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> 3160ce86c7SWei Liu 3260ce86c7SWei Liu int open_fd_hw; 3360ce86c7SWei Liu int total_open_fd; 3460ce86c7SWei Liu static int open_fd_rc; 3560ce86c7SWei Liu 3660ce86c7SWei Liu enum { 3760ce86c7SWei Liu Oread = 0x00, 3860ce86c7SWei Liu Owrite = 0x01, 3960ce86c7SWei Liu Ordwr = 0x02, 4060ce86c7SWei Liu Oexec = 0x03, 4160ce86c7SWei Liu Oexcl = 0x04, 4260ce86c7SWei Liu Otrunc = 0x10, 4360ce86c7SWei Liu Orexec = 0x20, 4460ce86c7SWei Liu Orclose = 0x40, 4560ce86c7SWei Liu Oappend = 0x80, 4660ce86c7SWei Liu }; 4760ce86c7SWei Liu 4875673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 4960ce86c7SWei Liu { 5060ce86c7SWei Liu ssize_t ret; 5160ce86c7SWei Liu va_list ap; 5260ce86c7SWei Liu 5360ce86c7SWei Liu va_start(ap, fmt); 54ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 5560ce86c7SWei Liu va_end(ap); 5660ce86c7SWei Liu 5760ce86c7SWei Liu return ret; 5860ce86c7SWei Liu } 5960ce86c7SWei Liu 6075673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 6160ce86c7SWei Liu { 6260ce86c7SWei Liu ssize_t ret; 6360ce86c7SWei Liu va_list ap; 6460ce86c7SWei Liu 6560ce86c7SWei Liu va_start(ap, fmt); 66ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 6760ce86c7SWei Liu va_end(ap); 6860ce86c7SWei Liu 6960ce86c7SWei Liu return ret; 7060ce86c7SWei Liu } 7160ce86c7SWei Liu 7260ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 7360ce86c7SWei Liu { 7460ce86c7SWei Liu int ret = 0; 7560ce86c7SWei Liu 7660ce86c7SWei Liu switch (mode & 3) { 7760ce86c7SWei Liu case Oread: 7860ce86c7SWei Liu ret = O_RDONLY; 7960ce86c7SWei Liu break; 8060ce86c7SWei Liu case Ordwr: 8160ce86c7SWei Liu ret = O_RDWR; 8260ce86c7SWei Liu break; 8360ce86c7SWei Liu case Owrite: 8460ce86c7SWei Liu ret = O_WRONLY; 8560ce86c7SWei Liu break; 8660ce86c7SWei Liu case Oexec: 8760ce86c7SWei Liu ret = O_RDONLY; 8860ce86c7SWei Liu break; 8960ce86c7SWei Liu } 9060ce86c7SWei Liu 9160ce86c7SWei Liu if (mode & Otrunc) { 9260ce86c7SWei Liu ret |= O_TRUNC; 9360ce86c7SWei Liu } 9460ce86c7SWei Liu 9560ce86c7SWei Liu if (mode & Oappend) { 9660ce86c7SWei Liu ret |= O_APPEND; 9760ce86c7SWei Liu } 9860ce86c7SWei Liu 9960ce86c7SWei Liu if (mode & Oexcl) { 10060ce86c7SWei Liu ret |= O_EXCL; 10160ce86c7SWei Liu } 10260ce86c7SWei Liu 10360ce86c7SWei Liu return ret; 10460ce86c7SWei Liu } 10560ce86c7SWei Liu 1068e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 10760ce86c7SWei Liu int dotl_flag; 10860ce86c7SWei Liu int open_flag; 1098e71b96cSGreg Kurz } DotlOpenflagMap; 11060ce86c7SWei Liu 11160ce86c7SWei Liu static int dotl_to_open_flags(int flags) 11260ce86c7SWei Liu { 11360ce86c7SWei Liu int i; 11460ce86c7SWei Liu /* 11560ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 11660ce86c7SWei Liu * and P9_DOTL_NOACCESS 11760ce86c7SWei Liu */ 11860ce86c7SWei Liu int oflags = flags & O_ACCMODE; 11960ce86c7SWei Liu 1208e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 12160ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 12260ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 12360ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 12460ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 12560ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 12660ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 12760ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 12860ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 12960ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 13060ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 13160ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 13260ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 13360ce86c7SWei Liu { P9_DOTL_NOATIME, O_NOATIME }, 13460ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 13560ce86c7SWei Liu }; 13660ce86c7SWei Liu 13760ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 13860ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 13960ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 14060ce86c7SWei Liu } 14160ce86c7SWei Liu } 14260ce86c7SWei Liu 14360ce86c7SWei Liu return oflags; 14460ce86c7SWei Liu } 14560ce86c7SWei Liu 14660ce86c7SWei Liu void cred_init(FsCred *credp) 14760ce86c7SWei Liu { 14860ce86c7SWei Liu credp->fc_uid = -1; 14960ce86c7SWei Liu credp->fc_gid = -1; 15060ce86c7SWei Liu credp->fc_mode = -1; 15160ce86c7SWei Liu credp->fc_rdev = -1; 15260ce86c7SWei Liu } 15360ce86c7SWei Liu 15460ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 15560ce86c7SWei Liu { 15660ce86c7SWei Liu int flags; 15760ce86c7SWei Liu /* 15860ce86c7SWei Liu * Filter the client open flags 15960ce86c7SWei Liu */ 16060ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 16160ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 16260ce86c7SWei Liu /* 16360ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 16460ce86c7SWei Liu */ 16560ce86c7SWei Liu flags &= ~O_DIRECT; 16660ce86c7SWei Liu return flags; 16760ce86c7SWei Liu } 16860ce86c7SWei Liu 16960ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 17060ce86c7SWei Liu { 17160ce86c7SWei Liu path->data = NULL; 17260ce86c7SWei Liu path->size = 0; 17360ce86c7SWei Liu } 17460ce86c7SWei Liu 17560ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 17660ce86c7SWei Liu { 17760ce86c7SWei Liu g_free(path->data); 17860ce86c7SWei Liu path->data = NULL; 17960ce86c7SWei Liu path->size = 0; 18060ce86c7SWei Liu } 18160ce86c7SWei Liu 182e3e83f2eSGreg Kurz 183e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 184e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 185e3e83f2eSGreg Kurz { 186e3e83f2eSGreg Kurz va_list ap; 187e3e83f2eSGreg Kurz 188e3e83f2eSGreg Kurz v9fs_path_free(path); 189e3e83f2eSGreg Kurz 190e3e83f2eSGreg Kurz va_start(ap, fmt); 191e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 192e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 193e3e83f2eSGreg Kurz va_end(ap); 194e3e83f2eSGreg Kurz } 195e3e83f2eSGreg Kurz 196e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 19760ce86c7SWei Liu { 198e446a1ebSMarc-André Lureau v9fs_path_free(dst); 199e446a1ebSMarc-André Lureau dst->size = src->size; 200e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 20160ce86c7SWei Liu } 20260ce86c7SWei Liu 20360ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 20460ce86c7SWei Liu const char *name, V9fsPath *path) 20560ce86c7SWei Liu { 20660ce86c7SWei Liu int err; 20760ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 20860ce86c7SWei Liu if (err < 0) { 20960ce86c7SWei Liu err = -errno; 21060ce86c7SWei Liu } 21160ce86c7SWei Liu return err; 21260ce86c7SWei Liu } 21360ce86c7SWei Liu 21460ce86c7SWei Liu /* 21560ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 21660ce86c7SWei Liu * 21760ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 21860ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 21960ce86c7SWei Liu */ 22060ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 22160ce86c7SWei Liu { 22260ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 22360ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 22460ce86c7SWei Liu return 1; 22560ce86c7SWei Liu } 22660ce86c7SWei Liu } 22760ce86c7SWei Liu return 0; 22860ce86c7SWei Liu } 22960ce86c7SWei Liu 23060ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 23160ce86c7SWei Liu { 23260ce86c7SWei Liu return str->size; 23360ce86c7SWei Liu } 23460ce86c7SWei Liu 23560ce86c7SWei Liu /* 23660ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2378440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 23860ce86c7SWei Liu { 23960ce86c7SWei Liu int err = 1; 24060ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 24160ce86c7SWei Liu if (f->fs.fd == -1) { 24260ce86c7SWei Liu do { 24360ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 24460ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 24560ce86c7SWei Liu } 24660ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 247f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 24860ce86c7SWei Liu do { 24960ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 25060ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25160ce86c7SWei Liu } 25260ce86c7SWei Liu } 25360ce86c7SWei Liu return err; 25460ce86c7SWei Liu } 25560ce86c7SWei Liu 2568440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 25760ce86c7SWei Liu { 25860ce86c7SWei Liu int err; 25960ce86c7SWei Liu V9fsFidState *f; 26060ce86c7SWei Liu V9fsState *s = pdu->s; 26160ce86c7SWei Liu 26260ce86c7SWei Liu for (f = s->fid_list; f; f = f->next) { 26360ce86c7SWei Liu BUG_ON(f->clunked); 26460ce86c7SWei Liu if (f->fid == fid) { 26560ce86c7SWei Liu /* 26660ce86c7SWei Liu * Update the fid ref upfront so that 26760ce86c7SWei Liu * we don't get reclaimed when we yield 26860ce86c7SWei Liu * in open later. 26960ce86c7SWei Liu */ 27060ce86c7SWei Liu f->ref++; 27160ce86c7SWei Liu /* 27260ce86c7SWei Liu * check whether we need to reopen the 27360ce86c7SWei Liu * file. We might have closed the fd 27460ce86c7SWei Liu * while trying to free up some file 27560ce86c7SWei Liu * descriptors. 27660ce86c7SWei Liu */ 27760ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 27860ce86c7SWei Liu if (err < 0) { 27960ce86c7SWei Liu f->ref--; 28060ce86c7SWei Liu return NULL; 28160ce86c7SWei Liu } 28260ce86c7SWei Liu /* 28360ce86c7SWei Liu * Mark the fid as referenced so that the LRU 28460ce86c7SWei Liu * reclaim won't close the file descriptor 28560ce86c7SWei Liu */ 28660ce86c7SWei Liu f->flags |= FID_REFERENCED; 28760ce86c7SWei Liu return f; 28860ce86c7SWei Liu } 28960ce86c7SWei Liu } 29060ce86c7SWei Liu return NULL; 29160ce86c7SWei Liu } 29260ce86c7SWei Liu 29360ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 29460ce86c7SWei Liu { 29560ce86c7SWei Liu V9fsFidState *f; 29660ce86c7SWei Liu 29760ce86c7SWei Liu for (f = s->fid_list; f; f = f->next) { 29860ce86c7SWei Liu /* If fid is already there return NULL */ 29960ce86c7SWei Liu BUG_ON(f->clunked); 30060ce86c7SWei Liu if (f->fid == fid) { 30160ce86c7SWei Liu return NULL; 30260ce86c7SWei Liu } 30360ce86c7SWei Liu } 30460ce86c7SWei Liu f = g_malloc0(sizeof(V9fsFidState)); 30560ce86c7SWei Liu f->fid = fid; 30660ce86c7SWei Liu f->fid_type = P9_FID_NONE; 30760ce86c7SWei Liu f->ref = 1; 30860ce86c7SWei Liu /* 30960ce86c7SWei Liu * Mark the fid as referenced so that the LRU 31060ce86c7SWei Liu * reclaim won't close the file descriptor 31160ce86c7SWei Liu */ 31260ce86c7SWei Liu f->flags |= FID_REFERENCED; 31360ce86c7SWei Liu f->next = s->fid_list; 31460ce86c7SWei Liu s->fid_list = f; 31560ce86c7SWei Liu 3167cde47d4SGreg Kurz v9fs_readdir_init(&f->fs.dir); 3177cde47d4SGreg Kurz v9fs_readdir_init(&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 { 40360ce86c7SWei Liu V9fsFidState **fidpp, *fidp; 40460ce86c7SWei Liu 40560ce86c7SWei Liu for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { 40660ce86c7SWei Liu if ((*fidpp)->fid == fid) { 40760ce86c7SWei Liu break; 40860ce86c7SWei Liu } 40960ce86c7SWei Liu } 41060ce86c7SWei Liu if (*fidpp == NULL) { 41160ce86c7SWei Liu return NULL; 41260ce86c7SWei Liu } 41360ce86c7SWei Liu fidp = *fidpp; 41460ce86c7SWei Liu *fidpp = fidp->next; 41560ce86c7SWei Liu fidp->clunked = 1; 41660ce86c7SWei Liu return fidp; 41760ce86c7SWei Liu } 41860ce86c7SWei Liu 4198440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 42060ce86c7SWei Liu { 42160ce86c7SWei Liu int reclaim_count = 0; 42260ce86c7SWei Liu V9fsState *s = pdu->s; 42360ce86c7SWei Liu V9fsFidState *f, *reclaim_list = NULL; 42460ce86c7SWei Liu 42560ce86c7SWei Liu for (f = s->fid_list; f; f = f->next) { 42660ce86c7SWei Liu /* 42760ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 42860ce86c7SWei Liu * for them and skip them. Also skip fids 42960ce86c7SWei Liu * currently being operated on. 43060ce86c7SWei Liu */ 43160ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 43260ce86c7SWei Liu continue; 43360ce86c7SWei Liu } 43460ce86c7SWei Liu /* 43560ce86c7SWei Liu * if it is a recently referenced fid 43660ce86c7SWei Liu * we leave the fid untouched and clear the 43760ce86c7SWei Liu * reference bit. We come back to it later 43860ce86c7SWei Liu * in the next iteration. (a simple LRU without 43960ce86c7SWei Liu * moving list elements around) 44060ce86c7SWei Liu */ 44160ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 44260ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 44360ce86c7SWei Liu continue; 44460ce86c7SWei Liu } 44560ce86c7SWei Liu /* 44660ce86c7SWei Liu * Add fids to reclaim list. 44760ce86c7SWei Liu */ 44860ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 44960ce86c7SWei Liu if (f->fs.fd != -1) { 45060ce86c7SWei Liu /* 45160ce86c7SWei Liu * Up the reference count so that 45260ce86c7SWei Liu * a clunk request won't free this fid 45360ce86c7SWei Liu */ 45460ce86c7SWei Liu f->ref++; 45560ce86c7SWei Liu f->rclm_lst = reclaim_list; 45660ce86c7SWei Liu reclaim_list = f; 45760ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 45860ce86c7SWei Liu f->fs.fd = -1; 45960ce86c7SWei Liu reclaim_count++; 46060ce86c7SWei Liu } 46160ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 462f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 46360ce86c7SWei Liu /* 46460ce86c7SWei Liu * Up the reference count so that 46560ce86c7SWei Liu * a clunk request won't free this fid 46660ce86c7SWei Liu */ 46760ce86c7SWei Liu f->ref++; 46860ce86c7SWei Liu f->rclm_lst = reclaim_list; 46960ce86c7SWei Liu reclaim_list = f; 470f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 471f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 47260ce86c7SWei Liu reclaim_count++; 47360ce86c7SWei Liu } 47460ce86c7SWei Liu } 47560ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 47660ce86c7SWei Liu break; 47760ce86c7SWei Liu } 47860ce86c7SWei Liu } 47960ce86c7SWei Liu /* 48060ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 48160ce86c7SWei Liu * are already clunked. 48260ce86c7SWei Liu */ 48360ce86c7SWei Liu while (reclaim_list) { 48460ce86c7SWei Liu f = reclaim_list; 48560ce86c7SWei Liu reclaim_list = f->rclm_lst; 48660ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 48760ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 48860ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 48960ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 49060ce86c7SWei Liu } 49160ce86c7SWei Liu f->rclm_lst = NULL; 49260ce86c7SWei Liu /* 49360ce86c7SWei Liu * Now drop the fid reference, free it 49460ce86c7SWei Liu * if clunked. 49560ce86c7SWei Liu */ 49660ce86c7SWei Liu put_fid(pdu, f); 49760ce86c7SWei Liu } 49860ce86c7SWei Liu } 49960ce86c7SWei Liu 5008440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 50160ce86c7SWei Liu { 50260ce86c7SWei Liu int err; 50360ce86c7SWei Liu V9fsState *s = pdu->s; 50460ce86c7SWei Liu V9fsFidState *fidp, head_fid; 50560ce86c7SWei Liu 50660ce86c7SWei Liu head_fid.next = s->fid_list; 50760ce86c7SWei Liu for (fidp = s->fid_list; fidp; fidp = fidp->next) { 50860ce86c7SWei Liu if (fidp->path.size != path->size) { 50960ce86c7SWei Liu continue; 51060ce86c7SWei Liu } 51160ce86c7SWei Liu if (!memcmp(fidp->path.data, path->data, path->size)) { 51260ce86c7SWei Liu /* Mark the fid non reclaimable. */ 51360ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 51460ce86c7SWei Liu 51560ce86c7SWei Liu /* reopen the file/dir if already closed */ 51660ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 51760ce86c7SWei Liu if (err < 0) { 518267fcadfSGreg Kurz return err; 51960ce86c7SWei Liu } 52060ce86c7SWei Liu /* 52160ce86c7SWei Liu * Go back to head of fid list because 52260ce86c7SWei Liu * the list could have got updated when 52360ce86c7SWei Liu * switched to the worker thread 52460ce86c7SWei Liu */ 52560ce86c7SWei Liu if (err == 0) { 52660ce86c7SWei Liu fidp = &head_fid; 52760ce86c7SWei Liu } 52860ce86c7SWei Liu } 52960ce86c7SWei Liu } 53060ce86c7SWei Liu return 0; 53160ce86c7SWei Liu } 53260ce86c7SWei Liu 5338440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 53460ce86c7SWei Liu { 53560ce86c7SWei Liu V9fsState *s = pdu->s; 53679decce3SGreg Kurz V9fsFidState *fidp; 53760ce86c7SWei Liu 53860ce86c7SWei Liu /* Free all fids */ 53960ce86c7SWei Liu while (s->fid_list) { 5406d54af0eSGreg Kurz /* Get fid */ 54160ce86c7SWei Liu fidp = s->fid_list; 5426d54af0eSGreg Kurz fidp->ref++; 54360ce86c7SWei Liu 5446d54af0eSGreg Kurz /* Clunk fid */ 5456d54af0eSGreg Kurz s->fid_list = fidp->next; 54660ce86c7SWei Liu fidp->clunked = 1; 5476d54af0eSGreg Kurz 5486d54af0eSGreg Kurz put_fid(pdu, fidp); 54960ce86c7SWei Liu } 55060ce86c7SWei Liu } 55160ce86c7SWei Liu 55260ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 55360ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 55460ce86c7SWei Liu 55560ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 55660ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 55760ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 55860ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 55960ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 56060ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 56160ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 56260ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 56360ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 56460ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 56560ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 56660ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 56760ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 56860ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 56960ce86c7SWei Liu 57060ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 57160ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 57260ce86c7SWei Liu P9_STAT_MODE_LINK | \ 57360ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 57460ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 57560ce86c7SWei Liu P9_STAT_MODE_SOCKET) 57660ce86c7SWei Liu 5776b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 5786b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 5796b6aa828SChristian Schoenebeck { 5806b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 5816b6aa828SChristian Schoenebeck } 5826b6aa828SChristian Schoenebeck 5836b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 5846b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 5856b6aa828SChristian Schoenebeck { 5866b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 5876b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 5886b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 5896b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 5906b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 5916b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 5926b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 5936b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 5946b6aa828SChristian Schoenebeck } 5956b6aa828SChristian Schoenebeck 5966b6aa828SChristian Schoenebeck /** 5976b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 5986b6aa828SChristian Schoenebeck * 5996b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6006b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6016b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6026b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6036b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6046b6aa828SChristian Schoenebeck * 6056b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6066b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6076b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6086b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6096b6aa828SChristian Schoenebeck * 6106b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6116b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6126b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6136b6aa828SChristian Schoenebeck */ 6146b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6156b6aa828SChristian Schoenebeck 6166b6aa828SChristian Schoenebeck /** 6176b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6186b6aa828SChristian Schoenebeck * 6196b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6206b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6216b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6226b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6236b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6246b6aa828SChristian Schoenebeck * 6256b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6266b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6276b6aa828SChristian Schoenebeck * 6286b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6296b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6306b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6316b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6326b6aa828SChristian Schoenebeck */ 6336b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6346b6aa828SChristian Schoenebeck { 6356b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6366b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6376b6aa828SChristian Schoenebeck return (VariLenAffix) { 6386b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6396b6aa828SChristian Schoenebeck .value = value, 6406b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6416b6aa828SChristian Schoenebeck }; 6426b6aa828SChristian Schoenebeck } 6436b6aa828SChristian Schoenebeck 6446b6aa828SChristian Schoenebeck /** 6456b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6466b6aa828SChristian Schoenebeck * 6476b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6486b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6496b6aa828SChristian Schoenebeck * after the conversion. 