160ce86c7SWei Liu /* 260ce86c7SWei Liu * Virtio 9p backend 360ce86c7SWei Liu * 460ce86c7SWei Liu * Copyright IBM, Corp. 2010 560ce86c7SWei Liu * 660ce86c7SWei Liu * Authors: 760ce86c7SWei Liu * Anthony Liguori <aliguori@us.ibm.com> 860ce86c7SWei Liu * 960ce86c7SWei Liu * This work is licensed under the terms of the GNU GPL, version 2. See 1060ce86c7SWei Liu * the COPYING file in the top-level directory. 1160ce86c7SWei Liu * 1260ce86c7SWei Liu */ 1360ce86c7SWei Liu 146f569084SChristian Schoenebeck /* 156f569084SChristian Schoenebeck * Not so fast! You might want to read the 9p developer docs first: 166f569084SChristian Schoenebeck * https://wiki.qemu.org/Documentation/9p 176f569084SChristian Schoenebeck */ 186f569084SChristian Schoenebeck 19fbc04127SPeter Maydell #include "qemu/osdep.h" 20a136d175SWill Cohen #ifdef CONFIG_LINUX 21a136d175SWill Cohen #include <linux/limits.h> 22a136d175SWill Cohen #endif 23e3e83f2eSGreg Kurz #include <glib/gprintf.h> 2460ce86c7SWei Liu #include "hw/virtio/virtio.h" 25da34e65cSMarkus Armbruster #include "qapi/error.h" 2660ce86c7SWei Liu #include "qemu/error-report.h" 2760ce86c7SWei Liu #include "qemu/iov.h" 28db725815SMarkus Armbruster #include "qemu/main-loop.h" 2960ce86c7SWei Liu #include "qemu/sockets.h" 3060ce86c7SWei Liu #include "virtio-9p.h" 3160ce86c7SWei Liu #include "fsdev/qemu-fsdev.h" 3260ce86c7SWei Liu #include "9p-xattr.h" 336b3b279bSKeno Fischer #include "9p-util.h" 3460ce86c7SWei Liu #include "coth.h" 3560ce86c7SWei Liu #include "trace.h" 36795c40b8SJuan Quintela #include "migration/blocker.h" 371a6ed33cSAntonios Motakis #include "qemu/xxhash.h" 386b6aa828SChristian Schoenebeck #include <math.h> 3960ce86c7SWei Liu 4060ce86c7SWei Liu int open_fd_hw; 4160ce86c7SWei Liu int total_open_fd; 4260ce86c7SWei Liu static int open_fd_rc; 4360ce86c7SWei Liu 4460ce86c7SWei Liu enum { 4560ce86c7SWei Liu Oread = 0x00, 4660ce86c7SWei Liu Owrite = 0x01, 4760ce86c7SWei Liu Ordwr = 0x02, 4860ce86c7SWei Liu Oexec = 0x03, 4960ce86c7SWei Liu Oexcl = 0x04, 5060ce86c7SWei Liu Otrunc = 0x10, 5160ce86c7SWei Liu Orexec = 0x20, 5260ce86c7SWei Liu Orclose = 0x40, 5360ce86c7SWei Liu Oappend = 0x80, 5460ce86c7SWei Liu }; 5560ce86c7SWei Liu 56cc82fde9SChristian Schoenebeck P9ARRAY_DEFINE_TYPE(V9fsPath, v9fs_path_free); 57cc82fde9SChristian Schoenebeck 5875673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 5960ce86c7SWei Liu { 6060ce86c7SWei Liu ssize_t ret; 6160ce86c7SWei Liu va_list ap; 6260ce86c7SWei Liu 6360ce86c7SWei Liu va_start(ap, fmt); 64ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 6560ce86c7SWei Liu va_end(ap); 6660ce86c7SWei Liu 6760ce86c7SWei Liu return ret; 6860ce86c7SWei Liu } 6960ce86c7SWei Liu 7075673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 7160ce86c7SWei Liu { 7260ce86c7SWei Liu ssize_t ret; 7360ce86c7SWei Liu va_list ap; 7460ce86c7SWei Liu 7560ce86c7SWei Liu va_start(ap, fmt); 76ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 7760ce86c7SWei Liu va_end(ap); 7860ce86c7SWei Liu 7960ce86c7SWei Liu return ret; 8060ce86c7SWei Liu } 8160ce86c7SWei Liu 8260ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 8360ce86c7SWei Liu { 8460ce86c7SWei Liu int ret = 0; 8560ce86c7SWei Liu 8660ce86c7SWei Liu switch (mode & 3) { 8760ce86c7SWei Liu case Oread: 8860ce86c7SWei Liu ret = O_RDONLY; 8960ce86c7SWei Liu break; 9060ce86c7SWei Liu case Ordwr: 9160ce86c7SWei Liu ret = O_RDWR; 9260ce86c7SWei Liu break; 9360ce86c7SWei Liu case Owrite: 9460ce86c7SWei Liu ret = O_WRONLY; 9560ce86c7SWei Liu break; 9660ce86c7SWei Liu case Oexec: 9760ce86c7SWei Liu ret = O_RDONLY; 9860ce86c7SWei Liu break; 9960ce86c7SWei Liu } 10060ce86c7SWei Liu 10160ce86c7SWei Liu if (mode & Otrunc) { 10260ce86c7SWei Liu ret |= O_TRUNC; 10360ce86c7SWei Liu } 10460ce86c7SWei Liu 10560ce86c7SWei Liu if (mode & Oappend) { 10660ce86c7SWei Liu ret |= O_APPEND; 10760ce86c7SWei Liu } 10860ce86c7SWei Liu 10960ce86c7SWei Liu if (mode & Oexcl) { 11060ce86c7SWei Liu ret |= O_EXCL; 11160ce86c7SWei Liu } 11260ce86c7SWei Liu 11360ce86c7SWei Liu return ret; 11460ce86c7SWei Liu } 11560ce86c7SWei Liu 1168e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 11760ce86c7SWei Liu int dotl_flag; 11860ce86c7SWei Liu int open_flag; 1198e71b96cSGreg Kurz } DotlOpenflagMap; 12060ce86c7SWei Liu 12160ce86c7SWei Liu static int dotl_to_open_flags(int flags) 12260ce86c7SWei Liu { 12360ce86c7SWei Liu int i; 12460ce86c7SWei Liu /* 12560ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 12660ce86c7SWei Liu * and P9_DOTL_NOACCESS 12760ce86c7SWei Liu */ 12860ce86c7SWei Liu int oflags = flags & O_ACCMODE; 12960ce86c7SWei Liu 1308e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 13160ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 13260ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 13360ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 13460ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 13560ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 13660ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 13760ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 13860ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 13967a71e3bSKeno Fischer #ifndef CONFIG_DARWIN 14067a71e3bSKeno Fischer { P9_DOTL_NOATIME, O_NOATIME }, 14167a71e3bSKeno Fischer /* 14267a71e3bSKeno Fischer * On Darwin, we could map to F_NOCACHE, which is 14367a71e3bSKeno Fischer * similar, but doesn't quite have the same 14467a71e3bSKeno Fischer * semantics. However, we don't support O_DIRECT 14567a71e3bSKeno Fischer * even on linux at the moment, so we just ignore 14667a71e3bSKeno Fischer * it here. 14767a71e3bSKeno Fischer */ 14860ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 14967a71e3bSKeno Fischer #endif 15060ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 15160ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 15260ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 15360ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 15460ce86c7SWei Liu }; 15560ce86c7SWei Liu 15660ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 15760ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 15860ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 15960ce86c7SWei Liu } 16060ce86c7SWei Liu } 16160ce86c7SWei Liu 16260ce86c7SWei Liu return oflags; 16360ce86c7SWei Liu } 16460ce86c7SWei Liu 16560ce86c7SWei Liu void cred_init(FsCred *credp) 16660ce86c7SWei Liu { 16760ce86c7SWei Liu credp->fc_uid = -1; 16860ce86c7SWei Liu credp->fc_gid = -1; 16960ce86c7SWei Liu credp->fc_mode = -1; 17060ce86c7SWei Liu credp->fc_rdev = -1; 17160ce86c7SWei Liu } 17260ce86c7SWei Liu 17360ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 17460ce86c7SWei Liu { 17560ce86c7SWei Liu int flags; 17660ce86c7SWei Liu /* 17760ce86c7SWei Liu * Filter the client open flags 17860ce86c7SWei Liu */ 17960ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 18060ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 18167a71e3bSKeno Fischer #ifndef CONFIG_DARWIN 18260ce86c7SWei Liu /* 18360ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 18460ce86c7SWei Liu */ 18560ce86c7SWei Liu flags &= ~O_DIRECT; 18667a71e3bSKeno Fischer #endif 18760ce86c7SWei Liu return flags; 18860ce86c7SWei Liu } 18960ce86c7SWei Liu 19060ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 19160ce86c7SWei Liu { 19260ce86c7SWei Liu path->data = NULL; 19360ce86c7SWei Liu path->size = 0; 19460ce86c7SWei Liu } 19560ce86c7SWei Liu 19660ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 19760ce86c7SWei Liu { 19860ce86c7SWei Liu g_free(path->data); 19960ce86c7SWei Liu path->data = NULL; 20060ce86c7SWei Liu path->size = 0; 20160ce86c7SWei Liu } 20260ce86c7SWei Liu 203e3e83f2eSGreg Kurz 2049edc6313SMarc-André Lureau void G_GNUC_PRINTF(2, 3) 205e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 206e3e83f2eSGreg Kurz { 207e3e83f2eSGreg Kurz va_list ap; 208e3e83f2eSGreg Kurz 209e3e83f2eSGreg Kurz v9fs_path_free(path); 210e3e83f2eSGreg Kurz 211e3e83f2eSGreg Kurz va_start(ap, fmt); 212e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 213e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 214e3e83f2eSGreg Kurz va_end(ap); 215e3e83f2eSGreg Kurz } 216e3e83f2eSGreg Kurz 217e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 21860ce86c7SWei Liu { 219e446a1ebSMarc-André Lureau v9fs_path_free(dst); 220e446a1ebSMarc-André Lureau dst->size = src->size; 221e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 22260ce86c7SWei Liu } 22360ce86c7SWei Liu 22460ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 22560ce86c7SWei Liu const char *name, V9fsPath *path) 22660ce86c7SWei Liu { 22760ce86c7SWei Liu int err; 22860ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 22960ce86c7SWei Liu if (err < 0) { 23060ce86c7SWei Liu err = -errno; 23160ce86c7SWei Liu } 23260ce86c7SWei Liu return err; 23360ce86c7SWei Liu } 23460ce86c7SWei Liu 23560ce86c7SWei Liu /* 23660ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 23760ce86c7SWei Liu * 23860ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 23960ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 24060ce86c7SWei Liu */ 24160ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 24260ce86c7SWei Liu { 24360ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 24460ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 24560ce86c7SWei Liu return 1; 24660ce86c7SWei Liu } 24760ce86c7SWei Liu } 24860ce86c7SWei Liu return 0; 24960ce86c7SWei Liu } 25060ce86c7SWei Liu 25160ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 25260ce86c7SWei Liu { 25360ce86c7SWei Liu return str->size; 25460ce86c7SWei Liu } 25560ce86c7SWei Liu 25660ce86c7SWei Liu /* 257f5265c8fSLinus Heckemann * returns 0 if fid got re-opened, 1 if not, < 0 on error 258f5265c8fSLinus Heckemann */ 2598440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 26060ce86c7SWei Liu { 26160ce86c7SWei Liu int err = 1; 26260ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 26360ce86c7SWei Liu if (f->fs.fd == -1) { 26460ce86c7SWei Liu do { 26560ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 26660ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 26760ce86c7SWei Liu } 26860ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 269f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 27060ce86c7SWei Liu do { 27160ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 27260ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 27360ce86c7SWei Liu } 27460ce86c7SWei Liu } 27560ce86c7SWei Liu return err; 27660ce86c7SWei Liu } 27760ce86c7SWei Liu 2788440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 27960ce86c7SWei Liu { 28060ce86c7SWei Liu int err; 28160ce86c7SWei Liu V9fsFidState *f; 28260ce86c7SWei Liu V9fsState *s = pdu->s; 28360ce86c7SWei Liu 284f5265c8fSLinus Heckemann f = g_hash_table_lookup(s->fids, GINT_TO_POINTER(fid)); 285f5265c8fSLinus Heckemann if (f) { 28660ce86c7SWei Liu BUG_ON(f->clunked); 28760ce86c7SWei Liu /* 28860ce86c7SWei Liu * Update the fid ref upfront so that 28960ce86c7SWei Liu * we don't get reclaimed when we yield 29060ce86c7SWei Liu * in open later. 29160ce86c7SWei Liu */ 29260ce86c7SWei Liu f->ref++; 29360ce86c7SWei Liu /* 29460ce86c7SWei Liu * check whether we need to reopen the 29560ce86c7SWei Liu * file. We might have closed the fd 29660ce86c7SWei Liu * while trying to free up some file 29760ce86c7SWei Liu * descriptors. 29860ce86c7SWei Liu */ 29960ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 30060ce86c7SWei Liu if (err < 0) { 30160ce86c7SWei Liu f->ref--; 30260ce86c7SWei Liu return NULL; 30360ce86c7SWei Liu } 30460ce86c7SWei Liu /* 30560ce86c7SWei Liu * Mark the fid as referenced so that the LRU 30660ce86c7SWei Liu * reclaim won't close the file descriptor 30760ce86c7SWei Liu */ 30860ce86c7SWei Liu f->flags |= FID_REFERENCED; 30960ce86c7SWei Liu return f; 31060ce86c7SWei Liu } 31160ce86c7SWei Liu return NULL; 31260ce86c7SWei Liu } 31360ce86c7SWei Liu 31460ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 31560ce86c7SWei Liu { 31660ce86c7SWei Liu V9fsFidState *f; 31760ce86c7SWei Liu 318f5265c8fSLinus Heckemann f = g_hash_table_lookup(s->fids, GINT_TO_POINTER(fid)); 319f5265c8fSLinus Heckemann if (f) { 32060ce86c7SWei Liu /* If fid is already there return NULL */ 32160ce86c7SWei Liu BUG_ON(f->clunked); 32260ce86c7SWei Liu return NULL; 32360ce86c7SWei Liu } 3241366244aSMarkus Armbruster f = g_new0(V9fsFidState, 1); 32560ce86c7SWei Liu f->fid = fid; 32660ce86c7SWei Liu f->fid_type = P9_FID_NONE; 32760ce86c7SWei Liu f->ref = 1; 32860ce86c7SWei Liu /* 32960ce86c7SWei Liu * Mark the fid as referenced so that the LRU 33060ce86c7SWei Liu * reclaim won't close the file descriptor 33160ce86c7SWei Liu */ 33260ce86c7SWei Liu f->flags |= FID_REFERENCED; 333f5265c8fSLinus Heckemann g_hash_table_insert(s->fids, GINT_TO_POINTER(fid), f); 33460ce86c7SWei Liu 335d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 336d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3377cde47d4SGreg Kurz 33860ce86c7SWei Liu return f; 33960ce86c7SWei Liu } 34060ce86c7SWei Liu 3418440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 34260ce86c7SWei Liu { 34360ce86c7SWei Liu int retval = 0; 34460ce86c7SWei Liu 345dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 34660ce86c7SWei Liu /* getxattr/listxattr fid */ 34760ce86c7SWei Liu goto free_value; 34860ce86c7SWei Liu } 34960ce86c7SWei Liu /* 35060ce86c7SWei Liu * if this is fid for setxattr. clunk should 35160ce86c7SWei Liu * result in setxattr localcall 35260ce86c7SWei Liu */ 35360ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 35460ce86c7SWei Liu /* clunk after partial write */ 35560ce86c7SWei Liu retval = -EINVAL; 35660ce86c7SWei Liu goto free_out; 35760ce86c7SWei Liu } 35860ce86c7SWei Liu if (fidp->fs.xattr.len) { 35960ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 36060ce86c7SWei Liu fidp->fs.xattr.value, 36160ce86c7SWei Liu fidp->fs.xattr.len, 36260ce86c7SWei Liu fidp->fs.xattr.flags); 36360ce86c7SWei Liu } else { 36460ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 36560ce86c7SWei Liu } 36660ce86c7SWei Liu free_out: 36760ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 36860ce86c7SWei Liu free_value: 36960ce86c7SWei Liu g_free(fidp->fs.xattr.value); 37060ce86c7SWei Liu return retval; 37160ce86c7SWei Liu } 37260ce86c7SWei Liu 3738440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 37460ce86c7SWei Liu { 37560ce86c7SWei Liu int retval = 0; 37660ce86c7SWei Liu 37760ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 37860ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 37960ce86c7SWei Liu if (fidp->fs.fd != -1) { 38060ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 38160ce86c7SWei Liu } 38260ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 383f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 38460ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 38560ce86c7SWei Liu } 38660ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 38760ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 38860ce86c7SWei Liu } 38960ce86c7SWei Liu v9fs_path_free(&fidp->path); 39060ce86c7SWei Liu g_free(fidp); 39160ce86c7SWei Liu return retval; 39260ce86c7SWei Liu } 39360ce86c7SWei Liu 3948440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 39560ce86c7SWei Liu { 39660ce86c7SWei Liu BUG_ON(!fidp->ref); 39760ce86c7SWei Liu fidp->ref--; 39860ce86c7SWei Liu /* 39960ce86c7SWei Liu * Don't free the fid if it is in reclaim list 40060ce86c7SWei Liu */ 40160ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 40260ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 40360ce86c7SWei Liu /* 40460ce86c7SWei Liu * if the clunked fid is root fid then we 40560ce86c7SWei Liu * have unmounted the fs on the client side. 40660ce86c7SWei Liu * delete the migration blocker. Ideally, this 40760ce86c7SWei Liu * should be hooked to transport close notification 40860ce86c7SWei Liu */ 40960ce86c7SWei Liu if (pdu->s->migration_blocker) { 41060ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 41160ce86c7SWei Liu error_free(pdu->s->migration_blocker); 41260ce86c7SWei Liu pdu->s->migration_blocker = NULL; 41360ce86c7SWei Liu } 41460ce86c7SWei Liu } 41560ce86c7SWei Liu return free_fid(pdu, fidp); 41660ce86c7SWei Liu } 41760ce86c7SWei Liu return 0; 41860ce86c7SWei Liu } 41960ce86c7SWei Liu 42060ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 42160ce86c7SWei Liu { 422feabd6cfSGreg Kurz V9fsFidState *fidp; 42360ce86c7SWei Liu 424f5265c8fSLinus Heckemann /* TODO: Use g_hash_table_steal_extended() instead? */ 425f5265c8fSLinus Heckemann fidp = g_hash_table_lookup(s->fids, GINT_TO_POINTER(fid)); 426f5265c8fSLinus Heckemann if (fidp) { 427f5265c8fSLinus Heckemann g_hash_table_remove(s->fids, GINT_TO_POINTER(fid)); 4282e53160fSGreg Kurz fidp->clunked = true; 42960ce86c7SWei Liu return fidp; 43060ce86c7SWei Liu } 431feabd6cfSGreg Kurz return NULL; 432feabd6cfSGreg Kurz } 43360ce86c7SWei Liu 4348440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 43560ce86c7SWei Liu { 43660ce86c7SWei Liu int reclaim_count = 0; 43760ce86c7SWei Liu V9fsState *s = pdu->s; 43881f9766bSGreg Kurz V9fsFidState *f; 439f5265c8fSLinus Heckemann GHashTableIter iter; 440f5265c8fSLinus Heckemann gpointer fid; 441f5265c8fSLinus Heckemann 442f5265c8fSLinus Heckemann g_hash_table_iter_init(&iter, s->fids); 443f5265c8fSLinus Heckemann 44481f9766bSGreg Kurz QSLIST_HEAD(, V9fsFidState) reclaim_list = 44581f9766bSGreg Kurz QSLIST_HEAD_INITIALIZER(reclaim_list); 44660ce86c7SWei Liu 447f5265c8fSLinus Heckemann while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &f)) { 44860ce86c7SWei Liu /* 44960ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 45060ce86c7SWei Liu * for them and skip them. Also skip fids 45160ce86c7SWei Liu * currently being operated on. 45260ce86c7SWei Liu */ 45360ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 45460ce86c7SWei Liu continue; 45560ce86c7SWei Liu } 45660ce86c7SWei Liu /* 45760ce86c7SWei Liu * if it is a recently referenced fid 45860ce86c7SWei Liu * we leave the fid untouched and clear the 45960ce86c7SWei Liu * reference bit. We come back to it later 46060ce86c7SWei Liu * in the next iteration. (a simple LRU without 46160ce86c7SWei Liu * moving list elements around) 46260ce86c7SWei Liu */ 46360ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 46460ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 46560ce86c7SWei Liu continue; 46660ce86c7SWei Liu } 46760ce86c7SWei Liu /* 46860ce86c7SWei Liu * Add fids to reclaim list. 46960ce86c7SWei Liu */ 47060ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 47160ce86c7SWei Liu if (f->fs.fd != -1) { 47260ce86c7SWei Liu /* 47360ce86c7SWei Liu * Up the reference count so that 47460ce86c7SWei Liu * a clunk request won't free this fid 47560ce86c7SWei Liu */ 47660ce86c7SWei Liu f->ref++; 47781f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 47860ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 47960ce86c7SWei Liu f->fs.fd = -1; 48060ce86c7SWei Liu reclaim_count++; 48160ce86c7SWei Liu } 48260ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 483f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 48460ce86c7SWei Liu /* 48560ce86c7SWei Liu * Up the reference count so that 48660ce86c7SWei Liu * a clunk request won't free this fid 48760ce86c7SWei Liu */ 48860ce86c7SWei Liu f->ref++; 48981f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 490f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 491f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 49260ce86c7SWei Liu reclaim_count++; 49360ce86c7SWei Liu } 49460ce86c7SWei Liu } 49560ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 49660ce86c7SWei Liu break; 49760ce86c7SWei Liu } 49860ce86c7SWei Liu } 49960ce86c7SWei Liu /* 50060ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 50160ce86c7SWei Liu * are already clunked. 50260ce86c7SWei Liu */ 50381f9766bSGreg Kurz while (!QSLIST_EMPTY(&reclaim_list)) { 50481f9766bSGreg Kurz f = QSLIST_FIRST(&reclaim_list); 50581f9766bSGreg Kurz QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); 50660ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 50760ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 50860ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 50960ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 51060ce86c7SWei Liu } 51160ce86c7SWei Liu /* 51260ce86c7SWei Liu * Now drop the fid reference, free it 51360ce86c7SWei Liu * if clunked. 51460ce86c7SWei Liu */ 51560ce86c7SWei Liu put_fid(pdu, f); 51660ce86c7SWei Liu } 51760ce86c7SWei Liu } 51860ce86c7SWei Liu 519f5265c8fSLinus Heckemann /* 520f5265c8fSLinus Heckemann * This is used when a path is removed from the directory tree. Any 521f5265c8fSLinus Heckemann * fids that still reference it must not be closed from then on, since 522f5265c8fSLinus Heckemann * they cannot be reopened. 523f5265c8fSLinus Heckemann */ 5248440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 52560ce86c7SWei Liu { 526f5265c8fSLinus Heckemann int err = 0; 52760ce86c7SWei Liu V9fsState *s = pdu->s; 528f5265c8fSLinus Heckemann V9fsFidState *fidp; 529f5265c8fSLinus Heckemann gpointer fid; 530f5265c8fSLinus Heckemann GHashTableIter iter; 531f5265c8fSLinus Heckemann /* 532f5265c8fSLinus Heckemann * The most common case is probably that we have exactly one 533f5265c8fSLinus Heckemann * fid for the given path, so preallocate exactly one. 534f5265c8fSLinus Heckemann */ 535f5265c8fSLinus Heckemann g_autoptr(GArray) to_reopen = g_array_sized_new(FALSE, FALSE, 536f5265c8fSLinus Heckemann sizeof(V9fsFidState *), 1); 537f5265c8fSLinus Heckemann gint i; 53860ce86c7SWei Liu 539f5265c8fSLinus Heckemann g_hash_table_iter_init(&iter, s->fids); 54020b7f45bSGreg Kurz 54120b7f45bSGreg Kurz /* 542f5265c8fSLinus Heckemann * We iterate over the fid table looking for the entries we need 543f5265c8fSLinus Heckemann * to reopen, and store them in to_reopen. This is because 544f5265c8fSLinus Heckemann * v9fs_reopen_fid() and put_fid() yield. This allows the fid table 545f5265c8fSLinus Heckemann * to be modified in the meantime, invalidating our iterator. 54620b7f45bSGreg Kurz */ 547f5265c8fSLinus Heckemann while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &fidp)) { 54820b7f45bSGreg Kurz if (fidp->path.size == path->size && 54920b7f45bSGreg Kurz !memcmp(fidp->path.data, path->data, path->size)) { 550f5265c8fSLinus Heckemann /* 551f5265c8fSLinus Heckemann * Ensure the fid survives a potential clunk request during 552f5265c8fSLinus Heckemann * v9fs_reopen_fid or put_fid. 553f5265c8fSLinus Heckemann */ 554f5265c8fSLinus Heckemann fidp->ref++; 55560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 556f5265c8fSLinus Heckemann g_array_append_val(to_reopen, fidp); 557f5265c8fSLinus Heckemann } 558f5265c8fSLinus Heckemann } 55960ce86c7SWei Liu 560f5265c8fSLinus Heckemann for (i = 0; i < to_reopen->len; i++) { 561f5265c8fSLinus Heckemann fidp = g_array_index(to_reopen, V9fsFidState*, i); 56260ce86c7SWei Liu /* reopen the file/dir if already closed */ 56360ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 56460ce86c7SWei Liu if (err < 0) { 565f5265c8fSLinus Heckemann break; 566f5265c8fSLinus Heckemann } 567f5265c8fSLinus Heckemann } 568f5265c8fSLinus Heckemann 569f5265c8fSLinus Heckemann for (i = 0; i < to_reopen->len; i++) { 570f5265c8fSLinus Heckemann put_fid(pdu, g_array_index(to_reopen, V9fsFidState*, i)); 571f5265c8fSLinus Heckemann } 572267fcadfSGreg Kurz return err; 57360ce86c7SWei Liu } 57460ce86c7SWei Liu 5758440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 57660ce86c7SWei Liu { 57760ce86c7SWei Liu V9fsState *s = pdu->s; 57879decce3SGreg Kurz V9fsFidState *fidp; 579f5265c8fSLinus Heckemann GList *freeing; 580f5265c8fSLinus Heckemann /* 581f5265c8fSLinus Heckemann * Get a list of all the values (fid states) in the table, which 582f5265c8fSLinus Heckemann * we then... 583f5265c8fSLinus Heckemann */ 584f5265c8fSLinus Heckemann g_autoptr(GList) fids = g_hash_table_get_values(s->fids); 58560ce86c7SWei Liu 586f5265c8fSLinus Heckemann /* ... remove from the table, taking over ownership. */ 587f5265c8fSLinus Heckemann g_hash_table_steal_all(s->fids); 588f5265c8fSLinus Heckemann 589f5265c8fSLinus Heckemann /* 590f5265c8fSLinus Heckemann * This allows us to release our references to them asynchronously without 591f5265c8fSLinus Heckemann * iterating over the hash table and risking iterator invalidation 592f5265c8fSLinus Heckemann * through concurrent modifications. 