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> 35e0bd743bSKeno Fischer #ifdef CONFIG_LINUX 3603556ea9SDan Robertson #include <linux/limits.h> 37e0bd743bSKeno Fischer #else 38e0bd743bSKeno Fischer #include <limits.h> 39e0bd743bSKeno Fischer #endif 4060ce86c7SWei Liu 4160ce86c7SWei Liu int open_fd_hw; 4260ce86c7SWei Liu int total_open_fd; 4360ce86c7SWei Liu static int open_fd_rc; 4460ce86c7SWei Liu 4560ce86c7SWei Liu enum { 4660ce86c7SWei Liu Oread = 0x00, 4760ce86c7SWei Liu Owrite = 0x01, 4860ce86c7SWei Liu Ordwr = 0x02, 4960ce86c7SWei Liu Oexec = 0x03, 5060ce86c7SWei Liu Oexcl = 0x04, 5160ce86c7SWei Liu Otrunc = 0x10, 5260ce86c7SWei Liu Orexec = 0x20, 5360ce86c7SWei Liu Orclose = 0x40, 5460ce86c7SWei Liu Oappend = 0x80, 5560ce86c7SWei Liu }; 5660ce86c7SWei Liu 57cc82fde9SChristian Schoenebeck P9ARRAY_DEFINE_TYPE(V9fsPath, v9fs_path_free); 58cc82fde9SChristian Schoenebeck 5975673590SGreg Kurz static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 6060ce86c7SWei Liu { 6160ce86c7SWei Liu ssize_t ret; 6260ce86c7SWei Liu va_list ap; 6360ce86c7SWei Liu 6460ce86c7SWei Liu va_start(ap, fmt); 65ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); 6660ce86c7SWei Liu va_end(ap); 6760ce86c7SWei Liu 6860ce86c7SWei Liu return ret; 6960ce86c7SWei Liu } 7060ce86c7SWei Liu 7175673590SGreg Kurz static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) 7260ce86c7SWei Liu { 7360ce86c7SWei Liu ssize_t ret; 7460ce86c7SWei Liu va_list ap; 7560ce86c7SWei Liu 7660ce86c7SWei Liu va_start(ap, fmt); 77ea83441cSStefano Stabellini ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); 7860ce86c7SWei Liu va_end(ap); 7960ce86c7SWei Liu 8060ce86c7SWei Liu return ret; 8160ce86c7SWei Liu } 8260ce86c7SWei Liu 8360ce86c7SWei Liu static int omode_to_uflags(int8_t mode) 8460ce86c7SWei Liu { 8560ce86c7SWei Liu int ret = 0; 8660ce86c7SWei Liu 8760ce86c7SWei Liu switch (mode & 3) { 8860ce86c7SWei Liu case Oread: 8960ce86c7SWei Liu ret = O_RDONLY; 9060ce86c7SWei Liu break; 9160ce86c7SWei Liu case Ordwr: 9260ce86c7SWei Liu ret = O_RDWR; 9360ce86c7SWei Liu break; 9460ce86c7SWei Liu case Owrite: 9560ce86c7SWei Liu ret = O_WRONLY; 9660ce86c7SWei Liu break; 9760ce86c7SWei Liu case Oexec: 9860ce86c7SWei Liu ret = O_RDONLY; 9960ce86c7SWei Liu break; 10060ce86c7SWei Liu } 10160ce86c7SWei Liu 10260ce86c7SWei Liu if (mode & Otrunc) { 10360ce86c7SWei Liu ret |= O_TRUNC; 10460ce86c7SWei Liu } 10560ce86c7SWei Liu 10660ce86c7SWei Liu if (mode & Oappend) { 10760ce86c7SWei Liu ret |= O_APPEND; 10860ce86c7SWei Liu } 10960ce86c7SWei Liu 11060ce86c7SWei Liu if (mode & Oexcl) { 11160ce86c7SWei Liu ret |= O_EXCL; 11260ce86c7SWei Liu } 11360ce86c7SWei Liu 11460ce86c7SWei Liu return ret; 11560ce86c7SWei Liu } 11660ce86c7SWei Liu 1178e71b96cSGreg Kurz typedef struct DotlOpenflagMap { 11860ce86c7SWei Liu int dotl_flag; 11960ce86c7SWei Liu int open_flag; 1208e71b96cSGreg Kurz } DotlOpenflagMap; 12160ce86c7SWei Liu 12260ce86c7SWei Liu static int dotl_to_open_flags(int flags) 12360ce86c7SWei Liu { 12460ce86c7SWei Liu int i; 12560ce86c7SWei Liu /* 12660ce86c7SWei Liu * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 12760ce86c7SWei Liu * and P9_DOTL_NOACCESS 12860ce86c7SWei Liu */ 12960ce86c7SWei Liu int oflags = flags & O_ACCMODE; 13060ce86c7SWei Liu 1318e71b96cSGreg Kurz DotlOpenflagMap dotl_oflag_map[] = { 13260ce86c7SWei Liu { P9_DOTL_CREATE, O_CREAT }, 13360ce86c7SWei Liu { P9_DOTL_EXCL, O_EXCL }, 13460ce86c7SWei Liu { P9_DOTL_NOCTTY , O_NOCTTY }, 13560ce86c7SWei Liu { P9_DOTL_TRUNC, O_TRUNC }, 13660ce86c7SWei Liu { P9_DOTL_APPEND, O_APPEND }, 13760ce86c7SWei Liu { P9_DOTL_NONBLOCK, O_NONBLOCK } , 13860ce86c7SWei Liu { P9_DOTL_DSYNC, O_DSYNC }, 13960ce86c7SWei Liu { P9_DOTL_FASYNC, FASYNC }, 14060ce86c7SWei Liu { P9_DOTL_DIRECT, O_DIRECT }, 14160ce86c7SWei Liu { P9_DOTL_LARGEFILE, O_LARGEFILE }, 14260ce86c7SWei Liu { P9_DOTL_DIRECTORY, O_DIRECTORY }, 14360ce86c7SWei Liu { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, 14460ce86c7SWei Liu { P9_DOTL_NOATIME, O_NOATIME }, 14560ce86c7SWei Liu { P9_DOTL_SYNC, O_SYNC }, 14660ce86c7SWei Liu }; 14760ce86c7SWei Liu 14860ce86c7SWei Liu for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 14960ce86c7SWei Liu if (flags & dotl_oflag_map[i].dotl_flag) { 15060ce86c7SWei Liu oflags |= dotl_oflag_map[i].open_flag; 15160ce86c7SWei Liu } 15260ce86c7SWei Liu } 15360ce86c7SWei Liu 15460ce86c7SWei Liu return oflags; 15560ce86c7SWei Liu } 15660ce86c7SWei Liu 15760ce86c7SWei Liu void cred_init(FsCred *credp) 15860ce86c7SWei Liu { 15960ce86c7SWei Liu credp->fc_uid = -1; 16060ce86c7SWei Liu credp->fc_gid = -1; 16160ce86c7SWei Liu credp->fc_mode = -1; 16260ce86c7SWei Liu credp->fc_rdev = -1; 16360ce86c7SWei Liu } 16460ce86c7SWei Liu 16560ce86c7SWei Liu static int get_dotl_openflags(V9fsState *s, int oflags) 16660ce86c7SWei Liu { 16760ce86c7SWei Liu int flags; 16860ce86c7SWei Liu /* 16960ce86c7SWei Liu * Filter the client open flags 17060ce86c7SWei Liu */ 17160ce86c7SWei Liu flags = dotl_to_open_flags(oflags); 17260ce86c7SWei Liu flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); 17360ce86c7SWei Liu /* 17460ce86c7SWei Liu * Ignore direct disk access hint until the server supports it. 17560ce86c7SWei Liu */ 17660ce86c7SWei Liu flags &= ~O_DIRECT; 17760ce86c7SWei Liu return flags; 17860ce86c7SWei Liu } 17960ce86c7SWei Liu 18060ce86c7SWei Liu void v9fs_path_init(V9fsPath *path) 18160ce86c7SWei Liu { 18260ce86c7SWei Liu path->data = NULL; 18360ce86c7SWei Liu path->size = 0; 18460ce86c7SWei Liu } 18560ce86c7SWei Liu 18660ce86c7SWei Liu void v9fs_path_free(V9fsPath *path) 18760ce86c7SWei Liu { 18860ce86c7SWei Liu g_free(path->data); 18960ce86c7SWei Liu path->data = NULL; 19060ce86c7SWei Liu path->size = 0; 19160ce86c7SWei Liu } 19260ce86c7SWei Liu 193e3e83f2eSGreg Kurz 194e3e83f2eSGreg Kurz void GCC_FMT_ATTR(2, 3) 195e3e83f2eSGreg Kurz v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) 196e3e83f2eSGreg Kurz { 197e3e83f2eSGreg Kurz va_list ap; 198e3e83f2eSGreg Kurz 199e3e83f2eSGreg Kurz v9fs_path_free(path); 200e3e83f2eSGreg Kurz 201e3e83f2eSGreg Kurz va_start(ap, fmt); 202e3e83f2eSGreg Kurz /* Bump the size for including terminating NULL */ 203e3e83f2eSGreg Kurz path->size = g_vasprintf(&path->data, fmt, ap) + 1; 204e3e83f2eSGreg Kurz va_end(ap); 205e3e83f2eSGreg Kurz } 206e3e83f2eSGreg Kurz 207e446a1ebSMarc-André Lureau void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) 20860ce86c7SWei Liu { 209e446a1ebSMarc-André Lureau v9fs_path_free(dst); 210e446a1ebSMarc-André Lureau dst->size = src->size; 211e446a1ebSMarc-André Lureau dst->data = g_memdup(src->data, src->size); 21260ce86c7SWei Liu } 21360ce86c7SWei Liu 21460ce86c7SWei Liu int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 21560ce86c7SWei Liu const char *name, V9fsPath *path) 21660ce86c7SWei Liu { 21760ce86c7SWei Liu int err; 21860ce86c7SWei Liu err = s->ops->name_to_path(&s->ctx, dirpath, name, path); 21960ce86c7SWei Liu if (err < 0) { 22060ce86c7SWei Liu err = -errno; 22160ce86c7SWei Liu } 22260ce86c7SWei Liu return err; 22360ce86c7SWei Liu } 22460ce86c7SWei Liu 22560ce86c7SWei Liu /* 22660ce86c7SWei Liu * Return TRUE if s1 is an ancestor of s2. 22760ce86c7SWei Liu * 22860ce86c7SWei Liu * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". 22960ce86c7SWei Liu * As a special case, We treat s1 as ancestor of s2 if they are same! 23060ce86c7SWei Liu */ 23160ce86c7SWei Liu static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) 23260ce86c7SWei Liu { 23360ce86c7SWei Liu if (!strncmp(s1->data, s2->data, s1->size - 1)) { 23460ce86c7SWei Liu if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { 23560ce86c7SWei Liu return 1; 23660ce86c7SWei Liu } 23760ce86c7SWei Liu } 23860ce86c7SWei Liu return 0; 23960ce86c7SWei Liu } 24060ce86c7SWei Liu 24160ce86c7SWei Liu static size_t v9fs_string_size(V9fsString *str) 24260ce86c7SWei Liu { 24360ce86c7SWei Liu return str->size; 24460ce86c7SWei Liu } 24560ce86c7SWei Liu 24660ce86c7SWei Liu /* 24760ce86c7SWei Liu * returns 0 if fid got re-opened, 1 if not, < 0 on error */ 2488440e22eSGreg Kurz static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) 24960ce86c7SWei Liu { 25060ce86c7SWei Liu int err = 1; 25160ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 25260ce86c7SWei Liu if (f->fs.fd == -1) { 25360ce86c7SWei Liu do { 25460ce86c7SWei Liu err = v9fs_co_open(pdu, f, f->open_flags); 25560ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 25660ce86c7SWei Liu } 25760ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 258f314ea4eSGreg Kurz if (f->fs.dir.stream == NULL) { 25960ce86c7SWei Liu do { 26060ce86c7SWei Liu err = v9fs_co_opendir(pdu, f); 26160ce86c7SWei Liu } while (err == -EINTR && !pdu->cancelled); 26260ce86c7SWei Liu } 26360ce86c7SWei Liu } 26460ce86c7SWei Liu return err; 26560ce86c7SWei Liu } 26660ce86c7SWei Liu 2678440e22eSGreg Kurz static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) 26860ce86c7SWei Liu { 26960ce86c7SWei Liu int err; 27060ce86c7SWei Liu V9fsFidState *f; 27160ce86c7SWei Liu V9fsState *s = pdu->s; 27260ce86c7SWei Liu 273feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 27460ce86c7SWei Liu BUG_ON(f->clunked); 27560ce86c7SWei Liu if (f->fid == fid) { 27660ce86c7SWei Liu /* 27760ce86c7SWei Liu * Update the fid ref upfront so that 27860ce86c7SWei Liu * we don't get reclaimed when we yield 27960ce86c7SWei Liu * in open later. 28060ce86c7SWei Liu */ 28160ce86c7SWei Liu f->ref++; 28260ce86c7SWei Liu /* 28360ce86c7SWei Liu * check whether we need to reopen the 28460ce86c7SWei Liu * file. We might have closed the fd 28560ce86c7SWei Liu * while trying to free up some file 28660ce86c7SWei Liu * descriptors. 28760ce86c7SWei Liu */ 28860ce86c7SWei Liu err = v9fs_reopen_fid(pdu, f); 28960ce86c7SWei Liu if (err < 0) { 29060ce86c7SWei Liu f->ref--; 29160ce86c7SWei Liu return NULL; 29260ce86c7SWei Liu } 29360ce86c7SWei Liu /* 29460ce86c7SWei Liu * Mark the fid as referenced so that the LRU 29560ce86c7SWei Liu * reclaim won't close the file descriptor 29660ce86c7SWei Liu */ 29760ce86c7SWei Liu f->flags |= FID_REFERENCED; 29860ce86c7SWei Liu return f; 29960ce86c7SWei Liu } 30060ce86c7SWei Liu } 30160ce86c7SWei Liu return NULL; 30260ce86c7SWei Liu } 30360ce86c7SWei Liu 30460ce86c7SWei Liu static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) 30560ce86c7SWei Liu { 30660ce86c7SWei Liu V9fsFidState *f; 30760ce86c7SWei Liu 308feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 30960ce86c7SWei Liu /* If fid is already there return NULL */ 31060ce86c7SWei Liu BUG_ON(f->clunked); 31160ce86c7SWei Liu if (f->fid == fid) { 31260ce86c7SWei Liu return NULL; 31360ce86c7SWei Liu } 31460ce86c7SWei Liu } 31560ce86c7SWei Liu f = g_malloc0(sizeof(V9fsFidState)); 31660ce86c7SWei Liu f->fid = fid; 31760ce86c7SWei Liu f->fid_type = P9_FID_NONE; 31860ce86c7SWei Liu f->ref = 1; 31960ce86c7SWei Liu /* 32060ce86c7SWei Liu * Mark the fid as referenced so that the LRU 32160ce86c7SWei Liu * reclaim won't close the file descriptor 32260ce86c7SWei Liu */ 32360ce86c7SWei Liu f->flags |= FID_REFERENCED; 32420b7f45bSGreg Kurz QSIMPLEQ_INSERT_TAIL(&s->fid_list, f, next); 32560ce86c7SWei Liu 326d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs.dir); 327d2c5cf7cSChristian Schoenebeck v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); 3287cde47d4SGreg Kurz 32960ce86c7SWei Liu return f; 33060ce86c7SWei Liu } 33160ce86c7SWei Liu 3328440e22eSGreg Kurz static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) 33360ce86c7SWei Liu { 33460ce86c7SWei Liu int retval = 0; 33560ce86c7SWei Liu 336dd28fbbcSLi Qiang if (fidp->fs.xattr.xattrwalk_fid) { 33760ce86c7SWei Liu /* getxattr/listxattr fid */ 33860ce86c7SWei Liu goto free_value; 33960ce86c7SWei Liu } 34060ce86c7SWei Liu /* 34160ce86c7SWei Liu * if this is fid for setxattr. clunk should 34260ce86c7SWei Liu * result in setxattr localcall 34360ce86c7SWei Liu */ 34460ce86c7SWei Liu if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { 34560ce86c7SWei Liu /* clunk after partial write */ 34660ce86c7SWei Liu retval = -EINVAL; 34760ce86c7SWei Liu goto free_out; 34860ce86c7SWei Liu } 34960ce86c7SWei Liu if (fidp->fs.xattr.len) { 35060ce86c7SWei Liu retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, 35160ce86c7SWei Liu fidp->fs.xattr.value, 35260ce86c7SWei Liu fidp->fs.xattr.len, 35360ce86c7SWei Liu fidp->fs.xattr.flags); 35460ce86c7SWei Liu } else { 35560ce86c7SWei Liu retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); 35660ce86c7SWei Liu } 35760ce86c7SWei Liu free_out: 35860ce86c7SWei Liu v9fs_string_free(&fidp->fs.xattr.name); 35960ce86c7SWei Liu free_value: 36060ce86c7SWei Liu g_free(fidp->fs.xattr.value); 36160ce86c7SWei Liu return retval; 36260ce86c7SWei Liu } 36360ce86c7SWei Liu 3648440e22eSGreg Kurz static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) 36560ce86c7SWei Liu { 36660ce86c7SWei Liu int retval = 0; 36760ce86c7SWei Liu 36860ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 36960ce86c7SWei Liu /* If we reclaimed the fd no need to close */ 37060ce86c7SWei Liu if (fidp->fs.fd != -1) { 37160ce86c7SWei Liu retval = v9fs_co_close(pdu, &fidp->fs); 37260ce86c7SWei Liu } 37360ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_DIR) { 374f314ea4eSGreg Kurz if (fidp->fs.dir.stream != NULL) { 37560ce86c7SWei Liu retval = v9fs_co_closedir(pdu, &fidp->fs); 37660ce86c7SWei Liu } 37760ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 37860ce86c7SWei Liu retval = v9fs_xattr_fid_clunk(pdu, fidp); 37960ce86c7SWei Liu } 38060ce86c7SWei Liu v9fs_path_free(&fidp->path); 38160ce86c7SWei Liu g_free(fidp); 38260ce86c7SWei Liu return retval; 38360ce86c7SWei Liu } 38460ce86c7SWei Liu 3858440e22eSGreg Kurz static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) 38660ce86c7SWei Liu { 38760ce86c7SWei Liu BUG_ON(!fidp->ref); 38860ce86c7SWei Liu fidp->ref--; 38960ce86c7SWei Liu /* 39060ce86c7SWei Liu * Don't free the fid if it is in reclaim list 39160ce86c7SWei Liu */ 39260ce86c7SWei Liu if (!fidp->ref && fidp->clunked) { 39360ce86c7SWei Liu if (fidp->fid == pdu->s->root_fid) { 39460ce86c7SWei Liu /* 39560ce86c7SWei Liu * if the clunked fid is root fid then we 39660ce86c7SWei Liu * have unmounted the fs on the client side. 39760ce86c7SWei Liu * delete the migration blocker. Ideally, this 39860ce86c7SWei Liu * should be hooked to transport close notification 39960ce86c7SWei Liu */ 40060ce86c7SWei Liu if (pdu->s->migration_blocker) { 40160ce86c7SWei Liu migrate_del_blocker(pdu->s->migration_blocker); 40260ce86c7SWei Liu error_free(pdu->s->migration_blocker); 40360ce86c7SWei Liu pdu->s->migration_blocker = NULL; 40460ce86c7SWei Liu } 40560ce86c7SWei Liu } 40660ce86c7SWei Liu return free_fid(pdu, fidp); 40760ce86c7SWei Liu } 40860ce86c7SWei Liu return 0; 40960ce86c7SWei Liu } 41060ce86c7SWei Liu 41160ce86c7SWei Liu static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) 41260ce86c7SWei Liu { 413feabd6cfSGreg Kurz V9fsFidState *fidp; 41460ce86c7SWei Liu 415feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(fidp, &s->fid_list, next) { 416feabd6cfSGreg Kurz if (fidp->fid == fid) { 417feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 4182e53160fSGreg Kurz fidp->clunked = true; 41960ce86c7SWei Liu return fidp; 42060ce86c7SWei Liu } 421feabd6cfSGreg Kurz } 422feabd6cfSGreg Kurz return NULL; 423feabd6cfSGreg Kurz } 42460ce86c7SWei Liu 4258440e22eSGreg Kurz void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) 42660ce86c7SWei Liu { 42760ce86c7SWei Liu int reclaim_count = 0; 42860ce86c7SWei Liu V9fsState *s = pdu->s; 42981f9766bSGreg Kurz V9fsFidState *f; 43081f9766bSGreg Kurz QSLIST_HEAD(, V9fsFidState) reclaim_list = 43181f9766bSGreg Kurz QSLIST_HEAD_INITIALIZER(reclaim_list); 43260ce86c7SWei Liu 433feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(f, &s->fid_list, next) { 43460ce86c7SWei Liu /* 43560ce86c7SWei Liu * Unlink fids cannot be reclaimed. Check 43660ce86c7SWei Liu * for them and skip them. Also skip fids 43760ce86c7SWei Liu * currently being operated on. 43860ce86c7SWei Liu */ 43960ce86c7SWei Liu if (f->ref || f->flags & FID_NON_RECLAIMABLE) { 44060ce86c7SWei Liu continue; 44160ce86c7SWei Liu } 44260ce86c7SWei Liu /* 44360ce86c7SWei Liu * if it is a recently referenced fid 44460ce86c7SWei Liu * we leave the fid untouched and clear the 44560ce86c7SWei Liu * reference bit. We come back to it later 44660ce86c7SWei Liu * in the next iteration. (a simple LRU without 44760ce86c7SWei Liu * moving list elements around) 44860ce86c7SWei Liu */ 44960ce86c7SWei Liu if (f->flags & FID_REFERENCED) { 45060ce86c7SWei Liu f->flags &= ~FID_REFERENCED; 45160ce86c7SWei Liu continue; 45260ce86c7SWei Liu } 45360ce86c7SWei Liu /* 45460ce86c7SWei Liu * Add fids to reclaim list. 45560ce86c7SWei Liu */ 45660ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 45760ce86c7SWei Liu if (f->fs.fd != -1) { 45860ce86c7SWei Liu /* 45960ce86c7SWei Liu * Up the reference count so that 46060ce86c7SWei Liu * a clunk request won't free this fid 46160ce86c7SWei Liu */ 46260ce86c7SWei Liu f->ref++; 46381f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 46460ce86c7SWei Liu f->fs_reclaim.fd = f->fs.fd; 46560ce86c7SWei Liu f->fs.fd = -1; 46660ce86c7SWei Liu reclaim_count++; 46760ce86c7SWei Liu } 46860ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 469f314ea4eSGreg Kurz if (f->fs.dir.stream != NULL) { 47060ce86c7SWei Liu /* 47160ce86c7SWei Liu * Up the reference count so that 47260ce86c7SWei Liu * a clunk request won't free this fid 47360ce86c7SWei Liu */ 47460ce86c7SWei Liu f->ref++; 47581f9766bSGreg Kurz QSLIST_INSERT_HEAD(&reclaim_list, f, reclaim_next); 476f314ea4eSGreg Kurz f->fs_reclaim.dir.stream = f->fs.dir.stream; 477f314ea4eSGreg Kurz f->fs.dir.stream = NULL; 47860ce86c7SWei Liu reclaim_count++; 47960ce86c7SWei Liu } 48060ce86c7SWei Liu } 48160ce86c7SWei Liu if (reclaim_count >= open_fd_rc) { 48260ce86c7SWei Liu break; 48360ce86c7SWei Liu } 48460ce86c7SWei Liu } 48560ce86c7SWei Liu /* 48660ce86c7SWei Liu * Now close the fid in reclaim list. Free them if they 48760ce86c7SWei Liu * are already clunked. 48860ce86c7SWei Liu */ 48981f9766bSGreg Kurz while (!QSLIST_EMPTY(&reclaim_list)) { 49081f9766bSGreg Kurz f = QSLIST_FIRST(&reclaim_list); 49181f9766bSGreg Kurz QSLIST_REMOVE(&reclaim_list, f, V9fsFidState, reclaim_next); 49260ce86c7SWei Liu if (f->fid_type == P9_FID_FILE) { 49360ce86c7SWei Liu v9fs_co_close(pdu, &f->fs_reclaim); 49460ce86c7SWei Liu } else if (f->fid_type == P9_FID_DIR) { 49560ce86c7SWei Liu v9fs_co_closedir(pdu, &f->fs_reclaim); 49660ce86c7SWei Liu } 49760ce86c7SWei Liu /* 49860ce86c7SWei Liu * Now drop the fid reference, free it 49960ce86c7SWei Liu * if clunked. 50060ce86c7SWei Liu */ 50160ce86c7SWei Liu put_fid(pdu, f); 50260ce86c7SWei Liu } 50360ce86c7SWei Liu } 50460ce86c7SWei Liu 5058440e22eSGreg Kurz static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) 50660ce86c7SWei Liu { 50760ce86c7SWei Liu int err; 50860ce86c7SWei Liu V9fsState *s = pdu->s; 50920b7f45bSGreg Kurz V9fsFidState *fidp, *fidp_next; 51060ce86c7SWei Liu 51120b7f45bSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 51220b7f45bSGreg Kurz if (!fidp) { 51320b7f45bSGreg Kurz return 0; 51460ce86c7SWei Liu } 51520b7f45bSGreg Kurz 51620b7f45bSGreg Kurz /* 51720b7f45bSGreg Kurz * v9fs_reopen_fid() can yield : a reference on the fid must be held 51820b7f45bSGreg Kurz * to ensure its pointer remains valid and we can safely pass it to 51920b7f45bSGreg Kurz * QSIMPLEQ_NEXT(). The corresponding put_fid() can also yield so 52020b7f45bSGreg Kurz * we must keep a reference on the next fid as well. So the logic here 52120b7f45bSGreg Kurz * is to get a reference on a fid and only put it back during the next 52220b7f45bSGreg Kurz * iteration after we could get a reference on the next fid. Start with 52320b7f45bSGreg Kurz * the first one. 52420b7f45bSGreg Kurz */ 52520b7f45bSGreg Kurz for (fidp->ref++; fidp; fidp = fidp_next) { 52620b7f45bSGreg Kurz if (fidp->path.size == path->size && 52720b7f45bSGreg Kurz !memcmp(fidp->path.data, path->data, path->size)) { 52860ce86c7SWei Liu /* Mark the fid non reclaimable. */ 52960ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 53060ce86c7SWei Liu 53160ce86c7SWei Liu /* reopen the file/dir if already closed */ 53260ce86c7SWei Liu err = v9fs_reopen_fid(pdu, fidp); 53360ce86c7SWei Liu if (err < 0) { 53420b7f45bSGreg Kurz put_fid(pdu, fidp); 535267fcadfSGreg Kurz return err; 53660ce86c7SWei Liu } 53720b7f45bSGreg Kurz } 53820b7f45bSGreg Kurz 53920b7f45bSGreg Kurz fidp_next = QSIMPLEQ_NEXT(fidp, next); 54020b7f45bSGreg Kurz 54120b7f45bSGreg Kurz if (fidp_next) { 54260ce86c7SWei Liu /* 54320b7f45bSGreg Kurz * Ensure the next fid survives a potential clunk request during 54420b7f45bSGreg Kurz * put_fid() below and v9fs_reopen_fid() in the next iteration. 54560ce86c7SWei Liu */ 54620b7f45bSGreg Kurz fidp_next->ref++; 54760ce86c7SWei Liu } 54820b7f45bSGreg Kurz 54920b7f45bSGreg Kurz /* We're done with this fid */ 55020b7f45bSGreg Kurz put_fid(pdu, fidp); 55160ce86c7SWei Liu } 55220b7f45bSGreg Kurz 55360ce86c7SWei Liu return 0; 55460ce86c7SWei Liu } 55560ce86c7SWei Liu 5568440e22eSGreg Kurz static void coroutine_fn virtfs_reset(V9fsPDU *pdu) 55760ce86c7SWei Liu { 55860ce86c7SWei Liu V9fsState *s = pdu->s; 55979decce3SGreg Kurz V9fsFidState *fidp; 56060ce86c7SWei Liu 56160ce86c7SWei Liu /* Free all fids */ 562feabd6cfSGreg Kurz while (!QSIMPLEQ_EMPTY(&s->fid_list)) { 5636d54af0eSGreg Kurz /* Get fid */ 564feabd6cfSGreg Kurz fidp = QSIMPLEQ_FIRST(&s->fid_list); 5656d54af0eSGreg Kurz fidp->ref++; 56660ce86c7SWei Liu 5676d54af0eSGreg Kurz /* Clunk fid */ 568feabd6cfSGreg Kurz QSIMPLEQ_REMOVE(&s->fid_list, fidp, V9fsFidState, next); 5692e53160fSGreg Kurz fidp->clunked = true; 5706d54af0eSGreg Kurz 5716d54af0eSGreg Kurz put_fid(pdu, fidp); 57260ce86c7SWei Liu } 57360ce86c7SWei Liu } 57460ce86c7SWei Liu 57560ce86c7SWei Liu #define P9_QID_TYPE_DIR 0x80 57660ce86c7SWei Liu #define P9_QID_TYPE_SYMLINK 0x02 57760ce86c7SWei Liu 57860ce86c7SWei Liu #define P9_STAT_MODE_DIR 0x80000000 57960ce86c7SWei Liu #define P9_STAT_MODE_APPEND 0x40000000 58060ce86c7SWei Liu #define P9_STAT_MODE_EXCL 0x20000000 58160ce86c7SWei Liu #define P9_STAT_MODE_MOUNT 0x10000000 58260ce86c7SWei Liu #define P9_STAT_MODE_AUTH 0x08000000 58360ce86c7SWei Liu #define P9_STAT_MODE_TMP 0x04000000 58460ce86c7SWei Liu #define P9_STAT_MODE_SYMLINK 0x02000000 58560ce86c7SWei Liu #define P9_STAT_MODE_LINK 0x01000000 58660ce86c7SWei Liu #define P9_STAT_MODE_DEVICE 0x00800000 58760ce86c7SWei Liu #define P9_STAT_MODE_NAMED_PIPE 0x00200000 58860ce86c7SWei Liu #define P9_STAT_MODE_SOCKET 0x00100000 58960ce86c7SWei Liu #define P9_STAT_MODE_SETUID 0x00080000 59060ce86c7SWei Liu #define P9_STAT_MODE_SETGID 0x00040000 59160ce86c7SWei Liu #define P9_STAT_MODE_SETVTX 0x00010000 59260ce86c7SWei Liu 59360ce86c7SWei Liu #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ 59460ce86c7SWei Liu P9_STAT_MODE_SYMLINK | \ 59560ce86c7SWei Liu P9_STAT_MODE_LINK | \ 59660ce86c7SWei Liu P9_STAT_MODE_DEVICE | \ 59760ce86c7SWei Liu P9_STAT_MODE_NAMED_PIPE | \ 59860ce86c7SWei Liu P9_STAT_MODE_SOCKET) 59960ce86c7SWei Liu 6006b6aa828SChristian Schoenebeck /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ 6016b6aa828SChristian Schoenebeck static inline uint8_t mirror8bit(uint8_t byte) 6026b6aa828SChristian Schoenebeck { 6036b6aa828SChristian Schoenebeck return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; 6046b6aa828SChristian Schoenebeck } 6056b6aa828SChristian Schoenebeck 6066b6aa828SChristian Schoenebeck /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ 6076b6aa828SChristian Schoenebeck static inline uint64_t mirror64bit(uint64_t value) 6086b6aa828SChristian Schoenebeck { 6096b6aa828SChristian Schoenebeck return ((uint64_t)mirror8bit(value & 0xff) << 56) | 6106b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | 6116b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | 6126b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | 6136b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | 6146b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | 6156b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | 6166b6aa828SChristian Schoenebeck ((uint64_t)mirror8bit((value >> 56) & 0xff)); 6176b6aa828SChristian Schoenebeck } 6186b6aa828SChristian Schoenebeck 6196b6aa828SChristian Schoenebeck /** 6206b6aa828SChristian Schoenebeck * @brief Parameter k for the Exponential Golomb algorihm to be used. 6216b6aa828SChristian Schoenebeck * 6226b6aa828SChristian Schoenebeck * The smaller this value, the smaller the minimum bit count for the Exp. 6236b6aa828SChristian Schoenebeck * Golomb generated affixes will be (at lowest index) however for the 6246b6aa828SChristian Schoenebeck * price of having higher maximum bit count of generated affixes (at highest 6256b6aa828SChristian Schoenebeck * index). Likewise increasing this parameter yields in smaller maximum bit 6266b6aa828SChristian Schoenebeck * count for the price of having higher minimum bit count. 