4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
25 /* Portions Copyright 2007 Jeremy Teo */
26 /* Portions Copyright 2010 Robert Milkowski */
29 #include <sys/types.h>
30 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/sysmacros.h>
34 #include <sys/resource.h>
36 #include <sys/vfs_opreg.h>
40 #include <sys/taskq.h>
42 #include <sys/vmsystm.h>
43 #include <sys/atomic.h>
45 #include <sys/pathname.h>
46 #include <sys/cmn_err.h>
47 #include <sys/errno.h>
48 #include <sys/unistd.h>
49 #include <sys/zfs_dir.h>
50 #include <sys/zfs_acl.h>
51 #include <sys/zfs_ioctl.h>
52 #include <sys/fs/zfs.h>
54 #include <sys/dmu_objset.h>
60 #include <sys/dirent.h>
61 #include <sys/policy.h>
62 #include <sys/sunddi.h>
65 #include "fs/fs_subr.h"
66 #include <sys/zfs_fuid.h>
67 #include <sys/zfs_sa.h>
68 #include <sys/zfs_vnops.h>
70 #include <sys/zfs_rlock.h>
71 #include <sys/extdirent.h>
72 #include <sys/kidmap.h>
79 * Each vnode op performs some logical unit of work. To do this, the ZPL must
80 * properly lock its in-core state, create a DMU transaction, do the work,
81 * record this work in the intent log (ZIL), commit the DMU transaction,
82 * and wait for the intent log to commit if it is a synchronous operation.
83 * Moreover, the vnode ops must work in both normal and log replay context.
84 * The ordering of events is important to avoid deadlocks and references
85 * to freed memory. The example below illustrates the following Big Rules:
87 * (1) A check must be made in each zfs thread for a mounted file system.
88 * This is done avoiding races using ZFS_ENTER(zsb).
89 * A ZFS_EXIT(zsb) is needed before all returns. Any znodes
90 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
91 * can return EIO from the calling function.
93 * (2) iput() should always be the last thing except for zil_commit()
94 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
95 * First, if it's the last reference, the vnode/znode
96 * can be freed, so the zp may point to freed memory. Second, the last
97 * reference will call zfs_zinactive(), which may induce a lot of work --
98 * pushing cached pages (which acquires range locks) and syncing out
99 * cached atime changes. Third, zfs_zinactive() may require a new tx,
100 * which could deadlock the system if you were already holding one.
101 * If you must call iput() within a tx then use iput_ASYNC().
103 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
104 * as they can span dmu_tx_assign() calls.
106 * (4) Always pass TXG_NOWAIT as the second argument to dmu_tx_assign().
107 * This is critical because we don't want to block while holding locks.
108 * Note, in particular, that if a lock is sometimes acquired before
109 * the tx assigns, and sometimes after (e.g. z_lock), then failing to
110 * use a non-blocking assign can deadlock the system. The scenario:
112 * Thread A has grabbed a lock before calling dmu_tx_assign().
113 * Thread B is in an already-assigned tx, and blocks for this lock.
114 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
115 * forever, because the previous txg can't quiesce until B's tx commits.
117 * If dmu_tx_assign() returns ERESTART and zsb->z_assign is TXG_NOWAIT,
118 * then drop all locks, call dmu_tx_wait(), and try again.
120 * (5) If the operation succeeded, generate the intent log entry for it
121 * before dropping locks. This ensures that the ordering of events
122 * in the intent log matches the order in which they actually occurred.
123 * During ZIL replay the zfs_log_* functions will update the sequence
124 * number to indicate the zil transaction has replayed.
126 * (6) At the end of each vnode op, the DMU tx must always commit,
127 * regardless of whether there were any errors.
129 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
130 * to ensure that synchronous semantics are provided when necessary.
132 * In general, this is how things should be ordered in each vnode op:
134 * ZFS_ENTER(zsb); // exit if unmounted
136 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
137 * rw_enter(...); // grab any other locks you need
138 * tx = dmu_tx_create(...); // get DMU tx
139 * dmu_tx_hold_*(); // hold each object you might modify
140 * error = dmu_tx_assign(tx, TXG_NOWAIT); // try to assign
142 * rw_exit(...); // drop locks
143 * zfs_dirent_unlock(dl); // unlock directory entry
144 * iput(...); // release held vnodes
145 * if (error == ERESTART) {
150 * dmu_tx_abort(tx); // abort DMU tx
151 * ZFS_EXIT(zsb); // finished in zfs
152 * return (error); // really out of space
154 * error = do_real_work(); // do whatever this VOP does
156 * zfs_log_*(...); // on success, make ZIL entry
157 * dmu_tx_commit(tx); // commit DMU tx -- error or not
158 * rw_exit(...); // drop locks
159 * zfs_dirent_unlock(dl); // unlock directory entry
160 * iput(...); // release held vnodes
161 * zil_commit(zilog, foid); // synchronous when necessary
162 * ZFS_EXIT(zsb); // finished in zfs
163 * return (error); // done, report error
168 * When a file is memory mapped, we must keep the IO data synchronized
169 * between the DMU cache and the memory mapped pages. What this means:
171 * On Write: If we find a memory mapped page, we write to *both*
172 * the page and the dmu buffer.
175 update_pages(struct inode
*ip
, int64_t start
, int len
,
176 objset_t
*os
, uint64_t oid
)
178 struct address_space
*mp
= ip
->i_mapping
;
184 off
= start
& (PAGE_CACHE_SIZE
-1);
185 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
186 nbytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
188 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
190 if (mapping_writably_mapped(mp
))
191 flush_dcache_page(pp
);
194 (void) dmu_read(os
, oid
, start
+off
, nbytes
, pb
+off
,
198 if (mapping_writably_mapped(mp
))
199 flush_dcache_page(pp
);
201 mark_page_accessed(pp
);
205 page_cache_release(pp
);
214 * When a file is memory mapped, we must keep the IO data synchronized
215 * between the DMU cache and the memory mapped pages. What this means:
217 * On Read: We "read" preferentially from memory mapped pages,
218 * else we default from the dmu buffer.
220 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
221 * the file is memory mapped.
224 mappedread(struct inode
*ip
, int nbytes
, uio_t
*uio
)
226 struct address_space
*mp
= ip
->i_mapping
;
228 znode_t
*zp
= ITOZ(ip
);
229 objset_t
*os
= ITOZSB(ip
)->z_os
;
236 start
= uio
->uio_loffset
;
237 off
= start
& (PAGE_CACHE_SIZE
-1);
238 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
239 bytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
241 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
243 ASSERT(PageUptodate(pp
));
246 error
= uiomove(pb
+ off
, bytes
, UIO_READ
, uio
);
249 if (mapping_writably_mapped(mp
))
250 flush_dcache_page(pp
);
252 mark_page_accessed(pp
);
254 page_cache_release(pp
);
256 error
= dmu_read_uio(os
, zp
->z_id
, uio
, bytes
);
268 offset_t zfs_read_chunk_size
= 1024 * 1024; /* Tunable */
271 * Read bytes from specified file into supplied buffer.
273 * IN: ip - inode of file to be read from.
274 * uio - structure supplying read location, range info,
276 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
277 * O_DIRECT flag; used to bypass page cache.
278 * cr - credentials of caller.
280 * OUT: uio - updated offset and range, buffer filled.
282 * RETURN: 0 if success
283 * error code if failure
286 * inode - atime updated if byte count > 0
290 zfs_read(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
292 znode_t
*zp
= ITOZ(ip
);
293 zfs_sb_t
*zsb
= ITOZSB(ip
);
298 #ifdef HAVE_UIO_ZEROCOPY
300 #endif /* HAVE_UIO_ZEROCOPY */
306 if (zp
->z_pflags
& ZFS_AV_QUARANTINED
) {
312 * Validate file offset
314 if (uio
->uio_loffset
< (offset_t
)0) {
320 * Fasttrack empty reads
322 if (uio
->uio_resid
== 0) {
327 #ifdef HAVE_MANDLOCKS
329 * Check for mandatory locks
331 if (MANDMODE(zp
->z_mode
)) {
332 if (error
= chklock(ip
, FREAD
,
333 uio
->uio_loffset
, uio
->uio_resid
, uio
->uio_fmode
, ct
)) {
338 #endif /* HAVE_MANDLOCK */
341 * If we're in FRSYNC mode, sync out this znode before reading it.
343 if (ioflag
& FRSYNC
|| zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
344 zil_commit(zsb
->z_log
, zp
->z_id
);
347 * Lock the range against changes.
349 rl
= zfs_range_lock(zp
, uio
->uio_loffset
, uio
->uio_resid
, RL_READER
);
352 * If we are reading past end-of-file we can skip
353 * to the end; but we might still need to set atime.
355 if (uio
->uio_loffset
>= zp
->z_size
) {
360 ASSERT(uio
->uio_loffset
< zp
->z_size
);
361 n
= MIN(uio
->uio_resid
, zp
->z_size
- uio
->uio_loffset
);
363 #ifdef HAVE_UIO_ZEROCOPY
364 if ((uio
->uio_extflg
== UIO_XUIO
) &&
365 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
)) {
367 int blksz
= zp
->z_blksz
;
368 uint64_t offset
= uio
->uio_loffset
;
370 xuio
= (xuio_t
*)uio
;
372 nblk
= (P2ROUNDUP(offset
+ n
, blksz
) - P2ALIGN(offset
,
375 ASSERT(offset
+ n
<= blksz
);
378 (void) dmu_xuio_init(xuio
, nblk
);
380 if (vn_has_cached_data(ip
)) {
382 * For simplicity, we always allocate a full buffer
383 * even if we only expect to read a portion of a block.
385 while (--nblk
>= 0) {
386 (void) dmu_xuio_add(xuio
,
387 dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
392 #endif /* HAVE_UIO_ZEROCOPY */
395 nbytes
= MIN(n
, zfs_read_chunk_size
-
396 P2PHASE(uio
->uio_loffset
, zfs_read_chunk_size
));
398 if (zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
399 error
= mappedread(ip
, nbytes
, uio
);
401 error
= dmu_read_uio(os
, zp
->z_id
, uio
, nbytes
);
404 /* convert checksum errors into IO errors */
413 zfs_range_unlock(rl
);
415 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
416 zfs_inode_update(zp
);
420 EXPORT_SYMBOL(zfs_read
);
423 * Write the bytes to a file.
425 * IN: ip - inode of file to be written to.
426 * uio - structure supplying write location, range info,
428 * ioflag - FAPPEND flag set if in append mode.
429 * O_DIRECT flag; used to bypass page cache.
430 * cr - credentials of caller.
432 * OUT: uio - updated offset and range.
434 * RETURN: 0 if success
435 * error code if failure
438 * ip - ctime|mtime updated if byte count > 0
443 zfs_write(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
445 znode_t
*zp
= ITOZ(ip
);
446 rlim64_t limit
= uio
->uio_limit
;
447 ssize_t start_resid
= uio
->uio_resid
;
451 zfs_sb_t
*zsb
= ZTOZSB(zp
);
456 int max_blksz
= zsb
->z_max_blksz
;
459 iovec_t
*aiov
= NULL
;
462 iovec_t
*iovp
= uio
->uio_iov
;
465 sa_bulk_attr_t bulk
[4];
466 uint64_t mtime
[2], ctime
[2];
467 ASSERTV(int iovcnt
= uio
->uio_iovcnt
);
470 * Fasttrack empty write
476 if (limit
== RLIM64_INFINITY
|| limit
> MAXOFFSET_T
)
482 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
483 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
484 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
, &zp
->z_size
, 8);
485 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
489 * If immutable or not appending then return EPERM
491 if ((zp
->z_pflags
& (ZFS_IMMUTABLE
| ZFS_READONLY
)) ||
492 ((zp
->z_pflags
& ZFS_APPENDONLY
) && !(ioflag
& FAPPEND
) &&
493 (uio
->uio_loffset
< zp
->z_size
))) {
501 * Validate file offset
503 woff
= ioflag
& FAPPEND
? zp
->z_size
: uio
->uio_loffset
;
509 #ifdef HAVE_MANDLOCKS
511 * Check for mandatory locks before calling zfs_range_lock()
512 * in order to prevent a deadlock with locks set via fcntl().
