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 14fbc04127SPeter Maydell #include "qemu/osdep.h" 15e3e83f2eSGreg Kurz #include <glib/gprintf.h> 1660ce86c7SWei Liu #include "hw/virtio/virtio.h" 17da34e65cSMarkus Armbruster #include "qapi/error.h" 1860ce86c7SWei Liu #include "qemu/error-report.h" 1960ce86c7SWei Liu #include "qemu/iov.h" 20db725815SMarkus Armbruster #include "qemu/main-loop.h" 2160ce86c7SWei Liu #include "qemu/sockets.h" 2260ce86c7SWei Liu #include "virtio-9p.h" 2360ce86c7SWei Liu #include "fsdev/qemu-fsdev.h" 2460ce86c7SWei Liu #include "9p-xattr.h" 2560ce86c7SWei Liu #include "coth.h" 2660ce86c7SWei Liu #include "trace.h" 27795c40b8SJuan Quintela #include "migration/blocker.h" 28357e2f7fSGreg Kurz #include "sysemu/qtest.h" 291a6ed33cSAntonios Motakis #include "qemu/xxhash.h" 306b6aa828SChristian Schoenebeck #include <math.h> 3103556ea9SDan Robertson #include <linux/limits.h> 3260ce86c7SWei Liu 3360ce86c7SWei Liu int open_fd_hw; 3460ce86c7SWei Liu int total_open_fd; 3560ce86c7SWei Liu static int open_fd_rc; 3660ce86c7SWei Liu 3760ce86c7SWei Liu enum { 3860ce86c7SWei Liu Oread = 0x00, 3960ce86c7SWei Liu Owrite = 0x01, 4060ce86c7SWei Liu Ordwr = 0x02, 4160ce86c7SWei Liu Oexec = 0x03, 4260ce86c7SWei Liu Oexcl = 0x04, 4360ce86c7SWei Liu Otrunc = 0x10, 4460ce86c7SWei Liu Orexec = 0x20, 4560ce86c7SWei Liu Orclose = 0x40, 4660ce86c7SWei Liu Oappend = 0x80, 4760ce86c7SWei Liu }; 4860ce86c7SWei Liu 4975673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 5060ce86c7SWei Liu { 5160ce86c7SWei Liu ssize_t ret; 5260ce86c7SWei Liu va_list ap; 5360ce86c7SWei Liu 5460ce86c7SWei Liu va_start(ap, fmt); 55ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 5660ce86c7SWei Liu va_end(ap); 5760ce86c7SWei Liu 5860ce86c7SWei Liu return ret; 5960ce86c7SWei Liu } 6060ce86c7SWei Liu 6175673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 6260ce86c7SWei Liu { 6360ce86c7SWei Liu ssize_t ret; 6460ce86c7SWei Liu va_list ap; 6560ce86c7SWei Liu 6660ce86c7SWei Liu va_start(ap, fmt); 67ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 6860ce86c7SWei Liu va_end(ap); 6960ce86c7SWei Liu 7060ce86c7SWei Liu return ret; 7160ce86c7SWei Liu } 7260ce86c7SWei Liu 7360ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 7460ce86c7SWei Liu { 7560ce86c7SWei Liu int ret = 0; 7660ce86c7SWei Liu 7760ce86c7SWei Liu switch (mode & 3) { 7860ce86c7SWei Liu case Oread: 7960ce86c7SWei Liu ret = O_RDONLY; 8060ce86c7SWei Liu break; 8160ce86c7SWei Liu case Ordwr: 8260ce86c7SWei Liu ret = O_RDWR; 8360ce86c7SWei Liu break; 8460ce86c7SWei Liu case Owrite: 8560ce86c7SWei Liu ret = O_WRONLY; 8660ce86c7SWei Liu break; 8760ce86c7SWei Liu case Oexec: 8860ce86c7SWei Liu ret = O_RDONLY; 8960ce86c7SWei Liu break; 9060ce86c7SWei Liu } 9160ce86c7SWei Liu 9260ce86c7SWei Liu if (mode & Otrunc) { 9360ce86c7SWei Liu ret |= O_TRUNC; 9460ce86c7SWei Liu } 9560ce86c7SWei Liu 9660ce86c7SWei Liu if (mode & Oappend) { 9760ce86c7SWei Liu ret |= O_APPEND; 9860ce86c7SWei Liu } 9960ce86c7SWei Liu 10060ce86c7SWei Liu if (mode & Oexcl) { 10160ce86c7SWei Liu ret |= O_EXCL; 10260ce86c7SWei Liu } 10360ce86c7SWei Liu 10460ce86c7SWei Liu return ret; 10560ce86c7SWei Liu } 10660ce86c7SWei Liu 1078e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 10860ce86c7SWei Liu int dotl_flag; 10960ce86c7SWei Liu int open_flag; 1108e71b96cSGreg Kurz } DotlOpenflagMap; 11160ce86c7SWei Liu 11260ce86c7SWei Liu static int dotl_to_open_flags(int flags) 11360ce86c7SWei Liu { 11460ce86c7SWei Liu int i; 11560ce86c7SWei Liu /* 11660ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 11760ce86c7SWei Liu * and P9_DOTL_NOACCESS 11860ce86c7SWei Liu */ 11960ce86c7SWei Liu int oflags = flags & O_ACCMODE; 12060ce86c7SWei Liu 1218e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 12260ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 12360ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 12460ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 12560ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 12660ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 12760ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 12860ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 12960ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 13060ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 13160ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 13260ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 13360ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 13460ce86c7SWei Liu { P9_DOTL_NOATIME, O_NOATIME }, 13560ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 13660ce86c7SWei Liu }; 13760ce86c7SWei Liu 13860ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 13960ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 14060ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 14160ce86c7SWei Liu } 14260ce86c7SWei Liu } 14360ce86c7SWei Liu 14460ce86c7SWei Liu return oflags; 14560ce86c7SWei Liu } 14660ce86c7SWei Liu 14760ce86c7SWei Liu void cred_init(FsCred *credp) 14860ce86c7SWei Liu { 14960ce86c7SWei Liu credp->fc_uid = -1; 15060ce86c7SWei Liu credp->fc_gid = -1; 15160ce86c7SWei Liu credp->fc_mode = -1; 15260ce86c7SWei Liu credp->fc_rdev = -1; 15360ce86c7SWei Liu } 15460ce86c7SWei Liu 15560ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 15660ce86c7SWei Liu { 15760ce86c7SWei Liu int flags; 15860ce86c7SWei Liu /* 15960ce86c7SWei Liu * Filter the client open flags 16060ce86c7SWei Liu */ 16160ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 16260ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 16360ce86c7SWei Liu /* 16460ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 16560ce86c7SWei Liu */ 16660ce86c7SWei Liu flags &= ~O_DIRECT; 16760ce86c7SWei Liu return flags; 16860ce86c7SWei Liu } 16960ce86c7SWei Liu 17060ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 17160ce86c7SWei Liu { 17260ce86c7SWei Liu path->data = NULL; 17360ce86c7SWei Liu path->size = 0; 17460ce86c7SWei Liu } 17560ce86c7SWei Liu 17660ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 17760ce86c7SWei Liu { 17860ce86c7SWei Liu g_free(path->data); 17960ce86c7SWei Liu path->data = NULL; 18060ce86c7SWei Liu path->size = 0; 18160ce86c7SWei Liu } 18260ce86c7SWei Liu 183e3e83f2eSGreg Kurz 184e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 185e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 186e3e83f2eSGreg Kurz { 187e3e83f2eSGreg Kurz va_list ap; 188e3e83f2eSGreg Kurz 189e3e83f2eSGreg Kurz v9fs_path_free(path); 190e3e83f2eSGreg Kurz 191e3e83f2eSGreg Kurz va_start(ap, fmt); 192e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 193e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 194e3e83f2eSGreg Kurz va_end(ap); 195e3e83f2eSGreg Kurz } 196e3e83f2eSGreg Kurz 197e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 19860ce86c7SWei Liu { 199e446a1ebSMarc-André Lureau v9fs_path_free(dst); 200e446a1ebSMarc-André Lureau dst->size = src->size; 201e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 20260ce86c7SWei Liu } 20360ce86c7SWei Liu 20460ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 20560ce86c7SWei Liu const char *name, V9fsPath *path) 20660ce86c7SWei Liu { 20760ce86c7SWei Liu int err; 20860ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 20960ce86c7SWei Liu if (err < 0) { 21060ce86c7SWei Liu err = -errno; 21160ce86c7SWei Liu } 21260ce86c7SWei Liu return err; 21360ce86c7SWei Liu } 21460ce86c7SWei Liu 21560ce86c7SWei Liu /* 21660ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 21760ce86c7SWei Liu * 21860ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 21960ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 22060ce86c7SWei Liu */ 22160ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 22260ce86c7SWei Liu { 22360ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 22460ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 22560ce86c7SWei Liu return 1; 22660ce86c7SWei Liu } 22760ce86c7SWei Liu } 22860ce86c7SWei Liu return 0; 22960ce86c7SWei Liu } 23060ce86c7SWei Liu 23160ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 23260ce86c7SWei Liu { 23360ce86c7SWei Liu return str->size; 23460ce86c7SWei Liu } 23560ce86c7SWei Liu 23660ce86c7SWei Liu /* 23760ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2388440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 23960ce86c7SWei Liu { 24060ce86c7SWei Liu int err = 1; 24160ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 24260ce86c7SWei Liu if (f->fs.fd == -1) { 24360ce86c7SWei Liu do { 24460ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 24560ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 24660ce86c7SWei Liu } 24760ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 248f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 24960ce86c7SWei Liu do { 25060ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 25160ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25260ce86c7SWei Liu } 25360ce86c7SWei Liu } 25460ce86c7SWei Liu return err; 25560ce86c7SWei Liu } 25660ce86c7SWei Liu 2578440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 25860ce86c7SWei Liu { 25960ce86c7SWei Liu int err; 26060ce86c7SWei Liu V9fsFidState *f; 26160ce86c7SWei Liu V9fsState *s = pdu->s; 26260ce86c7SWei Liu 26360ce86c7SWei Liu for (f = s->fid_list; f; f = f->next) { 26460ce86c7SWei Liu BUG_ON(f->clunked); 26560ce86c7SWei Liu if (f->fid == fid) { 26660ce86c7SWei Liu /* 26760ce86c7SWei Liu * Update the fid ref upfront so that 26860ce86c7SWei Liu * we don't get reclaimed when we yield 26960ce86c7SWei Liu * in open later. 27060ce86c7SWei Liu */ 27160ce86c7SWei Liu f->ref++; 27260ce86c7SWei Liu /* 27360ce86c7SWei Liu * check whether we need to reopen the 27460ce86c7SWei Liu * file. We might have closed the fd 27560ce86c7SWei Liu * while trying to free up some file 27660ce86c7SWei Liu * descriptors. 27760ce86c7SWei Liu */ 27860ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 27960ce86c7SWei Liu if (err < 0) { 28060ce86c7SWei Liu f->ref--; 28160ce86c7SWei Liu return NULL; 28260ce86c7SWei Liu } 28360ce86c7SWei Liu /* 28460ce86c7SWei Liu * Mark the fid as referenced so that the LRU 28560ce86c7SWei Liu * reclaim won't close the file descriptor 28660ce86c7SWei Liu */ 28760ce86c7SWei Liu f->flags |= FID_REFERENCED; 28860ce86c7SWei Liu return f; 28960ce86c7SWei Liu } 29060ce86c7SWei Liu } 29160ce86c7SWei Liu return NULL; 29260ce86c7SWei Liu } 29360ce86c7SWei Liu 29460ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 29560ce86c7SWei Liu { 29660ce86c7SWei Liu V9fsFidState *f; 29760ce86c7SWei Liu 29860ce86c7SWei Liu for (f = s->fid_list; f; f = f->next) { 29960ce86c7SWei Liu /* If fid is already there return NULL */ 30060ce86c7SWei Liu BUG_ON(f->clunked); 30160ce86c7SWei Liu if (f->fid == fid) { 30260ce86c7SWei Liu return NULL; 30360ce86c7SWei Liu } 30460ce86c7SWei Liu } 30560ce86c7SWei Liu f = g_malloc0(sizeof(V9fsFidState)); 30660ce86c7SWei Liu f->fid = fid; 30760ce86c7SWei Liu f->fid_type = P9_FID_NONE; 30860ce86c7SWei Liu f->ref = 1; 30960ce86c7SWei Liu /* 31060ce86c7SWei Liu * Mark the fid as referenced so that the LRU 31160ce86c7SWei Liu * reclaim won't close the file descriptor 31260ce86c7SWei Liu */ 31360ce86c7SWei Liu f->flags |= FID_REFERENCED; 31460ce86c7SWei Liu f->next = s->fid_list; 31560ce86c7SWei Liu s->fid_list = f; 31660ce86c7SWei Liu 317d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 318d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3197cde47d4SGreg Kurz 32060ce86c7SWei Liu return f; 32160ce86c7SWei Liu } 32260ce86c7SWei Liu 3238440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 32460ce86c7SWei Liu { 32560ce86c7SWei Liu int retval = 0; 32660ce86c7SWei Liu 327dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 32860ce86c7SWei Liu /* getxattr/listxattr fid */ 32960ce86c7SWei Liu goto free_value; 33060ce86c7SWei Liu } 33160ce86c7SWei Liu /* 33260ce86c7SWei Liu * if this is fid for setxattr. clunk should 33360ce86c7SWei Liu * result in setxattr localcall 33460ce86c7SWei Liu */ 33560ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 33660ce86c7SWei Liu /* clunk after partial write */ 33760ce86c7SWei Liu retval = -EINVAL; 33860ce86c7SWei Liu goto free_out; 33960ce86c7SWei Liu } 34060ce86c7SWei Liu if (fidp->fs.xattr.len) { 34160ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 34260ce86c7SWei Liu fidp->fs.xattr.value, 34360ce86c7SWei Liu fidp->fs.xattr.len, 34460ce86c7SWei Liu fidp->fs.xattr.flags); 34560ce86c7SWei Liu } else { 34660ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 34760ce86c7SWei Liu } 34860ce86c7SWei Liu free_out: 34960ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 35060ce86c7SWei Liu free_value: 35160ce86c7SWei Liu g_free(fidp->fs.xattr.value); 35260ce86c7SWei Liu return retval; 35360ce86c7SWei Liu } 35460ce86c7SWei Liu 3558440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 35660ce86c7SWei Liu { 35760ce86c7SWei Liu int retval = 0; 35860ce86c7SWei Liu 35960ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 36060ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 36160ce86c7SWei Liu if (fidp->fs.fd != -1) { 36260ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 36360ce86c7SWei Liu } 36460ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 365f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 36660ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 36760ce86c7SWei Liu } 36860ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 36960ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 37060ce86c7SWei Liu } 37160ce86c7SWei Liu v9fs_path_free(&fidp->path); 37260ce86c7SWei Liu g_free(fidp); 37360ce86c7SWei Liu return retval; 37460ce86c7SWei Liu } 37560ce86c7SWei Liu 3768440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 37760ce86c7SWei Liu { 37860ce86c7SWei Liu BUG_ON(!fidp->ref); 37960ce86c7SWei Liu fidp->ref--; 38060ce86c7SWei Liu /* 38160ce86c7SWei Liu * Don't free the fid if it is in reclaim list 38260ce86c7SWei Liu */ 38360ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 38460ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 38560ce86c7SWei Liu /* 38660ce86c7SWei Liu * if the clunked fid is root fid then we 38760ce86c7SWei Liu * have unmounted the fs on the client side. 38860ce86c7SWei Liu * delete the migration blocker. Ideally, this 38960ce86c7SWei Liu * should be hooked to transport close notification 39060ce86c7SWei Liu */ 39160ce86c7SWei Liu if (pdu->s->migration_blocker) { 39260ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 39360ce86c7SWei Liu error_free(pdu->s->migration_blocker); 39460ce86c7SWei Liu pdu->s->migration_blocker = NULL; 39560ce86c7SWei Liu } 39660ce86c7SWei Liu } 39760ce86c7SWei Liu return free_fid(pdu, fidp); 39860ce86c7SWei Liu } 39960ce86c7SWei Liu return 0; 40060ce86c7SWei Liu } 40160ce86c7SWei Liu 40260ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 40360ce86c7SWei Liu { 40460ce86c7SWei Liu V9fsFidState **fidpp, *fidp; 40560ce86c7SWei Liu 40660ce86c7SWei Liu for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { 40760ce86c7SWei Liu if ((*fidpp)->fid == fid) { 40860ce86c7SWei Liu break; 40960ce86c7SWei Liu } 41060ce86c7SWei Liu } 41160ce86c7SWei Liu if (*fidpp == NULL) { 41260ce86c7SWei Liu return NULL; 41360ce86c7SWei Liu } 41460ce86c7SWei Liu fidp = *fidpp; 41560ce86c7SWei Liu *fidpp = fidp->next; 416*2e53160fSGreg Kurz fidp->clunked = true; 41760ce86c7SWei Liu return fidp; 41860ce86c7SWei Liu } 41960ce86c7SWei Liu 4208440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 42160ce86c7SWei Liu { 42260ce86c7SWei Liu int reclaim_count = 0; 42360ce86c7SWei Liu V9fsState *s = pdu->s; 42460ce86c7SWei Liu V9fsFidState *f, *reclaim_list = NULL; 42560ce86c7SWei Liu 42660ce86c7SWei Liu for (f = s->fid_list; f; f = f->next) { 42760ce86c7SWei Liu /* 42860ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 42960ce86c7SWei Liu * for them and skip them. Also skip fids 43060ce86c7SWei Liu * currently being operated on. 43160ce86c7SWei Liu */ 43260ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 43360ce86c7SWei Liu continue; 43460ce86c7SWei Liu } 43560ce86c7SWei Liu /* 43660ce86c7SWei Liu * if it is a recently referenced fid 43760ce86c7SWei Liu * we leave the fid untouched and clear the 43860ce86c7SWei Liu * reference bit. We come back to it later 43960ce86c7SWei Liu * in the next iteration. (a simple LRU without 44060ce86c7SWei Liu * moving list elements around) 44160ce86c7SWei Liu */ 44260ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 44360ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 44460ce86c7SWei Liu continue; 44560ce86c7SWei Liu } 44660ce86c7SWei Liu /* 44760ce86c7SWei Liu * Add fids to reclaim list. 44860ce86c7SWei Liu */ 44960ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 45060ce86c7SWei Liu if (f->fs.fd != -1) { 45160ce86c7SWei Liu /* 45260ce86c7SWei Liu * Up the reference count so that 45360ce86c7SWei Liu * a clunk request won't free this fid 45460ce86c7SWei Liu */ 45560ce86c7SWei Liu f->ref++; 45660ce86c7SWei Liu f->rclm_lst = reclaim_list; 45760ce86c7SWei Liu reclaim_list = f; 45860ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 45960ce86c7SWei Liu f->fs.fd = -1; 46060ce86c7SWei Liu reclaim_count++; 46160ce86c7SWei Liu } 46260ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 463f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 46460ce86c7SWei Liu /* 46560ce86c7SWei Liu * Up the reference count so that 46660ce86c7SWei Liu * a clunk request won't free this fid 46760ce86c7SWei Liu */ 46860ce86c7SWei Liu f->ref++; 46960ce86c7SWei Liu f->rclm_lst = reclaim_list; 47060ce86c7SWei Liu reclaim_list = f; 471f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 472f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 47360ce86c7SWei Liu reclaim_count++; 47460ce86c7SWei Liu } 47560ce86c7SWei Liu } 47660ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 47760ce86c7SWei Liu break; 47860ce86c7SWei Liu } 47960ce86c7SWei Liu } 48060ce86c7SWei Liu /* 48160ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 48260ce86c7SWei Liu * are already clunked. 48360ce86c7SWei Liu */ 48460ce86c7SWei Liu while (reclaim_list) { 48560ce86c7SWei Liu f = reclaim_list; 48660ce86c7SWei Liu reclaim_list = f->rclm_lst; 48760ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 48860ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 48960ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 49060ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 49160ce86c7SWei Liu } 49260ce86c7SWei Liu f->rclm_lst = NULL; 49360ce86c7SWei Liu /* 49460ce86c7SWei Liu * Now drop the fid reference, free it 49560ce86c7SWei Liu * if clunked. 