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 97460ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 97560ce86c7SWei Liu { 97660ce86c7SWei Liu V9fsPDU *pdu = NULL; 97760ce86c7SWei Liu 97860ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 97960ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 98060ce86c7SWei Liu QLIST_REMOVE(pdu, next); 98160ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 98260ce86c7SWei Liu } 98360ce86c7SWei Liu return pdu; 98460ce86c7SWei Liu } 98560ce86c7SWei Liu 98660ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 98760ce86c7SWei Liu { 98860ce86c7SWei Liu V9fsState *s = pdu->s; 989f74e27bfSGreg Kurz 990f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 99160ce86c7SWei Liu QLIST_REMOVE(pdu, next); 99260ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 99360ce86c7SWei Liu } 99460ce86c7SWei Liu 9958440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 99660ce86c7SWei Liu { 99760ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 99860ce86c7SWei Liu V9fsState *s = pdu->s; 99906a37db7SGreg Kurz int ret; 100060ce86c7SWei Liu 1001fc78d5eeSKeno Fischer /* 1002fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1003fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1004fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1005fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1006fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1007fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1008fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1009fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1010fc78d5eeSKeno Fischer * transmission of the reply. 1011fc78d5eeSKeno Fischer */ 1012fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1013fc78d5eeSKeno Fischer if (discard) { 1014fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1015fc78d5eeSKeno Fischer pdu->size = 0; 1016fc78d5eeSKeno Fischer goto out_notify; 1017fc78d5eeSKeno Fischer } 1018fc78d5eeSKeno Fischer 101960ce86c7SWei Liu if (len < 0) { 102060ce86c7SWei Liu int err = -len; 102160ce86c7SWei Liu len = 7; 102260ce86c7SWei Liu 102360ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 102460ce86c7SWei Liu V9fsString str; 102560ce86c7SWei Liu 102660ce86c7SWei Liu str.data = strerror(err); 102760ce86c7SWei Liu str.size = strlen(str.data); 102860ce86c7SWei Liu 102906a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 103006a37db7SGreg Kurz if (ret < 0) { 103106a37db7SGreg Kurz goto out_notify; 103206a37db7SGreg Kurz } 103306a37db7SGreg Kurz len += ret; 103460ce86c7SWei Liu id = P9_RERROR; 103560ce86c7SWei Liu } 103660ce86c7SWei Liu 103706a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 103806a37db7SGreg Kurz if (ret < 0) { 103906a37db7SGreg Kurz goto out_notify; 104006a37db7SGreg Kurz } 104106a37db7SGreg Kurz len += ret; 104260ce86c7SWei Liu 104360ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 104460ce86c7SWei Liu id = P9_RLERROR; 104560ce86c7SWei Liu } 104660ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 104760ce86c7SWei Liu } 104860ce86c7SWei Liu 104960ce86c7SWei Liu /* fill out the header */ 105006a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 105106a37db7SGreg Kurz goto out_notify; 105206a37db7SGreg Kurz } 105360ce86c7SWei Liu 105460ce86c7SWei Liu /* keep these in sync */ 105560ce86c7SWei Liu pdu->size = len; 105660ce86c7SWei Liu pdu->id = id; 105760ce86c7SWei Liu 105806a37db7SGreg Kurz out_notify: 1059a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 106060ce86c7SWei Liu 106160ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1062f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 106360ce86c7SWei Liu pdu_free(pdu); 106460ce86c7SWei Liu } 1065f74e27bfSGreg Kurz } 106660ce86c7SWei Liu 106760ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 106860ce86c7SWei Liu { 106960ce86c7SWei Liu mode_t ret; 107060ce86c7SWei Liu 107160ce86c7SWei Liu ret = mode & 0777; 107260ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 107360ce86c7SWei Liu ret |= S_IFDIR; 107460ce86c7SWei Liu } 107560ce86c7SWei Liu 107660ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 107760ce86c7SWei Liu ret |= S_IFLNK; 107860ce86c7SWei Liu } 107960ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 108060ce86c7SWei Liu ret |= S_IFSOCK; 108160ce86c7SWei Liu } 108260ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 108360ce86c7SWei Liu ret |= S_IFIFO; 108460ce86c7SWei Liu } 108560ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 108660ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 108760ce86c7SWei Liu ret |= S_IFCHR; 108860ce86c7SWei Liu } else { 108960ce86c7SWei Liu ret |= S_IFBLK; 109060ce86c7SWei Liu } 109160ce86c7SWei Liu } 109260ce86c7SWei Liu 109360ce86c7SWei Liu if (!(ret & ~0777)) { 109460ce86c7SWei Liu ret |= S_IFREG; 109560ce86c7SWei Liu } 109660ce86c7SWei Liu 109760ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 109860ce86c7SWei Liu ret |= S_ISUID; 109960ce86c7SWei Liu } 110060ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 110160ce86c7SWei Liu ret |= S_ISGID; 110260ce86c7SWei Liu } 110360ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 110460ce86c7SWei Liu ret |= S_ISVTX; 110560ce86c7SWei Liu } 110660ce86c7SWei Liu 110760ce86c7SWei Liu return ret; 110860ce86c7SWei Liu } 110960ce86c7SWei Liu 111060ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 111160ce86c7SWei Liu { 111260ce86c7SWei Liu if (stat->type == -1 && 111360ce86c7SWei Liu stat->dev == -1 && 111487032833SAntonios Motakis stat->qid.type == 0xff && 111587032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 111687032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 111760ce86c7SWei Liu stat->mode == -1 && 111860ce86c7SWei Liu stat->atime == -1 && 111960ce86c7SWei Liu stat->mtime == -1 && 112060ce86c7SWei Liu stat->length == -1 && 112160ce86c7SWei Liu !stat->name.size && 112260ce86c7SWei Liu !stat->uid.size && 112360ce86c7SWei Liu !stat->gid.size && 112460ce86c7SWei Liu !stat->muid.size && 112560ce86c7SWei Liu stat->n_uid == -1 && 112660ce86c7SWei Liu stat->n_gid == -1 && 112760ce86c7SWei Liu stat->n_muid == -1) { 112860ce86c7SWei Liu return 1; 112960ce86c7SWei Liu } 113060ce86c7SWei Liu 113160ce86c7SWei Liu return 0; 113260ce86c7SWei Liu } 113360ce86c7SWei Liu 113460ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 113560ce86c7SWei Liu { 113660ce86c7SWei Liu v9fs_string_init(&stat->name); 113760ce86c7SWei Liu v9fs_string_init(&stat->uid); 113860ce86c7SWei Liu v9fs_string_init(&stat->gid); 113960ce86c7SWei Liu v9fs_string_init(&stat->muid); 114060ce86c7SWei Liu v9fs_string_init(&stat->extension); 114160ce86c7SWei Liu } 114260ce86c7SWei Liu 114360ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 114460ce86c7SWei Liu { 114560ce86c7SWei Liu v9fs_string_free(&stat->name); 114660ce86c7SWei Liu v9fs_string_free(&stat->uid); 114760ce86c7SWei Liu v9fs_string_free(&stat->gid); 114860ce86c7SWei Liu v9fs_string_free(&stat->muid); 114960ce86c7SWei Liu v9fs_string_free(&stat->extension); 115060ce86c7SWei Liu } 115160ce86c7SWei Liu 115260ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 115360ce86c7SWei Liu { 115460ce86c7SWei Liu uint32_t mode; 115560ce86c7SWei Liu 115660ce86c7SWei Liu mode = stbuf->st_mode & 0777; 115760ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 115860ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 115960ce86c7SWei Liu } 116060ce86c7SWei Liu 116160ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 116260ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 116360ce86c7SWei Liu } 116460ce86c7SWei Liu 116560ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 116660ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 116760ce86c7SWei Liu } 116860ce86c7SWei Liu 116960ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 117060ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 117160ce86c7SWei Liu } 117260ce86c7SWei Liu 117360ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 117460ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 117560ce86c7SWei Liu } 117660ce86c7SWei Liu 117760ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 117860ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 117960ce86c7SWei Liu } 118060ce86c7SWei Liu 118160ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 118260ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 118360ce86c7SWei Liu } 118460ce86c7SWei Liu 118560ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 118660ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 118760ce86c7SWei Liu } 118860ce86c7SWei Liu 118960ce86c7SWei Liu return mode; 119060ce86c7SWei Liu } 119160ce86c7SWei Liu 11926069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 11936069537fSJan Dakinevich const char *basename, 119460ce86c7SWei Liu const struct stat *stbuf, 119560ce86c7SWei Liu V9fsStat *v9stat) 119660ce86c7SWei Liu { 119760ce86c7SWei Liu int err; 119860ce86c7SWei Liu 119960ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 120060ce86c7SWei Liu 12013b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12023b5ee9e8SAntonios Motakis if (err < 0) { 12033b5ee9e8SAntonios Motakis return err; 12043b5ee9e8SAntonios Motakis } 120560ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 120660ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 120760ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 120860ce86c7SWei Liu v9stat->length = stbuf->st_size; 120960ce86c7SWei Liu 1210abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1211abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1212abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 121360ce86c7SWei Liu 121460ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 121560ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 121660ce86c7SWei Liu v9stat->n_muid = 0; 121760ce86c7SWei Liu 1218abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 121960ce86c7SWei Liu 122060ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12216069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 122260ce86c7SWei Liu if (err < 0) { 122360ce86c7SWei Liu return err; 122460ce86c7SWei Liu } 122560ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 122660ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 122760ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 122860ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 122960ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 123060ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 123160ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 123260ce86c7SWei Liu } 123360ce86c7SWei Liu 12346069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 123560ce86c7SWei Liu 123660ce86c7SWei Liu v9stat->size = 61 + 123760ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 123860ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 123960ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 124060ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 124160ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 124260ce86c7SWei Liu return 0; 124360ce86c7SWei Liu } 124460ce86c7SWei Liu 124560ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 124660ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 124760ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 124860ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 124960ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 125060ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 125160ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 125260ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 125360ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 125460ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 125560ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 125660ce86c7SWei Liu 125760ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 125860ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 125960ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 126060ce86c7SWei Liu 126160ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 126260ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 126360ce86c7SWei Liu 126460ce86c7SWei Liu 1265*669ced09SChristian Schoenebeck static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf) 1266*669ced09SChristian Schoenebeck { 1267*669ced09SChristian Schoenebeck int32_t iounit = 0; 1268*669ced09SChristian Schoenebeck V9fsState *s = pdu->s; 1269*669ced09SChristian Schoenebeck 1270*669ced09SChristian Schoenebeck /* 1271*669ced09SChristian Schoenebeck * iounit should be multiples of st_blksize (host filesystem block size) 1272*669ced09SChristian Schoenebeck * as well as less than (client msize - P9_IOHDRSZ) 1273*669ced09SChristian Schoenebeck */ 1274*669ced09SChristian Schoenebeck if (stbuf->st_blksize) { 1275*669ced09SChristian Schoenebeck iounit = stbuf->st_blksize; 1276*669ced09SChristian Schoenebeck iounit *= (s->msize - P9_IOHDRSZ) / stbuf->st_blksize; 1277*669ced09SChristian Schoenebeck } 1278*669ced09SChristian Schoenebeck if (!iounit) { 1279*669ced09SChristian Schoenebeck iounit = s->msize - P9_IOHDRSZ; 1280*669ced09SChristian Schoenebeck } 1281*669ced09SChristian Schoenebeck return iounit; 1282*669ced09SChristian Schoenebeck } 1283*669ced09SChristian Schoenebeck 12843b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 128560ce86c7SWei Liu V9fsStatDotl *v9lstat) 128660ce86c7SWei Liu { 128760ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 128860ce86c7SWei Liu 128960ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 129060ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 129160ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 129260ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 129360ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 129460ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 1295*669ced09SChristian Schoenebeck v9lstat->st_blksize = stat_to_iounit(pdu, stbuf); 129660ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 129760ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 129860ce86c7SWei Liu v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 129960ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 130060ce86c7SWei Liu v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 130160ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 130260ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 130360ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 130460ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 130560ce86c7SWei Liu 13063b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 130760ce86c7SWei Liu } 130860ce86c7SWei Liu 130960ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 131060ce86c7SWei Liu { 131160ce86c7SWei Liu int i; 131260ce86c7SWei Liu 131360ce86c7SWei Liu printf("sg[%d]: {", cnt); 131460ce86c7SWei Liu for (i = 0; i < cnt; i++) { 131560ce86c7SWei Liu if (i) { 131660ce86c7SWei Liu printf(", "); 131760ce86c7SWei Liu } 131860ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 131960ce86c7SWei Liu } 132060ce86c7SWei Liu printf("}\n"); 132160ce86c7SWei Liu } 132260ce86c7SWei Liu 132360ce86c7SWei Liu /* Will call this only for path name based fid */ 132460ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 132560ce86c7SWei Liu { 132660ce86c7SWei Liu V9fsPath str; 132760ce86c7SWei Liu v9fs_path_init(&str); 132860ce86c7SWei Liu v9fs_path_copy(&str, dst); 1329e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 133060ce86c7SWei Liu v9fs_path_free(&str); 133160ce86c7SWei Liu } 133260ce86c7SWei Liu 133360ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 133460ce86c7SWei Liu { 133560ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 133660ce86c7SWei Liu } 133760ce86c7SWei Liu 13388440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 133960ce86c7SWei Liu { 134060ce86c7SWei Liu ssize_t err; 134160ce86c7SWei Liu V9fsPDU *pdu = opaque; 134260ce86c7SWei Liu V9fsState *s = pdu->s; 134360ce86c7SWei Liu V9fsString version; 134460ce86c7SWei Liu size_t offset = 7; 134560ce86c7SWei Liu 134660ce86c7SWei Liu v9fs_string_init(&version); 134760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 134860ce86c7SWei Liu if (err < 0) { 134960ce86c7SWei Liu goto out; 135060ce86c7SWei Liu } 135160ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 135260ce86c7SWei Liu 135360ce86c7SWei Liu virtfs_reset(pdu); 135460ce86c7SWei Liu 135560ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 135660ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 135760ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 135860ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 135960ce86c7SWei Liu } else { 136060ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1361e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1362e16453a3SChristian Schoenebeck goto marshal; 136360ce86c7SWei Liu } 136460ce86c7SWei Liu 1365e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1366e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1367e16453a3SChristian Schoenebeck error_report( 1368e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1369e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1370e16453a3SChristian Schoenebeck ); 