4 * Copyright IBM, Corp. 2010
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #include "qemu/osdep.h"
15 #include <glib/gprintf.h>
16 #include "hw/virtio/virtio.h"
17 #include "qapi/error.h"
18 #include "qemu/error-report.h"
20 #include "qemu/main-loop.h"
21 #include "qemu/sockets.h"
22 #include "virtio-9p.h"
23 #include "fsdev/qemu-fsdev.h"
27 #include "migration/blocker.h"
28 #include "sysemu/qtest.h"
29 #include "qemu/xxhash.h"
31 #include <linux/limits.h>
35 static int open_fd_rc
;
49 static ssize_t
pdu_marshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
55 ret
= pdu
->s
->transport
->pdu_vmarshal(pdu
, offset
, fmt
, ap
);
61 static ssize_t
pdu_unmarshal(V9fsPDU
*pdu
, size_t offset
, const char *fmt
, ...)
67 ret
= pdu
->s
->transport
->pdu_vunmarshal(pdu
, offset
, fmt
, ap
);
73 static int omode_to_uflags(int8_t mode
)
107 typedef struct DotlOpenflagMap
{
112 static int dotl_to_open_flags(int flags
)
116 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
117 * and P9_DOTL_NOACCESS
119 int oflags
= flags
& O_ACCMODE
;
121 DotlOpenflagMap dotl_oflag_map
[] = {
122 { P9_DOTL_CREATE
, O_CREAT
},
123 { P9_DOTL_EXCL
, O_EXCL
},
124 { P9_DOTL_NOCTTY
, O_NOCTTY
},
125 { P9_DOTL_TRUNC
, O_TRUNC
},
126 { P9_DOTL_APPEND
, O_APPEND
},
127 { P9_DOTL_NONBLOCK
, O_NONBLOCK
} ,
128 { P9_DOTL_DSYNC
, O_DSYNC
},
129 { P9_DOTL_FASYNC
, FASYNC
},
130 { P9_DOTL_DIRECT
, O_DIRECT
},
131 { P9_DOTL_LARGEFILE
, O_LARGEFILE
},
132 { P9_DOTL_DIRECTORY
, O_DIRECTORY
},
133 { P9_DOTL_NOFOLLOW
, O_NOFOLLOW
},
134 { P9_DOTL_NOATIME
, O_NOATIME
},
135 { P9_DOTL_SYNC
, O_SYNC
},
138 for (i
= 0; i
< ARRAY_SIZE(dotl_oflag_map
); i
++) {
139 if (flags
& dotl_oflag_map
[i
].dotl_flag
) {
140 oflags
|= dotl_oflag_map
[i
].open_flag
;
147 void cred_init(FsCred
*credp
)
155 static int get_dotl_openflags(V9fsState
*s
, int oflags
)
159 * Filter the client open flags
161 flags
= dotl_to_open_flags(oflags
);
162 flags
&= ~(O_NOCTTY
| O_ASYNC
| O_CREAT
);
164 * Ignore direct disk access hint until the server supports it.
170 void v9fs_path_init(V9fsPath
*path
)
176 void v9fs_path_free(V9fsPath
*path
)
184 void GCC_FMT_ATTR(2, 3)
185 v9fs_path_sprintf(V9fsPath
*path
, const char *fmt
, ...)
189 v9fs_path_free(path
);
192 /* Bump the size for including terminating NULL */
193 path
->size
= g_vasprintf(&path
->data
, fmt
, ap
) + 1;
197 void v9fs_path_copy(V9fsPath
*dst
, const V9fsPath
*src
)
200 dst
->size
= src
->size
;
201 dst
->data
= g_memdup(src
->data
, src
->size
);
204 int v9fs_name_to_path(V9fsState
*s
, V9fsPath
*dirpath
,
205 const char *name
, V9fsPath
*path
)
208 err
= s
->ops
->name_to_path(&s
->ctx
, dirpath
, name
, path
);
216 * Return TRUE if s1 is an ancestor of s2.
218 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
219 * As a special case, We treat s1 as ancestor of s2 if they are same!
221 static int v9fs_path_is_ancestor(V9fsPath
*s1
, V9fsPath
*s2
)
223 if (!strncmp(s1
->data
, s2
->data
, s1
->size
- 1)) {
224 if (s2
->data
[s1
->size
- 1] == '\0' || s2
->data
[s1
->size
- 1] == '/') {
231 static size_t v9fs_string_size(V9fsString
*str
)
237 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
238 static int coroutine_fn
v9fs_reopen_fid(V9fsPDU
*pdu
, V9fsFidState
*f
)
241 if (f
->fid_type
== P9_FID_FILE
) {
242 if (f
->fs
.fd
== -1) {
244 err
= v9fs_co_open(pdu
, f
, f
->open_flags
);
245 } while (err
== -EINTR
&& !pdu
->cancelled
);
247 } else if (f
->fid_type
== P9_FID_DIR
) {
248 if (f
->fs
.dir
.stream
== NULL
) {
250 err
= v9fs_co_opendir(pdu
, f
);
251 } while (err
== -EINTR
&& !pdu
->cancelled
);
257 static V9fsFidState
*coroutine_fn
get_fid(V9fsPDU
*pdu
, int32_t fid
)
261 V9fsState
*s
= pdu
->s
;
263 for (f
= s
->fid_list
; f
; f
= f
->next
) {
267 * Update the fid ref upfront so that
268 * we don't get reclaimed when we yield
273 * check whether we need to reopen the
274 * file. We might have closed the fd
275 * while trying to free up some file
278 err
= v9fs_reopen_fid(pdu
, f
);
284 * Mark the fid as referenced so that the LRU
285 * reclaim won't close the file descriptor
287 f
->flags
|= FID_REFERENCED
;
294 static V9fsFidState
*alloc_fid(V9fsState
*s
, int32_t fid
)
298 for (f
= s
->fid_list
; f
; f
= f
->next
) {
299 /* If fid is already there return NULL */
305 f
= g_malloc0(sizeof(V9fsFidState
));
307 f
->fid_type
= P9_FID_NONE
;
310 * Mark the fid as referenced so that the LRU
311 * reclaim won't close the file descriptor
313 f
->flags
|= FID_REFERENCED
;
314 f
->next
= s
->fid_list
;
317 v9fs_readdir_init(s
->proto_version
, &f
->fs
.dir
);
318 v9fs_readdir_init(s
->proto_version
, &f
->fs_reclaim
.dir
);
323 static int coroutine_fn
v9fs_xattr_fid_clunk(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
327 if (fidp
->fs
.xattr
.xattrwalk_fid
) {
328 /* getxattr/listxattr fid */
332 * if this is fid for setxattr. clunk should
333 * result in setxattr localcall
335 if (fidp
->fs
.xattr
.len
!= fidp
->fs
.xattr
.copied_len
) {
336 /* clunk after partial write */
340 if (fidp
->fs
.xattr
.len
) {
341 retval
= v9fs_co_lsetxattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
,
342 fidp
->fs
.xattr
.value
,
344 fidp
->fs
.xattr
.flags
);
346 retval
= v9fs_co_lremovexattr(pdu
, &fidp
->path
, &fidp
->fs
.xattr
.name
);
349 v9fs_string_free(&fidp
->fs
.xattr
.name
);
351 g_free(fidp
->fs
.xattr
.value
);
355 static int coroutine_fn
free_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
359 if (fidp
->fid_type
== P9_FID_FILE
) {
360 /* If we reclaimed the fd no need to close */
361 if (fidp
->fs
.fd
!= -1) {
362 retval
= v9fs_co_close(pdu
, &fidp
->fs
);
364 } else if (fidp
->fid_type
== P9_FID_DIR
) {
365 if (fidp
->fs
.dir
.stream
!= NULL
) {
366 retval
= v9fs_co_closedir(pdu
, &fidp
->fs
);
368 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
369 retval
= v9fs_xattr_fid_clunk(pdu
, fidp
);
371 v9fs_path_free(&fidp
->path
);
376 static int coroutine_fn
put_fid(V9fsPDU
*pdu
, V9fsFidState
*fidp
)
381 * Don't free the fid if it is in reclaim list
383 if (!fidp
->ref
&& fidp
->clunked
) {
384 if (fidp
->fid
== pdu
->s
->root_fid
) {
386 * if the clunked fid is root fid then we
387 * have unmounted the fs on the client side.
388 * delete the migration blocker. Ideally, this
389 * should be hooked to transport close notification
391 if (pdu
->s
->migration_blocker
) {
392 migrate_del_blocker(pdu
->s
->migration_blocker
);
393 error_free(pdu
->s
->migration_blocker
);
394 pdu
->s
->migration_blocker
= NULL
;
397 return free_fid(pdu
, fidp
);
402 static V9fsFidState
*clunk_fid(V9fsState
*s
, int32_t fid
)
404 V9fsFidState
**fidpp
, *fidp
;
406 for (fidpp
= &s
->fid_list
; *fidpp
; fidpp
= &(*fidpp
)->next
) {
407 if ((*fidpp
)->fid
== fid
) {
411 if (*fidpp
== NULL
) {
420 void coroutine_fn
v9fs_reclaim_fd(V9fsPDU
*pdu
)
422 int reclaim_count
= 0;
423 V9fsState
*s
= pdu
->s
;
424 V9fsFidState
*f
, *reclaim_list
= NULL
;
426 for (f
= s
->fid_list
; f
; f
= f
->next
) {
428 * Unlink fids cannot be reclaimed. Check
429 * for them and skip them. Also skip fids
430 * currently being operated on.
432 if (f
->ref
|| f
->flags
& FID_NON_RECLAIMABLE
) {
436 * if it is a recently referenced fid
437 * we leave the fid untouched and clear the
438 * reference bit. We come back to it later
439 * in the next iteration. (a simple LRU without
440 * moving list elements around)
442 if (f
->flags
& FID_REFERENCED
) {
443 f
->flags
&= ~FID_REFERENCED
;
447 * Add fids to reclaim list.
449 if (f
->fid_type
== P9_FID_FILE
) {
450 if (f
->fs
.fd
!= -1) {
452 * Up the reference count so that
453 * a clunk request won't free this fid
456 f
->rclm_lst
= reclaim_list
;
458 f
->fs_reclaim
.fd
= f
->fs
.fd
;
462 } else if (f
->fid_type
== P9_FID_DIR
) {
463 if (f
->fs
.dir
.stream
!= NULL
) {
465 * Up the reference count so that
466 * a clunk request won't free this fid
469 f
->rclm_lst
= reclaim_list
;
471 f
->fs_reclaim
.dir
.stream
= f
->fs
.dir
.stream
;
472 f
->fs
.dir
.stream
= NULL
;
476 if (reclaim_count
>= open_fd_rc
) {
481 * Now close the fid in reclaim list. Free them if they
482 * are already clunked.
484 while (reclaim_list
) {
486 reclaim_list
= f
->rclm_lst
;
487 if (f
->fid_type
== P9_FID_FILE
) {
488 v9fs_co_close(pdu
, &f
->fs_reclaim
);
489 } else if (f
->fid_type
== P9_FID_DIR
) {
490 v9fs_co_closedir(pdu
, &f
->fs_reclaim
);
494 * Now drop the fid reference, free it
501 static int coroutine_fn
v9fs_mark_fids_unreclaim(V9fsPDU
*pdu
, V9fsPath
*path
)
504 V9fsState
*s
= pdu
->s
;
505 V9fsFidState
*fidp
, head_fid
;
507 head_fid
.next
= s
->fid_list
;
508 for (fidp
= s
->fid_list
; fidp
; fidp
= fidp
->next
) {
509 if (fidp
->path
.size
!= path
->size
) {
512 if (!memcmp(fidp
->path
.data
, path
->data
, path
->size
)) {
513 /* Mark the fid non reclaimable. */
514 fidp
->flags
|= FID_NON_RECLAIMABLE
;
516 /* reopen the file/dir if already closed */
517 err
= v9fs_reopen_fid(pdu
, fidp
);
522 * Go back to head of fid list because
523 * the list could have got updated when
524 * switched to the worker thread
534 static void coroutine_fn
virtfs_reset(V9fsPDU
*pdu
)
536 V9fsState
*s
= pdu
->s
;
540 while (s
->fid_list
) {
546 s
->fid_list
= fidp
->next
;
553 #define P9_QID_TYPE_DIR 0x80
554 #define P9_QID_TYPE_SYMLINK 0x02
556 #define P9_STAT_MODE_DIR 0x80000000
557 #define P9_STAT_MODE_APPEND 0x40000000
558 #define P9_STAT_MODE_EXCL 0x20000000
559 #define P9_STAT_MODE_MOUNT 0x10000000
560 #define P9_STAT_MODE_AUTH 0x08000000
561 #define P9_STAT_MODE_TMP 0x04000000
562 #define P9_STAT_MODE_SYMLINK 0x02000000
563 #define P9_STAT_MODE_LINK 0x01000000
564 #define P9_STAT_MODE_DEVICE 0x00800000
565 #define P9_STAT_MODE_NAMED_PIPE 0x00200000
566 #define P9_STAT_MODE_SOCKET 0x00100000
567 #define P9_STAT_MODE_SETUID 0x00080000
568 #define P9_STAT_MODE_SETGID 0x00040000
569 #define P9_STAT_MODE_SETVTX 0x00010000
571 #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
572 P9_STAT_MODE_SYMLINK | \
573 P9_STAT_MODE_LINK | \
574 P9_STAT_MODE_DEVICE | \
575 P9_STAT_MODE_NAMED_PIPE | \
578 /* Mirrors all bits of a byte. So e.g. binary 10100000 would become 00000101. */
579 static inline uint8_t mirror8bit(uint8_t byte
)
581 return (byte
* 0x0202020202ULL
& 0x010884422010ULL
) % 1023;
584 /* Same as mirror8bit() just for a 64 bit data type instead for a byte. */
585 static inline uint64_t mirror64bit(uint64_t value
)
587 return ((uint64_t)mirror8bit(value
& 0xff) << 56) |
588 ((uint64_t)mirror8bit((value
>> 8) & 0xff) << 48) |
589 ((uint64_t)mirror8bit((value
>> 16) & 0xff) << 40) |
590 ((uint64_t)mirror8bit((value
>> 24) & 0xff) << 32) |
591 ((uint64_t)mirror8bit((value
>> 32) & 0xff) << 24) |
592 ((uint64_t)mirror8bit((value
>> 40) & 0xff) << 16) |
593 ((uint64_t)mirror8bit((value
>> 48) & 0xff) << 8) |
594 ((uint64_t)mirror8bit((value
>> 56) & 0xff));
598 * @brief Parameter k for the Exponential Golomb algorihm to be used.