6276b6aa828SChristian Schoenebeck * 6286b6aa828SChristian Schoenebeck * In practice that means: a good value for k depends on the expected amount 6296b6aa828SChristian Schoenebeck * of devices to be exposed by one export. For a small amount of devices k 6306b6aa828SChristian Schoenebeck * should be small, for a large amount of devices k might be increased 6316b6aa828SChristian Schoenebeck * instead. The default of k=0 should be fine for most users though. 6326b6aa828SChristian Schoenebeck * 6336b6aa828SChristian Schoenebeck * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of 6346b6aa828SChristian Schoenebeck * k should not change as long as guest is still running! Because that would 6356b6aa828SChristian Schoenebeck * cause completely different inode numbers to be generated on guest. 6366b6aa828SChristian Schoenebeck */ 6376b6aa828SChristian Schoenebeck #define EXP_GOLOMB_K 0 6386b6aa828SChristian Schoenebeck 6396b6aa828SChristian Schoenebeck /** 6406b6aa828SChristian Schoenebeck * @brief Exponential Golomb algorithm for arbitrary k (including k=0). 6416b6aa828SChristian Schoenebeck * 6426b6aa828SChristian Schoenebeck * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) 6436b6aa828SChristian Schoenebeck * with growing length and with the mathematical property of being 6446b6aa828SChristian Schoenebeck * "prefix-free". The latter means the generated prefixes can be prepended 6456b6aa828SChristian Schoenebeck * in front of arbitrary numbers and the resulting concatenated numbers are 6466b6aa828SChristian Schoenebeck * guaranteed to be always unique. 6476b6aa828SChristian Schoenebeck * 6486b6aa828SChristian Schoenebeck * This is a minor adjustment to the original Exp. Golomb algorithm in the 6496b6aa828SChristian Schoenebeck * sense that lowest allowed index (@param n) starts with 1, not with zero. 6506b6aa828SChristian Schoenebeck * 6516b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the prefix to be generated 6526b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 6536b6aa828SChristian Schoenebeck * @param k - parameter k of Exp. Golomb algorithm to be used 6546b6aa828SChristian Schoenebeck * (see comment on EXP_GOLOMB_K macro for details about k) 6556b6aa828SChristian Schoenebeck */ 6566b6aa828SChristian Schoenebeck static VariLenAffix expGolombEncode(uint64_t n, int k) 6576b6aa828SChristian Schoenebeck { 6586b6aa828SChristian Schoenebeck const uint64_t value = n + (1 << k) - 1; 6596b6aa828SChristian Schoenebeck const int bits = (int) log2(value) + 1; 6606b6aa828SChristian Schoenebeck return (VariLenAffix) { 6616b6aa828SChristian Schoenebeck .type = AffixType_Prefix, 6626b6aa828SChristian Schoenebeck .value = value, 6636b6aa828SChristian Schoenebeck .bits = bits + MAX((bits - 1 - k), 0) 6646b6aa828SChristian Schoenebeck }; 6656b6aa828SChristian Schoenebeck } 6666b6aa828SChristian Schoenebeck 6676b6aa828SChristian Schoenebeck /** 6686b6aa828SChristian Schoenebeck * @brief Converts a suffix into a prefix, or a prefix into a suffix. 6696b6aa828SChristian Schoenebeck * 6706b6aa828SChristian Schoenebeck * Simply mirror all bits of the affix value, for the purpose to preserve 6716b6aa828SChristian Schoenebeck * respectively the mathematical "prefix-free" or "suffix-free" property 6726b6aa828SChristian Schoenebeck * after the conversion. 6736b6aa828SChristian Schoenebeck * 6746b6aa828SChristian Schoenebeck * If a passed prefix is suitable to create unique numbers, then the 6756b6aa828SChristian Schoenebeck * returned suffix is suitable to create unique numbers as well (and vice 6766b6aa828SChristian Schoenebeck * versa). 6776b6aa828SChristian Schoenebeck */ 6786b6aa828SChristian Schoenebeck static VariLenAffix invertAffix(const VariLenAffix *affix) 6796b6aa828SChristian Schoenebeck { 6806b6aa828SChristian Schoenebeck return (VariLenAffix) { 6816b6aa828SChristian Schoenebeck .type = 6826b6aa828SChristian Schoenebeck (affix->type == AffixType_Suffix) ? 6836b6aa828SChristian Schoenebeck AffixType_Prefix : AffixType_Suffix, 6846b6aa828SChristian Schoenebeck .value = 6856b6aa828SChristian Schoenebeck mirror64bit(affix->value) >> 6866b6aa828SChristian Schoenebeck ((sizeof(affix->value) * 8) - affix->bits), 6876b6aa828SChristian Schoenebeck .bits = affix->bits 6886b6aa828SChristian Schoenebeck }; 6896b6aa828SChristian Schoenebeck } 6906b6aa828SChristian Schoenebeck 6916b6aa828SChristian Schoenebeck /** 6926b6aa828SChristian Schoenebeck * @brief Generates suffix numbers with "suffix-free" property. 6936b6aa828SChristian Schoenebeck * 6946b6aa828SChristian Schoenebeck * This is just a wrapper function on top of the Exp. Golomb algorithm. 6956b6aa828SChristian Schoenebeck * 6966b6aa828SChristian Schoenebeck * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, 6976b6aa828SChristian Schoenebeck * this function converts the Exp. Golomb prefixes into appropriate suffixes 6986b6aa828SChristian Schoenebeck * which are still suitable for generating unique numbers. 6996b6aa828SChristian Schoenebeck * 7006b6aa828SChristian Schoenebeck * @param n - natural number (or index) of the suffix to be generated 7016b6aa828SChristian Schoenebeck * (1, 2, 3, ...) 7026b6aa828SChristian Schoenebeck */ 7036b6aa828SChristian Schoenebeck static VariLenAffix affixForIndex(uint64_t index) 7046b6aa828SChristian Schoenebeck { 7056b6aa828SChristian Schoenebeck VariLenAffix prefix; 7066b6aa828SChristian Schoenebeck prefix = expGolombEncode(index, EXP_GOLOMB_K); 7076b6aa828SChristian Schoenebeck return invertAffix(&prefix); /* convert prefix to suffix */ 7086b6aa828SChristian Schoenebeck } 7096b6aa828SChristian Schoenebeck 7101a6ed33cSAntonios Motakis /* creative abuse of tb_hash_func7, which is based on xxhash */ 7111a6ed33cSAntonios Motakis static uint32_t qpp_hash(QppEntry e) 7121a6ed33cSAntonios Motakis { 7131a6ed33cSAntonios Motakis return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); 7141a6ed33cSAntonios Motakis } 7151a6ed33cSAntonios Motakis 716f3fe4a2dSAntonios Motakis static uint32_t qpf_hash(QpfEntry e) 717f3fe4a2dSAntonios Motakis { 718f3fe4a2dSAntonios Motakis return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); 719f3fe4a2dSAntonios Motakis } 720f3fe4a2dSAntonios Motakis 7216b6aa828SChristian Schoenebeck static bool qpd_cmp_func(const void *obj, const void *userp) 7226b6aa828SChristian Schoenebeck { 7236b6aa828SChristian Schoenebeck const QpdEntry *e1 = obj, *e2 = userp; 7246b6aa828SChristian Schoenebeck return e1->dev == e2->dev; 7256b6aa828SChristian Schoenebeck } 7266b6aa828SChristian Schoenebeck 7276b6aa828SChristian Schoenebeck static bool qpp_cmp_func(const void *obj, const void *userp) 7281a6ed33cSAntonios Motakis { 7291a6ed33cSAntonios Motakis const QppEntry *e1 = obj, *e2 = userp; 7301a6ed33cSAntonios Motakis return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; 7311a6ed33cSAntonios Motakis } 7321a6ed33cSAntonios Motakis 7336b6aa828SChristian Schoenebeck static bool qpf_cmp_func(const void *obj, const void *userp) 734f3fe4a2dSAntonios Motakis { 735f3fe4a2dSAntonios Motakis const QpfEntry *e1 = obj, *e2 = userp; 736f3fe4a2dSAntonios Motakis return e1->dev == e2->dev && e1->ino == e2->ino; 737f3fe4a2dSAntonios Motakis } 738f3fe4a2dSAntonios Motakis 739f3fe4a2dSAntonios Motakis static void qp_table_remove(void *p, uint32_t h, void *up) 7401a6ed33cSAntonios Motakis { 7411a6ed33cSAntonios Motakis g_free(p); 7421a6ed33cSAntonios Motakis } 7431a6ed33cSAntonios Motakis 744f3fe4a2dSAntonios Motakis static void qp_table_destroy(struct qht *ht) 7451a6ed33cSAntonios Motakis { 7461a6ed33cSAntonios Motakis if (!ht || !ht->map) { 7471a6ed33cSAntonios Motakis return; 7481a6ed33cSAntonios Motakis } 749f3fe4a2dSAntonios Motakis qht_iter(ht, qp_table_remove, NULL); 7501a6ed33cSAntonios Motakis qht_destroy(ht); 7511a6ed33cSAntonios Motakis } 7521a6ed33cSAntonios Motakis 7536b6aa828SChristian Schoenebeck static void qpd_table_init(struct qht *ht) 7546b6aa828SChristian Schoenebeck { 7556b6aa828SChristian Schoenebeck qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7566b6aa828SChristian Schoenebeck } 7576b6aa828SChristian Schoenebeck 7581a6ed33cSAntonios Motakis static void qpp_table_init(struct qht *ht) 7591a6ed33cSAntonios Motakis { 7606b6aa828SChristian Schoenebeck qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); 7611a6ed33cSAntonios Motakis } 7621a6ed33cSAntonios Motakis 763f3fe4a2dSAntonios Motakis static void qpf_table_init(struct qht *ht) 764f3fe4a2dSAntonios Motakis { 7656b6aa828SChristian Schoenebeck qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); 766f3fe4a2dSAntonios Motakis } 767f3fe4a2dSAntonios Motakis 7686b6aa828SChristian Schoenebeck /* 7696b6aa828SChristian Schoenebeck * Returns how many (high end) bits of inode numbers of the passed fs 7706b6aa828SChristian Schoenebeck * device shall be used (in combination with the device number) to 7716b6aa828SChristian Schoenebeck * generate hash values for qpp_table entries. 7726b6aa828SChristian Schoenebeck * 7736b6aa828SChristian Schoenebeck * This function is required if variable length suffixes are used for inode 7746b6aa828SChristian Schoenebeck * number mapping on guest level. Since a device may end up having multiple 7756b6aa828SChristian Schoenebeck * entries in qpp_table, each entry most probably with a different suffix 7766b6aa828SChristian Schoenebeck * length, we thus need this function in conjunction with qpd_table to 7776b6aa828SChristian Schoenebeck * "agree" about a fix amount of bits (per device) to be always used for 7786b6aa828SChristian Schoenebeck * generating hash values for the purpose of accessing qpp_table in order 7796b6aa828SChristian Schoenebeck * get consistent behaviour when accessing qpp_table. 7806b6aa828SChristian Schoenebeck */ 7816b6aa828SChristian Schoenebeck static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) 7826b6aa828SChristian Schoenebeck { 7836b6aa828SChristian Schoenebeck QpdEntry lookup = { 7846b6aa828SChristian Schoenebeck .dev = dev 7856b6aa828SChristian Schoenebeck }, *val; 7866b6aa828SChristian Schoenebeck uint32_t hash = dev; 7876b6aa828SChristian Schoenebeck VariLenAffix affix; 7886b6aa828SChristian Schoenebeck 7896b6aa828SChristian Schoenebeck val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); 7906b6aa828SChristian Schoenebeck if (!val) { 7916b6aa828SChristian Schoenebeck val = g_malloc0(sizeof(QpdEntry)); 7926b6aa828SChristian Schoenebeck *val = lookup; 7936b6aa828SChristian Schoenebeck affix = affixForIndex(pdu->s->qp_affix_next); 7946b6aa828SChristian Schoenebeck val->prefix_bits = affix.bits; 7956b6aa828SChristian Schoenebeck qht_insert(&pdu->s->qpd_table, val, hash, NULL); 7966b6aa828SChristian Schoenebeck pdu->s->qp_ndevices++; 7976b6aa828SChristian Schoenebeck } 7986b6aa828SChristian Schoenebeck return val->prefix_bits; 7996b6aa828SChristian Schoenebeck } 8006b6aa828SChristian Schoenebeck 8016b6aa828SChristian Schoenebeck /** 8026b6aa828SChristian Schoenebeck * @brief Slow / full mapping host inode nr -> guest inode nr. 8036b6aa828SChristian Schoenebeck * 8046b6aa828SChristian Schoenebeck * This function performs a slower and much more costly remapping of an 8056b6aa828SChristian Schoenebeck * original file inode number on host to an appropriate different inode 8066b6aa828SChristian Schoenebeck * number on guest. For every (dev, inode) combination on host a new 8076b6aa828SChristian Schoenebeck * sequential number is generated, cached and exposed as inode number on 8086b6aa828SChristian Schoenebeck * guest. 8096b6aa828SChristian Schoenebeck * 8106b6aa828SChristian Schoenebeck * This is just a "last resort" fallback solution if the much faster/cheaper 8116b6aa828SChristian Schoenebeck * qid_path_suffixmap() failed. In practice this slow / full mapping is not 8126b6aa828SChristian Schoenebeck * expected ever to be used at all though. 8136b6aa828SChristian Schoenebeck * 8146b6aa828SChristian Schoenebeck * @see qid_path_suffixmap() for details 8156b6aa828SChristian Schoenebeck * 8166b6aa828SChristian Schoenebeck */ 817f3fe4a2dSAntonios Motakis static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, 818f3fe4a2dSAntonios Motakis uint64_t *path) 819f3fe4a2dSAntonios Motakis { 820f3fe4a2dSAntonios Motakis QpfEntry lookup = { 821f3fe4a2dSAntonios Motakis .dev = stbuf->st_dev, 822f3fe4a2dSAntonios Motakis .ino = stbuf->st_ino 823f3fe4a2dSAntonios Motakis }, *val; 824f3fe4a2dSAntonios Motakis uint32_t hash = qpf_hash(lookup); 8256b6aa828SChristian Schoenebeck VariLenAffix affix; 826f3fe4a2dSAntonios Motakis 827f3fe4a2dSAntonios Motakis val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); 828f3fe4a2dSAntonios Motakis 829f3fe4a2dSAntonios Motakis if (!val) { 830f3fe4a2dSAntonios Motakis if (pdu->s->qp_fullpath_next == 0) { 831f3fe4a2dSAntonios Motakis /* no more files can be mapped :'( */ 832f3fe4a2dSAntonios Motakis error_report_once( 833f3fe4a2dSAntonios Motakis "9p: No more prefixes available for remapping inodes from " 834f3fe4a2dSAntonios Motakis "host to guest." 835f3fe4a2dSAntonios Motakis ); 836f3fe4a2dSAntonios Motakis return -ENFILE; 837f3fe4a2dSAntonios Motakis } 838f3fe4a2dSAntonios Motakis 839f3fe4a2dSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 840f3fe4a2dSAntonios Motakis *val = lookup; 841f3fe4a2dSAntonios Motakis 842f3fe4a2dSAntonios Motakis /* new unique inode and device combo */ 8436b6aa828SChristian Schoenebeck affix = affixForIndex( 8446b6aa828SChristian Schoenebeck 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) 8456b6aa828SChristian Schoenebeck ); 8466b6aa828SChristian Schoenebeck val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; 8476b6aa828SChristian Schoenebeck pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); 848f3fe4a2dSAntonios Motakis qht_insert(&pdu->s->qpf_table, val, hash, NULL); 849f3fe4a2dSAntonios Motakis } 850f3fe4a2dSAntonios Motakis 851f3fe4a2dSAntonios Motakis *path = val->path; 852f3fe4a2dSAntonios Motakis return 0; 853f3fe4a2dSAntonios Motakis } 854f3fe4a2dSAntonios Motakis 8556b6aa828SChristian Schoenebeck /** 8566b6aa828SChristian Schoenebeck * @brief Quick mapping host inode nr -> guest inode nr. 8571a6ed33cSAntonios Motakis * 8586b6aa828SChristian Schoenebeck * This function performs quick remapping of an original file inode number 8596b6aa828SChristian Schoenebeck * on host to an appropriate different inode number on guest. This remapping 8606b6aa828SChristian Schoenebeck * of inodes is required to avoid inode nr collisions on guest which would 8616b6aa828SChristian Schoenebeck * happen if the 9p export contains more than 1 exported file system (or 8626b6aa828SChristian Schoenebeck * more than 1 file system data set), because unlike on host level where the 8636b6aa828SChristian Schoenebeck * files would have different device nrs, all files exported by 9p would 8646b6aa828SChristian Schoenebeck * share the same device nr on guest (the device nr of the virtual 9p device 8656b6aa828SChristian Schoenebeck * that is). 8666b6aa828SChristian Schoenebeck * 8676b6aa828SChristian Schoenebeck * Inode remapping is performed by chopping off high end bits of the original 8686b6aa828SChristian Schoenebeck * inode number from host, shifting the result upwards and then assigning a 8696b6aa828SChristian Schoenebeck * generated suffix number for the low end bits, where the same suffix number 8706b6aa828SChristian Schoenebeck * will be shared by all inodes with the same device id AND the same high end 8716b6aa828SChristian Schoenebeck * bits that have been chopped off. That approach utilizes the fact that inode 8726b6aa828SChristian Schoenebeck * numbers very likely share the same high end bits (i.e. due to their common 8736b6aa828SChristian Schoenebeck * sequential generation by file systems) and hence we only have to generate 8746b6aa828SChristian Schoenebeck * and track a very limited amount of suffixes in practice due to that. 8756b6aa828SChristian Schoenebeck * 8766b6aa828SChristian Schoenebeck * We generate variable size suffixes for that purpose. The 1st generated 8776b6aa828SChristian Schoenebeck * suffix will only have 1 bit and hence we only need to chop off 1 bit from 8786b6aa828SChristian Schoenebeck * the original inode number. The subsequent suffixes being generated will 8796b6aa828SChristian Schoenebeck * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being 8806b6aa828SChristian Schoenebeck * generated will have 3 bits and hence we have to chop off 3 bits from their 8816b6aa828SChristian Schoenebeck * original inodes, and so on. That approach of using variable length suffixes 8826b6aa828SChristian Schoenebeck * (i.e. over fixed size ones) utilizes the fact that in practice only a very 8836b6aa828SChristian Schoenebeck * limited amount of devices are shared by the same export (e.g. typically 8846b6aa828SChristian Schoenebeck * less than 2 dozen devices per 9p export), so in practice we need to chop 8856b6aa828SChristian Schoenebeck * off less bits than with fixed size prefixes and yet are flexible to add 8866b6aa828SChristian Schoenebeck * new devices at runtime below host's export directory at any time without 8876b6aa828SChristian Schoenebeck * having to reboot guest nor requiring to reconfigure guest for that. And due 8886b6aa828SChristian Schoenebeck * to the very limited amount of original high end bits that we chop off that 8896b6aa828SChristian Schoenebeck * way, the total amount of suffixes we need to generate is less than by using 8906b6aa828SChristian Schoenebeck * fixed size prefixes and hence it also improves performance of the inode 8916b6aa828SChristian Schoenebeck * remapping algorithm, and finally has the nice side effect that the inode 8926b6aa828SChristian Schoenebeck * numbers on guest will be much smaller & human friendly. ;-) 8931a6ed33cSAntonios Motakis */ 8946b6aa828SChristian Schoenebeck static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, 8951a6ed33cSAntonios Motakis uint64_t *path) 8961a6ed33cSAntonios Motakis { 8976b6aa828SChristian Schoenebeck const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); 8981a6ed33cSAntonios Motakis QppEntry lookup = { 8991a6ed33cSAntonios Motakis .dev = stbuf->st_dev, 9006b6aa828SChristian Schoenebeck .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) 9011a6ed33cSAntonios Motakis }, *val; 9021a6ed33cSAntonios Motakis uint32_t hash = qpp_hash(lookup); 9031a6ed33cSAntonios Motakis 9041a6ed33cSAntonios Motakis val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); 9051a6ed33cSAntonios Motakis 9061a6ed33cSAntonios Motakis if (!val) { 9076b6aa828SChristian Schoenebeck if (pdu->s->qp_affix_next == 0) { 9086b6aa828SChristian Schoenebeck /* we ran out of affixes */ 909f3fe4a2dSAntonios Motakis warn_report_once( 910f3fe4a2dSAntonios Motakis "9p: Potential degraded performance of inode remapping" 9111a6ed33cSAntonios Motakis ); 9121a6ed33cSAntonios Motakis return -ENFILE; 9131a6ed33cSAntonios Motakis } 9141a6ed33cSAntonios Motakis 9151a6ed33cSAntonios Motakis val = g_malloc0(sizeof(QppEntry)); 9161a6ed33cSAntonios Motakis *val = lookup; 9171a6ed33cSAntonios Motakis 9186b6aa828SChristian Schoenebeck /* new unique inode affix and device combo */ 9196b6aa828SChristian Schoenebeck val->qp_affix_index = pdu->s->qp_affix_next++; 9206b6aa828SChristian Schoenebeck val->qp_affix = affixForIndex(val->qp_affix_index); 9211a6ed33cSAntonios Motakis qht_insert(&pdu->s->qpp_table, val, hash, NULL); 9221a6ed33cSAntonios Motakis } 9236b6aa828SChristian Schoenebeck /* assuming generated affix to be suffix type, not prefix */ 9246b6aa828SChristian Schoenebeck *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; 9251a6ed33cSAntonios Motakis return 0; 9261a6ed33cSAntonios Motakis } 9271a6ed33cSAntonios Motakis 9283b5ee9e8SAntonios Motakis static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) 92960ce86c7SWei Liu { 9301a6ed33cSAntonios Motakis int err; 93160ce86c7SWei Liu size_t size; 93260ce86c7SWei Liu 9331a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 9341a6ed33cSAntonios Motakis /* map inode+device to qid path (fast path) */ 9356b6aa828SChristian Schoenebeck err = qid_path_suffixmap(pdu, stbuf, &qidp->path); 936f3fe4a2dSAntonios Motakis if (err == -ENFILE) { 937f3fe4a2dSAntonios Motakis /* fast path didn't work, fall back to full map */ 938f3fe4a2dSAntonios Motakis err = qid_path_fullmap(pdu, stbuf, &qidp->path); 939f3fe4a2dSAntonios Motakis } 9401a6ed33cSAntonios Motakis if (err) { 9411a6ed33cSAntonios Motakis return err; 9421a6ed33cSAntonios Motakis } 9431a6ed33cSAntonios Motakis } else { 9443b5ee9e8SAntonios Motakis if (pdu->s->dev_id != stbuf->st_dev) { 9451a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { 9461a6ed33cSAntonios Motakis error_report_once( 9471a6ed33cSAntonios Motakis "9p: Multiple devices detected in same VirtFS export. " 9481a6ed33cSAntonios Motakis "Access of guest to additional devices is (partly) " 9491a6ed33cSAntonios Motakis "denied due to virtfs option 'multidevs=forbid' being " 9501a6ed33cSAntonios Motakis "effective." 9511a6ed33cSAntonios Motakis ); 9521a6ed33cSAntonios Motakis return -ENODEV; 9531a6ed33cSAntonios Motakis } else { 9543b5ee9e8SAntonios Motakis warn_report_once( 9553b5ee9e8SAntonios Motakis "9p: Multiple devices detected in same VirtFS export, " 9563b5ee9e8SAntonios Motakis "which might lead to file ID collisions and severe " 9571a6ed33cSAntonios Motakis "misbehaviours on guest! You should either use a " 9581a6ed33cSAntonios Motakis "separate export for each device shared from host or " 9591a6ed33cSAntonios Motakis "use virtfs option 'multidevs=remap'!" 9603b5ee9e8SAntonios Motakis ); 9613b5ee9e8SAntonios Motakis } 9621a6ed33cSAntonios Motakis } 96360ce86c7SWei Liu memset(&qidp->path, 0, sizeof(qidp->path)); 96460ce86c7SWei Liu size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); 96560ce86c7SWei Liu memcpy(&qidp->path, &stbuf->st_ino, size); 9661a6ed33cSAntonios Motakis } 9671a6ed33cSAntonios Motakis 96860ce86c7SWei Liu qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); 96960ce86c7SWei Liu qidp->type = 0; 97060ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 97160ce86c7SWei Liu qidp->type |= P9_QID_TYPE_DIR; 97260ce86c7SWei Liu } 97360ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 97460ce86c7SWei Liu qidp->type |= P9_QID_TYPE_SYMLINK; 97560ce86c7SWei Liu } 9763b5ee9e8SAntonios Motakis 9773b5ee9e8SAntonios Motakis return 0; 97860ce86c7SWei Liu } 97960ce86c7SWei Liu 98060ce86c7SWei Liu V9fsPDU *pdu_alloc(V9fsState *s) 98160ce86c7SWei Liu { 98260ce86c7SWei Liu V9fsPDU *pdu = NULL; 98360ce86c7SWei Liu 98460ce86c7SWei Liu if (!QLIST_EMPTY(&s->free_list)) { 98560ce86c7SWei Liu pdu = QLIST_FIRST(&s->free_list); 98660ce86c7SWei Liu QLIST_REMOVE(pdu, next); 98760ce86c7SWei Liu QLIST_INSERT_HEAD(&s->active_list, pdu, next); 98860ce86c7SWei Liu } 98960ce86c7SWei Liu return pdu; 99060ce86c7SWei Liu } 99160ce86c7SWei Liu 99260ce86c7SWei Liu void pdu_free(V9fsPDU *pdu) 99360ce86c7SWei Liu { 99460ce86c7SWei Liu V9fsState *s = pdu->s; 995f74e27bfSGreg Kurz 996f74e27bfSGreg Kurz g_assert(!pdu->cancelled); 99760ce86c7SWei Liu QLIST_REMOVE(pdu, next); 99860ce86c7SWei Liu QLIST_INSERT_HEAD(&s->free_list, pdu, next); 99960ce86c7SWei Liu } 100060ce86c7SWei Liu 10018440e22eSGreg Kurz static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) 100260ce86c7SWei Liu { 100360ce86c7SWei Liu int8_t id = pdu->id + 1; /* Response */ 100460ce86c7SWei Liu V9fsState *s = pdu->s; 100506a37db7SGreg Kurz int ret; 100660ce86c7SWei Liu 1007fc78d5eeSKeno Fischer /* 1008fc78d5eeSKeno Fischer * The 9p spec requires that successfully cancelled pdus receive no reply. 