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
;
601 sa_bulk_attr_t bulk
[4];
602 uint64_t mtime
[2], ctime
[2];
604 #ifdef HAVE_UIO_ZEROCOPY
606 const iovec_t
*iovp
= uio
->uio_iov
;
607 ASSERTV(int iovcnt
= uio
->uio_iovcnt
);
611 * Fasttrack empty write
617 if (limit
== RLIM64_INFINITY
|| limit
> MAXOFFSET_T
)
623 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
624 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
625 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
, &zp
->z_size
, 8);
626 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
630 * Callers might not be able to detect properly that we are read-only,
631 * so check it explicitly here.
633 if (zfs_is_readonly(zsb
)) {
635 return (SET_ERROR(EROFS
));
639 * If immutable or not appending then return EPERM
641 if ((zp
->z_pflags
& (ZFS_IMMUTABLE
| ZFS_READONLY
)) ||
642 ((zp
->z_pflags
& ZFS_APPENDONLY
) && !(ioflag
& FAPPEND
) &&
643 (uio
->uio_loffset
< zp
->z_size
))) {
645 return (SET_ERROR(EPERM
));
651 * Validate file offset
653 woff
= ioflag
& FAPPEND
? zp
->z_size
: uio
->uio_loffset
;
656 return (SET_ERROR(EINVAL
));
660 * Pre-fault the pages to ensure slow (eg NFS) pages
662 * Skip this if uio contains loaned arc_buf.
664 #ifdef HAVE_UIO_ZEROCOPY
665 if ((uio
->uio_extflg
== UIO_XUIO
) &&
666 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
))
667 xuio
= (xuio_t
*)uio
;
670 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
673 * If in append mode, set the io offset pointer to eof.
675 if (ioflag
& FAPPEND
) {
677 * Obtain an appending range lock to guarantee file append
678 * semantics. We reset the write offset once we have the lock.
680 rl
= zfs_range_lock(&zp
->z_range_lock
, 0, n
, RL_APPEND
);
682 if (rl
->r_len
== UINT64_MAX
) {
684 * We overlocked the file because this write will cause
685 * the file block size to increase.
686 * Note that zp_size cannot change with this lock held.
690 uio
->uio_loffset
= woff
;
693 * Note that if the file block size will change as a result of
694 * this write, then this range lock will lock the entire file
695 * so that we can re-write the block safely.
697 rl
= zfs_range_lock(&zp
->z_range_lock
, woff
, n
, RL_WRITER
);
701 zfs_range_unlock(rl
);
703 return (SET_ERROR(EFBIG
));
706 if ((woff
+ n
) > limit
|| woff
> (limit
- n
))
709 /* Will this write extend the file length? */
710 write_eof
= (woff
+ n
> zp
->z_size
);
712 end_size
= MAX(zp
->z_size
, woff
+ n
);
715 * Write the file in reasonable size chunks. Each chunk is written
716 * in a separate transaction; this keeps the intent log records small
717 * and allows us to do more fine-grained space accounting.
721 woff
= uio
->uio_loffset
;
722 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
723 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
725 dmu_return_arcbuf(abuf
);
726 error
= SET_ERROR(EDQUOT
);
730 if (xuio
&& abuf
== NULL
) {
731 #ifdef HAVE_UIO_ZEROCOPY
732 ASSERT(i_iov
< iovcnt
);
733 ASSERT3U(uio
->uio_segflg
, !=, UIO_BVEC
);
735 abuf
= dmu_xuio_arcbuf(xuio
, i_iov
);
736 dmu_xuio_clear(xuio
, i_iov
);
737 ASSERT((aiov
->iov_base
== abuf
->b_data
) ||
738 ((char *)aiov
->iov_base
- (char *)abuf
->b_data
+
739 aiov
->iov_len
== arc_buf_size(abuf
)));
742 } else if (abuf
== NULL
&& n
>= max_blksz
&&
743 woff
>= zp
->z_size
&&
744 P2PHASE(woff
, max_blksz
) == 0 &&
745 zp
->z_blksz
== max_blksz
) {
747 * This write covers a full block. "Borrow" a buffer
748 * from the dmu so that we can fill it before we enter
749 * a transaction. This avoids the possibility of
750 * holding up the transaction if the data copy hangs
751 * up on a pagefault (e.g., from an NFS server mapping).
755 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
757 ASSERT(abuf
!= NULL
);
758 ASSERT(arc_buf_size(abuf
) == max_blksz
);
759 if ((error
= uiocopy(abuf
->b_data
, max_blksz
,
760 UIO_WRITE
, uio
, &cbytes
))) {
761 dmu_return_arcbuf(abuf
);
764 ASSERT(cbytes
== max_blksz
);
768 * Start a transaction.
770 tx
= dmu_tx_create(zsb
->z_os
);
771 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
772 dmu_tx_hold_write(tx
, zp
->z_id
, woff
, MIN(n
, max_blksz
));
773 zfs_sa_upgrade_txholds(tx
, zp
);
774 error
= dmu_tx_assign(tx
, TXG_WAIT
);
778 dmu_return_arcbuf(abuf
);
783 * If zfs_range_lock() over-locked we grow the blocksize
784 * and then reduce the lock range. This will only happen
785 * on the first iteration since zfs_range_reduce() will
786 * shrink down r_len to the appropriate size.
788 if (rl
->r_len
== UINT64_MAX
) {
791 if (zp
->z_blksz
> max_blksz
) {
793 * File's blocksize is already larger than the
794 * "recordsize" property. Only let it grow to
795 * the next power of 2.
797 ASSERT(!ISP2(zp
->z_blksz
));
798 new_blksz
= MIN(end_size
,
799 1 << highbit64(zp
->z_blksz
));
801 new_blksz
= MIN(end_size
, max_blksz
);
803 zfs_grow_blocksize(zp
, new_blksz
, tx
);
804 zfs_range_reduce(rl
, woff
, n
);
808 * XXX - should we really limit each write to z_max_blksz?
809 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
811 nbytes
= MIN(n
, max_blksz
- P2PHASE(woff
, max_blksz
));
814 tx_bytes
= uio
->uio_resid
;
815 error
= dmu_write_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
817 tx_bytes
-= uio
->uio_resid
;
820 ASSERT(xuio
== NULL
|| tx_bytes
== aiov
->iov_len
);
822 * If this is not a full block write, but we are
823 * extending the file past EOF and this data starts
824 * block-aligned, use assign_arcbuf(). Otherwise,
825 * write via dmu_write().
827 if (tx_bytes
< max_blksz
&& (!write_eof
||
828 aiov
->iov_base
!= abuf
->b_data
)) {
830 dmu_write(zsb
->z_os
, zp
->z_id
, woff
,
831 aiov
->iov_len
, aiov
->iov_base
, tx
);
832 dmu_return_arcbuf(abuf
);
833 xuio_stat_wbuf_copied();
835 ASSERT(xuio
|| tx_bytes
== max_blksz
);
836 dmu_assign_arcbuf(sa_get_db(zp
->z_sa_hdl
),
839 ASSERT(tx_bytes
<= uio
->uio_resid
);
840 uioskip(uio
, tx_bytes
);
843 if (tx_bytes
&& zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
844 update_pages(ip
, woff
, tx_bytes
, zsb
->z_os
, zp
->z_id
);
847 * If we made no progress, we're done. If we made even
848 * partial progress, update the znode and ZIL accordingly.
851 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
852 (void *)&zp
->z_size
, sizeof (uint64_t), tx
);
859 * Clear Set-UID/Set-GID bits on successful write if not
860 * privileged and at least one of the excute bits is set.
862 * It would be nice to to this after all writes have
863 * been done, but that would still expose the ISUID/ISGID
864 * to another app after the partial write is committed.
866 * Note: we don't call zfs_fuid_map_id() here because
867 * user 0 is not an ephemeral uid.
869 mutex_enter(&zp
->z_acl_lock
);
870 uid
= KUID_TO_SUID(ip
->i_uid
);
871 if ((zp
->z_mode
& (S_IXUSR
| (S_IXUSR
>> 3) |
872 (S_IXUSR
>> 6))) != 0 &&
873 (zp
->z_mode
& (S_ISUID
| S_ISGID
)) != 0 &&
874 secpolicy_vnode_setid_retain(cr
,
875 ((zp
->z_mode
& S_ISUID
) != 0 && uid
== 0)) != 0) {
877 zp
->z_mode
&= ~(S_ISUID
| S_ISGID
);
878 ip
->i_mode
= newmode
= zp
->z_mode
;
879 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_MODE(zsb
),
880 (void *)&newmode
, sizeof (uint64_t), tx
);
882 mutex_exit(&zp
->z_acl_lock
);
884 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
);
887 * Update the file size (zp_size) if it has changed;
888 * account for possible concurrent updates.
890 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
891 (void) atomic_cas_64(&zp
->z_size
, end_size
,
896 * If we are replaying and eof is non zero then force
897 * the file size to the specified eof. Note, there's no
898 * concurrency during replay.
900 if (zsb
->z_replay
&& zsb
->z_replay_eof
!= 0)
901 zp
->z_size
= zsb
->z_replay_eof
;
903 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
905 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
,
911 ASSERT(tx_bytes
== nbytes
);
915 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
918 zfs_inode_update(zp
);
919 zfs_range_unlock(rl
);
922 * If we're in replay mode, or we made no progress, return error.
923 * Otherwise, it's at least a partial write, so it's successful.
925 if (zsb
->z_replay
|| uio
->uio_resid
== start_resid
) {
930 if (ioflag
& (FSYNC
| FDSYNC
) ||
931 zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
932 zil_commit(zilog
, zp
->z_id
);
937 EXPORT_SYMBOL(zfs_write
);
940 * Drop a reference on the passed inode asynchronously. This ensures
941 * that the caller will never drop the last reference on an inode in
942 * the current context. Doing so while holding open a tx could result
943 * in a deadlock if iput_final() re-enters the filesystem code.
946 zfs_iput_async(struct inode
*ip
)
948 objset_t
*os
= ITOZSB(ip
)->z_os
;
950 ASSERT(atomic_read(&ip
->i_count
) > 0);
953 if (atomic_read(&ip
->i_count
) == 1)
954 VERIFY(taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os
)),
955 (task_func_t
*)iput
, ip
, TQ_SLEEP
) != TASKQID_INVALID
);
961 zfs_get_done(zgd_t
*zgd
, int error
)
963 znode_t
*zp
= zgd
->zgd_private
;
966 dmu_buf_rele(zgd
->zgd_db
, zgd
);
968 zfs_range_unlock(zgd
->zgd_rl
);
971 * Release the vnode asynchronously as we currently have the
972 * txg stopped from syncing.
974 zfs_iput_async(ZTOI(zp
));
976 if (error
== 0 && zgd
->zgd_bp
)
977 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
979 kmem_free(zgd
, sizeof (zgd_t
));
983 static int zil_fault_io
= 0;
987 * Get data to generate a TX_WRITE intent log record.
990 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
993 objset_t
*os
= zsb
->z_os
;
995 uint64_t object
= lr
->lr_foid
;
996 uint64_t offset
= lr
->lr_offset
;
997 uint64_t size
= lr
->lr_length
;
998 blkptr_t
*bp
= &lr
->lr_blkptr
;
1003 ASSERT(zio
!= NULL
);
1007 * Nothing to do if the file has been removed
1009 if (zfs_zget(zsb
, object
, &zp
) != 0)
1010 return (SET_ERROR(ENOENT
));
1011 if (zp
->z_unlinked
) {
1013 * Release the vnode asynchronously as we currently have the
1014 * txg stopped from syncing.
