160ce86c7SWei Liu /* 260ce86c7SWei Liu * Virtio 9p backend 360ce86c7SWei Liu * 460ce86c7SWei Liu * Copyright IBM, Corp. 2010 560ce86c7SWei Liu * 660ce86c7SWei Liu * Authors: 760ce86c7SWei Liu * Anthony Liguori <aliguori@us.ibm.com> 860ce86c7SWei Liu * 960ce86c7SWei Liu * This work is licensed under the terms of the GNU GPL, version 2. See 1060ce86c7SWei Liu * the COPYING file in the top-level directory. 1160ce86c7SWei Liu * 1260ce86c7SWei Liu */ 1360ce86c7SWei Liu 14fbc04127SPeter Maydell #include "qemu/osdep.h" 15e3e83f2eSGreg Kurz #include <glib/gprintf.h> 1660ce86c7SWei Liu #include "hw/virtio/virtio.h" 17da34e65cSMarkus Armbruster #include "qapi/error.h" 1860ce86c7SWei Liu #include "qemu/error-report.h" 1960ce86c7SWei Liu #include "qemu/iov.h" 20db725815SMarkus Armbruster #include "qemu/main-loop.h" 2160ce86c7SWei Liu #include "qemu/sockets.h" 2260ce86c7SWei Liu #include "virtio-9p.h" 2360ce86c7SWei Liu #include "fsdev/qemu-fsdev.h" 2460ce86c7SWei Liu #include "9p-xattr.h" 2560ce86c7SWei Liu #include "coth.h" 2660ce86c7SWei Liu #include "trace.h" 27795c40b8SJuan Quintela #include "migration/blocker.h" 28357e2f7fSGreg Kurz #include "sysemu/qtest.h" 291a6ed33cSAntonios Motakis #include "qemu/xxhash.h" 306b6aa828SChristian Schoenebeck #include <math.h> 3103556ea9SDan Robertson #include <linux/limits.h> 3260ce86c7SWei Liu 3360ce86c7SWei Liu int open_fd_hw; 3460ce86c7SWei Liu int total_open_fd; 3560ce86c7SWei Liu static int open_fd_rc; 3660ce86c7SWei Liu 3760ce86c7SWei Liu enum { 3860ce86c7SWei Liu Oread = 0x00, 3960ce86c7SWei Liu Owrite = 0x01, 4060ce86c7SWei Liu Ordwr = 0x02, 4160ce86c7SWei Liu Oexec = 0x03, 4260ce86c7SWei Liu Oexcl = 0x04, 4360ce86c7SWei Liu Otrunc = 0x10, 4460ce86c7SWei Liu Orexec = 0x20, 4560ce86c7SWei Liu Orclose = 0x40, 4660ce86c7SWei Liu Oappend = 0x80, 4760ce86c7SWei Liu }; 4860ce86c7SWei Liu 4975673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 5060ce86c7SWei Liu { 5160ce86c7SWei Liu ssize_t ret; 5260ce86c7SWei Liu va_list ap; 5360ce86c7SWei Liu 5460ce86c7SWei Liu va_start(ap, fmt); 55ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 5660ce86c7SWei Liu va_end(ap); 5760ce86c7SWei Liu 5860ce86c7SWei Liu return ret; 5960ce86c7SWei Liu } 6060ce86c7SWei Liu 6175673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 6260ce86c7SWei Liu { 6360ce86c7SWei Liu ssize_t ret; 6460ce86c7SWei Liu va_list ap; 6560ce86c7SWei Liu 6660ce86c7SWei Liu va_start(ap, fmt); 67ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 6860ce86c7SWei Liu va_end(ap); 6960ce86c7SWei Liu 7060ce86c7SWei Liu return ret; 7160ce86c7SWei Liu } 7260ce86c7SWei Liu 7360ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 7460ce86c7SWei Liu { 7560ce86c7SWei Liu int ret = 0; 7660ce86c7SWei Liu 7760ce86c7SWei Liu switch (mode & 3) { 7860ce86c7SWei Liu case Oread: 7960ce86c7SWei Liu ret = O_RDONLY; 8060ce86c7SWei Liu break; 8160ce86c7SWei Liu case Ordwr: 8260ce86c7SWei Liu ret = O_RDWR; 8360ce86c7SWei Liu break; 8460ce86c7SWei Liu case Owrite: 8560ce86c7SWei Liu ret = O_WRONLY; 8660ce86c7SWei Liu break; 8760ce86c7SWei Liu case Oexec: 8860ce86c7SWei Liu ret = O_RDONLY; 8960ce86c7SWei Liu break; 9060ce86c7SWei Liu } 9160ce86c7SWei Liu 9260ce86c7SWei Liu if (mode & Otrunc) { 9360ce86c7SWei Liu ret |= O_TRUNC; 9460ce86c7SWei Liu } 9560ce86c7SWei Liu 9660ce86c7SWei Liu if (mode & Oappend) { 9760ce86c7SWei Liu ret |= O_APPEND; 9860ce86c7SWei Liu } 9960ce86c7SWei Liu 10060ce86c7SWei Liu if (mode & Oexcl) { 10160ce86c7SWei Liu ret |= O_EXCL; 10260ce86c7SWei Liu } 10360ce86c7SWei Liu 10460ce86c7SWei Liu return ret; 10560ce86c7SWei Liu } 10660ce86c7SWei Liu 1078e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 10860ce86c7SWei Liu int dotl_flag; 10960ce86c7SWei Liu int open_flag; 1108e71b96cSGreg Kurz } DotlOpenflagMap; 11160ce86c7SWei Liu 11260ce86c7SWei Liu static int dotl_to_open_flags(int flags) 11360ce86c7SWei Liu { 11460ce86c7SWei Liu int i; 11560ce86c7SWei Liu /* 11660ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 11760ce86c7SWei Liu * and P9_DOTL_NOACCESS 11860ce86c7SWei Liu */ 11960ce86c7SWei Liu int oflags = flags & O_ACCMODE; 12060ce86c7SWei Liu 1218e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 12260ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 12360ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 12460ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 12560ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 12660ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 12760ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 12860ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 12960ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 13060ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 13160ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 13260ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 13360ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 13460ce86c7SWei Liu { P9_DOTL_NOATIME, O_NOATIME }, 13560ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 13660ce86c7SWei Liu }; 13760ce86c7SWei Liu 13860ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 13960ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 14060ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 14160ce86c7SWei Liu } 14260ce86c7SWei Liu } 14360ce86c7SWei Liu 14460ce86c7SWei Liu return oflags; 14560ce86c7SWei Liu } 14660ce86c7SWei Liu 14760ce86c7SWei Liu void cred_init(FsCred *credp) 14860ce86c7SWei Liu { 14960ce86c7SWei Liu credp->fc_uid = -1; 15060ce86c7SWei Liu credp->fc_gid = -1; 15160ce86c7SWei Liu credp->fc_mode = -1; 15260ce86c7SWei Liu credp->fc_rdev = -1; 15360ce86c7SWei Liu } 15460ce86c7SWei Liu 15560ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 15660ce86c7SWei Liu { 15760ce86c7SWei Liu int flags; 15860ce86c7SWei Liu /* 15960ce86c7SWei Liu * Filter the client open flags 16060ce86c7SWei Liu */ 16160ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 16260ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 16360ce86c7SWei Liu /* 16460ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 16560ce86c7SWei Liu */ 16660ce86c7SWei Liu flags &= ~O_DIRECT; 16760ce86c7SWei Liu return flags; 16860ce86c7SWei Liu } 16960ce86c7SWei Liu 17060ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 17160ce86c7SWei Liu { 17260ce86c7SWei Liu path->data = NULL; 17360ce86c7SWei Liu path->size = 0; 17460ce86c7SWei Liu } 17560ce86c7SWei Liu 17660ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 17760ce86c7SWei Liu { 17860ce86c7SWei Liu g_free(path->data); 17960ce86c7SWei Liu path->data = NULL; 18060ce86c7SWei Liu path->size = 0; 18160ce86c7SWei Liu } 18260ce86c7SWei Liu 183e3e83f2eSGreg Kurz 184e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 185e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 186e3e83f2eSGreg Kurz { 187e3e83f2eSGreg Kurz va_list ap; 188e3e83f2eSGreg Kurz 189e3e83f2eSGreg Kurz v9fs_path_free(path); 190e3e83f2eSGreg Kurz 191e3e83f2eSGreg Kurz va_start(ap, fmt); 192e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 193e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 194e3e83f2eSGreg Kurz va_end(ap); 195e3e83f2eSGreg Kurz } 196e3e83f2eSGreg Kurz 197e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 19860ce86c7SWei Liu { 199e446a1ebSMarc-André Lureau v9fs_path_free(dst); 200e446a1ebSMarc-André Lureau dst->size = src->size; 201e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 20260ce86c7SWei Liu } 20360ce86c7SWei Liu 20460ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 20560ce86c7SWei Liu const char *name, V9fsPath *path) 20660ce86c7SWei Liu { 20760ce86c7SWei Liu int err; 20860ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 20960ce86c7SWei Liu if (err < 0) { 21060ce86c7SWei Liu err = -errno; 21160ce86c7SWei Liu } 21260ce86c7SWei Liu return err; 21360ce86c7SWei Liu } 21460ce86c7SWei Liu 21560ce86c7SWei Liu /* 21660ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 21760ce86c7SWei Liu * 21860ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 21960ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 22060ce86c7SWei Liu */ 22160ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 22260ce86c7SWei Liu { 22360ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 22460ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 22560ce86c7SWei Liu return 1; 22660ce86c7SWei Liu } 22760ce86c7SWei Liu } 22860ce86c7SWei Liu return 0; 22960ce86c7SWei Liu } 23060ce86c7SWei Liu 23160ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 23260ce86c7SWei Liu { 23360ce86c7SWei Liu return str->size; 23460ce86c7SWei Liu } 23560ce86c7SWei Liu 23660ce86c7SWei Liu /* 23760ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2388440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 23960ce86c7SWei Liu { 24060ce86c7SWei Liu int err = 1; 24160ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 24260ce86c7SWei Liu if (f->fs.fd == -1) { 24360ce86c7SWei Liu do { 24460ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 24560ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 24660ce86c7SWei Liu } 24760ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 248f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 24960ce86c7SWei Liu do { 25060ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 25160ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25260ce86c7SWei Liu } 25360ce86c7SWei Liu } 25460ce86c7SWei Liu return err; 25560ce86c7SWei Liu } 25660ce86c7SWei Liu 2578440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 25860ce86c7SWei Liu { 25960ce86c7SWei Liu int err; 26060ce86c7SWei Liu V9fsFidState *f; 26160ce86c7SWei Liu V9fsState *s = pdu->s; 26260ce86c7SWei Liu 263feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 26460ce86c7SWei Liu BUG_ON(f->clunked); 26560ce86c7SWei Liu if (f->fid == fid) { 26660ce86c7SWei Liu /* 26760ce86c7SWei Liu * Update the fid ref upfront so that 26860ce86c7SWei Liu * we don't get reclaimed when we yield 26960ce86c7SWei Liu * in open later. 27060ce86c7SWei Liu */ 27160ce86c7SWei Liu f->ref++; 27260ce86c7SWei Liu /* 27360ce86c7SWei Liu * check whether we need to reopen the 27460ce86c7SWei Liu * file. We might have closed the fd 27560ce86c7SWei Liu * while trying to free up some file 27660ce86c7SWei Liu * descriptors. 27760ce86c7SWei Liu */ 27860ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 27960ce86c7SWei Liu if (err < 0) { 28060ce86c7SWei Liu f->ref--; 28160ce86c7SWei Liu return NULL; 28260ce86c7SWei Liu } 28360ce86c7SWei Liu /* 28460ce86c7SWei Liu * Mark the fid as referenced so that the LRU 28560ce86c7SWei Liu * reclaim won't close the file descriptor 28660ce86c7SWei Liu */ 28760ce86c7SWei Liu f->flags |= FID_REFERENCED; 28860ce86c7SWei Liu return f; 28960ce86c7SWei Liu } 29060ce86c7SWei Liu } 29160ce86c7SWei Liu return NULL; 29260ce86c7SWei Liu } 29360ce86c7SWei Liu 29460ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 29560ce86c7SWei Liu { 29660ce86c7SWei Liu V9fsFidState *f; 29760ce86c7SWei Liu 298feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 29960ce86c7SWei Liu /* If fid is already there return NULL */ 30060ce86c7SWei Liu BUG_ON(f->clunked); 30160ce86c7SWei Liu if (f->fid == fid) { 30260ce86c7SWei Liu return NULL; 30360ce86c7SWei Liu } 30460ce86c7SWei Liu } 30560ce86c7SWei Liu f = g_malloc0(sizeof(V9fsFidState)); 30660ce86c7SWei Liu f->fid = fid; 30760ce86c7SWei Liu f->fid_type = P9_FID_NONE; 30860ce86c7SWei Liu f->ref = 1; 30960ce86c7SWei Liu /* 31060ce86c7SWei Liu * Mark the fid as referenced so that the LRU 31160ce86c7SWei Liu * reclaim won't close the file descriptor 31260ce86c7SWei Liu */ 31360ce86c7SWei Liu f->flags |= FID_REFERENCED; 31420b7f45bSGreg Kurz QSIMPLEQ_INSERT_TAIL(&s->fid_list, f, next); 31560ce86c7SWei Liu 316d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 317d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3187cde47d4SGreg Kurz 31960ce86c7SWei Liu return f; 32060ce86c7SWei Liu } 32160ce86c7SWei Liu 3228440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 32360ce86c7SWei Liu { 32460ce86c7SWei Liu int retval = 0; 32560ce86c7SWei Liu 326dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 32760ce86c7SWei Liu /* getxattr/listxattr fid */ 32860ce86c7SWei Liu goto free_value; 32960ce86c7SWei Liu } 33060ce86c7SWei Liu /* 33160ce86c7SWei Liu * if this is fid for setxattr. clunk should 33260ce86c7SWei Liu * result in setxattr localcall 33360ce86c7SWei Liu */ 33460ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 33560ce86c7SWei Liu /* clunk after partial write */ 33660ce86c7SWei Liu retval = -EINVAL; 33760ce86c7SWei Liu goto free_out; 33860ce86c7SWei Liu } 33960ce86c7SWei Liu if (fidp->fs.xattr.len) { 34060ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 34160ce86c7SWei Liu fidp->fs.xattr.value, 34260ce86c7SWei Liu fidp->fs.xattr.len, 34360ce86c7SWei Liu fidp->fs.xattr.flags); 34460ce86c7SWei Liu } else { 34560ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 34660ce86c7SWei Liu } 34760ce86c7SWei Liu free_out: 34860ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 34960ce86c7SWei Liu free_value: 35060ce86c7SWei Liu g_free(fidp->fs.xattr.value); 35160ce86c7SWei Liu return retval; 35260ce86c7SWei Liu } 35360ce86c7SWei Liu 3548440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 35560ce86c7SWei Liu { 35660ce86c7SWei Liu int retval = 0; 35760ce86c7SWei Liu 35860ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 35960ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 36060ce86c7SWei Liu if (fidp->fs.fd != -1) { 36160ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 36260ce86c7SWei Liu } 36360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 364f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 36560ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 36660ce86c7SWei Liu } 36760ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 36860ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 36960ce86c7SWei Liu } 37060ce86c7SWei Liu v9fs_path_free(&fidp->path); 37160ce86c7SWei Liu g_free(fidp); 37260ce86c7SWei Liu return retval; 37360ce86c7SWei Liu } 37460ce86c7SWei Liu 3758440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 37660ce86c7SWei Liu { 37760ce86c7SWei Liu BUG_ON(!fidp->ref); 37860ce86c7SWei Liu fidp->ref--; 37960ce86c7SWei Liu /* 38060ce86c7SWei Liu * Don't free the fid if it is in reclaim list 38160ce86c7SWei Liu */ 38260ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 38360ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 38460ce86c7SWei Liu /* 38560ce86c7SWei Liu * if the clunked fid is root fid then we 38660ce86c7SWei Liu * have unmounted the fs on the client side. 38760ce86c7SWei Liu * delete the migration blocker. Ideally, this 38860ce86c7SWei Liu * should be hooked to transport close notification 38960ce86c7SWei Liu */ 39060ce86c7SWei Liu if (pdu->s->migration_blocker) { 39160ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 39260ce86c7SWei Liu error_free(pdu->s->migration_blocker); 39360ce86c7SWei Liu pdu->s->migration_blocker = NULL; 39460ce86c7SWei Liu } 39560ce86c7SWei Liu } 39660ce86c7SWei Liu return free_fid(pdu, fidp); 39760ce86c7SWei Liu } 39860ce86c7SWei Liu return 0; 39960ce86c7SWei Liu } 40060ce86c7SWei Liu 40160ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 40260ce86c7SWei Liu { 403feabd6cfSGreg Kurz V9fsFidState *fidp; 40460ce86c7SWei Liu 405feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 406feabd6cfSGreg Kurz if (fidp->fid == fid) { 407feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 4082e53160fSGreg Kurz fidp->clunked = true; 40960ce86c7SWei Liu return fidp; 41060ce86c7SWei Liu } 411feabd6cfSGreg Kurz } 412feabd6cfSGreg Kurz return NULL; 413feabd6cfSGreg Kurz } 41460ce86c7SWei Liu 4158440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 41660ce86c7SWei Liu { 41760ce86c7SWei Liu int reclaim_count = 0; 41860ce86c7SWei Liu V9fsState *s = pdu->s; 419*81f9766bSGreg Kurz V9fsFidState *f; 420*81f9766bSGreg Kurz QSLIST_HEAD(, V9fsFidState) reclaim_list = 421*81f9766bSGreg Kurz QSLIST_HEAD_INITIALIZER(reclaim_list); 42260ce86c7SWei Liu 423feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 42460ce86c7SWei Liu /* 42560ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 42660ce86c7SWei Liu * for them and skip them. Also skip fids 42760ce86c7SWei Liu * currently being operated on. 42860ce86c7SWei Liu */ 42960ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 43060ce86c7SWei Liu continue; 43160ce86c7SWei Liu } 43260ce86c7SWei Liu /* 43360ce86c7SWei Liu * if it is a recently referenced fid 43460ce86c7SWei Liu * we leave the fid untouched and clear the 43560ce86c7SWei Liu * reference bit. We come back to it later 43660ce86c7SWei Liu * in the next iteration. (a simple LRU without 43760ce86c7SWei Liu * moving list elements around) 43860ce86c7SWei Liu */ 43960ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 44060ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 44160ce86c7SWei Liu continue; 44260ce86c7SWei Liu } 44360ce86c7SWei Liu /* 44460ce86c7SWei Liu * Add fids to reclaim list. 44560ce86c7SWei Liu */ 44660ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 44760ce86c7SWei Liu if (f->fs.fd != -1) { 44860ce86c7SWei Liu /* 44960ce86c7SWei Liu * Up the reference count so that 45060ce86c7SWei Liu * a clunk request won't free this fid 45160ce86c7SWei Liu */ 45260ce86c7SWei Liu f->ref++; 453*81f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 45460ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 45560ce86c7SWei Liu f->fs.fd = -1; 45660ce86c7SWei Liu reclaim_count++; 45760ce86c7SWei Liu } 45860ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 459f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 46060ce86c7SWei Liu /* 46160ce86c7SWei Liu * Up the reference count so that 46260ce86c7SWei Liu * a clunk request won't free this fid 46360ce86c7SWei Liu */ 46460ce86c7SWei Liu f->ref++; 465*81f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 466f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 467f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 46860ce86c7SWei Liu reclaim_count++; 46960ce86c7SWei Liu } 47060ce86c7SWei Liu } 47160ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 47260ce86c7SWei Liu break; 47360ce86c7SWei Liu } 47460ce86c7SWei Liu } 47560ce86c7SWei Liu /* 47660ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 47760ce86c7SWei Liu * are already clunked. 47860ce86c7SWei Liu */ 479*81f9766bSGreg Kurz while (!QSLIST_EMPTY(&reclaim_list)) { 480*81f9766bSGreg Kurz f = QSLIST_FIRST(&reclaim_list); 481*81f9766bSGreg Kurz QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); 48260ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 48360ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 48460ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 48560ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 48660ce86c7SWei Liu } 48760ce86c7SWei Liu /* 48860ce86c7SWei Liu * Now drop the fid reference, free it 48960ce86c7SWei Liu * if clunked. 49060ce86c7SWei Liu */ 49160ce86c7SWei Liu put_fid(pdu, f); 49260ce86c7SWei Liu } 49360ce86c7SWei Liu } 49460ce86c7SWei Liu 4958440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 49660ce86c7SWei Liu { 49760ce86c7SWei Liu int err; 49860ce86c7SWei Liu V9fsState *s = pdu->s; 49920b7f45bSGreg Kurz V9fsFidState *fidp, *fidp_next; 50060ce86c7SWei Liu 50120b7f45bSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 50220b7f45bSGreg Kurz if (!fidp) { 50320b7f45bSGreg Kurz return 0; 50460ce86c7SWei Liu } 50520b7f45bSGreg Kurz 50620b7f45bSGreg Kurz /* 50720b7f45bSGreg Kurz * v9fs_reopen_fid() can yield : a reference on the fid must be held 50820b7f45bSGreg Kurz * to ensure its pointer remains valid and we can safely pass it to 50920b7f45bSGreg Kurz * QSIMPLEQ_NEXT(). The corresponding put_fid() can also yield so 51020b7f45bSGreg Kurz * we must keep a reference on the next fid as well. So the logic here 51120b7f45bSGreg Kurz * is to get a reference on a fid and only put it back during the next 51220b7f45bSGreg Kurz * iteration after we could get a reference on the next fid. Start with 51320b7f45bSGreg Kurz * the first one. 51420b7f45bSGreg Kurz */ 51520b7f45bSGreg Kurz for (fidp->ref++; fidp; fidp = fidp_next) { 51620b7f45bSGreg Kurz if (fidp->path.size == path->size && 51720b7f45bSGreg Kurz !memcmp(fidp->path.data, path->data, path->size)) { 51860ce86c7SWei Liu /* Mark the fid non reclaimable. */ 51960ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 52060ce86c7SWei Liu 52160ce86c7SWei Liu /* reopen the file/dir if already closed */ 52260ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 52360ce86c7SWei Liu if (err < 0) { 52420b7f45bSGreg Kurz put_fid(pdu, fidp); 525267fcadfSGreg Kurz return err; 52660ce86c7SWei Liu } 52720b7f45bSGreg Kurz } 52820b7f45bSGreg Kurz 52920b7f45bSGreg Kurz fidp_next = QSIMPLEQ_NEXT(fidp, next); 53020b7f45bSGreg Kurz 53120b7f45bSGreg Kurz if (fidp_next) { 53260ce86c7SWei Liu /* 53320b7f45bSGreg Kurz * Ensure the next fid survives a potential clunk request during 53420b7f45bSGreg Kurz * put_fid() below and v9fs_reopen_fid() in the next iteration. 