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, 2015 by Delphix. All rights reserved.
24 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2015 by Chunwei Chen. All rights reserved.
28 /* Portions Copyright 2007 Jeremy Teo */
29 /* Portions Copyright 2010 Robert Milkowski */
32 #include <sys/types.h>
33 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/sysmacros.h>
37 #include <sys/resource.h>
39 #include <sys/vfs_opreg.h>
43 #include <sys/taskq.h>
45 #include <sys/vmsystm.h>
46 #include <sys/atomic.h>
48 #include <sys/pathname.h>
49 #include <sys/cmn_err.h>
50 #include <sys/errno.h>
51 #include <sys/unistd.h>
52 #include <sys/zfs_dir.h>
53 #include <sys/zfs_acl.h>
54 #include <sys/zfs_ioctl.h>
55 #include <sys/fs/zfs.h>
57 #include <sys/dmu_objset.h>
63 #include <sys/dirent.h>
64 #include <sys/policy.h>
65 #include <sys/sunddi.h>
68 #include "fs/fs_subr.h"
69 #include <sys/zfs_ctldir.h>
70 #include <sys/zfs_fuid.h>
71 #include <sys/zfs_sa.h>
72 #include <sys/zfs_vnops.h>
74 #include <sys/zfs_rlock.h>
75 #include <sys/extdirent.h>
76 #include <sys/kidmap.h>
84 * Each vnode op performs some logical unit of work. To do this, the ZPL must
85 * properly lock its in-core state, create a DMU transaction, do the work,
86 * record this work in the intent log (ZIL), commit the DMU transaction,
87 * and wait for the intent log to commit if it is a synchronous operation.
88 * Moreover, the vnode ops must work in both normal and log replay context.
89 * The ordering of events is important to avoid deadlocks and references
90 * to freed memory. The example below illustrates the following Big Rules:
92 * (1) A check must be made in each zfs thread for a mounted file system.
93 * This is done avoiding races using ZFS_ENTER(zsb).
94 * A ZFS_EXIT(zsb) is needed before all returns. Any znodes
95 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
96 * can return EIO from the calling function.
98 * (2) iput() should always be the last thing except for zil_commit()
99 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
100 * First, if it's the last reference, the vnode/znode
101 * can be freed, so the zp may point to freed memory. Second, the last
102 * reference will call zfs_zinactive(), which may induce a lot of work --
103 * pushing cached pages (which acquires range locks) and syncing out
104 * cached atime changes. Third, zfs_zinactive() may require a new tx,
105 * which could deadlock the system if you were already holding one.
106 * If you must call iput() within a tx then use zfs_iput_async().
108 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
109 * as they can span dmu_tx_assign() calls.
111 * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
112 * dmu_tx_assign(). This is critical because we don't want to block
113 * while holding locks.
115 * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
116 * reduces lock contention and CPU usage when we must wait (note that if
117 * throughput is constrained by the storage, nearly every transaction
120 * Note, in particular, that if a lock is sometimes acquired before
121 * the tx assigns, and sometimes after (e.g. z_lock), then failing
122 * to use a non-blocking assign can deadlock the system. The scenario:
124 * Thread A has grabbed a lock before calling dmu_tx_assign().
125 * Thread B is in an already-assigned tx, and blocks for this lock.
126 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
127 * forever, because the previous txg can't quiesce until B's tx commits.
129 * If dmu_tx_assign() returns ERESTART and zsb->z_assign is TXG_NOWAIT,
130 * then drop all locks, call dmu_tx_wait(), and try again. On subsequent
131 * calls to dmu_tx_assign(), pass TXG_WAITED rather than TXG_NOWAIT,
132 * to indicate that this operation has already called dmu_tx_wait().
133 * This will ensure that we don't retry forever, waiting a short bit
136 * (5) If the operation succeeded, generate the intent log entry for it
137 * before dropping locks. This ensures that the ordering of events
138 * in the intent log matches the order in which they actually occurred.
139 * During ZIL replay the zfs_log_* functions will update the sequence
140 * number to indicate the zil transaction has replayed.
142 * (6) At the end of each vnode op, the DMU tx must always commit,
143 * regardless of whether there were any errors.
145 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
146 * to ensure that synchronous semantics are provided when necessary.
148 * In general, this is how things should be ordered in each vnode op:
150 * ZFS_ENTER(zsb); // exit if unmounted
152 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
153 * rw_enter(...); // grab any other locks you need
154 * tx = dmu_tx_create(...); // get DMU tx
155 * dmu_tx_hold_*(); // hold each object you might modify
156 * error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
158 * rw_exit(...); // drop locks
159 * zfs_dirent_unlock(dl); // unlock directory entry
160 * iput(...); // release held vnodes
161 * if (error == ERESTART) {
167 * dmu_tx_abort(tx); // abort DMU tx
168 * ZFS_EXIT(zsb); // finished in zfs
169 * return (error); // really out of space
171 * error = do_real_work(); // do whatever this VOP does
173 * zfs_log_*(...); // on success, make ZIL entry
174 * dmu_tx_commit(tx); // commit DMU tx -- error or not
175 * rw_exit(...); // drop locks
176 * zfs_dirent_unlock(dl); // unlock directory entry
177 * iput(...); // release held vnodes
178 * zil_commit(zilog, foid); // synchronous when necessary
179 * ZFS_EXIT(zsb); // finished in zfs
180 * return (error); // done, report error
184 * Virus scanning is unsupported. It would be possible to add a hook
185 * here to performance the required virus scan. This could be done
186 * entirely in the kernel or potentially as an update to invoke a
190 zfs_vscan(struct inode
*ip
, cred_t
*cr
, int async
)
197 zfs_open(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
199 znode_t
*zp
= ITOZ(ip
);
200 zfs_sb_t
*zsb
= ITOZSB(ip
);
205 /* Honor ZFS_APPENDONLY file attribute */
206 if ((mode
& FMODE_WRITE
) && (zp
->z_pflags
& ZFS_APPENDONLY
) &&
207 ((flag
& O_APPEND
) == 0)) {
209 return (SET_ERROR(EPERM
));
212 /* Virus scan eligible files on open */
213 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
214 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0) {
215 if (zfs_vscan(ip
, cr
, 0) != 0) {
217 return (SET_ERROR(EACCES
));
221 /* Keep a count of the synchronous opens in the znode */
223 atomic_inc_32(&zp
->z_sync_cnt
);
228 EXPORT_SYMBOL(zfs_open
);
232 zfs_close(struct inode
*ip
, int flag
, cred_t
*cr
)
234 znode_t
*zp
= ITOZ(ip
);
235 zfs_sb_t
*zsb
= ITOZSB(ip
);
240 /* Decrement the synchronous opens in the znode */
242 atomic_dec_32(&zp
->z_sync_cnt
);
244 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
245 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0)
246 VERIFY(zfs_vscan(ip
, cr
, 1) == 0);
251 EXPORT_SYMBOL(zfs_close
);
253 #if defined(SEEK_HOLE) && defined(SEEK_DATA)
255 * Lseek support for finding holes (cmd == SEEK_HOLE) and
256 * data (cmd == SEEK_DATA). "off" is an in/out parameter.
259 zfs_holey_common(struct inode
*ip
, int cmd
, loff_t
*off
)
261 znode_t
*zp
= ITOZ(ip
);
262 uint64_t noff
= (uint64_t)*off
; /* new offset */
267 file_sz
= zp
->z_size
;
268 if (noff
>= file_sz
) {
269 return (SET_ERROR(ENXIO
));
272 if (cmd
== SEEK_HOLE
)
277 error
= dmu_offset_next(ZTOZSB(zp
)->z_os
, zp
->z_id
, hole
, &noff
);
280 return (SET_ERROR(ENXIO
));
283 * We could find a hole that begins after the logical end-of-file,
284 * because dmu_offset_next() only works on whole blocks. If the
285 * EOF falls mid-block, then indicate that the "virtual hole"
286 * at the end of the file begins at the logical EOF, rather than
287 * at the end of the last block.
289 if (noff
> file_sz
) {
301 zfs_holey(struct inode
*ip
, int cmd
, loff_t
*off
)
303 znode_t
*zp
= ITOZ(ip
);
304 zfs_sb_t
*zsb
= ITOZSB(ip
);
310 error
= zfs_holey_common(ip
, cmd
, off
);
315 EXPORT_SYMBOL(zfs_holey
);
316 #endif /* SEEK_HOLE && SEEK_DATA */
320 * When a file is memory mapped, we must keep the IO data synchronized
321 * between the DMU cache and the memory mapped pages. What this means:
323 * On Write: If we find a memory mapped page, we write to *both*
324 * the page and the dmu buffer.
327 update_pages(struct inode
*ip
, int64_t start
, int len
,
328 objset_t
*os
, uint64_t oid
)
330 struct address_space
*mp
= ip
->i_mapping
;
336 off
= start
& (PAGE_CACHE_SIZE
-1);
337 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
338 nbytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
340 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
342 if (mapping_writably_mapped(mp
))
343 flush_dcache_page(pp
);
346 (void) dmu_read(os
, oid
, start
+off
, nbytes
, pb
+off
,
350 if (mapping_writably_mapped(mp
))
351 flush_dcache_page(pp
);
353 mark_page_accessed(pp
);
357 page_cache_release(pp
);
366 * When a file is memory mapped, we must keep the IO data synchronized
367 * between the DMU cache and the memory mapped pages. What this means:
369 * On Read: We "read" preferentially from memory mapped pages,
370 * else we default from the dmu buffer.
372 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
373 * the file is memory mapped.
376 mappedread(struct inode
*ip
, int nbytes
, uio_t
*uio
)
378 struct address_space
*mp
= ip
->i_mapping
;
380 znode_t
*zp
= ITOZ(ip
);
387 start
= uio
->uio_loffset
;
388 off
= start
& (PAGE_CACHE_SIZE
-1);
389 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
390 bytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
392 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
394 ASSERT(PageUptodate(pp
));
397 error
= uiomove(pb
+ off
, bytes
, UIO_READ
, uio
);
400 if (mapping_writably_mapped(mp
))
401 flush_dcache_page(pp
);
403 mark_page_accessed(pp
);
405 page_cache_release(pp
);
407 error
= dmu_read_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
420 unsigned long zfs_read_chunk_size
= 1024 * 1024; /* Tunable */
421 unsigned long zfs_delete_blocks
= DMU_MAX_DELETEBLKCNT
;
424 * Read bytes from specified file into supplied buffer.
426 * IN: ip - inode of file to be read from.
427 * uio - structure supplying read location, range info,
429 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
430 * O_DIRECT flag; used to bypass page cache.
431 * cr - credentials of caller.
433 * OUT: uio - updated offset and range, buffer filled.
435 * RETURN: 0 on success, error code on failure.
438 * inode - atime updated if byte count > 0
442 zfs_read(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
444 znode_t
*zp
= ITOZ(ip
);
445 zfs_sb_t
*zsb
= ITOZSB(ip
);
449 #ifdef HAVE_UIO_ZEROCOPY
451 #endif /* HAVE_UIO_ZEROCOPY */
456 if (zp
->z_pflags
& ZFS_AV_QUARANTINED
) {
458 return (SET_ERROR(EACCES
));
462 * Validate file offset
464 if (uio
->uio_loffset
< (offset_t
)0) {
466 return (SET_ERROR(EINVAL
));
470 * Fasttrack empty reads
472 if (uio
->uio_resid
== 0) {
478 * If we're in FRSYNC mode, sync out this znode before reading it.
480 if (ioflag
& FRSYNC
|| zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
481 zil_commit(zsb
->z_log
, zp
->z_id
);
484 * Lock the range against changes.
486 rl
= zfs_range_lock(zp
, uio
->uio_loffset
, uio
->uio_resid
, RL_READER
);
489 * If we are reading past end-of-file we can skip
490 * to the end; but we might still need to set atime.
492 if (uio
->uio_loffset
>= zp
->z_size
) {
497 ASSERT(uio
->uio_loffset
< zp
->z_size
);
498 n
= MIN(uio
->uio_resid
, zp
->z_size
- uio
->uio_loffset
);
500 #ifdef HAVE_UIO_ZEROCOPY
501 if ((uio
->uio_extflg
== UIO_XUIO
) &&
502 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
)) {
504 int blksz
= zp
->z_blksz
;
505 uint64_t offset
= uio
->uio_loffset
;
507 xuio
= (xuio_t
*)uio
;
509 nblk
= (P2ROUNDUP(offset
+ n
, blksz
) - P2ALIGN(offset
,
512 ASSERT(offset
+ n
<= blksz
);
515 (void) dmu_xuio_init(xuio
, nblk
);
517 if (vn_has_cached_data(ip
)) {
519 * For simplicity, we always allocate a full buffer
520 * even if we only expect to read a portion of a block.
