160ce86c7SWei Liu /* 260ce86c7SWei Liu * Virtio 9p backend 360ce86c7SWei Liu * 460ce86c7SWei Liu * Copyright IBM, Corp. 2010 560ce86c7SWei Liu * 660ce86c7SWei Liu * Authors: 760ce86c7SWei Liu * Anthony Liguori <aliguori@us.ibm.com> 860ce86c7SWei Liu * 960ce86c7SWei Liu * This work is licensed under the terms of the GNU GPL, version 2. See 1060ce86c7SWei Liu * the COPYING file in the top-level directory. 1160ce86c7SWei Liu * 1260ce86c7SWei Liu */ 1360ce86c7SWei Liu 146f569084SChristian Schoenebeck /* 156f569084SChristian Schoenebeck * Not so fast! You might want to read the 9p developer docs first: 166f569084SChristian Schoenebeck * https://wiki.qemu.org/Documentation/9p 176f569084SChristian Schoenebeck */ 186f569084SChristian Schoenebeck 19fbc04127SPeter Maydell #include "qemu/osdep.h" 20e3e83f2eSGreg Kurz #include <glib/gprintf.h> 2160ce86c7SWei Liu #include "hw/virtio/virtio.h" 22da34e65cSMarkus Armbruster #include "qapi/error.h" 2360ce86c7SWei Liu #include "qemu/error-report.h" 2460ce86c7SWei Liu #include "qemu/iov.h" 25db725815SMarkus Armbruster #include "qemu/main-loop.h" 2660ce86c7SWei Liu #include "qemu/sockets.h" 2760ce86c7SWei Liu #include "virtio-9p.h" 2860ce86c7SWei Liu #include "fsdev/qemu-fsdev.h" 2960ce86c7SWei Liu #include "9p-xattr.h" 30*6b3b279bSKeno Fischer #include "9p-util.h" 3160ce86c7SWei Liu #include "coth.h" 3260ce86c7SWei Liu #include "trace.h" 33795c40b8SJuan Quintela #include "migration/blocker.h" 341a6ed33cSAntonios Motakis #include "qemu/xxhash.h" 356b6aa828SChristian Schoenebeck #include <math.h> 36e0bd743bSKeno Fischer #ifdef CONFIG_LINUX 3703556ea9SDan Robertson #include <linux/limits.h> 38e0bd743bSKeno Fischer #else 39e0bd743bSKeno Fischer #include <limits.h> 40e0bd743bSKeno Fischer #endif 4160ce86c7SWei Liu 4260ce86c7SWei Liu int open_fd_hw; 4360ce86c7SWei Liu int total_open_fd; 4460ce86c7SWei Liu static int open_fd_rc; 4560ce86c7SWei Liu 4660ce86c7SWei Liu enum { 4760ce86c7SWei Liu Oread = 0x00, 4860ce86c7SWei Liu Owrite = 0x01, 4960ce86c7SWei Liu Ordwr = 0x02, 5060ce86c7SWei Liu Oexec = 0x03, 5160ce86c7SWei Liu Oexcl = 0x04, 5260ce86c7SWei Liu Otrunc = 0x10, 5360ce86c7SWei Liu Orexec = 0x20, 5460ce86c7SWei Liu Orclose = 0x40, 5560ce86c7SWei Liu Oappend = 0x80, 5660ce86c7SWei Liu }; 5760ce86c7SWei Liu 58cc82fde9SChristian Schoenebeck P9ARRAY_DEFINE_TYPE(V9fsPath, v9fs_path_free); 59cc82fde9SChristian Schoenebeck 6075673590SGreg Kurz static ssize_t pdu_marshal(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_vmarshal(pdu, offset, fmt, ap); 6760ce86c7SWei Liu va_end(ap); 6860ce86c7SWei Liu 6960ce86c7SWei Liu return ret; 7060ce86c7SWei Liu } 7160ce86c7SWei Liu 7275673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 7360ce86c7SWei Liu { 7460ce86c7SWei Liu ssize_t ret; 7560ce86c7SWei Liu va_list ap; 7660ce86c7SWei Liu 7760ce86c7SWei Liu va_start(ap, fmt); 78ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 7960ce86c7SWei Liu va_end(ap); 8060ce86c7SWei Liu 8160ce86c7SWei Liu return ret; 8260ce86c7SWei Liu } 8360ce86c7SWei Liu 8460ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 8560ce86c7SWei Liu { 8660ce86c7SWei Liu int ret = 0; 8760ce86c7SWei Liu 8860ce86c7SWei Liu switch (mode & 3) { 8960ce86c7SWei Liu case Oread: 9060ce86c7SWei Liu ret = O_RDONLY; 9160ce86c7SWei Liu break; 9260ce86c7SWei Liu case Ordwr: 9360ce86c7SWei Liu ret = O_RDWR; 9460ce86c7SWei Liu break; 9560ce86c7SWei Liu case Owrite: 9660ce86c7SWei Liu ret = O_WRONLY; 9760ce86c7SWei Liu break; 9860ce86c7SWei Liu case Oexec: 9960ce86c7SWei Liu ret = O_RDONLY; 10060ce86c7SWei Liu break; 10160ce86c7SWei Liu } 10260ce86c7SWei Liu 10360ce86c7SWei Liu if (mode & Otrunc) { 10460ce86c7SWei Liu ret |= O_TRUNC; 10560ce86c7SWei Liu } 10660ce86c7SWei Liu 10760ce86c7SWei Liu if (mode & Oappend) { 10860ce86c7SWei Liu ret |= O_APPEND; 10960ce86c7SWei Liu } 11060ce86c7SWei Liu 11160ce86c7SWei Liu if (mode & Oexcl) { 11260ce86c7SWei Liu ret |= O_EXCL; 11360ce86c7SWei Liu } 11460ce86c7SWei Liu 11560ce86c7SWei Liu return ret; 11660ce86c7SWei Liu } 11760ce86c7SWei Liu 1188e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 11960ce86c7SWei Liu int dotl_flag; 12060ce86c7SWei Liu int open_flag; 1218e71b96cSGreg Kurz } DotlOpenflagMap; 12260ce86c7SWei Liu 12360ce86c7SWei Liu static int dotl_to_open_flags(int flags) 12460ce86c7SWei Liu { 12560ce86c7SWei Liu int i; 12660ce86c7SWei Liu /* 12760ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 12860ce86c7SWei Liu * and P9_DOTL_NOACCESS 12960ce86c7SWei Liu */ 13060ce86c7SWei Liu int oflags = flags & O_ACCMODE; 13160ce86c7SWei Liu 1328e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 13360ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 13460ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 13560ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 13660ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 13760ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 13860ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 13960ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 14060ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 14160ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 14260ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 14360ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 14460ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 14560ce86c7SWei Liu { P9_DOTL_NOATIME, O_NOATIME }, 14660ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 14760ce86c7SWei Liu }; 14860ce86c7SWei Liu 14960ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 15060ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 15160ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 15260ce86c7SWei Liu } 15360ce86c7SWei Liu } 15460ce86c7SWei Liu 15560ce86c7SWei Liu return oflags; 15660ce86c7SWei Liu } 15760ce86c7SWei Liu 15860ce86c7SWei Liu void cred_init(FsCred *credp) 15960ce86c7SWei Liu { 16060ce86c7SWei Liu credp->fc_uid = -1; 16160ce86c7SWei Liu credp->fc_gid = -1; 16260ce86c7SWei Liu credp->fc_mode = -1; 16360ce86c7SWei Liu credp->fc_rdev = -1; 16460ce86c7SWei Liu } 16560ce86c7SWei Liu 16660ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 16760ce86c7SWei Liu { 16860ce86c7SWei Liu int flags; 16960ce86c7SWei Liu /* 17060ce86c7SWei Liu * Filter the client open flags 17160ce86c7SWei Liu */ 17260ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 17360ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 17460ce86c7SWei Liu /* 17560ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 17660ce86c7SWei Liu */ 17760ce86c7SWei Liu flags &= ~O_DIRECT; 17860ce86c7SWei Liu return flags; 17960ce86c7SWei Liu } 18060ce86c7SWei Liu 18160ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 18260ce86c7SWei Liu { 18360ce86c7SWei Liu path->data = NULL; 18460ce86c7SWei Liu path->size = 0; 18560ce86c7SWei Liu } 18660ce86c7SWei Liu 18760ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 18860ce86c7SWei Liu { 18960ce86c7SWei Liu g_free(path->data); 19060ce86c7SWei Liu path->data = NULL; 19160ce86c7SWei Liu path->size = 0; 19260ce86c7SWei Liu } 19360ce86c7SWei Liu 194e3e83f2eSGreg Kurz 195e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 196e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 197e3e83f2eSGreg Kurz { 198e3e83f2eSGreg Kurz va_list ap; 199e3e83f2eSGreg Kurz 200e3e83f2eSGreg Kurz v9fs_path_free(path); 201e3e83f2eSGreg Kurz 202e3e83f2eSGreg Kurz va_start(ap, fmt); 203e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 204e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 205e3e83f2eSGreg Kurz va_end(ap); 206e3e83f2eSGreg Kurz } 207e3e83f2eSGreg Kurz 208e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 20960ce86c7SWei Liu { 210e446a1ebSMarc-André Lureau v9fs_path_free(dst); 211e446a1ebSMarc-André Lureau dst->size = src->size; 212e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 21360ce86c7SWei Liu } 21460ce86c7SWei Liu 21560ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 21660ce86c7SWei Liu const char *name, V9fsPath *path) 21760ce86c7SWei Liu { 21860ce86c7SWei Liu int err; 21960ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 22060ce86c7SWei Liu if (err < 0) { 22160ce86c7SWei Liu err = -errno; 22260ce86c7SWei Liu } 22360ce86c7SWei Liu return err; 22460ce86c7SWei Liu } 22560ce86c7SWei Liu 22660ce86c7SWei Liu /* 22760ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 22860ce86c7SWei Liu * 22960ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 23060ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 23160ce86c7SWei Liu */ 23260ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 23360ce86c7SWei Liu { 23460ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 23560ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 23660ce86c7SWei Liu return 1; 23760ce86c7SWei Liu } 23860ce86c7SWei Liu } 23960ce86c7SWei Liu return 0; 24060ce86c7SWei Liu } 24160ce86c7SWei Liu 24260ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 24360ce86c7SWei Liu { 24460ce86c7SWei Liu return str->size; 24560ce86c7SWei Liu } 24660ce86c7SWei Liu 24760ce86c7SWei Liu /* 24860ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2498440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 25060ce86c7SWei Liu { 25160ce86c7SWei Liu int err = 1; 25260ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 25360ce86c7SWei Liu if (f->fs.fd == -1) { 25460ce86c7SWei Liu do { 25560ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 25660ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25760ce86c7SWei Liu } 25860ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 259f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 26060ce86c7SWei Liu do { 26160ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 26260ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 26360ce86c7SWei Liu } 26460ce86c7SWei Liu } 26560ce86c7SWei Liu return err; 26660ce86c7SWei Liu } 26760ce86c7SWei Liu 2688440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 26960ce86c7SWei Liu { 27060ce86c7SWei Liu int err; 27160ce86c7SWei Liu V9fsFidState *f; 27260ce86c7SWei Liu V9fsState *s = pdu->s; 27360ce86c7SWei Liu 274feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 27560ce86c7SWei Liu BUG_ON(f->clunked); 27660ce86c7SWei Liu if (f->fid == fid) { 27760ce86c7SWei Liu /* 27860ce86c7SWei Liu * Update the fid ref upfront so that 27960ce86c7SWei Liu * we don't get reclaimed when we yield 28060ce86c7SWei Liu * in open later. 28160ce86c7SWei Liu */ 28260ce86c7SWei Liu f->ref++; 28360ce86c7SWei Liu /* 28460ce86c7SWei Liu * check whether we need to reopen the 28560ce86c7SWei Liu * file. We might have closed the fd 28660ce86c7SWei Liu * while trying to free up some file 28760ce86c7SWei Liu * descriptors. 28860ce86c7SWei Liu */ 28960ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 29060ce86c7SWei Liu if (err < 0) { 29160ce86c7SWei Liu f->ref--; 29260ce86c7SWei Liu return NULL; 29360ce86c7SWei Liu } 29460ce86c7SWei Liu /* 29560ce86c7SWei Liu * Mark the fid as referenced so that the LRU 29660ce86c7SWei Liu * reclaim won't close the file descriptor 29760ce86c7SWei Liu */ 29860ce86c7SWei Liu f->flags |= FID_REFERENCED; 29960ce86c7SWei Liu return f; 30060ce86c7SWei Liu } 30160ce86c7SWei Liu } 30260ce86c7SWei Liu return NULL; 30360ce86c7SWei Liu } 30460ce86c7SWei Liu 30560ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 30660ce86c7SWei Liu { 30760ce86c7SWei Liu V9fsFidState *f; 30860ce86c7SWei Liu 309feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 31060ce86c7SWei Liu /* If fid is already there return NULL */ 31160ce86c7SWei Liu BUG_ON(f->clunked); 31260ce86c7SWei Liu if (f->fid == fid) { 31360ce86c7SWei Liu return NULL; 31460ce86c7SWei Liu } 31560ce86c7SWei Liu } 31660ce86c7SWei Liu f = g_malloc0(sizeof(V9fsFidState)); 31760ce86c7SWei Liu f->fid = fid; 31860ce86c7SWei Liu f->fid_type = P9_FID_NONE; 31960ce86c7SWei Liu f->ref = 1; 32060ce86c7SWei Liu /* 32160ce86c7SWei Liu * Mark the fid as referenced so that the LRU 32260ce86c7SWei Liu * reclaim won't close the file descriptor 32360ce86c7SWei Liu */ 32460ce86c7SWei Liu f->flags |= FID_REFERENCED; 32520b7f45bSGreg Kurz QSIMPLEQ_INSERT_TAIL(&s->fid_list, f, next); 32660ce86c7SWei Liu 327d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 328d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3297cde47d4SGreg Kurz 33060ce86c7SWei Liu return f; 33160ce86c7SWei Liu } 33260ce86c7SWei Liu 3338440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 33460ce86c7SWei Liu { 33560ce86c7SWei Liu int retval = 0; 33660ce86c7SWei Liu 337dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 33860ce86c7SWei Liu /* getxattr/listxattr fid */ 33960ce86c7SWei Liu goto free_value; 34060ce86c7SWei Liu } 34160ce86c7SWei Liu /* 34260ce86c7SWei Liu * if this is fid for setxattr. clunk should 34360ce86c7SWei Liu * result in setxattr localcall 34460ce86c7SWei Liu */ 34560ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 34660ce86c7SWei Liu /* clunk after partial write */ 34760ce86c7SWei Liu retval = -EINVAL; 34860ce86c7SWei Liu goto free_out; 34960ce86c7SWei Liu } 35060ce86c7SWei Liu if (fidp->fs.xattr.len) { 35160ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 35260ce86c7SWei Liu fidp->fs.xattr.value, 35360ce86c7SWei Liu fidp->fs.xattr.len, 35460ce86c7SWei Liu fidp->fs.xattr.flags); 35560ce86c7SWei Liu } else { 35660ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 35760ce86c7SWei Liu } 35860ce86c7SWei Liu free_out: 35960ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 36060ce86c7SWei Liu free_value: 36160ce86c7SWei Liu g_free(fidp->fs.xattr.value); 36260ce86c7SWei Liu return retval; 36360ce86c7SWei Liu } 36460ce86c7SWei Liu 3658440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 36660ce86c7SWei Liu { 36760ce86c7SWei Liu int retval = 0; 36860ce86c7SWei Liu 36960ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 37060ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 37160ce86c7SWei Liu if (fidp->fs.fd != -1) { 37260ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 37360ce86c7SWei Liu } 37460ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 375f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 37660ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 37760ce86c7SWei Liu } 37860ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 37960ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 38060ce86c7SWei Liu } 38160ce86c7SWei Liu v9fs_path_free(&fidp->path); 38260ce86c7SWei Liu g_free(fidp); 38360ce86c7SWei Liu return retval; 38460ce86c7SWei Liu } 38560ce86c7SWei Liu 3868440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 38760ce86c7SWei Liu { 38860ce86c7SWei Liu BUG_ON(!fidp->ref); 38960ce86c7SWei Liu fidp->ref--; 39060ce86c7SWei Liu /* 39160ce86c7SWei Liu * Don't free the fid if it is in reclaim list 39260ce86c7SWei Liu */ 39360ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 39460ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 39560ce86c7SWei Liu /* 39660ce86c7SWei Liu * if the clunked fid is root fid then we 39760ce86c7SWei Liu * have unmounted the fs on the client side. 39860ce86c7SWei Liu * delete the migration blocker. Ideally, this 39960ce86c7SWei Liu * should be hooked to transport close notification 40060ce86c7SWei Liu */ 40160ce86c7SWei Liu if (pdu->s->migration_blocker) { 40260ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 40360ce86c7SWei Liu error_free(pdu->s->migration_blocker); 40460ce86c7SWei Liu pdu->s->migration_blocker = NULL; 40560ce86c7SWei Liu } 40660ce86c7SWei Liu } 40760ce86c7SWei Liu return free_fid(pdu, fidp); 40860ce86c7SWei Liu } 40960ce86c7SWei Liu return 0; 41060ce86c7SWei Liu } 41160ce86c7SWei Liu 41260ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 41360ce86c7SWei Liu { 414feabd6cfSGreg Kurz V9fsFidState *fidp; 41560ce86c7SWei Liu 416feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 417feabd6cfSGreg Kurz if (fidp->fid == fid) { 418feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 4192e53160fSGreg Kurz fidp->clunked = true; 42060ce86c7SWei Liu return fidp; 42160ce86c7SWei Liu } 422feabd6cfSGreg Kurz } 423feabd6cfSGreg Kurz return NULL; 424feabd6cfSGreg Kurz } 42560ce86c7SWei Liu 4268440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 42760ce86c7SWei Liu { 42860ce86c7SWei Liu int reclaim_count = 0; 42960ce86c7SWei Liu V9fsState *s = pdu->s; 43081f9766bSGreg Kurz V9fsFidState *f; 43181f9766bSGreg Kurz QSLIST_HEAD(, V9fsFidState) reclaim_list = 43281f9766bSGreg Kurz QSLIST_HEAD_INITIALIZER(reclaim_list); 43360ce86c7SWei Liu 434feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 43560ce86c7SWei Liu /* 43660ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 43760ce86c7SWei Liu * for them and skip them. Also skip fids 43860ce86c7SWei Liu * currently being operated on. 43960ce86c7SWei Liu */ 44060ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 44160ce86c7SWei Liu continue; 44260ce86c7SWei Liu } 44360ce86c7SWei Liu /* 44460ce86c7SWei Liu * if it is a recently referenced fid 44560ce86c7SWei Liu * we leave the fid untouched and clear the 44660ce86c7SWei Liu * reference bit. We come back to it later 44760ce86c7SWei Liu * in the next iteration. (a simple LRU without 44860ce86c7SWei Liu * moving list elements around) 44960ce86c7SWei Liu */ 45060ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 45160ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 45260ce86c7SWei Liu continue; 45360ce86c7SWei Liu } 45460ce86c7SWei Liu /* 45560ce86c7SWei Liu * Add fids to reclaim list. 45660ce86c7SWei Liu */ 45760ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 45860ce86c7SWei Liu if (f->fs.fd != -1) { 45960ce86c7SWei Liu /* 46060ce86c7SWei Liu * Up the reference count so that 46160ce86c7SWei Liu * a clunk request won't free this fid 46260ce86c7SWei Liu */ 46360ce86c7SWei Liu f->ref++; 46481f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 46560ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 46660ce86c7SWei Liu f->fs.fd = -1; 46760ce86c7SWei Liu reclaim_count++; 46860ce86c7SWei Liu } 46960ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 470f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 47160ce86c7SWei Liu /* 47260ce86c7SWei Liu * Up the reference count so that 47360ce86c7SWei Liu * a clunk request won't free this fid 47460ce86c7SWei Liu */ 47560ce86c7SWei Liu f->ref++; 47681f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 477f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 478f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 47960ce86c7SWei Liu reclaim_count++; 48060ce86c7SWei Liu } 48160ce86c7SWei Liu } 48260ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 48360ce86c7SWei Liu break; 48460ce86c7SWei Liu } 48560ce86c7SWei Liu } 48660ce86c7SWei Liu /* 48760ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 48860ce86c7SWei Liu * are already clunked. 48960ce86c7SWei Liu */ 49081f9766bSGreg Kurz while (!QSLIST_EMPTY(&reclaim_list)) { 49181f9766bSGreg Kurz f = QSLIST_FIRST(&reclaim_list); 49281f9766bSGreg Kurz QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); 49360ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 49460ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 49560ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 49660ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 49760ce86c7SWei Liu } 49860ce86c7SWei Liu /* 49960ce86c7SWei Liu * Now drop the fid reference, free it 50060ce86c7SWei Liu * if clunked. 50160ce86c7SWei Liu */ 50260ce86c7SWei Liu put_fid(pdu, f); 50360ce86c7SWei Liu } 50460ce86c7SWei Liu } 50560ce86c7SWei Liu 5068440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 50760ce86c7SWei Liu { 50860ce86c7SWei Liu int err; 50960ce86c7SWei Liu V9fsState *s = pdu->s; 51020b7f45bSGreg Kurz V9fsFidState *fidp, *fidp_next; 51160ce86c7SWei Liu 51220b7f45bSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 51320b7f45bSGreg Kurz if (!fidp) { 51420b7f45bSGreg Kurz return 0; 51560ce86c7SWei Liu } 51620b7f45bSGreg Kurz 51720b7f45bSGreg Kurz /* 51820b7f45bSGreg Kurz * v9fs_reopen_fid() can yield : a reference on the fid must be held 51920b7f45bSGreg Kurz * to ensure its pointer remains valid and we can safely pass it to 52020b7f45bSGreg Kurz * QSIMPLEQ_NEXT(). The corresponding put_fid() can also yield so 52120b7f45bSGreg Kurz * we must keep a reference on the next fid as well. So the logic here 52220b7f45bSGreg Kurz * is to get a reference on a fid and only put it back during the next 52320b7f45bSGreg Kurz * iteration after we could get a reference on the next fid. Start with 52420b7f45bSGreg Kurz * the first one. 52520b7f45bSGreg Kurz */ 52620b7f45bSGreg Kurz for (fidp->ref++; fidp; fidp = fidp_next) { 52720b7f45bSGreg Kurz if (fidp->path.size == path->size && 52820b7f45bSGreg Kurz !memcmp(fidp->path.data, path->data, path->size)) { 52960ce86c7SWei Liu /* Mark the fid non reclaimable. */ 53060ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 53160ce86c7SWei Liu 53260ce86c7SWei Liu /* reopen the file/dir if already closed */ 53360ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 53460ce86c7SWei Liu if (err < 0) { 53520b7f45bSGreg Kurz put_fid(pdu, fidp); 536267fcadfSGreg Kurz return err; 53760ce86c7SWei Liu } 53820b7f45bSGreg Kurz } 53920b7f45bSGreg Kurz 54020b7f45bSGreg Kurz fidp_next = QSIMPLEQ_NEXT(fidp, next); 54120b7f45bSGreg Kurz 54220b7f45bSGreg Kurz if (fidp_next) { 54360ce86c7SWei Liu /* 54420b7f45bSGreg Kurz * Ensure the next fid survives a potential clunk request during 54520b7f45bSGreg Kurz * put_fid() below and v9fs_reopen_fid() in the next iteration. 