49660ce86c7SWei Liu */ 49760ce86c7SWei Liu put_fid(pdu, f); 49860ce86c7SWei Liu } 49960ce86c7SWei Liu } 50060ce86c7SWei Liu 5018440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 50260ce86c7SWei Liu { 50360ce86c7SWei Liu int err; 50460ce86c7SWei Liu V9fsState *s = pdu->s; 50589fbea87SGreg Kurz V9fsFidState *fidp; 50660ce86c7SWei Liu 50789fbea87SGreg Kurz again: 50860ce86c7SWei Liu for (fidp = s->fid_list; fidp; fidp = fidp->next) { 50960ce86c7SWei Liu if (fidp->path.size != path->size) { 51060ce86c7SWei Liu continue; 51160ce86c7SWei Liu } 51260ce86c7SWei Liu if (!memcmp(fidp->path.data, path->data, path->size)) { 51360ce86c7SWei Liu /* Mark the fid non reclaimable. */ 51460ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 51560ce86c7SWei Liu 51660ce86c7SWei Liu /* reopen the file/dir if already closed */ 51760ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 51860ce86c7SWei Liu if (err < 0) { 519267fcadfSGreg Kurz return err; 52060ce86c7SWei Liu } 52160ce86c7SWei Liu /* 52260ce86c7SWei Liu * Go back to head of fid list because 52360ce86c7SWei Liu * the list could have got updated when 52460ce86c7SWei Liu * switched to the worker thread 52560ce86c7SWei Liu */ 52660ce86c7SWei Liu if (err == 0) { 52789fbea87SGreg Kurz goto again; 52860ce86c7SWei Liu } 52960ce86c7SWei Liu } 53060ce86c7SWei Liu } 53160ce86c7SWei Liu return 0; 53260ce86c7SWei Liu } 53360ce86c7SWei Liu 5348440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 53560ce86c7SWei Liu { 53660ce86c7SWei Liu V9fsState *s = pdu->s; 53779decce3SGreg Kurz V9fsFidState *fidp; 53860ce86c7SWei Liu 53960ce86c7SWei Liu /* Free all fids */ 54060ce86c7SWei Liu while (s->fid_list) { 5416d54af0eSGreg Kurz /* Get fid */ 54260ce86c7SWei Liu fidp = s->fid_list; 5436d54af0eSGreg Kurz fidp->ref++; 54460ce86c7SWei Liu 5456d54af0eSGreg Kurz /* Clunk fid */ 5466d54af0eSGreg Kurz s->fid_list = fidp->next; 547*2e53160fSGreg Kurz fidp->clunked = true; 5486d54af0eSGreg Kurz 5496d54af0eSGreg Kurz put_fid(pdu, fidp); 55060ce86c7SWei Liu } 55160ce86c7SWei Liu } 55260ce86c7SWei Liu 55360ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 55460ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 55560ce86c7SWei Liu 55660ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 55760ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 55860ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 55960ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 56060ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 56160ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 56260ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 56360ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 56460ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 56560ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 56660ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 56760ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 56860ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 56960ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 57060ce86c7SWei Liu 57160ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 57260ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 57360ce86c7SWei Liu P9_STAT_MODE_LINK | \ 57460ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 57560ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 57660ce86c7SWei Liu P9_STAT_MODE_SOCKET) 57760ce86c7SWei Liu 5786b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 5796b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 5806b6aa828SChristian Schoenebeck { 5816b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 5826b6aa828SChristian Schoenebeck } 5836b6aa828SChristian Schoenebeck 5846b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 5856b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 5866b6aa828SChristian Schoenebeck { 5876b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 5886b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 5896b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 5906b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 5916b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 5926b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 5936b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 5946b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 5956b6aa828SChristian Schoenebeck } 5966b6aa828SChristian Schoenebeck 5976b6aa828SChristian Schoenebeck /** 5986b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 5996b6aa828SChristian Schoenebeck * 6006b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6016b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6026b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6036b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6046b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6056b6aa828SChristian Schoenebeck * 6066b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6076b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6086b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6096b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6106b6aa828SChristian Schoenebeck * 6116b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6126b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6136b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6146b6aa828SChristian Schoenebeck */ 6156b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6166b6aa828SChristian Schoenebeck 6176b6aa828SChristian Schoenebeck /** 6186b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6196b6aa828SChristian Schoenebeck * 6206b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6216b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6226b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6236b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6246b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6256b6aa828SChristian Schoenebeck * 6266b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6276b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6286b6aa828SChristian Schoenebeck * 6296b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6306b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6316b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6326b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6336b6aa828SChristian Schoenebeck */ 6346b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6356b6aa828SChristian Schoenebeck { 6366b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6376b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6386b6aa828SChristian Schoenebeck return (VariLenAffix) { 6396b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6406b6aa828SChristian Schoenebeck .value = value, 6416b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6426b6aa828SChristian Schoenebeck }; 6436b6aa828SChristian Schoenebeck } 6446b6aa828SChristian Schoenebeck 6456b6aa828SChristian Schoenebeck /** 6466b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6476b6aa828SChristian Schoenebeck * 6486b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6496b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6506b6aa828SChristian Schoenebeck * after the conversion. 6516b6aa828SChristian Schoenebeck * 6526b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6536b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6546b6aa828SChristian Schoenebeck * versa). 6556b6aa828SChristian Schoenebeck */ 6566b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6576b6aa828SChristian Schoenebeck { 6586b6aa828SChristian Schoenebeck return (VariLenAffix) { 6596b6aa828SChristian Schoenebeck .type = 6606b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6616b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6626b6aa828SChristian Schoenebeck .value = 6636b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6646b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6656b6aa828SChristian Schoenebeck .bits = affix->bits 6666b6aa828SChristian Schoenebeck }; 6676b6aa828SChristian Schoenebeck } 6686b6aa828SChristian Schoenebeck 6696b6aa828SChristian Schoenebeck /** 6706b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6716b6aa828SChristian Schoenebeck * 6726b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6736b6aa828SChristian Schoenebeck * 6746b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6756b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6766b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 6776b6aa828SChristian Schoenebeck * 6786b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 6796b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6806b6aa828SChristian Schoenebeck */ 6816b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 6826b6aa828SChristian Schoenebeck { 6836b6aa828SChristian Schoenebeck VariLenAffix prefix; 6846b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 6856b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 6866b6aa828SChristian Schoenebeck } 6876b6aa828SChristian Schoenebeck 6881a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 6891a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 6901a6ed33cSAntonios Motakis { 6911a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 6921a6ed33cSAntonios Motakis } 6931a6ed33cSAntonios Motakis 694f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 695f3fe4a2dSAntonios Motakis { 696f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 697f3fe4a2dSAntonios Motakis } 698f3fe4a2dSAntonios Motakis 6996b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7006b6aa828SChristian Schoenebeck { 7016b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7026b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7036b6aa828SChristian Schoenebeck } 7046b6aa828SChristian Schoenebeck 7056b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7061a6ed33cSAntonios Motakis { 7071a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7081a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7091a6ed33cSAntonios Motakis } 7101a6ed33cSAntonios Motakis 7116b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 712f3fe4a2dSAntonios Motakis { 713f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 714f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 715f3fe4a2dSAntonios Motakis } 716f3fe4a2dSAntonios Motakis 717f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7181a6ed33cSAntonios Motakis { 7191a6ed33cSAntonios Motakis g_free(p); 7201a6ed33cSAntonios Motakis } 7211a6ed33cSAntonios Motakis 722f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7231a6ed33cSAntonios Motakis { 7241a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7251a6ed33cSAntonios Motakis return; 7261a6ed33cSAntonios Motakis } 727f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7281a6ed33cSAntonios Motakis qht_destroy(ht); 7291a6ed33cSAntonios Motakis } 7301a6ed33cSAntonios Motakis 7316b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7326b6aa828SChristian Schoenebeck { 7336b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7346b6aa828SChristian Schoenebeck } 7356b6aa828SChristian Schoenebeck 7361a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7371a6ed33cSAntonios Motakis { 7386b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7391a6ed33cSAntonios Motakis } 7401a6ed33cSAntonios Motakis 741f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 742f3fe4a2dSAntonios Motakis { 7436b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 744f3fe4a2dSAntonios Motakis } 745f3fe4a2dSAntonios Motakis 7466b6aa828SChristian Schoenebeck /* 7476b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7486b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7496b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7506b6aa828SChristian Schoenebeck * 7516b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7526b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7536b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7546b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7556b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7566b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7576b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7586b6aa828SChristian Schoenebeck */ 7596b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7606b6aa828SChristian Schoenebeck { 7616b6aa828SChristian Schoenebeck QpdEntry lookup = { 7626b6aa828SChristian Schoenebeck .dev = dev 7636b6aa828SChristian Schoenebeck }, *val; 7646b6aa828SChristian Schoenebeck uint32_t hash = dev; 7656b6aa828SChristian Schoenebeck VariLenAffix affix; 7666b6aa828SChristian Schoenebeck 7676b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7686b6aa828SChristian Schoenebeck if (!val) { 7696b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7706b6aa828SChristian Schoenebeck *val = lookup; 7716b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7726b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7736b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7746b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7756b6aa828SChristian Schoenebeck } 7766b6aa828SChristian Schoenebeck return val->prefix_bits; 7776b6aa828SChristian Schoenebeck } 7786b6aa828SChristian Schoenebeck 7796b6aa828SChristian Schoenebeck /** 7806b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 7816b6aa828SChristian Schoenebeck * 7826b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 7836b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 7846b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 7856b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 7866b6aa828SChristian Schoenebeck * guest. 7876b6aa828SChristian Schoenebeck * 7886b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 7896b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 7906b6aa828SChristian Schoenebeck * expected ever to be used at all though. 7916b6aa828SChristian Schoenebeck * 7926b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 7936b6aa828SChristian Schoenebeck * 7946b6aa828SChristian Schoenebeck */ 795f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 796f3fe4a2dSAntonios Motakis uint64_t *path) 797f3fe4a2dSAntonios Motakis { 798f3fe4a2dSAntonios Motakis QpfEntry lookup = { 799f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 800f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 801f3fe4a2dSAntonios Motakis }, *val; 802f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8036b6aa828SChristian Schoenebeck VariLenAffix affix; 804f3fe4a2dSAntonios Motakis 805f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 806f3fe4a2dSAntonios Motakis 807f3fe4a2dSAntonios Motakis if (!val) { 808f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 809f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 810f3fe4a2dSAntonios Motakis error_report_once( 811f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 812f3fe4a2dSAntonios Motakis "host to guest." 813f3fe4a2dSAntonios Motakis ); 814f3fe4a2dSAntonios Motakis return -ENFILE; 815f3fe4a2dSAntonios Motakis } 816f3fe4a2dSAntonios Motakis 817f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 818f3fe4a2dSAntonios Motakis *val = lookup; 819f3fe4a2dSAntonios Motakis 820f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8216b6aa828SChristian Schoenebeck affix = affixForIndex( 8226b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8236b6aa828SChristian Schoenebeck ); 8246b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8256b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 826f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 827f3fe4a2dSAntonios Motakis } 828f3fe4a2dSAntonios Motakis 829f3fe4a2dSAntonios Motakis *path = val->path; 830f3fe4a2dSAntonios Motakis return 0; 831f3fe4a2dSAntonios Motakis } 832f3fe4a2dSAntonios Motakis 8336b6aa828SChristian Schoenebeck /** 8346b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8351a6ed33cSAntonios Motakis * 8366b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8376b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8386b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8396b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8406b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8416b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8426b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8436b6aa828SChristian Schoenebeck * that is). 8446b6aa828SChristian Schoenebeck * 8456b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8466b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8476b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8486b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8496b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8506b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8516b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8526b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8536b6aa828SChristian Schoenebeck * 8546b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8556b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8566b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8576b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8586b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8596b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8606b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8616b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8626b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8636b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8646b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8656b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8666b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8676b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8686b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8696b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8706b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8711a6ed33cSAntonios Motakis */ 8726b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8731a6ed33cSAntonios Motakis uint64_t *path) 8741a6ed33cSAntonios Motakis { 8756b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8761a6ed33cSAntonios Motakis QppEntry lookup = { 8771a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 8786b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 8791a6ed33cSAntonios Motakis }, *val; 8801a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 8811a6ed33cSAntonios Motakis 8821a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 8831a6ed33cSAntonios Motakis 8841a6ed33cSAntonios Motakis if (!val) { 8856b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 8866b6aa828SChristian Schoenebeck /* we ran out of affixes */ 887f3fe4a2dSAntonios Motakis warn_report_once( 888f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 8891a6ed33cSAntonios Motakis ); 8901a6ed33cSAntonios Motakis return -ENFILE; 8911a6ed33cSAntonios Motakis } 8921a6ed33cSAntonios Motakis 8931a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 8941a6ed33cSAntonios Motakis *val = lookup; 8951a6ed33cSAntonios Motakis 8966b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 8976b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 8986b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 8991a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9001a6ed33cSAntonios Motakis } 9016b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9026b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9031a6ed33cSAntonios Motakis return 0; 9041a6ed33cSAntonios Motakis } 9051a6ed33cSAntonios Motakis 9063b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 90760ce86c7SWei Liu { 9081a6ed33cSAntonios Motakis int err; 90960ce86c7SWei Liu size_t size; 91060ce86c7SWei Liu 9111a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9121a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9136b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 914f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 915f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 916f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 917f3fe4a2dSAntonios Motakis } 9181a6ed33cSAntonios Motakis if (err) { 9191a6ed33cSAntonios Motakis return err; 9201a6ed33cSAntonios Motakis } 9211a6ed33cSAntonios Motakis } else { 9223b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9231a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9241a6ed33cSAntonios Motakis error_report_once( 9251a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9261a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9271a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9281a6ed33cSAntonios Motakis "effective." 9291a6ed33cSAntonios Motakis ); 9301a6ed33cSAntonios Motakis return -ENODEV; 9311a6ed33cSAntonios Motakis } else { 9323b5ee9e8SAntonios Motakis warn_report_once( 9333b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9343b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9351a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9361a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9371a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9383b5ee9e8SAntonios Motakis ); 9393b5ee9e8SAntonios Motakis } 9401a6ed33cSAntonios Motakis } 94160ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 94260ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 94360ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9441a6ed33cSAntonios Motakis } 9451a6ed33cSAntonios Motakis 94660ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 94760ce86c7SWei Liu qidp->type = 0; 94860ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 94960ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 95060ce86c7SWei Liu } 95160ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 95260ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 95360ce86c7SWei Liu } 9543b5ee9e8SAntonios Motakis 9553b5ee9e8SAntonios Motakis return 0; 95660ce86c7SWei Liu } 95760ce86c7SWei Liu 9588440e22eSGreg Kurz static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, 9598440e22eSGreg Kurz V9fsQID *qidp) 96060ce86c7SWei Liu { 96160ce86c7SWei Liu struct stat stbuf; 96260ce86c7SWei Liu int err; 96360ce86c7SWei Liu 96460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 96560ce86c7SWei Liu if (err < 0) { 96660ce86c7SWei Liu return err; 96760ce86c7SWei Liu } 9683b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, qidp); 9693b5ee9e8SAntonios Motakis if (err < 0) { 9703b5ee9e8SAntonios Motakis return err; 9713b5ee9e8SAntonios Motakis } 97260ce86c7SWei Liu return 0; 97360ce86c7SWei Liu } 97460ce86c7SWei Liu 97560ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 97660ce86c7SWei Liu { 97760ce86c7SWei Liu V9fsPDU *pdu = NULL; 97860ce86c7SWei Liu 97960ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 98060ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 98160ce86c7SWei Liu QLIST_REMOVE(pdu, next); 98260ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 98360ce86c7SWei Liu } 98460ce86c7SWei Liu return pdu; 98560ce86c7SWei Liu } 98660ce86c7SWei Liu 98760ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 98860ce86c7SWei Liu { 98960ce86c7SWei Liu V9fsState *s = pdu->s; 990f74e27bfSGreg Kurz 991f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 99260ce86c7SWei Liu QLIST_REMOVE(pdu, next); 99360ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 99460ce86c7SWei Liu } 99560ce86c7SWei Liu 9968440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 99760ce86c7SWei Liu { 99860ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 99960ce86c7SWei Liu V9fsState *s = pdu->s; 100006a37db7SGreg Kurz int ret; 100160ce86c7SWei Liu 1002fc78d5eeSKeno Fischer /* 1003fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1004fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1005fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1006fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1007fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1008fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1009fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1010fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1011fc78d5eeSKeno Fischer * transmission of the reply. 