| /* |
| * Virtio 9p backend |
| * |
| * Copyright IBM, Corp. 2010 |
| * |
| * Authors: |
| * Anthony Liguori <aliguori@us.ibm.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include <glib/gprintf.h> |
| #include "hw/virtio/virtio.h" |
| #include "qapi/error.h" |
| #include "qemu/error-report.h" |
| #include "qemu/iov.h" |
| #include "qemu/main-loop.h" |
| #include "qemu/sockets.h" |
| #include "virtio-9p.h" |
| #include "fsdev/qemu-fsdev.h" |
| #include "9p-xattr.h" |
| #include "coth.h" |
| #include "trace.h" |
| #include "migration/blocker.h" |
| #include "sysemu/qtest.h" |
| #include "qemu/xxhash.h" |
| #include <math.h> |
| #include <linux/limits.h> |
| |
| int open_fd_hw; |
| int total_open_fd; |
| static int open_fd_rc; |
| |
| enum { |
| Oread = 0x00, |
| Owrite = 0x01, |
| Ordwr = 0x02, |
| Oexec = 0x03, |
| Oexcl = 0x04, |
| Otrunc = 0x10, |
| Orexec = 0x20, |
| Orclose = 0x40, |
| Oappend = 0x80, |
| }; |
| |
| static ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
| { |
| ssize_t ret; |
| va_list ap; |
| |
| va_start(ap, fmt); |
| ret = pdu->s->transport->pdu_vmarshal(pdu, offset, fmt, ap); |
| va_end(ap); |
| |
| return ret; |
| } |
| |
| static ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
| { |
| ssize_t ret; |
| va_list ap; |
| |
| va_start(ap, fmt); |
| ret = pdu->s->transport->pdu_vunmarshal(pdu, offset, fmt, ap); |
| va_end(ap); |
| |
| return ret; |
| } |
| |
| static int omode_to_uflags(int8_t mode) |
| { |
| int ret = 0; |
| |
| switch (mode & 3) { |
| case Oread: |
| ret = O_RDONLY; |
| break; |
| case Ordwr: |
| ret = O_RDWR; |
| break; |
| case Owrite: |
| ret = O_WRONLY; |
| break; |
| case Oexec: |
| ret = O_RDONLY; |
| break; |
| } |
| |
| if (mode & Otrunc) { |
| ret |= O_TRUNC; |
| } |
| |
| if (mode & Oappend) { |
| ret |= O_APPEND; |
| } |
| |
| if (mode & Oexcl) { |
| ret |= O_EXCL; |
| } |
| |
| return ret; |
| } |
| |
| typedef struct DotlOpenflagMap { |
| int dotl_flag; |
| int open_flag; |
| } DotlOpenflagMap; |
| |
| static int dotl_to_open_flags(int flags) |
| { |
| int i; |
| /* |
| * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY |
| * and P9_DOTL_NOACCESS |
| */ |
| int oflags = flags & O_ACCMODE; |
| |
| DotlOpenflagMap dotl_oflag_map[] = { |
| { P9_DOTL_CREATE, O_CREAT }, |
| { P9_DOTL_EXCL, O_EXCL }, |
| { P9_DOTL_NOCTTY , O_NOCTTY }, |
| { P9_DOTL_TRUNC, O_TRUNC }, |
| { P9_DOTL_APPEND, O_APPEND }, |
| { P9_DOTL_NONBLOCK, O_NONBLOCK } , |
| { P9_DOTL_DSYNC, O_DSYNC }, |
| { P9_DOTL_FASYNC, FASYNC }, |
| { P9_DOTL_DIRECT, O_DIRECT }, |
| { P9_DOTL_LARGEFILE, O_LARGEFILE }, |
| { P9_DOTL_DIRECTORY, O_DIRECTORY }, |
| { P9_DOTL_NOFOLLOW, O_NOFOLLOW }, |
| { P9_DOTL_NOATIME, O_NOATIME }, |
| { P9_DOTL_SYNC, O_SYNC }, |
| }; |
| |
| for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { |
| if (flags & dotl_oflag_map[i].dotl_flag) { |
| oflags |= dotl_oflag_map[i].open_flag; |
| } |
| } |
| |
| return oflags; |
| } |
| |
| void cred_init(FsCred *credp) |
| { |
| credp->fc_uid = -1; |
| credp->fc_gid = -1; |
| credp->fc_mode = -1; |
| credp->fc_rdev = -1; |
| } |
| |
| static int get_dotl_openflags(V9fsState *s, int oflags) |
| { |
| int flags; |
| /* |
| * Filter the client open flags |
| */ |
| flags = dotl_to_open_flags(oflags); |
| flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT); |
| /* |
| * Ignore direct disk access hint until the server supports it. |
| */ |
| flags &= ~O_DIRECT; |
| return flags; |
| } |
| |
| void v9fs_path_init(V9fsPath *path) |
| { |
| path->data = NULL; |
| path->size = 0; |
| } |
| |
| void v9fs_path_free(V9fsPath *path) |
| { |
| g_free(path->data); |
| path->data = NULL; |
| path->size = 0; |
| } |
| |
| |
| void GCC_FMT_ATTR(2, 3) |
| v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...) |
| { |
| va_list ap; |
| |
| v9fs_path_free(path); |
| |
| va_start(ap, fmt); |
| /* Bump the size for including terminating NULL */ |
| path->size = g_vasprintf(&path->data, fmt, ap) + 1; |
| va_end(ap); |
| } |
| |
| void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src) |
| { |
| v9fs_path_free(dst); |
| dst->size = src->size; |
| dst->data = g_memdup(src->data, src->size); |
| } |
| |
| int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, |
| const char *name, V9fsPath *path) |
| { |
| int err; |
| err = s->ops->name_to_path(&s->ctx, dirpath, name, path); |
| if (err < 0) { |
| err = -errno; |
| } |
| return err; |
| } |
| |
| /* |
| * Return TRUE if s1 is an ancestor of s2. |
| * |
| * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". |
| * As a special case, We treat s1 as ancestor of s2 if they are same! |
| */ |
| static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2) |
| { |
| if (!strncmp(s1->data, s2->data, s1->size - 1)) { |
| if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') { |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| static size_t v9fs_string_size(V9fsString *str) |
| { |
| return str->size; |
| } |
| |
| /* |
| * returns 0 if fid got re-opened, 1 if not, < 0 on error */ |
| static int coroutine_fn v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f) |
| { |
| int err = 1; |
| if (f->fid_type == P9_FID_FILE) { |
| if (f->fs.fd == -1) { |
| do { |
| err = v9fs_co_open(pdu, f, f->open_flags); |
| } while (err == -EINTR && !pdu->cancelled); |
| } |
| } else if (f->fid_type == P9_FID_DIR) { |
| if (f->fs.dir.stream == NULL) { |
| do { |
| err = v9fs_co_opendir(pdu, f); |
| } while (err == -EINTR && !pdu->cancelled); |
| } |
| } |
| return err; |
| } |
| |
| static V9fsFidState *coroutine_fn get_fid(V9fsPDU *pdu, int32_t fid) |
| { |
| int err; |
| V9fsFidState *f; |
| V9fsState *s = pdu->s; |
| |
| for (f = s->fid_list; f; f = f->next) { |
| BUG_ON(f->clunked); |
| if (f->fid == fid) { |
| /* |
| * Update the fid ref upfront so that |
| * we don't get reclaimed when we yield |
| * in open later. |
| */ |
| f->ref++; |
| /* |
| * check whether we need to reopen the |
| * file. We might have closed the fd |
| * while trying to free up some file |
| * descriptors. |
| */ |
| err = v9fs_reopen_fid(pdu, f); |
| if (err < 0) { |
| f->ref--; |
| return NULL; |
| } |
| /* |
| * Mark the fid as referenced so that the LRU |
| * reclaim won't close the file descriptor |
| */ |
| f->flags |= FID_REFERENCED; |
| return f; |
| } |
| } |
| return NULL; |
| } |
| |
| static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) |
| { |
| V9fsFidState *f; |
| |
| for (f = s->fid_list; f; f = f->next) { |
| /* If fid is already there return NULL */ |
| BUG_ON(f->clunked); |
| if (f->fid == fid) { |
| return NULL; |
| } |
| } |
| f = g_malloc0(sizeof(V9fsFidState)); |
| f->fid = fid; |
| f->fid_type = P9_FID_NONE; |
| f->ref = 1; |
| /* |
| * Mark the fid as referenced so that the LRU |
| * reclaim won't close the file descriptor |
| */ |
| f->flags |= FID_REFERENCED; |
| f->next = s->fid_list; |
| s->fid_list = f; |
| |
| v9fs_readdir_init(s->proto_version, &f->fs.dir); |
| v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir); |
| |
| return f; |
| } |
| |
| static int coroutine_fn v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp) |
| { |
| int retval = 0; |
| |
| if (fidp->fs.xattr.xattrwalk_fid) { |
| /* getxattr/listxattr fid */ |
| goto free_value; |
| } |
| /* |
| * if this is fid for setxattr. clunk should |
| * result in setxattr localcall |
| */ |
| if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) { |
| /* clunk after partial write */ |
| retval = -EINVAL; |
| goto free_out; |
| } |
| if (fidp->fs.xattr.len) { |
| retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name, |
| fidp->fs.xattr.value, |
| fidp->fs.xattr.len, |
| fidp->fs.xattr.flags); |
| } else { |
| retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name); |
| } |
| free_out: |
| v9fs_string_free(&fidp->fs.xattr.name); |
| free_value: |
| g_free(fidp->fs.xattr.value); |
| return retval; |
| } |
| |
| static int coroutine_fn free_fid(V9fsPDU *pdu, V9fsFidState *fidp) |
| { |
| int retval = 0; |
| |
| if (fidp->fid_type == P9_FID_FILE) { |
| /* If we reclaimed the fd no need to close */ |
| if (fidp->fs.fd != -1) { |
| retval = v9fs_co_close(pdu, &fidp->fs); |
| } |
| } else if (fidp->fid_type == P9_FID_DIR) { |
| if (fidp->fs.dir.stream != NULL) { |
| retval = v9fs_co_closedir(pdu, &fidp->fs); |
| } |
| } else if (fidp->fid_type == P9_FID_XATTR) { |
| retval = v9fs_xattr_fid_clunk(pdu, fidp); |
| } |
| v9fs_path_free(&fidp->path); |
| g_free(fidp); |
| return retval; |
| } |
| |
| static int coroutine_fn put_fid(V9fsPDU *pdu, V9fsFidState *fidp) |
| { |
| BUG_ON(!fidp->ref); |
| fidp->ref--; |
| /* |
| * Don't free the fid if it is in reclaim list |
| */ |
| if (!fidp->ref && fidp->clunked) { |
| if (fidp->fid == pdu->s->root_fid) { |
| /* |
| * if the clunked fid is root fid then we |
| * have unmounted the fs on the client side. |
| * delete the migration blocker. Ideally, this |
| * should be hooked to transport close notification |
| */ |
| if (pdu->s->migration_blocker) { |
| migrate_del_blocker(pdu->s->migration_blocker); |
| error_free(pdu->s->migration_blocker); |
| pdu->s->migration_blocker = NULL; |
| } |
| } |
| return free_fid(pdu, fidp); |
| } |
| return 0; |
| } |
| |
| static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid) |
| { |
| V9fsFidState **fidpp, *fidp; |
| |
| for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { |
| if ((*fidpp)->fid == fid) { |
| break; |
| } |
| } |
| if (*fidpp == NULL) { |
| return NULL; |
| } |
| fidp = *fidpp; |
| *fidpp = fidp->next; |
| fidp->clunked = 1; |
| return fidp; |
| } |
| |
| void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu) |
| { |
| int reclaim_count = 0; |
| V9fsState *s = pdu->s; |
| V9fsFidState *f, *reclaim_list = NULL; |
| |
| for (f = s->fid_list; f; f = f->next) { |
| /* |
| * Unlink fids cannot be reclaimed. Check |
| * for them and skip them. Also skip fids |
| * currently being operated on. |
| */ |
| if (f->ref || f->flags & FID_NON_RECLAIMABLE) { |
| continue; |
| } |
| /* |
| * if it is a recently referenced fid |
| * we leave the fid untouched and clear the |
| * reference bit. We come back to it later |
| * in the next iteration. (a simple LRU without |
| * moving list elements around) |
| */ |
| if (f->flags & FID_REFERENCED) { |
| f->flags &= ~FID_REFERENCED; |
| continue; |
| } |
| /* |
| * Add fids to reclaim list. |
| */ |
| if (f->fid_type == P9_FID_FILE) { |
| if (f->fs.fd != -1) { |
| /* |
| * Up the reference count so that |
| * a clunk request won't free this fid |
| */ |
| f->ref++; |
| f->rclm_lst = reclaim_list; |
| reclaim_list = f; |
| f->fs_reclaim.fd = f->fs.fd; |
| f->fs.fd = -1; |
| reclaim_count++; |
| } |
| } else if (f->fid_type == P9_FID_DIR) { |
| if (f->fs.dir.stream != NULL) { |
| /* |
| * Up the reference count so that |
| * a clunk request won't free this fid |
| */ |
| f->ref++; |
| f->rclm_lst = reclaim_list; |
| reclaim_list = f; |
| f->fs_reclaim.dir.stream = f->fs.dir.stream; |
| f->fs.dir.stream = NULL; |
| reclaim_count++; |
| } |
| } |
| if (reclaim_count >= open_fd_rc) { |
| break; |
| } |
| } |
| /* |
| * Now close the fid in reclaim list. Free them if they |
| * are already clunked. |
| */ |
| while (reclaim_list) { |
| f = reclaim_list; |
| reclaim_list = f->rclm_lst; |
| if (f->fid_type == P9_FID_FILE) { |
| v9fs_co_close(pdu, &f->fs_reclaim); |
| } else if (f->fid_type == P9_FID_DIR) { |
| v9fs_co_closedir(pdu, &f->fs_reclaim); |
| } |
| f->rclm_lst = NULL; |
| /* |
| * Now drop the fid reference, free it |
| * if clunked. |
| */ |
| put_fid(pdu, f); |
| } |
| } |
| |
| static int coroutine_fn v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path) |
| { |
| int err; |
| V9fsState *s = pdu->s; |
| V9fsFidState *fidp, head_fid; |
| |
| head_fid.next = s->fid_list; |
| for (fidp = s->fid_list; fidp; fidp = fidp->next) { |
| if (fidp->path.size != path->size) { |
| continue; |
| } |
| if (!memcmp(fidp->path.data, path->data, path->size)) { |
| /* Mark the fid non reclaimable. */ |
| fidp->flags |= FID_NON_RECLAIMABLE; |
| |
| /* reopen the file/dir if already closed */ |
| err = v9fs_reopen_fid(pdu, fidp); |
| if (err < 0) { |
| return err; |
| } |
| /* |
| * Go back to head of fid list because |
| * the list could have got updated when |
| * switched to the worker thread |
| */ |
| if (err == 0) { |
| fidp = &head_fid; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static void coroutine_fn virtfs_reset(V9fsPDU *pdu) |
| { |
| V9fsState *s = pdu->s; |
| V9fsFidState *fidp; |
| |
| /* Free all fids */ |
| while (s->fid_list) { |
| /* Get fid */ |
| fidp = s->fid_list; |
| fidp->ref++; |
| |
| /* Clunk fid */ |
| s->fid_list = fidp->next; |
| fidp->clunked = 1; |
| |