593f5265c8fSLinus Heckemann */ 594f5265c8fSLinus Heckemann for (freeing = fids; freeing; freeing = freeing->next) { 595f5265c8fSLinus Heckemann fidp = freeing->data; 5966d54af0eSGreg Kurz fidp->ref++; 5972e53160fSGreg Kurz fidp->clunked = true; 5986d54af0eSGreg Kurz put_fid(pdu, fidp); 59960ce86c7SWei Liu } 60060ce86c7SWei Liu } 60160ce86c7SWei Liu 60260ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 60360ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 60460ce86c7SWei Liu 60560ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 60660ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 60760ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 60860ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 60960ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 61060ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 61160ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 61260ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 61360ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 61460ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 61560ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 61660ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 61760ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 61860ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 61960ce86c7SWei Liu 62060ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 62160ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 62260ce86c7SWei Liu P9_STAT_MODE_LINK | \ 62360ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 62460ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 62560ce86c7SWei Liu P9_STAT_MODE_SOCKET) 62660ce86c7SWei Liu 6276b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 6286b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 6296b6aa828SChristian Schoenebeck { 6306b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 6316b6aa828SChristian Schoenebeck } 6326b6aa828SChristian Schoenebeck 6336b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 6346b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 6356b6aa828SChristian Schoenebeck { 6366b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 6376b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 6386b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 6396b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 6406b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 6416b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 6426b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 6436b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 6446b6aa828SChristian Schoenebeck } 6456b6aa828SChristian Schoenebeck 646e16fea41SChristian Schoenebeck /* 647e16fea41SChristian Schoenebeck * Parameter k for the Exponential Golomb algorihm to be used. 6486b6aa828SChristian Schoenebeck * 6496b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6506b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6516b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6526b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6536b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6546b6aa828SChristian Schoenebeck * 6556b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6566b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6576b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6586b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6596b6aa828SChristian Schoenebeck * 660e16fea41SChristian Schoenebeck * IMPORTANT: In case this ever becomes a runtime parameter; the value of 6616b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6626b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6636b6aa828SChristian Schoenebeck */ 6646b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6656b6aa828SChristian Schoenebeck 6666b6aa828SChristian Schoenebeck /** 667e16fea41SChristian Schoenebeck * expGolombEncode() - Exponential Golomb algorithm for arbitrary k 668e16fea41SChristian Schoenebeck * (including k=0). 6696b6aa828SChristian Schoenebeck * 670e16fea41SChristian Schoenebeck * @n: natural number (or index) of the prefix to be generated 671e16fea41SChristian Schoenebeck * (1, 2, 3, ...) 672e16fea41SChristian Schoenebeck * @k: parameter k of Exp. Golomb algorithm to be used 673e16fea41SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 674e16fea41SChristian Schoenebeck * Return: prefix for given @n and @k 675e16fea41SChristian Schoenebeck * 676e16fea41SChristian Schoenebeck * The Exponential Golomb algorithm generates prefixes (NOT suffixes!) 6776b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6786b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6796b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6806b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6816b6aa828SChristian Schoenebeck * 6826b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 683e16fea41SChristian Schoenebeck * sense that lowest allowed index (@n) starts with 1, not with zero. 6846b6aa828SChristian Schoenebeck */ 6856b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6866b6aa828SChristian Schoenebeck { 6876b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6886b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6896b6aa828SChristian Schoenebeck return (VariLenAffix) { 6906b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6916b6aa828SChristian Schoenebeck .value = value, 6926b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6936b6aa828SChristian Schoenebeck }; 6946b6aa828SChristian Schoenebeck } 6956b6aa828SChristian Schoenebeck 6966b6aa828SChristian Schoenebeck /** 697e16fea41SChristian Schoenebeck * invertAffix() - Converts a suffix into a prefix, or a prefix into a suffix. 698e16fea41SChristian Schoenebeck * @affix: either suffix or prefix to be inverted 699e16fea41SChristian Schoenebeck * Return: inversion of passed @affix 7006b6aa828SChristian Schoenebeck * 7016b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 7026b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 7036b6aa828SChristian Schoenebeck * after the conversion. 7046b6aa828SChristian Schoenebeck * 7056b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 7066b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 7076b6aa828SChristian Schoenebeck * versa). 7086b6aa828SChristian Schoenebeck */ 7096b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 7106b6aa828SChristian Schoenebeck { 7116b6aa828SChristian Schoenebeck return (VariLenAffix) { 7126b6aa828SChristian Schoenebeck .type = 7136b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 7146b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 7156b6aa828SChristian Schoenebeck .value = 7166b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 7176b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 7186b6aa828SChristian Schoenebeck .bits = affix->bits 7196b6aa828SChristian Schoenebeck }; 7206b6aa828SChristian Schoenebeck } 7216b6aa828SChristian Schoenebeck 7226b6aa828SChristian Schoenebeck /** 723e16fea41SChristian Schoenebeck * affixForIndex() - Generates suffix numbers with "suffix-free" property. 724e16fea41SChristian Schoenebeck * @index: natural number (or index) of the suffix to be generated 725e16fea41SChristian Schoenebeck * (1, 2, 3, ...) 726e16fea41SChristian Schoenebeck * Return: Suffix suitable to assemble unique number. 7276b6aa828SChristian Schoenebeck * 7286b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 7296b6aa828SChristian Schoenebeck * 7306b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 7316b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 7326b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 7336b6aa828SChristian Schoenebeck */ 7346b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 7356b6aa828SChristian Schoenebeck { 7366b6aa828SChristian Schoenebeck VariLenAffix prefix; 7376b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 7386b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 7396b6aa828SChristian Schoenebeck } 7406b6aa828SChristian Schoenebeck 7411a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 7421a6ed33cSAntonios Motakis { 743*80106bc5SAlex Bennée return qemu_xxhash4(e.ino_prefix, e.dev); 7441a6ed33cSAntonios Motakis } 7451a6ed33cSAntonios Motakis 746f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 747f3fe4a2dSAntonios Motakis { 748*80106bc5SAlex Bennée return qemu_xxhash4(e.ino, e.dev); 749f3fe4a2dSAntonios Motakis } 750f3fe4a2dSAntonios Motakis 7516b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7526b6aa828SChristian Schoenebeck { 7536b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7546b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7556b6aa828SChristian Schoenebeck } 7566b6aa828SChristian Schoenebeck 7576b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7581a6ed33cSAntonios Motakis { 7591a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7601a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7611a6ed33cSAntonios Motakis } 7621a6ed33cSAntonios Motakis 7636b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 764f3fe4a2dSAntonios Motakis { 765f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 766f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 767f3fe4a2dSAntonios Motakis } 768f3fe4a2dSAntonios Motakis 769f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7701a6ed33cSAntonios Motakis { 7711a6ed33cSAntonios Motakis g_free(p); 7721a6ed33cSAntonios Motakis } 7731a6ed33cSAntonios Motakis 774f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7751a6ed33cSAntonios Motakis { 7761a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7771a6ed33cSAntonios Motakis return; 7781a6ed33cSAntonios Motakis } 779f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7801a6ed33cSAntonios Motakis qht_destroy(ht); 7811a6ed33cSAntonios Motakis } 7821a6ed33cSAntonios Motakis 7836b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7846b6aa828SChristian Schoenebeck { 7856b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7866b6aa828SChristian Schoenebeck } 7876b6aa828SChristian Schoenebeck 7881a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7891a6ed33cSAntonios Motakis { 7906b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7911a6ed33cSAntonios Motakis } 7921a6ed33cSAntonios Motakis 793f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 794f3fe4a2dSAntonios Motakis { 7956b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 796f3fe4a2dSAntonios Motakis } 797f3fe4a2dSAntonios Motakis 7986b6aa828SChristian Schoenebeck /* 7996b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 8006b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 8016b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 8026b6aa828SChristian Schoenebeck * 8036b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 8046b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 8056b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 8066b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 8076b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 8086b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 8096b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 8106b6aa828SChristian Schoenebeck */ 8116b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 8126b6aa828SChristian Schoenebeck { 8136b6aa828SChristian Schoenebeck QpdEntry lookup = { 8146b6aa828SChristian Schoenebeck .dev = dev 8156b6aa828SChristian Schoenebeck }, *val; 8166b6aa828SChristian Schoenebeck uint32_t hash = dev; 8176b6aa828SChristian Schoenebeck VariLenAffix affix; 8186b6aa828SChristian Schoenebeck 8196b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 8206b6aa828SChristian Schoenebeck if (!val) { 8211366244aSMarkus Armbruster val = g_new0(QpdEntry, 1); 8226b6aa828SChristian Schoenebeck *val = lookup; 8236b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 8246b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 8256b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 8266b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 8276b6aa828SChristian Schoenebeck } 8286b6aa828SChristian Schoenebeck return val->prefix_bits; 8296b6aa828SChristian Schoenebeck } 8306b6aa828SChristian Schoenebeck 831e16fea41SChristian Schoenebeck /* 832e16fea41SChristian Schoenebeck * Slow / full mapping host inode nr -> guest inode nr. 8336b6aa828SChristian Schoenebeck * 8346b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 8356b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 8366b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 8376b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 8386b6aa828SChristian Schoenebeck * guest. 8396b6aa828SChristian Schoenebeck * 8406b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 8416b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 8426b6aa828SChristian Schoenebeck * expected ever to be used at all though. 8436b6aa828SChristian Schoenebeck * 844e16fea41SChristian Schoenebeck * See qid_path_suffixmap() for details 8456b6aa828SChristian Schoenebeck * 8466b6aa828SChristian Schoenebeck */ 847f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 848f3fe4a2dSAntonios Motakis uint64_t *path) 849f3fe4a2dSAntonios Motakis { 850f3fe4a2dSAntonios Motakis QpfEntry lookup = { 851f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 852f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 853f3fe4a2dSAntonios Motakis }, *val; 854f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8556b6aa828SChristian Schoenebeck VariLenAffix affix; 856f3fe4a2dSAntonios Motakis 857f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 858f3fe4a2dSAntonios Motakis 859f3fe4a2dSAntonios Motakis if (!val) { 860f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 861f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 862f3fe4a2dSAntonios Motakis error_report_once( 863f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 864f3fe4a2dSAntonios Motakis "host to guest." 865f3fe4a2dSAntonios Motakis ); 866f3fe4a2dSAntonios Motakis return -ENFILE; 867f3fe4a2dSAntonios Motakis } 868f3fe4a2dSAntonios Motakis 8691366244aSMarkus Armbruster val = g_new0(QpfEntry, 1); 870f3fe4a2dSAntonios Motakis *val = lookup; 871f3fe4a2dSAntonios Motakis 872f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8736b6aa828SChristian Schoenebeck affix = affixForIndex( 8746b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8756b6aa828SChristian Schoenebeck ); 8766b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8776b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 878f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 879f3fe4a2dSAntonios Motakis } 880f3fe4a2dSAntonios Motakis 881f3fe4a2dSAntonios Motakis *path = val->path; 882f3fe4a2dSAntonios Motakis return 0; 883f3fe4a2dSAntonios Motakis } 884f3fe4a2dSAntonios Motakis 885e16fea41SChristian Schoenebeck /* 886e16fea41SChristian Schoenebeck * Quick mapping host inode nr -> guest inode nr. 8871a6ed33cSAntonios Motakis * 8886b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8896b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8906b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8916b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8926b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8936b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8946b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8956b6aa828SChristian Schoenebeck * that is). 8966b6aa828SChristian Schoenebeck * 8976b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8986b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8996b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 9006b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 9016b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 9026b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 9036b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 9046b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 9056b6aa828SChristian Schoenebeck * 9066b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 9076b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 9086b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 9096b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 9106b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 9116b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 9126b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 9136b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 9146b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 9156b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 9166b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 9176b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 9186b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 9196b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 9206b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 9216b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 9226b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 9231a6ed33cSAntonios Motakis */ 9246b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 9251a6ed33cSAntonios Motakis uint64_t *path) 9261a6ed33cSAntonios Motakis { 9276b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 9281a6ed33cSAntonios Motakis QppEntry lookup = { 9291a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 9306b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 9311a6ed33cSAntonios Motakis }, *val; 9321a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 9331a6ed33cSAntonios Motakis 9341a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 9351a6ed33cSAntonios Motakis 9361a6ed33cSAntonios Motakis if (!val) { 9376b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 9386b6aa828SChristian Schoenebeck /* we ran out of affixes */ 939f3fe4a2dSAntonios Motakis warn_report_once( 940f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 9411a6ed33cSAntonios Motakis ); 9421a6ed33cSAntonios Motakis return -ENFILE; 9431a6ed33cSAntonios Motakis } 9441a6ed33cSAntonios Motakis 9451366244aSMarkus Armbruster val = g_new0(QppEntry, 1); 9461a6ed33cSAntonios Motakis *val = lookup; 9471a6ed33cSAntonios Motakis 9486b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 9496b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 9506b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 9511a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9521a6ed33cSAntonios Motakis } 9536b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9546b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9551a6ed33cSAntonios Motakis return 0; 9561a6ed33cSAntonios Motakis } 9571a6ed33cSAntonios Motakis 9583b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 95960ce86c7SWei Liu { 9601a6ed33cSAntonios Motakis int err; 96160ce86c7SWei Liu size_t size; 96260ce86c7SWei Liu 9631a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9641a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9656b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 966f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 967f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 968f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 969f3fe4a2dSAntonios Motakis } 9701a6ed33cSAntonios Motakis if (err) { 9711a6ed33cSAntonios Motakis return err; 9721a6ed33cSAntonios Motakis } 9731a6ed33cSAntonios Motakis } else { 9743b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9751a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9761a6ed33cSAntonios Motakis error_report_once( 9771a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9781a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9791a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9801a6ed33cSAntonios Motakis "effective." 9811a6ed33cSAntonios Motakis ); 9821a6ed33cSAntonios Motakis return -ENODEV; 9831a6ed33cSAntonios Motakis } else { 9843b5ee9e8SAntonios Motakis warn_report_once( 9853b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9863b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9871a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9881a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9891a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9903b5ee9e8SAntonios Motakis ); 9913b5ee9e8SAntonios Motakis } 9921a6ed33cSAntonios Motakis } 99360ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 99460ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 99560ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9961a6ed33cSAntonios Motakis } 9971a6ed33cSAntonios Motakis 99860ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 99960ce86c7SWei Liu qidp->type = 0; 100060ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 100160ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 100260ce86c7SWei Liu } 100360ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 100460ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 100560ce86c7SWei Liu } 10063b5ee9e8SAntonios Motakis 10073b5ee9e8SAntonios Motakis return 0; 100860ce86c7SWei Liu } 100960ce86c7SWei Liu 101060ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 101160ce86c7SWei Liu { 101260ce86c7SWei Liu V9fsPDU *pdu = NULL; 101360ce86c7SWei Liu 101460ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 101560ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 101660ce86c7SWei Liu QLIST_REMOVE(pdu, next); 101760ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 101860ce86c7SWei Liu } 101960ce86c7SWei Liu return pdu; 102060ce86c7SWei Liu } 102160ce86c7SWei Liu 102260ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 102360ce86c7SWei Liu { 102460ce86c7SWei Liu V9fsState *s = pdu->s; 1025f74e27bfSGreg Kurz 1026f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 102760ce86c7SWei Liu QLIST_REMOVE(pdu, next); 102860ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 102960ce86c7SWei Liu } 103060ce86c7SWei Liu 10318440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 103260ce86c7SWei Liu { 103360ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 103460ce86c7SWei Liu V9fsState *s = pdu->s; 103506a37db7SGreg Kurz int ret; 103660ce86c7SWei Liu 1037fc78d5eeSKeno Fischer /* 1038fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1039fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1040fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1041fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1042fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1043fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1044fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1045fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1046fc78d5eeSKeno Fischer * transmission of the reply. 