1009fc78d5eeSKeno Fischer * Sending a reply would confuse clients because they would 1010fc78d5eeSKeno Fischer * assume that any EINTR is the actual result of the operation, 1011fc78d5eeSKeno Fischer * rather than a consequence of the cancellation. However, if 1012fc78d5eeSKeno Fischer * the operation completed (succesfully or with an error other 1013fc78d5eeSKeno Fischer * than caused be cancellation), we do send out that reply, both 1014fc78d5eeSKeno Fischer * for efficiency and to avoid confusing the rest of the state machine 1015fc78d5eeSKeno Fischer * that assumes passing a non-error here will mean a successful 1016fc78d5eeSKeno Fischer * transmission of the reply. 1017fc78d5eeSKeno Fischer */ 1018fc78d5eeSKeno Fischer bool discard = pdu->cancelled && len == -EINTR; 1019fc78d5eeSKeno Fischer if (discard) { 1020fc78d5eeSKeno Fischer trace_v9fs_rcancel(pdu->tag, pdu->id); 1021fc78d5eeSKeno Fischer pdu->size = 0; 1022fc78d5eeSKeno Fischer goto out_notify; 1023fc78d5eeSKeno Fischer } 1024fc78d5eeSKeno Fischer 102560ce86c7SWei Liu if (len < 0) { 102660ce86c7SWei Liu int err = -len; 102760ce86c7SWei Liu len = 7; 102860ce86c7SWei Liu 102960ce86c7SWei Liu if (s->proto_version != V9FS_PROTO_2000L) { 103060ce86c7SWei Liu V9fsString str; 103160ce86c7SWei Liu 103260ce86c7SWei Liu str.data = strerror(err); 103360ce86c7SWei Liu str.size = strlen(str.data); 103460ce86c7SWei Liu 103506a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "s", &str); 103606a37db7SGreg Kurz if (ret < 0) { 103706a37db7SGreg Kurz goto out_notify; 103806a37db7SGreg Kurz } 103906a37db7SGreg Kurz len += ret; 104060ce86c7SWei Liu id = P9_RERROR; 104160ce86c7SWei Liu } 104260ce86c7SWei Liu 104306a37db7SGreg Kurz ret = pdu_marshal(pdu, len, "d", err); 104406a37db7SGreg Kurz if (ret < 0) { 104506a37db7SGreg Kurz goto out_notify; 104606a37db7SGreg Kurz } 104706a37db7SGreg Kurz len += ret; 104860ce86c7SWei Liu 104960ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 105060ce86c7SWei Liu id = P9_RLERROR; 105160ce86c7SWei Liu } 105260ce86c7SWei Liu trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ 105360ce86c7SWei Liu } 105460ce86c7SWei Liu 105560ce86c7SWei Liu /* fill out the header */ 105606a37db7SGreg Kurz if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { 105706a37db7SGreg Kurz goto out_notify; 105806a37db7SGreg Kurz } 105960ce86c7SWei Liu 106060ce86c7SWei Liu /* keep these in sync */ 106160ce86c7SWei Liu pdu->size = len; 106260ce86c7SWei Liu pdu->id = id; 106360ce86c7SWei Liu 106406a37db7SGreg Kurz out_notify: 1065a17d8659SGreg Kurz pdu->s->transport->push_and_notify(pdu); 106660ce86c7SWei Liu 106760ce86c7SWei Liu /* Now wakeup anybody waiting in flush for this request */ 1068f74e27bfSGreg Kurz if (!qemu_co_queue_next(&pdu->complete)) { 106960ce86c7SWei Liu pdu_free(pdu); 107060ce86c7SWei Liu } 1071f74e27bfSGreg Kurz } 107260ce86c7SWei Liu 107360ce86c7SWei Liu static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) 107460ce86c7SWei Liu { 107560ce86c7SWei Liu mode_t ret; 107660ce86c7SWei Liu 107760ce86c7SWei Liu ret = mode & 0777; 107860ce86c7SWei Liu if (mode & P9_STAT_MODE_DIR) { 107960ce86c7SWei Liu ret |= S_IFDIR; 108060ce86c7SWei Liu } 108160ce86c7SWei Liu 108260ce86c7SWei Liu if (mode & P9_STAT_MODE_SYMLINK) { 108360ce86c7SWei Liu ret |= S_IFLNK; 108460ce86c7SWei Liu } 108560ce86c7SWei Liu if (mode & P9_STAT_MODE_SOCKET) { 108660ce86c7SWei Liu ret |= S_IFSOCK; 108760ce86c7SWei Liu } 108860ce86c7SWei Liu if (mode & P9_STAT_MODE_NAMED_PIPE) { 108960ce86c7SWei Liu ret |= S_IFIFO; 109060ce86c7SWei Liu } 109160ce86c7SWei Liu if (mode & P9_STAT_MODE_DEVICE) { 109260ce86c7SWei Liu if (extension->size && extension->data[0] == 'c') { 109360ce86c7SWei Liu ret |= S_IFCHR; 109460ce86c7SWei Liu } else { 109560ce86c7SWei Liu ret |= S_IFBLK; 109660ce86c7SWei Liu } 109760ce86c7SWei Liu } 109860ce86c7SWei Liu 109960ce86c7SWei Liu if (!(ret & ~0777)) { 110060ce86c7SWei Liu ret |= S_IFREG; 110160ce86c7SWei Liu } 110260ce86c7SWei Liu 110360ce86c7SWei Liu if (mode & P9_STAT_MODE_SETUID) { 110460ce86c7SWei Liu ret |= S_ISUID; 110560ce86c7SWei Liu } 110660ce86c7SWei Liu if (mode & P9_STAT_MODE_SETGID) { 110760ce86c7SWei Liu ret |= S_ISGID; 110860ce86c7SWei Liu } 110960ce86c7SWei Liu if (mode & P9_STAT_MODE_SETVTX) { 111060ce86c7SWei Liu ret |= S_ISVTX; 111160ce86c7SWei Liu } 111260ce86c7SWei Liu 111360ce86c7SWei Liu return ret; 111460ce86c7SWei Liu } 111560ce86c7SWei Liu 111660ce86c7SWei Liu static int donttouch_stat(V9fsStat *stat) 111760ce86c7SWei Liu { 111860ce86c7SWei Liu if (stat->type == -1 && 111960ce86c7SWei Liu stat->dev == -1 && 112087032833SAntonios Motakis stat->qid.type == 0xff && 112187032833SAntonios Motakis stat->qid.version == (uint32_t) -1 && 112287032833SAntonios Motakis stat->qid.path == (uint64_t) -1 && 112360ce86c7SWei Liu stat->mode == -1 && 112460ce86c7SWei Liu stat->atime == -1 && 112560ce86c7SWei Liu stat->mtime == -1 && 112660ce86c7SWei Liu stat->length == -1 && 112760ce86c7SWei Liu !stat->name.size && 112860ce86c7SWei Liu !stat->uid.size && 112960ce86c7SWei Liu !stat->gid.size && 113060ce86c7SWei Liu !stat->muid.size && 113160ce86c7SWei Liu stat->n_uid == -1 && 113260ce86c7SWei Liu stat->n_gid == -1 && 113360ce86c7SWei Liu stat->n_muid == -1) { 113460ce86c7SWei Liu return 1; 113560ce86c7SWei Liu } 113660ce86c7SWei Liu 113760ce86c7SWei Liu return 0; 113860ce86c7SWei Liu } 113960ce86c7SWei Liu 114060ce86c7SWei Liu static void v9fs_stat_init(V9fsStat *stat) 114160ce86c7SWei Liu { 114260ce86c7SWei Liu v9fs_string_init(&stat->name); 114360ce86c7SWei Liu v9fs_string_init(&stat->uid); 114460ce86c7SWei Liu v9fs_string_init(&stat->gid); 114560ce86c7SWei Liu v9fs_string_init(&stat->muid); 114660ce86c7SWei Liu v9fs_string_init(&stat->extension); 114760ce86c7SWei Liu } 114860ce86c7SWei Liu 114960ce86c7SWei Liu static void v9fs_stat_free(V9fsStat *stat) 115060ce86c7SWei Liu { 115160ce86c7SWei Liu v9fs_string_free(&stat->name); 115260ce86c7SWei Liu v9fs_string_free(&stat->uid); 115360ce86c7SWei Liu v9fs_string_free(&stat->gid); 115460ce86c7SWei Liu v9fs_string_free(&stat->muid); 115560ce86c7SWei Liu v9fs_string_free(&stat->extension); 115660ce86c7SWei Liu } 115760ce86c7SWei Liu 115860ce86c7SWei Liu static uint32_t stat_to_v9mode(const struct stat *stbuf) 115960ce86c7SWei Liu { 116060ce86c7SWei Liu uint32_t mode; 116160ce86c7SWei Liu 116260ce86c7SWei Liu mode = stbuf->st_mode & 0777; 116360ce86c7SWei Liu if (S_ISDIR(stbuf->st_mode)) { 116460ce86c7SWei Liu mode |= P9_STAT_MODE_DIR; 116560ce86c7SWei Liu } 116660ce86c7SWei Liu 116760ce86c7SWei Liu if (S_ISLNK(stbuf->st_mode)) { 116860ce86c7SWei Liu mode |= P9_STAT_MODE_SYMLINK; 116960ce86c7SWei Liu } 117060ce86c7SWei Liu 117160ce86c7SWei Liu if (S_ISSOCK(stbuf->st_mode)) { 117260ce86c7SWei Liu mode |= P9_STAT_MODE_SOCKET; 117360ce86c7SWei Liu } 117460ce86c7SWei Liu 117560ce86c7SWei Liu if (S_ISFIFO(stbuf->st_mode)) { 117660ce86c7SWei Liu mode |= P9_STAT_MODE_NAMED_PIPE; 117760ce86c7SWei Liu } 117860ce86c7SWei Liu 117960ce86c7SWei Liu if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { 118060ce86c7SWei Liu mode |= P9_STAT_MODE_DEVICE; 118160ce86c7SWei Liu } 118260ce86c7SWei Liu 118360ce86c7SWei Liu if (stbuf->st_mode & S_ISUID) { 118460ce86c7SWei Liu mode |= P9_STAT_MODE_SETUID; 118560ce86c7SWei Liu } 118660ce86c7SWei Liu 118760ce86c7SWei Liu if (stbuf->st_mode & S_ISGID) { 118860ce86c7SWei Liu mode |= P9_STAT_MODE_SETGID; 118960ce86c7SWei Liu } 119060ce86c7SWei Liu 119160ce86c7SWei Liu if (stbuf->st_mode & S_ISVTX) { 119260ce86c7SWei Liu mode |= P9_STAT_MODE_SETVTX; 119360ce86c7SWei Liu } 119460ce86c7SWei Liu 119560ce86c7SWei Liu return mode; 119660ce86c7SWei Liu } 119760ce86c7SWei Liu 11986069537fSJan Dakinevich static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, 11996069537fSJan Dakinevich const char *basename, 120060ce86c7SWei Liu const struct stat *stbuf, 120160ce86c7SWei Liu V9fsStat *v9stat) 120260ce86c7SWei Liu { 120360ce86c7SWei Liu int err; 120460ce86c7SWei Liu 120560ce86c7SWei Liu memset(v9stat, 0, sizeof(*v9stat)); 120660ce86c7SWei Liu 12073b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, stbuf, &v9stat->qid); 12083b5ee9e8SAntonios Motakis if (err < 0) { 12093b5ee9e8SAntonios Motakis return err; 12103b5ee9e8SAntonios Motakis } 121160ce86c7SWei Liu v9stat->mode = stat_to_v9mode(stbuf); 121260ce86c7SWei Liu v9stat->atime = stbuf->st_atime; 121360ce86c7SWei Liu v9stat->mtime = stbuf->st_mtime; 121460ce86c7SWei Liu v9stat->length = stbuf->st_size; 121560ce86c7SWei Liu 1216abdf0086SGreg Kurz v9fs_string_free(&v9stat->uid); 1217abdf0086SGreg Kurz v9fs_string_free(&v9stat->gid); 1218abdf0086SGreg Kurz v9fs_string_free(&v9stat->muid); 121960ce86c7SWei Liu 122060ce86c7SWei Liu v9stat->n_uid = stbuf->st_uid; 122160ce86c7SWei Liu v9stat->n_gid = stbuf->st_gid; 122260ce86c7SWei Liu v9stat->n_muid = 0; 122360ce86c7SWei Liu 1224abdf0086SGreg Kurz v9fs_string_free(&v9stat->extension); 122560ce86c7SWei Liu 122660ce86c7SWei Liu if (v9stat->mode & P9_STAT_MODE_SYMLINK) { 12276069537fSJan Dakinevich err = v9fs_co_readlink(pdu, path, &v9stat->extension); 122860ce86c7SWei Liu if (err < 0) { 122960ce86c7SWei Liu return err; 123060ce86c7SWei Liu } 123160ce86c7SWei Liu } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { 123260ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%c %u %u", 123360ce86c7SWei Liu S_ISCHR(stbuf->st_mode) ? 'c' : 'b', 123460ce86c7SWei Liu major(stbuf->st_rdev), minor(stbuf->st_rdev)); 123560ce86c7SWei Liu } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { 123660ce86c7SWei Liu v9fs_string_sprintf(&v9stat->extension, "%s %lu", 123760ce86c7SWei Liu "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); 123860ce86c7SWei Liu } 123960ce86c7SWei Liu 12406069537fSJan Dakinevich v9fs_string_sprintf(&v9stat->name, "%s", basename); 124160ce86c7SWei Liu 124260ce86c7SWei Liu v9stat->size = 61 + 124360ce86c7SWei Liu v9fs_string_size(&v9stat->name) + 124460ce86c7SWei Liu v9fs_string_size(&v9stat->uid) + 124560ce86c7SWei Liu v9fs_string_size(&v9stat->gid) + 124660ce86c7SWei Liu v9fs_string_size(&v9stat->muid) + 124760ce86c7SWei Liu v9fs_string_size(&v9stat->extension); 124860ce86c7SWei Liu return 0; 124960ce86c7SWei Liu } 125060ce86c7SWei Liu 125160ce86c7SWei Liu #define P9_STATS_MODE 0x00000001ULL 125260ce86c7SWei Liu #define P9_STATS_NLINK 0x00000002ULL 125360ce86c7SWei Liu #define P9_STATS_UID 0x00000004ULL 125460ce86c7SWei Liu #define P9_STATS_GID 0x00000008ULL 125560ce86c7SWei Liu #define P9_STATS_RDEV 0x00000010ULL 125660ce86c7SWei Liu #define P9_STATS_ATIME 0x00000020ULL 125760ce86c7SWei Liu #define P9_STATS_MTIME 0x00000040ULL 125860ce86c7SWei Liu #define P9_STATS_CTIME 0x00000080ULL 125960ce86c7SWei Liu #define P9_STATS_INO 0x00000100ULL 126060ce86c7SWei Liu #define P9_STATS_SIZE 0x00000200ULL 126160ce86c7SWei Liu #define P9_STATS_BLOCKS 0x00000400ULL 126260ce86c7SWei Liu 126360ce86c7SWei Liu #define P9_STATS_BTIME 0x00000800ULL 126460ce86c7SWei Liu #define P9_STATS_GEN 0x00001000ULL 126560ce86c7SWei Liu #define P9_STATS_DATA_VERSION 0x00002000ULL 126660ce86c7SWei Liu 126760ce86c7SWei Liu #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ 126860ce86c7SWei Liu #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ 126960ce86c7SWei Liu 127060ce86c7SWei Liu 1271b565bccbSChristian Schoenebeck /** 1272b565bccbSChristian Schoenebeck * Convert host filesystem's block size into an appropriate block size for 1273b565bccbSChristian Schoenebeck * 9p client (guest OS side). The value returned suggests an "optimum" block 1274b565bccbSChristian Schoenebeck * size for 9p I/O, i.e. to maximize performance. 1275b565bccbSChristian Schoenebeck * 1276b565bccbSChristian Schoenebeck * @pdu: 9p client request 1277b565bccbSChristian Schoenebeck * @blksize: host filesystem's block size 1278b565bccbSChristian Schoenebeck */ 1279b565bccbSChristian Schoenebeck static int32_t blksize_to_iounit(const V9fsPDU *pdu, int32_t blksize) 1280669ced09SChristian Schoenebeck { 1281669ced09SChristian Schoenebeck int32_t iounit = 0; 1282669ced09SChristian Schoenebeck V9fsState *s = pdu->s; 1283669ced09SChristian Schoenebeck 1284669ced09SChristian Schoenebeck /* 1285b565bccbSChristian Schoenebeck * iounit should be multiples of blksize (host filesystem block size) 1286669ced09SChristian Schoenebeck * as well as less than (client msize - P9_IOHDRSZ) 1287669ced09SChristian Schoenebeck */ 1288b565bccbSChristian Schoenebeck if (blksize) { 128904a7f9e5SChristian Schoenebeck iounit = QEMU_ALIGN_DOWN(s->msize - P9_IOHDRSZ, blksize); 1290669ced09SChristian Schoenebeck } 1291669ced09SChristian Schoenebeck if (!iounit) { 1292669ced09SChristian Schoenebeck iounit = s->msize - P9_IOHDRSZ; 1293669ced09SChristian Schoenebeck } 1294669ced09SChristian Schoenebeck return iounit; 1295669ced09SChristian Schoenebeck } 1296669ced09SChristian Schoenebeck 1297b565bccbSChristian Schoenebeck static int32_t stat_to_iounit(const V9fsPDU *pdu, const struct stat *stbuf) 1298b565bccbSChristian Schoenebeck { 1299b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, stbuf->st_blksize); 1300b565bccbSChristian Schoenebeck } 1301b565bccbSChristian Schoenebeck 13023b5ee9e8SAntonios Motakis static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, 130360ce86c7SWei Liu V9fsStatDotl *v9lstat) 130460ce86c7SWei Liu { 130560ce86c7SWei Liu memset(v9lstat, 0, sizeof(*v9lstat)); 130660ce86c7SWei Liu 130760ce86c7SWei Liu v9lstat->st_mode = stbuf->st_mode; 130860ce86c7SWei Liu v9lstat->st_nlink = stbuf->st_nlink; 130960ce86c7SWei Liu v9lstat->st_uid = stbuf->st_uid; 131060ce86c7SWei Liu v9lstat->st_gid = stbuf->st_gid; 131160ce86c7SWei Liu v9lstat->st_rdev = stbuf->st_rdev; 131260ce86c7SWei Liu v9lstat->st_size = stbuf->st_size; 1313669ced09SChristian Schoenebeck v9lstat->st_blksize = stat_to_iounit(pdu, stbuf); 131460ce86c7SWei Liu v9lstat->st_blocks = stbuf->st_blocks; 131560ce86c7SWei Liu v9lstat->st_atime_sec = stbuf->st_atime; 131660ce86c7SWei Liu v9lstat->st_mtime_sec = stbuf->st_mtime; 131760ce86c7SWei Liu v9lstat->st_ctime_sec = stbuf->st_ctime; 1318*f41db099SKeno Fischer #ifdef CONFIG_DARWIN 1319*f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atimespec.tv_nsec; 1320*f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtimespec.tv_nsec; 1321*f41db099SKeno Fischer v9lstat->st_ctime_nsec = stbuf->st_ctimespec.tv_nsec; 1322*f41db099SKeno Fischer #else 1323*f41db099SKeno Fischer v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; 1324*f41db099SKeno Fischer v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; 132560ce86c7SWei Liu v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; 1326*f41db099SKeno Fischer #endif 132760ce86c7SWei Liu /* Currently we only support BASIC fields in stat */ 132860ce86c7SWei Liu v9lstat->st_result_mask = P9_STATS_BASIC; 132960ce86c7SWei Liu 13303b5ee9e8SAntonios Motakis return stat_to_qid(pdu, stbuf, &v9lstat->qid); 133160ce86c7SWei Liu } 133260ce86c7SWei Liu 133360ce86c7SWei Liu static void print_sg(struct iovec *sg, int cnt) 133460ce86c7SWei Liu { 133560ce86c7SWei Liu int i; 133660ce86c7SWei Liu 133760ce86c7SWei Liu printf("sg[%d]: {", cnt); 133860ce86c7SWei Liu for (i = 0; i < cnt; i++) { 133960ce86c7SWei Liu if (i) { 134060ce86c7SWei Liu printf(", "); 134160ce86c7SWei Liu } 134260ce86c7SWei Liu printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); 134360ce86c7SWei Liu } 134460ce86c7SWei Liu printf("}\n"); 134560ce86c7SWei Liu } 134660ce86c7SWei Liu 134760ce86c7SWei Liu /* Will call this only for path name based fid */ 134860ce86c7SWei Liu static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) 134960ce86c7SWei Liu { 135060ce86c7SWei Liu V9fsPath str; 135160ce86c7SWei Liu v9fs_path_init(&str); 135260ce86c7SWei Liu v9fs_path_copy(&str, dst); 1353e3e83f2eSGreg Kurz v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); 135460ce86c7SWei Liu v9fs_path_free(&str); 135560ce86c7SWei Liu } 135660ce86c7SWei Liu 135760ce86c7SWei Liu static inline bool is_ro_export(FsContext *ctx) 135860ce86c7SWei Liu { 135960ce86c7SWei Liu return ctx->export_flags & V9FS_RDONLY; 136060ce86c7SWei Liu } 136160ce86c7SWei Liu 13628440e22eSGreg Kurz static void coroutine_fn v9fs_version(void *opaque) 136360ce86c7SWei Liu { 136460ce86c7SWei Liu ssize_t err; 136560ce86c7SWei Liu V9fsPDU *pdu = opaque; 136660ce86c7SWei Liu V9fsState *s = pdu->s; 136760ce86c7SWei Liu V9fsString version; 136860ce86c7SWei Liu size_t offset = 7; 136960ce86c7SWei Liu 137060ce86c7SWei Liu v9fs_string_init(&version); 137160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); 137260ce86c7SWei Liu if (err < 0) { 137360ce86c7SWei Liu goto out; 137460ce86c7SWei Liu } 137560ce86c7SWei Liu trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); 137660ce86c7SWei Liu 137760ce86c7SWei Liu virtfs_reset(pdu); 137860ce86c7SWei Liu 137960ce86c7SWei Liu if (!strcmp(version.data, "9P2000.u")) { 138060ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000U; 138160ce86c7SWei Liu } else if (!strcmp(version.data, "9P2000.L")) { 138260ce86c7SWei Liu s->proto_version = V9FS_PROTO_2000L; 138360ce86c7SWei Liu } else { 138460ce86c7SWei Liu v9fs_string_sprintf(&version, "unknown"); 1385e16453a3SChristian Schoenebeck /* skip min. msize check, reporting invalid version has priority */ 1386e16453a3SChristian Schoenebeck goto marshal; 138760ce86c7SWei Liu } 138860ce86c7SWei Liu 1389e16453a3SChristian Schoenebeck if (s->msize < P9_MIN_MSIZE) { 1390e16453a3SChristian Schoenebeck err = -EMSGSIZE; 1391e16453a3SChristian Schoenebeck error_report( 1392e16453a3SChristian Schoenebeck "9pfs: Client requested msize < minimum msize (" 1393e16453a3SChristian Schoenebeck stringify(P9_MIN_MSIZE) ") supported by this server." 1394e16453a3SChristian Schoenebeck ); 1395e16453a3SChristian Schoenebeck goto out; 1396e16453a3SChristian Schoenebeck } 1397e16453a3SChristian Schoenebeck 139862777d82SChristian Schoenebeck /* 8192 is the default msize of Linux clients */ 1399c418f935SChristian Schoenebeck if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { 140062777d82SChristian Schoenebeck warn_report_once( 140162777d82SChristian Schoenebeck "9p: degraded performance: a reasonable high msize should be " 140262777d82SChristian Schoenebeck "chosen on client/guest side (chosen msize is <= 8192). See " 140362777d82SChristian Schoenebeck "https://wiki.qemu.org/Documentation/9psetup#msize for details." 140462777d82SChristian Schoenebeck ); 140562777d82SChristian Schoenebeck } 140662777d82SChristian Schoenebeck 1407e16453a3SChristian Schoenebeck marshal: 140860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "ds", s->msize, &version); 140960ce86c7SWei Liu if (err < 0) { 141060ce86c7SWei Liu goto out; 141160ce86c7SWei Liu } 1412403a905bSPhilippe Mathieu-Daudé err += offset; 141360ce86c7SWei Liu trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); 141460ce86c7SWei Liu out: 1415403a905bSPhilippe Mathieu-Daudé pdu_complete(pdu, err); 141660ce86c7SWei Liu v9fs_string_free(&version); 141760ce86c7SWei Liu } 141860ce86c7SWei Liu 14198440e22eSGreg Kurz static void coroutine_fn v9fs_attach(void *opaque) 142060ce86c7SWei Liu { 142160ce86c7SWei Liu V9fsPDU *pdu = opaque; 142260ce86c7SWei Liu V9fsState *s = pdu->s; 142360ce86c7SWei Liu int32_t fid, afid, n_uname; 142460ce86c7SWei Liu V9fsString uname, aname; 142560ce86c7SWei Liu V9fsFidState *fidp; 142660ce86c7SWei Liu size_t offset = 7; 142760ce86c7SWei Liu V9fsQID qid; 142860ce86c7SWei Liu ssize_t err; 142911024375SChristian Schoenebeck struct stat stbuf; 143060ce86c7SWei Liu 143160ce86c7SWei Liu v9fs_string_init(&uname); 143260ce86c7SWei Liu v9fs_string_init(&aname); 143360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddssd", &fid, 143460ce86c7SWei Liu &afid, &uname, &aname, &n_uname); 143560ce86c7SWei Liu if (err < 0) { 143660ce86c7SWei Liu goto out_nofid; 143760ce86c7SWei Liu } 143860ce86c7SWei Liu trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); 143960ce86c7SWei Liu 144060ce86c7SWei Liu fidp = alloc_fid(s, fid); 144160ce86c7SWei Liu if (fidp == NULL) { 144260ce86c7SWei Liu err = -EINVAL; 144360ce86c7SWei Liu goto out_nofid; 144460ce86c7SWei Liu } 144560ce86c7SWei Liu fidp->uid = n_uname; 144660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); 144760ce86c7SWei Liu if (err < 0) { 144860ce86c7SWei Liu err = -EINVAL; 144960ce86c7SWei Liu clunk_fid(s, fid); 145060ce86c7SWei Liu goto out; 145160ce86c7SWei Liu } 145211024375SChristian Schoenebeck err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 145311024375SChristian Schoenebeck if (err < 0) { 145411024375SChristian Schoenebeck err = -EINVAL; 145511024375SChristian Schoenebeck clunk_fid(s, fid); 145611024375SChristian Schoenebeck goto out; 145711024375SChristian Schoenebeck } 145811024375SChristian Schoenebeck err = stat_to_qid(pdu, &stbuf, &qid); 145960ce86c7SWei Liu if (err < 0) { 146060ce86c7SWei Liu err = -EINVAL; 146160ce86c7SWei Liu clunk_fid(s, fid); 146260ce86c7SWei Liu goto out; 146360ce86c7SWei Liu } 1464fe44dc91SAshijeet Acharya 1465fe44dc91SAshijeet Acharya /* 1466fe44dc91SAshijeet Acharya * disable migration if we haven't done already. 1467fe44dc91SAshijeet Acharya * attach could get called multiple times for the same export. 