160ce86c7SWei Liu /* 260ce86c7SWei Liu * Virtio 9p backend 360ce86c7SWei Liu * 460ce86c7SWei Liu * Copyright IBM, Corp. 2010 560ce86c7SWei Liu * 660ce86c7SWei Liu * Authors: 760ce86c7SWei Liu * Anthony Liguori <aliguori@us.ibm.com> 860ce86c7SWei Liu * 960ce86c7SWei Liu * This work is licensed under the terms of the GNU GPL, version 2. See 1060ce86c7SWei Liu * the COPYING file in the top-level directory. 1160ce86c7SWei Liu * 1260ce86c7SWei Liu */ 1360ce86c7SWei Liu 146f569084SChristian Schoenebeck /* 156f569084SChristian Schoenebeck * Not so fast! You might want to read the 9p developer docs first: 166f569084SChristian Schoenebeck * https://wiki.qemu.org/Documentation/9p 176f569084SChristian Schoenebeck */ 186f569084SChristian Schoenebeck 19fbc04127SPeter Maydell #include "qemu/osdep.h" 20e3e83f2eSGreg Kurz #include <glib/gprintf.h> 2160ce86c7SWei Liu #include "hw/virtio/virtio.h" 22da34e65cSMarkus Armbruster #include "qapi/error.h" 2360ce86c7SWei Liu #include "qemu/error-report.h" 2460ce86c7SWei Liu #include "qemu/iov.h" 25db725815SMarkus Armbruster #include "qemu/main-loop.h" 2660ce86c7SWei Liu #include "qemu/sockets.h" 2760ce86c7SWei Liu #include "virtio-9p.h" 2860ce86c7SWei Liu #include "fsdev/qemu-fsdev.h" 2960ce86c7SWei Liu #include "9p-xattr.h" 3060ce86c7SWei Liu #include "coth.h" 3160ce86c7SWei Liu #include "trace.h" 32795c40b8SJuan Quintela #include "migration/blocker.h" 331a6ed33cSAntonios Motakis #include "qemu/xxhash.h" 346b6aa828SChristian Schoenebeck #include <math.h> 3503556ea9SDan Robertson #include <linux/limits.h> 3660ce86c7SWei Liu 3760ce86c7SWei Liu int open_fd_hw; 3860ce86c7SWei Liu int total_open_fd; 3960ce86c7SWei Liu static int open_fd_rc; 4060ce86c7SWei Liu 4160ce86c7SWei Liu enum { 4260ce86c7SWei Liu Oread = 0x00, 4360ce86c7SWei Liu Owrite = 0x01, 4460ce86c7SWei Liu Ordwr = 0x02, 4560ce86c7SWei Liu Oexec = 0x03, 4660ce86c7SWei Liu Oexcl = 0x04, 4760ce86c7SWei Liu Otrunc = 0x10, 4860ce86c7SWei Liu Orexec = 0x20, 4960ce86c7SWei Liu Orclose = 0x40, 5060ce86c7SWei Liu Oappend = 0x80, 5160ce86c7SWei Liu }; 5260ce86c7SWei Liu 53cc82fde9SChristian Schoenebeck P9ARRAY_DEFINE_TYPE(V9fsPath, v9fs_path_free); 54cc82fde9SChristian Schoenebeck 5575673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 5660ce86c7SWei Liu { 5760ce86c7SWei Liu ssize_t ret; 5860ce86c7SWei Liu va_list ap; 5960ce86c7SWei Liu 6060ce86c7SWei Liu va_start(ap, fmt); 61ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 6260ce86c7SWei Liu va_end(ap); 6360ce86c7SWei Liu 6460ce86c7SWei Liu return ret; 6560ce86c7SWei Liu } 6660ce86c7SWei Liu 6775673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 6860ce86c7SWei Liu { 6960ce86c7SWei Liu ssize_t ret; 7060ce86c7SWei Liu va_list ap; 7160ce86c7SWei Liu 7260ce86c7SWei Liu va_start(ap, fmt); 73ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 7460ce86c7SWei Liu va_end(ap); 7560ce86c7SWei Liu 7660ce86c7SWei Liu return ret; 7760ce86c7SWei Liu } 7860ce86c7SWei Liu 7960ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 8060ce86c7SWei Liu { 8160ce86c7SWei Liu int ret = 0; 8260ce86c7SWei Liu 8360ce86c7SWei Liu switch (mode & 3) { 8460ce86c7SWei Liu case Oread: 8560ce86c7SWei Liu ret = O_RDONLY; 8660ce86c7SWei Liu break; 8760ce86c7SWei Liu case Ordwr: 8860ce86c7SWei Liu ret = O_RDWR; 8960ce86c7SWei Liu break; 9060ce86c7SWei Liu case Owrite: 9160ce86c7SWei Liu ret = O_WRONLY; 9260ce86c7SWei Liu break; 9360ce86c7SWei Liu case Oexec: 9460ce86c7SWei Liu ret = O_RDONLY; 9560ce86c7SWei Liu break; 9660ce86c7SWei Liu } 9760ce86c7SWei Liu 9860ce86c7SWei Liu if (mode & Otrunc) { 9960ce86c7SWei Liu ret |= O_TRUNC; 10060ce86c7SWei Liu } 10160ce86c7SWei Liu 10260ce86c7SWei Liu if (mode & Oappend) { 10360ce86c7SWei Liu ret |= O_APPEND; 10460ce86c7SWei Liu } 10560ce86c7SWei Liu 10660ce86c7SWei Liu if (mode & Oexcl) { 10760ce86c7SWei Liu ret |= O_EXCL; 10860ce86c7SWei Liu } 10960ce86c7SWei Liu 11060ce86c7SWei Liu return ret; 11160ce86c7SWei Liu } 11260ce86c7SWei Liu 1138e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 11460ce86c7SWei Liu int dotl_flag; 11560ce86c7SWei Liu int open_flag; 1168e71b96cSGreg Kurz } DotlOpenflagMap; 11760ce86c7SWei Liu 11860ce86c7SWei Liu static int dotl_to_open_flags(int flags) 11960ce86c7SWei Liu { 12060ce86c7SWei Liu int i; 12160ce86c7SWei Liu /* 12260ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 12360ce86c7SWei Liu * and P9_DOTL_NOACCESS 12460ce86c7SWei Liu */ 12560ce86c7SWei Liu int oflags = flags & O_ACCMODE; 12660ce86c7SWei Liu 1278e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 12860ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 12960ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 13060ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 13160ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 13260ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 13360ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 13460ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 13560ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 13660ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 13760ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 13860ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 13960ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 14060ce86c7SWei Liu { P9_DOTL_NOATIME, O_NOATIME }, 14160ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 14260ce86c7SWei Liu }; 14360ce86c7SWei Liu 14460ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 14560ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 14660ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 14760ce86c7SWei Liu } 14860ce86c7SWei Liu } 14960ce86c7SWei Liu 15060ce86c7SWei Liu return oflags; 15160ce86c7SWei Liu } 15260ce86c7SWei Liu 15360ce86c7SWei Liu void cred_init(FsCred *credp) 15460ce86c7SWei Liu { 15560ce86c7SWei Liu credp->fc_uid = -1; 15660ce86c7SWei Liu credp->fc_gid = -1; 15760ce86c7SWei Liu credp->fc_mode = -1; 15860ce86c7SWei Liu credp->fc_rdev = -1; 15960ce86c7SWei Liu } 16060ce86c7SWei Liu 16160ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 16260ce86c7SWei Liu { 16360ce86c7SWei Liu int flags; 16460ce86c7SWei Liu /* 16560ce86c7SWei Liu * Filter the client open flags 16660ce86c7SWei Liu */ 16760ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 16860ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 16960ce86c7SWei Liu /* 17060ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 17160ce86c7SWei Liu */ 17260ce86c7SWei Liu flags &= ~O_DIRECT; 17360ce86c7SWei Liu return flags; 17460ce86c7SWei Liu } 17560ce86c7SWei Liu 17660ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 17760ce86c7SWei Liu { 17860ce86c7SWei Liu path->data = NULL; 17960ce86c7SWei Liu path->size = 0; 18060ce86c7SWei Liu } 18160ce86c7SWei Liu 18260ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 18360ce86c7SWei Liu { 18460ce86c7SWei Liu g_free(path->data); 18560ce86c7SWei Liu path->data = NULL; 18660ce86c7SWei Liu path->size = 0; 18760ce86c7SWei Liu } 18860ce86c7SWei Liu 189e3e83f2eSGreg Kurz 190e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 191e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 192e3e83f2eSGreg Kurz { 193e3e83f2eSGreg Kurz va_list ap; 194e3e83f2eSGreg Kurz 195e3e83f2eSGreg Kurz v9fs_path_free(path); 196e3e83f2eSGreg Kurz 197e3e83f2eSGreg Kurz va_start(ap, fmt); 198e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 199e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 200e3e83f2eSGreg Kurz va_end(ap); 201e3e83f2eSGreg Kurz } 202e3e83f2eSGreg Kurz 203e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 20460ce86c7SWei Liu { 205e446a1ebSMarc-André Lureau v9fs_path_free(dst); 206e446a1ebSMarc-André Lureau dst->size = src->size; 207e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 20860ce86c7SWei Liu } 20960ce86c7SWei Liu 21060ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 21160ce86c7SWei Liu const char *name, V9fsPath *path) 21260ce86c7SWei Liu { 21360ce86c7SWei Liu int err; 21460ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 21560ce86c7SWei Liu if (err < 0) { 21660ce86c7SWei Liu err = -errno; 21760ce86c7SWei Liu } 21860ce86c7SWei Liu return err; 21960ce86c7SWei Liu } 22060ce86c7SWei Liu 22160ce86c7SWei Liu /* 22260ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 22360ce86c7SWei Liu * 22460ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 22560ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 22660ce86c7SWei Liu */ 22760ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 22860ce86c7SWei Liu { 22960ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 23060ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 23160ce86c7SWei Liu return 1; 23260ce86c7SWei Liu } 23360ce86c7SWei Liu } 23460ce86c7SWei Liu return 0; 23560ce86c7SWei Liu } 23660ce86c7SWei Liu 23760ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 23860ce86c7SWei Liu { 23960ce86c7SWei Liu return str->size; 24060ce86c7SWei Liu } 24160ce86c7SWei Liu 24260ce86c7SWei Liu /* 24360ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2448440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 24560ce86c7SWei Liu { 24660ce86c7SWei Liu int err = 1; 24760ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 24860ce86c7SWei Liu if (f->fs.fd == -1) { 24960ce86c7SWei Liu do { 25060ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 25160ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25260ce86c7SWei Liu } 25360ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 254f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 25560ce86c7SWei Liu do { 25660ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 25760ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25860ce86c7SWei Liu } 25960ce86c7SWei Liu } 26060ce86c7SWei Liu return err; 26160ce86c7SWei Liu } 26260ce86c7SWei Liu 2638440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 26460ce86c7SWei Liu { 26560ce86c7SWei Liu int err; 26660ce86c7SWei Liu V9fsFidState *f; 26760ce86c7SWei Liu V9fsState *s = pdu->s; 26860ce86c7SWei Liu 269feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 27060ce86c7SWei Liu BUG_ON(f->clunked); 27160ce86c7SWei Liu if (f->fid == fid) { 27260ce86c7SWei Liu /* 27360ce86c7SWei Liu * Update the fid ref upfront so that 27460ce86c7SWei Liu * we don't get reclaimed when we yield 27560ce86c7SWei Liu * in open later. 27660ce86c7SWei Liu */ 27760ce86c7SWei Liu f->ref++; 27860ce86c7SWei Liu /* 27960ce86c7SWei Liu * check whether we need to reopen the 28060ce86c7SWei Liu * file. We might have closed the fd 28160ce86c7SWei Liu * while trying to free up some file 28260ce86c7SWei Liu * descriptors. 28360ce86c7SWei Liu */ 28460ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 28560ce86c7SWei Liu if (err < 0) { 28660ce86c7SWei Liu f->ref--; 28760ce86c7SWei Liu return NULL; 28860ce86c7SWei Liu } 28960ce86c7SWei Liu /* 29060ce86c7SWei Liu * Mark the fid as referenced so that the LRU 29160ce86c7SWei Liu * reclaim won't close the file descriptor 29260ce86c7SWei Liu */ 29360ce86c7SWei Liu f->flags |= FID_REFERENCED; 29460ce86c7SWei Liu return f; 29560ce86c7SWei Liu } 29660ce86c7SWei Liu } 29760ce86c7SWei Liu return NULL; 29860ce86c7SWei Liu } 29960ce86c7SWei Liu 30060ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 30160ce86c7SWei Liu { 30260ce86c7SWei Liu V9fsFidState *f; 30360ce86c7SWei Liu 304feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 30560ce86c7SWei Liu /* If fid is already there return NULL */ 30660ce86c7SWei Liu BUG_ON(f->clunked); 30760ce86c7SWei Liu if (f->fid == fid) { 30860ce86c7SWei Liu return NULL; 30960ce86c7SWei Liu } 31060ce86c7SWei Liu } 31160ce86c7SWei Liu f = g_malloc0(sizeof(V9fsFidState)); 31260ce86c7SWei Liu f->fid = fid; 31360ce86c7SWei Liu f->fid_type = P9_FID_NONE; 31460ce86c7SWei Liu f->ref = 1; 31560ce86c7SWei Liu /* 31660ce86c7SWei Liu * Mark the fid as referenced so that the LRU 31760ce86c7SWei Liu * reclaim won't close the file descriptor 31860ce86c7SWei Liu */ 31960ce86c7SWei Liu f->flags |= FID_REFERENCED; 32020b7f45bSGreg Kurz QSIMPLEQ_INSERT_TAIL(&s->fid_list, f, next); 32160ce86c7SWei Liu 322d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 323d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3247cde47d4SGreg Kurz 32560ce86c7SWei Liu return f; 32660ce86c7SWei Liu } 32760ce86c7SWei Liu 3288440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 32960ce86c7SWei Liu { 33060ce86c7SWei Liu int retval = 0; 33160ce86c7SWei Liu 332dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 33360ce86c7SWei Liu /* getxattr/listxattr fid */ 33460ce86c7SWei Liu goto free_value; 33560ce86c7SWei Liu } 33660ce86c7SWei Liu /* 33760ce86c7SWei Liu * if this is fid for setxattr. clunk should 33860ce86c7SWei Liu * result in setxattr localcall 33960ce86c7SWei Liu */ 34060ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 34160ce86c7SWei Liu /* clunk after partial write */ 34260ce86c7SWei Liu retval = -EINVAL; 34360ce86c7SWei Liu goto free_out; 34460ce86c7SWei Liu } 34560ce86c7SWei Liu if (fidp->fs.xattr.len) { 34660ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 34760ce86c7SWei Liu fidp->fs.xattr.value, 34860ce86c7SWei Liu fidp->fs.xattr.len, 34960ce86c7SWei Liu fidp->fs.xattr.flags); 35060ce86c7SWei Liu } else { 35160ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 35260ce86c7SWei Liu } 35360ce86c7SWei Liu free_out: 35460ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 35560ce86c7SWei Liu free_value: 35660ce86c7SWei Liu g_free(fidp->fs.xattr.value); 35760ce86c7SWei Liu return retval; 35860ce86c7SWei Liu } 35960ce86c7SWei Liu 3608440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 36160ce86c7SWei Liu { 36260ce86c7SWei Liu int retval = 0; 36360ce86c7SWei Liu 36460ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 36560ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 36660ce86c7SWei Liu if (fidp->fs.fd != -1) { 36760ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 36860ce86c7SWei Liu } 36960ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 370f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 37160ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 37260ce86c7SWei Liu } 37360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 37460ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 37560ce86c7SWei Liu } 37660ce86c7SWei Liu v9fs_path_free(&fidp->path); 37760ce86c7SWei Liu g_free(fidp); 37860ce86c7SWei Liu return retval; 37960ce86c7SWei Liu } 38060ce86c7SWei Liu 3818440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 38260ce86c7SWei Liu { 38360ce86c7SWei Liu BUG_ON(!fidp->ref); 38460ce86c7SWei Liu fidp->ref--; 38560ce86c7SWei Liu /* 38660ce86c7SWei Liu * Don't free the fid if it is in reclaim list 38760ce86c7SWei Liu */ 38860ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 38960ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 39060ce86c7SWei Liu /* 39160ce86c7SWei Liu * if the clunked fid is root fid then we 39260ce86c7SWei Liu * have unmounted the fs on the client side. 39360ce86c7SWei Liu * delete the migration blocker. Ideally, this 39460ce86c7SWei Liu * should be hooked to transport close notification 39560ce86c7SWei Liu */ 39660ce86c7SWei Liu if (pdu->s->migration_blocker) { 39760ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 39860ce86c7SWei Liu error_free(pdu->s->migration_blocker); 39960ce86c7SWei Liu pdu->s->migration_blocker = NULL; 40060ce86c7SWei Liu } 40160ce86c7SWei Liu } 40260ce86c7SWei Liu return free_fid(pdu, fidp); 40360ce86c7SWei Liu } 40460ce86c7SWei Liu return 0; 40560ce86c7SWei Liu } 40660ce86c7SWei Liu 40760ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 40860ce86c7SWei Liu { 409feabd6cfSGreg Kurz V9fsFidState *fidp; 41060ce86c7SWei Liu 411feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 412feabd6cfSGreg Kurz if (fidp->fid == fid) { 413feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 4142e53160fSGreg Kurz fidp->clunked = true; 41560ce86c7SWei Liu return fidp; 41660ce86c7SWei Liu } 417feabd6cfSGreg Kurz } 418feabd6cfSGreg Kurz return NULL; 419feabd6cfSGreg Kurz } 42060ce86c7SWei Liu 4218440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 42260ce86c7SWei Liu { 42360ce86c7SWei Liu int reclaim_count = 0; 42460ce86c7SWei Liu V9fsState *s = pdu->s; 42581f9766bSGreg Kurz V9fsFidState *f; 42681f9766bSGreg Kurz QSLIST_HEAD(, V9fsFidState) reclaim_list = 42781f9766bSGreg Kurz QSLIST_HEAD_INITIALIZER(reclaim_list); 42860ce86c7SWei Liu 429feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 43060ce86c7SWei Liu /* 43160ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 43260ce86c7SWei Liu * for them and skip them. Also skip fids 43360ce86c7SWei Liu * currently being operated on. 43460ce86c7SWei Liu */ 43560ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 43660ce86c7SWei Liu continue; 43760ce86c7SWei Liu } 43860ce86c7SWei Liu /* 43960ce86c7SWei Liu * if it is a recently referenced fid 44060ce86c7SWei Liu * we leave the fid untouched and clear the 44160ce86c7SWei Liu * reference bit. We come back to it later 44260ce86c7SWei Liu * in the next iteration. (a simple LRU without 44360ce86c7SWei Liu * moving list elements around) 44460ce86c7SWei Liu */ 44560ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 44660ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 44760ce86c7SWei Liu continue; 44860ce86c7SWei Liu } 44960ce86c7SWei Liu /* 45060ce86c7SWei Liu * Add fids to reclaim list. 45160ce86c7SWei Liu */ 45260ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 45360ce86c7SWei Liu if (f->fs.fd != -1) { 45460ce86c7SWei Liu /* 45560ce86c7SWei Liu * Up the reference count so that 45660ce86c7SWei Liu * a clunk request won't free this fid 45760ce86c7SWei Liu */ 45860ce86c7SWei Liu f->ref++; 45981f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 46060ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 46160ce86c7SWei Liu f->fs.fd = -1; 46260ce86c7SWei Liu reclaim_count++; 46360ce86c7SWei Liu } 46460ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 465f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 46660ce86c7SWei Liu /* 46760ce86c7SWei Liu * Up the reference count so that 46860ce86c7SWei Liu * a clunk request won't free this fid 46960ce86c7SWei Liu */ 47060ce86c7SWei Liu f->ref++; 47181f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 472f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 473f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 47460ce86c7SWei Liu reclaim_count++; 47560ce86c7SWei Liu } 47660ce86c7SWei Liu } 47760ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 47860ce86c7SWei Liu break; 47960ce86c7SWei Liu } 48060ce86c7SWei Liu } 48160ce86c7SWei Liu /* 48260ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 48360ce86c7SWei Liu * are already clunked. 48460ce86c7SWei Liu */ 48581f9766bSGreg Kurz while (!QSLIST_EMPTY(&reclaim_list)) { 48681f9766bSGreg Kurz f = QSLIST_FIRST(&reclaim_list); 48781f9766bSGreg Kurz QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); 48860ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 48960ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 49060ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 49160ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 49260ce86c7SWei Liu } 49360ce86c7SWei Liu /* 49460ce86c7SWei Liu * Now drop the fid reference, free it 49560ce86c7SWei Liu * if clunked. 49660ce86c7SWei Liu */ 49760ce86c7SWei Liu put_fid(pdu, f); 49860ce86c7SWei Liu } 49960ce86c7SWei Liu } 50060ce86c7SWei Liu 5018440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 50260ce86c7SWei Liu { 50360ce86c7SWei Liu int err; 50460ce86c7SWei Liu V9fsState *s = pdu->s; 50520b7f45bSGreg Kurz V9fsFidState *fidp, *fidp_next; 50660ce86c7SWei Liu 50720b7f45bSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 50820b7f45bSGreg Kurz if (!fidp) { 50920b7f45bSGreg Kurz return 0; 51060ce86c7SWei Liu } 51120b7f45bSGreg Kurz 51220b7f45bSGreg Kurz /* 51320b7f45bSGreg Kurz * v9fs_reopen_fid() can yield : a reference on the fid must be held 51420b7f45bSGreg Kurz * to ensure its pointer remains valid and we can safely pass it to 51520b7f45bSGreg Kurz * QSIMPLEQ_NEXT(). The corresponding put_fid() can also yield so 51620b7f45bSGreg Kurz * we must keep a reference on the next fid as well. So the logic here 51720b7f45bSGreg Kurz * is to get a reference on a fid and only put it back during the next 51820b7f45bSGreg Kurz * iteration after we could get a reference on the next fid. Start with 51920b7f45bSGreg Kurz * the first one. 52020b7f45bSGreg Kurz */ 52120b7f45bSGreg Kurz for (fidp->ref++; fidp; fidp = fidp_next) { 52220b7f45bSGreg Kurz if (fidp->path.size == path->size && 52320b7f45bSGreg Kurz !memcmp(fidp->path.data, path->data, path->size)) { 52460ce86c7SWei Liu /* Mark the fid non reclaimable. */ 52560ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 52660ce86c7SWei Liu 52760ce86c7SWei Liu /* reopen the file/dir if already closed */ 52860ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 52960ce86c7SWei Liu if (err < 0) { 53020b7f45bSGreg Kurz put_fid(pdu, fidp); 531267fcadfSGreg Kurz return err; 53260ce86c7SWei Liu } 53320b7f45bSGreg Kurz } 53420b7f45bSGreg Kurz 53520b7f45bSGreg Kurz fidp_next = QSIMPLEQ_NEXT(fidp, next); 53620b7f45bSGreg Kurz 53720b7f45bSGreg Kurz if (fidp_next) { 53860ce86c7SWei Liu /* 53920b7f45bSGreg Kurz * Ensure the next fid survives a potential clunk request during 54020b7f45bSGreg Kurz * put_fid() below and v9fs_reopen_fid() in the next iteration. 