4 * Copyright IBM, Corp. 2010
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #include "hw/virtio/virtio.h"
15 #include "hw/i386/pc.h"
16 #include "qemu/error-report.h"
18 #include "qemu/sockets.h"
19 #include "virtio-9p.h"
20 #include "fsdev/qemu-fsdev.h"
21 #include "virtio-9p-xattr.h"
22 #include "virtio-9p-coth.h"
24 #include "migration/migration.h"
28 static int open_fd_rc;
42 static int omode_to_uflags(int8_t mode)
76 struct dotl_openflag_map {
81 static int dotl_to_open_flags(int flags)
85 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
86 * and P9_DOTL_NOACCESS
88 int oflags = flags & O_ACCMODE;
90 struct dotl_openflag_map dotl_oflag_map[] = {
91 { P9_DOTL_CREATE, O_CREAT },
92 { P9_DOTL_EXCL, O_EXCL },
93 { P9_DOTL_NOCTTY , O_NOCTTY },
94 { P9_DOTL_TRUNC, O_TRUNC },
95 { P9_DOTL_APPEND, O_APPEND },
96 { P9_DOTL_NONBLOCK, O_NONBLOCK } ,
97 { P9_DOTL_DSYNC, O_DSYNC },
98 { P9_DOTL_FASYNC, FASYNC },
99 { P9_DOTL_DIRECT, O_DIRECT },
100 { P9_DOTL_LARGEFILE, O_LARGEFILE },
101 { P9_DOTL_DIRECTORY, O_DIRECTORY },
102 { P9_DOTL_NOFOLLOW, O_NOFOLLOW },
103 { P9_DOTL_NOATIME, O_NOATIME },
104 { P9_DOTL_SYNC, O_SYNC },
107 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
108 if (flags & dotl_oflag_map[i].dotl_flag) {
109 oflags |= dotl_oflag_map[i].open_flag;
116 void cred_init(FsCred *credp)
124 static int get_dotl_openflags(V9fsState *s, int oflags)
128 * Filter the client open flags
130 flags = dotl_to_open_flags(oflags);
131 flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
133 * Ignore direct disk access hint until the server supports it.
139 void v9fs_path_init(V9fsPath *path)
145 void v9fs_path_free(V9fsPath *path)
152 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs)
155 lhs->data = g_malloc(rhs->size);
156 memcpy(lhs->data, rhs->data, rhs->size);
157 lhs->size = rhs->size;
160 int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
161 const char *name, V9fsPath *path)
164 err = s->ops->name_to_path(&s->ctx, dirpath, name, path);
172 * Return TRUE if s1 is an ancestor of s2.
174 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
175 * As a special case, We treat s1 as ancestor of s2 if they are same!
177 static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2)
179 if (!strncmp(s1->data, s2->data, s1->size - 1)) {
180 if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') {
187 static size_t v9fs_string_size(V9fsString *str)
193 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
194 static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
197 if (f->fid_type == P9_FID_FILE) {
198 if (f->fs.fd == -1) {
200 err = v9fs_co_open(pdu, f, f->open_flags);
201 } while (err == -EINTR && !pdu->cancelled);
203 } else if (f->fid_type == P9_FID_DIR) {
204 if (f->fs.dir == NULL) {
206 err = v9fs_co_opendir(pdu, f);
207 } while (err == -EINTR && !pdu->cancelled);
213 static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid)
217 V9fsState *s = pdu->s;
219 for (f = s->fid_list; f; f = f->next) {
223 * Update the fid ref upfront so that
224 * we don't get reclaimed when we yield
229 * check whether we need to reopen the
230 * file. We might have closed the fd
231 * while trying to free up some file
234 err = v9fs_reopen_fid(pdu, f);
240 * Mark the fid as referenced so that the LRU
241 * reclaim won't close the file descriptor
243 f->flags |= FID_REFERENCED;
250 static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
254 for (f = s->fid_list; f; f = f->next) {
255 /* If fid is already there return NULL */
261 f = g_malloc0(sizeof(V9fsFidState));
263 f->fid_type = P9_FID_NONE;
266 * Mark the fid as referenced so that the LRU
267 * reclaim won't close the file descriptor
269 f->flags |= FID_REFERENCED;
270 f->next = s->fid_list;
276 static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
280 if (fidp->fs.xattr.copied_len == -1) {
281 /* getxattr/listxattr fid */
285 * if this is fid for setxattr. clunk should
286 * result in setxattr localcall
288 if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
289 /* clunk after partial write */
293 if (fidp->fs.xattr.len) {
294 retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name,
295 fidp->fs.xattr.value,
297 fidp->fs.xattr.flags);
299 retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name);
302 v9fs_string_free(&fidp->fs.xattr.name);
304 g_free(fidp->fs.xattr.value);
308 static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
312 if (fidp->fid_type == P9_FID_FILE) {
313 /* If we reclaimed the fd no need to close */
314 if (fidp->fs.fd != -1) {
315 retval = v9fs_co_close(pdu, &fidp->fs);
317 } else if (fidp->fid_type == P9_FID_DIR) {
318 if (fidp->fs.dir != NULL) {
319 retval = v9fs_co_closedir(pdu, &fidp->fs);
321 } else if (fidp->fid_type == P9_FID_XATTR) {
322 retval = v9fs_xattr_fid_clunk(pdu, fidp);
324 v9fs_path_free(&fidp->path);
329 static int put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
334 * Don't free the fid if it is in reclaim list
336 if (!fidp->ref && fidp->clunked) {
337 if (fidp->fid == pdu->s->root_fid) {
339 * if the clunked fid is root fid then we
340 * have unmounted the fs on the client side.
341 * delete the migration blocker. Ideally, this
342 * should be hooked to transport close notification
344 if (pdu->s->migration_blocker) {
345 migrate_del_blocker(pdu->s->migration_blocker);
346 error_free(pdu->s->migration_blocker);
347 pdu->s->migration_blocker = NULL;
350 return free_fid(pdu, fidp);
355 static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid)
357 V9fsFidState **fidpp, *fidp;
359 for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
360 if ((*fidpp)->fid == fid) {
364 if (*fidpp == NULL) {
373 void v9fs_reclaim_fd(V9fsPDU *pdu)
375 int reclaim_count = 0;
376 V9fsState *s = pdu->s;
377 V9fsFidState *f, *reclaim_list = NULL;
379 for (f = s->fid_list; f; f = f->next) {
381 * Unlink fids cannot be reclaimed. Check
382 * for them and skip them. Also skip fids
383 * currently being operated on.
385 if (f->ref || f->flags & FID_NON_RECLAIMABLE) {
389 * if it is a recently referenced fid
390 * we leave the fid untouched and clear the
391 * reference bit. We come back to it later
392 * in the next iteration. (a simple LRU without
393 * moving list elements around)
395 if (f->flags & FID_REFERENCED) {
396 f->flags &= ~FID_REFERENCED;
400 * Add fids to reclaim list.
402 if (f->fid_type == P9_FID_FILE) {
403 if (f->fs.fd != -1) {
405 * Up the reference count so that
406 * a clunk request won't free this fid
409 f->rclm_lst = reclaim_list;
411 f->fs_reclaim.fd = f->fs.fd;
415 } else if (f->fid_type == P9_FID_DIR) {
416 if (f->fs.dir != NULL) {
418 * Up the reference count so that
419 * a clunk request won't free this fid
422 f->rclm_lst = reclaim_list;
424 f->fs_reclaim.dir = f->fs.dir;
429 if (reclaim_count >= open_fd_rc) {
434 * Now close the fid in reclaim list. Free them if they
435 * are already clunked.
