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" 20e3e83f2eSGreg Kurz #include <glib/gprintf.h> 2160ce86c7SWei Liu #include "hw/virtio/virtio.h" 22da34e65cSMarkus Armbruster #include "qapi/error.h" 2360ce86c7SWei Liu #include "qemu/error-report.h" 2460ce86c7SWei Liu #include "qemu/iov.h" 25db725815SMarkus Armbruster #include "qemu/main-loop.h" 2660ce86c7SWei Liu #include "qemu/sockets.h" 2760ce86c7SWei Liu #include "virtio-9p.h" 2860ce86c7SWei Liu #include "fsdev/qemu-fsdev.h" 2960ce86c7SWei Liu #include "9p-xattr.h" 306b3b279bSKeno Fischer #include "9p-util.h" 3160ce86c7SWei Liu #include "coth.h" 3260ce86c7SWei Liu #include "trace.h" 33795c40b8SJuan Quintela #include "migration/blocker.h" 341a6ed33cSAntonios Motakis #include "qemu/xxhash.h" 356b6aa828SChristian Schoenebeck #include <math.h> 36e0bd743bSKeno Fischer #ifdef CONFIG_LINUX 3703556ea9SDan Robertson #include <linux/limits.h> 38e0bd743bSKeno Fischer #else 39e0bd743bSKeno Fischer #include <limits.h> 40e0bd743bSKeno Fischer #endif 4160ce86c7SWei Liu 4260ce86c7SWei Liu int open_fd_hw; 4360ce86c7SWei Liu int total_open_fd; 4460ce86c7SWei Liu static int open_fd_rc; 4560ce86c7SWei Liu 4660ce86c7SWei Liu enum { 4760ce86c7SWei Liu Oread = 0x00, 4860ce86c7SWei Liu Owrite = 0x01, 4960ce86c7SWei Liu Ordwr = 0x02, 5060ce86c7SWei Liu Oexec = 0x03, 5160ce86c7SWei Liu Oexcl = 0x04, 5260ce86c7SWei Liu Otrunc = 0x10, 5360ce86c7SWei Liu Orexec = 0x20, 5460ce86c7SWei Liu Orclose = 0x40, 5560ce86c7SWei Liu Oappend = 0x80, 5660ce86c7SWei Liu }; 5760ce86c7SWei Liu 58cc82fde9SChristian Schoenebeck P9ARRAY_DEFINE_TYPE(V9fsPath, v9fs_path_free); 59cc82fde9SChristian Schoenebeck 6075673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 6160ce86c7SWei Liu { 6260ce86c7SWei Liu ssize_t ret; 6360ce86c7SWei Liu va_list ap; 6460ce86c7SWei Liu 6560ce86c7SWei Liu va_start(ap, fmt); 66ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 6760ce86c7SWei Liu va_end(ap); 6860ce86c7SWei Liu 6960ce86c7SWei Liu return ret; 7060ce86c7SWei Liu } 7160ce86c7SWei Liu 7275673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 7360ce86c7SWei Liu { 7460ce86c7SWei Liu ssize_t ret; 7560ce86c7SWei Liu va_list ap; 7660ce86c7SWei Liu 7760ce86c7SWei Liu va_start(ap, fmt); 78ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 7960ce86c7SWei Liu va_end(ap); 8060ce86c7SWei Liu 8160ce86c7SWei Liu return ret; 8260ce86c7SWei Liu } 8360ce86c7SWei Liu 8460ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 8560ce86c7SWei Liu { 8660ce86c7SWei Liu int ret = 0; 8760ce86c7SWei Liu 8860ce86c7SWei Liu switch (mode & 3) { 8960ce86c7SWei Liu case Oread: 9060ce86c7SWei Liu ret = O_RDONLY; 9160ce86c7SWei Liu break; 9260ce86c7SWei Liu case Ordwr: 9360ce86c7SWei Liu ret = O_RDWR; 9460ce86c7SWei Liu break; 9560ce86c7SWei Liu case Owrite: 9660ce86c7SWei Liu ret = O_WRONLY; 9760ce86c7SWei Liu break; 9860ce86c7SWei Liu case Oexec: 9960ce86c7SWei Liu ret = O_RDONLY; 10060ce86c7SWei Liu break; 10160ce86c7SWei Liu } 10260ce86c7SWei Liu 10360ce86c7SWei Liu if (mode & Otrunc) { 10460ce86c7SWei Liu ret |= O_TRUNC; 10560ce86c7SWei Liu } 10660ce86c7SWei Liu 10760ce86c7SWei Liu if (mode & Oappend) { 10860ce86c7SWei Liu ret |= O_APPEND; 10960ce86c7SWei Liu } 11060ce86c7SWei Liu 11160ce86c7SWei Liu if (mode & Oexcl) { 11260ce86c7SWei Liu ret |= O_EXCL; 11360ce86c7SWei Liu } 11460ce86c7SWei Liu 11560ce86c7SWei Liu return ret; 11660ce86c7SWei Liu } 11760ce86c7SWei Liu 1188e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 11960ce86c7SWei Liu int dotl_flag; 12060ce86c7SWei Liu int open_flag; 1218e71b96cSGreg Kurz } DotlOpenflagMap; 12260ce86c7SWei Liu 12360ce86c7SWei Liu static int dotl_to_open_flags(int flags) 12460ce86c7SWei Liu { 12560ce86c7SWei Liu int i; 12660ce86c7SWei Liu /* 12760ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 12860ce86c7SWei Liu * and P9_DOTL_NOACCESS 12960ce86c7SWei Liu */ 13060ce86c7SWei Liu int oflags = flags & O_ACCMODE; 13160ce86c7SWei Liu 1328e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 13360ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 13460ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 13560ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 13660ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 13760ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 13860ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 13960ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 14060ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 14167a71e3bSKeno Fischer #ifndef CONFIG_DARWIN 14267a71e3bSKeno Fischer { P9_DOTL_NOATIME, O_NOATIME }, 14367a71e3bSKeno Fischer /* 14467a71e3bSKeno Fischer * On Darwin, we could map to F_NOCACHE, which is 14567a71e3bSKeno Fischer * similar, but doesn't quite have the same 14667a71e3bSKeno Fischer * semantics. However, we don't support O_DIRECT 14767a71e3bSKeno Fischer * even on linux at the moment, so we just ignore 14867a71e3bSKeno Fischer * it here. 14967a71e3bSKeno Fischer */ 15060ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 15167a71e3bSKeno Fischer #endif 15260ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 15360ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 15460ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 15560ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 15660ce86c7SWei Liu }; 15760ce86c7SWei Liu 15860ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 15960ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 16060ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 16160ce86c7SWei Liu } 16260ce86c7SWei Liu } 16360ce86c7SWei Liu 16460ce86c7SWei Liu return oflags; 16560ce86c7SWei Liu } 16660ce86c7SWei Liu 16760ce86c7SWei Liu void cred_init(FsCred *credp) 16860ce86c7SWei Liu { 16960ce86c7SWei Liu credp->fc_uid = -1; 17060ce86c7SWei Liu credp->fc_gid = -1; 17160ce86c7SWei Liu credp->fc_mode = -1; 17260ce86c7SWei Liu credp->fc_rdev = -1; 17360ce86c7SWei Liu } 17460ce86c7SWei Liu 17560ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 17660ce86c7SWei Liu { 17760ce86c7SWei Liu int flags; 17860ce86c7SWei Liu /* 17960ce86c7SWei Liu * Filter the client open flags 18060ce86c7SWei Liu */ 18160ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 18260ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 18367a71e3bSKeno Fischer #ifndef CONFIG_DARWIN 18460ce86c7SWei Liu /* 18560ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 18660ce86c7SWei Liu */ 18760ce86c7SWei Liu flags &= ~O_DIRECT; 18867a71e3bSKeno Fischer #endif 18960ce86c7SWei Liu return flags; 19060ce86c7SWei Liu } 19160ce86c7SWei Liu 19260ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 19360ce86c7SWei Liu { 19460ce86c7SWei Liu path->data = NULL; 19560ce86c7SWei Liu path->size = 0; 19660ce86c7SWei Liu } 19760ce86c7SWei Liu 19860ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 19960ce86c7SWei Liu { 20060ce86c7SWei Liu g_free(path->data); 20160ce86c7SWei Liu path->data = NULL; 20260ce86c7SWei Liu path->size = 0; 20360ce86c7SWei Liu } 20460ce86c7SWei Liu 205e3e83f2eSGreg Kurz 206e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 207e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 208e3e83f2eSGreg Kurz { 209e3e83f2eSGreg Kurz va_list ap; 210e3e83f2eSGreg Kurz 211e3e83f2eSGreg Kurz v9fs_path_free(path); 212e3e83f2eSGreg Kurz 213e3e83f2eSGreg Kurz va_start(ap, fmt); 214e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 215e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 216e3e83f2eSGreg Kurz va_end(ap); 217e3e83f2eSGreg Kurz } 218e3e83f2eSGreg Kurz 219e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 22060ce86c7SWei Liu { 221e446a1ebSMarc-André Lureau v9fs_path_free(dst); 222e446a1ebSMarc-André Lureau dst->size = src->size; 223e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 22460ce86c7SWei Liu } 22560ce86c7SWei Liu 22660ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 22760ce86c7SWei Liu const char *name, V9fsPath *path) 22860ce86c7SWei Liu { 22960ce86c7SWei Liu int err; 23060ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 23160ce86c7SWei Liu if (err < 0) { 23260ce86c7SWei Liu err = -errno; 23360ce86c7SWei Liu } 23460ce86c7SWei Liu return err; 23560ce86c7SWei Liu } 23660ce86c7SWei Liu 23760ce86c7SWei Liu /* 23860ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 23960ce86c7SWei Liu * 24060ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 24160ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 24260ce86c7SWei Liu */ 24360ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 24460ce86c7SWei Liu { 24560ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 24660ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 24760ce86c7SWei Liu return 1; 24860ce86c7SWei Liu } 24960ce86c7SWei Liu } 25060ce86c7SWei Liu return 0; 25160ce86c7SWei Liu } 25260ce86c7SWei Liu 25360ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 25460ce86c7SWei Liu { 25560ce86c7SWei Liu return str->size; 25660ce86c7SWei Liu } 25760ce86c7SWei Liu 25860ce86c7SWei Liu /* 25960ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2608440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 26160ce86c7SWei Liu { 26260ce86c7SWei Liu int err = 1; 26360ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 26460ce86c7SWei Liu if (f->fs.fd == -1) { 26560ce86c7SWei Liu do { 26660ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 26760ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 26860ce86c7SWei Liu } 26960ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 270f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 27160ce86c7SWei Liu do { 27260ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 27360ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 27460ce86c7SWei Liu } 27560ce86c7SWei Liu } 27660ce86c7SWei Liu return err; 27760ce86c7SWei Liu } 27860ce86c7SWei Liu 2798440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 28060ce86c7SWei Liu { 28160ce86c7SWei Liu int err; 28260ce86c7SWei Liu V9fsFidState *f; 28360ce86c7SWei Liu V9fsState *s = pdu->s; 28460ce86c7SWei Liu 285feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 28660ce86c7SWei Liu BUG_ON(f->clunked); 28760ce86c7SWei Liu if (f->fid == fid) { 28860ce86c7SWei Liu /* 28960ce86c7SWei Liu * Update the fid ref upfront so that 29060ce86c7SWei Liu * we don't get reclaimed when we yield 29160ce86c7SWei Liu * in open later. 29260ce86c7SWei Liu */ 29360ce86c7SWei Liu f->ref++; 29460ce86c7SWei Liu /* 29560ce86c7SWei Liu * check whether we need to reopen the 29660ce86c7SWei Liu * file. We might have closed the fd 29760ce86c7SWei Liu * while trying to free up some file 29860ce86c7SWei Liu * descriptors. 29960ce86c7SWei Liu */ 30060ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 30160ce86c7SWei Liu if (err < 0) { 30260ce86c7SWei Liu f->ref--; 30360ce86c7SWei Liu return NULL; 30460ce86c7SWei Liu } 30560ce86c7SWei Liu /* 30660ce86c7SWei Liu * Mark the fid as referenced so that the LRU 30760ce86c7SWei Liu * reclaim won't close the file descriptor 30860ce86c7SWei Liu */ 30960ce86c7SWei Liu f->flags |= FID_REFERENCED; 31060ce86c7SWei Liu return f; 31160ce86c7SWei Liu } 31260ce86c7SWei Liu } 31360ce86c7SWei Liu return NULL; 31460ce86c7SWei Liu } 31560ce86c7SWei Liu 31660ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 31760ce86c7SWei Liu { 31860ce86c7SWei Liu V9fsFidState *f; 31960ce86c7SWei Liu 320feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 32160ce86c7SWei Liu /* If fid is already there return NULL */ 32260ce86c7SWei Liu BUG_ON(f->clunked); 32360ce86c7SWei Liu if (f->fid == fid) { 32460ce86c7SWei Liu return NULL; 32560ce86c7SWei Liu } 32660ce86c7SWei Liu } 327*1366244aSMarkus Armbruster f = g_new0(V9fsFidState, 1); 32860ce86c7SWei Liu f->fid = fid; 32960ce86c7SWei Liu f->fid_type = P9_FID_NONE; 33060ce86c7SWei Liu f->ref = 1; 33160ce86c7SWei Liu /* 33260ce86c7SWei Liu * Mark the fid as referenced so that the LRU 33360ce86c7SWei Liu * reclaim won't close the file descriptor 33460ce86c7SWei Liu */ 33560ce86c7SWei Liu f->flags |= FID_REFERENCED; 33620b7f45bSGreg Kurz QSIMPLEQ_INSERT_TAIL(&s->fid_list, f, next); 33760ce86c7SWei Liu 338d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 339d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3407cde47d4SGreg Kurz 34160ce86c7SWei Liu return f; 34260ce86c7SWei Liu } 34360ce86c7SWei Liu 3448440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 34560ce86c7SWei Liu { 34660ce86c7SWei Liu int retval = 0; 34760ce86c7SWei Liu 348dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 34960ce86c7SWei Liu /* getxattr/listxattr fid */ 35060ce86c7SWei Liu goto free_value; 35160ce86c7SWei Liu } 35260ce86c7SWei Liu /* 35360ce86c7SWei Liu * if this is fid for setxattr. clunk should 35460ce86c7SWei Liu * result in setxattr localcall 35560ce86c7SWei Liu */ 35660ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 35760ce86c7SWei Liu /* clunk after partial write */ 35860ce86c7SWei Liu retval = -EINVAL; 35960ce86c7SWei Liu goto free_out; 36060ce86c7SWei Liu } 36160ce86c7SWei Liu if (fidp->fs.xattr.len) { 36260ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 36360ce86c7SWei Liu fidp->fs.xattr.value, 36460ce86c7SWei Liu fidp->fs.xattr.len, 36560ce86c7SWei Liu fidp->fs.xattr.flags); 36660ce86c7SWei Liu } else { 36760ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 36860ce86c7SWei Liu } 36960ce86c7SWei Liu free_out: 37060ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 37160ce86c7SWei Liu free_value: 37260ce86c7SWei Liu g_free(fidp->fs.xattr.value); 37360ce86c7SWei Liu return retval; 37460ce86c7SWei Liu } 37560ce86c7SWei Liu 3768440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 37760ce86c7SWei Liu { 37860ce86c7SWei Liu int retval = 0; 37960ce86c7SWei Liu 38060ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 38160ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 38260ce86c7SWei Liu if (fidp->fs.fd != -1) { 38360ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 38460ce86c7SWei Liu } 38560ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 386f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 38760ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 38860ce86c7SWei Liu } 38960ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 39060ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 39160ce86c7SWei Liu } 39260ce86c7SWei Liu v9fs_path_free(&fidp->path); 39360ce86c7SWei Liu g_free(fidp); 39460ce86c7SWei Liu return retval; 39560ce86c7SWei Liu } 39660ce86c7SWei Liu 3978440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 39860ce86c7SWei Liu { 39960ce86c7SWei Liu BUG_ON(!fidp->ref); 40060ce86c7SWei Liu fidp->ref--; 40160ce86c7SWei Liu /* 40260ce86c7SWei Liu * Don't free the fid if it is in reclaim list 40360ce86c7SWei Liu */ 40460ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 40560ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 40660ce86c7SWei Liu /* 40760ce86c7SWei Liu * if the clunked fid is root fid then we 40860ce86c7SWei Liu * have unmounted the fs on the client side. 40960ce86c7SWei Liu * delete the migration blocker. Ideally, this 41060ce86c7SWei Liu * should be hooked to transport close notification 41160ce86c7SWei Liu */ 41260ce86c7SWei Liu if (pdu->s->migration_blocker) { 41360ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 41460ce86c7SWei Liu error_free(pdu->s->migration_blocker); 41560ce86c7SWei Liu pdu->s->migration_blocker = NULL; 41660ce86c7SWei Liu } 41760ce86c7SWei Liu } 41860ce86c7SWei Liu return free_fid(pdu, fidp); 41960ce86c7SWei Liu } 42060ce86c7SWei Liu return 0; 42160ce86c7SWei Liu } 42260ce86c7SWei Liu 42360ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 42460ce86c7SWei Liu { 425feabd6cfSGreg Kurz V9fsFidState *fidp; 42660ce86c7SWei Liu 427feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 428feabd6cfSGreg Kurz if (fidp->fid == fid) { 429feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 4302e53160fSGreg Kurz fidp->clunked = true; 43160ce86c7SWei Liu return fidp; 43260ce86c7SWei Liu } 433feabd6cfSGreg Kurz } 434feabd6cfSGreg Kurz return NULL; 435feabd6cfSGreg Kurz } 43660ce86c7SWei Liu 4378440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 43860ce86c7SWei Liu { 43960ce86c7SWei Liu int reclaim_count = 0; 44060ce86c7SWei Liu V9fsState *s = pdu->s; 44181f9766bSGreg Kurz V9fsFidState *f; 44281f9766bSGreg Kurz QSLIST_HEAD(, V9fsFidState) reclaim_list = 44381f9766bSGreg Kurz QSLIST_HEAD_INITIALIZER(reclaim_list); 44460ce86c7SWei Liu 445feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 44660ce86c7SWei Liu /* 44760ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 44860ce86c7SWei Liu * for them and skip them. Also skip fids 44960ce86c7SWei Liu * currently being operated on. 45060ce86c7SWei Liu */ 45160ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 45260ce86c7SWei Liu continue; 45360ce86c7SWei Liu } 45460ce86c7SWei Liu /* 45560ce86c7SWei Liu * if it is a recently referenced fid 45660ce86c7SWei Liu * we leave the fid untouched and clear the 45760ce86c7SWei Liu * reference bit. We come back to it later 45860ce86c7SWei Liu * in the next iteration. (a simple LRU without 45960ce86c7SWei Liu * moving list elements around) 46060ce86c7SWei Liu */ 46160ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 46260ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 46360ce86c7SWei Liu continue; 46460ce86c7SWei Liu } 46560ce86c7SWei Liu /* 46660ce86c7SWei Liu * Add fids to reclaim list. 46760ce86c7SWei Liu */ 46860ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 46960ce86c7SWei Liu if (f->fs.fd != -1) { 47060ce86c7SWei Liu /* 47160ce86c7SWei Liu * Up the reference count so that 47260ce86c7SWei Liu * a clunk request won't free this fid 47360ce86c7SWei Liu */ 47460ce86c7SWei Liu f->ref++; 47581f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 47660ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 47760ce86c7SWei Liu f->fs.fd = -1; 47860ce86c7SWei Liu reclaim_count++; 47960ce86c7SWei Liu } 48060ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 481f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 48260ce86c7SWei Liu /* 48360ce86c7SWei Liu * Up the reference count so that 48460ce86c7SWei Liu * a clunk request won't free this fid 48560ce86c7SWei Liu */ 48660ce86c7SWei Liu f->ref++; 48781f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 488f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 489f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 49060ce86c7SWei Liu reclaim_count++; 49160ce86c7SWei Liu } 49260ce86c7SWei Liu } 49360ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 49460ce86c7SWei Liu break; 49560ce86c7SWei Liu } 49660ce86c7SWei Liu } 49760ce86c7SWei Liu /* 49860ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 49960ce86c7SWei Liu * are already clunked. 50060ce86c7SWei Liu */ 50181f9766bSGreg Kurz while (!QSLIST_EMPTY(&reclaim_list)) { 50281f9766bSGreg Kurz f = QSLIST_FIRST(&reclaim_list); 50381f9766bSGreg Kurz QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); 50460ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 50560ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 50660ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 50760ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 50860ce86c7SWei Liu } 50960ce86c7SWei Liu /* 51060ce86c7SWei Liu * Now drop the fid reference, free it 51160ce86c7SWei Liu * if clunked. 51260ce86c7SWei Liu */ 51360ce86c7SWei Liu put_fid(pdu, f); 51460ce86c7SWei Liu } 51560ce86c7SWei Liu } 51660ce86c7SWei Liu 5178440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 51860ce86c7SWei Liu { 51960ce86c7SWei Liu int err; 52060ce86c7SWei Liu V9fsState *s = pdu->s; 52120b7f45bSGreg Kurz V9fsFidState *fidp, *fidp_next; 52260ce86c7SWei Liu 52320b7f45bSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 52420b7f45bSGreg Kurz if (!fidp) { 52520b7f45bSGreg Kurz return 0; 52660ce86c7SWei Liu } 52720b7f45bSGreg Kurz 52820b7f45bSGreg Kurz /* 52920b7f45bSGreg Kurz * v9fs_reopen_fid() can yield : a reference on the fid must be held 53020b7f45bSGreg Kurz * to ensure its pointer remains valid and we can safely pass it to 53120b7f45bSGreg Kurz * QSIMPLEQ_NEXT(). The corresponding put_fid() can also yield so 53220b7f45bSGreg Kurz * we must keep a reference on the next fid as well. So the logic here 53320b7f45bSGreg Kurz * is to get a reference on a fid and only put it back during the next 53420b7f45bSGreg Kurz * iteration after we could get a reference on the next fid. Start with 53520b7f45bSGreg Kurz * the first one. 53620b7f45bSGreg Kurz */ 53720b7f45bSGreg Kurz for (fidp->ref++; fidp; fidp = fidp_next) { 53820b7f45bSGreg Kurz if (fidp->path.size == path->size && 53920b7f45bSGreg Kurz !memcmp(fidp->path.data, path->data, path->size)) { 54060ce86c7SWei Liu /* Mark the fid non reclaimable. */ 54160ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 54260ce86c7SWei Liu 54360ce86c7SWei Liu /* reopen the file/dir if already closed */ 54460ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 54560ce86c7SWei Liu if (err < 0) { 54620b7f45bSGreg Kurz put_fid(pdu, fidp); 547267fcadfSGreg Kurz return err; 54860ce86c7SWei Liu } 54920b7f45bSGreg Kurz } 55020b7f45bSGreg Kurz 55120b7f45bSGreg Kurz fidp_next = QSIMPLEQ_NEXT(fidp, next); 55220b7f45bSGreg Kurz 55320b7f45bSGreg Kurz if (fidp_next) { 55460ce86c7SWei Liu /* 55520b7f45bSGreg Kurz * Ensure the next fid survives a potential clunk request during 55620b7f45bSGreg Kurz * put_fid() below and v9fs_reopen_fid() in the next iteration. 