4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
26 /* Portions Copyright 2007 Jeremy Teo */
27 /* Portions Copyright 2010 Robert Milkowski */
30 #include <sys/types.h>
31 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/sysmacros.h>
35 #include <sys/resource.h>
37 #include <sys/vfs_opreg.h>
41 #include <sys/taskq.h>
43 #include <sys/vmsystm.h>
44 #include <sys/atomic.h>
46 #include <sys/pathname.h>
47 #include <sys/cmn_err.h>
48 #include <sys/errno.h>
49 #include <sys/unistd.h>
50 #include <sys/zfs_dir.h>
51 #include <sys/zfs_acl.h>
52 #include <sys/zfs_ioctl.h>
53 #include <sys/fs/zfs.h>
55 #include <sys/dmu_objset.h>
61 #include <sys/dirent.h>
62 #include <sys/policy.h>
63 #include <sys/sunddi.h>
66 #include "fs/fs_subr.h"
67 #include <sys/zfs_ctldir.h>
68 #include <sys/zfs_fuid.h>
69 #include <sys/zfs_sa.h>
70 #include <sys/zfs_vnops.h>
72 #include <sys/zfs_rlock.h>
73 #include <sys/extdirent.h>
74 #include <sys/kidmap.h>
82 * Each vnode op performs some logical unit of work. To do this, the ZPL must
83 * properly lock its in-core state, create a DMU transaction, do the work,
84 * record this work in the intent log (ZIL), commit the DMU transaction,
85 * and wait for the intent log to commit if it is a synchronous operation.
86 * Moreover, the vnode ops must work in both normal and log replay context.
87 * The ordering of events is important to avoid deadlocks and references
88 * to freed memory. The example below illustrates the following Big Rules:
90 * (1) A check must be made in each zfs thread for a mounted file system.
91 * This is done avoiding races using ZFS_ENTER(zsb).
92 * A ZFS_EXIT(zsb) is needed before all returns. Any znodes
93 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
94 * can return EIO from the calling function.
96 * (2) iput() should always be the last thing except for zil_commit()
97 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
98 * First, if it's the last reference, the vnode/znode
99 * can be freed, so the zp may point to freed memory. Second, the last
100 * reference will call zfs_zinactive(), which may induce a lot of work --
101 * pushing cached pages (which acquires range locks) and syncing out
102 * cached atime changes. Third, zfs_zinactive() may require a new tx,
103 * which could deadlock the system if you were already holding one.
104 * If you must call iput() within a tx then use iput_ASYNC().
106 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
107 * as they can span dmu_tx_assign() calls.
109 * (4) Always pass TXG_NOWAIT as the second argument to dmu_tx_assign().
110 * This is critical because we don't want to block while holding locks.
111 * Note, in particular, that if a lock is sometimes acquired before
112 * the tx assigns, and sometimes after (e.g. z_lock), then failing to
113 * use a non-blocking assign can deadlock the system. The scenario:
115 * Thread A has grabbed a lock before calling dmu_tx_assign().
116 * Thread B is in an already-assigned tx, and blocks for this lock.
117 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
118 * forever, because the previous txg can't quiesce until B's tx commits.
120 * If dmu_tx_assign() returns ERESTART and zsb->z_assign is TXG_NOWAIT,
121 * then drop all locks, call dmu_tx_wait(), and try again.
123 * (5) If the operation succeeded, generate the intent log entry for it
124 * before dropping locks. This ensures that the ordering of events
125 * in the intent log matches the order in which they actually occurred.
126 * During ZIL replay the zfs_log_* functions will update the sequence
127 * number to indicate the zil transaction has replayed.
129 * (6) At the end of each vnode op, the DMU tx must always commit,
130 * regardless of whether there were any errors.
132 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
133 * to ensure that synchronous semantics are provided when necessary.
135 * In general, this is how things should be ordered in each vnode op:
137 * ZFS_ENTER(zsb); // exit if unmounted
139 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
140 * rw_enter(...); // grab any other locks you need
141 * tx = dmu_tx_create(...); // get DMU tx
142 * dmu_tx_hold_*(); // hold each object you might modify
143 * error = dmu_tx_assign(tx, TXG_NOWAIT); // try to assign
145 * rw_exit(...); // drop locks
146 * zfs_dirent_unlock(dl); // unlock directory entry
147 * iput(...); // release held vnodes
148 * if (error == ERESTART) {
153 * dmu_tx_abort(tx); // abort DMU tx
154 * ZFS_EXIT(zsb); // finished in zfs
155 * return (error); // really out of space
157 * error = do_real_work(); // do whatever this VOP does
159 * zfs_log_*(...); // on success, make ZIL entry
160 * dmu_tx_commit(tx); // commit DMU tx -- error or not
161 * rw_exit(...); // drop locks
162 * zfs_dirent_unlock(dl); // unlock directory entry
163 * iput(...); // release held vnodes
164 * zil_commit(zilog, foid); // synchronous when necessary
165 * ZFS_EXIT(zsb); // finished in zfs
166 * return (error); // done, report error
170 * Virus scanning is unsupported. It would be possible to add a hook
171 * here to performance the required virus scan. This could be done
172 * entirely in the kernel or potentially as an update to invoke a
176 zfs_vscan(struct inode
*ip
, cred_t
*cr
, int async
)
183 zfs_open(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
185 znode_t
*zp
= ITOZ(ip
);
186 zfs_sb_t
*zsb
= ITOZSB(ip
);
191 /* Honor ZFS_APPENDONLY file attribute */
192 if ((mode
& FMODE_WRITE
) && (zp
->z_pflags
& ZFS_APPENDONLY
) &&
193 ((flag
& O_APPEND
) == 0)) {
198 /* Virus scan eligible files on open */
199 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
200 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0) {
201 if (zfs_vscan(ip
, cr
, 0) != 0) {
207 /* Keep a count of the synchronous opens in the znode */
209 atomic_inc_32(&zp
->z_sync_cnt
);
214 EXPORT_SYMBOL(zfs_open
);
218 zfs_close(struct inode
*ip
, int flag
, cred_t
*cr
)
220 znode_t
*zp
= ITOZ(ip
);
221 zfs_sb_t
*zsb
= ITOZSB(ip
);
227 * Zero the synchronous opens in the znode. Under Linux the
228 * zfs_close() hook is not symmetric with zfs_open(), it is
229 * only called once when the last reference is dropped.
234 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
235 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0)
236 VERIFY(zfs_vscan(ip
, cr
, 1) == 0);
241 EXPORT_SYMBOL(zfs_close
);
243 #if defined(SEEK_HOLE) && defined(SEEK_DATA)
245 * Lseek support for finding holes (cmd == SEEK_HOLE) and
246 * data (cmd == SEEK_DATA). "off" is an in/out parameter.
249 zfs_holey_common(struct inode
*ip
, int cmd
, loff_t
*off
)
251 znode_t
*zp
= ITOZ(ip
);
252 uint64_t noff
= (uint64_t)*off
; /* new offset */
257 file_sz
= zp
->z_size
;
258 if (noff
>= file_sz
) {
262 if (cmd
== SEEK_HOLE
)
267 error
= dmu_offset_next(ZTOZSB(zp
)->z_os
, zp
->z_id
, hole
, &noff
);
270 if ((error
== ESRCH
) || (noff
> file_sz
)) {
272 * Handle the virtual hole at the end of file.
288 zfs_holey(struct inode
*ip
, int cmd
, loff_t
*off
)
290 znode_t
*zp
= ITOZ(ip
);
291 zfs_sb_t
*zsb
= ITOZSB(ip
);
297 error
= zfs_holey_common(ip
, cmd
, off
);
302 EXPORT_SYMBOL(zfs_holey
);
303 #endif /* SEEK_HOLE && SEEK_DATA */
307 * When a file is memory mapped, we must keep the IO data synchronized
308 * between the DMU cache and the memory mapped pages. What this means:
310 * On Write: If we find a memory mapped page, we write to *both*
311 * the page and the dmu buffer.
314 update_pages(struct inode
*ip
, int64_t start
, int len
,
315 objset_t
*os
, uint64_t oid
)
317 struct address_space
*mp
= ip
->i_mapping
;
323 off
= start
& (PAGE_CACHE_SIZE
-1);
324 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
325 nbytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
327 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
329 if (mapping_writably_mapped(mp
))
330 flush_dcache_page(pp
);
333 (void) dmu_read(os
, oid
, start
+off
, nbytes
, pb
+off
,
337 if (mapping_writably_mapped(mp
))
338 flush_dcache_page(pp
);
340 mark_page_accessed(pp
);
344 page_cache_release(pp
);
353 * When a file is memory mapped, we must keep the IO data synchronized
354 * between the DMU cache and the memory mapped pages. What this means:
356 * On Read: We "read" preferentially from memory mapped pages,
357 * else we default from the dmu buffer.
359 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
360 * the file is memory mapped.
363 mappedread(struct inode
*ip
, int nbytes
, uio_t
*uio
)
365 struct address_space
*mp
= ip
->i_mapping
;
367 znode_t
*zp
= ITOZ(ip
);
368 objset_t
*os
= ITOZSB(ip
)->z_os
;
375 start
= uio
->uio_loffset
;
376 off
= start
& (PAGE_CACHE_SIZE
-1);
377 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
378 bytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
380 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
382 ASSERT(PageUptodate(pp
));
385 error
= uiomove(pb
+ off
, bytes
, UIO_READ
, uio
);
388 if (mapping_writably_mapped(mp
))
389 flush_dcache_page(pp
);
391 mark_page_accessed(pp
);
393 page_cache_release(pp
);
395 error
= dmu_read_uio(os
, zp
->z_id
, uio
, bytes
);
407 unsigned long zfs_read_chunk_size
= 1024 * 1024; /* Tunable */
410 * Read bytes from specified file into supplied buffer.
412 * IN: ip - inode of file to be read from.
413 * uio - structure supplying read location, range info,
415 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
416 * O_DIRECT flag; used to bypass page cache.
417 * cr - credentials of caller.
419 * OUT: uio - updated offset and range, buffer filled.
421 * RETURN: 0 if success
422 * error code if failure
425 * inode - atime updated if byte count > 0
429 zfs_read(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
431 znode_t
*zp
= ITOZ(ip
);
432 zfs_sb_t
*zsb
= ITOZSB(ip
);
437 #ifdef HAVE_UIO_ZEROCOPY
439 #endif /* HAVE_UIO_ZEROCOPY */
445 if (zp
->z_pflags
& ZFS_AV_QUARANTINED
) {
451 * Validate file offset
453 if (uio
->uio_loffset
< (offset_t
)0) {
459 * Fasttrack empty reads
461 if (uio
->uio_resid
== 0) {
467 * Check for mandatory locks
469 if (mandatory_lock(ip
) &&
470 !lock_may_read(ip
, uio
->uio_loffset
, uio
->uio_resid
)) {
476 * If we're in FRSYNC mode, sync out this znode before reading it.
478 if (ioflag
& FRSYNC
|| zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
479 zil_commit(zsb
->z_log
, zp
->z_id
);
482 * Lock the range against changes.
484 rl
= zfs_range_lock(zp
, uio
->uio_loffset
, uio
->uio_resid
, RL_READER
);
487 * If we are reading past end-of-file we can skip
488 * to the end; but we might still need to set atime.
