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.
15 #include <glib/gprintf.h>
17 #include "hw/virtio.h"
19 #include "qemu_socket.h"
20 #include "hw/virtio-pci.h"
21 #include "virtio-9p.h"
22 #include "fsdev/qemu-fsdev.h"
23 #include "virtio-9p-xattr.h"
24 #include "virtio-9p-coth.h"
26 #include "migration.h"
30 static int open_fd_rc
;
44 static int omode_to_uflags(int8_t mode
)
78 struct dotl_openflag_map
{
83 static int dotl_to_open_flags(int flags
)
87 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
88 * and P9_DOTL_NOACCESS
90 int oflags
= flags
& O_ACCMODE
;
92 struct dotl_openflag_map dotl_oflag_map
[] = {
93 { P9_DOTL_CREATE
, O_CREAT
},
94 { P9_DOTL_EXCL
, O_EXCL
},
95 { P9_DOTL_NOCTTY
, O_NOCTTY
},
96 { P9_DOTL_TRUNC
, O_TRUNC
},
97 { P9_DOTL_APPEND
, O_APPEND
},
98 { P9_DOTL_NONBLOCK
, O_NONBLOCK
} ,
99 { P9_DOTL_DSYNC
, O_DSYNC
},
100 { P9_DOTL_FASYNC
, FASYNC
},
101 { P9_DOTL_DIRECT
, O_DIRECT
},
102 { P9_DOTL_LARGEFILE
, O_LARGEFILE
},
103 { P9_DOTL_DIRECTORY
, O_DIRECTORY
},
104 { P9_DOTL_NOFOLLOW
, O_NOFOLLOW
},
105 { P9_DOTL_NOATIME
, O_NOATIME
},
106 { P9_DOTL_SYNC
, O_SYNC
},
109 for (i
= 0; i
< ARRAY_SIZE(dotl_oflag_map
); i
++) {
110 if (flags
& dotl_oflag_map
[i
].dotl_flag
) {
111 oflags
|= dotl_oflag_map
[i
].open_flag
;
118 void cred_init(FsCred
*credp
)
126 static int get_dotl_openflags(V9fsState
*s
, int oflags
)
130 * Filter the client open flags
132 flags
= dotl_to_open_flags(oflags
);
133 flags
&= ~(O_NOCTTY
| O_ASYNC
| O_CREAT
);
135 * Ignore direct disk access hint until the server supports it.
141 void v9fs_string_init(V9fsString
*str
)
147 void v9fs_string_free(V9fsString
*str
)
154 void v9fs_string_null(V9fsString
*str
)
156 v9fs_string_free(str
);
159 void GCC_FMT_ATTR(2, 3)
160 v9fs_string_sprintf(V9fsString
*str
, const char *fmt
, ...)
164 v9fs_string_free(str
);
167 str
->size
= g_vasprintf(&str
->data
, fmt
, ap
);
171 void v9fs_string_copy(V9fsString
*lhs
, V9fsString
*rhs
)
173 v9fs_string_free(lhs
);
174 v9fs_string_sprintf(lhs
, "%s", rhs
->data
);
177 void v9fs_path_init(V9fsPath
*path
)
183 void v9fs_path_free(V9fsPath
*path
)
190 void v9fs_path_copy(V9fsPath
*lhs
, V9fsPath
*rhs
)
193 lhs
->data
= g_malloc(rhs
->size
);
194 memcpy(lhs
->data
, rhs
->data
, rhs
->size
);
195 lhs
->size
= rhs
->size
;
198 int v9fs_name_to_path(V9fsState
*s
, V9fsPath
*dirpath
,
199 const char *name
, V9fsPath
*path
)
202 err
= s
->ops
->name_to_path(&s
->ctx
, dirpath
, name
, path
);
210 * Return TRUE if s1 is an ancestor of s2.
212 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
213 * As a special case, We treat s1 as ancestor of s2 if they are same!
215 static int v9fs_path_is_ancestor(V9fsPath
*s1
, V9fsPath
*s2
)
217 if (!strncmp(s1
->data
, s2
->data
, s1
->size
- 1)) {
218 if (s2
->data
[s1
->size
- 1] == '\0' || s2
->data
[s1
->size
- 1] == '/') {
225 static size_t v9fs_string_size(V9fsString
*str
)
231 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
232 static int v9fs_reopen_fid(V9fsPDU
*pdu
, V9fsFidState
*f
)
235 if (f
->fid_type
== P9_FID_FILE
) {
236 if (f
->fs
.fd
== -1) {
238 err
= v9fs_co_open(pdu
, f
, f
->open_flags
);
239 } while (err
== -EINTR
&& !pdu
->cancelled
);
241 } else if (f
->fid_type
== P9_FID_DIR
) {
242 if (f
->fs
.dir
== NULL
) {
244 err
= v9fs_co_opendir(pdu
, f
);
245 } while (err
== -EINTR
&& !pdu
->cancelled
);
251 static V9fsFidState
*get_fid(V9fsPDU
*pdu
, int32_t fid
)
255 V9fsState
*s
= pdu
->s
;
257 for (f
= s
->fid_list
; f
; f
= f
->next
) {
261 * Update the fid ref upfront so that
262 * we don't get reclaimed when we yield
267 * check whether we need to reopen the
268 * file. We might have closed the fd
269 * while trying to free up some file
272 err
= v9fs_reopen_fid(pdu
, f
);
278 * Mark the fid as referenced so that the LRU
279 * reclaim won't close the file descriptor
281 f
->flags
|= FID_REFERENCED
;
288 static V9fsFidState
*alloc_fid(V9fsState
*s
, int32_t fid
)
292 for (f
= s
->fid_list
; f
; f
= f
->next
) {
293 /* If fid is already there return NULL */
299 f
= g_malloc0(sizeof(V9fsFidState
));
301 f
->fid_type
= P9_FID_NONE
;
304 * Mark the fid as referenced so that the LRU
305 * reclaim won't close the file descriptor
307 f
->flags
|= FID_REFERENCED
;
308 f
->next
= s
->fid_list
;
314 static int v9fs_xattr_fid_clunk(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
318 if (fidp
->fs
.xattr
.copied_len
== -1) {
319 /* getxattr/listxattr fid */
323 * if this is fid for setxattr. clunk should
324 * result in setxattr localcall
326 if (fidp
->fs
.xattr
.len
!= fidp
->fs
.xattr
.copied_len
) {
327 /* clunk after partial write */
331 if (fidp
->fs
.xattr
.len
) {
332 retval
= v9fs_co_lsetxattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
,
333 fidp
->fs
.xattr
.value
,
335 fidp
->fs
.xattr
.flags
);
337 retval
= v9fs_co_lremovexattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
);
340 v9fs_string_free(&fidp
->fs
.xattr
.name
);
342 if (fidp
->fs
.xattr
.value
) {
343 g_free(fidp
->fs
.xattr
.value
);
348 static int free_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
352 if (fidp
->fid_type
== P9_FID_FILE
) {
353 /* If we reclaimed the fd no need to close */
354 if (fidp
->fs
.fd
!= -1) {
355 retval
= v9fs_co_close(pdu
, &fidp
->fs
);
357 } else if (fidp
->fid_type
== P9_FID_DIR
) {
358 if (fidp
->fs
.dir
!= NULL
) {
359 retval
= v9fs_co_closedir(pdu
, &fidp
->fs
);
361 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
362 retval
= v9fs_xattr_fid_clunk(pdu
, fidp
);
364 v9fs_path_free(&fidp
->path
);
369 static void put_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
374 * Don't free the fid if it is in reclaim list
376 if (!fidp
->ref
&& fidp
->clunked
) {
377 if (fidp
->fid
== pdu
->s
->root_fid
) {
379 * if the clunked fid is root fid then we
380 * have unmounted the fs on the client side.
381 * delete the migration blocker. Ideally, this
382 * should be hooked to transport close notification
384 if (pdu
->s
->migration_blocker
) {
385 migrate_del_blocker(pdu
->s
->migration_blocker
);
386 error_free(pdu
->s
->migration_blocker
);
387 pdu
->s
->migration_blocker
= NULL
;
394 static V9fsFidState
*clunk_fid(V9fsState
*s
, int32_t fid
)
396 V9fsFidState
**fidpp
, *fidp
;
398 for (fidpp
= &s
->fid_list
; *fidpp
; fidpp
= &(*fidpp
)->next
) {
399 if ((*fidpp
)->fid
== fid
) {
403 if (*fidpp
== NULL
) {
412 void v9fs_reclaim_fd(V9fsPDU
*pdu
)
414 int reclaim_count
= 0;
415 V9fsState
*s
= pdu
->s
;
416 V9fsFidState
*f
, *reclaim_list
= NULL
;
418 for (f
= s
->fid_list
; f
; f
= f
->next
) {
420 * Unlink fids cannot be reclaimed. Check
421 * for them and skip them. Also skip fids
422 * currently being operated on.
424 if (f
->ref
|| f
->flags
& FID_NON_RECLAIMABLE
) {
428 * if it is a recently referenced fid
429 * we leave the fid untouched and clear the
430 * reference bit. We come back to it later
431 * in the next iteration. (a simple LRU without
432 * moving list elements around)
434 if (f
->flags
& FID_REFERENCED
) {
435 f
->flags
&= ~FID_REFERENCED
;
439 * Add fids to reclaim list.
441 if (f
->fid_type
== P9_FID_FILE
) {
442 if (f
->fs
.fd
!= -1) {
444 * Up the reference count so that
445 * a clunk request won't free this fid
448 f
->rclm_lst
= reclaim_list
;
450 f
->fs_reclaim
.fd
= f
->fs
.fd
;
454 } else if (f
->fid_type
== P9_FID_DIR
) {
455 if (f
->fs
.dir
!= NULL
) {
457 * Up the reference count so that
458 * a clunk request won't free this fid
461 f
->rclm_lst
= reclaim_list
;
463 f
->fs_reclaim
.dir
= f
->fs
.dir
;
468 if (reclaim_count
>= open_fd_rc
) {
473 * Now close the fid in reclaim list. Free them if they
474 * are already clunked.
