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/main-loop.h"
21 #include "qemu/sockets.h"
22 #include "virtio-9p.h"
23 #include "fsdev/qemu-fsdev.h"
27 #include "migration/blocker.h"
28 #include "sysemu/qtest.h"
32 static int open_fd_rc
;
46 static ssize_t
pdu_marshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
52 ret
= pdu
->s
->transport
->pdu_vmarshal(pdu
, offset
, fmt
, ap
);
58 static ssize_t
pdu_unmarshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
64 ret
= pdu
->s
->transport
->pdu_vunmarshal(pdu
, offset
, fmt
, ap
);
70 static int omode_to_uflags(int8_t mode
)
104 typedef struct DotlOpenflagMap
{
109 static int dotl_to_open_flags(int flags
)
113 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
114 * and P9_DOTL_NOACCESS
116 int oflags
= flags
& O_ACCMODE
;
118 DotlOpenflagMap dotl_oflag_map
[] = {
119 { P9_DOTL_CREATE
, O_CREAT
},
120 { P9_DOTL_EXCL
, O_EXCL
},
121 { P9_DOTL_NOCTTY
, O_NOCTTY
},
122 { P9_DOTL_TRUNC
, O_TRUNC
},
123 { P9_DOTL_APPEND
, O_APPEND
},
124 { P9_DOTL_NONBLOCK
, O_NONBLOCK
} ,
125 { P9_DOTL_DSYNC
, O_DSYNC
},
126 { P9_DOTL_FASYNC
, FASYNC
},
127 { P9_DOTL_DIRECT
, O_DIRECT
},
128 { P9_DOTL_LARGEFILE
, O_LARGEFILE
},
129 { P9_DOTL_DIRECTORY
, O_DIRECTORY
},
130 { P9_DOTL_NOFOLLOW
, O_NOFOLLOW
},
131 { P9_DOTL_NOATIME
, O_NOATIME
},
132 { P9_DOTL_SYNC
, O_SYNC
},
135 for (i
= 0; i
< ARRAY_SIZE(dotl_oflag_map
); i
++) {
136 if (flags
& dotl_oflag_map
[i
].dotl_flag
) {
137 oflags
|= dotl_oflag_map
[i
].open_flag
;
144 void cred_init(FsCred
*credp
)
152 static int get_dotl_openflags(V9fsState
*s
, int oflags
)
156 * Filter the client open flags
158 flags
= dotl_to_open_flags(oflags
);
159 flags
&= ~(O_NOCTTY
| O_ASYNC
| O_CREAT
);
161 * Ignore direct disk access hint until the server supports it.
167 void v9fs_path_init(V9fsPath
*path
)
173 void v9fs_path_free(V9fsPath
*path
)
181 void GCC_FMT_ATTR(2, 3)
182 v9fs_path_sprintf(V9fsPath
*path
, const char *fmt
, ...)
186 v9fs_path_free(path
);
189 /* Bump the size for including terminating NULL */
190 path
->size
= g_vasprintf(&path
->data
, fmt
, ap
) + 1;
194 void v9fs_path_copy(V9fsPath
*dst
, const V9fsPath
*src
)
197 dst
->size
= src
->size
;
198 dst
->data
= g_memdup(src
->data
, src
->size
);
201 int v9fs_name_to_path(V9fsState
*s
, V9fsPath
*dirpath
,
202 const char *name
, V9fsPath
*path
)
205 err
= s
->ops
->name_to_path(&s
->ctx
, dirpath
, name
, path
);
213 * Return TRUE if s1 is an ancestor of s2.
215 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
216 * As a special case, We treat s1 as ancestor of s2 if they are same!
218 static int v9fs_path_is_ancestor(V9fsPath
*s1
, V9fsPath
*s2
)
220 if (!strncmp(s1
->data
, s2
->data
, s1
->size
- 1)) {
221 if (s2
->data
[s1
->size
- 1] == '\0' || s2
->data
[s1
->size
- 1] == '/') {
228 static size_t v9fs_string_size(V9fsString
*str
)
234 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
235 static int coroutine_fn
v9fs_reopen_fid(V9fsPDU
*pdu
, V9fsFidState
*f
)
238 if (f
->fid_type
== P9_FID_FILE
) {
239 if (f
->fs
.fd
== -1) {
241 err
= v9fs_co_open(pdu
, f
, f
->open_flags
);
242 } while (err
== -EINTR
&& !pdu
->cancelled
);
244 } else if (f
->fid_type
== P9_FID_DIR
) {
245 if (f
->fs
.dir
.stream
== NULL
) {
247 err
= v9fs_co_opendir(pdu
, f
);
248 } while (err
== -EINTR
&& !pdu
->cancelled
);
254 static V9fsFidState
*coroutine_fn
get_fid(V9fsPDU
*pdu
, int32_t fid
)
258 V9fsState
*s
= pdu
->s
;
260 for (f
= s
->fid_list
; f
; f
= f
->next
) {
264 * Update the fid ref upfront so that
265 * we don't get reclaimed when we yield
270 * check whether we need to reopen the
271 * file. We might have closed the fd
272 * while trying to free up some file
275 err
= v9fs_reopen_fid(pdu
, f
);
281 * Mark the fid as referenced so that the LRU
282 * reclaim won't close the file descriptor
284 f
->flags
|= FID_REFERENCED
;
291 static V9fsFidState
*alloc_fid(V9fsState
*s
, int32_t fid
)
295 for (f
= s
->fid_list
; f
; f
= f
->next
) {
296 /* If fid is already there return NULL */
302 f
= g_malloc0(sizeof(V9fsFidState
));
304 f
->fid_type
= P9_FID_NONE
;
307 * Mark the fid as referenced so that the LRU
308 * reclaim won't close the file descriptor
310 f
->flags
|= FID_REFERENCED
;
311 f
->next
= s
->fid_list
;
314 v9fs_readdir_init(&f
->fs
.dir
);
315 v9fs_readdir_init(&f
->fs_reclaim
.dir
);
320 static int coroutine_fn
v9fs_xattr_fid_clunk(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
324 if (fidp
->fs
.xattr
.xattrwalk_fid
) {
325 /* getxattr/listxattr fid */
329 * if this is fid for setxattr. clunk should
330 * result in setxattr localcall
332 if (fidp
->fs
.xattr
.len
!= fidp
->fs
.xattr
.copied_len
) {
333 /* clunk after partial write */
337 if (fidp
->fs
.xattr
.len
) {
338 retval
= v9fs_co_lsetxattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
,
339 fidp
->fs
.xattr
.value
,
341 fidp
->fs
.xattr
.flags
);
343 retval
= v9fs_co_lremovexattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
);
346 v9fs_string_free(&fidp
->fs
.xattr
.name
);
348 g_free(fidp
->fs
.xattr
.value
);
352 static int coroutine_fn
free_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
356 if (fidp
->fid_type
== P9_FID_FILE
) {
357 /* If we reclaimed the fd no need to close */
358 if (fidp
->fs
.fd
!= -1) {
359 retval
= v9fs_co_close(pdu
, &fidp
->fs
);
361 } else if (fidp
->fid_type
== P9_FID_DIR
) {
362 if (fidp
->fs
.dir
.stream
!= NULL
) {
363 retval
= v9fs_co_closedir(pdu
, &fidp
->fs
);
365 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
366 retval
= v9fs_xattr_fid_clunk(pdu
, fidp
);
368 v9fs_path_free(&fidp
->path
);
373 static int coroutine_fn
put_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
378 * Don't free the fid if it is in reclaim list
380 if (!fidp
->ref
&& fidp
->clunked
) {
381 if (fidp
->fid
== pdu
->s
->root_fid
) {
383 * if the clunked fid is root fid then we
384 * have unmounted the fs on the client side.
385 * delete the migration blocker. Ideally, this
386 * should be hooked to transport close notification
388 if (pdu
->s
->migration_blocker
) {
389 migrate_del_blocker(pdu
->s
->migration_blocker
);
390 error_free(pdu
->s
->migration_blocker
);
391 pdu
->s
->migration_blocker
= NULL
;
394 return free_fid(pdu
, fidp
);
399 static V9fsFidState
*clunk_fid(V9fsState
*s
, int32_t fid
)
401 V9fsFidState
**fidpp
, *fidp
;
403 for (fidpp
= &s
->fid_list
; *fidpp
; fidpp
= &(*fidpp
)->next
) {
404 if ((*fidpp
)->fid
== fid
) {
408 if (*fidpp
== NULL
) {
417 void coroutine_fn
v9fs_reclaim_fd(V9fsPDU
*pdu
)
419 int reclaim_count
= 0;
420 V9fsState
*s
= pdu
->s
;
421 V9fsFidState
*f
, *reclaim_list
= NULL
;
423 for (f
= s
->fid_list
; f
; f
= f
->next
) {
425 * Unlink fids cannot be reclaimed. Check
426 * for them and skip them. Also skip fids
427 * currently being operated on.
429 if (f
->ref
|| f
->flags
& FID_NON_RECLAIMABLE
) {
433 * if it is a recently referenced fid
434 * we leave the fid untouched and clear the
435 * reference bit. We come back to it later
436 * in the next iteration. (a simple LRU without
437 * moving list elements around)
439 if (f
->flags
& FID_REFERENCED
) {
440 f
->flags
&= ~FID_REFERENCED
;
444 * Add fids to reclaim list.
446 if (f
->fid_type
== P9_FID_FILE
) {
447 if (f
->fs
.fd
!= -1) {
449 * Up the reference count so that
450 * a clunk request won't free this fid
453 f
->rclm_lst
= reclaim_list
;
455 f
->fs_reclaim
.fd
= f
->fs
.fd
;
459 } else if (f
->fid_type
== P9_FID_DIR
) {
460 if (f
->fs
.dir
.stream
!= NULL
) {
462 * Up the reference count so that
463 * a clunk request won't free this fid
466 f
->rclm_lst
= reclaim_list
;
468 f
->fs_reclaim
.dir
.stream
= f
->fs
.dir
.stream
;
469 f
->fs
.dir
.stream
= NULL
;
473 if (reclaim_count
>= open_fd_rc
) {
478 * Now close the fid in reclaim list. Free them if they
479 * are already clunked.