490 if (uio
->uio_loffset
>= zp
->z_size
) {
495 ASSERT(uio
->uio_loffset
< zp
->z_size
);
496 n
= MIN(uio
->uio_resid
, zp
->z_size
- uio
->uio_loffset
);
498 #ifdef HAVE_UIO_ZEROCOPY
499 if ((uio
->uio_extflg
== UIO_XUIO
) &&
500 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
)) {
502 int blksz
= zp
->z_blksz
;
503 uint64_t offset
= uio
->uio_loffset
;
505 xuio
= (xuio_t
*)uio
;
507 nblk
= (P2ROUNDUP(offset
+ n
, blksz
) - P2ALIGN(offset
,
510 ASSERT(offset
+ n
<= blksz
);
513 (void) dmu_xuio_init(xuio
, nblk
);
515 if (vn_has_cached_data(ip
)) {
517 * For simplicity, we always allocate a full buffer
518 * even if we only expect to read a portion of a block.
520 while (--nblk
>= 0) {
521 (void) dmu_xuio_add(xuio
,
522 dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
527 #endif /* HAVE_UIO_ZEROCOPY */
530 nbytes
= MIN(n
, zfs_read_chunk_size
-
531 P2PHASE(uio
->uio_loffset
, zfs_read_chunk_size
));
533 if (zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
534 error
= mappedread(ip
, nbytes
, uio
);
536 error
= dmu_read_uio(os
, zp
->z_id
, uio
, nbytes
);
539 /* convert checksum errors into IO errors */
548 zfs_range_unlock(rl
);
550 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
551 zfs_inode_update(zp
);
555 EXPORT_SYMBOL(zfs_read
);
558 * Write the bytes to a file.
560 * IN: ip - inode of file to be written to.
561 * uio - structure supplying write location, range info,
563 * ioflag - FAPPEND flag set if in append mode.
564 * O_DIRECT flag; used to bypass page cache.
565 * cr - credentials of caller.
567 * OUT: uio - updated offset and range.
569 * RETURN: 0 if success
570 * error code if failure
573 * ip - ctime|mtime updated if byte count > 0
578 zfs_write(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
580 znode_t
*zp
= ITOZ(ip
);
581 rlim64_t limit
= uio
->uio_limit
;
582 ssize_t start_resid
= uio
->uio_resid
;
586 zfs_sb_t
*zsb
= ZTOZSB(zp
);
591 int max_blksz
= zsb
->z_max_blksz
;
594 iovec_t
*aiov
= NULL
;
597 iovec_t
*iovp
= uio
->uio_iov
;
600 sa_bulk_attr_t bulk
[4];
601 uint64_t mtime
[2], ctime
[2];
602 ASSERTV(int iovcnt
= uio
->uio_iovcnt
);
605 * Fasttrack empty write
611 if (limit
== RLIM64_INFINITY
|| limit
> MAXOFFSET_T
)
617 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
618 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
619 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
, &zp
->z_size
, 8);
620 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
624 * If immutable or not appending then return EPERM
626 if ((zp
->z_pflags
& (ZFS_IMMUTABLE
| ZFS_READONLY
)) ||
627 ((zp
->z_pflags
& ZFS_APPENDONLY
) && !(ioflag
& FAPPEND
) &&
628 (uio
->uio_loffset
< zp
->z_size
))) {
636 * Validate file offset
638 woff
= ioflag
& FAPPEND
? zp
->z_size
: uio
->uio_loffset
;
645 * Check for mandatory locks before calling zfs_range_lock()
646 * in order to prevent a deadlock with locks set via fcntl().
648 if (mandatory_lock(ip
) && !lock_may_write(ip
, woff
, n
)) {
654 * Pre-fault the pages to ensure slow (eg NFS) pages
656 * Skip this if uio contains loaned arc_buf.
658 #ifdef HAVE_UIO_ZEROCOPY
659 if ((uio
->uio_extflg
== UIO_XUIO
) &&
660 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
))
661 xuio
= (xuio_t
*)uio
;
664 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
667 * If in append mode, set the io offset pointer to eof.
669 if (ioflag
& FAPPEND
) {
671 * Obtain an appending range lock to guarantee file append
672 * semantics. We reset the write offset once we have the lock.
674 rl
= zfs_range_lock(zp
, 0, n
, RL_APPEND
);
676 if (rl
->r_len
== UINT64_MAX
) {
678 * We overlocked the file because this write will cause
679 * the file block size to increase.
680 * Note that zp_size cannot change with this lock held.
684 uio
->uio_loffset
= woff
;
687 * Note that if the file block size will change as a result of
688 * this write, then this range lock will lock the entire file
689 * so that we can re-write the block safely.
691 rl
= zfs_range_lock(zp
, woff
, n
, RL_WRITER
);
695 zfs_range_unlock(rl
);
700 if ((woff
+ n
) > limit
|| woff
> (limit
- n
))
703 /* Will this write extend the file length? */
704 write_eof
= (woff
+ n
> zp
->z_size
);
706 end_size
= MAX(zp
->z_size
, woff
+ n
);
709 * Write the file in reasonable size chunks. Each chunk is written
710 * in a separate transaction; this keeps the intent log records small
711 * and allows us to do more fine-grained space accounting.
715 woff
= uio
->uio_loffset
;
717 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
718 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
720 dmu_return_arcbuf(abuf
);
725 if (xuio
&& abuf
== NULL
) {
726 ASSERT(i_iov
< iovcnt
);
728 abuf
= dmu_xuio_arcbuf(xuio
, i_iov
);
729 dmu_xuio_clear(xuio
, i_iov
);
730 ASSERT((aiov
->iov_base
== abuf
->b_data
) ||
731 ((char *)aiov
->iov_base
- (char *)abuf
->b_data
+
732 aiov
->iov_len
== arc_buf_size(abuf
)));
734 } else if (abuf
== NULL
&& n
>= max_blksz
&&
735 woff
>= zp
->z_size
&&
736 P2PHASE(woff
, max_blksz
) == 0 &&
737 zp
->z_blksz
== max_blksz
) {
739 * This write covers a full block. "Borrow" a buffer
740 * from the dmu so that we can fill it before we enter
741 * a transaction. This avoids the possibility of
742 * holding up the transaction if the data copy hangs
743 * up on a pagefault (e.g., from an NFS server mapping).
747 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
749 ASSERT(abuf
!= NULL
);
750 ASSERT(arc_buf_size(abuf
) == max_blksz
);
751 if ((error
= uiocopy(abuf
->b_data
, max_blksz
,
752 UIO_WRITE
, uio
, &cbytes
))) {
753 dmu_return_arcbuf(abuf
);
756 ASSERT(cbytes
== max_blksz
);
760 * Start a transaction.
762 tx
= dmu_tx_create(zsb
->z_os
);
763 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
764 dmu_tx_hold_write(tx
, zp
->z_id
, woff
, MIN(n
, max_blksz
));
765 zfs_sa_upgrade_txholds(tx
, zp
);
766 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
768 if (error
== ERESTART
) {
775 dmu_return_arcbuf(abuf
);
780 * If zfs_range_lock() over-locked we grow the blocksize
781 * and then reduce the lock range. This will only happen
782 * on the first iteration since zfs_range_reduce() will
783 * shrink down r_len to the appropriate size.
785 if (rl
->r_len
== UINT64_MAX
) {
788 if (zp
->z_blksz
> max_blksz
) {
789 ASSERT(!ISP2(zp
->z_blksz
));
790 new_blksz
= MIN(end_size
, SPA_MAXBLOCKSIZE
);
792 new_blksz
= MIN(end_size
, max_blksz
);
794 zfs_grow_blocksize(zp
, new_blksz
, tx
);
795 zfs_range_reduce(rl
, woff
, n
);
799 * XXX - should we really limit each write to z_max_blksz?
800 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
802 nbytes
= MIN(n
, max_blksz
- P2PHASE(woff
, max_blksz
));
805 tx_bytes
= uio
->uio_resid
;
806 error
= dmu_write_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
808 tx_bytes
-= uio
->uio_resid
;
811 ASSERT(xuio
== NULL
|| tx_bytes
== aiov
->iov_len
);
813 * If this is not a full block write, but we are
814 * extending the file past EOF and this data starts
815 * block-aligned, use assign_arcbuf(). Otherwise,
816 * write via dmu_write().
818 if (tx_bytes
< max_blksz
&& (!write_eof
||
819 aiov
->iov_base
!= abuf
->b_data
)) {
821 dmu_write(zsb
->z_os
, zp
->z_id
, woff
,
822 aiov
->iov_len
, aiov
->iov_base
, tx
);
823 dmu_return_arcbuf(abuf
);
824 xuio_stat_wbuf_copied();
826 ASSERT(xuio
|| tx_bytes
== max_blksz
);
827 dmu_assign_arcbuf(sa_get_db(zp
->z_sa_hdl
),
830 ASSERT(tx_bytes
<= uio
->uio_resid
);
831 uioskip(uio
, tx_bytes
);
834 if (tx_bytes
&& zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
835 update_pages(ip
, woff
, tx_bytes
, zsb
->z_os
, zp
->z_id
);
838 * If we made no progress, we're done. If we made even
839 * partial progress, update the znode and ZIL accordingly.
842 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
843 (void *)&zp
->z_size
, sizeof (uint64_t), tx
);
850 * Clear Set-UID/Set-GID bits on successful write if not
851 * privileged and at least one of the excute bits is set.
853 * It would be nice to to this after all writes have
854 * been done, but that would still expose the ISUID/ISGID
855 * to another app after the partial write is committed.
857 * Note: we don't call zfs_fuid_map_id() here because
858 * user 0 is not an ephemeral uid.
860 mutex_enter(&zp
->z_acl_lock
);
861 if ((zp
->z_mode
& (S_IXUSR
| (S_IXUSR
>> 3) |
862 (S_IXUSR
>> 6))) != 0 &&
863 (zp
->z_mode
& (S_ISUID
| S_ISGID
)) != 0 &&
864 secpolicy_vnode_setid_retain(cr
,
865 (zp
->z_mode
& S_ISUID
) != 0 && zp
->z_uid
== 0) != 0) {
867 zp
->z_mode
&= ~(S_ISUID
| S_ISGID
);
868 newmode
= zp
->z_mode
;
869 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_MODE(zsb
),
870 (void *)&newmode
, sizeof (uint64_t), tx
);
872 mutex_exit(&zp
->z_acl_lock
);
874 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
878 * Update the file size (zp_size) if it has changed;
879 * account for possible concurrent updates.
881 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
882 (void) atomic_cas_64(&zp
->z_size
, end_size
,
887 * If we are replaying and eof is non zero then force
888 * the file size to the specified eof. Note, there's no
889 * concurrency during replay.
891 if (zsb
->z_replay
&& zsb
->z_replay_eof
!= 0)
892 zp
->z_size
= zsb
->z_replay_eof
;
894 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
896 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
);
901 ASSERT(tx_bytes
== nbytes
);
905 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
908 zfs_range_unlock(rl
);
911 * If we're in replay mode, or we made no progress, return error.
912 * Otherwise, it's at least a partial write, so it's successful.
914 if (zsb
->z_replay
|| uio
->uio_resid
== start_resid
) {
919 if (ioflag
& (FSYNC
| FDSYNC
) ||
920 zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
921 zil_commit(zilog
, zp
->z_id
);
923 zfs_inode_update(zp
);
927 EXPORT_SYMBOL(zfs_write
);
930 iput_async(struct inode
*ip
, taskq_t
*taskq
)
932 ASSERT(atomic_read(&ip
->i_count
) > 0);
933 if (atomic_read(&ip
->i_count
) == 1)
934 taskq_dispatch(taskq
, (task_func_t
*)iput
, ip
, TQ_PUSHPAGE
);
940 zfs_get_done(zgd_t
*zgd
, int error
)
942 znode_t
*zp
= zgd
->zgd_private
;
943 objset_t
*os
= ZTOZSB(zp
)->z_os
;
946 dmu_buf_rele(zgd
->zgd_db
, zgd
);
948 zfs_range_unlock(zgd
->zgd_rl
);
951 * Release the vnode asynchronously as we currently have the
952 * txg stopped from syncing.