476 while (reclaim_list
) {
478 reclaim_list
= f
->rclm_lst
;
479 if (f
->fid_type
== P9_FID_FILE
) {
480 v9fs_co_close(pdu
, &f
->fs_reclaim
);
481 } else if (f
->fid_type
== P9_FID_DIR
) {
482 v9fs_co_closedir(pdu
, &f
->fs_reclaim
);
486 * Now drop the fid reference, free it
493 static int v9fs_mark_fids_unreclaim(V9fsPDU
*pdu
, V9fsPath
*path
)
496 V9fsState
*s
= pdu
->s
;
497 V9fsFidState
*fidp
, head_fid
;
499 head_fid
.next
= s
->fid_list
;
500 for (fidp
= s
->fid_list
; fidp
; fidp
= fidp
->next
) {
501 if (fidp
->path
.size
!= path
->size
) {
504 if (!memcmp(fidp
->path
.data
, path
->data
, path
->size
)) {
505 /* Mark the fid non reclaimable. */
506 fidp
->flags
|= FID_NON_RECLAIMABLE
;
508 /* reopen the file/dir if already closed */
509 err
= v9fs_reopen_fid(pdu
, fidp
);
514 * Go back to head of fid list because
515 * the list could have got updated when
516 * switched to the worker thread
526 static void virtfs_reset(V9fsPDU
*pdu
)
528 V9fsState
*s
= pdu
->s
;
529 V9fsFidState
*fidp
= NULL
;
532 while (s
->fid_list
) {
534 s
->fid_list
= fidp
->next
;
543 /* One or more unclunked fids found... */
544 error_report("9pfs:%s: One or more uncluncked fids "
545 "found during reset", __func__
);
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 fid_to_qid(V9fsPDU
*pdu
, V9fsFidState
*fidp
, V9fsQID
*qidp
)
598 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
602 stat_to_qid(&stbuf
, qidp
);
606 static V9fsPDU
*alloc_pdu(V9fsState
*s
)
610 if (!QLIST_EMPTY(&s
->free_list
)) {
611 pdu
= QLIST_FIRST(&s
->free_list
);
612 QLIST_REMOVE(pdu
, next
);
613 QLIST_INSERT_HEAD(&s
->active_list
, pdu
, next
);
618 static void free_pdu(V9fsState
*s
, V9fsPDU
*pdu
)
622 * Cancelled pdu are added back to the freelist
625 if (!pdu
->cancelled
) {
626 QLIST_REMOVE(pdu
, next
);
627 QLIST_INSERT_HEAD(&s
->free_list
, pdu
, next
);
632 size_t pdu_packunpack(void *addr
, struct iovec
*sg
, int sg_count
,
633 size_t offset
, size_t size
, int pack
)
638 for (i
= 0; size
&& i
< sg_count
; i
++) {
640 if (offset
>= sg
[i
].iov_len
) {
642 offset
-= sg
[i
].iov_len
;
645 len
= MIN(sg
[i
].iov_len
- offset
, size
);
647 memcpy(sg
[i
].iov_base
+ offset
, addr
, len
);
649 memcpy(addr
, sg
[i
].iov_base
+ offset
, len
);
664 static size_t pdu_unpack(void *dst
, V9fsPDU
*pdu
, size_t offset
, size_t size
)
666 return pdu_packunpack(dst
, pdu
->elem
.out_sg
, pdu
->elem
.out_num
,
670 static size_t pdu_pack(V9fsPDU
*pdu
, size_t offset
, const void *src
,
673 return pdu_packunpack((void *)src
, pdu
->elem
.in_sg
, pdu
->elem
.in_num
,
677 static size_t pdu_unmarshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
679 size_t old_offset
= offset
;
684 for (i
= 0; fmt
[i
]; i
++) {
687 uint8_t *valp
= va_arg(ap
, uint8_t *);
688 offset
+= pdu_unpack(valp
, pdu
, offset
, sizeof(*valp
));
693 valp
= va_arg(ap
, uint16_t *);
694 offset
+= pdu_unpack(&val
, pdu
, offset
, sizeof(val
));
695 *valp
= le16_to_cpu(val
);
700 valp
= va_arg(ap
, uint32_t *);
701 offset
+= pdu_unpack(&val
, pdu
, offset
, sizeof(val
));
702 *valp
= le32_to_cpu(val
);
707 valp
= va_arg(ap
, uint64_t *);
708 offset
+= pdu_unpack(&val
, pdu
, offset
, sizeof(val
));
709 *valp
= le64_to_cpu(val
);
713 V9fsString
*str
= va_arg(ap
, V9fsString
*);
714 offset
+= pdu_unmarshal(pdu
, offset
, "w", &str
->size
);
715 /* FIXME: sanity check str->size */
716 str
->data
= g_malloc(str
->size
+ 1);
717 offset
+= pdu_unpack(str
->data
, pdu
, offset
, str
->size
);
718 str
->data
[str
->size
] = 0;
722 V9fsQID
*qidp
= va_arg(ap
, V9fsQID
*);
723 offset
+= pdu_unmarshal(pdu
, offset
, "bdq",
724 &qidp
->type
, &qidp
->version
, &qidp
->path
);
728 V9fsStat
*statp
= va_arg(ap
, V9fsStat
*);
729 offset
+= pdu_unmarshal(pdu
, offset
, "wwdQdddqsssssddd",
730 &statp
->size
, &statp
->type
, &statp
->dev
,
731 &statp
->qid
, &statp
->mode
, &statp
->atime
,
732 &statp
->mtime
, &statp
->length
,
733 &statp
->name
, &statp
->uid
, &statp
->gid
,
734 &statp
->muid
, &statp
->extension
,
735 &statp
->n_uid
, &statp
->n_gid
,
740 V9fsIattr
*iattr
= va_arg(ap
, V9fsIattr
*);
741 offset
+= pdu_unmarshal(pdu
, offset
, "ddddqqqqq",
742 &iattr
->valid
, &iattr
->mode
,
743 &iattr
->uid
, &iattr
->gid
, &iattr
->size
,
744 &iattr
->atime_sec
, &iattr
->atime_nsec
,
745 &iattr
->mtime_sec
, &iattr
->mtime_nsec
);
755 return offset
- old_offset
;
758 static size_t pdu_marshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
760 size_t old_offset
= offset
;
765 for (i
= 0; fmt
[i
]; i
++) {
768 uint8_t val
= va_arg(ap
, int);
769 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
774 cpu_to_le16w(&val
, va_arg(ap
, int));
775 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
780 cpu_to_le32w(&val
, va_arg(ap
, uint32_t));
781 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
786 cpu_to_le64w(&val
, va_arg(ap
, uint64_t));
787 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
791 V9fsString
*str
= va_arg(ap
, V9fsString
*);
792 offset
+= pdu_marshal(pdu
, offset
, "w", str
->size
);
793 offset
+= pdu_pack(pdu
, offset
, str
->data
, str
->size
);
797 V9fsQID
*qidp
= va_arg(ap
, V9fsQID
*);
798 offset
+= pdu_marshal(pdu
, offset
, "bdq",
799 qidp
->type
, qidp
->version
, qidp
->path
);
803 V9fsStat
*statp
= va_arg(ap
, V9fsStat
*);
804 offset
+= pdu_marshal(pdu
, offset
, "wwdQdddqsssssddd",
805 statp
->size
, statp
->type
, statp
->dev
,
806 &statp
->qid
, statp
->mode
, statp
->atime
,
807 statp
->mtime
, statp
->length
, &statp
->name
,
808 &statp
->uid
, &statp
->gid
, &statp
->muid
,
809 &statp
->extension
, statp
->n_uid
,
810 statp
->n_gid
, statp
->n_muid
);
814 V9fsStatDotl
*statp
= va_arg(ap
, V9fsStatDotl
*);
815 offset
+= pdu_marshal(pdu
, offset
, "qQdddqqqqqqqqqqqqqqq",
816 statp
->st_result_mask
,
817 &statp
->qid
, statp
->st_mode
,
818 statp
->st_uid
, statp
->st_gid
,
819 statp
->st_nlink
, statp
->st_rdev
,
820 statp
->st_size
, statp
->st_blksize
, statp
->st_blocks
,
821 statp
->st_atime_sec
, statp
->st_atime_nsec
,
822 statp
->st_mtime_sec
, statp
->st_mtime_nsec
,
823 statp
->st_ctime_sec
, statp
->st_ctime_nsec
,
824 statp
->st_btime_sec
, statp
->st_btime_nsec
,
825 statp
->st_gen
, statp
->st_data_version
);
834 return offset
- old_offset
;
837 static void complete_pdu(V9fsState
*s
, V9fsPDU
*pdu
, ssize_t len
)
839 int8_t id
= pdu
->id
+ 1; /* Response */
845 if (s
->proto_version
!= V9FS_PROTO_2000L
) {
848 str
.data
= strerror(err
);
849 str
.size
= strlen(str
.data
);
851 len
+= pdu_marshal(pdu
, len
, "s", &str
);
855 len
+= pdu_marshal(pdu
, len
, "d", err
);
857 if (s
->proto_version
== V9FS_PROTO_2000L
) {
860 trace_v9fs_rerror(pdu
->tag
, pdu
->id
, err
); /* Trace ERROR */
863 /* fill out the header */
864 pdu_marshal(pdu
, 0, "dbw", (int32_t)len
, id
, pdu
->tag
);
866 /* keep these in sync */
870 /* push onto queue and notify */
871 virtqueue_push(s
->vq
, &pdu
->elem
, len
);
873 /* FIXME: we should batch these completions */
874 virtio_notify(&s
->vdev
, s
->vq
);
876 /* Now wakeup anybody waiting in flush for this request */
877 qemu_co_queue_next(&pdu
->complete
);
882 static mode_t
v9mode_to_mode(uint32_t mode
, V9fsString
*extension
)
887 if (mode
& P9_STAT_MODE_DIR
) {
891 if (mode
& P9_STAT_MODE_SYMLINK
) {
894 if (mode
& P9_STAT_MODE_SOCKET
) {
897 if (mode
& P9_STAT_MODE_NAMED_PIPE
) {
900 if (mode
& P9_STAT_MODE_DEVICE
) {
901 if (extension
&& extension
->data
[0] == 'c') {
912 if (mode
& P9_STAT_MODE_SETUID
) {
915 if (mode
& P9_STAT_MODE_SETGID
) {
918 if (mode
& P9_STAT_MODE_SETVTX
) {
925 static int donttouch_stat(V9fsStat
*stat
)
