160ce86c7SWei Liu /* 260ce86c7SWei Liu * Virtio 9p backend 360ce86c7SWei Liu * 460ce86c7SWei Liu * Copyright IBM, Corp. 2010 560ce86c7SWei Liu * 660ce86c7SWei Liu * Authors: 760ce86c7SWei Liu * Anthony Liguori <aliguori@us.ibm.com> 860ce86c7SWei Liu * 960ce86c7SWei Liu * This work is licensed under the terms of the GNU GPL, version 2. See 1060ce86c7SWei Liu * the COPYING file in the top-level directory. 1160ce86c7SWei Liu * 1260ce86c7SWei Liu */ 1360ce86c7SWei Liu 146f569084SChristian Schoenebeck /* 156f569084SChristian Schoenebeck * Not so fast! You might want to read the 9p developer docs first: 166f569084SChristian Schoenebeck * https://wiki.qemu.org/Documentation/9p 176f569084SChristian Schoenebeck */ 186f569084SChristian Schoenebeck 19fbc04127SPeter Maydell #include "qemu/osdep.h" 20e3e83f2eSGreg Kurz #include <glib/gprintf.h> 2160ce86c7SWei Liu #include "hw/virtio/virtio.h" 22da34e65cSMarkus Armbruster #include "qapi/error.h" 2360ce86c7SWei Liu #include "qemu/error-report.h" 2460ce86c7SWei Liu #include "qemu/iov.h" 25db725815SMarkus Armbruster #include "qemu/main-loop.h" 2660ce86c7SWei Liu #include "qemu/sockets.h" 2760ce86c7SWei Liu #include "virtio-9p.h" 2860ce86c7SWei Liu #include "fsdev/qemu-fsdev.h" 2960ce86c7SWei Liu #include "9p-xattr.h" 3060ce86c7SWei Liu #include "coth.h" 3160ce86c7SWei Liu #include "trace.h" 32795c40b8SJuan Quintela #include "migration/blocker.h" 331a6ed33cSAntonios Motakis #include "qemu/xxhash.h" 346b6aa828SChristian Schoenebeck #include <math.h> 3503556ea9SDan Robertson #include <linux/limits.h> 3660ce86c7SWei Liu 3760ce86c7SWei Liu int open_fd_hw; 3860ce86c7SWei Liu int total_open_fd; 3960ce86c7SWei Liu static int open_fd_rc; 4060ce86c7SWei Liu 4160ce86c7SWei Liu enum { 4260ce86c7SWei Liu Oread = 0x00, 4360ce86c7SWei Liu Owrite = 0x01, 4460ce86c7SWei Liu Ordwr = 0x02, 4560ce86c7SWei Liu Oexec = 0x03, 4660ce86c7SWei Liu Oexcl = 0x04, 4760ce86c7SWei Liu Otrunc = 0x10, 4860ce86c7SWei Liu Orexec = 0x20, 4960ce86c7SWei Liu Orclose = 0x40, 5060ce86c7SWei Liu Oappend = 0x80, 5160ce86c7SWei Liu }; 5260ce86c7SWei Liu 5375673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 5460ce86c7SWei Liu { 5560ce86c7SWei Liu ssize_t ret; 5660ce86c7SWei Liu va_list ap; 5760ce86c7SWei Liu 5860ce86c7SWei Liu va_start(ap, fmt); 59ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 6060ce86c7SWei Liu va_end(ap); 6160ce86c7SWei Liu 6260ce86c7SWei Liu return ret; 6360ce86c7SWei Liu } 6460ce86c7SWei Liu 6575673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 6660ce86c7SWei Liu { 6760ce86c7SWei Liu ssize_t ret; 6860ce86c7SWei Liu va_list ap; 6960ce86c7SWei Liu 7060ce86c7SWei Liu va_start(ap, fmt); 71ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 7260ce86c7SWei Liu va_end(ap); 7360ce86c7SWei Liu 7460ce86c7SWei Liu return ret; 7560ce86c7SWei Liu } 7660ce86c7SWei Liu 7760ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 7860ce86c7SWei Liu { 7960ce86c7SWei Liu int ret = 0; 8060ce86c7SWei Liu 8160ce86c7SWei Liu switch (mode & 3) { 8260ce86c7SWei Liu case Oread: 8360ce86c7SWei Liu ret = O_RDONLY; 8460ce86c7SWei Liu break; 8560ce86c7SWei Liu case Ordwr: 8660ce86c7SWei Liu ret = O_RDWR; 8760ce86c7SWei Liu break; 8860ce86c7SWei Liu case Owrite: 8960ce86c7SWei Liu ret = O_WRONLY; 9060ce86c7SWei Liu break; 9160ce86c7SWei Liu case Oexec: 9260ce86c7SWei Liu ret = O_RDONLY; 9360ce86c7SWei Liu break; 9460ce86c7SWei Liu } 9560ce86c7SWei Liu 9660ce86c7SWei Liu if (mode & Otrunc) { 9760ce86c7SWei Liu ret |= O_TRUNC; 9860ce86c7SWei Liu } 9960ce86c7SWei Liu 10060ce86c7SWei Liu if (mode & Oappend) { 10160ce86c7SWei Liu ret |= O_APPEND; 10260ce86c7SWei Liu } 10360ce86c7SWei Liu 10460ce86c7SWei Liu if (mode & Oexcl) { 10560ce86c7SWei Liu ret |= O_EXCL; 10660ce86c7SWei Liu } 10760ce86c7SWei Liu 10860ce86c7SWei Liu return ret; 10960ce86c7SWei Liu } 11060ce86c7SWei Liu 1118e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 11260ce86c7SWei Liu int dotl_flag; 11360ce86c7SWei Liu int open_flag; 1148e71b96cSGreg Kurz } DotlOpenflagMap; 11560ce86c7SWei Liu 11660ce86c7SWei Liu static int dotl_to_open_flags(int flags) 11760ce86c7SWei Liu { 11860ce86c7SWei Liu int i; 11960ce86c7SWei Liu /* 12060ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 12160ce86c7SWei Liu * and P9_DOTL_NOACCESS 12260ce86c7SWei Liu */ 12360ce86c7SWei Liu int oflags = flags & O_ACCMODE; 12460ce86c7SWei Liu 1258e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 12660ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 12760ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 12860ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 12960ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 13060ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 13160ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 13260ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 13360ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 13460ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 13560ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 13660ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 13760ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 13860ce86c7SWei Liu { P9_DOTL_NOATIME, O_NOATIME }, 13960ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 14060ce86c7SWei Liu }; 14160ce86c7SWei Liu 14260ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 14360ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 14460ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 14560ce86c7SWei Liu } 14660ce86c7SWei Liu } 14760ce86c7SWei Liu 14860ce86c7SWei Liu return oflags; 14960ce86c7SWei Liu } 15060ce86c7SWei Liu 15160ce86c7SWei Liu void cred_init(FsCred *credp) 15260ce86c7SWei Liu { 15360ce86c7SWei Liu credp->fc_uid = -1; 15460ce86c7SWei Liu credp->fc_gid = -1; 15560ce86c7SWei Liu credp->fc_mode = -1; 15660ce86c7SWei Liu credp->fc_rdev = -1; 15760ce86c7SWei Liu } 15860ce86c7SWei Liu 15960ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 16060ce86c7SWei Liu { 16160ce86c7SWei Liu int flags; 16260ce86c7SWei Liu /* 16360ce86c7SWei Liu * Filter the client open flags 16460ce86c7SWei Liu */ 16560ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 16660ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 16760ce86c7SWei Liu /* 16860ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 16960ce86c7SWei Liu */ 17060ce86c7SWei Liu flags &= ~O_DIRECT; 17160ce86c7SWei Liu return flags; 17260ce86c7SWei Liu } 17360ce86c7SWei Liu 17460ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 17560ce86c7SWei Liu { 17660ce86c7SWei Liu path->data = NULL; 17760ce86c7SWei Liu path->size = 0; 17860ce86c7SWei Liu } 17960ce86c7SWei Liu 18060ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 18160ce86c7SWei Liu { 18260ce86c7SWei Liu g_free(path->data); 18360ce86c7SWei Liu path->data = NULL; 18460ce86c7SWei Liu path->size = 0; 18560ce86c7SWei Liu } 18660ce86c7SWei Liu 187e3e83f2eSGreg Kurz 188e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 189e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 190e3e83f2eSGreg Kurz { 191e3e83f2eSGreg Kurz va_list ap; 192e3e83f2eSGreg Kurz 193e3e83f2eSGreg Kurz v9fs_path_free(path); 194e3e83f2eSGreg Kurz 195e3e83f2eSGreg Kurz va_start(ap, fmt); 196e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 197e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 198e3e83f2eSGreg Kurz va_end(ap); 199e3e83f2eSGreg Kurz } 200e3e83f2eSGreg Kurz 201e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 20260ce86c7SWei Liu { 203e446a1ebSMarc-André Lureau v9fs_path_free(dst); 204e446a1ebSMarc-André Lureau dst->size = src->size; 205e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 20660ce86c7SWei Liu } 20760ce86c7SWei Liu 20860ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 20960ce86c7SWei Liu const char *name, V9fsPath *path) 21060ce86c7SWei Liu { 21160ce86c7SWei Liu int err; 21260ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 21360ce86c7SWei Liu if (err < 0) { 21460ce86c7SWei Liu err = -errno; 21560ce86c7SWei Liu } 21660ce86c7SWei Liu return err; 21760ce86c7SWei Liu } 21860ce86c7SWei Liu 21960ce86c7SWei Liu /* 22060ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 22160ce86c7SWei Liu * 22260ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 22360ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 22460ce86c7SWei Liu */ 22560ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 22660ce86c7SWei Liu { 22760ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 22860ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 22960ce86c7SWei Liu return 1; 23060ce86c7SWei Liu } 23160ce86c7SWei Liu } 23260ce86c7SWei Liu return 0; 23360ce86c7SWei Liu } 23460ce86c7SWei Liu 23560ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 23660ce86c7SWei Liu { 23760ce86c7SWei Liu return str->size; 23860ce86c7SWei Liu } 23960ce86c7SWei Liu 24060ce86c7SWei Liu /* 24160ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2428440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 24360ce86c7SWei Liu { 24460ce86c7SWei Liu int err = 1; 24560ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 24660ce86c7SWei Liu if (f->fs.fd == -1) { 24760ce86c7SWei Liu do { 24860ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 24960ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25060ce86c7SWei Liu } 25160ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 252f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 25360ce86c7SWei Liu do { 25460ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 25560ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25660ce86c7SWei Liu } 25760ce86c7SWei Liu } 25860ce86c7SWei Liu return err; 25960ce86c7SWei Liu } 26060ce86c7SWei Liu 2618440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 26260ce86c7SWei Liu { 26360ce86c7SWei Liu int err; 26460ce86c7SWei Liu V9fsFidState *f; 26560ce86c7SWei Liu V9fsState *s = pdu->s; 26660ce86c7SWei Liu 267feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 26860ce86c7SWei Liu BUG_ON(f->clunked); 26960ce86c7SWei Liu if (f->fid == fid) { 27060ce86c7SWei Liu /* 27160ce86c7SWei Liu * Update the fid ref upfront so that 27260ce86c7SWei Liu * we don't get reclaimed when we yield 27360ce86c7SWei Liu * in open later. 27460ce86c7SWei Liu */ 27560ce86c7SWei Liu f->ref++; 27660ce86c7SWei Liu /* 27760ce86c7SWei Liu * check whether we need to reopen the 27860ce86c7SWei Liu * file. We might have closed the fd 27960ce86c7SWei Liu * while trying to free up some file 28060ce86c7SWei Liu * descriptors. 28160ce86c7SWei Liu */ 28260ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 28360ce86c7SWei Liu if (err < 0) { 28460ce86c7SWei Liu f->ref--; 28560ce86c7SWei Liu return NULL; 28660ce86c7SWei Liu } 28760ce86c7SWei Liu /* 28860ce86c7SWei Liu * Mark the fid as referenced so that the LRU 28960ce86c7SWei Liu * reclaim won't close the file descriptor 29060ce86c7SWei Liu */ 29160ce86c7SWei Liu f->flags |= FID_REFERENCED; 29260ce86c7SWei Liu return f; 29360ce86c7SWei Liu } 29460ce86c7SWei Liu } 29560ce86c7SWei Liu return NULL; 29660ce86c7SWei Liu } 29760ce86c7SWei Liu 29860ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 29960ce86c7SWei Liu { 30060ce86c7SWei Liu V9fsFidState *f; 30160ce86c7SWei Liu 302feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 30360ce86c7SWei Liu /* If fid is already there return NULL */ 30460ce86c7SWei Liu BUG_ON(f->clunked); 30560ce86c7SWei Liu if (f->fid == fid) { 30660ce86c7SWei Liu return NULL; 30760ce86c7SWei Liu } 30860ce86c7SWei Liu } 30960ce86c7SWei Liu f = g_malloc0(sizeof(V9fsFidState)); 31060ce86c7SWei Liu f->fid = fid; 31160ce86c7SWei Liu f->fid_type = P9_FID_NONE; 31260ce86c7SWei Liu f->ref = 1; 31360ce86c7SWei Liu /* 31460ce86c7SWei Liu * Mark the fid as referenced so that the LRU 31560ce86c7SWei Liu * reclaim won't close the file descriptor 31660ce86c7SWei Liu */ 31760ce86c7SWei Liu f->flags |= FID_REFERENCED; 31820b7f45bSGreg Kurz QSIMPLEQ_INSERT_TAIL(&s->fid_list, f, next); 31960ce86c7SWei Liu 320d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 321d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3227cde47d4SGreg Kurz 32360ce86c7SWei Liu return f; 32460ce86c7SWei Liu } 32560ce86c7SWei Liu 3268440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 32760ce86c7SWei Liu { 32860ce86c7SWei Liu int retval = 0; 32960ce86c7SWei Liu 330dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 33160ce86c7SWei Liu /* getxattr/listxattr fid */ 33260ce86c7SWei Liu goto free_value; 33360ce86c7SWei Liu } 33460ce86c7SWei Liu /* 33560ce86c7SWei Liu * if this is fid for setxattr. clunk should 33660ce86c7SWei Liu * result in setxattr localcall 33760ce86c7SWei Liu */ 33860ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 33960ce86c7SWei Liu /* clunk after partial write */ 34060ce86c7SWei Liu retval = -EINVAL; 34160ce86c7SWei Liu goto free_out; 34260ce86c7SWei Liu } 34360ce86c7SWei Liu if (fidp->fs.xattr.len) { 34460ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 34560ce86c7SWei Liu fidp->fs.xattr.value, 34660ce86c7SWei Liu fidp->fs.xattr.len, 34760ce86c7SWei Liu fidp->fs.xattr.flags); 34860ce86c7SWei Liu } else { 34960ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 35060ce86c7SWei Liu } 35160ce86c7SWei Liu free_out: 35260ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 35360ce86c7SWei Liu free_value: 35460ce86c7SWei Liu g_free(fidp->fs.xattr.value); 35560ce86c7SWei Liu return retval; 35660ce86c7SWei Liu } 35760ce86c7SWei Liu 3588440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 35960ce86c7SWei Liu { 36060ce86c7SWei Liu int retval = 0; 36160ce86c7SWei Liu 36260ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 36360ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 36460ce86c7SWei Liu if (fidp->fs.fd != -1) { 36560ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 36660ce86c7SWei Liu } 36760ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 368f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 36960ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 37060ce86c7SWei Liu } 37160ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 37260ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 37360ce86c7SWei Liu } 37460ce86c7SWei Liu v9fs_path_free(&fidp->path); 37560ce86c7SWei Liu g_free(fidp); 37660ce86c7SWei Liu return retval; 37760ce86c7SWei Liu } 37860ce86c7SWei Liu 3798440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 38060ce86c7SWei Liu { 38160ce86c7SWei Liu BUG_ON(!fidp->ref); 38260ce86c7SWei Liu fidp->ref--; 38360ce86c7SWei Liu /* 38460ce86c7SWei Liu * Don't free the fid if it is in reclaim list 38560ce86c7SWei Liu */ 38660ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 38760ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 38860ce86c7SWei Liu /* 38960ce86c7SWei Liu * if the clunked fid is root fid then we 39060ce86c7SWei Liu * have unmounted the fs on the client side. 39160ce86c7SWei Liu * delete the migration blocker. Ideally, this 39260ce86c7SWei Liu * should be hooked to transport close notification 39360ce86c7SWei Liu */ 39460ce86c7SWei Liu if (pdu->s->migration_blocker) { 39560ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 39660ce86c7SWei Liu error_free(pdu->s->migration_blocker); 39760ce86c7SWei Liu pdu->s->migration_blocker = NULL; 39860ce86c7SWei Liu } 39960ce86c7SWei Liu } 40060ce86c7SWei Liu return free_fid(pdu, fidp); 40160ce86c7SWei Liu } 40260ce86c7SWei Liu return 0; 40360ce86c7SWei Liu } 40460ce86c7SWei Liu 40560ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 40660ce86c7SWei Liu { 407feabd6cfSGreg Kurz V9fsFidState *fidp; 40860ce86c7SWei Liu 409feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 410feabd6cfSGreg Kurz if (fidp->fid == fid) { 411feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 4122e53160fSGreg Kurz fidp->clunked = true; 41360ce86c7SWei Liu return fidp; 41460ce86c7SWei Liu } 415feabd6cfSGreg Kurz } 416feabd6cfSGreg Kurz return NULL; 417feabd6cfSGreg Kurz } 41860ce86c7SWei Liu 4198440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 42060ce86c7SWei Liu { 42160ce86c7SWei Liu int reclaim_count = 0; 42260ce86c7SWei Liu V9fsState *s = pdu->s; 42381f9766bSGreg Kurz V9fsFidState *f; 42481f9766bSGreg Kurz QSLIST_HEAD(, V9fsFidState) reclaim_list = 42581f9766bSGreg Kurz QSLIST_HEAD_INITIALIZER(reclaim_list); 42660ce86c7SWei Liu 427feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 42860ce86c7SWei Liu /* 42960ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 43060ce86c7SWei Liu * for them and skip them. Also skip fids 43160ce86c7SWei Liu * currently being operated on. 43260ce86c7SWei Liu */ 43360ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 43460ce86c7SWei Liu continue; 43560ce86c7SWei Liu } 43660ce86c7SWei Liu /* 43760ce86c7SWei Liu * if it is a recently referenced fid 43860ce86c7SWei Liu * we leave the fid untouched and clear the 43960ce86c7SWei Liu * reference bit. We come back to it later 44060ce86c7SWei Liu * in the next iteration. (a simple LRU without 44160ce86c7SWei Liu * moving list elements around) 44260ce86c7SWei Liu */ 44360ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 44460ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 44560ce86c7SWei Liu continue; 44660ce86c7SWei Liu } 44760ce86c7SWei Liu /* 44860ce86c7SWei Liu * Add fids to reclaim list. 44960ce86c7SWei Liu */ 45060ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 45160ce86c7SWei Liu if (f->fs.fd != -1) { 45260ce86c7SWei Liu /* 45360ce86c7SWei Liu * Up the reference count so that 45460ce86c7SWei Liu * a clunk request won't free this fid 45560ce86c7SWei Liu */ 45660ce86c7SWei Liu f->ref++; 45781f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 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++; 46981f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 470f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 471f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 47260ce86c7SWei Liu reclaim_count++; 47360ce86c7SWei Liu } 47460ce86c7SWei Liu } 47560ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 47660ce86c7SWei Liu break; 47760ce86c7SWei Liu } 47860ce86c7SWei Liu } 47960ce86c7SWei Liu /* 48060ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 48160ce86c7SWei Liu * are already clunked. 48260ce86c7SWei Liu */ 48381f9766bSGreg Kurz while (!QSLIST_EMPTY(&reclaim_list)) { 48481f9766bSGreg Kurz f = QSLIST_FIRST(&reclaim_list); 48581f9766bSGreg Kurz QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); 48660ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 48760ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 48860ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 48960ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 49060ce86c7SWei Liu } 49160ce86c7SWei Liu /* 49260ce86c7SWei Liu * Now drop the fid reference, free it 49360ce86c7SWei Liu * if clunked. 49460ce86c7SWei Liu */ 49560ce86c7SWei Liu put_fid(pdu, f); 49660ce86c7SWei Liu } 49760ce86c7SWei Liu } 49860ce86c7SWei Liu 4998440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 50060ce86c7SWei Liu { 50160ce86c7SWei Liu int err; 50260ce86c7SWei Liu V9fsState *s = pdu->s; 50320b7f45bSGreg Kurz V9fsFidState *fidp, *fidp_next; 50460ce86c7SWei Liu 50520b7f45bSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 50620b7f45bSGreg Kurz if (!fidp) { 50720b7f45bSGreg Kurz return 0; 50860ce86c7SWei Liu } 50920b7f45bSGreg Kurz 51020b7f45bSGreg Kurz /* 51120b7f45bSGreg Kurz * v9fs_reopen_fid() can yield : a reference on the fid must be held 51220b7f45bSGreg Kurz * to ensure its pointer remains valid and we can safely pass it to 51320b7f45bSGreg Kurz * QSIMPLEQ_NEXT(). The corresponding put_fid() can also yield so 51420b7f45bSGreg Kurz * we must keep a reference on the next fid as well. So the logic here 51520b7f45bSGreg Kurz * is to get a reference on a fid and only put it back during the next 51620b7f45bSGreg Kurz * iteration after we could get a reference on the next fid. Start with 51720b7f45bSGreg Kurz * the first one. 51820b7f45bSGreg Kurz */ 51920b7f45bSGreg Kurz for (fidp->ref++; fidp; fidp = fidp_next) { 52020b7f45bSGreg Kurz if (fidp->path.size == path->size && 52120b7f45bSGreg Kurz !memcmp(fidp->path.data, path->data, path->size)) { 52260ce86c7SWei Liu /* Mark the fid non reclaimable. */ 52360ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 52460ce86c7SWei Liu 52560ce86c7SWei Liu /* reopen the file/dir if already closed */ 52660ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 52760ce86c7SWei Liu if (err < 0) { 52820b7f45bSGreg Kurz put_fid(pdu, fidp); 529267fcadfSGreg Kurz return err; 53060ce86c7SWei Liu } 53120b7f45bSGreg Kurz } 53220b7f45bSGreg Kurz 53320b7f45bSGreg Kurz fidp_next = QSIMPLEQ_NEXT(fidp, next); 53420b7f45bSGreg Kurz 53520b7f45bSGreg Kurz if (fidp_next) { 53660ce86c7SWei Liu /* 53720b7f45bSGreg Kurz * Ensure the next fid survives a potential clunk request during 53820b7f45bSGreg Kurz * put_fid() below and v9fs_reopen_fid() in the next iteration. 