6506b6aa828SChristian Schoenebeck * 6516b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6526b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6536b6aa828SChristian Schoenebeck * versa). 6546b6aa828SChristian Schoenebeck */ 6556b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6566b6aa828SChristian Schoenebeck { 6576b6aa828SChristian Schoenebeck return (VariLenAffix) { 6586b6aa828SChristian Schoenebeck .type = 6596b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6606b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6616b6aa828SChristian Schoenebeck .value = 6626b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6636b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6646b6aa828SChristian Schoenebeck .bits = affix->bits 6656b6aa828SChristian Schoenebeck }; 6666b6aa828SChristian Schoenebeck } 6676b6aa828SChristian Schoenebeck 6686b6aa828SChristian Schoenebeck /** 6696b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6706b6aa828SChristian Schoenebeck * 6716b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6726b6aa828SChristian Schoenebeck * 6736b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6746b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6756b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 6766b6aa828SChristian Schoenebeck * 6776b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 6786b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6796b6aa828SChristian Schoenebeck */ 6806b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 6816b6aa828SChristian Schoenebeck { 6826b6aa828SChristian Schoenebeck VariLenAffix prefix; 6836b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 6846b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 6856b6aa828SChristian Schoenebeck } 6866b6aa828SChristian Schoenebeck 6871a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 6881a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 6891a6ed33cSAntonios Motakis { 6901a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 6911a6ed33cSAntonios Motakis } 6921a6ed33cSAntonios Motakis 693f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 694f3fe4a2dSAntonios Motakis { 695f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 696f3fe4a2dSAntonios Motakis } 697f3fe4a2dSAntonios Motakis 6986b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 6996b6aa828SChristian Schoenebeck { 7006b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7016b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7026b6aa828SChristian Schoenebeck } 7036b6aa828SChristian Schoenebeck 7046b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7051a6ed33cSAntonios Motakis { 7061a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7071a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7081a6ed33cSAntonios Motakis } 7091a6ed33cSAntonios Motakis 7106b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 711f3fe4a2dSAntonios Motakis { 712f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 713f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 714f3fe4a2dSAntonios Motakis } 715f3fe4a2dSAntonios Motakis 716f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7171a6ed33cSAntonios Motakis { 7181a6ed33cSAntonios Motakis g_free(p); 7191a6ed33cSAntonios Motakis } 7201a6ed33cSAntonios Motakis 721f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7221a6ed33cSAntonios Motakis { 7231a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7241a6ed33cSAntonios Motakis return; 7251a6ed33cSAntonios Motakis } 726f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7271a6ed33cSAntonios Motakis qht_destroy(ht); 7281a6ed33cSAntonios Motakis } 7291a6ed33cSAntonios Motakis 7306b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7316b6aa828SChristian Schoenebeck { 7326b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7336b6aa828SChristian Schoenebeck } 7346b6aa828SChristian Schoenebeck 7351a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7361a6ed33cSAntonios Motakis { 7376b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7381a6ed33cSAntonios Motakis } 7391a6ed33cSAntonios Motakis 740f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 741f3fe4a2dSAntonios Motakis { 7426b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 743f3fe4a2dSAntonios Motakis } 744f3fe4a2dSAntonios Motakis 7456b6aa828SChristian Schoenebeck /* 7466b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7476b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7486b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7496b6aa828SChristian Schoenebeck * 7506b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7516b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7526b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7536b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7546b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7556b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7566b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7576b6aa828SChristian Schoenebeck */ 7586b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7596b6aa828SChristian Schoenebeck { 7606b6aa828SChristian Schoenebeck QpdEntry lookup = { 7616b6aa828SChristian Schoenebeck .dev = dev 7626b6aa828SChristian Schoenebeck }, *val; 7636b6aa828SChristian Schoenebeck uint32_t hash = dev; 7646b6aa828SChristian Schoenebeck VariLenAffix affix; 7656b6aa828SChristian Schoenebeck 7666b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7676b6aa828SChristian Schoenebeck if (!val) { 7686b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7696b6aa828SChristian Schoenebeck *val = lookup; 7706b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7716b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7726b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7736b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7746b6aa828SChristian Schoenebeck } 7756b6aa828SChristian Schoenebeck return val->prefix_bits; 7766b6aa828SChristian Schoenebeck } 7776b6aa828SChristian Schoenebeck 7786b6aa828SChristian Schoenebeck /** 7796b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 7806b6aa828SChristian Schoenebeck * 7816b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 7826b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 7836b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 7846b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 7856b6aa828SChristian Schoenebeck * guest. 7866b6aa828SChristian Schoenebeck * 7876b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 7886b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 7896b6aa828SChristian Schoenebeck * expected ever to be used at all though. 7906b6aa828SChristian Schoenebeck * 7916b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 7926b6aa828SChristian Schoenebeck * 7936b6aa828SChristian Schoenebeck */ 794f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 795f3fe4a2dSAntonios Motakis uint64_t *path) 796f3fe4a2dSAntonios Motakis { 797f3fe4a2dSAntonios Motakis QpfEntry lookup = { 798f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 799f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 800f3fe4a2dSAntonios Motakis }, *val; 801f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8026b6aa828SChristian Schoenebeck VariLenAffix affix; 803f3fe4a2dSAntonios Motakis 804f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 805f3fe4a2dSAntonios Motakis 806f3fe4a2dSAntonios Motakis if (!val) { 807f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 808f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 809f3fe4a2dSAntonios Motakis error_report_once( 810f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 811f3fe4a2dSAntonios Motakis "host to guest." 812f3fe4a2dSAntonios Motakis ); 813f3fe4a2dSAntonios Motakis return -ENFILE; 814f3fe4a2dSAntonios Motakis } 815f3fe4a2dSAntonios Motakis 816f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 817f3fe4a2dSAntonios Motakis *val = lookup; 818f3fe4a2dSAntonios Motakis 819f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8206b6aa828SChristian Schoenebeck affix = affixForIndex( 8216b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8226b6aa828SChristian Schoenebeck ); 8236b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8246b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 825f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 826f3fe4a2dSAntonios Motakis } 827f3fe4a2dSAntonios Motakis 828f3fe4a2dSAntonios Motakis *path = val->path; 829f3fe4a2dSAntonios Motakis return 0; 830f3fe4a2dSAntonios Motakis } 831f3fe4a2dSAntonios Motakis 8326b6aa828SChristian Schoenebeck /** 8336b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8341a6ed33cSAntonios Motakis * 8356b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8366b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8376b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8386b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8396b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8406b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8416b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8426b6aa828SChristian Schoenebeck * that is). 8436b6aa828SChristian Schoenebeck * 8446b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8456b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8466b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8476b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8486b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8496b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8506b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8516b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8526b6aa828SChristian Schoenebeck * 8536b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8546b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8556b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8566b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8576b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8586b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8596b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8606b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8616b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8626b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8636b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8646b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8656b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8666b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8676b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8686b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8696b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8701a6ed33cSAntonios Motakis */ 8716b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8721a6ed33cSAntonios Motakis uint64_t *path) 8731a6ed33cSAntonios Motakis { 8746b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8751a6ed33cSAntonios Motakis QppEntry lookup = { 8761a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 8776b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 8781a6ed33cSAntonios Motakis }, *val; 8791a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 8801a6ed33cSAntonios Motakis 8811a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 8821a6ed33cSAntonios Motakis 8831a6ed33cSAntonios Motakis if (!val) { 8846b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 8856b6aa828SChristian Schoenebeck /* we ran out of affixes */ 886f3fe4a2dSAntonios Motakis warn_report_once( 887f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 8881a6ed33cSAntonios Motakis ); 8891a6ed33cSAntonios Motakis return -ENFILE; 8901a6ed33cSAntonios Motakis } 8911a6ed33cSAntonios Motakis 8921a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 8931a6ed33cSAntonios Motakis *val = lookup; 8941a6ed33cSAntonios Motakis 8956b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 8966b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 8976b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 8981a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 8991a6ed33cSAntonios Motakis } 9006b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9016b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9021a6ed33cSAntonios Motakis return 0; 9031a6ed33cSAntonios Motakis } 9041a6ed33cSAntonios Motakis 9053b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 90660ce86c7SWei Liu { 9071a6ed33cSAntonios Motakis int err; 90860ce86c7SWei Liu size_t size; 90960ce86c7SWei Liu 9101a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9111a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9126b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 913f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 914f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 915f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 916f3fe4a2dSAntonios Motakis } 9171a6ed33cSAntonios Motakis if (err) { 9181a6ed33cSAntonios Motakis return err; 9191a6ed33cSAntonios Motakis } 9201a6ed33cSAntonios Motakis } else { 9213b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9221a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9231a6ed33cSAntonios Motakis error_report_once( 9241a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9251a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9261a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9271a6ed33cSAntonios Motakis "effective." 9281a6ed33cSAntonios Motakis ); 9291a6ed33cSAntonios Motakis return -ENODEV; 9301a6ed33cSAntonios Motakis } else { 9313b5ee9e8SAntonios Motakis warn_report_once( 9323b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9333b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9341a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9351a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9361a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9373b5ee9e8SAntonios Motakis ); 9383b5ee9e8SAntonios Motakis } 9391a6ed33cSAntonios Motakis } 94060ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 94160ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 94260ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9431a6ed33cSAntonios Motakis } 9441a6ed33cSAntonios Motakis 94560ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 94660ce86c7SWei Liu qidp->type = 0; 94760ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 94860ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 94960ce86c7SWei Liu } 95060ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 95160ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 95260ce86c7SWei Liu } 9533b5ee9e8SAntonios Motakis 9543b5ee9e8SAntonios Motakis return 0; 95560ce86c7SWei Liu } 95660ce86c7SWei Liu 9578440e22eSGreg Kurz static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, 9588440e22eSGreg Kurz V9fsQID *qidp) 95960ce86c7SWei Liu { 96060ce86c7SWei Liu struct stat stbuf; 96160ce86c7SWei Liu int err; 96260ce86c7SWei Liu 96360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 96460ce86c7SWei Liu if (err < 0) { 96560ce86c7SWei Liu return err; 96660ce86c7SWei Liu } 9673b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, qidp); 9683b5ee9e8SAntonios Motakis if (err < 0) { 9693b5ee9e8SAntonios Motakis return err; 9703b5ee9e8SAntonios Motakis } 97160ce86c7SWei Liu return 0; 97260ce86c7SWei Liu } 97360ce86c7SWei Liu 9741a6ed33cSAntonios Motakis static int coroutine_fn dirent_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, 9751a6ed33cSAntonios Motakis struct dirent *dent, V9fsQID *qidp) 9761a6ed33cSAntonios Motakis { 9771a6ed33cSAntonios Motakis struct stat stbuf; 9781a6ed33cSAntonios Motakis V9fsPath path; 9791a6ed33cSAntonios Motakis int err; 9801a6ed33cSAntonios Motakis 9811a6ed33cSAntonios Motakis v9fs_path_init(&path); 9821a6ed33cSAntonios Motakis 9831a6ed33cSAntonios Motakis err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 9841a6ed33cSAntonios Motakis if (err < 0) { 9851a6ed33cSAntonios Motakis goto out; 9861a6ed33cSAntonios Motakis } 9871a6ed33cSAntonios Motakis err = v9fs_co_lstat(pdu, &path, &stbuf); 9881a6ed33cSAntonios Motakis if (err < 0) { 9891a6ed33cSAntonios Motakis goto out; 9901a6ed33cSAntonios Motakis } 9911a6ed33cSAntonios Motakis err = stat_to_qid(pdu, &stbuf, qidp); 9921a6ed33cSAntonios Motakis 9931a6ed33cSAntonios Motakis out: 9941a6ed33cSAntonios Motakis v9fs_path_free(&path); 9951a6ed33cSAntonios Motakis return err; 9961a6ed33cSAntonios Motakis } 9971a6ed33cSAntonios Motakis 99860ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 99960ce86c7SWei Liu { 100060ce86c7SWei Liu V9fsPDU *pdu = NULL; 100160ce86c7SWei Liu 100260ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 100360ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 100460ce86c7SWei Liu QLIST_REMOVE(pdu, next); 100560ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 100660ce86c7SWei Liu } 100760ce86c7SWei Liu return pdu; 100860ce86c7SWei Liu } 100960ce86c7SWei Liu 101060ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 101160ce86c7SWei Liu { 101260ce86c7SWei Liu V9fsState *s = pdu->s; 1013f74e27bfSGreg Kurz 1014f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 101560ce86c7SWei Liu QLIST_REMOVE(pdu, next); 101660ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 101760ce86c7SWei Liu } 101860ce86c7SWei Liu 10198440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 102060ce86c7SWei Liu { 102160ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 102260ce86c7SWei Liu V9fsState *s = pdu->s; 102306a37db7SGreg Kurz int ret; 102460ce86c7SWei Liu 1025fc78d5eeSKeno Fischer /* 1026fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1027fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1028fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1029fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1030fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1031fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1032fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1033fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1034fc78d5eeSKeno Fischer * transmission of the reply. 1035fc78d5eeSKeno Fischer */ 1036fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1037fc78d5eeSKeno Fischer if (discard) { 1038fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1039fc78d5eeSKeno Fischer pdu->size = 0; 1040fc78d5eeSKeno Fischer goto out_notify; 1041fc78d5eeSKeno Fischer } 1042fc78d5eeSKeno Fischer 104360ce86c7SWei Liu if (len < 0) { 104460ce86c7SWei Liu int err = -len; 104560ce86c7SWei Liu len = 7; 104660ce86c7SWei Liu 104760ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 104860ce86c7SWei Liu V9fsString str; 104960ce86c7SWei Liu 105060ce86c7SWei Liu str.data = strerror(err); 105160ce86c7SWei Liu str.size = strlen(str.data); 105260ce86c7SWei Liu 105306a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 105406a37db7SGreg Kurz if (ret < 0) { 105506a37db7SGreg Kurz goto out_notify; 105606a37db7SGreg Kurz } 105706a37db7SGreg Kurz len += ret; 105860ce86c7SWei Liu id = P9_RERROR; 105960ce86c7SWei Liu } 106060ce86c7SWei Liu 106106a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 106206a37db7SGreg Kurz if (ret < 0) { 106306a37db7SGreg Kurz goto out_notify; 106406a37db7SGreg Kurz } 106506a37db7SGreg Kurz len += ret; 106660ce86c7SWei Liu 106760ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 106860ce86c7SWei Liu id = P9_RLERROR; 106960ce86c7SWei Liu } 107060ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 107160ce86c7SWei Liu } 107260ce86c7SWei Liu 107360ce86c7SWei Liu /* fill out the header */ 107406a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 107506a37db7SGreg Kurz goto out_notify; 107606a37db7SGreg Kurz } 107760ce86c7SWei Liu 107860ce86c7SWei Liu /* keep these in sync */ 107960ce86c7SWei Liu pdu->size = len; 108060ce86c7SWei Liu pdu->id = id; 108160ce86c7SWei Liu 108206a37db7SGreg Kurz out_notify: 1083a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 108460ce86c7SWei Liu 108560ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1086f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 108760ce86c7SWei Liu pdu_free(pdu); 108860ce86c7SWei Liu } 1089f74e27bfSGreg Kurz } 109060ce86c7SWei Liu 109160ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 109260ce86c7SWei Liu { 109360ce86c7SWei Liu mode_t ret; 109460ce86c7SWei Liu 109560ce86c7SWei Liu ret = mode & 0777; 109660ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 109760ce86c7SWei Liu ret |= S_IFDIR; 109860ce86c7SWei Liu } 109960ce86c7SWei Liu 110060ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 110160ce86c7SWei Liu ret |= S_IFLNK; 110260ce86c7SWei Liu } 110360ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 110460ce86c7SWei Liu ret |= S_IFSOCK; 110560ce86c7SWei Liu } 110660ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 110760ce86c7SWei Liu ret |= S_IFIFO; 110860ce86c7SWei Liu } 110960ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 111060ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 111160ce86c7SWei Liu ret |= S_IFCHR; 111260ce86c7SWei Liu } else { 111360ce86c7SWei Liu ret |= S_IFBLK; 111460ce86c7SWei Liu } 111560ce86c7SWei Liu } 111660ce86c7SWei Liu 111760ce86c7SWei Liu if (!