54160ce86c7SWei Liu */ 54220b7f45bSGreg Kurz fidp_next->ref++; 54360ce86c7SWei Liu } 54420b7f45bSGreg Kurz 54520b7f45bSGreg Kurz /* We're done with this fid */ 54620b7f45bSGreg Kurz put_fid(pdu, fidp); 54760ce86c7SWei Liu } 54820b7f45bSGreg Kurz 54960ce86c7SWei Liu return 0; 55060ce86c7SWei Liu } 55160ce86c7SWei Liu 5528440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 55360ce86c7SWei Liu { 55460ce86c7SWei Liu V9fsState *s = pdu->s; 55579decce3SGreg Kurz V9fsFidState *fidp; 55660ce86c7SWei Liu 55760ce86c7SWei Liu /* Free all fids */ 558feabd6cfSGreg Kurz while (!QSIMPLEQ_EMPTY(&s->fid_list)) { 5596d54af0eSGreg Kurz /* Get fid */ 560feabd6cfSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 5616d54af0eSGreg Kurz fidp->ref++; 56260ce86c7SWei Liu 5636d54af0eSGreg Kurz /* Clunk fid */ 564feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 5652e53160fSGreg Kurz fidp->clunked = true; 5666d54af0eSGreg Kurz 5676d54af0eSGreg Kurz put_fid(pdu, fidp); 56860ce86c7SWei Liu } 56960ce86c7SWei Liu } 57060ce86c7SWei Liu 57160ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 57260ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 57360ce86c7SWei Liu 57460ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 57560ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 57660ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 57760ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 57860ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 57960ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 58060ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 58160ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 58260ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 58360ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 58460ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 58560ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 58660ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 58760ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 58860ce86c7SWei Liu 58960ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 59060ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 59160ce86c7SWei Liu P9_STAT_MODE_LINK | \ 59260ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 59360ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 59460ce86c7SWei Liu P9_STAT_MODE_SOCKET) 59560ce86c7SWei Liu 5966b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 5976b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 5986b6aa828SChristian Schoenebeck { 5996b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 6006b6aa828SChristian Schoenebeck } 6016b6aa828SChristian Schoenebeck 6026b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 6036b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 6046b6aa828SChristian Schoenebeck { 6056b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 6066b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 6076b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 6086b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 6096b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 6106b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 6116b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 6126b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 6136b6aa828SChristian Schoenebeck } 6146b6aa828SChristian Schoenebeck 6156b6aa828SChristian Schoenebeck /** 6166b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 6176b6aa828SChristian Schoenebeck * 6186b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6196b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6206b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6216b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6226b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6236b6aa828SChristian Schoenebeck * 6246b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6256b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6266b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6276b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6286b6aa828SChristian Schoenebeck * 6296b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6306b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6316b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6326b6aa828SChristian Schoenebeck */ 6336b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6346b6aa828SChristian Schoenebeck 6356b6aa828SChristian Schoenebeck /** 6366b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6376b6aa828SChristian Schoenebeck * 6386b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6396b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6406b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6416b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6426b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6436b6aa828SChristian Schoenebeck * 6446b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6456b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6466b6aa828SChristian Schoenebeck * 6476b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6486b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6496b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6506b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6516b6aa828SChristian Schoenebeck */ 6526b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6536b6aa828SChristian Schoenebeck { 6546b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6556b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6566b6aa828SChristian Schoenebeck return (VariLenAffix) { 6576b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6586b6aa828SChristian Schoenebeck .value = value, 6596b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6606b6aa828SChristian Schoenebeck }; 6616b6aa828SChristian Schoenebeck } 6626b6aa828SChristian Schoenebeck 6636b6aa828SChristian Schoenebeck /** 6646b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6656b6aa828SChristian Schoenebeck * 6666b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6676b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6686b6aa828SChristian Schoenebeck * after the conversion. 6696b6aa828SChristian Schoenebeck * 6706b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6716b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6726b6aa828SChristian Schoenebeck * versa). 6736b6aa828SChristian Schoenebeck */ 6746b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6756b6aa828SChristian Schoenebeck { 6766b6aa828SChristian Schoenebeck return (VariLenAffix) { 6776b6aa828SChristian Schoenebeck .type = 6786b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6796b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6806b6aa828SChristian Schoenebeck .value = 6816b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6826b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6836b6aa828SChristian Schoenebeck .bits = affix->bits 6846b6aa828SChristian Schoenebeck }; 6856b6aa828SChristian Schoenebeck } 6866b6aa828SChristian Schoenebeck 6876b6aa828SChristian Schoenebeck /** 6886b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6896b6aa828SChristian Schoenebeck * 6906b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6916b6aa828SChristian Schoenebeck * 6926b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6936b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6946b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 6956b6aa828SChristian Schoenebeck * 6966b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 6976b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6986b6aa828SChristian Schoenebeck */ 6996b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 7006b6aa828SChristian Schoenebeck { 7016b6aa828SChristian Schoenebeck VariLenAffix prefix; 7026b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 7036b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 7046b6aa828SChristian Schoenebeck } 7056b6aa828SChristian Schoenebeck 7061a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 7071a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 7081a6ed33cSAntonios Motakis { 7091a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 7101a6ed33cSAntonios Motakis } 7111a6ed33cSAntonios Motakis 712f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 713f3fe4a2dSAntonios Motakis { 714f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 715f3fe4a2dSAntonios Motakis } 716f3fe4a2dSAntonios Motakis 7176b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7186b6aa828SChristian Schoenebeck { 7196b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7206b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7216b6aa828SChristian Schoenebeck } 7226b6aa828SChristian Schoenebeck 7236b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7241a6ed33cSAntonios Motakis { 7251a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7261a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7271a6ed33cSAntonios Motakis } 7281a6ed33cSAntonios Motakis 7296b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 730f3fe4a2dSAntonios Motakis { 731f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 732f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 733f3fe4a2dSAntonios Motakis } 734f3fe4a2dSAntonios Motakis 735f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7361a6ed33cSAntonios Motakis { 7371a6ed33cSAntonios Motakis g_free(p); 7381a6ed33cSAntonios Motakis } 7391a6ed33cSAntonios Motakis 740f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7411a6ed33cSAntonios Motakis { 7421a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7431a6ed33cSAntonios Motakis return; 7441a6ed33cSAntonios Motakis } 745f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7461a6ed33cSAntonios Motakis qht_destroy(ht); 7471a6ed33cSAntonios Motakis } 7481a6ed33cSAntonios Motakis 7496b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7506b6aa828SChristian Schoenebeck { 7516b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7526b6aa828SChristian Schoenebeck } 7536b6aa828SChristian Schoenebeck 7541a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7551a6ed33cSAntonios Motakis { 7566b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7571a6ed33cSAntonios Motakis } 7581a6ed33cSAntonios Motakis 759f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 760f3fe4a2dSAntonios Motakis { 7616b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 762f3fe4a2dSAntonios Motakis } 763f3fe4a2dSAntonios Motakis 7646b6aa828SChristian Schoenebeck /* 7656b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7666b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7676b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7686b6aa828SChristian Schoenebeck * 7696b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7706b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7716b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7726b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7736b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7746b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7756b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7766b6aa828SChristian Schoenebeck */ 7776b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7786b6aa828SChristian Schoenebeck { 7796b6aa828SChristian Schoenebeck QpdEntry lookup = { 7806b6aa828SChristian Schoenebeck .dev = dev 7816b6aa828SChristian Schoenebeck }, *val; 7826b6aa828SChristian Schoenebeck uint32_t hash = dev; 7836b6aa828SChristian Schoenebeck VariLenAffix affix; 7846b6aa828SChristian Schoenebeck 7856b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7866b6aa828SChristian Schoenebeck if (!val) { 7876b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7886b6aa828SChristian Schoenebeck *val = lookup; 7896b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7906b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7916b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7926b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7936b6aa828SChristian Schoenebeck } 7946b6aa828SChristian Schoenebeck return val->prefix_bits; 7956b6aa828SChristian Schoenebeck } 7966b6aa828SChristian Schoenebeck 7976b6aa828SChristian Schoenebeck /** 7986b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 7996b6aa828SChristian Schoenebeck * 8006b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 8016b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 8026b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 8036b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 8046b6aa828SChristian Schoenebeck * guest. 8056b6aa828SChristian Schoenebeck * 8066b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 8076b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 8086b6aa828SChristian Schoenebeck * expected ever to be used at all though. 8096b6aa828SChristian Schoenebeck * 8106b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 8116b6aa828SChristian Schoenebeck * 8126b6aa828SChristian Schoenebeck */ 813f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 814f3fe4a2dSAntonios Motakis uint64_t *path) 815f3fe4a2dSAntonios Motakis { 816f3fe4a2dSAntonios Motakis QpfEntry lookup = { 817f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 818f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 819f3fe4a2dSAntonios Motakis }, *val; 820f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8216b6aa828SChristian Schoenebeck VariLenAffix affix; 822f3fe4a2dSAntonios Motakis 823f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 824f3fe4a2dSAntonios Motakis 825f3fe4a2dSAntonios Motakis if (!val) { 826f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 827f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 828f3fe4a2dSAntonios Motakis error_report_once( 829f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 830f3fe4a2dSAntonios Motakis "host to guest." 831f3fe4a2dSAntonios Motakis ); 832f3fe4a2dSAntonios Motakis return -ENFILE; 833f3fe4a2dSAntonios Motakis } 834f3fe4a2dSAntonios Motakis 835f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 836f3fe4a2dSAntonios Motakis *val = lookup; 837f3fe4a2dSAntonios Motakis 838f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8396b6aa828SChristian Schoenebeck affix = affixForIndex( 8406b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8416b6aa828SChristian Schoenebeck ); 8426b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8436b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 844f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 845f3fe4a2dSAntonios Motakis } 846f3fe4a2dSAntonios Motakis 847f3fe4a2dSAntonios Motakis *path = val->path; 848f3fe4a2dSAntonios Motakis return 0; 849f3fe4a2dSAntonios Motakis } 850f3fe4a2dSAntonios Motakis 8516b6aa828SChristian Schoenebeck /** 8526b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8531a6ed33cSAntonios Motakis * 8546b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8556b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8566b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8576b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8586b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8596b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8606b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8616b6aa828SChristian Schoenebeck * that is). 8626b6aa828SChristian Schoenebeck * 8636b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8646b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8656b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8666b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8676b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8686b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8696b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8706b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8716b6aa828SChristian Schoenebeck * 8726b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8736b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8746b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8756b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8766b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8776b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8786b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8796b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8806b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8816b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8826b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8836b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8846b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8856b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8866b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8876b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8886b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8891a6ed33cSAntonios Motakis */ 8906b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8911a6ed33cSAntonios Motakis uint64_t *path) 8921a6ed33cSAntonios Motakis { 8936b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8941a6ed33cSAntonios Motakis QppEntry lookup = { 8951a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 8966b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 8971a6ed33cSAntonios Motakis }, *val; 8981a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 8991a6ed33cSAntonios Motakis 9001a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 9011a6ed33cSAntonios Motakis 9021a6ed33cSAntonios Motakis if (!val) { 9036b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 9046b6aa828SChristian Schoenebeck /* we ran out of affixes */ 905f3fe4a2dSAntonios Motakis warn_report_once( 906f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 9071a6ed33cSAntonios Motakis ); 9081a6ed33cSAntonios Motakis return -ENFILE; 9091a6ed33cSAntonios Motakis } 9101a6ed33cSAntonios Motakis 9111a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 9121a6ed33cSAntonios Motakis *val = lookup; 9131a6ed33cSAntonios Motakis 9146b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 9156b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 9166b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 9171a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9181a6ed33cSAntonios Motakis } 9196b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9206b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9211a6ed33cSAntonios Motakis return 0; 9221a6ed33cSAntonios Motakis } 9231a6ed33cSAntonios Motakis 9243b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 92560ce86c7SWei Liu { 9261a6ed33cSAntonios Motakis int err; 92760ce86c7SWei Liu size_t size; 92860ce86c7SWei Liu 9291a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9301a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9316b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 932f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 933f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 934f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 935f3fe4a2dSAntonios Motakis } 9361a6ed33cSAntonios Motakis if (err) { 9371a6ed33cSAntonios Motakis return err; 9381a6ed33cSAntonios Motakis } 9391a6ed33cSAntonios Motakis } else { 9403b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9411a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9421a6ed33cSAntonios Motakis error_report_once( 9431a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9441a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9451a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9461a6ed33cSAntonios Motakis "effective." 9471a6ed33cSAntonios Motakis ); 9481a6ed33cSAntonios Motakis return -ENODEV; 9491a6ed33cSAntonios Motakis } else { 9503b5ee9e8SAntonios Motakis warn_report_once( 9513b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9523b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9531a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9541a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9551a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9563b5ee9e8SAntonios Motakis ); 9573b5ee9e8SAntonios Motakis } 9581a6ed33cSAntonios Motakis } 95960ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 96060ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 96160ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9621a6ed33cSAntonios Motakis } 9631a6ed33cSAntonios Motakis 96460ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 96560ce86c7SWei Liu qidp->type = 0; 96660ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 96760ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 96860ce86c7SWei Liu } 96960ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 97060ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 97160ce86c7SWei Liu } 9723b5ee9e8SAntonios Motakis 9733b5ee9e8SAntonios Motakis return 0; 97460ce86c7SWei Liu } 97560ce86c7SWei Liu 97660ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 97760ce86c7SWei Liu { 97860ce86c7SWei Liu V9fsPDU *pdu = NULL; 97960ce86c7SWei Liu 98060ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 98160ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 98260ce86c7SWei Liu QLIST_REMOVE(pdu, next); 98360ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 98460ce86c7SWei Liu } 98560ce86c7SWei Liu return pdu; 98660ce86c7SWei Liu } 98760ce86c7SWei Liu 98860ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 98960ce86c7SWei Liu { 99060ce86c7SWei Liu V9fsState *s = pdu->s; 991f74e27bfSGreg Kurz 992f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 99360ce86c7SWei Liu QLIST_REMOVE(pdu, next); 99460ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 99560ce86c7SWei Liu } 99660ce86c7SWei Liu 9978440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 99860ce86c7SWei Liu { 99960ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 100060ce86c7SWei Liu V9fsState *s = pdu->s; 100106a37db7SGreg Kurz int ret; 100260ce86c7SWei Liu 1003fc78d5eeSKeno Fischer /* 1004fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1005fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1006fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1007fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1008fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1009fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1010fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1011fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1012fc78d5eeSKeno Fischer * transmission of the reply. 