481 while (reclaim_list
) {
483 reclaim_list
= f
->rclm_lst
;
484 if (f
->fid_type
== P9_FID_FILE
) {
485 v9fs_co_close(pdu
, &f
->fs_reclaim
);
486 } else if (f
->fid_type
== P9_FID_DIR
) {
487 v9fs_co_closedir(pdu
, &f
->fs_reclaim
);
491 * Now drop the fid reference, free it
498 static int coroutine_fn
v9fs_mark_fids_unreclaim(V9fsPDU
*pdu
, V9fsPath
*path
)
501 V9fsState
*s
= pdu
->s
;
502 V9fsFidState
*fidp
, head_fid
;
504 head_fid
.next
= s
->fid_list
;
505 for (fidp
= s
->fid_list
; fidp
; fidp
= fidp
->next
) {
506 if (fidp
->path
.size
!= path
->size
) {
509 if (!memcmp(fidp
->path
.data
, path
->data
, path
->size
)) {
510 /* Mark the fid non reclaimable. */
511 fidp
->flags
|= FID_NON_RECLAIMABLE
;
513 /* reopen the file/dir if already closed */
514 err
= v9fs_reopen_fid(pdu
, fidp
);
519 * Go back to head of fid list because
520 * the list could have got updated when
521 * switched to the worker thread
531 static void coroutine_fn
virtfs_reset(V9fsPDU
*pdu
)
533 V9fsState
*s
= pdu
->s
;
537 while (s
->fid_list
) {
543 s
->fid_list
= fidp
->next
;
550 #define P9_QID_TYPE_DIR 0x80
551 #define P9_QID_TYPE_SYMLINK 0x02
553 #define P9_STAT_MODE_DIR 0x80000000
554 #define P9_STAT_MODE_APPEND 0x40000000
555 #define P9_STAT_MODE_EXCL 0x20000000
556 #define P9_STAT_MODE_MOUNT 0x10000000
557 #define P9_STAT_MODE_AUTH 0x08000000
558 #define P9_STAT_MODE_TMP 0x04000000
559 #define P9_STAT_MODE_SYMLINK 0x02000000
560 #define P9_STAT_MODE_LINK 0x01000000
561 #define P9_STAT_MODE_DEVICE 0x00800000
562 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
563 #define P9_STAT_MODE_SOCKET 0x00100000
564 #define P9_STAT_MODE_SETUID 0x00080000
565 #define P9_STAT_MODE_SETGID 0x00040000
566 #define P9_STAT_MODE_SETVTX 0x00010000
568 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
569 P9_STAT_MODE_SYMLINK | \
570 P9_STAT_MODE_LINK | \
571 P9_STAT_MODE_DEVICE | \
572 P9_STAT_MODE_NAMED_PIPE | \
575 /* This is the algorithm from ufs in spfs */
576 static void stat_to_qid(const struct stat
*stbuf
, V9fsQID
*qidp
)
580 memset(&qidp
->path
, 0, sizeof(qidp
->path
));
581 size
= MIN(sizeof(stbuf
->st_ino
), sizeof(qidp
->path
));
582 memcpy(&qidp
->path
, &stbuf
->st_ino
, size
);
583 qidp
->version
= stbuf
->st_mtime
^ (stbuf
->st_size
<< 8);
585 if (S_ISDIR(stbuf
->st_mode
)) {
586 qidp
->type
|= P9_QID_TYPE_DIR
;
588 if (S_ISLNK(stbuf
->st_mode
)) {
589 qidp
->type
|= P9_QID_TYPE_SYMLINK
;
593 static int coroutine_fn
fid_to_qid(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
599 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
603 stat_to_qid(&stbuf
, qidp
);
607 V9fsPDU
*pdu_alloc(V9fsState
*s
)
611 if (!QLIST_EMPTY(&s
->free_list
)) {
612 pdu
= QLIST_FIRST(&s
->free_list
);
613 QLIST_REMOVE(pdu
, next
);
614 QLIST_INSERT_HEAD(&s
->active_list
, pdu
, next
);
619 void pdu_free(V9fsPDU
*pdu
)
621 V9fsState
*s
= pdu
->s
;
623 g_assert(!pdu
->cancelled
);
624 QLIST_REMOVE(pdu
, next
);
625 QLIST_INSERT_HEAD(&s
->free_list
, pdu
, next
);
628 static void coroutine_fn
pdu_complete(V9fsPDU
*pdu
, ssize_t len
)
630 int8_t id
= pdu
->id
+ 1; /* Response */
631 V9fsState
*s
= pdu
->s
;
635 * The 9p spec requires that successfully cancelled pdus receive no reply.
636 * Sending a reply would confuse clients because they would
637 * assume that any EINTR is the actual result of the operation,
638 * rather than a consequence of the cancellation. However, if
639 * the operation completed (succesfully or with an error other
640 * than caused be cancellation), we do send out that reply, both
641 * for efficiency and to avoid confusing the rest of the state machine
642 * that assumes passing a non-error here will mean a successful
643 * transmission of the reply.
645 bool discard
= pdu
->cancelled
&& len
== -EINTR
;
647 trace_v9fs_rcancel(pdu
->tag
, pdu
->id
);
656 if (s
->proto_version
!= V9FS_PROTO_2000L
) {
659 str
.data
= strerror(err
);
660 str
.size
= strlen(str
.data
);
662 ret
= pdu_marshal(pdu
, len
, "s", &str
);
670 ret
= pdu_marshal(pdu
, len
, "d", err
);
676 if (s
->proto_version
== V9FS_PROTO_2000L
) {
679 trace_v9fs_rerror(pdu
->tag
, pdu
->id
, err
); /* Trace ERROR */
682 /* fill out the header */
683 if (pdu_marshal(pdu
, 0, "dbw", (int32_t)len
, id
, pdu
->tag
) < 0) {
687 /* keep these in sync */
692 pdu
->s
->transport
->push_and_notify(pdu
);
694 /* Now wakeup anybody waiting in flush for this request */
695 if (!qemu_co_queue_next(&pdu
->complete
)) {
700 static mode_t
v9mode_to_mode(uint32_t mode
, V9fsString
*extension
)
705 if (mode
& P9_STAT_MODE_DIR
) {
709 if (mode
& P9_STAT_MODE_SYMLINK
) {
712 if (mode
& P9_STAT_MODE_SOCKET
) {
715 if (mode
& P9_STAT_MODE_NAMED_PIPE
) {
718 if (mode
& P9_STAT_MODE_DEVICE
) {
719 if (extension
->size
&& extension
->data
[0] == 'c') {
730 if (mode
& P9_STAT_MODE_SETUID
) {
733 if (mode
& P9_STAT_MODE_SETGID
) {
736 if (mode
& P9_STAT_MODE_SETVTX
) {
743 static int donttouch_stat(V9fsStat
*stat
)
745 if (stat
->type
== -1 &&
747 stat
->qid
.type
== -1 &&
748 stat
->qid
.version
== -1 &&
749 stat
->qid
.path
== -1 &&
753 stat
->length
== -1 &&
760 stat
->n_muid
== -1) {
767 static void v9fs_stat_init(V9fsStat
*stat
)
769 v9fs_string_init(&stat
->name
);
770 v9fs_string_init(&stat
->uid
);
771 v9fs_string_init(&stat
->gid
);
772 v9fs_string_init(&stat
->muid
);
773 v9fs_string_init(&stat
->extension
);
776 static void v9fs_stat_free(V9fsStat
*stat
)
778 v9fs_string_free(&stat
->name
);
779 v9fs_string_free(&stat
->uid
);
780 v9fs_string_free(&stat
->gid
);
781 v9fs_string_free(&stat
->muid
);
782 v9fs_string_free(&stat
->extension
);
785 static uint32_t stat_to_v9mode(const struct stat
*stbuf
)
789 mode
= stbuf
->st_mode
& 0777;
790 if (S_ISDIR(stbuf
->st_mode
)) {
791 mode
|= P9_STAT_MODE_DIR
;
794 if (S_ISLNK(stbuf
->st_mode
)) {
795 mode
|= P9_STAT_MODE_SYMLINK
;
798 if (S_ISSOCK(stbuf
->st_mode
)) {
799 mode
|= P9_STAT_MODE_SOCKET
;
802 if (S_ISFIFO(stbuf
->st_mode
)) {
803 mode
|= P9_STAT_MODE_NAMED_PIPE
;
806 if (S_ISBLK(stbuf
->st_mode
) || S_ISCHR(stbuf
->st_mode
)) {
807 mode
|= P9_STAT_MODE_DEVICE
;
810 if (stbuf
->st_mode
& S_ISUID
) {
811 mode
|= P9_STAT_MODE_SETUID
;
814 if (stbuf
->st_mode
& S_ISGID
) {
815 mode
|= P9_STAT_MODE_SETGID
;
818 if (stbuf
->st_mode
& S_ISVTX
) {
819 mode
|= P9_STAT_MODE_SETVTX
;
825 static int coroutine_fn
stat_to_v9stat(V9fsPDU
*pdu
, V9fsPath
*path
,
826 const char *basename
,
827 const struct stat
*stbuf
,
832 memset(v9stat
, 0, sizeof(*v9stat
));
834 stat_to_qid(stbuf
, &v9stat
->qid
);
835 v9stat
->mode
= stat_to_v9mode(stbuf
);
836 v9stat
->atime
= stbuf
->st_atime
;
837 v9stat
->mtime
= stbuf
->st_mtime
;
838 v9stat
->length
= stbuf
->st_size
;
840 v9fs_string_free(&v9stat
->uid
);
841 v9fs_string_free(&v9stat
->gid
);
842 v9fs_string_free(&v9stat
->muid
);
844 v9stat
->n_uid
= stbuf
->st_uid
;
845 v9stat
->n_gid
= stbuf
->st_gid
;
848 v9fs_string_free(&v9stat
->extension
);
850 if (v9stat
->mode
& P9_STAT_MODE_SYMLINK
) {
851 err
= v9fs_co_readlink(pdu
, path
, &v9stat
->extension
);
855 } else if (v9stat
->mode
& P9_STAT_MODE_DEVICE
) {
856 v9fs_string_sprintf(&v9stat
->extension
, "%c %u %u",
857 S_ISCHR(stbuf
->st_mode
) ? 'c' : 'b',
858 major(stbuf
->st_rdev
), minor(stbuf
->st_rdev
));
859 } else if (S_ISDIR(stbuf
->st_mode
) || S_ISREG(stbuf
->st_mode
)) {
860 v9fs_string_sprintf(&v9stat
->extension
, "%s %lu",
861 "HARDLINKCOUNT", (unsigned long)stbuf
->st_nlink
);
864 v9fs_string_sprintf(&v9stat
->name
, "%s", basename
);
867 v9fs_string_size(&v9stat
->name
) +
868 v9fs_string_size(&v9stat
->uid
) +
869 v9fs_string_size(&v9stat
->gid
) +
870 v9fs_string_size(&v9stat
->muid
) +
871 v9fs_string_size(&v9stat
->extension
);
875 #define P9_STATS_MODE 0x00000001ULL
876 #define P9_STATS_NLINK 0x00000002ULL
877 #define P9_STATS_UID 0x00000004ULL
878 #define P9_STATS_GID 0x00000008ULL
879 #define P9_STATS_RDEV 0x00000010ULL
880 #define P9_STATS_ATIME 0x00000020ULL
881 #define P9_STATS_MTIME 0x00000040ULL
882 #define P9_STATS_CTIME 0x00000080ULL
883 #define P9_STATS_INO 0x00000100ULL
884 #define P9_STATS_SIZE 0x00000200ULL
885 #define P9_STATS_BLOCKS 0x00000400ULL
887 #define P9_STATS_BTIME 0x00000800ULL
888 #define P9_STATS_GEN 0x00001000ULL
889 #define P9_STATS_DATA_VERSION 0x00002000ULL
891 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
892 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
895 static void stat_to_v9stat_dotl(V9fsState
*s
, const struct stat
*stbuf
,
896 V9fsStatDotl
*v9lstat
)
898 memset(v9lstat
, 0, sizeof(*v9lstat
));
900 v9lstat
->st_mode
= stbuf
->st_mode
;
901 v9lstat
->st_nlink
= stbuf
->st_nlink
;
902 v9lstat
->st_uid
= stbuf
->st_uid
;
903 v9lstat
->st_gid
= stbuf
->st_gid
;
904 v9lstat
->st_rdev
= stbuf
->st_rdev
;
905 v9lstat
->st_size
= stbuf
->st_size
;
906 v9lstat
->st_blksize
= stbuf
->st_blksize
;
