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.
25 /* Portions Copyright 2007 Jeremy Teo */
26 /* Portions Copyright 2010 Robert Milkowski */
29 #include <sys/types.h>
30 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/sysmacros.h>
34 #include <sys/resource.h>
36 #include <sys/vfs_opreg.h>
40 #include <sys/taskq.h>
42 #include <sys/vmsystm.h>
43 #include <sys/atomic.h>
45 #include <sys/pathname.h>
46 #include <sys/cmn_err.h>
47 #include <sys/errno.h>
48 #include <sys/unistd.h>
49 #include <sys/zfs_dir.h>
50 #include <sys/zfs_acl.h>
51 #include <sys/zfs_ioctl.h>
52 #include <sys/fs/zfs.h>
54 #include <sys/dmu_objset.h>
60 #include <sys/dirent.h>
61 #include <sys/policy.h>
62 #include <sys/sunddi.h>
65 #include "fs/fs_subr.h"
66 #include <sys/zfs_fuid.h>
67 #include <sys/zfs_sa.h>
68 #include <sys/zfs_vnops.h>
70 #include <sys/zfs_rlock.h>
71 #include <sys/extdirent.h>
72 #include <sys/kidmap.h>
80 * Each vnode op performs some logical unit of work. To do this, the ZPL must
81 * properly lock its in-core state, create a DMU transaction, do the work,
82 * record this work in the intent log (ZIL), commit the DMU transaction,
83 * and wait for the intent log to commit if it is a synchronous operation.
84 * Moreover, the vnode ops must work in both normal and log replay context.
85 * The ordering of events is important to avoid deadlocks and references
86 * to freed memory. The example below illustrates the following Big Rules:
88 * (1) A check must be made in each zfs thread for a mounted file system.
89 * This is done avoiding races using ZFS_ENTER(zsb).
90 * A ZFS_EXIT(zsb) is needed before all returns. Any znodes
91 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
92 * can return EIO from the calling function.
94 * (2) iput() should always be the last thing except for zil_commit()
95 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
96 * First, if it's the last reference, the vnode/znode
97 * can be freed, so the zp may point to freed memory. Second, the last
98 * reference will call zfs_zinactive(), which may induce a lot of work --
99 * pushing cached pages (which acquires range locks) and syncing out
100 * cached atime changes. Third, zfs_zinactive() may require a new tx,
101 * which could deadlock the system if you were already holding one.
102 * If you must call iput() within a tx then use iput_ASYNC().
104 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
105 * as they can span dmu_tx_assign() calls.
107 * (4) Always pass TXG_NOWAIT as the second argument to dmu_tx_assign().
108 * This is critical because we don't want to block while holding locks.
109 * Note, in particular, that if a lock is sometimes acquired before
110 * the tx assigns, and sometimes after (e.g. z_lock), then failing to
111 * use a non-blocking assign can deadlock the system. The scenario:
113 * Thread A has grabbed a lock before calling dmu_tx_assign().
114 * Thread B is in an already-assigned tx, and blocks for this lock.
115 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
116 * forever, because the previous txg can't quiesce until B's tx commits.
118 * If dmu_tx_assign() returns ERESTART and zsb->z_assign is TXG_NOWAIT,
119 * then drop all locks, call dmu_tx_wait(), and try again.
121 * (5) If the operation succeeded, generate the intent log entry for it
122 * before dropping locks. This ensures that the ordering of events
123 * in the intent log matches the order in which they actually occurred.
124 * During ZIL replay the zfs_log_* functions will update the sequence
125 * number to indicate the zil transaction has replayed.
127 * (6) At the end of each vnode op, the DMU tx must always commit,
128 * regardless of whether there were any errors.
130 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
131 * to ensure that synchronous semantics are provided when necessary.
133 * In general, this is how things should be ordered in each vnode op:
135 * ZFS_ENTER(zsb); // exit if unmounted
137 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
138 * rw_enter(...); // grab any other locks you need
139 * tx = dmu_tx_create(...); // get DMU tx
140 * dmu_tx_hold_*(); // hold each object you might modify
141 * error = dmu_tx_assign(tx, TXG_NOWAIT); // try to assign
143 * rw_exit(...); // drop locks
144 * zfs_dirent_unlock(dl); // unlock directory entry
145 * iput(...); // release held vnodes
146 * if (error == ERESTART) {
151 * dmu_tx_abort(tx); // abort DMU tx
152 * ZFS_EXIT(zsb); // finished in zfs
153 * return (error); // really out of space
155 * error = do_real_work(); // do whatever this VOP does
157 * zfs_log_*(...); // on success, make ZIL entry
158 * dmu_tx_commit(tx); // commit DMU tx -- error or not
159 * rw_exit(...); // drop locks
160 * zfs_dirent_unlock(dl); // unlock directory entry
161 * iput(...); // release held vnodes
162 * zil_commit(zilog, foid); // synchronous when necessary
163 * ZFS_EXIT(zsb); // finished in zfs
164 * return (error); // done, report error
168 * Virus scanning is unsupported. It would be possible to add a hook
169 * here to performance the required virus scan. This could be done
170 * entirely in the kernel or potentially as an update to invoke a
174 zfs_vscan(struct inode
*ip
, cred_t
*cr
, int async
)
181 zfs_open(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
183 znode_t
*zp
= ITOZ(ip
);
184 zfs_sb_t
*zsb
= ITOZSB(ip
);
189 /* Honor ZFS_APPENDONLY file attribute */
190 if ((mode
& FMODE_WRITE
) && (zp
->z_pflags
& ZFS_APPENDONLY
) &&
191 ((flag
& O_APPEND
) == 0)) {
196 /* Virus scan eligible files on open */
197 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
198 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0) {
199 if (zfs_vscan(ip
, cr
, 0) != 0) {
205 /* Keep a count of the synchronous opens in the znode */
207 atomic_inc_32(&zp
->z_sync_cnt
);
212 EXPORT_SYMBOL(zfs_open
);
216 zfs_close(struct inode
*ip
, int flag
, cred_t
*cr
)
218 znode_t
*zp
= ITOZ(ip
);
219 zfs_sb_t
*zsb
= ITOZSB(ip
);
225 * Zero the synchronous opens in the znode. Under Linux the
226 * zfs_close() hook is not symmetric with zfs_open(), it is
227 * only called once when the last reference is dropped.
232 if (!zfs_has_ctldir(zp
) && zsb
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
233 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0)
234 VERIFY(zfs_vscan(ip
, cr
, 1) == 0);
239 EXPORT_SYMBOL(zfs_close
);
243 * When a file is memory mapped, we must keep the IO data synchronized
244 * between the DMU cache and the memory mapped pages. What this means:
246 * On Write: If we find a memory mapped page, we write to *both*
247 * the page and the dmu buffer.
250 update_pages(struct inode
*ip
, int64_t start
, int len
,
251 objset_t
*os
, uint64_t oid
)
253 struct address_space
*mp
= ip
->i_mapping
;
259 off
= start
& (PAGE_CACHE_SIZE
-1);
260 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
261 nbytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
263 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
265 if (mapping_writably_mapped(mp
))
266 flush_dcache_page(pp
);
269 (void) dmu_read(os
, oid
, start
+off
, nbytes
, pb
+off
,
273 if (mapping_writably_mapped(mp
))
274 flush_dcache_page(pp
);
276 mark_page_accessed(pp
);
280 page_cache_release(pp
);
289 * When a file is memory mapped, we must keep the IO data synchronized
290 * between the DMU cache and the memory mapped pages. What this means:
292 * On Read: We "read" preferentially from memory mapped pages,
293 * else we default from the dmu buffer.
295 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
296 * the file is memory mapped.
299 mappedread(struct inode
*ip
, int nbytes
, uio_t
*uio
)
301 struct address_space
*mp
= ip
->i_mapping
;
303 znode_t
*zp
= ITOZ(ip
);
304 objset_t
*os
= ITOZSB(ip
)->z_os
;
311 start
= uio
->uio_loffset
;
312 off
= start
& (PAGE_CACHE_SIZE
-1);
313 for (start
&= PAGE_CACHE_MASK
; len
> 0; start
+= PAGE_CACHE_SIZE
) {
314 bytes
= MIN(PAGE_CACHE_SIZE
- off
, len
);
316 pp
= find_lock_page(mp
, start
>> PAGE_CACHE_SHIFT
);
318 ASSERT(PageUptodate(pp
));
321 error
= uiomove(pb
+ off
, bytes
, UIO_READ
, uio
);
324 if (mapping_writably_mapped(mp
))
325 flush_dcache_page(pp
);
327 mark_page_accessed(pp
);
329 page_cache_release(pp
);
331 error
= dmu_read_uio(os
, zp
->z_id
, uio
, bytes
);
343 unsigned long zfs_read_chunk_size
= 1024 * 1024; /* Tunable */
346 * Read bytes from specified file into supplied buffer.
348 * IN: ip - inode of file to be read from.
349 * uio - structure supplying read location, range info,
351 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
352 * O_DIRECT flag; used to bypass page cache.
353 * cr - credentials of caller.
355 * OUT: uio - updated offset and range, buffer filled.
357 * RETURN: 0 if success
358 * error code if failure
361 * inode - atime updated if byte count > 0
365 zfs_read(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
367 znode_t
*zp
= ITOZ(ip
);
368 zfs_sb_t
*zsb
= ITOZSB(ip
);
373 #ifdef HAVE_UIO_ZEROCOPY
375 #endif /* HAVE_UIO_ZEROCOPY */
381 if (zp
->z_pflags
& ZFS_AV_QUARANTINED
) {
387 * Validate file offset
389 if (uio
->uio_loffset
< (offset_t
)0) {
395 * Fasttrack empty reads
397 if (uio
->uio_resid
== 0) {
402 #ifdef HAVE_MANDLOCKS
404 * Check for mandatory locks
406 if (MANDMODE(zp
->z_mode
)) {
407 if (error
= chklock(ip
, FREAD
,
408 uio
->uio_loffset
, uio
->uio_resid
, uio
->uio_fmode
, ct
)) {
413 #endif /* HAVE_MANDLOCK */
416 * If we're in FRSYNC mode, sync out this znode before reading it.
418 if (ioflag
& FRSYNC
|| zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
419 zil_commit(zsb
->z_log
, zp
->z_id
);
422 * Lock the range against changes.
424 rl
= zfs_range_lock(zp
, uio
->uio_loffset
, uio
->uio_resid
, RL_READER
);
427 * If we are reading past end-of-file we can skip
428 * to the end; but we might still need to set atime.
430 if (uio
->uio_loffset
>= zp
->z_size
) {
435 ASSERT(uio
->uio_loffset
< zp
->z_size
);
436 n
= MIN(uio
->uio_resid
, zp
->z_size
- uio
->uio_loffset
);
438 #ifdef HAVE_UIO_ZEROCOPY
439 if ((uio
->uio_extflg
== UIO_XUIO
) &&
440 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
)) {
442 int blksz
= zp
->z_blksz
;
443 uint64_t offset
= uio
->uio_loffset
;
445 xuio
= (xuio_t
*)uio
;
447 nblk
= (P2ROUNDUP(offset
+ n
, blksz
) - P2ALIGN(offset
,
450 ASSERT(offset
+ n
<= blksz
);
453 (void) dmu_xuio_init(xuio
, nblk
);
455 if (vn_has_cached_data(ip
)) {
457 * For simplicity, we always allocate a full buffer
458 * even if we only expect to read a portion of a block.
