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/migration.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 void pdu_push_and_notify(V9fsPDU
*pdu
)
70 pdu
->s
->transport
->push_and_notify(pdu
);
73 static int omode_to_uflags(int8_t mode
)
107 struct dotl_openflag_map
{
112 static int dotl_to_open_flags(int flags
)
116 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
117 * and P9_DOTL_NOACCESS
119 int oflags
= flags
& O_ACCMODE
;
121 struct dotl_openflag_map dotl_oflag_map
[] = {
122 { P9_DOTL_CREATE
, O_CREAT
},
123 { P9_DOTL_EXCL
, O_EXCL
},
124 { P9_DOTL_NOCTTY
, O_NOCTTY
},
125 { P9_DOTL_TRUNC
, O_TRUNC
},
126 { P9_DOTL_APPEND
, O_APPEND
},
127 { P9_DOTL_NONBLOCK
, O_NONBLOCK
} ,
128 { P9_DOTL_DSYNC
, O_DSYNC
},
129 { P9_DOTL_FASYNC
, FASYNC
},
130 { P9_DOTL_DIRECT
, O_DIRECT
},
131 { P9_DOTL_LARGEFILE
, O_LARGEFILE
},
132 { P9_DOTL_DIRECTORY
, O_DIRECTORY
},
133 { P9_DOTL_NOFOLLOW
, O_NOFOLLOW
},
134 { P9_DOTL_NOATIME
, O_NOATIME
},
135 { P9_DOTL_SYNC
, O_SYNC
},
138 for (i
= 0; i
< ARRAY_SIZE(dotl_oflag_map
); i
++) {
139 if (flags
& dotl_oflag_map
[i
].dotl_flag
) {
140 oflags
|= dotl_oflag_map
[i
].open_flag
;
147 void cred_init(FsCred
*credp
)
155 static int get_dotl_openflags(V9fsState
*s
, int oflags
)
159 * Filter the client open flags
161 flags
= dotl_to_open_flags(oflags
);
162 flags
&= ~(O_NOCTTY
| O_ASYNC
| O_CREAT
);
164 * Ignore direct disk access hint until the server supports it.
170 void v9fs_path_init(V9fsPath
*path
)
176 void v9fs_path_free(V9fsPath
*path
)
184 void GCC_FMT_ATTR(2, 3)
185 v9fs_path_sprintf(V9fsPath
*path
, const char *fmt
, ...)
189 v9fs_path_free(path
);
192 /* Bump the size for including terminating NULL */
193 path
->size
= g_vasprintf(&path
->data
, fmt
, ap
) + 1;
197 void v9fs_path_copy(V9fsPath
*lhs
, V9fsPath
*rhs
)
200 lhs
->data
= g_malloc(rhs
->size
);
201 memcpy(lhs
->data
, rhs
->data
, rhs
->size
);
202 lhs
->size
= rhs
->size
;
205 int v9fs_name_to_path(V9fsState
*s
, V9fsPath
*dirpath
,
206 const char *name
, V9fsPath
*path
)
209 err
= s
->ops
->name_to_path(&s
->ctx
, dirpath
, name
, path
);
217 * Return TRUE if s1 is an ancestor of s2.
219 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
220 * As a special case, We treat s1 as ancestor of s2 if they are same!
222 static int v9fs_path_is_ancestor(V9fsPath
*s1
, V9fsPath
*s2
)
224 if (!strncmp(s1
->data
, s2
->data
, s1
->size
- 1)) {
225 if (s2
->data
[s1
->size
- 1] == '\0' || s2
->data
[s1
->size
- 1] == '/') {
232 static size_t v9fs_string_size(V9fsString
*str
)
238 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
239 static int coroutine_fn
v9fs_reopen_fid(V9fsPDU
*pdu
, V9fsFidState
*f
)
242 if (f
->fid_type
== P9_FID_FILE
) {
243 if (f
->fs
.fd
== -1) {
245 err
= v9fs_co_open(pdu
, f
, f
->open_flags
);
246 } while (err
== -EINTR
&& !pdu
->cancelled
);
248 } else if (f
->fid_type
== P9_FID_DIR
) {
249 if (f
->fs
.dir
.stream
== NULL
) {
251 err
= v9fs_co_opendir(pdu
, f
);
252 } while (err
== -EINTR
&& !pdu
->cancelled
);
258 static V9fsFidState
*coroutine_fn
get_fid(V9fsPDU
*pdu
, int32_t fid
)
262 V9fsState
*s
= pdu
->s
;
264 for (f
= s
->fid_list
; f
; f
= f
->next
) {
268 * Update the fid ref upfront so that
269 * we don't get reclaimed when we yield
274 * check whether we need to reopen the
275 * file. We might have closed the fd
276 * while trying to free up some file
279 err
= v9fs_reopen_fid(pdu
, f
);
285 * Mark the fid as referenced so that the LRU
286 * reclaim won't close the file descriptor
288 f
->flags
|= FID_REFERENCED
;
295 static V9fsFidState
*alloc_fid(V9fsState
*s
, int32_t fid
)
299 for (f
= s
->fid_list
; f
; f
= f
->next
) {
300 /* If fid is already there return NULL */
306 f
= g_malloc0(sizeof(V9fsFidState
));
308 f
->fid_type
= P9_FID_NONE
;
311 * Mark the fid as referenced so that the LRU
312 * reclaim won't close the file descriptor
314 f
->flags
|= FID_REFERENCED
;
315 f
->next
= s
->fid_list
;
318 v9fs_readdir_init(&f
->fs
.dir
);
319 v9fs_readdir_init(&f
->fs_reclaim
.dir
);
324 static int coroutine_fn
v9fs_xattr_fid_clunk(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
328 if (fidp
->fs
.xattr
.xattrwalk_fid
) {
329 /* getxattr/listxattr fid */
333 * if this is fid for setxattr. clunk should
334 * result in setxattr localcall
336 if (fidp
->fs
.xattr
.len
!= fidp
->fs
.xattr
.copied_len
) {
337 /* clunk after partial write */
341 if (fidp
->fs
.xattr
.len
) {
342 retval
= v9fs_co_lsetxattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
,
343 fidp
->fs
.xattr
.value
,
345 fidp
->fs
.xattr
.flags
);
347 retval
= v9fs_co_lremovexattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
);
350 v9fs_string_free(&fidp
->fs
.xattr
.name
);
352 g_free(fidp
->fs
.xattr
.value
);
356 static int coroutine_fn
free_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
360 if (fidp
->fid_type
== P9_FID_FILE
) {
361 /* If we reclaimed the fd no need to close */
362 if (fidp
->fs
.fd
!= -1) {
363 retval
= v9fs_co_close(pdu
, &fidp
->fs
);
365 } else if (fidp
->fid_type
== P9_FID_DIR
) {
366 if (fidp
->fs
.dir
.stream
!= NULL
) {
367 retval
= v9fs_co_closedir(pdu
, &fidp
->fs
);
369 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
370 retval
= v9fs_xattr_fid_clunk(pdu
, fidp
);
372 v9fs_path_free(&fidp
->path
);
377 static int coroutine_fn
put_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
382 * Don't free the fid if it is in reclaim list
384 if (!fidp
->ref
&& fidp
->clunked
) {
385 if (fidp
->fid
== pdu
->s
->root_fid
) {
387 * if the clunked fid is root fid then we
388 * have unmounted the fs on the client side.
389 * delete the migration blocker. Ideally, this
390 * should be hooked to transport close notification
392 if (pdu
->s
->migration_blocker
) {
393 migrate_del_blocker(pdu
->s
->migration_blocker
);
394 error_free(pdu
->s
->migration_blocker
);
395 pdu
->s
->migration_blocker
= NULL
;
398 return free_fid(pdu
, fidp
);
403 static V9fsFidState
*clunk_fid(V9fsState
*s
, int32_t fid
)
405 V9fsFidState
**fidpp
, *fidp
;
407 for (fidpp
= &s
->fid_list
; *fidpp
; fidpp
= &(*fidpp
)->next
) {
408 if ((*fidpp
)->fid
== fid
) {
412 if (*fidpp
== NULL
) {
421 void coroutine_fn
v9fs_reclaim_fd(V9fsPDU
*pdu
)
423 int reclaim_count
= 0;
424 V9fsState
*s
= pdu
->s
;
425 V9fsFidState
*f
, *reclaim_list
= NULL
;
427 for (f
= s
->fid_list
; f
; f
= f
->next
) {
429 * Unlink fids cannot be reclaimed. Check
430 * for them and skip them. Also skip fids
431 * currently being operated on.
433 if (f
->ref
|| f
->flags
& FID_NON_RECLAIMABLE
) {
437 * if it is a recently referenced fid
438 * we leave the fid untouched and clear the
439 * reference bit. We come back to it later
440 * in the next iteration. (a simple LRU without
441 * moving list elements around)
443 if (f
->flags
& FID_REFERENCED
) {
444 f
->flags
&= ~FID_REFERENCED
;
448 * Add fids to reclaim list.
450 if (f
->fid_type
== P9_FID_FILE
) {
451 if (f
->fs
.fd
!= -1) {
453 * Up the reference count so that
454 * a clunk request won't free this fid
457 f
->rclm_lst
= reclaim_list
;
459 f
->fs_reclaim
.fd
= f
->fs
.fd
;
463 } else if (f
->fid_type
== P9_FID_DIR
) {
464 if (f
->fs
.dir
.stream
!= NULL
) {
466 * Up the reference count so that
467 * a clunk request won't free this fid
470 f
->rclm_lst
= reclaim_list
;
472 f
->fs_reclaim
.dir
.stream
= f
->fs
.dir
.stream
;
473 f
->fs
.dir
.stream
= NULL
;
477 if (reclaim_count
>= open_fd_rc
) {
482 * Now close the fid in reclaim list. Free them if they
483 * are already clunked.