53560ce86c7SWei Liu */ 53620b7f45bSGreg Kurz fidp_next->ref++; 53760ce86c7SWei Liu } 53820b7f45bSGreg Kurz 53920b7f45bSGreg Kurz /* We're done with this fid */ 54020b7f45bSGreg Kurz put_fid(pdu, fidp); 54160ce86c7SWei Liu } 54220b7f45bSGreg Kurz 54360ce86c7SWei Liu return 0; 54460ce86c7SWei Liu } 54560ce86c7SWei Liu 5468440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 54760ce86c7SWei Liu { 54860ce86c7SWei Liu V9fsState *s = pdu->s; 54979decce3SGreg Kurz V9fsFidState *fidp; 55060ce86c7SWei Liu 55160ce86c7SWei Liu /* Free all fids */ 552feabd6cfSGreg Kurz while (!QSIMPLEQ_EMPTY(&s->fid_list)) { 5536d54af0eSGreg Kurz /* Get fid */ 554feabd6cfSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 5556d54af0eSGreg Kurz fidp->ref++; 55660ce86c7SWei Liu 5576d54af0eSGreg Kurz /* Clunk fid */ 558feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 5592e53160fSGreg Kurz fidp->clunked = true; 5606d54af0eSGreg Kurz 5616d54af0eSGreg Kurz put_fid(pdu, fidp); 56260ce86c7SWei Liu } 56360ce86c7SWei Liu } 56460ce86c7SWei Liu 56560ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 56660ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 56760ce86c7SWei Liu 56860ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 56960ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 57060ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 57160ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 57260ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 57360ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 57460ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 57560ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 57660ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 57760ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 57860ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 57960ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 58060ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 58160ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 58260ce86c7SWei Liu 58360ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 58460ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 58560ce86c7SWei Liu P9_STAT_MODE_LINK | \ 58660ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 58760ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 58860ce86c7SWei Liu P9_STAT_MODE_SOCKET) 58960ce86c7SWei Liu 5906b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 5916b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 5926b6aa828SChristian Schoenebeck { 5936b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 5946b6aa828SChristian Schoenebeck } 5956b6aa828SChristian Schoenebeck 5966b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 5976b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 5986b6aa828SChristian Schoenebeck { 5996b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 6006b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 6016b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 6026b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 6036b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 6046b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 6056b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 6066b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 6076b6aa828SChristian Schoenebeck } 6086b6aa828SChristian Schoenebeck 6096b6aa828SChristian Schoenebeck /** 6106b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 6116b6aa828SChristian Schoenebeck * 6126b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6136b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6146b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6156b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6166b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6176b6aa828SChristian Schoenebeck * 6186b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6196b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6206b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6216b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6226b6aa828SChristian Schoenebeck * 6236b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6246b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6256b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6266b6aa828SChristian Schoenebeck */ 6276b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6286b6aa828SChristian Schoenebeck 6296b6aa828SChristian Schoenebeck /** 6306b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6316b6aa828SChristian Schoenebeck * 6326b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6336b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6346b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6356b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6366b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6376b6aa828SChristian Schoenebeck * 6386b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6396b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6406b6aa828SChristian Schoenebeck * 6416b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6426b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6436b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6446b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6456b6aa828SChristian Schoenebeck */ 6466b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6476b6aa828SChristian Schoenebeck { 6486b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6496b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6506b6aa828SChristian Schoenebeck return (VariLenAffix) { 6516b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6526b6aa828SChristian Schoenebeck .value = value, 6536b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6546b6aa828SChristian Schoenebeck }; 6556b6aa828SChristian Schoenebeck } 6566b6aa828SChristian Schoenebeck 6576b6aa828SChristian Schoenebeck /** 6586b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6596b6aa828SChristian Schoenebeck * 6606b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6616b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6626b6aa828SChristian Schoenebeck * after the conversion. 6636b6aa828SChristian Schoenebeck * 6646b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6656b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6666b6aa828SChristian Schoenebeck * versa). 6676b6aa828SChristian Schoenebeck */ 6686b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6696b6aa828SChristian Schoenebeck { 6706b6aa828SChristian Schoenebeck return (VariLenAffix) { 6716b6aa828SChristian Schoenebeck .type = 6726b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6736b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6746b6aa828SChristian Schoenebeck .value = 6756b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6766b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6776b6aa828SChristian Schoenebeck .bits = affix->bits 6786b6aa828SChristian Schoenebeck }; 6796b6aa828SChristian Schoenebeck } 6806b6aa828SChristian Schoenebeck 6816b6aa828SChristian Schoenebeck /** 6826b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6836b6aa828SChristian Schoenebeck * 6846b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6856b6aa828SChristian Schoenebeck * 6866b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6876b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6886b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 6896b6aa828SChristian Schoenebeck * 6906b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 6916b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6926b6aa828SChristian Schoenebeck */ 6936b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 6946b6aa828SChristian Schoenebeck { 6956b6aa828SChristian Schoenebeck VariLenAffix prefix; 6966b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 6976b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 6986b6aa828SChristian Schoenebeck } 6996b6aa828SChristian Schoenebeck 7001a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 7011a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 7021a6ed33cSAntonios Motakis { 7031a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 7041a6ed33cSAntonios Motakis } 7051a6ed33cSAntonios Motakis 706f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 707f3fe4a2dSAntonios Motakis { 708f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 709f3fe4a2dSAntonios Motakis } 710f3fe4a2dSAntonios Motakis 7116b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7126b6aa828SChristian Schoenebeck { 7136b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7146b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7156b6aa828SChristian Schoenebeck } 7166b6aa828SChristian Schoenebeck 7176b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7181a6ed33cSAntonios Motakis { 7191a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7201a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7211a6ed33cSAntonios Motakis } 7221a6ed33cSAntonios Motakis 7236b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 724f3fe4a2dSAntonios Motakis { 725f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 726f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 727f3fe4a2dSAntonios Motakis } 728f3fe4a2dSAntonios Motakis 729f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7301a6ed33cSAntonios Motakis { 7311a6ed33cSAntonios Motakis g_free(p); 7321a6ed33cSAntonios Motakis } 7331a6ed33cSAntonios Motakis 734f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7351a6ed33cSAntonios Motakis { 7361a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7371a6ed33cSAntonios Motakis return; 7381a6ed33cSAntonios Motakis } 739f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7401a6ed33cSAntonios Motakis qht_destroy(ht); 7411a6ed33cSAntonios Motakis } 7421a6ed33cSAntonios Motakis 7436b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7446b6aa828SChristian Schoenebeck { 7456b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7466b6aa828SChristian Schoenebeck } 7476b6aa828SChristian Schoenebeck 7481a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7491a6ed33cSAntonios Motakis { 7506b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7511a6ed33cSAntonios Motakis } 7521a6ed33cSAntonios Motakis 753f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 754f3fe4a2dSAntonios Motakis { 7556b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 756f3fe4a2dSAntonios Motakis } 757f3fe4a2dSAntonios Motakis 7586b6aa828SChristian Schoenebeck /* 7596b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7606b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7616b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7626b6aa828SChristian Schoenebeck * 7636b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7646b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7656b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7666b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7676b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7686b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7696b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7706b6aa828SChristian Schoenebeck */ 7716b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7726b6aa828SChristian Schoenebeck { 7736b6aa828SChristian Schoenebeck QpdEntry lookup = { 7746b6aa828SChristian Schoenebeck .dev = dev 7756b6aa828SChristian Schoenebeck }, *val; 7766b6aa828SChristian Schoenebeck uint32_t hash = dev; 7776b6aa828SChristian Schoenebeck VariLenAffix affix; 7786b6aa828SChristian Schoenebeck 7796b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7806b6aa828SChristian Schoenebeck if (!val) { 7816b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7826b6aa828SChristian Schoenebeck *val = lookup; 7836b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7846b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7856b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7866b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7876b6aa828SChristian Schoenebeck } 7886b6aa828SChristian Schoenebeck return val->prefix_bits; 7896b6aa828SChristian Schoenebeck } 7906b6aa828SChristian Schoenebeck 7916b6aa828SChristian Schoenebeck /** 7926b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 7936b6aa828SChristian Schoenebeck * 7946b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 7956b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 7966b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 7976b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 7986b6aa828SChristian Schoenebeck * guest. 7996b6aa828SChristian Schoenebeck * 8006b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 8016b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 8026b6aa828SChristian Schoenebeck * expected ever to be used at all though. 8036b6aa828SChristian Schoenebeck * 8046b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 8056b6aa828SChristian Schoenebeck * 8066b6aa828SChristian Schoenebeck */ 807f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 808f3fe4a2dSAntonios Motakis uint64_t *path) 809f3fe4a2dSAntonios Motakis { 810f3fe4a2dSAntonios Motakis QpfEntry lookup = { 811f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 812f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 813f3fe4a2dSAntonios Motakis }, *val; 814f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8156b6aa828SChristian Schoenebeck VariLenAffix affix; 816f3fe4a2dSAntonios Motakis 817f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 818f3fe4a2dSAntonios Motakis 819f3fe4a2dSAntonios Motakis if (!val) { 820f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 821f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 822f3fe4a2dSAntonios Motakis error_report_once( 823f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 824f3fe4a2dSAntonios Motakis "host to guest." 825f3fe4a2dSAntonios Motakis ); 826f3fe4a2dSAntonios Motakis return -ENFILE; 827f3fe4a2dSAntonios Motakis } 828f3fe4a2dSAntonios Motakis 829f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 830f3fe4a2dSAntonios Motakis *val = lookup; 831f3fe4a2dSAntonios Motakis 832f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8336b6aa828SChristian Schoenebeck affix = affixForIndex( 8346b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8356b6aa828SChristian Schoenebeck ); 8366b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8376b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 838f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 839f3fe4a2dSAntonios Motakis } 840f3fe4a2dSAntonios Motakis 841f3fe4a2dSAntonios Motakis *path = val->path; 842f3fe4a2dSAntonios Motakis return 0; 843f3fe4a2dSAntonios Motakis } 844f3fe4a2dSAntonios Motakis 8456b6aa828SChristian Schoenebeck /** 8466b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8471a6ed33cSAntonios Motakis * 8486b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8496b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8506b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8516b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8526b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8536b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8546b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8556b6aa828SChristian Schoenebeck * that is). 8566b6aa828SChristian Schoenebeck * 8576b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8586b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8596b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8606b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8616b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8626b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8636b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8646b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8656b6aa828SChristian Schoenebeck * 8666b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8676b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8686b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8696b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8706b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8716b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8726b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8736b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8746b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8756b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8766b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8776b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8786b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8796b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8806b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8816b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8826b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8831a6ed33cSAntonios Motakis */ 8846b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8851a6ed33cSAntonios Motakis uint64_t *path) 8861a6ed33cSAntonios Motakis { 8876b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8881a6ed33cSAntonios Motakis QppEntry lookup = { 8891a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 8906b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 8911a6ed33cSAntonios Motakis }, *val; 8921a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 8931a6ed33cSAntonios Motakis 8941a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 8951a6ed33cSAntonios Motakis 8961a6ed33cSAntonios Motakis if (!val) { 8976b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 8986b6aa828SChristian Schoenebeck /* we ran out of affixes */ 899f3fe4a2dSAntonios Motakis warn_report_once( 900f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 9011a6ed33cSAntonios Motakis ); 9021a6ed33cSAntonios Motakis return -ENFILE; 9031a6ed33cSAntonios Motakis } 9041a6ed33cSAntonios Motakis 9051a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 9061a6ed33cSAntonios Motakis *val = lookup; 9071a6ed33cSAntonios Motakis 9086b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 9096b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 9106b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 9111a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9121a6ed33cSAntonios Motakis } 9136b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9146b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9151a6ed33cSAntonios Motakis return 0; 9161a6ed33cSAntonios Motakis } 9171a6ed33cSAntonios Motakis 9183b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 91960ce86c7SWei Liu { 9201a6ed33cSAntonios Motakis int err; 92160ce86c7SWei Liu size_t size; 92260ce86c7SWei Liu 9231a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9241a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9256b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 926f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 927f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 928f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 929f3fe4a2dSAntonios Motakis } 9301a6ed33cSAntonios Motakis if (err) { 9311a6ed33cSAntonios Motakis return err; 9321a6ed33cSAntonios Motakis } 9331a6ed33cSAntonios Motakis } else { 9343b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9351a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9361a6ed33cSAntonios Motakis error_report_once( 9371a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9381a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9391a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9401a6ed33cSAntonios Motakis "effective." 9411a6ed33cSAntonios Motakis ); 9421a6ed33cSAntonios Motakis return -ENODEV; 9431a6ed33cSAntonios Motakis } else { 9443b5ee9e8SAntonios Motakis warn_report_once( 9453b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9463b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9471a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9481a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9491a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9503b5ee9e8SAntonios Motakis ); 9513b5ee9e8SAntonios Motakis } 9521a6ed33cSAntonios Motakis } 95360ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 95460ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 95560ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9561a6ed33cSAntonios Motakis } 9571a6ed33cSAntonios Motakis 95860ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 95960ce86c7SWei Liu qidp->type = 0; 96060ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 96160ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 96260ce86c7SWei Liu } 96360ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 96460ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 96560ce86c7SWei Liu } 9663b5ee9e8SAntonios Motakis 9673b5ee9e8SAntonios Motakis return 0; 96860ce86c7SWei Liu } 96960ce86c7SWei Liu 9708440e22eSGreg Kurz static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, 9718440e22eSGreg Kurz V9fsQID *qidp) 97260ce86c7SWei Liu { 97360ce86c7SWei Liu struct stat stbuf; 97460ce86c7SWei Liu int err; 97560ce86c7SWei Liu 97660ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 97760ce86c7SWei Liu if (err < 0) { 97860ce86c7SWei Liu return err; 97960ce86c7SWei Liu } 9803b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, qidp); 9813b5ee9e8SAntonios Motakis if (err < 0) { 9823b5ee9e8SAntonios Motakis return err; 9833b5ee9e8SAntonios Motakis } 98460ce86c7SWei Liu return 0; 98560ce86c7SWei Liu } 98660ce86c7SWei Liu 98760ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 98860ce86c7SWei Liu { 98960ce86c7SWei Liu V9fsPDU *pdu = NULL; 99060ce86c7SWei Liu 99160ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 99260ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 99360ce86c7SWei Liu QLIST_REMOVE(pdu, next); 99460ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 99560ce86c7SWei Liu } 99660ce86c7SWei Liu return pdu; 99760ce86c7SWei Liu } 99860ce86c7SWei Liu 99960ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 100060ce86c7SWei Liu { 100160ce86c7SWei Liu V9fsState *s = pdu->s; 1002f74e27bfSGreg Kurz 1003f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 100460ce86c7SWei Liu QLIST_REMOVE(pdu, next); 100560ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 100660ce86c7SWei Liu } 100760ce86c7SWei Liu 10088440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 100960ce86c7SWei Liu { 101060ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 101160ce86c7SWei Liu V9fsState *s = pdu->s; 101206a37db7SGreg Kurz int ret; 101360ce86c7SWei Liu 1014fc78d5eeSKeno Fischer /* 1015fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1016fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1017fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1018fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1019fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1020fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1021fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1022fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1023fc78d5eeSKeno Fischer * transmission of the reply. 