| put_fid(pdu, fidp); |
| } |
| } |
| |
| #define P9_QID_TYPE_DIR 0x80 |
| #define P9_QID_TYPE_SYMLINK 0x02 |
| |
| #define P9_STAT_MODE_DIR 0x80000000 |
| #define P9_STAT_MODE_APPEND 0x40000000 |
| #define P9_STAT_MODE_EXCL 0x20000000 |
| #define P9_STAT_MODE_MOUNT 0x10000000 |
| #define P9_STAT_MODE_AUTH 0x08000000 |
| #define P9_STAT_MODE_TMP 0x04000000 |
| #define P9_STAT_MODE_SYMLINK 0x02000000 |
| #define P9_STAT_MODE_LINK 0x01000000 |
| #define P9_STAT_MODE_DEVICE 0x00800000 |
| #define P9_STAT_MODE_NAMED_PIPE 0x00200000 |
| #define P9_STAT_MODE_SOCKET 0x00100000 |
| #define P9_STAT_MODE_SETUID 0x00080000 |
| #define P9_STAT_MODE_SETGID 0x00040000 |
| #define P9_STAT_MODE_SETVTX 0x00010000 |
| |
| #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ |
| P9_STAT_MODE_SYMLINK | \ |
| P9_STAT_MODE_LINK | \ |
| P9_STAT_MODE_DEVICE | \ |
| P9_STAT_MODE_NAMED_PIPE | \ |
| P9_STAT_MODE_SOCKET) |
| |
| /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */ |
| static inline uint8_t mirror8bit(uint8_t byte) |
| { |
| return (byte * 0x0202020202ULL & 0x010884422010ULL) % 1023; |
| } |
| |
| /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */ |
| static inline uint64_t mirror64bit(uint64_t value) |
| { |
| return ((uint64_t)mirror8bit(value & 0xff) << 56) | |
| ((uint64_t)mirror8bit((value >> 8) & 0xff) << 48) | |
| ((uint64_t)mirror8bit((value >> 16) & 0xff) << 40) | |
| ((uint64_t)mirror8bit((value >> 24) & 0xff) << 32) | |
| ((uint64_t)mirror8bit((value >> 32) & 0xff) << 24) | |
| ((uint64_t)mirror8bit((value >> 40) & 0xff) << 16) | |
| ((uint64_t)mirror8bit((value >> 48) & 0xff) << 8) | |
| ((uint64_t)mirror8bit((value >> 56) & 0xff)); |
| } |
| |
| /** |
| * @brief Parameter k for the Exponential Golomb algorihm to be used. |
| * |
| * The smaller this value, the smaller the minimum bit count for the Exp. |
| * Golomb generated affixes will be (at lowest index) however for the |
| * price of having higher maximum bit count of generated affixes (at highest |
| * index). Likewise increasing this parameter yields in smaller maximum bit |
| * count for the price of having higher minimum bit count. |
| * |
| * In practice that means: a good value for k depends on the expected amount |
| * of devices to be exposed by one export. For a small amount of devices k |
| * should be small, for a large amount of devices k might be increased |
| * instead. The default of k=0 should be fine for most users though. |
| * |
| * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of |
| * k should not change as long as guest is still running! Because that would |
| * cause completely different inode numbers to be generated on guest. |
| */ |
| #define EXP_GOLOMB_K 0 |
| |
| /** |
| * @brief Exponential Golomb algorithm for arbitrary k (including k=0). |
| * |
| * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!) |
| * with growing length and with the mathematical property of being |
| * "prefix-free". The latter means the generated prefixes can be prepended |
| * in front of arbitrary numbers and the resulting concatenated numbers are |
| * guaranteed to be always unique. |
| * |
| * This is a minor adjustment to the original Exp. Golomb algorithm in the |
| * sense that lowest allowed index (@param n) starts with 1, not with zero. |
| * |
| * @param n - natural number (or index) of the prefix to be generated |
| * (1, 2, 3, ...) |
| * @param k - parameter k of Exp. Golomb algorithm to be used |
| * (see comment on EXP_GOLOMB_K macro for details about k) |
| */ |
| static VariLenAffix expGolombEncode(uint64_t n, int k) |
| { |
| const uint64_t value = n + (1 << k) - 1; |
| const int bits = (int) log2(value) + 1; |
| return (VariLenAffix) { |
| .type = AffixType_Prefix, |
| .value = value, |
| .bits = bits + MAX((bits - 1 - k), 0) |
| }; |
| } |
| |
| /** |
| * @brief Converts a suffix into a prefix, or a prefix into a suffix. |
| * |
| * Simply mirror all bits of the affix value, for the purpose to preserve |
| * respectively the mathematical "prefix-free" or "suffix-free" property |
| * after the conversion. |
| * |
| * If a passed prefix is suitable to create unique numbers, then the |
| * returned suffix is suitable to create unique numbers as well (and vice |
| * versa). |
| */ |
| static VariLenAffix invertAffix(const VariLenAffix *affix) |
| { |
| return (VariLenAffix) { |
| .type = |
| (affix->type == AffixType_Suffix) ? |
| AffixType_Prefix : AffixType_Suffix, |
| .value = |
| mirror64bit(affix->value) >> |
| ((sizeof(affix->value) * 8) - affix->bits), |
| .bits = affix->bits |
| }; |
| } |
| |
| /** |
| * @brief Generates suffix numbers with "suffix-free" property. |
| * |
| * This is just a wrapper function on top of the Exp. Golomb algorithm. |
| * |
| * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes, |
| * this function converts the Exp. Golomb prefixes into appropriate suffixes |
| * which are still suitable for generating unique numbers. |
| * |
| * @param n - natural number (or index) of the suffix to be generated |
| * (1, 2, 3, ...) |
| */ |
| static VariLenAffix affixForIndex(uint64_t index) |
| { |
| VariLenAffix prefix; |
| prefix = expGolombEncode(index, EXP_GOLOMB_K); |
| return invertAffix(&prefix); /* convert prefix to suffix */ |
| } |
| |
| /* creative abuse of tb_hash_func7, which is based on xxhash */ |
| static uint32_t qpp_hash(QppEntry e) |
| { |
| return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0); |
| } |
| |
| static uint32_t qpf_hash(QpfEntry e) |
| { |
| return qemu_xxhash7(e.ino, e.dev, 0, 0, 0); |
| } |
| |
| static bool qpd_cmp_func(const void *obj, const void *userp) |
| { |
| const QpdEntry *e1 = obj, *e2 = userp; |
| return e1->dev == e2->dev; |
| } |
| |
| static bool qpp_cmp_func(const void *obj, const void *userp) |
| { |
| const QppEntry *e1 = obj, *e2 = userp; |
| return e1->dev == e2->dev && e1->ino_prefix == e2->ino_prefix; |
| } |
| |
| static bool qpf_cmp_func(const void *obj, const void *userp) |
| { |
| const QpfEntry *e1 = obj, *e2 = userp; |
| return e1->dev == e2->dev && e1->ino == e2->ino; |
| } |
| |
| static void qp_table_remove(void *p, uint32_t h, void *up) |
| { |
| g_free(p); |
| } |
| |
| static void qp_table_destroy(struct qht *ht) |
| { |
| if (!ht || !ht->map) { |
| return; |
| } |
| qht_iter(ht, qp_table_remove, NULL); |
| qht_destroy(ht); |
| } |
| |
| static void qpd_table_init(struct qht *ht) |
| { |
| qht_init(ht, qpd_cmp_func, 1, QHT_MODE_AUTO_RESIZE); |
| } |
| |
| static void qpp_table_init(struct qht *ht) |
| { |
| qht_init(ht, qpp_cmp_func, 1, QHT_MODE_AUTO_RESIZE); |
| } |
| |
| static void qpf_table_init(struct qht *ht) |
| { |
| qht_init(ht, qpf_cmp_func, 1 << 16, QHT_MODE_AUTO_RESIZE); |
| } |
| |
| /* |
| * Returns how many (high end) bits of inode numbers of the passed fs |
| * device shall be used (in combination with the device number) to |
| * generate hash values for qpp_table entries. |
| * |
| * This function is required if variable length suffixes are used for inode |
| * number mapping on guest level. Since a device may end up having multiple |
| * entries in qpp_table, each entry most probably with a different suffix |
| * length, we thus need this function in conjunction with qpd_table to |
| * "agree" about a fix amount of bits (per device) to be always used for |
| * generating hash values for the purpose of accessing qpp_table in order |
| * get consistent behaviour when accessing qpp_table. |
| */ |
| static int qid_inode_prefix_hash_bits(V9fsPDU *pdu, dev_t dev) |
| { |
| QpdEntry lookup = { |
| .dev = dev |
| }, *val; |
| uint32_t hash = dev; |
| VariLenAffix affix; |
| |
| val = qht_lookup(&pdu->s->qpd_table, &lookup, hash); |
| if (!val) { |
| val = g_malloc0(sizeof(QpdEntry)); |
| *val = lookup; |
| affix = affixForIndex(pdu->s->qp_affix_next); |
| val->prefix_bits = affix.bits; |
| qht_insert(&pdu->s->qpd_table, val, hash, NULL); |
| pdu->s->qp_ndevices++; |
| } |
| return val->prefix_bits; |
| } |
| |
| /** |
| * @brief Slow / full mapping host inode nr -> guest inode nr. |
| * |
| * This function performs a slower and much more costly remapping of an |
| * original file inode number on host to an appropriate different inode |
| * number on guest. For every (dev, inode) combination on host a new |
| * sequential number is generated, cached and exposed as inode number on |
| * guest. |
| * |
| * This is just a "last resort" fallback solution if the much faster/cheaper |
| * qid_path_suffixmap() failed. In practice this slow / full mapping is not |
| * expected ever to be used at all though. |
| * |
| * @see qid_path_suffixmap() for details |
| * |
| */ |
| static int qid_path_fullmap(V9fsPDU *pdu, const struct stat *stbuf, |
| uint64_t *path) |
| { |
| QpfEntry lookup = { |
| .dev = stbuf->st_dev, |
| .ino = stbuf->st_ino |
| }, *val; |
| uint32_t hash = qpf_hash(lookup); |
| VariLenAffix affix; |
| |
| val = qht_lookup(&pdu->s->qpf_table, &lookup, hash); |
| |
| if (!val) { |
| if (pdu->s->qp_fullpath_next == 0) { |
| /* no more files can be mapped :'( */ |
| error_report_once( |
| "9p: No more prefixes available for remapping inodes from " |
| "host to guest." |
| ); |
| return -ENFILE; |
| } |
| |
| val = g_malloc0(sizeof(QppEntry)); |
| *val = lookup; |
| |
| /* new unique inode and device combo */ |
| affix = affixForIndex( |
| 1ULL << (sizeof(pdu->s->qp_affix_next) * 8) |
| ); |
| val->path = (pdu->s->qp_fullpath_next++ << affix.bits) | affix.value; |
| pdu->s->qp_fullpath_next &= ((1ULL << (64 - affix.bits)) - 1); |
| qht_insert(&pdu->s->qpf_table, val, hash, NULL); |
| } |
| |
| *path = val->path; |
| return 0; |
| } |
| |
| /** |
| * @brief Quick mapping host inode nr -> guest inode nr. |
| * |
| * This function performs quick remapping of an original file inode number |
| * on host to an appropriate different inode number on guest. This remapping |
| * of inodes is required to avoid inode nr collisions on guest which would |
| * happen if the 9p export contains more than 1 exported file system (or |
| * more than 1 file system data set), because unlike on host level where the |
| * files would have different device nrs, all files exported by 9p would |
| * share the same device nr on guest (the device nr of the virtual 9p device |
| * that is). |
| * |
| * Inode remapping is performed by chopping off high end bits of the original |
| * inode number from host, shifting the result upwards and then assigning a |
| * generated suffix number for the low end bits, where the same suffix number |
| * will be shared by all inodes with the same device id AND the same high end |
| * bits that have been chopped off. That approach utilizes the fact that inode |
| * numbers very likely share the same high end bits (i.e. due to their common |
| * sequential generation by file systems) and hence we only have to generate |
| * and track a very limited amount of suffixes in practice due to that. |
| * |
| * We generate variable size suffixes for that purpose. The 1st generated |
| * suffix will only have 1 bit and hence we only need to chop off 1 bit from |
| * the original inode number. The subsequent suffixes being generated will |
| * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being |
| * generated will have 3 bits and hence we have to chop off 3 bits from their |
| * original inodes, and so on. That approach of using variable length suffixes |
| * (i.e. over fixed size ones) utilizes the fact that in practice only a very |
| * limited amount of devices are shared by the same export (e.g. typically |
| * less than 2 dozen devices per 9p export), so in practice we need to chop |
| * off less bits than with fixed size prefixes and yet are flexible to add |
| * new devices at runtime below host's export directory at any time without |
| * having to reboot guest nor requiring to reconfigure guest for that. And due |
| * to the very limited amount of original high end bits that we chop off that |
| * way, the total amount of suffixes we need to generate is less than by using |
| * fixed size prefixes and hence it also improves performance of the inode |
| * remapping algorithm, and finally has the nice side effect that the inode |
| * numbers on guest will be much smaller & human friendly. ;-) |
| */ |
| static int qid_path_suffixmap(V9fsPDU *pdu, const struct stat *stbuf, |
| uint64_t *path) |
| { |
| const int ino_hash_bits = qid_inode_prefix_hash_bits(pdu, stbuf->st_dev); |
| QppEntry lookup = { |
| .dev = stbuf->st_dev, |
| .ino_prefix = (uint16_t) (stbuf->st_ino >> (64 - ino_hash_bits)) |
| }, *val; |
| uint32_t hash = qpp_hash(lookup); |
| |
| val = qht_lookup(&pdu->s->qpp_table, &lookup, hash); |
| |
| if (!val) { |