514 if (MANDMODE((mode_t
)zp
->z_mode
) &&
515 (error
= chklock(ip
, FWRITE
, woff
, n
, uio
->uio_fmode
, ct
)) != 0) {
519 #endif /* HAVE_MANDLOCKS */
521 #ifdef HAVE_UIO_ZEROCOPY
523 * Pre-fault the pages to ensure slow (eg NFS) pages
525 * Skip this if uio contains loaned arc_buf.
527 if ((uio
->uio_extflg
== UIO_XUIO
) &&
528 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
))
529 xuio
= (xuio_t
*)uio
;
531 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
532 #endif /* HAVE_UIO_ZEROCOPY */
535 * If in append mode, set the io offset pointer to eof.
537 if (ioflag
& FAPPEND
) {
539 * Obtain an appending range lock to guarantee file append
540 * semantics. We reset the write offset once we have the lock.
542 rl
= zfs_range_lock(zp
, 0, n
, RL_APPEND
);
544 if (rl
->r_len
== UINT64_MAX
) {
546 * We overlocked the file because this write will cause
547 * the file block size to increase.
548 * Note that zp_size cannot change with this lock held.
552 uio
->uio_loffset
= woff
;
555 * Note that if the file block size will change as a result of
556 * this write, then this range lock will lock the entire file
557 * so that we can re-write the block safely.
559 rl
= zfs_range_lock(zp
, woff
, n
, RL_WRITER
);
563 zfs_range_unlock(rl
);
568 if ((woff
+ n
) > limit
|| woff
> (limit
- n
))
571 /* Will this write extend the file length? */
572 write_eof
= (woff
+ n
> zp
->z_size
);
574 end_size
= MAX(zp
->z_size
, woff
+ n
);
577 * Write the file in reasonable size chunks. Each chunk is written
578 * in a separate transaction; this keeps the intent log records small
579 * and allows us to do more fine-grained space accounting.
583 woff
= uio
->uio_loffset
;
585 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
586 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
588 dmu_return_arcbuf(abuf
);
593 if (xuio
&& abuf
== NULL
) {
594 ASSERT(i_iov
< iovcnt
);
596 abuf
= dmu_xuio_arcbuf(xuio
, i_iov
);
597 dmu_xuio_clear(xuio
, i_iov
);
598 ASSERT((aiov
->iov_base
== abuf
->b_data
) ||
599 ((char *)aiov
->iov_base
- (char *)abuf
->b_data
+
600 aiov
->iov_len
== arc_buf_size(abuf
)));
602 } else if (abuf
== NULL
&& n
>= max_blksz
&&
603 woff
>= zp
->z_size
&&
604 P2PHASE(woff
, max_blksz
) == 0 &&
605 zp
->z_blksz
== max_blksz
) {
607 * This write covers a full block. "Borrow" a buffer
608 * from the dmu so that we can fill it before we enter
609 * a transaction. This avoids the possibility of
610 * holding up the transaction if the data copy hangs
611 * up on a pagefault (e.g., from an NFS server mapping).
615 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
617 ASSERT(abuf
!= NULL
);
618 ASSERT(arc_buf_size(abuf
) == max_blksz
);
619 if ((error
= uiocopy(abuf
->b_data
, max_blksz
,
620 UIO_WRITE
, uio
, &cbytes
))) {
621 dmu_return_arcbuf(abuf
);
624 ASSERT(cbytes
== max_blksz
);
628 * Start a transaction.
630 tx
= dmu_tx_create(zsb
->z_os
);
631 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
632 dmu_tx_hold_write(tx
, zp
->z_id
, woff
, MIN(n
, max_blksz
));
633 zfs_sa_upgrade_txholds(tx
, zp
);
634 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
636 if (error
== ERESTART
) {
643 dmu_return_arcbuf(abuf
);
648 * If zfs_range_lock() over-locked we grow the blocksize
649 * and then reduce the lock range. This will only happen
650 * on the first iteration since zfs_range_reduce() will
651 * shrink down r_len to the appropriate size.
653 if (rl
->r_len
== UINT64_MAX
) {
656 if (zp
->z_blksz
> max_blksz
) {
657 ASSERT(!ISP2(zp
->z_blksz
));
658 new_blksz
= MIN(end_size
, SPA_MAXBLOCKSIZE
);
660 new_blksz
= MIN(end_size
, max_blksz
);
662 zfs_grow_blocksize(zp
, new_blksz
, tx
);
663 zfs_range_reduce(rl
, woff
, n
);
667 * XXX - should we really limit each write to z_max_blksz?
668 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
670 nbytes
= MIN(n
, max_blksz
- P2PHASE(woff
, max_blksz
));
673 tx_bytes
= uio
->uio_resid
;
674 error
= dmu_write_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
676 tx_bytes
-= uio
->uio_resid
;
679 ASSERT(xuio
== NULL
|| tx_bytes
== aiov
->iov_len
);
681 * If this is not a full block write, but we are
682 * extending the file past EOF and this data starts
683 * block-aligned, use assign_arcbuf(). Otherwise,
684 * write via dmu_write().
686 if (tx_bytes
< max_blksz
&& (!write_eof
||
687 aiov
->iov_base
!= abuf
->b_data
)) {
689 dmu_write(zsb
->z_os
, zp
->z_id
, woff
,
690 aiov
->iov_len
, aiov
->iov_base
, tx
);
691 dmu_return_arcbuf(abuf
);
692 xuio_stat_wbuf_copied();
694 ASSERT(xuio
|| tx_bytes
== max_blksz
);
695 dmu_assign_arcbuf(sa_get_db(zp
->z_sa_hdl
),
698 ASSERT(tx_bytes
<= uio
->uio_resid
);
699 uioskip(uio
, tx_bytes
);
702 if (tx_bytes
&& zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
703 update_pages(ip
, woff
, tx_bytes
, zsb
->z_os
, zp
->z_id
);
706 * If we made no progress, we're done. If we made even
707 * partial progress, update the znode and ZIL accordingly.
710 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
711 (void *)&zp
->z_size
, sizeof (uint64_t), tx
);
718 * Clear Set-UID/Set-GID bits on successful write if not
719 * privileged and at least one of the excute bits is set.
721 * It would be nice to to this after all writes have
722 * been done, but that would still expose the ISUID/ISGID
723 * to another app after the partial write is committed.
725 * Note: we don't call zfs_fuid_map_id() here because
726 * user 0 is not an ephemeral uid.
728 mutex_enter(&zp
->z_acl_lock
);
729 if ((zp
->z_mode
& (S_IXUSR
| (S_IXUSR
>> 3) |
730 (S_IXUSR
>> 6))) != 0 &&
731 (zp
->z_mode
& (S_ISUID
| S_ISGID
)) != 0 &&
732 secpolicy_vnode_setid_retain(cr
,
733 (zp
->z_mode
& S_ISUID
) != 0 && zp
->z_uid
== 0) != 0) {
735 zp
->z_mode
&= ~(S_ISUID
| S_ISGID
);
736 newmode
= zp
->z_mode
;
737 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_MODE(zsb
),
738 (void *)&newmode
, sizeof (uint64_t), tx
);
740 mutex_exit(&zp
->z_acl_lock
);
742 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
746 * Update the file size (zp_size) if it has changed;
747 * account for possible concurrent updates.
749 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
750 (void) atomic_cas_64(&zp
->z_size
, end_size
,
755 * If we are replaying and eof is non zero then force
756 * the file size to the specified eof. Note, there's no
757 * concurrency during replay.
759 if (zsb
->z_replay
&& zsb
->z_replay_eof
!= 0)
760 zp
->z_size
= zsb
->z_replay_eof
;
762 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
764 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
);
769 ASSERT(tx_bytes
== nbytes
);
773 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
776 zfs_range_unlock(rl
);
779 * If we're in replay mode, or we made no progress, return error.
780 * Otherwise, it's at least a partial write, so it's successful.
782 if (zsb
->z_replay
|| uio
->uio_resid
== start_resid
) {
787 if (ioflag
& (FSYNC
| FDSYNC
) ||
788 zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
789 zil_commit(zilog
, zp
->z_id
);
791 zfs_inode_update(zp
);
795 EXPORT_SYMBOL(zfs_write
);
798 iput_async(struct inode
*ip
, taskq_t
*taskq
)
800 ASSERT(atomic_read(&ip
->i_count
) > 0);
801 if (atomic_read(&ip
->i_count
) == 1)
802 taskq_dispatch(taskq
, (task_func_t
*)iput
, ip
, TQ_SLEEP
);
808 zfs_get_done(zgd_t
*zgd
, int error
)
810 znode_t
*zp
= zgd
->zgd_private
;
811 objset_t
*os
= ZTOZSB(zp
)->z_os
;
814 dmu_buf_rele(zgd
->zgd_db
, zgd
);
816 zfs_range_unlock(zgd
->zgd_rl
);
819 * Release the vnode asynchronously as we currently have the
820 * txg stopped from syncing.
822 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
824 if (error
== 0 && zgd
->zgd_bp
)
825 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
827 kmem_free(zgd
, sizeof (zgd_t
));
831 static int zil_fault_io
= 0;
835 * Get data to generate a TX_WRITE intent log record.
838 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
841 objset_t
*os
= zsb
->z_os
;
843 uint64_t object
= lr
->lr_foid
;
844 uint64_t offset
= lr
->lr_offset
;
845 uint64_t size
= lr
->lr_length
;
846 blkptr_t
*bp
= &lr
->lr_blkptr
;
855 * Nothing to do if the file has been removed
857 if (zfs_zget(zsb
, object
, &zp
) != 0)
859 if (zp
->z_unlinked
) {
861 * Release the vnode asynchronously as we currently have the
862 * txg stopped from syncing.
864 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
868 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_SLEEP
);
869 zgd
->zgd_zilog
= zsb
->z_log
;
870 zgd
->zgd_private
= zp
;
873 * Write records come in two flavors: immediate and indirect.
874 * For small writes it's cheaper to store the data with the
875 * log record (immediate); for large writes it's cheaper to
876 * sync the data and get a pointer to it (indirect) so that
877 * we don't have to write the data twice.
879 if (buf
!= NULL
) { /* immediate write */
880 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
, RL_READER
);
881 /* test for truncation needs to be done while range locked */
882 if (offset
>= zp
->z_size
) {
885 error
= dmu_read(os
, object
, offset
, size
, buf
,
886 DMU_READ_NO_PREFETCH
);
888 ASSERT(error
== 0 || error
== ENOENT
);
889 } else { /* indirect write */
891 * Have to lock the whole block to ensure when it's
892 * written out and it's checksum is being calculated
893 * that no one can change the data. We need to re-check
894 * blocksize after we get the lock in case it's changed!
899 blkoff
= ISP2(size
) ? P2PHASE(offset
, size
) : offset
;
901 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
,
903 if (zp
->z_blksz
== size
)
906 zfs_range_unlock(zgd
->zgd_rl
);
908 /* test for truncation needs to be done while range locked */
909 if (lr
->lr_offset
>= zp
->z_size
)
918 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
919 DMU_READ_NO_PREFETCH
);
925 ASSERT(db
->db_offset
== offset
);
926 ASSERT(db
->db_size
== size
);
928 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
930 ASSERT(error
|| lr
->lr_length
<= zp
->z_blksz
);
933 * On success, we need to wait for the write I/O
934 * initiated by dmu_sync() to complete before we can
935 * release this dbuf. We will finish everything up
936 * in the zfs_get_done() callback.
941 if (error
== EALREADY
) {
942 lr
->lr_common
.lrc_txtype
= TX_WRITE2
;
948 zfs_get_done(zgd
, error
);
955 zfs_access(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
957 znode_t
*zp
= ITOZ(ip
);
958 zfs_sb_t
*zsb
= ITOZSB(ip
);
964 if (flag
& V_ACE_MASK
)
965 error
= zfs_zaccess(zp
, mode
, flag
, B_FALSE
, cr
);
967 error
= zfs_zaccess_rwx(zp
, mode
, flag
, cr
);
972 EXPORT_SYMBOL(zfs_access
);
975 * Lookup an entry in a directory, or an extended attribute directory.