907 v9lstat
->st_blocks
= stbuf
->st_blocks
;
908 v9lstat
->st_atime_sec
= stbuf
->st_atime
;
909 v9lstat
->st_atime_nsec
= stbuf
->st_atim
.tv_nsec
;
910 v9lstat
->st_mtime_sec
= stbuf
->st_mtime
;
911 v9lstat
->st_mtime_nsec
= stbuf
->st_mtim
.tv_nsec
;
912 v9lstat
->st_ctime_sec
= stbuf
->st_ctime
;
913 v9lstat
->st_ctime_nsec
= stbuf
->st_ctim
.tv_nsec
;
914 /* Currently we only support BASIC fields in stat */
915 v9lstat
->st_result_mask
= P9_STATS_BASIC
;
917 stat_to_qid(stbuf
, &v9lstat
->qid
);
920 static void print_sg(struct iovec
*sg
, int cnt
)
924 printf("sg[%d]: {", cnt
);
925 for (i
= 0; i
< cnt
; i
++) {
929 printf("(%p, %zd)", sg
[i
].iov_base
, sg
[i
].iov_len
);
934 /* Will call this only for path name based fid */
935 static void v9fs_fix_path(V9fsPath
*dst
, V9fsPath
*src
, int len
)
938 v9fs_path_init(&str
);
939 v9fs_path_copy(&str
, dst
);
940 v9fs_path_sprintf(dst
, "%s%s", src
->data
, str
.data
+ len
);
941 v9fs_path_free(&str
);
944 static inline bool is_ro_export(FsContext
*ctx
)
946 return ctx
->export_flags
& V9FS_RDONLY
;
949 static void coroutine_fn
v9fs_version(void *opaque
)
952 V9fsPDU
*pdu
= opaque
;
953 V9fsState
*s
= pdu
->s
;
957 v9fs_string_init(&version
);
958 err
= pdu_unmarshal(pdu
, offset
, "ds", &s
->msize
, &version
);
962 trace_v9fs_version(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
966 if (!strcmp(version
.data
, "9P2000.u")) {
967 s
->proto_version
= V9FS_PROTO_2000U
;
968 } else if (!strcmp(version
.data
, "9P2000.L")) {
969 s
->proto_version
= V9FS_PROTO_2000L
;
971 v9fs_string_sprintf(&version
, "unknown");
974 err
= pdu_marshal(pdu
, offset
, "ds", s
->msize
, &version
);
979 trace_v9fs_version_return(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
981 pdu_complete(pdu
, err
);
982 v9fs_string_free(&version
);
985 static void coroutine_fn
v9fs_attach(void *opaque
)
987 V9fsPDU
*pdu
= opaque
;
988 V9fsState
*s
= pdu
->s
;
989 int32_t fid
, afid
, n_uname
;
990 V9fsString uname
, aname
;
995 Error
*local_err
= NULL
;
997 v9fs_string_init(&uname
);
998 v9fs_string_init(&aname
);
999 err
= pdu_unmarshal(pdu
, offset
, "ddssd", &fid
,
1000 &afid
, &uname
, &aname
, &n_uname
);
1004 trace_v9fs_attach(pdu
->tag
, pdu
->id
, fid
, afid
, uname
.data
, aname
.data
);
1006 fidp
= alloc_fid(s
, fid
);
1011 fidp
->uid
= n_uname
;
1012 err
= v9fs_co_name_to_path(pdu
, NULL
, "/", &fidp
->path
);
1018 err
= fid_to_qid(pdu
, fidp
, &qid
);
1026 * disable migration if we haven't done already.
1027 * attach could get called multiple times for the same export.
1029 if (!s
->migration_blocker
) {
1030 error_setg(&s
->migration_blocker
,
1031 "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
1032 s
->ctx
.fs_root
? s
->ctx
.fs_root
: "NULL", s
->tag
);
1033 err
= migrate_add_blocker(s
->migration_blocker
, &local_err
);
1035 error_free(local_err
);
1036 error_free(s
->migration_blocker
);
1037 s
->migration_blocker
= NULL
;
1044 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
1051 memcpy(&s
->root_qid
, &qid
, sizeof(qid
));
1052 trace_v9fs_attach_return(pdu
->tag
, pdu
->id
,
1053 qid
.type
, qid
.version
, qid
.path
);
1057 pdu_complete(pdu
, err
);
1058 v9fs_string_free(&uname
);
1059 v9fs_string_free(&aname
);
1062 static void coroutine_fn
v9fs_stat(void *opaque
)
1070 V9fsPDU
*pdu
= opaque
;
1073 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
1077 trace_v9fs_stat(pdu
->tag
, pdu
->id
, fid
);
1079 fidp
= get_fid(pdu
, fid
);
1084 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1088 basename
= g_path_get_basename(fidp
->path
.data
);
1089 err
= stat_to_v9stat(pdu
, &fidp
->path
, basename
, &stbuf
, &v9stat
);
1094 err
= pdu_marshal(pdu
, offset
, "wS", 0, &v9stat
);
1096 v9fs_stat_free(&v9stat
);
1099 trace_v9fs_stat_return(pdu
->tag
, pdu
->id
, v9stat
.mode
,
1100 v9stat
.atime
, v9stat
.mtime
, v9stat
.length
);
1102 v9fs_stat_free(&v9stat
);
1106 pdu_complete(pdu
, err
);
1109 static void coroutine_fn
v9fs_getattr(void *opaque
)
1116 uint64_t request_mask
;
1117 V9fsStatDotl v9stat_dotl
;
1118 V9fsPDU
*pdu
= opaque
;
1119 V9fsState
*s
= pdu
->s
;
1121 retval
= pdu_unmarshal(pdu
, offset
, "dq", &fid
, &request_mask
);
1125 trace_v9fs_getattr(pdu
->tag
, pdu
->id
, fid
, request_mask
);
1127 fidp
= get_fid(pdu
, fid
);
1133 * Currently we only support BASIC fields in stat, so there is no
1134 * need to look at request_mask.
1136 retval
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1140 stat_to_v9stat_dotl(s
, &stbuf
, &v9stat_dotl
);
1142 /* fill st_gen if requested and supported by underlying fs */
1143 if (request_mask
& P9_STATS_GEN
) {
1144 retval
= v9fs_co_st_gen(pdu
, &fidp
->path
, stbuf
.st_mode
, &v9stat_dotl
);
1147 /* we have valid st_gen: update result mask */
1148 v9stat_dotl
.st_result_mask
|= P9_STATS_GEN
;
1151 /* request cancelled, e.g. by Tflush */
1154 /* failed to get st_gen: not fatal, ignore */
1158 retval
= pdu_marshal(pdu
, offset
, "A", &v9stat_dotl
);
1163 trace_v9fs_getattr_return(pdu
->tag
, pdu
->id
, v9stat_dotl
.st_result_mask
,
1164 v9stat_dotl
.st_mode
, v9stat_dotl
.st_uid
,
1165 v9stat_dotl
.st_gid
);
1169 pdu_complete(pdu
, retval
);
1172 /* Attribute flags */
1173 #define P9_ATTR_MODE (1 << 0)
1174 #define P9_ATTR_UID (1 << 1)
1175 #define P9_ATTR_GID (1 << 2)
1176 #define P9_ATTR_SIZE (1 << 3)
1177 #define P9_ATTR_ATIME (1 << 4)
1178 #define P9_ATTR_MTIME (1 << 5)
1179 #define P9_ATTR_CTIME (1 << 6)
1180 #define P9_ATTR_ATIME_SET (1 << 7)
1181 #define P9_ATTR_MTIME_SET (1 << 8)
1183 #define P9_ATTR_MASK 127
1185 static void coroutine_fn
v9fs_setattr(void *opaque
)
1192 V9fsPDU
*pdu
= opaque
;
1194 err
= pdu_unmarshal(pdu
, offset
, "dI", &fid
, &v9iattr
);
1199 trace_v9fs_setattr(pdu
->tag
, pdu
->id
, fid
,
1200 v9iattr
.valid
, v9iattr
.mode
, v9iattr
.uid
, v9iattr
.gid
,
1201 v9iattr
.size
, v9iattr
.atime_sec
, v9iattr
.mtime_sec
);
1203 fidp
= get_fid(pdu
, fid
);
1208 if (v9iattr
.valid
& P9_ATTR_MODE
) {
1209 err
= v9fs_co_chmod(pdu
, &fidp
->path
, v9iattr
.mode
);
1214 if (v9iattr
.valid
& (P9_ATTR_ATIME
| P9_ATTR_MTIME
)) {
1215 struct timespec times
[2];
1216 if (v9iattr
.valid
& P9_ATTR_ATIME
) {
1217 if (v9iattr
.valid
& P9_ATTR_ATIME_SET
) {
1218 times
[0].tv_sec
= v9iattr
.atime_sec
;
1219 times
[0].tv_nsec
= v9iattr
.atime_nsec
;
1221 times
[0].tv_nsec
= UTIME_NOW
;
1224 times
[0].tv_nsec
= UTIME_OMIT
;
1226 if (v9iattr
.valid
& P9_ATTR_MTIME
) {
1227 if (v9iattr
.valid
& P9_ATTR_MTIME_SET
) {
1228 times
[1].tv_sec
= v9iattr
.mtime_sec
;
1229 times
[1].tv_nsec
= v9iattr
.mtime_nsec
;
1231 times
[1].tv_nsec
= UTIME_NOW
;
1234 times
[1].tv_nsec
= UTIME_OMIT
;
1236 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
1242 * If the only valid entry in iattr is ctime we can call
1243 * chown(-1,-1) to update the ctime of the file
1245 if ((v9iattr
.valid
& (P9_ATTR_UID
| P9_ATTR_GID
)) ||
1246 ((v9iattr
.valid
& P9_ATTR_CTIME
)
1247 && !((v9iattr
.valid
& P9_ATTR_MASK
) & ~P9_ATTR_CTIME
))) {
1248 if (!(v9iattr
.valid
& P9_ATTR_UID
)) {
1251 if (!(v9iattr
.valid
& P9_ATTR_GID
)) {
1254 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9iattr
.uid
,
1260 if (v9iattr
.valid
& (P9_ATTR_SIZE
)) {
1261 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9iattr
.size
);
1267 trace_v9fs_setattr_return(pdu
->tag
, pdu
->id
);
1271 pdu_complete(pdu
, err
);
1274 static int v9fs_walk_marshal(V9fsPDU
*pdu
, uint16_t nwnames
, V9fsQID
*qids
)
1280 err
= pdu_marshal(pdu
, offset
, "w", nwnames
);
1285 for (i
= 0; i
< nwnames
; i
++) {
1286 err
= pdu_marshal(pdu
, offset
, "Q", &qids
[i
]);
1295 static bool name_is_illegal(const char *name
)
1297 return !*name
|| strchr(name
, '/') != NULL
;
1300 static bool not_same_qid(const V9fsQID
*qid1
, const V9fsQID
*qid2
)
1303 qid1
->type
!= qid2
->type
||
1304 qid1
->version
!= qid2
->version
||
1305 qid1
->path
!= qid2
->path
;
1308 static void coroutine_fn
v9fs_walk(void *opaque
)
1311 V9fsQID
*qids
= NULL
;
1313 V9fsPath dpath
, path
;
1317 int32_t fid
, newfid
;
1318 V9fsString
*wnames
= NULL
;
1320 V9fsFidState
*newfidp
= NULL
;
1321 V9fsPDU
*pdu
= opaque
;
1322 V9fsState
*s
= pdu
->s
;
1325 err
= pdu_unmarshal(pdu
, offset
, "ddw", &fid
, &newfid
, &nwnames
);
1327 pdu_complete(pdu
, err
);
1332 trace_v9fs_walk(pdu
->tag
, pdu
->id
, fid
, newfid
, nwnames
);
1334 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1335 wnames
= g_new0(V9fsString
, nwnames
);
1336 qids
= g_new0(V9fsQID
, nwnames
);
1337 for (i
= 0; i
< nwnames
; i
++) {
1338 err
= pdu_unmarshal(pdu
, offset
, "s", &wnames
[i
]);
1342 if (name_is_illegal(wnames
[i
].data
)) {
1348 } else if (nwnames
> P9_MAXWELEM
) {
1352 fidp
= get_fid(pdu
, fid
);
1358 v9fs_path_init(&dpath
);
1359 v9fs_path_init(&path
);
1361 err
= fid_to_qid(pdu
, fidp
, &qid
);
1367 * Both dpath and path initially poin to fidp.