600 * The smaller this value, the smaller the minimum bit count for the Exp.
601 * Golomb generated affixes will be (at lowest index) however for the
602 * price of having higher maximum bit count of generated affixes (at highest
603 * index). Likewise increasing this parameter yields in smaller maximum bit
604 * count for the price of having higher minimum bit count.
606 * In practice that means: a good value for k depends on the expected amount
607 * of devices to be exposed by one export. For a small amount of devices k
608 * should be small, for a large amount of devices k might be increased
609 * instead. The default of k=0 should be fine for most users though.
611 * @b IMPORTANT: In case this ever becomes a runtime parameter; the value of
612 * k should not change as long as guest is still running! Because that would
613 * cause completely different inode numbers to be generated on guest.
615 #define EXP_GOLOMB_K 0
618 * @brief Exponential Golomb algorithm for arbitrary k (including k=0).
620 * The Exponential Golomb algorithm generates @b prefixes (@b not suffixes!)
621 * with growing length and with the mathematical property of being
622 * "prefix-free". The latter means the generated prefixes can be prepended
623 * in front of arbitrary numbers and the resulting concatenated numbers are
624 * guaranteed to be always unique.
626 * This is a minor adjustment to the original Exp. Golomb algorithm in the
627 * sense that lowest allowed index (@param n) starts with 1, not with zero.
629 * @param n - natural number (or index) of the prefix to be generated
631 * @param k - parameter k of Exp. Golomb algorithm to be used
632 * (see comment on EXP_GOLOMB_K macro for details about k)
634 static VariLenAffix
expGolombEncode(uint64_t n
, int k
)
636 const uint64_t value
= n
+ (1 << k
) - 1;
637 const int bits
= (int) log2(value
) + 1;
638 return (VariLenAffix
) {
639 .type
= AffixType_Prefix
,
641 .bits
= bits
+ MAX((bits
- 1 - k
), 0)
646 * @brief Converts a suffix into a prefix, or a prefix into a suffix.
648 * Simply mirror all bits of the affix value, for the purpose to preserve
649 * respectively the mathematical "prefix-free" or "suffix-free" property
650 * after the conversion.
652 * If a passed prefix is suitable to create unique numbers, then the
653 * returned suffix is suitable to create unique numbers as well (and vice
656 static VariLenAffix
invertAffix(const VariLenAffix
*affix
)
658 return (VariLenAffix
) {
660 (affix
->type
== AffixType_Suffix
) ?
661 AffixType_Prefix
: AffixType_Suffix
,
663 mirror64bit(affix
->value
) >>
664 ((sizeof(affix
->value
) * 8) - affix
->bits
),
670 * @brief Generates suffix numbers with "suffix-free" property.
672 * This is just a wrapper function on top of the Exp. Golomb algorithm.
674 * Since the Exp. Golomb algorithm generates prefixes, but we need suffixes,
675 * this function converts the Exp. Golomb prefixes into appropriate suffixes
676 * which are still suitable for generating unique numbers.
678 * @param n - natural number (or index) of the suffix to be generated
681 static VariLenAffix
affixForIndex(uint64_t index
)
684 prefix
= expGolombEncode(index
, EXP_GOLOMB_K
);
685 return invertAffix(&prefix
); /* convert prefix to suffix */
688 /* creative abuse of tb_hash_func7, which is based on xxhash */
689 static uint32_t qpp_hash(QppEntry e
)
691 return qemu_xxhash7(e
.ino_prefix
, e
.dev
, 0, 0, 0);
694 static uint32_t qpf_hash(QpfEntry e
)
696 return qemu_xxhash7(e
.ino
, e
.dev
, 0, 0, 0);
699 static bool qpd_cmp_func(const void *obj
, const void *userp
)
701 const QpdEntry
*e1
= obj
, *e2
= userp
;
702 return e1
->dev
== e2
->dev
;
705 static bool qpp_cmp_func(const void *obj
, const void *userp
)
707 const QppEntry
*e1
= obj
, *e2
= userp
;
708 return e1
->dev
== e2
->dev
&& e1
->ino_prefix
== e2
->ino_prefix
;
711 static bool qpf_cmp_func(const void *obj
, const void *userp
)
713 const QpfEntry
*e1
= obj
, *e2
= userp
;
714 return e1
->dev
== e2
->dev
&& e1
->ino
== e2
->ino
;
717 static void qp_table_remove(void *p
, uint32_t h
, void *up
)
722 static void qp_table_destroy(struct qht
*ht
)
724 if (!ht
|| !ht
->map
) {
727 qht_iter(ht
, qp_table_remove
, NULL
);
731 static void qpd_table_init(struct qht
*ht
)
733 qht_init(ht
, qpd_cmp_func
, 1, QHT_MODE_AUTO_RESIZE
);
736 static void qpp_table_init(struct qht
*ht
)
738 qht_init(ht
, qpp_cmp_func
, 1, QHT_MODE_AUTO_RESIZE
);
741 static void qpf_table_init(struct qht
*ht
)
743 qht_init(ht
, qpf_cmp_func
, 1 << 16, QHT_MODE_AUTO_RESIZE
);
747 * Returns how many (high end) bits of inode numbers of the passed fs
748 * device shall be used (in combination with the device number) to
749 * generate hash values for qpp_table entries.
751 * This function is required if variable length suffixes are used for inode
752 * number mapping on guest level. Since a device may end up having multiple
753 * entries in qpp_table, each entry most probably with a different suffix
754 * length, we thus need this function in conjunction with qpd_table to
755 * "agree" about a fix amount of bits (per device) to be always used for
756 * generating hash values for the purpose of accessing qpp_table in order
757 * get consistent behaviour when accessing qpp_table.
759 static int qid_inode_prefix_hash_bits(V9fsPDU
*pdu
, dev_t dev
)
767 val
= qht_lookup(&pdu
->s
->qpd_table
, &lookup
, hash
);
769 val
= g_malloc0(sizeof(QpdEntry
));
771 affix
= affixForIndex(pdu
->s
->qp_affix_next
);
772 val
->prefix_bits
= affix
.bits
;
773 qht_insert(&pdu
->s
->qpd_table
, val
, hash
, NULL
);
774 pdu
->s
->qp_ndevices
++;
776 return val
->prefix_bits
;
780 * @brief Slow / full mapping host inode nr -> guest inode nr.
782 * This function performs a slower and much more costly remapping of an
783 * original file inode number on host to an appropriate different inode
784 * number on guest. For every (dev, inode) combination on host a new
785 * sequential number is generated, cached and exposed as inode number on
788 * This is just a "last resort" fallback solution if the much faster/cheaper
789 * qid_path_suffixmap() failed. In practice this slow / full mapping is not
790 * expected ever to be used at all though.
792 * @see qid_path_suffixmap() for details
795 static int qid_path_fullmap(V9fsPDU
*pdu
, const struct stat
*stbuf
,
799 .dev
= stbuf
->st_dev
,
802 uint32_t hash
= qpf_hash(lookup
);
805 val
= qht_lookup(&pdu
->s
->qpf_table
, &lookup
, hash
);
808 if (pdu
->s
->qp_fullpath_next
== 0) {
809 /* no more files can be mapped :'( */
811 "9p: No more prefixes available for remapping inodes from "
817 val
= g_malloc0(sizeof(QppEntry
));
820 /* new unique inode and device combo */
821 affix
= affixForIndex(
822 1ULL << (sizeof(pdu
->s
->qp_affix_next
) * 8)
824 val
->path
= (pdu
->s
->qp_fullpath_next
++ << affix
.bits
) | affix
.value
;
825 pdu
->s
->qp_fullpath_next
&= ((1ULL << (64 - affix
.bits
)) - 1);
826 qht_insert(&pdu
->s
->qpf_table
, val
, hash
, NULL
);
834 * @brief Quick mapping host inode nr -> guest inode nr.
836 * This function performs quick remapping of an original file inode number
837 * on host to an appropriate different inode number on guest. This remapping
838 * of inodes is required to avoid inode nr collisions on guest which would
839 * happen if the 9p export contains more than 1 exported file system (or
840 * more than 1 file system data set), because unlike on host level where the
841 * files would have different device nrs, all files exported by 9p would
842 * share the same device nr on guest (the device nr of the virtual 9p device
845 * Inode remapping is performed by chopping off high end bits of the original
846 * inode number from host, shifting the result upwards and then assigning a
847 * generated suffix number for the low end bits, where the same suffix number
848 * will be shared by all inodes with the same device id AND the same high end
849 * bits that have been chopped off. That approach utilizes the fact that inode
850 * numbers very likely share the same high end bits (i.e. due to their common
851 * sequential generation by file systems) and hence we only have to generate
852 * and track a very limited amount of suffixes in practice due to that.
854 * We generate variable size suffixes for that purpose. The 1st generated
855 * suffix will only have 1 bit and hence we only need to chop off 1 bit from
856 * the original inode number. The subsequent suffixes being generated will
857 * grow in (bit) size subsequently, i.e. the 2nd and 3rd suffix being
858 * generated will have 3 bits and hence we have to chop off 3 bits from their
859 * original inodes, and so on. That approach of using variable length suffixes
860 * (i.e. over fixed size ones) utilizes the fact that in practice only a very
861 * limited amount of devices are shared by the same export (e.g. typically
862 * less than 2 dozen devices per 9p export), so in practice we need to chop
863 * off less bits than with fixed size prefixes and yet are flexible to add
864 * new devices at runtime below host's export directory at any time without
865 * having to reboot guest nor requiring to reconfigure guest for that. And due
866 * to the very limited amount of original high end bits that we chop off that
867 * way, the total amount of suffixes we need to generate is less than by using
868 * fixed size prefixes and hence it also improves performance of the inode
869 * remapping algorithm, and finally has the nice side effect that the inode
870 * numbers on guest will be much smaller & human friendly. ;-)
872 static int qid_path_suffixmap(V9fsPDU
*pdu
, const struct stat
*stbuf
,
875 const int ino_hash_bits
= qid_inode_prefix_hash_bits(pdu
, stbuf
->st_dev
);
877 .dev
= stbuf
->st_dev
,
878 .ino_prefix
= (uint16_t) (stbuf
->st_ino
>> (64 - ino_hash_bits
))
880 uint32_t hash
= qpp_hash(lookup
);
882 val
= qht_lookup(&pdu
->s
->qpp_table
, &lookup
, hash
);
885 if (pdu
->s
->qp_affix_next
== 0) {
886 /* we ran out of affixes */
888 "9p: Potential degraded performance of inode remapping"
893 val
= g_malloc0(sizeof(QppEntry
));
896 /* new unique inode affix and device combo */
897 val
->qp_affix_index
= pdu
->s
->qp_affix_next
++;
898 val
->qp_affix
= affixForIndex(val
->qp_affix_index
);
899 qht_insert(&pdu
->s
->qpp_table
, val
, hash
, NULL
);
901 /* assuming generated affix to be suffix type, not prefix */
902 *path
= (stbuf
->st_ino
<< val
->qp_affix
.bits
) | val
->qp_affix
.value
;
906 static int stat_to_qid(V9fsPDU
*pdu
, const struct stat
*stbuf
, V9fsQID
*qidp
)
911 if (pdu
->s
->ctx
.export_flags
& V9FS_REMAP_INODES
) {
912 /* map inode+device to qid path (fast path) */
913 err
= qid_path_suffixmap(pdu
, stbuf
, &qidp
->path
);
914 if (err
== -ENFILE
) {
915 /* fast path didn't work, fall back to full map */
916 err
= qid_path_fullmap(pdu
, stbuf
, &qidp
->path
);
922 if (pdu
->s
->dev_id
!= stbuf
->st_dev
) {
923 if (pdu
->s
->ctx
.export_flags
& V9FS_FORBID_MULTIDEVS
) {
925 "9p: Multiple devices detected in same VirtFS export. "
926 "Access of guest to additional devices is (partly) "
927 "denied due to virtfs option 'multidevs=forbid' being "
933 "9p: Multiple devices detected in same VirtFS export, "
934 "which might lead to file ID collisions and severe "
935 "misbehaviours on guest! You should either use a "
936 "separate export for each device shared from host or "
937 "use virtfs option 'multidevs=remap'!"