1371e16453a3SChristian Schoenebeck goto out; 1372e16453a3SChristian Schoenebeck } 1373e16453a3SChristian Schoenebeck 137462777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1375c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 137662777d82SChristian Schoenebeck warn_report_once( 137762777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 137862777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 137962777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 138062777d82SChristian Schoenebeck ); 138162777d82SChristian Schoenebeck } 138262777d82SChristian Schoenebeck 1383e16453a3SChristian Schoenebeck marshal: 138460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 138560ce86c7SWei Liu if (err < 0) { 138660ce86c7SWei Liu goto out; 138760ce86c7SWei Liu } 1388403a905bSPhilippe Mathieu-Daudé err += offset; 138960ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 139060ce86c7SWei Liu out: 1391403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 139260ce86c7SWei Liu v9fs_string_free(&version); 139360ce86c7SWei Liu } 139460ce86c7SWei Liu 13958440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 139660ce86c7SWei Liu { 139760ce86c7SWei Liu V9fsPDU *pdu = opaque; 139860ce86c7SWei Liu V9fsState *s = pdu->s; 139960ce86c7SWei Liu int32_t fid, afid, n_uname; 140060ce86c7SWei Liu V9fsString uname, aname; 140160ce86c7SWei Liu V9fsFidState *fidp; 140260ce86c7SWei Liu size_t offset = 7; 140360ce86c7SWei Liu V9fsQID qid; 140460ce86c7SWei Liu ssize_t err; 140511024375SChristian Schoenebeck struct stat stbuf; 140660ce86c7SWei Liu 140760ce86c7SWei Liu v9fs_string_init(&uname); 140860ce86c7SWei Liu v9fs_string_init(&aname); 140960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 141060ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 141160ce86c7SWei Liu if (err < 0) { 141260ce86c7SWei Liu goto out_nofid; 141360ce86c7SWei Liu } 141460ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 141560ce86c7SWei Liu 141660ce86c7SWei Liu fidp = alloc_fid(s, fid); 141760ce86c7SWei Liu if (fidp == NULL) { 141860ce86c7SWei Liu err = -EINVAL; 141960ce86c7SWei Liu goto out_nofid; 142060ce86c7SWei Liu } 142160ce86c7SWei Liu fidp->uid = n_uname; 142260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 142360ce86c7SWei Liu if (err < 0) { 142460ce86c7SWei Liu err = -EINVAL; 142560ce86c7SWei Liu clunk_fid(s, fid); 142660ce86c7SWei Liu goto out; 142760ce86c7SWei Liu } 142811024375SChristian Schoenebeck err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 142911024375SChristian Schoenebeck if (err < 0) { 143011024375SChristian Schoenebeck err = -EINVAL; 143111024375SChristian Schoenebeck clunk_fid(s, fid); 143211024375SChristian Schoenebeck goto out; 143311024375SChristian Schoenebeck } 143411024375SChristian Schoenebeck err = stat_to_qid(pdu, &stbuf, &qid); 143560ce86c7SWei Liu if (err < 0) { 143660ce86c7SWei Liu err = -EINVAL; 143760ce86c7SWei Liu clunk_fid(s, fid); 143860ce86c7SWei Liu goto out; 143960ce86c7SWei Liu } 1440fe44dc91SAshijeet Acharya 1441fe44dc91SAshijeet Acharya /* 1442fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1443fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1444fe44dc91SAshijeet Acharya */ 1445fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1446fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1447fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1448fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14499261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14509261ef5eSMarkus Armbruster if (err < 0) { 1451fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1452fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1453fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1454fe44dc91SAshijeet Acharya goto out; 1455fe44dc91SAshijeet Acharya } 1456fe44dc91SAshijeet Acharya s->root_fid = fid; 1457fe44dc91SAshijeet Acharya } 1458fe44dc91SAshijeet Acharya 145960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 146060ce86c7SWei Liu if (err < 0) { 146160ce86c7SWei Liu clunk_fid(s, fid); 146260ce86c7SWei Liu goto out; 146360ce86c7SWei Liu } 146460ce86c7SWei Liu err += offset; 1465fe44dc91SAshijeet Acharya 146611024375SChristian Schoenebeck memcpy(&s->root_st, &stbuf, sizeof(stbuf)); 146760ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 146860ce86c7SWei Liu qid.type, qid.version, qid.path); 146960ce86c7SWei Liu out: 147060ce86c7SWei Liu put_fid(pdu, fidp); 147160ce86c7SWei Liu out_nofid: 147260ce86c7SWei Liu pdu_complete(pdu, err); 147360ce86c7SWei Liu v9fs_string_free(&uname); 147460ce86c7SWei Liu v9fs_string_free(&aname); 147560ce86c7SWei Liu } 147660ce86c7SWei Liu 14778440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 147860ce86c7SWei Liu { 147960ce86c7SWei Liu int32_t fid; 148060ce86c7SWei Liu V9fsStat v9stat; 148160ce86c7SWei Liu ssize_t err = 0; 148260ce86c7SWei Liu size_t offset = 7; 148360ce86c7SWei Liu struct stat stbuf; 148460ce86c7SWei Liu V9fsFidState *fidp; 148560ce86c7SWei Liu V9fsPDU *pdu = opaque; 14866069537fSJan Dakinevich char *basename; 148760ce86c7SWei Liu 148860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 148960ce86c7SWei Liu if (err < 0) { 149060ce86c7SWei Liu goto out_nofid; 149160ce86c7SWei Liu } 149260ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 149360ce86c7SWei Liu 149460ce86c7SWei Liu fidp = get_fid(pdu, fid); 149560ce86c7SWei Liu if (fidp == NULL) { 149660ce86c7SWei Liu err = -ENOENT; 149760ce86c7SWei Liu goto out_nofid; 149860ce86c7SWei Liu } 149960ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 150060ce86c7SWei Liu if (err < 0) { 150160ce86c7SWei Liu goto out; 150260ce86c7SWei Liu } 15036069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 15046069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 15056069537fSJan Dakinevich g_free(basename); 150660ce86c7SWei Liu if (err < 0) { 150760ce86c7SWei Liu goto out; 150860ce86c7SWei Liu } 150960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 151060ce86c7SWei Liu if (err < 0) { 151160ce86c7SWei Liu v9fs_stat_free(&v9stat); 151260ce86c7SWei Liu goto out; 151360ce86c7SWei Liu } 151460ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 151560ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 151660ce86c7SWei Liu err += offset; 151760ce86c7SWei Liu v9fs_stat_free(&v9stat); 151860ce86c7SWei Liu out: 151960ce86c7SWei Liu put_fid(pdu, fidp); 152060ce86c7SWei Liu out_nofid: 152160ce86c7SWei Liu pdu_complete(pdu, err); 152260ce86c7SWei Liu } 152360ce86c7SWei Liu 15248440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 152560ce86c7SWei Liu { 152660ce86c7SWei Liu int32_t fid; 152760ce86c7SWei Liu size_t offset = 7; 152860ce86c7SWei Liu ssize_t retval = 0; 152960ce86c7SWei Liu struct stat stbuf; 153060ce86c7SWei Liu V9fsFidState *fidp; 153160ce86c7SWei Liu uint64_t request_mask; 153260ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 153360ce86c7SWei Liu V9fsPDU *pdu = opaque; 153460ce86c7SWei Liu 153560ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 153660ce86c7SWei Liu if (retval < 0) { 153760ce86c7SWei Liu goto out_nofid; 153860ce86c7SWei Liu } 153960ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 154060ce86c7SWei Liu 154160ce86c7SWei Liu fidp = get_fid(pdu, fid); 154260ce86c7SWei Liu if (fidp == NULL) { 154360ce86c7SWei Liu retval = -ENOENT; 154460ce86c7SWei Liu goto out_nofid; 154560ce86c7SWei Liu } 154660ce86c7SWei Liu /* 154760ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 154860ce86c7SWei Liu * need to look at request_mask. 154960ce86c7SWei Liu */ 155060ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 155160ce86c7SWei Liu if (retval < 0) { 155260ce86c7SWei Liu goto out; 155360ce86c7SWei Liu } 15543b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15553b5ee9e8SAntonios Motakis if (retval < 0) { 15563b5ee9e8SAntonios Motakis goto out; 15573b5ee9e8SAntonios Motakis } 155860ce86c7SWei Liu 155960ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 156060ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 156160ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 156260ce86c7SWei Liu switch (retval) { 156360ce86c7SWei Liu case 0: 156460ce86c7SWei Liu /* we have valid st_gen: update result mask */ 156560ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 156660ce86c7SWei Liu break; 156760ce86c7SWei Liu case -EINTR: 156860ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 156960ce86c7SWei Liu goto out; 157060ce86c7SWei Liu default: 157160ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 157260ce86c7SWei Liu break; 157360ce86c7SWei Liu } 157460ce86c7SWei Liu } 157560ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 157660ce86c7SWei Liu if (retval < 0) { 157760ce86c7SWei Liu goto out; 157860ce86c7SWei Liu } 157960ce86c7SWei Liu retval += offset; 158060ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 158160ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 158260ce86c7SWei Liu v9stat_dotl.st_gid); 158360ce86c7SWei Liu out: 158460ce86c7SWei Liu put_fid(pdu, fidp); 158560ce86c7SWei Liu out_nofid: 158660ce86c7SWei Liu pdu_complete(pdu, retval); 158760ce86c7SWei Liu } 158860ce86c7SWei Liu 158960ce86c7SWei Liu /* Attribute flags */ 159060ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 159160ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 159260ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 159360ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 159460ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 159560ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 159660ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 159760ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 159860ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 159960ce86c7SWei Liu 160060ce86c7SWei Liu #define P9_ATTR_MASK 127 160160ce86c7SWei Liu 16028440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 160360ce86c7SWei Liu { 160460ce86c7SWei Liu int err = 0; 160560ce86c7SWei Liu int32_t fid; 160660ce86c7SWei Liu V9fsFidState *fidp; 160760ce86c7SWei Liu size_t offset = 7; 160860ce86c7SWei Liu V9fsIattr v9iattr; 160960ce86c7SWei Liu V9fsPDU *pdu = opaque; 161060ce86c7SWei Liu 161160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 161260ce86c7SWei Liu if (err < 0) { 161360ce86c7SWei Liu goto out_nofid; 161460ce86c7SWei Liu } 161560ce86c7SWei Liu 16168f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16178f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16188f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16198f9c64bfSGreg Kurz 162060ce86c7SWei Liu fidp = get_fid(pdu, fid); 162160ce86c7SWei Liu if (fidp == NULL) { 162260ce86c7SWei Liu err = -EINVAL; 162360ce86c7SWei Liu goto out_nofid; 162460ce86c7SWei Liu } 162560ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 162660ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 162760ce86c7SWei Liu if (err < 0) { 162860ce86c7SWei Liu goto out; 162960ce86c7SWei Liu } 163060ce86c7SWei Liu } 163160ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 163260ce86c7SWei Liu struct timespec times[2]; 163360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 163460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 163560ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 163660ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 163760ce86c7SWei Liu } else { 163860ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 163960ce86c7SWei Liu } 164060ce86c7SWei Liu } else { 164160ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 164260ce86c7SWei Liu } 164360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 164460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 164560ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 164660ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 164760ce86c7SWei Liu } else { 164860ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 164960ce86c7SWei Liu } 165060ce86c7SWei Liu } else { 165160ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 165260ce86c7SWei Liu } 165360ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 165460ce86c7SWei Liu if (err < 0) { 165560ce86c7SWei Liu goto out; 165660ce86c7SWei Liu } 165760ce86c7SWei Liu } 165860ce86c7SWei Liu /* 165960ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 166060ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 166160ce86c7SWei Liu */ 166260ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 166360ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 166460ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 166560ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 166660ce86c7SWei Liu v9iattr.uid = -1; 166760ce86c7SWei Liu } 166860ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 166960ce86c7SWei Liu v9iattr.gid = -1; 167060ce86c7SWei Liu } 167160ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 167260ce86c7SWei Liu v9iattr.gid); 167360ce86c7SWei Liu if (err < 0) { 167460ce86c7SWei Liu goto out; 167560ce86c7SWei Liu } 167660ce86c7SWei Liu } 167760ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 167860ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 167960ce86c7SWei Liu if (err < 0) { 168060ce86c7SWei Liu goto out; 168160ce86c7SWei Liu } 168260ce86c7SWei Liu } 168360ce86c7SWei Liu err = offset; 16848f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 168560ce86c7SWei Liu out: 168660ce86c7SWei Liu put_fid(pdu, fidp); 168760ce86c7SWei Liu out_nofid: 168860ce86c7SWei Liu pdu_complete(pdu, err); 168960ce86c7SWei Liu } 169060ce86c7SWei Liu 169160ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 169260ce86c7SWei Liu { 169360ce86c7SWei Liu int i; 169460ce86c7SWei Liu ssize_t err; 169560ce86c7SWei Liu size_t offset = 7; 169660ce86c7SWei Liu 169760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 169860ce86c7SWei Liu if (err < 0) { 169960ce86c7SWei Liu return err; 170060ce86c7SWei Liu } 170160ce86c7SWei Liu offset += err; 170260ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 170360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 170460ce86c7SWei Liu if (err < 0) { 170560ce86c7SWei Liu return err; 170660ce86c7SWei Liu } 170760ce86c7SWei Liu offset += err; 170860ce86c7SWei Liu } 170960ce86c7SWei Liu return offset; 171060ce86c7SWei Liu } 171160ce86c7SWei Liu 1712fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1713fff39a7aSGreg Kurz { 1714fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1715fff39a7aSGreg Kurz } 1716fff39a7aSGreg Kurz 1717f22cad42SChristian Schoenebeck static bool same_stat_id(const struct stat *a, const struct stat *b) 171856f101ecSGreg Kurz { 1719f22cad42SChristian Schoenebeck return a->st_dev == b->st_dev && a->st_ino == b->st_ino; 172056f101ecSGreg Kurz } 172156f101ecSGreg Kurz 17228440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 172360ce86c7SWei Liu { 172460ce86c7SWei Liu int name_idx; 1725869605b5SChristian Schoenebeck g_autofree V9fsQID *qids = NULL; 172660ce86c7SWei Liu int i, err = 0; 17278d6cb100SChristian Schoenebeck V9fsPath dpath, path, *pathes = NULL; 172860ce86c7SWei Liu uint16_t nwnames; 1729869605b5SChristian Schoenebeck struct stat stbuf, fidst; 1730869605b5SChristian Schoenebeck g_autofree struct stat *stbufs = NULL; 173160ce86c7SWei Liu size_t offset = 7; 173260ce86c7SWei Liu int32_t fid, newfid; 173360ce86c7SWei Liu V9fsString *wnames = NULL; 173460ce86c7SWei Liu V9fsFidState *fidp; 173560ce86c7SWei Liu V9fsFidState *newfidp = NULL; 173660ce86c7SWei Liu V9fsPDU *pdu = opaque; 173760ce86c7SWei Liu V9fsState *s = pdu->s; 173856f101ecSGreg Kurz V9fsQID qid; 173960ce86c7SWei Liu 174060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 174160ce86c7SWei Liu if (err < 0) { 174260ce86c7SWei Liu pdu_complete(pdu, err); 174360ce86c7SWei Liu return ; 174460ce86c7SWei Liu } 174560ce86c7SWei Liu offset += err; 174660ce86c7SWei Liu 174760ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 174860ce86c7SWei Liu 1749232a4d2cSChristian Schoenebeck if (nwnames > P9_MAXWELEM) { 1750232a4d2cSChristian Schoenebeck err = -EINVAL; 1751232a4d2cSChristian Schoenebeck goto out_nofid; 1752232a4d2cSChristian Schoenebeck } 1753232a4d2cSChristian Schoenebeck if (nwnames) { 17541923923bSGreg Kurz wnames = g_new0(V9fsString, nwnames); 17551923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 17568d6cb100SChristian Schoenebeck stbufs = g_new0(struct stat, nwnames); 17578d6cb100SChristian Schoenebeck pathes = g_new0(V9fsPath, nwnames); 175860ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 175960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 176060ce86c7SWei Liu if (err < 0) { 176160ce86c7SWei Liu goto out_nofid; 176260ce86c7SWei Liu } 1763fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1764fff39a7aSGreg Kurz err = -ENOENT; 1765fff39a7aSGreg Kurz goto out_nofid; 1766fff39a7aSGreg Kurz } 176760ce86c7SWei Liu offset += err; 176860ce86c7SWei Liu } 176960ce86c7SWei Liu } 177060ce86c7SWei Liu fidp = get_fid(pdu, fid); 177160ce86c7SWei Liu if (fidp == NULL) { 177260ce86c7SWei Liu err = -ENOENT; 177360ce86c7SWei Liu goto out_nofid; 177460ce86c7SWei Liu } 177556f101ecSGreg Kurz 177613fd08e6SGreg Kurz v9fs_path_init(&dpath); 177713fd08e6SGreg Kurz v9fs_path_init(&path); 177860ce86c7SWei Liu /* 17798d6cb100SChristian Schoenebeck * Both dpath and path initially point to fidp. 178060ce86c7SWei Liu * Needed to handle request with nwnames == 0 178160ce86c7SWei Liu */ 178260ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 178360ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 17848d6cb100SChristian Schoenebeck 17858d6cb100SChristian Schoenebeck /* 17868d6cb100SChristian Schoenebeck * To keep latency (i.e. overall execution time for processing this 17878d6cb100SChristian Schoenebeck * Twalk client request) as small as possible, run all the required fs 17888d6cb100SChristian Schoenebeck * driver code altogether inside the following block. 