1468fe44dc91SAshijeet Acharya */ 1469fe44dc91SAshijeet Acharya if (!s->migration_blocker) { 1470fe44dc91SAshijeet Acharya error_setg(&s->migration_blocker, 1471fe44dc91SAshijeet Acharya "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", 1472fe44dc91SAshijeet Acharya s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); 14739261ef5eSMarkus Armbruster err = migrate_add_blocker(s->migration_blocker, NULL); 14749261ef5eSMarkus Armbruster if (err < 0) { 1475fe44dc91SAshijeet Acharya error_free(s->migration_blocker); 1476fe44dc91SAshijeet Acharya s->migration_blocker = NULL; 1477fe44dc91SAshijeet Acharya clunk_fid(s, fid); 1478fe44dc91SAshijeet Acharya goto out; 1479fe44dc91SAshijeet Acharya } 1480fe44dc91SAshijeet Acharya s->root_fid = fid; 1481fe44dc91SAshijeet Acharya } 1482fe44dc91SAshijeet Acharya 148360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 148460ce86c7SWei Liu if (err < 0) { 148560ce86c7SWei Liu clunk_fid(s, fid); 148660ce86c7SWei Liu goto out; 148760ce86c7SWei Liu } 148860ce86c7SWei Liu err += offset; 1489fe44dc91SAshijeet Acharya 149011024375SChristian Schoenebeck memcpy(&s->root_st, &stbuf, sizeof(stbuf)); 149160ce86c7SWei Liu trace_v9fs_attach_return(pdu->tag, pdu->id, 149260ce86c7SWei Liu qid.type, qid.version, qid.path); 149360ce86c7SWei Liu out: 149460ce86c7SWei Liu put_fid(pdu, fidp); 149560ce86c7SWei Liu out_nofid: 149660ce86c7SWei Liu pdu_complete(pdu, err); 149760ce86c7SWei Liu v9fs_string_free(&uname); 149860ce86c7SWei Liu v9fs_string_free(&aname); 149960ce86c7SWei Liu } 150060ce86c7SWei Liu 15018440e22eSGreg Kurz static void coroutine_fn v9fs_stat(void *opaque) 150260ce86c7SWei Liu { 150360ce86c7SWei Liu int32_t fid; 150460ce86c7SWei Liu V9fsStat v9stat; 150560ce86c7SWei Liu ssize_t err = 0; 150660ce86c7SWei Liu size_t offset = 7; 150760ce86c7SWei Liu struct stat stbuf; 150860ce86c7SWei Liu V9fsFidState *fidp; 150960ce86c7SWei Liu V9fsPDU *pdu = opaque; 15106069537fSJan Dakinevich char *basename; 151160ce86c7SWei Liu 151260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 151360ce86c7SWei Liu if (err < 0) { 151460ce86c7SWei Liu goto out_nofid; 151560ce86c7SWei Liu } 151660ce86c7SWei Liu trace_v9fs_stat(pdu->tag, pdu->id, fid); 151760ce86c7SWei Liu 151860ce86c7SWei Liu fidp = get_fid(pdu, fid); 151960ce86c7SWei Liu if (fidp == NULL) { 152060ce86c7SWei Liu err = -ENOENT; 152160ce86c7SWei Liu goto out_nofid; 152260ce86c7SWei Liu } 152360ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 152460ce86c7SWei Liu if (err < 0) { 152560ce86c7SWei Liu goto out; 152660ce86c7SWei Liu } 15276069537fSJan Dakinevich basename = g_path_get_basename(fidp->path.data); 15286069537fSJan Dakinevich err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); 15296069537fSJan Dakinevich g_free(basename); 153060ce86c7SWei Liu if (err < 0) { 153160ce86c7SWei Liu goto out; 153260ce86c7SWei Liu } 153360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); 153460ce86c7SWei Liu if (err < 0) { 153560ce86c7SWei Liu v9fs_stat_free(&v9stat); 153660ce86c7SWei Liu goto out; 153760ce86c7SWei Liu } 153860ce86c7SWei Liu trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, 153960ce86c7SWei Liu v9stat.atime, v9stat.mtime, v9stat.length); 154060ce86c7SWei Liu err += offset; 154160ce86c7SWei Liu v9fs_stat_free(&v9stat); 154260ce86c7SWei Liu out: 154360ce86c7SWei Liu put_fid(pdu, fidp); 154460ce86c7SWei Liu out_nofid: 154560ce86c7SWei Liu pdu_complete(pdu, err); 154660ce86c7SWei Liu } 154760ce86c7SWei Liu 15488440e22eSGreg Kurz static void coroutine_fn v9fs_getattr(void *opaque) 154960ce86c7SWei Liu { 155060ce86c7SWei Liu int32_t fid; 155160ce86c7SWei Liu size_t offset = 7; 155260ce86c7SWei Liu ssize_t retval = 0; 155360ce86c7SWei Liu struct stat stbuf; 155460ce86c7SWei Liu V9fsFidState *fidp; 155560ce86c7SWei Liu uint64_t request_mask; 155660ce86c7SWei Liu V9fsStatDotl v9stat_dotl; 155760ce86c7SWei Liu V9fsPDU *pdu = opaque; 155860ce86c7SWei Liu 155960ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); 156060ce86c7SWei Liu if (retval < 0) { 156160ce86c7SWei Liu goto out_nofid; 156260ce86c7SWei Liu } 156360ce86c7SWei Liu trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); 156460ce86c7SWei Liu 156560ce86c7SWei Liu fidp = get_fid(pdu, fid); 156660ce86c7SWei Liu if (fidp == NULL) { 156760ce86c7SWei Liu retval = -ENOENT; 156860ce86c7SWei Liu goto out_nofid; 156960ce86c7SWei Liu } 157060ce86c7SWei Liu /* 157160ce86c7SWei Liu * Currently we only support BASIC fields in stat, so there is no 157260ce86c7SWei Liu * need to look at request_mask. 157360ce86c7SWei Liu */ 157460ce86c7SWei Liu retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 157560ce86c7SWei Liu if (retval < 0) { 157660ce86c7SWei Liu goto out; 157760ce86c7SWei Liu } 15783b5ee9e8SAntonios Motakis retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); 15793b5ee9e8SAntonios Motakis if (retval < 0) { 15803b5ee9e8SAntonios Motakis goto out; 15813b5ee9e8SAntonios Motakis } 158260ce86c7SWei Liu 158360ce86c7SWei Liu /* fill st_gen if requested and supported by underlying fs */ 158460ce86c7SWei Liu if (request_mask & P9_STATS_GEN) { 158560ce86c7SWei Liu retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); 158660ce86c7SWei Liu switch (retval) { 158760ce86c7SWei Liu case 0: 158860ce86c7SWei Liu /* we have valid st_gen: update result mask */ 158960ce86c7SWei Liu v9stat_dotl.st_result_mask |= P9_STATS_GEN; 159060ce86c7SWei Liu break; 159160ce86c7SWei Liu case -EINTR: 159260ce86c7SWei Liu /* request cancelled, e.g. by Tflush */ 159360ce86c7SWei Liu goto out; 159460ce86c7SWei Liu default: 159560ce86c7SWei Liu /* failed to get st_gen: not fatal, ignore */ 159660ce86c7SWei Liu break; 159760ce86c7SWei Liu } 159860ce86c7SWei Liu } 159960ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); 160060ce86c7SWei Liu if (retval < 0) { 160160ce86c7SWei Liu goto out; 160260ce86c7SWei Liu } 160360ce86c7SWei Liu retval += offset; 160460ce86c7SWei Liu trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, 160560ce86c7SWei Liu v9stat_dotl.st_mode, v9stat_dotl.st_uid, 160660ce86c7SWei Liu v9stat_dotl.st_gid); 160760ce86c7SWei Liu out: 160860ce86c7SWei Liu put_fid(pdu, fidp); 160960ce86c7SWei Liu out_nofid: 161060ce86c7SWei Liu pdu_complete(pdu, retval); 161160ce86c7SWei Liu } 161260ce86c7SWei Liu 161360ce86c7SWei Liu /* Attribute flags */ 161460ce86c7SWei Liu #define P9_ATTR_MODE (1 << 0) 161560ce86c7SWei Liu #define P9_ATTR_UID (1 << 1) 161660ce86c7SWei Liu #define P9_ATTR_GID (1 << 2) 161760ce86c7SWei Liu #define P9_ATTR_SIZE (1 << 3) 161860ce86c7SWei Liu #define P9_ATTR_ATIME (1 << 4) 161960ce86c7SWei Liu #define P9_ATTR_MTIME (1 << 5) 162060ce86c7SWei Liu #define P9_ATTR_CTIME (1 << 6) 162160ce86c7SWei Liu #define P9_ATTR_ATIME_SET (1 << 7) 162260ce86c7SWei Liu #define P9_ATTR_MTIME_SET (1 << 8) 162360ce86c7SWei Liu 162460ce86c7SWei Liu #define P9_ATTR_MASK 127 162560ce86c7SWei Liu 16268440e22eSGreg Kurz static void coroutine_fn v9fs_setattr(void *opaque) 162760ce86c7SWei Liu { 162860ce86c7SWei Liu int err = 0; 162960ce86c7SWei Liu int32_t fid; 163060ce86c7SWei Liu V9fsFidState *fidp; 163160ce86c7SWei Liu size_t offset = 7; 163260ce86c7SWei Liu V9fsIattr v9iattr; 163360ce86c7SWei Liu V9fsPDU *pdu = opaque; 163460ce86c7SWei Liu 163560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); 163660ce86c7SWei Liu if (err < 0) { 163760ce86c7SWei Liu goto out_nofid; 163860ce86c7SWei Liu } 163960ce86c7SWei Liu 16408f9c64bfSGreg Kurz trace_v9fs_setattr(pdu->tag, pdu->id, fid, 16418f9c64bfSGreg Kurz v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, 16428f9c64bfSGreg Kurz v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); 16438f9c64bfSGreg Kurz 164460ce86c7SWei Liu fidp = get_fid(pdu, fid); 164560ce86c7SWei Liu if (fidp == NULL) { 164660ce86c7SWei Liu err = -EINVAL; 164760ce86c7SWei Liu goto out_nofid; 164860ce86c7SWei Liu } 164960ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MODE) { 165060ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); 165160ce86c7SWei Liu if (err < 0) { 165260ce86c7SWei Liu goto out; 165360ce86c7SWei Liu } 165460ce86c7SWei Liu } 165560ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { 165660ce86c7SWei Liu struct timespec times[2]; 165760ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME) { 165860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_ATIME_SET) { 165960ce86c7SWei Liu times[0].tv_sec = v9iattr.atime_sec; 166060ce86c7SWei Liu times[0].tv_nsec = v9iattr.atime_nsec; 166160ce86c7SWei Liu } else { 166260ce86c7SWei Liu times[0].tv_nsec = UTIME_NOW; 166360ce86c7SWei Liu } 166460ce86c7SWei Liu } else { 166560ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 166660ce86c7SWei Liu } 166760ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME) { 166860ce86c7SWei Liu if (v9iattr.valid & P9_ATTR_MTIME_SET) { 166960ce86c7SWei Liu times[1].tv_sec = v9iattr.mtime_sec; 167060ce86c7SWei Liu times[1].tv_nsec = v9iattr.mtime_nsec; 167160ce86c7SWei Liu } else { 167260ce86c7SWei Liu times[1].tv_nsec = UTIME_NOW; 167360ce86c7SWei Liu } 167460ce86c7SWei Liu } else { 167560ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 167660ce86c7SWei Liu } 167760ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 167860ce86c7SWei Liu if (err < 0) { 167960ce86c7SWei Liu goto out; 168060ce86c7SWei Liu } 168160ce86c7SWei Liu } 168260ce86c7SWei Liu /* 168360ce86c7SWei Liu * If the only valid entry in iattr is ctime we can call 168460ce86c7SWei Liu * chown(-1,-1) to update the ctime of the file 168560ce86c7SWei Liu */ 168660ce86c7SWei Liu if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || 168760ce86c7SWei Liu ((v9iattr.valid & P9_ATTR_CTIME) 168860ce86c7SWei Liu && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { 168960ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_UID)) { 169060ce86c7SWei Liu v9iattr.uid = -1; 169160ce86c7SWei Liu } 169260ce86c7SWei Liu if (!(v9iattr.valid & P9_ATTR_GID)) { 169360ce86c7SWei Liu v9iattr.gid = -1; 169460ce86c7SWei Liu } 169560ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, 169660ce86c7SWei Liu v9iattr.gid); 169760ce86c7SWei Liu if (err < 0) { 169860ce86c7SWei Liu goto out; 169960ce86c7SWei Liu } 170060ce86c7SWei Liu } 170160ce86c7SWei Liu if (v9iattr.valid & (P9_ATTR_SIZE)) { 170260ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); 170360ce86c7SWei Liu if (err < 0) { 170460ce86c7SWei Liu goto out; 170560ce86c7SWei Liu } 170660ce86c7SWei Liu } 170760ce86c7SWei Liu err = offset; 17088f9c64bfSGreg Kurz trace_v9fs_setattr_return(pdu->tag, pdu->id); 170960ce86c7SWei Liu out: 171060ce86c7SWei Liu put_fid(pdu, fidp); 171160ce86c7SWei Liu out_nofid: 171260ce86c7SWei Liu pdu_complete(pdu, err); 171360ce86c7SWei Liu } 171460ce86c7SWei Liu 171560ce86c7SWei Liu static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) 171660ce86c7SWei Liu { 171760ce86c7SWei Liu int i; 171860ce86c7SWei Liu ssize_t err; 171960ce86c7SWei Liu size_t offset = 7; 172060ce86c7SWei Liu 172160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "w", nwnames); 172260ce86c7SWei Liu if (err < 0) { 172360ce86c7SWei Liu return err; 172460ce86c7SWei Liu } 172560ce86c7SWei Liu offset += err; 172660ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 172760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qids[i]); 172860ce86c7SWei Liu if (err < 0) { 172960ce86c7SWei Liu return err; 173060ce86c7SWei Liu } 173160ce86c7SWei Liu offset += err; 173260ce86c7SWei Liu } 173360ce86c7SWei Liu return offset; 173460ce86c7SWei Liu } 173560ce86c7SWei Liu 1736fff39a7aSGreg Kurz static bool name_is_illegal(const char *name) 1737fff39a7aSGreg Kurz { 1738fff39a7aSGreg Kurz return !*name || strchr(name, '/') != NULL; 1739fff39a7aSGreg Kurz } 1740fff39a7aSGreg Kurz 1741f22cad42SChristian Schoenebeck static bool same_stat_id(const struct stat *a, const struct stat *b) 174256f101ecSGreg Kurz { 1743f22cad42SChristian Schoenebeck return a->st_dev == b->st_dev && a->st_ino == b->st_ino; 174456f101ecSGreg Kurz } 174556f101ecSGreg Kurz 17468440e22eSGreg Kurz static void coroutine_fn v9fs_walk(void *opaque) 174760ce86c7SWei Liu { 174860ce86c7SWei Liu int name_idx; 1749869605b5SChristian Schoenebeck g_autofree V9fsQID *qids = NULL; 175060ce86c7SWei Liu int i, err = 0; 17517e985780SChristian Schoenebeck V9fsPath dpath, path; 17527e985780SChristian Schoenebeck P9ARRAY_REF(V9fsPath) pathes = NULL; 175360ce86c7SWei Liu uint16_t nwnames; 1754869605b5SChristian Schoenebeck struct stat stbuf, fidst; 1755869605b5SChristian Schoenebeck g_autofree struct stat *stbufs = NULL; 175660ce86c7SWei Liu size_t offset = 7; 175760ce86c7SWei Liu int32_t fid, newfid; 17587e985780SChristian Schoenebeck P9ARRAY_REF(V9fsString) wnames = NULL; 175960ce86c7SWei Liu V9fsFidState *fidp; 176060ce86c7SWei Liu V9fsFidState *newfidp = NULL; 176160ce86c7SWei Liu V9fsPDU *pdu = opaque; 176260ce86c7SWei Liu V9fsState *s = pdu->s; 176356f101ecSGreg Kurz V9fsQID qid; 176460ce86c7SWei Liu 176560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); 176660ce86c7SWei Liu if (err < 0) { 176760ce86c7SWei Liu pdu_complete(pdu, err); 176860ce86c7SWei Liu return ; 176960ce86c7SWei Liu } 177060ce86c7SWei Liu offset += err; 177160ce86c7SWei Liu 177260ce86c7SWei Liu trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); 177360ce86c7SWei Liu 1774232a4d2cSChristian Schoenebeck if (nwnames > P9_MAXWELEM) { 1775232a4d2cSChristian Schoenebeck err = -EINVAL; 1776232a4d2cSChristian Schoenebeck goto out_nofid; 1777232a4d2cSChristian Schoenebeck } 1778232a4d2cSChristian Schoenebeck if (nwnames) { 17797e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsString, wnames, nwnames); 17801923923bSGreg Kurz qids = g_new0(V9fsQID, nwnames); 17818d6cb100SChristian Schoenebeck stbufs = g_new0(struct stat, nwnames); 17827e985780SChristian Schoenebeck P9ARRAY_NEW(V9fsPath, pathes, nwnames); 178360ce86c7SWei Liu for (i = 0; i < nwnames; i++) { 178460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); 178560ce86c7SWei Liu if (err < 0) { 178660ce86c7SWei Liu goto out_nofid; 178760ce86c7SWei Liu } 1788fff39a7aSGreg Kurz if (name_is_illegal(wnames[i].data)) { 1789fff39a7aSGreg Kurz err = -ENOENT; 1790fff39a7aSGreg Kurz goto out_nofid; 1791fff39a7aSGreg Kurz } 179260ce86c7SWei Liu offset += err; 179360ce86c7SWei Liu } 179460ce86c7SWei Liu } 179560ce86c7SWei Liu fidp = get_fid(pdu, fid); 179660ce86c7SWei Liu if (fidp == NULL) { 179760ce86c7SWei Liu err = -ENOENT; 179860ce86c7SWei Liu goto out_nofid; 179960ce86c7SWei Liu } 180056f101ecSGreg Kurz 180113fd08e6SGreg Kurz v9fs_path_init(&dpath); 180213fd08e6SGreg Kurz v9fs_path_init(&path); 180360ce86c7SWei Liu /* 18048d6cb100SChristian Schoenebeck * Both dpath and path initially point to fidp. 180560ce86c7SWei Liu * Needed to handle request with nwnames == 0 180660ce86c7SWei Liu */ 180760ce86c7SWei Liu v9fs_path_copy(&dpath, &fidp->path); 180860ce86c7SWei Liu v9fs_path_copy(&path, &fidp->path); 18098d6cb100SChristian Schoenebeck 18108d6cb100SChristian Schoenebeck /* 18118d6cb100SChristian Schoenebeck * To keep latency (i.e. overall execution time for processing this 18128d6cb100SChristian Schoenebeck * Twalk client request) as small as possible, run all the required fs 18138d6cb100SChristian Schoenebeck * driver code altogether inside the following block. 18148d6cb100SChristian Schoenebeck */ 18158d6cb100SChristian Schoenebeck v9fs_co_run_in_worker({ 18168d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18178d6cb100SChristian Schoenebeck err = -EINTR; 18188d6cb100SChristian Schoenebeck break; 18198d6cb100SChristian Schoenebeck } 18208d6cb100SChristian Schoenebeck err = s->ops->lstat(&s->ctx, &dpath, &fidst); 18218d6cb100SChristian Schoenebeck if (err < 0) { 18228d6cb100SChristian Schoenebeck err = -errno; 18238d6cb100SChristian Schoenebeck break; 18248d6cb100SChristian Schoenebeck } 18258d6cb100SChristian Schoenebeck stbuf = fidst; 182660ce86c7SWei Liu for (name_idx = 0; name_idx < nwnames; name_idx++) { 18278d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18288d6cb100SChristian Schoenebeck err = -EINTR; 18298d6cb100SChristian Schoenebeck break; 18308d6cb100SChristian Schoenebeck } 1831f22cad42SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18328d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18338d6cb100SChristian Schoenebeck { 18348d6cb100SChristian Schoenebeck err = s->ops->name_to_path(&s->ctx, &dpath, 183597b1d8fdSChristian Schoenebeck wnames[name_idx].data, 183697b1d8fdSChristian Schoenebeck &pathes[name_idx]); 18378d6cb100SChristian Schoenebeck if (err < 0) { 18388d6cb100SChristian Schoenebeck err = -errno; 18398d6cb100SChristian Schoenebeck break; 18408d6cb100SChristian Schoenebeck } 18418d6cb100SChristian Schoenebeck if (v9fs_request_cancelled(pdu)) { 18428d6cb100SChristian Schoenebeck err = -EINTR; 18438d6cb100SChristian Schoenebeck break; 18448d6cb100SChristian Schoenebeck } 184597b1d8fdSChristian Schoenebeck err = s->ops->lstat(&s->ctx, &pathes[name_idx], &stbuf); 18468d6cb100SChristian Schoenebeck if (err < 0) { 18478d6cb100SChristian Schoenebeck err = -errno; 18488d6cb100SChristian Schoenebeck break; 18498d6cb100SChristian Schoenebeck } 18508d6cb100SChristian Schoenebeck stbufs[name_idx] = stbuf; 185197b1d8fdSChristian Schoenebeck v9fs_path_copy(&dpath, &pathes[name_idx]); 18528d6cb100SChristian Schoenebeck } 18538d6cb100SChristian Schoenebeck } 18548d6cb100SChristian Schoenebeck }); 18558d6cb100SChristian Schoenebeck /* 18568d6cb100SChristian Schoenebeck * Handle all the rest of this Twalk request on main thread ... 18578d6cb100SChristian Schoenebeck */ 185860ce86c7SWei Liu if (err < 0) { 185960ce86c7SWei Liu goto out; 186060ce86c7SWei Liu } 186156f101ecSGreg Kurz 18628d6cb100SChristian Schoenebeck err = stat_to_qid(pdu, &fidst, &qid); 186360ce86c7SWei Liu if (err < 0) { 186460ce86c7SWei Liu goto out; 186560ce86c7SWei Liu } 18668d6cb100SChristian Schoenebeck stbuf = fidst; 18678d6cb100SChristian Schoenebeck 18688d6cb100SChristian Schoenebeck /* reset dpath and path */ 18698d6cb100SChristian Schoenebeck v9fs_path_copy(&dpath, &fidp->path); 18708d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &fidp->path); 18718d6cb100SChristian Schoenebeck 18728d6cb100SChristian Schoenebeck for (name_idx = 0; name_idx < nwnames; name_idx++) { 18738d6cb100SChristian Schoenebeck if (!same_stat_id(&pdu->s->root_st, &stbuf) || 18748d6cb100SChristian Schoenebeck strcmp("..", wnames[name_idx].data)) 18758d6cb100SChristian Schoenebeck { 18768d6cb100SChristian Schoenebeck stbuf = stbufs[name_idx]; 18773b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 18783b5ee9e8SAntonios Motakis if (err < 0) { 18793b5ee9e8SAntonios Motakis goto out; 18803b5ee9e8SAntonios Motakis } 18818d6cb100SChristian Schoenebeck v9fs_path_copy(&path, &pathes[name_idx]); 188260ce86c7SWei Liu v9fs_path_copy(&dpath, &path); 188360ce86c7SWei Liu } 188456f101ecSGreg Kurz memcpy(&qids[name_idx], &qid, sizeof(qid)); 188556f101ecSGreg Kurz } 188660ce86c7SWei Liu if (fid == newfid) { 188749dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 188849dd946bSGreg Kurz err = -EINVAL; 188949dd946bSGreg Kurz goto out; 189049dd946bSGreg Kurz } 18915b3c77aaSGreg Kurz v9fs_path_write_lock(s); 189260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 18935b3c77aaSGreg Kurz v9fs_path_unlock(s); 189460ce86c7SWei Liu } else { 189560ce86c7SWei Liu newfidp = alloc_fid(s, newfid); 189660ce86c7SWei Liu if (newfidp == NULL) { 189760ce86c7SWei Liu err = -EINVAL; 189860ce86c7SWei Liu goto out; 189960ce86c7SWei Liu } 190060ce86c7SWei Liu newfidp->uid = fidp->uid; 190160ce86c7SWei Liu v9fs_path_copy(&newfidp->path, &path); 190260ce86c7SWei Liu } 190360ce86c7SWei Liu err = v9fs_walk_marshal(pdu, nwnames, qids); 190460ce86c7SWei Liu trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); 190560ce86c7SWei Liu out: 190660ce86c7SWei Liu put_fid(pdu, fidp); 190760ce86c7SWei Liu if (newfidp) { 190860ce86c7SWei Liu put_fid(pdu, newfidp); 190960ce86c7SWei Liu } 191060ce86c7SWei Liu v9fs_path_free(&dpath); 191160ce86c7SWei Liu v9fs_path_free(&path); 191260ce86c7SWei Liu out_nofid: 191360ce86c7SWei Liu pdu_complete(pdu, err); 191460ce86c7SWei Liu } 191560ce86c7SWei Liu 19168440e22eSGreg Kurz static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) 191760ce86c7SWei Liu { 191860ce86c7SWei Liu struct statfs stbuf; 1919b565bccbSChristian Schoenebeck int err = v9fs_co_statfs(pdu, path, &stbuf); 192060ce86c7SWei Liu 1921b565bccbSChristian Schoenebeck return blksize_to_iounit(pdu, (err >= 0) ? stbuf.f_bsize : 0); 192260ce86c7SWei Liu } 192360ce86c7SWei Liu 19248440e22eSGreg Kurz static void coroutine_fn v9fs_open(void *opaque) 192560ce86c7SWei Liu { 192660ce86c7SWei Liu int flags; 192760ce86c7SWei Liu int32_t fid; 192860ce86c7SWei Liu int32_t mode; 192960ce86c7SWei Liu V9fsQID qid; 193060ce86c7SWei Liu int iounit = 0; 193160ce86c7SWei Liu ssize_t err = 0; 193260ce86c7SWei Liu size_t offset = 7; 193360ce86c7SWei Liu struct stat stbuf; 193460ce86c7SWei Liu V9fsFidState *fidp; 193560ce86c7SWei Liu V9fsPDU *pdu = opaque; 193660ce86c7SWei Liu V9fsState *s = pdu->s; 193760ce86c7SWei Liu 193860ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 193960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); 194060ce86c7SWei Liu } else { 194160ce86c7SWei Liu uint8_t modebyte; 194260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); 194360ce86c7SWei Liu mode = modebyte; 194460ce86c7SWei Liu } 194560ce86c7SWei Liu if (err < 0) { 194660ce86c7SWei Liu goto out_nofid; 194760ce86c7SWei Liu } 194860ce86c7SWei Liu trace_v9fs_open(pdu->tag, pdu->id, fid, mode); 194960ce86c7SWei Liu 195060ce86c7SWei Liu fidp = get_fid(pdu, fid); 195160ce86c7SWei Liu if (fidp == NULL) { 195260ce86c7SWei Liu err = -ENOENT; 195360ce86c7SWei Liu goto out_nofid; 195460ce86c7SWei Liu } 195549dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 195649dd946bSGreg Kurz err = -EINVAL; 195749dd946bSGreg Kurz goto out; 195849dd946bSGreg Kurz } 195960ce86c7SWei Liu 196060ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 196160ce86c7SWei Liu if (err < 0) { 196260ce86c7SWei Liu goto out; 196360ce86c7SWei Liu } 19643b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 19653b5ee9e8SAntonios Motakis if (err < 0) { 19663b5ee9e8SAntonios Motakis goto out; 19673b5ee9e8SAntonios Motakis } 196860ce86c7SWei Liu if (S_ISDIR(stbuf.st_mode)) { 196960ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 197060ce86c7SWei Liu if (err < 0) { 197160ce86c7SWei Liu goto out; 197260ce86c7SWei Liu } 197360ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 197460ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, 0); 197560ce86c7SWei Liu if (err < 0) { 197660ce86c7SWei Liu goto out; 197760ce86c7SWei Liu } 197860ce86c7SWei Liu err += offset; 197960ce86c7SWei Liu } else { 198060ce86c7SWei Liu if (s->proto_version == V9FS_PROTO_2000L) { 198160ce86c7SWei Liu flags = get_dotl_openflags(s, mode); 198260ce86c7SWei Liu } else { 198360ce86c7SWei Liu flags = omode_to_uflags(mode); 198460ce86c7SWei Liu } 198560ce86c7SWei Liu if (is_ro_export(&s->ctx)) { 198660ce86c7SWei Liu if (mode & O_WRONLY || mode & O_RDWR || 198760ce86c7SWei Liu mode & O_APPEND || mode & O_TRUNC) { 198860ce86c7SWei Liu err = -EROFS; 198960ce86c7SWei Liu goto out; 199060ce86c7SWei Liu } 199160ce86c7SWei Liu } 199260ce86c7SWei Liu err = v9fs_co_open(pdu, fidp, flags); 199360ce86c7SWei Liu if (err < 0) { 199460ce86c7SWei Liu goto out; 199560ce86c7SWei Liu } 199660ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 199760ce86c7SWei Liu fidp->open_flags = flags; 199860ce86c7SWei Liu if (flags & O_EXCL) { 199960ce86c7SWei Liu /* 200060ce86c7SWei Liu * We let the host file system do O_EXCL check 200160ce86c7SWei Liu * We should not reclaim such fd 200260ce86c7SWei Liu */ 200360ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 200460ce86c7SWei Liu } 200560ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 200660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 200760ce86c7SWei Liu if (err < 0) { 200860ce86c7SWei Liu goto out; 200960ce86c7SWei Liu } 201060ce86c7SWei Liu err += offset; 201160ce86c7SWei Liu } 201260ce86c7SWei Liu trace_v9fs_open_return(pdu->tag, pdu->id, 201360ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 201460ce86c7SWei Liu out: 201560ce86c7SWei Liu put_fid(pdu, fidp); 201660ce86c7SWei Liu out_nofid: 201760ce86c7SWei Liu pdu_complete(pdu, err); 201860ce86c7SWei Liu } 201960ce86c7SWei Liu 20208440e22eSGreg Kurz static void coroutine_fn v9fs_lcreate(void *opaque) 202160ce86c7SWei Liu { 202260ce86c7SWei Liu int32_t dfid, flags, mode; 202360ce86c7SWei Liu gid_t gid; 202460ce86c7SWei Liu ssize_t err = 0; 202560ce86c7SWei Liu ssize_t offset = 7; 202660ce86c7SWei Liu V9fsString name; 202760ce86c7SWei Liu V9fsFidState *fidp; 202860ce86c7SWei Liu struct stat stbuf; 202960ce86c7SWei Liu V9fsQID qid; 203060ce86c7SWei Liu int32_t iounit; 203160ce86c7SWei Liu V9fsPDU *pdu = opaque; 203260ce86c7SWei Liu 203360ce86c7SWei Liu v9fs_string_init(&name); 203460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, 203560ce86c7SWei Liu &name, &flags, &mode, &gid); 203660ce86c7SWei Liu if (err < 0) { 203760ce86c7SWei Liu goto out_nofid; 203860ce86c7SWei Liu } 203960ce86c7SWei Liu trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); 204060ce86c7SWei Liu 2041fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2042fff39a7aSGreg Kurz err = -ENOENT; 2043fff39a7aSGreg Kurz goto out_nofid; 2044fff39a7aSGreg Kurz } 2045fff39a7aSGreg Kurz 2046805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2047805b5d98SGreg Kurz err = -EEXIST; 2048805b5d98SGreg