485 while (reclaim_list
) {
487 reclaim_list
= f
->rclm_lst
;
488 if (f
->fid_type
== P9_FID_FILE
) {
489 v9fs_co_close(pdu
, &f
->fs_reclaim
);
490 } else if (f
->fid_type
== P9_FID_DIR
) {
491 v9fs_co_closedir(pdu
, &f
->fs_reclaim
);
495 * Now drop the fid reference, free it
502 static int coroutine_fn
v9fs_mark_fids_unreclaim(V9fsPDU
*pdu
, V9fsPath
*path
)
505 V9fsState
*s
= pdu
->s
;
506 V9fsFidState
*fidp
, head_fid
;
508 head_fid
.next
= s
->fid_list
;
509 for (fidp
= s
->fid_list
; fidp
; fidp
= fidp
->next
) {
510 if (fidp
->path
.size
!= path
->size
) {
513 if (!memcmp(fidp
->path
.data
, path
->data
, path
->size
)) {
514 /* Mark the fid non reclaimable. */
515 fidp
->flags
|= FID_NON_RECLAIMABLE
;
517 /* reopen the file/dir if already closed */
518 err
= v9fs_reopen_fid(pdu
, fidp
);
523 * Go back to head of fid list because
524 * the list could have got updated when
525 * switched to the worker thread
535 static void coroutine_fn
virtfs_reset(V9fsPDU
*pdu
)
537 V9fsState
*s
= pdu
->s
;
541 while (s
->fid_list
) {
543 s
->fid_list
= fidp
->next
;
553 #define P9_QID_TYPE_DIR 0x80
554 #define P9_QID_TYPE_SYMLINK 0x02
556 #define P9_STAT_MODE_DIR 0x80000000
557 #define P9_STAT_MODE_APPEND 0x40000000
558 #define P9_STAT_MODE_EXCL 0x20000000
559 #define P9_STAT_MODE_MOUNT 0x10000000
560 #define P9_STAT_MODE_AUTH 0x08000000
561 #define P9_STAT_MODE_TMP 0x04000000
562 #define P9_STAT_MODE_SYMLINK 0x02000000
563 #define P9_STAT_MODE_LINK 0x01000000
564 #define P9_STAT_MODE_DEVICE 0x00800000
565 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
566 #define P9_STAT_MODE_SOCKET 0x00100000
567 #define P9_STAT_MODE_SETUID 0x00080000
568 #define P9_STAT_MODE_SETGID 0x00040000
569 #define P9_STAT_MODE_SETVTX 0x00010000
571 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
572 P9_STAT_MODE_SYMLINK | \
573 P9_STAT_MODE_LINK | \
574 P9_STAT_MODE_DEVICE | \
575 P9_STAT_MODE_NAMED_PIPE | \
578 /* This is the algorithm from ufs in spfs */
579 static void stat_to_qid(const struct stat
*stbuf
, V9fsQID
*qidp
)
583 memset(&qidp
->path
, 0, sizeof(qidp
->path
));
584 size
= MIN(sizeof(stbuf
->st_ino
), sizeof(qidp
->path
));
585 memcpy(&qidp
->path
, &stbuf
->st_ino
, size
);
586 qidp
->version
= stbuf
->st_mtime
^ (stbuf
->st_size
<< 8);
588 if (S_ISDIR(stbuf
->st_mode
)) {
589 qidp
->type
|= P9_QID_TYPE_DIR
;
591 if (S_ISLNK(stbuf
->st_mode
)) {
592 qidp
->type
|= P9_QID_TYPE_SYMLINK
;
596 static int coroutine_fn
fid_to_qid(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
602 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
606 stat_to_qid(&stbuf
, qidp
);
610 V9fsPDU
*pdu_alloc(V9fsState
*s
)
614 if (!QLIST_EMPTY(&s
->free_list
)) {
615 pdu
= QLIST_FIRST(&s
->free_list
);
616 QLIST_REMOVE(pdu
, next
);
617 QLIST_INSERT_HEAD(&s
->active_list
, pdu
, next
);
622 void pdu_free(V9fsPDU
*pdu
)
624 V9fsState
*s
= pdu
->s
;
626 g_assert(!pdu
->cancelled
);
627 QLIST_REMOVE(pdu
, next
);
628 QLIST_INSERT_HEAD(&s
->free_list
, pdu
, next
);
632 * We don't do error checking for pdu_marshal/unmarshal here
633 * because we always expect to have enough space to encode
636 static void coroutine_fn
pdu_complete(V9fsPDU
*pdu
, ssize_t len
)
638 int8_t id
= pdu
->id
+ 1; /* Response */
639 V9fsState
*s
= pdu
->s
;
645 if (s
->proto_version
!= V9FS_PROTO_2000L
) {
648 str
.data
= strerror(err
);
649 str
.size
= strlen(str
.data
);
651 len
+= pdu_marshal(pdu
, len
, "s", &str
);
655 len
+= 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 pdu_marshal(pdu
, 0, "dbw", (int32_t)len
, id
, pdu
->tag
);
666 /* keep these in sync */
670 pdu_push_and_notify(pdu
);
672 /* Now wakeup anybody waiting in flush for this request */
673 if (!qemu_co_queue_next(&pdu
->complete
)) {
678 static mode_t
v9mode_to_mode(uint32_t mode
, V9fsString
*extension
)
683 if (mode
& P9_STAT_MODE_DIR
) {
687 if (mode
& P9_STAT_MODE_SYMLINK
) {
690 if (mode
& P9_STAT_MODE_SOCKET
) {
693 if (mode
& P9_STAT_MODE_NAMED_PIPE
) {
696 if (mode
& P9_STAT_MODE_DEVICE
) {
697 if (extension
->size
&& extension
->data
[0] == 'c') {
708 if (mode
& P9_STAT_MODE_SETUID
) {
711 if (mode
& P9_STAT_MODE_SETGID
) {
714 if (mode
& P9_STAT_MODE_SETVTX
) {
721 static int donttouch_stat(V9fsStat
*stat
)
723 if (stat
->type
== -1 &&
725 stat
->qid
.type
== -1 &&
726 stat
->qid
.version
== -1 &&
727 stat
->qid
.path
== -1 &&
731 stat
->length
== -1 &&
738 stat
->n_muid
== -1) {
745 static void v9fs_stat_init(V9fsStat
*stat
)
747 v9fs_string_init(&stat
->name
);
748 v9fs_string_init(&stat
->uid
);
749 v9fs_string_init(&stat
->gid
);
750 v9fs_string_init(&stat
->muid
);
751 v9fs_string_init(&stat
->extension
);
754 static void v9fs_stat_free(V9fsStat
*stat
)
756 v9fs_string_free(&stat
->name
);
757 v9fs_string_free(&stat
->uid
);
758 v9fs_string_free(&stat
->gid
);
759 v9fs_string_free(&stat
->muid
);
760 v9fs_string_free(&stat
->extension
);
763 static uint32_t stat_to_v9mode(const struct stat
*stbuf
)
767 mode
= stbuf
->st_mode
& 0777;
768 if (S_ISDIR(stbuf
->st_mode
)) {
769 mode
|= P9_STAT_MODE_DIR
;
772 if (S_ISLNK(stbuf
->st_mode
)) {
773 mode
|= P9_STAT_MODE_SYMLINK
;
776 if (S_ISSOCK(stbuf
->st_mode
)) {
777 mode
|= P9_STAT_MODE_SOCKET
;
780 if (S_ISFIFO(stbuf
->st_mode
)) {
781 mode
|= P9_STAT_MODE_NAMED_PIPE
;
784 if (S_ISBLK(stbuf
->st_mode
) || S_ISCHR(stbuf
->st_mode
)) {
785 mode
|= P9_STAT_MODE_DEVICE
;
788 if (stbuf
->st_mode
& S_ISUID
) {
789 mode
|= P9_STAT_MODE_SETUID
;
792 if (stbuf
->st_mode
& S_ISGID
) {
793 mode
|= P9_STAT_MODE_SETGID
;
796 if (stbuf
->st_mode
& S_ISVTX
) {
797 mode
|= P9_STAT_MODE_SETVTX
;
803 static int coroutine_fn
stat_to_v9stat(V9fsPDU
*pdu
, V9fsPath
*name
,
804 const struct stat
*stbuf
,
810 memset(v9stat
, 0, sizeof(*v9stat
));
812 stat_to_qid(stbuf
, &v9stat
->qid
);
813 v9stat
->mode
= stat_to_v9mode(stbuf
);
814 v9stat
->atime
= stbuf
->st_atime
;
815 v9stat
->mtime
= stbuf
->st_mtime
;
816 v9stat
->length
= stbuf
->st_size
;
818 v9fs_string_free(&v9stat
->uid
);
819 v9fs_string_free(&v9stat
->gid
);
820 v9fs_string_free(&v9stat
->muid
);
822 v9stat
->n_uid
= stbuf
->st_uid
;
823 v9stat
->n_gid
= stbuf
->st_gid
;
826 v9fs_string_free(&v9stat
->extension
);
828 if (v9stat
->mode
& P9_STAT_MODE_SYMLINK
) {
829 err
= v9fs_co_readlink(pdu
, name
, &v9stat
->extension
);
833 } else if (v9stat
->mode
& P9_STAT_MODE_DEVICE
) {
834 v9fs_string_sprintf(&v9stat
->extension
, "%c %u %u",
835 S_ISCHR(stbuf
->st_mode
) ? 'c' : 'b',
836 major(stbuf
->st_rdev
), minor(stbuf
->st_rdev
));
837 } else if (S_ISDIR(stbuf
->st_mode
) || S_ISREG(stbuf
->st_mode
)) {
838 v9fs_string_sprintf(&v9stat
->extension
, "%s %lu",
839 "HARDLINKCOUNT", (unsigned long)stbuf
->st_nlink
);
842 str
= strrchr(name
->data
, '/');
849 v9fs_string_sprintf(&v9stat
->name
, "%s", str
);
852 v9fs_string_size(&v9stat
->name
) +
853 v9fs_string_size(&v9stat
->uid
) +
854 v9fs_string_size(&v9stat
->gid
) +
855 v9fs_string_size(&v9stat
->muid
) +
856 v9fs_string_size(&v9stat
->extension
);
860 #define P9_STATS_MODE 0x00000001ULL
861 #define P9_STATS_NLINK 0x00000002ULL
862 #define P9_STATS_UID 0x00000004ULL
863 #define P9_STATS_GID 0x00000008ULL
864 #define P9_STATS_RDEV 0x00000010ULL
865 #define P9_STATS_ATIME 0x00000020ULL
866 #define P9_STATS_MTIME 0x00000040ULL
867 #define P9_STATS_CTIME 0x00000080ULL
868 #define P9_STATS_INO 0x00000100ULL
869 #define P9_STATS_SIZE 0x00000200ULL
870 #define P9_STATS_BLOCKS 0x00000400ULL
872 #define P9_STATS_BTIME 0x00000800ULL
873 #define P9_STATS_GEN 0x00001000ULL
874 #define P9_STATS_DATA_VERSION 0x00002000ULL
876 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
877 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
880 static void stat_to_v9stat_dotl(V9fsState
*s
, const struct stat
*stbuf
,
881 V9fsStatDotl
*v9lstat
)
883 memset(v9lstat
, 0, sizeof(*v9lstat
));
885 v9lstat
->st_mode
= stbuf
->st_mode
;
886 v9lstat
->st_nlink
= stbuf
->st_nlink
;
887 v9lstat
->st_uid
= stbuf
->st_uid
;
888 v9lstat
->st_gid
= stbuf
->st_gid
;
889 v9lstat
->st_rdev
= stbuf
->st_rdev
;
890 v9lstat
->st_size
= stbuf
->st_size
;
891 v9lstat
->st_blksize
= stbuf
->st_blksize
;
892 v9lstat
->st_blocks
= stbuf
->st_blocks
;
893 v9lstat
->st_atime_sec
= stbuf
->st_atime
;
894 v9lstat
->st_atime_nsec
= stbuf
->st_atim
.tv_nsec
;
895 v9lstat
->st_mtime_sec
= stbuf
->st_mtime
;