17898d6cb100SChristian Schoenebeck */ 17908d6cb100SChristian Schoenebeck v9fs_co_run_in_worker({ 17918d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 17928d6cb100SChristian Schoenebeck err = -EINTR; 17938d6cb100SChristian Schoenebeck break; 17948d6cb100SChristian Schoenebeck } 17958d6cb100SChristian Schoenebeck err = s->ops->lstat(&s->ctx, &dpath, &fidst); 17968d6cb100SChristian Schoenebeck if (err < 0) { 17978d6cb100SChristian Schoenebeck err = -errno; 17988d6cb100SChristian Schoenebeck break; 17998d6cb100SChristian Schoenebeck } 18008d6cb100SChristian Schoenebeck stbuf = fidst; 180160ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 18028d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18038d6cb100SChristian Schoenebeck err = -EINTR; 18048d6cb100SChristian Schoenebeck break; 18058d6cb100SChristian Schoenebeck } 1806f22cad42SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18078d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18088d6cb100SChristian Schoenebeck { 18098d6cb100SChristian Schoenebeck err = s->ops->name_to_path(&s->ctx, &dpath, 181097b1d8fdSChristian Schoenebeck wnames[name_idx].data, 181197b1d8fdSChristian Schoenebeck &pathes[name_idx]); 18128d6cb100SChristian Schoenebeck if (err < 0) { 18138d6cb100SChristian Schoenebeck err = -errno; 18148d6cb100SChristian Schoenebeck break; 18158d6cb100SChristian Schoenebeck } 18168d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18178d6cb100SChristian Schoenebeck err = -EINTR; 18188d6cb100SChristian Schoenebeck break; 18198d6cb100SChristian Schoenebeck } 182097b1d8fdSChristian Schoenebeck err = s->ops->lstat(&s->ctx, &pathes[name_idx], &stbuf); 18218d6cb100SChristian Schoenebeck if (err < 0) { 18228d6cb100SChristian Schoenebeck err = -errno; 18238d6cb100SChristian Schoenebeck break; 18248d6cb100SChristian Schoenebeck } 18258d6cb100SChristian Schoenebeck stbufs[name_idx] = stbuf; 182697b1d8fdSChristian Schoenebeck v9fs_path_copy(&dpath, &pathes[name_idx]); 18278d6cb100SChristian Schoenebeck } 18288d6cb100SChristian Schoenebeck } 18298d6cb100SChristian Schoenebeck }); 18308d6cb100SChristian Schoenebeck /* 18318d6cb100SChristian Schoenebeck * Handle all the rest of this Twalk request on main thread ... 18328d6cb100SChristian Schoenebeck */ 183360ce86c7SWei Liu if (err < 0) { 183460ce86c7SWei Liu goto out; 183560ce86c7SWei Liu } 183656f101ecSGreg Kurz 18378d6cb100SChristian Schoenebeck err = stat_to_qid(pdu, &fidst, &qid); 183860ce86c7SWei Liu if (err < 0) { 183960ce86c7SWei Liu goto out; 184060ce86c7SWei Liu } 18418d6cb100SChristian Schoenebeck stbuf = fidst; 18428d6cb100SChristian Schoenebeck 18438d6cb100SChristian Schoenebeck /* reset dpath and path */ 18448d6cb100SChristian Schoenebeck v9fs_path_copy(&dpath, &fidp->path); 18458d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &fidp->path); 18468d6cb100SChristian Schoenebeck 18478d6cb100SChristian Schoenebeck for (name_idx = 0; name_idx < nwnames; name_idx++) { 18488d6cb100SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18498d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18508d6cb100SChristian Schoenebeck { 18518d6cb100SChristian Schoenebeck stbuf = stbufs[name_idx]; 18523b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18533b5ee9e8SAntonios Motakis if (err < 0) { 18543b5ee9e8SAntonios Motakis goto out; 18553b5ee9e8SAntonios Motakis } 18568d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &pathes[name_idx]); 185760ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 185860ce86c7SWei Liu } 185956f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 186056f101ecSGreg Kurz } 186160ce86c7SWei Liu if (fid == newfid) { 186249dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 186349dd946bSGreg Kurz err = -EINVAL; 186449dd946bSGreg Kurz goto out; 186549dd946bSGreg Kurz } 18665b3c77aaSGreg Kurz v9fs_path_write_lock(s); 186760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 18685b3c77aaSGreg Kurz v9fs_path_unlock(s); 186960ce86c7SWei Liu } else { 187060ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 187160ce86c7SWei Liu if (newfidp == NULL) { 187260ce86c7SWei Liu err = -EINVAL; 187360ce86c7SWei Liu goto out; 187460ce86c7SWei Liu } 187560ce86c7SWei Liu newfidp->uid = fidp->uid; 187660ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 187760ce86c7SWei Liu } 187860ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 187960ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 188060ce86c7SWei Liu out: 188160ce86c7SWei Liu put_fid(pdu, fidp); 188260ce86c7SWei Liu if (newfidp) { 188360ce86c7SWei Liu put_fid(pdu, newfidp); 188460ce86c7SWei Liu } 188560ce86c7SWei Liu v9fs_path_free(&dpath); 188660ce86c7SWei Liu v9fs_path_free(&path); 188760ce86c7SWei Liu out_nofid: 188860ce86c7SWei Liu pdu_complete(pdu, err); 188960ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 189060ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 189160ce86c7SWei Liu v9fs_string_free(&wnames[name_idx]); 18928d6cb100SChristian Schoenebeck v9fs_path_free(&pathes[name_idx]); 189360ce86c7SWei Liu } 189460ce86c7SWei Liu g_free(wnames); 18958d6cb100SChristian Schoenebeck g_free(pathes); 189660ce86c7SWei Liu } 189760ce86c7SWei Liu } 189860ce86c7SWei Liu 18998440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 190060ce86c7SWei Liu { 190160ce86c7SWei Liu struct statfs stbuf; 190260ce86c7SWei Liu int32_t iounit = 0; 190360ce86c7SWei Liu V9fsState *s = pdu->s; 190460ce86c7SWei Liu 190560ce86c7SWei Liu /* 190660ce86c7SWei Liu * iounit should be multiples of f_bsize (host filesystem block size 190760ce86c7SWei Liu * and as well as less than (client msize - P9_IOHDRSZ)) 190860ce86c7SWei Liu */ 190960ce86c7SWei Liu if (!v9fs_co_statfs(pdu, path, &stbuf)) { 191068d654daSDan Schatzberg if (stbuf.f_bsize) { 191160ce86c7SWei Liu iounit = stbuf.f_bsize; 191260ce86c7SWei Liu iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; 191360ce86c7SWei Liu } 191468d654daSDan Schatzberg } 191560ce86c7SWei Liu if (!iounit) { 191660ce86c7SWei Liu iounit = s->msize - P9_IOHDRSZ; 191760ce86c7SWei Liu } 191860ce86c7SWei Liu return iounit; 191960ce86c7SWei Liu } 192060ce86c7SWei Liu 19218440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 192260ce86c7SWei Liu { 192360ce86c7SWei Liu int flags; 192460ce86c7SWei Liu int32_t fid; 192560ce86c7SWei Liu int32_t mode; 192660ce86c7SWei Liu V9fsQID qid; 192760ce86c7SWei Liu int iounit = 0; 192860ce86c7SWei Liu ssize_t err = 0; 192960ce86c7SWei Liu size_t offset = 7; 193060ce86c7SWei Liu struct stat stbuf; 193160ce86c7SWei Liu V9fsFidState *fidp; 193260ce86c7SWei Liu V9fsPDU *pdu = opaque; 193360ce86c7SWei Liu V9fsState *s = pdu->s; 193460ce86c7SWei Liu 193560ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 193660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 193760ce86c7SWei Liu } else { 193860ce86c7SWei Liu uint8_t modebyte; 193960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 194060ce86c7SWei Liu mode = modebyte; 194160ce86c7SWei Liu } 194260ce86c7SWei Liu if (err < 0) { 194360ce86c7SWei Liu goto out_nofid; 194460ce86c7SWei Liu } 194560ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 194660ce86c7SWei Liu 194760ce86c7SWei Liu fidp = get_fid(pdu, fid); 194860ce86c7SWei Liu if (fidp == NULL) { 194960ce86c7SWei Liu err = -ENOENT; 195060ce86c7SWei Liu goto out_nofid; 195160ce86c7SWei Liu } 195249dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 195349dd946bSGreg Kurz err = -EINVAL; 195449dd946bSGreg Kurz goto out; 195549dd946bSGreg Kurz } 195660ce86c7SWei Liu 195760ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 195860ce86c7SWei Liu if (err < 0) { 195960ce86c7SWei Liu goto out; 196060ce86c7SWei Liu } 19613b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19623b5ee9e8SAntonios Motakis if (err < 0) { 19633b5ee9e8SAntonios Motakis goto out; 19643b5ee9e8SAntonios Motakis } 196560ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 196660ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 196760ce86c7SWei Liu if (err < 0) { 196860ce86c7SWei Liu goto out; 196960ce86c7SWei Liu } 197060ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 197160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 197260ce86c7SWei Liu if (err < 0) { 197360ce86c7SWei Liu goto out; 197460ce86c7SWei Liu } 197560ce86c7SWei Liu err += offset; 197660ce86c7SWei Liu } else { 197760ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 197860ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 197960ce86c7SWei Liu } else { 198060ce86c7SWei Liu flags = omode_to_uflags(mode); 198160ce86c7SWei Liu } 198260ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 198360ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 198460ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 198560ce86c7SWei Liu err = -EROFS; 198660ce86c7SWei Liu goto out; 198760ce86c7SWei Liu } 198860ce86c7SWei Liu } 198960ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 199060ce86c7SWei Liu if (err < 0) { 199160ce86c7SWei Liu goto out; 199260ce86c7SWei Liu } 199360ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 199460ce86c7SWei Liu fidp->open_flags = flags; 199560ce86c7SWei Liu if (flags & O_EXCL) { 199660ce86c7SWei Liu /* 199760ce86c7SWei Liu * We let the host file system do O_EXCL check 199860ce86c7SWei Liu * We should not reclaim such fd 199960ce86c7SWei Liu */ 200060ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 200160ce86c7SWei Liu } 200260ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 200360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 200460ce86c7SWei Liu if (err < 0) { 200560ce86c7SWei Liu goto out; 200660ce86c7SWei Liu } 200760ce86c7SWei Liu err += offset; 200860ce86c7SWei Liu } 200960ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 201060ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 201160ce86c7SWei Liu out: 201260ce86c7SWei Liu put_fid(pdu, fidp); 201360ce86c7SWei Liu out_nofid: 201460ce86c7SWei Liu pdu_complete(pdu, err); 201560ce86c7SWei Liu } 201660ce86c7SWei Liu 20178440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 201860ce86c7SWei Liu { 201960ce86c7SWei Liu int32_t dfid, flags, mode; 202060ce86c7SWei Liu gid_t gid; 202160ce86c7SWei Liu ssize_t err = 0; 202260ce86c7SWei Liu ssize_t offset = 7; 202360ce86c7SWei Liu V9fsString name; 202460ce86c7SWei Liu V9fsFidState *fidp; 202560ce86c7SWei Liu struct stat stbuf; 202660ce86c7SWei Liu V9fsQID qid; 202760ce86c7SWei Liu int32_t iounit; 202860ce86c7SWei Liu V9fsPDU *pdu = opaque; 202960ce86c7SWei Liu 203060ce86c7SWei Liu v9fs_string_init(&name); 203160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 203260ce86c7SWei Liu &name, &flags, &mode, &gid); 203360ce86c7SWei Liu if (err < 0) { 203460ce86c7SWei Liu goto out_nofid; 203560ce86c7SWei Liu } 203660ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 203760ce86c7SWei Liu 2038fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2039fff39a7aSGreg Kurz err = -ENOENT; 2040fff39a7aSGreg Kurz goto out_nofid; 2041fff39a7aSGreg Kurz } 2042fff39a7aSGreg Kurz 2043805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2044805b5d98SGreg Kurz err = -EEXIST; 2045805b5d98SGreg Kurz goto out_nofid; 2046805b5d98SGreg Kurz } 2047805b5d98SGreg Kurz 204860ce86c7SWei Liu fidp = get_fid(pdu, dfid); 204960ce86c7SWei Liu if (fidp == NULL) { 205060ce86c7SWei Liu err = -ENOENT; 205160ce86c7SWei Liu goto out_nofid; 205260ce86c7SWei Liu } 2053d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2054d63fb193SLi Qiang err = -EINVAL; 2055d63fb193SLi Qiang goto out; 2056d63fb193SLi Qiang } 205760ce86c7SWei Liu 205860ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 205960ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 206060ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 206160ce86c7SWei Liu if (err < 0) { 206260ce86c7SWei Liu goto out; 206360ce86c7SWei Liu } 206460ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 206560ce86c7SWei Liu fidp->open_flags = flags; 206660ce86c7SWei Liu if (flags & O_EXCL) { 206760ce86c7SWei Liu /* 206860ce86c7SWei Liu * We let the host file system do O_EXCL check 206960ce86c7SWei Liu * We should not reclaim such fd 207060ce86c7SWei Liu */ 207160ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 207260ce86c7SWei Liu } 207360ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20743b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20753b5ee9e8SAntonios Motakis if (err < 0) { 20763b5ee9e8SAntonios Motakis goto out; 20773b5ee9e8SAntonios Motakis } 207860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 207960ce86c7SWei Liu if (err < 0) { 208060ce86c7SWei Liu goto out; 208160ce86c7SWei Liu } 208260ce86c7SWei Liu err += offset; 208360ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 208460ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 208560ce86c7SWei Liu out: 208660ce86c7SWei Liu put_fid(pdu, fidp); 208760ce86c7SWei Liu out_nofid: 208860ce86c7SWei Liu pdu_complete(pdu, err); 208960ce86c7SWei Liu v9fs_string_free(&name); 209060ce86c7SWei Liu } 209160ce86c7SWei Liu 2092a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 209360ce86c7SWei Liu { 209460ce86c7SWei Liu int err; 209560ce86c7SWei Liu int32_t fid; 209660ce86c7SWei Liu int datasync; 209760ce86c7SWei Liu size_t offset = 7; 209860ce86c7SWei Liu V9fsFidState *fidp; 209960ce86c7SWei Liu V9fsPDU *pdu = opaque; 210060ce86c7SWei Liu 210160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 210260ce86c7SWei Liu if (err < 0) { 210360ce86c7SWei Liu goto out_nofid; 210460ce86c7SWei Liu } 210560ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 210660ce86c7SWei Liu 210760ce86c7SWei Liu fidp = get_fid(pdu, fid); 210860ce86c7SWei Liu if (fidp == NULL) { 210960ce86c7SWei Liu err = -ENOENT; 211060ce86c7SWei Liu goto out_nofid; 211160ce86c7SWei Liu } 211260ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 211360ce86c7SWei Liu if (!err) { 211460ce86c7SWei Liu err = offset; 211560ce86c7SWei Liu } 211660ce86c7SWei Liu put_fid(pdu, fidp); 211760ce86c7SWei Liu out_nofid: 211860ce86c7SWei Liu pdu_complete(pdu, err); 211960ce86c7SWei Liu } 212060ce86c7SWei Liu 21218440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 212260ce86c7SWei Liu { 212360ce86c7SWei Liu int err; 212460ce86c7SWei Liu int32_t fid; 212560ce86c7SWei Liu size_t offset = 7; 212660ce86c7SWei Liu V9fsFidState *fidp; 212760ce86c7SWei Liu V9fsPDU *pdu = opaque; 212860ce86c7SWei Liu V9fsState *s = pdu->s; 212960ce86c7SWei Liu 213060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 213160ce86c7SWei Liu if (err < 0) { 213260ce86c7SWei Liu goto out_nofid; 213360ce86c7SWei Liu } 213460ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 213560ce86c7SWei Liu 213660ce86c7SWei Liu fidp = clunk_fid(s, fid); 213760ce86c7SWei Liu if (fidp == NULL) { 213860ce86c7SWei Liu err = -ENOENT; 213960ce86c7SWei Liu goto out_nofid; 214060ce86c7SWei Liu } 214160ce86c7SWei Liu /* 214260ce86c7SWei Liu * Bump the ref so that put_fid will 214360ce86c7SWei Liu * free the fid. 214460ce86c7SWei Liu */ 214560ce86c7SWei Liu fidp->ref++; 214660ce86c7SWei Liu err = put_fid(pdu, fidp); 214760ce86c7SWei Liu if (!err) { 214860ce86c7SWei Liu err = offset; 214960ce86c7SWei Liu } 215060ce86c7SWei Liu out_nofid: 215160ce86c7SWei Liu pdu_complete(pdu, err); 215260ce86c7SWei Liu } 215360ce86c7SWei Liu 2154bcb8998fSStefano Stabellini /* 2155bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2156bcb8998fSStefano Stabellini * 2157bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2158bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2159bcb8998fSStefano Stabellini * @size: number of bytes to include 2160bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2161bcb8998fSStefano Stabellini * 2162bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2163bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2164bcb8998fSStefano Stabellini */ 2165bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2166cf45183bSStefano Stabellini size_t skip, size_t size, 2167bcb8998fSStefano Stabellini bool is_write) 2168bcb8998fSStefano Stabellini { 2169bcb8998fSStefano Stabellini QEMUIOVector elem; 2170bcb8998fSStefano Stabellini struct iovec *iov; 2171bcb8998fSStefano Stabellini unsigned int niov; 2172bcb8998fSStefano Stabellini 217388da0b03SStefano Stabellini if (is_write) { 2174cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 217588da0b03SStefano Stabellini } else { 2176cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 217788da0b03SStefano Stabellini } 2178bcb8998fSStefano Stabellini 2179bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2180bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2181cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2182bcb8998fSStefano Stabellini } 2183bcb8998fSStefano Stabellini 218460ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 218560ce86c7SWei Liu uint64_t off, uint32_t max_count) 218660ce86c7SWei Liu { 218760ce86c7SWei Liu ssize_t err; 218860ce86c7SWei Liu size_t offset = 7; 2189cf45183bSStefano Stabellini uint64_t read_count; 2190bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 219160ce86c7SWei Liu 21927e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21937e55d65cSLi Qiang read_count = 0; 219416724a17SGreg Kurz } else { 2195cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2196cf45183bSStefano Stabellini } 2197cf45183bSStefano Stabellini if (read_count > max_count) { 219860ce86c7SWei Liu read_count = max_count; 219960ce86c7SWei Liu } 220060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 220160ce86c7SWei Liu if (err < 0) { 220260ce86c7SWei Liu return err; 220360ce86c7SWei Liu } 220460ce86c7SWei Liu offset += err; 220500588a0aSWei Liu 2206cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2207fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 220860ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 220960ce86c7SWei Liu read_count); 2210bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 221160ce86c7SWei Liu if (err < 0) { 221260ce86c7SWei Liu return err; 221360ce86c7SWei Liu } 221460ce86c7SWei Liu offset += err; 221560ce86c7SWei Liu return offset; 221660ce86c7SWei Liu } 221760ce86c7SWei Liu 22188440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 22198440e22eSGreg Kurz V9fsFidState *fidp, 22208440e22eSGreg Kurz uint32_t max_count) 222160ce86c7SWei Liu { 222260ce86c7SWei Liu V9fsPath path; 222360ce86c7SWei Liu V9fsStat v9stat; 222460ce86c7SWei Liu int len, err = 0; 222560ce86c7SWei Liu int32_t count = 0; 222660ce86c7SWei Liu struct stat stbuf; 222760ce86c7SWei Liu off_t saved_dir_pos; 2228635324e8SGreg Kurz struct dirent *dent; 222960ce86c7SWei Liu 223060ce86c7SWei Liu /* save the directory position */ 223160ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 223260ce86c7SWei Liu if (saved_dir_pos < 0) { 223360ce86c7SWei Liu return saved_dir_pos; 223460ce86c7SWei Liu } 223560ce86c7SWei Liu 223660ce86c7SWei Liu while (1) { 223760ce86c7SWei Liu v9fs_path_init(&path); 22387cde47d4SGreg Kurz 22397cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 22407cde47d4SGreg Kurz 2241635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2242635324e8SGreg Kurz if (err || !dent) { 224360ce86c7SWei Liu break; 224460ce86c7SWei Liu } 224560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 224660ce86c7SWei Liu if (err < 0) { 22478762a46dSGreg Kurz break; 224860ce86c7SWei Liu } 224960ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 225060ce86c7SWei Liu if (err < 0) { 22518762a46dSGreg Kurz break; 225260ce86c7SWei Liu } 22536069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 225460ce86c7SWei Liu if (err < 0) { 22558762a46dSGreg Kurz break; 225660ce86c7SWei Liu } 2257772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 22587cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22597cde47d4SGreg Kurz 226060ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 226160ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 226260ce86c7SWei Liu v9fs_stat_free(&v9stat); 226360ce86c7SWei Liu v9fs_path_free(&path); 226460ce86c7SWei Liu return count; 226560ce86c7SWei Liu } 2266772a7369SJan Dakinevich 2267772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2268772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2269772a7369SJan Dakinevich 2270772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2271772a7369SJan Dakinevich 2272772a7369SJan Dakinevich if (len < 0) { 2273772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2274772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2275772a7369SJan Dakinevich v9fs_path_free(&path); 2276772a7369SJan Dakinevich return len; 2277772a7369SJan Dakinevich } 227860ce86c7SWei Liu count += len; 227960ce86c7SWei Liu v9fs_stat_free(&v9stat); 228060ce86c7SWei Liu v9fs_path_free(&path); 228160ce86c7SWei Liu saved_dir_pos = dent->d_off; 228260ce86c7SWei Liu } 22838762a46dSGreg Kurz 22847cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22857cde47d4SGreg Kurz 228660ce86c7SWei Liu v9fs_path_free(&path); 228760ce86c7SWei Liu if (err < 0) { 228860ce86c7SWei Liu return err; 228960ce86c7SWei Liu } 229060ce86c7SWei Liu return count; 229160ce86c7SWei Liu } 229260ce86c7SWei Liu 22938440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 229460ce86c7SWei Liu { 229560ce86c7SWei Liu int32_t fid; 229660ce86c7SWei Liu uint64_t off; 229760ce86c7SWei Liu ssize_t err = 0; 229860ce86c7SWei Liu int32_t count = 0; 229960ce86c7SWei Liu size_t offset = 7; 230060ce86c7SWei Liu uint32_t max_count; 230160ce86c7SWei Liu V9fsFidState *fidp; 230260ce86c7SWei Liu V9fsPDU *pdu = opaque; 230360ce86c7SWei Liu V9fsState *s = pdu->s; 230460ce86c7SWei Liu 230560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 230660ce86c7SWei Liu if (err < 0) { 230760ce86c7SWei Liu goto out_nofid; 230860ce86c7SWei Liu } 230960ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 231060ce86c7SWei Liu 231160ce86c7SWei Liu fidp = get_fid(pdu, fid); 231260ce86c7SWei Liu if (fidp == NULL) { 231360ce86c7SWei Liu err = -EINVAL; 231460ce86c7SWei Liu goto out_nofid; 231560ce86c7SWei Liu } 231660ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2317d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2318d2c5cf7cSChristian Schoenebeck warn_report_once( 2319d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2320d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2321d2c5cf7cSChristian Schoenebeck ); 2322d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2323d2c5cf7cSChristian Schoenebeck goto out; 2324d2c5cf7cSChristian Schoenebeck } 232560ce86c7SWei Liu if (off == 0) { 232660ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 232760ce86c7SWei Liu } 232860ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 232960ce86c7SWei Liu if (count < 0) { 233060ce86c7SWei Liu err = count; 233160ce86c7SWei Liu goto out; 233260ce86c7SWei Liu } 233360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 233460ce86c7SWei Liu if (err < 0) { 233560ce86c7SWei Liu goto out; 233660ce86c7SWei Liu } 233760ce86c7SWei Liu err += offset + count; 233860ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 233960ce86c7SWei Liu QEMUIOVector qiov_full; 234060ce86c7SWei Liu QEMUIOVector qiov; 234160ce86c7SWei Liu int32_t len; 234260ce86c7SWei Liu 2343cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 234460ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 234560ce86c7SWei Liu do { 234660ce86c7SWei Liu qemu_iovec_reset(&qiov); 234760ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 234860ce86c7SWei Liu if (0) { 234960ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 235060ce86c7SWei Liu } 235160ce86c7SWei Liu /* Loop in case of EINTR */ 235260ce86c7SWei Liu do { 235360ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 235460ce86c7SWei Liu if (len >= 0) { 235560ce86c7SWei Liu off += len; 235660ce86c7SWei Liu count += len; 235760ce86c7SWei Liu } 235860ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 235960ce86c7SWei Liu if (len < 0) { 236060ce86c7SWei Liu /* IO error return the error */ 236160ce86c7SWei Liu err = len; 2362e95c9a49SLi Qiang goto out_free_iovec; 236360ce86c7SWei Liu } 236460ce86c7SWei Liu } while (count < max_count && len > 0); 236560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 236660ce86c7SWei Liu if (err < 0) { 2367e95c9a49SLi Qiang goto out_free_iovec; 236860ce86c7SWei Liu } 236960ce86c7SWei Liu err += offset + count; 2370e95c9a49SLi Qiang out_free_iovec: 237160ce86c7SWei Liu qemu_iovec_destroy(&qiov); 237260ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 237360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 237460ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 237560ce86c7SWei Liu } else { 237660ce86c7SWei Liu err = -EINVAL; 237760ce86c7SWei Liu } 237860ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 237960ce86c7SWei Liu out: 238060ce86c7SWei Liu put_fid(pdu, fidp); 238160ce86c7SWei Liu out_nofid: 238260ce86c7SWei Liu pdu_complete(pdu, err); 238360ce86c7SWei Liu } 238460ce86c7SWei Liu 238529c9d2caSChristian Schoenebeck /** 238629c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 238729c9d2caSChristian Schoenebeck * 238829c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 238929c9d2caSChristian Schoenebeck * @returns required size in bytes 239029c9d2caSChristian Schoenebeck */ 239129c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 239260ce86c7SWei Liu { 239360ce86c7SWei Liu /* 239460ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 239560ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 239660ce86c7SWei Liu */ 239760ce86c7SWei Liu return 24 + v9fs_string_size(name); 239860ce86c7SWei Liu } 239960ce86c7SWei Liu 24000c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 24010c4356baSChristian Schoenebeck { 24020c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 24030c4356baSChristian Schoenebeck 24040c4356baSChristian Schoenebeck for (; e; e = next) { 24050c4356baSChristian Schoenebeck next = e->next; 24060c4356baSChristian Schoenebeck g_free(e->dent); 24070c4356baSChristian Schoenebeck g_free(e->st); 24080c4356baSChristian Schoenebeck g_free(e); 24090c4356baSChristian Schoenebeck } 24100c4356baSChristian Schoenebeck } 24110c4356baSChristian Schoenebeck 24128440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 24130c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 241460ce86c7SWei Liu { 241560ce86c7SWei Liu size_t size; 241660ce86c7SWei Liu V9fsQID qid; 241760ce86c7SWei Liu V9fsString name; 241860ce86c7SWei Liu int len, err = 0; 241960ce86c7SWei Liu int32_t count = 0; 2420635324e8SGreg Kurz struct dirent *dent; 24210c4356baSChristian Schoenebeck struct stat *st; 24220c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 242360ce86c7SWei Liu 24240c4356baSChristian Schoenebeck /* 24250c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 24260c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 24270c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 24280c4356baSChristian Schoenebeck */ 24290c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 24300c4356baSChristian Schoenebeck 24310c4356baSChristian Schoenebeck /* 24320c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 24330c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 24340c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 24350c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 24360c4356baSChristian Schoenebeck */ 24370c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 24380c4356baSChristian Schoenebeck dostat); 24390c4356baSChristian Schoenebeck if (count < 0) { 24400c4356baSChristian Schoenebeck err = count; 24410c4356baSChristian Schoenebeck count = 0; 24420c4356baSChristian Schoenebeck goto out; 244360ce86c7SWei Liu } 24440c4356baSChristian Schoenebeck count = 0; 244560ce86c7SWei Liu 24460c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 24470c4356baSChristian Schoenebeck dent = e->dent; 24481a6ed33cSAntonios Motakis 24491a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 24500c4356baSChristian Schoenebeck st = e->st; 24510c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 24520c4356baSChristian Schoenebeck if (!st) { 24530c4356baSChristian Schoenebeck err = -1; 24540c4356baSChristian Schoenebeck break; 24550c4356baSChristian Schoenebeck } 24560c4356baSChristian Schoenebeck 24570c4356baSChristian Schoenebeck /* remap inode */ 24580c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 24591a6ed33cSAntonios Motakis if (err < 0) { 24600c4356baSChristian Schoenebeck break; 24611a6ed33cSAntonios Motakis } 24621a6ed33cSAntonios Motakis } else { 246360ce86c7SWei Liu /* 246460ce86c7SWei Liu * Fill up just the path field of qid because the client uses 246560ce86c7SWei Liu * only that. To fill the entire qid structure we will have 24661a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 24670c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 24681a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 24691a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 24701a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 24711a6ed33cSAntonios Motakis * files/dirs through other ways. 247260ce86c7SWei Liu */ 247360ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 247460ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 247560ce86c7SWei Liu /* Fill the other fields with dummy values */ 247660ce86c7SWei Liu qid.type = 0; 247760ce86c7SWei Liu qid.version = 0; 24781a6ed33cSAntonios Motakis } 247960ce86c7SWei Liu 24800c4356baSChristian Schoenebeck v9fs_string_init(&name); 24810c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24820c4356baSChristian Schoenebeck 248360ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 248460ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 248560ce86c7SWei Liu &qid, dent->d_off, 248660ce86c7SWei Liu dent->d_type, &name); 24877cde47d4SGreg Kurz 24880c4356baSChristian Schoenebeck v9fs_string_free(&name); 24897cde47d4SGreg Kurz 249060ce86c7SWei Liu if (len < 0) { 24910c4356baSChristian Schoenebeck err = len; 24920c4356baSChristian Schoenebeck break; 249360ce86c7SWei Liu } 24940c4356baSChristian Schoenebeck 249560ce86c7SWei Liu count += len; 249660ce86c7SWei Liu } 24977cde47d4SGreg Kurz 24980c4356baSChristian Schoenebeck out: 24990c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 250060ce86c7SWei Liu if (err < 0) { 250160ce86c7SWei Liu return err; 250260ce86c7SWei Liu } 250360ce86c7SWei Liu return count; 250460ce86c7SWei Liu } 250560ce86c7SWei Liu 25068440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 250760ce86c7SWei Liu { 250860ce86c7SWei Liu int32_t fid; 250960ce86c7SWei Liu V9fsFidState *fidp; 251060ce86c7SWei Liu ssize_t retval = 0; 251160ce86c7SWei Liu size_t offset = 7; 251260ce86c7SWei Liu uint64_t initial_offset; 251360ce86c7SWei Liu int32_t count; 251460ce86c7SWei Liu uint32_t max_count; 251560ce86c7SWei Liu V9fsPDU *pdu = opaque; 2516d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 251760ce86c7SWei Liu 251860ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 251960ce86c7SWei Liu &initial_offset, &max_count); 252060ce86c7SWei Liu if (retval < 0) { 252160ce86c7SWei Liu goto out_nofid; 252260ce86c7SWei Liu } 252360ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 252460ce86c7SWei Liu 2525d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2526d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2527d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2528d36a5c22SChristian Schoenebeck warn_report_once( 2529d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2530d36a5c22SChristian Schoenebeck ); 2531d36a5c22SChristian Schoenebeck } 2532d36a5c22SChristian Schoenebeck 253360ce86c7SWei Liu fidp = get_fid(pdu, fid); 253460ce86c7SWei Liu if (fidp == NULL) { 253560ce86c7SWei Liu retval = -EINVAL; 253660ce86c7SWei Liu goto out_nofid; 253760ce86c7SWei Liu } 2538f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 253960ce86c7SWei Liu retval = -EINVAL; 254060ce86c7SWei Liu goto out; 254160ce86c7SWei Liu } 2542d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2543d2c5cf7cSChristian Schoenebeck warn_report_once( 2544d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2545d2c5cf7cSChristian Schoenebeck "protocol version" 2546d2c5cf7cSChristian Schoenebeck ); 2547d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2548d2c5cf7cSChristian Schoenebeck goto out; 2549d2c5cf7cSChristian Schoenebeck } 25500c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 255160ce86c7SWei Liu if (count < 0) { 255260ce86c7SWei Liu retval = count; 255360ce86c7SWei Liu goto out; 255460ce86c7SWei Liu } 255560ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 255660ce86c7SWei Liu if (retval < 0) { 255760ce86c7SWei Liu goto out; 255860ce86c7SWei Liu } 255960ce86c7SWei Liu retval += count + offset; 256060ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 256160ce86c7SWei Liu out: 256260ce86c7SWei Liu put_fid(pdu, fidp); 256360ce86c7SWei Liu out_nofid: 256460ce86c7SWei Liu pdu_complete(pdu, retval); 256560ce86c7SWei Liu } 256660ce86c7SWei Liu 256760ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 256860ce86c7SWei Liu uint64_t off, uint32_t count, 256960ce86c7SWei Liu struct iovec *sg, int cnt) 257060ce86c7SWei Liu { 257160ce86c7SWei Liu int i, to_copy; 257260ce86c7SWei Liu ssize_t err = 0; 25737e55d65cSLi Qiang uint64_t write_count; 257460ce86c7SWei Liu size_t offset = 7; 257560ce86c7SWei Liu 257660ce86c7SWei Liu 25777e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2578b858e80aSDaniel Henrique Barboza return -ENOSPC; 257960ce86c7SWei Liu } 25807e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 25817e55d65cSLi Qiang if (write_count > count) { 