460 while (--nblk
>= 0) {
461 (void) dmu_xuio_add(xuio
,
462 dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
467 #endif /* HAVE_UIO_ZEROCOPY */
470 nbytes
= MIN(n
, zfs_read_chunk_size
-
471 P2PHASE(uio
->uio_loffset
, zfs_read_chunk_size
));
473 if (zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
474 error
= mappedread(ip
, nbytes
, uio
);
476 error
= dmu_read_uio(os
, zp
->z_id
, uio
, nbytes
);
479 /* convert checksum errors into IO errors */
488 zfs_range_unlock(rl
);
490 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
491 zfs_inode_update(zp
);
495 EXPORT_SYMBOL(zfs_read
);
498 * Write the bytes to a file.
500 * IN: ip - inode of file to be written to.
501 * uio - structure supplying write location, range info,
503 * ioflag - FAPPEND flag set if in append mode.
504 * O_DIRECT flag; used to bypass page cache.
505 * cr - credentials of caller.
507 * OUT: uio - updated offset and range.
509 * RETURN: 0 if success
510 * error code if failure
513 * ip - ctime|mtime updated if byte count > 0
518 zfs_write(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
520 znode_t
*zp
= ITOZ(ip
);
521 rlim64_t limit
= uio
->uio_limit
;
522 ssize_t start_resid
= uio
->uio_resid
;
526 zfs_sb_t
*zsb
= ZTOZSB(zp
);
531 int max_blksz
= zsb
->z_max_blksz
;
534 iovec_t
*aiov
= NULL
;
537 iovec_t
*iovp
= uio
->uio_iov
;
540 sa_bulk_attr_t bulk
[4];
541 uint64_t mtime
[2], ctime
[2];
542 ASSERTV(int iovcnt
= uio
->uio_iovcnt
);
545 * Fasttrack empty write
551 if (limit
== RLIM64_INFINITY
|| limit
> MAXOFFSET_T
)
557 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
558 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
559 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
, &zp
->z_size
, 8);
560 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
564 * If immutable or not appending then return EPERM
566 if ((zp
->z_pflags
& (ZFS_IMMUTABLE
| ZFS_READONLY
)) ||
567 ((zp
->z_pflags
& ZFS_APPENDONLY
) && !(ioflag
& FAPPEND
) &&
568 (uio
->uio_loffset
< zp
->z_size
))) {
576 * Validate file offset
578 woff
= ioflag
& FAPPEND
? zp
->z_size
: uio
->uio_loffset
;
584 #ifdef HAVE_MANDLOCKS
586 * Check for mandatory locks before calling zfs_range_lock()
587 * in order to prevent a deadlock with locks set via fcntl().
589 if (MANDMODE((mode_t
)zp
->z_mode
) &&
590 (error
= chklock(ip
, FWRITE
, woff
, n
, uio
->uio_fmode
, ct
)) != 0) {
594 #endif /* HAVE_MANDLOCKS */
596 #ifdef HAVE_UIO_ZEROCOPY
598 * Pre-fault the pages to ensure slow (eg NFS) pages
600 * Skip this if uio contains loaned arc_buf.
602 if ((uio
->uio_extflg
== UIO_XUIO
) &&
603 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
))
604 xuio
= (xuio_t
*)uio
;
606 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
607 #endif /* HAVE_UIO_ZEROCOPY */
610 * If in append mode, set the io offset pointer to eof.
612 if (ioflag
& FAPPEND
) {
614 * Obtain an appending range lock to guarantee file append
615 * semantics. We reset the write offset once we have the lock.
617 rl
= zfs_range_lock(zp
, 0, n
, RL_APPEND
);
619 if (rl
->r_len
== UINT64_MAX
) {
621 * We overlocked the file because this write will cause
622 * the file block size to increase.
623 * Note that zp_size cannot change with this lock held.
627 uio
->uio_loffset
= woff
;
630 * Note that if the file block size will change as a result of
631 * this write, then this range lock will lock the entire file
632 * so that we can re-write the block safely.
634 rl
= zfs_range_lock(zp
, woff
, n
, RL_WRITER
);
638 zfs_range_unlock(rl
);
643 if ((woff
+ n
) > limit
|| woff
> (limit
- n
))
646 /* Will this write extend the file length? */
647 write_eof
= (woff
+ n
> zp
->z_size
);
649 end_size
= MAX(zp
->z_size
, woff
+ n
);
652 * Write the file in reasonable size chunks. Each chunk is written
653 * in a separate transaction; this keeps the intent log records small
654 * and allows us to do more fine-grained space accounting.
658 woff
= uio
->uio_loffset
;
660 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
661 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
663 dmu_return_arcbuf(abuf
);
668 if (xuio
&& abuf
== NULL
) {
669 ASSERT(i_iov
< iovcnt
);
671 abuf
= dmu_xuio_arcbuf(xuio
, i_iov
);
672 dmu_xuio_clear(xuio
, i_iov
);
673 ASSERT((aiov
->iov_base
== abuf
->b_data
) ||
674 ((char *)aiov
->iov_base
- (char *)abuf
->b_data
+
675 aiov
->iov_len
== arc_buf_size(abuf
)));
677 } else if (abuf
== NULL
&& n
>= max_blksz
&&
678 woff
>= zp
->z_size
&&
679 P2PHASE(woff
, max_blksz
) == 0 &&
680 zp
->z_blksz
== max_blksz
) {
682 * This write covers a full block. "Borrow" a buffer
683 * from the dmu so that we can fill it before we enter
684 * a transaction. This avoids the possibility of
685 * holding up the transaction if the data copy hangs
686 * up on a pagefault (e.g., from an NFS server mapping).
690 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
692 ASSERT(abuf
!= NULL
);
693 ASSERT(arc_buf_size(abuf
) == max_blksz
);
694 if ((error
= uiocopy(abuf
->b_data
, max_blksz
,
695 UIO_WRITE
, uio
, &cbytes
))) {
696 dmu_return_arcbuf(abuf
);
699 ASSERT(cbytes
== max_blksz
);
703 * Start a transaction.
705 tx
= dmu_tx_create(zsb
->z_os
);
706 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
707 dmu_tx_hold_write(tx
, zp
->z_id
, woff
, MIN(n
, max_blksz
));
708 zfs_sa_upgrade_txholds(tx
, zp
);
709 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
711 if (error
== ERESTART
) {
718 dmu_return_arcbuf(abuf
);
723 * If zfs_range_lock() over-locked we grow the blocksize
724 * and then reduce the lock range. This will only happen
725 * on the first iteration since zfs_range_reduce() will
726 * shrink down r_len to the appropriate size.
728 if (rl
->r_len
== UINT64_MAX
) {
731 if (zp
->z_blksz
> max_blksz
) {
732 ASSERT(!ISP2(zp
->z_blksz
));
733 new_blksz
= MIN(end_size
, SPA_MAXBLOCKSIZE
);
735 new_blksz
= MIN(end_size
, max_blksz
);
737 zfs_grow_blocksize(zp
, new_blksz
, tx
);
738 zfs_range_reduce(rl
, woff
, n
);
742 * XXX - should we really limit each write to z_max_blksz?
743 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
745 nbytes
= MIN(n
, max_blksz
- P2PHASE(woff
, max_blksz
));
748 tx_bytes
= uio
->uio_resid
;
749 error
= dmu_write_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
751 tx_bytes
-= uio
->uio_resid
;
754 ASSERT(xuio
== NULL
|| tx_bytes
== aiov
->iov_len
);
756 * If this is not a full block write, but we are
757 * extending the file past EOF and this data starts
758 * block-aligned, use assign_arcbuf(). Otherwise,
759 * write via dmu_write().
761 if (tx_bytes
< max_blksz
&& (!write_eof
||
762 aiov
->iov_base
!= abuf
->b_data
)) {
764 dmu_write(zsb
->z_os
, zp
->z_id
, woff
,
765 aiov
->iov_len
, aiov
->iov_base
, tx
);
766 dmu_return_arcbuf(abuf
);
767 xuio_stat_wbuf_copied();
769 ASSERT(xuio
|| tx_bytes
== max_blksz
);
770 dmu_assign_arcbuf(sa_get_db(zp
->z_sa_hdl
),
773 ASSERT(tx_bytes
<= uio
->uio_resid
);
774 uioskip(uio
, tx_bytes
);
777 if (tx_bytes
&& zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
))
778 update_pages(ip
, woff
, tx_bytes
, zsb
->z_os
, zp
->z_id
);
781 * If we made no progress, we're done. If we made even
782 * partial progress, update the znode and ZIL accordingly.
785 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
786 (void *)&zp
->z_size
, sizeof (uint64_t), tx
);
793 * Clear Set-UID/Set-GID bits on successful write if not
794 * privileged and at least one of the excute bits is set.
796 * It would be nice to to this after all writes have
797 * been done, but that would still expose the ISUID/ISGID
798 * to another app after the partial write is committed.
800 * Note: we don't call zfs_fuid_map_id() here because
801 * user 0 is not an ephemeral uid.
803 mutex_enter(&zp
->z_acl_lock
);
804 if ((zp
->z_mode
& (S_IXUSR
| (S_IXUSR
>> 3) |
805 (S_IXUSR
>> 6))) != 0 &&
806 (zp
->z_mode
& (S_ISUID
| S_ISGID
)) != 0 &&
807 secpolicy_vnode_setid_retain(cr
,
808 (zp
->z_mode
& S_ISUID
) != 0 && zp
->z_uid
== 0) != 0) {
810 zp
->z_mode
&= ~(S_ISUID
| S_ISGID
);
811 newmode
= zp
->z_mode
;
812 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_MODE(zsb
),
813 (void *)&newmode
, sizeof (uint64_t), tx
);
815 mutex_exit(&zp
->z_acl_lock
);
817 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
821 * Update the file size (zp_size) if it has changed;
822 * account for possible concurrent updates.
824 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
825 (void) atomic_cas_64(&zp
->z_size
, end_size
,
830 * If we are replaying and eof is non zero then force
831 * the file size to the specified eof. Note, there's no
832 * concurrency during replay.
834 if (zsb
->z_replay
&& zsb
->z_replay_eof
!= 0)
835 zp
->z_size
= zsb
->z_replay_eof
;
837 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
839 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
);
844 ASSERT(tx_bytes
== nbytes
);
848 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
851 zfs_range_unlock(rl
);
854 * If we're in replay mode, or we made no progress, return error.
855 * Otherwise, it's at least a partial write, so it's successful.