1016 zfs_iput_async(ZTOI(zp
));
1017 return (SET_ERROR(ENOENT
));
1020 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_SLEEP
);
1021 zgd
->zgd_zilog
= zsb
->z_log
;
1022 zgd
->zgd_private
= zp
;
1025 * Write records come in two flavors: immediate and indirect.
1026 * For small writes it's cheaper to store the data with the
1027 * log record (immediate); for large writes it's cheaper to
1028 * sync the data and get a pointer to it (indirect) so that
1029 * we don't have to write the data twice.
1031 if (buf
!= NULL
) { /* immediate write */
1032 zgd
->zgd_rl
= zfs_range_lock(&zp
->z_range_lock
, offset
, size
,
1034 /* test for truncation needs to be done while range locked */
1035 if (offset
>= zp
->z_size
) {
1036 error
= SET_ERROR(ENOENT
);
1038 error
= dmu_read(os
, object
, offset
, size
, buf
,
1039 DMU_READ_NO_PREFETCH
);
1041 ASSERT(error
== 0 || error
== ENOENT
);
1042 } else { /* indirect write */
1044 * Have to lock the whole block to ensure when it's
1045 * written out and it's checksum is being calculated
1046 * that no one can change the data. We need to re-check
1047 * blocksize after we get the lock in case it's changed!
1052 blkoff
= ISP2(size
) ? P2PHASE(offset
, size
) : offset
;
1054 zgd
->zgd_rl
= zfs_range_lock(&zp
->z_range_lock
, offset
,
1056 if (zp
->z_blksz
== size
)
1059 zfs_range_unlock(zgd
->zgd_rl
);
1061 /* test for truncation needs to be done while range locked */
1062 if (lr
->lr_offset
>= zp
->z_size
)
1063 error
= SET_ERROR(ENOENT
);
1066 error
= SET_ERROR(EIO
);
1071 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
1072 DMU_READ_NO_PREFETCH
);
1075 blkptr_t
*obp
= dmu_buf_get_blkptr(db
);
1077 ASSERT(BP_IS_HOLE(bp
));
1084 ASSERT(db
->db_offset
== offset
);
1085 ASSERT(db
->db_size
== size
);
1087 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
1089 ASSERT(error
|| lr
->lr_length
<= zp
->z_blksz
);
1092 * On success, we need to wait for the write I/O
1093 * initiated by dmu_sync() to complete before we can
1094 * release this dbuf. We will finish everything up
1095 * in the zfs_get_done() callback.
1100 if (error
== EALREADY
) {
1101 lr
->lr_common
.lrc_txtype
= TX_WRITE2
;
1107 zfs_get_done(zgd
, error
);
1114 zfs_access(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
1116 znode_t
*zp
= ITOZ(ip
);
1117 zfs_sb_t
*zsb
= ITOZSB(ip
);
1123 if (flag
& V_ACE_MASK
)
1124 error
= zfs_zaccess(zp
, mode
, flag
, B_FALSE
, cr
);
1126 error
= zfs_zaccess_rwx(zp
, mode
, flag
, cr
);
1131 EXPORT_SYMBOL(zfs_access
);
1134 * Lookup an entry in a directory, or an extended attribute directory.
1135 * If it exists, return a held inode reference for it.
1137 * IN: dip - inode of directory to search.
1138 * nm - name of entry to lookup.
1139 * flags - LOOKUP_XATTR set if looking for an attribute.
1140 * cr - credentials of caller.
1141 * direntflags - directory lookup flags
1142 * realpnp - returned pathname.
1144 * OUT: ipp - inode of located entry, NULL if not found.
1146 * RETURN: 0 on success, error code on failure.
1153 zfs_lookup(struct inode
*dip
, char *nm
, struct inode
**ipp
, int flags
,
1154 cred_t
*cr
, int *direntflags
, pathname_t
*realpnp
)
1156 znode_t
*zdp
= ITOZ(dip
);
1157 zfs_sb_t
*zsb
= ITOZSB(dip
);
1161 if (!(flags
& (LOOKUP_XATTR
| FIGNORECASE
))) {
1163 if (!S_ISDIR(dip
->i_mode
)) {
1164 return (SET_ERROR(ENOTDIR
));
1165 } else if (zdp
->z_sa_hdl
== NULL
) {
1166 return (SET_ERROR(EIO
));
1169 if (nm
[0] == 0 || (nm
[0] == '.' && nm
[1] == '\0')) {
1170 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1179 vnode_t
*tvp
= dnlc_lookup(dvp
, nm
);
1182 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1187 if (tvp
== DNLC_NO_VNODE
) {
1189 return (SET_ERROR(ENOENT
));
1192 return (specvp_check(vpp
, cr
));
1195 #endif /* HAVE_DNLC */
1204 if (flags
& LOOKUP_XATTR
) {
1206 * We don't allow recursive attributes..
1207 * Maybe someday we will.
1209 if (zdp
->z_pflags
& ZFS_XATTR
) {
1211 return (SET_ERROR(EINVAL
));
1214 if ((error
= zfs_get_xattrdir(zdp
, ipp
, cr
, flags
))) {
1220 * Do we have permission to get into attribute directory?
1223 if ((error
= zfs_zaccess(ITOZ(*ipp
), ACE_EXECUTE
, 0,
1233 if (!S_ISDIR(dip
->i_mode
)) {
1235 return (SET_ERROR(ENOTDIR
));
1239 * Check accessibility of directory.
1242 if ((error
= zfs_zaccess(zdp
, ACE_EXECUTE
, 0, B_FALSE
, cr
))) {
1247 if (zsb
->z_utf8
&& u8_validate(nm
, strlen(nm
),
1248 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1250 return (SET_ERROR(EILSEQ
));
1253 error
= zfs_dirlook(zdp
, nm
, ipp
, flags
, direntflags
, realpnp
);
1254 if ((error
== 0) && (*ipp
))
1255 zfs_inode_update(ITOZ(*ipp
));
1260 EXPORT_SYMBOL(zfs_lookup
);
1263 * Attempt to create a new entry in a directory. If the entry
1264 * already exists, truncate the file if permissible, else return
1265 * an error. Return the ip of the created or trunc'd file.
1267 * IN: dip - inode of directory to put new file entry in.
1268 * name - name of new file entry.
1269 * vap - attributes of new file.
1270 * excl - flag indicating exclusive or non-exclusive mode.
1271 * mode - mode to open file with.
1272 * cr - credentials of caller.
1273 * flag - large file flag [UNUSED].
1274 * vsecp - ACL to be set
1276 * OUT: ipp - inode of created or trunc'd entry.
1278 * RETURN: 0 on success, error code on failure.
1281 * dip - ctime|mtime updated if new entry created
1282 * ip - ctime|mtime always, atime if new
1287 zfs_create(struct inode
*dip
, char *name
, vattr_t
*vap
, int excl
,
1288 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1290 znode_t
*zp
, *dzp
= ITOZ(dip
);
1291 zfs_sb_t
*zsb
= ITOZSB(dip
);
1299 zfs_acl_ids_t acl_ids
;
1300 boolean_t fuid_dirtied
;
1301 boolean_t have_acl
= B_FALSE
;
1302 boolean_t waited
= B_FALSE
;
1305 * If we have an ephemeral id, ACL, or XVATTR then
1306 * make sure file system is at proper version
1312 if (zsb
->z_use_fuids
== B_FALSE
&&
1313 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1314 return (SET_ERROR(EINVAL
));
1321 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
1322 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1324 return (SET_ERROR(EILSEQ
));
1327 if (vap
->va_mask
& ATTR_XVATTR
) {
1328 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1329 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1337 if (*name
== '\0') {
1339 * Null component name refers to the directory itself.
1346 /* possible igrab(zp) */
1349 if (flag
& FIGNORECASE
)
1352 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1356 zfs_acl_ids_free(&acl_ids
);
1357 if (strcmp(name
, "..") == 0)
1358 error
= SET_ERROR(EISDIR
);
1368 * Create a new file object and update the directory
1371 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1373 zfs_acl_ids_free(&acl_ids
);
1378 * We only support the creation of regular files in
1379 * extended attribute directories.
1382 if ((dzp
->z_pflags
& ZFS_XATTR
) && !S_ISREG(vap
->va_mode
)) {
1384 zfs_acl_ids_free(&acl_ids
);
1385 error
= SET_ERROR(EINVAL
);
1389 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1390 cr
, vsecp
, &acl_ids
)) != 0)
1394 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1395 zfs_acl_ids_free(&acl_ids
);
1396 error
= SET_ERROR(EDQUOT
);
1400 tx
= dmu_tx_create(os
);
1402 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1403 ZFS_SA_BASE_ATTR_SIZE
);
1405 fuid_dirtied
= zsb
->z_fuid_dirty
;
1407 zfs_fuid_txhold(zsb
, tx
);
1408 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
1409 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
1410 if (!zsb
->z_use_sa
&&
1411 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1412 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1413 0, acl_ids
.z_aclp
->z_acl_bytes
);
1415 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1417 zfs_dirent_unlock(dl
);
1418 if (error
== ERESTART
) {
1424 zfs_acl_ids_free(&acl_ids
);
1429 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1432 zfs_fuid_sync(zsb
, tx
);
1434 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1435 txtype
= zfs_log_create_txtype(Z_FILE
, vsecp
, vap
);
1436 if (flag
& FIGNORECASE
)
1438 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, name
,
1439 vsecp
, acl_ids
.z_fuidp
, vap
);
1440 zfs_acl_ids_free(&acl_ids
);
1443 int aflags
= (flag
& FAPPEND
) ? V_APPEND
: 0;
1446 zfs_acl_ids_free(&acl_ids
);
1450 * A directory entry already exists for this name.
1453 * Can't truncate an existing file if in exclusive mode.
1456 error
= SET_ERROR(EEXIST
);
1460 * Can't open a directory for writing.
1462 if (S_ISDIR(ZTOI(zp
)->i_mode
)) {
1463 error
= SET_ERROR(EISDIR
);
1467 * Verify requested access to file.
1469 if (mode
&& (error
= zfs_zaccess_rwx(zp
, mode
, aflags
, cr
))) {
1473 mutex_enter(&dzp
->z_lock
);
1475 mutex_exit(&dzp
->z_lock
);
1478 * Truncate regular files if requested.
