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.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
26 /* Portions Copyright 2007 Jeremy Teo */
27 /* Portions Copyright 2010 Robert Milkowski */
30 #include <sys/types.h>
31 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/sysmacros.h>
35 #include <sys/resource.h>
37 #include <sys/vfs_opreg.h>
41 #include <sys/taskq.h>
43 #include <sys/vmsystm.h>
44 #include <sys/atomic.h>
46 #include <sys/pathname.h>
47 #include <sys/cmn_err.h>
48 #include <sys/errno.h>
49 #include <sys/unistd.h>
50 #include <sys/zfs_dir.h>
51 #include <sys/zfs_acl.h>
52 #include <sys/zfs_ioctl.h>
53 #include <sys/fs/zfs.h>
55 #include <sys/dmu_objset.h>
61 #include <sys/dirent.h>
62 #include <sys/policy.h>
63 #include <sys/sunddi.h>
66 #include "fs/fs_subr.h"
67 #include <sys/zfs_ctldir.h>
68 #include <sys/zfs_fuid.h>
69 #include <sys/zfs_sa.h>
70 #include <sys/zfs_vnops.h>
72 #include <sys/zfs_rlock.h>
73 #include <sys/extdirent.h>
74 #include <sys/kidmap.h>
82 * Each vnode op performs some logical unit of work. To do this, the ZPL must
83 * properly lock its in-core state, create a DMU transaction, do the work,
84 * record this work in the intent log (ZIL), commit the DMU transaction,
85 * and wait for the intent log to commit if it is a synchronous operation.
86 * Moreover, the vnode ops must work in both normal and log replay context.
87 * The ordering of events is important to avoid deadlocks and references
88 * to freed memory. The example below illustrates the following Big Rules:
90 * (1) A check must be made in each zfs thread for a mounted file system.
91 * This is done avoiding races using ZFS_ENTER(zsb).
92 * A ZFS_EXIT(zsb) is needed before all returns. Any znodes
93 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
94 * can return EIO from the calling function.
96 * (2) iput() should always be the last thing except for zil_commit()
97 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
98 * First, if it's the last reference, the vnode/znode
99 * can be freed, so the zp may point to freed memory. Second, the last
100 * reference will call zfs_zinactive(), which may induce a lot of work --
101 * pushing cached pages (which acquires range locks) and syncing out
102 * cached atime changes. Third, zfs_zinactive() may require a new tx,
103 * which could deadlock the system if you were already holding one.
104 * If you must call iput() within a tx then use iput_ASYNC().
106 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
107 * as they can span dmu_tx_assign() calls.
109 * (4) Always pass TXG_NOWAIT as the second argument to dmu_tx_assign().
110 * This is critical because we don't want to block while holding locks.
111 * Note, in particular, that if a lock is sometimes acquired before
112 * the tx assigns, and sometimes after (e.g. z_lock), then failing to
113 * use a non-blocking assign can deadlock the system. The scenario:
115 * Thread A has grabbed a lock before calling dmu_tx_assign().
116 * Thread B is in an already-assigned tx, and blocks for this lock.
117 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
118 * forever, because the previous txg can't quiesce until B's tx commits.
120 * If dmu_tx_assign() returns ERESTART and zsb->z_assign is TXG_NOWAIT,
121 * then drop all locks, call dmu_tx_wait(), and try again.
123 * (5) If the operation succeeded, generate the intent log entry for it
124 * before dropping locks. This ensures that the ordering of events
125 * in the intent log matches the order in which they actually occurred.
126 * During ZIL replay the zfs_log_* functions will update the sequence
127 * number to indicate the zil transaction has replayed.
129 * (6) At the end of each vnode op, the DMU tx must always commit,
130 * regardless of whether there were any errors.
132 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
133 * to ensure that synchronous semantics are provided when necessary.
135 * In general, this is how things should be ordered in each vnode op:
137 * ZFS_ENTER(zsb); // exit if unmounted
139 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
140 * rw_enter(...); // grab any other locks you need
141 * tx = dmu_tx_create(...); // get DMU tx
142 * dmu_tx_hold_*(); // hold each object you might modify
143 * error = dmu_tx_assign(tx, TXG_NOWAIT); // try to assign
145 * rw_exit(...); // drop locks
146 * zfs_dirent_unlock(dl); // unlock directory entry
147 * iput(...); // release held vnodes
148 * if (error == ERESTART) {
153 * dmu_tx_abort(tx); // abort DMU tx
154 * ZFS_EXIT(zsb); // finished in zfs
155 * return (error); // really out of space
157 * error = do_real_work(); // do whatever this VOP does
159 * zfs_log_*(...); // on success, make ZIL entry
160 * dmu_tx_commit(tx); // commit DMU tx -- error or not
161 * rw_exit(...); // drop locks
162 * zfs_dirent_unlock(dl); // unlock directory entry
163 * iput(...); // release held vnodes
164 * zil_commit(zilog, foid); // synchronous when necessary
165 * ZFS_EXIT(zsb); // finished in zfs
166 * return (error); // done, report error
170 * Virus scanning is unsupported. It would be possible to add a hook
171 * here to performance the required virus scan. This could be done
172 * entirely in the kernel or potentially as an update to invoke a
176 zfs_vscan(struct inode
*ip
, cred_t
*cr
, int async
)
183 zfs_open(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
185 znode_t
*zp
= ITOZ(ip
);
186 zfs_sb_t
*zsb
= ITOZSB(ip
);
191 /* Honor ZFS_APPENDONLY file attribute */
192 if ((mode
& FMODE_WRITE
) && (zp
->z_pflags
& ZFS_APPENDONLY
) &&
193 ((flag
& O_APPEND
) == 0)) {
198 /* Virus scan eligible files on open */
199 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
200 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0) {
201 if (zfs_vscan(ip
, cr
, 0) != 0) {
207 /* Keep a count of the synchronous opens in the znode */
209 atomic_inc_32(&zp
->z_sync_cnt
);
214 EXPORT_SYMBOL(zfs_open
);
218 zfs_close(struct inode
*ip
, int flag
, cred_t
*cr
)
220 znode_t
*zp
= ITOZ(ip
);
221 zfs_sb_t
*zsb
= ITOZSB(ip
);
227 * Zero the synchronous opens in the znode. Under Linux the
228 * zfs_close() hook is not symmetric with zfs_open(), it is
229 * only called once when the last reference is dropped.
234 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
235 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0)
236 VERIFY(zfs_vscan(ip
, cr
, 1) == 0);
241 EXPORT_SYMBOL(zfs_close
);
245 * When a file is memory mapped, we must keep the IO data synchronized
246 * between the DMU cache and the memory mapped pages. What this means:
248 * On Write: If we find a memory mapped page, we write to *both*
249 * the page and the dmu buffer.
252 update_pages(struct inode
*ip
, int64_t start
, int len
,
253 objset_t
*os
, uint64_t oid
)
255 struct address_space
*mp
= ip
->i_mapping
;
261 off
= start
& (PAGE_CACHE_SIZE
-1);
262 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
263 nbytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
265 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
267 if (mapping_writably_mapped(mp
))
268 flush_dcache_page(pp
);
271 (void) dmu_read(os
, oid
, start
+off
, nbytes
, pb
+off
,
275 if (mapping_writably_mapped(mp
))
276 flush_dcache_page(pp
);
278 mark_page_accessed(pp
);
282 page_cache_release(pp
);
291 * When a file is memory mapped, we must keep the IO data synchronized
292 * between the DMU cache and the memory mapped pages. What this means:
294 * On Read: We "read" preferentially from memory mapped pages,
295 * else we default from the dmu buffer.
297 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
298 * the file is memory mapped.
301 mappedread(struct inode
*ip
, int nbytes
, uio_t
*uio
)
303 struct address_space
*mp
= ip
->i_mapping
;
305 znode_t
*zp
= ITOZ(ip
);
306 objset_t
*os
= ITOZSB(ip
)->z_os
;
313 start
= uio
->uio_loffset
;
314 off
= start
& (PAGE_CACHE_SIZE
-1);
315 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
316 bytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
318 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
320 ASSERT(PageUptodate(pp
));
323 error
= uiomove(pb
+ off
, bytes
, UIO_READ
, uio
);
326 if (mapping_writably_mapped(mp
))
327 flush_dcache_page(pp
);
329 mark_page_accessed(pp
);
331 page_cache_release(pp
);
333 error
= dmu_read_uio(os
, zp
->z_id
, uio
, bytes
);
345 unsigned long zfs_read_chunk_size
= 1024 * 1024; /* Tunable */
348 * Read bytes from specified file into supplied buffer.
350 * IN: ip - inode of file to be read from.
351 * uio - structure supplying read location, range info,
353 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
354 * O_DIRECT flag; used to bypass page cache.
355 * cr - credentials of caller.
357 * OUT: uio - updated offset and range, buffer filled.
359 * RETURN: 0 if success
360 * error code if failure
363 * inode - atime updated if byte count > 0
367 zfs_read(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
369 znode_t
*zp
= ITOZ(ip
);
370 zfs_sb_t
*zsb
= ITOZSB(ip
);
375 #ifdef HAVE_UIO_ZEROCOPY
377 #endif /* HAVE_UIO_ZEROCOPY */
383 if (zp
->z_pflags
& ZFS_AV_QUARANTINED
) {
389 * Validate file offset
391 if (uio
->uio_loffset
< (offset_t
)0) {
397 * Fasttrack empty reads
399 if (uio
->uio_resid
== 0) {
405 * Check for mandatory locks
407 if (mandatory_lock(ip
) &&
408 !lock_may_read(ip
, uio
->uio_loffset
, uio
->uio_resid
)) {
414 * If we're in FRSYNC mode, sync out this znode before reading it.
416 if (ioflag
& FRSYNC
|| zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
417 zil_commit(zsb
->z_log
, zp
->z_id
);
420 * Lock the range against changes.
422 rl
= zfs_range_lock(zp
, uio
->uio_loffset
, uio
->uio_resid
, RL_READER
);
425 * If we are reading past end-of-file we can skip
426 * to the end; but we might still need to set atime.
428 if (uio
->uio_loffset
>= zp
->z_size
) {
433 ASSERT(uio
->uio_loffset
< zp
->z_size
);
434 n
= MIN(uio
->uio_resid
, zp
->z_size
- uio
->uio_loffset
);
436 #ifdef HAVE_UIO_ZEROCOPY
437 if ((uio
->uio_extflg
== UIO_XUIO
) &&
438 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
)) {
440 int blksz
= zp
->z_blksz
;
441 uint64_t offset
= uio
->uio_loffset
;
443 xuio
= (xuio_t
*)uio
;
445 nblk
= (P2ROUNDUP(offset
+ n
, blksz
) - P2ALIGN(offset
,
448 ASSERT(offset
+ n
<= blksz
);
451 (void) dmu_xuio_init(xuio
, nblk
);
453 if (vn_has_cached_data(ip
)) {
455 * For simplicity, we always allocate a full buffer
456 * even if we only expect to read a portion of a block.
458 while (--nblk
>= 0) {
459 (void) dmu_xuio_add(xuio
,
460 dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
465 #endif /* HAVE_UIO_ZEROCOPY */
468 nbytes
= MIN(n
, zfs_read_chunk_size
-
469 P2PHASE(uio
->uio_loffset
, zfs_read_chunk_size
));
471 if (zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
472 error
= mappedread(ip
, nbytes
, uio
);
474 error
= dmu_read_uio(os
, zp
->z_id
, uio
, nbytes
);
477 /* convert checksum errors into IO errors */
486 zfs_range_unlock(rl
);
488 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
489 zfs_inode_update(zp
);
493 EXPORT_SYMBOL(zfs_read
);
496 * Write the bytes to a file.