53960ce86c7SWei Liu */ 54020b7f45bSGreg Kurz fidp_next->ref++; 54160ce86c7SWei Liu } 54220b7f45bSGreg Kurz 54320b7f45bSGreg Kurz /* We're done with this fid */ 54420b7f45bSGreg Kurz put_fid(pdu, fidp); 54560ce86c7SWei Liu } 54620b7f45bSGreg Kurz 54760ce86c7SWei Liu return 0; 54860ce86c7SWei Liu } 54960ce86c7SWei Liu 5508440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 55160ce86c7SWei Liu { 55260ce86c7SWei Liu V9fsState *s = pdu->s; 55379decce3SGreg Kurz V9fsFidState *fidp; 55460ce86c7SWei Liu 55560ce86c7SWei Liu /* Free all fids */ 556feabd6cfSGreg Kurz while (!QSIMPLEQ_EMPTY(&s->fid_list)) { 5576d54af0eSGreg Kurz /* Get fid */ 558feabd6cfSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 5596d54af0eSGreg Kurz fidp->ref++; 56060ce86c7SWei Liu 5616d54af0eSGreg Kurz /* Clunk fid */ 562feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 5632e53160fSGreg Kurz fidp->clunked = true; 5646d54af0eSGreg Kurz 5656d54af0eSGreg Kurz put_fid(pdu, fidp); 56660ce86c7SWei Liu } 56760ce86c7SWei Liu } 56860ce86c7SWei Liu 56960ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 57060ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 57160ce86c7SWei Liu 57260ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 57360ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 57460ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 57560ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 57660ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 57760ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 57860ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 57960ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 58060ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 58160ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 58260ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 58360ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 58460ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 58560ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 58660ce86c7SWei Liu 58760ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 58860ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 58960ce86c7SWei Liu P9_STAT_MODE_LINK | \ 59060ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 59160ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 59260ce86c7SWei Liu P9_STAT_MODE_SOCKET) 59360ce86c7SWei Liu 5946b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 5956b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 5966b6aa828SChristian Schoenebeck { 5976b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 5986b6aa828SChristian Schoenebeck } 5996b6aa828SChristian Schoenebeck 6006b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 6016b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 6026b6aa828SChristian Schoenebeck { 6036b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 6046b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 6056b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 6066b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 6076b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 6086b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 6096b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 6106b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 6116b6aa828SChristian Schoenebeck } 6126b6aa828SChristian Schoenebeck 6136b6aa828SChristian Schoenebeck /** 6146b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 6156b6aa828SChristian Schoenebeck * 6166b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6176b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6186b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6196b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6206b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6216b6aa828SChristian Schoenebeck * 6226b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6236b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6246b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6256b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6266b6aa828SChristian Schoenebeck * 6276b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6286b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6296b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6306b6aa828SChristian Schoenebeck */ 6316b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6326b6aa828SChristian Schoenebeck 6336b6aa828SChristian Schoenebeck /** 6346b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6356b6aa828SChristian Schoenebeck * 6366b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6376b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6386b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6396b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6406b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6416b6aa828SChristian Schoenebeck * 6426b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6436b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6446b6aa828SChristian Schoenebeck * 6456b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6466b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6476b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6486b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6496b6aa828SChristian Schoenebeck */ 6506b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6516b6aa828SChristian Schoenebeck { 6526b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6536b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6546b6aa828SChristian Schoenebeck return (VariLenAffix) { 6556b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6566b6aa828SChristian Schoenebeck .value = value, 6576b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6586b6aa828SChristian Schoenebeck }; 6596b6aa828SChristian Schoenebeck } 6606b6aa828SChristian Schoenebeck 6616b6aa828SChristian Schoenebeck /** 6626b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6636b6aa828SChristian Schoenebeck * 6646b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6656b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6666b6aa828SChristian Schoenebeck * after the conversion. 6676b6aa828SChristian Schoenebeck * 6686b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6696b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6706b6aa828SChristian Schoenebeck * versa). 6716b6aa828SChristian Schoenebeck */ 6726b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6736b6aa828SChristian Schoenebeck { 6746b6aa828SChristian Schoenebeck return (VariLenAffix) { 6756b6aa828SChristian Schoenebeck .type = 6766b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6776b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6786b6aa828SChristian Schoenebeck .value = 6796b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6806b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6816b6aa828SChristian Schoenebeck .bits = affix->bits 6826b6aa828SChristian Schoenebeck }; 6836b6aa828SChristian Schoenebeck } 6846b6aa828SChristian Schoenebeck 6856b6aa828SChristian Schoenebeck /** 6866b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6876b6aa828SChristian Schoenebeck * 6886b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6896b6aa828SChristian Schoenebeck * 6906b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6916b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6926b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 6936b6aa828SChristian Schoenebeck * 6946b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 6956b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6966b6aa828SChristian Schoenebeck */ 6976b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 6986b6aa828SChristian Schoenebeck { 6996b6aa828SChristian Schoenebeck VariLenAffix prefix; 7006b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 7016b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 7026b6aa828SChristian Schoenebeck } 7036b6aa828SChristian Schoenebeck 7041a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 7051a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 7061a6ed33cSAntonios Motakis { 7071a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 7081a6ed33cSAntonios Motakis } 7091a6ed33cSAntonios Motakis 710f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 711f3fe4a2dSAntonios Motakis { 712f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 713f3fe4a2dSAntonios Motakis } 714f3fe4a2dSAntonios Motakis 7156b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7166b6aa828SChristian Schoenebeck { 7176b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7186b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7196b6aa828SChristian Schoenebeck } 7206b6aa828SChristian Schoenebeck 7216b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7221a6ed33cSAntonios Motakis { 7231a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7241a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7251a6ed33cSAntonios Motakis } 7261a6ed33cSAntonios Motakis 7276b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 728f3fe4a2dSAntonios Motakis { 729f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 730f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 731f3fe4a2dSAntonios Motakis } 732f3fe4a2dSAntonios Motakis 733f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7341a6ed33cSAntonios Motakis { 7351a6ed33cSAntonios Motakis g_free(p); 7361a6ed33cSAntonios Motakis } 7371a6ed33cSAntonios Motakis 738f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7391a6ed33cSAntonios Motakis { 7401a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7411a6ed33cSAntonios Motakis return; 7421a6ed33cSAntonios Motakis } 743f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7441a6ed33cSAntonios Motakis qht_destroy(ht); 7451a6ed33cSAntonios Motakis } 7461a6ed33cSAntonios Motakis 7476b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7486b6aa828SChristian Schoenebeck { 7496b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7506b6aa828SChristian Schoenebeck } 7516b6aa828SChristian Schoenebeck 7521a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7531a6ed33cSAntonios Motakis { 7546b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7551a6ed33cSAntonios Motakis } 7561a6ed33cSAntonios Motakis 757f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 758f3fe4a2dSAntonios Motakis { 7596b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 760f3fe4a2dSAntonios Motakis } 761f3fe4a2dSAntonios Motakis 7626b6aa828SChristian Schoenebeck /* 7636b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7646b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7656b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7666b6aa828SChristian Schoenebeck * 7676b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7686b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7696b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7706b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7716b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7726b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7736b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7746b6aa828SChristian Schoenebeck */ 7756b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7766b6aa828SChristian Schoenebeck { 7776b6aa828SChristian Schoenebeck QpdEntry lookup = { 7786b6aa828SChristian Schoenebeck .dev = dev 7796b6aa828SChristian Schoenebeck }, *val; 7806b6aa828SChristian Schoenebeck uint32_t hash = dev; 7816b6aa828SChristian Schoenebeck VariLenAffix affix; 7826b6aa828SChristian Schoenebeck 7836b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7846b6aa828SChristian Schoenebeck if (!val) { 7856b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7866b6aa828SChristian Schoenebeck *val = lookup; 7876b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7886b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7896b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7906b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7916b6aa828SChristian Schoenebeck } 7926b6aa828SChristian Schoenebeck return val->prefix_bits; 7936b6aa828SChristian Schoenebeck } 7946b6aa828SChristian Schoenebeck 7956b6aa828SChristian Schoenebeck /** 7966b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 7976b6aa828SChristian Schoenebeck * 7986b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 7996b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 8006b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 8016b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 8026b6aa828SChristian Schoenebeck * guest. 8036b6aa828SChristian Schoenebeck * 8046b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 8056b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 8066b6aa828SChristian Schoenebeck * expected ever to be used at all though. 8076b6aa828SChristian Schoenebeck * 8086b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 8096b6aa828SChristian Schoenebeck * 8106b6aa828SChristian Schoenebeck */ 811f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 812f3fe4a2dSAntonios Motakis uint64_t *path) 813f3fe4a2dSAntonios Motakis { 814f3fe4a2dSAntonios Motakis QpfEntry lookup = { 815f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 816f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 817f3fe4a2dSAntonios Motakis }, *val; 818f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8196b6aa828SChristian Schoenebeck VariLenAffix affix; 820f3fe4a2dSAntonios Motakis 821f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 822f3fe4a2dSAntonios Motakis 823f3fe4a2dSAntonios Motakis if (!val) { 824f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 825f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 826f3fe4a2dSAntonios Motakis error_report_once( 827f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 828f3fe4a2dSAntonios Motakis "host to guest." 829f3fe4a2dSAntonios Motakis ); 830f3fe4a2dSAntonios Motakis return -ENFILE; 831f3fe4a2dSAntonios Motakis } 832f3fe4a2dSAntonios Motakis 833f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 834f3fe4a2dSAntonios Motakis *val = lookup; 835f3fe4a2dSAntonios Motakis 836f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8376b6aa828SChristian Schoenebeck affix = affixForIndex( 8386b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8396b6aa828SChristian Schoenebeck ); 8406b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8416b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 842f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 843f3fe4a2dSAntonios Motakis } 844f3fe4a2dSAntonios Motakis 845f3fe4a2dSAntonios Motakis *path = val->path; 846f3fe4a2dSAntonios Motakis return 0; 847f3fe4a2dSAntonios Motakis } 848f3fe4a2dSAntonios Motakis 8496b6aa828SChristian Schoenebeck /** 8506b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8511a6ed33cSAntonios Motakis * 8526b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8536b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8546b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8556b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8566b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8576b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8586b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8596b6aa828SChristian Schoenebeck * that is). 8606b6aa828SChristian Schoenebeck * 8616b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8626b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8636b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8646b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8656b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8666b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8676b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8686b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8696b6aa828SChristian Schoenebeck * 8706b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8716b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8726b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8736b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8746b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8756b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8766b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8776b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8786b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8796b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8806b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8816b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8826b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8836b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8846b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8856b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8866b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8871a6ed33cSAntonios Motakis */ 8886b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8891a6ed33cSAntonios Motakis uint64_t *path) 8901a6ed33cSAntonios Motakis { 8916b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8921a6ed33cSAntonios Motakis QppEntry lookup = { 8931a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 8946b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 8951a6ed33cSAntonios Motakis }, *val; 8961a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 8971a6ed33cSAntonios Motakis 8981a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 8991a6ed33cSAntonios Motakis 9001a6ed33cSAntonios Motakis if (!val) { 9016b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 9026b6aa828SChristian Schoenebeck /* we ran out of affixes */ 903f3fe4a2dSAntonios Motakis warn_report_once( 904f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 9051a6ed33cSAntonios Motakis ); 9061a6ed33cSAntonios Motakis return -ENFILE; 9071a6ed33cSAntonios Motakis } 9081a6ed33cSAntonios Motakis 9091a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 9101a6ed33cSAntonios Motakis *val = lookup; 9111a6ed33cSAntonios Motakis 9126b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 9136b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 9146b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 9151a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9161a6ed33cSAntonios Motakis } 9176b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9186b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9191a6ed33cSAntonios Motakis return 0; 9201a6ed33cSAntonios Motakis } 9211a6ed33cSAntonios Motakis 9223b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 92360ce86c7SWei Liu { 9241a6ed33cSAntonios Motakis int err; 92560ce86c7SWei Liu size_t size; 92660ce86c7SWei Liu 9271a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9281a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9296b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 930f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 931f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 932f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 933f3fe4a2dSAntonios Motakis } 9341a6ed33cSAntonios Motakis if (err) { 9351a6ed33cSAntonios Motakis return err; 9361a6ed33cSAntonios Motakis } 9371a6ed33cSAntonios Motakis } else { 9383b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9391a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9401a6ed33cSAntonios Motakis error_report_once( 9411a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9421a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9431a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9441a6ed33cSAntonios Motakis "effective." 9451a6ed33cSAntonios Motakis ); 9461a6ed33cSAntonios Motakis return -ENODEV; 9471a6ed33cSAntonios Motakis } else { 9483b5ee9e8SAntonios Motakis warn_report_once( 9493b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9503b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9511a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9521a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9531a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9543b5ee9e8SAntonios Motakis ); 9553b5ee9e8SAntonios Motakis } 9561a6ed33cSAntonios Motakis } 95760ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 95860ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 95960ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9601a6ed33cSAntonios Motakis } 9611a6ed33cSAntonios Motakis 96260ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 96360ce86c7SWei Liu qidp->type = 0; 96460ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 96560ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 96660ce86c7SWei Liu } 96760ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 96860ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 96960ce86c7SWei Liu } 9703b5ee9e8SAntonios Motakis 9713b5ee9e8SAntonios Motakis return 0; 97260ce86c7SWei Liu } 97360ce86c7SWei Liu 9748440e22eSGreg Kurz static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, 9758440e22eSGreg Kurz V9fsQID *qidp) 97660ce86c7SWei Liu { 97760ce86c7SWei Liu struct stat stbuf; 97860ce86c7SWei Liu int err; 97960ce86c7SWei Liu 98060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 98160ce86c7SWei Liu if (err < 0) { 98260ce86c7SWei Liu return err; 98360ce86c7SWei Liu } 9843b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, qidp); 9853b5ee9e8SAntonios Motakis if (err < 0) { 9863b5ee9e8SAntonios Motakis return err; 9873b5ee9e8SAntonios Motakis } 98860ce86c7SWei Liu return 0; 98960ce86c7SWei Liu } 99060ce86c7SWei Liu 99160ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 99260ce86c7SWei Liu { 99360ce86c7SWei Liu V9fsPDU *pdu = NULL; 99460ce86c7SWei Liu 99560ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 99660ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 99760ce86c7SWei Liu QLIST_REMOVE(pdu, next); 99860ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 99960ce86c7SWei Liu } 100060ce86c7SWei Liu return pdu; 100160ce86c7SWei Liu } 100260ce86c7SWei Liu 100360ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 100460ce86c7SWei Liu { 100560ce86c7SWei Liu V9fsState *s = pdu->s; 1006f74e27bfSGreg Kurz 1007f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 100860ce86c7SWei Liu QLIST_REMOVE(pdu, next); 100960ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 101060ce86c7SWei Liu } 101160ce86c7SWei Liu 10128440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 101360ce86c7SWei Liu { 101460ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 101560ce86c7SWei Liu V9fsState *s = pdu->s; 101606a37db7SGreg Kurz int ret; 101760ce86c7SWei Liu 1018fc78d5eeSKeno Fischer /* 1019fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1020fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1021fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1022fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1023fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1024fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1025fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1026fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1027fc78d5eeSKeno Fischer * transmission of the reply. 