954 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
956 if (error
== 0 && zgd
->zgd_bp
)
957 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
959 kmem_free(zgd
, sizeof (zgd_t
));
963 static int zil_fault_io
= 0;
967 * Get data to generate a TX_WRITE intent log record.
970 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
973 objset_t
*os
= zsb
->z_os
;
975 uint64_t object
= lr
->lr_foid
;
976 uint64_t offset
= lr
->lr_offset
;
977 uint64_t size
= lr
->lr_length
;
978 blkptr_t
*bp
= &lr
->lr_blkptr
;
987 * Nothing to do if the file has been removed
989 if (zfs_zget(zsb
, object
, &zp
) != 0)
991 if (zp
->z_unlinked
) {
993 * Release the vnode asynchronously as we currently have the
994 * txg stopped from syncing.
996 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
1000 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_PUSHPAGE
);
1001 zgd
->zgd_zilog
= zsb
->z_log
;
1002 zgd
->zgd_private
= zp
;
1005 * Write records come in two flavors: immediate and indirect.
1006 * For small writes it's cheaper to store the data with the
1007 * log record (immediate); for large writes it's cheaper to
1008 * sync the data and get a pointer to it (indirect) so that
1009 * we don't have to write the data twice.
1011 if (buf
!= NULL
) { /* immediate write */
1012 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
, RL_READER
);
1013 /* test for truncation needs to be done while range locked */
1014 if (offset
>= zp
->z_size
) {
1017 error
= dmu_read(os
, object
, offset
, size
, buf
,
1018 DMU_READ_NO_PREFETCH
);
1020 ASSERT(error
== 0 || error
== ENOENT
);
1021 } else { /* indirect write */
1023 * Have to lock the whole block to ensure when it's
1024 * written out and it's checksum is being calculated
1025 * that no one can change the data. We need to re-check
1026 * blocksize after we get the lock in case it's changed!
1031 blkoff
= ISP2(size
) ? P2PHASE(offset
, size
) : offset
;
1033 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
,
1035 if (zp
->z_blksz
== size
)
1038 zfs_range_unlock(zgd
->zgd_rl
);
1040 /* test for truncation needs to be done while range locked */
1041 if (lr
->lr_offset
>= zp
->z_size
)
1050 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
1051 DMU_READ_NO_PREFETCH
);
1057 ASSERT(db
->db_offset
== offset
);
1058 ASSERT(db
->db_size
== size
);
1060 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
1062 ASSERT(error
|| lr
->lr_length
<= zp
->z_blksz
);
1065 * On success, we need to wait for the write I/O
1066 * initiated by dmu_sync() to complete before we can
1067 * release this dbuf. We will finish everything up
1068 * in the zfs_get_done() callback.
1073 if (error
== EALREADY
) {
1074 lr
->lr_common
.lrc_txtype
= TX_WRITE2
;
1080 zfs_get_done(zgd
, error
);
1087 zfs_access(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
1089 znode_t
*zp
= ITOZ(ip
);
1090 zfs_sb_t
*zsb
= ITOZSB(ip
);
1096 if (flag
& V_ACE_MASK
)
1097 error
= zfs_zaccess(zp
, mode
, flag
, B_FALSE
, cr
);
1099 error
= zfs_zaccess_rwx(zp
, mode
, flag
, cr
);
1104 EXPORT_SYMBOL(zfs_access
);
1107 * Lookup an entry in a directory, or an extended attribute directory.
1108 * If it exists, return a held inode reference for it.
1110 * IN: dip - inode of directory to search.
1111 * nm - name of entry to lookup.
1112 * flags - LOOKUP_XATTR set if looking for an attribute.
1113 * cr - credentials of caller.
1114 * direntflags - directory lookup flags
1115 * realpnp - returned pathname.
1117 * OUT: ipp - inode of located entry, NULL if not found.
1119 * RETURN: 0 if success
1120 * error code if failure
1127 zfs_lookup(struct inode
*dip
, char *nm
, struct inode
**ipp
, int flags
,
1128 cred_t
*cr
, int *direntflags
, pathname_t
*realpnp
)
1130 znode_t
*zdp
= ITOZ(dip
);
1131 zfs_sb_t
*zsb
= ITOZSB(dip
);
1135 if (!(flags
& (LOOKUP_XATTR
| FIGNORECASE
))) {
1137 if (!S_ISDIR(dip
->i_mode
)) {
1139 } else if (zdp
->z_sa_hdl
== NULL
) {
1143 if (nm
[0] == 0 || (nm
[0] == '.' && nm
[1] == '\0')) {
1144 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1153 vnode_t
*tvp
= dnlc_lookup(dvp
, nm
);
1156 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1161 if (tvp
== DNLC_NO_VNODE
) {
1166 return (specvp_check(vpp
, cr
));
1169 #endif /* HAVE_DNLC */
1178 if (flags
& LOOKUP_XATTR
) {
1180 * We don't allow recursive attributes..
1181 * Maybe someday we will.
1183 if (zdp
->z_pflags
& ZFS_XATTR
) {
1188 if ((error
= zfs_get_xattrdir(zdp
, ipp
, cr
, flags
))) {
1194 * Do we have permission to get into attribute directory?
1197 if ((error
= zfs_zaccess(ITOZ(*ipp
), ACE_EXECUTE
, 0,
1207 if (!S_ISDIR(dip
->i_mode
)) {
1213 * Check accessibility of directory.
1216 if ((error
= zfs_zaccess(zdp
, ACE_EXECUTE
, 0, B_FALSE
, cr
))) {
1221 if (zsb
->z_utf8
&& u8_validate(nm
, strlen(nm
),
1222 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1227 error
= zfs_dirlook(zdp
, nm
, ipp
, flags
, direntflags
, realpnp
);
1228 if ((error
== 0) && (*ipp
))
1229 zfs_inode_update(ITOZ(*ipp
));
1234 EXPORT_SYMBOL(zfs_lookup
);
1237 * Attempt to create a new entry in a directory. If the entry
1238 * already exists, truncate the file if permissible, else return
1239 * an error. Return the ip of the created or trunc'd file.
1241 * IN: dip - inode of directory to put new file entry in.
1242 * name - name of new file entry.
1243 * vap - attributes of new file.
1244 * excl - flag indicating exclusive or non-exclusive mode.
1245 * mode - mode to open file with.
1246 * cr - credentials of caller.
1247 * flag - large file flag [UNUSED].
1248 * vsecp - ACL to be set
1250 * OUT: ipp - inode of created or trunc'd entry.
1252 * RETURN: 0 if success
1253 * error code if failure
1256 * dip - ctime|mtime updated if new entry created
1257 * ip - ctime|mtime always, atime if new
1262 zfs_create(struct inode
*dip
, char *name
, vattr_t
*vap
, int excl
,
1263 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1265 znode_t
*zp
, *dzp
= ITOZ(dip
);
1266 zfs_sb_t
*zsb
= ITOZSB(dip
);
1274 zfs_acl_ids_t acl_ids
;
1275 boolean_t fuid_dirtied
;
1276 boolean_t have_acl
= B_FALSE
;
1279 * If we have an ephemeral id, ACL, or XVATTR then
1280 * make sure file system is at proper version
1286 if (zsb
->z_use_fuids
== B_FALSE
&&
1287 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1295 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
1296 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1301 if (vap
->va_mask
& ATTR_XVATTR
) {
1302 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1303 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1311 if (*name
== '\0') {
1313 * Null component name refers to the directory itself.
1320 /* possible igrab(zp) */
1323 if (flag
& FIGNORECASE
)
1326 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1330 zfs_acl_ids_free(&acl_ids
);
1331 if (strcmp(name
, "..") == 0)
1342 * Create a new file object and update the directory
1345 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1347 zfs_acl_ids_free(&acl_ids
);
1352 * We only support the creation of regular files in
1353 * extended attribute directories.
1356 if ((dzp
->z_pflags
& ZFS_XATTR
) && !S_ISREG(vap
->va_mode
)) {
1358 zfs_acl_ids_free(&acl_ids
);
1363 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1364 cr
, vsecp
, &acl_ids
)) != 0)
1368 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1369 zfs_acl_ids_free(&acl_ids
);
1374 tx
= dmu_tx_create(os
);
1376 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1377 ZFS_SA_BASE_ATTR_SIZE
);
1379 fuid_dirtied
= zsb
->z_fuid_dirty
;
1381 zfs_fuid_txhold(zsb
, tx
);
1382 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
1383 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
1384 if (!zsb
->z_use_sa
&&
1385 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1386 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1387 0, acl_ids
.z_aclp
->z_acl_bytes
);
1389 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1391 zfs_dirent_unlock(dl
);
1392 if (error
== ERESTART
) {
1397 zfs_acl_ids_free(&acl_ids
);
1402 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1405 zfs_fuid_sync(zsb
, tx
);
1407 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1408 txtype
= zfs_log_create_txtype(Z_FILE
, vsecp
, vap
);
1409 if (flag
& FIGNORECASE
)
1411 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, name
,
1412 vsecp
, acl_ids
.z_fuidp
, vap
);
1413 zfs_acl_ids_free(&acl_ids
);
1416 int aflags
= (flag
& FAPPEND
) ? V_APPEND
: 0;
1419 zfs_acl_ids_free(&acl_ids
);
1423 * A directory entry already exists for this name.
1426 * Can't truncate an existing file if in exclusive mode.
1433 * Can't open a directory for writing.
1435 if (S_ISDIR(ZTOI(zp
)->i_mode
)) {
1440 * Verify requested access to file.
1442 if (mode
&& (error
= zfs_zaccess_rwx(zp
, mode
, aflags
, cr
))) {
1446 mutex_enter(&dzp
->z_lock
);
1448 mutex_exit(&dzp
->z_lock
);
1451 * Truncate regular files if requested.
1453 if (S_ISREG(ZTOI(zp
)->i_mode
) &&
1454 (vap
->va_mask
& ATTR_SIZE
) && (vap
->va_size
== 0)) {
1455 /* we can't hold any locks when calling zfs_freesp() */
1456 zfs_dirent_unlock(dl
);
1458 error
= zfs_freesp(zp
, 0, 0, mode
, TRUE
);
1464 zfs_dirent_unlock(dl
);
1470 zfs_inode_update(dzp
);
1471 zfs_inode_update(zp
);
1475 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1476 zil_commit(zilog
, 0);
1481 EXPORT_SYMBOL(zfs_create
);
1484 * Remove an entry from a directory.
1486 * IN: dip - inode of directory to remove entry from.
1487 * name - name of entry to remove.
1488 * cr - credentials of caller.
1490 * RETURN: 0 if success
1491 * error code if failure
1495 * ip - ctime (if nlink > 0)
1498 uint64_t null_xattr
= 0;
1502 zfs_remove(struct inode
*dip
, char *name
, cred_t
*cr
)
1504 znode_t
*zp
, *dzp
= ITOZ(dip
);
1507 zfs_sb_t
*zsb
= ITOZSB(dip
);
1510 uint64_t xattr_obj_unlinked
= 0;
1516 pathname_t
*realnmp
= NULL
;
1517 #ifdef HAVE_PN_UTILS
1519 #endif /* HAVE_PN_UTILS */
1527 #ifdef HAVE_PN_UTILS
1528 if (flags
& FIGNORECASE
) {
1533 #endif /* HAVE_PN_UTILS */
1539 * Attempt to lock directory; fail if entry doesn't exist.
