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 263*feabd6cfSGreg 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 298*feabd6cfSGreg 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; 314*feabd6cfSGreg Kurz QSIMPLEQ_INSERT_HEAD(&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 { 403*feabd6cfSGreg Kurz V9fsFidState *fidp; 40460ce86c7SWei Liu 405*feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 406*feabd6cfSGreg Kurz if (fidp->fid == fid) { 407*feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 4082e53160fSGreg Kurz fidp->clunked = true; 40960ce86c7SWei Liu return fidp; 41060ce86c7SWei Liu } 411*feabd6cfSGreg Kurz } 412*feabd6cfSGreg Kurz return NULL; 413*feabd6cfSGreg 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; 41960ce86c7SWei Liu V9fsFidState *f, *reclaim_list = NULL; 42060ce86c7SWei Liu 421*feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 42260ce86c7SWei Liu /* 42360ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 42460ce86c7SWei Liu * for them and skip them. Also skip fids 42560ce86c7SWei Liu * currently being operated on. 42660ce86c7SWei Liu */ 42760ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 42860ce86c7SWei Liu continue; 42960ce86c7SWei Liu } 43060ce86c7SWei Liu /* 43160ce86c7SWei Liu * if it is a recently referenced fid 43260ce86c7SWei Liu * we leave the fid untouched and clear the 43360ce86c7SWei Liu * reference bit. We come back to it later 43460ce86c7SWei Liu * in the next iteration. (a simple LRU without 43560ce86c7SWei Liu * moving list elements around) 43660ce86c7SWei Liu */ 43760ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 43860ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 43960ce86c7SWei Liu continue; 44060ce86c7SWei Liu } 44160ce86c7SWei Liu /* 44260ce86c7SWei Liu * Add fids to reclaim list. 44360ce86c7SWei Liu */ 44460ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 44560ce86c7SWei Liu if (f->fs.fd != -1) { 44660ce86c7SWei Liu /* 44760ce86c7SWei Liu * Up the reference count so that 44860ce86c7SWei Liu * a clunk request won't free this fid 44960ce86c7SWei Liu */ 45060ce86c7SWei Liu f->ref++; 45160ce86c7SWei Liu f->rclm_lst = reclaim_list; 45260ce86c7SWei Liu reclaim_list = f; 45360ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 45460ce86c7SWei Liu f->fs.fd = -1; 45560ce86c7SWei Liu reclaim_count++; 45660ce86c7SWei Liu } 45760ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 458f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 45960ce86c7SWei Liu /* 46060ce86c7SWei Liu * Up the reference count so that 46160ce86c7SWei Liu * a clunk request won't free this fid 46260ce86c7SWei Liu */ 46360ce86c7SWei Liu f->ref++; 46460ce86c7SWei Liu f->rclm_lst = reclaim_list; 46560ce86c7SWei Liu reclaim_list = f; 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 */ 47960ce86c7SWei Liu while (reclaim_list) { 48060ce86c7SWei Liu f = reclaim_list; 48160ce86c7SWei Liu reclaim_list = f->rclm_lst; 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 f->rclm_lst = NULL; 48860ce86c7SWei Liu /* 48960ce86c7SWei Liu * Now drop the fid reference, free it 49060ce86c7SWei Liu * if clunked. 49160ce86c7SWei Liu */ 49260ce86c7SWei Liu put_fid(pdu, f); 49360ce86c7SWei Liu } 49460ce86c7SWei Liu } 49560ce86c7SWei Liu 4968440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 49760ce86c7SWei Liu { 49860ce86c7SWei Liu int err; 49960ce86c7SWei Liu V9fsState *s = pdu->s; 50089fbea87SGreg Kurz V9fsFidState *fidp; 50160ce86c7SWei Liu 50289fbea87SGreg Kurz again: 503*feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 50460ce86c7SWei Liu if (fidp->path.size != path->size) { 50560ce86c7SWei Liu continue; 50660ce86c7SWei Liu } 50760ce86c7SWei Liu if (!memcmp(fidp->path.data, path->data, path->size)) { 50860ce86c7SWei Liu /* Mark the fid non reclaimable. */ 50960ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 51060ce86c7SWei Liu 51160ce86c7SWei Liu /* reopen the file/dir if already closed */ 51260ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 51360ce86c7SWei Liu if (err < 0) { 514267fcadfSGreg Kurz return err; 51560ce86c7SWei Liu } 51660ce86c7SWei Liu /* 51760ce86c7SWei Liu * Go back to head of fid list because 51860ce86c7SWei Liu * the list could have got updated when 51960ce86c7SWei Liu * switched to the worker thread 52060ce86c7SWei Liu */ 52160ce86c7SWei Liu if (err == 0) { 52289fbea87SGreg Kurz goto again; 52360ce86c7SWei Liu } 52460ce86c7SWei Liu } 52560ce86c7SWei Liu } 52660ce86c7SWei Liu return 0; 52760ce86c7SWei Liu } 52860ce86c7SWei Liu 5298440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 53060ce86c7SWei Liu { 53160ce86c7SWei Liu V9fsState *s = pdu->s; 53279decce3SGreg Kurz V9fsFidState *fidp; 53360ce86c7SWei Liu 53460ce86c7SWei Liu /* Free all fids */ 535*feabd6cfSGreg Kurz while (!QSIMPLEQ_EMPTY(&s->fid_list)) { 5366d54af0eSGreg Kurz /* Get fid */ 537*feabd6cfSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 5386d54af0eSGreg Kurz fidp->ref++; 53960ce86c7SWei Liu 5406d54af0eSGreg Kurz /* Clunk fid */ 541*feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 5422e53160fSGreg Kurz fidp->clunked = true; 5436d54af0eSGreg Kurz 5446d54af0eSGreg Kurz put_fid(pdu, fidp); 54560ce86c7SWei Liu } 54660ce86c7SWei Liu } 54760ce86c7SWei Liu 54860ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 54960ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 55060ce86c7SWei Liu 55160ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 55260ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 55360ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 55460ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 55560ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 55660ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 55760ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 55860ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 55960ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 56060ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 56160ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 56260ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 56360ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 56460ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 56560ce86c7SWei Liu 56660ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 56760ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 56860ce86c7SWei Liu P9_STAT_MODE_LINK | \ 56960ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 57060ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 57160ce86c7SWei Liu P9_STAT_MODE_SOCKET) 57260ce86c7SWei Liu 5736b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 5746b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 5756b6aa828SChristian Schoenebeck { 5766b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 5776b6aa828SChristian Schoenebeck } 5786b6aa828SChristian Schoenebeck 5796b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 5806b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 5816b6aa828SChristian Schoenebeck { 5826b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 5836b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 5846b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 5856b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 5866b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 5876b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 5886b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 5896b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 5906b6aa828SChristian Schoenebeck } 5916b6aa828SChristian Schoenebeck 5926b6aa828SChristian Schoenebeck /** 5936b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 5946b6aa828SChristian Schoenebeck * 5956b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 5966b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 5976b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 5986b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 5996b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6006b6aa828SChristian Schoenebeck * 6016b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6026b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6036b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6046b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6056b6aa828SChristian Schoenebeck * 6066b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6076b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6086b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6096b6aa828SChristian Schoenebeck */ 6106b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6116b6aa828SChristian Schoenebeck 6126b6aa828SChristian Schoenebeck /** 6136b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6146b6aa828SChristian Schoenebeck * 6156b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6166b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6176b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6186b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6196b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6206b6aa828SChristian Schoenebeck * 6216b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6226b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6236b6aa828SChristian Schoenebeck * 6246b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6256b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6266b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6276b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6286b6aa828SChristian Schoenebeck */ 6296b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6306b6aa828SChristian Schoenebeck { 6316b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6326b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6336b6aa828SChristian Schoenebeck return (VariLenAffix) { 6346b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6356b6aa828SChristian Schoenebeck .value = value, 6366b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6376b6aa828SChristian Schoenebeck }; 6386b6aa828SChristian Schoenebeck } 6396b6aa828SChristian Schoenebeck 6406b6aa828SChristian Schoenebeck /** 6416b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6426b6aa828SChristian Schoenebeck * 6436b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6446b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6456b6aa828SChristian Schoenebeck * after the conversion. 6466b6aa828SChristian Schoenebeck * 6476b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6486b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6496b6aa828SChristian Schoenebeck * versa). 6506b6aa828SChristian Schoenebeck */ 6516b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6526b6aa828SChristian Schoenebeck { 6536b6aa828SChristian Schoenebeck return (VariLenAffix) { 6546b6aa828SChristian Schoenebeck .type = 6556b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6566b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6576b6aa828SChristian Schoenebeck .value = 6586b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6596b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6606b6aa828SChristian Schoenebeck .bits = affix->bits 6616b6aa828SChristian Schoenebeck }; 6626b6aa828SChristian Schoenebeck } 6636b6aa828SChristian Schoenebeck 6646b6aa828SChristian Schoenebeck /** 6656b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6666b6aa828SChristian Schoenebeck * 6676b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6686b6aa828SChristian Schoenebeck * 6696b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6706b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6716b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 6726b6aa828SChristian Schoenebeck * 6736b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 6746b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6756b6aa828SChristian Schoenebeck */ 6766b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 6776b6aa828SChristian Schoenebeck { 6786b6aa828SChristian Schoenebeck VariLenAffix prefix; 6796b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 6806b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 6816b6aa828SChristian Schoenebeck } 6826b6aa828SChristian Schoenebeck 6831a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 6841a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 6851a6ed33cSAntonios Motakis { 6861a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 6871a6ed33cSAntonios Motakis } 6881a6ed33cSAntonios Motakis 689f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 690f3fe4a2dSAntonios Motakis { 691f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 692f3fe4a2dSAntonios Motakis } 693f3fe4a2dSAntonios Motakis 6946b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 6956b6aa828SChristian Schoenebeck { 6966b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 6976b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 6986b6aa828SChristian Schoenebeck } 6996b6aa828SChristian Schoenebeck 7006b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7011a6ed33cSAntonios Motakis { 7021a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7031a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7041a6ed33cSAntonios Motakis } 7051a6ed33cSAntonios Motakis 7066b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 707f3fe4a2dSAntonios Motakis { 708f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 709f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 710f3fe4a2dSAntonios Motakis } 711f3fe4a2dSAntonios Motakis 712f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7131a6ed33cSAntonios Motakis { 7141a6ed33cSAntonios Motakis g_free(p); 7151a6ed33cSAntonios Motakis } 7161a6ed33cSAntonios Motakis 717f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7181a6ed33cSAntonios Motakis { 7191a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7201a6ed33cSAntonios Motakis return; 7211a6ed33cSAntonios Motakis } 722f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7231a6ed33cSAntonios Motakis qht_destroy(ht); 7241a6ed33cSAntonios Motakis } 7251a6ed33cSAntonios Motakis 7266b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7276b6aa828SChristian Schoenebeck { 7286b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7296b6aa828SChristian Schoenebeck } 7306b6aa828SChristian Schoenebeck 7311a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7321a6ed33cSAntonios Motakis { 7336b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7341a6ed33cSAntonios Motakis } 7351a6ed33cSAntonios Motakis 736f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 737f3fe4a2dSAntonios Motakis { 7386b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 739f3fe4a2dSAntonios Motakis } 740f3fe4a2dSAntonios Motakis 7416b6aa828SChristian Schoenebeck /* 7426b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7436b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7446b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7456b6aa828SChristian Schoenebeck * 7466b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7476b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7486b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7496b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7506b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7516b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7526b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7536b6aa828SChristian Schoenebeck */ 7546b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7556b6aa828SChristian Schoenebeck { 7566b6aa828SChristian Schoenebeck QpdEntry lookup = { 7576b6aa828SChristian Schoenebeck .dev = dev 7586b6aa828SChristian Schoenebeck }, *val; 7596b6aa828SChristian Schoenebeck uint32_t hash = dev; 7606b6aa828SChristian Schoenebeck VariLenAffix affix; 7616b6aa828SChristian Schoenebeck 7626b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7636b6aa828SChristian Schoenebeck if (!val) { 7646b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7656b6aa828SChristian Schoenebeck *val = lookup; 7666b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7676b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7686b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7696b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7706b6aa828SChristian Schoenebeck } 7716b6aa828SChristian Schoenebeck return val->prefix_bits; 7726b6aa828SChristian Schoenebeck } 7736b6aa828SChristian Schoenebeck 7746b6aa828SChristian Schoenebeck /** 7756b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 7766b6aa828SChristian Schoenebeck * 7776b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 7786b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 7796b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 7806b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 7816b6aa828SChristian Schoenebeck * guest. 7826b6aa828SChristian Schoenebeck * 7836b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 7846b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 7856b6aa828SChristian Schoenebeck * expected ever to be used at all though. 7866b6aa828SChristian Schoenebeck * 7876b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 7886b6aa828SChristian Schoenebeck * 7896b6aa828SChristian Schoenebeck */ 790f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 791f3fe4a2dSAntonios Motakis uint64_t *path) 792f3fe4a2dSAntonios Motakis { 793f3fe4a2dSAntonios Motakis QpfEntry lookup = { 794f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 795f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 796f3fe4a2dSAntonios Motakis }, *val; 797f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 7986b6aa828SChristian Schoenebeck VariLenAffix affix; 799f3fe4a2dSAntonios Motakis 800f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 801f3fe4a2dSAntonios Motakis 802f3fe4a2dSAntonios Motakis if (!val) { 803f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 804f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 805f3fe4a2dSAntonios Motakis error_report_once( 806f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 807f3fe4a2dSAntonios Motakis "host to guest." 808f3fe4a2dSAntonios Motakis ); 809f3fe4a2dSAntonios Motakis return -ENFILE; 810f3fe4a2dSAntonios Motakis } 811f3fe4a2dSAntonios Motakis 812f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 813f3fe4a2dSAntonios Motakis *val = lookup; 814f3fe4a2dSAntonios Motakis 815f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8166b6aa828SChristian Schoenebeck affix = affixForIndex( 8176b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8186b6aa828SChristian Schoenebeck ); 8196b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8206b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 821f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 822f3fe4a2dSAntonios Motakis } 823f3fe4a2dSAntonios Motakis 824f3fe4a2dSAntonios Motakis *path = val->path; 825f3fe4a2dSAntonios Motakis return 0; 826f3fe4a2dSAntonios Motakis } 827f3fe4a2dSAntonios Motakis 8286b6aa828SChristian Schoenebeck /** 8296b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8301a6ed33cSAntonios Motakis * 8316b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8326b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8336b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8346b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8356b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8366b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8376b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8386b6aa828SChristian Schoenebeck * that is). 