976 * If it exists, return a held inode reference for it.
978 * IN: dip - inode of directory to search.
979 * nm - name of entry to lookup.
980 * flags - LOOKUP_XATTR set if looking for an attribute.
981 * cr - credentials of caller.
982 * direntflags - directory lookup flags
983 * realpnp - returned pathname.
985 * OUT: ipp - inode of located entry, NULL if not found.
987 * RETURN: 0 if success
988 * error code if failure
995 zfs_lookup(struct inode
*dip
, char *nm
, struct inode
**ipp
, int flags
,
996 cred_t
*cr
, int *direntflags
, pathname_t
*realpnp
)
998 znode_t
*zdp
= ITOZ(dip
);
999 zfs_sb_t
*zsb
= ITOZSB(dip
);
1003 if (!(flags
& (LOOKUP_XATTR
| FIGNORECASE
))) {
1005 if (!S_ISDIR(dip
->i_mode
)) {
1007 } else if (zdp
->z_sa_hdl
== NULL
) {
1011 if (nm
[0] == 0 || (nm
[0] == '.' && nm
[1] == '\0')) {
1012 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1021 vnode_t
*tvp
= dnlc_lookup(dvp
, nm
);
1024 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1029 if (tvp
== DNLC_NO_VNODE
) {
1034 return (specvp_check(vpp
, cr
));
1037 #endif /* HAVE_DNLC */
1046 if (flags
& LOOKUP_XATTR
) {
1048 * If the xattr property is off, refuse the lookup request.
1050 if (!(zsb
->z_flags
& ZSB_XATTR_USER
)) {
1056 * We don't allow recursive attributes..
1057 * Maybe someday we will.
1059 if (zdp
->z_pflags
& ZFS_XATTR
) {
1064 if ((error
= zfs_get_xattrdir(zdp
, ipp
, cr
, flags
))) {
1070 * Do we have permission to get into attribute directory?
1073 if ((error
= zfs_zaccess(ITOZ(*ipp
), ACE_EXECUTE
, 0,
1083 if (!S_ISDIR(dip
->i_mode
)) {
1089 * Check accessibility of directory.
1092 if ((error
= zfs_zaccess(zdp
, ACE_EXECUTE
, 0, B_FALSE
, cr
))) {
1097 if (zsb
->z_utf8
&& u8_validate(nm
, strlen(nm
),
1098 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1103 error
= zfs_dirlook(zdp
, nm
, ipp
, flags
, direntflags
, realpnp
);
1104 if ((error
== 0) && (*ipp
))
1105 zfs_inode_update(ITOZ(*ipp
));
1110 EXPORT_SYMBOL(zfs_lookup
);
1113 * Attempt to create a new entry in a directory. If the entry
1114 * already exists, truncate the file if permissible, else return
1115 * an error. Return the ip of the created or trunc'd file.
1117 * IN: dip - inode of directory to put new file entry in.
1118 * name - name of new file entry.
1119 * vap - attributes of new file.
1120 * excl - flag indicating exclusive or non-exclusive mode.
1121 * mode - mode to open file with.
1122 * cr - credentials of caller.
1123 * flag - large file flag [UNUSED].
1124 * vsecp - ACL to be set
1126 * OUT: ipp - inode of created or trunc'd entry.
1128 * RETURN: 0 if success
1129 * error code if failure
1132 * dip - ctime|mtime updated if new entry created
1133 * ip - ctime|mtime always, atime if new
1138 zfs_create(struct inode
*dip
, char *name
, vattr_t
*vap
, int excl
,
1139 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1141 znode_t
*zp
, *dzp
= ITOZ(dip
);
1142 zfs_sb_t
*zsb
= ITOZSB(dip
);
1150 zfs_acl_ids_t acl_ids
;
1151 boolean_t fuid_dirtied
;
1152 boolean_t have_acl
= B_FALSE
;
1155 * If we have an ephemeral id, ACL, or XVATTR then
1156 * make sure file system is at proper version
1162 if (zsb
->z_use_fuids
== B_FALSE
&&
1163 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1171 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
1172 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1177 if (vap
->va_mask
& ATTR_XVATTR
) {
1178 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1179 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1187 if (*name
== '\0') {
1189 * Null component name refers to the directory itself.
1196 /* possible igrab(zp) */
1199 if (flag
& FIGNORECASE
)
1202 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1206 zfs_acl_ids_free(&acl_ids
);
1207 if (strcmp(name
, "..") == 0)
1218 * Create a new file object and update the directory
1221 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1223 zfs_acl_ids_free(&acl_ids
);
1228 * We only support the creation of regular files in
1229 * extended attribute directories.
1232 if ((dzp
->z_pflags
& ZFS_XATTR
) && !S_ISREG(vap
->va_mode
)) {
1234 zfs_acl_ids_free(&acl_ids
);
1239 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1240 cr
, vsecp
, &acl_ids
)) != 0)
1244 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1245 zfs_acl_ids_free(&acl_ids
);
1250 tx
= dmu_tx_create(os
);
1252 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1253 ZFS_SA_BASE_ATTR_SIZE
);
1255 fuid_dirtied
= zsb
->z_fuid_dirty
;
1257 zfs_fuid_txhold(zsb
, tx
);
1258 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
1259 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
1260 if (!zsb
->z_use_sa
&&
1261 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1262 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1263 0, acl_ids
.z_aclp
->z_acl_bytes
);
1265 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1267 zfs_dirent_unlock(dl
);
1268 if (error
== ERESTART
) {
1273 zfs_acl_ids_free(&acl_ids
);
1278 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1281 zfs_fuid_sync(zsb
, tx
);
1283 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1284 txtype
= zfs_log_create_txtype(Z_FILE
, vsecp
, vap
);
1285 if (flag
& FIGNORECASE
)
1287 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, name
,
1288 vsecp
, acl_ids
.z_fuidp
, vap
);
1289 zfs_acl_ids_free(&acl_ids
);
1292 int aflags
= (flag
& FAPPEND
) ? V_APPEND
: 0;
1295 zfs_acl_ids_free(&acl_ids
);
1299 * A directory entry already exists for this name.
1302 * Can't truncate an existing file if in exclusive mode.
1309 * Can't open a directory for writing.
1311 if (S_ISDIR(ZTOI(zp
)->i_mode
)) {
1316 * Verify requested access to file.
1318 if (mode
&& (error
= zfs_zaccess_rwx(zp
, mode
, aflags
, cr
))) {
1322 mutex_enter(&dzp
->z_lock
);
1324 mutex_exit(&dzp
->z_lock
);
1327 * Truncate regular files if requested.
1329 if (S_ISREG(ZTOI(zp
)->i_mode
) &&
1330 (vap
->va_mask
& ATTR_SIZE
) && (vap
->va_size
== 0)) {
1331 /* we can't hold any locks when calling zfs_freesp() */
1332 zfs_dirent_unlock(dl
);
1334 error
= zfs_freesp(zp
, 0, 0, mode
, TRUE
);
1340 zfs_dirent_unlock(dl
);
1346 zfs_inode_update(dzp
);
1347 zfs_inode_update(zp
);
1351 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1352 zil_commit(zilog
, 0);
1357 EXPORT_SYMBOL(zfs_create
);
1360 * Remove an entry from a directory.
1362 * IN: dip - inode of directory to remove entry from.
1363 * name - name of entry to remove.
1364 * cr - credentials of caller.
1366 * RETURN: 0 if success
1367 * error code if failure
1371 * ip - ctime (if nlink > 0)
1374 uint64_t null_xattr
= 0;
1378 zfs_remove(struct inode
*dip
, char *name
, cred_t
*cr
)
1380 znode_t
*zp
, *dzp
= ITOZ(dip
);
1383 zfs_sb_t
*zsb
= ITOZSB(dip
);
1386 uint64_t xattr_obj_unlinked
= 0;
1392 pathname_t
*realnmp
= NULL
;
1393 #ifdef HAVE_PN_UTILS
1395 #endif /* HAVE_PN_UTILS */
1403 #ifdef HAVE_PN_UTILS
1404 if (flags
& FIGNORECASE
) {
1409 #endif /* HAVE_PN_UTILS */
1415 * Attempt to lock directory; fail if entry doesn't exist.
1417 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1419 #ifdef HAVE_PN_UTILS
1422 #endif /* HAVE_PN_UTILS */
1429 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1434 * Need to use rmdir for removing directories.
1436 if (S_ISDIR(ip
->i_mode
)) {
1443 dnlc_remove(dvp
, realnmp
->pn_buf
);
1445 dnlc_remove(dvp
, name
);
1446 #endif /* HAVE_DNLC */
1449 * We never delete the znode and always place it in the unlinked
1450 * set. The dentry cache will always hold the last reference and
1451 * is responsible for safely freeing the znode.
1454 tx
= dmu_tx_create(zsb
->z_os
);
1455 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1456 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1457 zfs_sa_upgrade_txholds(tx
, zp
);
1458 zfs_sa_upgrade_txholds(tx
, dzp
);
1460 /* are there any extended attributes? */
1461 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1462 &xattr_obj
, sizeof (xattr_obj
));
1463 if (error
== 0 && xattr_obj
) {
1464 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
1465 ASSERT3U(error
, ==, 0);
1466 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1467 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1470 /* charge as an update -- would be nice not to charge at all */
1471 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1473 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1475 zfs_dirent_unlock(dl
);
1479 if (error
== ERESTART
) {
1484 #ifdef HAVE_PN_UTILS
1487 #endif /* HAVE_PN_UTILS */
1494 * Remove the directory entry.
1496 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1505 * Hold z_lock so that we can make sure that the ACL obj
1506 * hasn't changed. Could have been deleted due to
1509 mutex_enter(&zp
->z_lock
);
1510 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1511 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1512 mutex_exit(&zp
->z_lock
);
1513 zfs_unlinked_add(zp
, tx
);
1517 #ifdef HAVE_PN_UTILS
1518 if (flags
& FIGNORECASE
)
1520 #endif /* HAVE_PN_UTILS */
1521 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1525 #ifdef HAVE_PN_UTILS
1528 #endif /* HAVE_PN_UTILS */
1530 zfs_dirent_unlock(dl
);
1531 zfs_inode_update(dzp
);
1532 zfs_inode_update(zp
);
1534 zfs_inode_update(xzp
);
1540 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1541 zil_commit(zilog
, 0);
1546 EXPORT_SYMBOL(zfs_remove
);
1549 * Create a new directory and insert it into dip using the name
1550 * provided. Return a pointer to the inserted directory.
1552 * IN: dip - inode of directory to add subdir to.
1553 * dirname - name of new directory.
1554 * vap - attributes of new directory.
1555 * cr - credentials of caller.
1556 * vsecp - ACL to be set
1558 * OUT: ipp - inode of created directory.
1560 * RETURN: 0 if success
1561 * error code if failure
1564 * dip - ctime|mtime updated
1565 * ipp - ctime|mtime|atime updated
1569 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1570 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1572 znode_t
*zp
, *dzp
= ITOZ(dip
);
1573 zfs_sb_t
*zsb
= ITOZSB(dip
);
1581 gid_t gid
= crgetgid(cr
);
1582 zfs_acl_ids_t acl_ids
;
1583 boolean_t fuid_dirtied
;
1585 ASSERT(S_ISDIR(vap
->va_mode
));
1588 * If we have an ephemeral id, ACL, or XVATTR then
1589 * make sure file system is at proper version
1593 if (zsb
->z_use_fuids
== B_FALSE
&&
1594 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1601 if (dzp
->z_pflags
& ZFS_XATTR
) {
1606 if (zsb
->z_utf8
&& u8_validate(dirname
,
1607 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1611 if (flags
& FIGNORECASE
)
1614 if (vap
->va_mask
& ATTR_XVATTR
) {
1615 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1616 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1622 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1623 vsecp
, &acl_ids
)) != 0) {
1628 * First make sure the new directory doesn't exist.