437 while (reclaim_list) {
439 reclaim_list = f->rclm_lst;
440 if (f->fid_type == P9_FID_FILE) {
441 v9fs_co_close(pdu, &f->fs_reclaim);
442 } else if (f->fid_type == P9_FID_DIR) {
443 v9fs_co_closedir(pdu, &f->fs_reclaim);
447 * Now drop the fid reference, free it
454 static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
457 V9fsState *s = pdu->s;
458 V9fsFidState *fidp, head_fid;
460 head_fid.next = s->fid_list;
461 for (fidp = s->fid_list; fidp; fidp = fidp->next) {
462 if (fidp->path.size != path->size) {
465 if (!memcmp(fidp->path.data, path->data, path->size)) {
466 /* Mark the fid non reclaimable. */
467 fidp->flags |= FID_NON_RECLAIMABLE;
469 /* reopen the file/dir if already closed */
470 err = v9fs_reopen_fid(pdu, fidp);
475 * Go back to head of fid list because
476 * the list could have got updated when
477 * switched to the worker thread
487 static void virtfs_reset(V9fsPDU *pdu)
489 V9fsState *s = pdu->s;
490 V9fsFidState *fidp = NULL;
493 while (s->fid_list) {
495 s->fid_list = fidp->next;
504 /* One or more unclunked fids found... */
505 error_report("9pfs:%s: One or more uncluncked fids "
506 "found during reset", __func__);
510 #define P9_QID_TYPE_DIR 0x80
511 #define P9_QID_TYPE_SYMLINK 0x02
513 #define P9_STAT_MODE_DIR 0x80000000
514 #define P9_STAT_MODE_APPEND 0x40000000
515 #define P9_STAT_MODE_EXCL 0x20000000
516 #define P9_STAT_MODE_MOUNT 0x10000000
517 #define P9_STAT_MODE_AUTH 0x08000000
518 #define P9_STAT_MODE_TMP 0x04000000
519 #define P9_STAT_MODE_SYMLINK 0x02000000
520 #define P9_STAT_MODE_LINK 0x01000000
521 #define P9_STAT_MODE_DEVICE 0x00800000
522 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
523 #define P9_STAT_MODE_SOCKET 0x00100000
524 #define P9_STAT_MODE_SETUID 0x00080000
525 #define P9_STAT_MODE_SETGID 0x00040000
526 #define P9_STAT_MODE_SETVTX 0x00010000
528 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
529 P9_STAT_MODE_SYMLINK | \
530 P9_STAT_MODE_LINK | \
531 P9_STAT_MODE_DEVICE | \
532 P9_STAT_MODE_NAMED_PIPE | \
535 /* This is the algorithm from ufs in spfs */
536 static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
540 memset(&qidp->path, 0, sizeof(qidp->path));
541 size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
542 memcpy(&qidp->path, &stbuf->st_ino, size);
543 qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
545 if (S_ISDIR(stbuf->st_mode)) {
546 qidp->type |= P9_QID_TYPE_DIR;
548 if (S_ISLNK(stbuf->st_mode)) {
549 qidp->type |= P9_QID_TYPE_SYMLINK;
553 static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp)
558 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
562 stat_to_qid(&stbuf, qidp);
566 static V9fsPDU *alloc_pdu(V9fsState *s)
570 if (!QLIST_EMPTY(&s->free_list)) {
571 pdu = QLIST_FIRST(&s->free_list);
572 QLIST_REMOVE(pdu, next);
573 QLIST_INSERT_HEAD(&s->active_list, pdu, next);
578 static void free_pdu(V9fsState *s, V9fsPDU *pdu)
582 * Cancelled pdu are added back to the freelist
585 if (!pdu->cancelled) {
586 QLIST_REMOVE(pdu, next);
587 QLIST_INSERT_HEAD(&s->free_list, pdu, next);
593 * We don't do error checking for pdu_marshal/unmarshal here
594 * because we always expect to have enough space to encode
597 static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
599 int8_t id = pdu->id + 1; /* Response */
605 if (s->proto_version != V9FS_PROTO_2000L) {
608 str.data = strerror(err);
609 str.size = strlen(str.data);
611 len += pdu_marshal(pdu, len, "s", &str);
615 len += pdu_marshal(pdu, len, "d", err);
617 if (s->proto_version == V9FS_PROTO_2000L) {
620 trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */
623 /* fill out the header */
624 pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
626 /* keep these in sync */
630 /* push onto queue and notify */
631 virtqueue_push(s->vq, &pdu->elem, len);
633 /* FIXME: we should batch these completions */
634 virtio_notify(VIRTIO_DEVICE(s), s->vq);
636 /* Now wakeup anybody waiting in flush for this request */
637 qemu_co_queue_next(&pdu->complete);
642 static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
647 if (mode & P9_STAT_MODE_DIR) {
651 if (mode & P9_STAT_MODE_SYMLINK) {
654 if (mode & P9_STAT_MODE_SOCKET) {
657 if (mode & P9_STAT_MODE_NAMED_PIPE) {
660 if (mode & P9_STAT_MODE_DEVICE) {
661 if (extension->size && extension->data[0] == 'c') {
672 if (mode & P9_STAT_MODE_SETUID) {
675 if (mode & P9_STAT_MODE_SETGID) {
678 if (mode & P9_STAT_MODE_SETVTX) {
685 static int donttouch_stat(V9fsStat *stat)
687 if (stat->type == -1 &&
689 stat->qid.type == -1 &&
690 stat->qid.version == -1 &&
691 stat->qid.path == -1 &&
695 stat->length == -1 &&
702 stat->n_muid == -1) {
709 static void v9fs_stat_init(V9fsStat *stat)
711 v9fs_string_init(&stat->name);
712 v9fs_string_init(&stat->uid);
713 v9fs_string_init(&stat->gid);
714 v9fs_string_init(&stat->muid);
715 v9fs_string_init(&stat->extension);
718 static void v9fs_stat_free(V9fsStat *stat)
720 v9fs_string_free(&stat->name);
721 v9fs_string_free(&stat->uid);
722 v9fs_string_free(&stat->gid);
723 v9fs_string_free(&stat->muid);
724 v9fs_string_free(&stat->extension);
727 static uint32_t stat_to_v9mode(const struct stat *stbuf)
731 mode = stbuf->st_mode & 0777;
732 if (S_ISDIR(stbuf->st_mode)) {
733 mode |= P9_STAT_MODE_DIR;
736 if (S_ISLNK(stbuf->st_mode)) {
737 mode |= P9_STAT_MODE_SYMLINK;
740 if (S_ISSOCK(stbuf->st_mode)) {
741 mode |= P9_STAT_MODE_SOCKET;
744 if (S_ISFIFO(stbuf->st_mode)) {
745 mode |= P9_STAT_MODE_NAMED_PIPE;
748 if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
749 mode |= P9_STAT_MODE_DEVICE;
752 if (stbuf->st_mode & S_ISUID) {
753 mode |= P9_STAT_MODE_SETUID;
756 if (stbuf->st_mode & S_ISGID) {
757 mode |= P9_STAT_MODE_SETGID;
760 if (stbuf->st_mode & S_ISVTX) {
761 mode |= P9_STAT_MODE_SETVTX;
767 static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
768 const struct stat *stbuf,
774 memset(v9stat, 0, sizeof(*v9stat));
776 stat_to_qid(stbuf, &v9stat->qid);
777 v9stat->mode = stat_to_v9mode(stbuf);
778 v9stat->atime = stbuf->st_atime;
779 v9stat->mtime = stbuf->st_mtime;
780 v9stat->length = stbuf->st_size;
782 v9fs_string_null(&v9stat->uid);
783 v9fs_string_null(&v9stat->gid);
784 v9fs_string_null(&v9stat->muid);
786 v9stat->n_uid = stbuf->st_uid;
787 v9stat->n_gid = stbuf->st_gid;
790 v9fs_string_null(&v9stat->extension);
792 if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
793 err = v9fs_co_readlink(pdu, name, &v9stat->extension);
797 } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
798 v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
799 S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
800 major(stbuf->st_rdev), minor(stbuf->st_rdev));
801 } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
802 v9fs_string_sprintf(&v9stat->extension, "%s %lu",
803 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
806 str = strrchr(name->data, '/');
813 v9fs_string_sprintf(&v9stat->name, "%s", str);
816 v9fs_string_size(&v9stat->name) +
817 v9fs_string_size(&v9stat->uid) +
818 v9fs_string_size(&v9stat->gid) +
819 v9fs_string_size(&v9stat->muid) +
820 v9fs_string_size(&v9stat->extension);
824 #define P9_STATS_MODE 0x00000001ULL
825 #define P9_STATS_NLINK 0x00000002ULL
826 #define P9_STATS_UID 0x00000004ULL
827 #define P9_STATS_GID 0x00000008ULL
828 #define P9_STATS_RDEV 0x00000010ULL
829 #define P9_STATS_ATIME 0x00000020ULL
830 #define P9_STATS_MTIME 0x00000040ULL
831 #define P9_STATS_CTIME 0x00000080ULL
832 #define P9_STATS_INO 0x00000100ULL
833 #define P9_STATS_SIZE 0x00000200ULL
834 #define P9_STATS_BLOCKS 0x00000400ULL
836 #define P9_STATS_BTIME 0x00000800ULL
837 #define P9_STATS_GEN 0x00001000ULL
838 #define P9_STATS_DATA_VERSION 0x00002000ULL
840 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
841 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
844 static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