927 if (stat
->type
== -1 &&
929 stat
->qid
.type
== -1 &&
930 stat
->qid
.version
== -1 &&
931 stat
->qid
.path
== -1 &&
935 stat
->length
== -1 &&
942 stat
->n_muid
== -1) {
949 static void v9fs_stat_free(V9fsStat
*stat
)
951 v9fs_string_free(&stat
->name
);
952 v9fs_string_free(&stat
->uid
);
953 v9fs_string_free(&stat
->gid
);
954 v9fs_string_free(&stat
->muid
);
955 v9fs_string_free(&stat
->extension
);
958 static uint32_t stat_to_v9mode(const struct stat
*stbuf
)
962 mode
= stbuf
->st_mode
& 0777;
963 if (S_ISDIR(stbuf
->st_mode
)) {
964 mode
|= P9_STAT_MODE_DIR
;
967 if (S_ISLNK(stbuf
->st_mode
)) {
968 mode
|= P9_STAT_MODE_SYMLINK
;
971 if (S_ISSOCK(stbuf
->st_mode
)) {
972 mode
|= P9_STAT_MODE_SOCKET
;
975 if (S_ISFIFO(stbuf
->st_mode
)) {
976 mode
|= P9_STAT_MODE_NAMED_PIPE
;
979 if (S_ISBLK(stbuf
->st_mode
) || S_ISCHR(stbuf
->st_mode
)) {
980 mode
|= P9_STAT_MODE_DEVICE
;
983 if (stbuf
->st_mode
& S_ISUID
) {
984 mode
|= P9_STAT_MODE_SETUID
;
987 if (stbuf
->st_mode
& S_ISGID
) {
988 mode
|= P9_STAT_MODE_SETGID
;
991 if (stbuf
->st_mode
& S_ISVTX
) {
992 mode
|= P9_STAT_MODE_SETVTX
;
998 static int stat_to_v9stat(V9fsPDU
*pdu
, V9fsPath
*name
,
999 const struct stat
*stbuf
,
1005 memset(v9stat
, 0, sizeof(*v9stat
));
1007 stat_to_qid(stbuf
, &v9stat
->qid
);
1008 v9stat
->mode
= stat_to_v9mode(stbuf
);
1009 v9stat
->atime
= stbuf
->st_atime
;
1010 v9stat
->mtime
= stbuf
->st_mtime
;
1011 v9stat
->length
= stbuf
->st_size
;
1013 v9fs_string_null(&v9stat
->uid
);
1014 v9fs_string_null(&v9stat
->gid
);
1015 v9fs_string_null(&v9stat
->muid
);
1017 v9stat
->n_uid
= stbuf
->st_uid
;
1018 v9stat
->n_gid
= stbuf
->st_gid
;
1021 v9fs_string_null(&v9stat
->extension
);
1023 if (v9stat
->mode
& P9_STAT_MODE_SYMLINK
) {
1024 err
= v9fs_co_readlink(pdu
, name
, &v9stat
->extension
);
1028 } else if (v9stat
->mode
& P9_STAT_MODE_DEVICE
) {
1029 v9fs_string_sprintf(&v9stat
->extension
, "%c %u %u",
1030 S_ISCHR(stbuf
->st_mode
) ? 'c' : 'b',
1031 major(stbuf
->st_rdev
), minor(stbuf
->st_rdev
));
1032 } else if (S_ISDIR(stbuf
->st_mode
) || S_ISREG(stbuf
->st_mode
)) {
1033 v9fs_string_sprintf(&v9stat
->extension
, "%s %lu",
1034 "HARDLINKCOUNT", (unsigned long)stbuf
->st_nlink
);
1037 str
= strrchr(name
->data
, '/');
1044 v9fs_string_sprintf(&v9stat
->name
, "%s", str
);
1047 v9fs_string_size(&v9stat
->name
) +
1048 v9fs_string_size(&v9stat
->uid
) +
1049 v9fs_string_size(&v9stat
->gid
) +
1050 v9fs_string_size(&v9stat
->muid
) +
1051 v9fs_string_size(&v9stat
->extension
);
1055 #define P9_STATS_MODE 0x00000001ULL
1056 #define P9_STATS_NLINK 0x00000002ULL
1057 #define P9_STATS_UID 0x00000004ULL
1058 #define P9_STATS_GID 0x00000008ULL
1059 #define P9_STATS_RDEV 0x00000010ULL
1060 #define P9_STATS_ATIME 0x00000020ULL
1061 #define P9_STATS_MTIME 0x00000040ULL
1062 #define P9_STATS_CTIME 0x00000080ULL
1063 #define P9_STATS_INO 0x00000100ULL
1064 #define P9_STATS_SIZE 0x00000200ULL
1065 #define P9_STATS_BLOCKS 0x00000400ULL
1067 #define P9_STATS_BTIME 0x00000800ULL
1068 #define P9_STATS_GEN 0x00001000ULL
1069 #define P9_STATS_DATA_VERSION 0x00002000ULL
1071 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
1072 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
1075 static void stat_to_v9stat_dotl(V9fsState
*s
, const struct stat
*stbuf
,
1076 V9fsStatDotl
*v9lstat
)
1078 memset(v9lstat
, 0, sizeof(*v9lstat
));
1080 v9lstat
->st_mode
= stbuf
->st_mode
;
1081 v9lstat
->st_nlink
= stbuf
->st_nlink
;
1082 v9lstat
->st_uid
= stbuf
->st_uid
;
1083 v9lstat
->st_gid
= stbuf
->st_gid
;
1084 v9lstat
->st_rdev
= stbuf
->st_rdev
;
1085 v9lstat
->st_size
= stbuf
->st_size
;
1086 v9lstat
->st_blksize
= stbuf
->st_blksize
;
1087 v9lstat
->st_blocks
= stbuf
->st_blocks
;
1088 v9lstat
->st_atime_sec
= stbuf
->st_atime
;
1089 v9lstat
->st_atime_nsec
= stbuf
->st_atim
.tv_nsec
;
1090 v9lstat
->st_mtime_sec
= stbuf
->st_mtime
;
1091 v9lstat
->st_mtime_nsec
= stbuf
->st_mtim
.tv_nsec
;
1092 v9lstat
->st_ctime_sec
= stbuf
->st_ctime
;
1093 v9lstat
->st_ctime_nsec
= stbuf
->st_ctim
.tv_nsec
;
1094 /* Currently we only support BASIC fields in stat */
1095 v9lstat
->st_result_mask
= P9_STATS_BASIC
;
1097 stat_to_qid(stbuf
, &v9lstat
->qid
);
1100 static void print_sg(struct iovec
*sg
, int cnt
)
1104 printf("sg[%d]: {", cnt
);
1105 for (i
= 0; i
< cnt
; i
++) {
1109 printf("(%p, %zd)", sg
[i
].iov_base
, sg
[i
].iov_len
);
1114 /* Will call this only for path name based fid */
1115 static void v9fs_fix_path(V9fsPath
*dst
, V9fsPath
*src
, int len
)
1118 v9fs_path_init(&str
);
1119 v9fs_path_copy(&str
, dst
);
1120 v9fs_string_sprintf((V9fsString
*)dst
, "%s%s", src
->data
, str
.data
+len
);
1121 v9fs_path_free(&str
);
1122 /* +1 to include terminating NULL */
1126 static inline bool is_ro_export(FsContext
*ctx
)
1128 return ctx
->export_flags
& V9FS_RDONLY
;
1131 static void v9fs_version(void *opaque
)
1133 V9fsPDU
*pdu
= opaque
;
1134 V9fsState
*s
= pdu
->s
;
1138 pdu_unmarshal(pdu
, offset
, "ds", &s
->msize
, &version
);
1139 trace_v9fs_version(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
1143 if (!strcmp(version
.data
, "9P2000.u")) {
1144 s
->proto_version
= V9FS_PROTO_2000U
;
1145 } else if (!strcmp(version
.data
, "9P2000.L")) {
1146 s
->proto_version
= V9FS_PROTO_2000L
;
1148 v9fs_string_sprintf(&version
, "unknown");
1151 offset
+= pdu_marshal(pdu
, offset
, "ds", s
->msize
, &version
);
1152 trace_v9fs_version_return(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
1154 complete_pdu(s
, pdu
, offset
);
1156 v9fs_string_free(&version
);
1160 static void v9fs_attach(void *opaque
)
1162 V9fsPDU
*pdu
= opaque
;
1163 V9fsState
*s
= pdu
->s
;
1164 int32_t fid
, afid
, n_uname
;
1165 V9fsString uname
, aname
;
1171 pdu_unmarshal(pdu
, offset
, "ddssd", &fid
, &afid
, &uname
, &aname
, &n_uname
);
1172 trace_v9fs_attach(pdu
->tag
, pdu
->id
, fid
, afid
, uname
.data
, aname
.data
);
1174 fidp
= alloc_fid(s
, fid
);
1179 fidp
->uid
= n_uname
;
1180 err
= v9fs_co_name_to_path(pdu
, NULL
, "/", &fidp
->path
);
1186 err
= fid_to_qid(pdu
, fidp
, &qid
);
1192 offset
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
1194 trace_v9fs_attach_return(pdu
->tag
, pdu
->id
,
1195 qid
.type
, qid
.version
, qid
.path
);
1197 /* disable migration */
1198 error_set(&s
->migration_blocker
, QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION
,
1199 s
->ctx
.fs_root
, s
->tag
);
1200 migrate_add_blocker(s
->migration_blocker
);
1204 complete_pdu(s
, pdu
, err
);
1205 v9fs_string_free(&uname
);
1206 v9fs_string_free(&aname
);
1209 static void v9fs_stat(void *opaque
)
1217 V9fsPDU
*pdu
= opaque
;
1218 V9fsState
*s
= pdu
->s
;
1220 pdu_unmarshal(pdu
, offset
, "d", &fid
);
1221 trace_v9fs_stat(pdu
->tag
, pdu
->id
, fid
);
1223 fidp
= get_fid(pdu
, fid
);
1228 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1232 err
= stat_to_v9stat(pdu
, &fidp
->path
, &stbuf
, &v9stat
);
1236 offset
+= pdu_marshal(pdu
, offset
, "wS", 0, &v9stat
);
1238 trace_v9fs_stat_return(pdu
->tag
, pdu
->id
, v9stat
.mode
,
1239 v9stat
.atime
, v9stat
.mtime
, v9stat
.length
);
1240 v9fs_stat_free(&v9stat
);
1244 complete_pdu(s
, pdu
, err
);
1247 static void v9fs_getattr(void *opaque
)
1254 uint64_t request_mask
;
1255 V9fsStatDotl v9stat_dotl
;
1256 V9fsPDU
*pdu
= opaque
;
1257 V9fsState
*s
= pdu
->s
;
1259 pdu_unmarshal(pdu
, offset
, "dq", &fid
, &request_mask
);
1260 trace_v9fs_getattr(pdu
->tag
, pdu
->id
, fid
, request_mask
);
1262 fidp
= get_fid(pdu
, fid
);
1268 * Currently we only support BASIC fields in stat, so there is no
1269 * need to look at request_mask.