1368 * Needed to handle request with nwnames == 0
1370 v9fs_path_copy(&dpath
, &fidp
->path
);
1371 v9fs_path_copy(&path
, &fidp
->path
);
1372 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1373 if (not_same_qid(&pdu
->s
->root_qid
, &qid
) ||
1374 strcmp("..", wnames
[name_idx
].data
)) {
1375 err
= v9fs_co_name_to_path(pdu
, &dpath
, wnames
[name_idx
].data
,
1381 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1385 stat_to_qid(&stbuf
, &qid
);
1386 v9fs_path_copy(&dpath
, &path
);
1388 memcpy(&qids
[name_idx
], &qid
, sizeof(qid
));
1390 if (fid
== newfid
) {
1391 if (fidp
->fid_type
!= P9_FID_NONE
) {
1395 v9fs_path_write_lock(s
);
1396 v9fs_path_copy(&fidp
->path
, &path
);
1397 v9fs_path_unlock(s
);
1399 newfidp
= alloc_fid(s
, newfid
);
1400 if (newfidp
== NULL
) {
1404 newfidp
->uid
= fidp
->uid
;
1405 v9fs_path_copy(&newfidp
->path
, &path
);
1407 err
= v9fs_walk_marshal(pdu
, nwnames
, qids
);
1408 trace_v9fs_walk_return(pdu
->tag
, pdu
->id
, nwnames
, qids
);
1412 put_fid(pdu
, newfidp
);
1414 v9fs_path_free(&dpath
);
1415 v9fs_path_free(&path
);
1417 pdu_complete(pdu
, err
);
1418 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1419 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1420 v9fs_string_free(&wnames
[name_idx
]);
1427 static int32_t coroutine_fn
get_iounit(V9fsPDU
*pdu
, V9fsPath
*path
)
1429 struct statfs stbuf
;
1431 V9fsState
*s
= pdu
->s
;
1434 * iounit should be multiples of f_bsize (host filesystem block size
1435 * and as well as less than (client msize - P9_IOHDRSZ))
1437 if (!v9fs_co_statfs(pdu
, path
, &stbuf
)) {
1438 iounit
= stbuf
.f_bsize
;
1439 iounit
*= (s
->msize
- P9_IOHDRSZ
)/stbuf
.f_bsize
;
1442 iounit
= s
->msize
- P9_IOHDRSZ
;
1447 static void coroutine_fn
v9fs_open(void *opaque
)
1458 V9fsPDU
*pdu
= opaque
;
1459 V9fsState
*s
= pdu
->s
;
1461 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1462 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &mode
);
1465 err
= pdu_unmarshal(pdu
, offset
, "db", &fid
, &modebyte
);
1471 trace_v9fs_open(pdu
->tag
, pdu
->id
, fid
, mode
);
1473 fidp
= get_fid(pdu
, fid
);
1478 if (fidp
->fid_type
!= P9_FID_NONE
) {
1483 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1487 stat_to_qid(&stbuf
, &qid
);
1488 if (S_ISDIR(stbuf
.st_mode
)) {
1489 err
= v9fs_co_opendir(pdu
, fidp
);
1493 fidp
->fid_type
= P9_FID_DIR
;
1494 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, 0);
1500 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1501 flags
= get_dotl_openflags(s
, mode
);
1503 flags
= omode_to_uflags(mode
);
1505 if (is_ro_export(&s
->ctx
)) {
1506 if (mode
& O_WRONLY
|| mode
& O_RDWR
||
1507 mode
& O_APPEND
|| mode
& O_TRUNC
) {
1512 err
= v9fs_co_open(pdu
, fidp
, flags
);
1516 fidp
->fid_type
= P9_FID_FILE
;
1517 fidp
->open_flags
= flags
;
1518 if (flags
& O_EXCL
) {
1520 * We let the host file system do O_EXCL check
1521 * We should not reclaim such fd
1523 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1525 iounit
= get_iounit(pdu
, &fidp
->path
);
1526 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1532 trace_v9fs_open_return(pdu
->tag
, pdu
->id
,
1533 qid
.type
, qid
.version
, qid
.path
, iounit
);
1537 pdu_complete(pdu
, err
);
1540 static void coroutine_fn
v9fs_lcreate(void *opaque
)
1542 int32_t dfid
, flags
, mode
;
1551 V9fsPDU
*pdu
= opaque
;
1553 v9fs_string_init(&name
);
1554 err
= pdu_unmarshal(pdu
, offset
, "dsddd", &dfid
,
1555 &name
, &flags
, &mode
, &gid
);
1559 trace_v9fs_lcreate(pdu
->tag
, pdu
->id
, dfid
, flags
, mode
, gid
);
1561 if (name_is_illegal(name
.data
)) {
1566 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
1571 fidp
= get_fid(pdu
, dfid
);
1576 if (fidp
->fid_type
!= P9_FID_NONE
) {
1581 flags
= get_dotl_openflags(pdu
->s
, flags
);
1582 err
= v9fs_co_open2(pdu
, fidp
, &name
, gid
,
1583 flags
| O_CREAT
, mode
, &stbuf
);
1587 fidp
->fid_type
= P9_FID_FILE
;
1588 fidp
->open_flags
= flags
;
1589 if (flags
& O_EXCL
) {
1591 * We let the host file system do O_EXCL check
1592 * We should not reclaim such fd
1594 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1596 iounit
= get_iounit(pdu
, &fidp
->path
);
1597 stat_to_qid(&stbuf
, &qid
);
1598 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1603 trace_v9fs_lcreate_return(pdu
->tag
, pdu
->id
,
1604 qid
.type
, qid
.version
, qid
.path
, iounit
);
1608 pdu_complete(pdu
, err
);
1609 v9fs_string_free(&name
);
1612 static void coroutine_fn
v9fs_fsync(void *opaque
)
1619 V9fsPDU
*pdu
= opaque
;
1621 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &datasync
);
1625 trace_v9fs_fsync(pdu
->tag
, pdu
->id
, fid
, datasync
);
1627 fidp
= get_fid(pdu
, fid
);
1632 err
= v9fs_co_fsync(pdu
, fidp
, datasync
);
1638 pdu_complete(pdu
, err
);
1641 static void coroutine_fn
v9fs_clunk(void *opaque
)
1647 V9fsPDU
*pdu
= opaque
;
1648 V9fsState
*s
= pdu
->s
;
1650 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
1654 trace_v9fs_clunk(pdu
->tag
, pdu
->id
, fid
);
1656 fidp
= clunk_fid(s
, fid
);
1662 * Bump the ref so that put_fid will
1666 err
= put_fid(pdu
, fidp
);
1671 pdu_complete(pdu
, err
);
1675 * Create a QEMUIOVector for a sub-region of PDU iovecs
1677 * @qiov: uninitialized QEMUIOVector
1678 * @skip: number of bytes to skip from beginning of PDU
1679 * @size: number of bytes to include
1680 * @is_write: true - write, false - read
1682 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
1683 * with qemu_iovec_destroy().