1013fc78d5eeSKeno Fischer */ 1014fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1015fc78d5eeSKeno Fischer if (discard) { 1016fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1017fc78d5eeSKeno Fischer pdu->size = 0; 1018fc78d5eeSKeno Fischer goto out_notify; 1019fc78d5eeSKeno Fischer } 1020fc78d5eeSKeno Fischer 102160ce86c7SWei Liu if (len < 0) { 102260ce86c7SWei Liu int err = -len; 102360ce86c7SWei Liu len = 7; 102460ce86c7SWei Liu 102560ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 102660ce86c7SWei Liu V9fsString str; 102760ce86c7SWei Liu 102860ce86c7SWei Liu str.data = strerror(err); 102960ce86c7SWei Liu str.size = strlen(str.data); 103060ce86c7SWei Liu 103106a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 103206a37db7SGreg Kurz if (ret < 0) { 103306a37db7SGreg Kurz goto out_notify; 103406a37db7SGreg Kurz } 103506a37db7SGreg Kurz len += ret; 103660ce86c7SWei Liu id = P9_RERROR; 103760ce86c7SWei Liu } 103860ce86c7SWei Liu 103906a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 104006a37db7SGreg Kurz if (ret < 0) { 104106a37db7SGreg Kurz goto out_notify; 104206a37db7SGreg Kurz } 104306a37db7SGreg Kurz len += ret; 104460ce86c7SWei Liu 104560ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 104660ce86c7SWei Liu id = P9_RLERROR; 104760ce86c7SWei Liu } 104860ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 104960ce86c7SWei Liu } 105060ce86c7SWei Liu 105160ce86c7SWei Liu /* fill out the header */ 105206a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 105306a37db7SGreg Kurz goto out_notify; 105406a37db7SGreg Kurz } 105560ce86c7SWei Liu 105660ce86c7SWei Liu /* keep these in sync */ 105760ce86c7SWei Liu pdu->size = len; 105860ce86c7SWei Liu pdu->id = id; 105960ce86c7SWei Liu 106006a37db7SGreg Kurz out_notify: 1061a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 106260ce86c7SWei Liu 106360ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1064f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 106560ce86c7SWei Liu pdu_free(pdu); 106660ce86c7SWei Liu } 1067f74e27bfSGreg Kurz } 106860ce86c7SWei Liu 106960ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 107060ce86c7SWei Liu { 107160ce86c7SWei Liu mode_t ret; 107260ce86c7SWei Liu 107360ce86c7SWei Liu ret = mode & 0777; 107460ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 107560ce86c7SWei Liu ret |= S_IFDIR; 107660ce86c7SWei Liu } 107760ce86c7SWei Liu 107860ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 107960ce86c7SWei Liu ret |= S_IFLNK; 108060ce86c7SWei Liu } 108160ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 108260ce86c7SWei Liu ret |= S_IFSOCK; 108360ce86c7SWei Liu } 108460ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 108560ce86c7SWei Liu ret |= S_IFIFO; 108660ce86c7SWei Liu } 108760ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 108860ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 108960ce86c7SWei Liu ret |= S_IFCHR; 109060ce86c7SWei Liu } else { 109160ce86c7SWei Liu ret |= S_IFBLK; 109260ce86c7SWei Liu } 109360ce86c7SWei Liu } 109460ce86c7SWei Liu 109560ce86c7SWei Liu if (!(ret & ~0777)) { 109660ce86c7SWei Liu ret |= S_IFREG; 109760ce86c7SWei Liu } 109860ce86c7SWei Liu 109960ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 110060ce86c7SWei Liu ret |= S_ISUID; 110160ce86c7SWei Liu } 110260ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 110360ce86c7SWei Liu ret |= S_ISGID; 110460ce86c7SWei Liu } 110560ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 110660ce86c7SWei Liu ret |= S_ISVTX; 110760ce86c7SWei Liu } 110860ce86c7SWei Liu 110960ce86c7SWei Liu return ret; 111060ce86c7SWei Liu } 111160ce86c7SWei Liu 111260ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 111360ce86c7SWei Liu { 111460ce86c7SWei Liu if (stat->type == -1 && 111560ce86c7SWei Liu stat->dev == -1 && 111687032833SAntonios Motakis stat->qid.type == 0xff && 111787032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 111887032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 111960ce86c7SWei Liu stat->mode == -1 && 112060ce86c7SWei Liu stat->atime == -1 && 112160ce86c7SWei Liu stat->mtime == -1 && 112260ce86c7SWei Liu stat->length == -1 && 112360ce86c7SWei Liu !stat->name.size && 112460ce86c7SWei Liu !stat->uid.size && 112560ce86c7SWei Liu !stat->gid.size && 112660ce86c7SWei Liu !stat->muid.size && 112760ce86c7SWei Liu stat->n_uid == -1 && 112860ce86c7SWei Liu stat->n_gid == -1 && 112960ce86c7SWei Liu stat->n_muid == -1) { 113060ce86c7SWei Liu return 1; 113160ce86c7SWei Liu } 113260ce86c7SWei Liu 113360ce86c7SWei Liu return 0; 113460ce86c7SWei Liu } 113560ce86c7SWei Liu 113660ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 113760ce86c7SWei Liu { 113860ce86c7SWei Liu v9fs_string_init(&stat->name); 113960ce86c7SWei Liu v9fs_string_init(&stat->uid); 114060ce86c7SWei Liu v9fs_string_init(&stat->gid); 114160ce86c7SWei Liu v9fs_string_init(&stat->muid); 114260ce86c7SWei Liu v9fs_string_init(&stat->extension); 114360ce86c7SWei Liu } 114460ce86c7SWei Liu 114560ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 114660ce86c7SWei Liu { 114760ce86c7SWei Liu v9fs_string_free(&stat->name); 114860ce86c7SWei Liu v9fs_string_free(&stat->uid); 114960ce86c7SWei Liu v9fs_string_free(&stat->gid); 115060ce86c7SWei Liu v9fs_string_free(&stat->muid); 115160ce86c7SWei Liu v9fs_string_free(&stat->extension); 115260ce86c7SWei Liu } 115360ce86c7SWei Liu 115460ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 115560ce86c7SWei Liu { 115660ce86c7SWei Liu uint32_t mode; 115760ce86c7SWei Liu 115860ce86c7SWei Liu mode = stbuf->st_mode & 0777; 115960ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 116060ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 116160ce86c7SWei Liu } 116260ce86c7SWei Liu 116360ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 116460ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 116560ce86c7SWei Liu } 116660ce86c7SWei Liu 116760ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 116860ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 116960ce86c7SWei Liu } 117060ce86c7SWei Liu 117160ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 117260ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 117360ce86c7SWei Liu } 117460ce86c7SWei Liu 117560ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 117660ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 117760ce86c7SWei Liu } 117860ce86c7SWei Liu 117960ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 118060ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 118160ce86c7SWei Liu } 118260ce86c7SWei Liu 118360ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 118460ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 118560ce86c7SWei Liu } 118660ce86c7SWei Liu 118760ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 118860ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 118960ce86c7SWei Liu } 119060ce86c7SWei Liu 119160ce86c7SWei Liu return mode; 119260ce86c7SWei Liu } 119360ce86c7SWei Liu 11946069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 11956069537fSJan Dakinevich const char *basename, 119660ce86c7SWei Liu const struct stat *stbuf, 119760ce86c7SWei Liu V9fsStat *v9stat) 119860ce86c7SWei Liu { 119960ce86c7SWei Liu int err; 120060ce86c7SWei Liu 120160ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 120260ce86c7SWei Liu 12033b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12043b5ee9e8SAntonios Motakis if (err < 0) { 12053b5ee9e8SAntonios Motakis return err; 12063b5ee9e8SAntonios Motakis } 120760ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 120860ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 120960ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 121060ce86c7SWei Liu v9stat->length = stbuf->st_size; 121160ce86c7SWei Liu 1212abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1213abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1214abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 121560ce86c7SWei Liu 121660ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 121760ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 121860ce86c7SWei Liu v9stat->n_muid = 0; 121960ce86c7SWei Liu 1220abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 122160ce86c7SWei Liu 122260ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12236069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 122460ce86c7SWei Liu if (err < 0) { 122560ce86c7SWei Liu return err; 122660ce86c7SWei Liu } 122760ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 122860ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 122960ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 123060ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 123160ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 123260ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 123360ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 123460ce86c7SWei Liu } 123560ce86c7SWei Liu 12366069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 123760ce86c7SWei Liu 123860ce86c7SWei Liu v9stat->size = 61 + 123960ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 124060ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 124160ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 124260ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 124360ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 124460ce86c7SWei Liu return 0; 124560ce86c7SWei Liu } 124660ce86c7SWei Liu 124760ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 124860ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 124960ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 125060ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 125160ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 125260ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 125360ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 125460ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 125560ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 125660ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 125760ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 125860ce86c7SWei Liu 125960ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 126060ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 126160ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 126260ce86c7SWei Liu 126360ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 126460ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 126560ce86c7SWei Liu 126660ce86c7SWei Liu 1267b565bccbSChristian Schoenebeck /** 1268b565bccbSChristian Schoenebeck * Convert host filesystem's block size into an appropriate block size for 1269b565bccbSChristian Schoenebeck * 9p client (guest OS side). The value returned suggests an "optimum" block 1270b565bccbSChristian Schoenebeck * size for 9p I/O, i.e. to maximize performance. 1271b565bccbSChristian Schoenebeck * 1272b565bccbSChristian Schoenebeck * @pdu: 9p client request 1273b565bccbSChristian Schoenebeck * @blksize: host filesystem's block size 1274b565bccbSChristian Schoenebeck */ 1275b565bccbSChristian Schoenebeck static int32_t blksize_to_iounit(const V9fsPDU *pdu, int32_t blksize) 1276669ced09SChristian Schoenebeck { 1277669ced09SChristian Schoenebeck int32_t iounit = 0; 1278669ced09SChristian Schoenebeck V9fsState *s = pdu->s; 1279669ced09SChristian Schoenebeck 1280669ced09SChristian Schoenebeck /* 1281b565bccbSChristian Schoenebeck * iounit should be multiples of blksize (host filesystem block size) 1282669ced09SChristian Schoenebeck * as well as less than (client msize - P9_IOHDRSZ) 1283669ced09SChristian Schoenebeck */ 1284b565bccbSChristian Schoenebeck if (blksize) { 128504a7f9e5SChristian Schoenebeck iounit = QEMU_ALIGN_DOWN(s->msize - P9_IOHDRSZ, blksize); 1286669ced09SChristian Schoenebeck } 1287669ced09SChristian Schoenebeck if (!iounit) { 1288669ced09SChristian Schoenebeck iounit = s->msize - P9_IOHDRSZ; 1289669ced09SChristian Schoenebeck } 1290669ced09SChristian Schoenebeck return iounit; 1291669ced09SChristian Schoenebeck } 1292669ced09SChristian Schoenebeck 1293b565bccbSChristian Schoenebeck static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf) 1294b565bccbSChristian Schoenebeck { 1295b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, stbuf->st_blksize); 1296b565bccbSChristian Schoenebeck } 1297b565bccbSChristian Schoenebeck 12983b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 129960ce86c7SWei Liu V9fsStatDotl *v9lstat) 130060ce86c7SWei Liu { 130160ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 130260ce86c7SWei Liu 130360ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 130460ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 130560ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 130660ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 130760ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 130860ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 1309669ced09SChristian Schoenebeck v9lstat->st_blksize = stat_to_iounit(pdu, stbuf); 131060ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 131160ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 131260ce86c7SWei Liu v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 131360ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 131460ce86c7SWei Liu v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 131560ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 131660ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 131760ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 131860ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 131960ce86c7SWei Liu 13203b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 132160ce86c7SWei Liu } 132260ce86c7SWei Liu 132360ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 132460ce86c7SWei Liu { 132560ce86c7SWei Liu int i; 132660ce86c7SWei Liu 132760ce86c7SWei Liu printf("sg[%d]: {", cnt); 132860ce86c7SWei Liu for (i = 0; i < cnt; i++) { 132960ce86c7SWei Liu if (i) { 133060ce86c7SWei Liu printf(", "); 133160ce86c7SWei Liu } 133260ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 133360ce86c7SWei Liu } 133460ce86c7SWei Liu printf("}\n"); 133560ce86c7SWei Liu } 133660ce86c7SWei Liu 133760ce86c7SWei Liu /* Will call this only for path name based fid */ 133860ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 133960ce86c7SWei Liu { 134060ce86c7SWei Liu V9fsPath str; 134160ce86c7SWei Liu v9fs_path_init(&str); 134260ce86c7SWei Liu v9fs_path_copy(&str, dst); 1343e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 134460ce86c7SWei Liu v9fs_path_free(&str); 134560ce86c7SWei Liu } 134660ce86c7SWei Liu 134760ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 134860ce86c7SWei Liu { 134960ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 135060ce86c7SWei Liu } 135160ce86c7SWei Liu 13528440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 135360ce86c7SWei Liu { 135460ce86c7SWei Liu ssize_t err; 135560ce86c7SWei Liu V9fsPDU *pdu = opaque; 135660ce86c7SWei Liu V9fsState *s = pdu->s; 135760ce86c7SWei Liu V9fsString version; 135860ce86c7SWei Liu size_t offset = 7; 135960ce86c7SWei Liu 136060ce86c7SWei Liu v9fs_string_init(&version); 136160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 136260ce86c7SWei Liu if (err < 0) { 136360ce86c7SWei Liu goto out; 136460ce86c7SWei Liu } 136560ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 136660ce86c7SWei Liu 136760ce86c7SWei Liu virtfs_reset(pdu); 136860ce86c7SWei Liu 136960ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 137060ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 137160ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 137260ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 137360ce86c7SWei Liu } else { 137460ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1375e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1376e16453a3SChristian Schoenebeck goto marshal; 137760ce86c7SWei Liu } 137860ce86c7SWei Liu 1379e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1380e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1381e16453a3SChristian Schoenebeck error_report( 1382e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1383e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1384e16453a3SChristian Schoenebeck ); 1385e16453a3SChristian Schoenebeck goto out; 1386e16453a3SChristian Schoenebeck } 1387e16453a3SChristian Schoenebeck 138862777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1389c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 139062777d82SChristian Schoenebeck warn_report_once( 139162777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 139262777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 139362777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 139462777d82SChristian Schoenebeck ); 139562777d82SChristian Schoenebeck } 139662777d82SChristian Schoenebeck 1397e16453a3SChristian Schoenebeck marshal: 139860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 139960ce86c7SWei Liu if (err < 0) { 140060ce86c7SWei Liu goto out; 140160ce86c7SWei Liu } 1402403a905bSPhilippe Mathieu-Daudé err += offset; 140360ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 140460ce86c7SWei Liu out: 1405403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 140660ce86c7SWei Liu v9fs_string_free(&version); 140760ce86c7SWei Liu } 140860ce86c7SWei Liu 14098440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 141060ce86c7SWei Liu { 141160ce86c7SWei Liu V9fsPDU *pdu = opaque; 141260ce86c7SWei Liu V9fsState *s = pdu->s; 141360ce86c7SWei Liu int32_t fid, afid, n_uname; 141460ce86c7SWei Liu V9fsString uname, aname; 141560ce86c7SWei Liu V9fsFidState *fidp; 141660ce86c7SWei Liu size_t offset = 7; 141760ce86c7SWei Liu V9fsQID qid; 141860ce86c7SWei Liu ssize_t err; 141911024375SChristian Schoenebeck struct stat stbuf; 142060ce86c7SWei Liu 142160ce86c7SWei Liu v9fs_string_init(&uname); 142260ce86c7SWei Liu v9fs_string_init(&aname); 142360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 142460ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 142560ce86c7SWei Liu if (err < 0) { 142660ce86c7SWei Liu goto out_nofid; 142760ce86c7SWei Liu } 142860ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 142960ce86c7SWei Liu 143060ce86c7SWei Liu fidp = alloc_fid(s, fid); 143160ce86c7SWei Liu if (fidp == NULL) { 143260ce86c7SWei Liu err = -EINVAL; 143360ce86c7SWei Liu goto out_nofid; 143460ce86c7SWei Liu } 143560ce86c7SWei Liu fidp->uid = n_uname; 143660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 143760ce86c7SWei Liu if (err < 0) { 143860ce86c7SWei Liu err = -EINVAL; 143960ce86c7SWei Liu clunk_fid(s, fid); 144060ce86c7SWei Liu goto out; 144160ce86c7SWei Liu } 144211024375SChristian Schoenebeck err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 144311024375SChristian Schoenebeck if (err < 0) { 144411024375SChristian Schoenebeck err = -EINVAL; 144511024375SChristian Schoenebeck clunk_fid(s, fid); 144611024375SChristian Schoenebeck goto out; 144711024375SChristian Schoenebeck } 144811024375SChristian Schoenebeck err = stat_to_qid(pdu, &stbuf, &qid); 144960ce86c7SWei Liu if (err < 0) { 145060ce86c7SWei Liu err = -EINVAL; 145160ce86c7SWei Liu clunk_fid(s, fid); 145260ce86c7SWei Liu goto out; 145360ce86c7SWei Liu } 1454fe44dc91SAshijeet Acharya 1455fe44dc91SAshijeet Acharya /* 1456fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1457fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1458fe44dc91SAshijeet Acharya */ 1459fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1460fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1461fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1462fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14639261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14649261ef5eSMarkus Armbruster if (err < 0) { 1465fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1466fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1467fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1468fe44dc91SAshijeet Acharya goto out; 1469fe44dc91SAshijeet Acharya } 1470fe44dc91SAshijeet Acharya s->root_fid = fid; 1471fe44dc91SAshijeet Acharya } 1472fe44dc91SAshijeet Acharya 147360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 147460ce86c7SWei Liu if (err < 0) { 147560ce86c7SWei Liu clunk_fid(s, fid); 147660ce86c7SWei Liu goto out; 147760ce86c7SWei Liu } 147860ce86c7SWei Liu err += offset; 1479fe44dc91SAshijeet Acharya 148011024375SChristian Schoenebeck memcpy(&s->root_st, &stbuf, sizeof(stbuf)); 148160ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 148260ce86c7SWei Liu qid.type, qid.version, qid.path); 148360ce86c7SWei Liu out: 148460ce86c7SWei Liu put_fid(pdu, fidp); 148560ce86c7SWei Liu out_nofid: 148660ce86c7SWei Liu pdu_complete(pdu, err); 148760ce86c7SWei Liu v9fs_string_free(&uname); 148860ce86c7SWei Liu v9fs_string_free(&aname); 148960ce86c7SWei Liu } 149060ce86c7SWei Liu 14918440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 149260ce86c7SWei Liu { 149360ce86c7SWei Liu int32_t fid; 149460ce86c7SWei Liu V9fsStat v9stat; 149560ce86c7SWei Liu ssize_t err = 0; 149660ce86c7SWei Liu size_t offset = 7; 149760ce86c7SWei Liu struct stat stbuf; 149860ce86c7SWei Liu V9fsFidState *fidp; 149960ce86c7SWei Liu V9fsPDU *pdu = opaque; 15006069537fSJan Dakinevich char *basename; 150160ce86c7SWei Liu 150260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 150360ce86c7SWei Liu if (err < 0) { 150460ce86c7SWei Liu goto out_nofid; 150560ce86c7SWei Liu } 150660ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 150760ce86c7SWei Liu 150860ce86c7SWei Liu fidp = get_fid(pdu, fid); 150960ce86c7SWei Liu if (fidp == NULL) { 151060ce86c7SWei Liu err = -ENOENT; 151160ce86c7SWei Liu goto out_nofid; 151260ce86c7SWei Liu } 151360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 151460ce86c7SWei Liu if (err < 0) { 151560ce86c7SWei Liu goto out; 151660ce86c7SWei Liu } 15176069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 15186069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 15196069537fSJan Dakinevich g_free(basename); 152060ce86c7SWei Liu if (err < 0) { 152160ce86c7SWei Liu goto out; 152260ce86c7SWei Liu } 152360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 152460ce86c7SWei Liu if (err < 0) { 152560ce86c7SWei Liu v9fs_stat_free(&v9stat); 152660ce86c7SWei Liu goto out; 152760ce86c7SWei Liu } 152860ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 152960ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 153060ce86c7SWei Liu err += offset; 153160ce86c7SWei Liu v9fs_stat_free(&v9stat); 153260ce86c7SWei Liu out: 153360ce86c7SWei Liu put_fid(pdu, fidp); 153460ce86c7SWei Liu out_nofid: 153560ce86c7SWei Liu pdu_complete(pdu, err); 153660ce86c7SWei Liu } 153760ce86c7SWei Liu 15388440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 153960ce86c7SWei Liu { 154060ce86c7SWei Liu int32_t fid; 154160ce86c7SWei Liu size_t offset = 7; 154260ce86c7SWei Liu ssize_t retval = 0; 154360ce86c7SWei Liu struct stat stbuf; 154460ce86c7SWei Liu V9fsFidState *fidp; 154560ce86c7SWei Liu uint64_t