845 V9fsStatDotl *v9lstat)
847 memset(v9lstat, 0, sizeof(*v9lstat));
849 v9lstat->st_mode = stbuf->st_mode;
850 v9lstat->st_nlink = stbuf->st_nlink;
851 v9lstat->st_uid = stbuf->st_uid;
852 v9lstat->st_gid = stbuf->st_gid;
853 v9lstat->st_rdev = stbuf->st_rdev;
854 v9lstat->st_size = stbuf->st_size;
855 v9lstat->st_blksize = stbuf->st_blksize;
856 v9lstat->st_blocks = stbuf->st_blocks;
857 v9lstat->st_atime_sec = stbuf->st_atime;
858 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
859 v9lstat->st_mtime_sec = stbuf->st_mtime;
860 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
861 v9lstat->st_ctime_sec = stbuf->st_ctime;
862 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
863 /* Currently we only support BASIC fields in stat */
864 v9lstat->st_result_mask = P9_STATS_BASIC;
866 stat_to_qid(stbuf, &v9lstat->qid);
869 static void print_sg(struct iovec *sg, int cnt)
873 printf("sg[%d]: {", cnt);
874 for (i = 0; i < cnt; i++) {
878 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
883 /* Will call this only for path name based fid */
884 static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
887 v9fs_path_init(&str);
888 v9fs_path_copy(&str, dst);
889 v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len);
890 v9fs_path_free(&str);
891 /* +1 to include terminating NULL */
895 static inline bool is_ro_export(FsContext *ctx)
897 return ctx->export_flags & V9FS_RDONLY;
900 static void v9fs_version(void *opaque)
903 V9fsPDU *pdu = opaque;
904 V9fsState *s = pdu->s;
908 v9fs_string_init(&version);
909 err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
914 trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data);
918 if (!strcmp(version.data, "9P2000.u")) {
919 s->proto_version = V9FS_PROTO_2000U;
920 } else if (!strcmp(version.data, "9P2000.L")) {
921 s->proto_version = V9FS_PROTO_2000L;
923 v9fs_string_sprintf(&version, "unknown");
926 err = pdu_marshal(pdu, offset, "ds", s->msize, &version);
932 trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data);
934 complete_pdu(s, pdu, offset);
935 v9fs_string_free(&version);
938 static void v9fs_attach(void *opaque)
940 V9fsPDU *pdu = opaque;
941 V9fsState *s = pdu->s;
942 int32_t fid, afid, n_uname;
943 V9fsString uname, aname;
949 v9fs_string_init(&uname);
950 v9fs_string_init(&aname);
951 err = pdu_unmarshal(pdu, offset, "ddssd", &fid,
952 &afid, &uname, &aname, &n_uname);
956 trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data);
958 fidp = alloc_fid(s, fid);
964 err = v9fs_co_name_to_path(pdu, NULL, "/", &fidp->path);
970 err = fid_to_qid(pdu, fidp, &qid);
976 err = pdu_marshal(pdu, offset, "Q", &qid);
982 trace_v9fs_attach_return(pdu->tag, pdu->id,
983 qid.type, qid.version, qid.path);
985 * disable migration if we haven't done already.
986 * attach could get called multiple times for the same export.
988 if (!s->migration_blocker) {
990 error_setg(&s->migration_blocker,
991 "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
992 s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag);
993 migrate_add_blocker(s->migration_blocker);
998 complete_pdu(s, pdu, err);
999 v9fs_string_free(&uname);
1000 v9fs_string_free(&aname);
1003 static void v9fs_stat(void *opaque)
1011 V9fsPDU *pdu = opaque;
1012 V9fsState *s = pdu->s;
1014 err = pdu_unmarshal(pdu, offset, "d", &fid);
1018 trace_v9fs_stat(pdu->tag, pdu->id, fid);
1020 fidp = get_fid(pdu, fid);
1025 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1029 err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat);
1033 err = pdu_marshal(pdu, offset, "wS", 0, &v9stat);
1035 v9fs_stat_free(&v9stat);
1038 trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode,
1039 v9stat.atime, v9stat.mtime, v9stat.length);
1041 v9fs_stat_free(&v9stat);
1045 complete_pdu(s, pdu, err);
1048 static void v9fs_getattr(void *opaque)
1055 uint64_t request_mask;
1056 V9fsStatDotl v9stat_dotl;
1057 V9fsPDU *pdu = opaque;
1058 V9fsState *s = pdu->s;
1060 retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask);
1064 trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask);
1066 fidp = get_fid(pdu, fid);
1072 * Currently we only support BASIC fields in stat, so there is no
1073 * need to look at request_mask.
1075 retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1079 stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
1081 /* fill st_gen if requested and supported by underlying fs */
1082 if (request_mask & P9_STATS_GEN) {
1083 retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl);
1086 /* we have valid st_gen: update result mask */
1087 v9stat_dotl.st_result_mask |= P9_STATS_GEN;
1090 /* request cancelled, e.g. by Tflush */
1093 /* failed to get st_gen: not fatal, ignore */
1097 retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl);
1102 trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask,
1103 v9stat_dotl.st_mode, v9stat_dotl.st_uid,
1104 v9stat_dotl.st_gid);
1108 complete_pdu(s, pdu, retval);
1111 /* Attribute flags */
1112 #define P9_ATTR_MODE (1 << 0)
1113 #define P9_ATTR_UID (1 << 1)
1114 #define P9_ATTR_GID (1 << 2)
1115 #define P9_ATTR_SIZE (1 << 3)
1116 #define P9_ATTR_ATIME (1 << 4)
1117 #define P9_ATTR_MTIME (1 << 5)
1118 #define P9_ATTR_CTIME (1 << 6)
1119 #define P9_ATTR_ATIME_SET (1 << 7)
1120 #define P9_ATTR_MTIME_SET (1 << 8)
1122 #define P9_ATTR_MASK 127
1124 static void v9fs_setattr(void *opaque)
1131 V9fsPDU *pdu = opaque;
1132 V9fsState *s = pdu->s;
1134 err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr);
1139 fidp = get_fid(pdu, fid);
1144 if (v9iattr.valid & P9_ATTR_MODE) {
1145 err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode);
1150 if (v9iattr.valid & (P9_ATTR_ATIME | P9_ATTR_MTIME)) {
1151 struct timespec times[2];
1152 if (v9iattr.valid & P9_ATTR_ATIME) {
1153 if (v9iattr.valid & P9_ATTR_ATIME_SET) {
1154 times[0].tv_sec = v9iattr.atime_sec;
1155 times[0].tv_nsec = v9iattr.atime_nsec;
1157 times[0].tv_nsec = UTIME_NOW;
1160 times[0].tv_nsec = UTIME_OMIT;
1162 if (v9iattr.valid & P9_ATTR_MTIME) {
1163 if (v9iattr.valid & P9_ATTR_MTIME_SET) {
1164 times[1].tv_sec = v9iattr.mtime_sec;
1165 times[1].tv_nsec = v9iattr.mtime_nsec;
1167 times[1].tv_nsec = UTIME_NOW;
1170 times[1].tv_nsec = UTIME_OMIT;
1172 err = v9fs_co_utimensat(pdu, &fidp->path, times);
1178 * If the only valid entry in iattr is ctime we can call
1179 * chown(-1,-1) to update the ctime of the file
1181 if ((v9iattr.valid & (P9_ATTR_UID | P9_ATTR_GID)) ||
1182 ((v9iattr.valid & P9_ATTR_CTIME)
1183 && !((v9iattr.valid & P9_ATTR_MASK) & ~P9_ATTR_CTIME))) {
1184 if (!(v9iattr.valid & P9_ATTR_UID)) {
1187 if (!(v9iattr.valid & P9_ATTR_GID)) {
1190 err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid,
1196 if (v9iattr.valid & (P9_ATTR_SIZE)) {
1197 err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size);
1206 complete_pdu(s, pdu, err);
1209 static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
1215 err = pdu_marshal(pdu, offset, "w", nwnames);
1220 for (i = 0; i < nwnames; i++) {
1221 err = pdu_marshal(pdu, offset, "Q", &qids[i]);
1230 static void v9fs_walk(void *opaque)
1233 V9fsQID *qids = NULL;
1235 V9fsPath dpath, path;
1239 int32_t fid, newfid;
1240 V9fsString *wnames = NULL;
1242 V9fsFidState *newfidp = NULL;
1243 V9fsPDU *pdu = opaque;
1244 V9fsState *s = pdu->s;
1246 err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames);
1248 complete_pdu(s, pdu, err);
1253 trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames);
1255 if (nwnames && nwnames <= P9_MAXWELEM) {
1256 wnames = g_malloc0(sizeof(wnames[0]) * nwnames);
1257 qids = g_malloc0(sizeof(qids[0]) * nwnames);
1258 for (i = 0; i < nwnames; i++) {
1259 err = pdu_unmarshal(pdu, offset, "s", &wnames[i]);
1265 } else if (nwnames > P9_MAXWELEM) {
1269 fidp = get_fid(pdu, fid);
1274 v9fs_path_init(&dpath);
1275 v9fs_path_init(&path);
1277 * Both dpath and path initially poin to fidp.