857 if (zsb
->z_replay
|| uio
->uio_resid
== start_resid
) {
862 if (ioflag
& (FSYNC
| FDSYNC
) ||
863 zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
864 zil_commit(zilog
, zp
->z_id
);
866 zfs_inode_update(zp
);
870 EXPORT_SYMBOL(zfs_write
);
873 iput_async(struct inode
*ip
, taskq_t
*taskq
)
875 ASSERT(atomic_read(&ip
->i_count
) > 0);
876 if (atomic_read(&ip
->i_count
) == 1)
877 taskq_dispatch(taskq
, (task_func_t
*)iput
, ip
, TQ_SLEEP
);
883 zfs_get_done(zgd_t
*zgd
, int error
)
885 znode_t
*zp
= zgd
->zgd_private
;
886 objset_t
*os
= ZTOZSB(zp
)->z_os
;
889 dmu_buf_rele(zgd
->zgd_db
, zgd
);
891 zfs_range_unlock(zgd
->zgd_rl
);
894 * Release the vnode asynchronously as we currently have the
895 * txg stopped from syncing.
897 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
899 if (error
== 0 && zgd
->zgd_bp
)
900 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
902 kmem_free(zgd
, sizeof (zgd_t
));
906 static int zil_fault_io
= 0;
910 * Get data to generate a TX_WRITE intent log record.
913 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
916 objset_t
*os
= zsb
->z_os
;
918 uint64_t object
= lr
->lr_foid
;
919 uint64_t offset
= lr
->lr_offset
;
920 uint64_t size
= lr
->lr_length
;
921 blkptr_t
*bp
= &lr
->lr_blkptr
;
930 * Nothing to do if the file has been removed
932 if (zfs_zget(zsb
, object
, &zp
) != 0)
934 if (zp
->z_unlinked
) {
936 * Release the vnode asynchronously as we currently have the
937 * txg stopped from syncing.
939 iput_async(ZTOI(zp
), dsl_pool_iput_taskq(dmu_objset_pool(os
)));
943 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_SLEEP
);
944 zgd
->zgd_zilog
= zsb
->z_log
;
945 zgd
->zgd_private
= zp
;
948 * Write records come in two flavors: immediate and indirect.
949 * For small writes it's cheaper to store the data with the
950 * log record (immediate); for large writes it's cheaper to
951 * sync the data and get a pointer to it (indirect) so that
952 * we don't have to write the data twice.
954 if (buf
!= NULL
) { /* immediate write */
955 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
, RL_READER
);
956 /* test for truncation needs to be done while range locked */
957 if (offset
>= zp
->z_size
) {
960 error
= dmu_read(os
, object
, offset
, size
, buf
,
961 DMU_READ_NO_PREFETCH
);
963 ASSERT(error
== 0 || error
== ENOENT
);
964 } else { /* indirect write */
966 * Have to lock the whole block to ensure when it's
967 * written out and it's checksum is being calculated
968 * that no one can change the data. We need to re-check
969 * blocksize after we get the lock in case it's changed!
974 blkoff
= ISP2(size
) ? P2PHASE(offset
, size
) : offset
;
976 zgd
->zgd_rl
= zfs_range_lock(zp
, offset
, size
,
978 if (zp
->z_blksz
== size
)
981 zfs_range_unlock(zgd
->zgd_rl
);
983 /* test for truncation needs to be done while range locked */
984 if (lr
->lr_offset
>= zp
->z_size
)
993 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
994 DMU_READ_NO_PREFETCH
);
1000 ASSERT(db
->db_offset
== offset
);
1001 ASSERT(db
->db_size
== size
);
1003 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
1005 ASSERT(error
|| lr
->lr_length
<= zp
->z_blksz
);
1008 * On success, we need to wait for the write I/O
1009 * initiated by dmu_sync() to complete before we can
1010 * release this dbuf. We will finish everything up
1011 * in the zfs_get_done() callback.
1016 if (error
== EALREADY
) {
1017 lr
->lr_common
.lrc_txtype
= TX_WRITE2
;
1023 zfs_get_done(zgd
, error
);
1030 zfs_access(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
1032 znode_t
*zp
= ITOZ(ip
);
1033 zfs_sb_t
*zsb
= ITOZSB(ip
);
1039 if (flag
& V_ACE_MASK
)
1040 error
= zfs_zaccess(zp
, mode
, flag
, B_FALSE
, cr
);
1042 error
= zfs_zaccess_rwx(zp
, mode
, flag
, cr
);
1047 EXPORT_SYMBOL(zfs_access
);
1050 * Lookup an entry in a directory, or an extended attribute directory.
1051 * If it exists, return a held inode reference for it.
1053 * IN: dip - inode of directory to search.
1054 * nm - name of entry to lookup.
1055 * flags - LOOKUP_XATTR set if looking for an attribute.
1056 * cr - credentials of caller.
1057 * direntflags - directory lookup flags
1058 * realpnp - returned pathname.
1060 * OUT: ipp - inode of located entry, NULL if not found.
1062 * RETURN: 0 if success
1063 * error code if failure
1070 zfs_lookup(struct inode
*dip
, char *nm
, struct inode
**ipp
, int flags
,
1071 cred_t
*cr
, int *direntflags
, pathname_t
*realpnp
)
1073 znode_t
*zdp
= ITOZ(dip
);
1074 zfs_sb_t
*zsb
= ITOZSB(dip
);
1078 if (!(flags
& (LOOKUP_XATTR
| FIGNORECASE
))) {
1080 if (!S_ISDIR(dip
->i_mode
)) {
1082 } else if (zdp
->z_sa_hdl
== NULL
) {
1086 if (nm
[0] == 0 || (nm
[0] == '.' && nm
[1] == '\0')) {
1087 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1096 vnode_t
*tvp
= dnlc_lookup(dvp
, nm
);
1099 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1104 if (tvp
== DNLC_NO_VNODE
) {
1109 return (specvp_check(vpp
, cr
));
1112 #endif /* HAVE_DNLC */
1121 if (flags
& LOOKUP_XATTR
) {
1123 * If the xattr property is off, refuse the lookup request.
1125 if (!(zsb
->z_flags
& ZSB_XATTR
)) {
1131 * We don't allow recursive attributes..
1132 * Maybe someday we will.
1134 if (zdp
->z_pflags
& ZFS_XATTR
) {
1139 if ((error
= zfs_get_xattrdir(zdp
, ipp
, cr
, flags
))) {
1145 * Do we have permission to get into attribute directory?
1148 if ((error
= zfs_zaccess(ITOZ(*ipp
), ACE_EXECUTE
, 0,
1158 if (!S_ISDIR(dip
->i_mode
)) {
1164 * Check accessibility of directory.
1167 if ((error
= zfs_zaccess(zdp
, ACE_EXECUTE
, 0, B_FALSE
, cr
))) {
1172 if (zsb
->z_utf8
&& u8_validate(nm
, strlen(nm
),
1173 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1178 error
= zfs_dirlook(zdp
, nm
, ipp
, flags
, direntflags
, realpnp
);
1179 if ((error
== 0) && (*ipp
))
1180 zfs_inode_update(ITOZ(*ipp
));
1185 EXPORT_SYMBOL(zfs_lookup
);
1188 * Attempt to create a new entry in a directory. If the entry
1189 * already exists, truncate the file if permissible, else return
1190 * an error. Return the ip of the created or trunc'd file.
1192 * IN: dip - inode of directory to put new file entry in.
1193 * name - name of new file entry.
1194 * vap - attributes of new file.
1195 * excl - flag indicating exclusive or non-exclusive mode.
1196 * mode - mode to open file with.
1197 * cr - credentials of caller.
1198 * flag - large file flag [UNUSED].
1199 * vsecp - ACL to be set
1201 * OUT: ipp - inode of created or trunc'd entry.
1203 * RETURN: 0 if success
1204 * error code if failure
1207 * dip - ctime|mtime updated if new entry created
1208 * ip - ctime|mtime always, atime if new
1213 zfs_create(struct inode
*dip
, char *name
, vattr_t
*vap
, int excl
,
1214 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1216 znode_t
*zp
, *dzp
= ITOZ(dip
);
1217 zfs_sb_t
*zsb
= ITOZSB(dip
);
1225 zfs_acl_ids_t acl_ids
;
1226 boolean_t fuid_dirtied
;
1227 boolean_t have_acl
= B_FALSE
;
1230 * If we have an ephemeral id, ACL, or XVATTR then
1231 * make sure file system is at proper version
1237 if (zsb
->z_use_fuids
== B_FALSE
&&
1238 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1246 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
1247 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1252 if (vap
->va_mask
& ATTR_XVATTR
) {
1253 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1254 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1262 if (*name
== '\0') {
1264 * Null component name refers to the directory itself.
1271 /* possible igrab(zp) */
1274 if (flag
& FIGNORECASE
)
1277 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1281 zfs_acl_ids_free(&acl_ids
);
1282 if (strcmp(name
, "..") == 0)
1293 * Create a new file object and update the directory
1296 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1298 zfs_acl_ids_free(&acl_ids
);
1303 * We only support the creation of regular files in
1304 * extended attribute directories.
1307 if ((dzp
->z_pflags
& ZFS_XATTR
) && !S_ISREG(vap
->va_mode
)) {
1309 zfs_acl_ids_free(&acl_ids
);
1314 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1315 cr
, vsecp
, &acl_ids
)) != 0)
1319 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1320 zfs_acl_ids_free(&acl_ids
);
1325 tx
= dmu_tx_create(os
);
1327 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1328 ZFS_SA_BASE_ATTR_SIZE
);
1330 fuid_dirtied
= zsb
->z_fuid_dirty
;
1332 zfs_fuid_txhold(zsb
, tx
);
1333 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
1334 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
1335 if (!zsb
->z_use_sa
&&
1336 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1337 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1338 0, acl_ids
.z_aclp
->z_acl_bytes
);
1340 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1342 zfs_dirent_unlock(dl
);
1343 if (error
== ERESTART
) {
1348 zfs_acl_ids_free(&acl_ids
);
1353 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1356 zfs_fuid_sync(zsb
, tx
);
1358 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1359 txtype
= zfs_log_create_txtype(Z_FILE
, vsecp
, vap
);
1360 if (flag
& FIGNORECASE
)
1362 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, name
,
1363 vsecp
, acl_ids
.z_fuidp
, vap
);
1364 zfs_acl_ids_free(&acl_ids
);
1367 int aflags
= (flag
& FAPPEND
) ? V_APPEND
: 0;
1370 zfs_acl_ids_free(&acl_ids
);
1374 * A directory entry already exists for this name.
1377 * Can't truncate an existing file if in exclusive mode.
1384 * Can't open a directory for writing.
1386 if (S_ISDIR(ZTOI(zp
)->i_mode
)) {
1391 * Verify requested access to file.
1393 if (mode
&& (error
= zfs_zaccess_rwx(zp
, mode
, aflags
, cr
))) {
1397 mutex_enter(&dzp
->z_lock
);
1399 mutex_exit(&dzp
->z_lock
);
1402 * Truncate regular files if requested.
1404 if (S_ISREG(ZTOI(zp
)->i_mode
) &&
1405 (vap
->va_mask
& ATTR_SIZE
) && (vap
->va_size
== 0)) {
1406 /* we can't hold any locks when calling zfs_freesp() */
1407 zfs_dirent_unlock(dl
);
1409 error
= zfs_freesp(zp
, 0, 0, mode
, TRUE
);
1415 zfs_dirent_unlock(dl
);
1421 zfs_inode_update(dzp
);
1422 zfs_inode_update(zp
);
1426 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1427 zil_commit(zilog
, 0);
1432 EXPORT_SYMBOL(zfs_create
);
1435 * Remove an entry from a directory.
