4 * Copyright IBM, Corp. 2010
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #include "hw/virtio.h"
16 #include "qemu_socket.h"
17 #include "hw/virtio-pci.h"
18 #include "virtio-9p.h"
19 #include "fsdev/qemu-fsdev.h"
20 #include "virtio-9p-xattr.h"
21 #include "virtio-9p-coth.h"
26 static int open_fd_rc
;
40 static int omode_to_uflags(int8_t mode
)
74 static int dotl_to_at_flags(int flags
)
77 if (flags
& P9_DOTL_AT_REMOVEDIR
) {
78 rflags
|= AT_REMOVEDIR
;
83 struct dotl_openflag_map
{
88 static int dotl_to_open_flags(int flags
)
92 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
93 * and P9_DOTL_NOACCESS
95 int oflags
= flags
& O_ACCMODE
;
97 struct dotl_openflag_map dotl_oflag_map
[] = {
98 { P9_DOTL_CREATE
, O_CREAT
},
99 { P9_DOTL_EXCL
, O_EXCL
},
100 { P9_DOTL_NOCTTY
, O_NOCTTY
},
101 { P9_DOTL_TRUNC
, O_TRUNC
},
102 { P9_DOTL_APPEND
, O_APPEND
},
103 { P9_DOTL_NONBLOCK
, O_NONBLOCK
} ,
104 { P9_DOTL_DSYNC
, O_DSYNC
},
105 { P9_DOTL_FASYNC
, FASYNC
},
106 { P9_DOTL_DIRECT
, O_DIRECT
},
107 { P9_DOTL_LARGEFILE
, O_LARGEFILE
},
108 { P9_DOTL_DIRECTORY
, O_DIRECTORY
},
109 { P9_DOTL_NOFOLLOW
, O_NOFOLLOW
},
110 { P9_DOTL_NOATIME
, O_NOATIME
},
111 { P9_DOTL_SYNC
, O_SYNC
},
114 for (i
= 0; i
< ARRAY_SIZE(dotl_oflag_map
); i
++) {
115 if (flags
& dotl_oflag_map
[i
].dotl_flag
) {
116 oflags
|= dotl_oflag_map
[i
].open_flag
;
123 void cred_init(FsCred
*credp
)
131 static int get_dotl_openflags(V9fsState
*s
, int oflags
)
135 * Filter the client open flags
137 flags
= dotl_to_open_flags(oflags
);
138 flags
&= ~(O_NOCTTY
| O_ASYNC
| O_CREAT
);
140 * Ignore direct disk access hint until the server supports it.
146 void v9fs_string_init(V9fsString
*str
)
152 void v9fs_string_free(V9fsString
*str
)
159 void v9fs_string_null(V9fsString
*str
)
161 v9fs_string_free(str
);
164 static int number_to_string(void *arg
, char type
)
166 unsigned int ret
= 0;
170 unsigned int num
= *(unsigned int *)arg
;
179 unsigned long num
= *(unsigned long *)arg
;
187 printf("Number_to_string: Unknown number format\n");
194 static int GCC_FMT_ATTR(2, 0)
195 v9fs_string_alloc_printf(char **strp
, const char *fmt
, va_list ap
)
198 char *iter
= (char *)fmt
;
202 unsigned int arg_uint
;
203 unsigned long arg_ulong
;
205 /* Find the number of %'s that denotes an argument */
206 for (iter
= strstr(iter
, "%"); iter
; iter
= strstr(iter
, "%")) {
211 len
= strlen(fmt
) - 2*nr_args
;
221 /* Now parse the format string */
222 for (iter
= strstr(iter
, "%"); iter
; iter
= strstr(iter
, "%")) {
226 arg_uint
= va_arg(ap2
, unsigned int);
227 len
+= number_to_string((void *)&arg_uint
, 'u');
230 if (*++iter
== 'u') {
231 arg_ulong
= va_arg(ap2
, unsigned long);
232 len
+= number_to_string((void *)&arg_ulong
, 'U');
238 arg_char_ptr
= va_arg(ap2
, char *);
239 len
+= strlen(arg_char_ptr
);
246 "v9fs_string_alloc_printf:Incorrect format %c", *iter
);
253 *strp
= g_malloc((len
+ 1) * sizeof(**strp
));
255 return vsprintf(*strp
, fmt
, ap
);
258 void GCC_FMT_ATTR(2, 3)
259 v9fs_string_sprintf(V9fsString
*str
, const char *fmt
, ...)
264 v9fs_string_free(str
);
267 err
= v9fs_string_alloc_printf(&str
->data
, fmt
, ap
);
274 void v9fs_string_copy(V9fsString
*lhs
, V9fsString
*rhs
)
276 v9fs_string_free(lhs
);
277 v9fs_string_sprintf(lhs
, "%s", rhs
->data
);
280 void v9fs_path_init(V9fsPath
*path
)
286 void v9fs_path_free(V9fsPath
*path
)
293 void v9fs_path_copy(V9fsPath
*lhs
, V9fsPath
*rhs
)
296 lhs
->data
= g_malloc(rhs
->size
);
297 memcpy(lhs
->data
, rhs
->data
, rhs
->size
);
298 lhs
->size
= rhs
->size
;
301 int v9fs_name_to_path(V9fsState
*s
, V9fsPath
*dirpath
,
302 const char *name
, V9fsPath
*path
)
305 err
= s
->ops
->name_to_path(&s
->ctx
, dirpath
, name
, path
);
313 * Return TRUE if s1 is an ancestor of s2.
315 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
316 * As a special case, We treat s1 as ancestor of s2 if they are same!
318 static int v9fs_path_is_ancestor(V9fsPath
*s1
, V9fsPath
*s2
)
320 if (!strncmp(s1
->data
, s2
->data
, s1
->size
- 1)) {
321 if (s2
->data
[s1
->size
- 1] == '\0' || s2
->data
[s1
->size
- 1] == '/') {
328 static size_t v9fs_string_size(V9fsString
*str
)
334 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
335 static int v9fs_reopen_fid(V9fsPDU
*pdu
, V9fsFidState
*f
)
338 if (f
->fid_type
== P9_FID_FILE
) {
339 if (f
->fs
.fd
== -1) {
341 err
= v9fs_co_open(pdu
, f
, f
->open_flags
);
342 } while (err
== -EINTR
&& !pdu
->cancelled
);
344 } else if (f
->fid_type
== P9_FID_DIR
) {
345 if (f
->fs
.dir
== NULL
) {
347 err
= v9fs_co_opendir(pdu
, f
);
348 } while (err
== -EINTR
&& !pdu
->cancelled
);
354 static V9fsFidState
*get_fid(V9fsPDU
*pdu
, int32_t fid
)
358 V9fsState
*s
= pdu
->s
;
360 for (f
= s
->fid_list
; f
; f
= f
->next
) {
364 * Update the fid ref upfront so that
365 * we don't get reclaimed when we yield
370 * check whether we need to reopen the
371 * file. We might have closed the fd
372 * while trying to free up some file
375 err
= v9fs_reopen_fid(pdu
, f
);
381 * Mark the fid as referenced so that the LRU
382 * reclaim won't close the file descriptor
384 f
->flags
|= FID_REFERENCED
;
391 static V9fsFidState
*alloc_fid(V9fsState
*s
, int32_t fid
)
395 for (f
= s
->fid_list
; f
; f
= f
->next
) {
396 /* If fid is already there return NULL */
402 f
= g_malloc0(sizeof(V9fsFidState
));
404 f
->fid_type
= P9_FID_NONE
;
407 * Mark the fid as referenced so that the LRU
408 * reclaim won't close the file descriptor
410 f
->flags
|= FID_REFERENCED
;
411 f
->next
= s
->fid_list
;
417 static int v9fs_xattr_fid_clunk(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
421 if (fidp
->fs
.xattr
.copied_len
== -1) {
422 /* getxattr/listxattr fid */
426 * if this is fid for setxattr. clunk should
427 * result in setxattr localcall
429 if (fidp
->fs
.xattr
.len
!= fidp
->fs
.xattr
.copied_len
) {
430 /* clunk after partial write */
434 if (fidp
->fs
.xattr
.len
) {
435 retval
= v9fs_co_lsetxattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
,
436 fidp
->fs
.xattr
.value
,
438 fidp
->fs
.xattr
.flags
);
440 retval
= v9fs_co_lremovexattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
);
443 v9fs_string_free(&fidp
->fs
.xattr
.name
);
445 if (fidp
->fs
.xattr
.value
) {
446 g_free(fidp
->fs
.xattr
.value
);
451 static int free_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
455 if (fidp
->fid_type
== P9_FID_FILE
) {
456 /* If we reclaimed the fd no need to close */
457 if (fidp
->fs
.fd
!= -1) {
458 retval
= v9fs_co_close(pdu
, &fidp
->fs
);
460 } else if (fidp
->fid_type
== P9_FID_DIR
) {
461 if (fidp
->fs
.dir
!= NULL
) {
462 retval
= v9fs_co_closedir(pdu
, &fidp
->fs
);
464 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
465 retval
= v9fs_xattr_fid_clunk(pdu
, fidp
);
467 v9fs_path_free(&fidp
->path
);
472 static void put_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
477 * Don't free the fid if it is in reclaim list
479 if (!fidp
->ref
&& fidp
->clunked
) {
484 static V9fsFidState
*clunk_fid(V9fsState
*s
, int32_t fid
)
486 V9fsFidState
**fidpp
, *fidp
;
488 for (fidpp
= &s
->fid_list
; *fidpp
; fidpp
= &(*fidpp
)->next
) {
489 if ((*fidpp
)->fid
== fid
) {
493 if (*fidpp
== NULL
) {
502 void v9fs_reclaim_fd(V9fsPDU
*pdu
)
504 int reclaim_count
= 0;
505 V9fsState
*s
= pdu
->s
;
506 V9fsFidState
*f
, *reclaim_list
= NULL
;
508 for (f
= s
->fid_list
; f
; f
= f
->next
) {
510 * Unlink fids cannot be reclaimed. Check
511 * for them and skip them. Also skip fids
512 * currently being operated on.
514 if (f
->ref
|| f
->flags
& FID_NON_RECLAIMABLE
) {
518 * if it is a recently referenced fid
519 * we leave the fid untouched and clear the
520 * reference bit. We come back to it later
521 * in the next iteration. (a simple LRU without
522 * moving list elements around)
524 if (f
->flags
& FID_REFERENCED
) {
525 f
->flags
&= ~FID_REFERENCED
;
529 * Add fids to reclaim list.
531 if (f
->fid_type
== P9_FID_FILE
) {
532 if (f
->fs
.fd
!= -1) {
534 * Up the reference count so that
535 * a clunk request won't free this fid
538 f
->rclm_lst
= reclaim_list
;
540 f
->fs_reclaim
.fd
= f
->fs
.fd
;
544 } else if (f
->fid_type
== P9_FID_DIR
) {
545 if (f
->fs
.dir
!= NULL
) {
547 * Up the reference count so that
548 * a clunk request won't free this fid
551 f
->rclm_lst
= reclaim_list
;
553 f
->fs_reclaim
.dir
= f
->fs
.dir
;
558 if (reclaim_count
>= open_fd_rc
) {
563 * Now close the fid in reclaim list. Free them if they
564 * are already clunked.