55760ce86c7SWei Liu */ 55820b7f45bSGreg Kurz fidp_next->ref++; 55960ce86c7SWei Liu } 56020b7f45bSGreg Kurz 56120b7f45bSGreg Kurz /* We're done with this fid */ 56220b7f45bSGreg Kurz put_fid(pdu, fidp); 56360ce86c7SWei Liu } 56420b7f45bSGreg Kurz 56560ce86c7SWei Liu return 0; 56660ce86c7SWei Liu } 56760ce86c7SWei Liu 5688440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 56960ce86c7SWei Liu { 57060ce86c7SWei Liu V9fsState *s = pdu->s; 57179decce3SGreg Kurz V9fsFidState *fidp; 57260ce86c7SWei Liu 57360ce86c7SWei Liu /* Free all fids */ 574feabd6cfSGreg Kurz while (!QSIMPLEQ_EMPTY(&s->fid_list)) { 5756d54af0eSGreg Kurz /* Get fid */ 576feabd6cfSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 5776d54af0eSGreg Kurz fidp->ref++; 57860ce86c7SWei Liu 5796d54af0eSGreg Kurz /* Clunk fid */ 580feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 5812e53160fSGreg Kurz fidp->clunked = true; 5826d54af0eSGreg Kurz 5836d54af0eSGreg Kurz put_fid(pdu, fidp); 58460ce86c7SWei Liu } 58560ce86c7SWei Liu } 58660ce86c7SWei Liu 58760ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 58860ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 58960ce86c7SWei Liu 59060ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 59160ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 59260ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 59360ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 59460ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 59560ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 59660ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 59760ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 59860ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 59960ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 60060ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 60160ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 60260ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 60360ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 60460ce86c7SWei Liu 60560ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 60660ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 60760ce86c7SWei Liu P9_STAT_MODE_LINK | \ 60860ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 60960ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 61060ce86c7SWei Liu P9_STAT_MODE_SOCKET) 61160ce86c7SWei Liu 6126b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 6136b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 6146b6aa828SChristian Schoenebeck { 6156b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 6166b6aa828SChristian Schoenebeck } 6176b6aa828SChristian Schoenebeck 6186b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 6196b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 6206b6aa828SChristian Schoenebeck { 6216b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 6226b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 6236b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 6246b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 6256b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 6266b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 6276b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 6286b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 6296b6aa828SChristian Schoenebeck } 6306b6aa828SChristian Schoenebeck 631e16fea41SChristian Schoenebeck /* 632e16fea41SChristian Schoenebeck * Parameter k for the Exponential Golomb algorihm to be used. 6336b6aa828SChristian Schoenebeck * 6346b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6356b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6366b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6376b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6386b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6396b6aa828SChristian Schoenebeck * 6406b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6416b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6426b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6436b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6446b6aa828SChristian Schoenebeck * 645e16fea41SChristian Schoenebeck * IMPORTANT: In case this ever becomes a runtime parameter; the value of 6466b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6476b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6486b6aa828SChristian Schoenebeck */ 6496b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6506b6aa828SChristian Schoenebeck 6516b6aa828SChristian Schoenebeck /** 652e16fea41SChristian Schoenebeck * expGolombEncode() - Exponential Golomb algorithm for arbitrary k 653e16fea41SChristian Schoenebeck * (including k=0). 6546b6aa828SChristian Schoenebeck * 655e16fea41SChristian Schoenebeck * @n: natural number (or index) of the prefix to be generated 656e16fea41SChristian Schoenebeck * (1, 2, 3, ...) 657e16fea41SChristian Schoenebeck * @k: parameter k of Exp. Golomb algorithm to be used 658e16fea41SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 659e16fea41SChristian Schoenebeck * Return: prefix for given @n and @k 660e16fea41SChristian Schoenebeck * 661e16fea41SChristian Schoenebeck * The Exponential Golomb algorithm generates prefixes (NOT suffixes!) 6626b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6636b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6646b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6656b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6666b6aa828SChristian Schoenebeck * 6676b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 668e16fea41SChristian Schoenebeck * sense that lowest allowed index (@n) starts with 1, not with zero. 6696b6aa828SChristian Schoenebeck */ 6706b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6716b6aa828SChristian Schoenebeck { 6726b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6736b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6746b6aa828SChristian Schoenebeck return (VariLenAffix) { 6756b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6766b6aa828SChristian Schoenebeck .value = value, 6776b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6786b6aa828SChristian Schoenebeck }; 6796b6aa828SChristian Schoenebeck } 6806b6aa828SChristian Schoenebeck 6816b6aa828SChristian Schoenebeck /** 682e16fea41SChristian Schoenebeck * invertAffix() - Converts a suffix into a prefix, or a prefix into a suffix. 683e16fea41SChristian Schoenebeck * @affix: either suffix or prefix to be inverted 684e16fea41SChristian Schoenebeck * Return: inversion of passed @affix 6856b6aa828SChristian Schoenebeck * 6866b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6876b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6886b6aa828SChristian Schoenebeck * after the conversion. 6896b6aa828SChristian Schoenebeck * 6906b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6916b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6926b6aa828SChristian Schoenebeck * versa). 6936b6aa828SChristian Schoenebeck */ 6946b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6956b6aa828SChristian Schoenebeck { 6966b6aa828SChristian Schoenebeck return (VariLenAffix) { 6976b6aa828SChristian Schoenebeck .type = 6986b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6996b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 7006b6aa828SChristian Schoenebeck .value = 7016b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 7026b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 7036b6aa828SChristian Schoenebeck .bits = affix->bits 7046b6aa828SChristian Schoenebeck }; 7056b6aa828SChristian Schoenebeck } 7066b6aa828SChristian Schoenebeck 7076b6aa828SChristian Schoenebeck /** 708e16fea41SChristian Schoenebeck * affixForIndex() - Generates suffix numbers with "suffix-free" property. 709e16fea41SChristian Schoenebeck * @index: natural number (or index) of the suffix to be generated 710e16fea41SChristian Schoenebeck * (1, 2, 3, ...) 711e16fea41SChristian Schoenebeck * Return: Suffix suitable to assemble unique number. 7126b6aa828SChristian Schoenebeck * 7136b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 7146b6aa828SChristian Schoenebeck * 7156b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 7166b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 7176b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 7186b6aa828SChristian Schoenebeck */ 7196b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 7206b6aa828SChristian Schoenebeck { 7216b6aa828SChristian Schoenebeck VariLenAffix prefix; 7226b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 7236b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 7246b6aa828SChristian Schoenebeck } 7256b6aa828SChristian Schoenebeck 7261a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 7271a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 7281a6ed33cSAntonios Motakis { 7291a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 7301a6ed33cSAntonios Motakis } 7311a6ed33cSAntonios Motakis 732f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 733f3fe4a2dSAntonios Motakis { 734f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 735f3fe4a2dSAntonios Motakis } 736f3fe4a2dSAntonios Motakis 7376b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7386b6aa828SChristian Schoenebeck { 7396b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7406b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7416b6aa828SChristian Schoenebeck } 7426b6aa828SChristian Schoenebeck 7436b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7441a6ed33cSAntonios Motakis { 7451a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7461a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7471a6ed33cSAntonios Motakis } 7481a6ed33cSAntonios Motakis 7496b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 750f3fe4a2dSAntonios Motakis { 751f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 752f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 753f3fe4a2dSAntonios Motakis } 754f3fe4a2dSAntonios Motakis 755f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7561a6ed33cSAntonios Motakis { 7571a6ed33cSAntonios Motakis g_free(p); 7581a6ed33cSAntonios Motakis } 7591a6ed33cSAntonios Motakis 760f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7611a6ed33cSAntonios Motakis { 7621a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7631a6ed33cSAntonios Motakis return; 7641a6ed33cSAntonios Motakis } 765f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7661a6ed33cSAntonios Motakis qht_destroy(ht); 7671a6ed33cSAntonios Motakis } 7681a6ed33cSAntonios Motakis 7696b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7706b6aa828SChristian Schoenebeck { 7716b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7726b6aa828SChristian Schoenebeck } 7736b6aa828SChristian Schoenebeck 7741a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7751a6ed33cSAntonios Motakis { 7766b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7771a6ed33cSAntonios Motakis } 7781a6ed33cSAntonios Motakis 779f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 780f3fe4a2dSAntonios Motakis { 7816b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 782f3fe4a2dSAntonios Motakis } 783f3fe4a2dSAntonios Motakis 7846b6aa828SChristian Schoenebeck /* 7856b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7866b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7876b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7886b6aa828SChristian Schoenebeck * 7896b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7906b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7916b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7926b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7936b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7946b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7956b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7966b6aa828SChristian Schoenebeck */ 7976b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7986b6aa828SChristian Schoenebeck { 7996b6aa828SChristian Schoenebeck QpdEntry lookup = { 8006b6aa828SChristian Schoenebeck .dev = dev 8016b6aa828SChristian Schoenebeck }, *val; 8026b6aa828SChristian Schoenebeck uint32_t hash = dev; 8036b6aa828SChristian Schoenebeck VariLenAffix affix; 8046b6aa828SChristian Schoenebeck 8056b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 8066b6aa828SChristian Schoenebeck if (!val) { 807*1366244aSMarkus Armbruster val = g_new0(QpdEntry, 1); 8086b6aa828SChristian Schoenebeck *val = lookup; 8096b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 8106b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 8116b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 8126b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 8136b6aa828SChristian Schoenebeck } 8146b6aa828SChristian Schoenebeck return val->prefix_bits; 8156b6aa828SChristian Schoenebeck } 8166b6aa828SChristian Schoenebeck 817e16fea41SChristian Schoenebeck /* 818e16fea41SChristian Schoenebeck * Slow / full mapping host inode nr -> guest inode nr. 8196b6aa828SChristian Schoenebeck * 8206b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 8216b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 8226b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 8236b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 8246b6aa828SChristian Schoenebeck * guest. 8256b6aa828SChristian Schoenebeck * 8266b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 8276b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 8286b6aa828SChristian Schoenebeck * expected ever to be used at all though. 8296b6aa828SChristian Schoenebeck * 830e16fea41SChristian Schoenebeck * See qid_path_suffixmap() for details 8316b6aa828SChristian Schoenebeck * 8326b6aa828SChristian Schoenebeck */ 833f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 834f3fe4a2dSAntonios Motakis uint64_t *path) 835f3fe4a2dSAntonios Motakis { 836f3fe4a2dSAntonios Motakis QpfEntry lookup = { 837f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 838f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 839f3fe4a2dSAntonios Motakis }, *val; 840f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8416b6aa828SChristian Schoenebeck VariLenAffix affix; 842f3fe4a2dSAntonios Motakis 843f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 844f3fe4a2dSAntonios Motakis 845f3fe4a2dSAntonios Motakis if (!val) { 846f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 847f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 848f3fe4a2dSAntonios Motakis error_report_once( 849f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 850f3fe4a2dSAntonios Motakis "host to guest." 851f3fe4a2dSAntonios Motakis ); 852f3fe4a2dSAntonios Motakis return -ENFILE; 853f3fe4a2dSAntonios Motakis } 854f3fe4a2dSAntonios Motakis 855*1366244aSMarkus Armbruster val = g_new0(QpfEntry, 1); 856f3fe4a2dSAntonios Motakis *val = lookup; 857f3fe4a2dSAntonios Motakis 858f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8596b6aa828SChristian Schoenebeck affix = affixForIndex( 8606b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8616b6aa828SChristian Schoenebeck ); 8626b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8636b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 864f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 865f3fe4a2dSAntonios Motakis } 866f3fe4a2dSAntonios Motakis 867f3fe4a2dSAntonios Motakis *path = val->path; 868f3fe4a2dSAntonios Motakis return 0; 869f3fe4a2dSAntonios Motakis } 870f3fe4a2dSAntonios Motakis 871e16fea41SChristian Schoenebeck /* 872e16fea41SChristian Schoenebeck * Quick mapping host inode nr -> guest inode nr. 8731a6ed33cSAntonios Motakis * 8746b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8756b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8766b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8776b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8786b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8796b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8806b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8816b6aa828SChristian Schoenebeck * that is). 8826b6aa828SChristian Schoenebeck * 8836b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8846b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8856b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8866b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8876b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8886b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8896b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8906b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8916b6aa828SChristian Schoenebeck * 8926b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8936b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8946b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8956b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8966b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8976b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8986b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8996b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 9006b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 9016b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 9026b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 9036b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 9046b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 9056b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 9066b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 9076b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 9086b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 9091a6ed33cSAntonios Motakis */ 9106b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 9111a6ed33cSAntonios Motakis uint64_t *path) 9121a6ed33cSAntonios Motakis { 9136b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 9141a6ed33cSAntonios Motakis QppEntry lookup = { 9151a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 9166b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 9171a6ed33cSAntonios Motakis }, *val; 9181a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 9191a6ed33cSAntonios Motakis 9201a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 9211a6ed33cSAntonios Motakis 9221a6ed33cSAntonios Motakis if (!val) { 9236b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 9246b6aa828SChristian Schoenebeck /* we ran out of affixes */ 925f3fe4a2dSAntonios Motakis warn_report_once( 926f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 9271a6ed33cSAntonios Motakis ); 9281a6ed33cSAntonios Motakis return -ENFILE; 9291a6ed33cSAntonios Motakis } 9301a6ed33cSAntonios Motakis 931*1366244aSMarkus Armbruster val = g_new0(QppEntry, 1); 9321a6ed33cSAntonios Motakis *val = lookup; 9331a6ed33cSAntonios Motakis 9346b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 9356b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 9366b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 9371a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9381a6ed33cSAntonios Motakis } 9396b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9406b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9411a6ed33cSAntonios Motakis return 0; 9421a6ed33cSAntonios Motakis } 9431a6ed33cSAntonios Motakis 9443b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 94560ce86c7SWei Liu { 9461a6ed33cSAntonios Motakis int err; 94760ce86c7SWei Liu size_t size; 94860ce86c7SWei Liu 9491a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9501a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9516b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 952f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 953f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 954f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 955f3fe4a2dSAntonios Motakis } 9561a6ed33cSAntonios Motakis if (err) { 9571a6ed33cSAntonios Motakis return err; 9581a6ed33cSAntonios Motakis } 9591a6ed33cSAntonios Motakis } else { 9603b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9611a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9621a6ed33cSAntonios Motakis error_report_once( 9631a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9641a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9651a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9661a6ed33cSAntonios Motakis "effective." 9671a6ed33cSAntonios Motakis ); 9681a6ed33cSAntonios Motakis return -ENODEV; 9691a6ed33cSAntonios Motakis } else { 9703b5ee9e8SAntonios Motakis warn_report_once( 9713b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9723b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9731a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9741a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9751a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9763b5ee9e8SAntonios Motakis ); 9773b5ee9e8SAntonios Motakis } 9781a6ed33cSAntonios Motakis } 97960ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 98060ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 98160ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9821a6ed33cSAntonios Motakis } 9831a6ed33cSAntonios Motakis 98460ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 98560ce86c7SWei Liu qidp->type = 0; 98660ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 98760ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 98860ce86c7SWei Liu } 98960ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 99060ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 99160ce86c7SWei Liu } 9923b5ee9e8SAntonios Motakis 9933b5ee9e8SAntonios Motakis return 0; 99460ce86c7SWei Liu } 99560ce86c7SWei Liu 99660ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 99760ce86c7SWei Liu { 99860ce86c7SWei Liu V9fsPDU *pdu = NULL; 99960ce86c7SWei Liu 100060ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 100160ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 100260ce86c7SWei Liu QLIST_REMOVE(pdu, next); 100360ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 100460ce86c7SWei Liu } 100560ce86c7SWei Liu return pdu; 100660ce86c7SWei Liu } 100760ce86c7SWei Liu 100860ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 100960ce86c7SWei Liu { 101060ce86c7SWei Liu V9fsState *s = pdu->s; 1011f74e27bfSGreg Kurz 1012f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 101360ce86c7SWei Liu QLIST_REMOVE(pdu, next); 101460ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 101560ce86c7SWei Liu } 101660ce86c7SWei Liu 10178440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 101860ce86c7SWei Liu { 101960ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 102060ce86c7SWei Liu V9fsState *s = pdu->s; 102106a37db7SGreg Kurz int ret; 102260ce86c7SWei Liu 1023fc78d5eeSKeno Fischer /* 1024fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1025fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1026fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1027fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1028fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1029fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1030fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1031fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1032fc78d5eeSKeno Fischer * transmission of the reply. 