1480 if (S_ISREG(ZTOI(zp
)->i_mode
) &&
1481 (vap
->va_mask
& ATTR_SIZE
) && (vap
->va_size
== 0)) {
1482 /* we can't hold any locks when calling zfs_freesp() */
1484 zfs_dirent_unlock(dl
);
1487 error
= zfs_freesp(zp
, 0, 0, mode
, TRUE
);
1493 zfs_dirent_unlock(dl
);
1499 zfs_inode_update(dzp
);
1500 zfs_inode_update(zp
);
1504 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1505 zil_commit(zilog
, 0);
1510 EXPORT_SYMBOL(zfs_create
);
1514 zfs_tmpfile(struct inode
*dip
, vattr_t
*vap
, int excl
,
1515 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1517 znode_t
*zp
= NULL
, *dzp
= ITOZ(dip
);
1518 zfs_sb_t
*zsb
= ITOZSB(dip
);
1524 zfs_acl_ids_t acl_ids
;
1525 boolean_t fuid_dirtied
;
1526 boolean_t have_acl
= B_FALSE
;
1527 boolean_t waited
= B_FALSE
;
1530 * If we have an ephemeral id, ACL, or XVATTR then
1531 * make sure file system is at proper version
1537 if (zsb
->z_use_fuids
== B_FALSE
&&
1538 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1539 return (SET_ERROR(EINVAL
));
1545 if (vap
->va_mask
& ATTR_XVATTR
) {
1546 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1547 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1557 * Create a new file object and update the directory
1560 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1562 zfs_acl_ids_free(&acl_ids
);
1566 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1567 cr
, vsecp
, &acl_ids
)) != 0)
1571 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1572 zfs_acl_ids_free(&acl_ids
);
1573 error
= SET_ERROR(EDQUOT
);
1577 tx
= dmu_tx_create(os
);
1579 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1580 ZFS_SA_BASE_ATTR_SIZE
);
1581 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1583 fuid_dirtied
= zsb
->z_fuid_dirty
;
1585 zfs_fuid_txhold(zsb
, tx
);
1586 if (!zsb
->z_use_sa
&&
1587 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1588 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1589 0, acl_ids
.z_aclp
->z_acl_bytes
);
1591 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1593 if (error
== ERESTART
) {
1599 zfs_acl_ids_free(&acl_ids
);
1604 zfs_mknode(dzp
, vap
, tx
, cr
, IS_TMPFILE
, &zp
, &acl_ids
);
1607 zfs_fuid_sync(zsb
, tx
);
1609 /* Add to unlinked set */
1611 zfs_unlinked_add(zp
, tx
);
1612 zfs_acl_ids_free(&acl_ids
);
1620 zfs_inode_update(dzp
);
1621 zfs_inode_update(zp
);
1630 * Remove an entry from a directory.
1632 * IN: dip - inode of directory to remove entry from.
1633 * name - name of entry to remove.
1634 * cr - credentials of caller.
1636 * RETURN: 0 if success
1637 * error code if failure
1641 * ip - ctime (if nlink > 0)
1644 uint64_t null_xattr
= 0;
1648 zfs_remove(struct inode
*dip
, char *name
, cred_t
*cr
, int flags
)
1650 znode_t
*zp
, *dzp
= ITOZ(dip
);
1653 zfs_sb_t
*zsb
= ITOZSB(dip
);
1655 uint64_t acl_obj
, xattr_obj
;
1656 uint64_t xattr_obj_unlinked
= 0;
1661 boolean_t may_delete_now
, delete_now
= FALSE
;
1662 boolean_t unlinked
, toobig
= FALSE
;
1664 pathname_t
*realnmp
= NULL
;
1668 boolean_t waited
= B_FALSE
;
1674 if (flags
& FIGNORECASE
) {
1684 * Attempt to lock directory; fail if entry doesn't exist.
1686 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1696 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1701 * Need to use rmdir for removing directories.
1703 if (S_ISDIR(ip
->i_mode
)) {
1704 error
= SET_ERROR(EPERM
);
1710 dnlc_remove(dvp
, realnmp
->pn_buf
);
1712 dnlc_remove(dvp
, name
);
1713 #endif /* HAVE_DNLC */
1715 mutex_enter(&zp
->z_lock
);
1716 may_delete_now
= atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
);
1717 mutex_exit(&zp
->z_lock
);
1720 * We may delete the znode now, or we may put it in the unlinked set;
1721 * it depends on whether we're the last link, and on whether there are
1722 * other holds on the inode. So we dmu_tx_hold() the right things to
1723 * allow for either case.
1726 tx
= dmu_tx_create(zsb
->z_os
);
1727 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1728 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1729 zfs_sa_upgrade_txholds(tx
, zp
);
1730 zfs_sa_upgrade_txholds(tx
, dzp
);
1731 if (may_delete_now
) {
1732 toobig
= zp
->z_size
> zp
->z_blksz
* zfs_delete_blocks
;
1733 /* if the file is too big, only hold_free a token amount */
1734 dmu_tx_hold_free(tx
, zp
->z_id
, 0,
1735 (toobig
? DMU_MAX_ACCESS
: DMU_OBJECT_END
));
1738 /* are there any extended attributes? */
1739 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1740 &xattr_obj
, sizeof (xattr_obj
));
1741 if (error
== 0 && xattr_obj
) {
1742 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
1744 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1745 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1748 mutex_enter(&zp
->z_lock
);
1749 if ((acl_obj
= zfs_external_acl(zp
)) != 0 && may_delete_now
)
1750 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
1751 mutex_exit(&zp
->z_lock
);
1753 /* charge as an update -- would be nice not to charge at all */
1754 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1757 * Mark this transaction as typically resulting in a net free of space
1759 dmu_tx_mark_netfree(tx
);
1761 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1763 zfs_dirent_unlock(dl
);
1767 if (error
== ERESTART
) {
1781 * Remove the directory entry.
1783 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1792 * Hold z_lock so that we can make sure that the ACL obj
1793 * hasn't changed. Could have been deleted due to
1796 mutex_enter(&zp
->z_lock
);
1797 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1798 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1799 delete_now
= may_delete_now
&& !toobig
&&
1800 atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
) &&
1801 xattr_obj
== xattr_obj_unlinked
&& zfs_external_acl(zp
) ==
1806 if (xattr_obj_unlinked
) {
1807 ASSERT3U(ZTOI(xzp
)->i_nlink
, ==, 2);
1808 mutex_enter(&xzp
->z_lock
);
1809 xzp
->z_unlinked
= 1;
1810 clear_nlink(ZTOI(xzp
));
1812 error
= sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zsb
),
1813 &links
, sizeof (links
), tx
);
1814 ASSERT3U(error
, ==, 0);
1815 mutex_exit(&xzp
->z_lock
);
1816 zfs_unlinked_add(xzp
, tx
);
1819 error
= sa_remove(zp
->z_sa_hdl
,
1820 SA_ZPL_XATTR(zsb
), tx
);
1822 error
= sa_update(zp
->z_sa_hdl
,
1823 SA_ZPL_XATTR(zsb
), &null_xattr
,
1824 sizeof (uint64_t), tx
);
1828 * Add to the unlinked set because a new reference could be
1829 * taken concurrently resulting in a deferred destruction.
1831 zfs_unlinked_add(zp
, tx
);
1832 mutex_exit(&zp
->z_lock
);
1833 zfs_inode_update(zp
);
1835 } else if (unlinked
) {
1836 mutex_exit(&zp
->z_lock
);
1837 zfs_unlinked_add(zp
, tx
);
1841 if (flags
& FIGNORECASE
)
1843 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1850 zfs_dirent_unlock(dl
);
1851 zfs_inode_update(dzp
);
1854 zfs_inode_update(zp
);
1859 zfs_inode_update(xzp
);
1860 zfs_iput_async(ZTOI(xzp
));
1863 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1864 zil_commit(zilog
, 0);
1869 EXPORT_SYMBOL(zfs_remove
);
1872 * Create a new directory and insert it into dip using the name
1873 * provided. Return a pointer to the inserted directory.
1875 * IN: dip - inode of directory to add subdir to.
1876 * dirname - name of new directory.
1877 * vap - attributes of new directory.
1878 * cr - credentials of caller.
1879 * vsecp - ACL to be set
1881 * OUT: ipp - inode of created directory.
1883 * RETURN: 0 if success
1884 * error code if failure
1887 * dip - ctime|mtime updated
1888 * ipp - ctime|mtime|atime updated
1892 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1893 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1895 znode_t
*zp
, *dzp
= ITOZ(dip
);
1896 zfs_sb_t
*zsb
= ITOZSB(dip
);
1904 gid_t gid
= crgetgid(cr
);
1905 zfs_acl_ids_t acl_ids
;
1906 boolean_t fuid_dirtied
;
1907 boolean_t waited
= B_FALSE
;
1909 ASSERT(S_ISDIR(vap
->va_mode
));
1912 * If we have an ephemeral id, ACL, or XVATTR then
1913 * make sure file system is at proper version
1917 if (zsb
->z_use_fuids
== B_FALSE
&&
1918 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1919 return (SET_ERROR(EINVAL
));
1925 if (dzp
->z_pflags
& ZFS_XATTR
) {
1927 return (SET_ERROR(EINVAL
));
1930 if (zsb
->z_utf8
&& u8_validate(dirname
,
1931 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1933 return (SET_ERROR(EILSEQ
));
1935 if (flags
& FIGNORECASE
)
1938 if (vap
->va_mask
& ATTR_XVATTR
) {
1939 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1940 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1946 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1947 vsecp
, &acl_ids
)) != 0) {
1952 * First make sure the new directory doesn't exist.
1954 * Existence is checked first to make sure we don't return
1955 * EACCES instead of EEXIST which can cause some applications
1961 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1963 zfs_acl_ids_free(&acl_ids
);
1968 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1969 zfs_acl_ids_free(&acl_ids
);
1970 zfs_dirent_unlock(dl
);
1975 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1976 zfs_acl_ids_free(&acl_ids
);
1977 zfs_dirent_unlock(dl
);
1979 return (SET_ERROR(EDQUOT
));
1983 * Add a new entry to the directory.
1985 tx
= dmu_tx_create(zsb
->z_os
);
1986 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
1987 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
1988 fuid_dirtied
= zsb
->z_fuid_dirty
;
1990 zfs_fuid_txhold(zsb
, tx
);
1991 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1992 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
1993 acl_ids
.z_aclp
->z_acl_bytes
);
1996 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1997 ZFS_SA_BASE_ATTR_SIZE
);
1999 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
2001 zfs_dirent_unlock(dl
);
2002 if (error
== ERESTART
) {
2008 zfs_acl_ids_free(&acl_ids
);
2017 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
2020 zfs_fuid_sync(zsb
, tx
);
2023 * Now put new name in parent dir.
2025 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
2029 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
2030 if (flags
& FIGNORECASE
)
2032 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
2033 acl_ids
.z_fuidp
, vap
);
2035 zfs_acl_ids_free(&acl_ids
);
2039 zfs_dirent_unlock(dl
);
2041 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2042 zil_commit(zilog
, 0);
2044 zfs_inode_update(dzp
);
2045 zfs_inode_update(zp
);
2049 EXPORT_SYMBOL(zfs_mkdir
);
2052 * Remove a directory subdir entry. If the current working
2053 * directory is the same as the subdir to be removed, the
2056 * IN: dip - inode of directory to remove from.
2057 * name - name of directory to be removed.
2058 * cwd - inode of current working directory.
2059 * cr - credentials of caller.
2060 * flags - case flags
2062 * RETURN: 0 on success, error code on failure.
2065 * dip - ctime|mtime updated
2069 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
2072 znode_t
*dzp
= ITOZ(dip
);
2075 zfs_sb_t
*zsb
= ITOZSB(dip
);
2081 boolean_t waited
= B_FALSE
;
2087 if (flags
& FIGNORECASE
)
2093 * Attempt to lock directory; fail if entry doesn't exist.
2095 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
2103 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
2107 if (!S_ISDIR(ip
->i_mode
)) {
2108 error
= SET_ERROR(ENOTDIR
);
2113 error
= SET_ERROR(EINVAL
);
2118 * Grab a lock on the directory to make sure that noone is
2119 * trying to add (or lookup) entries while we are removing it.
2121 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
2124 * Grab a lock on the parent pointer to make sure we play well
2125 * with the treewalk and directory rename code.