1437 * IN: dip - inode of directory to remove entry from.
1438 * name - name of entry to remove.
1439 * cr - credentials of caller.
1441 * RETURN: 0 if success
1442 * error code if failure
1446 * ip - ctime (if nlink > 0)
1449 uint64_t null_xattr
= 0;
1453 zfs_remove(struct inode
*dip
, char *name
, cred_t
*cr
)
1455 znode_t
*zp
, *dzp
= ITOZ(dip
);
1458 zfs_sb_t
*zsb
= ITOZSB(dip
);
1461 uint64_t xattr_obj_unlinked
= 0;
1467 pathname_t
*realnmp
= NULL
;
1468 #ifdef HAVE_PN_UTILS
1470 #endif /* HAVE_PN_UTILS */
1478 #ifdef HAVE_PN_UTILS
1479 if (flags
& FIGNORECASE
) {
1484 #endif /* HAVE_PN_UTILS */
1490 * Attempt to lock directory; fail if entry doesn't exist.
1492 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1494 #ifdef HAVE_PN_UTILS
1497 #endif /* HAVE_PN_UTILS */
1504 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1509 * Need to use rmdir for removing directories.
1511 if (S_ISDIR(ip
->i_mode
)) {
1518 dnlc_remove(dvp
, realnmp
->pn_buf
);
1520 dnlc_remove(dvp
, name
);
1521 #endif /* HAVE_DNLC */
1524 * We never delete the znode and always place it in the unlinked
1525 * set. The dentry cache will always hold the last reference and
1526 * is responsible for safely freeing the znode.
1529 tx
= dmu_tx_create(zsb
->z_os
);
1530 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1531 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1532 zfs_sa_upgrade_txholds(tx
, zp
);
1533 zfs_sa_upgrade_txholds(tx
, dzp
);
1535 /* are there any extended attributes? */
1536 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1537 &xattr_obj
, sizeof (xattr_obj
));
1538 if (error
== 0 && xattr_obj
) {
1539 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
1540 ASSERT3U(error
, ==, 0);
1541 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1542 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1545 /* charge as an update -- would be nice not to charge at all */
1546 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1548 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1550 zfs_dirent_unlock(dl
);
1554 if (error
== ERESTART
) {
1559 #ifdef HAVE_PN_UTILS
1562 #endif /* HAVE_PN_UTILS */
1569 * Remove the directory entry.
1571 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1580 * Hold z_lock so that we can make sure that the ACL obj
1581 * hasn't changed. Could have been deleted due to
1584 mutex_enter(&zp
->z_lock
);
1585 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
1586 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1587 mutex_exit(&zp
->z_lock
);
1588 zfs_unlinked_add(zp
, tx
);
1592 #ifdef HAVE_PN_UTILS
1593 if (flags
& FIGNORECASE
)
1595 #endif /* HAVE_PN_UTILS */
1596 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1600 #ifdef HAVE_PN_UTILS
1603 #endif /* HAVE_PN_UTILS */
1605 zfs_dirent_unlock(dl
);
1606 zfs_inode_update(dzp
);
1607 zfs_inode_update(zp
);
1609 zfs_inode_update(xzp
);
1615 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1616 zil_commit(zilog
, 0);
1621 EXPORT_SYMBOL(zfs_remove
);
1624 * Create a new directory and insert it into dip using the name
1625 * provided. Return a pointer to the inserted directory.
1627 * IN: dip - inode of directory to add subdir to.
1628 * dirname - name of new directory.
1629 * vap - attributes of new directory.
1630 * cr - credentials of caller.
1631 * vsecp - ACL to be set
1633 * OUT: ipp - inode of created directory.
1635 * RETURN: 0 if success
1636 * error code if failure
1639 * dip - ctime|mtime updated
1640 * ipp - ctime|mtime|atime updated
1644 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1645 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1647 znode_t
*zp
, *dzp
= ITOZ(dip
);
1648 zfs_sb_t
*zsb
= ITOZSB(dip
);
1656 gid_t gid
= crgetgid(cr
);
1657 zfs_acl_ids_t acl_ids
;
1658 boolean_t fuid_dirtied
;
1660 ASSERT(S_ISDIR(vap
->va_mode
));
1663 * If we have an ephemeral id, ACL, or XVATTR then
1664 * make sure file system is at proper version
1668 if (zsb
->z_use_fuids
== B_FALSE
&&
1669 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1676 if (dzp
->z_pflags
& ZFS_XATTR
) {
1681 if (zsb
->z_utf8
&& u8_validate(dirname
,
1682 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1686 if (flags
& FIGNORECASE
)
1689 if (vap
->va_mask
& ATTR_XVATTR
) {
1690 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1691 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1697 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1698 vsecp
, &acl_ids
)) != 0) {
1703 * First make sure the new directory doesn't exist.
1705 * Existence is checked first to make sure we don't return
1706 * EACCES instead of EEXIST which can cause some applications
1712 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1714 zfs_acl_ids_free(&acl_ids
);
1719 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1720 zfs_acl_ids_free(&acl_ids
);
1721 zfs_dirent_unlock(dl
);
1726 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
1727 zfs_acl_ids_free(&acl_ids
);
1728 zfs_dirent_unlock(dl
);
1734 * Add a new entry to the directory.
1736 tx
= dmu_tx_create(zsb
->z_os
);
1737 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
1738 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
1739 fuid_dirtied
= zsb
->z_fuid_dirty
;
1741 zfs_fuid_txhold(zsb
, tx
);
1742 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1743 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
1744 acl_ids
.z_aclp
->z_acl_bytes
);
1747 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1748 ZFS_SA_BASE_ATTR_SIZE
);
1750 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1752 zfs_dirent_unlock(dl
);
1753 if (error
== ERESTART
) {
1758 zfs_acl_ids_free(&acl_ids
);
1767 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1770 zfs_fuid_sync(zsb
, tx
);
1773 * Now put new name in parent dir.
1775 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1779 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
1780 if (flags
& FIGNORECASE
)
1782 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
1783 acl_ids
.z_fuidp
, vap
);
1785 zfs_acl_ids_free(&acl_ids
);
1789 zfs_dirent_unlock(dl
);
1791 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1792 zil_commit(zilog
, 0);
1794 zfs_inode_update(dzp
);
1795 zfs_inode_update(zp
);
1799 EXPORT_SYMBOL(zfs_mkdir
);
1802 * Remove a directory subdir entry. If the current working
1803 * directory is the same as the subdir to be removed, the
1806 * IN: dip - inode of directory to remove from.
1807 * name - name of directory to be removed.
1808 * cwd - inode of current working directory.
1809 * cr - credentials of caller.
1810 * flags - case flags
1812 * RETURN: 0 if success
1813 * error code if failure
1816 * dip - ctime|mtime updated
1820 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
1823 znode_t
*dzp
= ITOZ(dip
);
1826 zfs_sb_t
*zsb
= ITOZSB(dip
);
1837 if (flags
& FIGNORECASE
)
1843 * Attempt to lock directory; fail if entry doesn't exist.
1845 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1853 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1857 if (!S_ISDIR(ip
->i_mode
)) {
1868 * Grab a lock on the directory to make sure that noone is
1869 * trying to add (or lookup) entries while we are removing it.
1871 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
1874 * Grab a lock on the parent pointer to make sure we play well
1875 * with the treewalk and directory rename code.
1877 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
1879 tx
= dmu_tx_create(zsb
->z_os
);
1880 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1881 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1882 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
1883 zfs_sa_upgrade_txholds(tx
, zp
);
1884 zfs_sa_upgrade_txholds(tx
, dzp
);
1885 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
1887 rw_exit(&zp
->z_parent_lock
);
1888 rw_exit(&zp
->z_name_lock
);
1889 zfs_dirent_unlock(dl
);
1891 if (error
== ERESTART
) {
1901 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
1904 uint64_t txtype
= TX_RMDIR
;
1905 if (flags
& FIGNORECASE
)
1907 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
1912 rw_exit(&zp
->z_parent_lock
);
1913 rw_exit(&zp
->z_name_lock
);
1915 zfs_dirent_unlock(dl
);
1919 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1920 zil_commit(zilog
, 0);
1922 zfs_inode_update(dzp
);
1923 zfs_inode_update(zp
);
1927 EXPORT_SYMBOL(zfs_rmdir
);
1930 * Read as many directory entries as will fit into the provided
1931 * dirent buffer from the given directory cursor position.
1933 * IN: ip - inode of directory to read.
1934 * dirent - buffer for directory entries.
1936 * OUT: dirent - filler buffer of directory entries.
1938 * RETURN: 0 if success
1939 * error code if failure
1942 * ip - atime updated
1944 * Note that the low 4 bits of the cookie returned by zap is always zero.
1945 * This allows us to use the low range for "special" directory entries:
1946 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
1947 * we use the offset 2 for the '.zfs' directory.
1951 zfs_readdir(struct inode
*ip
, void *dirent
, filldir_t filldir
,
1952 loff_t
*pos
, cred_t
*cr
)
1954 znode_t
*zp
= ITOZ(ip
);
1955 zfs_sb_t
*zsb
= ITOZSB(ip
);
1958 zap_attribute_t zap
;
1968 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
1969 &parent
, sizeof (parent
))) != 0)
1973 * Quit if directory has been removed (posix)
1980 prefetch
= zp
->z_zn_prefetch
;
1983 * Initialize the iterator cursor.
1987 * Start iteration from the beginning of the directory.
1989 zap_cursor_init(&zc
, os
, zp
->z_id
);
1992 * The offset is a serialized cursor.
1994 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, *pos
);
1998 * Transform to file-system independent format
2005 * Special case `.', `..', and `.zfs'.
2008 (void) strcpy(zap
.za_name
, ".");
2009 zap
.za_normalization_conflict
= 0;
2011 } else if (*pos
== 1) {
2012 (void) strcpy(zap
.za_name
, "..");
2013 zap
.za_normalization_conflict
= 0;
2015 } else if (*pos
== 2 && zfs_show_ctldir(zp
)) {
2016 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
2017 zap
.za_normalization_conflict
= 0;
2018 objnum
= ZFSCTL_INO_ROOT
;
2023 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
2024 if (error
== ENOENT
)
2030 if (zap
.za_integer_length
!= 8 ||
2031 zap
.za_num_integers
!= 1) {
2032 cmn_err(CE_WARN
, "zap_readdir: bad directory "
2033 "entry, obj = %lld, offset = %lld\n",
2034 (u_longlong_t
)zp
->z_id
,
2035 (u_longlong_t
)*pos
);
2040 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
2042 done
= filldir(dirent
, zap
.za_name
, strlen(zap
.za_name
),
2043 zap_cursor_serialize(&zc
), objnum
, 0);
2048 /* Prefetch znode */
2050 dmu_prefetch(os
, objnum
, 0, 0);
2054 zap_cursor_advance(&zc
);
2055 *pos
= zap_cursor_serialize(&zc
);
2060 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
2063 zap_cursor_fini(&zc
);
2064 if (error
== ENOENT
)
2067 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
2068 zfs_inode_update(zp
);
2075 EXPORT_SYMBOL(zfs_readdir
);
2077 ulong_t zfs_fsync_sync_cnt
= 4;
2080 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2082 znode_t
*zp
= ITOZ(ip
);
2083 zfs_sb_t
*zsb
= ITOZSB(ip
);
2085 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2087 if (zsb
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2090 zil_commit(zsb
->z_log
, zp
->z_id
);
2095 EXPORT_SYMBOL(zfs_fsync
);
2099 * Get the requested file attributes and place them in the provided
2102 * IN: ip - inode of file.