1033fc78d5eeSKeno Fischer */ 1034fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1035fc78d5eeSKeno Fischer if (discard) { 1036fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1037fc78d5eeSKeno Fischer pdu->size = 0; 1038fc78d5eeSKeno Fischer goto out_notify; 1039fc78d5eeSKeno Fischer } 1040fc78d5eeSKeno Fischer 104160ce86c7SWei Liu if (len < 0) { 104260ce86c7SWei Liu int err = -len; 104360ce86c7SWei Liu len = 7; 104460ce86c7SWei Liu 104560ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 104660ce86c7SWei Liu V9fsString str; 104760ce86c7SWei Liu 104860ce86c7SWei Liu str.data = strerror(err); 104960ce86c7SWei Liu str.size = strlen(str.data); 105060ce86c7SWei Liu 105106a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 105206a37db7SGreg Kurz if (ret < 0) { 105306a37db7SGreg Kurz goto out_notify; 105406a37db7SGreg Kurz } 105506a37db7SGreg Kurz len += ret; 105660ce86c7SWei Liu id = P9_RERROR; 105760ce86c7SWei Liu } 105860ce86c7SWei Liu 105906a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 106006a37db7SGreg Kurz if (ret < 0) { 106106a37db7SGreg Kurz goto out_notify; 106206a37db7SGreg Kurz } 106306a37db7SGreg Kurz len += ret; 106460ce86c7SWei Liu 106560ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 106660ce86c7SWei Liu id = P9_RLERROR; 106760ce86c7SWei Liu } 106860ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 106960ce86c7SWei Liu } 107060ce86c7SWei Liu 107160ce86c7SWei Liu /* fill out the header */ 107206a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 107306a37db7SGreg Kurz goto out_notify; 107406a37db7SGreg Kurz } 107560ce86c7SWei Liu 107660ce86c7SWei Liu /* keep these in sync */ 107760ce86c7SWei Liu pdu->size = len; 107860ce86c7SWei Liu pdu->id = id; 107960ce86c7SWei Liu 108006a37db7SGreg Kurz out_notify: 1081a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 108260ce86c7SWei Liu 108360ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1084f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 108560ce86c7SWei Liu pdu_free(pdu); 108660ce86c7SWei Liu } 1087f74e27bfSGreg Kurz } 108860ce86c7SWei Liu 108960ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 109060ce86c7SWei Liu { 109160ce86c7SWei Liu mode_t ret; 109260ce86c7SWei Liu 109360ce86c7SWei Liu ret = mode & 0777; 109460ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 109560ce86c7SWei Liu ret |= S_IFDIR; 109660ce86c7SWei Liu } 109760ce86c7SWei Liu 109860ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 109960ce86c7SWei Liu ret |= S_IFLNK; 110060ce86c7SWei Liu } 110160ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 110260ce86c7SWei Liu ret |= S_IFSOCK; 110360ce86c7SWei Liu } 110460ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 110560ce86c7SWei Liu ret |= S_IFIFO; 110660ce86c7SWei Liu } 110760ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 110860ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 110960ce86c7SWei Liu ret |= S_IFCHR; 111060ce86c7SWei Liu } else { 111160ce86c7SWei Liu ret |= S_IFBLK; 111260ce86c7SWei Liu } 111360ce86c7SWei Liu } 111460ce86c7SWei Liu 111560ce86c7SWei Liu if (!(ret & ~0777)) { 111660ce86c7SWei Liu ret |= S_IFREG; 111760ce86c7SWei Liu } 111860ce86c7SWei Liu 111960ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 112060ce86c7SWei Liu ret |= S_ISUID; 112160ce86c7SWei Liu } 112260ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 112360ce86c7SWei Liu ret |= S_ISGID; 112460ce86c7SWei Liu } 112560ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 112660ce86c7SWei Liu ret |= S_ISVTX; 112760ce86c7SWei Liu } 112860ce86c7SWei Liu 112960ce86c7SWei Liu return ret; 113060ce86c7SWei Liu } 113160ce86c7SWei Liu 113260ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 113360ce86c7SWei Liu { 113460ce86c7SWei Liu if (stat->type == -1 && 113560ce86c7SWei Liu stat->dev == -1 && 113687032833SAntonios Motakis stat->qid.type == 0xff && 113787032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 113887032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 113960ce86c7SWei Liu stat->mode == -1 && 114060ce86c7SWei Liu stat->atime == -1 && 114160ce86c7SWei Liu stat->mtime == -1 && 114260ce86c7SWei Liu stat->length == -1 && 114360ce86c7SWei Liu !stat->name.size && 114460ce86c7SWei Liu !stat->uid.size && 114560ce86c7SWei Liu !stat->gid.size && 114660ce86c7SWei Liu !stat->muid.size && 114760ce86c7SWei Liu stat->n_uid == -1 && 114860ce86c7SWei Liu stat->n_gid == -1 && 114960ce86c7SWei Liu stat->n_muid == -1) { 115060ce86c7SWei Liu return 1; 115160ce86c7SWei Liu } 115260ce86c7SWei Liu 115360ce86c7SWei Liu return 0; 115460ce86c7SWei Liu } 115560ce86c7SWei Liu 115660ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 115760ce86c7SWei Liu { 115860ce86c7SWei Liu v9fs_string_init(&stat->name); 115960ce86c7SWei Liu v9fs_string_init(&stat->uid); 116060ce86c7SWei Liu v9fs_string_init(&stat->gid); 116160ce86c7SWei Liu v9fs_string_init(&stat->muid); 116260ce86c7SWei Liu v9fs_string_init(&stat->extension); 116360ce86c7SWei Liu } 116460ce86c7SWei Liu 116560ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 116660ce86c7SWei Liu { 116760ce86c7SWei Liu v9fs_string_free(&stat->name); 116860ce86c7SWei Liu v9fs_string_free(&stat->uid); 116960ce86c7SWei Liu v9fs_string_free(&stat->gid); 117060ce86c7SWei Liu v9fs_string_free(&stat->muid); 117160ce86c7SWei Liu v9fs_string_free(&stat->extension); 117260ce86c7SWei Liu } 117360ce86c7SWei Liu 117460ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 117560ce86c7SWei Liu { 117660ce86c7SWei Liu uint32_t mode; 117760ce86c7SWei Liu 117860ce86c7SWei Liu mode = stbuf->st_mode & 0777; 117960ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 118060ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 118160ce86c7SWei Liu } 118260ce86c7SWei Liu 118360ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 118460ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 118560ce86c7SWei Liu } 118660ce86c7SWei Liu 118760ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 118860ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 118960ce86c7SWei Liu } 119060ce86c7SWei Liu 119160ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 119260ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 119360ce86c7SWei Liu } 119460ce86c7SWei Liu 119560ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 119660ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 119760ce86c7SWei Liu } 119860ce86c7SWei Liu 119960ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 120060ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 120160ce86c7SWei Liu } 120260ce86c7SWei Liu 120360ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 120460ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 120560ce86c7SWei Liu } 120660ce86c7SWei Liu 120760ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 120860ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 120960ce86c7SWei Liu } 121060ce86c7SWei Liu 121160ce86c7SWei Liu return mode; 121260ce86c7SWei Liu } 121360ce86c7SWei Liu 12146069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 12156069537fSJan Dakinevich const char *basename, 121660ce86c7SWei Liu const struct stat *stbuf, 121760ce86c7SWei Liu V9fsStat *v9stat) 121860ce86c7SWei Liu { 121960ce86c7SWei Liu int err; 122060ce86c7SWei Liu 122160ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 122260ce86c7SWei Liu 12233b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12243b5ee9e8SAntonios Motakis if (err < 0) { 12253b5ee9e8SAntonios Motakis return err; 12263b5ee9e8SAntonios Motakis } 122760ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 122860ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 122960ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 123060ce86c7SWei Liu v9stat->length = stbuf->st_size; 123160ce86c7SWei Liu 1232abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1233abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1234abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 123560ce86c7SWei Liu 123660ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 123760ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 123860ce86c7SWei Liu v9stat->n_muid = 0; 123960ce86c7SWei Liu 1240abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 124160ce86c7SWei Liu 124260ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12436069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 124460ce86c7SWei Liu if (err < 0) { 124560ce86c7SWei Liu return err; 124660ce86c7SWei Liu } 124760ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 124860ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 124960ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 125060ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 125160ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 125260ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 125360ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 125460ce86c7SWei Liu } 125560ce86c7SWei Liu 12566069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 125760ce86c7SWei Liu 125860ce86c7SWei Liu v9stat->size = 61 + 125960ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 126060ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 126160ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 126260ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 126360ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 126460ce86c7SWei Liu return 0; 126560ce86c7SWei Liu } 126660ce86c7SWei Liu 126760ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 126860ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 126960ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 127060ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 127160ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 127260ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 127360ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 127460ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 127560ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 127660ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 127760ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 127860ce86c7SWei Liu 127960ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 128060ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 128160ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 128260ce86c7SWei Liu 128360ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 128460ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 128560ce86c7SWei Liu 128660ce86c7SWei Liu 1287b565bccbSChristian Schoenebeck /** 1288e16fea41SChristian Schoenebeck * blksize_to_iounit() - Block size exposed to 9p client. 1289e16fea41SChristian Schoenebeck * Return: block size 1290b565bccbSChristian Schoenebeck * 1291b565bccbSChristian Schoenebeck * @pdu: 9p client request 1292b565bccbSChristian Schoenebeck * @blksize: host filesystem's block size 1293e16fea41SChristian Schoenebeck * 1294e16fea41SChristian Schoenebeck * Convert host filesystem's block size into an appropriate block size for 1295e16fea41SChristian Schoenebeck * 9p client (guest OS side). The value returned suggests an "optimum" block 1296e16fea41SChristian Schoenebeck * size for 9p I/O, i.e. to maximize performance. 1297b565bccbSChristian Schoenebeck */ 1298b565bccbSChristian Schoenebeck static int32_t blksize_to_iounit(const V9fsPDU *pdu, int32_t blksize) 1299669ced09SChristian Schoenebeck { 1300669ced09SChristian Schoenebeck int32_t iounit = 0; 1301669ced09SChristian Schoenebeck V9fsState *s = pdu->s; 1302669ced09SChristian Schoenebeck 1303669ced09SChristian Schoenebeck /* 1304b565bccbSChristian Schoenebeck * iounit should be multiples of blksize (host filesystem block size) 1305669ced09SChristian Schoenebeck * as well as less than (client msize - P9_IOHDRSZ) 1306669ced09SChristian Schoenebeck */ 1307b565bccbSChristian Schoenebeck if (blksize) { 130804a7f9e5SChristian Schoenebeck iounit = QEMU_ALIGN_DOWN(s->msize - P9_IOHDRSZ, blksize); 1309669ced09SChristian Schoenebeck } 1310669ced09SChristian Schoenebeck if (!iounit) { 1311669ced09SChristian Schoenebeck iounit = s->msize - P9_IOHDRSZ; 1312669ced09SChristian Schoenebeck } 1313669ced09SChristian Schoenebeck return iounit; 1314669ced09SChristian Schoenebeck } 1315669ced09SChristian Schoenebeck 1316b565bccbSChristian Schoenebeck static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf) 1317b565bccbSChristian Schoenebeck { 1318b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, stbuf->st_blksize); 1319b565bccbSChristian Schoenebeck } 1320b565bccbSChristian Schoenebeck 13213b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 132260ce86c7SWei Liu V9fsStatDotl *v9lstat) 132360ce86c7SWei Liu { 132460ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 132560ce86c7SWei Liu 132660ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 132760ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 132860ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 132960ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 133060ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 133160ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 1332669ced09SChristian Schoenebeck v9lstat->st_blksize = stat_to_iounit(pdu, stbuf); 133360ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 133460ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 133560ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 133660ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 1337f41db099SKeno Fischer #ifdef CONFIG_DARWIN 1338f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atimespec.tv_nsec; 1339f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtimespec.tv_nsec; 1340f41db099SKeno Fischer v9lstat->st_ctime_nsec = stbuf->st_ctimespec.tv_nsec; 1341f41db099SKeno Fischer #else 1342f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 1343f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 134460ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 1345f41db099SKeno Fischer #endif 134660ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 134760ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 134860ce86c7SWei Liu 13493b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 135060ce86c7SWei Liu } 135160ce86c7SWei Liu 135260ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 135360ce86c7SWei Liu { 135460ce86c7SWei Liu int i; 135560ce86c7SWei Liu 135660ce86c7SWei Liu printf("sg[%d]: {", cnt); 135760ce86c7SWei Liu for (i = 0; i < cnt; i++) { 135860ce86c7SWei Liu if (i) { 135960ce86c7SWei Liu printf(", "); 136060ce86c7SWei Liu } 136160ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 136260ce86c7SWei Liu } 136360ce86c7SWei Liu printf("}\n"); 136460ce86c7SWei Liu } 136560ce86c7SWei Liu 136660ce86c7SWei Liu /* Will call this only for path name based fid */ 136760ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 136860ce86c7SWei Liu { 136960ce86c7SWei Liu V9fsPath str; 137060ce86c7SWei Liu v9fs_path_init(&str); 137160ce86c7SWei Liu v9fs_path_copy(&str, dst); 1372e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 137360ce86c7SWei Liu v9fs_path_free(&str); 137460ce86c7SWei Liu } 137560ce86c7SWei Liu 137660ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 137760ce86c7SWei Liu { 137860ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 137960ce86c7SWei Liu } 138060ce86c7SWei Liu 13818440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 138260ce86c7SWei Liu { 138360ce86c7SWei Liu ssize_t err; 138460ce86c7SWei Liu V9fsPDU *pdu = opaque; 138560ce86c7SWei Liu V9fsState *s = pdu->s; 138660ce86c7SWei Liu V9fsString version; 138760ce86c7SWei Liu size_t offset = 7; 138860ce86c7SWei Liu 138960ce86c7SWei Liu v9fs_string_init(&version); 139060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 139160ce86c7SWei Liu if (err < 0) { 139260ce86c7SWei Liu goto out; 139360ce86c7SWei Liu } 139460ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 139560ce86c7SWei Liu 139660ce86c7SWei Liu virtfs_reset(pdu); 139760ce86c7SWei Liu 139860ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 139960ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 140060ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 140160ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 140260ce86c7SWei Liu } else { 140360ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1404e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1405e16453a3SChristian Schoenebeck goto marshal; 140660ce86c7SWei Liu } 140760ce86c7SWei Liu 1408e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1409e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1410e16453a3SChristian Schoenebeck error_report( 1411e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1412e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1413e16453a3SChristian Schoenebeck ); 1414e16453a3SChristian Schoenebeck goto out; 1415e16453a3SChristian Schoenebeck } 1416e16453a3SChristian Schoenebeck 141762777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1418c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 141962777d82SChristian Schoenebeck warn_report_once( 142062777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 142162777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 142262777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 142362777d82SChristian Schoenebeck ); 142462777d82SChristian Schoenebeck } 142562777d82SChristian Schoenebeck 1426e16453a3SChristian Schoenebeck marshal: 142760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 142860ce86c7SWei Liu if (err < 0) { 142960ce86c7SWei Liu goto out; 143060ce86c7SWei Liu } 1431403a905bSPhilippe Mathieu-Daudé err += offset; 143260ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 143360ce86c7SWei Liu out: 1434403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 143560ce86c7SWei Liu v9fs_string_free(&version); 143660ce86c7SWei Liu } 143760ce86c7SWei Liu 14388440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 143960ce86c7SWei Liu { 144060ce86c7SWei Liu V9fsPDU *pdu = opaque; 144160ce86c7SWei Liu V9fsState *s = pdu->s; 144260ce86c7SWei Liu int32_t fid, afid, n_uname; 144360ce86c7SWei Liu V9fsString uname, aname; 144460ce86c7SWei Liu V9fsFidState *fidp; 144560ce86c7SWei Liu size_t offset = 7; 144660ce86c7SWei Liu V9fsQID qid; 144760ce86c7SWei Liu ssize_t err; 144811024375SChristian Schoenebeck struct stat stbuf; 144960ce86c7SWei Liu 145060ce86c7SWei Liu v9fs_string_init(&uname); 145160ce86c7SWei Liu v9fs_string_init(&aname); 145260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 145360ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 145460ce86c7SWei Liu if (err < 0) { 145560ce86c7SWei Liu goto out_nofid; 145660ce86c7SWei Liu } 145760ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 145860ce86c7SWei Liu 145960ce86c7SWei Liu fidp = alloc_fid(s, fid); 146060ce86c7SWei Liu if (fidp == NULL) { 146160ce86c7SWei Liu err = -EINVAL; 146260ce86c7SWei Liu goto out_nofid; 146360ce86c7SWei Liu } 146460ce86c7SWei Liu fidp->uid = n_uname; 146560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 146660ce86c7SWei Liu if (err < 0) { 146760ce86c7SWei Liu err = -EINVAL; 146860ce86c7SWei Liu clunk_fid(s, fid); 146960ce86c7SWei Liu goto out; 147060ce86c7SWei Liu } 147111024375SChristian Schoenebeck err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 147211024375SChristian Schoenebeck if (err < 0) { 147311024375SChristian Schoenebeck err = -EINVAL; 147411024375SChristian Schoenebeck clunk_fid(s, fid); 147511024375SChristian Schoenebeck goto out; 147611024375SChristian Schoenebeck } 147711024375SChristian Schoenebeck err = stat_to_qid(pdu, &stbuf, &qid); 147860ce86c7SWei Liu if (err < 0) { 147960ce86c7SWei Liu err = -EINVAL; 148060ce86c7SWei Liu clunk_fid(s, fid); 148160ce86c7SWei Liu goto out; 148260ce86c7SWei Liu } 1483fe44dc91SAshijeet Acharya 1484fe44dc91SAshijeet Acharya /* 1485fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1486fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1487fe44dc91SAshijeet Acharya */ 1488fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1489fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1490fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1491fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14929261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14939261ef5eSMarkus Armbruster if (err < 0) { 1494fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1495fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1496fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1497fe44dc91SAshijeet Acharya goto out; 1498fe44dc91SAshijeet Acharya } 1499fe44dc91SAshijeet Acharya s->root_fid = fid; 1500fe44dc91SAshijeet Acharya } 1501fe44dc91SAshijeet Acharya 150260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 150360ce86c7SWei Liu if (err < 0) { 150460ce86c7SWei Liu clunk_fid(s, fid); 150560ce86c7SWei Liu goto out; 150660ce86c7SWei Liu } 150760ce86c7SWei Liu err += offset; 1508fe44dc91SAshijeet Acharya 150911024375SChristian Schoenebeck memcpy(&s->root_st, &stbuf, sizeof(stbuf)); 151060ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 151160ce86c7SWei Liu qid.type, qid.version, qid.path); 151260ce86c7SWei Liu out: 151360ce86c7SWei Liu put_fid(pdu, fidp); 151460ce86c7SWei Liu out_nofid: 151560ce86c7SWei Liu pdu_complete(pdu, err); 151660ce86c7SWei Liu v9fs_string_free(&uname); 151760ce86c7SWei Liu v9fs_string_free(&aname); 151860ce86c7SWei Liu } 151960ce86c7SWei Liu 15208440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 152160ce86c7SWei Liu { 152260ce86c7SWei Liu int32_t fid; 152360ce86c7SWei Liu V9fsStat v9stat; 152460ce86c7SWei Liu ssize_t err = 0; 152560ce86c7SWei Liu size_t offset = 7; 152660ce86c7SWei Liu struct stat stbuf; 152760ce86c7SWei Liu V9fsFidState *fidp; 152860ce86c7SWei Liu V9fsPDU *pdu = opaque; 15296069537fSJan Dakinevich char *basename; 153060ce86c7SWei Liu 153160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 153260ce86c7SWei Liu if (err < 0) { 153360ce86c7SWei Liu goto out_nofid; 153460ce86c7SWei Liu } 153560ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 153660ce86c7SWei Liu 153760ce86c7SWei Liu fidp = get_fid(pdu, fid); 153860ce86c7SWei Liu if (fidp == NULL) { 153960ce86c7SWei Liu err = -ENOENT; 154060ce86c7SWei Liu goto out_nofid; 154160ce86c7SWei Liu } 154260ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 154360ce86c7SWei Liu if (err < 0) { 154460ce86c7SWei Liu goto out; 154560ce86c7SWei Liu } 15466069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 15476069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 15486069537fSJan Dakinevich g_free(basename); 154960ce86c7SWei Liu if (err < 0) { 155060ce86c7SWei Liu goto out; 155160ce86c7SWei Liu } 155260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 155360ce86c7SWei Liu if (err < 0) { 155460ce86c7SWei Liu v9fs_stat_free(&v9stat); 155560ce86c7SWei Liu goto out; 155660ce86c7SWei Liu } 155760ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 155860ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 155960ce86c7SWei Liu err += offset; 156060ce86c7SWei Liu v9fs_stat_free(&v9stat); 156160ce86c7SWei Liu out: 156260ce86c7SWei Liu put_fid(pdu, fidp); 156360ce86c7SWei Liu out_nofid: 156460ce86c7SWei Liu pdu_complete(pdu, err); 156560ce86c7SWei Liu } 156660ce86c7SWei