1028fc78d5eeSKeno Fischer */ 1029fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1030fc78d5eeSKeno Fischer if (discard) { 1031fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1032fc78d5eeSKeno Fischer pdu->size = 0; 1033fc78d5eeSKeno Fischer goto out_notify; 1034fc78d5eeSKeno Fischer } 1035fc78d5eeSKeno Fischer 103660ce86c7SWei Liu if (len < 0) { 103760ce86c7SWei Liu int err = -len; 103860ce86c7SWei Liu len = 7; 103960ce86c7SWei Liu 104060ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 104160ce86c7SWei Liu V9fsString str; 104260ce86c7SWei Liu 104360ce86c7SWei Liu str.data = strerror(err); 104460ce86c7SWei Liu str.size = strlen(str.data); 104560ce86c7SWei Liu 104606a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 104706a37db7SGreg Kurz if (ret < 0) { 104806a37db7SGreg Kurz goto out_notify; 104906a37db7SGreg Kurz } 105006a37db7SGreg Kurz len += ret; 105160ce86c7SWei Liu id = P9_RERROR; 105260ce86c7SWei Liu } 105360ce86c7SWei Liu 105406a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 105506a37db7SGreg Kurz if (ret < 0) { 105606a37db7SGreg Kurz goto out_notify; 105706a37db7SGreg Kurz } 105806a37db7SGreg Kurz len += ret; 105960ce86c7SWei Liu 106060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 106160ce86c7SWei Liu id = P9_RLERROR; 106260ce86c7SWei Liu } 106360ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 106460ce86c7SWei Liu } 106560ce86c7SWei Liu 106660ce86c7SWei Liu /* fill out the header */ 106706a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 106806a37db7SGreg Kurz goto out_notify; 106906a37db7SGreg Kurz } 107060ce86c7SWei Liu 107160ce86c7SWei Liu /* keep these in sync */ 107260ce86c7SWei Liu pdu->size = len; 107360ce86c7SWei Liu pdu->id = id; 107460ce86c7SWei Liu 107506a37db7SGreg Kurz out_notify: 1076a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 107760ce86c7SWei Liu 107860ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1079f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 108060ce86c7SWei Liu pdu_free(pdu); 108160ce86c7SWei Liu } 1082f74e27bfSGreg Kurz } 108360ce86c7SWei Liu 108460ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 108560ce86c7SWei Liu { 108660ce86c7SWei Liu mode_t ret; 108760ce86c7SWei Liu 108860ce86c7SWei Liu ret = mode & 0777; 108960ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 109060ce86c7SWei Liu ret |= S_IFDIR; 109160ce86c7SWei Liu } 109260ce86c7SWei Liu 109360ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 109460ce86c7SWei Liu ret |= S_IFLNK; 109560ce86c7SWei Liu } 109660ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 109760ce86c7SWei Liu ret |= S_IFSOCK; 109860ce86c7SWei Liu } 109960ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 110060ce86c7SWei Liu ret |= S_IFIFO; 110160ce86c7SWei Liu } 110260ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 110360ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 110460ce86c7SWei Liu ret |= S_IFCHR; 110560ce86c7SWei Liu } else { 110660ce86c7SWei Liu ret |= S_IFBLK; 110760ce86c7SWei Liu } 110860ce86c7SWei Liu } 110960ce86c7SWei Liu 111060ce86c7SWei Liu if (!(ret & ~0777)) { 111160ce86c7SWei Liu ret |= S_IFREG; 111260ce86c7SWei Liu } 111360ce86c7SWei Liu 111460ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 111560ce86c7SWei Liu ret |= S_ISUID; 111660ce86c7SWei Liu } 111760ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 111860ce86c7SWei Liu ret |= S_ISGID; 111960ce86c7SWei Liu } 112060ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 112160ce86c7SWei Liu ret |= S_ISVTX; 112260ce86c7SWei Liu } 112360ce86c7SWei Liu 112460ce86c7SWei Liu return ret; 112560ce86c7SWei Liu } 112660ce86c7SWei Liu 112760ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 112860ce86c7SWei Liu { 112960ce86c7SWei Liu if (stat->type == -1 && 113060ce86c7SWei Liu stat->dev == -1 && 113187032833SAntonios Motakis stat->qid.type == 0xff && 113287032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 113387032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 113460ce86c7SWei Liu stat->mode == -1 && 113560ce86c7SWei Liu stat->atime == -1 && 113660ce86c7SWei Liu stat->mtime == -1 && 113760ce86c7SWei Liu stat->length == -1 && 113860ce86c7SWei Liu !stat->name.size && 113960ce86c7SWei Liu !stat->uid.size && 114060ce86c7SWei Liu !stat->gid.size && 114160ce86c7SWei Liu !stat->muid.size && 114260ce86c7SWei Liu stat->n_uid == -1 && 114360ce86c7SWei Liu stat->n_gid == -1 && 114460ce86c7SWei Liu stat->n_muid == -1) { 114560ce86c7SWei Liu return 1; 114660ce86c7SWei Liu } 114760ce86c7SWei Liu 114860ce86c7SWei Liu return 0; 114960ce86c7SWei Liu } 115060ce86c7SWei Liu 115160ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 115260ce86c7SWei Liu { 115360ce86c7SWei Liu v9fs_string_init(&stat->name); 115460ce86c7SWei Liu v9fs_string_init(&stat->uid); 115560ce86c7SWei Liu v9fs_string_init(&stat->gid); 115660ce86c7SWei Liu v9fs_string_init(&stat->muid); 115760ce86c7SWei Liu v9fs_string_init(&stat->extension); 115860ce86c7SWei Liu } 115960ce86c7SWei Liu 116060ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 116160ce86c7SWei Liu { 116260ce86c7SWei Liu v9fs_string_free(&stat->name); 116360ce86c7SWei Liu v9fs_string_free(&stat->uid); 116460ce86c7SWei Liu v9fs_string_free(&stat->gid); 116560ce86c7SWei Liu v9fs_string_free(&stat->muid); 116660ce86c7SWei Liu v9fs_string_free(&stat->extension); 116760ce86c7SWei Liu } 116860ce86c7SWei Liu 116960ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 117060ce86c7SWei Liu { 117160ce86c7SWei Liu uint32_t mode; 117260ce86c7SWei Liu 117360ce86c7SWei Liu mode = stbuf->st_mode & 0777; 117460ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 117560ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 117660ce86c7SWei Liu } 117760ce86c7SWei Liu 117860ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 117960ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 118060ce86c7SWei Liu } 118160ce86c7SWei Liu 118260ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 118360ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 118460ce86c7SWei Liu } 118560ce86c7SWei Liu 118660ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 118760ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 118860ce86c7SWei Liu } 118960ce86c7SWei Liu 119060ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 119160ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 119260ce86c7SWei Liu } 119360ce86c7SWei Liu 119460ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 119560ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 119660ce86c7SWei Liu } 119760ce86c7SWei Liu 119860ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 119960ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 120060ce86c7SWei Liu } 120160ce86c7SWei Liu 120260ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 120360ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 120460ce86c7SWei Liu } 120560ce86c7SWei Liu 120660ce86c7SWei Liu return mode; 120760ce86c7SWei Liu } 120860ce86c7SWei Liu 12096069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 12106069537fSJan Dakinevich const char *basename, 121160ce86c7SWei Liu const struct stat *stbuf, 121260ce86c7SWei Liu V9fsStat *v9stat) 121360ce86c7SWei Liu { 121460ce86c7SWei Liu int err; 121560ce86c7SWei Liu 121660ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 121760ce86c7SWei Liu 12183b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12193b5ee9e8SAntonios Motakis if (err < 0) { 12203b5ee9e8SAntonios Motakis return err; 12213b5ee9e8SAntonios Motakis } 122260ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 122360ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 122460ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 122560ce86c7SWei Liu v9stat->length = stbuf->st_size; 122660ce86c7SWei Liu 1227abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1228abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1229abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 123060ce86c7SWei Liu 123160ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 123260ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 123360ce86c7SWei Liu v9stat->n_muid = 0; 123460ce86c7SWei Liu 1235abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 123660ce86c7SWei Liu 123760ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12386069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 123960ce86c7SWei Liu if (err < 0) { 124060ce86c7SWei Liu return err; 124160ce86c7SWei Liu } 124260ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 124360ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 124460ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 124560ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 124660ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 124760ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 124860ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 124960ce86c7SWei Liu } 125060ce86c7SWei Liu 12516069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 125260ce86c7SWei Liu 125360ce86c7SWei Liu v9stat->size = 61 + 125460ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 125560ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 125660ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 125760ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 125860ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 125960ce86c7SWei Liu return 0; 126060ce86c7SWei Liu } 126160ce86c7SWei Liu 126260ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 126360ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 126460ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 126560ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 126660ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 126760ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 126860ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 126960ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 127060ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 127160ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 127260ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 127360ce86c7SWei Liu 127460ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 127560ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 127660ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 127760ce86c7SWei Liu 127860ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 127960ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 128060ce86c7SWei Liu 128160ce86c7SWei Liu 12823b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 128360ce86c7SWei Liu V9fsStatDotl *v9lstat) 128460ce86c7SWei Liu { 128560ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 128660ce86c7SWei Liu 128760ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 128860ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 128960ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 129060ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 129160ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 129260ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 129360ce86c7SWei Liu v9lstat->st_blksize = stbuf->st_blksize; 129460ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 129560ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 129660ce86c7SWei Liu v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 129760ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 129860ce86c7SWei Liu v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 129960ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 130060ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 130160ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 130260ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 130360ce86c7SWei Liu 13043b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 130560ce86c7SWei Liu } 130660ce86c7SWei Liu 130760ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 130860ce86c7SWei Liu { 130960ce86c7SWei Liu int i; 131060ce86c7SWei Liu 131160ce86c7SWei Liu printf("sg[%d]: {", cnt); 131260ce86c7SWei Liu for (i = 0; i < cnt; i++) { 131360ce86c7SWei Liu if (i) { 131460ce86c7SWei Liu printf(", "); 131560ce86c7SWei Liu } 131660ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 131760ce86c7SWei Liu } 131860ce86c7SWei Liu printf("}\n"); 131960ce86c7SWei Liu } 132060ce86c7SWei Liu 132160ce86c7SWei Liu /* Will call this only for path name based fid */ 132260ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 132360ce86c7SWei Liu { 132460ce86c7SWei Liu V9fsPath str; 132560ce86c7SWei Liu v9fs_path_init(&str); 132660ce86c7SWei Liu v9fs_path_copy(&str, dst); 1327e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 132860ce86c7SWei Liu v9fs_path_free(&str); 132960ce86c7SWei Liu } 133060ce86c7SWei Liu 133160ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 133260ce86c7SWei Liu { 133360ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 133460ce86c7SWei Liu } 133560ce86c7SWei Liu 13368440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 133760ce86c7SWei Liu { 133860ce86c7SWei Liu ssize_t err; 133960ce86c7SWei Liu V9fsPDU *pdu = opaque; 134060ce86c7SWei Liu V9fsState *s = pdu->s; 134160ce86c7SWei Liu V9fsString version; 134260ce86c7SWei Liu size_t offset = 7; 134360ce86c7SWei Liu 134460ce86c7SWei Liu v9fs_string_init(&version); 134560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 134660ce86c7SWei Liu if (err < 0) { 134760ce86c7SWei Liu goto out; 134860ce86c7SWei Liu } 134960ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 135060ce86c7SWei Liu 135160ce86c7SWei Liu virtfs_reset(pdu); 135260ce86c7SWei Liu 135360ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 135460ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 135560ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 135660ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 135760ce86c7SWei Liu } else { 135860ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1359e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1360e16453a3SChristian Schoenebeck goto marshal; 136160ce86c7SWei Liu } 136260ce86c7SWei Liu 1363e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1364e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1365e16453a3SChristian Schoenebeck error_report( 1366e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1367e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1368e16453a3SChristian Schoenebeck ); 1369e16453a3SChristian Schoenebeck goto out; 1370e16453a3SChristian Schoenebeck } 1371e16453a3SChristian Schoenebeck 137262777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1373c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 137462777d82SChristian Schoenebeck warn_report_once( 137562777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 137662777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 137762777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 137862777d82SChristian Schoenebeck ); 137962777d82SChristian Schoenebeck } 138062777d82SChristian Schoenebeck 1381e16453a3SChristian Schoenebeck marshal: 138260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 138360ce86c7SWei Liu if (err < 0) { 138460ce86c7SWei Liu goto out; 138560ce86c7SWei Liu } 1386403a905bSPhilippe Mathieu-Daudé err += offset; 138760ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 138860ce86c7SWei Liu out: 1389403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 139060ce86c7SWei Liu v9fs_string_free(&version); 139160ce86c7SWei Liu } 139260ce86c7SWei Liu 13938440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 139460ce86c7SWei Liu { 139560ce86c7SWei Liu V9fsPDU *pdu = opaque; 139660ce86c7SWei Liu V9fsState *s = pdu->s; 139760ce86c7SWei Liu int32_t fid, afid, n_uname; 139860ce86c7SWei Liu V9fsString uname, aname; 139960ce86c7SWei Liu V9fsFidState *fidp; 140060ce86c7SWei Liu size_t offset = 7; 140160ce86c7SWei Liu V9fsQID qid; 140260ce86c7SWei Liu ssize_t err; 1403*11024375SChristian Schoenebeck struct stat stbuf; 140460ce86c7SWei Liu 140560ce86c7SWei Liu v9fs_string_init(&uname); 140660ce86c7SWei Liu v9fs_string_init(&aname); 140760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 140860ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 140960ce86c7SWei Liu if (err < 0) { 141060ce86c7SWei Liu goto out_nofid; 141160ce86c7SWei Liu } 141260ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 141360ce86c7SWei Liu 141460ce86c7SWei Liu fidp = alloc_fid(s, fid); 141560ce86c7SWei Liu if (fidp == NULL) { 141660ce86c7SWei Liu err = -EINVAL; 141760ce86c7SWei Liu goto out_nofid; 141860ce86c7SWei Liu } 141960ce86c7SWei Liu fidp->uid = n_uname; 142060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 142160ce86c7SWei Liu if (err < 0) { 142260ce86c7SWei Liu err = -EINVAL; 142360ce86c7SWei Liu clunk_fid(s, fid); 142460ce86c7SWei Liu goto out; 142560ce86c7SWei Liu } 1426*11024375SChristian Schoenebeck err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 1427*11024375SChristian Schoenebeck if (err < 0) { 1428*11024375SChristian Schoenebeck err = -EINVAL; 1429*11024375SChristian Schoenebeck clunk_fid(s, fid); 1430*11024375SChristian Schoenebeck goto out; 1431*11024375SChristian Schoenebeck } 1432*11024375SChristian Schoenebeck err = stat_to_qid(pdu, &stbuf, &qid); 143360ce86c7SWei Liu if (err < 0) { 143460ce86c7SWei Liu err = -EINVAL; 143560ce86c7SWei Liu clunk_fid(s, fid); 143660ce86c7SWei Liu goto out; 143760ce86c7SWei Liu } 1438fe44dc91SAshijeet Acharya 1439fe44dc91SAshijeet Acharya /* 1440fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1441fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1442fe44dc91SAshijeet Acharya */ 1443fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1444fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1445fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1446fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14479261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14489261ef5eSMarkus Armbruster if (err < 0) { 1449fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1450fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1451fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1452fe44dc91SAshijeet Acharya goto out; 1453fe44dc91SAshijeet Acharya } 1454fe44dc91SAshijeet Acharya s->root_fid = fid; 1455fe44dc91SAshijeet Acharya } 1456fe44dc91SAshijeet Acharya 145760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 145860ce86c7SWei Liu if (err < 0) { 145960ce86c7SWei Liu clunk_fid(s, fid); 146060ce86c7SWei Liu goto out; 146160ce86c7SWei Liu } 146260ce86c7SWei Liu err += offset; 1463fe44dc91SAshijeet Acharya 146456f101ecSGreg Kurz memcpy(&s->root_qid, &qid, sizeof(qid)); 1465*11024375SChristian Schoenebeck memcpy(&s->root_st, &stbuf, sizeof(stbuf)); 146660ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 146760ce86c7SWei Liu qid.type, qid.version, qid.path); 146860ce86c7SWei Liu out: 146960ce86c7SWei Liu put_fid(pdu, fidp); 147060ce86c7SWei Liu out_nofid: 147160ce86c7SWei Liu pdu_complete(pdu, err); 147260ce86c7SWei Liu v9fs_string_free(&uname); 147360ce86c7SWei Liu v9fs_string_free(&aname); 147460ce86c7SWei Liu } 147560ce86c7SWei Liu 14768440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 147760ce86c7SWei Liu { 147860ce86c7SWei Liu int32_t fid; 147960ce86c7SWei Liu V9fsStat v9stat; 148060ce86c7SWei Liu ssize_t err = 0; 148160ce86c7SWei Liu size_t offset = 7; 148260ce86c7SWei Liu struct stat stbuf; 148360ce86c7SWei Liu V9fsFidState *fidp; 148460ce86c7SWei Liu V9fsPDU *pdu = opaque; 14856069537fSJan Dakinevich char *basename; 148660ce86c7SWei Liu 148760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 148860ce86c7SWei Liu if (err < 0) { 148960ce86c7SWei Liu goto out_nofid; 149060ce86c7SWei Liu } 149160ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 149260ce86c7SWei Liu 149360ce86c7SWei Liu fidp = get_fid(pdu, fid); 149460ce86c7SWei Liu if (fidp == NULL) { 149560ce86c7SWei Liu err = -ENOENT; 149660ce86c7SWei Liu goto out_nofid; 149760ce86c7SWei Liu } 149860ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 149960ce86c7SWei Liu if (err < 0) { 150060ce86c7SWei Liu goto out; 150160ce86c7SWei Liu } 15026069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 15036069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 15046069537fSJan Dakinevich g_free(basename); 150560ce86c7SWei Liu if (err < 0) { 150660ce86c7SWei Liu goto out; 150760ce86c7SWei Liu } 150860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 150960ce86c7SWei Liu if (err < 0) { 151060ce86c7SWei Liu v9fs_stat_free(&v9stat); 151160ce86c7SWei Liu goto out; 151260ce86c7SWei Liu } 151360ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 151460ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 151560ce86c7SWei Liu err += offset; 151660ce86c7SWei Liu v9fs_stat_free(&v9stat); 151760ce86c7SWei Liu out: 151860ce86c7SWei Liu put_fid(pdu, fidp); 151960ce86c7SWei Liu out_nofid: 152060ce86c7SWei Liu pdu_complete(pdu, err); 152160ce86c7SWei Liu } 152260ce86c7SWei Liu 15238440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 152460ce86c7SWei Liu { 152560ce86c7SWei Liu int32_t fid; 152660ce86c7SWei Liu size_t offset = 7; 152760ce86c7SWei Liu ssize_t retval = 0; 152860ce86c7SWei Liu struct stat stbuf; 152960ce86c7SWei Liu V9fsFidState *fidp; 153060ce86c7SWei Liu uint64_t request_mask; 153160ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 153260ce86c7SWei Liu V9fsPDU *pdu = opaque; 153360ce86c7SWei Liu 153460ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 153560ce86c7SWei Liu if (retval < 0) { 153660ce86c7SWei Liu goto out_nofid; 153760ce86c7SWei Liu } 153860ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 153960ce86c7SWei Liu 154060ce86c7SWei Liu fidp = get_fid(pdu, fid); 154160ce86c7SWei