1541 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1543 #ifdef HAVE_PN_UTILS
1546 #endif /* HAVE_PN_UTILS */
1553 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1558 * Need to use rmdir for removing directories.
1560 if (S_ISDIR(ip
->i_mode
)) {
1567 dnlc_remove(dvp
, realnmp
->pn_buf
);
1569 dnlc_remove(dvp
, name
);
1570 #endif /* HAVE_DNLC */
1573 * We never delete the znode and always place it in the unlinked
1574 * set. The dentry cache will always hold the last reference and
1575 * is responsible for safely freeing the znode.
1578 tx
= dmu_tx_create(zsb
->z_os
);
1579 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1580 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1581 zfs_sa_upgrade_txholds(tx
, zp
);
1582 zfs_sa_upgrade_txholds(tx
, dzp
);
1584 /* are there any extended attributes? */
1585 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1586 &xattr_obj
, sizeof (xattr_obj
));
1587 if (error
== 0 && xattr_obj
) {
1588 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
1590 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1591 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1594 /* charge as an update -- would be nice not to charge at all */
1595 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1597 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1599 zfs_dirent_unlock(dl
);
1603 if (error
== ERESTART
) {
1608 #ifdef HAVE_PN_UTILS
1611 #endif /* HAVE_PN_UTILS */
1618 * Remove the directory entry.
1620 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1629 * Hold z_lock so that we can make sure that the ACL obj
1630 * hasn't changed. Could have been deleted due to
1633 mutex_enter(&zp
->z_lock
);
1634 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1635 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1636 mutex_exit(&zp
->z_lock
);
1637 zfs_unlinked_add(zp
, tx
);
1641 #ifdef HAVE_PN_UTILS
1642 if (flags
& FIGNORECASE
)
1644 #endif /* HAVE_PN_UTILS */
1645 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1649 #ifdef HAVE_PN_UTILS
1652 #endif /* HAVE_PN_UTILS */
1654 zfs_dirent_unlock(dl
);
1655 zfs_inode_update(dzp
);
1656 zfs_inode_update(zp
);
1658 zfs_inode_update(xzp
);
1664 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1665 zil_commit(zilog
, 0);
1670 EXPORT_SYMBOL(zfs_remove
);
1673 * Create a new directory and insert it into dip using the name
1674 * provided. Return a pointer to the inserted directory.
1676 * IN: dip - inode of directory to add subdir to.
1677 * dirname - name of new directory.
1678 * vap - attributes of new directory.
1679 * cr - credentials of caller.
1680 * vsecp - ACL to be set
1682 * OUT: ipp - inode of created directory.
1684 * RETURN: 0 if success
1685 * error code if failure
1688 * dip - ctime|mtime updated
1689 * ipp - ctime|mtime|atime updated
1693 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1694 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1696 znode_t
*zp
, *dzp
= ITOZ(dip
);
1697 zfs_sb_t
*zsb
= ITOZSB(dip
);
1705 gid_t gid
= crgetgid(cr
);
1706 zfs_acl_ids_t acl_ids
;
1707 boolean_t fuid_dirtied
;
1709 ASSERT(S_ISDIR(vap
->va_mode
));
1712 * If we have an ephemeral id, ACL, or XVATTR then
1713 * make sure file system is at proper version
1717 if (zsb
->z_use_fuids
== B_FALSE
&&
1718 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1725 if (dzp
->z_pflags
& ZFS_XATTR
) {
1730 if (zsb
->z_utf8
&& u8_validate(dirname
,
1731 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1735 if (flags
& FIGNORECASE
)
1738 if (vap
->va_mask
& ATTR_XVATTR
) {
1739 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1740 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1746 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1747 vsecp
, &acl_ids
)) != 0) {
1752 * First make sure the new directory doesn't exist.
1754 * Existence is checked first to make sure we don't return
1755 * EACCES instead of EEXIST which can cause some applications
1761 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1763 zfs_acl_ids_free(&acl_ids
);
1768 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1769 zfs_acl_ids_free(&acl_ids
);
1770 zfs_dirent_unlock(dl
);
1775 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1776 zfs_acl_ids_free(&acl_ids
);
1777 zfs_dirent_unlock(dl
);
1783 * Add a new entry to the directory.
1785 tx
= dmu_tx_create(zsb
->z_os
);
1786 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
1787 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
1788 fuid_dirtied
= zsb
->z_fuid_dirty
;
1790 zfs_fuid_txhold(zsb
, tx
);
1791 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1792 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
1793 acl_ids
.z_aclp
->z_acl_bytes
);
1796 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1797 ZFS_SA_BASE_ATTR_SIZE
);
1799 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1801 zfs_dirent_unlock(dl
);
1802 if (error
== ERESTART
) {
1807 zfs_acl_ids_free(&acl_ids
);
1816 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1819 zfs_fuid_sync(zsb
, tx
);
1822 * Now put new name in parent dir.
1824 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1828 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
1829 if (flags
& FIGNORECASE
)
1831 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
1832 acl_ids
.z_fuidp
, vap
);
1834 zfs_acl_ids_free(&acl_ids
);
1838 zfs_dirent_unlock(dl
);
1840 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1841 zil_commit(zilog
, 0);
1843 zfs_inode_update(dzp
);
1844 zfs_inode_update(zp
);
1848 EXPORT_SYMBOL(zfs_mkdir
);
1851 * Remove a directory subdir entry. If the current working
1852 * directory is the same as the subdir to be removed, the
1855 * IN: dip - inode of directory to remove from.
1856 * name - name of directory to be removed.
1857 * cwd - inode of current working directory.
1858 * cr - credentials of caller.
1859 * flags - case flags
1861 * RETURN: 0 if success
1862 * error code if failure
1865 * dip - ctime|mtime updated
1869 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
1872 znode_t
*dzp
= ITOZ(dip
);
1875 zfs_sb_t
*zsb
= ITOZSB(dip
);
1886 if (flags
& FIGNORECASE
)
1892 * Attempt to lock directory; fail if entry doesn't exist.
1894 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1902 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1906 if (!S_ISDIR(ip
->i_mode
)) {
1917 * Grab a lock on the directory to make sure that noone is
1918 * trying to add (or lookup) entries while we are removing it.
1920 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
1923 * Grab a lock on the parent pointer to make sure we play well
1924 * with the treewalk and directory rename code.
1926 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
1928 tx
= dmu_tx_create(zsb
->z_os
);
1929 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1930 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1931 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1932 zfs_sa_upgrade_txholds(tx
, zp
);
1933 zfs_sa_upgrade_txholds(tx
, dzp
);
1934 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1936 rw_exit(&zp
->z_parent_lock
);
1937 rw_exit(&zp
->z_name_lock
);
1938 zfs_dirent_unlock(dl
);
1940 if (error
== ERESTART
) {
1950 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
1953 uint64_t txtype
= TX_RMDIR
;
1954 if (flags
& FIGNORECASE
)
1956 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
1961 rw_exit(&zp
->z_parent_lock
);
1962 rw_exit(&zp
->z_name_lock
);
1964 zfs_dirent_unlock(dl
);
1966 zfs_inode_update(dzp
);
1967 zfs_inode_update(zp
);
1970 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1971 zil_commit(zilog
, 0);
1976 EXPORT_SYMBOL(zfs_rmdir
);
1979 * Read as many directory entries as will fit into the provided
1980 * dirent buffer from the given directory cursor position.
1982 * IN: ip - inode of directory to read.
1983 * dirent - buffer for directory entries.
1985 * OUT: dirent - filler buffer of directory entries.
1987 * RETURN: 0 if success
1988 * error code if failure
1991 * ip - atime updated
1993 * Note that the low 4 bits of the cookie returned by zap is always zero.
1994 * This allows us to use the low range for "special" directory entries:
1995 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
1996 * we use the offset 2 for the '.zfs' directory.
2000 zfs_readdir(struct inode
*ip
, struct dir_context
*ctx
, cred_t
*cr
)
2002 znode_t
*zp
= ITOZ(ip
);
2003 zfs_sb_t
*zsb
= ITOZSB(ip
);
2006 zap_attribute_t zap
;
2012 uint64_t offset
; /* must be unsigned; checks for < 1 */
2017 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
2018 &parent
, sizeof (parent
))) != 0)
2022 * Quit if directory has been removed (posix)
2030 prefetch
= zp
->z_zn_prefetch
;
2033 * Initialize the iterator cursor.
2037 * Start iteration from the beginning of the directory.
2039 zap_cursor_init(&zc
, os
, zp
->z_id
);
2042 * The offset is a serialized cursor.
2044 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, offset
);
2048 * Transform to file-system independent format
2053 * Special case `.', `..', and `.zfs'.
2056 (void) strcpy(zap
.za_name
, ".");
2057 zap
.za_normalization_conflict
= 0;
2060 } else if (offset
== 1) {
2061 (void) strcpy(zap
.za_name
, "..");
2062 zap
.za_normalization_conflict
= 0;
2065 } else if (offset
== 2 && zfs_show_ctldir(zp
)) {
2066 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
2067 zap
.za_normalization_conflict
= 0;
2068 objnum
= ZFSCTL_INO_ROOT
;
2074 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
2075 if (error
== ENOENT
)
2082 * Allow multiple entries provided the first entry is
2083 * the object id. Non-zpl consumers may safely make
2084 * use of the additional space.
2086 * XXX: This should be a feature flag for compatibility
2088 if (zap
.za_integer_length
!= 8 ||
2089 zap
.za_num_integers
== 0) {
2090 cmn_err(CE_WARN
, "zap_readdir: bad directory "
2091 "entry, obj = %lld, offset = %lld, "
2092 "length = %d, num = %lld\n",
2093 (u_longlong_t
)zp
->z_id
,
2094 (u_longlong_t
)offset
,
2095 zap
.za_integer_length
,
2096 (u_longlong_t
)zap
.za_num_integers
);
2101 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
2102 type
= ZFS_DIRENT_TYPE(zap
.za_first_integer
);
2105 done
= !dir_emit(ctx
, zap
.za_name
, strlen(zap
.za_name
),
2110 /* Prefetch znode */
2112 dmu_prefetch(os
, objnum
, 0, 0);
2116 * Move to the next entry, fill in the previous offset.
2118 if (offset
> 2 || (offset
== 2 && !zfs_show_ctldir(zp
))) {
2119 zap_cursor_advance(&zc
);
2120 offset
= zap_cursor_serialize(&zc
);
2126 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
2129 zap_cursor_fini(&zc
);
2130 if (error
== ENOENT
)
2133 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
2134 zfs_inode_update(zp
);
2141 EXPORT_SYMBOL(zfs_readdir
);
2143 ulong_t zfs_fsync_sync_cnt
= 4;
2146 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2148 znode_t
*zp
= ITOZ(ip
);
2149 zfs_sb_t
*zsb
= ITOZSB(ip
);
2151 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2153 if (zsb
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2156 zil_commit(zsb
->z_log
, zp
->z_id
);
2161 EXPORT_SYMBOL(zfs_fsync
);
2165 * Get the requested file attributes and place them in the provided
2168 * IN: ip - inode of file.
2169 * vap - va_mask identifies requested attributes.
2170 * If ATTR_XVATTR set, then optional attrs are requested
2171 * flags - ATTR_NOACLCHECK (CIFS server context)
2172 * cr - credentials of caller.
2174 * OUT: vap - attribute values.