566 while (reclaim_list
) {
568 reclaim_list
= f
->rclm_lst
;
569 if (f
->fid_type
== P9_FID_FILE
) {
570 v9fs_co_close(pdu
, &f
->fs_reclaim
);
571 } else if (f
->fid_type
== P9_FID_DIR
) {
572 v9fs_co_closedir(pdu
, &f
->fs_reclaim
);
576 * Now drop the fid reference, free it
583 static int v9fs_mark_fids_unreclaim(V9fsPDU
*pdu
, V9fsPath
*path
)
586 V9fsState
*s
= pdu
->s
;
587 V9fsFidState
*fidp
, head_fid
;
589 head_fid
.next
= s
->fid_list
;
590 for (fidp
= s
->fid_list
; fidp
; fidp
= fidp
->next
) {
591 if (fidp
->path
.size
!= path
->size
) {
594 if (!memcmp(fidp
->path
.data
, path
->data
, path
->size
)) {
595 /* Mark the fid non reclaimable. */
596 fidp
->flags
|= FID_NON_RECLAIMABLE
;
598 /* reopen the file/dir if already closed */
599 err
= v9fs_reopen_fid(pdu
, fidp
);
604 * Go back to head of fid list because
605 * the list could have got updated when
606 * switched to the worker thread
616 #define P9_QID_TYPE_DIR 0x80
617 #define P9_QID_TYPE_SYMLINK 0x02
619 #define P9_STAT_MODE_DIR 0x80000000
620 #define P9_STAT_MODE_APPEND 0x40000000
621 #define P9_STAT_MODE_EXCL 0x20000000
622 #define P9_STAT_MODE_MOUNT 0x10000000
623 #define P9_STAT_MODE_AUTH 0x08000000
624 #define P9_STAT_MODE_TMP 0x04000000
625 #define P9_STAT_MODE_SYMLINK 0x02000000
626 #define P9_STAT_MODE_LINK 0x01000000
627 #define P9_STAT_MODE_DEVICE 0x00800000
628 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
629 #define P9_STAT_MODE_SOCKET 0x00100000
630 #define P9_STAT_MODE_SETUID 0x00080000
631 #define P9_STAT_MODE_SETGID 0x00040000
632 #define P9_STAT_MODE_SETVTX 0x00010000
634 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
635 P9_STAT_MODE_SYMLINK | \
636 P9_STAT_MODE_LINK | \
637 P9_STAT_MODE_DEVICE | \
638 P9_STAT_MODE_NAMED_PIPE | \
641 /* This is the algorithm from ufs in spfs */
642 static void stat_to_qid(const struct stat
*stbuf
, V9fsQID
*qidp
)
646 memset(&qidp
->path
, 0, sizeof(qidp
->path
));
647 size
= MIN(sizeof(stbuf
->st_ino
), sizeof(qidp
->path
));
648 memcpy(&qidp
->path
, &stbuf
->st_ino
, size
);
649 qidp
->version
= stbuf
->st_mtime
^ (stbuf
->st_size
<< 8);
651 if (S_ISDIR(stbuf
->st_mode
)) {
652 qidp
->type
|= P9_QID_TYPE_DIR
;
654 if (S_ISLNK(stbuf
->st_mode
)) {
655 qidp
->type
|= P9_QID_TYPE_SYMLINK
;
659 static int fid_to_qid(V9fsPDU
*pdu
, V9fsFidState
*fidp
, V9fsQID
*qidp
)
664 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
668 stat_to_qid(&stbuf
, qidp
);
672 static V9fsPDU
*alloc_pdu(V9fsState
*s
)
676 if (!QLIST_EMPTY(&s
->free_list
)) {
677 pdu
= QLIST_FIRST(&s
->free_list
);
678 QLIST_REMOVE(pdu
, next
);
679 QLIST_INSERT_HEAD(&s
->active_list
, pdu
, next
);
684 static void free_pdu(V9fsState
*s
, V9fsPDU
*pdu
)
688 * Cancelled pdu are added back to the freelist
691 if (!pdu
->cancelled
) {
692 QLIST_REMOVE(pdu
, next
);
693 QLIST_INSERT_HEAD(&s
->free_list
, pdu
, next
);
698 size_t pdu_packunpack(void *addr
, struct iovec
*sg
, int sg_count
,
699 size_t offset
, size_t size
, int pack
)
704 for (i
= 0; size
&& i
< sg_count
; i
++) {
706 if (offset
>= sg
[i
].iov_len
) {
708 offset
-= sg
[i
].iov_len
;
711 len
= MIN(sg
[i
].iov_len
- offset
, size
);
713 memcpy(sg
[i
].iov_base
+ offset
, addr
, len
);
715 memcpy(addr
, sg
[i
].iov_base
+ offset
, len
);
730 static size_t pdu_unpack(void *dst
, V9fsPDU
*pdu
, size_t offset
, size_t size
)
732 return pdu_packunpack(dst
, pdu
->elem
.out_sg
, pdu
->elem
.out_num
,
736 static size_t pdu_pack(V9fsPDU
*pdu
, size_t offset
, const void *src
,
739 return pdu_packunpack((void *)src
, pdu
->elem
.in_sg
, pdu
->elem
.in_num
,
743 static int pdu_copy_sg(V9fsPDU
*pdu
, size_t offset
, int rx
, struct iovec
*sg
)
747 struct iovec
*src_sg
;
751 src_sg
= pdu
->elem
.in_sg
;
752 num
= pdu
->elem
.in_num
;
754 src_sg
= pdu
->elem
.out_sg
;
755 num
= pdu
->elem
.out_num
;
759 for (i
= 0; i
< num
; i
++) {
761 sg
[j
].iov_base
= src_sg
[i
].iov_base
;
762 sg
[j
].iov_len
= src_sg
[i
].iov_len
;
764 } else if (offset
< (src_sg
[i
].iov_len
+ pos
)) {
765 sg
[j
].iov_base
= src_sg
[i
].iov_base
;
766 sg
[j
].iov_len
= src_sg
[i
].iov_len
;
767 sg
[j
].iov_base
+= (offset
- pos
);
768 sg
[j
].iov_len
-= (offset
- pos
);
771 pos
+= src_sg
[i
].iov_len
;
777 static size_t pdu_unmarshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
779 size_t old_offset
= offset
;
784 for (i
= 0; fmt
[i
]; i
++) {
787 uint8_t *valp
= va_arg(ap
, uint8_t *);
788 offset
+= pdu_unpack(valp
, pdu
, offset
, sizeof(*valp
));
793 valp
= va_arg(ap
, uint16_t *);
794 offset
+= pdu_unpack(&val
, pdu
, offset
, sizeof(val
));
795 *valp
= le16_to_cpu(val
);
800 valp
= va_arg(ap
, uint32_t *);
801 offset
+= pdu_unpack(&val
, pdu
, offset
, sizeof(val
));
802 *valp
= le32_to_cpu(val
);
807 valp
= va_arg(ap
, uint64_t *);
808 offset
+= pdu_unpack(&val
, pdu
, offset
, sizeof(val
));
809 *valp
= le64_to_cpu(val
);
813 struct iovec
*iov
= va_arg(ap
, struct iovec
*);
814 int *iovcnt
= va_arg(ap
, int *);
815 *iovcnt
= pdu_copy_sg(pdu
, offset
, 0, iov
);
819 V9fsString
*str
= va_arg(ap
, V9fsString
*);
820 offset
+= pdu_unmarshal(pdu
, offset
, "w", &str
->size
);
821 /* FIXME: sanity check str->size */
822 str
->data
= g_malloc(str
->size
+ 1);
823 offset
+= pdu_unpack(str
->data
, pdu
, offset
, str
->size
);
824 str
->data
[str
->size
] = 0;
828 V9fsQID
*qidp
= va_arg(ap
, V9fsQID
*);
829 offset
+= pdu_unmarshal(pdu
, offset
, "bdq",
830 &qidp
->type
, &qidp
->version
, &qidp
->path
);
834 V9fsStat
*statp
= va_arg(ap
, V9fsStat
*);
835 offset
+= pdu_unmarshal(pdu
, offset
, "wwdQdddqsssssddd",
836 &statp
->size
, &statp
->type
, &statp
->dev
,
837 &statp
->qid
, &statp
->mode
, &statp
->atime
,
838 &statp
->mtime
, &statp
->length
,
839 &statp
->name
, &statp
->uid
, &statp
->gid
,
840 &statp
->muid
, &statp
->extension
,
841 &statp
->n_uid
, &statp
->n_gid
,
846 V9fsIattr
*iattr
= va_arg(ap
, V9fsIattr
*);
847 offset
+= pdu_unmarshal(pdu
, offset
, "ddddqqqqq",
848 &iattr
->valid
, &iattr
->mode
,
849 &iattr
->uid
, &iattr
->gid
, &iattr
->size
,
850 &iattr
->atime_sec
, &iattr
->atime_nsec
,
851 &iattr
->mtime_sec
, &iattr
->mtime_nsec
);
861 return offset
- old_offset
;
864 static size_t pdu_marshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
866 size_t old_offset
= offset
;
871 for (i
= 0; fmt
[i
]; i
++) {
874 uint8_t val
= va_arg(ap
, int);
875 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
880 cpu_to_le16w(&val
, va_arg(ap
, int));
881 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
886 cpu_to_le32w(&val
, va_arg(ap
, uint32_t));
887 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
892 cpu_to_le64w(&val
, va_arg(ap
, uint64_t));
893 offset
+= pdu_pack(pdu
, offset
, &val
, sizeof(val
));
897 struct iovec
*iov
= va_arg(ap
, struct iovec
*);
898 int *iovcnt
= va_arg(ap
, int *);
899 *iovcnt
= pdu_copy_sg(pdu
, offset
, 1, iov
);
903 V9fsString
*str
= va_arg(ap
, V9fsString
*);
904 offset
+= pdu_marshal(pdu
, offset
, "w", str
->size
);
905 offset
+= pdu_pack(pdu
, offset
, str
->data
, str
->size
);
909 V9fsQID
*qidp
= va_arg(ap
, V9fsQID
*);
910 offset
+= pdu_marshal(pdu
, offset
, "bdq",
911 qidp
->type
, qidp
->version
, qidp
->path
);
915 V9fsStat
*statp
= va_arg(ap
, V9fsStat
*);
916 offset
+= pdu_marshal(pdu
, offset
, "wwdQdddqsssssddd",
917 statp
->size
, statp
->type
, statp
->dev
,
918 &statp
->qid
, statp
->mode
, statp
->atime
,
919 statp
->mtime
, statp
->length
, &statp
->name
,
920 &statp
->uid
, &statp
->gid
, &statp
->muid
,
921 &statp
->extension
, statp
->n_uid
,
922 statp
->n_gid
, statp
->n_muid
);
926 V9fsStatDotl
*statp
= va_arg(ap
, V9fsStatDotl
*);
927 offset
+= pdu_marshal(pdu
, offset
, "qQdddqqqqqqqqqqqqqqq",
928 statp
->st_result_mask
,
929 &statp
->qid
, statp
->st_mode
,
930 statp
->st_uid
, statp
->st_gid
,
931 statp
->st_nlink
, statp
->st_rdev
,
932 statp
->st_size
, statp
->st_blksize
, statp
->st_blocks
,
933 statp
->st_atime_sec
, statp
->st_atime_nsec
,
934 statp
->st_mtime_sec
, statp
->st_mtime_nsec
,
935 statp
->st_ctime_sec
, statp
->st_ctime_nsec
,
936 statp
->st_btime_sec
, statp
->st_btime_nsec
,
937 statp
->st_gen
, statp
->st_data_version
);
946 return offset
- old_offset
;
949 static void complete_pdu(V9fsState
*s
, V9fsPDU
*pdu
, ssize_t len
)
951 int8_t id
= pdu
->id
+ 1; /* Response */
957 if (s
->proto_version
!= V9FS_PROTO_2000L
) {
960 str
.data
= strerror(err
);
961 str
.size
= strlen(str
.data
);
963 len
+= pdu_marshal(pdu
, len
, "s", &str
);
967 len
+= pdu_marshal(pdu
, len
, "d", err
);
969 if (s
->proto_version
== V9FS_PROTO_2000L
) {
972 trace_v9fs_rerror(pdu
->tag
, pdu
->id
, err
); /* Trace ERROR */
975 /* fill out the header */
976 pdu_marshal(pdu
, 0, "dbw", (int32_t)len
, id
, pdu
->tag
);
978 /* keep these in sync */