Liu if (fidp == NULL) { 154260ce86c7SWei Liu retval = -ENOENT; 154360ce86c7SWei Liu goto out_nofid; 154460ce86c7SWei Liu } 154560ce86c7SWei Liu /* 154660ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 154760ce86c7SWei Liu * need to look at request_mask. 154860ce86c7SWei Liu */ 154960ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 155060ce86c7SWei Liu if (retval < 0) { 155160ce86c7SWei Liu goto out; 155260ce86c7SWei Liu } 15533b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15543b5ee9e8SAntonios Motakis if (retval < 0) { 15553b5ee9e8SAntonios Motakis goto out; 15563b5ee9e8SAntonios Motakis } 155760ce86c7SWei Liu 155860ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 155960ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 156060ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 156160ce86c7SWei Liu switch (retval) { 156260ce86c7SWei Liu case 0: 156360ce86c7SWei Liu /* we have valid st_gen: update result mask */ 156460ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 156560ce86c7SWei Liu break; 156660ce86c7SWei Liu case -EINTR: 156760ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 156860ce86c7SWei Liu goto out; 156960ce86c7SWei Liu default: 157060ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 157160ce86c7SWei Liu break; 157260ce86c7SWei Liu } 157360ce86c7SWei Liu } 157460ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 157560ce86c7SWei Liu if (retval < 0) { 157660ce86c7SWei Liu goto out; 157760ce86c7SWei Liu } 157860ce86c7SWei Liu retval += offset; 157960ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 158060ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 158160ce86c7SWei Liu v9stat_dotl.st_gid); 158260ce86c7SWei Liu out: 158360ce86c7SWei Liu put_fid(pdu, fidp); 158460ce86c7SWei Liu out_nofid: 158560ce86c7SWei Liu pdu_complete(pdu, retval); 158660ce86c7SWei Liu } 158760ce86c7SWei Liu 158860ce86c7SWei Liu /* Attribute flags */ 158960ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 159060ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 159160ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 159260ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 159360ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 159460ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 159560ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 159660ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 159760ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 159860ce86c7SWei Liu 159960ce86c7SWei Liu #define P9_ATTR_MASK 127 160060ce86c7SWei Liu 16018440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 160260ce86c7SWei Liu { 160360ce86c7SWei Liu int err = 0; 160460ce86c7SWei Liu int32_t fid; 160560ce86c7SWei Liu V9fsFidState *fidp; 160660ce86c7SWei Liu size_t offset = 7; 160760ce86c7SWei Liu V9fsIattr v9iattr; 160860ce86c7SWei Liu V9fsPDU *pdu = opaque; 160960ce86c7SWei Liu 161060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 161160ce86c7SWei Liu if (err < 0) { 161260ce86c7SWei Liu goto out_nofid; 161360ce86c7SWei Liu } 161460ce86c7SWei Liu 16158f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16168f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16178f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16188f9c64bfSGreg Kurz 161960ce86c7SWei Liu fidp = get_fid(pdu, fid); 162060ce86c7SWei Liu if (fidp == NULL) { 162160ce86c7SWei Liu err = -EINVAL; 162260ce86c7SWei Liu goto out_nofid; 162360ce86c7SWei Liu } 162460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 162560ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 162660ce86c7SWei Liu if (err < 0) { 162760ce86c7SWei Liu goto out; 162860ce86c7SWei Liu } 162960ce86c7SWei Liu } 163060ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 163160ce86c7SWei Liu struct timespec times[2]; 163260ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 163360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 163460ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 163560ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 163660ce86c7SWei Liu } else { 163760ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 163860ce86c7SWei Liu } 163960ce86c7SWei Liu } else { 164060ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 164160ce86c7SWei Liu } 164260ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 164360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 164460ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 164560ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 164660ce86c7SWei Liu } else { 164760ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 164860ce86c7SWei Liu } 164960ce86c7SWei Liu } else { 165060ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 165160ce86c7SWei Liu } 165260ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 165360ce86c7SWei Liu if (err < 0) { 165460ce86c7SWei Liu goto out; 165560ce86c7SWei Liu } 165660ce86c7SWei Liu } 165760ce86c7SWei Liu /* 165860ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 165960ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 166060ce86c7SWei Liu */ 166160ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 166260ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 166360ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 166460ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 166560ce86c7SWei Liu v9iattr.uid = -1; 166660ce86c7SWei Liu } 166760ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 166860ce86c7SWei Liu v9iattr.gid = -1; 166960ce86c7SWei Liu } 167060ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 167160ce86c7SWei Liu v9iattr.gid); 167260ce86c7SWei Liu if (err < 0) { 167360ce86c7SWei Liu goto out; 167460ce86c7SWei Liu } 167560ce86c7SWei Liu } 167660ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 167760ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 167860ce86c7SWei Liu if (err < 0) { 167960ce86c7SWei Liu goto out; 168060ce86c7SWei Liu } 168160ce86c7SWei Liu } 168260ce86c7SWei Liu err = offset; 16838f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 168460ce86c7SWei Liu out: 168560ce86c7SWei Liu put_fid(pdu, fidp); 168660ce86c7SWei Liu out_nofid: 168760ce86c7SWei Liu pdu_complete(pdu, err); 168860ce86c7SWei Liu } 168960ce86c7SWei Liu 169060ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 169160ce86c7SWei Liu { 169260ce86c7SWei Liu int i; 169360ce86c7SWei Liu ssize_t err; 169460ce86c7SWei Liu size_t offset = 7; 169560ce86c7SWei Liu 169660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 169760ce86c7SWei Liu if (err < 0) { 169860ce86c7SWei Liu return err; 169960ce86c7SWei Liu } 170060ce86c7SWei Liu offset += err; 170160ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 170260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 170360ce86c7SWei Liu if (err < 0) { 170460ce86c7SWei Liu return err; 170560ce86c7SWei Liu } 170660ce86c7SWei Liu offset += err; 170760ce86c7SWei Liu } 170860ce86c7SWei Liu return offset; 170960ce86c7SWei Liu } 171060ce86c7SWei Liu 1711fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1712fff39a7aSGreg Kurz { 1713fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1714fff39a7aSGreg Kurz } 1715fff39a7aSGreg Kurz 171656f101ecSGreg Kurz static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) 171756f101ecSGreg Kurz { 17188bf27550SChristian Schoenebeck return qid1->path != qid2->path; 171956f101ecSGreg Kurz } 172056f101ecSGreg Kurz 17218440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 172260ce86c7SWei Liu { 172360ce86c7SWei Liu int name_idx; 172460ce86c7SWei Liu V9fsQID *qids = NULL; 172560ce86c7SWei Liu int i, err = 0; 172660ce86c7SWei Liu V9fsPath dpath, path; 172760ce86c7SWei Liu uint16_t nwnames; 172860ce86c7SWei Liu struct stat stbuf; 172960ce86c7SWei Liu size_t offset = 7; 173060ce86c7SWei Liu int32_t fid, newfid; 173160ce86c7SWei Liu V9fsString *wnames = NULL; 173260ce86c7SWei Liu V9fsFidState *fidp; 173360ce86c7SWei Liu V9fsFidState *newfidp = NULL; 173460ce86c7SWei Liu V9fsPDU *pdu = opaque; 173560ce86c7SWei Liu V9fsState *s = pdu->s; 173656f101ecSGreg Kurz V9fsQID qid; 173760ce86c7SWei Liu 173860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 173960ce86c7SWei Liu if (err < 0) { 174060ce86c7SWei Liu pdu_complete(pdu, err); 174160ce86c7SWei Liu return ; 174260ce86c7SWei Liu } 174360ce86c7SWei Liu offset += err; 174460ce86c7SWei Liu 174560ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 174660ce86c7SWei Liu 1747232a4d2cSChristian Schoenebeck if (nwnames > P9_MAXWELEM) { 1748232a4d2cSChristian Schoenebeck err = -EINVAL; 1749232a4d2cSChristian Schoenebeck goto out_nofid; 1750232a4d2cSChristian Schoenebeck } 1751232a4d2cSChristian Schoenebeck if (nwnames) { 17521923923bSGreg Kurz wnames = g_new0(V9fsString, nwnames); 17531923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 175460ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 175560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 175660ce86c7SWei Liu if (err < 0) { 175760ce86c7SWei Liu goto out_nofid; 175860ce86c7SWei Liu } 1759fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1760fff39a7aSGreg Kurz err = -ENOENT; 1761fff39a7aSGreg Kurz goto out_nofid; 1762fff39a7aSGreg Kurz } 176360ce86c7SWei Liu offset += err; 176460ce86c7SWei Liu } 176560ce86c7SWei Liu } 176660ce86c7SWei Liu fidp = get_fid(pdu, fid); 176760ce86c7SWei Liu if (fidp == NULL) { 176860ce86c7SWei Liu err = -ENOENT; 176960ce86c7SWei Liu goto out_nofid; 177060ce86c7SWei Liu } 177156f101ecSGreg Kurz 177213fd08e6SGreg Kurz v9fs_path_init(&dpath); 177313fd08e6SGreg Kurz v9fs_path_init(&path); 177413fd08e6SGreg Kurz 177556f101ecSGreg Kurz err = fid_to_qid(pdu, fidp, &qid); 177656f101ecSGreg Kurz if (err < 0) { 177756f101ecSGreg Kurz goto out; 177856f101ecSGreg Kurz } 177956f101ecSGreg Kurz 178060ce86c7SWei Liu /* 178160ce86c7SWei Liu * Both dpath and path initially poin to fidp. 178260ce86c7SWei Liu * Needed to handle request with nwnames == 0 178360ce86c7SWei Liu */ 178460ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 178560ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 178660ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 178756f101ecSGreg Kurz if (not_same_qid(&pdu->s->root_qid, &qid) || 178856f101ecSGreg Kurz strcmp("..", wnames[name_idx].data)) { 178956f101ecSGreg Kurz err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, 179056f101ecSGreg Kurz &path); 179160ce86c7SWei Liu if (err < 0) { 179260ce86c7SWei Liu goto out; 179360ce86c7SWei Liu } 179456f101ecSGreg Kurz 179560ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 179660ce86c7SWei Liu if (err < 0) { 179760ce86c7SWei Liu goto out; 179860ce86c7SWei Liu } 17993b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18003b5ee9e8SAntonios Motakis if (err < 0) { 18013b5ee9e8SAntonios Motakis goto out; 18023b5ee9e8SAntonios Motakis } 180360ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 180460ce86c7SWei Liu } 180556f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 180656f101ecSGreg Kurz } 180760ce86c7SWei Liu if (fid == newfid) { 180849dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 180949dd946bSGreg Kurz err = -EINVAL; 181049dd946bSGreg Kurz goto out; 181149dd946bSGreg Kurz } 18125b3c77aaSGreg Kurz v9fs_path_write_lock(s); 181360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 18145b3c77aaSGreg Kurz v9fs_path_unlock(s); 181560ce86c7SWei Liu } else { 181660ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 181760ce86c7SWei Liu if (newfidp == NULL) { 181860ce86c7SWei Liu err = -EINVAL; 181960ce86c7SWei Liu goto out; 182060ce86c7SWei Liu } 182160ce86c7SWei Liu newfidp->uid = fidp->uid; 182260ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 182360ce86c7SWei Liu } 182460ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 182560ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 182660ce86c7SWei Liu out: 182760ce86c7SWei Liu put_fid(pdu, fidp); 182860ce86c7SWei Liu if (newfidp) { 182960ce86c7SWei Liu put_fid(pdu, newfidp); 183060ce86c7SWei Liu } 183160ce86c7SWei Liu v9fs_path_free(&dpath); 183260ce86c7SWei Liu v9fs_path_free(&path); 183360ce86c7SWei Liu out_nofid: 183460ce86c7SWei Liu pdu_complete(pdu, err); 183560ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 183660ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 183760ce86c7SWei Liu v9fs_string_free(&wnames[name_idx]); 183860ce86c7SWei Liu } 183960ce86c7SWei Liu g_free(wnames); 184060ce86c7SWei Liu g_free(qids); 184160ce86c7SWei Liu } 184260ce86c7SWei Liu } 184360ce86c7SWei Liu 18448440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 184560ce86c7SWei Liu { 184660ce86c7SWei Liu struct statfs stbuf; 184760ce86c7SWei Liu int32_t iounit = 0; 184860ce86c7SWei Liu V9fsState *s = pdu->s; 184960ce86c7SWei Liu 185060ce86c7SWei Liu /* 185160ce86c7SWei Liu * iounit should be multiples of f_bsize (host filesystem block size 185260ce86c7SWei Liu * and as well as less than (client msize - P9_IOHDRSZ)) 185360ce86c7SWei Liu */ 185460ce86c7SWei Liu if (!v9fs_co_statfs(pdu, path, &stbuf)) { 185568d654daSDan Schatzberg if (stbuf.f_bsize) { 185660ce86c7SWei Liu iounit = stbuf.f_bsize; 185760ce86c7SWei Liu iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; 185860ce86c7SWei Liu } 185968d654daSDan Schatzberg } 186060ce86c7SWei Liu if (!iounit) { 186160ce86c7SWei Liu iounit = s->msize - P9_IOHDRSZ; 186260ce86c7SWei Liu } 186360ce86c7SWei Liu return iounit; 186460ce86c7SWei Liu } 186560ce86c7SWei Liu 18668440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 186760ce86c7SWei Liu { 186860ce86c7SWei Liu int flags; 186960ce86c7SWei Liu int32_t fid; 187060ce86c7SWei Liu int32_t mode; 187160ce86c7SWei Liu V9fsQID qid; 187260ce86c7SWei Liu int iounit = 0; 187360ce86c7SWei Liu ssize_t err = 0; 187460ce86c7SWei Liu size_t offset = 7; 187560ce86c7SWei Liu struct stat stbuf; 187660ce86c7SWei Liu V9fsFidState *fidp; 187760ce86c7SWei Liu V9fsPDU *pdu = opaque; 187860ce86c7SWei Liu V9fsState *s = pdu->s; 187960ce86c7SWei Liu 188060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 188160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 188260ce86c7SWei Liu } else { 188360ce86c7SWei Liu uint8_t modebyte; 188460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 188560ce86c7SWei Liu mode = modebyte; 188660ce86c7SWei Liu } 188760ce86c7SWei Liu if (err < 0) { 188860ce86c7SWei Liu goto out_nofid; 188960ce86c7SWei Liu } 189060ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 189160ce86c7SWei Liu 189260ce86c7SWei Liu fidp = get_fid(pdu, fid); 189360ce86c7SWei Liu if (fidp == NULL) { 189460ce86c7SWei Liu err = -ENOENT; 189560ce86c7SWei Liu goto out_nofid; 189660ce86c7SWei Liu } 189749dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 189849dd946bSGreg Kurz err = -EINVAL; 189949dd946bSGreg Kurz goto out; 190049dd946bSGreg Kurz } 190160ce86c7SWei Liu 190260ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 190360ce86c7SWei Liu if (err < 0) { 190460ce86c7SWei Liu goto out; 190560ce86c7SWei Liu } 19063b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19073b5ee9e8SAntonios Motakis if (err < 0) { 19083b5ee9e8SAntonios Motakis goto out; 19093b5ee9e8SAntonios Motakis } 191060ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 191160ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 191260ce86c7SWei Liu if (err < 0) { 191360ce86c7SWei Liu goto out; 191460ce86c7SWei Liu } 191560ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 191660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 191760ce86c7SWei Liu if (err < 0) { 191860ce86c7SWei Liu goto out; 191960ce86c7SWei Liu } 192060ce86c7SWei Liu err += offset; 192160ce86c7SWei Liu } else { 192260ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 192360ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 192460ce86c7SWei Liu } else { 192560ce86c7SWei Liu flags = omode_to_uflags(mode); 192660ce86c7SWei Liu } 192760ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 192860ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 192960ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 193060ce86c7SWei Liu err = -EROFS; 193160ce86c7SWei Liu goto out; 193260ce86c7SWei Liu } 193360ce86c7SWei Liu } 193460ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 193560ce86c7SWei Liu if (err < 0) { 193660ce86c7SWei Liu goto out; 193760ce86c7SWei Liu } 193860ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 193960ce86c7SWei Liu fidp->open_flags = flags; 194060ce86c7SWei Liu if (flags & O_EXCL) { 194160ce86c7SWei Liu /* 194260ce86c7SWei Liu * We let the host file system do O_EXCL check 194360ce86c7SWei Liu * We should not reclaim such fd 194460ce86c7SWei Liu */ 194560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 194660ce86c7SWei Liu } 194760ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 194860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 194960ce86c7SWei Liu if (err < 0) { 195060ce86c7SWei Liu goto out; 195160ce86c7SWei Liu } 195260ce86c7SWei Liu err += offset; 195360ce86c7SWei Liu } 195460ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 195560ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 195660ce86c7SWei Liu out: 195760ce86c7SWei Liu put_fid(pdu, fidp); 195860ce86c7SWei Liu out_nofid: 195960ce86c7SWei Liu pdu_complete(pdu, err); 196060ce86c7SWei Liu } 196160ce86c7SWei Liu 19628440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 196360ce86c7SWei Liu { 196460ce86c7SWei Liu int32_t dfid, flags, mode; 196560ce86c7SWei Liu gid_t gid; 196660ce86c7SWei Liu ssize_t err = 0; 196760ce86c7SWei Liu ssize_t offset = 7; 196860ce86c7SWei Liu V9fsString name; 196960ce86c7SWei Liu V9fsFidState *fidp; 197060ce86c7SWei Liu struct stat stbuf; 197160ce86c7SWei Liu V9fsQID qid; 197260ce86c7SWei Liu int32_t iounit; 197360ce86c7SWei Liu V9fsPDU *pdu = opaque; 197460ce86c7SWei Liu 197560ce86c7SWei Liu v9fs_string_init(&name); 197660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 197760ce86c7SWei Liu &name, &flags, &mode, &gid); 197860ce86c7SWei Liu if (err < 0) { 197960ce86c7SWei Liu goto out_nofid; 198060ce86c7SWei Liu } 198160ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 198260ce86c7SWei Liu 1983fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 1984fff39a7aSGreg Kurz err = -ENOENT; 1985fff39a7aSGreg Kurz goto out_nofid; 1986fff39a7aSGreg Kurz } 1987fff39a7aSGreg Kurz 1988805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 1989805b5d98SGreg Kurz err = -EEXIST; 1990805b5d98SGreg Kurz goto out_nofid; 1991805b5d98SGreg Kurz } 1992805b5d98SGreg Kurz 199360ce86c7SWei Liu fidp = get_fid(pdu, dfid); 199460ce86c7SWei Liu if (fidp == NULL) { 199560ce86c7SWei Liu err = -ENOENT; 199660ce86c7SWei Liu goto out_nofid; 199760ce86c7SWei Liu } 1998d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 1999d63fb193SLi Qiang err = -EINVAL; 2000d63fb193SLi Qiang goto out; 2001d63fb193SLi Qiang } 200260ce86c7SWei Liu 200360ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 200460ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 200560ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 200660ce86c7SWei Liu if (err < 0) { 200760ce86c7SWei Liu goto out; 200860ce86c7SWei Liu } 200960ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 201060ce86c7SWei Liu fidp->open_flags = flags; 201160ce86c7SWei Liu if (flags & O_EXCL) { 201260ce86c7SWei Liu /* 201360ce86c7SWei Liu * We let the host file system do O_EXCL check 201460ce86c7SWei Liu * We should not reclaim such fd 201560ce86c7SWei Liu */ 201660ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 201760ce86c7SWei Liu } 201860ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20193b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20203b5ee9e8SAntonios Motakis if (err < 0) { 20213b5ee9e8SAntonios Motakis goto out; 20223b5ee9e8SAntonios Motakis } 202360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 202460ce86c7SWei Liu if (err < 0) { 202560ce86c7SWei Liu goto out; 202660ce86c7SWei Liu } 202760ce86c7SWei Liu err += offset; 202860ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 202960ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 203060ce86c7SWei Liu out: 203160ce86c7SWei Liu put_fid(pdu, fidp); 203260ce86c7SWei Liu out_nofid: 203360ce86c7SWei Liu pdu_complete(pdu, err); 203460ce86c7SWei Liu v9fs_string_free(&name); 203560ce86c7SWei Liu } 203660ce86c7SWei Liu 2037a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 203860ce86c7SWei Liu { 203960ce86c7SWei Liu int err; 204060ce86c7SWei Liu int32_t fid; 204160ce86c7SWei Liu int datasync; 204260ce86c7SWei Liu size_t offset = 7; 204360ce86c7SWei Liu V9fsFidState *fidp; 204460ce86c7SWei Liu V9fsPDU *pdu = opaque; 204560ce86c7SWei Liu 204660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 204760ce86c7SWei Liu if (err < 0) { 204860ce86c7SWei Liu goto out_nofid; 204960ce86c7SWei Liu } 205060ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 205160ce86c7SWei Liu 205260ce86c7SWei Liu fidp = get_fid(pdu, fid); 205360ce86c7SWei Liu if (fidp == NULL) { 205460ce86c7SWei Liu err = -ENOENT; 205560ce86c7SWei Liu goto out_nofid; 205660ce86c7SWei Liu } 205760ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 205860ce86c7SWei Liu if (!err) { 205960ce86c7SWei Liu err = offset; 206060ce86c7SWei Liu } 206160ce86c7SWei Liu put_fid(pdu, fidp); 206260ce86c7SWei Liu out_nofid: 206360ce86c7SWei Liu pdu_complete(pdu, err); 206460ce86c7SWei Liu } 206560ce86c7SWei Liu 20668440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 206760ce86c7SWei Liu { 206860ce86c7SWei Liu int err; 206960ce86c7SWei Liu int32_t fid; 207060ce86c7SWei Liu size_t offset = 7; 207160ce86c7SWei Liu V9fsFidState *fidp; 207260ce86c7SWei Liu V9fsPDU *pdu = opaque; 207360ce86c7SWei Liu V9fsState *s = pdu->s; 207460ce86c7SWei Liu 207560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 207660ce86c7SWei Liu if (err < 0) { 207760ce86c7SWei Liu goto out_nofid; 207860ce86c7SWei Liu } 