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 "qemu/osdep.h"
15 #include <glib/gprintf.h>
16 #include "hw/virtio/virtio.h"
17 #include "qapi/error.h"
18 #include "qemu/error-report.h"
20 #include "qemu/sockets.h"
21 #include "virtio-9p.h"
22 #include "fsdev/qemu-fsdev.h"
26 #include "migration/blocker.h"
30 static int open_fd_rc
;
44 ssize_t
pdu_marshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
50 ret
= pdu
->s
->transport
->pdu_vmarshal(pdu
, offset
, fmt
, ap
);
56 ssize_t
pdu_unmarshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
62 ret
= pdu
->s
->transport
->pdu_vunmarshal(pdu
, offset
, fmt
, ap
);
68 static int omode_to_uflags(int8_t mode
)
102 struct dotl_openflag_map
{
107 static int dotl_to_open_flags(int flags
)
111 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
112 * and P9_DOTL_NOACCESS
114 int oflags
= flags
& O_ACCMODE
;
116 struct dotl_openflag_map dotl_oflag_map
[] = {
117 { P9_DOTL_CREATE
, O_CREAT
},
118 { P9_DOTL_EXCL
, O_EXCL
},
119 { P9_DOTL_NOCTTY
, O_NOCTTY
},
120 { P9_DOTL_TRUNC
, O_TRUNC
},
121 { P9_DOTL_APPEND
, O_APPEND
},
122 { P9_DOTL_NONBLOCK
, O_NONBLOCK
} ,
123 { P9_DOTL_DSYNC
, O_DSYNC
},
124 { P9_DOTL_FASYNC
, FASYNC
},
125 { P9_DOTL_DIRECT
, O_DIRECT
},
126 { P9_DOTL_LARGEFILE
, O_LARGEFILE
},
127 { P9_DOTL_DIRECTORY
, O_DIRECTORY
},
128 { P9_DOTL_NOFOLLOW
, O_NOFOLLOW
},
129 { P9_DOTL_NOATIME
, O_NOATIME
},
130 { P9_DOTL_SYNC
, O_SYNC
},
133 for (i
= 0; i
< ARRAY_SIZE(dotl_oflag_map
); i
++) {
134 if (flags
& dotl_oflag_map
[i
].dotl_flag
) {
135 oflags
|= dotl_oflag_map
[i
].open_flag
;
142 void cred_init(FsCred
*credp
)
150 static int get_dotl_openflags(V9fsState
*s
, int oflags
)
154 * Filter the client open flags
156 flags
= dotl_to_open_flags(oflags
);
157 flags
&= ~(O_NOCTTY
| O_ASYNC
| O_CREAT
);
159 * Ignore direct disk access hint until the server supports it.
165 void v9fs_path_init(V9fsPath
*path
)
171 void v9fs_path_free(V9fsPath
*path
)
179 void GCC_FMT_ATTR(2, 3)
180 v9fs_path_sprintf(V9fsPath
*path
, const char *fmt
, ...)
184 v9fs_path_free(path
);
187 /* Bump the size for including terminating NULL */
188 path
->size
= g_vasprintf(&path
->data
, fmt
, ap
) + 1;
192 void v9fs_path_copy(V9fsPath
*lhs
, V9fsPath
*rhs
)
195 lhs
->data
= g_malloc(rhs
->size
);
196 memcpy(lhs
->data
, rhs
->data
, rhs
->size
);
197 lhs
->size
= rhs
->size
;
200 int v9fs_name_to_path(V9fsState
*s
, V9fsPath
*dirpath
,
201 const char *name
, V9fsPath
*path
)
204 err
= s
->ops
->name_to_path(&s
->ctx
, dirpath
, name
, path
);
212 * Return TRUE if s1 is an ancestor of s2.
214 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
215 * As a special case, We treat s1 as ancestor of s2 if they are same!
217 static int v9fs_path_is_ancestor(V9fsPath
*s1
, V9fsPath
*s2
)
219 if (!strncmp(s1
->data
, s2
->data
, s1
->size
- 1)) {
220 if (s2
->data
[s1
->size
- 1] == '\0' || s2
->data
[s1
->size
- 1] == '/') {
227 static size_t v9fs_string_size(V9fsString
*str
)
233 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
234 static int coroutine_fn
v9fs_reopen_fid(V9fsPDU
*pdu
, V9fsFidState
*f
)
237 if (f
->fid_type
== P9_FID_FILE
) {
238 if (f
->fs
.fd
== -1) {
240 err
= v9fs_co_open(pdu
, f
, f
->open_flags
);
241 } while (err
== -EINTR
&& !pdu
->cancelled
);
243 } else if (f
->fid_type
== P9_FID_DIR
) {
244 if (f
->fs
.dir
.stream
== NULL
) {
246 err
= v9fs_co_opendir(pdu
, f
);
247 } while (err
== -EINTR
&& !pdu
->cancelled
);
253 static V9fsFidState
*coroutine_fn
get_fid(V9fsPDU
*pdu
, int32_t fid
)
257 V9fsState
*s
= pdu
->s
;
259 for (f
= s
->fid_list
; f
; f
= f
->next
) {
263 * Update the fid ref upfront so that
264 * we don't get reclaimed when we yield
269 * check whether we need to reopen the
270 * file. We might have closed the fd
271 * while trying to free up some file
274 err
= v9fs_reopen_fid(pdu
, f
);
280 * Mark the fid as referenced so that the LRU
281 * reclaim won't close the file descriptor
283 f
->flags
|= FID_REFERENCED
;
290 static V9fsFidState
*alloc_fid(V9fsState
*s
, int32_t fid
)
294 for (f
= s
->fid_list
; f
; f
= f
->next
) {
295 /* If fid is already there return NULL */
301 f
= g_malloc0(sizeof(V9fsFidState
));
303 f
->fid_type
= P9_FID_NONE
;
306 * Mark the fid as referenced so that the LRU
307 * reclaim won't close the file descriptor
309 f
->flags
|= FID_REFERENCED
;
310 f
->next
= s
->fid_list
;
313 v9fs_readdir_init(&f
->fs
.dir
);
314 v9fs_readdir_init(&f
->fs_reclaim
.dir
);
319 static int coroutine_fn
v9fs_xattr_fid_clunk(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
323 if (fidp
->fs
.xattr
.xattrwalk_fid
) {
324 /* getxattr/listxattr fid */
328 * if this is fid for setxattr. clunk should
329 * result in setxattr localcall
331 if (fidp
->fs
.xattr
.len
!= fidp
->fs
.xattr
.copied_len
) {
332 /* clunk after partial write */
336 if (fidp
->fs
.xattr
.len
) {
337 retval
= v9fs_co_lsetxattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
,
338 fidp
->fs
.xattr
.value
,
340 fidp
->fs
.xattr
.flags
);
342 retval
= v9fs_co_lremovexattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
);
345 v9fs_string_free(&fidp
->fs
.xattr
.name
);
347 g_free(fidp
->fs
.xattr
.value
);
351 static int coroutine_fn
free_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
355 if (fidp
->fid_type
== P9_FID_FILE
) {
356 /* If we reclaimed the fd no need to close */
357 if (fidp
->fs
.fd
!= -1) {
358 retval
= v9fs_co_close(pdu
, &fidp
->fs
);
360 } else if (fidp
->fid_type
== P9_FID_DIR
) {
361 if (fidp
->fs
.dir
.stream
!= NULL
) {
362 retval
= v9fs_co_closedir(pdu
, &fidp
->fs
);
364 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
365 retval
= v9fs_xattr_fid_clunk(pdu
, fidp
);
367 v9fs_path_free(&fidp
->path
);
372 static int coroutine_fn
put_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
377 * Don't free the fid if it is in reclaim list
379 if (!fidp
->ref
&& fidp
->clunked
) {
380 if (fidp
->fid
== pdu
->s
->root_fid
) {
382 * if the clunked fid is root fid then we
383 * have unmounted the fs on the client side.
384 * delete the migration blocker. Ideally, this
385 * should be hooked to transport close notification
387 if (pdu
->s
->migration_blocker
) {
388 migrate_del_blocker(pdu
->s
->migration_blocker
);
389 error_free(pdu
->s
->migration_blocker
);
390 pdu
->s
->migration_blocker
= NULL
;
393 return free_fid(pdu
, fidp
);
398 static V9fsFidState
*clunk_fid(V9fsState
*s
, int32_t fid
)
400 V9fsFidState
**fidpp
, *fidp
;
402 for (fidpp
= &s
->fid_list
; *fidpp
; fidpp
= &(*fidpp
)->next
) {
403 if ((*fidpp
)->fid
== fid
) {
407 if (*fidpp
== NULL
) {
416 void coroutine_fn
v9fs_reclaim_fd(V9fsPDU
*pdu
)
418 int reclaim_count
= 0;
419 V9fsState
*s
= pdu
->s
;
420 V9fsFidState
*f
, *reclaim_list
= NULL
;
422 for (f
= s
->fid_list
; f
; f
= f
->next
) {
424 * Unlink fids cannot be reclaimed. Check
425 * for them and skip them. Also skip fids
426 * currently being operated on.
428 if (f
->ref
|| f
->flags
& FID_NON_RECLAIMABLE
) {
432 * if it is a recently referenced fid
433 * we leave the fid untouched and clear the
434 * reference bit. We come back to it later
435 * in the next iteration. (a simple LRU without
436 * moving list elements around)
438 if (f
->flags
& FID_REFERENCED
) {
439 f
->flags
&= ~FID_REFERENCED
;
443 * Add fids to reclaim list.
445 if (f
->fid_type
== P9_FID_FILE
) {
446 if (f
->fs
.fd
!= -1) {
448 * Up the reference count so that
449 * a clunk request won't free this fid
452 f
->rclm_lst
= reclaim_list
;
454 f
->fs_reclaim
.fd
= f
->fs
.fd
;
458 } else if (f
->fid_type
== P9_FID_DIR
) {
459 if (f
->fs
.dir
.stream
!= NULL
) {
461 * Up the reference count so that
462 * a clunk request won't free this fid
465 f
->rclm_lst
= reclaim_list
;
467 f
->fs_reclaim
.dir
.stream
= f
->fs
.dir
.stream
;
468 f
->fs
.dir
.stream
= NULL
;
472 if (reclaim_count
>= open_fd_rc
) {
477 * Now close the fid in reclaim list. Free them if they
478 * are already clunked.