1024fc78d5eeSKeno Fischer */ 1025fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1026fc78d5eeSKeno Fischer if (discard) { 1027fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1028fc78d5eeSKeno Fischer pdu->size = 0; 1029fc78d5eeSKeno Fischer goto out_notify; 1030fc78d5eeSKeno Fischer } 1031fc78d5eeSKeno Fischer 103260ce86c7SWei Liu if (len < 0) { 103360ce86c7SWei Liu int err = -len; 103460ce86c7SWei Liu len = 7; 103560ce86c7SWei Liu 103660ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 103760ce86c7SWei Liu V9fsString str; 103860ce86c7SWei Liu 103960ce86c7SWei Liu str.data = strerror(err); 104060ce86c7SWei Liu str.size = strlen(str.data); 104160ce86c7SWei Liu 104206a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 104306a37db7SGreg Kurz if (ret < 0) { 104406a37db7SGreg Kurz goto out_notify; 104506a37db7SGreg Kurz } 104606a37db7SGreg Kurz len += ret; 104760ce86c7SWei Liu id = P9_RERROR; 104860ce86c7SWei Liu } 104960ce86c7SWei Liu 105006a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 105106a37db7SGreg Kurz if (ret < 0) { 105206a37db7SGreg Kurz goto out_notify; 105306a37db7SGreg Kurz } 105406a37db7SGreg Kurz len += ret; 105560ce86c7SWei Liu 105660ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 105760ce86c7SWei Liu id = P9_RLERROR; 105860ce86c7SWei Liu } 105960ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 106060ce86c7SWei Liu } 106160ce86c7SWei Liu 106260ce86c7SWei Liu /* fill out the header */ 106306a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 106406a37db7SGreg Kurz goto out_notify; 106506a37db7SGreg Kurz } 106660ce86c7SWei Liu 106760ce86c7SWei Liu /* keep these in sync */ 106860ce86c7SWei Liu pdu->size = len; 106960ce86c7SWei Liu pdu->id = id; 107060ce86c7SWei Liu 107106a37db7SGreg Kurz out_notify: 1072a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 107360ce86c7SWei Liu 107460ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1075f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 107660ce86c7SWei Liu pdu_free(pdu); 107760ce86c7SWei Liu } 1078f74e27bfSGreg Kurz } 107960ce86c7SWei Liu 108060ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 108160ce86c7SWei Liu { 108260ce86c7SWei Liu mode_t ret; 108360ce86c7SWei Liu 108460ce86c7SWei Liu ret = mode & 0777; 108560ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 108660ce86c7SWei Liu ret |= S_IFDIR; 108760ce86c7SWei Liu } 108860ce86c7SWei Liu 108960ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 109060ce86c7SWei Liu ret |= S_IFLNK; 109160ce86c7SWei Liu } 109260ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 109360ce86c7SWei Liu ret |= S_IFSOCK; 109460ce86c7SWei Liu } 109560ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 109660ce86c7SWei Liu ret |= S_IFIFO; 109760ce86c7SWei Liu } 109860ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 109960ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 110060ce86c7SWei Liu ret |= S_IFCHR; 110160ce86c7SWei Liu } else { 110260ce86c7SWei Liu ret |= S_IFBLK; 110360ce86c7SWei Liu } 110460ce86c7SWei Liu } 110560ce86c7SWei Liu 110660ce86c7SWei Liu if (!(ret & ~0777)) { 110760ce86c7SWei Liu ret |= S_IFREG; 110860ce86c7SWei Liu } 110960ce86c7SWei Liu 111060ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 111160ce86c7SWei Liu ret |= S_ISUID; 111260ce86c7SWei Liu } 111360ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 111460ce86c7SWei Liu ret |= S_ISGID; 111560ce86c7SWei Liu } 111660ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 111760ce86c7SWei Liu ret |= S_ISVTX; 111860ce86c7SWei Liu } 111960ce86c7SWei Liu 112060ce86c7SWei Liu return ret; 112160ce86c7SWei Liu } 112260ce86c7SWei Liu 112360ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 112460ce86c7SWei Liu { 112560ce86c7SWei Liu if (stat->type == -1 && 112660ce86c7SWei Liu stat->dev == -1 && 112787032833SAntonios Motakis stat->qid.type == 0xff && 112887032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 112987032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 113060ce86c7SWei Liu stat->mode == -1 && 113160ce86c7SWei Liu stat->atime == -1 && 113260ce86c7SWei Liu stat->mtime == -1 && 113360ce86c7SWei Liu stat->length == -1 && 113460ce86c7SWei Liu !stat->name.size && 113560ce86c7SWei Liu !stat->uid.size && 113660ce86c7SWei Liu !stat->gid.size && 113760ce86c7SWei Liu !stat->muid.size && 113860ce86c7SWei Liu stat->n_uid == -1 && 113960ce86c7SWei Liu stat->n_gid == -1 && 114060ce86c7SWei Liu stat->n_muid == -1) { 114160ce86c7SWei Liu return 1; 114260ce86c7SWei Liu } 114360ce86c7SWei Liu 114460ce86c7SWei Liu return 0; 114560ce86c7SWei Liu } 114660ce86c7SWei Liu 114760ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 114860ce86c7SWei Liu { 114960ce86c7SWei Liu v9fs_string_init(&stat->name); 115060ce86c7SWei Liu v9fs_string_init(&stat->uid); 115160ce86c7SWei Liu v9fs_string_init(&stat->gid); 115260ce86c7SWei Liu v9fs_string_init(&stat->muid); 115360ce86c7SWei Liu v9fs_string_init(&stat->extension); 115460ce86c7SWei Liu } 115560ce86c7SWei Liu 115660ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 115760ce86c7SWei Liu { 115860ce86c7SWei Liu v9fs_string_free(&stat->name); 115960ce86c7SWei Liu v9fs_string_free(&stat->uid); 116060ce86c7SWei Liu v9fs_string_free(&stat->gid); 116160ce86c7SWei Liu v9fs_string_free(&stat->muid); 116260ce86c7SWei Liu v9fs_string_free(&stat->extension); 116360ce86c7SWei Liu } 116460ce86c7SWei Liu 116560ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 116660ce86c7SWei Liu { 116760ce86c7SWei Liu uint32_t mode; 116860ce86c7SWei Liu 116960ce86c7SWei Liu mode = stbuf->st_mode & 0777; 117060ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 117160ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 117260ce86c7SWei Liu } 117360ce86c7SWei Liu 117460ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 117560ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 117660ce86c7SWei Liu } 117760ce86c7SWei Liu 117860ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 117960ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 118060ce86c7SWei Liu } 118160ce86c7SWei Liu 118260ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 118360ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 118460ce86c7SWei Liu } 118560ce86c7SWei Liu 118660ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 118760ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 118860ce86c7SWei Liu } 118960ce86c7SWei Liu 119060ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 119160ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 119260ce86c7SWei Liu } 119360ce86c7SWei Liu 119460ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 119560ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 119660ce86c7SWei Liu } 119760ce86c7SWei Liu 119860ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 119960ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 120060ce86c7SWei Liu } 120160ce86c7SWei Liu 120260ce86c7SWei Liu return mode; 120360ce86c7SWei Liu } 120460ce86c7SWei Liu 12056069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 12066069537fSJan Dakinevich const char *basename, 120760ce86c7SWei Liu const struct stat *stbuf, 120860ce86c7SWei Liu V9fsStat *v9stat) 120960ce86c7SWei Liu { 121060ce86c7SWei Liu int err; 121160ce86c7SWei Liu 121260ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 121360ce86c7SWei Liu 12143b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12153b5ee9e8SAntonios Motakis if (err < 0) { 12163b5ee9e8SAntonios Motakis return err; 12173b5ee9e8SAntonios Motakis } 121860ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 121960ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 122060ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 122160ce86c7SWei Liu v9stat->length = stbuf->st_size; 122260ce86c7SWei Liu 1223abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1224abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1225abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 122660ce86c7SWei Liu 122760ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 122860ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 122960ce86c7SWei Liu v9stat->n_muid = 0; 123060ce86c7SWei Liu 1231abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 123260ce86c7SWei Liu 123360ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12346069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 123560ce86c7SWei Liu if (err < 0) { 123660ce86c7SWei Liu return err; 123760ce86c7SWei Liu } 123860ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 123960ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 124060ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 124160ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 124260ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 124360ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 124460ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 124560ce86c7SWei Liu } 124660ce86c7SWei Liu 12476069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 124860ce86c7SWei Liu 124960ce86c7SWei Liu v9stat->size = 61 + 125060ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 125160ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 125260ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 125360ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 125460ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 125560ce86c7SWei Liu return 0; 125660ce86c7SWei Liu } 125760ce86c7SWei Liu 125860ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 125960ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 126060ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 126160ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 126260ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 126360ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 126460ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 126560ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 126660ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 126760ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 126860ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 126960ce86c7SWei Liu 127060ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 127160ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 127260ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 127360ce86c7SWei Liu 127460ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 127560ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 127660ce86c7SWei Liu 127760ce86c7SWei Liu 12783b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 127960ce86c7SWei Liu V9fsStatDotl *v9lstat) 128060ce86c7SWei Liu { 128160ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 128260ce86c7SWei Liu 128360ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 128460ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 128560ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 128660ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 128760ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 128860ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 128960ce86c7SWei Liu v9lstat->st_blksize = stbuf->st_blksize; 129060ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 129160ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 129260ce86c7SWei Liu v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 129360ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 129460ce86c7SWei Liu v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 129560ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 129660ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 129760ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 129860ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 129960ce86c7SWei Liu 13003b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 130160ce86c7SWei Liu } 130260ce86c7SWei Liu 130360ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 130460ce86c7SWei Liu { 130560ce86c7SWei Liu int i; 130660ce86c7SWei Liu 130760ce86c7SWei Liu printf("sg[%d]: {", cnt); 130860ce86c7SWei Liu for (i = 0; i < cnt; i++) { 130960ce86c7SWei Liu if (i) { 131060ce86c7SWei Liu printf(", "); 131160ce86c7SWei Liu } 131260ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 131360ce86c7SWei Liu } 131460ce86c7SWei Liu printf("}\n"); 131560ce86c7SWei Liu } 131660ce86c7SWei Liu 131760ce86c7SWei Liu /* Will call this only for path name based fid */ 131860ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 131960ce86c7SWei Liu { 132060ce86c7SWei Liu V9fsPath str; 132160ce86c7SWei Liu v9fs_path_init(&str); 132260ce86c7SWei Liu v9fs_path_copy(&str, dst); 1323e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 132460ce86c7SWei Liu v9fs_path_free(&str); 132560ce86c7SWei Liu } 132660ce86c7SWei Liu 132760ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 132860ce86c7SWei Liu { 132960ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 133060ce86c7SWei Liu } 133160ce86c7SWei Liu 13328440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 133360ce86c7SWei Liu { 133460ce86c7SWei Liu ssize_t err; 133560ce86c7SWei Liu V9fsPDU *pdu = opaque; 133660ce86c7SWei Liu V9fsState *s = pdu->s; 133760ce86c7SWei Liu V9fsString version; 133860ce86c7SWei Liu size_t offset = 7; 133960ce86c7SWei Liu 134060ce86c7SWei Liu v9fs_string_init(&version); 134160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 134260ce86c7SWei Liu if (err < 0) { 134360ce86c7SWei Liu goto out; 134460ce86c7SWei Liu } 134560ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 134660ce86c7SWei Liu 134760ce86c7SWei Liu virtfs_reset(pdu); 134860ce86c7SWei Liu 134960ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 135060ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 135160ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 135260ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 135360ce86c7SWei Liu } else { 135460ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1355e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1356e16453a3SChristian Schoenebeck goto marshal; 135760ce86c7SWei Liu } 135860ce86c7SWei Liu 1359e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1360e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1361e16453a3SChristian Schoenebeck error_report( 1362e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1363e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1364e16453a3SChristian Schoenebeck ); 1365e16453a3SChristian Schoenebeck goto out; 1366e16453a3SChristian Schoenebeck } 1367e16453a3SChristian Schoenebeck 136862777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1369c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 137062777d82SChristian Schoenebeck warn_report_once( 137162777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 137262777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 137362777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 137462777d82SChristian Schoenebeck ); 137562777d82SChristian Schoenebeck } 137662777d82SChristian Schoenebeck 1377e16453a3SChristian Schoenebeck marshal: 137860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 137960ce86c7SWei Liu if (err < 0) { 138060ce86c7SWei Liu goto out; 138160ce86c7SWei Liu } 1382403a905bSPhilippe Mathieu-Daudé err += offset; 138360ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 138460ce86c7SWei Liu out: 1385403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 138660ce86c7SWei Liu v9fs_string_free(&version); 138760ce86c7SWei Liu } 138860ce86c7SWei Liu 13898440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 139060ce86c7SWei Liu { 139160ce86c7SWei Liu V9fsPDU *pdu = opaque; 139260ce86c7SWei Liu V9fsState *s = pdu->s; 139360ce86c7SWei Liu int32_t fid, afid, n_uname; 139460ce86c7SWei Liu V9fsString uname, aname; 139560ce86c7SWei Liu V9fsFidState *fidp; 139660ce86c7SWei Liu size_t offset = 7; 139760ce86c7SWei Liu V9fsQID qid; 139860ce86c7SWei Liu ssize_t err; 139960ce86c7SWei Liu 140060ce86c7SWei Liu v9fs_string_init(&uname); 140160ce86c7SWei Liu v9fs_string_init(&aname); 140260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 140360ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 140460ce86c7SWei Liu if (err < 0) { 140560ce86c7SWei Liu goto out_nofid; 140660ce86c7SWei Liu } 140760ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 140860ce86c7SWei Liu 140960ce86c7SWei Liu fidp = alloc_fid(s, fid); 141060ce86c7SWei Liu if (fidp == NULL) { 141160ce86c7SWei Liu err = -EINVAL; 141260ce86c7SWei Liu goto out_nofid; 141360ce86c7SWei Liu } 141460ce86c7SWei Liu fidp->uid = n_uname; 141560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 141660ce86c7SWei Liu if (err < 0) { 141760ce86c7SWei Liu err = -EINVAL; 141860ce86c7SWei Liu clunk_fid(s, fid); 141960ce86c7SWei Liu goto out; 142060ce86c7SWei Liu } 142160ce86c7SWei Liu err = fid_to_qid(pdu, fidp, &qid); 142260ce86c7SWei Liu if (err < 0) { 142360ce86c7SWei Liu err = -EINVAL; 142460ce86c7SWei Liu clunk_fid(s, fid); 142560ce86c7SWei Liu goto out; 142660ce86c7SWei Liu } 1427fe44dc91SAshijeet Acharya 1428fe44dc91SAshijeet Acharya /* 1429fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1430fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1431fe44dc91SAshijeet Acharya */ 1432fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1433fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1434fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1435fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14369261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14379261ef5eSMarkus Armbruster if (err < 0) { 1438fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1439fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1440fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1441fe44dc91SAshijeet Acharya goto out; 1442fe44dc91SAshijeet Acharya } 1443fe44dc91SAshijeet Acharya s->root_fid = fid; 1444fe44dc91SAshijeet Acharya } 1445fe44dc91SAshijeet Acharya 144660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 144760ce86c7SWei Liu if (err < 0) { 144860ce86c7SWei Liu clunk_fid(s, fid); 144960ce86c7SWei Liu goto out; 145060ce86c7SWei Liu } 145160ce86c7SWei Liu err += offset; 1452fe44dc91SAshijeet Acharya 145356f101ecSGreg Kurz memcpy(&s->root_qid, &qid, sizeof(qid)); 145460ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 145560ce86c7SWei Liu qid.type, qid.version, qid.path); 145660ce86c7SWei Liu out: 145760ce86c7SWei Liu put_fid(pdu, fidp); 145860ce86c7SWei Liu out_nofid: 145960ce86c7SWei Liu pdu_complete(pdu, err); 146060ce86c7SWei Liu v9fs_string_free(&uname); 146160ce86c7SWei Liu v9fs_string_free(&aname); 146260ce86c7SWei Liu } 146360ce86c7SWei Liu 14648440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 146560ce86c7SWei Liu { 146660ce86c7SWei Liu int32_t fid; 146760ce86c7SWei Liu V9fsStat v9stat; 146860ce86c7SWei Liu ssize_t err = 0; 146960ce86c7SWei Liu size_t offset = 7; 147060ce86c7SWei Liu struct stat stbuf; 147160ce86c7SWei Liu V9fsFidState *fidp; 147260ce86c7SWei Liu V9fsPDU *pdu = opaque; 14736069537fSJan Dakinevich char *basename; 147460ce86c7SWei Liu 147560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 147660ce86c7SWei Liu if (err < 0) { 147760ce86c7SWei Liu goto out_nofid; 147860ce86c7SWei Liu } 147960ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 148060ce86c7SWei Liu 148160ce86c7SWei Liu fidp = get_fid(pdu, fid); 148260ce86c7SWei Liu if (fidp == NULL) { 148360ce86c7SWei Liu err = -ENOENT; 148460ce86c7SWei Liu goto out_nofid; 148560ce86c7SWei Liu } 148660ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 148760ce86c7SWei Liu if (err < 0) { 148860ce86c7SWei Liu goto out; 148960ce86c7SWei Liu } 14906069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 14916069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 14926069537fSJan Dakinevich g_free(basename); 149360ce86c7SWei Liu if (err < 0) { 149460ce86c7SWei Liu goto out; 149560ce86c7SWei Liu } 149660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 149760ce86c7SWei Liu if (err < 0) { 149860ce86c7SWei Liu v9fs_stat_free(&v9stat); 149960ce86c7SWei Liu goto out; 150060ce86c7SWei Liu } 150160ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 150260ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 150360ce86c7SWei Liu err += offset; 150460ce86c7SWei Liu v9fs_stat_free(&v9stat); 150560ce86c7SWei Liu out: 150660ce86c7SWei Liu put_fid(pdu, fidp); 150760ce86c7SWei Liu out_nofid: 150860ce86c7SWei Liu pdu_complete(pdu, err); 150960ce86c7SWei Liu } 151060ce86c7SWei Liu 15118440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 151260ce86c7SWei Liu { 151360ce86c7SWei Liu int32_t fid; 151460ce86c7SWei Liu size_t offset = 7; 151560ce86c7SWei Liu ssize_t retval = 0; 151660ce86c7SWei Liu struct stat stbuf; 151760ce86c7SWei Liu V9fsFidState *fidp; 151860ce86c7SWei Liu uint64_t request_mask; 151960ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 152060ce86c7SWei Liu V9fsPDU *pdu = opaque; 152160ce86c7SWei Liu 152260ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 152360ce86c7SWei Liu if (retval < 0) { 152460ce86c7SWei Liu goto out_nofid; 152560ce86c7SWei Liu } 152660ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 152760ce86c7SWei Liu 152860ce86c7SWei Liu fidp = get_fid(pdu, fid); 152960ce86c7SWei Liu if (fidp == NULL) { 153060ce86c7SWei Liu retval = -ENOENT; 153160ce86c7SWei Liu goto out_nofid; 