2103 * vap - va_mask identifies requested attributes.
2104 * If ATTR_XVATTR set, then optional attrs are requested
2105 * flags - ATTR_NOACLCHECK (CIFS server context)
2106 * cr - credentials of caller.
2108 * OUT: vap - attribute values.
2110 * RETURN: 0 (always succeeds)
2114 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2116 znode_t
*zp
= ITOZ(ip
);
2117 zfs_sb_t
*zsb
= ITOZSB(ip
);
2120 uint64_t mtime
[2], ctime
[2];
2121 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2122 xoptattr_t
*xoap
= NULL
;
2123 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2124 sa_bulk_attr_t bulk
[2];
2130 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2132 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
, &mtime
, 16);
2133 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
, &ctime
, 16);
2135 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2141 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2142 * Also, if we are the owner don't bother, since owner should
2143 * always be allowed to read basic attributes of file.
2145 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2146 (vap
->va_uid
!= crgetuid(cr
))) {
2147 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2155 * Return all attributes. It's cheaper to provide the answer
2156 * than to determine whether we were asked the question.
2159 mutex_enter(&zp
->z_lock
);
2160 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2161 vap
->va_mode
= zp
->z_mode
;
2162 vap
->va_fsid
= ZTOI(zp
)->i_sb
->s_dev
;
2163 vap
->va_nodeid
= zp
->z_id
;
2164 if ((zp
->z_id
== zsb
->z_root
) && zfs_show_ctldir(zp
))
2165 links
= zp
->z_links
+ 1;
2167 links
= zp
->z_links
;
2168 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2169 vap
->va_size
= i_size_read(ip
);
2170 vap
->va_rdev
= ip
->i_rdev
;
2171 vap
->va_seq
= ip
->i_generation
;
2174 * Add in any requested optional attributes and the create time.
2175 * Also set the corresponding bits in the returned attribute bitmap.
2177 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zsb
->z_use_fuids
) {
2178 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2180 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2181 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2184 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2185 xoap
->xoa_readonly
=
2186 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2187 XVA_SET_RTN(xvap
, XAT_READONLY
);
2190 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2192 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2193 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2196 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2198 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2199 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2202 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2203 xoap
->xoa_nounlink
=
2204 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2205 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2208 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2209 xoap
->xoa_immutable
=
2210 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2211 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2214 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2215 xoap
->xoa_appendonly
=
2216 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2217 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2220 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2222 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2223 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2226 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2228 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2229 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2232 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2233 xoap
->xoa_av_quarantined
=
2234 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2235 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2238 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2239 xoap
->xoa_av_modified
=
2240 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2241 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2244 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2245 S_ISREG(ip
->i_mode
)) {
2246 zfs_sa_get_scanstamp(zp
, xvap
);
2249 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2252 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zsb
),
2253 times
, sizeof (times
));
2254 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2255 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2258 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2259 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2260 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2262 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2263 xoap
->xoa_generation
= zp
->z_gen
;
2264 XVA_SET_RTN(xvap
, XAT_GEN
);
2267 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2269 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2270 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2273 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2275 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2276 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2280 ZFS_TIME_DECODE(&vap
->va_atime
, zp
->z_atime
);
2281 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2282 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2284 mutex_exit(&zp
->z_lock
);
2286 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2288 if (zp
->z_blksz
== 0) {
2290 * Block size hasn't been set; suggest maximal I/O transfers.
2292 vap
->va_blksize
= zsb
->z_max_blksz
;
2298 EXPORT_SYMBOL(zfs_getattr
);
2301 * Set the file attributes to the values contained in the
2304 * IN: ip - inode of file to be modified.
2305 * vap - new attribute values.
2306 * If ATTR_XVATTR set, then optional attrs are being set
2307 * flags - ATTR_UTIME set if non-default time values provided.
2308 * - ATTR_NOACLCHECK (CIFS context only).
2309 * cr - credentials of caller.
2311 * RETURN: 0 if success
2312 * error code if failure
2315 * ip - ctime updated, mtime updated if size changed.
2319 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2321 znode_t
*zp
= ITOZ(ip
);
2322 zfs_sb_t
*zsb
= ITOZSB(ip
);
2326 xvattr_t
*tmpxvattr
;
2327 uint_t mask
= vap
->va_mask
;
2331 uint64_t new_uid
, new_gid
;
2333 uint64_t mtime
[2], ctime
[2];
2335 int need_policy
= FALSE
;
2337 zfs_fuid_info_t
*fuidp
= NULL
;
2338 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2341 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2342 boolean_t fuid_dirtied
= B_FALSE
;
2343 sa_bulk_attr_t
*bulk
, *xattr_bulk
;
2344 int count
= 0, xattr_count
= 0;
2355 * Make sure that if we have ephemeral uid/gid or xvattr specified
2356 * that file system is at proper version level
2359 if (zsb
->z_use_fuids
== B_FALSE
&&
2360 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2361 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2362 (mask
& ATTR_XVATTR
))) {
2367 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2372 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2378 * If this is an xvattr_t, then get a pointer to the structure of
2379 * optional attributes. If this is NULL, then we have a vattr_t.
2381 xoap
= xva_getxoptattr(xvap
);
2383 tmpxvattr
= kmem_alloc(sizeof(xvattr_t
), KM_SLEEP
);
2384 xva_init(tmpxvattr
);
2386 bulk
= kmem_alloc(sizeof(sa_bulk_attr_t
) * 7, KM_SLEEP
);
2387 xattr_bulk
= kmem_alloc(sizeof(sa_bulk_attr_t
) * 7, KM_SLEEP
);
2390 * Immutable files can only alter immutable bit and atime
2392 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2393 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2394 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2399 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2405 * Verify timestamps doesn't overflow 32 bits.
2406 * ZFS can handle large timestamps, but 32bit syscalls can't
2407 * handle times greater than 2039. This check should be removed
2408 * once large timestamps are fully supported.
2410 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2411 if (((mask
& ATTR_ATIME
) && TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2412 ((mask
& ATTR_MTIME
) && TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2422 /* Can this be moved to before the top label? */
2423 if (zfs_is_readonly(zsb
)) {
2429 * First validate permissions
2432 if (mask
& ATTR_SIZE
) {
2433 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2437 truncate_setsize(ip
, vap
->va_size
);
2440 * XXX - Note, we are not providing any open
2441 * mode flags here (like FNDELAY), so we may
2442 * block if there are locks present... this
2443 * should be addressed in openat().
2445 /* XXX - would it be OK to generate a log record here? */
2446 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2451 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2452 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2453 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2454 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2455 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2456 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2457 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2458 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2459 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2463 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2464 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2469 * NOTE: even if a new mode is being set,
2470 * we may clear S_ISUID/S_ISGID bits.
2473 if (!(mask
& ATTR_MODE
))
2474 vap
->va_mode
= zp
->z_mode
;
2477 * Take ownership or chgrp to group we are a member of
2480 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2481 take_group
= (mask
& ATTR_GID
) &&
2482 zfs_groupmember(zsb
, vap
->va_gid
, cr
);
2485 * If both ATTR_UID and ATTR_GID are set then take_owner and
2486 * take_group must both be set in order to allow taking
2489 * Otherwise, send the check through secpolicy_vnode_setattr()
2493 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2494 take_owner
&& take_group
) ||
2495 ((idmask
== ATTR_UID
) && take_owner
) ||
2496 ((idmask
== ATTR_GID
) && take_group
)) {
2497 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2498 skipaclchk
, cr
) == 0) {
2500 * Remove setuid/setgid for non-privileged users
2502 (void) secpolicy_setid_clear(vap
, cr
);
2503 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2512 mutex_enter(&zp
->z_lock
);
2513 oldva
.va_mode
= zp
->z_mode
;
2514 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2515 if (mask
& ATTR_XVATTR
) {
2517 * Update xvattr mask to include only those attributes
2518 * that are actually changing.
2520 * the bits will be restored prior to actually setting
2521 * the attributes so the caller thinks they were set.
2523 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2524 if (xoap
->xoa_appendonly
!=
2525 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2528 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2529 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2533 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2534 if (xoap
->xoa_nounlink
!=
2535 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2538 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2539 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2543 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2544 if (xoap
->xoa_immutable
!=
2545 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2548 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2549 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2553 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2554 if (xoap
->xoa_nodump
!=
2555 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2558 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2559 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2563 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2564 if (xoap
->xoa_av_modified
!=
2565 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2568 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2569 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2573 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2574 if ((!S_ISREG(ip
->i_mode
) &&
2575 xoap
->xoa_av_quarantined
) ||
2576 xoap
->xoa_av_quarantined
!=
2577 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2580 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2581 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2585 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2586 mutex_exit(&zp
->z_lock
);
2591 if (need_policy
== FALSE
&&
2592 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2593 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2598 mutex_exit(&zp
->z_lock
);
2600 if (mask
& ATTR_MODE
) {
2601 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2602 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2607 trim_mask
|= ATTR_MODE
;
2615 * If trim_mask is set then take ownership
2616 * has been granted or write_acl is present and user
2617 * has the ability to modify mode. In that case remove
2618 * UID|GID and or MODE from mask so that
2619 * secpolicy_vnode_setattr() doesn't revoke it.
2623 saved_mask
= vap
->va_mask
;
2624 vap
->va_mask
&= ~trim_mask
;
2626 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2627 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2632 vap
->va_mask
|= saved_mask
;
2636 * secpolicy_vnode_setattr, or take ownership may have
2639 mask
= vap
->va_mask
;
2641 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2642 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
2643 &xattr_obj
, sizeof (xattr_obj
));
2645 if (err
== 0 && xattr_obj
) {
2646 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
2650 if (mask
& ATTR_UID
) {
2651 new_uid
= zfs_fuid_create(zsb
,
2652 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
2653 if (new_uid
!= zp
->z_uid
&&
2654 zfs_fuid_overquota(zsb
, B_FALSE
, new_uid
)) {
2662 if (mask
& ATTR_GID
) {
2663 new_gid
= zfs_fuid_create(zsb
, (uint64_t)vap
->va_gid
,
2664 cr
, ZFS_GROUP
, &fuidp
);
2665 if (new_gid
!= zp
->z_gid
&&
2666 zfs_fuid_overquota(zsb
, B_TRUE
, new_gid
)) {
2674 tx
= dmu_tx_create(zsb
->z_os
);
2676 if (mask
& ATTR_MODE
) {
2677 uint64_t pmode
= zp
->z_mode
;
2679 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
2681 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
2683 mutex_enter(&zp
->z_lock
);
2684 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
2686 * Are we upgrading ACL from old V0 format
2689 if (zsb
->z_version
>= ZPL_VERSION_FUID
&&
2690 zfs_znode_acl_version(zp
) ==
2691 ZFS_ACL_VERSION_INITIAL
) {
2692 dmu_tx_hold_free(tx
, acl_obj
, 0,
2694 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2695 0, aclp
->z_acl_bytes
);
2697 dmu_tx_hold_write(tx
, acl_obj
, 0,
2700 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
2701 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
2702 0, aclp
->z_acl_bytes
);
2704 mutex_exit(&zp
->z_lock
);
2705 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2707 if ((mask
& ATTR_XVATTR
) &&
2708 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2709 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
2711 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2715 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
2718 fuid_dirtied
= zsb
->z_fuid_dirty
;
2720 zfs_fuid_txhold(zsb
, tx
);
2722 zfs_sa_upgrade_txholds(tx
, zp
);
2724 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
2726 if (err
== ERESTART
)
2733 * Set each attribute requested.