480 while (reclaim_list
) {
482 reclaim_list
= f
->rclm_lst
;
483 if (f
->fid_type
== P9_FID_FILE
) {
484 v9fs_co_close(pdu
, &f
->fs_reclaim
);
485 } else if (f
->fid_type
== P9_FID_DIR
) {
486 v9fs_co_closedir(pdu
, &f
->fs_reclaim
);
490 * Now drop the fid reference, free it
497 static int coroutine_fn
v9fs_mark_fids_unreclaim(V9fsPDU
*pdu
, V9fsPath
*path
)
500 V9fsState
*s
= pdu
->s
;
501 V9fsFidState
*fidp
, head_fid
;
503 head_fid
.next
= s
->fid_list
;
504 for (fidp
= s
->fid_list
; fidp
; fidp
= fidp
->next
) {
505 if (fidp
->path
.size
!= path
->size
) {
508 if (!memcmp(fidp
->path
.data
, path
->data
, path
->size
)) {
509 /* Mark the fid non reclaimable. */
510 fidp
->flags
|= FID_NON_RECLAIMABLE
;
512 /* reopen the file/dir if already closed */
513 err
= v9fs_reopen_fid(pdu
, fidp
);
518 * Go back to head of fid list because
519 * the list could have got updated when
520 * switched to the worker thread
530 static void coroutine_fn
virtfs_reset(V9fsPDU
*pdu
)
532 V9fsState
*s
= pdu
->s
;
536 while (s
->fid_list
) {
542 s
->fid_list
= fidp
->next
;
549 #define P9_QID_TYPE_DIR 0x80
550 #define P9_QID_TYPE_SYMLINK 0x02
552 #define P9_STAT_MODE_DIR 0x80000000
553 #define P9_STAT_MODE_APPEND 0x40000000
554 #define P9_STAT_MODE_EXCL 0x20000000
555 #define P9_STAT_MODE_MOUNT 0x10000000
556 #define P9_STAT_MODE_AUTH 0x08000000
557 #define P9_STAT_MODE_TMP 0x04000000
558 #define P9_STAT_MODE_SYMLINK 0x02000000
559 #define P9_STAT_MODE_LINK 0x01000000
560 #define P9_STAT_MODE_DEVICE 0x00800000
561 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
562 #define P9_STAT_MODE_SOCKET 0x00100000
563 #define P9_STAT_MODE_SETUID 0x00080000
564 #define P9_STAT_MODE_SETGID 0x00040000
565 #define P9_STAT_MODE_SETVTX 0x00010000
567 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
568 P9_STAT_MODE_SYMLINK | \
569 P9_STAT_MODE_LINK | \
570 P9_STAT_MODE_DEVICE | \
571 P9_STAT_MODE_NAMED_PIPE | \
574 /* This is the algorithm from ufs in spfs */
575 static void stat_to_qid(const struct stat
*stbuf
, V9fsQID
*qidp
)
579 memset(&qidp
->path
, 0, sizeof(qidp
->path
));
580 size
= MIN(sizeof(stbuf
->st_ino
), sizeof(qidp
->path
));
581 memcpy(&qidp
->path
, &stbuf
->st_ino
, size
);
582 qidp
->version
= stbuf
->st_mtime
^ (stbuf
->st_size
<< 8);
584 if (S_ISDIR(stbuf
->st_mode
)) {
585 qidp
->type
|= P9_QID_TYPE_DIR
;
587 if (S_ISLNK(stbuf
->st_mode
)) {
588 qidp
->type
|= P9_QID_TYPE_SYMLINK
;
592 static int coroutine_fn
fid_to_qid(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
598 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
602 stat_to_qid(&stbuf
, qidp
);
606 V9fsPDU
*pdu_alloc(V9fsState
*s
)
610 if (!QLIST_EMPTY(&s
->free_list
)) {
611 pdu
= QLIST_FIRST(&s
->free_list
);
612 QLIST_REMOVE(pdu
, next
);
613 QLIST_INSERT_HEAD(&s
->active_list
, pdu
, next
);
618 void pdu_free(V9fsPDU
*pdu
)
620 V9fsState
*s
= pdu
->s
;
622 g_assert(!pdu
->cancelled
);
623 QLIST_REMOVE(pdu
, next
);
624 QLIST_INSERT_HEAD(&s
->free_list
, pdu
, next
);
627 static void coroutine_fn
pdu_complete(V9fsPDU
*pdu
, ssize_t len
)
629 int8_t id
= pdu
->id
+ 1; /* Response */
630 V9fsState
*s
= pdu
->s
;
637 if (s
->proto_version
!= V9FS_PROTO_2000L
) {
640 str
.data
= strerror(err
);
641 str
.size
= strlen(str
.data
);
643 ret
= pdu_marshal(pdu
, len
, "s", &str
);
651 ret
= pdu_marshal(pdu
, len
, "d", err
);
657 if (s
->proto_version
== V9FS_PROTO_2000L
) {
660 trace_v9fs_rerror(pdu
->tag
, pdu
->id
, err
); /* Trace ERROR */
663 /* fill out the header */
664 if (pdu_marshal(pdu
, 0, "dbw", (int32_t)len
, id
, pdu
->tag
) < 0) {
668 /* keep these in sync */
673 pdu
->s
->transport
->push_and_notify(pdu
);
675 /* Now wakeup anybody waiting in flush for this request */
676 if (!qemu_co_queue_next(&pdu
->complete
)) {
681 static mode_t
v9mode_to_mode(uint32_t mode
, V9fsString
*extension
)
686 if (mode
& P9_STAT_MODE_DIR
) {
690 if (mode
& P9_STAT_MODE_SYMLINK
) {
693 if (mode
& P9_STAT_MODE_SOCKET
) {
696 if (mode
& P9_STAT_MODE_NAMED_PIPE
) {
699 if (mode
& P9_STAT_MODE_DEVICE
) {
700 if (extension
->size
&& extension
->data
[0] == 'c') {
711 if (mode
& P9_STAT_MODE_SETUID
) {
714 if (mode
& P9_STAT_MODE_SETGID
) {
717 if (mode
& P9_STAT_MODE_SETVTX
) {
724 static int donttouch_stat(V9fsStat
*stat
)
726 if (stat
->type
== -1 &&
728 stat
->qid
.type
== -1 &&
729 stat
->qid
.version
== -1 &&
730 stat
->qid
.path
== -1 &&
734 stat
->length
== -1 &&
741 stat
->n_muid
== -1) {
748 static void v9fs_stat_init(V9fsStat
*stat
)
750 v9fs_string_init(&stat
->name
);
751 v9fs_string_init(&stat
->uid
);
752 v9fs_string_init(&stat
->gid
);
753 v9fs_string_init(&stat
->muid
);
754 v9fs_string_init(&stat
->extension
);
757 static void v9fs_stat_free(V9fsStat
*stat
)
759 v9fs_string_free(&stat
->name
);
760 v9fs_string_free(&stat
->uid
);
761 v9fs_string_free(&stat
->gid
);
762 v9fs_string_free(&stat
->muid
);
763 v9fs_string_free(&stat
->extension
);
766 static uint32_t stat_to_v9mode(const struct stat
*stbuf
)
770 mode
= stbuf
->st_mode
& 0777;
771 if (S_ISDIR(stbuf
->st_mode
)) {
772 mode
|= P9_STAT_MODE_DIR
;
775 if (S_ISLNK(stbuf
->st_mode
)) {
776 mode
|= P9_STAT_MODE_SYMLINK
;
779 if (S_ISSOCK(stbuf
->st_mode
)) {
780 mode
|= P9_STAT_MODE_SOCKET
;
783 if (S_ISFIFO(stbuf
->st_mode
)) {
784 mode
|= P9_STAT_MODE_NAMED_PIPE
;
787 if (S_ISBLK(stbuf
->st_mode
) || S_ISCHR(stbuf
->st_mode
)) {
788 mode
|= P9_STAT_MODE_DEVICE
;
791 if (stbuf
->st_mode
& S_ISUID
) {
792 mode
|= P9_STAT_MODE_SETUID
;
795 if (stbuf
->st_mode
& S_ISGID
) {
796 mode
|= P9_STAT_MODE_SETGID
;
799 if (stbuf
->st_mode
& S_ISVTX
) {
800 mode
|= P9_STAT_MODE_SETVTX
;
806 static int coroutine_fn
stat_to_v9stat(V9fsPDU
*pdu
, V9fsPath
*name
,
807 const struct stat
*stbuf
,
813 memset(v9stat
, 0, sizeof(*v9stat
));
815 stat_to_qid(stbuf
, &v9stat
->qid
);
816 v9stat
->mode
= stat_to_v9mode(stbuf
);
817 v9stat
->atime
= stbuf
->st_atime
;
818 v9stat
->mtime
= stbuf
->st_mtime
;
819 v9stat
->length
= stbuf
->st_size
;
821 v9fs_string_free(&v9stat
->uid
);
822 v9fs_string_free(&v9stat
->gid
);
823 v9fs_string_free(&v9stat
->muid
);
825 v9stat
->n_uid
= stbuf
->st_uid
;
826 v9stat
->n_gid
= stbuf
->st_gid
;
829 v9fs_string_free(&v9stat
->extension
);
831 if (v9stat
->mode
& P9_STAT_MODE_SYMLINK
) {
832 err
= v9fs_co_readlink(pdu
, name
, &v9stat
->extension
);
836 } else if (v9stat
->mode
& P9_STAT_MODE_DEVICE
) {
837 v9fs_string_sprintf(&v9stat
->extension
, "%c %u %u",
838 S_ISCHR(stbuf
->st_mode
) ? 'c' : 'b',
839 major(stbuf
->st_rdev
), minor(stbuf
->st_rdev
));
840 } else if (S_ISDIR(stbuf
->st_mode
) || S_ISREG(stbuf
->st_mode
)) {
841 v9fs_string_sprintf(&v9stat
->extension
, "%s %lu",
842 "HARDLINKCOUNT", (unsigned long)stbuf
->st_nlink
);
845 str
= strrchr(name
->data
, '/');
852 v9fs_string_sprintf(&v9stat
->name
, "%s", str
);
855 v9fs_string_size(&v9stat
->name
) +
856 v9fs_string_size(&v9stat
->uid
) +
857 v9fs_string_size(&v9stat
->gid
) +
858 v9fs_string_size(&v9stat
->muid
) +
859 v9fs_string_size(&v9stat
->extension
);
863 #define P9_STATS_MODE 0x00000001ULL
864 #define P9_STATS_NLINK 0x00000002ULL
865 #define P9_STATS_UID 0x00000004ULL
866 #define P9_STATS_GID 0x00000008ULL
867 #define P9_STATS_RDEV 0x00000010ULL
868 #define P9_STATS_ATIME 0x00000020ULL
869 #define P9_STATS_MTIME 0x00000040ULL
870 #define P9_STATS_CTIME 0x00000080ULL
871 #define P9_STATS_INO 0x00000100ULL
872 #define P9_STATS_SIZE 0x00000200ULL
873 #define P9_STATS_BLOCKS 0x00000400ULL
875 #define P9_STATS_BTIME 0x00000800ULL
876 #define P9_STATS_GEN 0x00001000ULL
877 #define P9_STATS_DATA_VERSION 0x00002000ULL
879 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
880 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
883 static void stat_to_v9stat_dotl(V9fsState
*s
, const struct stat
*stbuf
,
884 V9fsStatDotl
*v9lstat
)
886 memset(v9lstat
, 0, sizeof(*v9lstat
));
888 v9lstat
->st_mode
= stbuf
->st_mode
;
889 v9lstat
->st_nlink
= stbuf
->st_nlink
;
890 v9lstat
->st_uid
= stbuf
->st_uid
;
891 v9lstat
->st_gid
= stbuf
->st_gid
;
892 v9lstat
->st_rdev
= stbuf
->st_rdev
;
893 v9lstat
->st_size
= stbuf
->st_size
;
894 v9lstat
->st_blksize
= stbuf
->st_blksize
;
895 v9lstat
->st_blocks
= stbuf
->st_blocks
;
896 v9lstat
->st_atime_sec
= stbuf
->st_atime
;
897 v9lstat
->st_atime_nsec
= stbuf
->st_atim
.tv_nsec
;
898 v9lstat
->st_mtime_sec
= stbuf
->st_mtime