54660ce86c7SWei Liu */ 54720b7f45bSGreg Kurz fidp_next->ref++; 54860ce86c7SWei Liu } 54920b7f45bSGreg Kurz 55020b7f45bSGreg Kurz /* We're done with this fid */ 55120b7f45bSGreg Kurz put_fid(pdu, fidp); 55260ce86c7SWei Liu } 55320b7f45bSGreg Kurz 55460ce86c7SWei Liu return 0; 55560ce86c7SWei Liu } 55660ce86c7SWei Liu 5578440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 55860ce86c7SWei Liu { 55960ce86c7SWei Liu V9fsState *s = pdu->s; 56079decce3SGreg Kurz V9fsFidState *fidp; 56160ce86c7SWei Liu 56260ce86c7SWei Liu /* Free all fids */ 563feabd6cfSGreg Kurz while (!QSIMPLEQ_EMPTY(&s->fid_list)) { 5646d54af0eSGreg Kurz /* Get fid */ 565feabd6cfSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 5666d54af0eSGreg Kurz fidp->ref++; 56760ce86c7SWei Liu 5686d54af0eSGreg Kurz /* Clunk fid */ 569feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 5702e53160fSGreg Kurz fidp->clunked = true; 5716d54af0eSGreg Kurz 5726d54af0eSGreg Kurz put_fid(pdu, fidp); 57360ce86c7SWei Liu } 57460ce86c7SWei Liu } 57560ce86c7SWei Liu 57660ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 57760ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 57860ce86c7SWei Liu 57960ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 58060ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 58160ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 58260ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 58360ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 58460ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 58560ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 58660ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 58760ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 58860ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 58960ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 59060ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 59160ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 59260ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 59360ce86c7SWei Liu 59460ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 59560ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 59660ce86c7SWei Liu P9_STAT_MODE_LINK | \ 59760ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 59860ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 59960ce86c7SWei Liu P9_STAT_MODE_SOCKET) 60060ce86c7SWei Liu 6016b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 6026b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 6036b6aa828SChristian Schoenebeck { 6046b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 6056b6aa828SChristian Schoenebeck } 6066b6aa828SChristian Schoenebeck 6076b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 6086b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 6096b6aa828SChristian Schoenebeck { 6106b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 6116b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 6126b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 6136b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 6146b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 6156b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 6166b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 6176b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 6186b6aa828SChristian Schoenebeck } 6196b6aa828SChristian Schoenebeck 6206b6aa828SChristian Schoenebeck /** 6216b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 6226b6aa828SChristian Schoenebeck * 6236b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6246b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6256b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6266b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6276b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6286b6aa828SChristian Schoenebeck * 6296b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6306b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6316b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6326b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6336b6aa828SChristian Schoenebeck * 6346b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6356b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6366b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6376b6aa828SChristian Schoenebeck */ 6386b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6396b6aa828SChristian Schoenebeck 6406b6aa828SChristian Schoenebeck /** 6416b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6426b6aa828SChristian Schoenebeck * 6436b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6446b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6456b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6466b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6476b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6486b6aa828SChristian Schoenebeck * 6496b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6506b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6516b6aa828SChristian Schoenebeck * 6526b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6536b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6546b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6556b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6566b6aa828SChristian Schoenebeck */ 6576b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6586b6aa828SChristian Schoenebeck { 6596b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6606b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6616b6aa828SChristian Schoenebeck return (VariLenAffix) { 6626b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6636b6aa828SChristian Schoenebeck .value = value, 6646b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6656b6aa828SChristian Schoenebeck }; 6666b6aa828SChristian Schoenebeck } 6676b6aa828SChristian Schoenebeck 6686b6aa828SChristian Schoenebeck /** 6696b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6706b6aa828SChristian Schoenebeck * 6716b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6726b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6736b6aa828SChristian Schoenebeck * after the conversion. 6746b6aa828SChristian Schoenebeck * 6756b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6766b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6776b6aa828SChristian Schoenebeck * versa). 6786b6aa828SChristian Schoenebeck */ 6796b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6806b6aa828SChristian Schoenebeck { 6816b6aa828SChristian Schoenebeck return (VariLenAffix) { 6826b6aa828SChristian Schoenebeck .type = 6836b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6846b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6856b6aa828SChristian Schoenebeck .value = 6866b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6876b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6886b6aa828SChristian Schoenebeck .bits = affix->bits 6896b6aa828SChristian Schoenebeck }; 6906b6aa828SChristian Schoenebeck } 6916b6aa828SChristian Schoenebeck 6926b6aa828SChristian Schoenebeck /** 6936b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6946b6aa828SChristian Schoenebeck * 6956b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6966b6aa828SChristian Schoenebeck * 6976b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6986b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6996b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 7006b6aa828SChristian Schoenebeck * 7016b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 7026b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 7036b6aa828SChristian Schoenebeck */ 7046b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 7056b6aa828SChristian Schoenebeck { 7066b6aa828SChristian Schoenebeck VariLenAffix prefix; 7076b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 7086b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 7096b6aa828SChristian Schoenebeck } 7106b6aa828SChristian Schoenebeck 7111a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 7121a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 7131a6ed33cSAntonios Motakis { 7141a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 7151a6ed33cSAntonios Motakis } 7161a6ed33cSAntonios Motakis 717f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 718f3fe4a2dSAntonios Motakis { 719f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 720f3fe4a2dSAntonios Motakis } 721f3fe4a2dSAntonios Motakis 7226b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7236b6aa828SChristian Schoenebeck { 7246b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7256b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7266b6aa828SChristian Schoenebeck } 7276b6aa828SChristian Schoenebeck 7286b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7291a6ed33cSAntonios Motakis { 7301a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7311a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7321a6ed33cSAntonios Motakis } 7331a6ed33cSAntonios Motakis 7346b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 735f3fe4a2dSAntonios Motakis { 736f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 737f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 738f3fe4a2dSAntonios Motakis } 739f3fe4a2dSAntonios Motakis 740f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7411a6ed33cSAntonios Motakis { 7421a6ed33cSAntonios Motakis g_free(p); 7431a6ed33cSAntonios Motakis } 7441a6ed33cSAntonios Motakis 745f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7461a6ed33cSAntonios Motakis { 7471a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7481a6ed33cSAntonios Motakis return; 7491a6ed33cSAntonios Motakis } 750f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7511a6ed33cSAntonios Motakis qht_destroy(ht); 7521a6ed33cSAntonios Motakis } 7531a6ed33cSAntonios Motakis 7546b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7556b6aa828SChristian Schoenebeck { 7566b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7576b6aa828SChristian Schoenebeck } 7586b6aa828SChristian Schoenebeck 7591a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7601a6ed33cSAntonios Motakis { 7616b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7621a6ed33cSAntonios Motakis } 7631a6ed33cSAntonios Motakis 764f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 765f3fe4a2dSAntonios Motakis { 7666b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 767f3fe4a2dSAntonios Motakis } 768f3fe4a2dSAntonios Motakis 7696b6aa828SChristian Schoenebeck /* 7706b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7716b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7726b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7736b6aa828SChristian Schoenebeck * 7746b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7756b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7766b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7776b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7786b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7796b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7806b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7816b6aa828SChristian Schoenebeck */ 7826b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7836b6aa828SChristian Schoenebeck { 7846b6aa828SChristian Schoenebeck QpdEntry lookup = { 7856b6aa828SChristian Schoenebeck .dev = dev 7866b6aa828SChristian Schoenebeck }, *val; 7876b6aa828SChristian Schoenebeck uint32_t hash = dev; 7886b6aa828SChristian Schoenebeck VariLenAffix affix; 7896b6aa828SChristian Schoenebeck 7906b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7916b6aa828SChristian Schoenebeck if (!val) { 7926b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7936b6aa828SChristian Schoenebeck *val = lookup; 7946b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7956b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7966b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7976b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7986b6aa828SChristian Schoenebeck } 7996b6aa828SChristian Schoenebeck return val->prefix_bits; 8006b6aa828SChristian Schoenebeck } 8016b6aa828SChristian Schoenebeck 8026b6aa828SChristian Schoenebeck /** 8036b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 8046b6aa828SChristian Schoenebeck * 8056b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 8066b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 8076b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 8086b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 8096b6aa828SChristian Schoenebeck * guest. 8106b6aa828SChristian Schoenebeck * 8116b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 8126b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 8136b6aa828SChristian Schoenebeck * expected ever to be used at all though. 8146b6aa828SChristian Schoenebeck * 8156b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 8166b6aa828SChristian Schoenebeck * 8176b6aa828SChristian Schoenebeck */ 818f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 819f3fe4a2dSAntonios Motakis uint64_t *path) 820f3fe4a2dSAntonios Motakis { 821f3fe4a2dSAntonios Motakis QpfEntry lookup = { 822f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 823f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 824f3fe4a2dSAntonios Motakis }, *val; 825f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8266b6aa828SChristian Schoenebeck VariLenAffix affix; 827f3fe4a2dSAntonios Motakis 828f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 829f3fe4a2dSAntonios Motakis 830f3fe4a2dSAntonios Motakis if (!val) { 831f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 832f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 833f3fe4a2dSAntonios Motakis error_report_once( 834f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 835f3fe4a2dSAntonios Motakis "host to guest." 836f3fe4a2dSAntonios Motakis ); 837f3fe4a2dSAntonios Motakis return -ENFILE; 838f3fe4a2dSAntonios Motakis } 839f3fe4a2dSAntonios Motakis 840f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 841f3fe4a2dSAntonios Motakis *val = lookup; 842f3fe4a2dSAntonios Motakis 843f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8446b6aa828SChristian Schoenebeck affix = affixForIndex( 8456b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8466b6aa828SChristian Schoenebeck ); 8476b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8486b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 849f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 850f3fe4a2dSAntonios Motakis } 851f3fe4a2dSAntonios Motakis 852f3fe4a2dSAntonios Motakis *path = val->path; 853f3fe4a2dSAntonios Motakis return 0; 854f3fe4a2dSAntonios Motakis } 855f3fe4a2dSAntonios Motakis 8566b6aa828SChristian Schoenebeck /** 8576b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8581a6ed33cSAntonios Motakis * 8596b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8606b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8616b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8626b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8636b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8646b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8656b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8666b6aa828SChristian Schoenebeck * that is). 8676b6aa828SChristian Schoenebeck * 8686b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8696b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8706b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8716b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8726b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8736b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8746b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8756b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8766b6aa828SChristian Schoenebeck * 8776b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8786b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8796b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8806b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8816b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8826b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8836b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8846b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8856b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8866b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8876b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8886b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8896b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8906b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8916b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8926b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8936b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8941a6ed33cSAntonios Motakis */ 8956b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8961a6ed33cSAntonios Motakis uint64_t *path) 8971a6ed33cSAntonios Motakis { 8986b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8991a6ed33cSAntonios Motakis QppEntry lookup = { 9001a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 9016b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 9021a6ed33cSAntonios Motakis }, *val; 9031a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 9041a6ed33cSAntonios Motakis 9051a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 9061a6ed33cSAntonios Motakis 9071a6ed33cSAntonios Motakis if (!val) { 9086b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 9096b6aa828SChristian Schoenebeck /* we ran out of affixes */ 910f3fe4a2dSAntonios Motakis warn_report_once( 911f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 9121a6ed33cSAntonios Motakis ); 9131a6ed33cSAntonios Motakis return -ENFILE; 9141a6ed33cSAntonios Motakis } 9151a6ed33cSAntonios Motakis 9161a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 9171a6ed33cSAntonios Motakis *val = lookup; 9181a6ed33cSAntonios Motakis 9196b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 9206b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 9216b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 9221a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9231a6ed33cSAntonios Motakis } 9246b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9256b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9261a6ed33cSAntonios Motakis return 0; 9271a6ed33cSAntonios Motakis } 9281a6ed33cSAntonios Motakis 9293b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 93060ce86c7SWei Liu { 9311a6ed33cSAntonios Motakis int err; 93260ce86c7SWei Liu size_t size; 93360ce86c7SWei Liu 9341a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9351a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9366b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 937f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 938f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 939f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 940f3fe4a2dSAntonios Motakis } 9411a6ed33cSAntonios Motakis if (err) { 9421a6ed33cSAntonios Motakis return err; 9431a6ed33cSAntonios Motakis } 9441a6ed33cSAntonios Motakis } else { 9453b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9461a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9471a6ed33cSAntonios Motakis error_report_once( 9481a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9491a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9501a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9511a6ed33cSAntonios Motakis "effective." 9521a6ed33cSAntonios Motakis ); 9531a6ed33cSAntonios Motakis return -ENODEV; 9541a6ed33cSAntonios Motakis } else { 9553b5ee9e8SAntonios Motakis warn_report_once( 9563b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9573b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9581a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9591a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9601a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9613b5ee9e8SAntonios Motakis ); 9623b5ee9e8SAntonios Motakis } 9631a6ed33cSAntonios Motakis } 96460ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 96560ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 96660ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9671a6ed33cSAntonios Motakis } 9681a6ed33cSAntonios Motakis 96960ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 97060ce86c7SWei Liu qidp->type = 0; 97160ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 97260ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 97360ce86c7SWei Liu } 97460ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 97560ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 97660ce86c7SWei Liu } 9773b5ee9e8SAntonios Motakis 9783b5ee9e8SAntonios Motakis return 0; 97960ce86c7SWei Liu } 98060ce86c7SWei Liu 98160ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 98260ce86c7SWei Liu { 98360ce86c7SWei Liu V9fsPDU *pdu = NULL; 98460ce86c7SWei Liu 98560ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 98660ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 98760ce86c7SWei Liu QLIST_REMOVE(pdu, next); 98860ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 98960ce86c7SWei Liu } 99060ce86c7SWei Liu return pdu; 99160ce86c7SWei Liu } 99260ce86c7SWei Liu 99360ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 99460ce86c7SWei Liu { 99560ce86c7SWei Liu V9fsState *s = pdu->s; 996f74e27bfSGreg Kurz 997f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 99860ce86c7SWei Liu QLIST_REMOVE(pdu, next); 99960ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 100060ce86c7SWei Liu } 100160ce86c7SWei Liu 10028440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 100360ce86c7SWei Liu { 100460ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 100560ce86c7SWei Liu V9fsState *s = pdu->s; 100606a37db7SGreg Kurz int ret; 100760ce86c7SWei Liu 1008fc78d5eeSKeno Fischer /* 1009fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1010fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1011fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1012fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1013fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1014fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1015fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1016fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1017fc78d5eeSKeno Fischer * transmission of the reply. 