941 memset(&qidp
->path
, 0, sizeof(qidp
->path
));
942 size
= MIN(sizeof(stbuf
->st_ino
), sizeof(qidp
->path
));
943 memcpy(&qidp
->path
, &stbuf
->st_ino
, size
);
946 qidp
->version
= stbuf
->st_mtime
^ (stbuf
->st_size
<< 8);
948 if (S_ISDIR(stbuf
->st_mode
)) {
949 qidp
->type
|= P9_QID_TYPE_DIR
;
951 if (S_ISLNK(stbuf
->st_mode
)) {
952 qidp
->type
|= P9_QID_TYPE_SYMLINK
;
958 static int coroutine_fn
fid_to_qid(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
964 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
968 err
= stat_to_qid(pdu
, &stbuf
, qidp
);
975 V9fsPDU
*pdu_alloc(V9fsState
*s
)
979 if (!QLIST_EMPTY(&s
->free_list
)) {
980 pdu
= QLIST_FIRST(&s
->free_list
);
981 QLIST_REMOVE(pdu
, next
);
982 QLIST_INSERT_HEAD(&s
->active_list
, pdu
, next
);
987 void pdu_free(V9fsPDU
*pdu
)
989 V9fsState
*s
= pdu
->s
;
991 g_assert(!pdu
->cancelled
);
992 QLIST_REMOVE(pdu
, next
);
993 QLIST_INSERT_HEAD(&s
->free_list
, pdu
, next
);
996 static void coroutine_fn
pdu_complete(V9fsPDU
*pdu
, ssize_t len
)
998 int8_t id
= pdu
->id
+ 1; /* Response */
999 V9fsState
*s
= pdu
->s
;
1003 * The 9p spec requires that successfully cancelled pdus receive no reply.
1004 * Sending a reply would confuse clients because they would
1005 * assume that any EINTR is the actual result of the operation,
1006 * rather than a consequence of the cancellation. However, if
1007 * the operation completed (succesfully or with an error other
1008 * than caused be cancellation), we do send out that reply, both
1009 * for efficiency and to avoid confusing the rest of the state machine
1010 * that assumes passing a non-error here will mean a successful
1011 * transmission of the reply.
1013 bool discard
= pdu
->cancelled
&& len
== -EINTR
;
1015 trace_v9fs_rcancel(pdu
->tag
, pdu
->id
);
1024 if (s
->proto_version
!= V9FS_PROTO_2000L
) {
1027 str
.data
= strerror(err
);
1028 str
.size
= strlen(str
.data
);
1030 ret
= pdu_marshal(pdu
, len
, "s", &str
);
1038 ret
= pdu_marshal(pdu
, len
, "d", err
);
1044 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1047 trace_v9fs_rerror(pdu
->tag
, pdu
->id
, err
); /* Trace ERROR */
1050 /* fill out the header */
1051 if (pdu_marshal(pdu
, 0, "dbw", (int32_t)len
, id
, pdu
->tag
) < 0) {
1055 /* keep these in sync */
1060 pdu
->s
->transport
->push_and_notify(pdu
);
1062 /* Now wakeup anybody waiting in flush for this request */
1063 if (!qemu_co_queue_next(&pdu
->complete
)) {
1068 static mode_t
v9mode_to_mode(uint32_t mode
, V9fsString
*extension
)
1073 if (mode
& P9_STAT_MODE_DIR
) {
1077 if (mode
& P9_STAT_MODE_SYMLINK
) {
1080 if (mode
& P9_STAT_MODE_SOCKET
) {
1083 if (mode
& P9_STAT_MODE_NAMED_PIPE
) {
1086 if (mode
& P9_STAT_MODE_DEVICE
) {
1087 if (extension
->size
&& extension
->data
[0] == 'c') {
1098 if (mode
& P9_STAT_MODE_SETUID
) {
1101 if (mode
& P9_STAT_MODE_SETGID
) {
1104 if (mode
& P9_STAT_MODE_SETVTX
) {
1111 static int donttouch_stat(V9fsStat
*stat
)
1113 if (stat
->type
== -1 &&
1115 stat
->qid
.type
== 0xff &&
1116 stat
->qid
.version
== (uint32_t) -1 &&
1117 stat
->qid
.path
== (uint64_t) -1 &&
1119 stat
->atime
== -1 &&
1120 stat
->mtime
== -1 &&
1121 stat
->length
== -1 &&
1126 stat
->n_uid
== -1 &&
1127 stat
->n_gid
== -1 &&
1128 stat
->n_muid
== -1) {
1135 static void v9fs_stat_init(V9fsStat
*stat
)
1137 v9fs_string_init(&stat
->name
);
1138 v9fs_string_init(&stat
->uid
);
1139 v9fs_string_init(&stat
->gid
);
1140 v9fs_string_init(&stat
->muid
);
1141 v9fs_string_init(&stat
->extension
);
1144 static void v9fs_stat_free(V9fsStat
*stat
)
1146 v9fs_string_free(&stat
->name
);
1147 v9fs_string_free(&stat
->uid
);
1148 v9fs_string_free(&stat
->gid
);
1149 v9fs_string_free(&stat
->muid
);
1150 v9fs_string_free(&stat
->extension
);
1153 static uint32_t stat_to_v9mode(const struct stat
*stbuf
)
1157 mode
= stbuf
->st_mode
& 0777;
1158 if (S_ISDIR(stbuf
->st_mode
)) {
1159 mode
|= P9_STAT_MODE_DIR
;
1162 if (S_ISLNK(stbuf
->st_mode
)) {
1163 mode
|= P9_STAT_MODE_SYMLINK
;
1166 if (S_ISSOCK(stbuf
->st_mode
)) {
1167 mode
|= P9_STAT_MODE_SOCKET
;
1170 if (S_ISFIFO(stbuf
->st_mode
)) {
1171 mode
|= P9_STAT_MODE_NAMED_PIPE
;
1174 if (S_ISBLK(stbuf
->st_mode
) || S_ISCHR(stbuf
->st_mode
)) {
1175 mode
|= P9_STAT_MODE_DEVICE
;
1178 if (stbuf
->st_mode
& S_ISUID
) {
1179 mode
|= P9_STAT_MODE_SETUID
;
1182 if (stbuf
->st_mode
& S_ISGID
) {
1183 mode
|= P9_STAT_MODE_SETGID
;
1186 if (stbuf
->st_mode
& S_ISVTX
) {
1187 mode
|= P9_STAT_MODE_SETVTX
;
1193 static int coroutine_fn
stat_to_v9stat(V9fsPDU
*pdu
, V9fsPath
*path
,
1194 const char *basename
,
1195 const struct stat
*stbuf
,
1200 memset(v9stat
, 0, sizeof(*v9stat
));
1202 err
= stat_to_qid(pdu
, stbuf
, &v9stat
->qid
);
1206 v9stat
->mode
= stat_to_v9mode(stbuf
);
1207 v9stat
->atime
= stbuf
->st_atime
;
1208 v9stat
->mtime
= stbuf
->st_mtime
;
1209 v9stat
->length
= stbuf
->st_size
;
1211 v9fs_string_free(&v9stat
->uid
);
1212 v9fs_string_free(&v9stat
->gid
);
1213 v9fs_string_free(&v9stat
->muid
);
1215 v9stat
->n_uid
= stbuf
->st_uid
;
1216 v9stat
->n_gid
= stbuf
->st_gid
;
1219 v9fs_string_free(&v9stat
->extension
);
1221 if (v9stat
->mode
& P9_STAT_MODE_SYMLINK
) {
1222 err
= v9fs_co_readlink(pdu
, path
, &v9stat
->extension
);
1226 } else if (v9stat
->mode
& P9_STAT_MODE_DEVICE
) {
1227 v9fs_string_sprintf(&v9stat
->extension
, "%c %u %u",
1228 S_ISCHR(stbuf
->st_mode
) ? 'c' : 'b',
1229 major(stbuf
->st_rdev
), minor(stbuf
->st_rdev
));
1230 } else if (S_ISDIR(stbuf
->st_mode
) || S_ISREG(stbuf
->st_mode
)) {
1231 v9fs_string_sprintf(&v9stat
->extension
, "%s %lu",
1232 "HARDLINKCOUNT", (unsigned long)stbuf
->st_nlink
);
1235 v9fs_string_sprintf(&v9stat
->name
, "%s", basename
);
1238 v9fs_string_size(&v9stat
->name
) +
1239 v9fs_string_size(&v9stat
->uid
) +
1240 v9fs_string_size(&v9stat
->gid
) +
1241 v9fs_string_size(&v9stat
->muid
) +
1242 v9fs_string_size(&v9stat
->extension
);
1246 #define P9_STATS_MODE 0x00000001ULL
1247 #define P9_STATS_NLINK 0x00000002ULL
1248 #define P9_STATS_UID 0x00000004ULL
1249 #define P9_STATS_GID 0x00000008ULL
1250 #define P9_STATS_RDEV 0x00000010ULL
1251 #define P9_STATS_ATIME 0x00000020ULL
1252 #define P9_STATS_MTIME 0x00000040ULL
1253 #define P9_STATS_CTIME 0x00000080ULL
1254 #define P9_STATS_INO 0x00000100ULL
1255 #define P9_STATS_SIZE 0x00000200ULL
1256 #define P9_STATS_BLOCKS 0x00000400ULL
1258 #define P9_STATS_BTIME 0x00000800ULL
1259 #define P9_STATS_GEN 0x00001000ULL
1260 #define P9_STATS_DATA_VERSION 0x00002000ULL
1262 #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
1263 #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
1266 static int stat_to_v9stat_dotl(V9fsPDU
*pdu
, const struct stat
*stbuf
,
1267 V9fsStatDotl
*v9lstat
)
1269 memset(v9lstat
, 0, sizeof(*v9lstat
));
1271 v9lstat
->st_mode
= stbuf
->st_mode
;
1272 v9lstat
->st_nlink
= stbuf
->st_nlink
;
1273 v9lstat
->st_uid
= stbuf
->st_uid
;
1274 v9lstat
->st_gid
= stbuf
->st_gid
;
1275 v9lstat
->st_rdev
= stbuf
->st_rdev
;
1276 v9lstat
->st_size
= stbuf
->st_size
;
1277 v9lstat
->st_blksize
= stbuf
->st_blksize
;
1278 v9lstat
->st_blocks
= stbuf
->st_blocks
;
1279 v9lstat
->st_atime_sec
= stbuf
->st_atime
;
1280 v9lstat
->st_atime_nsec
= stbuf
->st_atim
.tv_nsec
;
1281 v9lstat
->st_mtime_sec
= stbuf
->st_mtime
;
1282 v9lstat
->st_mtime_nsec
= stbuf
->st_mtim
.tv_nsec
;
1283 v9lstat
->st_ctime_sec
= stbuf
->st_ctime
;
1284 v9lstat
->st_ctime_nsec
= stbuf
->st_ctim
.tv_nsec
;
1285 /* Currently we only support BASIC fields in stat */
1286 v9lstat
->st_result_mask
= P9_STATS_BASIC
;
1288 return stat_to_qid(pdu
, stbuf
, &v9lstat
->qid
);
1291 static void print_sg(struct iovec
*sg
, int cnt
)
1295 printf("sg[%d]: {", cnt
);
1296 for (i
= 0; i
< cnt
; i
++) {
1300 printf("(%p, %zd)", sg
[i
].iov_base
, sg
[i
].iov_len
);
1305 /* Will call this only for path name based fid */
1306 static void v9fs_fix_path(V9fsPath
*dst
, V9fsPath
*src
, int len
)
1309 v9fs_path_init(&str
);
1310 v9fs_path_copy(&str
, dst
);
1311 v9fs_path_sprintf(dst
, "%s%s", src
->data
, str
.data
+ len
);
1312 v9fs_path_free(&str
);
1315 static inline bool is_ro_export(FsContext
*ctx
)
1317 return ctx
->export_flags
& V9FS_RDONLY
;
1320 static void coroutine_fn
v9fs_version(void *opaque
)
1323 V9fsPDU
*pdu
= opaque
;
1324 V9fsState
*s
= pdu
->s
;
1328 v9fs_string_init(&version
);
1329 err
= pdu_unmarshal(pdu
, offset
, "ds", &s
->msize
, &version
);
1333 trace_v9fs_version(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
1337 if (!strcmp(version
.data
, "9P2000.u")) {
1338 s
->proto_version
= V9FS_PROTO_2000U
;
1339 } else if (!strcmp(version
.data
, "9P2000.L")) {
1340 s
->proto_version
= V9FS_PROTO_2000L
;
1342 v9fs_string_sprintf(&version
, "unknown");
1343 /* skip min. msize check, reporting invalid version has priority */
1347 if (s
->msize
< P9_MIN_MSIZE
) {
1350 "9pfs: Client requested msize < minimum msize ("
1351 stringify(P9_MIN_MSIZE
) ") supported by this server."
1357 err
= pdu_marshal(pdu
, offset
, "ds", s
->msize
, &version
);
1362 trace_v9fs_version_return(pdu
->tag
, pdu
->id
, s
->msize
, version
.data
);
1364 pdu_complete(pdu
, err
);
1365 v9fs_string_free(&version
);
1368 static void coroutine_fn
v9fs_attach(void *opaque
)
1370 V9fsPDU
*pdu
= opaque
;
1371 V9fsState
*s
= pdu
->s
;
1372 int32_t fid
, afid
, n_uname
;
1373 V9fsString uname
, aname
;
1379 v9fs_string_init(&uname
);
1380 v9fs_string_init(&aname
);
1381 err
= pdu_unmarshal(pdu
, offset
, "ddssd", &fid
,
1382 &afid
, &uname
, &aname
, &n_uname
);
1386 trace_v9fs_attach(pdu
->tag
, pdu
->id
, fid
, afid
, uname
.data
, aname
.data
);
1388 fidp
= alloc_fid(s
, fid
);
1393 fidp
->uid
= n_uname
;
1394 err
= v9fs_co_name_to_path(pdu
, NULL
, "/", &fidp
->path
);
1400 err
= fid_to_qid(pdu
, fidp
, &qid
);
1408 * disable migration if we haven't done already.
1409 * attach could get called multiple times for the same export.