Liu 15678440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 156860ce86c7SWei Liu { 156960ce86c7SWei Liu int32_t fid; 157060ce86c7SWei Liu size_t offset = 7; 157160ce86c7SWei Liu ssize_t retval = 0; 157260ce86c7SWei Liu struct stat stbuf; 157360ce86c7SWei Liu V9fsFidState *fidp; 157460ce86c7SWei Liu uint64_t request_mask; 157560ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 157660ce86c7SWei Liu V9fsPDU *pdu = opaque; 157760ce86c7SWei Liu 157860ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 157960ce86c7SWei Liu if (retval < 0) { 158060ce86c7SWei Liu goto out_nofid; 158160ce86c7SWei Liu } 158260ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 158360ce86c7SWei Liu 158460ce86c7SWei Liu fidp = get_fid(pdu, fid); 158560ce86c7SWei Liu if (fidp == NULL) { 158660ce86c7SWei Liu retval = -ENOENT; 158760ce86c7SWei Liu goto out_nofid; 158860ce86c7SWei Liu } 158960ce86c7SWei Liu /* 159060ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 159160ce86c7SWei Liu * need to look at request_mask. 159260ce86c7SWei Liu */ 159360ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 159460ce86c7SWei Liu if (retval < 0) { 159560ce86c7SWei Liu goto out; 159660ce86c7SWei Liu } 15973b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15983b5ee9e8SAntonios Motakis if (retval < 0) { 15993b5ee9e8SAntonios Motakis goto out; 16003b5ee9e8SAntonios Motakis } 160160ce86c7SWei Liu 160260ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 160360ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 160460ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 160560ce86c7SWei Liu switch (retval) { 160660ce86c7SWei Liu case 0: 160760ce86c7SWei Liu /* we have valid st_gen: update result mask */ 160860ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 160960ce86c7SWei Liu break; 161060ce86c7SWei Liu case -EINTR: 161160ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 161260ce86c7SWei Liu goto out; 161360ce86c7SWei Liu default: 161460ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 161560ce86c7SWei Liu break; 161660ce86c7SWei Liu } 161760ce86c7SWei Liu } 161860ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 161960ce86c7SWei Liu if (retval < 0) { 162060ce86c7SWei Liu goto out; 162160ce86c7SWei Liu } 162260ce86c7SWei Liu retval += offset; 162360ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 162460ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 162560ce86c7SWei Liu v9stat_dotl.st_gid); 162660ce86c7SWei Liu out: 162760ce86c7SWei Liu put_fid(pdu, fidp); 162860ce86c7SWei Liu out_nofid: 162960ce86c7SWei Liu pdu_complete(pdu, retval); 163060ce86c7SWei Liu } 163160ce86c7SWei Liu 163260ce86c7SWei Liu /* Attribute flags */ 163360ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 163460ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 163560ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 163660ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 163760ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 163860ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 163960ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 164060ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 164160ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 164260ce86c7SWei Liu 164360ce86c7SWei Liu #define P9_ATTR_MASK 127 164460ce86c7SWei Liu 16458440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 164660ce86c7SWei Liu { 164760ce86c7SWei Liu int err = 0; 164860ce86c7SWei Liu int32_t fid; 164960ce86c7SWei Liu V9fsFidState *fidp; 165060ce86c7SWei Liu size_t offset = 7; 165160ce86c7SWei Liu V9fsIattr v9iattr; 165260ce86c7SWei Liu V9fsPDU *pdu = opaque; 165360ce86c7SWei Liu 165460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 165560ce86c7SWei Liu if (err < 0) { 165660ce86c7SWei Liu goto out_nofid; 165760ce86c7SWei Liu } 165860ce86c7SWei Liu 16598f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16608f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16618f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16628f9c64bfSGreg Kurz 166360ce86c7SWei Liu fidp = get_fid(pdu, fid); 166460ce86c7SWei Liu if (fidp == NULL) { 166560ce86c7SWei Liu err = -EINVAL; 166660ce86c7SWei Liu goto out_nofid; 166760ce86c7SWei Liu } 166860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 166960ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 167060ce86c7SWei Liu if (err < 0) { 167160ce86c7SWei Liu goto out; 167260ce86c7SWei Liu } 167360ce86c7SWei Liu } 167460ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 167560ce86c7SWei Liu struct timespec times[2]; 167660ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 167760ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 167860ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 167960ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 168060ce86c7SWei Liu } else { 168160ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 168260ce86c7SWei Liu } 168360ce86c7SWei Liu } else { 168460ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 168560ce86c7SWei Liu } 168660ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 168760ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 168860ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 168960ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 169060ce86c7SWei Liu } else { 169160ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 169260ce86c7SWei Liu } 169360ce86c7SWei Liu } else { 169460ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 169560ce86c7SWei Liu } 169660ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 169760ce86c7SWei Liu if (err < 0) { 169860ce86c7SWei Liu goto out; 169960ce86c7SWei Liu } 170060ce86c7SWei Liu } 170160ce86c7SWei Liu /* 170260ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 170360ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 170460ce86c7SWei Liu */ 170560ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 170660ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 170760ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 170860ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 170960ce86c7SWei Liu v9iattr.uid = -1; 171060ce86c7SWei Liu } 171160ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 171260ce86c7SWei Liu v9iattr.gid = -1; 171360ce86c7SWei Liu } 171460ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 171560ce86c7SWei Liu v9iattr.gid); 171660ce86c7SWei Liu if (err < 0) { 171760ce86c7SWei Liu goto out; 171860ce86c7SWei Liu } 171960ce86c7SWei Liu } 172060ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 172160ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 172260ce86c7SWei Liu if (err < 0) { 172360ce86c7SWei Liu goto out; 172460ce86c7SWei Liu } 172560ce86c7SWei Liu } 172660ce86c7SWei Liu err = offset; 17278f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 172860ce86c7SWei Liu out: 172960ce86c7SWei Liu put_fid(pdu, fidp); 173060ce86c7SWei Liu out_nofid: 173160ce86c7SWei Liu pdu_complete(pdu, err); 173260ce86c7SWei Liu } 173360ce86c7SWei Liu 173460ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 173560ce86c7SWei Liu { 173660ce86c7SWei Liu int i; 173760ce86c7SWei Liu ssize_t err; 173860ce86c7SWei Liu size_t offset = 7; 173960ce86c7SWei Liu 174060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 174160ce86c7SWei Liu if (err < 0) { 174260ce86c7SWei Liu return err; 174360ce86c7SWei Liu } 174460ce86c7SWei Liu offset += err; 174560ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 174660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 174760ce86c7SWei Liu if (err < 0) { 174860ce86c7SWei Liu return err; 174960ce86c7SWei Liu } 175060ce86c7SWei Liu offset += err; 175160ce86c7SWei Liu } 175260ce86c7SWei Liu return offset; 175360ce86c7SWei Liu } 175460ce86c7SWei Liu 1755fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1756fff39a7aSGreg Kurz { 1757fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1758fff39a7aSGreg Kurz } 1759fff39a7aSGreg Kurz 1760f22cad42SChristian Schoenebeck static bool same_stat_id(const struct stat *a, const struct stat *b) 176156f101ecSGreg Kurz { 1762f22cad42SChristian Schoenebeck return a->st_dev == b->st_dev && a->st_ino == b->st_ino; 176356f101ecSGreg Kurz } 176456f101ecSGreg Kurz 17658440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 176660ce86c7SWei Liu { 176760ce86c7SWei Liu int name_idx; 1768869605b5SChristian Schoenebeck g_autofree V9fsQID *qids = NULL; 176960ce86c7SWei Liu int i, err = 0; 17707e985780SChristian Schoenebeck V9fsPath dpath, path; 17717e985780SChristian Schoenebeck P9ARRAY_REF(V9fsPath) pathes = NULL; 177260ce86c7SWei Liu uint16_t nwnames; 1773869605b5SChristian Schoenebeck struct stat stbuf, fidst; 1774869605b5SChristian Schoenebeck g_autofree struct stat *stbufs = NULL; 177560ce86c7SWei Liu size_t offset = 7; 177660ce86c7SWei Liu int32_t fid, newfid; 17777e985780SChristian Schoenebeck P9ARRAY_REF(V9fsString) wnames = NULL; 177860ce86c7SWei Liu V9fsFidState *fidp; 177960ce86c7SWei Liu V9fsFidState *newfidp = NULL; 178060ce86c7SWei Liu V9fsPDU *pdu = opaque; 178160ce86c7SWei Liu V9fsState *s = pdu->s; 178256f101ecSGreg Kurz V9fsQID qid; 178360ce86c7SWei Liu 178460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 178560ce86c7SWei Liu if (err < 0) { 178660ce86c7SWei Liu pdu_complete(pdu, err); 178760ce86c7SWei Liu return ; 178860ce86c7SWei Liu } 178960ce86c7SWei Liu offset += err; 179060ce86c7SWei Liu 179160ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 179260ce86c7SWei Liu 1793232a4d2cSChristian Schoenebeck if (nwnames > P9_MAXWELEM) { 1794232a4d2cSChristian Schoenebeck err = -EINVAL; 1795232a4d2cSChristian Schoenebeck goto out_nofid; 1796232a4d2cSChristian Schoenebeck } 1797232a4d2cSChristian Schoenebeck if (nwnames) { 17987e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsString, wnames, nwnames); 17991923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 18008d6cb100SChristian Schoenebeck stbufs = g_new0(struct stat, nwnames); 18017e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsPath, pathes, nwnames); 180260ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 180360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 180460ce86c7SWei Liu if (err < 0) { 180560ce86c7SWei Liu goto out_nofid; 180660ce86c7SWei Liu } 1807fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1808fff39a7aSGreg Kurz err = -ENOENT; 1809fff39a7aSGreg Kurz goto out_nofid; 1810fff39a7aSGreg Kurz } 181160ce86c7SWei Liu offset += err; 181260ce86c7SWei Liu } 181360ce86c7SWei Liu } 181460ce86c7SWei Liu fidp = get_fid(pdu, fid); 181560ce86c7SWei Liu if (fidp == NULL) { 181660ce86c7SWei Liu err = -ENOENT; 181760ce86c7SWei Liu goto out_nofid; 181860ce86c7SWei Liu } 181956f101ecSGreg Kurz 182013fd08e6SGreg Kurz v9fs_path_init(&dpath); 182113fd08e6SGreg Kurz v9fs_path_init(&path); 182260ce86c7SWei Liu /* 18238d6cb100SChristian Schoenebeck * Both dpath and path initially point to fidp. 182460ce86c7SWei Liu * Needed to handle request with nwnames == 0 182560ce86c7SWei Liu */ 182660ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 182760ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 18288d6cb100SChristian Schoenebeck 18298d6cb100SChristian Schoenebeck /* 18308d6cb100SChristian Schoenebeck * To keep latency (i.e. overall execution time for processing this 18318d6cb100SChristian Schoenebeck * Twalk client request) as small as possible, run all the required fs 18328d6cb100SChristian Schoenebeck * driver code altogether inside the following block. 18338d6cb100SChristian Schoenebeck */ 18348d6cb100SChristian Schoenebeck v9fs_co_run_in_worker({ 18358d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18368d6cb100SChristian Schoenebeck err = -EINTR; 18378d6cb100SChristian Schoenebeck break; 18388d6cb100SChristian Schoenebeck } 18398d6cb100SChristian Schoenebeck err = s->ops->lstat(&s->ctx, &dpath, &fidst); 18408d6cb100SChristian Schoenebeck if (err < 0) { 18418d6cb100SChristian Schoenebeck err = -errno; 18428d6cb100SChristian Schoenebeck break; 18438d6cb100SChristian Schoenebeck } 18448d6cb100SChristian Schoenebeck stbuf = fidst; 184560ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 18468d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18478d6cb100SChristian Schoenebeck err = -EINTR; 18488d6cb100SChristian Schoenebeck break; 18498d6cb100SChristian Schoenebeck } 1850f22cad42SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18518d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18528d6cb100SChristian Schoenebeck { 18538d6cb100SChristian Schoenebeck err = s->ops->name_to_path(&s->ctx, &dpath, 185497b1d8fdSChristian Schoenebeck wnames[name_idx].data, 185597b1d8fdSChristian Schoenebeck &pathes[name_idx]); 18568d6cb100SChristian Schoenebeck if (err < 0) { 18578d6cb100SChristian Schoenebeck err = -errno; 18588d6cb100SChristian Schoenebeck break; 18598d6cb100SChristian Schoenebeck } 18608d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18618d6cb100SChristian Schoenebeck err = -EINTR; 18628d6cb100SChristian Schoenebeck break; 18638d6cb100SChristian Schoenebeck } 186497b1d8fdSChristian Schoenebeck err = s->ops->lstat(&s->ctx, &pathes[name_idx], &stbuf); 18658d6cb100SChristian Schoenebeck if (err < 0) { 18668d6cb100SChristian Schoenebeck err = -errno; 18678d6cb100SChristian Schoenebeck break; 18688d6cb100SChristian Schoenebeck } 18698d6cb100SChristian Schoenebeck stbufs[name_idx] = stbuf; 187097b1d8fdSChristian Schoenebeck v9fs_path_copy(&dpath, &pathes[name_idx]); 18718d6cb100SChristian Schoenebeck } 18728d6cb100SChristian Schoenebeck } 18738d6cb100SChristian Schoenebeck }); 18748d6cb100SChristian Schoenebeck /* 18758d6cb100SChristian Schoenebeck * Handle all the rest of this Twalk request on main thread ... 18768d6cb100SChristian Schoenebeck */ 187760ce86c7SWei Liu if (err < 0) { 187860ce86c7SWei Liu goto out; 187960ce86c7SWei Liu } 188056f101ecSGreg Kurz 18818d6cb100SChristian Schoenebeck err = stat_to_qid(pdu, &fidst, &qid); 188260ce86c7SWei Liu if (err < 0) { 188360ce86c7SWei Liu goto out; 188460ce86c7SWei Liu } 18858d6cb100SChristian Schoenebeck stbuf = fidst; 18868d6cb100SChristian Schoenebeck 18878d6cb100SChristian Schoenebeck /* reset dpath and path */ 18888d6cb100SChristian Schoenebeck v9fs_path_copy(&dpath, &fidp->path); 18898d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &fidp->path); 18908d6cb100SChristian Schoenebeck 18918d6cb100SChristian Schoenebeck for (name_idx = 0; name_idx < nwnames; name_idx++) { 18928d6cb100SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18938d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18948d6cb100SChristian Schoenebeck { 18958d6cb100SChristian Schoenebeck stbuf = stbufs[name_idx]; 18963b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18973b5ee9e8SAntonios Motakis if (err < 0) { 18983b5ee9e8SAntonios Motakis goto out; 18993b5ee9e8SAntonios Motakis } 19008d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &pathes[name_idx]); 190160ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 190260ce86c7SWei Liu } 190356f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 190456f101ecSGreg Kurz } 190560ce86c7SWei Liu if (fid == newfid) { 190649dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 190749dd946bSGreg Kurz err = -EINVAL; 190849dd946bSGreg Kurz goto out; 190949dd946bSGreg Kurz } 19105b3c77aaSGreg Kurz v9fs_path_write_lock(s); 191160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 19125b3c77aaSGreg Kurz v9fs_path_unlock(s); 191360ce86c7SWei Liu } else { 191460ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 191560ce86c7SWei Liu if (newfidp == NULL) { 191660ce86c7SWei Liu err = -EINVAL; 191760ce86c7SWei Liu goto out; 191860ce86c7SWei Liu } 191960ce86c7SWei Liu newfidp->uid = fidp->uid; 192060ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 192160ce86c7SWei Liu } 192260ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 192360ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 192460ce86c7SWei Liu out: 192560ce86c7SWei Liu put_fid(pdu, fidp); 192660ce86c7SWei Liu if (newfidp) { 192760ce86c7SWei Liu put_fid(pdu, newfidp); 192860ce86c7SWei Liu } 192960ce86c7SWei Liu v9fs_path_free(&dpath); 193060ce86c7SWei Liu v9fs_path_free(&path); 193160ce86c7SWei Liu out_nofid: 193260ce86c7SWei Liu pdu_complete(pdu, err); 193360ce86c7SWei Liu } 193460ce86c7SWei Liu 19358440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 193660ce86c7SWei Liu { 193760ce86c7SWei Liu struct statfs stbuf; 1938b565bccbSChristian Schoenebeck int err = v9fs_co_statfs(pdu, path, &stbuf); 193960ce86c7SWei Liu 1940b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, (err >= 0) ? stbuf.f_bsize : 0); 194160ce86c7SWei Liu } 194260ce86c7SWei Liu 19438440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 194460ce86c7SWei Liu { 194560ce86c7SWei Liu int flags; 194660ce86c7SWei Liu int32_t fid; 194760ce86c7SWei Liu int32_t mode; 194860ce86c7SWei Liu V9fsQID qid; 194960ce86c7SWei Liu int iounit = 0; 195060ce86c7SWei Liu ssize_t err = 0; 195160ce86c7SWei Liu size_t offset = 7; 195260ce86c7SWei Liu struct stat stbuf; 195360ce86c7SWei Liu V9fsFidState *fidp; 195460ce86c7SWei Liu V9fsPDU *pdu = opaque; 195560ce86c7SWei Liu V9fsState *s = pdu->s; 195660ce86c7SWei Liu 195760ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 195860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 195960ce86c7SWei Liu } else { 196060ce86c7SWei Liu uint8_t modebyte; 196160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 196260ce86c7SWei Liu mode = modebyte; 196360ce86c7SWei Liu } 196460ce86c7SWei Liu if (err < 0) { 196560ce86c7SWei Liu goto out_nofid; 196660ce86c7SWei Liu } 196760ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 196860ce86c7SWei Liu 196960ce86c7SWei Liu fidp = get_fid(pdu, fid); 197060ce86c7SWei Liu if (fidp == NULL) { 197160ce86c7SWei Liu err = -ENOENT; 197260ce86c7SWei Liu goto out_nofid; 197360ce86c7SWei Liu } 197449dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 197549dd946bSGreg Kurz err = -EINVAL; 197649dd946bSGreg Kurz goto out; 197749dd946bSGreg Kurz } 197860ce86c7SWei Liu 197960ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 198060ce86c7SWei Liu if (err < 0) { 198160ce86c7SWei Liu goto out; 198260ce86c7SWei Liu } 19833b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19843b5ee9e8SAntonios Motakis if (err < 0) { 19853b5ee9e8SAntonios Motakis goto out; 19863b5ee9e8SAntonios Motakis } 198760ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 198860ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 198960ce86c7SWei Liu if (err < 0) { 199060ce86c7SWei Liu goto out; 199160ce86c7SWei Liu } 199260ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 199360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 199460ce86c7SWei Liu if (err < 0) { 199560ce86c7SWei Liu goto out; 199660ce86c7SWei Liu } 199760ce86c7SWei Liu err += offset; 199860ce86c7SWei Liu } else { 199960ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 200060ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 200160ce86c7SWei Liu } else { 200260ce86c7SWei Liu flags = omode_to_uflags(mode); 200360ce86c7SWei Liu } 200460ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 200560ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 200660ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 200760ce86c7SWei Liu err = -EROFS; 200860ce86c7SWei Liu goto out; 200960ce86c7SWei Liu } 201060ce86c7SWei Liu } 201160ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 201260ce86c7SWei Liu if (err < 0) { 201360ce86c7SWei Liu goto out; 201460ce86c7SWei Liu } 201560ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 201660ce86c7SWei Liu fidp->open_flags = flags; 201760ce86c7SWei Liu if (flags & O_EXCL) { 201860ce86c7SWei Liu /* 201960ce86c7SWei Liu * We let the host file system do O_EXCL check 202060ce86c7SWei Liu * We should not reclaim such fd 202160ce86c7SWei Liu */ 202260ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 202360ce86c7SWei Liu } 202460ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 202560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 202660ce86c7SWei Liu if (err < 0) { 202760ce86c7SWei Liu goto out; 202860ce86c7SWei Liu } 202960ce86c7SWei Liu err += offset; 203060ce86c7SWei Liu } 203160ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 203260ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 203360ce86c7SWei Liu out: 203460ce86c7SWei Liu put_fid(pdu, fidp); 203560ce86c7SWei Liu out_nofid: 203660ce86c7SWei Liu pdu_complete(pdu, err); 203760ce86c7SWei Liu } 203860ce86c7SWei Liu 20398440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 204060ce86c7SWei Liu { 204160ce86c7SWei Liu int32_t dfid, flags, mode; 204260ce86c7SWei Liu gid_t gid; 204360ce86c7SWei Liu ssize_t err = 0; 204460ce86c7SWei Liu ssize_t offset = 7; 204560ce86c7SWei Liu V9fsString name; 204660ce86c7SWei Liu V9fsFidState *fidp; 204760ce86c7SWei Liu struct stat stbuf; 204860ce86c7SWei Liu V9fsQID qid; 204960ce86c7SWei Liu int32_t iounit; 205060ce86c7SWei Liu V9fsPDU *pdu = opaque; 205160ce86c7SWei Liu 205260ce86c7SWei Liu v9fs_string_init(&name); 205360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 205460ce86c7SWei Liu &name, &flags, &mode, &gid); 205560ce86c7SWei Liu if (err < 0) { 205660ce86c7SWei Liu goto out_nofid; 205760ce86c7SWei Liu } 205860ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 205960ce86c7SWei Liu 2060fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2061fff39a7aSGreg Kurz err = -ENOENT; 2062fff39a7aSGreg Kurz goto out_nofid; 2063fff39a7aSGreg Kurz } 2064fff39a7aSGreg Kurz 2065805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2066805b5d98SGreg Kurz err = -EEXIST; 2067805b5d98SGreg Kurz goto out_nofid; 2068805b5d98SGreg Kurz } 2069805b5d98SGreg Kurz 207060ce86c7SWei Liu fidp = get_fid(pdu, dfid); 207160ce86c7SWei Liu if (fidp == NULL) { 207260ce86c7SWei Liu err = -ENOENT; 207360ce86c7SWei Liu goto out_nofid; 207460ce86c7SWei Liu } 2075d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2076d63fb193SLi Qiang err = -EINVAL; 2077d63fb193SLi Qiang goto out; 2078d63fb193SLi Qiang } 207960ce86c7SWei Liu 208060ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 208160ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 208260ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 208360ce86c7SWei Liu if (err < 0) { 208460ce86c7SWei Liu goto out; 208560ce86c7SWei Liu } 208660ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 208760ce86c7SWei Liu fidp->open_flags = flags; 208860ce86c7SWei Liu if (flags & O_EXCL) { 208960ce86c7SWei Liu /* 209060ce86c7SWei Liu * We let the host file system do O_EXCL check 209160ce86c7SWei Liu * We should not reclaim such