896 v9lstat
->st_mtime_nsec
= stbuf
->st_mtim
.tv_nsec
;
897 v9lstat
->st_ctime_sec
= stbuf
->st_ctime
;
898 v9lstat
->st_ctime_nsec
= stbuf
->st_ctim
.tv_nsec
;
899 /* Currently we only support BASIC fields in stat */
900 v9lstat
->st_result_mask
= P9_STATS_BASIC
;
902 stat_to_qid(stbuf
, &v9lstat
->qid
);
905 static void print_sg(struct iovec
*sg
, int cnt
)
909 printf("sg[%d]: {", cnt
);
910 for (i
= 0; i
< cnt
; i
++) {
914 printf("(%p, %zd)", sg
[i
].iov_base
, sg
[i
].iov_len
);
919 /* Will call this only for path name based fid */
920 static void v9fs_fix_path(V9fsPath
*dst
, V9fsPath
*src
, int len
)
923 v9fs_path_init(&str
);
924 v9fs_path_copy(&str
, dst
);
925 v9fs_path_sprintf(dst
, "%s%s", src
->data
, str
.data
+ len
);
926 v9fs_path_free(&str
);
929 static inline bool is_ro_export(FsContext
*ctx
)
931 return ctx
->export_flags
& V9FS_RDONLY
;
934 static void coroutine_fn
v9fs_version(void *opaque
)
937 V9fsPDU
*pdu
= opaque
;
938 V9fsState
*s
= pdu
->s
;
942 v9fs_string_init(&version
);
943 err
= pdu_unmarshal(pdu
, offset
, "ds", &s
->msize
, &version
);
948 trace_v9fs_version(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
952 if (!strcmp(version
.data
, "9P2000.u")) {
953 s
->proto_version
= V9FS_PROTO_2000U
;
954 } else if (!strcmp(version
.data
, "9P2000.L")) {
955 s
->proto_version
= V9FS_PROTO_2000L
;
957 v9fs_string_sprintf(&version
, "unknown");
960 err
= pdu_marshal(pdu
, offset
, "ds", s
->msize
, &version
);
966 trace_v9fs_version_return(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
968 pdu_complete(pdu
, offset
);
969 v9fs_string_free(&version
);
972 static void coroutine_fn
v9fs_attach(void *opaque
)
974 V9fsPDU
*pdu
= opaque
;
975 V9fsState
*s
= pdu
->s
;
976 int32_t fid
, afid
, n_uname
;
977 V9fsString uname
, aname
;
982 Error
*local_err
= NULL
;
984 v9fs_string_init(&uname
);
985 v9fs_string_init(&aname
);
986 err
= pdu_unmarshal(pdu
, offset
, "ddssd", &fid
,
987 &afid
, &uname
, &aname
, &n_uname
);
991 trace_v9fs_attach(pdu
->tag
, pdu
->id
, fid
, afid
, uname
.data
, aname
.data
);
993 fidp
= alloc_fid(s
, fid
);
999 err
= v9fs_co_name_to_path(pdu
, NULL
, "/", &fidp
->path
);
1005 err
= fid_to_qid(pdu
, fidp
, &qid
);
1013 * disable migration if we haven't done already.
1014 * attach could get called multiple times for the same export.
1016 if (!s
->migration_blocker
) {
1017 error_setg(&s
->migration_blocker
,
1018 "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
1019 s
->ctx
.fs_root
? s
->ctx
.fs_root
: "NULL", s
->tag
);
1020 err
= migrate_add_blocker(s
->migration_blocker
, &local_err
);
1022 error_free(local_err
);
1023 error_free(s
->migration_blocker
);
1024 s
->migration_blocker
= NULL
;
1031 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
1038 memcpy(&s
->root_qid
, &qid
, sizeof(qid
));
1039 trace_v9fs_attach_return(pdu
->tag
, pdu
->id
,
1040 qid
.type
, qid
.version
, qid
.path
);
1044 pdu_complete(pdu
, err
);
1045 v9fs_string_free(&uname
);
1046 v9fs_string_free(&aname
);
1049 static void coroutine_fn
v9fs_stat(void *opaque
)
1057 V9fsPDU
*pdu
= opaque
;
1059 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
1063 trace_v9fs_stat(pdu
->tag
, pdu
->id
, fid
);
1065 fidp
= get_fid(pdu
, fid
);
1070 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1074 err
= stat_to_v9stat(pdu
, &fidp
->path
, &stbuf
, &v9stat
);
1078 err
= pdu_marshal(pdu
, offset
, "wS", 0, &v9stat
);
1080 v9fs_stat_free(&v9stat
);
1083 trace_v9fs_stat_return(pdu
->tag
, pdu
->id
, v9stat
.mode
,
1084 v9stat
.atime
, v9stat
.mtime
, v9stat
.length
);
1086 v9fs_stat_free(&v9stat
);
1090 pdu_complete(pdu
, err
);
1093 static void coroutine_fn
v9fs_getattr(void *opaque
)
1100 uint64_t request_mask
;
1101 V9fsStatDotl v9stat_dotl
;
1102 V9fsPDU
*pdu
= opaque
;
1103 V9fsState
*s
= pdu
->s
;
1105 retval
= pdu_unmarshal(pdu
, offset
, "dq", &fid
, &request_mask
);
1109 trace_v9fs_getattr(pdu
->tag
, pdu
->id
, fid
, request_mask
);
1111 fidp
= get_fid(pdu
, fid
);
1117 * Currently we only support BASIC fields in stat, so there is no
1118 * need to look at request_mask.
1120 retval
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1124 stat_to_v9stat_dotl(s
, &stbuf
, &v9stat_dotl
);
1126 /* fill st_gen if requested and supported by underlying fs */
1127 if (request_mask
& P9_STATS_GEN
) {
1128 retval
= v9fs_co_st_gen(pdu
, &fidp
->path
, stbuf
.st_mode
, &v9stat_dotl
);
1131 /* we have valid st_gen: update result mask */
1132 v9stat_dotl
.st_result_mask
|= P9_STATS_GEN
;
1135 /* request cancelled, e.g. by Tflush */
1138 /* failed to get st_gen: not fatal, ignore */
1142 retval
= pdu_marshal(pdu
, offset
, "A", &v9stat_dotl
);
1147 trace_v9fs_getattr_return(pdu
->tag
, pdu
->id
, v9stat_dotl
.st_result_mask
,
1148 v9stat_dotl
.st_mode
, v9stat_dotl
.st_uid
,
1149 v9stat_dotl
.st_gid
);
1153 pdu_complete(pdu
, retval
);
1156 /* Attribute flags */
1157 #define P9_ATTR_MODE (1 << 0)
1158 #define P9_ATTR_UID (1 << 1)
1159 #define P9_ATTR_GID (1 << 2)
1160 #define P9_ATTR_SIZE (1 << 3)
1161 #define P9_ATTR_ATIME (1 << 4)
1162 #define P9_ATTR_MTIME (1 << 5)
1163 #define P9_ATTR_CTIME (1 << 6)
1164 #define P9_ATTR_ATIME_SET (1 << 7)
1165 #define P9_ATTR_MTIME_SET (1 << 8)
1167 #define P9_ATTR_MASK 127
1169 static void coroutine_fn
v9fs_setattr(void *opaque
)
1176 V9fsPDU
*pdu
= opaque
;
1178 err
= pdu_unmarshal(pdu
, offset
, "dI", &fid
, &v9iattr
);
1183 fidp
= get_fid(pdu
, fid
);
1188 if (v9iattr
.valid
& P9_ATTR_MODE
) {
1189 err
= v9fs_co_chmod(pdu
, &fidp
->path
, v9iattr
.mode
);
1194 if (v9iattr
.valid
& (P9_ATTR_ATIME
| P9_ATTR_MTIME
)) {
1195 struct timespec times
[2];
1196 if (v9iattr
.valid
& P9_ATTR_ATIME
) {
1197 if (v9iattr
.valid
& P9_ATTR_ATIME_SET
) {
1198 times
[0].tv_sec
= v9iattr
.atime_sec
;
1199 times
[0].tv_nsec
= v9iattr
.atime_nsec
;
1201 times
[0].tv_nsec
= UTIME_NOW
;
1204 times
[0].tv_nsec
= UTIME_OMIT
;
1206 if (v9iattr
.valid
& P9_ATTR_MTIME
) {
1207 if (v9iattr
.valid
& P9_ATTR_MTIME_SET
) {
1208 times
[1].tv_sec
= v9iattr
.mtime_sec
;
1209 times
[1].tv_nsec
= v9iattr
.mtime_nsec
;
1211 times
[1].tv_nsec
= UTIME_NOW
;
1214 times
[1].tv_nsec
= UTIME_OMIT
;
1216 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
1222 * If the only valid entry in iattr is ctime we can call
1223 * chown(-1,-1) to update the ctime of the file
1225 if ((v9iattr
.valid
& (P9_ATTR_UID
| P9_ATTR_GID
)) ||
1226 ((v9iattr
.valid
& P9_ATTR_CTIME
)
1227 && !((v9iattr
.valid
& P9_ATTR_MASK
) & ~P9_ATTR_CTIME
))) {
1228 if (!(v9iattr
.valid
& P9_ATTR_UID
)) {
1231 if (!(v9iattr
.valid
& P9_ATTR_GID
)) {
1234 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9iattr
.uid
,
1240 if (v9iattr
.valid
& (P9_ATTR_SIZE
)) {
1241 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9iattr
.size
);
1250 pdu_complete(pdu
, err
);
1253 static int v9fs_walk_marshal(V9fsPDU
*pdu
, uint16_t nwnames
, V9fsQID
*qids
)
1259 err
= pdu_marshal(pdu
, offset
, "w", nwnames
);
1264 for (i
= 0; i
< nwnames
; i
++) {
1265 err
= pdu_marshal(pdu
, offset
, "Q", &qids
[i
]);
1274 static bool name_is_illegal(const char *name
)
1276 return !*name
|| strchr(name
, '/') != NULL
;
1279 static bool not_same_qid(const V9fsQID
*qid1
, const V9fsQID
*qid2
)
1282 qid1
->type
!= qid2
->type
||
1283 qid1
->version
!= qid2
->version
||
1284 qid1
->path
!= qid2
->path
;
1287 static void coroutine_fn
v9fs_walk(void *opaque
)
1290 V9fsQID
*qids
= NULL
;
1292 V9fsPath dpath
, path
;
1296 int32_t fid
, newfid
;
1297 V9fsString
*wnames
= NULL
;
1299 V9fsFidState
*newfidp
= NULL
;
1300 V9fsPDU
*pdu
= opaque
;
1301 V9fsState
*s
= pdu
->s
;
1304 err
= pdu_unmarshal(pdu
, offset
, "ddw", &fid
, &newfid
, &nwnames
);
1306 pdu_complete(pdu
, err
);
1311 trace_v9fs_walk(pdu
->tag
, pdu
->id
, fid
, newfid
, nwnames
);
1313 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1314 wnames
= g_malloc0(sizeof(wnames
[0]) * nwnames
);
1315 qids
= g_malloc0(sizeof(qids
[0]) * nwnames
);
1316 for (i
= 0; i
< nwnames
; i
++) {
1317 err
= pdu_unmarshal(pdu
, offset
, "s", &wnames
[i
]);
1321 if (name_is_illegal(wnames
[i
].data
)) {
1327 } else if (nwnames
> P9_MAXWELEM
) {
1331 fidp
= get_fid(pdu
, fid
);
1337 v9fs_path_init(&dpath
);
1338 v9fs_path_init(&path
);
1340 err
= fid_to_qid(pdu
, fidp
, &qid
);
1346 * Both dpath and path initially poin to fidp.