1411 if (!s
->migration_blocker
) {
1412 error_setg(&s
->migration_blocker
,
1413 "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
1414 s
->ctx
.fs_root
? s
->ctx
.fs_root
: "NULL", s
->tag
);
1415 err
= migrate_add_blocker(s
->migration_blocker
, NULL
);
1417 error_free(s
->migration_blocker
);
1418 s
->migration_blocker
= NULL
;
1425 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
1432 memcpy(&s
->root_qid
, &qid
, sizeof(qid
));
1433 trace_v9fs_attach_return(pdu
->tag
, pdu
->id
,
1434 qid
.type
, qid
.version
, qid
.path
);
1438 pdu_complete(pdu
, err
);
1439 v9fs_string_free(&uname
);
1440 v9fs_string_free(&aname
);
1443 static void coroutine_fn
v9fs_stat(void *opaque
)
1451 V9fsPDU
*pdu
= opaque
;
1454 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
1458 trace_v9fs_stat(pdu
->tag
, pdu
->id
, fid
);
1460 fidp
= get_fid(pdu
, fid
);
1465 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1469 basename
= g_path_get_basename(fidp
->path
.data
);
1470 err
= stat_to_v9stat(pdu
, &fidp
->path
, basename
, &stbuf
, &v9stat
);
1475 err
= pdu_marshal(pdu
, offset
, "wS", 0, &v9stat
);
1477 v9fs_stat_free(&v9stat
);
1480 trace_v9fs_stat_return(pdu
->tag
, pdu
->id
, v9stat
.mode
,
1481 v9stat
.atime
, v9stat
.mtime
, v9stat
.length
);
1483 v9fs_stat_free(&v9stat
);
1487 pdu_complete(pdu
, err
);
1490 static void coroutine_fn
v9fs_getattr(void *opaque
)
1497 uint64_t request_mask
;
1498 V9fsStatDotl v9stat_dotl
;
1499 V9fsPDU
*pdu
= opaque
;
1501 retval
= pdu_unmarshal(pdu
, offset
, "dq", &fid
, &request_mask
);
1505 trace_v9fs_getattr(pdu
->tag
, pdu
->id
, fid
, request_mask
);
1507 fidp
= get_fid(pdu
, fid
);
1513 * Currently we only support BASIC fields in stat, so there is no
1514 * need to look at request_mask.
1516 retval
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1520 retval
= stat_to_v9stat_dotl(pdu
, &stbuf
, &v9stat_dotl
);
1525 /* fill st_gen if requested and supported by underlying fs */
1526 if (request_mask
& P9_STATS_GEN
) {
1527 retval
= v9fs_co_st_gen(pdu
, &fidp
->path
, stbuf
.st_mode
, &v9stat_dotl
);
1530 /* we have valid st_gen: update result mask */
1531 v9stat_dotl
.st_result_mask
|= P9_STATS_GEN
;
1534 /* request cancelled, e.g. by Tflush */
1537 /* failed to get st_gen: not fatal, ignore */
1541 retval
= pdu_marshal(pdu
, offset
, "A", &v9stat_dotl
);
1546 trace_v9fs_getattr_return(pdu
->tag
, pdu
->id
, v9stat_dotl
.st_result_mask
,
1547 v9stat_dotl
.st_mode
, v9stat_dotl
.st_uid
,
1548 v9stat_dotl
.st_gid
);
1552 pdu_complete(pdu
, retval
);
1555 /* Attribute flags */
1556 #define P9_ATTR_MODE (1 << 0)
1557 #define P9_ATTR_UID (1 << 1)
1558 #define P9_ATTR_GID (1 << 2)
1559 #define P9_ATTR_SIZE (1 << 3)
1560 #define P9_ATTR_ATIME (1 << 4)
1561 #define P9_ATTR_MTIME (1 << 5)
1562 #define P9_ATTR_CTIME (1 << 6)
1563 #define P9_ATTR_ATIME_SET (1 << 7)
1564 #define P9_ATTR_MTIME_SET (1 << 8)
1566 #define P9_ATTR_MASK 127
1568 static void coroutine_fn
v9fs_setattr(void *opaque
)
1575 V9fsPDU
*pdu
= opaque
;
1577 err
= pdu_unmarshal(pdu
, offset
, "dI", &fid
, &v9iattr
);
1582 trace_v9fs_setattr(pdu
->tag
, pdu
->id
, fid
,
1583 v9iattr
.valid
, v9iattr
.mode
, v9iattr
.uid
, v9iattr
.gid
,
1584 v9iattr
.size
, v9iattr
.atime_sec
, v9iattr
.mtime_sec
);
1586 fidp
= get_fid(pdu
, fid
);
1591 if (v9iattr
.valid
& P9_ATTR_MODE
) {
1592 err
= v9fs_co_chmod(pdu
, &fidp
->path
, v9iattr
.mode
);
1597 if (v9iattr
.valid
& (P9_ATTR_ATIME
| P9_ATTR_MTIME
)) {
1598 struct timespec times
[2];
1599 if (v9iattr
.valid
& P9_ATTR_ATIME
) {
1600 if (v9iattr
.valid
& P9_ATTR_ATIME_SET
) {
1601 times
[0].tv_sec
= v9iattr
.atime_sec
;
1602 times
[0].tv_nsec
= v9iattr
.atime_nsec
;
1604 times
[0].tv_nsec
= UTIME_NOW
;
1607 times
[0].tv_nsec
= UTIME_OMIT
;
1609 if (v9iattr
.valid
& P9_ATTR_MTIME
) {
1610 if (v9iattr
.valid
& P9_ATTR_MTIME_SET
) {
1611 times
[1].tv_sec
= v9iattr
.mtime_sec
;
1612 times
[1].tv_nsec
= v9iattr
.mtime_nsec
;
1614 times
[1].tv_nsec
= UTIME_NOW
;
1617 times
[1].tv_nsec
= UTIME_OMIT
;
1619 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
1625 * If the only valid entry in iattr is ctime we can call
1626 * chown(-1,-1) to update the ctime of the file
1628 if ((v9iattr
.valid
& (P9_ATTR_UID
| P9_ATTR_GID
)) ||
1629 ((v9iattr
.valid
& P9_ATTR_CTIME
)
1630 && !((v9iattr
.valid
& P9_ATTR_MASK
) & ~P9_ATTR_CTIME
))) {
1631 if (!(v9iattr
.valid
& P9_ATTR_UID
)) {
1634 if (!(v9iattr
.valid
& P9_ATTR_GID
)) {
1637 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9iattr
.uid
,
1643 if (v9iattr
.valid
& (P9_ATTR_SIZE
)) {
1644 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9iattr
.size
);
1650 trace_v9fs_setattr_return(pdu
->tag
, pdu
->id
);
1654 pdu_complete(pdu
, err
);
1657 static int v9fs_walk_marshal(V9fsPDU
*pdu
, uint16_t nwnames
, V9fsQID
*qids
)
1663 err
= pdu_marshal(pdu
, offset
, "w", nwnames
);
1668 for (i
= 0; i
< nwnames
; i
++) {
1669 err
= pdu_marshal(pdu
, offset
, "Q", &qids
[i
]);
1678 static bool name_is_illegal(const char *name
)
1680 return !*name
|| strchr(name
, '/') != NULL
;
1683 static bool not_same_qid(const V9fsQID
*qid1
, const V9fsQID
*qid2
)
1686 qid1
->type
!= qid2
->type
||
1687 qid1
->version
!= qid2
->version
||
1688 qid1
->path
!= qid2
->path
;
1691 static void coroutine_fn
v9fs_walk(void *opaque
)
1694 V9fsQID
*qids
= NULL
;
1696 V9fsPath dpath
, path
;
1700 int32_t fid
, newfid
;
1701 V9fsString
*wnames
= NULL
;
1703 V9fsFidState
*newfidp
= NULL
;
1704 V9fsPDU
*pdu
= opaque
;
1705 V9fsState
*s
= pdu
->s
;
1708 err
= pdu_unmarshal(pdu
, offset
, "ddw", &fid
, &newfid
, &nwnames
);
1710 pdu_complete(pdu
, err
);
1715 trace_v9fs_walk(pdu
->tag
, pdu
->id
, fid
, newfid
, nwnames
);
1717 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1718 wnames
= g_new0(V9fsString
, nwnames
);
1719 qids
= g_new0(V9fsQID
, nwnames
);
1720 for (i
= 0; i
< nwnames
; i
++) {
1721 err
= pdu_unmarshal(pdu
, offset
, "s", &wnames
[i
]);
1725 if (name_is_illegal(wnames
[i
].data
)) {
1731 } else if (nwnames
> P9_MAXWELEM
) {
1735 fidp
= get_fid(pdu
, fid
);
1741 v9fs_path_init(&dpath
);
1742 v9fs_path_init(&path
);
1744 err
= fid_to_qid(pdu
, fidp
, &qid
);
1750 * Both dpath and path initially poin to fidp.
1751 * Needed to handle request with nwnames == 0
1753 v9fs_path_copy(&dpath
, &fidp
->path
);
1754 v9fs_path_copy(&path
, &fidp
->path
);
1755 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1756 if (not_same_qid(&pdu
->s
->root_qid
, &qid
) ||
1757 strcmp("..", wnames
[name_idx
].data
)) {
1758 err
= v9fs_co_name_to_path(pdu
, &dpath
, wnames
[name_idx
].data
,
1764 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
1768 err
= stat_to_qid(pdu
, &stbuf
, &qid
);
1772 v9fs_path_copy(&dpath
, &path
);
1774 memcpy(&qids
[name_idx
], &qid
, sizeof(qid
));
1776 if (fid
== newfid
) {
1777 if (fidp
->fid_type
!= P9_FID_NONE
) {
1781 v9fs_path_write_lock(s
);
1782 v9fs_path_copy(&fidp
->path
, &path
);
1783 v9fs_path_unlock(s
);
1785 newfidp
= alloc_fid(s
, newfid
);
1786 if (newfidp
== NULL
) {
1790 newfidp
->uid
= fidp
->uid
;
1791 v9fs_path_copy(&newfidp
->path
, &path
);
1793 err
= v9fs_walk_marshal(pdu
, nwnames
, qids
);
1794 trace_v9fs_walk_return(pdu
->tag
, pdu
->id
, nwnames
, qids
);
1798 put_fid(pdu
, newfidp
);
1800 v9fs_path_free(&dpath
);
1801 v9fs_path_free(&path
);
1803 pdu_complete(pdu
, err
);
1804 if (nwnames
&& nwnames
<= P9_MAXWELEM
) {
1805 for (name_idx
= 0; name_idx
< nwnames
; name_idx
++) {
1806 v9fs_string_free(&wnames
[name_idx
]);
1813 static int32_t coroutine_fn
get_iounit(V9fsPDU
*pdu
, V9fsPath
*path
)
1815 struct statfs stbuf
;
1817 V9fsState
*s
= pdu
->s
;
1820 * iounit should be multiples of f_bsize (host filesystem block size
1821 * and as well as less than (client msize - P9_IOHDRSZ))
1823 if (!v9fs_co_statfs(pdu
, path
, &stbuf
)) {
1824 if (stbuf
.f_bsize
) {
1825 iounit
= stbuf
.f_bsize
;
1826 iounit
*= (s
->msize
- P9_IOHDRSZ
) / stbuf
.f_bsize
;
1830 iounit
= s
->msize
- P9_IOHDRSZ
;
1835 static void coroutine_fn
v9fs_open(void *opaque
)
1846 V9fsPDU
*pdu
= opaque
;
1847 V9fsState
*s
= pdu
->s
;
1849 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1850 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &mode
);
1853 err
= pdu_unmarshal(pdu
, offset
, "db", &fid
, &modebyte
);
1859 trace_v9fs_open(pdu
->tag
, pdu
->id
, fid
, mode
);
1861 fidp
= get_fid(pdu
, fid
);
1866 if (fidp
->fid_type
!= P9_FID_NONE
) {
1871 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
1875 err
= stat_to_qid(pdu
, &stbuf
, &qid
);
1879 if (S_ISDIR(stbuf
.st_mode
)) {
1880 err
= v9fs_co_opendir(pdu
, fidp
);
1884 fidp
->fid_type
= P9_FID_DIR
;
1885 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, 0);
1891 if (s
->proto_version
== V9FS_PROTO_2000L
) {
1892 flags
= get_dotl_openflags(s
, mode
);
1894 flags
= omode_to_uflags(mode
);
1896 if (is_ro_export(&s
->ctx
)) {
1897 if (mode
& O_WRONLY
|| mode
& O_RDWR
||
1898 mode
& O_APPEND
|| mode
& O_TRUNC
) {
1903 err
= v9fs_co_open(pdu
, fidp
, flags
);
1907 fidp
->fid_type
= P9_FID_FILE
;
1908 fidp
->open_flags
= flags
;
1909 if (flags
& O_EXCL
) {
1911 * We let the host file system do O_EXCL check
1912 * We should not reclaim such fd
1914 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1916 iounit
= get_iounit(pdu
, &fidp
->path
);
1917 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1923 trace_v9fs_open_return(pdu
->tag
, pdu
->id
,
1924 qid
.type
, qid
.version
, qid
.path
, iounit
);
1928 pdu_complete(pdu
, err
);
1931 static void coroutine_fn
v9fs_lcreate(void *opaque
)
1933 int32_t dfid
, flags
, mode
;
1942 V9fsPDU
*pdu
= opaque
;
1944 v9fs_string_init(&name
);
1945 err
= pdu_unmarshal(pdu
, offset
, "dsddd", &dfid
,
1946 &name
, &flags
, &mode
, &gid
);
1950 trace_v9fs_lcreate(pdu
->tag
, pdu
->id
, dfid
, flags
, mode
, gid
);
1952 if (name_is_illegal(name
.data
)) {
1957 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
1962 fidp
= get_fid(pdu
, dfid
);
1967 if (fidp
->fid_type
!= P9_FID_NONE
) {
1972 flags
= get_dotl_openflags(pdu
->s
, flags
);
1973 err
= v9fs_co_open2(pdu
, fidp
, &name
, gid
,
1974 flags
| O_CREAT
, mode
, &stbuf
);
1978 fidp
->fid_type
= P9_FID_FILE
;
1979 fidp
->open_flags
= flags
;
1980 if (flags
& O_EXCL
) {
1982 * We let the host file system do O_EXCL check
1983 * We should not reclaim such fd
1985 fidp
->flags
|= FID_NON_RECLAIMABLE
;
1987 iounit
= get_iounit(pdu
, &fidp
->path
);
1988 err
= stat_to_qid(pdu
, &stbuf
, &qid
);
1992 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
1997 trace_v9fs_lcreate_return(pdu
->tag
, pdu
->id
,
1998 qid
.type
, qid
.version
, qid
.path
, iounit
);
2002 pdu_complete(pdu
, err
);
2003 v9fs_string_free(&name
);
2006 static void coroutine_fn
v9fs_fsync(void *opaque
)
2013 V9fsPDU
*pdu
= opaque
;
2015 err
= pdu_unmarshal(pdu
, offset
, "dd", &fid
, &datasync
);
2019 trace_v9fs_fsync(pdu
->tag
, pdu
->id
, fid
, datasync
);
2021 fidp
= get_fid(pdu
, fid
);
2026 err
= v9fs_co_fsync(pdu
, fidp
, datasync
);
2032 pdu_complete(pdu
, err
);
2035 static void coroutine_fn
v9fs_clunk(void *opaque
)
2041 V9fsPDU
*pdu
= opaque
;
2042 V9fsState
*s
= pdu
->s
;
2044 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
2048 trace_v9fs_clunk(pdu
->tag
, pdu
->id
, fid
);
2050 fidp
= clunk_fid(s
, fid
);
2056 * Bump the ref so that put_fid will
2060 err
= put_fid(pdu
, fidp
);
2065 pdu_complete(pdu
, err
);
2069 * Create a QEMUIOVector for a sub-region of PDU iovecs
2071 * @qiov: uninitialized QEMUIOVector
2072 * @skip: number of bytes to skip from beginning of PDU
2073 * @size: number of bytes to include
2074 * @is_write: true - write, false - read
2076 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
2077 * with qemu_iovec_destroy().