153260ce86c7SWei Liu } 153360ce86c7SWei Liu /* 153460ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 153560ce86c7SWei Liu * need to look at request_mask. 153660ce86c7SWei Liu */ 153760ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 153860ce86c7SWei Liu if (retval < 0) { 153960ce86c7SWei Liu goto out; 154060ce86c7SWei Liu } 15413b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15423b5ee9e8SAntonios Motakis if (retval < 0) { 15433b5ee9e8SAntonios Motakis goto out; 15443b5ee9e8SAntonios Motakis } 154560ce86c7SWei Liu 154660ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 154760ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 154860ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 154960ce86c7SWei Liu switch (retval) { 155060ce86c7SWei Liu case 0: 155160ce86c7SWei Liu /* we have valid st_gen: update result mask */ 155260ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 155360ce86c7SWei Liu break; 155460ce86c7SWei Liu case -EINTR: 155560ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 155660ce86c7SWei Liu goto out; 155760ce86c7SWei Liu default: 155860ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 155960ce86c7SWei Liu break; 156060ce86c7SWei Liu } 156160ce86c7SWei Liu } 156260ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 156360ce86c7SWei Liu if (retval < 0) { 156460ce86c7SWei Liu goto out; 156560ce86c7SWei Liu } 156660ce86c7SWei Liu retval += offset; 156760ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 156860ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 156960ce86c7SWei Liu v9stat_dotl.st_gid); 157060ce86c7SWei Liu out: 157160ce86c7SWei Liu put_fid(pdu, fidp); 157260ce86c7SWei Liu out_nofid: 157360ce86c7SWei Liu pdu_complete(pdu, retval); 157460ce86c7SWei Liu } 157560ce86c7SWei Liu 157660ce86c7SWei Liu /* Attribute flags */ 157760ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 157860ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 157960ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 158060ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 158160ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 158260ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 158360ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 158460ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 158560ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 158660ce86c7SWei Liu 158760ce86c7SWei Liu #define P9_ATTR_MASK 127 158860ce86c7SWei Liu 15898440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 159060ce86c7SWei Liu { 159160ce86c7SWei Liu int err = 0; 159260ce86c7SWei Liu int32_t fid; 159360ce86c7SWei Liu V9fsFidState *fidp; 159460ce86c7SWei Liu size_t offset = 7; 159560ce86c7SWei Liu V9fsIattr v9iattr; 159660ce86c7SWei Liu V9fsPDU *pdu = opaque; 159760ce86c7SWei Liu 159860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 159960ce86c7SWei Liu if (err < 0) { 160060ce86c7SWei Liu goto out_nofid; 160160ce86c7SWei Liu } 160260ce86c7SWei Liu 16038f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16048f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16058f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16068f9c64bfSGreg Kurz 160760ce86c7SWei Liu fidp = get_fid(pdu, fid); 160860ce86c7SWei Liu if (fidp == NULL) { 160960ce86c7SWei Liu err = -EINVAL; 161060ce86c7SWei Liu goto out_nofid; 161160ce86c7SWei Liu } 161260ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 161360ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 161460ce86c7SWei Liu if (err < 0) { 161560ce86c7SWei Liu goto out; 161660ce86c7SWei Liu } 161760ce86c7SWei Liu } 161860ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 161960ce86c7SWei Liu struct timespec times[2]; 162060ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 162160ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 162260ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 162360ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 162460ce86c7SWei Liu } else { 162560ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 162660ce86c7SWei Liu } 162760ce86c7SWei Liu } else { 162860ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 162960ce86c7SWei Liu } 163060ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 163160ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 163260ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 163360ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 163460ce86c7SWei Liu } else { 163560ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 163660ce86c7SWei Liu } 163760ce86c7SWei Liu } else { 163860ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 163960ce86c7SWei Liu } 164060ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 164160ce86c7SWei Liu if (err < 0) { 164260ce86c7SWei Liu goto out; 164360ce86c7SWei Liu } 164460ce86c7SWei Liu } 164560ce86c7SWei Liu /* 164660ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 164760ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 164860ce86c7SWei Liu */ 164960ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 165060ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 165160ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 165260ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 165360ce86c7SWei Liu v9iattr.uid = -1; 165460ce86c7SWei Liu } 165560ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 165660ce86c7SWei Liu v9iattr.gid = -1; 165760ce86c7SWei Liu } 165860ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 165960ce86c7SWei Liu v9iattr.gid); 166060ce86c7SWei Liu if (err < 0) { 166160ce86c7SWei Liu goto out; 166260ce86c7SWei Liu } 166360ce86c7SWei Liu } 166460ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 166560ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 166660ce86c7SWei Liu if (err < 0) { 166760ce86c7SWei Liu goto out; 166860ce86c7SWei Liu } 166960ce86c7SWei Liu } 167060ce86c7SWei Liu err = offset; 16718f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 167260ce86c7SWei Liu out: 167360ce86c7SWei Liu put_fid(pdu, fidp); 167460ce86c7SWei Liu out_nofid: 167560ce86c7SWei Liu pdu_complete(pdu, err); 167660ce86c7SWei Liu } 167760ce86c7SWei Liu 167860ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 167960ce86c7SWei Liu { 168060ce86c7SWei Liu int i; 168160ce86c7SWei Liu ssize_t err; 168260ce86c7SWei Liu size_t offset = 7; 168360ce86c7SWei Liu 168460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 168560ce86c7SWei Liu if (err < 0) { 168660ce86c7SWei Liu return err; 168760ce86c7SWei Liu } 168860ce86c7SWei Liu offset += err; 168960ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 169060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 169160ce86c7SWei Liu if (err < 0) { 169260ce86c7SWei Liu return err; 169360ce86c7SWei Liu } 169460ce86c7SWei Liu offset += err; 169560ce86c7SWei Liu } 169660ce86c7SWei Liu return offset; 169760ce86c7SWei Liu } 169860ce86c7SWei Liu 1699fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1700fff39a7aSGreg Kurz { 1701fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1702fff39a7aSGreg Kurz } 1703fff39a7aSGreg Kurz 170456f101ecSGreg Kurz static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) 170556f101ecSGreg Kurz { 170656f101ecSGreg Kurz return 170756f101ecSGreg Kurz qid1->type != qid2->type || 170856f101ecSGreg Kurz qid1->version != qid2->version || 170956f101ecSGreg Kurz qid1->path != qid2->path; 171056f101ecSGreg Kurz } 171156f101ecSGreg Kurz 17128440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 171360ce86c7SWei Liu { 171460ce86c7SWei Liu int name_idx; 171560ce86c7SWei Liu V9fsQID *qids = NULL; 171660ce86c7SWei Liu int i, err = 0; 171760ce86c7SWei Liu V9fsPath dpath, path; 171860ce86c7SWei Liu uint16_t nwnames; 171960ce86c7SWei Liu struct stat stbuf; 172060ce86c7SWei Liu size_t offset = 7; 172160ce86c7SWei Liu int32_t fid, newfid; 172260ce86c7SWei Liu V9fsString *wnames = NULL; 172360ce86c7SWei Liu V9fsFidState *fidp; 172460ce86c7SWei Liu V9fsFidState *newfidp = NULL; 172560ce86c7SWei Liu V9fsPDU *pdu = opaque; 172660ce86c7SWei Liu V9fsState *s = pdu->s; 172756f101ecSGreg Kurz V9fsQID qid; 172860ce86c7SWei Liu 172960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 173060ce86c7SWei Liu if (err < 0) { 173160ce86c7SWei Liu pdu_complete(pdu, err); 173260ce86c7SWei Liu return ; 173360ce86c7SWei Liu } 173460ce86c7SWei Liu offset += err; 173560ce86c7SWei Liu 173660ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 173760ce86c7SWei Liu 173860ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 17391923923bSGreg Kurz wnames = g_new0(V9fsString, nwnames); 17401923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 174160ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 174260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 174360ce86c7SWei Liu if (err < 0) { 174460ce86c7SWei Liu goto out_nofid; 174560ce86c7SWei Liu } 1746fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1747fff39a7aSGreg Kurz err = -ENOENT; 1748fff39a7aSGreg Kurz goto out_nofid; 1749fff39a7aSGreg Kurz } 175060ce86c7SWei Liu offset += err; 175160ce86c7SWei Liu } 175260ce86c7SWei Liu } else if (nwnames > P9_MAXWELEM) { 175360ce86c7SWei Liu err = -EINVAL; 175460ce86c7SWei Liu goto out_nofid; 175560ce86c7SWei Liu } 175660ce86c7SWei Liu fidp = get_fid(pdu, fid); 175760ce86c7SWei Liu if (fidp == NULL) { 175860ce86c7SWei Liu err = -ENOENT; 175960ce86c7SWei Liu goto out_nofid; 176060ce86c7SWei Liu } 176156f101ecSGreg Kurz 176213fd08e6SGreg Kurz v9fs_path_init(&dpath); 176313fd08e6SGreg Kurz v9fs_path_init(&path); 176413fd08e6SGreg Kurz 176556f101ecSGreg Kurz err = fid_to_qid(pdu, fidp, &qid); 176656f101ecSGreg Kurz if (err < 0) { 176756f101ecSGreg Kurz goto out; 176856f101ecSGreg Kurz } 176956f101ecSGreg Kurz 177060ce86c7SWei Liu /* 177160ce86c7SWei Liu * Both dpath and path initially poin to fidp. 177260ce86c7SWei Liu * Needed to handle request with nwnames == 0 177360ce86c7SWei Liu */ 177460ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 177560ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 177660ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 177756f101ecSGreg Kurz if (not_same_qid(&pdu->s->root_qid, &qid) || 177856f101ecSGreg Kurz strcmp("..", wnames[name_idx].data)) { 177956f101ecSGreg Kurz err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, 178056f101ecSGreg Kurz &path); 178160ce86c7SWei Liu if (err < 0) { 178260ce86c7SWei Liu goto out; 178360ce86c7SWei Liu } 178456f101ecSGreg Kurz 178560ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 178660ce86c7SWei Liu if (err < 0) { 178760ce86c7SWei Liu goto out; 178860ce86c7SWei Liu } 17893b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 17903b5ee9e8SAntonios Motakis if (err < 0) { 17913b5ee9e8SAntonios Motakis goto out; 17923b5ee9e8SAntonios Motakis } 179360ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 179460ce86c7SWei Liu } 179556f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 179656f101ecSGreg Kurz } 179760ce86c7SWei Liu if (fid == newfid) { 179849dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 179949dd946bSGreg Kurz err = -EINVAL; 180049dd946bSGreg Kurz goto out; 180149dd946bSGreg Kurz } 18025b3c77aaSGreg Kurz v9fs_path_write_lock(s); 180360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 18045b3c77aaSGreg Kurz v9fs_path_unlock(s); 180560ce86c7SWei Liu } else { 180660ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 180760ce86c7SWei Liu if (newfidp == NULL) { 180860ce86c7SWei Liu err = -EINVAL; 180960ce86c7SWei Liu goto out; 181060ce86c7SWei Liu } 181160ce86c7SWei Liu newfidp->uid = fidp->uid; 181260ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 181360ce86c7SWei Liu } 181460ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 181560ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 181660ce86c7SWei Liu out: 181760ce86c7SWei Liu put_fid(pdu, fidp); 181860ce86c7SWei Liu if (newfidp) { 181960ce86c7SWei Liu put_fid(pdu, newfidp); 182060ce86c7SWei Liu } 182160ce86c7SWei Liu v9fs_path_free(&dpath); 182260ce86c7SWei Liu v9fs_path_free(&path); 182360ce86c7SWei Liu out_nofid: 182460ce86c7SWei Liu pdu_complete(pdu, err); 182560ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 182660ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 182760ce86c7SWei Liu v9fs_string_free(&wnames[name_idx]); 182860ce86c7SWei Liu } 182960ce86c7SWei Liu g_free(wnames); 183060ce86c7SWei Liu g_free(qids); 183160ce86c7SWei Liu } 183260ce86c7SWei Liu } 183360ce86c7SWei Liu 18348440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 183560ce86c7SWei Liu { 183660ce86c7SWei Liu struct statfs stbuf; 183760ce86c7SWei Liu int32_t iounit = 0; 183860ce86c7SWei Liu V9fsState *s = pdu->s; 183960ce86c7SWei Liu 184060ce86c7SWei Liu /* 184160ce86c7SWei Liu * iounit should be multiples of f_bsize (host filesystem block size 184260ce86c7SWei Liu * and as well as less than (client msize - P9_IOHDRSZ)) 184360ce86c7SWei Liu */ 184460ce86c7SWei Liu if (!v9fs_co_statfs(pdu, path, &stbuf)) { 184568d654daSDan Schatzberg if (stbuf.f_bsize) { 184660ce86c7SWei Liu iounit = stbuf.f_bsize; 184760ce86c7SWei Liu iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; 184860ce86c7SWei Liu } 184968d654daSDan Schatzberg } 185060ce86c7SWei Liu if (!iounit) { 185160ce86c7SWei Liu iounit = s->msize - P9_IOHDRSZ; 185260ce86c7SWei Liu } 185360ce86c7SWei Liu return iounit; 185460ce86c7SWei Liu } 185560ce86c7SWei Liu 18568440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 185760ce86c7SWei Liu { 185860ce86c7SWei Liu int flags; 185960ce86c7SWei Liu int32_t fid; 186060ce86c7SWei Liu int32_t mode; 186160ce86c7SWei Liu V9fsQID qid; 186260ce86c7SWei Liu int iounit = 0; 186360ce86c7SWei Liu ssize_t err = 0; 186460ce86c7SWei Liu size_t offset = 7; 186560ce86c7SWei Liu struct stat stbuf; 186660ce86c7SWei Liu V9fsFidState *fidp; 186760ce86c7SWei Liu V9fsPDU *pdu = opaque; 186860ce86c7SWei Liu V9fsState *s = pdu->s; 186960ce86c7SWei Liu 187060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 187160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 187260ce86c7SWei Liu } else { 187360ce86c7SWei Liu uint8_t modebyte; 187460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 187560ce86c7SWei Liu mode = modebyte; 187660ce86c7SWei Liu } 187760ce86c7SWei Liu if (err < 0) { 187860ce86c7SWei Liu goto out_nofid; 187960ce86c7SWei Liu } 188060ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 188160ce86c7SWei Liu 188260ce86c7SWei Liu fidp = get_fid(pdu, fid); 188360ce86c7SWei Liu if (fidp == NULL) { 188460ce86c7SWei Liu err = -ENOENT; 188560ce86c7SWei Liu goto out_nofid; 188660ce86c7SWei Liu } 188749dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 188849dd946bSGreg Kurz err = -EINVAL; 188949dd946bSGreg Kurz goto out; 189049dd946bSGreg Kurz } 189160ce86c7SWei Liu 189260ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 189360ce86c7SWei Liu if (err < 0) { 189460ce86c7SWei Liu goto out; 189560ce86c7SWei Liu } 18963b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18973b5ee9e8SAntonios Motakis if (err < 0) { 18983b5ee9e8SAntonios Motakis goto out; 18993b5ee9e8SAntonios Motakis } 190060ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 190160ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 190260ce86c7SWei Liu if (err < 0) { 190360ce86c7SWei Liu goto out; 190460ce86c7SWei Liu } 190560ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 190660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 190760ce86c7SWei Liu if (err < 0) { 190860ce86c7SWei Liu goto out; 190960ce86c7SWei Liu } 191060ce86c7SWei Liu err += offset; 191160ce86c7SWei Liu } else { 191260ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 191360ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 191460ce86c7SWei Liu } else { 191560ce86c7SWei Liu flags = omode_to_uflags(mode); 191660ce86c7SWei Liu } 191760ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 191860ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 191960ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 192060ce86c7SWei Liu err = -EROFS; 192160ce86c7SWei Liu goto out; 192260ce86c7SWei Liu } 192360ce86c7SWei Liu } 192460ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 192560ce86c7SWei Liu if (err < 0) { 192660ce86c7SWei Liu goto out; 192760ce86c7SWei Liu } 192860ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 192960ce86c7SWei Liu fidp->open_flags = flags; 193060ce86c7SWei Liu if (flags & O_EXCL) { 193160ce86c7SWei Liu /* 193260ce86c7SWei Liu * We let the host file system do O_EXCL check 193360ce86c7SWei Liu * We should not reclaim such fd 193460ce86c7SWei Liu */ 193560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 193660ce86c7SWei Liu } 193760ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 193860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 193960ce86c7SWei Liu if (err < 0) { 194060ce86c7SWei Liu goto out; 194160ce86c7SWei Liu } 194260ce86c7SWei Liu err += offset; 194360ce86c7SWei Liu } 194460ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 194560ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 194660ce86c7SWei Liu out: 194760ce86c7SWei Liu put_fid(pdu, fidp); 194860ce86c7SWei Liu out_nofid: 194960ce86c7SWei Liu pdu_complete(pdu, err); 195060ce86c7SWei Liu } 195160ce86c7SWei Liu 19528440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 195360ce86c7SWei Liu { 195460ce86c7SWei Liu int32_t dfid, flags, mode; 195560ce86c7SWei Liu gid_t gid; 195660ce86c7SWei Liu ssize_t err = 0; 195760ce86c7SWei Liu ssize_t offset = 7; 195860ce86c7SWei Liu V9fsString name; 195960ce86c7SWei Liu V9fsFidState *fidp; 196060ce86c7SWei Liu struct stat stbuf; 196160ce86c7SWei Liu V9fsQID qid; 196260ce86c7SWei Liu int32_t iounit; 196360ce86c7SWei Liu V9fsPDU *pdu = opaque; 196460ce86c7SWei Liu 196560ce86c7SWei Liu v9fs_string_init(&name); 196660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 196760ce86c7SWei Liu &name, &flags, &mode, &gid); 196860ce86c7SWei Liu if (err < 0) { 196960ce86c7SWei Liu goto out_nofid; 197060ce86c7SWei Liu } 197160ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 197260ce86c7SWei Liu 1973fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 1974fff39a7aSGreg Kurz err = -ENOENT; 1975fff39a7aSGreg Kurz goto out_nofid; 1976fff39a7aSGreg Kurz } 1977fff39a7aSGreg Kurz 1978805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 1979805b5d98SGreg Kurz err = -EEXIST; 1980805b5d98SGreg Kurz goto out_nofid; 1981805b5d98SGreg Kurz } 1982805b5d98SGreg Kurz 198360ce86c7SWei Liu fidp = get_fid(pdu, dfid); 198460ce86c7SWei Liu if (fidp == NULL) { 198560ce86c7SWei Liu err = -ENOENT; 198660ce86c7SWei Liu goto out_nofid; 198760ce86c7SWei Liu } 1988d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 1989d63fb193SLi Qiang err = -EINVAL; 1990d63fb193SLi Qiang goto out; 1991d63fb193SLi Qiang } 199260ce86c7SWei Liu 199360ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 199460ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 199560ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 199660ce86c7SWei Liu if (err < 0) { 199760ce86c7SWei Liu goto out; 199860ce86c7SWei Liu } 199960ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 200060ce86c7SWei Liu fidp->open_flags = flags; 200160ce86c7SWei Liu if (flags & O_EXCL) { 200260ce86c7SWei Liu /* 200360ce86c7SWei Liu * We let the host file system do O_EXCL check 200460ce86c7SWei Liu * We should not reclaim such fd 200560ce86c7SWei Liu */ 200660ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 200760ce86c7SWei Liu } 200860ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20093b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20103b5ee9e8SAntonios Motakis if (err < 0) { 20113b5ee9e8SAntonios Motakis goto out; 20123b5ee9e8SAntonios Motakis } 201360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 201460ce86c7SWei Liu if (err < 0) { 201560ce86c7SWei Liu goto out; 201660ce86c7SWei Liu } 201760ce86c7SWei Liu err += offset; 201860ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 201960ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 202060ce86c7SWei Liu out: 202160ce86c7SWei Liu put_fid(pdu, fidp); 202260ce86c7SWei Liu out_nofid: 202360ce86c7SWei Liu pdu_complete(pdu, err); 202460ce86c7SWei Liu v9fs_string_free(&name); 202560ce86c7SWei Liu } 202660ce86c7SWei Liu 2027a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 202860ce86c7SWei Liu { 202960ce86c7SWei Liu int err; 203060ce86c7SWei Liu int32_t fid; 203160ce86c7SWei Liu int datasync; 203260ce86c7SWei Liu size_t offset = 7; 203360ce86c7SWei Liu V9fsFidState *fidp; 203460ce86c7SWei Liu V9fsPDU *pdu = opaque; 203560ce86c7SWei Liu 203660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 203760ce86c7SWei Liu if (err < 0) { 203860ce86c7SWei Liu goto out_nofid; 203960ce86c7SWei Liu } 204060ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 204160ce86c7SWei Liu 204260ce86c7SWei Liu fidp = get_fid(pdu, fid); 204360ce86c7SWei Liu if (fidp == NULL) { 204460ce86c7SWei Liu err = -ENOENT; 204560ce86c7SWei Liu goto out_nofid; 204660ce86c7SWei Liu } 204760ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 204860ce86c7SWei Liu if (!err) { 204960ce86c7SWei Liu err = offset; 205060ce86c7SWei Liu } 205160ce86c7SWei Liu put_fid(pdu, fidp); 205260ce86c7SWei Liu out_nofid: 205360ce86c7SWei Liu pdu_complete(pdu, err); 205460ce86c7SWei Liu } 205560ce86c7SWei Liu 20568440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 205760ce86c7SWei Liu { 205860ce86c7SWei Liu int err; 205960ce86c7SWei Liu int32_t fid; 206060ce86c7SWei Liu size_t offset = 7; 206160ce86c7SWei Liu V9fsFidState *fidp; 206260ce86c7SWei Liu V9fsPDU *pdu = opaque; 206360ce86c7SWei Liu V9fsState *s = pdu->s; 206460ce86c7SWei Liu 206560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 206660ce86c7SWei Liu if (err < 0) { 206760ce86c7SWei Liu goto out_nofid; 206860ce86c7SWei Liu } 206960ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 207060ce86c7SWei Liu 207160ce86c7SWei Liu fidp = clunk_fid(s, fid); 207260ce86c7SWei Liu if (fidp == NULL) { 207360ce86c7SWei Liu err = -ENOENT; 207460ce86c7SWei Liu goto out_nofid; 207560ce86c7SWei Liu } 207660ce86c7SWei Liu /* 207760ce86c7SWei Liu * Bump the ref so that put_fid will 207860ce86c7SWei Liu * free the fid. 207960ce86c7SWei Liu */ 208060ce86c7SWei Liu fidp->ref++; 208160ce86c7SWei Liu err = put_fid(pdu, fidp); 208260ce86c7SWei Liu if (!err) { 208360ce86c7SWei Liu err = offset; 208460ce86c7SWei Liu } 208560ce86c7SWei Liu out_nofid: 208660ce86c7SWei Liu pdu_complete(pdu, err); 208760ce86c7SWei Liu } 208860ce86c7SWei Liu 2089bcb8998fSStefano Stabellini /* 2090bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2091bcb8998fSStefano Stabellini * 2092bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2093bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2094bcb8998fSStefano Stabellini * @size: number of bytes to include 2095bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2096bcb8998fSStefano Stabellini * 2097bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2098bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2099bcb8998fSStefano Stabellini */ 2100bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2101cf45183bSStefano Stabellini size_t skip, size_t size, 2102bcb8998fSStefano Stabellini bool is_write) 2103bcb8998fSStefano Stabellini { 2104bcb8998fSStefano Stabellini QEMUIOVector elem; 2105bcb8998fSStefano Stabellini struct iovec *iov; 2106bcb8998fSStefano Stabellini unsigned int niov; 2107bcb8998fSStefano Stabellini 210888da0b03SStefano Stabellini if (is_write) { 2109cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 211088da0b03SStefano Stabellini } else { 2111cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 211288da0b03SStefano Stabellini } 2113bcb8998fSStefano Stabellini 2114bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2115bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2116cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2117bcb8998fSStefano Stabellini } 2118bcb8998fSStefano Stabellini 211960ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 212060ce86c7SWei Liu uint64_t off, uint32_t max_count) 212160ce86c7SWei Liu { 212260ce86c7SWei Liu ssize_t err; 212360ce86c7SWei Liu size_t offset = 7; 2124cf45183bSStefano Stabellini uint64_t read_count; 2125bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 212660ce86c7SWei Liu 21277e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21287e55d65cSLi Qiang read_count = 0; 212916724a17SGreg Kurz } else { 2130cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2131cf45183bSStefano Stabellini } 2132cf45183bSStefano Stabellini if (read_count > max_count) { 213360ce86c7SWei Liu read_count = max_count; 213460ce86c7SWei Liu } 213560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 213660ce86c7SWei Liu if (err < 0) { 213760ce86c7SWei Liu return err; 213860ce86c7SWei Liu } 213960ce86c7SWei Liu offset += err; 214000588a0aSWei Liu 2141cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2142fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 214360ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 214460ce86c7SWei Liu read_count); 2145bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 214660ce86c7SWei Liu if (err < 0) { 214760ce86c7SWei Liu return err; 214860ce86c7SWei Liu } 214960ce86c7SWei Liu offset += err; 215060ce86c7SWei Liu return offset; 215160ce86c7SWei Liu } 215260ce86c7SWei Liu 21538440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 21548440e22eSGreg Kurz V9fsFidState *fidp, 21558440e22eSGreg Kurz uint32_t max_count) 215660ce86c7SWei Liu { 215760ce86c7SWei Liu V9fsPath path; 215860ce86c7SWei Liu V9fsStat v9stat; 215960ce86c7SWei Liu int len, err = 0; 216060ce86c7SWei Liu int32_t count = 0; 216160ce86c7SWei Liu struct stat stbuf; 216260ce86c7SWei Liu off_t saved_dir_pos; 2163635324e8SGreg Kurz struct dirent *dent; 216460ce86c7SWei Liu 216560ce86c7SWei Liu /* save the directory position */ 216660ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 216760ce86c7SWei Liu if (saved_dir_pos < 0) { 216860ce86c7SWei Liu return saved_dir_pos; 216960ce86c7SWei Liu } 217060ce86c7SWei Liu 217160ce86c7SWei Liu while (1) { 217260ce86c7SWei Liu v9fs_path_init(&path); 21737cde47d4SGreg Kurz 21747cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 21757cde47d4SGreg Kurz 2176635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2177635324e8SGreg Kurz if (err || !dent) { 217860ce86c7SWei Liu break; 217960ce86c7SWei Liu } 218060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 218160ce86c7SWei Liu if (err < 0) { 21828762a46dSGreg Kurz break; 218360ce86c7SWei Liu } 218460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 218560ce86c7SWei Liu if (err < 0) { 21868762a46dSGreg Kurz break; 218760ce86c7SWei Liu } 21886069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 218960ce86c7SWei Liu if (err < 0) { 21908762a46dSGreg Kurz break; 219160ce86c7SWei Liu } 2192772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 21937cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 21947cde47d4SGreg Kurz 219560ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 219660ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 219760ce86c7SWei Liu v9fs_stat_free(&v9stat); 219860ce86c7SWei Liu v9fs_path_free(&path); 219960ce86c7SWei Liu return count; 220060ce86c7SWei Liu } 2201772a7369SJan Dakinevich 2202772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2203772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2204772a7369SJan Dakinevich 2205772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2206772a7369SJan Dakinevich 2207772a7369SJan Dakinevich if (len < 0) { 2208772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2209772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2210772a7369SJan Dakinevich v9fs_path_free(&path); 2211772a7369SJan Dakinevich return len; 2212772a7369SJan Dakinevich } 221360ce86c7SWei Liu count += len; 221460ce86c7SWei Liu v9fs_stat_free(&v9stat); 221560ce86c7SWei Liu v9fs_path_free(&path); 221660ce86c7SWei Liu saved_dir_pos = dent->d_off; 221760ce86c7SWei Liu } 22188762a46dSGreg Kurz 22197cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22207cde47d4SGreg Kurz 222160ce86c7SWei Liu v9fs_path_free(&path); 222260ce86c7SWei Liu if (err < 0) { 222360ce86c7SWei Liu return err; 222460ce86c7SWei Liu } 222560ce86c7SWei Liu return count; 222660ce86c7SWei Liu } 222760ce86c7SWei Liu 22288440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 222960ce86c7SWei Liu { 223060ce86c7SWei Liu int32_t fid; 223160ce86c7SWei Liu uint64_t off; 223260ce86c7SWei Liu ssize_t err = 0; 223360ce86c7SWei Liu int32_t count = 0; 223460ce86c7SWei Liu size_t offset = 7; 223560ce86c7SWei Liu uint32_t max_count; 223660ce86c7SWei Liu V9fsFidState *fidp; 223760ce86c7SWei Liu V9fsPDU *pdu = opaque; 223860ce86c7SWei Liu V9fsState *s = pdu->s; 223960ce86c7SWei Liu 224060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 224160ce86c7SWei Liu if (err < 0) { 224260ce86c7SWei Liu goto out_nofid; 224360ce86c7SWei Liu } 224460ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 224560ce86c7SWei Liu 224660ce86c7SWei Liu fidp = get_fid(pdu, fid); 224760ce86c7SWei Liu if (fidp == NULL) { 224860ce86c7SWei Liu err = -EINVAL; 224960ce86c7SWei Liu goto out_nofid; 225060ce86c7SWei Liu } 225160ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2252d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2253d2c5cf7cSChristian Schoenebeck warn_report_once( 2254d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2255d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2256d2c5cf7cSChristian Schoenebeck ); 2257d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2258d2c5cf7cSChristian Schoenebeck goto out; 2259d2c5cf7cSChristian Schoenebeck } 226060ce86c7SWei Liu if (off == 0) { 226160ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 226260ce86c7SWei Liu } 226360ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 226460ce86c7SWei Liu if (count < 0) { 226560ce86c7SWei Liu err = count; 226660ce86c7SWei Liu goto out; 226760ce86c7SWei Liu } 226860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 226960ce86c7SWei Liu if (err < 0) { 227060ce86c7SWei Liu goto out; 227160ce86c7SWei Liu } 227260ce86c7SWei Liu err += offset + count; 227360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 227460ce86c7SWei Liu QEMUIOVector qiov_full; 227560ce86c7SWei Liu QEMUIOVector qiov; 227660ce86c7SWei Liu int32_t len; 227760ce86c7SWei Liu 2278cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 227960ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 228060ce86c7SWei Liu do { 228160ce86c7SWei Liu qemu_iovec_reset(&qiov); 228260ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 228360ce86c7SWei Liu if (0) { 228460ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 228560ce86c7SWei Liu } 228660ce86c7SWei Liu /* Loop in case of EINTR */ 228760ce86c7SWei Liu do { 228860ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 228960ce86c7SWei Liu if (len >= 0) { 229060ce86c7SWei Liu off += len; 229160ce86c7SWei Liu count += len; 229260ce86c7SWei Liu } 229360ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 229460ce86c7SWei Liu if (len < 0) { 229560ce86c7SWei Liu /* IO error return the error */ 229660ce86c7SWei Liu err = len; 2297e95c9a49SLi Qiang goto out_free_iovec; 229860ce86c7SWei Liu } 229960ce86c7SWei Liu } while (count < max_count && len > 0); 230060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 230160ce86c7SWei Liu if (err < 0) { 2302e95c9a49SLi Qiang goto out_free_iovec; 230360ce86c7SWei Liu } 230460ce86c7SWei Liu err += offset + count; 2305e95c9a49SLi Qiang out_free_iovec: 230660ce86c7SWei Liu qemu_iovec_destroy(&qiov); 230760ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 230860ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 230960ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 231060ce86c7SWei Liu } else { 231160ce86c7SWei Liu err = -EINVAL; 231260ce86c7SWei Liu } 231360ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 231460ce86c7SWei Liu out: 231560ce86c7SWei Liu put_fid(pdu, fidp); 231660ce86c7SWei Liu out_nofid: 231760ce86c7SWei Liu pdu_complete(pdu, err); 231860ce86c7SWei Liu } 231960ce86c7SWei Liu 232029c9d2caSChristian Schoenebeck /** 232129c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 232229c9d2caSChristian Schoenebeck * 232329c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 232429c9d2caSChristian Schoenebeck * @returns required size in bytes 232529c9d2caSChristian Schoenebeck */ 232629c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 232760ce86c7SWei Liu { 232860ce86c7SWei Liu /* 232960ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 233060ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 233160ce86c7SWei Liu */ 233260ce86c7SWei Liu return 24 + v9fs_string_size(name); 233360ce86c7SWei Liu } 233460ce86c7SWei Liu 23350c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 23360c4356baSChristian Schoenebeck { 23370c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 23380c4356baSChristian Schoenebeck 23390c4356baSChristian Schoenebeck for (; e; e = next) { 23400c4356baSChristian Schoenebeck next = e->next; 23410c4356baSChristian Schoenebeck g_free(e->dent); 23420c4356baSChristian Schoenebeck g_free(e->st); 23430c4356baSChristian Schoenebeck g_free(e); 23440c4356baSChristian Schoenebeck } 23450c4356baSChristian Schoenebeck } 23460c4356baSChristian Schoenebeck 23478440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 23480c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 234960ce86c7SWei Liu { 235060ce86c7SWei Liu size_t size; 235160ce86c7SWei Liu V9fsQID qid; 235260ce86c7SWei Liu V9fsString name; 235360ce86c7SWei Liu int len, err = 0; 235460ce86c7SWei Liu int32_t count = 0; 2355635324e8SGreg Kurz struct dirent *dent; 23560c4356baSChristian Schoenebeck struct stat *st; 23570c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 235860ce86c7SWei Liu 23590c4356baSChristian Schoenebeck /* 23600c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 23610c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 23620c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 23630c4356baSChristian Schoenebeck */ 23640c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 23650c4356baSChristian Schoenebeck 23660c4356baSChristian Schoenebeck /* 23670c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 23680c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 23690c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 23700c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 23710c4356baSChristian Schoenebeck */ 23720c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 23730c4356baSChristian Schoenebeck dostat); 23740c4356baSChristian Schoenebeck if (count < 0) { 23750c4356baSChristian Schoenebeck err = count; 23760c4356baSChristian Schoenebeck count = 0; 23770c4356baSChristian Schoenebeck goto out; 237860ce86c7SWei Liu } 23790c4356baSChristian Schoenebeck count = 0; 238060ce86c7SWei Liu 23810c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 23820c4356baSChristian Schoenebeck dent = e->dent; 23831a6ed33cSAntonios Motakis 23841a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 23850c4356baSChristian Schoenebeck st = e->st; 23860c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 23870c4356baSChristian Schoenebeck if (!st) { 23880c4356baSChristian Schoenebeck err = -1; 23890c4356baSChristian Schoenebeck break; 23900c4356baSChristian Schoenebeck } 23910c4356baSChristian Schoenebeck 23920c4356baSChristian Schoenebeck /* remap inode */ 23930c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 23941a6ed33cSAntonios Motakis if (err < 0) { 23950c4356baSChristian Schoenebeck break; 23961a6ed33cSAntonios Motakis } 23971a6ed33cSAntonios Motakis } else { 239860ce86c7SWei Liu /* 239960ce86c7SWei Liu * Fill up just the path field of qid because the client uses 240060ce86c7SWei Liu * only that. To fill the entire qid structure we will have 24011a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 24020c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 24031a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 24041a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 24051a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 24061a6ed33cSAntonios Motakis * files/dirs through other ways. 240760ce86c7SWei Liu */ 240860ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 240960ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 241060ce86c7SWei Liu /* Fill the other fields with dummy values */ 241160ce86c7SWei Liu qid.type = 0; 241260ce86c7SWei Liu qid.version = 0; 24131a6ed33cSAntonios Motakis } 241460ce86c7SWei Liu 24150c4356baSChristian Schoenebeck v9fs_string_init(&name); 24160c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24170c4356baSChristian Schoenebeck 241860ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 241960ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 242060ce86c7SWei Liu &qid, dent->d_off, 242160ce86c7SWei Liu dent->d_type, &name); 24227cde47d4SGreg Kurz 24230c4356baSChristian Schoenebeck v9fs_string_free(&name); 24247cde47d4SGreg Kurz 242560ce86c7SWei Liu if (len < 0) { 24260c4356baSChristian Schoenebeck err = len; 24270c4356baSChristian Schoenebeck break; 242860ce86c7SWei Liu } 24290c4356baSChristian Schoenebeck 243060ce86c7SWei Liu count += len; 243160ce86c7SWei Liu } 24327cde47d4SGreg Kurz 24330c4356baSChristian Schoenebeck out: 24340c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 243560ce86c7SWei Liu if (err < 0) { 243660ce86c7SWei Liu return err; 243760ce86c7SWei Liu } 243860ce86c7SWei Liu return count; 243960ce86c7SWei Liu } 244060ce86c7SWei Liu 24418440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 244260ce86c7SWei Liu { 244360ce86c7SWei Liu int32_t fid; 244460ce86c7SWei Liu V9fsFidState *fidp; 244560ce86c7SWei Liu ssize_t retval = 0; 244660ce86c7SWei Liu size_t offset = 7; 244760ce86c7SWei Liu uint64_t initial_offset; 244860ce86c7SWei Liu int32_t count; 244960ce86c7SWei Liu uint32_t max_count; 245060ce86c7SWei Liu V9fsPDU *pdu = opaque; 2451d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 245260ce86c7SWei Liu 245360ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 245460ce86c7SWei Liu &initial_offset, &max_count); 245560ce86c7SWei Liu if (retval < 0) { 245660ce86c7SWei Liu goto out_nofid; 245760ce86c7SWei Liu } 245860ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 245960ce86c7SWei Liu 2460d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2461d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2462d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2463d36a5c22SChristian Schoenebeck warn_report_once( 2464d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2465d36a5c22SChristian Schoenebeck ); 2466d36a5c22SChristian Schoenebeck } 2467d36a5c22SChristian Schoenebeck 246860ce86c7SWei Liu fidp = get_fid(pdu, fid); 246960ce86c7SWei Liu if (fidp == NULL) { 247060ce86c7SWei Liu retval = -EINVAL; 247160ce86c7SWei Liu goto out_nofid; 247260ce86c7SWei Liu } 2473f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 247460ce86c7SWei Liu retval = -EINVAL; 247560ce86c7SWei Liu goto out; 247660ce86c7SWei Liu } 2477d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2478d2c5cf7cSChristian Schoenebeck warn_report_once( 2479d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2480d2c5cf7cSChristian Schoenebeck "protocol version" 2481d2c5cf7cSChristian Schoenebeck ); 2482d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2483d2c5cf7cSChristian Schoenebeck goto out; 2484d2c5cf7cSChristian Schoenebeck } 24850c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 248660ce86c7SWei Liu if (count < 0) { 248760ce86c7SWei Liu retval = count; 248860ce86c7SWei Liu goto out; 248960ce86c7SWei Liu } 249060ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 249160ce86c7SWei Liu if (retval < 0) { 249260ce86c7SWei Liu goto out; 249360ce86c7SWei Liu } 249460ce86c7SWei Liu retval += count + offset; 249560ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 249660ce86c7SWei Liu out: 249760ce86c7SWei Liu put_fid(pdu, fidp); 249860ce86c7SWei Liu out_nofid: 249960ce86c7SWei Liu pdu_complete(pdu, retval); 250060ce86c7SWei Liu } 250160ce86c7SWei Liu 250260ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 250360ce86c7SWei Liu uint64_t off, uint32_t count, 250460ce86c7SWei Liu struct iovec *sg, int cnt) 250560ce86c7SWei Liu { 250660ce86c7SWei Liu int i, to_copy; 250760ce86c7SWei Liu ssize_t err = 0; 25087e55d65cSLi Qiang uint64_t write_count; 250960ce86c7SWei Liu size_t offset = 7; 251060ce86c7SWei Liu 251160ce86c7SWei Liu 25127e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2513b858e80aSDaniel Henrique Barboza return -ENOSPC; 251460ce86c7SWei Liu } 25157e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 25167e55d65cSLi Qiang if (write_count > count) { 25177e55d65cSLi Qiang write_count = count; 25187e55d65cSLi Qiang } 251960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 252060ce86c7SWei Liu if (err < 0) { 252160ce86c7SWei Liu return err; 252260ce86c7SWei Liu } 252360ce86c7SWei Liu err += offset; 252460ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 252560ce86c7SWei Liu /* 252660ce86c7SWei Liu * Now copy the content from sg list 252760ce86c7SWei Liu */ 252860ce86c7SWei Liu for (i = 0; i < cnt; i++) { 252960ce86c7SWei Liu if (write_count > sg[i].iov_len) { 253060ce86c7SWei Liu to_copy = sg[i].iov_len; 253160ce86c7SWei Liu } else { 253260ce86c7SWei Liu to_copy = write_count; 253360ce86c7SWei Liu } 253460ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 253560ce86c7SWei Liu /* updating vs->off since we are not using below */ 253660ce86c7SWei Liu off += to_copy; 253760ce86c7SWei Liu write_count -= to_copy; 253860ce86c7SWei Liu } 2539b858e80aSDaniel Henrique Barboza 254060ce86c7SWei Liu return err; 254160ce86c7SWei Liu } 254260ce86c7SWei Liu 25438440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 254460ce86c7SWei Liu { 254560ce86c7SWei Liu ssize_t err; 254660ce86c7SWei Liu int32_t fid; 254760ce86c7SWei Liu uint64_t off; 254860ce86c7SWei Liu uint32_t count; 254960ce86c7SWei Liu int32_t len = 0; 255060ce86c7SWei Liu int32_t total = 0; 255160ce86c7SWei Liu size_t offset = 7; 255260ce86c7SWei Liu V9fsFidState *fidp; 255360ce86c7SWei Liu V9fsPDU *pdu = opaque; 255460ce86c7SWei Liu V9fsState *s = pdu->s; 255560ce86c7SWei Liu QEMUIOVector qiov_full; 255660ce86c7SWei Liu QEMUIOVector qiov; 255760ce86c7SWei Liu 255860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 255960ce86c7SWei Liu if (err < 0) { 256060ce86c7SWei Liu pdu_complete(pdu, err); 256160ce86c7SWei Liu return; 256260ce86c7SWei Liu } 256360ce86c7SWei Liu offset += err; 2564cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 256560ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 256660ce86c7SWei Liu 256760ce86c7SWei Liu fidp = get_fid(pdu, fid); 256860ce86c7SWei Liu if (fidp == NULL) { 256960ce86c7SWei Liu err = -EINVAL; 257060ce86c7SWei Liu goto out_nofid; 257160ce86c7SWei Liu } 257260ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 257360ce86c7SWei Liu if (fidp->fs.fd == -1) { 257460ce86c7SWei Liu err = -EINVAL; 257560ce86c7SWei Liu goto out; 257660ce86c7SWei Liu } 257760ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 257860ce86c7SWei Liu /* 257960ce86c7SWei Liu * setxattr operation 258060ce86c7SWei Liu */ 258160ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 258260ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 258360ce86c7SWei Liu goto out; 258460ce86c7SWei Liu } else { 258560ce86c7SWei Liu err = -EINVAL; 258660ce86c7SWei Liu goto out; 258760ce86c7SWei Liu } 