1018fc78d5eeSKeno Fischer */ 1019fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1020fc78d5eeSKeno Fischer if (discard) { 1021fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1022fc78d5eeSKeno Fischer pdu->size = 0; 1023fc78d5eeSKeno Fischer goto out_notify; 1024fc78d5eeSKeno Fischer } 1025fc78d5eeSKeno Fischer 102660ce86c7SWei Liu if (len < 0) { 102760ce86c7SWei Liu int err = -len; 102860ce86c7SWei Liu len = 7; 102960ce86c7SWei Liu 103060ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 103160ce86c7SWei Liu V9fsString str; 103260ce86c7SWei Liu 103360ce86c7SWei Liu str.data = strerror(err); 103460ce86c7SWei Liu str.size = strlen(str.data); 103560ce86c7SWei Liu 103606a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 103706a37db7SGreg Kurz if (ret < 0) { 103806a37db7SGreg Kurz goto out_notify; 103906a37db7SGreg Kurz } 104006a37db7SGreg Kurz len += ret; 104160ce86c7SWei Liu id = P9_RERROR; 104260ce86c7SWei Liu } 104360ce86c7SWei Liu 104406a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 104506a37db7SGreg Kurz if (ret < 0) { 104606a37db7SGreg Kurz goto out_notify; 104706a37db7SGreg Kurz } 104806a37db7SGreg Kurz len += ret; 104960ce86c7SWei Liu 105060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 105160ce86c7SWei Liu id = P9_RLERROR; 105260ce86c7SWei Liu } 105360ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 105460ce86c7SWei Liu } 105560ce86c7SWei Liu 105660ce86c7SWei Liu /* fill out the header */ 105706a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 105806a37db7SGreg Kurz goto out_notify; 105906a37db7SGreg Kurz } 106060ce86c7SWei Liu 106160ce86c7SWei Liu /* keep these in sync */ 106260ce86c7SWei Liu pdu->size = len; 106360ce86c7SWei Liu pdu->id = id; 106460ce86c7SWei Liu 106506a37db7SGreg Kurz out_notify: 1066a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 106760ce86c7SWei Liu 106860ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1069f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 107060ce86c7SWei Liu pdu_free(pdu); 107160ce86c7SWei Liu } 1072f74e27bfSGreg Kurz } 107360ce86c7SWei Liu 107460ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 107560ce86c7SWei Liu { 107660ce86c7SWei Liu mode_t ret; 107760ce86c7SWei Liu 107860ce86c7SWei Liu ret = mode & 0777; 107960ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 108060ce86c7SWei Liu ret |= S_IFDIR; 108160ce86c7SWei Liu } 108260ce86c7SWei Liu 108360ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 108460ce86c7SWei Liu ret |= S_IFLNK; 108560ce86c7SWei Liu } 108660ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 108760ce86c7SWei Liu ret |= S_IFSOCK; 108860ce86c7SWei Liu } 108960ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 109060ce86c7SWei Liu ret |= S_IFIFO; 109160ce86c7SWei Liu } 109260ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 109360ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 109460ce86c7SWei Liu ret |= S_IFCHR; 109560ce86c7SWei Liu } else { 109660ce86c7SWei Liu ret |= S_IFBLK; 109760ce86c7SWei Liu } 109860ce86c7SWei Liu } 109960ce86c7SWei Liu 110060ce86c7SWei Liu if (!(ret & ~0777)) { 110160ce86c7SWei Liu ret |= S_IFREG; 110260ce86c7SWei Liu } 110360ce86c7SWei Liu 110460ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 110560ce86c7SWei Liu ret |= S_ISUID; 110660ce86c7SWei Liu } 110760ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 110860ce86c7SWei Liu ret |= S_ISGID; 110960ce86c7SWei Liu } 111060ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 111160ce86c7SWei Liu ret |= S_ISVTX; 111260ce86c7SWei Liu } 111360ce86c7SWei Liu 111460ce86c7SWei Liu return ret; 111560ce86c7SWei Liu } 111660ce86c7SWei Liu 111760ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 111860ce86c7SWei Liu { 111960ce86c7SWei Liu if (stat->type == -1 && 112060ce86c7SWei Liu stat->dev == -1 && 112187032833SAntonios Motakis stat->qid.type == 0xff && 112287032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 112387032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 112460ce86c7SWei Liu stat->mode == -1 && 112560ce86c7SWei Liu stat->atime == -1 && 112660ce86c7SWei Liu stat->mtime == -1 && 112760ce86c7SWei Liu stat->length == -1 && 112860ce86c7SWei Liu !stat->name.size && 112960ce86c7SWei Liu !stat->uid.size && 113060ce86c7SWei Liu !stat->gid.size && 113160ce86c7SWei Liu !stat->muid.size && 113260ce86c7SWei Liu stat->n_uid == -1 && 113360ce86c7SWei Liu stat->n_gid == -1 && 113460ce86c7SWei Liu stat->n_muid == -1) { 113560ce86c7SWei Liu return 1; 113660ce86c7SWei Liu } 113760ce86c7SWei Liu 113860ce86c7SWei Liu return 0; 113960ce86c7SWei Liu } 114060ce86c7SWei Liu 114160ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 114260ce86c7SWei Liu { 114360ce86c7SWei Liu v9fs_string_init(&stat->name); 114460ce86c7SWei Liu v9fs_string_init(&stat->uid); 114560ce86c7SWei Liu v9fs_string_init(&stat->gid); 114660ce86c7SWei Liu v9fs_string_init(&stat->muid); 114760ce86c7SWei Liu v9fs_string_init(&stat->extension); 114860ce86c7SWei Liu } 114960ce86c7SWei Liu 115060ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 115160ce86c7SWei Liu { 115260ce86c7SWei Liu v9fs_string_free(&stat->name); 115360ce86c7SWei Liu v9fs_string_free(&stat->uid); 115460ce86c7SWei Liu v9fs_string_free(&stat->gid); 115560ce86c7SWei Liu v9fs_string_free(&stat->muid); 115660ce86c7SWei Liu v9fs_string_free(&stat->extension); 115760ce86c7SWei Liu } 115860ce86c7SWei Liu 115960ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 116060ce86c7SWei Liu { 116160ce86c7SWei Liu uint32_t mode; 116260ce86c7SWei Liu 116360ce86c7SWei Liu mode = stbuf->st_mode & 0777; 116460ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 116560ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 116660ce86c7SWei Liu } 116760ce86c7SWei Liu 116860ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 116960ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 117060ce86c7SWei Liu } 117160ce86c7SWei Liu 117260ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 117360ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 117460ce86c7SWei Liu } 117560ce86c7SWei Liu 117660ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 117760ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 117860ce86c7SWei Liu } 117960ce86c7SWei Liu 118060ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 118160ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 118260ce86c7SWei Liu } 118360ce86c7SWei Liu 118460ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 118560ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 118660ce86c7SWei Liu } 118760ce86c7SWei Liu 118860ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 118960ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 119060ce86c7SWei Liu } 119160ce86c7SWei Liu 119260ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 119360ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 119460ce86c7SWei Liu } 119560ce86c7SWei Liu 119660ce86c7SWei Liu return mode; 119760ce86c7SWei Liu } 119860ce86c7SWei Liu 11996069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 12006069537fSJan Dakinevich const char *basename, 120160ce86c7SWei Liu const struct stat *stbuf, 120260ce86c7SWei Liu V9fsStat *v9stat) 120360ce86c7SWei Liu { 120460ce86c7SWei Liu int err; 120560ce86c7SWei Liu 120660ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 120760ce86c7SWei Liu 12083b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12093b5ee9e8SAntonios Motakis if (err < 0) { 12103b5ee9e8SAntonios Motakis return err; 12113b5ee9e8SAntonios Motakis } 121260ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 121360ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 121460ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 121560ce86c7SWei Liu v9stat->length = stbuf->st_size; 121660ce86c7SWei Liu 1217abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1218abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1219abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 122060ce86c7SWei Liu 122160ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 122260ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 122360ce86c7SWei Liu v9stat->n_muid = 0; 122460ce86c7SWei Liu 1225abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 122660ce86c7SWei Liu 122760ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12286069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 122960ce86c7SWei Liu if (err < 0) { 123060ce86c7SWei Liu return err; 123160ce86c7SWei Liu } 123260ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 123360ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 123460ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 123560ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 123660ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 123760ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 123860ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 123960ce86c7SWei Liu } 124060ce86c7SWei Liu 12416069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 124260ce86c7SWei Liu 124360ce86c7SWei Liu v9stat->size = 61 + 124460ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 124560ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 124660ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 124760ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 124860ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 124960ce86c7SWei Liu return 0; 125060ce86c7SWei Liu } 125160ce86c7SWei Liu 125260ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 125360ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 125460ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 125560ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 125660ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 125760ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 125860ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 125960ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 126060ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 126160ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 126260ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 126360ce86c7SWei Liu 126460ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 126560ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 126660ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 126760ce86c7SWei Liu 126860ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 126960ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 127060ce86c7SWei Liu 127160ce86c7SWei Liu 1272b565bccbSChristian Schoenebeck /** 1273b565bccbSChristian Schoenebeck * Convert host filesystem's block size into an appropriate block size for 1274b565bccbSChristian Schoenebeck * 9p client (guest OS side). The value returned suggests an "optimum" block 1275b565bccbSChristian Schoenebeck * size for 9p I/O, i.e. to maximize performance. 1276b565bccbSChristian Schoenebeck * 1277b565bccbSChristian Schoenebeck * @pdu: 9p client request 1278b565bccbSChristian Schoenebeck * @blksize: host filesystem's block size 1279b565bccbSChristian Schoenebeck */ 1280b565bccbSChristian Schoenebeck static int32_t blksize_to_iounit(const V9fsPDU *pdu, int32_t blksize) 1281669ced09SChristian Schoenebeck { 1282669ced09SChristian Schoenebeck int32_t iounit = 0; 1283669ced09SChristian Schoenebeck V9fsState *s = pdu->s; 1284669ced09SChristian Schoenebeck 1285669ced09SChristian Schoenebeck /* 1286b565bccbSChristian Schoenebeck * iounit should be multiples of blksize (host filesystem block size) 1287669ced09SChristian Schoenebeck * as well as less than (client msize - P9_IOHDRSZ) 1288669ced09SChristian Schoenebeck */ 1289b565bccbSChristian Schoenebeck if (blksize) { 129004a7f9e5SChristian Schoenebeck iounit = QEMU_ALIGN_DOWN(s->msize - P9_IOHDRSZ, blksize); 1291669ced09SChristian Schoenebeck } 1292669ced09SChristian Schoenebeck if (!iounit) { 1293669ced09SChristian Schoenebeck iounit = s->msize - P9_IOHDRSZ; 1294669ced09SChristian Schoenebeck } 1295669ced09SChristian Schoenebeck return iounit; 1296669ced09SChristian Schoenebeck } 1297669ced09SChristian Schoenebeck 1298b565bccbSChristian Schoenebeck static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf) 1299b565bccbSChristian Schoenebeck { 1300b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, stbuf->st_blksize); 1301b565bccbSChristian Schoenebeck } 1302b565bccbSChristian Schoenebeck 13033b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 130460ce86c7SWei Liu V9fsStatDotl *v9lstat) 130560ce86c7SWei Liu { 130660ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 130760ce86c7SWei Liu 130860ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 130960ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 131060ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 131160ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 131260ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 131360ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 1314669ced09SChristian Schoenebeck v9lstat->st_blksize = stat_to_iounit(pdu, stbuf); 131560ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 131660ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 131760ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 131860ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 1319f41db099SKeno Fischer #ifdef CONFIG_DARWIN 1320f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atimespec.tv_nsec; 1321f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtimespec.tv_nsec; 1322f41db099SKeno Fischer v9lstat->st_ctime_nsec = stbuf->st_ctimespec.tv_nsec; 1323f41db099SKeno Fischer #else 1324f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 1325f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 132660ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 1327f41db099SKeno Fischer #endif 132860ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 132960ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 133060ce86c7SWei Liu 13313b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 133260ce86c7SWei Liu } 133360ce86c7SWei Liu 133460ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 133560ce86c7SWei Liu { 133660ce86c7SWei Liu int i; 133760ce86c7SWei Liu 133860ce86c7SWei Liu printf("sg[%d]: {", cnt); 133960ce86c7SWei Liu for (i = 0; i < cnt; i++) { 134060ce86c7SWei Liu if (i) { 134160ce86c7SWei Liu printf(", "); 134260ce86c7SWei Liu } 134360ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 134460ce86c7SWei Liu } 134560ce86c7SWei Liu printf("}\n"); 134660ce86c7SWei Liu } 134760ce86c7SWei Liu 134860ce86c7SWei Liu /* Will call this only for path name based fid */ 134960ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 135060ce86c7SWei Liu { 135160ce86c7SWei Liu V9fsPath str; 135260ce86c7SWei Liu v9fs_path_init(&str); 135360ce86c7SWei Liu v9fs_path_copy(&str, dst); 1354e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 135560ce86c7SWei Liu v9fs_path_free(&str); 135660ce86c7SWei Liu } 135760ce86c7SWei Liu 135860ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 135960ce86c7SWei Liu { 136060ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 136160ce86c7SWei Liu } 136260ce86c7SWei Liu 13638440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 136460ce86c7SWei Liu { 136560ce86c7SWei Liu ssize_t err; 136660ce86c7SWei Liu V9fsPDU *pdu = opaque; 136760ce86c7SWei Liu V9fsState *s = pdu->s; 136860ce86c7SWei Liu V9fsString version; 136960ce86c7SWei Liu size_t offset = 7; 137060ce86c7SWei Liu 137160ce86c7SWei Liu v9fs_string_init(&version); 137260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 137360ce86c7SWei Liu if (err < 0) { 137460ce86c7SWei Liu goto out; 137560ce86c7SWei Liu } 137660ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 137760ce86c7SWei Liu 137860ce86c7SWei Liu virtfs_reset(pdu); 137960ce86c7SWei Liu 138060ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 138160ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 138260ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 138360ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 138460ce86c7SWei Liu } else { 138560ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1386e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1387e16453a3SChristian Schoenebeck goto marshal; 138860ce86c7SWei Liu } 138960ce86c7SWei Liu 1390e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1391e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1392e16453a3SChristian Schoenebeck error_report( 1393e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1394e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1395e16453a3SChristian Schoenebeck ); 1396e16453a3SChristian Schoenebeck goto out; 1397e16453a3SChristian Schoenebeck } 1398e16453a3SChristian Schoenebeck 139962777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1400c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 140162777d82SChristian Schoenebeck warn_report_once( 140262777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 140362777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 140462777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 140562777d82SChristian Schoenebeck ); 140662777d82SChristian Schoenebeck } 140762777d82SChristian Schoenebeck 1408e16453a3SChristian Schoenebeck marshal: 140960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 141060ce86c7SWei Liu if (err < 0) { 141160ce86c7SWei Liu goto out; 141260ce86c7SWei Liu } 1413403a905bSPhilippe Mathieu-Daudé err += offset; 141460ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 141560ce86c7SWei Liu out: 1416403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 141760ce86c7SWei Liu v9fs_string_free(&version); 141860ce86c7SWei Liu } 141960ce86c7SWei Liu 14208440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 142160ce86c7SWei Liu { 142260ce86c7SWei Liu V9fsPDU *pdu = opaque; 142360ce86c7SWei Liu V9fsState *s = pdu->s; 142460ce86c7SWei Liu int32_t fid, afid, n_uname; 142560ce86c7SWei Liu V9fsString uname, aname; 142660ce86c7SWei Liu V9fsFidState *fidp; 142760ce86c7SWei Liu size_t offset = 7; 142860ce86c7SWei Liu V9fsQID qid; 142960ce86c7SWei Liu ssize_t err; 143011024375SChristian Schoenebeck struct stat stbuf; 143160ce86c7SWei Liu 143260ce86c7SWei Liu v9fs_string_init(&uname); 143360ce86c7SWei Liu v9fs_string_init(&aname); 143460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 143560ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 143660ce86c7SWei Liu if (err < 0) { 143760ce86c7SWei Liu goto out_nofid; 143860ce86c7SWei Liu } 143960ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 144060ce86c7SWei Liu 144160ce86c7SWei Liu fidp = alloc_fid(s, fid); 144260ce86c7SWei Liu if (fidp == NULL) { 144360ce86c7SWei Liu err = -EINVAL; 144460ce86c7SWei Liu goto out_nofid; 144560ce86c7SWei Liu } 144660ce86c7SWei Liu fidp->uid = n_uname; 144760ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 144860ce86c7SWei Liu if (err < 0) { 144960ce86c7SWei Liu err = -EINVAL; 145060ce86c7SWei Liu clunk_fid(s, fid); 145160ce86c7SWei Liu goto out; 145260ce86c7SWei Liu } 145311024375SChristian Schoenebeck err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 145411024375SChristian Schoenebeck if (err < 0) { 145511024375SChristian Schoenebeck err = -EINVAL; 145611024375SChristian Schoenebeck clunk_fid(s, fid); 145711024375SChristian Schoenebeck goto out; 145811024375SChristian Schoenebeck } 145911024375SChristian Schoenebeck err = stat_to_qid(pdu, &stbuf, &qid); 146060ce86c7SWei Liu if (err < 0) { 146160ce86c7SWei Liu err = -EINVAL; 146260ce86c7SWei Liu clunk_fid(s, fid); 146360ce86c7SWei Liu goto out; 146460ce86c7SWei Liu } 1465fe44dc91SAshijeet Acharya 1466fe44dc91SAshijeet Acharya /* 1467fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1468fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1469fe44dc91SAshijeet Acharya */ 1470fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1471fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1472fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1473fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14749261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14759261ef5eSMarkus Armbruster if (err < 0) { 1476fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1477fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1478fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1479fe44dc91SAshijeet Acharya goto out; 1480fe44dc91SAshijeet Acharya } 1481fe44dc91SAshijeet Acharya s->root_fid = fid; 1482fe44dc91SAshijeet Acharya } 1483fe44dc91SAshijeet Acharya 148460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 148560ce86c7SWei Liu if (err < 0) { 148660ce86c7SWei Liu clunk_fid(s, fid); 148760ce86c7SWei Liu goto out; 148860ce86c7SWei Liu } 148960ce86c7SWei Liu err += offset; 1490fe44dc91SAshijeet Acharya 149111024375SChristian Schoenebeck memcpy(&s->root_st, &stbuf, sizeof(stbuf)); 149260ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 149360ce86c7SWei Liu qid.type, qid.version, qid.path); 149460ce86c7SWei Liu out: 149560ce86c7SWei Liu put_fid(pdu, fidp); 149660ce86c7SWei Liu out_nofid: 149760ce86c7SWei Liu pdu_complete(pdu, err); 149860ce86c7SWei Liu v9fs_string_free(&uname); 149960ce86c7SWei Liu v9fs_string_free(&aname); 150060ce86c7SWei Liu } 150160ce86c7SWei Liu 15028440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 150360ce86c7SWei Liu { 150460ce86c7SWei Liu int32_t fid; 150560ce86c7SWei Liu V9fsStat v9stat; 150660ce86c7SWei Liu ssize_t err = 0; 150760ce86c7SWei Liu size_t offset = 7; 150860ce86c7SWei Liu struct stat stbuf; 150960ce86c7SWei Liu V9fsFidState *fidp; 151060ce86c7SWei Liu V9fsPDU *pdu = opaque; 15116069537fSJan Dakinevich char *basename; 151260ce86c7SWei Liu 151360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 151460ce86c7SWei Liu if (err < 0) { 151560ce86c7SWei Liu goto out_nofid; 151660ce86c7SWei Liu } 151760ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 151860ce86c7SWei Liu 151960ce86c7SWei Liu fidp = get_fid(pdu, fid); 152060ce86c7SWei Liu if (fidp == NULL) { 152160ce86c7SWei Liu err = -ENOENT; 152260ce86c7SWei Liu goto out_nofid; 152360ce86c7SWei Liu } 152460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 152560ce86c7SWei Liu if (err < 0) { 152660ce86c7SWei Liu goto out; 152760ce86c7SWei Liu } 15286069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 15296069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 15306069537fSJan Dakinevich g_free(basename); 153160ce86c7SWei Liu if (err < 0) { 153260ce86c7SWei Liu goto out; 153360ce86c7SWei Liu } 153460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 153560ce86c7SWei Liu if (err < 0) { 153660ce86c7SWei Liu v9fs_stat_free(&v9stat); 153760ce86c7SWei Liu goto out; 153860ce86c7SWei Liu } 153960ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 154060ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 154160ce86c7SWei Liu err += offset; 154260ce86c7SWei Liu v9fs_stat_free(&v9stat); 154360ce86c7SWei Liu out: 154460ce86c7SWei Liu put_fid(pdu, fidp); 154560ce86c7SWei Liu out_nofid: 154660ce86c7SWei Liu pdu_complete(pdu, err); 154760ce86c7SWei Liu } 154860ce86c7SWei Liu 15498440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 155060ce86c7SWei Liu { 155160ce86c7SWei Liu int32_t fid; 155260ce86c7SWei Liu size_t offset = 7; 155360ce86c7SWei Liu ssize_t retval = 0; 155460ce86c7SWei Liu struct stat stbuf; 155560ce86c7SWei Liu V9fsFidState *fidp; 155660ce86c7SWei Liu uint64_t request_mask; 155760ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 155860ce86c7SWei Liu V9fsPDU *pdu = opaque; 155960ce86c7SWei Liu 156060ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 156160ce86c7SWei Liu if (retval < 0) { 156260ce86c7SWei Liu goto out_nofid; 156360ce86c7SWei Liu } 156460ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 156560ce86c7SWei Liu 156660ce86c7SWei Liu fidp = get_fid(pdu, fid); 156760ce86c7SWei Liu if (fidp == NULL) { 156860ce86c7SWei Liu retval = -ENOENT; 156960ce86c7SWei Liu goto out_nofid; 157060ce86c7SWei Liu } 157160ce86c7SWei Liu /* 157260ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 157360ce86c7SWei Liu * need to look at request_mask. 157460ce86c7SWei Liu */ 157560ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 157660ce86c7SWei Liu if (retval < 0) { 157760ce86c7SWei Liu goto out; 157860ce86c7SWei Liu } 15793b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15803b5ee9e8SAntonios Motakis if (retval < 0) { 15813b5ee9e8SAntonios Motakis goto out; 15823b5ee9e8SAntonios Motakis } 158360ce86c7SWei Liu 158460ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 158560ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 158660ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 158760ce86c7SWei Liu switch (retval) { 158860ce86c7SWei Liu case 0: 158960ce86c7SWei Liu /* we have valid st_gen: update result mask */ 159060ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 159160ce86c7SWei Liu break; 159260ce86c7SWei Liu case -EINTR: 159360ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 159460ce86c7SWei Liu goto out; 159560ce86c7SWei Liu default: 159660ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 159760ce86c7SWei Liu break; 159860ce86c7SWei Liu } 159960ce86c7SWei Liu } 160060ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 160160ce86c7SWei Liu if (retval < 0) { 160260ce86c7SWei Liu goto out; 160360ce86c7SWei Liu } 160460ce86c7SWei Liu retval += offset; 160560ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 160660ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 160760ce86c7SWei Liu v9stat_dotl.st_gid); 160860ce86c7SWei Liu out: 160960ce86c7SWei Liu put_fid(pdu, fidp); 161060ce86c7SWei Liu out_nofid: 161160ce86c7SWei Liu pdu_complete(pdu, retval); 161260ce86c7SWei Liu } 161360ce86c7SWei Liu 161460ce86c7SWei Liu /* Attribute flags */ 161560ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 161660ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 161760ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 161860ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 161960ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 162060ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 162160ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 162260ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 162360ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 162460ce86c7SWei Liu 162560ce86c7SWei Liu #define P9_ATTR_MASK 127 162660ce86c7SWei Liu 16278440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 162860ce86c7SWei Liu { 162960ce86c7SWei Liu int err = 0; 163060ce86c7SWei Liu int32_t fid; 163160ce86c7SWei Liu V9fsFidState *fidp; 163260ce86c7SWei Liu size_t offset = 7; 163360ce86c7SWei Liu V9fsIattr v9iattr; 163460ce86c7SWei Liu V9fsPDU *pdu = opaque; 163560ce86c7SWei Liu 163660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 163760ce86c7SWei Liu if (err < 0) { 163860ce86c7SWei Liu goto out_nofid; 163960ce86c7SWei Liu } 164060ce86c7SWei Liu 16418f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16428f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16438f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16448f9c64bfSGreg Kurz 164560ce86c7SWei Liu fidp = get_fid(pdu, fid); 164660ce86c7SWei Liu if (fidp == NULL) { 164760ce86c7SWei Liu err = -EINVAL; 164860ce86c7SWei Liu goto out_nofid; 164960ce86c7SWei Liu } 165060ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 165160ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 165260ce86c7SWei Liu if (err < 0) { 165360ce86c7SWei Liu goto out; 165460ce86c7SWei Liu } 165560ce86c7SWei Liu } 165660ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 165760ce86c7SWei Liu struct timespec times[2]; 165860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 165960ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 166060ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 166160ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 166260ce86c7SWei Liu } else { 166360ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 166460ce86c7SWei Liu } 166560ce86c7SWei Liu } else { 166660ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 166760ce86c7SWei Liu } 166860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 166960ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 167060ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 167160ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 167260ce86c7SWei Liu } else { 167360ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 167460ce86c7SWei Liu } 167560ce86c7SWei Liu } else { 167660ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 167760ce86c7SWei Liu } 167860ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 167960ce86c7SWei Liu if (err < 0) { 168060ce86c7SWei Liu goto out; 168160ce86c7SWei Liu } 168260ce86c7SWei Liu } 168360ce86c7SWei Liu /* 168460ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 168560ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 168660ce86c7SWei Liu */ 168760ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 168860ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 168960ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 169060ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 169160ce86c7SWei Liu v9iattr.uid = -1; 169260ce86c7SWei Liu } 169360ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 169460ce86c7SWei Liu v9iattr.gid = -1; 169560ce86c7SWei Liu } 169660ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 169760ce86c7SWei Liu v9iattr.gid); 169860ce86c7SWei Liu if (err < 0) { 169960ce86c7SWei Liu goto out; 170060ce86c7SWei Liu } 170160ce86c7SWei Liu } 170260ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 170360ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 170460ce86c7SWei Liu if (err < 0) { 170560ce86c7SWei Liu goto out; 170660ce86c7SWei Liu } 170760ce86c7SWei Liu } 170860ce86c7SWei Liu err = offset; 17098f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 171060ce86c7SWei Liu out: 171160ce86c7SWei Liu put_fid(pdu, fidp); 171260ce86c7SWei Liu out_nofid: 171360ce86c7SWei Liu pdu_complete(pdu, err); 171460ce86c7SWei Liu } 171560ce86c7SWei Liu 171660ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 171760ce86c7SWei Liu { 171860ce86c7SWei Liu int i; 171960ce86c7SWei Liu ssize_t err; 172060ce86c7SWei Liu size_t offset = 7; 172160ce86c7SWei Liu 172260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 172360ce86c7SWei Liu if (err < 0) { 172460ce86c7SWei Liu return err; 172560ce86c7SWei Liu } 172660ce86c7SWei Liu offset += err; 172760ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 172860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 172960ce86c7SWei Liu if (err < 0) { 173060ce86c7SWei Liu return err; 173160ce86c7SWei Liu } 173260ce86c7SWei Liu offset += err; 173360ce86c7SWei Liu } 173460ce86c7SWei Liu return offset; 173560ce86c7SWei Liu } 173660ce86c7SWei Liu 1737fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1738fff39a7aSGreg Kurz { 1739fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1740fff39a7aSGreg Kurz } 1741fff39a7aSGreg Kurz 1742f22cad42SChristian Schoenebeck static bool same_stat_id(const struct stat *a, const struct stat *b) 174356f101ecSGreg Kurz { 1744f22cad42SChristian Schoenebeck return a->st_dev == b->st_dev && a->st_ino == b->st_ino; 174556f101ecSGreg Kurz } 174656f101ecSGreg Kurz 17478440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 174860ce86c7SWei Liu { 174960ce86c7SWei Liu int name_idx; 1750869605b5SChristian Schoenebeck g_autofree V9fsQID *qids = NULL; 175160ce86c7SWei Liu int i, err = 0; 17527e985780SChristian Schoenebeck V9fsPath dpath, path; 17537e985780SChristian Schoenebeck P9ARRAY_REF(V9fsPath) pathes = NULL; 175460ce86c7SWei Liu uint16_t nwnames; 1755869605b5SChristian Schoenebeck struct stat stbuf, fidst; 1756869605b5SChristian Schoenebeck g_autofree struct stat *stbufs = NULL; 175760ce86c7SWei Liu size_t offset = 7; 175860ce86c7SWei Liu int32_t fid, newfid; 17597e985780SChristian Schoenebeck P9ARRAY_REF(V9fsString) wnames = NULL; 176060ce86c7SWei Liu V9fsFidState *fidp; 176160ce86c7SWei Liu V9fsFidState *newfidp = NULL; 176260ce86c7SWei Liu V9fsPDU *pdu = opaque; 176360ce86c7SWei Liu V9fsState *s = pdu->s; 176456f101ecSGreg Kurz V9fsQID qid; 176560ce86c7SWei Liu 176660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 176760ce86c7SWei Liu if (err < 0) { 176860ce86c7SWei Liu pdu_complete(pdu, err); 176960ce86c7SWei Liu return ; 177060ce86c7SWei Liu } 177160ce86c7SWei Liu offset += err; 177260ce86c7SWei Liu 177360ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 177460ce86c7SWei Liu 1775232a4d2cSChristian Schoenebeck if (nwnames > P9_MAXWELEM) { 1776232a4d2cSChristian Schoenebeck err = -EINVAL; 1777232a4d2cSChristian Schoenebeck goto out_nofid; 1778232a4d2cSChristian Schoenebeck } 1779232a4d2cSChristian Schoenebeck if (nwnames) { 17807e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsString, wnames, nwnames); 17811923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 17828d6cb100SChristian Schoenebeck stbufs = g_new0(struct stat, nwnames); 17837e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsPath, pathes, nwnames); 178460ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 178560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 178660ce86c7SWei Liu if (err < 0) { 178760ce86c7SWei Liu goto out_nofid; 178860ce86c7SWei Liu } 1789fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1790fff39a7aSGreg Kurz err = -ENOENT; 1791fff39a7aSGreg Kurz goto out_nofid; 1792fff39a7aSGreg Kurz } 179360ce86c7SWei Liu offset += err; 179460ce86c7SWei Liu } 179560ce86c7SWei Liu } 179660ce86c7SWei Liu fidp = get_fid(pdu, fid); 179760ce86c7SWei Liu if (fidp == NULL) { 179860ce86c7SWei Liu err = -ENOENT; 179960ce86c7SWei Liu goto out_nofid; 180060ce86c7SWei Liu } 180156f101ecSGreg Kurz 180213fd08e6SGreg Kurz v9fs_path_init(&dpath); 180313fd08e6SGreg Kurz v9fs_path_init(&path); 180460ce86c7SWei Liu /* 18058d6cb100SChristian Schoenebeck * Both dpath and path initially point to fidp. 180660ce86c7SWei Liu * Needed to handle request with nwnames == 0 180760ce86c7SWei Liu */ 180860ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 180960ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 18108d6cb100SChristian Schoenebeck 18118d6cb100SChristian Schoenebeck /* 18128d6cb100SChristian Schoenebeck * To keep latency (i.e. overall execution time for processing this 18138d6cb100SChristian Schoenebeck * Twalk client request) as small as possible, run all the required fs 18148d6cb100SChristian Schoenebeck * driver code altogether inside the following block. 18158d6cb100SChristian Schoenebeck */ 18168d6cb100SChristian Schoenebeck v9fs_co_run_in_worker({ 18178d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18188d6cb100SChristian Schoenebeck err = -EINTR; 18198d6cb100SChristian Schoenebeck break; 18208d6cb100SChristian Schoenebeck } 18218d6cb100SChristian Schoenebeck err = s->ops->lstat(&s->ctx, &dpath, &fidst); 18228d6cb100SChristian Schoenebeck if (err < 0) { 18238d6cb100SChristian Schoenebeck err = -errno; 18248d6cb100SChristian Schoenebeck break; 18258d6cb100SChristian Schoenebeck } 18268d6cb100SChristian Schoenebeck stbuf = fidst; 182760ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 18288d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18298d6cb100SChristian Schoenebeck err = -EINTR; 18308d6cb100SChristian Schoenebeck break; 18318d6cb100SChristian Schoenebeck } 1832f22cad42SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18338d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18348d6cb100SChristian Schoenebeck { 18358d6cb100SChristian Schoenebeck err = s->ops->name_to_path(&s->ctx, &dpath, 183697b1d8fdSChristian Schoenebeck wnames[name_idx].data, 183797b1d8fdSChristian Schoenebeck &pathes[name_idx]); 18388d6cb100SChristian Schoenebeck if (err < 0) { 18398d6cb100SChristian Schoenebeck err = -errno; 18408d6cb100SChristian Schoenebeck break; 18418d6cb100SChristian Schoenebeck } 18428d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18438d6cb100SChristian Schoenebeck err = -EINTR; 18448d6cb100SChristian Schoenebeck break; 18458d6cb100SChristian Schoenebeck } 184697b1d8fdSChristian Schoenebeck err = s->ops->lstat(&s->ctx, &pathes[name_idx], &stbuf); 18478d6cb100SChristian Schoenebeck if (err < 0) { 18488d6cb100SChristian Schoenebeck err = -errno; 18498d6cb100SChristian Schoenebeck break; 18508d6cb100SChristian Schoenebeck } 18518d6cb100SChristian Schoenebeck stbufs[name_idx] = stbuf; 185297b1d8fdSChristian Schoenebeck v9fs_path_copy(&dpath, &pathes[name_idx]); 18538d6cb100SChristian Schoenebeck } 18548d6cb100SChristian Schoenebeck } 18558d6cb100SChristian Schoenebeck }); 18568d6cb100SChristian Schoenebeck /* 18578d6cb100SChristian Schoenebeck * Handle all the rest of this Twalk request on main thread ... 18588d6cb100SChristian Schoenebeck */ 185960ce86c7SWei Liu if (err < 0) { 186060ce86c7SWei Liu goto out; 186160ce86c7SWei Liu } 186256f101ecSGreg Kurz 18638d6cb100SChristian Schoenebeck err = stat_to_qid(pdu, &fidst, &qid); 186460ce86c7SWei Liu if (err < 0) { 186560ce86c7SWei Liu goto out; 186660ce86c7SWei Liu } 18678d6cb100SChristian Schoenebeck stbuf = fidst; 18688d6cb100SChristian Schoenebeck 18698d6cb100SChristian Schoenebeck /* reset dpath and path */ 18708d6cb100SChristian Schoenebeck v9fs_path_copy(&dpath, &fidp->path); 18718d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &fidp->path); 18728d6cb100SChristian Schoenebeck 18738d6cb100SChristian Schoenebeck for (name_idx = 0; name_idx < nwnames; name_idx++) { 18748d6cb100SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18758d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18768d6cb100SChristian Schoenebeck { 18778d6cb100SChristian Schoenebeck stbuf = stbufs[name_idx]; 18783b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18793b5ee9e8SAntonios Motakis if (err < 0) { 18803b5ee9e8SAntonios Motakis goto out; 18813b5ee9e8SAntonios Motakis } 18828d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &pathes[name_idx]); 188360ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 188460ce86c7SWei Liu } 188556f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 188656f101ecSGreg Kurz } 188760ce86c7SWei Liu if (fid == newfid) { 188849dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 188949dd946bSGreg Kurz err = -EINVAL; 189049dd946bSGreg Kurz goto out; 189149dd946bSGreg Kurz } 18925b3c77aaSGreg Kurz v9fs_path_write_lock(s); 189360ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 18945b3c77aaSGreg Kurz v9fs_path_unlock(s); 189560ce86c7SWei Liu } else { 189660ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 189760ce86c7SWei Liu if (newfidp == NULL) { 189860ce86c7SWei Liu err = -EINVAL; 189960ce86c7SWei Liu goto out; 190060ce86c7SWei Liu } 190160ce86c7SWei Liu newfidp->uid = fidp->uid; 190260ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 190360ce86c7SWei Liu } 190460ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 190560ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 190660ce86c7SWei Liu out: 190760ce86c7SWei Liu put_fid(pdu, fidp); 190860ce86c7SWei Liu if (newfidp) { 190960ce86c7SWei Liu put_fid(pdu, newfidp); 191060ce86c7SWei Liu } 191160ce86c7SWei Liu v9fs_path_free(&dpath); 191260ce86c7SWei Liu v9fs_path_free(&path); 191360ce86c7SWei Liu out_nofid: 191460ce86c7SWei Liu pdu_complete(pdu, err); 191560ce86c7SWei Liu } 191660ce86c7SWei Liu 19178440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 191860ce86c7SWei Liu { 191960ce86c7SWei Liu struct statfs stbuf; 1920b565bccbSChristian Schoenebeck int err = v9fs_co_statfs(pdu, path, &stbuf); 192160ce86c7SWei Liu 1922b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, (err >= 0) ? stbuf.f_bsize : 0); 192360ce86c7SWei Liu } 192460ce86c7SWei Liu 19258440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 192660ce86c7SWei Liu { 192760ce86c7SWei Liu int flags; 192860ce86c7SWei Liu int32_t fid; 192960ce86c7SWei Liu int32_t mode; 193060ce86c7SWei Liu V9fsQID qid; 193160ce86c7SWei Liu int iounit = 0; 193260ce86c7SWei Liu ssize_t err = 0; 193360ce86c7SWei Liu size_t offset = 7; 193460ce86c7SWei Liu struct stat stbuf; 193560ce86c7SWei Liu V9fsFidState *fidp; 193660ce86c7SWei Liu V9fsPDU *pdu = opaque; 193760ce86c7SWei Liu V9fsState *s = pdu->s; 193860ce86c7SWei Liu 193960ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 194060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 194160ce86c7SWei Liu } else { 194260ce86c7SWei Liu uint8_t modebyte; 194360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 194460ce86c7SWei Liu mode = modebyte; 194560ce86c7SWei Liu } 194660ce86c7SWei Liu if (err < 0) { 194760ce86c7SWei Liu goto out_nofid; 194860ce86c7SWei Liu } 194960ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 195060ce86c7SWei Liu 195160ce86c7SWei Liu fidp = get_fid(pdu, fid); 195260ce86c7SWei Liu if (fidp == NULL) { 195360ce86c7SWei Liu err = -ENOENT; 195460ce86c7SWei Liu goto out_nofid; 195560ce86c7SWei Liu } 195649dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 195749dd946bSGreg Kurz err = -EINVAL; 195849dd946bSGreg Kurz goto out; 195949dd946bSGreg Kurz } 196060ce86c7SWei Liu 196160ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 196260ce86c7SWei Liu if (err < 0) { 196360ce86c7SWei Liu goto out; 196460ce86c7SWei Liu } 19653b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19663b5ee9e8SAntonios Motakis if (err < 0) { 19673b5ee9e8SAntonios Motakis goto out; 19683b5ee9e8SAntonios Motakis } 196960ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 197060ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 197160ce86c7SWei Liu if (err < 0) { 197260ce86c7SWei Liu goto out; 197360ce86c7SWei Liu } 197460ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 197560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 197660ce86c7SWei Liu if (err < 0) { 197760ce86c7SWei Liu goto out; 197860ce86c7SWei Liu } 197960ce86c7SWei Liu err += offset; 198060ce86c7SWei Liu } else { 198160ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 198260ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 198360ce86c7SWei Liu } else { 198460ce86c7SWei Liu flags = omode_to_uflags(mode); 198560ce86c7SWei Liu } 198660ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 198760ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 198860ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 198960ce86c7SWei Liu err = -EROFS; 199060ce86c7SWei Liu goto out; 199160ce86c7SWei Liu } 199260ce86c7SWei Liu } 199360ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 199460ce86c7SWei Liu if (err < 0) { 199560ce86c7SWei Liu goto out; 199660ce86c7SWei Liu } 199760ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 199860ce86c7SWei Liu fidp->open_flags = flags; 199960ce86c7SWei Liu if (flags & O_EXCL) { 200060ce86c7SWei Liu /* 200160ce86c7SWei Liu * We let the host file system do O_EXCL check 200260ce86c7SWei Liu * We should not reclaim such fd 200360ce86c7SWei Liu */ 200460ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 200560ce86c7SWei Liu } 200660ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 200760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 200860ce86c7SWei Liu if (err < 0) { 200960ce86c7SWei Liu goto out; 201060ce86c7SWei Liu } 201160ce86c7SWei Liu err += offset; 201260ce86c7SWei Liu } 201360ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 201460ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 201560ce86c7SWei Liu out: 201660ce86c7SWei Liu put_fid(pdu, fidp); 201760ce86c7SWei Liu out_nofid: 201860ce86c7SWei Liu pdu_complete(pdu, err); 201960ce86c7SWei Liu } 202060ce86c7SWei Liu 20218440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 202260ce86c7SWei Liu { 202360ce86c7SWei Liu int32_t dfid, flags, mode; 202460ce86c7SWei Liu gid_t gid; 202560ce86c7SWei Liu ssize_t err = 0; 202660ce86c7SWei Liu ssize_t offset = 7; 202760ce86c7SWei Liu V9fsString name; 202860ce86c7SWei Liu V9fsFidState *fidp; 202960ce86c7SWei Liu struct stat stbuf; 203060ce86c7SWei Liu V9fsQID qid; 203160ce86c7SWei Liu int32_t iounit; 203260ce86c7SWei Liu V9fsPDU *pdu = opaque; 203360ce86c7SWei Liu 203460ce86c7SWei Liu v9fs_string_init(&name); 203560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 203660ce86c7SWei Liu &name, &flags, &mode, &gid); 203760ce86c7SWei Liu if (err < 0) { 203860ce86c7SWei Liu goto out_nofid; 203960ce86c7SWei Liu } 204060ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 204160ce86c7SWei Liu 2042fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2043fff39a7aSGreg Kurz err = -ENOENT; 2044fff39a7aSGreg Kurz goto out_nofid; 2045fff39a7aSGreg Kurz } 2046fff39a7aSGreg Kurz 2047805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2048805b5d98SGreg Kurz err = -EEXIST; 2049805b5d98SGreg Kurz goto out_nofid; 2050805b5d98SGreg Kurz } 2051805b5d98SGreg Kurz 205260ce86c7SWei Liu fidp = get_fid(pdu, dfid); 205360ce86c7SWei Liu if (fidp == NULL) { 205460ce86c7SWei Liu err = -ENOENT; 205560ce86c7SWei Liu goto out_nofid; 205660ce86c7SWei Liu } 2057d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2058d63fb193SLi Qiang err = -EINVAL; 2059d63fb193SLi Qiang goto out; 2060d63fb193SLi Qiang } 206160ce86c7SWei Liu 206260ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 206360ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 206460ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 206560ce86c7SWei Liu if (err < 0) { 206660ce86c7SWei Liu goto out; 206760ce86c7SWei Liu } 206860ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 206960ce86c7SWei Liu fidp->open_flags = flags; 207060ce86c7SWei Liu if (flags & O_EXCL) { 207160ce86c7SWei Liu /* 207260ce86c7SWei Liu * We let the host file system do O_EXCL check 207360ce86c7SWei Liu * We should not reclaim such fd 207460ce86c7SWei Liu */ 207560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 207660ce86c7SWei Liu } 207760ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20783b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20793b5ee9e8SAntonios Motakis if (err < 0) { 20803b5ee9e8SAntonios Motakis goto out; 20813b5ee9e8SAntonios Motakis } 208260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 