1630 * Existence is checked first to make sure we don't return
1631 * EACCES instead of EEXIST which can cause some applications
1637 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1639 zfs_acl_ids_free(&acl_ids
);
1644 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1645 zfs_acl_ids_free(&acl_ids
);
1646 zfs_dirent_unlock(dl
);
1651 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1652 zfs_acl_ids_free(&acl_ids
);
1653 zfs_dirent_unlock(dl
);
1659 * Add a new entry to the directory.
1661 tx
= dmu_tx_create(zsb
->z_os
);
1662 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
1663 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
1664 fuid_dirtied
= zsb
->z_fuid_dirty
;
1666 zfs_fuid_txhold(zsb
, tx
);
1667 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1668 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
1669 acl_ids
.z_aclp
->z_acl_bytes
);
1672 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1673 ZFS_SA_BASE_ATTR_SIZE
);
1675 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1677 zfs_dirent_unlock(dl
);
1678 if (error
== ERESTART
) {
1683 zfs_acl_ids_free(&acl_ids
);
1692 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1695 zfs_fuid_sync(zsb
, tx
);
1698 * Now put new name in parent dir.
1700 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1704 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
1705 if (flags
& FIGNORECASE
)
1707 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
1708 acl_ids
.z_fuidp
, vap
);
1710 zfs_acl_ids_free(&acl_ids
);
1714 zfs_dirent_unlock(dl
);
1716 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1717 zil_commit(zilog
, 0);
1719 zfs_inode_update(dzp
);
1720 zfs_inode_update(zp
);
1724 EXPORT_SYMBOL(zfs_mkdir
);
1727 * Remove a directory subdir entry. If the current working
1728 * directory is the same as the subdir to be removed, the
1731 * IN: dip - inode of directory to remove from.
1732 * name - name of directory to be removed.
1733 * cwd - inode of current working directory.
1734 * cr - credentials of caller.
1735 * flags - case flags
1737 * RETURN: 0 if success
1738 * error code if failure
1741 * dip - ctime|mtime updated
1745 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
1748 znode_t
*dzp
= ITOZ(dip
);
1751 zfs_sb_t
*zsb
= ITOZSB(dip
);
1762 if (flags
& FIGNORECASE
)
1768 * Attempt to lock directory; fail if entry doesn't exist.
1770 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1778 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1782 if (!S_ISDIR(ip
->i_mode
)) {
1793 * Grab a lock on the directory to make sure that noone is
1794 * trying to add (or lookup) entries while we are removing it.
1796 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
1799 * Grab a lock on the parent pointer to make sure we play well
1800 * with the treewalk and directory rename code.
1802 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
1804 tx
= dmu_tx_create(zsb
->z_os
);
1805 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1806 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1807 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1808 zfs_sa_upgrade_txholds(tx
, zp
);
1809 zfs_sa_upgrade_txholds(tx
, dzp
);
1810 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1812 rw_exit(&zp
->z_parent_lock
);
1813 rw_exit(&zp
->z_name_lock
);
1814 zfs_dirent_unlock(dl
);
1816 if (error
== ERESTART
) {
1826 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
1829 uint64_t txtype
= TX_RMDIR
;
1830 if (flags
& FIGNORECASE
)
1832 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
1837 rw_exit(&zp
->z_parent_lock
);
1838 rw_exit(&zp
->z_name_lock
);
1840 zfs_dirent_unlock(dl
);
1844 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1845 zil_commit(zilog
, 0);
1847 zfs_inode_update(dzp
);
1848 zfs_inode_update(zp
);
1852 EXPORT_SYMBOL(zfs_rmdir
);
1855 * Read as many directory entries as will fit into the provided
1856 * dirent buffer from the given directory cursor position.
1858 * IN: ip - inode of directory to read.
1859 * dirent - buffer for directory entries.
1861 * OUT: dirent - filler buffer of directory entries.
1863 * RETURN: 0 if success
1864 * error code if failure
1867 * ip - atime updated
1869 * Note that the low 4 bits of the cookie returned by zap is always zero.
1870 * This allows us to use the low range for "special" directory entries:
1871 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
1872 * we use the offset 2 for the '.zfs' directory.
1876 zfs_readdir(struct inode
*ip
, void *dirent
, filldir_t filldir
,
1877 loff_t
*pos
, cred_t
*cr
)
1879 znode_t
*zp
= ITOZ(ip
);
1880 zfs_sb_t
*zsb
= ITOZSB(ip
);
1883 zap_attribute_t zap
;
1893 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
1894 &parent
, sizeof (parent
))) != 0)
1898 * Quit if directory has been removed (posix)
1905 prefetch
= zp
->z_zn_prefetch
;
1908 * Initialize the iterator cursor.
1912 * Start iteration from the beginning of the directory.
1914 zap_cursor_init(&zc
, os
, zp
->z_id
);
1917 * The offset is a serialized cursor.
1919 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, *pos
);
1923 * Transform to file-system independent format
1930 * Special case `.', `..', and `.zfs'.
1933 (void) strcpy(zap
.za_name
, ".");
1934 zap
.za_normalization_conflict
= 0;
1936 } else if (*pos
== 1) {
1937 (void) strcpy(zap
.za_name
, "..");
1938 zap
.za_normalization_conflict
= 0;
1940 } else if (*pos
== 2 && zfs_show_ctldir(zp
)) {
1941 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
1942 zap
.za_normalization_conflict
= 0;
1943 objnum
= ZFSCTL_INO_ROOT
;
1948 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
1949 if (error
== ENOENT
)
1955 if (zap
.za_integer_length
!= 8 ||
1956 zap
.za_num_integers
!= 1) {
1957 cmn_err(CE_WARN
, "zap_readdir: bad directory "
1958 "entry, obj = %lld, offset = %lld\n",
1959 (u_longlong_t
)zp
->z_id
,
1960 (u_longlong_t
)*pos
);
1965 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
1967 done
= filldir(dirent
, zap
.za_name
, strlen(zap
.za_name
),
1968 zap_cursor_serialize(&zc
), objnum
, 0);
1973 /* Prefetch znode */
1975 dmu_prefetch(os
, objnum
, 0, 0);
1979 zap_cursor_advance(&zc
);
1980 *pos
= zap_cursor_serialize(&zc
);
1985 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
1988 zap_cursor_fini(&zc
);
1989 if (error
== ENOENT
)
1992 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
1993 zfs_inode_update(zp
);
2000 EXPORT_SYMBOL(zfs_readdir
);
2002 ulong_t zfs_fsync_sync_cnt
= 4;
2005 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2007 znode_t
*zp
= ITOZ(ip
);
2008 zfs_sb_t
*zsb
= ITOZSB(ip
);
2010 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2012 if (zsb
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2015 zil_commit(zsb
->z_log
, zp
->z_id
);
2020 EXPORT_SYMBOL(zfs_fsync
);
2024 * Get the requested file attributes and place them in the provided
2027 * IN: ip - inode of file.
2028 * vap - va_mask identifies requested attributes.
2029 * If ATTR_XVATTR set, then optional attrs are requested
2030 * flags - ATTR_NOACLCHECK (CIFS server context)
2031 * cr - credentials of caller.
2033 * OUT: vap - attribute values.
2035 * RETURN: 0 (always succeeds)
2039 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2041 znode_t
*zp
= ITOZ(ip
);
2042 zfs_sb_t
*zsb
= ITOZSB(ip
);
2045 uint64_t mtime
[2], ctime
[2];
2046 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2047 xoptattr_t
*xoap
= NULL
;
2048 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2049 sa_bulk_attr_t bulk
[2];
2055 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2057 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
2058 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
2060 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2066 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2067 * Also, if we are the owner don't bother, since owner should
2068 * always be allowed to read basic attributes of file.
2070 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2071 (vap
->va_uid
!= crgetuid(cr
))) {
2072 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2080 * Return all attributes. It's cheaper to provide the answer
2081 * than to determine whether we were asked the question.
2084 mutex_enter(&zp
->z_lock
);
2085 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2086 vap
->va_mode
= zp
->z_mode
;
2088 vap
->va_nodeid
= zp
->z_id
;
2089 if ((zp
->z_id
== zsb
->z_root
) && zfs_show_ctldir(zp
))
2090 links
= zp
->z_links
+ 1;
2092 links
= zp
->z_links
;
2093 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2094 vap
->va_size
= i_size_read(ip
);
2095 vap
->va_rdev
= ip
->i_rdev
;
2096 vap
->va_seq
= ip
->i_generation
;
2099 * Add in any requested optional attributes and the create time.
2100 * Also set the corresponding bits in the returned attribute bitmap.
2102 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zsb
->z_use_fuids
) {
2103 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2105 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2106 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2109 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2110 xoap
->xoa_readonly
=
2111 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2112 XVA_SET_RTN(xvap
, XAT_READONLY
);
2115 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2117 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2118 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2121 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2123 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2124 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2127 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2128 xoap
->xoa_nounlink
=
2129 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2130 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2133 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2134 xoap
->xoa_immutable
=
2135 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2136 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2139 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2140 xoap
->xoa_appendonly
=
2141 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2142 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2145 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2147 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2148 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2151 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2153 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2154 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2157 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2158 xoap
->xoa_av_quarantined
=
2159 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2160 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2163 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2164 xoap
->xoa_av_modified
=
2165 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2166 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2169 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2170 S_ISREG(ip
->i_mode
)) {
2171 zfs_sa_get_scanstamp(zp
, xvap
);
2174 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2177 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zsb
),
2178 times
, sizeof (times
));
2179 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2180 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2183 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2184 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2185 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2187 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2188 xoap
->xoa_generation
= zp
->z_gen
;
2189 XVA_SET_RTN(xvap
, XAT_GEN
);
2192 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2194 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2195 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2198 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2200 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2201 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2205 ZFS_TIME_DECODE(&vap
->va_atime
, zp
->z_atime
);
2206 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2207 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2209 mutex_exit(&zp
->z_lock
);
2211 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2213 if (zp
->z_blksz
== 0) {
2215 * Block size hasn't been set; suggest maximal I/O transfers.
2217 vap
->va_blksize
= zsb
->z_max_blksz
;
2223 EXPORT_SYMBOL(zfs_getattr
);
2226 * Set the file attributes to the values contained in the
2229 * IN: ip - inode of file to be modified.
2230 * vap - new attribute values.
2231 * If ATTR_XVATTR set, then optional attrs are being set
2232 * flags - ATTR_UTIME set if non-default time values provided.
2233 * - ATTR_NOACLCHECK (CIFS context only).
2234 * cr - credentials of caller.
2236 * RETURN: 0 if success
2237 * error code if failure
2240 * ip - ctime updated, mtime updated if size changed.
2244 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2246 znode_t
*zp
= ITOZ(ip
);
2247 zfs_sb_t
*zsb
= ITOZSB(ip
);
2251 xvattr_t
*tmpxvattr
;
2252 uint_t mask
= vap
->va_mask
;
2256 uint64_t new_uid
, new_gid
;
2258 uint64_t mtime
[2], ctime
[2];
2260 int need_policy
= FALSE
;
2262 zfs_fuid_info_t
*fuidp
= NULL
;
2263 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2266 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2267 boolean_t fuid_dirtied
= B_FALSE
;
2268 sa_bulk_attr_t bulk
[7], xattr_bulk
[7];
2269 int count
= 0, xattr_count
= 0;
2280 * Make sure that if we have ephemeral uid/gid or xvattr specified
2281 * that file system is at proper version level
2284 if (zsb
->z_use_fuids
== B_FALSE
&&
2285 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2286 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2287 (mask
& ATTR_XVATTR
))) {
2292 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2297 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2303 * If this is an xvattr_t, then get a pointer to the structure of
2304 * optional attributes. If this is NULL, then we have a vattr_t.
2306 xoap
= xva_getxoptattr(xvap
);
2308 tmpxvattr
= kmem_alloc(sizeof(xvattr_t
), KM_SLEEP
);
2309 xva_init(tmpxvattr
);
2312 * Immutable files can only alter immutable bit and atime
2314 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2315 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2316 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2321 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2327 * Verify timestamps doesn't overflow 32 bits.