;
899 v9lstat
->st_mtime_nsec
= stbuf
->st_mtim
.tv_nsec
;
900 v9lstat
->st_ctime_sec
= stbuf
->st_ctime
;
901 v9lstat
->st_ctime_nsec
= stbuf
->st_ctim
.tv_nsec
;
902 /* Currently we only support BASIC fields in stat */
903 v9lstat
->st_result_mask
= P9_STATS_BASIC
;
905 stat_to_qid(stbuf
, &v9lstat
->qid
);
908 static void print_sg(struct iovec
*sg
, int cnt
)
912 printf("sg[%d]: {", cnt
);
913 for (i
= 0; i
< cnt
; i
++) {
917 printf("(%p, %zd)", sg
[i
].iov_base
, sg
[i
].iov_len
);
922 /* Will call this only for path name based fid */
923 static void v9fs_fix_path(V9fsPath
*dst
, V9fsPath
*src
, int len
)
926 v9fs_path_init(&str
);
927 v9fs_path_copy(&str
, dst
);
928 v9fs_path_sprintf(dst
, "%s%s", src
->data
, str
.data
+ len
);
929 v9fs_path_free(&str
);
932 static inline bool is_ro_export(FsContext
*ctx
)
934 return ctx
->export_flags
& V9FS_RDONLY
;
937 static void coroutine_fn
v9fs_version(void *opaque
)
940 V9fsPDU
*pdu
= opaque
;
941 V9fsState
*s
= pdu
->s
;
945 v9fs_string_init(&version
);
946 err
= pdu_unmarshal(pdu
, offset
, "ds", &s
->msize
, &version
);
951 trace_v9fs_version(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
955 if (!strcmp(version
.data
, "9P2000.u")) {
956 s
->proto_version
= V9FS_PROTO_2000U
;
957 } else if (!strcmp(version
.data
, "9P2000.L")) {
958 s
->proto_version
= V9FS_PROTO_2000L
;
960 v9fs_string_sprintf(&version
, "unknown");
963 err
= pdu_marshal(pdu
, offset
, "ds", s
->msize
, &version
);
969 trace_v9fs_version_return(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
971 pdu_complete(pdu
, offset
);
972 v9fs_string_free(&version
);
975 static void coroutine_fn
v9fs_attach(void *opaque
)
977 V9fsPDU
*pdu
= opaque
;
978 V9fsState
*s
= pdu
->s
;
979 int32_t fid
, afid
, n_uname
;
980 V9fsString uname
, aname
;
985 Error
*local_err
= NULL
;
987 v9fs_string_init(&uname
);
988 v9fs_string_init(&aname
);
989 err
= pdu_unmarshal(pdu
, offset
, "ddssd", &fid
,
990 &afid
, &uname
, &aname
, &n_uname
);
994 trace_v9fs_attach(pdu
->tag
, pdu
->id
, fid
, afid
, uname
.data
, aname
.data
);
996 fidp
= alloc_fid(s
, fid
);
1001 fidp
->uid
= n_uname
;
1002 err
= v9fs_co_name_to_path(pdu
, NULL
, "/", &fidp
->path
);
1008 err
= fid_to_qid(pdu
, fidp
, &qid
);
1016 * disable migration if we haven't done already.
1017 * attach could get called multiple times for the same export.
1019 if (!s
->migration_blocker
) {
1020 error_setg(&s
->migration_blocker
,
1021 "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
1022 s
->ctx
.fs_root
? s
->ctx
.fs_root
: "NULL", s
->tag
);
1023 err
= migrate_add_blocker(s
->migration_blocker
, &local_err
);
1025 error_free(local_err
);
1026 error_free(s
->migration_blocker
);
1027 s
->migration_blocker
= NULL
;
1034 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
1041 memcpy(&s
->root_qid
, &qid
, sizeof(qid
));
1042 trace_v9fs_attach_return(pdu
->tag
, pdu
->id
,
1043 qid
.type
, qid
.version
, qid
.path
);
1047 pdu_complete(pdu
, err
);
1048 v9fs_string_free(&uname
);
1049 v9fs_string_free(&aname
);
1052 static void coroutine_fn
v9fs_stat(void *opaque
)
1060 V9fsPDU
*pdu
= opaque
;
1062 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
1066 trace_v9fs_stat(pdu
->tag
, pdu
->id
, fid
);
1068 fidp
= get_fid(pdu
, fid
);
1073 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1077 err
= stat_to_v9stat(pdu
, &fidp
->path
, &stbuf
, &v9stat
);
1081 err
= pdu_marshal(pdu
, offset
, "wS", 0, &v9stat
);
1083 v9fs_stat_free(&v9stat
);
1086 trace_v9fs_stat_return(pdu
->tag
, pdu
->id
, v9stat
.mode
,
1087 v9stat
.atime
, v9stat
.mtime
, v9stat
.length
);
1089 v9fs_stat_free(&v9stat
);
1093 pdu_complete(pdu
, err
);
1096 static void coroutine_fn
v9fs_getattr(void *opaque
)
1103 uint64_t request_mask
;
1104 V9fsStatDotl v9stat_dotl
;
1105 V9fsPDU
*pdu
= opaque
;
1106 V9fsState
*s
= pdu
->s
;
1108 retval
= pdu_unmarshal(pdu
, offset
, "dq", &fid
, &request_mask
);
1112 trace_v9fs_getattr(pdu
->tag
, pdu
->id
, fid
, request_mask
);
1114 fidp
= get_fid(pdu
, fid
);
1120 * Currently we only support BASIC fields in stat, so there is no
1121 * need to look at request_mask.
1123 retval
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1127 stat_to_v9stat_dotl(s
, &stbuf
, &v9stat_dotl
);
1129 /* fill st_gen if requested and supported by underlying fs */
1130 if (request_mask
& P9_STATS_GEN
) {
1131 retval
= v9fs_co_st_gen(pdu
, &fidp
->path
, stbuf
.st_mode
, &v9stat_dotl
);
1134 /* we have valid st_gen: update result mask */
1135 v9stat_dotl
.st_result_mask
|= P9_STATS_GEN
;
1138 /* request cancelled, e.g. by Tflush */
1141 /* failed to get st_gen: not fatal, ignore */
1145 retval
= pdu_marshal(pdu
, offset
, "A", &v9stat_dotl
);
1150 trace_v9fs_getattr_return(pdu
->tag
, pdu
->id
, v9stat_dotl
.st_result_mask
,
1151 v9stat_dotl
.st_mode
, v9stat_dotl
.st_uid
,
1152 v9stat_dotl
.st_gid
);
1156 pdu_complete(pdu
, retval
);
1159 /* Attribute flags */
1160 #define P9_ATTR_MODE (1 << 0)
1161 #define P9_ATTR_UID (1 << 1)
1162 #define P9_ATTR_GID (1 << 2)
1163 #define P9_ATTR_SIZE (1 << 3)
1164 #define P9_ATTR_ATIME (1 << 4)
1165 #define P9_ATTR_MTIME (1 << 5)
1166 #define P9_ATTR_CTIME (1 << 6)
1167 #define P9_ATTR_ATIME_SET (1 << 7)
1168 #define P9_ATTR_MTIME_SET (1 << 8)
1170 #define P9_ATTR_MASK 127
1172 static void coroutine_fn
v9fs_setattr(void *opaque
)
1179 V9fsPDU
*pdu
= opaque
;
1181 err
= pdu_unmarshal(pdu
, offset
, "dI", &fid
, &v9iattr
);
1186 fidp
= get_fid(pdu
, fid
);
1191 if (v9iattr
.valid
& P9_ATTR_MODE
) {
1192 err
= v9fs_co_chmod(pdu
, &fidp
->path
, v9iattr
.mode
);
1197 if (v9iattr
.valid
& (P9_ATTR_ATIME
| P9_ATTR_MTIME
)) {
1198 struct timespec times
[2];
1199 if (v9iattr
.valid
& P9_ATTR_ATIME
) {
1200 if (v9iattr
.valid
& P9_ATTR_ATIME_SET
) {
1201 times
[0].tv_sec
= v9iattr
.atime_sec
;
1202 times
[0].tv_nsec
= v9iattr
.atime_nsec
;
1204 times
[0].tv_nsec
= UTIME_NOW
;
1207 times
[0].tv_nsec
= UTIME_OMIT
;
1209 if (v9iattr
.valid
& P9_ATTR_MTIME
) {
1210 if (v9iattr
.valid
& P9_ATTR_MTIME_SET
) {
1211 times
[1].tv_sec
= v9iattr
.mtime_sec
;
1212 times
[1].tv_nsec
= v9iattr
.mtime_nsec
;
1214 times
[1].tv_nsec
= UTIME_NOW
;
1217 times
[1].tv_nsec
= UTIME_OMIT
;
1219 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
1225 * If the only valid entry in iattr is ctime we can call
1226 * chown(-1,-1) to update the ctime of the file
1228 if ((v9iattr
.valid
& (P9_ATTR_UID
| P9_ATTR_GID
)) ||
1229 ((v9iattr
.valid
& P9_ATTR_CTIME
)
1230 && !((v9iattr
.valid
& P9_ATTR_MASK
) & ~P9_ATTR_CTIME
))) {
1231 if (!(v9iattr
.valid
& P9_ATTR_UID
)) {
1234 if (!(v9iattr
.valid
& P9_ATTR_GID
)) {
1237 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9iattr
.uid
,
1243 if (v9iattr
.valid
& (P9_ATTR_SIZE
)) {
1244 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9iattr
.size
);
1253 pdu_complete(pdu
, err
);
1256 static int v9fs_walk_marshal(V9fsPDU
*pdu
, uint16_t nwnames
, V9fsQID
*qids
)
1262 err
= pdu_marshal(pdu
, offset
, "w", nwnames
);
1267 for (i
= 0; i
< nwnames
; i
++) {
1268 err
= pdu_marshal(pdu
, offset
, "Q", &qids
[i
]);
1277 static bool name_is_illegal(const char *name
)
1279 return !*name
|| strchr(name
, '/') != NULL
;
1282 static bool not_same_qid(const V9fsQID
*qid1
, const V9fsQID
*qid2
)
1285 qid1
->type
!= qid2
->type
||
1286 qid1
->version
!= qid2
->version
||
1287 qid1
->path
!= qid2
->path
;
1290 static void coroutine_fn
v9fs_walk(void *opaque
)
1293 V9fsQID
*qids
= NULL
;
1295 V9fsPath dpath
, path
;
1299 int32_t fid
, newfid
;
1300 V9fsString
*wnames
= NULL
;
1302 V9fsFidState
*newfidp
= NULL
;
1303 V9fsPDU
*pdu
= opaque
;
1304 V9fsState
*s
= pdu
->s
;
1307 err
= pdu_unmarshal(pdu
, offset
, "ddw", &fid
, &newfid
, &nwnames
);
1309 pdu_complete(pdu
, err
);
1314 trace_v9fs_walk(pdu
->tag
, pdu
->id
, fid
, newfid
, nwnames
);
1316 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1317 wnames
= g_malloc0(sizeof(wnames
[0]) * nwnames
);
1318 qids
= g_malloc0(sizeof(qids
[0]) * nwnames
);
1319 for (i
= 0; i
< nwnames
; i
++) {
1320 err
= pdu_unmarshal(pdu
, offset
, "s", &wnames
[i
]);
1324 if (name_is_illegal(wnames
[i
].data
)) {
1330 } else if (nwnames
> P9_MAXWELEM
) {
1334 fidp
= get_fid(pdu
, fid
);
1340 v9fs_path_init(&dpath
);
1341 v9fs_path_init(&path
);
1343 err
= fid_to_qid(pdu
, fidp
, &qid
);
1349 * Both dpath and path initially poin to fidp.