208360ce86c7SWei Liu if (err < 0) { 208460ce86c7SWei Liu goto out; 208560ce86c7SWei Liu } 208660ce86c7SWei Liu err += offset; 208760ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 208860ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 208960ce86c7SWei Liu out: 209060ce86c7SWei Liu put_fid(pdu, fidp); 209160ce86c7SWei Liu out_nofid: 209260ce86c7SWei Liu pdu_complete(pdu, err); 209360ce86c7SWei Liu v9fs_string_free(&name); 209460ce86c7SWei Liu } 209560ce86c7SWei Liu 2096a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 209760ce86c7SWei Liu { 209860ce86c7SWei Liu int err; 209960ce86c7SWei Liu int32_t fid; 210060ce86c7SWei Liu int datasync; 210160ce86c7SWei Liu size_t offset = 7; 210260ce86c7SWei Liu V9fsFidState *fidp; 210360ce86c7SWei Liu V9fsPDU *pdu = opaque; 210460ce86c7SWei Liu 210560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 210660ce86c7SWei Liu if (err < 0) { 210760ce86c7SWei Liu goto out_nofid; 210860ce86c7SWei Liu } 210960ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 211060ce86c7SWei Liu 211160ce86c7SWei Liu fidp = get_fid(pdu, fid); 211260ce86c7SWei Liu if (fidp == NULL) { 211360ce86c7SWei Liu err = -ENOENT; 211460ce86c7SWei Liu goto out_nofid; 211560ce86c7SWei Liu } 211660ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 211760ce86c7SWei Liu if (!err) { 211860ce86c7SWei Liu err = offset; 211960ce86c7SWei Liu } 212060ce86c7SWei Liu put_fid(pdu, fidp); 212160ce86c7SWei Liu out_nofid: 212260ce86c7SWei Liu pdu_complete(pdu, err); 212360ce86c7SWei Liu } 212460ce86c7SWei Liu 21258440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 212660ce86c7SWei Liu { 212760ce86c7SWei Liu int err; 212860ce86c7SWei Liu int32_t fid; 212960ce86c7SWei Liu size_t offset = 7; 213060ce86c7SWei Liu V9fsFidState *fidp; 213160ce86c7SWei Liu V9fsPDU *pdu = opaque; 213260ce86c7SWei Liu V9fsState *s = pdu->s; 213360ce86c7SWei Liu 213460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 213560ce86c7SWei Liu if (err < 0) { 213660ce86c7SWei Liu goto out_nofid; 213760ce86c7SWei Liu } 213860ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 213960ce86c7SWei Liu 214060ce86c7SWei Liu fidp = clunk_fid(s, fid); 214160ce86c7SWei Liu if (fidp == NULL) { 214260ce86c7SWei Liu err = -ENOENT; 214360ce86c7SWei Liu goto out_nofid; 214460ce86c7SWei Liu } 214560ce86c7SWei Liu /* 214660ce86c7SWei Liu * Bump the ref so that put_fid will 214760ce86c7SWei Liu * free the fid. 214860ce86c7SWei Liu */ 214960ce86c7SWei Liu fidp->ref++; 215060ce86c7SWei Liu err = put_fid(pdu, fidp); 215160ce86c7SWei Liu if (!err) { 215260ce86c7SWei Liu err = offset; 215360ce86c7SWei Liu } 215460ce86c7SWei Liu out_nofid: 215560ce86c7SWei Liu pdu_complete(pdu, err); 215660ce86c7SWei Liu } 215760ce86c7SWei Liu 2158bcb8998fSStefano Stabellini /* 2159bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2160bcb8998fSStefano Stabellini * 2161bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2162bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2163bcb8998fSStefano Stabellini * @size: number of bytes to include 2164bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2165bcb8998fSStefano Stabellini * 2166bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2167bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2168bcb8998fSStefano Stabellini */ 2169bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2170cf45183bSStefano Stabellini size_t skip, size_t size, 2171bcb8998fSStefano Stabellini bool is_write) 2172bcb8998fSStefano Stabellini { 2173bcb8998fSStefano Stabellini QEMUIOVector elem; 2174bcb8998fSStefano Stabellini struct iovec *iov; 2175bcb8998fSStefano Stabellini unsigned int niov; 2176bcb8998fSStefano Stabellini 217788da0b03SStefano Stabellini if (is_write) { 2178cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 217988da0b03SStefano Stabellini } else { 2180cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 218188da0b03SStefano Stabellini } 2182bcb8998fSStefano Stabellini 2183bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2184bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2185cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2186bcb8998fSStefano Stabellini } 2187bcb8998fSStefano Stabellini 218860ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 218960ce86c7SWei Liu uint64_t off, uint32_t max_count) 219060ce86c7SWei Liu { 219160ce86c7SWei Liu ssize_t err; 219260ce86c7SWei Liu size_t offset = 7; 2193cf45183bSStefano Stabellini uint64_t read_count; 2194bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 219560ce86c7SWei Liu 21967e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21977e55d65cSLi Qiang read_count = 0; 219816724a17SGreg Kurz } else { 2199cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2200cf45183bSStefano Stabellini } 2201cf45183bSStefano Stabellini if (read_count > max_count) { 220260ce86c7SWei Liu read_count = max_count; 220360ce86c7SWei Liu } 220460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 220560ce86c7SWei Liu if (err < 0) { 220660ce86c7SWei Liu return err; 220760ce86c7SWei Liu } 220860ce86c7SWei Liu offset += err; 220900588a0aSWei Liu 2210cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2211fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 221260ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 221360ce86c7SWei Liu read_count); 2214bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 221560ce86c7SWei Liu if (err < 0) { 221660ce86c7SWei Liu return err; 221760ce86c7SWei Liu } 221860ce86c7SWei Liu offset += err; 221960ce86c7SWei Liu return offset; 222060ce86c7SWei Liu } 222160ce86c7SWei Liu 22228440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 22238440e22eSGreg Kurz V9fsFidState *fidp, 22248440e22eSGreg Kurz uint32_t max_count) 222560ce86c7SWei Liu { 222660ce86c7SWei Liu V9fsPath path; 222760ce86c7SWei Liu V9fsStat v9stat; 222860ce86c7SWei Liu int len, err = 0; 222960ce86c7SWei Liu int32_t count = 0; 223060ce86c7SWei Liu struct stat stbuf; 223160ce86c7SWei Liu off_t saved_dir_pos; 2232635324e8SGreg Kurz struct dirent *dent; 223360ce86c7SWei Liu 223460ce86c7SWei Liu /* save the directory position */ 223560ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 223660ce86c7SWei Liu if (saved_dir_pos < 0) { 223760ce86c7SWei Liu return saved_dir_pos; 223860ce86c7SWei Liu } 223960ce86c7SWei Liu 224060ce86c7SWei Liu while (1) { 224160ce86c7SWei Liu v9fs_path_init(&path); 22427cde47d4SGreg Kurz 22437cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 22447cde47d4SGreg Kurz 2245635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2246635324e8SGreg Kurz if (err || !dent) { 224760ce86c7SWei Liu break; 224860ce86c7SWei Liu } 224960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 225060ce86c7SWei Liu if (err < 0) { 22518762a46dSGreg Kurz break; 225260ce86c7SWei Liu } 225360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 225460ce86c7SWei Liu if (err < 0) { 22558762a46dSGreg Kurz break; 225660ce86c7SWei Liu } 22576069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 225860ce86c7SWei Liu if (err < 0) { 22598762a46dSGreg Kurz break; 226060ce86c7SWei Liu } 2261772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 22627cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22637cde47d4SGreg Kurz 226460ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 226560ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 226660ce86c7SWei Liu v9fs_stat_free(&v9stat); 226760ce86c7SWei Liu v9fs_path_free(&path); 226860ce86c7SWei Liu return count; 226960ce86c7SWei Liu } 2270772a7369SJan Dakinevich 2271772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2272772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2273772a7369SJan Dakinevich 2274772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2275772a7369SJan Dakinevich 2276772a7369SJan Dakinevich if (len < 0) { 2277772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2278772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2279772a7369SJan Dakinevich v9fs_path_free(&path); 2280772a7369SJan Dakinevich return len; 2281772a7369SJan Dakinevich } 228260ce86c7SWei Liu count += len; 228360ce86c7SWei Liu v9fs_stat_free(&v9stat); 228460ce86c7SWei Liu v9fs_path_free(&path); 2285*6b3b279bSKeno Fischer saved_dir_pos = qemu_dirent_off(dent); 228660ce86c7SWei Liu } 22878762a46dSGreg Kurz 22887cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22897cde47d4SGreg Kurz 229060ce86c7SWei Liu v9fs_path_free(&path); 229160ce86c7SWei Liu if (err < 0) { 229260ce86c7SWei Liu return err; 229360ce86c7SWei Liu } 229460ce86c7SWei Liu return count; 229560ce86c7SWei Liu } 229660ce86c7SWei Liu 22978440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 229860ce86c7SWei Liu { 229960ce86c7SWei Liu int32_t fid; 230060ce86c7SWei Liu uint64_t off; 230160ce86c7SWei Liu ssize_t err = 0; 230260ce86c7SWei Liu int32_t count = 0; 230360ce86c7SWei Liu size_t offset = 7; 230460ce86c7SWei Liu uint32_t max_count; 230560ce86c7SWei Liu V9fsFidState *fidp; 230660ce86c7SWei Liu V9fsPDU *pdu = opaque; 230760ce86c7SWei Liu V9fsState *s = pdu->s; 230860ce86c7SWei Liu 230960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 231060ce86c7SWei Liu if (err < 0) { 231160ce86c7SWei Liu goto out_nofid; 231260ce86c7SWei Liu } 231360ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 231460ce86c7SWei Liu 231560ce86c7SWei Liu fidp = get_fid(pdu, fid); 231660ce86c7SWei Liu if (fidp == NULL) { 231760ce86c7SWei Liu err = -EINVAL; 231860ce86c7SWei Liu goto out_nofid; 231960ce86c7SWei Liu } 232060ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2321d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2322d2c5cf7cSChristian Schoenebeck warn_report_once( 2323d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2324d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2325d2c5cf7cSChristian Schoenebeck ); 2326d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2327d2c5cf7cSChristian Schoenebeck goto out; 2328d2c5cf7cSChristian Schoenebeck } 232960ce86c7SWei Liu if (off == 0) { 233060ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 233160ce86c7SWei Liu } 233260ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 233360ce86c7SWei Liu if (count < 0) { 233460ce86c7SWei Liu err = count; 233560ce86c7SWei Liu goto out; 233660ce86c7SWei Liu } 233760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 233860ce86c7SWei Liu if (err < 0) { 233960ce86c7SWei Liu goto out; 234060ce86c7SWei Liu } 234160ce86c7SWei Liu err += offset + count; 234260ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 234360ce86c7SWei Liu QEMUIOVector qiov_full; 234460ce86c7SWei Liu QEMUIOVector qiov; 234560ce86c7SWei Liu int32_t len; 234660ce86c7SWei Liu 2347cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 234860ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 234960ce86c7SWei Liu do { 235060ce86c7SWei Liu qemu_iovec_reset(&qiov); 235160ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 235260ce86c7SWei Liu if (0) { 235360ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 235460ce86c7SWei Liu } 235560ce86c7SWei Liu /* Loop in case of EINTR */ 235660ce86c7SWei Liu do { 235760ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 235860ce86c7SWei Liu if (len >= 0) { 235960ce86c7SWei Liu off += len; 236060ce86c7SWei Liu count += len; 236160ce86c7SWei Liu } 236260ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 236360ce86c7SWei Liu if (len < 0) { 236460ce86c7SWei Liu /* IO error return the error */ 236560ce86c7SWei Liu err = len; 2366e95c9a49SLi Qiang goto out_free_iovec; 236760ce86c7SWei Liu } 236860ce86c7SWei Liu } while (count < max_count && len > 0); 236960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 237060ce86c7SWei Liu if (err < 0) { 2371e95c9a49SLi Qiang goto out_free_iovec; 237260ce86c7SWei Liu } 237360ce86c7SWei Liu err += offset + count; 2374e95c9a49SLi Qiang out_free_iovec: 237560ce86c7SWei Liu qemu_iovec_destroy(&qiov); 237660ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 237760ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 237860ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 237960ce86c7SWei Liu } else { 238060ce86c7SWei Liu err = -EINVAL; 238160ce86c7SWei Liu } 238260ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 238360ce86c7SWei Liu out: 238460ce86c7SWei Liu put_fid(pdu, fidp); 238560ce86c7SWei Liu out_nofid: 238660ce86c7SWei Liu pdu_complete(pdu, err); 238760ce86c7SWei Liu } 238860ce86c7SWei Liu 238929c9d2caSChristian Schoenebeck /** 239029c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 239129c9d2caSChristian Schoenebeck * 239229c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 239329c9d2caSChristian Schoenebeck * @returns required size in bytes 239429c9d2caSChristian Schoenebeck */ 239529c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 239660ce86c7SWei Liu { 239760ce86c7SWei Liu /* 239860ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 239960ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 240060ce86c7SWei Liu */ 240160ce86c7SWei Liu return 24 + v9fs_string_size(name); 240260ce86c7SWei Liu } 240360ce86c7SWei Liu 24040c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 24050c4356baSChristian Schoenebeck { 24060c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 24070c4356baSChristian Schoenebeck 24080c4356baSChristian Schoenebeck for (; e; e = next) { 24090c4356baSChristian Schoenebeck next = e->next; 24100c4356baSChristian Schoenebeck g_free(e->dent); 24110c4356baSChristian Schoenebeck g_free(e->st); 24120c4356baSChristian Schoenebeck g_free(e); 24130c4356baSChristian Schoenebeck } 24140c4356baSChristian Schoenebeck } 24150c4356baSChristian Schoenebeck 24168440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 24170c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 241860ce86c7SWei Liu { 241960ce86c7SWei Liu size_t size; 242060ce86c7SWei Liu V9fsQID qid; 242160ce86c7SWei Liu V9fsString name; 242260ce86c7SWei Liu int len, err = 0; 242360ce86c7SWei Liu int32_t count = 0; 2424*6b3b279bSKeno Fischer off_t off; 2425635324e8SGreg Kurz struct dirent *dent; 24260c4356baSChristian Schoenebeck struct stat *st; 24270c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 242860ce86c7SWei Liu 24290c4356baSChristian Schoenebeck /* 24300c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 24310c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 24320c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 24330c4356baSChristian Schoenebeck */ 24340c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 24350c4356baSChristian Schoenebeck 24360c4356baSChristian Schoenebeck /* 24370c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 24380c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 24390c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 24400c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 24410c4356baSChristian Schoenebeck */ 24420c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 24430c4356baSChristian Schoenebeck dostat); 24440c4356baSChristian Schoenebeck if (count < 0) { 24450c4356baSChristian Schoenebeck err = count; 24460c4356baSChristian Schoenebeck count = 0; 24470c4356baSChristian Schoenebeck goto out; 244860ce86c7SWei Liu } 24490c4356baSChristian Schoenebeck count = 0; 245060ce86c7SWei Liu 24510c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 24520c4356baSChristian Schoenebeck dent = e->dent; 24531a6ed33cSAntonios Motakis 24541a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 24550c4356baSChristian Schoenebeck st = e->st; 24560c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 24570c4356baSChristian Schoenebeck if (!st) { 24580c4356baSChristian Schoenebeck err = -1; 24590c4356baSChristian Schoenebeck break; 24600c4356baSChristian Schoenebeck } 24610c4356baSChristian Schoenebeck 24620c4356baSChristian Schoenebeck /* remap inode */ 24630c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 24641a6ed33cSAntonios Motakis if (err < 0) { 24650c4356baSChristian Schoenebeck break; 24661a6ed33cSAntonios Motakis } 24671a6ed33cSAntonios Motakis } else { 246860ce86c7SWei Liu /* 246960ce86c7SWei Liu * Fill up just the path field of qid because the client uses 247060ce86c7SWei Liu * only that. To fill the entire qid structure we will have 24711a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 24720c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 24731a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 24741a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 24751a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 24761a6ed33cSAntonios Motakis * files/dirs through other ways. 247760ce86c7SWei Liu */ 247860ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 247960ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 248060ce86c7SWei Liu /* Fill the other fields with dummy values */ 248160ce86c7SWei Liu qid.type = 0; 248260ce86c7SWei Liu qid.version = 0; 24831a6ed33cSAntonios Motakis } 248460ce86c7SWei Liu 2485*6b3b279bSKeno Fischer off = qemu_dirent_off(dent); 24860c4356baSChristian Schoenebeck v9fs_string_init(&name); 24870c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24880c4356baSChristian Schoenebeck 248960ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 249060ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 2491*6b3b279bSKeno Fischer &qid, off, 249260ce86c7SWei Liu dent->d_type, &name); 24937cde47d4SGreg Kurz 24940c4356baSChristian Schoenebeck v9fs_string_free(&name); 24957cde47d4SGreg Kurz 249660ce86c7SWei Liu if (len < 0) { 24970c4356baSChristian Schoenebeck err = len; 24980c4356baSChristian Schoenebeck break; 249960ce86c7SWei Liu } 25000c4356baSChristian Schoenebeck 250160ce86c7SWei Liu count += len; 250260ce86c7SWei Liu } 25037cde47d4SGreg Kurz 25040c4356baSChristian Schoenebeck out: 25050c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 250660ce86c7SWei Liu if (err < 0) { 250760ce86c7SWei Liu return err; 250860ce86c7SWei Liu } 250960ce86c7SWei Liu return count; 251060ce86c7SWei Liu } 251160ce86c7SWei Liu 25128440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 251360ce86c7SWei Liu { 251460ce86c7SWei Liu int32_t fid; 251560ce86c7SWei Liu V9fsFidState *fidp; 251660ce86c7SWei Liu ssize_t retval = 0; 251760ce86c7SWei Liu size_t offset = 7; 251860ce86c7SWei Liu uint64_t initial_offset; 251960ce86c7SWei Liu int32_t count; 252060ce86c7SWei Liu uint32_t max_count; 252160ce86c7SWei Liu V9fsPDU *pdu = opaque; 2522d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 252360ce86c7SWei Liu 252460ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 252560ce86c7SWei Liu &initial_offset, &max_count); 252660ce86c7SWei Liu if (retval < 0) { 252760ce86c7SWei Liu goto out_nofid; 252860ce86c7SWei Liu } 252960ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 253060ce86c7SWei Liu 2531d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2532d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2533d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2534d36a5c22SChristian Schoenebeck warn_report_once( 2535d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2536d36a5c22SChristian Schoenebeck ); 2537d36a5c22SChristian Schoenebeck } 2538d36a5c22SChristian Schoenebeck 253960ce86c7SWei Liu fidp = get_fid(pdu, fid); 254060ce86c7SWei Liu if (fidp == NULL) { 254160ce86c7SWei Liu retval = -EINVAL; 254260ce86c7SWei Liu goto out_nofid; 254360ce86c7SWei Liu } 2544f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 254560ce86c7SWei Liu retval = -EINVAL; 254660ce86c7SWei Liu goto out; 254760ce86c7SWei Liu } 2548d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2549d2c5cf7cSChristian Schoenebeck warn_report_once( 2550d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2551d2c5cf7cSChristian Schoenebeck "protocol version" 2552d2c5cf7cSChristian Schoenebeck ); 2553d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2554d2c5cf7cSChristian Schoenebeck goto out; 2555d2c5cf7cSChristian Schoenebeck } 25560c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 255760ce86c7SWei Liu if (count < 0) { 255860ce86c7SWei Liu retval = count; 255960ce86c7SWei Liu goto out; 256060ce86c7SWei Liu } 256160ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 256260ce86c7SWei Liu if (retval < 0) { 256360ce86c7SWei Liu goto out; 256460ce86c7SWei Liu } 256560ce86c7SWei Liu retval += count + offset; 256660ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 256760ce86c7SWei Liu out: 256860ce86c7SWei Liu put_fid(pdu, fidp); 256960ce86c7SWei Liu out_nofid: 257060ce86c7SWei Liu pdu_complete(pdu, retval); 257160ce86c7SWei Liu } 257260ce86c7SWei Liu 257360ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 257460ce86c7SWei Liu uint64_t off, uint32_t count, 257560ce86c7SWei Liu struct iovec *sg, int cnt) 257660ce86c7SWei Liu { 257760ce86c7SWei Liu int i, to_copy; 257860ce86c7SWei Liu ssize_t err = 0; 25797e55d65cSLi Qiang uint64_t write_count; 258060ce86c7SWei Liu size_t offset = 7; 258160ce86c7SWei Liu 258260ce86c7SWei Liu 25837e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2584b858e80aSDaniel Henrique Barboza return -ENOSPC; 258560ce86c7SWei Liu } 25867e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 25877e55d65cSLi Qiang if (write_count > count) { 25887e55d65cSLi Qiang write_count = count; 25897e55d65cSLi Qiang } 259060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 259160ce86c7SWei Liu if (err < 0) { 259260ce86c7SWei Liu return err; 259360ce86c7SWei Liu } 259460ce86c7SWei Liu err += offset; 259560ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 259660ce86c7SWei Liu /* 259760ce86c7SWei Liu * Now copy the content from sg list 259860ce86c7SWei Liu */ 259960ce86c7SWei Liu for (i = 0; i < cnt; i++) { 260060ce86c7SWei Liu if (write_count > sg[i].iov_len) { 260160ce86c7SWei Liu to_copy = sg[i].iov_len; 260260ce86c7SWei Liu } else { 260360ce86c7SWei Liu to_copy = write_count; 260460ce86c7SWei Liu } 260560ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 260660ce86c7SWei Liu /* updating vs->off since we are not using below */ 260760ce86c7SWei Liu off += to_copy; 260860ce86c7SWei Liu write_count -= to_copy; 260960ce86c7SWei Liu } 2610b858e80aSDaniel Henrique Barboza 261160ce86c7SWei Liu return err; 261260ce86c7SWei Liu } 261360ce86c7SWei Liu 26148440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 261560ce86c7SWei Liu { 261660ce86c7SWei Liu ssize_t err; 261760ce86c7SWei Liu int32_t fid; 261860ce86c7SWei Liu uint64_t off; 261960ce86c7SWei Liu uint32_t count; 262060ce86c7SWei Liu int32_t len = 0; 262160ce86c7SWei Liu int32_t total = 0; 