498 * IN: ip - inode of file to be written to.
499 * uio - structure supplying write location, range info,
501 * ioflag - FAPPEND flag set if in append mode.
502 * O_DIRECT flag; used to bypass page cache.
503 * cr - credentials of caller.
505 * OUT: uio - updated offset and range.
507 * RETURN: 0 if success
508 * error code if failure
511 * ip - ctime|mtime updated if byte count > 0
516 zfs_write(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
518 znode_t
*zp
= ITOZ(ip
);
519 rlim64_t limit
= uio
->uio_limit
;
520 ssize_t start_resid
= uio
->uio_resid
;
524 zfs_sb_t
*zsb
= ZTOZSB(zp
);
529 int max_blksz
= zsb
->z_max_blksz
;
532 iovec_t
*aiov
= NULL
;
535 iovec_t
*iovp
= uio
->uio_iov
;
538 sa_bulk_attr_t bulk
[4];
539 uint64_t mtime
[2], ctime
[2];
540 ASSERTV(int iovcnt
= uio
->uio_iovcnt
);
543 * Fasttrack empty write
549 if (limit
== RLIM64_INFINITY
|| limit
> MAXOFFSET_T
)
555 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
556 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
557 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
, &zp
->z_size
, 8);
558 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
562 * If immutable or not appending then return EPERM
564 if ((zp
->z_pflags
& (ZFS_IMMUTABLE
| ZFS_READONLY
)) ||
565 ((zp
->z_pflags
& ZFS_APPENDONLY
) && !(ioflag
& FAPPEND
) &&
566 (uio
->uio_loffset
< zp
->z_size
))) {
574 * Validate file offset
576 woff
= ioflag
& FAPPEND
? zp
->z_size
: uio
->uio_loffset
;
583 * Check for mandatory locks before calling zfs_range_lock()
584 * in order to prevent a deadlock with locks set via fcntl().
586 if (mandatory_lock(ip
) && !lock_may_write(ip
, woff
, n
)) {
591 #ifdef HAVE_UIO_ZEROCOPY
593 * Pre-fault the pages to ensure slow (eg NFS) pages
595 * Skip this if uio contains loaned arc_buf.
597 if ((uio
->uio_extflg
== UIO_XUIO
) &&
598 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
))
599 xuio
= (xuio_t
*)uio
;
601 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
602 #endif /* HAVE_UIO_ZEROCOPY */
605 * If in append mode, set the io offset pointer to eof.
607 if (ioflag
& FAPPEND
) {
609 * Obtain an appending range lock to guarantee file append
610 * semantics. We reset the write offset once we have the lock.
612 rl
= zfs_range_lock(zp
, 0, n
, RL_APPEND
);
614 if (rl
->r_len
== UINT64_MAX
) {
616 * We overlocked the file because this write will cause
617 * the file block size to increase.
618 * Note that zp_size cannot change with this lock held.
622 uio
->uio_loffset
= woff
;
625 * Note that if the file block size will change as a result of
626 * this write, then this range lock will lock the entire file
627 * so that we can re-write the block safely.
629 rl
= zfs_range_lock(zp
, woff
, n
, RL_WRITER
);
633 zfs_range_unlock(rl
);
638 if ((woff
+ n
) > limit
|| woff
> (limit
- n
))
641 /* Will this write extend the file length? */
642 write_eof
= (woff
+ n
> zp
->z_size
);
644 end_size
= MAX(zp
->z_size
, woff
+ n
);
647 * Write the file in reasonable size chunks. Each chunk is written
648 * in a separate transaction; this keeps the intent log records small
649 * and allows us to do more fine-grained space accounting.
653 woff
= uio
->uio_loffset
;
655 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
656 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
658 dmu_return_arcbuf(abuf
);
663 if (xuio
&& abuf
== NULL
) {
664 ASSERT(i_iov
< iovcnt
);
666 abuf
= dmu_xuio_arcbuf(xuio
, i_iov
);
667 dmu_xuio_clear(xuio
, i_iov
);
668 ASSERT((aiov
->iov_base
== abuf
->b_data
) ||
669 ((char *)aiov
->iov_base
- (char *)abuf
->b_data
+
670 aiov
->iov_len
== arc_buf_size(abuf
)));
672 } else if (abuf
== NULL
&& n
>= max_blksz
&&
673 woff
>= zp
->z_size
&&
674 P2PHASE(woff
, max_blksz
) == 0 &&
675 zp
->z_blksz
== max_blksz
) {
677 * This write covers a full block. "Borrow" a buffer
678 * from the dmu so that we can fill it before we enter
679 * a transaction. This avoids the possibility of
680 * holding up the transaction if the data copy hangs
681 * up on a pagefault (e.g., from an NFS server mapping).
685 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
687 ASSERT(abuf
!= NULL
);
688 ASSERT(arc_buf_size(abuf
) == max_blksz
);
689 if ((error
= uiocopy(abuf
->b_data
, max_blksz
,
690 UIO_WRITE
, uio
, &cbytes
))) {
691 dmu_return_arcbuf(abuf
);
694 ASSERT(cbytes
== max_blksz
);
698 * Start a transaction.
700 tx
= dmu_tx_create(zsb
->z_os
);
701 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
702 dmu_tx_hold_write(tx
, zp
->z_id
, woff
, MIN(n
, max_blksz
));
703 zfs_sa_upgrade_txholds(tx
, zp
);
704 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
706 if (error
== ERESTART
) {
713 dmu_return_arcbuf(abuf
);
718 * If zfs_range_lock() over-locked we grow the blocksize
719 * and then reduce the lock range. This will only happen
720 * on the first iteration since zfs_range_reduce() will
721 * shrink down r_len to the appropriate size.
723 if (rl
->r_len
== UINT64_MAX
) {
726 if (zp
->z_blksz
> max_blksz
) {
727 ASSERT(!ISP2(zp
->z_blksz
));
728 new_blksz
= MIN(end_size
, SPA_MAXBLOCKSIZE
);
730 new_blksz
= MIN(end_size
, max_blksz
);
732 zfs_grow_blocksize(zp
, new_blksz
, tx
);
733 zfs_range_reduce(rl
, woff
, n
);
737 * XXX - should we really limit each write to z_max_blksz?
738 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
740 nbytes
= MIN(n
, max_blksz
- P2PHASE(woff
, max_blksz
));
743 tx_bytes
= uio
->uio_resid
;
744 error
= dmu_write_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
746 tx_bytes
-= uio
->uio_resid
;
749 ASSERT(xuio
== NULL
|| tx_bytes
== aiov
->iov_len
);
751 * If this is not a full block write, but we are
752 * extending the file past EOF and this data starts
753 * block-aligned, use assign_arcbuf(). Otherwise,
754 * write via dmu_write().
756 if (tx_bytes
< max_blksz
&& (!write_eof
||
757 aiov
->iov_base
!= abuf
->b_data
)) {
759 dmu_write(zsb
->z_os
, zp
->z_id
, woff
,
760 aiov
->iov_len
, aiov
->iov_base
, tx
);
761 dmu_return_arcbuf(abuf
);
762 xuio_stat_wbuf_copied();
764 ASSERT(xuio
|| tx_bytes
== max_blksz
);
765 dmu_assign_arcbuf(sa_get_db(zp
->z_sa_hdl
),
768 ASSERT(tx_bytes
<= uio
->uio_resid
);
769 uioskip(uio
, tx_bytes
);
772 if (tx_bytes
&& zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
773 update_pages(ip
, woff
, tx_bytes
, zsb
->z_os
, zp
->z_id
);
776 * If we made no progress, we're done. If we made even
777 * partial progress, update the znode and ZIL accordingly.
780 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
781 (void *)&zp
->z_size
, sizeof (uint64_t), tx
);
788 * Clear Set-UID/Set-GID bits on successful write if not
789 * privileged and at least one of the excute bits is set.
791 * It would be nice to to this after all writes have
792 * been done, but that would still expose the ISUID/ISGID
793 * to another app after the partial write is committed.
795 * Note: we don't call zfs_fuid_map_id() here because
796 * user 0 is not an ephemeral uid.
798 mutex_enter(&zp
->z_acl_lock
);
799 if ((zp
->z_mode
& (S_IXUSR
| (S_IXUSR
>> 3) |
800 (S_IXUSR
>> 6))) != 0 &&
801 (zp
->z_mode
& (S_ISUID
| S_ISGID
)) != 0 &&
802 secpolicy_vnode_setid_retain(cr
,
803 (zp
->z_mode
& S_ISUID
) != 0 && zp
->z_uid
== 0) != 0) {
805 zp
->z_mode
&= ~(S_ISUID
| S_ISGID
);
806 newmode
= zp
->z_mode
;
807 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_MODE(zsb
),
808 (void *)&newmode
, sizeof (uint64_t), tx
);
810 mutex_exit(&zp
->z_acl_lock
);
812 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
816 * Update the file size (zp_size) if it has changed;
817 * account for possible concurrent updates.
819 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
820 (void) atomic_cas_64(&zp
->z_size
, end_size
,
825 * If we are replaying and eof is non zero then force
826 * the file size to the specified eof. Note, there's no
827 * concurrency during replay.
829 if (zsb
->z_replay
&& zsb
->z_replay_eof
!= 0)
830 zp
->z_size
= zsb
->z_replay_eof
;
832 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
834 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
);
839 ASSERT(tx_bytes
== nbytes
);
843 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
846 zfs_range_unlock(rl
);
849 * If we're in replay mode, or we made no progress, return error.
850 * Otherwise, it's at least a partial write, so it's successful.
852 if (zsb
->z_replay
|| uio
->uio_resid
== start_resid
) {
857 if (ioflag
& (FSYNC
| FDSYNC
) ||
858 zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
859 zil_commit(zilog
, zp
->z_id
);
861 zfs_inode_update(zp
);
865 EXPORT_SYMBOL(zfs_write
);
868 iput_async(struct inode
*ip
, taskq_t
*taskq
)
870 ASSERT(atomic_read(&ip
->i_count
) > 0);
871 if (atomic_read(&ip
->i_count
) == 1)
872 taskq_dispatch(taskq
, (task_func_t
*)iput
, ip
, TQ_PUSHPAGE
);
878 zfs_get_done(zgd_t
*zgd
, int error
)
880 znode_t
*zp
= zgd
->zgd_private
;
881 objset_t
*os
= ZTOZSB(zp
)->z_os
;
884 dmu_buf_rele(zgd
->zgd_db
, zgd
);
886 zfs_range_unlock(zgd
->zgd_rl
);
889 * Release the vnode asynchronously as we currently have the
890 * txg stopped from syncing.
892 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
894 if (error
== 0 && zgd
->zgd_bp
)
895 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
897 kmem_free(zgd
, sizeof (zgd_t
));
901 static int zil_fault_io
= 0;
905 * Get data to generate a TX_WRITE intent log record.