2127 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
2129 tx
= dmu_tx_create(zsb
->z_os
);
2130 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
2131 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2132 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
2133 zfs_sa_upgrade_txholds(tx
, zp
);
2134 zfs_sa_upgrade_txholds(tx
, dzp
);
2135 dmu_tx_mark_netfree(tx
);
2136 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
2138 rw_exit(&zp
->z_parent_lock
);
2139 rw_exit(&zp
->z_name_lock
);
2140 zfs_dirent_unlock(dl
);
2142 if (error
== ERESTART
) {
2153 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
2156 uint64_t txtype
= TX_RMDIR
;
2157 if (flags
& FIGNORECASE
)
2159 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
2164 rw_exit(&zp
->z_parent_lock
);
2165 rw_exit(&zp
->z_name_lock
);
2167 zfs_dirent_unlock(dl
);
2169 zfs_inode_update(dzp
);
2170 zfs_inode_update(zp
);
2173 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2174 zil_commit(zilog
, 0);
2179 EXPORT_SYMBOL(zfs_rmdir
);
2182 * Read as many directory entries as will fit into the provided
2183 * dirent buffer from the given directory cursor position.
2185 * IN: ip - inode of directory to read.
2186 * dirent - buffer for directory entries.
2188 * OUT: dirent - filler buffer of directory entries.
2190 * RETURN: 0 if success
2191 * error code if failure
2194 * ip - atime updated
2196 * Note that the low 4 bits of the cookie returned by zap is always zero.
2197 * This allows us to use the low range for "special" directory entries:
2198 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2199 * we use the offset 2 for the '.zfs' directory.
2203 zfs_readdir(struct inode
*ip
, struct dir_context
*ctx
, cred_t
*cr
)
2205 znode_t
*zp
= ITOZ(ip
);
2206 zfs_sb_t
*zsb
= ITOZSB(ip
);
2209 zap_attribute_t zap
;
2215 uint64_t offset
; /* must be unsigned; checks for < 1 */
2220 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
2221 &parent
, sizeof (parent
))) != 0)
2225 * Quit if directory has been removed (posix)
2233 prefetch
= zp
->z_zn_prefetch
;
2236 * Initialize the iterator cursor.
2240 * Start iteration from the beginning of the directory.
2242 zap_cursor_init(&zc
, os
, zp
->z_id
);
2245 * The offset is a serialized cursor.
2247 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, offset
);
2251 * Transform to file-system independent format
2256 * Special case `.', `..', and `.zfs'.
2259 (void) strcpy(zap
.za_name
, ".");
2260 zap
.za_normalization_conflict
= 0;
2263 } else if (offset
== 1) {
2264 (void) strcpy(zap
.za_name
, "..");
2265 zap
.za_normalization_conflict
= 0;
2268 } else if (offset
== 2 && zfs_show_ctldir(zp
)) {
2269 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
2270 zap
.za_normalization_conflict
= 0;
2271 objnum
= ZFSCTL_INO_ROOT
;
2277 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
2278 if (error
== ENOENT
)
2285 * Allow multiple entries provided the first entry is
2286 * the object id. Non-zpl consumers may safely make
2287 * use of the additional space.
2289 * XXX: This should be a feature flag for compatibility
2291 if (zap
.za_integer_length
!= 8 ||
2292 zap
.za_num_integers
== 0) {
2293 cmn_err(CE_WARN
, "zap_readdir: bad directory "
2294 "entry, obj = %lld, offset = %lld, "
2295 "length = %d, num = %lld\n",
2296 (u_longlong_t
)zp
->z_id
,
2297 (u_longlong_t
)offset
,
2298 zap
.za_integer_length
,
2299 (u_longlong_t
)zap
.za_num_integers
);
2300 error
= SET_ERROR(ENXIO
);
2304 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
2305 type
= ZFS_DIRENT_TYPE(zap
.za_first_integer
);
2308 done
= !dir_emit(ctx
, zap
.za_name
, strlen(zap
.za_name
),
2313 /* Prefetch znode */
2315 dmu_prefetch(os
, objnum
, 0, 0, 0,
2316 ZIO_PRIORITY_SYNC_READ
);
2320 * Move to the next entry, fill in the previous offset.
2322 if (offset
> 2 || (offset
== 2 && !zfs_show_ctldir(zp
))) {
2323 zap_cursor_advance(&zc
);
2324 offset
= zap_cursor_serialize(&zc
);
2330 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
2333 zap_cursor_fini(&zc
);
2334 if (error
== ENOENT
)
2341 EXPORT_SYMBOL(zfs_readdir
);
2343 ulong_t zfs_fsync_sync_cnt
= 4;
2346 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2348 znode_t
*zp
= ITOZ(ip
);
2349 zfs_sb_t
*zsb
= ITOZSB(ip
);
2351 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2353 if (zsb
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2356 zil_commit(zsb
->z_log
, zp
->z_id
);
2359 tsd_set(zfs_fsyncer_key
, NULL
);
2363 EXPORT_SYMBOL(zfs_fsync
);
2367 * Get the requested file attributes and place them in the provided
2370 * IN: ip - inode of file.
2371 * vap - va_mask identifies requested attributes.
2372 * If ATTR_XVATTR set, then optional attrs are requested
2373 * flags - ATTR_NOACLCHECK (CIFS server context)
2374 * cr - credentials of caller.
2376 * OUT: vap - attribute values.
2378 * RETURN: 0 (always succeeds)
2382 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2384 znode_t
*zp
= ITOZ(ip
);
2385 zfs_sb_t
*zsb
= ITOZSB(ip
);
2388 uint64_t atime
[2], mtime
[2], ctime
[2];
2389 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2390 xoptattr_t
*xoap
= NULL
;
2391 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2392 sa_bulk_attr_t bulk
[3];
2398 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2400 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
, &atime
, 16);
2401 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
2402 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
2404 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2410 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2411 * Also, if we are the owner don't bother, since owner should
2412 * always be allowed to read basic attributes of file.
2414 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2415 (vap
->va_uid
!= crgetuid(cr
))) {
2416 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2424 * Return all attributes. It's cheaper to provide the answer
2425 * than to determine whether we were asked the question.
2428 mutex_enter(&zp
->z_lock
);
2429 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2430 vap
->va_mode
= zp
->z_mode
;
2431 vap
->va_fsid
= ZTOI(zp
)->i_sb
->s_dev
;
2432 vap
->va_nodeid
= zp
->z_id
;
2433 if ((zp
->z_id
== zsb
->z_root
) && zfs_show_ctldir(zp
))
2434 links
= ZTOI(zp
)->i_nlink
+ 1;
2436 links
= ZTOI(zp
)->i_nlink
;
2437 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2438 vap
->va_size
= i_size_read(ip
);
2439 vap
->va_rdev
= ip
->i_rdev
;
2440 vap
->va_seq
= ip
->i_generation
;
2443 * Add in any requested optional attributes and the create time.
2444 * Also set the corresponding bits in the returned attribute bitmap.
2446 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zsb
->z_use_fuids
) {
2447 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2449 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2450 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2453 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2454 xoap
->xoa_readonly
=
2455 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2456 XVA_SET_RTN(xvap
, XAT_READONLY
);
2459 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2461 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2462 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2465 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2467 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2468 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2471 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2472 xoap
->xoa_nounlink
=
2473 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2474 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2477 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2478 xoap
->xoa_immutable
=
2479 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2480 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2483 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2484 xoap
->xoa_appendonly
=
2485 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2486 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2489 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2491 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2492 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2495 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2497 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2498 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2501 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2502 xoap
->xoa_av_quarantined
=
2503 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2504 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2507 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2508 xoap
->xoa_av_modified
=
2509 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2510 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2513 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2514 S_ISREG(ip
->i_mode
)) {
2515 zfs_sa_get_scanstamp(zp
, xvap
);
2518 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2521 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zsb
),
2522 times
, sizeof (times
));
2523 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2524 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2527 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2528 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2529 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2531 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2532 xoap
->xoa_generation
= ip
->i_generation
;
2533 XVA_SET_RTN(xvap
, XAT_GEN
);
2536 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2538 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2539 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2542 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2544 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2545 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2549 ZFS_TIME_DECODE(&vap
->va_atime
, atime
);
2550 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2551 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2553 mutex_exit(&zp
->z_lock
);
2555 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2557 if (zp
->z_blksz
== 0) {
2559 * Block size hasn't been set; suggest maximal I/O transfers.
2561 vap
->va_blksize
= zsb
->z_max_blksz
;
2567 EXPORT_SYMBOL(zfs_getattr
);
2570 * Get the basic file attributes and place them in the provided kstat
2571 * structure. The inode is assumed to be the authoritative source
2572 * for most of the attributes. However, the znode currently has the
2573 * authoritative atime, blksize, and block count.
2575 * IN: ip - inode of file.
2577 * OUT: sp - kstat values.
2579 * RETURN: 0 (always succeeds)
2583 zfs_getattr_fast(struct inode
*ip
, struct kstat
*sp
)
2585 znode_t
*zp
= ITOZ(ip
);
2586 zfs_sb_t
*zsb
= ITOZSB(ip
);
2588 u_longlong_t nblocks
;
2593 mutex_enter(&zp
->z_lock
);
2595 generic_fillattr(ip
, sp
);
2597 sa_object_size(zp
->z_sa_hdl
, &blksize
, &nblocks
);
2598 sp
->blksize
= blksize
;
2599 sp
->blocks
= nblocks
;
2601 if (unlikely(zp
->z_blksz
== 0)) {
2603 * Block size hasn't been set; suggest maximal I/O transfers.
2605 sp
->blksize
= zsb
->z_max_blksz
;
2608 mutex_exit(&zp
->z_lock
);
2611 * Required to prevent NFS client from detecting different inode
2612 * numbers of snapshot root dentry before and after snapshot mount.
2614 if (zsb
->z_issnap
) {
2615 if (ip
->i_sb
->s_root
->d_inode
== ip
)
2616 sp
->ino
= ZFSCTL_INO_SNAPDIRS
-
2617 dmu_objset_id(zsb
->z_os
);
2624 EXPORT_SYMBOL(zfs_getattr_fast
);
2627 * Set the file attributes to the values contained in the
2630 * IN: ip - inode of file to be modified.
2631 * vap - new attribute values.
2632 * If ATTR_XVATTR set, then optional attrs are being set
2633 * flags - ATTR_UTIME set if non-default time values provided.
2634 * - ATTR_NOACLCHECK (CIFS context only).
2635 * cr - credentials of caller.
2637 * RETURN: 0 if success
2638 * error code if failure
2641 * ip - ctime updated, mtime updated if size changed.
2645 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2647 znode_t
*zp
= ITOZ(ip
);
2648 zfs_sb_t
*zsb
= ITOZSB(ip
);
2652 xvattr_t
*tmpxvattr
;
2653 uint_t mask
= vap
->va_mask
;
2654 uint_t saved_mask
= 0;
2657 uint64_t new_kuid
= 0, new_kgid
= 0, new_uid
, new_gid
;
2659 uint64_t mtime
[2], ctime
[2], atime
[2];
2661 int need_policy
= FALSE
;
2663 zfs_fuid_info_t
*fuidp
= NULL
;
2664 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2667 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2668 boolean_t fuid_dirtied
= B_FALSE
;
2669 sa_bulk_attr_t
*bulk
, *xattr_bulk
;
2670 int count
= 0, xattr_count
= 0;
2681 * Make sure that if we have ephemeral uid/gid or xvattr specified
2682 * that file system is at proper version level
2685 if (zsb
->z_use_fuids
== B_FALSE
&&
2686 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2687 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2688 (mask
& ATTR_XVATTR
))) {
2690 return (SET_ERROR(EINVAL
));
2693 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2695 return (SET_ERROR(EISDIR
));
2698 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2700 return (SET_ERROR(EINVAL
));
2704 * If this is an xvattr_t, then get a pointer to the structure of
2705 * optional attributes. If this is NULL, then we have a vattr_t.