1012fc78d5eeSKeno Fischer */ 1013fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1014fc78d5eeSKeno Fischer if (discard) { 1015fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1016fc78d5eeSKeno Fischer pdu->size = 0; 1017fc78d5eeSKeno Fischer goto out_notify; 1018fc78d5eeSKeno Fischer } 1019fc78d5eeSKeno Fischer 102060ce86c7SWei Liu if (len < 0) { 102160ce86c7SWei Liu int err = -len; 102260ce86c7SWei Liu len = 7; 102360ce86c7SWei Liu 102460ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 102560ce86c7SWei Liu V9fsString str; 102660ce86c7SWei Liu 102760ce86c7SWei Liu str.data = strerror(err); 102860ce86c7SWei Liu str.size = strlen(str.data); 102960ce86c7SWei Liu 103006a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 103106a37db7SGreg Kurz if (ret < 0) { 103206a37db7SGreg Kurz goto out_notify; 103306a37db7SGreg Kurz } 103406a37db7SGreg Kurz len += ret; 103560ce86c7SWei Liu id = P9_RERROR; 103660ce86c7SWei Liu } 103760ce86c7SWei Liu 103806a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 103906a37db7SGreg Kurz if (ret < 0) { 104006a37db7SGreg Kurz goto out_notify; 104106a37db7SGreg Kurz } 104206a37db7SGreg Kurz len += ret; 104360ce86c7SWei Liu 104460ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 104560ce86c7SWei Liu id = P9_RLERROR; 104660ce86c7SWei Liu } 104760ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 104860ce86c7SWei Liu } 104960ce86c7SWei Liu 105060ce86c7SWei Liu /* fill out the header */ 105106a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 105206a37db7SGreg Kurz goto out_notify; 105306a37db7SGreg Kurz } 105460ce86c7SWei Liu 105560ce86c7SWei Liu /* keep these in sync */ 105660ce86c7SWei Liu pdu->size = len; 105760ce86c7SWei Liu pdu->id = id; 105860ce86c7SWei Liu 105906a37db7SGreg Kurz out_notify: 1060a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 106160ce86c7SWei Liu 106260ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1063f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 106460ce86c7SWei Liu pdu_free(pdu); 106560ce86c7SWei Liu } 1066f74e27bfSGreg Kurz } 106760ce86c7SWei Liu 106860ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 106960ce86c7SWei Liu { 107060ce86c7SWei Liu mode_t ret; 107160ce86c7SWei Liu 107260ce86c7SWei Liu ret = mode & 0777; 107360ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 107460ce86c7SWei Liu ret |= S_IFDIR; 107560ce86c7SWei Liu } 107660ce86c7SWei Liu 107760ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 107860ce86c7SWei Liu ret |= S_IFLNK; 107960ce86c7SWei Liu } 108060ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 108160ce86c7SWei Liu ret |= S_IFSOCK; 108260ce86c7SWei Liu } 108360ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 108460ce86c7SWei Liu ret |= S_IFIFO; 108560ce86c7SWei Liu } 108660ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 108760ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 108860ce86c7SWei Liu ret |= S_IFCHR; 108960ce86c7SWei Liu } else { 109060ce86c7SWei Liu ret |= S_IFBLK; 109160ce86c7SWei Liu } 109260ce86c7SWei Liu } 109360ce86c7SWei Liu 109460ce86c7SWei Liu if (!(ret & ~0777)) { 109560ce86c7SWei Liu ret |= S_IFREG; 109660ce86c7SWei Liu } 109760ce86c7SWei Liu 109860ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 109960ce86c7SWei Liu ret |= S_ISUID; 110060ce86c7SWei Liu } 110160ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 110260ce86c7SWei Liu ret |= S_ISGID; 110360ce86c7SWei Liu } 110460ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 110560ce86c7SWei Liu ret |= S_ISVTX; 110660ce86c7SWei Liu } 110760ce86c7SWei Liu 110860ce86c7SWei Liu return ret; 110960ce86c7SWei Liu } 111060ce86c7SWei Liu 111160ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 111260ce86c7SWei Liu { 111360ce86c7SWei Liu if (stat->type == -1 && 111460ce86c7SWei Liu stat->dev == -1 && 111587032833SAntonios Motakis stat->qid.type == 0xff && 111687032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 111787032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 111860ce86c7SWei Liu stat->mode == -1 && 111960ce86c7SWei Liu stat->atime == -1 && 112060ce86c7SWei Liu stat->mtime == -1 && 112160ce86c7SWei Liu stat->length == -1 && 112260ce86c7SWei Liu !stat->name.size && 112360ce86c7SWei Liu !stat->uid.size && 112460ce86c7SWei Liu !stat->gid.size && 112560ce86c7SWei Liu !stat->muid.size && 112660ce86c7SWei Liu stat->n_uid == -1 && 112760ce86c7SWei Liu stat->n_gid == -1 && 112860ce86c7SWei Liu stat->n_muid == -1) { 112960ce86c7SWei Liu return 1; 113060ce86c7SWei Liu } 113160ce86c7SWei Liu 113260ce86c7SWei Liu return 0; 113360ce86c7SWei Liu } 113460ce86c7SWei Liu 113560ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 113660ce86c7SWei Liu { 113760ce86c7SWei Liu v9fs_string_init(&stat->name); 113860ce86c7SWei Liu v9fs_string_init(&stat->uid); 113960ce86c7SWei Liu v9fs_string_init(&stat->gid); 114060ce86c7SWei Liu v9fs_string_init(&stat->muid); 114160ce86c7SWei Liu v9fs_string_init(&stat->extension); 114260ce86c7SWei Liu } 114360ce86c7SWei Liu 114460ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 114560ce86c7SWei Liu { 114660ce86c7SWei Liu v9fs_string_free(&stat->name); 114760ce86c7SWei Liu v9fs_string_free(&stat->uid); 114860ce86c7SWei Liu v9fs_string_free(&stat->gid); 114960ce86c7SWei Liu v9fs_string_free(&stat->muid); 115060ce86c7SWei Liu v9fs_string_free(&stat->extension); 115160ce86c7SWei Liu } 115260ce86c7SWei Liu 115360ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 115460ce86c7SWei Liu { 115560ce86c7SWei Liu uint32_t mode; 115660ce86c7SWei Liu 115760ce86c7SWei Liu mode = stbuf->st_mode & 0777; 115860ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 115960ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 116060ce86c7SWei Liu } 116160ce86c7SWei Liu 116260ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 116360ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 116460ce86c7SWei Liu } 116560ce86c7SWei Liu 116660ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 116760ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 116860ce86c7SWei Liu } 116960ce86c7SWei Liu 117060ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 117160ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 117260ce86c7SWei Liu } 117360ce86c7SWei Liu 117460ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 117560ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 117660ce86c7SWei Liu } 117760ce86c7SWei Liu 117860ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 117960ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 118060ce86c7SWei Liu } 118160ce86c7SWei Liu 118260ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 118360ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 118460ce86c7SWei Liu } 118560ce86c7SWei Liu 118660ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 118760ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 118860ce86c7SWei Liu } 118960ce86c7SWei Liu 119060ce86c7SWei Liu return mode; 119160ce86c7SWei Liu } 119260ce86c7SWei Liu 11936069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 11946069537fSJan Dakinevich const char *basename, 119560ce86c7SWei Liu const struct stat *stbuf, 119660ce86c7SWei Liu V9fsStat *v9stat) 119760ce86c7SWei Liu { 119860ce86c7SWei Liu int err; 119960ce86c7SWei Liu 120060ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 120160ce86c7SWei Liu 12023b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12033b5ee9e8SAntonios Motakis if (err < 0) { 12043b5ee9e8SAntonios Motakis return err; 12053b5ee9e8SAntonios Motakis } 120660ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 120760ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 120860ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 120960ce86c7SWei Liu v9stat->length = stbuf->st_size; 121060ce86c7SWei Liu 1211abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1212abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1213abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 121460ce86c7SWei Liu 121560ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 121660ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 121760ce86c7SWei Liu v9stat->n_muid = 0; 121860ce86c7SWei Liu 1219abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 122060ce86c7SWei Liu 122160ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12226069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 122360ce86c7SWei Liu if (err < 0) { 122460ce86c7SWei Liu return err; 122560ce86c7SWei Liu } 122660ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 122760ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 122860ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 122960ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 123060ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 123160ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 123260ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 123360ce86c7SWei Liu } 123460ce86c7SWei Liu 12356069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 123660ce86c7SWei Liu 123760ce86c7SWei Liu v9stat->size = 61 + 123860ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 123960ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 124060ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 124160ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 124260ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 124360ce86c7SWei Liu return 0; 124460ce86c7SWei Liu } 124560ce86c7SWei Liu 124660ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 124760ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 124860ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 124960ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 125060ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 125160ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 125260ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 125360ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 125460ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 125560ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 125660ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 125760ce86c7SWei Liu 125860ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 125960ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 126060ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 126160ce86c7SWei Liu 126260ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 126360ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 126460ce86c7SWei Liu 126560ce86c7SWei Liu 12663b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 126760ce86c7SWei Liu V9fsStatDotl *v9lstat) 126860ce86c7SWei Liu { 126960ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 127060ce86c7SWei Liu 127160ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 127260ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 127360ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 127460ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 127560ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 127660ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 127760ce86c7SWei Liu v9lstat->st_blksize = stbuf->st_blksize; 127860ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 127960ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 128060ce86c7SWei Liu v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 128160ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 128260ce86c7SWei Liu v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 128360ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 128460ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 128560ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 128660ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 128760ce86c7SWei Liu 12883b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 128960ce86c7SWei Liu } 129060ce86c7SWei Liu 129160ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 129260ce86c7SWei Liu { 129360ce86c7SWei Liu int i; 129460ce86c7SWei Liu 129560ce86c7SWei Liu printf("sg[%d]: {", cnt); 129660ce86c7SWei Liu for (i = 0; i < cnt; i++) { 129760ce86c7SWei Liu if (i) { 129860ce86c7SWei Liu printf(", "); 129960ce86c7SWei Liu } 130060ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 130160ce86c7SWei Liu } 130260ce86c7SWei Liu printf("}\n"); 130360ce86c7SWei Liu } 130460ce86c7SWei Liu 130560ce86c7SWei Liu /* Will call this only for path name based fid */ 130660ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 130760ce86c7SWei Liu { 130860ce86c7SWei Liu V9fsPath str; 130960ce86c7SWei Liu v9fs_path_init(&str); 131060ce86c7SWei Liu v9fs_path_copy(&str, dst); 1311e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 131260ce86c7SWei Liu v9fs_path_free(&str); 131360ce86c7SWei Liu } 131460ce86c7SWei Liu 131560ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 131660ce86c7SWei Liu { 131760ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 131860ce86c7SWei Liu } 131960ce86c7SWei Liu 13208440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 132160ce86c7SWei Liu { 132260ce86c7SWei Liu ssize_t err; 132360ce86c7SWei Liu V9fsPDU *pdu = opaque; 132460ce86c7SWei Liu V9fsState *s = pdu->s; 132560ce86c7SWei Liu V9fsString version; 132660ce86c7SWei Liu size_t offset = 7; 132760ce86c7SWei Liu 132860ce86c7SWei Liu v9fs_string_init(&version); 132960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 133060ce86c7SWei Liu if (err < 0) { 133160ce86c7SWei Liu goto out; 133260ce86c7SWei Liu } 133360ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 133460ce86c7SWei Liu 133560ce86c7SWei Liu virtfs_reset(pdu); 133660ce86c7SWei Liu 133760ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 133860ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 133960ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 134060ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 134160ce86c7SWei Liu } else { 134260ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1343e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1344e16453a3SChristian Schoenebeck goto marshal; 134560ce86c7SWei Liu } 134660ce86c7SWei Liu 1347e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1348e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1349e16453a3SChristian Schoenebeck error_report( 1350e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1351e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1352e16453a3SChristian Schoenebeck ); 1353e16453a3SChristian Schoenebeck goto out; 1354e16453a3SChristian Schoenebeck } 1355e16453a3SChristian Schoenebeck 135662777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1357c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 135862777d82SChristian Schoenebeck warn_report_once( 135962777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 136062777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 136162777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 136262777d82SChristian Schoenebeck ); 136362777d82SChristian Schoenebeck } 136462777d82SChristian Schoenebeck 1365e16453a3SChristian Schoenebeck marshal: 136660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 136760ce86c7SWei Liu if (err < 0) { 136860ce86c7SWei Liu goto out; 136960ce86c7SWei Liu } 1370403a905bSPhilippe Mathieu-Daudé err += offset; 137160ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 137260ce86c7SWei Liu out: 1373403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 137460ce86c7SWei Liu v9fs_string_free(&version); 137560ce86c7SWei Liu } 137660ce86c7SWei Liu 13778440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 137860ce86c7SWei Liu { 137960ce86c7SWei Liu V9fsPDU *pdu = opaque; 138060ce86c7SWei Liu V9fsState *s = pdu->s; 138160ce86c7SWei Liu int32_t fid, afid, n_uname; 138260ce86c7SWei Liu V9fsString uname, aname; 138360ce86c7SWei Liu V9fsFidState *fidp; 138460ce86c7SWei Liu size_t offset = 7; 138560ce86c7SWei Liu V9fsQID qid; 138660ce86c7SWei Liu ssize_t err; 138760ce86c7SWei Liu 138860ce86c7SWei Liu v9fs_string_init(&uname); 138960ce86c7SWei Liu v9fs_string_init(&aname); 139060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 139160ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 139260ce86c7SWei Liu if (err < 0) { 139360ce86c7SWei Liu goto out_nofid; 139460ce86c7SWei Liu } 139560ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 139660ce86c7SWei Liu 139760ce86c7SWei Liu fidp = alloc_fid(s, fid); 139860ce86c7SWei Liu if (fidp == NULL) { 139960ce86c7SWei Liu err = -EINVAL; 140060ce86c7SWei Liu goto out_nofid; 140160ce86c7SWei Liu } 140260ce86c7SWei Liu fidp->uid = n_uname; 140360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 140460ce86c7SWei Liu if (err < 0) { 140560ce86c7SWei Liu err = -EINVAL; 140660ce86c7SWei Liu clunk_fid(s, fid); 140760ce86c7SWei Liu goto out; 140860ce86c7SWei Liu } 140960ce86c7SWei Liu err = fid_to_qid(pdu, fidp, &qid); 141060ce86c7SWei Liu if (err < 0) { 141160ce86c7SWei Liu err = -EINVAL; 141260ce86c7SWei Liu clunk_fid(s, fid); 141360ce86c7SWei Liu goto out; 141460ce86c7SWei Liu } 1415fe44dc91SAshijeet Acharya 1416fe44dc91SAshijeet Acharya /* 1417fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1418fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1419fe44dc91SAshijeet Acharya */ 1420fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1421fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1422fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1423fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14249261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14259261ef5eSMarkus Armbruster if (err < 0) { 1426fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1427fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1428fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1429fe44dc91SAshijeet Acharya goto out; 1430fe44dc91SAshijeet Acharya } 1431fe44dc91SAshijeet Acharya s->root_fid = fid; 1432fe44dc91SAshijeet Acharya } 1433fe44dc91SAshijeet Acharya 143460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 143560ce86c7SWei Liu if (err < 0) { 143660ce86c7SWei Liu clunk_fid(s, fid); 143760ce86c7SWei Liu goto out; 143860ce86c7SWei Liu } 143960ce86c7SWei Liu err += offset; 1440fe44dc91SAshijeet Acharya 144156f101ecSGreg Kurz memcpy(&s->root_qid, &qid, sizeof(qid)); 144260ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 144360ce86c7SWei Liu qid.type, qid.version, qid.path); 144460ce86c7SWei Liu out: 144560ce86c7SWei Liu put_fid(pdu, fidp); 144660ce86c7SWei Liu out_nofid: 144760ce86c7SWei Liu pdu_complete(pdu, err); 144860ce86c7SWei Liu v9fs_string_free(&uname); 144960ce86c7SWei Liu v9fs_string_free(&aname); 145060ce86c7SWei Liu } 145160ce86c7SWei Liu 14528440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 145360ce86c7SWei Liu { 145460ce86c7SWei Liu int32_t fid; 145560ce86c7SWei Liu V9fsStat v9stat; 145660ce86c7SWei Liu ssize_t err = 0; 145760ce86c7SWei Liu size_t offset = 7; 145860ce86c7SWei Liu struct stat stbuf; 145960ce86c7SWei Liu V9fsFidState *fidp; 146060ce86c7SWei Liu V9fsPDU *pdu = opaque; 14616069537fSJan Dakinevich char *basename; 146260ce86c7SWei Liu 146360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 146460ce86c7SWei Liu if (err < 0) { 146560ce86c7SWei Liu goto out_nofid; 146660ce86c7SWei Liu } 146760ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 146860ce86c7SWei Liu 146960ce86c7SWei Liu fidp = get_fid(pdu, fid); 147060ce86c7SWei Liu if (fidp == NULL) { 147160ce86c7SWei Liu err = -ENOENT; 147260ce86c7SWei Liu goto out_nofid; 147360ce86c7SWei Liu } 147460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 147560ce86c7SWei Liu if (err < 0) { 147660ce86c7SWei Liu goto out; 147760ce86c7SWei Liu } 14786069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 14796069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 14806069537fSJan Dakinevich g_free(basename); 148160ce86c7SWei Liu if (err < 0) { 148260ce86c7SWei Liu goto out; 148360ce86c7SWei Liu } 148460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 148560ce86c7SWei Liu if (err < 0) { 148660ce86c7SWei Liu v9fs_stat_free(&v9stat); 148760ce86c7SWei Liu goto out; 148860ce86c7SWei Liu } 148960ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 149060ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 149160ce86c7SWei Liu err += offset; 149260ce86c7SWei Liu v9fs_stat_free(&v9stat); 149360ce86c7SWei Liu out: 149460ce86c7SWei Liu put_fid(pdu, fidp); 149560ce86c7SWei Liu out_nofid: 149660ce86c7SWei Liu pdu_complete(pdu, err); 149760ce86c7SWei Liu } 149860ce86c7SWei Liu 14998440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 150060ce86c7SWei Liu { 150160ce86c7SWei Liu int32_t fid; 150260ce86c7SWei Liu size_t offset = 7; 150360ce86c7SWei Liu ssize_t retval = 0; 150460ce86c7SWei Liu struct stat stbuf; 150560ce86c7SWei Liu V9fsFidState *fidp; 150660ce86c7SWei Liu uint64_t request_mask; 150760ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 150860ce86c7SWei Liu V9fsPDU *pdu = opaque; 150960ce86c7SWei Liu 151060ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 151160ce86c7SWei Liu if (retval < 0) { 151260ce86c7SWei Liu goto out_nofid; 151360ce86c7SWei Liu } 151460ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 151560ce86c7SWei Liu 151660ce86c7SWei Liu fidp = get_fid(pdu, fid); 151760ce86c7SWei Liu if (fidp == NULL) { 151860ce86c7SWei Liu retval = -ENOENT; 151960ce86c7SWei Liu goto out_nofid; 152060ce86c7SWei Liu } 152160ce86c7SWei Liu /* 152260ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 152360ce86c7SWei Liu * need to look at request_mask. 152460ce86c7SWei Liu */ 152560ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 152660ce86c7SWei Liu if (retval < 0) { 152760ce86c7SWei Liu goto out; 152860ce86c7SWei Liu } 15293b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15303b5ee9e8SAntonios Motakis if (retval < 0) { 15313b5ee9e8SAntonios Motakis goto out; 15323b5ee9e8SAntonios Motakis } 153360ce86c7SWei Liu 153460ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 153560ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 153660ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 153760ce86c7SWei Liu switch (retval) { 153860ce86c7SWei Liu case 0: 153960ce86c7SWei Liu /* we have valid st_gen: update result mask */ 154060ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 154160ce86c7SWei Liu break; 154260ce86c7SWei Liu case -EINTR: 154360ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 154460ce86c7SWei Liu