1350 * Needed to handle request with nwnames == 0
1352 v9fs_path_copy(&dpath
, &fidp
->path
);
1353 v9fs_path_copy(&path
, &fidp
->path
);
1354 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1355 if (not_same_qid(&pdu
->s
->root_qid
, &qid
) ||
1356 strcmp("..", wnames
[name_idx
].data
)) {
1357 err
= v9fs_co_name_to_path(pdu
, &dpath
, wnames
[name_idx
].data
,
1363 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1367 stat_to_qid(&stbuf
, &qid
);
1368 v9fs_path_copy(&dpath
, &path
);
1370 memcpy(&qids
[name_idx
], &qid
, sizeof(qid
));
1372 if (fid
== newfid
) {
1373 if (fidp
->fid_type
!= P9_FID_NONE
) {
1377 v9fs_path_copy(&fidp
->path
, &path
);
1379 newfidp
= alloc_fid(s
, newfid
);
1380 if (newfidp
== NULL
) {
1384 newfidp
->uid
= fidp
->uid
;
1385 v9fs_path_copy(&newfidp
->path
, &path
);
1387 err
= v9fs_walk_marshal(pdu
, nwnames
, qids
);
1388 trace_v9fs_walk_return(pdu
->tag
, pdu
->id
, nwnames
, qids
);
1392 put_fid(pdu
, newfidp
);
1394 v9fs_path_free(&dpath
);
1395 v9fs_path_free(&path
);
1397 pdu_complete(pdu
, err
);
1398 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1399 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1400 v9fs_string_free(&wnames
[name_idx
]);
1407 static int32_t coroutine_fn
get_iounit(V9fsPDU
*pdu
, V9fsPath
*path
)
1409 struct statfs stbuf
;
1411 V9fsState
*s
= pdu
->s
;
1414 * iounit should be multiples of f_bsize (host filesystem block size
1415 * and as well as less than (client msize - P9_IOHDRSZ))
1417 if (!v9fs_co_statfs(pdu
, path
, &stbuf
)) {
1418 iounit
= stbuf
.f_bsize
;
1419 iounit
*= (s
->msize
- P9_IOHDRSZ
)/stbuf
.f_bsize
;
1422 iounit
= s
->msize
- P9_IOHDRSZ
;
1427 static void coroutine_fn
v9fs_open(void *opaque
)
1438 V9fsPDU
*pdu
= opaque
;
1439 V9fsState
*s
= pdu
->s
;
1441 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1442 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &mode
);
1445 err
= pdu_unmarshal(pdu
, offset
, "db", &fid
, &modebyte
);
1451 trace_v9fs_open(pdu
->tag
, pdu
->id
, fid
, mode
);
1453 fidp
= get_fid(pdu
, fid
);
1458 if (fidp
->fid_type
!= P9_FID_NONE
) {
1463 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1467 stat_to_qid(&stbuf
, &qid
);
1468 if (S_ISDIR(stbuf
.st_mode
)) {
1469 err
= v9fs_co_opendir(pdu
, fidp
);
1473 fidp
->fid_type
= P9_FID_DIR
;
1474 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, 0);
1480 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1481 flags
= get_dotl_openflags(s
, mode
);
1483 flags
= omode_to_uflags(mode
);
1485 if (is_ro_export(&s
->ctx
)) {
1486 if (mode
& O_WRONLY
|| mode
& O_RDWR
||
1487 mode
& O_APPEND
|| mode
& O_TRUNC
) {
1492 err
= v9fs_co_open(pdu
, fidp
, flags
);
1496 fidp
->fid_type
= P9_FID_FILE
;
1497 fidp
->open_flags
= flags
;
1498 if (flags
& O_EXCL
) {
1500 * We let the host file system do O_EXCL check
1501 * We should not reclaim such fd
1503 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1505 iounit
= get_iounit(pdu
, &fidp
->path
);
1506 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1512 trace_v9fs_open_return(pdu
->tag
, pdu
->id
,
1513 qid
.type
, qid
.version
, qid
.path
, iounit
);
1517 pdu_complete(pdu
, err
);
1520 static void coroutine_fn
v9fs_lcreate(void *opaque
)
1522 int32_t dfid
, flags
, mode
;
1531 V9fsPDU
*pdu
= opaque
;
1533 v9fs_string_init(&name
);
1534 err
= pdu_unmarshal(pdu
, offset
, "dsddd", &dfid
,
1535 &name
, &flags
, &mode
, &gid
);
1539 trace_v9fs_lcreate(pdu
->tag
, pdu
->id
, dfid
, flags
, mode
, gid
);
1541 if (name_is_illegal(name
.data
)) {
1546 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
1551 fidp
= get_fid(pdu
, dfid
);
1556 if (fidp
->fid_type
!= P9_FID_NONE
) {
1561 flags
= get_dotl_openflags(pdu
->s
, flags
);
1562 err
= v9fs_co_open2(pdu
, fidp
, &name
, gid
,
1563 flags
| O_CREAT
, mode
, &stbuf
);
1567 fidp
->fid_type
= P9_FID_FILE
;
1568 fidp
->open_flags
= flags
;
1569 if (flags
& O_EXCL
) {
1571 * We let the host file system do O_EXCL check
1572 * We should not reclaim such fd
1574 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1576 iounit
= get_iounit(pdu
, &fidp
->path
);
1577 stat_to_qid(&stbuf
, &qid
);
1578 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1583 trace_v9fs_lcreate_return(pdu
->tag
, pdu
->id
,
1584 qid
.type
, qid
.version
, qid
.path
, iounit
);
1588 pdu_complete(pdu
, err
);
1589 v9fs_string_free(&name
);
1592 static void coroutine_fn
v9fs_fsync(void *opaque
)
1599 V9fsPDU
*pdu
= opaque
;
1601 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &datasync
);
1605 trace_v9fs_fsync(pdu
->tag
, pdu
->id
, fid
, datasync
);
1607 fidp
= get_fid(pdu
, fid
);
1612 err
= v9fs_co_fsync(pdu
, fidp
, datasync
);
1618 pdu_complete(pdu
, err
);
1621 static void coroutine_fn
v9fs_clunk(void *opaque
)
1627 V9fsPDU
*pdu
= opaque
;
1628 V9fsState
*s
= pdu
->s
;
1630 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
1634 trace_v9fs_clunk(pdu
->tag
, pdu
->id
, fid
);
1636 fidp
= clunk_fid(s
, fid
);
1642 * Bump the ref so that put_fid will
1646 err
= put_fid(pdu
, fidp
);
1651 pdu_complete(pdu
, err
);
1655 * Create a QEMUIOVector for a sub-region of PDU iovecs
1657 * @qiov: uninitialized QEMUIOVector
1658 * @skip: number of bytes to skip from beginning of PDU
1659 * @size: number of bytes to include
1660 * @is_write: true - write, false - read
1662 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
1663 * with qemu_iovec_destroy().