207960ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 208060ce86c7SWei Liu 208160ce86c7SWei Liu fidp = clunk_fid(s, fid); 208260ce86c7SWei Liu if (fidp == NULL) { 208360ce86c7SWei Liu err = -ENOENT; 208460ce86c7SWei Liu goto out_nofid; 208560ce86c7SWei Liu } 208660ce86c7SWei Liu /* 208760ce86c7SWei Liu * Bump the ref so that put_fid will 208860ce86c7SWei Liu * free the fid. 208960ce86c7SWei Liu */ 209060ce86c7SWei Liu fidp->ref++; 209160ce86c7SWei Liu err = put_fid(pdu, fidp); 209260ce86c7SWei Liu if (!err) { 209360ce86c7SWei Liu err = offset; 209460ce86c7SWei Liu } 209560ce86c7SWei Liu out_nofid: 209660ce86c7SWei Liu pdu_complete(pdu, err); 209760ce86c7SWei Liu } 209860ce86c7SWei Liu 2099bcb8998fSStefano Stabellini /* 2100bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2101bcb8998fSStefano Stabellini * 2102bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2103bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2104bcb8998fSStefano Stabellini * @size: number of bytes to include 2105bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2106bcb8998fSStefano Stabellini * 2107bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2108bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2109bcb8998fSStefano Stabellini */ 2110bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2111cf45183bSStefano Stabellini size_t skip, size_t size, 2112bcb8998fSStefano Stabellini bool is_write) 2113bcb8998fSStefano Stabellini { 2114bcb8998fSStefano Stabellini QEMUIOVector elem; 2115bcb8998fSStefano Stabellini struct iovec *iov; 2116bcb8998fSStefano Stabellini unsigned int niov; 2117bcb8998fSStefano Stabellini 211888da0b03SStefano Stabellini if (is_write) { 2119cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 212088da0b03SStefano Stabellini } else { 2121cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 212288da0b03SStefano Stabellini } 2123bcb8998fSStefano Stabellini 2124bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2125bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2126cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2127bcb8998fSStefano Stabellini } 2128bcb8998fSStefano Stabellini 212960ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 213060ce86c7SWei Liu uint64_t off, uint32_t max_count) 213160ce86c7SWei Liu { 213260ce86c7SWei Liu ssize_t err; 213360ce86c7SWei Liu size_t offset = 7; 2134cf45183bSStefano Stabellini uint64_t read_count; 2135bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 213660ce86c7SWei Liu 21377e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21387e55d65cSLi Qiang read_count = 0; 213916724a17SGreg Kurz } else { 2140cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2141cf45183bSStefano Stabellini } 2142cf45183bSStefano Stabellini if (read_count > max_count) { 214360ce86c7SWei Liu read_count = max_count; 214460ce86c7SWei Liu } 214560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 214660ce86c7SWei Liu if (err < 0) { 214760ce86c7SWei Liu return err; 214860ce86c7SWei Liu } 214960ce86c7SWei Liu offset += err; 215000588a0aSWei Liu 2151cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2152fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 215360ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 215460ce86c7SWei Liu read_count); 2155bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 215660ce86c7SWei Liu if (err < 0) { 215760ce86c7SWei Liu return err; 215860ce86c7SWei Liu } 215960ce86c7SWei Liu offset += err; 216060ce86c7SWei Liu return offset; 216160ce86c7SWei Liu } 216260ce86c7SWei Liu 21638440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 21648440e22eSGreg Kurz V9fsFidState *fidp, 21658440e22eSGreg Kurz uint32_t max_count) 216660ce86c7SWei Liu { 216760ce86c7SWei Liu V9fsPath path; 216860ce86c7SWei Liu V9fsStat v9stat; 216960ce86c7SWei Liu int len, err = 0; 217060ce86c7SWei Liu int32_t count = 0; 217160ce86c7SWei Liu struct stat stbuf; 217260ce86c7SWei Liu off_t saved_dir_pos; 2173635324e8SGreg Kurz struct dirent *dent; 217460ce86c7SWei Liu 217560ce86c7SWei Liu /* save the directory position */ 217660ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 217760ce86c7SWei Liu if (saved_dir_pos < 0) { 217860ce86c7SWei Liu return saved_dir_pos; 217960ce86c7SWei Liu } 218060ce86c7SWei Liu 218160ce86c7SWei Liu while (1) { 218260ce86c7SWei Liu v9fs_path_init(&path); 21837cde47d4SGreg Kurz 21847cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 21857cde47d4SGreg Kurz 2186635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2187635324e8SGreg Kurz if (err || !dent) { 218860ce86c7SWei Liu break; 218960ce86c7SWei Liu } 219060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 219160ce86c7SWei Liu if (err < 0) { 21928762a46dSGreg Kurz break; 219360ce86c7SWei Liu } 219460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 219560ce86c7SWei Liu if (err < 0) { 21968762a46dSGreg Kurz break; 219760ce86c7SWei Liu } 21986069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 219960ce86c7SWei Liu if (err < 0) { 22008762a46dSGreg Kurz break; 220160ce86c7SWei Liu } 2202772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 22037cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22047cde47d4SGreg Kurz 220560ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 220660ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 220760ce86c7SWei Liu v9fs_stat_free(&v9stat); 220860ce86c7SWei Liu v9fs_path_free(&path); 220960ce86c7SWei Liu return count; 221060ce86c7SWei Liu } 2211772a7369SJan Dakinevich 2212772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2213772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2214772a7369SJan Dakinevich 2215772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2216772a7369SJan Dakinevich 2217772a7369SJan Dakinevich if (len < 0) { 2218772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2219772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2220772a7369SJan Dakinevich v9fs_path_free(&path); 2221772a7369SJan Dakinevich return len; 2222772a7369SJan Dakinevich } 222360ce86c7SWei Liu count += len; 222460ce86c7SWei Liu v9fs_stat_free(&v9stat); 222560ce86c7SWei Liu v9fs_path_free(&path); 222660ce86c7SWei Liu saved_dir_pos = dent->d_off; 222760ce86c7SWei Liu } 22288762a46dSGreg Kurz 22297cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22307cde47d4SGreg Kurz 223160ce86c7SWei Liu v9fs_path_free(&path); 223260ce86c7SWei Liu if (err < 0) { 223360ce86c7SWei Liu return err; 223460ce86c7SWei Liu } 223560ce86c7SWei Liu return count; 223660ce86c7SWei Liu } 223760ce86c7SWei Liu 22388440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 223960ce86c7SWei Liu { 224060ce86c7SWei Liu int32_t fid; 224160ce86c7SWei Liu uint64_t off; 224260ce86c7SWei Liu ssize_t err = 0; 224360ce86c7SWei Liu int32_t count = 0; 224460ce86c7SWei Liu size_t offset = 7; 224560ce86c7SWei Liu uint32_t max_count; 224660ce86c7SWei Liu V9fsFidState *fidp; 224760ce86c7SWei Liu V9fsPDU *pdu = opaque; 224860ce86c7SWei Liu V9fsState *s = pdu->s; 224960ce86c7SWei Liu 225060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 225160ce86c7SWei Liu if (err < 0) { 225260ce86c7SWei Liu goto out_nofid; 225360ce86c7SWei Liu } 225460ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 225560ce86c7SWei Liu 225660ce86c7SWei Liu fidp = get_fid(pdu, fid); 225760ce86c7SWei Liu if (fidp == NULL) { 225860ce86c7SWei Liu err = -EINVAL; 225960ce86c7SWei Liu goto out_nofid; 226060ce86c7SWei Liu } 226160ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2262d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2263d2c5cf7cSChristian Schoenebeck warn_report_once( 2264d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2265d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2266d2c5cf7cSChristian Schoenebeck ); 2267d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2268d2c5cf7cSChristian Schoenebeck goto out; 2269d2c5cf7cSChristian Schoenebeck } 227060ce86c7SWei Liu if (off == 0) { 227160ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 227260ce86c7SWei Liu } 227360ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 227460ce86c7SWei Liu if (count < 0) { 227560ce86c7SWei Liu err = count; 227660ce86c7SWei Liu goto out; 227760ce86c7SWei Liu } 227860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 227960ce86c7SWei Liu if (err < 0) { 228060ce86c7SWei Liu goto out; 228160ce86c7SWei Liu } 228260ce86c7SWei Liu err += offset + count; 228360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 228460ce86c7SWei Liu QEMUIOVector qiov_full; 228560ce86c7SWei Liu QEMUIOVector qiov; 228660ce86c7SWei Liu int32_t len; 228760ce86c7SWei Liu 2288cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 228960ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 229060ce86c7SWei Liu do { 229160ce86c7SWei Liu qemu_iovec_reset(&qiov); 229260ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 229360ce86c7SWei Liu if (0) { 229460ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 229560ce86c7SWei Liu } 229660ce86c7SWei Liu /* Loop in case of EINTR */ 229760ce86c7SWei Liu do { 229860ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 229960ce86c7SWei Liu if (len >= 0) { 230060ce86c7SWei Liu off += len; 230160ce86c7SWei Liu count += len; 230260ce86c7SWei Liu } 230360ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 230460ce86c7SWei Liu if (len < 0) { 230560ce86c7SWei Liu /* IO error return the error */ 230660ce86c7SWei Liu err = len; 2307e95c9a49SLi Qiang goto out_free_iovec; 230860ce86c7SWei Liu } 230960ce86c7SWei Liu } while (count < max_count && len > 0); 231060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 231160ce86c7SWei Liu if (err < 0) { 2312e95c9a49SLi Qiang goto out_free_iovec; 231360ce86c7SWei Liu } 231460ce86c7SWei Liu err += offset + count; 2315e95c9a49SLi Qiang out_free_iovec: 231660ce86c7SWei Liu qemu_iovec_destroy(&qiov); 231760ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 231860ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 231960ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 232060ce86c7SWei Liu } else { 232160ce86c7SWei Liu err = -EINVAL; 232260ce86c7SWei Liu } 232360ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 232460ce86c7SWei Liu out: 232560ce86c7SWei Liu put_fid(pdu, fidp); 232660ce86c7SWei Liu out_nofid: 232760ce86c7SWei Liu pdu_complete(pdu, err); 232860ce86c7SWei Liu } 232960ce86c7SWei Liu 233029c9d2caSChristian Schoenebeck /** 233129c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 233229c9d2caSChristian Schoenebeck * 233329c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 233429c9d2caSChristian Schoenebeck * @returns required size in bytes 233529c9d2caSChristian Schoenebeck */ 233629c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 233760ce86c7SWei Liu { 233860ce86c7SWei Liu /* 233960ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 234060ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 234160ce86c7SWei Liu */ 234260ce86c7SWei Liu return 24 + v9fs_string_size(name); 234360ce86c7SWei Liu } 234460ce86c7SWei Liu 23450c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 23460c4356baSChristian Schoenebeck { 23470c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 23480c4356baSChristian Schoenebeck 23490c4356baSChristian Schoenebeck for (; e; e = next) { 23500c4356baSChristian Schoenebeck next = e->next; 23510c4356baSChristian Schoenebeck g_free(e->dent); 23520c4356baSChristian Schoenebeck g_free(e->st); 23530c4356baSChristian Schoenebeck g_free(e); 23540c4356baSChristian Schoenebeck } 23550c4356baSChristian Schoenebeck } 23560c4356baSChristian Schoenebeck 23578440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 23580c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 235960ce86c7SWei Liu { 236060ce86c7SWei Liu size_t size; 236160ce86c7SWei Liu V9fsQID qid; 236260ce86c7SWei Liu V9fsString name; 236360ce86c7SWei Liu int len, err = 0; 236460ce86c7SWei Liu int32_t count = 0; 2365635324e8SGreg Kurz struct dirent *dent; 23660c4356baSChristian Schoenebeck struct stat *st; 23670c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 236860ce86c7SWei Liu 23690c4356baSChristian Schoenebeck /* 23700c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 23710c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 23720c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 23730c4356baSChristian Schoenebeck */ 23740c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 23750c4356baSChristian Schoenebeck 23760c4356baSChristian Schoenebeck /* 23770c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 23780c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 23790c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 23800c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 23810c4356baSChristian Schoenebeck */ 23820c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 23830c4356baSChristian Schoenebeck dostat); 23840c4356baSChristian Schoenebeck if (count < 0) { 23850c4356baSChristian Schoenebeck err = count; 23860c4356baSChristian Schoenebeck count = 0; 23870c4356baSChristian Schoenebeck goto out; 238860ce86c7SWei Liu } 23890c4356baSChristian Schoenebeck count = 0; 239060ce86c7SWei Liu 23910c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 23920c4356baSChristian Schoenebeck dent = e->dent; 23931a6ed33cSAntonios Motakis 23941a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 23950c4356baSChristian Schoenebeck st = e->st; 23960c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 23970c4356baSChristian Schoenebeck if (!st) { 23980c4356baSChristian Schoenebeck err = -1; 23990c4356baSChristian Schoenebeck break; 24000c4356baSChristian Schoenebeck } 24010c4356baSChristian Schoenebeck 24020c4356baSChristian Schoenebeck /* remap inode */ 24030c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 24041a6ed33cSAntonios Motakis if (err < 0) { 24050c4356baSChristian Schoenebeck break; 24061a6ed33cSAntonios Motakis } 24071a6ed33cSAntonios Motakis } else { 240860ce86c7SWei Liu /* 240960ce86c7SWei Liu * Fill up just the path field of qid because the client uses 241060ce86c7SWei Liu * only that. To fill the entire qid structure we will have 24111a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 24120c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 24131a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 24141a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 24151a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 24161a6ed33cSAntonios Motakis * files/dirs through other ways. 241760ce86c7SWei Liu */ 241860ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 241960ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 242060ce86c7SWei Liu /* Fill the other fields with dummy values */ 242160ce86c7SWei Liu qid.type = 0; 242260ce86c7SWei Liu qid.version = 0; 24231a6ed33cSAntonios Motakis } 242460ce86c7SWei Liu 24250c4356baSChristian Schoenebeck v9fs_string_init(&name); 24260c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24270c4356baSChristian Schoenebeck 242860ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 242960ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 243060ce86c7SWei Liu &qid, dent->d_off, 243160ce86c7SWei Liu dent->d_type, &name); 24327cde47d4SGreg Kurz 24330c4356baSChristian Schoenebeck v9fs_string_free(&name); 24347cde47d4SGreg Kurz 243560ce86c7SWei Liu if (len < 0) { 24360c4356baSChristian Schoenebeck err = len; 24370c4356baSChristian Schoenebeck break; 243860ce86c7SWei Liu } 24390c4356baSChristian Schoenebeck 244060ce86c7SWei Liu count += len; 244160ce86c7SWei Liu } 24427cde47d4SGreg Kurz 24430c4356baSChristian Schoenebeck out: 24440c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 244560ce86c7SWei Liu if (err < 0) { 244660ce86c7SWei Liu return err; 244760ce86c7SWei Liu } 244860ce86c7SWei Liu return count; 244960ce86c7SWei Liu } 245060ce86c7SWei Liu 24518440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 245260ce86c7SWei Liu { 245360ce86c7SWei Liu int32_t fid; 245460ce86c7SWei Liu V9fsFidState *fidp; 245560ce86c7SWei Liu ssize_t retval = 0; 245660ce86c7SWei Liu size_t offset = 7; 245760ce86c7SWei Liu uint64_t initial_offset; 245860ce86c7SWei Liu int32_t count; 245960ce86c7SWei Liu uint32_t max_count; 246060ce86c7SWei Liu V9fsPDU *pdu = opaque; 2461d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 246260ce86c7SWei Liu 246360ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 246460ce86c7SWei Liu &initial_offset, &max_count); 246560ce86c7SWei Liu if (retval < 0) { 246660ce86c7SWei Liu goto out_nofid; 246760ce86c7SWei Liu } 246860ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 246960ce86c7SWei Liu 2470d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2471d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2472d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2473d36a5c22SChristian Schoenebeck warn_report_once( 2474d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2475d36a5c22SChristian Schoenebeck ); 2476d36a5c22SChristian Schoenebeck } 2477d36a5c22SChristian Schoenebeck 247860ce86c7SWei Liu fidp = get_fid(pdu, fid); 247960ce86c7SWei Liu if (fidp == NULL) { 248060ce86c7SWei Liu retval = -EINVAL; 248160ce86c7SWei Liu goto out_nofid; 248260ce86c7SWei Liu } 2483f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 248460ce86c7SWei Liu retval = -EINVAL; 248560ce86c7SWei Liu goto out; 248660ce86c7SWei Liu } 2487d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2488d2c5cf7cSChristian Schoenebeck warn_report_once( 2489d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2490d2c5cf7cSChristian Schoenebeck "protocol version" 2491d2c5cf7cSChristian Schoenebeck ); 2492d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2493d2c5cf7cSChristian Schoenebeck goto out; 2494d2c5cf7cSChristian Schoenebeck } 24950c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 249660ce86c7SWei Liu if (count < 0) { 249760ce86c7SWei Liu retval = count; 249860ce86c7SWei Liu goto out; 249960ce86c7SWei Liu } 250060ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 250160ce86c7SWei Liu if (retval < 0) { 250260ce86c7SWei Liu goto out; 250360ce86c7SWei Liu } 250460ce86c7SWei Liu retval += count + offset; 250560ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 250660ce86c7SWei Liu out: 250760ce86c7SWei Liu put_fid(pdu, fidp); 250860ce86c7SWei Liu out_nofid: 250960ce86c7SWei Liu pdu_complete(pdu, retval); 251060ce86c7SWei Liu } 251160ce86c7SWei Liu 251260ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 251360ce86c7SWei Liu uint64_t off, uint32_t count, 251460ce86c7SWei Liu struct iovec *sg, int cnt) 251560ce86c7SWei Liu { 251660ce86c7SWei Liu int i, to_copy; 251760ce86c7SWei Liu ssize_t err = 0; 25187e55d65cSLi Qiang uint64_t write_count; 251960ce86c7SWei Liu size_t offset = 7; 252060ce86c7SWei Liu 252160ce86c7SWei Liu 25227e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2523b858e80aSDaniel Henrique Barboza return -ENOSPC; 252460ce86c7SWei Liu } 25257e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 25267e55d65cSLi Qiang if (write_count > count) { 25277e55d65cSLi Qiang write_count = count; 25287e55d65cSLi Qiang } 252960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 253060ce86c7SWei Liu if (err < 0) { 253160ce86c7SWei Liu return err; 253260ce86c7SWei Liu } 253360ce86c7SWei Liu err += offset; 253460ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 253560ce86c7SWei Liu /* 253660ce86c7SWei Liu * Now copy the content from sg list 253760ce86c7SWei Liu */ 253860ce86c7SWei Liu for (i = 0; i < cnt; i++) { 253960ce86c7SWei Liu if (write_count > sg[i].iov_len) { 254060ce86c7SWei Liu to_copy = sg[i].iov_len; 254160ce86c7SWei Liu } else { 254260ce86c7SWei Liu to_copy = write_count; 254360ce86c7SWei Liu } 254460ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 254560ce86c7SWei Liu /* updating vs->off since we are not using below */ 254660ce86c7SWei Liu off += to_copy; 254760ce86c7SWei Liu write_count -= to_copy; 254860ce86c7SWei Liu } 2549b858e80aSDaniel Henrique Barboza 255060ce86c7SWei Liu return err; 255160ce86c7SWei Liu } 255260ce86c7SWei Liu 25538440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 255460ce86c7SWei Liu { 255560ce86c7SWei Liu ssize_t err; 255660ce86c7SWei Liu int32_t fid; 255760ce86c7SWei Liu uint64_t off; 255860ce86c7SWei Liu uint32_t count; 255960ce86c7SWei Liu int32_t len = 0; 256060ce86c7SWei Liu int32_t total = 0; 256160ce86c7SWei Liu size_t offset = 7; 256260ce86c7SWei Liu V9fsFidState *fidp; 256360ce86c7SWei Liu V9fsPDU *pdu = opaque; 256460ce86c7SWei Liu V9fsState *s = pdu->s; 256560ce86c7SWei Liu QEMUIOVector qiov_full; 256660ce86c7SWei Liu QEMUIOVector qiov; 256760ce86c7SWei Liu 256860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 256960ce86c7SWei Liu if (err < 0) { 257060ce86c7SWei Liu pdu_complete(pdu, err); 257160ce86c7SWei Liu return; 257260ce86c7SWei Liu } 257360ce86c7SWei Liu offset += err; 2574cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 257560ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 257660ce86c7SWei Liu 257760ce86c7SWei Liu fidp = get_fid(pdu, fid); 257860ce86c7SWei Liu if (fidp == NULL) { 257960ce86c7SWei Liu err = -EINVAL; 258060ce86c7SWei Liu goto out_nofid; 258160ce86c7SWei Liu } 258260ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 258360ce86c7SWei Liu if (fidp->fs.fd == -1) { 258460ce86c7SWei Liu err = -EINVAL; 258560ce86c7SWei Liu goto out; 258660ce86c7SWei Liu } 258760ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 258860ce86c7SWei Liu /* 258960ce86c7SWei Liu * setxattr operation 259060ce86c7SWei Liu */ 259160ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 259260ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 259360ce86c7SWei Liu goto out; 259460ce86c7SWei Liu } else { 259560ce86c7SWei Liu err = -EINVAL; 259660ce86c7SWei Liu goto out; 259760ce86c7SWei Liu } 259860ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 259960ce86c7SWei Liu do { 260060ce86c7SWei