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_SIZE
-1);
337 for (start
&= PAGE_MASK
; len
> 0; start
+= PAGE_SIZE
) {
338 nbytes
= MIN(PAGE_SIZE
- off
, len
);
340 pp
= find_lock_page(mp
, start
>> PAGE_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
);
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_SIZE
-1);
389 for (start
&= PAGE_MASK
; len
> 0; start
+= PAGE_SIZE
) {
390 bytes
= MIN(PAGE_SIZE
- off
, len
);
392 pp
= find_lock_page(mp
, start
>> PAGE_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
);
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
->z_range_lock
, uio
->uio_loffset
, uio
->uio_resid
,
490 * If we are reading past end-of-file we can skip
491 * to the end; but we might still need to set atime.
493 if (uio
->uio_loffset
>= zp
->z_size
) {
498 ASSERT(uio
->uio_loffset
< zp
->z_size
);
499 n
= MIN(uio
->uio_resid
, zp
->z_size
- uio
->uio_loffset
);
501 #ifdef HAVE_UIO_ZEROCOPY
502 if ((uio
->uio_extflg
== UIO_XUIO
) &&
503 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
)) {
505 int blksz
= zp
->z_blksz
;
506 uint64_t offset
= uio
->uio_loffset
;
508 xuio
= (xuio_t
*)uio
;
510 nblk
= (P2ROUNDUP(offset
+ n
, blksz
) - P2ALIGN(offset
,
513 ASSERT(offset
+ n
<= blksz
);
516 (void) dmu_xuio_init(xuio
, nblk
);
518 if (vn_has_cached_data(ip
)) {
520 * For simplicity, we always allocate a full buffer
521 * even if we only expect to read a portion of a block.
523 while (--nblk
>= 0) {
524 (void) dmu_xuio_add(xuio
,
525 dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
530 #endif /* HAVE_UIO_ZEROCOPY */
533 nbytes
= MIN(n
, zfs_read_chunk_size
-
534 P2PHASE(uio
->uio_loffset
, zfs_read_chunk_size
));
536 if (zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
)) {
537 error
= mappedread(ip
, nbytes
, uio
);
539 error
= dmu_read_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
544 /* convert checksum errors into IO errors */
546 error
= SET_ERROR(EIO
);
553 zfs_range_unlock(rl
);
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
->z_range_lock
, 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
->z_range_lock
, 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
);
881 * Update the file size (zp_size) if it has changed;
882 * account for possible concurrent updates.
884 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
885 (void) atomic_cas_64(&zp
->z_size
, end_size
,
890 * If we are replaying and eof is non zero then force
891 * the file size to the specified eof. Note, there's no
892 * concurrency during replay.
894 if (zsb
->z_replay
&& zsb
->z_replay_eof
!= 0)
895 zp
->z_size
= zsb
->z_replay_eof
;
897 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
899 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
,
905 ASSERT(tx_bytes
== nbytes
);
909 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
912 zfs_inode_update(zp
);
913 zfs_range_unlock(rl
);
916 * If we're in replay mode, or we made no progress, return error.
917 * Otherwise, it's at least a partial write, so it's successful.
919 if (zsb
->z_replay
|| uio
->uio_resid
== start_resid
) {
924 if (ioflag
& (FSYNC
| FDSYNC
) ||
925 zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
926 zil_commit(zilog
, zp
->z_id
);
931 EXPORT_SYMBOL(zfs_write
);
934 zfs_iput_async(struct inode
*ip
)
936 objset_t
*os
= ITOZSB(ip
)->z_os
;
938 ASSERT(atomic_read(&ip
->i_count
) > 0);
941 if (atomic_read(&ip
->i_count
) == 1)
942 taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os
)),
943 (task_func_t
*)iput
, ip
, TQ_SLEEP
);
949 zfs_get_done(zgd_t
*zgd
, int error
)
951 znode_t
*zp
= zgd
->zgd_private
;
954 dmu_buf_rele(zgd
->zgd_db
, zgd
);
956 zfs_range_unlock(zgd
->zgd_rl
);
959 * Release the vnode asynchronously as we currently have the
960 * txg stopped from syncing.
962 zfs_iput_async(ZTOI(zp
));
964 if (error
== 0 && zgd
->zgd_bp
)
965 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
967 kmem_free(zgd
, sizeof (zgd_t
));
971 static int zil_fault_io
= 0;
975 * Get data to generate a TX_WRITE intent log record.
978 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
981 objset_t
*os
= zsb
->z_os
;
983 uint64_t object
= lr
->lr_foid
;
984 uint64_t offset
= lr
->lr_offset
;
985 uint64_t size
= lr
->lr_length
;
986 blkptr_t
*bp
= &lr
->lr_blkptr
;
995 * Nothing to do if the file has been removed
997 if (zfs_zget(zsb
, object
, &zp
) != 0)
998 return (SET_ERROR(ENOENT
));
999 if (zp
->z_unlinked
) {
1001 * Release the vnode asynchronously as we currently have the
1002 * txg stopped from syncing.
1004 zfs_iput_async(ZTOI(zp
));
1005 return (SET_ERROR(ENOENT
));
1008 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_SLEEP
);
1009 zgd
->zgd_zilog
= zsb
->z_log
;
1010 zgd
->zgd_private
= zp
;
1013 * Write records come in two flavors: immediate and indirect.
1014 * For small writes it's cheaper to store the data with the
1015 * log record (immediate); for large writes it's cheaper to
1016 * sync the data and get a pointer to it (indirect) so that
1017 * we don't have to write the data twice.
1019 if (buf
!= NULL
) { /* immediate write */
1020 zgd
->zgd_rl
= zfs_range_lock(&zp
->z_range_lock
, offset
, size
,
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
->z_range_lock
, offset
,
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
, int flags
)
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
;
1536 boolean_t waited
= B_FALSE
;
1542 if (flags
& FIGNORECASE
) {
1552 * Attempt to lock directory; fail if entry doesn't exist.
1554 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1564 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1569 * Need to use rmdir for removing directories.
1571 if (S_ISDIR(ip
->i_mode
)) {
1572 error
= SET_ERROR(EPERM
);
1578 dnlc_remove(dvp
, realnmp
->pn_buf
);
1580 dnlc_remove(dvp
, name
);
1581 #endif /* HAVE_DNLC */
1583 mutex_enter(&zp
->z_lock
);
1584 may_delete_now
= atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
);
1585 mutex_exit(&zp
->z_lock
);
1588 * We may delete the znode now, or we may put it in the unlinked set;
1589 * it depends on whether we're the last link, and on whether there are
1590 * other holds on the inode. So we dmu_tx_hold() the right things to
1591 * allow for either case.
1594 tx
= dmu_tx_create(zsb
->z_os
);
1595 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1596 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1597 zfs_sa_upgrade_txholds(tx
, zp
);
1598 zfs_sa_upgrade_txholds(tx
, dzp
);
1599 if (may_delete_now
) {
1600 toobig
= zp
->z_size
> zp
->z_blksz
* zfs_delete_blocks
;
1601 /* if the file is too big, only hold_free a token amount */
1602 dmu_tx_hold_free(tx
, zp
->z_id
, 0,
1603 (toobig
? DMU_MAX_ACCESS
: DMU_OBJECT_END
));
1606 /* are there any extended attributes? */
1607 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1608 &xattr_obj
, sizeof (xattr_obj
));
1609 if (error
== 0 && xattr_obj
) {
1610 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
1612 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1613 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1616 mutex_enter(&zp
->z_lock
);
1617 if ((acl_obj
= zfs_external_acl(zp
)) != 0 && may_delete_now
)
1618 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
1619 mutex_exit(&zp
->z_lock
);
1621 /* charge as an update -- would be nice not to charge at all */
1622 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1625 * Mark this transaction as typically resulting in a net free of space
1627 dmu_tx_mark_netfree(tx
);
1629 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1631 zfs_dirent_unlock(dl
);
1635 if (error
== ERESTART
) {
1649 * Remove the directory entry.
1651 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1660 * Hold z_lock so that we can make sure that the ACL obj
1661 * hasn't changed. Could have been deleted due to
1664 mutex_enter(&zp
->z_lock
);
1665 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1666 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1667 delete_now
= may_delete_now
&& !toobig
&&
1668 atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
) &&
1669 xattr_obj
== xattr_obj_unlinked
&& zfs_external_acl(zp
) ==
1674 if (xattr_obj_unlinked
) {
1675 ASSERT3U(xzp
->z_links
, ==, 2);
1676 mutex_enter(&xzp
->z_lock
);
1677 xzp
->z_unlinked
= 1;
1679 error
= sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zsb
),
1680 &xzp
->z_links
, sizeof (xzp
->z_links
), tx
);
1681 ASSERT3U(error
, ==, 0);
1682 mutex_exit(&xzp
->z_lock
);
1683 zfs_unlinked_add(xzp
, tx
);
1686 error
= sa_remove(zp
->z_sa_hdl
,
1687 SA_ZPL_XATTR(zsb
), tx
);
1689 error
= sa_update(zp
->z_sa_hdl
,
1690 SA_ZPL_XATTR(zsb
), &null_xattr
,
1691 sizeof (uint64_t), tx
);
1695 * Add to the unlinked set because a new reference could be
1696 * taken concurrently resulting in a deferred destruction.