8396b6aa828SChristian Schoenebeck * 8406b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8416b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8426b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8436b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8446b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8456b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8466b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8476b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8486b6aa828SChristian Schoenebeck * 8496b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8506b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8516b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8526b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8536b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8546b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8556b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8566b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8576b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8586b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8596b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8606b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8616b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8626b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8636b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8646b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8656b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8661a6ed33cSAntonios Motakis */ 8676b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8681a6ed33cSAntonios Motakis uint64_t *path) 8691a6ed33cSAntonios Motakis { 8706b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8711a6ed33cSAntonios Motakis QppEntry lookup = { 8721a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 8736b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 8741a6ed33cSAntonios Motakis }, *val; 8751a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 8761a6ed33cSAntonios Motakis 8771a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 8781a6ed33cSAntonios Motakis 8791a6ed33cSAntonios Motakis if (!val) { 8806b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 8816b6aa828SChristian Schoenebeck /* we ran out of affixes */ 882f3fe4a2dSAntonios Motakis warn_report_once( 883f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 8841a6ed33cSAntonios Motakis ); 8851a6ed33cSAntonios Motakis return -ENFILE; 8861a6ed33cSAntonios Motakis } 8871a6ed33cSAntonios Motakis 8881a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 8891a6ed33cSAntonios Motakis *val = lookup; 8901a6ed33cSAntonios Motakis 8916b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 8926b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 8936b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 8941a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 8951a6ed33cSAntonios Motakis } 8966b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 8976b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 8981a6ed33cSAntonios Motakis return 0; 8991a6ed33cSAntonios Motakis } 9001a6ed33cSAntonios Motakis 9013b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 90260ce86c7SWei Liu { 9031a6ed33cSAntonios Motakis int err; 90460ce86c7SWei Liu size_t size; 90560ce86c7SWei Liu 9061a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9071a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9086b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 909f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 910f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 911f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 912f3fe4a2dSAntonios Motakis } 9131a6ed33cSAntonios Motakis if (err) { 9141a6ed33cSAntonios Motakis return err; 9151a6ed33cSAntonios Motakis } 9161a6ed33cSAntonios Motakis } else { 9173b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9181a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9191a6ed33cSAntonios Motakis error_report_once( 9201a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9211a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9221a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9231a6ed33cSAntonios Motakis "effective." 9241a6ed33cSAntonios Motakis ); 9251a6ed33cSAntonios Motakis return -ENODEV; 9261a6ed33cSAntonios Motakis } else { 9273b5ee9e8SAntonios Motakis warn_report_once( 9283b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9293b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9301a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9311a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9321a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9333b5ee9e8SAntonios Motakis ); 9343b5ee9e8SAntonios Motakis } 9351a6ed33cSAntonios Motakis } 93660ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 93760ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 93860ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9391a6ed33cSAntonios Motakis } 9401a6ed33cSAntonios Motakis 94160ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 94260ce86c7SWei Liu qidp->type = 0; 94360ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 94460ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 94560ce86c7SWei Liu } 94660ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 94760ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 94860ce86c7SWei Liu } 9493b5ee9e8SAntonios Motakis 9503b5ee9e8SAntonios Motakis return 0; 95160ce86c7SWei Liu } 95260ce86c7SWei Liu 9538440e22eSGreg Kurz static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, 9548440e22eSGreg Kurz V9fsQID *qidp) 95560ce86c7SWei Liu { 95660ce86c7SWei Liu struct stat stbuf; 95760ce86c7SWei Liu int err; 95860ce86c7SWei Liu 95960ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 96060ce86c7SWei Liu if (err < 0) { 96160ce86c7SWei Liu return err; 96260ce86c7SWei Liu } 9633b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, qidp); 9643b5ee9e8SAntonios Motakis if (err < 0) { 9653b5ee9e8SAntonios Motakis return err; 9663b5ee9e8SAntonios Motakis } 96760ce86c7SWei Liu return 0; 96860ce86c7SWei Liu } 96960ce86c7SWei Liu 97060ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 97160ce86c7SWei Liu { 97260ce86c7SWei Liu V9fsPDU *pdu = NULL; 97360ce86c7SWei Liu 97460ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 97560ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 97660ce86c7SWei Liu QLIST_REMOVE(pdu, next); 97760ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 97860ce86c7SWei Liu } 97960ce86c7SWei Liu return pdu; 98060ce86c7SWei Liu } 98160ce86c7SWei Liu 98260ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 98360ce86c7SWei Liu { 98460ce86c7SWei Liu V9fsState *s = pdu->s; 985f74e27bfSGreg Kurz 986f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 98760ce86c7SWei Liu QLIST_REMOVE(pdu, next); 98860ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 98960ce86c7SWei Liu } 99060ce86c7SWei Liu 9918440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 99260ce86c7SWei Liu { 99360ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 99460ce86c7SWei Liu V9fsState *s = pdu->s; 99506a37db7SGreg Kurz int ret; 99660ce86c7SWei Liu 997fc78d5eeSKeno Fischer /* 998fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 999fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1000fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1001fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1002fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1003fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1004fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1005fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1006fc78d5eeSKeno Fischer * transmission of the reply. 1007fc78d5eeSKeno Fischer */ 1008fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1009fc78d5eeSKeno Fischer if (discard) { 1010fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1011fc78d5eeSKeno Fischer pdu->size = 0; 1012fc78d5eeSKeno Fischer goto out_notify; 1013fc78d5eeSKeno Fischer } 1014fc78d5eeSKeno Fischer 101560ce86c7SWei Liu if (len < 0) { 101660ce86c7SWei Liu int err = -len; 101760ce86c7SWei Liu len = 7; 101860ce86c7SWei Liu 101960ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 102060ce86c7SWei Liu V9fsString str; 102160ce86c7SWei Liu 102260ce86c7SWei Liu str.data = strerror(err); 102360ce86c7SWei Liu str.size = strlen(str.data); 102460ce86c7SWei Liu 102506a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 102606a37db7SGreg Kurz if (ret < 0) { 102706a37db7SGreg Kurz goto out_notify; 102806a37db7SGreg Kurz } 102906a37db7SGreg Kurz len += ret; 103060ce86c7SWei Liu id = P9_RERROR; 103160ce86c7SWei Liu } 103260ce86c7SWei Liu 103306a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 103406a37db7SGreg Kurz if (ret < 0) { 103506a37db7SGreg Kurz goto out_notify; 103606a37db7SGreg Kurz } 103706a37db7SGreg Kurz len += ret; 103860ce86c7SWei Liu 103960ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 104060ce86c7SWei Liu id = P9_RLERROR; 104160ce86c7SWei Liu } 104260ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 104360ce86c7SWei Liu } 104460ce86c7SWei Liu 104560ce86c7SWei Liu /* fill out the header */ 104606a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 104706a37db7SGreg Kurz goto out_notify; 104806a37db7SGreg Kurz } 104960ce86c7SWei Liu 105060ce86c7SWei Liu /* keep these in sync */ 105160ce86c7SWei Liu pdu->size = len; 105260ce86c7SWei Liu pdu->id = id; 105360ce86c7SWei Liu 105406a37db7SGreg Kurz out_notify: 1055a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 105660ce86c7SWei Liu 105760ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1058f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 105960ce86c7SWei Liu pdu_free(pdu); 106060ce86c7SWei Liu } 1061f74e27bfSGreg Kurz } 106260ce86c7SWei Liu 106360ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 106460ce86c7SWei Liu { 106560ce86c7SWei Liu mode_t ret; 106660ce86c7SWei Liu 106760ce86c7SWei Liu ret = mode & 0777; 106860ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 106960ce86c7SWei Liu ret |= S_IFDIR; 107060ce86c7SWei Liu } 107160ce86c7SWei Liu 107260ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 107360ce86c7SWei Liu ret |= S_IFLNK; 107460ce86c7SWei Liu } 107560ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 107660ce86c7SWei Liu ret |= S_IFSOCK; 107760ce86c7SWei Liu } 107860ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 107960ce86c7SWei Liu ret |= S_IFIFO; 108060ce86c7SWei Liu } 108160ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 108260ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 108360ce86c7SWei Liu ret |= S_IFCHR; 108460ce86c7SWei Liu } else { 108560ce86c7SWei Liu ret |= S_IFBLK; 108660ce86c7SWei Liu } 108760ce86c7SWei Liu } 108860ce86c7SWei Liu 108960ce86c7SWei Liu if (!(ret & ~0777)) { 109060ce86c7SWei Liu ret |= S_IFREG; 109160ce86c7SWei Liu } 109260ce86c7SWei Liu 109360ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 109460ce86c7SWei Liu ret |= S_ISUID; 109560ce86c7SWei Liu } 109660ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 109760ce86c7SWei Liu ret |= S_ISGID; 109860ce86c7SWei Liu } 109960ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 110060ce86c7SWei Liu ret |= S_ISVTX; 110160ce86c7SWei Liu } 110260ce86c7SWei Liu 110360ce86c7SWei Liu return ret; 110460ce86c7SWei Liu } 110560ce86c7SWei Liu 110660ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 110760ce86c7SWei Liu { 110860ce86c7SWei Liu if (stat->type == -1 && 110960ce86c7SWei Liu stat->dev == -1 && 111087032833SAntonios Motakis stat->qid.type == 0xff && 111187032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 111287032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 111360ce86c7SWei Liu stat->mode == -1 && 111460ce86c7SWei Liu stat->atime == -1 && 111560ce86c7SWei Liu stat->mtime == -1 && 111660ce86c7SWei Liu stat->length == -1 && 111760ce86c7SWei Liu !stat->name.size && 111860ce86c7SWei Liu !stat->uid.size && 111960ce86c7SWei Liu !stat->gid.size && 112060ce86c7SWei Liu !stat->muid.size && 112160ce86c7SWei Liu stat->n_uid == -1 && 112260ce86c7SWei Liu stat->n_gid == -1 && 112360ce86c7SWei Liu stat->n_muid == -1) { 112460ce86c7SWei Liu return 1; 112560ce86c7SWei Liu } 112660ce86c7SWei Liu 112760ce86c7SWei Liu return 0; 112860ce86c7SWei Liu } 112960ce86c7SWei Liu 113060ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 113160ce86c7SWei Liu { 113260ce86c7SWei Liu v9fs_string_init(&stat->name); 113360ce86c7SWei Liu v9fs_string_init(&stat->uid); 113460ce86c7SWei Liu v9fs_string_init(&stat->gid); 113560ce86c7SWei Liu v9fs_string_init(&stat->muid); 113660ce86c7SWei Liu v9fs_string_init(&stat->extension); 113760ce86c7SWei Liu } 113860ce86c7SWei Liu 113960ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 114060ce86c7SWei Liu { 114160ce86c7SWei Liu v9fs_string_free(&stat->name); 114260ce86c7SWei Liu v9fs_string_free(&stat->uid); 114360ce86c7SWei Liu v9fs_string_free(&stat->gid); 114460ce86c7SWei Liu v9fs_string_free(&stat->muid); 114560ce86c7SWei Liu v9fs_string_free(&stat->extension); 114660ce86c7SWei Liu } 114760ce86c7SWei Liu 114860ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 114960ce86c7SWei Liu { 115060ce86c7SWei Liu uint32_t mode; 115160ce86c7SWei Liu 115260ce86c7SWei Liu mode = stbuf->st_mode & 0777; 115360ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 115460ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 115560ce86c7SWei Liu } 115660ce86c7SWei Liu 115760ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 115860ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 115960ce86c7SWei Liu } 116060ce86c7SWei Liu 116160ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 116260ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 116360ce86c7SWei Liu } 116460ce86c7SWei Liu 116560ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 116660ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 116760ce86c7SWei Liu } 116860ce86c7SWei Liu 116960ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 117060ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 117160ce86c7SWei Liu } 117260ce86c7SWei Liu 117360ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 117460ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 117560ce86c7SWei Liu } 117660ce86c7SWei Liu 117760ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 117860ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 117960ce86c7SWei Liu } 118060ce86c7SWei Liu 118160ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 118260ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 118360ce86c7SWei Liu } 118460ce86c7SWei Liu 118560ce86c7SWei Liu return mode; 118660ce86c7SWei Liu } 118760ce86c7SWei Liu 11886069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 11896069537fSJan Dakinevich const char *basename, 119060ce86c7SWei Liu const struct stat *stbuf, 119160ce86c7SWei Liu V9fsStat *v9stat) 119260ce86c7SWei Liu { 119360ce86c7SWei Liu int err; 119460ce86c7SWei Liu 119560ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 119660ce86c7SWei Liu 11973b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 11983b5ee9e8SAntonios Motakis if (err < 0) { 11993b5ee9e8SAntonios Motakis return err; 12003b5ee9e8SAntonios Motakis } 120160ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 120260ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 120360ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 120460ce86c7SWei Liu v9stat->length = stbuf->st_size; 120560ce86c7SWei Liu 1206abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1207abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1208abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 120960ce86c7SWei Liu 121060ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 121160ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 121260ce86c7SWei Liu v9stat->n_muid = 0; 121360ce86c7SWei Liu 1214abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 121560ce86c7SWei Liu 121660ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12176069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 121860ce86c7SWei Liu if (err < 0) { 121960ce86c7SWei Liu return err; 122060ce86c7SWei Liu } 122160ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 122260ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 122360ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 122460ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 122560ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 122660ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 122760ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 122860ce86c7SWei Liu } 122960ce86c7SWei Liu 12306069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 123160ce86c7SWei Liu 123260ce86c7SWei Liu v9stat->size = 61 + 123360ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 123460ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 123560ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 123660ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 123760ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 123860ce86c7SWei Liu return 0; 123960ce86c7SWei Liu } 124060ce86c7SWei Liu 124160ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 124260ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 124360ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 124460ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 124560ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 124660ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 124760ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 124860ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 124960ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 125060ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 125160ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 125260ce86c7SWei Liu 125360ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 125460ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 125560ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 125660ce86c7SWei Liu 125760ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 125860ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 125960ce86c7SWei Liu 126060ce86c7SWei Liu 12613b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 126260ce86c7SWei Liu V9fsStatDotl *v9lstat) 126360ce86c7SWei Liu { 126460ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 126560ce86c7SWei Liu 126660ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 126760ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 126860ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 126960ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 127060ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 127160ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 127260ce86c7SWei Liu v9lstat->st_blksize = stbuf->st_blksize; 127360ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 127460ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 127560ce86c7SWei Liu v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 127660ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 127760ce86c7SWei Liu v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 127860ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 127960ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 128060ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 128160ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 128260ce86c7SWei Liu 12833b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 128460ce86c7SWei Liu } 128560ce86c7SWei Liu 128660ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 128760ce86c7SWei Liu { 128860ce86c7SWei Liu int i; 128960ce86c7SWei Liu 129060ce86c7SWei Liu printf("sg[%d]: {", cnt); 129160ce86c7SWei Liu for (i = 0; i < cnt; i++) { 129260ce86c7SWei Liu if (i) { 129360ce86c7SWei Liu printf(", "); 129460ce86c7SWei Liu } 129560ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 129660ce86c7SWei Liu } 129760ce86c7SWei Liu printf("}\n"); 129860ce86c7SWei