1278 * Needed to handle request with nwnames == 0
1280 v9fs_path_copy(&dpath, &fidp->path);
1281 v9fs_path_copy(&path, &fidp->path);
1282 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1283 err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, &path);
1287 err = v9fs_co_lstat(pdu, &path, &stbuf);
1291 stat_to_qid(&stbuf, &qids[name_idx]);
1292 v9fs_path_copy(&dpath, &path);
1294 if (fid == newfid) {
1295 BUG_ON(fidp->fid_type != P9_FID_NONE);
1296 v9fs_path_copy(&fidp->path, &path);
1298 newfidp = alloc_fid(s, newfid);
1299 if (newfidp == NULL) {
1303 newfidp->uid = fidp->uid;
1304 v9fs_path_copy(&newfidp->path, &path);
1306 err = v9fs_walk_marshal(pdu, nwnames, qids);
1307 trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids);
1311 put_fid(pdu, newfidp);
1313 v9fs_path_free(&dpath);
1314 v9fs_path_free(&path);
1316 complete_pdu(s, pdu, err);
1317 if (nwnames && nwnames <= P9_MAXWELEM) {
1318 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1319 v9fs_string_free(&wnames[name_idx]);
1326 static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
1328 struct statfs stbuf;
1330 V9fsState *s = pdu->s;
1333 * iounit should be multiples of f_bsize (host filesystem block size
1334 * and as well as less than (client msize - P9_IOHDRSZ))
1336 if (!v9fs_co_statfs(pdu, path, &stbuf)) {
1337 iounit = stbuf.f_bsize;
1338 iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
1341 iounit = s->msize - P9_IOHDRSZ;
1346 static void v9fs_open(void *opaque)
1357 V9fsPDU *pdu = opaque;
1358 V9fsState *s = pdu->s;
1360 if (s->proto_version == V9FS_PROTO_2000L) {
1361 err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode);
1364 err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte);
1370 trace_v9fs_open(pdu->tag, pdu->id, fid, mode);
1372 fidp = get_fid(pdu, fid);
1377 BUG_ON(fidp->fid_type != P9_FID_NONE);
1379 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1383 stat_to_qid(&stbuf, &qid);
1384 if (S_ISDIR(stbuf.st_mode)) {
1385 err = v9fs_co_opendir(pdu, fidp);
1389 fidp->fid_type = P9_FID_DIR;
1390 err = pdu_marshal(pdu, offset, "Qd", &qid, 0);
1396 if (s->proto_version == V9FS_PROTO_2000L) {
1397 flags = get_dotl_openflags(s, mode);
1399 flags = omode_to_uflags(mode);
1401 if (is_ro_export(&s->ctx)) {
1402 if (mode & O_WRONLY || mode & O_RDWR ||
1403 mode & O_APPEND || mode & O_TRUNC) {
1408 err = v9fs_co_open(pdu, fidp, flags);
1412 fidp->fid_type = P9_FID_FILE;
1413 fidp->open_flags = flags;
1414 if (flags & O_EXCL) {
1416 * We let the host file system do O_EXCL check
1417 * We should not reclaim such fd
1419 fidp->flags |= FID_NON_RECLAIMABLE;
1421 iounit = get_iounit(pdu, &fidp->path);
1422 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
1428 trace_v9fs_open_return(pdu->tag, pdu->id,
1429 qid.type, qid.version, qid.path, iounit);
1433 complete_pdu(s, pdu, err);
1436 static void v9fs_lcreate(void *opaque)
1438 int32_t dfid, flags, mode;
1447 V9fsPDU *pdu = opaque;
1449 v9fs_string_init(&name);
1450 err = pdu_unmarshal(pdu, offset, "dsddd", &dfid,
1451 &name, &flags, &mode, &gid);
1455 trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid);
1457 fidp = get_fid(pdu, dfid);
1463 flags = get_dotl_openflags(pdu->s, flags);
1464 err = v9fs_co_open2(pdu, fidp, &name, gid,
1465 flags | O_CREAT, mode, &stbuf);
1469 fidp->fid_type = P9_FID_FILE;
1470 fidp->open_flags = flags;
1471 if (flags & O_EXCL) {
1473 * We let the host file system do O_EXCL check
1474 * We should not reclaim such fd
1476 fidp->flags |= FID_NON_RECLAIMABLE;
1478 iounit = get_iounit(pdu, &fidp->path);
1479 stat_to_qid(&stbuf, &qid);
1480 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
1485 trace_v9fs_lcreate_return(pdu->tag, pdu->id,
1486 qid.type, qid.version, qid.path, iounit);
1490 complete_pdu(pdu->s, pdu, err);
1491 v9fs_string_free(&name);
1494 static void v9fs_fsync(void *opaque)
1501 V9fsPDU *pdu = opaque;
1502 V9fsState *s = pdu->s;
1504 err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
1508 trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync);
1510 fidp = get_fid(pdu, fid);
1515 err = v9fs_co_fsync(pdu, fidp, datasync);
1521 complete_pdu(s, pdu, err);
1524 static void v9fs_clunk(void *opaque)
1530 V9fsPDU *pdu = opaque;
1531 V9fsState *s = pdu->s;
1533 err = pdu_unmarshal(pdu, offset, "d", &fid);
1537 trace_v9fs_clunk(pdu->tag, pdu->id, fid);
1539 fidp = clunk_fid(s, fid);
1545 * Bump the ref so that put_fid will
1549 err = put_fid(pdu, fidp);
1554 complete_pdu(s, pdu, err);
1557 static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1558 uint64_t off, uint32_t max_count)
1565 xattr_len = fidp->fs.xattr.len;
1566 read_count = xattr_len - off;
1567 if (read_count > max_count) {
1568 read_count = max_count;
1569 } else if (read_count < 0) {
1571 * read beyond XATTR value
1575 err = pdu_marshal(pdu, offset, "d", read_count);
1580 err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset,
1581 ((char *)fidp->fs.xattr.value) + off,
1590 static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
1591 V9fsFidState *fidp, uint32_t max_count)
1598 off_t saved_dir_pos;
1599 struct dirent *dent, *result;
1601 /* save the directory position */
1602 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1603 if (saved_dir_pos < 0) {
1604 return saved_dir_pos;
1607 dent = g_malloc(sizeof(struct dirent));
1610 v9fs_path_init(&path);
1611 err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
1612 if (err || !result) {
1615 err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
1619 err = v9fs_co_lstat(pdu, &path, &stbuf);
1623 err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat);
1627 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1628 len = pdu_marshal(pdu, 11 + count, "S", &v9stat);
1629 if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) {
1630 /* Ran out of buffer. Set dir back to old position and return */
1631 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1632 v9fs_stat_free(&v9stat);
1633 v9fs_path_free(&path);
1638 v9fs_stat_free(&v9stat);
1639 v9fs_path_free(&path);
1640 saved_dir_pos = dent->d_off;
1644 v9fs_path_free(&path);
1652 * Create a QEMUIOVector for a sub-region of PDU iovecs
1654 * @qiov: uninitialized QEMUIOVector
1655 * @skip: number of bytes to skip from beginning of PDU
1656 * @size: number of bytes to include
1657 * @is_write: true - write, false - read
1659 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
1660 * with qemu_iovec_destroy().