1685 static void v9fs_init_qiov_from_pdu(QEMUIOVector
*qiov
, V9fsPDU
*pdu
,
1686 size_t skip
, size_t size
,
1694 pdu
->s
->transport
->init_out_iov_from_pdu(pdu
, &iov
, &niov
, size
+ skip
);
1696 pdu
->s
->transport
->init_in_iov_from_pdu(pdu
, &iov
, &niov
, size
+ skip
);
1699 qemu_iovec_init_external(&elem
, iov
, niov
);
1700 qemu_iovec_init(qiov
, niov
);
1701 qemu_iovec_concat(qiov
, &elem
, skip
, size
);
1704 static int v9fs_xattr_read(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1705 uint64_t off
, uint32_t max_count
)
1709 uint64_t read_count
;
1710 QEMUIOVector qiov_full
;
1712 if (fidp
->fs
.xattr
.len
< off
) {
1715 read_count
= fidp
->fs
.xattr
.len
- off
;
1717 if (read_count
> max_count
) {
1718 read_count
= max_count
;
1720 err
= pdu_marshal(pdu
, offset
, "d", read_count
);
1726 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, read_count
, false);
1727 err
= v9fs_pack(qiov_full
.iov
, qiov_full
.niov
, 0,
1728 ((char *)fidp
->fs
.xattr
.value
) + off
,
1730 qemu_iovec_destroy(&qiov_full
);
1738 static int coroutine_fn
v9fs_do_readdir_with_stat(V9fsPDU
*pdu
,
1747 off_t saved_dir_pos
;
1748 struct dirent
*dent
;
1750 /* save the directory position */
1751 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1752 if (saved_dir_pos
< 0) {
1753 return saved_dir_pos
;
1757 v9fs_path_init(&path
);
1759 v9fs_readdir_lock(&fidp
->fs
.dir
);
1761 err
= v9fs_co_readdir(pdu
, fidp
, &dent
);
1765 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, dent
->d_name
, &path
);
1769 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1773 err
= stat_to_v9stat(pdu
, &path
, dent
->d_name
, &stbuf
, &v9stat
);
1777 if ((count
+ v9stat
.size
+ 2) > max_count
) {
1778 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1780 /* Ran out of buffer. Set dir back to old position and return */
1781 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1782 v9fs_stat_free(&v9stat
);
1783 v9fs_path_free(&path
);
1787 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1788 len
= pdu_marshal(pdu
, 11 + count
, "S", &v9stat
);
1790 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1793 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1794 v9fs_stat_free(&v9stat
);
1795 v9fs_path_free(&path
);
1799 v9fs_stat_free(&v9stat
);
1800 v9fs_path_free(&path
);
1801 saved_dir_pos
= dent
->d_off
;
1804 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1806 v9fs_path_free(&path
);
1813 static void coroutine_fn
v9fs_read(void *opaque
)
1822 V9fsPDU
*pdu
= opaque
;
1823 V9fsState
*s
= pdu
->s
;
1825 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &max_count
);
1829 trace_v9fs_read(pdu
->tag
, pdu
->id
, fid
, off
, max_count
);
1831 fidp
= get_fid(pdu
, fid
);
1836 if (fidp
->fid_type
== P9_FID_DIR
) {
1839 v9fs_co_rewinddir(pdu
, fidp
);
1841 count
= v9fs_do_readdir_with_stat(pdu
, fidp
, max_count
);
1846 err
= pdu_marshal(pdu
, offset
, "d", count
);
1850 err
+= offset
+ count
;
1851 } else if (fidp
->fid_type
== P9_FID_FILE
) {
1852 QEMUIOVector qiov_full
;
1856 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
+ 4, max_count
, false);
1857 qemu_iovec_init(&qiov
, qiov_full
.niov
);
1859 qemu_iovec_reset(&qiov
);
1860 qemu_iovec_concat(&qiov
, &qiov_full
, count
, qiov_full
.size
- count
);
1862 print_sg(qiov
.iov
, qiov
.niov
);
1864 /* Loop in case of EINTR */
1866 len
= v9fs_co_preadv(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
1871 } while (len
== -EINTR
&& !pdu
->cancelled
);
1873 /* IO error return the error */
1875 goto out_free_iovec
;
1877 } while (count
< max_count
&& len
> 0);
1878 err
= pdu_marshal(pdu
, offset
, "d", count
);
1880 goto out_free_iovec
;
1882 err
+= offset
+ count
;
1884 qemu_iovec_destroy(&qiov
);
1885 qemu_iovec_destroy(&qiov_full
);
1886 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
1887 err
= v9fs_xattr_read(s
, pdu
, fidp
, off
, max_count
);
1891 trace_v9fs_read_return(pdu
->tag
, pdu
->id
, count
, err
);
1895 pdu_complete(pdu
, err
);
1898 static size_t v9fs_readdir_data_size(V9fsString
*name
)
1901 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1902 * size of type (1) + size of name.size (2) + strlen(name.data)
1904 return 24 + v9fs_string_size(name
);
1907 static int coroutine_fn
v9fs_do_readdir(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1915 off_t saved_dir_pos
;
1916 struct dirent
*dent
;
1918 /* save the directory position */
1919 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1920 if (saved_dir_pos
< 0) {
1921 return saved_dir_pos
;
1925 v9fs_readdir_lock(&fidp
->fs
.dir
);
1927 err
= v9fs_co_readdir(pdu
, fidp
, &dent
);
1931 v9fs_string_init(&name
);
1932 v9fs_string_sprintf(&name
, "%s", dent
->d_name
);
1933 if ((count
+ v9fs_readdir_data_size(&name
)) > max_count
) {
1934 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1936 /* Ran out of buffer. Set dir back to old position and return */
1937 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1938 v9fs_string_free(&name
);
1942 * Fill up just the path field of qid because the client uses
1943 * only that. To fill the entire qid structure we will have
1944 * to stat each dirent found, which is expensive
1946 size
= MIN(sizeof(dent
->d_ino
), sizeof(qid
.path
));
1947 memcpy(&qid
.path
, &dent
->d_ino
, size
);
1948 /* Fill the other fields with dummy values */
1952 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1953 len
= pdu_marshal(pdu
, 11 + count
, "Qqbs",
1955 dent
->d_type
, &name
);
1957 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1960 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1961 v9fs_string_free(&name
);
1965 v9fs_string_free(&name
);
1966 saved_dir_pos
= dent
->d_off
;
1969 v9fs_readdir_unlock(&fidp
->fs
.dir
);
1977 static void coroutine_fn
v9fs_readdir(void *opaque
)
1983 uint64_t initial_offset
;
1986 V9fsPDU
*pdu
= opaque
;
1988 retval
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
,
1989 &initial_offset
, &max_count
);
1993 trace_v9fs_readdir(pdu
->tag
, pdu
->id
, fid
, initial_offset
, max_count
);
1995 fidp
= get_fid(pdu
, fid
);
2000 if (!fidp
->fs
.dir
.stream
) {
2004 if (initial_offset
== 0) {
2005 v9fs_co_rewinddir(pdu
, fidp
);
2007 v9fs_co_seekdir(pdu
, fidp
, initial_offset
);
2009 count
= v9fs_do_readdir(pdu
, fidp
, max_count
);
2014 retval
= pdu_marshal(pdu
, offset
, "d", count
);
2018 retval
+= count
+ offset
;
2019 trace_v9fs_readdir_return(pdu
->tag
, pdu
->id
, count
, retval
);
2023 pdu_complete(pdu
, retval
);
2026 static int v9fs_xattr_write(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2027 uint64_t off
, uint32_t count
,
2028 struct iovec
*sg
, int cnt
)
2032 uint64_t write_count
;
2036 if (fidp
->fs
.xattr
.len
< off
) {
2040 write_count
= fidp
->fs
.xattr
.len
- off
;
2041 if (write_count
> count
) {
2042 write_count
= count
;
2044 err
= pdu_marshal(pdu
, offset
, "d", write_count
);
2049 fidp
->fs
.xattr
.copied_len
+= write_count
;
2051 * Now copy the content from sg list
2053 for (i
= 0; i
< cnt
; i
++) {
2054 if (write_count
> sg
[i
].iov_len
) {
2055 to_copy
= sg
[i
].iov_len
;
2057 to_copy
= write_count
;
2059 memcpy((char *)fidp
->fs
.xattr
.value
+ off
, sg
[i
].iov_base
, to_copy
);
2060 /* updating vs->off since we are not using below */
2062 write_count
-= to_copy
;
2068 static void coroutine_fn
v9fs_write(void *opaque
)
2078 V9fsPDU
*pdu
= opaque
;
2079 V9fsState
*s
= pdu
->s
;
2080 QEMUIOVector qiov_full
;
2083 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &count
);
2085 pdu_complete(pdu
, err
);
2089 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, count
, true);
2090 trace_v9fs_write(pdu
->tag
, pdu
->id
, fid
, off
, count
, qiov_full
.niov
);
2092 fidp
= get_fid(pdu
, fid
);
2097 if (fidp
->fid_type
== P9_FID_FILE
) {
2098 if (fidp
->fs
.fd
== -1) {
2102 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
2104 * setxattr operation
2106 err
= v9fs_xattr_write(s
, pdu
, fidp
, off
, count
,
2107 qiov_full
.iov
, qiov_full
.niov
);
2113 qemu_iovec_init(&qiov
, qiov_full
.niov
);
2115 qemu_iovec_reset(&qiov
);
2116 qemu_iovec_concat(&qiov
, &qiov_full
, total
, qiov_full
.size
- total
);
2118 print_sg(qiov
.iov
, qiov
.niov
);
2120 /* Loop in case of EINTR */
2122 len
= v9fs_co_pwritev(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
2127 } while (len
== -EINTR
&& !pdu
->cancelled
);
2129 /* IO error return the error */
2133 } while (total
< count
&& len
> 0);
2136 err
= pdu_marshal(pdu
, offset
, "d", total
);
2141 trace_v9fs_write_return(pdu
->tag
, pdu
->id
, total
, err
);
2143 qemu_iovec_destroy(&qiov
);
2147 qemu_iovec_destroy(&qiov_full
);
2148 pdu_complete(pdu
, err
);
2151 static void coroutine_fn
v9fs_create(void *opaque
)
2163 V9fsString extension
;
2165 V9fsPDU
*pdu
= opaque
;
2166 V9fsState
*s
= pdu
->s
;
2168 v9fs_path_init(&path
);
2169 v9fs_string_init(&name
);
2170 v9fs_string_init(&extension
);
2171 err
= pdu_unmarshal(pdu
, offset
, "dsdbs", &fid
, &name
,
2172 &perm
, &mode
, &extension
);
2176 trace_v9fs_create(pdu
->tag
, pdu
->id
, fid
, name
.data
, perm
, mode
);
2178 if (name_is_illegal(name
.data
)) {
2183 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2188 fidp
= get_fid(pdu
, fid
);
2193 if (fidp
->fid_type
!= P9_FID_NONE
) {
2197 if (perm
& P9_STAT_MODE_DIR
) {
2198 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, perm
& 0777,
2199 fidp
->uid
, -1, &stbuf
);
2203 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2207 v9fs_path_write_lock(s
);
2208 v9fs_path_copy(&fidp
->path
, &path
);
2209 v9fs_path_unlock(s
);
2210 err
= v9fs_co_opendir(pdu
, fidp
);
2214 fidp
->fid_type
= P9_FID_DIR
;
2215 } else if (perm
& P9_STAT_MODE_SYMLINK
) {
2216 err
= v9fs_co_symlink(pdu
, fidp
, &name
,
2217 extension
.data
, -1 , &stbuf
);
2221 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2225 v9fs_path_write_lock(s
);
2226 v9fs_path_copy(&fidp
->path
, &path
);
2227 v9fs_path_unlock(s
);
2228 } else if (perm
& P9_STAT_MODE_LINK
) {
2229 int32_t ofid
= atoi(extension
.data
);
2230 V9fsFidState
*ofidp
= get_fid(pdu
, ofid
);
2231 if (ofidp
== NULL
) {
2235 err
= v9fs_co_link(pdu
, ofidp
, fidp
, &name
);
2236 put_fid(pdu
, ofidp
);
2240 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2242 fidp
->fid_type
= P9_FID_NONE
;
2245 v9fs_path_write_lock(s
);
2246 v9fs_path_copy(&fidp
->path
, &path
);
2247 v9fs_path_unlock(s
);
2248 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2250 fidp
->fid_type
= P9_FID_NONE
;
2253 } else if (perm
& P9_STAT_MODE_DEVICE
) {
2255 uint32_t major
, minor
;
2258 if (sscanf(extension
.data
, "%c %u %u", &ctype
, &major
, &minor
) != 3) {
2275 nmode
|= perm
& 0777;
2276 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2277 makedev(major
, minor
), nmode
, &stbuf
);
2281 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2285 v9fs_path_write_lock(s
);
2286 v9fs_path_copy(&fidp
->path
, &path
);
2287 v9fs_path_unlock(s
);
2288 } else if (perm
& P9_STAT_MODE_NAMED_PIPE
) {
2289 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2290 0, S_IFIFO
| (perm
& 0777), &stbuf
);
2294 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2298 v9fs_path_write_lock(s
);
2299 v9fs_path_copy(&fidp
->path
, &path
);
2300 v9fs_path_unlock(s
);
2301 } else if (perm
& P9_STAT_MODE_SOCKET
) {
2302 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2303 0, S_IFSOCK
| (perm
& 0777), &stbuf
);
2307 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2311 v9fs_path_write_lock(s
);
2312 v9fs_path_copy(&fidp
->path
, &path
);
2313 v9fs_path_unlock(s
);
2315 err
= v9fs_co_open2(pdu
, fidp
, &name
, -1,
2316 omode_to_uflags(mode
)|O_CREAT
, perm
, &stbuf
);
2320 fidp
->fid_type
= P9_FID_FILE
;
2321 fidp
->open_flags
= omode_to_uflags(mode
);
2322 if (fidp
->open_flags
& O_EXCL
) {
2324 * We let the host file system do O_EXCL check
2325 * We should not reclaim such fd
2327 fidp
->flags
|= FID_NON_RECLAIMABLE
;
2330 iounit
= get_iounit(pdu
, &fidp
->path
);
2331 stat_to_qid(&stbuf
, &qid
);
2332 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
2337 trace_v9fs_create_return(pdu
->tag
, pdu
->id
,
2338 qid
.type
, qid
.version
, qid
.path
, iounit
);
2342 pdu_complete(pdu
, err
);
2343 v9fs_string_free(&name
);
2344 v9fs_string_free(&extension
);
2345 v9fs_path_free(&path
);
2348 static void coroutine_fn
v9fs_symlink(void *opaque
)
2350 V9fsPDU
*pdu
= opaque
;
2353 V9fsFidState
*dfidp
;
2361 v9fs_string_init(&name
);
2362 v9fs_string_init(&symname
);
2363 err
= pdu_unmarshal(pdu
, offset
, "dssd", &dfid
, &name
, &symname
, &gid
);
2367 trace_v9fs_symlink(pdu
->tag
, pdu
->id
, dfid
, name
.data
, symname
.data
, gid
);
2369 if (name_is_illegal(name
.data
)) {
2374 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2379 dfidp
= get_fid(pdu
, dfid
);
2380 if (dfidp
== NULL
) {
2384 err
= v9fs_co_symlink(pdu
, dfidp
, &name
, symname
.data
, gid
, &stbuf
);
2388 stat_to_qid(&stbuf
, &qid
);
2389 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
2394 trace_v9fs_symlink_return(pdu
->tag
, pdu
->id
,
2395 qid
.type
, qid
.version
, qid
.path
);
2397 put_fid(pdu
, dfidp
);
2399 pdu_complete(pdu
, err
);
2400 v9fs_string_free(&name
);
2401 v9fs_string_free(&symname
);
2404 static void coroutine_fn
v9fs_flush(void *opaque
)
2409 V9fsPDU
*cancel_pdu
= NULL
;
2410 V9fsPDU
*pdu
= opaque
;
2411 V9fsState
*s
= pdu
->s
;
2413 err
= pdu_unmarshal(pdu
, offset
, "w", &tag
);
2415 pdu_complete(pdu
, err
);
2418 trace_v9fs_flush(pdu
->tag
, pdu
->id
, tag
);
2420 if (pdu
->tag
== tag
) {
2421 warn_report("the guest sent a self-referencing 9P flush request");
2423 QLIST_FOREACH(cancel_pdu
, &s
->active_list
, next
) {
2424 if (cancel_pdu
->tag
== tag
) {
2430 cancel_pdu
->cancelled
= 1;
2432 * Wait for pdu to complete.