2734 * We group settings according to the locks they need to acquire.
2736 * Note: you cannot set ctime directly, although it will be
2737 * updated as a side-effect of calling this function.
2741 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2742 mutex_enter(&zp
->z_acl_lock
);
2743 mutex_enter(&zp
->z_lock
);
2745 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
2746 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
2749 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2750 mutex_enter(&attrzp
->z_acl_lock
);
2751 mutex_enter(&attrzp
->z_lock
);
2752 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2753 SA_ZPL_FLAGS(zsb
), NULL
, &attrzp
->z_pflags
,
2754 sizeof (attrzp
->z_pflags
));
2757 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2759 if (mask
& ATTR_UID
) {
2760 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zsb
), NULL
,
2761 &new_uid
, sizeof (new_uid
));
2762 zp
->z_uid
= new_uid
;
2764 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2765 SA_ZPL_UID(zsb
), NULL
, &new_uid
,
2767 attrzp
->z_uid
= new_uid
;
2771 if (mask
& ATTR_GID
) {
2772 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zsb
),
2773 NULL
, &new_gid
, sizeof (new_gid
));
2774 zp
->z_gid
= new_gid
;
2776 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2777 SA_ZPL_GID(zsb
), NULL
, &new_gid
,
2779 attrzp
->z_gid
= new_gid
;
2782 if (!(mask
& ATTR_MODE
)) {
2783 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
),
2784 NULL
, &new_mode
, sizeof (new_mode
));
2785 new_mode
= zp
->z_mode
;
2787 err
= zfs_acl_chown_setattr(zp
);
2790 err
= zfs_acl_chown_setattr(attrzp
);
2795 if (mask
& ATTR_MODE
) {
2796 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zsb
), NULL
,
2797 &new_mode
, sizeof (new_mode
));
2798 zp
->z_mode
= new_mode
;
2799 ASSERT3P(aclp
, !=, NULL
);
2800 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
2801 ASSERT3U(err
, ==, 0);
2802 if (zp
->z_acl_cached
)
2803 zfs_acl_free(zp
->z_acl_cached
);
2804 zp
->z_acl_cached
= aclp
;
2809 if (mask
& ATTR_ATIME
) {
2810 ZFS_TIME_ENCODE(&vap
->va_atime
, zp
->z_atime
);
2811 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zsb
), NULL
,
2812 &zp
->z_atime
, sizeof (zp
->z_atime
));
2815 if (mask
& ATTR_MTIME
) {
2816 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
2817 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
2818 mtime
, sizeof (mtime
));
2821 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
2822 if (mask
& ATTR_SIZE
&& !(mask
& ATTR_MTIME
)) {
2823 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
2824 NULL
, mtime
, sizeof (mtime
));
2825 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2826 &ctime
, sizeof (ctime
));
2827 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
2829 } else if (mask
!= 0) {
2830 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
2831 &ctime
, sizeof (ctime
));
2832 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
2835 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
2836 SA_ZPL_CTIME(zsb
), NULL
,
2837 &ctime
, sizeof (ctime
));
2838 zfs_tstamp_update_setup(attrzp
, STATE_CHANGED
,
2839 mtime
, ctime
, B_TRUE
);
2843 * Do this after setting timestamps to prevent timestamp
2844 * update from toggling bit
2847 if (xoap
&& (mask
& ATTR_XVATTR
)) {
2850 * restore trimmed off masks
2851 * so that return masks can be set for caller.
2854 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
2855 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
2857 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
2858 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
2860 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
2861 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
2863 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
2864 XVA_SET_REQ(xvap
, XAT_NODUMP
);
2866 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
2867 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
2869 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
2870 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
2873 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
2874 ASSERT(S_ISREG(ip
->i_mode
));
2876 zfs_xvattr_set(zp
, xvap
, tx
);
2880 zfs_fuid_sync(zsb
, tx
);
2883 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
2885 mutex_exit(&zp
->z_lock
);
2886 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2887 mutex_exit(&zp
->z_acl_lock
);
2890 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
2891 mutex_exit(&attrzp
->z_acl_lock
);
2892 mutex_exit(&attrzp
->z_lock
);
2895 if (err
== 0 && attrzp
) {
2896 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
2907 zfs_fuid_info_free(fuidp
);
2913 if (err
== ERESTART
)
2916 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
2918 zfs_inode_update(zp
);
2922 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2923 zil_commit(zilog
, 0);
2926 kmem_free(xattr_bulk
, sizeof(sa_bulk_attr_t
) * 7);
2927 kmem_free(bulk
, sizeof(sa_bulk_attr_t
) * 7);
2928 kmem_free(tmpxvattr
, sizeof(xvattr_t
));
2932 EXPORT_SYMBOL(zfs_setattr
);
2934 typedef struct zfs_zlock
{
2935 krwlock_t
*zl_rwlock
; /* lock we acquired */
2936 znode_t
*zl_znode
; /* znode we held */
2937 struct zfs_zlock
*zl_next
; /* next in list */
2941 * Drop locks and release vnodes that were held by zfs_rename_lock().
2944 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
2948 while ((zl
= *zlpp
) != NULL
) {
2949 if (zl
->zl_znode
!= NULL
)
2950 iput(ZTOI(zl
->zl_znode
));
2951 rw_exit(zl
->zl_rwlock
);
2952 *zlpp
= zl
->zl_next
;
2953 kmem_free(zl
, sizeof (*zl
));
2958 * Search back through the directory tree, using the ".." entries.
2959 * Lock each directory in the chain to prevent concurrent renames.
2960 * Fail any attempt to move a directory into one of its own descendants.
2961 * XXX - z_parent_lock can overlap with map or grow locks
2964 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
2968 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
2969 uint64_t oidp
= zp
->z_id
;
2970 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
2971 krw_t rw
= RW_WRITER
;
2974 * First pass write-locks szp and compares to zp->z_id.
2975 * Later passes read-lock zp and compare to zp->z_parent.
2978 if (!rw_tryenter(rwlp
, rw
)) {
2980 * Another thread is renaming in this path.
2981 * Note that if we are a WRITER, we don't have any
2982 * parent_locks held yet.
2984 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
2986 * Drop our locks and restart
2988 zfs_rename_unlock(&zl
);
2992 rwlp
= &szp
->z_parent_lock
;
2997 * Wait for other thread to drop its locks
3003 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
3004 zl
->zl_rwlock
= rwlp
;
3005 zl
->zl_znode
= NULL
;
3006 zl
->zl_next
= *zlpp
;
3009 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
3012 if (oidp
== rootid
) /* We've hit the top */
3015 if (rw
== RW_READER
) { /* i.e. not the first pass */
3016 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
3021 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
3022 &oidp
, sizeof (oidp
));
3023 rwlp
= &zp
->z_parent_lock
;
3026 } while (zp
->z_id
!= sdzp
->z_id
);
3032 * Move an entry from the provided source directory to the target
3033 * directory. Change the entry name as indicated.
3035 * IN: sdip - Source directory containing the "old entry".
3036 * snm - Old entry name.
3037 * tdip - Target directory to contain the "new entry".
3038 * tnm - New entry name.
3039 * cr - credentials of caller.
3040 * flags - case flags
3042 * RETURN: 0 if success
3043 * error code if failure
3046 * sdip,tdip - ctime|mtime updated
3050 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
3051 cred_t
*cr
, int flags
)
3053 znode_t
*tdzp
, *szp
, *tzp
;
3054 znode_t
*sdzp
= ITOZ(sdip
);
3055 zfs_sb_t
*zsb
= ITOZSB(sdip
);
3057 zfs_dirlock_t
*sdl
, *tdl
;
3060 int cmp
, serr
, terr
;
3065 ZFS_VERIFY_ZP(sdzp
);
3068 if (tdip
->i_sb
!= sdip
->i_sb
) {
3074 ZFS_VERIFY_ZP(tdzp
);
3075 if (zsb
->z_utf8
&& u8_validate(tnm
,
3076 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3081 if (flags
& FIGNORECASE
)
3090 * This is to prevent the creation of links into attribute space
3091 * by renaming a linked file into/outof an attribute directory.
3092 * See the comment in zfs_link() for why this is considered bad.
3094 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3100 * Lock source and target directory entries. To prevent deadlock,
3101 * a lock ordering must be defined. We lock the directory with
3102 * the smallest object id first, or if it's a tie, the one with
3103 * the lexically first name.
3105 if (sdzp
->z_id
< tdzp
->z_id
) {
3107 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3111 * First compare the two name arguments without
3112 * considering any case folding.
3114 int nofold
= (zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3116 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3117 ASSERT(error
== 0 || !zsb
->z_utf8
);
3120 * POSIX: "If the old argument and the new argument
3121 * both refer to links to the same existing file,
3122 * the rename() function shall return successfully
3123 * and perform no other action."
3129 * If the file system is case-folding, then we may
3130 * have some more checking to do. A case-folding file
3131 * system is either supporting mixed case sensitivity
3132 * access or is completely case-insensitive. Note
3133 * that the file system is always case preserving.
3135 * In mixed sensitivity mode case sensitive behavior
3136 * is the default. FIGNORECASE must be used to
3137 * explicitly request case insensitive behavior.
3139 * If the source and target names provided differ only
3140 * by case (e.g., a request to rename 'tim' to 'Tim'),
3141 * we will treat this as a special case in the
3142 * case-insensitive mode: as long as the source name
3143 * is an exact match, we will allow this to proceed as
3144 * a name-change request.
3146 if ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
||
3147 (zsb
->z_case
== ZFS_CASE_MIXED
&&
3148 flags
& FIGNORECASE
)) &&
3149 u8_strcmp(snm
, tnm
, 0, zsb
->z_norm
, U8_UNICODE_LATEST
,
3152 * case preserving rename request, require exact
3161 * If the source and destination directories are the same, we should
3162 * grab the z_name_lock of that directory only once.
3166 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3170 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3171 ZEXISTS
| zflg
, NULL
, NULL
);
3172 terr
= zfs_dirent_lock(&tdl
,
3173 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3175 terr
= zfs_dirent_lock(&tdl
,
3176 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3177 serr
= zfs_dirent_lock(&sdl
,
3178 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3184 * Source entry invalid or not there.