| if (pdu->s->qp_affix_next == 0) { |
| /* we ran out of affixes */ |
| warn_report_once( |
| "9p: Potential degraded performance of inode remapping" |
| ); |
| return -ENFILE; |
| } |
| |
| val = g_malloc0(sizeof(QppEntry)); |
| *val = lookup; |
| |
| /* new unique inode affix and device combo */ |
| val->qp_affix_index = pdu->s->qp_affix_next++; |
| val->qp_affix = affixForIndex(val->qp_affix_index); |
| qht_insert(&pdu->s->qpp_table, val, hash, NULL); |
| } |
| /* assuming generated affix to be suffix type, not prefix */ |
| *path = (stbuf->st_ino << val->qp_affix.bits) | val->qp_affix.value; |
| return 0; |
| } |
| |
| static int stat_to_qid(V9fsPDU *pdu, const struct stat *stbuf, V9fsQID *qidp) |
| { |
| int err; |
| size_t size; |
| |
| if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { |
| /* map inode+device to qid path (fast path) */ |
| err = qid_path_suffixmap(pdu, stbuf, &qidp->path); |
| if (err == -ENFILE) { |
| /* fast path didn't work, fall back to full map */ |
| err = qid_path_fullmap(pdu, stbuf, &qidp->path); |
| } |
| if (err) { |
| return err; |
| } |
| } else { |
| if (pdu->s->dev_id != stbuf->st_dev) { |
| if (pdu->s->ctx.export_flags & V9FS_FORBID_MULTIDEVS) { |
| error_report_once( |
| "9p: Multiple devices detected in same VirtFS export. " |
| "Access of guest to additional devices is (partly) " |
| "denied due to virtfs option 'multidevs=forbid' being " |
| "effective." |
| ); |
| return -ENODEV; |
| } else { |
| warn_report_once( |
| "9p: Multiple devices detected in same VirtFS export, " |
| "which might lead to file ID collisions and severe " |
| "misbehaviours on guest! You should either use a " |
| "separate export for each device shared from host or " |
| "use virtfs option 'multidevs=remap'!" |
| ); |
| } |
| } |
| memset(&qidp->path, 0, sizeof(qidp->path)); |
| size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); |
| memcpy(&qidp->path, &stbuf->st_ino, size); |
| } |
| |
| qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); |
| qidp->type = 0; |
| if (S_ISDIR(stbuf->st_mode)) { |
| qidp->type |= P9_QID_TYPE_DIR; |
| } |
| if (S_ISLNK(stbuf->st_mode)) { |
| qidp->type |= P9_QID_TYPE_SYMLINK; |
| } |
| |
| return 0; |
| } |
| |
| static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, |
| V9fsQID *qidp) |
| { |
| struct stat stbuf; |
| int err; |
| |
| err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| if (err < 0) { |
| return err; |
| } |
| err = stat_to_qid(pdu, &stbuf, qidp); |
| if (err < 0) { |
| return err; |
| } |
| return 0; |
| } |
| |
| V9fsPDU *pdu_alloc(V9fsState *s) |
| { |
| V9fsPDU *pdu = NULL; |
| |
| if (!QLIST_EMPTY(&s->free_list)) { |
| pdu = QLIST_FIRST(&s->free_list); |
| QLIST_REMOVE(pdu, next); |
| QLIST_INSERT_HEAD(&s->active_list, pdu, next); |
| } |
| return pdu; |
| } |
| |
| void pdu_free(V9fsPDU *pdu) |
| { |
| V9fsState *s = pdu->s; |
| |
| g_assert(!pdu->cancelled); |
| QLIST_REMOVE(pdu, next); |
| QLIST_INSERT_HEAD(&s->free_list, pdu, next); |
| } |
| |
| static void coroutine_fn pdu_complete(V9fsPDU *pdu, ssize_t len) |
| { |
| int8_t id = pdu->id + 1; /* Response */ |
| V9fsState *s = pdu->s; |
| int ret; |
| |
| /* |
| * The 9p spec requires that successfully cancelled pdus receive no reply. |
| * Sending a reply would confuse clients because they would |
| * assume that any EINTR is the actual result of the operation, |
| * rather than a consequence of the cancellation. However, if |
| * the operation completed (succesfully or with an error other |
| * than caused be cancellation), we do send out that reply, both |
| * for efficiency and to avoid confusing the rest of the state machine |
| * that assumes passing a non-error here will mean a successful |
| * transmission of the reply. |
| */ |
| bool discard = pdu->cancelled && len == -EINTR; |
| if (discard) { |
| trace_v9fs_rcancel(pdu->tag, pdu->id); |
| pdu->size = 0; |
| goto out_notify; |
| } |
| |
| if (len < 0) { |
| int err = -len; |
| len = 7; |
| |
| if (s->proto_version != V9FS_PROTO_2000L) { |
| V9fsString str; |
| |
| str.data = strerror(err); |
| str.size = strlen(str.data); |
| |
| ret = pdu_marshal(pdu, len, "s", &str); |
| if (ret < 0) { |
| goto out_notify; |
| } |
| len += ret; |
| id = P9_RERROR; |
| } |
| |
| ret = pdu_marshal(pdu, len, "d", err); |
| if (ret < 0) { |
| goto out_notify; |
| } |
| len += ret; |
| |
| if (s->proto_version == V9FS_PROTO_2000L) { |
| id = P9_RLERROR; |
| } |
| trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */ |
| } |
| |
| /* fill out the header */ |
| if (pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag) < 0) { |
| goto out_notify; |
| } |
| |
| /* keep these in sync */ |
| pdu->size = len; |
| pdu->id = id; |
| |
| out_notify: |
| pdu->s->transport->push_and_notify(pdu); |
| |
| /* Now wakeup anybody waiting in flush for this request */ |
| if (!qemu_co_queue_next(&pdu->complete)) { |
| pdu_free(pdu); |
| } |
| } |
| |
| static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) |
| { |
| mode_t ret; |
| |
| ret = mode & 0777; |
| if (mode & P9_STAT_MODE_DIR) { |
| ret |= S_IFDIR; |
| } |
| |
| if (mode & P9_STAT_MODE_SYMLINK) { |
| ret |= S_IFLNK; |
| } |
| if (mode & P9_STAT_MODE_SOCKET) { |
| ret |= S_IFSOCK; |
| } |
| if (mode & P9_STAT_MODE_NAMED_PIPE) { |
| ret |= S_IFIFO; |
| } |
| if (mode & P9_STAT_MODE_DEVICE) { |
| if (extension->size && extension->data[0] == 'c') { |
| ret |= S_IFCHR; |
| } else { |
| ret |= S_IFBLK; |
| } |
| } |
| |
| if (!(ret&~0777)) { |
| ret |= S_IFREG; |
| } |
| |
| if (mode & P9_STAT_MODE_SETUID) { |
| ret |= S_ISUID; |
| } |
| if (mode & P9_STAT_MODE_SETGID) { |
| ret |= S_ISGID; |
| } |
| if (mode & P9_STAT_MODE_SETVTX) { |
| ret |= S_ISVTX; |
| } |
| |
| return ret; |
| } |
| |
| static int donttouch_stat(V9fsStat *stat) |
| { |
| if (stat->type == -1 && |
| stat->dev == -1 && |
| stat->qid.type == 0xff && |
| stat->qid.version == (uint32_t) -1 && |
| stat->qid.path == (uint64_t) -1 && |
| stat->mode == -1 && |
| stat->atime == -1 && |
| stat->mtime == -1 && |
| stat->length == -1 && |
| !stat->name.size && |
| !stat->uid.size && |
| !stat->gid.size && |
| !stat->muid.size && |
| stat->n_uid == -1 && |
| stat->n_gid == -1 && |
| stat->n_muid == -1) { |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void v9fs_stat_init(V9fsStat *stat) |
| { |
| v9fs_string_init(&stat->name); |
| v9fs_string_init(&stat->uid); |
| v9fs_string_init(&stat->gid); |
| v9fs_string_init(&stat->muid); |
| v9fs_string_init(&stat->extension); |
| } |
| |
| static void v9fs_stat_free(V9fsStat *stat) |
| { |
| v9fs_string_free(&stat->name); |
| v9fs_string_free(&stat->uid); |
| v9fs_string_free(&stat->gid); |
| v9fs_string_free(&stat->muid); |
| v9fs_string_free(&stat->extension); |
| } |
| |
| static uint32_t stat_to_v9mode(const struct stat *stbuf) |
| { |
| uint32_t mode; |
| |
| mode = stbuf->st_mode & 0777; |
| if (S_ISDIR(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_DIR; |
| } |
| |
| if (S_ISLNK(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_SYMLINK; |
| } |
| |
| if (S_ISSOCK(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_SOCKET; |
| } |
| |
| if (S_ISFIFO(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_NAMED_PIPE; |
| } |
| |
| if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_DEVICE; |
| } |
| |
| if (stbuf->st_mode & S_ISUID) { |
| mode |= P9_STAT_MODE_SETUID; |
| } |
| |
| if (stbuf->st_mode & S_ISGID) { |
| mode |= P9_STAT_MODE_SETGID; |
| } |
| |
| if (stbuf->st_mode & S_ISVTX) { |
| mode |= P9_STAT_MODE_SETVTX; |
| } |
| |
| return mode; |
| } |
| |
| static int coroutine_fn stat_to_v9stat(V9fsPDU *pdu, V9fsPath *path, |
| const char *basename, |
| const struct stat *stbuf, |
| V9fsStat *v9stat) |
| { |
| int err; |
| |
| memset(v9stat, 0, sizeof(*v9stat)); |
| |
| err = stat_to_qid(pdu, stbuf, &v9stat->qid); |
| if (err < 0) { |
| return err; |
| } |
| v9stat->mode = stat_to_v9mode(stbuf); |
| v9stat->atime = stbuf->st_atime; |
| v9stat->mtime = stbuf->st_mtime; |
| v9stat->length = stbuf->st_size; |
| |
| v9fs_string_free(&v9stat->uid); |
| v9fs_string_free(&v9stat->gid); |
| v9fs_string_free(&v9stat->muid); |
| |
| v9stat->n_uid = stbuf->st_uid; |
| v9stat->n_gid = stbuf->st_gid; |
| v9stat->n_muid = 0; |
| |
| v9fs_string_free(&v9stat->extension); |
| |
| if (v9stat->mode & P9_STAT_MODE_SYMLINK) { |
| err = v9fs_co_readlink(pdu, path, &v9stat->extension); |
| if (err < 0) { |
| return err; |
| } |
| } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { |
| v9fs_string_sprintf(&v9stat->extension, "%c %u %u", |
| S_ISCHR(stbuf->st_mode) ? 'c' : 'b', |
| major(stbuf->st_rdev), minor(stbuf->st_rdev)); |
| } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { |
| v9fs_string_sprintf(&v9stat->extension, "%s %lu", |
| "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink); |
| } |
| |
| v9fs_string_sprintf(&v9stat->name, "%s", basename); |
| |
| v9stat->size = 61 + |
| v9fs_string_size(&v9stat->name) + |
| v9fs_string_size(&v9stat->uid) + |
| v9fs_string_size(&v9stat->gid) + |
| v9fs_string_size(&v9stat->muid) + |
| v9fs_string_size(&v9stat->extension); |
| return 0; |
| } |
| |
| #define P9_STATS_MODE 0x00000001ULL |
| #define P9_STATS_NLINK 0x00000002ULL |
| #define P9_STATS_UID 0x00000004ULL |
| #define P9_STATS_GID 0x00000008ULL |
| #define P9_STATS_RDEV 0x00000010ULL |
| #define P9_STATS_ATIME 0x00000020ULL |
| #define P9_STATS_MTIME 0x00000040ULL |
| #define P9_STATS_CTIME 0x00000080ULL |
| #define P9_STATS_INO 0x00000100ULL |
| #define P9_STATS_SIZE 0x00000200ULL |
| #define P9_STATS_BLOCKS 0x00000400ULL |
| |
| #define P9_STATS_BTIME 0x00000800ULL |
| #define P9_STATS_GEN 0x00001000ULL |
| #define P9_STATS_DATA_VERSION 0x00002000ULL |
| |
| #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */ |
| #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */ |
| |
| |
| static int stat_to_v9stat_dotl(V9fsPDU *pdu, const struct stat *stbuf, |
| V9fsStatDotl *v9lstat) |
| { |
| memset(v9lstat, 0, sizeof(*v9lstat)); |
| |
| v9lstat->st_mode = stbuf->st_mode; |
| v9lstat->st_nlink = stbuf->st_nlink; |
| v9lstat->st_uid = stbuf->st_uid; |
| v9lstat->st_gid = stbuf->st_gid; |
| v9lstat->st_rdev = stbuf->st_rdev; |
| v9lstat->st_size = stbuf->st_size; |
| v9lstat->st_blksize = stbuf->st_blksize; |
| v9lstat->st_blocks = stbuf->st_blocks; |
| v9lstat->st_atime_sec = stbuf->st_atime; |
| v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec; |
| v9lstat->st_mtime_sec = stbuf->st_mtime; |
| v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec; |
| v9lstat->st_ctime_sec = stbuf->st_ctime; |
| v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec; |
| /* Currently we only support BASIC fields in stat */ |
| v9lstat->st_result_mask = P9_STATS_BASIC; |
| |
| return stat_to_qid(pdu, stbuf, &v9lstat->qid); |
| } |
| |
| static void print_sg(struct iovec *sg, int cnt) |
| { |
| int i; |
| |
| printf("sg[%d]: {", cnt); |
| for (i = 0; i < cnt; i++) { |
| if (i) { |
| printf(", "); |
| } |
| printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); |
| } |
| printf("}\n"); |
| } |
| |
| /* Will call this only for path name based fid */ |
| static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len) |
| { |
| V9fsPath str; |
| v9fs_path_init(&str); |
| v9fs_path_copy(&str, dst); |
| v9fs_path_sprintf(dst, "%s%s", src->data, str.data + len); |
| v9fs_path_free(&str); |
| } |
| |
| static inline bool is_ro_export(FsContext *ctx) |
| { |
| return ctx->export_flags & V9FS_RDONLY; |
| } |
| |
| static void coroutine_fn v9fs_version(void *opaque) |
| { |
| ssize_t err; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| V9fsString version; |
| size_t offset = 7; |
| |
| v9fs_string_init(&version); |
| err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version); |
| if (err < 0) { |
| goto out; |
| } |
| trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data); |
| |
| virtfs_reset(pdu); |
| |
| if (!strcmp(version.data, "9P2000.u")) { |
| s->proto_version = V9FS_PROTO_2000U; |
| } else if (!strcmp(version.data, "9P2000.L")) { |
| s->proto_version = V9FS_PROTO_2000L; |
| } else { |
| v9fs_string_sprintf(&version, "unknown"); |
| /* skip min. msize check, reporting invalid version has priority */ |
| goto marshal; |
| } |
| |
| if (s->msize < P9_MIN_MSIZE) { |
| err = -EMSGSIZE; |
| error_report( |
| "9pfs: Client requested msize < minimum msize (" |
| stringify(P9_MIN_MSIZE) ") supported by this server." |
| ); |
| goto out; |
| } |
| |
| /* 8192 is the default msize of Linux clients */ |
| if (s->msize <= 8192 && !(s->ctx.export_flags & V9FS_NO_PERF_WARN)) { |
| warn_report_once( |
| "9p: degraded performance: a reasonable high msize should be " |