2707 xoap
= xva_getxoptattr(xvap
);
2709 tmpxvattr
= kmem_alloc(sizeof (xvattr_t
), KM_SLEEP
);
2710 xva_init(tmpxvattr
);
2712 bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2713 xattr_bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2716 * Immutable files can only alter immutable bit and atime
2718 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2719 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2720 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2725 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2731 * Verify timestamps doesn't overflow 32 bits.
2732 * ZFS can handle large timestamps, but 32bit syscalls can't
2733 * handle times greater than 2039. This check should be removed
2734 * once large timestamps are fully supported.
2736 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2737 if (((mask
& ATTR_ATIME
) &&
2738 TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2739 ((mask
& ATTR_MTIME
) &&
2740 TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2750 /* Can this be moved to before the top label? */
2751 if (zfs_is_readonly(zsb
)) {
2757 * First validate permissions
2760 if (mask
& ATTR_SIZE
) {
2761 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2766 * XXX - Note, we are not providing any open
2767 * mode flags here (like FNDELAY), so we may
2768 * block if there are locks present... this
2769 * should be addressed in openat().
2771 /* XXX - would it be OK to generate a log record here? */
2772 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2777 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2778 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2779 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2780 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2781 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2782 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2783 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2784 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2785 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2789 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2790 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2795 * NOTE: even if a new mode is being set,
2796 * we may clear S_ISUID/S_ISGID bits.
2799 if (!(mask
& ATTR_MODE
))
2800 vap
->va_mode
= zp
->z_mode
;
2803 * Take ownership or chgrp to group we are a member of
2806 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2807 take_group
= (mask
& ATTR_GID
) &&
2808 zfs_groupmember(zsb
, vap
->va_gid
, cr
);
2811 * If both ATTR_UID and ATTR_GID are set then take_owner and
2812 * take_group must both be set in order to allow taking
2815 * Otherwise, send the check through secpolicy_vnode_setattr()
2819 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2820 take_owner
&& take_group
) ||
2821 ((idmask
== ATTR_UID
) && take_owner
) ||
2822 ((idmask
== ATTR_GID
) && take_group
)) {
2823 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2824 skipaclchk
, cr
) == 0) {
2826 * Remove setuid/setgid for non-privileged users
2828 (void) secpolicy_setid_clear(vap
, cr
);
2829 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2838 mutex_enter(&zp
->z_lock
);
2839 oldva
.va_mode
= zp
->z_mode
;
2840 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2841 if (mask
& ATTR_XVATTR
) {
2843 * Update xvattr mask to include only those attributes
2844 * that are actually changing.
2846 * the bits will be restored prior to actually setting
2847 * the attributes so the caller thinks they were set.
2849 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2850 if (xoap
->xoa_appendonly
!=
2851 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2854 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2855 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2859 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2860 if (xoap
->xoa_nounlink
!=
2861 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2864 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2865 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2869 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2870 if (xoap
->xoa_immutable
!=
2871 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2874 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2875 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2879 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2880 if (xoap
->xoa_nodump
!=
2881 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2884 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2885 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2889 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2890 if (xoap
->xoa_av_modified
!=
2891 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2894 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2895 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2899 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2900 if ((!S_ISREG(ip
->i_mode
) &&
2901 xoap
->xoa_av_quarantined
) ||
2902 xoap
->xoa_av_quarantined
!=
2903 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2906 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2907 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2911 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2912 mutex_exit(&zp
->z_lock
);
2917 if (need_policy
== FALSE
&&
2918 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2919 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2924 mutex_exit(&zp
->z_lock
);
2926 if (mask
& ATTR_MODE
) {
2927 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2928 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2933 trim_mask
|= ATTR_MODE
;
2941 * If trim_mask is set then take ownership
2942 * has been granted or write_acl is present and user
2943 * has the ability to modify mode. In that case remove
2944 * UID|GID and or MODE from mask so that
2945 * secpolicy_vnode_setattr() doesn't revoke it.
2949 saved_mask
= vap
->va_mask
;
2950 vap
->va_mask
&= ~trim_mask
;
2952 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2953 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2958 vap
->va_mask
|= saved_mask
;
2962 * secpolicy_vnode_setattr, or take ownership may have
2965 mask
= vap
->va_mask
;
2967 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2968 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
2969 &xattr_obj
, sizeof (xattr_obj
));
2971 if (err
== 0 && xattr_obj
) {
2972 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
2976 if (mask
& ATTR_UID
) {
2977 new_kuid
= zfs_fuid_create(zsb
,
2978 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
2979 if (new_kuid
!= KUID_TO_SUID(ZTOI(zp
)->i_uid
) &&
2980 zfs_fuid_overquota(zsb
, B_FALSE
, new_kuid
)) {
2988 if (mask
& ATTR_GID
) {
2989 new_kgid
= zfs_fuid_create(zsb
, (uint64_t)vap
->va_gid
,
2990 cr
, ZFS_GROUP
, &fuidp
);
2991 if (new_kgid
!= KGID_TO_SGID(ZTOI(zp
)->i_gid
) &&
2992 zfs_fuid_overquota(zsb
, B_TRUE
, new_kgid
)) {
3000 tx
= dmu_tx_create(zsb
->z_os
);
3002 if (mask
& ATTR_MODE
) {
3003 uint64_t pmode
= zp
->z_mode
;
3005 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
3007 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
3009 mutex_enter(&zp
->z_lock
);
3010 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
3012 * Are we upgrading ACL from old V0 format
3015 if (zsb
->z_version
>= ZPL_VERSION_FUID
&&
3016 zfs_znode_acl_version(zp
) ==
3017 ZFS_ACL_VERSION_INITIAL
) {
3018 dmu_tx_hold_free(tx
, acl_obj
, 0,
3020 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
3021 0, aclp
->z_acl_bytes
);
3023 dmu_tx_hold_write(tx
, acl_obj
, 0,
3026 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3027 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
3028 0, aclp
->z_acl_bytes
);
3030 mutex_exit(&zp
->z_lock
);
3031 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
3033 if ((mask
& ATTR_XVATTR
) &&
3034 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
3035 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
3037 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3041 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
3044 fuid_dirtied
= zsb
->z_fuid_dirty
;
3046 zfs_fuid_txhold(zsb
, tx
);
3048 zfs_sa_upgrade_txholds(tx
, zp
);
3050 err
= dmu_tx_assign(tx
, TXG_WAIT
);
3056 * Set each attribute requested.
3057 * We group settings according to the locks they need to acquire.
3059 * Note: you cannot set ctime directly, although it will be
3060 * updated as a side-effect of calling this function.
3064 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3065 mutex_enter(&zp
->z_acl_lock
);
3066 mutex_enter(&zp
->z_lock
);
3068 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
3069 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
3072 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3073 mutex_enter(&attrzp
->z_acl_lock
);
3074 mutex_enter(&attrzp
->z_lock
);
3075 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3076 SA_ZPL_FLAGS(zsb
), NULL
, &attrzp
->z_pflags
,
3077 sizeof (attrzp
->z_pflags
));
3080 if (mask
& (ATTR_UID
|ATTR_GID
)) {
3082 if (mask
& ATTR_UID
) {
3083 ZTOI(zp
)->i_uid
= SUID_TO_KUID(new_kuid
);
3084 new_uid
= zfs_uid_read(ZTOI(zp
));
3085 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zsb
), NULL
,
3086 &new_uid
, sizeof (new_uid
));
3088 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3089 SA_ZPL_UID(zsb
), NULL
, &new_uid
,
3091 ZTOI(attrzp
)->i_uid
= SUID_TO_KUID(new_uid
);
3095 if (mask
& ATTR_GID
) {
3096 ZTOI(zp
)->i_gid
= SGID_TO_KGID(new_kgid
);
3097 new_gid
= zfs_gid_read(ZTOI(zp
));
3098 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zsb
),
3099 NULL
, &new_gid
, sizeof (new_gid
));
3101 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3102 SA_ZPL_GID(zsb
), NULL
, &new_gid
,
3104 ZTOI(attrzp
)->i_gid
= SGID_TO_KGID(new_kgid
);
3107 if (!(mask
& ATTR_MODE
)) {
3108 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
),
3109 NULL
, &new_mode
, sizeof (new_mode
));
3110 new_mode
= zp
->z_mode
;
3112 err
= zfs_acl_chown_setattr(zp
);
3115 err
= zfs_acl_chown_setattr(attrzp
);
3120 if (mask
& ATTR_MODE
) {
3121 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
), NULL
,
3122 &new_mode
, sizeof (new_mode
));
3123 zp
->z_mode
= ZTOI(zp
)->i_mode
= new_mode
;
3124 ASSERT3P(aclp
, !=, NULL
);
3125 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
3127 if (zp
->z_acl_cached
)
3128 zfs_acl_free(zp
->z_acl_cached
);
3129 zp
->z_acl_cached
= aclp
;
3133 if ((mask
& ATTR_ATIME
) || zp
->z_atime_dirty
) {
3134 zp
->z_atime_dirty
= 0;
3135 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
3136 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
,
3137 &atime
, sizeof (atime
));
3140 if (mask
& ATTR_MTIME
) {
3141 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
3142 ZTOI(zp
)->i_mtime
= timespec_trunc(vap
->va_mtime
,
3143 ZTOI(zp
)->i_sb
->s_time_gran
);
3145 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
3146 mtime
, sizeof (mtime
));
3149 if (mask
& ATTR_CTIME
) {
3150 ZFS_TIME_ENCODE(&vap
->va_ctime
, ctime
);
3151 ZTOI(zp
)->i_ctime
= timespec_trunc(vap
->va_ctime
,
3152 ZTOI(zp
)->i_sb
->s_time_gran
);
3153 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
3154 ctime
, sizeof (ctime
));
3157 if (attrzp
&& mask
) {
3158 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3159 SA_ZPL_CTIME(zsb
), NULL
, &ctime
,
3164 * Do this after setting timestamps to prevent timestamp
3165 * update from toggling bit
3168 if (xoap
&& (mask
& ATTR_XVATTR
)) {
3171 * restore trimmed off masks
3172 * so that return masks can be set for caller.
3175 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
3176 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
3178 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
3179 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
3181 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
3182 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
3184 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
3185 XVA_SET_REQ(xvap
, XAT_NODUMP
);
3187 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
3188 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
3190 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
3191 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
3194 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
3195 ASSERT(S_ISREG(ip
->i_mode
));
3197 zfs_xvattr_set(zp
, xvap
, tx
);
3201 zfs_fuid_sync(zsb
, tx
);
3204 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
3206 mutex_exit(&zp
->z_lock
);
3207 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3208 mutex_exit(&zp
->z_acl_lock
);
3211 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3212 mutex_exit(&attrzp
->z_acl_lock
);
3213 mutex_exit(&attrzp
->z_lock
);
3216 if (err
== 0 && attrzp
) {
3217 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
3228 zfs_fuid_info_free(fuidp
);
3234 if (err
== ERESTART
)
3237 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
3239 zfs_inode_update(zp
);
3243 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3244 zil_commit(zilog
, 0);
3247 kmem_free(xattr_bulk
, sizeof (sa_bulk_attr_t
) * 7);
3248 kmem_free(bulk
, sizeof (sa_bulk_attr_t
) * 7);
3249 kmem_free(tmpxvattr
, sizeof (xvattr_t
));
3253 EXPORT_SYMBOL(zfs_setattr
);
3255 typedef struct zfs_zlock
{
3256 krwlock_t
*zl_rwlock
; /* lock we acquired */
3257 znode_t
*zl_znode
; /* znode we held */
3258 struct zfs_zlock
*zl_next
; /* next in list */
3262 * Drop locks and release vnodes that were held by zfs_rename_lock().