3187 zfs_dirent_unlock(tdl
);
3193 rw_exit(&sdzp
->z_name_lock
);
3195 if (strcmp(snm
, "..") == 0)
3201 zfs_dirent_unlock(sdl
);
3205 rw_exit(&sdzp
->z_name_lock
);
3207 if (strcmp(tnm
, "..") == 0)
3214 * Must have write access at the source to remove the old entry
3215 * and write access at the target to create the new entry.
3216 * Note that if target and source are the same, this can be
3217 * done in a single check.
3220 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3223 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3225 * Check to make sure rename is valid.
3226 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3228 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3233 * Does target exist?
3237 * Source and target must be the same type.
3239 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3240 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3245 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3251 * POSIX dictates that when the source and target
3252 * entries refer to the same file object, rename
3253 * must do nothing and exit without error.
3255 if (szp
->z_id
== tzp
->z_id
) {
3261 tx
= dmu_tx_create(zsb
->z_os
);
3262 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3263 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3264 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3265 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3267 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3268 zfs_sa_upgrade_txholds(tx
, tdzp
);
3271 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3272 zfs_sa_upgrade_txholds(tx
, tzp
);
3275 zfs_sa_upgrade_txholds(tx
, szp
);
3276 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
3277 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3280 zfs_rename_unlock(&zl
);
3281 zfs_dirent_unlock(sdl
);
3282 zfs_dirent_unlock(tdl
);
3285 rw_exit(&sdzp
->z_name_lock
);
3290 if (error
== ERESTART
) {
3300 if (tzp
) /* Attempt to remove the existing target */
3301 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3304 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3306 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3308 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zsb
),
3309 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3310 ASSERT3U(error
, ==, 0);
3312 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3314 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3315 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3316 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3319 * At this point, we have successfully created
3320 * the target name, but have failed to remove
3321 * the source name. Since the create was done
3322 * with the ZRENAMING flag, there are
3323 * complications; for one, the link count is
3324 * wrong. The easiest way to deal with this
3325 * is to remove the newly created target, and
3326 * return the original error. This must
3327 * succeed; fortunately, it is very unlikely to
3328 * fail, since we just created it.
3330 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3331 ZRENAMING
, NULL
), ==, 0);
3339 zfs_rename_unlock(&zl
);
3341 zfs_dirent_unlock(sdl
);
3342 zfs_dirent_unlock(tdl
);
3344 zfs_inode_update(sdzp
);
3346 rw_exit(&sdzp
->z_name_lock
);
3349 zfs_inode_update(tdzp
);
3351 zfs_inode_update(szp
);
3354 zfs_inode_update(tzp
);
3358 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3359 zil_commit(zilog
, 0);
3364 EXPORT_SYMBOL(zfs_rename
);
3367 * Insert the indicated symbolic reference entry into the directory.
3369 * IN: dip - Directory to contain new symbolic link.
3370 * link - Name for new symlink entry.
3371 * vap - Attributes of new entry.
3372 * target - Target path of new symlink.
3374 * cr - credentials of caller.
3375 * flags - case flags
3377 * RETURN: 0 if success
3378 * error code if failure
3381 * dip - ctime|mtime updated
3385 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3386 struct inode
**ipp
, cred_t
*cr
, int flags
)
3388 znode_t
*zp
, *dzp
= ITOZ(dip
);
3391 zfs_sb_t
*zsb
= ITOZSB(dip
);
3393 uint64_t len
= strlen(link
);
3396 zfs_acl_ids_t acl_ids
;
3397 boolean_t fuid_dirtied
;
3398 uint64_t txtype
= TX_SYMLINK
;
3400 ASSERT(S_ISLNK(vap
->va_mode
));
3406 if (zsb
->z_utf8
&& u8_validate(name
, strlen(name
),
3407 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3411 if (flags
& FIGNORECASE
)
3414 if (len
> MAXPATHLEN
) {
3416 return (ENAMETOOLONG
);
3419 if ((error
= zfs_acl_ids_create(dzp
, 0,
3420 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3428 * Attempt to lock directory; fail if entry already exists.
3430 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3432 zfs_acl_ids_free(&acl_ids
);
3437 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3438 zfs_acl_ids_free(&acl_ids
);
3439 zfs_dirent_unlock(dl
);
3444 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
3445 zfs_acl_ids_free(&acl_ids
);
3446 zfs_dirent_unlock(dl
);
3450 tx
= dmu_tx_create(zsb
->z_os
);
3451 fuid_dirtied
= zsb
->z_fuid_dirty
;
3452 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3453 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3454 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3455 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3456 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3457 if (!zsb
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3458 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3459 acl_ids
.z_aclp
->z_acl_bytes
);
3462 zfs_fuid_txhold(zsb
, tx
);
3463 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3465 zfs_dirent_unlock(dl
);
3466 if (error
== ERESTART
) {
3471 zfs_acl_ids_free(&acl_ids
);
3478 * Create a new object for the symlink.
3479 * for version 4 ZPL datsets the symlink will be an SA attribute
3481 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3484 zfs_fuid_sync(zsb
, tx
);
3486 mutex_enter(&zp
->z_lock
);
3488 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zsb
),
3491 zfs_sa_symlink(zp
, link
, len
, tx
);
3492 mutex_exit(&zp
->z_lock
);
3495 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zsb
),
3496 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3498 * Insert the new object into the directory.
3500 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3502 if (flags
& FIGNORECASE
)
3504 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3506 zfs_inode_update(dzp
);
3507 zfs_inode_update(zp
);
3509 zfs_acl_ids_free(&acl_ids
);
3513 zfs_dirent_unlock(dl
);
3517 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3518 zil_commit(zilog
, 0);
3523 EXPORT_SYMBOL(zfs_symlink
);
3526 * Return, in the buffer contained in the provided uio structure,
3527 * the symbolic path referred to by ip.
3529 * IN: ip - inode of symbolic link
3530 * uio - structure to contain the link path.
3531 * cr - credentials of caller.
3533 * RETURN: 0 if success
3534 * error code if failure
3537 * ip - atime updated
3541 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3543 znode_t
*zp
= ITOZ(ip
);
3544 zfs_sb_t
*zsb
= ITOZSB(ip
);
3550 mutex_enter(&zp
->z_lock
);
3552 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3553 SA_ZPL_SYMLINK(zsb
), uio
);
3555 error
= zfs_sa_readlink(zp
, uio
);
3556 mutex_exit(&zp
->z_lock
);
3558 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
3559 zfs_inode_update(zp
);
3563 EXPORT_SYMBOL(zfs_readlink
);
3566 * Insert a new entry into directory tdip referencing sip.
3568 * IN: tdip - Directory to contain new entry.
3569 * sip - inode of new entry.
3570 * name - name of new entry.
3571 * cr - credentials of caller.
3573 * RETURN: 0 if success
3574 * error code if failure
3577 * tdip - ctime|mtime updated
3578 * sip - ctime updated
3582 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
)
3584 znode_t
*dzp
= ITOZ(tdip
);
3586 zfs_sb_t
*zsb
= ITOZSB(tdip
);
3595 ASSERT(S_ISDIR(tdip
->i_mode
));
3602 * POSIX dictates that we return EPERM here.
3603 * Better choices include ENOTSUP or EISDIR.
3605 if (S_ISDIR(sip
->i_mode
)) {
3610 if (sip
->i_sb
!= tdip
->i_sb
) {
3618 /* Prevent links to .zfs/shares files */
3620 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
3621 &parent
, sizeof (uint64_t))) != 0) {
3625 if (parent
== zsb
->z_shares_dir
) {
3630 if (zsb
->z_utf8
&& u8_validate(name
,
3631 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3635 #ifdef HAVE_PN_UTILS
3636 if (flags
& FIGNORECASE
)
3638 #endif /* HAVE_PN_UTILS */
3641 * We do not support links between attributes and non-attributes
3642 * because of the potential security risk of creating links
3643 * into "normal" file space in order to circumvent restrictions
3644 * imposed in attribute space.
3646 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
3651 owner
= zfs_fuid_map_id(zsb
, szp
->z_uid
, cr
, ZFS_OWNER
);
3652 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
3657 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3664 * Attempt to lock directory; fail if entry already exists.
3666 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
3672 tx
= dmu_tx_create(zsb
->z_os
);
3673 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3674 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3675 zfs_sa_upgrade_txholds(tx
, szp
);
3676 zfs_sa_upgrade_txholds(tx
, dzp
);
3677 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3679 zfs_dirent_unlock(dl
);
3680 if (error
== ERESTART
) {
3690 error
= zfs_link_create(dl
, szp
, tx
, 0);
3693 uint64_t txtype
= TX_LINK
;
3694 #ifdef HAVE_PN_UTILS
3695 if (flags
& FIGNORECASE
)
3697 #endif /* HAVE_PN_UTILS */
3698 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
3703 zfs_dirent_unlock(dl
);
3705 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3706 zil_commit(zilog
, 0);
3708 zfs_inode_update(dzp
);
3709 zfs_inode_update(szp
);
3713 EXPORT_SYMBOL(zfs_link
);
3716 * Push a page out to disk
3718 * IN: vp - file to push page to.
3719 * pp - page to push.
3720 * off - start of range pushed.
3721 * len - len of range pushed.
3724 * RETURN: 0 if success
3725 * error code if failure
3727 * NOTE: callers must have locked the page to be pushed.
3731 zfs_putapage(struct inode
*ip
, struct page
*pp
, u_offset_t off
, size_t len
)
3733 znode_t
*zp
= ITOZ(ip
);
3734 zfs_sb_t
*zsb
= ITOZSB(ip
);
3740 * Can't push pages past end-of-file.
3742 if (off
>= zp
->z_size
) {
3743 /* ignore all pages */
3746 } else if (off
+ len
> zp
->z_size
)
3747 len
= zp
->z_size
- off
;
3749 if (zfs_owner_overquota(zsb
, zp
, B_FALSE
) ||
3750 zfs_owner_overquota(zsb
, zp
, B_TRUE
)) {
3755 tx
= dmu_tx_create(zsb
->z_os
);
3756 dmu_tx_hold_write(tx
, zp
->z_id
, off
, len
);
3758 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3759 zfs_sa_upgrade_txholds(tx
, zp
);
3760 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
3762 if (err
== ERESTART
) {
3772 ASSERT3U(len
, <=, PAGESIZE
);
3773 dmu_write(zsb
->z_os
, zp
->z_id
, off
, len
, va
, tx
);
3777 uint64_t mtime
[2], ctime
[2];
3778 sa_bulk_attr_t bulk
[3];
3781 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
3783 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
3785 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
3787 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
,
3789 zfs_log_write(zsb
->z_log
, tx
, TX_WRITE
, zp
, off
, len
, 0);
3798 * Copy the portion of the file indicated from page into the file.
3800 * IN: ip - inode of file to push page data to.