1698 zfs_unlinked_add(zp
, tx
);
1699 mutex_exit(&zp
->z_lock
);
1700 zfs_inode_update(zp
);
1702 } else if (unlinked
) {
1703 mutex_exit(&zp
->z_lock
);
1704 zfs_unlinked_add(zp
, tx
);
1708 if (flags
& FIGNORECASE
)
1710 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1717 zfs_dirent_unlock(dl
);
1718 zfs_inode_update(dzp
);
1721 zfs_inode_update(zp
);
1726 zfs_inode_update(xzp
);
1727 zfs_iput_async(ZTOI(xzp
));
1730 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1731 zil_commit(zilog
, 0);
1736 EXPORT_SYMBOL(zfs_remove
);
1739 * Create a new directory and insert it into dip using the name
1740 * provided. Return a pointer to the inserted directory.
1742 * IN: dip - inode of directory to add subdir to.
1743 * dirname - name of new directory.
1744 * vap - attributes of new directory.
1745 * cr - credentials of caller.
1746 * vsecp - ACL to be set
1748 * OUT: ipp - inode of created directory.
1750 * RETURN: 0 if success
1751 * error code if failure
1754 * dip - ctime|mtime updated
1755 * ipp - ctime|mtime|atime updated
1759 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1760 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1762 znode_t
*zp
, *dzp
= ITOZ(dip
);
1763 zfs_sb_t
*zsb
= ITOZSB(dip
);
1771 gid_t gid
= crgetgid(cr
);
1772 zfs_acl_ids_t acl_ids
;
1773 boolean_t fuid_dirtied
;
1774 boolean_t waited
= B_FALSE
;
1776 ASSERT(S_ISDIR(vap
->va_mode
));
1779 * If we have an ephemeral id, ACL, or XVATTR then
1780 * make sure file system is at proper version
1784 if (zsb
->z_use_fuids
== B_FALSE
&&
1785 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1786 return (SET_ERROR(EINVAL
));
1792 if (dzp
->z_pflags
& ZFS_XATTR
) {
1794 return (SET_ERROR(EINVAL
));
1797 if (zsb
->z_utf8
&& u8_validate(dirname
,
1798 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1800 return (SET_ERROR(EILSEQ
));
1802 if (flags
& FIGNORECASE
)
1805 if (vap
->va_mask
& ATTR_XVATTR
) {
1806 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1807 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1813 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1814 vsecp
, &acl_ids
)) != 0) {
1819 * First make sure the new directory doesn't exist.
1821 * Existence is checked first to make sure we don't return
1822 * EACCES instead of EEXIST which can cause some applications
1828 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1830 zfs_acl_ids_free(&acl_ids
);
1835 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1836 zfs_acl_ids_free(&acl_ids
);
1837 zfs_dirent_unlock(dl
);
1842 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1843 zfs_acl_ids_free(&acl_ids
);
1844 zfs_dirent_unlock(dl
);
1846 return (SET_ERROR(EDQUOT
));
1850 * Add a new entry to the directory.
1852 tx
= dmu_tx_create(zsb
->z_os
);
1853 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
1854 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
1855 fuid_dirtied
= zsb
->z_fuid_dirty
;
1857 zfs_fuid_txhold(zsb
, tx
);
1858 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1859 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
1860 acl_ids
.z_aclp
->z_acl_bytes
);
1863 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1864 ZFS_SA_BASE_ATTR_SIZE
);
1866 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1868 zfs_dirent_unlock(dl
);
1869 if (error
== ERESTART
) {
1875 zfs_acl_ids_free(&acl_ids
);
1884 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1887 zfs_fuid_sync(zsb
, tx
);
1890 * Now put new name in parent dir.
1892 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1896 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
1897 if (flags
& FIGNORECASE
)
1899 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
1900 acl_ids
.z_fuidp
, vap
);
1902 zfs_acl_ids_free(&acl_ids
);
1906 zfs_dirent_unlock(dl
);
1908 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1909 zil_commit(zilog
, 0);
1911 zfs_inode_update(dzp
);
1912 zfs_inode_update(zp
);
1916 EXPORT_SYMBOL(zfs_mkdir
);
1919 * Remove a directory subdir entry. If the current working
1920 * directory is the same as the subdir to be removed, the
1923 * IN: dip - inode of directory to remove from.
1924 * name - name of directory to be removed.
1925 * cwd - inode of current working directory.
1926 * cr - credentials of caller.
1927 * flags - case flags
1929 * RETURN: 0 on success, error code on failure.
1932 * dip - ctime|mtime updated
1936 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
1939 znode_t
*dzp
= ITOZ(dip
);
1942 zfs_sb_t
*zsb
= ITOZSB(dip
);
1948 boolean_t waited
= B_FALSE
;
1954 if (flags
& FIGNORECASE
)
1960 * Attempt to lock directory; fail if entry doesn't exist.
1962 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1970 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1974 if (!S_ISDIR(ip
->i_mode
)) {
1975 error
= SET_ERROR(ENOTDIR
);
1980 error
= SET_ERROR(EINVAL
);
1985 * Grab a lock on the directory to make sure that noone is
1986 * trying to add (or lookup) entries while we are removing it.
1988 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
1991 * Grab a lock on the parent pointer to make sure we play well
1992 * with the treewalk and directory rename code.
1994 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
1996 tx
= dmu_tx_create(zsb
->z_os
);
1997 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1998 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1999 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
2000 zfs_sa_upgrade_txholds(tx
, zp
);
2001 zfs_sa_upgrade_txholds(tx
, dzp
);
2002 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
2004 rw_exit(&zp
->z_parent_lock
);
2005 rw_exit(&zp
->z_name_lock
);
2006 zfs_dirent_unlock(dl
);
2008 if (error
== ERESTART
) {
2019 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
2022 uint64_t txtype
= TX_RMDIR
;
2023 if (flags
& FIGNORECASE
)
2025 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
2030 rw_exit(&zp
->z_parent_lock
);
2031 rw_exit(&zp
->z_name_lock
);
2033 zfs_dirent_unlock(dl
);
2035 zfs_inode_update(dzp
);
2036 zfs_inode_update(zp
);
2039 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2040 zil_commit(zilog
, 0);
2045 EXPORT_SYMBOL(zfs_rmdir
);
2048 * Read as many directory entries as will fit into the provided
2049 * dirent buffer from the given directory cursor position.
2051 * IN: ip - inode of directory to read.
2052 * dirent - buffer for directory entries.
2054 * OUT: dirent - filler buffer of directory entries.
2056 * RETURN: 0 if success
2057 * error code if failure
2060 * ip - atime updated
2062 * Note that the low 4 bits of the cookie returned by zap is always zero.
2063 * This allows us to use the low range for "special" directory entries:
2064 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2065 * we use the offset 2 for the '.zfs' directory.
2069 zfs_readdir(struct inode
*ip
, struct dir_context
*ctx
, cred_t
*cr
)
2071 znode_t
*zp
= ITOZ(ip
);
2072 zfs_sb_t
*zsb
= ITOZSB(ip
);
2075 zap_attribute_t zap
;
2081 uint64_t offset
; /* must be unsigned; checks for < 1 */
2086 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
2087 &parent
, sizeof (parent
))) != 0)
2091 * Quit if directory has been removed (posix)
2099 prefetch
= zp
->z_zn_prefetch
;
2102 * Initialize the iterator cursor.
2106 * Start iteration from the beginning of the directory.
2108 zap_cursor_init(&zc
, os
, zp
->z_id
);
2111 * The offset is a serialized cursor.
2113 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, offset
);
2117 * Transform to file-system independent format
2122 * Special case `.', `..', and `.zfs'.
2125 (void) strcpy(zap
.za_name
, ".");
2126 zap
.za_normalization_conflict
= 0;
2129 } else if (offset
== 1) {
2130 (void) strcpy(zap
.za_name
, "..");
2131 zap
.za_normalization_conflict
= 0;
2134 } else if (offset
== 2 && zfs_show_ctldir(zp
)) {
2135 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
2136 zap
.za_normalization_conflict
= 0;
2137 objnum
= ZFSCTL_INO_ROOT
;
2143 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
2144 if (error
== ENOENT
)
2151 * Allow multiple entries provided the first entry is
2152 * the object id. Non-zpl consumers may safely make
2153 * use of the additional space.