1662 static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
1663 size_t skip, size_t size,
1671 iov = pdu->elem.out_sg;
1672 niov = pdu->elem.out_num;
1674 iov = pdu->elem.in_sg;
1675 niov = pdu->elem.in_num;
1678 qemu_iovec_init_external(&elem, iov, niov);
1679 qemu_iovec_init(qiov, niov);
1680 qemu_iovec_concat(qiov, &elem, skip, size);
1683 static void v9fs_read(void *opaque)
1692 V9fsPDU *pdu = opaque;
1693 V9fsState *s = pdu->s;
1695 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count);
1699 trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count);
1701 fidp = get_fid(pdu, fid);
1706 if (fidp->fid_type == P9_FID_DIR) {
1709 v9fs_co_rewinddir(pdu, fidp);
1711 count = v9fs_do_readdir_with_stat(pdu, fidp, max_count);
1716 err = pdu_marshal(pdu, offset, "d", count);
1720 err += offset + count;
1721 } else if (fidp->fid_type == P9_FID_FILE) {
1722 QEMUIOVector qiov_full;
1726 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false);
1727 qemu_iovec_init(&qiov, qiov_full.niov);
1729 qemu_iovec_reset(&qiov);
1730 qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count);
1732 print_sg(qiov.iov, qiov.niov);
1734 /* Loop in case of EINTR */
1736 len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off);
1741 } while (len == -EINTR && !pdu->cancelled);
1743 /* IO error return the error */
1747 } while (count < max_count && len > 0);
1748 err = pdu_marshal(pdu, offset, "d", count);
1752 err += offset + count;
1753 qemu_iovec_destroy(&qiov);
1754 qemu_iovec_destroy(&qiov_full);
1755 } else if (fidp->fid_type == P9_FID_XATTR) {
1756 err = v9fs_xattr_read(s, pdu, fidp, off, max_count);
1760 trace_v9fs_read_return(pdu->tag, pdu->id, count, err);
1764 complete_pdu(s, pdu, err);
1767 static size_t v9fs_readdir_data_size(V9fsString *name)
1770 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1771 * size of type (1) + size of name.size (2) + strlen(name.data)
1773 return 24 + v9fs_string_size(name);
1776 static int v9fs_do_readdir(V9fsPDU *pdu,
1777 V9fsFidState *fidp, int32_t max_count)
1784 off_t saved_dir_pos;
1785 struct dirent *dent, *result;
1787 /* save the directory position */
1788 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1789 if (saved_dir_pos < 0) {
1790 return saved_dir_pos;
1793 dent = g_malloc(sizeof(struct dirent));
1796 err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
1797 if (err || !result) {
1800 v9fs_string_init(&name);
1801 v9fs_string_sprintf(&name, "%s", dent->d_name);
1802 if ((count + v9fs_readdir_data_size(&name)) > max_count) {
1803 /* Ran out of buffer. Set dir back to old position and return */
1804 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1805 v9fs_string_free(&name);
1810 * Fill up just the path field of qid because the client uses
1811 * only that. To fill the entire qid structure we will have
1812 * to stat each dirent found, which is expensive
1814 size = MIN(sizeof(dent->d_ino), sizeof(qid.path));
1815 memcpy(&qid.path, &dent->d_ino, size);
1816 /* Fill the other fields with dummy values */
1820 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1821 len = pdu_marshal(pdu, 11 + count, "Qqbs",
1823 dent->d_type, &name);
1825 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1826 v9fs_string_free(&name);
1831 v9fs_string_free(&name);
1832 saved_dir_pos = dent->d_off;
1841 static void v9fs_readdir(void *opaque)
1847 uint64_t initial_offset;
1850 V9fsPDU *pdu = opaque;
1851 V9fsState *s = pdu->s;
1853 retval = pdu_unmarshal(pdu, offset, "dqd", &fid,
1854 &initial_offset, &max_count);
1858 trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count);
1860 fidp = get_fid(pdu, fid);
1865 if (!fidp->fs.dir) {
1869 if (initial_offset == 0) {
1870 v9fs_co_rewinddir(pdu, fidp);
1872 v9fs_co_seekdir(pdu, fidp, initial_offset);
1874 count = v9fs_do_readdir(pdu, fidp, max_count);
1879 retval = pdu_marshal(pdu, offset, "d", count);
1883 retval += count + offset;
1884 trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval);
1888 complete_pdu(s, pdu, retval);
1891 static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1892 uint64_t off, uint32_t count,
1893 struct iovec *sg, int cnt)
1902 xattr_len = fidp->fs.xattr.len;
1903 write_count = xattr_len - off;
1904 if (write_count > count) {
1905 write_count = count;
1906 } else if (write_count < 0) {
1908 * write beyond XATTR value len specified in
1914 err = pdu_marshal(pdu, offset, "d", write_count);
1919 fidp->fs.xattr.copied_len += write_count;
1921 * Now copy the content from sg list
1923 for (i = 0; i < cnt; i++) {
1924 if (write_count > sg[i].iov_len) {
1925 to_copy = sg[i].iov_len;
1927 to_copy = write_count;
1929 memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy);
1930 /* updating vs->off since we are not using below */
1932 write_count -= to_copy;
1938 static void v9fs_write(void *opaque)
1948 V9fsPDU *pdu = opaque;
1949 V9fsState *s = pdu->s;
1950 QEMUIOVector qiov_full;
1953 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count);
1955 complete_pdu(s, pdu, err);
1959 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true);
1960 trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov);
1962 fidp = get_fid(pdu, fid);
1967 if (fidp->fid_type == P9_FID_FILE) {
1968 if (fidp->fs.fd == -1) {
1972 } else if (fidp->fid_type == P9_FID_XATTR) {
1974 * setxattr operation
1976 err = v9fs_xattr_write(s, pdu, fidp, off, count,
1977 qiov_full.iov, qiov_full.niov);
1983 qemu_iovec_init(&qiov, qiov_full.niov);
1985 qemu_iovec_reset(&qiov);
1986 qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total);
1988 print_sg(qiov.iov, qiov.niov);
1990 /* Loop in case of EINTR */
1992 len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off);
1997 } while (len == -EINTR && !pdu->cancelled);
1999 /* IO error return the error */
2003 } while (total < count && len > 0);
2006 err = pdu_marshal(pdu, offset, "d", total);
2011 trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
2013 qemu_iovec_destroy(&qiov);
2017 qemu_iovec_destroy(&qiov_full);
2018 complete_pdu(s, pdu, err);
2021 static void v9fs_create(void *opaque)
2033 V9fsString extension;
2035 V9fsPDU *pdu = opaque;
2037 v9fs_path_init(&path);
2038 v9fs_string_init(&name);
2039 v9fs_string_init(&extension);
2040 err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name,
2041 &perm, &mode, &extension);
2045 trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode);
2047 fidp = get_fid(pdu, fid);
2052 if (perm & P9_STAT_MODE_DIR) {
2053 err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777,
2054 fidp->uid, -1, &stbuf);
2058 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2062 v9fs_path_copy(&fidp->path, &path);
2063 err = v9fs_co_opendir(pdu, fidp);
2067 fidp->fid_type = P9_FID_DIR;
2068 } else if (perm & P9_STAT_MODE_SYMLINK) {
2069 err = v9fs_co_symlink(pdu, fidp, &name,
2070 extension.data, -1 , &stbuf);
2074 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2078 v9fs_path_copy(&fidp->path, &path);
2079 } else if (perm & P9_STAT_MODE_LINK) {
2080 int32_t ofid = atoi(extension.data);
2081 V9fsFidState *ofidp = get_fid(pdu, ofid);