2079 static void v9fs_init_qiov_from_pdu(QEMUIOVector
*qiov
, V9fsPDU
*pdu
,
2080 size_t skip
, size_t size
,
2088 pdu
->s
->transport
->init_out_iov_from_pdu(pdu
, &iov
, &niov
, size
+ skip
);
2090 pdu
->s
->transport
->init_in_iov_from_pdu(pdu
, &iov
, &niov
, size
+ skip
);
2093 qemu_iovec_init_external(&elem
, iov
, niov
);
2094 qemu_iovec_init(qiov
, niov
);
2095 qemu_iovec_concat(qiov
, &elem
, skip
, size
);
2098 static int v9fs_xattr_read(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2099 uint64_t off
, uint32_t max_count
)
2103 uint64_t read_count
;
2104 QEMUIOVector qiov_full
;
2106 if (fidp
->fs
.xattr
.len
< off
) {
2109 read_count
= fidp
->fs
.xattr
.len
- off
;
2111 if (read_count
> max_count
) {
2112 read_count
= max_count
;
2114 err
= pdu_marshal(pdu
, offset
, "d", read_count
);
2120 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, read_count
, false);
2121 err
= v9fs_pack(qiov_full
.iov
, qiov_full
.niov
, 0,
2122 ((char *)fidp
->fs
.xattr
.value
) + off
,
2124 qemu_iovec_destroy(&qiov_full
);
2132 static int coroutine_fn
v9fs_do_readdir_with_stat(V9fsPDU
*pdu
,
2141 off_t saved_dir_pos
;
2142 struct dirent
*dent
;
2144 /* save the directory position */
2145 saved_dir_pos
= v9fs_co_telldir(pdu
, fidp
);
2146 if (saved_dir_pos
< 0) {
2147 return saved_dir_pos
;
2151 v9fs_path_init(&path
);
2153 v9fs_readdir_lock(&fidp
->fs
.dir
);
2155 err
= v9fs_co_readdir(pdu
, fidp
, &dent
);
2159 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, dent
->d_name
, &path
);
2163 err
= v9fs_co_lstat(pdu
, &path
, &stbuf
);
2167 err
= stat_to_v9stat(pdu
, &path
, dent
->d_name
, &stbuf
, &v9stat
);
2171 if ((count
+ v9stat
.size
+ 2) > max_count
) {
2172 v9fs_readdir_unlock(&fidp
->fs
.dir
);
2174 /* Ran out of buffer. Set dir back to old position and return */
2175 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
2176 v9fs_stat_free(&v9stat
);
2177 v9fs_path_free(&path
);
2181 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
2182 len
= pdu_marshal(pdu
, 11 + count
, "S", &v9stat
);
2184 v9fs_readdir_unlock(&fidp
->fs
.dir
);
2187 v9fs_co_seekdir(pdu
, fidp
, saved_dir_pos
);
2188 v9fs_stat_free(&v9stat
);
2189 v9fs_path_free(&path
);
2193 v9fs_stat_free(&v9stat
);
2194 v9fs_path_free(&path
);
2195 saved_dir_pos
= dent
->d_off
;
2198 v9fs_readdir_unlock(&fidp
->fs
.dir
);
2200 v9fs_path_free(&path
);
2207 static void coroutine_fn
v9fs_read(void *opaque
)
2216 V9fsPDU
*pdu
= opaque
;
2217 V9fsState
*s
= pdu
->s
;
2219 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &max_count
);
2223 trace_v9fs_read(pdu
->tag
, pdu
->id
, fid
, off
, max_count
);
2225 fidp
= get_fid(pdu
, fid
);
2230 if (fidp
->fid_type
== P9_FID_DIR
) {
2231 if (s
->proto_version
!= V9FS_PROTO_2000U
) {
2233 "9p: bad client: T_read request on directory only expected "
2234 "with 9P2000.u protocol version"
2240 v9fs_co_rewinddir(pdu
, fidp
);
2242 count
= v9fs_do_readdir_with_stat(pdu
, fidp
, max_count
);
2247 err
= pdu_marshal(pdu
, offset
, "d", count
);
2251 err
+= offset
+ count
;
2252 } else if (fidp
->fid_type
== P9_FID_FILE
) {
2253 QEMUIOVector qiov_full
;
2257 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
+ 4, max_count
, false);
2258 qemu_iovec_init(&qiov
, qiov_full
.niov
);
2260 qemu_iovec_reset(&qiov
);
2261 qemu_iovec_concat(&qiov
, &qiov_full
, count
, qiov_full
.size
- count
);
2263 print_sg(qiov
.iov
, qiov
.niov
);
2265 /* Loop in case of EINTR */
2267 len
= v9fs_co_preadv(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
2272 } while (len
== -EINTR
&& !pdu
->cancelled
);
2274 /* IO error return the error */
2276 goto out_free_iovec
;
2278 } while (count
< max_count
&& len
> 0);
2279 err
= pdu_marshal(pdu
, offset
, "d", count
);
2281 goto out_free_iovec
;
2283 err
+= offset
+ count
;
2285 qemu_iovec_destroy(&qiov
);
2286 qemu_iovec_destroy(&qiov_full
);
2287 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
2288 err
= v9fs_xattr_read(s
, pdu
, fidp
, off
, max_count
);
2292 trace_v9fs_read_return(pdu
->tag
, pdu
->id
, count
, err
);
2296 pdu_complete(pdu
, err
);
2300 * Returns size required in Rreaddir response for the passed dirent @p name.
2302 * @param name - directory entry's name (i.e. file name, directory name)
2303 * @returns required size in bytes
2305 size_t v9fs_readdir_response_size(V9fsString
*name
)
2308 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
2309 * size of type (1) + size of name.size (2) + strlen(name.data)
2311 return 24 + v9fs_string_size(name
);
2314 static void v9fs_free_dirents(struct V9fsDirEnt
*e
)
2316 struct V9fsDirEnt
*next
= NULL
;
2318 for (; e
; e
= next
) {
2326 static int coroutine_fn
v9fs_do_readdir(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2327 off_t offset
, int32_t max_count
)
2334 struct dirent
*dent
;
2336 struct V9fsDirEnt
*entries
= NULL
;
2339 * inode remapping requires the device id, which in turn might be
2340 * different for different directory entries, so if inode remapping is
2341 * enabled we have to make a full stat for each directory entry
2343 const bool dostat
= pdu
->s
->ctx
.export_flags
& V9FS_REMAP_INODES
;
2346 * Fetch all required directory entries altogether on a background IO
2347 * thread from fs driver. We don't want to do that for each entry
2348 * individually, because hopping between threads (this main IO thread
2349 * and background IO driver thread) would sum up to huge latencies.
2351 count
= v9fs_co_readdir_many(pdu
, fidp
, &entries
, offset
, max_count
,
2360 for (struct V9fsDirEnt
*e
= entries
; e
; e
= e
->next
) {
2363 if (pdu
->s
->ctx
.export_flags
& V9FS_REMAP_INODES
) {
2365 /* e->st should never be NULL, but just to be sure */
2372 err
= stat_to_qid(pdu
, st
, &qid
);
2378 * Fill up just the path field of qid because the client uses
2379 * only that. To fill the entire qid structure we will have
2380 * to stat each dirent found, which is expensive. For the
2381 * latter reason we don't call stat_to_qid() here. Only drawback
2382 * is that no multi-device export detection of stat_to_qid()
2383 * would be done and provided as error to the user here. But
2384 * user would get that error anyway when accessing those
2385 * files/dirs through other ways.
2387 size
= MIN(sizeof(dent
->d_ino
), sizeof(qid
.path
));
2388 memcpy(&qid
.path
, &dent
->d_ino
, size
);
2389 /* Fill the other fields with dummy values */
2394 v9fs_string_init(&name
);
2395 v9fs_string_sprintf(&name
, "%s", dent
->d_name
);
2397 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
2398 len
= pdu_marshal(pdu
, 11 + count
, "Qqbs",
2400 dent
->d_type
, &name
);
2402 v9fs_string_free(&name
);
2413 v9fs_free_dirents(entries
);
2420 static void coroutine_fn
v9fs_readdir(void *opaque
)
2426 uint64_t initial_offset
;
2429 V9fsPDU
*pdu
= opaque
;
2430 V9fsState
*s
= pdu
->s
;
2432 retval
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
,
2433 &initial_offset
, &max_count
);
2437 trace_v9fs_readdir(pdu
->tag
, pdu
->id
, fid
, initial_offset
, max_count
);
2439 /* Enough space for a R_readdir header: size[4] Rreaddir tag[2] count[4] */
2440 if (max_count
> s
->msize
- 11) {
2441 max_count
= s
->msize
- 11;
2443 "9p: bad client: T_readdir with count > msize - 11"
2447 fidp
= get_fid(pdu
, fid
);
2452 if (!fidp
->fs
.dir
.stream
) {
2456 if (s
->proto_version
!= V9FS_PROTO_2000L
) {
2458 "9p: bad client: T_readdir request only expected with 9P2000.L "
2461 retval
= -EOPNOTSUPP
;
2464 count
= v9fs_do_readdir(pdu
, fidp
, (off_t
) initial_offset
, max_count
);
2469 retval
= pdu_marshal(pdu
, offset
, "d", count
);
2473 retval
+= count
+ offset
;
2474 trace_v9fs_readdir_return(pdu
->tag
, pdu
->id
, count
, retval
);
2478 pdu_complete(pdu
, retval
);
2481 static int v9fs_xattr_write(V9fsState
*s
, V9fsPDU
*pdu
, V9fsFidState
*fidp
,
2482 uint64_t off
, uint32_t count
,
2483 struct iovec
*sg
, int cnt
)
2487 uint64_t write_count
;
2491 if (fidp
->fs
.xattr
.len
< off
) {
2494 write_count
= fidp
->fs
.xattr
.len
- off
;
2495 if (write_count
> count
) {
2496 write_count
= count
;
2498 err
= pdu_marshal(pdu
, offset
, "d", write_count
);
2503 fidp
->fs
.xattr
.copied_len
+= write_count
;
2505 * Now copy the content from sg list
2507 for (i
= 0; i
< cnt
; i
++) {
2508 if (write_count
> sg
[i
].iov_len
) {
2509 to_copy
= sg
[i
].iov_len
;
2511 to_copy
= write_count
;
2513 memcpy((char *)fidp
->fs
.xattr
.value
+ off
, sg
[i
].iov_base
, to_copy
);
2514 /* updating vs->off since we are not using below */
2516 write_count
-= to_copy
;
2522 static void coroutine_fn
v9fs_write(void *opaque
)
2532 V9fsPDU
*pdu
= opaque
;
2533 V9fsState
*s
= pdu
->s
;
2534 QEMUIOVector qiov_full
;
2537 err
= pdu_unmarshal(pdu
, offset
, "dqd", &fid
, &off
, &count
);
2539 pdu_complete(pdu
, err
);
2543 v9fs_init_qiov_from_pdu(&qiov_full
, pdu
, offset
, count
, true);
2544 trace_v9fs_write(pdu
->tag
, pdu
->id
, fid
, off
, count
, qiov_full
.niov
);
2546 fidp
= get_fid(pdu
, fid
);
2551 if (fidp
->fid_type
== P9_FID_FILE
) {
2552 if (fidp
->fs
.fd
== -1) {
2556 } else if (fidp
->fid_type
== P9_FID_XATTR
) {
2558 * setxattr operation
2560 err
= v9fs_xattr_write(s
, pdu
, fidp
, off
, count
,