(ret&~0777)) { 111860ce86c7SWei Liu ret |= S_IFREG; 111960ce86c7SWei Liu } 112060ce86c7SWei Liu 112160ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 112260ce86c7SWei Liu ret |= S_ISUID; 112360ce86c7SWei Liu } 112460ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 112560ce86c7SWei Liu ret |= S_ISGID; 112660ce86c7SWei Liu } 112760ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 112860ce86c7SWei Liu ret |= S_ISVTX; 112960ce86c7SWei Liu } 113060ce86c7SWei Liu 113160ce86c7SWei Liu return ret; 113260ce86c7SWei Liu } 113360ce86c7SWei Liu 113460ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 113560ce86c7SWei Liu { 113660ce86c7SWei Liu if (stat->type == -1 && 113760ce86c7SWei Liu stat->dev == -1 && 113887032833SAntonios Motakis stat->qid.type == 0xff && 113987032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 114087032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 114160ce86c7SWei Liu stat->mode == -1 && 114260ce86c7SWei Liu stat->atime == -1 && 114360ce86c7SWei Liu stat->mtime == -1 && 114460ce86c7SWei Liu stat->length == -1 && 114560ce86c7SWei Liu !stat->name.size && 114660ce86c7SWei Liu !stat->uid.size && 114760ce86c7SWei Liu !stat->gid.size && 114860ce86c7SWei Liu !stat->muid.size && 114960ce86c7SWei Liu stat->n_uid == -1 && 115060ce86c7SWei Liu stat->n_gid == -1 && 115160ce86c7SWei Liu stat->n_muid == -1) { 115260ce86c7SWei Liu return 1; 115360ce86c7SWei Liu } 115460ce86c7SWei Liu 115560ce86c7SWei Liu return 0; 115660ce86c7SWei Liu } 115760ce86c7SWei Liu 115860ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 115960ce86c7SWei Liu { 116060ce86c7SWei Liu v9fs_string_init(&stat->name); 116160ce86c7SWei Liu v9fs_string_init(&stat->uid); 116260ce86c7SWei Liu v9fs_string_init(&stat->gid); 116360ce86c7SWei Liu v9fs_string_init(&stat->muid); 116460ce86c7SWei Liu v9fs_string_init(&stat->extension); 116560ce86c7SWei Liu } 116660ce86c7SWei Liu 116760ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 116860ce86c7SWei Liu { 116960ce86c7SWei Liu v9fs_string_free(&stat->name); 117060ce86c7SWei Liu v9fs_string_free(&stat->uid); 117160ce86c7SWei Liu v9fs_string_free(&stat->gid); 117260ce86c7SWei Liu v9fs_string_free(&stat->muid); 117360ce86c7SWei Liu v9fs_string_free(&stat->extension); 117460ce86c7SWei Liu } 117560ce86c7SWei Liu 117660ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 117760ce86c7SWei Liu { 117860ce86c7SWei Liu uint32_t mode; 117960ce86c7SWei Liu 118060ce86c7SWei Liu mode = stbuf->st_mode & 0777; 118160ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 118260ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 118360ce86c7SWei Liu } 118460ce86c7SWei Liu 118560ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 118660ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 118760ce86c7SWei Liu } 118860ce86c7SWei Liu 118960ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 119060ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 119160ce86c7SWei Liu } 119260ce86c7SWei Liu 119360ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 119460ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 119560ce86c7SWei Liu } 119660ce86c7SWei Liu 119760ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 119860ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 119960ce86c7SWei Liu } 120060ce86c7SWei Liu 120160ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 120260ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 120360ce86c7SWei Liu } 120460ce86c7SWei Liu 120560ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 120660ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 120760ce86c7SWei Liu } 120860ce86c7SWei Liu 120960ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 121060ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 121160ce86c7SWei Liu } 121260ce86c7SWei Liu 121360ce86c7SWei Liu return mode; 121460ce86c7SWei Liu } 121560ce86c7SWei Liu 12166069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 12176069537fSJan Dakinevich const char *basename, 121860ce86c7SWei Liu const struct stat *stbuf, 121960ce86c7SWei Liu V9fsStat *v9stat) 122060ce86c7SWei Liu { 122160ce86c7SWei Liu int err; 122260ce86c7SWei Liu 122360ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 122460ce86c7SWei Liu 12253b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12263b5ee9e8SAntonios Motakis if (err < 0) { 12273b5ee9e8SAntonios Motakis return err; 12283b5ee9e8SAntonios Motakis } 122960ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 123060ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 123160ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 123260ce86c7SWei Liu v9stat->length = stbuf->st_size; 123360ce86c7SWei Liu 1234abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1235abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1236abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 123760ce86c7SWei Liu 123860ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 123960ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 124060ce86c7SWei Liu v9stat->n_muid = 0; 124160ce86c7SWei Liu 1242abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 124360ce86c7SWei Liu 124460ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12456069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 124660ce86c7SWei Liu if (err < 0) { 124760ce86c7SWei Liu return err; 124860ce86c7SWei Liu } 124960ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 125060ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 125160ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 125260ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 125360ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 125460ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 125560ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 125660ce86c7SWei Liu } 125760ce86c7SWei Liu 12586069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 125960ce86c7SWei Liu 126060ce86c7SWei Liu v9stat->size = 61 + 126160ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 126260ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 126360ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 126460ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 126560ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 126660ce86c7SWei Liu return 0; 126760ce86c7SWei Liu } 126860ce86c7SWei Liu 126960ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 127060ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 127160ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 127260ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 127360ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 127460ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 127560ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 127660ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 127760ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 127860ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 127960ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 128060ce86c7SWei Liu 128160ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 128260ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 128360ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 128460ce86c7SWei Liu 128560ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 128660ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 128760ce86c7SWei Liu 128860ce86c7SWei Liu 12893b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 129060ce86c7SWei Liu V9fsStatDotl *v9lstat) 129160ce86c7SWei Liu { 129260ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 129360ce86c7SWei Liu 129460ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 129560ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 129660ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 129760ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 129860ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 129960ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 130060ce86c7SWei Liu v9lstat->st_blksize = stbuf->st_blksize; 130160ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 130260ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 130360ce86c7SWei Liu v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 130460ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 130560ce86c7SWei Liu v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 130660ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 130760ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 130860ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 130960ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 131060ce86c7SWei Liu 13113b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 131260ce86c7SWei Liu } 131360ce86c7SWei Liu 131460ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 131560ce86c7SWei Liu { 131660ce86c7SWei Liu int i; 131760ce86c7SWei Liu 131860ce86c7SWei Liu printf("sg[%d]: {", cnt); 131960ce86c7SWei Liu for (i = 0; i < cnt; i++) { 132060ce86c7SWei Liu if (i) { 132160ce86c7SWei Liu printf(", "); 132260ce86c7SWei Liu } 132360ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 132460ce86c7SWei Liu } 132560ce86c7SWei Liu printf("}\n"); 132660ce86c7SWei Liu } 132760ce86c7SWei Liu 132860ce86c7SWei Liu /* Will call this only for path name based fid */ 132960ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 133060ce86c7SWei Liu { 133160ce86c7SWei Liu V9fsPath str; 133260ce86c7SWei Liu v9fs_path_init(&str); 133360ce86c7SWei Liu v9fs_path_copy(&str, dst); 1334e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 133560ce86c7SWei Liu v9fs_path_free(&str); 133660ce86c7SWei Liu } 133760ce86c7SWei Liu 133860ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 133960ce86c7SWei Liu { 134060ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 134160ce86c7SWei Liu } 134260ce86c7SWei Liu 13438440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 134460ce86c7SWei Liu { 134560ce86c7SWei Liu ssize_t err; 134660ce86c7SWei Liu V9fsPDU *pdu = opaque; 134760ce86c7SWei Liu V9fsState *s = pdu->s; 134860ce86c7SWei Liu V9fsString version; 134960ce86c7SWei Liu size_t offset = 7; 135060ce86c7SWei Liu 135160ce86c7SWei Liu v9fs_string_init(&version); 135260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 135360ce86c7SWei Liu if (err < 0) { 135460ce86c7SWei Liu goto out; 135560ce86c7SWei Liu } 135660ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 135760ce86c7SWei Liu 135860ce86c7SWei Liu virtfs_reset(pdu); 135960ce86c7SWei Liu 136060ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 136160ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 136260ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 136360ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 136460ce86c7SWei Liu } else { 136560ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1366e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1367e16453a3SChristian Schoenebeck goto marshal; 136860ce86c7SWei Liu } 136960ce86c7SWei Liu 1370e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1371e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1372e16453a3SChristian Schoenebeck error_report( 1373e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1374e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1375e16453a3SChristian Schoenebeck ); 1376e16453a3SChristian Schoenebeck goto out; 1377e16453a3SChristian Schoenebeck } 1378e16453a3SChristian Schoenebeck 1379e16453a3SChristian Schoenebeck marshal: 138060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 138160ce86c7SWei Liu if (err < 0) { 138260ce86c7SWei Liu goto out; 138360ce86c7SWei Liu } 1384403a905bSPhilippe Mathieu-Daudé err += offset; 138560ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 138660ce86c7SWei Liu out: 1387403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 138860ce86c7SWei Liu v9fs_string_free(&version); 138960ce86c7SWei Liu } 139060ce86c7SWei Liu 13918440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 139260ce86c7SWei Liu { 139360ce86c7SWei Liu V9fsPDU *pdu = opaque; 139460ce86c7SWei Liu V9fsState *s = pdu->s; 139560ce86c7SWei Liu int32_t fid, afid, n_uname; 139660ce86c7SWei Liu V9fsString uname, aname; 139760ce86c7SWei Liu V9fsFidState *fidp; 139860ce86c7SWei Liu size_t offset = 7; 139960ce86c7SWei Liu V9fsQID qid; 140060ce86c7SWei Liu ssize_t err; 1401fe44dc91SAshijeet Acharya Error *local_err = NULL; 140260ce86c7SWei Liu 140360ce86c7SWei Liu v9fs_string_init(&uname); 140460ce86c7SWei Liu v9fs_string_init(&aname); 140560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 140660ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 140760ce86c7SWei Liu if (err < 0) { 140860ce86c7SWei Liu goto out_nofid; 140960ce86c7SWei Liu } 141060ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 141160ce86c7SWei Liu 141260ce86c7SWei Liu fidp = alloc_fid(s, fid); 141360ce86c7SWei Liu if (fidp == NULL) { 141460ce86c7SWei Liu err = -EINVAL; 141560ce86c7SWei Liu goto out_nofid; 141660ce86c7SWei Liu } 141760ce86c7SWei Liu fidp->uid = n_uname; 141860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 141960ce86c7SWei Liu if (err < 0) { 142060ce86c7SWei Liu err = -EINVAL; 142160ce86c7SWei Liu clunk_fid(s, fid); 142260ce86c7SWei Liu goto out; 142360ce86c7SWei Liu } 142460ce86c7SWei Liu err = fid_to_qid(pdu, fidp, &qid); 142560ce86c7SWei Liu if (err < 0) { 142660ce86c7SWei Liu err = -EINVAL; 142760ce86c7SWei Liu clunk_fid(s, fid); 142860ce86c7SWei Liu goto out; 142960ce86c7SWei Liu } 1430fe44dc91SAshijeet Acharya 1431fe44dc91SAshijeet Acharya /* 1432fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1433fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1434fe44dc91SAshijeet Acharya */ 1435fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1436fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1437fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1438fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 1439fe44dc91SAshijeet Acharya err = migrate_add_blocker(s->migration_blocker, &local_err); 1440fe44dc91SAshijeet Acharya if (local_err) { 1441fe44dc91SAshijeet Acharya error_free(local_err); 1442fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1443fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1444fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1445fe44dc91SAshijeet Acharya goto out; 1446fe44dc91SAshijeet Acharya } 1447fe44dc91SAshijeet Acharya s->root_fid = fid; 1448fe44dc91SAshijeet Acharya } 1449fe44dc91SAshijeet Acharya 145060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 145160ce86c7SWei Liu if (err < 0) { 145260ce86c7SWei Liu clunk_fid(s, fid); 145360ce86c7SWei Liu goto out; 145460ce86c7SWei Liu } 145560ce86c7SWei Liu err += offset; 1456fe44dc91SAshijeet Acharya 145756f101ecSGreg Kurz memcpy(&s->root_qid, &qid, sizeof(qid)); 145860ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 145960ce86c7SWei Liu qid.type, qid.version, qid.path); 146060ce86c7SWei Liu out: 146160ce86c7SWei Liu put_fid(pdu, fidp); 146260ce86c7SWei Liu out_nofid: 146360ce86c7SWei Liu pdu_complete(pdu, err); 146460ce86c7SWei Liu v9fs_string_free(&uname); 146560ce86c7SWei Liu v9fs_string_free(&aname); 146660ce86c7SWei Liu } 146760ce86c7SWei Liu 14688440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 146960ce86c7SWei Liu { 147060ce86c7SWei Liu int32_t fid; 147160ce86c7SWei Liu V9fsStat v9stat; 147260ce86c7SWei Liu ssize_t err = 0; 147360ce86c7SWei Liu size_t offset = 7; 147460ce86c7SWei Liu struct stat stbuf; 147560ce86c7SWei Liu V9fsFidState *fidp; 147660ce86c7SWei Liu V9fsPDU *pdu = opaque; 14776069537fSJan Dakinevich char *basename; 147860ce86c7SWei Liu 147960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 148060ce86c7SWei Liu if (err < 0) { 148160ce86c7SWei Liu goto out_nofid; 148260ce86c7SWei Liu } 148360ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 148460ce86c7SWei Liu 148560ce86c7SWei Liu fidp = get_fid(pdu, fid); 148660ce86c7SWei Liu if (fidp == NULL) { 148760ce86c7SWei Liu err = -ENOENT; 148860ce86c7SWei Liu goto out_nofid; 148960ce86c7SWei Liu } 149060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 149160ce86c7SWei Liu if (err < 0) { 149260ce86c7SWei Liu goto out; 149360ce86c7SWei Liu } 14946069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 14956069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 14966069537fSJan Dakinevich g_free(basename); 149760ce86c7SWei Liu if (err < 0) { 149860ce86c7SWei Liu goto out; 149960ce86c7SWei Liu } 150060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 150160ce86c7SWei Liu if (err < 0) { 150260ce86c7SWei Liu v9fs_stat_free(&v9stat); 150360ce86c7SWei Liu goto out; 150460ce86c7SWei Liu } 150560ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 150660ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 150760ce86c7SWei Liu err += offset; 150860ce86c7SWei Liu v9fs_stat_free(&v9stat); 150960ce86c7SWei Liu out: 151060ce86c7SWei Liu put_fid(pdu, fidp); 151160ce86c7SWei Liu out_nofid: 151260ce86c7SWei Liu pdu_complete(pdu, err); 151360ce86c7SWei Liu } 151460ce86c7SWei Liu 15158440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 151660ce86c7SWei Liu { 151760ce86c7SWei Liu int32_t fid; 151860ce86c7SWei Liu size_t offset = 7; 151960ce86c7SWei Liu ssize_t retval = 0; 152060ce86c7SWei Liu struct stat stbuf; 152160ce86c7SWei Liu V9fsFidState *fidp; 152260ce86c7SWei Liu uint64_t request_mask; 152360ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 152460ce86c7SWei Liu V9fsPDU *pdu = opaque; 152560ce86c7SWei Liu 152660ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 152760ce86c7SWei Liu if (retval < 0) { 152860ce86c7SWei Liu goto out_nofid; 152960ce86c7SWei Liu } 153060ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 153160ce86c7SWei Liu 153260ce86c7SWei Liu fidp = get_fid(pdu, fid); 153360ce86c7SWei Liu if (fidp == NULL) { 153460ce86c7SWei Liu retval = -ENOENT; 153560ce86c7SWei Liu goto out_nofid; 153660ce86c7SWei Liu } 153760ce86c7SWei Liu /* 153860ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 153960ce86c7SWei Liu * need to look at request_mask. 154060ce86c7SWei Liu */ 154160ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 154260ce86c7SWei Liu if (retval < 0) { 154360ce86c7SWei Liu goto out; 154460ce86c7SWei Liu } 15453b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15463b5ee9e8SAntonios Motakis if (retval < 0) { 15473b5ee9e8SAntonios Motakis goto out; 15483b5ee9e8SAntonios Motakis } 154960ce86c7SWei Liu 155060ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 155160ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 155260ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 155360ce86c7SWei Liu switch (retval) { 155460ce86c7SWei Liu case 0: 155560ce86c7SWei Liu /* we have valid st_gen: update result mask */ 155660ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 155760ce86c7SWei Liu break; 155860ce86c7SWei Liu case -EINTR: 155960ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 156060ce86c7SWei Liu goto out; 156160ce86c7SWei Liu default: 156260ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 156360ce86c7SWei Liu break; 156460ce86c7SWei Liu } 156560ce86c7SWei Liu } 156660ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 156760ce86c7SWei Liu if (retval < 0) { 156860ce86c7SWei Liu goto out; 156960ce86c7SWei Liu } 157060ce86c7SWei Liu retval += offset; 157160ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 157260ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 157360ce86c7SWei Liu v9stat_dotl.st_gid); 157460ce86c7SWei Liu out: 157560ce86c7SWei Liu put_fid(pdu, fidp); 157660ce86c7SWei Liu out_nofid: 157760ce86c7SWei Liu pdu_complete(pdu, retval); 157860ce86c7SWei Liu } 157960ce86c7SWei Liu 158060ce86c7SWei Liu /* Attribute flags */ 158160ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 158260ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 