2155 * XXX: This should be a feature flag for compatibility
2157 if (zap
.za_integer_length
!= 8 ||
2158 zap
.za_num_integers
== 0) {
2159 cmn_err(CE_WARN
, "zap_readdir: bad directory "
2160 "entry, obj = %lld, offset = %lld, "
2161 "length = %d, num = %lld\n",
2162 (u_longlong_t
)zp
->z_id
,
2163 (u_longlong_t
)offset
,
2164 zap
.za_integer_length
,
2165 (u_longlong_t
)zap
.za_num_integers
);
2166 error
= SET_ERROR(ENXIO
);
2170 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
2171 type
= ZFS_DIRENT_TYPE(zap
.za_first_integer
);
2174 done
= !dir_emit(ctx
, zap
.za_name
, strlen(zap
.za_name
),
2179 /* Prefetch znode */
2181 dmu_prefetch(os
, objnum
, 0, 0, 0,
2182 ZIO_PRIORITY_SYNC_READ
);
2186 * Move to the next entry, fill in the previous offset.
2188 if (offset
> 2 || (offset
== 2 && !zfs_show_ctldir(zp
))) {
2189 zap_cursor_advance(&zc
);
2190 offset
= zap_cursor_serialize(&zc
);
2196 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
2199 zap_cursor_fini(&zc
);
2200 if (error
== ENOENT
)
2207 EXPORT_SYMBOL(zfs_readdir
);
2209 ulong_t zfs_fsync_sync_cnt
= 4;
2212 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2214 znode_t
*zp
= ITOZ(ip
);
2215 zfs_sb_t
*zsb
= ITOZSB(ip
);
2217 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2219 if (zsb
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2222 zil_commit(zsb
->z_log
, zp
->z_id
);
2225 tsd_set(zfs_fsyncer_key
, NULL
);
2229 EXPORT_SYMBOL(zfs_fsync
);
2233 * Get the requested file attributes and place them in the provided
2236 * IN: ip - inode of file.
2237 * vap - va_mask identifies requested attributes.
2238 * If ATTR_XVATTR set, then optional attrs are requested
2239 * flags - ATTR_NOACLCHECK (CIFS server context)
2240 * cr - credentials of caller.
2242 * OUT: vap - attribute values.
2244 * RETURN: 0 (always succeeds)
2248 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2250 znode_t
*zp
= ITOZ(ip
);
2251 zfs_sb_t
*zsb
= ITOZSB(ip
);
2254 uint64_t atime
[2], mtime
[2], ctime
[2];
2255 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2256 xoptattr_t
*xoap
= NULL
;
2257 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2258 sa_bulk_attr_t bulk
[3];
2264 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2266 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
, &atime
, 16);
2267 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
2268 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
2270 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2276 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2277 * Also, if we are the owner don't bother, since owner should
2278 * always be allowed to read basic attributes of file.
2280 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2281 (vap
->va_uid
!= crgetuid(cr
))) {
2282 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2290 * Return all attributes. It's cheaper to provide the answer
2291 * than to determine whether we were asked the question.
2294 mutex_enter(&zp
->z_lock
);
2295 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2296 vap
->va_mode
= zp
->z_mode
;
2297 vap
->va_fsid
= ZTOI(zp
)->i_sb
->s_dev
;
2298 vap
->va_nodeid
= zp
->z_id
;
2299 if ((zp
->z_id
== zsb
->z_root
) && zfs_show_ctldir(zp
))
2300 links
= zp
->z_links
+ 1;
2302 links
= zp
->z_links
;
2303 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2304 vap
->va_size
= i_size_read(ip
);
2305 vap
->va_rdev
= ip
->i_rdev
;
2306 vap
->va_seq
= ip
->i_generation
;
2309 * Add in any requested optional attributes and the create time.
2310 * Also set the corresponding bits in the returned attribute bitmap.
2312 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zsb
->z_use_fuids
) {
2313 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2315 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2316 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2319 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2320 xoap
->xoa_readonly
=
2321 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2322 XVA_SET_RTN(xvap
, XAT_READONLY
);
2325 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2327 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2328 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2331 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2333 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2334 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2337 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2338 xoap
->xoa_nounlink
=
2339 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2340 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2343 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2344 xoap
->xoa_immutable
=
2345 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2346 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2349 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2350 xoap
->xoa_appendonly
=
2351 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2352 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2355 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2357 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2358 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2361 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2363 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2364 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2367 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2368 xoap
->xoa_av_quarantined
=
2369 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2370 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2373 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2374 xoap
->xoa_av_modified
=
2375 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2376 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2379 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2380 S_ISREG(ip
->i_mode
)) {
2381 zfs_sa_get_scanstamp(zp
, xvap
);
2384 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2387 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zsb
),
2388 times
, sizeof (times
));
2389 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2390 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2393 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2394 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2395 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2397 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2398 xoap
->xoa_generation
= zp
->z_gen
;
2399 XVA_SET_RTN(xvap
, XAT_GEN
);
2402 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2404 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2405 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2408 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2410 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2411 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2415 ZFS_TIME_DECODE(&vap
->va_atime
, atime
);
2416 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2417 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2419 mutex_exit(&zp
->z_lock
);
2421 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2423 if (zp
->z_blksz
== 0) {
2425 * Block size hasn't been set; suggest maximal I/O transfers.
2427 vap
->va_blksize
= zsb
->z_max_blksz
;
2433 EXPORT_SYMBOL(zfs_getattr
);
2436 * Get the basic file attributes and place them in the provided kstat
2437 * structure. The inode is assumed to be the authoritative source
2438 * for most of the attributes. However, the znode currently has the
2439 * authoritative atime, blksize, and block count.
2441 * IN: ip - inode of file.
2443 * OUT: sp - kstat values.
2445 * RETURN: 0 (always succeeds)
2449 zfs_getattr_fast(struct inode
*ip
, struct kstat
*sp
)
2451 znode_t
*zp
= ITOZ(ip
);
2452 zfs_sb_t
*zsb
= ITOZSB(ip
);
2454 u_longlong_t nblocks
;
2459 mutex_enter(&zp
->z_lock
);
2461 generic_fillattr(ip
, sp
);
2463 sa_object_size(zp
->z_sa_hdl
, &blksize
, &nblocks
);
2464 sp
->blksize
= blksize
;
2465 sp
->blocks
= nblocks
;
2467 if (unlikely(zp
->z_blksz
== 0)) {
2469 * Block size hasn't been set; suggest maximal I/O transfers.
2471 sp
->blksize
= zsb
->z_max_blksz
;
2474 mutex_exit(&zp
->z_lock
);
2477 * Required to prevent NFS client from detecting different inode
2478 * numbers of snapshot root dentry before and after snapshot mount.
2480 if (zsb
->z_issnap
) {
2481 if (ip
->i_sb
->s_root
->d_inode
== ip
)
2482 sp
->ino
= ZFSCTL_INO_SNAPDIRS
-
2483 dmu_objset_id(zsb
->z_os
);
2490 EXPORT_SYMBOL(zfs_getattr_fast
);
2493 * Set the file attributes to the values contained in the
2496 * IN: ip - inode of file to be modified.
2497 * vap - new attribute values.
2498 * If ATTR_XVATTR set, then optional attrs are being set
2499 * flags - ATTR_UTIME set if non-default time values provided.
2500 * - ATTR_NOACLCHECK (CIFS context only).
2501 * cr - credentials of caller.
2503 * RETURN: 0 if success
2504 * error code if failure
2507 * ip - ctime updated, mtime updated if size changed.
2511 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2513 znode_t
*zp
= ITOZ(ip
);
2514 zfs_sb_t
*zsb
= ITOZSB(ip
);
2518 xvattr_t
*tmpxvattr
;
2519 uint_t mask
= vap
->va_mask
;
2520 uint_t saved_mask
= 0;
2523 uint64_t new_uid
, new_gid
;
2525 uint64_t mtime
[2], ctime
[2], atime
[2];
2527 int need_policy
= FALSE
;
2529 zfs_fuid_info_t
*fuidp
= NULL
;
2530 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2533 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2534 boolean_t fuid_dirtied
= B_FALSE
;
2535 sa_bulk_attr_t
*bulk
, *xattr_bulk
;
2536 int count
= 0, xattr_count
= 0;
2547 * Make sure that if we have ephemeral uid/gid or xvattr specified
2548 * that file system is at proper version level
2551 if (zsb
->z_use_fuids
== B_FALSE
&&
2552 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2553 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2554 (mask
& ATTR_XVATTR
))) {
2556 return (SET_ERROR(EINVAL
));
2559 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2561 return (SET_ERROR(EISDIR
));
2564 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2566 return (SET_ERROR(EINVAL
));
2570 * If this is an xvattr_t, then get a pointer to the structure of
2571 * optional attributes. If this is NULL, then we have a vattr_t.