Liu } 129960ce86c7SWei Liu 130060ce86c7SWei Liu /* Will call this only for path name based fid */ 130160ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 130260ce86c7SWei Liu { 130360ce86c7SWei Liu V9fsPath str; 130460ce86c7SWei Liu v9fs_path_init(&str); 130560ce86c7SWei Liu v9fs_path_copy(&str, dst); 1306e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 130760ce86c7SWei Liu v9fs_path_free(&str); 130860ce86c7SWei Liu } 130960ce86c7SWei Liu 131060ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 131160ce86c7SWei Liu { 131260ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 131360ce86c7SWei Liu } 131460ce86c7SWei Liu 13158440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 131660ce86c7SWei Liu { 131760ce86c7SWei Liu ssize_t err; 131860ce86c7SWei Liu V9fsPDU *pdu = opaque; 131960ce86c7SWei Liu V9fsState *s = pdu->s; 132060ce86c7SWei Liu V9fsString version; 132160ce86c7SWei Liu size_t offset = 7; 132260ce86c7SWei Liu 132360ce86c7SWei Liu v9fs_string_init(&version); 132460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 132560ce86c7SWei Liu if (err < 0) { 132660ce86c7SWei Liu goto out; 132760ce86c7SWei Liu } 132860ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 132960ce86c7SWei Liu 133060ce86c7SWei Liu virtfs_reset(pdu); 133160ce86c7SWei Liu 133260ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 133360ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 133460ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 133560ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 133660ce86c7SWei Liu } else { 133760ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1338e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1339e16453a3SChristian Schoenebeck goto marshal; 134060ce86c7SWei Liu } 134160ce86c7SWei Liu 1342e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1343e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1344e16453a3SChristian Schoenebeck error_report( 1345e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1346e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1347e16453a3SChristian Schoenebeck ); 1348e16453a3SChristian Schoenebeck goto out; 1349e16453a3SChristian Schoenebeck } 1350e16453a3SChristian Schoenebeck 135162777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1352c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 135362777d82SChristian Schoenebeck warn_report_once( 135462777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 135562777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 135662777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 135762777d82SChristian Schoenebeck ); 135862777d82SChristian Schoenebeck } 135962777d82SChristian Schoenebeck 1360e16453a3SChristian Schoenebeck marshal: 136160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 136260ce86c7SWei Liu if (err < 0) { 136360ce86c7SWei Liu goto out; 136460ce86c7SWei Liu } 1365403a905bSPhilippe Mathieu-Daudé err += offset; 136660ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 136760ce86c7SWei Liu out: 1368403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 136960ce86c7SWei Liu v9fs_string_free(&version); 137060ce86c7SWei Liu } 137160ce86c7SWei Liu 13728440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 137360ce86c7SWei Liu { 137460ce86c7SWei Liu V9fsPDU *pdu = opaque; 137560ce86c7SWei Liu V9fsState *s = pdu->s; 137660ce86c7SWei Liu int32_t fid, afid, n_uname; 137760ce86c7SWei Liu V9fsString uname, aname; 137860ce86c7SWei Liu V9fsFidState *fidp; 137960ce86c7SWei Liu size_t offset = 7; 138060ce86c7SWei Liu V9fsQID qid; 138160ce86c7SWei Liu ssize_t err; 138260ce86c7SWei Liu 138360ce86c7SWei Liu v9fs_string_init(&uname); 138460ce86c7SWei Liu v9fs_string_init(&aname); 138560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 138660ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 138760ce86c7SWei Liu if (err < 0) { 138860ce86c7SWei Liu goto out_nofid; 138960ce86c7SWei Liu } 139060ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 139160ce86c7SWei Liu 139260ce86c7SWei Liu fidp = alloc_fid(s, fid); 139360ce86c7SWei Liu if (fidp == NULL) { 139460ce86c7SWei Liu err = -EINVAL; 139560ce86c7SWei Liu goto out_nofid; 139660ce86c7SWei Liu } 139760ce86c7SWei Liu fidp->uid = n_uname; 139860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 139960ce86c7SWei Liu if (err < 0) { 140060ce86c7SWei Liu err = -EINVAL; 140160ce86c7SWei Liu clunk_fid(s, fid); 140260ce86c7SWei Liu goto out; 140360ce86c7SWei Liu } 140460ce86c7SWei Liu err = fid_to_qid(pdu, fidp, &qid); 140560ce86c7SWei Liu if (err < 0) { 140660ce86c7SWei Liu err = -EINVAL; 140760ce86c7SWei Liu clunk_fid(s, fid); 140860ce86c7SWei Liu goto out; 140960ce86c7SWei Liu } 1410fe44dc91SAshijeet Acharya 1411fe44dc91SAshijeet Acharya /* 1412fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1413fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1414fe44dc91SAshijeet Acharya */ 1415fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1416fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1417fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1418fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14199261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14209261ef5eSMarkus Armbruster if (err < 0) { 1421fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1422fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1423fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1424fe44dc91SAshijeet Acharya goto out; 1425fe44dc91SAshijeet Acharya } 1426fe44dc91SAshijeet Acharya s->root_fid = fid; 1427fe44dc91SAshijeet Acharya } 1428fe44dc91SAshijeet Acharya 142960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 143060ce86c7SWei Liu if (err < 0) { 143160ce86c7SWei Liu clunk_fid(s, fid); 143260ce86c7SWei Liu goto out; 143360ce86c7SWei Liu } 143460ce86c7SWei Liu err += offset; 1435fe44dc91SAshijeet Acharya 143656f101ecSGreg Kurz memcpy(&s->root_qid, &qid, sizeof(qid)); 143760ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 143860ce86c7SWei Liu qid.type, qid.version, qid.path); 143960ce86c7SWei Liu out: 144060ce86c7SWei Liu put_fid(pdu, fidp); 144160ce86c7SWei Liu out_nofid: 144260ce86c7SWei Liu pdu_complete(pdu, err); 144360ce86c7SWei Liu v9fs_string_free(&uname); 144460ce86c7SWei Liu v9fs_string_free(&aname); 144560ce86c7SWei Liu } 144660ce86c7SWei Liu 14478440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 144860ce86c7SWei Liu { 144960ce86c7SWei Liu int32_t fid; 145060ce86c7SWei Liu V9fsStat v9stat; 145160ce86c7SWei Liu ssize_t err = 0; 145260ce86c7SWei Liu size_t offset = 7; 145360ce86c7SWei Liu struct stat stbuf; 145460ce86c7SWei Liu V9fsFidState *fidp; 145560ce86c7SWei Liu V9fsPDU *pdu = opaque; 14566069537fSJan Dakinevich char *basename; 145760ce86c7SWei Liu 145860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 145960ce86c7SWei Liu if (err < 0) { 146060ce86c7SWei Liu goto out_nofid; 146160ce86c7SWei Liu } 146260ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 146360ce86c7SWei Liu 146460ce86c7SWei Liu fidp = get_fid(pdu, fid); 146560ce86c7SWei Liu if (fidp == NULL) { 146660ce86c7SWei Liu err = -ENOENT; 146760ce86c7SWei Liu goto out_nofid; 146860ce86c7SWei Liu } 146960ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 147060ce86c7SWei Liu if (err < 0) { 147160ce86c7SWei Liu goto out; 147260ce86c7SWei Liu } 14736069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 14746069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 14756069537fSJan Dakinevich g_free(basename); 147660ce86c7SWei Liu if (err < 0) { 147760ce86c7SWei Liu goto out; 147860ce86c7SWei Liu } 147960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 148060ce86c7SWei Liu if (err < 0) { 148160ce86c7SWei Liu v9fs_stat_free(&v9stat); 148260ce86c7SWei Liu goto out; 148360ce86c7SWei Liu } 148460ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 148560ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 148660ce86c7SWei Liu err += offset; 148760ce86c7SWei Liu v9fs_stat_free(&v9stat); 148860ce86c7SWei Liu out: 148960ce86c7SWei Liu put_fid(pdu, fidp); 149060ce86c7SWei Liu out_nofid: 149160ce86c7SWei Liu pdu_complete(pdu, err); 149260ce86c7SWei Liu } 149360ce86c7SWei Liu 14948440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 149560ce86c7SWei Liu { 149660ce86c7SWei Liu int32_t fid; 149760ce86c7SWei Liu size_t offset = 7; 149860ce86c7SWei Liu ssize_t retval = 0; 149960ce86c7SWei Liu struct stat stbuf; 150060ce86c7SWei Liu V9fsFidState *fidp; 150160ce86c7SWei Liu uint64_t request_mask; 150260ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 150360ce86c7SWei Liu V9fsPDU *pdu = opaque; 150460ce86c7SWei Liu 150560ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 150660ce86c7SWei Liu if (retval < 0) { 150760ce86c7SWei Liu goto out_nofid; 150860ce86c7SWei Liu } 150960ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 151060ce86c7SWei Liu 151160ce86c7SWei Liu fidp = get_fid(pdu, fid); 151260ce86c7SWei Liu if (fidp == NULL) { 151360ce86c7SWei Liu retval = -ENOENT; 151460ce86c7SWei Liu goto out_nofid; 151560ce86c7SWei Liu } 151660ce86c7SWei Liu /* 151760ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 151860ce86c7SWei Liu * need to look at request_mask. 151960ce86c7SWei Liu */ 152060ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 152160ce86c7SWei Liu if (retval < 0) { 152260ce86c7SWei Liu goto out; 152360ce86c7SWei Liu } 15243b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15253b5ee9e8SAntonios Motakis if (retval < 0) { 15263b5ee9e8SAntonios Motakis goto out; 15273b5ee9e8SAntonios Motakis } 152860ce86c7SWei Liu 152960ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 153060ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 153160ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 153260ce86c7SWei Liu switch (retval) { 153360ce86c7SWei Liu case 0: 153460ce86c7SWei Liu /* we have valid st_gen: update result mask */ 153560ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 153660ce86c7SWei Liu break; 153760ce86c7SWei Liu case -EINTR: 153860ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 153960ce86c7SWei Liu goto out; 154060ce86c7SWei Liu default: 154160ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 154260ce86c7SWei Liu break; 154360ce86c7SWei Liu } 154460ce86c7SWei Liu } 154560ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 154660ce86c7SWei Liu if (retval < 0) { 154760ce86c7SWei Liu goto out; 154860ce86c7SWei Liu } 154960ce86c7SWei Liu retval += offset; 155060ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 155160ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 155260ce86c7SWei Liu v9stat_dotl.st_gid); 155360ce86c7SWei Liu out: 155460ce86c7SWei Liu put_fid(pdu, fidp); 155560ce86c7SWei Liu out_nofid: 155660ce86c7SWei Liu pdu_complete(pdu, retval); 155760ce86c7SWei Liu } 155860ce86c7SWei Liu 155960ce86c7SWei Liu /* Attribute flags */ 156060ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 156160ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 156260ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 156360ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 156460ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 156560ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 156660ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 156760ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 156860ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 156960ce86c7SWei Liu 157060ce86c7SWei Liu #define P9_ATTR_MASK 127 157160ce86c7SWei Liu 15728440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 157360ce86c7SWei Liu { 157460ce86c7SWei Liu int err = 0; 157560ce86c7SWei Liu int32_t fid; 157660ce86c7SWei Liu V9fsFidState *fidp; 157760ce86c7SWei Liu size_t offset = 7; 157860ce86c7SWei Liu V9fsIattr v9iattr; 157960ce86c7SWei Liu V9fsPDU *pdu = opaque; 158060ce86c7SWei Liu 158160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 158260ce86c7SWei Liu if (err < 0) { 158360ce86c7SWei Liu goto out_nofid; 158460ce86c7SWei Liu } 158560ce86c7SWei Liu 15868f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 15878f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 15888f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 15898f9c64bfSGreg Kurz 159060ce86c7SWei Liu fidp = get_fid(pdu, fid); 159160ce86c7SWei Liu if (fidp == NULL) { 159260ce86c7SWei Liu err = -EINVAL; 159360ce86c7SWei Liu goto out_nofid; 159460ce86c7SWei Liu } 159560ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 159660ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 159760ce86c7SWei Liu if (err < 0) { 159860ce86c7SWei Liu goto out; 159960ce86c7SWei Liu } 160060ce86c7SWei Liu } 160160ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 160260ce86c7SWei Liu struct timespec times[2]; 160360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 160460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 160560ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 160660ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 160760ce86c7SWei Liu } else { 160860ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 160960ce86c7SWei Liu } 161060ce86c7SWei Liu } else { 161160ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 161260ce86c7SWei Liu } 161360ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 161460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 161560ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 161660ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 161760ce86c7SWei Liu } else { 161860ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 161960ce86c7SWei Liu } 162060ce86c7SWei Liu } else { 162160ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 162260ce86c7SWei Liu } 162360ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 162460ce86c7SWei Liu if (err < 0) { 162560ce86c7SWei Liu goto out; 162660ce86c7SWei Liu } 162760ce86c7SWei Liu } 162860ce86c7SWei Liu /* 162960ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 163060ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 163160ce86c7SWei Liu */ 163260ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 163360ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 163460ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 163560ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 163660ce86c7SWei Liu v9iattr.uid = -1; 163760ce86c7SWei Liu } 163860ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 163960ce86c7SWei Liu v9iattr.gid = -1; 164060ce86c7SWei Liu } 164160ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 164260ce86c7SWei Liu v9iattr.gid); 164360ce86c7SWei Liu if (err < 0) { 164460ce86c7SWei Liu goto out; 164560ce86c7SWei Liu } 164660ce86c7SWei Liu } 164760ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 164860ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 164960ce86c7SWei Liu if (err < 0) { 165060ce86c7SWei Liu goto out; 165160ce86c7SWei Liu } 165260ce86c7SWei Liu } 165360ce86c7SWei Liu err = offset; 16548f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 165560ce86c7SWei Liu out: 165660ce86c7SWei Liu put_fid(pdu, fidp); 165760ce86c7SWei Liu out_nofid: 165860ce86c7SWei Liu pdu_complete(pdu, err); 165960ce86c7SWei Liu } 166060ce86c7SWei Liu 166160ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 166260ce86c7SWei Liu { 166360ce86c7SWei Liu int i; 166460ce86c7SWei Liu ssize_t err; 166560ce86c7SWei Liu size_t offset = 7; 166660ce86c7SWei Liu 166760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 166860ce86c7SWei Liu if (err < 0) { 166960ce86c7SWei Liu return err; 167060ce86c7SWei Liu } 167160ce86c7SWei Liu offset += err; 167260ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 167360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 167460ce86c7SWei Liu if (err < 0) { 167560ce86c7SWei Liu return err; 167660ce86c7SWei Liu } 167760ce86c7SWei Liu offset += err; 167860ce86c7SWei Liu } 167960ce86c7SWei Liu return offset; 168060ce86c7SWei Liu } 168160ce86c7SWei Liu 1682fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1683fff39a7aSGreg Kurz { 1684fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1685fff39a7aSGreg Kurz } 1686fff39a7aSGreg Kurz 168756f101ecSGreg Kurz static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) 168856f101ecSGreg Kurz { 168956f101ecSGreg Kurz return 169056f101ecSGreg Kurz qid1->type != qid2->type || 169156f101ecSGreg Kurz qid1->version != qid2->version || 169256f101ecSGreg Kurz qid1->path != qid2->path; 169356f101ecSGreg Kurz } 169456f101ecSGreg Kurz 16958440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 169660ce86c7SWei Liu { 169760ce86c7SWei Liu int name_idx; 169860ce86c7SWei Liu V9fsQID *qids = NULL; 169960ce86c7SWei Liu int i, err = 0; 170060ce86c7SWei Liu V9fsPath dpath, path; 170160ce86c7SWei Liu uint16_t nwnames; 170260ce86c7SWei Liu struct stat stbuf; 170360ce86c7SWei Liu size_t offset = 7; 170460ce86c7SWei Liu int32_t fid, newfid; 170560ce86c7SWei Liu V9fsString *wnames = NULL; 170660ce86c7SWei Liu V9fsFidState *fidp; 170760ce86c7SWei Liu V9fsFidState *newfidp = NULL; 170860ce86c7SWei Liu V9fsPDU *pdu = opaque; 170960ce86c7SWei Liu V9fsState *s = pdu->s; 171056f101ecSGreg Kurz V9fsQID qid; 171160ce86c7SWei Liu 171260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 171360ce86c7SWei Liu if (err < 0) { 171460ce86c7SWei Liu pdu_complete(pdu, err); 171560ce86c7SWei Liu return ; 171660ce86c7SWei Liu } 171760ce86c7SWei Liu offset += err; 171860ce86c7SWei Liu 171960ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 172060ce86c7SWei Liu 172160ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 17221923923bSGreg Kurz wnames = g_new0(V9fsString, nwnames); 17231923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 172460ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 172560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 172660ce86c7SWei Liu if (err < 0) { 172760ce86c7SWei Liu goto out_nofid; 172860ce86c7SWei Liu } 1729fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1730fff39a7aSGreg Kurz err = -ENOENT; 1731fff39a7aSGreg Kurz goto out_nofid; 1732fff39a7aSGreg Kurz } 173360ce86c7SWei Liu offset += err; 173460ce86c7SWei Liu } 173560ce86c7SWei Liu } else if (nwnames > P9_MAXWELEM) { 173660ce86c7SWei Liu err = -EINVAL; 173760ce86c7SWei Liu goto out_nofid; 173860ce86c7SWei Liu } 173960ce86c7SWei Liu fidp = get_fid(pdu, fid); 174060ce86c7SWei Liu if (fidp == NULL) { 174160ce86c7SWei Liu err = -ENOENT; 174260ce86c7SWei Liu goto out_nofid; 174360ce86c7SWei Liu } 174456f101ecSGreg Kurz 174513fd08e6SGreg Kurz v9fs_path_init(&dpath); 174613fd08e6SGreg Kurz v9fs_path_init(&path); 174713fd08e6SGreg Kurz 174856f101ecSGreg Kurz err = fid_to_qid(pdu, fidp, &qid); 174956f101ecSGreg Kurz if (err < 0) { 175056f101ecSGreg Kurz goto out; 175156f101ecSGreg Kurz } 175256f101ecSGreg Kurz 175360ce86c7SWei Liu /* 175460ce86c7SWei Liu * Both dpath and path initially poin to fidp. 175560ce86c7SWei Liu * Needed to handle request with nwnames == 0 175660ce86c7SWei Liu */ 175760ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 175860ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 175960ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 176056f101ecSGreg Kurz if (not_same_qid(&pdu->s->root_qid, &qid) || 176156f101ecSGreg Kurz strcmp("..", wnames[name_idx].data)) { 176256f101ecSGreg Kurz err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, 176356f101ecSGreg Kurz &path); 176460ce86c7SWei Liu if (err < 0) { 176560ce86c7SWei Liu goto out; 176660ce86c7SWei Liu } 176756f101ecSGreg Kurz 176860ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 176960ce86c7SWei Liu if (err < 0) { 177060ce86c7SWei Liu goto out; 177160ce86c7SWei Liu } 17723b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 17733b5ee9e8SAntonios Motakis if (err < 0) { 