1347 * Needed to handle request with nwnames == 0
1349 v9fs_path_copy(&dpath
, &fidp
->path
);
1350 v9fs_path_copy(&path
, &fidp
->path
);
1351 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1352 if (not_same_qid(&pdu
->s
->root_qid
, &qid
) ||
1353 strcmp("..", wnames
[name_idx
].data
)) {
1354 err
= v9fs_co_name_to_path(pdu
, &dpath
, wnames
[name_idx
].data
,
1360 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1364 stat_to_qid(&stbuf
, &qid
);
1365 v9fs_path_copy(&dpath
, &path
);
1367 memcpy(&qids
[name_idx
], &qid
, sizeof(qid
));
1369 if (fid
== newfid
) {
1370 if (fidp
->fid_type
!= P9_FID_NONE
) {
1374 v9fs_path_copy(&fidp
->path
, &path
);
1376 newfidp
= alloc_fid(s
, newfid
);
1377 if (newfidp
== NULL
) {
1381 newfidp
->uid
= fidp
->uid
;
1382 v9fs_path_copy(&newfidp
->path
, &path
);
1384 err
= v9fs_walk_marshal(pdu
, nwnames
, qids
);
1385 trace_v9fs_walk_return(pdu
->tag
, pdu
->id
, nwnames
, qids
);
1389 put_fid(pdu
, newfidp
);
1391 v9fs_path_free(&dpath
);
1392 v9fs_path_free(&path
);
1394 pdu_complete(pdu
, err
);
1395 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1396 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1397 v9fs_string_free(&wnames
[name_idx
]);
1404 static int32_t coroutine_fn
get_iounit(V9fsPDU
*pdu
, V9fsPath
*path
)
1406 struct statfs stbuf
;
1408 V9fsState
*s
= pdu
->s
;
1411 * iounit should be multiples of f_bsize (host filesystem block size
1412 * and as well as less than (client msize - P9_IOHDRSZ))
1414 if (!v9fs_co_statfs(pdu
, path
, &stbuf
)) {
1415 iounit
= stbuf
.f_bsize
;
1416 iounit
*= (s
->msize
- P9_IOHDRSZ
)/stbuf
.f_bsize
;
1419 iounit
= s
->msize
- P9_IOHDRSZ
;
1424 static void coroutine_fn
v9fs_open(void *opaque
)
1435 V9fsPDU
*pdu
= opaque
;
1436 V9fsState
*s
= pdu
->s
;
1438 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1439 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &mode
);
1442 err
= pdu_unmarshal(pdu
, offset
, "db", &fid
, &modebyte
);
1448 trace_v9fs_open(pdu
->tag
, pdu
->id
, fid
, mode
);
1450 fidp
= get_fid(pdu
, fid
);
1455 if (fidp
->fid_type
!= P9_FID_NONE
) {
1460 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1464 stat_to_qid(&stbuf
, &qid
);
1465 if (S_ISDIR(stbuf
.st_mode
)) {
1466 err
= v9fs_co_opendir(pdu
, fidp
);
1470 fidp
->fid_type
= P9_FID_DIR
;
1471 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, 0);
1477 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1478 flags
= get_dotl_openflags(s
, mode
);
1480 flags
= omode_to_uflags(mode
);
1482 if (is_ro_export(&s
->ctx
)) {
1483 if (mode
& O_WRONLY
|| mode
& O_RDWR
||
1484 mode
& O_APPEND
|| mode
& O_TRUNC
) {
1489 err
= v9fs_co_open(pdu
, fidp
, flags
);
1493 fidp
->fid_type
= P9_FID_FILE
;
1494 fidp
->open_flags
= flags
;
1495 if (flags
& O_EXCL
) {
1497 * We let the host file system do O_EXCL check
1498 * We should not reclaim such fd
1500 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1502 iounit
= get_iounit(pdu
, &fidp
->path
);
1503 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1509 trace_v9fs_open_return(pdu
->tag
, pdu
->id
,
1510 qid
.type
, qid
.version
, qid
.path
, iounit
);
1514 pdu_complete(pdu
, err
);
1517 static void coroutine_fn
v9fs_lcreate(void *opaque
)
1519 int32_t dfid
, flags
, mode
;
1528 V9fsPDU
*pdu
= opaque
;
1530 v9fs_string_init(&name
);
1531 err
= pdu_unmarshal(pdu
, offset
, "dsddd", &dfid
,
1532 &name
, &flags
, &mode
, &gid
);
1536 trace_v9fs_lcreate(pdu
->tag
, pdu
->id
, dfid
, flags
, mode
, gid
);
1538 if (name_is_illegal(name
.data
)) {
1543 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
1548 fidp
= get_fid(pdu
, dfid
);
1553 if (fidp
->fid_type
!= P9_FID_NONE
) {
1558 flags
= get_dotl_openflags(pdu
->s
, flags
);
1559 err
= v9fs_co_open2(pdu
, fidp
, &name
, gid
,
1560 flags
| O_CREAT
, mode
, &stbuf
);
1564 fidp
->fid_type
= P9_FID_FILE
;
1565 fidp
->open_flags
= flags
;
1566 if (flags
& O_EXCL
) {
1568 * We let the host file system do O_EXCL check
1569 * We should not reclaim such fd
1571 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1573 iounit
= get_iounit(pdu
, &fidp
->path
);
1574 stat_to_qid(&stbuf
, &qid
);
1575 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1580 trace_v9fs_lcreate_return(pdu
->tag
, pdu
->id
,
1581 qid
.type
, qid
.version
, qid
.path
, iounit
);
1585 pdu_complete(pdu
, err
);
1586 v9fs_string_free(&name
);
1589 static void coroutine_fn
v9fs_fsync(void *opaque
)
1596 V9fsPDU
*pdu
= opaque
;
1598 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &datasync
);
1602 trace_v9fs_fsync(pdu
->tag
, pdu
->id
, fid
, datasync
);
1604 fidp
= get_fid(pdu
, fid
);
1609 err
= v9fs_co_fsync(pdu
, fidp
, datasync
);
1615 pdu_complete(pdu
, err
);
1618 static void coroutine_fn
v9fs_clunk(void *opaque
)
1624 V9fsPDU
*pdu
= opaque
;
1625 V9fsState
*s
= pdu
->s
;
1627 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
1631 trace_v9fs_clunk(pdu
->tag
, pdu
->id
, fid
);
1633 fidp
= clunk_fid(s
, fid
);
1639 * Bump the ref so that put_fid will
1643 err
= put_fid(pdu
, fidp
);
1648 pdu_complete(pdu
, err
);
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 pdu
->s
->transport
->init_out_iov_from_pdu(pdu
, &iov
, &niov
);
1673 pdu
->s
->transport
->init_in_iov_from_pdu(pdu
, &iov
, &niov
, size
+ skip
);
1676 qemu_iovec_init_external(&elem
, iov
, niov
);
1677 qemu_iovec_init(qiov
, niov
);
1678 qemu_iovec_concat(qiov
, &elem
, skip
, size
);
1681 static int v9fs_xattr_read(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1682 uint64_t off
, uint32_t max_count
)
1686 uint64_t read_count
;
1687 QEMUIOVector qiov_full
;
1689 if (fidp
->fs
.xattr
.len
< off
) {
1692 read_count
= fidp
->fs
.xattr
.len
- off
;
1694 if (read_count
> max_count
) {
1695 read_count
= max_count
;
1697 err
= pdu_marshal(pdu
, offset
, "d", read_count
);
1703 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, read_count
, false);
1704 err
= v9fs_pack(qiov_full
.iov
, qiov_full
.niov
, 0,
1705 ((char *)fidp
->fs
.xattr
.value
) + off
,
1707 qemu_iovec_destroy(&qiov_full
);
1715 static int coroutine_fn
v9fs_do_readdir_with_stat(V9fsPDU
*pdu
,
1724 off_t saved_dir_pos
;
1725 struct dirent
*dent
;
1727 /* save the directory position */
1728 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1729 if (saved_dir_pos
< 0) {
1730 return saved_dir_pos
;
1734 v9fs_path_init(&path
);
1736 v9fs_readdir_lock(&fidp
->fs
.dir
);
1738 err
= v9fs_co_readdir(pdu
, fidp
, &dent
);
1742 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, dent
->d_name
, &path
);
1746 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1750 err
= stat_to_v9stat(pdu
, &path
, &stbuf
, &v9stat
);
1754 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1755 len
= pdu_marshal(pdu
, 11 + count
, "S", &v9stat
);
1757 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1759 if ((len
!= (v9stat
.size
+ 2)) || ((count
+ len
) > max_count
)) {
1760 /* Ran out of buffer. Set dir back to old position and return */
1761 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1762 v9fs_stat_free(&v9stat
);
1763 v9fs_path_free(&path
);
1767 v9fs_stat_free(&v9stat
);
1768 v9fs_path_free(&path
);
1769 saved_dir_pos
= dent
->d_off
;
1772 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1774 v9fs_path_free(&path
);
1781 static void coroutine_fn
v9fs_read(void *opaque
)
1790 V9fsPDU
*pdu
= opaque
;
1791 V9fsState
*s
= pdu
->s
;
1793 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &max_count
);
1797 trace_v9fs_read(pdu
->tag
, pdu
->id
, fid
, off
, max_count
);
1799 fidp
= get_fid(pdu
, fid
);
1804 if (fidp
->fid_type
== P9_FID_DIR
) {
1807 v9fs_co_rewinddir(pdu
, fidp
);
1809 count
= v9fs_do_readdir_with_stat(pdu
, fidp
, max_count
);
1814 err
= pdu_marshal(pdu
, offset
, "d", count
);
1818 err
+= offset
+ count
;
1819 } else if (fidp
->fid_type
== P9_FID_FILE
) {
1820 QEMUIOVector qiov_full
;
1824 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
+ 4, max_count
, false);
1825 qemu_iovec_init(&qiov
, qiov_full
.niov
);
1827 qemu_iovec_reset(&qiov
);
1828 qemu_iovec_concat(&qiov
, &qiov_full
, count
, qiov_full
.size
- count
);
1830 print_sg(qiov
.iov
, qiov
.niov
);
1832 /* Loop in case of EINTR */
1834 len
= v9fs_co_preadv(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
1839 } while (len
== -EINTR
&& !pdu
->cancelled
);
1841 /* IO error return the error */
1843 goto out_free_iovec
;
1845 } while (count
< max_count
&& len
> 0);
1846 err
= pdu_marshal(pdu
, offset
, "d", count
);
1848 goto out_free_iovec
;
1850 err
+= offset
+ count
;
1852 qemu_iovec_destroy(&qiov
);
1853 qemu_iovec_destroy(&qiov_full
);
1854 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
1855 err
= v9fs_xattr_read(s
, pdu
, fidp
, off
, max_count
);
1859 trace_v9fs_read_return(pdu
->tag
, pdu
->id
, count
, err
);
1863 pdu_complete(pdu
, err
);
1866 static size_t v9fs_readdir_data_size(V9fsString
*name
)
1869 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1870 * size of type (1) + size of name.size (2) + strlen(name.data)
1872 return 24 + v9fs_string_size(name
);
1875 static int coroutine_fn