goto out; 154560ce86c7SWei Liu default: 154660ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 154760ce86c7SWei Liu break; 154860ce86c7SWei Liu } 154960ce86c7SWei Liu } 155060ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 155160ce86c7SWei Liu if (retval < 0) { 155260ce86c7SWei Liu goto out; 155360ce86c7SWei Liu } 155460ce86c7SWei Liu retval += offset; 155560ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 155660ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 155760ce86c7SWei Liu v9stat_dotl.st_gid); 155860ce86c7SWei Liu out: 155960ce86c7SWei Liu put_fid(pdu, fidp); 156060ce86c7SWei Liu out_nofid: 156160ce86c7SWei Liu pdu_complete(pdu, retval); 156260ce86c7SWei Liu } 156360ce86c7SWei Liu 156460ce86c7SWei Liu /* Attribute flags */ 156560ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 156660ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 156760ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 156860ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 156960ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 157060ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 157160ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 157260ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 157360ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 157460ce86c7SWei Liu 157560ce86c7SWei Liu #define P9_ATTR_MASK 127 157660ce86c7SWei Liu 15778440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 157860ce86c7SWei Liu { 157960ce86c7SWei Liu int err = 0; 158060ce86c7SWei Liu int32_t fid; 158160ce86c7SWei Liu V9fsFidState *fidp; 158260ce86c7SWei Liu size_t offset = 7; 158360ce86c7SWei Liu V9fsIattr v9iattr; 158460ce86c7SWei Liu V9fsPDU *pdu = opaque; 158560ce86c7SWei Liu 158660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 158760ce86c7SWei Liu if (err < 0) { 158860ce86c7SWei Liu goto out_nofid; 158960ce86c7SWei Liu } 159060ce86c7SWei Liu 15918f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 15928f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 15938f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 15948f9c64bfSGreg Kurz 159560ce86c7SWei Liu fidp = get_fid(pdu, fid); 159660ce86c7SWei Liu if (fidp == NULL) { 159760ce86c7SWei Liu err = -EINVAL; 159860ce86c7SWei Liu goto out_nofid; 159960ce86c7SWei Liu } 160060ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 160160ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 160260ce86c7SWei Liu if (err < 0) { 160360ce86c7SWei Liu goto out; 160460ce86c7SWei Liu } 160560ce86c7SWei Liu } 160660ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 160760ce86c7SWei Liu struct timespec times[2]; 160860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 160960ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 161060ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 161160ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 161260ce86c7SWei Liu } else { 161360ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 161460ce86c7SWei Liu } 161560ce86c7SWei Liu } else { 161660ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 161760ce86c7SWei Liu } 161860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 161960ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 162060ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 162160ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 162260ce86c7SWei Liu } else { 162360ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 162460ce86c7SWei Liu } 162560ce86c7SWei Liu } else { 162660ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 162760ce86c7SWei Liu } 162860ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 162960ce86c7SWei Liu if (err < 0) { 163060ce86c7SWei Liu goto out; 163160ce86c7SWei Liu } 163260ce86c7SWei Liu } 163360ce86c7SWei Liu /* 163460ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 163560ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 163660ce86c7SWei Liu */ 163760ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 163860ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 163960ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 164060ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 164160ce86c7SWei Liu v9iattr.uid = -1; 164260ce86c7SWei Liu } 164360ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 164460ce86c7SWei Liu v9iattr.gid = -1; 164560ce86c7SWei Liu } 164660ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 164760ce86c7SWei Liu v9iattr.gid); 164860ce86c7SWei Liu if (err < 0) { 164960ce86c7SWei Liu goto out; 165060ce86c7SWei Liu } 165160ce86c7SWei Liu } 165260ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 165360ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 165460ce86c7SWei Liu if (err < 0) { 165560ce86c7SWei Liu goto out; 165660ce86c7SWei Liu } 165760ce86c7SWei Liu } 165860ce86c7SWei Liu err = offset; 16598f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 166060ce86c7SWei Liu out: 166160ce86c7SWei Liu put_fid(pdu, fidp); 166260ce86c7SWei Liu out_nofid: 166360ce86c7SWei Liu pdu_complete(pdu, err); 166460ce86c7SWei Liu } 166560ce86c7SWei Liu 166660ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 166760ce86c7SWei Liu { 166860ce86c7SWei Liu int i; 166960ce86c7SWei Liu ssize_t err; 167060ce86c7SWei Liu size_t offset = 7; 167160ce86c7SWei Liu 167260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 167360ce86c7SWei Liu if (err < 0) { 167460ce86c7SWei Liu return err; 167560ce86c7SWei Liu } 167660ce86c7SWei Liu offset += err; 167760ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 167860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 167960ce86c7SWei Liu if (err < 0) { 168060ce86c7SWei Liu return err; 168160ce86c7SWei Liu } 168260ce86c7SWei Liu offset += err; 168360ce86c7SWei Liu } 168460ce86c7SWei Liu return offset; 168560ce86c7SWei Liu } 168660ce86c7SWei Liu 1687fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1688fff39a7aSGreg Kurz { 1689fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1690fff39a7aSGreg Kurz } 1691fff39a7aSGreg Kurz 169256f101ecSGreg Kurz static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) 169356f101ecSGreg Kurz { 169456f101ecSGreg Kurz return 169556f101ecSGreg Kurz qid1->type != qid2->type || 169656f101ecSGreg Kurz qid1->version != qid2->version || 169756f101ecSGreg Kurz qid1->path != qid2->path; 169856f101ecSGreg Kurz } 169956f101ecSGreg Kurz 17008440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 170160ce86c7SWei Liu { 170260ce86c7SWei Liu int name_idx; 170360ce86c7SWei Liu V9fsQID *qids = NULL; 170460ce86c7SWei Liu int i, err = 0; 170560ce86c7SWei Liu V9fsPath dpath, path; 170660ce86c7SWei Liu uint16_t nwnames; 170760ce86c7SWei Liu struct stat stbuf; 170860ce86c7SWei Liu size_t offset = 7; 170960ce86c7SWei Liu int32_t fid, newfid; 171060ce86c7SWei Liu V9fsString *wnames = NULL; 171160ce86c7SWei Liu V9fsFidState *fidp; 171260ce86c7SWei Liu V9fsFidState *newfidp = NULL; 171360ce86c7SWei Liu V9fsPDU *pdu = opaque; 171460ce86c7SWei Liu V9fsState *s = pdu->s; 171556f101ecSGreg Kurz V9fsQID qid; 171660ce86c7SWei Liu 171760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 171860ce86c7SWei Liu if (err < 0) { 171960ce86c7SWei Liu pdu_complete(pdu, err); 172060ce86c7SWei Liu return ; 172160ce86c7SWei Liu } 172260ce86c7SWei Liu offset += err; 172360ce86c7SWei Liu 172460ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 172560ce86c7SWei Liu 172660ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 17271923923bSGreg Kurz wnames = g_new0(V9fsString, nwnames); 17281923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 172960ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 173060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 173160ce86c7SWei Liu if (err < 0) { 173260ce86c7SWei Liu goto out_nofid; 173360ce86c7SWei Liu } 1734fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1735fff39a7aSGreg Kurz err = -ENOENT; 1736fff39a7aSGreg Kurz goto out_nofid; 1737fff39a7aSGreg Kurz } 173860ce86c7SWei Liu offset += err; 173960ce86c7SWei Liu } 174060ce86c7SWei Liu } else if (nwnames > P9_MAXWELEM) { 174160ce86c7SWei Liu err = -EINVAL; 174260ce86c7SWei Liu goto out_nofid; 174360ce86c7SWei Liu } 174460ce86c7SWei Liu fidp = get_fid(pdu, fid); 174560ce86c7SWei Liu if (fidp == NULL) { 174660ce86c7SWei Liu err = -ENOENT; 174760ce86c7SWei Liu goto out_nofid; 174860ce86c7SWei Liu } 174956f101ecSGreg Kurz 175013fd08e6SGreg Kurz v9fs_path_init(&dpath); 175113fd08e6SGreg Kurz v9fs_path_init(&path); 175213fd08e6SGreg Kurz 175356f101ecSGreg Kurz err = fid_to_qid(pdu, fidp, &qid); 175456f101ecSGreg Kurz if (err < 0) { 175556f101ecSGreg Kurz goto out; 175656f101ecSGreg Kurz } 175756f101ecSGreg Kurz 175860ce86c7SWei Liu /* 175960ce86c7SWei Liu * Both dpath and path initially poin to fidp. 176060ce86c7SWei Liu * Needed to handle request with nwnames == 0 176160ce86c7SWei Liu */ 176260ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 176360ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 176460ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 176556f101ecSGreg Kurz if (not_same_qid(&pdu->s->root_qid, &qid) || 176656f101ecSGreg Kurz strcmp("..", wnames[name_idx].data)) { 176756f101ecSGreg Kurz err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, 176856f101ecSGreg Kurz &path); 176960ce86c7SWei Liu if (err < 0) { 177060ce86c7SWei Liu goto out; 177160ce86c7SWei Liu } 177256f101ecSGreg Kurz 177360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 177460ce86c7SWei Liu if (err < 0) { 177560ce86c7SWei Liu goto out; 177660ce86c7SWei Liu } 17773b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 17783b5ee9e8SAntonios Motakis if (err < 0) { 17793b5ee9e8SAntonios Motakis goto out; 17803b5ee9e8SAntonios Motakis } 178160ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 178260ce86c7SWei Liu } 178356f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 178456f101ecSGreg Kurz } 178560ce86c7SWei Liu if (fid == newfid) { 178649dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 178749dd946bSGreg Kurz err = -EINVAL; 178849dd946bSGreg Kurz goto out; 178949dd946bSGreg Kurz } 17905b3c77aaSGreg Kurz v9fs_path_write_lock(s); 179160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 17925b3c77aaSGreg Kurz v9fs_path_unlock(s); 179360ce86c7SWei Liu } else { 179460ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 179560ce86c7SWei Liu if (newfidp == NULL) { 179660ce86c7SWei Liu err = -EINVAL; 179760ce86c7SWei Liu goto out; 179860ce86c7SWei Liu } 179960ce86c7SWei Liu newfidp->uid = fidp->uid; 180060ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 180160ce86c7SWei Liu } 180260ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 180360ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 180460ce86c7SWei Liu out: 180560ce86c7SWei Liu put_fid(pdu, fidp); 180660ce86c7SWei Liu if (newfidp) { 180760ce86c7SWei Liu put_fid(pdu, newfidp); 180860ce86c7SWei Liu } 180960ce86c7SWei Liu v9fs_path_free(&dpath); 181060ce86c7SWei Liu v9fs_path_free(&path); 181160ce86c7SWei Liu out_nofid: 181260ce86c7SWei Liu pdu_complete(pdu, err); 181360ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 181460ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 181560ce86c7SWei Liu v9fs_string_free(&wnames[name_idx]); 181660ce86c7SWei Liu } 181760ce86c7SWei Liu g_free(wnames); 181860ce86c7SWei Liu g_free(qids); 181960ce86c7SWei Liu } 182060ce86c7SWei Liu } 182160ce86c7SWei Liu 18228440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 182360ce86c7SWei Liu { 182460ce86c7SWei Liu struct statfs stbuf; 182560ce86c7SWei Liu int32_t iounit = 0; 182660ce86c7SWei Liu V9fsState *s = pdu->s; 182760ce86c7SWei Liu 182860ce86c7SWei Liu /* 182960ce86c7SWei Liu * iounit should be multiples of f_bsize (host filesystem block size 183060ce86c7SWei Liu * and as well as less than (client msize - P9_IOHDRSZ)) 183160ce86c7SWei Liu */ 183260ce86c7SWei Liu if (!v9fs_co_statfs(pdu, path, &stbuf)) { 183368d654daSDan Schatzberg if (stbuf.f_bsize) { 183460ce86c7SWei Liu iounit = stbuf.f_bsize; 183560ce86c7SWei Liu iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; 183660ce86c7SWei Liu } 183768d654daSDan Schatzberg } 183860ce86c7SWei Liu if (!iounit) { 183960ce86c7SWei Liu iounit = s->msize - P9_IOHDRSZ; 184060ce86c7SWei Liu } 184160ce86c7SWei Liu return iounit; 184260ce86c7SWei Liu } 184360ce86c7SWei Liu 18448440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 184560ce86c7SWei Liu { 184660ce86c7SWei Liu int flags; 184760ce86c7SWei Liu int32_t fid; 184860ce86c7SWei Liu int32_t mode; 184960ce86c7SWei Liu V9fsQID qid; 185060ce86c7SWei Liu int iounit = 0; 185160ce86c7SWei Liu ssize_t err = 0; 185260ce86c7SWei Liu size_t offset = 7; 185360ce86c7SWei Liu struct stat stbuf; 185460ce86c7SWei Liu V9fsFidState *fidp; 185560ce86c7SWei Liu V9fsPDU *pdu = opaque; 185660ce86c7SWei Liu V9fsState *s = pdu->s; 185760ce86c7SWei Liu 185860ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 185960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 186060ce86c7SWei Liu } else { 186160ce86c7SWei Liu uint8_t modebyte; 186260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 186360ce86c7SWei Liu mode = modebyte; 186460ce86c7SWei Liu } 186560ce86c7SWei Liu if (err < 0) { 186660ce86c7SWei Liu goto out_nofid; 186760ce86c7SWei Liu } 186860ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 186960ce86c7SWei Liu 187060ce86c7SWei Liu fidp = get_fid(pdu, fid); 187160ce86c7SWei Liu if (fidp == NULL) { 187260ce86c7SWei Liu err = -ENOENT; 187360ce86c7SWei Liu goto out_nofid; 187460ce86c7SWei Liu } 187549dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 187649dd946bSGreg Kurz err = -EINVAL; 187749dd946bSGreg Kurz goto out; 187849dd946bSGreg Kurz } 187960ce86c7SWei Liu 188060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 188160ce86c7SWei Liu if (err < 0) { 188260ce86c7SWei Liu goto out; 188360ce86c7SWei Liu } 18843b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18853b5ee9e8SAntonios Motakis if (err < 0) { 18863b5ee9e8SAntonios Motakis goto out; 18873b5ee9e8SAntonios Motakis } 188860ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 188960ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 189060ce86c7SWei Liu if (err < 0) { 189160ce86c7SWei Liu goto out; 189260ce86c7SWei Liu } 189360ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 189460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 189560ce86c7SWei Liu if (err < 0) { 189660ce86c7SWei Liu goto out; 189760ce86c7SWei Liu } 189860ce86c7SWei Liu err += offset; 189960ce86c7SWei Liu } else { 190060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 190160ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 190260ce86c7SWei Liu } else { 190360ce86c7SWei Liu flags = omode_to_uflags(mode); 190460ce86c7SWei Liu } 190560ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 190660ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 190760ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 190860ce86c7SWei Liu err = -EROFS; 190960ce86c7SWei Liu goto out; 191060ce86c7SWei Liu } 191160ce86c7SWei Liu } 191260ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 191360ce86c7SWei Liu if (err < 0) { 191460ce86c7SWei Liu goto out; 191560ce86c7SWei Liu } 191660ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 191760ce86c7SWei Liu fidp->open_flags = flags; 191860ce86c7SWei Liu if (flags & O_EXCL) { 191960ce86c7SWei Liu /* 192060ce86c7SWei Liu * We let the host file system do O_EXCL check 192160ce86c7SWei Liu * We should not reclaim such fd 192260ce86c7SWei Liu */ 192360ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 192460ce86c7SWei Liu } 192560ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 192660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 192760ce86c7SWei Liu if (err < 0) { 192860ce86c7SWei Liu goto out; 192960ce86c7SWei Liu } 193060ce86c7SWei Liu err += offset; 193160ce86c7SWei Liu } 193260ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 193360ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 193460ce86c7SWei Liu out: 193560ce86c7SWei Liu put_fid(pdu, fidp); 193660ce86c7SWei Liu out_nofid: 193760ce86c7SWei Liu pdu_complete(pdu, err); 193860ce86c7SWei Liu } 193960ce86c7SWei Liu 19408440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 194160ce86c7SWei Liu { 194260ce86c7SWei Liu int32_t dfid, flags, mode; 194360ce86c7SWei Liu gid_t gid; 194460ce86c7SWei Liu ssize_t err = 0; 194560ce86c7SWei Liu ssize_t offset = 7; 194660ce86c7SWei Liu V9fsString name; 194760ce86c7SWei Liu V9fsFidState *fidp; 194860ce86c7SWei Liu struct stat stbuf; 194960ce86c7SWei Liu V9fsQID qid; 195060ce86c7SWei Liu int32_t iounit; 195160ce86c7SWei Liu V9fsPDU *pdu = opaque; 195260ce86c7SWei Liu 195360ce86c7SWei Liu v9fs_string_init(&name); 195460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 195560ce86c7SWei Liu &name, &flags, &mode, &gid); 195660ce86c7SWei Liu if (err < 0) { 195760ce86c7SWei Liu goto out_nofid; 195860ce86c7SWei Liu } 195960ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 196060ce86c7SWei Liu 1961fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 1962fff39a7aSGreg Kurz err = -ENOENT; 1963fff39a7aSGreg Kurz goto out_nofid; 1964fff39a7aSGreg Kurz } 1965fff39a7aSGreg Kurz 1966805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 1967805b5d98SGreg Kurz err = -EEXIST; 1968805b5d98SGreg Kurz goto out_nofid; 1969805b5d98SGreg Kurz } 1970805b5d98SGreg Kurz 197160ce86c7SWei Liu fidp = get_fid(pdu, dfid); 197260ce86c7SWei Liu if (fidp == NULL) { 197360ce86c7SWei Liu err = -ENOENT; 197460ce86c7SWei Liu goto out_nofid; 197560ce86c7SWei Liu } 1976d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 1977d63fb193SLi Qiang err = -EINVAL; 1978d63fb193SLi Qiang goto out; 1979d63fb193SLi Qiang } 198060ce86c7SWei Liu 198160ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 198260ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 198360ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 198460ce86c7SWei Liu if (err < 0) { 198560ce86c7SWei Liu goto out; 198660ce86c7SWei Liu } 198760ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 198860ce86c7SWei Liu fidp->open_flags = flags; 198960ce86c7SWei Liu if (flags & O_EXCL) { 199060ce86c7SWei Liu /* 199160ce86c7SWei Liu * We let the host file system do O_EXCL check 199260ce86c7SWei Liu * We should not reclaim such fd 199360ce86c7SWei Liu */ 199460ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 199560ce86c7SWei Liu } 199660ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 19973b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19983b5ee9e8SAntonios Motakis if (err < 0) { 19993b5ee9e8SAntonios Motakis goto out; 20003b5ee9e8SAntonios Motakis } 200160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 200260ce86c7SWei Liu if (err < 0) { 200360ce86c7SWei Liu goto out; 200460ce86c7SWei Liu } 200560ce86c7SWei Liu err += offset; 200660ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 200760ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 200860ce86c7SWei Liu out: 200960ce86c7SWei Liu put_fid(pdu, fidp); 201060ce86c7SWei Liu out_nofid: 201160ce86c7SWei Liu pdu_complete(pdu, err); 201260ce86c7SWei Liu v9fs_string_free(&name); 201360ce86c7SWei Liu } 201460ce86c7SWei Liu 2015a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 201660ce86c7SWei Liu { 201760ce86c7SWei Liu int err; 201860ce86c7SWei Liu int32_t fid; 201960ce86c7SWei Liu int datasync; 202060ce86c7SWei Liu size_t offset = 7; 202160ce86c7SWei Liu V9fsFidState *fidp; 202260ce86c7SWei Liu V9fsPDU *pdu = opaque; 202360ce86c7SWei Liu 202460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 202560ce86c7SWei Liu if (err < 0) { 202660ce86c7SWei Liu goto out_nofid; 202760ce86c7SWei Liu } 202860ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 202960ce86c7SWei Liu 203060ce86c7SWei Liu fidp = get_fid(pdu, fid); 203160ce86c7SWei Liu if (fidp == NULL) { 203260ce86c7SWei Liu err = -ENOENT; 203360ce86c7SWei Liu goto out_nofid; 203460ce86c7SWei Liu } 203560ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 203660ce86c7SWei Liu if (!err) { 203760ce86c7SWei Liu err = offset; 203860ce86c7SWei Liu } 203960ce86c7SWei Liu put_fid(pdu, fidp); 204060ce86c7SWei Liu out_nofid: 204160ce86c7SWei Liu pdu_complete(pdu, err); 204260ce86c7SWei Liu } 204360ce86c7SWei Liu 20448440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 204560ce86c7SWei Liu { 204660ce86c7SWei Liu int err; 204760ce86c7SWei Liu int32_t fid; 204860ce86c7SWei Liu size_t offset = 7; 204960ce86c7SWei Liu V9fsFidState *fidp; 205060ce86c7SWei Liu V9fsPDU *pdu = opaque; 205160ce86c7SWei Liu V9fsState *s = pdu->s; 205260ce86c7SWei Liu 205360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 205460ce86c7SWei Liu if (err < 0) { 205560ce86c7SWei Liu goto out_nofid; 205660ce86c7SWei Liu } 205760ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 205860ce86c7SWei Liu 205960ce86c7SWei Liu fidp = clunk_fid(s, fid); 206060ce86c7SWei Liu if (fidp == NULL) { 206160ce86c7SWei Liu err = -ENOENT; 206260ce86c7SWei Liu goto out_nofid; 206360ce86c7SWei Liu } 206460ce86c7SWei Liu /* 206560ce86c7SWei Liu * Bump the ref so that put_fid will 206660ce86c7SWei Liu * free the fid. 206760ce86c7SWei Liu */ 206860ce86c7SWei Liu fidp->ref++; 206960ce86c7SWei Liu err = put_fid(pdu, fidp); 207060ce86c7SWei Liu if (!err) { 207160ce86c7SWei Liu err = offset; 207260ce86c7SWei Liu } 207360ce86c7SWei Liu out_nofid: 207460ce86c7SWei Liu pdu_complete(pdu, err); 207560ce86c7SWei Liu } 207660ce86c7SWei Liu 2077bcb8998fSStefano Stabellini /* 2078bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2079bcb8998fSStefano Stabellini * 2080bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2081bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2082bcb8998fSStefano