17743b5ee9e8SAntonios Motakis goto out; 17753b5ee9e8SAntonios Motakis } 177660ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 177760ce86c7SWei Liu } 177856f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 177956f101ecSGreg Kurz } 178060ce86c7SWei Liu if (fid == newfid) { 178149dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 178249dd946bSGreg Kurz err = -EINVAL; 178349dd946bSGreg Kurz goto out; 178449dd946bSGreg Kurz } 17855b3c77aaSGreg Kurz v9fs_path_write_lock(s); 178660ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 17875b3c77aaSGreg Kurz v9fs_path_unlock(s); 178860ce86c7SWei Liu } else { 178960ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 179060ce86c7SWei Liu if (newfidp == NULL) { 179160ce86c7SWei Liu err = -EINVAL; 179260ce86c7SWei Liu goto out; 179360ce86c7SWei Liu } 179460ce86c7SWei Liu newfidp->uid = fidp->uid; 179560ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 179660ce86c7SWei Liu } 179760ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 179860ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 179960ce86c7SWei Liu out: 180060ce86c7SWei Liu put_fid(pdu, fidp); 180160ce86c7SWei Liu if (newfidp) { 180260ce86c7SWei Liu put_fid(pdu, newfidp); 180360ce86c7SWei Liu } 180460ce86c7SWei Liu v9fs_path_free(&dpath); 180560ce86c7SWei Liu v9fs_path_free(&path); 180660ce86c7SWei Liu out_nofid: 180760ce86c7SWei Liu pdu_complete(pdu, err); 180860ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 180960ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 181060ce86c7SWei Liu v9fs_string_free(&wnames[name_idx]); 181160ce86c7SWei Liu } 181260ce86c7SWei Liu g_free(wnames); 181360ce86c7SWei Liu g_free(qids); 181460ce86c7SWei Liu } 181560ce86c7SWei Liu } 181660ce86c7SWei Liu 18178440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 181860ce86c7SWei Liu { 181960ce86c7SWei Liu struct statfs stbuf; 182060ce86c7SWei Liu int32_t iounit = 0; 182160ce86c7SWei Liu V9fsState *s = pdu->s; 182260ce86c7SWei Liu 182360ce86c7SWei Liu /* 182460ce86c7SWei Liu * iounit should be multiples of f_bsize (host filesystem block size 182560ce86c7SWei Liu * and as well as less than (client msize - P9_IOHDRSZ)) 182660ce86c7SWei Liu */ 182760ce86c7SWei Liu if (!v9fs_co_statfs(pdu, path, &stbuf)) { 182868d654daSDan Schatzberg if (stbuf.f_bsize) { 182960ce86c7SWei Liu iounit = stbuf.f_bsize; 183060ce86c7SWei Liu iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; 183160ce86c7SWei Liu } 183268d654daSDan Schatzberg } 183360ce86c7SWei Liu if (!iounit) { 183460ce86c7SWei Liu iounit = s->msize - P9_IOHDRSZ; 183560ce86c7SWei Liu } 183660ce86c7SWei Liu return iounit; 183760ce86c7SWei Liu } 183860ce86c7SWei Liu 18398440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 184060ce86c7SWei Liu { 184160ce86c7SWei Liu int flags; 184260ce86c7SWei Liu int32_t fid; 184360ce86c7SWei Liu int32_t mode; 184460ce86c7SWei Liu V9fsQID qid; 184560ce86c7SWei Liu int iounit = 0; 184660ce86c7SWei Liu ssize_t err = 0; 184760ce86c7SWei Liu size_t offset = 7; 184860ce86c7SWei Liu struct stat stbuf; 184960ce86c7SWei Liu V9fsFidState *fidp; 185060ce86c7SWei Liu V9fsPDU *pdu = opaque; 185160ce86c7SWei Liu V9fsState *s = pdu->s; 185260ce86c7SWei Liu 185360ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 185460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 185560ce86c7SWei Liu } else { 185660ce86c7SWei Liu uint8_t modebyte; 185760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 185860ce86c7SWei Liu mode = modebyte; 185960ce86c7SWei Liu } 186060ce86c7SWei Liu if (err < 0) { 186160ce86c7SWei Liu goto out_nofid; 186260ce86c7SWei Liu } 186360ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 186460ce86c7SWei Liu 186560ce86c7SWei Liu fidp = get_fid(pdu, fid); 186660ce86c7SWei Liu if (fidp == NULL) { 186760ce86c7SWei Liu err = -ENOENT; 186860ce86c7SWei Liu goto out_nofid; 186960ce86c7SWei Liu } 187049dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 187149dd946bSGreg Kurz err = -EINVAL; 187249dd946bSGreg Kurz goto out; 187349dd946bSGreg Kurz } 187460ce86c7SWei Liu 187560ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 187660ce86c7SWei Liu if (err < 0) { 187760ce86c7SWei Liu goto out; 187860ce86c7SWei Liu } 18793b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18803b5ee9e8SAntonios Motakis if (err < 0) { 18813b5ee9e8SAntonios Motakis goto out; 18823b5ee9e8SAntonios Motakis } 188360ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 188460ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 188560ce86c7SWei Liu if (err < 0) { 188660ce86c7SWei Liu goto out; 188760ce86c7SWei Liu } 188860ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 188960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 189060ce86c7SWei Liu if (err < 0) { 189160ce86c7SWei Liu goto out; 189260ce86c7SWei Liu } 189360ce86c7SWei Liu err += offset; 189460ce86c7SWei Liu } else { 189560ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 189660ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 189760ce86c7SWei Liu } else { 189860ce86c7SWei Liu flags = omode_to_uflags(mode); 189960ce86c7SWei Liu } 190060ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 190160ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 190260ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 190360ce86c7SWei Liu err = -EROFS; 190460ce86c7SWei Liu goto out; 190560ce86c7SWei Liu } 190660ce86c7SWei Liu } 190760ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 190860ce86c7SWei Liu if (err < 0) { 190960ce86c7SWei Liu goto out; 191060ce86c7SWei Liu } 191160ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 191260ce86c7SWei Liu fidp->open_flags = flags; 191360ce86c7SWei Liu if (flags & O_EXCL) { 191460ce86c7SWei Liu /* 191560ce86c7SWei Liu * We let the host file system do O_EXCL check 191660ce86c7SWei Liu * We should not reclaim such fd 191760ce86c7SWei Liu */ 191860ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 191960ce86c7SWei Liu } 192060ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 192160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 192260ce86c7SWei Liu if (err < 0) { 192360ce86c7SWei Liu goto out; 192460ce86c7SWei Liu } 192560ce86c7SWei Liu err += offset; 192660ce86c7SWei Liu } 192760ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 192860ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 192960ce86c7SWei Liu out: 193060ce86c7SWei Liu put_fid(pdu, fidp); 193160ce86c7SWei Liu out_nofid: 193260ce86c7SWei Liu pdu_complete(pdu, err); 193360ce86c7SWei Liu } 193460ce86c7SWei Liu 19358440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 193660ce86c7SWei Liu { 193760ce86c7SWei Liu int32_t dfid, flags, mode; 193860ce86c7SWei Liu gid_t gid; 193960ce86c7SWei Liu ssize_t err = 0; 194060ce86c7SWei Liu ssize_t offset = 7; 194160ce86c7SWei Liu V9fsString name; 194260ce86c7SWei Liu V9fsFidState *fidp; 194360ce86c7SWei Liu struct stat stbuf; 194460ce86c7SWei Liu V9fsQID qid; 194560ce86c7SWei Liu int32_t iounit; 194660ce86c7SWei Liu V9fsPDU *pdu = opaque; 194760ce86c7SWei Liu 194860ce86c7SWei Liu v9fs_string_init(&name); 194960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 195060ce86c7SWei Liu &name, &flags, &mode, &gid); 195160ce86c7SWei Liu if (err < 0) { 195260ce86c7SWei Liu goto out_nofid; 195360ce86c7SWei Liu } 195460ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 195560ce86c7SWei Liu 1956fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 1957fff39a7aSGreg Kurz err = -ENOENT; 1958fff39a7aSGreg Kurz goto out_nofid; 1959fff39a7aSGreg Kurz } 1960fff39a7aSGreg Kurz 1961805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 1962805b5d98SGreg Kurz err = -EEXIST; 1963805b5d98SGreg Kurz goto out_nofid; 1964805b5d98SGreg Kurz } 1965805b5d98SGreg Kurz 196660ce86c7SWei Liu fidp = get_fid(pdu, dfid); 196760ce86c7SWei Liu if (fidp == NULL) { 196860ce86c7SWei Liu err = -ENOENT; 196960ce86c7SWei Liu goto out_nofid; 197060ce86c7SWei Liu } 1971d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 1972d63fb193SLi Qiang err = -EINVAL; 1973d63fb193SLi Qiang goto out; 1974d63fb193SLi Qiang } 197560ce86c7SWei Liu 197660ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 197760ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 197860ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 197960ce86c7SWei Liu if (err < 0) { 198060ce86c7SWei Liu goto out; 198160ce86c7SWei Liu } 198260ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 198360ce86c7SWei Liu fidp->open_flags = flags; 198460ce86c7SWei Liu if (flags & O_EXCL) { 198560ce86c7SWei Liu /* 198660ce86c7SWei Liu * We let the host file system do O_EXCL check 198760ce86c7SWei Liu * We should not reclaim such fd 198860ce86c7SWei Liu */ 198960ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 199060ce86c7SWei Liu } 199160ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 19923b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19933b5ee9e8SAntonios Motakis if (err < 0) { 19943b5ee9e8SAntonios Motakis goto out; 19953b5ee9e8SAntonios Motakis } 199660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 199760ce86c7SWei Liu if (err < 0) { 199860ce86c7SWei Liu goto out; 199960ce86c7SWei Liu } 200060ce86c7SWei Liu err += offset; 200160ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 200260ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 200360ce86c7SWei Liu out: 200460ce86c7SWei Liu put_fid(pdu, fidp); 200560ce86c7SWei Liu out_nofid: 200660ce86c7SWei Liu pdu_complete(pdu, err); 200760ce86c7SWei Liu v9fs_string_free(&name); 200860ce86c7SWei Liu } 200960ce86c7SWei Liu 2010a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 201160ce86c7SWei Liu { 201260ce86c7SWei Liu int err; 201360ce86c7SWei Liu int32_t fid; 201460ce86c7SWei Liu int datasync; 201560ce86c7SWei Liu size_t offset = 7; 201660ce86c7SWei Liu V9fsFidState *fidp; 201760ce86c7SWei Liu V9fsPDU *pdu = opaque; 201860ce86c7SWei Liu 201960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 202060ce86c7SWei Liu if (err < 0) { 202160ce86c7SWei Liu goto out_nofid; 202260ce86c7SWei Liu } 202360ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 202460ce86c7SWei Liu 202560ce86c7SWei Liu fidp = get_fid(pdu, fid); 202660ce86c7SWei Liu if (fidp == NULL) { 202760ce86c7SWei Liu err = -ENOENT; 202860ce86c7SWei Liu goto out_nofid; 202960ce86c7SWei Liu } 203060ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 203160ce86c7SWei Liu if (!err) { 203260ce86c7SWei Liu err = offset; 203360ce86c7SWei Liu } 203460ce86c7SWei Liu put_fid(pdu, fidp); 203560ce86c7SWei Liu out_nofid: 203660ce86c7SWei Liu pdu_complete(pdu, err); 203760ce86c7SWei Liu } 203860ce86c7SWei Liu 20398440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 204060ce86c7SWei Liu { 204160ce86c7SWei Liu int err; 204260ce86c7SWei Liu int32_t fid; 204360ce86c7SWei Liu size_t offset = 7; 204460ce86c7SWei Liu V9fsFidState *fidp; 204560ce86c7SWei Liu V9fsPDU *pdu = opaque; 204660ce86c7SWei Liu V9fsState *s = pdu->s; 204760ce86c7SWei Liu 204860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 204960ce86c7SWei Liu if (err < 0) { 205060ce86c7SWei Liu goto out_nofid; 205160ce86c7SWei Liu } 205260ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 205360ce86c7SWei Liu 205460ce86c7SWei Liu fidp = clunk_fid(s, fid); 205560ce86c7SWei Liu if (fidp == NULL) { 205660ce86c7SWei Liu err = -ENOENT; 205760ce86c7SWei Liu goto out_nofid; 205860ce86c7SWei Liu } 205960ce86c7SWei Liu /* 206060ce86c7SWei Liu * Bump the ref so that put_fid will 206160ce86c7SWei Liu * free the fid. 206260ce86c7SWei Liu */ 206360ce86c7SWei Liu fidp->ref++; 206460ce86c7SWei Liu err = put_fid(pdu, fidp); 206560ce86c7SWei Liu if (!err) { 206660ce86c7SWei Liu err = offset; 206760ce86c7SWei Liu } 206860ce86c7SWei Liu out_nofid: 206960ce86c7SWei Liu pdu_complete(pdu, err); 207060ce86c7SWei Liu } 207160ce86c7SWei Liu 2072bcb8998fSStefano Stabellini /* 2073bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2074bcb8998fSStefano Stabellini * 2075bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2076bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2077bcb8998fSStefano Stabellini * @size: number of bytes to include 2078bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2079bcb8998fSStefano Stabellini * 2080bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2081bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2082bcb8998fSStefano Stabellini */ 2083bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2084cf45183bSStefano Stabellini size_t skip, size_t size, 2085bcb8998fSStefano Stabellini bool is_write) 2086bcb8998fSStefano Stabellini { 2087bcb8998fSStefano Stabellini QEMUIOVector elem; 2088bcb8998fSStefano Stabellini struct iovec *iov; 2089bcb8998fSStefano Stabellini unsigned int niov; 2090bcb8998fSStefano Stabellini 209188da0b03SStefano Stabellini if (is_write) { 2092cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 209388da0b03SStefano Stabellini } else { 2094cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 209588da0b03SStefano Stabellini } 2096bcb8998fSStefano Stabellini 2097bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2098bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2099cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2100bcb8998fSStefano Stabellini } 2101bcb8998fSStefano Stabellini 210260ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 210360ce86c7SWei Liu uint64_t off, uint32_t max_count) 210460ce86c7SWei Liu { 210560ce86c7SWei Liu ssize_t err; 210660ce86c7SWei Liu size_t offset = 7; 2107cf45183bSStefano Stabellini uint64_t read_count; 2108bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 210960ce86c7SWei Liu 21107e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21117e55d65cSLi Qiang read_count = 0; 211216724a17SGreg Kurz } else { 2113cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2114cf45183bSStefano Stabellini } 2115cf45183bSStefano Stabellini if (read_count > max_count) { 211660ce86c7SWei Liu read_count = max_count; 211760ce86c7SWei Liu } 211860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 211960ce86c7SWei Liu if (err < 0) { 212060ce86c7SWei Liu return err; 212160ce86c7SWei Liu } 212260ce86c7SWei Liu offset += err; 212300588a0aSWei Liu 2124cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2125fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 212660ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 212760ce86c7SWei Liu read_count); 2128bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 212960ce86c7SWei Liu if (err < 0) { 213060ce86c7SWei Liu return err; 213160ce86c7SWei Liu } 213260ce86c7SWei Liu offset += err; 213360ce86c7SWei Liu return offset; 213460ce86c7SWei Liu } 213560ce86c7SWei Liu 21368440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 21378440e22eSGreg Kurz V9fsFidState *fidp, 21388440e22eSGreg Kurz uint32_t max_count) 213960ce86c7SWei Liu { 214060ce86c7SWei Liu V9fsPath path; 214160ce86c7SWei Liu V9fsStat v9stat; 214260ce86c7SWei Liu int len, err = 0; 214360ce86c7SWei Liu int32_t count = 0; 214460ce86c7SWei Liu struct stat stbuf; 214560ce86c7SWei Liu off_t saved_dir_pos; 2146635324e8SGreg Kurz struct dirent *dent; 214760ce86c7SWei Liu 214860ce86c7SWei Liu /* save the directory position */ 214960ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 215060ce86c7SWei Liu if (saved_dir_pos < 0) { 215160ce86c7SWei Liu return saved_dir_pos; 215260ce86c7SWei Liu } 215360ce86c7SWei Liu 215460ce86c7SWei Liu while (1) { 215560ce86c7SWei Liu v9fs_path_init(&path); 21567cde47d4SGreg Kurz 21577cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 21587cde47d4SGreg Kurz 2159635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2160635324e8SGreg Kurz if (err || !dent) { 216160ce86c7SWei Liu break; 216260ce86c7SWei Liu } 216360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 216460ce86c7SWei Liu if (err < 0) { 21658762a46dSGreg Kurz break; 216660ce86c7SWei Liu } 216760ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 216860ce86c7SWei Liu if (err < 0) { 21698762a46dSGreg Kurz break; 217060ce86c7SWei Liu } 21716069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 217260ce86c7SWei Liu if (err < 0) { 21738762a46dSGreg Kurz break; 217460ce86c7SWei Liu } 2175772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 21767cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 21777cde47d4SGreg Kurz 217860ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 217960ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 218060ce86c7SWei Liu v9fs_stat_free(&v9stat); 218160ce86c7SWei Liu v9fs_path_free(&path); 218260ce86c7SWei Liu return count; 218360ce86c7SWei Liu } 2184772a7369SJan Dakinevich 2185772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2186772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2187772a7369SJan Dakinevich 2188772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2189772a7369SJan Dakinevich 2190772a7369SJan Dakinevich if (len < 0) { 2191772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2192772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2193772a7369SJan Dakinevich v9fs_path_free(&path); 2194772a7369SJan Dakinevich return len; 2195772a7369SJan Dakinevich } 219660ce86c7SWei Liu count += len; 219760ce86c7SWei Liu v9fs_stat_free(&v9stat); 219860ce86c7SWei Liu v9fs_path_free(&path); 219960ce86c7SWei Liu saved_dir_pos = dent->d_off; 220060ce86c7SWei Liu } 22018762a46dSGreg Kurz 22027cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22037cde47d4SGreg Kurz 220460ce86c7SWei Liu v9fs_path_free(&path); 220560ce86c7SWei Liu if (err < 0) { 220660ce86c7SWei Liu return err; 220760ce86c7SWei Liu } 220860ce86c7SWei Liu return count; 220960ce86c7SWei Liu } 221060ce86c7SWei Liu 22118440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 221260ce86c7SWei Liu { 221360ce86c7SWei Liu int32_t fid; 221460ce86c7SWei Liu uint64_t off; 221560ce86c7SWei Liu ssize_t err = 0; 221660ce86c7SWei Liu int32_t count = 0; 221760ce86c7SWei Liu size_t offset = 7; 221860ce86c7SWei Liu uint32_t max_count; 221960ce86c7SWei Liu V9fsFidState *fidp; 222060ce86c7SWei Liu V9fsPDU *pdu = opaque; 222160ce86c7SWei Liu V9fsState *s = pdu->s; 222260ce86c7SWei Liu 222360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 222460ce86c7SWei Liu if (err < 0) { 222560ce86c7SWei Liu goto out_nofid; 222660ce86c7SWei Liu } 222760ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 222860ce86c7SWei Liu 222960ce86c7SWei Liu fidp = get_fid(pdu, fid); 223060ce86c7SWei Liu if (fidp == NULL) { 223160ce86c7SWei Liu err = -EINVAL; 223260ce86c7SWei Liu goto out_nofid; 223360ce86c7SWei Liu } 223460ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2235d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2236d2c5cf7cSChristian Schoenebeck warn_report_once( 2237d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2238d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2239d2c5cf7cSChristian Schoenebeck ); 2240d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2241d2c5cf7cSChristian Schoenebeck goto out; 2242d2c5cf7cSChristian Schoenebeck } 224360ce86c7SWei Liu if (off == 0) { 224460ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 224560ce86c7SWei Liu } 224660ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 224760ce86c7SWei Liu if (count < 0) { 224860ce86c7SWei Liu err = count; 224960ce86c7SWei Liu goto out; 225060ce86c7SWei Liu } 225160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 225260ce86c7SWei Liu if (err < 0) { 225360ce86c7SWei Liu goto out; 225460ce86c7SWei Liu } 225560ce86c7SWei Liu err += offset + count; 225660ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 225760ce86c7SWei Liu QEMUIOVector qiov_full; 225860ce86c7SWei Liu QEMUIOVector qiov; 225960ce86c7SWei Liu int32_t len; 226060ce86c7SWei Liu 2261cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 