fd 209260ce86c7SWei Liu */ 209360ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 209460ce86c7SWei Liu } 209560ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20963b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20973b5ee9e8SAntonios Motakis if (err < 0) { 20983b5ee9e8SAntonios Motakis goto out; 20993b5ee9e8SAntonios Motakis } 210060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 210160ce86c7SWei Liu if (err < 0) { 210260ce86c7SWei Liu goto out; 210360ce86c7SWei Liu } 210460ce86c7SWei Liu err += offset; 210560ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 210660ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 210760ce86c7SWei Liu out: 210860ce86c7SWei Liu put_fid(pdu, fidp); 210960ce86c7SWei Liu out_nofid: 211060ce86c7SWei Liu pdu_complete(pdu, err); 211160ce86c7SWei Liu v9fs_string_free(&name); 211260ce86c7SWei Liu } 211360ce86c7SWei Liu 2114a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 211560ce86c7SWei Liu { 211660ce86c7SWei Liu int err; 211760ce86c7SWei Liu int32_t fid; 211860ce86c7SWei Liu int datasync; 211960ce86c7SWei Liu size_t offset = 7; 212060ce86c7SWei Liu V9fsFidState *fidp; 212160ce86c7SWei Liu V9fsPDU *pdu = opaque; 212260ce86c7SWei Liu 212360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 212460ce86c7SWei Liu if (err < 0) { 212560ce86c7SWei Liu goto out_nofid; 212660ce86c7SWei Liu } 212760ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 212860ce86c7SWei Liu 212960ce86c7SWei Liu fidp = get_fid(pdu, fid); 213060ce86c7SWei Liu if (fidp == NULL) { 213160ce86c7SWei Liu err = -ENOENT; 213260ce86c7SWei Liu goto out_nofid; 213360ce86c7SWei Liu } 213460ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 213560ce86c7SWei Liu if (!err) { 213660ce86c7SWei Liu err = offset; 213760ce86c7SWei Liu } 213860ce86c7SWei Liu put_fid(pdu, fidp); 213960ce86c7SWei Liu out_nofid: 214060ce86c7SWei Liu pdu_complete(pdu, err); 214160ce86c7SWei Liu } 214260ce86c7SWei Liu 21438440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 214460ce86c7SWei Liu { 214560ce86c7SWei Liu int err; 214660ce86c7SWei Liu int32_t fid; 214760ce86c7SWei Liu size_t offset = 7; 214860ce86c7SWei Liu V9fsFidState *fidp; 214960ce86c7SWei Liu V9fsPDU *pdu = opaque; 215060ce86c7SWei Liu V9fsState *s = pdu->s; 215160ce86c7SWei Liu 215260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 215360ce86c7SWei Liu if (err < 0) { 215460ce86c7SWei Liu goto out_nofid; 215560ce86c7SWei Liu } 215660ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 215760ce86c7SWei Liu 215860ce86c7SWei Liu fidp = clunk_fid(s, fid); 215960ce86c7SWei Liu if (fidp == NULL) { 216060ce86c7SWei Liu err = -ENOENT; 216160ce86c7SWei Liu goto out_nofid; 216260ce86c7SWei Liu } 216360ce86c7SWei Liu /* 216460ce86c7SWei Liu * Bump the ref so that put_fid will 216560ce86c7SWei Liu * free the fid. 216660ce86c7SWei Liu */ 216760ce86c7SWei Liu fidp->ref++; 216860ce86c7SWei Liu err = put_fid(pdu, fidp); 216960ce86c7SWei Liu if (!err) { 217060ce86c7SWei Liu err = offset; 217160ce86c7SWei Liu } 217260ce86c7SWei Liu out_nofid: 217360ce86c7SWei Liu pdu_complete(pdu, err); 217460ce86c7SWei Liu } 217560ce86c7SWei Liu 2176bcb8998fSStefano Stabellini /* 2177bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2178bcb8998fSStefano Stabellini * 2179bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2180bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2181bcb8998fSStefano Stabellini * @size: number of bytes to include 2182bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2183bcb8998fSStefano Stabellini * 2184bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2185bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2186bcb8998fSStefano Stabellini */ 2187bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2188cf45183bSStefano Stabellini size_t skip, size_t size, 2189bcb8998fSStefano Stabellini bool is_write) 2190bcb8998fSStefano Stabellini { 2191bcb8998fSStefano Stabellini QEMUIOVector elem; 2192bcb8998fSStefano Stabellini struct iovec *iov; 2193bcb8998fSStefano Stabellini unsigned int niov; 2194bcb8998fSStefano Stabellini 219588da0b03SStefano Stabellini if (is_write) { 2196cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 219788da0b03SStefano Stabellini } else { 2198cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 219988da0b03SStefano Stabellini } 2200bcb8998fSStefano Stabellini 2201bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2202bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2203cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2204bcb8998fSStefano Stabellini } 2205bcb8998fSStefano Stabellini 220660ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 220760ce86c7SWei Liu uint64_t off, uint32_t max_count) 220860ce86c7SWei Liu { 220960ce86c7SWei Liu ssize_t err; 221060ce86c7SWei Liu size_t offset = 7; 2211cf45183bSStefano Stabellini uint64_t read_count; 2212bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 221360ce86c7SWei Liu 22147e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 22157e55d65cSLi Qiang read_count = 0; 221616724a17SGreg Kurz } else { 2217cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2218cf45183bSStefano Stabellini } 2219cf45183bSStefano Stabellini if (read_count > max_count) { 222060ce86c7SWei Liu read_count = max_count; 222160ce86c7SWei Liu } 222260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 222360ce86c7SWei Liu if (err < 0) { 222460ce86c7SWei Liu return err; 222560ce86c7SWei Liu } 222660ce86c7SWei Liu offset += err; 222700588a0aSWei Liu 2228cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2229fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 223060ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 223160ce86c7SWei Liu read_count); 2232bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 223360ce86c7SWei Liu if (err < 0) { 223460ce86c7SWei Liu return err; 223560ce86c7SWei Liu } 223660ce86c7SWei Liu offset += err; 223760ce86c7SWei Liu return offset; 223860ce86c7SWei Liu } 223960ce86c7SWei Liu 22408440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 22418440e22eSGreg Kurz V9fsFidState *fidp, 22428440e22eSGreg Kurz uint32_t max_count) 224360ce86c7SWei Liu { 224460ce86c7SWei Liu V9fsPath path; 224560ce86c7SWei Liu V9fsStat v9stat; 224660ce86c7SWei Liu int len, err = 0; 224760ce86c7SWei Liu int32_t count = 0; 224860ce86c7SWei Liu struct stat stbuf; 224960ce86c7SWei Liu off_t saved_dir_pos; 2250635324e8SGreg Kurz struct dirent *dent; 225160ce86c7SWei Liu 225260ce86c7SWei Liu /* save the directory position */ 225360ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 225460ce86c7SWei Liu if (saved_dir_pos < 0) { 225560ce86c7SWei Liu return saved_dir_pos; 225660ce86c7SWei Liu } 225760ce86c7SWei Liu 225860ce86c7SWei Liu while (1) { 225960ce86c7SWei Liu v9fs_path_init(&path); 22607cde47d4SGreg Kurz 22617cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 22627cde47d4SGreg Kurz 2263635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2264635324e8SGreg Kurz if (err || !dent) { 226560ce86c7SWei Liu break; 226660ce86c7SWei Liu } 226760ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 226860ce86c7SWei Liu if (err < 0) { 22698762a46dSGreg Kurz break; 227060ce86c7SWei Liu } 227160ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 227260ce86c7SWei Liu if (err < 0) { 22738762a46dSGreg Kurz break; 227460ce86c7SWei Liu } 22756069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 227660ce86c7SWei Liu if (err < 0) { 22778762a46dSGreg Kurz break; 227860ce86c7SWei Liu } 2279772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 22807cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22817cde47d4SGreg Kurz 228260ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 228360ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 228460ce86c7SWei Liu v9fs_stat_free(&v9stat); 228560ce86c7SWei Liu v9fs_path_free(&path); 228660ce86c7SWei Liu return count; 228760ce86c7SWei Liu } 2288772a7369SJan Dakinevich 2289772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2290772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2291772a7369SJan Dakinevich 2292772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2293772a7369SJan Dakinevich 2294772a7369SJan Dakinevich if (len < 0) { 2295772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2296772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2297772a7369SJan Dakinevich v9fs_path_free(&path); 2298772a7369SJan Dakinevich return len; 2299772a7369SJan Dakinevich } 230060ce86c7SWei Liu count += len; 230160ce86c7SWei Liu v9fs_stat_free(&v9stat); 230260ce86c7SWei Liu v9fs_path_free(&path); 23036b3b279bSKeno Fischer saved_dir_pos = qemu_dirent_off(dent); 230460ce86c7SWei Liu } 23058762a46dSGreg Kurz 23067cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 23077cde47d4SGreg Kurz 230860ce86c7SWei Liu v9fs_path_free(&path); 230960ce86c7SWei Liu if (err < 0) { 231060ce86c7SWei Liu return err; 231160ce86c7SWei Liu } 231260ce86c7SWei Liu return count; 231360ce86c7SWei Liu } 231460ce86c7SWei Liu 23158440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 231660ce86c7SWei Liu { 231760ce86c7SWei Liu int32_t fid; 231860ce86c7SWei Liu uint64_t off; 231960ce86c7SWei Liu ssize_t err = 0; 232060ce86c7SWei Liu int32_t count = 0; 232160ce86c7SWei Liu size_t offset = 7; 232260ce86c7SWei Liu uint32_t max_count; 232360ce86c7SWei Liu V9fsFidState *fidp; 232460ce86c7SWei Liu V9fsPDU *pdu = opaque; 232560ce86c7SWei Liu V9fsState *s = pdu->s; 232660ce86c7SWei Liu 232760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 232860ce86c7SWei Liu if (err < 0) { 232960ce86c7SWei Liu goto out_nofid; 233060ce86c7SWei Liu } 233160ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 233260ce86c7SWei Liu 233360ce86c7SWei Liu fidp = get_fid(pdu, fid); 233460ce86c7SWei Liu if (fidp == NULL) { 233560ce86c7SWei Liu err = -EINVAL; 233660ce86c7SWei Liu goto out_nofid; 233760ce86c7SWei Liu } 233860ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2339d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2340d2c5cf7cSChristian Schoenebeck warn_report_once( 2341d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2342d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2343d2c5cf7cSChristian Schoenebeck ); 2344d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2345d2c5cf7cSChristian Schoenebeck goto out; 2346d2c5cf7cSChristian Schoenebeck } 234760ce86c7SWei Liu if (off == 0) { 234860ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 234960ce86c7SWei Liu } 235060ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 235160ce86c7SWei Liu if (count < 0) { 235260ce86c7SWei Liu err = count; 235360ce86c7SWei Liu goto out; 235460ce86c7SWei Liu } 235560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 235660ce86c7SWei Liu if (err < 0) { 235760ce86c7SWei Liu goto out; 235860ce86c7SWei Liu } 235960ce86c7SWei Liu err += offset + count; 236060ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 236160ce86c7SWei Liu QEMUIOVector qiov_full; 236260ce86c7SWei Liu QEMUIOVector qiov; 236360ce86c7SWei Liu int32_t len; 236460ce86c7SWei Liu 2365cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 236660ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 236760ce86c7SWei Liu do { 236860ce86c7SWei Liu qemu_iovec_reset(&qiov); 236960ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 237060ce86c7SWei Liu if (0) { 237160ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 237260ce86c7SWei Liu } 237360ce86c7SWei Liu /* Loop in case of EINTR */ 237460ce86c7SWei Liu do { 237560ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 237660ce86c7SWei Liu if (len >= 0) { 237760ce86c7SWei Liu off += len; 237860ce86c7SWei Liu count += len; 237960ce86c7SWei Liu } 238060ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 238160ce86c7SWei Liu if (len < 0) { 238260ce86c7SWei Liu /* IO error return the error */ 238360ce86c7SWei Liu err = len; 2384e95c9a49SLi Qiang goto out_free_iovec; 238560ce86c7SWei Liu } 238660ce86c7SWei Liu } while (count < max_count && len > 0); 238760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 238860ce86c7SWei Liu if (err < 0) { 2389e95c9a49SLi Qiang goto out_free_iovec; 239060ce86c7SWei Liu } 239160ce86c7SWei Liu err += offset + count; 2392e95c9a49SLi Qiang out_free_iovec: 239360ce86c7SWei Liu qemu_iovec_destroy(&qiov); 239460ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 239560ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 239660ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 239760ce86c7SWei Liu } else { 239860ce86c7SWei Liu err = -EINVAL; 239960ce86c7SWei Liu } 240060ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 240160ce86c7SWei Liu out: 240260ce86c7SWei Liu put_fid(pdu, fidp); 240360ce86c7SWei Liu out_nofid: 240460ce86c7SWei Liu pdu_complete(pdu, err); 240560ce86c7SWei Liu } 240660ce86c7SWei Liu 240729c9d2caSChristian Schoenebeck /** 2408e16fea41SChristian Schoenebeck * v9fs_readdir_response_size() - Returns size required in Rreaddir response 2409e16fea41SChristian Schoenebeck * for the passed dirent @name. 241029c9d2caSChristian Schoenebeck * 2411e16fea41SChristian Schoenebeck * @name: directory entry's name (i.e. file name, directory name) 2412e16fea41SChristian Schoenebeck * Return: required size in bytes 241329c9d2caSChristian Schoenebeck */ 241429c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 241560ce86c7SWei Liu { 241660ce86c7SWei Liu /* 241760ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 241860ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 241960ce86c7SWei Liu */ 242060ce86c7SWei Liu return 24 + v9fs_string_size(name); 242160ce86c7SWei Liu } 242260ce86c7SWei Liu 24230c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 24240c4356baSChristian Schoenebeck { 24250c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 24260c4356baSChristian Schoenebeck 24270c4356baSChristian Schoenebeck for (; e; e = next) { 24280c4356baSChristian Schoenebeck next = e->next; 24290c4356baSChristian Schoenebeck g_free(e->dent); 24300c4356baSChristian Schoenebeck g_free(e->st); 24310c4356baSChristian Schoenebeck g_free(e); 24320c4356baSChristian Schoenebeck } 24330c4356baSChristian Schoenebeck } 24340c4356baSChristian Schoenebeck 24358440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 24360c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 243760ce86c7SWei Liu { 243860ce86c7SWei Liu size_t size; 243960ce86c7SWei Liu V9fsQID qid; 244060ce86c7SWei Liu V9fsString name; 244160ce86c7SWei Liu int len, err = 0; 244260ce86c7SWei Liu int32_t count = 0; 24436b3b279bSKeno Fischer off_t off; 2444635324e8SGreg Kurz struct dirent *dent; 24450c4356baSChristian Schoenebeck struct stat *st; 24460c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 244760ce86c7SWei Liu 24480c4356baSChristian Schoenebeck /* 24490c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 24500c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 24510c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 24520c4356baSChristian Schoenebeck */ 24530c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 24540c4356baSChristian Schoenebeck 24550c4356baSChristian Schoenebeck /* 24560c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 24570c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 24580c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 24590c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 24600c4356baSChristian Schoenebeck */ 24610c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 24620c4356baSChristian Schoenebeck dostat); 24630c4356baSChristian Schoenebeck if (count < 0) { 24640c4356baSChristian Schoenebeck err = count; 24650c4356baSChristian Schoenebeck count = 0; 24660c4356baSChristian Schoenebeck goto out; 246760ce86c7SWei Liu } 24680c4356baSChristian Schoenebeck count = 0; 246960ce86c7SWei Liu 24700c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 24710c4356baSChristian Schoenebeck dent = e->dent; 24721a6ed33cSAntonios Motakis 24731a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 24740c4356baSChristian Schoenebeck st = e->st; 24750c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 24760c4356baSChristian Schoenebeck if (!st) { 24770c4356baSChristian Schoenebeck err = -1; 24780c4356baSChristian Schoenebeck break; 24790c4356baSChristian Schoenebeck } 24800c4356baSChristian Schoenebeck 24810c4356baSChristian Schoenebeck /* remap inode */ 24820c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 24831a6ed33cSAntonios Motakis if (err < 0) { 24840c4356baSChristian Schoenebeck break; 24851a6ed33cSAntonios Motakis } 24861a6ed33cSAntonios Motakis } else { 248760ce86c7SWei Liu /* 248860ce86c7SWei Liu * Fill up just the path field of qid because the client uses 248960ce86c7SWei Liu * only that. To fill the entire qid structure we will have 24901a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 24910c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 24921a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 24931a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 24941a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 24951a6ed33cSAntonios Motakis * files/dirs through other ways. 249660ce86c7SWei Liu */ 249760ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 249860ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 249960ce86c7SWei Liu /* Fill the other fields with dummy values */ 250060ce86c7SWei Liu qid.type = 0; 250160ce86c7SWei Liu qid.version = 0; 25021a6ed33cSAntonios Motakis } 250360ce86c7SWei Liu 25046b3b279bSKeno Fischer off = qemu_dirent_off(dent); 25050c4356baSChristian Schoenebeck v9fs_string_init(&name); 25060c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 25070c4356baSChristian Schoenebeck 250860ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 250960ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 25106b3b279bSKeno Fischer &qid, off, 251160ce86c7SWei Liu dent->d_type, &name); 25127cde47d4SGreg Kurz 25130c4356baSChristian Schoenebeck v9fs_string_free(&name); 25147cde47d4SGreg Kurz 251560ce86c7SWei Liu if (len < 0) { 25160c4356baSChristian Schoenebeck err = len; 25170c4356baSChristian Schoenebeck break; 251860ce86c7SWei Liu } 25190c4356baSChristian Schoenebeck 252060ce86c7SWei Liu count += len; 252160ce86c7SWei Liu } 25227cde47d4SGreg Kurz 25230c4356baSChristian Schoenebeck out: 25240c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 252560ce86c7SWei Liu if (err < 0) { 252660ce86c7SWei Liu return err; 252760ce86c7SWei Liu } 252860ce86c7SWei Liu return count; 252960ce86c7SWei Liu } 253060ce86c7SWei Liu 25318440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 253260ce86c7SWei Liu { 253360ce86c7SWei Liu int32_t fid; 253460ce86c7SWei Liu V9fsFidState *fidp; 253560ce86c7SWei Liu ssize_t retval = 0; 253660ce86c7SWei Liu size_t offset = 7; 253760ce86c7SWei Liu uint64_t initial_offset; 253860ce86c7SWei Liu int32_t count; 253960ce86c7SWei Liu uint32_t max_count; 254060ce86c7SWei Liu V9fsPDU *pdu = opaque; 2541d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 254260ce86c7SWei Liu 254360ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 254460ce86c7SWei Liu &initial_offset, &max_count); 254560ce86c7SWei Liu if (retval < 0) { 254660ce86c7SWei Liu goto out_nofid; 254760ce86c7SWei Liu } 254860ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 254960ce86c7SWei Liu 2550d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2551d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2552d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2553d36a5c22SChristian Schoenebeck warn_report_once( 2554d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2555d36a5c22SChristian Schoenebeck ); 2556d36a5c22SChristian Schoenebeck } 2557d36a5c22SChristian Schoenebeck 255860ce86c7SWei Liu fidp = get_fid(pdu, fid); 255960ce86c7SWei Liu if (fidp == NULL) { 256060ce86c7SWei Liu retval = -EINVAL; 256160ce86c7SWei Liu goto out_nofid; 256260ce86c7SWei Liu } 2563f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 256460ce86c7SWei Liu retval = -EINVAL; 256560ce86c7SWei Liu goto out; 256660ce86c7SWei Liu } 2567d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2568d2c5cf7cSChristian Schoenebeck warn_report_once( 2569d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2570d2c5cf7cSChristian Schoenebeck "protocol version" 2571d2c5cf7cSChristian Schoenebeck ); 2572d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2573d2c5cf7cSChristian Schoenebeck goto out; 2574d2c5cf7cSChristian Schoenebeck } 25750c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 257660ce86c7SWei Liu if (count < 0) { 257760ce86c7SWei Liu retval = count; 257860ce86c7SWei Liu goto out; 257960ce86c7SWei Liu } 258060ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 258160ce86c7SWei Liu if (retval < 0) { 258260ce86c7SWei Liu goto out; 258360ce86c7SWei Liu } 258460ce86c7SWei Liu retval += count + offset; 258560ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 258660ce86c7SWei Liu out: 258760ce86c7SWei Liu put_fid(pdu, fidp); 258860ce86c7SWei Liu out_nofid: 258960ce86c7SWei Liu pdu_complete(pdu, retval); 259060ce86c7SWei Liu } 259160ce86c7SWei Liu 259260ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 259360ce86c7SWei Liu uint64_t off, uint32_t count, 259460ce86c7SWei Liu struct iovec *sg, int cnt) 259560ce86c7SWei Liu { 259660ce86c7SWei Liu int i, to_copy; 259760ce86c7SWei Liu ssize_t err = 0; 25987e55d65cSLi Qiang uint64_t write_count; 259960ce86c7SWei Liu size_t offset = 7; 260060ce86c7SWei Liu 260160ce86c7SWei Liu 26027e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2603b858e80aSDaniel Henrique Barboza return -ENOSPC; 260460ce86c7SWei Liu } 26057e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 26067e55d65cSLi Qiang if (write_count > count) { 26077e55d65cSLi Qiang write_count = count; 26087e55d65cSLi Qiang } 260960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 261060ce86c7SWei Liu if (err < 0) { 261160ce86c7SWei Liu return err; 261260ce86c7SWei Liu } 261360ce86c7SWei Liu err += offset; 261460ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 261560ce86c7SWei Liu /* 261660ce86c7SWei Liu * Now copy the content from sg list 261760ce86c7SWei Liu */ 261860ce86c7SWei Liu for (i = 0; i < cnt; i++) { 261960ce86c7SWei Liu if (write_count > sg[i].iov_len) { 262060ce86c7SWei Liu to_copy = sg[i].iov_len; 262160ce86c7SWei Liu } else { 262260ce86c7SWei Liu to_copy = write_count; 262360ce86c7SWei Liu } 262460ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 262560ce86c7SWei Liu /* updating vs->off since we are not using below */ 262660ce86c7SWei Liu off += to_copy; 262760ce86c7SWei Liu write_count -= to_copy; 262860ce86c7SWei Liu } 