Stabellini * @size: number of bytes to include 2083bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2084bcb8998fSStefano Stabellini * 2085bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2086bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2087bcb8998fSStefano Stabellini */ 2088bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2089cf45183bSStefano Stabellini size_t skip, size_t size, 2090bcb8998fSStefano Stabellini bool is_write) 2091bcb8998fSStefano Stabellini { 2092bcb8998fSStefano Stabellini QEMUIOVector elem; 2093bcb8998fSStefano Stabellini struct iovec *iov; 2094bcb8998fSStefano Stabellini unsigned int niov; 2095bcb8998fSStefano Stabellini 209688da0b03SStefano Stabellini if (is_write) { 2097cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 209888da0b03SStefano Stabellini } else { 2099cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 210088da0b03SStefano Stabellini } 2101bcb8998fSStefano Stabellini 2102bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2103bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2104cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2105bcb8998fSStefano Stabellini } 2106bcb8998fSStefano Stabellini 210760ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 210860ce86c7SWei Liu uint64_t off, uint32_t max_count) 210960ce86c7SWei Liu { 211060ce86c7SWei Liu ssize_t err; 211160ce86c7SWei Liu size_t offset = 7; 2112cf45183bSStefano Stabellini uint64_t read_count; 2113bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 211460ce86c7SWei Liu 21157e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21167e55d65cSLi Qiang read_count = 0; 211716724a17SGreg Kurz } else { 2118cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2119cf45183bSStefano Stabellini } 2120cf45183bSStefano Stabellini if (read_count > max_count) { 212160ce86c7SWei Liu read_count = max_count; 212260ce86c7SWei Liu } 212360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 212460ce86c7SWei Liu if (err < 0) { 212560ce86c7SWei Liu return err; 212660ce86c7SWei Liu } 212760ce86c7SWei Liu offset += err; 212800588a0aSWei Liu 2129cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2130fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 213160ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 213260ce86c7SWei Liu read_count); 2133bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 213460ce86c7SWei Liu if (err < 0) { 213560ce86c7SWei Liu return err; 213660ce86c7SWei Liu } 213760ce86c7SWei Liu offset += err; 213860ce86c7SWei Liu return offset; 213960ce86c7SWei Liu } 214060ce86c7SWei Liu 21418440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 21428440e22eSGreg Kurz V9fsFidState *fidp, 21438440e22eSGreg Kurz uint32_t max_count) 214460ce86c7SWei Liu { 214560ce86c7SWei Liu V9fsPath path; 214660ce86c7SWei Liu V9fsStat v9stat; 214760ce86c7SWei Liu int len, err = 0; 214860ce86c7SWei Liu int32_t count = 0; 214960ce86c7SWei Liu struct stat stbuf; 215060ce86c7SWei Liu off_t saved_dir_pos; 2151635324e8SGreg Kurz struct dirent *dent; 215260ce86c7SWei Liu 215360ce86c7SWei Liu /* save the directory position */ 215460ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 215560ce86c7SWei Liu if (saved_dir_pos < 0) { 215660ce86c7SWei Liu return saved_dir_pos; 215760ce86c7SWei Liu } 215860ce86c7SWei Liu 215960ce86c7SWei Liu while (1) { 216060ce86c7SWei Liu v9fs_path_init(&path); 21617cde47d4SGreg Kurz 21627cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 21637cde47d4SGreg Kurz 2164635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2165635324e8SGreg Kurz if (err || !dent) { 216660ce86c7SWei Liu break; 216760ce86c7SWei Liu } 216860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 216960ce86c7SWei Liu if (err < 0) { 21708762a46dSGreg Kurz break; 217160ce86c7SWei Liu } 217260ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 217360ce86c7SWei Liu if (err < 0) { 21748762a46dSGreg Kurz break; 217560ce86c7SWei Liu } 21766069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 217760ce86c7SWei Liu if (err < 0) { 21788762a46dSGreg Kurz break; 217960ce86c7SWei Liu } 2180772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 21817cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 21827cde47d4SGreg Kurz 218360ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 218460ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 218560ce86c7SWei Liu v9fs_stat_free(&v9stat); 218660ce86c7SWei Liu v9fs_path_free(&path); 218760ce86c7SWei Liu return count; 218860ce86c7SWei Liu } 2189772a7369SJan Dakinevich 2190772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2191772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2192772a7369SJan Dakinevich 2193772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2194772a7369SJan Dakinevich 2195772a7369SJan Dakinevich if (len < 0) { 2196772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2197772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2198772a7369SJan Dakinevich v9fs_path_free(&path); 2199772a7369SJan Dakinevich return len; 2200772a7369SJan Dakinevich } 220160ce86c7SWei Liu count += len; 220260ce86c7SWei Liu v9fs_stat_free(&v9stat); 220360ce86c7SWei Liu v9fs_path_free(&path); 220460ce86c7SWei Liu saved_dir_pos = dent->d_off; 220560ce86c7SWei Liu } 22068762a46dSGreg Kurz 22077cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22087cde47d4SGreg Kurz 220960ce86c7SWei Liu v9fs_path_free(&path); 221060ce86c7SWei Liu if (err < 0) { 221160ce86c7SWei Liu return err; 221260ce86c7SWei Liu } 221360ce86c7SWei Liu return count; 221460ce86c7SWei Liu } 221560ce86c7SWei Liu 22168440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 221760ce86c7SWei Liu { 221860ce86c7SWei Liu int32_t fid; 221960ce86c7SWei Liu uint64_t off; 222060ce86c7SWei Liu ssize_t err = 0; 222160ce86c7SWei Liu int32_t count = 0; 222260ce86c7SWei Liu size_t offset = 7; 222360ce86c7SWei Liu uint32_t max_count; 222460ce86c7SWei Liu V9fsFidState *fidp; 222560ce86c7SWei Liu V9fsPDU *pdu = opaque; 222660ce86c7SWei Liu V9fsState *s = pdu->s; 222760ce86c7SWei Liu 222860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 222960ce86c7SWei Liu if (err < 0) { 223060ce86c7SWei Liu goto out_nofid; 223160ce86c7SWei Liu } 223260ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 223360ce86c7SWei Liu 223460ce86c7SWei Liu fidp = get_fid(pdu, fid); 223560ce86c7SWei Liu if (fidp == NULL) { 223660ce86c7SWei Liu err = -EINVAL; 223760ce86c7SWei Liu goto out_nofid; 223860ce86c7SWei Liu } 223960ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2240d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2241d2c5cf7cSChristian Schoenebeck warn_report_once( 2242d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2243d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2244d2c5cf7cSChristian Schoenebeck ); 2245d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2246d2c5cf7cSChristian Schoenebeck goto out; 2247d2c5cf7cSChristian Schoenebeck } 224860ce86c7SWei Liu if (off == 0) { 224960ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 225060ce86c7SWei Liu } 225160ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 225260ce86c7SWei Liu if (count < 0) { 225360ce86c7SWei Liu err = count; 225460ce86c7SWei Liu goto out; 225560ce86c7SWei Liu } 225660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 225760ce86c7SWei Liu if (err < 0) { 225860ce86c7SWei Liu goto out; 225960ce86c7SWei Liu } 226060ce86c7SWei Liu err += offset + count; 226160ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 226260ce86c7SWei Liu QEMUIOVector qiov_full; 226360ce86c7SWei Liu QEMUIOVector qiov; 226460ce86c7SWei Liu int32_t len; 226560ce86c7SWei Liu 2266cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 226760ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 226860ce86c7SWei Liu do { 226960ce86c7SWei Liu qemu_iovec_reset(&qiov); 227060ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 227160ce86c7SWei Liu if (0) { 227260ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 227360ce86c7SWei Liu } 227460ce86c7SWei Liu /* Loop in case of EINTR */ 227560ce86c7SWei Liu do { 227660ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 227760ce86c7SWei Liu if (len >= 0) { 227860ce86c7SWei Liu off += len; 227960ce86c7SWei Liu count += len; 228060ce86c7SWei Liu } 228160ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 228260ce86c7SWei Liu if (len < 0) { 228360ce86c7SWei Liu /* IO error return the error */ 228460ce86c7SWei Liu err = len; 2285e95c9a49SLi Qiang goto out_free_iovec; 228660ce86c7SWei Liu } 228760ce86c7SWei Liu } while (count < max_count && len > 0); 228860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 228960ce86c7SWei Liu if (err < 0) { 2290e95c9a49SLi Qiang goto out_free_iovec; 229160ce86c7SWei Liu } 229260ce86c7SWei Liu err += offset + count; 2293e95c9a49SLi Qiang out_free_iovec: 229460ce86c7SWei Liu qemu_iovec_destroy(&qiov); 229560ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 229660ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 229760ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 229860ce86c7SWei Liu } else { 229960ce86c7SWei Liu err = -EINVAL; 230060ce86c7SWei Liu } 230160ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 230260ce86c7SWei Liu out: 230360ce86c7SWei Liu put_fid(pdu, fidp); 230460ce86c7SWei Liu out_nofid: 230560ce86c7SWei Liu pdu_complete(pdu, err); 230660ce86c7SWei Liu } 230760ce86c7SWei Liu 230829c9d2caSChristian Schoenebeck /** 230929c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 231029c9d2caSChristian Schoenebeck * 231129c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 231229c9d2caSChristian Schoenebeck * @returns required size in bytes 231329c9d2caSChristian Schoenebeck */ 231429c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 231560ce86c7SWei Liu { 231660ce86c7SWei Liu /* 231760ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 231860ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 231960ce86c7SWei Liu */ 232060ce86c7SWei Liu return 24 + v9fs_string_size(name); 232160ce86c7SWei Liu } 232260ce86c7SWei Liu 23230c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 23240c4356baSChristian Schoenebeck { 23250c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 23260c4356baSChristian Schoenebeck 23270c4356baSChristian Schoenebeck for (; e; e = next) { 23280c4356baSChristian Schoenebeck next = e->next; 23290c4356baSChristian Schoenebeck g_free(e->dent); 23300c4356baSChristian Schoenebeck g_free(e->st); 23310c4356baSChristian Schoenebeck g_free(e); 23320c4356baSChristian Schoenebeck } 23330c4356baSChristian Schoenebeck } 23340c4356baSChristian Schoenebeck 23358440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 23360c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 233760ce86c7SWei Liu { 233860ce86c7SWei Liu size_t size; 233960ce86c7SWei Liu V9fsQID qid; 234060ce86c7SWei Liu V9fsString name; 234160ce86c7SWei Liu int len, err = 0; 234260ce86c7SWei Liu int32_t count = 0; 2343635324e8SGreg Kurz struct dirent *dent; 23440c4356baSChristian Schoenebeck struct stat *st; 23450c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 234660ce86c7SWei Liu 23470c4356baSChristian Schoenebeck /* 23480c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 23490c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 23500c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 23510c4356baSChristian Schoenebeck */ 23520c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 23530c4356baSChristian Schoenebeck 23540c4356baSChristian Schoenebeck /* 23550c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 23560c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 23570c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 23580c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 23590c4356baSChristian Schoenebeck */ 23600c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 23610c4356baSChristian Schoenebeck dostat); 23620c4356baSChristian Schoenebeck if (count < 0) { 23630c4356baSChristian Schoenebeck err = count; 23640c4356baSChristian Schoenebeck count = 0; 23650c4356baSChristian Schoenebeck goto out; 236660ce86c7SWei Liu } 23670c4356baSChristian Schoenebeck count = 0; 236860ce86c7SWei Liu 23690c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 23700c4356baSChristian Schoenebeck dent = e->dent; 23711a6ed33cSAntonios Motakis 23721a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 23730c4356baSChristian Schoenebeck st = e->st; 23740c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 23750c4356baSChristian Schoenebeck if (!st) { 23760c4356baSChristian Schoenebeck err = -1; 23770c4356baSChristian Schoenebeck break; 23780c4356baSChristian Schoenebeck } 23790c4356baSChristian Schoenebeck 23800c4356baSChristian Schoenebeck /* remap inode */ 23810c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 23821a6ed33cSAntonios Motakis if (err < 0) { 23830c4356baSChristian Schoenebeck break; 23841a6ed33cSAntonios Motakis } 23851a6ed33cSAntonios Motakis } else { 238660ce86c7SWei Liu /* 238760ce86c7SWei Liu * Fill up just the path field of qid because the client uses 238860ce86c7SWei Liu * only that. To fill the entire qid structure we will have 23891a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 23900c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 23911a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 23921a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 23931a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 23941a6ed33cSAntonios Motakis * files/dirs through other ways. 239560ce86c7SWei Liu */ 239660ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 239760ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 239860ce86c7SWei Liu /* Fill the other fields with dummy values */ 239960ce86c7SWei Liu qid.type = 0; 240060ce86c7SWei Liu qid.version = 0; 24011a6ed33cSAntonios Motakis } 240260ce86c7SWei Liu 24030c4356baSChristian Schoenebeck v9fs_string_init(&name); 24040c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24050c4356baSChristian Schoenebeck 240660ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 240760ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 240860ce86c7SWei Liu &qid, dent->d_off, 240960ce86c7SWei Liu dent->d_type, &name); 24107cde47d4SGreg Kurz 24110c4356baSChristian Schoenebeck v9fs_string_free(&name); 24127cde47d4SGreg Kurz 241360ce86c7SWei Liu if (len < 0) { 24140c4356baSChristian Schoenebeck err = len; 24150c4356baSChristian Schoenebeck break; 241660ce86c7SWei Liu } 24170c4356baSChristian Schoenebeck 241860ce86c7SWei Liu count += len; 241960ce86c7SWei Liu } 24207cde47d4SGreg Kurz 24210c4356baSChristian Schoenebeck out: 24220c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 242360ce86c7SWei Liu if (err < 0) { 242460ce86c7SWei Liu return err; 242560ce86c7SWei Liu } 242660ce86c7SWei Liu return count; 242760ce86c7SWei Liu } 242860ce86c7SWei Liu 24298440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 243060ce86c7SWei Liu { 243160ce86c7SWei Liu int32_t fid; 243260ce86c7SWei Liu V9fsFidState *fidp; 243360ce86c7SWei Liu ssize_t retval = 0; 243460ce86c7SWei Liu size_t offset = 7; 243560ce86c7SWei Liu uint64_t initial_offset; 243660ce86c7SWei Liu int32_t count; 243760ce86c7SWei Liu uint32_t max_count; 243860ce86c7SWei Liu V9fsPDU *pdu = opaque; 2439d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 244060ce86c7SWei Liu 244160ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 244260ce86c7SWei Liu &initial_offset, &max_count); 244360ce86c7SWei Liu if (retval < 0) { 244460ce86c7SWei Liu goto out_nofid; 244560ce86c7SWei Liu } 244660ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 244760ce86c7SWei Liu 2448d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2449d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2450d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2451d36a5c22SChristian Schoenebeck warn_report_once( 2452d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2453d36a5c22SChristian Schoenebeck ); 2454d36a5c22SChristian Schoenebeck } 2455d36a5c22SChristian Schoenebeck 245660ce86c7SWei Liu fidp = get_fid(pdu, fid); 245760ce86c7SWei Liu if (fidp == NULL) { 245860ce86c7SWei Liu retval = -EINVAL; 245960ce86c7SWei Liu goto out_nofid; 246060ce86c7SWei Liu } 2461f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 246260ce86c7SWei Liu retval = -EINVAL; 246360ce86c7SWei Liu goto out; 246460ce86c7SWei Liu } 2465d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2466d2c5cf7cSChristian Schoenebeck warn_report_once( 2467d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2468d2c5cf7cSChristian Schoenebeck "protocol version" 2469d2c5cf7cSChristian Schoenebeck ); 2470d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2471d2c5cf7cSChristian Schoenebeck goto out; 2472d2c5cf7cSChristian Schoenebeck } 24730c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 247460ce86c7SWei Liu if (count < 0) { 247560ce86c7SWei Liu retval = count; 247660ce86c7SWei Liu goto out; 247760ce86c7SWei Liu } 247860ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 247960ce86c7SWei Liu if (retval < 0) { 248060ce86c7SWei Liu goto out; 248160ce86c7SWei Liu } 248260ce86c7SWei Liu retval += count + offset; 248360ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 248460ce86c7SWei Liu out: 248560ce86c7SWei Liu put_fid(pdu, fidp); 248660ce86c7SWei Liu out_nofid: 248760ce86c7SWei Liu pdu_complete(pdu, retval); 248860ce86c7SWei Liu } 248960ce86c7SWei Liu 249060ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 249160ce86c7SWei Liu uint64_t off, uint32_t count, 249260ce86c7SWei Liu struct iovec *sg, int cnt) 249360ce86c7SWei Liu { 249460ce86c7SWei Liu int i, to_copy; 249560ce86c7SWei Liu ssize_t err = 0; 24967e55d65cSLi Qiang uint64_t write_count; 249760ce86c7SWei Liu size_t offset = 7; 249860ce86c7SWei Liu 249960ce86c7SWei Liu 25007e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2501b858e80aSDaniel Henrique Barboza return -ENOSPC; 250260ce86c7SWei Liu } 25037e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 25047e55d65cSLi Qiang if (write_count > count) { 25057e55d65cSLi Qiang write_count = count; 25067e55d65cSLi Qiang } 250760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 250860ce86c7SWei Liu if (err < 0) { 250960ce86c7SWei Liu return err; 251060ce86c7SWei Liu } 251160ce86c7SWei Liu err += offset; 251260ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 251360ce86c7SWei Liu /* 251460ce86c7SWei Liu * Now copy the content from sg list 251560ce86c7SWei Liu */ 251660ce86c7SWei Liu for (i = 0; i < cnt; i++) { 251760ce86c7SWei Liu if (write_count > sg[i].iov_len) { 251860ce86c7SWei Liu to_copy = sg[i].iov_len; 251960ce86c7SWei Liu } else { 252060ce86c7SWei Liu to_copy = write_count; 252160ce86c7SWei Liu } 252260ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 252360ce86c7SWei Liu /* updating vs->off since we are not using below */ 252460ce86c7SWei Liu off += to_copy; 252560ce86c7SWei Liu write_count -= to_copy; 252660ce86c7SWei Liu } 2527b858e80aSDaniel Henrique Barboza 252860ce86c7SWei Liu return err; 252960ce86c7SWei Liu } 253060ce86c7SWei Liu 25318440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 253260ce86c7SWei Liu { 253360ce86c7SWei Liu ssize_t err; 253460ce86c7SWei Liu int32_t fid; 253560ce86c7SWei Liu uint64_t off; 253660ce86c7SWei Liu uint32_t count; 253760ce86c7SWei Liu int32_t len = 0; 253860ce86c7SWei Liu int32_t total = 0; 253960ce86c7SWei Liu size_t offset = 7; 254060ce86c7SWei Liu V9fsFidState *fidp; 254160ce86c7SWei Liu V9fsPDU *pdu = opaque; 254260ce86c7SWei Liu V9fsState *s = pdu->s; 254360ce86c7SWei Liu QEMUIOVector qiov_full; 254460ce86c7SWei Liu QEMUIOVector qiov; 254560ce86c7SWei Liu 254660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 254760ce86c7SWei Liu if (err < 0) { 254860ce86c7SWei Liu pdu_complete(pdu, err); 254960ce86c7SWei Liu return; 255060ce86c7SWei Liu } 255160ce86c7SWei Liu offset += err; 2552cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 255360ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 255460ce86c7SWei Liu 255560ce86c7SWei Liu fidp = get_fid(pdu, fid); 255660ce86c7SWei Liu if (fidp == NULL) { 255760ce86c7SWei Liu err = -EINVAL; 255860ce86c7SWei Liu goto out_nofid; 255960ce86c7SWei Liu } 256060ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 256160ce86c7SWei Liu if (fidp->fs.fd == -1) { 256260ce86c7SWei Liu err = -EINVAL; 256360ce86c7SWei Liu goto out; 256460ce86c7SWei Liu } 256560ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 256660ce86c7SWei Liu /* 256760ce86c7SWei Liu * setxattr operation 256860ce86c7SWei Liu */ 256960ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 257060ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 257160ce86c7SWei Liu goto out; 257260ce86c7SWei Liu } else { 257360ce86c7SWei Liu err = -EINVAL; 257460ce86c7SWei Liu goto out; 257560ce86c7SWei Liu } 257660ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 257760ce86c7SWei Liu do { 257860ce86c7SWei Liu qemu_iovec_reset(&qiov); 257960ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 258060ce86c7SWei Liu if (0) { 258160ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 258260ce86c7SWei Liu } 258360ce86c7SWei Liu /* Loop in case of EINTR */ 258460ce86c7SWei Liu do { 258560ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 258660ce86c7SWei Liu if (len >= 0) { 258760ce86c7SWei Liu off += len; 258860ce86c7SWei Liu total += len; 258960ce86c7SWei Liu } 259060ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 259160ce86c7SWei Liu if (len < 0) { 259260ce86c7SWei Liu /* IO error return the error */ 259360ce86c7SWei Liu err = len; 259460ce86c7SWei Liu goto out_qiov; 259560ce86c7SWei