2176 * RETURN: 0 (always succeeds)
2180 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2182 znode_t
*zp
= ITOZ(ip
);
2183 zfs_sb_t
*zsb
= ITOZSB(ip
);
2186 uint64_t mtime
[2], ctime
[2];
2187 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2188 xoptattr_t
*xoap
= NULL
;
2189 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2190 sa_bulk_attr_t bulk
[2];
2196 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2198 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
2199 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
2201 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2207 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2208 * Also, if we are the owner don't bother, since owner should
2209 * always be allowed to read basic attributes of file.
2211 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2212 (vap
->va_uid
!= crgetuid(cr
))) {
2213 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2221 * Return all attributes. It's cheaper to provide the answer
2222 * than to determine whether we were asked the question.
2225 mutex_enter(&zp
->z_lock
);
2226 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2227 vap
->va_mode
= zp
->z_mode
;
2228 vap
->va_fsid
= ZTOI(zp
)->i_sb
->s_dev
;
2229 vap
->va_nodeid
= zp
->z_id
;
2230 if ((zp
->z_id
== zsb
->z_root
) && zfs_show_ctldir(zp
))
2231 links
= zp
->z_links
+ 1;
2233 links
= zp
->z_links
;
2234 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2235 vap
->va_size
= i_size_read(ip
);
2236 vap
->va_rdev
= ip
->i_rdev
;
2237 vap
->va_seq
= ip
->i_generation
;
2240 * Add in any requested optional attributes and the create time.
2241 * Also set the corresponding bits in the returned attribute bitmap.
2243 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zsb
->z_use_fuids
) {
2244 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2246 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2247 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2250 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2251 xoap
->xoa_readonly
=
2252 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2253 XVA_SET_RTN(xvap
, XAT_READONLY
);
2256 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2258 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2259 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2262 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2264 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2265 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2268 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2269 xoap
->xoa_nounlink
=
2270 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2271 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2274 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2275 xoap
->xoa_immutable
=
2276 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2277 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2280 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2281 xoap
->xoa_appendonly
=
2282 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2283 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2286 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2288 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2289 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2292 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2294 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2295 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2298 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2299 xoap
->xoa_av_quarantined
=
2300 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2301 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2304 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2305 xoap
->xoa_av_modified
=
2306 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2307 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2310 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2311 S_ISREG(ip
->i_mode
)) {
2312 zfs_sa_get_scanstamp(zp
, xvap
);
2315 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2318 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zsb
),
2319 times
, sizeof (times
));
2320 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2321 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2324 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2325 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2326 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2328 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2329 xoap
->xoa_generation
= zp
->z_gen
;
2330 XVA_SET_RTN(xvap
, XAT_GEN
);
2333 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2335 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2336 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2339 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2341 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2342 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2346 ZFS_TIME_DECODE(&vap
->va_atime
, zp
->z_atime
);
2347 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2348 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2350 mutex_exit(&zp
->z_lock
);
2352 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2354 if (zp
->z_blksz
== 0) {
2356 * Block size hasn't been set; suggest maximal I/O transfers.
2358 vap
->va_blksize
= zsb
->z_max_blksz
;
2364 EXPORT_SYMBOL(zfs_getattr
);
2367 * Get the basic file attributes and place them in the provided kstat
2368 * structure. The inode is assumed to be the authoritative source
2369 * for most of the attributes. However, the znode currently has the
2370 * authoritative atime, blksize, and block count.
2372 * IN: ip - inode of file.
2374 * OUT: sp - kstat values.
2376 * RETURN: 0 (always succeeds)
2380 zfs_getattr_fast(struct inode
*ip
, struct kstat
*sp
)
2382 znode_t
*zp
= ITOZ(ip
);
2383 zfs_sb_t
*zsb
= ITOZSB(ip
);
2388 mutex_enter(&zp
->z_lock
);
2390 generic_fillattr(ip
, sp
);
2391 ZFS_TIME_DECODE(&sp
->atime
, zp
->z_atime
);
2393 sa_object_size(zp
->z_sa_hdl
, (uint32_t *)&sp
->blksize
, &sp
->blocks
);
2394 if (unlikely(zp
->z_blksz
== 0)) {
2396 * Block size hasn't been set; suggest maximal I/O transfers.
2398 sp
->blksize
= zsb
->z_max_blksz
;
2401 mutex_exit(&zp
->z_lock
);
2407 EXPORT_SYMBOL(zfs_getattr_fast
);
2410 * Set the file attributes to the values contained in the
2413 * IN: ip - inode of file to be modified.
2414 * vap - new attribute values.
2415 * If ATTR_XVATTR set, then optional attrs are being set
2416 * flags - ATTR_UTIME set if non-default time values provided.
2417 * - ATTR_NOACLCHECK (CIFS context only).
2418 * cr - credentials of caller.
2420 * RETURN: 0 if success
2421 * error code if failure
2424 * ip - ctime updated, mtime updated if size changed.
2428 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2430 znode_t
*zp
= ITOZ(ip
);
2431 zfs_sb_t
*zsb
= ITOZSB(ip
);
2435 xvattr_t
*tmpxvattr
;
2436 uint_t mask
= vap
->va_mask
;
2437 uint_t saved_mask
= 0;
2440 uint64_t new_uid
, new_gid
;
2442 uint64_t mtime
[2], ctime
[2];
2444 int need_policy
= FALSE
;
2446 zfs_fuid_info_t
*fuidp
= NULL
;
2447 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2450 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2451 boolean_t fuid_dirtied
= B_FALSE
;
2452 sa_bulk_attr_t
*bulk
, *xattr_bulk
;
2453 int count
= 0, xattr_count
= 0;
2464 * Make sure that if we have ephemeral uid/gid or xvattr specified
2465 * that file system is at proper version level
2468 if (zsb
->z_use_fuids
== B_FALSE
&&
2469 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2470 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2471 (mask
& ATTR_XVATTR
))) {
2476 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2481 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2487 * If this is an xvattr_t, then get a pointer to the structure of
2488 * optional attributes. If this is NULL, then we have a vattr_t.
2490 xoap
= xva_getxoptattr(xvap
);
2492 tmpxvattr
= kmem_alloc(sizeof(xvattr_t
), KM_SLEEP
);
2493 xva_init(tmpxvattr
);
2495 bulk
= kmem_alloc(sizeof(sa_bulk_attr_t
) * 7, KM_SLEEP
);
2496 xattr_bulk
= kmem_alloc(sizeof(sa_bulk_attr_t
) * 7, KM_SLEEP
);
2499 * Immutable files can only alter immutable bit and atime
2501 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2502 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2503 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2508 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2514 * Verify timestamps doesn't overflow 32 bits.
2515 * ZFS can handle large timestamps, but 32bit syscalls can't
2516 * handle times greater than 2039. This check should be removed
2517 * once large timestamps are fully supported.
2519 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2520 if (((mask
& ATTR_ATIME
) && TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2521 ((mask
& ATTR_MTIME
) && TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2531 /* Can this be moved to before the top label? */
2532 if (zfs_is_readonly(zsb
)) {
2538 * First validate permissions
2541 if (mask
& ATTR_SIZE
) {
2542 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2546 truncate_setsize(ip
, vap
->va_size
);
2549 * XXX - Note, we are not providing any open
2550 * mode flags here (like FNDELAY), so we may
2551 * block if there are locks present... this
2552 * should be addressed in openat().
2554 /* XXX - would it be OK to generate a log record here? */
2555 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2560 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2561 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2562 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2563 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2564 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2565 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2566 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2567 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2568 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2572 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2573 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2578 * NOTE: even if a new mode is being set,
2579 * we may clear S_ISUID/S_ISGID bits.
2582 if (!(mask
& ATTR_MODE
))
2583 vap
->va_mode
= zp
->z_mode
;
2586 * Take ownership or chgrp to group we are a member of
2589 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2590 take_group
= (mask
& ATTR_GID
) &&
2591 zfs_groupmember(zsb
, vap
->va_gid
, cr
);
2594 * If both ATTR_UID and ATTR_GID are set then take_owner and
2595 * take_group must both be set in order to allow taking
2598 * Otherwise, send the check through secpolicy_vnode_setattr()
2602 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2603 take_owner
&& take_group
) ||
2604 ((idmask
== ATTR_UID
) && take_owner
) ||
2605 ((idmask
== ATTR_GID
) && take_group
)) {
2606 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2607 skipaclchk
, cr
) == 0) {
2609 * Remove setuid/setgid for non-privileged users
2611 (void) secpolicy_setid_clear(vap
, cr
);
2612 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2621 mutex_enter(&zp
->z_lock
);
2622 oldva
.va_mode
= zp
->z_mode
;
2623 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2624 if (mask
& ATTR_XVATTR
) {
2626 * Update xvattr mask to include only those attributes
2627 * that are actually changing.
2629 * the bits will be restored prior to actually setting
2630 * the attributes so the caller thinks they were set.
2632 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2633 if (xoap
->xoa_appendonly
!=
2634 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2637 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2638 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2642 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2643 if (xoap
->xoa_nounlink
!=
2644 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2647 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2648 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2652 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2653 if (xoap
->xoa_immutable
!=
2654 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2657 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2658 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2662 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2663 if (xoap
->xoa_nodump
!=
2664 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2667 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2668 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2672 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2673 if (xoap
->xoa_av_modified
!=
2674 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2677 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2678 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2682 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2683 if ((!S_ISREG(ip
->i_mode
) &&
2684 xoap
->xoa_av_quarantined
) ||
2685 xoap
->xoa_av_quarantined
!=
2686 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2689 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2690 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2694 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2695 mutex_exit(&zp
->z_lock
);
2700 if (need_policy
== FALSE
&&
2701 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2702 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2707 mutex_exit(&zp
->z_lock
);
2709 if (mask
& ATTR_MODE
) {
2710 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2711 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2716 trim_mask
|= ATTR_MODE
;
2724 * If trim_mask is set then take ownership
2725 * has been granted or write_acl is present and user
2726 * has the ability to modify mode. In that case remove
2727 * UID|GID and or MODE from mask so that
2728 * secpolicy_vnode_setattr() doesn't revoke it.
2732 saved_mask
= vap
->va_mask
;
2733 vap
->va_mask
&= ~trim_mask
;
2735 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2736 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2741 vap
->va_mask
|= saved_mask
;
2745 * secpolicy_vnode_setattr, or take ownership may have
2748 mask
= vap
->va_mask
;
2750 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2751 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
2752 &xattr_obj
, sizeof (xattr_obj
));
2754 if (err
== 0 && xattr_obj
) {
2755 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
2759 if (mask
& ATTR_UID
) {
2760 new_uid
= zfs_fuid_create(zsb
,
2761 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
2762 if (new_uid
!= zp
->z_uid
&&
2763 zfs_fuid_overquota(zsb
, B_FALSE
, new_uid
)) {
2771 if (mask
& ATTR_GID
) {
2772 new_gid
= zfs_fuid_create(zsb
, (uint64_t)vap
->va_gid
,
2773 cr
, ZFS_GROUP
, &fuidp
);
2774 if (new_gid
!= zp
->z_gid
&&
2775 zfs_fuid_overquota(zsb
, B_TRUE
, new_gid
)) {
2783 tx
= dmu_tx_create(zsb
->z_os
);
2785 if (mask
& ATTR_MODE
) {
2786 uint64_t pmode
= zp
->z_mode
;
2788 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
2790 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
2792 mutex_enter(&zp
->z_lock
);
2793 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
2795 * Are we upgrading ACL from old V0 format
2798 if (zsb
->z_version
>= ZPL_VERSION_FUID
&&
2799 zfs_znode_acl_version(zp
) ==
2800 ZFS_ACL_VERSION_INITIAL
) {
2801 dmu_tx_hold_free(tx
, acl_obj
, 0,
2803 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2804 0, aclp
->z_acl_bytes
);
2806 dmu_tx_hold_write(tx
, acl_obj
, 0,
2809 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
2810 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2811 0, aclp
->z_acl_bytes
);
2813 mutex_exit(&zp
->z_lock
);
2814 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2816 if ((mask
& ATTR_XVATTR
) &&
2817 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2818 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2820 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2824 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
2827 fuid_dirtied
= zsb
->z_fuid_dirty
;
2829 zfs_fuid_txhold(zsb
, tx
);
2831 zfs_sa_upgrade_txholds(tx
, zp
);
2833 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
2835 if (err
== ERESTART
)
2842 * Set each attribute requested.