2328 * ZFS can handle large timestamps, but 32bit syscalls can't
2329 * handle times greater than 2039. This check should be removed
2330 * once large timestamps are fully supported.
2332 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2333 if (((mask
& ATTR_ATIME
) && TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2334 ((mask
& ATTR_MTIME
) && TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2344 /* Can this be moved to before the top label? */
2345 if (zsb
->z_vfs
->mnt_flags
& MNT_READONLY
) {
2351 * First validate permissions
2354 if (mask
& ATTR_SIZE
) {
2355 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2360 * XXX - Note, we are not providing any open
2361 * mode flags here (like FNDELAY), so we may
2362 * block if there are locks present... this
2363 * should be addressed in openat().
2365 /* XXX - would it be OK to generate a log record here? */
2366 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2370 /* Careful negative Linux return code here */
2371 err
= -vmtruncate(ip
, vap
->va_size
);
2376 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2377 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2378 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2379 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2380 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2381 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2382 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2383 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2384 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2388 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2389 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2394 * NOTE: even if a new mode is being set,
2395 * we may clear S_ISUID/S_ISGID bits.
2398 if (!(mask
& ATTR_MODE
))
2399 vap
->va_mode
= zp
->z_mode
;
2402 * Take ownership or chgrp to group we are a member of
2405 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2406 take_group
= (mask
& ATTR_GID
) &&
2407 zfs_groupmember(zsb
, vap
->va_gid
, cr
);
2410 * If both ATTR_UID and ATTR_GID are set then take_owner and
2411 * take_group must both be set in order to allow taking
2414 * Otherwise, send the check through secpolicy_vnode_setattr()
2418 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2419 take_owner
&& take_group
) ||
2420 ((idmask
== ATTR_UID
) && take_owner
) ||
2421 ((idmask
== ATTR_GID
) && take_group
)) {
2422 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2423 skipaclchk
, cr
) == 0) {
2425 * Remove setuid/setgid for non-privileged users
2427 (void) secpolicy_setid_clear(vap
, cr
);
2428 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2437 mutex_enter(&zp
->z_lock
);
2438 oldva
.va_mode
= zp
->z_mode
;
2439 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2440 if (mask
& ATTR_XVATTR
) {
2442 * Update xvattr mask to include only those attributes
2443 * that are actually changing.
2445 * the bits will be restored prior to actually setting
2446 * the attributes so the caller thinks they were set.
2448 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2449 if (xoap
->xoa_appendonly
!=
2450 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2453 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2454 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2458 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2459 if (xoap
->xoa_nounlink
!=
2460 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2463 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2464 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2468 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2469 if (xoap
->xoa_immutable
!=
2470 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2473 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2474 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2478 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2479 if (xoap
->xoa_nodump
!=
2480 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2483 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2484 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2488 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2489 if (xoap
->xoa_av_modified
!=
2490 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2493 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2494 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2498 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2499 if ((!S_ISREG(ip
->i_mode
) &&
2500 xoap
->xoa_av_quarantined
) ||
2501 xoap
->xoa_av_quarantined
!=
2502 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2505 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2506 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2510 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2511 mutex_exit(&zp
->z_lock
);
2516 if (need_policy
== FALSE
&&
2517 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2518 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2523 mutex_exit(&zp
->z_lock
);
2525 if (mask
& ATTR_MODE
) {
2526 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2527 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2532 trim_mask
|= ATTR_MODE
;
2540 * If trim_mask is set then take ownership
2541 * has been granted or write_acl is present and user
2542 * has the ability to modify mode. In that case remove
2543 * UID|GID and or MODE from mask so that
2544 * secpolicy_vnode_setattr() doesn't revoke it.
2548 saved_mask
= vap
->va_mask
;
2549 vap
->va_mask
&= ~trim_mask
;
2551 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2552 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2557 vap
->va_mask
|= saved_mask
;
2561 * secpolicy_vnode_setattr, or take ownership may have
2564 mask
= vap
->va_mask
;
2566 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2567 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
2568 &xattr_obj
, sizeof (xattr_obj
));
2570 if (err
== 0 && xattr_obj
) {
2571 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
2575 if (mask
& ATTR_UID
) {
2576 new_uid
= zfs_fuid_create(zsb
,
2577 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
2578 if (new_uid
!= zp
->z_uid
&&
2579 zfs_fuid_overquota(zsb
, B_FALSE
, new_uid
)) {
2587 if (mask
& ATTR_GID
) {
2588 new_gid
= zfs_fuid_create(zsb
, (uint64_t)vap
->va_gid
,
2589 cr
, ZFS_GROUP
, &fuidp
);
2590 if (new_gid
!= zp
->z_gid
&&
2591 zfs_fuid_overquota(zsb
, B_TRUE
, new_gid
)) {
2599 tx
= dmu_tx_create(zsb
->z_os
);
2601 if (mask
& ATTR_MODE
) {
2602 uint64_t pmode
= zp
->z_mode
;
2604 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
2606 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
2608 mutex_enter(&zp
->z_lock
);
2609 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
2611 * Are we upgrading ACL from old V0 format
2614 if (zsb
->z_version
>= ZPL_VERSION_FUID
&&
2615 zfs_znode_acl_version(zp
) ==
2616 ZFS_ACL_VERSION_INITIAL
) {
2617 dmu_tx_hold_free(tx
, acl_obj
, 0,
2619 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2620 0, aclp
->z_acl_bytes
);
2622 dmu_tx_hold_write(tx
, acl_obj
, 0,
2625 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
2626 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2627 0, aclp
->z_acl_bytes
);
2629 mutex_exit(&zp
->z_lock
);
2630 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2632 if ((mask
& ATTR_XVATTR
) &&
2633 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2634 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2636 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2640 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
2643 fuid_dirtied
= zsb
->z_fuid_dirty
;
2645 zfs_fuid_txhold(zsb
, tx
);
2647 zfs_sa_upgrade_txholds(tx
, zp
);
2649 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
2651 if (err
== ERESTART
)
2658 * Set each attribute requested.
2659 * We group settings according to the locks they need to acquire.
2661 * Note: you cannot set ctime directly, although it will be
2662 * updated as a side-effect of calling this function.
2666 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2667 mutex_enter(&zp
->z_acl_lock
);
2668 mutex_enter(&zp
->z_lock
);
2670 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
2671 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
2674 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2675 mutex_enter(&attrzp
->z_acl_lock
);
2676 mutex_enter(&attrzp
->z_lock
);
2677 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2678 SA_ZPL_FLAGS(zsb
), NULL
, &attrzp
->z_pflags
,
2679 sizeof (attrzp
->z_pflags
));
2682 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2684 if (mask
& ATTR_UID
) {
2685 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zsb
), NULL
,
2686 &new_uid
, sizeof (new_uid
));
2687 zp
->z_uid
= new_uid
;
2689 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2690 SA_ZPL_UID(zsb
), NULL
, &new_uid
,
2692 attrzp
->z_uid
= new_uid
;
2696 if (mask
& ATTR_GID
) {
2697 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zsb
),
2698 NULL
, &new_gid
, sizeof (new_gid
));
2699 zp
->z_gid
= new_gid
;
2701 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2702 SA_ZPL_GID(zsb
), NULL
, &new_gid
,
2704 attrzp
->z_gid
= new_gid
;
2707 if (!(mask
& ATTR_MODE
)) {
2708 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
),
2709 NULL
, &new_mode
, sizeof (new_mode
));
2710 new_mode
= zp
->z_mode
;
2712 err
= zfs_acl_chown_setattr(zp
);
2715 err
= zfs_acl_chown_setattr(attrzp
);
2720 if (mask
& ATTR_MODE
) {
2721 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
), NULL
,
2722 &new_mode
, sizeof (new_mode
));
2723 zp
->z_mode
= new_mode
;
2724 ASSERT3P(aclp
, !=, NULL
);
2725 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
2726 ASSERT3U(err
, ==, 0);
2727 if (zp
->z_acl_cached
)
2728 zfs_acl_free(zp
->z_acl_cached
);
2729 zp
->z_acl_cached
= aclp
;
2734 if (mask
& ATTR_ATIME
) {
2735 ZFS_TIME_ENCODE(&vap
->va_atime
, zp
->z_atime
);
2736 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
,
2737 &zp
->z_atime
, sizeof (zp
->z_atime
));
2740 if (mask
& ATTR_MTIME
) {
2741 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
2742 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
2743 mtime
, sizeof (mtime
));
2746 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
2747 if (mask
& ATTR_SIZE
&& !(mask
& ATTR_MTIME
)) {
2748 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
2749 NULL
, mtime
, sizeof (mtime
));
2750 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2751 &ctime
, sizeof (ctime
));
2752 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
2754 } else if (mask
!= 0) {
2755 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2756 &ctime
, sizeof (ctime
));
2757 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
2760 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2761 SA_ZPL_CTIME(zsb
), NULL
,
2762 &ctime
, sizeof (ctime
));
2763 zfs_tstamp_update_setup(attrzp
, STATE_CHANGED
,
2764 mtime
, ctime
, B_TRUE
);
2768 * Do this after setting timestamps to prevent timestamp
2769 * update from toggling bit
2772 if (xoap
&& (mask
& ATTR_XVATTR
)) {
2775 * restore trimmed off masks
2776 * so that return masks can be set for caller.
2779 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
2780 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
2782 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
2783 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
2785 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
2786 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
2788 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
2789 XVA_SET_REQ(xvap
, XAT_NODUMP
);
2791 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
2792 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
2794 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
2795 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
2798 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2799 ASSERT(S_ISREG(ip
->i_mode
));
2801 zfs_xvattr_set(zp
, xvap
, tx
);
2805 zfs_fuid_sync(zsb
, tx
);
2808 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
2810 mutex_exit(&zp
->z_lock
);
2811 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2812 mutex_exit(&zp
->z_acl_lock
);
2815 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2816 mutex_exit(&attrzp
->z_acl_lock
);
2817 mutex_exit(&attrzp
->z_lock
);
2820 if (err
== 0 && attrzp
) {
2821 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
2832 zfs_fuid_info_free(fuidp
);
2838 if (err
== ERESTART
)
2841 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
2843 zfs_inode_update(zp
);
2847 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2848 zil_commit(zilog
, 0);
2851 kmem_free(tmpxvattr
, sizeof(xvattr_t
));
2855 EXPORT_SYMBOL(zfs_setattr
);
2857 typedef struct zfs_zlock
{
2858 krwlock_t
*zl_rwlock
; /* lock we acquired */
2859 znode_t
*zl_znode
; /* znode we held */
2860 struct zfs_zlock
*zl_next
; /* next in list */
2864 * Drop locks and release vnodes that were held by zfs_rename_lock().
2867 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
2871 while ((zl
= *zlpp
) != NULL
) {
2872 if (zl
->zl_znode
!= NULL
)
2873 iput(ZTOI(zl
->zl_znode
));
2874 rw_exit(zl
->zl_rwlock
);
2875 *zlpp
= zl
->zl_next
;
2876 kmem_free(zl
, sizeof (*zl
));
2881 * Search back through the directory tree, using the ".." entries.
2882 * Lock each directory in the chain to prevent concurrent renames.
2883 * Fail any attempt to move a directory into one of its own descendants.
2884 * XXX - z_parent_lock can overlap with map or grow locks
2887 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
2891 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
2892 uint64_t oidp
= zp
->z_id
;
2893 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
2894 krw_t rw
= RW_WRITER
;
2897 * First pass write-locks szp and compares to zp->z_id.
2898 * Later passes read-lock zp and compare to zp->z_parent.
2901 if (!rw_tryenter(rwlp
, rw
)) {
2903 * Another thread is renaming in this path.
2904 * Note that if we are a WRITER, we don't have any
2905 * parent_locks held yet.