226260ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 226360ce86c7SWei Liu do { 226460ce86c7SWei Liu qemu_iovec_reset(&qiov); 226560ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 226660ce86c7SWei Liu if (0) { 226760ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 226860ce86c7SWei Liu } 226960ce86c7SWei Liu /* Loop in case of EINTR */ 227060ce86c7SWei Liu do { 227160ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 227260ce86c7SWei Liu if (len >= 0) { 227360ce86c7SWei Liu off += len; 227460ce86c7SWei Liu count += len; 227560ce86c7SWei Liu } 227660ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 227760ce86c7SWei Liu if (len < 0) { 227860ce86c7SWei Liu /* IO error return the error */ 227960ce86c7SWei Liu err = len; 2280e95c9a49SLi Qiang goto out_free_iovec; 228160ce86c7SWei Liu } 228260ce86c7SWei Liu } while (count < max_count && len > 0); 228360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 228460ce86c7SWei Liu if (err < 0) { 2285e95c9a49SLi Qiang goto out_free_iovec; 228660ce86c7SWei Liu } 228760ce86c7SWei Liu err += offset + count; 2288e95c9a49SLi Qiang out_free_iovec: 228960ce86c7SWei Liu qemu_iovec_destroy(&qiov); 229060ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 229160ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 229260ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 229360ce86c7SWei Liu } else { 229460ce86c7SWei Liu err = -EINVAL; 229560ce86c7SWei Liu } 229660ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 229760ce86c7SWei Liu out: 229860ce86c7SWei Liu put_fid(pdu, fidp); 229960ce86c7SWei Liu out_nofid: 230060ce86c7SWei Liu pdu_complete(pdu, err); 230160ce86c7SWei Liu } 230260ce86c7SWei Liu 230329c9d2caSChristian Schoenebeck /** 230429c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 230529c9d2caSChristian Schoenebeck * 230629c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 230729c9d2caSChristian Schoenebeck * @returns required size in bytes 230829c9d2caSChristian Schoenebeck */ 230929c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 231060ce86c7SWei Liu { 231160ce86c7SWei Liu /* 231260ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 231360ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 231460ce86c7SWei Liu */ 231560ce86c7SWei Liu return 24 + v9fs_string_size(name); 231660ce86c7SWei Liu } 231760ce86c7SWei Liu 23180c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 23190c4356baSChristian Schoenebeck { 23200c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 23210c4356baSChristian Schoenebeck 23220c4356baSChristian Schoenebeck for (; e; e = next) { 23230c4356baSChristian Schoenebeck next = e->next; 23240c4356baSChristian Schoenebeck g_free(e->dent); 23250c4356baSChristian Schoenebeck g_free(e->st); 23260c4356baSChristian Schoenebeck g_free(e); 23270c4356baSChristian Schoenebeck } 23280c4356baSChristian Schoenebeck } 23290c4356baSChristian Schoenebeck 23308440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 23310c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 233260ce86c7SWei Liu { 233360ce86c7SWei Liu size_t size; 233460ce86c7SWei Liu V9fsQID qid; 233560ce86c7SWei Liu V9fsString name; 233660ce86c7SWei Liu int len, err = 0; 233760ce86c7SWei Liu int32_t count = 0; 2338635324e8SGreg Kurz struct dirent *dent; 23390c4356baSChristian Schoenebeck struct stat *st; 23400c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 234160ce86c7SWei Liu 23420c4356baSChristian Schoenebeck /* 23430c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 23440c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 23450c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 23460c4356baSChristian Schoenebeck */ 23470c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 23480c4356baSChristian Schoenebeck 23490c4356baSChristian Schoenebeck /* 23500c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 23510c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 23520c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 23530c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 23540c4356baSChristian Schoenebeck */ 23550c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 23560c4356baSChristian Schoenebeck dostat); 23570c4356baSChristian Schoenebeck if (count < 0) { 23580c4356baSChristian Schoenebeck err = count; 23590c4356baSChristian Schoenebeck count = 0; 23600c4356baSChristian Schoenebeck goto out; 236160ce86c7SWei Liu } 23620c4356baSChristian Schoenebeck count = 0; 236360ce86c7SWei Liu 23640c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 23650c4356baSChristian Schoenebeck dent = e->dent; 23661a6ed33cSAntonios Motakis 23671a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 23680c4356baSChristian Schoenebeck st = e->st; 23690c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 23700c4356baSChristian Schoenebeck if (!st) { 23710c4356baSChristian Schoenebeck err = -1; 23720c4356baSChristian Schoenebeck break; 23730c4356baSChristian Schoenebeck } 23740c4356baSChristian Schoenebeck 23750c4356baSChristian Schoenebeck /* remap inode */ 23760c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 23771a6ed33cSAntonios Motakis if (err < 0) { 23780c4356baSChristian Schoenebeck break; 23791a6ed33cSAntonios Motakis } 23801a6ed33cSAntonios Motakis } else { 238160ce86c7SWei Liu /* 238260ce86c7SWei Liu * Fill up just the path field of qid because the client uses 238360ce86c7SWei Liu * only that. To fill the entire qid structure we will have 23841a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 23850c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 23861a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 23871a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 23881a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 23891a6ed33cSAntonios Motakis * files/dirs through other ways. 239060ce86c7SWei Liu */ 239160ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 239260ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 239360ce86c7SWei Liu /* Fill the other fields with dummy values */ 239460ce86c7SWei Liu qid.type = 0; 239560ce86c7SWei Liu qid.version = 0; 23961a6ed33cSAntonios Motakis } 239760ce86c7SWei Liu 23980c4356baSChristian Schoenebeck v9fs_string_init(&name); 23990c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24000c4356baSChristian Schoenebeck 240160ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 240260ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 240360ce86c7SWei Liu &qid, dent->d_off, 240460ce86c7SWei Liu dent->d_type, &name); 24057cde47d4SGreg Kurz 24060c4356baSChristian Schoenebeck v9fs_string_free(&name); 24077cde47d4SGreg Kurz 240860ce86c7SWei Liu if (len < 0) { 24090c4356baSChristian Schoenebeck err = len; 24100c4356baSChristian Schoenebeck break; 241160ce86c7SWei Liu } 24120c4356baSChristian Schoenebeck 241360ce86c7SWei Liu count += len; 241460ce86c7SWei Liu } 24157cde47d4SGreg Kurz 24160c4356baSChristian Schoenebeck out: 24170c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 241860ce86c7SWei Liu if (err < 0) { 241960ce86c7SWei Liu return err; 242060ce86c7SWei Liu } 242160ce86c7SWei Liu return count; 242260ce86c7SWei Liu } 242360ce86c7SWei Liu 24248440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 242560ce86c7SWei Liu { 242660ce86c7SWei Liu int32_t fid; 242760ce86c7SWei Liu V9fsFidState *fidp; 242860ce86c7SWei Liu ssize_t retval = 0; 242960ce86c7SWei Liu size_t offset = 7; 243060ce86c7SWei Liu uint64_t initial_offset; 243160ce86c7SWei Liu int32_t count; 243260ce86c7SWei Liu uint32_t max_count; 243360ce86c7SWei Liu V9fsPDU *pdu = opaque; 2434d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 243560ce86c7SWei Liu 243660ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 243760ce86c7SWei Liu &initial_offset, &max_count); 243860ce86c7SWei Liu if (retval < 0) { 243960ce86c7SWei Liu goto out_nofid; 244060ce86c7SWei Liu } 244160ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 244260ce86c7SWei Liu 2443d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2444d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2445d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2446d36a5c22SChristian Schoenebeck warn_report_once( 2447d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2448d36a5c22SChristian Schoenebeck ); 2449d36a5c22SChristian Schoenebeck } 2450d36a5c22SChristian Schoenebeck 245160ce86c7SWei Liu fidp = get_fid(pdu, fid); 245260ce86c7SWei Liu if (fidp == NULL) { 245360ce86c7SWei Liu retval = -EINVAL; 245460ce86c7SWei Liu goto out_nofid; 245560ce86c7SWei Liu } 2456f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 245760ce86c7SWei Liu retval = -EINVAL; 245860ce86c7SWei Liu goto out; 245960ce86c7SWei Liu } 2460d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2461d2c5cf7cSChristian Schoenebeck warn_report_once( 2462d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2463d2c5cf7cSChristian Schoenebeck "protocol version" 2464d2c5cf7cSChristian Schoenebeck ); 2465d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2466d2c5cf7cSChristian Schoenebeck goto out; 2467d2c5cf7cSChristian Schoenebeck } 24680c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 246960ce86c7SWei Liu if (count < 0) { 247060ce86c7SWei Liu retval = count; 247160ce86c7SWei Liu goto out; 247260ce86c7SWei Liu } 247360ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 247460ce86c7SWei Liu if (retval < 0) { 247560ce86c7SWei Liu goto out; 247660ce86c7SWei Liu } 247760ce86c7SWei Liu retval += count + offset; 247860ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 247960ce86c7SWei Liu out: 248060ce86c7SWei Liu put_fid(pdu, fidp); 248160ce86c7SWei Liu out_nofid: 248260ce86c7SWei Liu pdu_complete(pdu, retval); 248360ce86c7SWei Liu } 248460ce86c7SWei Liu 248560ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 248660ce86c7SWei Liu uint64_t off, uint32_t count, 248760ce86c7SWei Liu struct iovec *sg, int cnt) 248860ce86c7SWei Liu { 248960ce86c7SWei Liu int i, to_copy; 249060ce86c7SWei Liu ssize_t err = 0; 24917e55d65cSLi Qiang uint64_t write_count; 249260ce86c7SWei Liu size_t offset = 7; 249360ce86c7SWei Liu 249460ce86c7SWei Liu 24957e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2496b858e80aSDaniel Henrique Barboza return -ENOSPC; 249760ce86c7SWei Liu } 24987e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 24997e55d65cSLi Qiang if (write_count > count) { 25007e55d65cSLi Qiang write_count = count; 25017e55d65cSLi Qiang } 250260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 250360ce86c7SWei Liu if (err < 0) { 250460ce86c7SWei Liu return err; 250560ce86c7SWei Liu } 250660ce86c7SWei Liu err += offset; 250760ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 250860ce86c7SWei Liu /* 250960ce86c7SWei Liu * Now copy the content from sg list 251060ce86c7SWei Liu */ 251160ce86c7SWei Liu for (i = 0; i < cnt; i++) { 251260ce86c7SWei Liu if (write_count > sg[i].iov_len) { 251360ce86c7SWei Liu to_copy = sg[i].iov_len; 251460ce86c7SWei Liu } else { 251560ce86c7SWei Liu to_copy = write_count; 251660ce86c7SWei Liu } 251760ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 251860ce86c7SWei Liu /* updating vs->off since we are not using below */ 251960ce86c7SWei Liu off += to_copy; 252060ce86c7SWei Liu write_count -= to_copy; 252160ce86c7SWei Liu } 2522b858e80aSDaniel Henrique Barboza 252360ce86c7SWei Liu return err; 252460ce86c7SWei Liu } 252560ce86c7SWei Liu 25268440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 252760ce86c7SWei Liu { 252860ce86c7SWei Liu ssize_t err; 252960ce86c7SWei Liu int32_t fid; 253060ce86c7SWei Liu uint64_t off; 253160ce86c7SWei Liu uint32_t count; 253260ce86c7SWei Liu int32_t len = 0; 253360ce86c7SWei Liu int32_t total = 0; 253460ce86c7SWei Liu size_t offset = 7; 253560ce86c7SWei Liu V9fsFidState *fidp; 253660ce86c7SWei Liu V9fsPDU *pdu = opaque; 253760ce86c7SWei Liu V9fsState *s = pdu->s; 253860ce86c7SWei Liu QEMUIOVector qiov_full; 253960ce86c7SWei Liu QEMUIOVector qiov; 254060ce86c7SWei Liu 254160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 254260ce86c7SWei Liu if (err < 0) { 254360ce86c7SWei Liu pdu_complete(pdu, err); 254460ce86c7SWei Liu return; 254560ce86c7SWei Liu } 254660ce86c7SWei Liu offset += err; 2547cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 254860ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 254960ce86c7SWei Liu 255060ce86c7SWei Liu fidp = get_fid(pdu, fid); 255160ce86c7SWei Liu if (fidp == NULL) { 255260ce86c7SWei Liu err = -EINVAL; 255360ce86c7SWei Liu goto out_nofid; 255460ce86c7SWei Liu } 255560ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 255660ce86c7SWei Liu if (fidp->fs.fd == -1) { 255760ce86c7SWei Liu err = -EINVAL; 255860ce86c7SWei Liu goto out; 255960ce86c7SWei Liu } 256060ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 256160ce86c7SWei Liu /* 256260ce86c7SWei Liu * setxattr operation 256360ce86c7SWei Liu */ 256460ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 256560ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 256660ce86c7SWei Liu goto out; 256760ce86c7SWei Liu } else { 256860ce86c7SWei Liu err = -EINVAL; 256960ce86c7SWei Liu goto out; 257060ce86c7SWei Liu } 257160ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 257260ce86c7SWei Liu do { 257360ce86c7SWei Liu qemu_iovec_reset(&qiov); 257460ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 257560ce86c7SWei Liu if (0) { 257660ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 257760ce86c7SWei Liu } 257860ce86c7SWei Liu /* Loop in case of EINTR */ 257960ce86c7SWei Liu do { 258060ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 258160ce86c7SWei Liu if (len >= 0) { 258260ce86c7SWei Liu off += len; 258360ce86c7SWei Liu total += len; 258460ce86c7SWei Liu } 258560ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 258660ce86c7SWei Liu if (len < 0) { 258760ce86c7SWei Liu /* IO error return the error */ 258860ce86c7SWei Liu err = len; 258960ce86c7SWei Liu goto out_qiov; 259060ce86c7SWei Liu } 259160ce86c7SWei Liu } while (total < count && len > 0); 259260ce86c7SWei Liu 259360ce86c7SWei Liu offset = 7; 259460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 259560ce86c7SWei Liu if (err < 0) { 2596fdfcc9aeSLi Qiang goto out_qiov; 259760ce86c7SWei Liu } 259860ce86c7SWei Liu err += offset; 259960ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 260060ce86c7SWei Liu out_qiov: 260160ce86c7SWei Liu qemu_iovec_destroy(&qiov); 260260ce86c7SWei Liu out: 260360ce86c7SWei Liu put_fid(pdu, fidp); 260460ce86c7SWei Liu out_nofid: 260560ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 260660ce86c7SWei Liu pdu_complete(pdu, err); 260760ce86c7SWei Liu } 260860ce86c7SWei Liu 26098440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 261060ce86c7SWei Liu { 261160ce86c7SWei Liu int32_t fid; 261260ce86c7SWei Liu int err = 0; 261360ce86c7SWei Liu size_t offset = 7; 261460ce86c7SWei Liu V9fsFidState *fidp; 261560ce86c7SWei Liu V9fsQID qid; 261660ce86c7SWei Liu int32_t perm; 261760ce86c7SWei Liu int8_t mode; 261860ce86c7SWei Liu V9fsPath path; 261960ce86c7SWei Liu struct stat stbuf; 262060ce86c7SWei Liu V9fsString name; 262160ce86c7SWei Liu V9fsString extension; 262260ce86c7SWei Liu int iounit; 262360ce86c7SWei Liu V9fsPDU *pdu = opaque; 26245b3c77aaSGreg Kurz V9fsState *s = pdu->s; 262560ce86c7SWei Liu 262660ce86c7SWei Liu v9fs_path_init(&path); 262760ce86c7SWei Liu v9fs_string_init(&name); 262860ce86c7SWei Liu v9fs_string_init(&extension); 262960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 263060ce86c7SWei Liu &perm, &mode, &extension); 263160ce86c7SWei Liu if (err < 0) { 263260ce86c7SWei Liu goto out_nofid; 263360ce86c7SWei Liu } 263460ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 263560ce86c7SWei Liu 2636fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2637fff39a7aSGreg Kurz err = -ENOENT; 2638fff39a7aSGreg Kurz goto out_nofid; 2639fff39a7aSGreg Kurz } 2640fff39a7aSGreg Kurz 2641805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2642805b5d98SGreg Kurz err = -EEXIST; 2643805b5d98SGreg Kurz goto out_nofid; 2644805b5d98SGreg Kurz } 2645805b5d98SGreg Kurz 264660ce86c7SWei Liu fidp = get_fid(pdu, fid); 264760ce86c7SWei Liu if (fidp == NULL) { 264860ce86c7SWei Liu err = -EINVAL; 264960ce86c7SWei Liu goto out_nofid; 265060ce86c7SWei Liu } 2651d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2652d63fb193SLi Qiang err = -EINVAL; 2653d63fb193SLi Qiang goto out; 2654d63fb193SLi Qiang } 265560ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 265660ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 265760ce86c7SWei Liu fidp->uid, -1, &stbuf); 265860ce86c7SWei Liu if (err < 0) { 265960ce86c7SWei Liu goto out; 266060ce86c7SWei Liu } 266160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 266260ce86c7SWei Liu if (err < 0) { 266360ce86c7SWei Liu goto out; 266460ce86c7SWei Liu } 26655b3c77aaSGreg Kurz v9fs_path_write_lock(s); 266660ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26675b3c77aaSGreg Kurz v9fs_path_unlock(s); 266860ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 266960ce86c7SWei Liu if (err < 0) { 267060ce86c7SWei Liu goto out; 267160ce86c7SWei Liu } 267260ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 267360ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 267460ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 267560ce86c7SWei Liu extension.data, -1 , &stbuf); 267660ce86c7SWei Liu if (err < 0) { 267760ce86c7SWei Liu goto out; 267860ce86c7SWei Liu } 267960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 268060ce86c7SWei Liu if (err < 0) { 268160ce86c7SWei Liu goto out; 268260ce86c7SWei Liu } 26835b3c77aaSGreg Kurz v9fs_path_write_lock(s); 268460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26855b3c77aaSGreg Kurz v9fs_path_unlock(s); 268660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 268760ce86c7SWei Liu int32_t ofid = atoi(extension.data); 268860ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 268960ce86c7SWei Liu if (ofidp == NULL) { 269060ce86c7SWei Liu err = -EINVAL; 269160ce86c7SWei Liu goto out; 269260ce86c7SWei Liu } 269360ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 269460ce86c7SWei Liu put_fid(pdu, ofidp); 269560ce86c7SWei Liu if (err < 0) { 269660ce86c7SWei Liu goto out; 269760ce86c7SWei Liu } 269860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 269960ce86c7SWei Liu if (err < 0) { 270060ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 270160ce86c7SWei Liu goto out; 270260ce86c7SWei Liu } 27035b3c77aaSGreg Kurz v9fs_path_write_lock(s); 270460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27055b3c77aaSGreg Kurz v9fs_path_unlock(s); 270660ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 270760ce86c7SWei Liu if (err < 0) { 270860ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 270960ce86c7SWei Liu goto out; 271060ce86c7SWei Liu } 271160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 271260ce86c7SWei Liu char ctype; 271360ce86c7SWei Liu uint32_t major, minor; 271460ce86c7SWei Liu mode_t nmode = 0; 271560ce86c7SWei Liu 271660ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 271760ce86c7SWei Liu err = -errno; 271860ce86c7SWei Liu goto out; 271960ce86c7SWei Liu } 272060ce86c7SWei Liu 272160ce86c7SWei Liu switch (ctype) { 272260ce86c7SWei Liu case 'c': 272360ce86c7SWei Liu nmode = S_IFCHR; 272460ce86c7SWei Liu break; 272560ce86c7SWei Liu case 'b': 272660ce86c7SWei Liu nmode = S_IFBLK; 272760ce86c7SWei Liu break; 272860ce86c7SWei Liu default: 272960ce86c7SWei Liu err = -EIO; 273060ce86c7SWei Liu goto out; 273160ce86c7SWei Liu } 273260ce86c7SWei Liu 273360ce86c7SWei Liu nmode |= perm & 0777; 273460ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 273560ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 