158360ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 158460ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 158560ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 158660ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 158760ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 158860ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 158960ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 159060ce86c7SWei Liu 159160ce86c7SWei Liu #define P9_ATTR_MASK 127 159260ce86c7SWei Liu 15938440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 159460ce86c7SWei Liu { 159560ce86c7SWei Liu int err = 0; 159660ce86c7SWei Liu int32_t fid; 159760ce86c7SWei Liu V9fsFidState *fidp; 159860ce86c7SWei Liu size_t offset = 7; 159960ce86c7SWei Liu V9fsIattr v9iattr; 160060ce86c7SWei Liu V9fsPDU *pdu = opaque; 160160ce86c7SWei Liu 160260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 160360ce86c7SWei Liu if (err < 0) { 160460ce86c7SWei Liu goto out_nofid; 160560ce86c7SWei Liu } 160660ce86c7SWei Liu 16078f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16088f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16098f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16108f9c64bfSGreg Kurz 161160ce86c7SWei Liu fidp = get_fid(pdu, fid); 161260ce86c7SWei Liu if (fidp == NULL) { 161360ce86c7SWei Liu err = -EINVAL; 161460ce86c7SWei Liu goto out_nofid; 161560ce86c7SWei Liu } 161660ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 161760ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 161860ce86c7SWei Liu if (err < 0) { 161960ce86c7SWei Liu goto out; 162060ce86c7SWei Liu } 162160ce86c7SWei Liu } 162260ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 162360ce86c7SWei Liu struct timespec times[2]; 162460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 162560ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 162660ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 162760ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 162860ce86c7SWei Liu } else { 162960ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 163060ce86c7SWei Liu } 163160ce86c7SWei Liu } else { 163260ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 163360ce86c7SWei Liu } 163460ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 163560ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 163660ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 163760ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 163860ce86c7SWei Liu } else { 163960ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 164060ce86c7SWei Liu } 164160ce86c7SWei Liu } else { 164260ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 164360ce86c7SWei Liu } 164460ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 164560ce86c7SWei Liu if (err < 0) { 164660ce86c7SWei Liu goto out; 164760ce86c7SWei Liu } 164860ce86c7SWei Liu } 164960ce86c7SWei Liu /* 165060ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 165160ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 165260ce86c7SWei Liu */ 165360ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 165460ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 165560ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 165660ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 165760ce86c7SWei Liu v9iattr.uid = -1; 165860ce86c7SWei Liu } 165960ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 166060ce86c7SWei Liu v9iattr.gid = -1; 166160ce86c7SWei Liu } 166260ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 166360ce86c7SWei Liu v9iattr.gid); 166460ce86c7SWei Liu if (err < 0) { 166560ce86c7SWei Liu goto out; 166660ce86c7SWei Liu } 166760ce86c7SWei Liu } 166860ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 166960ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 167060ce86c7SWei Liu if (err < 0) { 167160ce86c7SWei Liu goto out; 167260ce86c7SWei Liu } 167360ce86c7SWei Liu } 167460ce86c7SWei Liu err = offset; 16758f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 167660ce86c7SWei Liu out: 167760ce86c7SWei Liu put_fid(pdu, fidp); 167860ce86c7SWei Liu out_nofid: 167960ce86c7SWei Liu pdu_complete(pdu, err); 168060ce86c7SWei Liu } 168160ce86c7SWei Liu 168260ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 168360ce86c7SWei Liu { 168460ce86c7SWei Liu int i; 168560ce86c7SWei Liu ssize_t err; 168660ce86c7SWei Liu size_t offset = 7; 168760ce86c7SWei Liu 168860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 168960ce86c7SWei Liu if (err < 0) { 169060ce86c7SWei Liu return err; 169160ce86c7SWei Liu } 169260ce86c7SWei Liu offset += err; 169360ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 169460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 169560ce86c7SWei Liu if (err < 0) { 169660ce86c7SWei Liu return err; 169760ce86c7SWei Liu } 169860ce86c7SWei Liu offset += err; 169960ce86c7SWei Liu } 170060ce86c7SWei Liu return offset; 170160ce86c7SWei Liu } 170260ce86c7SWei Liu 1703fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1704fff39a7aSGreg Kurz { 1705fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1706fff39a7aSGreg Kurz } 1707fff39a7aSGreg Kurz 170856f101ecSGreg Kurz static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) 170956f101ecSGreg Kurz { 171056f101ecSGreg Kurz return 171156f101ecSGreg Kurz qid1->type != qid2->type || 171256f101ecSGreg Kurz qid1->version != qid2->version || 171356f101ecSGreg Kurz qid1->path != qid2->path; 171456f101ecSGreg Kurz } 171556f101ecSGreg Kurz 17168440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 171760ce86c7SWei Liu { 171860ce86c7SWei Liu int name_idx; 171960ce86c7SWei Liu V9fsQID *qids = NULL; 172060ce86c7SWei Liu int i, err = 0; 172160ce86c7SWei Liu V9fsPath dpath, path; 172260ce86c7SWei Liu uint16_t nwnames; 172360ce86c7SWei Liu struct stat stbuf; 172460ce86c7SWei Liu size_t offset = 7; 172560ce86c7SWei Liu int32_t fid, newfid; 172660ce86c7SWei Liu V9fsString *wnames = NULL; 172760ce86c7SWei Liu V9fsFidState *fidp; 172860ce86c7SWei Liu V9fsFidState *newfidp = NULL; 172960ce86c7SWei Liu V9fsPDU *pdu = opaque; 173060ce86c7SWei Liu V9fsState *s = pdu->s; 173156f101ecSGreg Kurz V9fsQID qid; 173260ce86c7SWei Liu 173360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 173460ce86c7SWei Liu if (err < 0) { 173560ce86c7SWei Liu pdu_complete(pdu, err); 173660ce86c7SWei Liu return ; 173760ce86c7SWei Liu } 173860ce86c7SWei Liu offset += err; 173960ce86c7SWei Liu 174060ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 174160ce86c7SWei Liu 174260ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 17431923923bSGreg Kurz wnames = g_new0(V9fsString, nwnames); 17441923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 174560ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 174660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 174760ce86c7SWei Liu if (err < 0) { 174860ce86c7SWei Liu goto out_nofid; 174960ce86c7SWei Liu } 1750fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1751fff39a7aSGreg Kurz err = -ENOENT; 1752fff39a7aSGreg Kurz goto out_nofid; 1753fff39a7aSGreg Kurz } 175460ce86c7SWei Liu offset += err; 175560ce86c7SWei Liu } 175660ce86c7SWei Liu } else if (nwnames > P9_MAXWELEM) { 175760ce86c7SWei Liu err = -EINVAL; 175860ce86c7SWei Liu goto out_nofid; 175960ce86c7SWei Liu } 176060ce86c7SWei Liu fidp = get_fid(pdu, fid); 176160ce86c7SWei Liu if (fidp == NULL) { 176260ce86c7SWei Liu err = -ENOENT; 176360ce86c7SWei Liu goto out_nofid; 176460ce86c7SWei Liu } 176556f101ecSGreg Kurz 176613fd08e6SGreg Kurz v9fs_path_init(&dpath); 176713fd08e6SGreg Kurz v9fs_path_init(&path); 176813fd08e6SGreg Kurz 176956f101ecSGreg Kurz err = fid_to_qid(pdu, fidp, &qid); 177056f101ecSGreg Kurz if (err < 0) { 177156f101ecSGreg Kurz goto out; 177256f101ecSGreg Kurz } 177356f101ecSGreg Kurz 177460ce86c7SWei Liu /* 177560ce86c7SWei Liu * Both dpath and path initially poin to fidp. 177660ce86c7SWei Liu * Needed to handle request with nwnames == 0 177760ce86c7SWei Liu */ 177860ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 177960ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 178060ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 178156f101ecSGreg Kurz if (not_same_qid(&pdu->s->root_qid, &qid) || 178256f101ecSGreg Kurz strcmp("..", wnames[name_idx].data)) { 178356f101ecSGreg Kurz err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, 178456f101ecSGreg Kurz &path); 178560ce86c7SWei Liu if (err < 0) { 178660ce86c7SWei Liu goto out; 178760ce86c7SWei Liu } 178856f101ecSGreg Kurz 178960ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 179060ce86c7SWei Liu if (err < 0) { 179160ce86c7SWei Liu goto out; 179260ce86c7SWei Liu } 17933b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 17943b5ee9e8SAntonios Motakis if (err < 0) { 17953b5ee9e8SAntonios Motakis goto out; 17963b5ee9e8SAntonios Motakis } 179760ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 179860ce86c7SWei Liu } 179956f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 180056f101ecSGreg Kurz } 180160ce86c7SWei Liu if (fid == newfid) { 180249dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 180349dd946bSGreg Kurz err = -EINVAL; 180449dd946bSGreg Kurz goto out; 180549dd946bSGreg Kurz } 18065b3c77aaSGreg Kurz v9fs_path_write_lock(s); 180760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 18085b3c77aaSGreg Kurz v9fs_path_unlock(s); 180960ce86c7SWei Liu } else { 181060ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 181160ce86c7SWei Liu if (newfidp == NULL) { 181260ce86c7SWei Liu err = -EINVAL; 181360ce86c7SWei Liu goto out; 181460ce86c7SWei Liu } 181560ce86c7SWei Liu newfidp->uid = fidp->uid; 181660ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 181760ce86c7SWei Liu } 181860ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 181960ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 182060ce86c7SWei Liu out: 182160ce86c7SWei Liu put_fid(pdu, fidp); 182260ce86c7SWei Liu if (newfidp) { 182360ce86c7SWei Liu put_fid(pdu, newfidp); 182460ce86c7SWei Liu } 182560ce86c7SWei Liu v9fs_path_free(&dpath); 182660ce86c7SWei Liu v9fs_path_free(&path); 182760ce86c7SWei Liu out_nofid: 182860ce86c7SWei Liu pdu_complete(pdu, err); 182960ce86c7SWei Liu if (nwnames && nwnames <= P9_MAXWELEM) { 183060ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 183160ce86c7SWei Liu v9fs_string_free(&wnames[name_idx]); 183260ce86c7SWei Liu } 183360ce86c7SWei Liu g_free(wnames); 183460ce86c7SWei Liu g_free(qids); 183560ce86c7SWei Liu } 183660ce86c7SWei Liu } 183760ce86c7SWei Liu 18388440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 183960ce86c7SWei Liu { 184060ce86c7SWei Liu struct statfs stbuf; 184160ce86c7SWei Liu int32_t iounit = 0; 184260ce86c7SWei Liu V9fsState *s = pdu->s; 184360ce86c7SWei Liu 184460ce86c7SWei Liu /* 184560ce86c7SWei Liu * iounit should be multiples of f_bsize (host filesystem block size 184660ce86c7SWei Liu * and as well as less than (client msize - P9_IOHDRSZ)) 184760ce86c7SWei Liu */ 184860ce86c7SWei Liu if (!v9fs_co_statfs(pdu, path, &stbuf)) { 184968d654daSDan Schatzberg if (stbuf.f_bsize) { 185060ce86c7SWei Liu iounit = stbuf.f_bsize; 185160ce86c7SWei Liu iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; 185260ce86c7SWei Liu } 185368d654daSDan Schatzberg } 185460ce86c7SWei Liu if (!iounit) { 185560ce86c7SWei Liu iounit = s->msize - P9_IOHDRSZ; 185660ce86c7SWei Liu } 185760ce86c7SWei Liu return iounit; 185860ce86c7SWei Liu } 185960ce86c7SWei Liu 18608440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 186160ce86c7SWei Liu { 186260ce86c7SWei Liu int flags; 186360ce86c7SWei Liu int32_t fid; 186460ce86c7SWei Liu int32_t mode; 186560ce86c7SWei Liu V9fsQID qid; 186660ce86c7SWei Liu int iounit = 0; 186760ce86c7SWei Liu ssize_t err = 0; 186860ce86c7SWei Liu size_t offset = 7; 186960ce86c7SWei Liu struct stat stbuf; 187060ce86c7SWei Liu V9fsFidState *fidp; 187160ce86c7SWei Liu V9fsPDU *pdu = opaque; 187260ce86c7SWei Liu V9fsState *s = pdu->s; 187360ce86c7SWei Liu 187460ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 187560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 187660ce86c7SWei Liu } else { 187760ce86c7SWei Liu uint8_t modebyte; 187860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 187960ce86c7SWei Liu mode = modebyte; 188060ce86c7SWei Liu } 188160ce86c7SWei Liu if (err < 0) { 188260ce86c7SWei Liu goto out_nofid; 188360ce86c7SWei Liu } 188460ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 188560ce86c7SWei Liu 188660ce86c7SWei Liu fidp = get_fid(pdu, fid); 188760ce86c7SWei Liu if (fidp == NULL) { 188860ce86c7SWei Liu err = -ENOENT; 188960ce86c7SWei Liu goto out_nofid; 189060ce86c7SWei Liu } 189149dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 189249dd946bSGreg Kurz err = -EINVAL; 189349dd946bSGreg Kurz goto out; 189449dd946bSGreg Kurz } 189560ce86c7SWei Liu 189660ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 189760ce86c7SWei Liu if (err < 0) { 189860ce86c7SWei Liu goto out; 189960ce86c7SWei Liu } 19003b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19013b5ee9e8SAntonios Motakis if (err < 0) { 19023b5ee9e8SAntonios Motakis goto out; 19033b5ee9e8SAntonios Motakis } 190460ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 190560ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 190660ce86c7SWei Liu if (err < 0) { 190760ce86c7SWei Liu goto out; 190860ce86c7SWei Liu } 190960ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 191060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 191160ce86c7SWei Liu if (err < 0) { 191260ce86c7SWei Liu goto out; 191360ce86c7SWei Liu } 191460ce86c7SWei Liu err += offset; 191560ce86c7SWei Liu } else { 191660ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 191760ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 191860ce86c7SWei Liu } else { 191960ce86c7SWei Liu flags = omode_to_uflags(mode); 192060ce86c7SWei Liu } 192160ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 192260ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 192360ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 192460ce86c7SWei Liu err = -EROFS; 192560ce86c7SWei Liu goto out; 192660ce86c7SWei Liu } 192760ce86c7SWei Liu } 192860ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 192960ce86c7SWei Liu if (err < 0) { 193060ce86c7SWei Liu goto out; 193160ce86c7SWei Liu } 193260ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 193360ce86c7SWei Liu fidp->open_flags = flags; 193460ce86c7SWei Liu if (flags & O_EXCL) { 193560ce86c7SWei Liu /* 193660ce86c7SWei Liu * We let the host file system do O_EXCL check 193760ce86c7SWei Liu * We should not reclaim such fd 193860ce86c7SWei Liu */ 193960ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 194060ce86c7SWei Liu } 194160ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 194260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 194360ce86c7SWei Liu if (err < 0) { 194460ce86c7SWei Liu goto out; 194560ce86c7SWei Liu } 194660ce86c7SWei Liu err += offset; 194760ce86c7SWei Liu } 194860ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 194960ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 195060ce86c7SWei Liu out: 195160ce86c7SWei Liu put_fid(pdu, fidp); 195260ce86c7SWei Liu out_nofid: 195360ce86c7SWei Liu pdu_complete(pdu, err); 195460ce86c7SWei Liu } 195560ce86c7SWei Liu 19568440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 195760ce86c7SWei Liu { 195860ce86c7SWei Liu int32_t dfid, flags, mode; 195960ce86c7SWei Liu gid_t gid; 196060ce86c7SWei Liu ssize_t err = 0; 196160ce86c7SWei Liu ssize_t offset = 7; 196260ce86c7SWei Liu V9fsString name; 196360ce86c7SWei Liu V9fsFidState *fidp; 196460ce86c7SWei Liu struct stat stbuf; 196560ce86c7SWei Liu V9fsQID qid; 196660ce86c7SWei Liu int32_t iounit; 196760ce86c7SWei Liu V9fsPDU *pdu = opaque; 196860ce86c7SWei Liu 196960ce86c7SWei Liu v9fs_string_init(&name); 197060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 197160ce86c7SWei Liu &name, &flags, &mode, &gid); 197260ce86c7SWei Liu if (err < 0) { 197360ce86c7SWei Liu goto out_nofid; 197460ce86c7SWei Liu } 197560ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 197660ce86c7SWei Liu 1977fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 1978fff39a7aSGreg Kurz err = -ENOENT; 1979fff39a7aSGreg Kurz goto out_nofid; 1980fff39a7aSGreg Kurz } 1981fff39a7aSGreg Kurz 1982805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 1983805b5d98SGreg Kurz err = -EEXIST; 1984805b5d98SGreg Kurz goto out_nofid; 1985805b5d98SGreg Kurz } 1986805b5d98SGreg Kurz 198760ce86c7SWei Liu fidp = get_fid(pdu, dfid); 198860ce86c7SWei Liu if (fidp == NULL) { 198960ce86c7SWei Liu err = -ENOENT; 199060ce86c7SWei Liu goto out_nofid; 199160ce86c7SWei Liu } 1992d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 1993d63fb193SLi Qiang err = -EINVAL; 1994d63fb193SLi Qiang goto out; 1995d63fb193SLi Qiang } 199660ce86c7SWei Liu 199760ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 199860ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 199960ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 200060ce86c7SWei Liu if (err < 0) { 200160ce86c7SWei Liu goto out; 200260ce86c7SWei Liu } 200360ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 200460ce86c7SWei Liu fidp->open_flags = flags; 200560ce86c7SWei Liu if (flags & O_EXCL) { 200660ce86c7SWei Liu /* 200760ce86c7SWei Liu * We let the host file system do O_EXCL check 200860ce86c7SWei Liu * We should not reclaim such fd 200960ce86c7SWei Liu */ 201060ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 201160ce86c7SWei Liu } 201260ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20133b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20143b5ee9e8SAntonios Motakis if (err < 0) { 20153b5ee9e8SAntonios Motakis goto out; 20163b5ee9e8SAntonios Motakis } 201760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 201860ce86c7SWei Liu if (err < 0) { 201960ce86c7SWei Liu goto out; 202060ce86c7SWei Liu } 202160ce86c7SWei Liu err += offset; 202260ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 202360ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 202460ce86c7SWei Liu out: 202560ce86c7SWei Liu put_fid(pdu, fidp); 202660ce86c7SWei Liu out_nofid: 202760ce86c7SWei Liu pdu_complete(pdu, err); 202860ce86c7SWei Liu v9fs_string_free(&name); 202960ce86c7SWei Liu } 203060ce86c7SWei Liu 2031a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 203260ce86c7SWei Liu { 203360ce86c7SWei Liu int err; 203460ce86c7SWei Liu int32_t fid; 203560ce86c7SWei Liu int datasync; 203660ce86c7SWei Liu size_t offset = 7; 203760ce86c7SWei Liu V9fsFidState *fidp; 203860ce86c7SWei Liu V9fsPDU *pdu = opaque; 203960ce86c7SWei Liu 204060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 204160ce86c7SWei Liu if (err < 0) { 204260ce86c7SWei Liu goto out_nofid; 204360ce86c7SWei Liu } 204460ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 204560ce86c7SWei Liu 204660ce86c7SWei Liu fidp = get_fid(pdu, fid); 204760ce86c7SWei Liu if (fidp == NULL) { 204860ce86c7SWei Liu err = -ENOENT; 204960ce86c7SWei Liu goto out_nofid; 205060ce86c7SWei Liu } 205160ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 205260ce86c7SWei Liu if (!err) { 205360ce86c7SWei Liu err = offset; 205460ce86c7SWei Liu } 205560ce86c7SWei Liu put_fid(pdu, fidp); 205660ce86c7SWei Liu out_nofid: 205760ce86c7SWei Liu pdu_complete(pdu, err); 205860ce86c7SWei Liu } 205960ce86c7SWei Liu 20608440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 206160ce86c7SWei Liu { 206260ce86c7SWei Liu int err; 206360ce86c7SWei Liu int32_t fid; 206460ce86c7SWei Liu size_t offset = 7; 206560ce86c7SWei Liu V9fsFidState *fidp; 206660ce86c7SWei Liu V9fsPDU *pdu = opaque; 206760ce86c7SWei Liu V9fsState *s = pdu->s; 206860ce86c7SWei Liu 206960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 207060ce86c7SWei Liu if (err < 0) { 207160ce86c7SWei Liu goto out_nofid; 207260ce86c7SWei Liu } 207360ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 207460ce86c7SWei Liu 207560ce86c7SWei Liu fidp = clunk_fid(s, fid); 207660ce86c7SWei Liu if (fidp == NULL) { 207760ce86c7SWei Liu err = -ENOENT; 207860ce86c7SWei Liu goto out_nofid; 207960ce86c7SWei Liu } 208060ce86c7SWei Liu /* 208160ce86c7SWei Liu * Bump the ref so that put_fid will 208260ce86c7SWei Liu * free the fid. 208360ce86c7SWei Liu */ 208460ce86c7SWei Liu fidp->ref++; 208560ce86c7SWei Liu err = put_fid(pdu, fidp); 208660ce86c7SWei Liu if (!err) { 208760ce86c7SWei Liu err = offset; 208860ce86c7SWei Liu } 208960ce86c7SWei Liu out_nofid: 209060ce86c7SWei Liu pdu_complete(pdu, err); 209160ce86c7SWei Liu } 209260ce86c7SWei Liu 2093bcb8998fSStefano Stabellini /* 2094bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2095bcb8998fSStefano Stabellini * 2096bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2097bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2098bcb8998fSStefano