Liu qemu_iovec_reset(&qiov); 260160ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 260260ce86c7SWei Liu if (0) { 260360ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 260460ce86c7SWei Liu } 260560ce86c7SWei Liu /* Loop in case of EINTR */ 260660ce86c7SWei Liu do { 260760ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 260860ce86c7SWei Liu if (len >= 0) { 260960ce86c7SWei Liu off += len; 261060ce86c7SWei Liu total += len; 261160ce86c7SWei Liu } 261260ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 261360ce86c7SWei Liu if (len < 0) { 261460ce86c7SWei Liu /* IO error return the error */ 261560ce86c7SWei Liu err = len; 261660ce86c7SWei Liu goto out_qiov; 261760ce86c7SWei Liu } 261860ce86c7SWei Liu } while (total < count && len > 0); 261960ce86c7SWei Liu 262060ce86c7SWei Liu offset = 7; 262160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 262260ce86c7SWei Liu if (err < 0) { 2623fdfcc9aeSLi Qiang goto out_qiov; 262460ce86c7SWei Liu } 262560ce86c7SWei Liu err += offset; 262660ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 262760ce86c7SWei Liu out_qiov: 262860ce86c7SWei Liu qemu_iovec_destroy(&qiov); 262960ce86c7SWei Liu out: 263060ce86c7SWei Liu put_fid(pdu, fidp); 263160ce86c7SWei Liu out_nofid: 263260ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 263360ce86c7SWei Liu pdu_complete(pdu, err); 263460ce86c7SWei Liu } 263560ce86c7SWei Liu 26368440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 263760ce86c7SWei Liu { 263860ce86c7SWei Liu int32_t fid; 263960ce86c7SWei Liu int err = 0; 264060ce86c7SWei Liu size_t offset = 7; 264160ce86c7SWei Liu V9fsFidState *fidp; 264260ce86c7SWei Liu V9fsQID qid; 264360ce86c7SWei Liu int32_t perm; 264460ce86c7SWei Liu int8_t mode; 264560ce86c7SWei Liu V9fsPath path; 264660ce86c7SWei Liu struct stat stbuf; 264760ce86c7SWei Liu V9fsString name; 264860ce86c7SWei Liu V9fsString extension; 264960ce86c7SWei Liu int iounit; 265060ce86c7SWei Liu V9fsPDU *pdu = opaque; 26515b3c77aaSGreg Kurz V9fsState *s = pdu->s; 265260ce86c7SWei Liu 265360ce86c7SWei Liu v9fs_path_init(&path); 265460ce86c7SWei Liu v9fs_string_init(&name); 265560ce86c7SWei Liu v9fs_string_init(&extension); 265660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 265760ce86c7SWei Liu &perm, &mode, &extension); 265860ce86c7SWei Liu if (err < 0) { 265960ce86c7SWei Liu goto out_nofid; 266060ce86c7SWei Liu } 266160ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 266260ce86c7SWei Liu 2663fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2664fff39a7aSGreg Kurz err = -ENOENT; 2665fff39a7aSGreg Kurz goto out_nofid; 2666fff39a7aSGreg Kurz } 2667fff39a7aSGreg Kurz 2668805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2669805b5d98SGreg Kurz err = -EEXIST; 2670805b5d98SGreg Kurz goto out_nofid; 2671805b5d98SGreg Kurz } 2672805b5d98SGreg Kurz 267360ce86c7SWei Liu fidp = get_fid(pdu, fid); 267460ce86c7SWei Liu if (fidp == NULL) { 267560ce86c7SWei Liu err = -EINVAL; 267660ce86c7SWei Liu goto out_nofid; 267760ce86c7SWei Liu } 2678d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2679d63fb193SLi Qiang err = -EINVAL; 2680d63fb193SLi Qiang goto out; 2681d63fb193SLi Qiang } 268260ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 268360ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 268460ce86c7SWei Liu fidp->uid, -1, &stbuf); 268560ce86c7SWei Liu if (err < 0) { 268660ce86c7SWei Liu goto out; 268760ce86c7SWei Liu } 268860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 268960ce86c7SWei Liu if (err < 0) { 269060ce86c7SWei Liu goto out; 269160ce86c7SWei Liu } 26925b3c77aaSGreg Kurz v9fs_path_write_lock(s); 269360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26945b3c77aaSGreg Kurz v9fs_path_unlock(s); 269560ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 269660ce86c7SWei Liu if (err < 0) { 269760ce86c7SWei Liu goto out; 269860ce86c7SWei Liu } 269960ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 270060ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 270160ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 270260ce86c7SWei Liu extension.data, -1 , &stbuf); 270360ce86c7SWei Liu if (err < 0) { 270460ce86c7SWei Liu goto out; 270560ce86c7SWei Liu } 270660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 270760ce86c7SWei Liu if (err < 0) { 270860ce86c7SWei Liu goto out; 270960ce86c7SWei Liu } 27105b3c77aaSGreg Kurz v9fs_path_write_lock(s); 271160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27125b3c77aaSGreg Kurz v9fs_path_unlock(s); 271360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 271460ce86c7SWei Liu int32_t ofid = atoi(extension.data); 271560ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 271660ce86c7SWei Liu if (ofidp == NULL) { 271760ce86c7SWei Liu err = -EINVAL; 271860ce86c7SWei Liu goto out; 271960ce86c7SWei Liu } 272060ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 272160ce86c7SWei Liu put_fid(pdu, ofidp); 272260ce86c7SWei Liu if (err < 0) { 272360ce86c7SWei Liu goto out; 272460ce86c7SWei Liu } 272560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 272660ce86c7SWei Liu if (err < 0) { 272760ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 272860ce86c7SWei Liu goto out; 272960ce86c7SWei Liu } 27305b3c77aaSGreg Kurz v9fs_path_write_lock(s); 273160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27325b3c77aaSGreg Kurz v9fs_path_unlock(s); 273360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 273460ce86c7SWei Liu if (err < 0) { 273560ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 273660ce86c7SWei Liu goto out; 273760ce86c7SWei Liu } 273860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 273960ce86c7SWei Liu char ctype; 274060ce86c7SWei Liu uint32_t major, minor; 274160ce86c7SWei Liu mode_t nmode = 0; 274260ce86c7SWei Liu 274360ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 274460ce86c7SWei Liu err = -errno; 274560ce86c7SWei Liu goto out; 274660ce86c7SWei Liu } 274760ce86c7SWei Liu 274860ce86c7SWei Liu switch (ctype) { 274960ce86c7SWei Liu case 'c': 275060ce86c7SWei Liu nmode = S_IFCHR; 275160ce86c7SWei Liu break; 275260ce86c7SWei Liu case 'b': 275360ce86c7SWei Liu nmode = S_IFBLK; 275460ce86c7SWei Liu break; 275560ce86c7SWei Liu default: 275660ce86c7SWei Liu err = -EIO; 275760ce86c7SWei Liu goto out; 275860ce86c7SWei Liu } 275960ce86c7SWei Liu 276060ce86c7SWei Liu nmode |= perm & 0777; 276160ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 276260ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 276360ce86c7SWei Liu if (err < 0) { 276460ce86c7SWei Liu goto out; 276560ce86c7SWei Liu } 276660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 276760ce86c7SWei Liu if (err < 0) { 276860ce86c7SWei Liu goto out; 276960ce86c7SWei Liu } 27705b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27725b3c77aaSGreg Kurz v9fs_path_unlock(s); 277360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 277460ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 277560ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 277660ce86c7SWei Liu if (err < 0) { 277760ce86c7SWei Liu goto out; 277860ce86c7SWei Liu } 277960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 278060ce86c7SWei Liu if (err < 0) { 278160ce86c7SWei Liu goto out; 278260ce86c7SWei Liu } 27835b3c77aaSGreg Kurz v9fs_path_write_lock(s); 278460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27855b3c77aaSGreg Kurz v9fs_path_unlock(s); 278660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 278760ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 278860ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 278960ce86c7SWei Liu if (err < 0) { 279060ce86c7SWei Liu goto out; 279160ce86c7SWei Liu } 279260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 279360ce86c7SWei Liu if (err < 0) { 279460ce86c7SWei Liu goto out; 279560ce86c7SWei Liu } 27965b3c77aaSGreg Kurz v9fs_path_write_lock(s); 279760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27985b3c77aaSGreg Kurz v9fs_path_unlock(s); 279960ce86c7SWei Liu } else { 280060ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 280160ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 280260ce86c7SWei Liu if (err < 0) { 280360ce86c7SWei Liu goto out; 280460ce86c7SWei Liu } 280560ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 280660ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 280760ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 280860ce86c7SWei Liu /* 280960ce86c7SWei Liu * We let the host file system do O_EXCL check 281060ce86c7SWei Liu * We should not reclaim such fd 281160ce86c7SWei Liu */ 281260ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 281360ce86c7SWei Liu } 281460ce86c7SWei Liu } 281560ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 28163b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28173b5ee9e8SAntonios Motakis if (err < 0) { 28183b5ee9e8SAntonios Motakis goto out; 28193b5ee9e8SAntonios Motakis } 282060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 282160ce86c7SWei Liu if (err < 0) { 282260ce86c7SWei Liu goto out; 282360ce86c7SWei Liu } 282460ce86c7SWei Liu err += offset; 282560ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 282660ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 282760ce86c7SWei Liu out: 282860ce86c7SWei Liu put_fid(pdu, fidp); 282960ce86c7SWei Liu out_nofid: 283060ce86c7SWei Liu pdu_complete(pdu, err); 283160ce86c7SWei Liu v9fs_string_free(&name); 283260ce86c7SWei Liu v9fs_string_free(&extension); 283360ce86c7SWei Liu v9fs_path_free(&path); 283460ce86c7SWei Liu } 283560ce86c7SWei Liu 28368440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 283760ce86c7SWei Liu { 283860ce86c7SWei Liu V9fsPDU *pdu = opaque; 283960ce86c7SWei Liu V9fsString name; 284060ce86c7SWei Liu V9fsString symname; 284160ce86c7SWei Liu V9fsFidState *dfidp; 284260ce86c7SWei Liu V9fsQID qid; 284360ce86c7SWei Liu struct stat stbuf; 284460ce86c7SWei Liu int32_t dfid; 284560ce86c7SWei Liu int err = 0; 284660ce86c7SWei Liu gid_t gid; 284760ce86c7SWei Liu size_t offset = 7; 284860ce86c7SWei Liu 284960ce86c7SWei Liu v9fs_string_init(&name); 285060ce86c7SWei Liu v9fs_string_init(&symname); 285160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 285260ce86c7SWei Liu if (err < 0) { 285360ce86c7SWei Liu goto out_nofid; 285460ce86c7SWei Liu } 285560ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 285660ce86c7SWei Liu 2857fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2858fff39a7aSGreg Kurz err = -ENOENT; 2859fff39a7aSGreg Kurz goto out_nofid; 2860fff39a7aSGreg Kurz } 2861fff39a7aSGreg Kurz 2862805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2863805b5d98SGreg Kurz err = -EEXIST; 2864805b5d98SGreg Kurz goto out_nofid; 2865805b5d98SGreg Kurz } 2866805b5d98SGreg Kurz 286760ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 286860ce86c7SWei Liu if (dfidp == NULL) { 286960ce86c7SWei Liu err = -EINVAL; 287060ce86c7SWei Liu goto out_nofid; 287160ce86c7SWei Liu } 287260ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 287360ce86c7SWei Liu if (err < 0) { 287460ce86c7SWei Liu goto out; 287560ce86c7SWei Liu } 28763b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28773b5ee9e8SAntonios Motakis if (err < 0) { 28783b5ee9e8SAntonios Motakis goto out; 28793b5ee9e8SAntonios Motakis } 288060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 288160ce86c7SWei Liu if (err < 0) { 288260ce86c7SWei Liu goto out; 288360ce86c7SWei Liu } 288460ce86c7SWei Liu err += offset; 288560ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 288660ce86c7SWei Liu qid.type, qid.version, qid.path); 288760ce86c7SWei Liu out: 288860ce86c7SWei Liu put_fid(pdu, dfidp); 288960ce86c7SWei Liu out_nofid: 289060ce86c7SWei Liu pdu_complete(pdu, err); 289160ce86c7SWei Liu v9fs_string_free(&name); 289260ce86c7SWei Liu v9fs_string_free(&symname); 289360ce86c7SWei Liu } 289460ce86c7SWei Liu 2895a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 289660ce86c7SWei Liu { 289760ce86c7SWei Liu ssize_t err; 289860ce86c7SWei Liu int16_t tag; 289960ce86c7SWei Liu size_t offset = 7; 2900d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 290160ce86c7SWei Liu V9fsPDU *pdu = opaque; 290260ce86c7SWei Liu V9fsState *s = pdu->s; 290360ce86c7SWei Liu 290460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 290560ce86c7SWei Liu if (err < 0) { 290660ce86c7SWei Liu pdu_complete(pdu, err); 290760ce86c7SWei Liu return; 290860ce86c7SWei Liu } 290960ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 291060ce86c7SWei Liu 2911d5f2af7bSGreg Kurz if (pdu->tag == tag) { 29123dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2913d5f2af7bSGreg Kurz } else { 291460ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 291560ce86c7SWei Liu if (cancel_pdu->tag == tag) { 291660ce86c7SWei Liu break; 291760ce86c7SWei Liu } 291860ce86c7SWei Liu } 2919d5f2af7bSGreg Kurz } 292060ce86c7SWei Liu if (cancel_pdu) { 292160ce86c7SWei Liu cancel_pdu->cancelled = 1; 292260ce86c7SWei Liu /* 292360ce86c7SWei Liu * Wait for pdu to complete. 292460ce86c7SWei Liu */ 29251ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 292618adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 292760ce86c7SWei Liu cancel_pdu->cancelled = 0; 292860ce86c7SWei Liu pdu_free(cancel_pdu); 292960ce86c7SWei Liu } 293018adde86SGreg Kurz } 293160ce86c7SWei Liu pdu_complete(pdu, 7); 293260ce86c7SWei Liu } 293360ce86c7SWei Liu 29348440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 293560ce86c7SWei Liu { 293660ce86c7SWei Liu V9fsPDU *pdu = opaque; 293760ce86c7SWei Liu int32_t dfid, oldfid; 293860ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 293960ce86c7SWei Liu V9fsString name; 294060ce86c7SWei Liu size_t offset = 7; 294160ce86c7SWei Liu int err = 0; 294260ce86c7SWei Liu 294360ce86c7SWei Liu v9fs_string_init(&name); 294460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 294560ce86c7SWei Liu if (err < 0) { 294660ce86c7SWei Liu goto out_nofid; 294760ce86c7SWei Liu } 294860ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 294960ce86c7SWei Liu 2950fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2951fff39a7aSGreg Kurz err = -ENOENT; 2952fff39a7aSGreg Kurz goto out_nofid; 2953fff39a7aSGreg Kurz } 2954fff39a7aSGreg Kurz 2955805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2956805b5d98SGreg Kurz err = -EEXIST; 2957805b5d98SGreg Kurz goto out_nofid; 2958805b5d98SGreg Kurz } 2959805b5d98SGreg Kurz 296060ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 296160ce86c7SWei Liu if (dfidp == NULL) { 296260ce86c7SWei Liu err = -ENOENT; 296360ce86c7SWei Liu goto out_nofid; 296460ce86c7SWei Liu } 296560ce86c7SWei Liu 296660ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 296760ce86c7SWei Liu if (oldfidp == NULL) { 296860ce86c7SWei Liu err = -ENOENT; 296960ce86c7SWei Liu goto out; 297060ce86c7SWei Liu } 297160ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 297260ce86c7SWei Liu if (!err) { 297360ce86c7SWei Liu err = offset; 297460ce86c7SWei Liu } 29754c158678SLi Qiang put_fid(pdu, oldfidp); 297660ce86c7SWei Liu out: 297760ce86c7SWei Liu put_fid(pdu, dfidp); 297860ce86c7SWei Liu out_nofid: 297960ce86c7SWei Liu v9fs_string_free(&name); 298060ce86c7SWei Liu pdu_complete(pdu, err); 298160ce86c7SWei Liu } 298260ce86c7SWei Liu 298360ce86c7SWei Liu /* Only works with path name based fid */ 29848440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 298560ce86c7SWei Liu { 298660ce86c7SWei Liu int32_t fid; 298760ce86c7SWei Liu int err = 0; 298860ce86c7SWei Liu size_t offset = 7; 298960ce86c7SWei Liu V9fsFidState *fidp; 299060ce86c7SWei Liu V9fsPDU *pdu = opaque; 299160ce86c7SWei Liu 299260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 299360ce86c7SWei Liu if (err < 0) { 299460ce86c7SWei Liu goto out_nofid; 299560ce86c7SWei Liu } 299660ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 299760ce86c7SWei Liu 299860ce86c7SWei Liu fidp = get_fid(pdu, fid); 299960ce86c7SWei Liu if (fidp == NULL) { 300060ce86c7SWei Liu err = -EINVAL; 300160ce86c7SWei Liu goto out_nofid; 300260ce86c7SWei Liu } 300360ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 300460ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 300560ce86c7SWei Liu err = -EOPNOTSUPP; 300660ce86c7SWei Liu goto out_err; 300760ce86c7SWei Liu } 300860ce86c7SWei Liu /* 300960ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 301060ce86c7SWei Liu * the file later. So don't reclaim fd 301160ce86c7SWei Liu */ 301260ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 301360ce86c7SWei Liu if (err < 0) { 301460ce86c7SWei Liu goto out_err; 301560ce86c7SWei Liu } 301660ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 301760ce86c7SWei Liu if (!err) { 301860ce86c7SWei Liu err = offset; 301960ce86c7SWei Liu } 302060ce86c7SWei Liu out_err: 302160ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 302260ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 302360ce86c7SWei Liu put_fid(pdu, fidp); 302460ce86c7SWei Liu out_nofid: 302560ce86c7SWei Liu pdu_complete(pdu, err); 302660ce86c7SWei Liu } 302760ce86c7SWei Liu 30288440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 302960ce86c7SWei Liu { 303060ce86c7SWei Liu int err = 0; 303160ce86c7SWei Liu V9fsString name; 303267e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 303360ce86c7SWei Liu size_t offset = 7; 303460ce86c7SWei Liu V9fsPath path; 303560ce86c7SWei Liu V9fsFidState *dfidp; 303660ce86c7SWei Liu V9fsPDU *pdu = opaque; 303760ce86c7SWei Liu 303860ce86c7SWei Liu v9fs_string_init(&name); 303960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 304060ce86c7SWei Liu if (err < 0) { 304160ce86c7SWei Liu goto out_nofid; 304260ce86c7SWei Liu } 3043fff39a7aSGreg Kurz 3044fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3045fff39a7aSGreg Kurz err = -ENOENT; 3046fff39a7aSGreg Kurz goto out_nofid; 3047fff39a7aSGreg Kurz } 3048fff39a7aSGreg Kurz 3049805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3050805b5d98SGreg Kurz err = -EINVAL; 3051805b5d98SGreg Kurz goto out_nofid; 3052805b5d98SGreg Kurz } 3053805b5d98SGreg Kurz 3054805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3055805b5d98SGreg Kurz err = -ENOTEMPTY; 3056805b5d98SGreg Kurz goto out_nofid; 3057805b5d98SGreg Kurz } 3058805b5d98SGreg Kurz 305967e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 306067e87345SKeno Fischer err = -EINVAL; 306167e87345SKeno Fischer goto out_nofid; 306267e87345SKeno Fischer } 306367e87345SKeno Fischer 306467e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 306567e87345SKeno Fischer rflags |= AT_REMOVEDIR; 306667e87345SKeno Fischer } 306767e87345SKeno Fischer 306860ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 306960ce86c7SWei Liu if (dfidp == NULL) { 307060ce86c7SWei Liu err = -EINVAL; 307160ce86c7SWei Liu goto out_nofid; 307260ce86c7SWei Liu } 307360ce86c7SWei Liu /* 307460ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 307560ce86c7SWei Liu * the file later. So don't reclaim fd 307660ce86c7SWei Liu */ 307760ce86c7SWei Liu v9fs_path_init(&path); 307860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 307960ce86c7SWei Liu if (err < 0) { 308060ce86c7SWei Liu goto out_err; 308160ce86c7SWei Liu } 308260ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 308360ce86c7SWei Liu if (err < 0) { 308460ce86c7SWei Liu goto out_err; 308560ce86c7SWei Liu } 308667e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 308760ce86c7SWei Liu if (!err) { 308860ce86c7SWei Liu err = offset; 308960ce86c7SWei Liu } 309060ce86c7SWei Liu out_err: 309160ce86c7SWei Liu put_fid(pdu, dfidp); 309260ce86c7SWei Liu v9fs_path_free(&path); 309360ce86c7SWei Liu out_nofid: 309460ce86c7SWei Liu pdu_complete(pdu, err); 309560ce86c7SWei Liu v9fs_string_free(&name); 309660ce86c7SWei Liu } 309760ce86c7SWei Liu 309860ce86c7SWei Liu 309960ce86c7SWei Liu /* Only works with path name based fid */ 31008440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 31018440e22eSGreg Kurz int32_t newdirfid, 31028440e22eSGreg Kurz V9fsString *name) 310360ce86c7SWei Liu { 310460ce86c7SWei Liu int err = 0; 310560ce86c7SWei Liu V9fsPath new_path; 310660ce86c7SWei Liu V9fsFidState *tfidp; 310760ce86c7SWei Liu V9fsState *s = pdu->s; 310860ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 310960ce86c7SWei Liu 311060ce86c7SWei Liu v9fs_path_init(&new_path); 311160ce86c7SWei Liu if (newdirfid != -1) { 311260ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 311360ce86c7SWei Liu if (dirfidp == NULL) { 3114b858e80aSDaniel Henrique Barboza return -ENOENT; 311560ce86c7SWei Liu } 311649dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 311749dd946bSGreg Kurz err = -EINVAL; 311849dd946bSGreg Kurz goto out; 311949dd946bSGreg Kurz } 31204fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 31214fa62005SGreg Kurz if (err < 0) { 31224fa62005SGreg Kurz goto out; 31234fa62005SGreg Kurz } 312460ce86c7SWei Liu } else { 31254d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31264d8bc733SJan Dakinevich V9fsPath dir_path; 31274d8bc733SJan Dakinevich 31284d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31294d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31304d8bc733SJan Dakinevich g_free(dir_name); 31314d8bc733SJan Dakinevich 31324d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31334d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31344fa62005SGreg Kurz if (err < 0) { 31354fa62005SGreg Kurz goto out; 31364fa62005SGreg Kurz } 313760ce86c7SWei Liu } 313860ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 313960ce86c7SWei Liu if (err < 0) { 314060ce86c7SWei Liu goto out; 314160ce86c7SWei Liu } 314260ce86c7SWei Liu /* 314360ce86c7SWei Liu * Fixup fid's pointing to the old name to 314460ce86c7SWei Liu * start pointing to the new name 314560ce86c7SWei Liu */ 3146feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 314760ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 314860ce86c7SWei