2434 qemu_co_queue_wait(&cancel_pdu
->complete
, NULL
);
2435 if (!qemu_co_queue_next(&cancel_pdu
->complete
)) {
2436 cancel_pdu
->cancelled
= 0;
2437 pdu_free(cancel_pdu
);
2440 pdu_complete(pdu
, 7);
2443 static void coroutine_fn
v9fs_link(void *opaque
)
2445 V9fsPDU
*pdu
= opaque
;
2446 int32_t dfid
, oldfid
;
2447 V9fsFidState
*dfidp
, *oldfidp
;
2452 v9fs_string_init(&name
);
2453 err
= pdu_unmarshal(pdu
, offset
, "dds", &dfid
, &oldfid
, &name
);
2457 trace_v9fs_link(pdu
->tag
, pdu
->id
, dfid
, oldfid
, name
.data
);
2459 if (name_is_illegal(name
.data
)) {
2464 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2469 dfidp
= get_fid(pdu
, dfid
);
2470 if (dfidp
== NULL
) {
2475 oldfidp
= get_fid(pdu
, oldfid
);
2476 if (oldfidp
== NULL
) {
2480 err
= v9fs_co_link(pdu
, oldfidp
, dfidp
, &name
);
2484 put_fid(pdu
, oldfidp
);
2486 put_fid(pdu
, dfidp
);
2488 v9fs_string_free(&name
);
2489 pdu_complete(pdu
, err
);
2492 /* Only works with path name based fid */
2493 static void coroutine_fn
v9fs_remove(void *opaque
)
2499 V9fsPDU
*pdu
= opaque
;
2501 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
2505 trace_v9fs_remove(pdu
->tag
, pdu
->id
, fid
);
2507 fidp
= get_fid(pdu
, fid
);
2512 /* if fs driver is not path based, return EOPNOTSUPP */
2513 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2518 * IF the file is unlinked, we cannot reopen
2519 * the file later. So don't reclaim fd
2521 err
= v9fs_mark_fids_unreclaim(pdu
, &fidp
->path
);
2525 err
= v9fs_co_remove(pdu
, &fidp
->path
);
2530 /* For TREMOVE we need to clunk the fid even on failed remove */
2531 clunk_fid(pdu
->s
, fidp
->fid
);
2534 pdu_complete(pdu
, err
);
2537 static void coroutine_fn
v9fs_unlinkat(void *opaque
)
2541 int32_t dfid
, flags
, rflags
= 0;
2544 V9fsFidState
*dfidp
;
2545 V9fsPDU
*pdu
= opaque
;
2547 v9fs_string_init(&name
);
2548 err
= pdu_unmarshal(pdu
, offset
, "dsd", &dfid
, &name
, &flags
);
2553 if (name_is_illegal(name
.data
)) {
2558 if (!strcmp(".", name
.data
)) {
2563 if (!strcmp("..", name
.data
)) {
2568 if (flags
& ~P9_DOTL_AT_REMOVEDIR
) {
2573 if (flags
& P9_DOTL_AT_REMOVEDIR
) {
2574 rflags
|= AT_REMOVEDIR
;
2577 dfidp
= get_fid(pdu
, dfid
);
2578 if (dfidp
== NULL
) {
2583 * IF the file is unlinked, we cannot reopen
2584 * the file later. So don't reclaim fd
2586 v9fs_path_init(&path
);
2587 err
= v9fs_co_name_to_path(pdu
, &dfidp
->path
, name
.data
, &path
);
2591 err
= v9fs_mark_fids_unreclaim(pdu
, &path
);
2595 err
= v9fs_co_unlinkat(pdu
, &dfidp
->path
, &name
, rflags
);
2600 put_fid(pdu
, dfidp
);
2601 v9fs_path_free(&path
);
2603 pdu_complete(pdu
, err
);
2604 v9fs_string_free(&name
);
2608 /* Only works with path name based fid */
2609 static int coroutine_fn
v9fs_complete_rename(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2615 V9fsFidState
*tfidp
;
2616 V9fsState
*s
= pdu
->s
;
2617 V9fsFidState
*dirfidp
= NULL
;
2619 v9fs_path_init(&new_path
);
2620 if (newdirfid
!= -1) {
2621 dirfidp
= get_fid(pdu
, newdirfid
);
2622 if (dirfidp
== NULL
) {
2626 if (fidp
->fid_type
!= P9_FID_NONE
) {
2630 err
= v9fs_co_name_to_path(pdu
, &dirfidp
->path
, name
->data
, &new_path
);
2635 char *dir_name
= g_path_get_dirname(fidp
->path
.data
);
2638 v9fs_path_init(&dir_path
);
2639 v9fs_path_sprintf(&dir_path
, "%s", dir_name
);
2642 err
= v9fs_co_name_to_path(pdu
, &dir_path
, name
->data
, &new_path
);
2643 v9fs_path_free(&dir_path
);
2648 err
= v9fs_co_rename(pdu
, &fidp
->path
, &new_path
);
2653 * Fixup fid's pointing to the old name to
2654 * start pointing to the new name
2656 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2657 if (v9fs_path_is_ancestor(&fidp
->path
, &tfidp
->path
)) {
2658 /* replace the name */
2659 v9fs_fix_path(&tfidp
->path
, &new_path
, strlen(fidp
->path
.data
));
2664 put_fid(pdu
, dirfidp
);
2666 v9fs_path_free(&new_path
);
2671 /* Only works with path name based fid */
2672 static void coroutine_fn
v9fs_rename(void *opaque
)
2680 V9fsPDU
*pdu
= opaque
;
2681 V9fsState
*s
= pdu
->s
;
2683 v9fs_string_init(&name
);
2684 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newdirfid
, &name
);
2689 if (name_is_illegal(name
.data
)) {
2694 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2699 fidp
= get_fid(pdu
, fid
);
2704 if (fidp
->fid_type
!= P9_FID_NONE
) {
2708 /* if fs driver is not path based, return EOPNOTSUPP */
2709 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2713 v9fs_path_write_lock(s
);
2714 err
= v9fs_complete_rename(pdu
, fidp
, newdirfid
, &name
);
2715 v9fs_path_unlock(s
);
2722 pdu_complete(pdu
, err
);
2723 v9fs_string_free(&name
);
2726 static int coroutine_fn
v9fs_fix_fid_paths(V9fsPDU
*pdu
, V9fsPath
*olddir
,
2727 V9fsString
*old_name
,
2729 V9fsString
*new_name
)
2731 V9fsFidState
*tfidp
;
2732 V9fsPath oldpath
, newpath
;
2733 V9fsState
*s
= pdu
->s
;
2736 v9fs_path_init(&oldpath
);
2737 v9fs_path_init(&newpath
);
2738 err
= v9fs_co_name_to_path(pdu
, olddir
, old_name
->data
, &oldpath
);
2742 err
= v9fs_co_name_to_path(pdu
, newdir
, new_name
->data
, &newpath
);
2748 * Fixup fid's pointing to the old name to
2749 * start pointing to the new name
2751 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2752 if (v9fs_path_is_ancestor(&oldpath
, &tfidp
->path
)) {
2753 /* replace the name */
2754 v9fs_fix_path(&tfidp
->path
, &newpath
, strlen(oldpath
.data
));
2758 v9fs_path_free(&oldpath
);
2759 v9fs_path_free(&newpath
);
2763 static int coroutine_fn
v9fs_complete_renameat(V9fsPDU
*pdu
, int32_t olddirfid
,
2764 V9fsString
*old_name
,
2766 V9fsString
*new_name
)
2769 V9fsState
*s
= pdu
->s
;
2770 V9fsFidState
*newdirfidp
= NULL
, *olddirfidp
= NULL
;
2772 olddirfidp
= get_fid(pdu
, olddirfid
);
2773 if (olddirfidp
== NULL
) {
2777 if (newdirfid
!= -1) {
2778 newdirfidp
= get_fid(pdu
, newdirfid
);
2779 if (newdirfidp
== NULL
) {
2784 newdirfidp
= get_fid(pdu
, olddirfid
);
2787 err
= v9fs_co_renameat(pdu
, &olddirfidp
->path
, old_name
,
2788 &newdirfidp
->path
, new_name
);
2792 if (s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
) {
2793 /* Only for path based fid we need to do the below fixup */
2794 err
= v9fs_fix_fid_paths(pdu
, &olddirfidp
->path
, old_name
,
2795 &newdirfidp
->path
, new_name
);
2799 put_fid(pdu
, olddirfidp
);
2802 put_fid(pdu
, newdirfidp
);
2807 static void coroutine_fn
v9fs_renameat(void *opaque
)
2811 V9fsPDU
*pdu
= opaque
;
2812 V9fsState
*s
= pdu
->s
;
2813 int32_t olddirfid
, newdirfid
;
2814 V9fsString old_name
, new_name
;
2816 v9fs_string_init(&old_name
);
2817 v9fs_string_init(&new_name
);
2818 err
= pdu_unmarshal(pdu
, offset
, "dsds", &olddirfid
,
2819 &old_name
, &newdirfid
, &new_name
);
2824 if (name_is_illegal(old_name
.data
) || name_is_illegal(new_name
.data
)) {
2829 if (!strcmp(".", old_name
.data
) || !strcmp("..", old_name
.data
) ||
2830 !strcmp(".", new_name
.data
) || !strcmp("..", new_name
.data
)) {
2835 v9fs_path_write_lock(s
);
2836 err
= v9fs_complete_renameat(pdu
, olddirfid
,
2837 &old_name
, newdirfid
, &new_name
);
2838 v9fs_path_unlock(s
);
2844 pdu_complete(pdu
, err
);
2845 v9fs_string_free(&old_name
);
2846 v9fs_string_free(&new_name
);
2849 static void coroutine_fn
v9fs_wstat(void *opaque
)
2858 V9fsPDU
*pdu
= opaque
;
2859 V9fsState
*s
= pdu
->s
;
2861 v9fs_stat_init(&v9stat
);
2862 err
= pdu_unmarshal(pdu
, offset
, "dwS", &fid
, &unused
, &v9stat
);
2866 trace_v9fs_wstat(pdu
->tag
, pdu
->id
, fid
,
2867 v9stat
.mode
, v9stat
.atime
, v9stat
.mtime
);
2869 fidp
= get_fid(pdu
, fid
);
2874 /* do we need to sync the file? */
2875 if (donttouch_stat(&v9stat
)) {
2876 err
= v9fs_co_fsync(pdu
, fidp
, 0);
2879 if (v9stat
.mode
!= -1) {
2881 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2885 v9_mode
= stat_to_v9mode(&stbuf
);
2886 if ((v9stat
.mode
& P9_STAT_MODE_TYPE_BITS
) !=
2887 (v9_mode