908 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
911 objset_t
*os
= zsb
->z_os
;
913 uint64_t object
= lr
->lr_foid
;
914 uint64_t offset
= lr
->lr_offset
;
915 uint64_t size
= lr
->lr_length
;
916 blkptr_t
*bp
= &lr
->lr_blkptr
;
925 * Nothing to do if the file has been removed
927 if (zfs_zget(zsb
, object
, &zp
) != 0)
929 if (zp
->z_unlinked
) {
931 * Release the vnode asynchronously as we currently have the
932 * txg stopped from syncing.
934 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
938 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_PUSHPAGE
);
939 zgd
->zgd_zilog
= zsb
->z_log
;
940 zgd
->zgd_private
= zp
;
943 * Write records come in two flavors: immediate and indirect.
944 * For small writes it's cheaper to store the data with the
945 * log record (immediate); for large writes it's cheaper to
946 * sync the data and get a pointer to it (indirect) so that
947 * we don't have to write the data twice.
949 if (buf
!= NULL
) { /* immediate write */
950 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
, RL_READER
);
951 /* test for truncation needs to be done while range locked */
952 if (offset
>= zp
->z_size
) {
955 error
= dmu_read(os
, object
, offset
, size
, buf
,
956 DMU_READ_NO_PREFETCH
);
958 ASSERT(error
== 0 || error
== ENOENT
);
959 } else { /* indirect write */
961 * Have to lock the whole block to ensure when it's
962 * written out and it's checksum is being calculated
963 * that no one can change the data. We need to re-check
964 * blocksize after we get the lock in case it's changed!
969 blkoff
= ISP2(size
) ? P2PHASE(offset
, size
) : offset
;
971 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
,
973 if (zp
->z_blksz
== size
)
976 zfs_range_unlock(zgd
->zgd_rl
);
978 /* test for truncation needs to be done while range locked */
979 if (lr
->lr_offset
>= zp
->z_size
)
988 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
989 DMU_READ_NO_PREFETCH
);
995 ASSERT(db
->db_offset
== offset
);
996 ASSERT(db
->db_size
== size
);
998 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
1000 ASSERT(error
|| lr
->lr_length
<= zp
->z_blksz
);
1003 * On success, we need to wait for the write I/O
1004 * initiated by dmu_sync() to complete before we can
1005 * release this dbuf. We will finish everything up
1006 * in the zfs_get_done() callback.
1011 if (error
== EALREADY
) {
1012 lr
->lr_common
.lrc_txtype
= TX_WRITE2
;
1018 zfs_get_done(zgd
, error
);
1025 zfs_access(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
1027 znode_t
*zp
= ITOZ(ip
);
1028 zfs_sb_t
*zsb
= ITOZSB(ip
);
1034 if (flag
& V_ACE_MASK
)
1035 error
= zfs_zaccess(zp
, mode
, flag
, B_FALSE
, cr
);
1037 error
= zfs_zaccess_rwx(zp
, mode
, flag
, cr
);
1042 EXPORT_SYMBOL(zfs_access
);
1045 * Lookup an entry in a directory, or an extended attribute directory.
1046 * If it exists, return a held inode reference for it.
1048 * IN: dip - inode of directory to search.
1049 * nm - name of entry to lookup.
1050 * flags - LOOKUP_XATTR set if looking for an attribute.
1051 * cr - credentials of caller.
1052 * direntflags - directory lookup flags
1053 * realpnp - returned pathname.
1055 * OUT: ipp - inode of located entry, NULL if not found.
1057 * RETURN: 0 if success
1058 * error code if failure
1065 zfs_lookup(struct inode
*dip
, char *nm
, struct inode
**ipp
, int flags
,
1066 cred_t
*cr
, int *direntflags
, pathname_t
*realpnp
)
1068 znode_t
*zdp
= ITOZ(dip
);
1069 zfs_sb_t
*zsb
= ITOZSB(dip
);
1073 if (!(flags
& (LOOKUP_XATTR
| FIGNORECASE
))) {
1075 if (!S_ISDIR(dip
->i_mode
)) {
1077 } else if (zdp
->z_sa_hdl
== NULL
) {
1081 if (nm
[0] == 0 || (nm
[0] == '.' && nm
[1] == '\0')) {
1082 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1091 vnode_t
*tvp
= dnlc_lookup(dvp
, nm
);
1094 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1099 if (tvp
== DNLC_NO_VNODE
) {
1104 return (specvp_check(vpp
, cr
));
1107 #endif /* HAVE_DNLC */
1116 if (flags
& LOOKUP_XATTR
) {
1118 * We don't allow recursive attributes..
1119 * Maybe someday we will.
1121 if (zdp
->z_pflags
& ZFS_XATTR
) {
1126 if ((error
= zfs_get_xattrdir(zdp
, ipp
, cr
, flags
))) {
1132 * Do we have permission to get into attribute directory?
1135 if ((error
= zfs_zaccess(ITOZ(*ipp
), ACE_EXECUTE
, 0,
1145 if (!S_ISDIR(dip
->i_mode
)) {
1151 * Check accessibility of directory.
1154 if ((error
= zfs_zaccess(zdp
, ACE_EXECUTE
, 0, B_FALSE
, cr
))) {
1159 if (zsb
->z_utf8
&& u8_validate(nm
, strlen(nm
),
1160 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1165 error
= zfs_dirlook(zdp
, nm
, ipp
, flags
, direntflags
, realpnp
);
1166 if ((error
== 0) && (*ipp
))
1167 zfs_inode_update(ITOZ(*ipp
));
1172 EXPORT_SYMBOL(zfs_lookup
);
1175 * Attempt to create a new entry in a directory. If the entry
1176 * already exists, truncate the file if permissible, else return
1177 * an error. Return the ip of the created or trunc'd file.
1179 * IN: dip - inode of directory to put new file entry in.
1180 * name - name of new file entry.
1181 * vap - attributes of new file.
1182 * excl - flag indicating exclusive or non-exclusive mode.
1183 * mode - mode to open file with.
1184 * cr - credentials of caller.
1185 * flag - large file flag [UNUSED].
1186 * vsecp - ACL to be set
1188 * OUT: ipp - inode of created or trunc'd entry.
1190 * RETURN: 0 if success
1191 * error code if failure
1194 * dip - ctime|mtime updated if new entry created
1195 * ip - ctime|mtime always, atime if new
1200 zfs_create(struct inode
*dip
, char *name
, vattr_t
*vap
, int excl
,
1201 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1203 znode_t
*zp
, *dzp
= ITOZ(dip
);
1204 zfs_sb_t
*zsb
= ITOZSB(dip
);
1212 zfs_acl_ids_t acl_ids
;
1213 boolean_t fuid_dirtied
;
1214 boolean_t have_acl
= B_FALSE
;
1217 * If we have an ephemeral id, ACL, or XVATTR then
1218 * make sure file system is at proper version
1224 if (zsb
->z_use_fuids
== B_FALSE
&&
1225 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1233 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
1234 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1239 if (vap
->va_mask
& ATTR_XVATTR
) {
1240 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1241 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1249 if (*name
== '\0') {
1251 * Null component name refers to the directory itself.
1258 /* possible igrab(zp) */
1261 if (flag
& FIGNORECASE
)
1264 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1268 zfs_acl_ids_free(&acl_ids
);
1269 if (strcmp(name
, "..") == 0)
1280 * Create a new file object and update the directory
1283 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1285 zfs_acl_ids_free(&acl_ids
);
1290 * We only support the creation of regular files in
1291 * extended attribute directories.
1294 if ((dzp
->z_pflags
& ZFS_XATTR
) && !S_ISREG(vap
->va_mode
)) {
1296 zfs_acl_ids_free(&acl_ids
);
1301 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1302 cr
, vsecp
, &acl_ids
)) != 0)
1306 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1307 zfs_acl_ids_free(&acl_ids
);
1312 tx
= dmu_tx_create(os
);
1314 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1315 ZFS_SA_BASE_ATTR_SIZE
);
1317 fuid_dirtied
= zsb
->z_fuid_dirty
;
1319 zfs_fuid_txhold(zsb
, tx
);
1320 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
1321 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
1322 if (!zsb
->z_use_sa
&&
1323 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1324 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1325 0, acl_ids
.z_aclp
->z_acl_bytes
);
1327 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1329 zfs_dirent_unlock(dl
);
1330 if (error
== ERESTART
) {
1335 zfs_acl_ids_free(&acl_ids
);
1340 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1343 zfs_fuid_sync(zsb
, tx
);
1345 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1346 txtype
= zfs_log_create_txtype(Z_FILE
, vsecp
, vap
);
1347 if (flag
& FIGNORECASE
)
1349 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, name
,
1350 vsecp
, acl_ids
.z_fuidp
, vap
);
1351 zfs_acl_ids_free(&acl_ids
);
1354 int aflags
= (flag
& FAPPEND
) ? V_APPEND
: 0;
1357 zfs_acl_ids_free(&acl_ids
);
1361 * A directory entry already exists for this name.
1364 * Can't truncate an existing file if in exclusive mode.
1371 * Can't open a directory for writing.
1373 if (S_ISDIR(ZTOI(zp
)->i_mode
)) {
1378 * Verify requested access to file.
1380 if (mode
&& (error
= zfs_zaccess_rwx(zp
, mode
, aflags
, cr
))) {
1384 mutex_enter(&dzp
->z_lock
);
1386 mutex_exit(&dzp
->z_lock
);
1389 * Truncate regular files if requested.
1391 if (S_ISREG(ZTOI(zp
)->i_mode
) &&
1392 (vap
->va_mask
& ATTR_SIZE
) && (vap
->va_size
== 0)) {
1393 /* we can't hold any locks when calling zfs_freesp() */
1394 zfs_dirent_unlock(dl
);
1396 error
= zfs_freesp(zp
, 0, 0, mode
, TRUE
);
1402 zfs_dirent_unlock(dl
);
1408 zfs_inode_update(dzp
);
1409 zfs_inode_update(zp
);
1413 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1414 zil_commit(zilog
, 0);
1419 EXPORT_SYMBOL(zfs_create
);
1422 * Remove an entry from a directory.
1424 * IN: dip - inode of directory to remove entry from.
1425 * name - name of entry to remove.
1426 * cr - credentials of caller.
1428 * RETURN: 0 if success
1429 * error code if failure
1433 * ip - ctime (if nlink > 0)
1436 uint64_t null_xattr
= 0;
1440 zfs_remove(struct inode
*dip
, char *name
, cred_t
*cr
)
1442 znode_t
*zp
, *dzp
= ITOZ(dip
);
1445 zfs_sb_t
*zsb
= ITOZSB(dip
);
1448 uint64_t xattr_obj_unlinked
= 0;
1454 pathname_t
*realnmp
= NULL
;
1455 #ifdef HAVE_PN_UTILS
1457 #endif /* HAVE_PN_UTILS */
1465 #ifdef HAVE_PN_UTILS
1466 if (flags
& FIGNORECASE
) {
1471 #endif /* HAVE_PN_UTILS */
1477 * Attempt to lock directory; fail if entry doesn't exist.
1479 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1481 #ifdef HAVE_PN_UTILS
1484 #endif /* HAVE_PN_UTILS */
1491 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1496 * Need to use rmdir for removing directories.
1498 if (S_ISDIR(ip
->i_mode
)) {
1505 dnlc_remove(dvp
, realnmp
->pn_buf
);
1507 dnlc_remove(dvp
, name
);
1508 #endif /* HAVE_DNLC */
1511 * We never delete the znode and always place it in the unlinked
1512 * set. The dentry cache will always hold the last reference and
1513 * is responsible for safely freeing the znode.