2082 if (ofidp == NULL) {
2086 err = v9fs_co_link(pdu, ofidp, fidp, &name);
2087 put_fid(pdu, ofidp);
2091 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2093 fidp->fid_type = P9_FID_NONE;
2096 v9fs_path_copy(&fidp->path, &path);
2097 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2099 fidp->fid_type = P9_FID_NONE;
2102 } else if (perm & P9_STAT_MODE_DEVICE) {
2104 uint32_t major, minor;
2107 if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) {
2124 nmode |= perm & 0777;
2125 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2126 makedev(major, minor), nmode, &stbuf);
2130 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2134 v9fs_path_copy(&fidp->path, &path);
2135 } else if (perm & P9_STAT_MODE_NAMED_PIPE) {
2136 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2137 0, S_IFIFO | (perm & 0777), &stbuf);
2141 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2145 v9fs_path_copy(&fidp->path, &path);
2146 } else if (perm & P9_STAT_MODE_SOCKET) {
2147 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2148 0, S_IFSOCK | (perm & 0777), &stbuf);
2152 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2156 v9fs_path_copy(&fidp->path, &path);
2158 err = v9fs_co_open2(pdu, fidp, &name, -1,
2159 omode_to_uflags(mode)|O_CREAT, perm, &stbuf);
2163 fidp->fid_type = P9_FID_FILE;
2164 fidp->open_flags = omode_to_uflags(mode);
2165 if (fidp->open_flags & O_EXCL) {
2167 * We let the host file system do O_EXCL check
2168 * We should not reclaim such fd
2170 fidp->flags |= FID_NON_RECLAIMABLE;
2173 iounit = get_iounit(pdu, &fidp->path);
2174 stat_to_qid(&stbuf, &qid);
2175 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit);
2180 trace_v9fs_create_return(pdu->tag, pdu->id,
2181 qid.type, qid.version, qid.path, iounit);
2185 complete_pdu(pdu->s, pdu, err);
2186 v9fs_string_free(&name);
2187 v9fs_string_free(&extension);
2188 v9fs_path_free(&path);
2191 static void v9fs_symlink(void *opaque)
2193 V9fsPDU *pdu = opaque;
2196 V9fsFidState *dfidp;
2204 v9fs_string_init(&name);
2205 v9fs_string_init(&symname);
2206 err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid);
2210 trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid);
2212 dfidp = get_fid(pdu, dfid);
2213 if (dfidp == NULL) {
2217 err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf);
2221 stat_to_qid(&stbuf, &qid);
2222 err = pdu_marshal(pdu, offset, "Q", &qid);
2227 trace_v9fs_symlink_return(pdu->tag, pdu->id,
2228 qid.type, qid.version, qid.path);
2230 put_fid(pdu, dfidp);
2232 complete_pdu(pdu->s, pdu, err);
2233 v9fs_string_free(&name);
2234 v9fs_string_free(&symname);
2237 static void v9fs_flush(void *opaque)
2242 V9fsPDU *cancel_pdu;
2243 V9fsPDU *pdu = opaque;
2244 V9fsState *s = pdu->s;
2246 err = pdu_unmarshal(pdu, offset, "w", &tag);
2248 complete_pdu(s, pdu, err);
2251 trace_v9fs_flush(pdu->tag, pdu->id, tag);
2253 QLIST_FOREACH(cancel_pdu, &s->active_list, next) {
2254 if (cancel_pdu->tag == tag) {
2259 cancel_pdu->cancelled = 1;
2261 * Wait for pdu to complete.
2263 qemu_co_queue_wait(&cancel_pdu->complete);
2264 cancel_pdu->cancelled = 0;
2265 free_pdu(pdu->s, cancel_pdu);
2267 complete_pdu(s, pdu, 7);
2270 static void v9fs_link(void *opaque)
2272 V9fsPDU *pdu = opaque;
2273 V9fsState *s = pdu->s;
2274 int32_t dfid, oldfid;
2275 V9fsFidState *dfidp, *oldfidp;
2280 v9fs_string_init(&name);
2281 err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
2285 trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data);
2287 dfidp = get_fid(pdu, dfid);
2288 if (dfidp == NULL) {
2293 oldfidp = get_fid(pdu, oldfid);
2294 if (oldfidp == NULL) {
2298 err = v9fs_co_link(pdu, oldfidp, dfidp, &name);
2303 put_fid(pdu, dfidp);
2305 v9fs_string_free(&name);
2306 complete_pdu(s, pdu, err);
2309 /* Only works with path name based fid */
2310 static void v9fs_remove(void *opaque)
2316 V9fsPDU *pdu = opaque;
2318 err = pdu_unmarshal(pdu, offset, "d", &fid);
2322 trace_v9fs_remove(pdu->tag, pdu->id, fid);
2324 fidp = get_fid(pdu, fid);
2329 /* if fs driver is not path based, return EOPNOTSUPP */
2330 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
2335 * IF the file is unlinked, we cannot reopen
2336 * the file later. So don't reclaim fd
2338 err = v9fs_mark_fids_unreclaim(pdu, &fidp->path);
2342 err = v9fs_co_remove(pdu, &fidp->path);
2347 /* For TREMOVE we need to clunk the fid even on failed remove */
2348 clunk_fid(pdu->s, fidp->fid);
2351 complete_pdu(pdu->s, pdu, err);
2354 static void v9fs_unlinkat(void *opaque)
2358 int32_t dfid, flags;
2361 V9fsFidState *dfidp;
2362 V9fsPDU *pdu = opaque;
2364 v9fs_string_init(&name);
2365 err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags);
2369 dfidp = get_fid(pdu, dfid);
2370 if (dfidp == NULL) {
2375 * IF the file is unlinked, we cannot reopen
2376 * the file later. So don't reclaim fd
2378 v9fs_path_init(&path);
2379 err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path);
2383 err = v9fs_mark_fids_unreclaim(pdu, &path);
2387 err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags);
2392 put_fid(pdu, dfidp);
2393 v9fs_path_free(&path);
2395 complete_pdu(pdu->s, pdu, err);
2396 v9fs_string_free(&name);
2400 /* Only works with path name based fid */
2401 static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
2402 int32_t newdirfid, V9fsString *name)
2407 V9fsFidState *tfidp;
2408 V9fsState *s = pdu->s;
2409 V9fsFidState *dirfidp = NULL;
2410 char *old_name, *new_name;
2412 v9fs_path_init(&new_path);
2413 if (newdirfid != -1) {
2414 dirfidp = get_fid(pdu, newdirfid);
2415 if (dirfidp == NULL) {
2419 BUG_ON(dirfidp->fid_type != P9_FID_NONE);
2420 v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
2422 old_name = fidp->path.data;
2423 end = strrchr(old_name, '/');
2429 new_name = g_malloc0(end - old_name + name->size + 1);
2430 strncat(new_name, old_name, end - old_name);
2431 strncat(new_name + (end - old_name), name->data, name->size);
2432 v9fs_co_name_to_path(pdu, NULL, new_name, &new_path);
2435 err = v9fs_co_rename(pdu, &fidp->path, &new_path);
2440 * Fixup fid's pointing to the old name to
2441 * start pointing to the new name
2443 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2444 if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) {
2445 /* replace the name */
2446 v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data));
2451 put_fid(pdu, dirfidp);
2453 v9fs_path_free(&new_path);
2458 /* Only works with path name based fid */
2459 static void v9fs_rename(void *opaque)
2467 V9fsPDU *pdu = opaque;
2468 V9fsState *s = pdu->s;
2470 v9fs_string_init(&name);
2471 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name);
2475 fidp = get_fid(pdu, fid);
2480 BUG_ON(fidp->fid_type != P9_FID_NONE);
2481 /* if fs driver is not path based, return EOPNOTSUPP */
2482 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT)) {
2486 v9fs_path_write_lock(s);
2487 err = v9fs_complete_rename(pdu, fidp, newdirfid, &name);
2488 v9fs_path_unlock(s);
2495 complete_pdu(s, pdu, err);
2496 v9fs_string_free(&name);
2499 static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