2907 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
2909 * Drop our locks and restart
2911 zfs_rename_unlock(&zl
);
2915 rwlp
= &szp
->z_parent_lock
;
2920 * Wait for other thread to drop its locks
2926 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
2927 zl
->zl_rwlock
= rwlp
;
2928 zl
->zl_znode
= NULL
;
2929 zl
->zl_next
= *zlpp
;
2932 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
2935 if (oidp
== rootid
) /* We've hit the top */
2938 if (rw
== RW_READER
) { /* i.e. not the first pass */
2939 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
2944 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
2945 &oidp
, sizeof (oidp
));
2946 rwlp
= &zp
->z_parent_lock
;
2949 } while (zp
->z_id
!= sdzp
->z_id
);
2955 * Move an entry from the provided source directory to the target
2956 * directory. Change the entry name as indicated.
2958 * IN: sdip - Source directory containing the "old entry".
2959 * snm - Old entry name.
2960 * tdip - Target directory to contain the "new entry".
2961 * tnm - New entry name.
2962 * cr - credentials of caller.
2963 * flags - case flags
2965 * RETURN: 0 if success
2966 * error code if failure
2969 * sdip,tdip - ctime|mtime updated
2973 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
2974 cred_t
*cr
, int flags
)
2976 znode_t
*tdzp
, *szp
, *tzp
;
2977 znode_t
*sdzp
= ITOZ(sdip
);
2978 zfs_sb_t
*zsb
= ITOZSB(sdip
);
2980 zfs_dirlock_t
*sdl
, *tdl
;
2983 int cmp
, serr
, terr
;
2988 ZFS_VERIFY_ZP(sdzp
);
2991 if (tdip
->i_sb
!= sdip
->i_sb
) {
2997 ZFS_VERIFY_ZP(tdzp
);
2998 if (zsb
->z_utf8
&& u8_validate(tnm
,
2999 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3004 if (flags
& FIGNORECASE
)
3013 * This is to prevent the creation of links into attribute space
3014 * by renaming a linked file into/outof an attribute directory.
3015 * See the comment in zfs_link() for why this is considered bad.
3017 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3023 * Lock source and target directory entries. To prevent deadlock,
3024 * a lock ordering must be defined. We lock the directory with
3025 * the smallest object id first, or if it's a tie, the one with
3026 * the lexically first name.
3028 if (sdzp
->z_id
< tdzp
->z_id
) {
3030 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3034 * First compare the two name arguments without
3035 * considering any case folding.
3037 int nofold
= (zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3039 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3040 ASSERT(error
== 0 || !zsb
->z_utf8
);
3043 * POSIX: "If the old argument and the new argument
3044 * both refer to links to the same existing file,
3045 * the rename() function shall return successfully
3046 * and perform no other action."
3052 * If the file system is case-folding, then we may
3053 * have some more checking to do. A case-folding file
3054 * system is either supporting mixed case sensitivity
3055 * access or is completely case-insensitive. Note
3056 * that the file system is always case preserving.
3058 * In mixed sensitivity mode case sensitive behavior
3059 * is the default. FIGNORECASE must be used to
3060 * explicitly request case insensitive behavior.
3062 * If the source and target names provided differ only
3063 * by case (e.g., a request to rename 'tim' to 'Tim'),
3064 * we will treat this as a special case in the
3065 * case-insensitive mode: as long as the source name
3066 * is an exact match, we will allow this to proceed as
3067 * a name-change request.
3069 if ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
||
3070 (zsb
->z_case
== ZFS_CASE_MIXED
&&
3071 flags
& FIGNORECASE
)) &&
3072 u8_strcmp(snm
, tnm
, 0, zsb
->z_norm
, U8_UNICODE_LATEST
,
3075 * case preserving rename request, require exact
3084 * If the source and destination directories are the same, we should
3085 * grab the z_name_lock of that directory only once.
3089 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3093 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3094 ZEXISTS
| zflg
, NULL
, NULL
);
3095 terr
= zfs_dirent_lock(&tdl
,
3096 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3098 terr
= zfs_dirent_lock(&tdl
,
3099 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3100 serr
= zfs_dirent_lock(&sdl
,
3101 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3107 * Source entry invalid or not there.
3110 zfs_dirent_unlock(tdl
);
3116 rw_exit(&sdzp
->z_name_lock
);
3118 if (strcmp(snm
, "..") == 0)
3124 zfs_dirent_unlock(sdl
);
3128 rw_exit(&sdzp
->z_name_lock
);
3130 if (strcmp(tnm
, "..") == 0)
3137 * Must have write access at the source to remove the old entry
3138 * and write access at the target to create the new entry.
3139 * Note that if target and source are the same, this can be
3140 * done in a single check.
3143 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3146 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3148 * Check to make sure rename is valid.
3149 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3151 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3156 * Does target exist?
3160 * Source and target must be the same type.
3162 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3163 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3168 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3174 * POSIX dictates that when the source and target
3175 * entries refer to the same file object, rename
3176 * must do nothing and exit without error.
3178 if (szp
->z_id
== tzp
->z_id
) {
3184 tx
= dmu_tx_create(zsb
->z_os
);
3185 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3186 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3187 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3188 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3190 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3191 zfs_sa_upgrade_txholds(tx
, tdzp
);
3194 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3195 zfs_sa_upgrade_txholds(tx
, tzp
);
3198 zfs_sa_upgrade_txholds(tx
, szp
);
3199 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
3200 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3203 zfs_rename_unlock(&zl
);
3204 zfs_dirent_unlock(sdl
);
3205 zfs_dirent_unlock(tdl
);
3208 rw_exit(&sdzp
->z_name_lock
);
3213 if (error
== ERESTART
) {
3223 if (tzp
) /* Attempt to remove the existing target */
3224 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3227 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3229 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3231 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zsb
),
3232 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3233 ASSERT3U(error
, ==, 0);
3235 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3237 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3238 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3239 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3242 * At this point, we have successfully created
3243 * the target name, but have failed to remove
3244 * the source name. Since the create was done
3245 * with the ZRENAMING flag, there are
3246 * complications; for one, the link count is
3247 * wrong. The easiest way to deal with this
3248 * is to remove the newly created target, and
3249 * return the original error. This must
3250 * succeed; fortunately, it is very unlikely to
3251 * fail, since we just created it.
3253 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3254 ZRENAMING
, NULL
), ==, 0);
3262 zfs_rename_unlock(&zl
);
3264 zfs_dirent_unlock(sdl
);
3265 zfs_dirent_unlock(tdl
);
3267 zfs_inode_update(sdzp
);
3269 rw_exit(&sdzp
->z_name_lock
);
3272 zfs_inode_update(tdzp
);
3274 zfs_inode_update(szp
);
3277 zfs_inode_update(tzp
);
3281 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3282 zil_commit(zilog
, 0);
3287 EXPORT_SYMBOL(zfs_rename
);
3290 * Insert the indicated symbolic reference entry into the directory.
3292 * IN: dip - Directory to contain new symbolic link.
3293 * link - Name for new symlink entry.
3294 * vap - Attributes of new entry.
3295 * target - Target path of new symlink.
3297 * cr - credentials of caller.
3298 * flags - case flags
3300 * RETURN: 0 if success
3301 * error code if failure
3304 * dip - ctime|mtime updated
3308 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3309 struct inode
**ipp
, cred_t
*cr
, int flags
)
3311 znode_t
*zp
, *dzp
= ITOZ(dip
);
3314 zfs_sb_t
*zsb
= ITOZSB(dip
);
3316 uint64_t len
= strlen(link
);
3319 zfs_acl_ids_t acl_ids
;
3320 boolean_t fuid_dirtied
;
3321 uint64_t txtype
= TX_SYMLINK
;
3323 ASSERT(S_ISLNK(vap
->va_mode
));
3329 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
3330 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3334 if (flags
& FIGNORECASE
)
3337 if (len
> MAXPATHLEN
) {
3339 return (ENAMETOOLONG
);
3342 if ((error
= zfs_acl_ids_create(dzp
, 0,
3343 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3351 * Attempt to lock directory; fail if entry already exists.
3353 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3355 zfs_acl_ids_free(&acl_ids
);
3360 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3361 zfs_acl_ids_free(&acl_ids
);
3362 zfs_dirent_unlock(dl
);
3367 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
3368 zfs_acl_ids_free(&acl_ids
);
3369 zfs_dirent_unlock(dl
);
3373 tx
= dmu_tx_create(zsb
->z_os
);
3374 fuid_dirtied
= zsb
->z_fuid_dirty
;
3375 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3376 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3377 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3378 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3379 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3380 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3381 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3382 acl_ids
.z_aclp
->z_acl_bytes
);
3385 zfs_fuid_txhold(zsb
, tx
);
3386 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3388 zfs_dirent_unlock(dl
);
3389 if (error
== ERESTART
) {
3394 zfs_acl_ids_free(&acl_ids
);
3401 * Create a new object for the symlink.
3402 * for version 4 ZPL datsets the symlink will be an SA attribute
3404 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3407 zfs_fuid_sync(zsb
, tx
);
3409 mutex_enter(&zp
->z_lock
);
3411 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zsb
),
3414 zfs_sa_symlink(zp
, link
, len
, tx
);
3415 mutex_exit(&zp
->z_lock
);
3418 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
3419 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3421 * Insert the new object into the directory.
3423 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3425 if (flags
& FIGNORECASE
)
3427 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3429 zfs_inode_update(dzp
);
3430 zfs_inode_update(zp
);
3432 zfs_acl_ids_free(&acl_ids
);
3436 zfs_dirent_unlock(dl
);
3440 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3441 zil_commit(zilog
, 0);
3446 EXPORT_SYMBOL(zfs_symlink
);
3449 * Return, in the buffer contained in the provided uio structure,
3450 * the symbolic path referred to by ip.
3452 * IN: ip - inode of symbolic link
3453 * uio - structure to contain the link path.
3454 * cr - credentials of caller.
3456 * RETURN: 0 if success
3457 * error code if failure
3460 * ip - atime updated
3464 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3466 znode_t
*zp
= ITOZ(ip
);
3467 zfs_sb_t
*zsb
= ITOZSB(ip
);
3473 mutex_enter(&zp
->z_lock
);
3475 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3476 SA_ZPL_SYMLINK(zsb
), uio
);
3478 error
= zfs_sa_readlink(zp
, uio
);
3479 mutex_exit(&zp
->z_lock
);
3481 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
3482 zfs_inode_update(zp
);
3486 EXPORT_SYMBOL(zfs_readlink
);
3489 * Insert a new entry into directory tdip referencing sip.
3491 * IN: tdip - Directory to contain new entry.
3492 * sip - inode of new entry.
3493 * name - name of new entry.
3494 * cr - credentials of caller.
3496 * RETURN: 0 if success
3497 * error code if failure
3500 * tdip - ctime|mtime updated
3501 * sip - ctime updated
3505 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
)
3507 znode_t
*dzp
= ITOZ(tdip
);
3509 zfs_sb_t
*zsb
= ITOZSB(tdip
);
3518 ASSERT(S_ISDIR(tdip
->i_mode
));
3525 * POSIX dictates that we return EPERM here.
3526 * Better choices include ENOTSUP or EISDIR.
3528 if (S_ISDIR(sip
->i_mode
)) {
3533 if (sip
->i_sb
!= tdip
->i_sb
) {
3541 /* Prevent links to .zfs/shares files */
3543 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
3544 &parent
, sizeof (uint64_t))) != 0) {
3548 if (parent
== zsb
->z_shares_dir
) {
3553 if (zsb
->z_utf8
&& u8_validate(name
,
3554 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3558 #ifdef HAVE_PN_UTILS
3559 if (flags
& FIGNORECASE
)
3561 #endif /* HAVE_PN_UTILS */
3564 * We do not support links between attributes and non-attributes
3565 * because of the potential security risk of creating links
3566 * into "normal" file space in order to circumvent restrictions
3567 * imposed in attribute space.
3569 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
3574 owner
= zfs_fuid_map_id(zsb
, szp
->z_uid
, cr
, ZFS_OWNER
);
3575 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
3580 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3587 * Attempt to lock directory; fail if entry already exists.