Stabellini * @size: number of bytes to include 2099bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2100bcb8998fSStefano Stabellini * 2101bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2102bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2103bcb8998fSStefano Stabellini */ 2104bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 210516724a17SGreg Kurz size_t skip, size_t *size, 2106bcb8998fSStefano Stabellini bool is_write) 2107bcb8998fSStefano Stabellini { 2108bcb8998fSStefano Stabellini QEMUIOVector elem; 2109bcb8998fSStefano Stabellini struct iovec *iov; 2110bcb8998fSStefano Stabellini unsigned int niov; 211116724a17SGreg Kurz size_t alloc_size = *size + skip; 2112bcb8998fSStefano Stabellini 211388da0b03SStefano Stabellini if (is_write) { 211416724a17SGreg Kurz pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, alloc_size); 211588da0b03SStefano Stabellini } else { 211616724a17SGreg Kurz pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, &alloc_size); 211716724a17SGreg Kurz } 211816724a17SGreg Kurz 211916724a17SGreg Kurz if (alloc_size < skip) { 212016724a17SGreg Kurz *size = 0; 212116724a17SGreg Kurz } else { 212216724a17SGreg Kurz *size = alloc_size - skip; 212388da0b03SStefano Stabellini } 2124bcb8998fSStefano Stabellini 2125bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2126bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 212716724a17SGreg Kurz qemu_iovec_concat(qiov, &elem, skip, *size); 2128bcb8998fSStefano Stabellini } 2129bcb8998fSStefano Stabellini 213060ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 213160ce86c7SWei Liu uint64_t off, uint32_t max_count) 213260ce86c7SWei Liu { 213360ce86c7SWei Liu ssize_t err; 213460ce86c7SWei Liu size_t offset = 7; 213516724a17SGreg Kurz size_t read_count; 2136bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 213760ce86c7SWei Liu 21387e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21397e55d65cSLi Qiang read_count = 0; 214016724a17SGreg Kurz } else if (fidp->fs.xattr.len - off < max_count) { 21417e55d65cSLi Qiang read_count = fidp->fs.xattr.len - off; 214216724a17SGreg Kurz } else { 214360ce86c7SWei Liu read_count = max_count; 214460ce86c7SWei Liu } 214560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 214660ce86c7SWei Liu if (err < 0) { 214760ce86c7SWei Liu return err; 214860ce86c7SWei Liu } 214960ce86c7SWei Liu offset += err; 215000588a0aSWei Liu 215116724a17SGreg Kurz v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, &read_count, false); 2152fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 215360ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 215460ce86c7SWei Liu read_count); 2155bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 215660ce86c7SWei Liu if (err < 0) { 215760ce86c7SWei Liu return err; 215860ce86c7SWei Liu } 215960ce86c7SWei Liu offset += err; 216060ce86c7SWei Liu return offset; 216160ce86c7SWei Liu } 216260ce86c7SWei Liu 21638440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 21648440e22eSGreg Kurz V9fsFidState *fidp, 21658440e22eSGreg Kurz uint32_t max_count) 216660ce86c7SWei Liu { 216760ce86c7SWei Liu V9fsPath path; 216860ce86c7SWei Liu V9fsStat v9stat; 216960ce86c7SWei Liu int len, err = 0; 217060ce86c7SWei Liu int32_t count = 0; 217160ce86c7SWei Liu struct stat stbuf; 217260ce86c7SWei Liu off_t saved_dir_pos; 2173635324e8SGreg Kurz struct dirent *dent; 217460ce86c7SWei Liu 217560ce86c7SWei Liu /* save the directory position */ 217660ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 217760ce86c7SWei Liu if (saved_dir_pos < 0) { 217860ce86c7SWei Liu return saved_dir_pos; 217960ce86c7SWei Liu } 218060ce86c7SWei Liu 218160ce86c7SWei Liu while (1) { 218260ce86c7SWei Liu v9fs_path_init(&path); 21837cde47d4SGreg Kurz 21847cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 21857cde47d4SGreg Kurz 2186635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2187635324e8SGreg Kurz if (err || !dent) { 218860ce86c7SWei Liu break; 218960ce86c7SWei Liu } 219060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 219160ce86c7SWei Liu if (err < 0) { 21928762a46dSGreg Kurz break; 219360ce86c7SWei Liu } 219460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 219560ce86c7SWei Liu if (err < 0) { 21968762a46dSGreg Kurz break; 219760ce86c7SWei Liu } 21986069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 219960ce86c7SWei Liu if (err < 0) { 22008762a46dSGreg Kurz break; 220160ce86c7SWei Liu } 2202772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 22037cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22047cde47d4SGreg Kurz 220560ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 220660ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 220760ce86c7SWei Liu v9fs_stat_free(&v9stat); 220860ce86c7SWei Liu v9fs_path_free(&path); 220960ce86c7SWei Liu return count; 221060ce86c7SWei Liu } 2211772a7369SJan Dakinevich 2212772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2213772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2214772a7369SJan Dakinevich 2215772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2216772a7369SJan Dakinevich 2217772a7369SJan Dakinevich if (len < 0) { 2218772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2219772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2220772a7369SJan Dakinevich v9fs_path_free(&path); 2221772a7369SJan Dakinevich return len; 2222772a7369SJan Dakinevich } 222360ce86c7SWei Liu count += len; 222460ce86c7SWei Liu v9fs_stat_free(&v9stat); 222560ce86c7SWei Liu v9fs_path_free(&path); 222660ce86c7SWei Liu saved_dir_pos = dent->d_off; 222760ce86c7SWei Liu } 22288762a46dSGreg Kurz 22297cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22307cde47d4SGreg Kurz 223160ce86c7SWei Liu v9fs_path_free(&path); 223260ce86c7SWei Liu if (err < 0) { 223360ce86c7SWei Liu return err; 223460ce86c7SWei Liu } 223560ce86c7SWei Liu return count; 223660ce86c7SWei Liu } 223760ce86c7SWei Liu 22388440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 223960ce86c7SWei Liu { 224060ce86c7SWei Liu int32_t fid; 224160ce86c7SWei Liu uint64_t off; 224260ce86c7SWei Liu ssize_t err = 0; 224360ce86c7SWei Liu int32_t count = 0; 224460ce86c7SWei Liu size_t offset = 7; 224560ce86c7SWei Liu uint32_t max_count; 224660ce86c7SWei Liu V9fsFidState *fidp; 224760ce86c7SWei Liu V9fsPDU *pdu = opaque; 224860ce86c7SWei Liu V9fsState *s = pdu->s; 224960ce86c7SWei Liu 225060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 225160ce86c7SWei Liu if (err < 0) { 225260ce86c7SWei Liu goto out_nofid; 225360ce86c7SWei Liu } 225460ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 225560ce86c7SWei Liu 225660ce86c7SWei Liu fidp = get_fid(pdu, fid); 225760ce86c7SWei Liu if (fidp == NULL) { 225860ce86c7SWei Liu err = -EINVAL; 225960ce86c7SWei Liu goto out_nofid; 226060ce86c7SWei Liu } 226160ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 226260ce86c7SWei Liu 226360ce86c7SWei Liu if (off == 0) { 226460ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 226560ce86c7SWei Liu } 226660ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 226760ce86c7SWei Liu if (count < 0) { 226860ce86c7SWei Liu err = count; 226960ce86c7SWei Liu goto out; 227060ce86c7SWei Liu } 227160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 227260ce86c7SWei Liu if (err < 0) { 227360ce86c7SWei Liu goto out; 227460ce86c7SWei Liu } 227560ce86c7SWei Liu err += offset + count; 227660ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 227760ce86c7SWei Liu QEMUIOVector qiov_full; 227860ce86c7SWei Liu QEMUIOVector qiov; 227960ce86c7SWei Liu int32_t len; 228016724a17SGreg Kurz size_t size = max_count; 228160ce86c7SWei Liu 228216724a17SGreg Kurz v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, &size, false); 228360ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 228416724a17SGreg Kurz max_count = size; 228560ce86c7SWei Liu do { 228660ce86c7SWei Liu qemu_iovec_reset(&qiov); 228760ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 228860ce86c7SWei Liu if (0) { 228960ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 229060ce86c7SWei Liu } 229160ce86c7SWei Liu /* Loop in case of EINTR */ 229260ce86c7SWei Liu do { 229360ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 229460ce86c7SWei Liu if (len >= 0) { 229560ce86c7SWei Liu off += len; 229660ce86c7SWei Liu count += len; 229760ce86c7SWei Liu } 229860ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 229960ce86c7SWei Liu if (len < 0) { 230060ce86c7SWei Liu /* IO error return the error */ 230160ce86c7SWei Liu err = len; 2302e95c9a49SLi Qiang goto out_free_iovec; 230360ce86c7SWei Liu } 230460ce86c7SWei Liu } while (count < max_count && len > 0); 230560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 230660ce86c7SWei Liu if (err < 0) { 2307e95c9a49SLi Qiang goto out_free_iovec; 230860ce86c7SWei Liu } 230960ce86c7SWei Liu err += offset + count; 2310e95c9a49SLi Qiang out_free_iovec: 231160ce86c7SWei Liu qemu_iovec_destroy(&qiov); 231260ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 231360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 231460ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 231560ce86c7SWei Liu } else { 231660ce86c7SWei Liu err = -EINVAL; 231760ce86c7SWei Liu } 231860ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 231960ce86c7SWei Liu out: 232060ce86c7SWei Liu put_fid(pdu, fidp); 232160ce86c7SWei Liu out_nofid: 232260ce86c7SWei Liu pdu_complete(pdu, err); 232360ce86c7SWei Liu } 232460ce86c7SWei Liu 232560ce86c7SWei Liu static size_t v9fs_readdir_data_size(V9fsString *name) 232660ce86c7SWei Liu { 232760ce86c7SWei Liu /* 232860ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 232960ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 233060ce86c7SWei Liu */ 233160ce86c7SWei Liu return 24 + v9fs_string_size(name); 233260ce86c7SWei Liu } 233360ce86c7SWei Liu 23348440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 23358440e22eSGreg Kurz int32_t max_count) 233660ce86c7SWei Liu { 233760ce86c7SWei Liu size_t size; 233860ce86c7SWei Liu V9fsQID qid; 233960ce86c7SWei Liu V9fsString name; 234060ce86c7SWei Liu int len, err = 0; 234160ce86c7SWei Liu int32_t count = 0; 234260ce86c7SWei Liu off_t saved_dir_pos; 2343635324e8SGreg Kurz struct dirent *dent; 234460ce86c7SWei Liu 234560ce86c7SWei Liu /* save the directory position */ 234660ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 234760ce86c7SWei Liu if (saved_dir_pos < 0) { 234860ce86c7SWei Liu return saved_dir_pos; 234960ce86c7SWei Liu } 235060ce86c7SWei Liu 235160ce86c7SWei Liu while (1) { 23527cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 23537cde47d4SGreg Kurz 2354635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2355635324e8SGreg Kurz if (err || !dent) { 235660ce86c7SWei Liu break; 235760ce86c7SWei Liu } 235860ce86c7SWei Liu v9fs_string_init(&name); 235960ce86c7SWei Liu v9fs_string_sprintf(&name, "%s", dent->d_name); 236060ce86c7SWei Liu if ((count + v9fs_readdir_data_size(&name)) > max_count) { 23617cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 23627cde47d4SGreg Kurz 236360ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 236460ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 236560ce86c7SWei Liu v9fs_string_free(&name); 236660ce86c7SWei Liu return count; 236760ce86c7SWei Liu } 23681a6ed33cSAntonios Motakis 23691a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 23701a6ed33cSAntonios Motakis /* 23711a6ed33cSAntonios Motakis * dirent_to_qid() implies expensive stat call for each entry, 23721a6ed33cSAntonios Motakis * we must do that here though since inode remapping requires 23731a6ed33cSAntonios Motakis * the device id, which in turn might be different for 23741a6ed33cSAntonios Motakis * different entries; we cannot make any assumption to avoid 23751a6ed33cSAntonios Motakis * that here. 23761a6ed33cSAntonios Motakis */ 23771a6ed33cSAntonios Motakis err = dirent_to_qid(pdu, fidp, dent, &qid); 23781a6ed33cSAntonios Motakis if (err < 0) { 23791a6ed33cSAntonios Motakis v9fs_readdir_unlock(&fidp->fs.dir); 23801a6ed33cSAntonios Motakis v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 23811a6ed33cSAntonios Motakis v9fs_string_free(&name); 23821a6ed33cSAntonios Motakis return err; 23831a6ed33cSAntonios Motakis } 23841a6ed33cSAntonios Motakis } else { 238560ce86c7SWei Liu /* 238660ce86c7SWei Liu * Fill up just the path field of qid because the client uses 238760ce86c7SWei Liu * only that. To fill the entire qid structure we will have 23881a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 23891a6ed33cSAntonios Motakis * latter reason we don't call dirent_to_qid() here. Only drawback 23901a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 23911a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 23921a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 23931a6ed33cSAntonios Motakis * files/dirs through other ways. 239460ce86c7SWei Liu */ 239560ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 239660ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 239760ce86c7SWei Liu /* Fill the other fields with dummy values */ 239860ce86c7SWei Liu qid.type = 0; 239960ce86c7SWei Liu qid.version = 0; 24001a6ed33cSAntonios Motakis } 240160ce86c7SWei Liu 240260ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 240360ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 240460ce86c7SWei Liu &qid, dent->d_off, 240560ce86c7SWei Liu dent->d_type, &name); 24067cde47d4SGreg Kurz 24077cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 24087cde47d4SGreg Kurz 240960ce86c7SWei Liu if (len < 0) { 241060ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 241160ce86c7SWei Liu v9fs_string_free(&name); 241260ce86c7SWei Liu return len; 241360ce86c7SWei Liu } 241460ce86c7SWei Liu count += len; 241560ce86c7SWei Liu v9fs_string_free(&name); 241660ce86c7SWei Liu saved_dir_pos = dent->d_off; 241760ce86c7SWei Liu } 24187cde47d4SGreg Kurz 24197cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 24207cde47d4SGreg Kurz 242160ce86c7SWei Liu if (err < 0) { 242260ce86c7SWei Liu return err; 242360ce86c7SWei Liu } 242460ce86c7SWei Liu return count; 242560ce86c7SWei Liu } 242660ce86c7SWei Liu 24278440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 242860ce86c7SWei Liu { 242960ce86c7SWei Liu int32_t fid; 243060ce86c7SWei Liu V9fsFidState *fidp; 243160ce86c7SWei Liu ssize_t retval = 0; 243260ce86c7SWei Liu size_t offset = 7; 243360ce86c7SWei Liu uint64_t initial_offset; 243460ce86c7SWei Liu int32_t count; 243560ce86c7SWei Liu uint32_t max_count; 243660ce86c7SWei Liu V9fsPDU *pdu = opaque; 2437d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 243860ce86c7SWei Liu 243960ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 244060ce86c7SWei Liu &initial_offset, &max_count); 244160ce86c7SWei Liu if (retval < 0) { 244260ce86c7SWei Liu goto out_nofid; 244360ce86c7SWei Liu } 244460ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 244560ce86c7SWei Liu 2446d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2447d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2448d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2449d36a5c22SChristian Schoenebeck warn_report_once( 2450d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2451d36a5c22SChristian Schoenebeck ); 2452d36a5c22SChristian Schoenebeck } 2453d36a5c22SChristian Schoenebeck 245460ce86c7SWei Liu fidp = get_fid(pdu, fid); 245560ce86c7SWei Liu if (fidp == NULL) { 245660ce86c7SWei Liu retval = -EINVAL; 245760ce86c7SWei Liu goto out_nofid; 245860ce86c7SWei Liu } 2459f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 246060ce86c7SWei Liu retval = -EINVAL; 246160ce86c7SWei Liu goto out; 246260ce86c7SWei Liu } 246360ce86c7SWei Liu if (initial_offset == 0) { 246460ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 246560ce86c7SWei Liu } else { 246660ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, initial_offset); 246760ce86c7SWei Liu } 246860ce86c7SWei Liu count = v9fs_do_readdir(pdu, fidp, 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; 253516724a17SGreg Kurz size_t size; 253660ce86c7SWei Liu V9fsFidState *fidp; 253760ce86c7SWei Liu V9fsPDU *pdu = opaque; 253860ce86c7SWei Liu V9fsState *s = pdu->s; 253960ce86c7SWei Liu QEMUIOVector qiov_full; 254060ce86c7SWei Liu QEMUIOVector qiov; 254160ce86c7SWei Liu 254260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 254360ce86c7SWei Liu if (err < 0) { 254460ce86c7SWei Liu pdu_complete(pdu, err); 254560ce86c7SWei Liu return; 254660ce86c7SWei Liu } 254760ce86c7SWei Liu offset += err; 254816724a17SGreg Kurz size = count; 254916724a17SGreg Kurz v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, &size, true); 255016724a17SGreg Kurz count = size; 255160ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 255260ce86c7SWei Liu 255360ce86c7SWei Liu fidp = get_fid(pdu, fid); 255460ce86c7SWei Liu if (fidp == NULL) { 255560ce86c7SWei Liu err = -EINVAL; 255660ce86c7SWei Liu goto out_nofid; 255760ce86c7SWei Liu } 255860ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 255960ce86c7SWei Liu if (fidp->fs.fd == -1) { 256060ce86c7SWei Liu err = -EINVAL; 256160ce86c7SWei Liu goto out; 256260ce86c7SWei Liu } 256360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 256460ce86c7SWei Liu /* 256560ce86c7SWei Liu * setxattr operation 256660ce86c7SWei Liu */ 256760ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 256860ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 256960ce86c7SWei Liu goto out; 257060ce86c7SWei Liu } else { 257160ce86c7SWei Liu err = -EINVAL; 257260ce86c7SWei Liu goto out; 257360ce86c7SWei Liu } 257460ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 257560ce86c7SWei Liu do { 257660ce86c7SWei Liu qemu_iovec_reset(&qiov); 257760ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 257860ce86c7SWei Liu if (0) { 257960ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 258060ce86c7SWei Liu } 258160ce86c7SWei Liu /* Loop in case of EINTR */ 258260ce86c7SWei Liu do { 258360ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 258460ce86c7SWei Liu if (len >= 0) { 258560ce86c7SWei Liu off += len; 258660ce86c7SWei Liu total += len; 258760ce86c7SWei Liu } 258860ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 258960ce86c7SWei Liu if (len < 0) { 259060ce86c7SWei Liu /* IO error return the error */ 259160ce86c7SWei Liu err = len; 259260ce86c7SWei Liu goto out_qiov; 259360ce86c7SWei Liu } 259460ce86c7SWei Liu } while (total < count && len > 0); 259560ce86c7SWei Liu 259660ce86c7SWei Liu offset = 7; 259760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 259860ce86c7SWei Liu if (err < 0) { 2599fdfcc9aeSLi Qiang goto out_qiov; 260060ce86c7SWei Liu } 260160ce86c7SWei Liu err += offset; 260260ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 260360ce86c7SWei Liu out_qiov: 260460ce86c7SWei Liu qemu_iovec_destroy(&qiov); 260560ce86c7SWei Liu out: 260660ce86c7SWei Liu put_fid(pdu, fidp); 260760ce86c7SWei Liu out_nofid: 260860ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 260960ce86c7SWei Liu pdu_complete(pdu, err); 261060ce86c7SWei Liu } 261160ce86c7SWei Liu 26128440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 261360ce86c7SWei Liu { 261460ce86c7SWei Liu int32_t fid; 261560ce86c7SWei Liu int err = 0; 261660ce86c7SWei Liu size_t offset = 7; 261760ce86c7SWei Liu V9fsFidState *fidp; 261860ce86c7SWei Liu V9fsQID qid; 261960ce86c7SWei Liu int32_t perm; 262060ce86c7SWei Liu int8_t mode; 262160ce86c7SWei Liu V9fsPath path; 262260ce86c7SWei Liu struct stat stbuf; 262360ce86c7SWei Liu V9fsString name; 262460ce86c7SWei Liu V9fsString extension; 262560ce86c7SWei Liu int iounit; 262660ce86c7SWei Liu V9fsPDU *pdu = opaque; 26275b3c77aaSGreg Kurz V9fsState *s = pdu->s; 262860ce86c7SWei Liu 262960ce86c7SWei Liu v9fs_path_init(&path); 263060ce86c7SWei Liu v9fs_string_init(&name); 263160ce86c7SWei Liu v9fs_string_init(&extension); 263260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 263360ce86c7SWei Liu &perm, &mode, &extension); 263460ce86c7SWei Liu if (err < 0) { 263560ce86c7SWei Liu goto out_nofid; 263660ce86c7SWei Liu } 263760ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 263860ce86c7SWei Liu 2639fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2640fff39a7aSGreg Kurz err = -ENOENT; 2641fff39a7aSGreg Kurz goto out_nofid; 2642fff39a7aSGreg Kurz } 2643fff39a7aSGreg Kurz 2644805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2645805b5d98SGreg Kurz err = -EEXIST; 2646805b5d98SGreg Kurz goto out_nofid; 2647805b5d98SGreg Kurz } 2648805b5d98SGreg Kurz 264960ce86c7SWei Liu fidp = get_fid(pdu, fid); 265060ce86c7SWei Liu if (fidp == NULL) { 265160ce86c7SWei Liu err = -EINVAL; 265260ce86c7SWei Liu goto out_nofid; 265360ce86c7SWei Liu } 2654d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2655d63fb193SLi Qiang err = -EINVAL; 2656d63fb193SLi