522 while (--nblk
>= 0) {
523 (void) dmu_xuio_add(xuio
,
524 dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
529 #endif /* HAVE_UIO_ZEROCOPY */
532 nbytes
= MIN(n
, zfs_read_chunk_size
-
533 P2PHASE(uio
->uio_loffset
, zfs_read_chunk_size
));
535 if (zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
)) {
536 error
= mappedread(ip
, nbytes
, uio
);
538 error
= dmu_read_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
543 /* convert checksum errors into IO errors */
545 error
= SET_ERROR(EIO
);
552 zfs_range_unlock(rl
);
554 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
558 EXPORT_SYMBOL(zfs_read
);
561 * Write the bytes to a file.
563 * IN: ip - inode of file to be written to.
564 * uio - structure supplying write location, range info,
566 * ioflag - FAPPEND flag set if in append mode.
567 * O_DIRECT flag; used to bypass page cache.
568 * cr - credentials of caller.
570 * OUT: uio - updated offset and range.
572 * RETURN: 0 if success
573 * error code if failure
576 * ip - ctime|mtime updated if byte count > 0
581 zfs_write(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
583 znode_t
*zp
= ITOZ(ip
);
584 rlim64_t limit
= uio
->uio_limit
;
585 ssize_t start_resid
= uio
->uio_resid
;
589 zfs_sb_t
*zsb
= ZTOZSB(zp
);
594 int max_blksz
= zsb
->z_max_blksz
;
597 const iovec_t
*aiov
= NULL
;
600 const iovec_t
*iovp
= uio
->uio_iov
;
603 sa_bulk_attr_t bulk
[4];
604 uint64_t mtime
[2], ctime
[2];
605 ASSERTV(int iovcnt
= uio
->uio_iovcnt
);
608 * Fasttrack empty write
614 if (limit
== RLIM64_INFINITY
|| limit
> MAXOFFSET_T
)
620 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
621 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
622 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
, &zp
->z_size
, 8);
623 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
627 * Callers might not be able to detect properly that we are read-only,
628 * so check it explicitly here.
630 if (zfs_is_readonly(zsb
)) {
632 return (SET_ERROR(EROFS
));
636 * If immutable or not appending then return EPERM
638 if ((zp
->z_pflags
& (ZFS_IMMUTABLE
| ZFS_READONLY
)) ||
639 ((zp
->z_pflags
& ZFS_APPENDONLY
) && !(ioflag
& FAPPEND
) &&
640 (uio
->uio_loffset
< zp
->z_size
))) {
642 return (SET_ERROR(EPERM
));
648 * Validate file offset
650 woff
= ioflag
& FAPPEND
? zp
->z_size
: uio
->uio_loffset
;
653 return (SET_ERROR(EINVAL
));
657 * Pre-fault the pages to ensure slow (eg NFS) pages
659 * Skip this if uio contains loaned arc_buf.
661 #ifdef HAVE_UIO_ZEROCOPY
662 if ((uio
->uio_extflg
== UIO_XUIO
) &&
663 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
))
664 xuio
= (xuio_t
*)uio
;
667 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
670 * If in append mode, set the io offset pointer to eof.
672 if (ioflag
& FAPPEND
) {
674 * Obtain an appending range lock to guarantee file append
675 * semantics. We reset the write offset once we have the lock.
677 rl
= zfs_range_lock(zp
, 0, n
, RL_APPEND
);
679 if (rl
->r_len
== UINT64_MAX
) {
681 * We overlocked the file because this write will cause
682 * the file block size to increase.
683 * Note that zp_size cannot change with this lock held.
687 uio
->uio_loffset
= woff
;
690 * Note that if the file block size will change as a result of
691 * this write, then this range lock will lock the entire file
692 * so that we can re-write the block safely.
694 rl
= zfs_range_lock(zp
, woff
, n
, RL_WRITER
);
698 zfs_range_unlock(rl
);
700 return (SET_ERROR(EFBIG
));
703 if ((woff
+ n
) > limit
|| woff
> (limit
- n
))
706 /* Will this write extend the file length? */
707 write_eof
= (woff
+ n
> zp
->z_size
);
709 end_size
= MAX(zp
->z_size
, woff
+ n
);
712 * Write the file in reasonable size chunks. Each chunk is written
713 * in a separate transaction; this keeps the intent log records small
714 * and allows us to do more fine-grained space accounting.
718 woff
= uio
->uio_loffset
;
719 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
720 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
722 dmu_return_arcbuf(abuf
);
723 error
= SET_ERROR(EDQUOT
);
727 if (xuio
&& abuf
== NULL
) {
728 ASSERT(i_iov
< iovcnt
);
729 ASSERT3U(uio
->uio_segflg
, !=, UIO_BVEC
);
731 abuf
= dmu_xuio_arcbuf(xuio
, i_iov
);
732 dmu_xuio_clear(xuio
, i_iov
);
733 ASSERT((aiov
->iov_base
== abuf
->b_data
) ||
734 ((char *)aiov
->iov_base
- (char *)abuf
->b_data
+
735 aiov
->iov_len
== arc_buf_size(abuf
)));
737 } else if (abuf
== NULL
&& n
>= max_blksz
&&
738 woff
>= zp
->z_size
&&
739 P2PHASE(woff
, max_blksz
) == 0 &&
740 zp
->z_blksz
== max_blksz
) {
742 * This write covers a full block. "Borrow" a buffer
743 * from the dmu so that we can fill it before we enter
744 * a transaction. This avoids the possibility of
745 * holding up the transaction if the data copy hangs
746 * up on a pagefault (e.g., from an NFS server mapping).
750 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
752 ASSERT(abuf
!= NULL
);
753 ASSERT(arc_buf_size(abuf
) == max_blksz
);
754 if ((error
= uiocopy(abuf
->b_data
, max_blksz
,
755 UIO_WRITE
, uio
, &cbytes
))) {
756 dmu_return_arcbuf(abuf
);
759 ASSERT(cbytes
== max_blksz
);
763 * Start a transaction.
765 tx
= dmu_tx_create(zsb
->z_os
);
766 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
767 dmu_tx_hold_write(tx
, zp
->z_id
, woff
, MIN(n
, max_blksz
));
768 zfs_sa_upgrade_txholds(tx
, zp
);
769 error
= dmu_tx_assign(tx
, TXG_WAIT
);
773 dmu_return_arcbuf(abuf
);
778 * If zfs_range_lock() over-locked we grow the blocksize
779 * and then reduce the lock range. This will only happen
780 * on the first iteration since zfs_range_reduce() will
781 * shrink down r_len to the appropriate size.
783 if (rl
->r_len
== UINT64_MAX
) {
786 if (zp
->z_blksz
> max_blksz
) {
788 * File's blocksize is already larger than the
789 * "recordsize" property. Only let it grow to
790 * the next power of 2.
792 ASSERT(!ISP2(zp
->z_blksz
));
793 new_blksz
= MIN(end_size
,
794 1 << highbit64(zp
->z_blksz
));
796 new_blksz
= MIN(end_size
, max_blksz
);
798 zfs_grow_blocksize(zp
, new_blksz
, tx
);
799 zfs_range_reduce(rl
, woff
, n
);
803 * XXX - should we really limit each write to z_max_blksz?
804 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
806 nbytes
= MIN(n
, max_blksz
- P2PHASE(woff
, max_blksz
));
809 tx_bytes
= uio
->uio_resid
;
810 error
= dmu_write_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
812 tx_bytes
-= uio
->uio_resid
;
815 ASSERT(xuio
== NULL
|| tx_bytes
== aiov
->iov_len
);
817 * If this is not a full block write, but we are
818 * extending the file past EOF and this data starts
819 * block-aligned, use assign_arcbuf(). Otherwise,
820 * write via dmu_write().
822 if (tx_bytes
< max_blksz
&& (!write_eof
||
823 aiov
->iov_base
!= abuf
->b_data
)) {
825 dmu_write(zsb
->z_os
, zp
->z_id
, woff
,
826 aiov
->iov_len
, aiov
->iov_base
, tx
);
827 dmu_return_arcbuf(abuf
);
828 xuio_stat_wbuf_copied();
830 ASSERT(xuio
|| tx_bytes
== max_blksz
);
831 dmu_assign_arcbuf(sa_get_db(zp
->z_sa_hdl
),
834 ASSERT(tx_bytes
<= uio
->uio_resid
);
835 uioskip(uio
, tx_bytes
);
838 if (tx_bytes
&& zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
839 update_pages(ip
, woff
, tx_bytes
, zsb
->z_os
, zp
->z_id
);
842 * If we made no progress, we're done. If we made even
843 * partial progress, update the znode and ZIL accordingly.
846 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
847 (void *)&zp
->z_size
, sizeof (uint64_t), tx
);
854 * Clear Set-UID/Set-GID bits on successful write if not
855 * privileged and at least one of the excute bits is set.
857 * It would be nice to to this after all writes have
858 * been done, but that would still expose the ISUID/ISGID
859 * to another app after the partial write is committed.
861 * Note: we don't call zfs_fuid_map_id() here because
862 * user 0 is not an ephemeral uid.
864 mutex_enter(&zp
->z_acl_lock
);
865 if ((zp
->z_mode
& (S_IXUSR
| (S_IXUSR
>> 3) |
866 (S_IXUSR
>> 6))) != 0 &&
867 (zp
->z_mode
& (S_ISUID
| S_ISGID
)) != 0 &&
868 secpolicy_vnode_setid_retain(cr
,
869 (zp
->z_mode
& S_ISUID
) != 0 && zp
->z_uid
== 0) != 0) {
871 zp
->z_mode
&= ~(S_ISUID
| S_ISGID
);
872 newmode
= zp
->z_mode
;
873 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_MODE(zsb
),
874 (void *)&newmode
, sizeof (uint64_t), tx
);
876 mutex_exit(&zp
->z_acl_lock
);
878 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
882 * Update the file size (zp_size) if it has changed;
883 * account for possible concurrent updates.
885 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
886 (void) atomic_cas_64(&zp
->z_size
, end_size
,
891 * If we are replaying and eof is non zero then force
892 * the file size to the specified eof. Note, there's no
893 * concurrency during replay.
895 if (zsb
->z_replay
&& zsb
->z_replay_eof
!= 0)
896 zp
->z_size
= zsb
->z_replay_eof
;
898 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
900 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
,
906 ASSERT(tx_bytes
== nbytes
);
910 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
913 zfs_inode_update(zp
);
914 zfs_range_unlock(rl
);
917 * If we're in replay mode, or we made no progress, return error.
918 * Otherwise, it's at least a partial write, so it's successful.
920 if (zsb
->z_replay
|| uio
->uio_resid
== start_resid
) {
925 if (ioflag
& (FSYNC
| FDSYNC
) ||
926 zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
927 zil_commit(zilog
, zp
->z_id
);
932 EXPORT_SYMBOL(zfs_write
);
935 zfs_iput_async(struct inode
*ip
)
937 objset_t
*os
= ITOZSB(ip
)->z_os
;
939 ASSERT(atomic_read(&ip
->i_count
) > 0);
942 if (atomic_read(&ip
->i_count
) == 1)
943 taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os
)),
944 (task_func_t
*)iput
, ip
, TQ_SLEEP
);
950 zfs_get_done(zgd_t
*zgd
, int error
)
952 znode_t
*zp
= zgd
->zgd_private
;
955 dmu_buf_rele(zgd
->zgd_db
, zgd
);
957 zfs_range_unlock(zgd
->zgd_rl
);
960 * Release the vnode asynchronously as we currently have the
961 * txg stopped from syncing.
963 zfs_iput_async(ZTOI(zp
));
965 if (error
== 0 && zgd
->zgd_bp
)
966 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
968 kmem_free(zgd
, sizeof (zgd_t
));
972 static int zil_fault_io
= 0;
976 * Get data to generate a TX_WRITE intent log record.
979 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
982 objset_t
*os
= zsb
->z_os
;
984 uint64_t object
= lr
->lr_foid
;
985 uint64_t offset
= lr
->lr_offset
;
986 uint64_t size
= lr
->lr_length
;
987 blkptr_t
*bp
= &lr
->lr_blkptr
;
996 * Nothing to do if the file has been removed
998 if (zfs_zget(zsb
, object
, &zp
) != 0)
999 return (SET_ERROR(ENOENT
));
1000 if (zp
->z_unlinked
) {
1002 * Release the vnode asynchronously as we currently have the
1003 * txg stopped from syncing.
1005 zfs_iput_async(ZTOI(zp
));
1006 return (SET_ERROR(ENOENT
));
1009 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_SLEEP
);
1010 zgd
->zgd_zilog
= zsb
->z_log
;
1011 zgd
->zgd_private
= zp
;
1014 * Write records come in two flavors: immediate and indirect.