1271 retval
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1275 stat_to_v9stat_dotl(s
, &stbuf
, &v9stat_dotl
);
1277 /* fill st_gen if requested and supported by underlying fs */
1278 if (request_mask
& P9_STATS_GEN
) {
1279 retval
= v9fs_co_st_gen(pdu
, &fidp
->path
, stbuf
.st_mode
, &v9stat_dotl
);
1283 v9stat_dotl
.st_result_mask
|= P9_STATS_GEN
;
1286 retval
+= pdu_marshal(pdu
, offset
, "A", &v9stat_dotl
);
1287 trace_v9fs_getattr_return(pdu
->tag
, pdu
->id
, v9stat_dotl
.st_result_mask
,
1288 v9stat_dotl
.st_mode
, v9stat_dotl
.st_uid
,
1289 v9stat_dotl
.st_gid
);
1293 complete_pdu(s
, pdu
, retval
);
1296 /* Attribute flags */
1297 #define P9_ATTR_MODE (1 << 0)
1298 #define P9_ATTR_UID (1 << 1)
1299 #define P9_ATTR_GID (1 << 2)
1300 #define P9_ATTR_SIZE (1 << 3)
1301 #define P9_ATTR_ATIME (1 << 4)
1302 #define P9_ATTR_MTIME (1 << 5)
1303 #define P9_ATTR_CTIME (1 << 6)
1304 #define P9_ATTR_ATIME_SET (1 << 7)
1305 #define P9_ATTR_MTIME_SET (1 << 8)
1307 #define P9_ATTR_MASK 127
1309 static void v9fs_setattr(void *opaque
)
1316 V9fsPDU
*pdu
= opaque
;
1317 V9fsState
*s
= pdu
->s
;
1319 pdu_unmarshal(pdu
, offset
, "dI", &fid
, &v9iattr
);
1321 fidp
= get_fid(pdu
, fid
);
1326 if (v9iattr
.valid
& P9_ATTR_MODE
) {
1327 err
= v9fs_co_chmod(pdu
, &fidp
->path
, v9iattr
.mode
);
1332 if (v9iattr
.valid
& (P9_ATTR_ATIME
| P9_ATTR_MTIME
)) {
1333 struct timespec times
[2];
1334 if (v9iattr
.valid
& P9_ATTR_ATIME
) {
1335 if (v9iattr
.valid
& P9_ATTR_ATIME_SET
) {
1336 times
[0].tv_sec
= v9iattr
.atime_sec
;
1337 times
[0].tv_nsec
= v9iattr
.atime_nsec
;
1339 times
[0].tv_nsec
= UTIME_NOW
;
1342 times
[0].tv_nsec
= UTIME_OMIT
;
1344 if (v9iattr
.valid
& P9_ATTR_MTIME
) {
1345 if (v9iattr
.valid
& P9_ATTR_MTIME_SET
) {
1346 times
[1].tv_sec
= v9iattr
.mtime_sec
;
1347 times
[1].tv_nsec
= v9iattr
.mtime_nsec
;
1349 times
[1].tv_nsec
= UTIME_NOW
;
1352 times
[1].tv_nsec
= UTIME_OMIT
;
1354 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
1360 * If the only valid entry in iattr is ctime we can call
1361 * chown(-1,-1) to update the ctime of the file
1363 if ((v9iattr
.valid
& (P9_ATTR_UID
| P9_ATTR_GID
)) ||
1364 ((v9iattr
.valid
& P9_ATTR_CTIME
)
1365 && !((v9iattr
.valid
& P9_ATTR_MASK
) & ~P9_ATTR_CTIME
))) {
1366 if (!(v9iattr
.valid
& P9_ATTR_UID
)) {
1369 if (!(v9iattr
.valid
& P9_ATTR_GID
)) {
1372 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9iattr
.uid
,
1378 if (v9iattr
.valid
& (P9_ATTR_SIZE
)) {
1379 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9iattr
.size
);
1388 complete_pdu(s
, pdu
, err
);
1391 static int v9fs_walk_marshal(V9fsPDU
*pdu
, uint16_t nwnames
, V9fsQID
*qids
)
1395 offset
+= pdu_marshal(pdu
, offset
, "w", nwnames
);
1396 for (i
= 0; i
< nwnames
; i
++) {
1397 offset
+= pdu_marshal(pdu
, offset
, "Q", &qids
[i
]);
1402 static void v9fs_walk(void *opaque
)
1405 V9fsQID
*qids
= NULL
;
1407 V9fsPath dpath
, path
;
1411 int32_t fid
, newfid
;
1412 V9fsString
*wnames
= NULL
;
1414 V9fsFidState
*newfidp
= NULL
;
1415 V9fsPDU
*pdu
= opaque
;
1416 V9fsState
*s
= pdu
->s
;
1418 offset
+= pdu_unmarshal(pdu
, offset
, "ddw", &fid
,
1421 trace_v9fs_walk(pdu
->tag
, pdu
->id
, fid
, newfid
, nwnames
);
1423 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1424 wnames
= g_malloc0(sizeof(wnames
[0]) * nwnames
);
1425 qids
= g_malloc0(sizeof(qids
[0]) * nwnames
);
1426 for (i
= 0; i
< nwnames
; i
++) {
1427 offset
+= pdu_unmarshal(pdu
, offset
, "s", &wnames
[i
]);
1429 } else if (nwnames
> P9_MAXWELEM
) {
1433 fidp
= get_fid(pdu
, fid
);
1438 v9fs_path_init(&dpath
);
1439 v9fs_path_init(&path
);
1441 * Both dpath and path initially poin to fidp.
1442 * Needed to handle request with nwnames == 0
1444 v9fs_path_copy(&dpath
, &fidp
->path
);
1445 v9fs_path_copy(&path
, &fidp
->path
);
1446 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1447 err
= v9fs_co_name_to_path(pdu
, &dpath
, wnames
[name_idx
].data
, &path
);
1451 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1455 stat_to_qid(&stbuf
, &qids
[name_idx
]);
1456 v9fs_path_copy(&dpath
, &path
);
1458 if (fid
== newfid
) {
1459 BUG_ON(fidp
->fid_type
!= P9_FID_NONE
);
1460 v9fs_path_copy(&fidp
->path
, &path
);
1462 newfidp
= alloc_fid(s
, newfid
);
1463 if (newfidp
== NULL
) {
1467 newfidp
->uid
= fidp
->uid
;
1468 v9fs_path_copy(&newfidp
->path
, &path
);
1470 err
= v9fs_walk_marshal(pdu
, nwnames
, qids
);
1471 trace_v9fs_walk_return(pdu
->tag
, pdu
->id
, nwnames
, qids
);
1475 put_fid(pdu
, newfidp
);
1477 v9fs_path_free(&dpath
);
1478 v9fs_path_free(&path
);
1480 complete_pdu(s
, pdu
, err
);
1481 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1482 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1483 v9fs_string_free(&wnames
[name_idx
]);
1491 static int32_t get_iounit(V9fsPDU
*pdu
, V9fsPath
*path
)
1493 struct statfs stbuf
;
1495 V9fsState
*s
= pdu
->s
;
1498 * iounit should be multiples of f_bsize (host filesystem block size
1499 * and as well as less than (client msize - P9_IOHDRSZ))
1501 if (!v9fs_co_statfs(pdu
, path
, &stbuf
)) {
1502 iounit
= stbuf
.f_bsize
;
1503 iounit
*= (s
->msize
- P9_IOHDRSZ
)/stbuf
.f_bsize
;
1506 iounit
= s
->msize
- P9_IOHDRSZ
;
1511 static void v9fs_open(void *opaque
)
1522 V9fsPDU
*pdu
= opaque
;
1523 V9fsState
*s
= pdu
->s
;
1525 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1526 pdu_unmarshal(pdu
, offset
, "dd", &fid
, &mode
);
1528 pdu_unmarshal(pdu
, offset
, "db", &fid
, &mode
);
1530 trace_v9fs_open(pdu
->tag
, pdu
->id
, fid
, mode
);
1532 fidp
= get_fid(pdu
, fid
);
1537 BUG_ON(fidp
->fid_type
!= P9_FID_NONE
);
1539 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1543 stat_to_qid(&stbuf
, &qid
);
1544 if (S_ISDIR(stbuf
.st_mode
)) {
1545 err
= v9fs_co_opendir(pdu
, fidp
);
1549 fidp
->fid_type
= P9_FID_DIR
;
1550 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, 0);
1553 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1554 flags
= get_dotl_openflags(s
, mode
);
1556 flags
= omode_to_uflags(mode
);
1558 if (is_ro_export(&s
->ctx
)) {
1559 if (mode
& O_WRONLY
|| mode
& O_RDWR
||
1560 mode
& O_APPEND
|| mode
& O_TRUNC
) {
1566 err
= v9fs_co_open(pdu
, fidp
, flags
);
1570 fidp
->fid_type
= P9_FID_FILE
;
1571 fidp
->open_flags
= flags
;
1572 if (flags
& O_EXCL
) {
1574 * We let the host file system do O_EXCL check
1575 * We should not reclaim such fd
1577 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1579 iounit
= get_iounit(pdu
, &fidp
->path
);
1580 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1583 trace_v9fs_open_return(pdu
->tag
, pdu
->id
,
1584 qid
.type
, qid
.version
, qid
.path
, iounit
);
1588 complete_pdu(s
, pdu
, err
);
1591 static void v9fs_lcreate(void *opaque
)
1593 int32_t dfid
, flags
, mode
;
1602 V9fsPDU
*pdu
= opaque
;
1604 pdu_unmarshal(pdu
, offset
, "dsddd", &dfid
, &name
, &flags
,
1606 trace_v9fs_lcreate(pdu
->tag
, pdu
->id
, dfid
, flags
, mode
, gid
);
1608 fidp
= get_fid(pdu
, dfid
);
1614 flags
= get_dotl_openflags(pdu
->s
, flags
);
1615 err
= v9fs_co_open2(pdu
, fidp
, &name
, gid
,
1616 flags
| O_CREAT
, mode
, &stbuf
);
1620 fidp
->fid_type
= P9_FID_FILE
;
1621 fidp
->open_flags
= flags
;
1622 if (flags
& O_EXCL
) {
1624 * We let the host file system do O_EXCL check
1625 * We should not reclaim such fd
1627 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1629 iounit
= get_iounit(pdu
, &fidp
->path
);
1630 stat_to_qid(&stbuf
, &qid
);
1631 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1633 trace_v9fs_lcreate_return(pdu
->tag
, pdu
->id
,
1634 qid
.type
, qid
.version
, qid
.path
, iounit
);
1638 complete_pdu(pdu
->s
, pdu
, err
);
1639 v9fs_string_free(&name
);
1642 static void v9fs_fsync(void *opaque
)
1649 V9fsPDU
*pdu
= opaque
;
1650 V9fsState
*s
= pdu
->s
;
1652 pdu_unmarshal(pdu
, offset
, "dd", &fid
, &datasync
);
1653 trace_v9fs_fsync(pdu
->tag
, pdu
->id
, fid
, datasync
);
1655 fidp
= get_fid(pdu
, fid
);
1660 err
= v9fs_co_fsync(pdu
, fidp
, datasync
);
1666 complete_pdu(s
, pdu
, err
);
1669 static void v9fs_clunk(void *opaque
)
1675 V9fsPDU
*pdu
= opaque
;
1676 V9fsState
*s
= pdu
->s
;
1678 pdu_unmarshal(pdu
, offset
, "d", &fid
);
1679 trace_v9fs_clunk(pdu
->tag
, pdu
->id
, fid
);
1681 fidp
= clunk_fid(s
, fid
);
1687 * Bump the ref so that put_fid will
1695 complete_pdu(s
, pdu
, err
);
1698 static int v9fs_xattr_read(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
1699 uint64_t off
, uint32_t max_count
)
1705 xattr_len
= fidp
->fs
.xattr
.len
;
1706 read_count
= xattr_len
- off
;
1707 if (read_count
> max_count
) {
1708 read_count
= max_count
;
1709 } else if (read_count
< 0) {
1711 * read beyond XATTR value
1715 offset
+= pdu_marshal(pdu
, offset
, "d", read_count
);
1716 offset
+= pdu_pack(pdu
, offset
,
1717 ((char *)fidp
->fs
.xattr
.value
) + off
,
1722 static int v9fs_do_readdir_with_stat(V9fsPDU
*pdu
,
1723 V9fsFidState
*fidp
, uint32_t max_count
)
1730 off_t saved_dir_pos
;
1731 struct dirent
*dent
, *result
;
1733 /* save the directory position */
1734 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1735 if (saved_dir_pos
< 0) {
1736 return saved_dir_pos
;
1739 dent
= g_malloc(sizeof(struct dirent
));
1742 v9fs_path_init(&path
);
1743 err
= v9fs_co_readdir_r(pdu
, fidp
, dent
, &result
);
1744 if (err
|| !result
) {
1747 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, dent
->d_name
, &path
);
1751 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1755 err
= stat_to_v9stat(pdu
, &path
, &stbuf
, &v9stat
);
1759 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1760 len
= pdu_marshal(pdu
, 11 + count
, "S", &v9stat
);
1761 if ((len
!= (v9stat
.size
+ 2)) || ((count
+ len
) > max_count
)) {
1762 /* Ran out of buffer. Set dir back to old position and return */
1763 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1764 v9fs_stat_free(&v9stat
);
1765 v9fs_path_free(&path
);
1770 v9fs_stat_free(&v9stat
);
1771 v9fs_path_free(&path
);
1772 saved_dir_pos
= dent
->d_off
;
1776 v9fs_path_free(&path
);
1784 * Create a QEMUIOVector for a sub-region of PDU iovecs
1786 * @qiov: uninitialized QEMUIOVector
1787 * @skip: number of bytes to skip from beginning of PDU
1788 * @size: number of bytes to include
1789 * @is_write: true - write, false - read
1791 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
1792 * with qemu_iovec_destroy().