1047fc78d5eeSKeno Fischer */ 1048fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1049fc78d5eeSKeno Fischer if (discard) { 1050fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1051fc78d5eeSKeno Fischer pdu->size = 0; 1052fc78d5eeSKeno Fischer goto out_notify; 1053fc78d5eeSKeno Fischer } 1054fc78d5eeSKeno Fischer 105560ce86c7SWei Liu if (len < 0) { 105660ce86c7SWei Liu int err = -len; 105760ce86c7SWei Liu len = 7; 105860ce86c7SWei Liu 105960ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 106060ce86c7SWei Liu V9fsString str; 106160ce86c7SWei Liu 106260ce86c7SWei Liu str.data = strerror(err); 106360ce86c7SWei Liu str.size = strlen(str.data); 106460ce86c7SWei Liu 106506a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 106606a37db7SGreg Kurz if (ret < 0) { 106706a37db7SGreg Kurz goto out_notify; 106806a37db7SGreg Kurz } 106906a37db7SGreg Kurz len += ret; 107060ce86c7SWei Liu id = P9_RERROR; 1071951fe2f8SChristian Schoenebeck } else { 1072951fe2f8SChristian Schoenebeck err = errno_to_dotl(err); 107360ce86c7SWei Liu } 107460ce86c7SWei Liu 107506a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 107606a37db7SGreg Kurz if (ret < 0) { 107706a37db7SGreg Kurz goto out_notify; 107806a37db7SGreg Kurz } 107906a37db7SGreg Kurz len += ret; 108060ce86c7SWei Liu 108160ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 108260ce86c7SWei Liu id = P9_RLERROR; 108360ce86c7SWei Liu } 108460ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 108560ce86c7SWei Liu } 108660ce86c7SWei Liu 108760ce86c7SWei Liu /* fill out the header */ 108806a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 108906a37db7SGreg Kurz goto out_notify; 109006a37db7SGreg Kurz } 109160ce86c7SWei Liu 109260ce86c7SWei Liu /* keep these in sync */ 109360ce86c7SWei Liu pdu->size = len; 109460ce86c7SWei Liu pdu->id = id; 109560ce86c7SWei Liu 109606a37db7SGreg Kurz out_notify: 1097a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 109860ce86c7SWei Liu 109960ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1100f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 110160ce86c7SWei Liu pdu_free(pdu); 110260ce86c7SWei Liu } 1103f74e27bfSGreg Kurz } 110460ce86c7SWei Liu 110560ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 110660ce86c7SWei Liu { 110760ce86c7SWei Liu mode_t ret; 110860ce86c7SWei Liu 110960ce86c7SWei Liu ret = mode & 0777; 111060ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 111160ce86c7SWei Liu ret |= S_IFDIR; 111260ce86c7SWei Liu } 111360ce86c7SWei Liu 111460ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 111560ce86c7SWei Liu ret |= S_IFLNK; 111660ce86c7SWei Liu } 111760ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 111860ce86c7SWei Liu ret |= S_IFSOCK; 111960ce86c7SWei Liu } 112060ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 112160ce86c7SWei Liu ret |= S_IFIFO; 112260ce86c7SWei Liu } 112360ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 112460ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 112560ce86c7SWei Liu ret |= S_IFCHR; 112660ce86c7SWei Liu } else { 112760ce86c7SWei Liu ret |= S_IFBLK; 112860ce86c7SWei Liu } 112960ce86c7SWei Liu } 113060ce86c7SWei Liu 113160ce86c7SWei Liu if (!(ret & ~0777)) { 113260ce86c7SWei Liu ret |= S_IFREG; 113360ce86c7SWei Liu } 113460ce86c7SWei Liu 113560ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 113660ce86c7SWei Liu ret |= S_ISUID; 113760ce86c7SWei Liu } 113860ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 113960ce86c7SWei Liu ret |= S_ISGID; 114060ce86c7SWei Liu } 114160ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 114260ce86c7SWei Liu ret |= S_ISVTX; 114360ce86c7SWei Liu } 114460ce86c7SWei Liu 114560ce86c7SWei Liu return ret; 114660ce86c7SWei Liu } 114760ce86c7SWei Liu 114860ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 114960ce86c7SWei Liu { 115060ce86c7SWei Liu if (stat->type == -1 && 115160ce86c7SWei Liu stat->dev == -1 && 115287032833SAntonios Motakis stat->qid.type == 0xff && 115387032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 115487032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 115560ce86c7SWei Liu stat->mode == -1 && 115660ce86c7SWei Liu stat->atime == -1 && 115760ce86c7SWei Liu stat->mtime == -1 && 115860ce86c7SWei Liu stat->length == -1 && 115960ce86c7SWei Liu !stat->name.size && 116060ce86c7SWei Liu !stat->uid.size && 116160ce86c7SWei Liu !stat->gid.size && 116260ce86c7SWei Liu !stat->muid.size && 116360ce86c7SWei Liu stat->n_uid == -1 && 116460ce86c7SWei Liu stat->n_gid == -1 && 116560ce86c7SWei Liu stat->n_muid == -1) { 116660ce86c7SWei Liu return 1; 116760ce86c7SWei Liu } 116860ce86c7SWei Liu 116960ce86c7SWei Liu return 0; 117060ce86c7SWei Liu } 117160ce86c7SWei Liu 117260ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 117360ce86c7SWei Liu { 117460ce86c7SWei Liu v9fs_string_init(&stat->name); 117560ce86c7SWei Liu v9fs_string_init(&stat->uid); 117660ce86c7SWei Liu v9fs_string_init(&stat->gid); 117760ce86c7SWei Liu v9fs_string_init(&stat->muid); 117860ce86c7SWei Liu v9fs_string_init(&stat->extension); 117960ce86c7SWei Liu } 118060ce86c7SWei Liu 118160ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 118260ce86c7SWei Liu { 118360ce86c7SWei Liu v9fs_string_free(&stat->name); 118460ce86c7SWei Liu v9fs_string_free(&stat->uid); 118560ce86c7SWei Liu v9fs_string_free(&stat->gid); 118660ce86c7SWei Liu v9fs_string_free(&stat->muid); 118760ce86c7SWei Liu v9fs_string_free(&stat->extension); 118860ce86c7SWei Liu } 118960ce86c7SWei Liu 119060ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 119160ce86c7SWei Liu { 119260ce86c7SWei Liu uint32_t mode; 119360ce86c7SWei Liu 119460ce86c7SWei Liu mode = stbuf->st_mode & 0777; 119560ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 119660ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 119760ce86c7SWei Liu } 119860ce86c7SWei Liu 119960ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 120060ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 120160ce86c7SWei Liu } 120260ce86c7SWei Liu 120360ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 120460ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 120560ce86c7SWei Liu } 120660ce86c7SWei Liu 120760ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 120860ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 120960ce86c7SWei Liu } 121060ce86c7SWei Liu 121160ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 121260ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 121360ce86c7SWei Liu } 121460ce86c7SWei Liu 121560ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 121660ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 121760ce86c7SWei Liu } 121860ce86c7SWei Liu 121960ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 122060ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 122160ce86c7SWei Liu } 122260ce86c7SWei Liu 122360ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 122460ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 122560ce86c7SWei Liu } 122660ce86c7SWei Liu 122760ce86c7SWei Liu return mode; 122860ce86c7SWei Liu } 122960ce86c7SWei Liu 12306069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 12316069537fSJan Dakinevich const char *basename, 123260ce86c7SWei Liu const struct stat *stbuf, 123360ce86c7SWei Liu V9fsStat *v9stat) 123460ce86c7SWei Liu { 123560ce86c7SWei Liu int err; 123660ce86c7SWei Liu 123760ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 123860ce86c7SWei Liu 12393b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12403b5ee9e8SAntonios Motakis if (err < 0) { 12413b5ee9e8SAntonios Motakis return err; 12423b5ee9e8SAntonios Motakis } 124360ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 124460ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 124560ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 124660ce86c7SWei Liu v9stat->length = stbuf->st_size; 124760ce86c7SWei Liu 1248abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1249abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1250abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 125160ce86c7SWei Liu 125260ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 125360ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 125460ce86c7SWei Liu v9stat->n_muid = 0; 125560ce86c7SWei Liu 1256abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 125760ce86c7SWei Liu 125860ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12596069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 126060ce86c7SWei Liu if (err < 0) { 126160ce86c7SWei Liu return err; 126260ce86c7SWei Liu } 126360ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 126460ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 126560ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 126660ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 126760ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 126860ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 126960ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 127060ce86c7SWei Liu } 127160ce86c7SWei Liu 12726069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 127360ce86c7SWei Liu 127460ce86c7SWei Liu v9stat->size = 61 + 127560ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 127660ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 127760ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 127860ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 127960ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 128060ce86c7SWei Liu return 0; 128160ce86c7SWei Liu } 128260ce86c7SWei Liu 128360ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 128460ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 128560ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 128660ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 128760ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 128860ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 128960ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 129060ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 129160ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 129260ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 129360ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 129460ce86c7SWei Liu 129560ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 129660ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 129760ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 129860ce86c7SWei Liu 129960ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 130060ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 130160ce86c7SWei Liu 130260ce86c7SWei Liu 1303b565bccbSChristian Schoenebeck /** 1304e16fea41SChristian Schoenebeck * blksize_to_iounit() - Block size exposed to 9p client. 1305e16fea41SChristian Schoenebeck * Return: block size 1306b565bccbSChristian Schoenebeck * 1307b565bccbSChristian Schoenebeck * @pdu: 9p client request 1308b565bccbSChristian Schoenebeck * @blksize: host filesystem's block size 1309e16fea41SChristian Schoenebeck * 1310e16fea41SChristian Schoenebeck * Convert host filesystem's block size into an appropriate block size for 1311e16fea41SChristian Schoenebeck * 9p client (guest OS side). The value returned suggests an "optimum" block 1312e16fea41SChristian Schoenebeck * size for 9p I/O, i.e. to maximize performance. 1313b565bccbSChristian Schoenebeck */ 1314b565bccbSChristian Schoenebeck static int32_t blksize_to_iounit(const V9fsPDU *pdu, int32_t blksize) 1315669ced09SChristian Schoenebeck { 1316669ced09SChristian Schoenebeck int32_t iounit = 0; 1317669ced09SChristian Schoenebeck V9fsState *s = pdu->s; 1318669ced09SChristian Schoenebeck 1319669ced09SChristian Schoenebeck /* 1320b565bccbSChristian Schoenebeck * iounit should be multiples of blksize (host filesystem block size) 1321669ced09SChristian Schoenebeck * as well as less than (client msize - P9_IOHDRSZ) 1322669ced09SChristian Schoenebeck */ 1323b565bccbSChristian Schoenebeck if (blksize) { 132404a7f9e5SChristian Schoenebeck iounit = QEMU_ALIGN_DOWN(s->msize - P9_IOHDRSZ, blksize); 1325669ced09SChristian Schoenebeck } 1326669ced09SChristian Schoenebeck if (!iounit) { 1327669ced09SChristian Schoenebeck iounit = s->msize - P9_IOHDRSZ; 1328669ced09SChristian Schoenebeck } 1329669ced09SChristian Schoenebeck return iounit; 1330669ced09SChristian Schoenebeck } 1331669ced09SChristian Schoenebeck 1332b565bccbSChristian Schoenebeck static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf) 1333b565bccbSChristian Schoenebeck { 1334b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, stbuf->st_blksize); 1335b565bccbSChristian Schoenebeck } 1336b565bccbSChristian Schoenebeck 13373b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 133860ce86c7SWei Liu V9fsStatDotl *v9lstat) 133960ce86c7SWei Liu { 134060ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 134160ce86c7SWei Liu 134260ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 134360ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 134460ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 134560ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 1346e5c88e22SChristian Schoenebeck v9lstat->st_rdev = host_dev_to_dotl_dev(stbuf->st_rdev); 134760ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 1348669ced09SChristian Schoenebeck v9lstat->st_blksize = stat_to_iounit(pdu, stbuf); 134960ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 135060ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 135160ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 135260ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 1353f41db099SKeno Fischer #ifdef CONFIG_DARWIN 1354f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atimespec.tv_nsec; 1355f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtimespec.tv_nsec; 1356f41db099SKeno Fischer v9lstat->st_ctime_nsec = stbuf->st_ctimespec.tv_nsec; 1357f41db099SKeno Fischer #else 1358f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 1359f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 136060ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 1361f41db099SKeno Fischer #endif 136260ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 136360ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 136460ce86c7SWei Liu 13653b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 136660ce86c7SWei Liu } 136760ce86c7SWei Liu 136860ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 136960ce86c7SWei Liu { 137060ce86c7SWei Liu int i; 137160ce86c7SWei Liu 137260ce86c7SWei Liu printf("sg[%d]: {", cnt); 137360ce86c7SWei Liu for (i = 0; i < cnt; i++) { 137460ce86c7SWei Liu if (i) { 137560ce86c7SWei Liu printf(", "); 137660ce86c7SWei Liu } 137760ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 137860ce86c7SWei Liu } 137960ce86c7SWei Liu printf("}\n"); 138060ce86c7SWei Liu } 138160ce86c7SWei Liu 138260ce86c7SWei Liu /* Will call this only for path name based fid */ 138360ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 138460ce86c7SWei Liu { 138560ce86c7SWei Liu V9fsPath str; 138660ce86c7SWei Liu v9fs_path_init(&str); 138760ce86c7SWei Liu v9fs_path_copy(&str, dst); 1388e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 138960ce86c7SWei Liu v9fs_path_free(&str); 139060ce86c7SWei Liu } 139160ce86c7SWei Liu 139260ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 139360ce86c7SWei Liu { 139460ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 139560ce86c7SWei Liu } 139660ce86c7SWei Liu 13978440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 139860ce86c7SWei Liu { 139960ce86c7SWei Liu ssize_t err; 140060ce86c7SWei Liu V9fsPDU *pdu = opaque; 140160ce86c7SWei Liu V9fsState *s = pdu->s; 140260ce86c7SWei Liu V9fsString version; 140360ce86c7SWei Liu size_t offset = 7; 140460ce86c7SWei Liu 140560ce86c7SWei Liu v9fs_string_init(&version); 140660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 140760ce86c7SWei Liu if (err < 0) { 140860ce86c7SWei Liu goto out; 140960ce86c7SWei Liu } 141060ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 141160ce86c7SWei Liu 141260ce86c7SWei Liu virtfs_reset(pdu); 141360ce86c7SWei Liu 141460ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 141560ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 141660ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 141760ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 141860ce86c7SWei Liu } else { 141960ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1420e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1421e16453a3SChristian Schoenebeck goto marshal; 142260ce86c7SWei Liu } 142360ce86c7SWei Liu 1424e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1425e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1426e16453a3SChristian Schoenebeck error_report( 1427e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1428e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1429e16453a3SChristian Schoenebeck ); 1430e16453a3SChristian Schoenebeck goto out; 1431e16453a3SChristian Schoenebeck } 1432e16453a3SChristian Schoenebeck 143362777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1434c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 143562777d82SChristian Schoenebeck warn_report_once( 143662777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 143762777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 143862777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 143962777d82SChristian Schoenebeck ); 144062777d82SChristian Schoenebeck } 144162777d82SChristian Schoenebeck 1442e16453a3SChristian Schoenebeck marshal: 144360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 144460ce86c7SWei Liu if (err < 0) { 144560ce86c7SWei Liu goto out; 144660ce86c7SWei Liu } 1447403a905bSPhilippe Mathieu-Daudé err += offset; 144860ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 144960ce86c7SWei Liu out: 1450403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 145160ce86c7SWei Liu v9fs_string_free(&version); 145260ce86c7SWei Liu } 145360ce86c7SWei Liu 14548440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 145560ce86c7SWei Liu { 145660ce86c7SWei Liu V9fsPDU *pdu = opaque; 145760ce86c7SWei Liu V9fsState *s = pdu->s; 145860ce86c7SWei Liu int32_t fid, afid, n_uname; 145960ce86c7SWei Liu V9fsString uname, aname; 146060ce86c7SWei Liu V9fsFidState *fidp; 146160ce86c7SWei Liu size_t offset = 7; 146260ce86c7SWei Liu V9fsQID qid; 146360ce86c7SWei Liu ssize_t err; 146411024375SChristian Schoenebeck struct stat stbuf; 146560ce86c7SWei Liu 146660ce86c7SWei Liu v9fs_string_init(&uname); 146760ce86c7SWei Liu v9fs_string_init(&aname); 146860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 146960ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 147060ce86c7SWei Liu if (err < 0) { 147160ce86c7SWei Liu goto out_nofid; 147260ce86c7SWei Liu } 147360ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 147460ce86c7SWei Liu 147560ce86c7SWei Liu fidp = alloc_fid(s, fid); 147660ce86c7SWei Liu if (fidp == NULL) { 147760ce86c7SWei Liu err = -EINVAL; 147860ce86c7SWei Liu goto out_nofid; 147960ce86c7SWei Liu } 148060ce86c7SWei Liu fidp->uid = n_uname; 148160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 148260ce86c7SWei Liu if (err < 0) { 148360ce86c7SWei Liu err = -EINVAL; 148460ce86c7SWei Liu clunk_fid(s, fid); 148560ce86c7SWei Liu goto out; 148660ce86c7SWei Liu } 148711024375SChristian Schoenebeck err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 148811024375SChristian Schoenebeck if (err < 0) { 148911024375SChristian Schoenebeck err = -EINVAL; 149011024375SChristian Schoenebeck clunk_fid(s, fid); 149111024375SChristian Schoenebeck goto out; 149211024375SChristian Schoenebeck } 149311024375SChristian Schoenebeck err = stat_to_qid(pdu, &stbuf, &qid); 149460ce86c7SWei Liu if (err < 0) { 149560ce86c7SWei Liu err = -EINVAL; 149660ce86c7SWei Liu clunk_fid(s, fid); 149760ce86c7SWei Liu goto out; 149860ce86c7SWei Liu } 1499fe44dc91SAshijeet Acharya 1500fe44dc91SAshijeet Acharya /* 1501fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1502fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1503fe44dc91SAshijeet Acharya */ 1504fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1505fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1506fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1507fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 15089261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 15099261ef5eSMarkus Armbruster if (err < 0) { 1510fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1511fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1512fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1513fe44dc91SAshijeet Acharya goto out; 1514fe44dc91SAshijeet Acharya } 1515fe44dc91SAshijeet Acharya s->root_fid = fid; 1516fe44dc91SAshijeet Acharya } 1517fe44dc91SAshijeet Acharya 151860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 151960ce86c7SWei Liu if (err < 0) { 152060ce86c7SWei Liu clunk_fid(s, fid); 152160ce86c7SWei Liu goto out; 152260ce86c7SWei Liu } 152360ce86c7SWei Liu err += offset; 1524fe44dc91SAshijeet Acharya 152511024375SChristian Schoenebeck memcpy(&s->root_st, &stbuf, sizeof(stbuf)); 152660ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 152760ce86c7SWei Liu qid.type, qid.version, qid.path); 152860ce86c7SWei Liu out: 152960ce86c7SWei Liu put_fid(pdu, fidp); 153060ce86c7SWei Liu out_nofid: 153160ce86c7SWei Liu pdu_complete(pdu, err); 153260ce86c7SWei Liu v9fs_string_free(&uname); 153360ce86c7SWei Liu v9fs_string_free(&aname); 153460ce86c7SWei Liu } 153560ce86c7SWei Liu 15368440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 153760ce86c7SWei Liu { 153860ce86c7SWei Liu int32_t fid; 153960ce86c7SWei Liu V9fsStat v9stat; 154060ce86c7SWei Liu ssize_t err = 0; 154160ce86c7SWei Liu size_t offset = 7; 154260ce86c7SWei Liu struct stat stbuf; 154360ce86c7SWei Liu V9fsFidState *fidp; 154460ce86c7SWei Liu V9fsPDU *pdu = opaque; 15456069537fSJan Dakinevich char *basename; 154660ce86c7SWei Liu 154760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 154860ce86c7SWei Liu if (err < 0) { 154960ce86c7SWei Liu goto out_nofid; 155060ce86c7SWei Liu } 155160ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 155260ce86c7SWei Liu 155360ce86c7SWei Liu fidp = get_fid(pdu, fid); 155460ce86c7SWei Liu if (fidp == NULL) { 155560ce86c7SWei Liu err = -ENOENT; 155660ce86c7SWei Liu goto out_nofid; 155760ce86c7SWei Liu } 155860ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 155960ce86c7SWei Liu if (err < 0) { 156060ce86c7SWei Liu goto out; 156160ce86c7SWei Liu } 15626069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 15636069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 15646069537fSJan Dakinevich g_free(basename); 156560ce86c7SWei Liu if (err < 0) { 156660ce86c7SWei Liu goto out; 156760ce86c7SWei Liu } 156860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 156960ce86c7SWei Liu if (err < 0) { 157060ce86c7SWei Liu v9fs_stat_free(&v9stat); 157160ce86c7SWei Liu goto out; 157260ce86c7SWei Liu } 157360ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 