1015 * For small writes it's cheaper to store the data with the
1016 * log record (immediate); for large writes it's cheaper to
1017 * sync the data and get a pointer to it (indirect) so that
1018 * we don't have to write the data twice.
1020 if (buf
!= NULL
) { /* immediate write */
1021 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
, RL_READER
);
1022 /* test for truncation needs to be done while range locked */
1023 if (offset
>= zp
->z_size
) {
1024 error
= SET_ERROR(ENOENT
);
1026 error
= dmu_read(os
, object
, offset
, size
, buf
,
1027 DMU_READ_NO_PREFETCH
);
1029 ASSERT(error
== 0 || error
== ENOENT
);
1030 } else { /* indirect write */
1032 * Have to lock the whole block to ensure when it's
1033 * written out and it's checksum is being calculated
1034 * that no one can change the data. We need to re-check
1035 * blocksize after we get the lock in case it's changed!
1040 blkoff
= ISP2(size
) ? P2PHASE(offset
, size
) : offset
;
1042 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
,
1044 if (zp
->z_blksz
== size
)
1047 zfs_range_unlock(zgd
->zgd_rl
);
1049 /* test for truncation needs to be done while range locked */
1050 if (lr
->lr_offset
>= zp
->z_size
)
1051 error
= SET_ERROR(ENOENT
);
1054 error
= SET_ERROR(EIO
);
1059 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
1060 DMU_READ_NO_PREFETCH
);
1063 blkptr_t
*obp
= dmu_buf_get_blkptr(db
);
1065 ASSERT(BP_IS_HOLE(bp
));
1072 ASSERT(db
->db_offset
== offset
);
1073 ASSERT(db
->db_size
== size
);
1075 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
1077 ASSERT(error
|| lr
->lr_length
<= zp
->z_blksz
);
1080 * On success, we need to wait for the write I/O
1081 * initiated by dmu_sync() to complete before we can
1082 * release this dbuf. We will finish everything up
1083 * in the zfs_get_done() callback.
1088 if (error
== EALREADY
) {
1089 lr
->lr_common
.lrc_txtype
= TX_WRITE2
;
1095 zfs_get_done(zgd
, error
);
1102 zfs_access(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
1104 znode_t
*zp
= ITOZ(ip
);
1105 zfs_sb_t
*zsb
= ITOZSB(ip
);
1111 if (flag
& V_ACE_MASK
)
1112 error
= zfs_zaccess(zp
, mode
, flag
, B_FALSE
, cr
);
1114 error
= zfs_zaccess_rwx(zp
, mode
, flag
, cr
);
1119 EXPORT_SYMBOL(zfs_access
);
1122 * Lookup an entry in a directory, or an extended attribute directory.
1123 * If it exists, return a held inode reference for it.
1125 * IN: dip - inode of directory to search.
1126 * nm - name of entry to lookup.
1127 * flags - LOOKUP_XATTR set if looking for an attribute.
1128 * cr - credentials of caller.
1129 * direntflags - directory lookup flags
1130 * realpnp - returned pathname.
1132 * OUT: ipp - inode of located entry, NULL if not found.
1134 * RETURN: 0 on success, error code on failure.
1141 zfs_lookup(struct inode
*dip
, char *nm
, struct inode
**ipp
, int flags
,
1142 cred_t
*cr
, int *direntflags
, pathname_t
*realpnp
)
1144 znode_t
*zdp
= ITOZ(dip
);
1145 zfs_sb_t
*zsb
= ITOZSB(dip
);
1149 if (!(flags
& (LOOKUP_XATTR
| FIGNORECASE
))) {
1151 if (!S_ISDIR(dip
->i_mode
)) {
1152 return (SET_ERROR(ENOTDIR
));
1153 } else if (zdp
->z_sa_hdl
== NULL
) {
1154 return (SET_ERROR(EIO
));
1157 if (nm
[0] == 0 || (nm
[0] == '.' && nm
[1] == '\0')) {
1158 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1167 vnode_t
*tvp
= dnlc_lookup(dvp
, nm
);
1170 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1175 if (tvp
== DNLC_NO_VNODE
) {
1177 return (SET_ERROR(ENOENT
));
1180 return (specvp_check(vpp
, cr
));
1183 #endif /* HAVE_DNLC */
1192 if (flags
& LOOKUP_XATTR
) {
1194 * We don't allow recursive attributes..
1195 * Maybe someday we will.
1197 if (zdp
->z_pflags
& ZFS_XATTR
) {
1199 return (SET_ERROR(EINVAL
));
1202 if ((error
= zfs_get_xattrdir(zdp
, ipp
, cr
, flags
))) {
1208 * Do we have permission to get into attribute directory?
1211 if ((error
= zfs_zaccess(ITOZ(*ipp
), ACE_EXECUTE
, 0,
1221 if (!S_ISDIR(dip
->i_mode
)) {
1223 return (SET_ERROR(ENOTDIR
));
1227 * Check accessibility of directory.
1230 if ((error
= zfs_zaccess(zdp
, ACE_EXECUTE
, 0, B_FALSE
, cr
))) {
1235 if (zsb
->z_utf8
&& u8_validate(nm
, strlen(nm
),
1236 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1238 return (SET_ERROR(EILSEQ
));
1241 error
= zfs_dirlook(zdp
, nm
, ipp
, flags
, direntflags
, realpnp
);
1242 if ((error
== 0) && (*ipp
))
1243 zfs_inode_update(ITOZ(*ipp
));
1248 EXPORT_SYMBOL(zfs_lookup
);
1251 * Attempt to create a new entry in a directory. If the entry
1252 * already exists, truncate the file if permissible, else return
1253 * an error. Return the ip of the created or trunc'd file.
1255 * IN: dip - inode of directory to put new file entry in.
1256 * name - name of new file entry.
1257 * vap - attributes of new file.
1258 * excl - flag indicating exclusive or non-exclusive mode.
1259 * mode - mode to open file with.
1260 * cr - credentials of caller.
1261 * flag - large file flag [UNUSED].
1262 * vsecp - ACL to be set
1264 * OUT: ipp - inode of created or trunc'd entry.
1266 * RETURN: 0 on success, error code on failure.
1269 * dip - ctime|mtime updated if new entry created
1270 * ip - ctime|mtime always, atime if new
1275 zfs_create(struct inode
*dip
, char *name
, vattr_t
*vap
, int excl
,
1276 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1278 znode_t
*zp
, *dzp
= ITOZ(dip
);
1279 zfs_sb_t
*zsb
= ITOZSB(dip
);
1287 zfs_acl_ids_t acl_ids
;
1288 boolean_t fuid_dirtied
;
1289 boolean_t have_acl
= B_FALSE
;
1290 boolean_t waited
= B_FALSE
;
1293 * If we have an ephemeral id, ACL, or XVATTR then
1294 * make sure file system is at proper version
1300 if (zsb
->z_use_fuids
== B_FALSE
&&
1301 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1302 return (SET_ERROR(EINVAL
));
1309 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
1310 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1312 return (SET_ERROR(EILSEQ
));
1315 if (vap
->va_mask
& ATTR_XVATTR
) {
1316 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1317 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1325 if (*name
== '\0') {
1327 * Null component name refers to the directory itself.
1334 /* possible igrab(zp) */
1337 if (flag
& FIGNORECASE
)
1340 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1344 zfs_acl_ids_free(&acl_ids
);
1345 if (strcmp(name
, "..") == 0)
1346 error
= SET_ERROR(EISDIR
);
1356 * Create a new file object and update the directory
1359 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1361 zfs_acl_ids_free(&acl_ids
);
1366 * We only support the creation of regular files in
1367 * extended attribute directories.
1370 if ((dzp
->z_pflags
& ZFS_XATTR
) && !S_ISREG(vap
->va_mode
)) {
1372 zfs_acl_ids_free(&acl_ids
);
1373 error
= SET_ERROR(EINVAL
);
1377 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1378 cr
, vsecp
, &acl_ids
)) != 0)
1382 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1383 zfs_acl_ids_free(&acl_ids
);
1384 error
= SET_ERROR(EDQUOT
);
1388 tx
= dmu_tx_create(os
);
1390 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1391 ZFS_SA_BASE_ATTR_SIZE
);
1393 fuid_dirtied
= zsb
->z_fuid_dirty
;
1395 zfs_fuid_txhold(zsb
, tx
);
1396 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
1397 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
1398 if (!zsb
->z_use_sa
&&
1399 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1400 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1401 0, acl_ids
.z_aclp
->z_acl_bytes
);
1403 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1405 zfs_dirent_unlock(dl
);
1406 if (error
== ERESTART
) {
1412 zfs_acl_ids_free(&acl_ids
);
1417 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1420 zfs_fuid_sync(zsb
, tx
);
1422 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1423 txtype
= zfs_log_create_txtype(Z_FILE
, vsecp
, vap
);
1424 if (flag
& FIGNORECASE
)
1426 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, name
,
1427 vsecp
, acl_ids
.z_fuidp
, vap
);
1428 zfs_acl_ids_free(&acl_ids
);
1431 int aflags
= (flag
& FAPPEND
) ? V_APPEND
: 0;
1434 zfs_acl_ids_free(&acl_ids
);
1438 * A directory entry already exists for this name.
1441 * Can't truncate an existing file if in exclusive mode.
1444 error
= SET_ERROR(EEXIST
);
1448 * Can't open a directory for writing.
1450 if (S_ISDIR(ZTOI(zp
)->i_mode
)) {
1451 error
= SET_ERROR(EISDIR
);
1455 * Verify requested access to file.
1457 if (mode
&& (error
= zfs_zaccess_rwx(zp
, mode
, aflags
, cr
))) {
1461 mutex_enter(&dzp
->z_lock
);
1463 mutex_exit(&dzp
->z_lock
);
1466 * Truncate regular files if requested.
1468 if (S_ISREG(ZTOI(zp
)->i_mode
) &&
1469 (vap
->va_mask
& ATTR_SIZE
) && (vap
->va_size
== 0)) {
1470 /* we can't hold any locks when calling zfs_freesp() */
1471 zfs_dirent_unlock(dl
);
1473 error
= zfs_freesp(zp
, 0, 0, mode
, TRUE
);
1479 zfs_dirent_unlock(dl
);
1485 zfs_inode_update(dzp
);
1486 zfs_inode_update(zp
);
1490 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1491 zil_commit(zilog
, 0);
1496 EXPORT_SYMBOL(zfs_create
);
1499 * Remove an entry from a directory.
1501 * IN: dip - inode of directory to remove entry from.
1502 * name - name of entry to remove.
1503 * cr - credentials of caller.
1505 * RETURN: 0 if success
1506 * error code if failure
1510 * ip - ctime (if nlink > 0)
1513 uint64_t null_xattr
= 0;
1517 zfs_remove(struct inode
*dip
, char *name
, cred_t
*cr
)
1519 znode_t
*zp
, *dzp
= ITOZ(dip
);
1522 zfs_sb_t
*zsb
= ITOZSB(dip
);
1524 uint64_t acl_obj
, xattr_obj
;
1525 uint64_t xattr_obj_unlinked
= 0;
1529 boolean_t may_delete_now
, delete_now
= FALSE
;
1530 boolean_t unlinked
, toobig
= FALSE
;
1532 pathname_t
*realnmp
= NULL
;
1533 #ifdef HAVE_PN_UTILS
1535 #endif /* HAVE_PN_UTILS */
1538 boolean_t waited
= B_FALSE
;
1544 #ifdef HAVE_PN_UTILS
1545 if (flags
& FIGNORECASE
) {
1550 #endif /* HAVE_PN_UTILS */
1556 * Attempt to lock directory; fail if entry doesn't exist.
1558 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1560 #ifdef HAVE_PN_UTILS
1563 #endif /* HAVE_PN_UTILS */
1570 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1575 * Need to use rmdir for removing directories.
1577 if (S_ISDIR(ip
->i_mode
)) {
1578 error
= SET_ERROR(EPERM
);
1584 dnlc_remove(dvp
, realnmp
->pn_buf
);
1586 dnlc_remove(dvp
, name
);
1587 #endif /* HAVE_DNLC */
1589 mutex_enter(&zp
->z_lock
);
1590 may_delete_now
= atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
);
1591 mutex_exit(&zp
->z_lock
);
1594 * We may delete the znode now, or we may put it in the unlinked set;
1595 * it depends on whether we're the last link, and on whether there are
1596 * other holds on the inode. So we dmu_tx_hold() the right things to
1597 * allow for either case.