2573 xoap
= xva_getxoptattr(xvap
);
2575 tmpxvattr
= kmem_alloc(sizeof (xvattr_t
), KM_SLEEP
);
2576 xva_init(tmpxvattr
);
2578 bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2579 xattr_bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2582 * Immutable files can only alter immutable bit and atime
2584 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2585 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2586 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2591 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2597 * Verify timestamps doesn't overflow 32 bits.
2598 * ZFS can handle large timestamps, but 32bit syscalls can't
2599 * handle times greater than 2039. This check should be removed
2600 * once large timestamps are fully supported.
2602 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2603 if (((mask
& ATTR_ATIME
) &&
2604 TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2605 ((mask
& ATTR_MTIME
) &&
2606 TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2616 /* Can this be moved to before the top label? */
2617 if (zfs_is_readonly(zsb
)) {
2623 * First validate permissions
2626 if (mask
& ATTR_SIZE
) {
2627 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2632 * XXX - Note, we are not providing any open
2633 * mode flags here (like FNDELAY), so we may
2634 * block if there are locks present... this
2635 * should be addressed in openat().
2637 /* XXX - would it be OK to generate a log record here? */
2638 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2643 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2644 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2645 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2646 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2647 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2648 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2649 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2650 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2651 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2655 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2656 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2661 * NOTE: even if a new mode is being set,
2662 * we may clear S_ISUID/S_ISGID bits.
2665 if (!(mask
& ATTR_MODE
))
2666 vap
->va_mode
= zp
->z_mode
;
2669 * Take ownership or chgrp to group we are a member of
2672 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2673 take_group
= (mask
& ATTR_GID
) &&
2674 zfs_groupmember(zsb
, vap
->va_gid
, cr
);
2677 * If both ATTR_UID and ATTR_GID are set then take_owner and
2678 * take_group must both be set in order to allow taking
2681 * Otherwise, send the check through secpolicy_vnode_setattr()
2685 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2686 take_owner
&& take_group
) ||
2687 ((idmask
== ATTR_UID
) && take_owner
) ||
2688 ((idmask
== ATTR_GID
) && take_group
)) {
2689 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2690 skipaclchk
, cr
) == 0) {
2692 * Remove setuid/setgid for non-privileged users
2694 (void) secpolicy_setid_clear(vap
, cr
);
2695 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2704 mutex_enter(&zp
->z_lock
);
2705 oldva
.va_mode
= zp
->z_mode
;
2706 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2707 if (mask
& ATTR_XVATTR
) {
2709 * Update xvattr mask to include only those attributes
2710 * that are actually changing.
2712 * the bits will be restored prior to actually setting
2713 * the attributes so the caller thinks they were set.
2715 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2716 if (xoap
->xoa_appendonly
!=
2717 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2720 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2721 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2725 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2726 if (xoap
->xoa_nounlink
!=
2727 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2730 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2731 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2735 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2736 if (xoap
->xoa_immutable
!=
2737 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2740 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2741 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2745 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2746 if (xoap
->xoa_nodump
!=
2747 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2750 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2751 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2755 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2756 if (xoap
->xoa_av_modified
!=
2757 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2760 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2761 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2765 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2766 if ((!S_ISREG(ip
->i_mode
) &&
2767 xoap
->xoa_av_quarantined
) ||
2768 xoap
->xoa_av_quarantined
!=
2769 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2772 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2773 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2777 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2778 mutex_exit(&zp
->z_lock
);
2783 if (need_policy
== FALSE
&&
2784 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2785 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2790 mutex_exit(&zp
->z_lock
);
2792 if (mask
& ATTR_MODE
) {
2793 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2794 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2799 trim_mask
|= ATTR_MODE
;
2807 * If trim_mask is set then take ownership
2808 * has been granted or write_acl is present and user
2809 * has the ability to modify mode. In that case remove
2810 * UID|GID and or MODE from mask so that
2811 * secpolicy_vnode_setattr() doesn't revoke it.
2815 saved_mask
= vap
->va_mask
;
2816 vap
->va_mask
&= ~trim_mask
;
2818 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2819 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2824 vap
->va_mask
|= saved_mask
;
2828 * secpolicy_vnode_setattr, or take ownership may have
2831 mask
= vap
->va_mask
;
2833 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2834 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
2835 &xattr_obj
, sizeof (xattr_obj
));
2837 if (err
== 0 && xattr_obj
) {
2838 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
2842 if (mask
& ATTR_UID
) {
2843 new_uid
= zfs_fuid_create(zsb
,
2844 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
2845 if (new_uid
!= zp
->z_uid
&&
2846 zfs_fuid_overquota(zsb
, B_FALSE
, new_uid
)) {
2854 if (mask
& ATTR_GID
) {
2855 new_gid
= zfs_fuid_create(zsb
, (uint64_t)vap
->va_gid
,
2856 cr
, ZFS_GROUP
, &fuidp
);
2857 if (new_gid
!= zp
->z_gid
&&
2858 zfs_fuid_overquota(zsb
, B_TRUE
, new_gid
)) {
2866 tx
= dmu_tx_create(zsb
->z_os
);
2868 if (mask
& ATTR_MODE
) {
2869 uint64_t pmode
= zp
->z_mode
;
2871 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
2873 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
2875 mutex_enter(&zp
->z_lock
);
2876 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
2878 * Are we upgrading ACL from old V0 format
2881 if (zsb
->z_version
>= ZPL_VERSION_FUID
&&
2882 zfs_znode_acl_version(zp
) ==
2883 ZFS_ACL_VERSION_INITIAL
) {
2884 dmu_tx_hold_free(tx
, acl_obj
, 0,
2886 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2887 0, aclp
->z_acl_bytes
);
2889 dmu_tx_hold_write(tx
, acl_obj
, 0,
2892 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
2893 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2894 0, aclp
->z_acl_bytes
);
2896 mutex_exit(&zp
->z_lock
);
2897 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2899 if ((mask
& ATTR_XVATTR
) &&
2900 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2901 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2903 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2907 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
2910 fuid_dirtied
= zsb
->z_fuid_dirty
;
2912 zfs_fuid_txhold(zsb
, tx
);
2914 zfs_sa_upgrade_txholds(tx
, zp
);
2916 err
= dmu_tx_assign(tx
, TXG_WAIT
);
2922 * Set each attribute requested.
2923 * We group settings according to the locks they need to acquire.
2925 * Note: you cannot set ctime directly, although it will be
2926 * updated as a side-effect of calling this function.
2930 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2931 mutex_enter(&zp
->z_acl_lock
);
2932 mutex_enter(&zp
->z_lock
);
2934 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
2935 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
2938 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2939 mutex_enter(&attrzp
->z_acl_lock
);
2940 mutex_enter(&attrzp
->z_lock
);
2941 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2942 SA_ZPL_FLAGS(zsb
), NULL
, &attrzp
->z_pflags
,
2943 sizeof (attrzp
->z_pflags
));
2946 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2948 if (mask
& ATTR_UID
) {
2949 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zsb
), NULL
,
2950 &new_uid
, sizeof (new_uid
));
2951 zp
->z_uid
= new_uid
;
2953 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2954 SA_ZPL_UID(zsb
), NULL
, &new_uid
,
2956 attrzp
->z_uid
= new_uid
;
2960 if (mask
& ATTR_GID
) {
2961 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zsb
),
2962 NULL
, &new_gid
, sizeof (new_gid
));
2963 zp
->z_gid
= new_gid
;
2965 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2966 SA_ZPL_GID(zsb
), NULL
, &new_gid
,
2968 attrzp
->z_gid
= new_gid
;
2971 if (!(mask
& ATTR_MODE
)) {
2972 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
),
2973 NULL
, &new_mode
, sizeof (new_mode
));
2974 new_mode
= zp
->z_mode
;
2976 err
= zfs_acl_chown_setattr(zp
);
2979 err
= zfs_acl_chown_setattr(attrzp
);
2984 if (mask
& ATTR_MODE
) {
2985 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
), NULL
,
2986 &new_mode
, sizeof (new_mode
));
2987 zp
->z_mode
= new_mode
;
2988 ASSERT3P(aclp
, !=, NULL
);
2989 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
2991 if (zp
->z_acl_cached
)
2992 zfs_acl_free(zp
->z_acl_cached
);
2993 zp
->z_acl_cached
= aclp
;
2998 if ((mask
& ATTR_ATIME
) || zp
->z_atime_dirty
) {
2999 zp
->z_atime_dirty
= 0;
3000 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
3001 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
,
3002 &atime
, sizeof (atime
));
3005 if (mask
& ATTR_MTIME
) {
3006 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
3007 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
3008 mtime
, sizeof (mtime
));
3011 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
3012 if (mask
& ATTR_SIZE
&& !(mask
& ATTR_MTIME
)) {
3013 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
3014 NULL
, mtime
, sizeof (mtime
));
3015 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
3016 &ctime
, sizeof (ctime
));
3017 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
);
3018 } else if (mask
!= 0) {
3019 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
3020 &ctime
, sizeof (ctime
));
3021 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
);
3023 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3024 SA_ZPL_CTIME(zsb
), NULL
,
3025 &ctime
, sizeof (ctime
));
3026 zfs_tstamp_update_setup(attrzp
, STATE_CHANGED
,
3031 * Do this after setting timestamps to prevent timestamp
3032 * update from toggling bit
3035 if (xoap
&& (mask
& ATTR_XVATTR
)) {
3038 * restore trimmed off masks
3039 * so that return masks can be set for caller.