v9fs_do_readdir(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1883 off_t saved_dir_pos
;
1884 struct dirent
*dent
;
1886 /* save the directory position */
1887 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1888 if (saved_dir_pos
< 0) {
1889 return saved_dir_pos
;
1893 v9fs_readdir_lock(&fidp
->fs
.dir
);
1895 err
= v9fs_co_readdir(pdu
, fidp
, &dent
);
1899 v9fs_string_init(&name
);
1900 v9fs_string_sprintf(&name
, "%s", dent
->d_name
);
1901 if ((count
+ v9fs_readdir_data_size(&name
)) > max_count
) {
1902 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1904 /* Ran out of buffer. Set dir back to old position and return */
1905 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1906 v9fs_string_free(&name
);
1910 * Fill up just the path field of qid because the client uses
1911 * only that. To fill the entire qid structure we will have
1912 * to stat each dirent found, which is expensive
1914 size
= MIN(sizeof(dent
->d_ino
), sizeof(qid
.path
));
1915 memcpy(&qid
.path
, &dent
->d_ino
, size
);
1916 /* Fill the other fields with dummy values */
1920 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1921 len
= pdu_marshal(pdu
, 11 + count
, "Qqbs",
1923 dent
->d_type
, &name
);
1925 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1928 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1929 v9fs_string_free(&name
);
1933 v9fs_string_free(&name
);
1934 saved_dir_pos
= dent
->d_off
;
1937 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1945 static void coroutine_fn
v9fs_readdir(void *opaque
)
1951 uint64_t initial_offset
;
1954 V9fsPDU
*pdu
= opaque
;
1956 retval
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
,
1957 &initial_offset
, &max_count
);
1961 trace_v9fs_readdir(pdu
->tag
, pdu
->id
, fid
, initial_offset
, max_count
);
1963 fidp
= get_fid(pdu
, fid
);
1968 if (!fidp
->fs
.dir
.stream
) {
1972 if (initial_offset
== 0) {
1973 v9fs_co_rewinddir(pdu
, fidp
);
1975 v9fs_co_seekdir(pdu
, fidp
, initial_offset
);
1977 count
= v9fs_do_readdir(pdu
, fidp
, max_count
);
1982 retval
= pdu_marshal(pdu
, offset
, "d", count
);
1986 retval
+= count
+ offset
;
1987 trace_v9fs_readdir_return(pdu
->tag
, pdu
->id
, count
, retval
);
1991 pdu_complete(pdu
, retval
);
1994 static int v9fs_xattr_write(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1995 uint64_t off
, uint32_t count
,
1996 struct iovec
*sg
, int cnt
)
2000 uint64_t write_count
;
2004 if (fidp
->fs
.xattr
.len
< off
) {
2008 write_count
= fidp
->fs
.xattr
.len
- off
;
2009 if (write_count
> count
) {
2010 write_count
= count
;
2012 err
= pdu_marshal(pdu
, offset
, "d", write_count
);
2017 fidp
->fs
.xattr
.copied_len
+= write_count
;
2019 * Now copy the content from sg list
2021 for (i
= 0; i
< cnt
; i
++) {
2022 if (write_count
> sg
[i
].iov_len
) {
2023 to_copy
= sg
[i
].iov_len
;
2025 to_copy
= write_count
;
2027 memcpy((char *)fidp
->fs
.xattr
.value
+ off
, sg
[i
].iov_base
, to_copy
);
2028 /* updating vs->off since we are not using below */
2030 write_count
-= to_copy
;
2036 static void coroutine_fn
v9fs_write(void *opaque
)
2046 V9fsPDU
*pdu
= opaque
;
2047 V9fsState
*s
= pdu
->s
;
2048 QEMUIOVector qiov_full
;
2051 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &count
);
2053 pdu_complete(pdu
, err
);
2057 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, count
, true);
2058 trace_v9fs_write(pdu
->tag
, pdu
->id
, fid
, off
, count
, qiov_full
.niov
);
2060 fidp
= get_fid(pdu
, fid
);
2065 if (fidp
->fid_type
== P9_FID_FILE
) {
2066 if (fidp
->fs
.fd
== -1) {
2070 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
2072 * setxattr operation
2074 err
= v9fs_xattr_write(s
, pdu
, fidp
, off
, count
,
2075 qiov_full
.iov
, qiov_full
.niov
);
2081 qemu_iovec_init(&qiov
, qiov_full
.niov
);
2083 qemu_iovec_reset(&qiov
);
2084 qemu_iovec_concat(&qiov
, &qiov_full
, total
, qiov_full
.size
- total
);
2086 print_sg(qiov
.iov
, qiov
.niov
);
2088 /* Loop in case of EINTR */
2090 len
= v9fs_co_pwritev(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
2095 } while (len
== -EINTR
&& !pdu
->cancelled
);
2097 /* IO error return the error */
2101 } while (total
< count
&& len
> 0);
2104 err
= pdu_marshal(pdu
, offset
, "d", total
);
2109 trace_v9fs_write_return(pdu
->tag
, pdu
->id
, total
, err
);
2111 qemu_iovec_destroy(&qiov
);
2115 qemu_iovec_destroy(&qiov_full
);
2116 pdu_complete(pdu
, err
);
2119 static void coroutine_fn
v9fs_create(void *opaque
)
2131 V9fsString extension
;
2133 V9fsPDU
*pdu
= opaque
;
2135 v9fs_path_init(&path
);
2136 v9fs_string_init(&name
);
2137 v9fs_string_init(&extension
);
2138 err
= pdu_unmarshal(pdu
, offset
, "dsdbs", &fid
, &name
,
2139 &perm
, &mode
, &extension
);
2143 trace_v9fs_create(pdu
->tag
, pdu
->id
, fid
, name
.data
, perm
, mode
);
2145 if (name_is_illegal(name
.data
)) {
2150 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2155 fidp
= get_fid(pdu
, fid
);
2160 if (fidp
->fid_type
!= P9_FID_NONE
) {
2164 if (perm
& P9_STAT_MODE_DIR
) {
2165 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, perm
& 0777,
2166 fidp
->uid
, -1, &stbuf
);
2170 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2174 v9fs_path_copy(&fidp
->path
, &path
);
2175 err
= v9fs_co_opendir(pdu
, fidp
);
2179 fidp
->fid_type
= P9_FID_DIR
;
2180 } else if (perm
& P9_STAT_MODE_SYMLINK
) {
2181 err
= v9fs_co_symlink(pdu
, fidp
, &name
,
2182 extension
.data
, -1 , &stbuf
);
2186 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2190 v9fs_path_copy(&fidp
->path
, &path
);
2191 } else if (perm
& P9_STAT_MODE_LINK
) {
2192 int32_t ofid
= atoi(extension
.data
);
2193 V9fsFidState
*ofidp
= get_fid(pdu
, ofid
);
2194 if (ofidp
== NULL
) {
2198 err
= v9fs_co_link(pdu
, ofidp
, fidp
, &name
);
2199 put_fid(pdu
, ofidp
);
2203 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2205 fidp
->fid_type
= P9_FID_NONE
;
2208 v9fs_path_copy(&fidp
->path
, &path
);
2209 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2211 fidp
->fid_type
= P9_FID_NONE
;
2214 } else if (perm
& P9_STAT_MODE_DEVICE
) {
2216 uint32_t major
, minor
;
2219 if (sscanf(extension
.data
, "%c %u %u", &ctype
, &major
, &minor
) != 3) {
2236 nmode
|= perm
& 0777;
2237 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2238 makedev(major
, minor
), nmode
, &stbuf
);
2242 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2246 v9fs_path_copy(&fidp
->path
, &path
);
2247 } else if (perm
& P9_STAT_MODE_NAMED_PIPE
) {
2248 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2249 0, S_IFIFO
| (perm
& 0777), &stbuf
);
2253 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2257 v9fs_path_copy(&fidp
->path
, &path
);
2258 } else if (perm
& P9_STAT_MODE_SOCKET
) {
2259 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2260 0, S_IFSOCK
| (perm
& 0777), &stbuf
);
2264 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2268 v9fs_path_copy(&fidp
->path
, &path
);
2270 err
= v9fs_co_open2(pdu
, fidp
, &name
, -1,
2271 omode_to_uflags(mode
)|O_CREAT
, perm
, &stbuf
);
2275 fidp
->fid_type
= P9_FID_FILE
;
2276 fidp
->open_flags
= omode_to_uflags(mode
);
2277 if (fidp
->open_flags
& O_EXCL
) {
2279 * We let the host file system do O_EXCL check
2280 * We should not reclaim such fd
2282 fidp
->flags
|= FID_NON_RECLAIMABLE
;
2285 iounit
= get_iounit(pdu
, &fidp
->path
);
2286 stat_to_qid(&stbuf
, &qid
);
2287 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
2292 trace_v9fs_create_return(pdu
->tag
, pdu
->id
,
2293 qid
.type
, qid
.version
, qid
.path
, iounit
);
2297 pdu_complete(pdu
, err
);
2298 v9fs_string_free(&name
);
2299 v9fs_string_free(&extension
);
2300 v9fs_path_free(&path
);
2303 static void coroutine_fn
v9fs_symlink(void *opaque
)
2305 V9fsPDU
*pdu
= opaque
;
2308 V9fsFidState
*dfidp
;
2316 v9fs_string_init(&name
);
2317 v9fs_string_init(&symname
);
2318 err
= pdu_unmarshal(pdu
, offset
, "dssd", &dfid
, &name
, &symname
, &gid
);
2322 trace_v9fs_symlink(pdu
->tag
, pdu
->id
, dfid
, name
.data
, symname
.data
, gid
);
2324 if (name_is_illegal(name
.data
)) {
2329 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2334 dfidp
= get_fid(pdu
, dfid
);
2335 if (dfidp
== NULL
) {
2339 err
= v9fs_co_symlink(pdu
, dfidp
, &name
, symname
.data
, gid
, &stbuf
);
2343 stat_to_qid(&stbuf
, &qid
);
2344 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
2349 trace_v9fs_symlink_return(pdu
->tag
, pdu
->id
,
2350 qid
.type
, qid
.version
, qid
.path
);
2352 put_fid(pdu
, dfidp
);
2354 pdu_complete(pdu
, err
);
2355 v9fs_string_free(&name
);
2356 v9fs_string_free(&symname
);
2359 static void coroutine_fn
v9fs_flush(void *opaque
)
2364 V9fsPDU
*cancel_pdu
= NULL
;
2365 V9fsPDU
*pdu
= opaque
;
2366 V9fsState
*s
= pdu
->s
;
2368 err
= pdu_unmarshal(pdu
, offset
, "w", &tag
);
2370 pdu_complete(pdu
, err
);
2373 trace_v9fs_flush(pdu
->tag
, pdu
->id
, tag
);
2375 if (pdu
->tag
== tag
) {
2376 error_report("Warning: the guest sent a self-referencing 9P flush request");
2378 QLIST_FOREACH(cancel_pdu
, &s
->active_list
, next
) {
2379 if (cancel_pdu
->tag
== tag
) {
2385 cancel_pdu
->cancelled
= 1;
2387 * Wait for pdu to complete.