Kurz goto out_nofid; 2049805b5d98SGreg Kurz } 2050805b5d98SGreg Kurz 205160ce86c7SWei Liu fidp = get_fid(pdu, dfid); 205260ce86c7SWei Liu if (fidp == NULL) { 205360ce86c7SWei Liu err = -ENOENT; 205460ce86c7SWei Liu goto out_nofid; 205560ce86c7SWei Liu } 2056d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2057d63fb193SLi Qiang err = -EINVAL; 2058d63fb193SLi Qiang goto out; 2059d63fb193SLi Qiang } 206060ce86c7SWei Liu 206160ce86c7SWei Liu flags = get_dotl_openflags(pdu->s, flags); 206260ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, gid, 206360ce86c7SWei Liu flags | O_CREAT, mode, &stbuf); 206460ce86c7SWei Liu if (err < 0) { 206560ce86c7SWei Liu goto out; 206660ce86c7SWei Liu } 206760ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 206860ce86c7SWei Liu fidp->open_flags = flags; 206960ce86c7SWei Liu if (flags & O_EXCL) { 207060ce86c7SWei Liu /* 207160ce86c7SWei Liu * We let the host file system do O_EXCL check 207260ce86c7SWei Liu * We should not reclaim such fd 207360ce86c7SWei Liu */ 207460ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 207560ce86c7SWei Liu } 207660ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 20773b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 20783b5ee9e8SAntonios Motakis if (err < 0) { 20793b5ee9e8SAntonios Motakis goto out; 20803b5ee9e8SAntonios Motakis } 208160ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 208260ce86c7SWei Liu if (err < 0) { 208360ce86c7SWei Liu goto out; 208460ce86c7SWei Liu } 208560ce86c7SWei Liu err += offset; 208660ce86c7SWei Liu trace_v9fs_lcreate_return(pdu->tag, pdu->id, 208760ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 208860ce86c7SWei Liu out: 208960ce86c7SWei Liu put_fid(pdu, fidp); 209060ce86c7SWei Liu out_nofid: 209160ce86c7SWei Liu pdu_complete(pdu, err); 209260ce86c7SWei Liu v9fs_string_free(&name); 209360ce86c7SWei Liu } 209460ce86c7SWei Liu 2095a1bf8b74SGreg Kurz static void coroutine_fn v9fs_fsync(void *opaque) 209660ce86c7SWei Liu { 209760ce86c7SWei Liu int err; 209860ce86c7SWei Liu int32_t fid; 209960ce86c7SWei Liu int datasync; 210060ce86c7SWei Liu size_t offset = 7; 210160ce86c7SWei Liu V9fsFidState *fidp; 210260ce86c7SWei Liu V9fsPDU *pdu = opaque; 210360ce86c7SWei Liu 210460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); 210560ce86c7SWei Liu if (err < 0) { 210660ce86c7SWei Liu goto out_nofid; 210760ce86c7SWei Liu } 210860ce86c7SWei Liu trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); 210960ce86c7SWei Liu 211060ce86c7SWei Liu fidp = get_fid(pdu, fid); 211160ce86c7SWei Liu if (fidp == NULL) { 211260ce86c7SWei Liu err = -ENOENT; 211360ce86c7SWei Liu goto out_nofid; 211460ce86c7SWei Liu } 211560ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, datasync); 211660ce86c7SWei Liu if (!err) { 211760ce86c7SWei Liu err = offset; 211860ce86c7SWei Liu } 211960ce86c7SWei Liu put_fid(pdu, fidp); 212060ce86c7SWei Liu out_nofid: 212160ce86c7SWei Liu pdu_complete(pdu, err); 212260ce86c7SWei Liu } 212360ce86c7SWei Liu 21248440e22eSGreg Kurz static void coroutine_fn v9fs_clunk(void *opaque) 212560ce86c7SWei Liu { 212660ce86c7SWei Liu int err; 212760ce86c7SWei Liu int32_t fid; 212860ce86c7SWei Liu size_t offset = 7; 212960ce86c7SWei Liu V9fsFidState *fidp; 213060ce86c7SWei Liu V9fsPDU *pdu = opaque; 213160ce86c7SWei Liu V9fsState *s = pdu->s; 213260ce86c7SWei Liu 213360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 213460ce86c7SWei Liu if (err < 0) { 213560ce86c7SWei Liu goto out_nofid; 213660ce86c7SWei Liu } 213760ce86c7SWei Liu trace_v9fs_clunk(pdu->tag, pdu->id, fid); 213860ce86c7SWei Liu 213960ce86c7SWei Liu fidp = clunk_fid(s, fid); 214060ce86c7SWei Liu if (fidp == NULL) { 214160ce86c7SWei Liu err = -ENOENT; 214260ce86c7SWei Liu goto out_nofid; 214360ce86c7SWei Liu } 214460ce86c7SWei Liu /* 214560ce86c7SWei Liu * Bump the ref so that put_fid will 214660ce86c7SWei Liu * free the fid. 214760ce86c7SWei Liu */ 214860ce86c7SWei Liu fidp->ref++; 214960ce86c7SWei Liu err = put_fid(pdu, fidp); 215060ce86c7SWei Liu if (!err) { 215160ce86c7SWei Liu err = offset; 215260ce86c7SWei Liu } 215360ce86c7SWei Liu out_nofid: 215460ce86c7SWei Liu pdu_complete(pdu, err); 215560ce86c7SWei Liu } 215660ce86c7SWei Liu 2157bcb8998fSStefano Stabellini /* 2158bcb8998fSStefano Stabellini * Create a QEMUIOVector for a sub-region of PDU iovecs 2159bcb8998fSStefano Stabellini * 2160bcb8998fSStefano Stabellini * @qiov: uninitialized QEMUIOVector 2161bcb8998fSStefano Stabellini * @skip: number of bytes to skip from beginning of PDU 2162bcb8998fSStefano Stabellini * @size: number of bytes to include 2163bcb8998fSStefano Stabellini * @is_write: true - write, false - read 2164bcb8998fSStefano Stabellini * 2165bcb8998fSStefano Stabellini * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up 2166bcb8998fSStefano Stabellini * with qemu_iovec_destroy(). 2167bcb8998fSStefano Stabellini */ 2168bcb8998fSStefano Stabellini static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, 2169cf45183bSStefano Stabellini size_t skip, size_t size, 2170bcb8998fSStefano Stabellini bool is_write) 2171bcb8998fSStefano Stabellini { 2172bcb8998fSStefano Stabellini QEMUIOVector elem; 2173bcb8998fSStefano Stabellini struct iovec *iov; 2174bcb8998fSStefano Stabellini unsigned int niov; 2175bcb8998fSStefano Stabellini 217688da0b03SStefano Stabellini if (is_write) { 2177cf45183bSStefano Stabellini pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); 217888da0b03SStefano Stabellini } else { 2179cf45183bSStefano Stabellini pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); 218088da0b03SStefano Stabellini } 2181bcb8998fSStefano Stabellini 2182bcb8998fSStefano Stabellini qemu_iovec_init_external(&elem, iov, niov); 2183bcb8998fSStefano Stabellini qemu_iovec_init(qiov, niov); 2184cf45183bSStefano Stabellini qemu_iovec_concat(qiov, &elem, skip, size); 2185bcb8998fSStefano Stabellini } 2186bcb8998fSStefano Stabellini 218760ce86c7SWei Liu static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 218860ce86c7SWei Liu uint64_t off, uint32_t max_count) 218960ce86c7SWei Liu { 219060ce86c7SWei Liu ssize_t err; 219160ce86c7SWei Liu size_t offset = 7; 2192cf45183bSStefano Stabellini uint64_t read_count; 2193bcb8998fSStefano Stabellini QEMUIOVector qiov_full; 219460ce86c7SWei Liu 21957e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 21967e55d65cSLi Qiang read_count = 0; 219716724a17SGreg Kurz } else { 2198cf45183bSStefano Stabellini read_count = fidp->fs.xattr.len - off; 2199cf45183bSStefano Stabellini } 2200cf45183bSStefano Stabellini if (read_count > max_count) { 220160ce86c7SWei Liu read_count = max_count; 220260ce86c7SWei Liu } 220360ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", read_count); 220460ce86c7SWei Liu if (err < 0) { 220560ce86c7SWei Liu return err; 220660ce86c7SWei Liu } 220760ce86c7SWei Liu offset += err; 220800588a0aSWei Liu 2209cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); 2210fa0eb5c5SGreg Kurz err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, 221160ce86c7SWei Liu ((char *)fidp->fs.xattr.value) + off, 221260ce86c7SWei Liu read_count); 2213bcb8998fSStefano Stabellini qemu_iovec_destroy(&qiov_full); 221460ce86c7SWei Liu if (err < 0) { 221560ce86c7SWei Liu return err; 221660ce86c7SWei Liu } 221760ce86c7SWei Liu offset += err; 221860ce86c7SWei Liu return offset; 221960ce86c7SWei Liu } 222060ce86c7SWei Liu 22218440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, 22228440e22eSGreg Kurz V9fsFidState *fidp, 22238440e22eSGreg Kurz uint32_t max_count) 222460ce86c7SWei Liu { 222560ce86c7SWei Liu V9fsPath path; 222660ce86c7SWei Liu V9fsStat v9stat; 222760ce86c7SWei Liu int len, err = 0; 222860ce86c7SWei Liu int32_t count = 0; 222960ce86c7SWei Liu struct stat stbuf; 223060ce86c7SWei Liu off_t saved_dir_pos; 2231635324e8SGreg Kurz struct dirent *dent; 223260ce86c7SWei Liu 223360ce86c7SWei Liu /* save the directory position */ 223460ce86c7SWei Liu saved_dir_pos = v9fs_co_telldir(pdu, fidp); 223560ce86c7SWei Liu if (saved_dir_pos < 0) { 223660ce86c7SWei Liu return saved_dir_pos; 223760ce86c7SWei Liu } 223860ce86c7SWei Liu 223960ce86c7SWei Liu while (1) { 224060ce86c7SWei Liu v9fs_path_init(&path); 22417cde47d4SGreg Kurz 22427cde47d4SGreg Kurz v9fs_readdir_lock(&fidp->fs.dir); 22437cde47d4SGreg Kurz 2244635324e8SGreg Kurz err = v9fs_co_readdir(pdu, fidp, &dent); 2245635324e8SGreg Kurz if (err || !dent) { 224660ce86c7SWei Liu break; 224760ce86c7SWei Liu } 224860ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); 224960ce86c7SWei Liu if (err < 0) { 22508762a46dSGreg Kurz break; 225160ce86c7SWei Liu } 225260ce86c7SWei Liu err = v9fs_co_lstat(pdu, &path, &stbuf); 225360ce86c7SWei Liu if (err < 0) { 22548762a46dSGreg Kurz break; 225560ce86c7SWei Liu } 22566069537fSJan Dakinevich err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); 225760ce86c7SWei Liu if (err < 0) { 22588762a46dSGreg Kurz break; 225960ce86c7SWei Liu } 2260772a7369SJan Dakinevich if ((count + v9stat.size + 2) > max_count) { 22617cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22627cde47d4SGreg Kurz 226360ce86c7SWei Liu /* Ran out of buffer. Set dir back to old position and return */ 226460ce86c7SWei Liu v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 226560ce86c7SWei Liu v9fs_stat_free(&v9stat); 226660ce86c7SWei Liu v9fs_path_free(&path); 226760ce86c7SWei Liu return count; 226860ce86c7SWei Liu } 2269772a7369SJan Dakinevich 2270772a7369SJan Dakinevich /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 2271772a7369SJan Dakinevich len = pdu_marshal(pdu, 11 + count, "S", &v9stat); 2272772a7369SJan Dakinevich 2273772a7369SJan Dakinevich v9fs_readdir_unlock(&fidp->fs.dir); 2274772a7369SJan Dakinevich 2275772a7369SJan Dakinevich if (len < 0) { 2276772a7369SJan Dakinevich v9fs_co_seekdir(pdu, fidp, saved_dir_pos); 2277772a7369SJan Dakinevich v9fs_stat_free(&v9stat); 2278772a7369SJan Dakinevich v9fs_path_free(&path); 2279772a7369SJan Dakinevich return len; 2280772a7369SJan Dakinevich } 228160ce86c7SWei Liu count += len; 228260ce86c7SWei Liu v9fs_stat_free(&v9stat); 228360ce86c7SWei Liu v9fs_path_free(&path); 228460ce86c7SWei Liu saved_dir_pos = dent->d_off; 228560ce86c7SWei Liu } 22868762a46dSGreg Kurz 22877cde47d4SGreg Kurz v9fs_readdir_unlock(&fidp->fs.dir); 22887cde47d4SGreg Kurz 228960ce86c7SWei Liu v9fs_path_free(&path); 229060ce86c7SWei Liu if (err < 0) { 229160ce86c7SWei Liu return err; 229260ce86c7SWei Liu } 229360ce86c7SWei Liu return count; 229460ce86c7SWei Liu } 229560ce86c7SWei Liu 22968440e22eSGreg Kurz static void coroutine_fn v9fs_read(void *opaque) 229760ce86c7SWei Liu { 229860ce86c7SWei Liu int32_t fid; 229960ce86c7SWei Liu uint64_t off; 230060ce86c7SWei Liu ssize_t err = 0; 230160ce86c7SWei Liu int32_t count = 0; 230260ce86c7SWei Liu size_t offset = 7; 230360ce86c7SWei Liu uint32_t max_count; 230460ce86c7SWei Liu V9fsFidState *fidp; 230560ce86c7SWei Liu V9fsPDU *pdu = opaque; 230660ce86c7SWei Liu V9fsState *s = pdu->s; 230760ce86c7SWei Liu 230860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); 230960ce86c7SWei Liu if (err < 0) { 231060ce86c7SWei Liu goto out_nofid; 231160ce86c7SWei Liu } 231260ce86c7SWei Liu trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); 231360ce86c7SWei Liu 231460ce86c7SWei Liu fidp = get_fid(pdu, fid); 231560ce86c7SWei Liu if (fidp == NULL) { 231660ce86c7SWei Liu err = -EINVAL; 231760ce86c7SWei Liu goto out_nofid; 231860ce86c7SWei Liu } 231960ce86c7SWei Liu if (fidp->fid_type == P9_FID_DIR) { 2320d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000U) { 2321d2c5cf7cSChristian Schoenebeck warn_report_once( 2322d2c5cf7cSChristian Schoenebeck "9p: bad client: T_read request on directory only expected " 2323d2c5cf7cSChristian Schoenebeck "with 9P2000.u protocol version" 2324d2c5cf7cSChristian Schoenebeck ); 2325d2c5cf7cSChristian Schoenebeck err = -EOPNOTSUPP; 2326d2c5cf7cSChristian Schoenebeck goto out; 2327d2c5cf7cSChristian Schoenebeck } 232860ce86c7SWei Liu if (off == 0) { 232960ce86c7SWei Liu v9fs_co_rewinddir(pdu, fidp); 233060ce86c7SWei Liu } 233160ce86c7SWei Liu count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); 233260ce86c7SWei Liu if (count < 0) { 233360ce86c7SWei Liu err = count; 233460ce86c7SWei Liu goto out; 233560ce86c7SWei Liu } 233660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 233760ce86c7SWei Liu if (err < 0) { 233860ce86c7SWei Liu goto out; 233960ce86c7SWei Liu } 234060ce86c7SWei Liu err += offset + count; 234160ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_FILE) { 234260ce86c7SWei Liu QEMUIOVector qiov_full; 234360ce86c7SWei Liu QEMUIOVector qiov; 234460ce86c7SWei Liu int32_t len; 234560ce86c7SWei Liu 2346cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); 234760ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 234860ce86c7SWei Liu do { 234960ce86c7SWei Liu qemu_iovec_reset(&qiov); 235060ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); 235160ce86c7SWei Liu if (0) { 235260ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 235360ce86c7SWei Liu } 235460ce86c7SWei Liu /* Loop in case of EINTR */ 235560ce86c7SWei Liu do { 235660ce86c7SWei Liu len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); 235760ce86c7SWei Liu if (len >= 0) { 235860ce86c7SWei Liu off += len; 235960ce86c7SWei Liu count += len; 236060ce86c7SWei Liu } 236160ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 236260ce86c7SWei Liu if (len < 0) { 236360ce86c7SWei Liu /* IO error return the error */ 236460ce86c7SWei Liu err = len; 2365e95c9a49SLi Qiang goto out_free_iovec; 236660ce86c7SWei Liu } 236760ce86c7SWei Liu } while (count < max_count && len > 0); 236860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", count); 236960ce86c7SWei Liu if (err < 0) { 2370e95c9a49SLi Qiang goto out_free_iovec; 237160ce86c7SWei Liu } 237260ce86c7SWei Liu err += offset + count; 2373e95c9a49SLi Qiang out_free_iovec: 237460ce86c7SWei Liu qemu_iovec_destroy(&qiov); 237560ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 237660ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 237760ce86c7SWei Liu err = v9fs_xattr_read(s, pdu, fidp, off, max_count); 237860ce86c7SWei Liu } else { 237960ce86c7SWei Liu err = -EINVAL; 238060ce86c7SWei Liu } 238160ce86c7SWei Liu trace_v9fs_read_return(pdu->tag, pdu->id, count, err); 238260ce86c7SWei Liu out: 238360ce86c7SWei Liu put_fid(pdu, fidp); 238460ce86c7SWei Liu out_nofid: 238560ce86c7SWei Liu pdu_complete(pdu, err); 238660ce86c7SWei Liu } 238760ce86c7SWei Liu 238829c9d2caSChristian Schoenebeck /** 238929c9d2caSChristian Schoenebeck * Returns size required in Rreaddir response for the passed dirent @p name. 239029c9d2caSChristian Schoenebeck * 239129c9d2caSChristian Schoenebeck * @param name - directory entry's name (i.e. file name, directory name) 239229c9d2caSChristian Schoenebeck * @returns required size in bytes 239329c9d2caSChristian Schoenebeck */ 239429c9d2caSChristian Schoenebeck size_t v9fs_readdir_response_size(V9fsString *name) 239560ce86c7SWei Liu { 239660ce86c7SWei Liu /* 239760ce86c7SWei Liu * Size of each dirent on the wire: size of qid (13) + size of offset (8) 239860ce86c7SWei Liu * size of type (1) + size of name.size (2) + strlen(name.data) 239960ce86c7SWei Liu */ 240060ce86c7SWei Liu return 24 + v9fs_string_size(name); 240160ce86c7SWei Liu } 240260ce86c7SWei Liu 24030c4356baSChristian Schoenebeck static void v9fs_free_dirents(struct V9fsDirEnt *e) 24040c4356baSChristian Schoenebeck { 24050c4356baSChristian Schoenebeck struct V9fsDirEnt *next = NULL; 24060c4356baSChristian Schoenebeck 24070c4356baSChristian Schoenebeck for (; e; e = next) { 24080c4356baSChristian Schoenebeck next = e->next; 24090c4356baSChristian Schoenebeck g_free(e->dent); 24100c4356baSChristian Schoenebeck g_free(e->st); 24110c4356baSChristian Schoenebeck g_free(e); 24120c4356baSChristian Schoenebeck } 24130c4356baSChristian Schoenebeck } 24140c4356baSChristian Schoenebeck 24158440e22eSGreg Kurz static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, 24160c4356baSChristian Schoenebeck off_t offset, int32_t max_count) 241760ce86c7SWei Liu { 241860ce86c7SWei Liu size_t size; 241960ce86c7SWei Liu V9fsQID qid; 242060ce86c7SWei Liu V9fsString name; 242160ce86c7SWei Liu int len, err = 0; 242260ce86c7SWei Liu int32_t count = 0; 2423635324e8SGreg Kurz struct dirent *dent; 24240c4356baSChristian Schoenebeck struct stat *st; 24250c4356baSChristian Schoenebeck struct V9fsDirEnt *entries = NULL; 242660ce86c7SWei Liu 24270c4356baSChristian Schoenebeck /* 24280c4356baSChristian Schoenebeck * inode remapping requires the device id, which in turn might be 24290c4356baSChristian Schoenebeck * different for different directory entries, so if inode remapping is 24300c4356baSChristian Schoenebeck * enabled we have to make a full stat for each directory entry 24310c4356baSChristian Schoenebeck */ 24320c4356baSChristian Schoenebeck const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; 24330c4356baSChristian Schoenebeck 24340c4356baSChristian Schoenebeck /* 24350c4356baSChristian Schoenebeck * Fetch all required directory entries altogether on a background IO 24360c4356baSChristian Schoenebeck * thread from fs driver. We don't want to do that for each entry 24370c4356baSChristian Schoenebeck * individually, because hopping between threads (this main IO thread 24380c4356baSChristian Schoenebeck * and background IO driver thread) would sum up to huge latencies. 24390c4356baSChristian Schoenebeck */ 24400c4356baSChristian Schoenebeck count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, 24410c4356baSChristian Schoenebeck dostat); 24420c4356baSChristian Schoenebeck if (count < 0) { 24430c4356baSChristian Schoenebeck err = count; 24440c4356baSChristian Schoenebeck count = 0; 24450c4356baSChristian Schoenebeck goto out; 244660ce86c7SWei Liu } 24470c4356baSChristian Schoenebeck count = 0; 244860ce86c7SWei Liu 24490c4356baSChristian Schoenebeck for (struct V9fsDirEnt *e = entries; e; e = e->next) { 24500c4356baSChristian Schoenebeck dent = e->dent; 24511a6ed33cSAntonios Motakis 24521a6ed33cSAntonios Motakis if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { 24530c4356baSChristian Schoenebeck st = e->st; 24540c4356baSChristian Schoenebeck /* e->st should never be NULL, but just to be sure */ 24550c4356baSChristian Schoenebeck if (!st) { 24560c4356baSChristian Schoenebeck err = -1; 24570c4356baSChristian Schoenebeck break; 24580c4356baSChristian Schoenebeck } 24590c4356baSChristian Schoenebeck 24600c4356baSChristian Schoenebeck /* remap inode */ 24610c4356baSChristian Schoenebeck err = stat_to_qid(pdu, st, &qid); 24621a6ed33cSAntonios Motakis if (err < 0) { 24630c4356baSChristian Schoenebeck break; 24641a6ed33cSAntonios Motakis } 24651a6ed33cSAntonios Motakis } else { 246660ce86c7SWei Liu /* 246760ce86c7SWei Liu * Fill up just the path field of qid because the client uses 246860ce86c7SWei Liu * only that. To fill the entire qid structure we will have 24691a6ed33cSAntonios Motakis * to stat each dirent found, which is expensive. For the 24700c4356baSChristian Schoenebeck * latter reason we don't call stat_to_qid() here. Only drawback 24711a6ed33cSAntonios Motakis * is that no multi-device export detection of stat_to_qid() 24721a6ed33cSAntonios Motakis * would be done and provided as error to the user here. But 24731a6ed33cSAntonios Motakis * user would get that error anyway when accessing those 24741a6ed33cSAntonios Motakis * files/dirs through other ways. 247560ce86c7SWei Liu */ 247660ce86c7SWei Liu size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); 247760ce86c7SWei Liu memcpy(&qid.path, &dent->d_ino, size); 247860ce86c7SWei Liu /* Fill the other fields with dummy values */ 247960ce86c7SWei Liu qid.type = 0; 248060ce86c7SWei Liu qid.version = 0; 24811a6ed33cSAntonios Motakis } 248260ce86c7SWei Liu 24830c4356baSChristian Schoenebeck v9fs_string_init(&name); 24840c4356baSChristian Schoenebeck v9fs_string_sprintf(&name, "%s", dent->d_name); 24850c4356baSChristian Schoenebeck 248660ce86c7SWei Liu /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ 248760ce86c7SWei Liu len = pdu_marshal(pdu, 11 + count, "Qqbs", 248860ce86c7SWei Liu &qid, dent->d_off, 248960ce86c7SWei Liu dent->d_type, &name); 24907cde47d4SGreg Kurz 24910c4356baSChristian Schoenebeck v9fs_string_free(&name); 24927cde47d4SGreg Kurz 249360ce86c7SWei Liu if (len < 0) { 24940c4356baSChristian Schoenebeck err = len; 24950c4356baSChristian Schoenebeck break; 249660ce86c7SWei Liu } 24970c4356baSChristian Schoenebeck 249860ce86c7SWei Liu count += len; 249960ce86c7SWei Liu } 25007cde47d4SGreg Kurz 25010c4356baSChristian Schoenebeck out: 25020c4356baSChristian Schoenebeck v9fs_free_dirents(entries); 250360ce86c7SWei Liu if (err < 0) { 250460ce86c7SWei Liu return err; 250560ce86c7SWei Liu } 250660ce86c7SWei Liu return count; 250760ce86c7SWei Liu } 250860ce86c7SWei Liu 25098440e22eSGreg Kurz static void coroutine_fn v9fs_readdir(void *opaque) 251060ce86c7SWei Liu { 251160ce86c7SWei Liu int32_t fid; 251260ce86c7SWei Liu V9fsFidState *fidp; 251360ce86c7SWei Liu ssize_t retval = 0; 251460ce86c7SWei Liu size_t offset = 7; 251560ce86c7SWei Liu uint64_t initial_offset; 251660ce86c7SWei Liu int32_t count; 251760ce86c7SWei Liu uint32_t max_count; 251860ce86c7SWei Liu V9fsPDU *pdu = opaque; 2519d36a5c22SChristian Schoenebeck V9fsState *s = pdu->s; 252060ce86c7SWei Liu 252160ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "dqd", &fid, 252260ce86c7SWei Liu &initial_offset, &max_count); 252360ce86c7SWei Liu if (retval < 0) { 252460ce86c7SWei Liu goto out_nofid; 252560ce86c7SWei Liu } 252660ce86c7SWei Liu trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); 252760ce86c7SWei Liu 2528d36a5c22SChristian Schoenebeck /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ 2529d36a5c22SChristian Schoenebeck if (max_count > s->msize - 11) { 2530d36a5c22SChristian Schoenebeck max_count = s->msize - 11; 2531d36a5c22SChristian Schoenebeck warn_report_once( 2532d36a5c22SChristian Schoenebeck "9p: bad client: T_readdir with count > msize - 11" 2533d36a5c22SChristian Schoenebeck ); 2534d36a5c22SChristian Schoenebeck } 2535d36a5c22SChristian Schoenebeck 253660ce86c7SWei Liu fidp = get_fid(pdu, fid); 253760ce86c7SWei Liu if (fidp == NULL) { 253860ce86c7SWei Liu retval = -EINVAL; 253960ce86c7SWei Liu goto out_nofid; 254060ce86c7SWei Liu } 2541f314ea4eSGreg Kurz if (!fidp->fs.dir.stream) { 254260ce86c7SWei Liu retval = -EINVAL; 254360ce86c7SWei Liu goto out; 254460ce86c7SWei Liu } 2545d2c5cf7cSChristian Schoenebeck if (s->proto_version != V9FS_PROTO_2000L) { 2546d2c5cf7cSChristian Schoenebeck warn_report_once( 2547d2c5cf7cSChristian Schoenebeck "9p: bad client: T_readdir request only expected with 9P2000.L " 2548d2c5cf7cSChristian Schoenebeck "protocol version" 2549d2c5cf7cSChristian Schoenebeck ); 2550d2c5cf7cSChristian Schoenebeck retval = -EOPNOTSUPP; 2551d2c5cf7cSChristian Schoenebeck goto out; 2552d2c5cf7cSChristian Schoenebeck } 25530c4356baSChristian Schoenebeck count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); 255460ce86c7SWei Liu if (count < 0) { 255560ce86c7SWei Liu retval = count; 255660ce86c7SWei Liu goto out; 255760ce86c7SWei Liu } 255860ce86c7SWei Liu retval = pdu_marshal(pdu, offset, "d", count); 255960ce86c7SWei Liu if (retval < 0) { 256060ce86c7SWei Liu goto out; 256160ce86c7SWei Liu } 256260ce86c7SWei Liu retval += count + offset; 256360ce86c7SWei Liu trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); 256460ce86c7SWei Liu out: 256560ce86c7SWei Liu put_fid(pdu, fidp); 256660ce86c7SWei Liu out_nofid: 256760ce86c7SWei Liu pdu_complete(pdu, retval); 256860ce86c7SWei Liu } 256960ce86c7SWei Liu 257060ce86c7SWei Liu static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, 257160ce86c7SWei Liu uint64_t off, uint32_t count, 257260ce86c7SWei Liu struct iovec *sg, int cnt) 257360ce86c7SWei Liu { 257460ce86c7SWei Liu int i, to_copy; 257560ce86c7SWei Liu ssize_t err = 0; 25767e55d65cSLi Qiang uint64_t write_count; 257760ce86c7SWei Liu size_t offset = 7; 257860ce86c7SWei Liu 257960ce86c7SWei Liu 25807e55d65cSLi Qiang if (fidp->fs.xattr.len < off) { 2581b858e80aSDaniel Henrique Barboza return -ENOSPC; 258260ce86c7SWei Liu } 25837e55d65cSLi Qiang write_count = fidp->fs.xattr.len - off; 25847e55d65cSLi Qiang if (write_count > count) { 25857e55d65cSLi Qiang write_count = count; 25867e55d65cSLi Qiang } 258760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", write_count); 258860ce86c7SWei Liu if (err < 0) { 258960ce86c7SWei Liu return err; 259060ce86c7SWei Liu } 259160ce86c7SWei Liu err += offset; 259260ce86c7SWei Liu fidp->fs.xattr.copied_len += write_count; 259360ce86c7SWei Liu /* 259460ce86c7SWei Liu * Now copy the content from sg list 259560ce86c7SWei Liu */ 259660ce86c7SWei Liu for (i = 0; i < cnt; i++) { 259760ce86c7SWei Liu if (write_count > sg[i].iov_len) { 259860ce86c7SWei Liu to_copy = sg[i].iov_len; 259960ce86c7SWei Liu } else { 260060ce86c7SWei Liu to_copy = write_count; 260160ce86c7SWei Liu } 260260ce86c7SWei Liu memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); 260360ce86c7SWei Liu /* updating vs->off since we are not using below */ 260460ce86c7SWei Liu off += to_copy; 260560ce86c7SWei Liu write_count -= to_copy; 260660ce86c7SWei Liu } 2607b858e80aSDaniel Henrique Barboza 260860ce86c7SWei Liu return err; 260960ce86c7SWei Liu } 261060ce86c7SWei Liu 26118440e22eSGreg Kurz static void coroutine_fn v9fs_write(void *opaque) 261260ce86c7SWei Liu { 261360ce86c7SWei Liu ssize_t err; 261460ce86c7SWei Liu int32_t fid; 261560ce86c7SWei Liu uint64_t off; 261660ce86c7SWei Liu uint32_t count; 261760ce86c7SWei Liu int32_t len = 0; 261860ce86c7SWei Liu int32_t total = 0; 261960ce86c7SWei Liu size_t offset = 7; 262060ce86c7SWei Liu V9fsFidState *fidp; 262160ce86c7SWei Liu V9fsPDU *pdu = opaque; 262260ce86c7SWei Liu V9fsState *s = pdu->s; 262360ce86c7SWei Liu QEMUIOVector qiov_full; 262460ce86c7SWei Liu QEMUIOVector qiov; 262560ce86c7SWei Liu 262660ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); 262760ce86c7SWei Liu if (err < 0) { 262860ce86c7SWei Liu pdu_complete(pdu, err); 262960ce86c7SWei Liu return; 263060ce86c7SWei Liu } 263160ce86c7SWei Liu offset += err; 2632cf45183bSStefano Stabellini v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); 263360ce86c7SWei Liu trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); 263460ce86c7SWei Liu 263560ce86c7SWei Liu fidp = get_fid(pdu, fid); 263660ce86c7SWei Liu if (fidp == NULL) { 263760ce86c7SWei Liu err = -EINVAL; 263860ce86c7SWei Liu goto out_nofid; 263960ce86c7SWei Liu } 264060ce86c7SWei Liu if (fidp->fid_type == P9_FID_FILE) { 264160ce86c7SWei Liu if (fidp->fs.fd == -1) { 264260ce86c7SWei Liu err = -EINVAL; 264360ce86c7SWei Liu goto out; 264460ce86c7SWei Liu } 264560ce86c7SWei Liu } else if (fidp->fid_type == P9_FID_XATTR) { 264660ce86c7SWei Liu /* 264760ce86c7SWei Liu * setxattr operation 264860ce86c7SWei Liu */ 264960ce86c7SWei Liu err = v9fs_xattr_write(s, pdu, fidp, off, count, 265060ce86c7SWei Liu qiov_full.iov, qiov_full.niov); 265160ce86c7SWei Liu goto out; 265260ce86c7SWei Liu } else { 265360ce86c7SWei Liu err = -EINVAL; 265460ce86c7SWei Liu goto out; 265560ce86c7SWei Liu } 265660ce86c7SWei Liu qemu_iovec_init(&qiov, qiov_full.niov); 265760ce86c7SWei Liu do { 265860ce86c7SWei Liu qemu_iovec_reset(&qiov); 265960ce86c7SWei Liu qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); 266060ce86c7SWei Liu if (0) { 266160ce86c7SWei Liu print_sg(qiov.iov, qiov.niov); 266260ce86c7SWei Liu } 266360ce86c7SWei Liu /* Loop in case of EINTR */ 266460ce86c7SWei Liu do { 266560ce86c7SWei Liu len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); 266660ce86c7SWei Liu if (len >= 0) { 266760ce86c7SWei Liu off += len; 266860ce86c7SWei Liu total += len; 266960ce86c7SWei Liu } 267060ce86c7SWei Liu } while (len == -EINTR && !pdu->cancelled); 267160ce86c7SWei Liu if (len < 0) { 267260ce86c7SWei Liu /* IO error return the error */ 267360ce86c7SWei Liu err = len; 267460ce86c7SWei Liu goto out_qiov; 267560ce86c7SWei Liu } 267660ce86c7SWei Liu } while (total < count && len > 0); 267760ce86c7SWei Liu 267860ce86c7SWei Liu offset = 7; 267960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "d", total); 268060ce86c7SWei Liu if (err < 0) { 2681fdfcc9aeSLi Qiang goto out_qiov; 268260ce86c7SWei Liu } 268360ce86c7SWei Liu err += offset; 268460ce86c7SWei Liu trace_v9fs_write_return(pdu->tag, pdu->id, total, err); 268560ce86c7SWei Liu out_qiov: 268660ce86c7SWei Liu qemu_iovec_destroy(&qiov); 268760ce86c7SWei Liu out: 268860ce86c7SWei Liu put_fid(pdu, fidp); 268960ce86c7SWei Liu out_nofid: 269060ce86c7SWei Liu qemu_iovec_destroy(&qiov_full); 269160ce86c7SWei Liu pdu_complete(pdu, err); 269260ce86c7SWei Liu } 269360ce86c7SWei Liu 26948440e22eSGreg Kurz static void coroutine_fn v9fs_create(void *opaque) 269560ce86c7SWei Liu { 269660ce86c7SWei Liu int32_t fid; 269760ce86c7SWei Liu int err = 0; 269860ce86c7SWei Liu size_t offset = 7; 269960ce86c7SWei Liu V9fsFidState *fidp; 270060ce86c7SWei Liu V9fsQID qid; 270160ce86c7SWei Liu int32_t perm; 270260ce86c7SWei Liu int8_t mode; 270360ce86c7SWei Liu V9fsPath path; 270460ce86c7SWei Liu struct stat stbuf; 270560ce86c7SWei Liu V9fsString name; 270660ce86c7SWei Liu V9fsString extension; 270760ce86c7SWei Liu int iounit; 270860ce86c7SWei Liu V9fsPDU *pdu = opaque; 27095b3c77aaSGreg Kurz V9fsState *s = pdu->s; 271060ce86c7SWei Liu 271160ce86c7SWei Liu v9fs_path_init(&path); 271260ce86c7SWei Liu v9fs_string_init(&name); 271360ce86c7SWei Liu v9fs_string_init(&extension); 271460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, 271560ce86c7SWei Liu &perm, &mode, &extension); 271660ce86c7SWei Liu if (err < 0) { 271760ce86c7SWei Liu goto out_nofid; 271860ce86c7SWei Liu } 271960ce86c7SWei Liu trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); 272060ce86c7SWei Liu 2721fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2722fff39a7aSGreg Kurz err = -ENOENT; 2723fff39a7aSGreg Kurz goto out_nofid; 2724fff39a7aSGreg Kurz } 2725fff39a7aSGreg Kurz 2726805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2727805b5d98SGreg Kurz err = -EEXIST; 2728805b5d98SGreg Kurz goto out_nofid; 2729805b5d98SGreg Kurz } 2730805b5d98SGreg Kurz 273160ce86c7SWei Liu fidp = get_fid(pdu, fid); 273260ce86c7SWei Liu if (fidp == NULL) { 273360ce86c7SWei Liu err = -EINVAL; 273460ce86c7SWei Liu goto out_nofid; 273560ce86c7SWei Liu } 2736d63fb193SLi Qiang if (fidp->fid_type != P9_FID_NONE) { 2737d63fb193SLi Qiang err = -EINVAL; 2738d63fb193SLi Qiang goto out; 2739d63fb193SLi Qiang } 274060ce86c7SWei Liu if (perm & P9_STAT_MODE_DIR) { 274160ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, 274260ce86c7SWei Liu fidp->uid, -1, &stbuf); 274360ce86c7SWei Liu if (err < 0) { 274460ce86c7SWei Liu goto out; 274560ce86c7SWei Liu } 274660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 274760ce86c7SWei Liu if (err < 0) { 274860ce86c7SWei Liu goto out; 274960ce86c7SWei Liu } 27505b3c77aaSGreg Kurz v9fs_path_write_lock(s); 275160ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27525b3c77aaSGreg Kurz v9fs_path_unlock(s); 275360ce86c7SWei Liu err = v9fs_co_opendir(pdu, fidp); 275460ce86c7SWei Liu if (err < 0) { 275560ce86c7SWei Liu goto out; 275660ce86c7SWei Liu } 275760ce86c7SWei Liu fidp->fid_type = P9_FID_DIR; 275860ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SYMLINK) { 275960ce86c7SWei Liu err = v9fs_co_symlink(pdu, fidp, &name, 276060ce86c7SWei Liu extension.data, -1 , &stbuf); 276160ce86c7SWei Liu if (err < 0) { 276260ce86c7SWei Liu goto out; 276360ce86c7SWei Liu } 276460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 276560ce86c7SWei Liu if (err < 0) { 276660ce86c7SWei Liu goto out; 276760ce86c7SWei Liu } 27685b3c77aaSGreg Kurz v9fs_path_write_lock(s); 276960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27705b3c77aaSGreg Kurz v9fs_path_unlock(s); 277160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_LINK) { 277260ce86c7SWei Liu int32_t ofid = atoi(extension.data); 277360ce86c7SWei Liu V9fsFidState *ofidp = get_fid(pdu, ofid); 277460ce86c7SWei Liu if (ofidp == NULL) { 277560ce86c7SWei Liu err = -EINVAL; 277660ce86c7SWei Liu goto out; 277760ce86c7SWei Liu } 277860ce86c7SWei Liu err = v9fs_co_link(pdu, ofidp, fidp, &name); 277960ce86c7SWei Liu put_fid(pdu, ofidp); 278060ce86c7SWei Liu if (err < 0) { 278160ce86c7SWei Liu goto out; 278260ce86c7SWei Liu } 278360ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 278460ce86c7SWei Liu if (err < 0) { 278560ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 278660ce86c7SWei Liu goto out; 278760ce86c7SWei Liu } 27885b3c77aaSGreg Kurz v9fs_path_write_lock(s); 278960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 27905b3c77aaSGreg Kurz v9fs_path_unlock(s); 279160ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 279260ce86c7SWei Liu if (err < 0) { 279360ce86c7SWei Liu fidp->fid_type = P9_FID_NONE; 279460ce86c7SWei Liu goto out; 279560ce86c7SWei Liu } 279660ce86c7SWei Liu } else if (perm & P9_STAT_MODE_DEVICE) { 279760ce86c7SWei Liu char ctype; 279860ce86c7SWei Liu uint32_t major, minor; 279960ce86c7SWei Liu mode_t nmode = 0; 280060ce86c7SWei Liu 280160ce86c7SWei Liu if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { 280260ce86c7SWei Liu err = -errno; 280360ce86c7SWei Liu goto out; 280460ce86c7SWei Liu } 280560ce86c7SWei Liu 280660ce86c7SWei Liu switch (ctype) { 280760ce86c7SWei Liu case 'c': 280860ce86c7SWei Liu nmode = S_IFCHR; 280960ce86c7SWei Liu break; 281060ce86c7SWei Liu case 'b': 281160ce86c7SWei Liu nmode = S_IFBLK; 281260ce86c7SWei Liu break; 281360ce86c7SWei Liu default: 281460ce86c7SWei Liu err = -EIO; 281560ce86c7SWei Liu goto out; 281660ce86c7SWei Liu } 281760ce86c7SWei Liu 281860ce86c7SWei Liu nmode |= perm & 0777; 281960ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 282060ce86c7SWei Liu makedev(major, minor), nmode, &stbuf); 282160ce86c7SWei Liu if (err < 0) { 282260ce86c7SWei Liu goto out; 282360ce86c7SWei Liu } 282460ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 282560ce86c7SWei Liu if (err < 0) { 282660ce86c7SWei Liu goto out; 282760ce86c7SWei Liu } 28285b3c77aaSGreg Kurz v9fs_path_write_lock(s); 282960ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28305b3c77aaSGreg Kurz v9fs_path_unlock(s); 283160ce86c7SWei Liu } else if (perm & P9_STAT_MODE_NAMED_PIPE) { 283260ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 283360ce86c7SWei Liu 0, S_IFIFO | (perm & 0777), &stbuf); 283460ce86c7SWei Liu if (err < 0) { 283560ce86c7SWei Liu goto out; 283660ce86c7SWei Liu } 283760ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 283860ce86c7SWei Liu if (err < 0) { 283960ce86c7SWei Liu goto out; 284060ce86c7SWei Liu } 28415b3c77aaSGreg Kurz v9fs_path_write_lock(s); 284260ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28435b3c77aaSGreg Kurz v9fs_path_unlock(s); 284460ce86c7SWei Liu } else if (perm & P9_STAT_MODE_SOCKET) { 284560ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, 284660ce86c7SWei Liu 0, S_IFSOCK | (perm & 0777), &stbuf); 284760ce86c7SWei Liu if (err < 0) { 284860ce86c7SWei Liu goto out; 284960ce86c7SWei Liu } 285060ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); 285160ce86c7SWei Liu if (err < 0) { 285260ce86c7SWei Liu goto out; 285360ce86c7SWei Liu } 28545b3c77aaSGreg Kurz v9fs_path_write_lock(s); 285560ce86c7SWei Liu v9fs_path_copy(&fidp->path, &path); 28565b3c77aaSGreg Kurz v9fs_path_unlock(s); 285760ce86c7SWei Liu } else { 285860ce86c7SWei Liu err = v9fs_co_open2(pdu, fidp, &name, -1, 285960ce86c7SWei Liu omode_to_uflags(mode) | O_CREAT, perm, &stbuf); 286060ce86c7SWei Liu if (err < 0) { 286160ce86c7SWei Liu goto out; 286260ce86c7SWei Liu } 286360ce86c7SWei Liu fidp->fid_type = P9_FID_FILE; 286460ce86c7SWei Liu fidp->open_flags = omode_to_uflags(mode); 286560ce86c7SWei Liu if (fidp->open_flags & O_EXCL) { 286660ce86c7SWei Liu /* 286760ce86c7SWei Liu * We let the host file system do O_EXCL check 286860ce86c7SWei Liu * We should not reclaim such fd 286960ce86c7SWei Liu */ 287060ce86c7SWei Liu fidp->flags |= FID_NON_RECLAIMABLE; 287160ce86c7SWei Liu } 287260ce86c7SWei Liu } 287360ce86c7SWei Liu iounit = get_iounit(pdu, &fidp->path); 28743b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 28753b5ee9e8SAntonios Motakis if (err < 0) { 28763b5ee9e8SAntonios Motakis goto out; 28773b5ee9e8SAntonios Motakis } 287860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); 287960ce86c7SWei Liu if (err < 0) { 288060ce86c7SWei Liu goto out; 288160ce86c7SWei Liu } 288260ce86c7SWei Liu err += offset; 288360ce86c7SWei Liu trace_v9fs_create_return(pdu->tag, pdu->id, 288460ce86c7SWei Liu qid.type, qid.version, qid.path, iounit); 288560ce86c7SWei Liu out: 288660ce86c7SWei Liu put_fid(pdu, fidp); 288760ce86c7SWei Liu out_nofid: 288860ce86c7SWei Liu pdu_complete(pdu, err); 288960ce86c7SWei Liu v9fs_string_free(&name); 289060ce86c7SWei Liu v9fs_string_free(&extension); 289160ce86c7SWei Liu v9fs_path_free(&path); 289260ce86c7SWei Liu } 289360ce86c7SWei Liu 28948440e22eSGreg Kurz static void coroutine_fn v9fs_symlink(void *opaque) 289560ce86c7SWei Liu { 289660ce86c7SWei Liu V9fsPDU *pdu = opaque; 289760ce86c7SWei Liu V9fsString name; 289860ce86c7SWei Liu V9fsString symname; 289960ce86c7SWei Liu V9fsFidState *dfidp; 290060ce86c7SWei Liu V9fsQID qid; 290160ce86c7SWei Liu struct stat stbuf; 290260ce86c7SWei Liu int32_t dfid; 290360ce86c7SWei Liu int err = 0; 290460ce86c7SWei Liu gid_t gid; 290560ce86c7SWei Liu size_t offset = 7; 290660ce86c7SWei Liu 290760ce86c7SWei Liu v9fs_string_init(&name); 290860ce86c7SWei Liu v9fs_string_init(&symname); 290960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); 291060ce86c7SWei Liu if (err < 0) { 291160ce86c7SWei Liu goto out_nofid; 291260ce86c7SWei Liu } 291360ce86c7SWei Liu trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); 291460ce86c7SWei Liu 2915fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 2916fff39a7aSGreg Kurz err = -ENOENT; 2917fff39a7aSGreg Kurz goto out_nofid; 2918fff39a7aSGreg Kurz } 2919fff39a7aSGreg Kurz 2920805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 2921805b5d98SGreg Kurz err = -EEXIST; 2922805b5d98SGreg Kurz goto out_nofid; 2923805b5d98SGreg Kurz } 2924805b5d98SGreg Kurz 292560ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 292660ce86c7SWei Liu if (dfidp == NULL) { 292760ce86c7SWei Liu err = -EINVAL; 292860ce86c7SWei Liu goto out_nofid; 292960ce86c7SWei Liu } 293060ce86c7SWei Liu err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); 293160ce86c7SWei Liu if (err < 0) { 293260ce86c7SWei Liu goto out; 293360ce86c7SWei Liu } 29343b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 29353b5ee9e8SAntonios Motakis if (err < 0) { 29363b5ee9e8SAntonios Motakis goto out; 29373b5ee9e8SAntonios Motakis } 293860ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 293960ce86c7SWei Liu if (err < 0) { 294060ce86c7SWei Liu goto out; 294160ce86c7SWei Liu } 294260ce86c7SWei Liu err += offset; 294360ce86c7SWei Liu trace_v9fs_symlink_return(pdu->tag, pdu->id, 294460ce86c7SWei Liu qid.type, qid.version, qid.path); 294560ce86c7SWei Liu out: 294660ce86c7SWei Liu put_fid(pdu, dfidp); 294760ce86c7SWei Liu out_nofid: 294860ce86c7SWei Liu pdu_complete(pdu, err); 294960ce86c7SWei Liu v9fs_string_free(&name); 295060ce86c7SWei Liu v9fs_string_free(&symname); 295160ce86c7SWei Liu } 295260ce86c7SWei Liu 2953a1bf8b74SGreg Kurz static void coroutine_fn v9fs_flush(void *opaque) 295460ce86c7SWei Liu { 295560ce86c7SWei Liu ssize_t err; 295660ce86c7SWei Liu int16_t tag; 295760ce86c7SWei Liu size_t offset = 7; 2958d5f2af7bSGreg Kurz V9fsPDU *cancel_pdu = NULL; 295960ce86c7SWei Liu V9fsPDU *pdu = opaque; 296060ce86c7SWei Liu V9fsState *s = pdu->s; 296160ce86c7SWei Liu 296260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "w", &tag); 296360ce86c7SWei Liu if (err < 0) { 296460ce86c7SWei Liu pdu_complete(pdu, err); 296560ce86c7SWei Liu return; 296660ce86c7SWei Liu } 296760ce86c7SWei Liu trace_v9fs_flush(pdu->tag, pdu->id, tag); 296860ce86c7SWei Liu 2969d5f2af7bSGreg Kurz if (pdu->tag == tag) { 29703dc6f869SAlistair Francis warn_report("the guest sent a self-referencing 9P flush request"); 2971d5f2af7bSGreg Kurz } else { 297260ce86c7SWei Liu QLIST_FOREACH(cancel_pdu, &s->active_list, next) { 297360ce86c7SWei Liu if (cancel_pdu->tag == tag) { 297460ce86c7SWei Liu break; 297560ce86c7SWei Liu } 297660ce86c7SWei Liu } 2977d5f2af7bSGreg Kurz } 297860ce86c7SWei Liu if (cancel_pdu) { 297960ce86c7SWei Liu cancel_pdu->cancelled = 1; 298060ce86c7SWei Liu /* 298160ce86c7SWei Liu * Wait for pdu to complete. 298260ce86c7SWei Liu */ 29831ace7ceaSPaolo Bonzini qemu_co_queue_wait(&cancel_pdu->complete, NULL); 298418adde86SGreg Kurz if (!qemu_co_queue_next(&cancel_pdu->complete)) { 298560ce86c7SWei Liu cancel_pdu->cancelled = 0; 298660ce86c7SWei Liu pdu_free(cancel_pdu); 298760ce86c7SWei Liu } 298818adde86SGreg Kurz } 298960ce86c7SWei Liu pdu_complete(pdu, 7); 299060ce86c7SWei Liu } 299160ce86c7SWei Liu 29928440e22eSGreg Kurz static void coroutine_fn v9fs_link(void *opaque) 299360ce86c7SWei Liu { 299460ce86c7SWei Liu V9fsPDU *pdu = opaque; 299560ce86c7SWei Liu int32_t dfid, oldfid; 299660ce86c7SWei Liu V9fsFidState *dfidp, *oldfidp; 299760ce86c7SWei Liu V9fsString name; 299860ce86c7SWei Liu size_t offset = 7; 299960ce86c7SWei Liu int err = 0; 300060ce86c7SWei Liu 300160ce86c7SWei Liu v9fs_string_init(&name); 300260ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); 300360ce86c7SWei Liu if (err < 0) { 300460ce86c7SWei Liu goto out_nofid; 300560ce86c7SWei Liu } 300660ce86c7SWei Liu trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); 300760ce86c7SWei Liu 3008fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3009fff39a7aSGreg Kurz err = -ENOENT; 3010fff39a7aSGreg Kurz goto out_nofid; 3011fff39a7aSGreg Kurz } 3012fff39a7aSGreg Kurz 3013805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3014805b5d98SGreg Kurz err = -EEXIST; 3015805b5d98SGreg Kurz goto out_nofid; 3016805b5d98SGreg Kurz } 3017805b5d98SGreg Kurz 301860ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 301960ce86c7SWei Liu if (dfidp == NULL) { 302060ce86c7SWei Liu err = -ENOENT; 302160ce86c7SWei Liu goto out_nofid; 302260ce86c7SWei Liu } 302360ce86c7SWei Liu 302460ce86c7SWei Liu oldfidp = get_fid(pdu, oldfid); 302560ce86c7SWei Liu if (oldfidp == NULL) { 302660ce86c7SWei Liu err = -ENOENT; 302760ce86c7SWei Liu goto out; 302860ce86c7SWei Liu } 302960ce86c7SWei Liu err = v9fs_co_link(pdu, oldfidp, dfidp, &name); 303060ce86c7SWei Liu if (!err) { 303160ce86c7SWei Liu err = offset; 303260ce86c7SWei Liu } 30334c158678SLi Qiang put_fid(pdu, oldfidp); 303460ce86c7SWei Liu out: 303560ce86c7SWei Liu put_fid(pdu, dfidp); 303660ce86c7SWei Liu out_nofid: 303760ce86c7SWei Liu v9fs_string_free(&name); 303860ce86c7SWei Liu pdu_complete(pdu, err); 303960ce86c7SWei Liu } 304060ce86c7SWei Liu 304160ce86c7SWei Liu /* Only works with path name based fid */ 30428440e22eSGreg Kurz static void coroutine_fn v9fs_remove(void *opaque) 304360ce86c7SWei Liu { 304460ce86c7SWei Liu int32_t fid; 304560ce86c7SWei Liu int err = 0; 304660ce86c7SWei Liu size_t offset = 7; 304760ce86c7SWei Liu V9fsFidState *fidp; 304860ce86c7SWei Liu V9fsPDU *pdu = opaque; 304960ce86c7SWei Liu 305060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 305160ce86c7SWei Liu if (err < 0) { 305260ce86c7SWei Liu goto out_nofid; 305360ce86c7SWei Liu } 305460ce86c7SWei Liu trace_v9fs_remove(pdu->tag, pdu->id, fid); 305560ce86c7SWei Liu 305660ce86c7SWei Liu fidp = get_fid(pdu, fid); 305760ce86c7SWei Liu if (fidp == NULL) { 305860ce86c7SWei Liu err = -EINVAL; 305960ce86c7SWei Liu goto out_nofid; 306060ce86c7SWei Liu } 306160ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 306260ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 306360ce86c7SWei Liu err = -EOPNOTSUPP; 306460ce86c7SWei Liu goto out_err; 306560ce86c7SWei Liu } 306660ce86c7SWei Liu /* 306760ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 306860ce86c7SWei Liu * the file later. So don't reclaim fd 306960ce86c7SWei Liu */ 307060ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); 307160ce86c7SWei Liu if (err < 0) { 307260ce86c7SWei Liu goto out_err; 307360ce86c7SWei Liu } 307460ce86c7SWei Liu err = v9fs_co_remove(pdu, &fidp->path); 307560ce86c7SWei Liu if (!err) { 307660ce86c7SWei Liu err = offset; 307760ce86c7SWei Liu } 307860ce86c7SWei Liu out_err: 307960ce86c7SWei Liu /* For TREMOVE we need to clunk the fid even on failed remove */ 308060ce86c7SWei Liu clunk_fid(pdu->s, fidp->fid); 308160ce86c7SWei Liu put_fid(pdu, fidp); 308260ce86c7SWei Liu out_nofid: 308360ce86c7SWei Liu pdu_complete(pdu, err); 308460ce86c7SWei Liu } 308560ce86c7SWei Liu 30868440e22eSGreg Kurz static void coroutine_fn v9fs_unlinkat(void *opaque) 308760ce86c7SWei Liu { 308860ce86c7SWei Liu int err = 0; 308960ce86c7SWei Liu V9fsString name; 309067e87345SKeno Fischer int32_t dfid, flags, rflags = 0; 309160ce86c7SWei Liu size_t offset = 7; 309260ce86c7SWei Liu V9fsPath path; 309360ce86c7SWei Liu V9fsFidState *dfidp; 309460ce86c7SWei Liu V9fsPDU *pdu = opaque; 309560ce86c7SWei Liu 309660ce86c7SWei Liu v9fs_string_init(&name); 309760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); 309860ce86c7SWei Liu if (err < 0) { 309960ce86c7SWei Liu goto out_nofid; 310060ce86c7SWei Liu } 3101fff39a7aSGreg Kurz 3102fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3103fff39a7aSGreg Kurz err = -ENOENT; 3104fff39a7aSGreg Kurz goto out_nofid; 3105fff39a7aSGreg Kurz } 3106fff39a7aSGreg Kurz 3107805b5d98SGreg Kurz if (!strcmp(".", name.data)) { 3108805b5d98SGreg Kurz err = -EINVAL; 3109805b5d98SGreg Kurz goto out_nofid; 3110805b5d98SGreg Kurz } 3111805b5d98SGreg Kurz 3112805b5d98SGreg Kurz if (!strcmp("..", name.data)) { 3113805b5d98SGreg Kurz err = -ENOTEMPTY; 3114805b5d98SGreg Kurz goto out_nofid; 3115805b5d98SGreg Kurz } 3116805b5d98SGreg Kurz 311767e87345SKeno Fischer if (flags & ~P9_DOTL_AT_REMOVEDIR) { 311867e87345SKeno Fischer err = -EINVAL; 311967e87345SKeno Fischer goto out_nofid; 312067e87345SKeno Fischer } 312167e87345SKeno Fischer 312267e87345SKeno Fischer if (flags & P9_DOTL_AT_REMOVEDIR) { 312367e87345SKeno Fischer rflags |= AT_REMOVEDIR; 312467e87345SKeno Fischer } 312567e87345SKeno Fischer 312660ce86c7SWei Liu dfidp = get_fid(pdu, dfid); 312760ce86c7SWei Liu if (dfidp == NULL) { 312860ce86c7SWei Liu err = -EINVAL; 312960ce86c7SWei Liu goto out_nofid; 313060ce86c7SWei Liu } 313160ce86c7SWei Liu /* 313260ce86c7SWei Liu * IF the file is unlinked, we cannot reopen 313360ce86c7SWei Liu * the file later. So don't reclaim fd 313460ce86c7SWei Liu */ 313560ce86c7SWei Liu v9fs_path_init(&path); 313660ce86c7SWei Liu err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); 313760ce86c7SWei Liu if (err < 0) { 313860ce86c7SWei Liu goto out_err; 313960ce86c7SWei Liu } 314060ce86c7SWei Liu err = v9fs_mark_fids_unreclaim(pdu, &path); 314160ce86c7SWei Liu if (err < 0) { 314260ce86c7SWei Liu goto out_err; 314360ce86c7SWei Liu } 314467e87345SKeno Fischer err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); 314560ce86c7SWei Liu if (!err) { 314660ce86c7SWei Liu err = offset; 314760ce86c7SWei Liu } 314860ce86c7SWei Liu out_err: 314960ce86c7SWei Liu put_fid(pdu, dfidp); 315060ce86c7SWei Liu v9fs_path_free(&path); 315160ce86c7SWei Liu out_nofid: 315260ce86c7SWei Liu pdu_complete(pdu, err); 315360ce86c7SWei Liu v9fs_string_free(&name); 315460ce86c7SWei Liu } 315560ce86c7SWei Liu 315660ce86c7SWei Liu 315760ce86c7SWei Liu /* Only works with path name based fid */ 31588440e22eSGreg Kurz static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, 31598440e22eSGreg Kurz int32_t newdirfid, 