request_mask; 154660ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 154760ce86c7SWei Liu V9fsPDU *pdu = opaque; 154860ce86c7SWei Liu 154960ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 155060ce86c7SWei Liu if (retval < 0) { 155160ce86c7SWei Liu goto out_nofid; 155260ce86c7SWei Liu } 155360ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 155460ce86c7SWei Liu 155560ce86c7SWei Liu fidp = get_fid(pdu, fid); 155660ce86c7SWei Liu if (fidp == NULL) { 155760ce86c7SWei Liu retval = -ENOENT; 155860ce86c7SWei Liu goto out_nofid; 155960ce86c7SWei Liu } 156060ce86c7SWei Liu /* 156160ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 156260ce86c7SWei Liu * need to look at request_mask. 156360ce86c7SWei Liu */ 156460ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 156560ce86c7SWei Liu if (retval < 0) { 156660ce86c7SWei Liu goto out; 156760ce86c7SWei Liu } 15683b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15693b5ee9e8SAntonios Motakis if (retval < 0) { 15703b5ee9e8SAntonios Motakis goto out; 15713b5ee9e8SAntonios Motakis } 157260ce86c7SWei Liu 157360ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 157460ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 157560ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 157660ce86c7SWei Liu switch (retval) { 157760ce86c7SWei Liu case 0: 157860ce86c7SWei Liu /* we have valid st_gen: update result mask */ 157960ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 158060ce86c7SWei Liu break; 158160ce86c7SWei Liu case -EINTR: 158260ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 158360ce86c7SWei Liu goto out; 158460ce86c7SWei Liu default: 158560ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 158660ce86c7SWei Liu break; 158760ce86c7SWei Liu } 158860ce86c7SWei Liu } 158960ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 159060ce86c7SWei Liu if (retval < 0) { 159160ce86c7SWei Liu goto out; 159260ce86c7SWei Liu } 159360ce86c7SWei Liu retval += offset; 159460ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 159560ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 159660ce86c7SWei Liu v9stat_dotl.st_gid); 159760ce86c7SWei Liu out: 159860ce86c7SWei Liu put_fid(pdu, fidp); 159960ce86c7SWei Liu out_nofid: 160060ce86c7SWei Liu pdu_complete(pdu, retval); 160160ce86c7SWei Liu } 160260ce86c7SWei Liu 160360ce86c7SWei Liu /* Attribute flags */ 160460ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 160560ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 160660ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 160760ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 160860ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 160960ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 161060ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 161160ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 161260ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 161360ce86c7SWei Liu 161460ce86c7SWei Liu #define P9_ATTR_MASK 127 161560ce86c7SWei Liu 16168440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 161760ce86c7SWei Liu { 161860ce86c7SWei Liu int err = 0; 161960ce86c7SWei Liu int32_t fid; 162060ce86c7SWei Liu V9fsFidState *fidp; 162160ce86c7SWei Liu size_t offset = 7; 162260ce86c7SWei Liu V9fsIattr v9iattr; 162360ce86c7SWei Liu V9fsPDU *pdu = opaque; 162460ce86c7SWei Liu 162560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 162660ce86c7SWei Liu if (err < 0) { 162760ce86c7SWei Liu goto out_nofid; 162860ce86c7SWei Liu } 162960ce86c7SWei Liu 16308f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16318f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16328f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16338f9c64bfSGreg Kurz 163460ce86c7SWei Liu fidp = get_fid(pdu, fid); 163560ce86c7SWei Liu if (fidp == NULL) { 163660ce86c7SWei Liu err = -EINVAL; 163760ce86c7SWei Liu goto out_nofid; 163860ce86c7SWei Liu } 163960ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 164060ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 164160ce86c7SWei Liu if (err < 0) { 164260ce86c7SWei Liu goto out; 164360ce86c7SWei Liu } 164460ce86c7SWei Liu } 164560ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 164660ce86c7SWei Liu struct timespec times[2]; 164760ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 164860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 164960ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 165060ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 165160ce86c7SWei Liu } else { 165260ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 165360ce86c7SWei Liu } 165460ce86c7SWei Liu } else { 165560ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 165660ce86c7SWei Liu } 165760ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 165860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 165960ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 166060ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 166160ce86c7SWei Liu } else { 166260ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 166360ce86c7SWei Liu } 166460ce86c7SWei Liu } else { 166560ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 166660ce86c7SWei Liu } 166760ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 166860ce86c7SWei Liu if (err < 0) { 166960ce86c7SWei Liu goto out; 167060ce86c7SWei Liu } 167160ce86c7SWei Liu } 167260ce86c7SWei Liu /* 167360ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 167460ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 167560ce86c7SWei Liu */ 167660ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 167760ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 167860ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 167960ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 168060ce86c7SWei Liu v9iattr.uid = -1; 168160ce86c7SWei Liu } 168260ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 168360ce86c7SWei Liu v9iattr.gid = -1; 168460ce86c7SWei Liu } 168560ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 168660ce86c7SWei Liu v9iattr.gid); 168760ce86c7SWei Liu if (err < 0) { 168860ce86c7SWei Liu goto out; 168960ce86c7SWei Liu } 169060ce86c7SWei Liu } 169160ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 169260ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 169360ce86c7SWei Liu if (err < 0) { 169460ce86c7SWei Liu goto out; 169560ce86c7SWei Liu } 169660ce86c7SWei Liu } 169760ce86c7SWei Liu err = offset; 16988f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 169960ce86c7SWei Liu out: 170060ce86c7SWei Liu put_fid(pdu, fidp); 170160ce86c7SWei Liu out_nofid: 170260ce86c7SWei Liu pdu_complete(pdu, err); 170360ce86c7SWei Liu } 170460ce86c7SWei Liu 170560ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 170660ce86c7SWei Liu { 170760ce86c7SWei Liu int i; 170860ce86c7SWei Liu ssize_t err; 170960ce86c7SWei Liu size_t offset = 7; 171060ce86c7SWei Liu 171160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 171260ce86c7SWei Liu if (err < 0) { 171360ce86c7SWei Liu return err; 171460ce86c7SWei Liu } 171560ce86c7SWei Liu offset += err; 171660ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 171760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 171860ce86c7SWei Liu if (err < 0) { 171960ce86c7SWei Liu return err; 172060ce86c7SWei Liu } 172160ce86c7SWei Liu offset += err; 172260ce86c7SWei Liu } 172360ce86c7SWei Liu return offset; 172460ce86c7SWei Liu } 172560ce86c7SWei Liu 1726fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1727fff39a7aSGreg Kurz { 1728fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1729fff39a7aSGreg Kurz } 1730fff39a7aSGreg Kurz 1731f22cad42SChristian Schoenebeck static bool same_stat_id(const struct stat *a, const struct stat *b) 173256f101ecSGreg Kurz { 1733f22cad42SChristian Schoenebeck return a->st_dev == b->st_dev && a->st_ino == b->st_ino; 173456f101ecSGreg Kurz } 173556f101ecSGreg Kurz 17368440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 173760ce86c7SWei Liu { 173860ce86c7SWei Liu int name_idx; 1739869605b5SChristian Schoenebeck g_autofree V9fsQID *qids = NULL; 174060ce86c7SWei Liu int i, err = 0; 1741*7e985780SChristian Schoenebeck V9fsPath dpath, path; 1742*7e985780SChristian Schoenebeck P9ARRAY_REF(V9fsPath) pathes = NULL; 174360ce86c7SWei Liu uint16_t nwnames; 1744869605b5SChristian Schoenebeck struct stat stbuf, fidst; 1745869605b5SChristian Schoenebeck g_autofree struct stat *stbufs = NULL; 174660ce86c7SWei Liu size_t offset = 7; 174760ce86c7SWei Liu int32_t fid, newfid; 1748*7e985780SChristian Schoenebeck P9ARRAY_REF(V9fsString) wnames = NULL; 174960ce86c7SWei Liu V9fsFidState *fidp; 175060ce86c7SWei Liu V9fsFidState *newfidp = NULL; 175160ce86c7SWei Liu V9fsPDU *pdu = opaque; 175260ce86c7SWei Liu V9fsState *s = pdu->s; 175356f101ecSGreg Kurz V9fsQID qid; 175460ce86c7SWei Liu 175560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 175660ce86c7SWei Liu if (err < 0) { 175760ce86c7SWei Liu pdu_complete(pdu, err); 175860ce86c7SWei Liu return ; 175960ce86c7SWei Liu } 176060ce86c7SWei Liu offset += err; 176160ce86c7SWei Liu 176260ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 176360ce86c7SWei Liu 1764232a4d2cSChristian Schoenebeck if (nwnames > P9_MAXWELEM) { 1765232a4d2cSChristian Schoenebeck err = -EINVAL; 1766232a4d2cSChristian Schoenebeck goto out_nofid; 1767232a4d2cSChristian Schoenebeck } 1768232a4d2cSChristian Schoenebeck if (nwnames) { 1769*7e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsString, wnames, nwnames); 17701923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 17718d6cb100SChristian Schoenebeck stbufs = g_new0(struct stat, nwnames); 1772*7e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsPath, pathes, nwnames); 177360ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 177460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 177560ce86c7SWei Liu if (err < 0) { 177660ce86c7SWei Liu goto out_nofid; 177760ce86c7SWei Liu } 1778fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1779fff39a7aSGreg Kurz err = -ENOENT; 1780fff39a7aSGreg Kurz goto out_nofid; 1781fff39a7aSGreg Kurz } 178260ce86c7SWei Liu offset += err; 178360ce86c7SWei Liu } 178460ce86c7SWei Liu } 178560ce86c7SWei Liu fidp = get_fid(pdu, fid); 178660ce86c7SWei Liu if (fidp == NULL) { 178760ce86c7SWei Liu err = -ENOENT; 178860ce86c7SWei Liu goto out_nofid; 178960ce86c7SWei Liu } 179056f101ecSGreg Kurz 179113fd08e6SGreg Kurz v9fs_path_init(&dpath); 179213fd08e6SGreg Kurz v9fs_path_init(&path); 179360ce86c7SWei Liu /* 17948d6cb100SChristian Schoenebeck * Both dpath and path initially point to fidp. 179560ce86c7SWei Liu * Needed to handle request with nwnames == 0 179660ce86c7SWei Liu */ 179760ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 179860ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 17998d6cb100SChristian Schoenebeck 18008d6cb100SChristian Schoenebeck /* 18018d6cb100SChristian Schoenebeck * To keep latency (i.e. overall execution time for processing this 18028d6cb100SChristian Schoenebeck * Twalk client request) as small as possible, run all the required fs 18038d6cb100SChristian Schoenebeck * driver code altogether inside the following block. 18048d6cb100SChristian Schoenebeck */ 18058d6cb100SChristian Schoenebeck v9fs_co_run_in_worker({ 18068d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18078d6cb100SChristian Schoenebeck err = -EINTR; 18088d6cb100SChristian Schoenebeck break; 18098d6cb100SChristian Schoenebeck } 18108d6cb100SChristian Schoenebeck err = s->ops->lstat(&s->ctx, &dpath, &fidst); 18118d6cb100SChristian Schoenebeck if (err < 0) { 18128d6cb100SChristian Schoenebeck err = -errno; 18138d6cb100SChristian Schoenebeck break; 18148d6cb100SChristian Schoenebeck } 18158d6cb100SChristian Schoenebeck stbuf = fidst; 181660ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 18178d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18188d6cb100SChristian Schoenebeck err = -EINTR; 18198d6cb100SChristian Schoenebeck break; 18208d6cb100SChristian Schoenebeck } 1821f22cad42SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18228d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18238d6cb100SChristian Schoenebeck { 18248d6cb100SChristian Schoenebeck err = s->ops->name_to_path(&s->ctx, &dpath, 182597b1d8fdSChristian Schoenebeck wnames[name_idx].data, 182697b1d8fdSChristian Schoenebeck &pathes[name_idx]); 18278d6cb100SChristian Schoenebeck if (err < 0) { 18288d6cb100SChristian Schoenebeck err = -errno; 18298d6cb100SChristian Schoenebeck break; 18308d6cb100SChristian Schoenebeck } 18318d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18328d6cb100SChristian Schoenebeck err = -EINTR; 18338d6cb100SChristian Schoenebeck break; 18348d6cb100SChristian Schoenebeck } 183597b1d8fdSChristian Schoenebeck err = s->ops->lstat(&s->ctx, &pathes[name_idx], &stbuf); 18368d6cb100SChristian Schoenebeck if (err < 0) { 18378d6cb100SChristian Schoenebeck err = -errno; 18388d6cb100SChristian Schoenebeck break; 18398d6cb100SChristian Schoenebeck } 18408d6cb100SChristian Schoenebeck stbufs[name_idx] = stbuf; 184197b1d8fdSChristian Schoenebeck v9fs_path_copy(&dpath, &pathes[name_idx]); 18428d6cb100SChristian Schoenebeck } 18438d6cb100SChristian Schoenebeck } 18448d6cb100SChristian Schoenebeck }); 18458d6cb100SChristian Schoenebeck /* 18468d6cb100SChristian Schoenebeck * Handle all the rest of this Twalk request on main thread ... 18478d6cb100SChristian Schoenebeck */ 184860ce86c7SWei Liu if (err < 0) { 184960ce86c7SWei Liu goto out; 185060ce86c7SWei Liu } 185156f101ecSGreg Kurz 18528d6cb100SChristian Schoenebeck err = stat_to_qid(pdu, &fidst, &qid); 185360ce86c7SWei Liu if (err < 0) { 185460ce86c7SWei Liu goto out; 185560ce86c7SWei Liu } 18568d6cb100SChristian Schoenebeck stbuf = fidst; 18578d6cb100SChristian Schoenebeck 18588d6cb100SChristian Schoenebeck /* reset dpath and path */ 18598d6cb100SChristian Schoenebeck v9fs_path_copy(&dpath, &fidp->path); 18608d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &fidp->path); 18618d6cb100SChristian Schoenebeck 18628d6cb100SChristian Schoenebeck for (name_idx = 0; name_idx < nwnames; name_idx++) { 18638d6cb100SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18648d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18658d6cb100SChristian Schoenebeck { 18668d6cb100SChristian Schoenebeck stbuf = stbufs[name_idx]; 18673b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18683b5ee9e8SAntonios Motakis if (err < 0) { 18693b5ee9e8SAntonios Motakis goto out; 18703b5ee9e8SAntonios Motakis } 18718d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &pathes[name_idx]); 187260ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 187360ce86c7SWei Liu } 187456f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 187556f101ecSGreg Kurz } 187660ce86c7SWei Liu if (fid == newfid) { 187749dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 187849dd946bSGreg Kurz err = -EINVAL; 187949dd946bSGreg Kurz goto out; 188049dd946bSGreg Kurz } 18815b3c77aaSGreg Kurz v9fs_path_write_lock(s); 188260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 18835b3c77aaSGreg Kurz v9fs_path_unlock(s); 188460ce86c7SWei Liu } else { 188560ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 188660ce86c7SWei Liu if (newfidp == NULL) { 188760ce86c7SWei Liu err = -EINVAL; 188860ce86c7SWei Liu goto out; 188960ce86c7SWei Liu } 189060ce86c7SWei Liu newfidp->uid = fidp->uid; 189160ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 189260ce86c7SWei Liu } 189360ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 189460ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 189560ce86c7SWei Liu out: 189660ce86c7SWei Liu put_fid(pdu, fidp); 189760ce86c7SWei Liu if (newfidp) { 189860ce86c7SWei Liu put_fid(pdu, newfidp); 189960ce86c7SWei Liu } 190060ce86c7SWei Liu v9fs_path_free(&dpath); 190160ce86c7SWei Liu v9fs_path_free(&path); 190260ce86c7SWei Liu out_nofid: 190360ce86c7SWei Liu pdu_complete(pdu, err); 190460ce86c7SWei Liu } 190560ce86c7SWei Liu 19068440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 190760ce86c7SWei Liu { 190860ce86c7SWei Liu struct statfs stbuf; 1909b565bccbSChristian Schoenebeck int err = v9fs_co_statfs(pdu, path, &stbuf); 191060ce86c7SWei Liu 1911b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, (err >= 0) ? stbuf.f_bsize : 0); 191260ce86c7SWei Liu } 191360ce86c7SWei Liu 19148440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 191560ce86c7SWei Liu { 191660ce86c7SWei Liu int flags; 191760ce86c7SWei Liu int32_t fid; 191860ce86c7SWei Liu int32_t mode; 191960ce86c7SWei Liu V9fsQID qid; 192060ce86c7SWei Liu int iounit = 0; 192160ce86c7SWei Liu ssize_t err = 0; 192260ce86c7SWei Liu size_t offset = 7; 192360ce86c7SWei Liu struct stat stbuf; 192460ce86c7SWei Liu V9fsFidState *fidp; 192560ce86c7SWei Liu V9fsPDU *pdu = opaque; 192660ce86c7SWei Liu V9fsState *s = pdu->s; 192760ce86c7SWei Liu 192860ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 192960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 193060ce86c7SWei Liu } else { 193160ce86c7SWei Liu uint8_t modebyte; 193260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 193360ce86c7SWei Liu mode = modebyte; 193460ce86c7SWei Liu } 193560ce86c7SWei Liu if (err < 0) { 193660ce86c7SWei Liu goto out_nofid; 193760ce86c7SWei Liu } 193860ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 193960ce86c7SWei Liu 194060ce86c7SWei Liu fidp = get_fid(pdu, fid); 194160ce86c7SWei Liu if (fidp == NULL) { 194260ce86c7SWei Liu err = -ENOENT; 194360ce86c7SWei Liu goto out_nofid; 194460ce86c7SWei Liu } 194549dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 194649dd946bSGreg Kurz err = -EINVAL; 194749dd946bSGreg Kurz goto out; 194849dd946bSGreg Kurz } 194960ce86c7SWei Liu 195060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 195160ce86c7SWei Liu if (err < 0) { 195260ce86c7SWei Liu goto out; 195360ce86c7SWei Liu } 19543b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19553b5ee9e8SAntonios Motakis if (err < 0) { 19563b5ee9e8SAntonios Motakis goto out; 19573b5ee9e8SAntonios Motakis } 195860ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 195960ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 196060ce86c7SWei Liu if (err < 0) { 196160ce86c7SWei Liu goto out; 196260ce86c7SWei Liu } 196360ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 196460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 196560ce86c7SWei Liu if (err < 0) { 196660ce86c7SWei Liu goto out; 196760ce86c7SWei Liu } 196860ce86c7SWei Liu err += offset; 196960ce86c7SWei Liu } else { 197060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 197160ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 197260ce86c7SWei Liu } else { 197360ce86c7SWei Liu flags = omode_to_uflags(mode); 197460ce86c7SWei Liu } 197560ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 197660ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 197760ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 197860ce86c7SWei Liu err = -EROFS; 197960ce86c7SWei Liu goto out; 198060ce86c7SWei Liu } 198160ce86c7SWei Liu } 198260ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 198360ce86c7SWei Liu if (err < 0) { 198460ce86c7SWei Liu goto out; 198560ce86c7SWei Liu } 198660ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 198760ce86c7SWei Liu fidp->open_flags = flags; 198860ce86c7SWei Liu if (flags & O_EXCL) { 198960ce86c7SWei Liu /* 199060ce86c7SWei Liu * We let the host file system do O_EXCL check 199160ce86c7SWei Liu * We should not reclaim such fd 199260ce86c7SWei Liu */ 199360ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 199460ce86c7SWei Liu } 199560ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 199660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 199760ce86c7SWei Liu if (err < 0) { 199860ce86c7SWei Liu goto out; 199960ce86c7SWei Liu } 200060ce86c7SWei Liu err += offset; 200160ce86c7SWei Liu } 200260ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 200360ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 200460ce86c7SWei Liu out: 200560ce86c7SWei Liu put_fid(pdu, fidp); 200660ce86c7SWei Liu out_nofid: 200760ce86c7SWei Liu pdu_complete(pdu, err); 200860ce86c7SWei Liu } 200960ce86c7SWei Liu 20108440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 201160ce86c7SWei Liu { 201260ce86c7SWei Liu int32_t dfid, flags, mode; 201360ce86c7SWei Liu gid_t gid; 201460ce86c7SWei Liu ssize_t err = 0; 201560ce86c7SWei Liu ssize_t offset = 7; 201660ce86c7SWei Liu V9fsString name; 201760ce86c7SWei Liu V9fsFidState *fidp; 201860ce86c7SWei Liu struct stat stbuf; 201960ce86c7SWei Liu V9fsQID qid; 202060ce86c7SWei Liu int32_t iounit; 202160ce86c7SWei Liu V9fsPDU *pdu = opaque; 202260ce86c7SWei Liu 202360ce86c7SWei Liu v9fs_string_init(&name); 202460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 202560ce86c7SWei Liu &name, &flags, &mode, &gid); 202660ce86c7SWei Liu if (err < 0) { 202760ce86c7SWei Liu goto out_nofid; 202860ce86c7SWei Liu } 202960ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 203060ce86c7SWei Liu 2031fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2032fff39a7aSGreg Kurz err = -ENOENT; 2033fff39a7aSGreg Kurz goto out_nofid; 2034fff39a7aSGreg Kurz } 2035fff39a7aSGreg Kurz 2036805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2037805b5d98SGreg Kurz err = -EEXIST; 2038805b5d98SGreg Kurz goto out_nofid; 2039805b5d98SGreg Kurz } 2040805b5d98SGreg Kurz 204160ce86c7SWei Liu fidp = get_fid(pdu, dfid); 204260ce86c7SWei Liu if (fidp == NULL) { 204360ce86c7SWei Liu err = -ENOENT; 204460ce86c7SWei Liu goto out_nofid; 204560ce86c7SWei Liu } 2046d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2047d63fb193SLi Qiang err = -EINVAL; 2048d63fb193SLi Qiang goto out; 2049d63fb193SLi Qiang } 205060ce86c7SWei Liu 205160ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 205260ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 205360ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 205460ce86c7SWei Liu if (err < 0) { 205560ce86c7SWei Liu goto out; 205660ce86c7SWei Liu } 205760ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 205860ce86c7SWei Liu fidp->open_flags = flags; 205960ce86c7SWei Liu if (flags & O_EXCL) { 206060ce86c7SWei Liu /* 206160ce86c7SWei Liu * We let the host file system do O_EXCL check 206260ce86c7SWei Liu * We should not reclaim such fd 206360ce86c7SWei Liu */ 206460ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 206560ce86c7SWei Liu } 206660ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20673b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20683b5ee9e8SAntonios Motakis if (err < 0) { 20693b5ee9e8SAntonios Motakis goto out; 20703b5ee9e8SAntonios Motakis } 207160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 207260ce86c7SWei Liu if (err < 0) { 207360ce86c7SWei Liu goto out; 207460ce86c7SWei Liu } 207560ce86c7SWei Liu err += offset; 207660ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 207760ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 207860ce86c7SWei Liu out: 207960ce86c7SWei Liu put_fid(pdu, fidp); 208060ce86c7SWei Liu out_nofid: 208160ce86c7SWei Liu pdu_complete(pdu, err); 208260ce86c7SWei Liu v9fs_string_free(&name); 208360ce86c7SWei Liu } 208460ce86c7SWei Liu 2085a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 208660ce86c7SWei Liu { 208760ce86c7SWei Liu int err; 208860ce86c7SWei Liu int32_t fid; 208960ce86c7SWei Liu int datasync; 209060ce86c7SWei Liu size_t offset = 7; 209160ce86c7SWei Liu V9fsFidState *fidp; 209260ce86c7SWei Liu V9fsPDU *pdu = opaque; 209360ce86c7SWei Liu 209460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 209560ce86c7SWei Liu if (err < 0) { 209660ce86c7SWei Liu goto out_nofid; 209760ce86c7SWei Liu } 209860ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 209960ce86c7SWei Liu 210060ce86c7SWei Liu fidp = get_fid(pdu, fid); 210160ce86c7SWei Liu if (fidp == NULL) { 210260ce86c7SWei Liu err = -ENOENT; 210360ce86c7SWei Liu goto out_nofid; 210460ce86c7SWei Liu } 210560ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 210660ce86c7SWei Liu if (!err) { 210760ce86c7SWei Liu err = offset; 210860ce86c7SWei Liu } 210960ce86c7SWei Liu put_fid(pdu, fidp); 211060ce86c7SWei Liu out_nofid: 211160ce86c7SWei Liu pdu_complete(pdu, err); 211260ce86c7SWei Liu } 211360ce86c7SWei Liu 21148440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 211560ce86c7SWei Liu { 211660ce86c7SWei Liu int err; 211760ce86c7SWei Liu int32_t fid; 211860ce86c7SWei Liu size_t offset = 7; 211960ce86c7SWei Liu V9fsFidState *fidp; 212060ce86c7SWei Liu V9fsPDU *pdu = opaque; 212160ce86c7SWei Liu V9fsState *s = pdu->s; 212260ce86c7SWei Liu 212360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 212460ce86c7SWei Liu if (err < 0) { 212560ce86c7SWei Liu goto out_nofid; 212660ce86c7SWei Liu } 212760ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 212860ce86c7SWei Liu 212960ce86c7SWei Liu fidp = clunk_fid(s, fid); 213060ce86c7SWei Liu if (fidp == NULL) { 213160ce86c7SWei Liu err = -ENOENT; 213260ce86c7SWei Liu goto out_nofid; 213360ce86c7SWei Liu } 213460ce86c7SWei Liu /* 213560ce86c7SWei Liu * Bump the ref so that put_fid will 213660ce86c7SWei Liu * free the fid. 213760ce86c7SWei Liu */ 213860ce86c7SWei Liu fidp->ref++; 213960ce86c7SWei Liu err = put_fid(pdu, fidp); 214060ce86c7SWei Liu if (!err) { 214160ce86c7SWei Liu err = offset; 214260ce86c7SWei Liu } 214360ce86c7SWei Liu out_nofid: 214460ce86c7SWei Liu pdu_complete(pdu, err); 214560ce86c7SWei Liu } 214660ce86c7SWei Liu 2147bcb8998fSStefano Stabellini /* 2148bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2149bcb8998fSStefano Stabellini * 2150bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2151bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2152bcb8998fSStefano Stabellini * @size: number of bytes to include 2153bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2154bcb8998fSStefano Stabellini * 2155bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2156bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2157bcb8998fSStefano Stabellini */ 2158bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2159cf45183bSStefano Stabellini size_t skip, size_t size, 2160bcb8998fSStefano Stabellini bool is_write) 2161bcb8998fSStefano Stabellini { 2162bcb8998fSStefano Stabellini QEMUIOVector elem; 2163bcb8998fSStefano Stabellini struct iovec *iov; 2164bcb8998fSStefano Stabellini unsigned int niov; 2165bcb8998fSStefano Stabellini 216688da0b03SStefano Stabellini if (is_write) { 2167cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 216888da0b03SStefano Stabellini } else { 2169cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 217088da0b03SStefano Stabellini } 2171bcb8998fSStefano Stabellini 2172bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2173bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2174cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2175bcb8998fSStefano Stabellini } 2176bcb8998fSStefano Stabellini 217760ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 217860ce86c7SWei Liu uint64_t off, uint32_t max_count) 217960ce86c7SWei Liu { 218060ce86c7SWei Liu ssize_t err; 218160ce86c7SWei Liu size_t offset = 7; 2182cf45183bSStefano Stabellini uint64_t read_count; 2183bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 218460ce86c7SWei Liu 21857e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21867e55d65cSLi Qiang read_count = 0; 218716724a17SGreg Kurz } else { 2188cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2189cf45183bSStefano Stabellini } 2190cf45183bSStefano Stabellini if (read_count > max_count) { 219160ce86c7SWei Liu read_count = max_count; 219260ce86c7SWei Liu } 219360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 219460ce86c7SWei Liu if (err < 0) { 219560ce86c7SWei Liu return err; 219660ce86c7SWei Liu } 219760ce86c7SWei Liu offset += err; 219800588a0aSWei Liu 2199cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2200fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 220160ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 220260ce86c7SWei Liu read_count); 2203bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 220460ce86c7SWei Liu if (err < 0) { 220560ce86c7SWei Liu return err; 220660ce86c7SWei Liu } 220760ce86c7SWei Liu offset += err; 220860ce86c7SWei Liu return offset; 220960ce86c7SWei Liu } 221060ce86c7SWei Liu 22118440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 22128440e22eSGreg Kurz V9fsFidState *fidp, 22138440e22eSGreg Kurz uint32_t max_count) 221460ce86c7SWei Liu { 221560ce86c7SWei Liu V9fsPath path; 221660ce86c7SWei Liu V9fsStat v9stat; 221760ce86c7SWei Liu int len, err = 0; 221860ce86c7SWei Liu int32_t count = 0; 221960ce86c7SWei Liu struct stat stbuf; 222060ce86c7SWei Liu off_t saved_dir_pos; 2221635324e8SGreg Kurz struct dirent *dent; 222260ce86c7SWei Liu 222360ce86c7SWei Liu /* save the directory position */ 222460ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 222560ce86c7SWei Liu if (saved_dir_pos < 0) { 222660ce86c7SWei Liu return saved_dir_pos; 222760ce86c7SWei Liu } 222860ce86c7SWei Liu 222960ce86c7SWei Liu while (1) { 223060ce86c7SWei Liu v9fs_path_init(&path); 22317cde47d4SGreg Kurz 22327cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 22337cde47d4SGreg Kurz 2234635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2235635324e8SGreg Kurz if (err || !dent) { 223660ce86c7SWei Liu break; 223760ce86c7SWei Liu } 223860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 223960ce86c7SWei Liu if (err < 0) { 22408762a46dSGreg Kurz break; 224160ce86c7SWei Liu } 224260ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 224360ce86c7SWei Liu if (err < 0) { 22448762a46dSGreg Kurz break; 224560ce86c7SWei Liu } 22466069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 224760ce86c7SWei Liu if (err < 0) { 22488762a46dSGreg Kurz break; 224960ce86c7SWei Liu } 2250772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 22517cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22527cde47d4SGreg Kurz 225360ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 225460ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 225560ce86c7SWei Liu v9fs_stat_free(&v9stat); 225660ce86c7SWei Liu v9fs_path_free(&path); 225760ce86c7SWei Liu return count; 225860ce86c7SWei Liu } 2259772a7369SJan Dakinevich 2260772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2261772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2262772a7369SJan Dakinevich 2263772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2264772a7369SJan Dakinevich 2265772a7369SJan Dakinevich if (len < 0) { 2266772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2267772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2268772a7369SJan Dakinevich v9fs_path_free(&path); 2269772a7369SJan Dakinevich return len; 2270772a7369SJan Dakinevich } 227160ce86c7SWei Liu count += len; 227260ce86c7SWei Liu v9fs_stat_free(&v9stat); 227360ce86c7SWei Liu v9fs_path_free(&path); 227460ce86c7SWei Liu saved_dir_pos = dent->d_off; 227560ce86c7SWei Liu } 22768762a46dSGreg Kurz 22777cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22787cde47d4SGreg Kurz 227960ce86c7SWei Liu v9fs_path_free(&path); 228060ce86c7SWei Liu if (err < 0) { 228160ce86c7SWei Liu return err; 228260ce86c7SWei Liu } 228360ce86c7SWei Liu return count; 228460ce86c7SWei Liu } 228560ce86c7SWei Liu 22868440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 228760ce86c7SWei Liu { 228860ce86c7SWei Liu int32_t fid; 228960ce86c7SWei Liu uint64_t off; 229060ce86c7SWei Liu ssize_t err = 0; 229160ce86c7SWei Liu int32_t count = 0; 229260ce86c7SWei Liu size_t offset = 7; 229360ce86c7SWei Liu uint32_t max_count; 229460ce86c7SWei Liu V9fsFidState *fidp; 229560ce86c7SWei Liu V9fsPDU *pdu = opaque; 229660ce86c7SWei Liu V9fsState *s = pdu->s; 229760ce86c7SWei Liu 229860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 229960ce86c7SWei Liu if (err < 0) { 230060ce86c7SWei Liu goto out_nofid; 230160ce86c7SWei Liu } 230260ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 230360ce86c7SWei Liu 230460ce86c7SWei Liu fidp = get_fid(pdu, fid); 230560ce86c7SWei Liu if (fidp == NULL) { 230660ce86c7SWei Liu err = -EINVAL; 230760ce86c7SWei Liu goto out_nofid; 230860ce86c7SWei Liu } 230960ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2310d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2311d2c5cf7cSChristian Schoenebeck warn_report_once( 2312d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2313d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2314d2c5cf7cSChristian Schoenebeck ); 2315d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2316d2c5cf7cSChristian Schoenebeck goto out; 2317d2c5cf7cSChristian Schoenebeck } 231860ce86c7SWei Liu if (off == 0) { 231960ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 232060ce86c7SWei Liu } 232160ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 232260ce86c7SWei Liu if (count < 0) { 232360ce86c7SWei Liu err = count; 232460ce86c7SWei Liu goto out; 232560ce86c7SWei Liu } 232660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 232760ce86c7SWei Liu if (err < 0) { 232860ce86c7SWei Liu goto out; 232960ce86c7SWei Liu } 233060ce86c7SWei Liu err += offset + count; 233160ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 233260ce86c7SWei Liu QEMUIOVector qiov_full; 233360ce86c7SWei Liu QEMUIOVector qiov; 233460ce86c7SWei Liu int32_t len; 233560ce86c7SWei Liu 2336cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 233760ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 233860ce86c7SWei Liu do { 233960ce86c7SWei Liu qemu_iovec_reset(&qiov); 234060ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 234160ce86c7SWei Liu if (0) { 234260ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 234360ce86c7SWei Liu } 234460ce86c7SWei Liu /* Loop in case of EINTR */ 234560ce86c7SWei Liu do { 234660ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 234760ce86c7SWei Liu if (len >= 0) { 234860ce86c7SWei Liu off += len; 234960ce86c7SWei Liu count += len; 235060ce86c7SWei Liu } 235160ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 235260ce86c7SWei Liu if (len < 0) { 235360ce86c7SWei Liu /* IO error return the error */ 235460ce86c7SWei Liu err = len; 2355e95c9a49SLi Qiang goto out_free_iovec; 235660ce86c7SWei Liu } 235760ce86c7SWei Liu } while (count < max_count && len > 0); 235860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 235960ce86c7SWei Liu if (err < 0) { 2360e95c9a49SLi Qiang goto out_free_iovec; 236160ce86c7SWei Liu } 236260ce86c7SWei Liu err += offset + count; 2363e95c9a49SLi Qiang out_free_iovec: 236460ce86c7SWei Liu qemu_iovec_destroy(&qiov); 236560ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 236660ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 236760ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 236860ce86c7SWei Liu } else { 236960ce86c7SWei Liu err = -EINVAL; 237060ce86c7SWei Liu } 237160ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 237260ce86c7SWei Liu out: 237360ce86c7SWei Liu put_fid(pdu, fidp); 237460ce86c7SWei Liu out_nofid: 237560ce86c7SWei Liu pdu_complete(pdu, err); 237660ce86c7SWei Liu } 237760ce86c7SWei Liu 237829c9d2caSChristian Schoenebeck /** 237929c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 238029c9d2caSChristian Schoenebeck * 238129c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 238229c9d2caSChristian Schoenebeck * @returns required size in bytes 238329c9d2caSChristian Schoenebeck */ 238429c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 238560ce86c7SWei Liu { 238660ce86c7SWei Liu /* 238760ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 238860ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 238960ce86c7SWei Liu */ 239060ce86c7SWei Liu return 24 + v9fs_string_size(name); 239160ce86c7SWei Liu } 239260ce86c7SWei Liu 23930c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 23940c4356baSChristian Schoenebeck { 23950c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 23960c4356baSChristian Schoenebeck 23970c4356baSChristian Schoenebeck for (; e; e = next) { 23980c4356baSChristian Schoenebeck next = e->next; 23990c4356baSChristian Schoenebeck g_free(e->dent); 24000c4356baSChristian Schoenebeck g_free(e->st); 24010c4356baSChristian Schoenebeck g_free(e); 24020c4356baSChristian Schoenebeck } 24030c4356baSChristian Schoenebeck } 24040c4356baSChristian Schoenebeck 24058440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 24060c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 240760ce86c7SWei Liu { 240860ce86c7SWei Liu size_t size; 240960ce86c7SWei Liu V9fsQID qid; 241060ce86c7SWei Liu V9fsString name; 241160ce86c7SWei Liu int len, err = 0; 241260ce86c7SWei Liu int32_t count = 0; 2413635324e8SGreg Kurz struct dirent *dent; 24140c4356baSChristian Schoenebeck struct stat *st; 24150c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 241660ce86c7SWei Liu 24170c4356baSChristian Schoenebeck /* 24180c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 24190c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 24200c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 24210c4356baSChristian Schoenebeck */ 24220c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 24230c4356baSChristian Schoenebeck 24240c4356baSChristian Schoenebeck /* 24250c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 24260c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 24270c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 24280c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 24290c4356baSChristian Schoenebeck */ 24300c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 24310c4356baSChristian Schoenebeck dostat); 24320c4356baSChristian Schoenebeck if (count < 0) { 24330c4356baSChristian Schoenebeck err = count; 24340c4356baSChristian Schoenebeck count = 0; 24350c4356baSChristian Schoenebeck goto out; 243660ce86c7SWei Liu } 24370c4356baSChristian Schoenebeck count = 0; 243860ce86c7SWei Liu 24390c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 24400c4356baSChristian Schoenebeck dent = e->dent; 24411a6ed33cSAntonios Motakis 24421a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 24430c4356baSChristian Schoenebeck st = e->st; 24440c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 24450c4356baSChristian Schoenebeck if (!st) { 24460c4356baSChristian Schoenebeck err = -1; 24470c4356baSChristian Schoenebeck break; 24480c4356baSChristian Schoenebeck } 24490c4356baSChristian Schoenebeck 24500c4356baSChristian Schoenebeck /* remap inode */ 24510c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 24521a6ed33cSAntonios Motakis if (err < 0) { 24530c4356baSChristian Schoenebeck break; 24541a6ed33cSAntonios Motakis } 24551a6ed33cSAntonios Motakis } else { 245660ce86c7SWei Liu /* 245760ce86c7SWei Liu * Fill up just the path field of qid because the client uses 245860ce86c7SWei Liu * only that. To fill the entire qid structure we will have 24591a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 24600c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 24611a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 24621a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 24631a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 24641a6ed33cSAntonios Motakis * files/dirs through other ways. 246560ce86c7SWei Liu */ 246660ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 246760ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 246860ce86c7SWei Liu /* Fill the other fields with dummy values */ 246960ce86c7SWei Liu qid.type = 0; 247060ce86c7SWei Liu qid.version = 0; 24711a6ed33cSAntonios Motakis } 247260ce86c7SWei Liu 24730c4356baSChristian Schoenebeck v9fs_string_init(&name); 24740c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24750c4356baSChristian Schoenebeck 247660ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 247760ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 247860ce86c7SWei Liu &qid, dent->d_off, 247960ce86c7SWei Liu dent->d_type, &name); 24807cde47d4SGreg Kurz 24810c4356baSChristian Schoenebeck v9fs_string_free(&name); 24827cde47d4SGreg Kurz 248360ce86c7SWei Liu if (len < 0) { 24840c4356baSChristian Schoenebeck err = len; 24850c4356baSChristian Schoenebeck break; 248660ce86c7SWei Liu } 24870c4356baSChristian Schoenebeck 248860ce86c7SWei Liu count += len; 248960ce86c7SWei Liu } 24907cde47d4SGreg Kurz 24910c4356baSChristian Schoenebeck out: 24920c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 249360ce86c7SWei Liu if (err < 0) { 249460ce86c7SWei Liu return err; 249560ce86c7SWei Liu } 249660ce86c7SWei Liu return count; 249760ce86c7SWei Liu } 249860ce86c7SWei Liu 24998440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 250060ce86c7SWei Liu { 250160ce86c7SWei Liu int32_t fid; 250260ce86c7SWei Liu V9fsFidState *fidp; 250360ce86c7SWei Liu ssize_t retval = 0; 250460ce86c7SWei Liu size_t offset = 7; 250560ce86c7SWei Liu uint64_t initial_offset; 250660ce86c7SWei Liu int32_t count; 250760ce86c7SWei Liu uint32_t max_count; 250860ce86c7SWei Liu V9fsPDU *pdu = opaque; 2509d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 251060ce86c7SWei Liu 251160ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 251260ce86c7SWei Liu &initial_offset, &max_count); 251360ce86c7SWei Liu if (retval < 0) { 251460ce86c7SWei Liu goto out_nofid; 251560ce86c7SWei Liu } 251660ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 251760ce86c7SWei Liu 2518d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2519d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2520d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2521d36a5c22SChristian Schoenebeck warn_report_once( 2522d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2523d36a5c22SChristian Schoenebeck ); 2524d36a5c22SChristian Schoenebeck } 2525d36a5c22SChristian Schoenebeck 252660ce86c7SWei Liu fidp = get_fid(pdu, fid); 252760ce86c7SWei Liu if (fidp == NULL) { 252860ce86c7SWei Liu retval = -EINVAL; 252960ce86c7SWei Liu goto out_nofid; 253060ce86c7SWei Liu } 2531f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 253260ce86c7SWei Liu retval = -EINVAL; 253360ce86c7SWei Liu goto out; 253460ce86c7SWei Liu } 2535d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2536d2c5cf7cSChristian Schoenebeck warn_report_once( 2537d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2538d2c5cf7cSChristian Schoenebeck "protocol version" 2539d2c5cf7cSChristian Schoenebeck ); 2540d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2541d2c5cf7cSChristian Schoenebeck goto out; 2542d2c5cf7cSChristian Schoenebeck } 25430c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 254460ce86c7SWei Liu if (count < 0) { 254560ce86c7SWei Liu retval = count; 254660ce86c7SWei Liu goto out; 254760ce86c7SWei Liu } 254860ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 254960ce86c7SWei Liu if (retval < 0) { 255060ce86c7SWei Liu goto out; 255160ce86c7SWei Liu } 255260ce86c7SWei Liu retval += count + offset; 255360ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 255460ce86c7SWei Liu out: 255560ce86c7SWei Liu put_fid(pdu, fidp); 255660ce86c7SWei Liu out_nofid: 255760ce86c7SWei Liu pdu_complete(pdu, retval); 255860ce86c7SWei Liu } 255960ce86c7SWei Liu 256060ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 256160ce86c7SWei Liu uint64_t off, uint32_t count, 256260ce86c7SWei Liu struct iovec *sg, int cnt) 256360ce86c7SWei Liu { 256460ce86c7SWei Liu int i, to_copy; 256560ce86c7SWei Liu ssize_t err = 0; 25667e55d65cSLi Qiang uint64_t write_count; 256760ce86c7SWei Liu size_t offset = 7; 256860ce86c7SWei Liu 256960ce86c7SWei Liu 25707e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2571b858e80aSDaniel Henrique Barboza return -ENOSPC; 257260ce86c7SWei Liu } 25737e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 25747e55d65cSLi Qiang if (write_count > count) { 25757e55d65cSLi Qiang write_count = count; 25767e55d65cSLi Qiang } 257760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 257860ce86c7SWei Liu if (err < 0) { 257960ce86c7SWei Liu return err; 258060ce86c7SWei Liu } 258160ce86c7SWei Liu err += offset; 258260ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 258360ce86c7SWei Liu /* 258460ce86c7SWei Liu * Now copy the content from sg list 258560ce86c7SWei Liu */ 258660ce86c7SWei Liu for (i = 0; i < cnt; i++) { 258760ce86c7SWei Liu if (write_count > sg[i].iov_len) { 258860ce86c7SWei Liu to_copy = sg[i].iov_len; 258960ce86c7SWei Liu } else { 259060ce86c7SWei Liu to_copy = write_count; 259160ce86c7SWei Liu } 259260ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 259360ce86c7SWei Liu /* updating vs->off since we are not using