273660ce86c7SWei Liu if (err < 0) { 273760ce86c7SWei Liu goto out; 273860ce86c7SWei Liu } 273960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 274060ce86c7SWei Liu if (err < 0) { 274160ce86c7SWei Liu goto out; 274260ce86c7SWei Liu } 27435b3c77aaSGreg Kurz v9fs_path_write_lock(s); 274460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27455b3c77aaSGreg Kurz v9fs_path_unlock(s); 274660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 274760ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 274860ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 274960ce86c7SWei Liu if (err < 0) { 275060ce86c7SWei Liu goto out; 275160ce86c7SWei Liu } 275260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 275360ce86c7SWei Liu if (err < 0) { 275460ce86c7SWei Liu goto out; 275560ce86c7SWei Liu } 27565b3c77aaSGreg Kurz v9fs_path_write_lock(s); 275760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27585b3c77aaSGreg Kurz v9fs_path_unlock(s); 275960ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 276060ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 276160ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 276260ce86c7SWei Liu if (err < 0) { 276360ce86c7SWei Liu goto out; 276460ce86c7SWei Liu } 276560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 276660ce86c7SWei Liu if (err < 0) { 276760ce86c7SWei Liu goto out; 276860ce86c7SWei Liu } 27695b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277060ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27715b3c77aaSGreg Kurz v9fs_path_unlock(s); 277260ce86c7SWei Liu } else { 277360ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 277460ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 277560ce86c7SWei Liu if (err < 0) { 277660ce86c7SWei Liu goto out; 277760ce86c7SWei Liu } 277860ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 277960ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 278060ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 278160ce86c7SWei Liu /* 278260ce86c7SWei Liu * We let the host file system do O_EXCL check 278360ce86c7SWei Liu * We should not reclaim such fd 278460ce86c7SWei Liu */ 278560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 278660ce86c7SWei Liu } 278760ce86c7SWei Liu } 278860ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 27893b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 27903b5ee9e8SAntonios Motakis if (err < 0) { 27913b5ee9e8SAntonios Motakis goto out; 27923b5ee9e8SAntonios Motakis } 279360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 279460ce86c7SWei Liu if (err < 0) { 279560ce86c7SWei Liu goto out; 279660ce86c7SWei Liu } 279760ce86c7SWei Liu err += offset; 279860ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 279960ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 280060ce86c7SWei Liu out: 280160ce86c7SWei Liu put_fid(pdu, fidp); 280260ce86c7SWei Liu out_nofid: 280360ce86c7SWei Liu pdu_complete(pdu, err); 280460ce86c7SWei Liu v9fs_string_free(&name); 280560ce86c7SWei Liu v9fs_string_free(&extension); 280660ce86c7SWei Liu v9fs_path_free(&path); 280760ce86c7SWei Liu } 280860ce86c7SWei Liu 28098440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 281060ce86c7SWei Liu { 281160ce86c7SWei Liu V9fsPDU *pdu = opaque; 281260ce86c7SWei Liu V9fsString name; 281360ce86c7SWei Liu V9fsString symname; 281460ce86c7SWei Liu V9fsFidState *dfidp; 281560ce86c7SWei Liu V9fsQID qid; 281660ce86c7SWei Liu struct stat stbuf; 281760ce86c7SWei Liu int32_t dfid; 281860ce86c7SWei Liu int err = 0; 281960ce86c7SWei Liu gid_t gid; 282060ce86c7SWei Liu size_t offset = 7; 282160ce86c7SWei Liu 282260ce86c7SWei Liu v9fs_string_init(&name); 282360ce86c7SWei Liu v9fs_string_init(&symname); 282460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 282560ce86c7SWei Liu if (err < 0) { 282660ce86c7SWei Liu goto out_nofid; 282760ce86c7SWei Liu } 282860ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 282960ce86c7SWei Liu 2830fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2831fff39a7aSGreg Kurz err = -ENOENT; 2832fff39a7aSGreg Kurz goto out_nofid; 2833fff39a7aSGreg Kurz } 2834fff39a7aSGreg Kurz 2835805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2836805b5d98SGreg Kurz err = -EEXIST; 2837805b5d98SGreg Kurz goto out_nofid; 2838805b5d98SGreg Kurz } 2839805b5d98SGreg Kurz 284060ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 284160ce86c7SWei Liu if (dfidp == NULL) { 284260ce86c7SWei Liu err = -EINVAL; 284360ce86c7SWei Liu goto out_nofid; 284460ce86c7SWei Liu } 284560ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 284660ce86c7SWei Liu if (err < 0) { 284760ce86c7SWei Liu goto out; 284860ce86c7SWei Liu } 28493b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28503b5ee9e8SAntonios Motakis if (err < 0) { 28513b5ee9e8SAntonios Motakis goto out; 28523b5ee9e8SAntonios Motakis } 285360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 285460ce86c7SWei Liu if (err < 0) { 285560ce86c7SWei Liu goto out; 285660ce86c7SWei Liu } 285760ce86c7SWei Liu err += offset; 285860ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 285960ce86c7SWei Liu qid.type, qid.version, qid.path); 286060ce86c7SWei Liu out: 286160ce86c7SWei Liu put_fid(pdu, dfidp); 286260ce86c7SWei Liu out_nofid: 286360ce86c7SWei Liu pdu_complete(pdu, err); 286460ce86c7SWei Liu v9fs_string_free(&name); 286560ce86c7SWei Liu v9fs_string_free(&symname); 286660ce86c7SWei Liu } 286760ce86c7SWei Liu 2868a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 286960ce86c7SWei Liu { 287060ce86c7SWei Liu ssize_t err; 287160ce86c7SWei Liu int16_t tag; 287260ce86c7SWei Liu size_t offset = 7; 2873d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 287460ce86c7SWei Liu V9fsPDU *pdu = opaque; 287560ce86c7SWei Liu V9fsState *s = pdu->s; 287660ce86c7SWei Liu 287760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 287860ce86c7SWei Liu if (err < 0) { 287960ce86c7SWei Liu pdu_complete(pdu, err); 288060ce86c7SWei Liu return; 288160ce86c7SWei Liu } 288260ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 288360ce86c7SWei Liu 2884d5f2af7bSGreg Kurz if (pdu->tag == tag) { 28853dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2886d5f2af7bSGreg Kurz } else { 288760ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 288860ce86c7SWei Liu if (cancel_pdu->tag == tag) { 288960ce86c7SWei Liu break; 289060ce86c7SWei Liu } 289160ce86c7SWei Liu } 2892d5f2af7bSGreg Kurz } 289360ce86c7SWei Liu if (cancel_pdu) { 289460ce86c7SWei Liu cancel_pdu->cancelled = 1; 289560ce86c7SWei Liu /* 289660ce86c7SWei Liu * Wait for pdu to complete. 289760ce86c7SWei Liu */ 28981ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 289918adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 290060ce86c7SWei Liu cancel_pdu->cancelled = 0; 290160ce86c7SWei Liu pdu_free(cancel_pdu); 290260ce86c7SWei Liu } 290318adde86SGreg Kurz } 290460ce86c7SWei Liu pdu_complete(pdu, 7); 290560ce86c7SWei Liu } 290660ce86c7SWei Liu 29078440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 290860ce86c7SWei Liu { 290960ce86c7SWei Liu V9fsPDU *pdu = opaque; 291060ce86c7SWei Liu int32_t dfid, oldfid; 291160ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 291260ce86c7SWei Liu V9fsString name; 291360ce86c7SWei Liu size_t offset = 7; 291460ce86c7SWei Liu int err = 0; 291560ce86c7SWei Liu 291660ce86c7SWei Liu v9fs_string_init(&name); 291760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 291860ce86c7SWei Liu if (err < 0) { 291960ce86c7SWei Liu goto out_nofid; 292060ce86c7SWei Liu } 292160ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 292260ce86c7SWei Liu 2923fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2924fff39a7aSGreg Kurz err = -ENOENT; 2925fff39a7aSGreg Kurz goto out_nofid; 2926fff39a7aSGreg Kurz } 2927fff39a7aSGreg Kurz 2928805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2929805b5d98SGreg Kurz err = -EEXIST; 2930805b5d98SGreg Kurz goto out_nofid; 2931805b5d98SGreg Kurz } 2932805b5d98SGreg Kurz 293360ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 293460ce86c7SWei Liu if (dfidp == NULL) { 293560ce86c7SWei Liu err = -ENOENT; 293660ce86c7SWei Liu goto out_nofid; 293760ce86c7SWei Liu } 293860ce86c7SWei Liu 293960ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 294060ce86c7SWei Liu if (oldfidp == NULL) { 294160ce86c7SWei Liu err = -ENOENT; 294260ce86c7SWei Liu goto out; 294360ce86c7SWei Liu } 294460ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 294560ce86c7SWei Liu if (!err) { 294660ce86c7SWei Liu err = offset; 294760ce86c7SWei Liu } 29484c158678SLi Qiang put_fid(pdu, oldfidp); 294960ce86c7SWei Liu out: 295060ce86c7SWei Liu put_fid(pdu, dfidp); 295160ce86c7SWei Liu out_nofid: 295260ce86c7SWei Liu v9fs_string_free(&name); 295360ce86c7SWei Liu pdu_complete(pdu, err); 295460ce86c7SWei Liu } 295560ce86c7SWei Liu 295660ce86c7SWei Liu /* Only works with path name based fid */ 29578440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 295860ce86c7SWei Liu { 295960ce86c7SWei Liu int32_t fid; 296060ce86c7SWei Liu int err = 0; 296160ce86c7SWei Liu size_t offset = 7; 296260ce86c7SWei Liu V9fsFidState *fidp; 296360ce86c7SWei Liu V9fsPDU *pdu = opaque; 296460ce86c7SWei Liu 296560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 296660ce86c7SWei Liu if (err < 0) { 296760ce86c7SWei Liu goto out_nofid; 296860ce86c7SWei Liu } 296960ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 297060ce86c7SWei Liu 297160ce86c7SWei Liu fidp = get_fid(pdu, fid); 297260ce86c7SWei Liu if (fidp == NULL) { 297360ce86c7SWei Liu err = -EINVAL; 297460ce86c7SWei Liu goto out_nofid; 297560ce86c7SWei Liu } 297660ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 297760ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 297860ce86c7SWei Liu err = -EOPNOTSUPP; 297960ce86c7SWei Liu goto out_err; 298060ce86c7SWei Liu } 298160ce86c7SWei Liu /* 298260ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 298360ce86c7SWei Liu * the file later. So don't reclaim fd 298460ce86c7SWei Liu */ 298560ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 298660ce86c7SWei Liu if (err < 0) { 298760ce86c7SWei Liu goto out_err; 298860ce86c7SWei Liu } 298960ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 299060ce86c7SWei Liu if (!err) { 299160ce86c7SWei Liu err = offset; 299260ce86c7SWei Liu } 299360ce86c7SWei Liu out_err: 299460ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 299560ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 299660ce86c7SWei Liu put_fid(pdu, fidp); 299760ce86c7SWei Liu out_nofid: 299860ce86c7SWei Liu pdu_complete(pdu, err); 299960ce86c7SWei Liu } 300060ce86c7SWei Liu 30018440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 300260ce86c7SWei Liu { 300360ce86c7SWei Liu int err = 0; 300460ce86c7SWei Liu V9fsString name; 300567e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 300660ce86c7SWei Liu size_t offset = 7; 300760ce86c7SWei Liu V9fsPath path; 300860ce86c7SWei Liu V9fsFidState *dfidp; 300960ce86c7SWei Liu V9fsPDU *pdu = opaque; 301060ce86c7SWei Liu 301160ce86c7SWei Liu v9fs_string_init(&name); 301260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 301360ce86c7SWei Liu if (err < 0) { 301460ce86c7SWei Liu goto out_nofid; 301560ce86c7SWei Liu } 3016fff39a7aSGreg Kurz 3017fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3018fff39a7aSGreg Kurz err = -ENOENT; 3019fff39a7aSGreg Kurz goto out_nofid; 3020fff39a7aSGreg Kurz } 3021fff39a7aSGreg Kurz 3022805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3023805b5d98SGreg Kurz err = -EINVAL; 3024805b5d98SGreg Kurz goto out_nofid; 3025805b5d98SGreg Kurz } 3026805b5d98SGreg Kurz 3027805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3028805b5d98SGreg Kurz err = -ENOTEMPTY; 3029805b5d98SGreg Kurz goto out_nofid; 3030805b5d98SGreg Kurz } 3031805b5d98SGreg Kurz 303267e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 303367e87345SKeno Fischer err = -EINVAL; 303467e87345SKeno Fischer goto out_nofid; 303567e87345SKeno Fischer } 303667e87345SKeno Fischer 303767e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 303867e87345SKeno Fischer rflags |= AT_REMOVEDIR; 303967e87345SKeno Fischer } 304067e87345SKeno Fischer 304160ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 304260ce86c7SWei Liu if (dfidp == NULL) { 304360ce86c7SWei Liu err = -EINVAL; 304460ce86c7SWei Liu goto out_nofid; 304560ce86c7SWei Liu } 304660ce86c7SWei Liu /* 304760ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 304860ce86c7SWei Liu * the file later. So don't reclaim fd 304960ce86c7SWei Liu */ 305060ce86c7SWei Liu v9fs_path_init(&path); 305160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 305260ce86c7SWei Liu if (err < 0) { 305360ce86c7SWei Liu goto out_err; 305460ce86c7SWei Liu } 305560ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 305660ce86c7SWei Liu if (err < 0) { 305760ce86c7SWei Liu goto out_err; 305860ce86c7SWei Liu } 305967e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 306060ce86c7SWei Liu if (!err) { 306160ce86c7SWei Liu err = offset; 306260ce86c7SWei Liu } 306360ce86c7SWei Liu out_err: 306460ce86c7SWei Liu put_fid(pdu, dfidp); 306560ce86c7SWei Liu v9fs_path_free(&path); 306660ce86c7SWei Liu out_nofid: 306760ce86c7SWei Liu pdu_complete(pdu, err); 306860ce86c7SWei Liu v9fs_string_free(&name); 306960ce86c7SWei Liu } 307060ce86c7SWei Liu 307160ce86c7SWei Liu 307260ce86c7SWei Liu /* Only works with path name based fid */ 30738440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 30748440e22eSGreg Kurz int32_t newdirfid, 30758440e22eSGreg Kurz V9fsString *name) 307660ce86c7SWei Liu { 307760ce86c7SWei Liu int err = 0; 307860ce86c7SWei Liu V9fsPath new_path; 307960ce86c7SWei Liu V9fsFidState *tfidp; 308060ce86c7SWei Liu V9fsState *s = pdu->s; 308160ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 308260ce86c7SWei Liu 308360ce86c7SWei Liu v9fs_path_init(&new_path); 308460ce86c7SWei Liu if (newdirfid != -1) { 308560ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 308660ce86c7SWei Liu if (dirfidp == NULL) { 3087b858e80aSDaniel Henrique Barboza return -ENOENT; 308860ce86c7SWei Liu } 308949dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 309049dd946bSGreg Kurz err = -EINVAL; 309149dd946bSGreg Kurz goto out; 309249dd946bSGreg Kurz } 30934fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 30944fa62005SGreg Kurz if (err < 0) { 30954fa62005SGreg Kurz goto out; 30964fa62005SGreg Kurz } 309760ce86c7SWei Liu } else { 30984d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 30994d8bc733SJan Dakinevich V9fsPath dir_path; 31004d8bc733SJan Dakinevich 31014d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31024d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31034d8bc733SJan Dakinevich g_free(dir_name); 31044d8bc733SJan Dakinevich 31054d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31064d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31074fa62005SGreg Kurz if (err < 0) { 31084fa62005SGreg Kurz goto out; 31094fa62005SGreg Kurz } 311060ce86c7SWei Liu } 311160ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 311260ce86c7SWei Liu if (err < 0) { 311360ce86c7SWei Liu goto out; 311460ce86c7SWei Liu } 311560ce86c7SWei Liu /* 311660ce86c7SWei Liu * Fixup fid's pointing to the old name to 311760ce86c7SWei Liu * start pointing to the new name 311860ce86c7SWei Liu */ 3119*feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 312060ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 312160ce86c7SWei Liu /* replace the name */ 312260ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 312360ce86c7SWei Liu } 312460ce86c7SWei Liu } 312560ce86c7SWei Liu out: 312660ce86c7SWei Liu if (dirfidp) { 312760ce86c7SWei Liu put_fid(pdu, dirfidp); 312860ce86c7SWei Liu } 312960ce86c7SWei Liu v9fs_path_free(&new_path); 313060ce86c7SWei Liu return err; 313160ce86c7SWei Liu } 313260ce86c7SWei Liu 313360ce86c7SWei Liu /* Only works with path name based fid */ 31348440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 313560ce86c7SWei Liu { 313660ce86c7SWei Liu int32_t fid; 313760ce86c7SWei Liu ssize_t err = 0; 313860ce86c7SWei Liu size_t offset = 7; 313960ce86c7SWei Liu V9fsString name; 314060ce86c7SWei Liu int32_t newdirfid; 314160ce86c7SWei Liu V9fsFidState *fidp; 314260ce86c7SWei Liu V9fsPDU *pdu = opaque; 314360ce86c7SWei Liu V9fsState *s = pdu->s; 314460ce86c7SWei Liu 314560ce86c7SWei Liu v9fs_string_init(&name); 314660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 314760ce86c7SWei Liu if (err < 0) { 314860ce86c7SWei Liu goto out_nofid; 314960ce86c7SWei Liu } 3150fff39a7aSGreg Kurz 3151fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3152fff39a7aSGreg Kurz err = -ENOENT; 3153fff39a7aSGreg Kurz goto out_nofid; 3154fff39a7aSGreg Kurz } 3155fff39a7aSGreg Kurz 3156805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3157805b5d98SGreg Kurz err = -EISDIR; 3158805b5d98SGreg Kurz goto out_nofid; 3159805b5d98SGreg Kurz } 3160805b5d98SGreg Kurz 316160ce86c7SWei Liu fidp = get_fid(pdu, fid); 316260ce86c7SWei Liu if (fidp == NULL) { 316360ce86c7SWei Liu err = -ENOENT; 316460ce86c7SWei Liu goto out_nofid; 316560ce86c7SWei Liu } 316649dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 316749dd946bSGreg Kurz err = -EINVAL; 316849dd946bSGreg Kurz goto out; 316949dd946bSGreg Kurz } 317060ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 317160ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 317260ce86c7SWei Liu err = -EOPNOTSUPP; 317360ce86c7SWei Liu goto out; 317460ce86c7SWei Liu } 317560ce86c7SWei Liu v9fs_path_write_lock(s); 317660ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 317760ce86c7SWei Liu v9fs_path_unlock(s); 317860ce86c7SWei Liu if (!err) { 317960ce86c7SWei Liu err = offset; 318060ce86c7SWei Liu } 318160ce86c7SWei Liu out: 318260ce86c7SWei Liu put_fid(pdu, fidp); 318360ce86c7SWei Liu out_nofid: 318460ce86c7SWei Liu pdu_complete(pdu, err); 318560ce86c7SWei Liu v9fs_string_free(&name); 318660ce86c7SWei Liu } 318760ce86c7SWei Liu 31884fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 31898440e22eSGreg Kurz V9fsString *old_name, 31908440e22eSGreg Kurz V9fsPath *newdir, 319160ce86c7SWei Liu V9fsString *new_name) 319260ce86c7SWei Liu { 319360ce86c7SWei Liu V9fsFidState *tfidp; 319460ce86c7SWei Liu V9fsPath oldpath, newpath; 319560ce86c7SWei Liu V9fsState *s = pdu->s; 31964fa62005SGreg Kurz int err; 319760ce86c7SWei Liu 319860ce86c7SWei Liu v9fs_path_init(&oldpath); 319960ce86c7SWei Liu v9fs_path_init(&newpath); 32004fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32014fa62005SGreg Kurz if (err < 0) { 32024fa62005SGreg Kurz goto out; 32034fa62005SGreg Kurz } 32044fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32054fa62005SGreg Kurz if (err < 0) { 32064fa62005SGreg Kurz goto out; 32074fa62005SGreg Kurz } 320860ce86c7SWei Liu 320960ce86c7SWei Liu /* 321060ce86c7SWei Liu * Fixup fid's pointing to the old name to 321160ce86c7SWei Liu * start pointing to the new name 321260ce86c7SWei Liu */ 3213*feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 321460ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 321560ce86c7SWei Liu /* replace the name */ 321660ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 321760ce86c7SWei Liu } 321860ce86c7SWei Liu } 32194fa62005SGreg Kurz out: 322060ce86c7SWei Liu v9fs_path_free(&oldpath); 322160ce86c7SWei Liu v9fs_path_free(&newpath); 32224fa62005SGreg Kurz return err; 322360ce86c7SWei Liu } 322460ce86c7SWei Liu 32258440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 32268440e22eSGreg Kurz V9fsString *old_name, 32278440e22eSGreg Kurz int32_t newdirfid, 322860ce86c7SWei Liu V9fsString *new_name) 322960ce86c7SWei Liu { 323060ce86c7SWei Liu int err = 0; 323160ce86c7SWei Liu V9fsState *s = pdu->s; 