1794 static void v9fs_init_qiov_from_pdu(QEMUIOVector
*qiov
, V9fsPDU
*pdu
,
1795 uint64_t skip
, size_t size
,
1803 iov
= pdu
->elem
.out_sg
;
1804 niov
= pdu
->elem
.out_num
;
1806 iov
= pdu
->elem
.in_sg
;
1807 niov
= pdu
->elem
.in_num
;
1810 qemu_iovec_init_external(&elem
, iov
, niov
);
1811 qemu_iovec_init(qiov
, niov
);
1812 qemu_iovec_copy(qiov
, &elem
, skip
, size
);
1815 static void v9fs_read(void *opaque
)
1824 V9fsPDU
*pdu
= opaque
;
1825 V9fsState
*s
= pdu
->s
;
1827 pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &max_count
);
1828 trace_v9fs_read(pdu
->tag
, pdu
->id
, fid
, off
, max_count
);
1830 fidp
= get_fid(pdu
, fid
);
1835 if (fidp
->fid_type
== P9_FID_DIR
) {
1838 v9fs_co_rewinddir(pdu
, fidp
);
1840 count
= v9fs_do_readdir_with_stat(pdu
, fidp
, max_count
);
1846 err
+= pdu_marshal(pdu
, offset
, "d", count
);
1848 } else if (fidp
->fid_type
== P9_FID_FILE
) {
1849 QEMUIOVector qiov_full
;
1853 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
+ 4, max_count
, false);
1854 qemu_iovec_init(&qiov
, qiov_full
.niov
);
1856 qemu_iovec_reset(&qiov
);
1857 qemu_iovec_copy(&qiov
, &qiov_full
, count
, qiov_full
.size
- count
);
1859 print_sg(qiov
.iov
, qiov
.niov
);
1861 /* Loop in case of EINTR */
1863 len
= v9fs_co_preadv(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
1868 } while (len
== -EINTR
&& !pdu
->cancelled
);
1870 /* IO error return the error */
1874 } while (count
< max_count
&& len
> 0);
1876 err
+= pdu_marshal(pdu
, offset
, "d", count
);
1878 qemu_iovec_destroy(&qiov
);
1879 qemu_iovec_destroy(&qiov_full
);
1880 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
1881 err
= v9fs_xattr_read(s
, pdu
, fidp
, off
, max_count
);
1885 trace_v9fs_read_return(pdu
->tag
, pdu
->id
, count
, err
);
1889 complete_pdu(s
, pdu
, err
);
1892 static size_t v9fs_readdir_data_size(V9fsString
*name
)
1895 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1896 * size of type (1) + size of name.size (2) + strlen(name.data)
1898 return 24 + v9fs_string_size(name
);
1901 static int v9fs_do_readdir(V9fsPDU
*pdu
,
1902 V9fsFidState
*fidp
, int32_t max_count
)
1909 off_t saved_dir_pos
;
1910 struct dirent
*dent
, *result
;
1912 /* save the directory position */
1913 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1914 if (saved_dir_pos
< 0) {
1915 return saved_dir_pos
;
1918 dent
= g_malloc(sizeof(struct dirent
));
1921 err
= v9fs_co_readdir_r(pdu
, fidp
, dent
, &result
);
1922 if (err
|| !result
) {
1925 v9fs_string_init(&name
);
1926 v9fs_string_sprintf(&name
, "%s", dent
->d_name
);
1927 if ((count
+ v9fs_readdir_data_size(&name
)) > max_count
) {
1928 /* Ran out of buffer. Set dir back to old position and return */
1929 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1930 v9fs_string_free(&name
);
1935 * Fill up just the path field of qid because the client uses
1936 * only that. To fill the entire qid structure we will have
1937 * to stat each dirent found, which is expensive
1939 size
= MIN(sizeof(dent
->d_ino
), sizeof(qid
.path
));
1940 memcpy(&qid
.path
, &dent
->d_ino
, size
);
1941 /* Fill the other fields with dummy values */
1945 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1946 len
= pdu_marshal(pdu
, 11 + count
, "Qqbs",
1948 dent
->d_type
, &name
);
1950 v9fs_string_free(&name
);
1951 saved_dir_pos
= dent
->d_off
;
1960 static void v9fs_readdir(void *opaque
)
1966 uint64_t initial_offset
;
1969 V9fsPDU
*pdu
= opaque
;
1970 V9fsState
*s
= pdu
->s
;
1972 pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &initial_offset
, &max_count
);
1974 trace_v9fs_readdir(pdu
->tag
, pdu
->id
, fid
, initial_offset
, max_count
);
1976 fidp
= get_fid(pdu
, fid
);
1981 if (!fidp
->fs
.dir
) {
1985 if (initial_offset
== 0) {
1986 v9fs_co_rewinddir(pdu
, fidp
);
1988 v9fs_co_seekdir(pdu
, fidp
, initial_offset
);
1990 count
= v9fs_do_readdir(pdu
, fidp
, max_count
);
1996 retval
+= pdu_marshal(pdu
, offset
, "d", count
);
1998 trace_v9fs_readdir_return(pdu
->tag
, pdu
->id
, count
, retval
);
2002 complete_pdu(s
, pdu
, retval
);
2005 static int v9fs_xattr_write(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2006 uint64_t off
, uint32_t count
,
2007 struct iovec
*sg
, int cnt
)
2016 xattr_len
= fidp
->fs
.xattr
.len
;
2017 write_count
= xattr_len
- off
;
2018 if (write_count
> count
) {
2019 write_count
= count
;
2020 } else if (write_count
< 0) {
2022 * write beyond XATTR value len specified in
2028 offset
+= pdu_marshal(pdu
, offset
, "d", write_count
);
2030 fidp
->fs
.xattr
.copied_len
+= write_count
;
2032 * Now copy the content from sg list
2034 for (i
= 0; i
< cnt
; i
++) {
2035 if (write_count
> sg
[i
].iov_len
) {
2036 to_copy
= sg
[i
].iov_len
;
2038 to_copy
= write_count
;
2040 memcpy((char *)fidp
->fs
.xattr
.value
+ off
, sg
[i
].iov_base
, to_copy
);
2041 /* updating vs->off since we are not using below */
2043 write_count
-= to_copy
;
2049 static void v9fs_write(void *opaque
)
2059 V9fsPDU
*pdu
= opaque
;
2060 V9fsState
*s
= pdu
->s
;
2061 QEMUIOVector qiov_full
;
2064 offset
+= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &count
);
2065 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, count
, true);
2066 trace_v9fs_write(pdu
->tag
, pdu
->id
, fid
, off
, count
, qiov_full
.niov
);
2068 fidp
= get_fid(pdu
, fid
);
2073 if (fidp
->fid_type
== P9_FID_FILE
) {
2074 if (fidp
->fs
.fd
== -1) {
2078 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
2080 * setxattr operation
2082 err
= v9fs_xattr_write(s
, pdu
, fidp
, off
, count
,
2083 qiov_full
.iov
, qiov_full
.niov
);
2089 qemu_iovec_init(&qiov
, qiov_full
.niov
);
2091 qemu_iovec_reset(&qiov
);
2092 qemu_iovec_copy(&qiov
, &qiov_full
, total
, qiov_full
.size
- total
);
2094 print_sg(qiov
.iov
, qiov
.niov
);
2096 /* Loop in case of EINTR */
2098 len
= v9fs_co_pwritev(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
2103 } while (len
== -EINTR
&& !pdu
->cancelled
);
2105 /* IO error return the error */
2109 } while (total
< count
&& len
> 0);
2112 offset
+= pdu_marshal(pdu
, offset
, "d", total
);
2114 trace_v9fs_write_return(pdu
->tag
, pdu
->id
, total
, err
);
2116 qemu_iovec_destroy(&qiov
);
2120 qemu_iovec_destroy(&qiov_full
);
2121 complete_pdu(s
, pdu
, err
);
2124 static void v9fs_create(void *opaque
)
2136 V9fsString extension
;
2138 V9fsPDU
*pdu
= opaque
;
2140 v9fs_path_init(&path
);
2142 pdu_unmarshal(pdu
, offset
, "dsdbs", &fid
, &name
,
2143 &perm
, &mode
, &extension
);
2145 trace_v9fs_create(pdu
->tag
, pdu
->id
, fid
, name
.data
, perm
, mode
);
2147 fidp
= get_fid(pdu
, fid
);
2152 if (perm
& P9_STAT_MODE_DIR
) {
2153 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, perm
& 0777,
2154 fidp
->uid
, -1, &stbuf
);
2158 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2162 v9fs_path_copy(&fidp
->path
, &path
);
2163 err
= v9fs_co_opendir(pdu
, fidp
);
2167 fidp
->fid_type
= P9_FID_DIR
;
2168 } else if (perm
& P9_STAT_MODE_SYMLINK
) {
2169 err
= v9fs_co_symlink(pdu
, fidp
, &name
,
2170 extension
.data
, -1 , &stbuf
);
2174 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2178 v9fs_path_copy(&fidp
->path
, &path
);
2179 } else if (perm
& P9_STAT_MODE_LINK
) {
2180 int32_t ofid
= atoi(extension
.data
);
2181 V9fsFidState
*ofidp
= get_fid(pdu
, ofid
);
2182 if (ofidp
== NULL