| "chosen on client/guest side (chosen msize is <= 8192). See " |
| "https://wiki.qemu.org/Documentation/9psetup#msize for details." |
| ); |
| } |
| |
| marshal: |
| err = pdu_marshal(pdu, offset, "ds", s->msize, &version); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data); |
| out: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&version); |
| } |
| |
| static void coroutine_fn v9fs_attach(void *opaque) |
| { |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| int32_t fid, afid, n_uname; |
| V9fsString uname, aname; |
| V9fsFidState *fidp; |
| size_t offset = 7; |
| V9fsQID qid; |
| ssize_t err; |
| |
| v9fs_string_init(&uname); |
| v9fs_string_init(&aname); |
| err = pdu_unmarshal(pdu, offset, "ddssd", &fid, |
| &afid, &uname, &aname, &n_uname); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data); |
| |
| fidp = alloc_fid(s, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| fidp->uid = n_uname; |
| err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path); |
| if (err < 0) { |
| err = -EINVAL; |
| clunk_fid(s, fid); |
| goto out; |
| } |
| err = fid_to_qid(pdu, fidp, &qid); |
| if (err < 0) { |
| err = -EINVAL; |
| clunk_fid(s, fid); |
| goto out; |
| } |
| |
| /* |
| * disable migration if we haven't done already. |
| * attach could get called multiple times for the same export. |
| */ |
| if (!s->migration_blocker) { |
| error_setg(&s->migration_blocker, |
| "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'", |
| s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag); |
| err = migrate_add_blocker(s->migration_blocker, NULL); |
| if (err < 0) { |
| error_free(s->migration_blocker); |
| s->migration_blocker = NULL; |
| clunk_fid(s, fid); |
| goto out; |
| } |
| s->root_fid = fid; |
| } |
| |
| err = pdu_marshal(pdu, offset, "Q", &qid); |
| if (err < 0) { |
| clunk_fid(s, fid); |
| goto out; |
| } |
| err += offset; |
| |
| memcpy(&s->root_qid, &qid, sizeof(qid)); |
| trace_v9fs_attach_return(pdu->tag, pdu->id, |
| qid.type, qid.version, qid.path); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&uname); |
| v9fs_string_free(&aname); |
| } |
| |
| static void coroutine_fn v9fs_stat(void *opaque) |
| { |
| int32_t fid; |
| V9fsStat v9stat; |
| ssize_t err = 0; |
| size_t offset = 7; |
| struct stat stbuf; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| char *basename; |
| |
| err = pdu_unmarshal(pdu, offset, "d", &fid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_stat(pdu->tag, pdu->id, fid); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| basename = g_path_get_basename(fidp->path.data); |
| err = stat_to_v9stat(pdu, &fidp->path, basename, &stbuf, &v9stat); |
| g_free(basename); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "wS", 0, &v9stat); |
| if (err < 0) { |
| v9fs_stat_free(&v9stat); |
| goto out; |
| } |
| trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode, |
| v9stat.atime, v9stat.mtime, v9stat.length); |
| err += offset; |
| v9fs_stat_free(&v9stat); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| static void coroutine_fn v9fs_getattr(void *opaque) |
| { |
| int32_t fid; |
| size_t offset = 7; |
| ssize_t retval = 0; |
| struct stat stbuf; |
| V9fsFidState *fidp; |
| uint64_t request_mask; |
| V9fsStatDotl v9stat_dotl; |
| V9fsPDU *pdu = opaque; |
| |
| retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask); |
| if (retval < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| retval = -ENOENT; |
| goto out_nofid; |
| } |
| /* |
| * Currently we only support BASIC fields in stat, so there is no |
| * need to look at request_mask. |
| */ |
| retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| if (retval < 0) { |
| goto out; |
| } |
| retval = stat_to_v9stat_dotl(pdu, &stbuf, &v9stat_dotl); |
| if (retval < 0) { |
| goto out; |
| } |
| |
| /* fill st_gen if requested and supported by underlying fs */ |
| if (request_mask & P9_STATS_GEN) { |
| retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl); |
| switch (retval) { |
| case 0: |
| /* we have valid st_gen: update result mask */ |
| v9stat_dotl.st_result_mask |= P9_STATS_GEN; |
| break; |
| case -EINTR: |
| /* request cancelled, e.g. by Tflush */ |
| goto out; |
| default: |
| /* failed to get st_gen: not fatal, ignore */ |
| break; |
| } |
| } |
| retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl); |
| if (retval < 0) { |
| goto out; |
| } |
| retval += offset; |
| trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask, |
| v9stat_dotl.st_mode, v9stat_dotl.st_uid, |
| v9stat_dotl.st_gid); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, retval); |
| } |
| |
| /* Attribute flags */ |
| #define P9_ATTR_MODE (1 << 0) |
| #define P9_ATTR_UID (1 << 1) |
| #define P9_ATTR_GID (1 << 2) |
| #define P9_ATTR_SIZE (1 << 3) |
| #define P9_ATTR_ATIME (1 << 4) |
| #define P9_ATTR_MTIME (1 << 5) |
| #define P9_ATTR_CTIME (1 << 6) |
| #define P9_ATTR_ATIME_SET (1 << 7) |
| #define P9_ATTR_MTIME_SET (1 << 8) |
| |
| #define P9_ATTR_MASK 127 |
| |
| static void coroutine_fn v9fs_setattr(void *opaque) |
| { |
| int err = 0; |
| int32_t fid; |
| V9fsFidState *fidp; |
| size_t offset = 7; |
| V9fsIattr v9iattr; |
| V9fsPDU *pdu = opaque; |
| |
| err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| |
| trace_v9fs_setattr(pdu->tag, pdu->id, fid, |
| v9iattr.valid, v9iattr.mode, v9iattr.uid, v9iattr.gid, |
| v9iattr.size, v9iattr.atime_sec, v9iattr.mtime_sec); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| if (v9iattr.valid & P9_ATTR_MODE) { |
| err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) { |
| struct timespec times[2]; |
| if (v9iattr.valid & P9_ATTR_ATIME) { |
| if (v9iattr.valid & P9_ATTR_ATIME_SET) { |
| times[0].tv_sec = v9iattr.atime_sec; |
| times[0].tv_nsec = v9iattr.atime_nsec; |
| } else { |
| times[0].tv_nsec = UTIME_NOW; |
| } |
| } else { |
| times[0].tv_nsec = UTIME_OMIT; |
| } |
| if (v9iattr.valid & P9_ATTR_MTIME) { |
| if (v9iattr.valid & P9_ATTR_MTIME_SET) { |
| times[1].tv_sec = v9iattr.mtime_sec; |
| times[1].tv_nsec = v9iattr.mtime_nsec; |
| } else { |
| times[1].tv_nsec = UTIME_NOW; |
| } |
| } else { |
| times[1].tv_nsec = UTIME_OMIT; |
| } |
| err = v9fs_co_utimensat(pdu, &fidp->path, times); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| /* |
| * If the only valid entry in iattr is ctime we can call |
| * chown(-1,-1) to update the ctime of the file |
| */ |
| if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) || |
| ((v9iattr.valid & P9_ATTR_CTIME) |
| && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) { |
| if (!(v9iattr.valid & P9_ATTR_UID)) { |
| v9iattr.uid = -1; |
| } |
| if (!(v9iattr.valid & P9_ATTR_GID)) { |
| v9iattr.gid = -1; |
| } |
| err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid, |
| v9iattr.gid); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| if (v9iattr.valid & (P9_ATTR_SIZE)) { |
| err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| err = offset; |
| trace_v9fs_setattr_return(pdu->tag, pdu->id); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids) |
| { |
| int i; |
| ssize_t err; |
| size_t offset = 7; |
| |
| err = pdu_marshal(pdu, offset, "w", nwnames); |
| if (err < 0) { |
| return err; |
| } |
| offset += err; |
| for (i = 0; i < nwnames; i++) { |
| err = pdu_marshal(pdu, offset, "Q", &qids[i]); |
| if (err < 0) { |
| return err; |
| } |
| offset += err; |
| } |
| return offset; |
| } |
| |
| static bool name_is_illegal(const char *name) |
| { |
| return !*name || strchr(name, '/') != NULL; |
| } |
| |
| static bool not_same_qid(const V9fsQID *qid1, const V9fsQID *qid2) |
| { |
| return |
| qid1->type != qid2->type || |
| qid1->version != qid2->version || |
| qid1->path != qid2->path; |
| } |
| |
| static void coroutine_fn v9fs_walk(void *opaque) |
| { |
| int name_idx; |
| V9fsQID *qids = NULL; |
| int i, err = 0; |
| V9fsPath dpath, path; |
| uint16_t nwnames; |
| struct stat stbuf; |
| size_t offset = 7; |
| int32_t fid, newfid; |
| V9fsString *wnames = NULL; |
| V9fsFidState *fidp; |
| V9fsFidState *newfidp = NULL; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| V9fsQID qid; |
| |
| err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames); |
| if (err < 0) { |
| pdu_complete(pdu, err); |
| return ; |
| } |
| offset += err; |
| |
| trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames); |
| |
| if (nwnames && nwnames <= P9_MAXWELEM) { |
| wnames = g_new0(V9fsString, nwnames); |
| qids = g_new0(V9fsQID, nwnames); |
| for (i = 0; i < nwnames; i++) { |
| err = pdu_unmarshal(pdu, offset, "s", &wnames[i]); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| if (name_is_illegal(wnames[i].data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| offset += err; |
| } |
| } else if (nwnames > P9_MAXWELEM) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| v9fs_path_init(&dpath); |
| v9fs_path_init(&path); |
| |
| err = fid_to_qid(pdu, fidp, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| |
| /* |
| * Both dpath and path initially poin to fidp. |
| * Needed to handle request with nwnames == 0 |
| */ |
| v9fs_path_copy(&dpath, &fidp->path); |
| v9fs_path_copy(&path, &fidp->path); |
| for (name_idx = 0; name_idx < nwnames; name_idx++) { |
| if (not_same_qid(&pdu->s->root_qid, &qid) || |
| strcmp("..", wnames[name_idx].data)) { |
| err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, |
| &path); |
| if (err < 0) { |
| goto out; |
| } |
| |
| err = v9fs_co_lstat(pdu, &path, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = stat_to_qid(pdu, &stbuf, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| v9fs_path_copy(&dpath, &path); |
| } |
| memcpy(&qids[name_idx], &qid, sizeof(qid)); |
| } |
| if (fid == newfid) { |
| if (fidp->fid_type != P9_FID_NONE) { |
| err = -EINVAL; |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| v9fs_path_copy(&fidp->path, &path); |
| v9fs_path_unlock(s); |
| } else { |
| newfidp = alloc_fid(s, newfid); |
| if (newfidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| newfidp->uid = fidp->uid; |
| v9fs_path_copy(&newfidp->path, &path); |
| } |
| err = v9fs_walk_marshal(pdu, nwnames, qids); |
| trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids); |
| out: |
| put_fid(pdu, fidp); |
| if (newfidp) { |
| put_fid(pdu, newfidp); |
| } |
| v9fs_path_free(&dpath); |
| v9fs_path_free(&path); |
| out_nofid: |
| pdu_complete(pdu, err); |
| if (nwnames && nwnames <= P9_MAXWELEM) { |
| for (name_idx = 0; name_idx < nwnames; name_idx++) { |
| v9fs_string_free(&wnames[name_idx]); |
| } |
| g_free(wnames); |
| g_free(qids); |
| } |
| } |
| |
| static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path) |
| { |
| struct statfs stbuf; |
| int32_t iounit = 0; |
| V9fsState *s = pdu->s; |
| |
| /* |
| * iounit should be multiples of f_bsize (host filesystem block size |
| * and as well as less than (client msize - P9_IOHDRSZ)) |
| */ |
| if (!v9fs_co_statfs(pdu, path, &stbuf)) { |
| if (stbuf.f_bsize) { |
| iounit = stbuf.f_bsize; |
| iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize; |
| } |
| } |
| if (!iounit) { |
| iounit = s->msize - P9_IOHDRSZ; |
| } |
| return iounit; |
| } |
| |
| static void coroutine_fn v9fs_open(void *opaque) |
| { |
| int flags; |
| int32_t fid; |
| int32_t mode; |
| V9fsQID qid; |
| int iounit = 0; |
| ssize_t err = 0; |
| size_t offset = 7; |
| struct stat stbuf; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| if (s->proto_version == V9FS_PROTO_2000L) { |
| err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode); |
| } else { |
| uint8_t modebyte; |
| err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte); |
| mode = modebyte; |
| } |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_open(pdu->tag, pdu->id, fid, mode); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| if (fidp->fid_type != P9_FID_NONE) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = stat_to_qid(pdu, &stbuf, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| if (S_ISDIR(stbuf.st_mode)) { |
| err = v9fs_co_opendir(pdu, fidp); |
| if (err < 0) { |
| goto out; |
| } |
| fidp->fid_type = P9_FID_DIR; |
| err = pdu_marshal(pdu, offset, "Qd", &qid, 0); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| } else { |
| if (s->proto_version == V9FS_PROTO_2000L) { |
| flags = get_dotl_openflags(s, mode); |
| } else { |
| flags = omode_to_uflags(mode); |
| } |
| if (is_ro_export(&s->ctx)) { |
| if (mode & O_WRONLY || mode & O_RDWR || |
| mode & O_APPEND || mode & O_TRUNC) { |
| err = -EROFS; |
| goto out; |
| } |
| } |
| err = v9fs_co_open(pdu, fidp, flags); |
| if (err < 0) { |
| goto out; |
| } |
| fidp->fid_type = P9_FID_FILE; |
| fidp->open_flags = flags; |
| if (flags & O_EXCL) { |
| /* |