Liu } 259660ce86c7SWei Liu } while (total < count && len > 0); 259760ce86c7SWei Liu 259860ce86c7SWei Liu offset = 7; 259960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 260060ce86c7SWei Liu if (err < 0) { 2601fdfcc9aeSLi Qiang goto out_qiov; 260260ce86c7SWei Liu } 260360ce86c7SWei Liu err += offset; 260460ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 260560ce86c7SWei Liu out_qiov: 260660ce86c7SWei Liu qemu_iovec_destroy(&qiov); 260760ce86c7SWei Liu out: 260860ce86c7SWei Liu put_fid(pdu, fidp); 260960ce86c7SWei Liu out_nofid: 261060ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 261160ce86c7SWei Liu pdu_complete(pdu, err); 261260ce86c7SWei Liu } 261360ce86c7SWei Liu 26148440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 261560ce86c7SWei Liu { 261660ce86c7SWei Liu int32_t fid; 261760ce86c7SWei Liu int err = 0; 261860ce86c7SWei Liu size_t offset = 7; 261960ce86c7SWei Liu V9fsFidState *fidp; 262060ce86c7SWei Liu V9fsQID qid; 262160ce86c7SWei Liu int32_t perm; 262260ce86c7SWei Liu int8_t mode; 262360ce86c7SWei Liu V9fsPath path; 262460ce86c7SWei Liu struct stat stbuf; 262560ce86c7SWei Liu V9fsString name; 262660ce86c7SWei Liu V9fsString extension; 262760ce86c7SWei Liu int iounit; 262860ce86c7SWei Liu V9fsPDU *pdu = opaque; 26295b3c77aaSGreg Kurz V9fsState *s = pdu->s; 263060ce86c7SWei Liu 263160ce86c7SWei Liu v9fs_path_init(&path); 263260ce86c7SWei Liu v9fs_string_init(&name); 263360ce86c7SWei Liu v9fs_string_init(&extension); 263460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 263560ce86c7SWei Liu &perm, &mode, &extension); 263660ce86c7SWei Liu if (err < 0) { 263760ce86c7SWei Liu goto out_nofid; 263860ce86c7SWei Liu } 263960ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 264060ce86c7SWei Liu 2641fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2642fff39a7aSGreg Kurz err = -ENOENT; 2643fff39a7aSGreg Kurz goto out_nofid; 2644fff39a7aSGreg Kurz } 2645fff39a7aSGreg Kurz 2646805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2647805b5d98SGreg Kurz err = -EEXIST; 2648805b5d98SGreg Kurz goto out_nofid; 2649805b5d98SGreg Kurz } 2650805b5d98SGreg Kurz 265160ce86c7SWei Liu fidp = get_fid(pdu, fid); 265260ce86c7SWei Liu if (fidp == NULL) { 265360ce86c7SWei Liu err = -EINVAL; 265460ce86c7SWei Liu goto out_nofid; 265560ce86c7SWei Liu } 2656d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2657d63fb193SLi Qiang err = -EINVAL; 2658d63fb193SLi Qiang goto out; 2659d63fb193SLi Qiang } 266060ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 266160ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 266260ce86c7SWei Liu fidp->uid, -1, &stbuf); 266360ce86c7SWei Liu if (err < 0) { 266460ce86c7SWei Liu goto out; 266560ce86c7SWei Liu } 266660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 266760ce86c7SWei Liu if (err < 0) { 266860ce86c7SWei Liu goto out; 266960ce86c7SWei Liu } 26705b3c77aaSGreg Kurz v9fs_path_write_lock(s); 267160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26725b3c77aaSGreg Kurz v9fs_path_unlock(s); 267360ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 267460ce86c7SWei Liu if (err < 0) { 267560ce86c7SWei Liu goto out; 267660ce86c7SWei Liu } 267760ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 267860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 267960ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 268060ce86c7SWei Liu extension.data, -1 , &stbuf); 268160ce86c7SWei Liu if (err < 0) { 268260ce86c7SWei Liu goto out; 268360ce86c7SWei Liu } 268460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 268560ce86c7SWei Liu if (err < 0) { 268660ce86c7SWei Liu goto out; 268760ce86c7SWei Liu } 26885b3c77aaSGreg Kurz v9fs_path_write_lock(s); 268960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26905b3c77aaSGreg Kurz v9fs_path_unlock(s); 269160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 269260ce86c7SWei Liu int32_t ofid = atoi(extension.data); 269360ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 269460ce86c7SWei Liu if (ofidp == NULL) { 269560ce86c7SWei Liu err = -EINVAL; 269660ce86c7SWei Liu goto out; 269760ce86c7SWei Liu } 269860ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 269960ce86c7SWei Liu put_fid(pdu, ofidp); 270060ce86c7SWei Liu if (err < 0) { 270160ce86c7SWei Liu goto out; 270260ce86c7SWei Liu } 270360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 270460ce86c7SWei Liu if (err < 0) { 270560ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 270660ce86c7SWei Liu goto out; 270760ce86c7SWei Liu } 27085b3c77aaSGreg Kurz v9fs_path_write_lock(s); 270960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27105b3c77aaSGreg Kurz v9fs_path_unlock(s); 271160ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 271260ce86c7SWei Liu if (err < 0) { 271360ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 271460ce86c7SWei Liu goto out; 271560ce86c7SWei Liu } 271660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 271760ce86c7SWei Liu char ctype; 271860ce86c7SWei Liu uint32_t major, minor; 271960ce86c7SWei Liu mode_t nmode = 0; 272060ce86c7SWei Liu 272160ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 272260ce86c7SWei Liu err = -errno; 272360ce86c7SWei Liu goto out; 272460ce86c7SWei Liu } 272560ce86c7SWei Liu 272660ce86c7SWei Liu switch (ctype) { 272760ce86c7SWei Liu case 'c': 272860ce86c7SWei Liu nmode = S_IFCHR; 272960ce86c7SWei Liu break; 273060ce86c7SWei Liu case 'b': 273160ce86c7SWei Liu nmode = S_IFBLK; 273260ce86c7SWei Liu break; 273360ce86c7SWei Liu default: 273460ce86c7SWei Liu err = -EIO; 273560ce86c7SWei Liu goto out; 273660ce86c7SWei Liu } 273760ce86c7SWei Liu 273860ce86c7SWei Liu nmode |= perm & 0777; 273960ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 274060ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 274160ce86c7SWei Liu if (err < 0) { 274260ce86c7SWei Liu goto out; 274360ce86c7SWei Liu } 274460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 274560ce86c7SWei Liu if (err < 0) { 274660ce86c7SWei Liu goto out; 274760ce86c7SWei Liu } 27485b3c77aaSGreg Kurz v9fs_path_write_lock(s); 274960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27505b3c77aaSGreg Kurz v9fs_path_unlock(s); 275160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 275260ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 275360ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 275460ce86c7SWei Liu if (err < 0) { 275560ce86c7SWei Liu goto out; 275660ce86c7SWei Liu } 275760ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 275860ce86c7SWei Liu if (err < 0) { 275960ce86c7SWei Liu goto out; 276060ce86c7SWei Liu } 27615b3c77aaSGreg Kurz v9fs_path_write_lock(s); 276260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27635b3c77aaSGreg Kurz v9fs_path_unlock(s); 276460ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 276560ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 276660ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 276760ce86c7SWei Liu if (err < 0) { 276860ce86c7SWei Liu goto out; 276960ce86c7SWei Liu } 277060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 277160ce86c7SWei Liu if (err < 0) { 277260ce86c7SWei Liu goto out; 277360ce86c7SWei Liu } 27745b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277560ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27765b3c77aaSGreg Kurz v9fs_path_unlock(s); 277760ce86c7SWei Liu } else { 277860ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 277960ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 278060ce86c7SWei Liu if (err < 0) { 278160ce86c7SWei Liu goto out; 278260ce86c7SWei Liu } 278360ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 278460ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 278560ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 278660ce86c7SWei Liu /* 278760ce86c7SWei Liu * We let the host file system do O_EXCL check 278860ce86c7SWei Liu * We should not reclaim such fd 278960ce86c7SWei Liu */ 279060ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 279160ce86c7SWei Liu } 279260ce86c7SWei Liu } 279360ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 27943b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 27953b5ee9e8SAntonios Motakis if (err < 0) { 27963b5ee9e8SAntonios Motakis goto out; 27973b5ee9e8SAntonios Motakis } 279860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 279960ce86c7SWei Liu if (err < 0) { 280060ce86c7SWei Liu goto out; 280160ce86c7SWei Liu } 280260ce86c7SWei Liu err += offset; 280360ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 280460ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 280560ce86c7SWei Liu out: 280660ce86c7SWei Liu put_fid(pdu, fidp); 280760ce86c7SWei Liu out_nofid: 280860ce86c7SWei Liu pdu_complete(pdu, err); 280960ce86c7SWei Liu v9fs_string_free(&name); 281060ce86c7SWei Liu v9fs_string_free(&extension); 281160ce86c7SWei Liu v9fs_path_free(&path); 281260ce86c7SWei Liu } 281360ce86c7SWei Liu 28148440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 281560ce86c7SWei Liu { 281660ce86c7SWei Liu V9fsPDU *pdu = opaque; 281760ce86c7SWei Liu V9fsString name; 281860ce86c7SWei Liu V9fsString symname; 281960ce86c7SWei Liu V9fsFidState *dfidp; 282060ce86c7SWei Liu V9fsQID qid; 282160ce86c7SWei Liu struct stat stbuf; 282260ce86c7SWei Liu int32_t dfid; 282360ce86c7SWei Liu int err = 0; 282460ce86c7SWei Liu gid_t gid; 282560ce86c7SWei Liu size_t offset = 7; 282660ce86c7SWei Liu 282760ce86c7SWei Liu v9fs_string_init(&name); 282860ce86c7SWei Liu v9fs_string_init(&symname); 282960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 283060ce86c7SWei Liu if (err < 0) { 283160ce86c7SWei Liu goto out_nofid; 283260ce86c7SWei Liu } 283360ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 283460ce86c7SWei Liu 2835fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2836fff39a7aSGreg Kurz err = -ENOENT; 2837fff39a7aSGreg Kurz goto out_nofid; 2838fff39a7aSGreg Kurz } 2839fff39a7aSGreg Kurz 2840805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2841805b5d98SGreg Kurz err = -EEXIST; 2842805b5d98SGreg Kurz goto out_nofid; 2843805b5d98SGreg Kurz } 2844805b5d98SGreg Kurz 284560ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 284660ce86c7SWei Liu if (dfidp == NULL) { 284760ce86c7SWei Liu err = -EINVAL; 284860ce86c7SWei Liu goto out_nofid; 284960ce86c7SWei Liu } 285060ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 285160ce86c7SWei Liu if (err < 0) { 285260ce86c7SWei Liu goto out; 285360ce86c7SWei Liu } 28543b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28553b5ee9e8SAntonios Motakis if (err < 0) { 28563b5ee9e8SAntonios Motakis goto out; 28573b5ee9e8SAntonios Motakis } 285860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 285960ce86c7SWei Liu if (err < 0) { 286060ce86c7SWei Liu goto out; 286160ce86c7SWei Liu } 286260ce86c7SWei Liu err += offset; 286360ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 286460ce86c7SWei Liu qid.type, qid.version, qid.path); 286560ce86c7SWei Liu out: 286660ce86c7SWei Liu put_fid(pdu, dfidp); 286760ce86c7SWei Liu out_nofid: 286860ce86c7SWei Liu pdu_complete(pdu, err); 286960ce86c7SWei Liu v9fs_string_free(&name); 287060ce86c7SWei Liu v9fs_string_free(&symname); 287160ce86c7SWei Liu } 287260ce86c7SWei Liu 2873a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 287460ce86c7SWei Liu { 287560ce86c7SWei Liu ssize_t err; 287660ce86c7SWei Liu int16_t tag; 287760ce86c7SWei Liu size_t offset = 7; 2878d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 287960ce86c7SWei Liu V9fsPDU *pdu = opaque; 288060ce86c7SWei Liu V9fsState *s = pdu->s; 288160ce86c7SWei Liu 288260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 288360ce86c7SWei Liu if (err < 0) { 288460ce86c7SWei Liu pdu_complete(pdu, err); 288560ce86c7SWei Liu return; 288660ce86c7SWei Liu } 288760ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 288860ce86c7SWei Liu 2889d5f2af7bSGreg Kurz if (pdu->tag == tag) { 28903dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2891d5f2af7bSGreg Kurz } else { 289260ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 289360ce86c7SWei Liu if (cancel_pdu->tag == tag) { 289460ce86c7SWei Liu break; 289560ce86c7SWei Liu } 289660ce86c7SWei Liu } 2897d5f2af7bSGreg Kurz } 289860ce86c7SWei Liu if (cancel_pdu) { 289960ce86c7SWei Liu cancel_pdu->cancelled = 1; 290060ce86c7SWei Liu /* 290160ce86c7SWei Liu * Wait for pdu to complete. 290260ce86c7SWei Liu */ 29031ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 290418adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 290560ce86c7SWei Liu cancel_pdu->cancelled = 0; 290660ce86c7SWei Liu pdu_free(cancel_pdu); 290760ce86c7SWei Liu } 290818adde86SGreg Kurz } 290960ce86c7SWei Liu pdu_complete(pdu, 7); 291060ce86c7SWei Liu } 291160ce86c7SWei Liu 29128440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 291360ce86c7SWei Liu { 291460ce86c7SWei Liu V9fsPDU *pdu = opaque; 291560ce86c7SWei Liu int32_t dfid, oldfid; 291660ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 291760ce86c7SWei Liu V9fsString name; 291860ce86c7SWei Liu size_t offset = 7; 291960ce86c7SWei Liu int err = 0; 292060ce86c7SWei Liu 292160ce86c7SWei Liu v9fs_string_init(&name); 292260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 292360ce86c7SWei Liu if (err < 0) { 292460ce86c7SWei Liu goto out_nofid; 292560ce86c7SWei Liu } 292660ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 292760ce86c7SWei Liu 2928fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2929fff39a7aSGreg Kurz err = -ENOENT; 2930fff39a7aSGreg Kurz goto out_nofid; 2931fff39a7aSGreg Kurz } 2932fff39a7aSGreg Kurz 2933805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2934805b5d98SGreg Kurz err = -EEXIST; 2935805b5d98SGreg Kurz goto out_nofid; 2936805b5d98SGreg Kurz } 2937805b5d98SGreg Kurz 293860ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 293960ce86c7SWei Liu if (dfidp == NULL) { 294060ce86c7SWei Liu err = -ENOENT; 294160ce86c7SWei Liu goto out_nofid; 294260ce86c7SWei Liu } 294360ce86c7SWei Liu 294460ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 294560ce86c7SWei Liu if (oldfidp == NULL) { 294660ce86c7SWei Liu err = -ENOENT; 294760ce86c7SWei Liu goto out; 294860ce86c7SWei Liu } 294960ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 295060ce86c7SWei Liu if (!err) { 295160ce86c7SWei Liu err = offset; 295260ce86c7SWei Liu } 29534c158678SLi Qiang put_fid(pdu, oldfidp); 295460ce86c7SWei Liu out: 295560ce86c7SWei Liu put_fid(pdu, dfidp); 295660ce86c7SWei Liu out_nofid: 295760ce86c7SWei Liu v9fs_string_free(&name); 295860ce86c7SWei Liu pdu_complete(pdu, err); 295960ce86c7SWei Liu } 296060ce86c7SWei Liu 296160ce86c7SWei Liu /* Only works with path name based fid */ 29628440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 296360ce86c7SWei Liu { 296460ce86c7SWei Liu int32_t fid; 296560ce86c7SWei Liu int err = 0; 296660ce86c7SWei Liu size_t offset = 7; 296760ce86c7SWei Liu V9fsFidState *fidp; 296860ce86c7SWei Liu V9fsPDU *pdu = opaque; 296960ce86c7SWei Liu 297060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 297160ce86c7SWei Liu if (err < 0) { 297260ce86c7SWei Liu goto out_nofid; 297360ce86c7SWei Liu } 297460ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 297560ce86c7SWei Liu 297660ce86c7SWei Liu fidp = get_fid(pdu, fid); 297760ce86c7SWei Liu if (fidp == NULL) { 297860ce86c7SWei Liu err = -EINVAL; 297960ce86c7SWei Liu goto out_nofid; 298060ce86c7SWei Liu } 298160ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 298260ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 298360ce86c7SWei Liu err = -EOPNOTSUPP; 298460ce86c7SWei Liu goto out_err; 298560ce86c7SWei Liu } 298660ce86c7SWei Liu /* 298760ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 298860ce86c7SWei Liu * the file later. So don't reclaim fd 298960ce86c7SWei Liu */ 299060ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 299160ce86c7SWei Liu if (err < 0) { 299260ce86c7SWei Liu goto out_err; 299360ce86c7SWei Liu } 299460ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 299560ce86c7SWei Liu if (!err) { 299660ce86c7SWei Liu err = offset; 299760ce86c7SWei Liu } 299860ce86c7SWei Liu out_err: 299960ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 300060ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 300160ce86c7SWei Liu put_fid(pdu, fidp); 300260ce86c7SWei Liu out_nofid: 300360ce86c7SWei Liu pdu_complete(pdu, err); 300460ce86c7SWei Liu } 300560ce86c7SWei Liu 30068440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 300760ce86c7SWei Liu { 300860ce86c7SWei Liu int err = 0; 300960ce86c7SWei Liu V9fsString name; 301067e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 301160ce86c7SWei Liu size_t offset = 7; 301260ce86c7SWei Liu V9fsPath path; 301360ce86c7SWei Liu V9fsFidState *dfidp; 301460ce86c7SWei Liu V9fsPDU *pdu = opaque; 301560ce86c7SWei Liu 301660ce86c7SWei Liu v9fs_string_init(&name); 301760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 301860ce86c7SWei Liu if (err < 0) { 301960ce86c7SWei Liu goto out_nofid; 302060ce86c7SWei Liu } 3021fff39a7aSGreg Kurz 3022fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3023fff39a7aSGreg Kurz err = -ENOENT; 3024fff39a7aSGreg Kurz goto out_nofid; 3025fff39a7aSGreg Kurz } 3026fff39a7aSGreg Kurz 3027805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3028805b5d98SGreg Kurz err = -EINVAL; 3029805b5d98SGreg Kurz goto out_nofid; 3030805b5d98SGreg Kurz } 3031805b5d98SGreg Kurz 3032805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3033805b5d98SGreg Kurz err = -ENOTEMPTY; 3034805b5d98SGreg Kurz goto out_nofid; 3035805b5d98SGreg Kurz } 3036805b5d98SGreg Kurz 303767e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 303867e87345SKeno Fischer err = -EINVAL; 303967e87345SKeno Fischer goto out_nofid; 304067e87345SKeno Fischer } 304167e87345SKeno Fischer 304267e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 304367e87345SKeno Fischer rflags |= AT_REMOVEDIR; 304467e87345SKeno Fischer } 304567e87345SKeno Fischer 304660ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 304760ce86c7SWei Liu if (dfidp == NULL) { 304860ce86c7SWei Liu err = -EINVAL; 304960ce86c7SWei Liu goto out_nofid; 305060ce86c7SWei Liu } 305160ce86c7SWei Liu /* 305260ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 305360ce86c7SWei Liu * the file later. So don't reclaim fd 305460ce86c7SWei Liu */ 305560ce86c7SWei Liu v9fs_path_init(&path); 305660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 305760ce86c7SWei Liu if (err < 0) { 305860ce86c7SWei Liu goto out_err; 305960ce86c7SWei Liu } 306060ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 306160ce86c7SWei Liu if (err < 0) { 306260ce86c7SWei Liu goto out_err; 306360ce86c7SWei Liu } 306467e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 306560ce86c7SWei Liu if (!err) { 306660ce86c7SWei Liu err = offset; 306760ce86c7SWei Liu } 306860ce86c7SWei Liu out_err: 306960ce86c7SWei Liu put_fid(pdu, dfidp); 307060ce86c7SWei Liu v9fs_path_free(&path); 307160ce86c7SWei Liu out_nofid: 307260ce86c7SWei Liu pdu_complete(pdu, err); 307360ce86c7SWei Liu v9fs_string_free(&name); 307460ce86c7SWei Liu } 307560ce86c7SWei Liu 307660ce86c7SWei Liu 307760ce86c7SWei Liu /* Only works with path name based fid */ 30788440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 30798440e22eSGreg Kurz int32_t newdirfid, 30808440e22eSGreg Kurz V9fsString *name) 308160ce86c7SWei Liu { 308260ce86c7SWei Liu int err = 0; 308360ce86c7SWei Liu V9fsPath new_path; 308460ce86c7SWei Liu V9fsFidState *tfidp; 308560ce86c7SWei Liu V9fsState *s = pdu->s; 308660ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 308760ce86c7SWei Liu 308860ce86c7SWei Liu v9fs_path_init(&new_path); 308960ce86c7SWei Liu if (newdirfid != -1) { 309060ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 309160ce86c7SWei Liu if (dirfidp == NULL) { 3092b858e80aSDaniel Henrique Barboza return -ENOENT; 309360ce86c7SWei Liu } 309449dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 309549dd946bSGreg Kurz err = -EINVAL; 309649dd946bSGreg Kurz goto out; 309749dd946bSGreg Kurz } 30984fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 30994fa62005SGreg Kurz if (err < 0) { 31004fa62005SGreg Kurz goto out; 31014fa62005SGreg Kurz } 310260ce86c7SWei Liu } else { 31034d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31044d8bc733SJan Dakinevich V9fsPath dir_path; 31054d8bc733SJan Dakinevich 31064d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31074d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31084d8bc733SJan Dakinevich g_free(dir_name); 31094d8bc733SJan Dakinevich 31104d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31114d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31124fa62005SGreg Kurz if (err < 0) { 31134fa62005SGreg Kurz goto out; 31144fa62005SGreg Kurz } 311560ce86c7SWei Liu } 311660ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 311760ce86c7SWei Liu if (err < 0) { 311860ce86c7SWei Liu goto out; 311960ce86c7SWei Liu } 312060ce86c7SWei Liu /* 312160ce86c7SWei Liu * Fixup fid's pointing to the old name to 312260ce86c7SWei Liu * start pointing to the new name 312360ce86c7SWei Liu */ 312460ce86c7SWei Liu for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { 312560ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 312660ce86c7SWei Liu /* replace the name */ 312760ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 312860ce86c7SWei Liu } 312960ce86c7SWei Liu } 313060ce86c7SWei Liu out: 313160ce86c7SWei Liu if (dirfidp) { 313260ce86c7SWei Liu put_fid(pdu, dirfidp); 313360ce86c7SWei Liu } 313460ce86c7SWei Liu v9fs_path_free(&new_path); 313560ce86c7SWei Liu return err; 313660ce86c7SWei Liu } 313760ce86c7SWei Liu 313860ce86c7SWei