2629b858e80aSDaniel Henrique Barboza 263060ce86c7SWei Liu return err; 263160ce86c7SWei Liu } 263260ce86c7SWei Liu 26338440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 263460ce86c7SWei Liu { 263560ce86c7SWei Liu ssize_t err; 263660ce86c7SWei Liu int32_t fid; 263760ce86c7SWei Liu uint64_t off; 263860ce86c7SWei Liu uint32_t count; 263960ce86c7SWei Liu int32_t len = 0; 264060ce86c7SWei Liu int32_t total = 0; 264160ce86c7SWei Liu size_t offset = 7; 264260ce86c7SWei Liu V9fsFidState *fidp; 264360ce86c7SWei Liu V9fsPDU *pdu = opaque; 264460ce86c7SWei Liu V9fsState *s = pdu->s; 264560ce86c7SWei Liu QEMUIOVector qiov_full; 264660ce86c7SWei Liu QEMUIOVector qiov; 264760ce86c7SWei Liu 264860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 264960ce86c7SWei Liu if (err < 0) { 265060ce86c7SWei Liu pdu_complete(pdu, err); 265160ce86c7SWei Liu return; 265260ce86c7SWei Liu } 265360ce86c7SWei Liu offset += err; 2654cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 265560ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 265660ce86c7SWei Liu 265760ce86c7SWei Liu fidp = get_fid(pdu, fid); 265860ce86c7SWei Liu if (fidp == NULL) { 265960ce86c7SWei Liu err = -EINVAL; 266060ce86c7SWei Liu goto out_nofid; 266160ce86c7SWei Liu } 266260ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 266360ce86c7SWei Liu if (fidp->fs.fd == -1) { 266460ce86c7SWei Liu err = -EINVAL; 266560ce86c7SWei Liu goto out; 266660ce86c7SWei Liu } 266760ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 266860ce86c7SWei Liu /* 266960ce86c7SWei Liu * setxattr operation 267060ce86c7SWei Liu */ 267160ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 267260ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 267360ce86c7SWei Liu goto out; 267460ce86c7SWei Liu } else { 267560ce86c7SWei Liu err = -EINVAL; 267660ce86c7SWei Liu goto out; 267760ce86c7SWei Liu } 267860ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 267960ce86c7SWei Liu do { 268060ce86c7SWei Liu qemu_iovec_reset(&qiov); 268160ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 268260ce86c7SWei Liu if (0) { 268360ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 268460ce86c7SWei Liu } 268560ce86c7SWei Liu /* Loop in case of EINTR */ 268660ce86c7SWei Liu do { 268760ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 268860ce86c7SWei Liu if (len >= 0) { 268960ce86c7SWei Liu off += len; 269060ce86c7SWei Liu total += len; 269160ce86c7SWei Liu } 269260ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 269360ce86c7SWei Liu if (len < 0) { 269460ce86c7SWei Liu /* IO error return the error */ 269560ce86c7SWei Liu err = len; 269660ce86c7SWei Liu goto out_qiov; 269760ce86c7SWei Liu } 269860ce86c7SWei Liu } while (total < count && len > 0); 269960ce86c7SWei Liu 270060ce86c7SWei Liu offset = 7; 270160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 270260ce86c7SWei Liu if (err < 0) { 2703fdfcc9aeSLi Qiang goto out_qiov; 270460ce86c7SWei Liu } 270560ce86c7SWei Liu err += offset; 270660ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 270760ce86c7SWei Liu out_qiov: 270860ce86c7SWei Liu qemu_iovec_destroy(&qiov); 270960ce86c7SWei Liu out: 271060ce86c7SWei Liu put_fid(pdu, fidp); 271160ce86c7SWei Liu out_nofid: 271260ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 271360ce86c7SWei Liu pdu_complete(pdu, err); 271460ce86c7SWei Liu } 271560ce86c7SWei Liu 27168440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 271760ce86c7SWei Liu { 271860ce86c7SWei Liu int32_t fid; 271960ce86c7SWei Liu int err = 0; 272060ce86c7SWei Liu size_t offset = 7; 272160ce86c7SWei Liu V9fsFidState *fidp; 272260ce86c7SWei Liu V9fsQID qid; 272360ce86c7SWei Liu int32_t perm; 272460ce86c7SWei Liu int8_t mode; 272560ce86c7SWei Liu V9fsPath path; 272660ce86c7SWei Liu struct stat stbuf; 272760ce86c7SWei Liu V9fsString name; 272860ce86c7SWei Liu V9fsString extension; 272960ce86c7SWei Liu int iounit; 273060ce86c7SWei Liu V9fsPDU *pdu = opaque; 27315b3c77aaSGreg Kurz V9fsState *s = pdu->s; 273260ce86c7SWei Liu 273360ce86c7SWei Liu v9fs_path_init(&path); 273460ce86c7SWei Liu v9fs_string_init(&name); 273560ce86c7SWei Liu v9fs_string_init(&extension); 273660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 273760ce86c7SWei Liu &perm, &mode, &extension); 273860ce86c7SWei Liu if (err < 0) { 273960ce86c7SWei Liu goto out_nofid; 274060ce86c7SWei Liu } 274160ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 274260ce86c7SWei Liu 2743fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2744fff39a7aSGreg Kurz err = -ENOENT; 2745fff39a7aSGreg Kurz goto out_nofid; 2746fff39a7aSGreg Kurz } 2747fff39a7aSGreg Kurz 2748805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2749805b5d98SGreg Kurz err = -EEXIST; 2750805b5d98SGreg Kurz goto out_nofid; 2751805b5d98SGreg Kurz } 2752805b5d98SGreg Kurz 275360ce86c7SWei Liu fidp = get_fid(pdu, fid); 275460ce86c7SWei Liu if (fidp == NULL) { 275560ce86c7SWei Liu err = -EINVAL; 275660ce86c7SWei Liu goto out_nofid; 275760ce86c7SWei Liu } 2758d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2759d63fb193SLi Qiang err = -EINVAL; 2760d63fb193SLi Qiang goto out; 2761d63fb193SLi Qiang } 276260ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 276360ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 276460ce86c7SWei Liu fidp->uid, -1, &stbuf); 276560ce86c7SWei Liu if (err < 0) { 276660ce86c7SWei Liu goto out; 276760ce86c7SWei Liu } 276860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 276960ce86c7SWei Liu if (err < 0) { 277060ce86c7SWei Liu goto out; 277160ce86c7SWei Liu } 27725b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27745b3c77aaSGreg Kurz v9fs_path_unlock(s); 277560ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 277660ce86c7SWei Liu if (err < 0) { 277760ce86c7SWei Liu goto out; 277860ce86c7SWei Liu } 277960ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 278060ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 278160ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 278260ce86c7SWei Liu extension.data, -1 , &stbuf); 278360ce86c7SWei Liu if (err < 0) { 278460ce86c7SWei Liu goto out; 278560ce86c7SWei Liu } 278660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 278760ce86c7SWei Liu if (err < 0) { 278860ce86c7SWei Liu goto out; 278960ce86c7SWei Liu } 27905b3c77aaSGreg Kurz v9fs_path_write_lock(s); 279160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27925b3c77aaSGreg Kurz v9fs_path_unlock(s); 279360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 279460ce86c7SWei Liu int32_t ofid = atoi(extension.data); 279560ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 279660ce86c7SWei Liu if (ofidp == NULL) { 279760ce86c7SWei Liu err = -EINVAL; 279860ce86c7SWei Liu goto out; 279960ce86c7SWei Liu } 280060ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 280160ce86c7SWei Liu put_fid(pdu, ofidp); 280260ce86c7SWei Liu if (err < 0) { 280360ce86c7SWei Liu goto out; 280460ce86c7SWei Liu } 280560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 280660ce86c7SWei Liu if (err < 0) { 280760ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 280860ce86c7SWei Liu goto out; 280960ce86c7SWei Liu } 28105b3c77aaSGreg Kurz v9fs_path_write_lock(s); 281160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28125b3c77aaSGreg Kurz v9fs_path_unlock(s); 281360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 281460ce86c7SWei Liu if (err < 0) { 281560ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 281660ce86c7SWei Liu goto out; 281760ce86c7SWei Liu } 281860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 281960ce86c7SWei Liu char ctype; 282060ce86c7SWei Liu uint32_t major, minor; 282160ce86c7SWei Liu mode_t nmode = 0; 282260ce86c7SWei Liu 282360ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 282460ce86c7SWei Liu err = -errno; 282560ce86c7SWei Liu goto out; 282660ce86c7SWei Liu } 282760ce86c7SWei Liu 282860ce86c7SWei Liu switch (ctype) { 282960ce86c7SWei Liu case 'c': 283060ce86c7SWei Liu nmode = S_IFCHR; 283160ce86c7SWei Liu break; 283260ce86c7SWei Liu case 'b': 283360ce86c7SWei Liu nmode = S_IFBLK; 283460ce86c7SWei Liu break; 283560ce86c7SWei Liu default: 283660ce86c7SWei Liu err = -EIO; 283760ce86c7SWei Liu goto out; 283860ce86c7SWei Liu } 283960ce86c7SWei Liu 284060ce86c7SWei Liu nmode |= perm & 0777; 284160ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 284260ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 284360ce86c7SWei Liu if (err < 0) { 284460ce86c7SWei Liu goto out; 284560ce86c7SWei Liu } 284660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 284760ce86c7SWei Liu if (err < 0) { 284860ce86c7SWei Liu goto out; 284960ce86c7SWei Liu } 28505b3c77aaSGreg Kurz v9fs_path_write_lock(s); 285160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28525b3c77aaSGreg Kurz v9fs_path_unlock(s); 285360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 285460ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 285560ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 285660ce86c7SWei Liu if (err < 0) { 285760ce86c7SWei Liu goto out; 285860ce86c7SWei Liu } 285960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 286060ce86c7SWei Liu if (err < 0) { 286160ce86c7SWei Liu goto out; 286260ce86c7SWei Liu } 28635b3c77aaSGreg Kurz v9fs_path_write_lock(s); 286460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28655b3c77aaSGreg Kurz v9fs_path_unlock(s); 286660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 286760ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 286860ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 286960ce86c7SWei Liu if (err < 0) { 287060ce86c7SWei Liu goto out; 287160ce86c7SWei Liu } 287260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 287360ce86c7SWei Liu if (err < 0) { 287460ce86c7SWei Liu goto out; 287560ce86c7SWei Liu } 28765b3c77aaSGreg Kurz v9fs_path_write_lock(s); 287760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28785b3c77aaSGreg Kurz v9fs_path_unlock(s); 287960ce86c7SWei Liu } else { 288060ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 288160ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 288260ce86c7SWei Liu if (err < 0) { 288360ce86c7SWei Liu goto out; 288460ce86c7SWei Liu } 288560ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 288660ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 288760ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 288860ce86c7SWei Liu /* 288960ce86c7SWei Liu * We let the host file system do O_EXCL check 289060ce86c7SWei Liu * We should not reclaim such fd 289160ce86c7SWei Liu */ 289260ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 289360ce86c7SWei Liu } 289460ce86c7SWei Liu } 289560ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 28963b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28973b5ee9e8SAntonios Motakis if (err < 0) { 28983b5ee9e8SAntonios Motakis goto out; 28993b5ee9e8SAntonios Motakis } 290060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 290160ce86c7SWei Liu if (err < 0) { 290260ce86c7SWei Liu goto out; 290360ce86c7SWei Liu } 290460ce86c7SWei Liu err += offset; 290560ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 290660ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 290760ce86c7SWei Liu out: 290860ce86c7SWei Liu put_fid(pdu, fidp); 290960ce86c7SWei Liu out_nofid: 291060ce86c7SWei Liu pdu_complete(pdu, err); 291160ce86c7SWei Liu v9fs_string_free(&name); 291260ce86c7SWei Liu v9fs_string_free(&extension); 291360ce86c7SWei Liu v9fs_path_free(&path); 291460ce86c7SWei Liu } 291560ce86c7SWei Liu 29168440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 291760ce86c7SWei Liu { 291860ce86c7SWei Liu V9fsPDU *pdu = opaque; 291960ce86c7SWei Liu V9fsString name; 292060ce86c7SWei Liu V9fsString symname; 292160ce86c7SWei Liu V9fsFidState *dfidp; 292260ce86c7SWei Liu V9fsQID qid; 292360ce86c7SWei Liu struct stat stbuf; 292460ce86c7SWei Liu int32_t dfid; 292560ce86c7SWei Liu int err = 0; 292660ce86c7SWei Liu gid_t gid; 292760ce86c7SWei Liu size_t offset = 7; 292860ce86c7SWei Liu 292960ce86c7SWei Liu v9fs_string_init(&name); 293060ce86c7SWei Liu v9fs_string_init(&symname); 293160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 293260ce86c7SWei Liu if (err < 0) { 293360ce86c7SWei Liu goto out_nofid; 293460ce86c7SWei Liu } 293560ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 293660ce86c7SWei Liu 2937fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2938fff39a7aSGreg Kurz err = -ENOENT; 2939fff39a7aSGreg Kurz goto out_nofid; 2940fff39a7aSGreg Kurz } 2941fff39a7aSGreg Kurz 2942805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2943805b5d98SGreg Kurz err = -EEXIST; 2944805b5d98SGreg Kurz goto out_nofid; 2945805b5d98SGreg Kurz } 2946805b5d98SGreg Kurz 294760ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 294860ce86c7SWei Liu if (dfidp == NULL) { 294960ce86c7SWei Liu err = -EINVAL; 295060ce86c7SWei Liu goto out_nofid; 295160ce86c7SWei Liu } 295260ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 295360ce86c7SWei Liu if (err < 0) { 295460ce86c7SWei Liu goto out; 295560ce86c7SWei Liu } 29563b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 29573b5ee9e8SAntonios Motakis if (err < 0) { 29583b5ee9e8SAntonios Motakis goto out; 29593b5ee9e8SAntonios Motakis } 296060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 296160ce86c7SWei Liu if (err < 0) { 296260ce86c7SWei Liu goto out; 296360ce86c7SWei Liu } 296460ce86c7SWei Liu err += offset; 296560ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 296660ce86c7SWei Liu qid.type, qid.version, qid.path); 296760ce86c7SWei Liu out: 296860ce86c7SWei Liu put_fid(pdu, dfidp); 296960ce86c7SWei Liu out_nofid: 297060ce86c7SWei Liu pdu_complete(pdu, err); 297160ce86c7SWei Liu v9fs_string_free(&name); 297260ce86c7SWei Liu v9fs_string_free(&symname); 297360ce86c7SWei Liu } 297460ce86c7SWei Liu 2975a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 297660ce86c7SWei Liu { 297760ce86c7SWei Liu ssize_t err; 297860ce86c7SWei Liu int16_t tag; 297960ce86c7SWei Liu size_t offset = 7; 2980d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 298160ce86c7SWei Liu V9fsPDU *pdu = opaque; 298260ce86c7SWei Liu V9fsState *s = pdu->s; 298360ce86c7SWei Liu 298460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 298560ce86c7SWei Liu if (err < 0) { 298660ce86c7SWei Liu pdu_complete(pdu, err); 298760ce86c7SWei Liu return; 298860ce86c7SWei Liu } 298960ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 299060ce86c7SWei Liu 2991d5f2af7bSGreg Kurz if (pdu->tag == tag) { 29923dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2993d5f2af7bSGreg Kurz } else { 299460ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 299560ce86c7SWei Liu if (cancel_pdu->tag == tag) { 299660ce86c7SWei Liu break; 299760ce86c7SWei Liu } 299860ce86c7SWei Liu } 2999d5f2af7bSGreg Kurz } 300060ce86c7SWei Liu if (cancel_pdu) { 300160ce86c7SWei Liu cancel_pdu->cancelled = 1; 300260ce86c7SWei Liu /* 300360ce86c7SWei Liu * Wait for pdu to complete. 300460ce86c7SWei Liu */ 30051ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 300618adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 300760ce86c7SWei Liu cancel_pdu->cancelled = 0; 300860ce86c7SWei Liu pdu_free(cancel_pdu); 300960ce86c7SWei Liu } 301018adde86SGreg Kurz } 301160ce86c7SWei Liu pdu_complete(pdu, 7); 301260ce86c7SWei Liu } 301360ce86c7SWei Liu 30148440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 301560ce86c7SWei Liu { 301660ce86c7SWei Liu V9fsPDU *pdu = opaque; 301760ce86c7SWei Liu int32_t dfid, oldfid; 301860ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 301960ce86c7SWei Liu V9fsString name; 302060ce86c7SWei Liu size_t offset = 7; 302160ce86c7SWei Liu int err = 0; 302260ce86c7SWei Liu 302360ce86c7SWei Liu v9fs_string_init(&name); 302460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 302560ce86c7SWei Liu if (err < 0) { 302660ce86c7SWei Liu goto out_nofid; 302760ce86c7SWei Liu } 302860ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 302960ce86c7SWei Liu 3030fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3031fff39a7aSGreg Kurz err = -ENOENT; 3032fff39a7aSGreg Kurz goto out_nofid; 3033fff39a7aSGreg Kurz } 3034fff39a7aSGreg Kurz 3035805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3036805b5d98SGreg Kurz err = -EEXIST; 3037805b5d98SGreg Kurz goto out_nofid; 3038805b5d98SGreg Kurz } 3039805b5d98SGreg Kurz 304060ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 304160ce86c7SWei Liu if (dfidp == NULL) { 304260ce86c7SWei Liu err = -ENOENT; 304360ce86c7SWei Liu goto out_nofid; 304460ce86c7SWei Liu } 304560ce86c7SWei Liu 304660ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 304760ce86c7SWei Liu if (oldfidp == NULL) { 304860ce86c7SWei Liu err = -ENOENT; 304960ce86c7SWei Liu goto out; 305060ce86c7SWei Liu } 305160ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 305260ce86c7SWei Liu if (!err) { 305360ce86c7SWei Liu err = offset; 305460ce86c7SWei Liu } 30554c158678SLi Qiang put_fid(pdu, oldfidp); 305660ce86c7SWei Liu out: 305760ce86c7SWei Liu put_fid(pdu, dfidp); 305860ce86c7SWei Liu out_nofid: 305960ce86c7SWei Liu v9fs_string_free(&name); 306060ce86c7SWei Liu pdu_complete(pdu, err); 306160ce86c7SWei Liu } 306260ce86c7SWei Liu 306360ce86c7SWei Liu /* Only works with path name based fid */ 30648440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 306560ce86c7SWei Liu { 306660ce86c7SWei Liu int32_t fid; 306760ce86c7SWei Liu int err = 0; 306860ce86c7SWei Liu size_t offset = 7; 306960ce86c7SWei Liu V9fsFidState *fidp; 307060ce86c7SWei Liu V9fsPDU *pdu = opaque; 307160ce86c7SWei Liu 307260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 307360ce86c7SWei Liu if (err < 0) { 307460ce86c7SWei Liu goto out_nofid; 307560ce86c7SWei Liu } 307660ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 307760ce86c7SWei Liu 307860ce86c7SWei Liu fidp = get_fid(pdu, fid); 307960ce86c7SWei Liu if (fidp == NULL) { 308060ce86c7SWei Liu err = -EINVAL; 308160ce86c7SWei Liu goto out_nofid; 308260ce86c7SWei Liu } 308360ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 308460ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 308560ce86c7SWei Liu err = -EOPNOTSUPP; 308660ce86c7SWei Liu goto out_err; 308760ce86c7SWei Liu } 308860ce86c7SWei Liu /* 308960ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 309060ce86c7SWei Liu * the file later. So don't reclaim fd 309160ce86c7SWei Liu */ 309260ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 309360ce86c7SWei Liu if (err < 0) { 309460ce86c7SWei Liu goto out_err; 309560ce86c7SWei Liu } 309660ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 309760ce86c7SWei Liu if (!err) { 309860ce86c7SWei Liu err = offset; 309960ce86c7SWei Liu } 310060ce86c7SWei Liu out_err: 310160ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 310260ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 310360ce86c7SWei Liu put_fid(pdu, fidp); 310460ce86c7SWei Liu out_nofid: 310560ce86c7SWei Liu pdu_complete(pdu, err); 310660ce86c7SWei Liu } 310760ce86c7SWei Liu 31088440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 310960ce86c7SWei Liu { 311060ce86c7SWei Liu int err = 0; 311160ce86c7SWei Liu V9fsString name; 311267e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 311360ce86c7SWei Liu size_t offset = 7; 311460ce86c7SWei Liu V9fsPath path; 311560ce86c7SWei Liu V9fsFidState *dfidp; 311660ce86c7SWei Liu V9fsPDU *pdu = opaque; 311760ce86c7SWei Liu 311860ce86c7SWei Liu v9fs_string_init(&name); 311960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 312060ce86c7SWei Liu if (err < 0) { 312160ce86c7SWei Liu goto out_nofid; 312260ce86c7SWei Liu } 3123fff39a7aSGreg Kurz 3124fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3125fff39a7aSGreg Kurz err = -ENOENT; 3126fff39a7aSGreg Kurz goto out_nofid; 3127fff39a7aSGreg Kurz } 3128fff39a7aSGreg Kurz 3129805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3130805b5d98SGreg Kurz err = -EINVAL; 3131805b5d98SGreg Kurz goto out_nofid; 3132805b5d98SGreg Kurz } 3133805b5d98SGreg Kurz 3134805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3135805b5d98SGreg Kurz err = -ENOTEMPTY; 3136805b5d98SGreg Kurz goto out_nofid; 3137805b5d98SGreg Kurz } 3138805b5d98SGreg Kurz 313967e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 314067e87345SKeno Fischer err = -EINVAL; 314167e87345SKeno Fischer goto out_nofid; 314267e87345SKeno Fischer } 314367e87345SKeno Fischer 314467e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 314567e87345SKeno Fischer rflags |= AT_REMOVEDIR; 314667e87345SKeno Fischer } 314767e87345SKeno Fischer 314860ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 314960ce86c7SWei Liu if (dfidp == NULL) { 315060ce86c7SWei Liu err = -EINVAL; 315160ce86c7SWei Liu goto out_nofid; 315260ce86c7SWei Liu } 315360ce86c7SWei Liu /* 315460ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 315560ce86c7SWei Liu * the file later. So don't reclaim fd 315660ce86c7SWei Liu */ 315760ce86c7SWei Liu v9fs_path_init(&path); 315860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 315960ce86c7SWei Liu if (err < 0) { 316060ce86c7SWei Liu goto out_err; 316160ce86c7SWei Liu } 316260ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 316360ce86c7SWei Liu if (err < 0) { 316460ce86c7SWei Liu goto out_err; 316560ce86c7SWei Liu } 316667e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 316760ce86c7SWei Liu if (!err) { 316860ce86c7SWei Liu err = offset; 316960ce86c7SWei Liu } 317060ce86c7SWei Liu out_err: 317160ce86c7SWei Liu put_fid(pdu, dfidp); 317260ce86c7SWei Liu v9fs_path_free(&path); 317360ce86c7SWei Liu out_nofid: 317460ce86c7SWei Liu pdu_complete(pdu, err); 317560ce86c7SWei Liu v9fs_string_free(&name); 317660ce86c7SWei Liu } 317760ce86c7SWei Liu 317860ce86c7SWei Liu 317960ce86c7SWei Liu /* Only works with path name based fid */ 31808440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 31818440e22eSGreg Kurz int32_t newdirfid, 31828440e22eSGreg Kurz V9fsString *name) 318360ce86c7SWei Liu { 318460ce86c7SWei Liu int err = 0; 318560ce86c7SWei Liu V9fsPath new_path; 318660ce86c7SWei Liu V9fsFidState *tfidp; 318760ce86c7SWei Liu V9fsState *s = pdu->s; 318860ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 318960ce86c7SWei Liu 319060ce86c7SWei Liu v9fs_path_init(&new_path); 319160ce86c7SWei Liu if (newdirfid != -1) { 319260ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 319360ce86c7SWei Liu if (dirfidp == NULL) { 3194b858e80aSDaniel Henrique Barboza return -ENOENT; 319560ce86c7SWei Liu } 319649dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 319749dd946bSGreg Kurz err = -EINVAL; 319849dd946bSGreg Kurz goto out; 319949dd946bSGreg