25827e55d65cSLi Qiang write_count = count; 25837e55d65cSLi Qiang } 258460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 258560ce86c7SWei Liu if (err < 0) { 258660ce86c7SWei Liu return err; 258760ce86c7SWei Liu } 258860ce86c7SWei Liu err += offset; 258960ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 259060ce86c7SWei Liu /* 259160ce86c7SWei Liu * Now copy the content from sg list 259260ce86c7SWei Liu */ 259360ce86c7SWei Liu for (i = 0; i < cnt; i++) { 259460ce86c7SWei Liu if (write_count > sg[i].iov_len) { 259560ce86c7SWei Liu to_copy = sg[i].iov_len; 259660ce86c7SWei Liu } else { 259760ce86c7SWei Liu to_copy = write_count; 259860ce86c7SWei Liu } 259960ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 260060ce86c7SWei Liu /* updating vs->off since we are not using below */ 260160ce86c7SWei Liu off += to_copy; 260260ce86c7SWei Liu write_count -= to_copy; 260360ce86c7SWei Liu } 2604b858e80aSDaniel Henrique Barboza 260560ce86c7SWei Liu return err; 260660ce86c7SWei Liu } 260760ce86c7SWei Liu 26088440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 260960ce86c7SWei Liu { 261060ce86c7SWei Liu ssize_t err; 261160ce86c7SWei Liu int32_t fid; 261260ce86c7SWei Liu uint64_t off; 261360ce86c7SWei Liu uint32_t count; 261460ce86c7SWei Liu int32_t len = 0; 261560ce86c7SWei Liu int32_t total = 0; 261660ce86c7SWei Liu size_t offset = 7; 261760ce86c7SWei Liu V9fsFidState *fidp; 261860ce86c7SWei Liu V9fsPDU *pdu = opaque; 261960ce86c7SWei Liu V9fsState *s = pdu->s; 262060ce86c7SWei Liu QEMUIOVector qiov_full; 262160ce86c7SWei Liu QEMUIOVector qiov; 262260ce86c7SWei Liu 262360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 262460ce86c7SWei Liu if (err < 0) { 262560ce86c7SWei Liu pdu_complete(pdu, err); 262660ce86c7SWei Liu return; 262760ce86c7SWei Liu } 262860ce86c7SWei Liu offset += err; 2629cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 263060ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 263160ce86c7SWei Liu 263260ce86c7SWei Liu fidp = get_fid(pdu, fid); 263360ce86c7SWei Liu if (fidp == NULL) { 263460ce86c7SWei Liu err = -EINVAL; 263560ce86c7SWei Liu goto out_nofid; 263660ce86c7SWei Liu } 263760ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 263860ce86c7SWei Liu if (fidp->fs.fd == -1) { 263960ce86c7SWei Liu err = -EINVAL; 264060ce86c7SWei Liu goto out; 264160ce86c7SWei Liu } 264260ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 264360ce86c7SWei Liu /* 264460ce86c7SWei Liu * setxattr operation 264560ce86c7SWei Liu */ 264660ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 264760ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 264860ce86c7SWei Liu goto out; 264960ce86c7SWei Liu } else { 265060ce86c7SWei Liu err = -EINVAL; 265160ce86c7SWei Liu goto out; 265260ce86c7SWei Liu } 265360ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 265460ce86c7SWei Liu do { 265560ce86c7SWei Liu qemu_iovec_reset(&qiov); 265660ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 265760ce86c7SWei Liu if (0) { 265860ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 265960ce86c7SWei Liu } 266060ce86c7SWei Liu /* Loop in case of EINTR */ 266160ce86c7SWei Liu do { 266260ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 266360ce86c7SWei Liu if (len >= 0) { 266460ce86c7SWei Liu off += len; 266560ce86c7SWei Liu total += len; 266660ce86c7SWei Liu } 266760ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 266860ce86c7SWei Liu if (len < 0) { 266960ce86c7SWei Liu /* IO error return the error */ 267060ce86c7SWei Liu err = len; 267160ce86c7SWei Liu goto out_qiov; 267260ce86c7SWei Liu } 267360ce86c7SWei Liu } while (total < count && len > 0); 267460ce86c7SWei Liu 267560ce86c7SWei Liu offset = 7; 267660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 267760ce86c7SWei Liu if (err < 0) { 2678fdfcc9aeSLi Qiang goto out_qiov; 267960ce86c7SWei Liu } 268060ce86c7SWei Liu err += offset; 268160ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 268260ce86c7SWei Liu out_qiov: 268360ce86c7SWei Liu qemu_iovec_destroy(&qiov); 268460ce86c7SWei Liu out: 268560ce86c7SWei Liu put_fid(pdu, fidp); 268660ce86c7SWei Liu out_nofid: 268760ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 268860ce86c7SWei Liu pdu_complete(pdu, err); 268960ce86c7SWei Liu } 269060ce86c7SWei Liu 26918440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 269260ce86c7SWei Liu { 269360ce86c7SWei Liu int32_t fid; 269460ce86c7SWei Liu int err = 0; 269560ce86c7SWei Liu size_t offset = 7; 269660ce86c7SWei Liu V9fsFidState *fidp; 269760ce86c7SWei Liu V9fsQID qid; 269860ce86c7SWei Liu int32_t perm; 269960ce86c7SWei Liu int8_t mode; 270060ce86c7SWei Liu V9fsPath path; 270160ce86c7SWei Liu struct stat stbuf; 270260ce86c7SWei Liu V9fsString name; 270360ce86c7SWei Liu V9fsString extension; 270460ce86c7SWei Liu int iounit; 270560ce86c7SWei Liu V9fsPDU *pdu = opaque; 27065b3c77aaSGreg Kurz V9fsState *s = pdu->s; 270760ce86c7SWei Liu 270860ce86c7SWei Liu v9fs_path_init(&path); 270960ce86c7SWei Liu v9fs_string_init(&name); 271060ce86c7SWei Liu v9fs_string_init(&extension); 271160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 271260ce86c7SWei Liu &perm, &mode, &extension); 271360ce86c7SWei Liu if (err < 0) { 271460ce86c7SWei Liu goto out_nofid; 271560ce86c7SWei Liu } 271660ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 271760ce86c7SWei Liu 2718fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2719fff39a7aSGreg Kurz err = -ENOENT; 2720fff39a7aSGreg Kurz goto out_nofid; 2721fff39a7aSGreg Kurz } 2722fff39a7aSGreg Kurz 2723805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2724805b5d98SGreg Kurz err = -EEXIST; 2725805b5d98SGreg Kurz goto out_nofid; 2726805b5d98SGreg Kurz } 2727805b5d98SGreg Kurz 272860ce86c7SWei Liu fidp = get_fid(pdu, fid); 272960ce86c7SWei Liu if (fidp == NULL) { 273060ce86c7SWei Liu err = -EINVAL; 273160ce86c7SWei Liu goto out_nofid; 273260ce86c7SWei Liu } 2733d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2734d63fb193SLi Qiang err = -EINVAL; 2735d63fb193SLi Qiang goto out; 2736d63fb193SLi Qiang } 273760ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 273860ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 273960ce86c7SWei Liu fidp->uid, -1, &stbuf); 274060ce86c7SWei Liu if (err < 0) { 274160ce86c7SWei Liu goto out; 274260ce86c7SWei Liu } 274360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 274460ce86c7SWei Liu if (err < 0) { 274560ce86c7SWei Liu goto out; 274660ce86c7SWei Liu } 27475b3c77aaSGreg Kurz v9fs_path_write_lock(s); 274860ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27495b3c77aaSGreg Kurz v9fs_path_unlock(s); 275060ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 275160ce86c7SWei Liu if (err < 0) { 275260ce86c7SWei Liu goto out; 275360ce86c7SWei Liu } 275460ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 275560ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 275660ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 275760ce86c7SWei Liu extension.data, -1 , &stbuf); 275860ce86c7SWei Liu if (err < 0) { 275960ce86c7SWei Liu goto out; 276060ce86c7SWei Liu } 276160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 276260ce86c7SWei Liu if (err < 0) { 276360ce86c7SWei Liu goto out; 276460ce86c7SWei Liu } 27655b3c77aaSGreg Kurz v9fs_path_write_lock(s); 276660ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27675b3c77aaSGreg Kurz v9fs_path_unlock(s); 276860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 276960ce86c7SWei Liu int32_t ofid = atoi(extension.data); 277060ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 277160ce86c7SWei Liu if (ofidp == NULL) { 277260ce86c7SWei Liu err = -EINVAL; 277360ce86c7SWei Liu goto out; 277460ce86c7SWei Liu } 277560ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 277660ce86c7SWei Liu put_fid(pdu, ofidp); 277760ce86c7SWei Liu if (err < 0) { 277860ce86c7SWei Liu goto out; 277960ce86c7SWei Liu } 278060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 278160ce86c7SWei Liu if (err < 0) { 278260ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 278360ce86c7SWei Liu goto out; 278460ce86c7SWei Liu } 27855b3c77aaSGreg Kurz v9fs_path_write_lock(s); 278660ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27875b3c77aaSGreg Kurz v9fs_path_unlock(s); 278860ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 278960ce86c7SWei Liu if (err < 0) { 279060ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 279160ce86c7SWei Liu goto out; 279260ce86c7SWei Liu } 279360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 279460ce86c7SWei Liu char ctype; 279560ce86c7SWei Liu uint32_t major, minor; 279660ce86c7SWei Liu mode_t nmode = 0; 279760ce86c7SWei Liu 279860ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 279960ce86c7SWei Liu err = -errno; 280060ce86c7SWei Liu goto out; 280160ce86c7SWei Liu } 280260ce86c7SWei Liu 280360ce86c7SWei Liu switch (ctype) { 280460ce86c7SWei Liu case 'c': 280560ce86c7SWei Liu nmode = S_IFCHR; 280660ce86c7SWei Liu break; 280760ce86c7SWei Liu case 'b': 280860ce86c7SWei Liu nmode = S_IFBLK; 280960ce86c7SWei Liu break; 281060ce86c7SWei Liu default: 281160ce86c7SWei Liu err = -EIO; 281260ce86c7SWei Liu goto out; 281360ce86c7SWei Liu } 281460ce86c7SWei Liu 281560ce86c7SWei Liu nmode |= perm & 0777; 281660ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 281760ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 281860ce86c7SWei Liu if (err < 0) { 281960ce86c7SWei Liu goto out; 282060ce86c7SWei Liu } 282160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 282260ce86c7SWei Liu if (err < 0) { 282360ce86c7SWei Liu goto out; 282460ce86c7SWei Liu } 28255b3c77aaSGreg Kurz v9fs_path_write_lock(s); 282660ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28275b3c77aaSGreg Kurz v9fs_path_unlock(s); 282860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 282960ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 283060ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 283160ce86c7SWei Liu if (err < 0) { 283260ce86c7SWei Liu goto out; 283360ce86c7SWei Liu } 283460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 283560ce86c7SWei Liu if (err < 0) { 283660ce86c7SWei Liu goto out; 283760ce86c7SWei Liu } 28385b3c77aaSGreg Kurz v9fs_path_write_lock(s); 283960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28405b3c77aaSGreg Kurz v9fs_path_unlock(s); 284160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 284260ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 284360ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 284460ce86c7SWei Liu if (err < 0) { 284560ce86c7SWei Liu goto out; 284660ce86c7SWei Liu } 284760ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 284860ce86c7SWei Liu if (err < 0) { 284960ce86c7SWei Liu goto out; 285060ce86c7SWei Liu } 28515b3c77aaSGreg Kurz v9fs_path_write_lock(s); 285260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28535b3c77aaSGreg Kurz v9fs_path_unlock(s); 285460ce86c7SWei Liu } else { 285560ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 285660ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 285760ce86c7SWei Liu if (err < 0) { 285860ce86c7SWei Liu goto out; 285960ce86c7SWei Liu } 286060ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 286160ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 286260ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 286360ce86c7SWei Liu /* 286460ce86c7SWei Liu * We let the host file system do O_EXCL check 286560ce86c7SWei Liu * We should not reclaim such fd 286660ce86c7SWei Liu */ 286760ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 286860ce86c7SWei Liu } 286960ce86c7SWei Liu } 287060ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 28713b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28723b5ee9e8SAntonios Motakis if (err < 0) { 28733b5ee9e8SAntonios Motakis goto out; 28743b5ee9e8SAntonios Motakis } 287560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 287660ce86c7SWei Liu if (err < 0) { 287760ce86c7SWei Liu goto out; 287860ce86c7SWei Liu } 287960ce86c7SWei Liu err += offset; 288060ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 288160ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 288260ce86c7SWei Liu out: 288360ce86c7SWei Liu put_fid(pdu, fidp); 288460ce86c7SWei Liu out_nofid: 288560ce86c7SWei Liu pdu_complete(pdu, err); 288660ce86c7SWei Liu v9fs_string_free(&name); 288760ce86c7SWei Liu v9fs_string_free(&extension); 288860ce86c7SWei Liu v9fs_path_free(&path); 288960ce86c7SWei Liu } 289060ce86c7SWei Liu 28918440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 289260ce86c7SWei Liu { 289360ce86c7SWei Liu V9fsPDU *pdu = opaque; 289460ce86c7SWei Liu V9fsString name; 289560ce86c7SWei Liu V9fsString symname; 289660ce86c7SWei Liu V9fsFidState *dfidp; 289760ce86c7SWei Liu V9fsQID qid; 289860ce86c7SWei Liu struct stat stbuf; 289960ce86c7SWei Liu int32_t dfid; 290060ce86c7SWei Liu int err = 0; 290160ce86c7SWei Liu gid_t gid; 290260ce86c7SWei Liu size_t offset = 7; 290360ce86c7SWei Liu 290460ce86c7SWei Liu v9fs_string_init(&name); 290560ce86c7SWei Liu v9fs_string_init(&symname); 290660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 290760ce86c7SWei Liu if (err < 0) { 290860ce86c7SWei Liu goto out_nofid; 290960ce86c7SWei Liu } 291060ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 291160ce86c7SWei Liu 2912fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2913fff39a7aSGreg Kurz err = -ENOENT; 2914fff39a7aSGreg Kurz goto out_nofid; 2915fff39a7aSGreg Kurz } 2916fff39a7aSGreg Kurz 2917805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2918805b5d98SGreg Kurz err = -EEXIST; 2919805b5d98SGreg Kurz goto out_nofid; 2920805b5d98SGreg Kurz } 2921805b5d98SGreg Kurz 292260ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 292360ce86c7SWei Liu if (dfidp == NULL) { 292460ce86c7SWei Liu err = -EINVAL; 292560ce86c7SWei Liu goto out_nofid; 292660ce86c7SWei Liu } 292760ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 292860ce86c7SWei Liu if (err < 0) { 292960ce86c7SWei Liu goto out; 293060ce86c7SWei Liu } 29313b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 29323b5ee9e8SAntonios Motakis if (err < 0) { 29333b5ee9e8SAntonios Motakis goto out; 29343b5ee9e8SAntonios Motakis } 293560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 293660ce86c7SWei Liu if (err < 0) { 293760ce86c7SWei Liu goto out; 293860ce86c7SWei Liu } 293960ce86c7SWei Liu err += offset; 294060ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 294160ce86c7SWei Liu qid.type, qid.version, qid.path); 294260ce86c7SWei Liu out: 294360ce86c7SWei Liu put_fid(pdu, dfidp); 294460ce86c7SWei Liu out_nofid: 294560ce86c7SWei Liu pdu_complete(pdu, err); 294660ce86c7SWei Liu v9fs_string_free(&name); 294760ce86c7SWei Liu v9fs_string_free(&symname); 294860ce86c7SWei Liu } 294960ce86c7SWei Liu 2950a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 295160ce86c7SWei Liu { 295260ce86c7SWei Liu ssize_t err; 295360ce86c7SWei Liu int16_t tag; 295460ce86c7SWei Liu size_t offset = 7; 2955d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 295660ce86c7SWei Liu V9fsPDU *pdu = opaque; 295760ce86c7SWei Liu V9fsState *s = pdu->s; 295860ce86c7SWei Liu 295960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 296060ce86c7SWei Liu if (err < 0) { 296160ce86c7SWei Liu pdu_complete(pdu, err); 296260ce86c7SWei Liu return; 296360ce86c7SWei Liu } 296460ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 296560ce86c7SWei Liu 2966d5f2af7bSGreg Kurz if (pdu->tag == tag) { 29673dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2968d5f2af7bSGreg Kurz } else { 296960ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 297060ce86c7SWei Liu if (cancel_pdu->tag == tag) { 297160ce86c7SWei Liu break; 297260ce86c7SWei Liu } 297360ce86c7SWei Liu } 2974d5f2af7bSGreg Kurz } 297560ce86c7SWei Liu if (cancel_pdu) { 297660ce86c7SWei Liu cancel_pdu->cancelled = 1; 297760ce86c7SWei Liu /* 297860ce86c7SWei Liu * Wait for pdu to complete. 