below */ 259460ce86c7SWei Liu off += to_copy; 259560ce86c7SWei Liu write_count -= to_copy; 259660ce86c7SWei Liu } 2597b858e80aSDaniel Henrique Barboza 259860ce86c7SWei Liu return err; 259960ce86c7SWei Liu } 260060ce86c7SWei Liu 26018440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 260260ce86c7SWei Liu { 260360ce86c7SWei Liu ssize_t err; 260460ce86c7SWei Liu int32_t fid; 260560ce86c7SWei Liu uint64_t off; 260660ce86c7SWei Liu uint32_t count; 260760ce86c7SWei Liu int32_t len = 0; 260860ce86c7SWei Liu int32_t total = 0; 260960ce86c7SWei Liu size_t offset = 7; 261060ce86c7SWei Liu V9fsFidState *fidp; 261160ce86c7SWei Liu V9fsPDU *pdu = opaque; 261260ce86c7SWei Liu V9fsState *s = pdu->s; 261360ce86c7SWei Liu QEMUIOVector qiov_full; 261460ce86c7SWei Liu QEMUIOVector qiov; 261560ce86c7SWei Liu 261660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 261760ce86c7SWei Liu if (err < 0) { 261860ce86c7SWei Liu pdu_complete(pdu, err); 261960ce86c7SWei Liu return; 262060ce86c7SWei Liu } 262160ce86c7SWei Liu offset += err; 2622cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 262360ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 262460ce86c7SWei Liu 262560ce86c7SWei Liu fidp = get_fid(pdu, fid); 262660ce86c7SWei Liu if (fidp == NULL) { 262760ce86c7SWei Liu err = -EINVAL; 262860ce86c7SWei Liu goto out_nofid; 262960ce86c7SWei Liu } 263060ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 263160ce86c7SWei Liu if (fidp->fs.fd == -1) { 263260ce86c7SWei Liu err = -EINVAL; 263360ce86c7SWei Liu goto out; 263460ce86c7SWei Liu } 263560ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 263660ce86c7SWei Liu /* 263760ce86c7SWei Liu * setxattr operation 263860ce86c7SWei Liu */ 263960ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 264060ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 264160ce86c7SWei Liu goto out; 264260ce86c7SWei Liu } else { 264360ce86c7SWei Liu err = -EINVAL; 264460ce86c7SWei Liu goto out; 264560ce86c7SWei Liu } 264660ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 264760ce86c7SWei Liu do { 264860ce86c7SWei Liu qemu_iovec_reset(&qiov); 264960ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 265060ce86c7SWei Liu if (0) { 265160ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 265260ce86c7SWei Liu } 265360ce86c7SWei Liu /* Loop in case of EINTR */ 265460ce86c7SWei Liu do { 265560ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 265660ce86c7SWei Liu if (len >= 0) { 265760ce86c7SWei Liu off += len; 265860ce86c7SWei Liu total += len; 265960ce86c7SWei Liu } 266060ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 266160ce86c7SWei Liu if (len < 0) { 266260ce86c7SWei Liu /* IO error return the error */ 266360ce86c7SWei Liu err = len; 266460ce86c7SWei Liu goto out_qiov; 266560ce86c7SWei Liu } 266660ce86c7SWei Liu } while (total < count && len > 0); 266760ce86c7SWei Liu 266860ce86c7SWei Liu offset = 7; 266960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 267060ce86c7SWei Liu if (err < 0) { 2671fdfcc9aeSLi Qiang goto out_qiov; 267260ce86c7SWei Liu } 267360ce86c7SWei Liu err += offset; 267460ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 267560ce86c7SWei Liu out_qiov: 267660ce86c7SWei Liu qemu_iovec_destroy(&qiov); 267760ce86c7SWei Liu out: 267860ce86c7SWei Liu put_fid(pdu, fidp); 267960ce86c7SWei Liu out_nofid: 268060ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 268160ce86c7SWei Liu pdu_complete(pdu, err); 268260ce86c7SWei Liu } 268360ce86c7SWei Liu 26848440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 268560ce86c7SWei Liu { 268660ce86c7SWei Liu int32_t fid; 268760ce86c7SWei Liu int err = 0; 268860ce86c7SWei Liu size_t offset = 7; 268960ce86c7SWei Liu V9fsFidState *fidp; 269060ce86c7SWei Liu V9fsQID qid; 269160ce86c7SWei Liu int32_t perm; 269260ce86c7SWei Liu int8_t mode; 269360ce86c7SWei Liu V9fsPath path; 269460ce86c7SWei Liu struct stat stbuf; 269560ce86c7SWei Liu V9fsString name; 269660ce86c7SWei Liu V9fsString extension; 269760ce86c7SWei Liu int iounit; 269860ce86c7SWei Liu V9fsPDU *pdu = opaque; 26995b3c77aaSGreg Kurz V9fsState *s = pdu->s; 270060ce86c7SWei Liu 270160ce86c7SWei Liu v9fs_path_init(&path); 270260ce86c7SWei Liu v9fs_string_init(&name); 270360ce86c7SWei Liu v9fs_string_init(&extension); 270460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 270560ce86c7SWei Liu &perm, &mode, &extension); 270660ce86c7SWei Liu if (err < 0) { 270760ce86c7SWei Liu goto out_nofid; 270860ce86c7SWei Liu } 270960ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 271060ce86c7SWei Liu 2711fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2712fff39a7aSGreg Kurz err = -ENOENT; 2713fff39a7aSGreg Kurz goto out_nofid; 2714fff39a7aSGreg Kurz } 2715fff39a7aSGreg Kurz 2716805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2717805b5d98SGreg Kurz err = -EEXIST; 2718805b5d98SGreg Kurz goto out_nofid; 2719805b5d98SGreg Kurz } 2720805b5d98SGreg Kurz 272160ce86c7SWei Liu fidp = get_fid(pdu, fid); 272260ce86c7SWei Liu if (fidp == NULL) { 272360ce86c7SWei Liu err = -EINVAL; 272460ce86c7SWei Liu goto out_nofid; 272560ce86c7SWei Liu } 2726d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2727d63fb193SLi Qiang err = -EINVAL; 2728d63fb193SLi Qiang goto out; 2729d63fb193SLi Qiang } 273060ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 273160ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 273260ce86c7SWei Liu fidp->uid, -1, &stbuf); 273360ce86c7SWei Liu if (err < 0) { 273460ce86c7SWei Liu goto out; 273560ce86c7SWei Liu } 273660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 273760ce86c7SWei Liu if (err < 0) { 273860ce86c7SWei Liu goto out; 273960ce86c7SWei Liu } 27405b3c77aaSGreg Kurz v9fs_path_write_lock(s); 274160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27425b3c77aaSGreg Kurz v9fs_path_unlock(s); 274360ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 274460ce86c7SWei Liu if (err < 0) { 274560ce86c7SWei Liu goto out; 274660ce86c7SWei Liu } 274760ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 274860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 274960ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 275060ce86c7SWei Liu extension.data, -1 , &stbuf); 275160ce86c7SWei Liu if (err < 0) { 275260ce86c7SWei Liu goto out; 275360ce86c7SWei Liu } 275460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 275560ce86c7SWei Liu if (err < 0) { 275660ce86c7SWei Liu goto out; 275760ce86c7SWei Liu } 27585b3c77aaSGreg Kurz v9fs_path_write_lock(s); 275960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27605b3c77aaSGreg Kurz v9fs_path_unlock(s); 276160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 276260ce86c7SWei Liu int32_t ofid = atoi(extension.data); 276360ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 276460ce86c7SWei Liu if (ofidp == NULL) { 276560ce86c7SWei Liu err = -EINVAL; 276660ce86c7SWei Liu goto out; 276760ce86c7SWei Liu } 276860ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 276960ce86c7SWei Liu put_fid(pdu, ofidp); 277060ce86c7SWei Liu if (err < 0) { 277160ce86c7SWei Liu goto out; 277260ce86c7SWei Liu } 277360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 277460ce86c7SWei Liu if (err < 0) { 277560ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 277660ce86c7SWei Liu goto out; 277760ce86c7SWei Liu } 27785b3c77aaSGreg Kurz v9fs_path_write_lock(s); 277960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27805b3c77aaSGreg Kurz v9fs_path_unlock(s); 278160ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 278260ce86c7SWei Liu if (err < 0) { 278360ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 278460ce86c7SWei Liu goto out; 278560ce86c7SWei Liu } 278660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 278760ce86c7SWei Liu char ctype; 278860ce86c7SWei Liu uint32_t major, minor; 278960ce86c7SWei Liu mode_t nmode = 0; 279060ce86c7SWei Liu 279160ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 279260ce86c7SWei Liu err = -errno; 279360ce86c7SWei Liu goto out; 279460ce86c7SWei Liu } 279560ce86c7SWei Liu 279660ce86c7SWei Liu switch (ctype) { 279760ce86c7SWei Liu case 'c': 279860ce86c7SWei Liu nmode = S_IFCHR; 279960ce86c7SWei Liu break; 280060ce86c7SWei Liu case 'b': 280160ce86c7SWei Liu nmode = S_IFBLK; 280260ce86c7SWei Liu break; 280360ce86c7SWei Liu default: 280460ce86c7SWei Liu err = -EIO; 280560ce86c7SWei Liu goto out; 280660ce86c7SWei Liu } 280760ce86c7SWei Liu 280860ce86c7SWei Liu nmode |= perm & 0777; 280960ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 281060ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 281160ce86c7SWei Liu if (err < 0) { 281260ce86c7SWei Liu goto out; 281360ce86c7SWei Liu } 281460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 281560ce86c7SWei Liu if (err < 0) { 281660ce86c7SWei Liu goto out; 281760ce86c7SWei Liu } 28185b3c77aaSGreg Kurz v9fs_path_write_lock(s); 281960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28205b3c77aaSGreg Kurz v9fs_path_unlock(s); 282160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 282260ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 282360ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &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_SOCKET) { 283560ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 283660ce86c7SWei Liu 0, S_IFSOCK | (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 { 284860ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 284960ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 285060ce86c7SWei Liu if (err < 0) { 285160ce86c7SWei Liu goto out; 285260ce86c7SWei Liu } 285360ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 285460ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 285560ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 285660ce86c7SWei Liu /* 285760ce86c7SWei Liu * We let the host file system do O_EXCL check 285860ce86c7SWei Liu * We should not reclaim such fd 285960ce86c7SWei Liu */ 286060ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 286160ce86c7SWei Liu } 286260ce86c7SWei Liu } 286360ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 28643b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28653b5ee9e8SAntonios Motakis if (err < 0) { 28663b5ee9e8SAntonios Motakis goto out; 28673b5ee9e8SAntonios Motakis } 286860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 286960ce86c7SWei Liu if (err < 0) { 287060ce86c7SWei Liu goto out; 287160ce86c7SWei Liu } 287260ce86c7SWei Liu err += offset; 287360ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 287460ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 287560ce86c7SWei Liu out: 287660ce86c7SWei Liu put_fid(pdu, fidp); 287760ce86c7SWei Liu out_nofid: 287860ce86c7SWei Liu pdu_complete(pdu, err); 287960ce86c7SWei Liu v9fs_string_free(&name); 288060ce86c7SWei Liu v9fs_string_free(&extension); 288160ce86c7SWei Liu v9fs_path_free(&path); 288260ce86c7SWei Liu } 288360ce86c7SWei Liu 28848440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 288560ce86c7SWei Liu { 288660ce86c7SWei Liu V9fsPDU *pdu = opaque; 288760ce86c7SWei Liu V9fsString name; 288860ce86c7SWei Liu V9fsString symname; 288960ce86c7SWei Liu V9fsFidState *dfidp; 289060ce86c7SWei Liu V9fsQID qid; 289160ce86c7SWei Liu struct stat stbuf; 289260ce86c7SWei Liu int32_t dfid; 289360ce86c7SWei Liu int err = 0; 289460ce86c7SWei Liu gid_t gid; 289560ce86c7SWei Liu size_t offset = 7; 289660ce86c7SWei Liu 289760ce86c7SWei Liu v9fs_string_init(&name); 289860ce86c7SWei Liu v9fs_string_init(&symname); 289960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 290060ce86c7SWei Liu if (err < 0) { 290160ce86c7SWei Liu goto out_nofid; 290260ce86c7SWei Liu } 290360ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 290460ce86c7SWei Liu 2905fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2906fff39a7aSGreg Kurz err = -ENOENT; 2907fff39a7aSGreg Kurz goto out_nofid; 2908fff39a7aSGreg Kurz } 2909fff39a7aSGreg Kurz 2910805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2911805b5d98SGreg Kurz err = -EEXIST; 2912805b5d98SGreg Kurz goto out_nofid; 2913805b5d98SGreg Kurz } 2914805b5d98SGreg Kurz 291560ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 291660ce86c7SWei Liu if (dfidp == NULL) { 291760ce86c7SWei Liu err = -EINVAL; 291860ce86c7SWei Liu goto out_nofid; 291960ce86c7SWei Liu } 292060ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 292160ce86c7SWei Liu if (err < 0) { 292260ce86c7SWei Liu goto out; 292360ce86c7SWei Liu } 29243b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 29253b5ee9e8SAntonios Motakis if (err < 0) { 29263b5ee9e8SAntonios Motakis goto out; 29273b5ee9e8SAntonios Motakis } 292860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 292960ce86c7SWei Liu if (err < 0) { 293060ce86c7SWei Liu goto out; 293160ce86c7SWei Liu } 293260ce86c7SWei Liu err += offset; 293360ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 293460ce86c7SWei Liu qid.type, qid.version, qid.path); 293560ce86c7SWei Liu out: 293660ce86c7SWei Liu put_fid(pdu, dfidp); 293760ce86c7SWei Liu out_nofid: 293860ce86c7SWei Liu pdu_complete(pdu, err); 293960ce86c7SWei Liu v9fs_string_free(&name); 294060ce86c7SWei Liu v9fs_string_free(&symname); 294160ce86c7SWei Liu } 294260ce86c7SWei Liu 2943a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 294460ce86c7SWei Liu { 294560ce86c7SWei Liu ssize_t err; 294660ce86c7SWei Liu int16_t tag; 294760ce86c7SWei Liu size_t offset = 7; 2948d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 294960ce86c7SWei Liu V9fsPDU *pdu = opaque; 295060ce86c7SWei Liu V9fsState *s = pdu->s; 295160ce86c7SWei Liu 295260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 295360ce86c7SWei Liu if (err < 0) { 295460ce86c7SWei Liu pdu_complete(pdu, err); 295560ce86c7SWei Liu return; 295660ce86c7SWei Liu } 295760ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 295860ce86c7SWei Liu 2959d5f2af7bSGreg Kurz if (pdu->tag == tag) { 29603dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2961d5f2af7bSGreg Kurz } else { 296260ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 296360ce86c7SWei Liu if (cancel_pdu->tag == tag) { 296460ce86c7SWei Liu break; 296560ce86c7SWei Liu } 296660ce86c7SWei Liu } 2967d5f2af7bSGreg Kurz } 296860ce86c7SWei Liu if (cancel_pdu) { 296960ce86c7SWei Liu cancel_pdu->cancelled = 1; 297060ce86c7SWei Liu /* 297160ce86c7SWei Liu * Wait for pdu to complete. 297260ce86c7SWei Liu */ 29731ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 297418adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 297560ce86c7SWei Liu cancel_pdu->cancelled = 0; 297660ce86c7SWei Liu pdu_free(cancel_pdu); 297760ce86c7SWei Liu } 297818adde86SGreg Kurz } 297960ce86c7SWei Liu pdu_complete(pdu, 7); 298060ce86c7SWei Liu } 298160ce86c7SWei Liu 29828440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 298360ce86c7SWei Liu { 298460ce86c7SWei Liu V9fsPDU *pdu = opaque; 298560ce86c7SWei Liu int32_t dfid, oldfid; 298660ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 298760ce86c7SWei Liu V9fsString name; 298860ce86c7SWei Liu size_t offset = 7; 298960ce86c7SWei Liu int err = 0; 299060ce86c7SWei Liu 299160ce86c7SWei Liu v9fs_string_init(&name); 299260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 299360ce86c7SWei Liu if (err < 0) { 299460ce86c7SWei Liu goto out_nofid; 299560ce86c7SWei Liu } 299660ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 299760ce86c7SWei Liu 2998fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2999fff39a7aSGreg Kurz err = -ENOENT; 3000fff39a7aSGreg Kurz goto out_nofid; 3001fff39a7aSGreg Kurz } 3002fff39a7aSGreg Kurz 3003805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3004805b5d98SGreg Kurz err = -EEXIST; 3005805b5d98SGreg Kurz goto out_nofid; 3006805b5d98SGreg Kurz } 3007805b5d98SGreg Kurz 300860ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 300960ce86c7SWei Liu if (dfidp == NULL) { 301060ce86c7SWei Liu err = -ENOENT; 301160ce86c7SWei Liu goto out_nofid; 301260ce86c7SWei Liu } 301360ce86c7SWei Liu 301460ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 301560ce86c7SWei Liu if (oldfidp == NULL) { 301660ce86c7SWei Liu err = -ENOENT; 301760ce86c7SWei Liu goto out; 301860ce86c7SWei Liu } 301960ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 302060ce86c7SWei Liu if (!err) { 302160ce86c7SWei Liu err = offset; 302260ce86c7SWei Liu } 30234c158678SLi Qiang put_fid(pdu, oldfidp); 302460ce86c7SWei Liu out: 302560ce86c7SWei Liu put_fid(pdu, dfidp); 302660ce86c7SWei Liu out_nofid: 302760ce86c7SWei Liu v9fs_string_free(&name); 302860ce86c7SWei Liu pdu_complete(pdu, err); 302960ce86c7SWei Liu } 303060ce86c7SWei Liu 303160ce86c7SWei Liu /* Only works with path name based fid */ 30328440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 303360ce86c7SWei Liu { 303460ce86c7SWei Liu int32_t fid; 303560ce86c7SWei Liu int err = 0; 303660ce86c7SWei Liu size_t offset = 7; 303760ce86c7SWei Liu V9fsFidState *fidp; 303860ce86c7SWei Liu V9fsPDU *pdu = opaque; 303960ce86c7SWei Liu 304060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 304160ce86c7SWei Liu if (err < 0) { 304260ce86c7SWei Liu goto out_nofid; 304360ce86c7SWei Liu } 304460ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 304560ce86c7SWei Liu 304660ce86c7SWei Liu fidp = get_fid(pdu, fid); 304760ce86c7SWei Liu if (fidp == NULL) { 304860ce86c7SWei Liu err = -EINVAL; 304960ce86c7SWei Liu goto out_nofid; 305060ce86c7SWei Liu } 305160ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 305260ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 305360ce86c7SWei Liu err = -EOPNOTSUPP; 305460ce86c7SWei Liu goto out_err; 305560ce86c7SWei Liu } 305660ce86c7SWei Liu /* 305760ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 305860ce86c7SWei Liu * the file later. So don't reclaim fd 305960ce86c7SWei Liu */ 306060ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 306160ce86c7SWei Liu if (err < 0) { 306260ce86c7SWei Liu goto out_err; 306360ce86c7SWei Liu } 306460ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 306560ce86c7SWei Liu if (!err) { 306660ce86c7SWei Liu err = offset; 306760ce86c7SWei Liu } 306860ce86c7SWei Liu out_err: 306960ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 307060ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 307160ce86c7SWei Liu put_fid(pdu, fidp); 307260ce86c7SWei Liu out_nofid: 307360ce86c7SWei Liu pdu_complete(pdu, err); 307460ce86c7SWei Liu } 307560ce86c7SWei Liu 30768440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 307760ce86c7SWei Liu { 307860ce86c7SWei Liu int err = 0; 307960ce86c7SWei Liu V9fsString name; 308067e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 308160ce86c7SWei Liu size_t offset = 7; 308260ce86c7SWei Liu V9fsPath path; 308360ce86c7SWei Liu V9fsFidState *dfidp; 308460ce86c7SWei Liu V9fsPDU *pdu = opaque; 308560ce86c7SWei Liu 308660ce86c7SWei Liu v9fs_string_init(&name); 308760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 308860ce86c7SWei Liu if (err < 0) { 308960ce86c7SWei Liu goto out_nofid; 309060ce86c7SWei Liu } 3091fff39a7aSGreg Kurz 3092fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3093fff39a7aSGreg Kurz err = -ENOENT; 3094fff39a7aSGreg Kurz goto out_nofid; 3095fff39a7aSGreg Kurz } 3096fff39a7aSGreg Kurz 3097805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3098805b5d98SGreg Kurz err = -EINVAL; 3099805b5d98SGreg Kurz goto out_nofid; 3100805b5d98SGreg Kurz } 3101805b5d98SGreg Kurz 3102805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3103805b5d98SGreg Kurz err = -ENOTEMPTY; 3104805b5d98SGreg Kurz goto out_nofid; 3105805b5d98SGreg Kurz } 3106805b5d98SGreg Kurz 310767e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 310867e87345SKeno Fischer err = -EINVAL; 310967e87345SKeno Fischer goto out_nofid; 311067e87345SKeno Fischer } 311167e87345SKeno Fischer 311267e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 311367e87345SKeno Fischer rflags |= AT_REMOVEDIR; 311467e87345SKeno Fischer } 311567e87345SKeno Fischer 311660ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 311760ce86c7SWei Liu if (dfidp == NULL) { 311860ce86c7SWei Liu err = -EINVAL; 311960ce86c7SWei Liu goto out_nofid; 312060ce86c7SWei Liu } 312160ce86c7SWei Liu /* 312260ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 312360ce86c7SWei Liu * the file later. So don't reclaim fd 312460ce86c7SWei Liu */ 312560ce86c7SWei Liu v9fs_path_init(&path); 312660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 312760ce86c7SWei Liu if (err < 0) { 312860ce86c7SWei Liu goto out_err; 312960ce86c7SWei Liu } 313060ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 313160ce86c7SWei Liu if (err < 0) { 313260ce86c7SWei Liu goto out_err; 313360ce86c7SWei Liu } 313467e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 313560ce86c7SWei Liu if (!err) { 313660ce86c7SWei Liu err = offset; 313760ce86c7SWei Liu } 313860ce86c7SWei Liu out_err: 313960ce86c7SWei Liu put_fid(pdu, dfidp); 314060ce86c7SWei Liu v9fs_path_free(&path); 314160ce86c7SWei Liu out_nofid: 314260ce86c7SWei Liu pdu_complete(pdu, err); 314360ce86c7SWei Liu v9fs_string_free(&name); 314460ce86c7SWei Liu } 314560ce86c7SWei Liu 314660ce86c7SWei Liu 314760ce86c7SWei Liu /* Only works with path name based fid */ 31488440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 31498440e22eSGreg Kurz int32_t newdirfid, 31508440e22eSGreg Kurz V9fsString *name) 315160ce86c7SWei Liu { 315260ce86c7SWei Liu int err = 0; 315360ce86c7SWei Liu V9fsPath new_path; 315460ce86c7SWei Liu V9fsFidState *tfidp; 315560ce86c7SWei Liu V9fsState *s = pdu->s; 315660ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 315760ce86c7SWei Liu 315860ce86c7SWei Liu v9fs_path_init(&new_path); 315960ce86c7SWei Liu if (newdirfid != -1) { 316060ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 316160ce86c7SWei Liu if (dirfidp == NULL) { 3162b858e80aSDaniel Henrique Barboza return -ENOENT; 316360ce86c7SWei Liu } 316449dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 316549dd946bSGreg Kurz err = -EINVAL; 316649dd946bSGreg Kurz goto out; 316749dd946bSGreg Kurz } 31684fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 31694fa62005SGreg Kurz if (err < 0) { 31704fa62005SGreg Kurz goto out; 31714fa62005SGreg Kurz } 317260ce86c7SWei Liu } else { 31734d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31744d8bc733SJan