Liu /* Only works with path name based fid */ 31398440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 314060ce86c7SWei Liu { 314160ce86c7SWei Liu int32_t fid; 314260ce86c7SWei Liu ssize_t err = 0; 314360ce86c7SWei Liu size_t offset = 7; 314460ce86c7SWei Liu V9fsString name; 314560ce86c7SWei Liu int32_t newdirfid; 314660ce86c7SWei Liu V9fsFidState *fidp; 314760ce86c7SWei Liu V9fsPDU *pdu = opaque; 314860ce86c7SWei Liu V9fsState *s = pdu->s; 314960ce86c7SWei Liu 315060ce86c7SWei Liu v9fs_string_init(&name); 315160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 315260ce86c7SWei Liu if (err < 0) { 315360ce86c7SWei Liu goto out_nofid; 315460ce86c7SWei Liu } 3155fff39a7aSGreg Kurz 3156fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3157fff39a7aSGreg Kurz err = -ENOENT; 3158fff39a7aSGreg Kurz goto out_nofid; 3159fff39a7aSGreg Kurz } 3160fff39a7aSGreg Kurz 3161805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3162805b5d98SGreg Kurz err = -EISDIR; 3163805b5d98SGreg Kurz goto out_nofid; 3164805b5d98SGreg Kurz } 3165805b5d98SGreg Kurz 316660ce86c7SWei Liu fidp = get_fid(pdu, fid); 316760ce86c7SWei Liu if (fidp == NULL) { 316860ce86c7SWei Liu err = -ENOENT; 316960ce86c7SWei Liu goto out_nofid; 317060ce86c7SWei Liu } 317149dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 317249dd946bSGreg Kurz err = -EINVAL; 317349dd946bSGreg Kurz goto out; 317449dd946bSGreg Kurz } 317560ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 317660ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 317760ce86c7SWei Liu err = -EOPNOTSUPP; 317860ce86c7SWei Liu goto out; 317960ce86c7SWei Liu } 318060ce86c7SWei Liu v9fs_path_write_lock(s); 318160ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 318260ce86c7SWei Liu v9fs_path_unlock(s); 318360ce86c7SWei Liu if (!err) { 318460ce86c7SWei Liu err = offset; 318560ce86c7SWei Liu } 318660ce86c7SWei Liu out: 318760ce86c7SWei Liu put_fid(pdu, fidp); 318860ce86c7SWei Liu out_nofid: 318960ce86c7SWei Liu pdu_complete(pdu, err); 319060ce86c7SWei Liu v9fs_string_free(&name); 319160ce86c7SWei Liu } 319260ce86c7SWei Liu 31934fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 31948440e22eSGreg Kurz V9fsString *old_name, 31958440e22eSGreg Kurz V9fsPath *newdir, 319660ce86c7SWei Liu V9fsString *new_name) 319760ce86c7SWei Liu { 319860ce86c7SWei Liu V9fsFidState *tfidp; 319960ce86c7SWei Liu V9fsPath oldpath, newpath; 320060ce86c7SWei Liu V9fsState *s = pdu->s; 32014fa62005SGreg Kurz int err; 320260ce86c7SWei Liu 320360ce86c7SWei Liu v9fs_path_init(&oldpath); 320460ce86c7SWei Liu v9fs_path_init(&newpath); 32054fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32064fa62005SGreg Kurz if (err < 0) { 32074fa62005SGreg Kurz goto out; 32084fa62005SGreg Kurz } 32094fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32104fa62005SGreg Kurz if (err < 0) { 32114fa62005SGreg Kurz goto out; 32124fa62005SGreg Kurz } 321360ce86c7SWei Liu 321460ce86c7SWei Liu /* 321560ce86c7SWei Liu * Fixup fid's pointing to the old name to 321660ce86c7SWei Liu * start pointing to the new name 321760ce86c7SWei Liu */ 321860ce86c7SWei Liu for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { 321960ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 322060ce86c7SWei Liu /* replace the name */ 322160ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 322260ce86c7SWei Liu } 322360ce86c7SWei Liu } 32244fa62005SGreg Kurz out: 322560ce86c7SWei Liu v9fs_path_free(&oldpath); 322660ce86c7SWei Liu v9fs_path_free(&newpath); 32274fa62005SGreg Kurz return err; 322860ce86c7SWei Liu } 322960ce86c7SWei Liu 32308440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 32318440e22eSGreg Kurz V9fsString *old_name, 32328440e22eSGreg Kurz int32_t newdirfid, 323360ce86c7SWei Liu V9fsString *new_name) 323460ce86c7SWei Liu { 323560ce86c7SWei Liu int err = 0; 323660ce86c7SWei Liu V9fsState *s = pdu->s; 323760ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 323860ce86c7SWei Liu 323960ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 324060ce86c7SWei Liu if (olddirfidp == NULL) { 324160ce86c7SWei Liu err = -ENOENT; 324260ce86c7SWei Liu goto out; 324360ce86c7SWei Liu } 324460ce86c7SWei Liu if (newdirfid != -1) { 324560ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 324660ce86c7SWei Liu if (newdirfidp == NULL) { 324760ce86c7SWei Liu err = -ENOENT; 324860ce86c7SWei Liu goto out; 324960ce86c7SWei Liu } 325060ce86c7SWei Liu } else { 325160ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 325260ce86c7SWei Liu } 325360ce86c7SWei Liu 325460ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 325560ce86c7SWei Liu &newdirfidp->path, new_name); 325660ce86c7SWei Liu if (err < 0) { 325760ce86c7SWei Liu goto out; 325860ce86c7SWei Liu } 325960ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 326060ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 32614fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 326260ce86c7SWei Liu &newdirfidp->path, new_name); 326360ce86c7SWei Liu } 326460ce86c7SWei Liu out: 326560ce86c7SWei Liu if (olddirfidp) { 326660ce86c7SWei Liu put_fid(pdu, olddirfidp); 326760ce86c7SWei Liu } 326860ce86c7SWei Liu if (newdirfidp) { 326960ce86c7SWei Liu put_fid(pdu, newdirfidp); 327060ce86c7SWei Liu } 327160ce86c7SWei Liu return err; 327260ce86c7SWei Liu } 327360ce86c7SWei Liu 32748440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 327560ce86c7SWei Liu { 327660ce86c7SWei Liu ssize_t err = 0; 327760ce86c7SWei Liu size_t offset = 7; 327860ce86c7SWei Liu V9fsPDU *pdu = opaque; 327960ce86c7SWei Liu V9fsState *s = pdu->s; 328060ce86c7SWei Liu int32_t olddirfid, newdirfid; 328160ce86c7SWei Liu V9fsString old_name, new_name; 328260ce86c7SWei Liu 328360ce86c7SWei Liu v9fs_string_init(&old_name); 328460ce86c7SWei Liu v9fs_string_init(&new_name); 328560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 328660ce86c7SWei Liu &old_name, &newdirfid, &new_name); 328760ce86c7SWei Liu if (err < 0) { 328860ce86c7SWei Liu goto out_err; 328960ce86c7SWei Liu } 329060ce86c7SWei Liu 3291fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3292fff39a7aSGreg Kurz err = -ENOENT; 3293fff39a7aSGreg Kurz goto out_err; 3294fff39a7aSGreg Kurz } 3295fff39a7aSGreg Kurz 3296805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3297805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3298805b5d98SGreg Kurz err = -EISDIR; 3299805b5d98SGreg Kurz goto out_err; 3300805b5d98SGreg Kurz } 3301805b5d98SGreg Kurz 330260ce86c7SWei Liu v9fs_path_write_lock(s); 330360ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 330460ce86c7SWei Liu &old_name, newdirfid, &new_name); 330560ce86c7SWei Liu v9fs_path_unlock(s); 330660ce86c7SWei Liu if (!err) { 330760ce86c7SWei Liu err = offset; 330860ce86c7SWei Liu } 330960ce86c7SWei Liu 331060ce86c7SWei Liu out_err: 331160ce86c7SWei Liu pdu_complete(pdu, err); 331260ce86c7SWei Liu v9fs_string_free(&old_name); 331360ce86c7SWei Liu v9fs_string_free(&new_name); 331460ce86c7SWei Liu } 331560ce86c7SWei Liu 33168440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 331760ce86c7SWei Liu { 331860ce86c7SWei Liu int32_t fid; 331960ce86c7SWei Liu int err = 0; 332060ce86c7SWei Liu int16_t unused; 332160ce86c7SWei Liu V9fsStat v9stat; 332260ce86c7SWei Liu size_t offset = 7; 332360ce86c7SWei Liu struct stat stbuf; 332460ce86c7SWei Liu V9fsFidState *fidp; 332560ce86c7SWei Liu V9fsPDU *pdu = opaque; 33261d203986SGreg Kurz V9fsState *s = pdu->s; 332760ce86c7SWei Liu 332860ce86c7SWei Liu v9fs_stat_init(&v9stat); 332960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 333060ce86c7SWei Liu if (err < 0) { 333160ce86c7SWei Liu goto out_nofid; 333260ce86c7SWei Liu } 333360ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 333460ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 333560ce86c7SWei Liu 333660ce86c7SWei Liu fidp = get_fid(pdu, fid); 333760ce86c7SWei Liu if (fidp == NULL) { 333860ce86c7SWei Liu err = -EINVAL; 333960ce86c7SWei Liu goto out_nofid; 334060ce86c7SWei Liu } 334160ce86c7SWei Liu /* do we need to sync the file? */ 334260ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 334360ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 334460ce86c7SWei Liu goto out; 334560ce86c7SWei Liu } 334660ce86c7SWei Liu if (v9stat.mode != -1) { 334760ce86c7SWei Liu uint32_t v9_mode; 334860ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 334960ce86c7SWei Liu if (err < 0) { 335060ce86c7SWei Liu goto out; 335160ce86c7SWei Liu } 335260ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 335360ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 335460ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 335560ce86c7SWei Liu /* Attempting to change the type */ 335660ce86c7SWei Liu err = -EIO; 335760ce86c7SWei Liu goto out; 335860ce86c7SWei Liu } 335960ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 336060ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 336160ce86c7SWei Liu &v9stat.extension)); 336260ce86c7SWei Liu if (err < 0) { 336360ce86c7SWei Liu goto out; 336460ce86c7SWei Liu } 336560ce86c7SWei Liu } 336660ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 336760ce86c7SWei Liu struct timespec times[2]; 336860ce86c7SWei Liu if (v9stat.atime != -1) { 336960ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 337060ce86c7SWei Liu times[0].tv_nsec = 0; 337160ce86c7SWei Liu } else { 337260ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 337360ce86c7SWei Liu } 337460ce86c7SWei Liu if (v9stat.mtime != -1) { 337560ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 337660ce86c7SWei Liu times[1].tv_nsec = 0; 337760ce86c7SWei Liu } else { 337860ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 337960ce86c7SWei Liu } 338060ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 338160ce86c7SWei Liu if (err < 0) { 338260ce86c7SWei Liu goto out; 338360ce86c7SWei Liu } 338460ce86c7SWei Liu } 338560ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 338660ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 338760ce86c7SWei Liu if (err < 0) { 338860ce86c7SWei Liu goto out; 338960ce86c7SWei Liu } 339060ce86c7SWei Liu } 339160ce86c7SWei Liu if (v9stat.name.size != 0) { 33921d203986SGreg Kurz v9fs_path_write_lock(s); 339360ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 33941d203986SGreg Kurz v9fs_path_unlock(s); 339560ce86c7SWei Liu if (err < 0) { 339660ce86c7SWei Liu goto out; 339760ce86c7SWei Liu } 339860ce86c7SWei Liu } 339960ce86c7SWei Liu if (v9stat.length != -1) { 340060ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 340160ce86c7SWei Liu if (err < 0) { 340260ce86c7SWei Liu goto out; 340360ce86c7SWei Liu } 340460ce86c7SWei Liu } 340560ce86c7SWei Liu err = offset; 340660ce86c7SWei Liu out: 340760ce86c7SWei Liu put_fid(pdu, fidp); 340860ce86c7SWei Liu out_nofid: 340960ce86c7SWei Liu v9fs_stat_free(&v9stat); 341060ce86c7SWei Liu pdu_complete(pdu, err); 341160ce86c7SWei Liu } 341260ce86c7SWei Liu 341360ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 341460ce86c7SWei Liu { 341560ce86c7SWei Liu uint32_t f_type; 341660ce86c7SWei Liu uint32_t f_bsize; 341760ce86c7SWei Liu uint64_t f_blocks; 341860ce86c7SWei Liu uint64_t f_bfree; 341960ce86c7SWei Liu uint64_t f_bavail; 342060ce86c7SWei Liu uint64_t f_files; 342160ce86c7SWei Liu uint64_t f_ffree; 342260ce86c7SWei Liu uint64_t fsid_val; 342360ce86c7SWei Liu uint32_t f_namelen; 342460ce86c7SWei Liu size_t offset = 7; 342560ce86c7SWei Liu int32_t bsize_factor; 342660ce86c7SWei Liu 342760ce86c7SWei Liu /* 342860ce86c7SWei Liu * compute bsize factor based on host file system block size 342960ce86c7SWei Liu * and client msize 343060ce86c7SWei Liu */ 343160ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 343260ce86c7SWei Liu if (!bsize_factor) { 343360ce86c7SWei Liu bsize_factor = 1; 343460ce86c7SWei Liu } 343560ce86c7SWei Liu f_type = stbuf->f_type; 343660ce86c7SWei Liu f_bsize = stbuf->f_bsize; 343760ce86c7SWei Liu f_bsize *= bsize_factor; 343860ce86c7SWei Liu /* 343960ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 344060ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 344160ce86c7SWei Liu * blocks by bsize factor 344260ce86c7SWei Liu */ 344360ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 344460ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 344560ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 344660ce86c7SWei Liu f_files = stbuf->f_files; 344760ce86c7SWei Liu f_ffree = stbuf->f_ffree; 344860ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 344960ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 345060ce86c7SWei Liu f_namelen = stbuf->f_namelen; 345160ce86c7SWei Liu 345260ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 345360ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 345460ce86c7SWei Liu f_bavail, f_files, f_ffree, 345560ce86c7SWei Liu fsid_val, f_namelen); 345660ce86c7SWei Liu } 345760ce86c7SWei Liu 34588440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 345960ce86c7SWei Liu { 346060ce86c7SWei Liu int32_t fid; 346160ce86c7SWei Liu ssize_t retval = 0; 346260ce86c7SWei Liu size_t offset = 7; 346360ce86c7SWei Liu V9fsFidState *fidp; 346460ce86c7SWei Liu struct statfs stbuf; 346560ce86c7SWei Liu V9fsPDU *pdu = opaque; 346660ce86c7SWei Liu V9fsState *s = pdu->s; 346760ce86c7SWei Liu 346860ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 346960ce86c7SWei Liu if (retval < 0) { 347060ce86c7SWei Liu goto out_nofid; 347160ce86c7SWei Liu } 347260ce86c7SWei Liu fidp = get_fid(pdu, fid); 347360ce86c7SWei Liu if (fidp == NULL) { 347460ce86c7SWei Liu retval = -ENOENT; 347560ce86c7SWei Liu goto out_nofid; 347660ce86c7SWei Liu } 347760ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 347860ce86c7SWei Liu if (retval < 0) { 347960ce86c7SWei Liu goto out; 348060ce86c7SWei Liu } 348160ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 348260ce86c7SWei Liu if (retval < 0) { 348360ce86c7SWei Liu goto out; 348460ce86c7SWei Liu } 348560ce86c7SWei Liu retval += offset; 348660ce86c7SWei Liu out: 348760ce86c7SWei Liu put_fid(pdu, fidp); 348860ce86c7SWei Liu out_nofid: 348960ce86c7SWei Liu pdu_complete(pdu, retval); 349060ce86c7SWei Liu } 349160ce86c7SWei Liu 34928440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 349360ce86c7SWei Liu { 349460ce86c7SWei Liu 349560ce86c7SWei Liu int mode; 349660ce86c7SWei Liu gid_t gid; 349760ce86c7SWei Liu int32_t fid; 349860ce86c7SWei Liu V9fsQID qid; 349960ce86c7SWei Liu int err = 0; 350060ce86c7SWei Liu int major, minor; 350160ce86c7SWei Liu size_t offset = 7; 350260ce86c7SWei Liu V9fsString name; 350360ce86c7SWei Liu struct stat stbuf; 350460ce86c7SWei Liu V9fsFidState *fidp; 350560ce86c7SWei Liu V9fsPDU *pdu = opaque; 350660ce86c7SWei Liu 350760ce86c7SWei Liu v9fs_string_init(&name); 350860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 350960ce86c7SWei Liu &major, &minor, &gid); 351060ce86c7SWei Liu if (err < 0) { 351160ce86c7SWei Liu goto out_nofid; 351260ce86c7SWei Liu } 351360ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 351460ce86c7SWei Liu 3515fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3516fff39a7aSGreg Kurz err = -ENOENT; 3517fff39a7aSGreg Kurz goto out_nofid; 3518fff39a7aSGreg Kurz } 3519fff39a7aSGreg Kurz 3520805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3521805b5d98SGreg Kurz err = -EEXIST; 3522805b5d98SGreg Kurz goto out_nofid; 3523805b5d98SGreg Kurz } 3524805b5d98SGreg Kurz 352560ce86c7SWei Liu fidp = get_fid(pdu, fid); 352660ce86c7SWei Liu if (fidp == NULL) { 352760ce86c7SWei Liu err = -ENOENT; 352860ce86c7SWei Liu goto out_nofid; 352960ce86c7SWei Liu } 353060ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 353160ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 353260ce86c7SWei Liu if (err < 0) { 353360ce86c7SWei Liu goto out; 353460ce86c7SWei Liu } 35353b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 35363b5ee9e8SAntonios Motakis if (err < 0) { 35373b5ee9e8SAntonios Motakis goto out; 35383b5ee9e8SAntonios Motakis } 353960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 354060ce86c7SWei Liu if (err < 0) { 354160ce86c7SWei Liu goto out; 354260ce86c7SWei Liu } 354360ce86c7SWei Liu err += offset; 354460ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 354560ce86c7SWei Liu qid.type, qid.version, qid.path); 354660ce86c7SWei Liu out: 354760ce86c7SWei Liu put_fid(pdu, fidp); 354860ce86c7SWei Liu out_nofid: 354960ce86c7SWei Liu pdu_complete(pdu, err); 355060ce86c7SWei Liu v9fs_string_free(&name); 355160ce86c7SWei Liu } 355260ce86c7SWei Liu 355360ce86c7SWei Liu /* 355460ce86c7SWei Liu * Implement posix byte range locking code 355560ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 355660ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 355760ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 355860ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 355960ce86c7SWei Liu * So when a TLOCK request comes, always return success 356060ce86c7SWei Liu */ 35618440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 356260ce86c7SWei Liu { 356360ce86c7SWei Liu V9fsFlock flock; 356460ce86c7SWei Liu size_t offset = 7; 356560ce86c7SWei Liu struct stat stbuf; 356660ce86c7SWei Liu V9fsFidState *fidp; 356760ce86c7SWei Liu int32_t fid, err = 0; 356860ce86c7SWei Liu V9fsPDU *pdu = opaque; 356960ce86c7SWei Liu 357060ce86c7SWei Liu v9fs_string_init(&flock.client_id); 357160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 357260ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 357360ce86c7SWei Liu &flock.proc_id, &flock.client_id); 357460ce86c7SWei Liu if (err < 0) { 357560ce86c7SWei Liu goto out_nofid; 357660ce86c7SWei Liu } 357760ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 357860ce86c7SWei Liu flock.type, flock.start, flock.length); 357960ce86c7SWei Liu 358060ce86c7SWei Liu 358160ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 358260ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 358360ce86c7SWei Liu err = -EINVAL; 358460ce86c7SWei Liu goto out_nofid; 358560ce86c7SWei Liu } 358660ce86c7SWei Liu fidp = get_fid(pdu, fid); 358760ce86c7SWei Liu if (fidp == NULL) { 358860ce86c7SWei Liu err = -ENOENT; 358960ce86c7SWei Liu goto out_nofid; 359060ce86c7SWei Liu } 359160ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 359260ce86c7SWei Liu if (err < 0) { 359360ce86c7SWei Liu goto out; 359460ce86c7SWei Liu } 35954bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 35964bae2b39SPaolo Bonzini if (err < 0) { 35974bae2b39SPaolo Bonzini goto out; 35984bae2b39SPaolo Bonzini } 35994bae2b39SPaolo Bonzini err += offset; 36004bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 360160ce86c7SWei Liu out: 360260ce86c7SWei Liu put_fid(pdu, fidp); 360360ce86c7SWei Liu out_nofid: 360460ce86c7SWei Liu pdu_complete(pdu, err); 360560ce86c7SWei Liu v9fs_string_free(&flock.client_id); 360660ce86c7SWei Liu } 360760ce86c7SWei Liu 360860ce86c7SWei Liu /* 360960ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 361060ce86c7SWei Liu * handling is done by client's VFS layer. 