297960ce86c7SWei Liu */ 29801ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 298118adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 298260ce86c7SWei Liu cancel_pdu->cancelled = 0; 298360ce86c7SWei Liu pdu_free(cancel_pdu); 298460ce86c7SWei Liu } 298518adde86SGreg Kurz } 298660ce86c7SWei Liu pdu_complete(pdu, 7); 298760ce86c7SWei Liu } 298860ce86c7SWei Liu 29898440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 299060ce86c7SWei Liu { 299160ce86c7SWei Liu V9fsPDU *pdu = opaque; 299260ce86c7SWei Liu int32_t dfid, oldfid; 299360ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 299460ce86c7SWei Liu V9fsString name; 299560ce86c7SWei Liu size_t offset = 7; 299660ce86c7SWei Liu int err = 0; 299760ce86c7SWei Liu 299860ce86c7SWei Liu v9fs_string_init(&name); 299960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 300060ce86c7SWei Liu if (err < 0) { 300160ce86c7SWei Liu goto out_nofid; 300260ce86c7SWei Liu } 300360ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 300460ce86c7SWei Liu 3005fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3006fff39a7aSGreg Kurz err = -ENOENT; 3007fff39a7aSGreg Kurz goto out_nofid; 3008fff39a7aSGreg Kurz } 3009fff39a7aSGreg Kurz 3010805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3011805b5d98SGreg Kurz err = -EEXIST; 3012805b5d98SGreg Kurz goto out_nofid; 3013805b5d98SGreg Kurz } 3014805b5d98SGreg Kurz 301560ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 301660ce86c7SWei Liu if (dfidp == NULL) { 301760ce86c7SWei Liu err = -ENOENT; 301860ce86c7SWei Liu goto out_nofid; 301960ce86c7SWei Liu } 302060ce86c7SWei Liu 302160ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 302260ce86c7SWei Liu if (oldfidp == NULL) { 302360ce86c7SWei Liu err = -ENOENT; 302460ce86c7SWei Liu goto out; 302560ce86c7SWei Liu } 302660ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 302760ce86c7SWei Liu if (!err) { 302860ce86c7SWei Liu err = offset; 302960ce86c7SWei Liu } 30304c158678SLi Qiang put_fid(pdu, oldfidp); 303160ce86c7SWei Liu out: 303260ce86c7SWei Liu put_fid(pdu, dfidp); 303360ce86c7SWei Liu out_nofid: 303460ce86c7SWei Liu v9fs_string_free(&name); 303560ce86c7SWei Liu pdu_complete(pdu, err); 303660ce86c7SWei Liu } 303760ce86c7SWei Liu 303860ce86c7SWei Liu /* Only works with path name based fid */ 30398440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 304060ce86c7SWei Liu { 304160ce86c7SWei Liu int32_t fid; 304260ce86c7SWei Liu int err = 0; 304360ce86c7SWei Liu size_t offset = 7; 304460ce86c7SWei Liu V9fsFidState *fidp; 304560ce86c7SWei Liu V9fsPDU *pdu = opaque; 304660ce86c7SWei Liu 304760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 304860ce86c7SWei Liu if (err < 0) { 304960ce86c7SWei Liu goto out_nofid; 305060ce86c7SWei Liu } 305160ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 305260ce86c7SWei Liu 305360ce86c7SWei Liu fidp = get_fid(pdu, fid); 305460ce86c7SWei Liu if (fidp == NULL) { 305560ce86c7SWei Liu err = -EINVAL; 305660ce86c7SWei Liu goto out_nofid; 305760ce86c7SWei Liu } 305860ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 305960ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 306060ce86c7SWei Liu err = -EOPNOTSUPP; 306160ce86c7SWei Liu goto out_err; 306260ce86c7SWei Liu } 306360ce86c7SWei Liu /* 306460ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 306560ce86c7SWei Liu * the file later. So don't reclaim fd 306660ce86c7SWei Liu */ 306760ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 306860ce86c7SWei Liu if (err < 0) { 306960ce86c7SWei Liu goto out_err; 307060ce86c7SWei Liu } 307160ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 307260ce86c7SWei Liu if (!err) { 307360ce86c7SWei Liu err = offset; 307460ce86c7SWei Liu } 307560ce86c7SWei Liu out_err: 307660ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 307760ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 307860ce86c7SWei Liu put_fid(pdu, fidp); 307960ce86c7SWei Liu out_nofid: 308060ce86c7SWei Liu pdu_complete(pdu, err); 308160ce86c7SWei Liu } 308260ce86c7SWei Liu 30838440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 308460ce86c7SWei Liu { 308560ce86c7SWei Liu int err = 0; 308660ce86c7SWei Liu V9fsString name; 308767e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 308860ce86c7SWei Liu size_t offset = 7; 308960ce86c7SWei Liu V9fsPath path; 309060ce86c7SWei Liu V9fsFidState *dfidp; 309160ce86c7SWei Liu V9fsPDU *pdu = opaque; 309260ce86c7SWei Liu 309360ce86c7SWei Liu v9fs_string_init(&name); 309460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 309560ce86c7SWei Liu if (err < 0) { 309660ce86c7SWei Liu goto out_nofid; 309760ce86c7SWei Liu } 3098fff39a7aSGreg Kurz 3099fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3100fff39a7aSGreg Kurz err = -ENOENT; 3101fff39a7aSGreg Kurz goto out_nofid; 3102fff39a7aSGreg Kurz } 3103fff39a7aSGreg Kurz 3104805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3105805b5d98SGreg Kurz err = -EINVAL; 3106805b5d98SGreg Kurz goto out_nofid; 3107805b5d98SGreg Kurz } 3108805b5d98SGreg Kurz 3109805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3110805b5d98SGreg Kurz err = -ENOTEMPTY; 3111805b5d98SGreg Kurz goto out_nofid; 3112805b5d98SGreg Kurz } 3113805b5d98SGreg Kurz 311467e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 311567e87345SKeno Fischer err = -EINVAL; 311667e87345SKeno Fischer goto out_nofid; 311767e87345SKeno Fischer } 311867e87345SKeno Fischer 311967e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 312067e87345SKeno Fischer rflags |= AT_REMOVEDIR; 312167e87345SKeno Fischer } 312267e87345SKeno Fischer 312360ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 312460ce86c7SWei Liu if (dfidp == NULL) { 312560ce86c7SWei Liu err = -EINVAL; 312660ce86c7SWei Liu goto out_nofid; 312760ce86c7SWei Liu } 312860ce86c7SWei Liu /* 312960ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 313060ce86c7SWei Liu * the file later. So don't reclaim fd 313160ce86c7SWei Liu */ 313260ce86c7SWei Liu v9fs_path_init(&path); 313360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 313460ce86c7SWei Liu if (err < 0) { 313560ce86c7SWei Liu goto out_err; 313660ce86c7SWei Liu } 313760ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 313860ce86c7SWei Liu if (err < 0) { 313960ce86c7SWei Liu goto out_err; 314060ce86c7SWei Liu } 314167e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 314260ce86c7SWei Liu if (!err) { 314360ce86c7SWei Liu err = offset; 314460ce86c7SWei Liu } 314560ce86c7SWei Liu out_err: 314660ce86c7SWei Liu put_fid(pdu, dfidp); 314760ce86c7SWei Liu v9fs_path_free(&path); 314860ce86c7SWei Liu out_nofid: 314960ce86c7SWei Liu pdu_complete(pdu, err); 315060ce86c7SWei Liu v9fs_string_free(&name); 315160ce86c7SWei Liu } 315260ce86c7SWei Liu 315360ce86c7SWei Liu 315460ce86c7SWei Liu /* Only works with path name based fid */ 31558440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 31568440e22eSGreg Kurz int32_t newdirfid, 31578440e22eSGreg Kurz V9fsString *name) 315860ce86c7SWei Liu { 315960ce86c7SWei Liu int err = 0; 316060ce86c7SWei Liu V9fsPath new_path; 316160ce86c7SWei Liu V9fsFidState *tfidp; 316260ce86c7SWei Liu V9fsState *s = pdu->s; 316360ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 316460ce86c7SWei Liu 316560ce86c7SWei Liu v9fs_path_init(&new_path); 316660ce86c7SWei Liu if (newdirfid != -1) { 316760ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 316860ce86c7SWei Liu if (dirfidp == NULL) { 3169b858e80aSDaniel Henrique Barboza return -ENOENT; 317060ce86c7SWei Liu } 317149dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 317249dd946bSGreg Kurz err = -EINVAL; 317349dd946bSGreg Kurz goto out; 317449dd946bSGreg Kurz } 31754fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 31764fa62005SGreg Kurz if (err < 0) { 31774fa62005SGreg Kurz goto out; 31784fa62005SGreg Kurz } 317960ce86c7SWei Liu } else { 31804d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31814d8bc733SJan Dakinevich V9fsPath dir_path; 31824d8bc733SJan Dakinevich 31834d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31844d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31854d8bc733SJan Dakinevich g_free(dir_name); 31864d8bc733SJan Dakinevich 31874d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31884d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31894fa62005SGreg Kurz if (err < 0) { 31904fa62005SGreg Kurz goto out; 31914fa62005SGreg Kurz } 319260ce86c7SWei Liu } 319360ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 319460ce86c7SWei Liu if (err < 0) { 319560ce86c7SWei Liu goto out; 319660ce86c7SWei Liu } 319760ce86c7SWei Liu /* 319860ce86c7SWei Liu * Fixup fid's pointing to the old name to 319960ce86c7SWei Liu * start pointing to the new name 320060ce86c7SWei Liu */ 3201feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 320260ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 320360ce86c7SWei Liu /* replace the name */ 320460ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 320560ce86c7SWei Liu } 320660ce86c7SWei Liu } 320760ce86c7SWei Liu out: 320860ce86c7SWei Liu if (dirfidp) { 320960ce86c7SWei Liu put_fid(pdu, dirfidp); 321060ce86c7SWei Liu } 321160ce86c7SWei Liu v9fs_path_free(&new_path); 321260ce86c7SWei Liu return err; 321360ce86c7SWei Liu } 321460ce86c7SWei Liu 321560ce86c7SWei Liu /* Only works with path name based fid */ 32168440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 321760ce86c7SWei Liu { 321860ce86c7SWei Liu int32_t fid; 321960ce86c7SWei Liu ssize_t err = 0; 322060ce86c7SWei Liu size_t offset = 7; 322160ce86c7SWei Liu V9fsString name; 322260ce86c7SWei Liu int32_t newdirfid; 322360ce86c7SWei Liu V9fsFidState *fidp; 322460ce86c7SWei Liu V9fsPDU *pdu = opaque; 322560ce86c7SWei Liu V9fsState *s = pdu->s; 322660ce86c7SWei Liu 322760ce86c7SWei Liu v9fs_string_init(&name); 322860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 322960ce86c7SWei Liu if (err < 0) { 323060ce86c7SWei Liu goto out_nofid; 323160ce86c7SWei Liu } 3232fff39a7aSGreg Kurz 3233fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3234fff39a7aSGreg Kurz err = -ENOENT; 3235fff39a7aSGreg Kurz goto out_nofid; 3236fff39a7aSGreg Kurz } 3237fff39a7aSGreg Kurz 3238805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3239805b5d98SGreg Kurz err = -EISDIR; 3240805b5d98SGreg Kurz goto out_nofid; 3241805b5d98SGreg Kurz } 3242805b5d98SGreg Kurz 324360ce86c7SWei Liu fidp = get_fid(pdu, fid); 324460ce86c7SWei Liu if (fidp == NULL) { 324560ce86c7SWei Liu err = -ENOENT; 324660ce86c7SWei Liu goto out_nofid; 324760ce86c7SWei Liu } 324849dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 324949dd946bSGreg Kurz err = -EINVAL; 325049dd946bSGreg Kurz goto out; 325149dd946bSGreg Kurz } 325260ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 325360ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 325460ce86c7SWei Liu err = -EOPNOTSUPP; 325560ce86c7SWei Liu goto out; 325660ce86c7SWei Liu } 325760ce86c7SWei Liu v9fs_path_write_lock(s); 325860ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 325960ce86c7SWei Liu v9fs_path_unlock(s); 326060ce86c7SWei Liu if (!err) { 326160ce86c7SWei Liu err = offset; 326260ce86c7SWei Liu } 326360ce86c7SWei Liu out: 326460ce86c7SWei Liu put_fid(pdu, fidp); 326560ce86c7SWei Liu out_nofid: 326660ce86c7SWei Liu pdu_complete(pdu, err); 326760ce86c7SWei Liu v9fs_string_free(&name); 326860ce86c7SWei Liu } 326960ce86c7SWei Liu 32704fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 32718440e22eSGreg Kurz V9fsString *old_name, 32728440e22eSGreg Kurz V9fsPath *newdir, 327360ce86c7SWei Liu V9fsString *new_name) 327460ce86c7SWei Liu { 327560ce86c7SWei Liu V9fsFidState *tfidp; 327660ce86c7SWei Liu V9fsPath oldpath, newpath; 327760ce86c7SWei Liu V9fsState *s = pdu->s; 32784fa62005SGreg Kurz int err; 327960ce86c7SWei Liu 328060ce86c7SWei Liu v9fs_path_init(&oldpath); 328160ce86c7SWei Liu v9fs_path_init(&newpath); 32824fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32834fa62005SGreg Kurz if (err < 0) { 32844fa62005SGreg Kurz goto out; 32854fa62005SGreg Kurz } 32864fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32874fa62005SGreg Kurz if (err < 0) { 32884fa62005SGreg Kurz goto out; 32894fa62005SGreg Kurz } 329060ce86c7SWei Liu 329160ce86c7SWei Liu /* 329260ce86c7SWei Liu * Fixup fid's pointing to the old name to 329360ce86c7SWei Liu * start pointing to the new name 329460ce86c7SWei Liu */ 3295feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 329660ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 329760ce86c7SWei Liu /* replace the name */ 329860ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 329960ce86c7SWei Liu } 330060ce86c7SWei Liu } 33014fa62005SGreg Kurz out: 330260ce86c7SWei Liu v9fs_path_free(&oldpath); 330360ce86c7SWei Liu v9fs_path_free(&newpath); 33044fa62005SGreg Kurz return err; 330560ce86c7SWei Liu } 330660ce86c7SWei Liu 33078440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 33088440e22eSGreg Kurz V9fsString *old_name, 33098440e22eSGreg Kurz int32_t newdirfid, 331060ce86c7SWei Liu V9fsString *new_name) 331160ce86c7SWei Liu { 331260ce86c7SWei Liu int err = 0; 331360ce86c7SWei Liu V9fsState *s = pdu->s; 331460ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 331560ce86c7SWei Liu 331660ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 331760ce86c7SWei Liu if (olddirfidp == NULL) { 331860ce86c7SWei Liu err = -ENOENT; 331960ce86c7SWei Liu goto out; 332060ce86c7SWei Liu } 332160ce86c7SWei Liu if (newdirfid != -1) { 332260ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 332360ce86c7SWei Liu if (newdirfidp == NULL) { 332460ce86c7SWei Liu err = -ENOENT; 332560ce86c7SWei Liu goto out; 332660ce86c7SWei Liu } 332760ce86c7SWei Liu } else { 332860ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 332960ce86c7SWei Liu } 333060ce86c7SWei Liu 333160ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 333260ce86c7SWei Liu &newdirfidp->path, new_name); 333360ce86c7SWei Liu if (err < 0) { 333460ce86c7SWei Liu goto out; 333560ce86c7SWei Liu } 333660ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 333760ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 33384fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 333960ce86c7SWei Liu &newdirfidp->path, new_name); 334060ce86c7SWei Liu } 334160ce86c7SWei Liu out: 334260ce86c7SWei Liu if (olddirfidp) { 334360ce86c7SWei Liu put_fid(pdu, olddirfidp); 334460ce86c7SWei Liu } 334560ce86c7SWei Liu if (newdirfidp) { 334660ce86c7SWei Liu put_fid(pdu, newdirfidp); 334760ce86c7SWei Liu } 334860ce86c7SWei Liu return err; 334960ce86c7SWei Liu } 335060ce86c7SWei Liu 33518440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 335260ce86c7SWei Liu { 335360ce86c7SWei Liu ssize_t err = 0; 335460ce86c7SWei Liu size_t offset = 7; 335560ce86c7SWei Liu V9fsPDU *pdu = opaque; 335660ce86c7SWei Liu V9fsState *s = pdu->s; 335760ce86c7SWei Liu int32_t olddirfid, newdirfid; 335860ce86c7SWei Liu V9fsString old_name, new_name; 335960ce86c7SWei Liu 336060ce86c7SWei Liu v9fs_string_init(&old_name); 336160ce86c7SWei Liu v9fs_string_init(&new_name); 336260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 336360ce86c7SWei Liu &old_name, &newdirfid, &new_name); 336460ce86c7SWei Liu if (err < 0) { 336560ce86c7SWei Liu goto out_err; 336660ce86c7SWei Liu } 336760ce86c7SWei Liu 3368fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3369fff39a7aSGreg Kurz err = -ENOENT; 3370fff39a7aSGreg Kurz goto out_err; 3371fff39a7aSGreg Kurz } 3372fff39a7aSGreg Kurz 3373805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3374805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3375805b5d98SGreg Kurz err = -EISDIR; 3376805b5d98SGreg Kurz goto out_err; 3377805b5d98SGreg Kurz } 3378805b5d98SGreg Kurz 337960ce86c7SWei Liu v9fs_path_write_lock(s); 338060ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 338160ce86c7SWei Liu &old_name, newdirfid, &new_name); 338260ce86c7SWei Liu v9fs_path_unlock(s); 338360ce86c7SWei Liu if (!err) { 338460ce86c7SWei Liu err = offset; 338560ce86c7SWei Liu } 338660ce86c7SWei Liu 338760ce86c7SWei Liu out_err: 338860ce86c7SWei Liu pdu_complete(pdu, err); 338960ce86c7SWei Liu v9fs_string_free(&old_name); 339060ce86c7SWei Liu v9fs_string_free(&new_name); 339160ce86c7SWei Liu } 339260ce86c7SWei Liu 33938440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 339460ce86c7SWei Liu { 339560ce86c7SWei Liu int32_t fid; 339660ce86c7SWei Liu int err = 0; 339760ce86c7SWei Liu int16_t unused; 339860ce86c7SWei Liu V9fsStat v9stat; 339960ce86c7SWei Liu size_t offset = 7; 340060ce86c7SWei Liu struct stat stbuf; 340160ce86c7SWei Liu V9fsFidState *fidp; 340260ce86c7SWei Liu V9fsPDU *pdu = opaque; 34031d203986SGreg Kurz V9fsState *s = pdu->s; 340460ce86c7SWei Liu 340560ce86c7SWei Liu v9fs_stat_init(&v9stat); 340660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 340760ce86c7SWei Liu if (err < 0) { 340860ce86c7SWei Liu goto out_nofid; 340960ce86c7SWei Liu } 341060ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 341160ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 341260ce86c7SWei Liu 341360ce86c7SWei Liu fidp = get_fid(pdu, fid); 341460ce86c7SWei Liu if (fidp == NULL) { 341560ce86c7SWei Liu err = -EINVAL; 341660ce86c7SWei Liu goto out_nofid; 341760ce86c7SWei Liu } 341860ce86c7SWei Liu /* do we need to sync the file? */ 341960ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 342060ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 342160ce86c7SWei Liu goto out; 342260ce86c7SWei Liu } 342360ce86c7SWei Liu if (v9stat.mode != -1) { 342460ce86c7SWei Liu uint32_t v9_mode; 342560ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 342660ce86c7SWei Liu if (err < 0) { 342760ce86c7SWei Liu goto out; 342860ce86c7SWei Liu } 342960ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 343060ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 343160ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 343260ce86c7SWei Liu /* Attempting to change the type */ 343360ce86c7SWei Liu err = -EIO; 343460ce86c7SWei Liu goto out; 343560ce86c7SWei Liu } 343660ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 343760ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 343860ce86c7SWei Liu &v9stat.extension)); 343960ce86c7SWei Liu if (err < 0) { 344060ce86c7SWei Liu goto out; 344160ce86c7SWei Liu } 344260ce86c7SWei Liu } 344360ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 