Qiang goto out; 2657d63fb193SLi Qiang } 265860ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 265960ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 266060ce86c7SWei Liu fidp->uid, -1, &stbuf); 266160ce86c7SWei Liu if (err < 0) { 266260ce86c7SWei Liu goto out; 266360ce86c7SWei Liu } 266460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 266560ce86c7SWei Liu if (err < 0) { 266660ce86c7SWei Liu goto out; 266760ce86c7SWei Liu } 26685b3c77aaSGreg Kurz v9fs_path_write_lock(s); 266960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26705b3c77aaSGreg Kurz v9fs_path_unlock(s); 267160ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 267260ce86c7SWei Liu if (err < 0) { 267360ce86c7SWei Liu goto out; 267460ce86c7SWei Liu } 267560ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 267660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 267760ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 267860ce86c7SWei Liu extension.data, -1 , &stbuf); 267960ce86c7SWei Liu if (err < 0) { 268060ce86c7SWei Liu goto out; 268160ce86c7SWei Liu } 268260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 268360ce86c7SWei Liu if (err < 0) { 268460ce86c7SWei Liu goto out; 268560ce86c7SWei Liu } 26865b3c77aaSGreg Kurz v9fs_path_write_lock(s); 268760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 26885b3c77aaSGreg Kurz v9fs_path_unlock(s); 268960ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 269060ce86c7SWei Liu int32_t ofid = atoi(extension.data); 269160ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 269260ce86c7SWei Liu if (ofidp == NULL) { 269360ce86c7SWei Liu err = -EINVAL; 269460ce86c7SWei Liu goto out; 269560ce86c7SWei Liu } 269660ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 269760ce86c7SWei Liu put_fid(pdu, ofidp); 269860ce86c7SWei Liu if (err < 0) { 269960ce86c7SWei Liu goto out; 270060ce86c7SWei Liu } 270160ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 270260ce86c7SWei Liu if (err < 0) { 270360ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 270460ce86c7SWei Liu goto out; 270560ce86c7SWei Liu } 27065b3c77aaSGreg Kurz v9fs_path_write_lock(s); 270760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27085b3c77aaSGreg Kurz v9fs_path_unlock(s); 270960ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 271060ce86c7SWei Liu if (err < 0) { 271160ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 271260ce86c7SWei Liu goto out; 271360ce86c7SWei Liu } 271460ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 271560ce86c7SWei Liu char ctype; 271660ce86c7SWei Liu uint32_t major, minor; 271760ce86c7SWei Liu mode_t nmode = 0; 271860ce86c7SWei Liu 271960ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 272060ce86c7SWei Liu err = -errno; 272160ce86c7SWei Liu goto out; 272260ce86c7SWei Liu } 272360ce86c7SWei Liu 272460ce86c7SWei Liu switch (ctype) { 272560ce86c7SWei Liu case 'c': 272660ce86c7SWei Liu nmode = S_IFCHR; 272760ce86c7SWei Liu break; 272860ce86c7SWei Liu case 'b': 272960ce86c7SWei Liu nmode = S_IFBLK; 273060ce86c7SWei Liu break; 273160ce86c7SWei Liu default: 273260ce86c7SWei Liu err = -EIO; 273360ce86c7SWei Liu goto out; 273460ce86c7SWei Liu } 273560ce86c7SWei Liu 273660ce86c7SWei Liu nmode |= perm & 0777; 273760ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 273860ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 273960ce86c7SWei Liu if (err < 0) { 274060ce86c7SWei Liu goto out; 274160ce86c7SWei Liu } 274260ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 274360ce86c7SWei Liu if (err < 0) { 274460ce86c7SWei Liu goto out; 274560ce86c7SWei Liu } 27465b3c77aaSGreg Kurz v9fs_path_write_lock(s); 274760ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27485b3c77aaSGreg Kurz v9fs_path_unlock(s); 274960ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 275060ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 275160ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 275260ce86c7SWei Liu if (err < 0) { 275360ce86c7SWei Liu goto out; 275460ce86c7SWei Liu } 275560ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 275660ce86c7SWei Liu if (err < 0) { 275760ce86c7SWei Liu goto out; 275860ce86c7SWei Liu } 27595b3c77aaSGreg Kurz v9fs_path_write_lock(s); 276060ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27615b3c77aaSGreg Kurz v9fs_path_unlock(s); 276260ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 276360ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 276460ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 276560ce86c7SWei Liu if (err < 0) { 276660ce86c7SWei Liu goto out; 276760ce86c7SWei Liu } 276860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 276960ce86c7SWei Liu if (err < 0) { 277060ce86c7SWei Liu goto out; 277160ce86c7SWei Liu } 27725b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27745b3c77aaSGreg Kurz v9fs_path_unlock(s); 277560ce86c7SWei Liu } else { 277660ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 277760ce86c7SWei Liu omode_to_uflags(mode)|O_CREAT, perm, &stbuf); 277860ce86c7SWei Liu if (err < 0) { 277960ce86c7SWei Liu goto out; 278060ce86c7SWei Liu } 278160ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 278260ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 278360ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 278460ce86c7SWei Liu /* 278560ce86c7SWei Liu * We let the host file system do O_EXCL check 278660ce86c7SWei Liu * We should not reclaim such fd 278760ce86c7SWei Liu */ 278860ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 278960ce86c7SWei Liu } 279060ce86c7SWei Liu } 279160ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 27923b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 27933b5ee9e8SAntonios Motakis if (err < 0) { 27943b5ee9e8SAntonios Motakis goto out; 27953b5ee9e8SAntonios Motakis } 279660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 279760ce86c7SWei Liu if (err < 0) { 279860ce86c7SWei Liu goto out; 279960ce86c7SWei Liu } 280060ce86c7SWei Liu err += offset; 280160ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 280260ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 280360ce86c7SWei Liu out: 280460ce86c7SWei Liu put_fid(pdu, fidp); 280560ce86c7SWei Liu out_nofid: 280660ce86c7SWei Liu pdu_complete(pdu, err); 280760ce86c7SWei Liu v9fs_string_free(&name); 280860ce86c7SWei Liu v9fs_string_free(&extension); 280960ce86c7SWei Liu v9fs_path_free(&path); 281060ce86c7SWei Liu } 281160ce86c7SWei Liu 28128440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 281360ce86c7SWei Liu { 281460ce86c7SWei Liu V9fsPDU *pdu = opaque; 281560ce86c7SWei Liu V9fsString name; 281660ce86c7SWei Liu V9fsString symname; 281760ce86c7SWei Liu V9fsFidState *dfidp; 281860ce86c7SWei Liu V9fsQID qid; 281960ce86c7SWei Liu struct stat stbuf; 282060ce86c7SWei Liu int32_t dfid; 282160ce86c7SWei Liu int err = 0; 282260ce86c7SWei Liu gid_t gid; 282360ce86c7SWei Liu size_t offset = 7; 282460ce86c7SWei Liu 282560ce86c7SWei Liu v9fs_string_init(&name); 282660ce86c7SWei Liu v9fs_string_init(&symname); 282760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 282860ce86c7SWei Liu if (err < 0) { 282960ce86c7SWei Liu goto out_nofid; 283060ce86c7SWei Liu } 283160ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 283260ce86c7SWei Liu 2833fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2834fff39a7aSGreg Kurz err = -ENOENT; 2835fff39a7aSGreg Kurz goto out_nofid; 2836fff39a7aSGreg Kurz } 2837fff39a7aSGreg Kurz 2838805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2839805b5d98SGreg Kurz err = -EEXIST; 2840805b5d98SGreg Kurz goto out_nofid; 2841805b5d98SGreg Kurz } 2842805b5d98SGreg Kurz 284360ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 284460ce86c7SWei Liu if (dfidp == NULL) { 284560ce86c7SWei Liu err = -EINVAL; 284660ce86c7SWei Liu goto out_nofid; 284760ce86c7SWei Liu } 284860ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 284960ce86c7SWei Liu if (err < 0) { 285060ce86c7SWei Liu goto out; 285160ce86c7SWei Liu } 28523b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28533b5ee9e8SAntonios Motakis if (err < 0) { 28543b5ee9e8SAntonios Motakis goto out; 28553b5ee9e8SAntonios Motakis } 285660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 285760ce86c7SWei Liu if (err < 0) { 285860ce86c7SWei Liu goto out; 285960ce86c7SWei Liu } 286060ce86c7SWei Liu err += offset; 286160ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 286260ce86c7SWei Liu qid.type, qid.version, qid.path); 286360ce86c7SWei Liu out: 286460ce86c7SWei Liu put_fid(pdu, dfidp); 286560ce86c7SWei Liu out_nofid: 286660ce86c7SWei Liu pdu_complete(pdu, err); 286760ce86c7SWei Liu v9fs_string_free(&name); 286860ce86c7SWei Liu v9fs_string_free(&symname); 286960ce86c7SWei Liu } 287060ce86c7SWei Liu 2871a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 287260ce86c7SWei Liu { 287360ce86c7SWei Liu ssize_t err; 287460ce86c7SWei Liu int16_t tag; 287560ce86c7SWei Liu size_t offset = 7; 2876d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 287760ce86c7SWei Liu V9fsPDU *pdu = opaque; 287860ce86c7SWei Liu V9fsState *s = pdu->s; 287960ce86c7SWei Liu 288060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 288160ce86c7SWei Liu if (err < 0) { 288260ce86c7SWei Liu pdu_complete(pdu, err); 288360ce86c7SWei Liu return; 288460ce86c7SWei Liu } 288560ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 288660ce86c7SWei Liu 2887d5f2af7bSGreg Kurz if (pdu->tag == tag) { 28883dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2889d5f2af7bSGreg Kurz } else { 289060ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 289160ce86c7SWei Liu if (cancel_pdu->tag == tag) { 289260ce86c7SWei Liu break; 289360ce86c7SWei Liu } 289460ce86c7SWei Liu } 2895d5f2af7bSGreg Kurz } 289660ce86c7SWei Liu if (cancel_pdu) { 289760ce86c7SWei Liu cancel_pdu->cancelled = 1; 289860ce86c7SWei Liu /* 289960ce86c7SWei Liu * Wait for pdu to complete. 290060ce86c7SWei Liu */ 29011ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 290218adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 290360ce86c7SWei Liu cancel_pdu->cancelled = 0; 290460ce86c7SWei Liu pdu_free(cancel_pdu); 290560ce86c7SWei Liu } 290618adde86SGreg Kurz } 290760ce86c7SWei Liu pdu_complete(pdu, 7); 290860ce86c7SWei Liu } 290960ce86c7SWei Liu 29108440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 291160ce86c7SWei Liu { 291260ce86c7SWei Liu V9fsPDU *pdu = opaque; 291360ce86c7SWei Liu int32_t dfid, oldfid; 291460ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 291560ce86c7SWei Liu V9fsString name; 291660ce86c7SWei Liu size_t offset = 7; 291760ce86c7SWei Liu int err = 0; 291860ce86c7SWei Liu 291960ce86c7SWei Liu v9fs_string_init(&name); 292060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 292160ce86c7SWei Liu if (err < 0) { 292260ce86c7SWei Liu goto out_nofid; 292360ce86c7SWei Liu } 292460ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 292560ce86c7SWei Liu 2926fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2927fff39a7aSGreg Kurz err = -ENOENT; 2928fff39a7aSGreg Kurz goto out_nofid; 2929fff39a7aSGreg Kurz } 2930fff39a7aSGreg Kurz 2931805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2932805b5d98SGreg Kurz err = -EEXIST; 2933805b5d98SGreg Kurz goto out_nofid; 2934805b5d98SGreg Kurz } 2935805b5d98SGreg Kurz 293660ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 293760ce86c7SWei Liu if (dfidp == NULL) { 293860ce86c7SWei Liu err = -ENOENT; 293960ce86c7SWei Liu goto out_nofid; 294060ce86c7SWei Liu } 294160ce86c7SWei Liu 294260ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 294360ce86c7SWei Liu if (oldfidp == NULL) { 294460ce86c7SWei Liu err = -ENOENT; 294560ce86c7SWei Liu goto out; 294660ce86c7SWei Liu } 294760ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 294860ce86c7SWei Liu if (!err) { 294960ce86c7SWei Liu err = offset; 295060ce86c7SWei Liu } 29514c158678SLi Qiang put_fid(pdu, oldfidp); 295260ce86c7SWei Liu out: 295360ce86c7SWei Liu put_fid(pdu, dfidp); 295460ce86c7SWei Liu out_nofid: 295560ce86c7SWei Liu v9fs_string_free(&name); 295660ce86c7SWei Liu pdu_complete(pdu, err); 295760ce86c7SWei Liu } 295860ce86c7SWei Liu 295960ce86c7SWei Liu /* Only works with path name based fid */ 29608440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 296160ce86c7SWei Liu { 296260ce86c7SWei Liu int32_t fid; 296360ce86c7SWei Liu int err = 0; 296460ce86c7SWei Liu size_t offset = 7; 296560ce86c7SWei Liu V9fsFidState *fidp; 296660ce86c7SWei Liu V9fsPDU *pdu = opaque; 296760ce86c7SWei Liu 296860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 296960ce86c7SWei Liu if (err < 0) { 297060ce86c7SWei Liu goto out_nofid; 297160ce86c7SWei Liu } 297260ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 297360ce86c7SWei Liu 297460ce86c7SWei Liu fidp = get_fid(pdu, fid); 297560ce86c7SWei Liu if (fidp == NULL) { 297660ce86c7SWei Liu err = -EINVAL; 297760ce86c7SWei Liu goto out_nofid; 297860ce86c7SWei Liu } 297960ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 298060ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 298160ce86c7SWei Liu err = -EOPNOTSUPP; 298260ce86c7SWei Liu goto out_err; 298360ce86c7SWei Liu } 298460ce86c7SWei Liu /* 298560ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 298660ce86c7SWei Liu * the file later. So don't reclaim fd 298760ce86c7SWei Liu */ 298860ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 298960ce86c7SWei Liu if (err < 0) { 299060ce86c7SWei Liu goto out_err; 299160ce86c7SWei Liu } 299260ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 299360ce86c7SWei Liu if (!err) { 299460ce86c7SWei Liu err = offset; 299560ce86c7SWei Liu } 299660ce86c7SWei Liu out_err: 299760ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 299860ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 299960ce86c7SWei Liu put_fid(pdu, fidp); 300060ce86c7SWei Liu out_nofid: 300160ce86c7SWei Liu pdu_complete(pdu, err); 300260ce86c7SWei Liu } 300360ce86c7SWei Liu 30048440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 300560ce86c7SWei Liu { 300660ce86c7SWei Liu int err = 0; 300760ce86c7SWei Liu V9fsString name; 300867e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 300960ce86c7SWei Liu size_t offset = 7; 301060ce86c7SWei Liu V9fsPath path; 301160ce86c7SWei Liu V9fsFidState *dfidp; 301260ce86c7SWei Liu V9fsPDU *pdu = opaque; 301360ce86c7SWei Liu 301460ce86c7SWei Liu v9fs_string_init(&name); 301560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 301660ce86c7SWei Liu if (err < 0) { 301760ce86c7SWei Liu goto out_nofid; 301860ce86c7SWei Liu } 3019fff39a7aSGreg Kurz 3020fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3021fff39a7aSGreg Kurz err = -ENOENT; 3022fff39a7aSGreg Kurz goto out_nofid; 3023fff39a7aSGreg Kurz } 3024fff39a7aSGreg Kurz 3025805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3026805b5d98SGreg Kurz err = -EINVAL; 3027805b5d98SGreg Kurz goto out_nofid; 3028805b5d98SGreg Kurz } 3029805b5d98SGreg Kurz 3030805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3031805b5d98SGreg Kurz err = -ENOTEMPTY; 3032805b5d98SGreg Kurz goto out_nofid; 3033805b5d98SGreg Kurz } 3034805b5d98SGreg Kurz 303567e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 303667e87345SKeno Fischer err = -EINVAL; 303767e87345SKeno Fischer goto out_nofid; 303867e87345SKeno Fischer } 303967e87345SKeno Fischer 304067e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 304167e87345SKeno Fischer rflags |= AT_REMOVEDIR; 304267e87345SKeno Fischer } 304367e87345SKeno Fischer 304460ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 304560ce86c7SWei Liu if (dfidp == NULL) { 304660ce86c7SWei Liu err = -EINVAL; 304760ce86c7SWei Liu goto out_nofid; 304860ce86c7SWei Liu } 304960ce86c7SWei Liu /* 305060ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 305160ce86c7SWei Liu * the file later. So don't reclaim fd 305260ce86c7SWei Liu */ 305360ce86c7SWei Liu v9fs_path_init(&path); 305460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 305560ce86c7SWei Liu if (err < 0) { 305660ce86c7SWei Liu goto out_err; 305760ce86c7SWei Liu } 305860ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 305960ce86c7SWei Liu if (err < 0) { 306060ce86c7SWei Liu goto out_err; 306160ce86c7SWei Liu } 306267e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 306360ce86c7SWei Liu if (!err) { 306460ce86c7SWei Liu err = offset; 306560ce86c7SWei Liu } 306660ce86c7SWei Liu out_err: 306760ce86c7SWei Liu put_fid(pdu, dfidp); 306860ce86c7SWei Liu v9fs_path_free(&path); 306960ce86c7SWei Liu out_nofid: 307060ce86c7SWei Liu pdu_complete(pdu, err); 307160ce86c7SWei Liu v9fs_string_free(&name); 307260ce86c7SWei Liu } 307360ce86c7SWei Liu 307460ce86c7SWei Liu 307560ce86c7SWei Liu /* Only works with path name based fid */ 30768440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 30778440e22eSGreg Kurz int32_t newdirfid, 30788440e22eSGreg Kurz V9fsString *name) 307960ce86c7SWei Liu { 308060ce86c7SWei Liu int err = 0; 308160ce86c7SWei Liu V9fsPath new_path; 308260ce86c7SWei Liu V9fsFidState *tfidp; 308360ce86c7SWei Liu V9fsState *s = pdu->s; 308460ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 308560ce86c7SWei Liu 308660ce86c7SWei Liu v9fs_path_init(&new_path); 308760ce86c7SWei Liu if (newdirfid != -1) { 308860ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 308960ce86c7SWei Liu if (dirfidp == NULL) { 3090b858e80aSDaniel Henrique Barboza return -ENOENT; 309160ce86c7SWei Liu } 309249dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 309349dd946bSGreg Kurz err = -EINVAL; 309449dd946bSGreg Kurz goto out; 309549dd946bSGreg Kurz } 30964fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 30974fa62005SGreg Kurz if (err < 0) { 30984fa62005SGreg Kurz goto out; 30994fa62005SGreg Kurz } 310060ce86c7SWei Liu } else { 31014d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31024d8bc733SJan Dakinevich V9fsPath dir_path; 31034d8bc733SJan Dakinevich 31044d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31054d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31064d8bc733SJan Dakinevich g_free(dir_name); 31074d8bc733SJan Dakinevich 31084d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31094d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31104fa62005SGreg Kurz if (err < 0) { 31114fa62005SGreg Kurz goto out; 31124fa62005SGreg Kurz } 311360ce86c7SWei Liu } 311460ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 311560ce86c7SWei Liu if (err < 0) { 311660ce86c7SWei Liu goto out; 311760ce86c7SWei Liu } 311860ce86c7SWei Liu /* 311960ce86c7SWei Liu * Fixup fid's pointing to the old name to 312060ce86c7SWei Liu * start pointing to the new name 312160ce86c7SWei Liu */ 312260ce86c7SWei Liu for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { 312360ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 312460ce86c7SWei Liu /* replace the name */ 312560ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 312660ce86c7SWei Liu } 312760ce86c7SWei Liu } 312860ce86c7SWei Liu out: 312960ce86c7SWei Liu if (dirfidp) { 313060ce86c7SWei Liu put_fid(pdu, dirfidp); 313160ce86c7SWei Liu } 313260ce86c7SWei Liu v9fs_path_free(&new_path); 313360ce86c7SWei Liu return err; 313460ce86c7SWei Liu } 313560ce86c7SWei Liu 313660ce86c7SWei Liu /* Only works with path name based fid */ 31378440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 313860ce86c7SWei Liu { 313960ce86c7SWei Liu int32_t fid; 314060ce86c7SWei Liu ssize_t err = 0; 314160ce86c7SWei Liu size_t offset = 7; 314260ce86c7SWei Liu V9fsString name; 314360ce86c7SWei Liu int32_t newdirfid; 314460ce86c7SWei Liu V9fsFidState *fidp; 314560ce86c7SWei Liu V9fsPDU *pdu = opaque; 314660ce86c7SWei Liu V9fsState *s = pdu->s; 314760ce86c7SWei Liu 314860ce86c7SWei Liu v9fs_string_init(&name); 314960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 315060ce86c7SWei Liu if (err < 0) { 315160ce86c7SWei Liu goto out_nofid; 315260ce86c7SWei Liu } 3153fff39a7aSGreg Kurz 3154fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3155fff39a7aSGreg Kurz err = -ENOENT; 3156fff39a7aSGreg Kurz goto out_nofid; 3157fff39a7aSGreg Kurz } 3158fff39a7aSGreg Kurz 3159805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3160805b5d98SGreg Kurz err = -EISDIR; 3161805b5d98SGreg Kurz goto out_nofid; 3162805b5d98SGreg Kurz } 3163805b5d98SGreg Kurz 316460ce86c7SWei Liu fidp = get_fid(pdu, fid); 316560ce86c7SWei Liu if (fidp == NULL) { 316660ce86c7SWei Liu err = -ENOENT; 316760ce86c7SWei Liu goto out_nofid; 316860ce86c7SWei Liu } 316949dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 317049dd946bSGreg Kurz err = -EINVAL; 317149dd946bSGreg Kurz goto out; 317249dd946bSGreg Kurz } 317360ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 317460ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 317560ce86c7SWei Liu err = -EOPNOTSUPP; 317660ce86c7SWei Liu goto out; 317760ce86c7SWei Liu } 317860ce86c7SWei