323260ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 323360ce86c7SWei Liu 323460ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 323560ce86c7SWei Liu if (olddirfidp == NULL) { 323660ce86c7SWei Liu err = -ENOENT; 323760ce86c7SWei Liu goto out; 323860ce86c7SWei Liu } 323960ce86c7SWei Liu if (newdirfid != -1) { 324060ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 324160ce86c7SWei Liu if (newdirfidp == NULL) { 324260ce86c7SWei Liu err = -ENOENT; 324360ce86c7SWei Liu goto out; 324460ce86c7SWei Liu } 324560ce86c7SWei Liu } else { 324660ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 324760ce86c7SWei Liu } 324860ce86c7SWei Liu 324960ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 325060ce86c7SWei Liu &newdirfidp->path, new_name); 325160ce86c7SWei Liu if (err < 0) { 325260ce86c7SWei Liu goto out; 325360ce86c7SWei Liu } 325460ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 325560ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 32564fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 325760ce86c7SWei Liu &newdirfidp->path, new_name); 325860ce86c7SWei Liu } 325960ce86c7SWei Liu out: 326060ce86c7SWei Liu if (olddirfidp) { 326160ce86c7SWei Liu put_fid(pdu, olddirfidp); 326260ce86c7SWei Liu } 326360ce86c7SWei Liu if (newdirfidp) { 326460ce86c7SWei Liu put_fid(pdu, newdirfidp); 326560ce86c7SWei Liu } 326660ce86c7SWei Liu return err; 326760ce86c7SWei Liu } 326860ce86c7SWei Liu 32698440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 327060ce86c7SWei Liu { 327160ce86c7SWei Liu ssize_t err = 0; 327260ce86c7SWei Liu size_t offset = 7; 327360ce86c7SWei Liu V9fsPDU *pdu = opaque; 327460ce86c7SWei Liu V9fsState *s = pdu->s; 327560ce86c7SWei Liu int32_t olddirfid, newdirfid; 327660ce86c7SWei Liu V9fsString old_name, new_name; 327760ce86c7SWei Liu 327860ce86c7SWei Liu v9fs_string_init(&old_name); 327960ce86c7SWei Liu v9fs_string_init(&new_name); 328060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 328160ce86c7SWei Liu &old_name, &newdirfid, &new_name); 328260ce86c7SWei Liu if (err < 0) { 328360ce86c7SWei Liu goto out_err; 328460ce86c7SWei Liu } 328560ce86c7SWei Liu 3286fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3287fff39a7aSGreg Kurz err = -ENOENT; 3288fff39a7aSGreg Kurz goto out_err; 3289fff39a7aSGreg Kurz } 3290fff39a7aSGreg Kurz 3291805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3292805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3293805b5d98SGreg Kurz err = -EISDIR; 3294805b5d98SGreg Kurz goto out_err; 3295805b5d98SGreg Kurz } 3296805b5d98SGreg Kurz 329760ce86c7SWei Liu v9fs_path_write_lock(s); 329860ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 329960ce86c7SWei Liu &old_name, newdirfid, &new_name); 330060ce86c7SWei Liu v9fs_path_unlock(s); 330160ce86c7SWei Liu if (!err) { 330260ce86c7SWei Liu err = offset; 330360ce86c7SWei Liu } 330460ce86c7SWei Liu 330560ce86c7SWei Liu out_err: 330660ce86c7SWei Liu pdu_complete(pdu, err); 330760ce86c7SWei Liu v9fs_string_free(&old_name); 330860ce86c7SWei Liu v9fs_string_free(&new_name); 330960ce86c7SWei Liu } 331060ce86c7SWei Liu 33118440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 331260ce86c7SWei Liu { 331360ce86c7SWei Liu int32_t fid; 331460ce86c7SWei Liu int err = 0; 331560ce86c7SWei Liu int16_t unused; 331660ce86c7SWei Liu V9fsStat v9stat; 331760ce86c7SWei Liu size_t offset = 7; 331860ce86c7SWei Liu struct stat stbuf; 331960ce86c7SWei Liu V9fsFidState *fidp; 332060ce86c7SWei Liu V9fsPDU *pdu = opaque; 33211d203986SGreg Kurz V9fsState *s = pdu->s; 332260ce86c7SWei Liu 332360ce86c7SWei Liu v9fs_stat_init(&v9stat); 332460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 332560ce86c7SWei Liu if (err < 0) { 332660ce86c7SWei Liu goto out_nofid; 332760ce86c7SWei Liu } 332860ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 332960ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 333060ce86c7SWei Liu 333160ce86c7SWei Liu fidp = get_fid(pdu, fid); 333260ce86c7SWei Liu if (fidp == NULL) { 333360ce86c7SWei Liu err = -EINVAL; 333460ce86c7SWei Liu goto out_nofid; 333560ce86c7SWei Liu } 333660ce86c7SWei Liu /* do we need to sync the file? */ 333760ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 333860ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 333960ce86c7SWei Liu goto out; 334060ce86c7SWei Liu } 334160ce86c7SWei Liu if (v9stat.mode != -1) { 334260ce86c7SWei Liu uint32_t v9_mode; 334360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 334460ce86c7SWei Liu if (err < 0) { 334560ce86c7SWei Liu goto out; 334660ce86c7SWei Liu } 334760ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 334860ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 334960ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 335060ce86c7SWei Liu /* Attempting to change the type */ 335160ce86c7SWei Liu err = -EIO; 335260ce86c7SWei Liu goto out; 335360ce86c7SWei Liu } 335460ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 335560ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 335660ce86c7SWei Liu &v9stat.extension)); 335760ce86c7SWei Liu if (err < 0) { 335860ce86c7SWei Liu goto out; 335960ce86c7SWei Liu } 336060ce86c7SWei Liu } 336160ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 336260ce86c7SWei Liu struct timespec times[2]; 336360ce86c7SWei Liu if (v9stat.atime != -1) { 336460ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 336560ce86c7SWei Liu times[0].tv_nsec = 0; 336660ce86c7SWei Liu } else { 336760ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 336860ce86c7SWei Liu } 336960ce86c7SWei Liu if (v9stat.mtime != -1) { 337060ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 337160ce86c7SWei Liu times[1].tv_nsec = 0; 337260ce86c7SWei Liu } else { 337360ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 337460ce86c7SWei Liu } 337560ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 337660ce86c7SWei Liu if (err < 0) { 337760ce86c7SWei Liu goto out; 337860ce86c7SWei Liu } 337960ce86c7SWei Liu } 338060ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 338160ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 338260ce86c7SWei Liu if (err < 0) { 338360ce86c7SWei Liu goto out; 338460ce86c7SWei Liu } 338560ce86c7SWei Liu } 338660ce86c7SWei Liu if (v9stat.name.size != 0) { 33871d203986SGreg Kurz v9fs_path_write_lock(s); 338860ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 33891d203986SGreg Kurz v9fs_path_unlock(s); 339060ce86c7SWei Liu if (err < 0) { 339160ce86c7SWei Liu goto out; 339260ce86c7SWei Liu } 339360ce86c7SWei Liu } 339460ce86c7SWei Liu if (v9stat.length != -1) { 339560ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 339660ce86c7SWei Liu if (err < 0) { 339760ce86c7SWei Liu goto out; 339860ce86c7SWei Liu } 339960ce86c7SWei Liu } 340060ce86c7SWei Liu err = offset; 340160ce86c7SWei Liu out: 340260ce86c7SWei Liu put_fid(pdu, fidp); 340360ce86c7SWei Liu out_nofid: 340460ce86c7SWei Liu v9fs_stat_free(&v9stat); 340560ce86c7SWei Liu pdu_complete(pdu, err); 340660ce86c7SWei Liu } 340760ce86c7SWei Liu 340860ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 340960ce86c7SWei Liu { 341060ce86c7SWei Liu uint32_t f_type; 341160ce86c7SWei Liu uint32_t f_bsize; 341260ce86c7SWei Liu uint64_t f_blocks; 341360ce86c7SWei Liu uint64_t f_bfree; 341460ce86c7SWei Liu uint64_t f_bavail; 341560ce86c7SWei Liu uint64_t f_files; 341660ce86c7SWei Liu uint64_t f_ffree; 341760ce86c7SWei Liu uint64_t fsid_val; 341860ce86c7SWei Liu uint32_t f_namelen; 341960ce86c7SWei Liu size_t offset = 7; 342060ce86c7SWei Liu int32_t bsize_factor; 342160ce86c7SWei Liu 342260ce86c7SWei Liu /* 342360ce86c7SWei Liu * compute bsize factor based on host file system block size 342460ce86c7SWei Liu * and client msize 342560ce86c7SWei Liu */ 342660ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 342760ce86c7SWei Liu if (!bsize_factor) { 342860ce86c7SWei Liu bsize_factor = 1; 342960ce86c7SWei Liu } 343060ce86c7SWei Liu f_type = stbuf->f_type; 343160ce86c7SWei Liu f_bsize = stbuf->f_bsize; 343260ce86c7SWei Liu f_bsize *= bsize_factor; 343360ce86c7SWei Liu /* 343460ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 343560ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 343660ce86c7SWei Liu * blocks by bsize factor 343760ce86c7SWei Liu */ 343860ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 343960ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 344060ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 344160ce86c7SWei Liu f_files = stbuf->f_files; 344260ce86c7SWei Liu f_ffree = stbuf->f_ffree; 344360ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 344460ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 344560ce86c7SWei Liu f_namelen = stbuf->f_namelen; 344660ce86c7SWei Liu 344760ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 344860ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 344960ce86c7SWei Liu f_bavail, f_files, f_ffree, 345060ce86c7SWei Liu fsid_val, f_namelen); 345160ce86c7SWei Liu } 345260ce86c7SWei Liu 34538440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 345460ce86c7SWei Liu { 345560ce86c7SWei Liu int32_t fid; 345660ce86c7SWei Liu ssize_t retval = 0; 345760ce86c7SWei Liu size_t offset = 7; 345860ce86c7SWei Liu V9fsFidState *fidp; 345960ce86c7SWei Liu struct statfs stbuf; 346060ce86c7SWei Liu V9fsPDU *pdu = opaque; 346160ce86c7SWei Liu V9fsState *s = pdu->s; 346260ce86c7SWei Liu 346360ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 346460ce86c7SWei Liu if (retval < 0) { 346560ce86c7SWei Liu goto out_nofid; 346660ce86c7SWei Liu } 346760ce86c7SWei Liu fidp = get_fid(pdu, fid); 346860ce86c7SWei Liu if (fidp == NULL) { 346960ce86c7SWei Liu retval = -ENOENT; 347060ce86c7SWei Liu goto out_nofid; 347160ce86c7SWei Liu } 347260ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 347360ce86c7SWei Liu if (retval < 0) { 347460ce86c7SWei Liu goto out; 347560ce86c7SWei Liu } 347660ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 347760ce86c7SWei Liu if (retval < 0) { 347860ce86c7SWei Liu goto out; 347960ce86c7SWei Liu } 348060ce86c7SWei Liu retval += offset; 348160ce86c7SWei Liu out: 348260ce86c7SWei Liu put_fid(pdu, fidp); 348360ce86c7SWei Liu out_nofid: 348460ce86c7SWei Liu pdu_complete(pdu, retval); 348560ce86c7SWei Liu } 348660ce86c7SWei Liu 34878440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 348860ce86c7SWei Liu { 348960ce86c7SWei Liu 349060ce86c7SWei Liu int mode; 349160ce86c7SWei Liu gid_t gid; 349260ce86c7SWei Liu int32_t fid; 349360ce86c7SWei Liu V9fsQID qid; 349460ce86c7SWei Liu int err = 0; 349560ce86c7SWei Liu int major, minor; 349660ce86c7SWei Liu size_t offset = 7; 349760ce86c7SWei Liu V9fsString name; 349860ce86c7SWei Liu struct stat stbuf; 349960ce86c7SWei Liu V9fsFidState *fidp; 350060ce86c7SWei Liu V9fsPDU *pdu = opaque; 350160ce86c7SWei Liu 350260ce86c7SWei Liu v9fs_string_init(&name); 350360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 350460ce86c7SWei Liu &major, &minor, &gid); 350560ce86c7SWei Liu if (err < 0) { 350660ce86c7SWei Liu goto out_nofid; 350760ce86c7SWei Liu } 350860ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 350960ce86c7SWei Liu 3510fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3511fff39a7aSGreg Kurz err = -ENOENT; 3512fff39a7aSGreg Kurz goto out_nofid; 3513fff39a7aSGreg Kurz } 3514fff39a7aSGreg Kurz 3515805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3516805b5d98SGreg Kurz err = -EEXIST; 3517805b5d98SGreg Kurz goto out_nofid; 3518805b5d98SGreg Kurz } 3519805b5d98SGreg Kurz 352060ce86c7SWei Liu fidp = get_fid(pdu, fid); 352160ce86c7SWei Liu if (fidp == NULL) { 352260ce86c7SWei Liu err = -ENOENT; 352360ce86c7SWei Liu goto out_nofid; 352460ce86c7SWei Liu } 352560ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 352660ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 352760ce86c7SWei Liu if (err < 0) { 352860ce86c7SWei Liu goto out; 352960ce86c7SWei Liu } 35303b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 35313b5ee9e8SAntonios Motakis if (err < 0) { 35323b5ee9e8SAntonios Motakis goto out; 35333b5ee9e8SAntonios Motakis } 353460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 353560ce86c7SWei Liu if (err < 0) { 353660ce86c7SWei Liu goto out; 353760ce86c7SWei Liu } 353860ce86c7SWei Liu err += offset; 353960ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 354060ce86c7SWei Liu qid.type, qid.version, qid.path); 354160ce86c7SWei Liu out: 354260ce86c7SWei Liu put_fid(pdu, fidp); 354360ce86c7SWei Liu out_nofid: 354460ce86c7SWei Liu pdu_complete(pdu, err); 354560ce86c7SWei Liu v9fs_string_free(&name); 354660ce86c7SWei Liu } 354760ce86c7SWei Liu 354860ce86c7SWei Liu /* 354960ce86c7SWei Liu * Implement posix byte range locking code 355060ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 355160ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 355260ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 355360ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 355460ce86c7SWei Liu * So when a TLOCK request comes, always return success 355560ce86c7SWei Liu */ 35568440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 355760ce86c7SWei Liu { 355860ce86c7SWei Liu V9fsFlock flock; 355960ce86c7SWei Liu size_t offset = 7; 356060ce86c7SWei Liu struct stat stbuf; 356160ce86c7SWei Liu V9fsFidState *fidp; 356260ce86c7SWei Liu int32_t fid, err = 0; 356360ce86c7SWei Liu V9fsPDU *pdu = opaque; 356460ce86c7SWei Liu 356560ce86c7SWei Liu v9fs_string_init(&flock.client_id); 356660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 356760ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 356860ce86c7SWei Liu &flock.proc_id, &flock.client_id); 356960ce86c7SWei Liu if (err < 0) { 357060ce86c7SWei Liu goto out_nofid; 357160ce86c7SWei Liu } 357260ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 357360ce86c7SWei Liu flock.type, flock.start, flock.length); 357460ce86c7SWei Liu 357560ce86c7SWei Liu 357660ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 357760ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 357860ce86c7SWei Liu err = -EINVAL; 357960ce86c7SWei Liu goto out_nofid; 358060ce86c7SWei Liu } 358160ce86c7SWei Liu fidp = get_fid(pdu, fid); 358260ce86c7SWei Liu if (fidp == NULL) { 358360ce86c7SWei Liu err = -ENOENT; 358460ce86c7SWei Liu goto out_nofid; 358560ce86c7SWei Liu } 358660ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 358760ce86c7SWei Liu if (err < 0) { 358860ce86c7SWei Liu goto out; 358960ce86c7SWei Liu } 35904bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 35914bae2b39SPaolo Bonzini if (err < 0) { 35924bae2b39SPaolo Bonzini goto out; 35934bae2b39SPaolo Bonzini } 35944bae2b39SPaolo Bonzini err += offset; 35954bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 359660ce86c7SWei Liu out: 359760ce86c7SWei Liu put_fid(pdu, fidp); 359860ce86c7SWei Liu out_nofid: 359960ce86c7SWei Liu pdu_complete(pdu, err); 360060ce86c7SWei Liu v9fs_string_free(&flock.client_id); 360160ce86c7SWei Liu } 360260ce86c7SWei Liu 360360ce86c7SWei Liu /* 360460ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 360560ce86c7SWei Liu * handling is done by client's VFS layer. 360660ce86c7SWei Liu */ 36078440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 360860ce86c7SWei Liu { 360960ce86c7SWei Liu size_t offset = 7; 361060ce86c7SWei Liu struct stat stbuf; 361160ce86c7SWei Liu V9fsFidState *fidp; 361260ce86c7SWei Liu V9fsGetlock glock; 361360ce86c7SWei Liu int32_t fid, err = 0; 361460ce86c7SWei Liu V9fsPDU *pdu = opaque; 361560ce86c7SWei Liu 361660ce86c7SWei Liu v9fs_string_init(&glock.client_id); 361760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 361860ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 361960ce86c7SWei Liu &glock.client_id); 362060ce86c7SWei Liu if (err < 0) { 362160ce86c7SWei Liu goto out_nofid; 362260ce86c7SWei Liu } 362360ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 362460ce86c7SWei Liu glock.type, glock.start, glock.length); 362560ce86c7SWei Liu 362660ce86c7SWei Liu fidp = get_fid(pdu, fid); 362760ce86c7SWei Liu if (fidp == NULL) { 362860ce86c7SWei Liu err = -ENOENT; 362960ce86c7SWei Liu goto out_nofid; 363060ce86c7SWei Liu } 363160ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 363260ce86c7SWei Liu if (err < 0) { 363360ce86c7SWei Liu goto out; 363460ce86c7SWei Liu } 363560ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 363660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 363760ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 363860ce86c7SWei Liu &glock.client_id); 363960ce86c7SWei Liu if (err < 0) { 364060ce86c7SWei Liu goto out; 364160ce86c7SWei Liu } 364260ce86c7SWei Liu err += offset; 364360ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 364460ce86c7SWei Liu glock.length, glock.proc_id); 364560ce86c7SWei Liu out: 364660ce86c7SWei Liu put_fid(pdu, fidp); 364760ce86c7SWei Liu out_nofid: 364860ce86c7SWei Liu pdu_complete(pdu, err); 364960ce86c7SWei Liu v9fs_string_free(&glock.client_id); 365060ce86c7SWei Liu } 365160ce86c7SWei Liu 36528440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 365360ce86c7SWei Liu { 365460ce86c7SWei Liu V9fsPDU *pdu = opaque; 365560ce86c7SWei Liu size_t offset = 7; 365660ce86c7SWei Liu int32_t fid; 365760ce86c7SWei Liu struct stat stbuf; 365860ce86c7SWei Liu V9fsQID qid; 365960ce86c7SWei Liu V9fsString name; 366060ce86c7SWei Liu V9fsFidState *fidp; 366160ce86c7SWei Liu gid_t gid; 366260ce86c7SWei Liu int mode; 366360ce86c7SWei Liu int err = 0; 366460ce86c7SWei Liu 366560ce86c7SWei Liu v9fs_string_init(&name); 366660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 366760ce86c7SWei Liu if (err < 0) { 366860ce86c7SWei Liu goto out_nofid; 366960ce86c7SWei Liu } 367060ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 367160ce86c7SWei Liu 3672fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3673fff39a7aSGreg Kurz err = -ENOENT; 3674fff39a7aSGreg Kurz goto out_nofid; 3675fff39a7aSGreg Kurz } 3676fff39a7aSGreg Kurz 3677805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3678805b5d98SGreg Kurz err = -EEXIST; 3679805b5d98SGreg Kurz goto out_nofid; 3680805b5d98SGreg Kurz } 3681805b5d98SGreg Kurz 368260ce86c7SWei Liu fidp = get_fid(pdu, fid); 368360ce86c7SWei Liu if (fidp == NULL) { 368460ce86c7SWei Liu err = -ENOENT; 368560ce86c7SWei Liu goto out_nofid; 368660ce86c7SWei Liu } 368760ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 368860ce86c7SWei Liu if (err < 0) { 368960ce86c7SWei Liu goto out; 369060ce86c7SWei Liu } 36913b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36923b5ee9e8SAntonios Motakis if (err < 0) { 36933b5ee9e8SAntonios Motakis goto out; 36943b5ee9e8SAntonios Motakis } 369560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 369660ce86c7SWei Liu if (err < 0) { 369760ce86c7SWei Liu goto out; 369860ce86c7SWei Liu } 369960ce86c7SWei Liu err += offset; 370060ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 370160ce86c7SWei Liu qid.type, qid.version, qid.path, err); 370260ce86c7SWei Liu out: 370360ce86c7SWei Liu put_fid(pdu, fidp); 370460ce86c7SWei Liu out_nofid: 370560ce86c7SWei Liu pdu_complete(pdu, err); 370660ce86c7SWei Liu v9fs_string_free(&name); 370760ce86c7SWei Liu } 370860ce86c7SWei Liu 37098440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 371060ce86c7SWei Liu { 371160ce86c7SWei Liu int64_t size; 371260ce86c7SWei Liu V9fsString name; 371360ce86c7SWei Liu ssize_t err = 0; 371460ce86c7SWei Liu size_t offset = 7; 371560ce86c7SWei Liu int32_t fid, newfid; 371660ce86c7SWei Liu V9fsFidState *file_fidp; 371760ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 371860ce86c7SWei Liu V9fsPDU *pdu = opaque; 371960ce86c7SWei Liu V9fsState *s = pdu->s; 372060ce86c7SWei Liu 372160ce86c7SWei Liu v9fs_string_init(&name); 372260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 