2561 qiov_full
.iov
, qiov_full
.niov
);
2567 qemu_iovec_init(&qiov
, qiov_full
.niov
);
2569 qemu_iovec_reset(&qiov
);
2570 qemu_iovec_concat(&qiov
, &qiov_full
, total
, qiov_full
.size
- total
);
2572 print_sg(qiov
.iov
, qiov
.niov
);
2574 /* Loop in case of EINTR */
2576 len
= v9fs_co_pwritev(pdu
, fidp
, qiov
.iov
, qiov
.niov
, off
);
2581 } while (len
== -EINTR
&& !pdu
->cancelled
);
2583 /* IO error return the error */
2587 } while (total
< count
&& len
> 0);
2590 err
= pdu_marshal(pdu
, offset
, "d", total
);
2595 trace_v9fs_write_return(pdu
->tag
, pdu
->id
, total
, err
);
2597 qemu_iovec_destroy(&qiov
);
2601 qemu_iovec_destroy(&qiov_full
);
2602 pdu_complete(pdu
, err
);
2605 static void coroutine_fn
v9fs_create(void *opaque
)
2617 V9fsString extension
;
2619 V9fsPDU
*pdu
= opaque
;
2620 V9fsState
*s
= pdu
->s
;
2622 v9fs_path_init(&path
);
2623 v9fs_string_init(&name
);
2624 v9fs_string_init(&extension
);
2625 err
= pdu_unmarshal(pdu
, offset
, "dsdbs", &fid
, &name
,
2626 &perm
, &mode
, &extension
);
2630 trace_v9fs_create(pdu
->tag
, pdu
->id
, fid
, name
.data
, perm
, mode
);
2632 if (name_is_illegal(name
.data
)) {
2637 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2642 fidp
= get_fid(pdu
, fid
);
2647 if (fidp
->fid_type
!= P9_FID_NONE
) {
2651 if (perm
& P9_STAT_MODE_DIR
) {
2652 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, perm
& 0777,
2653 fidp
->uid
, -1, &stbuf
);
2657 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2661 v9fs_path_write_lock(s
);
2662 v9fs_path_copy(&fidp
->path
, &path
);
2663 v9fs_path_unlock(s
);
2664 err
= v9fs_co_opendir(pdu
, fidp
);
2668 fidp
->fid_type
= P9_FID_DIR
;
2669 } else if (perm
& P9_STAT_MODE_SYMLINK
) {
2670 err
= v9fs_co_symlink(pdu
, fidp
, &name
,
2671 extension
.data
, -1 , &stbuf
);
2675 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2679 v9fs_path_write_lock(s
);
2680 v9fs_path_copy(&fidp
->path
, &path
);
2681 v9fs_path_unlock(s
);
2682 } else if (perm
& P9_STAT_MODE_LINK
) {
2683 int32_t ofid
= atoi(extension
.data
);
2684 V9fsFidState
*ofidp
= get_fid(pdu
, ofid
);
2685 if (ofidp
== NULL
) {
2689 err
= v9fs_co_link(pdu
, ofidp
, fidp
, &name
);
2690 put_fid(pdu
, ofidp
);
2694 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2696 fidp
->fid_type
= P9_FID_NONE
;
2699 v9fs_path_write_lock(s
);
2700 v9fs_path_copy(&fidp
->path
, &path
);
2701 v9fs_path_unlock(s
);
2702 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
2704 fidp
->fid_type
= P9_FID_NONE
;
2707 } else if (perm
& P9_STAT_MODE_DEVICE
) {
2709 uint32_t major
, minor
;
2712 if (sscanf(extension
.data
, "%c %u %u", &ctype
, &major
, &minor
) != 3) {
2729 nmode
|= perm
& 0777;
2730 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2731 makedev(major
, minor
), nmode
, &stbuf
);
2735 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2739 v9fs_path_write_lock(s
);
2740 v9fs_path_copy(&fidp
->path
, &path
);
2741 v9fs_path_unlock(s
);
2742 } else if (perm
& P9_STAT_MODE_NAMED_PIPE
) {
2743 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2744 0, S_IFIFO
| (perm
& 0777), &stbuf
);
2748 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2752 v9fs_path_write_lock(s
);
2753 v9fs_path_copy(&fidp
->path
, &path
);
2754 v9fs_path_unlock(s
);
2755 } else if (perm
& P9_STAT_MODE_SOCKET
) {
2756 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, -1,
2757 0, S_IFSOCK
| (perm
& 0777), &stbuf
);
2761 err
= v9fs_co_name_to_path(pdu
, &fidp
->path
, name
.data
, &path
);
2765 v9fs_path_write_lock(s
);
2766 v9fs_path_copy(&fidp
->path
, &path
);
2767 v9fs_path_unlock(s
);
2769 err
= v9fs_co_open2(pdu
, fidp
, &name
, -1,
2770 omode_to_uflags(mode
)|O_CREAT
, perm
, &stbuf
);
2774 fidp
->fid_type
= P9_FID_FILE
;
2775 fidp
->open_flags
= omode_to_uflags(mode
);
2776 if (fidp
->open_flags
& O_EXCL
) {
2778 * We let the host file system do O_EXCL check
2779 * We should not reclaim such fd
2781 fidp
->flags
|= FID_NON_RECLAIMABLE
;
2784 iounit
= get_iounit(pdu
, &fidp
->path
);
2785 err
= stat_to_qid(pdu
, &stbuf
, &qid
);
2789 err
= pdu_marshal(pdu
, offset
, "Qd", &qid
, iounit
);
2794 trace_v9fs_create_return(pdu
->tag
, pdu
->id
,
2795 qid
.type
, qid
.version
, qid
.path
, iounit
);
2799 pdu_complete(pdu
, err
);
2800 v9fs_string_free(&name
);
2801 v9fs_string_free(&extension
);
2802 v9fs_path_free(&path
);
2805 static void coroutine_fn
v9fs_symlink(void *opaque
)
2807 V9fsPDU
*pdu
= opaque
;
2810 V9fsFidState
*dfidp
;
2818 v9fs_string_init(&name
);
2819 v9fs_string_init(&symname
);
2820 err
= pdu_unmarshal(pdu
, offset
, "dssd", &dfid
, &name
, &symname
, &gid
);
2824 trace_v9fs_symlink(pdu
->tag
, pdu
->id
, dfid
, name
.data
, symname
.data
, gid
);
2826 if (name_is_illegal(name
.data
)) {
2831 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2836 dfidp
= get_fid(pdu
, dfid
);
2837 if (dfidp
== NULL
) {
2841 err
= v9fs_co_symlink(pdu
, dfidp
, &name
, symname
.data
, gid
, &stbuf
);
2845 err
= stat_to_qid(pdu
, &stbuf
, &qid
);
2849 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
2854 trace_v9fs_symlink_return(pdu
->tag
, pdu
->id
,
2855 qid
.type
, qid
.version
, qid
.path
);
2857 put_fid(pdu
, dfidp
);
2859 pdu_complete(pdu
, err
);
2860 v9fs_string_free(&name
);
2861 v9fs_string_free(&symname
);
2864 static void coroutine_fn
v9fs_flush(void *opaque
)
2869 V9fsPDU
*cancel_pdu
= NULL
;
2870 V9fsPDU
*pdu
= opaque
;
2871 V9fsState
*s
= pdu
->s
;
2873 err
= pdu_unmarshal(pdu
, offset
, "w", &tag
);
2875 pdu_complete(pdu
, err
);
2878 trace_v9fs_flush(pdu
->tag
, pdu
->id
, tag
);
2880 if (pdu
->tag
== tag
) {
2881 warn_report("the guest sent a self-referencing 9P flush request");
2883 QLIST_FOREACH(cancel_pdu
, &s
->active_list
, next
) {
2884 if (cancel_pdu
->tag
== tag
) {
2890 cancel_pdu
->cancelled
= 1;
2892 * Wait for pdu to complete.
2894 qemu_co_queue_wait(&cancel_pdu
->complete
, NULL
);
2895 if (!qemu_co_queue_next(&cancel_pdu
->complete
)) {
2896 cancel_pdu
->cancelled
= 0;
2897 pdu_free(cancel_pdu
);
2900 pdu_complete(pdu
, 7);
2903 static void coroutine_fn
v9fs_link(void *opaque
)
2905 V9fsPDU
*pdu
= opaque
;
2906 int32_t dfid
, oldfid
;
2907 V9fsFidState
*dfidp
, *oldfidp
;
2912 v9fs_string_init(&name
);
2913 err
= pdu_unmarshal(pdu
, offset
, "dds", &dfid
, &oldfid
, &name
);
2917 trace_v9fs_link(pdu
->tag
, pdu
->id
, dfid
, oldfid
, name
.data
);
2919 if (name_is_illegal(name
.data
)) {
2924 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
2929 dfidp
= get_fid(pdu
, dfid
);
2930 if (dfidp
== NULL
) {
2935 oldfidp
= get_fid(pdu
, oldfid
);
2936 if (oldfidp
== NULL
) {
2940 err
= v9fs_co_link(pdu
, oldfidp
, dfidp
, &name
);
2944 put_fid(pdu
, oldfidp
);
2946 put_fid(pdu
, dfidp
);
2948 v9fs_string_free(&name
);
2949 pdu_complete(pdu
, err
);
2952 /* Only works with path name based fid */
2953 static void coroutine_fn
v9fs_remove(void *opaque
)
2959 V9fsPDU
*pdu
= opaque
;
2961 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
2965 trace_v9fs_remove(pdu
->tag
, pdu
->id
, fid
);
2967 fidp
= get_fid(pdu
, fid
);
2972 /* if fs driver is not path based, return EOPNOTSUPP */
2973 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
2978 * IF the file is unlinked, we cannot reopen
2979 * the file later. So don't reclaim fd
2981 err
= v9fs_mark_fids_unreclaim(pdu
, &fidp
->path
);
2985 err
= v9fs_co_remove(pdu
, &fidp
->path
);
2990 /* For TREMOVE we need to clunk the fid even on failed remove */
2991 clunk_fid(pdu
->s
, fidp
->fid
);
2994 pdu_complete(pdu
, err
);
2997 static void coroutine_fn
v9fs_unlinkat(void *opaque
)
3001 int32_t dfid
, flags
, rflags
= 0;
3004 V9fsFidState
*dfidp
;
3005 V9fsPDU
*pdu
= opaque
;
3007 v9fs_string_init(&name
);
3008 err
= pdu_unmarshal(pdu
, offset
, "dsd", &dfid
, &name
, &flags
);
3013 if (name_is_illegal(name
.data
)) {
3018 if (!strcmp(".", name
.data
)) {
3023 if (!strcmp("..", name
.data
)) {
3028 if (flags
& ~P9_DOTL_AT_REMOVEDIR
) {
3033 if (flags
& P9_DOTL_AT_REMOVEDIR
) {
3034 rflags
|= AT_REMOVEDIR
;
3037 dfidp
= get_fid(pdu
, dfid
);
3038 if (dfidp
== NULL
) {
3043 * IF the file is unlinked, we cannot reopen
3044 * the file later. So don't reclaim fd
3046 v9fs_path_init(&path
);
3047 err
= v9fs_co_name_to_path(pdu
, &dfidp
->path
, name
.data
, &path
);
3051 err
= v9fs_mark_fids_unreclaim(pdu
, &path
);
3055 err
= v9fs_co_unlinkat(pdu
, &dfidp
->path
, &name
, rflags
);
3060 put_fid(pdu
, dfidp
);
3061 v9fs_path_free(&path
);
3063 pdu_complete(pdu
, err
);
3064 v9fs_string_free(&name
);
3068 /* Only works with path name based fid */
3069 static int coroutine_fn
v9fs_complete_rename(V9fsPDU
*pdu
, V9fsFidState
*fidp
,
3075 V9fsFidState
*tfidp
;
3076 V9fsState
*s
= pdu
->s
;
3077 V9fsFidState
*dirfidp
= NULL
;
3079 v9fs_path_init(&new_path
);
3080 if (newdirfid
!= -1) {
3081 dirfidp
= get_fid(pdu
, newdirfid
);
3082 if (dirfidp
== NULL
) {
3085 if (fidp
->fid_type
!= P9_FID_NONE
) {
3089 err
= v9fs_co_name_to_path(pdu
, &dirfidp
->path
, name
->data
, &new_path
);
3094 char *dir_name
= g_path_get_dirname(fidp
->path
.data
);
3097 v9fs_path_init(&dir_path
);
3098 v9fs_path_sprintf(&dir_path
, "%s", dir_name
);
3101 err
= v9fs_co_name_to_path(pdu