2500 V9fsString *old_name, V9fsPath *newdir,
2501 V9fsString *new_name)
2503 V9fsFidState *tfidp;
2504 V9fsPath oldpath, newpath;
2505 V9fsState *s = pdu->s;
2508 v9fs_path_init(&oldpath);
2509 v9fs_path_init(&newpath);
2510 v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
2511 v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
2514 * Fixup fid's pointing to the old name to
2515 * start pointing to the new name
2517 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2518 if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) {
2519 /* replace the name */
2520 v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
2523 v9fs_path_free(&oldpath);
2524 v9fs_path_free(&newpath);
2527 static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
2528 V9fsString *old_name, int32_t newdirfid,
2529 V9fsString *new_name)
2532 V9fsState *s = pdu->s;
2533 V9fsFidState *newdirfidp = NULL, *olddirfidp = NULL;
2535 olddirfidp = get_fid(pdu, olddirfid);
2536 if (olddirfidp == NULL) {
2540 if (newdirfid != -1) {
2541 newdirfidp = get_fid(pdu, newdirfid);
2542 if (newdirfidp == NULL) {
2547 newdirfidp = get_fid(pdu, olddirfid);
2550 err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name,
2551 &newdirfidp->path, new_name);
2555 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
2556 /* Only for path based fid we need to do the below fixup */
2557 v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
2558 &newdirfidp->path, new_name);
2562 put_fid(pdu, olddirfidp);
2565 put_fid(pdu, newdirfidp);
2570 static void v9fs_renameat(void *opaque)
2574 V9fsPDU *pdu = opaque;
2575 V9fsState *s = pdu->s;
2576 int32_t olddirfid, newdirfid;
2577 V9fsString old_name, new_name;
2579 v9fs_string_init(&old_name);
2580 v9fs_string_init(&new_name);
2581 err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid,
2582 &old_name, &newdirfid, &new_name);
2587 v9fs_path_write_lock(s);
2588 err = v9fs_complete_renameat(pdu, olddirfid,
2589 &old_name, newdirfid, &new_name);
2590 v9fs_path_unlock(s);
2596 complete_pdu(s, pdu, err);
2597 v9fs_string_free(&old_name);
2598 v9fs_string_free(&new_name);
2601 static void v9fs_wstat(void *opaque)
2610 V9fsPDU *pdu = opaque;
2611 V9fsState *s = pdu->s;
2613 v9fs_stat_init(&v9stat);
2614 err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat);
2618 trace_v9fs_wstat(pdu->tag, pdu->id, fid,
2619 v9stat.mode, v9stat.atime, v9stat.mtime);
2621 fidp = get_fid(pdu, fid);
2626 /* do we need to sync the file? */
2627 if (donttouch_stat(&v9stat)) {
2628 err = v9fs_co_fsync(pdu, fidp, 0);
2631 if (v9stat.mode != -1) {
2633 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2637 v9_mode = stat_to_v9mode(&stbuf);
2638 if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
2639 (v9_mode & P9_STAT_MODE_TYPE_BITS)) {
2640 /* Attempting to change the type */
2644 err = v9fs_co_chmod(pdu, &fidp->path,
2645 v9mode_to_mode(v9stat.mode,
2646 &v9stat.extension));
2651 if (v9stat.mtime != -1 || v9stat.atime != -1) {
2652 struct timespec times[2];
2653 if (v9stat.atime != -1) {
2654 times[0].tv_sec = v9stat.atime;
2655 times[0].tv_nsec = 0;
2657 times[0].tv_nsec = UTIME_OMIT;
2659 if (v9stat.mtime != -1) {
2660 times[1].tv_sec = v9stat.mtime;
2661 times[1].tv_nsec = 0;
2663 times[1].tv_nsec = UTIME_OMIT;
2665 err = v9fs_co_utimensat(pdu, &fidp->path, times);
2670 if (v9stat.n_gid != -1 || v9stat.n_uid != -1) {
2671 err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid);
2676 if (v9stat.name.size != 0) {
2677 err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name);
2682 if (v9stat.length != -1) {
2683 err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length);
2692 v9fs_stat_free(&v9stat);
2693 complete_pdu(s, pdu, err);
2696 static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf)
2708 int32_t bsize_factor;
2711 * compute bsize factor based on host file system block size
2714 bsize_factor = (s->msize - P9_IOHDRSZ)/stbuf->f_bsize;
2715 if (!bsize_factor) {
2718 f_type = stbuf->f_type;
2719 f_bsize = stbuf->f_bsize;
2720 f_bsize *= bsize_factor;
2722 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2723 * adjust(divide) the number of blocks, free blocks and available
2724 * blocks by bsize factor
2726 f_blocks = stbuf->f_blocks/bsize_factor;
2727 f_bfree = stbuf->f_bfree/bsize_factor;
2728 f_bavail = stbuf->f_bavail/bsize_factor;
2729 f_files = stbuf->f_files;
2730 f_ffree = stbuf->f_ffree;
2731 fsid_val = (unsigned int) stbuf->f_fsid.__val[0] |
2732 (unsigned long long)stbuf->f_fsid.__val[1] << 32;
2733 f_namelen = stbuf->f_namelen;
2735 return pdu_marshal(pdu, offset, "ddqqqqqqd",
2736 f_type, f_bsize, f_blocks, f_bfree,
2737 f_bavail, f_files, f_ffree,
2738 fsid_val, f_namelen);
2741 static void v9fs_statfs(void *opaque)
2747 struct statfs stbuf;
2748 V9fsPDU *pdu = opaque;
2749 V9fsState *s = pdu->s;
2751 retval = pdu_unmarshal(pdu, offset, "d", &fid);
2755 fidp = get_fid(pdu, fid);
2760 retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf);
2764 retval = v9fs_fill_statfs(s, pdu, &stbuf);
2772 complete_pdu(s, pdu, retval);
2775 static void v9fs_mknod(void *opaque)
2788 V9fsPDU *pdu = opaque;
2789 V9fsState *s = pdu->s;
2791 v9fs_string_init(&name);
2792 err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode,
2793 &major, &minor, &gid);
2797 trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor);
2799 fidp = get_fid(pdu, fid);
2804 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid,
2805 makedev(major, minor), mode, &stbuf);
2809 stat_to_qid(&stbuf, &qid);
2810 err = pdu_marshal(pdu, offset, "Q", &qid);
2815 trace_v9fs_mknod_return(pdu->tag, pdu->id,
2816 qid.type, qid.version, qid.path);
2820 complete_pdu(s, pdu, err);
2821 v9fs_string_free(&name);
2825 * Implement posix byte range locking code
2826 * Server side handling of locking code is very simple, because 9p server in
2827 * QEMU can handle only one client. And most of the lock handling
2828 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
2829 * do any thing in * qemu 9p server side lock code path.
2830 * So when a TLOCK request comes, always return success
2832 static void v9fs_lock(void *opaque)
2839 int32_t fid, err = 0;
2840 V9fsPDU *pdu = opaque;
2841 V9fsState *s = pdu->s;
2843 status = P9_LOCK_ERROR;
2844 v9fs_string_init(&flock.client_id);
2845 err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type,
2846 &flock.flags, &flock.start, &flock.length,
2847 &flock.proc_id, &flock.client_id);
2851 trace_v9fs_lock(pdu->tag, pdu->id, fid,
2852 flock.type, flock.start, flock.length);
2855 /* We support only block flag now (that too ignored currently) */
2856 if (flock.flags & ~P9_LOCK_FLAGS_BLOCK) {
2860 fidp = get_fid(pdu, fid);
2865 err = v9fs_co_fstat(pdu, fidp, &stbuf);
2869 status = P9_LOCK_SUCCESS;
2873 err = pdu_marshal(pdu, offset, "b", status);
2877 trace_v9fs_lock_return(pdu->tag, pdu->id, status);
2878 complete_pdu(s, pdu, err);
2879 v9fs_string_free(&flock.client_id);
2883 * When a TGETLOCK request comes, always return success because all lock
2884 * handling is done by client's VFS layer.