157460ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 157560ce86c7SWei Liu err += offset; 157660ce86c7SWei Liu v9fs_stat_free(&v9stat); 157760ce86c7SWei Liu out: 157860ce86c7SWei Liu put_fid(pdu, fidp); 157960ce86c7SWei Liu out_nofid: 158060ce86c7SWei Liu pdu_complete(pdu, err); 158160ce86c7SWei Liu } 158260ce86c7SWei Liu 15838440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 158460ce86c7SWei Liu { 158560ce86c7SWei Liu int32_t fid; 158660ce86c7SWei Liu size_t offset = 7; 158760ce86c7SWei Liu ssize_t retval = 0; 158860ce86c7SWei Liu struct stat stbuf; 158960ce86c7SWei Liu V9fsFidState *fidp; 159060ce86c7SWei Liu uint64_t request_mask; 159160ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 159260ce86c7SWei Liu V9fsPDU *pdu = opaque; 159360ce86c7SWei Liu 159460ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 159560ce86c7SWei Liu if (retval < 0) { 159660ce86c7SWei Liu goto out_nofid; 159760ce86c7SWei Liu } 159860ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 159960ce86c7SWei Liu 160060ce86c7SWei Liu fidp = get_fid(pdu, fid); 160160ce86c7SWei Liu if (fidp == NULL) { 160260ce86c7SWei Liu retval = -ENOENT; 160360ce86c7SWei Liu goto out_nofid; 160460ce86c7SWei Liu } 160560ce86c7SWei Liu /* 160660ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 160760ce86c7SWei Liu * need to look at request_mask. 160860ce86c7SWei Liu */ 160960ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 161060ce86c7SWei Liu if (retval < 0) { 161160ce86c7SWei Liu goto out; 161260ce86c7SWei Liu } 16133b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 16143b5ee9e8SAntonios Motakis if (retval < 0) { 16153b5ee9e8SAntonios Motakis goto out; 16163b5ee9e8SAntonios Motakis } 161760ce86c7SWei Liu 161860ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 161960ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 162060ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 162160ce86c7SWei Liu switch (retval) { 162260ce86c7SWei Liu case 0: 162360ce86c7SWei Liu /* we have valid st_gen: update result mask */ 162460ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 162560ce86c7SWei Liu break; 162660ce86c7SWei Liu case -EINTR: 162760ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 162860ce86c7SWei Liu goto out; 162960ce86c7SWei Liu default: 163060ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 163160ce86c7SWei Liu break; 163260ce86c7SWei Liu } 163360ce86c7SWei Liu } 163460ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 163560ce86c7SWei Liu if (retval < 0) { 163660ce86c7SWei Liu goto out; 163760ce86c7SWei Liu } 163860ce86c7SWei Liu retval += offset; 163960ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 164060ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 164160ce86c7SWei Liu v9stat_dotl.st_gid); 164260ce86c7SWei Liu out: 164360ce86c7SWei Liu put_fid(pdu, fidp); 164460ce86c7SWei Liu out_nofid: 164560ce86c7SWei Liu pdu_complete(pdu, retval); 164660ce86c7SWei Liu } 164760ce86c7SWei Liu 164860ce86c7SWei Liu /* Attribute flags */ 164960ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 165060ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 165160ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 165260ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 165360ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 165460ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 165560ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 165660ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 165760ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 165860ce86c7SWei Liu 165960ce86c7SWei Liu #define P9_ATTR_MASK 127 166060ce86c7SWei Liu 16618440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 166260ce86c7SWei Liu { 166360ce86c7SWei Liu int err = 0; 166460ce86c7SWei Liu int32_t fid; 166560ce86c7SWei Liu V9fsFidState *fidp; 166660ce86c7SWei Liu size_t offset = 7; 166760ce86c7SWei Liu V9fsIattr v9iattr; 166860ce86c7SWei Liu V9fsPDU *pdu = opaque; 166960ce86c7SWei Liu 167060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 167160ce86c7SWei Liu if (err < 0) { 167260ce86c7SWei Liu goto out_nofid; 167360ce86c7SWei Liu } 167460ce86c7SWei Liu 16758f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16768f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16778f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16788f9c64bfSGreg Kurz 167960ce86c7SWei Liu fidp = get_fid(pdu, fid); 168060ce86c7SWei Liu if (fidp == NULL) { 168160ce86c7SWei Liu err = -EINVAL; 168260ce86c7SWei Liu goto out_nofid; 168360ce86c7SWei Liu } 168460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 168560ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 168660ce86c7SWei Liu if (err < 0) { 168760ce86c7SWei Liu goto out; 168860ce86c7SWei Liu } 168960ce86c7SWei Liu } 169060ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 169160ce86c7SWei Liu struct timespec times[2]; 169260ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 169360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 169460ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 169560ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 169660ce86c7SWei Liu } else { 169760ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 169860ce86c7SWei Liu } 169960ce86c7SWei Liu } else { 170060ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 170160ce86c7SWei Liu } 170260ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 170360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 170460ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 170560ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 170660ce86c7SWei Liu } else { 170760ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 170860ce86c7SWei Liu } 170960ce86c7SWei Liu } else { 171060ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 171160ce86c7SWei Liu } 171260ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 171360ce86c7SWei Liu if (err < 0) { 171460ce86c7SWei Liu goto out; 171560ce86c7SWei Liu } 171660ce86c7SWei Liu } 171760ce86c7SWei Liu /* 171860ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 171960ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 172060ce86c7SWei Liu */ 172160ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 172260ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 172360ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 172460ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 172560ce86c7SWei Liu v9iattr.uid = -1; 172660ce86c7SWei Liu } 172760ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 172860ce86c7SWei Liu v9iattr.gid = -1; 172960ce86c7SWei Liu } 173060ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 173160ce86c7SWei Liu v9iattr.gid); 173260ce86c7SWei Liu if (err < 0) { 173360ce86c7SWei Liu goto out; 173460ce86c7SWei Liu } 173560ce86c7SWei Liu } 173660ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 173760ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 173860ce86c7SWei Liu if (err < 0) { 173960ce86c7SWei Liu goto out; 174060ce86c7SWei Liu } 174160ce86c7SWei Liu } 174260ce86c7SWei Liu err = offset; 17438f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 174460ce86c7SWei Liu out: 174560ce86c7SWei Liu put_fid(pdu, fidp); 174660ce86c7SWei Liu out_nofid: 174760ce86c7SWei Liu pdu_complete(pdu, err); 174860ce86c7SWei Liu } 174960ce86c7SWei Liu 175060ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 175160ce86c7SWei Liu { 175260ce86c7SWei Liu int i; 175360ce86c7SWei Liu ssize_t err; 175460ce86c7SWei Liu size_t offset = 7; 175560ce86c7SWei Liu 175660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 175760ce86c7SWei Liu if (err < 0) { 175860ce86c7SWei Liu return err; 175960ce86c7SWei Liu } 176060ce86c7SWei Liu offset += err; 176160ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 176260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 176360ce86c7SWei Liu if (err < 0) { 176460ce86c7SWei Liu return err; 176560ce86c7SWei Liu } 176660ce86c7SWei Liu offset += err; 176760ce86c7SWei Liu } 176860ce86c7SWei Liu return offset; 176960ce86c7SWei Liu } 177060ce86c7SWei Liu 1771fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1772fff39a7aSGreg Kurz { 1773fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1774fff39a7aSGreg Kurz } 1775fff39a7aSGreg Kurz 1776f22cad42SChristian Schoenebeck static bool same_stat_id(const struct stat *a, const struct stat *b) 177756f101ecSGreg Kurz { 1778f22cad42SChristian Schoenebeck return a->st_dev == b->st_dev && a->st_ino == b->st_ino; 177956f101ecSGreg Kurz } 178056f101ecSGreg Kurz 17818440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 178260ce86c7SWei Liu { 1783fd6c979eSChristian Schoenebeck int name_idx, nwalked; 1784869605b5SChristian Schoenebeck g_autofree V9fsQID *qids = NULL; 1785a93d2e89SChristian Schoenebeck int i, err = 0, any_err = 0; 17867e985780SChristian Schoenebeck V9fsPath dpath, path; 17877e985780SChristian Schoenebeck P9ARRAY_REF(V9fsPath) pathes = NULL; 178860ce86c7SWei Liu uint16_t nwnames; 1789869605b5SChristian Schoenebeck struct stat stbuf, fidst; 1790869605b5SChristian Schoenebeck g_autofree struct stat *stbufs = NULL; 179160ce86c7SWei Liu size_t offset = 7; 179260ce86c7SWei Liu int32_t fid, newfid; 17937e985780SChristian Schoenebeck P9ARRAY_REF(V9fsString) wnames = NULL; 179460ce86c7SWei Liu V9fsFidState *fidp; 179560ce86c7SWei Liu V9fsFidState *newfidp = NULL; 179660ce86c7SWei Liu V9fsPDU *pdu = opaque; 179760ce86c7SWei Liu V9fsState *s = pdu->s; 179856f101ecSGreg Kurz V9fsQID qid; 179960ce86c7SWei Liu 180060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 180160ce86c7SWei Liu if (err < 0) { 180260ce86c7SWei Liu pdu_complete(pdu, err); 180360ce86c7SWei Liu return; 180460ce86c7SWei Liu } 180560ce86c7SWei Liu offset += err; 180660ce86c7SWei Liu 180760ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 180860ce86c7SWei Liu 1809232a4d2cSChristian Schoenebeck if (nwnames > P9_MAXWELEM) { 1810232a4d2cSChristian Schoenebeck err = -EINVAL; 1811232a4d2cSChristian Schoenebeck goto out_nofid; 1812232a4d2cSChristian Schoenebeck } 1813232a4d2cSChristian Schoenebeck if (nwnames) { 18147e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsString, wnames, nwnames); 18151923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 18168d6cb100SChristian Schoenebeck stbufs = g_new0(struct stat, nwnames); 18177e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsPath, pathes, nwnames); 181860ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 181960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 182060ce86c7SWei Liu if (err < 0) { 182160ce86c7SWei Liu goto out_nofid; 182260ce86c7SWei Liu } 1823fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1824fff39a7aSGreg Kurz err = -ENOENT; 1825fff39a7aSGreg Kurz goto out_nofid; 1826fff39a7aSGreg Kurz } 182760ce86c7SWei Liu offset += err; 182860ce86c7SWei Liu } 182960ce86c7SWei Liu } 183060ce86c7SWei Liu fidp = get_fid(pdu, fid); 183160ce86c7SWei Liu if (fidp == NULL) { 183260ce86c7SWei Liu err = -ENOENT; 183360ce86c7SWei Liu goto out_nofid; 183460ce86c7SWei Liu } 183556f101ecSGreg Kurz 183613fd08e6SGreg Kurz v9fs_path_init(&dpath); 183713fd08e6SGreg Kurz v9fs_path_init(&path); 183860ce86c7SWei Liu /* 18398d6cb100SChristian Schoenebeck * Both dpath and path initially point to fidp. 184060ce86c7SWei Liu * Needed to handle request with nwnames == 0 184160ce86c7SWei Liu */ 184260ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 184360ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 18448d6cb100SChristian Schoenebeck 18458d6cb100SChristian Schoenebeck /* 18468d6cb100SChristian Schoenebeck * To keep latency (i.e. overall execution time for processing this 18478d6cb100SChristian Schoenebeck * Twalk client request) as small as possible, run all the required fs 18488d6cb100SChristian Schoenebeck * driver code altogether inside the following block. 18498d6cb100SChristian Schoenebeck */ 18508d6cb100SChristian Schoenebeck v9fs_co_run_in_worker({ 1851a93d2e89SChristian Schoenebeck nwalked = 0; 18528d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 1853a93d2e89SChristian Schoenebeck any_err |= err = -EINTR; 18548d6cb100SChristian Schoenebeck break; 18558d6cb100SChristian Schoenebeck } 18568d6cb100SChristian Schoenebeck err = s->ops->lstat(&s->ctx, &dpath, &fidst); 18578d6cb100SChristian Schoenebeck if (err < 0) { 1858a93d2e89SChristian Schoenebeck any_err |= err = -errno; 18598d6cb100SChristian Schoenebeck break; 18608d6cb100SChristian Schoenebeck } 18618d6cb100SChristian Schoenebeck stbuf = fidst; 1862a93d2e89SChristian Schoenebeck for (; nwalked < nwnames; nwalked++) { 18638d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 1864a93d2e89SChristian Schoenebeck any_err |= err = -EINTR; 18658d6cb100SChristian Schoenebeck break; 18668d6cb100SChristian Schoenebeck } 1867f22cad42SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 1868fd6c979eSChristian Schoenebeck strcmp("..", wnames[nwalked].data)) 18698d6cb100SChristian Schoenebeck { 18708d6cb100SChristian Schoenebeck err = s->ops->name_to_path(&s->ctx, &dpath, 1871fd6c979eSChristian Schoenebeck wnames[nwalked].data, 1872fd6c979eSChristian Schoenebeck &pathes[nwalked]); 18738d6cb100SChristian Schoenebeck if (err < 0) { 1874a93d2e89SChristian Schoenebeck any_err |= err = -errno; 18758d6cb100SChristian Schoenebeck break; 18768d6cb100SChristian Schoenebeck } 18778d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 1878a93d2e89SChristian Schoenebeck any_err |= err = -EINTR; 18798d6cb100SChristian Schoenebeck break; 18808d6cb100SChristian Schoenebeck } 1881fd6c979eSChristian Schoenebeck err = s->ops->lstat(&s->ctx, &pathes[nwalked], &stbuf); 18828d6cb100SChristian Schoenebeck if (err < 0) { 1883a93d2e89SChristian Schoenebeck any_err |= err = -errno; 18848d6cb100SChristian Schoenebeck break; 18858d6cb100SChristian Schoenebeck } 1886fd6c979eSChristian Schoenebeck stbufs[nwalked] = stbuf; 1887fd6c979eSChristian Schoenebeck v9fs_path_copy(&dpath, &pathes[nwalked]); 18888d6cb100SChristian Schoenebeck } 18898d6cb100SChristian Schoenebeck } 18908d6cb100SChristian Schoenebeck }); 18918d6cb100SChristian Schoenebeck /* 18928d6cb100SChristian Schoenebeck * Handle all the rest of this Twalk request on main thread ... 1893a93d2e89SChristian Schoenebeck * 1894a93d2e89SChristian Schoenebeck * NOTE: -EINTR is an exception where we deviate from the protocol spec 1895a93d2e89SChristian Schoenebeck * and simply send a (R)Lerror response instead of bothering to assemble 1896a93d2e89SChristian Schoenebeck * a (deducted) Rwalk response; because -EINTR is always the result of a 1897a93d2e89SChristian Schoenebeck * Tflush request, so client would no longer wait for a response in this 1898a93d2e89SChristian Schoenebeck * case anyway. 18998d6cb100SChristian Schoenebeck */ 1900a93d2e89SChristian Schoenebeck if ((err < 0 && !nwalked) || err == -EINTR) { 190160ce86c7SWei Liu goto out; 190260ce86c7SWei Liu } 190356f101ecSGreg Kurz 1904a93d2e89SChristian Schoenebeck any_err |= err = stat_to_qid(pdu, &fidst, &qid); 1905a93d2e89SChristian Schoenebeck if (err < 0 && !nwalked) { 190660ce86c7SWei Liu goto out; 190760ce86c7SWei Liu } 19088d6cb100SChristian Schoenebeck stbuf = fidst; 19098d6cb100SChristian Schoenebeck 19108d6cb100SChristian Schoenebeck /* reset dpath and path */ 19118d6cb100SChristian Schoenebeck v9fs_path_copy(&dpath, &fidp->path); 19128d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &fidp->path); 19138d6cb100SChristian Schoenebeck 1914a93d2e89SChristian Schoenebeck for (name_idx = 0; name_idx < nwalked; name_idx++) { 19158d6cb100SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 19168d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 19178d6cb100SChristian Schoenebeck { 19188d6cb100SChristian Schoenebeck stbuf = stbufs[name_idx]; 1919a93d2e89SChristian Schoenebeck any_err |= err = stat_to_qid(pdu, &stbuf, &qid); 19203b5ee9e8SAntonios Motakis if (err < 0) { 1921a93d2e89SChristian Schoenebeck break; 19223b5ee9e8SAntonios Motakis } 19238d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &pathes[name_idx]); 192460ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 192560ce86c7SWei Liu } 192656f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 192756f101ecSGreg Kurz } 1928a93d2e89SChristian Schoenebeck if (any_err < 0) { 1929a93d2e89SChristian Schoenebeck if (!name_idx) { 1930a93d2e89SChristian Schoenebeck /* don't send any QIDs, send Rlerror instead */ 1931a93d2e89SChristian Schoenebeck goto out; 1932a93d2e89SChristian Schoenebeck } else { 1933a93d2e89SChristian Schoenebeck /* send QIDs (not Rlerror), but fid MUST remain unaffected */ 1934a93d2e89SChristian Schoenebeck goto send_qids; 1935a93d2e89SChristian Schoenebeck } 1936a93d2e89SChristian Schoenebeck } 193760ce86c7SWei Liu if (fid == newfid) { 193849dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 193949dd946bSGreg Kurz err = -EINVAL; 194049dd946bSGreg Kurz goto out; 194149dd946bSGreg Kurz } 19425b3c77aaSGreg Kurz v9fs_path_write_lock(s); 194360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 19445b3c77aaSGreg Kurz v9fs_path_unlock(s); 194560ce86c7SWei Liu } else { 194660ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 194760ce86c7SWei Liu if (newfidp == NULL) { 194860ce86c7SWei Liu err = -EINVAL; 194960ce86c7SWei Liu goto out; 195060ce86c7SWei Liu } 195160ce86c7SWei Liu newfidp->uid = fidp->uid; 195260ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 195360ce86c7SWei Liu } 1954a93d2e89SChristian Schoenebeck send_qids: 1955a93d2e89SChristian Schoenebeck err = v9fs_walk_marshal(pdu, name_idx, qids); 1956a93d2e89SChristian Schoenebeck trace_v9fs_walk_return(pdu->tag, pdu->id, name_idx, qids); 195760ce86c7SWei Liu out: 195860ce86c7SWei Liu put_fid(pdu, fidp); 195960ce86c7SWei Liu if (newfidp) { 196060ce86c7SWei Liu put_fid(pdu, newfidp); 196160ce86c7SWei Liu } 196260ce86c7SWei Liu v9fs_path_free(&dpath); 196360ce86c7SWei Liu v9fs_path_free(&path); 196460ce86c7SWei Liu out_nofid: 196560ce86c7SWei Liu pdu_complete(pdu, err); 196660ce86c7SWei Liu } 196760ce86c7SWei Liu 19688440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 196960ce86c7SWei Liu { 197060ce86c7SWei Liu struct statfs stbuf; 1971b565bccbSChristian Schoenebeck int err = v9fs_co_statfs(pdu, path, &stbuf); 197260ce86c7SWei Liu 1973b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, (err >= 0) ? stbuf.f_bsize : 0); 197460ce86c7SWei Liu } 197560ce86c7SWei Liu 19768440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 197760ce86c7SWei Liu { 197860ce86c7SWei Liu int flags; 197960ce86c7SWei Liu int32_t fid; 198060ce86c7SWei Liu int32_t mode; 198160ce86c7SWei Liu V9fsQID qid; 198260ce86c7SWei Liu int iounit = 0; 198360ce86c7SWei Liu ssize_t err = 0; 198460ce86c7SWei Liu size_t offset = 7; 198560ce86c7SWei Liu struct stat stbuf; 198660ce86c7SWei Liu V9fsFidState *fidp; 198760ce86c7SWei Liu V9fsPDU *pdu = opaque; 198860ce86c7SWei Liu V9fsState *s = pdu->s; 198960ce86c7SWei Liu 199060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 199160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 199260ce86c7SWei Liu } else { 199360ce86c7SWei Liu uint8_t modebyte; 199460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 199560ce86c7SWei Liu mode = modebyte; 199660ce86c7SWei Liu } 199760ce86c7SWei Liu if (err < 0) { 199860ce86c7SWei Liu goto out_nofid; 199960ce86c7SWei Liu } 200060ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 200160ce86c7SWei Liu 200260ce86c7SWei Liu fidp = get_fid(pdu, fid); 200360ce86c7SWei Liu if (fidp == NULL) { 200460ce86c7SWei Liu err = -ENOENT; 200560ce86c7SWei Liu goto out_nofid; 200660ce86c7SWei Liu } 200749dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 200849dd946bSGreg Kurz err = -EINVAL; 200949dd946bSGreg Kurz goto out; 201049dd946bSGreg Kurz } 201160ce86c7SWei Liu 201260ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 201360ce86c7SWei Liu if (err < 0) { 201460ce86c7SWei Liu goto out; 201560ce86c7SWei Liu } 20163b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20173b5ee9e8SAntonios Motakis if (err < 0) { 20183b5ee9e8SAntonios Motakis goto out; 20193b5ee9e8SAntonios Motakis } 202060ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 202160ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 202260ce86c7SWei Liu if (err < 0) { 202360ce86c7SWei Liu goto out; 202460ce86c7SWei Liu } 202560ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 202660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 202760ce86c7SWei Liu if (err < 0) { 202860ce86c7SWei Liu goto out; 202960ce86c7SWei Liu } 203060ce86c7SWei Liu err += offset; 203160ce86c7SWei Liu } else { 203260ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 203360ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 203460ce86c7SWei Liu } else { 203560ce86c7SWei Liu flags = omode_to_uflags(mode); 203660ce86c7SWei Liu } 203760ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 203860ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 203960ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 204060ce86c7SWei Liu err = -EROFS; 204160ce86c7SWei Liu goto out; 204260ce86c7SWei Liu } 204360ce86c7SWei Liu } 204460ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 204560ce86c7SWei Liu if (err < 0) { 204660ce86c7SWei Liu goto out; 204760ce86c7SWei Liu } 204860ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 204960ce86c7SWei Liu fidp->open_flags = flags; 205060ce86c7SWei Liu if (flags & O_EXCL) { 205160ce86c7SWei Liu /* 205260ce86c7SWei Liu * We let the host file system do O_EXCL check 205360ce86c7SWei Liu * We should not reclaim such fd 205460ce86c7SWei Liu */ 205560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 205660ce86c7SWei Liu } 205760ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 205860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 205960ce86c7SWei Liu if (err < 0) { 206060ce86c7SWei Liu goto out; 206160ce86c7SWei Liu } 206260ce86c7SWei Liu err += offset; 206360ce86c7SWei Liu } 206460ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 206560ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 206660ce86c7SWei Liu out: 206760ce86c7SWei Liu put_fid(pdu, fidp); 206860ce86c7SWei Liu out_nofid: 206960ce86c7SWei Liu pdu_complete(pdu, err); 207060ce86c7SWei Liu } 207160ce86c7SWei Liu 20728440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 207360ce86c7SWei Liu { 207460ce86c7SWei Liu int32_t dfid, flags, mode; 207560ce86c7SWei Liu gid_t gid; 207660ce86c7SWei Liu ssize_t err = 0; 207760ce86c7SWei Liu ssize_t offset = 7; 207860ce86c7SWei Liu V9fsString name; 207960ce86c7SWei Liu V9fsFidState *fidp; 208060ce86c7SWei Liu struct stat stbuf; 208160ce86c7SWei Liu V9fsQID qid; 208260ce86c7SWei Liu int32_t iounit; 208360ce86c7SWei Liu V9fsPDU *pdu = opaque; 208460ce86c7SWei Liu 208560ce86c7SWei Liu v9fs_string_init(&name); 208660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 208760ce86c7SWei Liu &name, &flags, &mode, &gid); 208860ce86c7SWei Liu if (err < 0) { 208960ce86c7SWei Liu goto out_nofid; 209060ce86c7SWei Liu } 209160ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 209260ce86c7SWei Liu 2093fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2094fff39a7aSGreg Kurz err = -ENOENT; 2095fff39a7aSGreg Kurz goto out_nofid; 2096fff39a7aSGreg Kurz } 2097fff39a7aSGreg Kurz 2098805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2099805b5d98SGreg