3589 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
3595 tx
= dmu_tx_create(zsb
->z_os
);
3596 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3597 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3598 zfs_sa_upgrade_txholds(tx
, szp
);
3599 zfs_sa_upgrade_txholds(tx
, dzp
);
3600 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3602 zfs_dirent_unlock(dl
);
3603 if (error
== ERESTART
) {
3613 error
= zfs_link_create(dl
, szp
, tx
, 0);
3616 uint64_t txtype
= TX_LINK
;
3617 #ifdef HAVE_PN_UTILS
3618 if (flags
& FIGNORECASE
)
3620 #endif /* HAVE_PN_UTILS */
3621 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
3626 zfs_dirent_unlock(dl
);
3628 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3629 zil_commit(zilog
, 0);
3631 zfs_inode_update(dzp
);
3632 zfs_inode_update(szp
);
3636 EXPORT_SYMBOL(zfs_link
);
3640 * zfs_null_putapage() is used when the file system has been force
3641 * unmounted. It just drops the pages.
3645 zfs_null_putapage(vnode_t
*vp
, page_t
*pp
, u_offset_t
*offp
,
3646 size_t *lenp
, int flags
, cred_t
*cr
)
3648 pvn_write_done(pp
, B_INVAL
|B_FORCE
|B_ERROR
);
3653 * Push a page out to disk, klustering if possible.
3655 * IN: vp - file to push page to.
3656 * pp - page to push.
3657 * flags - additional flags.
3658 * cr - credentials of caller.
3660 * OUT: offp - start of range pushed.
3661 * lenp - len of range pushed.
3663 * RETURN: 0 if success
3664 * error code if failure
3666 * NOTE: callers must have locked the page to be pushed. On
3667 * exit, the page (and all other pages in the kluster) must be
3672 zfs_putapage(vnode_t
*vp
, page_t
*pp
, u_offset_t
*offp
,
3673 size_t *lenp
, int flags
, cred_t
*cr
)
3675 znode_t
*zp
= VTOZ(vp
);
3676 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
3678 u_offset_t off
, koff
;
3685 * If our blocksize is bigger than the page size, try to kluster
3686 * multiple pages so that we write a full block (thus avoiding
3687 * a read-modify-write).
3689 if (off
< zp
->z_size
&& zp
->z_blksz
> PAGESIZE
) {
3690 klen
= P2ROUNDUP((ulong_t
)zp
->z_blksz
, PAGESIZE
);
3691 koff
= ISP2(klen
) ? P2ALIGN(off
, (u_offset_t
)klen
) : 0;
3692 ASSERT(koff
<= zp
->z_size
);
3693 if (koff
+ klen
> zp
->z_size
)
3694 klen
= P2ROUNDUP(zp
->z_size
- koff
, (uint64_t)PAGESIZE
);
3695 pp
= pvn_write_kluster(vp
, pp
, &off
, &len
, koff
, klen
, flags
);
3697 ASSERT3U(btop(len
), ==, btopr(len
));
3700 * Can't push pages past end-of-file.
3702 if (off
>= zp
->z_size
) {
3703 /* ignore all pages */
3706 } else if (off
+ len
> zp
->z_size
) {
3707 int npages
= btopr(zp
->z_size
- off
);
3710 page_list_break(&pp
, &trunc
, npages
);
3711 /* ignore pages past end of file */
3713 pvn_write_done(trunc
, flags
);
3714 len
= zp
->z_size
- off
;
3717 if (zfs_owner_overquota(zfsvfs
, zp
, B_FALSE
) ||
3718 zfs_owner_overquota(zfsvfs
, zp
, B_TRUE
)) {
3723 tx
= dmu_tx_create(zfsvfs
->z_os
);
3724 dmu_tx_hold_write(tx
, zp
->z_id
, off
, len
);
3726 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3727 zfs_sa_upgrade_txholds(tx
, zp
);
3728 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3730 if (err
== ERESTART
) {
3739 if (zp
->z_blksz
<= PAGESIZE
) {
3740 caddr_t va
= zfs_map_page(pp
, S_READ
);
3741 ASSERT3U(len
, <=, PAGESIZE
);
3742 dmu_write(zfsvfs
->z_os
, zp
->z_id
, off
, len
, va
, tx
);
3743 zfs_unmap_page(pp
, va
);
3745 err
= dmu_write_pages(zfsvfs
->z_os
, zp
->z_id
, off
, len
, pp
, tx
);
3749 uint64_t mtime
[2], ctime
[2];
3750 sa_bulk_attr_t bulk
[3];
3753 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zfsvfs
), NULL
,
3755 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
), NULL
,
3757 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zfsvfs
), NULL
,
3759 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
3761 zfs_log_write(zfsvfs
->z_log
, tx
, TX_WRITE
, zp
, off
, len
, 0);
3766 pvn_write_done(pp
, (err
? B_ERROR
: 0) | flags
);
3776 * Copy the portion of the file indicated from pages into the file.
3777 * The pages are stored in a page list attached to the files vnode.
3779 * IN: vp - vnode of file to push page data to.
3780 * off - position in file to put data.
3781 * len - amount of data to write.
3782 * flags - flags to control the operation.
3783 * cr - credentials of caller.
3784 * ct - caller context.
3786 * RETURN: 0 if success
3787 * error code if failure
3790 * vp - ctime|mtime updated
3794 zfs_putpage(vnode_t
*vp
, offset_t off
, size_t len
, int flags
, cred_t
*cr
)
3796 znode_t
*zp
= VTOZ(vp
);
3797 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
3809 * Align this request to the file block size in case we kluster.
3810 * XXX - this can result in pretty aggresive locking, which can
3811 * impact simultanious read/write access. One option might be
3812 * to break up long requests (len == 0) into block-by-block
3813 * operations to get narrower locking.
3815 blksz
= zp
->z_blksz
;
3817 io_off
= P2ALIGN_TYPED(off
, blksz
, u_offset_t
);
3820 if (len
> 0 && ISP2(blksz
))
3821 io_len
= P2ROUNDUP_TYPED(len
+ (off
- io_off
), blksz
, size_t);
3827 * Search the entire vp list for pages >= io_off.
3829 rl
= zfs_range_lock(zp
, io_off
, UINT64_MAX
, RL_WRITER
);
3830 error
= pvn_vplist_dirty(vp
, io_off
, zfs_putapage
, flags
, cr
);
3833 rl
= zfs_range_lock(zp
, io_off
, io_len
, RL_WRITER
);
3835 if (off
> zp
->z_size
) {
3836 /* past end of file */
3837 zfs_range_unlock(rl
);
3842 len
= MIN(io_len
, P2ROUNDUP(zp
->z_size
, PAGESIZE
) - io_off
);
3844 for (off
= io_off
; io_off
< off
+ len
; io_off
+= io_len
) {
3845 if ((flags
& B_INVAL
) || ((flags
& B_ASYNC
) == 0)) {
3846 pp
= page_lookup(vp
, io_off
,
3847 (flags
& (B_INVAL
| B_FREE
)) ? SE_EXCL
: SE_SHARED
);
3849 pp
= page_lookup_nowait(vp
, io_off
,
3850 (flags
& B_FREE
) ? SE_EXCL
: SE_SHARED
);
3853 if (pp
!= NULL
&& pvn_getdirty(pp
, flags
)) {
3857 * Found a dirty page to push
3859 err
= zfs_putapage(vp
, pp
, &io_off
, &io_len
, flags
, cr
);
3867 zfs_range_unlock(rl
);
3868 if ((flags
& B_ASYNC
) == 0 || zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3869 zil_commit(zfsvfs
->z_log
, zp
->z_id
);
3873 #endif /* HAVE_MMAP */
3877 zfs_inactive(struct inode
*ip
)
3879 znode_t
*zp
= ITOZ(ip
);
3880 zfs_sb_t
*zsb
= ITOZSB(ip
);
3883 #ifdef HAVE_SNAPSHOT
3884 /* Early return for snapshot inode? */
3885 #endif /* HAVE_SNAPSHOT */
3887 rw_enter(&zsb
->z_teardown_inactive_lock
, RW_READER
);
3888 if (zp
->z_sa_hdl
== NULL
) {
3889 rw_exit(&zsb
->z_teardown_inactive_lock
);
3893 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
3894 dmu_tx_t
*tx
= dmu_tx_create(zsb
->z_os
);
3896 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3897 zfs_sa_upgrade_txholds(tx
, zp
);
3898 error
= dmu_tx_assign(tx
, TXG_WAIT
);
3902 mutex_enter(&zp
->z_lock
);
3903 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zsb
),
3904 (void *)&zp
->z_atime
, sizeof (zp
->z_atime
), tx
);
3905 zp
->z_atime_dirty
= 0;
3906 mutex_exit(&zp
->z_lock
);
3912 rw_exit(&zsb
->z_teardown_inactive_lock
);
3914 EXPORT_SYMBOL(zfs_inactive
);
3917 * Bounds-check the seek operation.
3919 * IN: ip - inode seeking within
3920 * ooff - old file offset
3921 * noffp - pointer to new file offset
3922 * ct - caller context
3924 * RETURN: 0 if success
3925 * EINVAL if new offset invalid
3929 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
3931 if (S_ISDIR(ip
->i_mode
))
3933 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
3935 EXPORT_SYMBOL(zfs_seek
);
3939 * Pre-filter the generic locking function to trap attempts to place
3940 * a mandatory lock on a memory mapped file.
3943 zfs_frlock(vnode_t
*vp
, int cmd
, flock64_t
*bfp
, int flag
, offset_t offset
,
3944 flk_callback_t
*flk_cbp
, cred_t
*cr
)
3946 znode_t
*zp
= VTOZ(vp
);
3947 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
3953 * We are following the UFS semantics with respect to mapcnt
3954 * here: If we see that the file is mapped already, then we will
3955 * return an error, but we don't worry about races between this
3956 * function and zfs_map().
3958 if (zp
->z_mapcnt
> 0 && MANDMODE(zp
->z_mode
)) {
3963 return (fs_frlock(vp
, cmd
, bfp
, flag
, offset
, flk_cbp
, cr
, ct
));
3967 * If we can't find a page in the cache, we will create a new page
3968 * and fill it with file data. For efficiency, we may try to fill
3969 * multiple pages at once (klustering) to fill up the supplied page
3970 * list. Note that the pages to be filled are held with an exclusive
3971 * lock to prevent access by other threads while they are being filled.
3974 zfs_fillpage(vnode_t
*vp
, u_offset_t off
, struct seg
*seg
,
3975 caddr_t addr
, page_t
*pl
[], size_t plsz
, enum seg_rw rw
)
3977 znode_t
*zp
= VTOZ(vp
);
3978 page_t
*pp
, *cur_pp
;
3979 objset_t
*os
= zp
->z_zfsvfs
->z_os
;
3980 u_offset_t io_off
, total
;
3984 if (plsz
== PAGESIZE
|| zp
->z_blksz
<= PAGESIZE
) {
3986 * We only have a single page, don't bother klustering
3990 pp
= page_create_va(vp
, io_off
, io_len
,
3991 PG_EXCL
| PG_WAIT
, seg
, addr
);
3994 * Try to find enough pages to fill the page list
3996 pp
= pvn_read_kluster(vp
, off
, seg
, addr
, &io_off
,
3997 &io_len
, off
, plsz
, 0);
4001 * The page already exists, nothing to do here.
4008 * Fill the pages in the kluster.
4011 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
4014 ASSERT3U(io_off
, ==, cur_pp
->p_offset
);
4015 va
= zfs_map_page(cur_pp
, S_WRITE
);
4016 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
4018 zfs_unmap_page(cur_pp
, va
);
4020 /* On error, toss the entire kluster */
4021 pvn_read_done(pp
, B_ERROR
);
4022 /* convert checksum errors into IO errors */
4027 cur_pp
= cur_pp
->p_next
;
4031 * Fill in the page list array from the kluster starting
4032 * from the desired offset `off'.
4033 * NOTE: the page list will always be null terminated.