Kurz } 32004fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 32014fa62005SGreg Kurz if (err < 0) { 32024fa62005SGreg Kurz goto out; 32034fa62005SGreg Kurz } 320460ce86c7SWei Liu } else { 32054d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 32064d8bc733SJan Dakinevich V9fsPath dir_path; 32074d8bc733SJan Dakinevich 32084d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 32094d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 32104d8bc733SJan Dakinevich g_free(dir_name); 32114d8bc733SJan Dakinevich 32124d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 32134d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 32144fa62005SGreg Kurz if (err < 0) { 32154fa62005SGreg Kurz goto out; 32164fa62005SGreg Kurz } 321760ce86c7SWei Liu } 321860ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 321960ce86c7SWei Liu if (err < 0) { 322060ce86c7SWei Liu goto out; 322160ce86c7SWei Liu } 322260ce86c7SWei Liu /* 322360ce86c7SWei Liu * Fixup fid's pointing to the old name to 322460ce86c7SWei Liu * start pointing to the new name 322560ce86c7SWei Liu */ 3226feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 322760ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 322860ce86c7SWei Liu /* replace the name */ 322960ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 323060ce86c7SWei Liu } 323160ce86c7SWei Liu } 323260ce86c7SWei Liu out: 323360ce86c7SWei Liu if (dirfidp) { 323460ce86c7SWei Liu put_fid(pdu, dirfidp); 323560ce86c7SWei Liu } 323660ce86c7SWei Liu v9fs_path_free(&new_path); 323760ce86c7SWei Liu return err; 323860ce86c7SWei Liu } 323960ce86c7SWei Liu 324060ce86c7SWei Liu /* Only works with path name based fid */ 32418440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 324260ce86c7SWei Liu { 324360ce86c7SWei Liu int32_t fid; 324460ce86c7SWei Liu ssize_t err = 0; 324560ce86c7SWei Liu size_t offset = 7; 324660ce86c7SWei Liu V9fsString name; 324760ce86c7SWei Liu int32_t newdirfid; 324860ce86c7SWei Liu V9fsFidState *fidp; 324960ce86c7SWei Liu V9fsPDU *pdu = opaque; 325060ce86c7SWei Liu V9fsState *s = pdu->s; 325160ce86c7SWei Liu 325260ce86c7SWei Liu v9fs_string_init(&name); 325360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 325460ce86c7SWei Liu if (err < 0) { 325560ce86c7SWei Liu goto out_nofid; 325660ce86c7SWei Liu } 3257fff39a7aSGreg Kurz 3258fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3259fff39a7aSGreg Kurz err = -ENOENT; 3260fff39a7aSGreg Kurz goto out_nofid; 3261fff39a7aSGreg Kurz } 3262fff39a7aSGreg Kurz 3263805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3264805b5d98SGreg Kurz err = -EISDIR; 3265805b5d98SGreg Kurz goto out_nofid; 3266805b5d98SGreg Kurz } 3267805b5d98SGreg Kurz 326860ce86c7SWei Liu fidp = get_fid(pdu, fid); 326960ce86c7SWei Liu if (fidp == NULL) { 327060ce86c7SWei Liu err = -ENOENT; 327160ce86c7SWei Liu goto out_nofid; 327260ce86c7SWei Liu } 327349dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 327449dd946bSGreg Kurz err = -EINVAL; 327549dd946bSGreg Kurz goto out; 327649dd946bSGreg Kurz } 327760ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 327860ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 327960ce86c7SWei Liu err = -EOPNOTSUPP; 328060ce86c7SWei Liu goto out; 328160ce86c7SWei Liu } 328260ce86c7SWei Liu v9fs_path_write_lock(s); 328360ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 328460ce86c7SWei Liu v9fs_path_unlock(s); 328560ce86c7SWei Liu if (!err) { 328660ce86c7SWei Liu err = offset; 328760ce86c7SWei Liu } 328860ce86c7SWei Liu out: 328960ce86c7SWei Liu put_fid(pdu, fidp); 329060ce86c7SWei Liu out_nofid: 329160ce86c7SWei Liu pdu_complete(pdu, err); 329260ce86c7SWei Liu v9fs_string_free(&name); 329360ce86c7SWei Liu } 329460ce86c7SWei Liu 32954fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 32968440e22eSGreg Kurz V9fsString *old_name, 32978440e22eSGreg Kurz V9fsPath *newdir, 329860ce86c7SWei Liu V9fsString *new_name) 329960ce86c7SWei Liu { 330060ce86c7SWei Liu V9fsFidState *tfidp; 330160ce86c7SWei Liu V9fsPath oldpath, newpath; 330260ce86c7SWei Liu V9fsState *s = pdu->s; 33034fa62005SGreg Kurz int err; 330460ce86c7SWei Liu 330560ce86c7SWei Liu v9fs_path_init(&oldpath); 330660ce86c7SWei Liu v9fs_path_init(&newpath); 33074fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 33084fa62005SGreg Kurz if (err < 0) { 33094fa62005SGreg Kurz goto out; 33104fa62005SGreg Kurz } 33114fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 33124fa62005SGreg Kurz if (err < 0) { 33134fa62005SGreg Kurz goto out; 33144fa62005SGreg Kurz } 331560ce86c7SWei Liu 331660ce86c7SWei Liu /* 331760ce86c7SWei Liu * Fixup fid's pointing to the old name to 331860ce86c7SWei Liu * start pointing to the new name 331960ce86c7SWei Liu */ 3320feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 332160ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 332260ce86c7SWei Liu /* replace the name */ 332360ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 332460ce86c7SWei Liu } 332560ce86c7SWei Liu } 33264fa62005SGreg Kurz out: 332760ce86c7SWei Liu v9fs_path_free(&oldpath); 332860ce86c7SWei Liu v9fs_path_free(&newpath); 33294fa62005SGreg Kurz return err; 333060ce86c7SWei Liu } 333160ce86c7SWei Liu 33328440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 33338440e22eSGreg Kurz V9fsString *old_name, 33348440e22eSGreg Kurz int32_t newdirfid, 333560ce86c7SWei Liu V9fsString *new_name) 333660ce86c7SWei Liu { 333760ce86c7SWei Liu int err = 0; 333860ce86c7SWei Liu V9fsState *s = pdu->s; 333960ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 334060ce86c7SWei Liu 334160ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 334260ce86c7SWei Liu if (olddirfidp == NULL) { 334360ce86c7SWei Liu err = -ENOENT; 334460ce86c7SWei Liu goto out; 334560ce86c7SWei Liu } 334660ce86c7SWei Liu if (newdirfid != -1) { 334760ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 334860ce86c7SWei Liu if (newdirfidp == NULL) { 334960ce86c7SWei Liu err = -ENOENT; 335060ce86c7SWei Liu goto out; 335160ce86c7SWei Liu } 335260ce86c7SWei Liu } else { 335360ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 335460ce86c7SWei Liu } 335560ce86c7SWei Liu 335660ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 335760ce86c7SWei Liu &newdirfidp->path, new_name); 335860ce86c7SWei Liu if (err < 0) { 335960ce86c7SWei Liu goto out; 336060ce86c7SWei Liu } 336160ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 336260ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 33634fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 336460ce86c7SWei Liu &newdirfidp->path, new_name); 336560ce86c7SWei Liu } 336660ce86c7SWei Liu out: 336760ce86c7SWei Liu if (olddirfidp) { 336860ce86c7SWei Liu put_fid(pdu, olddirfidp); 336960ce86c7SWei Liu } 337060ce86c7SWei Liu if (newdirfidp) { 337160ce86c7SWei Liu put_fid(pdu, newdirfidp); 337260ce86c7SWei Liu } 337360ce86c7SWei Liu return err; 337460ce86c7SWei Liu } 337560ce86c7SWei Liu 33768440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 337760ce86c7SWei Liu { 337860ce86c7SWei Liu ssize_t err = 0; 337960ce86c7SWei Liu size_t offset = 7; 338060ce86c7SWei Liu V9fsPDU *pdu = opaque; 338160ce86c7SWei Liu V9fsState *s = pdu->s; 338260ce86c7SWei Liu int32_t olddirfid, newdirfid; 338360ce86c7SWei Liu V9fsString old_name, new_name; 338460ce86c7SWei Liu 338560ce86c7SWei Liu v9fs_string_init(&old_name); 338660ce86c7SWei Liu v9fs_string_init(&new_name); 338760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 338860ce86c7SWei Liu &old_name, &newdirfid, &new_name); 338960ce86c7SWei Liu if (err < 0) { 339060ce86c7SWei Liu goto out_err; 339160ce86c7SWei Liu } 339260ce86c7SWei Liu 3393fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3394fff39a7aSGreg Kurz err = -ENOENT; 3395fff39a7aSGreg Kurz goto out_err; 3396fff39a7aSGreg Kurz } 3397fff39a7aSGreg Kurz 3398805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3399805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3400805b5d98SGreg Kurz err = -EISDIR; 3401805b5d98SGreg Kurz goto out_err; 3402805b5d98SGreg Kurz } 3403805b5d98SGreg Kurz 340460ce86c7SWei Liu v9fs_path_write_lock(s); 340560ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 340660ce86c7SWei Liu &old_name, newdirfid, &new_name); 340760ce86c7SWei Liu v9fs_path_unlock(s); 340860ce86c7SWei Liu if (!err) { 340960ce86c7SWei Liu err = offset; 341060ce86c7SWei Liu } 341160ce86c7SWei Liu 341260ce86c7SWei Liu out_err: 341360ce86c7SWei Liu pdu_complete(pdu, err); 341460ce86c7SWei Liu v9fs_string_free(&old_name); 341560ce86c7SWei Liu v9fs_string_free(&new_name); 341660ce86c7SWei Liu } 341760ce86c7SWei Liu 34188440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 341960ce86c7SWei Liu { 342060ce86c7SWei Liu int32_t fid; 342160ce86c7SWei Liu int err = 0; 342260ce86c7SWei Liu int16_t unused; 342360ce86c7SWei Liu V9fsStat v9stat; 342460ce86c7SWei Liu size_t offset = 7; 342560ce86c7SWei Liu struct stat stbuf; 342660ce86c7SWei Liu V9fsFidState *fidp; 342760ce86c7SWei Liu V9fsPDU *pdu = opaque; 34281d203986SGreg Kurz V9fsState *s = pdu->s; 342960ce86c7SWei Liu 343060ce86c7SWei Liu v9fs_stat_init(&v9stat); 343160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 343260ce86c7SWei Liu if (err < 0) { 343360ce86c7SWei Liu goto out_nofid; 343460ce86c7SWei Liu } 343560ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 343660ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 343760ce86c7SWei Liu 343860ce86c7SWei Liu fidp = get_fid(pdu, fid); 343960ce86c7SWei Liu if (fidp == NULL) { 344060ce86c7SWei Liu err = -EINVAL; 344160ce86c7SWei Liu goto out_nofid; 344260ce86c7SWei Liu } 344360ce86c7SWei Liu /* do we need to sync the file? */ 344460ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 344560ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 344660ce86c7SWei Liu goto out; 344760ce86c7SWei Liu } 344860ce86c7SWei Liu if (v9stat.mode != -1) { 344960ce86c7SWei Liu uint32_t v9_mode; 345060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 345160ce86c7SWei Liu if (err < 0) { 345260ce86c7SWei Liu goto out; 345360ce86c7SWei Liu } 345460ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 345560ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 345660ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 345760ce86c7SWei Liu /* Attempting to change the type */ 345860ce86c7SWei Liu err = -EIO; 345960ce86c7SWei Liu goto out; 346060ce86c7SWei Liu } 346160ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 346260ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 346360ce86c7SWei Liu &v9stat.extension)); 346460ce86c7SWei Liu if (err < 0) { 346560ce86c7SWei Liu goto out; 346660ce86c7SWei Liu } 346760ce86c7SWei Liu } 346860ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 346960ce86c7SWei Liu struct timespec times[2]; 347060ce86c7SWei Liu if (v9stat.atime != -1) { 347160ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 347260ce86c7SWei Liu times[0].tv_nsec = 0; 347360ce86c7SWei Liu } else { 347460ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 347560ce86c7SWei Liu } 347660ce86c7SWei Liu if (v9stat.mtime != -1) { 347760ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 347860ce86c7SWei Liu times[1].tv_nsec = 0; 347960ce86c7SWei Liu } else { 348060ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 348160ce86c7SWei Liu } 348260ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 348360ce86c7SWei Liu if (err < 0) { 348460ce86c7SWei Liu goto out; 348560ce86c7SWei Liu } 348660ce86c7SWei Liu } 348760ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 348860ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 348960ce86c7SWei Liu if (err < 0) { 349060ce86c7SWei Liu goto out; 349160ce86c7SWei Liu } 349260ce86c7SWei Liu } 349360ce86c7SWei Liu if (v9stat.name.size != 0) { 34941d203986SGreg Kurz v9fs_path_write_lock(s); 349560ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 34961d203986SGreg Kurz v9fs_path_unlock(s); 349760ce86c7SWei Liu if (err < 0) { 349860ce86c7SWei Liu goto out; 349960ce86c7SWei Liu } 350060ce86c7SWei Liu } 350160ce86c7SWei Liu if (v9stat.length != -1) { 350260ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 350360ce86c7SWei Liu if (err < 0) { 350460ce86c7SWei Liu goto out; 350560ce86c7SWei Liu } 350660ce86c7SWei Liu } 350760ce86c7SWei Liu err = offset; 350860ce86c7SWei Liu out: 350960ce86c7SWei Liu put_fid(pdu, fidp); 351060ce86c7SWei Liu out_nofid: 351160ce86c7SWei Liu v9fs_stat_free(&v9stat); 351260ce86c7SWei Liu pdu_complete(pdu, err); 351360ce86c7SWei Liu } 351460ce86c7SWei Liu 351560ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 351660ce86c7SWei Liu { 351760ce86c7SWei Liu uint32_t f_type; 351860ce86c7SWei Liu uint32_t f_bsize; 351960ce86c7SWei Liu uint64_t f_blocks; 352060ce86c7SWei Liu uint64_t f_bfree; 352160ce86c7SWei Liu uint64_t f_bavail; 352260ce86c7SWei Liu uint64_t f_files; 352360ce86c7SWei Liu uint64_t f_ffree; 352460ce86c7SWei Liu uint64_t fsid_val; 352560ce86c7SWei Liu uint32_t f_namelen; 352660ce86c7SWei Liu size_t offset = 7; 352760ce86c7SWei Liu int32_t bsize_factor; 352860ce86c7SWei Liu 352960ce86c7SWei Liu /* 353060ce86c7SWei Liu * compute bsize factor based on host file system block size 353160ce86c7SWei Liu * and client msize 353260ce86c7SWei Liu */ 353360ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 353460ce86c7SWei Liu if (!bsize_factor) { 353560ce86c7SWei Liu bsize_factor = 1; 353660ce86c7SWei Liu } 353760ce86c7SWei Liu f_type = stbuf->f_type; 353860ce86c7SWei Liu f_bsize = stbuf->f_bsize; 353960ce86c7SWei Liu f_bsize *= bsize_factor; 354060ce86c7SWei Liu /* 354160ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 354260ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 354360ce86c7SWei Liu * blocks by bsize factor 354460ce86c7SWei Liu */ 354560ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 354660ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 354760ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 354860ce86c7SWei Liu f_files = stbuf->f_files; 354960ce86c7SWei Liu f_ffree = stbuf->f_ffree; 3550f41db099SKeno Fischer #ifdef CONFIG_DARWIN 3551f41db099SKeno Fischer fsid_val = (unsigned int)stbuf->f_fsid.val[0] | 3552f41db099SKeno Fischer (unsigned long long)stbuf->f_fsid.val[1] << 32; 3553f41db099SKeno Fischer f_namelen = NAME_MAX; 3554f41db099SKeno Fischer #else 355560ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 355660ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 355760ce86c7SWei Liu f_namelen = stbuf->f_namelen; 3558f41db099SKeno Fischer #endif 355960ce86c7SWei Liu 356060ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 356160ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 356260ce86c7SWei Liu f_bavail, f_files, f_ffree, 356360ce86c7SWei Liu fsid_val, f_namelen); 356460ce86c7SWei Liu } 356560ce86c7SWei Liu 35668440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 356760ce86c7SWei Liu { 356860ce86c7SWei Liu int32_t fid; 356960ce86c7SWei Liu ssize_t retval = 0; 357060ce86c7SWei Liu size_t offset = 7; 357160ce86c7SWei Liu V9fsFidState *fidp; 357260ce86c7SWei Liu struct statfs stbuf; 357360ce86c7SWei Liu V9fsPDU *pdu = opaque; 357460ce86c7SWei Liu V9fsState *s = pdu->s; 357560ce86c7SWei Liu 357660ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 357760ce86c7SWei Liu if (retval < 0) { 357860ce86c7SWei Liu goto out_nofid; 357960ce86c7SWei Liu } 358060ce86c7SWei Liu fidp = get_fid(pdu, fid); 358160ce86c7SWei Liu if (fidp == NULL) { 358260ce86c7SWei Liu retval = -ENOENT; 358360ce86c7SWei Liu goto out_nofid; 358460ce86c7SWei Liu } 358560ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 358660ce86c7SWei Liu if (retval < 0) { 358760ce86c7SWei Liu goto out; 358860ce86c7SWei Liu } 358960ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 359060ce86c7SWei Liu if (retval < 0) { 359160ce86c7SWei Liu goto out; 359260ce86c7SWei Liu } 359360ce86c7SWei Liu retval += offset; 359460ce86c7SWei Liu out: 359560ce86c7SWei Liu put_fid(pdu, fidp); 359660ce86c7SWei Liu out_nofid: 359760ce86c7SWei Liu pdu_complete(pdu, retval); 359860ce86c7SWei Liu } 359960ce86c7SWei Liu 36008440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 360160ce86c7SWei Liu { 360260ce86c7SWei Liu 360360ce86c7SWei Liu int mode; 360460ce86c7SWei Liu gid_t gid; 360560ce86c7SWei Liu int32_t fid; 360660ce86c7SWei Liu V9fsQID qid; 360760ce86c7SWei Liu int err = 0; 360860ce86c7SWei Liu int major, minor; 360960ce86c7SWei Liu size_t offset = 7; 361060ce86c7SWei Liu V9fsString name; 361160ce86c7SWei Liu struct stat stbuf; 361260ce86c7SWei Liu V9fsFidState *fidp; 361360ce86c7SWei Liu V9fsPDU *pdu = opaque; 361460ce86c7SWei Liu 361560ce86c7SWei Liu v9fs_string_init(&name); 361660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 361760ce86c7SWei Liu &major, &minor, &gid); 361860ce86c7SWei Liu if (err < 0) { 361960ce86c7SWei Liu goto out_nofid; 362060ce86c7SWei Liu } 362160ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 362260ce86c7SWei Liu 3623fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3624fff39a7aSGreg Kurz err = -ENOENT; 3625fff39a7aSGreg Kurz goto out_nofid; 3626fff39a7aSGreg Kurz } 3627fff39a7aSGreg Kurz 3628805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3629805b5d98SGreg Kurz err = -EEXIST; 3630805b5d98SGreg Kurz goto out_nofid; 3631805b5d98SGreg Kurz } 3632805b5d98SGreg Kurz 363360ce86c7SWei Liu fidp = get_fid(pdu, fid); 363460ce86c7SWei Liu if (fidp == NULL) { 363560ce86c7SWei Liu err = -ENOENT; 363660ce86c7SWei Liu goto out_nofid; 363760ce86c7SWei Liu } 363860ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 363960ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 364060ce86c7SWei Liu if (err < 0) { 364160ce86c7SWei Liu goto out; 364260ce86c7SWei Liu } 36433b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36443b5ee9e8SAntonios Motakis if (err < 0) { 36453b5ee9e8SAntonios Motakis goto out; 36463b5ee9e8SAntonios Motakis } 364760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 364860ce86c7SWei Liu if (err < 0) { 364960ce86c7SWei Liu goto out; 365060ce86c7SWei Liu } 365160ce86c7SWei Liu err += offset; 365260ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 365360ce86c7SWei Liu qid.type, qid.version, qid.path); 365460ce86c7SWei Liu out: 365560ce86c7SWei Liu put_fid(pdu, fidp); 365660ce86c7SWei Liu out_nofid: 365760ce86c7SWei Liu pdu_complete(pdu, err); 365860ce86c7SWei Liu v9fs_string_free(&name); 365960ce86c7SWei Liu } 366060ce86c7SWei Liu 366160ce86c7SWei Liu /* 366260ce86c7SWei Liu * Implement posix byte range locking code 366360ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 366460ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 366560ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 366660ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 366760ce86c7SWei Liu * So when a TLOCK request comes, always return success 366860ce86c7SWei Liu */ 36698440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 367060ce86c7SWei Liu { 367160ce86c7SWei Liu V9fsFlock flock; 367260ce86c7SWei Liu size_t offset = 7; 367360ce86c7SWei Liu struct stat stbuf; 367460ce86c7SWei Liu V9fsFidState *fidp; 367560ce86c7SWei Liu int32_t fid, err = 0; 367660ce86c7SWei Liu V9fsPDU *pdu = opaque; 367760ce86c7SWei Liu 367860ce86c7SWei Liu v9fs_string_init(&flock.client_id); 367960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 368060ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 368160ce86c7SWei Liu &flock.proc_id, &flock.client_id); 368260ce86c7SWei Liu if (err < 0) { 368360ce86c7SWei Liu goto out_nofid; 368460ce86c7SWei Liu } 368560ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 368660ce86c7SWei Liu flock.type, flock.start, flock.length); 368760ce86c7SWei Liu 368860ce86c7SWei Liu 368960ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 369060ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 369160ce86c7SWei Liu err = -EINVAL; 369260ce86c7SWei Liu goto out_nofid; 369360ce86c7SWei Liu } 369460ce86c7SWei Liu fidp = get_fid(pdu, fid); 369560ce86c7SWei Liu if (fidp == NULL) { 369660ce86c7SWei Liu err = -ENOENT; 369760ce86c7SWei Liu goto out_nofid; 369860ce86c7SWei Liu } 369960ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 370060ce86c7SWei Liu if (err < 0) { 370160ce86c7SWei Liu goto out; 370260ce86c7SWei Liu } 37034bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 37044bae2b39SPaolo Bonzini if (err < 0) { 37054bae2b39SPaolo Bonzini goto out; 37064bae2b39SPaolo Bonzini } 37074bae2b39SPaolo Bonzini err += offset; 37084bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 370960ce86c7SWei Liu out: 371060ce86c7SWei Liu put_fid(pdu, fidp); 371160ce86c7SWei Liu out_nofid: 371260ce86c7SWei Liu pdu_complete(pdu, err); 371360ce86c7SWei Liu v9fs_string_free(&flock.client_id); 371460ce86c7SWei Liu } 371560ce86c7SWei Liu 371660ce86c7SWei Liu /* 371760ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 371860ce86c7SWei Liu * handling is done by client's VFS layer. 