Kurz err = -EEXIST; 2100805b5d98SGreg Kurz goto out_nofid; 2101805b5d98SGreg Kurz } 2102805b5d98SGreg Kurz 210360ce86c7SWei Liu fidp = get_fid(pdu, dfid); 210460ce86c7SWei Liu if (fidp == NULL) { 210560ce86c7SWei Liu err = -ENOENT; 210660ce86c7SWei Liu goto out_nofid; 210760ce86c7SWei Liu } 2108d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2109d63fb193SLi Qiang err = -EINVAL; 2110d63fb193SLi Qiang goto out; 2111d63fb193SLi Qiang } 211260ce86c7SWei Liu 211360ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 211460ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 211560ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 211660ce86c7SWei Liu if (err < 0) { 211760ce86c7SWei Liu goto out; 211860ce86c7SWei Liu } 211960ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 212060ce86c7SWei Liu fidp->open_flags = flags; 212160ce86c7SWei Liu if (flags & O_EXCL) { 212260ce86c7SWei Liu /* 212360ce86c7SWei Liu * We let the host file system do O_EXCL check 212460ce86c7SWei Liu * We should not reclaim such fd 212560ce86c7SWei Liu */ 212660ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 212760ce86c7SWei Liu } 212860ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 21293b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 21303b5ee9e8SAntonios Motakis if (err < 0) { 21313b5ee9e8SAntonios Motakis goto out; 21323b5ee9e8SAntonios Motakis } 213360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 213460ce86c7SWei Liu if (err < 0) { 213560ce86c7SWei Liu goto out; 213660ce86c7SWei Liu } 213760ce86c7SWei Liu err += offset; 213860ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 213960ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 214060ce86c7SWei Liu out: 214160ce86c7SWei Liu put_fid(pdu, fidp); 214260ce86c7SWei Liu out_nofid: 214360ce86c7SWei Liu pdu_complete(pdu, err); 214460ce86c7SWei Liu v9fs_string_free(&name); 214560ce86c7SWei Liu } 214660ce86c7SWei Liu 2147a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 214860ce86c7SWei Liu { 214960ce86c7SWei Liu int err; 215060ce86c7SWei Liu int32_t fid; 215160ce86c7SWei Liu int datasync; 215260ce86c7SWei Liu size_t offset = 7; 215360ce86c7SWei Liu V9fsFidState *fidp; 215460ce86c7SWei Liu V9fsPDU *pdu = opaque; 215560ce86c7SWei Liu 215660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 215760ce86c7SWei Liu if (err < 0) { 215860ce86c7SWei Liu goto out_nofid; 215960ce86c7SWei Liu } 216060ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 216160ce86c7SWei Liu 216260ce86c7SWei Liu fidp = get_fid(pdu, fid); 216360ce86c7SWei Liu if (fidp == NULL) { 216460ce86c7SWei Liu err = -ENOENT; 216560ce86c7SWei Liu goto out_nofid; 216660ce86c7SWei Liu } 216760ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 216860ce86c7SWei Liu if (!err) { 216960ce86c7SWei Liu err = offset; 217060ce86c7SWei Liu } 217160ce86c7SWei Liu put_fid(pdu, fidp); 217260ce86c7SWei Liu out_nofid: 217360ce86c7SWei Liu pdu_complete(pdu, err); 217460ce86c7SWei Liu } 217560ce86c7SWei Liu 21768440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 217760ce86c7SWei Liu { 217860ce86c7SWei Liu int err; 217960ce86c7SWei Liu int32_t fid; 218060ce86c7SWei Liu size_t offset = 7; 218160ce86c7SWei Liu V9fsFidState *fidp; 218260ce86c7SWei Liu V9fsPDU *pdu = opaque; 218360ce86c7SWei Liu V9fsState *s = pdu->s; 218460ce86c7SWei Liu 218560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 218660ce86c7SWei Liu if (err < 0) { 218760ce86c7SWei Liu goto out_nofid; 218860ce86c7SWei Liu } 218960ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 219060ce86c7SWei Liu 219160ce86c7SWei Liu fidp = clunk_fid(s, fid); 219260ce86c7SWei Liu if (fidp == NULL) { 219360ce86c7SWei Liu err = -ENOENT; 219460ce86c7SWei Liu goto out_nofid; 219560ce86c7SWei Liu } 219660ce86c7SWei Liu /* 219760ce86c7SWei Liu * Bump the ref so that put_fid will 219860ce86c7SWei Liu * free the fid. 219960ce86c7SWei Liu */ 220060ce86c7SWei Liu fidp->ref++; 220160ce86c7SWei Liu err = put_fid(pdu, fidp); 220260ce86c7SWei Liu if (!err) { 220360ce86c7SWei Liu err = offset; 220460ce86c7SWei Liu } 220560ce86c7SWei Liu out_nofid: 220660ce86c7SWei Liu pdu_complete(pdu, err); 220760ce86c7SWei Liu } 220860ce86c7SWei Liu 2209bcb8998fSStefano Stabellini /* 2210bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2211bcb8998fSStefano Stabellini * 2212bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2213bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2214bcb8998fSStefano Stabellini * @size: number of bytes to include 2215bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2216bcb8998fSStefano Stabellini * 2217bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2218bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2219bcb8998fSStefano Stabellini */ 2220bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2221cf45183bSStefano Stabellini size_t skip, size_t size, 2222bcb8998fSStefano Stabellini bool is_write) 2223bcb8998fSStefano Stabellini { 2224bcb8998fSStefano Stabellini QEMUIOVector elem; 2225bcb8998fSStefano Stabellini struct iovec *iov; 2226bcb8998fSStefano Stabellini unsigned int niov; 2227bcb8998fSStefano Stabellini 222888da0b03SStefano Stabellini if (is_write) { 2229cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 223088da0b03SStefano Stabellini } else { 2231cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 223288da0b03SStefano Stabellini } 2233bcb8998fSStefano Stabellini 2234bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2235bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2236cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2237bcb8998fSStefano Stabellini } 2238bcb8998fSStefano Stabellini 223960ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 224060ce86c7SWei Liu uint64_t off, uint32_t max_count) 224160ce86c7SWei Liu { 224260ce86c7SWei Liu ssize_t err; 224360ce86c7SWei Liu size_t offset = 7; 2244cf45183bSStefano Stabellini uint64_t read_count; 2245bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 224660ce86c7SWei Liu 22477e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 22487e55d65cSLi Qiang read_count = 0; 224916724a17SGreg Kurz } else { 2250cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2251cf45183bSStefano Stabellini } 2252cf45183bSStefano Stabellini if (read_count > max_count) { 225360ce86c7SWei Liu read_count = max_count; 225460ce86c7SWei Liu } 225560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 225660ce86c7SWei Liu if (err < 0) { 225760ce86c7SWei Liu return err; 225860ce86c7SWei Liu } 225960ce86c7SWei Liu offset += err; 226000588a0aSWei Liu 2261cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2262fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 226360ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 226460ce86c7SWei Liu read_count); 2265bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 226660ce86c7SWei Liu if (err < 0) { 226760ce86c7SWei Liu return err; 226860ce86c7SWei Liu } 226960ce86c7SWei Liu offset += err; 227060ce86c7SWei Liu return offset; 227160ce86c7SWei Liu } 227260ce86c7SWei Liu 22738440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 22748440e22eSGreg Kurz V9fsFidState *fidp, 22758440e22eSGreg Kurz uint32_t max_count) 227660ce86c7SWei Liu { 227760ce86c7SWei Liu V9fsPath path; 227860ce86c7SWei Liu V9fsStat v9stat; 227960ce86c7SWei Liu int len, err = 0; 228060ce86c7SWei Liu int32_t count = 0; 228160ce86c7SWei Liu struct stat stbuf; 228260ce86c7SWei Liu off_t saved_dir_pos; 2283635324e8SGreg Kurz struct dirent *dent; 228460ce86c7SWei Liu 228560ce86c7SWei Liu /* save the directory position */ 228660ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 228760ce86c7SWei Liu if (saved_dir_pos < 0) { 228860ce86c7SWei Liu return saved_dir_pos; 228960ce86c7SWei Liu } 229060ce86c7SWei Liu 229160ce86c7SWei Liu while (1) { 229260ce86c7SWei Liu v9fs_path_init(&path); 22937cde47d4SGreg Kurz 22947cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 22957cde47d4SGreg Kurz 2296635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2297635324e8SGreg Kurz if (err || !dent) { 229860ce86c7SWei Liu break; 229960ce86c7SWei Liu } 230060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 230160ce86c7SWei Liu if (err < 0) { 23028762a46dSGreg Kurz break; 230360ce86c7SWei Liu } 230460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 230560ce86c7SWei Liu if (err < 0) { 23068762a46dSGreg Kurz break; 230760ce86c7SWei Liu } 23086069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 230960ce86c7SWei Liu if (err < 0) { 23108762a46dSGreg Kurz break; 231160ce86c7SWei Liu } 2312772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 23137cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 23147cde47d4SGreg Kurz 231560ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 231660ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 231760ce86c7SWei Liu v9fs_stat_free(&v9stat); 231860ce86c7SWei Liu v9fs_path_free(&path); 231960ce86c7SWei Liu return count; 232060ce86c7SWei Liu } 2321772a7369SJan Dakinevich 2322772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2323772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2324772a7369SJan Dakinevich 2325772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2326772a7369SJan Dakinevich 2327772a7369SJan Dakinevich if (len < 0) { 2328772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2329772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2330772a7369SJan Dakinevich v9fs_path_free(&path); 2331772a7369SJan Dakinevich return len; 2332772a7369SJan Dakinevich } 233360ce86c7SWei Liu count += len; 233460ce86c7SWei Liu v9fs_stat_free(&v9stat); 233560ce86c7SWei Liu v9fs_path_free(&path); 23366b3b279bSKeno Fischer saved_dir_pos = qemu_dirent_off(dent); 233760ce86c7SWei Liu } 23388762a46dSGreg Kurz 23397cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 23407cde47d4SGreg Kurz 234160ce86c7SWei Liu v9fs_path_free(&path); 234260ce86c7SWei Liu if (err < 0) { 234360ce86c7SWei Liu return err; 234460ce86c7SWei Liu } 234560ce86c7SWei Liu return count; 234660ce86c7SWei Liu } 234760ce86c7SWei Liu 23488440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 234960ce86c7SWei Liu { 235060ce86c7SWei Liu int32_t fid; 235160ce86c7SWei Liu uint64_t off; 235260ce86c7SWei Liu ssize_t err = 0; 235360ce86c7SWei Liu int32_t count = 0; 235460ce86c7SWei Liu size_t offset = 7; 235560ce86c7SWei Liu uint32_t max_count; 235660ce86c7SWei Liu V9fsFidState *fidp; 235760ce86c7SWei Liu V9fsPDU *pdu = opaque; 235860ce86c7SWei Liu V9fsState *s = pdu->s; 235960ce86c7SWei Liu 236060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 236160ce86c7SWei Liu if (err < 0) { 236260ce86c7SWei Liu goto out_nofid; 236360ce86c7SWei Liu } 236460ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 236560ce86c7SWei Liu 236660ce86c7SWei Liu fidp = get_fid(pdu, fid); 236760ce86c7SWei Liu if (fidp == NULL) { 236860ce86c7SWei Liu err = -EINVAL; 236960ce86c7SWei Liu goto out_nofid; 237060ce86c7SWei Liu } 237160ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2372d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2373d2c5cf7cSChristian Schoenebeck warn_report_once( 2374d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2375d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2376d2c5cf7cSChristian Schoenebeck ); 2377d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2378d2c5cf7cSChristian Schoenebeck goto out; 2379d2c5cf7cSChristian Schoenebeck } 238060ce86c7SWei Liu if (off == 0) { 238160ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 238260ce86c7SWei Liu } 238360ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 238460ce86c7SWei Liu if (count < 0) { 238560ce86c7SWei Liu err = count; 238660ce86c7SWei Liu goto out; 238760ce86c7SWei Liu } 238860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 238960ce86c7SWei Liu if (err < 0) { 239060ce86c7SWei Liu goto out; 239160ce86c7SWei Liu } 239260ce86c7SWei Liu err += offset + count; 239360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 239460ce86c7SWei Liu QEMUIOVector qiov_full; 239560ce86c7SWei Liu QEMUIOVector qiov; 239660ce86c7SWei Liu int32_t len; 239760ce86c7SWei Liu 2398cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 239960ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 240060ce86c7SWei Liu do { 240160ce86c7SWei Liu qemu_iovec_reset(&qiov); 240260ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 240360ce86c7SWei Liu if (0) { 240460ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 240560ce86c7SWei Liu } 240660ce86c7SWei Liu /* Loop in case of EINTR */ 240760ce86c7SWei Liu do { 240860ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 240960ce86c7SWei Liu if (len >= 0) { 241060ce86c7SWei Liu off += len; 241160ce86c7SWei Liu count += len; 241260ce86c7SWei Liu } 241360ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 241460ce86c7SWei Liu if (len < 0) { 241560ce86c7SWei Liu /* IO error return the error */ 241660ce86c7SWei Liu err = len; 2417e95c9a49SLi Qiang goto out_free_iovec; 241860ce86c7SWei Liu } 241960ce86c7SWei Liu } while (count < max_count && len > 0); 242060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 242160ce86c7SWei Liu if (err < 0) { 2422e95c9a49SLi Qiang goto out_free_iovec; 242360ce86c7SWei Liu } 242460ce86c7SWei Liu err += offset + count; 2425e95c9a49SLi Qiang out_free_iovec: 242660ce86c7SWei Liu qemu_iovec_destroy(&qiov); 242760ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 242860ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 242960ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 243060ce86c7SWei Liu } else { 243160ce86c7SWei Liu err = -EINVAL; 243260ce86c7SWei Liu } 243360ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 243460ce86c7SWei Liu out: 243560ce86c7SWei Liu put_fid(pdu, fidp); 243660ce86c7SWei Liu out_nofid: 243760ce86c7SWei Liu pdu_complete(pdu, err); 243860ce86c7SWei Liu } 243960ce86c7SWei Liu 244029c9d2caSChristian Schoenebeck /** 2441e16fea41SChristian Schoenebeck * v9fs_readdir_response_size() - Returns size required in Rreaddir response 2442e16fea41SChristian Schoenebeck * for the passed dirent @name. 244329c9d2caSChristian Schoenebeck * 2444e16fea41SChristian Schoenebeck * @name: directory entry's name (i.e. file name, directory name) 2445e16fea41SChristian Schoenebeck * Return: required size in bytes 244629c9d2caSChristian Schoenebeck */ 244729c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 244860ce86c7SWei Liu { 244960ce86c7SWei Liu /* 245060ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 245160ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 245260ce86c7SWei Liu */ 245360ce86c7SWei Liu return 24 + v9fs_string_size(name); 245460ce86c7SWei Liu } 245560ce86c7SWei Liu 24560c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 24570c4356baSChristian Schoenebeck { 24580c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 24590c4356baSChristian Schoenebeck 24600c4356baSChristian Schoenebeck for (; e; e = next) { 24610c4356baSChristian Schoenebeck next = e->next; 24620c4356baSChristian Schoenebeck g_free(e->dent); 24630c4356baSChristian Schoenebeck g_free(e->st); 24640c4356baSChristian Schoenebeck g_free(e); 24650c4356baSChristian Schoenebeck } 24660c4356baSChristian Schoenebeck } 24670c4356baSChristian Schoenebeck 24688440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 24690c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 247060ce86c7SWei Liu { 247160ce86c7SWei Liu size_t size; 247260ce86c7SWei Liu V9fsQID qid; 247360ce86c7SWei Liu V9fsString name; 247460ce86c7SWei Liu int len, err = 0; 247560ce86c7SWei Liu int32_t count = 0; 24766b3b279bSKeno Fischer off_t off; 2477635324e8SGreg Kurz struct dirent *dent; 24780c4356baSChristian Schoenebeck struct stat *st; 24790c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 248060ce86c7SWei Liu 24810c4356baSChristian Schoenebeck /* 24820c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 24830c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 24840c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 24850c4356baSChristian Schoenebeck */ 24860c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 24870c4356baSChristian Schoenebeck 24880c4356baSChristian Schoenebeck /* 24890c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 24900c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 24910c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 24920c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 24930c4356baSChristian Schoenebeck */ 24940c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 24950c4356baSChristian Schoenebeck dostat); 24960c4356baSChristian Schoenebeck if (count < 0) { 24970c4356baSChristian Schoenebeck err = count; 24980c4356baSChristian Schoenebeck count = 0; 24990c4356baSChristian Schoenebeck goto out; 250060ce86c7SWei Liu } 25010c4356baSChristian Schoenebeck count = 0; 250260ce86c7SWei Liu 25030c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 25040c4356baSChristian Schoenebeck dent = e->dent; 25051a6ed33cSAntonios Motakis 25061a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 25070c4356baSChristian Schoenebeck st = e->st; 25080c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 25090c4356baSChristian Schoenebeck if (!st) { 25100c4356baSChristian Schoenebeck err = -1; 25110c4356baSChristian Schoenebeck break; 25120c4356baSChristian Schoenebeck } 25130c4356baSChristian Schoenebeck 25140c4356baSChristian Schoenebeck /* remap inode */ 25150c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 25161a6ed33cSAntonios Motakis if (err < 0) { 25170c4356baSChristian Schoenebeck break; 25181a6ed33cSAntonios Motakis } 25191a6ed33cSAntonios Motakis } else { 252060ce86c7SWei Liu /* 252160ce86c7SWei Liu * Fill up just the path field of qid because the client uses 252260ce86c7SWei Liu * only that. To fill the entire qid structure we will have 25231a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 25240c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 25251a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 25261a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 25271a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 25281a6ed33cSAntonios Motakis * files/dirs through other ways. 252960ce86c7SWei Liu */ 253060ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 253160ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 253260ce86c7SWei Liu /* Fill the other fields with dummy values */ 253360ce86c7SWei Liu qid.type = 0; 253460ce86c7SWei Liu qid.version = 0; 25351a6ed33cSAntonios Motakis } 253660ce86c7SWei Liu 25376b3b279bSKeno Fischer off = qemu_dirent_off(dent); 25380c4356baSChristian Schoenebeck v9fs_string_init(&name); 25390c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 25400c4356baSChristian Schoenebeck 254160ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 254260ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 25436b3b279bSKeno Fischer &qid, off, 254460ce86c7SWei Liu dent->d_type, &name); 25457cde47d4SGreg Kurz 25460c4356baSChristian Schoenebeck v9fs_string_free(&name); 25477cde47d4SGreg Kurz 254860ce86c7SWei Liu if (len < 0) { 25490c4356baSChristian Schoenebeck err = len; 25500c4356baSChristian Schoenebeck break; 255160ce86c7SWei Liu } 25520c4356baSChristian Schoenebeck 255360ce86c7SWei Liu count += len; 255460ce86c7SWei Liu } 25557cde47d4SGreg Kurz 25560c4356baSChristian Schoenebeck out: 25570c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 255860ce86c7SWei Liu if (err < 0) { 255960ce86c7SWei Liu return err; 256060ce86c7SWei Liu } 256160ce86c7SWei Liu return count; 256260ce86c7SWei Liu } 256360ce86c7SWei Liu 25648440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 256560ce86c7SWei Liu { 256660ce86c7SWei Liu int32_t fid; 256760ce86c7SWei Liu V9fsFidState *fidp; 256860ce86c7SWei Liu ssize_t retval = 0; 256960ce86c7SWei Liu size_t offset = 7; 257060ce86c7SWei Liu uint64_t initial_offset; 257160ce86c7SWei Liu int32_t count; 257260ce86c7SWei Liu uint32_t max_count; 257360ce86c7SWei Liu V9fsPDU *pdu = opaque; 2574d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 257560ce86c7SWei Liu 257660ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 257760ce86c7SWei Liu &initial_offset, &max_count); 257860ce86c7SWei Liu if (retval < 0) { 257960ce86c7SWei Liu goto out_nofid; 258060ce86c7SWei Liu } 258160ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 258260ce86c7SWei Liu 2583d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2584d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2585d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2586d36a5c22SChristian Schoenebeck warn_report_once( 2587d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2588d36a5c22SChristian Schoenebeck ); 2589d36a5c22SChristian Schoenebeck } 2590d36a5c22SChristian Schoenebeck 259160ce86c7SWei Liu fidp = get_fid(pdu, fid); 259260ce86c7SWei Liu if (fidp == NULL) { 259360ce86c7SWei Liu retval = -EINVAL; 259460ce86c7SWei Liu goto out_nofid; 259560ce86c7SWei Liu } 2596f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 259760ce86c7SWei Liu retval = -EINVAL; 259860ce86c7SWei Liu goto out; 259960ce86c7SWei Liu } 2600d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2601d2c5cf7cSChristian Schoenebeck warn_report_once( 2602d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2603d2c5cf7cSChristian Schoenebeck "protocol version" 2604d2c5cf7cSChristian Schoenebeck ); 2605d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2606d2c5cf7cSChristian Schoenebeck goto out; 2607d2c5cf7cSChristian Schoenebeck } 26080c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 260960ce86c7SWei Liu if (count < 0) { 261060ce86c7SWei Liu retval = count; 261160ce86c7SWei Liu goto out; 261260ce86c7SWei Liu } 261360ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 261460ce86c7SWei Liu if (retval < 0) { 261560ce86c7SWei Liu goto out; 261660ce86c7SWei Liu } 261760ce86c7SWei Liu retval += count + offset; 261860ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 261960ce86c7SWei Liu out: 262060ce86c7SWei Liu put_fid(pdu, fidp); 262160ce86c7SWei Liu out_nofid: 262260ce86c7SWei Liu pdu_complete(pdu, retval); 262360ce86c7SWei Liu } 262460ce86c7SWei Liu 262560ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 262660ce86c7SWei Liu uint64_t off, uint32_t count, 262760ce86c7SWei Liu struct iovec *sg, int cnt) 262860ce86c7SWei Liu { 262960ce86c7SWei Liu int i, to_copy; 263060ce86c7SWei Liu ssize_t err = 0; 26317e55d65cSLi Qiang uint64_t write_count; 263260ce86c7SWei Liu size_t offset = 7; 263360ce86c7SWei Liu 263460ce86c7SWei Liu 26357e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2636b858e80aSDaniel Henrique Barboza return -ENOSPC; 263760ce86c7SWei Liu } 26387e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 26397e55d65cSLi Qiang if (write_count > count) { 26407e55d65cSLi Qiang write_count = count; 26417e55d65cSLi Qiang } 264260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 264360ce86c7SWei Liu if (err < 0) { 264460ce86c7SWei Liu return err; 264560ce86c7SWei Liu } 264660ce86c7SWei Liu err += offset; 264760ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 264860ce86c7SWei Liu /* 264960ce86c7SWei Liu * Now copy the content from sg list 265060ce86c7SWei Liu */ 265160ce86c7SWei Liu for (i = 0; i < cnt; i++) { 265260ce86c7SWei Liu if (write_count > sg[i].iov_len) { 265360ce86c7SWei Liu to_copy = sg[i].iov_len; 265460ce86c7SWei Liu } else { 265560ce86c7SWei Liu to_copy = write_count; 265660ce86c7SWei Liu } 265760ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 265860ce86c7SWei Liu /* updating vs->off since we are not using below */ 265960ce86c7SWei Liu off += to_copy; 266060ce86c7SWei Liu write_count -= to_copy; 266160ce86c7SWei Liu } 2662b858e80aSDaniel Henrique Barboza 266360ce86c7SWei Liu return err; 266460ce86c7SWei Liu } 266560ce86c7SWei Liu 26668440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 266760ce86c7SWei Liu { 266860ce86c7SWei Liu ssize_t err; 266960ce86c7SWei Liu int32_t fid; 267060ce86c7SWei Liu uint64_t off; 267160ce86c7SWei Liu uint32_t count; 267260ce86c7SWei Liu int32_t len = 0; 267360ce86c7SWei Liu int32_t total = 0; 267460ce86c7SWei Liu size_t offset = 7; 267560ce86c7SWei Liu V9fsFidState *fidp; 267660ce86c7SWei Liu V9fsPDU *pdu = opaque; 267760ce86c7SWei Liu V9fsState *s = pdu->s; 267860ce86c7SWei Liu QEMUIOVector qiov_full; 267960ce86c7SWei Liu QEMUIOVector qiov; 268060ce86c7SWei Liu 268160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 268260ce86c7SWei Liu if (err < 0) { 268360ce86c7SWei Liu pdu_complete(pdu, err); 268460ce86c7SWei Liu return; 268560ce86c7SWei Liu } 268660ce86c7SWei Liu offset += err; 2687cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 268860ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 268960ce86c7SWei Liu 269060ce86c7SWei Liu fidp = get_fid(pdu, fid); 269160ce86c7SWei Liu if (fidp == NULL) { 269260ce86c7SWei Liu err = -EINVAL; 269360ce86c7SWei Liu goto out_nofid; 269460ce86c7SWei Liu } 269560ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 269660ce86c7SWei Liu if (fidp->fs.fd == -1) { 269760ce86c7SWei Liu err = -EINVAL; 269860ce86c7SWei Liu goto out; 269960ce86c7SWei Liu } 270060ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 270160ce86c7SWei Liu /* 270260ce86c7SWei Liu * setxattr operation 270360ce86c7SWei Liu */ 270460ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 270560ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 270660ce86c7SWei Liu goto out; 270760ce86c7SWei Liu } else { 270860ce86c7SWei Liu err = -EINVAL; 270960ce86c7SWei Liu goto out; 271060ce86c7SWei Liu } 271160ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 271260ce86c7SWei Liu do { 271360ce86c7SWei Liu qemu_iovec_reset(&qiov); 271460ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 271560ce86c7SWei Liu if (0) { 271660ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 271760ce86c7SWei Liu } 271860ce86c7SWei Liu /* Loop in case of EINTR */ 271960ce86c7SWei Liu do { 272060ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 272160ce86c7SWei Liu if (len >= 0) { 272260ce86c7SWei Liu off += len; 272360ce86c7SWei Liu total += len; 272460ce86c7SWei Liu } 272560ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 272660ce86c7SWei Liu if (len < 0) { 272760ce86c7SWei Liu /* IO error return the error */ 272860ce86c7SWei Liu err = len; 272960ce86c7SWei Liu goto out_qiov; 273060ce86c7SWei Liu } 273160ce86c7SWei Liu } while (total < count && len > 0); 273260ce86c7SWei Liu 273360ce86c7SWei Liu offset = 7; 273460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 273560ce86c7SWei Liu if (err < 0) { 2736fdfcc9aeSLi Qiang goto out_qiov; 273760ce86c7SWei Liu } 273860ce86c7SWei Liu err += offset; 273960ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 274060ce86c7SWei Liu out_qiov: 274160ce86c7SWei Liu qemu_iovec_destroy(&qiov); 274260ce86c7SWei Liu out: 274360ce86c7SWei Liu put_fid(pdu, fidp); 274460ce86c7SWei Liu out_nofid: 274560ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 274660ce86c7SWei Liu pdu_complete(pdu, err); 274760ce86c7SWei Liu } 274860ce86c7SWei Liu 27498440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 275060ce86c7SWei Liu { 275160ce86c7SWei Liu int32_t fid; 275260ce86c7SWei Liu int err = 0; 275360ce86c7SWei Liu size_t offset = 7; 275460ce86c7SWei Liu V9fsFidState *fidp; 275560ce86c7SWei Liu V9fsQID qid; 275660ce86c7SWei Liu int32_t perm; 275760ce86c7SWei Liu int8_t mode; 275860ce86c7SWei Liu V9fsPath path; 275960ce86c7SWei Liu struct stat stbuf; 276060ce86c7SWei Liu V9fsString name; 276160ce86c7SWei Liu V9fsString extension; 276260ce86c7SWei Liu int iounit; 276360ce86c7SWei Liu V9fsPDU *pdu = opaque; 27645b3c77aaSGreg Kurz V9fsState *s = pdu->s; 276560ce86c7SWei Liu 276660ce86c7SWei Liu v9fs_path_init(&path); 276760ce86c7SWei Liu v9fs_string_init(&name); 276860ce86c7SWei Liu v9fs_string_init(&extension); 276960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 277060ce86c7SWei Liu &perm, &mode, &extension); 277160ce86c7SWei Liu if (err < 0) { 277260ce86c7SWei Liu goto out_nofid; 277360ce86c7SWei Liu } 277460ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 277560ce86c7SWei Liu 2776fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2777fff39a7aSGreg Kurz err = -ENOENT; 2778fff39a7aSGreg Kurz goto out_nofid; 2779fff39a7aSGreg Kurz } 2780fff39a7aSGreg Kurz 2781805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2782805b5d98SGreg Kurz err = -EEXIST; 2783805b5d98SGreg Kurz goto out_nofid; 2784805b5d98SGreg Kurz } 2785805b5d98SGreg Kurz 278660ce86c7SWei Liu fidp = get_fid(pdu, fid); 278760ce86c7SWei Liu if (fidp == NULL) { 278860ce86c7SWei Liu err = -EINVAL; 278960ce86c7SWei Liu goto out_nofid; 279060ce86c7SWei Liu } 2791d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2792d63fb193SLi Qiang err = -EINVAL; 2793d63fb193SLi Qiang goto out; 2794d63fb193SLi Qiang } 279560ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 279660ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 279760ce86c7SWei Liu fidp->uid, -1, &stbuf); 279860ce86c7SWei Liu if (err < 0) { 279960ce86c7SWei Liu goto out; 280060ce86c7SWei Liu } 280160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 280260ce86c7SWei Liu if (err < 0) { 280360ce86c7SWei Liu goto out; 280460ce86c7SWei Liu } 28055b3c77aaSGreg Kurz v9fs_path_write_lock(s); 280660ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28075b3c77aaSGreg Kurz v9fs_path_unlock(s); 280860ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 280960ce86c7SWei Liu if (err < 0) { 281060ce86c7SWei Liu goto out; 281160ce86c7SWei Liu } 281260ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 281360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 281460ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 281560ce86c7SWei Liu extension.data, -1 , &stbuf); 281660ce86c7SWei Liu if (err < 0) { 281760ce86c7SWei Liu goto out; 281860ce86c7SWei Liu } 281960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 282060ce86c7SWei Liu if (err < 0) { 282160ce86c7SWei Liu goto out; 282260ce86c7SWei Liu } 28235b3c77aaSGreg Kurz v9fs_path_write_lock(s); 282460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28255b3c77aaSGreg Kurz v9fs_path_unlock(s); 282660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 282760ce86c7SWei Liu int32_t ofid = atoi(extension.data); 282860ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 282960ce86c7SWei Liu if (ofidp == NULL) { 283060ce86c7SWei Liu err = -EINVAL; 283160ce86c7SWei Liu goto out; 283260ce86c7SWei Liu } 283360ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 283460ce86c7SWei Liu put_fid(pdu, ofidp); 283560ce86c7SWei Liu if (err < 0) { 283660ce86c7SWei Liu goto out; 283760ce86c7SWei Liu } 283860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 283960ce86c7SWei Liu if (err < 0) { 284060ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 284160ce86c7SWei Liu goto out; 284260ce86c7SWei Liu } 28435b3c77aaSGreg Kurz v9fs_path_write_lock(s); 284460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28455b3c77aaSGreg Kurz v9fs_path_unlock(s); 284660ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 284760ce86c7SWei Liu if (err < 0) { 284860ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 284960ce86c7SWei Liu goto out; 285060ce86c7SWei Liu } 285160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 285260ce86c7SWei Liu char ctype; 285360ce86c7SWei Liu uint32_t major, minor; 285460ce86c7SWei Liu mode_t nmode = 0; 285560ce86c7SWei Liu 285660ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 285760ce86c7SWei Liu err = -errno; 285860ce86c7SWei Liu goto out; 285960ce86c7SWei Liu } 286060ce86c7SWei Liu 286160ce86c7SWei Liu switch (ctype) { 286260ce86c7SWei Liu case 'c': 286360ce86c7SWei Liu nmode = S_IFCHR; 286460ce86c7SWei Liu break; 286560ce86c7SWei Liu case 'b': 286660ce86c7SWei Liu nmode = S_IFBLK; 286760ce86c7SWei Liu break; 286860ce86c7SWei Liu default: 286960ce86c7SWei Liu err = -EIO; 287060ce86c7SWei Liu goto out; 287160ce86c7SWei Liu } 287260ce86c7SWei Liu 287360ce86c7SWei Liu nmode |= perm & 0777; 287460ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 287560ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 287660ce86c7SWei Liu if (err < 0) { 287760ce86c7SWei Liu goto out; 287860ce86c7SWei Liu } 287960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 288060ce86c7SWei Liu if (err < 0) { 288160ce86c7SWei Liu goto out; 288260ce86c7SWei Liu } 28835b3c77aaSGreg Kurz v9fs_path_write_lock(s); 288460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28855b3c77aaSGreg Kurz v9fs_path_unlock(s); 288660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 288760ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 288860ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 288960ce86c7SWei Liu if (err < 0) { 289060ce86c7SWei Liu goto out; 289160ce86c7SWei Liu } 289260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 289360ce86c7SWei Liu if (err < 0) { 289460ce86c7SWei Liu goto out; 289560ce86c7SWei Liu } 28965b3c77aaSGreg Kurz v9fs_path_write_lock(s); 289760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28985b3c77aaSGreg Kurz v9fs_path_unlock(s); 289960ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 290060ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 290160ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 290260ce86c7SWei Liu if (err < 0) { 290360ce86c7SWei Liu goto out; 290460ce86c7SWei Liu } 290560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 290660ce86c7SWei Liu if (err < 0) { 290760ce86c7SWei Liu goto out; 290860ce86c7SWei Liu } 29095b3c77aaSGreg Kurz v9fs_path_write_lock(s); 291060ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 29115b3c77aaSGreg Kurz v9fs_path_unlock(s); 291260ce86c7SWei Liu } else { 291360ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 291460ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 291560ce86c7SWei Liu if (err < 0) { 291660ce86c7SWei Liu goto out; 291760ce86c7SWei Liu } 291860ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 291960ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 292060ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 292160ce86c7SWei Liu /* 292260ce86c7SWei Liu * We let the host file system do O_EXCL check 292360ce86c7SWei Liu * We should not reclaim such fd 292460ce86c7SWei Liu */ 292560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 292660ce86c7SWei Liu } 292760ce86c7SWei Liu } 292860ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 29293b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 29303b5ee9e8SAntonios Motakis if (err < 0) { 29313b5ee9e8SAntonios Motakis goto out; 29323b5ee9e8SAntonios Motakis } 293360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 293460ce86c7SWei Liu if (err < 0) { 293560ce86c7SWei Liu goto out; 293660ce86c7SWei Liu } 293760ce86c7SWei Liu err += offset; 293860ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 293960ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 294060ce86c7SWei Liu out: 294160ce86c7SWei Liu put_fid(pdu, fidp); 294260ce86c7SWei Liu out_nofid: 294360ce86c7SWei Liu pdu_complete(pdu, err); 294460ce86c7SWei Liu v9fs_string_free(&name); 294560ce86c7SWei Liu v9fs_string_free(&extension); 294660ce86c7SWei Liu v9fs_path_free(&path); 294760ce86c7SWei Liu } 294860ce86c7SWei Liu 29498440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 295060ce86c7SWei Liu { 295160ce86c7SWei Liu V9fsPDU *pdu = opaque; 295260ce86c7SWei Liu V9fsString name; 295360ce86c7SWei Liu V9fsString symname; 295460ce86c7SWei Liu V9fsFidState *dfidp; 295560ce86c7SWei Liu V9fsQID qid; 295660ce86c7SWei Liu struct stat stbuf; 295760ce86c7SWei Liu int32_t dfid; 295860ce86c7SWei Liu int err = 0; 295960ce86c7SWei Liu gid_t gid; 296060ce86c7SWei Liu size_t offset = 7; 296160ce86c7SWei Liu 296260ce86c7SWei Liu v9fs_string_init(&name); 296360ce86c7SWei Liu v9fs_string_init(&symname); 296460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 296560ce86c7SWei Liu if (err < 0) { 296660ce86c7SWei Liu goto out_nofid; 296760ce86c7SWei Liu } 296860ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 296960ce86c7SWei Liu 2970fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2971fff39a7aSGreg Kurz err = -ENOENT; 2972fff39a7aSGreg Kurz goto out_nofid; 2973fff39a7aSGreg Kurz } 2974fff39a7aSGreg Kurz 2975805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2976805b5d98SGreg Kurz err = -EEXIST; 2977805b5d98SGreg Kurz goto out_nofid; 2978805b5d98SGreg Kurz } 2979805b5d98SGreg Kurz 298060ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 298160ce86c7SWei Liu if (dfidp == NULL) { 298260ce86c7SWei Liu err = -EINVAL; 298360ce86c7SWei Liu goto out_nofid; 298460ce86c7SWei Liu } 298560ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 298660ce86c7SWei Liu if (err < 0) { 298760ce86c7SWei Liu goto out; 298860ce86c7SWei Liu } 29893b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 29903b5ee9e8SAntonios Motakis if (err < 0) { 29913b5ee9e8SAntonios Motakis goto out; 29923b5ee9e8SAntonios Motakis } 299360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 299460ce86c7SWei Liu if (err < 0) { 299560ce86c7SWei Liu goto out; 299660ce86c7SWei Liu } 299760ce86c7SWei Liu err += offset; 299860ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 299960ce86c7SWei Liu qid.type, qid.version, qid.path); 300060ce86c7SWei Liu out: 300160ce86c7SWei Liu put_fid(pdu, dfidp); 300260ce86c7SWei Liu out_nofid: 300360ce86c7SWei Liu pdu_complete(pdu, err); 300460ce86c7SWei Liu v9fs_string_free(&name); 300560ce86c7SWei Liu v9fs_string_free(&symname); 300660ce86c7SWei Liu } 300760ce86c7SWei Liu 3008a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 300960ce86c7SWei Liu { 301060ce86c7SWei Liu ssize_t err; 301160ce86c7SWei Liu int16_t tag; 301260ce86c7SWei Liu size_t offset = 7; 3013d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 301460ce86c7SWei Liu V9fsPDU *pdu = opaque; 301560ce86c7SWei Liu V9fsState *s = pdu->s; 301660ce86c7SWei Liu 301760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 301860ce86c7SWei Liu if (err < 0) { 301960ce86c7SWei Liu pdu_complete(pdu, err); 302060ce86c7SWei Liu return; 302160ce86c7SWei Liu } 302260ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 302360ce86c7SWei Liu 3024d5f2af7bSGreg Kurz if (pdu->tag == tag) { 30253dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 3026d5f2af7bSGreg Kurz } else { 302760ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 302860ce86c7SWei Liu if (cancel_pdu->tag == tag) { 302960ce86c7SWei Liu break; 303060ce86c7SWei Liu } 303160ce86c7SWei Liu } 3032d5f2af7bSGreg Kurz } 303360ce86c7SWei Liu if (cancel_pdu) { 303460ce86c7SWei Liu cancel_pdu->cancelled = 1; 303560ce86c7SWei Liu /* 303660ce86c7SWei Liu * Wait for pdu to complete. 303760ce86c7SWei Liu */ 30381ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 303918adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 304060ce86c7SWei Liu cancel_pdu->cancelled = 0; 304160ce86c7SWei Liu pdu_free(cancel_pdu); 304260ce86c7SWei Liu } 304318adde86SGreg Kurz } 304460ce86c7SWei Liu pdu_complete(pdu, 7); 304560ce86c7SWei Liu } 304660ce86c7SWei Liu 30478440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 304860ce86c7SWei Liu { 304960ce86c7SWei Liu V9fsPDU *pdu = opaque; 305060ce86c7SWei Liu int32_t dfid, oldfid; 305160ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 305260ce86c7SWei Liu V9fsString name; 305360ce86c7SWei Liu size_t offset = 7; 305460ce86c7SWei Liu int err = 0; 305560ce86c7SWei Liu 305660ce86c7SWei Liu v9fs_string_init(&name); 305760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 305860ce86c7SWei Liu if (err < 0) { 305960ce86c7SWei Liu goto out_nofid; 306060ce86c7SWei Liu } 306160ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 306260ce86c7SWei Liu 3063fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3064fff39a7aSGreg Kurz err = -ENOENT; 3065fff39a7aSGreg Kurz goto out_nofid; 3066fff39a7aSGreg Kurz } 3067fff39a7aSGreg Kurz 3068805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3069805b5d98SGreg Kurz err = -EEXIST; 3070805b5d98SGreg Kurz goto out_nofid; 3071805b5d98SGreg Kurz } 3072805b5d98SGreg Kurz 307360ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 307460ce86c7SWei Liu if (dfidp == NULL) { 307560ce86c7SWei Liu err = -ENOENT; 307660ce86c7SWei Liu goto out_nofid; 307760ce86c7SWei Liu } 307860ce86c7SWei Liu 307960ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 308060ce86c7SWei Liu if (oldfidp == NULL) { 308160ce86c7SWei Liu err = -ENOENT; 308260ce86c7SWei Liu goto out; 308360ce86c7SWei Liu } 308460ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 308560ce86c7SWei Liu if (!err) { 308660ce86c7SWei Liu err = offset; 308760ce86c7SWei Liu } 30884c158678SLi Qiang put_fid(pdu, oldfidp); 308960ce86c7SWei Liu out: 309060ce86c7SWei Liu put_fid(pdu, dfidp); 309160ce86c7SWei Liu out_nofid: 309260ce86c7SWei Liu v9fs_string_free(&name); 309360ce86c7SWei Liu pdu_complete(pdu, err); 309460ce86c7SWei Liu } 309560ce86c7SWei Liu 309660ce86c7SWei Liu /* Only works with path name based fid */ 30978440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 309860ce86c7SWei Liu { 309960ce86c7SWei Liu int32_t fid; 310060ce86c7SWei Liu int err = 0; 310160ce86c7SWei Liu size_t offset = 7; 310260ce86c7SWei Liu V9fsFidState *fidp; 310360ce86c7SWei Liu V9fsPDU *pdu = opaque; 310460ce86c7SWei Liu 310560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 310660ce86c7SWei Liu if (err < 0) { 310760ce86c7SWei Liu goto out_nofid; 310860ce86c7SWei Liu } 310960ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 311060ce86c7SWei Liu 311160ce86c7SWei Liu fidp = get_fid(pdu, fid); 311260ce86c7SWei Liu if (fidp == NULL) { 311360ce86c7SWei Liu err = -EINVAL; 311460ce86c7SWei Liu goto out_nofid; 311560ce86c7SWei Liu } 311660ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 311760ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 311860ce86c7SWei Liu err = -EOPNOTSUPP; 311960ce86c7SWei Liu goto out_err; 312060ce86c7SWei Liu } 312160ce86c7SWei Liu /* 312260ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 312360ce86c7SWei Liu * the file later. So don't reclaim fd 312460ce86c7SWei Liu */ 312560ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 312660ce86c7SWei Liu if (err < 0) { 312760ce86c7SWei Liu goto out_err; 312860ce86c7SWei Liu } 312960ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 313060ce86c7SWei Liu if (!err) { 313160ce86c7SWei Liu err = offset; 313260ce86c7SWei Liu } 313360ce86c7SWei Liu out_err: 313460ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 313560ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 313660ce86c7SWei Liu put_fid(pdu, fidp); 313760ce86c7SWei Liu out_nofid: 313860ce86c7SWei Liu pdu_complete(pdu, err); 313960ce86c7SWei Liu } 314060ce86c7SWei Liu 31418440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 314260ce86c7SWei Liu { 314360ce86c7SWei Liu int err = 0; 314460ce86c7SWei Liu V9fsString name; 314567e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 314660ce86c7SWei Liu size_t offset = 7; 314760ce86c7SWei Liu V9fsPath path; 314860ce86c7SWei Liu V9fsFidState *dfidp; 314960ce86c7SWei Liu V9fsPDU *pdu = opaque; 315060ce86c7SWei Liu 315160ce86c7SWei Liu v9fs_string_init(&name); 315260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 315360ce86c7SWei Liu if (err < 0) { 315460ce86c7SWei Liu goto out_nofid; 315560ce86c7SWei Liu } 3156fff39a7aSGreg Kurz 3157fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3158fff39a7aSGreg Kurz err = -ENOENT; 3159fff39a7aSGreg Kurz goto out_nofid; 3160fff39a7aSGreg Kurz } 3161fff39a7aSGreg Kurz 3162805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3163805b5d98SGreg Kurz err = -EINVAL; 3164805b5d98SGreg Kurz goto out_nofid; 3165805b5d98SGreg Kurz } 3166805b5d98SGreg Kurz 3167805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3168805b5d98SGreg Kurz err = -ENOTEMPTY; 3169805b5d98SGreg Kurz goto out_nofid; 3170805b5d98SGreg Kurz } 3171805b5d98SGreg Kurz 317267e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 317367e87345SKeno Fischer err = -EINVAL; 317467e87345SKeno Fischer goto out_nofid; 317567e87345SKeno Fischer } 317667e87345SKeno Fischer 317767e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 317867e87345SKeno Fischer rflags |= AT_REMOVEDIR; 317967e87345SKeno Fischer } 318067e87345SKeno Fischer 318160ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 318260ce86c7SWei Liu if (dfidp == NULL) { 318360ce86c7SWei Liu err = -EINVAL; 318460ce86c7SWei Liu goto out_nofid; 318560ce86c7SWei Liu } 318660ce86c7SWei Liu /* 318760ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 318860ce86c7SWei Liu * the file later. So don't reclaim fd 318960ce86c7SWei Liu */ 319060ce86c7SWei Liu v9fs_path_init(&path); 319160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 319260ce86c7SWei Liu if (err < 0) { 319360ce86c7SWei Liu goto out_err; 319460ce86c7SWei Liu } 319560ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 319660ce86c7SWei Liu if (err < 0) { 319760ce86c7SWei Liu goto out_err; 319860ce86c7SWei Liu } 319967e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 320060ce86c7SWei Liu if (!err) { 320160ce86c7SWei Liu err = offset; 320260ce86c7SWei Liu } 320360ce86c7SWei Liu out_err: 320460ce86c7SWei Liu put_fid(pdu, dfidp); 320560ce86c7SWei Liu v9fs_path_free(&path); 320660ce86c7SWei Liu out_nofid: 320760ce86c7SWei Liu pdu_complete(pdu, err); 320860ce86c7SWei Liu v9fs_string_free(&name); 320960ce86c7SWei Liu } 321060ce86c7SWei Liu 321160ce86c7SWei Liu 321260ce86c7SWei Liu /* Only works with path name based fid */ 32138440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 32148440e22eSGreg Kurz int32_t newdirfid, 32158440e22eSGreg Kurz V9fsString *name) 321660ce86c7SWei Liu { 321760ce86c7SWei Liu int err = 0; 321860ce86c7SWei Liu V9fsPath new_path; 321960ce86c7SWei Liu V9fsFidState *tfidp; 322060ce86c7SWei Liu V9fsState *s = pdu->s; 322160ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 3222f5265c8fSLinus Heckemann GHashTableIter iter; 3223f5265c8fSLinus Heckemann gpointer fid; 322460ce86c7SWei Liu 322560ce86c7SWei Liu v9fs_path_init(&new_path); 322660ce86c7SWei Liu if (newdirfid != -1) { 322760ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 322860ce86c7SWei Liu if (dirfidp == NULL) { 3229b858e80aSDaniel Henrique Barboza return -ENOENT; 323060ce86c7SWei Liu } 323149dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 323249dd946bSGreg Kurz err = -EINVAL; 323349dd946bSGreg Kurz goto out; 323449dd946bSGreg Kurz } 32354fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 32364fa62005SGreg Kurz if (err < 0) { 32374fa62005SGreg Kurz goto out; 32384fa62005SGreg Kurz } 323960ce86c7SWei Liu } else { 