262260ce86c7SWei Liu size_t offset = 7; 262360ce86c7SWei Liu V9fsFidState *fidp; 262460ce86c7SWei Liu V9fsPDU *pdu = opaque; 262560ce86c7SWei Liu V9fsState *s = pdu->s; 262660ce86c7SWei Liu QEMUIOVector qiov_full; 262760ce86c7SWei Liu QEMUIOVector qiov; 262860ce86c7SWei Liu 262960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 263060ce86c7SWei Liu if (err < 0) { 263160ce86c7SWei Liu pdu_complete(pdu, err); 263260ce86c7SWei Liu return; 263360ce86c7SWei Liu } 263460ce86c7SWei Liu offset += err; 2635cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 263660ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 263760ce86c7SWei Liu 263860ce86c7SWei Liu fidp = get_fid(pdu, fid); 263960ce86c7SWei Liu if (fidp == NULL) { 264060ce86c7SWei Liu err = -EINVAL; 264160ce86c7SWei Liu goto out_nofid; 264260ce86c7SWei Liu } 264360ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 264460ce86c7SWei Liu if (fidp->fs.fd == -1) { 264560ce86c7SWei Liu err = -EINVAL; 264660ce86c7SWei Liu goto out; 264760ce86c7SWei Liu } 264860ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 264960ce86c7SWei Liu /* 265060ce86c7SWei Liu * setxattr operation 265160ce86c7SWei Liu */ 265260ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 265360ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 265460ce86c7SWei Liu goto out; 265560ce86c7SWei Liu } else { 265660ce86c7SWei Liu err = -EINVAL; 265760ce86c7SWei Liu goto out; 265860ce86c7SWei Liu } 265960ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 266060ce86c7SWei Liu do { 266160ce86c7SWei Liu qemu_iovec_reset(&qiov); 266260ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 266360ce86c7SWei Liu if (0) { 266460ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 266560ce86c7SWei Liu } 266660ce86c7SWei Liu /* Loop in case of EINTR */ 266760ce86c7SWei Liu do { 266860ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 266960ce86c7SWei Liu if (len >= 0) { 267060ce86c7SWei Liu off += len; 267160ce86c7SWei Liu total += len; 267260ce86c7SWei Liu } 267360ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 267460ce86c7SWei Liu if (len < 0) { 267560ce86c7SWei Liu /* IO error return the error */ 267660ce86c7SWei Liu err = len; 267760ce86c7SWei Liu goto out_qiov; 267860ce86c7SWei Liu } 267960ce86c7SWei Liu } while (total < count && len > 0); 268060ce86c7SWei Liu 268160ce86c7SWei Liu offset = 7; 268260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 268360ce86c7SWei Liu if (err < 0) { 2684fdfcc9aeSLi Qiang goto out_qiov; 268560ce86c7SWei Liu } 268660ce86c7SWei Liu err += offset; 268760ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 268860ce86c7SWei Liu out_qiov: 268960ce86c7SWei Liu qemu_iovec_destroy(&qiov); 269060ce86c7SWei Liu out: 269160ce86c7SWei Liu put_fid(pdu, fidp); 269260ce86c7SWei Liu out_nofid: 269360ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 269460ce86c7SWei Liu pdu_complete(pdu, err); 269560ce86c7SWei Liu } 269660ce86c7SWei Liu 26978440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 269860ce86c7SWei Liu { 269960ce86c7SWei Liu int32_t fid; 270060ce86c7SWei Liu int err = 0; 270160ce86c7SWei Liu size_t offset = 7; 270260ce86c7SWei Liu V9fsFidState *fidp; 270360ce86c7SWei Liu V9fsQID qid; 270460ce86c7SWei Liu int32_t perm; 270560ce86c7SWei Liu int8_t mode; 270660ce86c7SWei Liu V9fsPath path; 270760ce86c7SWei Liu struct stat stbuf; 270860ce86c7SWei Liu V9fsString name; 270960ce86c7SWei Liu V9fsString extension; 271060ce86c7SWei Liu int iounit; 271160ce86c7SWei Liu V9fsPDU *pdu = opaque; 27125b3c77aaSGreg Kurz V9fsState *s = pdu->s; 271360ce86c7SWei Liu 271460ce86c7SWei Liu v9fs_path_init(&path); 271560ce86c7SWei Liu v9fs_string_init(&name); 271660ce86c7SWei Liu v9fs_string_init(&extension); 271760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 271860ce86c7SWei Liu &perm, &mode, &extension); 271960ce86c7SWei Liu if (err < 0) { 272060ce86c7SWei Liu goto out_nofid; 272160ce86c7SWei Liu } 272260ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 272360ce86c7SWei Liu 2724fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2725fff39a7aSGreg Kurz err = -ENOENT; 2726fff39a7aSGreg Kurz goto out_nofid; 2727fff39a7aSGreg Kurz } 2728fff39a7aSGreg Kurz 2729805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2730805b5d98SGreg Kurz err = -EEXIST; 2731805b5d98SGreg Kurz goto out_nofid; 2732805b5d98SGreg Kurz } 2733805b5d98SGreg Kurz 273460ce86c7SWei Liu fidp = get_fid(pdu, fid); 273560ce86c7SWei Liu if (fidp == NULL) { 273660ce86c7SWei Liu err = -EINVAL; 273760ce86c7SWei Liu goto out_nofid; 273860ce86c7SWei Liu } 2739d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2740d63fb193SLi Qiang err = -EINVAL; 2741d63fb193SLi Qiang goto out; 2742d63fb193SLi Qiang } 274360ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 274460ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 274560ce86c7SWei Liu fidp->uid, -1, &stbuf); 274660ce86c7SWei Liu if (err < 0) { 274760ce86c7SWei Liu goto out; 274860ce86c7SWei Liu } 274960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 275060ce86c7SWei Liu if (err < 0) { 275160ce86c7SWei Liu goto out; 275260ce86c7SWei Liu } 27535b3c77aaSGreg Kurz v9fs_path_write_lock(s); 275460ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27555b3c77aaSGreg Kurz v9fs_path_unlock(s); 275660ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 275760ce86c7SWei Liu if (err < 0) { 275860ce86c7SWei Liu goto out; 275960ce86c7SWei Liu } 276060ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 276160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 276260ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 276360ce86c7SWei Liu extension.data, -1 , &stbuf); 276460ce86c7SWei Liu if (err < 0) { 276560ce86c7SWei Liu goto out; 276660ce86c7SWei Liu } 276760ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 276860ce86c7SWei Liu if (err < 0) { 276960ce86c7SWei Liu goto out; 277060ce86c7SWei Liu } 27715b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27735b3c77aaSGreg Kurz v9fs_path_unlock(s); 277460ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 277560ce86c7SWei Liu int32_t ofid = atoi(extension.data); 277660ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 277760ce86c7SWei Liu if (ofidp == NULL) { 277860ce86c7SWei Liu err = -EINVAL; 277960ce86c7SWei Liu goto out; 278060ce86c7SWei Liu } 278160ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 278260ce86c7SWei Liu put_fid(pdu, ofidp); 278360ce86c7SWei Liu if (err < 0) { 278460ce86c7SWei Liu goto out; 278560ce86c7SWei Liu } 278660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 278760ce86c7SWei Liu if (err < 0) { 278860ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 278960ce86c7SWei Liu goto out; 279060ce86c7SWei Liu } 27915b3c77aaSGreg Kurz v9fs_path_write_lock(s); 279260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27935b3c77aaSGreg Kurz v9fs_path_unlock(s); 279460ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 279560ce86c7SWei Liu if (err < 0) { 279660ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 279760ce86c7SWei Liu goto out; 279860ce86c7SWei Liu } 279960ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 280060ce86c7SWei Liu char ctype; 280160ce86c7SWei Liu uint32_t major, minor; 280260ce86c7SWei Liu mode_t nmode = 0; 280360ce86c7SWei Liu 280460ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 280560ce86c7SWei Liu err = -errno; 280660ce86c7SWei Liu goto out; 280760ce86c7SWei Liu } 280860ce86c7SWei Liu 280960ce86c7SWei Liu switch (ctype) { 281060ce86c7SWei Liu case 'c': 281160ce86c7SWei Liu nmode = S_IFCHR; 281260ce86c7SWei Liu break; 281360ce86c7SWei Liu case 'b': 281460ce86c7SWei Liu nmode = S_IFBLK; 281560ce86c7SWei Liu break; 281660ce86c7SWei Liu default: 281760ce86c7SWei Liu err = -EIO; 281860ce86c7SWei Liu goto out; 281960ce86c7SWei Liu } 282060ce86c7SWei Liu 282160ce86c7SWei Liu nmode |= perm & 0777; 282260ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 282360ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 282460ce86c7SWei Liu if (err < 0) { 282560ce86c7SWei Liu goto out; 282660ce86c7SWei Liu } 282760ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 282860ce86c7SWei Liu if (err < 0) { 282960ce86c7SWei Liu goto out; 283060ce86c7SWei Liu } 28315b3c77aaSGreg Kurz v9fs_path_write_lock(s); 283260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28335b3c77aaSGreg Kurz v9fs_path_unlock(s); 283460ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 283560ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 283660ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 283760ce86c7SWei Liu if (err < 0) { 283860ce86c7SWei Liu goto out; 283960ce86c7SWei Liu } 284060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 284160ce86c7SWei Liu if (err < 0) { 284260ce86c7SWei Liu goto out; 284360ce86c7SWei Liu } 28445b3c77aaSGreg Kurz v9fs_path_write_lock(s); 284560ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28465b3c77aaSGreg Kurz v9fs_path_unlock(s); 284760ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 284860ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 284960ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 285060ce86c7SWei Liu if (err < 0) { 285160ce86c7SWei Liu goto out; 285260ce86c7SWei Liu } 285360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 285460ce86c7SWei Liu if (err < 0) { 285560ce86c7SWei Liu goto out; 285660ce86c7SWei Liu } 28575b3c77aaSGreg Kurz v9fs_path_write_lock(s); 285860ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28595b3c77aaSGreg Kurz v9fs_path_unlock(s); 286060ce86c7SWei Liu } else { 286160ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 286260ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 286360ce86c7SWei Liu if (err < 0) { 286460ce86c7SWei Liu goto out; 286560ce86c7SWei Liu } 286660ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 286760ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 286860ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 286960ce86c7SWei Liu /* 287060ce86c7SWei Liu * We let the host file system do O_EXCL check 287160ce86c7SWei Liu * We should not reclaim such fd 287260ce86c7SWei Liu */ 287360ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 287460ce86c7SWei Liu } 287560ce86c7SWei Liu } 287660ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 28773b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28783b5ee9e8SAntonios Motakis if (err < 0) { 28793b5ee9e8SAntonios Motakis goto out; 28803b5ee9e8SAntonios Motakis } 288160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 288260ce86c7SWei Liu if (err < 0) { 288360ce86c7SWei Liu goto out; 288460ce86c7SWei Liu } 288560ce86c7SWei Liu err += offset; 288660ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 288760ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 288860ce86c7SWei Liu out: 288960ce86c7SWei Liu put_fid(pdu, fidp); 289060ce86c7SWei Liu out_nofid: 289160ce86c7SWei Liu pdu_complete(pdu, err); 289260ce86c7SWei Liu v9fs_string_free(&name); 289360ce86c7SWei Liu v9fs_string_free(&extension); 289460ce86c7SWei Liu v9fs_path_free(&path); 289560ce86c7SWei Liu } 289660ce86c7SWei Liu 28978440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 289860ce86c7SWei Liu { 289960ce86c7SWei Liu V9fsPDU *pdu = opaque; 290060ce86c7SWei Liu V9fsString name; 290160ce86c7SWei Liu V9fsString symname; 290260ce86c7SWei Liu V9fsFidState *dfidp; 290360ce86c7SWei Liu V9fsQID qid; 290460ce86c7SWei Liu struct stat stbuf; 290560ce86c7SWei Liu int32_t dfid; 290660ce86c7SWei Liu int err = 0; 290760ce86c7SWei Liu gid_t gid; 290860ce86c7SWei Liu size_t offset = 7; 290960ce86c7SWei Liu 291060ce86c7SWei Liu v9fs_string_init(&name); 291160ce86c7SWei Liu v9fs_string_init(&symname); 291260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 291360ce86c7SWei Liu if (err < 0) { 291460ce86c7SWei Liu goto out_nofid; 291560ce86c7SWei Liu } 291660ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 291760ce86c7SWei Liu 2918fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2919fff39a7aSGreg Kurz err = -ENOENT; 2920fff39a7aSGreg Kurz goto out_nofid; 2921fff39a7aSGreg Kurz } 2922fff39a7aSGreg Kurz 2923805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2924805b5d98SGreg Kurz err = -EEXIST; 2925805b5d98SGreg Kurz goto out_nofid; 2926805b5d98SGreg Kurz } 2927805b5d98SGreg Kurz 292860ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 292960ce86c7SWei Liu if (dfidp == NULL) { 293060ce86c7SWei Liu err = -EINVAL; 293160ce86c7SWei Liu goto out_nofid; 293260ce86c7SWei Liu } 293360ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 293460ce86c7SWei Liu if (err < 0) { 293560ce86c7SWei Liu goto out; 293660ce86c7SWei Liu } 29373b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 29383b5ee9e8SAntonios Motakis if (err < 0) { 29393b5ee9e8SAntonios Motakis goto out; 29403b5ee9e8SAntonios Motakis } 294160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 294260ce86c7SWei Liu if (err < 0) { 294360ce86c7SWei Liu goto out; 294460ce86c7SWei Liu } 294560ce86c7SWei Liu err += offset; 294660ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 294760ce86c7SWei Liu qid.type, qid.version, qid.path); 294860ce86c7SWei Liu out: 294960ce86c7SWei Liu put_fid(pdu, dfidp); 295060ce86c7SWei Liu out_nofid: 295160ce86c7SWei Liu pdu_complete(pdu, err); 295260ce86c7SWei Liu v9fs_string_free(&name); 295360ce86c7SWei Liu v9fs_string_free(&symname); 295460ce86c7SWei Liu } 295560ce86c7SWei Liu 2956a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 295760ce86c7SWei Liu { 295860ce86c7SWei Liu ssize_t err; 295960ce86c7SWei Liu int16_t tag; 296060ce86c7SWei Liu size_t offset = 7; 2961d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 296260ce86c7SWei Liu V9fsPDU *pdu = opaque; 296360ce86c7SWei Liu V9fsState *s = pdu->s; 296460ce86c7SWei Liu 296560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 296660ce86c7SWei Liu if (err < 0) { 296760ce86c7SWei Liu pdu_complete(pdu, err); 296860ce86c7SWei Liu return; 296960ce86c7SWei Liu } 297060ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 297160ce86c7SWei Liu 2972d5f2af7bSGreg Kurz if (pdu->tag == tag) { 29733dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2974d5f2af7bSGreg Kurz } else { 297560ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 297660ce86c7SWei Liu if (cancel_pdu->tag == tag) { 297760ce86c7SWei Liu break; 297860ce86c7SWei Liu } 297960ce86c7SWei Liu } 2980d5f2af7bSGreg Kurz } 298160ce86c7SWei Liu if (cancel_pdu) { 298260ce86c7SWei Liu cancel_pdu->cancelled = 1; 298360ce86c7SWei Liu /* 298460ce86c7SWei Liu * Wait for pdu to complete. 298560ce86c7SWei Liu */ 29861ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 298718adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 298860ce86c7SWei Liu cancel_pdu->cancelled = 0; 298960ce86c7SWei Liu pdu_free(cancel_pdu); 299060ce86c7SWei Liu } 299118adde86SGreg Kurz } 299260ce86c7SWei Liu pdu_complete(pdu, 7); 299360ce86c7SWei Liu } 299460ce86c7SWei Liu 29958440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 299660ce86c7SWei Liu { 299760ce86c7SWei Liu V9fsPDU *pdu = opaque; 299860ce86c7SWei Liu int32_t dfid, oldfid; 299960ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 300060ce86c7SWei Liu V9fsString name; 300160ce86c7SWei Liu size_t offset = 7; 300260ce86c7SWei Liu int err = 0; 300360ce86c7SWei Liu 300460ce86c7SWei Liu v9fs_string_init(&name); 300560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 300660ce86c7SWei Liu if (err < 0) { 300760ce86c7SWei Liu goto out_nofid; 300860ce86c7SWei Liu } 300960ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 301060ce86c7SWei Liu 3011fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3012fff39a7aSGreg Kurz err = -ENOENT; 3013fff39a7aSGreg Kurz goto out_nofid; 3014fff39a7aSGreg Kurz } 3015fff39a7aSGreg Kurz 3016805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3017805b5d98SGreg Kurz err = -EEXIST; 3018805b5d98SGreg Kurz goto out_nofid; 3019805b5d98SGreg Kurz } 3020805b5d98SGreg Kurz 302160ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 302260ce86c7SWei Liu if (dfidp == NULL) { 302360ce86c7SWei Liu err = -ENOENT; 302460ce86c7SWei Liu goto out_nofid; 302560ce86c7SWei Liu } 302660ce86c7SWei Liu 302760ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 302860ce86c7SWei Liu if (oldfidp == NULL) { 302960ce86c7SWei Liu err = -ENOENT; 303060ce86c7SWei Liu goto out; 303160ce86c7SWei Liu } 303260ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 303360ce86c7SWei Liu if (!err) { 303460ce86c7SWei Liu err = offset; 303560ce86c7SWei Liu } 30364c158678SLi Qiang put_fid(pdu, oldfidp); 303760ce86c7SWei Liu out: 303860ce86c7SWei Liu put_fid(pdu, dfidp); 303960ce86c7SWei Liu out_nofid: 304060ce86c7SWei Liu v9fs_string_free(&name); 304160ce86c7SWei Liu pdu_complete(pdu, err); 304260ce86c7SWei Liu } 304360ce86c7SWei Liu 304460ce86c7SWei Liu /* Only works with path name based fid */ 30458440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 304660ce86c7SWei Liu { 304760ce86c7SWei Liu int32_t fid; 304860ce86c7SWei Liu int err = 0; 304960ce86c7SWei Liu size_t offset = 7; 305060ce86c7SWei Liu V9fsFidState *fidp; 305160ce86c7SWei Liu V9fsPDU *pdu = opaque; 305260ce86c7SWei Liu 305360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 305460ce86c7SWei Liu if (err < 0) { 305560ce86c7SWei Liu goto out_nofid; 305660ce86c7SWei Liu } 305760ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 305860ce86c7SWei Liu 305960ce86c7SWei Liu fidp = get_fid(pdu, fid); 306060ce86c7SWei Liu if (fidp == NULL) { 306160ce86c7SWei Liu err = -EINVAL; 306260ce86c7SWei Liu goto out_nofid; 306360ce86c7SWei Liu } 306460ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 306560ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 306660ce86c7SWei Liu err = -EOPNOTSUPP; 306760ce86c7SWei Liu goto out_err; 306860ce86c7SWei Liu } 306960ce86c7SWei Liu /* 307060ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 307160ce86c7SWei Liu * the file later. So don't reclaim fd 307260ce86c7SWei Liu */ 307360ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 307460ce86c7SWei Liu if (err < 0) { 307560ce86c7SWei Liu goto out_err; 307660ce86c7SWei Liu } 307760ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 307860ce86c7SWei Liu if (!err) { 307960ce86c7SWei Liu err = offset; 308060ce86c7SWei Liu } 308160ce86c7SWei Liu out_err: 308260ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 308360ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 308460ce86c7SWei Liu put_fid(pdu, fidp); 308560ce86c7SWei Liu out_nofid: 308660ce86c7SWei Liu pdu_complete(pdu, err); 308760ce86c7SWei Liu } 308860ce86c7SWei Liu 30898440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 309060ce86c7SWei Liu { 309160ce86c7SWei Liu int err = 0; 309260ce86c7SWei Liu V9fsString name; 309367e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 309460ce86c7SWei Liu size_t offset = 7; 309560ce86c7SWei Liu V9fsPath path; 309660ce86c7SWei Liu V9fsFidState *dfidp; 309760ce86c7SWei Liu V9fsPDU *pdu = opaque; 309860ce86c7SWei Liu 309960ce86c7SWei Liu v9fs_string_init(&name); 310060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 310160ce86c7SWei Liu if (err < 0) { 310260ce86c7SWei Liu goto out_nofid; 310360ce86c7SWei Liu } 3104fff39a7aSGreg Kurz 3105fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3106fff39a7aSGreg Kurz err = -ENOENT; 3107fff39a7aSGreg Kurz goto out_nofid; 3108fff39a7aSGreg Kurz } 3109fff39a7aSGreg Kurz 3110805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3111805b5d98SGreg Kurz err = -EINVAL; 3112805b5d98SGreg Kurz goto out_nofid; 3113805b5d98SGreg Kurz } 3114805b5d98SGreg Kurz 3115805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3116805b5d98SGreg Kurz err = -ENOTEMPTY; 3117805b5d98SGreg Kurz goto out_nofid; 3118805b5d98SGreg Kurz } 3119805b5d98SGreg Kurz 312067e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 312167e87345SKeno Fischer err = -EINVAL; 312267e87345SKeno Fischer goto out_nofid; 312367e87345SKeno Fischer } 312467e87345SKeno Fischer 312567e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 312667e87345SKeno Fischer rflags |= AT_REMOVEDIR; 312767e87345SKeno Fischer } 312867e87345SKeno Fischer 312960ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 313060ce86c7SWei Liu if (dfidp == NULL) { 313160ce86c7SWei Liu err = -EINVAL; 313260ce86c7SWei Liu goto out_nofid; 313360ce86c7SWei Liu } 313460ce86c7SWei Liu /* 313560ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 313660ce86c7SWei Liu * the file later. So don't reclaim fd 313760ce86c7SWei Liu */ 313860ce86c7SWei Liu v9fs_path_init(&path); 313960ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 314060ce86c7SWei Liu if (err < 0) { 314160ce86c7SWei Liu goto out_err; 314260ce86c7SWei Liu } 314360ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 314460ce86c7SWei Liu if (err < 0) { 314560ce86c7SWei Liu goto out_err; 314660ce86c7SWei Liu } 314767e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 314860ce86c7SWei Liu if (!err) { 314960ce86c7SWei Liu err = offset; 315060ce86c7SWei Liu } 315160ce86c7SWei Liu out_err: 315260ce86c7SWei Liu put_fid(pdu, dfidp); 315360ce86c7SWei Liu v9fs_path_free(&path); 315460ce86c7SWei Liu out_nofid: 315560ce86c7SWei Liu pdu_complete(pdu, err); 315660ce86c7SWei Liu v9fs_string_free(&name); 315760ce86c7SWei Liu } 315860ce86c7SWei Liu 315960ce86c7SWei Liu 316060ce86c7SWei Liu /* Only works with path name based fid */ 31618440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 31628440e22eSGreg Kurz int32_t newdirfid, 31638440e22eSGreg Kurz V9fsString *name) 316460ce86c7SWei Liu { 316560ce86c7SWei Liu int err = 0; 316660ce86c7SWei Liu V9fsPath new_path; 316760ce86c7SWei Liu V9fsFidState *tfidp; 316860ce86c7SWei Liu V9fsState *s = pdu->s; 316960ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 317060ce86c7SWei Liu 317160ce86c7SWei Liu v9fs_path_init(&new_path); 317260ce86c7SWei Liu if (newdirfid != -1) { 317360ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 317460ce86c7SWei Liu if (dirfidp == NULL) { 3175b858e80aSDaniel Henrique Barboza return -ENOENT; 317660ce86c7SWei Liu } 317749dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 317849dd946bSGreg Kurz err = -EINVAL; 317949dd946bSGreg Kurz goto out; 318049dd946bSGreg Kurz } 31814fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 31824fa62005SGreg Kurz if (err < 0) { 31834fa62005SGreg Kurz goto out; 31844fa62005SGreg Kurz } 318560ce86c7SWei Liu } else { 31864d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31874d8bc733SJan