372360ce86c7SWei Liu if (err < 0) { 372460ce86c7SWei Liu goto out_nofid; 372560ce86c7SWei Liu } 372660ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 372760ce86c7SWei Liu 372860ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 372960ce86c7SWei Liu if (file_fidp == NULL) { 373060ce86c7SWei Liu err = -ENOENT; 373160ce86c7SWei Liu goto out_nofid; 373260ce86c7SWei Liu } 373360ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 373460ce86c7SWei Liu if (xattr_fidp == NULL) { 373560ce86c7SWei Liu err = -EINVAL; 373660ce86c7SWei Liu goto out; 373760ce86c7SWei Liu } 373860ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3739ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 374060ce86c7SWei Liu /* 374160ce86c7SWei Liu * listxattr request. Get the size first 374260ce86c7SWei Liu */ 374360ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 374460ce86c7SWei Liu if (size < 0) { 374560ce86c7SWei Liu err = size; 374660ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 374760ce86c7SWei Liu goto out; 374860ce86c7SWei Liu } 374960ce86c7SWei Liu /* 375060ce86c7SWei Liu * Read the xattr value 375160ce86c7SWei Liu */ 375260ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 375360ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3754dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37557bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3756a647502cSKeno Fischer if (size) { 375760ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 375860ce86c7SWei Liu xattr_fidp->fs.xattr.value, 375960ce86c7SWei Liu xattr_fidp->fs.xattr.len); 376060ce86c7SWei Liu if (err < 0) { 376160ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 376260ce86c7SWei Liu goto out; 376360ce86c7SWei Liu } 376460ce86c7SWei Liu } 376560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 376660ce86c7SWei Liu if (err < 0) { 376760ce86c7SWei Liu goto out; 376860ce86c7SWei Liu } 376960ce86c7SWei Liu err += offset; 377060ce86c7SWei Liu } else { 377160ce86c7SWei Liu /* 377260ce86c7SWei Liu * specific xattr fid. We check for xattr 377360ce86c7SWei Liu * presence also collect the xattr size 377460ce86c7SWei Liu */ 377560ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 377660ce86c7SWei Liu &name, NULL, 0); 377760ce86c7SWei Liu if (size < 0) { 377860ce86c7SWei Liu err = size; 377960ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 378060ce86c7SWei Liu goto out; 378160ce86c7SWei Liu } 378260ce86c7SWei Liu /* 378360ce86c7SWei Liu * Read the xattr value 378460ce86c7SWei Liu */ 378560ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 378660ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3787dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37887bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3789a647502cSKeno Fischer if (size) { 379060ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 379160ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 379260ce86c7SWei Liu xattr_fidp->fs.xattr.len); 379360ce86c7SWei Liu if (err < 0) { 379460ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 379560ce86c7SWei Liu goto out; 379660ce86c7SWei Liu } 379760ce86c7SWei Liu } 379860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 379960ce86c7SWei Liu if (err < 0) { 380060ce86c7SWei Liu goto out; 380160ce86c7SWei Liu } 380260ce86c7SWei Liu err += offset; 380360ce86c7SWei Liu } 380460ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 380560ce86c7SWei Liu out: 380660ce86c7SWei Liu put_fid(pdu, file_fidp); 380760ce86c7SWei Liu if (xattr_fidp) { 380860ce86c7SWei Liu put_fid(pdu, xattr_fidp); 380960ce86c7SWei Liu } 381060ce86c7SWei Liu out_nofid: 381160ce86c7SWei Liu pdu_complete(pdu, err); 381260ce86c7SWei Liu v9fs_string_free(&name); 381360ce86c7SWei Liu } 381460ce86c7SWei Liu 38158440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 381660ce86c7SWei Liu { 3817aca6897fSKeno Fischer int flags, rflags = 0; 381860ce86c7SWei Liu int32_t fid; 38193b79ef2cSGreg Kurz uint64_t size; 382060ce86c7SWei Liu ssize_t err = 0; 382160ce86c7SWei Liu V9fsString name; 382260ce86c7SWei Liu size_t offset = 7; 382360ce86c7SWei Liu V9fsFidState *file_fidp; 382460ce86c7SWei Liu V9fsFidState *xattr_fidp; 382560ce86c7SWei Liu V9fsPDU *pdu = opaque; 382660ce86c7SWei Liu 382760ce86c7SWei Liu v9fs_string_init(&name); 382860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 382960ce86c7SWei Liu if (err < 0) { 383060ce86c7SWei Liu goto out_nofid; 383160ce86c7SWei Liu } 383260ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 383360ce86c7SWei Liu 3834aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3835aca6897fSKeno Fischer err = -EINVAL; 3836aca6897fSKeno Fischer goto out_nofid; 3837aca6897fSKeno Fischer } 3838aca6897fSKeno Fischer 3839aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3840aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3841aca6897fSKeno Fischer } 3842aca6897fSKeno Fischer 3843aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3844aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3845aca6897fSKeno Fischer } 3846aca6897fSKeno Fischer 38473b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 38483b79ef2cSGreg Kurz err = -E2BIG; 38493b79ef2cSGreg Kurz goto out_nofid; 38503b79ef2cSGreg Kurz } 38513b79ef2cSGreg Kurz 385260ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 385360ce86c7SWei Liu if (file_fidp == NULL) { 385460ce86c7SWei Liu err = -EINVAL; 385560ce86c7SWei Liu goto out_nofid; 385660ce86c7SWei Liu } 3857dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3858dd654e03SGreg Kurz err = -EINVAL; 3859dd654e03SGreg Kurz goto out_put_fid; 3860dd654e03SGreg Kurz } 3861dd654e03SGreg Kurz 386260ce86c7SWei Liu /* Make the file fid point to xattr */ 386360ce86c7SWei Liu xattr_fidp = file_fidp; 386460ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 386560ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3866dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 386760ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3868aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 386960ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 387060ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3871eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 387260ce86c7SWei Liu err = offset; 3873dd654e03SGreg Kurz out_put_fid: 387460ce86c7SWei Liu put_fid(pdu, file_fidp); 387560ce86c7SWei Liu out_nofid: 387660ce86c7SWei Liu pdu_complete(pdu, err); 387760ce86c7SWei Liu v9fs_string_free(&name); 387860ce86c7SWei Liu } 387960ce86c7SWei Liu 38808440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 388160ce86c7SWei Liu { 388260ce86c7SWei Liu V9fsPDU *pdu = opaque; 388360ce86c7SWei Liu size_t offset = 7; 388460ce86c7SWei Liu V9fsString target; 388560ce86c7SWei Liu int32_t fid; 388660ce86c7SWei Liu int err = 0; 388760ce86c7SWei Liu V9fsFidState *fidp; 388860ce86c7SWei Liu 388960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 389060ce86c7SWei Liu if (err < 0) { 389160ce86c7SWei Liu goto out_nofid; 389260ce86c7SWei Liu } 389360ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 389460ce86c7SWei Liu fidp = get_fid(pdu, fid); 389560ce86c7SWei Liu if (fidp == NULL) { 389660ce86c7SWei Liu err = -ENOENT; 389760ce86c7SWei Liu goto out_nofid; 389860ce86c7SWei Liu } 389960ce86c7SWei Liu 390060ce86c7SWei Liu v9fs_string_init(&target); 390160ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 390260ce86c7SWei Liu if (err < 0) { 390360ce86c7SWei Liu goto out; 390460ce86c7SWei Liu } 390560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 390660ce86c7SWei Liu if (err < 0) { 390760ce86c7SWei Liu v9fs_string_free(&target); 390860ce86c7SWei Liu goto out; 390960ce86c7SWei Liu } 391060ce86c7SWei Liu err += offset; 391160ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 391260ce86c7SWei Liu v9fs_string_free(&target); 391360ce86c7SWei Liu out: 391460ce86c7SWei Liu put_fid(pdu, fidp); 391560ce86c7SWei Liu out_nofid: 391660ce86c7SWei Liu pdu_complete(pdu, err); 391760ce86c7SWei Liu } 391860ce86c7SWei Liu 391960ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 392060ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 392160ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 392260ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 392360ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 392460ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 392560ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 392660ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 392760ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 392860ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 392960ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 393060ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 393160ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 393260ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 393360ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 393460ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 393560ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 393660ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 393760ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 393860ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 393960ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 394060ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 394160ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 394260ce86c7SWei Liu [P9_TREAD] = v9fs_read, 394360ce86c7SWei Liu #if 0 394460ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 394560ce86c7SWei Liu #endif 394660ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 394760ce86c7SWei Liu [P9_TLINK] = v9fs_link, 394860ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 394960ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 395060ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 395160ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 395260ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 395360ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 395460ce86c7SWei Liu }; 395560ce86c7SWei Liu 39568440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 395760ce86c7SWei Liu { 395860ce86c7SWei Liu V9fsPDU *pdu = opaque; 395960ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 396060ce86c7SWei Liu } 396160ce86c7SWei Liu 39628440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 396360ce86c7SWei Liu { 396460ce86c7SWei Liu V9fsPDU *pdu = opaque; 396560ce86c7SWei Liu pdu_complete(pdu, -EROFS); 396660ce86c7SWei Liu } 396760ce86c7SWei Liu 396860ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 396960ce86c7SWei Liu { 397060ce86c7SWei Liu switch (pdu->id) { 397160ce86c7SWei Liu case P9_TREADDIR: 397260ce86c7SWei Liu case P9_TSTATFS: 397360ce86c7SWei Liu case P9_TGETATTR: 397460ce86c7SWei Liu case P9_TXATTRWALK: 397560ce86c7SWei Liu case P9_TLOCK: 397660ce86c7SWei Liu case P9_TGETLOCK: 397760ce86c7SWei Liu case P9_TREADLINK: 397860ce86c7SWei Liu case P9_TVERSION: 397960ce86c7SWei Liu case P9_TLOPEN: 398060ce86c7SWei Liu case P9_TATTACH: 398160ce86c7SWei Liu case P9_TSTAT: 398260ce86c7SWei Liu case P9_TWALK: 398360ce86c7SWei Liu case P9_TCLUNK: 398460ce86c7SWei Liu case P9_TFSYNC: 398560ce86c7SWei Liu case P9_TOPEN: 398660ce86c7SWei Liu case P9_TREAD: 398760ce86c7SWei Liu case P9_TAUTH: 398860ce86c7SWei Liu case P9_TFLUSH: 398960ce86c7SWei Liu return 1; 399060ce86c7SWei Liu default: 399160ce86c7SWei Liu return 0; 399260ce86c7SWei Liu } 399360ce86c7SWei Liu } 399460ce86c7SWei Liu 3995506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 399660ce86c7SWei Liu { 399760ce86c7SWei Liu Coroutine *co; 399860ce86c7SWei Liu CoroutineEntry *handler; 399960ce86c7SWei Liu V9fsState *s = pdu->s; 400060ce86c7SWei Liu 4001506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4002506f3275SGreg Kurz pdu->id = hdr->id; 4003506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4004506f3275SGreg Kurz 400560ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 400660ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 400760ce86c7SWei Liu handler = v9fs_op_not_supp; 4008d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4009d1471233SGreg Kurz handler = v9fs_fs_ro; 401060ce86c7SWei Liu } else { 401160ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 401260ce86c7SWei Liu } 401360ce86c7SWei Liu 4014506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 40150b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 40160b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 401760ce86c7SWei Liu } 401860ce86c7SWei Liu 40192a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4020066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4021066eb006SGreg Kurz Error **errp) 40222a0c56aaSWei Liu { 402392c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 40242a0c56aaSWei Liu int i, len; 40252a0c56aaSWei Liu struct stat stat; 40262a0c56aaSWei Liu FsDriverEntry *fse; 40272a0c56aaSWei Liu V9fsPath path; 40282a0c56aaSWei Liu int rc = 1; 40292a0c56aaSWei Liu 4030066eb006SGreg Kurz assert(!s->transport); 4031066eb006SGreg Kurz s->transport = t; 4032066eb006SGreg Kurz 40332a0c56aaSWei Liu /* initialize pdu allocator */ 40342a0c56aaSWei Liu QLIST_INIT(&s->free_list); 40352a0c56aaSWei Liu QLIST_INIT(&s->active_list); 40360d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4037583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4038583f21f8SStefano Stabellini s->pdus[i].s = s; 4039583f21f8SStefano Stabellini s->pdus[i].idx = i; 40402a0c56aaSWei Liu } 40412a0c56aaSWei Liu 40422a0c56aaSWei Liu v9fs_path_init(&path); 40432a0c56aaSWei Liu 40442a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 40452a0c56aaSWei Liu 40462a0c56aaSWei Liu if (!fse) { 40472a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 40482a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 40492a0c56aaSWei Liu "id = %s", 40502a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 40512a0c56aaSWei Liu goto out; 40522a0c56aaSWei Liu } 40532a0c56aaSWei Liu 40542a0c56aaSWei Liu if (!s->fsconf.tag) { 40552a0c56aaSWei Liu /* we haven't specified a mount_tag */ 40562a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 40572a0c56aaSWei Liu s->fsconf.fsdev_id); 40582a0c56aaSWei Liu goto out; 40592a0c56aaSWei Liu } 40602a0c56aaSWei Liu 40612a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 40622a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 40632a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 40642a0c56aaSWei Liu len = strlen(s->fsconf.tag); 40652a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 40662a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 40672a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 40682a0c56aaSWei Liu goto out; 40692a0c56aaSWei Liu } 40702a0c56aaSWei Liu 40712a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 40722a0c56aaSWei Liu s->ctx.uid = -1; 40732a0c56aaSWei Liu 40742a0c56aaSWei Liu s->ops = fse->ops; 40752a0c56aaSWei Liu 4076b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4077b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4078b96feb2cSTobias Schramm 4079*feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 40802a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 40812a0c56aaSWei Liu 408265603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 408365603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 408465603a80SGreg Kurz s->fsconf.fsdev_id); 40852a0c56aaSWei Liu goto out; 40862a0c56aaSWei Liu } 40872a0c56aaSWei Liu 40882a0c56aaSWei Liu /* 40892a0c56aaSWei Liu * Check details of export path, We need to use fs driver 40902a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 40912a0c56aaSWei Liu * use co-routines here. 40922a0c56aaSWei Liu */ 40932a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 40942a0c56aaSWei Liu error_setg(errp, 40952a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 40962a0c56aaSWei Liu goto out; 40972a0c56aaSWei Liu } 40982a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 40992a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41002a0c56aaSWei Liu goto out; 41012a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41022a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41032a0c56aaSWei Liu goto out; 41042a0c56aaSWei Liu } 4105b8bbdb88SPradeep Jagadeesh 41063b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41073b5ee9e8SAntonios Motakis 41086b6aa828SChristian Schoenebeck /* init inode remapping : */ 41096b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 41106b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 41116b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 41126b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 41136b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 41141a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 41156b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 41166b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4117f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 41181a6ed33cSAntonios Motakis 4119b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4120b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4121b8bbdb88SPradeep Jagadeesh 41222a0c56aaSWei Liu rc = 0; 41232a0c56aaSWei Liu out: 41242a0c56aaSWei Liu if (rc) { 4125b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4126702dbcc2SLi Qiang } 41272a0c56aaSWei Liu v9fs_path_free(&path); 41282a0c56aaSWei Liu return rc; 41292a0c56aaSWei Liu } 41302a0c56aaSWei Liu 4131b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 41322a0c56aaSWei Liu { 4133c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4134702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4135702dbcc2SLi Qiang } 4136c0da0cb7SGreg Kurz if (s->ctx.fst) { 4137b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4138c0da0cb7SGreg Kurz } 41392a0c56aaSWei Liu g_free(s->tag); 41406b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4141f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4142f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 41434774718eSLi Qiang g_free(s->ctx.fs_root); 41442a0c56aaSWei Liu } 41452a0c56aaSWei Liu 41460e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 41470e44a0fdSGreg Kurz V9fsPDU pdu; 41480e44a0fdSGreg Kurz bool done; 41490e44a0fdSGreg Kurz } VirtfsCoResetData; 41500e44a0fdSGreg Kurz 41510e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 41520e44a0fdSGreg Kurz { 41530e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 41540e44a0fdSGreg Kurz 41550e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 41560e44a0fdSGreg Kurz data->done = true; 41570e44a0fdSGreg Kurz } 41580e44a0fdSGreg Kurz 41590e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 41600e44a0fdSGreg Kurz { 41610e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 41620e44a0fdSGreg Kurz Coroutine *co; 41630e44a0fdSGreg Kurz 41640e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 41650e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41660e44a0fdSGreg Kurz } 41670e44a0fdSGreg Kurz 41680e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 41690e44a0fdSGreg Kurz qemu_coroutine_enter(co); 41700e44a0fdSGreg Kurz 41710e44a0fdSGreg Kurz while (!data.done) { 41720e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41730e44a0fdSGreg Kurz } 41740e44a0fdSGreg Kurz } 41750e44a0fdSGreg Kurz 417660ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 417760ce86c7SWei Liu { 417860ce86c7SWei Liu struct rlimit rlim; 417960ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 418063325b18SGreg Kurz error_report("Failed to get the resource limit"); 418160ce86c7SWei Liu exit(1); 418260ce86c7SWei Liu } 418360ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 418460ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 418560ce86c7SWei Liu } 4186