3265 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
3269 while ((zl
= *zlpp
) != NULL
) {
3270 if (zl
->zl_znode
!= NULL
)
3271 iput(ZTOI(zl
->zl_znode
));
3272 rw_exit(zl
->zl_rwlock
);
3273 *zlpp
= zl
->zl_next
;
3274 kmem_free(zl
, sizeof (*zl
));
3279 * Search back through the directory tree, using the ".." entries.
3280 * Lock each directory in the chain to prevent concurrent renames.
3281 * Fail any attempt to move a directory into one of its own descendants.
3282 * XXX - z_parent_lock can overlap with map or grow locks
3285 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
3289 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
3290 uint64_t oidp
= zp
->z_id
;
3291 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
3292 krw_t rw
= RW_WRITER
;
3295 * First pass write-locks szp and compares to zp->z_id.
3296 * Later passes read-lock zp and compare to zp->z_parent.
3299 if (!rw_tryenter(rwlp
, rw
)) {
3301 * Another thread is renaming in this path.
3302 * Note that if we are a WRITER, we don't have any
3303 * parent_locks held yet.
3305 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
3307 * Drop our locks and restart
3309 zfs_rename_unlock(&zl
);
3313 rwlp
= &szp
->z_parent_lock
;
3318 * Wait for other thread to drop its locks
3324 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
3325 zl
->zl_rwlock
= rwlp
;
3326 zl
->zl_znode
= NULL
;
3327 zl
->zl_next
= *zlpp
;
3330 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
3331 return (SET_ERROR(EINVAL
));
3333 if (oidp
== rootid
) /* We've hit the top */
3336 if (rw
== RW_READER
) { /* i.e. not the first pass */
3337 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
3342 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
3343 &oidp
, sizeof (oidp
));
3344 rwlp
= &zp
->z_parent_lock
;
3347 } while (zp
->z_id
!= sdzp
->z_id
);
3353 * Move an entry from the provided source directory to the target
3354 * directory. Change the entry name as indicated.
3356 * IN: sdip - Source directory containing the "old entry".
3357 * snm - Old entry name.
3358 * tdip - Target directory to contain the "new entry".
3359 * tnm - New entry name.
3360 * cr - credentials of caller.
3361 * flags - case flags
3363 * RETURN: 0 on success, error code on failure.
3366 * sdip,tdip - ctime|mtime updated
3370 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
3371 cred_t
*cr
, int flags
)
3373 znode_t
*tdzp
, *szp
, *tzp
;
3374 znode_t
*sdzp
= ITOZ(sdip
);
3375 zfs_sb_t
*zsb
= ITOZSB(sdip
);
3377 zfs_dirlock_t
*sdl
, *tdl
;
3380 int cmp
, serr
, terr
;
3383 boolean_t waited
= B_FALSE
;
3386 ZFS_VERIFY_ZP(sdzp
);
3390 ZFS_VERIFY_ZP(tdzp
);
3393 * We check i_sb because snapshots and the ctldir must have different
3396 if (tdip
->i_sb
!= sdip
->i_sb
|| zfsctl_is_node(tdip
)) {
3398 return (SET_ERROR(EXDEV
));
3401 if (zsb
->z_utf8
&& u8_validate(tnm
,
3402 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3404 return (SET_ERROR(EILSEQ
));
3407 if (flags
& FIGNORECASE
)
3416 * This is to prevent the creation of links into attribute space
3417 * by renaming a linked file into/outof an attribute directory.
3418 * See the comment in zfs_link() for why this is considered bad.
3420 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3422 return (SET_ERROR(EINVAL
));
3426 * Lock source and target directory entries. To prevent deadlock,
3427 * a lock ordering must be defined. We lock the directory with
3428 * the smallest object id first, or if it's a tie, the one with
3429 * the lexically first name.
3431 if (sdzp
->z_id
< tdzp
->z_id
) {
3433 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3437 * First compare the two name arguments without
3438 * considering any case folding.
3440 int nofold
= (zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3442 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3443 ASSERT(error
== 0 || !zsb
->z_utf8
);
3446 * POSIX: "If the old argument and the new argument
3447 * both refer to links to the same existing file,
3448 * the rename() function shall return successfully
3449 * and perform no other action."
3455 * If the file system is case-folding, then we may
3456 * have some more checking to do. A case-folding file
3457 * system is either supporting mixed case sensitivity
3458 * access or is completely case-insensitive. Note
3459 * that the file system is always case preserving.
3461 * In mixed sensitivity mode case sensitive behavior
3462 * is the default. FIGNORECASE must be used to
3463 * explicitly request case insensitive behavior.
3465 * If the source and target names provided differ only
3466 * by case (e.g., a request to rename 'tim' to 'Tim'),
3467 * we will treat this as a special case in the
3468 * case-insensitive mode: as long as the source name
3469 * is an exact match, we will allow this to proceed as
3470 * a name-change request.
3472 if ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
||
3473 (zsb
->z_case
== ZFS_CASE_MIXED
&&
3474 flags
& FIGNORECASE
)) &&
3475 u8_strcmp(snm
, tnm
, 0, zsb
->z_norm
, U8_UNICODE_LATEST
,
3478 * case preserving rename request, require exact
3487 * If the source and destination directories are the same, we should
3488 * grab the z_name_lock of that directory only once.
3492 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3496 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3497 ZEXISTS
| zflg
, NULL
, NULL
);
3498 terr
= zfs_dirent_lock(&tdl
,
3499 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3501 terr
= zfs_dirent_lock(&tdl
,
3502 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3503 serr
= zfs_dirent_lock(&sdl
,
3504 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3510 * Source entry invalid or not there.
3513 zfs_dirent_unlock(tdl
);
3519 rw_exit(&sdzp
->z_name_lock
);
3521 if (strcmp(snm
, "..") == 0)
3527 zfs_dirent_unlock(sdl
);
3531 rw_exit(&sdzp
->z_name_lock
);
3533 if (strcmp(tnm
, "..") == 0)
3540 * Must have write access at the source to remove the old entry
3541 * and write access at the target to create the new entry.
3542 * Note that if target and source are the same, this can be
3543 * done in a single check.
3546 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3549 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3551 * Check to make sure rename is valid.
3552 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3554 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3559 * Does target exist?
3563 * Source and target must be the same type.
3565 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3566 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3567 error
= SET_ERROR(ENOTDIR
);
3571 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3572 error
= SET_ERROR(EISDIR
);
3577 * POSIX dictates that when the source and target
3578 * entries refer to the same file object, rename
3579 * must do nothing and exit without error.
3581 if (szp
->z_id
== tzp
->z_id
) {
3587 tx
= dmu_tx_create(zsb
->z_os
);
3588 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3589 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3590 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3591 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3593 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3594 zfs_sa_upgrade_txholds(tx
, tdzp
);
3597 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3598 zfs_sa_upgrade_txholds(tx
, tzp
);
3601 zfs_sa_upgrade_txholds(tx
, szp
);
3602 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
3603 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3606 zfs_rename_unlock(&zl
);
3607 zfs_dirent_unlock(sdl
);
3608 zfs_dirent_unlock(tdl
);
3611 rw_exit(&sdzp
->z_name_lock
);
3616 if (error
== ERESTART
) {
3627 if (tzp
) /* Attempt to remove the existing target */
3628 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3631 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3633 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3635 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zsb
),
3636 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3639 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3641 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3642 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3643 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3646 * At this point, we have successfully created
3647 * the target name, but have failed to remove
3648 * the source name. Since the create was done
3649 * with the ZRENAMING flag, there are
3650 * complications; for one, the link count is
3651 * wrong. The easiest way to deal with this
3652 * is to remove the newly created target, and
3653 * return the original error. This must
3654 * succeed; fortunately, it is very unlikely to
3655 * fail, since we just created it.
3657 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3658 ZRENAMING
, NULL
), ==, 0);
3666 zfs_rename_unlock(&zl
);
3668 zfs_dirent_unlock(sdl
);
3669 zfs_dirent_unlock(tdl
);
3671 zfs_inode_update(sdzp
);
3673 rw_exit(&sdzp
->z_name_lock
);
3676 zfs_inode_update(tdzp
);
3678 zfs_inode_update(szp
);
3681 zfs_inode_update(tzp
);
3685 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3686 zil_commit(zilog
, 0);
3691 EXPORT_SYMBOL(zfs_rename
);
3694 * Insert the indicated symbolic reference entry into the directory.
3696 * IN: dip - Directory to contain new symbolic link.
3697 * link - Name for new symlink entry.
3698 * vap - Attributes of new entry.
3699 * target - Target path of new symlink.
3701 * cr - credentials of caller.
3702 * flags - case flags
3704 * RETURN: 0 on success, error code on failure.
3707 * dip - ctime|mtime updated
3711 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3712 struct inode
**ipp
, cred_t
*cr
, int flags
)
3714 znode_t
*zp
, *dzp
= ITOZ(dip
);
3717 zfs_sb_t
*zsb
= ITOZSB(dip
);
3719 uint64_t len
= strlen(link
);
3722 zfs_acl_ids_t acl_ids
;
3723 boolean_t fuid_dirtied
;
3724 uint64_t txtype
= TX_SYMLINK
;
3725 boolean_t waited
= B_FALSE
;
3727 ASSERT(S_ISLNK(vap
->va_mode
));
3733 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
3734 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3736 return (SET_ERROR(EILSEQ
));
3738 if (flags
& FIGNORECASE
)
3741 if (len
> MAXPATHLEN
) {
3743 return (SET_ERROR(ENAMETOOLONG
));
3746 if ((error
= zfs_acl_ids_create(dzp
, 0,
3747 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3755 * Attempt to lock directory; fail if entry already exists.
3757 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3759 zfs_acl_ids_free(&acl_ids
);
3764 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3765 zfs_acl_ids_free(&acl_ids
);
3766 zfs_dirent_unlock(dl
);
3771 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
3772 zfs_acl_ids_free(&acl_ids
);
3773 zfs_dirent_unlock(dl
);
3775 return (SET_ERROR(EDQUOT
));
3777 tx
= dmu_tx_create(zsb
->z_os
);
3778 fuid_dirtied
= zsb
->z_fuid_dirty
;
3779 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3780 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3781 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3782 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3783 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3784 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3785 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3786 acl_ids
.z_aclp
->z_acl_bytes
);
3789 zfs_fuid_txhold(zsb
, tx
);
3790 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3792 zfs_dirent_unlock(dl
);
3793 if (error
== ERESTART
) {
3799 zfs_acl_ids_free(&acl_ids
);
3806 * Create a new object for the symlink.
3807 * for version 4 ZPL datsets the symlink will be an SA attribute
3809 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3812 zfs_fuid_sync(zsb
, tx
);
3814 mutex_enter(&zp
->z_lock
);
3816 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zsb
),
3819 zfs_sa_symlink(zp
, link
, len
, tx
);
3820 mutex_exit(&zp
->z_lock
);
3823 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
3824 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3826 * Insert the new object into the directory.
3828 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3830 if (flags
& FIGNORECASE
)
3832 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3834 zfs_inode_update(dzp
);
3835 zfs_inode_update(zp
);
3837 zfs_acl_ids_free(&acl_ids
);
3841 zfs_dirent_unlock(dl
);
3845 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3846 zil_commit(zilog
, 0);
3851 EXPORT_SYMBOL(zfs_symlink
);
3854 * Return, in the buffer contained in the provided uio structure,
3855 * the symbolic path referred to by ip.