, &dir_path
, name
->data
, &new_path
);
3102 v9fs_path_free(&dir_path
);
3107 err
= v9fs_co_rename(pdu
, &fidp
->path
, &new_path
);
3112 * Fixup fid's pointing to the old name to
3113 * start pointing to the new name
3115 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
3116 if (v9fs_path_is_ancestor(&fidp
->path
, &tfidp
->path
)) {
3117 /* replace the name */
3118 v9fs_fix_path(&tfidp
->path
, &new_path
, strlen(fidp
->path
.data
));
3123 put_fid(pdu
, dirfidp
);
3125 v9fs_path_free(&new_path
);
3129 /* Only works with path name based fid */
3130 static void coroutine_fn
v9fs_rename(void *opaque
)
3138 V9fsPDU
*pdu
= opaque
;
3139 V9fsState
*s
= pdu
->s
;
3141 v9fs_string_init(&name
);
3142 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newdirfid
, &name
);
3147 if (name_is_illegal(name
.data
)) {
3152 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3157 fidp
= get_fid(pdu
, fid
);
3162 if (fidp
->fid_type
!= P9_FID_NONE
) {
3166 /* if fs driver is not path based, return EOPNOTSUPP */
3167 if (!(pdu
->s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
)) {
3171 v9fs_path_write_lock(s
);
3172 err
= v9fs_complete_rename(pdu
, fidp
, newdirfid
, &name
);
3173 v9fs_path_unlock(s
);
3180 pdu_complete(pdu
, err
);
3181 v9fs_string_free(&name
);
3184 static int coroutine_fn
v9fs_fix_fid_paths(V9fsPDU
*pdu
, V9fsPath
*olddir
,
3185 V9fsString
*old_name
,
3187 V9fsString
*new_name
)
3189 V9fsFidState
*tfidp
;
3190 V9fsPath oldpath
, newpath
;
3191 V9fsState
*s
= pdu
->s
;
3194 v9fs_path_init(&oldpath
);
3195 v9fs_path_init(&newpath
);
3196 err
= v9fs_co_name_to_path(pdu
, olddir
, old_name
->data
, &oldpath
);
3200 err
= v9fs_co_name_to_path(pdu
, newdir
, new_name
->data
, &newpath
);
3206 * Fixup fid's pointing to the old name to
3207 * start pointing to the new name
3209 for (tfidp
= s
->fid_list
; tfidp
; tfidp
= tfidp
->next
) {
3210 if (v9fs_path_is_ancestor(&oldpath
, &tfidp
->path
)) {
3211 /* replace the name */
3212 v9fs_fix_path(&tfidp
->path
, &newpath
, strlen(oldpath
.data
));
3216 v9fs_path_free(&oldpath
);
3217 v9fs_path_free(&newpath
);
3221 static int coroutine_fn
v9fs_complete_renameat(V9fsPDU
*pdu
, int32_t olddirfid
,
3222 V9fsString
*old_name
,
3224 V9fsString
*new_name
)
3227 V9fsState
*s
= pdu
->s
;
3228 V9fsFidState
*newdirfidp
= NULL
, *olddirfidp
= NULL
;
3230 olddirfidp
= get_fid(pdu
, olddirfid
);
3231 if (olddirfidp
== NULL
) {
3235 if (newdirfid
!= -1) {
3236 newdirfidp
= get_fid(pdu
, newdirfid
);
3237 if (newdirfidp
== NULL
) {
3242 newdirfidp
= get_fid(pdu
, olddirfid
);
3245 err
= v9fs_co_renameat(pdu
, &olddirfidp
->path
, old_name
,
3246 &newdirfidp
->path
, new_name
);
3250 if (s
->ctx
.export_flags
& V9FS_PATHNAME_FSCONTEXT
) {
3251 /* Only for path based fid we need to do the below fixup */
3252 err
= v9fs_fix_fid_paths(pdu
, &olddirfidp
->path
, old_name
,
3253 &newdirfidp
->path
, new_name
);
3257 put_fid(pdu
, olddirfidp
);
3260 put_fid(pdu
, newdirfidp
);
3265 static void coroutine_fn
v9fs_renameat(void *opaque
)
3269 V9fsPDU
*pdu
= opaque
;
3270 V9fsState
*s
= pdu
->s
;
3271 int32_t olddirfid
, newdirfid
;
3272 V9fsString old_name
, new_name
;
3274 v9fs_string_init(&old_name
);
3275 v9fs_string_init(&new_name
);
3276 err
= pdu_unmarshal(pdu
, offset
, "dsds", &olddirfid
,
3277 &old_name
, &newdirfid
, &new_name
);
3282 if (name_is_illegal(old_name
.data
) || name_is_illegal(new_name
.data
)) {
3287 if (!strcmp(".", old_name
.data
) || !strcmp("..", old_name
.data
) ||
3288 !strcmp(".", new_name
.data
) || !strcmp("..", new_name
.data
)) {
3293 v9fs_path_write_lock(s
);
3294 err
= v9fs_complete_renameat(pdu
, olddirfid
,
3295 &old_name
, newdirfid
, &new_name
);
3296 v9fs_path_unlock(s
);
3302 pdu_complete(pdu
, err
);
3303 v9fs_string_free(&old_name
);
3304 v9fs_string_free(&new_name
);
3307 static void coroutine_fn
v9fs_wstat(void *opaque
)
3316 V9fsPDU
*pdu
= opaque
;
3317 V9fsState
*s
= pdu
->s
;
3319 v9fs_stat_init(&v9stat
);
3320 err
= pdu_unmarshal(pdu
, offset
, "dwS", &fid
, &unused
, &v9stat
);
3324 trace_v9fs_wstat(pdu
->tag
, pdu
->id
, fid
,
3325 v9stat
.mode
, v9stat
.atime
, v9stat
.mtime
);
3327 fidp
= get_fid(pdu
, fid
);
3332 /* do we need to sync the file? */
3333 if (donttouch_stat(&v9stat
)) {
3334 err
= v9fs_co_fsync(pdu
, fidp
, 0);
3337 if (v9stat
.mode
!= -1) {
3339 err
= v9fs_co_lstat(pdu
, &fidp
->path
, &stbuf
);
3343 v9_mode
= stat_to_v9mode(&stbuf
);
3344 if ((v9stat
.mode
& P9_STAT_MODE_TYPE_BITS
) !=
3345 (v9_mode
& P9_STAT_MODE_TYPE_BITS
)) {
3346 /* Attempting to change the type */
3350 err
= v9fs_co_chmod(pdu
, &fidp
->path
,
3351 v9mode_to_mode(v9stat
.mode
,
3352 &v9stat
.extension
));
3357 if (v9stat
.mtime
!= -1 || v9stat
.atime
!= -1) {
3358 struct timespec times
[2];
3359 if (v9stat
.atime
!= -1) {
3360 times
[0].tv_sec
= v9stat
.atime
;
3361 times
[0].tv_nsec
= 0;
3363 times
[0].tv_nsec
= UTIME_OMIT
;
3365 if (v9stat
.mtime
!= -1) {
3366 times
[1].tv_sec
= v9stat
.mtime
;
3367 times
[1].tv_nsec
= 0;
3369 times
[1].tv_nsec
= UTIME_OMIT
;
3371 err
= v9fs_co_utimensat(pdu
, &fidp
->path
, times
);
3376 if (v9stat
.n_gid
!= -1 || v9stat
.n_uid
!= -1) {
3377 err
= v9fs_co_chown(pdu
, &fidp
->path
, v9stat
.n_uid
, v9stat
.n_gid
);
3382 if (v9stat
.name
.size
!= 0) {
3383 v9fs_path_write_lock(s
);
3384 err
= v9fs_complete_rename(pdu
, fidp
, -1, &v9stat
.name
);
3385 v9fs_path_unlock(s
);
3390 if (v9stat
.length
!= -1) {
3391 err
= v9fs_co_truncate(pdu
, &fidp
->path
, v9stat
.length
);
3400 v9fs_stat_free(&v9stat
);
3401 pdu_complete(pdu
, err
);
3404 static int v9fs_fill_statfs(V9fsState
*s
, V9fsPDU
*pdu
, struct statfs
*stbuf
)
3416 int32_t bsize_factor
;
3419 * compute bsize factor based on host file system block size
3422 bsize_factor
= (s
->msize
- P9_IOHDRSZ
)/stbuf
->f_bsize
;
3423 if (!bsize_factor
) {
3426 f_type
= stbuf
->f_type
;
3427 f_bsize
= stbuf
->f_bsize
;
3428 f_bsize
*= bsize_factor
;
3430 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
3431 * adjust(divide) the number of blocks, free blocks and available
3432 * blocks by bsize factor
3434 f_blocks
= stbuf
->f_blocks
/bsize_factor
;
3435 f_bfree
= stbuf
->f_bfree
/bsize_factor
;
3436 f_bavail
= stbuf
->f_bavail
/bsize_factor
;
3437 f_files
= stbuf
->f_files
;
3438 f_ffree
= stbuf
->f_ffree
;
3439 fsid_val
= (unsigned int) stbuf
->f_fsid
.__val
[0] |
3440 (unsigned long long)stbuf
->f_fsid
.__val
[1] << 32;
3441 f_namelen
= stbuf
->f_namelen
;
3443 return pdu_marshal(pdu
, offset
, "ddqqqqqqd",
3444 f_type
, f_bsize
, f_blocks
, f_bfree
,
3445 f_bavail
, f_files
, f_ffree
,
3446 fsid_val
, f_namelen
);
3449 static void coroutine_fn
v9fs_statfs(void *opaque
)
3455 struct statfs stbuf
;
3456 V9fsPDU
*pdu
= opaque
;
3457 V9fsState
*s
= pdu
->s
;
3459 retval
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
3463 fidp
= get_fid(pdu
, fid
);
3468 retval
= v9fs_co_statfs(pdu
, &fidp
->path
, &stbuf
);
3472 retval
= v9fs_fill_statfs(s
, pdu
, &stbuf
);
3480 pdu_complete(pdu
, retval
);
3483 static void coroutine_fn
v9fs_mknod(void *opaque
)
3496 V9fsPDU
*pdu
= opaque
;
3498 v9fs_string_init(&name
);
3499 err
= pdu_unmarshal(pdu
, offset
, "dsdddd", &fid
, &name
, &mode
,
3500 &major
, &minor
, &gid
);
3504 trace_v9fs_mknod(pdu
->tag
, pdu
->id
, fid
, mode
, major
, minor
);
3506 if (name_is_illegal(name
.data
)) {
3511 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3516 fidp
= get_fid(pdu
, fid
);
3521 err
= v9fs_co_mknod(pdu
, fidp
, &name
, fidp
->uid
, gid
,
3522 makedev(major
, minor
), mode
, &stbuf
);
3526 err
= stat_to_qid(pdu
, &stbuf
, &qid
);
3530 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3535 trace_v9fs_mknod_return(pdu
->tag
, pdu
->id
,
3536 qid
.type
, qid
.version
, qid
.path
);
3540 pdu_complete(pdu
, err
);
3541 v9fs_string_free(&name
);
3545 * Implement posix byte range locking code
3546 * Server side handling of locking code is very simple, because 9p server in
3547 * QEMU can handle only one client. And most of the lock handling
3548 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3549 * do any thing in * qemu 9p server side lock code path.
3550 * So when a TLOCK request comes, always return success
3552 static void coroutine_fn
v9fs_lock(void *opaque
)
3558 int32_t fid
, err
= 0;
3559 V9fsPDU
*pdu
= opaque
;
3561 v9fs_string_init(&flock
.client_id
);
3562 err
= pdu_unmarshal(pdu
, offset
, "dbdqqds", &fid
, &flock
.type
,
3563 &flock
.flags
, &flock
.start
, &flock
.length
,
3564 &flock
.proc_id
, &flock
.client_id
);
3568 trace_v9fs_lock(pdu
->tag
, pdu
->id
, fid
,
3569 flock
.type
, flock
.start
, flock
.length
);
3572 /* We support only block flag now (that too ignored currently) */
3573 if (flock
.flags
& ~P9_LOCK_FLAGS_BLOCK
) {
3577 fidp
= get_fid(pdu
, fid
);
3582 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3586 err
= pdu_marshal(pdu
, offset
, "b", P9_LOCK_SUCCESS
);
3591 trace_v9fs_lock_return(pdu
->tag
, pdu
->id
, P9_LOCK_SUCCESS
);
3595 pdu_complete(pdu
, err
);
3596 v9fs_string_free(&flock
.client_id
);
3600 * When a TGETLOCK request comes, always return success because all lock
3601 * handling is done by client's VFS layer.