| * We let the host file system do O_EXCL check |
| * We should not reclaim such fd |
| */ |
| fidp->flags |= FID_NON_RECLAIMABLE; |
| } |
| iounit = get_iounit(pdu, &fidp->path); |
| err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| } |
| trace_v9fs_open_return(pdu->tag, pdu->id, |
| qid.type, qid.version, qid.path, iounit); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| static void coroutine_fn v9fs_lcreate(void *opaque) |
| { |
| int32_t dfid, flags, mode; |
| gid_t gid; |
| ssize_t err = 0; |
| ssize_t offset = 7; |
| V9fsString name; |
| V9fsFidState *fidp; |
| struct stat stbuf; |
| V9fsQID qid; |
| int32_t iounit; |
| V9fsPDU *pdu = opaque; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dsddd", &dfid, |
| &name, &flags, &mode, &gid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid); |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
| err = -EEXIST; |
| goto out_nofid; |
| } |
| |
| fidp = get_fid(pdu, dfid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| if (fidp->fid_type != P9_FID_NONE) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| flags = get_dotl_openflags(pdu->s, flags); |
| err = v9fs_co_open2(pdu, fidp, &name, gid, |
| flags | O_CREAT, mode, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| fidp->fid_type = P9_FID_FILE; |
| fidp->open_flags = flags; |
| if (flags & O_EXCL) { |
| /* |
| * We let the host file system do O_EXCL check |
| * We should not reclaim such fd |
| */ |
| fidp->flags |= FID_NON_RECLAIMABLE; |
| } |
| iounit = get_iounit(pdu, &fidp->path); |
| err = stat_to_qid(pdu, &stbuf, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_lcreate_return(pdu->tag, pdu->id, |
| qid.type, qid.version, qid.path, iounit); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| } |
| |
| static void coroutine_fn v9fs_fsync(void *opaque) |
| { |
| int err; |
| int32_t fid; |
| int datasync; |
| size_t offset = 7; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| |
| err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| err = v9fs_co_fsync(pdu, fidp, datasync); |
| if (!err) { |
| err = offset; |
| } |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| static void coroutine_fn v9fs_clunk(void *opaque) |
| { |
| int err; |
| int32_t fid; |
| size_t offset = 7; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| err = pdu_unmarshal(pdu, offset, "d", &fid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_clunk(pdu->tag, pdu->id, fid); |
| |
| fidp = clunk_fid(s, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| /* |
| * Bump the ref so that put_fid will |
| * free the fid. |
| */ |
| fidp->ref++; |
| err = put_fid(pdu, fidp); |
| if (!err) { |
| err = offset; |
| } |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| /* |
| * Create a QEMUIOVector for a sub-region of PDU iovecs |
| * |
| * @qiov: uninitialized QEMUIOVector |
| * @skip: number of bytes to skip from beginning of PDU |
| * @size: number of bytes to include |
| * @is_write: true - write, false - read |
| * |
| * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up |
| * with qemu_iovec_destroy(). |
| */ |
| static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, |
| size_t skip, size_t size, |
| bool is_write) |
| { |
| QEMUIOVector elem; |
| struct iovec *iov; |
| unsigned int niov; |
| |
| if (is_write) { |
| pdu->s->transport->init_out_iov_from_pdu(pdu, &iov, &niov, size + skip); |
| } else { |
| pdu->s->transport->init_in_iov_from_pdu(pdu, &iov, &niov, size + skip); |
| } |
| |
| qemu_iovec_init_external(&elem, iov, niov); |
| qemu_iovec_init(qiov, niov); |
| qemu_iovec_concat(qiov, &elem, skip, size); |
| } |
| |
| static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
| uint64_t off, uint32_t max_count) |
| { |
| ssize_t err; |
| size_t offset = 7; |
| uint64_t read_count; |
| QEMUIOVector qiov_full; |
| |
| if (fidp->fs.xattr.len < off) { |
| read_count = 0; |
| } else { |
| read_count = fidp->fs.xattr.len - off; |
| } |
| if (read_count > max_count) { |
| read_count = max_count; |
| } |
| err = pdu_marshal(pdu, offset, "d", read_count); |
| if (err < 0) { |
| return err; |
| } |
| offset += err; |
| |
| v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, read_count, false); |
| err = v9fs_pack(qiov_full.iov, qiov_full.niov, 0, |
| ((char *)fidp->fs.xattr.value) + off, |
| read_count); |
| qemu_iovec_destroy(&qiov_full); |
| if (err < 0) { |
| return err; |
| } |
| offset += err; |
| return offset; |
| } |
| |
| static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, |
| V9fsFidState *fidp, |
| uint32_t max_count) |
| { |
| V9fsPath path; |
| V9fsStat v9stat; |
| int len, err = 0; |
| int32_t count = 0; |
| struct stat stbuf; |
| off_t saved_dir_pos; |
| struct dirent *dent; |
| |
| /* save the directory position */ |
| saved_dir_pos = v9fs_co_telldir(pdu, fidp); |
| if (saved_dir_pos < 0) { |
| return saved_dir_pos; |
| } |
| |
| while (1) { |
| v9fs_path_init(&path); |
| |
| v9fs_readdir_lock(&fidp->fs.dir); |
| |
| err = v9fs_co_readdir(pdu, fidp, &dent); |
| if (err || !dent) { |
| break; |
| } |
| err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path); |
| if (err < 0) { |
| break; |
| } |
| err = v9fs_co_lstat(pdu, &path, &stbuf); |
| if (err < 0) { |
| break; |
| } |
| err = stat_to_v9stat(pdu, &path, dent->d_name, &stbuf, &v9stat); |
| if (err < 0) { |
| break; |
| } |
| if ((count + v9stat.size + 2) > max_count) { |
| v9fs_readdir_unlock(&fidp->fs.dir); |
| |
| /* Ran out of buffer. Set dir back to old position and return */ |
| v9fs_co_seekdir(pdu, fidp, saved_dir_pos); |
| v9fs_stat_free(&v9stat); |
| v9fs_path_free(&path); |
| return count; |
| } |
| |
| /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
| len = pdu_marshal(pdu, 11 + count, "S", &v9stat); |
| |
| v9fs_readdir_unlock(&fidp->fs.dir); |
| |
| if (len < 0) { |
| v9fs_co_seekdir(pdu, fidp, saved_dir_pos); |
| v9fs_stat_free(&v9stat); |
| v9fs_path_free(&path); |
| return len; |
| } |
| count += len; |
| v9fs_stat_free(&v9stat); |
| v9fs_path_free(&path); |
| saved_dir_pos = dent->d_off; |
| } |
| |
| v9fs_readdir_unlock(&fidp->fs.dir); |
| |
| v9fs_path_free(&path); |
| if (err < 0) { |
| return err; |
| } |
| return count; |
| } |
| |
| static void coroutine_fn v9fs_read(void *opaque) |
| { |
| int32_t fid; |
| uint64_t off; |
| ssize_t err = 0; |
| int32_t count = 0; |
| size_t offset = 7; |
| uint32_t max_count; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| if (fidp->fid_type == P9_FID_DIR) { |
| if (s->proto_version != V9FS_PROTO_2000U) { |
| warn_report_once( |
| "9p: bad client: T_read request on directory only expected " |
| "with 9P2000.u protocol version" |
| ); |
| err = -EOPNOTSUPP; |
| goto out; |
| } |
| if (off == 0) { |
| v9fs_co_rewinddir(pdu, fidp); |
| } |
| count = v9fs_do_readdir_with_stat(pdu, fidp, max_count); |
| if (count < 0) { |
| err = count; |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "d", count); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset + count; |
| } else if (fidp->fid_type == P9_FID_FILE) { |
| QEMUIOVector qiov_full; |
| QEMUIOVector qiov; |
| int32_t len; |
| |
| v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false); |
| qemu_iovec_init(&qiov, qiov_full.niov); |
| do { |
| qemu_iovec_reset(&qiov); |
| qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count); |
| if (0) { |
| print_sg(qiov.iov, qiov.niov); |
| } |
| /* Loop in case of EINTR */ |
| do { |
| len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off); |
| if (len >= 0) { |
| off += len; |
| count += len; |
| } |
| } while (len == -EINTR && !pdu->cancelled); |
| if (len < 0) { |
| /* IO error return the error */ |
| err = len; |
| goto out_free_iovec; |
| } |
| } while (count < max_count && len > 0); |
| err = pdu_marshal(pdu, offset, "d", count); |
| if (err < 0) { |
| goto out_free_iovec; |
| } |
| err += offset + count; |
| out_free_iovec: |
| qemu_iovec_destroy(&qiov); |
| qemu_iovec_destroy(&qiov_full); |
| } else if (fidp->fid_type == P9_FID_XATTR) { |
| err = v9fs_xattr_read(s, pdu, fidp, off, max_count); |
| } else { |
| err = -EINVAL; |
| } |
| trace_v9fs_read_return(pdu->tag, pdu->id, count, err); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| /** |
| * Returns size required in Rreaddir response for the passed dirent @p name. |
| * |
| * @param name - directory entry's name (i.e. file name, directory name) |
| * @returns required size in bytes |
| */ |
| size_t v9fs_readdir_response_size(V9fsString *name) |
| { |
| /* |
| * Size of each dirent on the wire: size of qid (13) + size of offset (8) |
| * size of type (1) + size of name.size (2) + strlen(name.data) |
| */ |
| return 24 + v9fs_string_size(name); |
| } |
| |
| static void v9fs_free_dirents(struct V9fsDirEnt *e) |
| { |
| struct V9fsDirEnt *next = NULL; |
| |
| for (; e; e = next) { |
| next = e->next; |
| g_free(e->dent); |
| g_free(e->st); |
| g_free(e); |
| } |
| } |
| |
| static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, |
| off_t offset, int32_t max_count) |
| { |
| size_t size; |
| V9fsQID qid; |
| V9fsString name; |
| int len, err = 0; |
| int32_t count = 0; |
| struct dirent *dent; |
| struct stat *st; |
| struct V9fsDirEnt *entries = NULL; |
| |
| /* |
| * inode remapping requires the device id, which in turn might be |
| * different for different directory entries, so if inode remapping is |
| * enabled we have to make a full stat for each directory entry |
| */ |
| const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES; |
| |
| /* |
| * Fetch all required directory entries altogether on a background IO |
| * thread from fs driver. We don't want to do that for each entry |
| * individually, because hopping between threads (this main IO thread |
| * and background IO driver thread) would sum up to huge latencies. |
| */ |
| count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count, |
| dostat); |
| if (count < 0) { |
| err = count; |
| count = 0; |
| goto out; |
| } |
| count = 0; |
| |
| for (struct V9fsDirEnt *e = entries; e; e = e->next) { |
| dent = e->dent; |
| |
| if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) { |
| st = e->st; |
| /* e->st should never be NULL, but just to be sure */ |
| if (!st) { |
| err = -1; |
| break; |
| } |
| |
| /* remap inode */ |
| err = stat_to_qid(pdu, st, &qid); |
| if (err < 0) { |
| break; |
| } |
| } else { |
| /* |
| * Fill up just the path field of qid because the client uses |
| * only that. To fill the entire qid structure we will have |
| * to stat each dirent found, which is expensive. For the |
| * latter reason we don't call stat_to_qid() here. Only drawback |
| * is that no multi-device export detection of stat_to_qid() |
| * would be done and provided as error to the user here. But |
| * user would get that error anyway when accessing those |
| * files/dirs through other ways. |
| */ |
| size = MIN(sizeof(dent->d_ino), sizeof(qid.path)); |
| memcpy(&qid.path, &dent->d_ino, size); |
| /* Fill the other fields with dummy values */ |
| qid.type = 0; |
| qid.version = 0; |
| } |
| |
| v9fs_string_init(&name); |
| v9fs_string_sprintf(&name, "%s", dent->d_name); |
| |
| /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */ |
| len = pdu_marshal(pdu, 11 + count, "Qqbs", |
| &qid, dent->d_off, |
| dent->d_type, &name); |
| |
| v9fs_string_free(&name); |
| |
| if (len < 0) { |
| err = len; |
| break; |
| } |
| |
| count += len; |
| } |
| |
| out: |
| v9fs_free_dirents(entries); |
| if (err < 0) { |
| return err; |
| } |
| return count; |
| } |
| |
| static void coroutine_fn v9fs_readdir(void *opaque) |
| { |
| int32_t fid; |
| V9fsFidState *fidp; |
| ssize_t retval = 0; |
| size_t offset = 7; |
| uint64_t initial_offset; |
| int32_t count; |
| uint32_t max_count; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| retval = pdu_unmarshal(pdu, offset, "dqd", &fid, |
| &initial_offset, &max_count); |
| if (retval < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count); |
| |
| /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */ |
| if (max_count > s->msize - 11) { |
| max_count = s->msize - 11; |
| warn_report_once( |
| "9p: bad client: T_readdir with count > msize - 11" |
| ); |
| } |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| retval = -EINVAL; |
| goto out_nofid; |
| } |
| if (!fidp->fs.dir.stream) { |
| retval = -EINVAL; |
| goto out; |
| } |
| if (s->proto_version != V9FS_PROTO_2000L) { |
| warn_report_once( |
| "9p: bad client: T_readdir request only expected with 9P2000.L " |
| "protocol version" |
| ); |
| retval = -EOPNOTSUPP; |
| goto out; |
| } |
| count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count); |
| if (count < 0) { |
| retval = count; |
| goto out; |
| } |