& P9_STAT_MODE_TYPE_BITS
)) {
2888 /* Attempting to change the type */
2892 err
= v9fs_co_chmod(pdu
, &fidp
->path
,
2893 v9mode_to_mode(v9stat
.mode
,
2894 &v9stat
.extension
));
2899 if (v9stat
.mtime
!= -1 || v9stat
.atime
!= -1) {
2900 struct timespec times
[2];
2901 if (v9stat
.atime
!= -1) {
2902 times
[0].tv_sec
= v9stat
.atime
;
2903 times
[0].tv_nsec
= 0;
2905 times
[0].tv_nsec
= UTIME_OMIT
;
2907 if (v9stat
.mtime
!= -1) {
2908 times
[1].tv_sec
= v9stat
.mtime
;
2909 times
[1].tv_nsec
= 0;
2911 times
[1].tv_nsec
= UTIME_OMIT
;
2913 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
2918 if (v9stat
.n_gid
!= -1 || v9stat
.n_uid
!= -1) {
2919 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9stat
.n_uid
, v9stat
.n_gid
);
2924 if (v9stat
.name
.size
!= 0) {
2925 v9fs_path_write_lock(s
);
2926 err
= v9fs_complete_rename(pdu
, fidp
, -1, &v9stat
.name
);
2927 v9fs_path_unlock(s
);
2932 if (v9stat
.length
!= -1) {
2933 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9stat
.length
);
2942 v9fs_stat_free(&v9stat
);
2943 pdu_complete(pdu
, err
);
2946 static int v9fs_fill_statfs(V9fsState
*s
, V9fsPDU
*pdu
, struct statfs
*stbuf
)
2958 int32_t bsize_factor
;
2961 * compute bsize factor based on host file system block size
2964 bsize_factor
= (s
->msize
- P9_IOHDRSZ
)/stbuf
->f_bsize
;
2965 if (!bsize_factor
) {
2968 f_type
= stbuf
->f_type
;
2969 f_bsize
= stbuf
->f_bsize
;
2970 f_bsize
*= bsize_factor
;
2972 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2973 * adjust(divide) the number of blocks, free blocks and available
2974 * blocks by bsize factor
2976 f_blocks
= stbuf
->f_blocks
/bsize_factor
;
2977 f_bfree
= stbuf
->f_bfree
/bsize_factor
;
2978 f_bavail
= stbuf
->f_bavail
/bsize_factor
;
2979 f_files
= stbuf
->f_files
;
2980 f_ffree
= stbuf
->f_ffree
;
2981 fsid_val
= (unsigned int) stbuf
->f_fsid
.__val
[0] |
2982 (unsigned long long)stbuf
->f_fsid
.__val
[1] << 32;
2983 f_namelen
= stbuf
->f_namelen
;
2985 return pdu_marshal(pdu
, offset
, "ddqqqqqqd",
2986 f_type
, f_bsize
, f_blocks
, f_bfree
,
2987 f_bavail
, f_files
, f_ffree
,
2988 fsid_val
, f_namelen
);
2991 static void coroutine_fn
v9fs_statfs(void *opaque
)
2997 struct statfs stbuf
;
2998 V9fsPDU
*pdu
= opaque
;
2999 V9fsState
*s
= pdu
->s
;
3001 retval
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
3005 fidp
= get_fid(pdu
, fid
);
3010 retval
= v9fs_co_statfs(pdu
, &fidp
->path
, &stbuf
);
3014 retval
= v9fs_fill_statfs(s
, pdu
, &stbuf
);
3022 pdu_complete(pdu
, retval
);
3025 static void coroutine_fn
v9fs_mknod(void *opaque
)
3038 V9fsPDU
*pdu
= opaque
;
3040 v9fs_string_init(&name
);
3041 err
= pdu_unmarshal(pdu
, offset
, "dsdddd", &fid
, &name
, &mode
,
3042 &major
, &minor
, &gid
);
3046 trace_v9fs_mknod(pdu
->tag
, pdu
->id
, fid
, mode
, major
, minor
);
3048 if (name_is_illegal(name
.data
)) {
3053 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3058 fidp
= get_fid(pdu
, fid
);
3063 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, gid
,
3064 makedev(major
, minor
), mode
, &stbuf
);
3068 stat_to_qid(&stbuf
, &qid
);
3069 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3074 trace_v9fs_mknod_return(pdu
->tag
, pdu
->id
,
3075 qid
.type
, qid
.version
, qid
.path
);
3079 pdu_complete(pdu
, err
);
3080 v9fs_string_free(&name
);
3084 * Implement posix byte range locking code
3085 * Server side handling of locking code is very simple, because 9p server in
3086 * QEMU can handle only one client. And most of the lock handling
3087 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3088 * do any thing in * qemu 9p server side lock code path.
3089 * So when a TLOCK request comes, always return success
3091 static void coroutine_fn
v9fs_lock(void *opaque
)
3097 int32_t fid
, err
= 0;
3098 V9fsPDU
*pdu
= opaque
;
3100 v9fs_string_init(&flock
.client_id
);
3101 err
= pdu_unmarshal(pdu
, offset
, "dbdqqds", &fid
, &flock
.type
,
3102 &flock
.flags
, &flock
.start
, &flock
.length
,
3103 &flock
.proc_id
, &flock
.client_id
);
3107 trace_v9fs_lock(pdu
->tag
, pdu
->id
, fid
,
3108 flock
.type
, flock
.start
, flock
.length
);
3111 /* We support only block flag now (that too ignored currently) */
3112 if (flock
.flags
& ~P9_LOCK_FLAGS_BLOCK
) {
3116 fidp
= get_fid(pdu
, fid
);
3121 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3125 err
= pdu_marshal(pdu
, offset
, "b", P9_LOCK_SUCCESS
);
3130 trace_v9fs_lock_return(pdu
->tag
, pdu
->id
, P9_LOCK_SUCCESS
);
3134 pdu_complete(pdu
, err
);
3135 v9fs_string_free(&flock
.client_id
);
3139 * When a TGETLOCK request comes, always return success because all lock
3140 * handling is done by client's VFS layer.
3142 static void coroutine_fn
v9fs_getlock(void *opaque
)
3148 int32_t fid
, err
= 0;
3149 V9fsPDU
*pdu
= opaque
;
3151 v9fs_string_init(&glock
.client_id
);
3152 err
= pdu_unmarshal(pdu
, offset
, "dbqqds", &fid
, &glock
.type
,
3153 &glock
.start
, &glock
.length
, &glock
.proc_id
,
3158 trace_v9fs_getlock(pdu
->tag
, pdu
->id
, fid
,
3159 glock
.type
, glock
.start
, glock
.length
);
3161 fidp
= get_fid(pdu
, fid
);
3166 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3170 glock
.type
= P9_LOCK_TYPE_UNLCK
;
3171 err
= pdu_marshal(pdu
, offset
, "bqqds", glock
.type
,
3172 glock
.start
, glock
.length
, glock
.proc_id
,
3178 trace_v9fs_getlock_return(pdu
->tag
, pdu
->id
, glock
.type
, glock
.start
,
3179 glock
.length
, glock
.proc_id
);
3183 pdu_complete(pdu
, err
);
3184 v9fs_string_free(&glock
.client_id
);
3187 static void coroutine_fn
v9fs_mkdir(void *opaque
)
3189 V9fsPDU
*pdu
= opaque
;
3200 v9fs_string_init(&name
);
3201 err
= pdu_unmarshal(pdu
, offset
, "dsdd", &fid
, &name
, &mode
, &gid
);
3205 trace_v9fs_mkdir(pdu
->tag
, pdu
->id
, fid
, name
.data
, mode
, gid
);
3207 if (name_is_illegal(name
.data
)) {
3212 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3217 fidp
= get_fid(pdu
, fid
);
3222 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, mode
, fidp
->uid
, gid
, &stbuf
);
3226 stat_to_qid(&stbuf
, &qid
);
3227 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3232 trace_v9fs_mkdir_return(pdu
->tag
, pdu
->id
,
3233 qid
.type
, qid
.version
, qid
.path
, err
);
3237 pdu_complete(pdu
, err
);
3238 v9fs_string_free(&name
);
3241 static void coroutine_fn
v9fs_xattrwalk(void *opaque
)
3247 int32_t fid
, newfid
;
3248 V9fsFidState
*file_fidp
;
3249 V9fsFidState
*xattr_fidp
= NULL
;
3250 V9fsPDU
*pdu
= opaque
;
3251 V9fsState
*s
= pdu
->s
;
3253 v9fs_string_init(&name
);
3254 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newfid
, &name
);
3258 trace_v9fs_xattrwalk(pdu
->tag
, pdu
->id
, fid
, newfid
, name
.data
);
3260 file_fidp
= get_fid(pdu
, fid
);
3261 if (file_fidp
== NULL
) {
3265 xattr_fidp
= alloc_fid(s
, newfid
);
3266 if (xattr_fidp
== NULL
) {
3270 v9fs_path_copy(&xattr_fidp
->path
, &file_fidp
->path
);
3271 if (!v9fs_string_size(&name
)) {
3273 * listxattr request. Get the size first
3275 size
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
, NULL
, 0);
3278 clunk_fid(s
, xattr_fidp
->fid
);
3282 * Read the xattr value
3284 xattr_fidp
->fs
.xattr
.len
= size
;
3285 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3286 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3287 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3289 err
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
,
3290 xattr_fidp
->fs
.xattr
.value
,
3291 xattr_fidp
->fs
.xattr
.len
);
3293 clunk_fid(s
, xattr_fidp
->fid
);
3297 err
= pdu_marshal(pdu
, offset
, "q", size
);
3304 * specific xattr fid. We check for xattr
3305 * presence also collect the xattr size
3307 size
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3311 clunk_fid(s
, xattr_fidp
->fid
);
3315 * Read the xattr value
3317 xattr_fidp
->fs
.xattr
.len
= size
;