3042 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
3043 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
3045 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
3046 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
3048 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
3049 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
3051 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
3052 XVA_SET_REQ(xvap
, XAT_NODUMP
);
3054 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
3055 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
3057 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
3058 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
3061 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
3062 ASSERT(S_ISREG(ip
->i_mode
));
3064 zfs_xvattr_set(zp
, xvap
, tx
);
3068 zfs_fuid_sync(zsb
, tx
);
3071 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
3073 mutex_exit(&zp
->z_lock
);
3074 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3075 mutex_exit(&zp
->z_acl_lock
);
3078 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3079 mutex_exit(&attrzp
->z_acl_lock
);
3080 mutex_exit(&attrzp
->z_lock
);
3083 if (err
== 0 && attrzp
) {
3084 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
3095 zfs_fuid_info_free(fuidp
);
3101 if (err
== ERESTART
)
3104 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
3106 zfs_inode_update(zp
);
3110 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3111 zil_commit(zilog
, 0);
3114 kmem_free(xattr_bulk
, sizeof (sa_bulk_attr_t
) * 7);
3115 kmem_free(bulk
, sizeof (sa_bulk_attr_t
) * 7);
3116 kmem_free(tmpxvattr
, sizeof (xvattr_t
));
3120 EXPORT_SYMBOL(zfs_setattr
);
3122 typedef struct zfs_zlock
{
3123 krwlock_t
*zl_rwlock
; /* lock we acquired */
3124 znode_t
*zl_znode
; /* znode we held */
3125 struct zfs_zlock
*zl_next
; /* next in list */
3129 * Drop locks and release vnodes that were held by zfs_rename_lock().
3132 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
3136 while ((zl
= *zlpp
) != NULL
) {
3137 if (zl
->zl_znode
!= NULL
)
3138 iput(ZTOI(zl
->zl_znode
));
3139 rw_exit(zl
->zl_rwlock
);
3140 *zlpp
= zl
->zl_next
;
3141 kmem_free(zl
, sizeof (*zl
));
3146 * Search back through the directory tree, using the ".." entries.
3147 * Lock each directory in the chain to prevent concurrent renames.
3148 * Fail any attempt to move a directory into one of its own descendants.
3149 * XXX - z_parent_lock can overlap with map or grow locks
3152 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
3156 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
3157 uint64_t oidp
= zp
->z_id
;
3158 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
3159 krw_t rw
= RW_WRITER
;
3162 * First pass write-locks szp and compares to zp->z_id.
3163 * Later passes read-lock zp and compare to zp->z_parent.
3166 if (!rw_tryenter(rwlp
, rw
)) {
3168 * Another thread is renaming in this path.
3169 * Note that if we are a WRITER, we don't have any
3170 * parent_locks held yet.
3172 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
3174 * Drop our locks and restart
3176 zfs_rename_unlock(&zl
);
3180 rwlp
= &szp
->z_parent_lock
;
3185 * Wait for other thread to drop its locks
3191 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
3192 zl
->zl_rwlock
= rwlp
;
3193 zl
->zl_znode
= NULL
;
3194 zl
->zl_next
= *zlpp
;
3197 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
3198 return (SET_ERROR(EINVAL
));
3200 if (oidp
== rootid
) /* We've hit the top */
3203 if (rw
== RW_READER
) { /* i.e. not the first pass */
3204 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
3209 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
3210 &oidp
, sizeof (oidp
));
3211 rwlp
= &zp
->z_parent_lock
;
3214 } while (zp
->z_id
!= sdzp
->z_id
);
3220 * Move an entry from the provided source directory to the target
3221 * directory. Change the entry name as indicated.
3223 * IN: sdip - Source directory containing the "old entry".
3224 * snm - Old entry name.
3225 * tdip - Target directory to contain the "new entry".
3226 * tnm - New entry name.
3227 * cr - credentials of caller.
3228 * flags - case flags
3230 * RETURN: 0 on success, error code on failure.
3233 * sdip,tdip - ctime|mtime updated
3237 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
3238 cred_t
*cr
, int flags
)
3240 znode_t
*tdzp
, *szp
, *tzp
;
3241 znode_t
*sdzp
= ITOZ(sdip
);
3242 zfs_sb_t
*zsb
= ITOZSB(sdip
);
3244 zfs_dirlock_t
*sdl
, *tdl
;
3247 int cmp
, serr
, terr
;
3250 boolean_t waited
= B_FALSE
;
3253 ZFS_VERIFY_ZP(sdzp
);
3257 ZFS_VERIFY_ZP(tdzp
);
3260 * We check i_sb because snapshots and the ctldir must have different
3263 if (tdip
->i_sb
!= sdip
->i_sb
|| zfsctl_is_node(tdip
)) {
3265 return (SET_ERROR(EXDEV
));
3268 if (zsb
->z_utf8
&& u8_validate(tnm
,
3269 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3271 return (SET_ERROR(EILSEQ
));
3274 if (flags
& FIGNORECASE
)
3283 * This is to prevent the creation of links into attribute space
3284 * by renaming a linked file into/outof an attribute directory.
3285 * See the comment in zfs_link() for why this is considered bad.
3287 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3289 return (SET_ERROR(EINVAL
));
3293 * Lock source and target directory entries. To prevent deadlock,
3294 * a lock ordering must be defined. We lock the directory with
3295 * the smallest object id first, or if it's a tie, the one with
3296 * the lexically first name.
3298 if (sdzp
->z_id
< tdzp
->z_id
) {
3300 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3304 * First compare the two name arguments without
3305 * considering any case folding.
3307 int nofold
= (zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3309 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3310 ASSERT(error
== 0 || !zsb
->z_utf8
);
3313 * POSIX: "If the old argument and the new argument
3314 * both refer to links to the same existing file,
3315 * the rename() function shall return successfully
3316 * and perform no other action."
3322 * If the file system is case-folding, then we may
3323 * have some more checking to do. A case-folding file
3324 * system is either supporting mixed case sensitivity
3325 * access or is completely case-insensitive. Note
3326 * that the file system is always case preserving.
3328 * In mixed sensitivity mode case sensitive behavior
3329 * is the default. FIGNORECASE must be used to
3330 * explicitly request case insensitive behavior.
3332 * If the source and target names provided differ only
3333 * by case (e.g., a request to rename 'tim' to 'Tim'),
3334 * we will treat this as a special case in the
3335 * case-insensitive mode: as long as the source name
3336 * is an exact match, we will allow this to proceed as
3337 * a name-change request.
3339 if ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
||
3340 (zsb
->z_case
== ZFS_CASE_MIXED
&&
3341 flags
& FIGNORECASE
)) &&
3342 u8_strcmp(snm
, tnm
, 0, zsb
->z_norm
, U8_UNICODE_LATEST
,
3345 * case preserving rename request, require exact
3354 * If the source and destination directories are the same, we should
3355 * grab the z_name_lock of that directory only once.
3359 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3363 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3364 ZEXISTS
| zflg
, NULL
, NULL
);
3365 terr
= zfs_dirent_lock(&tdl
,
3366 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3368 terr
= zfs_dirent_lock(&tdl
,
3369 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3370 serr
= zfs_dirent_lock(&sdl
,
3371 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3377 * Source entry invalid or not there.
3380 zfs_dirent_unlock(tdl
);
3386 rw_exit(&sdzp
->z_name_lock
);
3388 if (strcmp(snm
, "..") == 0)
3394 zfs_dirent_unlock(sdl
);
3398 rw_exit(&sdzp
->z_name_lock
);
3400 if (strcmp(tnm
, "..") == 0)
3407 * Must have write access at the source to remove the old entry
3408 * and write access at the target to create the new entry.
3409 * Note that if target and source are the same, this can be
3410 * done in a single check.
3413 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3416 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3418 * Check to make sure rename is valid.
3419 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3421 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3426 * Does target exist?
3430 * Source and target must be the same type.
3432 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3433 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3434 error
= SET_ERROR(ENOTDIR
);
3438 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3439 error
= SET_ERROR(EISDIR
);
3444 * POSIX dictates that when the source and target
3445 * entries refer to the same file object, rename
3446 * must do nothing and exit without error.