2389 qemu_co_queue_wait(&cancel_pdu
->complete
, NULL
);
2390 cancel_pdu
->cancelled
= 0;
2391 pdu_free(cancel_pdu
);
2393 pdu_complete(pdu
, 7);
2396 static void coroutine_fn
v9fs_link(void *opaque
)
2398 V9fsPDU
*pdu
= opaque
;
2399 int32_t dfid
, oldfid
;
2400 V9fsFidState
*dfidp
, *oldfidp
;
2405 v9fs_string_init(&name
);
2406 err
= pdu_unmarshal(pdu
, offset
, "dds", &dfid
, &oldfid
, &name
);
2410 trace_v9fs_link(pdu
->tag
, pdu
->id
, dfid
, oldfid
, name
.data
);
2412 if (name_is_illegal(name
.data
)) {
2417 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2422 dfidp
= get_fid(pdu
, dfid
);
2423 if (dfidp
== NULL
) {
2428 oldfidp
= get_fid(pdu
, oldfid
);
2429 if (oldfidp
== NULL
) {
2433 err
= v9fs_co_link(pdu
, oldfidp
, dfidp
, &name
);
2437 put_fid(pdu
, oldfidp
);
2439 put_fid(pdu
, dfidp
);
2441 v9fs_string_free(&name
);
2442 pdu_complete(pdu
, err
);
2445 /* Only works with path name based fid */
2446 static void coroutine_fn
v9fs_remove(void *opaque
)
2452 V9fsPDU
*pdu
= opaque
;
2454 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
2458 trace_v9fs_remove(pdu
->tag
, pdu
->id
, fid
);
2460 fidp
= get_fid(pdu
, fid
);
2465 /* if fs driver is not path based, return EOPNOTSUPP */
2466 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2471 * IF the file is unlinked, we cannot reopen
2472 * the file later. So don't reclaim fd
2474 err
= v9fs_mark_fids_unreclaim(pdu
, &fidp
->path
);
2478 err
= v9fs_co_remove(pdu
, &fidp
->path
);
2483 /* For TREMOVE we need to clunk the fid even on failed remove */
2484 clunk_fid(pdu
->s
, fidp
->fid
);
2487 pdu_complete(pdu
, err
);
2490 static void coroutine_fn
v9fs_unlinkat(void *opaque
)
2494 int32_t dfid
, flags
;
2497 V9fsFidState
*dfidp
;
2498 V9fsPDU
*pdu
= opaque
;
2500 v9fs_string_init(&name
);
2501 err
= pdu_unmarshal(pdu
, offset
, "dsd", &dfid
, &name
, &flags
);
2506 if (name_is_illegal(name
.data
)) {
2511 if (!strcmp(".", name
.data
)) {
2516 if (!strcmp("..", name
.data
)) {
2521 dfidp
= get_fid(pdu
, dfid
);
2522 if (dfidp
== NULL
) {
2527 * IF the file is unlinked, we cannot reopen
2528 * the file later. So don't reclaim fd
2530 v9fs_path_init(&path
);
2531 err
= v9fs_co_name_to_path(pdu
, &dfidp
->path
, name
.data
, &path
);
2535 err
= v9fs_mark_fids_unreclaim(pdu
, &path
);
2539 err
= v9fs_co_unlinkat(pdu
, &dfidp
->path
, &name
, flags
);
2544 put_fid(pdu
, dfidp
);
2545 v9fs_path_free(&path
);
2547 pdu_complete(pdu
, err
);
2548 v9fs_string_free(&name
);
2552 /* Only works with path name based fid */
2553 static int coroutine_fn
v9fs_complete_rename(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2560 V9fsFidState
*tfidp
;
2561 V9fsState
*s
= pdu
->s
;
2562 V9fsFidState
*dirfidp
= NULL
;
2563 char *old_name
, *new_name
;
2565 v9fs_path_init(&new_path
);
2566 if (newdirfid
!= -1) {
2567 dirfidp
= get_fid(pdu
, newdirfid
);
2568 if (dirfidp
== NULL
) {
2572 if (fidp
->fid_type
!= P9_FID_NONE
) {
2576 v9fs_co_name_to_path(pdu
, &dirfidp
->path
, name
->data
, &new_path
);
2578 old_name
= fidp
->path
.data
;
2579 end
= strrchr(old_name
, '/');
2585 new_name
= g_malloc0(end
- old_name
+ name
->size
+ 1);
2586 strncat(new_name
, old_name
, end
- old_name
);
2587 strncat(new_name
+ (end
- old_name
), name
->data
, name
->size
);
2588 v9fs_co_name_to_path(pdu
, NULL
, new_name
, &new_path
);
2591 err
= v9fs_co_rename(pdu
, &fidp
->path
, &new_path
);
2596 * Fixup fid's pointing to the old name to
2597 * start pointing to the new name
2599 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2600 if (v9fs_path_is_ancestor(&fidp
->path
, &tfidp
->path
)) {
2601 /* replace the name */
2602 v9fs_fix_path(&tfidp
->path
, &new_path
, strlen(fidp
->path
.data
));
2607 put_fid(pdu
, dirfidp
);
2609 v9fs_path_free(&new_path
);
2614 /* Only works with path name based fid */
2615 static void coroutine_fn
v9fs_rename(void *opaque
)
2623 V9fsPDU
*pdu
= opaque
;
2624 V9fsState
*s
= pdu
->s
;
2626 v9fs_string_init(&name
);
2627 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newdirfid
, &name
);
2632 if (name_is_illegal(name
.data
)) {
2637 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2642 fidp
= get_fid(pdu
, fid
);
2647 if (fidp
->fid_type
!= P9_FID_NONE
) {
2651 /* if fs driver is not path based, return EOPNOTSUPP */
2652 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2656 v9fs_path_write_lock(s
);
2657 err
= v9fs_complete_rename(pdu
, fidp
, newdirfid
, &name
);
2658 v9fs_path_unlock(s
);
2665 pdu_complete(pdu
, err
);
2666 v9fs_string_free(&name
);
2669 static void coroutine_fn
v9fs_fix_fid_paths(V9fsPDU
*pdu
, V9fsPath
*olddir
,
2670 V9fsString
*old_name
,
2672 V9fsString
*new_name
)
2674 V9fsFidState
*tfidp
;
2675 V9fsPath oldpath
, newpath
;
2676 V9fsState
*s
= pdu
->s
;
2679 v9fs_path_init(&oldpath
);
2680 v9fs_path_init(&newpath
);
2681 v9fs_co_name_to_path(pdu
, olddir
, old_name
->data
, &oldpath
);
2682 v9fs_co_name_to_path(pdu
, newdir
, new_name
->data
, &newpath
);
2685 * Fixup fid's pointing to the old name to
2686 * start pointing to the new name
2688 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2689 if (v9fs_path_is_ancestor(&oldpath
, &tfidp
->path
)) {
2690 /* replace the name */
2691 v9fs_fix_path(&tfidp
->path
, &newpath
, strlen(oldpath
.data
));
2694 v9fs_path_free(&oldpath
);
2695 v9fs_path_free(&newpath
);
2698 static int coroutine_fn
v9fs_complete_renameat(V9fsPDU
*pdu
, int32_t olddirfid
,
2699 V9fsString
*old_name
,
2701 V9fsString
*new_name
)
2704 V9fsState
*s
= pdu
->s
;
2705 V9fsFidState
*newdirfidp
= NULL
, *olddirfidp
= NULL
;
2707 olddirfidp
= get_fid(pdu
, olddirfid
);
2708 if (olddirfidp
== NULL
) {
2712 if (newdirfid
!= -1) {
2713 newdirfidp
= get_fid(pdu
, newdirfid
);
2714 if (newdirfidp
== NULL
) {
2719 newdirfidp
= get_fid(pdu
, olddirfid
);
2722 err
= v9fs_co_renameat(pdu
, &olddirfidp
->path
, old_name
,
2723 &newdirfidp
->path
, new_name
);
2727 if (s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
) {
2728 /* Only for path based fid we need to do the below fixup */
2729 v9fs_fix_fid_paths(pdu
, &olddirfidp
->path
, old_name
,
2730 &newdirfidp
->path
, new_name
);
2734 put_fid(pdu
, olddirfidp
);
2737 put_fid(pdu
, newdirfidp
);
2742 static void coroutine_fn
v9fs_renameat(void *opaque
)
2746 V9fsPDU
*pdu
= opaque
;
2747 V9fsState
*s
= pdu
->s
;
2748 int32_t olddirfid
, newdirfid
;
2749 V9fsString old_name
, new_name
;
2751 v9fs_string_init(&old_name
);
2752 v9fs_string_init(&new_name
);
2753 err
= pdu_unmarshal(pdu
, offset
, "dsds", &olddirfid
,
2754 &old_name
, &newdirfid
, &new_name
);
2759 if (name_is_illegal(old_name
.data
) || name_is_illegal(new_name
.data
)) {
2764 if (!strcmp(".", old_name
.data
) || !strcmp("..", old_name
.data
) ||
2765 !strcmp(".", new_name
.data
) || !strcmp("..", new_name
.data
)) {
2770 v9fs_path_write_lock(s
);
2771 err
= v9fs_complete_renameat(pdu
, olddirfid
,
2772 &old_name
, newdirfid
, &new_name
);
2773 v9fs_path_unlock(s
);
2779 pdu_complete(pdu
, err
);
2780 v9fs_string_free(&old_name
);
2781 v9fs_string_free(&new_name
);
2784 static void coroutine_fn
v9fs_wstat(void *opaque
)
2793 V9fsPDU
*pdu
= opaque
;
2795 v9fs_stat_init(&v9stat
);
2796 err
= pdu_unmarshal(pdu
, offset
, "dwS", &fid
, &unused
, &v9stat
);
2800 trace_v9fs_wstat(pdu
->tag
, pdu
->id
, fid
,
2801 v9stat
.mode
, v9stat
.atime
, v9stat
.mtime
);
2803 fidp
= get_fid(pdu
, fid
);
2808 /* do we need to sync the file? */
2809 if (donttouch_stat(&v9stat
)) {
2810 err
= v9fs_co_fsync(pdu
, fidp
, 0);
2813 if (v9stat
.mode
!= -1) {
2815 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2819 v9_mode
= stat_to_v9mode(&stbuf