3603 static void coroutine_fn
v9fs_getlock(void *opaque
)
3609 int32_t fid
, err
= 0;
3610 V9fsPDU
*pdu
= opaque
;
3612 v9fs_string_init(&glock
.client_id
);
3613 err
= pdu_unmarshal(pdu
, offset
, "dbqqds", &fid
, &glock
.type
,
3614 &glock
.start
, &glock
.length
, &glock
.proc_id
,
3619 trace_v9fs_getlock(pdu
->tag
, pdu
->id
, fid
,
3620 glock
.type
, glock
.start
, glock
.length
);
3622 fidp
= get_fid(pdu
, fid
);
3627 err
= v9fs_co_fstat(pdu
, fidp
, &stbuf
);
3631 glock
.type
= P9_LOCK_TYPE_UNLCK
;
3632 err
= pdu_marshal(pdu
, offset
, "bqqds", glock
.type
,
3633 glock
.start
, glock
.length
, glock
.proc_id
,
3639 trace_v9fs_getlock_return(pdu
->tag
, pdu
->id
, glock
.type
, glock
.start
,
3640 glock
.length
, glock
.proc_id
);
3644 pdu_complete(pdu
, err
);
3645 v9fs_string_free(&glock
.client_id
);
3648 static void coroutine_fn
v9fs_mkdir(void *opaque
)
3650 V9fsPDU
*pdu
= opaque
;
3661 v9fs_string_init(&name
);
3662 err
= pdu_unmarshal(pdu
, offset
, "dsdd", &fid
, &name
, &mode
, &gid
);
3666 trace_v9fs_mkdir(pdu
->tag
, pdu
->id
, fid
, name
.data
, mode
, gid
);
3668 if (name_is_illegal(name
.data
)) {
3673 if (!strcmp(".", name
.data
) || !strcmp("..", name
.data
)) {
3678 fidp
= get_fid(pdu
, fid
);
3683 err
= v9fs_co_mkdir(pdu
, fidp
, &name
, mode
, fidp
->uid
, gid
, &stbuf
);
3687 err
= stat_to_qid(pdu
, &stbuf
, &qid
);
3691 err
= pdu_marshal(pdu
, offset
, "Q", &qid
);
3696 trace_v9fs_mkdir_return(pdu
->tag
, pdu
->id
,
3697 qid
.type
, qid
.version
, qid
.path
, err
);
3701 pdu_complete(pdu
, err
);
3702 v9fs_string_free(&name
);
3705 static void coroutine_fn
v9fs_xattrwalk(void *opaque
)
3711 int32_t fid
, newfid
;
3712 V9fsFidState
*file_fidp
;
3713 V9fsFidState
*xattr_fidp
= NULL
;
3714 V9fsPDU
*pdu
= opaque
;
3715 V9fsState
*s
= pdu
->s
;
3717 v9fs_string_init(&name
);
3718 err
= pdu_unmarshal(pdu
, offset
, "dds", &fid
, &newfid
, &name
);
3722 trace_v9fs_xattrwalk(pdu
->tag
, pdu
->id
, fid
, newfid
, name
.data
);
3724 file_fidp
= get_fid(pdu
, fid
);
3725 if (file_fidp
== NULL
) {
3729 xattr_fidp
= alloc_fid(s
, newfid
);
3730 if (xattr_fidp
== NULL
) {
3734 v9fs_path_copy(&xattr_fidp
->path
, &file_fidp
->path
);
3735 if (!v9fs_string_size(&name
)) {
3737 * listxattr request. Get the size first
3739 size
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
, NULL
, 0);
3742 clunk_fid(s
, xattr_fidp
->fid
);
3746 * Read the xattr value
3748 xattr_fidp
->fs
.xattr
.len
= size
;
3749 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3750 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3751 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3753 err
= v9fs_co_llistxattr(pdu
, &xattr_fidp
->path
,
3754 xattr_fidp
->fs
.xattr
.value
,
3755 xattr_fidp
->fs
.xattr
.len
);
3757 clunk_fid(s
, xattr_fidp
->fid
);
3761 err
= pdu_marshal(pdu
, offset
, "q", size
);
3768 * specific xattr fid. We check for xattr
3769 * presence also collect the xattr size
3771 size
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3775 clunk_fid(s
, xattr_fidp
->fid
);
3779 * Read the xattr value
3781 xattr_fidp
->fs
.xattr
.len
= size
;
3782 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3783 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= true;
3784 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3786 err
= v9fs_co_lgetxattr(pdu
, &xattr_fidp
->path
,
3787 &name
, xattr_fidp
->fs
.xattr
.value
,
3788 xattr_fidp
->fs
.xattr
.len
);
3790 clunk_fid(s
, xattr_fidp
->fid
);
3794 err
= pdu_marshal(pdu
, offset
, "q", size
);
3800 trace_v9fs_xattrwalk_return(pdu
->tag
, pdu
->id
, size
);
3802 put_fid(pdu
, file_fidp
);
3804 put_fid(pdu
, xattr_fidp
);
3807 pdu_complete(pdu
, err
);
3808 v9fs_string_free(&name
);
3811 static void coroutine_fn
v9fs_xattrcreate(void *opaque
)
3813 int flags
, rflags
= 0;
3819 V9fsFidState
*file_fidp
;
3820 V9fsFidState
*xattr_fidp
;
3821 V9fsPDU
*pdu
= opaque
;
3823 v9fs_string_init(&name
);
3824 err
= pdu_unmarshal(pdu
, offset
, "dsqd", &fid
, &name
, &size
, &flags
);
3828 trace_v9fs_xattrcreate(pdu
->tag
, pdu
->id
, fid
, name
.data
, size
, flags
);
3830 if (flags
& ~(P9_XATTR_CREATE
| P9_XATTR_REPLACE
)) {
3835 if (flags
& P9_XATTR_CREATE
) {
3836 rflags
|= XATTR_CREATE
;
3839 if (flags
& P9_XATTR_REPLACE
) {
3840 rflags
|= XATTR_REPLACE
;
3843 if (size
> XATTR_SIZE_MAX
) {
3848 file_fidp
= get_fid(pdu
, fid
);
3849 if (file_fidp
== NULL
) {
3853 if (file_fidp
->fid_type
!= P9_FID_NONE
) {
3858 /* Make the file fid point to xattr */
3859 xattr_fidp
= file_fidp
;
3860 xattr_fidp
->fid_type
= P9_FID_XATTR
;
3861 xattr_fidp
->fs
.xattr
.copied_len
= 0;
3862 xattr_fidp
->fs
.xattr
.xattrwalk_fid
= false;
3863 xattr_fidp
->fs
.xattr
.len
= size
;
3864 xattr_fidp
->fs
.xattr
.flags
= rflags
;
3865 v9fs_string_init(&xattr_fidp
->fs
.xattr
.name
);
3866 v9fs_string_copy(&xattr_fidp
->fs
.xattr
.name
, &name
);
3867 xattr_fidp
->fs
.xattr
.value
= g_malloc0(size
);
3870 put_fid(pdu
, file_fidp
);
3872 pdu_complete(pdu
, err
);
3873 v9fs_string_free(&name
);
3876 static void coroutine_fn
v9fs_readlink(void *opaque
)
3878 V9fsPDU
*pdu
= opaque
;
3885 err
= pdu_unmarshal(pdu
, offset
, "d", &fid
);
3889 trace_v9fs_readlink(pdu
->tag
, pdu
->id
, fid
);
3890 fidp
= get_fid(pdu
, fid
);
3896 v9fs_string_init(&target
);
3897 err
= v9fs_co_readlink(pdu
, &fidp
->path
, &target
);
3901 err
= pdu_marshal(pdu
, offset
, "s", &target
);
3903 v9fs_string_free(&target
);
3907 trace_v9fs_readlink_return(pdu
->tag
, pdu
->id
, target
.data
);
3908 v9fs_string_free(&target
);
3912 pdu_complete(pdu
, err
);
3915 static CoroutineEntry
*pdu_co_handlers
[] = {
3916 [P9_TREADDIR
] = v9fs_readdir
,
3917 [P9_TSTATFS
] = v9fs_statfs
,
3918 [P9_TGETATTR
] = v9fs_getattr
,
3919 [P9_TSETATTR
] = v9fs_setattr
,
3920 [P9_TXATTRWALK
] = v9fs_xattrwalk
,
3921 [P9_TXATTRCREATE
] = v9fs_xattrcreate
,
3922 [P9_TMKNOD
] = v9fs_mknod
,
3923 [P9_TRENAME
] = v9fs_rename
,
3924 [P9_TLOCK
] = v9fs_lock
,
3925 [P9_TGETLOCK
] = v9fs_getlock
,
3926 [P9_TRENAMEAT
] = v9fs_renameat
,
3927 [P9_TREADLINK
] = v9fs_readlink
,
3928 [P9_TUNLINKAT
] = v9fs_unlinkat
,
3929 [P9_TMKDIR
] = v9fs_mkdir
,
3930 [P9_TVERSION
] = v9fs_version
,
3931 [P9_TLOPEN
] = v9fs_open
,
3932 [P9_TATTACH
] = v9fs_attach
,
3933 [P9_TSTAT
] = v9fs_stat
,
3934 [P9_TWALK
] = v9fs_walk
,
3935 [P9_TCLUNK
] = v9fs_clunk
,
3936 [P9_TFSYNC
] = v9fs_fsync
,
3937 [P9_TOPEN
] = v9fs_open
,
3938 [P9_TREAD
] = v9fs_read
,
3940 [P9_TAUTH
] = v9fs_auth
,
3942 [P9_TFLUSH
] = v9fs_flush
,
3943 [P9_TLINK
] = v9fs_link
,
3944 [P9_TSYMLINK
] = v9fs_symlink
,
3945 [P9_TCREATE
] = v9fs_create
,
3946 [P9_TLCREATE
] = v9fs_lcreate
,
3947 [P9_TWRITE
] = v9fs_write
,
3948 [P9_TWSTAT
] = v9fs_wstat
,
3949 [P9_TREMOVE
] = v9fs_remove
,
3952 static void coroutine_fn
v9fs_op_not_supp(void *opaque
)
3954 V9fsPDU
*pdu
= opaque
;
3955 pdu_complete(pdu
, -EOPNOTSUPP
);
3958 static void coroutine_fn
v9fs_fs_ro(void *opaque
)
3960 V9fsPDU
*pdu
= opaque
;
3961 pdu_complete(pdu
, -EROFS
);
3964 static inline bool is_read_only_op(V9fsPDU
*pdu
)
3991 void pdu_submit(V9fsPDU
*pdu
, P9MsgHeader
*hdr
)
3994 CoroutineEntry
*handler
;
3995 V9fsState
*s
= pdu
->s
;
3997 pdu
->size
= le32_to_cpu(hdr
->size_le
);
3999 pdu
->tag
= le16_to_cpu(hdr
->tag_le
);
4001 if (pdu
->id
>= ARRAY_SIZE(pdu_co_handlers
) ||
4002 (pdu_co_handlers
[pdu
->id
] == NULL
)) {
4003 handler
= v9fs_op_not_supp
;
4004 } else if (is_ro_export(&s
->ctx
) && !is_read_only_op(pdu
)) {
4005 handler
= v9fs_fs_ro
;
4007 handler
= pdu_co_handlers
[pdu
->id
];
4010 qemu_co_queue_init(&pdu
->complete
);
4011 co
= qemu_coroutine_create(handler
, pdu
);
4012 qemu_coroutine_enter(co
);
4015 /* Returns 0 on success, 1 on failure. */
4016 int v9fs_device_realize_common(V9fsState
*s
, const V9fsTransport
*t
,
4026 assert(!s
->transport
);
4029 /* initialize pdu allocator */
4030 QLIST_INIT(&s
->free_list
);
4031 QLIST_INIT(&s
->active_list
);
4032 for (i
= 0; i
< MAX_REQ
; i
++) {
4033 QLIST_INSERT_HEAD(&s
->free_list
, &s
->pdus
[i
], next
);
4038 v9fs_path_init(&path
);
4040 fse
= get_fsdev_fsentry(s
->fsconf
.fsdev_id
);
4043 /* We don't have a fsdev identified by fsdev_id */
4044 error_setg(errp
, "9pfs device couldn't find fsdev with the "
4046 s
->fsconf
.fsdev_id
? s
->fsconf
.fsdev_id
: "NULL");
4050 if (!s
->fsconf
.tag
) {
4051 /* we haven't specified a mount_tag */
4052 error_setg(errp
, "fsdev with id %s needs mount_tag arguments",
4053 s
->fsconf
.fsdev_id
);
4057 s
->ctx
.export_flags
= fse
->export_flags
;
4058 s
->ctx
.fs_root
= g_strdup(fse
->path
);
4059 s
->ctx
.exops
.get_st_gen
= NULL
;
4060 len
= strlen(s
->fsconf
.tag
);
4061 if (len
> MAX_TAG_LEN
- 1) {
4062 error_setg(errp
, "mount tag '%s' (%d bytes) is longer than "
4063 "maximum (%d bytes)", s
->fsconf
.tag
, len
, MAX_TAG_LEN
- 1);
4067 s
->tag
= g_strdup(s
->fsconf
.tag
);
4072 s
->ctx
.fmode
= fse
->fmode
;
4073 s
->ctx
.dmode
= fse
->dmode
;
4076 qemu_co_rwlock_init(&s
->rename_lock
);
4078 if (s
->ops
->init(&s
->ctx
, errp
) < 0) {
4079 error_prepend(errp
, "cannot initialize fsdev '%s': ",
4080 s
->fsconf
.fsdev_id
);
4085 * Check details of export path, We need to use fs driver
4086 * call back to do that. Since we are in the init path, we don't
4087 * use co-routines here.
4089 if (s
->ops
->name_to_path(&s
->ctx
, NULL
, "/", &path
) < 0) {
4091 "error in converting name to path %s", strerror(errno
));
4094 if (s
->ops
->lstat(&s
->ctx
, &path
, &stat
)) {
4095 error_setg(errp
, "share path %s does not exist", fse
->path
);
4097 } else if (!S_ISDIR(stat
.st_mode
)) {
4098 error_setg(errp
, "share path %s is not a directory", fse
->path
);
4102 s
->dev_id
= stat
.st_dev
;
4104 /* init inode remapping : */
4105 /* hash table for variable length inode suffixes */
4106 qpd_table_init(&s
->qpd_table
);
4107 /* hash table for slow/full inode remapping (most users won't need it) */
4108 qpf_table_init(&s
->qpf_table
);
4109 /* hash table for quick inode remapping */
4110 qpp_table_init(&s
->qpp_table
);
4112 s
->qp_affix_next
= 1; /* reserve 0 to detect overflow */
4113 s
->qp_fullpath_next
= 1;
4115 s
->ctx
.fst
= &fse
->fst
;
4116 fsdev_throttle_init(s
->ctx
.fst
);
4121 v9fs_device_unrealize_common(s
);
4123 v9fs_path_free(&path
);
4127 void v9fs_device_unrealize_common(V9fsState
*s
)
4129 if (s
->ops
&& s
->ops
->cleanup
) {
4130 s
->ops
->cleanup(&s
->ctx
);
4133 fsdev_throttle_cleanup(s
->ctx
.fst
);
4136 qp_table_destroy(&s
->qpd_table
);
4137 qp_table_destroy(&s
->qpp_table
);
4138 qp_table_destroy(&s
->qpf_table
);
4139 g_free(s
->ctx
.fs_root
);
4142 typedef struct VirtfsCoResetData
{
4145 } VirtfsCoResetData
;
4147 static void coroutine_fn
virtfs_co_reset(void *opaque
)
4149 VirtfsCoResetData
*data
= opaque
;
4151 virtfs_reset(&data
->pdu
);
4155 void v9fs_reset(V9fsState
*s
)
4157 VirtfsCoResetData data
= { .pdu
= { .s
= s
}, .done
= false };
4160 while (!QLIST_EMPTY(&s
->active_list
)) {
4161 aio_poll(qemu_get_aio_context(), true);
4164 co
= qemu_coroutine_create(virtfs_co_reset
, &data
);
4165 qemu_coroutine_enter(co
);
4167 while (!data
.done
) {
4168 aio_poll(qemu_get_aio_context(), true);
4172 static void __attribute__((__constructor__
)) v9fs_set_fd_limit(void)
4175 if (getrlimit(RLIMIT_NOFILE
, &rlim
) < 0) {
4176 error_report("Failed to get the resource limit");
4179 open_fd_hw
= rlim
.rlim_cur
- MIN(400, rlim
.rlim_cur
/3);
4180 open_fd_rc
= rlim
.rlim_cur
/2;