1516 tx
= dmu_tx_create(zsb
->z_os
);
1517 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1518 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1519 zfs_sa_upgrade_txholds(tx
, zp
);
1520 zfs_sa_upgrade_txholds(tx
, dzp
);
1522 /* are there any extended attributes? */
1523 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1524 &xattr_obj
, sizeof (xattr_obj
));
1525 if (error
== 0 && xattr_obj
) {
1526 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
1528 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1529 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1532 /* charge as an update -- would be nice not to charge at all */
1533 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1535 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1537 zfs_dirent_unlock(dl
);
1541 if (error
== ERESTART
) {
1546 #ifdef HAVE_PN_UTILS
1549 #endif /* HAVE_PN_UTILS */
1556 * Remove the directory entry.
1558 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1567 * Hold z_lock so that we can make sure that the ACL obj
1568 * hasn't changed. Could have been deleted due to
1571 mutex_enter(&zp
->z_lock
);
1572 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1573 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1574 mutex_exit(&zp
->z_lock
);
1575 zfs_unlinked_add(zp
, tx
);
1579 #ifdef HAVE_PN_UTILS
1580 if (flags
& FIGNORECASE
)
1582 #endif /* HAVE_PN_UTILS */
1583 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1587 #ifdef HAVE_PN_UTILS
1590 #endif /* HAVE_PN_UTILS */
1592 zfs_dirent_unlock(dl
);
1593 zfs_inode_update(dzp
);
1594 zfs_inode_update(zp
);
1596 zfs_inode_update(xzp
);
1602 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1603 zil_commit(zilog
, 0);
1608 EXPORT_SYMBOL(zfs_remove
);
1611 * Create a new directory and insert it into dip using the name
1612 * provided. Return a pointer to the inserted directory.
1614 * IN: dip - inode of directory to add subdir to.
1615 * dirname - name of new directory.
1616 * vap - attributes of new directory.
1617 * cr - credentials of caller.
1618 * vsecp - ACL to be set
1620 * OUT: ipp - inode of created directory.
1622 * RETURN: 0 if success
1623 * error code if failure
1626 * dip - ctime|mtime updated
1627 * ipp - ctime|mtime|atime updated
1631 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1632 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1634 znode_t
*zp
, *dzp
= ITOZ(dip
);
1635 zfs_sb_t
*zsb
= ITOZSB(dip
);
1643 gid_t gid
= crgetgid(cr
);
1644 zfs_acl_ids_t acl_ids
;
1645 boolean_t fuid_dirtied
;
1647 ASSERT(S_ISDIR(vap
->va_mode
));
1650 * If we have an ephemeral id, ACL, or XVATTR then
1651 * make sure file system is at proper version
1655 if (zsb
->z_use_fuids
== B_FALSE
&&
1656 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1663 if (dzp
->z_pflags
& ZFS_XATTR
) {
1668 if (zsb
->z_utf8
&& u8_validate(dirname
,
1669 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1673 if (flags
& FIGNORECASE
)
1676 if (vap
->va_mask
& ATTR_XVATTR
) {
1677 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1678 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1684 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1685 vsecp
, &acl_ids
)) != 0) {
1690 * First make sure the new directory doesn't exist.
1692 * Existence is checked first to make sure we don't return
1693 * EACCES instead of EEXIST which can cause some applications
1699 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1701 zfs_acl_ids_free(&acl_ids
);
1706 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1707 zfs_acl_ids_free(&acl_ids
);
1708 zfs_dirent_unlock(dl
);
1713 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1714 zfs_acl_ids_free(&acl_ids
);
1715 zfs_dirent_unlock(dl
);
1721 * Add a new entry to the directory.
1723 tx
= dmu_tx_create(zsb
->z_os
);
1724 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
1725 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
1726 fuid_dirtied
= zsb
->z_fuid_dirty
;
1728 zfs_fuid_txhold(zsb
, tx
);
1729 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1730 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
1731 acl_ids
.z_aclp
->z_acl_bytes
);
1734 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1735 ZFS_SA_BASE_ATTR_SIZE
);
1737 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1739 zfs_dirent_unlock(dl
);
1740 if (error
== ERESTART
) {
1745 zfs_acl_ids_free(&acl_ids
);
1754 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1757 zfs_fuid_sync(zsb
, tx
);
1760 * Now put new name in parent dir.
1762 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1766 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
1767 if (flags
& FIGNORECASE
)
1769 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
1770 acl_ids
.z_fuidp
, vap
);
1772 zfs_acl_ids_free(&acl_ids
);
1776 zfs_dirent_unlock(dl
);
1778 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1779 zil_commit(zilog
, 0);
1781 zfs_inode_update(dzp
);
1782 zfs_inode_update(zp
);
1786 EXPORT_SYMBOL(zfs_mkdir
);
1789 * Remove a directory subdir entry. If the current working
1790 * directory is the same as the subdir to be removed, the
1793 * IN: dip - inode of directory to remove from.
1794 * name - name of directory to be removed.
1795 * cwd - inode of current working directory.
1796 * cr - credentials of caller.
1797 * flags - case flags
1799 * RETURN: 0 if success
1800 * error code if failure
1803 * dip - ctime|mtime updated
1807 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
1810 znode_t
*dzp
= ITOZ(dip
);
1813 zfs_sb_t
*zsb
= ITOZSB(dip
);
1824 if (flags
& FIGNORECASE
)
1830 * Attempt to lock directory; fail if entry doesn't exist.
1832 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1840 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1844 if (!S_ISDIR(ip
->i_mode
)) {
1855 * Grab a lock on the directory to make sure that noone is
1856 * trying to add (or lookup) entries while we are removing it.
1858 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
1861 * Grab a lock on the parent pointer to make sure we play well
1862 * with the treewalk and directory rename code.
1864 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
1866 tx
= dmu_tx_create(zsb
->z_os
);
1867 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1868 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1869 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1870 zfs_sa_upgrade_txholds(tx
, zp
);
1871 zfs_sa_upgrade_txholds(tx
, dzp
);
1872 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1874 rw_exit(&zp
->z_parent_lock
);
1875 rw_exit(&zp
->z_name_lock
);
1876 zfs_dirent_unlock(dl
);
1878 if (error
== ERESTART
) {
1888 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
1891 uint64_t txtype
= TX_RMDIR
;
1892 if (flags
& FIGNORECASE
)
1894 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
1899 rw_exit(&zp
->z_parent_lock
);
1900 rw_exit(&zp
->z_name_lock
);
1902 zfs_dirent_unlock(dl
);
1904 zfs_inode_update(dzp
);
1905 zfs_inode_update(zp
);
1908 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1909 zil_commit(zilog
, 0);
1914 EXPORT_SYMBOL(zfs_rmdir
);
1917 * Read as many directory entries as will fit into the provided
1918 * dirent buffer from the given directory cursor position.
1920 * IN: ip - inode of directory to read.
1921 * dirent - buffer for directory entries.
1923 * OUT: dirent - filler buffer of directory entries.
1925 * RETURN: 0 if success
1926 * error code if failure
1929 * ip - atime updated
1931 * Note that the low 4 bits of the cookie returned by zap is always zero.
1932 * This allows us to use the low range for "special" directory entries:
1933 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
1934 * we use the offset 2 for the '.zfs' directory.
1938 zfs_readdir(struct inode
*ip
, void *dirent
, filldir_t filldir
,
1939 loff_t
*pos
, cred_t
*cr
)
1941 znode_t
*zp
= ITOZ(ip
);
1942 zfs_sb_t
*zsb
= ITOZSB(ip
);
1945 zap_attribute_t zap
;
1955 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
1956 &parent
, sizeof (parent
))) != 0)
1960 * Quit if directory has been removed (posix)
1967 prefetch
= zp
->z_zn_prefetch
;
1970 * Initialize the iterator cursor.
1974 * Start iteration from the beginning of the directory.
1976 zap_cursor_init(&zc
, os
, zp
->z_id
);
1979 * The offset is a serialized cursor.
1981 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, *pos
);
1985 * Transform to file-system independent format
1992 * Special case `.', `..', and `.zfs'.
1995 (void) strcpy(zap
.za_name
, ".");
1996 zap
.za_normalization_conflict
= 0;
1998 } else if (*pos
== 1) {
1999 (void) strcpy(zap
.za_name
, "..");
2000 zap
.za_normalization_conflict
= 0;
2002 } else if (*pos
== 2 && zfs_show_ctldir(zp
)) {
2003 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
2004 zap
.za_normalization_conflict
= 0;
2005 objnum
= ZFSCTL_INO_ROOT
;
2010 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
2011 if (error
== ENOENT
)
2018 * Allow multiple entries provided the first entry is
2019 * the object id. Non-zpl consumers may safely make
2020 * use of the additional space.
2022 * XXX: This should be a feature flag for compatibility
2024 if (zap
.za_integer_length
!= 8 ||
2025 zap
.za_num_integers
== 0) {
2026 cmn_err(CE_WARN
, "zap_readdir: bad directory "
2027 "entry, obj = %lld, offset = %lld, "
2028 "length = %d, num = %lld\n",
2029 (u_longlong_t
)zp
->z_id
,
2031 zap
.za_integer_length
,
2032 (u_longlong_t
)zap
.za_num_integers
);
2037 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
2039 done
= filldir(dirent
, zap
.za_name
, strlen(zap
.za_name
),
2040 zap_cursor_serialize(&zc
), objnum
, 0);
2045 /* Prefetch znode */
2047 dmu_prefetch(os
, objnum
, 0, 0);
2050 if (*pos
> 2 || (*pos
== 2 && !zfs_show_ctldir(zp
))) {
2051 zap_cursor_advance(&zc
);
2052 *pos
= zap_cursor_serialize(&zc
);
2057 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
2060 zap_cursor_fini(&zc
);
2061 if (error
== ENOENT
)
2064 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
2065 zfs_inode_update(zp
);
2072 EXPORT_SYMBOL(zfs_readdir
);
2074 ulong_t zfs_fsync_sync_cnt
= 4;
2077 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2079 znode_t
*zp
= ITOZ(ip
);
2080 zfs_sb_t
*zsb
= ITOZSB(ip
);
2082 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2084 if (zsb
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2087 zil_commit(zsb
->z_log
, zp
->z_id
);
2092 EXPORT_SYMBOL(zfs_fsync
);
2096 * Get the requested file attributes and place them in the provided
2099 * IN: ip - inode of file.
2100 * vap - va_mask identifies requested attributes.
2101 * If ATTR_XVATTR set, then optional attrs are requested
2102 * flags - ATTR_NOACLCHECK (CIFS server context)
2103 * cr - credentials of caller.
2105 * OUT: vap - attribute values.
2107 * RETURN: 0 (always succeeds)
2111 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2113 znode_t
*zp
= ITOZ(ip
);
2114 zfs_sb_t
*zsb
= ITOZSB(ip
);
2117 uint64_t mtime
[2], ctime
[2];
2118 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2119 xoptattr_t
*xoap
= NULL
;
2120 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2121 sa_bulk_attr_t bulk
[2];
2127 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2129 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
2130 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
2132 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2138 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2139 * Also, if we are the owner don't bother, since owner should
2140 * always be allowed to read basic attributes of file.
2142 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2143 (vap
->va_uid
!= crgetuid(cr
))) {
2144 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2152 * Return all attributes. It's cheaper to provide the answer
2153 * than to determine whether we were asked the question.