371960ce86c7SWei Liu */ 37208440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 372160ce86c7SWei Liu { 372260ce86c7SWei Liu size_t offset = 7; 372360ce86c7SWei Liu struct stat stbuf; 372460ce86c7SWei Liu V9fsFidState *fidp; 372560ce86c7SWei Liu V9fsGetlock glock; 372660ce86c7SWei Liu int32_t fid, err = 0; 372760ce86c7SWei Liu V9fsPDU *pdu = opaque; 372860ce86c7SWei Liu 372960ce86c7SWei Liu v9fs_string_init(&glock.client_id); 373060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 373160ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 373260ce86c7SWei Liu &glock.client_id); 373360ce86c7SWei Liu if (err < 0) { 373460ce86c7SWei Liu goto out_nofid; 373560ce86c7SWei Liu } 373660ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 373760ce86c7SWei Liu glock.type, glock.start, glock.length); 373860ce86c7SWei Liu 373960ce86c7SWei Liu fidp = get_fid(pdu, fid); 374060ce86c7SWei Liu if (fidp == NULL) { 374160ce86c7SWei Liu err = -ENOENT; 374260ce86c7SWei Liu goto out_nofid; 374360ce86c7SWei Liu } 374460ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 374560ce86c7SWei Liu if (err < 0) { 374660ce86c7SWei Liu goto out; 374760ce86c7SWei Liu } 374860ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 374960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 375060ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 375160ce86c7SWei Liu &glock.client_id); 375260ce86c7SWei Liu if (err < 0) { 375360ce86c7SWei Liu goto out; 375460ce86c7SWei Liu } 375560ce86c7SWei Liu err += offset; 375660ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 375760ce86c7SWei Liu glock.length, glock.proc_id); 375860ce86c7SWei Liu out: 375960ce86c7SWei Liu put_fid(pdu, fidp); 376060ce86c7SWei Liu out_nofid: 376160ce86c7SWei Liu pdu_complete(pdu, err); 376260ce86c7SWei Liu v9fs_string_free(&glock.client_id); 376360ce86c7SWei Liu } 376460ce86c7SWei Liu 37658440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 376660ce86c7SWei Liu { 376760ce86c7SWei Liu V9fsPDU *pdu = opaque; 376860ce86c7SWei Liu size_t offset = 7; 376960ce86c7SWei Liu int32_t fid; 377060ce86c7SWei Liu struct stat stbuf; 377160ce86c7SWei Liu V9fsQID qid; 377260ce86c7SWei Liu V9fsString name; 377360ce86c7SWei Liu V9fsFidState *fidp; 377460ce86c7SWei Liu gid_t gid; 377560ce86c7SWei Liu int mode; 377660ce86c7SWei Liu int err = 0; 377760ce86c7SWei Liu 377860ce86c7SWei Liu v9fs_string_init(&name); 377960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 378060ce86c7SWei Liu if (err < 0) { 378160ce86c7SWei Liu goto out_nofid; 378260ce86c7SWei Liu } 378360ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 378460ce86c7SWei Liu 3785fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3786fff39a7aSGreg Kurz err = -ENOENT; 3787fff39a7aSGreg Kurz goto out_nofid; 3788fff39a7aSGreg Kurz } 3789fff39a7aSGreg Kurz 3790805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3791805b5d98SGreg Kurz err = -EEXIST; 3792805b5d98SGreg Kurz goto out_nofid; 3793805b5d98SGreg Kurz } 3794805b5d98SGreg Kurz 379560ce86c7SWei Liu fidp = get_fid(pdu, fid); 379660ce86c7SWei Liu if (fidp == NULL) { 379760ce86c7SWei Liu err = -ENOENT; 379860ce86c7SWei Liu goto out_nofid; 379960ce86c7SWei Liu } 380060ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 380160ce86c7SWei Liu if (err < 0) { 380260ce86c7SWei Liu goto out; 380360ce86c7SWei Liu } 38043b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 38053b5ee9e8SAntonios Motakis if (err < 0) { 38063b5ee9e8SAntonios Motakis goto out; 38073b5ee9e8SAntonios Motakis } 380860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 380960ce86c7SWei Liu if (err < 0) { 381060ce86c7SWei Liu goto out; 381160ce86c7SWei Liu } 381260ce86c7SWei Liu err += offset; 381360ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 381460ce86c7SWei Liu qid.type, qid.version, qid.path, err); 381560ce86c7SWei Liu out: 381660ce86c7SWei Liu put_fid(pdu, fidp); 381760ce86c7SWei Liu out_nofid: 381860ce86c7SWei Liu pdu_complete(pdu, err); 381960ce86c7SWei Liu v9fs_string_free(&name); 382060ce86c7SWei Liu } 382160ce86c7SWei Liu 38228440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 382360ce86c7SWei Liu { 382460ce86c7SWei Liu int64_t size; 382560ce86c7SWei Liu V9fsString name; 382660ce86c7SWei Liu ssize_t err = 0; 382760ce86c7SWei Liu size_t offset = 7; 382860ce86c7SWei Liu int32_t fid, newfid; 382960ce86c7SWei Liu V9fsFidState *file_fidp; 383060ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 383160ce86c7SWei Liu V9fsPDU *pdu = opaque; 383260ce86c7SWei Liu V9fsState *s = pdu->s; 383360ce86c7SWei Liu 383460ce86c7SWei Liu v9fs_string_init(&name); 383560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 383660ce86c7SWei Liu if (err < 0) { 383760ce86c7SWei Liu goto out_nofid; 383860ce86c7SWei Liu } 383960ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 384060ce86c7SWei Liu 384160ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 384260ce86c7SWei Liu if (file_fidp == NULL) { 384360ce86c7SWei Liu err = -ENOENT; 384460ce86c7SWei Liu goto out_nofid; 384560ce86c7SWei Liu } 384660ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 384760ce86c7SWei Liu if (xattr_fidp == NULL) { 384860ce86c7SWei Liu err = -EINVAL; 384960ce86c7SWei Liu goto out; 385060ce86c7SWei Liu } 385160ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3852ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 385360ce86c7SWei Liu /* 385460ce86c7SWei Liu * listxattr request. Get the size first 385560ce86c7SWei Liu */ 385660ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 385760ce86c7SWei Liu if (size < 0) { 385860ce86c7SWei Liu err = size; 385960ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 386060ce86c7SWei Liu goto out; 386160ce86c7SWei Liu } 386260ce86c7SWei Liu /* 386360ce86c7SWei Liu * Read the xattr value 386460ce86c7SWei Liu */ 386560ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 386660ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3867dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38687bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3869a647502cSKeno Fischer if (size) { 387060ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 387160ce86c7SWei Liu xattr_fidp->fs.xattr.value, 387260ce86c7SWei Liu xattr_fidp->fs.xattr.len); 387360ce86c7SWei Liu if (err < 0) { 387460ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 387560ce86c7SWei Liu goto out; 387660ce86c7SWei Liu } 387760ce86c7SWei Liu } 387860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 387960ce86c7SWei Liu if (err < 0) { 388060ce86c7SWei Liu goto out; 388160ce86c7SWei Liu } 388260ce86c7SWei Liu err += offset; 388360ce86c7SWei Liu } else { 388460ce86c7SWei Liu /* 388560ce86c7SWei Liu * specific xattr fid. We check for xattr 388660ce86c7SWei Liu * presence also collect the xattr size 388760ce86c7SWei Liu */ 388860ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 388960ce86c7SWei Liu &name, NULL, 0); 389060ce86c7SWei Liu if (size < 0) { 389160ce86c7SWei Liu err = size; 389260ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 389360ce86c7SWei Liu goto out; 389460ce86c7SWei Liu } 389560ce86c7SWei Liu /* 389660ce86c7SWei Liu * Read the xattr value 389760ce86c7SWei Liu */ 389860ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 389960ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3900dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 39017bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3902a647502cSKeno Fischer if (size) { 390360ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 390460ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 390560ce86c7SWei Liu xattr_fidp->fs.xattr.len); 390660ce86c7SWei Liu if (err < 0) { 390760ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 390860ce86c7SWei Liu goto out; 390960ce86c7SWei Liu } 391060ce86c7SWei Liu } 391160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 391260ce86c7SWei Liu if (err < 0) { 391360ce86c7SWei Liu goto out; 391460ce86c7SWei Liu } 391560ce86c7SWei Liu err += offset; 391660ce86c7SWei Liu } 391760ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 391860ce86c7SWei Liu out: 391960ce86c7SWei Liu put_fid(pdu, file_fidp); 392060ce86c7SWei Liu if (xattr_fidp) { 392160ce86c7SWei Liu put_fid(pdu, xattr_fidp); 392260ce86c7SWei Liu } 392360ce86c7SWei Liu out_nofid: 392460ce86c7SWei Liu pdu_complete(pdu, err); 392560ce86c7SWei Liu v9fs_string_free(&name); 392660ce86c7SWei Liu } 392760ce86c7SWei Liu 39288440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 392960ce86c7SWei Liu { 3930aca6897fSKeno Fischer int flags, rflags = 0; 393160ce86c7SWei Liu int32_t fid; 39323b79ef2cSGreg Kurz uint64_t size; 393360ce86c7SWei Liu ssize_t err = 0; 393460ce86c7SWei Liu V9fsString name; 393560ce86c7SWei Liu size_t offset = 7; 393660ce86c7SWei Liu V9fsFidState *file_fidp; 393760ce86c7SWei Liu V9fsFidState *xattr_fidp; 393860ce86c7SWei Liu V9fsPDU *pdu = opaque; 393960ce86c7SWei Liu 394060ce86c7SWei Liu v9fs_string_init(&name); 394160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 394260ce86c7SWei Liu if (err < 0) { 394360ce86c7SWei Liu goto out_nofid; 394460ce86c7SWei Liu } 394560ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 394660ce86c7SWei Liu 3947aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3948aca6897fSKeno Fischer err = -EINVAL; 3949aca6897fSKeno Fischer goto out_nofid; 3950aca6897fSKeno Fischer } 3951aca6897fSKeno Fischer 3952aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3953aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3954aca6897fSKeno Fischer } 3955aca6897fSKeno Fischer 3956aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3957aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3958aca6897fSKeno Fischer } 3959aca6897fSKeno Fischer 396038d7fd68SKeno Fischer if (size > P9_XATTR_SIZE_MAX) { 39613b79ef2cSGreg Kurz err = -E2BIG; 39623b79ef2cSGreg Kurz goto out_nofid; 39633b79ef2cSGreg Kurz } 39643b79ef2cSGreg Kurz 396560ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 396660ce86c7SWei Liu if (file_fidp == NULL) { 396760ce86c7SWei Liu err = -EINVAL; 396860ce86c7SWei Liu goto out_nofid; 396960ce86c7SWei Liu } 3970dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3971dd654e03SGreg Kurz err = -EINVAL; 3972dd654e03SGreg Kurz goto out_put_fid; 3973dd654e03SGreg Kurz } 3974dd654e03SGreg Kurz 397560ce86c7SWei Liu /* Make the file fid point to xattr */ 397660ce86c7SWei Liu xattr_fidp = file_fidp; 397760ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 397860ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3979dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 398060ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3981aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 398260ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 398360ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3984eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 398560ce86c7SWei Liu err = offset; 3986dd654e03SGreg Kurz out_put_fid: 398760ce86c7SWei Liu put_fid(pdu, file_fidp); 398860ce86c7SWei Liu out_nofid: 398960ce86c7SWei Liu pdu_complete(pdu, err); 399060ce86c7SWei Liu v9fs_string_free(&name); 399160ce86c7SWei Liu } 399260ce86c7SWei Liu 39938440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 399460ce86c7SWei Liu { 399560ce86c7SWei Liu V9fsPDU *pdu = opaque; 399660ce86c7SWei Liu size_t offset = 7; 399760ce86c7SWei Liu V9fsString target; 399860ce86c7SWei Liu int32_t fid; 399960ce86c7SWei Liu int err = 0; 400060ce86c7SWei Liu V9fsFidState *fidp; 400160ce86c7SWei Liu 400260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 400360ce86c7SWei Liu if (err < 0) { 400460ce86c7SWei Liu goto out_nofid; 400560ce86c7SWei Liu } 400660ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 400760ce86c7SWei Liu fidp = get_fid(pdu, fid); 400860ce86c7SWei Liu if (fidp == NULL) { 400960ce86c7SWei Liu err = -ENOENT; 401060ce86c7SWei Liu goto out_nofid; 401160ce86c7SWei Liu } 401260ce86c7SWei Liu 401360ce86c7SWei Liu v9fs_string_init(&target); 401460ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 401560ce86c7SWei Liu if (err < 0) { 401660ce86c7SWei Liu goto out; 401760ce86c7SWei Liu } 401860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 401960ce86c7SWei Liu if (err < 0) { 402060ce86c7SWei Liu v9fs_string_free(&target); 402160ce86c7SWei Liu goto out; 402260ce86c7SWei Liu } 402360ce86c7SWei Liu err += offset; 402460ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 402560ce86c7SWei Liu v9fs_string_free(&target); 402660ce86c7SWei Liu out: 402760ce86c7SWei Liu put_fid(pdu, fidp); 402860ce86c7SWei Liu out_nofid: 402960ce86c7SWei Liu pdu_complete(pdu, err); 403060ce86c7SWei Liu } 403160ce86c7SWei Liu 403260ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 403360ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 403460ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 403560ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 403660ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 403760ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 403860ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 403960ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 404060ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 404160ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 404260ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 404360ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 404460ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 404560ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 404660ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 404760ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 404860ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 404960ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 405060ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 405160ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 405260ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 405360ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 405460ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 405560ce86c7SWei Liu [P9_TREAD] = v9fs_read, 405660ce86c7SWei Liu #if 0 405760ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 405860ce86c7SWei Liu #endif 405960ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 406060ce86c7SWei Liu [P9_TLINK] = v9fs_link, 406160ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 406260ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 406360ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 406460ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 406560ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 406660ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 406760ce86c7SWei Liu }; 406860ce86c7SWei Liu 40698440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 407060ce86c7SWei Liu { 407160ce86c7SWei Liu V9fsPDU *pdu = opaque; 407260ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 407360ce86c7SWei Liu } 407460ce86c7SWei Liu 40758440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 407660ce86c7SWei Liu { 407760ce86c7SWei Liu V9fsPDU *pdu = opaque; 407860ce86c7SWei Liu pdu_complete(pdu, -EROFS); 407960ce86c7SWei Liu } 408060ce86c7SWei Liu 408160ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 408260ce86c7SWei Liu { 408360ce86c7SWei Liu switch (pdu->id) { 408460ce86c7SWei Liu case P9_TREADDIR: 408560ce86c7SWei Liu case P9_TSTATFS: 408660ce86c7SWei Liu case P9_TGETATTR: 408760ce86c7SWei Liu case P9_TXATTRWALK: 408860ce86c7SWei Liu case P9_TLOCK: 408960ce86c7SWei Liu case P9_TGETLOCK: 409060ce86c7SWei Liu case P9_TREADLINK: 409160ce86c7SWei Liu case P9_TVERSION: 409260ce86c7SWei Liu case P9_TLOPEN: 409360ce86c7SWei Liu case P9_TATTACH: 409460ce86c7SWei Liu case P9_TSTAT: 409560ce86c7SWei Liu case P9_TWALK: 409660ce86c7SWei Liu case P9_TCLUNK: 409760ce86c7SWei Liu case P9_TFSYNC: 409860ce86c7SWei Liu case P9_TOPEN: 409960ce86c7SWei Liu case P9_TREAD: 410060ce86c7SWei Liu case P9_TAUTH: 410160ce86c7SWei Liu case P9_TFLUSH: 410260ce86c7SWei Liu return 1; 410360ce86c7SWei Liu default: 410460ce86c7SWei Liu return 0; 410560ce86c7SWei Liu } 410660ce86c7SWei Liu } 410760ce86c7SWei Liu 4108506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 410960ce86c7SWei Liu { 411060ce86c7SWei Liu Coroutine *co; 411160ce86c7SWei Liu CoroutineEntry *handler; 411260ce86c7SWei Liu V9fsState *s = pdu->s; 411360ce86c7SWei Liu 4114506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4115506f3275SGreg Kurz pdu->id = hdr->id; 4116506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4117506f3275SGreg Kurz 411860ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 411960ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 412060ce86c7SWei Liu handler = v9fs_op_not_supp; 4121d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4122d1471233SGreg Kurz handler = v9fs_fs_ro; 412360ce86c7SWei Liu } else { 412460ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 412560ce86c7SWei Liu } 412660ce86c7SWei Liu 4127506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 41280b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 41290b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 413060ce86c7SWei Liu } 413160ce86c7SWei Liu 41322a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4133066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4134066eb006SGreg Kurz Error **errp) 41352a0c56aaSWei Liu { 413692c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 41372a0c56aaSWei Liu int i, len; 41382a0c56aaSWei Liu struct stat stat; 41392a0c56aaSWei Liu FsDriverEntry *fse; 41402a0c56aaSWei Liu V9fsPath path; 41412a0c56aaSWei Liu int rc = 1; 41422a0c56aaSWei Liu 4143066eb006SGreg Kurz assert(!s->transport); 4144066eb006SGreg Kurz s->transport = t; 4145066eb006SGreg Kurz 41462a0c56aaSWei Liu /* initialize pdu allocator */ 41472a0c56aaSWei Liu QLIST_INIT(&s->free_list); 41482a0c56aaSWei Liu QLIST_INIT(&s->active_list); 41490d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4150583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4151583f21f8SStefano Stabellini s->pdus[i].s = s; 4152583f21f8SStefano Stabellini s->pdus[i].idx = i; 41532a0c56aaSWei Liu } 41542a0c56aaSWei Liu 41552a0c56aaSWei Liu v9fs_path_init(&path); 41562a0c56aaSWei Liu 41572a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 41582a0c56aaSWei Liu 41592a0c56aaSWei Liu if (!fse) { 41602a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 41612a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 41622a0c56aaSWei Liu "id = %s", 41632a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 41642a0c56aaSWei Liu goto out; 41652a0c56aaSWei Liu } 41662a0c56aaSWei Liu 41672a0c56aaSWei Liu if (!s->fsconf.tag) { 41682a0c56aaSWei Liu /* we haven't specified a mount_tag */ 41692a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 41702a0c56aaSWei Liu s->fsconf.fsdev_id); 41712a0c56aaSWei Liu goto out; 41722a0c56aaSWei Liu } 41732a0c56aaSWei Liu 41742a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 41752a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 41762a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 41772a0c56aaSWei Liu len = strlen(s->fsconf.tag); 41782a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 41792a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 41802a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 41812a0c56aaSWei Liu goto out; 41822a0c56aaSWei Liu } 41832a0c56aaSWei Liu 41842a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 41852a0c56aaSWei Liu s->ctx.uid = -1; 41862a0c56aaSWei Liu 41872a0c56aaSWei Liu s->ops = fse->ops; 41882a0c56aaSWei Liu 4189b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4190b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4191b96feb2cSTobias Schramm 4192feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 41932a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 41942a0c56aaSWei Liu 419565603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 419665603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 419765603a80SGreg Kurz s->fsconf.fsdev_id); 41982a0c56aaSWei Liu goto out; 41992a0c56aaSWei Liu } 42002a0c56aaSWei Liu 42012a0c56aaSWei Liu /* 42022a0c56aaSWei Liu * Check details of export path, We need to use fs driver 42032a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 42042a0c56aaSWei Liu * use co-routines here. 42052a0c56aaSWei Liu */ 42062a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 42072a0c56aaSWei Liu error_setg(errp, 42082a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 42092a0c56aaSWei Liu goto out; 42102a0c56aaSWei Liu } 42112a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 42122a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 42132a0c56aaSWei Liu goto out; 42142a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 42152a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 42162a0c56aaSWei Liu goto out; 42172a0c56aaSWei Liu } 4218b8bbdb88SPradeep Jagadeesh 42193b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 42203b5ee9e8SAntonios Motakis 42216b6aa828SChristian Schoenebeck /* init inode remapping : */ 42226b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 42236b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 42246b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 42256b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 42266b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 42271a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 42286b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 42296b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4230f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 42311a6ed33cSAntonios Motakis 4232b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4233b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4234b8bbdb88SPradeep Jagadeesh 42352a0c56aaSWei Liu rc = 0; 42362a0c56aaSWei Liu out: 42372a0c56aaSWei Liu if (rc) { 4238b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4239702dbcc2SLi Qiang } 42402a0c56aaSWei Liu v9fs_path_free(&path); 42412a0c56aaSWei Liu return rc; 42422a0c56aaSWei Liu } 42432a0c56aaSWei Liu 4244b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 42452a0c56aaSWei Liu { 4246c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4247702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4248702dbcc2SLi Qiang } 4249c0da0cb7SGreg Kurz if (s->ctx.fst) { 4250b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4251c0da0cb7SGreg Kurz } 42522a0c56aaSWei Liu g_free(s->tag); 42536b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4254f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4255f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 42564774718eSLi Qiang g_free(s->ctx.fs_root); 42572a0c56aaSWei Liu } 42582a0c56aaSWei Liu 42590e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 42600e44a0fdSGreg Kurz V9fsPDU pdu; 42610e44a0fdSGreg Kurz bool done; 42620e44a0fdSGreg Kurz } VirtfsCoResetData; 42630e44a0fdSGreg Kurz 42640e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 42650e44a0fdSGreg Kurz { 42660e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 42670e44a0fdSGreg Kurz 42680e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 42690e44a0fdSGreg Kurz data->done = true; 42700e44a0fdSGreg Kurz } 42710e44a0fdSGreg Kurz 42720e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 42730e44a0fdSGreg Kurz { 42740e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 42750e44a0fdSGreg Kurz Coroutine *co; 42760e44a0fdSGreg Kurz 42770e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 42780e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42790e44a0fdSGreg Kurz } 42800e44a0fdSGreg Kurz 42810e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 42820e44a0fdSGreg Kurz qemu_coroutine_enter(co); 42830e44a0fdSGreg Kurz 42840e44a0fdSGreg Kurz while (!data.done) { 42850e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42860e44a0fdSGreg Kurz } 42870e44a0fdSGreg Kurz } 42880e44a0fdSGreg Kurz 428960ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 429060ce86c7SWei Liu { 429160ce86c7SWei Liu struct rlimit rlim; 429260ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 429363325b18SGreg Kurz error_report("Failed to get the resource limit"); 429460ce86c7SWei Liu exit(1); 429560ce86c7SWei Liu } 429660ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 429760ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 429860ce86c7SWei Liu } 4299