1665 static void v9fs_init_qiov_from_pdu(QEMUIOVector
*qiov
, V9fsPDU
*pdu
,
1666 size_t skip
, size_t size
,
1674 pdu
->s
->transport
->init_out_iov_from_pdu(pdu
, &iov
, &niov
, size
+ skip
);
1676 pdu
->s
->transport
->init_in_iov_from_pdu(pdu
, &iov
, &niov
, size
+ skip
);
1679 qemu_iovec_init_external(&elem
, iov
, niov
);
1680 qemu_iovec_init(qiov
, niov
);
1681 qemu_iovec_concat(qiov
, &elem
, skip
, size
);
1684 static int v9fs_xattr_read(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1685 uint64_t off
, uint32_t max_count
)
1689 uint64_t read_count
;
1690 QEMUIOVector qiov_full
;
1692 if (fidp
->fs
.xattr
.len
< off
) {
1695 read_count
= fidp
->fs
.xattr
.len
- off
;
1697 if (read_count
> max_count
) {
1698 read_count
= max_count
;
1700 err
= pdu_marshal(pdu
, offset
, "d", read_count
);
1706 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, read_count
, false);
1707 err
= v9fs_pack(qiov_full
.iov
, qiov_full
.niov
, 0,
1708 ((char *)fidp
->fs
.xattr
.value
) + off
,
1710 qemu_iovec_destroy(&qiov_full
);
1718 static int coroutine_fn
v9fs_do_readdir_with_stat(V9fsPDU
*pdu
,
1727 off_t saved_dir_pos
;
1728 struct dirent
*dent
;
1730 /* save the directory position */
1731 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1732 if (saved_dir_pos
< 0) {
1733 return saved_dir_pos
;
1737 v9fs_path_init(&path
);
1739 v9fs_readdir_lock(&fidp
->fs
.dir
);
1741 err
= v9fs_co_readdir(pdu
, fidp
, &dent
);
1745 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, dent
->d_name
, &path
);
1749 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1753 err
= stat_to_v9stat(pdu
, &path
, &stbuf
, &v9stat
);
1757 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1758 len
= pdu_marshal(pdu
, 11 + count
, "S", &v9stat
);
1760 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1762 if ((len
!= (v9stat
.size
+ 2)) || ((count
+ len
) > max_count
)) {
1763 /* Ran out of buffer. Set dir back to old position and return */
1764 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1765 v9fs_stat_free(&v9stat
);
1766 v9fs_path_free(&path
);
1770 v9fs_stat_free(&v9stat
);
1771 v9fs_path_free(&path
);
1772 saved_dir_pos
= dent
->d_off
;
1775 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1777 v9fs_path_free(&path
);
1784 static void coroutine_fn
v9fs_read(void *opaque
)
1793 V9fsPDU
*pdu
= opaque
;
1794 V9fsState
*s
= pdu
->s
;
1796 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &max_count
);
1800 trace_v9fs_read(pdu
->tag
, pdu
->id
, fid
, off
, max_count
);
1802 fidp
= get_fid(pdu
, fid
);
1807 if (fidp
->fid_type
== P9_FID_DIR
) {
1810 v9fs_co_rewinddir(pdu
, fidp
);
1812 count
= v9fs_do_readdir_with_stat(pdu
, fidp
, max_count
);
1817 err
= pdu_marshal(pdu
, offset
, "d", count
);
1821 err
+= offset
+ count
;
1822 } else if (fidp
->fid_type
== P9_FID_FILE
) {
1823 QEMUIOVector qiov_full
;
1827 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
+ 4, max_count
, false);
1828 qemu_iovec_init(&qiov
, qiov_full
.niov
);
1830 qemu_iovec_reset(&qiov
);
1831 qemu_iovec_concat(&qiov
, &qiov_full
, count
, qiov_full
.size
- count
);
1833 print_sg(qiov
.iov
, qiov
.niov
);
1835 /* Loop in case of EINTR */
1837 len
= v9fs_co_preadv(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
1842 } while (len
== -EINTR
&& !pdu
->cancelled
);
1844 /* IO error return the error */
1846 goto out_free_iovec
;
1848 } while (count
< max_count
&& len
> 0);
1849 err
= pdu_marshal(pdu
, offset
, "d", count
);
1851 goto out_free_iovec
;
1853 err
+= offset
+ count
;
1855 qemu_iovec_destroy(&qiov
);
1856 qemu_iovec_destroy(&qiov_full
);
1857 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
1858 err
= v9fs_xattr_read(s
, pdu
, fidp
, off
, max_count
);
1862 trace_v9fs_read_return(pdu
->tag
, pdu
->id
, count
, err
);
1866 pdu_complete(pdu
, err
);
1869 static size_t v9fs_readdir_data_size(V9fsString
*name
)
1872 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1873 * size of type (1) + size of name.size (2) + strlen(name.data)
1875 return 24 + v9fs_string_size(name
);
1878 static int coroutine_fn
v9fs_do_readdir(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1886 off_t saved_dir_pos
;
1887 struct dirent
*dent
;
1889 /* save the directory position */
1890 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1891 if (saved_dir_pos
< 0) {
1892 return saved_dir_pos
;
1896 v9fs_readdir_lock(&fidp
->fs
.dir
);
1898 err
= v9fs_co_readdir(pdu
, fidp
, &dent
);
1902 v9fs_string_init(&name
);
1903 v9fs_string_sprintf(&name
, "%s", dent
->d_name
);
1904 if ((count
+ v9fs_readdir_data_size(&name
)) > max_count
) {
1905 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1907 /* Ran out of buffer. Set dir back to old position and return */
1908 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1909 v9fs_string_free(&name
);
1913 * Fill up just the path field of qid because the client uses
1914 * only that. To fill the entire qid structure we will have
1915 * to stat each dirent found, which is expensive
1917 size
= MIN(sizeof(dent
->d_ino
), sizeof(qid
.path
));
1918 memcpy(&qid
.path
, &dent
->d_ino
, size
);
1919 /* Fill the other fields with dummy values */
1923 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1924 len
= pdu_marshal(pdu
, 11 + count
, "Qqbs",
1926 dent
->d_type
, &name
);
1928 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1931 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1932 v9fs_string_free(&name
);
1936 v9fs_string_free(&name
);
1937 saved_dir_pos
= dent
->d_off
;
1940 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1948 static void coroutine_fn
v9fs_readdir(void *opaque
)
1954 uint64_t initial_offset
;
1957 V9fsPDU
*pdu
= opaque
;
1959 retval
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
,
1960 &initial_offset
, &max_count
);
1964 trace_v9fs_readdir(pdu
->tag
, pdu
->id
, fid
, initial_offset
, max_count
);
1966 fidp
= get_fid(pdu
, fid
);
1971 if (!fidp
->fs
.dir
.stream
) {
1975 if (initial_offset
== 0) {
1976 v9fs_co_rewinddir(pdu
, fidp
);
1978 v9fs_co_seekdir(pdu
, fidp
, initial_offset
);
1980 count
= v9fs_do_readdir(pdu
, fidp
, max_count
);
1985 retval
= pdu_marshal(pdu
, offset
, "d", count
);
1989 retval
+= count
+ offset
;
1990 trace_v9fs_readdir_return(pdu
->tag
, pdu
->id
, count
, retval
);
1994 pdu_complete(pdu
, retval
);
1997 static int v9fs_xattr_write(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1998 uint64_t off
, uint32_t count
,
1999 struct iovec
*sg
, int cnt
)
2003 uint64_t write_count
;
2007 if (fidp
->fs
.xattr
.len
< off
) {
2011 write_count
= fidp
->fs
.xattr
.len
- off
;
2012 if (write_count
> count
) {
2013 write_count
= count
;
2015 err
= pdu_marshal(pdu
, offset
, "d", write_count
);
2020 fidp
->fs
.xattr
.copied_len
+= write_count
;
2022 * Now copy the content from sg list
2024 for (i
= 0; i
< cnt
; i
++) {
2025 if (write_count
> sg
[i
].iov_len
) {
2026 to_copy
= sg
[i
].iov_len
;
2028 to_copy
= write_count
;
2030 memcpy((char *)fidp
->fs
.xattr
.value
+ off
, sg
[i
].iov_base
, to_copy
);
2031 /* updating vs->off since we are not using below */
2033 write_count
-= to_copy
;
2039 static void coroutine_fn
v9fs_write(void *opaque
)
2049 V9fsPDU
*pdu
= opaque
;
2050 V9fsState
*s
= pdu
->s
;
2051 QEMUIOVector qiov_full
;
2054 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &count
);
2056 pdu_complete(pdu
, err
);
2060 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, count
, true);
2061 trace_v9fs_write(pdu
->tag
, pdu
->id
, fid
, off
, count
, qiov_full
.niov
);
2063 fidp
= get_fid(pdu
, fid
);
2068 if (fidp
->fid_type
== P9_FID_FILE
) {
2069 if (fidp
->fs
.fd
== -1) {
2073 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
2075 * setxattr operation
2077 err
= v9fs_xattr_write(s
, pdu
, fidp
, off
, count
,
2078 qiov_full
.iov
, qiov_full
.niov
);
2084 qemu_iovec_init(&qiov
, qiov_full
.niov
);
2086 qemu_iovec_reset(&qiov
);
2087 qemu_iovec_concat(&qiov
, &qiov_full
, total
, qiov_full
.size
- total
);
2089 print_sg(qiov
.iov
, qiov
.niov
);
2091 /* Loop in case of EINTR */
2093 len
= v9fs_co_pwritev(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
2098 } while (len
== -EINTR
&& !pdu
->cancelled
);
2100 /* IO error return the error */
2104 } while (total
< count
&& len
> 0);
2107 err
= pdu_marshal(pdu
, offset
, "d", total
);
2112 trace_v9fs_write_return(pdu
->tag
, pdu
->id
, total
, err
);
2114 qemu_iovec_destroy(&qiov
);
2118 qemu_iovec_destroy(&qiov_full
);
2119 pdu_complete(pdu
, err
);
2122 static void coroutine_fn
v9fs_create(void *opaque
)
2134 V9fsString extension
;
2136 V9fsPDU
*pdu
= opaque
;
2138 v9fs_path_init(&path
);
2139 v9fs_string_init(&name
);
2140 v9fs_string_init(&extension
);
2141 err
= pdu_unmarshal(pdu
, offset
, "dsdbs", &fid
, &name
,
2142 &perm
, &mode
, &extension
);
2146 trace_v9fs_create(pdu
->tag
, pdu
->id
, fid
, name
.data
, perm
, mode
);
2148 if (name_is_illegal(name
.data
)) {
2153 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2158 fidp
= get_fid(pdu
, fid
);
2163 if (fidp
->fid_type
!= P9_FID_NONE
) {
2167 if (perm
& P9_STAT_MODE_DIR
) {
2168 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, perm
& 0777,
2169 fidp
->uid
, -1, &stbuf
);
2173 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2177 v9fs_path_copy(&fidp
->path
, &path
);
2178 err
= v9fs_co_opendir(pdu
, fidp
);
2182 fidp
->fid_type
= P9_FID_DIR
;
2183 } else if (perm
& P9_STAT_MODE_SYMLINK
) {
2184 err
= v9fs_co_symlink(pdu
, fidp
, &name
,
2185 extension
.data
, -1 , &stbuf
);
2189 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2193 v9fs_path_copy(&fidp
->path
, &path
);
2194 } else if (perm
& P9_STAT_MODE_LINK
) {
2195 int32_t ofid
= atoi(extension
.data
);
2196 V9fsFidState
*ofidp
= get_fid(pdu
, ofid
);
2197 if (ofidp
== NULL
) {
2201 err
= v9fs_co_link(pdu
, ofidp
, fidp
, &name
);
2202 put_fid(pdu
, ofidp
);
2206 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2208 fidp
->fid_type
= P9_FID_NONE
;
2211 v9fs_path_copy(&fidp
->path
, &path
);
2212 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2214 fidp
->fid_type
= P9_FID_NONE
;
2217 } else if (perm
& P9_STAT_MODE_DEVICE
) {
2219 uint32_t major
, minor
;
2222 if (sscanf(extension
.data
, "%c %u %u", &ctype
, &major
, &minor
) != 3) {
2239 nmode
|= perm
& 0777;
2240 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2241 makedev(major
, minor
), nmode
, &stbuf
);
2245 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2249 v9fs_path_copy(&fidp
->path
, &path
);
2250 } else if (perm
& P9_STAT_MODE_NAMED_PIPE
) {
2251 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2252 0, S_IFIFO
| (perm
& 0777), &stbuf
);
2256 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2260 v9fs_path_copy(&fidp
->path
, &path
);
2261 } else if (perm
& P9_STAT_MODE_SOCKET
) {
2262 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2263 0, S_IFSOCK
| (perm
& 0777), &stbuf
);
2267 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2271 v9fs_path_copy(&fidp
->path
, &path
);
2273 err
= v9fs_co_open2(pdu
, fidp
, &name
, -1,
2274 omode_to_uflags(mode
)|O_CREAT
, perm
, &stbuf
);
2278 fidp
->fid_type
= P9_FID_FILE
;
2279 fidp
->open_flags
= omode_to_uflags(mode
);
2280 if (fidp
->open_flags
& O_EXCL
) {
2282 * We let the host file system do O_EXCL check
2283 * We should not reclaim such fd
2285 fidp
->flags
|= FID_NON_RECLAIMABLE
;
2288 iounit
= get_iounit(pdu
, &fidp
->path
);
2289 stat_to_qid(&stbuf
, &qid
);
2290 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
2295 trace_v9fs_create_return(pdu
->tag
, pdu
->id
,
2296 qid
.type
, qid
.version
, qid
.path
, iounit
);
2300 pdu_complete(pdu
, err
);
2301 v9fs_string_free(&name
);
2302 v9fs_string_free(&extension
);
2303 v9fs_path_free(&path
);
2306 static void coroutine_fn
v9fs_symlink(void *opaque
)
2308 V9fsPDU
*pdu
= opaque
;
2311 V9fsFidState
*dfidp
;
2319 v9fs_string_init(&name
);
2320 v9fs_string_init(&symname
);
2321 err
= pdu_unmarshal(pdu
, offset
, "dssd", &dfid
, &name
, &symname
, &gid
);
2325 trace_v9fs_symlink(pdu
->tag
, pdu
->id
, dfid
, name
.data
, symname
.data
, gid
);
2327 if (name_is_illegal(name
.data
)) {
2332 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2337 dfidp
= get_fid(pdu
, dfid
);
2338 if (dfidp
== NULL
) {
2342 err
= v9fs_co_symlink(pdu
, dfidp
, &name
, symname
.data
, gid
, &stbuf
);
2346 stat_to_qid(&stbuf
, &qid
);
2347 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
2352 trace_v9fs_symlink_return(pdu
->tag
, pdu
->id
,
2353 qid
.type
, qid
.version
, qid
.path
);
2355 put_fid(pdu
, dfidp
);
2357 pdu_complete(pdu
, err
);
2358 v9fs_string_free(&name
);
2359 v9fs_string_free(&symname
);
2362 static void coroutine_fn
v9fs_flush(void *opaque
)
2367 V9fsPDU
*cancel_pdu
= NULL
;
2368 V9fsPDU
*pdu
= opaque
;
2369 V9fsState
*s
= pdu
->s
;
2371 err
= pdu_unmarshal(pdu
, offset
, "w", &tag
);
2373 pdu_complete(pdu
, err
);
2376 trace_v9fs_flush(pdu
->tag
, pdu
->id
, tag
);
2378 if (pdu
->tag
== tag
) {
2379 error_report("Warning: the guest sent a self-referencing 9P flush request");
2381 QLIST_FOREACH(cancel_pdu
, &s
->active_list
, next
) {
2382 if (cancel_pdu
->tag
== tag
) {
2388 cancel_pdu
->cancelled
= 1;
2390 * Wait for pdu to complete.