2156 mutex_enter(&zp
->z_lock
);
2157 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2158 vap
->va_mode
= zp
->z_mode
;
2159 vap
->va_fsid
= ZTOI(zp
)->i_sb
->s_dev
;
2160 vap
->va_nodeid
= zp
->z_id
;
2161 if ((zp
->z_id
== zsb
->z_root
) && zfs_show_ctldir(zp
))
2162 links
= zp
->z_links
+ 1;
2164 links
= zp
->z_links
;
2165 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2166 vap
->va_size
= i_size_read(ip
);
2167 vap
->va_rdev
= ip
->i_rdev
;
2168 vap
->va_seq
= ip
->i_generation
;
2171 * Add in any requested optional attributes and the create time.
2172 * Also set the corresponding bits in the returned attribute bitmap.
2174 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zsb
->z_use_fuids
) {
2175 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2177 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2178 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2181 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2182 xoap
->xoa_readonly
=
2183 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2184 XVA_SET_RTN(xvap
, XAT_READONLY
);
2187 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2189 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2190 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2193 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2195 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2196 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2199 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2200 xoap
->xoa_nounlink
=
2201 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2202 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2205 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2206 xoap
->xoa_immutable
=
2207 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2208 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2211 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2212 xoap
->xoa_appendonly
=
2213 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2214 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2217 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2219 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2220 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2223 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2225 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2226 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2229 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2230 xoap
->xoa_av_quarantined
=
2231 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2232 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2235 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2236 xoap
->xoa_av_modified
=
2237 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2238 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2241 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2242 S_ISREG(ip
->i_mode
)) {
2243 zfs_sa_get_scanstamp(zp
, xvap
);
2246 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2249 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zsb
),
2250 times
, sizeof (times
));
2251 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2252 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2255 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2256 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2257 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2259 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2260 xoap
->xoa_generation
= zp
->z_gen
;
2261 XVA_SET_RTN(xvap
, XAT_GEN
);
2264 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2266 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2267 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2270 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2272 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2273 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2277 ZFS_TIME_DECODE(&vap
->va_atime
, zp
->z_atime
);
2278 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2279 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2281 mutex_exit(&zp
->z_lock
);
2283 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2285 if (zp
->z_blksz
== 0) {
2287 * Block size hasn't been set; suggest maximal I/O transfers.
2289 vap
->va_blksize
= zsb
->z_max_blksz
;
2295 EXPORT_SYMBOL(zfs_getattr
);
2298 * Get the basic file attributes and place them in the provided kstat
2299 * structure. The inode is assumed to be the authoritative source
2300 * for most of the attributes. However, the znode currently has the
2301 * authoritative atime, blksize, and block count.
2303 * IN: ip - inode of file.
2305 * OUT: sp - kstat values.
2307 * RETURN: 0 (always succeeds)
2311 zfs_getattr_fast(struct inode
*ip
, struct kstat
*sp
)
2313 znode_t
*zp
= ITOZ(ip
);
2314 zfs_sb_t
*zsb
= ITOZSB(ip
);
2319 mutex_enter(&zp
->z_lock
);
2321 generic_fillattr(ip
, sp
);
2322 ZFS_TIME_DECODE(&sp
->atime
, zp
->z_atime
);
2324 sa_object_size(zp
->z_sa_hdl
, (uint32_t *)&sp
->blksize
, &sp
->blocks
);
2325 if (unlikely(zp
->z_blksz
== 0)) {
2327 * Block size hasn't been set; suggest maximal I/O transfers.
2329 sp
->blksize
= zsb
->z_max_blksz
;
2332 mutex_exit(&zp
->z_lock
);
2338 EXPORT_SYMBOL(zfs_getattr_fast
);
2341 * Set the file attributes to the values contained in the
2344 * IN: ip - inode of file to be modified.
2345 * vap - new attribute values.
2346 * If ATTR_XVATTR set, then optional attrs are being set
2347 * flags - ATTR_UTIME set if non-default time values provided.
2348 * - ATTR_NOACLCHECK (CIFS context only).
2349 * cr - credentials of caller.
2351 * RETURN: 0 if success
2352 * error code if failure
2355 * ip - ctime updated, mtime updated if size changed.
2359 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2361 znode_t
*zp
= ITOZ(ip
);
2362 zfs_sb_t
*zsb
= ITOZSB(ip
);
2366 xvattr_t
*tmpxvattr
;
2367 uint_t mask
= vap
->va_mask
;
2371 uint64_t new_uid
, new_gid
;
2373 uint64_t mtime
[2], ctime
[2];
2375 int need_policy
= FALSE
;
2377 zfs_fuid_info_t
*fuidp
= NULL
;
2378 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2381 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2382 boolean_t fuid_dirtied
= B_FALSE
;
2383 sa_bulk_attr_t
*bulk
, *xattr_bulk
;
2384 int count
= 0, xattr_count
= 0;
2395 * Make sure that if we have ephemeral uid/gid or xvattr specified
2396 * that file system is at proper version level
2399 if (zsb
->z_use_fuids
== B_FALSE
&&
2400 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2401 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2402 (mask
& ATTR_XVATTR
))) {
2407 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2412 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2418 * If this is an xvattr_t, then get a pointer to the structure of
2419 * optional attributes. If this is NULL, then we have a vattr_t.
2421 xoap
= xva_getxoptattr(xvap
);
2423 tmpxvattr
= kmem_alloc(sizeof(xvattr_t
), KM_SLEEP
);
2424 xva_init(tmpxvattr
);
2426 bulk
= kmem_alloc(sizeof(sa_bulk_attr_t
) * 7, KM_SLEEP
);
2427 xattr_bulk
= kmem_alloc(sizeof(sa_bulk_attr_t
) * 7, KM_SLEEP
);
2430 * Immutable files can only alter immutable bit and atime
2432 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2433 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2434 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2439 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2445 * Verify timestamps doesn't overflow 32 bits.
2446 * ZFS can handle large timestamps, but 32bit syscalls can't
2447 * handle times greater than 2039. This check should be removed
2448 * once large timestamps are fully supported.
2450 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2451 if (((mask
& ATTR_ATIME
) && TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2452 ((mask
& ATTR_MTIME
) && TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2462 /* Can this be moved to before the top label? */
2463 if (zfs_is_readonly(zsb
)) {
2469 * First validate permissions
2472 if (mask
& ATTR_SIZE
) {
2473 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2477 truncate_setsize(ip
, vap
->va_size
);
2480 * XXX - Note, we are not providing any open
2481 * mode flags here (like FNDELAY), so we may
2482 * block if there are locks present... this
2483 * should be addressed in openat().
2485 /* XXX - would it be OK to generate a log record here? */
2486 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2491 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2492 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2493 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2494 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2495 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2496 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2497 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2498 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2499 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2503 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2504 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2509 * NOTE: even if a new mode is being set,
2510 * we may clear S_ISUID/S_ISGID bits.
2513 if (!(mask
& ATTR_MODE
))
2514 vap
->va_mode
= zp
->z_mode
;
2517 * Take ownership or chgrp to group we are a member of
2520 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2521 take_group
= (mask
& ATTR_GID
) &&
2522 zfs_groupmember(zsb
, vap
->va_gid
, cr
);
2525 * If both ATTR_UID and ATTR_GID are set then take_owner and
2526 * take_group must both be set in order to allow taking
2529 * Otherwise, send the check through secpolicy_vnode_setattr()
2533 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2534 take_owner
&& take_group
) ||
2535 ((idmask
== ATTR_UID
) && take_owner
) ||
2536 ((idmask
== ATTR_GID
) && take_group
)) {
2537 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2538 skipaclchk
, cr
) == 0) {
2540 * Remove setuid/setgid for non-privileged users
2542 (void) secpolicy_setid_clear(vap
, cr
);
2543 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2552 mutex_enter(&zp
->z_lock
);
2553 oldva
.va_mode
= zp
->z_mode
;
2554 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2555 if (mask
& ATTR_XVATTR
) {
2557 * Update xvattr mask to include only those attributes
2558 * that are actually changing.
2560 * the bits will be restored prior to actually setting
2561 * the attributes so the caller thinks they were set.
2563 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2564 if (xoap
->xoa_appendonly
!=
2565 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2568 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2569 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2573 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2574 if (xoap
->xoa_nounlink
!=
2575 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2578 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2579 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2583 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2584 if (xoap
->xoa_immutable
!=
2585 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2588 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2589 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2593 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2594 if (xoap
->xoa_nodump
!=
2595 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2598 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2599 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2603 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2604 if (xoap
->xoa_av_modified
!=
2605 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2608 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2609 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2613 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2614 if ((!S_ISREG(ip
->i_mode
) &&
2615 xoap
->xoa_av_quarantined
) ||
2616 xoap
->xoa_av_quarantined
!=
2617 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2620 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2621 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2625 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2626 mutex_exit(&zp
->z_lock
);
2631 if (need_policy
== FALSE
&&
2632 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2633 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2638 mutex_exit(&zp
->z_lock
);
2640 if (mask
& ATTR_MODE
) {
2641 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2642 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2647 trim_mask
|= ATTR_MODE
;
2655 * If trim_mask is set then take ownership
2656 * has been granted or write_acl is present and user
2657 * has the ability to modify mode. In that case remove
2658 * UID|GID and or MODE from mask so that
2659 * secpolicy_vnode_setattr() doesn't revoke it.
2663 saved_mask
= vap
->va_mask
;
2664 vap
->va_mask
&= ~trim_mask
;
2666 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2667 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2672 vap
->va_mask
|= saved_mask
;
2676 * secpolicy_vnode_setattr, or take ownership may have
2679 mask
= vap
->va_mask
;
2681 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2682 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
2683 &xattr_obj
, sizeof (xattr_obj
));
2685 if (err
== 0 && xattr_obj
) {
2686 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
2690 if (mask
& ATTR_UID
) {
2691 new_uid
= zfs_fuid_create(zsb
,
2692 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
2693 if (new_uid
!= zp
->z_uid
&&
2694 zfs_fuid_overquota(zsb
, B_FALSE
, new_uid
)) {
2702 if (mask
& ATTR_GID
) {
2703 new_gid
= zfs_fuid_create(zsb
, (uint64_t)vap
->va_gid
,
2704 cr
, ZFS_GROUP
, &fuidp
);
2705 if (new_gid
!= zp
->z_gid
&&
2706 zfs_fuid_overquota(zsb
, B_TRUE
, new_gid
)) {
2714 tx
= dmu_tx_create(zsb
->z_os
);
2716 if (mask
& ATTR_MODE
) {
2717 uint64_t pmode
= zp
->z_mode
;
2719 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
2721 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
2723 mutex_enter(&zp
->z_lock
);
2724 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
2726 * Are we upgrading ACL from old V0 format
2729 if (zsb
->z_version
>= ZPL_VERSION_FUID
&&
2730 zfs_znode_acl_version(zp
) ==
2731 ZFS_ACL_VERSION_INITIAL
) {
2732 dmu_tx_hold_free(tx
, acl_obj
, 0,
2734 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2735 0, aclp
->z_acl_bytes
);
2737 dmu_tx_hold_write(tx
, acl_obj
, 0,
2740 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
2741 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2742 0, aclp
->z_acl_bytes
);
2744 mutex_exit(&zp
->z_lock
);
2745 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2747 if ((mask
& ATTR_XVATTR
) &&
2748 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2749 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2751 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2755 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
2758 fuid_dirtied
= zsb
->z_fuid_dirty
;
2760 zfs_fuid_txhold(zsb
, tx
);
2762 zfs_sa_upgrade_txholds(tx
, zp
);
2764 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
2766 if (err
== ERESTART
)
2773 * Set each attribute requested.