344460ce86c7SWei Liu struct timespec times[2]; 344560ce86c7SWei Liu if (v9stat.atime != -1) { 344660ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 344760ce86c7SWei Liu times[0].tv_nsec = 0; 344860ce86c7SWei Liu } else { 344960ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 345060ce86c7SWei Liu } 345160ce86c7SWei Liu if (v9stat.mtime != -1) { 345260ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 345360ce86c7SWei Liu times[1].tv_nsec = 0; 345460ce86c7SWei Liu } else { 345560ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 345660ce86c7SWei Liu } 345760ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 345860ce86c7SWei Liu if (err < 0) { 345960ce86c7SWei Liu goto out; 346060ce86c7SWei Liu } 346160ce86c7SWei Liu } 346260ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 346360ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 346460ce86c7SWei Liu if (err < 0) { 346560ce86c7SWei Liu goto out; 346660ce86c7SWei Liu } 346760ce86c7SWei Liu } 346860ce86c7SWei Liu if (v9stat.name.size != 0) { 34691d203986SGreg Kurz v9fs_path_write_lock(s); 347060ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 34711d203986SGreg Kurz v9fs_path_unlock(s); 347260ce86c7SWei Liu if (err < 0) { 347360ce86c7SWei Liu goto out; 347460ce86c7SWei Liu } 347560ce86c7SWei Liu } 347660ce86c7SWei Liu if (v9stat.length != -1) { 347760ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 347860ce86c7SWei Liu if (err < 0) { 347960ce86c7SWei Liu goto out; 348060ce86c7SWei Liu } 348160ce86c7SWei Liu } 348260ce86c7SWei Liu err = offset; 348360ce86c7SWei Liu out: 348460ce86c7SWei Liu put_fid(pdu, fidp); 348560ce86c7SWei Liu out_nofid: 348660ce86c7SWei Liu v9fs_stat_free(&v9stat); 348760ce86c7SWei Liu pdu_complete(pdu, err); 348860ce86c7SWei Liu } 348960ce86c7SWei Liu 349060ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 349160ce86c7SWei Liu { 349260ce86c7SWei Liu uint32_t f_type; 349360ce86c7SWei Liu uint32_t f_bsize; 349460ce86c7SWei Liu uint64_t f_blocks; 349560ce86c7SWei Liu uint64_t f_bfree; 349660ce86c7SWei Liu uint64_t f_bavail; 349760ce86c7SWei Liu uint64_t f_files; 349860ce86c7SWei Liu uint64_t f_ffree; 349960ce86c7SWei Liu uint64_t fsid_val; 350060ce86c7SWei Liu uint32_t f_namelen; 350160ce86c7SWei Liu size_t offset = 7; 350260ce86c7SWei Liu int32_t bsize_factor; 350360ce86c7SWei Liu 350460ce86c7SWei Liu /* 350560ce86c7SWei Liu * compute bsize factor based on host file system block size 350660ce86c7SWei Liu * and client msize 350760ce86c7SWei Liu */ 350860ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 350960ce86c7SWei Liu if (!bsize_factor) { 351060ce86c7SWei Liu bsize_factor = 1; 351160ce86c7SWei Liu } 351260ce86c7SWei Liu f_type = stbuf->f_type; 351360ce86c7SWei Liu f_bsize = stbuf->f_bsize; 351460ce86c7SWei Liu f_bsize *= bsize_factor; 351560ce86c7SWei Liu /* 351660ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 351760ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 351860ce86c7SWei Liu * blocks by bsize factor 351960ce86c7SWei Liu */ 352060ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 352160ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 352260ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 352360ce86c7SWei Liu f_files = stbuf->f_files; 352460ce86c7SWei Liu f_ffree = stbuf->f_ffree; 352560ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 352660ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 352760ce86c7SWei Liu f_namelen = stbuf->f_namelen; 352860ce86c7SWei Liu 352960ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 353060ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 353160ce86c7SWei Liu f_bavail, f_files, f_ffree, 353260ce86c7SWei Liu fsid_val, f_namelen); 353360ce86c7SWei Liu } 353460ce86c7SWei Liu 35358440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 353660ce86c7SWei Liu { 353760ce86c7SWei Liu int32_t fid; 353860ce86c7SWei Liu ssize_t retval = 0; 353960ce86c7SWei Liu size_t offset = 7; 354060ce86c7SWei Liu V9fsFidState *fidp; 354160ce86c7SWei Liu struct statfs stbuf; 354260ce86c7SWei Liu V9fsPDU *pdu = opaque; 354360ce86c7SWei Liu V9fsState *s = pdu->s; 354460ce86c7SWei Liu 354560ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 354660ce86c7SWei Liu if (retval < 0) { 354760ce86c7SWei Liu goto out_nofid; 354860ce86c7SWei Liu } 354960ce86c7SWei Liu fidp = get_fid(pdu, fid); 355060ce86c7SWei Liu if (fidp == NULL) { 355160ce86c7SWei Liu retval = -ENOENT; 355260ce86c7SWei Liu goto out_nofid; 355360ce86c7SWei Liu } 355460ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 355560ce86c7SWei Liu if (retval < 0) { 355660ce86c7SWei Liu goto out; 355760ce86c7SWei Liu } 355860ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 355960ce86c7SWei Liu if (retval < 0) { 356060ce86c7SWei Liu goto out; 356160ce86c7SWei Liu } 356260ce86c7SWei Liu retval += offset; 356360ce86c7SWei Liu out: 356460ce86c7SWei Liu put_fid(pdu, fidp); 356560ce86c7SWei Liu out_nofid: 356660ce86c7SWei Liu pdu_complete(pdu, retval); 356760ce86c7SWei Liu } 356860ce86c7SWei Liu 35698440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 357060ce86c7SWei Liu { 357160ce86c7SWei Liu 357260ce86c7SWei Liu int mode; 357360ce86c7SWei Liu gid_t gid; 357460ce86c7SWei Liu int32_t fid; 357560ce86c7SWei Liu V9fsQID qid; 357660ce86c7SWei Liu int err = 0; 357760ce86c7SWei Liu int major, minor; 357860ce86c7SWei Liu size_t offset = 7; 357960ce86c7SWei Liu V9fsString name; 358060ce86c7SWei Liu struct stat stbuf; 358160ce86c7SWei Liu V9fsFidState *fidp; 358260ce86c7SWei Liu V9fsPDU *pdu = opaque; 358360ce86c7SWei Liu 358460ce86c7SWei Liu v9fs_string_init(&name); 358560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 358660ce86c7SWei Liu &major, &minor, &gid); 358760ce86c7SWei Liu if (err < 0) { 358860ce86c7SWei Liu goto out_nofid; 358960ce86c7SWei Liu } 359060ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 359160ce86c7SWei Liu 3592fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3593fff39a7aSGreg Kurz err = -ENOENT; 3594fff39a7aSGreg Kurz goto out_nofid; 3595fff39a7aSGreg Kurz } 3596fff39a7aSGreg Kurz 3597805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3598805b5d98SGreg Kurz err = -EEXIST; 3599805b5d98SGreg Kurz goto out_nofid; 3600805b5d98SGreg Kurz } 3601805b5d98SGreg Kurz 360260ce86c7SWei Liu fidp = get_fid(pdu, fid); 360360ce86c7SWei Liu if (fidp == NULL) { 360460ce86c7SWei Liu err = -ENOENT; 360560ce86c7SWei Liu goto out_nofid; 360660ce86c7SWei Liu } 360760ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 360860ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 360960ce86c7SWei Liu if (err < 0) { 361060ce86c7SWei Liu goto out; 361160ce86c7SWei Liu } 36123b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36133b5ee9e8SAntonios Motakis if (err < 0) { 36143b5ee9e8SAntonios Motakis goto out; 36153b5ee9e8SAntonios Motakis } 361660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 361760ce86c7SWei Liu if (err < 0) { 361860ce86c7SWei Liu goto out; 361960ce86c7SWei Liu } 362060ce86c7SWei Liu err += offset; 362160ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 362260ce86c7SWei Liu qid.type, qid.version, qid.path); 362360ce86c7SWei Liu out: 362460ce86c7SWei Liu put_fid(pdu, fidp); 362560ce86c7SWei Liu out_nofid: 362660ce86c7SWei Liu pdu_complete(pdu, err); 362760ce86c7SWei Liu v9fs_string_free(&name); 362860ce86c7SWei Liu } 362960ce86c7SWei Liu 363060ce86c7SWei Liu /* 363160ce86c7SWei Liu * Implement posix byte range locking code 363260ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 363360ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 363460ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 363560ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 363660ce86c7SWei Liu * So when a TLOCK request comes, always return success 363760ce86c7SWei Liu */ 36388440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 363960ce86c7SWei Liu { 364060ce86c7SWei Liu V9fsFlock flock; 364160ce86c7SWei Liu size_t offset = 7; 364260ce86c7SWei Liu struct stat stbuf; 364360ce86c7SWei Liu V9fsFidState *fidp; 364460ce86c7SWei Liu int32_t fid, err = 0; 364560ce86c7SWei Liu V9fsPDU *pdu = opaque; 364660ce86c7SWei Liu 364760ce86c7SWei Liu v9fs_string_init(&flock.client_id); 364860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 364960ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 365060ce86c7SWei Liu &flock.proc_id, &flock.client_id); 365160ce86c7SWei Liu if (err < 0) { 365260ce86c7SWei Liu goto out_nofid; 365360ce86c7SWei Liu } 365460ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 365560ce86c7SWei Liu flock.type, flock.start, flock.length); 365660ce86c7SWei Liu 365760ce86c7SWei Liu 365860ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 365960ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 366060ce86c7SWei Liu err = -EINVAL; 366160ce86c7SWei Liu goto out_nofid; 366260ce86c7SWei Liu } 366360ce86c7SWei Liu fidp = get_fid(pdu, fid); 366460ce86c7SWei Liu if (fidp == NULL) { 366560ce86c7SWei Liu err = -ENOENT; 366660ce86c7SWei Liu goto out_nofid; 366760ce86c7SWei Liu } 366860ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 366960ce86c7SWei Liu if (err < 0) { 367060ce86c7SWei Liu goto out; 367160ce86c7SWei Liu } 36724bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 36734bae2b39SPaolo Bonzini if (err < 0) { 36744bae2b39SPaolo Bonzini goto out; 36754bae2b39SPaolo Bonzini } 36764bae2b39SPaolo Bonzini err += offset; 36774bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 367860ce86c7SWei Liu out: 367960ce86c7SWei Liu put_fid(pdu, fidp); 368060ce86c7SWei Liu out_nofid: 368160ce86c7SWei Liu pdu_complete(pdu, err); 368260ce86c7SWei Liu v9fs_string_free(&flock.client_id); 368360ce86c7SWei Liu } 368460ce86c7SWei Liu 368560ce86c7SWei Liu /* 368660ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 368760ce86c7SWei Liu * handling is done by client's VFS layer. 368860ce86c7SWei Liu */ 36898440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 369060ce86c7SWei Liu { 369160ce86c7SWei Liu size_t offset = 7; 369260ce86c7SWei Liu struct stat stbuf; 369360ce86c7SWei Liu V9fsFidState *fidp; 369460ce86c7SWei Liu V9fsGetlock glock; 369560ce86c7SWei Liu int32_t fid, err = 0; 369660ce86c7SWei Liu V9fsPDU *pdu = opaque; 369760ce86c7SWei Liu 369860ce86c7SWei Liu v9fs_string_init(&glock.client_id); 369960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 370060ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 370160ce86c7SWei Liu &glock.client_id); 370260ce86c7SWei Liu if (err < 0) { 370360ce86c7SWei Liu goto out_nofid; 370460ce86c7SWei Liu } 370560ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 370660ce86c7SWei Liu glock.type, glock.start, glock.length); 370760ce86c7SWei Liu 370860ce86c7SWei Liu fidp = get_fid(pdu, fid); 370960ce86c7SWei Liu if (fidp == NULL) { 371060ce86c7SWei Liu err = -ENOENT; 371160ce86c7SWei Liu goto out_nofid; 371260ce86c7SWei Liu } 371360ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 371460ce86c7SWei Liu if (err < 0) { 371560ce86c7SWei Liu goto out; 371660ce86c7SWei Liu } 371760ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 371860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 371960ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 372060ce86c7SWei Liu &glock.client_id); 372160ce86c7SWei Liu if (err < 0) { 372260ce86c7SWei Liu goto out; 372360ce86c7SWei Liu } 372460ce86c7SWei Liu err += offset; 372560ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 372660ce86c7SWei Liu glock.length, glock.proc_id); 372760ce86c7SWei Liu out: 372860ce86c7SWei Liu put_fid(pdu, fidp); 372960ce86c7SWei Liu out_nofid: 373060ce86c7SWei Liu pdu_complete(pdu, err); 373160ce86c7SWei Liu v9fs_string_free(&glock.client_id); 373260ce86c7SWei Liu } 373360ce86c7SWei Liu 37348440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 373560ce86c7SWei Liu { 373660ce86c7SWei Liu V9fsPDU *pdu = opaque; 373760ce86c7SWei Liu size_t offset = 7; 373860ce86c7SWei Liu int32_t fid; 373960ce86c7SWei Liu struct stat stbuf; 374060ce86c7SWei Liu V9fsQID qid; 374160ce86c7SWei Liu V9fsString name; 374260ce86c7SWei Liu V9fsFidState *fidp; 374360ce86c7SWei Liu gid_t gid; 374460ce86c7SWei Liu int mode; 374560ce86c7SWei Liu int err = 0; 374660ce86c7SWei Liu 374760ce86c7SWei Liu v9fs_string_init(&name); 374860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 374960ce86c7SWei Liu if (err < 0) { 375060ce86c7SWei Liu goto out_nofid; 375160ce86c7SWei Liu } 375260ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 375360ce86c7SWei Liu 3754fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3755fff39a7aSGreg Kurz err = -ENOENT; 3756fff39a7aSGreg Kurz goto out_nofid; 3757fff39a7aSGreg Kurz } 3758fff39a7aSGreg Kurz 3759805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3760805b5d98SGreg Kurz err = -EEXIST; 3761805b5d98SGreg Kurz goto out_nofid; 3762805b5d98SGreg Kurz } 3763805b5d98SGreg Kurz 376460ce86c7SWei Liu fidp = get_fid(pdu, fid); 376560ce86c7SWei Liu if (fidp == NULL) { 376660ce86c7SWei Liu err = -ENOENT; 376760ce86c7SWei Liu goto out_nofid; 376860ce86c7SWei Liu } 376960ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 377060ce86c7SWei Liu if (err < 0) { 377160ce86c7SWei Liu goto out; 377260ce86c7SWei Liu } 37733b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 37743b5ee9e8SAntonios Motakis if (err < 0) { 37753b5ee9e8SAntonios Motakis goto out; 37763b5ee9e8SAntonios Motakis } 377760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 377860ce86c7SWei Liu if (err < 0) { 377960ce86c7SWei Liu goto out; 378060ce86c7SWei Liu } 378160ce86c7SWei Liu err += offset; 378260ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 378360ce86c7SWei Liu qid.type, qid.version, qid.path, err); 378460ce86c7SWei Liu out: 378560ce86c7SWei Liu put_fid(pdu, fidp); 378660ce86c7SWei Liu out_nofid: 378760ce86c7SWei Liu pdu_complete(pdu, err); 378860ce86c7SWei Liu v9fs_string_free(&name); 378960ce86c7SWei Liu } 379060ce86c7SWei Liu 37918440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 379260ce86c7SWei Liu { 379360ce86c7SWei Liu int64_t size; 379460ce86c7SWei Liu V9fsString name; 379560ce86c7SWei Liu ssize_t err = 0; 379660ce86c7SWei Liu size_t offset = 7; 379760ce86c7SWei Liu int32_t fid, newfid; 379860ce86c7SWei Liu V9fsFidState *file_fidp; 379960ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 380060ce86c7SWei Liu V9fsPDU *pdu = opaque; 380160ce86c7SWei Liu V9fsState *s = pdu->s; 380260ce86c7SWei Liu 380360ce86c7SWei Liu v9fs_string_init(&name); 380460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 380560ce86c7SWei Liu if (err < 0) { 380660ce86c7SWei Liu goto out_nofid; 380760ce86c7SWei Liu } 380860ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 380960ce86c7SWei Liu 381060ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 381160ce86c7SWei Liu if (file_fidp == NULL) { 381260ce86c7SWei Liu err = -ENOENT; 381360ce86c7SWei Liu goto out_nofid; 381460ce86c7SWei Liu } 381560ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 381660ce86c7SWei Liu if (xattr_fidp == NULL) { 381760ce86c7SWei Liu err = -EINVAL; 381860ce86c7SWei Liu goto out; 381960ce86c7SWei Liu } 382060ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3821ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 382260ce86c7SWei Liu /* 382360ce86c7SWei Liu * listxattr request. Get the size first 382460ce86c7SWei Liu */ 382560ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 382660ce86c7SWei Liu if (size < 0) { 382760ce86c7SWei Liu err = size; 382860ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 382960ce86c7SWei Liu goto out; 383060ce86c7SWei Liu } 383160ce86c7SWei Liu /* 383260ce86c7SWei Liu * Read the xattr value 383360ce86c7SWei Liu */ 383460ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 383560ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3836dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38377bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3838a647502cSKeno Fischer if (size) { 383960ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 384060ce86c7SWei Liu xattr_fidp->fs.xattr.value, 384160ce86c7SWei Liu xattr_fidp->fs.xattr.len); 384260ce86c7SWei Liu if (err < 0) { 384360ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 384460ce86c7SWei Liu goto out; 384560ce86c7SWei Liu } 384660ce86c7SWei Liu } 384760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 384860ce86c7SWei Liu if (err < 0) { 384960ce86c7SWei Liu goto out; 385060ce86c7SWei Liu } 385160ce86c7SWei Liu err += offset; 385260ce86c7SWei Liu } else { 385360ce86c7SWei Liu /* 385460ce86c7SWei Liu * specific xattr fid. We check for xattr 385560ce86c7SWei Liu * presence also collect the xattr size 385660ce86c7SWei Liu */ 385760ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 385860ce86c7SWei Liu &name, NULL, 0); 385960ce86c7SWei Liu if (size < 0) { 386060ce86c7SWei Liu err = size; 386160ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 386260ce86c7SWei Liu goto out; 386360ce86c7SWei Liu } 386460ce86c7SWei Liu /* 386560ce86c7SWei Liu * Read the xattr value 386660ce86c7SWei Liu */ 386760ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 