1600 tx
= dmu_tx_create(zsb
->z_os
);
1601 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1602 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1603 zfs_sa_upgrade_txholds(tx
, zp
);
1604 zfs_sa_upgrade_txholds(tx
, dzp
);
1605 if (may_delete_now
) {
1606 toobig
= zp
->z_size
> zp
->z_blksz
* zfs_delete_blocks
;
1607 /* if the file is too big, only hold_free a token amount */
1608 dmu_tx_hold_free(tx
, zp
->z_id
, 0,
1609 (toobig
? DMU_MAX_ACCESS
: DMU_OBJECT_END
));
1612 /* are there any extended attributes? */
1613 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1614 &xattr_obj
, sizeof (xattr_obj
));
1615 if (error
== 0 && xattr_obj
) {
1616 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
1618 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1619 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1622 mutex_enter(&zp
->z_lock
);
1623 if ((acl_obj
= zfs_external_acl(zp
)) != 0 && may_delete_now
)
1624 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
1625 mutex_exit(&zp
->z_lock
);
1627 /* charge as an update -- would be nice not to charge at all */
1628 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1631 * Mark this transaction as typically resulting in a net free of
1632 * space, unless object removal will be delayed indefinitely
1633 * (due to active holds on the vnode due to the file being open).
1636 dmu_tx_mark_netfree(tx
);
1638 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1640 zfs_dirent_unlock(dl
);
1644 if (error
== ERESTART
) {
1650 #ifdef HAVE_PN_UTILS
1653 #endif /* HAVE_PN_UTILS */
1660 * Remove the directory entry.
1662 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1671 * Hold z_lock so that we can make sure that the ACL obj
1672 * hasn't changed. Could have been deleted due to
1675 mutex_enter(&zp
->z_lock
);
1676 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1677 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1678 delete_now
= may_delete_now
&& !toobig
&&
1679 atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
) &&
1680 xattr_obj
== xattr_obj_unlinked
&& zfs_external_acl(zp
) ==
1685 if (xattr_obj_unlinked
) {
1686 ASSERT3U(xzp
->z_links
, ==, 2);
1687 mutex_enter(&xzp
->z_lock
);
1688 xzp
->z_unlinked
= 1;
1690 error
= sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zsb
),
1691 &xzp
->z_links
, sizeof (xzp
->z_links
), tx
);
1692 ASSERT3U(error
, ==, 0);
1693 mutex_exit(&xzp
->z_lock
);
1694 zfs_unlinked_add(xzp
, tx
);
1697 error
= sa_remove(zp
->z_sa_hdl
,
1698 SA_ZPL_XATTR(zsb
), tx
);
1700 error
= sa_update(zp
->z_sa_hdl
,
1701 SA_ZPL_XATTR(zsb
), &null_xattr
,
1702 sizeof (uint64_t), tx
);
1706 * Add to the unlinked set because a new reference could be
1707 * taken concurrently resulting in a deferred destruction.
1709 zfs_unlinked_add(zp
, tx
);
1710 mutex_exit(&zp
->z_lock
);
1711 zfs_inode_update(zp
);
1713 } else if (unlinked
) {
1714 mutex_exit(&zp
->z_lock
);
1715 zfs_unlinked_add(zp
, tx
);
1719 #ifdef HAVE_PN_UTILS
1720 if (flags
& FIGNORECASE
)
1722 #endif /* HAVE_PN_UTILS */
1723 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1727 #ifdef HAVE_PN_UTILS
1730 #endif /* HAVE_PN_UTILS */
1732 zfs_dirent_unlock(dl
);
1733 zfs_inode_update(dzp
);
1736 zfs_inode_update(zp
);
1741 zfs_inode_update(xzp
);
1742 zfs_iput_async(ZTOI(xzp
));
1745 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1746 zil_commit(zilog
, 0);
1751 EXPORT_SYMBOL(zfs_remove
);
1754 * Create a new directory and insert it into dip using the name
1755 * provided. Return a pointer to the inserted directory.
1757 * IN: dip - inode of directory to add subdir to.
1758 * dirname - name of new directory.
1759 * vap - attributes of new directory.
1760 * cr - credentials of caller.
1761 * vsecp - ACL to be set
1763 * OUT: ipp - inode of created directory.
1765 * RETURN: 0 if success
1766 * error code if failure
1769 * dip - ctime|mtime updated
1770 * ipp - ctime|mtime|atime updated
1774 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1775 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1777 znode_t
*zp
, *dzp
= ITOZ(dip
);
1778 zfs_sb_t
*zsb
= ITOZSB(dip
);
1786 gid_t gid
= crgetgid(cr
);
1787 zfs_acl_ids_t acl_ids
;
1788 boolean_t fuid_dirtied
;
1789 boolean_t waited
= B_FALSE
;
1791 ASSERT(S_ISDIR(vap
->va_mode
));
1794 * If we have an ephemeral id, ACL, or XVATTR then
1795 * make sure file system is at proper version
1799 if (zsb
->z_use_fuids
== B_FALSE
&&
1800 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1801 return (SET_ERROR(EINVAL
));
1807 if (dzp
->z_pflags
& ZFS_XATTR
) {
1809 return (SET_ERROR(EINVAL
));
1812 if (zsb
->z_utf8
&& u8_validate(dirname
,
1813 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1815 return (SET_ERROR(EILSEQ
));
1817 if (flags
& FIGNORECASE
)
1820 if (vap
->va_mask
& ATTR_XVATTR
) {
1821 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1822 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1828 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1829 vsecp
, &acl_ids
)) != 0) {
1834 * First make sure the new directory doesn't exist.
1836 * Existence is checked first to make sure we don't return
1837 * EACCES instead of EEXIST which can cause some applications
1843 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1845 zfs_acl_ids_free(&acl_ids
);
1850 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1851 zfs_acl_ids_free(&acl_ids
);
1852 zfs_dirent_unlock(dl
);
1857 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1858 zfs_acl_ids_free(&acl_ids
);
1859 zfs_dirent_unlock(dl
);
1861 return (SET_ERROR(EDQUOT
));
1865 * Add a new entry to the directory.
1867 tx
= dmu_tx_create(zsb
->z_os
);
1868 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
1869 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
1870 fuid_dirtied
= zsb
->z_fuid_dirty
;
1872 zfs_fuid_txhold(zsb
, tx
);
1873 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1874 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
1875 acl_ids
.z_aclp
->z_acl_bytes
);
1878 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1879 ZFS_SA_BASE_ATTR_SIZE
);
1881 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1883 zfs_dirent_unlock(dl
);
1884 if (error
== ERESTART
) {
1890 zfs_acl_ids_free(&acl_ids
);
1899 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1902 zfs_fuid_sync(zsb
, tx
);
1905 * Now put new name in parent dir.
1907 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1911 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
1912 if (flags
& FIGNORECASE
)
1914 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
1915 acl_ids
.z_fuidp
, vap
);
1917 zfs_acl_ids_free(&acl_ids
);
1921 zfs_dirent_unlock(dl
);
1923 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1924 zil_commit(zilog
, 0);
1926 zfs_inode_update(dzp
);
1927 zfs_inode_update(zp
);
1931 EXPORT_SYMBOL(zfs_mkdir
);
1934 * Remove a directory subdir entry. If the current working
1935 * directory is the same as the subdir to be removed, the
1938 * IN: dip - inode of directory to remove from.
1939 * name - name of directory to be removed.
1940 * cwd - inode of current working directory.
1941 * cr - credentials of caller.
1942 * flags - case flags
1944 * RETURN: 0 on success, error code on failure.
1947 * dip - ctime|mtime updated
1951 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
1954 znode_t
*dzp
= ITOZ(dip
);
1957 zfs_sb_t
*zsb
= ITOZSB(dip
);
1963 boolean_t waited
= B_FALSE
;
1969 if (flags
& FIGNORECASE
)
1975 * Attempt to lock directory; fail if entry doesn't exist.
1977 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1985 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1989 if (!S_ISDIR(ip
->i_mode
)) {
1990 error
= SET_ERROR(ENOTDIR
);
1995 error
= SET_ERROR(EINVAL
);
2000 * Grab a lock on the directory to make sure that noone is
2001 * trying to add (or lookup) entries while we are removing it.
2003 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
2006 * Grab a lock on the parent pointer to make sure we play well
2007 * with the treewalk and directory rename code.
2009 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
2011 tx
= dmu_tx_create(zsb
->z_os
);
2012 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
2013 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2014 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
2015 zfs_sa_upgrade_txholds(tx
, zp
);
2016 zfs_sa_upgrade_txholds(tx
, dzp
);
2017 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
2019 rw_exit(&zp
->z_parent_lock
);
2020 rw_exit(&zp
->z_name_lock
);
2021 zfs_dirent_unlock(dl
);
2023 if (error
== ERESTART
) {
2034 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
2037 uint64_t txtype
= TX_RMDIR
;
2038 if (flags
& FIGNORECASE
)
2040 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
2045 rw_exit(&zp
->z_parent_lock
);
2046 rw_exit(&zp
->z_name_lock
);
2048 zfs_dirent_unlock(dl
);
2050 zfs_inode_update(dzp
);
2051 zfs_inode_update(zp
);
2054 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2055 zil_commit(zilog
, 0);
2060 EXPORT_SYMBOL(zfs_rmdir
);
2063 * Read as many directory entries as will fit into the provided
2064 * dirent buffer from the given directory cursor position.
2066 * IN: ip - inode of directory to read.
2067 * dirent - buffer for directory entries.
2069 * OUT: dirent - filler buffer of directory entries.
2071 * RETURN: 0 if success
2072 * error code if failure
2075 * ip - atime updated
2077 * Note that the low 4 bits of the cookie returned by zap is always zero.
2078 * This allows us to use the low range for "special" directory entries:
2079 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2080 * we use the offset 2 for the '.zfs' directory.
2084 zfs_readdir(struct inode
*ip
, struct dir_context
*ctx
, cred_t
*cr
)
2086 znode_t
*zp
= ITOZ(ip
);
2087 zfs_sb_t
*zsb
= ITOZSB(ip
);
2090 zap_attribute_t zap
;
2096 uint64_t offset
; /* must be unsigned; checks for < 1 */
2101 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
2102 &parent
, sizeof (parent
))) != 0)
2106 * Quit if directory has been removed (posix)
2114 prefetch
= zp
->z_zn_prefetch
;
2117 * Initialize the iterator cursor.
2121 * Start iteration from the beginning of the directory.
2123 zap_cursor_init(&zc
, os
, zp
->z_id
);
2126 * The offset is a serialized cursor.
2128 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, offset
);
2132 * Transform to file-system independent format
2137 * Special case `.', `..', and `.zfs'.
2140 (void) strcpy(zap
.za_name
, ".");
2141 zap
.za_normalization_conflict
= 0;
2144 } else if (offset
== 1) {
2145 (void) strcpy(zap
.za_name
, "..");
2146 zap
.za_normalization_conflict
= 0;
2149 } else if (offset
== 2 && zfs_show_ctldir(zp
)) {
2150 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
2151 zap
.za_normalization_conflict
= 0;
2152 objnum
= ZFSCTL_INO_ROOT
;
2158 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
2159 if (error
== ENOENT
)
2166 * Allow multiple entries provided the first entry is
2167 * the object id. Non-zpl consumers may safely make
2168 * use of the additional space.
2170 * XXX: This should be a feature flag for compatibility
2172 if (zap
.za_integer_length
!= 8 ||
2173 zap
.za_num_integers
== 0) {
2174 cmn_err(CE_WARN
, "zap_readdir: bad directory "
2175 "entry, obj = %lld, offset = %lld, "
2176 "length = %d, num = %lld\n",
2177 (u_longlong_t
)zp
->z_id
,
2178 (u_longlong_t
)offset
,
2179 zap
.za_integer_length
,
2180 (u_longlong_t
)zap
.za_num_integers
);
2181 error
= SET_ERROR(ENXIO
);
2185 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
2186 type
= ZFS_DIRENT_TYPE(zap
.za_first_integer
);
2189 done
= !dir_emit(ctx
, zap
.za_name
, strlen(zap
.za_name
),
2194 /* Prefetch znode */
2196 dmu_prefetch(os
, objnum
, 0, 0, 0,
2197 ZIO_PRIORITY_SYNC_READ
);
2201 * Move to the next entry, fill in the previous offset.
2203 if (offset
> 2 || (offset
== 2 && !zfs_show_ctldir(zp
))) {
2204 zap_cursor_advance(&zc
);
2205 offset
= zap_cursor_serialize(&zc
);
2211 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
2214 zap_cursor_fini(&zc
);
2215 if (error
== ENOENT
)
2218 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
2225 EXPORT_SYMBOL(zfs_readdir
);
2227 ulong_t zfs_fsync_sync_cnt
= 4;
2230 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2232 znode_t
*zp
= ITOZ(ip
);
2233 zfs_sb_t
*zsb
= ITOZSB(ip
);
2235 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2237 if (zsb
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2240 zil_commit(zsb
->z_log
, zp
->z_id
);
2243 tsd_set(zfs_fsyncer_key
, NULL
);
2247 EXPORT_SYMBOL(zfs_fsync
);
2251 * Get the requested file attributes and place them in the provided
2254 * IN: ip - inode of file.