Dakinevich V9fsPath dir_path; 31754d8bc733SJan Dakinevich 31764d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31774d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31784d8bc733SJan Dakinevich g_free(dir_name); 31794d8bc733SJan Dakinevich 31804d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31814d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31824fa62005SGreg Kurz if (err < 0) { 31834fa62005SGreg Kurz goto out; 31844fa62005SGreg Kurz } 318560ce86c7SWei Liu } 318660ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 318760ce86c7SWei Liu if (err < 0) { 318860ce86c7SWei Liu goto out; 318960ce86c7SWei Liu } 319060ce86c7SWei Liu /* 319160ce86c7SWei Liu * Fixup fid's pointing to the old name to 319260ce86c7SWei Liu * start pointing to the new name 319360ce86c7SWei Liu */ 3194feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 319560ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 319660ce86c7SWei Liu /* replace the name */ 319760ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 319860ce86c7SWei Liu } 319960ce86c7SWei Liu } 320060ce86c7SWei Liu out: 320160ce86c7SWei Liu if (dirfidp) { 320260ce86c7SWei Liu put_fid(pdu, dirfidp); 320360ce86c7SWei Liu } 320460ce86c7SWei Liu v9fs_path_free(&new_path); 320560ce86c7SWei Liu return err; 320660ce86c7SWei Liu } 320760ce86c7SWei Liu 320860ce86c7SWei Liu /* Only works with path name based fid */ 32098440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 321060ce86c7SWei Liu { 321160ce86c7SWei Liu int32_t fid; 321260ce86c7SWei Liu ssize_t err = 0; 321360ce86c7SWei Liu size_t offset = 7; 321460ce86c7SWei Liu V9fsString name; 321560ce86c7SWei Liu int32_t newdirfid; 321660ce86c7SWei Liu V9fsFidState *fidp; 321760ce86c7SWei Liu V9fsPDU *pdu = opaque; 321860ce86c7SWei Liu V9fsState *s = pdu->s; 321960ce86c7SWei Liu 322060ce86c7SWei Liu v9fs_string_init(&name); 322160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 322260ce86c7SWei Liu if (err < 0) { 322360ce86c7SWei Liu goto out_nofid; 322460ce86c7SWei Liu } 3225fff39a7aSGreg Kurz 3226fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3227fff39a7aSGreg Kurz err = -ENOENT; 3228fff39a7aSGreg Kurz goto out_nofid; 3229fff39a7aSGreg Kurz } 3230fff39a7aSGreg Kurz 3231805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3232805b5d98SGreg Kurz err = -EISDIR; 3233805b5d98SGreg Kurz goto out_nofid; 3234805b5d98SGreg Kurz } 3235805b5d98SGreg Kurz 323660ce86c7SWei Liu fidp = get_fid(pdu, fid); 323760ce86c7SWei Liu if (fidp == NULL) { 323860ce86c7SWei Liu err = -ENOENT; 323960ce86c7SWei Liu goto out_nofid; 324060ce86c7SWei Liu } 324149dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 324249dd946bSGreg Kurz err = -EINVAL; 324349dd946bSGreg Kurz goto out; 324449dd946bSGreg Kurz } 324560ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 324660ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 324760ce86c7SWei Liu err = -EOPNOTSUPP; 324860ce86c7SWei Liu goto out; 324960ce86c7SWei Liu } 325060ce86c7SWei Liu v9fs_path_write_lock(s); 325160ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 325260ce86c7SWei Liu v9fs_path_unlock(s); 325360ce86c7SWei Liu if (!err) { 325460ce86c7SWei Liu err = offset; 325560ce86c7SWei Liu } 325660ce86c7SWei Liu out: 325760ce86c7SWei Liu put_fid(pdu, fidp); 325860ce86c7SWei Liu out_nofid: 325960ce86c7SWei Liu pdu_complete(pdu, err); 326060ce86c7SWei Liu v9fs_string_free(&name); 326160ce86c7SWei Liu } 326260ce86c7SWei Liu 32634fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 32648440e22eSGreg Kurz V9fsString *old_name, 32658440e22eSGreg Kurz V9fsPath *newdir, 326660ce86c7SWei Liu V9fsString *new_name) 326760ce86c7SWei Liu { 326860ce86c7SWei Liu V9fsFidState *tfidp; 326960ce86c7SWei Liu V9fsPath oldpath, newpath; 327060ce86c7SWei Liu V9fsState *s = pdu->s; 32714fa62005SGreg Kurz int err; 327260ce86c7SWei Liu 327360ce86c7SWei Liu v9fs_path_init(&oldpath); 327460ce86c7SWei Liu v9fs_path_init(&newpath); 32754fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32764fa62005SGreg Kurz if (err < 0) { 32774fa62005SGreg Kurz goto out; 32784fa62005SGreg Kurz } 32794fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32804fa62005SGreg Kurz if (err < 0) { 32814fa62005SGreg Kurz goto out; 32824fa62005SGreg Kurz } 328360ce86c7SWei Liu 328460ce86c7SWei Liu /* 328560ce86c7SWei Liu * Fixup fid's pointing to the old name to 328660ce86c7SWei Liu * start pointing to the new name 328760ce86c7SWei Liu */ 3288feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 328960ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 329060ce86c7SWei Liu /* replace the name */ 329160ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 329260ce86c7SWei Liu } 329360ce86c7SWei Liu } 32944fa62005SGreg Kurz out: 329560ce86c7SWei Liu v9fs_path_free(&oldpath); 329660ce86c7SWei Liu v9fs_path_free(&newpath); 32974fa62005SGreg Kurz return err; 329860ce86c7SWei Liu } 329960ce86c7SWei Liu 33008440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 33018440e22eSGreg Kurz V9fsString *old_name, 33028440e22eSGreg Kurz int32_t newdirfid, 330360ce86c7SWei Liu V9fsString *new_name) 330460ce86c7SWei Liu { 330560ce86c7SWei Liu int err = 0; 330660ce86c7SWei Liu V9fsState *s = pdu->s; 330760ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 330860ce86c7SWei Liu 330960ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 331060ce86c7SWei Liu if (olddirfidp == NULL) { 331160ce86c7SWei Liu err = -ENOENT; 331260ce86c7SWei Liu goto out; 331360ce86c7SWei Liu } 331460ce86c7SWei Liu if (newdirfid != -1) { 331560ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 331660ce86c7SWei Liu if (newdirfidp == NULL) { 331760ce86c7SWei Liu err = -ENOENT; 331860ce86c7SWei Liu goto out; 331960ce86c7SWei Liu } 332060ce86c7SWei Liu } else { 332160ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 332260ce86c7SWei Liu } 332360ce86c7SWei Liu 332460ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 332560ce86c7SWei Liu &newdirfidp->path, new_name); 332660ce86c7SWei Liu if (err < 0) { 332760ce86c7SWei Liu goto out; 332860ce86c7SWei Liu } 332960ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 333060ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 33314fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 333260ce86c7SWei Liu &newdirfidp->path, new_name); 333360ce86c7SWei Liu } 333460ce86c7SWei Liu out: 333560ce86c7SWei Liu if (olddirfidp) { 333660ce86c7SWei Liu put_fid(pdu, olddirfidp); 333760ce86c7SWei Liu } 333860ce86c7SWei Liu if (newdirfidp) { 333960ce86c7SWei Liu put_fid(pdu, newdirfidp); 334060ce86c7SWei Liu } 334160ce86c7SWei Liu return err; 334260ce86c7SWei Liu } 334360ce86c7SWei Liu 33448440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 334560ce86c7SWei Liu { 334660ce86c7SWei Liu ssize_t err = 0; 334760ce86c7SWei Liu size_t offset = 7; 334860ce86c7SWei Liu V9fsPDU *pdu = opaque; 334960ce86c7SWei Liu V9fsState *s = pdu->s; 335060ce86c7SWei Liu int32_t olddirfid, newdirfid; 335160ce86c7SWei Liu V9fsString old_name, new_name; 335260ce86c7SWei Liu 335360ce86c7SWei Liu v9fs_string_init(&old_name); 335460ce86c7SWei Liu v9fs_string_init(&new_name); 335560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 335660ce86c7SWei Liu &old_name, &newdirfid, &new_name); 335760ce86c7SWei Liu if (err < 0) { 335860ce86c7SWei Liu goto out_err; 335960ce86c7SWei Liu } 336060ce86c7SWei Liu 3361fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3362fff39a7aSGreg Kurz err = -ENOENT; 3363fff39a7aSGreg Kurz goto out_err; 3364fff39a7aSGreg Kurz } 3365fff39a7aSGreg Kurz 3366805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3367805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3368805b5d98SGreg Kurz err = -EISDIR; 3369805b5d98SGreg Kurz goto out_err; 3370805b5d98SGreg Kurz } 3371805b5d98SGreg Kurz 337260ce86c7SWei Liu v9fs_path_write_lock(s); 337360ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 337460ce86c7SWei Liu &old_name, newdirfid, &new_name); 337560ce86c7SWei Liu v9fs_path_unlock(s); 337660ce86c7SWei Liu if (!err) { 337760ce86c7SWei Liu err = offset; 337860ce86c7SWei Liu } 337960ce86c7SWei Liu 338060ce86c7SWei Liu out_err: 338160ce86c7SWei Liu pdu_complete(pdu, err); 338260ce86c7SWei Liu v9fs_string_free(&old_name); 338360ce86c7SWei Liu v9fs_string_free(&new_name); 338460ce86c7SWei Liu } 338560ce86c7SWei Liu 33868440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 338760ce86c7SWei Liu { 338860ce86c7SWei Liu int32_t fid; 338960ce86c7SWei Liu int err = 0; 339060ce86c7SWei Liu int16_t unused; 339160ce86c7SWei Liu V9fsStat v9stat; 339260ce86c7SWei Liu size_t offset = 7; 339360ce86c7SWei Liu struct stat stbuf; 339460ce86c7SWei Liu V9fsFidState *fidp; 339560ce86c7SWei Liu V9fsPDU *pdu = opaque; 33961d203986SGreg Kurz V9fsState *s = pdu->s; 339760ce86c7SWei Liu 339860ce86c7SWei Liu v9fs_stat_init(&v9stat); 339960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 340060ce86c7SWei Liu if (err < 0) { 340160ce86c7SWei Liu goto out_nofid; 340260ce86c7SWei Liu } 340360ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 340460ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 340560ce86c7SWei Liu 340660ce86c7SWei Liu fidp = get_fid(pdu, fid); 340760ce86c7SWei Liu if (fidp == NULL) { 340860ce86c7SWei Liu err = -EINVAL; 340960ce86c7SWei Liu goto out_nofid; 341060ce86c7SWei Liu } 341160ce86c7SWei Liu /* do we need to sync the file? */ 341260ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 341360ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 341460ce86c7SWei Liu goto out; 341560ce86c7SWei Liu } 341660ce86c7SWei Liu if (v9stat.mode != -1) { 341760ce86c7SWei Liu uint32_t v9_mode; 341860ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 341960ce86c7SWei Liu if (err < 0) { 342060ce86c7SWei Liu goto out; 342160ce86c7SWei Liu } 342260ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 342360ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 342460ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 342560ce86c7SWei Liu /* Attempting to change the type */ 342660ce86c7SWei Liu err = -EIO; 342760ce86c7SWei Liu goto out; 342860ce86c7SWei Liu } 342960ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 343060ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 343160ce86c7SWei Liu &v9stat.extension)); 343260ce86c7SWei Liu if (err < 0) { 343360ce86c7SWei Liu goto out; 343460ce86c7SWei Liu } 343560ce86c7SWei Liu } 343660ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 343760ce86c7SWei Liu struct timespec times[2]; 343860ce86c7SWei Liu if (v9stat.atime != -1) { 343960ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 344060ce86c7SWei Liu times[0].tv_nsec = 0; 344160ce86c7SWei Liu } else { 344260ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 344360ce86c7SWei Liu } 344460ce86c7SWei Liu if (v9stat.mtime != -1) { 344560ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 344660ce86c7SWei Liu times[1].tv_nsec = 0; 344760ce86c7SWei Liu } else { 344860ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 344960ce86c7SWei Liu } 345060ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 345160ce86c7SWei Liu if (err < 0) { 345260ce86c7SWei Liu goto out; 345360ce86c7SWei Liu } 345460ce86c7SWei Liu } 345560ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 345660ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 345760ce86c7SWei Liu if (err < 0) { 345860ce86c7SWei Liu goto out; 345960ce86c7SWei Liu } 346060ce86c7SWei Liu } 346160ce86c7SWei Liu if (v9stat.name.size != 0) { 34621d203986SGreg Kurz v9fs_path_write_lock(s); 346360ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 34641d203986SGreg Kurz v9fs_path_unlock(s); 346560ce86c7SWei Liu if (err < 0) { 346660ce86c7SWei Liu goto out; 346760ce86c7SWei Liu } 346860ce86c7SWei Liu } 346960ce86c7SWei Liu if (v9stat.length != -1) { 347060ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 347160ce86c7SWei Liu if (err < 0) { 347260ce86c7SWei Liu goto out; 347360ce86c7SWei Liu } 347460ce86c7SWei Liu } 347560ce86c7SWei Liu err = offset; 347660ce86c7SWei Liu out: 347760ce86c7SWei Liu put_fid(pdu, fidp); 347860ce86c7SWei Liu out_nofid: 347960ce86c7SWei Liu v9fs_stat_free(&v9stat); 348060ce86c7SWei Liu pdu_complete(pdu, err); 348160ce86c7SWei Liu } 348260ce86c7SWei Liu 348360ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 348460ce86c7SWei Liu { 348560ce86c7SWei Liu uint32_t f_type; 348660ce86c7SWei Liu uint32_t f_bsize; 348760ce86c7SWei Liu uint64_t f_blocks; 348860ce86c7SWei Liu uint64_t f_bfree; 348960ce86c7SWei Liu uint64_t f_bavail; 349060ce86c7SWei Liu uint64_t f_files; 349160ce86c7SWei Liu uint64_t f_ffree; 349260ce86c7SWei Liu uint64_t fsid_val; 349360ce86c7SWei Liu uint32_t f_namelen; 349460ce86c7SWei Liu size_t offset = 7; 349560ce86c7SWei Liu int32_t bsize_factor; 349660ce86c7SWei Liu 349760ce86c7SWei Liu /* 349860ce86c7SWei Liu * compute bsize factor based on host file system block size 349960ce86c7SWei Liu * and client msize 350060ce86c7SWei Liu */ 350160ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 350260ce86c7SWei Liu if (!bsize_factor) { 350360ce86c7SWei Liu bsize_factor = 1; 350460ce86c7SWei Liu } 350560ce86c7SWei Liu f_type = stbuf->f_type; 350660ce86c7SWei Liu f_bsize = stbuf->f_bsize; 350760ce86c7SWei Liu f_bsize *= bsize_factor; 350860ce86c7SWei Liu /* 350960ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 351060ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 351160ce86c7SWei Liu * blocks by bsize factor 351260ce86c7SWei Liu */ 351360ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 351460ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 351560ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 351660ce86c7SWei Liu f_files = stbuf->f_files; 351760ce86c7SWei Liu f_ffree = stbuf->f_ffree; 351860ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 351960ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 352060ce86c7SWei Liu f_namelen = stbuf->f_namelen; 352160ce86c7SWei Liu 352260ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 352360ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 352460ce86c7SWei Liu f_bavail, f_files, f_ffree, 352560ce86c7SWei Liu fsid_val, f_namelen); 352660ce86c7SWei Liu } 352760ce86c7SWei Liu 35288440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 352960ce86c7SWei Liu { 353060ce86c7SWei Liu int32_t fid; 353160ce86c7SWei Liu ssize_t retval = 0; 353260ce86c7SWei Liu size_t offset = 7; 353360ce86c7SWei Liu V9fsFidState *fidp; 353460ce86c7SWei Liu struct statfs stbuf; 353560ce86c7SWei Liu V9fsPDU *pdu = opaque; 353660ce86c7SWei Liu V9fsState *s = pdu->s; 353760ce86c7SWei Liu 353860ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 353960ce86c7SWei Liu if (retval < 0) { 354060ce86c7SWei Liu goto out_nofid; 354160ce86c7SWei Liu } 354260ce86c7SWei Liu fidp = get_fid(pdu, fid); 354360ce86c7SWei Liu if (fidp == NULL) { 354460ce86c7SWei Liu retval = -ENOENT; 354560ce86c7SWei Liu goto out_nofid; 354660ce86c7SWei Liu } 354760ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 354860ce86c7SWei Liu if (retval < 0) { 354960ce86c7SWei Liu goto out; 355060ce86c7SWei Liu } 355160ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 355260ce86c7SWei Liu if (retval < 0) { 355360ce86c7SWei Liu goto out; 355460ce86c7SWei Liu } 355560ce86c7SWei Liu retval += offset; 355660ce86c7SWei Liu out: 355760ce86c7SWei Liu put_fid(pdu, fidp); 355860ce86c7SWei Liu out_nofid: 355960ce86c7SWei Liu pdu_complete(pdu, retval); 356060ce86c7SWei Liu } 356160ce86c7SWei Liu 35628440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 356360ce86c7SWei Liu { 356460ce86c7SWei Liu 356560ce86c7SWei Liu int mode; 356660ce86c7SWei Liu gid_t gid; 356760ce86c7SWei Liu int32_t fid; 356860ce86c7SWei Liu V9fsQID qid; 356960ce86c7SWei Liu int err = 0; 357060ce86c7SWei Liu int major, minor; 357160ce86c7SWei Liu size_t offset = 7; 357260ce86c7SWei Liu V9fsString name; 357360ce86c7SWei Liu struct stat stbuf; 357460ce86c7SWei Liu V9fsFidState *fidp; 357560ce86c7SWei Liu V9fsPDU *pdu = opaque; 357660ce86c7SWei Liu 357760ce86c7SWei Liu v9fs_string_init(&name); 357860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 357960ce86c7SWei Liu &major, &minor, &gid); 358060ce86c7SWei Liu if (err < 0) { 358160ce86c7SWei Liu goto out_nofid; 358260ce86c7SWei Liu } 358360ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 358460ce86c7SWei Liu 3585fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3586fff39a7aSGreg Kurz err = -ENOENT; 3587fff39a7aSGreg Kurz goto out_nofid; 3588fff39a7aSGreg Kurz } 3589fff39a7aSGreg Kurz 3590805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3591805b5d98SGreg Kurz err = -EEXIST; 3592805b5d98SGreg Kurz goto out_nofid; 3593805b5d98SGreg Kurz } 3594805b5d98SGreg Kurz 359560ce86c7SWei Liu fidp = get_fid(pdu, fid); 359660ce86c7SWei Liu if (fidp == NULL) { 359760ce86c7SWei Liu err = -ENOENT; 359860ce86c7SWei Liu goto out_nofid; 359960ce86c7SWei Liu } 360060ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 360160ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 360260ce86c7SWei Liu if (err < 0) { 360360ce86c7SWei Liu goto out; 360460ce86c7SWei Liu } 36053b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36063b5ee9e8SAntonios Motakis if (err < 0) { 36073b5ee9e8SAntonios Motakis goto out; 36083b5ee9e8SAntonios Motakis } 360960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 361060ce86c7SWei Liu if (err < 0) { 361160ce86c7SWei Liu goto out; 361260ce86c7SWei Liu } 361360ce86c7SWei Liu err += offset; 361460ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 361560ce86c7SWei Liu qid.type, qid.version, qid.path); 361660ce86c7SWei Liu out: 361760ce86c7SWei Liu put_fid(pdu, fidp); 361860ce86c7SWei Liu out_nofid: 361960ce86c7SWei Liu pdu_complete(pdu, err); 362060ce86c7SWei Liu v9fs_string_free(&name); 362160ce86c7SWei Liu } 362260ce86c7SWei Liu 362360ce86c7SWei Liu /* 362460ce86c7SWei Liu * Implement posix byte range locking code 362560ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 362660ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 362760ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 362860ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 362960ce86c7SWei Liu * So when a TLOCK request comes, always return success 363060ce86c7SWei Liu */ 36318440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 363260ce86c7SWei Liu { 363360ce86c7SWei Liu V9fsFlock flock; 363460ce86c7SWei Liu size_t offset = 7; 363560ce86c7SWei Liu struct stat stbuf; 363660ce86c7SWei Liu V9fsFidState *fidp; 363760ce86c7SWei Liu int32_t fid, err = 0; 363860ce86c7SWei Liu V9fsPDU *pdu = opaque; 363960ce86c7SWei Liu 364060ce86c7SWei Liu v9fs_string_init(&flock.client_id); 364160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 364260ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 364360ce86c7SWei Liu &flock.proc_id, &flock.client_id); 364460ce86c7SWei Liu if (err < 0) { 364560ce86c7SWei Liu goto out_nofid; 364660ce86c7SWei Liu } 364760ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 364860ce86c7SWei Liu flock.type, flock.start, flock.length); 364960ce86c7SWei Liu 365060ce86c7SWei Liu 365160ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 365260ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 365360ce86c7SWei Liu err = -EINVAL; 365460ce86c7SWei Liu goto out_nofid; 365560ce86c7SWei Liu } 365660ce86c7SWei Liu fidp = get_fid(pdu, fid); 365760ce86c7SWei Liu if (fidp == NULL) { 365860ce86c7SWei Liu err = -ENOENT; 365960ce86c7SWei Liu goto out_nofid; 366060ce86c7SWei Liu } 366160ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 366260ce86c7SWei Liu if (err < 0) { 366360ce86c7SWei Liu goto out; 366460ce86c7SWei Liu } 36654bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 36664bae2b39SPaolo Bonzini if (err < 0) { 36674bae2b39SPaolo Bonzini goto out; 36684bae2b39SPaolo Bonzini } 36694bae2b39SPaolo Bonzini err += offset; 36704bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 367160ce86c7SWei Liu out: 367260ce86c7SWei Liu put_fid(pdu, fidp); 367360ce86c7SWei Liu out_nofid: 367460ce86c7SWei Liu pdu_complete(pdu, err); 367560ce86c7SWei Liu v9fs_string_free(&flock.client_id); 367660ce86c7SWei Liu } 367760ce86c7SWei Liu 367860ce86c7SWei Liu /* 367960ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 368060ce86c7SWei Liu * handling is done by client's VFS layer. 