386860ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3869dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38707bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3871a647502cSKeno Fischer if (size) { 387260ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 387360ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 387460ce86c7SWei Liu xattr_fidp->fs.xattr.len); 387560ce86c7SWei Liu if (err < 0) { 387660ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 387760ce86c7SWei Liu goto out; 387860ce86c7SWei Liu } 387960ce86c7SWei Liu } 388060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 388160ce86c7SWei Liu if (err < 0) { 388260ce86c7SWei Liu goto out; 388360ce86c7SWei Liu } 388460ce86c7SWei Liu err += offset; 388560ce86c7SWei Liu } 388660ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 388760ce86c7SWei Liu out: 388860ce86c7SWei Liu put_fid(pdu, file_fidp); 388960ce86c7SWei Liu if (xattr_fidp) { 389060ce86c7SWei Liu put_fid(pdu, xattr_fidp); 389160ce86c7SWei Liu } 389260ce86c7SWei Liu out_nofid: 389360ce86c7SWei Liu pdu_complete(pdu, err); 389460ce86c7SWei Liu v9fs_string_free(&name); 389560ce86c7SWei Liu } 389660ce86c7SWei Liu 38978440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 389860ce86c7SWei Liu { 3899aca6897fSKeno Fischer int flags, rflags = 0; 390060ce86c7SWei Liu int32_t fid; 39013b79ef2cSGreg Kurz uint64_t size; 390260ce86c7SWei Liu ssize_t err = 0; 390360ce86c7SWei Liu V9fsString name; 390460ce86c7SWei Liu size_t offset = 7; 390560ce86c7SWei Liu V9fsFidState *file_fidp; 390660ce86c7SWei Liu V9fsFidState *xattr_fidp; 390760ce86c7SWei Liu V9fsPDU *pdu = opaque; 390860ce86c7SWei Liu 390960ce86c7SWei Liu v9fs_string_init(&name); 391060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 391160ce86c7SWei Liu if (err < 0) { 391260ce86c7SWei Liu goto out_nofid; 391360ce86c7SWei Liu } 391460ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 391560ce86c7SWei Liu 3916aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3917aca6897fSKeno Fischer err = -EINVAL; 3918aca6897fSKeno Fischer goto out_nofid; 3919aca6897fSKeno Fischer } 3920aca6897fSKeno Fischer 3921aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3922aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3923aca6897fSKeno Fischer } 3924aca6897fSKeno Fischer 3925aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3926aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3927aca6897fSKeno Fischer } 3928aca6897fSKeno Fischer 39293b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 39303b79ef2cSGreg Kurz err = -E2BIG; 39313b79ef2cSGreg Kurz goto out_nofid; 39323b79ef2cSGreg Kurz } 39333b79ef2cSGreg Kurz 393460ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 393560ce86c7SWei Liu if (file_fidp == NULL) { 393660ce86c7SWei Liu err = -EINVAL; 393760ce86c7SWei Liu goto out_nofid; 393860ce86c7SWei Liu } 3939dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3940dd654e03SGreg Kurz err = -EINVAL; 3941dd654e03SGreg Kurz goto out_put_fid; 3942dd654e03SGreg Kurz } 3943dd654e03SGreg Kurz 394460ce86c7SWei Liu /* Make the file fid point to xattr */ 394560ce86c7SWei Liu xattr_fidp = file_fidp; 394660ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 394760ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3948dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 394960ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3950aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 395160ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 395260ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3953eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 395460ce86c7SWei Liu err = offset; 3955dd654e03SGreg Kurz out_put_fid: 395660ce86c7SWei Liu put_fid(pdu, file_fidp); 395760ce86c7SWei Liu out_nofid: 395860ce86c7SWei Liu pdu_complete(pdu, err); 395960ce86c7SWei Liu v9fs_string_free(&name); 396060ce86c7SWei Liu } 396160ce86c7SWei Liu 39628440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 396360ce86c7SWei Liu { 396460ce86c7SWei Liu V9fsPDU *pdu = opaque; 396560ce86c7SWei Liu size_t offset = 7; 396660ce86c7SWei Liu V9fsString target; 396760ce86c7SWei Liu int32_t fid; 396860ce86c7SWei Liu int err = 0; 396960ce86c7SWei Liu V9fsFidState *fidp; 397060ce86c7SWei Liu 397160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 397260ce86c7SWei Liu if (err < 0) { 397360ce86c7SWei Liu goto out_nofid; 397460ce86c7SWei Liu } 397560ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 397660ce86c7SWei Liu fidp = get_fid(pdu, fid); 397760ce86c7SWei Liu if (fidp == NULL) { 397860ce86c7SWei Liu err = -ENOENT; 397960ce86c7SWei Liu goto out_nofid; 398060ce86c7SWei Liu } 398160ce86c7SWei Liu 398260ce86c7SWei Liu v9fs_string_init(&target); 398360ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 398460ce86c7SWei Liu if (err < 0) { 398560ce86c7SWei Liu goto out; 398660ce86c7SWei Liu } 398760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 398860ce86c7SWei Liu if (err < 0) { 398960ce86c7SWei Liu v9fs_string_free(&target); 399060ce86c7SWei Liu goto out; 399160ce86c7SWei Liu } 399260ce86c7SWei Liu err += offset; 399360ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 399460ce86c7SWei Liu v9fs_string_free(&target); 399560ce86c7SWei Liu out: 399660ce86c7SWei Liu put_fid(pdu, fidp); 399760ce86c7SWei Liu out_nofid: 399860ce86c7SWei Liu pdu_complete(pdu, err); 399960ce86c7SWei Liu } 400060ce86c7SWei Liu 400160ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 400260ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 400360ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 400460ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 400560ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 400660ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 400760ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 400860ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 400960ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 401060ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 401160ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 401260ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 401360ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 401460ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 401560ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 401660ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 401760ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 401860ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 401960ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 402060ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 402160ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 402260ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 402360ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 402460ce86c7SWei Liu [P9_TREAD] = v9fs_read, 402560ce86c7SWei Liu #if 0 402660ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 402760ce86c7SWei Liu #endif 402860ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 402960ce86c7SWei Liu [P9_TLINK] = v9fs_link, 403060ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 403160ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 403260ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 403360ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 403460ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 403560ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 403660ce86c7SWei Liu }; 403760ce86c7SWei Liu 40388440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 403960ce86c7SWei Liu { 404060ce86c7SWei Liu V9fsPDU *pdu = opaque; 404160ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 404260ce86c7SWei Liu } 404360ce86c7SWei Liu 40448440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 404560ce86c7SWei Liu { 404660ce86c7SWei Liu V9fsPDU *pdu = opaque; 404760ce86c7SWei Liu pdu_complete(pdu, -EROFS); 404860ce86c7SWei Liu } 404960ce86c7SWei Liu 405060ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 405160ce86c7SWei Liu { 405260ce86c7SWei Liu switch (pdu->id) { 405360ce86c7SWei Liu case P9_TREADDIR: 405460ce86c7SWei Liu case P9_TSTATFS: 405560ce86c7SWei Liu case P9_TGETATTR: 405660ce86c7SWei Liu case P9_TXATTRWALK: 405760ce86c7SWei Liu case P9_TLOCK: 405860ce86c7SWei Liu case P9_TGETLOCK: 405960ce86c7SWei Liu case P9_TREADLINK: 406060ce86c7SWei Liu case P9_TVERSION: 406160ce86c7SWei Liu case P9_TLOPEN: 406260ce86c7SWei Liu case P9_TATTACH: 406360ce86c7SWei Liu case P9_TSTAT: 406460ce86c7SWei Liu case P9_TWALK: 406560ce86c7SWei Liu case P9_TCLUNK: 406660ce86c7SWei Liu case P9_TFSYNC: 406760ce86c7SWei Liu case P9_TOPEN: 406860ce86c7SWei Liu case P9_TREAD: 406960ce86c7SWei Liu case P9_TAUTH: 407060ce86c7SWei Liu case P9_TFLUSH: 407160ce86c7SWei Liu return 1; 407260ce86c7SWei Liu default: 407360ce86c7SWei Liu return 0; 407460ce86c7SWei Liu } 407560ce86c7SWei Liu } 407660ce86c7SWei Liu 4077506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 407860ce86c7SWei Liu { 407960ce86c7SWei Liu Coroutine *co; 408060ce86c7SWei Liu CoroutineEntry *handler; 408160ce86c7SWei Liu V9fsState *s = pdu->s; 408260ce86c7SWei Liu 4083506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4084506f3275SGreg Kurz pdu->id = hdr->id; 4085506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4086506f3275SGreg Kurz 408760ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 408860ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 408960ce86c7SWei Liu handler = v9fs_op_not_supp; 4090d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4091d1471233SGreg Kurz handler = v9fs_fs_ro; 409260ce86c7SWei Liu } else { 409360ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 409460ce86c7SWei Liu } 409560ce86c7SWei Liu 4096506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 40970b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 40980b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 409960ce86c7SWei Liu } 410060ce86c7SWei Liu 41012a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4102066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4103066eb006SGreg Kurz Error **errp) 41042a0c56aaSWei Liu { 410592c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 41062a0c56aaSWei Liu int i, len; 41072a0c56aaSWei Liu struct stat stat; 41082a0c56aaSWei Liu FsDriverEntry *fse; 41092a0c56aaSWei Liu V9fsPath path; 41102a0c56aaSWei Liu int rc = 1; 41112a0c56aaSWei Liu 4112066eb006SGreg Kurz assert(!s->transport); 4113066eb006SGreg Kurz s->transport = t; 4114066eb006SGreg Kurz 41152a0c56aaSWei Liu /* initialize pdu allocator */ 41162a0c56aaSWei Liu QLIST_INIT(&s->free_list); 41172a0c56aaSWei Liu QLIST_INIT(&s->active_list); 41180d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4119583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4120583f21f8SStefano Stabellini s->pdus[i].s = s; 4121583f21f8SStefano Stabellini s->pdus[i].idx = i; 41222a0c56aaSWei Liu } 41232a0c56aaSWei Liu 41242a0c56aaSWei Liu v9fs_path_init(&path); 41252a0c56aaSWei Liu 41262a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 41272a0c56aaSWei Liu 41282a0c56aaSWei Liu if (!fse) { 41292a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 41302a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 41312a0c56aaSWei Liu "id = %s", 41322a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 41332a0c56aaSWei Liu goto out; 41342a0c56aaSWei Liu } 41352a0c56aaSWei Liu 41362a0c56aaSWei Liu if (!s->fsconf.tag) { 41372a0c56aaSWei Liu /* we haven't specified a mount_tag */ 41382a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 41392a0c56aaSWei Liu s->fsconf.fsdev_id); 41402a0c56aaSWei Liu goto out; 41412a0c56aaSWei Liu } 41422a0c56aaSWei Liu 41432a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 41442a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 41452a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 41462a0c56aaSWei Liu len = strlen(s->fsconf.tag); 41472a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 41482a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 41492a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 41502a0c56aaSWei Liu goto out; 41512a0c56aaSWei Liu } 41522a0c56aaSWei Liu 41532a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 41542a0c56aaSWei Liu s->ctx.uid = -1; 41552a0c56aaSWei Liu 41562a0c56aaSWei Liu s->ops = fse->ops; 41572a0c56aaSWei Liu 4158b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4159b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4160b96feb2cSTobias Schramm 4161feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 41622a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 41632a0c56aaSWei Liu 416465603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 416565603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 416665603a80SGreg Kurz s->fsconf.fsdev_id); 41672a0c56aaSWei Liu goto out; 41682a0c56aaSWei Liu } 41692a0c56aaSWei Liu 41702a0c56aaSWei Liu /* 41712a0c56aaSWei Liu * Check details of export path, We need to use fs driver 41722a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 41732a0c56aaSWei Liu * use co-routines here. 41742a0c56aaSWei Liu */ 41752a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 41762a0c56aaSWei Liu error_setg(errp, 41772a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 41782a0c56aaSWei Liu goto out; 41792a0c56aaSWei Liu } 41802a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41812a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41822a0c56aaSWei Liu goto out; 41832a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41842a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41852a0c56aaSWei Liu goto out; 41862a0c56aaSWei Liu } 4187b8bbdb88SPradeep Jagadeesh 41883b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41893b5ee9e8SAntonios Motakis 41906b6aa828SChristian Schoenebeck /* init inode remapping : */ 41916b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 41926b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 41936b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 41946b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 41956b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 41961a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 41976b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 41986b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4199f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 42001a6ed33cSAntonios Motakis 4201b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4202b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4203b8bbdb88SPradeep Jagadeesh 42042a0c56aaSWei Liu rc = 0; 42052a0c56aaSWei Liu out: 42062a0c56aaSWei Liu if (rc) { 4207b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4208702dbcc2SLi Qiang } 42092a0c56aaSWei Liu v9fs_path_free(&path); 42102a0c56aaSWei Liu return rc; 42112a0c56aaSWei Liu } 42122a0c56aaSWei Liu 4213b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 42142a0c56aaSWei Liu { 4215c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4216702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4217702dbcc2SLi Qiang } 4218c0da0cb7SGreg Kurz if (s->ctx.fst) { 4219b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4220c0da0cb7SGreg Kurz } 42212a0c56aaSWei Liu g_free(s->tag); 42226b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4223f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4224f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 42254774718eSLi Qiang g_free(s->ctx.fs_root); 42262a0c56aaSWei Liu } 42272a0c56aaSWei Liu 42280e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 42290e44a0fdSGreg Kurz V9fsPDU pdu; 42300e44a0fdSGreg Kurz bool done; 42310e44a0fdSGreg Kurz } VirtfsCoResetData; 42320e44a0fdSGreg Kurz 42330e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 42340e44a0fdSGreg Kurz { 42350e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 42360e44a0fdSGreg Kurz 42370e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 42380e44a0fdSGreg Kurz data->done = true; 42390e44a0fdSGreg Kurz } 42400e44a0fdSGreg Kurz 42410e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 42420e44a0fdSGreg Kurz { 42430e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 42440e44a0fdSGreg Kurz Coroutine *co; 42450e44a0fdSGreg Kurz 42460e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 42470e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42480e44a0fdSGreg Kurz } 42490e44a0fdSGreg Kurz 42500e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 42510e44a0fdSGreg Kurz qemu_coroutine_enter(co); 42520e44a0fdSGreg Kurz 42530e44a0fdSGreg Kurz while (!data.done) { 42540e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42550e44a0fdSGreg Kurz } 42560e44a0fdSGreg Kurz } 42570e44a0fdSGreg Kurz 425860ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 425960ce86c7SWei Liu { 426060ce86c7SWei Liu struct rlimit rlim; 426160ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 426263325b18SGreg Kurz error_report("Failed to get the resource limit"); 426360ce86c7SWei Liu exit(1); 426460ce86c7SWei Liu } 426560ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 426660ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 426760ce86c7SWei Liu } 4268