2392 qemu_co_queue_wait(&cancel_pdu
->complete
, NULL
);
2393 if (!qemu_co_queue_next(&cancel_pdu
->complete
)) {
2394 cancel_pdu
->cancelled
= 0;
2395 pdu_free(cancel_pdu
);
2398 pdu_complete(pdu
, 7);
2401 static void coroutine_fn
v9fs_link(void *opaque
)
2403 V9fsPDU
*pdu
= opaque
;
2404 int32_t dfid
, oldfid
;
2405 V9fsFidState
*dfidp
, *oldfidp
;
2410 v9fs_string_init(&name
);
2411 err
= pdu_unmarshal(pdu
, offset
, "dds", &dfid
, &oldfid
, &name
);
2415 trace_v9fs_link(pdu
->tag
, pdu
->id
, dfid
, oldfid
, name
.data
);
2417 if (name_is_illegal(name
.data
)) {
2422 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2427 dfidp
= get_fid(pdu
, dfid
);
2428 if (dfidp
== NULL
) {
2433 oldfidp
= get_fid(pdu
, oldfid
);
2434 if (oldfidp
== NULL
) {
2438 err
= v9fs_co_link(pdu
, oldfidp
, dfidp
, &name
);
2442 put_fid(pdu
, oldfidp
);
2444 put_fid(pdu
, dfidp
);
2446 v9fs_string_free(&name
);
2447 pdu_complete(pdu
, err
);
2450 /* Only works with path name based fid */
2451 static void coroutine_fn
v9fs_remove(void *opaque
)
2457 V9fsPDU
*pdu
= opaque
;
2459 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
2463 trace_v9fs_remove(pdu
->tag
, pdu
->id
, fid
);
2465 fidp
= get_fid(pdu
, fid
);
2470 /* if fs driver is not path based, return EOPNOTSUPP */
2471 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2476 * IF the file is unlinked, we cannot reopen
2477 * the file later. So don't reclaim fd
2479 err
= v9fs_mark_fids_unreclaim(pdu
, &fidp
->path
);
2483 err
= v9fs_co_remove(pdu
, &fidp
->path
);
2488 /* For TREMOVE we need to clunk the fid even on failed remove */
2489 clunk_fid(pdu
->s
, fidp
->fid
);
2492 pdu_complete(pdu
, err
);
2495 static void coroutine_fn
v9fs_unlinkat(void *opaque
)
2499 int32_t dfid
, flags
;
2502 V9fsFidState
*dfidp
;
2503 V9fsPDU
*pdu
= opaque
;
2505 v9fs_string_init(&name
);
2506 err
= pdu_unmarshal(pdu
, offset
, "dsd", &dfid
, &name
, &flags
);
2511 if (name_is_illegal(name
.data
)) {
2516 if (!strcmp(".", name
.data
)) {
2521 if (!strcmp("..", name
.data
)) {
2526 dfidp
= get_fid(pdu
, dfid
);
2527 if (dfidp
== NULL
) {
2532 * IF the file is unlinked, we cannot reopen
2533 * the file later. So don't reclaim fd
2535 v9fs_path_init(&path
);
2536 err
= v9fs_co_name_to_path(pdu
, &dfidp
->path
, name
.data
, &path
);
2540 err
= v9fs_mark_fids_unreclaim(pdu
, &path
);
2544 err
= v9fs_co_unlinkat(pdu
, &dfidp
->path
, &name
, flags
);
2549 put_fid(pdu
, dfidp
);
2550 v9fs_path_free(&path
);
2552 pdu_complete(pdu
, err
);
2553 v9fs_string_free(&name
);
2557 /* Only works with path name based fid */
2558 static int coroutine_fn
v9fs_complete_rename(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2565 V9fsFidState
*tfidp
;
2566 V9fsState
*s
= pdu
->s
;
2567 V9fsFidState
*dirfidp
= NULL
;
2568 char *old_name
, *new_name
;
2570 v9fs_path_init(&new_path
);
2571 if (newdirfid
!= -1) {
2572 dirfidp
= get_fid(pdu
, newdirfid
);
2573 if (dirfidp
== NULL
) {
2577 if (fidp
->fid_type
!= P9_FID_NONE
) {
2581 err
= v9fs_co_name_to_path(pdu
, &dirfidp
->path
, name
->data
, &new_path
);
2586 old_name
= fidp
->path
.data
;
2587 end
= strrchr(old_name
, '/');
2593 new_name
= g_malloc0(end
- old_name
+ name
->size
+ 1);
2594 strncat(new_name
, old_name
, end
- old_name
);
2595 strncat(new_name
+ (end
- old_name
), name
->data
, name
->size
);
2596 err
= v9fs_co_name_to_path(pdu
, NULL
, new_name
, &new_path
);
2602 err
= v9fs_co_rename(pdu
, &fidp
->path
, &new_path
);
2607 * Fixup fid's pointing to the old name to
2608 * start pointing to the new name
2610 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2611 if (v9fs_path_is_ancestor(&fidp
->path
, &tfidp
->path
)) {
2612 /* replace the name */
2613 v9fs_fix_path(&tfidp
->path
, &new_path
, strlen(fidp
->path
.data
));
2618 put_fid(pdu
, dirfidp
);
2620 v9fs_path_free(&new_path
);
2625 /* Only works with path name based fid */
2626 static void coroutine_fn
v9fs_rename(void *opaque
)
2634 V9fsPDU
*pdu
= opaque
;
2635 V9fsState
*s
= pdu
->s
;
2637 v9fs_string_init(&name
);
2638 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newdirfid
, &name
);
2643 if (name_is_illegal(name
.data
)) {
2648 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2653 fidp
= get_fid(pdu
, fid
);
2658 if (fidp
->fid_type
!= P9_FID_NONE
) {
2662 /* if fs driver is not path based, return EOPNOTSUPP */
2663 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2667 v9fs_path_write_lock(s
);
2668 err
= v9fs_complete_rename(pdu
, fidp
, newdirfid
, &name
);
2669 v9fs_path_unlock(s
);
2676 pdu_complete(pdu
, err
);
2677 v9fs_string_free(&name
);
2680 static int coroutine_fn
v9fs_fix_fid_paths(V9fsPDU
*pdu
, V9fsPath
*olddir
,
2681 V9fsString
*old_name
,
2683 V9fsString
*new_name
)
2685 V9fsFidState
*tfidp
;
2686 V9fsPath oldpath
, newpath
;
2687 V9fsState
*s
= pdu
->s
;
2690 v9fs_path_init(&oldpath
);
2691 v9fs_path_init(&newpath
);
2692 err
= v9fs_co_name_to_path(pdu
, olddir
, old_name
->data
, &oldpath
);
2696 err
= v9fs_co_name_to_path(pdu
, newdir
, new_name
->data
, &newpath
);
2702 * Fixup fid's pointing to the old name to
2703 * start pointing to the new name
2705 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2706 if (v9fs_path_is_ancestor(&oldpath
, &tfidp
->path
)) {
2707 /* replace the name */
2708 v9fs_fix_path(&tfidp
->path
, &newpath
, strlen(oldpath
.data
));
2712 v9fs_path_free(&oldpath
);
2713 v9fs_path_free(&newpath
);
2717 static int coroutine_fn
v9fs_complete_renameat(V9fsPDU
*pdu
, int32_t olddirfid
,
2718 V9fsString
*old_name
,
2720 V9fsString
*new_name
)
2723 V9fsState
*s
= pdu
->s
;
2724 V9fsFidState
*newdirfidp
= NULL
, *olddirfidp
= NULL
;
2726 olddirfidp
= get_fid(pdu
, olddirfid
);
2727 if (olddirfidp
== NULL
) {
2731 if (newdirfid
!= -1) {
2732 newdirfidp
= get_fid(pdu
, newdirfid
);
2733 if (newdirfidp
== NULL
) {
2738 newdirfidp
= get_fid(pdu
, olddirfid
);
2741 err
= v9fs_co_renameat(pdu
, &olddirfidp
->path
, old_name
,
2742 &newdirfidp
->path
, new_name
);
2746 if (s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
) {
2747 /* Only for path based fid we need to do the below fixup */
2748 err
= v9fs_fix_fid_paths(pdu
, &olddirfidp
->path
, old_name
,
2749 &newdirfidp
->path
, new_name
);
2753 put_fid(pdu
, olddirfidp
);
2756 put_fid(pdu
, newdirfidp
);
2761 static void coroutine_fn
v9fs_renameat(void *opaque
)
2765 V9fsPDU
*pdu
= opaque
;
2766 V9fsState
*s
= pdu
->s
;
2767 int32_t olddirfid
, newdirfid
;
2768 V9fsString old_name
, new_name
;
2770 v9fs_string_init(&old_name
);
2771 v9fs_string_init(&new_name
);
2772 err
= pdu_unmarshal(pdu
, offset
, "dsds", &olddirfid
,
2773 &old_name
, &newdirfid
, &new_name
);
2778 if (name_is_illegal(old_name
.data
) || name_is_illegal(new_name
.data
)) {
2783 if (!strcmp(".", old_name
.data
) || !strcmp("..", old_name
.data
) ||
2784 !strcmp(".", new_name
.data
) || !strcmp("..", new_name
.data
)) {
2789 v9fs_path_write_lock(s
);
2790 err
= v9fs_complete_renameat(pdu
, olddirfid
,
2791 &old_name
, newdirfid
, &new_name
);
2792 v9fs_path_unlock(s
);
2798 pdu_complete(pdu
, err
);
2799 v9fs_string_free(&old_name
);
2800 v9fs_string_free(&new_name
);
2803 static void coroutine_fn
v9fs_wstat(void *opaque
)
2812 V9fsPDU
*pdu
= opaque
;
2814 v9fs_stat_init(&v9stat
);
2815 err
= pdu_unmarshal(pdu
, offset
, "dwS", &fid
, &unused
, &v9stat
);
2819 trace_v9fs_wstat(pdu
->tag
, pdu
->id
, fid
,
2820 v9stat
.mode
, v9stat
.atime
, v9stat
.mtime
);
2822 fidp
= get_fid(pdu
, fid
);
2827 /* do we need to sync the file? */
2828 if (donttouch_stat(&v9stat
)) {
2829 err
= v9fs_co_fsync(pdu
, fidp
, 0);
2832 if (v9stat
.mode
!= -1) {
2834 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2838 v9_mode
= stat_to_v9mode(&stbuf
);