982 /* push onto queue and notify */
983 virtqueue_push(s
->vq
, &pdu
->elem
, len
);
985 /* FIXME: we should batch these completions */
986 virtio_notify(&s
->vdev
, s
->vq
);
988 /* Now wakeup anybody waiting in flush for this request */
989 qemu_co_queue_next(&pdu
->complete
);
994 static mode_t
v9mode_to_mode(uint32_t mode
, V9fsString
*extension
)
999 if (mode
& P9_STAT_MODE_DIR
) {
1003 if (mode
& P9_STAT_MODE_SYMLINK
) {
1006 if (mode
& P9_STAT_MODE_SOCKET
) {
1009 if (mode
& P9_STAT_MODE_NAMED_PIPE
) {
1012 if (mode
& P9_STAT_MODE_DEVICE
) {
1013 if (extension
&& extension
->data
[0] == 'c') {
1024 if (mode
& P9_STAT_MODE_SETUID
) {
1027 if (mode
& P9_STAT_MODE_SETGID
) {
1030 if (mode
& P9_STAT_MODE_SETVTX
) {
1037 static int donttouch_stat(V9fsStat
*stat
)
1039 if (stat
->type
== -1 &&
1041 stat
->qid
.type
== -1 &&
1042 stat
->qid
.version
== -1 &&
1043 stat
->qid
.path
== -1 &&
1045 stat
->atime
== -1 &&
1046 stat
->mtime
== -1 &&
1047 stat
->length
== -1 &&
1052 stat
->n_uid
== -1 &&
1053 stat
->n_gid
== -1 &&
1054 stat
->n_muid
== -1) {
1061 static void v9fs_stat_free(V9fsStat
*stat
)
1063 v9fs_string_free(&stat
->name
);
1064 v9fs_string_free(&stat
->uid
);
1065 v9fs_string_free(&stat
->gid
);
1066 v9fs_string_free(&stat
->muid
);
1067 v9fs_string_free(&stat
->extension
);
1070 static uint32_t stat_to_v9mode(const struct stat
*stbuf
)
1074 mode
= stbuf
->st_mode
& 0777;
1075 if (S_ISDIR(stbuf
->st_mode
)) {
1076 mode
|= P9_STAT_MODE_DIR
;
1079 if (S_ISLNK(stbuf
->st_mode
)) {
1080 mode
|= P9_STAT_MODE_SYMLINK
;
1083 if (S_ISSOCK(stbuf
->st_mode
)) {
1084 mode
|= P9_STAT_MODE_SOCKET
;
1087 if (S_ISFIFO(stbuf
->st_mode
)) {
1088 mode
|= P9_STAT_MODE_NAMED_PIPE
;
1091 if (S_ISBLK(stbuf
->st_mode
) || S_ISCHR(stbuf
->st_mode
)) {
1092 mode
|= P9_STAT_MODE_DEVICE
;
1095 if (stbuf
->st_mode
& S_ISUID
) {
1096 mode
|= P9_STAT_MODE_SETUID
;
1099 if (stbuf
->st_mode
& S_ISGID
) {
1100 mode
|= P9_STAT_MODE_SETGID
;
1103 if (stbuf
->st_mode
& S_ISVTX
) {
1104 mode
|= P9_STAT_MODE_SETVTX
;
1110 static int stat_to_v9stat(V9fsPDU
*pdu
, V9fsPath
*name
,
1111 const struct stat
*stbuf
,
1117 memset(v9stat
, 0, sizeof(*v9stat
));
1119 stat_to_qid(stbuf
, &v9stat
->qid
);
1120 v9stat
->mode
= stat_to_v9mode(stbuf
);
1121 v9stat
->atime
= stbuf
->st_atime
;
1122 v9stat
->mtime
= stbuf
->st_mtime
;
1123 v9stat
->length
= stbuf
->st_size
;
1125 v9fs_string_null(&v9stat
->uid
);
1126 v9fs_string_null(&v9stat
->gid
);
1127 v9fs_string_null(&v9stat
->muid
);
1129 v9stat
->n_uid
= stbuf
->st_uid
;
1130 v9stat
->n_gid
= stbuf
->st_gid
;
1133 v9fs_string_null(&v9stat
->extension
);
1135 if (v9stat
->mode
& P9_STAT_MODE_SYMLINK
) {
1136 err
= v9fs_co_readlink(pdu
, name
, &v9stat
->extension
);
1140 } else if (v9stat
->mode
& P9_STAT_MODE_DEVICE
) {
1141 v9fs_string_sprintf(&v9stat
->extension
, "%c %u %u",
1142 S_ISCHR(stbuf
->st_mode
) ? 'c' : 'b',
1143 major(stbuf
->st_rdev
), minor(stbuf
->st_rdev
));
1144 } else if (S_ISDIR(stbuf
->st_mode
) || S_ISREG(stbuf
->st_mode
)) {
1145 v9fs_string_sprintf(&v9stat
->extension
, "%s %lu",
1146 "HARDLINKCOUNT", (unsigned long)stbuf
->st_nlink
);
1149 str
= strrchr(name
->data
, '/');
1156 v9fs_string_sprintf(&v9stat
->name
, "%s", str
);
1159 v9fs_string_size(&v9stat
->name
) +
1160 v9fs_string_size(&v9stat
->uid
) +
1161 v9fs_string_size(&v9stat
->gid
) +
1162 v9fs_string_size(&v9stat
->muid
) +
1163 v9fs_string_size(&v9stat
->extension
);
1167 #define P9_STATS_MODE 0x00000001ULL
1168 #define P9_STATS_NLINK 0x00000002ULL
1169 #define P9_STATS_UID 0x00000004ULL
1170 #define P9_STATS_GID 0x00000008ULL
1171 #define P9_STATS_RDEV 0x00000010ULL
1172 #define P9_STATS_ATIME 0x00000020ULL
1173 #define P9_STATS_MTIME 0x00000040ULL
1174 #define P9_STATS_CTIME 0x00000080ULL
1175 #define P9_STATS_INO 0x00000100ULL
1176 #define P9_STATS_SIZE 0x00000200ULL
1177 #define P9_STATS_BLOCKS 0x00000400ULL
1179 #define P9_STATS_BTIME 0x00000800ULL
1180 #define P9_STATS_GEN 0x00001000ULL
1181 #define P9_STATS_DATA_VERSION 0x00002000ULL
1183 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
1184 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
1187 static void stat_to_v9stat_dotl(V9fsState
*s
, const struct stat
*stbuf
,
1188 V9fsStatDotl
*v9lstat
)
1190 memset(v9lstat
, 0, sizeof(*v9lstat
));
1192 v9lstat
->st_mode
= stbuf
->st_mode
;
1193 v9lstat
->st_nlink
= stbuf
->st_nlink
;
1194 v9lstat
->st_uid
= stbuf
->st_uid
;
1195 v9lstat
->st_gid
= stbuf
->st_gid
;
1196 v9lstat
->st_rdev
= stbuf
->st_rdev
;
1197 v9lstat
->st_size
= stbuf
->st_size
;
1198 v9lstat
->st_blksize
= stbuf
->st_blksize
;
1199 v9lstat
->st_blocks
= stbuf
->st_blocks
;
1200 v9lstat
->st_atime_sec
= stbuf
->st_atime
;
1201 v9lstat
->st_atime_nsec
= stbuf
->st_atim
.tv_nsec
;
1202 v9lstat
->st_mtime_sec
= stbuf
->st_mtime
;
1203 v9lstat
->st_mtime_nsec
= stbuf
->st_mtim
.tv_nsec
;
1204 v9lstat
->st_ctime_sec
= stbuf
->st_ctime
;
1205 v9lstat
->st_ctime_nsec
= stbuf
->st_ctim
.tv_nsec
;
1206 /* Currently we only support BASIC fields in stat */
1207 v9lstat
->st_result_mask
= P9_STATS_BASIC
;
1209 stat_to_qid(stbuf
, &v9lstat
->qid
);
1212 static struct iovec
*adjust_sg(struct iovec
*sg
, int len
, int *iovcnt
)
1214 while (len
&& *iovcnt
) {
1215 if (len
< sg
->iov_len
) {
1217 sg
->iov_base
+= len
;
1229 static struct iovec
*cap_sg(struct iovec
*sg
, int cap
, int *cnt
)
1234 for (i
= 0; i
< *cnt
; i
++) {
1235 if ((total
+ sg
[i
].iov_len
) > cap
) {
1236 sg
[i
].iov_len
-= ((total
+ sg
[i
].iov_len
) - cap
);
1240 total
+= sg
[i
].iov_len
;
1248 static void print_sg(struct iovec
*sg
, int cnt
)
1252 printf("sg[%d]: {", cnt
);
1253 for (i
= 0; i
< cnt
; i
++) {
1257 printf("(%p, %zd)", sg
[i
].iov_base
, sg
[i
].iov_len
);
1262 /* Will call this only for path name based fid */
1263 static void v9fs_fix_path(V9fsPath
*dst
, V9fsPath
*src
, int len
)
1266 v9fs_path_init(&str
);
1267 v9fs_path_copy(&str
, dst
);
1268 v9fs_string_sprintf((V9fsString
*)dst
, "%s%s", src
->data
, str
.data
+len
);
1269 v9fs_path_free(&str
);
1270 /* +1 to include terminating NULL */
1274 static inline bool is_ro_export(FsContext
*ctx
)
1276 return ctx
->export_flags
& V9FS_RDONLY
;
1279 static void v9fs_version(void *opaque
)
1281 V9fsPDU
*pdu
= opaque
;
1282 V9fsState
*s
= pdu
->s
;
1286 pdu_unmarshal(pdu
, offset
, "ds", &s
->msize
, &version
);
1287 trace_v9fs_version(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
1289 if (!strcmp(version
.data
, "9P2000.u")) {
1290 s
->proto_version
= V9FS_PROTO_2000U
;
1291 } else if (!strcmp(version
.data
, "9P2000.L")) {
1292 s
->proto_version
= V9FS_PROTO_2000L
;
1294 v9fs_string_sprintf(&version
, "unknown");
1297 offset
+= pdu_marshal(pdu
, offset
, "ds", s
->msize
, &version
);
1298 trace_v9fs_version_return(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
1300 complete_pdu(s
, pdu
, offset
);
1302 v9fs_string_free(&version
);
1306 static void v9fs_attach(void *opaque
)
1308 V9fsPDU
*pdu
= opaque
;
1309 V9fsState
*s
= pdu
->s
;
1310 int32_t fid
, afid
, n_uname
;
1311 V9fsString uname
, aname
;
1317 pdu_unmarshal(pdu
, offset
, "ddssd", &fid
, &afid
, &uname
, &aname
, &n_uname
);
1318 trace_v9fs_attach(pdu
->tag
, pdu
->id
, fid
, afid
, uname
.data
, aname
.data
);
1320 fidp
= alloc_fid(s
, fid
);
1325 fidp
->uid
= n_uname
;
1326 err
= v9fs_co_name_to_path(pdu
, NULL
, "/", &fidp
->path
);
1332 err
= fid_to_qid(pdu
, fidp
, &qid
);
1338 offset
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
1340 trace_v9fs_attach_return(pdu
->tag
, pdu
->id
,
1341 qid
.type
, qid
.version
, qid
.path
);
1345 complete_pdu(s
, pdu
, err
);
1346 v9fs_string_free(&uname
);
1347 v9fs_string_free(&aname
);
1350 static void v9fs_stat(void *opaque
)
1358 V9fsPDU
*pdu
= opaque
;
1359 V9fsState
*s
= pdu
->s
;
1361 pdu_unmarshal(pdu
, offset
, "d", &fid
);
1362 trace_v9fs_stat(pdu
->tag
, pdu
->id
, fid
);
1364 fidp
= get_fid(pdu
, fid
);
1369 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1373 err
= stat_to_v9stat(pdu
, &fidp
->path
, &stbuf
, &v9stat
);
1377 offset
+= pdu_marshal(pdu
, offset
, "wS", 0, &v9stat
);
1379 trace_v9fs_stat_return(pdu
->tag
, pdu
->id
, v9stat
.mode
,
1380 v9stat
.atime
, v9stat
.mtime
, v9stat
.length
);
1381 v9fs_stat_free(&v9stat
);
1385 complete_pdu(s
, pdu
, err
);
1388 static void v9fs_getattr(void *opaque
)
1395 uint64_t request_mask
;
1396 V9fsStatDotl v9stat_dotl
;
1397 V9fsPDU
*pdu
= opaque
;
1398 V9fsState
*s
= pdu
->s
;
1400 pdu_unmarshal(pdu
, offset
, "dq", &fid
, &request_mask
);
1401 trace_v9fs_getattr(pdu
->tag
, pdu
->id
, fid
, request_mask
);
1403 fidp
= get_fid(pdu
, fid
);
1409 * Currently we only support BASIC fields in stat, so there is no
1410 * need to look at request_mask.