Liu /* replace the name */ 314960ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 315060ce86c7SWei Liu } 315160ce86c7SWei Liu } 315260ce86c7SWei Liu out: 315360ce86c7SWei Liu if (dirfidp) { 315460ce86c7SWei Liu put_fid(pdu, dirfidp); 315560ce86c7SWei Liu } 315660ce86c7SWei Liu v9fs_path_free(&new_path); 315760ce86c7SWei Liu return err; 315860ce86c7SWei Liu } 315960ce86c7SWei Liu 316060ce86c7SWei Liu /* Only works with path name based fid */ 31618440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 316260ce86c7SWei Liu { 316360ce86c7SWei Liu int32_t fid; 316460ce86c7SWei Liu ssize_t err = 0; 316560ce86c7SWei Liu size_t offset = 7; 316660ce86c7SWei Liu V9fsString name; 316760ce86c7SWei Liu int32_t newdirfid; 316860ce86c7SWei Liu V9fsFidState *fidp; 316960ce86c7SWei Liu V9fsPDU *pdu = opaque; 317060ce86c7SWei Liu V9fsState *s = pdu->s; 317160ce86c7SWei Liu 317260ce86c7SWei Liu v9fs_string_init(&name); 317360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 317460ce86c7SWei Liu if (err < 0) { 317560ce86c7SWei Liu goto out_nofid; 317660ce86c7SWei Liu } 3177fff39a7aSGreg Kurz 3178fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3179fff39a7aSGreg Kurz err = -ENOENT; 3180fff39a7aSGreg Kurz goto out_nofid; 3181fff39a7aSGreg Kurz } 3182fff39a7aSGreg Kurz 3183805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3184805b5d98SGreg Kurz err = -EISDIR; 3185805b5d98SGreg Kurz goto out_nofid; 3186805b5d98SGreg Kurz } 3187805b5d98SGreg Kurz 318860ce86c7SWei Liu fidp = get_fid(pdu, fid); 318960ce86c7SWei Liu if (fidp == NULL) { 319060ce86c7SWei Liu err = -ENOENT; 319160ce86c7SWei Liu goto out_nofid; 319260ce86c7SWei Liu } 319349dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 319449dd946bSGreg Kurz err = -EINVAL; 319549dd946bSGreg Kurz goto out; 319649dd946bSGreg Kurz } 319760ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 319860ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 319960ce86c7SWei Liu err = -EOPNOTSUPP; 320060ce86c7SWei Liu goto out; 320160ce86c7SWei Liu } 320260ce86c7SWei Liu v9fs_path_write_lock(s); 320360ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 320460ce86c7SWei Liu v9fs_path_unlock(s); 320560ce86c7SWei Liu if (!err) { 320660ce86c7SWei Liu err = offset; 320760ce86c7SWei Liu } 320860ce86c7SWei Liu out: 320960ce86c7SWei Liu put_fid(pdu, fidp); 321060ce86c7SWei Liu out_nofid: 321160ce86c7SWei Liu pdu_complete(pdu, err); 321260ce86c7SWei Liu v9fs_string_free(&name); 321360ce86c7SWei Liu } 321460ce86c7SWei Liu 32154fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 32168440e22eSGreg Kurz V9fsString *old_name, 32178440e22eSGreg Kurz V9fsPath *newdir, 321860ce86c7SWei Liu V9fsString *new_name) 321960ce86c7SWei Liu { 322060ce86c7SWei Liu V9fsFidState *tfidp; 322160ce86c7SWei Liu V9fsPath oldpath, newpath; 322260ce86c7SWei Liu V9fsState *s = pdu->s; 32234fa62005SGreg Kurz int err; 322460ce86c7SWei Liu 322560ce86c7SWei Liu v9fs_path_init(&oldpath); 322660ce86c7SWei Liu v9fs_path_init(&newpath); 32274fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32284fa62005SGreg Kurz if (err < 0) { 32294fa62005SGreg Kurz goto out; 32304fa62005SGreg Kurz } 32314fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32324fa62005SGreg Kurz if (err < 0) { 32334fa62005SGreg Kurz goto out; 32344fa62005SGreg Kurz } 323560ce86c7SWei Liu 323660ce86c7SWei Liu /* 323760ce86c7SWei Liu * Fixup fid's pointing to the old name to 323860ce86c7SWei Liu * start pointing to the new name 323960ce86c7SWei Liu */ 3240feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 324160ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 324260ce86c7SWei Liu /* replace the name */ 324360ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 324460ce86c7SWei Liu } 324560ce86c7SWei Liu } 32464fa62005SGreg Kurz out: 324760ce86c7SWei Liu v9fs_path_free(&oldpath); 324860ce86c7SWei Liu v9fs_path_free(&newpath); 32494fa62005SGreg Kurz return err; 325060ce86c7SWei Liu } 325160ce86c7SWei Liu 32528440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 32538440e22eSGreg Kurz V9fsString *old_name, 32548440e22eSGreg Kurz int32_t newdirfid, 325560ce86c7SWei Liu V9fsString *new_name) 325660ce86c7SWei Liu { 325760ce86c7SWei Liu int err = 0; 325860ce86c7SWei Liu V9fsState *s = pdu->s; 325960ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 326060ce86c7SWei Liu 326160ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 326260ce86c7SWei Liu if (olddirfidp == NULL) { 326360ce86c7SWei Liu err = -ENOENT; 326460ce86c7SWei Liu goto out; 326560ce86c7SWei Liu } 326660ce86c7SWei Liu if (newdirfid != -1) { 326760ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 326860ce86c7SWei Liu if (newdirfidp == NULL) { 326960ce86c7SWei Liu err = -ENOENT; 327060ce86c7SWei Liu goto out; 327160ce86c7SWei Liu } 327260ce86c7SWei Liu } else { 327360ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 327460ce86c7SWei Liu } 327560ce86c7SWei Liu 327660ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 327760ce86c7SWei Liu &newdirfidp->path, new_name); 327860ce86c7SWei Liu if (err < 0) { 327960ce86c7SWei Liu goto out; 328060ce86c7SWei Liu } 328160ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 328260ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 32834fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 328460ce86c7SWei Liu &newdirfidp->path, new_name); 328560ce86c7SWei Liu } 328660ce86c7SWei Liu out: 328760ce86c7SWei Liu if (olddirfidp) { 328860ce86c7SWei Liu put_fid(pdu, olddirfidp); 328960ce86c7SWei Liu } 329060ce86c7SWei Liu if (newdirfidp) { 329160ce86c7SWei Liu put_fid(pdu, newdirfidp); 329260ce86c7SWei Liu } 329360ce86c7SWei Liu return err; 329460ce86c7SWei Liu } 329560ce86c7SWei Liu 32968440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 329760ce86c7SWei Liu { 329860ce86c7SWei Liu ssize_t err = 0; 329960ce86c7SWei Liu size_t offset = 7; 330060ce86c7SWei Liu V9fsPDU *pdu = opaque; 330160ce86c7SWei Liu V9fsState *s = pdu->s; 330260ce86c7SWei Liu int32_t olddirfid, newdirfid; 330360ce86c7SWei Liu V9fsString old_name, new_name; 330460ce86c7SWei Liu 330560ce86c7SWei Liu v9fs_string_init(&old_name); 330660ce86c7SWei Liu v9fs_string_init(&new_name); 330760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 330860ce86c7SWei Liu &old_name, &newdirfid, &new_name); 330960ce86c7SWei Liu if (err < 0) { 331060ce86c7SWei Liu goto out_err; 331160ce86c7SWei Liu } 331260ce86c7SWei Liu 3313fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3314fff39a7aSGreg Kurz err = -ENOENT; 3315fff39a7aSGreg Kurz goto out_err; 3316fff39a7aSGreg Kurz } 3317fff39a7aSGreg Kurz 3318805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3319805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3320805b5d98SGreg Kurz err = -EISDIR; 3321805b5d98SGreg Kurz goto out_err; 3322805b5d98SGreg Kurz } 3323805b5d98SGreg Kurz 332460ce86c7SWei Liu v9fs_path_write_lock(s); 332560ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 332660ce86c7SWei Liu &old_name, newdirfid, &new_name); 332760ce86c7SWei Liu v9fs_path_unlock(s); 332860ce86c7SWei Liu if (!err) { 332960ce86c7SWei Liu err = offset; 333060ce86c7SWei Liu } 333160ce86c7SWei Liu 333260ce86c7SWei Liu out_err: 333360ce86c7SWei Liu pdu_complete(pdu, err); 333460ce86c7SWei Liu v9fs_string_free(&old_name); 333560ce86c7SWei Liu v9fs_string_free(&new_name); 333660ce86c7SWei Liu } 333760ce86c7SWei Liu 33388440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 333960ce86c7SWei Liu { 334060ce86c7SWei Liu int32_t fid; 334160ce86c7SWei Liu int err = 0; 334260ce86c7SWei Liu int16_t unused; 334360ce86c7SWei Liu V9fsStat v9stat; 334460ce86c7SWei Liu size_t offset = 7; 334560ce86c7SWei Liu struct stat stbuf; 334660ce86c7SWei Liu V9fsFidState *fidp; 334760ce86c7SWei Liu V9fsPDU *pdu = opaque; 33481d203986SGreg Kurz V9fsState *s = pdu->s; 334960ce86c7SWei Liu 335060ce86c7SWei Liu v9fs_stat_init(&v9stat); 335160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 335260ce86c7SWei Liu if (err < 0) { 335360ce86c7SWei Liu goto out_nofid; 335460ce86c7SWei Liu } 335560ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 335660ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 335760ce86c7SWei Liu 335860ce86c7SWei Liu fidp = get_fid(pdu, fid); 335960ce86c7SWei Liu if (fidp == NULL) { 336060ce86c7SWei Liu err = -EINVAL; 336160ce86c7SWei Liu goto out_nofid; 336260ce86c7SWei Liu } 336360ce86c7SWei Liu /* do we need to sync the file? */ 336460ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 336560ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 336660ce86c7SWei Liu goto out; 336760ce86c7SWei Liu } 336860ce86c7SWei Liu if (v9stat.mode != -1) { 336960ce86c7SWei Liu uint32_t v9_mode; 337060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 337160ce86c7SWei Liu if (err < 0) { 337260ce86c7SWei Liu goto out; 337360ce86c7SWei Liu } 337460ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 337560ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 337660ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 337760ce86c7SWei Liu /* Attempting to change the type */ 337860ce86c7SWei Liu err = -EIO; 337960ce86c7SWei Liu goto out; 338060ce86c7SWei Liu } 338160ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 338260ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 338360ce86c7SWei Liu &v9stat.extension)); 338460ce86c7SWei Liu if (err < 0) { 338560ce86c7SWei Liu goto out; 338660ce86c7SWei Liu } 338760ce86c7SWei Liu } 338860ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 338960ce86c7SWei Liu struct timespec times[2]; 339060ce86c7SWei Liu if (v9stat.atime != -1) { 339160ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 339260ce86c7SWei Liu times[0].tv_nsec = 0; 339360ce86c7SWei Liu } else { 339460ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 339560ce86c7SWei Liu } 339660ce86c7SWei Liu if (v9stat.mtime != -1) { 339760ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 339860ce86c7SWei Liu times[1].tv_nsec = 0; 339960ce86c7SWei Liu } else { 340060ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 340160ce86c7SWei Liu } 340260ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 340360ce86c7SWei Liu if (err < 0) { 340460ce86c7SWei Liu goto out; 340560ce86c7SWei Liu } 340660ce86c7SWei Liu } 340760ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 340860ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 340960ce86c7SWei Liu if (err < 0) { 341060ce86c7SWei Liu goto out; 341160ce86c7SWei Liu } 341260ce86c7SWei Liu } 341360ce86c7SWei Liu if (v9stat.name.size != 0) { 34141d203986SGreg Kurz v9fs_path_write_lock(s); 341560ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 34161d203986SGreg Kurz v9fs_path_unlock(s); 341760ce86c7SWei Liu if (err < 0) { 341860ce86c7SWei Liu goto out; 341960ce86c7SWei Liu } 342060ce86c7SWei Liu } 342160ce86c7SWei Liu if (v9stat.length != -1) { 342260ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 342360ce86c7SWei Liu if (err < 0) { 342460ce86c7SWei Liu goto out; 342560ce86c7SWei Liu } 342660ce86c7SWei Liu } 342760ce86c7SWei Liu err = offset; 342860ce86c7SWei Liu out: 342960ce86c7SWei Liu put_fid(pdu, fidp); 343060ce86c7SWei Liu out_nofid: 343160ce86c7SWei Liu v9fs_stat_free(&v9stat); 343260ce86c7SWei Liu pdu_complete(pdu, err); 343360ce86c7SWei Liu } 343460ce86c7SWei Liu 343560ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 343660ce86c7SWei Liu { 343760ce86c7SWei Liu uint32_t f_type; 343860ce86c7SWei Liu uint32_t f_bsize; 343960ce86c7SWei Liu uint64_t f_blocks; 344060ce86c7SWei Liu uint64_t f_bfree; 344160ce86c7SWei Liu uint64_t f_bavail; 344260ce86c7SWei Liu uint64_t f_files; 344360ce86c7SWei Liu uint64_t f_ffree; 344460ce86c7SWei Liu uint64_t fsid_val; 344560ce86c7SWei Liu uint32_t f_namelen; 344660ce86c7SWei Liu size_t offset = 7; 344760ce86c7SWei Liu int32_t bsize_factor; 344860ce86c7SWei Liu 344960ce86c7SWei Liu /* 345060ce86c7SWei Liu * compute bsize factor based on host file system block size 345160ce86c7SWei Liu * and client msize 345260ce86c7SWei Liu */ 345360ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 345460ce86c7SWei Liu if (!bsize_factor) { 345560ce86c7SWei Liu bsize_factor = 1; 345660ce86c7SWei Liu } 345760ce86c7SWei Liu f_type = stbuf->f_type; 345860ce86c7SWei Liu f_bsize = stbuf->f_bsize; 345960ce86c7SWei Liu f_bsize *= bsize_factor; 346060ce86c7SWei Liu /* 346160ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 346260ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 346360ce86c7SWei Liu * blocks by bsize factor 346460ce86c7SWei Liu */ 346560ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 346660ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 346760ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 346860ce86c7SWei Liu f_files = stbuf->f_files; 346960ce86c7SWei Liu f_ffree = stbuf->f_ffree; 347060ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 347160ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 347260ce86c7SWei Liu f_namelen = stbuf->f_namelen; 347360ce86c7SWei Liu 347460ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 347560ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 347660ce86c7SWei Liu f_bavail, f_files, f_ffree, 347760ce86c7SWei Liu fsid_val, f_namelen); 347860ce86c7SWei Liu } 347960ce86c7SWei Liu 34808440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 348160ce86c7SWei Liu { 348260ce86c7SWei Liu int32_t fid; 348360ce86c7SWei Liu ssize_t retval = 0; 348460ce86c7SWei Liu size_t offset = 7; 348560ce86c7SWei Liu V9fsFidState *fidp; 348660ce86c7SWei Liu struct statfs stbuf; 348760ce86c7SWei Liu V9fsPDU *pdu = opaque; 348860ce86c7SWei Liu V9fsState *s = pdu->s; 348960ce86c7SWei Liu 349060ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 349160ce86c7SWei Liu if (retval < 0) { 349260ce86c7SWei Liu goto out_nofid; 349360ce86c7SWei Liu } 349460ce86c7SWei Liu fidp = get_fid(pdu, fid); 349560ce86c7SWei Liu if (fidp == NULL) { 349660ce86c7SWei Liu retval = -ENOENT; 349760ce86c7SWei Liu goto out_nofid; 349860ce86c7SWei Liu } 349960ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 350060ce86c7SWei Liu if (retval < 0) { 350160ce86c7SWei Liu goto out; 350260ce86c7SWei Liu } 350360ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 350460ce86c7SWei Liu if (retval < 0) { 350560ce86c7SWei Liu goto out; 350660ce86c7SWei Liu } 350760ce86c7SWei Liu retval += offset; 350860ce86c7SWei Liu out: 350960ce86c7SWei Liu put_fid(pdu, fidp); 351060ce86c7SWei Liu out_nofid: 351160ce86c7SWei Liu pdu_complete(pdu, retval); 351260ce86c7SWei Liu } 351360ce86c7SWei Liu 35148440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 351560ce86c7SWei Liu { 351660ce86c7SWei Liu 351760ce86c7SWei Liu int mode; 351860ce86c7SWei Liu gid_t gid; 351960ce86c7SWei Liu int32_t fid; 352060ce86c7SWei Liu V9fsQID qid; 352160ce86c7SWei Liu int err = 0; 352260ce86c7SWei Liu int major, minor; 352360ce86c7SWei Liu size_t offset = 7; 352460ce86c7SWei Liu V9fsString name; 352560ce86c7SWei Liu struct stat stbuf; 352660ce86c7SWei Liu V9fsFidState *fidp; 352760ce86c7SWei Liu V9fsPDU *pdu = opaque; 352860ce86c7SWei Liu 352960ce86c7SWei Liu v9fs_string_init(&name); 353060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 353160ce86c7SWei Liu &major, &minor, &gid); 353260ce86c7SWei Liu if (err < 0) { 353360ce86c7SWei Liu goto out_nofid; 353460ce86c7SWei Liu } 353560ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 353660ce86c7SWei Liu 3537fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3538fff39a7aSGreg Kurz err = -ENOENT; 3539fff39a7aSGreg Kurz goto out_nofid; 3540fff39a7aSGreg Kurz } 3541fff39a7aSGreg Kurz 3542805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3543805b5d98SGreg Kurz err = -EEXIST; 3544805b5d98SGreg Kurz goto out_nofid; 3545805b5d98SGreg Kurz } 3546805b5d98SGreg Kurz 354760ce86c7SWei Liu fidp = get_fid(pdu, fid); 354860ce86c7SWei Liu if (fidp == NULL) { 354960ce86c7SWei Liu err = -ENOENT; 355060ce86c7SWei Liu goto out_nofid; 355160ce86c7SWei Liu } 355260ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 355360ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 355460ce86c7SWei Liu if (err < 0) { 355560ce86c7SWei Liu goto out; 355660ce86c7SWei Liu } 35573b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 35583b5ee9e8SAntonios Motakis if (err < 0) { 35593b5ee9e8SAntonios Motakis goto out; 35603b5ee9e8SAntonios Motakis } 356160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 356260ce86c7SWei Liu if (err < 0) { 356360ce86c7SWei Liu goto out; 356460ce86c7SWei Liu } 356560ce86c7SWei Liu err += offset; 356660ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 356760ce86c7SWei Liu qid.type, qid.version, qid.path); 356860ce86c7SWei Liu out: 356960ce86c7SWei Liu put_fid(pdu, fidp); 357060ce86c7SWei Liu out_nofid: 357160ce86c7SWei Liu pdu_complete(pdu, err); 357260ce86c7SWei Liu v9fs_string_free(&name); 357360ce86c7SWei Liu } 357460ce86c7SWei Liu 357560ce86c7SWei Liu /* 357660ce86c7SWei Liu * Implement posix byte range locking code 357760ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 357860ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 357960ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 358060ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 358160ce86c7SWei Liu * So when a TLOCK request comes, always return success 358260ce86c7SWei Liu */ 35838440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 358460ce86c7SWei Liu { 358560ce86c7SWei Liu V9fsFlock flock; 358660ce86c7SWei Liu size_t offset = 7; 358760ce86c7SWei Liu struct stat stbuf; 358860ce86c7SWei Liu V9fsFidState *fidp; 358960ce86c7SWei Liu int32_t fid, err = 0; 359060ce86c7SWei Liu V9fsPDU *pdu = opaque; 359160ce86c7SWei Liu 359260ce86c7SWei Liu v9fs_string_init(&flock.client_id); 359360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 359460ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 359560ce86c7SWei Liu &flock.proc_id, &flock.client_id); 359660ce86c7SWei Liu if (err < 0) { 359760ce86c7SWei Liu goto out_nofid; 359860ce86c7SWei Liu } 359960ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 360060ce86c7SWei Liu flock.type, flock.start, flock.length); 360160ce86c7SWei Liu 360260ce86c7SWei Liu 360360ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 360460ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 360560ce86c7SWei Liu err = -EINVAL; 360660ce86c7SWei Liu goto out_nofid; 360760ce86c7SWei Liu } 360860ce86c7SWei Liu fidp = get_fid(pdu, fid); 360960ce86c7SWei Liu if (fidp == NULL) { 361060ce86c7SWei Liu err = -ENOENT; 361160ce86c7SWei Liu goto out_nofid; 361260ce86c7SWei Liu } 361360ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 361460ce86c7SWei Liu if (err < 0) { 361560ce86c7SWei Liu goto out; 361660ce86c7SWei Liu } 36174bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 36184bae2b39SPaolo Bonzini if (err < 0) { 36194bae2b39SPaolo Bonzini goto out; 36204bae2b39SPaolo Bonzini } 36214bae2b39SPaolo Bonzini err += offset; 36224bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 362360ce86c7SWei Liu out: 362460ce86c7SWei Liu put_fid(pdu, fidp); 362560ce86c7SWei Liu out_nofid: 362660ce86c7SWei Liu pdu_complete(pdu, err); 362760ce86c7SWei Liu v9fs_string_free(&flock.client_id); 362860ce86c7SWei Liu } 362960ce86c7SWei Liu 363060ce86c7SWei Liu /* 363160ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 363260ce86c7SWei Liu * handling is done by client's VFS layer. 