) {
2186 err
= v9fs_co_link(pdu
, ofidp
, fidp
, &name
);
2187 put_fid(pdu
, ofidp
);
2191 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2193 fidp
->fid_type
= P9_FID_NONE
;
2196 v9fs_path_copy(&fidp
->path
, &path
);
2197 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2199 fidp
->fid_type
= P9_FID_NONE
;
2202 } else if (perm
& P9_STAT_MODE_DEVICE
) {
2204 uint32_t major
, minor
;
2207 if (sscanf(extension
.data
, "%c %u %u", &ctype
, &major
, &minor
) != 3) {
2224 nmode
|= perm
& 0777;
2225 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2226 makedev(major
, minor
), nmode
, &stbuf
);
2230 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2234 v9fs_path_copy(&fidp
->path
, &path
);
2235 } else if (perm
& P9_STAT_MODE_NAMED_PIPE
) {
2236 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2237 0, S_IFIFO
| (perm
& 0777), &stbuf
);
2241 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2245 v9fs_path_copy(&fidp
->path
, &path
);
2246 } else if (perm
& P9_STAT_MODE_SOCKET
) {
2247 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2248 0, S_IFSOCK
| (perm
& 0777), &stbuf
);
2252 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2256 v9fs_path_copy(&fidp
->path
, &path
);
2258 err
= v9fs_co_open2(pdu
, fidp
, &name
, -1,
2259 omode_to_uflags(mode
)|O_CREAT
, perm
, &stbuf
);
2263 fidp
->fid_type
= P9_FID_FILE
;
2264 fidp
->open_flags
= omode_to_uflags(mode
);
2265 if (fidp
->open_flags
& O_EXCL
) {
2267 * We let the host file system do O_EXCL check
2268 * We should not reclaim such fd
2270 fidp
->flags
|= FID_NON_RECLAIMABLE
;
2273 iounit
= get_iounit(pdu
, &fidp
->path
);
2274 stat_to_qid(&stbuf
, &qid
);
2275 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
2277 trace_v9fs_create_return(pdu
->tag
, pdu
->id
,
2278 qid
.type
, qid
.version
, qid
.path
, iounit
);
2282 complete_pdu(pdu
->s
, pdu
, err
);
2283 v9fs_string_free(&name
);
2284 v9fs_string_free(&extension
);
2285 v9fs_path_free(&path
);
2288 static void v9fs_symlink(void *opaque
)
2290 V9fsPDU
*pdu
= opaque
;
2293 V9fsFidState
*dfidp
;
2301 pdu_unmarshal(pdu
, offset
, "dssd", &dfid
, &name
, &symname
, &gid
);
2302 trace_v9fs_symlink(pdu
->tag
, pdu
->id
, dfid
, name
.data
, symname
.data
, gid
);
2304 dfidp
= get_fid(pdu
, dfid
);
2305 if (dfidp
== NULL
) {
2309 err
= v9fs_co_symlink(pdu
, dfidp
, &name
, symname
.data
, gid
, &stbuf
);
2313 stat_to_qid(&stbuf
, &qid
);
2314 offset
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
2316 trace_v9fs_symlink_return(pdu
->tag
, pdu
->id
,
2317 qid
.type
, qid
.version
, qid
.path
);
2319 put_fid(pdu
, dfidp
);
2321 complete_pdu(pdu
->s
, pdu
, err
);
2322 v9fs_string_free(&name
);
2323 v9fs_string_free(&symname
);
2326 static void v9fs_flush(void *opaque
)
2330 V9fsPDU
*cancel_pdu
;
2331 V9fsPDU
*pdu
= opaque
;
2332 V9fsState
*s
= pdu
->s
;
2334 pdu_unmarshal(pdu
, offset
, "w", &tag
);
2335 trace_v9fs_flush(pdu
->tag
, pdu
->id
, tag
);
2337 QLIST_FOREACH(cancel_pdu
, &s
->active_list
, next
) {
2338 if (cancel_pdu
->tag
== tag
) {
2343 cancel_pdu
->cancelled
= 1;
2345 * Wait for pdu to complete.
2347 qemu_co_queue_wait(&cancel_pdu
->complete
);
2348 cancel_pdu
->cancelled
= 0;
2349 free_pdu(pdu
->s
, cancel_pdu
);
2351 complete_pdu(s
, pdu
, 7);
2355 static void v9fs_link(void *opaque
)
2357 V9fsPDU
*pdu
= opaque
;
2358 V9fsState
*s
= pdu
->s
;
2359 int32_t dfid
, oldfid
;
2360 V9fsFidState
*dfidp
, *oldfidp
;
2365 pdu_unmarshal(pdu
, offset
, "dds", &dfid
, &oldfid
, &name
);
2366 trace_v9fs_link(pdu
->tag
, pdu
->id
, dfid
, oldfid
, name
.data
);
2368 dfidp
= get_fid(pdu
, dfid
);
2369 if (dfidp
== NULL
) {
2374 oldfidp
= get_fid(pdu
, oldfid
);
2375 if (oldfidp
== NULL
) {
2379 err
= v9fs_co_link(pdu
, oldfidp
, dfidp
, &name
);
2384 put_fid(pdu
, dfidp
);
2386 v9fs_string_free(&name
);
2387 complete_pdu(s
, pdu
, err
);
2390 /* Only works with path name based fid */
2391 static void v9fs_remove(void *opaque
)
2397 V9fsPDU
*pdu
= opaque
;
2399 pdu_unmarshal(pdu
, offset
, "d", &fid
);
2400 trace_v9fs_remove(pdu
->tag
, pdu
->id
, fid
);
2402 fidp
= get_fid(pdu
, fid
);
2407 /* if fs driver is not path based, return EOPNOTSUPP */
2408 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2413 * IF the file is unlinked, we cannot reopen
2414 * the file later. So don't reclaim fd
2416 err
= v9fs_mark_fids_unreclaim(pdu
, &fidp
->path
);
2420 err
= v9fs_co_remove(pdu
, &fidp
->path
);
2425 /* For TREMOVE we need to clunk the fid even on failed remove */
2426 clunk_fid(pdu
->s
, fidp
->fid
);
2429 complete_pdu(pdu
->s
, pdu
, err
);
2432 static void v9fs_unlinkat(void *opaque
)
2436 int32_t dfid
, flags
;
2439 V9fsFidState
*dfidp
;
2440 V9fsPDU
*pdu
= opaque
;
2442 pdu_unmarshal(pdu
, offset
, "dsd", &dfid
, &name
, &flags
);
2444 dfidp
= get_fid(pdu
, dfid
);
2445 if (dfidp
== NULL
) {
2450 * IF the file is unlinked, we cannot reopen
2451 * the file later. So don't reclaim fd
2453 v9fs_path_init(&path
);
2454 err
= v9fs_co_name_to_path(pdu
, &dfidp
->path
, name
.data
, &path
);
2458 err
= v9fs_mark_fids_unreclaim(pdu
, &path
);
2462 err
= v9fs_co_unlinkat(pdu
, &dfidp
->path
, &name
, flags
);
2467 put_fid(pdu
, dfidp
);
2468 v9fs_path_free(&path
);
2470 complete_pdu(pdu
->s
, pdu
, err
);
2471 v9fs_string_free(&name
);
2475 /* Only works with path name based fid */
2476 static int v9fs_complete_rename(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2477 int32_t newdirfid
, V9fsString
*name
)
2482 V9fsFidState
*tfidp
;
2483 V9fsState
*s
= pdu
->s
;
2484 V9fsFidState
*dirfidp
= NULL
;
2485 char *old_name
, *new_name
;
2487 v9fs_path_init(&new_path
);
2488 if (newdirfid
!= -1) {
2489 dirfidp
= get_fid(pdu
, newdirfid
);
2490 if (dirfidp
== NULL
) {
2494 BUG_ON(dirfidp
->fid_type
!= P9_FID_NONE
);
2495 v9fs_co_name_to_path(pdu
, &dirfidp
->path
, name
->data
, &new_path
);
2497 old_name
= fidp
->path
.data
;
2498 end
= strrchr(old_name
, '/');
2504 new_name
= g_malloc0(end
- old_name
+ name
->size
+ 1);
2505 strncat(new_name
, old_name
, end
- old_name
);
2506 strncat(new_name
+ (end
- old_name
), name
->data
, name
->size
);
2507 v9fs_co_name_to_path(pdu
, NULL
, new_name
, &new_path
);
2510 err
= v9fs_co_rename(pdu
, &fidp
->path
, &new_path
);
2515 * Fixup fid's pointing to the old name to
2516 * start pointing to the new name
2518 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2519 if (v9fs_path_is_ancestor(&fidp
->path
, &tfidp
->path
)) {
2520 /* replace the name */
2521 v9fs_fix_path(&tfidp
->path
, &new_path
, strlen(fidp
->path
.data
));
2526 put_fid(pdu
, dirfidp
);
2528 v9fs_path_free(&new_path
);
2533 /* Only works with path name based fid */
2534 static void v9fs_rename(void *opaque
)
2542 V9fsPDU
*pdu
= opaque
;
2543 V9fsState
*s
= pdu
->s
;
2545 pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newdirfid
, &name
);
2547 fidp
= get_fid(pdu
, fid
);
2552 BUG_ON(fidp
->fid_type
!= P9_FID_NONE
);
2553 /* if fs driver is not path based, return EOPNOTSUPP */
2554 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2558 v9fs_path_write_lock(s
);
2559 err
= v9fs_complete_rename(pdu
, fidp
, newdirfid
, &name
);
2560 v9fs_path_unlock(s
);
2567 complete_pdu(s
, pdu
, err
);
2568 v9fs_string_free(&name
);
2571 static void v9fs_fix_fid_paths(V9fsPDU
*pdu
, V9fsPath
*olddir
,
2572 V9fsString