3801 * wbc - Unused parameter
3802 * data - pointer to address_space
3804 * RETURN: 0 if success
3805 * error code if failure
3808 * vp - ctime|mtime updated
3812 zfs_putpage(struct page
*page
, struct writeback_control
*wbc
, void *data
)
3814 struct address_space
*mapping
= data
;
3815 struct inode
*ip
= mapping
->host
;
3816 znode_t
*zp
= ITOZ(ip
);
3817 zfs_sb_t
*zsb
= ITOZSB(ip
);
3824 io_off
= page_offset(page
);
3830 rl
= zfs_range_lock(zp
, io_off
, io_len
, RL_WRITER
);
3832 if (io_off
> zp
->z_size
) {
3833 /* past end of file */
3834 zfs_range_unlock(rl
);
3839 len
= MIN(io_len
, P2ROUNDUP(zp
->z_size
, PAGESIZE
) - io_off
);
3841 error
= zfs_putapage(ip
, page
, io_off
, len
);
3842 zfs_range_unlock(rl
);
3844 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3845 zil_commit(zsb
->z_log
, zp
->z_id
);
3849 EXPORT_SYMBOL(zfs_putpage
);
3853 zfs_inactive(struct inode
*ip
)
3855 znode_t
*zp
= ITOZ(ip
);
3856 zfs_sb_t
*zsb
= ITOZSB(ip
);
3859 #ifdef HAVE_SNAPSHOT
3860 /* Early return for snapshot inode? */
3861 #endif /* HAVE_SNAPSHOT */
3863 rw_enter(&zsb
->z_teardown_inactive_lock
, RW_READER
);
3864 if (zp
->z_sa_hdl
== NULL
) {
3865 rw_exit(&zsb
->z_teardown_inactive_lock
);
3869 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
3870 dmu_tx_t
*tx
= dmu_tx_create(zsb
->z_os
);
3872 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3873 zfs_sa_upgrade_txholds(tx
, zp
);
3874 error
= dmu_tx_assign(tx
, TXG_WAIT
);
3878 mutex_enter(&zp
->z_lock
);
3879 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zsb
),
3880 (void *)&zp
->z_atime
, sizeof (zp
->z_atime
), tx
);
3881 zp
->z_atime_dirty
= 0;
3882 mutex_exit(&zp
->z_lock
);
3888 rw_exit(&zsb
->z_teardown_inactive_lock
);
3890 EXPORT_SYMBOL(zfs_inactive
);
3893 * Bounds-check the seek operation.
3895 * IN: ip - inode seeking within
3896 * ooff - old file offset
3897 * noffp - pointer to new file offset
3898 * ct - caller context
3900 * RETURN: 0 if success
3901 * EINVAL if new offset invalid
3905 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
3907 if (S_ISDIR(ip
->i_mode
))
3909 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
3911 EXPORT_SYMBOL(zfs_seek
);
3914 * Fill pages with data from the disk.
3917 zfs_fillpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
3919 znode_t
*zp
= ITOZ(ip
);
3920 zfs_sb_t
*zsb
= ITOZSB(ip
);
3922 struct page
*cur_pp
;
3923 u_offset_t io_off
, total
;
3930 io_len
= nr_pages
<< PAGE_CACHE_SHIFT
;
3931 i_size
= i_size_read(ip
);
3932 io_off
= page_offset(pl
[0]);
3934 if (io_off
+ io_len
> i_size
)
3935 io_len
= i_size
- io_off
;
3938 * Iterate over list of pages and read each page individually.
3942 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
3946 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
3950 /* convert checksum errors into IO errors */
3955 cur_pp
= pl
[++page_idx
];
3962 * Uses zfs_fillpage to read data from the file and fill the pages.
3964 * IN: ip - inode of file to get data from.
3965 * pl - list of pages to read
3966 * nr_pages - number of pages to read
3968 * RETURN: 0 if success
3969 * error code if failure
3972 * vp - atime updated
3976 zfs_getpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
3978 znode_t
*zp
= ITOZ(ip
);
3979 zfs_sb_t
*zsb
= ITOZSB(ip
);
3988 err
= zfs_fillpage(ip
, pl
, nr_pages
);
3991 ZFS_ACCESSTIME_STAMP(zsb
, zp
);
3996 EXPORT_SYMBOL(zfs_getpage
);
3999 * Check ZFS specific permissions to memory map a section of a file.
4001 * IN: ip - inode of the file to mmap
4003 * addrp - start address in memory region
4004 * len - length of memory region
4005 * vm_flags- address flags
4007 * RETURN: 0 if success
4008 * error code if failure
4012 zfs_map(struct inode
*ip
, offset_t off
, caddr_t
*addrp
, size_t len
,
4013 unsigned long vm_flags
)
4015 znode_t
*zp
= ITOZ(ip
);
4016 zfs_sb_t
*zsb
= ITOZSB(ip
);
4021 if ((vm_flags
& VM_WRITE
) && (zp
->z_pflags
&
4022 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4027 if ((vm_flags
& (VM_READ
| VM_EXEC
)) &&
4028 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4033 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4041 EXPORT_SYMBOL(zfs_map
);
4044 * convoff - converts the given data (start, whence) to the
4048 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4053 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4054 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4058 switch (lckdat
->l_whence
) {
4060 lckdat
->l_start
+= offset
;
4063 lckdat
->l_start
+= vap
.va_size
;
4071 if (lckdat
->l_start
< 0)
4076 lckdat
->l_start
-= offset
;
4079 lckdat
->l_start
-= vap
.va_size
;
4087 lckdat
->l_whence
= (short)whence
;
4092 * Free or allocate space in a file. Currently, this function only
4093 * supports the `F_FREESP' command. However, this command is somewhat
4094 * misnamed, as its functionality includes the ability to allocate as
4095 * well as free space.
4097 * IN: ip - inode of file to free data in.
4098 * cmd - action to take (only F_FREESP supported).
4099 * bfp - section of file to free/alloc.
4100 * flag - current file open mode flags.
4101 * offset - current file offset.
4102 * cr - credentials of caller [UNUSED].
4104 * RETURN: 0 if success
4105 * error code if failure
4108 * ip - ctime|mtime updated
4112 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4113 offset_t offset
, cred_t
*cr
)
4115 znode_t
*zp
= ITOZ(ip
);
4116 zfs_sb_t
*zsb
= ITOZSB(ip
);
4123 if (cmd
!= F_FREESP
) {
4128 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4133 if (bfp
->l_len
< 0) {
4139 len
= bfp
->l_len
; /* 0 means from off to end of file */
4141 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4146 EXPORT_SYMBOL(zfs_space
);
4150 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4152 znode_t
*zp
= ITOZ(ip
);
4153 zfs_sb_t
*zsb
= ITOZSB(ip
);
4156 uint64_t object
= zp
->z_id
;
4163 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zsb
),
4164 &gen64
, sizeof (uint64_t))) != 0) {
4169 gen
= (uint32_t)gen64
;
4171 size
= (zsb
->z_parent
!= zsb
) ? LONG_FID_LEN
: SHORT_FID_LEN
;
4172 if (fidp
->fid_len
< size
) {
4173 fidp
->fid_len
= size
;
4178 zfid
= (zfid_short_t
*)fidp
;
4180 zfid
->zf_len
= size
;
4182 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4183 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4185 /* Must have a non-zero generation number to distinguish from .zfs */
4188 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4189 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4191 if (size
== LONG_FID_LEN
) {
4192 uint64_t objsetid
= dmu_objset_id(zsb
->z_os
);
4195 zlfid
= (zfid_long_t
*)fidp
;
4197 for (i
= 0; i
< sizeof (zlfid
->zf_setid
); i
++)
4198 zlfid
->zf_setid
[i
] = (uint8_t)(objsetid
>> (8 * i
));
4200 /* XXX - this should be the generation number for the objset */
4201 for (i
= 0; i
< sizeof (zlfid
->zf_setgen
); i
++)
4202 zlfid
->zf_setgen
[i
] = 0;
4208 EXPORT_SYMBOL(zfs_fid
);
4212 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4214 znode_t
*zp
= ITOZ(ip
);
4215 zfs_sb_t
*zsb
= ITOZSB(ip
);
4217 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4221 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4226 EXPORT_SYMBOL(zfs_getsecattr
);
4230 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4232 znode_t
*zp
= ITOZ(ip
);
4233 zfs_sb_t
*zsb
= ITOZSB(ip
);
4235 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4236 zilog_t
*zilog
= zsb
->z_log
;
4241 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4243 if (zsb
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4244 zil_commit(zilog
, 0);
4249 EXPORT_SYMBOL(zfs_setsecattr
);
4251 #ifdef HAVE_UIO_ZEROCOPY
4253 * Tunable, both must be a power of 2.
4255 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4256 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4257 * an arcbuf for a partial block read
4259 int zcr_blksz_min
= (1 << 10); /* 1K */
4260 int zcr_blksz_max
= (1 << 17); /* 128K */
4264 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4266 znode_t
*zp
= ITOZ(ip
);
4267 zfs_sb_t
*zsb
= ITOZSB(ip
);
4268 int max_blksz
= zsb
->z_max_blksz
;
4269 uio_t
*uio
= &xuio
->xu_uio
;
4270 ssize_t size
= uio
->uio_resid
;
4271 offset_t offset
= uio
->uio_loffset
;
4276 int preamble
, postamble
;
4278 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4286 * Loan out an arc_buf for write if write size is bigger than
4287 * max_blksz, and the file's block size is also max_blksz.
4290 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4295 * Caller requests buffers for write before knowing where the
4296 * write offset might be (e.g. NFS TCP write).
4301 preamble
= P2PHASE(offset
, blksz
);
4303 preamble
= blksz
- preamble
;
4308 postamble
= P2PHASE(size
, blksz
);
4311 fullblk
= size
/ blksz
;
4312 (void) dmu_xuio_init(xuio
,
4313 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4316 * Have to fix iov base/len for partial buffers. They
4317 * currently represent full arc_buf's.
4320 /* data begins in the middle of the arc_buf */
4321 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4324 (void) dmu_xuio_add(xuio
, abuf
,
4325 blksz
- preamble
, preamble
);
4328 for (i
= 0; i
< fullblk
; i
++) {
4329 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4332 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4336 /* data ends in the middle of the arc_buf */
4337 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4340 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4345 * Loan out an arc_buf for read if the read size is larger than
4346 * the current file block size. Block alignment is not
4347 * considered. Partial arc_buf will be loaned out for read.
4349 blksz
= zp
->z_blksz
;
4350 if (blksz
< zcr_blksz_min
)
4351 blksz
= zcr_blksz_min
;
4352 if (blksz
> zcr_blksz_max
)
4353 blksz
= zcr_blksz_max
;
4354 /* avoid potential complexity of dealing with it */
4355 if (blksz
> max_blksz
) {
4360 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4374 uio
->uio_extflg
= UIO_XUIO
;
4375 XUIO_XUZC_RW(xuio
) = ioflag
;
4382 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4386 int ioflag
= XUIO_XUZC_RW(xuio
);
4388 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4390 i
= dmu_xuio_cnt(xuio
);
4392 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4394 * if abuf == NULL, it must be a write buffer
4395 * that has been returned in zfs_write().
4398 dmu_return_arcbuf(abuf
);
4399 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4402 dmu_xuio_fini(xuio
);
4405 #endif /* HAVE_UIO_ZEROCOPY */
4407 #if defined(_KERNEL) && defined(HAVE_SPL)
4408 module_param(zfs_read_chunk_size
, long, 0644);
4409 MODULE_PARM_DESC(zfs_read_chunk_size
, "Bytes to read per chunk");