1412 retval
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1416 stat_to_v9stat_dotl(s
, &stbuf
, &v9stat_dotl
);
1418 /* fill st_gen if requested and supported by underlying fs */
1419 if (request_mask
& P9_STATS_GEN
) {
1420 retval
= v9fs_co_st_gen(pdu
, &fidp
->path
, stbuf
.st_mode
, &v9stat_dotl
);
1424 v9stat_dotl
.st_result_mask
|= P9_STATS_GEN
;
1427 retval
+= pdu_marshal(pdu
, offset
, "A", &v9stat_dotl
);
1428 trace_v9fs_getattr_return(pdu
->tag
, pdu
->id
, v9stat_dotl
.st_result_mask
,
1429 v9stat_dotl
.st_mode
, v9stat_dotl
.st_uid
,
1430 v9stat_dotl
.st_gid
);
1434 complete_pdu(s
, pdu
, retval
);
1437 /* From Linux kernel code */
1438 #define ATTR_MODE (1 << 0)
1439 #define ATTR_UID (1 << 1)
1440 #define ATTR_GID (1 << 2)
1441 #define ATTR_SIZE (1 << 3)
1442 #define ATTR_ATIME (1 << 4)
1443 #define ATTR_MTIME (1 << 5)
1444 #define ATTR_CTIME (1 << 6)
1445 #define ATTR_MASK 127
1446 #define ATTR_ATIME_SET (1 << 7)
1447 #define ATTR_MTIME_SET (1 << 8)
1449 static void v9fs_setattr(void *opaque
)
1456 V9fsPDU
*pdu
= opaque
;
1457 V9fsState
*s
= pdu
->s
;
1459 pdu_unmarshal(pdu
, offset
, "dI", &fid
, &v9iattr
);
1461 fidp
= get_fid(pdu
, fid
);
1466 if (v9iattr
.valid
& ATTR_MODE
) {
1467 err
= v9fs_co_chmod(pdu
, &fidp
->path
, v9iattr
.mode
);
1472 if (v9iattr
.valid
& (ATTR_ATIME
| ATTR_MTIME
)) {
1473 struct timespec times
[2];
1474 if (v9iattr
.valid
& ATTR_ATIME
) {
1475 if (v9iattr
.valid
& ATTR_ATIME_SET
) {
1476 times
[0].tv_sec
= v9iattr
.atime_sec
;
1477 times
[0].tv_nsec
= v9iattr
.atime_nsec
;
1479 times
[0].tv_nsec
= UTIME_NOW
;
1482 times
[0].tv_nsec
= UTIME_OMIT
;
1484 if (v9iattr
.valid
& ATTR_MTIME
) {
1485 if (v9iattr
.valid
& ATTR_MTIME_SET
) {
1486 times
[1].tv_sec
= v9iattr
.mtime_sec
;
1487 times
[1].tv_nsec
= v9iattr
.mtime_nsec
;
1489 times
[1].tv_nsec
= UTIME_NOW
;
1492 times
[1].tv_nsec
= UTIME_OMIT
;
1494 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
1500 * If the only valid entry in iattr is ctime we can call
1501 * chown(-1,-1) to update the ctime of the file
1503 if ((v9iattr
.valid
& (ATTR_UID
| ATTR_GID
)) ||
1504 ((v9iattr
.valid
& ATTR_CTIME
)
1505 && !((v9iattr
.valid
& ATTR_MASK
) & ~ATTR_CTIME
))) {
1506 if (!(v9iattr
.valid
& ATTR_UID
)) {
1509 if (!(v9iattr
.valid
& ATTR_GID
)) {
1512 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9iattr
.uid
,
1518 if (v9iattr
.valid
& (ATTR_SIZE
)) {
1519 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9iattr
.size
);
1528 complete_pdu(s
, pdu
, err
);
1531 static int v9fs_walk_marshal(V9fsPDU
*pdu
, uint16_t nwnames
, V9fsQID
*qids
)
1535 offset
+= pdu_marshal(pdu
, offset
, "w", nwnames
);
1536 for (i
= 0; i
< nwnames
; i
++) {
1537 offset
+= pdu_marshal(pdu
, offset
, "Q", &qids
[i
]);
1542 static void v9fs_walk(void *opaque
)
1545 V9fsQID
*qids
= NULL
;
1547 V9fsPath dpath
, path
;
1551 int32_t fid
, newfid
;
1552 V9fsString
*wnames
= NULL
;
1554 V9fsFidState
*newfidp
= NULL
;;
1555 V9fsPDU
*pdu
= opaque
;
1556 V9fsState
*s
= pdu
->s
;
1558 offset
+= pdu_unmarshal(pdu
, offset
, "ddw", &fid
,
1561 trace_v9fs_walk(pdu
->tag
, pdu
->id
, fid
, newfid
, nwnames
);
1563 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1564 wnames
= g_malloc0(sizeof(wnames
[0]) * nwnames
);
1565 qids
= g_malloc0(sizeof(qids
[0]) * nwnames
);
1566 for (i
= 0; i
< nwnames
; i
++) {
1567 offset
+= pdu_unmarshal(pdu
, offset
, "s", &wnames
[i
]);
1569 } else if (nwnames
> P9_MAXWELEM
) {
1573 fidp
= get_fid(pdu
, fid
);
1578 v9fs_path_init(&dpath
);
1579 v9fs_path_init(&path
);
1581 * Both dpath and path initially poin to fidp.