2774 * We group settings according to the locks they need to acquire.
2776 * Note: you cannot set ctime directly, although it will be
2777 * updated as a side-effect of calling this function.
2781 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2782 mutex_enter(&zp
->z_acl_lock
);
2783 mutex_enter(&zp
->z_lock
);
2785 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
2786 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
2789 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2790 mutex_enter(&attrzp
->z_acl_lock
);
2791 mutex_enter(&attrzp
->z_lock
);
2792 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2793 SA_ZPL_FLAGS(zsb
), NULL
, &attrzp
->z_pflags
,
2794 sizeof (attrzp
->z_pflags
));
2797 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2799 if (mask
& ATTR_UID
) {
2800 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zsb
), NULL
,
2801 &new_uid
, sizeof (new_uid
));
2802 zp
->z_uid
= new_uid
;
2804 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2805 SA_ZPL_UID(zsb
), NULL
, &new_uid
,
2807 attrzp
->z_uid
= new_uid
;
2811 if (mask
& ATTR_GID
) {
2812 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zsb
),
2813 NULL
, &new_gid
, sizeof (new_gid
));
2814 zp
->z_gid
= new_gid
;
2816 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2817 SA_ZPL_GID(zsb
), NULL
, &new_gid
,
2819 attrzp
->z_gid
= new_gid
;
2822 if (!(mask
& ATTR_MODE
)) {
2823 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
),
2824 NULL
, &new_mode
, sizeof (new_mode
));
2825 new_mode
= zp
->z_mode
;
2827 err
= zfs_acl_chown_setattr(zp
);
2830 err
= zfs_acl_chown_setattr(attrzp
);
2835 if (mask
& ATTR_MODE
) {
2836 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
), NULL
,
2837 &new_mode
, sizeof (new_mode
));
2838 zp
->z_mode
= new_mode
;
2839 ASSERT3P(aclp
, !=, NULL
);
2840 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
2842 if (zp
->z_acl_cached
)
2843 zfs_acl_free(zp
->z_acl_cached
);
2844 zp
->z_acl_cached
= aclp
;
2849 if (mask
& ATTR_ATIME
) {
2850 ZFS_TIME_ENCODE(&vap
->va_atime
, zp
->z_atime
);
2851 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
,
2852 &zp
->z_atime
, sizeof (zp
->z_atime
));
2855 if (mask
& ATTR_MTIME
) {
2856 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
2857 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
2858 mtime
, sizeof (mtime
));
2861 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
2862 if (mask
& ATTR_SIZE
&& !(mask
& ATTR_MTIME
)) {
2863 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
2864 NULL
, mtime
, sizeof (mtime
));
2865 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2866 &ctime
, sizeof (ctime
));
2867 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
2869 } else if (mask
!= 0) {
2870 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2871 &ctime
, sizeof (ctime
));
2872 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
2875 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2876 SA_ZPL_CTIME(zsb
), NULL
,
2877 &ctime
, sizeof (ctime
));
2878 zfs_tstamp_update_setup(attrzp
, STATE_CHANGED
,
2879 mtime
, ctime
, B_TRUE
);
2883 * Do this after setting timestamps to prevent timestamp
2884 * update from toggling bit
2887 if (xoap
&& (mask
& ATTR_XVATTR
)) {
2890 * restore trimmed off masks
2891 * so that return masks can be set for caller.
2894 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
2895 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
2897 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
2898 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
2900 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
2901 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
2903 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
2904 XVA_SET_REQ(xvap
, XAT_NODUMP
);
2906 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
2907 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
2909 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
2910 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
2913 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2914 ASSERT(S_ISREG(ip
->i_mode
));
2916 zfs_xvattr_set(zp
, xvap
, tx
);
2920 zfs_fuid_sync(zsb
, tx
);
2923 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
2925 mutex_exit(&zp
->z_lock
);
2926 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2927 mutex_exit(&zp
->z_acl_lock
);
2930 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2931 mutex_exit(&attrzp
->z_acl_lock
);
2932 mutex_exit(&attrzp
->z_lock
);
2935 if (err
== 0 && attrzp
) {
2936 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
2947 zfs_fuid_info_free(fuidp
);
2953 if (err
== ERESTART
)
2956 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
2958 zfs_inode_update(zp
);
2962 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2963 zil_commit(zilog
, 0);
2966 kmem_free(xattr_bulk
, sizeof(sa_bulk_attr_t
) * 7);
2967 kmem_free(bulk
, sizeof(sa_bulk_attr_t
) * 7);
2968 kmem_free(tmpxvattr
, sizeof(xvattr_t
));
2972 EXPORT_SYMBOL(zfs_setattr
);
2974 typedef struct zfs_zlock
{
2975 krwlock_t
*zl_rwlock
; /* lock we acquired */
2976 znode_t
*zl_znode
; /* znode we held */
2977 struct zfs_zlock
*zl_next
; /* next in list */
2981 * Drop locks and release vnodes that were held by zfs_rename_lock().
2984 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
2988 while ((zl
= *zlpp
) != NULL
) {
2989 if (zl
->zl_znode
!= NULL
)
2990 iput(ZTOI(zl
->zl_znode
));
2991 rw_exit(zl
->zl_rwlock
);
2992 *zlpp
= zl
->zl_next
;
2993 kmem_free(zl
, sizeof (*zl
));
2998 * Search back through the directory tree, using the ".." entries.
2999 * Lock each directory in the chain to prevent concurrent renames.
3000 * Fail any attempt to move a directory into one of its own descendants.
3001 * XXX - z_parent_lock can overlap with map or grow locks
3004 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
3008 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
3009 uint64_t oidp
= zp
->z_id
;
3010 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
3011 krw_t rw
= RW_WRITER
;
3014 * First pass write-locks szp and compares to zp->z_id.
3015 * Later passes read-lock zp and compare to zp->z_parent.
3018 if (!rw_tryenter(rwlp
, rw
)) {
3020 * Another thread is renaming in this path.
3021 * Note that if we are a WRITER, we don't have any
3022 * parent_locks held yet.
3024 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
3026 * Drop our locks and restart
3028 zfs_rename_unlock(&zl
);
3032 rwlp
= &szp
->z_parent_lock
;
3037 * Wait for other thread to drop its locks
3043 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
3044 zl
->zl_rwlock
= rwlp
;
3045 zl
->zl_znode
= NULL
;
3046 zl
->zl_next
= *zlpp
;
3049 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
3052 if (oidp
== rootid
) /* We've hit the top */
3055 if (rw
== RW_READER
) { /* i.e. not the first pass */
3056 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
3061 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
3062 &oidp
, sizeof (oidp
));
3063 rwlp
= &zp
->z_parent_lock
;
3066 } while (zp
->z_id
!= sdzp
->z_id
);
3072 * Move an entry from the provided source directory to the target
3073 * directory. Change the entry name as indicated.
3075 * IN: sdip - Source directory containing the "old entry".
3076 * snm - Old entry name.
3077 * tdip - Target directory to contain the "new entry".
3078 * tnm - New entry name.
3079 * cr - credentials of caller.
3080 * flags - case flags
3082 * RETURN: 0 if success
3083 * error code if failure
3086 * sdip,tdip - ctime|mtime updated
3090 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
3091 cred_t
*cr
, int flags
)
3093 znode_t
*tdzp
, *szp
, *tzp
;
3094 znode_t
*sdzp
= ITOZ(sdip
);
3095 zfs_sb_t
*zsb
= ITOZSB(sdip
);
3097 zfs_dirlock_t
*sdl
, *tdl
;
3100 int cmp
, serr
, terr
;
3105 ZFS_VERIFY_ZP(sdzp
);
3108 if (tdip
->i_sb
!= sdip
->i_sb
) {
3114 ZFS_VERIFY_ZP(tdzp
);
3115 if (zsb
->z_utf8
&& u8_validate(tnm
,
3116 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3121 if (flags
& FIGNORECASE
)
3130 * This is to prevent the creation of links into attribute space
3131 * by renaming a linked file into/outof an attribute directory.
3132 * See the comment in zfs_link() for why this is considered bad.
3134 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3140 * Lock source and target directory entries. To prevent deadlock,
3141 * a lock ordering must be defined. We lock the directory with
3142 * the smallest object id first, or if it's a tie, the one with
3143 * the lexically first name.
3145 if (sdzp
->z_id
< tdzp
->z_id
) {
3147 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3151 * First compare the two name arguments without
3152 * considering any case folding.
3154 int nofold
= (zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3156 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3157 ASSERT(error
== 0 || !zsb
->z_utf8
);
3160 * POSIX: "If the old argument and the new argument
3161 * both refer to links to the same existing file,
3162 * the rename() function shall return successfully
3163 * and perform no other action."
3169 * If the file system is case-folding, then we may
3170 * have some more checking to do. A case-folding file
3171 * system is either supporting mixed case sensitivity
3172 * access or is completely case-insensitive. Note
3173 * that the file system is always case preserving.
3175 * In mixed sensitivity mode case sensitive behavior
3176 * is the default. FIGNORECASE must be used to
3177 * explicitly request case insensitive behavior.
3179 * If the source and target names provided differ only
3180 * by case (e.g., a request to rename 'tim' to 'Tim'),
3181 * we will treat this as a special case in the
3182 * case-insensitive mode: as long as the source name
3183 * is an exact match, we will allow this to proceed as
3184 * a name-change request.
3186 if ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
||
3187 (zsb
->z_case
== ZFS_CASE_MIXED
&&
3188 flags
& FIGNORECASE
)) &&
3189 u8_strcmp(snm
, tnm
, 0, zsb
->z_norm
, U8_UNICODE_LATEST
,
3192 * case preserving rename request, require exact
3201 * If the source and destination directories are the same, we should
3202 * grab the z_name_lock of that directory only once.
3206 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3210 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3211 ZEXISTS
| zflg
, NULL
, NULL
);
3212 terr
= zfs_dirent_lock(&tdl
,
3213 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3215 terr
= zfs_dirent_lock(&tdl
,
3216 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3217 serr
= zfs_dirent_lock(&sdl
,
3218 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3224 * Source entry invalid or not there.
3227 zfs_dirent_unlock(tdl
);
3233 rw_exit(&sdzp
->z_name_lock
);
3235 if (strcmp(snm
, "..") == 0)
3241 zfs_dirent_unlock(sdl
);
3245 rw_exit(&sdzp
->z_name_lock
);
3247 if (strcmp(tnm
, "..") == 0)
3254 * Must have write access at the source to remove the old entry
3255 * and write access at the target to create the new entry.
3256 * Note that if target and source are the same, this can be
3257 * done in a single check.
3260 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3263 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3265 * Check to make sure rename is valid.
3266 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3268 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3273 * Does target exist?
3277 * Source and target must be the same type.
3279 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3280 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3285 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3291 * POSIX dictates that when the source and target
3292 * entries refer to the same file object, rename
3293 * must do nothing and exit without error.