258860ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 258960ce86c7SWei Liu do { 259060ce86c7SWei Liu qemu_iovec_reset(&qiov); 259160ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 259260ce86c7SWei Liu if (0) { 259360ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 259460ce86c7SWei Liu } 259560ce86c7SWei Liu /* Loop in case of EINTR */ 259660ce86c7SWei Liu do { 259760ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 259860ce86c7SWei Liu if (len >= 0) { 259960ce86c7SWei Liu off += len; 260060ce86c7SWei Liu total += len; 260160ce86c7SWei Liu } 260260ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 260360ce86c7SWei Liu if (len < 0) { 260460ce86c7SWei Liu /* IO error return the error */ 260560ce86c7SWei Liu err = len; 260660ce86c7SWei Liu goto out_qiov; 260760ce86c7SWei Liu } 260860ce86c7SWei Liu } while (total < count && len > 0); 260960ce86c7SWei Liu 261060ce86c7SWei Liu offset = 7; 261160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 261260ce86c7SWei Liu if (err < 0) { 2613fdfcc9aeSLi Qiang goto out_qiov; 261460ce86c7SWei Liu } 261560ce86c7SWei Liu err += offset; 261660ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 261760ce86c7SWei Liu out_qiov: 261860ce86c7SWei Liu qemu_iovec_destroy(&qiov); 261960ce86c7SWei Liu out: 262060ce86c7SWei Liu put_fid(pdu, fidp); 262160ce86c7SWei Liu out_nofid: 262260ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 262360ce86c7SWei Liu pdu_complete(pdu, err); 262460ce86c7SWei Liu } 262560ce86c7SWei Liu 26268440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 262760ce86c7SWei Liu { 262860ce86c7SWei Liu int32_t fid; 262960ce86c7SWei Liu int err = 0; 263060ce86c7SWei Liu size_t offset = 7; 263160ce86c7SWei Liu V9fsFidState *fidp; 263260ce86c7SWei Liu V9fsQID qid; 263360ce86c7SWei Liu int32_t perm; 263460ce86c7SWei Liu int8_t mode; 263560ce86c7SWei Liu V9fsPath path; 263660ce86c7SWei Liu struct stat stbuf; 263760ce86c7SWei Liu V9fsString name; 263860ce86c7SWei Liu V9fsString extension; 263960ce86c7SWei Liu int iounit; 264060ce86c7SWei Liu V9fsPDU *pdu = opaque; 26415b3c77aaSGreg Kurz V9fsState *s = pdu->s; 264260ce86c7SWei Liu 264360ce86c7SWei Liu v9fs_path_init(&path); 264460ce86c7SWei Liu v9fs_string_init(&name); 264560ce86c7SWei Liu v9fs_string_init(&extension); 264660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 264760ce86c7SWei Liu &perm, &mode, &extension); 264860ce86c7SWei Liu if (err < 0) { 264960ce86c7SWei Liu goto out_nofid; 265060ce86c7SWei Liu } 265160ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 265260ce86c7SWei Liu 2653fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2654fff39a7aSGreg Kurz err = -ENOENT; 2655fff39a7aSGreg Kurz goto out_nofid; 2656fff39a7aSGreg Kurz } 2657fff39a7aSGreg Kurz 2658805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2659805b5d98SGreg Kurz err = -EEXIST; 2660805b5d98SGreg Kurz goto out_nofid; 2661805b5d98SGreg Kurz } 2662805b5d98SGreg Kurz 266360ce86c7SWei Liu fidp = get_fid(pdu, fid); 266460ce86c7SWei Liu if (fidp == NULL) { 266560ce86c7SWei Liu err = -EINVAL; 266660ce86c7SWei Liu goto out_nofid; 266760ce86c7SWei Liu } 2668d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2669d63fb193SLi Qiang err = -EINVAL; 2670d63fb193SLi Qiang goto out; 2671d63fb193SLi Qiang } 267260ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 267360ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 267460ce86c7SWei Liu fidp->uid, -1, &stbuf); 267560ce86c7SWei Liu if (err < 0) { 267660ce86c7SWei Liu goto out; 267760ce86c7SWei Liu } 267860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 267960ce86c7SWei Liu if (err < 0) { 268060ce86c7SWei Liu goto out; 268160ce86c7SWei Liu } 26825b3c77aaSGreg Kurz v9fs_path_write_lock(s); 268360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26845b3c77aaSGreg Kurz v9fs_path_unlock(s); 268560ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 268660ce86c7SWei Liu if (err < 0) { 268760ce86c7SWei Liu goto out; 268860ce86c7SWei Liu } 268960ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 269060ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 269160ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 269260ce86c7SWei Liu extension.data, -1 , &stbuf); 269360ce86c7SWei Liu if (err < 0) { 269460ce86c7SWei Liu goto out; 269560ce86c7SWei Liu } 269660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 269760ce86c7SWei Liu if (err < 0) { 269860ce86c7SWei Liu goto out; 269960ce86c7SWei Liu } 27005b3c77aaSGreg Kurz v9fs_path_write_lock(s); 270160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27025b3c77aaSGreg Kurz v9fs_path_unlock(s); 270360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 270460ce86c7SWei Liu int32_t ofid = atoi(extension.data); 270560ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 270660ce86c7SWei Liu if (ofidp == NULL) { 270760ce86c7SWei Liu err = -EINVAL; 270860ce86c7SWei Liu goto out; 270960ce86c7SWei Liu } 271060ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 271160ce86c7SWei Liu put_fid(pdu, ofidp); 271260ce86c7SWei Liu if (err < 0) { 271360ce86c7SWei Liu goto out; 271460ce86c7SWei Liu } 271560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 271660ce86c7SWei Liu if (err < 0) { 271760ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 271860ce86c7SWei Liu goto out; 271960ce86c7SWei Liu } 27205b3c77aaSGreg Kurz v9fs_path_write_lock(s); 272160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27225b3c77aaSGreg Kurz v9fs_path_unlock(s); 272360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 272460ce86c7SWei Liu if (err < 0) { 272560ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 272660ce86c7SWei Liu goto out; 272760ce86c7SWei Liu } 272860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 272960ce86c7SWei Liu char ctype; 273060ce86c7SWei Liu uint32_t major, minor; 273160ce86c7SWei Liu mode_t nmode = 0; 273260ce86c7SWei Liu 273360ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 273460ce86c7SWei Liu err = -errno; 273560ce86c7SWei Liu goto out; 273660ce86c7SWei Liu } 273760ce86c7SWei Liu 273860ce86c7SWei Liu switch (ctype) { 273960ce86c7SWei Liu case 'c': 274060ce86c7SWei Liu nmode = S_IFCHR; 274160ce86c7SWei Liu break; 274260ce86c7SWei Liu case 'b': 274360ce86c7SWei Liu nmode = S_IFBLK; 274460ce86c7SWei Liu break; 274560ce86c7SWei Liu default: 274660ce86c7SWei Liu err = -EIO; 274760ce86c7SWei Liu goto out; 274860ce86c7SWei Liu } 274960ce86c7SWei Liu 275060ce86c7SWei Liu nmode |= perm & 0777; 275160ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 275260ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 275360ce86c7SWei Liu if (err < 0) { 275460ce86c7SWei Liu goto out; 275560ce86c7SWei Liu } 275660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 275760ce86c7SWei Liu if (err < 0) { 275860ce86c7SWei Liu goto out; 275960ce86c7SWei Liu } 27605b3c77aaSGreg Kurz v9fs_path_write_lock(s); 276160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27625b3c77aaSGreg Kurz v9fs_path_unlock(s); 276360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 276460ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 276560ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 276660ce86c7SWei Liu if (err < 0) { 276760ce86c7SWei Liu goto out; 276860ce86c7SWei Liu } 276960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 277060ce86c7SWei Liu if (err < 0) { 277160ce86c7SWei Liu goto out; 277260ce86c7SWei Liu } 27735b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27755b3c77aaSGreg Kurz v9fs_path_unlock(s); 277660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 277760ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 277860ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 277960ce86c7SWei Liu if (err < 0) { 278060ce86c7SWei Liu goto out; 278160ce86c7SWei Liu } 278260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 278360ce86c7SWei Liu if (err < 0) { 278460ce86c7SWei Liu goto out; 278560ce86c7SWei Liu } 27865b3c77aaSGreg Kurz v9fs_path_write_lock(s); 278760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27885b3c77aaSGreg Kurz v9fs_path_unlock(s); 278960ce86c7SWei Liu } else { 279060ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 279160ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 279260ce86c7SWei Liu if (err < 0) { 279360ce86c7SWei Liu goto out; 279460ce86c7SWei Liu } 279560ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 279660ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 279760ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 279860ce86c7SWei Liu /* 279960ce86c7SWei Liu * We let the host file system do O_EXCL check 280060ce86c7SWei Liu * We should not reclaim such fd 280160ce86c7SWei Liu */ 280260ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 280360ce86c7SWei Liu } 280460ce86c7SWei Liu } 280560ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 28063b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28073b5ee9e8SAntonios Motakis if (err < 0) { 28083b5ee9e8SAntonios Motakis goto out; 28093b5ee9e8SAntonios Motakis } 281060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 281160ce86c7SWei Liu if (err < 0) { 281260ce86c7SWei Liu goto out; 281360ce86c7SWei Liu } 281460ce86c7SWei Liu err += offset; 281560ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 281660ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 281760ce86c7SWei Liu out: 281860ce86c7SWei Liu put_fid(pdu, fidp); 281960ce86c7SWei Liu out_nofid: 282060ce86c7SWei Liu pdu_complete(pdu, err); 282160ce86c7SWei Liu v9fs_string_free(&name); 282260ce86c7SWei Liu v9fs_string_free(&extension); 282360ce86c7SWei Liu v9fs_path_free(&path); 282460ce86c7SWei Liu } 282560ce86c7SWei Liu 28268440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 282760ce86c7SWei Liu { 282860ce86c7SWei Liu V9fsPDU *pdu = opaque; 282960ce86c7SWei Liu V9fsString name; 283060ce86c7SWei Liu V9fsString symname; 283160ce86c7SWei Liu V9fsFidState *dfidp; 283260ce86c7SWei Liu V9fsQID qid; 283360ce86c7SWei Liu struct stat stbuf; 283460ce86c7SWei Liu int32_t dfid; 283560ce86c7SWei Liu int err = 0; 283660ce86c7SWei Liu gid_t gid; 283760ce86c7SWei Liu size_t offset = 7; 283860ce86c7SWei Liu 283960ce86c7SWei Liu v9fs_string_init(&name); 284060ce86c7SWei Liu v9fs_string_init(&symname); 284160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 284260ce86c7SWei Liu if (err < 0) { 284360ce86c7SWei Liu goto out_nofid; 284460ce86c7SWei Liu } 284560ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 284660ce86c7SWei Liu 2847fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2848fff39a7aSGreg Kurz err = -ENOENT; 2849fff39a7aSGreg Kurz goto out_nofid; 2850fff39a7aSGreg Kurz } 2851fff39a7aSGreg Kurz 2852805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2853805b5d98SGreg Kurz err = -EEXIST; 2854805b5d98SGreg Kurz goto out_nofid; 2855805b5d98SGreg Kurz } 2856805b5d98SGreg Kurz 285760ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 285860ce86c7SWei Liu if (dfidp == NULL) { 285960ce86c7SWei Liu err = -EINVAL; 286060ce86c7SWei Liu goto out_nofid; 286160ce86c7SWei Liu } 286260ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 286360ce86c7SWei Liu if (err < 0) { 286460ce86c7SWei Liu goto out; 286560ce86c7SWei Liu } 28663b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28673b5ee9e8SAntonios Motakis if (err < 0) { 28683b5ee9e8SAntonios Motakis goto out; 28693b5ee9e8SAntonios Motakis } 287060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 287160ce86c7SWei Liu if (err < 0) { 287260ce86c7SWei Liu goto out; 287360ce86c7SWei Liu } 287460ce86c7SWei Liu err += offset; 287560ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 287660ce86c7SWei Liu qid.type, qid.version, qid.path); 287760ce86c7SWei Liu out: 287860ce86c7SWei Liu put_fid(pdu, dfidp); 287960ce86c7SWei Liu out_nofid: 288060ce86c7SWei Liu pdu_complete(pdu, err); 288160ce86c7SWei Liu v9fs_string_free(&name); 288260ce86c7SWei Liu v9fs_string_free(&symname); 288360ce86c7SWei Liu } 288460ce86c7SWei Liu 2885a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 288660ce86c7SWei Liu { 288760ce86c7SWei Liu ssize_t err; 288860ce86c7SWei Liu int16_t tag; 288960ce86c7SWei Liu size_t offset = 7; 2890d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 289160ce86c7SWei Liu V9fsPDU *pdu = opaque; 289260ce86c7SWei Liu V9fsState *s = pdu->s; 289360ce86c7SWei Liu 289460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 289560ce86c7SWei Liu if (err < 0) { 289660ce86c7SWei Liu pdu_complete(pdu, err); 289760ce86c7SWei Liu return; 289860ce86c7SWei Liu } 289960ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 290060ce86c7SWei Liu 2901d5f2af7bSGreg Kurz if (pdu->tag == tag) { 29023dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2903d5f2af7bSGreg Kurz } else { 290460ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 290560ce86c7SWei Liu if (cancel_pdu->tag == tag) { 290660ce86c7SWei Liu break; 290760ce86c7SWei Liu } 290860ce86c7SWei Liu } 2909d5f2af7bSGreg Kurz } 291060ce86c7SWei Liu if (cancel_pdu) { 291160ce86c7SWei Liu cancel_pdu->cancelled = 1; 291260ce86c7SWei Liu /* 291360ce86c7SWei Liu * Wait for pdu to complete. 291460ce86c7SWei Liu */ 29151ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 291618adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 291760ce86c7SWei Liu cancel_pdu->cancelled = 0; 291860ce86c7SWei Liu pdu_free(cancel_pdu); 291960ce86c7SWei Liu } 292018adde86SGreg Kurz } 292160ce86c7SWei Liu pdu_complete(pdu, 7); 292260ce86c7SWei Liu } 292360ce86c7SWei Liu 29248440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 292560ce86c7SWei Liu { 292660ce86c7SWei Liu V9fsPDU *pdu = opaque; 292760ce86c7SWei Liu int32_t dfid, oldfid; 292860ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 292960ce86c7SWei Liu V9fsString name; 293060ce86c7SWei Liu size_t offset = 7; 293160ce86c7SWei Liu int err = 0; 293260ce86c7SWei Liu 293360ce86c7SWei Liu v9fs_string_init(&name); 293460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 293560ce86c7SWei Liu if (err < 0) { 293660ce86c7SWei Liu goto out_nofid; 293760ce86c7SWei Liu } 293860ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 293960ce86c7SWei Liu 2940fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2941fff39a7aSGreg Kurz err = -ENOENT; 2942fff39a7aSGreg Kurz goto out_nofid; 2943fff39a7aSGreg Kurz } 2944fff39a7aSGreg Kurz 2945805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2946805b5d98SGreg Kurz err = -EEXIST; 2947805b5d98SGreg Kurz goto out_nofid; 2948805b5d98SGreg Kurz } 2949805b5d98SGreg Kurz 295060ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 295160ce86c7SWei Liu if (dfidp == NULL) { 295260ce86c7SWei Liu err = -ENOENT; 295360ce86c7SWei Liu goto out_nofid; 295460ce86c7SWei Liu } 295560ce86c7SWei Liu 295660ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 295760ce86c7SWei Liu if (oldfidp == NULL) { 295860ce86c7SWei Liu err = -ENOENT; 295960ce86c7SWei Liu goto out; 296060ce86c7SWei Liu } 296160ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 296260ce86c7SWei Liu if (!err) { 296360ce86c7SWei Liu err = offset; 296460ce86c7SWei Liu } 29654c158678SLi Qiang put_fid(pdu, oldfidp); 296660ce86c7SWei Liu out: 296760ce86c7SWei Liu put_fid(pdu, dfidp); 296860ce86c7SWei Liu out_nofid: 296960ce86c7SWei Liu v9fs_string_free(&name); 297060ce86c7SWei Liu pdu_complete(pdu, err); 297160ce86c7SWei Liu } 297260ce86c7SWei Liu 297360ce86c7SWei Liu /* Only works with path name based fid */ 29748440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 297560ce86c7SWei Liu { 297660ce86c7SWei Liu int32_t fid; 297760ce86c7SWei Liu int err = 0; 297860ce86c7SWei Liu size_t offset = 7; 297960ce86c7SWei Liu V9fsFidState *fidp; 298060ce86c7SWei Liu V9fsPDU *pdu = opaque; 298160ce86c7SWei Liu 298260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 298360ce86c7SWei Liu if (err < 0) { 298460ce86c7SWei Liu goto out_nofid; 298560ce86c7SWei Liu } 298660ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 298760ce86c7SWei Liu 298860ce86c7SWei Liu fidp = get_fid(pdu, fid); 298960ce86c7SWei Liu if (fidp == NULL) { 299060ce86c7SWei Liu err = -EINVAL; 299160ce86c7SWei Liu goto out_nofid; 299260ce86c7SWei Liu } 299360ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 299460ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 299560ce86c7SWei Liu err = -EOPNOTSUPP; 299660ce86c7SWei Liu goto out_err; 299760ce86c7SWei Liu } 299860ce86c7SWei Liu /* 299960ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 300060ce86c7SWei Liu * the file later. So don't reclaim fd 300160ce86c7SWei Liu */ 300260ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 300360ce86c7SWei Liu if (err < 0) { 300460ce86c7SWei Liu goto out_err; 300560ce86c7SWei Liu } 300660ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 300760ce86c7SWei Liu if (!err) { 300860ce86c7SWei Liu err = offset; 300960ce86c7SWei Liu } 301060ce86c7SWei Liu out_err: 301160ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 301260ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 301360ce86c7SWei Liu put_fid(pdu, fidp); 301460ce86c7SWei Liu out_nofid: 301560ce86c7SWei Liu pdu_complete(pdu, err); 301660ce86c7SWei Liu } 301760ce86c7SWei Liu 30188440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 301960ce86c7SWei Liu { 302060ce86c7SWei Liu int err = 0; 302160ce86c7SWei Liu V9fsString name; 302267e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 302360ce86c7SWei Liu size_t offset = 7; 302460ce86c7SWei Liu V9fsPath path; 302560ce86c7SWei Liu V9fsFidState *dfidp; 302660ce86c7SWei Liu V9fsPDU *pdu = opaque; 302760ce86c7SWei Liu 302860ce86c7SWei Liu v9fs_string_init(&name); 302960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 303060ce86c7SWei Liu if (err < 0) { 303160ce86c7SWei Liu goto out_nofid; 303260ce86c7SWei Liu } 3033fff39a7aSGreg Kurz 3034fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3035fff39a7aSGreg Kurz err = -ENOENT; 3036fff39a7aSGreg Kurz goto out_nofid; 3037fff39a7aSGreg Kurz } 3038fff39a7aSGreg Kurz 3039805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3040805b5d98SGreg Kurz err = -EINVAL; 3041805b5d98SGreg Kurz goto out_nofid; 3042805b5d98SGreg Kurz } 3043805b5d98SGreg Kurz 3044805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3045805b5d98SGreg Kurz err = -ENOTEMPTY; 3046805b5d98SGreg Kurz goto out_nofid; 3047805b5d98SGreg Kurz } 3048805b5d98SGreg Kurz 304967e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 305067e87345SKeno Fischer err = -EINVAL; 305167e87345SKeno Fischer goto out_nofid; 305267e87345SKeno Fischer } 305367e87345SKeno Fischer 305467e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 305567e87345SKeno Fischer rflags |= AT_REMOVEDIR; 305667e87345SKeno Fischer } 305767e87345SKeno Fischer 305860ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 305960ce86c7SWei Liu if (dfidp == NULL) { 306060ce86c7SWei Liu err = -EINVAL; 306160ce86c7SWei Liu goto out_nofid; 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 v9fs_path_init(&path); 306860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 306960ce86c7SWei Liu if (err < 0) { 307060ce86c7SWei Liu goto out_err; 307160ce86c7SWei Liu } 307260ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 307360ce86c7SWei Liu if (err < 0) { 307460ce86c7SWei Liu goto out_err; 307560ce86c7SWei Liu } 307667e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 307760ce86c7SWei Liu if (!err) { 307860ce86c7SWei Liu err = offset; 307960ce86c7SWei Liu } 308060ce86c7SWei Liu out_err: 308160ce86c7SWei Liu put_fid(pdu, dfidp); 308260ce86c7SWei Liu v9fs_path_free(&path); 308360ce86c7SWei Liu out_nofid: 308460ce86c7SWei Liu pdu_complete(pdu, err); 308560ce86c7SWei Liu v9fs_string_free(&name); 308660ce86c7SWei Liu } 308760ce86c7SWei Liu 308860ce86c7SWei Liu 308960ce86c7SWei Liu /* Only works with path name based fid */ 30908440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 30918440e22eSGreg Kurz int32_t newdirfid, 30928440e22eSGreg Kurz V9fsString *name) 309360ce86c7SWei Liu { 309460ce86c7SWei Liu int err = 0; 309560ce86c7SWei Liu V9fsPath new_path; 309660ce86c7SWei Liu V9fsFidState *tfidp; 309760ce86c7SWei Liu V9fsState *s = pdu->s; 309860ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 309960ce86c7SWei Liu 310060ce86c7SWei Liu v9fs_path_init(&new_path); 310160ce86c7SWei Liu if (newdirfid != -1) { 310260ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 310360ce86c7SWei Liu if (dirfidp == NULL) { 3104b858e80aSDaniel Henrique Barboza return -ENOENT; 310560ce86c7SWei Liu } 310649dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 310749dd946bSGreg Kurz err = -EINVAL; 310849dd946bSGreg Kurz goto out; 310949dd946bSGreg Kurz } 31104fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 31114fa62005SGreg Kurz if (err < 0) { 31124fa62005SGreg Kurz goto out; 31134fa62005SGreg Kurz } 311460ce86c7SWei Liu } else { 31154d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31164d8bc733SJan Dakinevich V9fsPath dir_path; 31174d8bc733SJan Dakinevich 31184d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31194d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31204d8bc733SJan Dakinevich g_free(dir_name); 31214d8bc733SJan Dakinevich 31224d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31234d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31244fa62005SGreg Kurz if (err < 0) { 31254fa62005SGreg Kurz goto out; 31264fa62005SGreg Kurz } 312760ce86c7SWei Liu } 312860ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 312960ce86c7SWei Liu if (err < 0) { 313060ce86c7SWei Liu goto out; 313160ce86c7SWei Liu } 313260ce86c7SWei Liu /* 313360ce86c7SWei Liu * Fixup fid's pointing to the old name to 313460ce86c7SWei Liu * start pointing to the new name 313560ce86c7SWei Liu */ 3136feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 313760ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 