2839 if ((v9stat
.mode
& P9_STAT_MODE_TYPE_BITS
) !=
2840 (v9_mode
& P9_STAT_MODE_TYPE_BITS
)) {
2841 /* Attempting to change the type */
2845 err
= v9fs_co_chmod(pdu
, &fidp
->path
,
2846 v9mode_to_mode(v9stat
.mode
,
2847 &v9stat
.extension
));
2852 if (v9stat
.mtime
!= -1 || v9stat
.atime
!= -1) {
2853 struct timespec times
[2];
2854 if (v9stat
.atime
!= -1) {
2855 times
[0].tv_sec
= v9stat
.atime
;
2856 times
[0].tv_nsec
= 0;
2858 times
[0].tv_nsec
= UTIME_OMIT
;
2860 if (v9stat
.mtime
!= -1) {
2861 times
[1].tv_sec
= v9stat
.mtime
;
2862 times
[1].tv_nsec
= 0;
2864 times
[1].tv_nsec
= UTIME_OMIT
;
2866 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
2871 if (v9stat
.n_gid
!= -1 || v9stat
.n_uid
!= -1) {
2872 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9stat
.n_uid
, v9stat
.n_gid
);
2877 if (v9stat
.name
.size
!= 0) {
2878 err
= v9fs_complete_rename(pdu
, fidp
, -1, &v9stat
.name
);
2883 if (v9stat
.length
!= -1) {
2884 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9stat
.length
);
2893 v9fs_stat_free(&v9stat
);
2894 pdu_complete(pdu
, err
);
2897 static int v9fs_fill_statfs(V9fsState
*s
, V9fsPDU
*pdu
, struct statfs
*stbuf
)
2909 int32_t bsize_factor
;
2912 * compute bsize factor based on host file system block size
2915 bsize_factor
= (s
->msize
- P9_IOHDRSZ
)/stbuf
->f_bsize
;
2916 if (!bsize_factor
) {
2919 f_type
= stbuf
->f_type
;
2920 f_bsize
= stbuf
->f_bsize
;
2921 f_bsize
*= bsize_factor
;
2923 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2924 * adjust(divide) the number of blocks, free blocks and available
2925 * blocks by bsize factor
2927 f_blocks
= stbuf
->f_blocks
/bsize_factor
;
2928 f_bfree
= stbuf
->f_bfree
/bsize_factor
;
2929 f_bavail
= stbuf
->f_bavail
/bsize_factor
;
2930 f_files
= stbuf
->f_files
;
2931 f_ffree
= stbuf
->f_ffree
;
2932 fsid_val
= (unsigned int) stbuf
->f_fsid
.__val
[0] |
2933 (unsigned long long)stbuf
->f_fsid
.__val
[1] << 32;
2934 f_namelen
= stbuf
->f_namelen
;
2936 return pdu_marshal(pdu
, offset
, "ddqqqqqqd",
2937 f_type
, f_bsize
, f_blocks
, f_bfree
,
2938 f_bavail
, f_files
, f_ffree
,
2939 fsid_val
, f_namelen
);
2942 static void coroutine_fn
v9fs_statfs(void *opaque
)
2948 struct statfs stbuf
;
2949 V9fsPDU
*pdu
= opaque
;
2950 V9fsState
*s
= pdu
->s
;
2952 retval
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
2956 fidp
= get_fid(pdu
, fid
);
2961 retval
= v9fs_co_statfs(pdu
, &fidp
->path
, &stbuf
);
2965 retval
= v9fs_fill_statfs(s
, pdu
, &stbuf
);
2973 pdu_complete(pdu
, retval
);
2976 static void coroutine_fn
v9fs_mknod(void *opaque
)
2989 V9fsPDU
*pdu
= opaque
;
2991 v9fs_string_init(&name
);
2992 err
= pdu_unmarshal(pdu
, offset
, "dsdddd", &fid
, &name
, &mode
,
2993 &major
, &minor
, &gid
);
2997 trace_v9fs_mknod(pdu
->tag
, pdu
->id
, fid
, mode
, major
, minor
);
2999 if (name_is_illegal(name
.data
)) {
3004 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3009 fidp
= get_fid(pdu
, fid
);
3014 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, gid
,
3015 makedev(major
, minor
), mode
, &stbuf
);
3019 stat_to_qid(&stbuf
, &qid
);
3020 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3025 trace_v9fs_mknod_return(pdu
->tag
, pdu
->id
,
3026 qid
.type
, qid
.version
, qid
.path
);
3030 pdu_complete(pdu
, err
);
3031 v9fs_string_free(&name
);
3035 * Implement posix byte range locking code
3036 * Server side handling of locking code is very simple, because 9p server in
3037 * QEMU can handle only one client. And most of the lock handling
3038 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3039 * do any thing in * qemu 9p server side lock code path.
3040 * So when a TLOCK request comes, always return success
3042 static void coroutine_fn
v9fs_lock(void *opaque
)
3048 int32_t fid
, err
= 0;
3049 V9fsPDU
*pdu
= opaque
;
3051 v9fs_string_init(&flock
.client_id
);
3052 err
= pdu_unmarshal(pdu
, offset
, "dbdqqds", &fid
, &flock
.type
,
3053 &flock
.flags
, &flock
.start
, &flock
.length
,
3054 &flock
.proc_id
, &flock
.client_id
);
3058 trace_v9fs_lock(pdu
->tag
, pdu
->id
, fid
,
3059 flock
.type
, flock
.start
, flock
.length
);
3062 /* We support only block flag now (that too ignored currently) */
3063 if (flock
.flags
& ~P9_LOCK_FLAGS_BLOCK
) {
3067 fidp
= get_fid(pdu
, fid
);
3072 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3076 err
= pdu_marshal(pdu
, offset
, "b", P9_LOCK_SUCCESS
);
3081 trace_v9fs_lock_return(pdu
->tag
, pdu
->id
, P9_LOCK_SUCCESS
);
3085 pdu_complete(pdu
, err
);
3086 v9fs_string_free(&flock
.client_id
);
3090 * When a TGETLOCK request comes, always return success because all lock
3091 * handling is done by client's VFS layer.
3093 static void coroutine_fn
v9fs_getlock(void *opaque
)
3099 int32_t fid
, err
= 0;
3100 V9fsPDU
*pdu
= opaque
;
3102 v9fs_string_init(&glock
.client_id
);
3103 err
= pdu_unmarshal(pdu
, offset
, "dbqqds", &fid
, &glock
.type
,
3104 &glock
.start
, &glock
.length
, &glock
.proc_id
,
3109 trace_v9fs_getlock(pdu
->tag
, pdu
->id
, fid
,
3110 glock
.type
, glock
.start
, glock
.length
);
3112 fidp
= get_fid(pdu
, fid
);
3117 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3121 glock
.type
= P9_LOCK_TYPE_UNLCK
;
3122 err
= pdu_marshal(pdu
, offset
, "bqqds", glock
.type
,
3123 glock
.start
, glock
.length
, glock
.proc_id
,
3129 trace_v9fs_getlock_return(pdu
->tag
, pdu
->id
, glock
.type
, glock
.start
,
3130 glock
.length
, glock
.proc_id
);
3134 pdu_complete(pdu
, err
);
3135 v9fs_string_free(&glock
.client_id
);
3138 static void coroutine_fn
v9fs_mkdir(void *opaque
)
3140 V9fsPDU
*pdu
= opaque
;
3151 v9fs_string_init(&name
);
3152 err
= pdu_unmarshal(pdu
, offset
, "dsdd", &fid
, &name
, &mode
, &gid
);
3156 trace_v9fs_mkdir(pdu
->tag
, pdu
->id
, fid
, name
.data
, mode
, gid
);
3158 if (name_is_illegal(name
.data
)) {
3163 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3168 fidp
= get_fid(pdu
, fid
);
3173 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, mode
, fidp
->uid
, gid
, &stbuf
);
3177 stat_to_qid(&stbuf
, &qid
);
3178 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3183 trace_v9fs_mkdir_return(pdu
->tag
, pdu
->id
,
3184 qid
.type
, qid
.version
, qid
.path
, err
);
3188 pdu_complete(pdu
, err
);
3189 v9fs_string_free(&name
);
3192 static void coroutine_fn
v9fs_xattrwalk(void *opaque
)
3198 int32_t fid
, newfid
;
3199 V9fsFidState
*file_fidp
;
3200 V9fsFidState
*xattr_fidp
= NULL
;
3201 V9fsPDU
*pdu
= opaque
;
3202 V9fsState
*s
= pdu
->s
;
3204 v9fs_string_init(&name
);
3205 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newfid
, &name
);
3209 trace_v9fs_xattrwalk(pdu
->tag
, pdu
->id
, fid
, newfid
, name
.data
);
3211 file_fidp
= get_fid(pdu
, fid
);
3212 if (file_fidp
== NULL
) {
3216 xattr_fidp
= alloc_fid(s
, newfid
);
3217 if (xattr_fidp
== NULL
) {
3221 v9fs_path_copy(&xattr_fidp
->path
, &file_fidp
->path
);
3222 if (!v9fs_string_size(&name
)) {
3224 * listxattr request. Get the size first
3226 size
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
, NULL
, 0);
3229 clunk_fid(s
, xattr_fidp
->fid
);
3233 * Read the xattr value
3235 xattr_fidp
->fs
.xattr
.len
= size
;
3236 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3237 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3239 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3240 err
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
,
3241 xattr_fidp
->fs
.xattr
.value
,
3242 xattr_fidp
->fs
.xattr
.len
);
3244 clunk_fid(s
, xattr_fidp
->fid
);
3248 err
= pdu_marshal(pdu
, offset
, "q", size
);
3255 * specific xattr fid. We check for xattr
3256 * presence also collect the xattr size
3258 size
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3262 clunk_fid(s
, xattr_fidp