32404d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 32414d8bc733SJan Dakinevich V9fsPath dir_path; 32424d8bc733SJan Dakinevich 32434d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 32444d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 32454d8bc733SJan Dakinevich g_free(dir_name); 32464d8bc733SJan Dakinevich 32474d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 32484d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 32494fa62005SGreg Kurz if (err < 0) { 32504fa62005SGreg Kurz goto out; 32514fa62005SGreg Kurz } 325260ce86c7SWei Liu } 325360ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 325460ce86c7SWei Liu if (err < 0) { 325560ce86c7SWei Liu goto out; 325660ce86c7SWei Liu } 3257f5265c8fSLinus Heckemann 325860ce86c7SWei Liu /* 325960ce86c7SWei Liu * Fixup fid's pointing to the old name to 326060ce86c7SWei Liu * start pointing to the new name 326160ce86c7SWei Liu */ 3262f5265c8fSLinus Heckemann g_hash_table_iter_init(&iter, s->fids); 3263f5265c8fSLinus Heckemann while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &tfidp)) { 326460ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 326560ce86c7SWei Liu /* replace the name */ 326660ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 326760ce86c7SWei Liu } 326860ce86c7SWei Liu } 326960ce86c7SWei Liu out: 327060ce86c7SWei Liu if (dirfidp) { 327160ce86c7SWei Liu put_fid(pdu, dirfidp); 327260ce86c7SWei Liu } 327360ce86c7SWei Liu v9fs_path_free(&new_path); 327460ce86c7SWei Liu return err; 327560ce86c7SWei Liu } 327660ce86c7SWei Liu 327760ce86c7SWei Liu /* Only works with path name based fid */ 32788440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 327960ce86c7SWei Liu { 328060ce86c7SWei Liu int32_t fid; 328160ce86c7SWei Liu ssize_t err = 0; 328260ce86c7SWei Liu size_t offset = 7; 328360ce86c7SWei Liu V9fsString name; 328460ce86c7SWei Liu int32_t newdirfid; 328560ce86c7SWei Liu V9fsFidState *fidp; 328660ce86c7SWei Liu V9fsPDU *pdu = opaque; 328760ce86c7SWei Liu V9fsState *s = pdu->s; 328860ce86c7SWei Liu 328960ce86c7SWei Liu v9fs_string_init(&name); 329060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 329160ce86c7SWei Liu if (err < 0) { 329260ce86c7SWei Liu goto out_nofid; 329360ce86c7SWei Liu } 3294fff39a7aSGreg Kurz 3295fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3296fff39a7aSGreg Kurz err = -ENOENT; 3297fff39a7aSGreg Kurz goto out_nofid; 3298fff39a7aSGreg Kurz } 3299fff39a7aSGreg Kurz 3300805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3301805b5d98SGreg Kurz err = -EISDIR; 3302805b5d98SGreg Kurz goto out_nofid; 3303805b5d98SGreg Kurz } 3304805b5d98SGreg Kurz 330560ce86c7SWei Liu fidp = get_fid(pdu, fid); 330660ce86c7SWei Liu if (fidp == NULL) { 330760ce86c7SWei Liu err = -ENOENT; 330860ce86c7SWei Liu goto out_nofid; 330960ce86c7SWei Liu } 331049dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 331149dd946bSGreg Kurz err = -EINVAL; 331249dd946bSGreg Kurz goto out; 331349dd946bSGreg Kurz } 331460ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 331560ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 331660ce86c7SWei Liu err = -EOPNOTSUPP; 331760ce86c7SWei Liu goto out; 331860ce86c7SWei Liu } 331960ce86c7SWei Liu v9fs_path_write_lock(s); 332060ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 332160ce86c7SWei Liu v9fs_path_unlock(s); 332260ce86c7SWei Liu if (!err) { 332360ce86c7SWei Liu err = offset; 332460ce86c7SWei Liu } 332560ce86c7SWei Liu out: 332660ce86c7SWei Liu put_fid(pdu, fidp); 332760ce86c7SWei Liu out_nofid: 332860ce86c7SWei Liu pdu_complete(pdu, err); 332960ce86c7SWei Liu v9fs_string_free(&name); 333060ce86c7SWei Liu } 333160ce86c7SWei Liu 33324fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 33338440e22eSGreg Kurz V9fsString *old_name, 33348440e22eSGreg Kurz V9fsPath *newdir, 333560ce86c7SWei Liu V9fsString *new_name) 333660ce86c7SWei Liu { 333760ce86c7SWei Liu V9fsFidState *tfidp; 333860ce86c7SWei Liu V9fsPath oldpath, newpath; 333960ce86c7SWei Liu V9fsState *s = pdu->s; 33404fa62005SGreg Kurz int err; 3341f5265c8fSLinus Heckemann GHashTableIter iter; 3342f5265c8fSLinus Heckemann gpointer fid; 334360ce86c7SWei Liu 334460ce86c7SWei Liu v9fs_path_init(&oldpath); 334560ce86c7SWei Liu v9fs_path_init(&newpath); 33464fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 33474fa62005SGreg Kurz if (err < 0) { 33484fa62005SGreg Kurz goto out; 33494fa62005SGreg Kurz } 33504fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 33514fa62005SGreg Kurz if (err < 0) { 33524fa62005SGreg Kurz goto out; 33534fa62005SGreg Kurz } 335460ce86c7SWei Liu 335560ce86c7SWei Liu /* 335660ce86c7SWei Liu * Fixup fid's pointing to the old name to 335760ce86c7SWei Liu * start pointing to the new name 335860ce86c7SWei Liu */ 3359f5265c8fSLinus Heckemann g_hash_table_iter_init(&iter, s->fids); 3360f5265c8fSLinus Heckemann while (g_hash_table_iter_next(&iter, &fid, (gpointer *) &tfidp)) { 336160ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 336260ce86c7SWei Liu /* replace the name */ 336360ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 336460ce86c7SWei Liu } 336560ce86c7SWei Liu } 33664fa62005SGreg Kurz out: 336760ce86c7SWei Liu v9fs_path_free(&oldpath); 336860ce86c7SWei Liu v9fs_path_free(&newpath); 33694fa62005SGreg Kurz return err; 337060ce86c7SWei Liu } 337160ce86c7SWei Liu 33728440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 33738440e22eSGreg Kurz V9fsString *old_name, 33748440e22eSGreg Kurz int32_t newdirfid, 337560ce86c7SWei Liu V9fsString *new_name) 337660ce86c7SWei Liu { 337760ce86c7SWei Liu int err = 0; 337860ce86c7SWei Liu V9fsState *s = pdu->s; 337960ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 338060ce86c7SWei Liu 338160ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 338260ce86c7SWei Liu if (olddirfidp == NULL) { 338360ce86c7SWei Liu err = -ENOENT; 338460ce86c7SWei Liu goto out; 338560ce86c7SWei Liu } 338660ce86c7SWei Liu if (newdirfid != -1) { 338760ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 338860ce86c7SWei Liu if (newdirfidp == NULL) { 338960ce86c7SWei Liu err = -ENOENT; 339060ce86c7SWei Liu goto out; 339160ce86c7SWei Liu } 339260ce86c7SWei Liu } else { 339360ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 339460ce86c7SWei Liu } 339560ce86c7SWei Liu 339660ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 339760ce86c7SWei Liu &newdirfidp->path, new_name); 339860ce86c7SWei Liu if (err < 0) { 339960ce86c7SWei Liu goto out; 340060ce86c7SWei Liu } 340160ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 340260ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 34034fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 340460ce86c7SWei Liu &newdirfidp->path, new_name); 340560ce86c7SWei Liu } 340660ce86c7SWei Liu out: 340760ce86c7SWei Liu if (olddirfidp) { 340860ce86c7SWei Liu put_fid(pdu, olddirfidp); 340960ce86c7SWei Liu } 341060ce86c7SWei Liu if (newdirfidp) { 341160ce86c7SWei Liu put_fid(pdu, newdirfidp); 341260ce86c7SWei Liu } 341360ce86c7SWei Liu return err; 341460ce86c7SWei Liu } 341560ce86c7SWei Liu 34168440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 341760ce86c7SWei Liu { 341860ce86c7SWei Liu ssize_t err = 0; 341960ce86c7SWei Liu size_t offset = 7; 342060ce86c7SWei Liu V9fsPDU *pdu = opaque; 342160ce86c7SWei Liu V9fsState *s = pdu->s; 342260ce86c7SWei Liu int32_t olddirfid, newdirfid; 342360ce86c7SWei Liu V9fsString old_name, new_name; 342460ce86c7SWei Liu 342560ce86c7SWei Liu v9fs_string_init(&old_name); 342660ce86c7SWei Liu v9fs_string_init(&new_name); 342760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 342860ce86c7SWei Liu &old_name, &newdirfid, &new_name); 342960ce86c7SWei Liu if (err < 0) { 343060ce86c7SWei Liu goto out_err; 343160ce86c7SWei Liu } 343260ce86c7SWei Liu 3433fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3434fff39a7aSGreg Kurz err = -ENOENT; 3435fff39a7aSGreg Kurz goto out_err; 3436fff39a7aSGreg Kurz } 3437fff39a7aSGreg Kurz 3438805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3439805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3440805b5d98SGreg Kurz err = -EISDIR; 3441805b5d98SGreg Kurz goto out_err; 3442805b5d98SGreg Kurz } 3443805b5d98SGreg Kurz 344460ce86c7SWei Liu v9fs_path_write_lock(s); 344560ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 344660ce86c7SWei Liu &old_name, newdirfid, &new_name); 344760ce86c7SWei Liu v9fs_path_unlock(s); 344860ce86c7SWei Liu if (!err) { 344960ce86c7SWei Liu err = offset; 345060ce86c7SWei Liu } 345160ce86c7SWei Liu 345260ce86c7SWei Liu out_err: 345360ce86c7SWei Liu pdu_complete(pdu, err); 345460ce86c7SWei Liu v9fs_string_free(&old_name); 345560ce86c7SWei Liu v9fs_string_free(&new_name); 345660ce86c7SWei Liu } 345760ce86c7SWei Liu 34588440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 345960ce86c7SWei Liu { 346060ce86c7SWei Liu int32_t fid; 346160ce86c7SWei Liu int err = 0; 346260ce86c7SWei Liu int16_t unused; 346360ce86c7SWei Liu V9fsStat v9stat; 346460ce86c7SWei Liu size_t offset = 7; 346560ce86c7SWei Liu struct stat stbuf; 346660ce86c7SWei Liu V9fsFidState *fidp; 346760ce86c7SWei Liu V9fsPDU *pdu = opaque; 34681d203986SGreg Kurz V9fsState *s = pdu->s; 346960ce86c7SWei Liu 347060ce86c7SWei Liu v9fs_stat_init(&v9stat); 347160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 347260ce86c7SWei Liu if (err < 0) { 347360ce86c7SWei Liu goto out_nofid; 347460ce86c7SWei Liu } 347560ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 347660ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 347760ce86c7SWei Liu 347860ce86c7SWei Liu fidp = get_fid(pdu, fid); 347960ce86c7SWei Liu if (fidp == NULL) { 348060ce86c7SWei Liu err = -EINVAL; 348160ce86c7SWei Liu goto out_nofid; 348260ce86c7SWei Liu } 348360ce86c7SWei Liu /* do we need to sync the file? */ 348460ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 348560ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 348660ce86c7SWei Liu goto out; 348760ce86c7SWei Liu } 348860ce86c7SWei Liu if (v9stat.mode != -1) { 348960ce86c7SWei Liu uint32_t v9_mode; 349060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 349160ce86c7SWei Liu if (err < 0) { 349260ce86c7SWei Liu goto out; 349360ce86c7SWei Liu } 349460ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 349560ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 349660ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 349760ce86c7SWei Liu /* Attempting to change the type */ 349860ce86c7SWei Liu err = -EIO; 349960ce86c7SWei Liu goto out; 350060ce86c7SWei Liu } 350160ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 350260ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 350360ce86c7SWei Liu &v9stat.extension)); 350460ce86c7SWei Liu if (err < 0) { 350560ce86c7SWei Liu goto out; 350660ce86c7SWei Liu } 350760ce86c7SWei Liu } 350860ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 350960ce86c7SWei Liu struct timespec times[2]; 351060ce86c7SWei Liu if (v9stat.atime != -1) { 351160ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 351260ce86c7SWei Liu times[0].tv_nsec = 0; 351360ce86c7SWei Liu } else { 351460ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 351560ce86c7SWei Liu } 351660ce86c7SWei Liu if (v9stat.mtime != -1) { 351760ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 351860ce86c7SWei Liu times[1].tv_nsec = 0; 351960ce86c7SWei Liu } else { 352060ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 352160ce86c7SWei Liu } 352260ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 352360ce86c7SWei Liu if (err < 0) { 352460ce86c7SWei Liu goto out; 352560ce86c7SWei Liu } 352660ce86c7SWei Liu } 352760ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 352860ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 352960ce86c7SWei Liu if (err < 0) { 353060ce86c7SWei Liu goto out; 353160ce86c7SWei Liu } 353260ce86c7SWei Liu } 353360ce86c7SWei Liu if (v9stat.name.size != 0) { 35341d203986SGreg Kurz v9fs_path_write_lock(s); 353560ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 35361d203986SGreg Kurz v9fs_path_unlock(s); 353760ce86c7SWei Liu if (err < 0) { 353860ce86c7SWei Liu goto out; 353960ce86c7SWei Liu } 354060ce86c7SWei Liu } 354160ce86c7SWei Liu if (v9stat.length != -1) { 354260ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 354360ce86c7SWei Liu if (err < 0) { 354460ce86c7SWei Liu goto out; 354560ce86c7SWei Liu } 354660ce86c7SWei Liu } 354760ce86c7SWei Liu err = offset; 354860ce86c7SWei Liu out: 354960ce86c7SWei Liu put_fid(pdu, fidp); 355060ce86c7SWei Liu out_nofid: 355160ce86c7SWei Liu v9fs_stat_free(&v9stat); 355260ce86c7SWei Liu pdu_complete(pdu, err); 355360ce86c7SWei Liu } 355460ce86c7SWei Liu 355560ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 355660ce86c7SWei Liu { 355760ce86c7SWei Liu uint32_t f_type; 355860ce86c7SWei Liu uint32_t f_bsize; 355960ce86c7SWei Liu uint64_t f_blocks; 356060ce86c7SWei Liu uint64_t f_bfree; 356160ce86c7SWei Liu uint64_t f_bavail; 356260ce86c7SWei Liu uint64_t f_files; 356360ce86c7SWei Liu uint64_t f_ffree; 356460ce86c7SWei Liu uint64_t fsid_val; 356560ce86c7SWei Liu uint32_t f_namelen; 356660ce86c7SWei Liu size_t offset = 7; 356760ce86c7SWei Liu int32_t bsize_factor; 356860ce86c7SWei Liu 356960ce86c7SWei Liu /* 357060ce86c7SWei Liu * compute bsize factor based on host file system block size 357160ce86c7SWei Liu * and client msize 357260ce86c7SWei Liu */ 357360ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 357460ce86c7SWei Liu if (!bsize_factor) { 357560ce86c7SWei Liu bsize_factor = 1; 357660ce86c7SWei Liu } 357760ce86c7SWei Liu f_type = stbuf->f_type; 357860ce86c7SWei Liu f_bsize = stbuf->f_bsize; 357960ce86c7SWei Liu f_bsize *= bsize_factor; 358060ce86c7SWei Liu /* 358160ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 358260ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 358360ce86c7SWei Liu * blocks by bsize factor 358460ce86c7SWei Liu */ 358560ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 358660ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 358760ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 358860ce86c7SWei Liu f_files = stbuf->f_files; 358960ce86c7SWei Liu f_ffree = stbuf->f_ffree; 3590f41db099SKeno Fischer #ifdef CONFIG_DARWIN 3591f41db099SKeno Fischer fsid_val = (unsigned int)stbuf->f_fsid.val[0] | 3592f41db099SKeno Fischer (unsigned long long)stbuf->f_fsid.val[1] << 32; 3593f41db099SKeno Fischer f_namelen = NAME_MAX; 3594f41db099SKeno Fischer #else 359560ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 359660ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 359760ce86c7SWei Liu f_namelen = stbuf->f_namelen; 3598f41db099SKeno Fischer #endif 359960ce86c7SWei Liu 360060ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 360160ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 360260ce86c7SWei Liu f_bavail, f_files, f_ffree, 360360ce86c7SWei Liu fsid_val, f_namelen); 360460ce86c7SWei Liu } 360560ce86c7SWei Liu 36068440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 360760ce86c7SWei Liu { 360860ce86c7SWei Liu int32_t fid; 360960ce86c7SWei Liu ssize_t retval = 0; 361060ce86c7SWei Liu size_t offset = 7; 361160ce86c7SWei Liu V9fsFidState *fidp; 361260ce86c7SWei Liu struct statfs stbuf; 361360ce86c7SWei Liu V9fsPDU *pdu = opaque; 361460ce86c7SWei Liu V9fsState *s = pdu->s; 361560ce86c7SWei Liu 361660ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 361760ce86c7SWei Liu if (retval < 0) { 361860ce86c7SWei Liu goto out_nofid; 361960ce86c7SWei Liu } 362060ce86c7SWei Liu fidp = get_fid(pdu, fid); 362160ce86c7SWei Liu if (fidp == NULL) { 362260ce86c7SWei Liu retval = -ENOENT; 362360ce86c7SWei Liu goto out_nofid; 362460ce86c7SWei Liu } 362560ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 362660ce86c7SWei Liu if (retval < 0) { 362760ce86c7SWei Liu goto out; 362860ce86c7SWei Liu } 362960ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 363060ce86c7SWei Liu if (retval < 0) { 363160ce86c7SWei Liu goto out; 363260ce86c7SWei Liu } 363360ce86c7SWei Liu retval += offset; 363460ce86c7SWei Liu out: 363560ce86c7SWei Liu put_fid(pdu, fidp); 363660ce86c7SWei Liu out_nofid: 363760ce86c7SWei Liu pdu_complete(pdu, retval); 363860ce86c7SWei Liu } 363960ce86c7SWei Liu 36408440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 364160ce86c7SWei Liu { 364260ce86c7SWei Liu 364360ce86c7SWei Liu int mode; 364460ce86c7SWei Liu gid_t gid; 364560ce86c7SWei Liu int32_t fid; 364660ce86c7SWei Liu V9fsQID qid; 364760ce86c7SWei Liu int err = 0; 364860ce86c7SWei Liu int major, minor; 364960ce86c7SWei Liu size_t offset = 7; 365060ce86c7SWei Liu V9fsString name; 365160ce86c7SWei Liu struct stat stbuf; 365260ce86c7SWei Liu V9fsFidState *fidp; 365360ce86c7SWei Liu V9fsPDU *pdu = opaque; 365460ce86c7SWei Liu 365560ce86c7SWei Liu v9fs_string_init(&name); 365660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 365760ce86c7SWei Liu &major, &minor, &gid); 365860ce86c7SWei Liu if (err < 0) { 365960ce86c7SWei Liu goto out_nofid; 366060ce86c7SWei Liu } 366160ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 366260ce86c7SWei Liu 3663fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3664fff39a7aSGreg Kurz err = -ENOENT; 3665fff39a7aSGreg Kurz goto out_nofid; 3666fff39a7aSGreg Kurz } 3667fff39a7aSGreg Kurz 3668805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3669805b5d98SGreg Kurz err = -EEXIST; 3670805b5d98SGreg Kurz goto out_nofid; 3671805b5d98SGreg Kurz } 3672805b5d98SGreg Kurz 367360ce86c7SWei Liu fidp = get_fid(pdu, fid); 367460ce86c7SWei Liu if (fidp == NULL) { 367560ce86c7SWei Liu err = -ENOENT; 367660ce86c7SWei Liu goto out_nofid; 367760ce86c7SWei Liu } 367860ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 367960ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 368060ce86c7SWei Liu if (err < 0) { 368160ce86c7SWei Liu goto out; 368260ce86c7SWei Liu } 36833b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36843b5ee9e8SAntonios Motakis if (err < 0) { 36853b5ee9e8SAntonios Motakis goto out; 36863b5ee9e8SAntonios Motakis } 368760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 368860ce86c7SWei Liu if (err < 0) { 368960ce86c7SWei Liu goto out; 369060ce86c7SWei Liu } 369160ce86c7SWei Liu err += offset; 369260ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 369360ce86c7SWei Liu qid.type, qid.version, qid.path); 369460ce86c7SWei Liu out: 369560ce86c7SWei Liu put_fid(pdu, fidp); 369660ce86c7SWei Liu out_nofid: 369760ce86c7SWei Liu pdu_complete(pdu, err); 369860ce86c7SWei Liu v9fs_string_free(&name); 369960ce86c7SWei Liu } 370060ce86c7SWei Liu 370160ce86c7SWei Liu /* 370260ce86c7SWei Liu * Implement posix byte range locking code 370360ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 370460ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 370560ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 370660ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 370760ce86c7SWei Liu * So when a TLOCK request comes, always return success 370860ce86c7SWei Liu */ 37098440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 371060ce86c7SWei Liu { 371160ce86c7SWei Liu V9fsFlock flock; 371260ce86c7SWei Liu size_t offset = 7; 371360ce86c7SWei Liu struct stat stbuf; 371460ce86c7SWei Liu V9fsFidState *fidp; 371560ce86c7SWei Liu int32_t fid, err = 0; 371660ce86c7SWei Liu V9fsPDU *pdu = opaque; 371760ce86c7SWei Liu 371860ce86c7SWei Liu v9fs_string_init(&flock.client_id); 371960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 372060ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 372160ce86c7SWei Liu &flock.proc_id, &flock.client_id); 372260ce86c7SWei Liu if (err < 0) { 372360ce86c7SWei Liu goto out_nofid; 372460ce86c7SWei Liu } 372560ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 372660ce86c7SWei Liu flock.type, flock.start, flock.length); 372760ce86c7SWei Liu 372860ce86c7SWei Liu 372960ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 373060ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 373160ce86c7SWei Liu err = -EINVAL; 373260ce86c7SWei Liu goto out_nofid; 373360ce86c7SWei Liu } 373460ce86c7SWei Liu fidp = get_fid(pdu, fid); 373560ce86c7SWei Liu if (fidp == NULL) { 373660ce86c7SWei Liu err = -ENOENT; 373760ce86c7SWei Liu goto out_nofid; 373860ce86c7SWei Liu } 373960ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 374060ce86c7SWei Liu if (err < 0) { 374160ce86c7SWei Liu goto out; 374260ce86c7SWei Liu } 37434bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 37444bae2b39SPaolo Bonzini if (err < 0) { 37454bae2b39SPaolo Bonzini goto out; 37464bae2b39SPaolo Bonzini } 37474bae2b39SPaolo Bonzini err += offset; 37484bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 374960ce86c7SWei Liu out: 375060ce86c7SWei Liu put_fid(pdu, fidp); 375160ce86c7SWei Liu out_nofid: 375260ce86c7SWei Liu pdu_complete(pdu, err); 375360ce86c7SWei Liu v9fs_string_free(&flock.client_id); 375460ce86c7SWei Liu } 375560ce86c7SWei Liu 375660ce86c7SWei Liu /* 375760ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 375860ce86c7SWei Liu * handling is done by client's VFS layer. 