3295 if (szp
->z_id
== tzp
->z_id
) {
3301 tx
= dmu_tx_create(zsb
->z_os
);
3302 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3303 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3304 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3305 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3307 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3308 zfs_sa_upgrade_txholds(tx
, tdzp
);
3311 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3312 zfs_sa_upgrade_txholds(tx
, tzp
);
3315 zfs_sa_upgrade_txholds(tx
, szp
);
3316 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
3317 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3320 zfs_rename_unlock(&zl
);
3321 zfs_dirent_unlock(sdl
);
3322 zfs_dirent_unlock(tdl
);
3325 rw_exit(&sdzp
->z_name_lock
);
3330 if (error
== ERESTART
) {
3340 if (tzp
) /* Attempt to remove the existing target */
3341 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3344 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3346 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3348 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zsb
),
3349 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3352 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3354 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3355 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3356 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3359 * At this point, we have successfully created
3360 * the target name, but have failed to remove
3361 * the source name. Since the create was done
3362 * with the ZRENAMING flag, there are
3363 * complications; for one, the link count is
3364 * wrong. The easiest way to deal with this
3365 * is to remove the newly created target, and
3366 * return the original error. This must
3367 * succeed; fortunately, it is very unlikely to
3368 * fail, since we just created it.
3370 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3371 ZRENAMING
, NULL
), ==, 0);
3379 zfs_rename_unlock(&zl
);
3381 zfs_dirent_unlock(sdl
);
3382 zfs_dirent_unlock(tdl
);
3384 zfs_inode_update(sdzp
);
3386 rw_exit(&sdzp
->z_name_lock
);
3389 zfs_inode_update(tdzp
);
3391 zfs_inode_update(szp
);
3394 zfs_inode_update(tzp
);
3398 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3399 zil_commit(zilog
, 0);
3404 EXPORT_SYMBOL(zfs_rename
);
3407 * Insert the indicated symbolic reference entry into the directory.
3409 * IN: dip - Directory to contain new symbolic link.
3410 * link - Name for new symlink entry.
3411 * vap - Attributes of new entry.
3412 * target - Target path of new symlink.
3414 * cr - credentials of caller.
3415 * flags - case flags
3417 * RETURN: 0 if success
3418 * error code if failure
3421 * dip - ctime|mtime updated
3425 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3426 struct inode
**ipp
, cred_t
*cr
, int flags
)
3428 znode_t
*zp
, *dzp
= ITOZ(dip
);
3431 zfs_sb_t
*zsb
= ITOZSB(dip
);
3433 uint64_t len
= strlen(link
);
3436 zfs_acl_ids_t acl_ids
;
3437 boolean_t fuid_dirtied
;
3438 uint64_t txtype
= TX_SYMLINK
;
3440 ASSERT(S_ISLNK(vap
->va_mode
));
3446 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
3447 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3451 if (flags
& FIGNORECASE
)
3454 if (len
> MAXPATHLEN
) {
3456 return (ENAMETOOLONG
);
3459 if ((error
= zfs_acl_ids_create(dzp
, 0,
3460 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3468 * Attempt to lock directory; fail if entry already exists.
3470 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3472 zfs_acl_ids_free(&acl_ids
);
3477 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3478 zfs_acl_ids_free(&acl_ids
);
3479 zfs_dirent_unlock(dl
);
3484 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
3485 zfs_acl_ids_free(&acl_ids
);
3486 zfs_dirent_unlock(dl
);
3490 tx
= dmu_tx_create(zsb
->z_os
);
3491 fuid_dirtied
= zsb
->z_fuid_dirty
;
3492 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3493 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3494 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3495 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3496 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3497 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3498 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3499 acl_ids
.z_aclp
->z_acl_bytes
);
3502 zfs_fuid_txhold(zsb
, tx
);
3503 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3505 zfs_dirent_unlock(dl
);
3506 if (error
== ERESTART
) {
3511 zfs_acl_ids_free(&acl_ids
);
3518 * Create a new object for the symlink.
3519 * for version 4 ZPL datsets the symlink will be an SA attribute
3521 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3524 zfs_fuid_sync(zsb
, tx
);
3526 mutex_enter(&zp
->z_lock
);
3528 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zsb
),
3531 zfs_sa_symlink(zp
, link
, len
, tx
);
3532 mutex_exit(&zp
->z_lock
);
3535 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
3536 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3538 * Insert the new object into the directory.
3540 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3542 if (flags
& FIGNORECASE
)
3544 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3546 zfs_inode_update(dzp
);
3547 zfs_inode_update(zp
);
3549 zfs_acl_ids_free(&acl_ids
);
3553 zfs_dirent_unlock(dl
);
3557 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3558 zil_commit(zilog
, 0);
3563 EXPORT_SYMBOL(zfs_symlink
);
3566 * Return, in the buffer contained in the provided uio structure,
3567 * the symbolic path referred to by ip.
3569 * IN: ip - inode of symbolic link
3570 * uio - structure to contain the link path.
3571 * cr - credentials of caller.
3573 * RETURN: 0 if success
3574 * error code if failure
3577 * ip - atime updated
3581 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3583 znode_t
*zp
= ITOZ(ip
);
3584 zfs_sb_t
*zsb
= ITOZSB(ip
);
3590 mutex_enter(&zp
->z_lock
);
3592 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3593 SA_ZPL_SYMLINK(zsb
), uio
);
3595 error
= zfs_sa_readlink(zp
, uio
);
3596 mutex_exit(&zp
->z_lock
);
3598 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
3599 zfs_inode_update(zp
);
3603 EXPORT_SYMBOL(zfs_readlink
);
3606 * Insert a new entry into directory tdip referencing sip.
3608 * IN: tdip - Directory to contain new entry.
3609 * sip - inode of new entry.
3610 * name - name of new entry.
3611 * cr - credentials of caller.
3613 * RETURN: 0 if success
3614 * error code if failure
3617 * tdip - ctime|mtime updated
3618 * sip - ctime updated
3622 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
)
3624 znode_t
*dzp
= ITOZ(tdip
);
3626 zfs_sb_t
*zsb
= ITOZSB(tdip
);
3635 ASSERT(S_ISDIR(tdip
->i_mode
));
3642 * POSIX dictates that we return EPERM here.
3643 * Better choices include ENOTSUP or EISDIR.
3645 if (S_ISDIR(sip
->i_mode
)) {
3650 if (sip
->i_sb
!= tdip
->i_sb
) {
3658 /* Prevent links to .zfs/shares files */
3660 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
3661 &parent
, sizeof (uint64_t))) != 0) {
3665 if (parent
== zsb
->z_shares_dir
) {
3670 if (zsb
->z_utf8
&& u8_validate(name
,
3671 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3675 #ifdef HAVE_PN_UTILS
3676 if (flags
& FIGNORECASE
)
3678 #endif /* HAVE_PN_UTILS */
3681 * We do not support links between attributes and non-attributes
3682 * because of the potential security risk of creating links
3683 * into "normal" file space in order to circumvent restrictions
3684 * imposed in attribute space.
3686 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
3691 owner
= zfs_fuid_map_id(zsb
, szp
->z_uid
, cr
, ZFS_OWNER
);
3692 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
3697 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3704 * Attempt to lock directory; fail if entry already exists.
3706 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
3712 tx
= dmu_tx_create(zsb
->z_os
);
3713 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3714 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3715 zfs_sa_upgrade_txholds(tx
, szp
);
3716 zfs_sa_upgrade_txholds(tx
, dzp
);
3717 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3719 zfs_dirent_unlock(dl
);
3720 if (error
== ERESTART
) {
3730 error
= zfs_link_create(dl
, szp
, tx
, 0);
3733 uint64_t txtype
= TX_LINK
;
3734 #ifdef HAVE_PN_UTILS
3735 if (flags
& FIGNORECASE
)
3737 #endif /* HAVE_PN_UTILS */
3738 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
3743 zfs_dirent_unlock(dl
);
3745 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3746 zil_commit(zilog
, 0);
3748 zfs_inode_update(dzp
);
3749 zfs_inode_update(szp
);
3753 EXPORT_SYMBOL(zfs_link
);
3756 zfs_putpage_commit_cb(void *arg
, int error
)
3758 struct page
*pp
= arg
;
3761 __set_page_dirty_nobuffers(pp
);
3763 if (error
!= ECANCELED
)
3769 end_page_writeback(pp
);
3773 * Push a page out to disk, once the page is on stable storage the
3774 * registered commit callback will be run as notification of completion.
3776 * IN: ip - page mapped for inode.
3777 * pp - page to push (page is locked)
3778 * wbc - writeback control data
3780 * RETURN: 0 if success
3781 * error code if failure
3784 * ip - ctime|mtime updated
3788 zfs_putpage(struct inode
*ip
, struct page
*pp
, struct writeback_control
*wbc
)
3790 znode_t
*zp
= ITOZ(ip
);
3791 zfs_sb_t
*zsb
= ITOZSB(ip
);
3799 uint64_t mtime
[2], ctime
[2];
3800 sa_bulk_attr_t bulk
[3];
3807 ASSERT(PageLocked(pp
));
3809 pgoff
= page_offset(pp
); /* Page byte-offset in file */
3810 offset
= i_size_read(ip
); /* File length in bytes */
3811 pglen
= MIN(PAGE_CACHE_SIZE
, /* Page length in bytes */
3812 P2ROUNDUP(offset
, PAGE_CACHE_SIZE
)-pgoff
);
3814 /* Page is beyond end of file */
3815 if (pgoff
>= offset
) {
3821 /* Truncate page length to end of file */
3822 if (pgoff
+ pglen
> offset
)
3823 pglen
= offset
- pgoff
;
3827 * FIXME: Allow mmap writes past its quota. The correct fix
3828 * is to register a page_mkwrite() handler to count the page
3829 * against its quota when it is about to be dirtied.
3831 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
3832 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
3837 set_page_writeback(pp
);
3840 rl
= zfs_range_lock(zp
, pgoff
, pglen
, RL_WRITER
);
3841 tx
= dmu_tx_create(zsb
->z_os
);
3843 sync
= ((zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
) ||
3844 (wbc
->sync_mode
== WB_SYNC_ALL
));
3846 dmu_tx_callback_register(tx
, zfs_putpage_commit_cb
, pp
);
3848 dmu_tx_hold_write(tx
, zp
->z_id
, pgoff
, pglen
);
3850 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3851 zfs_sa_upgrade_txholds(tx
, zp
);
3852 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3854 if (err
== ERESTART
)
3857 /* Will call all registered commit callbacks */
3861 * For the synchronous case the commit callback must be
3862 * explicitly called because there is no registered callback.
3865 zfs_putpage_commit_cb(pp
, ECANCELED
);
3867 zfs_range_unlock(rl
);
3873 ASSERT3U(pglen
, <=, PAGE_CACHE_SIZE
);
3874 dmu_write(zsb
->z_os
, zp
->z_id
, pgoff
, pglen
, va
, tx
);
3877 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
3878 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
3879 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_FLAGS(zsb
), NULL
, &zp
->z_pflags
, 8);
3881 /* Preserve the mtime and ctime provided by the inode */
3882 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
3883 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
3884 zp
->z_atime_dirty
= 0;
3887 err
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
3889 zfs_log_write(zsb
->z_log
, tx
, TX_WRITE
, zp
, pgoff
, pglen
, 0);
3892 zfs_range_unlock(rl
);
3895 zil_commit(zsb
->z_log
, zp
->z_id
);
3896 zfs_putpage_commit_cb(pp
, err
);
3904 * Update the system attributes when the inode has been dirtied. For the
3905 * moment we're conservative and only update the atime, mtime, and ctime.