1582 * Needed to handle request with nwnames == 0
1584 v9fs_path_copy(&dpath
, &fidp
->path
);
1585 v9fs_path_copy(&path
, &fidp
->path
);
1586 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1587 err
= v9fs_co_name_to_path(pdu
, &dpath
, wnames
[name_idx
].data
, &path
);
1591 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1595 stat_to_qid(&stbuf
, &qids
[name_idx
]);
1596 v9fs_path_copy(&dpath
, &path
);
1598 if (fid
== newfid
) {
1599 BUG_ON(fidp
->fid_type
!= P9_FID_NONE
);
1600 v9fs_path_copy(&fidp
->path
, &path
);
1602 newfidp
= alloc_fid(s
, newfid
);
1603 if (newfidp
== NULL
) {
1607 newfidp
->uid
= fidp
->uid
;
1608 v9fs_path_copy(&newfidp
->path
, &path
);
1610 err
= v9fs_walk_marshal(pdu
, nwnames
, qids
);
1611 trace_v9fs_walk_return(pdu
->tag
, pdu
->id
, nwnames
, qids
);
1615 put_fid(pdu
, newfidp
);
1617 v9fs_path_free(&dpath
);
1618 v9fs_path_free(&path
);
1620 complete_pdu(s
, pdu
, err
);
1621 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1622 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1623 v9fs_string_free(&wnames
[name_idx
]);
1631 static int32_t get_iounit(V9fsPDU
*pdu
, V9fsPath
*path
)
1633 struct statfs stbuf
;
1635 V9fsState
*s
= pdu
->s
;
1638 * iounit should be multiples of f_bsize (host filesystem block size
1639 * and as well as less than (client msize - P9_IOHDRSZ))
1641 if (!v9fs_co_statfs(pdu
, path
, &stbuf
)) {
1642 iounit
= stbuf
.f_bsize
;
1643 iounit
*= (s
->msize
- P9_IOHDRSZ
)/stbuf
.f_bsize
;
1646 iounit
= s
->msize
- P9_IOHDRSZ
;
1651 static void v9fs_open(void *opaque
)
1662 V9fsPDU
*pdu
= opaque
;
1663 V9fsState
*s
= pdu
->s
;
1665 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1666 pdu_unmarshal(pdu
, offset
, "dd", &fid
, &mode
);
1668 pdu_unmarshal(pdu
, offset
, "db", &fid
, &mode
);
1670 trace_v9fs_open(pdu
->tag
, pdu
->id
, fid
, mode
);
1672 fidp
= get_fid(pdu
, fid
);
1677 BUG_ON(fidp
->fid_type
!= P9_FID_NONE
);
1679 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1683 stat_to_qid(&stbuf
, &qid
);
1684 if (S_ISDIR(stbuf
.st_mode
)) {
1685 err
= v9fs_co_opendir(pdu
, fidp
);
1689 fidp
->fid_type
= P9_FID_DIR
;
1690 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, 0);
1693 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1694 flags
= get_dotl_openflags(s
, mode
);
1696 flags
= omode_to_uflags(mode
);
1698 if (is_ro_export(&s
->ctx
)) {
1699 if (mode
& O_WRONLY
|| mode
& O_RDWR
||
1700 mode
& O_APPEND
|| mode
& O_TRUNC
) {
1706 err
= v9fs_co_open(pdu
, fidp
, flags
);
1710 fidp
->fid_type
= P9_FID_FILE
;
1711 fidp
->open_flags
= flags
;
1712 if (flags
& O_EXCL
) {
1714 * We let the host file system do O_EXCL check
1715 * We should not reclaim such fd
1717 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1719 iounit
= get_iounit(pdu
, &fidp
->path
);
1720 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1723 trace_v9fs_open_return(pdu
->tag
, pdu
->id
,
1724 qid
.type
, qid
.version
, qid
.path
, iounit
);
1728 complete_pdu(s
, pdu
, err
);
1731 static void v9fs_lcreate(void *opaque
)
1733 int32_t dfid
, flags
, mode
;
1742 V9fsPDU
*pdu
= opaque
;
1744 pdu_unmarshal(pdu
, offset
, "dsddd", &dfid
, &name
, &flags
,
1746 trace_v9fs_lcreate(pdu
->tag
, pdu
->id
, dfid
, flags
, mode
, gid
);
1748 fidp
= get_fid(pdu
, dfid
);
1754 flags
= get_dotl_openflags(pdu
->s
, flags
);
1755 err
= v9fs_co_open2(pdu
, fidp
, &name
, gid
,
1756 flags
| O_CREAT
, mode
, &stbuf
);
1760 fidp
->fid_type
= P9_FID_FILE
;
1761 fidp
->open_flags
= flags
;
1762 if (flags
& O_EXCL
) {
1764 * We let the host file system do O_EXCL check
1765 * We should not reclaim such fd
1767 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1769 iounit
= get_iounit(pdu
, &fidp
->path
);
1770 stat_to_qid(&stbuf
, &qid
);
1771 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1773 trace_v9fs_lcreate_return(pdu
->tag
, pdu
->id
,
1774 qid
.type
, qid
.version
, qid
.path
, iounit
);
1778 complete_pdu(pdu
->s
, pdu
, err
);
1779 v9fs_string_free(&name
);
1782 static void v9fs_fsync(void *opaque
)
1789 V9fsPDU
*pdu
= opaque
;
1790 V9fsState
*s
= pdu
->s
;
1792 pdu_unmarshal(pdu
, offset
, "dd", &fid
, &datasync
);
1793 trace_v9fs_fsync(pdu
->tag
, pdu
->id
, fid
, datasync
);
1795 fidp
= get_fid(pdu
, fid
);
1800 err
= v9fs_co_fsync(pdu
, fidp
, datasync
);
1806 complete_pdu(s
, pdu
, err
);
1809 static void v9fs_clunk(void *opaque
)
1815 V9fsPDU
*pdu
= opaque
;
1816 V9fsState
*s
= pdu
->s
;
1818 pdu_unmarshal(pdu
, offset
, "d", &fid
);
1819 trace_v9fs_clunk(pdu
->tag
, pdu
->id
, fid
);
1821 fidp
= clunk_fid(s
, fid
);
1827 * Bump the ref so that put_fid will
1835 complete_pdu(s
, pdu
, err
);
1838 static int v9fs_xattr_read(V9fsState
*s
, V9fsPDU
*pdu
,
1839 V9fsFidState
*fidp
, int64_t off
, int32_t max_count
)
1845 xattr_len
= fidp
->fs
.xattr
.len
;
1846 read_count
= xattr_len
- off
;
1847 if (read_count
> max_count
) {
1848 read_count
= max_count
;
1849 } else if (read_count
< 0) {
1851 * read beyond XATTR value
1855 offset
+= pdu_marshal(pdu
, offset
, "d", read_count
);
1856 offset
+= pdu_pack(pdu
, offset
,
1857 ((char *)fidp
->fs
.xattr
.value
) + off
,
1862 static int v9fs_do_readdir_with_stat(V9fsPDU
*pdu
,
1863 V9fsFidState
*fidp
, int32_t max_count
)
1870 off_t saved_dir_pos
;
1871 struct dirent
*dent
, *result
;
1873 /* save the directory position */
1874 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
1875 if (saved_dir_pos
< 0) {
1876 return saved_dir_pos
;
1879 dent
= g_malloc(sizeof(struct dirent
));
1882 v9fs_path_init(&path
);
1883 err
= v9fs_co_readdir_r(pdu
, fidp
, dent
, &result
);
1884 if (err
|| !result
) {
1887 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, dent
->d_name
, &path
);
1891 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1895 err
= stat_to_v9stat(pdu
, &path
, &stbuf
, &v9stat
);
1899 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1900 len
= pdu_marshal(pdu
, 11 + count
, "S", &v9stat
);
1901 if ((len
!= (v9stat
.size
+ 2)) || ((count
+ len
) > max_count
)) {
1902 /* Ran out of buffer. Set dir back to old position and return */
1903 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
1904 v9fs_stat_free(&v9stat
);
1905 v9fs_path_free(&path
);
1910 v9fs_stat_free(&v9stat
);
1911 v9fs_path_free(&path
);
1912 saved_dir_pos
= dent
->d_off
;
1916 v9fs_path_free(&path
);
1923 static void v9fs_read(void *opaque
)
1932 V9fsPDU
*pdu
= opaque
;
1933 V9fsState
*s
= pdu
->s
;
1935 pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &max_count
);
1936 trace_v9fs_read(pdu
->tag
, pdu
->id
, fid
, off
, max_count
);
1938 fidp
= get_fid(pdu
, fid
);
1943 if (fidp
->fid_type
== P9_FID_DIR
) {
1946 v9fs_co_rewinddir(pdu
, fidp
);
1948 count
= v9fs_do_readdir_with_stat(pdu
, fidp
, max_count
);
1954 err
+= pdu_marshal(pdu
, offset
, "d", count
);
1956 } else if (fidp
->fid_type
== P9_FID_FILE
) {
1960 struct iovec iov
[128]; /* FIXME: bad, bad, bad */
1963 pdu_marshal(pdu
, offset
+ 4, "v", sg
, &cnt
);
1964 sg
= cap_sg(sg
, max_count
, &cnt
);
1969 /* Loop in case of EINTR */
1971 len
= v9fs_co_preadv(pdu
, fidp
, sg
, cnt
, off
);
1976 } while (len
== -EINTR
&& !pdu
->cancelled
);
1978 /* IO error return the error */
1982 sg
= adjust_sg(sg
, len
, &cnt
);
1983 } while (count
< max_count
&& len
> 0);
1985 err
+= pdu_marshal(pdu
, offset
, "d", count
);
1987 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
1988 err
= v9fs_xattr_read(s
, pdu
, fidp
, off
, max_count
);
1992 trace_v9fs_read_return(pdu
->tag
, pdu
->id
, count
, err
);
1996 complete_pdu(s
, pdu
, err
);
1999 static size_t v9fs_readdir_data_size(V9fsString
*name
)
2002 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
2003 * size of type (1) + size of name.size (2) + strlen(name.data)
2005 return 24 + v9fs_string_size(name
);
2008 static int v9fs_do_readdir(V9fsPDU
*pdu
,
2009 V9fsFidState
*fidp
, int32_t max_count
)
2016 off_t saved_dir_pos
;
2017 struct dirent
*dent
, *result
;
2019 /* save the directory position */
2020 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
2021 if (saved_dir_pos
< 0) {
2022 return saved_dir_pos
;
2025 dent
= g_malloc(sizeof(struct dirent
));
2028 err
= v9fs_co_readdir_r(pdu
, fidp
, dent
, &result
);
2029 if (err
|| !result
) {
2032 v9fs_string_init(&name
);
2033 v9fs_string_sprintf(&name
, "%s", dent
->d_name
);
2034 if ((count
+ v9fs_readdir_data_size(&name
)) > max_count
) {
2035 /* Ran out of buffer. Set dir back to old position and return */
2036 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
2037 v9fs_string_free(&name
);
2042 * Fill up just the path field of qid because the client uses
2043 * only that. To fill the entire qid structure we will have
2044 * to stat each dirent found, which is expensive
2046 size
= MIN(sizeof(dent
->d_ino
), sizeof(qid
.path
));
2047 memcpy(&qid
.path
, &dent
->d_ino
, size
);
2048 /* Fill the other fields with dummy values */
2052 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
2053 len
= pdu_marshal(pdu
, 11 + count
, "Qqbs",
2055 dent
->d_type
, &name
);
2057 v9fs_string_free(&name
);
2058 saved_dir_pos
= dent
->d_off
;
2067 static void v9fs_readdir(void *opaque
)