3448 if (szp
->z_id
== tzp
->z_id
) {
3454 tx
= dmu_tx_create(zsb
->z_os
);
3455 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3456 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3457 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3458 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3460 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3461 zfs_sa_upgrade_txholds(tx
, tdzp
);
3464 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3465 zfs_sa_upgrade_txholds(tx
, tzp
);
3468 zfs_sa_upgrade_txholds(tx
, szp
);
3469 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
3470 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3473 zfs_rename_unlock(&zl
);
3474 zfs_dirent_unlock(sdl
);
3475 zfs_dirent_unlock(tdl
);
3478 rw_exit(&sdzp
->z_name_lock
);
3483 if (error
== ERESTART
) {
3494 if (tzp
) /* Attempt to remove the existing target */
3495 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3498 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3500 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3502 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zsb
),
3503 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3506 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3508 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3509 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3510 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3513 * At this point, we have successfully created
3514 * the target name, but have failed to remove
3515 * the source name. Since the create was done
3516 * with the ZRENAMING flag, there are
3517 * complications; for one, the link count is
3518 * wrong. The easiest way to deal with this
3519 * is to remove the newly created target, and
3520 * return the original error. This must
3521 * succeed; fortunately, it is very unlikely to
3522 * fail, since we just created it.
3524 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3525 ZRENAMING
, NULL
), ==, 0);
3533 zfs_rename_unlock(&zl
);
3535 zfs_dirent_unlock(sdl
);
3536 zfs_dirent_unlock(tdl
);
3538 zfs_inode_update(sdzp
);
3540 rw_exit(&sdzp
->z_name_lock
);
3543 zfs_inode_update(tdzp
);
3545 zfs_inode_update(szp
);
3548 zfs_inode_update(tzp
);
3552 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3553 zil_commit(zilog
, 0);
3558 EXPORT_SYMBOL(zfs_rename
);
3561 * Insert the indicated symbolic reference entry into the directory.
3563 * IN: dip - Directory to contain new symbolic link.
3564 * link - Name for new symlink entry.
3565 * vap - Attributes of new entry.
3566 * target - Target path of new symlink.
3568 * cr - credentials of caller.
3569 * flags - case flags
3571 * RETURN: 0 on success, error code on failure.
3574 * dip - ctime|mtime updated
3578 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3579 struct inode
**ipp
, cred_t
*cr
, int flags
)
3581 znode_t
*zp
, *dzp
= ITOZ(dip
);
3584 zfs_sb_t
*zsb
= ITOZSB(dip
);
3586 uint64_t len
= strlen(link
);
3589 zfs_acl_ids_t acl_ids
;
3590 boolean_t fuid_dirtied
;
3591 uint64_t txtype
= TX_SYMLINK
;
3592 boolean_t waited
= B_FALSE
;
3594 ASSERT(S_ISLNK(vap
->va_mode
));
3600 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
3601 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3603 return (SET_ERROR(EILSEQ
));
3605 if (flags
& FIGNORECASE
)
3608 if (len
> MAXPATHLEN
) {
3610 return (SET_ERROR(ENAMETOOLONG
));
3613 if ((error
= zfs_acl_ids_create(dzp
, 0,
3614 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3622 * Attempt to lock directory; fail if entry already exists.
3624 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3626 zfs_acl_ids_free(&acl_ids
);
3631 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3632 zfs_acl_ids_free(&acl_ids
);
3633 zfs_dirent_unlock(dl
);
3638 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
3639 zfs_acl_ids_free(&acl_ids
);
3640 zfs_dirent_unlock(dl
);
3642 return (SET_ERROR(EDQUOT
));
3644 tx
= dmu_tx_create(zsb
->z_os
);
3645 fuid_dirtied
= zsb
->z_fuid_dirty
;
3646 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3647 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3648 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3649 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3650 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3651 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3652 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3653 acl_ids
.z_aclp
->z_acl_bytes
);
3656 zfs_fuid_txhold(zsb
, tx
);
3657 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3659 zfs_dirent_unlock(dl
);
3660 if (error
== ERESTART
) {
3666 zfs_acl_ids_free(&acl_ids
);
3673 * Create a new object for the symlink.
3674 * for version 4 ZPL datsets the symlink will be an SA attribute
3676 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3679 zfs_fuid_sync(zsb
, tx
);
3681 mutex_enter(&zp
->z_lock
);
3683 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zsb
),
3686 zfs_sa_symlink(zp
, link
, len
, tx
);
3687 mutex_exit(&zp
->z_lock
);
3690 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
3691 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3693 * Insert the new object into the directory.
3695 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3697 if (flags
& FIGNORECASE
)
3699 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3701 zfs_inode_update(dzp
);
3702 zfs_inode_update(zp
);
3704 zfs_acl_ids_free(&acl_ids
);
3708 zfs_dirent_unlock(dl
);
3712 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3713 zil_commit(zilog
, 0);
3718 EXPORT_SYMBOL(zfs_symlink
);
3721 * Return, in the buffer contained in the provided uio structure,
3722 * the symbolic path referred to by ip.
3724 * IN: ip - inode of symbolic link
3725 * uio - structure to contain the link path.
3726 * cr - credentials of caller.
3728 * RETURN: 0 if success
3729 * error code if failure
3732 * ip - atime updated
3736 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3738 znode_t
*zp
= ITOZ(ip
);
3739 zfs_sb_t
*zsb
= ITOZSB(ip
);
3745 mutex_enter(&zp
->z_lock
);
3747 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3748 SA_ZPL_SYMLINK(zsb
), uio
);
3750 error
= zfs_sa_readlink(zp
, uio
);
3751 mutex_exit(&zp
->z_lock
);
3756 EXPORT_SYMBOL(zfs_readlink
);
3759 * Insert a new entry into directory tdip referencing sip.
3761 * IN: tdip - Directory to contain new entry.
3762 * sip - inode of new entry.
3763 * name - name of new entry.
3764 * cr - credentials of caller.
3766 * RETURN: 0 if success
3767 * error code if failure
3770 * tdip - ctime|mtime updated
3771 * sip - ctime updated
3775 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
,
3778 znode_t
*dzp
= ITOZ(tdip
);
3780 zfs_sb_t
*zsb
= ITOZSB(tdip
);
3788 boolean_t waited
= B_FALSE
;
3790 ASSERT(S_ISDIR(tdip
->i_mode
));
3797 * POSIX dictates that we return EPERM here.
3798 * Better choices include ENOTSUP or EISDIR.
3800 if (S_ISDIR(sip
->i_mode
)) {
3802 return (SET_ERROR(EPERM
));
3809 * We check i_sb because snapshots and the ctldir must have different
3812 if (sip
->i_sb
!= tdip
->i_sb
|| zfsctl_is_node(sip
)) {
3814 return (SET_ERROR(EXDEV
));
3817 /* Prevent links to .zfs/shares files */
3819 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
3820 &parent
, sizeof (uint64_t))) != 0) {
3824 if (parent
== zsb
->z_shares_dir
) {
3826 return (SET_ERROR(EPERM
));
3829 if (zsb
->z_utf8
&& u8_validate(name
,
3830 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3832 return (SET_ERROR(EILSEQ
));
3834 if (flags
& FIGNORECASE
)
3838 * We do not support links between attributes and non-attributes
3839 * because of the potential security risk of creating links
3840 * into "normal" file space in order to circumvent restrictions
3841 * imposed in attribute space.
3843 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
3845 return (SET_ERROR(EINVAL
));
3848 owner
= zfs_fuid_map_id(zsb
, szp
->z_uid
, cr
, ZFS_OWNER
);
3849 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
3851 return (SET_ERROR(EPERM
));
3854 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3861 * Attempt to lock directory; fail if entry already exists.
3863 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
3869 tx
= dmu_tx_create(zsb
->z_os
);
3870 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3871 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3872 zfs_sa_upgrade_txholds(tx
, szp
);
3873 zfs_sa_upgrade_txholds(tx
, dzp
);
3874 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3876 zfs_dirent_unlock(dl
);
3877 if (error
== ERESTART
) {
3888 error
= zfs_link_create(dl
, szp
, tx
, 0);
3891 uint64_t txtype
= TX_LINK
;
3892 if (flags
& FIGNORECASE
)
3894 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
3899 zfs_dirent_unlock(dl
);
3901 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3902 zil_commit(zilog
, 0);
3904 zfs_inode_update(dzp
);
3905 zfs_inode_update(szp
);
3909 EXPORT_SYMBOL(zfs_link
);
3912 zfs_putpage_commit_cb(void *arg
)
3914 struct page
*pp
= arg
;
3917 end_page_writeback(pp
);
3921 * Push a page out to disk, once the page is on stable storage the
3922 * registered commit callback will be run as notification of completion.
3924 * IN: ip - page mapped for inode.