Dakinevich V9fsPath dir_path; 31884d8bc733SJan Dakinevich 31894d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31904d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31914d8bc733SJan Dakinevich g_free(dir_name); 31924d8bc733SJan Dakinevich 31934d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31944d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31954fa62005SGreg Kurz if (err < 0) { 31964fa62005SGreg Kurz goto out; 31974fa62005SGreg Kurz } 319860ce86c7SWei Liu } 319960ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 320060ce86c7SWei Liu if (err < 0) { 320160ce86c7SWei Liu goto out; 320260ce86c7SWei Liu } 320360ce86c7SWei Liu /* 320460ce86c7SWei Liu * Fixup fid's pointing to the old name to 320560ce86c7SWei Liu * start pointing to the new name 320660ce86c7SWei Liu */ 3207feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 320860ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 320960ce86c7SWei Liu /* replace the name */ 321060ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 321160ce86c7SWei Liu } 321260ce86c7SWei Liu } 321360ce86c7SWei Liu out: 321460ce86c7SWei Liu if (dirfidp) { 321560ce86c7SWei Liu put_fid(pdu, dirfidp); 321660ce86c7SWei Liu } 321760ce86c7SWei Liu v9fs_path_free(&new_path); 321860ce86c7SWei Liu return err; 321960ce86c7SWei Liu } 322060ce86c7SWei Liu 322160ce86c7SWei Liu /* Only works with path name based fid */ 32228440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 322360ce86c7SWei Liu { 322460ce86c7SWei Liu int32_t fid; 322560ce86c7SWei Liu ssize_t err = 0; 322660ce86c7SWei Liu size_t offset = 7; 322760ce86c7SWei Liu V9fsString name; 322860ce86c7SWei Liu int32_t newdirfid; 322960ce86c7SWei Liu V9fsFidState *fidp; 323060ce86c7SWei Liu V9fsPDU *pdu = opaque; 323160ce86c7SWei Liu V9fsState *s = pdu->s; 323260ce86c7SWei Liu 323360ce86c7SWei Liu v9fs_string_init(&name); 323460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 323560ce86c7SWei Liu if (err < 0) { 323660ce86c7SWei Liu goto out_nofid; 323760ce86c7SWei Liu } 3238fff39a7aSGreg Kurz 3239fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3240fff39a7aSGreg Kurz err = -ENOENT; 3241fff39a7aSGreg Kurz goto out_nofid; 3242fff39a7aSGreg Kurz } 3243fff39a7aSGreg Kurz 3244805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3245805b5d98SGreg Kurz err = -EISDIR; 3246805b5d98SGreg Kurz goto out_nofid; 3247805b5d98SGreg Kurz } 3248805b5d98SGreg Kurz 324960ce86c7SWei Liu fidp = get_fid(pdu, fid); 325060ce86c7SWei Liu if (fidp == NULL) { 325160ce86c7SWei Liu err = -ENOENT; 325260ce86c7SWei Liu goto out_nofid; 325360ce86c7SWei Liu } 325449dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 325549dd946bSGreg Kurz err = -EINVAL; 325649dd946bSGreg Kurz goto out; 325749dd946bSGreg Kurz } 325860ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 325960ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 326060ce86c7SWei Liu err = -EOPNOTSUPP; 326160ce86c7SWei Liu goto out; 326260ce86c7SWei Liu } 326360ce86c7SWei Liu v9fs_path_write_lock(s); 326460ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 326560ce86c7SWei Liu v9fs_path_unlock(s); 326660ce86c7SWei Liu if (!err) { 326760ce86c7SWei Liu err = offset; 326860ce86c7SWei Liu } 326960ce86c7SWei Liu out: 327060ce86c7SWei Liu put_fid(pdu, fidp); 327160ce86c7SWei Liu out_nofid: 327260ce86c7SWei Liu pdu_complete(pdu, err); 327360ce86c7SWei Liu v9fs_string_free(&name); 327460ce86c7SWei Liu } 327560ce86c7SWei Liu 32764fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 32778440e22eSGreg Kurz V9fsString *old_name, 32788440e22eSGreg Kurz V9fsPath *newdir, 327960ce86c7SWei Liu V9fsString *new_name) 328060ce86c7SWei Liu { 328160ce86c7SWei Liu V9fsFidState *tfidp; 328260ce86c7SWei Liu V9fsPath oldpath, newpath; 328360ce86c7SWei Liu V9fsState *s = pdu->s; 32844fa62005SGreg Kurz int err; 328560ce86c7SWei Liu 328660ce86c7SWei Liu v9fs_path_init(&oldpath); 328760ce86c7SWei Liu v9fs_path_init(&newpath); 32884fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32894fa62005SGreg Kurz if (err < 0) { 32904fa62005SGreg Kurz goto out; 32914fa62005SGreg Kurz } 32924fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32934fa62005SGreg Kurz if (err < 0) { 32944fa62005SGreg Kurz goto out; 32954fa62005SGreg Kurz } 329660ce86c7SWei Liu 329760ce86c7SWei Liu /* 329860ce86c7SWei Liu * Fixup fid's pointing to the old name to 329960ce86c7SWei Liu * start pointing to the new name 330060ce86c7SWei Liu */ 3301feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 330260ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 330360ce86c7SWei Liu /* replace the name */ 330460ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 330560ce86c7SWei Liu } 330660ce86c7SWei Liu } 33074fa62005SGreg Kurz out: 330860ce86c7SWei Liu v9fs_path_free(&oldpath); 330960ce86c7SWei Liu v9fs_path_free(&newpath); 33104fa62005SGreg Kurz return err; 331160ce86c7SWei Liu } 331260ce86c7SWei Liu 33138440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 33148440e22eSGreg Kurz V9fsString *old_name, 33158440e22eSGreg Kurz int32_t newdirfid, 331660ce86c7SWei Liu V9fsString *new_name) 331760ce86c7SWei Liu { 331860ce86c7SWei Liu int err = 0; 331960ce86c7SWei Liu V9fsState *s = pdu->s; 332060ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 332160ce86c7SWei Liu 332260ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 332360ce86c7SWei Liu if (olddirfidp == NULL) { 332460ce86c7SWei Liu err = -ENOENT; 332560ce86c7SWei Liu goto out; 332660ce86c7SWei Liu } 332760ce86c7SWei Liu if (newdirfid != -1) { 332860ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 332960ce86c7SWei Liu if (newdirfidp == NULL) { 333060ce86c7SWei Liu err = -ENOENT; 333160ce86c7SWei Liu goto out; 333260ce86c7SWei Liu } 333360ce86c7SWei Liu } else { 333460ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 333560ce86c7SWei Liu } 333660ce86c7SWei Liu 333760ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 333860ce86c7SWei Liu &newdirfidp->path, new_name); 333960ce86c7SWei Liu if (err < 0) { 334060ce86c7SWei Liu goto out; 334160ce86c7SWei Liu } 334260ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 334360ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 33444fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 334560ce86c7SWei Liu &newdirfidp->path, new_name); 334660ce86c7SWei Liu } 334760ce86c7SWei Liu out: 334860ce86c7SWei Liu if (olddirfidp) { 334960ce86c7SWei Liu put_fid(pdu, olddirfidp); 335060ce86c7SWei Liu } 335160ce86c7SWei Liu if (newdirfidp) { 335260ce86c7SWei Liu put_fid(pdu, newdirfidp); 335360ce86c7SWei Liu } 335460ce86c7SWei Liu return err; 335560ce86c7SWei Liu } 335660ce86c7SWei Liu 33578440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 335860ce86c7SWei Liu { 335960ce86c7SWei Liu ssize_t err = 0; 336060ce86c7SWei Liu size_t offset = 7; 336160ce86c7SWei Liu V9fsPDU *pdu = opaque; 336260ce86c7SWei Liu V9fsState *s = pdu->s; 336360ce86c7SWei Liu int32_t olddirfid, newdirfid; 336460ce86c7SWei Liu V9fsString old_name, new_name; 336560ce86c7SWei Liu 336660ce86c7SWei Liu v9fs_string_init(&old_name); 336760ce86c7SWei Liu v9fs_string_init(&new_name); 336860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 336960ce86c7SWei Liu &old_name, &newdirfid, &new_name); 337060ce86c7SWei Liu if (err < 0) { 337160ce86c7SWei Liu goto out_err; 337260ce86c7SWei Liu } 337360ce86c7SWei Liu 3374fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3375fff39a7aSGreg Kurz err = -ENOENT; 3376fff39a7aSGreg Kurz goto out_err; 3377fff39a7aSGreg Kurz } 3378fff39a7aSGreg Kurz 3379805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3380805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3381805b5d98SGreg Kurz err = -EISDIR; 3382805b5d98SGreg Kurz goto out_err; 3383805b5d98SGreg Kurz } 3384805b5d98SGreg Kurz 338560ce86c7SWei Liu v9fs_path_write_lock(s); 338660ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 338760ce86c7SWei Liu &old_name, newdirfid, &new_name); 338860ce86c7SWei Liu v9fs_path_unlock(s); 338960ce86c7SWei Liu if (!err) { 339060ce86c7SWei Liu err = offset; 339160ce86c7SWei Liu } 339260ce86c7SWei Liu 339360ce86c7SWei Liu out_err: 339460ce86c7SWei Liu pdu_complete(pdu, err); 339560ce86c7SWei Liu v9fs_string_free(&old_name); 339660ce86c7SWei Liu v9fs_string_free(&new_name); 339760ce86c7SWei Liu } 339860ce86c7SWei Liu 33998440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 340060ce86c7SWei Liu { 340160ce86c7SWei Liu int32_t fid; 340260ce86c7SWei Liu int err = 0; 340360ce86c7SWei Liu int16_t unused; 340460ce86c7SWei Liu V9fsStat v9stat; 340560ce86c7SWei Liu size_t offset = 7; 340660ce86c7SWei Liu struct stat stbuf; 340760ce86c7SWei Liu V9fsFidState *fidp; 340860ce86c7SWei Liu V9fsPDU *pdu = opaque; 34091d203986SGreg Kurz V9fsState *s = pdu->s; 341060ce86c7SWei Liu 341160ce86c7SWei Liu v9fs_stat_init(&v9stat); 341260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 341360ce86c7SWei Liu if (err < 0) { 341460ce86c7SWei Liu goto out_nofid; 341560ce86c7SWei Liu } 341660ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 341760ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 341860ce86c7SWei Liu 341960ce86c7SWei Liu fidp = get_fid(pdu, fid); 342060ce86c7SWei Liu if (fidp == NULL) { 342160ce86c7SWei Liu err = -EINVAL; 342260ce86c7SWei Liu goto out_nofid; 342360ce86c7SWei Liu } 342460ce86c7SWei Liu /* do we need to sync the file? */ 342560ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 342660ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 342760ce86c7SWei Liu goto out; 342860ce86c7SWei Liu } 342960ce86c7SWei Liu if (v9stat.mode != -1) { 343060ce86c7SWei Liu uint32_t v9_mode; 343160ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 343260ce86c7SWei Liu if (err < 0) { 343360ce86c7SWei Liu goto out; 343460ce86c7SWei Liu } 343560ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 343660ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 343760ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 343860ce86c7SWei Liu /* Attempting to change the type */ 343960ce86c7SWei Liu err = -EIO; 344060ce86c7SWei Liu goto out; 344160ce86c7SWei Liu } 344260ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 344360ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 344460ce86c7SWei Liu &v9stat.extension)); 344560ce86c7SWei Liu if (err < 0) { 344660ce86c7SWei Liu goto out; 344760ce86c7SWei Liu } 344860ce86c7SWei Liu } 344960ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 345060ce86c7SWei Liu struct timespec times[2]; 345160ce86c7SWei Liu if (v9stat.atime != -1) { 345260ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 345360ce86c7SWei Liu times[0].tv_nsec = 0; 345460ce86c7SWei Liu } else { 345560ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 345660ce86c7SWei Liu } 345760ce86c7SWei Liu if (v9stat.mtime != -1) { 345860ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 345960ce86c7SWei Liu times[1].tv_nsec = 0; 346060ce86c7SWei Liu } else { 346160ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 346260ce86c7SWei Liu } 346360ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 346460ce86c7SWei Liu if (err < 0) { 346560ce86c7SWei Liu goto out; 346660ce86c7SWei Liu } 346760ce86c7SWei Liu } 346860ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 346960ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 347060ce86c7SWei Liu if (err < 0) { 347160ce86c7SWei Liu goto out; 347260ce86c7SWei Liu } 347360ce86c7SWei Liu } 347460ce86c7SWei Liu if (v9stat.name.size != 0) { 34751d203986SGreg Kurz v9fs_path_write_lock(s); 347660ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 34771d203986SGreg Kurz v9fs_path_unlock(s); 347860ce86c7SWei Liu if (err < 0) { 347960ce86c7SWei Liu goto out; 348060ce86c7SWei Liu } 348160ce86c7SWei Liu } 348260ce86c7SWei Liu if (v9stat.length != -1) { 348360ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 348460ce86c7SWei Liu if (err < 0) { 348560ce86c7SWei Liu goto out; 348660ce86c7SWei Liu } 348760ce86c7SWei Liu } 348860ce86c7SWei Liu err = offset; 348960ce86c7SWei Liu out: 349060ce86c7SWei Liu put_fid(pdu, fidp); 349160ce86c7SWei Liu out_nofid: 349260ce86c7SWei Liu v9fs_stat_free(&v9stat); 349360ce86c7SWei Liu pdu_complete(pdu, err); 349460ce86c7SWei Liu } 349560ce86c7SWei Liu 349660ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 349760ce86c7SWei Liu { 349860ce86c7SWei Liu uint32_t f_type; 349960ce86c7SWei Liu uint32_t f_bsize; 350060ce86c7SWei Liu uint64_t f_blocks; 350160ce86c7SWei Liu uint64_t f_bfree; 350260ce86c7SWei Liu uint64_t f_bavail; 350360ce86c7SWei Liu uint64_t f_files; 350460ce86c7SWei Liu uint64_t f_ffree; 350560ce86c7SWei Liu uint64_t fsid_val; 350660ce86c7SWei Liu uint32_t f_namelen; 350760ce86c7SWei Liu size_t offset = 7; 350860ce86c7SWei Liu int32_t bsize_factor; 350960ce86c7SWei Liu 351060ce86c7SWei Liu /* 351160ce86c7SWei Liu * compute bsize factor based on host file system block size 351260ce86c7SWei Liu * and client msize 351360ce86c7SWei Liu */ 351460ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 351560ce86c7SWei Liu if (!bsize_factor) { 351660ce86c7SWei Liu bsize_factor = 1; 351760ce86c7SWei Liu } 351860ce86c7SWei Liu f_type = stbuf->f_type; 351960ce86c7SWei Liu f_bsize = stbuf->f_bsize; 352060ce86c7SWei Liu f_bsize *= bsize_factor; 352160ce86c7SWei Liu /* 352260ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 352360ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 352460ce86c7SWei Liu * blocks by bsize factor 352560ce86c7SWei Liu */ 352660ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 352760ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 352860ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 352960ce86c7SWei Liu f_files = stbuf->f_files; 353060ce86c7SWei Liu f_ffree = stbuf->f_ffree; 3531f41db099SKeno Fischer #ifdef CONFIG_DARWIN 3532f41db099SKeno Fischer fsid_val = (unsigned int)stbuf->f_fsid.val[0] | 3533f41db099SKeno Fischer (unsigned long long)stbuf->f_fsid.val[1] << 32; 3534f41db099SKeno Fischer f_namelen = NAME_MAX; 3535f41db099SKeno Fischer #else 353660ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 353760ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 353860ce86c7SWei Liu f_namelen = stbuf->f_namelen; 3539f41db099SKeno Fischer #endif 354060ce86c7SWei Liu 354160ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 354260ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 354360ce86c7SWei Liu f_bavail, f_files, f_ffree, 354460ce86c7SWei Liu fsid_val, f_namelen); 354560ce86c7SWei Liu } 354660ce86c7SWei Liu 35478440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 354860ce86c7SWei Liu { 354960ce86c7SWei Liu int32_t fid; 355060ce86c7SWei Liu ssize_t retval = 0; 355160ce86c7SWei Liu size_t offset = 7; 355260ce86c7SWei Liu V9fsFidState *fidp; 355360ce86c7SWei Liu struct statfs stbuf; 355460ce86c7SWei Liu V9fsPDU *pdu = opaque; 355560ce86c7SWei Liu V9fsState *s = pdu->s; 355660ce86c7SWei Liu 355760ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 355860ce86c7SWei Liu if (retval < 0) { 355960ce86c7SWei Liu goto out_nofid; 356060ce86c7SWei Liu } 356160ce86c7SWei Liu fidp = get_fid(pdu, fid); 356260ce86c7SWei Liu if (fidp == NULL) { 356360ce86c7SWei Liu retval = -ENOENT; 356460ce86c7SWei Liu goto out_nofid; 356560ce86c7SWei Liu } 356660ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 356760ce86c7SWei Liu if (retval < 0) { 356860ce86c7SWei Liu goto out; 356960ce86c7SWei Liu } 357060ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 357160ce86c7SWei Liu if (retval < 0) { 357260ce86c7SWei Liu goto out; 357360ce86c7SWei Liu } 357460ce86c7SWei Liu retval += offset; 357560ce86c7SWei Liu out: 357660ce86c7SWei Liu put_fid(pdu, fidp); 357760ce86c7SWei Liu out_nofid: 357860ce86c7SWei Liu pdu_complete(pdu, retval); 357960ce86c7SWei Liu } 358060ce86c7SWei Liu 35818440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 358260ce86c7SWei Liu { 358360ce86c7SWei Liu 358460ce86c7SWei Liu int mode; 358560ce86c7SWei Liu gid_t gid; 358660ce86c7SWei Liu int32_t fid; 358760ce86c7SWei Liu V9fsQID qid; 358860ce86c7SWei Liu int err = 0; 358960ce86c7SWei Liu int major, minor; 359060ce86c7SWei Liu size_t offset = 7; 359160ce86c7SWei Liu V9fsString name; 359260ce86c7SWei Liu struct stat stbuf; 359360ce86c7SWei Liu V9fsFidState *fidp; 359460ce86c7SWei Liu V9fsPDU *pdu = opaque; 359560ce86c7SWei Liu 359660ce86c7SWei Liu v9fs_string_init(&name); 359760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 359860ce86c7SWei Liu &major, &minor, &gid); 359960ce86c7SWei Liu if (err < 0) { 360060ce86c7SWei Liu goto out_nofid; 360160ce86c7SWei Liu } 360260ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 360360ce86c7SWei Liu 3604fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3605fff39a7aSGreg Kurz err = -ENOENT; 3606fff39a7aSGreg Kurz goto out_nofid; 3607fff39a7aSGreg Kurz } 3608fff39a7aSGreg Kurz 3609805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3610805b5d98SGreg Kurz err = -EEXIST; 3611805b5d98SGreg Kurz goto out_nofid; 3612805b5d98SGreg Kurz } 3613805b5d98SGreg Kurz 361460ce86c7SWei Liu fidp = get_fid(pdu, fid); 361560ce86c7SWei Liu if (fidp == NULL) { 361660ce86c7SWei Liu err = -ENOENT; 361760ce86c7SWei Liu goto out_nofid; 361860ce86c7SWei Liu } 361960ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 362060ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 362160ce86c7SWei Liu if (err < 0) { 362260ce86c7SWei Liu goto out; 362360ce86c7SWei Liu } 36243b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36253b5ee9e8SAntonios Motakis if (err < 0) { 36263b5ee9e8SAntonios Motakis goto out; 36273b5ee9e8SAntonios Motakis } 362860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 362960ce86c7SWei Liu if (err < 0) { 363060ce86c7SWei Liu goto out; 363160ce86c7SWei Liu } 363260ce86c7SWei Liu err += offset; 363360ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 363460ce86c7SWei Liu qid.type, qid.version, qid.path); 363560ce86c7SWei Liu out: 363660ce86c7SWei Liu put_fid(pdu, fidp); 363760ce86c7SWei Liu out_nofid: 363860ce86c7SWei Liu pdu_complete(pdu, err); 363960ce86c7SWei Liu v9fs_string_free(&name); 364060ce86c7SWei Liu } 364160ce86c7SWei Liu 364260ce86c7SWei Liu /* 364360ce86c7SWei Liu * Implement posix byte range locking code 364460ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 364560ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 364660ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 364760ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 364860ce86c7SWei Liu * So when a TLOCK request comes, always return success 364960ce86c7SWei Liu */ 36508440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 365160ce86c7SWei Liu { 365260ce86c7SWei Liu V9fsFlock flock; 365360ce86c7SWei Liu size_t offset = 7; 365460ce86c7SWei Liu struct stat stbuf; 365560ce86c7SWei Liu V9fsFidState *fidp; 365660ce86c7SWei Liu int32_t fid, err = 0; 365760ce86c7SWei Liu V9fsPDU *pdu = opaque; 365860ce86c7SWei Liu 365960ce86c7SWei Liu v9fs_string_init(&flock.client_id); 366060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 366160ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 366260ce86c7SWei Liu &flock.proc_id, &flock.client_id); 366360ce86c7SWei Liu if (err < 0) { 366460ce86c7SWei Liu goto out_nofid; 366560ce86c7SWei Liu } 366660ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 366760ce86c7SWei Liu flock.type, flock.start, flock.length); 366860ce86c7SWei Liu 366960ce86c7SWei Liu 367060ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 367160ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 367260ce86c7SWei Liu err = -EINVAL; 367360ce86c7SWei Liu goto out_nofid; 367460ce86c7SWei Liu } 367560ce86c7SWei Liu fidp = get_fid(pdu, fid); 367660ce86c7SWei Liu if (fidp == NULL) { 367760ce86c7SWei Liu err = -ENOENT; 367860ce86c7SWei Liu goto out_nofid; 367960ce86c7SWei Liu } 368060ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 368160ce86c7SWei Liu if (err < 0) { 368260ce86c7SWei Liu goto out; 368360ce86c7SWei Liu } 36844bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 36854bae2b39SPaolo Bonzini if (err < 0) { 36864bae2b39SPaolo Bonzini goto out; 36874bae2b39SPaolo Bonzini } 36884bae2b39SPaolo Bonzini err += offset; 36894bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 369060ce86c7SWei Liu out: 369160ce86c7SWei Liu put_fid(pdu, fidp); 369260ce86c7SWei Liu out_nofid: 369360ce86c7SWei Liu pdu_complete(pdu, err); 369460ce86c7SWei Liu v9fs_string_free(&flock.client_id); 369560ce86c7SWei Liu } 369660ce86c7SWei Liu 369760ce86c7SWei Liu /* 369860ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 369960ce86c7SWei Liu * handling is done by client's VFS layer. 