2886 static void v9fs_getlock(void *opaque)
2892 int32_t fid, err = 0;
2893 V9fsPDU *pdu = opaque;
2894 V9fsState *s = pdu->s;
2896 v9fs_string_init(&glock.client_id);
2897 err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type,
2898 &glock.start, &glock.length, &glock.proc_id,
2903 trace_v9fs_getlock(pdu->tag, pdu->id, fid,
2904 glock.type, glock.start, glock.length);
2906 fidp = get_fid(pdu, fid);
2911 err = v9fs_co_fstat(pdu, fidp, &stbuf);
2915 glock.type = P9_LOCK_TYPE_UNLCK;
2916 err = pdu_marshal(pdu, offset, "bqqds", glock.type,
2917 glock.start, glock.length, glock.proc_id,
2923 trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start,
2924 glock.length, glock.proc_id);
2928 complete_pdu(s, pdu, err);
2929 v9fs_string_free(&glock.client_id);
2932 static void v9fs_mkdir(void *opaque)
2934 V9fsPDU *pdu = opaque;
2945 v9fs_string_init(&name);
2946 err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid);
2950 trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid);
2952 fidp = get_fid(pdu, fid);
2957 err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf);
2961 stat_to_qid(&stbuf, &qid);
2962 err = pdu_marshal(pdu, offset, "Q", &qid);
2967 trace_v9fs_mkdir_return(pdu->tag, pdu->id,
2968 qid.type, qid.version, qid.path, err);
2972 complete_pdu(pdu->s, pdu, err);
2973 v9fs_string_free(&name);
2976 static void v9fs_xattrwalk(void *opaque)
2982 int32_t fid, newfid;
2983 V9fsFidState *file_fidp;
2984 V9fsFidState *xattr_fidp = NULL;
2985 V9fsPDU *pdu = opaque;
2986 V9fsState *s = pdu->s;
2988 v9fs_string_init(&name);
2989 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name);
2993 trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data);
2995 file_fidp = get_fid(pdu, fid);
2996 if (file_fidp == NULL) {
3000 xattr_fidp = alloc_fid(s, newfid);
3001 if (xattr_fidp == NULL) {
3005 v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
3006 if (name.data == NULL) {
3008 * listxattr request. Get the size first
3010 size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL, 0);
3013 clunk_fid(s, xattr_fidp->fid);
3017 * Read the xattr value
3019 xattr_fidp->fs.xattr.len = size;
3020 xattr_fidp->fid_type = P9_FID_XATTR;
3021 xattr_fidp->fs.xattr.copied_len = -1;
3023 xattr_fidp->fs.xattr.value = g_malloc(size);
3024 err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
3025 xattr_fidp->fs.xattr.value,
3026 xattr_fidp->fs.xattr.len);
3028 clunk_fid(s, xattr_fidp->fid);
3032 err = pdu_marshal(pdu, offset, "q", size);
3039 * specific xattr fid. We check for xattr
3040 * presence also collect the xattr size
3042 size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3046 clunk_fid(s, xattr_fidp->fid);
3050 * Read the xattr value
3052 xattr_fidp->fs.xattr.len = size;
3053 xattr_fidp->fid_type = P9_FID_XATTR;
3054 xattr_fidp->fs.xattr.copied_len = -1;
3056 xattr_fidp->fs.xattr.value = g_malloc(size);
3057 err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3058 &name, xattr_fidp->fs.xattr.value,
3059 xattr_fidp->fs.xattr.len);
3061 clunk_fid(s, xattr_fidp->fid);
3065 err = pdu_marshal(pdu, offset, "q", size);
3071 trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size);
3073 put_fid(pdu, file_fidp);
3075 put_fid(pdu, xattr_fidp);
3078 complete_pdu(s, pdu, err);
3079 v9fs_string_free(&name);
3082 static void v9fs_xattrcreate(void *opaque)
3090 V9fsFidState *file_fidp;
3091 V9fsFidState *xattr_fidp;
3092 V9fsPDU *pdu = opaque;
3093 V9fsState *s = pdu->s;
3095 v9fs_string_init(&name);
3096 err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags);
3100 trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
3102 file_fidp = get_fid(pdu, fid);
3103 if (file_fidp == NULL) {
3107 /* Make the file fid point to xattr */
3108 xattr_fidp = file_fidp;
3109 xattr_fidp->fid_type = P9_FID_XATTR;
3110 xattr_fidp->fs.xattr.copied_len = 0;
3111 xattr_fidp->fs.xattr.len = size;
3112 xattr_fidp->fs.xattr.flags = flags;
3113 v9fs_string_init(&xattr_fidp->fs.xattr.name);
3114 v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
3115 xattr_fidp->fs.xattr.value = g_malloc(size);
3117 put_fid(pdu, file_fidp);
3119 complete_pdu(s, pdu, err);
3120 v9fs_string_free(&name);
3123 static void v9fs_readlink(void *opaque)
3125 V9fsPDU *pdu = opaque;
3132 err = pdu_unmarshal(pdu, offset, "d", &fid);
3136 trace_v9fs_readlink(pdu->tag, pdu->id, fid);
3137 fidp = get_fid(pdu, fid);
3143 v9fs_string_init(&target);
3144 err = v9fs_co_readlink(pdu, &fidp->path, &target);
3148 err = pdu_marshal(pdu, offset, "s", &target);
3150 v9fs_string_free(&target);
3154 trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data);
3155 v9fs_string_free(&target);
3159 complete_pdu(pdu->s, pdu, err);
3162 static CoroutineEntry *pdu_co_handlers[] = {
3163 [P9_TREADDIR] = v9fs_readdir,
3164 [P9_TSTATFS] = v9fs_statfs,
3165 [P9_TGETATTR] = v9fs_getattr,
3166 [P9_TSETATTR] = v9fs_setattr,
3167 [P9_TXATTRWALK] = v9fs_xattrwalk,
3168 [P9_TXATTRCREATE] = v9fs_xattrcreate,
3169 [P9_TMKNOD] = v9fs_mknod,
3170 [P9_TRENAME] = v9fs_rename,
3171 [P9_TLOCK] = v9fs_lock,
3172 [P9_TGETLOCK] = v9fs_getlock,
3173 [P9_TRENAMEAT] = v9fs_renameat,
3174 [P9_TREADLINK] = v9fs_readlink,
3175 [P9_TUNLINKAT] = v9fs_unlinkat,
3176 [P9_TMKDIR] = v9fs_mkdir,
3177 [P9_TVERSION] = v9fs_version,
3178 [P9_TLOPEN] = v9fs_open,
3179 [P9_TATTACH] = v9fs_attach,
3180 [P9_TSTAT] = v9fs_stat,
3181 [P9_TWALK] = v9fs_walk,
3182 [P9_TCLUNK] = v9fs_clunk,
3183 [P9_TFSYNC] = v9fs_fsync,
3184 [P9_TOPEN] = v9fs_open,
3185 [P9_TREAD] = v9fs_read,
3187 [P9_TAUTH] = v9fs_auth,
3189 [P9_TFLUSH] = v9fs_flush,
3190 [P9_TLINK] = v9fs_link,
3191 [P9_TSYMLINK] = v9fs_symlink,
3192 [P9_TCREATE] = v9fs_create,
3193 [P9_TLCREATE] = v9fs_lcreate,
3194 [P9_TWRITE] = v9fs_write,
3195 [P9_TWSTAT] = v9fs_wstat,
3196 [P9_TREMOVE] = v9fs_remove,
3199 static void v9fs_op_not_supp(void *opaque)
3201 V9fsPDU *pdu = opaque;
3202 complete_pdu(pdu->s, pdu, -EOPNOTSUPP);
3205 static void v9fs_fs_ro(void *opaque)
3207 V9fsPDU *pdu = opaque;
3208 complete_pdu(pdu->s, pdu, -EROFS);
3211 static inline bool is_read_only_op(V9fsPDU *pdu)
3238 static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
3241 CoroutineEntry *handler;
3243 if (pdu->id >= ARRAY_SIZE(pdu_co_handlers) ||
3244 (pdu_co_handlers[pdu->id] == NULL)) {
3245 handler = v9fs_op_not_supp;
3247 handler = pdu_co_handlers[pdu->id];
3250 if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) {
3251 handler = v9fs_fs_ro;
3253 co = qemu_coroutine_create(handler);
3254 qemu_coroutine_enter(co, pdu);
3257 void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
3259 V9fsState *s = (V9fsState *)vdev;
3263 while ((pdu = alloc_pdu(s)) &&
3264 (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
3273 BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
3274 QEMU_BUILD_BUG_ON(sizeof out != 7);
3276 len = iov_to_buf(pdu->elem.out_sg, pdu->elem.out_num, 0,
3278 BUG_ON(len != sizeof out);
3280 pdu->size = le32_to_cpu(out.size_le);
3283 pdu->tag = le16_to_cpu(out.tag_le);
3285 qemu_co_queue_init(&pdu->complete);
3291 static void __attribute__((__constructor__)) virtio_9p_set_fd_limit(void)
3294 if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
3295 fprintf(stderr, "Failed to get the resource limit\n");
3298 open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3);
3299 open_fd_rc = rlim.rlim_cur/2;