3857 * IN: ip - inode of symbolic link
3858 * uio - structure to contain the link path.
3859 * cr - credentials of caller.
3861 * RETURN: 0 if success
3862 * error code if failure
3865 * ip - atime updated
3869 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3871 znode_t
*zp
= ITOZ(ip
);
3872 zfs_sb_t
*zsb
= ITOZSB(ip
);
3878 mutex_enter(&zp
->z_lock
);
3880 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3881 SA_ZPL_SYMLINK(zsb
), uio
);
3883 error
= zfs_sa_readlink(zp
, uio
);
3884 mutex_exit(&zp
->z_lock
);
3889 EXPORT_SYMBOL(zfs_readlink
);
3892 * Insert a new entry into directory tdip referencing sip.
3894 * IN: tdip - Directory to contain new entry.
3895 * sip - inode of new entry.
3896 * name - name of new entry.
3897 * cr - credentials of caller.
3899 * RETURN: 0 if success
3900 * error code if failure
3903 * tdip - ctime|mtime updated
3904 * sip - ctime updated
3908 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
,
3911 znode_t
*dzp
= ITOZ(tdip
);
3913 zfs_sb_t
*zsb
= ITOZSB(tdip
);
3921 boolean_t waited
= B_FALSE
;
3922 boolean_t is_tmpfile
= 0;
3925 is_tmpfile
= (sip
->i_nlink
== 0 && (sip
->i_state
& I_LINKABLE
));
3927 ASSERT(S_ISDIR(tdip
->i_mode
));
3934 * POSIX dictates that we return EPERM here.
3935 * Better choices include ENOTSUP or EISDIR.
3937 if (S_ISDIR(sip
->i_mode
)) {
3939 return (SET_ERROR(EPERM
));
3946 * We check i_sb because snapshots and the ctldir must have different
3949 if (sip
->i_sb
!= tdip
->i_sb
|| zfsctl_is_node(sip
)) {
3951 return (SET_ERROR(EXDEV
));
3954 /* Prevent links to .zfs/shares files */
3956 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
3957 &parent
, sizeof (uint64_t))) != 0) {
3961 if (parent
== zsb
->z_shares_dir
) {
3963 return (SET_ERROR(EPERM
));
3966 if (zsb
->z_utf8
&& u8_validate(name
,
3967 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3969 return (SET_ERROR(EILSEQ
));
3971 if (flags
& FIGNORECASE
)
3975 * We do not support links between attributes and non-attributes
3976 * because of the potential security risk of creating links
3977 * into "normal" file space in order to circumvent restrictions
3978 * imposed in attribute space.
3980 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
3982 return (SET_ERROR(EINVAL
));
3985 owner
= zfs_fuid_map_id(zsb
, KUID_TO_SUID(sip
->i_uid
), cr
, ZFS_OWNER
);
3986 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
3988 return (SET_ERROR(EPERM
));
3991 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3998 * Attempt to lock directory; fail if entry already exists.
4000 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
4006 tx
= dmu_tx_create(zsb
->z_os
);
4007 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
4008 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
4010 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
4012 zfs_sa_upgrade_txholds(tx
, szp
);
4013 zfs_sa_upgrade_txholds(tx
, dzp
);
4014 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
4016 zfs_dirent_unlock(dl
);
4017 if (error
== ERESTART
) {
4027 /* unmark z_unlinked so zfs_link_create will not reject */
4029 szp
->z_unlinked
= 0;
4030 error
= zfs_link_create(dl
, szp
, tx
, 0);
4033 uint64_t txtype
= TX_LINK
;
4035 * tmpfile is created to be in z_unlinkedobj, so remove it.
4036 * Also, we don't log in ZIL, be cause all previous file
4037 * operation on the tmpfile are ignored by ZIL. Instead we
4038 * always wait for txg to sync to make sure all previous
4039 * operation are sync safe.
4042 VERIFY(zap_remove_int(zsb
->z_os
, zsb
->z_unlinkedobj
,
4043 szp
->z_id
, tx
) == 0);
4045 if (flags
& FIGNORECASE
)
4047 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
4049 } else if (is_tmpfile
) {
4050 /* restore z_unlinked since when linking failed */
4051 szp
->z_unlinked
= 1;
4053 txg
= dmu_tx_get_txg(tx
);
4056 zfs_dirent_unlock(dl
);
4058 if (!is_tmpfile
&& zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4059 zil_commit(zilog
, 0);
4062 txg_wait_synced(dmu_objset_pool(zsb
->z_os
), txg
);
4064 zfs_inode_update(dzp
);
4065 zfs_inode_update(szp
);
4069 EXPORT_SYMBOL(zfs_link
);
4072 zfs_putpage_commit_cb(void *arg
)
4074 struct page
*pp
= arg
;
4077 end_page_writeback(pp
);
4081 * Push a page out to disk, once the page is on stable storage the
4082 * registered commit callback will be run as notification of completion.
4084 * IN: ip - page mapped for inode.
4085 * pp - page to push (page is locked)
4086 * wbc - writeback control data
4088 * RETURN: 0 if success
4089 * error code if failure
4092 * ip - ctime|mtime updated
4096 zfs_putpage(struct inode
*ip
, struct page
*pp
, struct writeback_control
*wbc
)
4098 znode_t
*zp
= ITOZ(ip
);
4099 zfs_sb_t
*zsb
= ITOZSB(ip
);
4107 uint64_t mtime
[2], ctime
[2];
4108 sa_bulk_attr_t bulk
[3];
4110 struct address_space
*mapping
;
4115 ASSERT(PageLocked(pp
));
4117 pgoff
= page_offset(pp
); /* Page byte-offset in file */
4118 offset
= i_size_read(ip
); /* File length in bytes */
4119 pglen
= MIN(PAGE_SIZE
, /* Page length in bytes */
4120 P2ROUNDUP(offset
, PAGE_SIZE
)-pgoff
);
4122 /* Page is beyond end of file */
4123 if (pgoff
>= offset
) {
4129 /* Truncate page length to end of file */
4130 if (pgoff
+ pglen
> offset
)
4131 pglen
= offset
- pgoff
;
4135 * FIXME: Allow mmap writes past its quota. The correct fix
4136 * is to register a page_mkwrite() handler to count the page
4137 * against its quota when it is about to be dirtied.
4139 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
4140 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
4146 * The ordering here is critical and must adhere to the following
4147 * rules in order to avoid deadlocking in either zfs_read() or
4148 * zfs_free_range() due to a lock inversion.
4150 * 1) The page must be unlocked prior to acquiring the range lock.
4151 * This is critical because zfs_read() calls find_lock_page()
4152 * which may block on the page lock while holding the range lock.
4154 * 2) Before setting or clearing write back on a page the range lock
4155 * must be held in order to prevent a lock inversion with the
4156 * zfs_free_range() function.
4158 * This presents a problem because upon entering this function the
4159 * page lock is already held. To safely acquire the range lock the
4160 * page lock must be dropped. This creates a window where another
4161 * process could truncate, invalidate, dirty, or write out the page.
4163 * Therefore, after successfully reacquiring the range and page locks
4164 * the current page state is checked. In the common case everything
4165 * will be as is expected and it can be written out. However, if
4166 * the page state has changed it must be handled accordingly.
4168 mapping
= pp
->mapping
;
4169 redirty_page_for_writepage(wbc
, pp
);
4172 rl
= zfs_range_lock(&zp
->z_range_lock
, pgoff
, pglen
, RL_WRITER
);
4175 /* Page mapping changed or it was no longer dirty, we're done */
4176 if (unlikely((mapping
!= pp
->mapping
) || !PageDirty(pp
))) {
4178 zfs_range_unlock(rl
);
4183 /* Another process started write block if required */
4184 if (PageWriteback(pp
)) {
4186 zfs_range_unlock(rl
);
4188 if (wbc
->sync_mode
!= WB_SYNC_NONE
)
4189 wait_on_page_writeback(pp
);
4195 /* Clear the dirty flag the required locks are held */
4196 if (!clear_page_dirty_for_io(pp
)) {
4198 zfs_range_unlock(rl
);
4204 * Counterpart for redirty_page_for_writepage() above. This page
4205 * was in fact not skipped and should not be counted as if it were.
4207 wbc
->pages_skipped
--;
4208 set_page_writeback(pp
);
4211 tx
= dmu_tx_create(zsb
->z_os
);
4212 dmu_tx_hold_write(tx
, zp
->z_id
, pgoff
, pglen
);
4213 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4214 zfs_sa_upgrade_txholds(tx
, zp
);
4216 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
4218 if (err
== ERESTART
)
4222 __set_page_dirty_nobuffers(pp
);
4224 end_page_writeback(pp
);
4225 zfs_range_unlock(rl
);
4231 ASSERT3U(pglen
, <=, PAGE_SIZE
);
4232 dmu_write(zsb
->z_os
, zp
->z_id
, pgoff
, pglen
, va
, tx
);
4235 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
4236 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
4237 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_FLAGS(zsb
), NULL
, &zp
->z_pflags
, 8);
4239 /* Preserve the mtime and ctime provided by the inode */
4240 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4241 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4242 zp
->z_atime_dirty
= 0;
4245 err
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4247 zfs_log_write(zsb
->z_log
, tx
, TX_WRITE
, zp
, pgoff
, pglen
, 0,
4248 zfs_putpage_commit_cb
, pp
);
4251 zfs_range_unlock(rl
);
4253 if (wbc
->sync_mode
!= WB_SYNC_NONE
) {
4255 * Note that this is rarely called under writepages(), because
4256 * writepages() normally handles the entire commit for
4257 * performance reasons.
4259 zil_commit(zsb
->z_log
, zp
->z_id
);
4267 * Update the system attributes when the inode has been dirtied. For the
4268 * moment we only update the mode, atime, mtime, and ctime.
4271 zfs_dirty_inode(struct inode
*ip
, int flags
)
4273 znode_t
*zp
= ITOZ(ip
);
4274 zfs_sb_t
*zsb
= ITOZSB(ip
);
4276 uint64_t mode
, atime
[2], mtime
[2], ctime
[2];
4277 sa_bulk_attr_t bulk
[4];
4281 if (zfs_is_readonly(zsb
) || dmu_objset_is_snapshot(zsb
->z_os
))
4289 * This is the lazytime semantic indroduced in Linux 4.0
4290 * This flag will only be called from update_time when lazytime is set.
4291 * (Note, I_DIRTY_SYNC will also set if not lazytime)
4292 * Fortunately mtime and ctime are managed within ZFS itself, so we
4293 * only need to dirty atime.