361160ce86c7SWei Liu */ 36128440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 361360ce86c7SWei Liu { 361460ce86c7SWei Liu size_t offset = 7; 361560ce86c7SWei Liu struct stat stbuf; 361660ce86c7SWei Liu V9fsFidState *fidp; 361760ce86c7SWei Liu V9fsGetlock glock; 361860ce86c7SWei Liu int32_t fid, err = 0; 361960ce86c7SWei Liu V9fsPDU *pdu = opaque; 362060ce86c7SWei Liu 362160ce86c7SWei Liu v9fs_string_init(&glock.client_id); 362260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 362360ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 362460ce86c7SWei Liu &glock.client_id); 362560ce86c7SWei Liu if (err < 0) { 362660ce86c7SWei Liu goto out_nofid; 362760ce86c7SWei Liu } 362860ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 362960ce86c7SWei Liu glock.type, glock.start, glock.length); 363060ce86c7SWei Liu 363160ce86c7SWei Liu fidp = get_fid(pdu, fid); 363260ce86c7SWei Liu if (fidp == NULL) { 363360ce86c7SWei Liu err = -ENOENT; 363460ce86c7SWei Liu goto out_nofid; 363560ce86c7SWei Liu } 363660ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 363760ce86c7SWei Liu if (err < 0) { 363860ce86c7SWei Liu goto out; 363960ce86c7SWei Liu } 364060ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 364160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 364260ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 364360ce86c7SWei Liu &glock.client_id); 364460ce86c7SWei Liu if (err < 0) { 364560ce86c7SWei Liu goto out; 364660ce86c7SWei Liu } 364760ce86c7SWei Liu err += offset; 364860ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 364960ce86c7SWei Liu glock.length, glock.proc_id); 365060ce86c7SWei Liu out: 365160ce86c7SWei Liu put_fid(pdu, fidp); 365260ce86c7SWei Liu out_nofid: 365360ce86c7SWei Liu pdu_complete(pdu, err); 365460ce86c7SWei Liu v9fs_string_free(&glock.client_id); 365560ce86c7SWei Liu } 365660ce86c7SWei Liu 36578440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 365860ce86c7SWei Liu { 365960ce86c7SWei Liu V9fsPDU *pdu = opaque; 366060ce86c7SWei Liu size_t offset = 7; 366160ce86c7SWei Liu int32_t fid; 366260ce86c7SWei Liu struct stat stbuf; 366360ce86c7SWei Liu V9fsQID qid; 366460ce86c7SWei Liu V9fsString name; 366560ce86c7SWei Liu V9fsFidState *fidp; 366660ce86c7SWei Liu gid_t gid; 366760ce86c7SWei Liu int mode; 366860ce86c7SWei Liu int err = 0; 366960ce86c7SWei Liu 367060ce86c7SWei Liu v9fs_string_init(&name); 367160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 367260ce86c7SWei Liu if (err < 0) { 367360ce86c7SWei Liu goto out_nofid; 367460ce86c7SWei Liu } 367560ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 367660ce86c7SWei Liu 3677fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3678fff39a7aSGreg Kurz err = -ENOENT; 3679fff39a7aSGreg Kurz goto out_nofid; 3680fff39a7aSGreg Kurz } 3681fff39a7aSGreg Kurz 3682805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3683805b5d98SGreg Kurz err = -EEXIST; 3684805b5d98SGreg Kurz goto out_nofid; 3685805b5d98SGreg Kurz } 3686805b5d98SGreg Kurz 368760ce86c7SWei Liu fidp = get_fid(pdu, fid); 368860ce86c7SWei Liu if (fidp == NULL) { 368960ce86c7SWei Liu err = -ENOENT; 369060ce86c7SWei Liu goto out_nofid; 369160ce86c7SWei Liu } 369260ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 369360ce86c7SWei Liu if (err < 0) { 369460ce86c7SWei Liu goto out; 369560ce86c7SWei Liu } 36963b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36973b5ee9e8SAntonios Motakis if (err < 0) { 36983b5ee9e8SAntonios Motakis goto out; 36993b5ee9e8SAntonios Motakis } 370060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 370160ce86c7SWei Liu if (err < 0) { 370260ce86c7SWei Liu goto out; 370360ce86c7SWei Liu } 370460ce86c7SWei Liu err += offset; 370560ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 370660ce86c7SWei Liu qid.type, qid.version, qid.path, err); 370760ce86c7SWei Liu out: 370860ce86c7SWei Liu put_fid(pdu, fidp); 370960ce86c7SWei Liu out_nofid: 371060ce86c7SWei Liu pdu_complete(pdu, err); 371160ce86c7SWei Liu v9fs_string_free(&name); 371260ce86c7SWei Liu } 371360ce86c7SWei Liu 37148440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 371560ce86c7SWei Liu { 371660ce86c7SWei Liu int64_t size; 371760ce86c7SWei Liu V9fsString name; 371860ce86c7SWei Liu ssize_t err = 0; 371960ce86c7SWei Liu size_t offset = 7; 372060ce86c7SWei Liu int32_t fid, newfid; 372160ce86c7SWei Liu V9fsFidState *file_fidp; 372260ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 372360ce86c7SWei Liu V9fsPDU *pdu = opaque; 372460ce86c7SWei Liu V9fsState *s = pdu->s; 372560ce86c7SWei Liu 372660ce86c7SWei Liu v9fs_string_init(&name); 372760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 372860ce86c7SWei Liu if (err < 0) { 372960ce86c7SWei Liu goto out_nofid; 373060ce86c7SWei Liu } 373160ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 373260ce86c7SWei Liu 373360ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 373460ce86c7SWei Liu if (file_fidp == NULL) { 373560ce86c7SWei Liu err = -ENOENT; 373660ce86c7SWei Liu goto out_nofid; 373760ce86c7SWei Liu } 373860ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 373960ce86c7SWei Liu if (xattr_fidp == NULL) { 374060ce86c7SWei Liu err = -EINVAL; 374160ce86c7SWei Liu goto out; 374260ce86c7SWei Liu } 374360ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3744ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 374560ce86c7SWei Liu /* 374660ce86c7SWei Liu * listxattr request. Get the size first 374760ce86c7SWei Liu */ 374860ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 374960ce86c7SWei Liu if (size < 0) { 375060ce86c7SWei Liu err = size; 375160ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 375260ce86c7SWei Liu goto out; 375360ce86c7SWei Liu } 375460ce86c7SWei Liu /* 375560ce86c7SWei Liu * Read the xattr value 375660ce86c7SWei Liu */ 375760ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 375860ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3759dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37607bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3761a647502cSKeno Fischer if (size) { 376260ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 376360ce86c7SWei Liu xattr_fidp->fs.xattr.value, 376460ce86c7SWei Liu xattr_fidp->fs.xattr.len); 376560ce86c7SWei Liu if (err < 0) { 376660ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 376760ce86c7SWei Liu goto out; 376860ce86c7SWei Liu } 376960ce86c7SWei Liu } 377060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 377160ce86c7SWei Liu if (err < 0) { 377260ce86c7SWei Liu goto out; 377360ce86c7SWei Liu } 377460ce86c7SWei Liu err += offset; 377560ce86c7SWei Liu } else { 377660ce86c7SWei Liu /* 377760ce86c7SWei Liu * specific xattr fid. We check for xattr 377860ce86c7SWei Liu * presence also collect the xattr size 377960ce86c7SWei Liu */ 378060ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 378160ce86c7SWei Liu &name, NULL, 0); 378260ce86c7SWei Liu if (size < 0) { 378360ce86c7SWei Liu err = size; 378460ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 378560ce86c7SWei Liu goto out; 378660ce86c7SWei Liu } 378760ce86c7SWei Liu /* 378860ce86c7SWei Liu * Read the xattr value 378960ce86c7SWei Liu */ 379060ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 379160ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3792dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37937bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3794a647502cSKeno Fischer if (size) { 379560ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 379660ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 379760ce86c7SWei Liu xattr_fidp->fs.xattr.len); 379860ce86c7SWei Liu if (err < 0) { 379960ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 380060ce86c7SWei Liu goto out; 380160ce86c7SWei Liu } 380260ce86c7SWei Liu } 380360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 380460ce86c7SWei Liu if (err < 0) { 380560ce86c7SWei Liu goto out; 380660ce86c7SWei Liu } 380760ce86c7SWei Liu err += offset; 380860ce86c7SWei Liu } 380960ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 381060ce86c7SWei Liu out: 381160ce86c7SWei Liu put_fid(pdu, file_fidp); 381260ce86c7SWei Liu if (xattr_fidp) { 381360ce86c7SWei Liu put_fid(pdu, xattr_fidp); 381460ce86c7SWei Liu } 381560ce86c7SWei Liu out_nofid: 381660ce86c7SWei Liu pdu_complete(pdu, err); 381760ce86c7SWei Liu v9fs_string_free(&name); 381860ce86c7SWei Liu } 381960ce86c7SWei Liu 38208440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 382160ce86c7SWei Liu { 3822aca6897fSKeno Fischer int flags, rflags = 0; 382360ce86c7SWei Liu int32_t fid; 38243b79ef2cSGreg Kurz uint64_t size; 382560ce86c7SWei Liu ssize_t err = 0; 382660ce86c7SWei Liu V9fsString name; 382760ce86c7SWei Liu size_t offset = 7; 382860ce86c7SWei Liu V9fsFidState *file_fidp; 382960ce86c7SWei Liu V9fsFidState *xattr_fidp; 383060ce86c7SWei Liu V9fsPDU *pdu = opaque; 383160ce86c7SWei Liu 383260ce86c7SWei Liu v9fs_string_init(&name); 383360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 383460ce86c7SWei Liu if (err < 0) { 383560ce86c7SWei Liu goto out_nofid; 383660ce86c7SWei Liu } 383760ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 383860ce86c7SWei Liu 3839aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3840aca6897fSKeno Fischer err = -EINVAL; 3841aca6897fSKeno Fischer goto out_nofid; 3842aca6897fSKeno Fischer } 3843aca6897fSKeno Fischer 3844aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3845aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3846aca6897fSKeno Fischer } 3847aca6897fSKeno Fischer 3848aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3849aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3850aca6897fSKeno Fischer } 3851aca6897fSKeno Fischer 38523b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 38533b79ef2cSGreg Kurz err = -E2BIG; 38543b79ef2cSGreg Kurz goto out_nofid; 38553b79ef2cSGreg Kurz } 38563b79ef2cSGreg Kurz 385760ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 385860ce86c7SWei Liu if (file_fidp == NULL) { 385960ce86c7SWei Liu err = -EINVAL; 386060ce86c7SWei Liu goto out_nofid; 386160ce86c7SWei Liu } 3862dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3863dd654e03SGreg Kurz err = -EINVAL; 3864dd654e03SGreg Kurz goto out_put_fid; 3865dd654e03SGreg Kurz } 3866dd654e03SGreg Kurz 386760ce86c7SWei Liu /* Make the file fid point to xattr */ 386860ce86c7SWei Liu xattr_fidp = file_fidp; 386960ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 387060ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3871dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 387260ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3873aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 387460ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 387560ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3876eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 387760ce86c7SWei Liu err = offset; 3878dd654e03SGreg Kurz out_put_fid: 387960ce86c7SWei Liu put_fid(pdu, file_fidp); 388060ce86c7SWei Liu out_nofid: 388160ce86c7SWei Liu pdu_complete(pdu, err); 388260ce86c7SWei Liu v9fs_string_free(&name); 388360ce86c7SWei Liu } 388460ce86c7SWei Liu 38858440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 388660ce86c7SWei Liu { 388760ce86c7SWei Liu V9fsPDU *pdu = opaque; 388860ce86c7SWei Liu size_t offset = 7; 388960ce86c7SWei Liu V9fsString target; 389060ce86c7SWei Liu int32_t fid; 389160ce86c7SWei Liu int err = 0; 389260ce86c7SWei Liu V9fsFidState *fidp; 389360ce86c7SWei Liu 389460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 389560ce86c7SWei Liu if (err < 0) { 389660ce86c7SWei Liu goto out_nofid; 389760ce86c7SWei Liu } 389860ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 389960ce86c7SWei Liu fidp = get_fid(pdu, fid); 390060ce86c7SWei Liu if (fidp == NULL) { 390160ce86c7SWei Liu err = -ENOENT; 390260ce86c7SWei Liu goto out_nofid; 390360ce86c7SWei Liu } 390460ce86c7SWei Liu 390560ce86c7SWei Liu v9fs_string_init(&target); 390660ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 390760ce86c7SWei Liu if (err < 0) { 390860ce86c7SWei Liu goto out; 390960ce86c7SWei Liu } 391060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 391160ce86c7SWei Liu if (err < 0) { 391260ce86c7SWei Liu v9fs_string_free(&target); 391360ce86c7SWei Liu goto out; 391460ce86c7SWei Liu } 391560ce86c7SWei Liu err += offset; 391660ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 391760ce86c7SWei Liu v9fs_string_free(&target); 391860ce86c7SWei Liu out: 391960ce86c7SWei Liu put_fid(pdu, fidp); 392060ce86c7SWei Liu out_nofid: 392160ce86c7SWei Liu pdu_complete(pdu, err); 392260ce86c7SWei Liu } 392360ce86c7SWei Liu 392460ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 392560ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 392660ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 392760ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 392860ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 392960ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 393060ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 393160ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 393260ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 393360ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 393460ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 393560ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 393660ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 393760ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 393860ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 393960ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 394060ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 394160ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 394260ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 394360ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 394460ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 394560ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 394660ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 394760ce86c7SWei Liu [P9_TREAD] = v9fs_read, 394860ce86c7SWei Liu #if 0 394960ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 395060ce86c7SWei Liu #endif 395160ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 395260ce86c7SWei Liu [P9_TLINK] = v9fs_link, 395360ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 395460ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 395560ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 395660ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 395760ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 395860ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 395960ce86c7SWei Liu }; 396060ce86c7SWei Liu 39618440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 396260ce86c7SWei Liu { 396360ce86c7SWei Liu V9fsPDU *pdu = opaque; 396460ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 396560ce86c7SWei Liu } 396660ce86c7SWei Liu 39678440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 396860ce86c7SWei Liu { 396960ce86c7SWei Liu V9fsPDU *pdu = opaque; 397060ce86c7SWei Liu pdu_complete(pdu, -EROFS); 397160ce86c7SWei Liu } 397260ce86c7SWei Liu 397360ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 397460ce86c7SWei Liu { 397560ce86c7SWei Liu switch (pdu->id) { 397660ce86c7SWei Liu case P9_TREADDIR: 397760ce86c7SWei Liu case P9_TSTATFS: 397860ce86c7SWei Liu case P9_TGETATTR: 397960ce86c7SWei Liu case P9_TXATTRWALK: 398060ce86c7SWei Liu case P9_TLOCK: 398160ce86c7SWei Liu case P9_TGETLOCK: 398260ce86c7SWei Liu case P9_TREADLINK: 398360ce86c7SWei Liu case P9_TVERSION: 398460ce86c7SWei Liu case P9_TLOPEN: 398560ce86c7SWei Liu case P9_TATTACH: 398660ce86c7SWei Liu case P9_TSTAT: 398760ce86c7SWei Liu case P9_TWALK: 398860ce86c7SWei Liu case P9_TCLUNK: 398960ce86c7SWei Liu case P9_TFSYNC: 399060ce86c7SWei Liu case P9_TOPEN: 399160ce86c7SWei Liu case P9_TREAD: 399260ce86c7SWei Liu case P9_TAUTH: 399360ce86c7SWei Liu case P9_TFLUSH: 399460ce86c7SWei Liu return 1; 399560ce86c7SWei Liu default: 399660ce86c7SWei Liu return 0; 399760ce86c7SWei Liu } 399860ce86c7SWei Liu } 399960ce86c7SWei Liu 4000506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 400160ce86c7SWei Liu { 400260ce86c7SWei Liu Coroutine *co; 400360ce86c7SWei Liu CoroutineEntry *handler; 400460ce86c7SWei Liu V9fsState *s = pdu->s; 400560ce86c7SWei Liu 4006506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4007506f3275SGreg Kurz pdu->id = hdr->id; 4008506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4009506f3275SGreg Kurz 401060ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 401160ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 401260ce86c7SWei Liu handler = v9fs_op_not_supp; 4013d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4014d1471233SGreg Kurz handler = v9fs_fs_ro; 401560ce86c7SWei Liu } else { 401660ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 401760ce86c7SWei Liu } 401860ce86c7SWei Liu 4019506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 40200b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 40210b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 402260ce86c7SWei Liu } 402360ce86c7SWei Liu 40242a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4025066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4026066eb006SGreg Kurz Error **errp) 40272a0c56aaSWei Liu { 402892c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 40292a0c56aaSWei Liu int i, len; 40302a0c56aaSWei Liu struct stat stat; 40312a0c56aaSWei Liu FsDriverEntry *fse; 40322a0c56aaSWei Liu V9fsPath path; 40332a0c56aaSWei Liu int rc = 1; 40342a0c56aaSWei Liu 4035066eb006SGreg Kurz assert(!s->transport); 4036066eb006SGreg Kurz s->transport = t; 4037066eb006SGreg Kurz 40382a0c56aaSWei Liu /* initialize pdu allocator */ 40392a0c56aaSWei Liu QLIST_INIT(&s->free_list); 40402a0c56aaSWei Liu QLIST_INIT(&s->active_list); 40410d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4042583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4043583f21f8SStefano Stabellini s->pdus[i].s = s; 4044583f21f8SStefano Stabellini s->pdus[i].idx = i; 40452a0c56aaSWei Liu } 40462a0c56aaSWei Liu 40472a0c56aaSWei Liu v9fs_path_init(&path); 40482a0c56aaSWei Liu 40492a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 40502a0c56aaSWei Liu 40512a0c56aaSWei Liu if (!fse) { 40522a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 40532a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 40542a0c56aaSWei Liu "id = %s", 40552a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 40562a0c56aaSWei Liu goto out; 40572a0c56aaSWei Liu } 40582a0c56aaSWei Liu 40592a0c56aaSWei Liu if (!s->fsconf.tag) { 40602a0c56aaSWei Liu /* we haven't specified a mount_tag */ 40612a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 40622a0c56aaSWei Liu s->fsconf.fsdev_id); 40632a0c56aaSWei Liu goto out; 40642a0c56aaSWei Liu } 40652a0c56aaSWei Liu 40662a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 40672a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 40682a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 40692a0c56aaSWei Liu len = strlen(s->fsconf.tag); 40702a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 40712a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 40722a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 40732a0c56aaSWei Liu goto out; 40742a0c56aaSWei Liu } 40752a0c56aaSWei Liu 40762a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 40772a0c56aaSWei Liu s->ctx.uid = -1; 40782a0c56aaSWei Liu 40792a0c56aaSWei Liu s->ops = fse->ops; 40802a0c56aaSWei Liu 4081b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4082b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4083b96feb2cSTobias Schramm 40842a0c56aaSWei Liu s->fid_list = NULL; 40852a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 40862a0c56aaSWei Liu 408765603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 408865603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 408965603a80SGreg Kurz s->fsconf.fsdev_id); 40902a0c56aaSWei Liu goto out; 40912a0c56aaSWei Liu } 40922a0c56aaSWei Liu 40932a0c56aaSWei Liu /* 40942a0c56aaSWei Liu * Check details of export path, We need to use fs driver 40952a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 40962a0c56aaSWei Liu * use co-routines here. 40972a0c56aaSWei Liu */ 40982a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 40992a0c56aaSWei Liu error_setg(errp, 41002a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 41012a0c56aaSWei Liu goto out; 41022a0c56aaSWei Liu } 41032a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41042a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41052a0c56aaSWei Liu goto out; 41062a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41072a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41082a0c56aaSWei Liu goto out; 41092a0c56aaSWei Liu } 4110b8bbdb88SPradeep Jagadeesh 41113b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41123b5ee9e8SAntonios Motakis 41136b6aa828SChristian Schoenebeck /* init inode remapping : */ 41146b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 41156b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 41166b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 41176b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 41186b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 41191a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 41206b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 41216b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4122f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 41231a6ed33cSAntonios Motakis 4124b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4125b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4126b8bbdb88SPradeep Jagadeesh 41272a0c56aaSWei Liu rc = 0; 41282a0c56aaSWei Liu out: 41292a0c56aaSWei Liu if (rc) { 4130b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4131702dbcc2SLi Qiang } 41322a0c56aaSWei Liu v9fs_path_free(&path); 41332a0c56aaSWei Liu return rc; 41342a0c56aaSWei Liu } 41352a0c56aaSWei Liu 4136b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 41372a0c56aaSWei Liu { 4138c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4139702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4140702dbcc2SLi Qiang } 4141c0da0cb7SGreg Kurz if (s->ctx.fst) { 4142b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4143c0da0cb7SGreg Kurz } 41442a0c56aaSWei Liu g_free(s->tag); 41456b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4146f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4147f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 41484774718eSLi Qiang g_free(s->ctx.fs_root); 41492a0c56aaSWei Liu } 41502a0c56aaSWei Liu 41510e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 41520e44a0fdSGreg Kurz V9fsPDU pdu; 41530e44a0fdSGreg Kurz bool done; 41540e44a0fdSGreg Kurz } VirtfsCoResetData; 41550e44a0fdSGreg Kurz 41560e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 41570e44a0fdSGreg Kurz { 41580e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 41590e44a0fdSGreg Kurz 41600e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 41610e44a0fdSGreg Kurz data->done = true; 41620e44a0fdSGreg Kurz } 41630e44a0fdSGreg Kurz 41640e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 41650e44a0fdSGreg Kurz { 41660e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 41670e44a0fdSGreg Kurz Coroutine *co; 41680e44a0fdSGreg Kurz 41690e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 41700e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41710e44a0fdSGreg Kurz } 41720e44a0fdSGreg Kurz 41730e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 41740e44a0fdSGreg Kurz qemu_coroutine_enter(co); 41750e44a0fdSGreg Kurz 41760e44a0fdSGreg Kurz while (!data.done) { 41770e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41780e44a0fdSGreg Kurz } 41790e44a0fdSGreg Kurz } 41800e44a0fdSGreg Kurz 418160ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 418260ce86c7SWei Liu { 418360ce86c7SWei Liu struct rlimit rlim; 418460ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 418563325b18SGreg Kurz error_report("Failed to get the resource limit"); 418660ce86c7SWei Liu exit(1); 418760ce86c7SWei Liu } 418860ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 418960ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 419060ce86c7SWei Liu } 4191