2073 int64_t initial_offset
;
2074 int32_t count
, max_count
;
2075 V9fsPDU
*pdu
= opaque
;
2076 V9fsState
*s
= pdu
->s
;
2078 pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &initial_offset
, &max_count
);
2080 trace_v9fs_readdir(pdu
->tag
, pdu
->id
, fid
, initial_offset
, max_count
);
2082 fidp
= get_fid(pdu
, fid
);
2087 if (!fidp
->fs
.dir
) {
2091 if (initial_offset
== 0) {
2092 v9fs_co_rewinddir(pdu
, fidp
);
2094 v9fs_co_seekdir(pdu
, fidp
, initial_offset
);
2096 count
= v9fs_do_readdir(pdu
, fidp
, max_count
);
2102 retval
+= pdu_marshal(pdu
, offset
, "d", count
);
2104 trace_v9fs_readdir_return(pdu
->tag
, pdu
->id
, count
, retval
);
2108 complete_pdu(s
, pdu
, retval
);
2111 static int v9fs_xattr_write(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2112 int64_t off
, int32_t count
,
2113 struct iovec
*sg
, int cnt
)
2122 xattr_len
= fidp
->fs
.xattr
.len
;
2123 write_count
= xattr_len
- off
;
2124 if (write_count
> count
) {
2125 write_count
= count
;
2126 } else if (write_count
< 0) {
2128 * write beyond XATTR value len specified in
2134 offset
+= pdu_marshal(pdu
, offset
, "d", write_count
);
2136 fidp
->fs
.xattr
.copied_len
+= write_count
;
2138 * Now copy the content from sg list
2140 for (i
= 0; i
< cnt
; i
++) {
2141 if (write_count
> sg
[i
].iov_len
) {
2142 to_copy
= sg
[i
].iov_len
;
2144 to_copy
= write_count
;
2146 memcpy((char *)fidp
->fs
.xattr
.value
+ off
, sg
[i
].iov_base
, to_copy
);
2147 /* updating vs->off since we are not using below */
2149 write_count
-= to_copy
;
2155 static void v9fs_write(void *opaque
)
2166 struct iovec iov
[128]; /* FIXME: bad, bad, bad */
2167 struct iovec
*sg
= iov
;
2168 V9fsPDU
*pdu
= opaque
;
2169 V9fsState
*s
= pdu
->s
;
2171 pdu_unmarshal(pdu
, offset
, "dqdv", &fid
, &off
, &count
, sg
, &cnt
);
2172 trace_v9fs_write(pdu
->tag
, pdu
->id
, fid
, off
, count
, cnt
);
2174 fidp
= get_fid(pdu
, fid
);
2179 if (fidp
->fid_type
== P9_FID_FILE
) {
2180 if (fidp
->fs
.fd
== -1) {
2184 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
2186 * setxattr operation
2188 err
= v9fs_xattr_write(s
, pdu
, fidp
, off
, count
, sg
, cnt
);
2194 sg
= cap_sg(sg
, count
, &cnt
);
2199 /* Loop in case of EINTR */
2201 len
= v9fs_co_pwritev(pdu
, fidp
, sg
, cnt
, off
);
2206 } while (len
== -EINTR
&& !pdu
->cancelled
);
2208 /* IO error return the error */
2212 sg
= adjust_sg(sg
, len
, &cnt
);
2213 } while (total
< count
&& len
> 0);
2214 offset
+= pdu_marshal(pdu
, offset
, "d", total
);
2216 trace_v9fs_write_return(pdu
->tag
, pdu
->id
, total
, err
);
2220 complete_pdu(s
, pdu
, err
);
2223 static void v9fs_create(void *opaque
)
2235 V9fsString extension
;
2237 V9fsPDU
*pdu
= opaque
;
2239 v9fs_path_init(&path
);
2241 pdu_unmarshal(pdu
, offset
, "dsdbs", &fid
, &name
,
2242 &perm
, &mode
, &extension
);
2244 trace_v9fs_create(pdu
->tag
, pdu
->id
, fid
, name
.data
, perm
, mode
);
2246 fidp
= get_fid(pdu
, fid
);
2251 if (perm
& P9_STAT_MODE_DIR
) {
2252 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, perm
& 0777,
2253 fidp
->uid
, -1, &stbuf
);
2257 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2261 v9fs_path_copy(&fidp
->path
, &path
);
2262 err
= v9fs_co_opendir(pdu
, fidp
);
2266 fidp
->fid_type
= P9_FID_DIR
;
2267 } else if (perm
& P9_STAT_MODE_SYMLINK
) {
2268 err
= v9fs_co_symlink(pdu
, fidp
, &name
,
2269 extension
.data
, -1 , &stbuf
);
2273 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2277 v9fs_path_copy(&fidp
->path
, &path
);
2278 } else if (perm
& P9_STAT_MODE_LINK
) {
2279 int32_t ofid
= atoi(extension
.data
);
2280 V9fsFidState
*ofidp
= get_fid(pdu
, ofid
);
2281 if (ofidp
== NULL
) {
2285 err
= v9fs_co_link(pdu
, ofidp
, fidp
, &name
);
2286 put_fid(pdu
, ofidp
);
2290 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2292 fidp
->fid_type
= P9_FID_NONE
;
2295 v9fs_path_copy(&fidp
->path
, &path
);
2296 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2298 fidp
->fid_type
= P9_FID_NONE
;
2301 } else if (perm
& P9_STAT_MODE_DEVICE
) {
2303 uint32_t major
, minor
;
2306 if (sscanf(extension
.data
, "%c %u %u", &ctype
, &major
, &minor
) != 3) {
2323 nmode
|= perm
& 0777;
2324 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2325 makedev(major
, minor
), nmode
, &stbuf
);
2329 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2333 v9fs_path_copy(&fidp
->path
, &path
);
2334 } else if (perm
& P9_STAT_MODE_NAMED_PIPE
) {
2335 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2336 0, S_IFIFO
| (perm
& 0777), &stbuf
);
2340 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2344 v9fs_path_copy(&fidp
->path
, &path
);
2345 } else if (perm
& P9_STAT_MODE_SOCKET
) {
2346 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2347 0, S_IFSOCK
| (perm
& 0777), &stbuf
);
2351 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2355 v9fs_path_copy(&fidp
->path
, &path
);
2357 err
= v9fs_co_open2(pdu
, fidp
, &name
, -1,
2358 omode_to_uflags(mode
)|O_CREAT
, perm
, &stbuf
);
2362 fidp
->fid_type
= P9_FID_FILE
;
2363 fidp
->open_flags
= omode_to_uflags(mode
);
2364 if (fidp
->open_flags
& O_EXCL
) {
2366 * We let the host file system do O_EXCL check
2367 * We should not reclaim such fd
2369 fidp
->flags
|= FID_NON_RECLAIMABLE
;
2372 iounit
= get_iounit(pdu
, &fidp
->path
);
2373 stat_to_qid(&stbuf
, &qid
);
2374 offset
+= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
2376 trace_v9fs_create_return(pdu
->tag
, pdu
->id
,
2377 qid
.type
, qid
.version
, qid
.path
, iounit
);
2381 complete_pdu(pdu
->s
, pdu
, err
);
2382 v9fs_string_free(&name
);
2383 v9fs_string_free(&extension
);
2384 v9fs_path_free(&path
);
2387 static void v9fs_symlink(void *opaque
)
2389 V9fsPDU
*pdu
= opaque
;
2392 V9fsFidState
*dfidp
;
2400 pdu_unmarshal(pdu
, offset
, "dssd", &dfid
, &name
, &symname
, &gid
);
2401 trace_v9fs_symlink(pdu
->tag
, pdu
->id
, dfid
, name
.data
, symname
.data
, gid
);
2403 dfidp
= get_fid(pdu
, dfid
);
2404 if (dfidp
== NULL
) {
2408 err
= v9fs_co_symlink(pdu
, dfidp
, &name
, symname
.data
, gid
, &stbuf
);
2412 stat_to_qid(&stbuf
, &qid
);
2413 offset
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
2415 trace_v9fs_symlink_return(pdu
->tag
, pdu
->id
,
2416 qid
.type
, qid
.version
, qid
.path
);
2418 put_fid(pdu
, dfidp
);
2420 complete_pdu(pdu
->s
, pdu
, err
);
2421 v9fs_string_free(&name
);
2422 v9fs_string_free(&symname
);
2425 static void v9fs_flush(void *opaque
)
2429 V9fsPDU
*cancel_pdu
;
2430 V9fsPDU
*pdu
= opaque
;
2431 V9fsState
*s
= pdu
->s
;
2433 pdu_unmarshal(pdu
, offset
, "w", &tag
);
2434 trace_v9fs_flush(pdu
->tag
, pdu
->id
, tag
);
2436 QLIST_FOREACH(cancel_pdu
, &s
->active_list
, next
) {
2437 if (cancel_pdu
->tag
== tag
) {
2442 cancel_pdu
->cancelled
= 1;
2444 * Wait for pdu to complete.
2446 qemu_co_queue_wait(&cancel_pdu
->complete
);
2447 cancel_pdu
->cancelled
= 0;
2448 free_pdu(pdu
->s
, cancel_pdu
);
2450 complete_pdu(s
, pdu
, 7);
2454 static void v9fs_link(void *opaque
)
2456 V9fsPDU
*pdu
= opaque
;
2457 V9fsState
*s
= pdu
->s
;
2458 int32_t dfid
, oldfid
;
2459 V9fsFidState
*dfidp
, *oldfidp
;
2464 pdu_unmarshal(pdu
, offset
, "dds", &dfid
, &oldfid
, &name
);
2465 trace_v9fs_link(pdu
->tag
, pdu
->id
, dfid
, oldfid
, name
.data
);
2467 dfidp
= get_fid(pdu
, dfid
);
2468 if (dfidp
== NULL
) {
2473 oldfidp
= get_fid(pdu
, oldfid
);
2474 if (oldfidp
== NULL
) {
2478 err
= v9fs_co_link(pdu
, oldfidp
, dfidp
, &name
);
2483 put_fid(pdu
, dfidp
);
2485 v9fs_string_free(&name
);
2486 complete_pdu(s
, pdu
, err
);
2489 /* Only works with path name based fid */
2490 static void v9fs_remove(void *opaque
)
2496 V9fsPDU
*pdu
= opaque
;
2498 pdu_unmarshal(pdu
, offset
, "d", &fid
);
2499 trace_v9fs_remove(pdu
->tag
, pdu
->id
, fid
);
2501 fidp
= get_fid(pdu
, fid
);
2506 /* if fs driver is not path based, return EOPNOTSUPP */
2507 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2512 * IF the file is unlinked, we cannot reopen
2513 * the file later. So don't reclaim fd
2515 err
= v9fs_mark_fids_unreclaim(pdu
, &fidp
->path
);
2519 err
= v9fs_co_remove(pdu
, &fidp
->path
);
2524 /* For TREMOVE we need to clunk the fid even on failed remove */
2525 clunk_fid(pdu
->s
, fidp
->fid
);
2528 complete_pdu(pdu
->s
, pdu
, err
);
2531 static void v9fs_unlinkat(void *opaque
)
2535 int32_t dfid
, flags
;
2538 V9fsFidState
*dfidp
;
2539 V9fsPDU
*pdu
= opaque
;
2541 pdu_unmarshal(pdu
, offset
, "dsd", &dfid
, &name
, &flags
);
2542 flags
= dotl_to_at_flags(flags
);
2544 dfidp
= get_fid(pdu
, dfid
);
2545 if (dfidp
== NULL
) {
2550 * IF the file is unlinked, we cannot reopen
2551 * the file later. So don't reclaim fd
2553 v9fs_path_init(&path
);
2554 err
= v9fs_co_name_to_path(pdu
, &dfidp
->path
, name
.data
, &path
);
2558 err
= v9fs_mark_fids_unreclaim(pdu
, &path
);
2562 err
= v9fs_co_unlinkat(pdu
, &dfidp
->path
, &name
, flags
);
2567 put_fid(pdu
, dfidp
);
2568 v9fs_path_free(&path
);
2570 complete_pdu(pdu
->s
, pdu
, err
);
2571 v9fs_string_free(&name
);
2575 /* Only works with path name based fid */
2576 static int v9fs_complete_rename(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2577 int32_t newdirfid
, V9fsString
*name