| retval = pdu_marshal(pdu, offset, "d", count); |
| if (retval < 0) { |
| goto out; |
| } |
| retval += count + offset; |
| trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, retval); |
| } |
| |
| static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, |
| uint64_t off, uint32_t count, |
| struct iovec *sg, int cnt) |
| { |
| int i, to_copy; |
| ssize_t err = 0; |
| uint64_t write_count; |
| size_t offset = 7; |
| |
| |
| if (fidp->fs.xattr.len < off) { |
| return -ENOSPC; |
| } |
| write_count = fidp->fs.xattr.len - off; |
| if (write_count > count) { |
| write_count = count; |
| } |
| err = pdu_marshal(pdu, offset, "d", write_count); |
| if (err < 0) { |
| return err; |
| } |
| err += offset; |
| fidp->fs.xattr.copied_len += write_count; |
| /* |
| * Now copy the content from sg list |
| */ |
| for (i = 0; i < cnt; i++) { |
| if (write_count > sg[i].iov_len) { |
| to_copy = sg[i].iov_len; |
| } else { |
| to_copy = write_count; |
| } |
| memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy); |
| /* updating vs->off since we are not using below */ |
| off += to_copy; |
| write_count -= to_copy; |
| } |
| |
| return err; |
| } |
| |
| static void coroutine_fn v9fs_write(void *opaque) |
| { |
| ssize_t err; |
| int32_t fid; |
| uint64_t off; |
| uint32_t count; |
| int32_t len = 0; |
| int32_t total = 0; |
| size_t offset = 7; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| QEMUIOVector qiov_full; |
| QEMUIOVector qiov; |
| |
| err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count); |
| if (err < 0) { |
| pdu_complete(pdu, err); |
| return; |
| } |
| offset += err; |
| v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true); |
| trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| if (fidp->fid_type == P9_FID_FILE) { |
| if (fidp->fs.fd == -1) { |
| err = -EINVAL; |
| goto out; |
| } |
| } else if (fidp->fid_type == P9_FID_XATTR) { |
| /* |
| * setxattr operation |
| */ |
| err = v9fs_xattr_write(s, pdu, fidp, off, count, |
| qiov_full.iov, qiov_full.niov); |
| goto out; |
| } else { |
| err = -EINVAL; |
| goto out; |
| } |
| qemu_iovec_init(&qiov, qiov_full.niov); |
| do { |
| qemu_iovec_reset(&qiov); |
| qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total); |
| if (0) { |
| print_sg(qiov.iov, qiov.niov); |
| } |
| /* Loop in case of EINTR */ |
| do { |
| len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off); |
| if (len >= 0) { |
| off += len; |
| total += len; |
| } |
| } while (len == -EINTR && !pdu->cancelled); |
| if (len < 0) { |
| /* IO error return the error */ |
| err = len; |
| goto out_qiov; |
| } |
| } while (total < count && len > 0); |
| |
| offset = 7; |
| err = pdu_marshal(pdu, offset, "d", total); |
| if (err < 0) { |
| goto out_qiov; |
| } |
| err += offset; |
| trace_v9fs_write_return(pdu->tag, pdu->id, total, err); |
| out_qiov: |
| qemu_iovec_destroy(&qiov); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| qemu_iovec_destroy(&qiov_full); |
| pdu_complete(pdu, err); |
| } |
| |
| static void coroutine_fn v9fs_create(void *opaque) |
| { |
| int32_t fid; |
| int err = 0; |
| size_t offset = 7; |
| V9fsFidState *fidp; |
| V9fsQID qid; |
| int32_t perm; |
| int8_t mode; |
| V9fsPath path; |
| struct stat stbuf; |
| V9fsString name; |
| V9fsString extension; |
| int iounit; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| v9fs_path_init(&path); |
| v9fs_string_init(&name); |
| v9fs_string_init(&extension); |
| err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name, |
| &perm, &mode, &extension); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode); |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
| err = -EEXIST; |
| goto out_nofid; |
| } |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| if (fidp->fid_type != P9_FID_NONE) { |
| err = -EINVAL; |
| goto out; |
| } |
| if (perm & P9_STAT_MODE_DIR) { |
| err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777, |
| fidp->uid, -1, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| if (err < 0) { |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| v9fs_path_copy(&fidp->path, &path); |
| v9fs_path_unlock(s); |
| err = v9fs_co_opendir(pdu, fidp); |
| if (err < 0) { |
| goto out; |
| } |
| fidp->fid_type = P9_FID_DIR; |
| } else if (perm & P9_STAT_MODE_SYMLINK) { |
| err = v9fs_co_symlink(pdu, fidp, &name, |
| extension.data, -1 , &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| if (err < 0) { |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| v9fs_path_copy(&fidp->path, &path); |
| v9fs_path_unlock(s); |
| } else if (perm & P9_STAT_MODE_LINK) { |
| int32_t ofid = atoi(extension.data); |
| V9fsFidState *ofidp = get_fid(pdu, ofid); |
| if (ofidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| err = v9fs_co_link(pdu, ofidp, fidp, &name); |
| put_fid(pdu, ofidp); |
| if (err < 0) { |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| if (err < 0) { |
| fidp->fid_type = P9_FID_NONE; |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| v9fs_path_copy(&fidp->path, &path); |
| v9fs_path_unlock(s); |
| err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| if (err < 0) { |
| fidp->fid_type = P9_FID_NONE; |
| goto out; |
| } |
| } else if (perm & P9_STAT_MODE_DEVICE) { |
| char ctype; |
| uint32_t major, minor; |
| mode_t nmode = 0; |
| |
| if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) { |
| err = -errno; |
| goto out; |
| } |
| |
| switch (ctype) { |
| case 'c': |
| nmode = S_IFCHR; |
| break; |
| case 'b': |
| nmode = S_IFBLK; |
| break; |
| default: |
| err = -EIO; |
| goto out; |
| } |
| |
| nmode |= perm & 0777; |
| err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
| makedev(major, minor), nmode, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| if (err < 0) { |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| v9fs_path_copy(&fidp->path, &path); |
| v9fs_path_unlock(s); |
| } else if (perm & P9_STAT_MODE_NAMED_PIPE) { |
| err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
| 0, S_IFIFO | (perm & 0777), &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| if (err < 0) { |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| v9fs_path_copy(&fidp->path, &path); |
| v9fs_path_unlock(s); |
| } else if (perm & P9_STAT_MODE_SOCKET) { |
| err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1, |
| 0, S_IFSOCK | (perm & 0777), &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path); |
| if (err < 0) { |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| v9fs_path_copy(&fidp->path, &path); |
| v9fs_path_unlock(s); |
| } else { |
| err = v9fs_co_open2(pdu, fidp, &name, -1, |
| omode_to_uflags(mode)|O_CREAT, perm, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| fidp->fid_type = P9_FID_FILE; |
| fidp->open_flags = omode_to_uflags(mode); |
| if (fidp->open_flags & O_EXCL) { |
| /* |
| * We let the host file system do O_EXCL check |
| * We should not reclaim such fd |
| */ |
| fidp->flags |= FID_NON_RECLAIMABLE; |
| } |
| } |
| iounit = get_iounit(pdu, &fidp->path); |
| err = stat_to_qid(pdu, &stbuf, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "Qd", &qid, iounit); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_create_return(pdu->tag, pdu->id, |
| qid.type, qid.version, qid.path, iounit); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| v9fs_string_free(&extension); |
| v9fs_path_free(&path); |
| } |
| |
| static void coroutine_fn v9fs_symlink(void *opaque) |
| { |
| V9fsPDU *pdu = opaque; |
| V9fsString name; |
| V9fsString symname; |
| V9fsFidState *dfidp; |
| V9fsQID qid; |
| struct stat stbuf; |
| int32_t dfid; |
| int err = 0; |
| gid_t gid; |
| size_t offset = 7; |
| |
| v9fs_string_init(&name); |
| v9fs_string_init(&symname); |
| err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid); |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
| err = -EEXIST; |
| goto out_nofid; |
| } |
| |
| dfidp = get_fid(pdu, dfid); |
| if (dfidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = stat_to_qid(pdu, &stbuf, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "Q", &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_symlink_return(pdu->tag, pdu->id, |
| qid.type, qid.version, qid.path); |
| out: |
| put_fid(pdu, dfidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| v9fs_string_free(&symname); |
| } |
| |
| static void coroutine_fn v9fs_flush(void *opaque) |
| { |
| ssize_t err; |
| int16_t tag; |
| size_t offset = 7; |
| V9fsPDU *cancel_pdu = NULL; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| err = pdu_unmarshal(pdu, offset, "w", &tag); |
| if (err < 0) { |
| pdu_complete(pdu, err); |
| return; |
| } |
| trace_v9fs_flush(pdu->tag, pdu->id, tag); |
| |
| if (pdu->tag == tag) { |
| warn_report("the guest sent a self-referencing 9P flush request"); |
| } else { |
| QLIST_FOREACH(cancel_pdu, &s->active_list, next) { |
| if (cancel_pdu->tag == tag) { |
| break; |
| } |
| } |
| } |
| if (cancel_pdu) { |
| cancel_pdu->cancelled = 1; |
| /* |
| * Wait for pdu to complete. |
| */ |
| qemu_co_queue_wait(&cancel_pdu->complete, NULL); |
| if (!qemu_co_queue_next(&cancel_pdu->complete)) { |
| cancel_pdu->cancelled = 0; |
| pdu_free(cancel_pdu); |
| } |
| } |
| pdu_complete(pdu, 7); |
| } |
| |
| static void coroutine_fn v9fs_link(void *opaque) |
| { |
| V9fsPDU *pdu = opaque; |
| int32_t dfid, oldfid; |
| V9fsFidState *dfidp, *oldfidp; |
| V9fsString name; |
| size_t offset = 7; |
| int err = 0; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data); |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
| err = -EEXIST; |
| goto out_nofid; |
| } |
| |
| dfidp = get_fid(pdu, dfid); |
| if (dfidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| oldfidp = get_fid(pdu, oldfid); |
| if (oldfidp == NULL) { |
| err = -ENOENT; |
| goto out; |
| } |
| err = v9fs_co_link(pdu, oldfidp, dfidp, &name); |
| if (!err) { |
| err = offset; |
| } |
| put_fid(pdu, oldfidp); |
| out: |
| put_fid(pdu, dfidp); |
| out_nofid: |
| v9fs_string_free(&name); |
| pdu_complete(pdu, err); |
| } |
| |
| /* Only works with path name based fid */ |
| static void coroutine_fn v9fs_remove(void *opaque) |
| { |
| int32_t fid; |
| int err = 0; |
| size_t offset = 7; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| |
| err = pdu_unmarshal(pdu, offset, "d", &fid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_remove(pdu->tag, pdu->id, fid); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| /* if fs driver is not path based, return EOPNOTSUPP */ |
| if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
| err = -EOPNOTSUPP; |
| goto out_err; |
| } |
| /* |
| * IF the file is unlinked, we cannot reopen |
| * the file later. So don't reclaim fd |
| */ |
| err = v9fs_mark_fids_unreclaim(pdu, &fidp->path); |
| if (err < 0) { |
| goto out_err; |
| } |
| err = v9fs_co_remove(pdu, &fidp->path); |
| if (!err) { |
| err = offset; |
| } |
| out_err: |
| /* For TREMOVE we need to clunk the fid even on failed remove */ |
| clunk_fid(pdu->s, fidp->fid); |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| static void coroutine_fn v9fs_unlinkat(void *opaque) |
| { |
| int err = 0; |
| V9fsString name; |
| int32_t dfid, flags, rflags = 0; |
| size_t offset = 7; |
| V9fsPath path; |
| V9fsFidState *dfidp; |
| V9fsPDU *pdu = opaque; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data)) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| |
| if (!strcmp("..", name.data)) { |
| err = -ENOTEMPTY; |
| goto out_nofid; |
| } |
| |
| if (flags & ~P9_DOTL_AT_REMOVEDIR) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| |
| if (flags & P9_DOTL_AT_REMOVEDIR) { |
| rflags |= AT_REMOVEDIR; |
| } |
| |
| dfidp = get_fid(pdu, dfid); |
| if (dfidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| /* |
| * IF the file is unlinked, we cannot reopen |
| * the file later. So don't reclaim fd |
| */ |
| v9fs_path_init(&path); |
| err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path); |
| if (err < 0) { |
| goto out_err; |
| } |
| err = v9fs_mark_fids_unreclaim(pdu, &path); |
| if (err < 0) { |
| goto out_err; |
| } |
| err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, rflags); |
| if (!err) { |
| err = offset; |
| } |
| out_err: |
| put_fid(pdu, dfidp); |
| v9fs_path_free(&path); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| } |
| |
| |
| /* Only works with path name based fid */ |
| static int coroutine_fn v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp, |
| int32_t newdirfid, |
| V9fsString *name) |
| { |
| int err = 0; |
| V9fsPath new_path; |
| V9fsFidState *tfidp; |
| V9fsState *s = pdu->s; |
| V9fsFidState *dirfidp = NULL; |
| |
| v9fs_path_init(&new_path); |
| if (newdirfid != -1) { |
| dirfidp = get_fid(pdu, newdirfid); |