313860ce86c7SWei Liu /* replace the name */ 313960ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 314060ce86c7SWei Liu } 314160ce86c7SWei Liu } 314260ce86c7SWei Liu out: 314360ce86c7SWei Liu if (dirfidp) { 314460ce86c7SWei Liu put_fid(pdu, dirfidp); 314560ce86c7SWei Liu } 314660ce86c7SWei Liu v9fs_path_free(&new_path); 314760ce86c7SWei Liu return err; 314860ce86c7SWei Liu } 314960ce86c7SWei Liu 315060ce86c7SWei Liu /* Only works with path name based fid */ 31518440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 315260ce86c7SWei Liu { 315360ce86c7SWei Liu int32_t fid; 315460ce86c7SWei Liu ssize_t err = 0; 315560ce86c7SWei Liu size_t offset = 7; 315660ce86c7SWei Liu V9fsString name; 315760ce86c7SWei Liu int32_t newdirfid; 315860ce86c7SWei Liu V9fsFidState *fidp; 315960ce86c7SWei Liu V9fsPDU *pdu = opaque; 316060ce86c7SWei Liu V9fsState *s = pdu->s; 316160ce86c7SWei Liu 316260ce86c7SWei Liu v9fs_string_init(&name); 316360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 316460ce86c7SWei Liu if (err < 0) { 316560ce86c7SWei Liu goto out_nofid; 316660ce86c7SWei Liu } 3167fff39a7aSGreg Kurz 3168fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3169fff39a7aSGreg Kurz err = -ENOENT; 3170fff39a7aSGreg Kurz goto out_nofid; 3171fff39a7aSGreg Kurz } 3172fff39a7aSGreg Kurz 3173805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3174805b5d98SGreg Kurz err = -EISDIR; 3175805b5d98SGreg Kurz goto out_nofid; 3176805b5d98SGreg Kurz } 3177805b5d98SGreg Kurz 317860ce86c7SWei Liu fidp = get_fid(pdu, fid); 317960ce86c7SWei Liu if (fidp == NULL) { 318060ce86c7SWei Liu err = -ENOENT; 318160ce86c7SWei Liu goto out_nofid; 318260ce86c7SWei Liu } 318349dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 318449dd946bSGreg Kurz err = -EINVAL; 318549dd946bSGreg Kurz goto out; 318649dd946bSGreg Kurz } 318760ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 318860ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 318960ce86c7SWei Liu err = -EOPNOTSUPP; 319060ce86c7SWei Liu goto out; 319160ce86c7SWei Liu } 319260ce86c7SWei Liu v9fs_path_write_lock(s); 319360ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 319460ce86c7SWei Liu v9fs_path_unlock(s); 319560ce86c7SWei Liu if (!err) { 319660ce86c7SWei Liu err = offset; 319760ce86c7SWei Liu } 319860ce86c7SWei Liu out: 319960ce86c7SWei Liu put_fid(pdu, fidp); 320060ce86c7SWei Liu out_nofid: 320160ce86c7SWei Liu pdu_complete(pdu, err); 320260ce86c7SWei Liu v9fs_string_free(&name); 320360ce86c7SWei Liu } 320460ce86c7SWei Liu 32054fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 32068440e22eSGreg Kurz V9fsString *old_name, 32078440e22eSGreg Kurz V9fsPath *newdir, 320860ce86c7SWei Liu V9fsString *new_name) 320960ce86c7SWei Liu { 321060ce86c7SWei Liu V9fsFidState *tfidp; 321160ce86c7SWei Liu V9fsPath oldpath, newpath; 321260ce86c7SWei Liu V9fsState *s = pdu->s; 32134fa62005SGreg Kurz int err; 321460ce86c7SWei Liu 321560ce86c7SWei Liu v9fs_path_init(&oldpath); 321660ce86c7SWei Liu v9fs_path_init(&newpath); 32174fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32184fa62005SGreg Kurz if (err < 0) { 32194fa62005SGreg Kurz goto out; 32204fa62005SGreg Kurz } 32214fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32224fa62005SGreg Kurz if (err < 0) { 32234fa62005SGreg Kurz goto out; 32244fa62005SGreg Kurz } 322560ce86c7SWei Liu 322660ce86c7SWei Liu /* 322760ce86c7SWei Liu * Fixup fid's pointing to the old name to 322860ce86c7SWei Liu * start pointing to the new name 322960ce86c7SWei Liu */ 3230feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 323160ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 323260ce86c7SWei Liu /* replace the name */ 323360ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 323460ce86c7SWei Liu } 323560ce86c7SWei Liu } 32364fa62005SGreg Kurz out: 323760ce86c7SWei Liu v9fs_path_free(&oldpath); 323860ce86c7SWei Liu v9fs_path_free(&newpath); 32394fa62005SGreg Kurz return err; 324060ce86c7SWei Liu } 324160ce86c7SWei Liu 32428440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 32438440e22eSGreg Kurz V9fsString *old_name, 32448440e22eSGreg Kurz int32_t newdirfid, 324560ce86c7SWei Liu V9fsString *new_name) 324660ce86c7SWei Liu { 324760ce86c7SWei Liu int err = 0; 324860ce86c7SWei Liu V9fsState *s = pdu->s; 324960ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 325060ce86c7SWei Liu 325160ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 325260ce86c7SWei Liu if (olddirfidp == NULL) { 325360ce86c7SWei Liu err = -ENOENT; 325460ce86c7SWei Liu goto out; 325560ce86c7SWei Liu } 325660ce86c7SWei Liu if (newdirfid != -1) { 325760ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 325860ce86c7SWei Liu if (newdirfidp == NULL) { 325960ce86c7SWei Liu err = -ENOENT; 326060ce86c7SWei Liu goto out; 326160ce86c7SWei Liu } 326260ce86c7SWei Liu } else { 326360ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 326460ce86c7SWei Liu } 326560ce86c7SWei Liu 326660ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 326760ce86c7SWei Liu &newdirfidp->path, new_name); 326860ce86c7SWei Liu if (err < 0) { 326960ce86c7SWei Liu goto out; 327060ce86c7SWei Liu } 327160ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 327260ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 32734fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 327460ce86c7SWei Liu &newdirfidp->path, new_name); 327560ce86c7SWei Liu } 327660ce86c7SWei Liu out: 327760ce86c7SWei Liu if (olddirfidp) { 327860ce86c7SWei Liu put_fid(pdu, olddirfidp); 327960ce86c7SWei Liu } 328060ce86c7SWei Liu if (newdirfidp) { 328160ce86c7SWei Liu put_fid(pdu, newdirfidp); 328260ce86c7SWei Liu } 328360ce86c7SWei Liu return err; 328460ce86c7SWei Liu } 328560ce86c7SWei Liu 32868440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 328760ce86c7SWei Liu { 328860ce86c7SWei Liu ssize_t err = 0; 328960ce86c7SWei Liu size_t offset = 7; 329060ce86c7SWei Liu V9fsPDU *pdu = opaque; 329160ce86c7SWei Liu V9fsState *s = pdu->s; 329260ce86c7SWei Liu int32_t olddirfid, newdirfid; 329360ce86c7SWei Liu V9fsString old_name, new_name; 329460ce86c7SWei Liu 329560ce86c7SWei Liu v9fs_string_init(&old_name); 329660ce86c7SWei Liu v9fs_string_init(&new_name); 329760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 329860ce86c7SWei Liu &old_name, &newdirfid, &new_name); 329960ce86c7SWei Liu if (err < 0) { 330060ce86c7SWei Liu goto out_err; 330160ce86c7SWei Liu } 330260ce86c7SWei Liu 3303fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3304fff39a7aSGreg Kurz err = -ENOENT; 3305fff39a7aSGreg Kurz goto out_err; 3306fff39a7aSGreg Kurz } 3307fff39a7aSGreg Kurz 3308805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3309805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3310805b5d98SGreg Kurz err = -EISDIR; 3311805b5d98SGreg Kurz goto out_err; 3312805b5d98SGreg Kurz } 3313805b5d98SGreg Kurz 331460ce86c7SWei Liu v9fs_path_write_lock(s); 331560ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 331660ce86c7SWei Liu &old_name, newdirfid, &new_name); 331760ce86c7SWei Liu v9fs_path_unlock(s); 331860ce86c7SWei Liu if (!err) { 331960ce86c7SWei Liu err = offset; 332060ce86c7SWei Liu } 332160ce86c7SWei Liu 332260ce86c7SWei Liu out_err: 332360ce86c7SWei Liu pdu_complete(pdu, err); 332460ce86c7SWei Liu v9fs_string_free(&old_name); 332560ce86c7SWei Liu v9fs_string_free(&new_name); 332660ce86c7SWei Liu } 332760ce86c7SWei Liu 33288440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 332960ce86c7SWei Liu { 333060ce86c7SWei Liu int32_t fid; 333160ce86c7SWei Liu int err = 0; 333260ce86c7SWei Liu int16_t unused; 333360ce86c7SWei Liu V9fsStat v9stat; 333460ce86c7SWei Liu size_t offset = 7; 333560ce86c7SWei Liu struct stat stbuf; 333660ce86c7SWei Liu V9fsFidState *fidp; 333760ce86c7SWei Liu V9fsPDU *pdu = opaque; 33381d203986SGreg Kurz V9fsState *s = pdu->s; 333960ce86c7SWei Liu 334060ce86c7SWei Liu v9fs_stat_init(&v9stat); 334160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 334260ce86c7SWei Liu if (err < 0) { 334360ce86c7SWei Liu goto out_nofid; 334460ce86c7SWei Liu } 334560ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 334660ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 334760ce86c7SWei Liu 334860ce86c7SWei Liu fidp = get_fid(pdu, fid); 334960ce86c7SWei Liu if (fidp == NULL) { 335060ce86c7SWei Liu err = -EINVAL; 335160ce86c7SWei Liu goto out_nofid; 335260ce86c7SWei Liu } 335360ce86c7SWei Liu /* do we need to sync the file? */ 335460ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 335560ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 335660ce86c7SWei Liu goto out; 335760ce86c7SWei Liu } 335860ce86c7SWei Liu if (v9stat.mode != -1) { 335960ce86c7SWei Liu uint32_t v9_mode; 336060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 336160ce86c7SWei Liu if (err < 0) { 336260ce86c7SWei Liu goto out; 336360ce86c7SWei Liu } 336460ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 336560ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 336660ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 336760ce86c7SWei Liu /* Attempting to change the type */ 336860ce86c7SWei Liu err = -EIO; 336960ce86c7SWei Liu goto out; 337060ce86c7SWei Liu } 337160ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 337260ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 337360ce86c7SWei Liu &v9stat.extension)); 337460ce86c7SWei Liu if (err < 0) { 337560ce86c7SWei Liu goto out; 337660ce86c7SWei Liu } 337760ce86c7SWei Liu } 337860ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 337960ce86c7SWei Liu struct timespec times[2]; 338060ce86c7SWei Liu if (v9stat.atime != -1) { 338160ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 338260ce86c7SWei Liu times[0].tv_nsec = 0; 338360ce86c7SWei Liu } else { 338460ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 338560ce86c7SWei Liu } 338660ce86c7SWei Liu if (v9stat.mtime != -1) { 338760ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 338860ce86c7SWei Liu times[1].tv_nsec = 0; 338960ce86c7SWei Liu } else { 339060ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 339160ce86c7SWei Liu } 339260ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 339360ce86c7SWei Liu if (err < 0) { 339460ce86c7SWei Liu goto out; 339560ce86c7SWei Liu } 339660ce86c7SWei Liu } 339760ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 339860ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 339960ce86c7SWei Liu if (err < 0) { 340060ce86c7SWei Liu goto out; 340160ce86c7SWei Liu } 340260ce86c7SWei Liu } 340360ce86c7SWei Liu if (v9stat.name.size != 0) { 34041d203986SGreg Kurz v9fs_path_write_lock(s); 340560ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 34061d203986SGreg Kurz v9fs_path_unlock(s); 340760ce86c7SWei Liu if (err < 0) { 340860ce86c7SWei Liu goto out; 340960ce86c7SWei Liu } 341060ce86c7SWei Liu } 341160ce86c7SWei Liu if (v9stat.length != -1) { 341260ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 341360ce86c7SWei Liu if (err < 0) { 341460ce86c7SWei Liu goto out; 341560ce86c7SWei Liu } 341660ce86c7SWei Liu } 341760ce86c7SWei Liu err = offset; 341860ce86c7SWei Liu out: 341960ce86c7SWei Liu put_fid(pdu, fidp); 342060ce86c7SWei Liu out_nofid: 342160ce86c7SWei Liu v9fs_stat_free(&v9stat); 342260ce86c7SWei Liu pdu_complete(pdu, err); 342360ce86c7SWei Liu } 342460ce86c7SWei Liu 342560ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 342660ce86c7SWei Liu { 342760ce86c7SWei Liu uint32_t f_type; 342860ce86c7SWei Liu uint32_t f_bsize; 342960ce86c7SWei Liu uint64_t f_blocks; 343060ce86c7SWei Liu uint64_t f_bfree; 343160ce86c7SWei Liu uint64_t f_bavail; 343260ce86c7SWei Liu uint64_t f_files; 343360ce86c7SWei Liu uint64_t f_ffree; 343460ce86c7SWei Liu uint64_t fsid_val; 343560ce86c7SWei Liu uint32_t f_namelen; 343660ce86c7SWei Liu size_t offset = 7; 343760ce86c7SWei Liu int32_t bsize_factor; 343860ce86c7SWei Liu 343960ce86c7SWei Liu /* 344060ce86c7SWei Liu * compute bsize factor based on host file system block size 344160ce86c7SWei Liu * and client msize 344260ce86c7SWei Liu */ 344360ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 344460ce86c7SWei Liu if (!bsize_factor) { 344560ce86c7SWei Liu bsize_factor = 1; 344660ce86c7SWei Liu } 344760ce86c7SWei Liu f_type = stbuf->f_type; 344860ce86c7SWei Liu f_bsize = stbuf->f_bsize; 344960ce86c7SWei Liu f_bsize *= bsize_factor; 345060ce86c7SWei Liu /* 345160ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 345260ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 345360ce86c7SWei Liu * blocks by bsize factor 345460ce86c7SWei Liu */ 345560ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 345660ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 345760ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 345860ce86c7SWei Liu f_files = stbuf->f_files; 345960ce86c7SWei Liu f_ffree = stbuf->f_ffree; 346060ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 346160ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 346260ce86c7SWei Liu f_namelen = stbuf->f_namelen; 346360ce86c7SWei Liu 346460ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 346560ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 346660ce86c7SWei Liu f_bavail, f_files, f_ffree, 346760ce86c7SWei Liu fsid_val, f_namelen); 346860ce86c7SWei Liu } 346960ce86c7SWei Liu 34708440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 347160ce86c7SWei Liu { 347260ce86c7SWei Liu int32_t fid; 347360ce86c7SWei Liu ssize_t retval = 0; 347460ce86c7SWei Liu size_t offset = 7; 347560ce86c7SWei Liu V9fsFidState *fidp; 347660ce86c7SWei Liu struct statfs stbuf; 347760ce86c7SWei Liu V9fsPDU *pdu = opaque; 347860ce86c7SWei Liu V9fsState *s = pdu->s; 347960ce86c7SWei Liu 348060ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 348160ce86c7SWei Liu if (retval < 0) { 348260ce86c7SWei Liu goto out_nofid; 348360ce86c7SWei Liu } 348460ce86c7SWei Liu fidp = get_fid(pdu, fid); 348560ce86c7SWei Liu if (fidp == NULL) { 348660ce86c7SWei Liu retval = -ENOENT; 348760ce86c7SWei Liu goto out_nofid; 348860ce86c7SWei Liu } 348960ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 349060ce86c7SWei Liu if (retval < 0) { 349160ce86c7SWei Liu goto out; 349260ce86c7SWei Liu } 349360ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 349460ce86c7SWei Liu if (retval < 0) { 349560ce86c7SWei Liu goto out; 349660ce86c7SWei Liu } 349760ce86c7SWei Liu retval += offset; 349860ce86c7SWei Liu out: 349960ce86c7SWei Liu put_fid(pdu, fidp); 350060ce86c7SWei Liu out_nofid: 350160ce86c7SWei Liu pdu_complete(pdu, retval); 350260ce86c7SWei Liu } 350360ce86c7SWei Liu 35048440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 350560ce86c7SWei Liu { 350660ce86c7SWei Liu 350760ce86c7SWei Liu int mode; 350860ce86c7SWei Liu gid_t gid; 350960ce86c7SWei Liu int32_t fid; 351060ce86c7SWei Liu V9fsQID qid; 351160ce86c7SWei Liu int err = 0; 351260ce86c7SWei Liu int major, minor; 351360ce86c7SWei Liu size_t offset = 7; 351460ce86c7SWei Liu V9fsString name; 351560ce86c7SWei Liu struct stat stbuf; 351660ce86c7SWei Liu V9fsFidState *fidp; 351760ce86c7SWei Liu V9fsPDU *pdu = opaque; 351860ce86c7SWei Liu 351960ce86c7SWei Liu v9fs_string_init(&name); 352060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 352160ce86c7SWei Liu &major, &minor, &gid); 352260ce86c7SWei Liu if (err < 0) { 352360ce86c7SWei Liu goto out_nofid; 352460ce86c7SWei Liu } 352560ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 352660ce86c7SWei Liu 3527fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3528fff39a7aSGreg Kurz err = -ENOENT; 3529fff39a7aSGreg Kurz goto out_nofid; 3530fff39a7aSGreg Kurz } 3531fff39a7aSGreg Kurz 3532805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3533805b5d98SGreg Kurz err = -EEXIST; 3534805b5d98SGreg Kurz goto out_nofid; 3535805b5d98SGreg Kurz } 3536805b5d98SGreg Kurz 353760ce86c7SWei Liu fidp = get_fid(pdu, fid); 353860ce86c7SWei Liu if (fidp == NULL) { 353960ce86c7SWei Liu err = -ENOENT; 354060ce86c7SWei Liu goto out_nofid; 354160ce86c7SWei Liu } 354260ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 354360ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 354460ce86c7SWei Liu if (err < 0) { 354560ce86c7SWei Liu goto out; 354660ce86c7SWei Liu } 35473b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 35483b5ee9e8SAntonios Motakis if (err < 0) { 35493b5ee9e8SAntonios Motakis goto out; 35503b5ee9e8SAntonios Motakis } 355160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 355260ce86c7SWei Liu if (err < 0) { 355360ce86c7SWei Liu goto out; 355460ce86c7SWei Liu } 355560ce86c7SWei Liu err += offset; 355660ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 355760ce86c7SWei Liu qid.type, qid.version, qid.path); 355860ce86c7SWei Liu out: 355960ce86c7SWei Liu put_fid(pdu, fidp); 356060ce86c7SWei Liu out_nofid: 356160ce86c7SWei Liu pdu_complete(pdu, err); 356260ce86c7SWei Liu v9fs_string_free(&name); 356360ce86c7SWei Liu } 356460ce86c7SWei Liu 356560ce86c7SWei Liu /* 356660ce86c7SWei Liu * Implement posix byte range locking code 356760ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 356860ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 356960ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 357060ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 357160ce86c7SWei Liu * So when a TLOCK request comes, always return success 357260ce86c7SWei Liu */ 35738440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 357460ce86c7SWei Liu { 357560ce86c7SWei Liu V9fsFlock flock; 357660ce86c7SWei Liu size_t offset = 7; 357760ce86c7SWei Liu struct stat stbuf; 357860ce86c7SWei Liu V9fsFidState *fidp; 357960ce86c7SWei Liu int32_t fid, err = 0; 358060ce86c7SWei Liu V9fsPDU *pdu = opaque; 358160ce86c7SWei Liu 358260ce86c7SWei Liu v9fs_string_init(&flock.client_id); 358360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 358460ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 358560ce86c7SWei Liu &flock.proc_id, &flock.client_id); 358660ce86c7SWei Liu if (err < 0) { 358760ce86c7SWei Liu goto out_nofid; 358860ce86c7SWei Liu } 358960ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 359060ce86c7SWei Liu flock.type, flock.start, flock.length); 359160ce86c7SWei Liu 359260ce86c7SWei Liu 359360ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 359460ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 359560ce86c7SWei Liu err = -EINVAL; 359660ce86c7SWei Liu goto out_nofid; 359760ce86c7SWei Liu } 359860ce86c7SWei Liu fidp = get_fid(pdu, fid); 359960ce86c7SWei Liu if (fidp == NULL) { 360060ce86c7SWei Liu err = -ENOENT; 360160ce86c7SWei Liu goto out_nofid; 360260ce86c7SWei Liu } 360360ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 360460ce86c7SWei Liu if (err < 0) { 360560ce86c7SWei Liu goto out; 360660ce86c7SWei Liu } 36074bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 36084bae2b39SPaolo Bonzini if (err < 0) { 36094bae2b39SPaolo Bonzini goto out; 36104bae2b39SPaolo Bonzini } 36114bae2b39SPaolo Bonzini err += offset; 36124bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 361360ce86c7SWei Liu out: 361460ce86c7SWei Liu put_fid(pdu, fidp); 361560ce86c7SWei Liu out_nofid: 361660ce86c7SWei Liu pdu_complete(pdu, err); 361760ce86c7SWei Liu v9fs_string_free(&flock.client_id); 361860ce86c7SWei Liu } 361960ce86c7SWei Liu 362060ce86c7SWei Liu /* 362160ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 362260ce86c7SWei Liu * handling is done by client's VFS layer. 