2255 * vap - va_mask identifies requested attributes.
2256 * If ATTR_XVATTR set, then optional attrs are requested
2257 * flags - ATTR_NOACLCHECK (CIFS server context)
2258 * cr - credentials of caller.
2260 * OUT: vap - attribute values.
2262 * RETURN: 0 (always succeeds)
2266 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2268 znode_t
*zp
= ITOZ(ip
);
2269 zfs_sb_t
*zsb
= ITOZSB(ip
);
2272 uint64_t mtime
[2], ctime
[2];
2273 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2274 xoptattr_t
*xoap
= NULL
;
2275 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2276 sa_bulk_attr_t bulk
[2];
2282 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2284 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
2285 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
2287 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2293 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2294 * Also, if we are the owner don't bother, since owner should
2295 * always be allowed to read basic attributes of file.
2297 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2298 (vap
->va_uid
!= crgetuid(cr
))) {
2299 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2307 * Return all attributes. It's cheaper to provide the answer
2308 * than to determine whether we were asked the question.
2311 mutex_enter(&zp
->z_lock
);
2312 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2313 vap
->va_mode
= zp
->z_mode
;
2314 vap
->va_fsid
= ZTOI(zp
)->i_sb
->s_dev
;
2315 vap
->va_nodeid
= zp
->z_id
;
2316 if ((zp
->z_id
== zsb
->z_root
) && zfs_show_ctldir(zp
))
2317 links
= zp
->z_links
+ 1;
2319 links
= zp
->z_links
;
2320 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2321 vap
->va_size
= i_size_read(ip
);
2322 vap
->va_rdev
= ip
->i_rdev
;
2323 vap
->va_seq
= ip
->i_generation
;
2326 * Add in any requested optional attributes and the create time.
2327 * Also set the corresponding bits in the returned attribute bitmap.
2329 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zsb
->z_use_fuids
) {
2330 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2332 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2333 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2336 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2337 xoap
->xoa_readonly
=
2338 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2339 XVA_SET_RTN(xvap
, XAT_READONLY
);
2342 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2344 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2345 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2348 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2350 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2351 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2354 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2355 xoap
->xoa_nounlink
=
2356 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2357 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2360 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2361 xoap
->xoa_immutable
=
2362 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2363 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2366 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2367 xoap
->xoa_appendonly
=
2368 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2369 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2372 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2374 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2375 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2378 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2380 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2381 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2384 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2385 xoap
->xoa_av_quarantined
=
2386 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2387 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2390 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2391 xoap
->xoa_av_modified
=
2392 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2393 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2396 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2397 S_ISREG(ip
->i_mode
)) {
2398 zfs_sa_get_scanstamp(zp
, xvap
);
2401 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2404 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zsb
),
2405 times
, sizeof (times
));
2406 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2407 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2410 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2411 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2412 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2414 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2415 xoap
->xoa_generation
= zp
->z_gen
;
2416 XVA_SET_RTN(xvap
, XAT_GEN
);
2419 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2421 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2422 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2425 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2427 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2428 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2432 ZFS_TIME_DECODE(&vap
->va_atime
, zp
->z_atime
);
2433 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2434 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2436 mutex_exit(&zp
->z_lock
);
2438 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2440 if (zp
->z_blksz
== 0) {
2442 * Block size hasn't been set; suggest maximal I/O transfers.
2444 vap
->va_blksize
= zsb
->z_max_blksz
;
2450 EXPORT_SYMBOL(zfs_getattr
);
2453 * Get the basic file attributes and place them in the provided kstat
2454 * structure. The inode is assumed to be the authoritative source
2455 * for most of the attributes. However, the znode currently has the
2456 * authoritative atime, blksize, and block count.
2458 * IN: ip - inode of file.
2460 * OUT: sp - kstat values.
2462 * RETURN: 0 (always succeeds)
2466 zfs_getattr_fast(struct inode
*ip
, struct kstat
*sp
)
2468 znode_t
*zp
= ITOZ(ip
);
2469 zfs_sb_t
*zsb
= ITOZSB(ip
);
2471 u_longlong_t nblocks
;
2476 mutex_enter(&zp
->z_lock
);
2478 generic_fillattr(ip
, sp
);
2479 ZFS_TIME_DECODE(&sp
->atime
, zp
->z_atime
);
2481 sa_object_size(zp
->z_sa_hdl
, &blksize
, &nblocks
);
2482 sp
->blksize
= blksize
;
2483 sp
->blocks
= nblocks
;
2485 if (unlikely(zp
->z_blksz
== 0)) {
2487 * Block size hasn't been set; suggest maximal I/O transfers.
2489 sp
->blksize
= zsb
->z_max_blksz
;
2492 mutex_exit(&zp
->z_lock
);
2495 * Required to prevent NFS client from detecting different inode
2496 * numbers of snapshot root dentry before and after snapshot mount.
2498 if (zsb
->z_issnap
) {
2499 if (ip
->i_sb
->s_root
->d_inode
== ip
)
2500 sp
->ino
= ZFSCTL_INO_SNAPDIRS
-
2501 dmu_objset_id(zsb
->z_os
);
2508 EXPORT_SYMBOL(zfs_getattr_fast
);
2511 * Set the file attributes to the values contained in the
2514 * IN: ip - inode of file to be modified.
2515 * vap - new attribute values.
2516 * If ATTR_XVATTR set, then optional attrs are being set
2517 * flags - ATTR_UTIME set if non-default time values provided.
2518 * - ATTR_NOACLCHECK (CIFS context only).
2519 * cr - credentials of caller.
2521 * RETURN: 0 if success
2522 * error code if failure
2525 * ip - ctime updated, mtime updated if size changed.
2529 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2531 znode_t
*zp
= ITOZ(ip
);
2532 zfs_sb_t
*zsb
= ITOZSB(ip
);
2536 xvattr_t
*tmpxvattr
;
2537 uint_t mask
= vap
->va_mask
;
2538 uint_t saved_mask
= 0;
2541 uint64_t new_uid
, new_gid
;
2543 uint64_t mtime
[2], ctime
[2];
2545 int need_policy
= FALSE
;
2547 zfs_fuid_info_t
*fuidp
= NULL
;
2548 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2551 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2552 boolean_t fuid_dirtied
= B_FALSE
;
2553 sa_bulk_attr_t
*bulk
, *xattr_bulk
;
2554 int count
= 0, xattr_count
= 0;
2565 * Make sure that if we have ephemeral uid/gid or xvattr specified
2566 * that file system is at proper version level
2569 if (zsb
->z_use_fuids
== B_FALSE
&&
2570 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2571 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2572 (mask
& ATTR_XVATTR
))) {
2574 return (SET_ERROR(EINVAL
));
2577 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2579 return (SET_ERROR(EISDIR
));
2582 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2584 return (SET_ERROR(EINVAL
));
2588 * If this is an xvattr_t, then get a pointer to the structure of
2589 * optional attributes. If this is NULL, then we have a vattr_t.
2591 xoap
= xva_getxoptattr(xvap
);
2593 tmpxvattr
= kmem_alloc(sizeof (xvattr_t
), KM_SLEEP
);
2594 xva_init(tmpxvattr
);
2596 bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2597 xattr_bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2600 * Immutable files can only alter immutable bit and atime
2602 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2603 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2604 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2609 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2615 * Verify timestamps doesn't overflow 32 bits.
2616 * ZFS can handle large timestamps, but 32bit syscalls can't
2617 * handle times greater than 2039. This check should be removed
2618 * once large timestamps are fully supported.
2620 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2621 if (((mask
& ATTR_ATIME
) &&
2622 TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2623 ((mask
& ATTR_MTIME
) &&
2624 TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2634 /* Can this be moved to before the top label? */
2635 if (zfs_is_readonly(zsb
)) {
2641 * First validate permissions
2644 if (mask
& ATTR_SIZE
) {
2645 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2650 * XXX - Note, we are not providing any open
2651 * mode flags here (like FNDELAY), so we may
2652 * block if there are locks present... this
2653 * should be addressed in openat().
2655 /* XXX - would it be OK to generate a log record here? */
2656 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2661 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2662 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2663 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2664 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2665 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2666 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2667 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2668 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2669 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2673 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2674 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2679 * NOTE: even if a new mode is being set,
2680 * we may clear S_ISUID/S_ISGID bits.
2683 if (!(mask
& ATTR_MODE
))
2684 vap
->va_mode
= zp
->z_mode
;
2687 * Take ownership or chgrp to group we are a member of
2690 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2691 take_group
= (mask
& ATTR_GID
) &&
2692 zfs_groupmember(zsb
, vap
->va_gid
, cr
);
2695 * If both ATTR_UID and ATTR_GID are set then take_owner and
2696 * take_group must both be set in order to allow taking
2699 * Otherwise, send the check through secpolicy_vnode_setattr()
2703 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2704 take_owner
&& take_group
) ||
2705 ((idmask
== ATTR_UID
) && take_owner
) ||
2706 ((idmask
== ATTR_GID
) && take_group
)) {
2707 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2708 skipaclchk
, cr
) == 0) {
2710 * Remove setuid/setgid for non-privileged users
2712 (void) secpolicy_setid_clear(vap
, cr
);
2713 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2722 mutex_enter(&zp
->z_lock
);
2723 oldva
.va_mode
= zp
->z_mode
;
2724 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2725 if (mask
& ATTR_XVATTR
) {
2727 * Update xvattr mask to include only those attributes
2728 * that are actually changing.
2730 * the bits will be restored prior to actually setting
2731 * the attributes so the caller thinks they were set.
2733 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2734 if (xoap
->xoa_appendonly
!=
2735 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2738 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2739 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2743 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2744 if (xoap
->xoa_nounlink
!=
2745 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2748 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2749 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2753 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2754 if (xoap
->xoa_immutable
!=
2755 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2758 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2759 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2763 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2764 if (xoap
->xoa_nodump
!=
2765 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2768 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2769 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2773 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2774 if (xoap
->xoa_av_modified
!=
2775 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2778 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2779 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2783 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2784 if ((!S_ISREG(ip
->i_mode
) &&
2785 xoap
->xoa_av_quarantined
) ||
2786 xoap
->xoa_av_quarantined
!=
2787 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2790 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2791 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2795 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2796 mutex_exit(&zp
->z_lock
);
2801 if (need_policy
== FALSE
&&
2802 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2803 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2808 mutex_exit(&zp
->z_lock
);
2810 if (mask
& ATTR_MODE
) {
2811 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2812 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2817 trim_mask
|= ATTR_MODE
;
2825 * If trim_mask is set then take ownership
2826 * has been granted or write_acl is present and user
2827 * has the ability to modify mode. In that case remove
2828 * UID|GID and or MODE from mask so that
2829 * secpolicy_vnode_setattr() doesn't revoke it.
2833 saved_mask
= vap
->va_mask
;
2834 vap
->va_mask
&= ~trim_mask
;
2836 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2837 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2842 vap
->va_mask
|= saved_mask
;
2846 * secpolicy_vnode_setattr, or take ownership may have
2849 mask
= vap
->va_mask
;
2851 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2852 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
2853 &xattr_obj
, sizeof (xattr_obj
));
2855 if (err
== 0 && xattr_obj
) {
2856 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
2860 if (mask
& ATTR_UID
) {
2861 new_uid
= zfs_fuid_create(zsb
,
2862 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
2863 if (new_uid
!= zp
->z_uid
&&
2864 zfs_fuid_overquota(zsb
, B_FALSE
, new_uid
)) {
2872 if (mask
& ATTR_GID
) {
2873 new_gid
= zfs_fuid_create(zsb
, (uint64_t)vap
->va_gid
,
2874 cr
, ZFS_GROUP
, &fuidp
);
2875 if (new_gid
!= zp
->z_gid
&&
2876 zfs_fuid_overquota(zsb
, B_TRUE
, new_gid
)) {
2884 tx
= dmu_tx_create(zsb
->z_os
);
2886 if (mask
& ATTR_MODE
) {
2887 uint64_t pmode
= zp
->z_mode
;
2889 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
2891 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
2893 mutex_enter(&zp
->z_lock
);
2894 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
2896 * Are we upgrading ACL from old V0 format
2899 if (zsb
->z_version
>= ZPL_VERSION_FUID
&&
2900 zfs_znode_acl_version(zp
) ==
2901 ZFS_ACL_VERSION_INITIAL
) {
2902 dmu_tx_hold_free(tx
, acl_obj
, 0,
2904 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2905 0, aclp
->z_acl_bytes
);
2907 dmu_tx_hold_write(tx
, acl_obj
, 0,
2910 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
2911 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2912 0, aclp
->z_acl_bytes
);
2914 mutex_exit(&zp
->z_lock
);
2915 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2917 if ((mask
& ATTR_XVATTR
) &&
2918 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2919 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2921 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2925 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
2928 fuid_dirtied
= zsb
->z_fuid_dirty
;
2930 zfs_fuid_txhold(zsb
, tx
);
2932 zfs_sa_upgrade_txholds(tx
, zp
);
2934 err
= dmu_tx_assign(tx
, TXG_WAIT
);
2940 * Set each attribute requested.