);
2820 if ((v9stat
.mode
& P9_STAT_MODE_TYPE_BITS
) !=
2821 (v9_mode
& P9_STAT_MODE_TYPE_BITS
)) {
2822 /* Attempting to change the type */
2826 err
= v9fs_co_chmod(pdu
, &fidp
->path
,
2827 v9mode_to_mode(v9stat
.mode
,
2828 &v9stat
.extension
));
2833 if (v9stat
.mtime
!= -1 || v9stat
.atime
!= -1) {
2834 struct timespec times
[2];
2835 if (v9stat
.atime
!= -1) {
2836 times
[0].tv_sec
= v9stat
.atime
;
2837 times
[0].tv_nsec
= 0;
2839 times
[0].tv_nsec
= UTIME_OMIT
;
2841 if (v9stat
.mtime
!= -1) {
2842 times
[1].tv_sec
= v9stat
.mtime
;
2843 times
[1].tv_nsec
= 0;
2845 times
[1].tv_nsec
= UTIME_OMIT
;
2847 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
2852 if (v9stat
.n_gid
!= -1 || v9stat
.n_uid
!= -1) {
2853 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9stat
.n_uid
, v9stat
.n_gid
);
2858 if (v9stat
.name
.size
!= 0) {
2859 err
= v9fs_complete_rename(pdu
, fidp
, -1, &v9stat
.name
);
2864 if (v9stat
.length
!= -1) {
2865 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9stat
.length
);
2874 v9fs_stat_free(&v9stat
);
2875 pdu_complete(pdu
, err
);
2878 static int v9fs_fill_statfs(V9fsState
*s
, V9fsPDU
*pdu
, struct statfs
*stbuf
)
2890 int32_t bsize_factor
;
2893 * compute bsize factor based on host file system block size
2896 bsize_factor
= (s
->msize
- P9_IOHDRSZ
)/stbuf
->f_bsize
;
2897 if (!bsize_factor
) {
2900 f_type
= stbuf
->f_type
;
2901 f_bsize
= stbuf
->f_bsize
;
2902 f_bsize
*= bsize_factor
;
2904 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2905 * adjust(divide) the number of blocks, free blocks and available
2906 * blocks by bsize factor
2908 f_blocks
= stbuf
->f_blocks
/bsize_factor
;
2909 f_bfree
= stbuf
->f_bfree
/bsize_factor
;
2910 f_bavail
= stbuf
->f_bavail
/bsize_factor
;
2911 f_files
= stbuf
->f_files
;
2912 f_ffree
= stbuf
->f_ffree
;
2913 fsid_val
= (unsigned int) stbuf
->f_fsid
.__val
[0] |
2914 (unsigned long long)stbuf
->f_fsid
.__val
[1] << 32;
2915 f_namelen
= stbuf
->f_namelen
;
2917 return pdu_marshal(pdu
, offset
, "ddqqqqqqd",
2918 f_type
, f_bsize
, f_blocks
, f_bfree
,
2919 f_bavail
, f_files
, f_ffree
,
2920 fsid_val
, f_namelen
);
2923 static void coroutine_fn
v9fs_statfs(void *opaque
)
2929 struct statfs stbuf
;
2930 V9fsPDU
*pdu
= opaque
;
2931 V9fsState
*s
= pdu
->s
;
2933 retval
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
2937 fidp
= get_fid(pdu
, fid
);
2942 retval
= v9fs_co_statfs(pdu
, &fidp
->path
, &stbuf
);
2946 retval
= v9fs_fill_statfs(s
, pdu
, &stbuf
);
2954 pdu_complete(pdu
, retval
);
2957 static void coroutine_fn
v9fs_mknod(void *opaque
)
2970 V9fsPDU
*pdu
= opaque
;
2972 v9fs_string_init(&name
);
2973 err
= pdu_unmarshal(pdu
, offset
, "dsdddd", &fid
, &name
, &mode
,
2974 &major
, &minor
, &gid
);
2978 trace_v9fs_mknod(pdu
->tag
, pdu
->id
, fid
, mode
, major
, minor
);
2980 if (name_is_illegal(name
.data
)) {
2985 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2990 fidp
= get_fid(pdu
, fid
);
2995 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, gid
,
2996 makedev(major
, minor
), mode
, &stbuf
);
3000 stat_to_qid(&stbuf
, &qid
);
3001 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3006 trace_v9fs_mknod_return(pdu
->tag
, pdu
->id
,
3007 qid
.type
, qid
.version
, qid
.path
);
3011 pdu_complete(pdu
, err
);
3012 v9fs_string_free(&name
);
3016 * Implement posix byte range locking code
3017 * Server side handling of locking code is very simple, because 9p server in
3018 * QEMU can handle only one client. And most of the lock handling
3019 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3020 * do any thing in * qemu 9p server side lock code path.
3021 * So when a TLOCK request comes, always return success
3023 static void coroutine_fn
v9fs_lock(void *opaque
)
3029 int32_t fid
, err
= 0;
3030 V9fsPDU
*pdu
= opaque
;
3032 v9fs_string_init(&flock
.client_id
);
3033 err
= pdu_unmarshal(pdu
, offset
, "dbdqqds", &fid
, &flock
.type
,
3034 &flock
.flags
, &flock
.start
, &flock
.length
,
3035 &flock
.proc_id
, &flock
.client_id
);
3039 trace_v9fs_lock(pdu
->tag
, pdu
->id
, fid
,
3040 flock
.type
, flock
.start
, flock
.length
);
3043 /* We support only block flag now (that too ignored currently) */
3044 if (flock
.flags
& ~P9_LOCK_FLAGS_BLOCK
) {
3048 fidp
= get_fid(pdu
, fid
);
3053 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3057 err
= pdu_marshal(pdu
, offset
, "b", P9_LOCK_SUCCESS
);
3062 trace_v9fs_lock_return(pdu
->tag
, pdu
->id
, P9_LOCK_SUCCESS
);
3066 pdu_complete(pdu
, err
);
3067 v9fs_string_free(&flock
.client_id
);
3071 * When a TGETLOCK request comes, always return success because all lock
3072 * handling is done by client's VFS layer.
3074 static void coroutine_fn
v9fs_getlock(void *opaque
)
3080 int32_t fid
, err
= 0;
3081 V9fsPDU
*pdu
= opaque
;
3083 v9fs_string_init(&glock
.client_id
);
3084 err
= pdu_unmarshal(pdu
, offset
, "dbqqds", &fid
, &glock
.type
,
3085 &glock
.start
, &glock
.length
, &glock
.proc_id
,
3090 trace_v9fs_getlock(pdu
->tag
, pdu
->id
, fid
,
3091 glock
.type
, glock
.start
, glock
.length
);
3093 fidp
= get_fid(pdu
, fid
);
3098 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3102 glock
.type
= P9_LOCK_TYPE_UNLCK
;
3103 err
= pdu_marshal(pdu
, offset
, "bqqds", glock
.type
,
3104 glock
.start
, glock
.length
, glock
.proc_id
,
3110 trace_v9fs_getlock_return(pdu
->tag
, pdu
->id
, glock
.type
, glock
.start
,
3111 glock
.length
, glock
.proc_id
);
3115 pdu_complete(pdu
, err
);
3116 v9fs_string_free(&glock
.client_id
);
3119 static void coroutine_fn
v9fs_mkdir(void *opaque
)
3121 V9fsPDU
*pdu
= opaque
;
3132 v9fs_string_init(&name
);
3133 err
= pdu_unmarshal(pdu
, offset
, "dsdd", &fid
, &name
, &mode
, &gid
);
3137 trace_v9fs_mkdir(pdu
->tag
, pdu
->id
, fid
, name
.data
, mode
, gid
);
3139 if (name_is_illegal(name
.data
)) {
3144 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3149 fidp
= get_fid(pdu
, fid
);
3154 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, mode
, fidp
->uid
, gid
, &stbuf
);
3158 stat_to_qid(&stbuf
, &qid
);
3159 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3164 trace_v9fs_mkdir_return(pdu
->tag
, pdu
->id
,
3165 qid
.type
, qid
.version
, qid
.path
, err
);
3169 pdu_complete(pdu
, err
);
3170 v9fs_string_free(&name
);
3173 static void coroutine_fn
v9fs_xattrwalk(void *opaque
)
3179 int32_t fid
, newfid
;
3180 V9fsFidState
*file_fidp
;
3181 V9fsFidState
*xattr_fidp
= NULL
;
3182 V9fsPDU
*pdu
= opaque
;
3183 V9fsState
*s
= pdu
->s
;
3185 v9fs_string_init(&name
);
3186 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newfid
, &name
);
3190 trace_v9fs_xattrwalk(pdu
->tag
, pdu
->id
, fid
, newfid
, name
.data
);
3192 file_fidp
= get_fid(pdu
, fid
);
3193 if (file_fidp
== NULL
) {
3197 xattr_fidp
= alloc_fid(s
, newfid
);
3198 if (xattr_fidp
== NULL
) {
3202 v9fs_path_copy(&xattr_fidp
->path
, &file_fidp
->path
);
3203 if (!v9fs_string_size(&name
)) {
3205 * listxattr request. Get the size first
3207 size
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
, NULL
, 0);
3210 clunk_fid(s
, xattr_fidp
->fid
);
3214 * Read the xattr value
3216 xattr_fidp
->fs
.xattr
.len
= size
;
3217 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3218 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3220 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3221 err
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
,
3222 xattr_fidp
->fs
.xattr
.value
,
3223 xattr_fidp
->fs
.xattr
.len
);
3225 clunk_fid(s
, xattr_fidp
->fid
);
3229 err
= pdu_marshal(pdu
, offset
, "q", size
);
3236 * specific xattr fid. We check for xattr