3318 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3319 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3320 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3322 err
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3323 &name
, xattr_fidp
->fs
.xattr
.value
,
3324 xattr_fidp
->fs
.xattr
.len
);
3326 clunk_fid(s
, xattr_fidp
->fid
);
3330 err
= pdu_marshal(pdu
, offset
, "q", size
);
3336 trace_v9fs_xattrwalk_return(pdu
->tag
, pdu
->id
, size
);
3338 put_fid(pdu
, file_fidp
);
3340 put_fid(pdu
, xattr_fidp
);
3343 pdu_complete(pdu
, err
);
3344 v9fs_string_free(&name
);
3347 static void coroutine_fn
v9fs_xattrcreate(void *opaque
)
3349 int flags
, rflags
= 0;
3355 V9fsFidState
*file_fidp
;
3356 V9fsFidState
*xattr_fidp
;
3357 V9fsPDU
*pdu
= opaque
;
3359 v9fs_string_init(&name
);
3360 err
= pdu_unmarshal(pdu
, offset
, "dsqd", &fid
, &name
, &size
, &flags
);
3364 trace_v9fs_xattrcreate(pdu
->tag
, pdu
->id
, fid
, name
.data
, size
, flags
);
3366 if (flags
& ~(P9_XATTR_CREATE
| P9_XATTR_REPLACE
)) {
3371 if (flags
& P9_XATTR_CREATE
) {
3372 rflags
|= XATTR_CREATE
;
3375 if (flags
& P9_XATTR_REPLACE
) {
3376 rflags
|= XATTR_REPLACE
;
3379 if (size
> XATTR_SIZE_MAX
) {
3384 file_fidp
= get_fid(pdu
, fid
);
3385 if (file_fidp
== NULL
) {
3389 if (file_fidp
->fid_type
!= P9_FID_NONE
) {
3394 /* Make the file fid point to xattr */
3395 xattr_fidp
= file_fidp
;
3396 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3397 xattr_fidp
->fs
.xattr
.copied_len
= 0;
3398 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= false;
3399 xattr_fidp
->fs
.xattr
.len
= size
;
3400 xattr_fidp
->fs
.xattr
.flags
= rflags
;
3401 v9fs_string_init(&xattr_fidp
->fs
.xattr
.name
);
3402 v9fs_string_copy(&xattr_fidp
->fs
.xattr
.name
, &name
);
3403 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3406 put_fid(pdu
, file_fidp
);
3408 pdu_complete(pdu
, err
);
3409 v9fs_string_free(&name
);
3412 static void coroutine_fn
v9fs_readlink(void *opaque
)
3414 V9fsPDU
*pdu
= opaque
;
3421 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
3425 trace_v9fs_readlink(pdu
->tag
, pdu
->id
, fid
);
3426 fidp
= get_fid(pdu
, fid
);
3432 v9fs_string_init(&target
);
3433 err
= v9fs_co_readlink(pdu
, &fidp
->path
, &target
);
3437 err
= pdu_marshal(pdu
, offset
, "s", &target
);
3439 v9fs_string_free(&target
);
3443 trace_v9fs_readlink_return(pdu
->tag
, pdu
->id
, target
.data
);
3444 v9fs_string_free(&target
);
3448 pdu_complete(pdu
, err
);
3451 static CoroutineEntry
*pdu_co_handlers
[] = {
3452 [P9_TREADDIR
] = v9fs_readdir
,
3453 [P9_TSTATFS
] = v9fs_statfs
,
3454 [P9_TGETATTR
] = v9fs_getattr
,
3455 [P9_TSETATTR
] = v9fs_setattr
,
3456 [P9_TXATTRWALK
] = v9fs_xattrwalk
,
3457 [P9_TXATTRCREATE
] = v9fs_xattrcreate
,
3458 [P9_TMKNOD
] = v9fs_mknod
,
3459 [P9_TRENAME
] = v9fs_rename
,
3460 [P9_TLOCK
] = v9fs_lock
,
3461 [P9_TGETLOCK
] = v9fs_getlock
,
3462 [P9_TRENAMEAT
] = v9fs_renameat
,
3463 [P9_TREADLINK
] = v9fs_readlink
,
3464 [P9_TUNLINKAT
] = v9fs_unlinkat
,
3465 [P9_TMKDIR
] = v9fs_mkdir
,
3466 [P9_TVERSION
] = v9fs_version
,
3467 [P9_TLOPEN
] = v9fs_open
,
3468 [P9_TATTACH
] = v9fs_attach
,
3469 [P9_TSTAT
] = v9fs_stat
,
3470 [P9_TWALK
] = v9fs_walk
,
3471 [P9_TCLUNK
] = v9fs_clunk
,
3472 [P9_TFSYNC
] = v9fs_fsync
,
3473 [P9_TOPEN
] = v9fs_open
,
3474 [P9_TREAD
] = v9fs_read
,
3476 [P9_TAUTH
] = v9fs_auth
,
3478 [P9_TFLUSH
] = v9fs_flush
,
3479 [P9_TLINK
] = v9fs_link
,
3480 [P9_TSYMLINK
] = v9fs_symlink
,
3481 [P9_TCREATE
] = v9fs_create
,
3482 [P9_TLCREATE
] = v9fs_lcreate
,
3483 [P9_TWRITE
] = v9fs_write
,
3484 [P9_TWSTAT
] = v9fs_wstat
,
3485 [P9_TREMOVE
] = v9fs_remove
,
3488 static void coroutine_fn
v9fs_op_not_supp(void *opaque
)
3490 V9fsPDU
*pdu
= opaque
;
3491 pdu_complete(pdu
, -EOPNOTSUPP
);
3494 static void coroutine_fn
v9fs_fs_ro(void *opaque
)
3496 V9fsPDU
*pdu
= opaque
;
3497 pdu_complete(pdu
, -EROFS
);
3500 static inline bool is_read_only_op(V9fsPDU
*pdu
)
3527 void pdu_submit(V9fsPDU
*pdu
, P9MsgHeader
*hdr
)
3530 CoroutineEntry
*handler
;
3531 V9fsState
*s
= pdu
->s
;
3533 pdu
->size
= le32_to_cpu(hdr
->size_le
);
3535 pdu
->tag
= le16_to_cpu(hdr
->tag_le
);
3537 if (pdu
->id
>= ARRAY_SIZE(pdu_co_handlers
) ||
3538 (pdu_co_handlers
[pdu
->id
] == NULL
)) {
3539 handler
= v9fs_op_not_supp
;
3540 } else if (is_ro_export(&s
->ctx
) && !is_read_only_op(pdu
)) {
3541 handler
= v9fs_fs_ro
;
3543 handler
= pdu_co_handlers
[pdu
->id
];
3546 qemu_co_queue_init(&pdu
->complete
);
3547 co
= qemu_coroutine_create(handler
, pdu
);
3548 qemu_coroutine_enter(co
);
3551 /* Returns 0 on success, 1 on failure. */
3552 int v9fs_device_realize_common(V9fsState
*s
, const V9fsTransport
*t
,
3561 assert(!s
->transport
);
3564 /* initialize pdu allocator */
3565 QLIST_INIT(&s
->free_list
);
3566 QLIST_INIT(&s
->active_list
);
3567 for (i
= 0; i
< MAX_REQ
; i
++) {
3568 QLIST_INSERT_HEAD(&s
->free_list
, &s
->pdus
[i
], next
);
3573 v9fs_path_init(&path
);
3575 fse
= get_fsdev_fsentry(s
->fsconf
.fsdev_id
);
3578 /* We don't have a fsdev identified by fsdev_id */
3579 error_setg(errp
, "9pfs device couldn't find fsdev with the "
3581 s
->fsconf
.fsdev_id
? s
->fsconf
.fsdev_id
: "NULL");
3585 if (!s
->fsconf
.tag
) {
3586 /* we haven't specified a mount_tag */
3587 error_setg(errp
, "fsdev with id %s needs mount_tag arguments",
3588 s
->fsconf
.fsdev_id
);
3592 s
->ctx
.export_flags
= fse
->export_flags
;
3593 s
->ctx
.fs_root
= g_strdup(fse
->path
);
3594 s
->ctx
.exops
.get_st_gen
= NULL
;
3595 len
= strlen(s
->fsconf
.tag
);
3596 if (len
> MAX_TAG_LEN
- 1) {
3597 error_setg(errp
, "mount tag '%s' (%d bytes) is longer than "
3598 "maximum (%d bytes)", s
->fsconf
.tag
, len
, MAX_TAG_LEN
- 1);
3602 s
->tag
= g_strdup(s
->fsconf
.tag
);
3607 s
->ctx
.fmode
= fse
->fmode
;
3608 s
->ctx
.dmode
= fse
->dmode
;
3611 qemu_co_rwlock_init(&s
->rename_lock
);
3613 if (s
->ops
->init(&s
->ctx
, errp
) < 0) {
3614 error_prepend(errp
, "cannot initialize fsdev '%s': ",
3615 s
->fsconf
.fsdev_id
);
3620 * Check details of export path, We need to use fs driver
3621 * call back to do that. Since we are in the init path, we don't
3622 * use co-routines here.
3624 if (s
->ops
->name_to_path(&s
->ctx
, NULL
, "/", &path
) < 0) {
3626 "error in converting name to path %s", strerror(errno
));
3629 if (s
->ops
->lstat(&s
->ctx
, &path
, &stat
)) {
3630 error_setg(errp
, "share path %s does not exist", fse
->path
);
3632 } else if (!S_ISDIR(stat
.st_mode
)) {
3633 error_setg(errp
, "share path %s is not a directory", fse
->path
);
3637 s
->ctx
.fst
= &fse
->fst
;
3638 fsdev_throttle_init(s
->ctx
.fst
);
3640 v9fs_path_free(&path
);
3645 if (s
->ops
&& s
->ops
->cleanup
&& s
->ctx
.private) {
3646 s
->ops
->cleanup(&s
->ctx
);
3649 g_free(s
->ctx
.fs_root
);
3650 v9fs_path_free(&path
);
3655 void v9fs_device_unrealize_common(V9fsState
*s
, Error
**errp
)
3657 if (s
->ops
->cleanup
) {
3658 s
->ops
->cleanup(&s
->ctx
);
3660 fsdev_throttle_cleanup(s
->ctx
.fst
);
3662 g_free(s
->ctx
.fs_root
);
3665 typedef struct VirtfsCoResetData
{
3668 } VirtfsCoResetData
;
3670 static void coroutine_fn
virtfs_co_reset(void *opaque
)
3672 VirtfsCoResetData
*data
= opaque
;
3674 virtfs_reset(&data
->pdu
);
3678 void v9fs_reset(V9fsState
*s
)
3680 VirtfsCoResetData data
= { .pdu
= { .s
= s
}, .done
= false };
3683 while (!QLIST_EMPTY(&s
->active_list
)) {
3684 aio_poll(qemu_get_aio_context(), true);
3687 co
= qemu_coroutine_create(virtfs_co_reset
, &data
);
3688 qemu_coroutine_enter(co
);
3690 while (!data
.done
) {
3691 aio_poll(qemu_get_aio_context(), true);
3695 static void __attribute__((__constructor__
)) v9fs_set_fd_limit(void)
3698 if (getrlimit(RLIMIT_NOFILE
, &rlim
) < 0) {
3699 error_report("Failed to get the resource limit");
3702 open_fd_hw
= rlim
.rlim_cur
- MIN(400, rlim
.rlim_cur
/3);
3703 open_fd_rc
= rlim
.rlim_cur
/2;