362360ce86c7SWei Liu */ 36248440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 362560ce86c7SWei Liu { 362660ce86c7SWei Liu size_t offset = 7; 362760ce86c7SWei Liu struct stat stbuf; 362860ce86c7SWei Liu V9fsFidState *fidp; 362960ce86c7SWei Liu V9fsGetlock glock; 363060ce86c7SWei Liu int32_t fid, err = 0; 363160ce86c7SWei Liu V9fsPDU *pdu = opaque; 363260ce86c7SWei Liu 363360ce86c7SWei Liu v9fs_string_init(&glock.client_id); 363460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 363560ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 363660ce86c7SWei Liu &glock.client_id); 363760ce86c7SWei Liu if (err < 0) { 363860ce86c7SWei Liu goto out_nofid; 363960ce86c7SWei Liu } 364060ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 364160ce86c7SWei Liu glock.type, glock.start, glock.length); 364260ce86c7SWei Liu 364360ce86c7SWei Liu fidp = get_fid(pdu, fid); 364460ce86c7SWei Liu if (fidp == NULL) { 364560ce86c7SWei Liu err = -ENOENT; 364660ce86c7SWei Liu goto out_nofid; 364760ce86c7SWei Liu } 364860ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 364960ce86c7SWei Liu if (err < 0) { 365060ce86c7SWei Liu goto out; 365160ce86c7SWei Liu } 365260ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 365360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 365460ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 365560ce86c7SWei Liu &glock.client_id); 365660ce86c7SWei Liu if (err < 0) { 365760ce86c7SWei Liu goto out; 365860ce86c7SWei Liu } 365960ce86c7SWei Liu err += offset; 366060ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 366160ce86c7SWei Liu glock.length, glock.proc_id); 366260ce86c7SWei Liu out: 366360ce86c7SWei Liu put_fid(pdu, fidp); 366460ce86c7SWei Liu out_nofid: 366560ce86c7SWei Liu pdu_complete(pdu, err); 366660ce86c7SWei Liu v9fs_string_free(&glock.client_id); 366760ce86c7SWei Liu } 366860ce86c7SWei Liu 36698440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 367060ce86c7SWei Liu { 367160ce86c7SWei Liu V9fsPDU *pdu = opaque; 367260ce86c7SWei Liu size_t offset = 7; 367360ce86c7SWei Liu int32_t fid; 367460ce86c7SWei Liu struct stat stbuf; 367560ce86c7SWei Liu V9fsQID qid; 367660ce86c7SWei Liu V9fsString name; 367760ce86c7SWei Liu V9fsFidState *fidp; 367860ce86c7SWei Liu gid_t gid; 367960ce86c7SWei Liu int mode; 368060ce86c7SWei Liu int err = 0; 368160ce86c7SWei Liu 368260ce86c7SWei Liu v9fs_string_init(&name); 368360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 368460ce86c7SWei Liu if (err < 0) { 368560ce86c7SWei Liu goto out_nofid; 368660ce86c7SWei Liu } 368760ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 368860ce86c7SWei Liu 3689fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3690fff39a7aSGreg Kurz err = -ENOENT; 3691fff39a7aSGreg Kurz goto out_nofid; 3692fff39a7aSGreg Kurz } 3693fff39a7aSGreg Kurz 3694805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3695805b5d98SGreg Kurz err = -EEXIST; 3696805b5d98SGreg Kurz goto out_nofid; 3697805b5d98SGreg Kurz } 3698805b5d98SGreg Kurz 369960ce86c7SWei Liu fidp = get_fid(pdu, fid); 370060ce86c7SWei Liu if (fidp == NULL) { 370160ce86c7SWei Liu err = -ENOENT; 370260ce86c7SWei Liu goto out_nofid; 370360ce86c7SWei Liu } 370460ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 370560ce86c7SWei Liu if (err < 0) { 370660ce86c7SWei Liu goto out; 370760ce86c7SWei Liu } 37083b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 37093b5ee9e8SAntonios Motakis if (err < 0) { 37103b5ee9e8SAntonios Motakis goto out; 37113b5ee9e8SAntonios Motakis } 371260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 371360ce86c7SWei Liu if (err < 0) { 371460ce86c7SWei Liu goto out; 371560ce86c7SWei Liu } 371660ce86c7SWei Liu err += offset; 371760ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 371860ce86c7SWei Liu qid.type, qid.version, qid.path, err); 371960ce86c7SWei Liu out: 372060ce86c7SWei Liu put_fid(pdu, fidp); 372160ce86c7SWei Liu out_nofid: 372260ce86c7SWei Liu pdu_complete(pdu, err); 372360ce86c7SWei Liu v9fs_string_free(&name); 372460ce86c7SWei Liu } 372560ce86c7SWei Liu 37268440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 372760ce86c7SWei Liu { 372860ce86c7SWei Liu int64_t size; 372960ce86c7SWei Liu V9fsString name; 373060ce86c7SWei Liu ssize_t err = 0; 373160ce86c7SWei Liu size_t offset = 7; 373260ce86c7SWei Liu int32_t fid, newfid; 373360ce86c7SWei Liu V9fsFidState *file_fidp; 373460ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 373560ce86c7SWei Liu V9fsPDU *pdu = opaque; 373660ce86c7SWei Liu V9fsState *s = pdu->s; 373760ce86c7SWei Liu 373860ce86c7SWei Liu v9fs_string_init(&name); 373960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 374060ce86c7SWei Liu if (err < 0) { 374160ce86c7SWei Liu goto out_nofid; 374260ce86c7SWei Liu } 374360ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 374460ce86c7SWei Liu 374560ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 374660ce86c7SWei Liu if (file_fidp == NULL) { 374760ce86c7SWei Liu err = -ENOENT; 374860ce86c7SWei Liu goto out_nofid; 374960ce86c7SWei Liu } 375060ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 375160ce86c7SWei Liu if (xattr_fidp == NULL) { 375260ce86c7SWei Liu err = -EINVAL; 375360ce86c7SWei Liu goto out; 375460ce86c7SWei Liu } 375560ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3756ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 375760ce86c7SWei Liu /* 375860ce86c7SWei Liu * listxattr request. Get the size first 375960ce86c7SWei Liu */ 376060ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 376160ce86c7SWei Liu if (size < 0) { 376260ce86c7SWei Liu err = size; 376360ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 376460ce86c7SWei Liu goto out; 376560ce86c7SWei Liu } 376660ce86c7SWei Liu /* 376760ce86c7SWei Liu * Read the xattr value 376860ce86c7SWei Liu */ 376960ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 377060ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3771dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37727bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3773a647502cSKeno Fischer if (size) { 377460ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 377560ce86c7SWei Liu xattr_fidp->fs.xattr.value, 377660ce86c7SWei Liu xattr_fidp->fs.xattr.len); 377760ce86c7SWei Liu if (err < 0) { 377860ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 377960ce86c7SWei Liu goto out; 378060ce86c7SWei Liu } 378160ce86c7SWei Liu } 378260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 378360ce86c7SWei Liu if (err < 0) { 378460ce86c7SWei Liu goto out; 378560ce86c7SWei Liu } 378660ce86c7SWei Liu err += offset; 378760ce86c7SWei Liu } else { 378860ce86c7SWei Liu /* 378960ce86c7SWei Liu * specific xattr fid. We check for xattr 379060ce86c7SWei Liu * presence also collect the xattr size 379160ce86c7SWei Liu */ 379260ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 379360ce86c7SWei Liu &name, NULL, 0); 379460ce86c7SWei Liu if (size < 0) { 379560ce86c7SWei Liu err = size; 379660ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 379760ce86c7SWei Liu goto out; 379860ce86c7SWei Liu } 379960ce86c7SWei Liu /* 380060ce86c7SWei Liu * Read the xattr value 380160ce86c7SWei Liu */ 380260ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 380360ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3804dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38057bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3806a647502cSKeno Fischer if (size) { 380760ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 380860ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 380960ce86c7SWei Liu xattr_fidp->fs.xattr.len); 381060ce86c7SWei Liu if (err < 0) { 381160ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 381260ce86c7SWei Liu goto out; 381360ce86c7SWei Liu } 381460ce86c7SWei Liu } 381560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 381660ce86c7SWei Liu if (err < 0) { 381760ce86c7SWei Liu goto out; 381860ce86c7SWei Liu } 381960ce86c7SWei Liu err += offset; 382060ce86c7SWei Liu } 382160ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 382260ce86c7SWei Liu out: 382360ce86c7SWei Liu put_fid(pdu, file_fidp); 382460ce86c7SWei Liu if (xattr_fidp) { 382560ce86c7SWei Liu put_fid(pdu, xattr_fidp); 382660ce86c7SWei Liu } 382760ce86c7SWei Liu out_nofid: 382860ce86c7SWei Liu pdu_complete(pdu, err); 382960ce86c7SWei Liu v9fs_string_free(&name); 383060ce86c7SWei Liu } 383160ce86c7SWei Liu 38328440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 383360ce86c7SWei Liu { 3834aca6897fSKeno Fischer int flags, rflags = 0; 383560ce86c7SWei Liu int32_t fid; 38363b79ef2cSGreg Kurz uint64_t size; 383760ce86c7SWei Liu ssize_t err = 0; 383860ce86c7SWei Liu V9fsString name; 383960ce86c7SWei Liu size_t offset = 7; 384060ce86c7SWei Liu V9fsFidState *file_fidp; 384160ce86c7SWei Liu V9fsFidState *xattr_fidp; 384260ce86c7SWei Liu V9fsPDU *pdu = opaque; 384360ce86c7SWei Liu 384460ce86c7SWei Liu v9fs_string_init(&name); 384560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 384660ce86c7SWei Liu if (err < 0) { 384760ce86c7SWei Liu goto out_nofid; 384860ce86c7SWei Liu } 384960ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 385060ce86c7SWei Liu 3851aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3852aca6897fSKeno Fischer err = -EINVAL; 3853aca6897fSKeno Fischer goto out_nofid; 3854aca6897fSKeno Fischer } 3855aca6897fSKeno Fischer 3856aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3857aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3858aca6897fSKeno Fischer } 3859aca6897fSKeno Fischer 3860aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3861aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3862aca6897fSKeno Fischer } 3863aca6897fSKeno Fischer 38643b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 38653b79ef2cSGreg Kurz err = -E2BIG; 38663b79ef2cSGreg Kurz goto out_nofid; 38673b79ef2cSGreg Kurz } 38683b79ef2cSGreg Kurz 386960ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 387060ce86c7SWei Liu if (file_fidp == NULL) { 387160ce86c7SWei Liu err = -EINVAL; 387260ce86c7SWei Liu goto out_nofid; 387360ce86c7SWei Liu } 3874dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3875dd654e03SGreg Kurz err = -EINVAL; 3876dd654e03SGreg Kurz goto out_put_fid; 3877dd654e03SGreg Kurz } 3878dd654e03SGreg Kurz 387960ce86c7SWei Liu /* Make the file fid point to xattr */ 388060ce86c7SWei Liu xattr_fidp = file_fidp; 388160ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 388260ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3883dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 388460ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3885aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 388660ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 388760ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3888eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 388960ce86c7SWei Liu err = offset; 3890dd654e03SGreg Kurz out_put_fid: 389160ce86c7SWei Liu put_fid(pdu, file_fidp); 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_readlink(void *opaque) 389860ce86c7SWei Liu { 389960ce86c7SWei Liu V9fsPDU *pdu = opaque; 390060ce86c7SWei Liu size_t offset = 7; 390160ce86c7SWei Liu V9fsString target; 390260ce86c7SWei Liu int32_t fid; 390360ce86c7SWei Liu int err = 0; 390460ce86c7SWei Liu V9fsFidState *fidp; 390560ce86c7SWei Liu 390660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 390760ce86c7SWei Liu if (err < 0) { 390860ce86c7SWei Liu goto out_nofid; 390960ce86c7SWei Liu } 391060ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 391160ce86c7SWei Liu fidp = get_fid(pdu, fid); 391260ce86c7SWei Liu if (fidp == NULL) { 391360ce86c7SWei Liu err = -ENOENT; 391460ce86c7SWei Liu goto out_nofid; 391560ce86c7SWei Liu } 391660ce86c7SWei Liu 391760ce86c7SWei Liu v9fs_string_init(&target); 391860ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 391960ce86c7SWei Liu if (err < 0) { 392060ce86c7SWei Liu goto out; 392160ce86c7SWei Liu } 392260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 392360ce86c7SWei Liu if (err < 0) { 392460ce86c7SWei Liu v9fs_string_free(&target); 392560ce86c7SWei Liu goto out; 392660ce86c7SWei Liu } 392760ce86c7SWei Liu err += offset; 392860ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 392960ce86c7SWei Liu v9fs_string_free(&target); 393060ce86c7SWei Liu out: 393160ce86c7SWei Liu put_fid(pdu, fidp); 393260ce86c7SWei Liu out_nofid: 393360ce86c7SWei Liu pdu_complete(pdu, err); 393460ce86c7SWei Liu } 393560ce86c7SWei Liu 393660ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 393760ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 393860ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 393960ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 394060ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 394160ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 394260ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 394360ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 394460ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 394560ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 394660ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 394760ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 394860ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 394960ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 395060ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 395160ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 395260ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 395360ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 395460ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 395560ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 395660ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 395760ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 395860ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 395960ce86c7SWei Liu [P9_TREAD] = v9fs_read, 396060ce86c7SWei Liu #if 0 396160ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 396260ce86c7SWei Liu #endif 396360ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 396460ce86c7SWei Liu [P9_TLINK] = v9fs_link, 396560ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 396660ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 396760ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 396860ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 396960ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 397060ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 397160ce86c7SWei Liu }; 397260ce86c7SWei Liu 39738440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 397460ce86c7SWei Liu { 397560ce86c7SWei Liu V9fsPDU *pdu = opaque; 397660ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 397760ce86c7SWei Liu } 397860ce86c7SWei Liu 39798440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 398060ce86c7SWei Liu { 398160ce86c7SWei Liu V9fsPDU *pdu = opaque; 398260ce86c7SWei Liu pdu_complete(pdu, -EROFS); 398360ce86c7SWei Liu } 398460ce86c7SWei Liu 398560ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 398660ce86c7SWei Liu { 398760ce86c7SWei Liu switch (pdu->id) { 398860ce86c7SWei Liu case P9_TREADDIR: 398960ce86c7SWei Liu case P9_TSTATFS: 399060ce86c7SWei Liu case P9_TGETATTR: 399160ce86c7SWei Liu case P9_TXATTRWALK: 399260ce86c7SWei Liu case P9_TLOCK: 399360ce86c7SWei Liu case P9_TGETLOCK: 399460ce86c7SWei Liu case P9_TREADLINK: 399560ce86c7SWei Liu case P9_TVERSION: 399660ce86c7SWei Liu case P9_TLOPEN: 399760ce86c7SWei Liu case P9_TATTACH: 399860ce86c7SWei Liu case P9_TSTAT: 399960ce86c7SWei Liu case P9_TWALK: 400060ce86c7SWei Liu case P9_TCLUNK: 400160ce86c7SWei Liu case P9_TFSYNC: 400260ce86c7SWei Liu case P9_TOPEN: 400360ce86c7SWei Liu case P9_TREAD: 400460ce86c7SWei Liu case P9_TAUTH: 400560ce86c7SWei Liu case P9_TFLUSH: 400660ce86c7SWei Liu return 1; 400760ce86c7SWei Liu default: 400860ce86c7SWei Liu return 0; 400960ce86c7SWei Liu } 401060ce86c7SWei Liu } 401160ce86c7SWei Liu 4012506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 401360ce86c7SWei Liu { 401460ce86c7SWei Liu Coroutine *co; 401560ce86c7SWei Liu CoroutineEntry *handler; 401660ce86c7SWei Liu V9fsState *s = pdu->s; 401760ce86c7SWei Liu 4018506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4019506f3275SGreg Kurz pdu->id = hdr->id; 4020506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4021506f3275SGreg Kurz 402260ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 402360ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 402460ce86c7SWei Liu handler = v9fs_op_not_supp; 4025d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4026d1471233SGreg Kurz handler = v9fs_fs_ro; 402760ce86c7SWei Liu } else { 402860ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 402960ce86c7SWei Liu } 403060ce86c7SWei Liu 4031506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 40320b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 40330b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 403460ce86c7SWei Liu } 403560ce86c7SWei Liu 40362a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4037066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4038066eb006SGreg Kurz Error **errp) 40392a0c56aaSWei Liu { 404092c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 40412a0c56aaSWei Liu int i, len; 40422a0c56aaSWei Liu struct stat stat; 40432a0c56aaSWei Liu FsDriverEntry *fse; 40442a0c56aaSWei Liu V9fsPath path; 40452a0c56aaSWei Liu int rc = 1; 40462a0c56aaSWei Liu 4047066eb006SGreg Kurz assert(!s->transport); 4048066eb006SGreg Kurz s->transport = t; 4049066eb006SGreg Kurz 40502a0c56aaSWei Liu /* initialize pdu allocator */ 40512a0c56aaSWei Liu QLIST_INIT(&s->free_list); 40522a0c56aaSWei Liu QLIST_INIT(&s->active_list); 40530d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4054583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4055583f21f8SStefano Stabellini s->pdus[i].s = s; 4056583f21f8SStefano Stabellini s->pdus[i].idx = i; 40572a0c56aaSWei Liu } 40582a0c56aaSWei Liu 40592a0c56aaSWei Liu v9fs_path_init(&path); 40602a0c56aaSWei Liu 40612a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 40622a0c56aaSWei Liu 40632a0c56aaSWei Liu if (!fse) { 40642a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 40652a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 40662a0c56aaSWei Liu "id = %s", 40672a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 40682a0c56aaSWei Liu goto out; 40692a0c56aaSWei Liu } 40702a0c56aaSWei Liu 40712a0c56aaSWei Liu if (!s->fsconf.tag) { 40722a0c56aaSWei Liu /* we haven't specified a mount_tag */ 40732a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 40742a0c56aaSWei Liu s->fsconf.fsdev_id); 40752a0c56aaSWei Liu goto out; 40762a0c56aaSWei Liu } 40772a0c56aaSWei Liu 40782a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 40792a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 40802a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 40812a0c56aaSWei Liu len = strlen(s->fsconf.tag); 40822a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 40832a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 40842a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 40852a0c56aaSWei Liu goto out; 40862a0c56aaSWei Liu } 40872a0c56aaSWei Liu 40882a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 40892a0c56aaSWei Liu s->ctx.uid = -1; 40902a0c56aaSWei Liu 40912a0c56aaSWei Liu s->ops = fse->ops; 40922a0c56aaSWei Liu 4093b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4094b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4095b96feb2cSTobias Schramm 4096feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 40972a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 40982a0c56aaSWei Liu 409965603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 410065603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 410165603a80SGreg Kurz s->fsconf.fsdev_id); 41022a0c56aaSWei Liu goto out; 41032a0c56aaSWei Liu } 41042a0c56aaSWei Liu 41052a0c56aaSWei Liu /* 41062a0c56aaSWei Liu * Check details of export path, We need to use fs driver 41072a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 41082a0c56aaSWei Liu * use co-routines here. 41092a0c56aaSWei Liu */ 41102a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 41112a0c56aaSWei Liu error_setg(errp, 41122a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 41132a0c56aaSWei Liu goto out; 41142a0c56aaSWei Liu } 41152a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41162a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41172a0c56aaSWei Liu goto out; 41182a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41192a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41202a0c56aaSWei Liu goto out; 41212a0c56aaSWei Liu } 4122b8bbdb88SPradeep Jagadeesh 41233b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41243b5ee9e8SAntonios Motakis 41256b6aa828SChristian Schoenebeck /* init inode remapping : */ 41266b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 41276b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 41286b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 41296b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 41306b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 41311a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 41326b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 41336b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4134f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 41351a6ed33cSAntonios Motakis 4136b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4137b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4138b8bbdb88SPradeep Jagadeesh 41392a0c56aaSWei Liu rc = 0; 41402a0c56aaSWei Liu out: 41412a0c56aaSWei Liu if (rc) { 4142b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4143702dbcc2SLi Qiang } 41442a0c56aaSWei Liu v9fs_path_free(&path); 41452a0c56aaSWei Liu return rc; 41462a0c56aaSWei Liu } 41472a0c56aaSWei Liu 4148b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 41492a0c56aaSWei Liu { 4150c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4151702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4152702dbcc2SLi Qiang } 4153c0da0cb7SGreg Kurz if (s->ctx.fst) { 4154b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4155c0da0cb7SGreg Kurz } 41562a0c56aaSWei Liu g_free(s->tag); 41576b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4158f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4159f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 41604774718eSLi Qiang g_free(s->ctx.fs_root); 41612a0c56aaSWei Liu } 41622a0c56aaSWei Liu 41630e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 41640e44a0fdSGreg Kurz V9fsPDU pdu; 41650e44a0fdSGreg Kurz bool done; 41660e44a0fdSGreg Kurz } VirtfsCoResetData; 41670e44a0fdSGreg Kurz 41680e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 41690e44a0fdSGreg Kurz { 41700e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 41710e44a0fdSGreg Kurz 41720e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 41730e44a0fdSGreg Kurz data->done = true; 41740e44a0fdSGreg Kurz } 41750e44a0fdSGreg Kurz 41760e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 41770e44a0fdSGreg Kurz { 41780e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 41790e44a0fdSGreg Kurz Coroutine *co; 41800e44a0fdSGreg Kurz 41810e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 41820e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41830e44a0fdSGreg Kurz } 41840e44a0fdSGreg Kurz 41850e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 41860e44a0fdSGreg Kurz qemu_coroutine_enter(co); 41870e44a0fdSGreg Kurz 41880e44a0fdSGreg Kurz while (!data.done) { 41890e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41900e44a0fdSGreg Kurz } 41910e44a0fdSGreg Kurz } 41920e44a0fdSGreg Kurz 419360ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 419460ce86c7SWei Liu { 419560ce86c7SWei Liu struct rlimit rlim; 419660ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 419763325b18SGreg Kurz error_report("Failed to get the resource limit"); 419860ce86c7SWei Liu exit(1); 419960ce86c7SWei Liu } 420060ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 420160ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 420260ce86c7SWei Liu } 4203