2941 * We group settings according to the locks they need to acquire.
2943 * Note: you cannot set ctime directly, although it will be
2944 * updated as a side-effect of calling this function.
2948 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2949 mutex_enter(&zp
->z_acl_lock
);
2950 mutex_enter(&zp
->z_lock
);
2952 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
2953 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
2956 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2957 mutex_enter(&attrzp
->z_acl_lock
);
2958 mutex_enter(&attrzp
->z_lock
);
2959 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2960 SA_ZPL_FLAGS(zsb
), NULL
, &attrzp
->z_pflags
,
2961 sizeof (attrzp
->z_pflags
));
2964 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2966 if (mask
& ATTR_UID
) {
2967 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zsb
), NULL
,
2968 &new_uid
, sizeof (new_uid
));
2969 zp
->z_uid
= new_uid
;
2971 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2972 SA_ZPL_UID(zsb
), NULL
, &new_uid
,
2974 attrzp
->z_uid
= new_uid
;
2978 if (mask
& ATTR_GID
) {
2979 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zsb
),
2980 NULL
, &new_gid
, sizeof (new_gid
));
2981 zp
->z_gid
= new_gid
;
2983 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2984 SA_ZPL_GID(zsb
), NULL
, &new_gid
,
2986 attrzp
->z_gid
= new_gid
;
2989 if (!(mask
& ATTR_MODE
)) {
2990 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
),
2991 NULL
, &new_mode
, sizeof (new_mode
));
2992 new_mode
= zp
->z_mode
;
2994 err
= zfs_acl_chown_setattr(zp
);
2997 err
= zfs_acl_chown_setattr(attrzp
);
3002 if (mask
& ATTR_MODE
) {
3003 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
), NULL
,
3004 &new_mode
, sizeof (new_mode
));
3005 zp
->z_mode
= new_mode
;
3006 ASSERT3P(aclp
, !=, NULL
);
3007 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
3009 if (zp
->z_acl_cached
)
3010 zfs_acl_free(zp
->z_acl_cached
);
3011 zp
->z_acl_cached
= aclp
;
3016 if (mask
& ATTR_ATIME
) {
3017 ZFS_TIME_ENCODE(&vap
->va_atime
, zp
->z_atime
);
3018 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
,
3019 &zp
->z_atime
, sizeof (zp
->z_atime
));
3022 if (mask
& ATTR_MTIME
) {
3023 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
3024 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
3025 mtime
, sizeof (mtime
));
3028 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
3029 if (mask
& ATTR_SIZE
&& !(mask
& ATTR_MTIME
)) {
3030 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
3031 NULL
, mtime
, sizeof (mtime
));
3032 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
3033 &ctime
, sizeof (ctime
));
3034 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
3036 } else if (mask
!= 0) {
3037 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
3038 &ctime
, sizeof (ctime
));
3039 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
3042 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3043 SA_ZPL_CTIME(zsb
), NULL
,
3044 &ctime
, sizeof (ctime
));
3045 zfs_tstamp_update_setup(attrzp
, STATE_CHANGED
,
3046 mtime
, ctime
, B_TRUE
);
3050 * Do this after setting timestamps to prevent timestamp
3051 * update from toggling bit
3054 if (xoap
&& (mask
& ATTR_XVATTR
)) {
3057 * restore trimmed off masks
3058 * so that return masks can be set for caller.
3061 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
3062 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
3064 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
3065 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
3067 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
3068 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
3070 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
3071 XVA_SET_REQ(xvap
, XAT_NODUMP
);
3073 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
3074 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
3076 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
3077 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
3080 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
3081 ASSERT(S_ISREG(ip
->i_mode
));
3083 zfs_xvattr_set(zp
, xvap
, tx
);
3087 zfs_fuid_sync(zsb
, tx
);
3090 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
3092 mutex_exit(&zp
->z_lock
);
3093 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3094 mutex_exit(&zp
->z_acl_lock
);
3097 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3098 mutex_exit(&attrzp
->z_acl_lock
);
3099 mutex_exit(&attrzp
->z_lock
);
3102 if (err
== 0 && attrzp
) {
3103 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
3114 zfs_fuid_info_free(fuidp
);
3120 if (err
== ERESTART
)
3123 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
3125 zfs_inode_update(zp
);
3129 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3130 zil_commit(zilog
, 0);
3133 kmem_free(xattr_bulk
, sizeof (sa_bulk_attr_t
) * 7);
3134 kmem_free(bulk
, sizeof (sa_bulk_attr_t
) * 7);
3135 kmem_free(tmpxvattr
, sizeof (xvattr_t
));
3139 EXPORT_SYMBOL(zfs_setattr
);
3141 typedef struct zfs_zlock
{
3142 krwlock_t
*zl_rwlock
; /* lock we acquired */
3143 znode_t
*zl_znode
; /* znode we held */
3144 struct zfs_zlock
*zl_next
; /* next in list */
3148 * Drop locks and release vnodes that were held by zfs_rename_lock().
3151 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
3155 while ((zl
= *zlpp
) != NULL
) {
3156 if (zl
->zl_znode
!= NULL
)
3157 iput(ZTOI(zl
->zl_znode
));
3158 rw_exit(zl
->zl_rwlock
);
3159 *zlpp
= zl
->zl_next
;
3160 kmem_free(zl
, sizeof (*zl
));
3165 * Search back through the directory tree, using the ".." entries.
3166 * Lock each directory in the chain to prevent concurrent renames.
3167 * Fail any attempt to move a directory into one of its own descendants.
3168 * XXX - z_parent_lock can overlap with map or grow locks
3171 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
3175 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
3176 uint64_t oidp
= zp
->z_id
;
3177 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
3178 krw_t rw
= RW_WRITER
;
3181 * First pass write-locks szp and compares to zp->z_id.
3182 * Later passes read-lock zp and compare to zp->z_parent.
3185 if (!rw_tryenter(rwlp
, rw
)) {
3187 * Another thread is renaming in this path.
3188 * Note that if we are a WRITER, we don't have any
3189 * parent_locks held yet.
3191 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
3193 * Drop our locks and restart
3195 zfs_rename_unlock(&zl
);
3199 rwlp
= &szp
->z_parent_lock
;
3204 * Wait for other thread to drop its locks
3210 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
3211 zl
->zl_rwlock
= rwlp
;
3212 zl
->zl_znode
= NULL
;
3213 zl
->zl_next
= *zlpp
;
3216 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
3217 return (SET_ERROR(EINVAL
));
3219 if (oidp
== rootid
) /* We've hit the top */
3222 if (rw
== RW_READER
) { /* i.e. not the first pass */
3223 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
3228 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
3229 &oidp
, sizeof (oidp
));
3230 rwlp
= &zp
->z_parent_lock
;
3233 } while (zp
->z_id
!= sdzp
->z_id
);
3239 * Move an entry from the provided source directory to the target
3240 * directory. Change the entry name as indicated.
3242 * IN: sdip - Source directory containing the "old entry".
3243 * snm - Old entry name.
3244 * tdip - Target directory to contain the "new entry".
3245 * tnm - New entry name.
3246 * cr - credentials of caller.
3247 * flags - case flags
3249 * RETURN: 0 on success, error code on failure.
3252 * sdip,tdip - ctime|mtime updated
3256 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
3257 cred_t
*cr
, int flags
)
3259 znode_t
*tdzp
, *szp
, *tzp
;
3260 znode_t
*sdzp
= ITOZ(sdip
);
3261 zfs_sb_t
*zsb
= ITOZSB(sdip
);
3263 zfs_dirlock_t
*sdl
, *tdl
;
3266 int cmp
, serr
, terr
;
3269 boolean_t waited
= B_FALSE
;
3272 ZFS_VERIFY_ZP(sdzp
);
3276 ZFS_VERIFY_ZP(tdzp
);
3279 * We check i_sb because snapshots and the ctldir must have different
3282 if (tdip
->i_sb
!= sdip
->i_sb
|| zfsctl_is_node(tdip
)) {
3284 return (SET_ERROR(EXDEV
));
3287 if (zsb
->z_utf8
&& u8_validate(tnm
,
3288 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3290 return (SET_ERROR(EILSEQ
));
3293 if (flags
& FIGNORECASE
)
3302 * This is to prevent the creation of links into attribute space
3303 * by renaming a linked file into/outof an attribute directory.
3304 * See the comment in zfs_link() for why this is considered bad.
3306 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3308 return (SET_ERROR(EINVAL
));
3312 * Lock source and target directory entries. To prevent deadlock,
3313 * a lock ordering must be defined. We lock the directory with
3314 * the smallest object id first, or if it's a tie, the one with
3315 * the lexically first name.
3317 if (sdzp
->z_id
< tdzp
->z_id
) {
3319 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3323 * First compare the two name arguments without
3324 * considering any case folding.
3326 int nofold
= (zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3328 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3329 ASSERT(error
== 0 || !zsb
->z_utf8
);
3332 * POSIX: "If the old argument and the new argument
3333 * both refer to links to the same existing file,
3334 * the rename() function shall return successfully
3335 * and perform no other action."
3341 * If the file system is case-folding, then we may
3342 * have some more checking to do. A case-folding file
3343 * system is either supporting mixed case sensitivity
3344 * access or is completely case-insensitive. Note
3345 * that the file system is always case preserving.
3347 * In mixed sensitivity mode case sensitive behavior
3348 * is the default. FIGNORECASE must be used to
3349 * explicitly request case insensitive behavior.
3351 * If the source and target names provided differ only
3352 * by case (e.g., a request to rename 'tim' to 'Tim'),
3353 * we will treat this as a special case in the
3354 * case-insensitive mode: as long as the source name
3355 * is an exact match, we will allow this to proceed as
3356 * a name-change request.
3358 if ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
||
3359 (zsb
->z_case
== ZFS_CASE_MIXED
&&
3360 flags
& FIGNORECASE
)) &&
3361 u8_strcmp(snm
, tnm
, 0, zsb
->z_norm
, U8_UNICODE_LATEST
,
3364 * case preserving rename request, require exact
3373 * If the source and destination directories are the same, we should
3374 * grab the z_name_lock of that directory only once.
3378 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3382 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3383 ZEXISTS
| zflg
, NULL
, NULL
);
3384 terr
= zfs_dirent_lock(&tdl
,
3385 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3387 terr
= zfs_dirent_lock(&tdl
,
3388 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3389 serr
= zfs_dirent_lock(&sdl
,
3390 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3396 * Source entry invalid or not there.
3399 zfs_dirent_unlock(tdl
);
3405 rw_exit(&sdzp
->z_name_lock
);
3407 if (strcmp(snm
, "..") == 0)
3413 zfs_dirent_unlock(sdl
);
3417 rw_exit(&sdzp
->z_name_lock
);
3419 if (strcmp(tnm
, "..") == 0)
3426 * Must have write access at the source to remove the old entry
3427 * and write access at the target to create the new entry.
3428 * Note that if target and source are the same, this can be
3429 * done in a single check.
3432 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3435 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3437 * Check to make sure rename is valid.
3438 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3440 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3445 * Does target exist?
3449 * Source and target must be the same type.
3451 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3452 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3453 error
= SET_ERROR(ENOTDIR
);
3457 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3458 error
= SET_ERROR(EISDIR
);
3463 * POSIX dictates that when the source and target
3464 * entries refer to the same file object, rename
3465 * must do nothing and exit without error.
3467 if (szp
->z_id
== tzp
->z_id
) {
3473 tx
= dmu_tx_create(zsb
->z_os
);
3474 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3475 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3476 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3477 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3479 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3480 zfs_sa_upgrade_txholds(tx
, tdzp
);
3483 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3484 zfs_sa_upgrade_txholds(tx
, tzp
);
3487 zfs_sa_upgrade_txholds(tx
, szp
);
3488 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
3489 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3492 zfs_rename_unlock(&zl
);
3493 zfs_dirent_unlock(sdl
);
3494 zfs_dirent_unlock(tdl
);
3497 rw_exit(&sdzp
->z_name_lock
);
3502 if (error
== ERESTART
) {
3513 if (tzp
) /* Attempt to remove the existing target */
3514 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3517 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3519 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3521 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zsb
),
3522 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3525 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3527 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3528 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3529 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3532 * At this point, we have successfully created
3533 * the target name, but have failed to remove
3534 * the source name. Since the create was done
3535 * with the ZRENAMING flag, there are
3536 * complications; for one, the link count is
3537 * wrong. The easiest way to deal with this
3538 * is to remove the newly created target, and
3539 * return the original error. This must
3540 * succeed; fortunately, it is very unlikely to
3541 * fail, since we just created it.