3925 * pp - page to push (page is locked)
3926 * wbc - writeback control data
3928 * RETURN: 0 if success
3929 * error code if failure
3932 * ip - ctime|mtime updated
3936 zfs_putpage(struct inode
*ip
, struct page
*pp
, struct writeback_control
*wbc
)
3938 znode_t
*zp
= ITOZ(ip
);
3939 zfs_sb_t
*zsb
= ITOZSB(ip
);
3947 uint64_t mtime
[2], ctime
[2];
3948 sa_bulk_attr_t bulk
[3];
3950 struct address_space
*mapping
;
3955 ASSERT(PageLocked(pp
));
3957 pgoff
= page_offset(pp
); /* Page byte-offset in file */
3958 offset
= i_size_read(ip
); /* File length in bytes */
3959 pglen
= MIN(PAGE_SIZE
, /* Page length in bytes */
3960 P2ROUNDUP(offset
, PAGE_SIZE
)-pgoff
);
3962 /* Page is beyond end of file */
3963 if (pgoff
>= offset
) {
3969 /* Truncate page length to end of file */
3970 if (pgoff
+ pglen
> offset
)
3971 pglen
= offset
- pgoff
;
3975 * FIXME: Allow mmap writes past its quota. The correct fix
3976 * is to register a page_mkwrite() handler to count the page
3977 * against its quota when it is about to be dirtied.
3979 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
3980 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
3986 * The ordering here is critical and must adhere to the following
3987 * rules in order to avoid deadlocking in either zfs_read() or
3988 * zfs_free_range() due to a lock inversion.
3990 * 1) The page must be unlocked prior to acquiring the range lock.
3991 * This is critical because zfs_read() calls find_lock_page()
3992 * which may block on the page lock while holding the range lock.
3994 * 2) Before setting or clearing write back on a page the range lock
3995 * must be held in order to prevent a lock inversion with the
3996 * zfs_free_range() function.
3998 * This presents a problem because upon entering this function the
3999 * page lock is already held. To safely acquire the range lock the
4000 * page lock must be dropped. This creates a window where another
4001 * process could truncate, invalidate, dirty, or write out the page.
4003 * Therefore, after successfully reacquiring the range and page locks
4004 * the current page state is checked. In the common case everything
4005 * will be as is expected and it can be written out. However, if
4006 * the page state has changed it must be handled accordingly.
4008 mapping
= pp
->mapping
;
4009 redirty_page_for_writepage(wbc
, pp
);
4012 rl
= zfs_range_lock(&zp
->z_range_lock
, pgoff
, pglen
, RL_WRITER
);
4015 /* Page mapping changed or it was no longer dirty, we're done */
4016 if (unlikely((mapping
!= pp
->mapping
) || !PageDirty(pp
))) {
4018 zfs_range_unlock(rl
);
4023 /* Another process started write block if required */
4024 if (PageWriteback(pp
)) {
4026 zfs_range_unlock(rl
);
4028 if (wbc
->sync_mode
!= WB_SYNC_NONE
)
4029 wait_on_page_writeback(pp
);
4035 /* Clear the dirty flag the required locks are held */
4036 if (!clear_page_dirty_for_io(pp
)) {
4038 zfs_range_unlock(rl
);
4044 * Counterpart for redirty_page_for_writepage() above. This page
4045 * was in fact not skipped and should not be counted as if it were.
4047 wbc
->pages_skipped
--;
4048 set_page_writeback(pp
);
4051 tx
= dmu_tx_create(zsb
->z_os
);
4052 dmu_tx_hold_write(tx
, zp
->z_id
, pgoff
, pglen
);
4053 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4054 zfs_sa_upgrade_txholds(tx
, zp
);
4056 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
4058 if (err
== ERESTART
)
4062 __set_page_dirty_nobuffers(pp
);
4064 end_page_writeback(pp
);
4065 zfs_range_unlock(rl
);
4071 ASSERT3U(pglen
, <=, PAGE_SIZE
);
4072 dmu_write(zsb
->z_os
, zp
->z_id
, pgoff
, pglen
, va
, tx
);
4075 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
4076 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
4077 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_FLAGS(zsb
), NULL
, &zp
->z_pflags
, 8);
4079 /* Preserve the mtime and ctime provided by the inode */
4080 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4081 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4082 zp
->z_atime_dirty
= 0;
4085 err
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4087 zfs_log_write(zsb
->z_log
, tx
, TX_WRITE
, zp
, pgoff
, pglen
, 0,
4088 zfs_putpage_commit_cb
, pp
);
4091 zfs_range_unlock(rl
);
4093 if (wbc
->sync_mode
!= WB_SYNC_NONE
) {
4095 * Note that this is rarely called under writepages(), because
4096 * writepages() normally handles the entire commit for
4097 * performance reasons.
4099 if (zsb
->z_log
!= NULL
)
4100 zil_commit(zsb
->z_log
, zp
->z_id
);
4108 * Update the system attributes when the inode has been dirtied. For the
4109 * moment we only update the mode, atime, mtime, and ctime.
4112 zfs_dirty_inode(struct inode
*ip
, int flags
)
4114 znode_t
*zp
= ITOZ(ip
);
4115 zfs_sb_t
*zsb
= ITOZSB(ip
);
4117 uint64_t mode
, atime
[2], mtime
[2], ctime
[2];
4118 sa_bulk_attr_t bulk
[4];
4122 if (zfs_is_readonly(zsb
) || dmu_objset_is_snapshot(zsb
->z_os
))
4130 * This is the lazytime semantic indroduced in Linux 4.0
4131 * This flag will only be called from update_time when lazytime is set.
4132 * (Note, I_DIRTY_SYNC will also set if not lazytime)
4133 * Fortunately mtime and ctime are managed within ZFS itself, so we
4134 * only need to dirty atime.
4136 if (flags
== I_DIRTY_TIME
) {
4137 zp
->z_atime_dirty
= 1;
4142 tx
= dmu_tx_create(zsb
->z_os
);
4144 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4145 zfs_sa_upgrade_txholds(tx
, zp
);
4147 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4153 mutex_enter(&zp
->z_lock
);
4154 zp
->z_atime_dirty
= 0;
4156 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MODE(zsb
), NULL
, &mode
, 8);
4157 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_ATIME(zsb
), NULL
, &atime
, 16);
4158 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
4159 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
4161 /* Preserve the mode, mtime and ctime provided by the inode */
4162 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4163 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4164 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4169 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4170 mutex_exit(&zp
->z_lock
);
4177 EXPORT_SYMBOL(zfs_dirty_inode
);
4181 zfs_inactive(struct inode
*ip
)
4183 znode_t
*zp
= ITOZ(ip
);
4184 zfs_sb_t
*zsb
= ITOZSB(ip
);
4187 int need_unlock
= 0;
4189 /* Only read lock if we haven't already write locked, e.g. rollback */
4190 if (!RW_WRITE_HELD(&zsb
->z_teardown_inactive_lock
)) {
4192 rw_enter(&zsb
->z_teardown_inactive_lock
, RW_READER
);
4194 if (zp
->z_sa_hdl
== NULL
) {
4196 rw_exit(&zsb
->z_teardown_inactive_lock
);
4200 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
4201 dmu_tx_t
*tx
= dmu_tx_create(zsb
->z_os
);
4203 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4204 zfs_sa_upgrade_txholds(tx
, zp
);
4205 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4209 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4210 mutex_enter(&zp
->z_lock
);
4211 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zsb
),
4212 (void *)&atime
, sizeof (atime
), tx
);
4213 zp
->z_atime_dirty
= 0;
4214 mutex_exit(&zp
->z_lock
);
4221 rw_exit(&zsb
->z_teardown_inactive_lock
);
4223 EXPORT_SYMBOL(zfs_inactive
);
4226 * Bounds-check the seek operation.
4228 * IN: ip - inode seeking within
4229 * ooff - old file offset
4230 * noffp - pointer to new file offset
4231 * ct - caller context
4233 * RETURN: 0 if success
4234 * EINVAL if new offset invalid
4238 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
4240 if (S_ISDIR(ip
->i_mode
))
4242 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
4244 EXPORT_SYMBOL(zfs_seek
);
4247 * Fill pages with data from the disk.
4250 zfs_fillpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4252 znode_t
*zp
= ITOZ(ip
);
4253 zfs_sb_t
*zsb
= ITOZSB(ip
);
4255 struct page
*cur_pp
;
4256 u_offset_t io_off
, total
;
4263 io_len
= nr_pages
<< PAGE_SHIFT
;
4264 i_size
= i_size_read(ip
);
4265 io_off
= page_offset(pl
[0]);
4267 if (io_off
+ io_len
> i_size
)
4268 io_len
= i_size
- io_off
;
4271 * Iterate over list of pages and read each page individually.
4275 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
4279 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
4283 /* convert checksum errors into IO errors */
4285 err
= SET_ERROR(EIO
);
4288 cur_pp
= pl
[++page_idx
];
4295 * Uses zfs_fillpage to read data from the file and fill the pages.
4297 * IN: ip - inode of file to get data from.
4298 * pl - list of pages to read
4299 * nr_pages - number of pages to read
4301 * RETURN: 0 on success, error code on failure.