4035 pvn_plist_init(pp
, pl
, plsz
, off
, io_len
, rw
);
4036 ASSERT(pl
== NULL
|| (*pl
)->p_offset
== off
);
4042 * Return pointers to the pages for the file region [off, off + len]
4043 * in the pl array. If plsz is greater than len, this function may
4044 * also return page pointers from after the specified region
4045 * (i.e. the region [off, off + plsz]). These additional pages are
4046 * only returned if they are already in the cache, or were created as
4047 * part of a klustered read.
4049 * IN: vp - vnode of file to get data from.
4050 * off - position in file to get data from.
4051 * len - amount of data to retrieve.
4052 * plsz - length of provided page list.
4053 * seg - segment to obtain pages for.
4054 * addr - virtual address of fault.
4055 * rw - mode of created pages.
4056 * cr - credentials of caller.
4057 * ct - caller context.
4059 * OUT: protp - protection mode of created pages.
4060 * pl - list of pages created.
4062 * RETURN: 0 if success
4063 * error code if failure
4066 * vp - atime updated
4070 zfs_getpage(vnode_t
*vp
, offset_t off
, size_t len
, uint_t
*protp
,
4071 page_t
*pl
[], size_t plsz
, struct seg
*seg
, caddr_t addr
,
4072 enum seg_rw rw
, cred_t
*cr
)
4074 znode_t
*zp
= VTOZ(vp
);
4075 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
4079 /* we do our own caching, faultahead is unnecessary */
4082 else if (len
> plsz
)
4085 len
= P2ROUNDUP(len
, PAGESIZE
);
4086 ASSERT(plsz
>= len
);
4095 * Loop through the requested range [off, off + len) looking
4096 * for pages. If we don't find a page, we will need to create
4097 * a new page and fill it with data from the file.
4100 if (*pl
= page_lookup(vp
, off
, SE_SHARED
))
4102 else if (err
= zfs_fillpage(vp
, off
, seg
, addr
, pl
, plsz
, rw
))
4105 ASSERT3U((*pl
)->p_offset
, ==, off
);
4109 ASSERT3U(len
, >=, PAGESIZE
);
4112 ASSERT3U(plsz
, >=, PAGESIZE
);
4119 * Fill out the page array with any pages already in the cache.
4122 (*pl
++ = page_lookup_nowait(vp
, off
, SE_SHARED
))) {
4129 * Release any pages we have previously locked.
4134 ZFS_ACCESSTIME_STAMP(zfsvfs
, zp
);
4144 * Request a memory map for a section of a file. This code interacts
4145 * with common code and the VM system as follows:
4147 * common code calls mmap(), which ends up in smmap_common()
4149 * this calls VOP_MAP(), which takes you into (say) zfs
4151 * zfs_map() calls as_map(), passing segvn_create() as the callback
4153 * segvn_create() creates the new segment and calls VOP_ADDMAP()
4155 * zfs_addmap() updates z_mapcnt
4159 zfs_map(vnode_t
*vp
, offset_t off
, struct as
*as
, caddr_t
*addrp
,
4160 size_t len
, uchar_t prot
, uchar_t maxprot
, uint_t flags
, cred_t
*cr
)
4162 znode_t
*zp
= VTOZ(vp
);
4163 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
4164 segvn_crargs_t vn_a
;
4170 if ((prot
& PROT_WRITE
) && (zp
->z_pflags
&
4171 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4176 if ((prot
& (PROT_READ
| PROT_EXEC
)) &&
4177 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4182 if (vp
->v_flag
& VNOMAP
) {
4187 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4192 if (vp
->v_type
!= VREG
) {
4198 * If file is locked, disallow mapping.
4200 if (MANDMODE(zp
->z_mode
) && vn_has_flocks(vp
)) {
4206 error
= choose_addr(as
, addrp
, len
, off
, ADDR_VACALIGN
, flags
);
4214 vn_a
.offset
= (u_offset_t
)off
;
4215 vn_a
.type
= flags
& MAP_TYPE
;
4217 vn_a
.maxprot
= maxprot
;
4220 vn_a
.flags
= flags
& ~MAP_TYPE
;
4222 vn_a
.lgrp_mem_policy_flags
= 0;
4224 error
= as_map(as
, *addrp
, len
, segvn_create
, &vn_a
);
4233 zfs_addmap(vnode_t
*vp
, offset_t off
, struct as
*as
, caddr_t addr
,
4234 size_t len
, uchar_t prot
, uchar_t maxprot
, uint_t flags
, cred_t
*cr
)
4236 uint64_t pages
= btopr(len
);
4238 atomic_add_64(&VTOZ(vp
)->z_mapcnt
, pages
);
4243 * The reason we push dirty pages as part of zfs_delmap() is so that we get a
4244 * more accurate mtime for the associated file. Since we don't have a way of
4245 * detecting when the data was actually modified, we have to resort to
4246 * heuristics. If an explicit msync() is done, then we mark the mtime when the
4247 * last page is pushed. The problem occurs when the msync() call is omitted,
4248 * which by far the most common case:
4256 * putpage() via fsflush
4258 * If we wait until fsflush to come along, we can have a modification time that
4259 * is some arbitrary point in the future. In order to prevent this in the
4260 * common case, we flush pages whenever a (MAP_SHARED, PROT_WRITE) mapping is
4265 zfs_delmap(vnode_t
*vp
, offset_t off
, struct as
*as
, caddr_t addr
,
4266 size_t len
, uint_t prot
, uint_t maxprot
, uint_t flags
, cred_t
*cr
)
4268 uint64_t pages
= btopr(len
);
4270 ASSERT3U(VTOZ(vp
)->z_mapcnt
, >=, pages
);
4271 atomic_add_64(&VTOZ(vp
)->z_mapcnt
, -pages
);
4273 if ((flags
& MAP_SHARED
) && (prot
& PROT_WRITE
) &&
4274 vn_has_cached_data(vp
))
4275 (void) VOP_PUTPAGE(vp
, off
, len
, B_ASYNC
, cr
, ct
);
4279 #endif /* HAVE_MMAP */
4282 * convoff - converts the given data (start, whence) to the
4286 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4291 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4292 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4296 switch (lckdat
->l_whence
) {
4298 lckdat
->l_start
+= offset
;
4301 lckdat
->l_start
+= vap
.va_size
;
4309 if (lckdat
->l_start
< 0)
4314 lckdat
->l_start
-= offset
;
4317 lckdat
->l_start
-= vap
.va_size
;
4325 lckdat
->l_whence
= (short)whence
;
4330 * Free or allocate space in a file. Currently, this function only
4331 * supports the `F_FREESP' command. However, this command is somewhat
4332 * misnamed, as its functionality includes the ability to allocate as
4333 * well as free space.
4335 * IN: ip - inode of file to free data in.
4336 * cmd - action to take (only F_FREESP supported).
4337 * bfp - section of file to free/alloc.
4338 * flag - current file open mode flags.
4339 * offset - current file offset.
4340 * cr - credentials of caller [UNUSED].
4342 * RETURN: 0 if success
4343 * error code if failure
4346 * ip - ctime|mtime updated
4350 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4351 offset_t offset
, cred_t
*cr
)
4353 znode_t
*zp
= ITOZ(ip
);
4354 zfs_sb_t
*zsb
= ITOZSB(ip
);
4361 if (cmd
!= F_FREESP
) {
4366 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4371 if (bfp
->l_len
< 0) {
4377 len
= bfp
->l_len
; /* 0 means from off to end of file */
4379 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4384 EXPORT_SYMBOL(zfs_space
);
4388 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4390 znode_t
*zp
= ITOZ(ip
);
4391 zfs_sb_t
*zsb
= ITOZSB(ip
);
4394 uint64_t object
= zp
->z_id
;
4401 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zsb
),
4402 &gen64
, sizeof (uint64_t))) != 0) {
4407 gen
= (uint32_t)gen64
;
4409 size
= (zsb
->z_parent
!= zsb
) ? LONG_FID_LEN
: SHORT_FID_LEN
;
4410 if (fidp
->fid_len
< size
) {
4411 fidp
->fid_len
= size
;
4416 zfid
= (zfid_short_t
*)fidp
;
4418 zfid
->zf_len
= size
;
4420 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4421 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4423 /* Must have a non-zero generation number to distinguish from .zfs */
4426 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4427 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4429 if (size
== LONG_FID_LEN
) {
4430 uint64_t objsetid
= dmu_objset_id(zsb
->z_os
);
4433 zlfid
= (zfid_long_t
*)fidp
;
4435 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
4436 zlfid
->zf_setid
[i
] = (uint8_t)(objsetid
>> (8 * i
));
4438 /* XXX - this should be the generation number for the objset */
4439 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
4440 zlfid
->zf_setgen
[i
] = 0;
4446 EXPORT_SYMBOL(zfs_fid
);
4450 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4452 znode_t
*zp
= ITOZ(ip
);
4453 zfs_sb_t
*zsb
= ITOZSB(ip
);
4455 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4459 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4464 EXPORT_SYMBOL(zfs_getsecattr
);
4468 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4470 znode_t
*zp
= ITOZ(ip
);
4471 zfs_sb_t
*zsb
= ITOZSB(ip
);
4473 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4474 zilog_t
*zilog
= zsb
->z_log
;
4479 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4481 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4482 zil_commit(zilog
, 0);
4487 EXPORT_SYMBOL(zfs_setsecattr
);
4489 #ifdef HAVE_UIO_ZEROCOPY
4491 * Tunable, both must be a power of 2.
4493 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4494 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4495 * an arcbuf for a partial block read
4497 int zcr_blksz_min
= (1 << 10); /* 1K */
4498 int zcr_blksz_max
= (1 << 17); /* 128K */
4502 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4504 znode_t
*zp
= ITOZ(ip
);
4505 zfs_sb_t
*zsb
= ITOZSB(ip
);
4506 int max_blksz
= zsb
->z_max_blksz
;
4507 uio_t
*uio
= &xuio
->xu_uio
;
4508 ssize_t size
= uio
->uio_resid
;
4509 offset_t offset
= uio
->uio_loffset
;
4514 int preamble
, postamble
;
4516 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4524 * Loan out an arc_buf for write if write size is bigger than
4525 * max_blksz, and the file's block size is also max_blksz.
4528 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4533 * Caller requests buffers for write before knowing where the
4534 * write offset might be (e.g. NFS TCP write).
4539 preamble
= P2PHASE(offset
, blksz
);
4541 preamble
= blksz
- preamble
;
4546 postamble
= P2PHASE(size
, blksz
);
4549 fullblk
= size
/ blksz
;
4550 (void) dmu_xuio_init(xuio
,
4551 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4554 * Have to fix iov base/len for partial buffers. They
4555 * currently represent full arc_buf's.
4558 /* data begins in the middle of the arc_buf */
4559 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4562 (void) dmu_xuio_add(xuio
, abuf
,
4563 blksz
- preamble
, preamble
);
4566 for (i
= 0; i
< fullblk
; i
++) {
4567 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4570 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4574 /* data ends in the middle of the arc_buf */
4575 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4578 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4583 * Loan out an arc_buf for read if the read size is larger than
4584 * the current file block size. Block alignment is not
4585 * considered. Partial arc_buf will be loaned out for read.
4587 blksz
= zp
->z_blksz
;
4588 if (blksz
< zcr_blksz_min
)
4589 blksz
= zcr_blksz_min
;
4590 if (blksz
> zcr_blksz_max
)
4591 blksz
= zcr_blksz_max
;
4592 /* avoid potential complexity of dealing with it */
4593 if (blksz
> max_blksz
) {
4598 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4612 uio
->uio_extflg
= UIO_XUIO
;
4613 XUIO_XUZC_RW(xuio
) = ioflag
;
4620 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4624 int ioflag
= XUIO_XUZC_RW(xuio
);
4626 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4628 i
= dmu_xuio_cnt(xuio
);
4630 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4632 * if abuf == NULL, it must be a write buffer
4633 * that has been returned in zfs_write().
4636 dmu_return_arcbuf(abuf
);
4637 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4640 dmu_xuio_fini(xuio
);
4643 #endif /* HAVE_UIO_ZEROCOPY */