31608440e22eSGreg Kurz V9fsString *name) 316160ce86c7SWei Liu { 316260ce86c7SWei Liu int err = 0; 316360ce86c7SWei Liu V9fsPath new_path; 316460ce86c7SWei Liu V9fsFidState *tfidp; 316560ce86c7SWei Liu V9fsState *s = pdu->s; 316660ce86c7SWei Liu V9fsFidState *dirfidp = NULL; 316760ce86c7SWei Liu 316860ce86c7SWei Liu v9fs_path_init(&new_path); 316960ce86c7SWei Liu if (newdirfid != -1) { 317060ce86c7SWei Liu dirfidp = get_fid(pdu, newdirfid); 317160ce86c7SWei Liu if (dirfidp == NULL) { 3172b858e80aSDaniel Henrique Barboza return -ENOENT; 317360ce86c7SWei Liu } 317449dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 317549dd946bSGreg Kurz err = -EINVAL; 317649dd946bSGreg Kurz goto out; 317749dd946bSGreg Kurz } 31784fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); 31794fa62005SGreg Kurz if (err < 0) { 31804fa62005SGreg Kurz goto out; 31814fa62005SGreg Kurz } 318260ce86c7SWei Liu } else { 31834d8bc733SJan Dakinevich char *dir_name = g_path_get_dirname(fidp->path.data); 31844d8bc733SJan Dakinevich V9fsPath dir_path; 31854d8bc733SJan Dakinevich 31864d8bc733SJan Dakinevich v9fs_path_init(&dir_path); 31874d8bc733SJan Dakinevich v9fs_path_sprintf(&dir_path, "%s", dir_name); 31884d8bc733SJan Dakinevich g_free(dir_name); 31894d8bc733SJan Dakinevich 31904d8bc733SJan Dakinevich err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); 31914d8bc733SJan Dakinevich v9fs_path_free(&dir_path); 31924fa62005SGreg Kurz if (err < 0) { 31934fa62005SGreg Kurz goto out; 31944fa62005SGreg Kurz } 319560ce86c7SWei Liu } 319660ce86c7SWei Liu err = v9fs_co_rename(pdu, &fidp->path, &new_path); 319760ce86c7SWei Liu if (err < 0) { 319860ce86c7SWei Liu goto out; 319960ce86c7SWei Liu } 320060ce86c7SWei Liu /* 320160ce86c7SWei Liu * Fixup fid's pointing to the old name to 320260ce86c7SWei Liu * start pointing to the new name 320360ce86c7SWei Liu */ 3204feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 320560ce86c7SWei Liu if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { 320660ce86c7SWei Liu /* replace the name */ 320760ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); 320860ce86c7SWei Liu } 320960ce86c7SWei Liu } 321060ce86c7SWei Liu out: 321160ce86c7SWei Liu if (dirfidp) { 321260ce86c7SWei Liu put_fid(pdu, dirfidp); 321360ce86c7SWei Liu } 321460ce86c7SWei Liu v9fs_path_free(&new_path); 321560ce86c7SWei Liu return err; 321660ce86c7SWei Liu } 321760ce86c7SWei Liu 321860ce86c7SWei Liu /* Only works with path name based fid */ 32198440e22eSGreg Kurz static void coroutine_fn v9fs_rename(void *opaque) 322060ce86c7SWei Liu { 322160ce86c7SWei Liu int32_t fid; 322260ce86c7SWei Liu ssize_t err = 0; 322360ce86c7SWei Liu size_t offset = 7; 322460ce86c7SWei Liu V9fsString name; 322560ce86c7SWei Liu int32_t newdirfid; 322660ce86c7SWei Liu V9fsFidState *fidp; 322760ce86c7SWei Liu V9fsPDU *pdu = opaque; 322860ce86c7SWei Liu V9fsState *s = pdu->s; 322960ce86c7SWei Liu 323060ce86c7SWei Liu v9fs_string_init(&name); 323160ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); 323260ce86c7SWei Liu if (err < 0) { 323360ce86c7SWei Liu goto out_nofid; 323460ce86c7SWei Liu } 3235fff39a7aSGreg Kurz 3236fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3237fff39a7aSGreg Kurz err = -ENOENT; 3238fff39a7aSGreg Kurz goto out_nofid; 3239fff39a7aSGreg Kurz } 3240fff39a7aSGreg Kurz 3241805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3242805b5d98SGreg Kurz err = -EISDIR; 3243805b5d98SGreg Kurz goto out_nofid; 3244805b5d98SGreg Kurz } 3245805b5d98SGreg Kurz 324660ce86c7SWei Liu fidp = get_fid(pdu, fid); 324760ce86c7SWei Liu if (fidp == NULL) { 324860ce86c7SWei Liu err = -ENOENT; 324960ce86c7SWei Liu goto out_nofid; 325060ce86c7SWei Liu } 325149dd946bSGreg Kurz if (fidp->fid_type != P9_FID_NONE) { 325249dd946bSGreg Kurz err = -EINVAL; 325349dd946bSGreg Kurz goto out; 325449dd946bSGreg Kurz } 325560ce86c7SWei Liu /* if fs driver is not path based, return EOPNOTSUPP */ 325660ce86c7SWei Liu if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { 325760ce86c7SWei Liu err = -EOPNOTSUPP; 325860ce86c7SWei Liu goto out; 325960ce86c7SWei Liu } 326060ce86c7SWei Liu v9fs_path_write_lock(s); 326160ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); 326260ce86c7SWei Liu v9fs_path_unlock(s); 326360ce86c7SWei Liu if (!err) { 326460ce86c7SWei Liu err = offset; 326560ce86c7SWei Liu } 326660ce86c7SWei Liu out: 326760ce86c7SWei Liu put_fid(pdu, fidp); 326860ce86c7SWei Liu out_nofid: 326960ce86c7SWei Liu pdu_complete(pdu, err); 327060ce86c7SWei Liu v9fs_string_free(&name); 327160ce86c7SWei Liu } 327260ce86c7SWei Liu 32734fa62005SGreg Kurz static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, 32748440e22eSGreg Kurz V9fsString *old_name, 32758440e22eSGreg Kurz V9fsPath *newdir, 327660ce86c7SWei Liu V9fsString *new_name) 327760ce86c7SWei Liu { 327860ce86c7SWei Liu V9fsFidState *tfidp; 327960ce86c7SWei Liu V9fsPath oldpath, newpath; 328060ce86c7SWei Liu V9fsState *s = pdu->s; 32814fa62005SGreg Kurz int err; 328260ce86c7SWei Liu 328360ce86c7SWei Liu v9fs_path_init(&oldpath); 328460ce86c7SWei Liu v9fs_path_init(&newpath); 32854fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); 32864fa62005SGreg Kurz if (err < 0) { 32874fa62005SGreg Kurz goto out; 32884fa62005SGreg Kurz } 32894fa62005SGreg Kurz err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); 32904fa62005SGreg Kurz if (err < 0) { 32914fa62005SGreg Kurz goto out; 32924fa62005SGreg Kurz } 329360ce86c7SWei Liu 329460ce86c7SWei Liu /* 329560ce86c7SWei Liu * Fixup fid's pointing to the old name to 329660ce86c7SWei Liu * start pointing to the new name 329760ce86c7SWei Liu */ 3298feabd6cfSGreg Kurz QSIMPLEQ_FOREACH(tfidp, &s->fid_list, next) { 329960ce86c7SWei Liu if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { 330060ce86c7SWei Liu /* replace the name */ 330160ce86c7SWei Liu v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); 330260ce86c7SWei Liu } 330360ce86c7SWei Liu } 33044fa62005SGreg Kurz out: 330560ce86c7SWei Liu v9fs_path_free(&oldpath); 330660ce86c7SWei Liu v9fs_path_free(&newpath); 33074fa62005SGreg Kurz return err; 330860ce86c7SWei Liu } 330960ce86c7SWei Liu 33108440e22eSGreg Kurz static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, 33118440e22eSGreg Kurz V9fsString *old_name, 33128440e22eSGreg Kurz int32_t newdirfid, 331360ce86c7SWei Liu V9fsString *new_name) 331460ce86c7SWei Liu { 331560ce86c7SWei Liu int err = 0; 331660ce86c7SWei Liu V9fsState *s = pdu->s; 331760ce86c7SWei Liu V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; 331860ce86c7SWei Liu 331960ce86c7SWei Liu olddirfidp = get_fid(pdu, olddirfid); 332060ce86c7SWei Liu if (olddirfidp == NULL) { 332160ce86c7SWei Liu err = -ENOENT; 332260ce86c7SWei Liu goto out; 332360ce86c7SWei Liu } 332460ce86c7SWei Liu if (newdirfid != -1) { 332560ce86c7SWei Liu newdirfidp = get_fid(pdu, newdirfid); 332660ce86c7SWei Liu if (newdirfidp == NULL) { 332760ce86c7SWei Liu err = -ENOENT; 332860ce86c7SWei Liu goto out; 332960ce86c7SWei Liu } 333060ce86c7SWei Liu } else { 333160ce86c7SWei Liu newdirfidp = get_fid(pdu, olddirfid); 333260ce86c7SWei Liu } 333360ce86c7SWei Liu 333460ce86c7SWei Liu err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, 333560ce86c7SWei Liu &newdirfidp->path, new_name); 333660ce86c7SWei Liu if (err < 0) { 333760ce86c7SWei Liu goto out; 333860ce86c7SWei Liu } 333960ce86c7SWei Liu if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 334060ce86c7SWei Liu /* Only for path based fid we need to do the below fixup */ 33414fa62005SGreg Kurz err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, 334260ce86c7SWei Liu &newdirfidp->path, new_name); 334360ce86c7SWei Liu } 334460ce86c7SWei Liu out: 334560ce86c7SWei Liu if (olddirfidp) { 334660ce86c7SWei Liu put_fid(pdu, olddirfidp); 334760ce86c7SWei Liu } 334860ce86c7SWei Liu if (newdirfidp) { 334960ce86c7SWei Liu put_fid(pdu, newdirfidp); 335060ce86c7SWei Liu } 335160ce86c7SWei Liu return err; 335260ce86c7SWei Liu } 335360ce86c7SWei Liu 33548440e22eSGreg Kurz static void coroutine_fn v9fs_renameat(void *opaque) 335560ce86c7SWei Liu { 335660ce86c7SWei Liu ssize_t err = 0; 335760ce86c7SWei Liu size_t offset = 7; 335860ce86c7SWei Liu V9fsPDU *pdu = opaque; 335960ce86c7SWei Liu V9fsState *s = pdu->s; 336060ce86c7SWei Liu int32_t olddirfid, newdirfid; 336160ce86c7SWei Liu V9fsString old_name, new_name; 336260ce86c7SWei Liu 336360ce86c7SWei Liu v9fs_string_init(&old_name); 336460ce86c7SWei Liu v9fs_string_init(&new_name); 336560ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, 336660ce86c7SWei Liu &old_name, &newdirfid, &new_name); 336760ce86c7SWei Liu if (err < 0) { 336860ce86c7SWei Liu goto out_err; 336960ce86c7SWei Liu } 337060ce86c7SWei Liu 3371fff39a7aSGreg Kurz if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { 3372fff39a7aSGreg Kurz err = -ENOENT; 3373fff39a7aSGreg Kurz goto out_err; 3374fff39a7aSGreg Kurz } 3375fff39a7aSGreg Kurz 3376805b5d98SGreg Kurz if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || 3377805b5d98SGreg Kurz !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { 3378805b5d98SGreg Kurz err = -EISDIR; 3379805b5d98SGreg Kurz goto out_err; 3380805b5d98SGreg Kurz } 3381805b5d98SGreg Kurz 338260ce86c7SWei Liu v9fs_path_write_lock(s); 338360ce86c7SWei Liu err = v9fs_complete_renameat(pdu, olddirfid, 338460ce86c7SWei Liu &old_name, newdirfid, &new_name); 338560ce86c7SWei Liu v9fs_path_unlock(s); 338660ce86c7SWei Liu if (!err) { 338760ce86c7SWei Liu err = offset; 338860ce86c7SWei Liu } 338960ce86c7SWei Liu 339060ce86c7SWei Liu out_err: 339160ce86c7SWei Liu pdu_complete(pdu, err); 339260ce86c7SWei Liu v9fs_string_free(&old_name); 339360ce86c7SWei Liu v9fs_string_free(&new_name); 339460ce86c7SWei Liu } 339560ce86c7SWei Liu 33968440e22eSGreg Kurz static void coroutine_fn v9fs_wstat(void *opaque) 339760ce86c7SWei Liu { 339860ce86c7SWei Liu int32_t fid; 339960ce86c7SWei Liu int err = 0; 340060ce86c7SWei Liu int16_t unused; 340160ce86c7SWei Liu V9fsStat v9stat; 340260ce86c7SWei Liu size_t offset = 7; 340360ce86c7SWei Liu struct stat stbuf; 340460ce86c7SWei Liu V9fsFidState *fidp; 340560ce86c7SWei Liu V9fsPDU *pdu = opaque; 34061d203986SGreg Kurz V9fsState *s = pdu->s; 340760ce86c7SWei Liu 340860ce86c7SWei Liu v9fs_stat_init(&v9stat); 340960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); 341060ce86c7SWei Liu if (err < 0) { 341160ce86c7SWei Liu goto out_nofid; 341260ce86c7SWei Liu } 341360ce86c7SWei Liu trace_v9fs_wstat(pdu->tag, pdu->id, fid, 341460ce86c7SWei Liu v9stat.mode, v9stat.atime, v9stat.mtime); 341560ce86c7SWei Liu 341660ce86c7SWei Liu fidp = get_fid(pdu, fid); 341760ce86c7SWei Liu if (fidp == NULL) { 341860ce86c7SWei Liu err = -EINVAL; 341960ce86c7SWei Liu goto out_nofid; 342060ce86c7SWei Liu } 342160ce86c7SWei Liu /* do we need to sync the file? */ 342260ce86c7SWei Liu if (donttouch_stat(&v9stat)) { 342360ce86c7SWei Liu err = v9fs_co_fsync(pdu, fidp, 0); 342460ce86c7SWei Liu goto out; 342560ce86c7SWei Liu } 342660ce86c7SWei Liu if (v9stat.mode != -1) { 342760ce86c7SWei Liu uint32_t v9_mode; 342860ce86c7SWei Liu err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); 342960ce86c7SWei Liu if (err < 0) { 343060ce86c7SWei Liu goto out; 343160ce86c7SWei Liu } 343260ce86c7SWei Liu v9_mode = stat_to_v9mode(&stbuf); 343360ce86c7SWei Liu if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != 343460ce86c7SWei Liu (v9_mode & P9_STAT_MODE_TYPE_BITS)) { 343560ce86c7SWei Liu /* Attempting to change the type */ 343660ce86c7SWei Liu err = -EIO; 343760ce86c7SWei Liu goto out; 343860ce86c7SWei Liu } 343960ce86c7SWei Liu err = v9fs_co_chmod(pdu, &fidp->path, 344060ce86c7SWei Liu v9mode_to_mode(v9stat.mode, 344160ce86c7SWei Liu &v9stat.extension)); 344260ce86c7SWei Liu if (err < 0) { 344360ce86c7SWei Liu goto out; 344460ce86c7SWei Liu } 344560ce86c7SWei Liu } 344660ce86c7SWei Liu if (v9stat.mtime != -1 || v9stat.atime != -1) { 344760ce86c7SWei Liu struct timespec times[2]; 344860ce86c7SWei Liu if (v9stat.atime != -1) { 344960ce86c7SWei Liu times[0].tv_sec = v9stat.atime; 345060ce86c7SWei Liu times[0].tv_nsec = 0; 345160ce86c7SWei Liu } else { 345260ce86c7SWei Liu times[0].tv_nsec = UTIME_OMIT; 345360ce86c7SWei Liu } 345460ce86c7SWei Liu if (v9stat.mtime != -1) { 345560ce86c7SWei Liu times[1].tv_sec = v9stat.mtime; 345660ce86c7SWei Liu times[1].tv_nsec = 0; 345760ce86c7SWei Liu } else { 345860ce86c7SWei Liu times[1].tv_nsec = UTIME_OMIT; 345960ce86c7SWei Liu } 346060ce86c7SWei Liu err = v9fs_co_utimensat(pdu, &fidp->path, times); 346160ce86c7SWei Liu if (err < 0) { 346260ce86c7SWei Liu goto out; 346360ce86c7SWei Liu } 346460ce86c7SWei Liu } 346560ce86c7SWei Liu if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { 346660ce86c7SWei Liu err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); 346760ce86c7SWei Liu if (err < 0) { 346860ce86c7SWei Liu goto out; 346960ce86c7SWei Liu } 347060ce86c7SWei Liu } 347160ce86c7SWei Liu if (v9stat.name.size != 0) { 34721d203986SGreg Kurz v9fs_path_write_lock(s); 347360ce86c7SWei Liu err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); 34741d203986SGreg Kurz v9fs_path_unlock(s); 347560ce86c7SWei Liu if (err < 0) { 347660ce86c7SWei Liu goto out; 347760ce86c7SWei Liu } 347860ce86c7SWei Liu } 347960ce86c7SWei Liu if (v9stat.length != -1) { 348060ce86c7SWei Liu err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); 348160ce86c7SWei Liu if (err < 0) { 348260ce86c7SWei Liu goto out; 348360ce86c7SWei Liu } 348460ce86c7SWei Liu } 348560ce86c7SWei Liu err = offset; 348660ce86c7SWei Liu out: 348760ce86c7SWei Liu put_fid(pdu, fidp); 348860ce86c7SWei Liu out_nofid: 348960ce86c7SWei Liu v9fs_stat_free(&v9stat); 349060ce86c7SWei Liu pdu_complete(pdu, err); 349160ce86c7SWei Liu } 349260ce86c7SWei Liu 349360ce86c7SWei Liu static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) 349460ce86c7SWei Liu { 349560ce86c7SWei Liu uint32_t f_type; 349660ce86c7SWei Liu uint32_t f_bsize; 349760ce86c7SWei Liu uint64_t f_blocks; 349860ce86c7SWei Liu uint64_t f_bfree; 349960ce86c7SWei Liu uint64_t f_bavail; 350060ce86c7SWei Liu uint64_t f_files; 350160ce86c7SWei Liu uint64_t f_ffree; 350260ce86c7SWei Liu uint64_t fsid_val; 350360ce86c7SWei Liu uint32_t f_namelen; 350460ce86c7SWei Liu size_t offset = 7; 350560ce86c7SWei Liu int32_t bsize_factor; 350660ce86c7SWei Liu 350760ce86c7SWei Liu /* 350860ce86c7SWei Liu * compute bsize factor based on host file system block size 350960ce86c7SWei Liu * and client msize 351060ce86c7SWei Liu */ 351160ce86c7SWei Liu bsize_factor = (s->msize - P9_IOHDRSZ) / stbuf->f_bsize; 351260ce86c7SWei Liu if (!bsize_factor) { 351360ce86c7SWei Liu bsize_factor = 1; 351460ce86c7SWei Liu } 351560ce86c7SWei Liu f_type = stbuf->f_type; 351660ce86c7SWei Liu f_bsize = stbuf->f_bsize; 351760ce86c7SWei Liu f_bsize *= bsize_factor; 351860ce86c7SWei Liu /* 351960ce86c7SWei Liu * f_bsize is adjusted(multiplied) by bsize factor, so we need to 352060ce86c7SWei Liu * adjust(divide) the number of blocks, free blocks and available 352160ce86c7SWei Liu * blocks by bsize factor 352260ce86c7SWei Liu */ 352360ce86c7SWei Liu f_blocks = stbuf->f_blocks / bsize_factor; 352460ce86c7SWei Liu f_bfree = stbuf->f_bfree / bsize_factor; 352560ce86c7SWei Liu f_bavail = stbuf->f_bavail / bsize_factor; 352660ce86c7SWei Liu f_files = stbuf->f_files; 352760ce86c7SWei Liu f_ffree = stbuf->f_ffree; 3528*f41db099SKeno Fischer #ifdef CONFIG_DARWIN 3529*f41db099SKeno Fischer fsid_val = (unsigned int)stbuf->f_fsid.val[0] | 3530*f41db099SKeno Fischer (unsigned long long)stbuf->f_fsid.val[1] << 32; 3531*f41db099SKeno Fischer f_namelen = NAME_MAX; 3532*f41db099SKeno Fischer #else 353360ce86c7SWei Liu fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | 353460ce86c7SWei Liu (unsigned long long)stbuf->f_fsid.__val[1] << 32; 353560ce86c7SWei Liu f_namelen = stbuf->f_namelen; 3536*f41db099SKeno Fischer #endif 353760ce86c7SWei Liu 353860ce86c7SWei Liu return pdu_marshal(pdu, offset, "ddqqqqqqd", 353960ce86c7SWei Liu f_type, f_bsize, f_blocks, f_bfree, 354060ce86c7SWei Liu f_bavail, f_files, f_ffree, 354160ce86c7SWei Liu fsid_val, f_namelen); 354260ce86c7SWei Liu } 354360ce86c7SWei Liu 35448440e22eSGreg Kurz static void coroutine_fn v9fs_statfs(void *opaque) 354560ce86c7SWei Liu { 354660ce86c7SWei Liu int32_t fid; 354760ce86c7SWei Liu ssize_t retval = 0; 354860ce86c7SWei Liu size_t offset = 7; 354960ce86c7SWei Liu V9fsFidState *fidp; 355060ce86c7SWei Liu struct statfs stbuf; 355160ce86c7SWei Liu V9fsPDU *pdu = opaque; 355260ce86c7SWei Liu V9fsState *s = pdu->s; 355360ce86c7SWei Liu 355460ce86c7SWei Liu retval = pdu_unmarshal(pdu, offset, "d", &fid); 355560ce86c7SWei Liu if (retval < 0) { 355660ce86c7SWei Liu goto out_nofid; 355760ce86c7SWei Liu } 355860ce86c7SWei Liu fidp = get_fid(pdu, fid); 355960ce86c7SWei Liu if (fidp == NULL) { 356060ce86c7SWei Liu retval = -ENOENT; 356160ce86c7SWei Liu goto out_nofid; 356260ce86c7SWei Liu } 356360ce86c7SWei Liu retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); 356460ce86c7SWei Liu if (retval < 0) { 356560ce86c7SWei Liu goto out; 356660ce86c7SWei Liu } 356760ce86c7SWei Liu retval = v9fs_fill_statfs(s, pdu, &stbuf); 356860ce86c7SWei Liu if (retval < 0) { 356960ce86c7SWei Liu goto out; 357060ce86c7SWei Liu } 357160ce86c7SWei Liu retval += offset; 357260ce86c7SWei Liu out: 357360ce86c7SWei Liu put_fid(pdu, fidp); 357460ce86c7SWei Liu out_nofid: 357560ce86c7SWei Liu pdu_complete(pdu, retval); 357660ce86c7SWei Liu } 357760ce86c7SWei Liu 35788440e22eSGreg Kurz static void coroutine_fn v9fs_mknod(void *opaque) 357960ce86c7SWei Liu { 358060ce86c7SWei Liu 358160ce86c7SWei Liu int mode; 358260ce86c7SWei Liu gid_t gid; 358360ce86c7SWei Liu int32_t fid; 358460ce86c7SWei Liu V9fsQID qid; 358560ce86c7SWei Liu int err = 0; 358660ce86c7SWei Liu int major, minor; 358760ce86c7SWei Liu size_t offset = 7; 358860ce86c7SWei Liu V9fsString name; 358960ce86c7SWei Liu struct stat stbuf; 359060ce86c7SWei Liu V9fsFidState *fidp; 359160ce86c7SWei Liu V9fsPDU *pdu = opaque; 359260ce86c7SWei Liu 359360ce86c7SWei Liu v9fs_string_init(&name); 359460ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, 359560ce86c7SWei Liu &major, &minor, &gid); 359660ce86c7SWei Liu if (err < 0) { 359760ce86c7SWei Liu goto out_nofid; 359860ce86c7SWei Liu } 359960ce86c7SWei Liu trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); 360060ce86c7SWei Liu 3601fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3602fff39a7aSGreg Kurz err = -ENOENT; 3603fff39a7aSGreg Kurz goto out_nofid; 3604fff39a7aSGreg Kurz } 3605fff39a7aSGreg Kurz 3606805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3607805b5d98SGreg Kurz err = -EEXIST; 3608805b5d98SGreg Kurz goto out_nofid; 3609805b5d98SGreg Kurz } 3610805b5d98SGreg Kurz 361160ce86c7SWei Liu fidp = get_fid(pdu, fid); 361260ce86c7SWei Liu if (fidp == NULL) { 361360ce86c7SWei Liu err = -ENOENT; 361460ce86c7SWei Liu goto out_nofid; 361560ce86c7SWei Liu } 361660ce86c7SWei Liu err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, 361760ce86c7SWei Liu makedev(major, minor), mode, &stbuf); 361860ce86c7SWei Liu if (err < 0) { 361960ce86c7SWei Liu goto out; 362060ce86c7SWei Liu } 36213b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 36223b5ee9e8SAntonios Motakis if (err < 0) { 36233b5ee9e8SAntonios Motakis goto out; 36243b5ee9e8SAntonios Motakis } 362560ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 362660ce86c7SWei Liu if (err < 0) { 362760ce86c7SWei Liu goto out; 362860ce86c7SWei Liu } 362960ce86c7SWei Liu err += offset; 363060ce86c7SWei Liu trace_v9fs_mknod_return(pdu->tag, pdu->id, 363160ce86c7SWei Liu qid.type, qid.version, qid.path); 363260ce86c7SWei Liu out: 363360ce86c7SWei Liu put_fid(pdu, fidp); 363460ce86c7SWei Liu out_nofid: 363560ce86c7SWei Liu pdu_complete(pdu, err); 363660ce86c7SWei Liu v9fs_string_free(&name); 363760ce86c7SWei Liu } 363860ce86c7SWei Liu 363960ce86c7SWei Liu /* 364060ce86c7SWei Liu * Implement posix byte range locking code 364160ce86c7SWei Liu * Server side handling of locking code is very simple, because 9p server in 364260ce86c7SWei Liu * QEMU can handle only one client. And most of the lock handling 364360ce86c7SWei Liu * (like conflict, merging) etc is done by the VFS layer itself, so no need to 364460ce86c7SWei Liu * do any thing in * qemu 9p server side lock code path. 364560ce86c7SWei Liu * So when a TLOCK request comes, always return success 364660ce86c7SWei Liu */ 36478440e22eSGreg Kurz static void coroutine_fn v9fs_lock(void *opaque) 364860ce86c7SWei Liu { 364960ce86c7SWei Liu V9fsFlock flock; 365060ce86c7SWei Liu size_t offset = 7; 365160ce86c7SWei Liu struct stat stbuf; 365260ce86c7SWei Liu V9fsFidState *fidp; 365360ce86c7SWei Liu int32_t fid, err = 0; 365460ce86c7SWei Liu V9fsPDU *pdu = opaque; 365560ce86c7SWei Liu 365660ce86c7SWei Liu v9fs_string_init(&flock.client_id); 365760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, 365860ce86c7SWei Liu &flock.flags, &flock.start, &flock.length, 365960ce86c7SWei Liu &flock.proc_id, &flock.client_id); 366060ce86c7SWei Liu if (err < 0) { 366160ce86c7SWei Liu goto out_nofid; 366260ce86c7SWei Liu } 366360ce86c7SWei Liu trace_v9fs_lock(pdu->tag, pdu->id, fid, 366460ce86c7SWei Liu flock.type, flock.start, flock.length); 366560ce86c7SWei Liu 366660ce86c7SWei Liu 366760ce86c7SWei Liu /* We support only block flag now (that too ignored currently) */ 366860ce86c7SWei Liu if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { 366960ce86c7SWei Liu err = -EINVAL; 367060ce86c7SWei Liu goto out_nofid; 367160ce86c7SWei Liu } 367260ce86c7SWei Liu fidp = get_fid(pdu, fid); 367360ce86c7SWei Liu if (fidp == NULL) { 367460ce86c7SWei Liu err = -ENOENT; 367560ce86c7SWei Liu goto out_nofid; 367660ce86c7SWei Liu } 367760ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 367860ce86c7SWei Liu if (err < 0) { 367960ce86c7SWei Liu goto out; 368060ce86c7SWei Liu } 36814bae2b39SPaolo Bonzini err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); 36824bae2b39SPaolo Bonzini if (err < 0) { 36834bae2b39SPaolo Bonzini goto out; 36844bae2b39SPaolo Bonzini } 36854bae2b39SPaolo Bonzini err += offset; 36864bae2b39SPaolo Bonzini trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); 368760ce86c7SWei Liu out: 368860ce86c7SWei Liu put_fid(pdu, fidp); 368960ce86c7SWei Liu out_nofid: 369060ce86c7SWei Liu pdu_complete(pdu, err); 369160ce86c7SWei Liu v9fs_string_free(&flock.client_id); 369260ce86c7SWei Liu } 369360ce86c7SWei Liu 369460ce86c7SWei Liu /* 369560ce86c7SWei Liu * When a TGETLOCK request comes, always return success because all lock 369660ce86c7SWei Liu * handling is done by client's VFS layer. 