2843 * We group settings according to the locks they need to acquire.
2845 * Note: you cannot set ctime directly, although it will be
2846 * updated as a side-effect of calling this function.
2850 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2851 mutex_enter(&zp
->z_acl_lock
);
2852 mutex_enter(&zp
->z_lock
);
2854 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
2855 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
2858 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2859 mutex_enter(&attrzp
->z_acl_lock
);
2860 mutex_enter(&attrzp
->z_lock
);
2861 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2862 SA_ZPL_FLAGS(zsb
), NULL
, &attrzp
->z_pflags
,
2863 sizeof (attrzp
->z_pflags
));
2866 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2868 if (mask
& ATTR_UID
) {
2869 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zsb
), NULL
,
2870 &new_uid
, sizeof (new_uid
));
2871 zp
->z_uid
= new_uid
;
2873 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2874 SA_ZPL_UID(zsb
), NULL
, &new_uid
,
2876 attrzp
->z_uid
= new_uid
;
2880 if (mask
& ATTR_GID
) {
2881 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zsb
),
2882 NULL
, &new_gid
, sizeof (new_gid
));
2883 zp
->z_gid
= new_gid
;
2885 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2886 SA_ZPL_GID(zsb
), NULL
, &new_gid
,
2888 attrzp
->z_gid
= new_gid
;
2891 if (!(mask
& ATTR_MODE
)) {
2892 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
),
2893 NULL
, &new_mode
, sizeof (new_mode
));
2894 new_mode
= zp
->z_mode
;
2896 err
= zfs_acl_chown_setattr(zp
);
2899 err
= zfs_acl_chown_setattr(attrzp
);
2904 if (mask
& ATTR_MODE
) {
2905 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
), NULL
,
2906 &new_mode
, sizeof (new_mode
));
2907 zp
->z_mode
= new_mode
;
2908 ASSERT3P(aclp
, !=, NULL
);
2909 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
2911 if (zp
->z_acl_cached
)
2912 zfs_acl_free(zp
->z_acl_cached
);
2913 zp
->z_acl_cached
= aclp
;
2918 if (mask
& ATTR_ATIME
) {
2919 ZFS_TIME_ENCODE(&vap
->va_atime
, zp
->z_atime
);
2920 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
,
2921 &zp
->z_atime
, sizeof (zp
->z_atime
));
2924 if (mask
& ATTR_MTIME
) {
2925 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
2926 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
2927 mtime
, sizeof (mtime
));
2930 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
2931 if (mask
& ATTR_SIZE
&& !(mask
& ATTR_MTIME
)) {
2932 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
2933 NULL
, mtime
, sizeof (mtime
));
2934 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2935 &ctime
, sizeof (ctime
));
2936 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
2938 } else if (mask
!= 0) {
2939 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2940 &ctime
, sizeof (ctime
));
2941 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
2944 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2945 SA_ZPL_CTIME(zsb
), NULL
,
2946 &ctime
, sizeof (ctime
));
2947 zfs_tstamp_update_setup(attrzp
, STATE_CHANGED
,
2948 mtime
, ctime
, B_TRUE
);
2952 * Do this after setting timestamps to prevent timestamp
2953 * update from toggling bit
2956 if (xoap
&& (mask
& ATTR_XVATTR
)) {
2959 * restore trimmed off masks
2960 * so that return masks can be set for caller.
2963 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
2964 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
2966 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
2967 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
2969 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
2970 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
2972 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
2973 XVA_SET_REQ(xvap
, XAT_NODUMP
);
2975 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
2976 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
2978 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
2979 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
2982 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2983 ASSERT(S_ISREG(ip
->i_mode
));
2985 zfs_xvattr_set(zp
, xvap
, tx
);
2989 zfs_fuid_sync(zsb
, tx
);
2992 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
2994 mutex_exit(&zp
->z_lock
);
2995 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2996 mutex_exit(&zp
->z_acl_lock
);
2999 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3000 mutex_exit(&attrzp
->z_acl_lock
);
3001 mutex_exit(&attrzp
->z_lock
);
3004 if (err
== 0 && attrzp
) {
3005 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
3016 zfs_fuid_info_free(fuidp
);
3022 if (err
== ERESTART
)
3025 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
3027 zfs_inode_update(zp
);
3031 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3032 zil_commit(zilog
, 0);
3035 kmem_free(xattr_bulk
, sizeof(sa_bulk_attr_t
) * 7);
3036 kmem_free(bulk
, sizeof(sa_bulk_attr_t
) * 7);
3037 kmem_free(tmpxvattr
, sizeof(xvattr_t
));
3041 EXPORT_SYMBOL(zfs_setattr
);
3043 typedef struct zfs_zlock
{
3044 krwlock_t
*zl_rwlock
; /* lock we acquired */
3045 znode_t
*zl_znode
; /* znode we held */
3046 struct zfs_zlock
*zl_next
; /* next in list */
3050 * Drop locks and release vnodes that were held by zfs_rename_lock().
3053 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
3057 while ((zl
= *zlpp
) != NULL
) {
3058 if (zl
->zl_znode
!= NULL
)
3059 iput(ZTOI(zl
->zl_znode
));
3060 rw_exit(zl
->zl_rwlock
);
3061 *zlpp
= zl
->zl_next
;
3062 kmem_free(zl
, sizeof (*zl
));
3067 * Search back through the directory tree, using the ".." entries.
3068 * Lock each directory in the chain to prevent concurrent renames.
3069 * Fail any attempt to move a directory into one of its own descendants.
3070 * XXX - z_parent_lock can overlap with map or grow locks
3073 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
3077 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
3078 uint64_t oidp
= zp
->z_id
;
3079 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
3080 krw_t rw
= RW_WRITER
;
3083 * First pass write-locks szp and compares to zp->z_id.
3084 * Later passes read-lock zp and compare to zp->z_parent.
3087 if (!rw_tryenter(rwlp
, rw
)) {
3089 * Another thread is renaming in this path.
3090 * Note that if we are a WRITER, we don't have any
3091 * parent_locks held yet.
3093 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
3095 * Drop our locks and restart
3097 zfs_rename_unlock(&zl
);
3101 rwlp
= &szp
->z_parent_lock
;
3106 * Wait for other thread to drop its locks
3112 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
3113 zl
->zl_rwlock
= rwlp
;
3114 zl
->zl_znode
= NULL
;
3115 zl
->zl_next
= *zlpp
;
3118 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
3121 if (oidp
== rootid
) /* We've hit the top */
3124 if (rw
== RW_READER
) { /* i.e. not the first pass */
3125 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
3130 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
3131 &oidp
, sizeof (oidp
));
3132 rwlp
= &zp
->z_parent_lock
;
3135 } while (zp
->z_id
!= sdzp
->z_id
);
3141 * Move an entry from the provided source directory to the target
3142 * directory. Change the entry name as indicated.
3144 * IN: sdip - Source directory containing the "old entry".
3145 * snm - Old entry name.
3146 * tdip - Target directory to contain the "new entry".
3147 * tnm - New entry name.
3148 * cr - credentials of caller.
3149 * flags - case flags
3151 * RETURN: 0 if success
3152 * error code if failure
3155 * sdip,tdip - ctime|mtime updated
3159 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
3160 cred_t
*cr
, int flags
)
3162 znode_t
*tdzp
, *szp
, *tzp
;
3163 znode_t
*sdzp
= ITOZ(sdip
);
3164 zfs_sb_t
*zsb
= ITOZSB(sdip
);
3166 zfs_dirlock_t
*sdl
, *tdl
;
3169 int cmp
, serr
, terr
;
3174 ZFS_VERIFY_ZP(sdzp
);
3177 if (tdip
->i_sb
!= sdip
->i_sb
) {
3183 ZFS_VERIFY_ZP(tdzp
);
3184 if (zsb
->z_utf8
&& u8_validate(tnm
,
3185 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3190 if (flags
& FIGNORECASE
)
3199 * This is to prevent the creation of links into attribute space
3200 * by renaming a linked file into/outof an attribute directory.
3201 * See the comment in zfs_link() for why this is considered bad.
3203 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3209 * Lock source and target directory entries. To prevent deadlock,
3210 * a lock ordering must be defined. We lock the directory with
3211 * the smallest object id first, or if it's a tie, the one with
3212 * the lexically first name.
3214 if (sdzp
->z_id
< tdzp
->z_id
) {
3216 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3220 * First compare the two name arguments without
3221 * considering any case folding.
3223 int nofold
= (zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3225 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3226 ASSERT(error
== 0 || !zsb
->z_utf8
);
3229 * POSIX: "If the old argument and the new argument
3230 * both refer to links to the same existing file,
3231 * the rename() function shall return successfully
3232 * and perform no other action."
3238 * If the file system is case-folding, then we may
3239 * have some more checking to do. A case-folding file
3240 * system is either supporting mixed case sensitivity
3241 * access or is completely case-insensitive. Note
3242 * that the file system is always case preserving.
3244 * In mixed sensitivity mode case sensitive behavior
3245 * is the default. FIGNORECASE must be used to
3246 * explicitly request case insensitive behavior.
3248 * If the source and target names provided differ only
3249 * by case (e.g., a request to rename 'tim' to 'Tim'),
3250 * we will treat this as a special case in the
3251 * case-insensitive mode: as long as the source name
3252 * is an exact match, we will allow this to proceed as
3253 * a name-change request.
3255 if ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
||
3256 (zsb
->z_case
== ZFS_CASE_MIXED
&&
3257 flags
& FIGNORECASE
)) &&
3258 u8_strcmp(snm
, tnm
, 0, zsb
->z_norm
, U8_UNICODE_LATEST
,
3261 * case preserving rename request, require exact
3270 * If the source and destination directories are the same, we should
3271 * grab the z_name_lock of that directory only once.
3275 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3279 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3280 ZEXISTS
| zflg
, NULL
, NULL
);
3281 terr
= zfs_dirent_lock(&tdl
,
3282 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3284 terr
= zfs_dirent_lock(&tdl
,
3285 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3286 serr
= zfs_dirent_lock(&sdl
,
3287 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3293 * Source entry invalid or not there.
3296 zfs_dirent_unlock(tdl
);
3302 rw_exit(&sdzp
->z_name_lock
);
3304 if (strcmp(snm
, "..") == 0)
3310 zfs_dirent_unlock(sdl
);
3314 rw_exit(&sdzp
->z_name_lock
);
3316 if (strcmp(tnm
, "..") == 0)
3323 * Must have write access at the source to remove the old entry
3324 * and write access at the target to create the new entry.
3325 * Note that if target and source are the same, this can be
3326 * done in a single check.
3329 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3332 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3334 * Check to make sure rename is valid.
3335 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3337 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3342 * Does target exist?
3346 * Source and target must be the same type.