370060ce86c7SWei Liu */ 37018440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 370260ce86c7SWei Liu { 370360ce86c7SWei Liu size_t offset = 7; 370460ce86c7SWei Liu struct stat stbuf; 370560ce86c7SWei Liu V9fsFidState *fidp; 370660ce86c7SWei Liu V9fsGetlock glock; 370760ce86c7SWei Liu int32_t fid, err = 0; 370860ce86c7SWei Liu V9fsPDU *pdu = opaque; 370960ce86c7SWei Liu 371060ce86c7SWei Liu v9fs_string_init(&glock.client_id); 371160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 371260ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 371360ce86c7SWei Liu &glock.client_id); 371460ce86c7SWei Liu if (err < 0) { 371560ce86c7SWei Liu goto out_nofid; 371660ce86c7SWei Liu } 371760ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 371860ce86c7SWei Liu glock.type, glock.start, glock.length); 371960ce86c7SWei Liu 372060ce86c7SWei Liu fidp = get_fid(pdu, fid); 372160ce86c7SWei Liu if (fidp == NULL) { 372260ce86c7SWei Liu err = -ENOENT; 372360ce86c7SWei Liu goto out_nofid; 372460ce86c7SWei Liu } 372560ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 372660ce86c7SWei Liu if (err < 0) { 372760ce86c7SWei Liu goto out; 372860ce86c7SWei Liu } 372960ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 373060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 373160ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 373260ce86c7SWei Liu &glock.client_id); 373360ce86c7SWei Liu if (err < 0) { 373460ce86c7SWei Liu goto out; 373560ce86c7SWei Liu } 373660ce86c7SWei Liu err += offset; 373760ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 373860ce86c7SWei Liu glock.length, glock.proc_id); 373960ce86c7SWei Liu out: 374060ce86c7SWei Liu put_fid(pdu, fidp); 374160ce86c7SWei Liu out_nofid: 374260ce86c7SWei Liu pdu_complete(pdu, err); 374360ce86c7SWei Liu v9fs_string_free(&glock.client_id); 374460ce86c7SWei Liu } 374560ce86c7SWei Liu 37468440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 374760ce86c7SWei Liu { 374860ce86c7SWei Liu V9fsPDU *pdu = opaque; 374960ce86c7SWei Liu size_t offset = 7; 375060ce86c7SWei Liu int32_t fid; 375160ce86c7SWei Liu struct stat stbuf; 375260ce86c7SWei Liu V9fsQID qid; 375360ce86c7SWei Liu V9fsString name; 375460ce86c7SWei Liu V9fsFidState *fidp; 375560ce86c7SWei Liu gid_t gid; 375660ce86c7SWei Liu int mode; 375760ce86c7SWei Liu int err = 0; 375860ce86c7SWei Liu 375960ce86c7SWei Liu v9fs_string_init(&name); 376060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 376160ce86c7SWei Liu if (err < 0) { 376260ce86c7SWei Liu goto out_nofid; 376360ce86c7SWei Liu } 376460ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 376560ce86c7SWei Liu 3766fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3767fff39a7aSGreg Kurz err = -ENOENT; 3768fff39a7aSGreg Kurz goto out_nofid; 3769fff39a7aSGreg Kurz } 3770fff39a7aSGreg Kurz 3771805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3772805b5d98SGreg Kurz err = -EEXIST; 3773805b5d98SGreg Kurz goto out_nofid; 3774805b5d98SGreg Kurz } 3775805b5d98SGreg Kurz 377660ce86c7SWei Liu fidp = get_fid(pdu, fid); 377760ce86c7SWei Liu if (fidp == NULL) { 377860ce86c7SWei Liu err = -ENOENT; 377960ce86c7SWei Liu goto out_nofid; 378060ce86c7SWei Liu } 378160ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 378260ce86c7SWei Liu if (err < 0) { 378360ce86c7SWei Liu goto out; 378460ce86c7SWei Liu } 37853b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 37863b5ee9e8SAntonios Motakis if (err < 0) { 37873b5ee9e8SAntonios Motakis goto out; 37883b5ee9e8SAntonios Motakis } 378960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 379060ce86c7SWei Liu if (err < 0) { 379160ce86c7SWei Liu goto out; 379260ce86c7SWei Liu } 379360ce86c7SWei Liu err += offset; 379460ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 379560ce86c7SWei Liu qid.type, qid.version, qid.path, err); 379660ce86c7SWei Liu out: 379760ce86c7SWei Liu put_fid(pdu, fidp); 379860ce86c7SWei Liu out_nofid: 379960ce86c7SWei Liu pdu_complete(pdu, err); 380060ce86c7SWei Liu v9fs_string_free(&name); 380160ce86c7SWei Liu } 380260ce86c7SWei Liu 38038440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 380460ce86c7SWei Liu { 380560ce86c7SWei Liu int64_t size; 380660ce86c7SWei Liu V9fsString name; 380760ce86c7SWei Liu ssize_t err = 0; 380860ce86c7SWei Liu size_t offset = 7; 380960ce86c7SWei Liu int32_t fid, newfid; 381060ce86c7SWei Liu V9fsFidState *file_fidp; 381160ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 381260ce86c7SWei Liu V9fsPDU *pdu = opaque; 381360ce86c7SWei Liu V9fsState *s = pdu->s; 381460ce86c7SWei Liu 381560ce86c7SWei Liu v9fs_string_init(&name); 381660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 381760ce86c7SWei Liu if (err < 0) { 381860ce86c7SWei Liu goto out_nofid; 381960ce86c7SWei Liu } 382060ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 382160ce86c7SWei Liu 382260ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 382360ce86c7SWei Liu if (file_fidp == NULL) { 382460ce86c7SWei Liu err = -ENOENT; 382560ce86c7SWei Liu goto out_nofid; 382660ce86c7SWei Liu } 382760ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 382860ce86c7SWei Liu if (xattr_fidp == NULL) { 382960ce86c7SWei Liu err = -EINVAL; 383060ce86c7SWei Liu goto out; 383160ce86c7SWei Liu } 383260ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3833ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 383460ce86c7SWei Liu /* 383560ce86c7SWei Liu * listxattr request. Get the size first 383660ce86c7SWei Liu */ 383760ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 383860ce86c7SWei Liu if (size < 0) { 383960ce86c7SWei Liu err = size; 384060ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 384160ce86c7SWei Liu goto out; 384260ce86c7SWei Liu } 384360ce86c7SWei Liu /* 384460ce86c7SWei Liu * Read the xattr value 384560ce86c7SWei Liu */ 384660ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 384760ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3848dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38497bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3850a647502cSKeno Fischer if (size) { 385160ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 385260ce86c7SWei Liu xattr_fidp->fs.xattr.value, 385360ce86c7SWei Liu xattr_fidp->fs.xattr.len); 385460ce86c7SWei Liu if (err < 0) { 385560ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 385660ce86c7SWei Liu goto out; 385760ce86c7SWei Liu } 385860ce86c7SWei Liu } 385960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 386060ce86c7SWei Liu if (err < 0) { 386160ce86c7SWei Liu goto out; 386260ce86c7SWei Liu } 386360ce86c7SWei Liu err += offset; 386460ce86c7SWei Liu } else { 386560ce86c7SWei Liu /* 386660ce86c7SWei Liu * specific xattr fid. We check for xattr 386760ce86c7SWei Liu * presence also collect the xattr size 386860ce86c7SWei Liu */ 386960ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 387060ce86c7SWei Liu &name, NULL, 0); 387160ce86c7SWei Liu if (size < 0) { 387260ce86c7SWei Liu err = size; 387360ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 387460ce86c7SWei Liu goto out; 387560ce86c7SWei Liu } 387660ce86c7SWei Liu /* 387760ce86c7SWei Liu * Read the xattr value 387860ce86c7SWei Liu */ 387960ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 388060ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3881dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38827bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3883a647502cSKeno Fischer if (size) { 388460ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 388560ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 388660ce86c7SWei Liu xattr_fidp->fs.xattr.len); 388760ce86c7SWei Liu if (err < 0) { 388860ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 388960ce86c7SWei Liu goto out; 389060ce86c7SWei Liu } 389160ce86c7SWei Liu } 389260ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 389360ce86c7SWei Liu if (err < 0) { 389460ce86c7SWei Liu goto out; 389560ce86c7SWei Liu } 389660ce86c7SWei Liu err += offset; 389760ce86c7SWei Liu } 389860ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 389960ce86c7SWei Liu out: 390060ce86c7SWei Liu put_fid(pdu, file_fidp); 390160ce86c7SWei Liu if (xattr_fidp) { 390260ce86c7SWei Liu put_fid(pdu, xattr_fidp); 390360ce86c7SWei Liu } 390460ce86c7SWei Liu out_nofid: 390560ce86c7SWei Liu pdu_complete(pdu, err); 390660ce86c7SWei Liu v9fs_string_free(&name); 390760ce86c7SWei Liu } 390860ce86c7SWei Liu 39098440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 391060ce86c7SWei Liu { 3911aca6897fSKeno Fischer int flags, rflags = 0; 391260ce86c7SWei Liu int32_t fid; 39133b79ef2cSGreg Kurz uint64_t size; 391460ce86c7SWei Liu ssize_t err = 0; 391560ce86c7SWei Liu V9fsString name; 391660ce86c7SWei Liu size_t offset = 7; 391760ce86c7SWei Liu V9fsFidState *file_fidp; 391860ce86c7SWei Liu V9fsFidState *xattr_fidp; 391960ce86c7SWei Liu V9fsPDU *pdu = opaque; 392060ce86c7SWei Liu 392160ce86c7SWei Liu v9fs_string_init(&name); 392260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 392360ce86c7SWei Liu if (err < 0) { 392460ce86c7SWei Liu goto out_nofid; 392560ce86c7SWei Liu } 392660ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 392760ce86c7SWei Liu 3928aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3929aca6897fSKeno Fischer err = -EINVAL; 3930aca6897fSKeno Fischer goto out_nofid; 3931aca6897fSKeno Fischer } 3932aca6897fSKeno Fischer 3933aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3934aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3935aca6897fSKeno Fischer } 3936aca6897fSKeno Fischer 3937aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3938aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3939aca6897fSKeno Fischer } 3940aca6897fSKeno Fischer 39413b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 39423b79ef2cSGreg Kurz err = -E2BIG; 39433b79ef2cSGreg Kurz goto out_nofid; 39443b79ef2cSGreg Kurz } 39453b79ef2cSGreg Kurz 394660ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 394760ce86c7SWei Liu if (file_fidp == NULL) { 394860ce86c7SWei Liu err = -EINVAL; 394960ce86c7SWei Liu goto out_nofid; 395060ce86c7SWei Liu } 3951dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3952dd654e03SGreg Kurz err = -EINVAL; 3953dd654e03SGreg Kurz goto out_put_fid; 3954dd654e03SGreg Kurz } 3955dd654e03SGreg Kurz 395660ce86c7SWei Liu /* Make the file fid point to xattr */ 395760ce86c7SWei Liu xattr_fidp = file_fidp; 395860ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 395960ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3960dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 396160ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3962aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 396360ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 396460ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3965eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 396660ce86c7SWei Liu err = offset; 3967dd654e03SGreg Kurz out_put_fid: 396860ce86c7SWei Liu put_fid(pdu, file_fidp); 396960ce86c7SWei Liu out_nofid: 397060ce86c7SWei Liu pdu_complete(pdu, err); 397160ce86c7SWei Liu v9fs_string_free(&name); 397260ce86c7SWei Liu } 397360ce86c7SWei Liu 39748440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 397560ce86c7SWei Liu { 397660ce86c7SWei Liu V9fsPDU *pdu = opaque; 397760ce86c7SWei Liu size_t offset = 7; 397860ce86c7SWei Liu V9fsString target; 397960ce86c7SWei Liu int32_t fid; 398060ce86c7SWei Liu int err = 0; 398160ce86c7SWei Liu V9fsFidState *fidp; 398260ce86c7SWei Liu 398360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 398460ce86c7SWei Liu if (err < 0) { 398560ce86c7SWei Liu goto out_nofid; 398660ce86c7SWei Liu } 398760ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 398860ce86c7SWei Liu fidp = get_fid(pdu, fid); 398960ce86c7SWei Liu if (fidp == NULL) { 399060ce86c7SWei Liu err = -ENOENT; 399160ce86c7SWei Liu goto out_nofid; 399260ce86c7SWei Liu } 399360ce86c7SWei Liu 399460ce86c7SWei Liu v9fs_string_init(&target); 399560ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 399660ce86c7SWei Liu if (err < 0) { 399760ce86c7SWei Liu goto out; 399860ce86c7SWei Liu } 399960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 400060ce86c7SWei Liu if (err < 0) { 400160ce86c7SWei Liu v9fs_string_free(&target); 400260ce86c7SWei Liu goto out; 400360ce86c7SWei Liu } 400460ce86c7SWei Liu err += offset; 400560ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 400660ce86c7SWei Liu v9fs_string_free(&target); 400760ce86c7SWei Liu out: 400860ce86c7SWei Liu put_fid(pdu, fidp); 400960ce86c7SWei Liu out_nofid: 401060ce86c7SWei Liu pdu_complete(pdu, err); 401160ce86c7SWei Liu } 401260ce86c7SWei Liu 401360ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 401460ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 401560ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 401660ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 401760ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 401860ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 401960ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 402060ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 402160ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 402260ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 402360ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 402460ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 402560ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 402660ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 402760ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 402860ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 402960ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 403060ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 403160ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 403260ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 403360ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 403460ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 403560ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 403660ce86c7SWei Liu [P9_TREAD] = v9fs_read, 403760ce86c7SWei Liu #if 0 403860ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 403960ce86c7SWei Liu #endif 404060ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 404160ce86c7SWei Liu [P9_TLINK] = v9fs_link, 404260ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 404360ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 404460ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 404560ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 404660ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 404760ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 404860ce86c7SWei Liu }; 404960ce86c7SWei Liu 40508440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 405160ce86c7SWei Liu { 405260ce86c7SWei Liu V9fsPDU *pdu = opaque; 405360ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 405460ce86c7SWei Liu } 405560ce86c7SWei Liu 40568440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 405760ce86c7SWei Liu { 405860ce86c7SWei Liu V9fsPDU *pdu = opaque; 405960ce86c7SWei Liu pdu_complete(pdu, -EROFS); 406060ce86c7SWei Liu } 406160ce86c7SWei Liu 406260ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 406360ce86c7SWei Liu { 406460ce86c7SWei Liu switch (pdu->id) { 406560ce86c7SWei Liu case P9_TREADDIR: 406660ce86c7SWei Liu case P9_TSTATFS: 406760ce86c7SWei Liu case P9_TGETATTR: 406860ce86c7SWei Liu case P9_TXATTRWALK: 406960ce86c7SWei Liu case P9_TLOCK: 407060ce86c7SWei Liu case P9_TGETLOCK: 407160ce86c7SWei Liu case P9_TREADLINK: 407260ce86c7SWei Liu case P9_TVERSION: 407360ce86c7SWei Liu case P9_TLOPEN: 407460ce86c7SWei Liu case P9_TATTACH: 407560ce86c7SWei Liu case P9_TSTAT: 407660ce86c7SWei Liu case P9_TWALK: 407760ce86c7SWei Liu case P9_TCLUNK: 407860ce86c7SWei Liu case P9_TFSYNC: 407960ce86c7SWei Liu case P9_TOPEN: 408060ce86c7SWei Liu case P9_TREAD: 408160ce86c7SWei Liu case P9_TAUTH: 408260ce86c7SWei Liu case P9_TFLUSH: 408360ce86c7SWei Liu return 1; 408460ce86c7SWei Liu default: 408560ce86c7SWei Liu return 0; 408660ce86c7SWei Liu } 408760ce86c7SWei Liu } 408860ce86c7SWei Liu 4089506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 409060ce86c7SWei Liu { 409160ce86c7SWei Liu Coroutine *co; 409260ce86c7SWei Liu CoroutineEntry *handler; 409360ce86c7SWei Liu V9fsState *s = pdu->s; 409460ce86c7SWei Liu 4095506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4096506f3275SGreg Kurz pdu->id = hdr->id; 4097506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4098506f3275SGreg Kurz 409960ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 410060ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 410160ce86c7SWei Liu handler = v9fs_op_not_supp; 4102d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4103d1471233SGreg Kurz handler = v9fs_fs_ro; 410460ce86c7SWei Liu } else { 410560ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 410660ce86c7SWei Liu } 410760ce86c7SWei Liu 4108506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 41090b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 41100b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 411160ce86c7SWei Liu } 411260ce86c7SWei Liu 41132a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4114066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4115066eb006SGreg Kurz Error **errp) 41162a0c56aaSWei Liu { 411792c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 41182a0c56aaSWei Liu int i, len; 41192a0c56aaSWei Liu struct stat stat; 41202a0c56aaSWei Liu FsDriverEntry *fse; 41212a0c56aaSWei Liu V9fsPath path; 41222a0c56aaSWei Liu int rc = 1; 41232a0c56aaSWei Liu 4124066eb006SGreg Kurz assert(!s->transport); 4125066eb006SGreg Kurz s->transport = t; 4126066eb006SGreg Kurz 41272a0c56aaSWei Liu /* initialize pdu allocator */ 41282a0c56aaSWei Liu QLIST_INIT(&s->free_list); 41292a0c56aaSWei Liu QLIST_INIT(&s->active_list); 41300d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4131583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4132583f21f8SStefano Stabellini s->pdus[i].s = s; 4133583f21f8SStefano Stabellini s->pdus[i].idx = i; 41342a0c56aaSWei Liu } 41352a0c56aaSWei Liu 41362a0c56aaSWei Liu v9fs_path_init(&path); 41372a0c56aaSWei Liu 41382a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 41392a0c56aaSWei Liu 41402a0c56aaSWei Liu if (!fse) { 41412a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 41422a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 41432a0c56aaSWei Liu "id = %s", 41442a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 41452a0c56aaSWei Liu goto out; 41462a0c56aaSWei Liu } 41472a0c56aaSWei Liu 41482a0c56aaSWei Liu if (!s->fsconf.tag) { 41492a0c56aaSWei Liu /* we haven't specified a mount_tag */ 41502a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 41512a0c56aaSWei Liu s->fsconf.fsdev_id); 41522a0c56aaSWei Liu goto out; 41532a0c56aaSWei Liu } 41542a0c56aaSWei Liu 41552a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 41562a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 41572a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 41582a0c56aaSWei Liu len = strlen(s->fsconf.tag); 41592a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 41602a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 41612a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 41622a0c56aaSWei Liu goto out; 41632a0c56aaSWei Liu } 41642a0c56aaSWei Liu 41652a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 41662a0c56aaSWei Liu s->ctx.uid = -1; 41672a0c56aaSWei Liu 41682a0c56aaSWei Liu s->ops = fse->ops; 41692a0c56aaSWei Liu 4170b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4171b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4172b96feb2cSTobias Schramm 4173feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 41742a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 41752a0c56aaSWei Liu 417665603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 417765603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 417865603a80SGreg Kurz s->fsconf.fsdev_id); 41792a0c56aaSWei Liu goto out; 41802a0c56aaSWei Liu } 41812a0c56aaSWei Liu 41822a0c56aaSWei Liu /* 41832a0c56aaSWei Liu * Check details of export path, We need to use fs driver 41842a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 41852a0c56aaSWei Liu * use co-routines here. 41862a0c56aaSWei Liu */ 41872a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 41882a0c56aaSWei Liu error_setg(errp, 41892a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 41902a0c56aaSWei Liu goto out; 41912a0c56aaSWei Liu } 41922a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41932a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41942a0c56aaSWei Liu goto out; 41952a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41962a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41972a0c56aaSWei Liu goto out; 41982a0c56aaSWei Liu } 4199b8bbdb88SPradeep Jagadeesh 42003b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 42013b5ee9e8SAntonios Motakis 42026b6aa828SChristian Schoenebeck /* init inode remapping : */ 42036b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 42046b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 42056b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 42066b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 42076b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 42081a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 42096b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 42106b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4211f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 42121a6ed33cSAntonios Motakis 4213b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4214b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4215b8bbdb88SPradeep Jagadeesh 42162a0c56aaSWei Liu rc = 0; 42172a0c56aaSWei Liu out: 42182a0c56aaSWei Liu if (rc) { 4219b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4220702dbcc2SLi Qiang } 42212a0c56aaSWei Liu v9fs_path_free(&path); 42222a0c56aaSWei Liu return rc; 42232a0c56aaSWei Liu } 42242a0c56aaSWei Liu 4225b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 42262a0c56aaSWei Liu { 4227c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4228702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4229702dbcc2SLi Qiang } 4230c0da0cb7SGreg Kurz if (s->ctx.fst) { 4231b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4232c0da0cb7SGreg Kurz } 42332a0c56aaSWei Liu g_free(s->tag); 42346b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4235f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4236f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 42374774718eSLi Qiang g_free(s->ctx.fs_root); 42382a0c56aaSWei Liu } 42392a0c56aaSWei Liu 42400e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 42410e44a0fdSGreg Kurz V9fsPDU pdu; 42420e44a0fdSGreg Kurz bool done; 42430e44a0fdSGreg Kurz } VirtfsCoResetData; 42440e44a0fdSGreg Kurz 42450e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 42460e44a0fdSGreg Kurz { 42470e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 42480e44a0fdSGreg Kurz 42490e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 42500e44a0fdSGreg Kurz data->done = true; 42510e44a0fdSGreg Kurz } 42520e44a0fdSGreg Kurz 42530e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 42540e44a0fdSGreg Kurz { 42550e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 42560e44a0fdSGreg Kurz Coroutine *co; 42570e44a0fdSGreg Kurz 42580e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 42590e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42600e44a0fdSGreg Kurz } 42610e44a0fdSGreg Kurz 42620e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 42630e44a0fdSGreg Kurz qemu_coroutine_enter(co); 42640e44a0fdSGreg Kurz 42650e44a0fdSGreg Kurz while (!data.done) { 42660e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42670e44a0fdSGreg Kurz } 42680e44a0fdSGreg Kurz } 42690e44a0fdSGreg Kurz 427060ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 427160ce86c7SWei Liu { 427260ce86c7SWei Liu struct rlimit rlim; 427360ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 427463325b18SGreg Kurz error_report("Failed to get the resource limit"); 427560ce86c7SWei Liu exit(1); 427660ce86c7SWei Liu } 427760ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 427860ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 427960ce86c7SWei Liu } 4280