4295 if (flags
== I_DIRTY_TIME
) {
4296 zp
->z_atime_dirty
= 1;
4301 tx
= dmu_tx_create(zsb
->z_os
);
4303 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4304 zfs_sa_upgrade_txholds(tx
, zp
);
4306 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4312 mutex_enter(&zp
->z_lock
);
4313 zp
->z_atime_dirty
= 0;
4315 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MODE(zsb
), NULL
, &mode
, 8);
4316 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_ATIME(zsb
), NULL
, &atime
, 16);
4317 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
4318 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
4320 /* Preserve the mode, mtime and ctime provided by the inode */
4321 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4322 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4323 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4328 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4329 mutex_exit(&zp
->z_lock
);
4336 EXPORT_SYMBOL(zfs_dirty_inode
);
4340 zfs_inactive(struct inode
*ip
)
4342 znode_t
*zp
= ITOZ(ip
);
4343 zfs_sb_t
*zsb
= ITOZSB(ip
);
4346 int need_unlock
= 0;
4348 /* Only read lock if we haven't already write locked, e.g. rollback */
4349 if (!RW_WRITE_HELD(&zsb
->z_teardown_inactive_lock
)) {
4351 rw_enter(&zsb
->z_teardown_inactive_lock
, RW_READER
);
4353 if (zp
->z_sa_hdl
== NULL
) {
4355 rw_exit(&zsb
->z_teardown_inactive_lock
);
4359 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
4360 dmu_tx_t
*tx
= dmu_tx_create(zsb
->z_os
);
4362 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4363 zfs_sa_upgrade_txholds(tx
, zp
);
4364 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4368 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4369 mutex_enter(&zp
->z_lock
);
4370 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zsb
),
4371 (void *)&atime
, sizeof (atime
), tx
);
4372 zp
->z_atime_dirty
= 0;
4373 mutex_exit(&zp
->z_lock
);
4380 rw_exit(&zsb
->z_teardown_inactive_lock
);
4382 EXPORT_SYMBOL(zfs_inactive
);
4385 * Bounds-check the seek operation.
4387 * IN: ip - inode seeking within
4388 * ooff - old file offset
4389 * noffp - pointer to new file offset
4390 * ct - caller context
4392 * RETURN: 0 if success
4393 * EINVAL if new offset invalid
4397 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
4399 if (S_ISDIR(ip
->i_mode
))
4401 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
4403 EXPORT_SYMBOL(zfs_seek
);
4406 * Fill pages with data from the disk.
4409 zfs_fillpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4411 znode_t
*zp
= ITOZ(ip
);
4412 zfs_sb_t
*zsb
= ITOZSB(ip
);
4414 struct page
*cur_pp
;
4415 u_offset_t io_off
, total
;
4422 io_len
= nr_pages
<< PAGE_SHIFT
;
4423 i_size
= i_size_read(ip
);
4424 io_off
= page_offset(pl
[0]);
4426 if (io_off
+ io_len
> i_size
)
4427 io_len
= i_size
- io_off
;
4430 * Iterate over list of pages and read each page individually.
4433 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
4436 cur_pp
= pl
[page_idx
++];
4438 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
4442 /* convert checksum errors into IO errors */
4444 err
= SET_ERROR(EIO
);
4453 * Uses zfs_fillpage to read data from the file and fill the pages.
4455 * IN: ip - inode of file to get data from.
4456 * pl - list of pages to read
4457 * nr_pages - number of pages to read
4459 * RETURN: 0 on success, error code on failure.
4462 * vp - atime updated
4466 zfs_getpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4468 znode_t
*zp
= ITOZ(ip
);
4469 zfs_sb_t
*zsb
= ITOZSB(ip
);
4478 err
= zfs_fillpage(ip
, pl
, nr_pages
);
4483 EXPORT_SYMBOL(zfs_getpage
);
4486 * Check ZFS specific permissions to memory map a section of a file.
4488 * IN: ip - inode of the file to mmap
4490 * addrp - start address in memory region
4491 * len - length of memory region
4492 * vm_flags- address flags
4494 * RETURN: 0 if success
4495 * error code if failure
4499 zfs_map(struct inode
*ip
, offset_t off
, caddr_t
*addrp
, size_t len
,
4500 unsigned long vm_flags
)
4502 znode_t
*zp
= ITOZ(ip
);
4503 zfs_sb_t
*zsb
= ITOZSB(ip
);
4508 if ((vm_flags
& VM_WRITE
) && (zp
->z_pflags
&
4509 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4511 return (SET_ERROR(EPERM
));
4514 if ((vm_flags
& (VM_READ
| VM_EXEC
)) &&
4515 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4517 return (SET_ERROR(EACCES
));
4520 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4522 return (SET_ERROR(ENXIO
));
4528 EXPORT_SYMBOL(zfs_map
);
4531 * convoff - converts the given data (start, whence) to the
4535 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4540 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4541 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4545 switch (lckdat
->l_whence
) {
4547 lckdat
->l_start
+= offset
;
4550 lckdat
->l_start
+= vap
.va_size
;
4555 return (SET_ERROR(EINVAL
));
4558 if (lckdat
->l_start
< 0)
4559 return (SET_ERROR(EINVAL
));
4563 lckdat
->l_start
-= offset
;
4566 lckdat
->l_start
-= vap
.va_size
;
4571 return (SET_ERROR(EINVAL
));
4574 lckdat
->l_whence
= (short)whence
;
4579 * Free or allocate space in a file. Currently, this function only
4580 * supports the `F_FREESP' command. However, this command is somewhat
4581 * misnamed, as its functionality includes the ability to allocate as
4582 * well as free space.
4584 * IN: ip - inode of file to free data in.
4585 * cmd - action to take (only F_FREESP supported).
4586 * bfp - section of file to free/alloc.
4587 * flag - current file open mode flags.
4588 * offset - current file offset.
4589 * cr - credentials of caller [UNUSED].
4591 * RETURN: 0 on success, error code on failure.
4594 * ip - ctime|mtime updated
4598 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4599 offset_t offset
, cred_t
*cr
)
4601 znode_t
*zp
= ITOZ(ip
);
4602 zfs_sb_t
*zsb
= ITOZSB(ip
);
4609 if (cmd
!= F_FREESP
) {
4611 return (SET_ERROR(EINVAL
));
4615 * Callers might not be able to detect properly that we are read-only,
4616 * so check it explicitly here.
4618 if (zfs_is_readonly(zsb
)) {
4620 return (SET_ERROR(EROFS
));
4623 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4628 if (bfp
->l_len
< 0) {
4630 return (SET_ERROR(EINVAL
));
4634 * Permissions aren't checked on Solaris because on this OS
4635 * zfs_space() can only be called with an opened file handle.
4636 * On Linux we can get here through truncate_range() which
4637 * operates directly on inodes, so we need to check access rights.
4639 if ((error
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
))) {
4645 len
= bfp
->l_len
; /* 0 means from off to end of file */
4647 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4652 EXPORT_SYMBOL(zfs_space
);
4656 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4658 znode_t
*zp
= ITOZ(ip
);
4659 zfs_sb_t
*zsb
= ITOZSB(ip
);
4662 uint64_t object
= zp
->z_id
;
4669 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zsb
),
4670 &gen64
, sizeof (uint64_t))) != 0) {
4675 gen
= (uint32_t)gen64
;
4677 size
= (zsb
->z_parent
!= zsb
) ? LONG_FID_LEN
: SHORT_FID_LEN
;
4678 if (fidp
->fid_len
< size
) {
4679 fidp
->fid_len
= size
;
4681 return (SET_ERROR(ENOSPC
));
4684 zfid
= (zfid_short_t
*)fidp
;
4686 zfid
->zf_len
= size
;
4688 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4689 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4691 /* Must have a non-zero generation number to distinguish from .zfs */
4694 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4695 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4697 if (size
== LONG_FID_LEN
) {
4698 uint64_t objsetid
= dmu_objset_id(zsb
->z_os
);
4701 zlfid
= (zfid_long_t
*)fidp
;
4703 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
4704 zlfid
->zf_setid
[i
] = (uint8_t)(objsetid
>> (8 * i
));
4706 /* XXX - this should be the generation number for the objset */
4707 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
4708 zlfid
->zf_setgen
[i
] = 0;
4714 EXPORT_SYMBOL(zfs_fid
);
4718 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4720 znode_t
*zp
= ITOZ(ip
);
4721 zfs_sb_t
*zsb
= ITOZSB(ip
);
4723 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4727 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4732 EXPORT_SYMBOL(zfs_getsecattr
);
4736 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4738 znode_t
*zp
= ITOZ(ip
);
4739 zfs_sb_t
*zsb
= ITOZSB(ip
);
4741 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4742 zilog_t
*zilog
= zsb
->z_log
;
4747 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4749 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4750 zil_commit(zilog
, 0);
4755 EXPORT_SYMBOL(zfs_setsecattr
);
4757 #ifdef HAVE_UIO_ZEROCOPY
4759 * Tunable, both must be a power of 2.
4761 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4762 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4763 * an arcbuf for a partial block read
4765 int zcr_blksz_min
= (1 << 10); /* 1K */
4766 int zcr_blksz_max
= (1 << 17); /* 128K */
4770 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4772 znode_t
*zp
= ITOZ(ip
);
4773 zfs_sb_t
*zsb
= ITOZSB(ip
);
4774 int max_blksz
= zsb
->z_max_blksz
;
4775 uio_t
*uio
= &xuio
->xu_uio
;
4776 ssize_t size
= uio
->uio_resid
;
4777 offset_t offset
= uio
->uio_loffset
;
4782 int preamble
, postamble
;
4784 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4785 return (SET_ERROR(EINVAL
));
4792 * Loan out an arc_buf for write if write size is bigger than
4793 * max_blksz, and the file's block size is also max_blksz.
4796 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4798 return (SET_ERROR(EINVAL
));
4801 * Caller requests buffers for write before knowing where the
4802 * write offset might be (e.g. NFS TCP write).
4807 preamble
= P2PHASE(offset
, blksz
);
4809 preamble
= blksz
- preamble
;
4814 postamble
= P2PHASE(size
, blksz
);
4817 fullblk
= size
/ blksz
;
4818 (void) dmu_xuio_init(xuio
,
4819 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4822 * Have to fix iov base/len for partial buffers. They
4823 * currently represent full arc_buf's.
4826 /* data begins in the middle of the arc_buf */
4827 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4830 (void) dmu_xuio_add(xuio
, abuf
,
4831 blksz
- preamble
, preamble
);
4834 for (i
= 0; i
< fullblk
; i
++) {
4835 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4838 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4842 /* data ends in the middle of the arc_buf */
4843 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4846 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4851 * Loan out an arc_buf for read if the read size is larger than
4852 * the current file block size. Block alignment is not
4853 * considered. Partial arc_buf will be loaned out for read.
4855 blksz
= zp
->z_blksz
;
4856 if (blksz
< zcr_blksz_min
)
4857 blksz
= zcr_blksz_min
;
4858 if (blksz
> zcr_blksz_max
)
4859 blksz
= zcr_blksz_max
;
4860 /* avoid potential complexity of dealing with it */
4861 if (blksz
> max_blksz
) {
4863 return (SET_ERROR(EINVAL
));
4866 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4872 return (SET_ERROR(EINVAL
));
4877 return (SET_ERROR(EINVAL
));
4880 uio
->uio_extflg
= UIO_XUIO
;
4881 XUIO_XUZC_RW(xuio
) = ioflag
;
4888 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4892 int ioflag
= XUIO_XUZC_RW(xuio
);
4894 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4896 i
= dmu_xuio_cnt(xuio
);
4898 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4900 * if abuf == NULL, it must be a write buffer
4901 * that has been returned in zfs_write().
4904 dmu_return_arcbuf(abuf
);
4905 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4908 dmu_xuio_fini(xuio
);
4911 #endif /* HAVE_UIO_ZEROCOPY */
4913 #if defined(_KERNEL) && defined(HAVE_SPL)
4914 module_param(zfs_delete_blocks
, ulong
, 0644);
4915 MODULE_PARM_DESC(zfs_delete_blocks
, "Delete files larger than N blocks async");
4916 module_param(zfs_read_chunk_size
, long, 0644);
4917 MODULE_PARM_DESC(zfs_read_chunk_size
, "Bytes to read per chunk");