363360ce86c7SWei Liu */ 36348440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 363560ce86c7SWei Liu { 363660ce86c7SWei Liu size_t offset = 7; 363760ce86c7SWei Liu struct stat stbuf; 363860ce86c7SWei Liu V9fsFidState *fidp; 363960ce86c7SWei Liu V9fsGetlock glock; 364060ce86c7SWei Liu int32_t fid, err = 0; 364160ce86c7SWei Liu V9fsPDU *pdu = opaque; 364260ce86c7SWei Liu 364360ce86c7SWei Liu v9fs_string_init(&glock.client_id); 364460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 364560ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 364660ce86c7SWei Liu &glock.client_id); 364760ce86c7SWei Liu if (err < 0) { 364860ce86c7SWei Liu goto out_nofid; 364960ce86c7SWei Liu } 365060ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 365160ce86c7SWei Liu glock.type, glock.start, glock.length); 365260ce86c7SWei Liu 365360ce86c7SWei Liu fidp = get_fid(pdu, fid); 365460ce86c7SWei Liu if (fidp == NULL) { 365560ce86c7SWei Liu err = -ENOENT; 365660ce86c7SWei Liu goto out_nofid; 365760ce86c7SWei Liu } 365860ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 365960ce86c7SWei Liu if (err < 0) { 366060ce86c7SWei Liu goto out; 366160ce86c7SWei Liu } 366260ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 366360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 366460ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 366560ce86c7SWei Liu &glock.client_id); 366660ce86c7SWei Liu if (err < 0) { 366760ce86c7SWei Liu goto out; 366860ce86c7SWei Liu } 366960ce86c7SWei Liu err += offset; 367060ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 367160ce86c7SWei Liu glock.length, glock.proc_id); 367260ce86c7SWei Liu out: 367360ce86c7SWei Liu put_fid(pdu, fidp); 367460ce86c7SWei Liu out_nofid: 367560ce86c7SWei Liu pdu_complete(pdu, err); 367660ce86c7SWei Liu v9fs_string_free(&glock.client_id); 367760ce86c7SWei Liu } 367860ce86c7SWei Liu 36798440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 368060ce86c7SWei Liu { 368160ce86c7SWei Liu V9fsPDU *pdu = opaque; 368260ce86c7SWei Liu size_t offset = 7; 368360ce86c7SWei Liu int32_t fid; 368460ce86c7SWei Liu struct stat stbuf; 368560ce86c7SWei Liu V9fsQID qid; 368660ce86c7SWei Liu V9fsString name; 368760ce86c7SWei Liu V9fsFidState *fidp; 368860ce86c7SWei Liu gid_t gid; 368960ce86c7SWei Liu int mode; 369060ce86c7SWei Liu int err = 0; 369160ce86c7SWei Liu 369260ce86c7SWei Liu v9fs_string_init(&name); 369360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 369460ce86c7SWei Liu if (err < 0) { 369560ce86c7SWei Liu goto out_nofid; 369660ce86c7SWei Liu } 369760ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 369860ce86c7SWei Liu 3699fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3700fff39a7aSGreg Kurz err = -ENOENT; 3701fff39a7aSGreg Kurz goto out_nofid; 3702fff39a7aSGreg Kurz } 3703fff39a7aSGreg Kurz 3704805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3705805b5d98SGreg Kurz err = -EEXIST; 3706805b5d98SGreg Kurz goto out_nofid; 3707805b5d98SGreg Kurz } 3708805b5d98SGreg Kurz 370960ce86c7SWei Liu fidp = get_fid(pdu, fid); 371060ce86c7SWei Liu if (fidp == NULL) { 371160ce86c7SWei Liu err = -ENOENT; 371260ce86c7SWei Liu goto out_nofid; 371360ce86c7SWei Liu } 371460ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 371560ce86c7SWei Liu if (err < 0) { 371660ce86c7SWei Liu goto out; 371760ce86c7SWei Liu } 37183b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 37193b5ee9e8SAntonios Motakis if (err < 0) { 37203b5ee9e8SAntonios Motakis goto out; 37213b5ee9e8SAntonios Motakis } 372260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 372360ce86c7SWei Liu if (err < 0) { 372460ce86c7SWei Liu goto out; 372560ce86c7SWei Liu } 372660ce86c7SWei Liu err += offset; 372760ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 372860ce86c7SWei Liu qid.type, qid.version, qid.path, err); 372960ce86c7SWei Liu out: 373060ce86c7SWei Liu put_fid(pdu, fidp); 373160ce86c7SWei Liu out_nofid: 373260ce86c7SWei Liu pdu_complete(pdu, err); 373360ce86c7SWei Liu v9fs_string_free(&name); 373460ce86c7SWei Liu } 373560ce86c7SWei Liu 37368440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 373760ce86c7SWei Liu { 373860ce86c7SWei Liu int64_t size; 373960ce86c7SWei Liu V9fsString name; 374060ce86c7SWei Liu ssize_t err = 0; 374160ce86c7SWei Liu size_t offset = 7; 374260ce86c7SWei Liu int32_t fid, newfid; 374360ce86c7SWei Liu V9fsFidState *file_fidp; 374460ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 374560ce86c7SWei Liu V9fsPDU *pdu = opaque; 374660ce86c7SWei Liu V9fsState *s = pdu->s; 374760ce86c7SWei Liu 374860ce86c7SWei Liu v9fs_string_init(&name); 374960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 375060ce86c7SWei Liu if (err < 0) { 375160ce86c7SWei Liu goto out_nofid; 375260ce86c7SWei Liu } 375360ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 375460ce86c7SWei Liu 375560ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 375660ce86c7SWei Liu if (file_fidp == NULL) { 375760ce86c7SWei Liu err = -ENOENT; 375860ce86c7SWei Liu goto out_nofid; 375960ce86c7SWei Liu } 376060ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 376160ce86c7SWei Liu if (xattr_fidp == NULL) { 376260ce86c7SWei Liu err = -EINVAL; 376360ce86c7SWei Liu goto out; 376460ce86c7SWei Liu } 376560ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3766ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 376760ce86c7SWei Liu /* 376860ce86c7SWei Liu * listxattr request. Get the size first 376960ce86c7SWei Liu */ 377060ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 377160ce86c7SWei Liu if (size < 0) { 377260ce86c7SWei Liu err = size; 377360ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 377460ce86c7SWei Liu goto out; 377560ce86c7SWei Liu } 377660ce86c7SWei Liu /* 377760ce86c7SWei Liu * Read the xattr value 377860ce86c7SWei Liu */ 377960ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 378060ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3781dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37827bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3783a647502cSKeno Fischer if (size) { 378460ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 378560ce86c7SWei Liu xattr_fidp->fs.xattr.value, 378660ce86c7SWei Liu xattr_fidp->fs.xattr.len); 378760ce86c7SWei Liu if (err < 0) { 378860ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 378960ce86c7SWei Liu goto out; 379060ce86c7SWei Liu } 379160ce86c7SWei Liu } 379260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 379360ce86c7SWei Liu if (err < 0) { 379460ce86c7SWei Liu goto out; 379560ce86c7SWei Liu } 379660ce86c7SWei Liu err += offset; 379760ce86c7SWei Liu } else { 379860ce86c7SWei Liu /* 379960ce86c7SWei Liu * specific xattr fid. We check for xattr 380060ce86c7SWei Liu * presence also collect the xattr size 380160ce86c7SWei Liu */ 380260ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 380360ce86c7SWei Liu &name, NULL, 0); 380460ce86c7SWei Liu if (size < 0) { 380560ce86c7SWei Liu err = size; 380660ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 380760ce86c7SWei Liu goto out; 380860ce86c7SWei Liu } 380960ce86c7SWei Liu /* 381060ce86c7SWei Liu * Read the xattr value 381160ce86c7SWei Liu */ 381260ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 381360ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3814dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38157bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3816a647502cSKeno Fischer if (size) { 381760ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 381860ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 381960ce86c7SWei Liu xattr_fidp->fs.xattr.len); 382060ce86c7SWei Liu if (err < 0) { 382160ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 382260ce86c7SWei Liu goto out; 382360ce86c7SWei Liu } 382460ce86c7SWei Liu } 382560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 382660ce86c7SWei Liu if (err < 0) { 382760ce86c7SWei Liu goto out; 382860ce86c7SWei Liu } 382960ce86c7SWei Liu err += offset; 383060ce86c7SWei Liu } 383160ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 383260ce86c7SWei Liu out: 383360ce86c7SWei Liu put_fid(pdu, file_fidp); 383460ce86c7SWei Liu if (xattr_fidp) { 383560ce86c7SWei Liu put_fid(pdu, xattr_fidp); 383660ce86c7SWei Liu } 383760ce86c7SWei Liu out_nofid: 383860ce86c7SWei Liu pdu_complete(pdu, err); 383960ce86c7SWei Liu v9fs_string_free(&name); 384060ce86c7SWei Liu } 384160ce86c7SWei Liu 38428440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 384360ce86c7SWei Liu { 3844aca6897fSKeno Fischer int flags, rflags = 0; 384560ce86c7SWei Liu int32_t fid; 38463b79ef2cSGreg Kurz uint64_t size; 384760ce86c7SWei Liu ssize_t err = 0; 384860ce86c7SWei Liu V9fsString name; 384960ce86c7SWei Liu size_t offset = 7; 385060ce86c7SWei Liu V9fsFidState *file_fidp; 385160ce86c7SWei Liu V9fsFidState *xattr_fidp; 385260ce86c7SWei Liu V9fsPDU *pdu = opaque; 385360ce86c7SWei Liu 385460ce86c7SWei Liu v9fs_string_init(&name); 385560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 385660ce86c7SWei Liu if (err < 0) { 385760ce86c7SWei Liu goto out_nofid; 385860ce86c7SWei Liu } 385960ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 386060ce86c7SWei Liu 3861aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3862aca6897fSKeno Fischer err = -EINVAL; 3863aca6897fSKeno Fischer goto out_nofid; 3864aca6897fSKeno Fischer } 3865aca6897fSKeno Fischer 3866aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3867aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3868aca6897fSKeno Fischer } 3869aca6897fSKeno Fischer 3870aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3871aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3872aca6897fSKeno Fischer } 3873aca6897fSKeno Fischer 38743b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 38753b79ef2cSGreg Kurz err = -E2BIG; 38763b79ef2cSGreg Kurz goto out_nofid; 38773b79ef2cSGreg Kurz } 38783b79ef2cSGreg Kurz 387960ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 388060ce86c7SWei Liu if (file_fidp == NULL) { 388160ce86c7SWei Liu err = -EINVAL; 388260ce86c7SWei Liu goto out_nofid; 388360ce86c7SWei Liu } 3884dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3885dd654e03SGreg Kurz err = -EINVAL; 3886dd654e03SGreg Kurz goto out_put_fid; 3887dd654e03SGreg Kurz } 3888dd654e03SGreg Kurz 388960ce86c7SWei Liu /* Make the file fid point to xattr */ 389060ce86c7SWei Liu xattr_fidp = file_fidp; 389160ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 389260ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3893dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 389460ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3895aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 389660ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 389760ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3898eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 389960ce86c7SWei Liu err = offset; 3900dd654e03SGreg Kurz out_put_fid: 390160ce86c7SWei Liu put_fid(pdu, file_fidp); 390260ce86c7SWei Liu out_nofid: 390360ce86c7SWei Liu pdu_complete(pdu, err); 390460ce86c7SWei Liu v9fs_string_free(&name); 390560ce86c7SWei Liu } 390660ce86c7SWei Liu 39078440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 390860ce86c7SWei Liu { 390960ce86c7SWei Liu V9fsPDU *pdu = opaque; 391060ce86c7SWei Liu size_t offset = 7; 391160ce86c7SWei Liu V9fsString target; 391260ce86c7SWei Liu int32_t fid; 391360ce86c7SWei Liu int err = 0; 391460ce86c7SWei Liu V9fsFidState *fidp; 391560ce86c7SWei Liu 391660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 391760ce86c7SWei Liu if (err < 0) { 391860ce86c7SWei Liu goto out_nofid; 391960ce86c7SWei Liu } 392060ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 392160ce86c7SWei Liu fidp = get_fid(pdu, fid); 392260ce86c7SWei Liu if (fidp == NULL) { 392360ce86c7SWei Liu err = -ENOENT; 392460ce86c7SWei Liu goto out_nofid; 392560ce86c7SWei Liu } 392660ce86c7SWei Liu 392760ce86c7SWei Liu v9fs_string_init(&target); 392860ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 392960ce86c7SWei Liu if (err < 0) { 393060ce86c7SWei Liu goto out; 393160ce86c7SWei Liu } 393260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 393360ce86c7SWei Liu if (err < 0) { 393460ce86c7SWei Liu v9fs_string_free(&target); 393560ce86c7SWei Liu goto out; 393660ce86c7SWei Liu } 393760ce86c7SWei Liu err += offset; 393860ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 393960ce86c7SWei Liu v9fs_string_free(&target); 394060ce86c7SWei Liu out: 394160ce86c7SWei Liu put_fid(pdu, fidp); 394260ce86c7SWei Liu out_nofid: 394360ce86c7SWei Liu pdu_complete(pdu, err); 394460ce86c7SWei Liu } 394560ce86c7SWei Liu 394660ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 394760ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 394860ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 394960ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 395060ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 395160ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 395260ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 395360ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 395460ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 395560ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 395660ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 395760ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 395860ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 395960ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 396060ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 396160ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 396260ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 396360ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 396460ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 396560ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 396660ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 396760ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 396860ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 396960ce86c7SWei Liu [P9_TREAD] = v9fs_read, 397060ce86c7SWei Liu #if 0 397160ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 397260ce86c7SWei Liu #endif 397360ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 397460ce86c7SWei Liu [P9_TLINK] = v9fs_link, 397560ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 397660ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 397760ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 397860ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 397960ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 398060ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 398160ce86c7SWei Liu }; 398260ce86c7SWei Liu 39838440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 398460ce86c7SWei Liu { 398560ce86c7SWei Liu V9fsPDU *pdu = opaque; 398660ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 398760ce86c7SWei Liu } 398860ce86c7SWei Liu 39898440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 399060ce86c7SWei Liu { 399160ce86c7SWei Liu V9fsPDU *pdu = opaque; 399260ce86c7SWei Liu pdu_complete(pdu, -EROFS); 399360ce86c7SWei Liu } 399460ce86c7SWei Liu 399560ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 399660ce86c7SWei Liu { 399760ce86c7SWei Liu switch (pdu->id) { 399860ce86c7SWei Liu case P9_TREADDIR: 399960ce86c7SWei Liu case P9_TSTATFS: 400060ce86c7SWei Liu case P9_TGETATTR: 400160ce86c7SWei Liu case P9_TXATTRWALK: 400260ce86c7SWei Liu case P9_TLOCK: 400360ce86c7SWei Liu case P9_TGETLOCK: 400460ce86c7SWei Liu case P9_TREADLINK: 400560ce86c7SWei Liu case P9_TVERSION: 400660ce86c7SWei Liu case P9_TLOPEN: 400760ce86c7SWei Liu case P9_TATTACH: 400860ce86c7SWei Liu case P9_TSTAT: 400960ce86c7SWei Liu case P9_TWALK: 401060ce86c7SWei Liu case P9_TCLUNK: 401160ce86c7SWei Liu case P9_TFSYNC: 401260ce86c7SWei Liu case P9_TOPEN: 401360ce86c7SWei Liu case P9_TREAD: 401460ce86c7SWei Liu case P9_TAUTH: 401560ce86c7SWei Liu case P9_TFLUSH: 401660ce86c7SWei Liu return 1; 401760ce86c7SWei Liu default: 401860ce86c7SWei Liu return 0; 401960ce86c7SWei Liu } 402060ce86c7SWei Liu } 402160ce86c7SWei Liu 4022506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 402360ce86c7SWei Liu { 402460ce86c7SWei Liu Coroutine *co; 402560ce86c7SWei Liu CoroutineEntry *handler; 402660ce86c7SWei Liu V9fsState *s = pdu->s; 402760ce86c7SWei Liu 4028506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4029506f3275SGreg Kurz pdu->id = hdr->id; 4030506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4031506f3275SGreg Kurz 403260ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 403360ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 403460ce86c7SWei Liu handler = v9fs_op_not_supp; 4035d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4036d1471233SGreg Kurz handler = v9fs_fs_ro; 403760ce86c7SWei Liu } else { 403860ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 403960ce86c7SWei Liu } 404060ce86c7SWei Liu 4041506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 40420b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 40430b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 404460ce86c7SWei Liu } 404560ce86c7SWei Liu 40462a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4047066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4048066eb006SGreg Kurz Error **errp) 40492a0c56aaSWei Liu { 405092c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 40512a0c56aaSWei Liu int i, len; 40522a0c56aaSWei Liu struct stat stat; 40532a0c56aaSWei Liu FsDriverEntry *fse; 40542a0c56aaSWei Liu V9fsPath path; 40552a0c56aaSWei Liu int rc = 1; 40562a0c56aaSWei Liu 4057066eb006SGreg Kurz assert(!s->transport); 4058066eb006SGreg Kurz s->transport = t; 4059066eb006SGreg Kurz 40602a0c56aaSWei Liu /* initialize pdu allocator */ 40612a0c56aaSWei Liu QLIST_INIT(&s->free_list); 40622a0c56aaSWei Liu QLIST_INIT(&s->active_list); 40630d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4064583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4065583f21f8SStefano Stabellini s->pdus[i].s = s; 4066583f21f8SStefano Stabellini s->pdus[i].idx = i; 40672a0c56aaSWei Liu } 40682a0c56aaSWei Liu 40692a0c56aaSWei Liu v9fs_path_init(&path); 40702a0c56aaSWei Liu 40712a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 40722a0c56aaSWei Liu 40732a0c56aaSWei Liu if (!fse) { 40742a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 40752a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 40762a0c56aaSWei Liu "id = %s", 40772a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 40782a0c56aaSWei Liu goto out; 40792a0c56aaSWei Liu } 40802a0c56aaSWei Liu 40812a0c56aaSWei Liu if (!s->fsconf.tag) { 40822a0c56aaSWei Liu /* we haven't specified a mount_tag */ 40832a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 40842a0c56aaSWei Liu s->fsconf.fsdev_id); 40852a0c56aaSWei Liu goto out; 40862a0c56aaSWei Liu } 40872a0c56aaSWei Liu 40882a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 40892a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 40902a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 40912a0c56aaSWei Liu len = strlen(s->fsconf.tag); 40922a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 40932a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 40942a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 40952a0c56aaSWei Liu goto out; 40962a0c56aaSWei Liu } 40972a0c56aaSWei Liu 40982a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 40992a0c56aaSWei Liu s->ctx.uid = -1; 41002a0c56aaSWei Liu 41012a0c56aaSWei Liu s->ops = fse->ops; 41022a0c56aaSWei Liu 4103b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4104b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4105b96feb2cSTobias Schramm 4106feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 41072a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 41082a0c56aaSWei Liu 410965603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 411065603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 411165603a80SGreg Kurz s->fsconf.fsdev_id); 41122a0c56aaSWei Liu goto out; 41132a0c56aaSWei Liu } 41142a0c56aaSWei Liu 41152a0c56aaSWei Liu /* 41162a0c56aaSWei Liu * Check details of export path, We need to use fs driver 41172a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 41182a0c56aaSWei Liu * use co-routines here. 41192a0c56aaSWei Liu */ 41202a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 41212a0c56aaSWei Liu error_setg(errp, 41222a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 41232a0c56aaSWei Liu goto out; 41242a0c56aaSWei Liu } 41252a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41262a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41272a0c56aaSWei Liu goto out; 41282a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41292a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41302a0c56aaSWei Liu goto out; 41312a0c56aaSWei Liu } 4132b8bbdb88SPradeep Jagadeesh 41333b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41343b5ee9e8SAntonios Motakis 41356b6aa828SChristian Schoenebeck /* init inode remapping : */ 41366b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 41376b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 41386b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 41396b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 41406b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 41411a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 41426b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 41436b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4144f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 41451a6ed33cSAntonios Motakis 4146b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4147b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4148b8bbdb88SPradeep Jagadeesh 41492a0c56aaSWei Liu rc = 0; 41502a0c56aaSWei Liu out: 41512a0c56aaSWei Liu if (rc) { 4152b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4153702dbcc2SLi Qiang } 41542a0c56aaSWei Liu v9fs_path_free(&path); 41552a0c56aaSWei Liu return rc; 41562a0c56aaSWei Liu } 41572a0c56aaSWei Liu 4158b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 41592a0c56aaSWei Liu { 4160c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4161702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4162702dbcc2SLi Qiang } 4163c0da0cb7SGreg Kurz if (s->ctx.fst) { 4164b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4165c0da0cb7SGreg Kurz } 41662a0c56aaSWei Liu g_free(s->tag); 41676b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4168f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4169f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 41704774718eSLi Qiang g_free(s->ctx.fs_root); 41712a0c56aaSWei Liu } 41722a0c56aaSWei Liu 41730e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 41740e44a0fdSGreg Kurz V9fsPDU pdu; 41750e44a0fdSGreg Kurz bool done; 41760e44a0fdSGreg Kurz } VirtfsCoResetData; 41770e44a0fdSGreg Kurz 41780e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 41790e44a0fdSGreg Kurz { 41800e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 41810e44a0fdSGreg Kurz 41820e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 41830e44a0fdSGreg Kurz data->done = true; 41840e44a0fdSGreg Kurz } 41850e44a0fdSGreg Kurz 41860e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 41870e44a0fdSGreg Kurz { 41880e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 41890e44a0fdSGreg Kurz Coroutine *co; 41900e44a0fdSGreg Kurz 41910e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 41920e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41930e44a0fdSGreg Kurz } 41940e44a0fdSGreg Kurz 41950e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 41960e44a0fdSGreg Kurz qemu_coroutine_enter(co); 41970e44a0fdSGreg Kurz 41980e44a0fdSGreg Kurz while (!data.done) { 41990e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42000e44a0fdSGreg Kurz } 42010e44a0fdSGreg Kurz } 42020e44a0fdSGreg Kurz 420360ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 420460ce86c7SWei Liu { 420560ce86c7SWei Liu struct rlimit rlim; 420660ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 420763325b18SGreg Kurz error_report("Failed to get the resource limit"); 420860ce86c7SWei Liu exit(1); 420960ce86c7SWei Liu } 421060ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 421160ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 421260ce86c7SWei Liu } 4213