| if (dirfidp == NULL) { |
| return -ENOENT; |
| } |
| if (fidp->fid_type != P9_FID_NONE) { |
| err = -EINVAL; |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path); |
| if (err < 0) { |
| goto out; |
| } |
| } else { |
| char *dir_name = g_path_get_dirname(fidp->path.data); |
| V9fsPath dir_path; |
| |
| v9fs_path_init(&dir_path); |
| v9fs_path_sprintf(&dir_path, "%s", dir_name); |
| g_free(dir_name); |
| |
| err = v9fs_co_name_to_path(pdu, &dir_path, name->data, &new_path); |
| v9fs_path_free(&dir_path); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| err = v9fs_co_rename(pdu, &fidp->path, &new_path); |
| if (err < 0) { |
| goto out; |
| } |
| /* |
| * Fixup fid's pointing to the old name to |
| * start pointing to the new name |
| */ |
| for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { |
| if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) { |
| /* replace the name */ |
| v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data)); |
| } |
| } |
| out: |
| if (dirfidp) { |
| put_fid(pdu, dirfidp); |
| } |
| v9fs_path_free(&new_path); |
| return err; |
| } |
| |
| /* Only works with path name based fid */ |
| static void coroutine_fn v9fs_rename(void *opaque) |
| { |
| int32_t fid; |
| ssize_t err = 0; |
| size_t offset = 7; |
| V9fsString name; |
| int32_t newdirfid; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
| err = -EISDIR; |
| goto out_nofid; |
| } |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| if (fidp->fid_type != P9_FID_NONE) { |
| err = -EINVAL; |
| goto out; |
| } |
| /* if fs driver is not path based, return EOPNOTSUPP */ |
| if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) { |
| err = -EOPNOTSUPP; |
| goto out; |
| } |
| v9fs_path_write_lock(s); |
| err = v9fs_complete_rename(pdu, fidp, newdirfid, &name); |
| v9fs_path_unlock(s); |
| if (!err) { |
| err = offset; |
| } |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| } |
| |
| static int coroutine_fn v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir, |
| V9fsString *old_name, |
| V9fsPath *newdir, |
| V9fsString *new_name) |
| { |
| V9fsFidState *tfidp; |
| V9fsPath oldpath, newpath; |
| V9fsState *s = pdu->s; |
| int err; |
| |
| v9fs_path_init(&oldpath); |
| v9fs_path_init(&newpath); |
| err = v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath); |
| if (err < 0) { |
| goto out; |
| } |
| err = v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath); |
| if (err < 0) { |
| goto out; |
| } |
| |
| /* |
| * Fixup fid's pointing to the old name to |
| * start pointing to the new name |
| */ |
| for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) { |
| if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) { |
| /* replace the name */ |
| v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data)); |
| } |
| } |
| out: |
| v9fs_path_free(&oldpath); |
| v9fs_path_free(&newpath); |
| return err; |
| } |
| |
| static int coroutine_fn v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid, |
| V9fsString *old_name, |
| int32_t newdirfid, |
| V9fsString *new_name) |
| { |
| int err = 0; |
| V9fsState *s = pdu->s; |
| V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL; |
| |
| olddirfidp = get_fid(pdu, olddirfid); |
| if (olddirfidp == NULL) { |
| err = -ENOENT; |
| goto out; |
| } |
| if (newdirfid != -1) { |
| newdirfidp = get_fid(pdu, newdirfid); |
| if (newdirfidp == NULL) { |
| err = -ENOENT; |
| goto out; |
| } |
| } else { |
| newdirfidp = get_fid(pdu, olddirfid); |
| } |
| |
| err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name, |
| &newdirfidp->path, new_name); |
| if (err < 0) { |
| goto out; |
| } |
| if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { |
| /* Only for path based fid we need to do the below fixup */ |
| err = v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name, |
| &newdirfidp->path, new_name); |
| } |
| out: |
| if (olddirfidp) { |
| put_fid(pdu, olddirfidp); |
| } |
| if (newdirfidp) { |
| put_fid(pdu, newdirfidp); |
| } |
| return err; |
| } |
| |
| static void coroutine_fn v9fs_renameat(void *opaque) |
| { |
| ssize_t err = 0; |
| size_t offset = 7; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| int32_t olddirfid, newdirfid; |
| V9fsString old_name, new_name; |
| |
| v9fs_string_init(&old_name); |
| v9fs_string_init(&new_name); |
| err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid, |
| &old_name, &newdirfid, &new_name); |
| if (err < 0) { |
| goto out_err; |
| } |
| |
| if (name_is_illegal(old_name.data) || name_is_illegal(new_name.data)) { |
| err = -ENOENT; |
| goto out_err; |
| } |
| |
| if (!strcmp(".", old_name.data) || !strcmp("..", old_name.data) || |
| !strcmp(".", new_name.data) || !strcmp("..", new_name.data)) { |
| err = -EISDIR; |
| goto out_err; |
| } |
| |
| v9fs_path_write_lock(s); |
| err = v9fs_complete_renameat(pdu, olddirfid, |
| &old_name, newdirfid, &new_name); |
| v9fs_path_unlock(s); |
| if (!err) { |
| err = offset; |
| } |
| |
| out_err: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&old_name); |
| v9fs_string_free(&new_name); |
| } |
| |
| static void coroutine_fn v9fs_wstat(void *opaque) |
| { |
| int32_t fid; |
| int err = 0; |
| int16_t unused; |
| V9fsStat v9stat; |
| size_t offset = 7; |
| struct stat stbuf; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| v9fs_stat_init(&v9stat); |
| err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_wstat(pdu->tag, pdu->id, fid, |
| v9stat.mode, v9stat.atime, v9stat.mtime); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| /* do we need to sync the file? */ |
| if (donttouch_stat(&v9stat)) { |
| err = v9fs_co_fsync(pdu, fidp, 0); |
| goto out; |
| } |
| if (v9stat.mode != -1) { |
| uint32_t v9_mode; |
| err = v9fs_co_lstat(pdu, &fidp->path, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| v9_mode = stat_to_v9mode(&stbuf); |
| if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) != |
| (v9_mode & P9_STAT_MODE_TYPE_BITS)) { |
| /* Attempting to change the type */ |
| err = -EIO; |
| goto out; |
| } |
| err = v9fs_co_chmod(pdu, &fidp->path, |
| v9mode_to_mode(v9stat.mode, |
| &v9stat.extension)); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| if (v9stat.mtime != -1 || v9stat.atime != -1) { |
| struct timespec times[2]; |
| if (v9stat.atime != -1) { |
| times[0].tv_sec = v9stat.atime; |
| times[0].tv_nsec = 0; |
| } else { |
| times[0].tv_nsec = UTIME_OMIT; |
| } |
| if (v9stat.mtime != -1) { |
| times[1].tv_sec = v9stat.mtime; |
| times[1].tv_nsec = 0; |
| } else { |
| times[1].tv_nsec = UTIME_OMIT; |
| } |
| err = v9fs_co_utimensat(pdu, &fidp->path, times); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| if (v9stat.n_gid != -1 || v9stat.n_uid != -1) { |
| err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| if (v9stat.name.size != 0) { |
| v9fs_path_write_lock(s); |
| err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name); |
| v9fs_path_unlock(s); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| if (v9stat.length != -1) { |
| err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length); |
| if (err < 0) { |
| goto out; |
| } |
| } |
| err = offset; |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| v9fs_stat_free(&v9stat); |
| pdu_complete(pdu, err); |
| } |
| |
| static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf) |
| { |
| uint32_t f_type; |
| uint32_t f_bsize; |
| uint64_t f_blocks; |
| uint64_t f_bfree; |
| uint64_t f_bavail; |
| uint64_t f_files; |
| uint64_t f_ffree; |
| uint64_t fsid_val; |
| uint32_t f_namelen; |
| size_t offset = 7; |
| int32_t bsize_factor; |
| |
| /* |
| * compute bsize factor based on host file system block size |
| * and client msize |
| */ |
| bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize; |
| if (!bsize_factor) { |
| bsize_factor = 1; |
| } |
| f_type = stbuf->f_type; |
| f_bsize = stbuf->f_bsize; |
| f_bsize *= bsize_factor; |
| /* |
| * f_bsize is adjusted(multiplied) by bsize factor, so we need to |
| * adjust(divide) the number of blocks, free blocks and available |
| * blocks by bsize factor |
| */ |
| f_blocks = stbuf->f_blocks/bsize_factor; |
| f_bfree = stbuf->f_bfree/bsize_factor; |
| f_bavail = stbuf->f_bavail/bsize_factor; |
| f_files = stbuf->f_files; |
| f_ffree = stbuf->f_ffree; |
| fsid_val = (unsigned int) stbuf->f_fsid.__val[0] | |
| (unsigned long long)stbuf->f_fsid.__val[1] << 32; |
| f_namelen = stbuf->f_namelen; |
| |
| return pdu_marshal(pdu, offset, "ddqqqqqqd", |
| f_type, f_bsize, f_blocks, f_bfree, |
| f_bavail, f_files, f_ffree, |
| fsid_val, f_namelen); |
| } |
| |
| static void coroutine_fn v9fs_statfs(void *opaque) |
| { |
| int32_t fid; |
| ssize_t retval = 0; |
| size_t offset = 7; |
| V9fsFidState *fidp; |
| struct statfs stbuf; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| retval = pdu_unmarshal(pdu, offset, "d", &fid); |
| if (retval < 0) { |
| goto out_nofid; |
| } |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| retval = -ENOENT; |
| goto out_nofid; |
| } |
| retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf); |
| if (retval < 0) { |
| goto out; |
| } |
| retval = v9fs_fill_statfs(s, pdu, &stbuf); |
| if (retval < 0) { |
| goto out; |
| } |
| retval += offset; |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, retval); |
| } |
| |
| static void coroutine_fn v9fs_mknod(void *opaque) |
| { |
| |
| int mode; |
| gid_t gid; |
| int32_t fid; |
| V9fsQID qid; |
| int err = 0; |
| int major, minor; |
| size_t offset = 7; |
| V9fsString name; |
| struct stat stbuf; |
| V9fsFidState *fidp; |
| V9fsPDU *pdu = opaque; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode, |
| &major, &minor, &gid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor); |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
| err = -EEXIST; |
| goto out_nofid; |
| } |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid, |
| makedev(major, minor), mode, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = stat_to_qid(pdu, &stbuf, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "Q", &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_mknod_return(pdu->tag, pdu->id, |
| qid.type, qid.version, qid.path); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| } |
| |
| /* |
| * Implement posix byte range locking code |
| * Server side handling of locking code is very simple, because 9p server in |
| * QEMU can handle only one client. And most of the lock handling |
| * (like conflict, merging) etc is done by the VFS layer itself, so no need to |
| * do any thing in * qemu 9p server side lock code path. |
| * So when a TLOCK request comes, always return success |
| */ |
| static void coroutine_fn v9fs_lock(void *opaque) |
| { |
| V9fsFlock flock; |
| size_t offset = 7; |
| struct stat stbuf; |
| V9fsFidState *fidp; |
| int32_t fid, err = 0; |
| V9fsPDU *pdu = opaque; |
| |
| v9fs_string_init(&flock.client_id); |
| err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type, |
| &flock.flags, &flock.start, &flock.length, |
| &flock.proc_id, &flock.client_id); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_lock(pdu->tag, pdu->id, fid, |
| flock.type, flock.start, flock.length); |
| |
| |
| /* We support only block flag now (that too ignored currently) */ |
| if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| err = v9fs_co_fstat(pdu, fidp, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "b", P9_LOCK_SUCCESS); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_lock_return(pdu->tag, pdu->id, P9_LOCK_SUCCESS); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&flock.client_id); |
| } |
| |
| /* |
| * When a TGETLOCK request comes, always return success because all lock |
| * handling is done by client's VFS layer. |
| */ |
| static void coroutine_fn v9fs_getlock(void *opaque) |
| { |
| size_t offset = 7; |
| struct stat stbuf; |
| V9fsFidState *fidp; |
| V9fsGetlock glock; |
| int32_t fid, err = 0; |
| V9fsPDU *pdu = opaque; |
| |
| v9fs_string_init(&glock.client_id); |
| err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type, |
| &glock.start, &glock.length, &glock.proc_id, |
| &glock.client_id); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_getlock(pdu->tag, pdu->id, fid, |
| glock.type, glock.start, glock.length); |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| err = v9fs_co_fstat(pdu, fidp, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| glock.type = P9_LOCK_TYPE_UNLCK; |
| err = pdu_marshal(pdu, offset, "bqqds", glock.type, |
| glock.start, glock.length, glock.proc_id, |
| &glock.client_id); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start, |
| glock.length, glock.proc_id); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&glock.client_id); |
| } |
| |