->fid
);
3266 * Read the xattr value
3268 xattr_fidp
->fs
.xattr
.len
= size
;
3269 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3270 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3272 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3273 err
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3274 &name
, xattr_fidp
->fs
.xattr
.value
,
3275 xattr_fidp
->fs
.xattr
.len
);
3277 clunk_fid(s
, xattr_fidp
->fid
);
3281 err
= pdu_marshal(pdu
, offset
, "q", size
);
3287 trace_v9fs_xattrwalk_return(pdu
->tag
, pdu
->id
, size
);
3289 put_fid(pdu
, file_fidp
);
3291 put_fid(pdu
, xattr_fidp
);
3294 pdu_complete(pdu
, err
);
3295 v9fs_string_free(&name
);
3298 static void coroutine_fn
v9fs_xattrcreate(void *opaque
)
3306 V9fsFidState
*file_fidp
;
3307 V9fsFidState
*xattr_fidp
;
3308 V9fsPDU
*pdu
= opaque
;
3310 v9fs_string_init(&name
);
3311 err
= pdu_unmarshal(pdu
, offset
, "dsqd", &fid
, &name
, &size
, &flags
);
3315 trace_v9fs_xattrcreate(pdu
->tag
, pdu
->id
, fid
, name
.data
, size
, flags
);
3317 if (size
> XATTR_SIZE_MAX
) {
3322 file_fidp
= get_fid(pdu
, fid
);
3323 if (file_fidp
== NULL
) {
3327 if (file_fidp
->fid_type
!= P9_FID_NONE
) {
3332 /* Make the file fid point to xattr */
3333 xattr_fidp
= file_fidp
;
3334 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3335 xattr_fidp
->fs
.xattr
.copied_len
= 0;
3336 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= false;
3337 xattr_fidp
->fs
.xattr
.len
= size
;
3338 xattr_fidp
->fs
.xattr
.flags
= flags
;
3339 v9fs_string_init(&xattr_fidp
->fs
.xattr
.name
);
3340 v9fs_string_copy(&xattr_fidp
->fs
.xattr
.name
, &name
);
3341 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3344 put_fid(pdu
, file_fidp
);
3346 pdu_complete(pdu
, err
);
3347 v9fs_string_free(&name
);
3350 static void coroutine_fn
v9fs_readlink(void *opaque
)
3352 V9fsPDU
*pdu
= opaque
;
3359 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
3363 trace_v9fs_readlink(pdu
->tag
, pdu
->id
, fid
);
3364 fidp
= get_fid(pdu
, fid
);
3370 v9fs_string_init(&target
);
3371 err
= v9fs_co_readlink(pdu
, &fidp
->path
, &target
);
3375 err
= pdu_marshal(pdu
, offset
, "s", &target
);
3377 v9fs_string_free(&target
);
3381 trace_v9fs_readlink_return(pdu
->tag
, pdu
->id
, target
.data
);
3382 v9fs_string_free(&target
);
3386 pdu_complete(pdu
, err
);
3389 static CoroutineEntry
*pdu_co_handlers
[] = {
3390 [P9_TREADDIR
] = v9fs_readdir
,
3391 [P9_TSTATFS
] = v9fs_statfs
,
3392 [P9_TGETATTR
] = v9fs_getattr
,
3393 [P9_TSETATTR
] = v9fs_setattr
,
3394 [P9_TXATTRWALK
] = v9fs_xattrwalk
,
3395 [P9_TXATTRCREATE
] = v9fs_xattrcreate
,
3396 [P9_TMKNOD
] = v9fs_mknod
,
3397 [P9_TRENAME
] = v9fs_rename
,
3398 [P9_TLOCK
] = v9fs_lock
,
3399 [P9_TGETLOCK
] = v9fs_getlock
,
3400 [P9_TRENAMEAT
] = v9fs_renameat
,
3401 [P9_TREADLINK
] = v9fs_readlink
,
3402 [P9_TUNLINKAT
] = v9fs_unlinkat
,
3403 [P9_TMKDIR
] = v9fs_mkdir
,
3404 [P9_TVERSION
] = v9fs_version
,
3405 [P9_TLOPEN
] = v9fs_open
,
3406 [P9_TATTACH
] = v9fs_attach
,
3407 [P9_TSTAT
] = v9fs_stat
,
3408 [P9_TWALK
] = v9fs_walk
,
3409 [P9_TCLUNK
] = v9fs_clunk
,
3410 [P9_TFSYNC
] = v9fs_fsync
,
3411 [P9_TOPEN
] = v9fs_open
,
3412 [P9_TREAD
] = v9fs_read
,
3414 [P9_TAUTH
] = v9fs_auth
,
3416 [P9_TFLUSH
] = v9fs_flush
,
3417 [P9_TLINK
] = v9fs_link
,
3418 [P9_TSYMLINK
] = v9fs_symlink
,
3419 [P9_TCREATE
] = v9fs_create
,
3420 [P9_TLCREATE
] = v9fs_lcreate
,
3421 [P9_TWRITE
] = v9fs_write
,
3422 [P9_TWSTAT
] = v9fs_wstat
,
3423 [P9_TREMOVE
] = v9fs_remove
,
3426 static void coroutine_fn
v9fs_op_not_supp(void *opaque
)
3428 V9fsPDU
*pdu
= opaque
;
3429 pdu_complete(pdu
, -EOPNOTSUPP
);
3432 static void coroutine_fn
v9fs_fs_ro(void *opaque
)
3434 V9fsPDU
*pdu
= opaque
;
3435 pdu_complete(pdu
, -EROFS
);
3438 static inline bool is_read_only_op(V9fsPDU
*pdu
)
3465 void pdu_submit(V9fsPDU
*pdu
, P9MsgHeader
*hdr
)
3468 CoroutineEntry
*handler
;
3469 V9fsState
*s
= pdu
->s
;
3471 pdu
->size
= le32_to_cpu(hdr
->size_le
);
3473 pdu
->tag
= le16_to_cpu(hdr
->tag_le
);
3475 if (pdu
->id
>= ARRAY_SIZE(pdu_co_handlers
) ||
3476 (pdu_co_handlers
[pdu
->id
] == NULL
)) {
3477 handler
= v9fs_op_not_supp
;
3479 handler
= pdu_co_handlers
[pdu
->id
];
3482 if (is_ro_export(&s
->ctx
) && !is_read_only_op(pdu
)) {
3483 handler
= v9fs_fs_ro
;
3486 qemu_co_queue_init(&pdu
->complete
);
3487 co
= qemu_coroutine_create(handler
, pdu
);
3488 qemu_coroutine_enter(co
);
3491 /* Returns 0 on success, 1 on failure. */
3492 int v9fs_device_realize_common(V9fsState
*s
, Error
**errp
)
3500 /* initialize pdu allocator */
3501 QLIST_INIT(&s
->free_list
);
3502 QLIST_INIT(&s
->active_list
);
3503 for (i
= 0; i
< MAX_REQ
; i
++) {
3504 QLIST_INSERT_HEAD(&s
->free_list
, &s
->pdus
[i
], next
);
3509 v9fs_path_init(&path
);
3511 fse
= get_fsdev_fsentry(s
->fsconf
.fsdev_id
);
3514 /* We don't have a fsdev identified by fsdev_id */
3515 error_setg(errp
, "9pfs device couldn't find fsdev with the "
3517 s
->fsconf
.fsdev_id
? s
->fsconf
.fsdev_id
: "NULL");
3521 if (!s
->fsconf
.tag
) {
3522 /* we haven't specified a mount_tag */
3523 error_setg(errp
, "fsdev with id %s needs mount_tag arguments",
3524 s
->fsconf
.fsdev_id
);
3528 s
->ctx
.export_flags
= fse
->export_flags
;
3529 s
->ctx
.fs_root
= g_strdup(fse
->path
);
3530 s
->ctx
.exops
.get_st_gen
= NULL
;
3531 len
= strlen(s
->fsconf
.tag
);
3532 if (len
> MAX_TAG_LEN
- 1) {
3533 error_setg(errp
, "mount tag '%s' (%d bytes) is longer than "
3534 "maximum (%d bytes)", s
->fsconf
.tag
, len
, MAX_TAG_LEN
- 1);
3538 s
->tag
= g_strdup(s
->fsconf
.tag
);
3543 s
->ctx
.fmode
= fse
->fmode
;
3544 s
->ctx
.dmode
= fse
->dmode
;
3547 qemu_co_rwlock_init(&s
->rename_lock
);
3549 if (s
->ops
->init(&s
->ctx
) < 0) {
3550 error_setg(errp
, "9pfs Failed to initialize fs-driver with id:%s"
3551 " and export path:%s", s
->fsconf
.fsdev_id
, s
->ctx
.fs_root
);
3556 * Check details of export path, We need to use fs driver
3557 * call back to do that. Since we are in the init path, we don't
3558 * use co-routines here.
3560 if (s
->ops
->name_to_path(&s
->ctx
, NULL
, "/", &path
) < 0) {
3562 "error in converting name to path %s", strerror(errno
));
3565 if (s
->ops
->lstat(&s
->ctx
, &path
, &stat
)) {
3566 error_setg(errp
, "share path %s does not exist", fse
->path
);
3568 } else if (!S_ISDIR(stat
.st_mode
)) {
3569 error_setg(errp
, "share path %s is not a directory", fse
->path
);
3573 s
->ctx
.fst
= &fse
->fst
;
3574 fsdev_throttle_init(s
->ctx
.fst
);
3576 v9fs_path_free(&path
);
3581 if (s
->ops
&& s
->ops
->cleanup
&& s
->ctx
.private) {
3582 s
->ops
->cleanup(&s
->ctx
);
3585 g_free(s
->ctx
.fs_root
);
3586 v9fs_path_free(&path
);
3591 void v9fs_device_unrealize_common(V9fsState
*s
, Error
**errp
)
3593 if (s
->ops
->cleanup
) {
3594 s
->ops
->cleanup(&s
->ctx
);
3596 fsdev_throttle_cleanup(s
->ctx
.fst
);
3598 g_free(s
->ctx
.fs_root
);
3601 typedef struct VirtfsCoResetData
{
3604 } VirtfsCoResetData
;
3606 static void coroutine_fn
virtfs_co_reset(void *opaque
)
3608 VirtfsCoResetData
*data
= opaque
;
3610 virtfs_reset(&data
->pdu
);
3614 void v9fs_reset(V9fsState
*s
)
3616 VirtfsCoResetData data
= { .pdu
= { .s
= s
}, .done
= false };
3619 while (!QLIST_EMPTY(&s
->active_list
)) {
3620 aio_poll(qemu_get_aio_context(), true);
3623 co
= qemu_coroutine_create(virtfs_co_reset
, &data
);
3624 qemu_coroutine_enter(co
);
3626 while (!data
.done
) {
3627 aio_poll(qemu_get_aio_context(), true);
3631 static void __attribute__((__constructor__
)) v9fs_set_fd_limit(void)
3634 if (getrlimit(RLIMIT_NOFILE
, &rlim
) < 0) {
3635 error_report("Failed to get the resource limit");
3638 open_fd_hw
= rlim
.rlim_cur
- MIN(400, rlim
.rlim_cur
/3);
3639 open_fd_rc
= rlim
.rlim_cur
/2;