368160ce86c7SWei Liu */ 36828440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 368360ce86c7SWei Liu { 368460ce86c7SWei Liu size_t offset = 7; 368560ce86c7SWei Liu struct stat stbuf; 368660ce86c7SWei Liu V9fsFidState *fidp; 368760ce86c7SWei Liu V9fsGetlock glock; 368860ce86c7SWei Liu int32_t fid, err = 0; 368960ce86c7SWei Liu V9fsPDU *pdu = opaque; 369060ce86c7SWei Liu 369160ce86c7SWei Liu v9fs_string_init(&glock.client_id); 369260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 369360ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 369460ce86c7SWei Liu &glock.client_id); 369560ce86c7SWei Liu if (err < 0) { 369660ce86c7SWei Liu goto out_nofid; 369760ce86c7SWei Liu } 369860ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 369960ce86c7SWei Liu glock.type, glock.start, glock.length); 370060ce86c7SWei Liu 370160ce86c7SWei Liu fidp = get_fid(pdu, fid); 370260ce86c7SWei Liu if (fidp == NULL) { 370360ce86c7SWei Liu err = -ENOENT; 370460ce86c7SWei Liu goto out_nofid; 370560ce86c7SWei Liu } 370660ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 370760ce86c7SWei Liu if (err < 0) { 370860ce86c7SWei Liu goto out; 370960ce86c7SWei Liu } 371060ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 371160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", 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; 371660ce86c7SWei Liu } 371760ce86c7SWei Liu err += offset; 371860ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 371960ce86c7SWei Liu glock.length, glock.proc_id); 372060ce86c7SWei Liu out: 372160ce86c7SWei Liu put_fid(pdu, fidp); 372260ce86c7SWei Liu out_nofid: 372360ce86c7SWei Liu pdu_complete(pdu, err); 372460ce86c7SWei Liu v9fs_string_free(&glock.client_id); 372560ce86c7SWei Liu } 372660ce86c7SWei Liu 37278440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 372860ce86c7SWei Liu { 372960ce86c7SWei Liu V9fsPDU *pdu = opaque; 373060ce86c7SWei Liu size_t offset = 7; 373160ce86c7SWei Liu int32_t fid; 373260ce86c7SWei Liu struct stat stbuf; 373360ce86c7SWei Liu V9fsQID qid; 373460ce86c7SWei Liu V9fsString name; 373560ce86c7SWei Liu V9fsFidState *fidp; 373660ce86c7SWei Liu gid_t gid; 373760ce86c7SWei Liu int mode; 373860ce86c7SWei Liu int err = 0; 373960ce86c7SWei Liu 374060ce86c7SWei Liu v9fs_string_init(&name); 374160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 374260ce86c7SWei Liu if (err < 0) { 374360ce86c7SWei Liu goto out_nofid; 374460ce86c7SWei Liu } 374560ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 374660ce86c7SWei Liu 3747fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3748fff39a7aSGreg Kurz err = -ENOENT; 3749fff39a7aSGreg Kurz goto out_nofid; 3750fff39a7aSGreg Kurz } 3751fff39a7aSGreg Kurz 3752805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3753805b5d98SGreg Kurz err = -EEXIST; 3754805b5d98SGreg Kurz goto out_nofid; 3755805b5d98SGreg Kurz } 3756805b5d98SGreg Kurz 375760ce86c7SWei Liu fidp = get_fid(pdu, fid); 375860ce86c7SWei Liu if (fidp == NULL) { 375960ce86c7SWei Liu err = -ENOENT; 376060ce86c7SWei Liu goto out_nofid; 376160ce86c7SWei Liu } 376260ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 376360ce86c7SWei Liu if (err < 0) { 376460ce86c7SWei Liu goto out; 376560ce86c7SWei Liu } 37663b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 37673b5ee9e8SAntonios Motakis if (err < 0) { 37683b5ee9e8SAntonios Motakis goto out; 37693b5ee9e8SAntonios Motakis } 377060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 377160ce86c7SWei Liu if (err < 0) { 377260ce86c7SWei Liu goto out; 377360ce86c7SWei Liu } 377460ce86c7SWei Liu err += offset; 377560ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 377660ce86c7SWei Liu qid.type, qid.version, qid.path, err); 377760ce86c7SWei Liu out: 377860ce86c7SWei Liu put_fid(pdu, fidp); 377960ce86c7SWei Liu out_nofid: 378060ce86c7SWei Liu pdu_complete(pdu, err); 378160ce86c7SWei Liu v9fs_string_free(&name); 378260ce86c7SWei Liu } 378360ce86c7SWei Liu 37848440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 378560ce86c7SWei Liu { 378660ce86c7SWei Liu int64_t size; 378760ce86c7SWei Liu V9fsString name; 378860ce86c7SWei Liu ssize_t err = 0; 378960ce86c7SWei Liu size_t offset = 7; 379060ce86c7SWei Liu int32_t fid, newfid; 379160ce86c7SWei Liu V9fsFidState *file_fidp; 379260ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 379360ce86c7SWei Liu V9fsPDU *pdu = opaque; 379460ce86c7SWei Liu V9fsState *s = pdu->s; 379560ce86c7SWei Liu 379660ce86c7SWei Liu v9fs_string_init(&name); 379760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 379860ce86c7SWei Liu if (err < 0) { 379960ce86c7SWei Liu goto out_nofid; 380060ce86c7SWei Liu } 380160ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 380260ce86c7SWei Liu 380360ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 380460ce86c7SWei Liu if (file_fidp == NULL) { 380560ce86c7SWei Liu err = -ENOENT; 380660ce86c7SWei Liu goto out_nofid; 380760ce86c7SWei Liu } 380860ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 380960ce86c7SWei Liu if (xattr_fidp == NULL) { 381060ce86c7SWei Liu err = -EINVAL; 381160ce86c7SWei Liu goto out; 381260ce86c7SWei Liu } 381360ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3814ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 381560ce86c7SWei Liu /* 381660ce86c7SWei Liu * listxattr request. Get the size first 381760ce86c7SWei Liu */ 381860ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 381960ce86c7SWei Liu if (size < 0) { 382060ce86c7SWei Liu err = size; 382160ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 382260ce86c7SWei Liu goto out; 382360ce86c7SWei Liu } 382460ce86c7SWei Liu /* 382560ce86c7SWei Liu * Read the xattr value 382660ce86c7SWei Liu */ 382760ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 382860ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3829dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38307bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3831a647502cSKeno Fischer if (size) { 383260ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 383360ce86c7SWei Liu xattr_fidp->fs.xattr.value, 383460ce86c7SWei Liu xattr_fidp->fs.xattr.len); 383560ce86c7SWei Liu if (err < 0) { 383660ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 383760ce86c7SWei Liu goto out; 383860ce86c7SWei Liu } 383960ce86c7SWei Liu } 384060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 384160ce86c7SWei Liu if (err < 0) { 384260ce86c7SWei Liu goto out; 384360ce86c7SWei Liu } 384460ce86c7SWei Liu err += offset; 384560ce86c7SWei Liu } else { 384660ce86c7SWei Liu /* 384760ce86c7SWei Liu * specific xattr fid. We check for xattr 384860ce86c7SWei Liu * presence also collect the xattr size 384960ce86c7SWei Liu */ 385060ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 385160ce86c7SWei Liu &name, NULL, 0); 385260ce86c7SWei Liu if (size < 0) { 385360ce86c7SWei Liu err = size; 385460ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 385560ce86c7SWei Liu goto out; 385660ce86c7SWei Liu } 385760ce86c7SWei Liu /* 385860ce86c7SWei Liu * Read the xattr value 385960ce86c7SWei Liu */ 386060ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 386160ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3862dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38637bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3864a647502cSKeno Fischer if (size) { 386560ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 386660ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 386760ce86c7SWei Liu xattr_fidp->fs.xattr.len); 386860ce86c7SWei Liu if (err < 0) { 386960ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 387060ce86c7SWei Liu goto out; 387160ce86c7SWei Liu } 387260ce86c7SWei Liu } 387360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 387460ce86c7SWei Liu if (err < 0) { 387560ce86c7SWei Liu goto out; 387660ce86c7SWei Liu } 387760ce86c7SWei Liu err += offset; 387860ce86c7SWei Liu } 387960ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 388060ce86c7SWei Liu out: 388160ce86c7SWei Liu put_fid(pdu, file_fidp); 388260ce86c7SWei Liu if (xattr_fidp) { 388360ce86c7SWei Liu put_fid(pdu, xattr_fidp); 388460ce86c7SWei Liu } 388560ce86c7SWei Liu out_nofid: 388660ce86c7SWei Liu pdu_complete(pdu, err); 388760ce86c7SWei Liu v9fs_string_free(&name); 388860ce86c7SWei Liu } 388960ce86c7SWei Liu 38908440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 389160ce86c7SWei Liu { 3892aca6897fSKeno Fischer int flags, rflags = 0; 389360ce86c7SWei Liu int32_t fid; 38943b79ef2cSGreg Kurz uint64_t size; 389560ce86c7SWei Liu ssize_t err = 0; 389660ce86c7SWei Liu V9fsString name; 389760ce86c7SWei Liu size_t offset = 7; 389860ce86c7SWei Liu V9fsFidState *file_fidp; 389960ce86c7SWei Liu V9fsFidState *xattr_fidp; 390060ce86c7SWei Liu V9fsPDU *pdu = opaque; 390160ce86c7SWei Liu 390260ce86c7SWei Liu v9fs_string_init(&name); 390360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 390460ce86c7SWei Liu if (err < 0) { 390560ce86c7SWei Liu goto out_nofid; 390660ce86c7SWei Liu } 390760ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 390860ce86c7SWei Liu 3909aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3910aca6897fSKeno Fischer err = -EINVAL; 3911aca6897fSKeno Fischer goto out_nofid; 3912aca6897fSKeno Fischer } 3913aca6897fSKeno Fischer 3914aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3915aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3916aca6897fSKeno Fischer } 3917aca6897fSKeno Fischer 3918aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3919aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3920aca6897fSKeno Fischer } 3921aca6897fSKeno Fischer 39223b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 39233b79ef2cSGreg Kurz err = -E2BIG; 39243b79ef2cSGreg Kurz goto out_nofid; 39253b79ef2cSGreg Kurz } 39263b79ef2cSGreg Kurz 392760ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 392860ce86c7SWei Liu if (file_fidp == NULL) { 392960ce86c7SWei Liu err = -EINVAL; 393060ce86c7SWei Liu goto out_nofid; 393160ce86c7SWei Liu } 3932dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3933dd654e03SGreg Kurz err = -EINVAL; 3934dd654e03SGreg Kurz goto out_put_fid; 3935dd654e03SGreg Kurz } 3936dd654e03SGreg Kurz 393760ce86c7SWei Liu /* Make the file fid point to xattr */ 393860ce86c7SWei Liu xattr_fidp = file_fidp; 393960ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 394060ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3941dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 394260ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3943aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 394460ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 394560ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3946eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 394760ce86c7SWei Liu err = offset; 3948dd654e03SGreg Kurz out_put_fid: 394960ce86c7SWei Liu put_fid(pdu, file_fidp); 395060ce86c7SWei Liu out_nofid: 395160ce86c7SWei Liu pdu_complete(pdu, err); 395260ce86c7SWei Liu v9fs_string_free(&name); 395360ce86c7SWei Liu } 395460ce86c7SWei Liu 39558440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 395660ce86c7SWei Liu { 395760ce86c7SWei Liu V9fsPDU *pdu = opaque; 395860ce86c7SWei Liu size_t offset = 7; 395960ce86c7SWei Liu V9fsString target; 396060ce86c7SWei Liu int32_t fid; 396160ce86c7SWei Liu int err = 0; 396260ce86c7SWei Liu V9fsFidState *fidp; 396360ce86c7SWei Liu 396460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 396560ce86c7SWei Liu if (err < 0) { 396660ce86c7SWei Liu goto out_nofid; 396760ce86c7SWei Liu } 396860ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 396960ce86c7SWei Liu fidp = get_fid(pdu, fid); 397060ce86c7SWei Liu if (fidp == NULL) { 397160ce86c7SWei Liu err = -ENOENT; 397260ce86c7SWei Liu goto out_nofid; 397360ce86c7SWei Liu } 397460ce86c7SWei Liu 397560ce86c7SWei Liu v9fs_string_init(&target); 397660ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 397760ce86c7SWei Liu if (err < 0) { 397860ce86c7SWei Liu goto out; 397960ce86c7SWei Liu } 398060ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 398160ce86c7SWei Liu if (err < 0) { 398260ce86c7SWei Liu v9fs_string_free(&target); 398360ce86c7SWei Liu goto out; 398460ce86c7SWei Liu } 398560ce86c7SWei Liu err += offset; 398660ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 398760ce86c7SWei Liu v9fs_string_free(&target); 398860ce86c7SWei Liu out: 398960ce86c7SWei Liu put_fid(pdu, fidp); 399060ce86c7SWei Liu out_nofid: 399160ce86c7SWei Liu pdu_complete(pdu, err); 399260ce86c7SWei Liu } 399360ce86c7SWei Liu 399460ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 399560ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 399660ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 399760ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 399860ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 399960ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 400060ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 400160ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 400260ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 400360ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 400460ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 400560ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 400660ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 400760ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 400860ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 400960ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 401060ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 401160ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 401260ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 401360ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 401460ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 401560ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 401660ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 401760ce86c7SWei Liu [P9_TREAD] = v9fs_read, 401860ce86c7SWei Liu #if 0 401960ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 402060ce86c7SWei Liu #endif 402160ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 402260ce86c7SWei Liu [P9_TLINK] = v9fs_link, 402360ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 402460ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 402560ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 402660ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 402760ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 402860ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 402960ce86c7SWei Liu }; 403060ce86c7SWei Liu 40318440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 403260ce86c7SWei Liu { 403360ce86c7SWei Liu V9fsPDU *pdu = opaque; 403460ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 403560ce86c7SWei Liu } 403660ce86c7SWei Liu 40378440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 403860ce86c7SWei Liu { 403960ce86c7SWei Liu V9fsPDU *pdu = opaque; 404060ce86c7SWei Liu pdu_complete(pdu, -EROFS); 404160ce86c7SWei Liu } 404260ce86c7SWei Liu 404360ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 404460ce86c7SWei Liu { 404560ce86c7SWei Liu switch (pdu->id) { 404660ce86c7SWei Liu case P9_TREADDIR: 404760ce86c7SWei Liu case P9_TSTATFS: 404860ce86c7SWei Liu case P9_TGETATTR: 404960ce86c7SWei Liu case P9_TXATTRWALK: 405060ce86c7SWei Liu case P9_TLOCK: 405160ce86c7SWei Liu case P9_TGETLOCK: 405260ce86c7SWei Liu case P9_TREADLINK: 405360ce86c7SWei Liu case P9_TVERSION: 405460ce86c7SWei Liu case P9_TLOPEN: 405560ce86c7SWei Liu case P9_TATTACH: 405660ce86c7SWei Liu case P9_TSTAT: 405760ce86c7SWei Liu case P9_TWALK: 405860ce86c7SWei Liu case P9_TCLUNK: 405960ce86c7SWei Liu case P9_TFSYNC: 406060ce86c7SWei Liu case P9_TOPEN: 406160ce86c7SWei Liu case P9_TREAD: 406260ce86c7SWei Liu case P9_TAUTH: 406360ce86c7SWei Liu case P9_TFLUSH: 406460ce86c7SWei Liu return 1; 406560ce86c7SWei Liu default: 406660ce86c7SWei Liu return 0; 406760ce86c7SWei Liu } 406860ce86c7SWei Liu } 406960ce86c7SWei Liu 4070506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 407160ce86c7SWei Liu { 407260ce86c7SWei Liu Coroutine *co; 407360ce86c7SWei Liu CoroutineEntry *handler; 407460ce86c7SWei Liu V9fsState *s = pdu->s; 407560ce86c7SWei Liu 4076506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4077506f3275SGreg Kurz pdu->id = hdr->id; 4078506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4079506f3275SGreg Kurz 408060ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 408160ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 408260ce86c7SWei Liu handler = v9fs_op_not_supp; 4083d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4084d1471233SGreg Kurz handler = v9fs_fs_ro; 408560ce86c7SWei Liu } else { 408660ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 408760ce86c7SWei Liu } 408860ce86c7SWei Liu 4089506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 40900b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 40910b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 409260ce86c7SWei Liu } 409360ce86c7SWei Liu 40942a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4095066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4096066eb006SGreg Kurz Error **errp) 40972a0c56aaSWei Liu { 409892c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 40992a0c56aaSWei Liu int i, len; 41002a0c56aaSWei Liu struct stat stat; 41012a0c56aaSWei Liu FsDriverEntry *fse; 41022a0c56aaSWei Liu V9fsPath path; 41032a0c56aaSWei Liu int rc = 1; 41042a0c56aaSWei Liu 4105066eb006SGreg Kurz assert(!s->transport); 4106066eb006SGreg Kurz s->transport = t; 4107066eb006SGreg Kurz 41082a0c56aaSWei Liu /* initialize pdu allocator */ 41092a0c56aaSWei Liu QLIST_INIT(&s->free_list); 41102a0c56aaSWei Liu QLIST_INIT(&s->active_list); 41110d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4112583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4113583f21f8SStefano Stabellini s->pdus[i].s = s; 4114583f21f8SStefano Stabellini s->pdus[i].idx = i; 41152a0c56aaSWei Liu } 41162a0c56aaSWei Liu 41172a0c56aaSWei Liu v9fs_path_init(&path); 41182a0c56aaSWei Liu 41192a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 41202a0c56aaSWei Liu 41212a0c56aaSWei Liu if (!fse) { 41222a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 41232a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 41242a0c56aaSWei Liu "id = %s", 41252a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 41262a0c56aaSWei Liu goto out; 41272a0c56aaSWei Liu } 41282a0c56aaSWei Liu 41292a0c56aaSWei Liu if (!s->fsconf.tag) { 41302a0c56aaSWei Liu /* we haven't specified a mount_tag */ 41312a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 41322a0c56aaSWei Liu s->fsconf.fsdev_id); 41332a0c56aaSWei Liu goto out; 41342a0c56aaSWei Liu } 41352a0c56aaSWei Liu 41362a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 41372a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 41382a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 41392a0c56aaSWei Liu len = strlen(s->fsconf.tag); 41402a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 41412a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 41422a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 41432a0c56aaSWei Liu goto out; 41442a0c56aaSWei Liu } 41452a0c56aaSWei Liu 41462a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 41472a0c56aaSWei Liu s->ctx.uid = -1; 41482a0c56aaSWei Liu 41492a0c56aaSWei Liu s->ops = fse->ops; 41502a0c56aaSWei Liu 4151b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4152b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4153b96feb2cSTobias Schramm 4154feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 41552a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 41562a0c56aaSWei Liu 415765603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 415865603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 415965603a80SGreg Kurz s->fsconf.fsdev_id); 41602a0c56aaSWei Liu goto out; 41612a0c56aaSWei Liu } 41622a0c56aaSWei Liu 41632a0c56aaSWei Liu /* 41642a0c56aaSWei Liu * Check details of export path, We need to use fs driver 41652a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 41662a0c56aaSWei Liu * use co-routines here. 41672a0c56aaSWei Liu */ 41682a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 41692a0c56aaSWei Liu error_setg(errp, 41702a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 41712a0c56aaSWei Liu goto out; 41722a0c56aaSWei Liu } 41732a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41742a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41752a0c56aaSWei Liu goto out; 41762a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41772a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41782a0c56aaSWei Liu goto out; 41792a0c56aaSWei Liu } 4180b8bbdb88SPradeep Jagadeesh 41813b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41823b5ee9e8SAntonios Motakis 41836b6aa828SChristian Schoenebeck /* init inode remapping : */ 41846b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 41856b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 41866b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 41876b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 41886b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 41891a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 41906b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 41916b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4192f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 41931a6ed33cSAntonios Motakis 4194b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4195b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4196b8bbdb88SPradeep Jagadeesh 41972a0c56aaSWei Liu rc = 0; 41982a0c56aaSWei Liu out: 41992a0c56aaSWei Liu if (rc) { 4200b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4201702dbcc2SLi Qiang } 42022a0c56aaSWei Liu v9fs_path_free(&path); 42032a0c56aaSWei Liu return rc; 42042a0c56aaSWei Liu } 42052a0c56aaSWei Liu 4206b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 42072a0c56aaSWei Liu { 4208c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4209702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4210702dbcc2SLi Qiang } 4211c0da0cb7SGreg Kurz if (s->ctx.fst) { 4212b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4213c0da0cb7SGreg Kurz } 42142a0c56aaSWei Liu g_free(s->tag); 42156b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4216f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4217f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 42184774718eSLi Qiang g_free(s->ctx.fs_root); 42192a0c56aaSWei Liu } 42202a0c56aaSWei Liu 42210e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 42220e44a0fdSGreg Kurz V9fsPDU pdu; 42230e44a0fdSGreg Kurz bool done; 42240e44a0fdSGreg Kurz } VirtfsCoResetData; 42250e44a0fdSGreg Kurz 42260e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 42270e44a0fdSGreg Kurz { 42280e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 42290e44a0fdSGreg Kurz 42300e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 42310e44a0fdSGreg Kurz data->done = true; 42320e44a0fdSGreg Kurz } 42330e44a0fdSGreg Kurz 42340e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 42350e44a0fdSGreg Kurz { 42360e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 42370e44a0fdSGreg Kurz Coroutine *co; 42380e44a0fdSGreg Kurz 42390e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 42400e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42410e44a0fdSGreg Kurz } 42420e44a0fdSGreg Kurz 42430e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 42440e44a0fdSGreg Kurz qemu_coroutine_enter(co); 42450e44a0fdSGreg Kurz 42460e44a0fdSGreg Kurz while (!data.done) { 42470e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42480e44a0fdSGreg Kurz } 42490e44a0fdSGreg Kurz } 42500e44a0fdSGreg Kurz 425160ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 425260ce86c7SWei Liu { 425360ce86c7SWei Liu struct rlimit rlim; 425460ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 425563325b18SGreg Kurz error_report("Failed to get the resource limit"); 425660ce86c7SWei Liu exit(1); 425760ce86c7SWei Liu } 425860ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 425960ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 426060ce86c7SWei Liu } 4261