3543 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3544 ZRENAMING
, NULL
), ==, 0);
3552 zfs_rename_unlock(&zl
);
3554 zfs_dirent_unlock(sdl
);
3555 zfs_dirent_unlock(tdl
);
3557 zfs_inode_update(sdzp
);
3559 rw_exit(&sdzp
->z_name_lock
);
3562 zfs_inode_update(tdzp
);
3564 zfs_inode_update(szp
);
3567 zfs_inode_update(tzp
);
3571 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3572 zil_commit(zilog
, 0);
3577 EXPORT_SYMBOL(zfs_rename
);
3580 * Insert the indicated symbolic reference entry into the directory.
3582 * IN: dip - Directory to contain new symbolic link.
3583 * link - Name for new symlink entry.
3584 * vap - Attributes of new entry.
3585 * target - Target path of new symlink.
3587 * cr - credentials of caller.
3588 * flags - case flags
3590 * RETURN: 0 on success, error code on failure.
3593 * dip - ctime|mtime updated
3597 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3598 struct inode
**ipp
, cred_t
*cr
, int flags
)
3600 znode_t
*zp
, *dzp
= ITOZ(dip
);
3603 zfs_sb_t
*zsb
= ITOZSB(dip
);
3605 uint64_t len
= strlen(link
);
3608 zfs_acl_ids_t acl_ids
;
3609 boolean_t fuid_dirtied
;
3610 uint64_t txtype
= TX_SYMLINK
;
3611 boolean_t waited
= B_FALSE
;
3613 ASSERT(S_ISLNK(vap
->va_mode
));
3619 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
3620 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3622 return (SET_ERROR(EILSEQ
));
3624 if (flags
& FIGNORECASE
)
3627 if (len
> MAXPATHLEN
) {
3629 return (SET_ERROR(ENAMETOOLONG
));
3632 if ((error
= zfs_acl_ids_create(dzp
, 0,
3633 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3641 * Attempt to lock directory; fail if entry already exists.
3643 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3645 zfs_acl_ids_free(&acl_ids
);
3650 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3651 zfs_acl_ids_free(&acl_ids
);
3652 zfs_dirent_unlock(dl
);
3657 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
3658 zfs_acl_ids_free(&acl_ids
);
3659 zfs_dirent_unlock(dl
);
3661 return (SET_ERROR(EDQUOT
));
3663 tx
= dmu_tx_create(zsb
->z_os
);
3664 fuid_dirtied
= zsb
->z_fuid_dirty
;
3665 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3666 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3667 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3668 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3669 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3670 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3671 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3672 acl_ids
.z_aclp
->z_acl_bytes
);
3675 zfs_fuid_txhold(zsb
, tx
);
3676 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3678 zfs_dirent_unlock(dl
);
3679 if (error
== ERESTART
) {
3685 zfs_acl_ids_free(&acl_ids
);
3692 * Create a new object for the symlink.
3693 * for version 4 ZPL datsets the symlink will be an SA attribute
3695 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3698 zfs_fuid_sync(zsb
, tx
);
3700 mutex_enter(&zp
->z_lock
);
3702 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zsb
),
3705 zfs_sa_symlink(zp
, link
, len
, tx
);
3706 mutex_exit(&zp
->z_lock
);
3709 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
3710 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3712 * Insert the new object into the directory.
3714 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3716 if (flags
& FIGNORECASE
)
3718 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3720 zfs_inode_update(dzp
);
3721 zfs_inode_update(zp
);
3723 zfs_acl_ids_free(&acl_ids
);
3727 zfs_dirent_unlock(dl
);
3731 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3732 zil_commit(zilog
, 0);
3737 EXPORT_SYMBOL(zfs_symlink
);
3740 * Return, in the buffer contained in the provided uio structure,
3741 * the symbolic path referred to by ip.
3743 * IN: ip - inode of symbolic link
3744 * uio - structure to contain the link path.
3745 * cr - credentials of caller.
3747 * RETURN: 0 if success
3748 * error code if failure
3751 * ip - atime updated
3755 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3757 znode_t
*zp
= ITOZ(ip
);
3758 zfs_sb_t
*zsb
= ITOZSB(ip
);
3764 mutex_enter(&zp
->z_lock
);
3766 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3767 SA_ZPL_SYMLINK(zsb
), uio
);
3769 error
= zfs_sa_readlink(zp
, uio
);
3770 mutex_exit(&zp
->z_lock
);
3772 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
3776 EXPORT_SYMBOL(zfs_readlink
);
3779 * Insert a new entry into directory tdip referencing sip.
3781 * IN: tdip - Directory to contain new entry.
3782 * sip - inode of new entry.
3783 * name - name of new entry.
3784 * cr - credentials of caller.
3786 * RETURN: 0 if success
3787 * error code if failure
3790 * tdip - ctime|mtime updated
3791 * sip - ctime updated
3795 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
)
3797 znode_t
*dzp
= ITOZ(tdip
);
3799 zfs_sb_t
*zsb
= ITOZSB(tdip
);
3807 boolean_t waited
= B_FALSE
;
3809 ASSERT(S_ISDIR(tdip
->i_mode
));
3816 * POSIX dictates that we return EPERM here.
3817 * Better choices include ENOTSUP or EISDIR.
3819 if (S_ISDIR(sip
->i_mode
)) {
3821 return (SET_ERROR(EPERM
));
3828 * We check i_sb because snapshots and the ctldir must have different
3831 if (sip
->i_sb
!= tdip
->i_sb
|| zfsctl_is_node(sip
)) {
3833 return (SET_ERROR(EXDEV
));
3836 /* Prevent links to .zfs/shares files */
3838 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
3839 &parent
, sizeof (uint64_t))) != 0) {
3843 if (parent
== zsb
->z_shares_dir
) {
3845 return (SET_ERROR(EPERM
));
3848 if (zsb
->z_utf8
&& u8_validate(name
,
3849 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3851 return (SET_ERROR(EILSEQ
));
3853 #ifdef HAVE_PN_UTILS
3854 if (flags
& FIGNORECASE
)
3856 #endif /* HAVE_PN_UTILS */
3859 * We do not support links between attributes and non-attributes
3860 * because of the potential security risk of creating links
3861 * into "normal" file space in order to circumvent restrictions
3862 * imposed in attribute space.
3864 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
3866 return (SET_ERROR(EINVAL
));
3869 owner
= zfs_fuid_map_id(zsb
, szp
->z_uid
, cr
, ZFS_OWNER
);
3870 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
3872 return (SET_ERROR(EPERM
));
3875 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3882 * Attempt to lock directory; fail if entry already exists.
3884 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
3890 tx
= dmu_tx_create(zsb
->z_os
);
3891 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3892 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3893 zfs_sa_upgrade_txholds(tx
, szp
);
3894 zfs_sa_upgrade_txholds(tx
, dzp
);
3895 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3897 zfs_dirent_unlock(dl
);
3898 if (error
== ERESTART
) {
3909 error
= zfs_link_create(dl
, szp
, tx
, 0);
3912 uint64_t txtype
= TX_LINK
;
3913 #ifdef HAVE_PN_UTILS
3914 if (flags
& FIGNORECASE
)
3916 #endif /* HAVE_PN_UTILS */
3917 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
3922 zfs_dirent_unlock(dl
);
3924 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3925 zil_commit(zilog
, 0);
3927 zfs_inode_update(dzp
);
3928 zfs_inode_update(szp
);
3932 EXPORT_SYMBOL(zfs_link
);
3935 zfs_putpage_commit_cb(void *arg
)
3937 struct page
*pp
= arg
;
3940 end_page_writeback(pp
);
3944 * Push a page out to disk, once the page is on stable storage the
3945 * registered commit callback will be run as notification of completion.
3947 * IN: ip - page mapped for inode.
3948 * pp - page to push (page is locked)
3949 * wbc - writeback control data
3951 * RETURN: 0 if success
3952 * error code if failure
3955 * ip - ctime|mtime updated
3959 zfs_putpage(struct inode
*ip
, struct page
*pp
, struct writeback_control
*wbc
)
3961 znode_t
*zp
= ITOZ(ip
);
3962 zfs_sb_t
*zsb
= ITOZSB(ip
);
3970 uint64_t mtime
[2], ctime
[2];
3971 sa_bulk_attr_t bulk
[3];
3973 struct address_space
*mapping
;
3978 ASSERT(PageLocked(pp
));
3980 pgoff
= page_offset(pp
); /* Page byte-offset in file */
3981 offset
= i_size_read(ip
); /* File length in bytes */
3982 pglen
= MIN(PAGE_CACHE_SIZE
, /* Page length in bytes */
3983 P2ROUNDUP(offset
, PAGE_CACHE_SIZE
)-pgoff
);
3985 /* Page is beyond end of file */
3986 if (pgoff
>= offset
) {
3992 /* Truncate page length to end of file */
3993 if (pgoff
+ pglen
> offset
)
3994 pglen
= offset
- pgoff
;
3998 * FIXME: Allow mmap writes past its quota. The correct fix
3999 * is to register a page_mkwrite() handler to count the page
4000 * against its quota when it is about to be dirtied.
4002 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
4003 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
4009 * The ordering here is critical and must adhere to the following
4010 * rules in order to avoid deadlocking in either zfs_read() or
4011 * zfs_free_range() due to a lock inversion.
4013 * 1) The page must be unlocked prior to acquiring the range lock.
4014 * This is critical because zfs_read() calls find_lock_page()
4015 * which may block on the page lock while holding the range lock.
4017 * 2) Before setting or clearing write back on a page the range lock
4018 * must be held in order to prevent a lock inversion with the
4019 * zfs_free_range() function.
4021 * This presents a problem because upon entering this function the
4022 * page lock is already held. To safely acquire the range lock the
4023 * page lock must be dropped. This creates a window where another
4024 * process could truncate, invalidate, dirty, or write out the page.
4026 * Therefore, after successfully reacquiring the range and page locks
4027 * the current page state is checked. In the common case everything
4028 * will be as is expected and it can be written out. However, if
4029 * the page state has changed it must be handled accordingly.
4031 mapping
= pp
->mapping
;
4032 redirty_page_for_writepage(wbc
, pp
);
4035 rl
= zfs_range_lock(zp
, pgoff
, pglen
, RL_WRITER
);
4038 /* Page mapping changed or it was no longer dirty, we're done */
4039 if (unlikely((mapping
!= pp
->mapping
) || !PageDirty(pp
))) {
4041 zfs_range_unlock(rl
);
4046 /* Another process started write block if required */
4047 if (PageWriteback(pp
)) {
4049 zfs_range_unlock(rl
);
4051 if (wbc
->sync_mode
!= WB_SYNC_NONE
)
4052 wait_on_page_writeback(pp
);
4058 /* Clear the dirty flag the required locks are held */
4059 if (!clear_page_dirty_for_io(pp
)) {
4061 zfs_range_unlock(rl
);
4067 * Counterpart for redirty_page_for_writepage() above. This page
4068 * was in fact not skipped and should not be counted as if it were.
4070 wbc
->pages_skipped
--;
4071 set_page_writeback(pp
);
4074 tx
= dmu_tx_create(zsb
->z_os
);
4075 dmu_tx_hold_write(tx
, zp
->z_id
, pgoff
, pglen
);
4076 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4077 zfs_sa_upgrade_txholds(tx
, zp
);
4079 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
4081 if (err
== ERESTART
)
4085 __set_page_dirty_nobuffers(pp
);
4087 end_page_writeback(pp
);
4088 zfs_range_unlock(rl
);
4094 ASSERT3U(pglen
, <=, PAGE_CACHE_SIZE
);
4095 dmu_write(zsb
->z_os
, zp
->z_id
, pgoff
, pglen
, va
, tx
);
4098 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
4099 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
4100 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_FLAGS(zsb
), NULL
, &zp
->z_pflags
, 8);
4102 /* Preserve the mtime and ctime provided by the inode */
4103 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4104 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4105 zp
->z_atime_dirty
= 0;
4108 err
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4110 zfs_log_write(zsb
->z_log
, tx
, TX_WRITE
, zp
, pgoff
, pglen
, 0,
4111 zfs_putpage_commit_cb
, pp
);
4114 zfs_range_unlock(rl
);
4116 if (wbc
->sync_mode
!= WB_SYNC_NONE
) {
4118 * Note that this is rarely called under writepages(), because
4119 * writepages() normally handles the entire commit for
4120 * performance reasons.
4122 if (zsb
->z_log
!= NULL
)
4123 zil_commit(zsb
->z_log
, zp
->z_id
);
4131 * Update the system attributes when the inode has been dirtied. For the
4132 * moment we only update the mode, atime, mtime, and ctime.