Liu v9fs_path_write_lock(s); 317960ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 318060ce86c7SWei Liu v9fs_path_unlock(s); 318160ce86c7SWei Liu if (!err) { 318260ce86c7SWei Liu err = offset; 318360ce86c7SWei Liu } 318460ce86c7SWei Liu out: 318560ce86c7SWei Liu put_fid(pdu, fidp); 318660ce86c7SWei Liu out_nofid: 318760ce86c7SWei Liu pdu_complete(pdu, err); 318860ce86c7SWei Liu v9fs_string_free(&name); 318960ce86c7SWei Liu } 319060ce86c7SWei Liu 31914fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 31928440e22eSGreg Kurz V9fsString *old_name, 31938440e22eSGreg Kurz V9fsPath *newdir, 319460ce86c7SWei Liu V9fsString *new_name) 319560ce86c7SWei Liu { 319660ce86c7SWei Liu V9fsFidState *tfidp; 319760ce86c7SWei Liu V9fsPath oldpath, newpath; 319860ce86c7SWei Liu V9fsState *s = pdu->s; 31994fa62005SGreg Kurz int err; 320060ce86c7SWei Liu 320160ce86c7SWei Liu v9fs_path_init(&oldpath); 320260ce86c7SWei Liu v9fs_path_init(&newpath); 32034fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32044fa62005SGreg Kurz if (err < 0) { 32054fa62005SGreg Kurz goto out; 32064fa62005SGreg Kurz } 32074fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32084fa62005SGreg Kurz if (err < 0) { 32094fa62005SGreg Kurz goto out; 32104fa62005SGreg Kurz } 321160ce86c7SWei Liu 321260ce86c7SWei Liu /* 321360ce86c7SWei Liu * Fixup fid's pointing to the old name to 321460ce86c7SWei Liu * start pointing to the new name 321560ce86c7SWei Liu */ 321660ce86c7SWei Liu for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { 321760ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 321860ce86c7SWei Liu /* replace the name */ 321960ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 322060ce86c7SWei Liu } 322160ce86c7SWei Liu } 32224fa62005SGreg Kurz out: 322360ce86c7SWei Liu v9fs_path_free(&oldpath); 322460ce86c7SWei Liu v9fs_path_free(&newpath); 32254fa62005SGreg Kurz return err; 322660ce86c7SWei Liu } 322760ce86c7SWei Liu 32288440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 32298440e22eSGreg Kurz V9fsString *old_name, 32308440e22eSGreg Kurz int32_t newdirfid, 323160ce86c7SWei Liu V9fsString *new_name) 323260ce86c7SWei Liu { 323360ce86c7SWei Liu int err = 0; 323460ce86c7SWei Liu V9fsState *s = pdu->s; 323560ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 323660ce86c7SWei Liu 323760ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 323860ce86c7SWei Liu if (olddirfidp == NULL) { 323960ce86c7SWei Liu err = -ENOENT; 324060ce86c7SWei Liu goto out; 324160ce86c7SWei Liu } 324260ce86c7SWei Liu if (newdirfid != -1) { 324360ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 324460ce86c7SWei Liu if (newdirfidp == NULL) { 324560ce86c7SWei Liu err = -ENOENT; 324660ce86c7SWei Liu goto out; 324760ce86c7SWei Liu } 324860ce86c7SWei Liu } else { 324960ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 325060ce86c7SWei Liu } 325160ce86c7SWei Liu 325260ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 325360ce86c7SWei Liu &newdirfidp->path, new_name); 325460ce86c7SWei Liu if (err < 0) { 325560ce86c7SWei Liu goto out; 325660ce86c7SWei Liu } 325760ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 325860ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 32594fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 326060ce86c7SWei Liu &newdirfidp->path, new_name); 326160ce86c7SWei Liu } 326260ce86c7SWei Liu out: 326360ce86c7SWei Liu if (olddirfidp) { 326460ce86c7SWei Liu put_fid(pdu, olddirfidp); 326560ce86c7SWei Liu } 326660ce86c7SWei Liu if (newdirfidp) { 326760ce86c7SWei Liu put_fid(pdu, newdirfidp); 326860ce86c7SWei Liu } 326960ce86c7SWei Liu return err; 327060ce86c7SWei Liu } 327160ce86c7SWei Liu 32728440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 327360ce86c7SWei Liu { 327460ce86c7SWei Liu ssize_t err = 0; 327560ce86c7SWei Liu size_t offset = 7; 327660ce86c7SWei Liu V9fsPDU *pdu = opaque; 327760ce86c7SWei Liu V9fsState *s = pdu->s; 327860ce86c7SWei Liu int32_t olddirfid, newdirfid; 327960ce86c7SWei Liu V9fsString old_name, new_name; 328060ce86c7SWei Liu 328160ce86c7SWei Liu v9fs_string_init(&old_name); 328260ce86c7SWei Liu v9fs_string_init(&new_name); 328360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 328460ce86c7SWei Liu &old_name, &newdirfid, &new_name); 328560ce86c7SWei Liu if (err < 0) { 328660ce86c7SWei Liu goto out_err; 328760ce86c7SWei Liu } 328860ce86c7SWei Liu 3289fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3290fff39a7aSGreg Kurz err = -ENOENT; 3291fff39a7aSGreg Kurz goto out_err; 3292fff39a7aSGreg Kurz } 3293fff39a7aSGreg Kurz 3294805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3295805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3296805b5d98SGreg Kurz err = -EISDIR; 3297805b5d98SGreg Kurz goto out_err; 3298805b5d98SGreg Kurz } 3299805b5d98SGreg Kurz 330060ce86c7SWei Liu v9fs_path_write_lock(s); 330160ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 330260ce86c7SWei Liu &old_name, newdirfid, &new_name); 330360ce86c7SWei Liu v9fs_path_unlock(s); 330460ce86c7SWei Liu if (!err) { 330560ce86c7SWei Liu err = offset; 330660ce86c7SWei Liu } 330760ce86c7SWei Liu 330860ce86c7SWei Liu out_err: 330960ce86c7SWei Liu pdu_complete(pdu, err); 331060ce86c7SWei Liu v9fs_string_free(&old_name); 331160ce86c7SWei Liu v9fs_string_free(&new_name); 331260ce86c7SWei Liu } 331360ce86c7SWei Liu 33148440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 331560ce86c7SWei Liu { 331660ce86c7SWei Liu int32_t fid; 331760ce86c7SWei Liu int err = 0; 331860ce86c7SWei Liu int16_t unused; 331960ce86c7SWei Liu V9fsStat v9stat; 332060ce86c7SWei Liu size_t offset = 7; 332160ce86c7SWei Liu struct stat stbuf; 332260ce86c7SWei Liu V9fsFidState *fidp; 332360ce86c7SWei Liu V9fsPDU *pdu = opaque; 33241d203986SGreg Kurz V9fsState *s = pdu->s; 332560ce86c7SWei Liu 332660ce86c7SWei Liu v9fs_stat_init(&v9stat); 332760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 332860ce86c7SWei Liu if (err < 0) { 332960ce86c7SWei Liu goto out_nofid; 333060ce86c7SWei Liu } 333160ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 333260ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 333360ce86c7SWei Liu 333460ce86c7SWei Liu fidp = get_fid(pdu, fid); 333560ce86c7SWei Liu if (fidp == NULL) { 333660ce86c7SWei Liu err = -EINVAL; 333760ce86c7SWei Liu goto out_nofid; 333860ce86c7SWei Liu } 333960ce86c7SWei Liu /* do we need to sync the file? */ 334060ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 334160ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 334260ce86c7SWei Liu goto out; 334360ce86c7SWei Liu } 334460ce86c7SWei Liu if (v9stat.mode != -1) { 334560ce86c7SWei Liu uint32_t v9_mode; 334660ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 334760ce86c7SWei Liu if (err < 0) { 334860ce86c7SWei Liu goto out; 334960ce86c7SWei Liu } 335060ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 335160ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 335260ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 335360ce86c7SWei Liu /* Attempting to change the type */ 335460ce86c7SWei Liu err = -EIO; 335560ce86c7SWei Liu goto out; 335660ce86c7SWei Liu } 335760ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 335860ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 335960ce86c7SWei Liu &v9stat.extension)); 336060ce86c7SWei Liu if (err < 0) { 336160ce86c7SWei Liu goto out; 336260ce86c7SWei Liu } 336360ce86c7SWei Liu } 336460ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 336560ce86c7SWei Liu struct timespec times[2]; 336660ce86c7SWei Liu if (v9stat.atime != -1) { 336760ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 336860ce86c7SWei Liu times[0].tv_nsec = 0; 336960ce86c7SWei Liu } else { 337060ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 337160ce86c7SWei Liu } 337260ce86c7SWei Liu if (v9stat.mtime != -1) { 337360ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 337460ce86c7SWei Liu times[1].tv_nsec = 0; 337560ce86c7SWei Liu } else { 337660ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 337760ce86c7SWei Liu } 337860ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 337960ce86c7SWei Liu if (err < 0) { 338060ce86c7SWei Liu goto out; 338160ce86c7SWei Liu } 338260ce86c7SWei Liu } 338360ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 338460ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 338560ce86c7SWei Liu if (err < 0) { 338660ce86c7SWei Liu goto out; 338760ce86c7SWei Liu } 338860ce86c7SWei Liu } 338960ce86c7SWei Liu if (v9stat.name.size != 0) { 33901d203986SGreg Kurz v9fs_path_write_lock(s); 339160ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 33921d203986SGreg Kurz v9fs_path_unlock(s); 339360ce86c7SWei Liu if (err < 0) { 339460ce86c7SWei Liu goto out; 339560ce86c7SWei Liu } 339660ce86c7SWei Liu } 339760ce86c7SWei Liu if (v9stat.length != -1) { 339860ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 339960ce86c7SWei Liu if (err < 0) { 340060ce86c7SWei Liu goto out; 340160ce86c7SWei Liu } 340260ce86c7SWei Liu } 340360ce86c7SWei Liu err = offset; 340460ce86c7SWei Liu out: 340560ce86c7SWei Liu put_fid(pdu, fidp); 340660ce86c7SWei Liu out_nofid: 340760ce86c7SWei Liu v9fs_stat_free(&v9stat); 340860ce86c7SWei Liu pdu_complete(pdu, err); 340960ce86c7SWei Liu } 341060ce86c7SWei Liu 341160ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 341260ce86c7SWei Liu { 341360ce86c7SWei Liu uint32_t f_type; 341460ce86c7SWei Liu uint32_t f_bsize; 341560ce86c7SWei Liu uint64_t f_blocks; 341660ce86c7SWei Liu uint64_t f_bfree; 341760ce86c7SWei Liu uint64_t f_bavail; 341860ce86c7SWei Liu uint64_t f_files; 341960ce86c7SWei Liu uint64_t f_ffree; 342060ce86c7SWei Liu uint64_t fsid_val; 342160ce86c7SWei Liu uint32_t f_namelen; 342260ce86c7SWei Liu size_t offset = 7; 342360ce86c7SWei Liu int32_t bsize_factor; 342460ce86c7SWei Liu 342560ce86c7SWei Liu /* 342660ce86c7SWei Liu * compute bsize factor based on host file system block size 342760ce86c7SWei Liu * and client msize 342860ce86c7SWei Liu */ 342960ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize; 343060ce86c7SWei Liu if (!bsize_factor) { 343160ce86c7SWei Liu bsize_factor = 1; 343260ce86c7SWei Liu } 343360ce86c7SWei Liu f_type = stbuf->f_type; 343460ce86c7SWei Liu f_bsize = stbuf->f_bsize; 343560ce86c7SWei Liu f_bsize *= bsize_factor; 343660ce86c7SWei Liu /* 343760ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 343860ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 343960ce86c7SWei Liu * blocks by bsize factor 344060ce86c7SWei Liu */ 344160ce86c7SWei Liu f_blocks = stbuf->f_blocks/bsize_factor; 344260ce86c7SWei Liu f_bfree = stbuf->f_bfree/bsize_factor; 344360ce86c7SWei Liu f_bavail = stbuf->f_bavail/bsize_factor; 344460ce86c7SWei Liu f_files = stbuf->f_files; 344560ce86c7SWei Liu f_ffree = stbuf->f_ffree; 344660ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 344760ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 344860ce86c7SWei Liu f_namelen = stbuf->f_namelen; 344960ce86c7SWei Liu 345060ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 345160ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 345260ce86c7SWei Liu f_bavail, f_files, f_ffree, 345360ce86c7SWei Liu fsid_val, f_namelen); 345460ce86c7SWei Liu } 345560ce86c7SWei Liu 34568440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 345760ce86c7SWei Liu { 345860ce86c7SWei Liu int32_t fid; 345960ce86c7SWei Liu ssize_t retval = 0; 346060ce86c7SWei Liu size_t offset = 7; 346160ce86c7SWei Liu V9fsFidState *fidp; 346260ce86c7SWei Liu struct statfs stbuf; 346360ce86c7SWei Liu V9fsPDU *pdu = opaque; 346460ce86c7SWei Liu V9fsState *s = pdu->s; 346560ce86c7SWei Liu 346660ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 346760ce86c7SWei Liu if (retval < 0) { 346860ce86c7SWei Liu goto out_nofid; 346960ce86c7SWei Liu } 347060ce86c7SWei Liu fidp = get_fid(pdu, fid); 347160ce86c7SWei Liu if (fidp == NULL) { 347260ce86c7SWei Liu retval = -ENOENT; 347360ce86c7SWei Liu goto out_nofid; 347460ce86c7SWei Liu } 347560ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 347660ce86c7SWei Liu if (retval < 0) { 347760ce86c7SWei Liu goto out; 347860ce86c7SWei Liu } 347960ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 348060ce86c7SWei Liu if (retval < 0) { 348160ce86c7SWei Liu goto out; 348260ce86c7SWei Liu } 348360ce86c7SWei Liu retval += offset; 348460ce86c7SWei Liu out: 348560ce86c7SWei Liu put_fid(pdu, fidp); 348660ce86c7SWei Liu out_nofid: 348760ce86c7SWei Liu pdu_complete(pdu, retval); 348860ce86c7SWei Liu } 348960ce86c7SWei Liu 34908440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 349160ce86c7SWei Liu { 349260ce86c7SWei Liu 349360ce86c7SWei Liu int mode; 349460ce86c7SWei Liu gid_t gid; 349560ce86c7SWei Liu int32_t fid; 349660ce86c7SWei Liu V9fsQID qid; 349760ce86c7SWei Liu int err = 0; 349860ce86c7SWei Liu int major, minor; 349960ce86c7SWei Liu size_t offset = 7; 350060ce86c7SWei Liu V9fsString name; 350160ce86c7SWei Liu struct stat stbuf; 350260ce86c7SWei Liu V9fsFidState *fidp; 350360ce86c7SWei Liu V9fsPDU *pdu = opaque; 350460ce86c7SWei Liu 350560ce86c7SWei Liu v9fs_string_init(&name); 350660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 350760ce86c7SWei Liu &major, &minor, &gid); 350860ce86c7SWei Liu if (err < 0) { 350960ce86c7SWei Liu goto out_nofid; 351060ce86c7SWei Liu } 351160ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 351260ce86c7SWei Liu 3513fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3514fff39a7aSGreg Kurz err = -ENOENT; 3515fff39a7aSGreg Kurz goto out_nofid; 3516fff39a7aSGreg Kurz } 3517fff39a7aSGreg Kurz 3518805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3519805b5d98SGreg Kurz err = -EEXIST; 3520805b5d98SGreg Kurz goto out_nofid; 3521805b5d98SGreg Kurz } 3522805b5d98SGreg Kurz 352360ce86c7SWei Liu fidp = get_fid(pdu, fid); 352460ce86c7SWei Liu if (fidp == NULL) { 352560ce86c7SWei Liu err = -ENOENT; 352660ce86c7SWei Liu goto out_nofid; 352760ce86c7SWei Liu } 352860ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 352960ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 353060ce86c7SWei Liu if (err < 0) { 353160ce86c7SWei Liu goto out; 353260ce86c7SWei Liu } 35333b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 35343b5ee9e8SAntonios Motakis if (err < 0) { 35353b5ee9e8SAntonios Motakis goto out; 35363b5ee9e8SAntonios Motakis } 353760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 353860ce86c7SWei Liu if (err < 0) { 353960ce86c7SWei Liu goto out; 354060ce86c7SWei Liu } 354160ce86c7SWei Liu err += offset; 354260ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 354360ce86c7SWei Liu qid.type, qid.version, qid.path); 354460ce86c7SWei Liu out: 354560ce86c7SWei Liu put_fid(pdu, fidp); 354660ce86c7SWei Liu out_nofid: 354760ce86c7SWei Liu pdu_complete(pdu, err); 354860ce86c7SWei Liu v9fs_string_free(&name); 354960ce86c7SWei Liu } 355060ce86c7SWei Liu 355160ce86c7SWei Liu /* 355260ce86c7SWei Liu * Implement posix byte range locking code 355360ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 355460ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 355560ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 355660ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 355760ce86c7SWei Liu * So when a TLOCK request comes, always return success 355860ce86c7SWei Liu */ 35598440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 356060ce86c7SWei Liu { 356160ce86c7SWei Liu V9fsFlock flock; 356260ce86c7SWei Liu size_t offset = 7; 356360ce86c7SWei Liu struct stat stbuf; 356460ce86c7SWei Liu V9fsFidState *fidp; 356560ce86c7SWei Liu int32_t fid, err = 0; 356660ce86c7SWei Liu V9fsPDU *pdu = opaque; 356760ce86c7SWei Liu 356860ce86c7SWei Liu v9fs_string_init(&flock.client_id); 356960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 357060ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 357160ce86c7SWei Liu &flock.proc_id, &flock.client_id); 357260ce86c7SWei Liu if (err < 0) { 357360ce86c7SWei Liu goto out_nofid; 357460ce86c7SWei Liu } 357560ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 357660ce86c7SWei Liu flock.type, flock.start, flock.length); 357760ce86c7SWei Liu 357860ce86c7SWei Liu 357960ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 358060ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 358160ce86c7SWei Liu err = -EINVAL; 358260ce86c7SWei Liu goto out_nofid; 358360ce86c7SWei Liu } 358460ce86c7SWei Liu fidp = get_fid(pdu, fid); 358560ce86c7SWei Liu if (fidp == NULL) { 358660ce86c7SWei Liu err = -ENOENT; 358760ce86c7SWei Liu goto out_nofid; 358860ce86c7SWei Liu } 358960ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 359060ce86c7SWei Liu if (err < 0) { 359160ce86c7SWei Liu goto out; 359260ce86c7SWei Liu } 35934bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 35944bae2b39SPaolo Bonzini if (err < 0) { 35954bae2b39SPaolo Bonzini goto out; 35964bae2b39SPaolo Bonzini } 35974bae2b39SPaolo Bonzini err += offset; 35984bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 359960ce86c7SWei Liu out: 360060ce86c7SWei Liu put_fid(pdu, fidp); 360160ce86c7SWei Liu out_nofid: 360260ce86c7SWei Liu pdu_complete(pdu, err); 360360ce86c7SWei Liu v9fs_string_free(&flock.client_id); 360460ce86c7SWei Liu } 360560ce86c7SWei Liu 360660ce86c7SWei Liu /* 360760ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 360860ce86c7SWei Liu * handling is done by client's VFS layer. 360960ce86c7SWei Liu */ 36108440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 361160ce86c7SWei Liu { 361260ce86c7SWei Liu size_t offset = 7; 361360ce86c7SWei Liu struct stat stbuf; 361460ce86c7SWei Liu V9fsFidState *fidp; 361560ce86c7SWei Liu V9fsGetlock glock; 361660ce86c7SWei Liu int32_t fid, err = 0; 361760ce86c7SWei Liu V9fsPDU *pdu = opaque; 361860ce86c7SWei Liu 361960ce86c7SWei Liu v9fs_string_init(&glock.client_id); 362060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 362160ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 362260ce86c7SWei Liu &glock.client_id); 362360ce86c7SWei Liu if (err < 0) { 362460ce86c7SWei Liu goto out_nofid; 362560ce86c7SWei Liu } 362660ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 362760ce86c7SWei Liu glock.type, glock.start, glock.length); 362860ce86c7SWei Liu 362960ce86c7SWei Liu fidp = get_fid(pdu, fid); 363060ce86c7SWei Liu if (fidp == NULL) { 363160ce86c7SWei Liu err = -ENOENT; 363260ce86c7SWei Liu goto out_nofid; 363360ce86c7SWei Liu } 363460ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 363560ce86c7SWei Liu if (err < 0) { 363660ce86c7SWei Liu goto out; 363760ce86c7SWei Liu } 363860ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 363960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 364060ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 364160ce86c7SWei Liu &glock.client_id); 364260ce86c7SWei Liu if (err < 0) { 364360ce86c7SWei Liu goto out; 364460ce86c7SWei Liu } 364560ce86c7SWei Liu err += offset; 364660ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 364760ce86c7SWei Liu glock.length, glock.proc_id); 364860ce86c7SWei Liu out: 364960ce86c7SWei Liu put_fid(pdu, fidp); 365060ce86c7SWei Liu out_nofid: 365160ce86c7SWei Liu pdu_complete(pdu, err); 365260ce86c7SWei Liu v9fs_string_free(&glock.client_id); 365360ce86c7SWei Liu } 365460ce86c7SWei Liu 36558440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 365660ce86c7SWei Liu { 365760ce86c7SWei Liu V9fsPDU *pdu = opaque; 365860ce86c7SWei Liu size_t offset = 7; 365960ce86c7SWei Liu int32_t fid; 366060ce86c7SWei Liu struct stat stbuf; 366160ce86c7SWei Liu V9fsQID qid; 366260ce86c7SWei Liu V9fsString name; 366360ce86c7SWei Liu V9fsFidState *fidp; 366460ce86c7SWei Liu gid_t gid; 366560ce86c7SWei Liu int mode; 366660ce86c7SWei Liu int err = 0; 366760ce86c7SWei Liu 366860ce86c7SWei Liu v9fs_string_init(&name); 366960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 367060ce86c7SWei Liu if (err < 0) { 367160ce86c7SWei Liu goto out_nofid; 367260ce86c7SWei Liu } 367360ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 367460ce86c7SWei Liu 3675fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3676fff39a7aSGreg Kurz err = -ENOENT; 3677fff39a7aSGreg Kurz goto out_nofid; 3678fff39a7aSGreg Kurz } 3679fff39a7aSGreg Kurz 3680805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3681805b5d98SGreg Kurz err = -EEXIST; 3682805b5d98SGreg Kurz goto out_nofid; 3683805b5d98SGreg Kurz } 3684805b5d98SGreg Kurz 368560ce86c7SWei Liu fidp = get_fid(pdu, fid); 368660ce86c7SWei Liu if (fidp == NULL) { 368760ce86c7SWei Liu err = -ENOENT; 368860ce86c7SWei Liu goto out_nofid; 368960ce86c7SWei Liu } 369060ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 369160ce86c7SWei Liu if (err < 0) { 369260ce86c7SWei Liu goto out; 369360ce86c7SWei Liu } 36943b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36953b5ee9e8SAntonios Motakis if (err < 0) { 36963b5ee9e8SAntonios Motakis