3348 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3349 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3354 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3360 * POSIX dictates that when the source and target
3361 * entries refer to the same file object, rename
3362 * must do nothing and exit without error.
3364 if (szp
->z_id
== tzp
->z_id
) {
3370 tx
= dmu_tx_create(zsb
->z_os
);
3371 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3372 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3373 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3374 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3376 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3377 zfs_sa_upgrade_txholds(tx
, tdzp
);
3380 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3381 zfs_sa_upgrade_txholds(tx
, tzp
);
3384 zfs_sa_upgrade_txholds(tx
, szp
);
3385 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
3386 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3389 zfs_rename_unlock(&zl
);
3390 zfs_dirent_unlock(sdl
);
3391 zfs_dirent_unlock(tdl
);
3394 rw_exit(&sdzp
->z_name_lock
);
3399 if (error
== ERESTART
) {
3409 if (tzp
) /* Attempt to remove the existing target */
3410 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3413 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3415 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3417 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zsb
),
3418 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3421 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3423 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3424 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3425 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3428 * At this point, we have successfully created
3429 * the target name, but have failed to remove
3430 * the source name. Since the create was done
3431 * with the ZRENAMING flag, there are
3432 * complications; for one, the link count is
3433 * wrong. The easiest way to deal with this
3434 * is to remove the newly created target, and
3435 * return the original error. This must
3436 * succeed; fortunately, it is very unlikely to
3437 * fail, since we just created it.
3439 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3440 ZRENAMING
, NULL
), ==, 0);
3448 zfs_rename_unlock(&zl
);
3450 zfs_dirent_unlock(sdl
);
3451 zfs_dirent_unlock(tdl
);
3453 zfs_inode_update(sdzp
);
3455 rw_exit(&sdzp
->z_name_lock
);
3458 zfs_inode_update(tdzp
);
3460 zfs_inode_update(szp
);
3463 zfs_inode_update(tzp
);
3467 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3468 zil_commit(zilog
, 0);
3473 EXPORT_SYMBOL(zfs_rename
);
3476 * Insert the indicated symbolic reference entry into the directory.
3478 * IN: dip - Directory to contain new symbolic link.
3479 * link - Name for new symlink entry.
3480 * vap - Attributes of new entry.
3481 * target - Target path of new symlink.
3483 * cr - credentials of caller.
3484 * flags - case flags
3486 * RETURN: 0 if success
3487 * error code if failure
3490 * dip - ctime|mtime updated
3494 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3495 struct inode
**ipp
, cred_t
*cr
, int flags
)
3497 znode_t
*zp
, *dzp
= ITOZ(dip
);
3500 zfs_sb_t
*zsb
= ITOZSB(dip
);
3502 uint64_t len
= strlen(link
);
3505 zfs_acl_ids_t acl_ids
;
3506 boolean_t fuid_dirtied
;
3507 uint64_t txtype
= TX_SYMLINK
;
3509 ASSERT(S_ISLNK(vap
->va_mode
));
3515 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
3516 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3520 if (flags
& FIGNORECASE
)
3523 if (len
> MAXPATHLEN
) {
3525 return (ENAMETOOLONG
);
3528 if ((error
= zfs_acl_ids_create(dzp
, 0,
3529 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3537 * Attempt to lock directory; fail if entry already exists.
3539 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3541 zfs_acl_ids_free(&acl_ids
);
3546 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3547 zfs_acl_ids_free(&acl_ids
);
3548 zfs_dirent_unlock(dl
);
3553 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
3554 zfs_acl_ids_free(&acl_ids
);
3555 zfs_dirent_unlock(dl
);
3559 tx
= dmu_tx_create(zsb
->z_os
);
3560 fuid_dirtied
= zsb
->z_fuid_dirty
;
3561 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3562 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3563 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3564 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3565 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3566 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3567 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3568 acl_ids
.z_aclp
->z_acl_bytes
);
3571 zfs_fuid_txhold(zsb
, tx
);
3572 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3574 zfs_dirent_unlock(dl
);
3575 if (error
== ERESTART
) {
3580 zfs_acl_ids_free(&acl_ids
);
3587 * Create a new object for the symlink.
3588 * for version 4 ZPL datsets the symlink will be an SA attribute
3590 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3593 zfs_fuid_sync(zsb
, tx
);
3595 mutex_enter(&zp
->z_lock
);
3597 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zsb
),
3600 zfs_sa_symlink(zp
, link
, len
, tx
);
3601 mutex_exit(&zp
->z_lock
);
3604 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
3605 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3607 * Insert the new object into the directory.
3609 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3611 if (flags
& FIGNORECASE
)
3613 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3615 zfs_inode_update(dzp
);
3616 zfs_inode_update(zp
);
3618 zfs_acl_ids_free(&acl_ids
);
3622 zfs_dirent_unlock(dl
);
3626 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3627 zil_commit(zilog
, 0);
3632 EXPORT_SYMBOL(zfs_symlink
);
3635 * Return, in the buffer contained in the provided uio structure,
3636 * the symbolic path referred to by ip.
3638 * IN: ip - inode of symbolic link
3639 * uio - structure to contain the link path.
3640 * cr - credentials of caller.
3642 * RETURN: 0 if success
3643 * error code if failure
3646 * ip - atime updated
3650 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3652 znode_t
*zp
= ITOZ(ip
);
3653 zfs_sb_t
*zsb
= ITOZSB(ip
);
3659 mutex_enter(&zp
->z_lock
);
3661 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3662 SA_ZPL_SYMLINK(zsb
), uio
);
3664 error
= zfs_sa_readlink(zp
, uio
);
3665 mutex_exit(&zp
->z_lock
);
3667 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
3668 zfs_inode_update(zp
);
3672 EXPORT_SYMBOL(zfs_readlink
);
3675 * Insert a new entry into directory tdip referencing sip.
3677 * IN: tdip - Directory to contain new entry.
3678 * sip - inode of new entry.
3679 * name - name of new entry.
3680 * cr - credentials of caller.
3682 * RETURN: 0 if success
3683 * error code if failure
3686 * tdip - ctime|mtime updated
3687 * sip - ctime updated
3691 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
)
3693 znode_t
*dzp
= ITOZ(tdip
);
3695 zfs_sb_t
*zsb
= ITOZSB(tdip
);
3704 ASSERT(S_ISDIR(tdip
->i_mode
));
3711 * POSIX dictates that we return EPERM here.
3712 * Better choices include ENOTSUP or EISDIR.
3714 if (S_ISDIR(sip
->i_mode
)) {
3719 if (sip
->i_sb
!= tdip
->i_sb
) {
3727 /* Prevent links to .zfs/shares files */
3729 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
3730 &parent
, sizeof (uint64_t))) != 0) {
3734 if (parent
== zsb
->z_shares_dir
) {
3739 if (zsb
->z_utf8
&& u8_validate(name
,
3740 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3744 #ifdef HAVE_PN_UTILS
3745 if (flags
& FIGNORECASE
)
3747 #endif /* HAVE_PN_UTILS */
3750 * We do not support links between attributes and non-attributes
3751 * because of the potential security risk of creating links
3752 * into "normal" file space in order to circumvent restrictions
3753 * imposed in attribute space.
3755 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
3760 owner
= zfs_fuid_map_id(zsb
, szp
->z_uid
, cr
, ZFS_OWNER
);
3761 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
3766 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3773 * Attempt to lock directory; fail if entry already exists.
3775 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
3781 tx
= dmu_tx_create(zsb
->z_os
);
3782 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3783 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3784 zfs_sa_upgrade_txholds(tx
, szp
);
3785 zfs_sa_upgrade_txholds(tx
, dzp
);
3786 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3788 zfs_dirent_unlock(dl
);
3789 if (error
== ERESTART
) {
3799 error
= zfs_link_create(dl
, szp
, tx
, 0);
3802 uint64_t txtype
= TX_LINK
;
3803 #ifdef HAVE_PN_UTILS
3804 if (flags
& FIGNORECASE
)
3806 #endif /* HAVE_PN_UTILS */
3807 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
3812 zfs_dirent_unlock(dl
);
3814 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3815 zil_commit(zilog
, 0);
3817 zfs_inode_update(dzp
);
3818 zfs_inode_update(szp
);
3822 EXPORT_SYMBOL(zfs_link
);
3825 zfs_putpage_commit_cb(void *arg
, int error
)
3827 struct page
*pp
= arg
;
3830 __set_page_dirty_nobuffers(pp
);
3832 if (error
!= ECANCELED
)
3838 end_page_writeback(pp
);
3842 * Push a page out to disk, once the page is on stable storage the
3843 * registered commit callback will be run as notification of completion.
3845 * IN: ip - page mapped for inode.
3846 * pp - page to push (page is locked)
3847 * wbc - writeback control data
3849 * RETURN: 0 if success
3850 * error code if failure
3853 * ip - ctime|mtime updated
3857 zfs_putpage(struct inode
*ip
, struct page
*pp
, struct writeback_control
*wbc
)
3859 znode_t
*zp
= ITOZ(ip
);
3860 zfs_sb_t
*zsb
= ITOZSB(ip
);
3868 uint64_t mtime
[2], ctime
[2];
3869 sa_bulk_attr_t bulk
[3];
3876 ASSERT(PageLocked(pp
));
3878 pgoff
= page_offset(pp
); /* Page byte-offset in file */
3879 offset
= i_size_read(ip
); /* File length in bytes */
3880 pglen
= MIN(PAGE_CACHE_SIZE
, /* Page length in bytes */
3881 P2ROUNDUP(offset
, PAGE_CACHE_SIZE
)-pgoff
);
3883 /* Page is beyond end of file */
3884 if (pgoff
>= offset
) {
3890 /* Truncate page length to end of file */
3891 if (pgoff
+ pglen
> offset
)
3892 pglen
= offset
- pgoff
;
3896 * FIXME: Allow mmap writes past its quota. The correct fix
3897 * is to register a page_mkwrite() handler to count the page
3898 * against its quota when it is about to be dirtied.
3900 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
3901 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
3906 set_page_writeback(pp
);
3909 rl
= zfs_range_lock(zp
, pgoff
, pglen
, RL_WRITER
);
3910 tx
= dmu_tx_create(zsb
->z_os
);
3912 sync
= ((zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
) ||
3913 (wbc
->sync_mode
== WB_SYNC_ALL
));
3915 dmu_tx_callback_register(tx
, zfs_putpage_commit_cb
, pp
);
3917 dmu_tx_hold_write(tx
, zp
->z_id
, pgoff
, pglen
);
3919 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3920 zfs_sa_upgrade_txholds(tx
, zp
);
3921 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3923 if (err
== ERESTART
)
3926 /* Will call all registered commit callbacks */
3930 * For the synchronous case the commit callback must be
3931 * explicitly called because there is no registered callback.
3934 zfs_putpage_commit_cb(pp
, ECANCELED
);
3936 zfs_range_unlock(rl
);
3942 ASSERT3U(pglen
, <=, PAGE_CACHE_SIZE
);
3943 dmu_write(zsb
->z_os
, zp
->z_id
, pgoff
, pglen
, va
, tx
);
3946 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
3947 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
3948 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_FLAGS(zsb
), NULL
, &zp
->z_pflags
, 8);
3950 /* Preserve the mtime and ctime provided by the inode */
3951 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
3952 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
3953 zp
->z_atime_dirty
= 0;
3956 err
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
3958 zfs_log_write(zsb
->z_log
, tx
, TX_WRITE
, zp
, pgoff
, pglen
, 0);
3961 zfs_range_unlock(rl
);
3964 zil_commit(zsb
->z_log
, zp
->z_id
);
3965 zfs_putpage_commit_cb(pp
, err
);
3973 * Update the system attributes when the inode has been dirtied. For the
3974 * moment we only update the mode, atime, mtime, and ctime.