| static void coroutine_fn v9fs_mkdir(void *opaque) |
| { |
| V9fsPDU *pdu = opaque; |
| size_t offset = 7; |
| int32_t fid; |
| struct stat stbuf; |
| V9fsQID qid; |
| V9fsString name; |
| V9fsFidState *fidp; |
| gid_t gid; |
| int mode; |
| int err = 0; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid); |
| |
| if (name_is_illegal(name.data)) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| if (!strcmp(".", name.data) || !strcmp("..", name.data)) { |
| err = -EEXIST; |
| goto out_nofid; |
| } |
| |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf); |
| if (err < 0) { |
| goto out; |
| } |
| err = stat_to_qid(pdu, &stbuf, &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "Q", &qid); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_mkdir_return(pdu->tag, pdu->id, |
| qid.type, qid.version, qid.path, err); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| } |
| |
| static void coroutine_fn v9fs_xattrwalk(void *opaque) |
| { |
| int64_t size; |
| V9fsString name; |
| ssize_t err = 0; |
| size_t offset = 7; |
| int32_t fid, newfid; |
| V9fsFidState *file_fidp; |
| V9fsFidState *xattr_fidp = NULL; |
| V9fsPDU *pdu = opaque; |
| V9fsState *s = pdu->s; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data); |
| |
| file_fidp = get_fid(pdu, fid); |
| if (file_fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| xattr_fidp = alloc_fid(s, newfid); |
| if (xattr_fidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| v9fs_path_copy(&xattr_fidp->path, &file_fidp->path); |
| if (!v9fs_string_size(&name)) { |
| /* |
| * listxattr request. Get the size first |
| */ |
| size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0); |
| if (size < 0) { |
| err = size; |
| clunk_fid(s, xattr_fidp->fid); |
| goto out; |
| } |
| /* |
| * Read the xattr value |
| */ |
| xattr_fidp->fs.xattr.len = size; |
| xattr_fidp->fid_type = P9_FID_XATTR; |
| xattr_fidp->fs.xattr.xattrwalk_fid = true; |
| xattr_fidp->fs.xattr.value = g_malloc0(size); |
| if (size) { |
| err = v9fs_co_llistxattr(pdu, &xattr_fidp->path, |
| xattr_fidp->fs.xattr.value, |
| xattr_fidp->fs.xattr.len); |
| if (err < 0) { |
| clunk_fid(s, xattr_fidp->fid); |
| goto out; |
| } |
| } |
| err = pdu_marshal(pdu, offset, "q", size); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| } else { |
| /* |
| * specific xattr fid. We check for xattr |
| * presence also collect the xattr size |
| */ |
| size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
| &name, NULL, 0); |
| if (size < 0) { |
| err = size; |
| clunk_fid(s, xattr_fidp->fid); |
| goto out; |
| } |
| /* |
| * Read the xattr value |
| */ |
| xattr_fidp->fs.xattr.len = size; |
| xattr_fidp->fid_type = P9_FID_XATTR; |
| xattr_fidp->fs.xattr.xattrwalk_fid = true; |
| xattr_fidp->fs.xattr.value = g_malloc0(size); |
| if (size) { |
| err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path, |
| &name, xattr_fidp->fs.xattr.value, |
| xattr_fidp->fs.xattr.len); |
| if (err < 0) { |
| clunk_fid(s, xattr_fidp->fid); |
| goto out; |
| } |
| } |
| err = pdu_marshal(pdu, offset, "q", size); |
| if (err < 0) { |
| goto out; |
| } |
| err += offset; |
| } |
| trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size); |
| out: |
| put_fid(pdu, file_fidp); |
| if (xattr_fidp) { |
| put_fid(pdu, xattr_fidp); |
| } |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| } |
| |
| static void coroutine_fn v9fs_xattrcreate(void *opaque) |
| { |
| int flags, rflags = 0; |
| int32_t fid; |
| uint64_t size; |
| ssize_t err = 0; |
| V9fsString name; |
| size_t offset = 7; |
| V9fsFidState *file_fidp; |
| V9fsFidState *xattr_fidp; |
| V9fsPDU *pdu = opaque; |
| |
| v9fs_string_init(&name); |
| err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags); |
| |
| if (flags & ~(P9_XATTR_CREATE | P9_XATTR_REPLACE)) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| |
| if (flags & P9_XATTR_CREATE) { |
| rflags |= XATTR_CREATE; |
| } |
| |
| if (flags & P9_XATTR_REPLACE) { |
| rflags |= XATTR_REPLACE; |
| } |
| |
| if (size > XATTR_SIZE_MAX) { |
| err = -E2BIG; |
| goto out_nofid; |
| } |
| |
| file_fidp = get_fid(pdu, fid); |
| if (file_fidp == NULL) { |
| err = -EINVAL; |
| goto out_nofid; |
| } |
| if (file_fidp->fid_type != P9_FID_NONE) { |
| err = -EINVAL; |
| goto out_put_fid; |
| } |
| |
| /* Make the file fid point to xattr */ |
| xattr_fidp = file_fidp; |
| xattr_fidp->fid_type = P9_FID_XATTR; |
| xattr_fidp->fs.xattr.copied_len = 0; |
| xattr_fidp->fs.xattr.xattrwalk_fid = false; |
| xattr_fidp->fs.xattr.len = size; |
| xattr_fidp->fs.xattr.flags = rflags; |
| v9fs_string_init(&xattr_fidp->fs.xattr.name); |
| v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name); |
| xattr_fidp->fs.xattr.value = g_malloc0(size); |
| err = offset; |
| out_put_fid: |
| put_fid(pdu, file_fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| v9fs_string_free(&name); |
| } |
| |
| static void coroutine_fn v9fs_readlink(void *opaque) |
| { |
| V9fsPDU *pdu = opaque; |
| size_t offset = 7; |
| V9fsString target; |
| int32_t fid; |
| int err = 0; |
| V9fsFidState *fidp; |
| |
| err = pdu_unmarshal(pdu, offset, "d", &fid); |
| if (err < 0) { |
| goto out_nofid; |
| } |
| trace_v9fs_readlink(pdu->tag, pdu->id, fid); |
| fidp = get_fid(pdu, fid); |
| if (fidp == NULL) { |
| err = -ENOENT; |
| goto out_nofid; |
| } |
| |
| v9fs_string_init(&target); |
| err = v9fs_co_readlink(pdu, &fidp->path, &target); |
| if (err < 0) { |
| goto out; |
| } |
| err = pdu_marshal(pdu, offset, "s", &target); |
| if (err < 0) { |
| v9fs_string_free(&target); |
| goto out; |
| } |
| err += offset; |
| trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data); |
| v9fs_string_free(&target); |
| out: |
| put_fid(pdu, fidp); |
| out_nofid: |
| pdu_complete(pdu, err); |
| } |
| |
| static CoroutineEntry *pdu_co_handlers[] = { |
| [P9_TREADDIR] = v9fs_readdir, |
| [P9_TSTATFS] = v9fs_statfs, |
| [P9_TGETATTR] = v9fs_getattr, |
| [P9_TSETATTR] = v9fs_setattr, |
| [P9_TXATTRWALK] = v9fs_xattrwalk, |
| [P9_TXATTRCREATE] = v9fs_xattrcreate, |
| [P9_TMKNOD] = v9fs_mknod, |
| [P9_TRENAME] = v9fs_rename, |
| [P9_TLOCK] = v9fs_lock, |
| [P9_TGETLOCK] = v9fs_getlock, |
| [P9_TRENAMEAT] = v9fs_renameat, |
| [P9_TREADLINK] = v9fs_readlink, |
| [P9_TUNLINKAT] = v9fs_unlinkat, |
| [P9_TMKDIR] = v9fs_mkdir, |
| [P9_TVERSION] = v9fs_version, |
| [P9_TLOPEN] = v9fs_open, |
| [P9_TATTACH] = v9fs_attach, |
| [P9_TSTAT] = v9fs_stat, |
| [P9_TWALK] = v9fs_walk, |
| [P9_TCLUNK] = v9fs_clunk, |
| [P9_TFSYNC] = v9fs_fsync, |
| [P9_TOPEN] = v9fs_open, |
| [P9_TREAD] = v9fs_read, |
| #if 0 |
| [P9_TAUTH] = v9fs_auth, |
| #endif |
| [P9_TFLUSH] = v9fs_flush, |
| [P9_TLINK] = v9fs_link, |
| [P9_TSYMLINK] = v9fs_symlink, |
| [P9_TCREATE] = v9fs_create, |
| [P9_TLCREATE] = v9fs_lcreate, |
| [P9_TWRITE] = v9fs_write, |
| [P9_TWSTAT] = v9fs_wstat, |
| [P9_TREMOVE] = v9fs_remove, |
| }; |
| |
| static void coroutine_fn v9fs_op_not_supp(void *opaque) |
| { |
| V9fsPDU *pdu = opaque; |
| pdu_complete(pdu, -EOPNOTSUPP); |
| } |
| |
| static void coroutine_fn v9fs_fs_ro(void *opaque) |
| { |
| V9fsPDU *pdu = opaque; |
| pdu_complete(pdu, -EROFS); |
| } |
| |
| static inline bool is_read_only_op(V9fsPDU *pdu) |
| { |
| switch (pdu->id) { |
| case P9_TREADDIR: |
| case P9_TSTATFS: |
| case P9_TGETATTR: |
| case P9_TXATTRWALK: |
| case P9_TLOCK: |
| case P9_TGETLOCK: |
| case P9_TREADLINK: |
| case P9_TVERSION: |
| case P9_TLOPEN: |
| case P9_TATTACH: |
| case P9_TSTAT: |
| case P9_TWALK: |
| case P9_TCLUNK: |
| case P9_TFSYNC: |
| case P9_TOPEN: |
| case P9_TREAD: |
| case P9_TAUTH: |
| case P9_TFLUSH: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr) |
| { |
| Coroutine *co; |
| CoroutineEntry *handler; |
| V9fsState *s = pdu->s; |
| |
| pdu->size = le32_to_cpu(hdr->size_le); |
| pdu->id = hdr->id; |
| pdu->tag = le16_to_cpu(hdr->tag_le); |
| |
| if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) || |
| (pdu_co_handlers[pdu->id] == NULL)) { |
| handler = v9fs_op_not_supp; |
| } else if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) { |
| handler = v9fs_fs_ro; |
| } else { |
| handler = pdu_co_handlers[pdu->id]; |
| } |
| |
| qemu_co_queue_init(&pdu->complete); |
| co = qemu_coroutine_create(handler, pdu); |
| qemu_coroutine_enter(co); |
| } |
| |
| /* Returns 0 on success, 1 on failure. */ |
| int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t, |
| Error **errp) |
| { |
| ERRP_GUARD(); |
| int i, len; |
| struct stat stat; |
| FsDriverEntry *fse; |
| V9fsPath path; |
| int rc = 1; |
| |
| assert(!s->transport); |
| s->transport = t; |
| |
| /* initialize pdu allocator */ |
| QLIST_INIT(&s->free_list); |
| QLIST_INIT(&s->active_list); |
| for (i = 0; i < MAX_REQ; i++) { |
| QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
| s->pdus[i].s = s; |
| s->pdus[i].idx = i; |
| } |
| |
| v9fs_path_init(&path); |
| |
| fse = get_fsdev_fsentry(s->fsconf.fsdev_id); |
| |
| if (!fse) { |
| /* We don't have a fsdev identified by fsdev_id */ |
| error_setg(errp, "9pfs device couldn't find fsdev with the " |
| "id = %s", |
| s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL"); |
| goto out; |
| } |
| |
| if (!s->fsconf.tag) { |
| /* we haven't specified a mount_tag */ |
| error_setg(errp, "fsdev with id %s needs mount_tag arguments", |
| s->fsconf.fsdev_id); |
| goto out; |
| } |
| |
| s->ctx.export_flags = fse->export_flags; |
| s->ctx.fs_root = g_strdup(fse->path); |
| s->ctx.exops.get_st_gen = NULL; |
| len = strlen(s->fsconf.tag); |
| if (len > MAX_TAG_LEN - 1) { |
| error_setg(errp, "mount tag '%s' (%d bytes) is longer than " |
| "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1); |
| goto out; |
| } |
| |
| s->tag = g_strdup(s->fsconf.tag); |
| s->ctx.uid = -1; |
| |
| s->ops = fse->ops; |
| |
| s->ctx.fmode = fse->fmode; |
| s->ctx.dmode = fse->dmode; |
| |
| s->fid_list = NULL; |
| qemu_co_rwlock_init(&s->rename_lock); |
| |
| if (s->ops->init(&s->ctx, errp) < 0) { |
| error_prepend(errp, "cannot initialize fsdev '%s': ", |
| s->fsconf.fsdev_id); |
| goto out; |
| } |
| |
| /* |
| * Check details of export path, We need to use fs driver |
| * call back to do that. Since we are in the init path, we don't |
| * use co-routines here. |
| */ |
| if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { |
| error_setg(errp, |
| "error in converting name to path %s", strerror(errno)); |
| goto out; |
| } |
| if (s->ops->lstat(&s->ctx, &path, &stat)) { |
| error_setg(errp, "share path %s does not exist", fse->path); |
| goto out; |
| } else if (!S_ISDIR(stat.st_mode)) { |
| error_setg(errp, "share path %s is not a directory", fse->path); |
| goto out; |
| } |
| |
| s->dev_id = stat.st_dev; |
| |
| /* init inode remapping : */ |
| /* hash table for variable length inode suffixes */ |
| qpd_table_init(&s->qpd_table); |
| /* hash table for slow/full inode remapping (most users won't need it) */ |
| qpf_table_init(&s->qpf_table); |
| /* hash table for quick inode remapping */ |
| qpp_table_init(&s->qpp_table); |
| s->qp_ndevices = 0; |
| s->qp_affix_next = 1; /* reserve 0 to detect overflow */ |
| s->qp_fullpath_next = 1; |
| |
| s->ctx.fst = &fse->fst; |
| fsdev_throttle_init(s->ctx.fst); |
| |
| rc = 0; |
| out: |
| if (rc) { |
| v9fs_device_unrealize_common(s); |
| } |
| v9fs_path_free(&path); |
| return rc; |
| } |
| |
| void v9fs_device_unrealize_common(V9fsState *s) |
| { |
| if (s->ops && s->ops->cleanup) { |
| s->ops->cleanup(&s->ctx); |
| } |
| if (s->ctx.fst) { |
| fsdev_throttle_cleanup(s->ctx.fst); |
| } |
| g_free(s->tag); |
| qp_table_destroy(&s->qpd_table); |
| qp_table_destroy(&s->qpp_table); |
| qp_table_destroy(&s->qpf_table); |
| g_free(s->ctx.fs_root); |
| } |
| |
| typedef struct VirtfsCoResetData { |
| V9fsPDU pdu; |
| bool done; |
| } VirtfsCoResetData; |
| |
| static void coroutine_fn virtfs_co_reset(void *opaque) |
| { |
| VirtfsCoResetData *data = opaque; |
| |
| virtfs_reset(&data->pdu); |
| data->done = true; |
| } |
| |
| void v9fs_reset(V9fsState *s) |
| { |
| VirtfsCoResetData data = { .pdu = { .s = s }, .done = false }; |
| Coroutine *co; |
| |
| while (!QLIST_EMPTY(&s->active_list)) { |
| aio_poll(qemu_get_aio_context(), true); |
| } |
| |
| co = qemu_coroutine_create(virtfs_co_reset, &data); |
| qemu_coroutine_enter(co); |
| |
| while (!data.done) { |
| aio_poll(qemu_get_aio_context(), true); |
| } |
| } |
| |
| static void __attribute__((__constructor__)) v9fs_set_fd_limit(void) |
| { |
| struct rlimit rlim; |
| if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { |
| error_report("Failed to get the resource limit"); |
| exit(1); |
| } |
| open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3); |
| open_fd_rc = rlim.rlim_cur/2; |
| } |