3908 zfs_dirty_inode(struct inode
*ip
, int flags
)
3910 znode_t
*zp
= ITOZ(ip
);
3911 zfs_sb_t
*zsb
= ITOZSB(ip
);
3913 uint64_t atime
[2], mtime
[2], ctime
[2];
3914 sa_bulk_attr_t bulk
[3];
3921 tx
= dmu_tx_create(zsb
->z_os
);
3923 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3924 zfs_sa_upgrade_txholds(tx
, zp
);
3926 error
= dmu_tx_assign(tx
, TXG_WAIT
);
3932 mutex_enter(&zp
->z_lock
);
3933 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_ATIME(zsb
), NULL
, &atime
, 16);
3934 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
3935 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
3937 /* Preserve the mtime and ctime provided by the inode */
3938 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
3939 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
3940 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
3941 zp
->z_atime_dirty
= 0;
3943 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
3944 mutex_exit(&zp
->z_lock
);
3951 EXPORT_SYMBOL(zfs_dirty_inode
);
3955 zfs_inactive(struct inode
*ip
)
3957 znode_t
*zp
= ITOZ(ip
);
3958 zfs_sb_t
*zsb
= ITOZSB(ip
);
3961 if (zfsctl_is_node(ip
)) {
3962 zfsctl_inode_inactive(ip
);
3966 rw_enter(&zsb
->z_teardown_inactive_lock
, RW_READER
);
3967 if (zp
->z_sa_hdl
== NULL
) {
3968 rw_exit(&zsb
->z_teardown_inactive_lock
);
3972 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
3973 dmu_tx_t
*tx
= dmu_tx_create(zsb
->z_os
);
3975 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3976 zfs_sa_upgrade_txholds(tx
, zp
);
3977 error
= dmu_tx_assign(tx
, TXG_WAIT
);
3981 mutex_enter(&zp
->z_lock
);
3982 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zsb
),
3983 (void *)&zp
->z_atime
, sizeof (zp
->z_atime
), tx
);
3984 zp
->z_atime_dirty
= 0;
3985 mutex_exit(&zp
->z_lock
);
3991 rw_exit(&zsb
->z_teardown_inactive_lock
);
3993 EXPORT_SYMBOL(zfs_inactive
);
3996 * Bounds-check the seek operation.
3998 * IN: ip - inode seeking within
3999 * ooff - old file offset
4000 * noffp - pointer to new file offset
4001 * ct - caller context
4003 * RETURN: 0 if success
4004 * EINVAL if new offset invalid
4008 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
4010 if (S_ISDIR(ip
->i_mode
))
4012 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
4014 EXPORT_SYMBOL(zfs_seek
);
4017 * Fill pages with data from the disk.
4020 zfs_fillpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4022 znode_t
*zp
= ITOZ(ip
);
4023 zfs_sb_t
*zsb
= ITOZSB(ip
);
4025 struct page
*cur_pp
;
4026 u_offset_t io_off
, total
;
4033 io_len
= nr_pages
<< PAGE_CACHE_SHIFT
;
4034 i_size
= i_size_read(ip
);
4035 io_off
= page_offset(pl
[0]);
4037 if (io_off
+ io_len
> i_size
)
4038 io_len
= i_size
- io_off
;
4041 * Iterate over list of pages and read each page individually.
4045 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
4049 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
4053 /* convert checksum errors into IO errors */
4058 cur_pp
= pl
[++page_idx
];
4065 * Uses zfs_fillpage to read data from the file and fill the pages.
4067 * IN: ip - inode of file to get data from.
4068 * pl - list of pages to read
4069 * nr_pages - number of pages to read
4071 * RETURN: 0 if success
4072 * error code if failure
4075 * vp - atime updated
4079 zfs_getpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4081 znode_t
*zp
= ITOZ(ip
);
4082 zfs_sb_t
*zsb
= ITOZSB(ip
);
4091 err
= zfs_fillpage(ip
, pl
, nr_pages
);
4094 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
4099 EXPORT_SYMBOL(zfs_getpage
);
4102 * Check ZFS specific permissions to memory map a section of a file.
4104 * IN: ip - inode of the file to mmap
4106 * addrp - start address in memory region
4107 * len - length of memory region
4108 * vm_flags- address flags
4110 * RETURN: 0 if success
4111 * error code if failure
4115 zfs_map(struct inode
*ip
, offset_t off
, caddr_t
*addrp
, size_t len
,
4116 unsigned long vm_flags
)
4118 znode_t
*zp
= ITOZ(ip
);
4119 zfs_sb_t
*zsb
= ITOZSB(ip
);
4124 if ((vm_flags
& VM_WRITE
) && (zp
->z_pflags
&
4125 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4130 if ((vm_flags
& (VM_READ
| VM_EXEC
)) &&
4131 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4136 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4144 EXPORT_SYMBOL(zfs_map
);
4147 * convoff - converts the given data (start, whence) to the
4151 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4156 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4157 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4161 switch (lckdat
->l_whence
) {
4163 lckdat
->l_start
+= offset
;
4166 lckdat
->l_start
+= vap
.va_size
;
4174 if (lckdat
->l_start
< 0)
4179 lckdat
->l_start
-= offset
;
4182 lckdat
->l_start
-= vap
.va_size
;
4190 lckdat
->l_whence
= (short)whence
;
4195 * Free or allocate space in a file. Currently, this function only
4196 * supports the `F_FREESP' command. However, this command is somewhat
4197 * misnamed, as its functionality includes the ability to allocate as
4198 * well as free space.
4200 * IN: ip - inode of file to free data in.
4201 * cmd - action to take (only F_FREESP supported).
4202 * bfp - section of file to free/alloc.
4203 * flag - current file open mode flags.
4204 * offset - current file offset.
4205 * cr - credentials of caller [UNUSED].
4207 * RETURN: 0 if success
4208 * error code if failure
4211 * ip - ctime|mtime updated
4215 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4216 offset_t offset
, cred_t
*cr
)
4218 znode_t
*zp
= ITOZ(ip
);
4219 zfs_sb_t
*zsb
= ITOZSB(ip
);
4226 if (cmd
!= F_FREESP
) {
4231 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4236 if (bfp
->l_len
< 0) {
4242 * Permissions aren't checked on Solaris because on this OS
4243 * zfs_space() can only be called with an opened file handle.
4244 * On Linux we can get here through truncate_range() which
4245 * operates directly on inodes, so we need to check access rights.
4247 if ((error
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
))) {
4253 len
= bfp
->l_len
; /* 0 means from off to end of file */
4255 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4260 EXPORT_SYMBOL(zfs_space
);
4264 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4266 znode_t
*zp
= ITOZ(ip
);
4267 zfs_sb_t
*zsb
= ITOZSB(ip
);
4270 uint64_t object
= zp
->z_id
;
4277 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zsb
),
4278 &gen64
, sizeof (uint64_t))) != 0) {
4283 gen
= (uint32_t)gen64
;
4285 size
= (zsb
->z_parent
!= zsb
) ? LONG_FID_LEN
: SHORT_FID_LEN
;
4286 if (fidp
->fid_len
< size
) {
4287 fidp
->fid_len
= size
;
4292 zfid
= (zfid_short_t
*)fidp
;
4294 zfid
->zf_len
= size
;
4296 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4297 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4299 /* Must have a non-zero generation number to distinguish from .zfs */
4302 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4303 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4305 if (size
== LONG_FID_LEN
) {
4306 uint64_t objsetid
= dmu_objset_id(zsb
->z_os
);
4309 zlfid
= (zfid_long_t
*)fidp
;
4311 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
4312 zlfid
->zf_setid
[i
] = (uint8_t)(objsetid
>> (8 * i
));
4314 /* XXX - this should be the generation number for the objset */
4315 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
4316 zlfid
->zf_setgen
[i
] = 0;
4322 EXPORT_SYMBOL(zfs_fid
);
4326 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4328 znode_t
*zp
= ITOZ(ip
);
4329 zfs_sb_t
*zsb
= ITOZSB(ip
);
4331 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4335 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4340 EXPORT_SYMBOL(zfs_getsecattr
);
4344 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4346 znode_t
*zp
= ITOZ(ip
);
4347 zfs_sb_t
*zsb
= ITOZSB(ip
);
4349 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4350 zilog_t
*zilog
= zsb
->z_log
;
4355 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4357 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4358 zil_commit(zilog
, 0);
4363 EXPORT_SYMBOL(zfs_setsecattr
);
4365 #ifdef HAVE_UIO_ZEROCOPY
4367 * Tunable, both must be a power of 2.
4369 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4370 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4371 * an arcbuf for a partial block read
4373 int zcr_blksz_min
= (1 << 10); /* 1K */
4374 int zcr_blksz_max
= (1 << 17); /* 128K */
4378 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4380 znode_t
*zp
= ITOZ(ip
);
4381 zfs_sb_t
*zsb
= ITOZSB(ip
);
4382 int max_blksz
= zsb
->z_max_blksz
;
4383 uio_t
*uio
= &xuio
->xu_uio
;
4384 ssize_t size
= uio
->uio_resid
;
4385 offset_t offset
= uio
->uio_loffset
;
4390 int preamble
, postamble
;
4392 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4400 * Loan out an arc_buf for write if write size is bigger than
4401 * max_blksz, and the file's block size is also max_blksz.
4404 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4409 * Caller requests buffers for write before knowing where the
4410 * write offset might be (e.g. NFS TCP write).
4415 preamble
= P2PHASE(offset
, blksz
);
4417 preamble
= blksz
- preamble
;
4422 postamble
= P2PHASE(size
, blksz
);
4425 fullblk
= size
/ blksz
;
4426 (void) dmu_xuio_init(xuio
,
4427 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4430 * Have to fix iov base/len for partial buffers. They
4431 * currently represent full arc_buf's.
4434 /* data begins in the middle of the arc_buf */
4435 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4438 (void) dmu_xuio_add(xuio
, abuf
,
4439 blksz
- preamble
, preamble
);
4442 for (i
= 0; i
< fullblk
; i
++) {
4443 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4446 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4450 /* data ends in the middle of the arc_buf */
4451 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4454 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4459 * Loan out an arc_buf for read if the read size is larger than
4460 * the current file block size. Block alignment is not
4461 * considered. Partial arc_buf will be loaned out for read.
4463 blksz
= zp
->z_blksz
;
4464 if (blksz
< zcr_blksz_min
)
4465 blksz
= zcr_blksz_min
;
4466 if (blksz
> zcr_blksz_max
)
4467 blksz
= zcr_blksz_max
;
4468 /* avoid potential complexity of dealing with it */
4469 if (blksz
> max_blksz
) {
4474 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4488 uio
->uio_extflg
= UIO_XUIO
;
4489 XUIO_XUZC_RW(xuio
) = ioflag
;
4496 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4500 int ioflag
= XUIO_XUZC_RW(xuio
);
4502 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4504 i
= dmu_xuio_cnt(xuio
);
4506 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4508 * if abuf == NULL, it must be a write buffer
4509 * that has been returned in zfs_write().
4512 dmu_return_arcbuf(abuf
);
4513 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4516 dmu_xuio_fini(xuio
);
4519 #endif /* HAVE_UIO_ZEROCOPY */
4521 #if defined(_KERNEL) && defined(HAVE_SPL)
4522 module_param(zfs_read_chunk_size
, long, 0644);
4523 MODULE_PARM_DESC(zfs_read_chunk_size
, "Bytes to read per chunk");