)
2582 V9fsFidState
*tfidp
;
2583 V9fsState
*s
= pdu
->s
;
2584 V9fsFidState
*dirfidp
= NULL
;
2585 char *old_name
, *new_name
;
2587 v9fs_path_init(&new_path
);
2588 if (newdirfid
!= -1) {
2589 dirfidp
= get_fid(pdu
, newdirfid
);
2590 if (dirfidp
== NULL
) {
2594 BUG_ON(dirfidp
->fid_type
!= P9_FID_NONE
);
2595 v9fs_co_name_to_path(pdu
, &dirfidp
->path
, name
->data
, &new_path
);
2597 old_name
= fidp
->path
.data
;
2598 end
= strrchr(old_name
, '/');
2604 new_name
= g_malloc0(end
- old_name
+ name
->size
+ 1);
2605 strncat(new_name
, old_name
, end
- old_name
);
2606 strncat(new_name
+ (end
- old_name
), name
->data
, name
->size
);
2607 v9fs_co_name_to_path(pdu
, NULL
, new_name
, &new_path
);
2610 err
= v9fs_co_rename(pdu
, &fidp
->path
, &new_path
);
2615 * Fixup fid's pointing to the old name to
2616 * start pointing to the new name
2618 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2619 if (v9fs_path_is_ancestor(&fidp
->path
, &tfidp
->path
)) {
2620 /* replace the name */
2621 v9fs_fix_path(&tfidp
->path
, &new_path
, strlen(fidp
->path
.data
));
2626 put_fid(pdu
, dirfidp
);
2628 v9fs_path_free(&new_path
);
2633 /* Only works with path name based fid */
2634 static void v9fs_rename(void *opaque
)
2642 V9fsPDU
*pdu
= opaque
;
2643 V9fsState
*s
= pdu
->s
;
2645 pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newdirfid
, &name
);
2647 fidp
= get_fid(pdu
, fid
);
2652 BUG_ON(fidp
->fid_type
!= P9_FID_NONE
);
2653 /* if fs driver is not path based, return EOPNOTSUPP */
2654 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2658 v9fs_path_write_lock(s
);
2659 err
= v9fs_complete_rename(pdu
, fidp
, newdirfid
, &name
);
2660 v9fs_path_unlock(s
);
2667 complete_pdu(s
, pdu
, err
);
2668 v9fs_string_free(&name
);
2671 static void v9fs_fix_fid_paths(V9fsPDU
*pdu
, V9fsPath
*olddir
,
2672 V9fsString
*old_name
, V9fsPath
*newdir
,
2673 V9fsString
*new_name
)
2675 V9fsFidState
*tfidp
;
2676 V9fsPath oldpath
, newpath
;
2677 V9fsState
*s
= pdu
->s
;
2680 v9fs_path_init(&oldpath
);
2681 v9fs_path_init(&newpath
);
2682 v9fs_co_name_to_path(pdu
, olddir
, old_name
->data
, &oldpath
);
2683 v9fs_co_name_to_path(pdu
, newdir
, new_name
->data
, &newpath
);
2686 * Fixup fid's pointing to the old name to
2687 * start pointing to the new name
2689 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
2690 if (v9fs_path_is_ancestor(&oldpath
, &tfidp
->path
)) {
2691 /* replace the name */
2692 v9fs_fix_path(&tfidp
->path
, &newpath
, strlen(oldpath
.data
));
2695 v9fs_path_free(&oldpath
);
2696 v9fs_path_free(&newpath
);
2699 static int v9fs_complete_renameat(V9fsPDU
*pdu
, int32_t olddirfid
,
2700 V9fsString
*old_name
, int32_t newdirfid
,
2701 V9fsString
*new_name
)
2704 V9fsState
*s
= pdu
->s
;
2705 V9fsFidState
*newdirfidp
= NULL
, *olddirfidp
= NULL
;
2707 olddirfidp
= get_fid(pdu
, olddirfid
);
2708 if (olddirfidp
== NULL
) {
2712 if (newdirfid
!= -1) {
2713 newdirfidp
= get_fid(pdu
, newdirfid
);
2714 if (newdirfidp
== NULL
) {
2719 newdirfidp
= get_fid(pdu
, olddirfid
);
2722 err
= v9fs_co_renameat(pdu
, &olddirfidp
->path
, old_name
,
2723 &newdirfidp
->path
, new_name
);
2727 if (s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
) {
2728 /* Only for path based fid we need to do the below fixup */
2729 v9fs_fix_fid_paths(pdu
, &olddirfidp
->path
, old_name
,
2730 &newdirfidp
->path
, new_name
);
2734 put_fid(pdu
, olddirfidp
);
2737 put_fid(pdu
, newdirfidp
);
2742 static void v9fs_renameat(void *opaque
)
2746 V9fsPDU
*pdu
= opaque
;
2747 V9fsState
*s
= pdu
->s
;
2748 int32_t olddirfid
, newdirfid
;
2749 V9fsString old_name
, new_name
;
2751 pdu_unmarshal(pdu
, offset
, "dsds", &olddirfid
,
2752 &old_name
, &newdirfid
, &new_name
);
2754 v9fs_path_write_lock(s
);
2755 err
= v9fs_complete_renameat(pdu
, olddirfid
,
2756 &old_name
, newdirfid
, &new_name
);
2757 v9fs_path_unlock(s
);
2761 complete_pdu(s
, pdu
, err
);
2762 v9fs_string_free(&old_name
);
2763 v9fs_string_free(&new_name
);
2766 static void v9fs_wstat(void *opaque
)
2775 V9fsPDU
*pdu
= opaque
;
2776 V9fsState
*s
= pdu
->s
;
2778 pdu_unmarshal(pdu
, offset
, "dwS", &fid
, &unused
, &v9stat
);
2779 trace_v9fs_wstat(pdu
->tag
, pdu
->id
, fid
,
2780 v9stat
.mode
, v9stat
.atime
, v9stat
.mtime
);
2782 fidp
= get_fid(pdu
, fid
);
2787 /* do we need to sync the file? */
2788 if (donttouch_stat(&v9stat
)) {
2789 err
= v9fs_co_fsync(pdu
, fidp
, 0);
2792 if (v9stat
.mode
!= -1) {
2794 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2798 v9_mode
= stat_to_v9mode(&stbuf
);
2799 if ((v9stat
.mode
& P9_STAT_MODE_TYPE_BITS
) !=
2800 (v9_mode
& P9_STAT_MODE_TYPE_BITS
)) {
2801 /* Attempting to change the type */
2805 err
= v9fs_co_chmod(pdu
, &fidp
->path
,
2806 v9mode_to_mode(v9stat
.mode
,
2807 &v9stat
.extension
));
2812 if (v9stat
.mtime
!= -1 || v9stat
.atime
!= -1) {
2813 struct timespec times
[2];
2814 if (v9stat
.atime
!= -1) {
2815 times
[0].tv_sec
= v9stat
.atime
;
2816 times
[0].tv_nsec
= 0;
2818 times
[0].tv_nsec
= UTIME_OMIT
;
2820 if (v9stat
.mtime
!= -1) {
2821 times
[1].tv_sec
= v9stat
.mtime
;
2822 times
[1].tv_nsec
= 0;
2824 times
[1].tv_nsec
= UTIME_OMIT
;
2826 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
2831 if (v9stat
.n_gid
!= -1 || v9stat
.n_uid
!= -1) {
2832 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9stat
.n_uid
, v9stat
.n_gid
);
2837 if (v9stat
.name
.size
!= 0) {
2838 err
= v9fs_complete_rename(pdu
, fidp
, -1, &v9stat
.name
);
2843 if (v9stat
.length
!= -1) {
2844 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9stat
.length
);
2853 v9fs_stat_free(&v9stat
);
2854 complete_pdu(s
, pdu
, err
);
2857 static int v9fs_fill_statfs(V9fsState
*s
, V9fsPDU
*pdu
, struct statfs
*stbuf
)
2869 int32_t bsize_factor
;
2872 * compute bsize factor based on host file system block size
2875 bsize_factor
= (s
->msize
- P9_IOHDRSZ
)/stbuf
->f_bsize
;
2876 if (!bsize_factor
) {
2879 f_type
= stbuf
->f_type
;
2880 f_bsize
= stbuf
->f_bsize
;
2881 f_bsize
*= bsize_factor
;
2883 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2884 * adjust(divide) the number of blocks, free blocks and available
2885 * blocks by bsize factor
2887 f_blocks
= stbuf
->f_blocks
/bsize_factor
;
2888 f_bfree
= stbuf
->f_bfree
/bsize_factor
;
2889 f_bavail
= stbuf
->f_bavail
/bsize_factor
;
2890 f_files
= stbuf
->f_files
;
2891 f_ffree
= stbuf
->f_ffree
;
2892 fsid_val
= (unsigned int) stbuf
->f_fsid
.__val
[0] |
2893 (unsigned long long)stbuf
->f_fsid
.__val
[1] << 32;
2894 f_namelen
= stbuf
->f_namelen
;
2896 return pdu_marshal(pdu
, offset
, "ddqqqqqqd",
2897 f_type
, f_bsize
, f_blocks
, f_bfree
,
2898 f_bavail
, f_files
, f_ffree
,
2899 fsid_val
, f_namelen
);
2902 static void v9fs_statfs(void *opaque
)
2908 struct statfs stbuf
;
2909 V9fsPDU
*pdu
= opaque
;
2910 V9fsState
*s
= pdu
->s
;
2912 pdu_unmarshal(pdu
, offset
, "d", &fid
);
2913 fidp
= get_fid(pdu
, fid
);
2918 retval
= v9fs_co_statfs(pdu
, &fidp
->path
, &stbuf
);
2923 retval
+= v9fs_fill_statfs(s
, pdu
, &stbuf
);
2927 complete_pdu(s
, pdu
, retval
);
2931 static void v9fs_mknod(void *opaque
)
2944 V9fsPDU
*pdu
= opaque
;
2945 V9fsState
*s
= pdu
->s
;
2947 pdu_unmarshal(pdu
, offset
, "dsdddd", &fid
, &name
, &mode
,
2948 &major
, &minor
, &gid
);
2949 trace_v9fs_mknod(pdu
->tag
, pdu
->id
, fid
, mode
, major
, minor
);
2951 fidp
= get_fid(pdu
, fid
);
2956 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, gid
,
2957 makedev(major
, minor
), mode
, &stbuf
);
2961 stat_to_qid(&stbuf
, &qid
);
2963 err
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
2964 trace_v9fs_mknod_return(pdu
->tag
, pdu
->id
,
2965 qid
.type
, qid
.version
, qid
.path
);
2969 complete_pdu(s
, pdu
, err
);
2970 v9fs_string_free(&name
);
2974 * Implement posix byte range locking code
2975 * Server side handling of locking code is very simple, because 9p server in
2976 * QEMU can handle only one client. And most of the lock handling
2977 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
2978 * do any thing in * qemu 9p server side lock code path.
2979 * So when a TLOCK request comes, always return success
2981 static void v9fs_lock(void *opaque
)
2988 int32_t fid
, err
= 0;
2989 V9fsPDU
*pdu
= opaque
;
2990 V9fsState
*s
= pdu
->s
;
2992 flock
= g_malloc(sizeof(*flock
));
2993 pdu_unmarshal(pdu
, offset
, "dbdqqds", &fid
, &flock
->type
,
2994 &flock
->flags
, &flock
->start
, &flock
->length
,
2995 &flock
->proc_id
, &flock
->client_id
);
2997 trace_v9fs_lock(pdu
->tag
, pdu
->id
, fid
,
2998 flock
->type
, flock
->start
, flock
->length
);
3000 status
= P9_LOCK_ERROR
;
3002 /* We support only block flag now (that too ignored currently) */
3003 if (flock
->flags
& ~P9_LOCK_FLAGS_BLOCK
) {
3007 fidp
= get_fid(pdu
, fid
);
3012 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3016 status
= P9_LOCK_SUCCESS
;
3021 err
+= pdu_marshal(pdu
, offset
, "b", status
);
3022 trace_v9fs_lock_return(pdu
->tag
, pdu
->id
, status
);
3023 complete_pdu(s
, pdu
, err
);
3024 v9fs_string_free(&flock
->client_id
);
3029 * When a TGETLOCK request comes, always return success because all lock
3030 * handling is done by client's VFS layer.