369760ce86c7SWei Liu */ 36988440e22eSGreg Kurz static void coroutine_fn v9fs_getlock(void *opaque) 369960ce86c7SWei Liu { 370060ce86c7SWei Liu size_t offset = 7; 370160ce86c7SWei Liu struct stat stbuf; 370260ce86c7SWei Liu V9fsFidState *fidp; 370360ce86c7SWei Liu V9fsGetlock glock; 370460ce86c7SWei Liu int32_t fid, err = 0; 370560ce86c7SWei Liu V9fsPDU *pdu = opaque; 370660ce86c7SWei Liu 370760ce86c7SWei Liu v9fs_string_init(&glock.client_id); 370860ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, 370960ce86c7SWei Liu &glock.start, &glock.length, &glock.proc_id, 371060ce86c7SWei Liu &glock.client_id); 371160ce86c7SWei Liu if (err < 0) { 371260ce86c7SWei Liu goto out_nofid; 371360ce86c7SWei Liu } 371460ce86c7SWei Liu trace_v9fs_getlock(pdu->tag, pdu->id, fid, 371560ce86c7SWei Liu glock.type, glock.start, glock.length); 371660ce86c7SWei Liu 371760ce86c7SWei Liu fidp = get_fid(pdu, fid); 371860ce86c7SWei Liu if (fidp == NULL) { 371960ce86c7SWei Liu err = -ENOENT; 372060ce86c7SWei Liu goto out_nofid; 372160ce86c7SWei Liu } 372260ce86c7SWei Liu err = v9fs_co_fstat(pdu, fidp, &stbuf); 372360ce86c7SWei Liu if (err < 0) { 372460ce86c7SWei Liu goto out; 372560ce86c7SWei Liu } 372660ce86c7SWei Liu glock.type = P9_LOCK_TYPE_UNLCK; 372760ce86c7SWei Liu err = pdu_marshal(pdu, offset, "bqqds", glock.type, 372860ce86c7SWei Liu glock.start, glock.length, glock.proc_id, 372960ce86c7SWei Liu &glock.client_id); 373060ce86c7SWei Liu if (err < 0) { 373160ce86c7SWei Liu goto out; 373260ce86c7SWei Liu } 373360ce86c7SWei Liu err += offset; 373460ce86c7SWei Liu trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, 373560ce86c7SWei Liu glock.length, glock.proc_id); 373660ce86c7SWei Liu out: 373760ce86c7SWei Liu put_fid(pdu, fidp); 373860ce86c7SWei Liu out_nofid: 373960ce86c7SWei Liu pdu_complete(pdu, err); 374060ce86c7SWei Liu v9fs_string_free(&glock.client_id); 374160ce86c7SWei Liu } 374260ce86c7SWei Liu 37438440e22eSGreg Kurz static void coroutine_fn v9fs_mkdir(void *opaque) 374460ce86c7SWei Liu { 374560ce86c7SWei Liu V9fsPDU *pdu = opaque; 374660ce86c7SWei Liu size_t offset = 7; 374760ce86c7SWei Liu int32_t fid; 374860ce86c7SWei Liu struct stat stbuf; 374960ce86c7SWei Liu V9fsQID qid; 375060ce86c7SWei Liu V9fsString name; 375160ce86c7SWei Liu V9fsFidState *fidp; 375260ce86c7SWei Liu gid_t gid; 375360ce86c7SWei Liu int mode; 375460ce86c7SWei Liu int err = 0; 375560ce86c7SWei Liu 375660ce86c7SWei Liu v9fs_string_init(&name); 375760ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); 375860ce86c7SWei Liu if (err < 0) { 375960ce86c7SWei Liu goto out_nofid; 376060ce86c7SWei Liu } 376160ce86c7SWei Liu trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); 376260ce86c7SWei Liu 3763fff39a7aSGreg Kurz if (name_is_illegal(name.data)) { 3764fff39a7aSGreg Kurz err = -ENOENT; 3765fff39a7aSGreg Kurz goto out_nofid; 3766fff39a7aSGreg Kurz } 3767fff39a7aSGreg Kurz 3768805b5d98SGreg Kurz if (!strcmp(".", name.data) || !strcmp("..", name.data)) { 3769805b5d98SGreg Kurz err = -EEXIST; 3770805b5d98SGreg Kurz goto out_nofid; 3771805b5d98SGreg Kurz } 3772805b5d98SGreg Kurz 377360ce86c7SWei Liu fidp = get_fid(pdu, fid); 377460ce86c7SWei Liu if (fidp == NULL) { 377560ce86c7SWei Liu err = -ENOENT; 377660ce86c7SWei Liu goto out_nofid; 377760ce86c7SWei Liu } 377860ce86c7SWei Liu err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); 377960ce86c7SWei Liu if (err < 0) { 378060ce86c7SWei Liu goto out; 378160ce86c7SWei Liu } 37823b5ee9e8SAntonios Motakis err = stat_to_qid(pdu, &stbuf, &qid); 37833b5ee9e8SAntonios Motakis if (err < 0) { 37843b5ee9e8SAntonios Motakis goto out; 37853b5ee9e8SAntonios Motakis } 378660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "Q", &qid); 378760ce86c7SWei Liu if (err < 0) { 378860ce86c7SWei Liu goto out; 378960ce86c7SWei Liu } 379060ce86c7SWei Liu err += offset; 379160ce86c7SWei Liu trace_v9fs_mkdir_return(pdu->tag, pdu->id, 379260ce86c7SWei Liu qid.type, qid.version, qid.path, err); 379360ce86c7SWei Liu out: 379460ce86c7SWei Liu put_fid(pdu, fidp); 379560ce86c7SWei Liu out_nofid: 379660ce86c7SWei Liu pdu_complete(pdu, err); 379760ce86c7SWei Liu v9fs_string_free(&name); 379860ce86c7SWei Liu } 379960ce86c7SWei Liu 38008440e22eSGreg Kurz static void coroutine_fn v9fs_xattrwalk(void *opaque) 380160ce86c7SWei Liu { 380260ce86c7SWei Liu int64_t size; 380360ce86c7SWei Liu V9fsString name; 380460ce86c7SWei Liu ssize_t err = 0; 380560ce86c7SWei Liu size_t offset = 7; 380660ce86c7SWei Liu int32_t fid, newfid; 380760ce86c7SWei Liu V9fsFidState *file_fidp; 380860ce86c7SWei Liu V9fsFidState *xattr_fidp = NULL; 380960ce86c7SWei Liu V9fsPDU *pdu = opaque; 381060ce86c7SWei Liu V9fsState *s = pdu->s; 381160ce86c7SWei Liu 381260ce86c7SWei Liu v9fs_string_init(&name); 381360ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); 381460ce86c7SWei Liu if (err < 0) { 381560ce86c7SWei Liu goto out_nofid; 381660ce86c7SWei Liu } 381760ce86c7SWei Liu trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); 381860ce86c7SWei Liu 381960ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 382060ce86c7SWei Liu if (file_fidp == NULL) { 382160ce86c7SWei Liu err = -ENOENT; 382260ce86c7SWei Liu goto out_nofid; 382360ce86c7SWei Liu } 382460ce86c7SWei Liu xattr_fidp = alloc_fid(s, newfid); 382560ce86c7SWei Liu if (xattr_fidp == NULL) { 382660ce86c7SWei Liu err = -EINVAL; 382760ce86c7SWei Liu goto out; 382860ce86c7SWei Liu } 382960ce86c7SWei Liu v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); 3830ba42ebb8SLi Qiang if (!v9fs_string_size(&name)) { 383160ce86c7SWei Liu /* 383260ce86c7SWei Liu * listxattr request. Get the size first 383360ce86c7SWei Liu */ 383460ce86c7SWei Liu size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); 383560ce86c7SWei Liu if (size < 0) { 383660ce86c7SWei Liu err = size; 383760ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 383860ce86c7SWei Liu goto out; 383960ce86c7SWei Liu } 384060ce86c7SWei Liu /* 384160ce86c7SWei Liu * Read the xattr value 384260ce86c7SWei Liu */ 384360ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 384460ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3845dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38467bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3847a647502cSKeno Fischer if (size) { 384860ce86c7SWei Liu err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, 384960ce86c7SWei Liu xattr_fidp->fs.xattr.value, 385060ce86c7SWei Liu xattr_fidp->fs.xattr.len); 385160ce86c7SWei Liu if (err < 0) { 385260ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 385360ce86c7SWei Liu goto out; 385460ce86c7SWei Liu } 385560ce86c7SWei Liu } 385660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 385760ce86c7SWei Liu if (err < 0) { 385860ce86c7SWei Liu goto out; 385960ce86c7SWei Liu } 386060ce86c7SWei Liu err += offset; 386160ce86c7SWei Liu } else { 386260ce86c7SWei Liu /* 386360ce86c7SWei Liu * specific xattr fid. We check for xattr 386460ce86c7SWei Liu * presence also collect the xattr size 386560ce86c7SWei Liu */ 386660ce86c7SWei Liu size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 386760ce86c7SWei Liu &name, NULL, 0); 386860ce86c7SWei Liu if (size < 0) { 386960ce86c7SWei Liu err = size; 387060ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 387160ce86c7SWei Liu goto out; 387260ce86c7SWei Liu } 387360ce86c7SWei Liu /* 387460ce86c7SWei Liu * Read the xattr value 387560ce86c7SWei Liu */ 387660ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 387760ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 3878dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = true; 38797bd92756SPrasad J Pandit xattr_fidp->fs.xattr.value = g_malloc0(size); 3880a647502cSKeno Fischer if (size) { 388160ce86c7SWei Liu err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, 388260ce86c7SWei Liu &name, xattr_fidp->fs.xattr.value, 388360ce86c7SWei Liu xattr_fidp->fs.xattr.len); 388460ce86c7SWei Liu if (err < 0) { 388560ce86c7SWei Liu clunk_fid(s, xattr_fidp->fid); 388660ce86c7SWei Liu goto out; 388760ce86c7SWei Liu } 388860ce86c7SWei Liu } 388960ce86c7SWei Liu err = pdu_marshal(pdu, offset, "q", size); 389060ce86c7SWei Liu if (err < 0) { 389160ce86c7SWei Liu goto out; 389260ce86c7SWei Liu } 389360ce86c7SWei Liu err += offset; 389460ce86c7SWei Liu } 389560ce86c7SWei Liu trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); 389660ce86c7SWei Liu out: 389760ce86c7SWei Liu put_fid(pdu, file_fidp); 389860ce86c7SWei Liu if (xattr_fidp) { 389960ce86c7SWei Liu put_fid(pdu, xattr_fidp); 390060ce86c7SWei Liu } 390160ce86c7SWei Liu out_nofid: 390260ce86c7SWei Liu pdu_complete(pdu, err); 390360ce86c7SWei Liu v9fs_string_free(&name); 390460ce86c7SWei Liu } 390560ce86c7SWei Liu 39068440e22eSGreg Kurz static void coroutine_fn v9fs_xattrcreate(void *opaque) 390760ce86c7SWei Liu { 3908aca6897fSKeno Fischer int flags, rflags = 0; 390960ce86c7SWei Liu int32_t fid; 39103b79ef2cSGreg Kurz uint64_t size; 391160ce86c7SWei Liu ssize_t err = 0; 391260ce86c7SWei Liu V9fsString name; 391360ce86c7SWei Liu size_t offset = 7; 391460ce86c7SWei Liu V9fsFidState *file_fidp; 391560ce86c7SWei Liu V9fsFidState *xattr_fidp; 391660ce86c7SWei Liu V9fsPDU *pdu = opaque; 391760ce86c7SWei Liu 391860ce86c7SWei Liu v9fs_string_init(&name); 391960ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); 392060ce86c7SWei Liu if (err < 0) { 392160ce86c7SWei Liu goto out_nofid; 392260ce86c7SWei Liu } 392360ce86c7SWei Liu trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); 392460ce86c7SWei Liu 3925aca6897fSKeno Fischer if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { 3926aca6897fSKeno Fischer err = -EINVAL; 3927aca6897fSKeno Fischer goto out_nofid; 3928aca6897fSKeno Fischer } 3929aca6897fSKeno Fischer 3930aca6897fSKeno Fischer if (flags & P9_XATTR_CREATE) { 3931aca6897fSKeno Fischer rflags |= XATTR_CREATE; 3932aca6897fSKeno Fischer } 3933aca6897fSKeno Fischer 3934aca6897fSKeno Fischer if (flags & P9_XATTR_REPLACE) { 3935aca6897fSKeno Fischer rflags |= XATTR_REPLACE; 3936aca6897fSKeno Fischer } 3937aca6897fSKeno Fischer 39383b79ef2cSGreg Kurz if (size > XATTR_SIZE_MAX) { 39393b79ef2cSGreg Kurz err = -E2BIG; 39403b79ef2cSGreg Kurz goto out_nofid; 39413b79ef2cSGreg Kurz } 39423b79ef2cSGreg Kurz 394360ce86c7SWei Liu file_fidp = get_fid(pdu, fid); 394460ce86c7SWei Liu if (file_fidp == NULL) { 394560ce86c7SWei Liu err = -EINVAL; 394660ce86c7SWei Liu goto out_nofid; 394760ce86c7SWei Liu } 3948dd654e03SGreg Kurz if (file_fidp->fid_type != P9_FID_NONE) { 3949dd654e03SGreg Kurz err = -EINVAL; 3950dd654e03SGreg Kurz goto out_put_fid; 3951dd654e03SGreg Kurz } 3952dd654e03SGreg Kurz 395360ce86c7SWei Liu /* Make the file fid point to xattr */ 395460ce86c7SWei Liu xattr_fidp = file_fidp; 395560ce86c7SWei Liu xattr_fidp->fid_type = P9_FID_XATTR; 395660ce86c7SWei Liu xattr_fidp->fs.xattr.copied_len = 0; 3957dd28fbbcSLi Qiang xattr_fidp->fs.xattr.xattrwalk_fid = false; 395860ce86c7SWei Liu xattr_fidp->fs.xattr.len = size; 3959aca6897fSKeno Fischer xattr_fidp->fs.xattr.flags = rflags; 396060ce86c7SWei Liu v9fs_string_init(&xattr_fidp->fs.xattr.name); 396160ce86c7SWei Liu v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); 3962eb687602SLi Qiang xattr_fidp->fs.xattr.value = g_malloc0(size); 396360ce86c7SWei Liu err = offset; 3964dd654e03SGreg Kurz out_put_fid: 396560ce86c7SWei Liu put_fid(pdu, file_fidp); 396660ce86c7SWei Liu out_nofid: 396760ce86c7SWei Liu pdu_complete(pdu, err); 396860ce86c7SWei Liu v9fs_string_free(&name); 396960ce86c7SWei Liu } 397060ce86c7SWei Liu 39718440e22eSGreg Kurz static void coroutine_fn v9fs_readlink(void *opaque) 397260ce86c7SWei Liu { 397360ce86c7SWei Liu V9fsPDU *pdu = opaque; 397460ce86c7SWei Liu size_t offset = 7; 397560ce86c7SWei Liu V9fsString target; 397660ce86c7SWei Liu int32_t fid; 397760ce86c7SWei Liu int err = 0; 397860ce86c7SWei Liu V9fsFidState *fidp; 397960ce86c7SWei Liu 398060ce86c7SWei Liu err = pdu_unmarshal(pdu, offset, "d", &fid); 398160ce86c7SWei Liu if (err < 0) { 398260ce86c7SWei Liu goto out_nofid; 398360ce86c7SWei Liu } 398460ce86c7SWei Liu trace_v9fs_readlink(pdu->tag, pdu->id, fid); 398560ce86c7SWei Liu fidp = get_fid(pdu, fid); 398660ce86c7SWei Liu if (fidp == NULL) { 398760ce86c7SWei Liu err = -ENOENT; 398860ce86c7SWei Liu goto out_nofid; 398960ce86c7SWei Liu } 399060ce86c7SWei Liu 399160ce86c7SWei Liu v9fs_string_init(&target); 399260ce86c7SWei Liu err = v9fs_co_readlink(pdu, &fidp->path, &target); 399360ce86c7SWei Liu if (err < 0) { 399460ce86c7SWei Liu goto out; 399560ce86c7SWei Liu } 399660ce86c7SWei Liu err = pdu_marshal(pdu, offset, "s", &target); 399760ce86c7SWei Liu if (err < 0) { 399860ce86c7SWei Liu v9fs_string_free(&target); 399960ce86c7SWei Liu goto out; 400060ce86c7SWei Liu } 400160ce86c7SWei Liu err += offset; 400260ce86c7SWei Liu trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); 400360ce86c7SWei Liu v9fs_string_free(&target); 400460ce86c7SWei Liu out: 400560ce86c7SWei Liu put_fid(pdu, fidp); 400660ce86c7SWei Liu out_nofid: 400760ce86c7SWei Liu pdu_complete(pdu, err); 400860ce86c7SWei Liu } 400960ce86c7SWei Liu 401060ce86c7SWei Liu static CoroutineEntry *pdu_co_handlers[] = { 401160ce86c7SWei Liu [P9_TREADDIR] = v9fs_readdir, 401260ce86c7SWei Liu [P9_TSTATFS] = v9fs_statfs, 401360ce86c7SWei Liu [P9_TGETATTR] = v9fs_getattr, 401460ce86c7SWei Liu [P9_TSETATTR] = v9fs_setattr, 401560ce86c7SWei Liu [P9_TXATTRWALK] = v9fs_xattrwalk, 401660ce86c7SWei Liu [P9_TXATTRCREATE] = v9fs_xattrcreate, 401760ce86c7SWei Liu [P9_TMKNOD] = v9fs_mknod, 401860ce86c7SWei Liu [P9_TRENAME] = v9fs_rename, 401960ce86c7SWei Liu [P9_TLOCK] = v9fs_lock, 402060ce86c7SWei Liu [P9_TGETLOCK] = v9fs_getlock, 402160ce86c7SWei Liu [P9_TRENAMEAT] = v9fs_renameat, 402260ce86c7SWei Liu [P9_TREADLINK] = v9fs_readlink, 402360ce86c7SWei Liu [P9_TUNLINKAT] = v9fs_unlinkat, 402460ce86c7SWei Liu [P9_TMKDIR] = v9fs_mkdir, 402560ce86c7SWei Liu [P9_TVERSION] = v9fs_version, 402660ce86c7SWei Liu [P9_TLOPEN] = v9fs_open, 402760ce86c7SWei Liu [P9_TATTACH] = v9fs_attach, 402860ce86c7SWei Liu [P9_TSTAT] = v9fs_stat, 402960ce86c7SWei Liu [P9_TWALK] = v9fs_walk, 403060ce86c7SWei Liu [P9_TCLUNK] = v9fs_clunk, 403160ce86c7SWei Liu [P9_TFSYNC] = v9fs_fsync, 403260ce86c7SWei Liu [P9_TOPEN] = v9fs_open, 403360ce86c7SWei Liu [P9_TREAD] = v9fs_read, 403460ce86c7SWei Liu #if 0 403560ce86c7SWei Liu [P9_TAUTH] = v9fs_auth, 403660ce86c7SWei Liu #endif 403760ce86c7SWei Liu [P9_TFLUSH] = v9fs_flush, 403860ce86c7SWei Liu [P9_TLINK] = v9fs_link, 403960ce86c7SWei Liu [P9_TSYMLINK] = v9fs_symlink, 404060ce86c7SWei Liu [P9_TCREATE] = v9fs_create, 404160ce86c7SWei Liu [P9_TLCREATE] = v9fs_lcreate, 404260ce86c7SWei Liu [P9_TWRITE] = v9fs_write, 404360ce86c7SWei Liu [P9_TWSTAT] = v9fs_wstat, 404460ce86c7SWei Liu [P9_TREMOVE] = v9fs_remove, 404560ce86c7SWei Liu }; 404660ce86c7SWei Liu 40478440e22eSGreg Kurz static void coroutine_fn v9fs_op_not_supp(void *opaque) 404860ce86c7SWei Liu { 404960ce86c7SWei Liu V9fsPDU *pdu = opaque; 405060ce86c7SWei Liu pdu_complete(pdu, -EOPNOTSUPP); 405160ce86c7SWei Liu } 405260ce86c7SWei Liu 40538440e22eSGreg Kurz static void coroutine_fn v9fs_fs_ro(void *opaque) 405460ce86c7SWei Liu { 405560ce86c7SWei Liu V9fsPDU *pdu = opaque; 405660ce86c7SWei Liu pdu_complete(pdu, -EROFS); 405760ce86c7SWei Liu } 405860ce86c7SWei Liu 405960ce86c7SWei Liu static inline bool is_read_only_op(V9fsPDU *pdu) 406060ce86c7SWei Liu { 406160ce86c7SWei Liu switch (pdu->id) { 406260ce86c7SWei Liu case P9_TREADDIR: 406360ce86c7SWei Liu case P9_TSTATFS: 406460ce86c7SWei Liu case P9_TGETATTR: 406560ce86c7SWei Liu case P9_TXATTRWALK: 406660ce86c7SWei Liu case P9_TLOCK: 406760ce86c7SWei Liu case P9_TGETLOCK: 406860ce86c7SWei Liu case P9_TREADLINK: 406960ce86c7SWei Liu case P9_TVERSION: 407060ce86c7SWei Liu case P9_TLOPEN: 407160ce86c7SWei Liu case P9_TATTACH: 407260ce86c7SWei Liu case P9_TSTAT: 407360ce86c7SWei Liu case P9_TWALK: 407460ce86c7SWei Liu case P9_TCLUNK: 407560ce86c7SWei Liu case P9_TFSYNC: 407660ce86c7SWei Liu case P9_TOPEN: 407760ce86c7SWei Liu case P9_TREAD: 407860ce86c7SWei Liu case P9_TAUTH: 407960ce86c7SWei Liu case P9_TFLUSH: 408060ce86c7SWei Liu return 1; 408160ce86c7SWei Liu default: 408260ce86c7SWei Liu return 0; 408360ce86c7SWei Liu } 408460ce86c7SWei Liu } 408560ce86c7SWei Liu 4086506f3275SGreg Kurz void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) 408760ce86c7SWei Liu { 408860ce86c7SWei Liu Coroutine *co; 408960ce86c7SWei Liu CoroutineEntry *handler; 409060ce86c7SWei Liu V9fsState *s = pdu->s; 409160ce86c7SWei Liu 4092506f3275SGreg Kurz pdu->size = le32_to_cpu(hdr->size_le); 4093506f3275SGreg Kurz pdu->id = hdr->id; 4094506f3275SGreg Kurz pdu->tag = le16_to_cpu(hdr->tag_le); 4095506f3275SGreg Kurz 409660ce86c7SWei Liu if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || 409760ce86c7SWei Liu (pdu_co_handlers[pdu->id] == NULL)) { 409860ce86c7SWei Liu handler = v9fs_op_not_supp; 4099d1471233SGreg Kurz } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { 4100d1471233SGreg Kurz handler = v9fs_fs_ro; 410160ce86c7SWei Liu } else { 410260ce86c7SWei Liu handler = pdu_co_handlers[pdu->id]; 410360ce86c7SWei Liu } 410460ce86c7SWei Liu 4105506f3275SGreg Kurz qemu_co_queue_init(&pdu->complete); 41060b8b8753SPaolo Bonzini co = qemu_coroutine_create(handler, pdu); 41070b8b8753SPaolo Bonzini qemu_coroutine_enter(co); 410860ce86c7SWei Liu } 410960ce86c7SWei Liu 41102a0c56aaSWei Liu /* Returns 0 on success, 1 on failure. */ 4111066eb006SGreg Kurz int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, 4112066eb006SGreg Kurz Error **errp) 41132a0c56aaSWei Liu { 411492c45122SVladimir Sementsov-Ogievskiy ERRP_GUARD(); 41152a0c56aaSWei Liu int i, len; 41162a0c56aaSWei Liu struct stat stat; 41172a0c56aaSWei Liu FsDriverEntry *fse; 41182a0c56aaSWei Liu V9fsPath path; 41192a0c56aaSWei Liu int rc = 1; 41202a0c56aaSWei Liu 4121066eb006SGreg Kurz assert(!s->transport); 4122066eb006SGreg Kurz s->transport = t; 4123066eb006SGreg Kurz 41242a0c56aaSWei Liu /* initialize pdu allocator */ 41252a0c56aaSWei Liu QLIST_INIT(&s->free_list); 41262a0c56aaSWei Liu QLIST_INIT(&s->active_list); 41270d78289cSGreg Kurz for (i = 0; i < MAX_REQ; i++) { 4128583f21f8SStefano Stabellini QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 4129583f21f8SStefano Stabellini s->pdus[i].s = s; 4130583f21f8SStefano Stabellini s->pdus[i].idx = i; 41312a0c56aaSWei Liu } 41322a0c56aaSWei Liu 41332a0c56aaSWei Liu v9fs_path_init(&path); 41342a0c56aaSWei Liu 41352a0c56aaSWei Liu fse = get_fsdev_fsentry(s->fsconf.fsdev_id); 41362a0c56aaSWei Liu 41372a0c56aaSWei Liu if (!fse) { 41382a0c56aaSWei Liu /* We don't have a fsdev identified by fsdev_id */ 41392a0c56aaSWei Liu error_setg(errp, "9pfs device couldn't find fsdev with the " 41402a0c56aaSWei Liu "id = %s", 41412a0c56aaSWei Liu s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); 41422a0c56aaSWei Liu goto out; 41432a0c56aaSWei Liu } 41442a0c56aaSWei Liu 41452a0c56aaSWei Liu if (!s->fsconf.tag) { 41462a0c56aaSWei Liu /* we haven't specified a mount_tag */ 41472a0c56aaSWei Liu error_setg(errp, "fsdev with id %s needs mount_tag arguments", 41482a0c56aaSWei Liu s->fsconf.fsdev_id); 41492a0c56aaSWei Liu goto out; 41502a0c56aaSWei Liu } 41512a0c56aaSWei Liu 41522a0c56aaSWei Liu s->ctx.export_flags = fse->export_flags; 41532a0c56aaSWei Liu s->ctx.fs_root = g_strdup(fse->path); 41542a0c56aaSWei Liu s->ctx.exops.get_st_gen = NULL; 41552a0c56aaSWei Liu len = strlen(s->fsconf.tag); 41562a0c56aaSWei Liu if (len > MAX_TAG_LEN - 1) { 41572a0c56aaSWei Liu error_setg(errp, "mount tag '%s' (%d bytes) is longer than " 41582a0c56aaSWei Liu "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); 41592a0c56aaSWei Liu goto out; 41602a0c56aaSWei Liu } 41612a0c56aaSWei Liu 41622a0c56aaSWei Liu s->tag = g_strdup(s->fsconf.tag); 41632a0c56aaSWei Liu s->ctx.uid = -1; 41642a0c56aaSWei Liu 41652a0c56aaSWei Liu s->ops = fse->ops; 41662a0c56aaSWei Liu 4167b96feb2cSTobias Schramm s->ctx.fmode = fse->fmode; 4168b96feb2cSTobias Schramm s->ctx.dmode = fse->dmode; 4169b96feb2cSTobias Schramm 4170feabd6cfSGreg Kurz QSIMPLEQ_INIT(&s->fid_list); 41712a0c56aaSWei Liu qemu_co_rwlock_init(&s->rename_lock); 41722a0c56aaSWei Liu 417365603a80SGreg Kurz if (s->ops->init(&s->ctx, errp) < 0) { 417465603a80SGreg Kurz error_prepend(errp, "cannot initialize fsdev '%s': ", 417565603a80SGreg Kurz s->fsconf.fsdev_id); 41762a0c56aaSWei Liu goto out; 41772a0c56aaSWei Liu } 41782a0c56aaSWei Liu 41792a0c56aaSWei Liu /* 41802a0c56aaSWei Liu * Check details of export path, We need to use fs driver 41812a0c56aaSWei Liu * call back to do that. Since we are in the init path, we don't 41822a0c56aaSWei Liu * use co-routines here. 41832a0c56aaSWei Liu */ 41842a0c56aaSWei Liu if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { 41852a0c56aaSWei Liu error_setg(errp, 41862a0c56aaSWei Liu "error in converting name to path %s", strerror(errno)); 41872a0c56aaSWei Liu goto out; 41882a0c56aaSWei Liu } 41892a0c56aaSWei Liu if (s->ops->lstat(&s->ctx, &path, &stat)) { 41902a0c56aaSWei Liu error_setg(errp, "share path %s does not exist", fse->path); 41912a0c56aaSWei Liu goto out; 41922a0c56aaSWei Liu } else if (!S_ISDIR(stat.st_mode)) { 41932a0c56aaSWei Liu error_setg(errp, "share path %s is not a directory", fse->path); 41942a0c56aaSWei Liu goto out; 41952a0c56aaSWei Liu } 4196b8bbdb88SPradeep Jagadeesh 41973b5ee9e8SAntonios Motakis s->dev_id = stat.st_dev; 41983b5ee9e8SAntonios Motakis 41996b6aa828SChristian Schoenebeck /* init inode remapping : */ 42006b6aa828SChristian Schoenebeck /* hash table for variable length inode suffixes */ 42016b6aa828SChristian Schoenebeck qpd_table_init(&s->qpd_table); 42026b6aa828SChristian Schoenebeck /* hash table for slow/full inode remapping (most users won't need it) */ 42036b6aa828SChristian Schoenebeck qpf_table_init(&s->qpf_table); 42046b6aa828SChristian Schoenebeck /* hash table for quick inode remapping */ 42051a6ed33cSAntonios Motakis qpp_table_init(&s->qpp_table); 42066b6aa828SChristian Schoenebeck s->qp_ndevices = 0; 42076b6aa828SChristian Schoenebeck s->qp_affix_next = 1; /* reserve 0 to detect overflow */ 4208f3fe4a2dSAntonios Motakis s->qp_fullpath_next = 1; 42091a6ed33cSAntonios Motakis 4210b8bbdb88SPradeep Jagadeesh s->ctx.fst = &fse->fst; 4211b8bbdb88SPradeep Jagadeesh fsdev_throttle_init(s->ctx.fst); 4212b8bbdb88SPradeep Jagadeesh 42132a0c56aaSWei Liu rc = 0; 42142a0c56aaSWei Liu out: 42152a0c56aaSWei Liu if (rc) { 4216b69c3c21SMarkus Armbruster v9fs_device_unrealize_common(s); 4217702dbcc2SLi Qiang } 42182a0c56aaSWei Liu v9fs_path_free(&path); 42192a0c56aaSWei Liu return rc; 42202a0c56aaSWei Liu } 42212a0c56aaSWei Liu 4222b69c3c21SMarkus Armbruster void v9fs_device_unrealize_common(V9fsState *s) 42232a0c56aaSWei Liu { 4224c0da0cb7SGreg Kurz if (s->ops && s->ops->cleanup) { 4225702dbcc2SLi Qiang s->ops->cleanup(&s->ctx); 4226702dbcc2SLi Qiang } 4227c0da0cb7SGreg Kurz if (s->ctx.fst) { 4228b8bbdb88SPradeep Jagadeesh fsdev_throttle_cleanup(s->ctx.fst); 4229c0da0cb7SGreg Kurz } 42302a0c56aaSWei Liu g_free(s->tag); 42316b6aa828SChristian Schoenebeck qp_table_destroy(&s->qpd_table); 4232f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpp_table); 4233f3fe4a2dSAntonios Motakis qp_table_destroy(&s->qpf_table); 42344774718eSLi Qiang g_free(s->ctx.fs_root); 42352a0c56aaSWei Liu } 42362a0c56aaSWei Liu 42370e44a0fdSGreg Kurz typedef struct VirtfsCoResetData { 42380e44a0fdSGreg Kurz V9fsPDU pdu; 42390e44a0fdSGreg Kurz bool done; 42400e44a0fdSGreg Kurz } VirtfsCoResetData; 42410e44a0fdSGreg Kurz 42420e44a0fdSGreg Kurz static void coroutine_fn virtfs_co_reset(void *opaque) 42430e44a0fdSGreg Kurz { 42440e44a0fdSGreg Kurz VirtfsCoResetData *data = opaque; 42450e44a0fdSGreg Kurz 42460e44a0fdSGreg Kurz virtfs_reset(&data->pdu); 42470e44a0fdSGreg Kurz data->done = true; 42480e44a0fdSGreg Kurz } 42490e44a0fdSGreg Kurz 42500e44a0fdSGreg Kurz void v9fs_reset(V9fsState *s) 42510e44a0fdSGreg Kurz { 42520e44a0fdSGreg Kurz VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; 42530e44a0fdSGreg Kurz Coroutine *co; 42540e44a0fdSGreg Kurz 42550e44a0fdSGreg Kurz while (!QLIST_EMPTY(&s->active_list)) { 42560e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42570e44a0fdSGreg Kurz } 42580e44a0fdSGreg Kurz 42590e44a0fdSGreg Kurz co = qemu_coroutine_create(virtfs_co_reset, &data); 42600e44a0fdSGreg Kurz qemu_coroutine_enter(co); 42610e44a0fdSGreg Kurz 42620e44a0fdSGreg Kurz while (!data.done) { 42630e44a0fdSGreg Kurz aio_poll(qemu_get_aio_context(), true); 42640e44a0fdSGreg Kurz } 42650e44a0fdSGreg Kurz } 42660e44a0fdSGreg Kurz 426760ce86c7SWei Liu static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) 426860ce86c7SWei Liu { 426960ce86c7SWei Liu struct rlimit rlim; 427060ce86c7SWei Liu if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { 427163325b18SGreg Kurz error_report("Failed to get the resource limit"); 427260ce86c7SWei Liu exit(1); 427360ce86c7SWei Liu } 427460ce86c7SWei Liu open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur / 3); 427560ce86c7SWei Liu open_fd_rc = rlim.rlim_cur / 2; 427660ce86c7SWei Liu } 4277