*old_name
, V9fsPath
*newdir
,
2573 V9fsString
*new_name
)
2575 V9fsFidState
*tfidp
;
2576 V9fsPath oldpath
, newpath
;
2577 V9fsState
*s
= pdu
->s
;
2580 v9fs_path_init(&oldpath
);
2581 v9fs_path_init(&newpath
);
2582 v9fs_co_name_to_path(pdu
, olddir
, old_name
->data
, &oldpath
);
2583 v9fs_co_name_to_path(pdu
, newdir
, new_name
->data
, &newpath
);
2586 * Fixup fid's pointing to the old name to
2587 * start pointing to the new name
2589 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2590 if (v9fs_path_is_ancestor(&oldpath
, &tfidp
->path
)) {
2591 /* replace the name */
2592 v9fs_fix_path(&tfidp
->path
, &newpath
, strlen(oldpath
.data
));
2595 v9fs_path_free(&oldpath
);
2596 v9fs_path_free(&newpath
);
2599 static int v9fs_complete_renameat(V9fsPDU
*pdu
, int32_t olddirfid
,
2600 V9fsString
*old_name
, int32_t newdirfid
,
2601 V9fsString
*new_name
)
2604 V9fsState
*s
= pdu
->s
;
2605 V9fsFidState
*newdirfidp
= NULL
, *olddirfidp
= NULL
;
2607 olddirfidp
= get_fid(pdu
, olddirfid
);
2608 if (olddirfidp
== NULL
) {
2612 if (newdirfid
!= -1) {
2613 newdirfidp
= get_fid(pdu
, newdirfid
);
2614 if (newdirfidp
== NULL
) {
2619 newdirfidp
= get_fid(pdu
, olddirfid
);
2622 err
= v9fs_co_renameat(pdu
, &olddirfidp
->path
, old_name
,
2623 &newdirfidp
->path
, new_name
);
2627 if (s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
) {
2628 /* Only for path based fid we need to do the below fixup */
2629 v9fs_fix_fid_paths(pdu
, &olddirfidp
->path
, old_name
,
2630 &newdirfidp
->path
, new_name
);
2634 put_fid(pdu
, olddirfidp
);
2637 put_fid(pdu
, newdirfidp
);
2642 static void v9fs_renameat(void *opaque
)
2646 V9fsPDU
*pdu
= opaque
;
2647 V9fsState
*s
= pdu
->s
;
2648 int32_t olddirfid
, newdirfid
;
2649 V9fsString old_name
, new_name
;
2651 pdu_unmarshal(pdu
, offset
, "dsds", &olddirfid
,
2652 &old_name
, &newdirfid
, &new_name
);
2654 v9fs_path_write_lock(s
);
2655 err
= v9fs_complete_renameat(pdu
, olddirfid
,
2656 &old_name
, newdirfid
, &new_name
);
2657 v9fs_path_unlock(s
);
2661 complete_pdu(s
, pdu
, err
);
2662 v9fs_string_free(&old_name
);
2663 v9fs_string_free(&new_name
);
2666 static void v9fs_wstat(void *opaque
)
2675 V9fsPDU
*pdu
= opaque
;
2676 V9fsState
*s
= pdu
->s
;
2678 pdu_unmarshal(pdu
, offset
, "dwS", &fid
, &unused
, &v9stat
);
2679 trace_v9fs_wstat(pdu
->tag
, pdu
->id
, fid
,
2680 v9stat
.mode
, v9stat
.atime
, v9stat
.mtime
);
2682 fidp
= get_fid(pdu
, fid
);
2687 /* do we need to sync the file? */
2688 if (donttouch_stat(&v9stat
)) {
2689 err
= v9fs_co_fsync(pdu
, fidp
, 0);
2692 if (v9stat
.mode
!= -1) {
2694 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2698 v9_mode
= stat_to_v9mode(&stbuf
);
2699 if ((v9stat
.mode
& P9_STAT_MODE_TYPE_BITS
) !=
2700 (v9_mode
& P9_STAT_MODE_TYPE_BITS
)) {
2701 /* Attempting to change the type */
2705 err
= v9fs_co_chmod(pdu
, &fidp
->path
,
2706 v9mode_to_mode(v9stat
.mode
,
2707 &v9stat
.extension
));
2712 if (v9stat
.mtime
!= -1 || v9stat
.atime
!= -1) {
2713 struct timespec times
[2];
2714 if (v9stat
.atime
!= -1) {
2715 times
[0].tv_sec
= v9stat
.atime
;
2716 times
[0].tv_nsec
= 0;
2718 times
[0].tv_nsec
= UTIME_OMIT
;
2720 if (v9stat
.mtime
!= -1) {
2721 times
[1].tv_sec
= v9stat
.mtime
;
2722 times
[1].tv_nsec
= 0;
2724 times
[1].tv_nsec
= UTIME_OMIT
;
2726 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
2731 if (v9stat
.n_gid
!= -1 || v9stat
.n_uid
!= -1) {
2732 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9stat
.n_uid
, v9stat
.n_gid
);
2737 if (v9stat
.name
.size
!= 0) {
2738 err
= v9fs_complete_rename(pdu
, fidp
, -1, &v9stat
.name
);
2743 if (v9stat
.length
!= -1) {
2744 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9stat
.length
);
2753 v9fs_stat_free(&v9stat
);
2754 complete_pdu(s
, pdu
, err
);
2757 static int v9fs_fill_statfs(V9fsState
*s
, V9fsPDU
*pdu
, struct statfs
*stbuf
)
2769 int32_t bsize_factor
;
2772 * compute bsize factor based on host file system block size
2775 bsize_factor
= (s
->msize
- P9_IOHDRSZ
)/stbuf
->f_bsize
;
2776 if (!bsize_factor
) {
2779 f_type
= stbuf
->f_type
;
2780 f_bsize
= stbuf
->f_bsize
;
2781 f_bsize
*= bsize_factor
;
2783 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2784 * adjust(divide) the number of blocks, free blocks and available
2785 * blocks by bsize factor
2787 f_blocks
= stbuf
->f_blocks
/bsize_factor
;
2788 f_bfree
= stbuf
->f_bfree
/bsize_factor
;
2789 f_bavail
= stbuf
->f_bavail
/bsize_factor
;
2790 f_files
= stbuf
->f_files
;
2791 f_ffree
= stbuf
->f_ffree
;
2792 fsid_val
= (unsigned int) stbuf
->f_fsid
.__val
[0] |
2793 (unsigned long long)stbuf
->f_fsid
.__val
[1] << 32;
2794 f_namelen
= stbuf
->f_namelen
;
2796 return pdu_marshal(pdu
, offset
, "ddqqqqqqd",
2797 f_type
, f_bsize
, f_blocks
, f_bfree
,
2798 f_bavail
, f_files
, f_ffree
,
2799 fsid_val
, f_namelen
);
2802 static void v9fs_statfs(void *opaque
)
2808 struct statfs stbuf
;
2809 V9fsPDU
*pdu
= opaque
;
2810 V9fsState
*s
= pdu
->s
;
2812 pdu_unmarshal(pdu
, offset
, "d", &fid
);
2813 fidp
= get_fid(pdu
, fid
);
2818 retval
= v9fs_co_statfs(pdu
, &fidp
->path
, &stbuf
);
2823 retval
+= v9fs_fill_statfs(s
, pdu
, &stbuf
);
2827 complete_pdu(s
, pdu
, retval
);
2831 static void v9fs_mknod(void *opaque
)
2844 V9fsPDU
*pdu
= opaque
;
2845 V9fsState
*s
= pdu
->s
;
2847 pdu_unmarshal(pdu
, offset
, "dsdddd", &fid
, &name
, &mode
,
2848 &major
, &minor
, &gid
);
2849 trace_v9fs_mknod(pdu
->tag
, pdu
->id
, fid
, mode
, major
, minor
);
2851 fidp
= get_fid(pdu
, fid
);
2856 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, gid
,
2857 makedev(major
, minor
), mode
, &stbuf
);
2861 stat_to_qid(&stbuf
, &qid
);
2863 err
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
2864 trace_v9fs_mknod_return(pdu
->tag
, pdu
->id
,
2865 qid
.type
, qid
.version
, qid
.path
);
2869 complete_pdu(s
, pdu
, err
);
2870 v9fs_string_free(&name
);
2874 * Implement posix byte range locking code
2875 * Server side handling of locking code is very simple, because 9p server in
2876 * QEMU can handle only one client. And most of the lock handling
2877 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
2878 * do any thing in * qemu 9p server side lock code path.
2879 * So when a TLOCK request comes, always return success
2881 static void v9fs_lock(void *opaque
)
2888 int32_t fid
, err
= 0;
2889 V9fsPDU
*pdu
= opaque
;
2890 V9fsState
*s
= pdu
->s
;
2892 flock
= g_malloc(sizeof(*flock
));
2893 pdu_unmarshal(pdu
, offset
, "dbdqqds", &fid
, &flock
->type
,
2894 &flock
->flags
, &flock
->start
, &flock
->length
,
2895 &flock
->proc_id
, &flock
->client_id
);
2897 trace_v9fs_lock(pdu
->tag
, pdu
->id
, fid
,
2898 flock
->type
, flock
->start
, flock
->length
);
2900 status
= P9_LOCK_ERROR
;
2902 /* We support only block flag now (that too ignored currently) */
2903 if (flock
->flags
& ~P9_LOCK_FLAGS_BLOCK
) {
2907 fidp
= get_fid(pdu
, fid
);
2912 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
2916 status
= P9_LOCK_SUCCESS
;
2921 err
+= pdu_marshal(pdu
, offset
, "b", status
);
2922 trace_v9fs_lock_return(pdu
->tag
, pdu
->id
, status
);
2923 complete_pdu(s
, pdu
, err
);
2924 v9fs_string_free(&flock
->client_id
);
2929 * When a TGETLOCK request comes, always return success because all lock
2930 * handling is done by client's VFS layer.