goto out; 36973b5ee9e8SAntonios Motakis } 369860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 369960ce86c7SWei Liu if (err < 0) { 370060ce86c7SWei Liu goto out; 370160ce86c7SWei Liu } 370260ce86c7SWei Liu err += offset; 370360ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 370460ce86c7SWei Liu qid.type, qid.version, qid.path, err); 370560ce86c7SWei Liu out: 370660ce86c7SWei Liu put_fid(pdu, fidp); 370760ce86c7SWei Liu out_nofid: 370860ce86c7SWei Liu pdu_complete(pdu, err); 370960ce86c7SWei Liu v9fs_string_free(&name); 371060ce86c7SWei Liu } 371160ce86c7SWei Liu 37128440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 371360ce86c7SWei Liu { 371460ce86c7SWei Liu int64_t size; 371560ce86c7SWei Liu V9fsString name; 371660ce86c7SWei Liu ssize_t err = 0; 371760ce86c7SWei Liu size_t offset = 7; 371860ce86c7SWei Liu int32_t fid, newfid; 371960ce86c7SWei Liu V9fsFidState *file_fidp; 372060ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 372160ce86c7SWei Liu V9fsPDU *pdu = opaque; 372260ce86c7SWei Liu V9fsState *s = pdu->s; 372360ce86c7SWei Liu 372460ce86c7SWei Liu v9fs_string_init(&name); 372560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 372660ce86c7SWei Liu if (err < 0) { 372760ce86c7SWei Liu goto out_nofid; 372860ce86c7SWei Liu } 372960ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 373060ce86c7SWei Liu 373160ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 373260ce86c7SWei Liu if (file_fidp == NULL) { 373360ce86c7SWei Liu err = -ENOENT; 373460ce86c7SWei Liu goto out_nofid; 373560ce86c7SWei Liu } 373660ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 373760ce86c7SWei Liu if (xattr_fidp == NULL) { 373860ce86c7SWei Liu err = -EINVAL; 373960ce86c7SWei Liu goto out; 374060ce86c7SWei Liu } 374160ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3742ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 374360ce86c7SWei Liu /* 374460ce86c7SWei Liu * listxattr request. Get the size first 374560ce86c7SWei Liu */ 374660ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 374760ce86c7SWei Liu if (size < 0) { 374860ce86c7SWei Liu err = size; 374960ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 375060ce86c7SWei Liu goto out; 375160ce86c7SWei Liu } 375260ce86c7SWei Liu /* 375360ce86c7SWei Liu * Read the xattr value 375460ce86c7SWei Liu */ 375560ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 375660ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3757dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37587bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3759a647502cSKeno Fischer if (size) { 376060ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 376160ce86c7SWei Liu xattr_fidp->fs.xattr.value, 376260ce86c7SWei Liu xattr_fidp->fs.xattr.len); 376360ce86c7SWei Liu if (err < 0) { 376460ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 376560ce86c7SWei Liu goto out; 376660ce86c7SWei Liu } 376760ce86c7SWei Liu } 376860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 376960ce86c7SWei Liu if (err < 0) { 377060ce86c7SWei Liu goto out; 377160ce86c7SWei Liu } 377260ce86c7SWei Liu err += offset; 377360ce86c7SWei Liu } else { 377460ce86c7SWei Liu /* 377560ce86c7SWei Liu * specific xattr fid. We check for xattr 377660ce86c7SWei Liu * presence also collect the xattr size 377760ce86c7SWei Liu */ 377860ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 377960ce86c7SWei Liu &name, NULL, 0); 378060ce86c7SWei Liu if (size < 0) { 378160ce86c7SWei Liu err = size; 378260ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 378360ce86c7SWei Liu goto out; 378460ce86c7SWei Liu } 378560ce86c7SWei Liu /* 378660ce86c7SWei Liu * Read the xattr value 378760ce86c7SWei Liu */ 378860ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 378960ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3790dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 37917bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3792a647502cSKeno Fischer if (size) { 379360ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 379460ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 379560ce86c7SWei Liu xattr_fidp->fs.xattr.len); 379660ce86c7SWei Liu if (err < 0) { 379760ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 379860ce86c7SWei Liu goto out; 379960ce86c7SWei Liu } 380060ce86c7SWei Liu } 380160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 380260ce86c7SWei Liu if (err < 0) { 380360ce86c7SWei Liu goto out; 380460ce86c7SWei Liu } 380560ce86c7SWei Liu err += offset; 380660ce86c7SWei Liu } 380760ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 380860ce86c7SWei Liu out: 380960ce86c7SWei Liu put_fid(pdu, file_fidp); 381060ce86c7SWei Liu if (xattr_fidp) { 381160ce86c7SWei Liu put_fid(pdu, xattr_fidp); 381260ce86c7SWei Liu } 381360ce86c7SWei Liu out_nofid: 381460ce86c7SWei Liu pdu_complete(pdu, err); 381560ce86c7SWei Liu v9fs_string_free(&name); 381660ce86c7SWei Liu } 381760ce86c7SWei Liu 38188440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 381960ce86c7SWei Liu { 3820aca6897fSKeno Fischer int flags, rflags = 0; 382160ce86c7SWei Liu int32_t fid; 38223b79ef2cSGreg Kurz uint64_t size; 382360ce86c7SWei Liu ssize_t err = 0; 382460ce86c7SWei Liu V9fsString name; 382560ce86c7SWei Liu size_t offset = 7; 382660ce86c7SWei Liu V9fsFidState *file_fidp; 382760ce86c7SWei Liu V9fsFidState *xattr_fidp; 382860ce86c7SWei Liu V9fsPDU *pdu = opaque; 382960ce86c7SWei Liu 383060ce86c7SWei Liu v9fs_string_init(&name); 383160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 383260ce86c7SWei Liu if (err < 0) { 383360ce86c7SWei Liu goto out_nofid; 383460ce86c7SWei Liu } 383560ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 383660ce86c7SWei Liu 3837aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3838aca6897fSKeno Fischer err = -EINVAL; 3839aca6897fSKeno Fischer goto out_nofid; 3840aca6897fSKeno Fischer } 3841aca6897fSKeno Fischer 3842aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3843aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3844aca6897fSKeno Fischer } 3845aca6897fSKeno Fischer 3846aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3847aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3848aca6897fSKeno Fischer } 3849aca6897fSKeno Fischer 38503b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 38513b79ef2cSGreg Kurz err = -E2BIG; 38523b79ef2cSGreg Kurz goto out_nofid; 38533b79ef2cSGreg Kurz } 38543b79ef2cSGreg Kurz 385560ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 385660ce86c7SWei Liu if (file_fidp == NULL) { 385760ce86c7SWei Liu err = -EINVAL; 385860ce86c7SWei Liu goto out_nofid; 385960ce86c7SWei Liu } 3860dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3861dd654e03SGreg Kurz err = -EINVAL; 3862dd654e03SGreg Kurz goto out_put_fid; 3863dd654e03SGreg Kurz } 3864dd654e03SGreg Kurz 386560ce86c7SWei Liu /* Make the file fid point to xattr */ 386660ce86c7SWei Liu xattr_fidp = file_fidp; 386760ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 386860ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3869dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 387060ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3871aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 387260ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 387360ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3874eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 387560ce86c7SWei Liu err = offset; 3876dd654e03SGreg Kurz out_put_fid: 387760ce86c7SWei Liu put_fid(pdu, file_fidp); 387860ce86c7SWei Liu out_nofid: 387960ce86c7SWei Liu pdu_complete(pdu, err); 388060ce86c7SWei Liu v9fs_string_free(&name); 388160ce86c7SWei Liu } 388260ce86c7SWei Liu 38838440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 388460ce86c7SWei Liu { 388560ce86c7SWei Liu V9fsPDU *pdu = opaque; 388660ce86c7SWei Liu size_t offset = 7; 388760ce86c7SWei Liu V9fsString target; 388860ce86c7SWei Liu int32_t fid; 388960ce86c7SWei Liu int err = 0; 389060ce86c7SWei Liu V9fsFidState *fidp; 389160ce86c7SWei Liu 389260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 389360ce86c7SWei Liu if (err < 0) { 389460ce86c7SWei Liu goto out_nofid; 389560ce86c7SWei Liu } 389660ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 389760ce86c7SWei Liu fidp = get_fid(pdu, fid); 389860ce86c7SWei Liu if (fidp == NULL) { 389960ce86c7SWei Liu err = -ENOENT; 390060ce86c7SWei Liu goto out_nofid; 390160ce86c7SWei Liu } 390260ce86c7SWei Liu 390360ce86c7SWei Liu v9fs_string_init(&target); 390460ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 390560ce86c7SWei Liu if (err < 0) { 390660ce86c7SWei Liu goto out; 390760ce86c7SWei Liu } 390860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 390960ce86c7SWei Liu if (err < 0) { 391060ce86c7SWei Liu v9fs_string_free(&target); 391160ce86c7SWei Liu goto out; 391260ce86c7SWei Liu } 391360ce86c7SWei Liu err += offset; 391460ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 391560ce86c7SWei Liu v9fs_string_free(&target); 391660ce86c7SWei Liu out: 391760ce86c7SWei Liu put_fid(pdu, fidp); 391860ce86c7SWei Liu out_nofid: 391960ce86c7SWei Liu pdu_complete(pdu, err); 392060ce86c7SWei Liu } 392160ce86c7SWei Liu 392260ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 392360ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 392460ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 392560ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 392660ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 392760ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 392860ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 392960ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 393060ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 393160ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 393260ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 393360ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 393460ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 393560ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 393660ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 393760ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 393860ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 393960ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 394060ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 394160ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 394260ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 394360ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 394460ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 394560ce86c7SWei Liu [P9_TREAD] = v9fs_read, 394660ce86c7SWei Liu #if 0 394760ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 394860ce86c7SWei Liu #endif 394960ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 395060ce86c7SWei Liu [P9_TLINK] = v9fs_link, 395160ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 395260ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 395360ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 395460ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 395560ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 395660ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 395760ce86c7SWei Liu }; 395860ce86c7SWei Liu 39598440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 396060ce86c7SWei Liu { 396160ce86c7SWei Liu V9fsPDU *pdu = opaque; 396260ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 396360ce86c7SWei Liu } 396460ce86c7SWei Liu 39658440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 396660ce86c7SWei Liu { 396760ce86c7SWei Liu V9fsPDU *pdu = opaque; 396860ce86c7SWei Liu pdu_complete(pdu, -EROFS); 396960ce86c7SWei Liu } 397060ce86c7SWei Liu 397160ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 397260ce86c7SWei Liu { 397360ce86c7SWei Liu switch (pdu->id) { 397460ce86c7SWei Liu case P9_TREADDIR: 397560ce86c7SWei Liu case P9_TSTATFS: 397660ce86c7SWei Liu case P9_TGETATTR: 397760ce86c7SWei Liu case P9_TXATTRWALK: 397860ce86c7SWei Liu case P9_TLOCK: 397960ce86c7SWei Liu case P9_TGETLOCK: 398060ce86c7SWei Liu case P9_TREADLINK: 398160ce86c7SWei Liu case P9_TVERSION: 398260ce86c7SWei Liu case P9_TLOPEN: 398360ce86c7SWei Liu case P9_TATTACH: 398460ce86c7SWei Liu case P9_TSTAT: 398560ce86c7SWei Liu case P9_TWALK: 398660ce86c7SWei Liu case P9_TCLUNK: 398760ce86c7SWei Liu case P9_TFSYNC: 398860ce86c7SWei Liu case P9_TOPEN: 398960ce86c7SWei Liu case P9_TREAD: 399060ce86c7SWei Liu case P9_TAUTH: 399160ce86c7SWei Liu case P9_TFLUSH: 399260ce86c7SWei Liu return 1; 399360ce86c7SWei Liu default: 399460ce86c7SWei Liu return 0; 399560ce86c7SWei Liu } 399660ce86c7SWei Liu } 399760ce86c7SWei Liu 3998506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 399960ce86c7SWei Liu { 400060ce86c7SWei Liu Coroutine *co; 400160ce86c7SWei Liu CoroutineEntry *handler; 400260ce86c7SWei Liu V9fsState *s = pdu->s; 400360ce86c7SWei Liu 4004506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4005506f3275SGreg Kurz pdu->id = hdr->id; 4006506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4007506f3275SGreg Kurz 400860ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 400960ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 401060ce86c7SWei Liu handler = v9fs_op_not_supp; 4011d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4012d1471233SGreg Kurz handler = v9fs_fs_ro; 401360ce86c7SWei Liu } else { 401460ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 401560ce86c7SWei Liu } 401660ce86c7SWei Liu 4017506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 40180b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 40190b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 402060ce86c7SWei Liu } 402160ce86c7SWei Liu 40222a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4023066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4024066eb006SGreg Kurz Error **errp) 40252a0c56aaSWei Liu { 40262a0c56aaSWei Liu int i, len; 40272a0c56aaSWei Liu struct stat stat; 40282a0c56aaSWei Liu FsDriverEntry *fse; 40292a0c56aaSWei Liu V9fsPath path; 40302a0c56aaSWei Liu int rc = 1; 40312a0c56aaSWei Liu 4032066eb006SGreg Kurz assert(!s->transport); 4033066eb006SGreg Kurz s->transport = t; 4034066eb006SGreg Kurz 40352a0c56aaSWei Liu /* initialize pdu allocator */ 40362a0c56aaSWei Liu QLIST_INIT(&s->free_list); 40372a0c56aaSWei Liu QLIST_INIT(&s->active_list); 40380d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4039583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4040583f21f8SStefano Stabellini s->pdus[i].s = s; 4041583f21f8SStefano Stabellini s->pdus[i].idx = i; 40422a0c56aaSWei Liu } 40432a0c56aaSWei Liu 40442a0c56aaSWei Liu v9fs_path_init(&path); 40452a0c56aaSWei Liu 40462a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 40472a0c56aaSWei Liu 40482a0c56aaSWei Liu if (!fse) { 40492a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 40502a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 40512a0c56aaSWei Liu "id = %s", 40522a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 40532a0c56aaSWei Liu goto out; 40542a0c56aaSWei Liu } 40552a0c56aaSWei Liu 40562a0c56aaSWei Liu if (!s->fsconf.tag) { 40572a0c56aaSWei Liu /* we haven't specified a mount_tag */ 40582a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 40592a0c56aaSWei Liu s->fsconf.fsdev_id); 40602a0c56aaSWei Liu goto out; 40612a0c56aaSWei Liu } 40622a0c56aaSWei Liu 40632a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 40642a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 40652a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 40662a0c56aaSWei Liu len = strlen(s->fsconf.tag); 40672a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 40682a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 40692a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 40702a0c56aaSWei Liu goto out; 40712a0c56aaSWei Liu } 40722a0c56aaSWei Liu 40732a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 40742a0c56aaSWei Liu s->ctx.uid = -1; 40752a0c56aaSWei Liu 40762a0c56aaSWei Liu s->ops = fse->ops; 40772a0c56aaSWei Liu 4078b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4079b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4080b96feb2cSTobias Schramm 40812a0c56aaSWei Liu s->fid_list = NULL; 40822a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 40832a0c56aaSWei Liu 408465603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 408565603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 408665603a80SGreg Kurz s->fsconf.fsdev_id); 40872a0c56aaSWei Liu goto out; 40882a0c56aaSWei Liu } 40892a0c56aaSWei Liu 40902a0c56aaSWei Liu /* 40912a0c56aaSWei Liu * Check details of export path, We need to use fs driver 40922a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 40932a0c56aaSWei Liu * use co-routines here. 40942a0c56aaSWei Liu */ 40952a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 40962a0c56aaSWei Liu error_setg(errp, 40972a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 40982a0c56aaSWei Liu goto out; 40992a0c56aaSWei Liu } 41002a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41012a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41022a0c56aaSWei Liu goto out; 41032a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41042a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41052a0c56aaSWei Liu goto out; 41062a0c56aaSWei Liu } 4107b8bbdb88SPradeep Jagadeesh 41083b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41093b5ee9e8SAntonios Motakis 41106b6aa828SChristian Schoenebeck /* init inode remapping : */ 41116b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 41126b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 41136b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 41146b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 41156b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 41161a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 41176b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 41186b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4119f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 41201a6ed33cSAntonios Motakis 4121b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4122b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4123b8bbdb88SPradeep Jagadeesh 41242a0c56aaSWei Liu rc = 0; 41252a0c56aaSWei Liu out: 41262a0c56aaSWei Liu if (rc) { 4127*b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4128702dbcc2SLi Qiang } 41292a0c56aaSWei Liu v9fs_path_free(&path); 41302a0c56aaSWei Liu return rc; 41312a0c56aaSWei Liu } 41322a0c56aaSWei Liu 4133*b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 41342a0c56aaSWei Liu { 4135c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4136702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4137702dbcc2SLi Qiang } 4138c0da0cb7SGreg Kurz if (s->ctx.fst) { 4139b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4140c0da0cb7SGreg Kurz } 41412a0c56aaSWei Liu g_free(s->tag); 41426b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4143f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4144f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 41454774718eSLi Qiang g_free(s->ctx.fs_root); 41462a0c56aaSWei Liu } 41472a0c56aaSWei Liu 41480e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 41490e44a0fdSGreg Kurz V9fsPDU pdu; 41500e44a0fdSGreg Kurz bool done; 41510e44a0fdSGreg Kurz } VirtfsCoResetData; 41520e44a0fdSGreg Kurz 41530e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 41540e44a0fdSGreg Kurz { 41550e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 41560e44a0fdSGreg Kurz 41570e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 41580e44a0fdSGreg Kurz data->done = true; 41590e44a0fdSGreg Kurz } 41600e44a0fdSGreg Kurz 41610e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 41620e44a0fdSGreg Kurz { 41630e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 41640e44a0fdSGreg Kurz Coroutine *co; 41650e44a0fdSGreg Kurz 41660e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 41670e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41680e44a0fdSGreg Kurz } 41690e44a0fdSGreg Kurz 41700e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 41710e44a0fdSGreg Kurz qemu_coroutine_enter(co); 41720e44a0fdSGreg Kurz 41730e44a0fdSGreg Kurz while (!data.done) { 41740e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 41750e44a0fdSGreg Kurz } 41760e44a0fdSGreg Kurz } 41770e44a0fdSGreg Kurz 417860ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 417960ce86c7SWei Liu { 418060ce86c7SWei Liu struct rlimit rlim; 418160ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 418263325b18SGreg Kurz error_report("Failed to get the resource limit"); 418360ce86c7SWei Liu exit(1); 418460ce86c7SWei Liu } 418560ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3); 418660ce86c7SWei Liu open_fd_rc = rlim.rlim_cur/2; 418760ce86c7SWei Liu } 4188