375960ce86c7SWei Liu */ 37608440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 376160ce86c7SWei Liu { 376260ce86c7SWei Liu size_t offset = 7; 376360ce86c7SWei Liu struct stat stbuf; 376460ce86c7SWei Liu V9fsFidState *fidp; 376560ce86c7SWei Liu V9fsGetlock glock; 376660ce86c7SWei Liu int32_t fid, err = 0; 376760ce86c7SWei Liu V9fsPDU *pdu = opaque; 376860ce86c7SWei Liu 376960ce86c7SWei Liu v9fs_string_init(&glock.client_id); 377060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 377160ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 377260ce86c7SWei Liu &glock.client_id); 377360ce86c7SWei Liu if (err < 0) { 377460ce86c7SWei Liu goto out_nofid; 377560ce86c7SWei Liu } 377660ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 377760ce86c7SWei Liu glock.type, glock.start, glock.length); 377860ce86c7SWei Liu 377960ce86c7SWei Liu fidp = get_fid(pdu, fid); 378060ce86c7SWei Liu if (fidp == NULL) { 378160ce86c7SWei Liu err = -ENOENT; 378260ce86c7SWei Liu goto out_nofid; 378360ce86c7SWei Liu } 378460ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 378560ce86c7SWei Liu if (err < 0) { 378660ce86c7SWei Liu goto out; 378760ce86c7SWei Liu } 378860ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 378960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 379060ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 379160ce86c7SWei Liu &glock.client_id); 379260ce86c7SWei Liu if (err < 0) { 379360ce86c7SWei Liu goto out; 379460ce86c7SWei Liu } 379560ce86c7SWei Liu err += offset; 379660ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 379760ce86c7SWei Liu glock.length, glock.proc_id); 379860ce86c7SWei Liu out: 379960ce86c7SWei Liu put_fid(pdu, fidp); 380060ce86c7SWei Liu out_nofid: 380160ce86c7SWei Liu pdu_complete(pdu, err); 380260ce86c7SWei Liu v9fs_string_free(&glock.client_id); 380360ce86c7SWei Liu } 380460ce86c7SWei Liu 38058440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 380660ce86c7SWei Liu { 380760ce86c7SWei Liu V9fsPDU *pdu = opaque; 380860ce86c7SWei Liu size_t offset = 7; 380960ce86c7SWei Liu int32_t fid; 381060ce86c7SWei Liu struct stat stbuf; 381160ce86c7SWei Liu V9fsQID qid; 381260ce86c7SWei Liu V9fsString name; 381360ce86c7SWei Liu V9fsFidState *fidp; 381460ce86c7SWei Liu gid_t gid; 381560ce86c7SWei Liu int mode; 381660ce86c7SWei Liu int err = 0; 381760ce86c7SWei Liu 381860ce86c7SWei Liu v9fs_string_init(&name); 381960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 382060ce86c7SWei Liu if (err < 0) { 382160ce86c7SWei Liu goto out_nofid; 382260ce86c7SWei Liu } 382360ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 382460ce86c7SWei Liu 3825fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3826fff39a7aSGreg Kurz err = -ENOENT; 3827fff39a7aSGreg Kurz goto out_nofid; 3828fff39a7aSGreg Kurz } 3829fff39a7aSGreg Kurz 3830805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3831805b5d98SGreg Kurz err = -EEXIST; 3832805b5d98SGreg Kurz goto out_nofid; 3833805b5d98SGreg Kurz } 3834805b5d98SGreg Kurz 383560ce86c7SWei Liu fidp = get_fid(pdu, fid); 383660ce86c7SWei Liu if (fidp == NULL) { 383760ce86c7SWei Liu err = -ENOENT; 383860ce86c7SWei Liu goto out_nofid; 383960ce86c7SWei Liu } 384060ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 384160ce86c7SWei Liu if (err < 0) { 384260ce86c7SWei Liu goto out; 384360ce86c7SWei Liu } 38443b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 38453b5ee9e8SAntonios Motakis if (err < 0) { 38463b5ee9e8SAntonios Motakis goto out; 38473b5ee9e8SAntonios Motakis } 384860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 384960ce86c7SWei Liu if (err < 0) { 385060ce86c7SWei Liu goto out; 385160ce86c7SWei Liu } 385260ce86c7SWei Liu err += offset; 385360ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 385460ce86c7SWei Liu qid.type, qid.version, qid.path, err); 385560ce86c7SWei Liu out: 385660ce86c7SWei Liu put_fid(pdu, fidp); 385760ce86c7SWei Liu out_nofid: 385860ce86c7SWei Liu pdu_complete(pdu, err); 385960ce86c7SWei Liu v9fs_string_free(&name); 386060ce86c7SWei Liu } 386160ce86c7SWei Liu 38628440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 386360ce86c7SWei Liu { 386460ce86c7SWei Liu int64_t size; 386560ce86c7SWei Liu V9fsString name; 386660ce86c7SWei Liu ssize_t err = 0; 386760ce86c7SWei Liu size_t offset = 7; 386860ce86c7SWei Liu int32_t fid, newfid; 386960ce86c7SWei Liu V9fsFidState *file_fidp; 387060ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 387160ce86c7SWei Liu V9fsPDU *pdu = opaque; 387260ce86c7SWei Liu V9fsState *s = pdu->s; 387360ce86c7SWei Liu 387460ce86c7SWei Liu v9fs_string_init(&name); 387560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 387660ce86c7SWei Liu if (err < 0) { 387760ce86c7SWei Liu goto out_nofid; 387860ce86c7SWei Liu } 387960ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 388060ce86c7SWei Liu 388160ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 388260ce86c7SWei Liu if (file_fidp == NULL) { 388360ce86c7SWei Liu err = -ENOENT; 388460ce86c7SWei Liu goto out_nofid; 388560ce86c7SWei Liu } 388660ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 388760ce86c7SWei Liu if (xattr_fidp == NULL) { 388860ce86c7SWei Liu err = -EINVAL; 388960ce86c7SWei Liu goto out; 389060ce86c7SWei Liu } 389160ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3892ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 389360ce86c7SWei Liu /* 389460ce86c7SWei Liu * listxattr request. Get the size first 389560ce86c7SWei Liu */ 389660ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 389760ce86c7SWei Liu if (size < 0) { 389860ce86c7SWei Liu err = size; 389960ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 390060ce86c7SWei Liu goto out; 390160ce86c7SWei Liu } 390260ce86c7SWei Liu /* 390360ce86c7SWei Liu * Read the xattr value 390460ce86c7SWei Liu */ 390560ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 390660ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3907dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 39087bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3909a647502cSKeno Fischer if (size) { 391060ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 391160ce86c7SWei Liu xattr_fidp->fs.xattr.value, 391260ce86c7SWei Liu xattr_fidp->fs.xattr.len); 391360ce86c7SWei Liu if (err < 0) { 391460ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 391560ce86c7SWei Liu goto out; 391660ce86c7SWei Liu } 391760ce86c7SWei Liu } 391860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 391960ce86c7SWei Liu if (err < 0) { 392060ce86c7SWei Liu goto out; 392160ce86c7SWei Liu } 392260ce86c7SWei Liu err += offset; 392360ce86c7SWei Liu } else { 392460ce86c7SWei Liu /* 392560ce86c7SWei Liu * specific xattr fid. We check for xattr 392660ce86c7SWei Liu * presence also collect the xattr size 392760ce86c7SWei Liu */ 392860ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 392960ce86c7SWei Liu &name, NULL, 0); 393060ce86c7SWei Liu if (size < 0) { 393160ce86c7SWei Liu err = size; 393260ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 393360ce86c7SWei Liu goto out; 393460ce86c7SWei Liu } 393560ce86c7SWei Liu /* 393660ce86c7SWei Liu * Read the xattr value 393760ce86c7SWei Liu */ 393860ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 393960ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3940dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 39417bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3942a647502cSKeno Fischer if (size) { 394360ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 394460ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 394560ce86c7SWei Liu xattr_fidp->fs.xattr.len); 394660ce86c7SWei Liu if (err < 0) { 394760ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 394860ce86c7SWei Liu goto out; 394960ce86c7SWei Liu } 395060ce86c7SWei Liu } 395160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 395260ce86c7SWei Liu if (err < 0) { 395360ce86c7SWei Liu goto out; 395460ce86c7SWei Liu } 395560ce86c7SWei Liu err += offset; 395660ce86c7SWei Liu } 395760ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 395860ce86c7SWei Liu out: 395960ce86c7SWei Liu put_fid(pdu, file_fidp); 396060ce86c7SWei Liu if (xattr_fidp) { 396160ce86c7SWei Liu put_fid(pdu, xattr_fidp); 396260ce86c7SWei Liu } 396360ce86c7SWei Liu out_nofid: 396460ce86c7SWei Liu pdu_complete(pdu, err); 396560ce86c7SWei Liu v9fs_string_free(&name); 396660ce86c7SWei Liu } 396760ce86c7SWei Liu 3968a136d175SWill Cohen #if defined(CONFIG_LINUX) 3969a136d175SWill Cohen /* Currently, only Linux has XATTR_SIZE_MAX */ 3970a136d175SWill Cohen #define P9_XATTR_SIZE_MAX XATTR_SIZE_MAX 3971a136d175SWill Cohen #elif defined(CONFIG_DARWIN) 3972a136d175SWill Cohen /* 3973a136d175SWill Cohen * Darwin doesn't seem to define a maximum xattr size in its user 3974a136d175SWill Cohen * space header, so manually configure it across platforms as 64k. 3975a136d175SWill Cohen * 3976a136d175SWill Cohen * Having no limit at all can lead to QEMU crashing during large g_malloc() 3977a136d175SWill Cohen * calls. Because QEMU does not currently support macOS guests, the below 3978a136d175SWill Cohen * preliminary solution only works due to its being a reflection of the limit of 3979a136d175SWill Cohen * Linux guests. 3980a136d175SWill Cohen */ 3981a136d175SWill Cohen #define P9_XATTR_SIZE_MAX 65536 3982a136d175SWill Cohen #else 3983a136d175SWill Cohen #error Missing definition for P9_XATTR_SIZE_MAX for this host system 3984a136d175SWill Cohen #endif 3985a136d175SWill Cohen 39868440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 398760ce86c7SWei Liu { 3988aca6897fSKeno Fischer int flags, rflags = 0; 398960ce86c7SWei Liu int32_t fid; 39903b79ef2cSGreg Kurz uint64_t size; 399160ce86c7SWei Liu ssize_t err = 0; 399260ce86c7SWei Liu V9fsString name; 399360ce86c7SWei Liu size_t offset = 7; 399460ce86c7SWei Liu V9fsFidState *file_fidp; 399560ce86c7SWei Liu V9fsFidState *xattr_fidp; 399660ce86c7SWei Liu V9fsPDU *pdu = opaque; 399760ce86c7SWei Liu 399860ce86c7SWei Liu v9fs_string_init(&name); 399960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 400060ce86c7SWei Liu if (err < 0) { 400160ce86c7SWei Liu goto out_nofid; 400260ce86c7SWei Liu } 400360ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 400460ce86c7SWei Liu 4005aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 4006aca6897fSKeno Fischer err = -EINVAL; 4007aca6897fSKeno Fischer goto out_nofid; 4008aca6897fSKeno Fischer } 4009aca6897fSKeno Fischer 4010aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 4011aca6897fSKeno Fischer rflags |= XATTR_CREATE; 4012aca6897fSKeno Fischer } 4013aca6897fSKeno Fischer 4014aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 4015aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 4016aca6897fSKeno Fischer } 4017aca6897fSKeno Fischer 401838d7fd68SKeno Fischer if (size > P9_XATTR_SIZE_MAX) { 40193b79ef2cSGreg Kurz err = -E2BIG; 40203b79ef2cSGreg Kurz goto out_nofid; 40213b79ef2cSGreg Kurz } 40223b79ef2cSGreg Kurz 402360ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 402460ce86c7SWei Liu if (file_fidp == NULL) { 402560ce86c7SWei Liu err = -EINVAL; 402660ce86c7SWei Liu goto out_nofid; 402760ce86c7SWei Liu } 4028dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 4029dd654e03SGreg Kurz err = -EINVAL; 4030dd654e03SGreg Kurz goto out_put_fid; 4031dd654e03SGreg Kurz } 4032dd654e03SGreg Kurz 403360ce86c7SWei Liu /* Make the file fid point to xattr */ 403460ce86c7SWei Liu xattr_fidp = file_fidp; 403560ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 403660ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 4037dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 403860ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 4039aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 404060ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 404160ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 4042eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 404360ce86c7SWei Liu err = offset; 4044dd654e03SGreg Kurz out_put_fid: 404560ce86c7SWei Liu put_fid(pdu, file_fidp); 404660ce86c7SWei Liu out_nofid: 404760ce86c7SWei Liu pdu_complete(pdu, err); 404860ce86c7SWei Liu v9fs_string_free(&name); 404960ce86c7SWei Liu } 405060ce86c7SWei Liu 40518440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 405260ce86c7SWei Liu { 405360ce86c7SWei Liu V9fsPDU *pdu = opaque; 405460ce86c7SWei Liu size_t offset = 7; 405560ce86c7SWei Liu V9fsString target; 405660ce86c7SWei Liu int32_t fid; 405760ce86c7SWei Liu int err = 0; 405860ce86c7SWei Liu V9fsFidState *fidp; 405960ce86c7SWei Liu 406060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 406160ce86c7SWei Liu if (err < 0) { 406260ce86c7SWei Liu goto out_nofid; 406360ce86c7SWei Liu } 406460ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 406560ce86c7SWei Liu fidp = get_fid(pdu, fid); 406660ce86c7SWei Liu if (fidp == NULL) { 406760ce86c7SWei Liu err = -ENOENT; 406860ce86c7SWei Liu goto out_nofid; 406960ce86c7SWei Liu } 407060ce86c7SWei Liu 407160ce86c7SWei Liu v9fs_string_init(&target); 407260ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 407360ce86c7SWei Liu if (err < 0) { 407460ce86c7SWei Liu goto out; 407560ce86c7SWei Liu } 407660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 407760ce86c7SWei Liu if (err < 0) { 407860ce86c7SWei Liu v9fs_string_free(&target); 407960ce86c7SWei Liu goto out; 408060ce86c7SWei Liu } 408160ce86c7SWei Liu err += offset; 408260ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 408360ce86c7SWei Liu v9fs_string_free(&target); 408460ce86c7SWei Liu out: 408560ce86c7SWei Liu put_fid(pdu, fidp); 408660ce86c7SWei Liu out_nofid: 408760ce86c7SWei Liu pdu_complete(pdu, err); 408860ce86c7SWei Liu } 408960ce86c7SWei Liu 409060ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 409160ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 409260ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 409360ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 409460ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 409560ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 409660ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 409760ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 409860ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 409960ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 410060ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 410160ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 410260ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 410360ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 410460ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 410560ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 410660ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 410760ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 410860ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 410960ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 411060ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 411160ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 411260ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 411360ce86c7SWei Liu [P9_TREAD] = v9fs_read, 411460ce86c7SWei Liu #if 0 411560ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 411660ce86c7SWei Liu #endif 411760ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 411860ce86c7SWei Liu [P9_TLINK] = v9fs_link, 411960ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 412060ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 412160ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 412260ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 412360ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 412460ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 412560ce86c7SWei Liu }; 412660ce86c7SWei Liu 41278440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 412860ce86c7SWei Liu { 412960ce86c7SWei Liu V9fsPDU *pdu = opaque; 413060ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 413160ce86c7SWei Liu } 413260ce86c7SWei Liu 41338440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 413460ce86c7SWei Liu { 413560ce86c7SWei Liu V9fsPDU *pdu = opaque; 413660ce86c7SWei Liu pdu_complete(pdu, -EROFS); 413760ce86c7SWei Liu } 413860ce86c7SWei Liu 413960ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 414060ce86c7SWei Liu { 414160ce86c7SWei Liu switch (pdu->id) { 414260ce86c7SWei Liu case P9_TREADDIR: 414360ce86c7SWei Liu case P9_TSTATFS: 414460ce86c7SWei Liu case P9_TGETATTR: 414560ce86c7SWei Liu case P9_TXATTRWALK: 414660ce86c7SWei Liu case P9_TLOCK: 414760ce86c7SWei Liu case P9_TGETLOCK: 414860ce86c7SWei Liu case P9_TREADLINK: 414960ce86c7SWei Liu case P9_TVERSION: 415060ce86c7SWei Liu case P9_TLOPEN: 415160ce86c7SWei Liu case P9_TATTACH: 415260ce86c7SWei Liu case P9_TSTAT: 415360ce86c7SWei Liu case P9_TWALK: 415460ce86c7SWei Liu case P9_TCLUNK: 415560ce86c7SWei Liu case P9_TFSYNC: 415660ce86c7SWei Liu case P9_TOPEN: 415760ce86c7SWei Liu case P9_TREAD: 415860ce86c7SWei Liu case P9_TAUTH: 415960ce86c7SWei Liu case P9_TFLUSH: 416060ce86c7SWei Liu return 1; 416160ce86c7SWei Liu default: 416260ce86c7SWei Liu return 0; 416360ce86c7SWei Liu } 416460ce86c7SWei Liu } 416560ce86c7SWei Liu 4166506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 416760ce86c7SWei Liu { 416860ce86c7SWei Liu Coroutine *co; 416960ce86c7SWei Liu CoroutineEntry *handler; 417060ce86c7SWei Liu V9fsState *s = pdu->s; 417160ce86c7SWei Liu 4172506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4173506f3275SGreg Kurz pdu->id = hdr->id; 4174506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4175506f3275SGreg Kurz 417660ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 417760ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 417860ce86c7SWei Liu handler = v9fs_op_not_supp; 4179d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4180d1471233SGreg Kurz handler = v9fs_fs_ro; 418160ce86c7SWei Liu } else { 418260ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 418360ce86c7SWei Liu } 418460ce86c7SWei Liu 4185506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 41860b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 41870b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 418860ce86c7SWei Liu } 418960ce86c7SWei Liu 41902a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4191066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4192066eb006SGreg Kurz Error **errp) 41932a0c56aaSWei Liu { 419492c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 41952a0c56aaSWei Liu int i, len; 41962a0c56aaSWei Liu struct stat stat; 41972a0c56aaSWei Liu FsDriverEntry *fse; 41982a0c56aaSWei Liu V9fsPath path; 41992a0c56aaSWei Liu int rc = 1; 42002a0c56aaSWei Liu 4201066eb006SGreg Kurz assert(!s->transport); 4202066eb006SGreg Kurz s->transport = t; 4203066eb006SGreg Kurz 42042a0c56aaSWei Liu /* initialize pdu allocator */ 42052a0c56aaSWei Liu QLIST_INIT(&s->free_list); 42062a0c56aaSWei Liu QLIST_INIT(&s->active_list); 42070d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4208583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4209583f21f8SStefano Stabellini s->pdus[i].s = s; 4210583f21f8SStefano Stabellini s->pdus[i].idx = i; 42112a0c56aaSWei Liu } 42122a0c56aaSWei Liu 42132a0c56aaSWei Liu v9fs_path_init(&path); 42142a0c56aaSWei Liu 42152a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 42162a0c56aaSWei Liu 42172a0c56aaSWei Liu if (!fse) { 42182a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 42192a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 42202a0c56aaSWei Liu "id = %s", 42212a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 42222a0c56aaSWei Liu goto out; 42232a0c56aaSWei Liu } 42242a0c56aaSWei Liu 42252a0c56aaSWei Liu if (!s->fsconf.tag) { 42262a0c56aaSWei Liu /* we haven't specified a mount_tag */ 42272a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 42282a0c56aaSWei Liu s->fsconf.fsdev_id); 42292a0c56aaSWei Liu goto out; 42302a0c56aaSWei Liu } 42312a0c56aaSWei Liu 42322a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 42332a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 42342a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 42352a0c56aaSWei Liu len = strlen(s->fsconf.tag); 42362a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 42372a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 42382a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 42392a0c56aaSWei Liu goto out; 42402a0c56aaSWei Liu } 42412a0c56aaSWei Liu 42422a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 42432a0c56aaSWei Liu s->ctx.uid = -1; 42442a0c56aaSWei Liu 42452a0c56aaSWei Liu s->ops = fse->ops; 42462a0c56aaSWei Liu 4247b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4248b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4249b96feb2cSTobias Schramm 4250f5265c8fSLinus Heckemann s->fids = g_hash_table_new(NULL, NULL); 42512a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 42522a0c56aaSWei Liu 425365603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 425465603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 425565603a80SGreg Kurz s->fsconf.fsdev_id); 42562a0c56aaSWei Liu goto out; 42572a0c56aaSWei Liu } 42582a0c56aaSWei Liu 42592a0c56aaSWei Liu /* 42602a0c56aaSWei Liu * Check details of export path, We need to use fs driver 42612a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 42622a0c56aaSWei Liu * use co-routines here. 42632a0c56aaSWei Liu */ 42642a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 42652a0c56aaSWei Liu error_setg(errp, 42662a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 42672a0c56aaSWei Liu goto out; 42682a0c56aaSWei Liu } 42692a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 42702a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 42712a0c56aaSWei Liu goto out; 42722a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 42732a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 42742a0c56aaSWei Liu goto out; 42752a0c56aaSWei Liu } 4276b8bbdb88SPradeep Jagadeesh 42773b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 42783b5ee9e8SAntonios Motakis 42796b6aa828SChristian Schoenebeck /* init inode remapping : */ 42806b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 42816b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 42826b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 42836b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 42846b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 42851a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 42866b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 42876b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4288f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 42891a6ed33cSAntonios Motakis 4290b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4291b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4292b8bbdb88SPradeep Jagadeesh 42932a0c56aaSWei Liu rc = 0; 42942a0c56aaSWei Liu out: 42952a0c56aaSWei Liu if (rc) { 4296b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4297702dbcc2SLi Qiang } 42982a0c56aaSWei Liu v9fs_path_free(&path); 42992a0c56aaSWei Liu return rc; 43002a0c56aaSWei Liu } 43012a0c56aaSWei Liu 4302b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 43032a0c56aaSWei Liu { 4304c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4305702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4306702dbcc2SLi Qiang } 4307c0da0cb7SGreg Kurz if (s->ctx.fst) { 4308b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4309c0da0cb7SGreg Kurz } 4310f5265c8fSLinus Heckemann if (s->fids) { 4311f5265c8fSLinus Heckemann g_hash_table_destroy(s->fids); 4312f5265c8fSLinus Heckemann s->fids = NULL; 4313f5265c8fSLinus Heckemann } 43142a0c56aaSWei Liu g_free(s->tag); 43156b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4316f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4317f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 43184774718eSLi Qiang g_free(s->ctx.fs_root); 43192a0c56aaSWei Liu } 43202a0c56aaSWei Liu 43210e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 43220e44a0fdSGreg Kurz V9fsPDU pdu; 43230e44a0fdSGreg Kurz bool done; 43240e44a0fdSGreg Kurz } VirtfsCoResetData; 43250e44a0fdSGreg Kurz 43260e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 43270e44a0fdSGreg Kurz { 43280e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 43290e44a0fdSGreg Kurz 43300e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 43310e44a0fdSGreg Kurz data->done = true; 43320e44a0fdSGreg Kurz } 43330e44a0fdSGreg Kurz 43340e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 43350e44a0fdSGreg Kurz { 43360e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 43370e44a0fdSGreg Kurz Coroutine *co; 43380e44a0fdSGreg Kurz 43390e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 43400e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 43410e44a0fdSGreg Kurz } 43420e44a0fdSGreg Kurz 43430e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 43440e44a0fdSGreg Kurz qemu_coroutine_enter(co); 43450e44a0fdSGreg Kurz 43460e44a0fdSGreg Kurz while (!data.done) { 43470e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 43480e44a0fdSGreg Kurz } 43490e44a0fdSGreg Kurz } 43500e44a0fdSGreg Kurz 435160ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 435260ce86c7SWei Liu { 435360ce86c7SWei Liu struct rlimit rlim; 435460ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 435563325b18SGreg Kurz error_report("Failed to get the resource limit"); 435660ce86c7SWei Liu exit(1); 435760ce86c7SWei Liu } 435860ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 435960ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 436060ce86c7SWei Liu } 4361