3977 zfs_dirty_inode(struct inode
*ip
, int flags
)
3979 znode_t
*zp
= ITOZ(ip
);
3980 zfs_sb_t
*zsb
= ITOZSB(ip
);
3982 uint64_t mode
, atime
[2], mtime
[2], ctime
[2];
3983 sa_bulk_attr_t bulk
[4];
3990 tx
= dmu_tx_create(zsb
->z_os
);
3992 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3993 zfs_sa_upgrade_txholds(tx
, zp
);
3995 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4001 mutex_enter(&zp
->z_lock
);
4002 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MODE(zsb
), NULL
, &mode
, 8);
4003 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_ATIME(zsb
), NULL
, &atime
, 16);
4004 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
4005 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
4007 /* Preserve the mode, mtime and ctime provided by the inode */
4008 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4009 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4010 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4014 zp
->z_atime_dirty
= 0;
4016 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4017 mutex_exit(&zp
->z_lock
);
4024 EXPORT_SYMBOL(zfs_dirty_inode
);
4028 zfs_inactive(struct inode
*ip
)
4030 znode_t
*zp
= ITOZ(ip
);
4031 zfs_sb_t
*zsb
= ITOZSB(ip
);
4034 if (zfsctl_is_node(ip
)) {
4035 zfsctl_inode_inactive(ip
);
4039 rw_enter(&zsb
->z_teardown_inactive_lock
, RW_READER
);
4040 if (zp
->z_sa_hdl
== NULL
) {
4041 rw_exit(&zsb
->z_teardown_inactive_lock
);
4045 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
4046 dmu_tx_t
*tx
= dmu_tx_create(zsb
->z_os
);
4048 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4049 zfs_sa_upgrade_txholds(tx
, zp
);
4050 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4054 mutex_enter(&zp
->z_lock
);
4055 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zsb
),
4056 (void *)&zp
->z_atime
, sizeof (zp
->z_atime
), tx
);
4057 zp
->z_atime_dirty
= 0;
4058 mutex_exit(&zp
->z_lock
);
4064 rw_exit(&zsb
->z_teardown_inactive_lock
);
4066 EXPORT_SYMBOL(zfs_inactive
);
4069 * Bounds-check the seek operation.
4071 * IN: ip - inode seeking within
4072 * ooff - old file offset
4073 * noffp - pointer to new file offset
4074 * ct - caller context
4076 * RETURN: 0 if success
4077 * EINVAL if new offset invalid
4081 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
4083 if (S_ISDIR(ip
->i_mode
))
4085 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
4087 EXPORT_SYMBOL(zfs_seek
);
4090 * Fill pages with data from the disk.
4093 zfs_fillpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4095 znode_t
*zp
= ITOZ(ip
);
4096 zfs_sb_t
*zsb
= ITOZSB(ip
);
4098 struct page
*cur_pp
;
4099 u_offset_t io_off
, total
;
4106 io_len
= nr_pages
<< PAGE_CACHE_SHIFT
;
4107 i_size
= i_size_read(ip
);
4108 io_off
= page_offset(pl
[0]);
4110 if (io_off
+ io_len
> i_size
)
4111 io_len
= i_size
- io_off
;
4114 * Iterate over list of pages and read each page individually.
4118 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
4122 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
4126 /* convert checksum errors into IO errors */
4131 cur_pp
= pl
[++page_idx
];
4138 * Uses zfs_fillpage to read data from the file and fill the pages.
4140 * IN: ip - inode of file to get data from.
4141 * pl - list of pages to read
4142 * nr_pages - number of pages to read
4144 * RETURN: 0 if success
4145 * error code if failure
4148 * vp - atime updated
4152 zfs_getpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4154 znode_t
*zp
= ITOZ(ip
);
4155 zfs_sb_t
*zsb
= ITOZSB(ip
);
4164 err
= zfs_fillpage(ip
, pl
, nr_pages
);
4167 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
4172 EXPORT_SYMBOL(zfs_getpage
);
4175 * Check ZFS specific permissions to memory map a section of a file.
4177 * IN: ip - inode of the file to mmap
4179 * addrp - start address in memory region
4180 * len - length of memory region
4181 * vm_flags- address flags
4183 * RETURN: 0 if success
4184 * error code if failure
4188 zfs_map(struct inode
*ip
, offset_t off
, caddr_t
*addrp
, size_t len
,
4189 unsigned long vm_flags
)
4191 znode_t
*zp
= ITOZ(ip
);
4192 zfs_sb_t
*zsb
= ITOZSB(ip
);
4197 if ((vm_flags
& VM_WRITE
) && (zp
->z_pflags
&
4198 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4203 if ((vm_flags
& (VM_READ
| VM_EXEC
)) &&
4204 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4209 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4217 EXPORT_SYMBOL(zfs_map
);
4220 * convoff - converts the given data (start, whence) to the
4224 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4229 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4230 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4234 switch (lckdat
->l_whence
) {
4236 lckdat
->l_start
+= offset
;
4239 lckdat
->l_start
+= vap
.va_size
;
4247 if (lckdat
->l_start
< 0)
4252 lckdat
->l_start
-= offset
;
4255 lckdat
->l_start
-= vap
.va_size
;
4263 lckdat
->l_whence
= (short)whence
;
4268 * Free or allocate space in a file. Currently, this function only
4269 * supports the `F_FREESP' command. However, this command is somewhat
4270 * misnamed, as its functionality includes the ability to allocate as
4271 * well as free space.
4273 * IN: ip - inode of file to free data in.
4274 * cmd - action to take (only F_FREESP supported).
4275 * bfp - section of file to free/alloc.
4276 * flag - current file open mode flags.
4277 * offset - current file offset.
4278 * cr - credentials of caller [UNUSED].
4280 * RETURN: 0 if success
4281 * error code if failure
4284 * ip - ctime|mtime updated
4288 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4289 offset_t offset
, cred_t
*cr
)
4291 znode_t
*zp
= ITOZ(ip
);
4292 zfs_sb_t
*zsb
= ITOZSB(ip
);
4299 if (cmd
!= F_FREESP
) {
4304 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4309 if (bfp
->l_len
< 0) {
4315 * Permissions aren't checked on Solaris because on this OS
4316 * zfs_space() can only be called with an opened file handle.
4317 * On Linux we can get here through truncate_range() which
4318 * operates directly on inodes, so we need to check access rights.
4320 if ((error
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
))) {
4326 len
= bfp
->l_len
; /* 0 means from off to end of file */
4328 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4333 EXPORT_SYMBOL(zfs_space
);
4337 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4339 znode_t
*zp
= ITOZ(ip
);
4340 zfs_sb_t
*zsb
= ITOZSB(ip
);
4343 uint64_t object
= zp
->z_id
;
4350 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zsb
),
4351 &gen64
, sizeof (uint64_t))) != 0) {
4356 gen
= (uint32_t)gen64
;
4358 size
= (zsb
->z_parent
!= zsb
) ? LONG_FID_LEN
: SHORT_FID_LEN
;
4359 if (fidp
->fid_len
< size
) {
4360 fidp
->fid_len
= size
;
4365 zfid
= (zfid_short_t
*)fidp
;
4367 zfid
->zf_len
= size
;
4369 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4370 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4372 /* Must have a non-zero generation number to distinguish from .zfs */
4375 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4376 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4378 if (size
== LONG_FID_LEN
) {
4379 uint64_t objsetid
= dmu_objset_id(zsb
->z_os
);
4382 zlfid
= (zfid_long_t
*)fidp
;
4384 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
4385 zlfid
->zf_setid
[i
] = (uint8_t)(objsetid
>> (8 * i
));
4387 /* XXX - this should be the generation number for the objset */
4388 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
4389 zlfid
->zf_setgen
[i
] = 0;
4395 EXPORT_SYMBOL(zfs_fid
);
4399 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4401 znode_t
*zp
= ITOZ(ip
);
4402 zfs_sb_t
*zsb
= ITOZSB(ip
);
4404 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4408 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4413 EXPORT_SYMBOL(zfs_getsecattr
);
4417 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4419 znode_t
*zp
= ITOZ(ip
);
4420 zfs_sb_t
*zsb
= ITOZSB(ip
);
4422 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4423 zilog_t
*zilog
= zsb
->z_log
;
4428 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4430 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4431 zil_commit(zilog
, 0);
4436 EXPORT_SYMBOL(zfs_setsecattr
);
4438 #ifdef HAVE_UIO_ZEROCOPY
4440 * Tunable, both must be a power of 2.
4442 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4443 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4444 * an arcbuf for a partial block read
4446 int zcr_blksz_min
= (1 << 10); /* 1K */
4447 int zcr_blksz_max
= (1 << 17); /* 128K */
4451 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4453 znode_t
*zp
= ITOZ(ip
);
4454 zfs_sb_t
*zsb
= ITOZSB(ip
);
4455 int max_blksz
= zsb
->z_max_blksz
;
4456 uio_t
*uio
= &xuio
->xu_uio
;
4457 ssize_t size
= uio
->uio_resid
;
4458 offset_t offset
= uio
->uio_loffset
;
4463 int preamble
, postamble
;
4465 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4473 * Loan out an arc_buf for write if write size is bigger than
4474 * max_blksz, and the file's block size is also max_blksz.
4477 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4482 * Caller requests buffers for write before knowing where the
4483 * write offset might be (e.g. NFS TCP write).
4488 preamble
= P2PHASE(offset
, blksz
);
4490 preamble
= blksz
- preamble
;
4495 postamble
= P2PHASE(size
, blksz
);
4498 fullblk
= size
/ blksz
;
4499 (void) dmu_xuio_init(xuio
,
4500 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4503 * Have to fix iov base/len for partial buffers. They
4504 * currently represent full arc_buf's.
4507 /* data begins in the middle of the arc_buf */
4508 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4511 (void) dmu_xuio_add(xuio
, abuf
,
4512 blksz
- preamble
, preamble
);
4515 for (i
= 0; i
< fullblk
; i
++) {
4516 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4519 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4523 /* data ends in the middle of the arc_buf */
4524 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4527 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4532 * Loan out an arc_buf for read if the read size is larger than
4533 * the current file block size. Block alignment is not
4534 * considered. Partial arc_buf will be loaned out for read.
4536 blksz
= zp
->z_blksz
;
4537 if (blksz
< zcr_blksz_min
)
4538 blksz
= zcr_blksz_min
;
4539 if (blksz
> zcr_blksz_max
)
4540 blksz
= zcr_blksz_max
;
4541 /* avoid potential complexity of dealing with it */
4542 if (blksz
> max_blksz
) {
4547 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4561 uio
->uio_extflg
= UIO_XUIO
;
4562 XUIO_XUZC_RW(xuio
) = ioflag
;
4569 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4573 int ioflag
= XUIO_XUZC_RW(xuio
);
4575 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4577 i
= dmu_xuio_cnt(xuio
);
4579 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4581 * if abuf == NULL, it must be a write buffer
4582 * that has been returned in zfs_write().
4585 dmu_return_arcbuf(abuf
);
4586 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4589 dmu_xuio_fini(xuio
);
4592 #endif /* HAVE_UIO_ZEROCOPY */
4594 #if defined(_KERNEL) && defined(HAVE_SPL)
4595 module_param(zfs_read_chunk_size
, long, 0644);
4596 MODULE_PARM_DESC(zfs_read_chunk_size
, "Bytes to read per chunk");