2932 static void v9fs_getlock(void *opaque
)
2938 int32_t fid
, err
= 0;
2939 V9fsPDU
*pdu
= opaque
;
2940 V9fsState
*s
= pdu
->s
;
2942 glock
= g_malloc(sizeof(*glock
));
2943 pdu_unmarshal(pdu
, offset
, "dbqqds", &fid
, &glock
->type
,
2944 &glock
->start
, &glock
->length
, &glock
->proc_id
,
2947 trace_v9fs_getlock(pdu
->tag
, pdu
->id
, fid
,
2948 glock
->type
, glock
->start
, glock
->length
);
2950 fidp
= get_fid(pdu
, fid
);
2955 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
2959 glock
->type
= P9_LOCK_TYPE_UNLCK
;
2960 offset
+= pdu_marshal(pdu
, offset
, "bqqds", glock
->type
,
2961 glock
->start
, glock
->length
, glock
->proc_id
,
2964 trace_v9fs_getlock_return(pdu
->tag
, pdu
->id
, glock
->type
, glock
->start
,
2965 glock
->length
, glock
->proc_id
);
2969 complete_pdu(s
, pdu
, err
);
2970 v9fs_string_free(&glock
->client_id
);
2974 static void v9fs_mkdir(void *opaque
)
2976 V9fsPDU
*pdu
= opaque
;
2987 pdu_unmarshal(pdu
, offset
, "dsdd", &fid
, &name
, &mode
, &gid
);
2989 trace_v9fs_mkdir(pdu
->tag
, pdu
->id
, fid
, name
.data
, mode
, gid
);
2991 fidp
= get_fid(pdu
, fid
);
2996 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, mode
, fidp
->uid
, gid
, &stbuf
);
3000 stat_to_qid(&stbuf
, &qid
);
3001 offset
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
3003 trace_v9fs_mkdir_return(pdu
->tag
, pdu
->id
,
3004 qid
.type
, qid
.version
, qid
.path
, err
);
3008 complete_pdu(pdu
->s
, pdu
, err
);
3009 v9fs_string_free(&name
);
3012 static void v9fs_xattrwalk(void *opaque
)
3018 int32_t fid
, newfid
;
3019 V9fsFidState
*file_fidp
;
3020 V9fsFidState
*xattr_fidp
= NULL
;
3021 V9fsPDU
*pdu
= opaque
;
3022 V9fsState
*s
= pdu
->s
;
3024 pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newfid
, &name
);
3025 trace_v9fs_xattrwalk(pdu
->tag
, pdu
->id
, fid
, newfid
, name
.data
);
3027 file_fidp
= get_fid(pdu
, fid
);
3028 if (file_fidp
== NULL
) {
3032 xattr_fidp
= alloc_fid(s
, newfid
);
3033 if (xattr_fidp
== NULL
) {
3037 v9fs_path_copy(&xattr_fidp
->path
, &file_fidp
->path
);
3038 if (name
.data
[0] == 0) {
3040 * listxattr request. Get the size first
3042 size
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
, NULL
, 0);
3045 clunk_fid(s
, xattr_fidp
->fid
);
3049 * Read the xattr value
3051 xattr_fidp
->fs
.xattr
.len
= size
;
3052 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3053 xattr_fidp
->fs
.xattr
.copied_len
= -1;
3055 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3056 err
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
,
3057 xattr_fidp
->fs
.xattr
.value
,
3058 xattr_fidp
->fs
.xattr
.len
);
3060 clunk_fid(s
, xattr_fidp
->fid
);
3064 offset
+= pdu_marshal(pdu
, offset
, "q", size
);
3068 * specific xattr fid. We check for xattr
3069 * presence also collect the xattr size
3071 size
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3075 clunk_fid(s
, xattr_fidp
->fid
);
3079 * Read the xattr value
3081 xattr_fidp
->fs
.xattr
.len
= size
;
3082 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3083 xattr_fidp
->fs
.xattr
.copied_len
= -1;
3085 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3086 err
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3087 &name
, xattr_fidp
->fs
.xattr
.value
,
3088 xattr_fidp
->fs
.xattr
.len
);
3090 clunk_fid(s
, xattr_fidp
->fid
);
3094 offset
+= pdu_marshal(pdu
, offset
, "q", size
);
3097 trace_v9fs_xattrwalk_return(pdu
->tag
, pdu
->id
, size
);
3099 put_fid(pdu
, file_fidp
);
3101 put_fid(pdu
, xattr_fidp
);
3104 complete_pdu(s
, pdu
, err
);
3105 v9fs_string_free(&name
);
3108 static void v9fs_xattrcreate(void *opaque
)
3116 V9fsFidState
*file_fidp
;
3117 V9fsFidState
*xattr_fidp
;
3118 V9fsPDU
*pdu
= opaque
;
3119 V9fsState
*s
= pdu
->s
;
3121 pdu_unmarshal(pdu
, offset
, "dsqd",
3122 &fid
, &name
, &size
, &flags
);
3123 trace_v9fs_xattrcreate(pdu
->tag
, pdu
->id
, fid
, name
.data
, size
, flags
);
3125 file_fidp
= get_fid(pdu
, fid
);
3126 if (file_fidp
== NULL
) {
3130 /* Make the file fid point to xattr */
3131 xattr_fidp
= file_fidp
;
3132 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3133 xattr_fidp
->fs
.xattr
.copied_len
= 0;
3134 xattr_fidp
->fs
.xattr
.len
= size
;
3135 xattr_fidp
->fs
.xattr
.flags
= flags
;
3136 v9fs_string_init(&xattr_fidp
->fs
.xattr
.name
);
3137 v9fs_string_copy(&xattr_fidp
->fs
.xattr
.name
, &name
);
3139 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3141 xattr_fidp
->fs
.xattr
.value
= NULL
;
3144 put_fid(pdu
, file_fidp
);
3146 complete_pdu(s
, pdu
, err
);
3147 v9fs_string_free(&name
);
3150 static void v9fs_readlink(void *opaque
)
3152 V9fsPDU
*pdu
= opaque
;
3159 pdu_unmarshal(pdu
, offset
, "d", &fid
);
3160 trace_v9fs_readlink(pdu
->tag
, pdu
->id
, fid
);
3161 fidp
= get_fid(pdu
, fid
);
3167 v9fs_string_init(&target
);
3168 err
= v9fs_co_readlink(pdu
, &fidp
->path
, &target
);
3172 offset
+= pdu_marshal(pdu
, offset
, "s", &target
);
3174 trace_v9fs_readlink_return(pdu
->tag
, pdu
->id
, target
.data
);
3175 v9fs_string_free(&target
);
3179 complete_pdu(pdu
->s
, pdu
, err
);
3182 static CoroutineEntry
*pdu_co_handlers
[] = {
3183 [P9_TREADDIR
] = v9fs_readdir
,
3184 [P9_TSTATFS
] = v9fs_statfs
,
3185 [P9_TGETATTR
] = v9fs_getattr
,
3186 [P9_TSETATTR
] = v9fs_setattr
,
3187 [P9_TXATTRWALK
] = v9fs_xattrwalk
,
3188 [P9_TXATTRCREATE
] = v9fs_xattrcreate
,
3189 [P9_TMKNOD
] = v9fs_mknod
,
3190 [P9_TRENAME
] = v9fs_rename
,
3191 [P9_TLOCK
] = v9fs_lock
,
3192 [P9_TGETLOCK
] = v9fs_getlock
,
3193 [P9_TRENAMEAT
] = v9fs_renameat
,
3194 [P9_TREADLINK
] = v9fs_readlink
,
3195 [P9_TUNLINKAT
] = v9fs_unlinkat
,
3196 [P9_TMKDIR
] = v9fs_mkdir
,
3197 [P9_TVERSION
] = v9fs_version
,
3198 [P9_TLOPEN
] = v9fs_open
,
3199 [P9_TATTACH
] = v9fs_attach
,
3200 [P9_TSTAT
] = v9fs_stat
,
3201 [P9_TWALK
] = v9fs_walk
,
3202 [P9_TCLUNK
] = v9fs_clunk
,
3203 [P9_TFSYNC
] = v9fs_fsync
,
3204 [P9_TOPEN
] = v9fs_open
,
3205 [P9_TREAD
] = v9fs_read
,
3207 [P9_TAUTH
] = v9fs_auth
,
3209 [P9_TFLUSH
] = v9fs_flush
,
3210 [P9_TLINK
] = v9fs_link
,
3211 [P9_TSYMLINK
] = v9fs_symlink
,
3212 [P9_TCREATE
] = v9fs_create
,
3213 [P9_TLCREATE
] = v9fs_lcreate
,
3214 [P9_TWRITE
] = v9fs_write
,
3215 [P9_TWSTAT
] = v9fs_wstat
,
3216 [P9_TREMOVE
] = v9fs_remove
,
3219 static void v9fs_op_not_supp(void *opaque
)
3221 V9fsPDU
*pdu
= opaque
;
3222 complete_pdu(pdu
->s
, pdu
, -EOPNOTSUPP
);
3225 static void v9fs_fs_ro(void *opaque
)
3227 V9fsPDU
*pdu
= opaque
;
3228 complete_pdu(pdu
->s
, pdu
, -EROFS
);
3231 static inline bool is_read_only_op(V9fsPDU
*pdu
)
3258 static void submit_pdu(V9fsState
*s
, V9fsPDU
*pdu
)
3261 CoroutineEntry
*handler
;
3263 if (pdu
->id
>= ARRAY_SIZE(pdu_co_handlers
) ||
3264 (pdu_co_handlers
[pdu
->id
] == NULL
)) {
3265 handler
= v9fs_op_not_supp
;
3267 handler
= pdu_co_handlers
[pdu
->id
];
3270 if (is_ro_export(&s
->ctx
) && !is_read_only_op(pdu
)) {
3271 handler
= v9fs_fs_ro
;
3273 co
= qemu_coroutine_create(handler
);
3274 qemu_coroutine_enter(co
, pdu
);
3277 void handle_9p_output(VirtIODevice
*vdev
, VirtQueue
*vq
)
3279 V9fsState
*s
= (V9fsState
*)vdev
;
3283 while ((pdu
= alloc_pdu(s
)) &&
3284 (len
= virtqueue_pop(vq
, &pdu
->elem
)) != 0) {
3287 BUG_ON(pdu
->elem
.out_num
== 0 || pdu
->elem
.in_num
== 0);
3288 BUG_ON(pdu
->elem
.out_sg
[0].iov_len
< 7);
3290 ptr
= pdu
->elem
.out_sg
[0].iov_base
;
3292 memcpy(&pdu
->size
, ptr
, 4);
3294 memcpy(&pdu
->tag
, ptr
+ 5, 2);
3295 qemu_co_queue_init(&pdu
->complete
);
3301 void virtio_9p_set_fd_limit(void)
3304 if (getrlimit(RLIMIT_NOFILE
, &rlim
) < 0) {
3305 fprintf(stderr
, "Failed to get the resource limit\n");
3308 open_fd_hw
= rlim
.rlim_cur
- MIN(400, rlim
.rlim_cur
/3);
3309 open_fd_rc
= rlim
.rlim_cur
/2;