3237 * presence also collect the xattr size
3239 size
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3243 clunk_fid(s
, xattr_fidp
->fid
);
3247 * Read the xattr value
3249 xattr_fidp
->fs
.xattr
.len
= size
;
3250 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3251 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3253 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3254 err
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3255 &name
, xattr_fidp
->fs
.xattr
.value
,
3256 xattr_fidp
->fs
.xattr
.len
);
3258 clunk_fid(s
, xattr_fidp
->fid
);
3262 err
= pdu_marshal(pdu
, offset
, "q", size
);
3268 trace_v9fs_xattrwalk_return(pdu
->tag
, pdu
->id
, size
);
3270 put_fid(pdu
, file_fidp
);
3272 put_fid(pdu
, xattr_fidp
);
3275 pdu_complete(pdu
, err
);
3276 v9fs_string_free(&name
);
3279 static void coroutine_fn
v9fs_xattrcreate(void *opaque
)
3287 V9fsFidState
*file_fidp
;
3288 V9fsFidState
*xattr_fidp
;
3289 V9fsPDU
*pdu
= opaque
;
3291 v9fs_string_init(&name
);
3292 err
= pdu_unmarshal(pdu
, offset
, "dsqd", &fid
, &name
, &size
, &flags
);
3296 trace_v9fs_xattrcreate(pdu
->tag
, pdu
->id
, fid
, name
.data
, size
, flags
);
3298 if (size
> XATTR_SIZE_MAX
) {
3303 file_fidp
= get_fid(pdu
, fid
);
3304 if (file_fidp
== NULL
) {
3308 if (file_fidp
->fid_type
!= P9_FID_NONE
) {
3313 /* Make the file fid point to xattr */
3314 xattr_fidp
= file_fidp
;
3315 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3316 xattr_fidp
->fs
.xattr
.copied_len
= 0;
3317 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= false;
3318 xattr_fidp
->fs
.xattr
.len
= size
;
3319 xattr_fidp
->fs
.xattr
.flags
= flags
;
3320 v9fs_string_init(&xattr_fidp
->fs
.xattr
.name
);
3321 v9fs_string_copy(&xattr_fidp
->fs
.xattr
.name
, &name
);
3322 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3325 put_fid(pdu
, file_fidp
);
3327 pdu_complete(pdu
, err
);
3328 v9fs_string_free(&name
);
3331 static void coroutine_fn
v9fs_readlink(void *opaque
)
3333 V9fsPDU
*pdu
= opaque
;
3340 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
3344 trace_v9fs_readlink(pdu
->tag
, pdu
->id
, fid
);
3345 fidp
= get_fid(pdu
, fid
);
3351 v9fs_string_init(&target
);
3352 err
= v9fs_co_readlink(pdu
, &fidp
->path
, &target
);
3356 err
= pdu_marshal(pdu
, offset
, "s", &target
);
3358 v9fs_string_free(&target
);
3362 trace_v9fs_readlink_return(pdu
->tag
, pdu
->id
, target
.data
);
3363 v9fs_string_free(&target
);
3367 pdu_complete(pdu
, err
);
3370 static CoroutineEntry
*pdu_co_handlers
[] = {
3371 [P9_TREADDIR
] = v9fs_readdir
,
3372 [P9_TSTATFS
] = v9fs_statfs
,
3373 [P9_TGETATTR
] = v9fs_getattr
,
3374 [P9_TSETATTR
] = v9fs_setattr
,
3375 [P9_TXATTRWALK
] = v9fs_xattrwalk
,
3376 [P9_TXATTRCREATE
] = v9fs_xattrcreate
,
3377 [P9_TMKNOD
] = v9fs_mknod
,
3378 [P9_TRENAME
] = v9fs_rename
,
3379 [P9_TLOCK
] = v9fs_lock
,
3380 [P9_TGETLOCK
] = v9fs_getlock
,
3381 [P9_TRENAMEAT
] = v9fs_renameat
,
3382 [P9_TREADLINK
] = v9fs_readlink
,
3383 [P9_TUNLINKAT
] = v9fs_unlinkat
,
3384 [P9_TMKDIR
] = v9fs_mkdir
,
3385 [P9_TVERSION
] = v9fs_version
,
3386 [P9_TLOPEN
] = v9fs_open
,
3387 [P9_TATTACH
] = v9fs_attach
,
3388 [P9_TSTAT
] = v9fs_stat
,
3389 [P9_TWALK
] = v9fs_walk
,
3390 [P9_TCLUNK
] = v9fs_clunk
,
3391 [P9_TFSYNC
] = v9fs_fsync
,
3392 [P9_TOPEN
] = v9fs_open
,
3393 [P9_TREAD
] = v9fs_read
,
3395 [P9_TAUTH
] = v9fs_auth
,
3397 [P9_TFLUSH
] = v9fs_flush
,
3398 [P9_TLINK
] = v9fs_link
,
3399 [P9_TSYMLINK
] = v9fs_symlink
,
3400 [P9_TCREATE
] = v9fs_create
,
3401 [P9_TLCREATE
] = v9fs_lcreate
,
3402 [P9_TWRITE
] = v9fs_write
,
3403 [P9_TWSTAT
] = v9fs_wstat
,
3404 [P9_TREMOVE
] = v9fs_remove
,
3407 static void coroutine_fn
v9fs_op_not_supp(void *opaque
)
3409 V9fsPDU
*pdu
= opaque
;
3410 pdu_complete(pdu
, -EOPNOTSUPP
);
3413 static void coroutine_fn
v9fs_fs_ro(void *opaque
)
3415 V9fsPDU
*pdu
= opaque
;
3416 pdu_complete(pdu
, -EROFS
);
3419 static inline bool is_read_only_op(V9fsPDU
*pdu
)
3446 void pdu_submit(V9fsPDU
*pdu
)
3449 CoroutineEntry
*handler
;
3450 V9fsState
*s
= pdu
->s
;
3452 if (pdu
->id
>= ARRAY_SIZE(pdu_co_handlers
) ||
3453 (pdu_co_handlers
[pdu
->id
] == NULL
)) {
3454 handler
= v9fs_op_not_supp
;
3456 handler
= pdu_co_handlers
[pdu
->id
];
3459 if (is_ro_export(&s
->ctx
) && !is_read_only_op(pdu
)) {
3460 handler
= v9fs_fs_ro
;
3462 co
= qemu_coroutine_create(handler
, pdu
);
3463 qemu_coroutine_enter(co
);
3466 /* Returns 0 on success, 1 on failure. */
3467 int v9fs_device_realize_common(V9fsState
*s
, Error
**errp
)
3475 /* initialize pdu allocator */
3476 QLIST_INIT(&s
->free_list
);
3477 QLIST_INIT(&s
->active_list
);
3478 for (i
= 0; i
< MAX_REQ
; i
++) {
3479 QLIST_INSERT_HEAD(&s
->free_list
, &s
->pdus
[i
], next
);
3484 v9fs_path_init(&path
);
3486 fse
= get_fsdev_fsentry(s
->fsconf
.fsdev_id
);
3489 /* We don't have a fsdev identified by fsdev_id */
3490 error_setg(errp
, "9pfs device couldn't find fsdev with the "
3492 s
->fsconf
.fsdev_id
? s
->fsconf
.fsdev_id
: "NULL");
3496 if (!s
->fsconf
.tag
) {
3497 /* we haven't specified a mount_tag */
3498 error_setg(errp
, "fsdev with id %s needs mount_tag arguments",
3499 s
->fsconf
.fsdev_id
);
3503 s
->ctx
.export_flags
= fse
->export_flags
;
3504 s
->ctx
.fs_root
= g_strdup(fse
->path
);
3505 s
->ctx
.exops
.get_st_gen
= NULL
;
3506 len
= strlen(s
->fsconf
.tag
);
3507 if (len
> MAX_TAG_LEN
- 1) {
3508 error_setg(errp
, "mount tag '%s' (%d bytes) is longer than "
3509 "maximum (%d bytes)", s
->fsconf
.tag
, len
, MAX_TAG_LEN
- 1);
3513 s
->tag
= g_strdup(s
->fsconf
.tag
);
3519 qemu_co_rwlock_init(&s
->rename_lock
);
3521 if (s
->ops
->init(&s
->ctx
) < 0) {
3522 error_setg(errp
, "9pfs Failed to initialize fs-driver with id:%s"
3523 " and export path:%s", s
->fsconf
.fsdev_id
, s
->ctx
.fs_root
);
3528 * Check details of export path, We need to use fs driver
3529 * call back to do that. Since we are in the init path, we don't
3530 * use co-routines here.
3532 if (s
->ops
->name_to_path(&s
->ctx
, NULL
, "/", &path
) < 0) {
3534 "error in converting name to path %s", strerror(errno
));
3537 if (s
->ops
->lstat(&s
->ctx
, &path
, &stat
)) {
3538 error_setg(errp
, "share path %s does not exist", fse
->path
);
3540 } else if (!S_ISDIR(stat
.st_mode
)) {
3541 error_setg(errp
, "share path %s is not a directory", fse
->path
);
3545 s
->ctx
.fst
= &fse
->fst
;
3546 fsdev_throttle_init(s
->ctx
.fst
);
3548 v9fs_path_free(&path
);
3553 if (s
->ops
&& s
->ops
->cleanup
&& s
->ctx
.private) {
3554 s
->ops
->cleanup(&s
->ctx
);
3557 g_free(s
->ctx
.fs_root
);
3558 v9fs_path_free(&path
);
3563 void v9fs_device_unrealize_common(V9fsState
*s
, Error
**errp
)
3565 if (s
->ops
->cleanup
) {
3566 s
->ops
->cleanup(&s
->ctx
);
3568 fsdev_throttle_cleanup(s
->ctx
.fst
);
3570 g_free(s
->ctx
.fs_root
);
3573 typedef struct VirtfsCoResetData
{
3576 } VirtfsCoResetData
;
3578 static void coroutine_fn
virtfs_co_reset(void *opaque
)
3580 VirtfsCoResetData
*data
= opaque
;
3582 virtfs_reset(&data
->pdu
);
3586 void v9fs_reset(V9fsState
*s
)
3588 VirtfsCoResetData data
= { .pdu
= { .s
= s
}, .done
= false };
3591 while (!QLIST_EMPTY(&s
->active_list
)) {
3592 aio_poll(qemu_get_aio_context(), true);
3595 co
= qemu_coroutine_create(virtfs_co_reset
, &data
);
3596 qemu_coroutine_enter(co
);
3598 while (!data
.done
) {
3599 aio_poll(qemu_get_aio_context(), true);
3603 static void __attribute__((__constructor__
)) v9fs_set_fd_limit(void)
3606 if (getrlimit(RLIMIT_NOFILE
, &rlim
) < 0) {
3607 error_report("Failed to get the resource limit");
3610 open_fd_hw
= rlim
.rlim_cur
- MIN(400, rlim
.rlim_cur
/3);
3611 open_fd_rc
= rlim
.rlim_cur
/2;