4304 * vp - atime updated
4308 zfs_getpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4310 znode_t
*zp
= ITOZ(ip
);
4311 zfs_sb_t
*zsb
= ITOZSB(ip
);
4320 err
= zfs_fillpage(ip
, pl
, nr_pages
);
4325 EXPORT_SYMBOL(zfs_getpage
);
4328 * Check ZFS specific permissions to memory map a section of a file.
4330 * IN: ip - inode of the file to mmap
4332 * addrp - start address in memory region
4333 * len - length of memory region
4334 * vm_flags- address flags
4336 * RETURN: 0 if success
4337 * error code if failure
4341 zfs_map(struct inode
*ip
, offset_t off
, caddr_t
*addrp
, size_t len
,
4342 unsigned long vm_flags
)
4344 znode_t
*zp
= ITOZ(ip
);
4345 zfs_sb_t
*zsb
= ITOZSB(ip
);
4350 if ((vm_flags
& VM_WRITE
) && (zp
->z_pflags
&
4351 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4353 return (SET_ERROR(EPERM
));
4356 if ((vm_flags
& (VM_READ
| VM_EXEC
)) &&
4357 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4359 return (SET_ERROR(EACCES
));
4362 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4364 return (SET_ERROR(ENXIO
));
4370 EXPORT_SYMBOL(zfs_map
);
4373 * convoff - converts the given data (start, whence) to the
4377 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4382 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4383 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4387 switch (lckdat
->l_whence
) {
4389 lckdat
->l_start
+= offset
;
4392 lckdat
->l_start
+= vap
.va_size
;
4397 return (SET_ERROR(EINVAL
));
4400 if (lckdat
->l_start
< 0)
4401 return (SET_ERROR(EINVAL
));
4405 lckdat
->l_start
-= offset
;
4408 lckdat
->l_start
-= vap
.va_size
;
4413 return (SET_ERROR(EINVAL
));
4416 lckdat
->l_whence
= (short)whence
;
4421 * Free or allocate space in a file. Currently, this function only
4422 * supports the `F_FREESP' command. However, this command is somewhat
4423 * misnamed, as its functionality includes the ability to allocate as
4424 * well as free space.
4426 * IN: ip - inode of file to free data in.
4427 * cmd - action to take (only F_FREESP supported).
4428 * bfp - section of file to free/alloc.
4429 * flag - current file open mode flags.
4430 * offset - current file offset.
4431 * cr - credentials of caller [UNUSED].
4433 * RETURN: 0 on success, error code on failure.
4436 * ip - ctime|mtime updated
4440 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4441 offset_t offset
, cred_t
*cr
)
4443 znode_t
*zp
= ITOZ(ip
);
4444 zfs_sb_t
*zsb
= ITOZSB(ip
);
4451 if (cmd
!= F_FREESP
) {
4453 return (SET_ERROR(EINVAL
));
4457 * Callers might not be able to detect properly that we are read-only,
4458 * so check it explicitly here.
4460 if (zfs_is_readonly(zsb
)) {
4462 return (SET_ERROR(EROFS
));
4465 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4470 if (bfp
->l_len
< 0) {
4472 return (SET_ERROR(EINVAL
));
4476 * Permissions aren't checked on Solaris because on this OS
4477 * zfs_space() can only be called with an opened file handle.
4478 * On Linux we can get here through truncate_range() which
4479 * operates directly on inodes, so we need to check access rights.
4481 if ((error
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
))) {
4487 len
= bfp
->l_len
; /* 0 means from off to end of file */
4489 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4494 EXPORT_SYMBOL(zfs_space
);
4498 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4500 znode_t
*zp
= ITOZ(ip
);
4501 zfs_sb_t
*zsb
= ITOZSB(ip
);
4504 uint64_t object
= zp
->z_id
;
4511 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zsb
),
4512 &gen64
, sizeof (uint64_t))) != 0) {
4517 gen
= (uint32_t)gen64
;
4519 size
= (zsb
->z_parent
!= zsb
) ? LONG_FID_LEN
: SHORT_FID_LEN
;
4520 if (fidp
->fid_len
< size
) {
4521 fidp
->fid_len
= size
;
4523 return (SET_ERROR(ENOSPC
));
4526 zfid
= (zfid_short_t
*)fidp
;
4528 zfid
->zf_len
= size
;
4530 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4531 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4533 /* Must have a non-zero generation number to distinguish from .zfs */
4536 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4537 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4539 if (size
== LONG_FID_LEN
) {
4540 uint64_t objsetid
= dmu_objset_id(zsb
->z_os
);
4543 zlfid
= (zfid_long_t
*)fidp
;
4545 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
4546 zlfid
->zf_setid
[i
] = (uint8_t)(objsetid
>> (8 * i
));
4548 /* XXX - this should be the generation number for the objset */
4549 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
4550 zlfid
->zf_setgen
[i
] = 0;
4556 EXPORT_SYMBOL(zfs_fid
);
4560 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4562 znode_t
*zp
= ITOZ(ip
);
4563 zfs_sb_t
*zsb
= ITOZSB(ip
);
4565 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4569 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4574 EXPORT_SYMBOL(zfs_getsecattr
);
4578 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4580 znode_t
*zp
= ITOZ(ip
);
4581 zfs_sb_t
*zsb
= ITOZSB(ip
);
4583 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4584 zilog_t
*zilog
= zsb
->z_log
;
4589 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4591 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4592 zil_commit(zilog
, 0);
4597 EXPORT_SYMBOL(zfs_setsecattr
);
4599 #ifdef HAVE_UIO_ZEROCOPY
4601 * Tunable, both must be a power of 2.
4603 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4604 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4605 * an arcbuf for a partial block read
4607 int zcr_blksz_min
= (1 << 10); /* 1K */
4608 int zcr_blksz_max
= (1 << 17); /* 128K */
4612 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4614 znode_t
*zp
= ITOZ(ip
);
4615 zfs_sb_t
*zsb
= ITOZSB(ip
);
4616 int max_blksz
= zsb
->z_max_blksz
;
4617 uio_t
*uio
= &xuio
->xu_uio
;
4618 ssize_t size
= uio
->uio_resid
;
4619 offset_t offset
= uio
->uio_loffset
;
4624 int preamble
, postamble
;
4626 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4627 return (SET_ERROR(EINVAL
));
4634 * Loan out an arc_buf for write if write size is bigger than
4635 * max_blksz, and the file's block size is also max_blksz.
4638 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4640 return (SET_ERROR(EINVAL
));
4643 * Caller requests buffers for write before knowing where the
4644 * write offset might be (e.g. NFS TCP write).
4649 preamble
= P2PHASE(offset
, blksz
);
4651 preamble
= blksz
- preamble
;
4656 postamble
= P2PHASE(size
, blksz
);
4659 fullblk
= size
/ blksz
;
4660 (void) dmu_xuio_init(xuio
,
4661 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4664 * Have to fix iov base/len for partial buffers. They
4665 * currently represent full arc_buf's.
4668 /* data begins in the middle of the arc_buf */
4669 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4672 (void) dmu_xuio_add(xuio
, abuf
,
4673 blksz
- preamble
, preamble
);
4676 for (i
= 0; i
< fullblk
; i
++) {
4677 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4680 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4684 /* data ends in the middle of the arc_buf */
4685 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4688 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4693 * Loan out an arc_buf for read if the read size is larger than
4694 * the current file block size. Block alignment is not
4695 * considered. Partial arc_buf will be loaned out for read.
4697 blksz
= zp
->z_blksz
;
4698 if (blksz
< zcr_blksz_min
)
4699 blksz
= zcr_blksz_min
;
4700 if (blksz
> zcr_blksz_max
)
4701 blksz
= zcr_blksz_max
;
4702 /* avoid potential complexity of dealing with it */
4703 if (blksz
> max_blksz
) {
4705 return (SET_ERROR(EINVAL
));
4708 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4714 return (SET_ERROR(EINVAL
));
4719 return (SET_ERROR(EINVAL
));
4722 uio
->uio_extflg
= UIO_XUIO
;
4723 XUIO_XUZC_RW(xuio
) = ioflag
;
4730 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4734 int ioflag
= XUIO_XUZC_RW(xuio
);
4736 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4738 i
= dmu_xuio_cnt(xuio
);
4740 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4742 * if abuf == NULL, it must be a write buffer
4743 * that has been returned in zfs_write().
4746 dmu_return_arcbuf(abuf
);
4747 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4750 dmu_xuio_fini(xuio
);
4753 #endif /* HAVE_UIO_ZEROCOPY */
4755 #if defined(_KERNEL) && defined(HAVE_SPL)
4756 module_param(zfs_delete_blocks
, ulong
, 0644);
4757 MODULE_PARM_DESC(zfs_delete_blocks
, "Delete files larger than N blocks async");
4758 module_param(zfs_read_chunk_size
, long, 0644);
4759 MODULE_PARM_DESC(zfs_read_chunk_size
, "Bytes to read per chunk");