4135 zfs_dirty_inode(struct inode
*ip
, int flags
)
4137 znode_t
*zp
= ITOZ(ip
);
4138 zfs_sb_t
*zsb
= ITOZSB(ip
);
4140 uint64_t mode
, atime
[2], mtime
[2], ctime
[2];
4141 sa_bulk_attr_t bulk
[4];
4145 if (zfs_is_readonly(zsb
) || dmu_objset_is_snapshot(zsb
->z_os
))
4151 tx
= dmu_tx_create(zsb
->z_os
);
4153 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4154 zfs_sa_upgrade_txholds(tx
, zp
);
4156 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4162 mutex_enter(&zp
->z_lock
);
4163 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MODE(zsb
), NULL
, &mode
, 8);
4164 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_ATIME(zsb
), NULL
, &atime
, 16);
4165 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
4166 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
4168 /* Preserve the mode, mtime and ctime provided by the inode */
4169 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4170 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4171 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4175 zp
->z_atime_dirty
= 0;
4177 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4178 mutex_exit(&zp
->z_lock
);
4185 EXPORT_SYMBOL(zfs_dirty_inode
);
4189 zfs_inactive(struct inode
*ip
)
4191 znode_t
*zp
= ITOZ(ip
);
4192 zfs_sb_t
*zsb
= ITOZSB(ip
);
4194 int need_unlock
= 0;
4196 /* Only read lock if we haven't already write locked, e.g. rollback */
4197 if (!RW_WRITE_HELD(&zsb
->z_teardown_inactive_lock
)) {
4199 rw_enter(&zsb
->z_teardown_inactive_lock
, RW_READER
);
4201 if (zp
->z_sa_hdl
== NULL
) {
4203 rw_exit(&zsb
->z_teardown_inactive_lock
);
4207 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
4208 dmu_tx_t
*tx
= dmu_tx_create(zsb
->z_os
);
4210 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4211 zfs_sa_upgrade_txholds(tx
, zp
);
4212 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4216 mutex_enter(&zp
->z_lock
);
4217 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zsb
),
4218 (void *)&zp
->z_atime
, sizeof (zp
->z_atime
), tx
);
4219 zp
->z_atime_dirty
= 0;
4220 mutex_exit(&zp
->z_lock
);
4227 rw_exit(&zsb
->z_teardown_inactive_lock
);
4229 EXPORT_SYMBOL(zfs_inactive
);
4232 * Bounds-check the seek operation.
4234 * IN: ip - inode seeking within
4235 * ooff - old file offset
4236 * noffp - pointer to new file offset
4237 * ct - caller context
4239 * RETURN: 0 if success
4240 * EINVAL if new offset invalid
4244 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
4246 if (S_ISDIR(ip
->i_mode
))
4248 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
4250 EXPORT_SYMBOL(zfs_seek
);
4253 * Fill pages with data from the disk.
4256 zfs_fillpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4258 znode_t
*zp
= ITOZ(ip
);
4259 zfs_sb_t
*zsb
= ITOZSB(ip
);
4261 struct page
*cur_pp
;
4262 u_offset_t io_off
, total
;
4269 io_len
= nr_pages
<< PAGE_CACHE_SHIFT
;
4270 i_size
= i_size_read(ip
);
4271 io_off
= page_offset(pl
[0]);
4273 if (io_off
+ io_len
> i_size
)
4274 io_len
= i_size
- io_off
;
4277 * Iterate over list of pages and read each page individually.
4281 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
4285 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
4289 /* convert checksum errors into IO errors */
4291 err
= SET_ERROR(EIO
);
4294 cur_pp
= pl
[++page_idx
];
4301 * Uses zfs_fillpage to read data from the file and fill the pages.
4303 * IN: ip - inode of file to get data from.
4304 * pl - list of pages to read
4305 * nr_pages - number of pages to read
4307 * RETURN: 0 on success, error code on failure.
4310 * vp - atime updated
4314 zfs_getpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4316 znode_t
*zp
= ITOZ(ip
);
4317 zfs_sb_t
*zsb
= ITOZSB(ip
);
4326 err
= zfs_fillpage(ip
, pl
, nr_pages
);
4329 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
4334 EXPORT_SYMBOL(zfs_getpage
);
4337 * Check ZFS specific permissions to memory map a section of a file.
4339 * IN: ip - inode of the file to mmap
4341 * addrp - start address in memory region
4342 * len - length of memory region
4343 * vm_flags- address flags
4345 * RETURN: 0 if success
4346 * error code if failure
4350 zfs_map(struct inode
*ip
, offset_t off
, caddr_t
*addrp
, size_t len
,
4351 unsigned long vm_flags
)
4353 znode_t
*zp
= ITOZ(ip
);
4354 zfs_sb_t
*zsb
= ITOZSB(ip
);
4359 if ((vm_flags
& VM_WRITE
) && (zp
->z_pflags
&
4360 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4362 return (SET_ERROR(EPERM
));
4365 if ((vm_flags
& (VM_READ
| VM_EXEC
)) &&
4366 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4368 return (SET_ERROR(EACCES
));
4371 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4373 return (SET_ERROR(ENXIO
));
4379 EXPORT_SYMBOL(zfs_map
);
4382 * convoff - converts the given data (start, whence) to the
4386 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4391 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4392 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4396 switch (lckdat
->l_whence
) {
4398 lckdat
->l_start
+= offset
;
4401 lckdat
->l_start
+= vap
.va_size
;
4406 return (SET_ERROR(EINVAL
));
4409 if (lckdat
->l_start
< 0)
4410 return (SET_ERROR(EINVAL
));
4414 lckdat
->l_start
-= offset
;
4417 lckdat
->l_start
-= vap
.va_size
;
4422 return (SET_ERROR(EINVAL
));
4425 lckdat
->l_whence
= (short)whence
;
4430 * Free or allocate space in a file. Currently, this function only
4431 * supports the `F_FREESP' command. However, this command is somewhat
4432 * misnamed, as its functionality includes the ability to allocate as
4433 * well as free space.
4435 * IN: ip - inode of file to free data in.
4436 * cmd - action to take (only F_FREESP supported).
4437 * bfp - section of file to free/alloc.
4438 * flag - current file open mode flags.
4439 * offset - current file offset.
4440 * cr - credentials of caller [UNUSED].
4442 * RETURN: 0 on success, error code on failure.
4445 * ip - ctime|mtime updated
4449 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4450 offset_t offset
, cred_t
*cr
)
4452 znode_t
*zp
= ITOZ(ip
);
4453 zfs_sb_t
*zsb
= ITOZSB(ip
);
4460 if (cmd
!= F_FREESP
) {
4462 return (SET_ERROR(EINVAL
));
4466 * Callers might not be able to detect properly that we are read-only,
4467 * so check it explicitly here.
4469 if (zfs_is_readonly(zsb
)) {
4471 return (SET_ERROR(EROFS
));
4474 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4479 if (bfp
->l_len
< 0) {
4481 return (SET_ERROR(EINVAL
));
4485 * Permissions aren't checked on Solaris because on this OS
4486 * zfs_space() can only be called with an opened file handle.
4487 * On Linux we can get here through truncate_range() which
4488 * operates directly on inodes, so we need to check access rights.
4490 if ((error
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
))) {
4496 len
= bfp
->l_len
; /* 0 means from off to end of file */
4498 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4503 EXPORT_SYMBOL(zfs_space
);
4507 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4509 znode_t
*zp
= ITOZ(ip
);
4510 zfs_sb_t
*zsb
= ITOZSB(ip
);
4513 uint64_t object
= zp
->z_id
;
4520 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zsb
),
4521 &gen64
, sizeof (uint64_t))) != 0) {
4526 gen
= (uint32_t)gen64
;
4528 size
= (zsb
->z_parent
!= zsb
) ? LONG_FID_LEN
: SHORT_FID_LEN
;
4529 if (fidp
->fid_len
< size
) {
4530 fidp
->fid_len
= size
;
4532 return (SET_ERROR(ENOSPC
));
4535 zfid
= (zfid_short_t
*)fidp
;
4537 zfid
->zf_len
= size
;
4539 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4540 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4542 /* Must have a non-zero generation number to distinguish from .zfs */
4545 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4546 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4548 if (size
== LONG_FID_LEN
) {
4549 uint64_t objsetid
= dmu_objset_id(zsb
->z_os
);
4552 zlfid
= (zfid_long_t
*)fidp
;
4554 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
4555 zlfid
->zf_setid
[i
] = (uint8_t)(objsetid
>> (8 * i
));
4557 /* XXX - this should be the generation number for the objset */
4558 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
4559 zlfid
->zf_setgen
[i
] = 0;
4565 EXPORT_SYMBOL(zfs_fid
);
4569 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4571 znode_t
*zp
= ITOZ(ip
);
4572 zfs_sb_t
*zsb
= ITOZSB(ip
);
4574 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4578 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4583 EXPORT_SYMBOL(zfs_getsecattr
);
4587 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4589 znode_t
*zp
= ITOZ(ip
);
4590 zfs_sb_t
*zsb
= ITOZSB(ip
);
4592 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4593 zilog_t
*zilog
= zsb
->z_log
;
4598 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4600 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4601 zil_commit(zilog
, 0);
4606 EXPORT_SYMBOL(zfs_setsecattr
);
4608 #ifdef HAVE_UIO_ZEROCOPY
4610 * Tunable, both must be a power of 2.
4612 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4613 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4614 * an arcbuf for a partial block read
4616 int zcr_blksz_min
= (1 << 10); /* 1K */
4617 int zcr_blksz_max
= (1 << 17); /* 128K */
4621 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4623 znode_t
*zp
= ITOZ(ip
);
4624 zfs_sb_t
*zsb
= ITOZSB(ip
);
4625 int max_blksz
= zsb
->z_max_blksz
;
4626 uio_t
*uio
= &xuio
->xu_uio
;
4627 ssize_t size
= uio
->uio_resid
;
4628 offset_t offset
= uio
->uio_loffset
;
4633 int preamble
, postamble
;
4635 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4636 return (SET_ERROR(EINVAL
));
4643 * Loan out an arc_buf for write if write size is bigger than
4644 * max_blksz, and the file's block size is also max_blksz.
4647 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4649 return (SET_ERROR(EINVAL
));
4652 * Caller requests buffers for write before knowing where the
4653 * write offset might be (e.g. NFS TCP write).
4658 preamble
= P2PHASE(offset
, blksz
);
4660 preamble
= blksz
- preamble
;
4665 postamble
= P2PHASE(size
, blksz
);
4668 fullblk
= size
/ blksz
;
4669 (void) dmu_xuio_init(xuio
,
4670 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4673 * Have to fix iov base/len for partial buffers. They
4674 * currently represent full arc_buf's.
4677 /* data begins in the middle of the arc_buf */
4678 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4681 (void) dmu_xuio_add(xuio
, abuf
,
4682 blksz
- preamble
, preamble
);
4685 for (i
= 0; i
< fullblk
; i
++) {
4686 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4689 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4693 /* data ends in the middle of the arc_buf */
4694 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4697 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4702 * Loan out an arc_buf for read if the read size is larger than
4703 * the current file block size. Block alignment is not
4704 * considered. Partial arc_buf will be loaned out for read.
4706 blksz
= zp
->z_blksz
;
4707 if (blksz
< zcr_blksz_min
)
4708 blksz
= zcr_blksz_min
;
4709 if (blksz
> zcr_blksz_max
)
4710 blksz
= zcr_blksz_max
;
4711 /* avoid potential complexity of dealing with it */
4712 if (blksz
> max_blksz
) {
4714 return (SET_ERROR(EINVAL
));
4717 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4723 return (SET_ERROR(EINVAL
));
4728 return (SET_ERROR(EINVAL
));
4731 uio
->uio_extflg
= UIO_XUIO
;
4732 XUIO_XUZC_RW(xuio
) = ioflag
;
4739 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4743 int ioflag
= XUIO_XUZC_RW(xuio
);
4745 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4747 i
= dmu_xuio_cnt(xuio
);
4749 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4751 * if abuf == NULL, it must be a write buffer
4752 * that has been returned in zfs_write().
4755 dmu_return_arcbuf(abuf
);
4756 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4759 dmu_xuio_fini(xuio
);
4762 #endif /* HAVE_UIO_ZEROCOPY */
4764 #if defined(_KERNEL) && defined(HAVE_SPL)
4765 module_param(zfs_delete_blocks
, ulong
, 0644);
4766 MODULE_PARM_DESC(zfs_delete_blocks
, "Delete files larger than N blocks async");
4767 module_param(zfs_read_chunk_size
, long, 0644);
4768 MODULE_PARM_DESC(zfs_read_chunk_size
, "Bytes to read per chunk");