3032 static void v9fs_getlock(void *opaque
)
3038 int32_t fid
, err
= 0;
3039 V9fsPDU
*pdu
= opaque
;
3040 V9fsState
*s
= pdu
->s
;
3042 glock
= g_malloc(sizeof(*glock
));
3043 pdu_unmarshal(pdu
, offset
, "dbqqds", &fid
, &glock
->type
,
3044 &glock
->start
, &glock
->length
, &glock
->proc_id
,
3047 trace_v9fs_getlock(pdu
->tag
, pdu
->id
, fid
,
3048 glock
->type
, glock
->start
, glock
->length
);
3050 fidp
= get_fid(pdu
, fid
);
3055 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3059 glock
->type
= P9_LOCK_TYPE_UNLCK
;
3060 offset
+= pdu_marshal(pdu
, offset
, "bqqds", glock
->type
,
3061 glock
->start
, glock
->length
, glock
->proc_id
,
3064 trace_v9fs_getlock_return(pdu
->tag
, pdu
->id
, glock
->type
, glock
->start
,
3065 glock
->length
, glock
->proc_id
);
3069 complete_pdu(s
, pdu
, err
);
3070 v9fs_string_free(&glock
->client_id
);
3074 static void v9fs_mkdir(void *opaque
)
3076 V9fsPDU
*pdu
= opaque
;
3087 pdu_unmarshal(pdu
, offset
, "dsdd", &fid
, &name
, &mode
, &gid
);
3089 trace_v9fs_mkdir(pdu
->tag
, pdu
->id
, fid
, name
.data
, mode
, gid
);
3091 fidp
= get_fid(pdu
, fid
);
3096 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, mode
, fidp
->uid
, gid
, &stbuf
);
3100 stat_to_qid(&stbuf
, &qid
);
3101 offset
+= pdu_marshal(pdu
, offset
, "Q", &qid
);
3103 trace_v9fs_mkdir_return(pdu
->tag
, pdu
->id
,
3104 qid
.type
, qid
.version
, qid
.path
, err
);
3108 complete_pdu(pdu
->s
, pdu
, err
);
3109 v9fs_string_free(&name
);
3112 static void v9fs_xattrwalk(void *opaque
)
3118 int32_t fid
, newfid
;
3119 V9fsFidState
*file_fidp
;
3120 V9fsFidState
*xattr_fidp
= NULL
;
3121 V9fsPDU
*pdu
= opaque
;
3122 V9fsState
*s
= pdu
->s
;
3124 pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newfid
, &name
);
3125 trace_v9fs_xattrwalk(pdu
->tag
, pdu
->id
, fid
, newfid
, name
.data
);
3127 file_fidp
= get_fid(pdu
, fid
);
3128 if (file_fidp
== NULL
) {
3132 xattr_fidp
= alloc_fid(s
, newfid
);
3133 if (xattr_fidp
== NULL
) {
3137 v9fs_path_copy(&xattr_fidp
->path
, &file_fidp
->path
);
3138 if (name
.data
[0] == 0) {
3140 * listxattr request. Get the size first
3142 size
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
, NULL
, 0);
3145 clunk_fid(s
, xattr_fidp
->fid
);
3149 * Read the xattr value
3151 xattr_fidp
->fs
.xattr
.len
= size
;
3152 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3153 xattr_fidp
->fs
.xattr
.copied_len
= -1;
3155 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3156 err
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
,
3157 xattr_fidp
->fs
.xattr
.value
,
3158 xattr_fidp
->fs
.xattr
.len
);
3160 clunk_fid(s
, xattr_fidp
->fid
);
3164 offset
+= pdu_marshal(pdu
, offset
, "q", size
);
3168 * specific xattr fid. We check for xattr
3169 * presence also collect the xattr size
3171 size
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3175 clunk_fid(s
, xattr_fidp
->fid
);
3179 * Read the xattr value
3181 xattr_fidp
->fs
.xattr
.len
= size
;
3182 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3183 xattr_fidp
->fs
.xattr
.copied_len
= -1;
3185 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3186 err
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3187 &name
, xattr_fidp
->fs
.xattr
.value
,
3188 xattr_fidp
->fs
.xattr
.len
);
3190 clunk_fid(s
, xattr_fidp
->fid
);
3194 offset
+= pdu_marshal(pdu
, offset
, "q", size
);
3197 trace_v9fs_xattrwalk_return(pdu
->tag
, pdu
->id
, size
);
3199 put_fid(pdu
, file_fidp
);
3201 put_fid(pdu
, xattr_fidp
);
3204 complete_pdu(s
, pdu
, err
);
3205 v9fs_string_free(&name
);
3208 static void v9fs_xattrcreate(void *opaque
)
3216 V9fsFidState
*file_fidp
;
3217 V9fsFidState
*xattr_fidp
;
3218 V9fsPDU
*pdu
= opaque
;
3219 V9fsState
*s
= pdu
->s
;
3221 pdu_unmarshal(pdu
, offset
, "dsqd",
3222 &fid
, &name
, &size
, &flags
);
3223 trace_v9fs_xattrcreate(pdu
->tag
, pdu
->id
, fid
, name
.data
, size
, flags
);
3225 file_fidp
= get_fid(pdu
, fid
);
3226 if (file_fidp
== NULL
) {
3230 /* Make the file fid point to xattr */
3231 xattr_fidp
= file_fidp
;
3232 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3233 xattr_fidp
->fs
.xattr
.copied_len
= 0;
3234 xattr_fidp
->fs
.xattr
.len
= size
;
3235 xattr_fidp
->fs
.xattr
.flags
= flags
;
3236 v9fs_string_init(&xattr_fidp
->fs
.xattr
.name
);
3237 v9fs_string_copy(&xattr_fidp
->fs
.xattr
.name
, &name
);
3239 xattr_fidp
->fs
.xattr
.value
= g_malloc(size
);
3241 xattr_fidp
->fs
.xattr
.value
= NULL
;
3244 put_fid(pdu
, file_fidp
);
3246 complete_pdu(s
, pdu
, err
);
3247 v9fs_string_free(&name
);
3250 static void v9fs_readlink(void *opaque
)
3252 V9fsPDU
*pdu
= opaque
;
3259 pdu_unmarshal(pdu
, offset
, "d", &fid
);
3260 trace_v9fs_readlink(pdu
->tag
, pdu
->id
, fid
);
3261 fidp
= get_fid(pdu
, fid
);
3267 v9fs_string_init(&target
);
3268 err
= v9fs_co_readlink(pdu
, &fidp
->path
, &target
);
3272 offset
+= pdu_marshal(pdu
, offset
, "s", &target
);
3274 trace_v9fs_readlink_return(pdu
->tag
, pdu
->id
, target
.data
);
3275 v9fs_string_free(&target
);
3279 complete_pdu(pdu
->s
, pdu
, err
);
3282 static CoroutineEntry
*pdu_co_handlers
[] = {
3283 [P9_TREADDIR
] = v9fs_readdir
,
3284 [P9_TSTATFS
] = v9fs_statfs
,
3285 [P9_TGETATTR
] = v9fs_getattr
,
3286 [P9_TSETATTR
] = v9fs_setattr
,
3287 [P9_TXATTRWALK
] = v9fs_xattrwalk
,
3288 [P9_TXATTRCREATE
] = v9fs_xattrcreate
,
3289 [P9_TMKNOD
] = v9fs_mknod
,
3290 [P9_TRENAME
] = v9fs_rename
,
3291 [P9_TLOCK
] = v9fs_lock
,
3292 [P9_TGETLOCK
] = v9fs_getlock
,
3293 [P9_TRENAMEAT
] = v9fs_renameat
,
3294 [P9_TREADLINK
] = v9fs_readlink
,
3295 [P9_TUNLINKAT
] = v9fs_unlinkat
,
3296 [P9_TMKDIR
] = v9fs_mkdir
,
3297 [P9_TVERSION
] = v9fs_version
,
3298 [P9_TLOPEN
] = v9fs_open
,
3299 [P9_TATTACH
] = v9fs_attach
,
3300 [P9_TSTAT
] = v9fs_stat
,
3301 [P9_TWALK
] = v9fs_walk
,
3302 [P9_TCLUNK
] = v9fs_clunk
,
3303 [P9_TFSYNC
] = v9fs_fsync
,
3304 [P9_TOPEN
] = v9fs_open
,
3305 [P9_TREAD
] = v9fs_read
,
3307 [P9_TAUTH
] = v9fs_auth
,
3309 [P9_TFLUSH
] = v9fs_flush
,
3310 [P9_TLINK
] = v9fs_link
,
3311 [P9_TSYMLINK
] = v9fs_symlink
,
3312 [P9_TCREATE
] = v9fs_create
,
3313 [P9_TLCREATE
] = v9fs_lcreate
,
3314 [P9_TWRITE
] = v9fs_write
,
3315 [P9_TWSTAT
] = v9fs_wstat
,
3316 [P9_TREMOVE
] = v9fs_remove
,
3319 static void v9fs_op_not_supp(void *opaque
)
3321 V9fsPDU
*pdu
= opaque
;
3322 complete_pdu(pdu
->s
, pdu
, -EOPNOTSUPP
);
3325 static void v9fs_fs_ro(void *opaque
)
3327 V9fsPDU
*pdu
= opaque
;
3328 complete_pdu(pdu
->s
, pdu
, -EROFS
);
3331 static inline bool is_read_only_op(V9fsPDU
*pdu
)
3358 static void submit_pdu(V9fsState
*s
, V9fsPDU
*pdu
)
3361 CoroutineEntry
*handler
;
3363 if (pdu
->id
>= ARRAY_SIZE(pdu_co_handlers
) ||
3364 (pdu_co_handlers
[pdu
->id
] == NULL
)) {
3365 handler
= v9fs_op_not_supp
;
3367 handler
= pdu_co_handlers
[pdu
->id
];
3370 if (is_ro_export(&s
->ctx
) && !is_read_only_op(pdu
)) {
3371 handler
= v9fs_fs_ro
;
3373 co
= qemu_coroutine_create(handler
);
3374 qemu_coroutine_enter(co
, pdu
);
3377 void handle_9p_output(VirtIODevice
*vdev
, VirtQueue
*vq
)
3379 V9fsState
*s
= (V9fsState
*)vdev
;
3383 while ((pdu
= alloc_pdu(s
)) &&
3384 (len
= virtqueue_pop(vq
, &pdu
->elem
)) != 0) {
3387 BUG_ON(pdu
->elem
.out_num
== 0 || pdu
->elem
.in_num
== 0);
3388 BUG_ON(pdu
->elem
.out_sg
[0].iov_len
< 7);
3390 ptr
= pdu
->elem
.out_sg
[0].iov_base
;
3392 memcpy(&pdu
->size
, ptr
, 4);
3394 memcpy(&pdu
->tag
, ptr
+ 5, 2);
3395 qemu_co_queue_init(&pdu
->complete
);
3401 void virtio_9p_set_fd_limit(void)
3404 if (getrlimit(RLIMIT_NOFILE
, &rlim
) < 0) {
3405 fprintf(stderr
, "Failed to get the resource limit\n");
3408 open_fd_hw
= rlim
.rlim_cur
- MIN(400, rlim
.rlim_cur
/3);
3409 open_fd_rc
= rlim
.rlim_cur
/2;