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]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
25 * Copyright (c) 2015 by Chunwei Chen. All rights reserved.
26 * Copyright 2017 Nexenta Systems, Inc.
29 /* Portions Copyright 2007 Jeremy Teo */
30 /* Portions Copyright 2010 Robert Milkowski */
33 #include <sys/types.h>
34 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/sysmacros.h>
38 #include <sys/resource.h>
40 #include <sys/vfs_opreg.h>
44 #include <sys/taskq.h>
46 #include <sys/vmsystm.h>
47 #include <sys/atomic.h>
49 #include <sys/pathname.h>
50 #include <sys/cmn_err.h>
51 #include <sys/errno.h>
52 #include <sys/unistd.h>
53 #include <sys/zfs_dir.h>
54 #include <sys/zfs_acl.h>
55 #include <sys/zfs_ioctl.h>
56 #include <sys/fs/zfs.h>
58 #include <sys/dmu_objset.h>
64 #include <sys/dirent.h>
65 #include <sys/policy.h>
66 #include <sys/sunddi.h>
69 #include "fs/fs_subr.h"
70 #include <sys/zfs_ctldir.h>
71 #include <sys/zfs_fuid.h>
72 #include <sys/zfs_sa.h>
73 #include <sys/zfs_vnops.h>
75 #include <sys/zfs_rlock.h>
76 #include <sys/extdirent.h>
77 #include <sys/kidmap.h>
85 * Each vnode op performs some logical unit of work. To do this, the ZPL must
86 * properly lock its in-core state, create a DMU transaction, do the work,
87 * record this work in the intent log (ZIL), commit the DMU transaction,
88 * and wait for the intent log to commit if it is a synchronous operation.
89 * Moreover, the vnode ops must work in both normal and log replay context.
90 * The ordering of events is important to avoid deadlocks and references
91 * to freed memory. The example below illustrates the following Big Rules:
93 * (1) A check must be made in each zfs thread for a mounted file system.
94 * This is done avoiding races using ZFS_ENTER(zfsvfs).
95 * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
96 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
97 * can return EIO from the calling function.
99 * (2) iput() should always be the last thing except for zil_commit()
100 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
101 * First, if it's the last reference, the vnode/znode
102 * can be freed, so the zp may point to freed memory. Second, the last
103 * reference will call zfs_zinactive(), which may induce a lot of work --
104 * pushing cached pages (which acquires range locks) and syncing out
105 * cached atime changes. Third, zfs_zinactive() may require a new tx,
106 * which could deadlock the system if you were already holding one.
107 * If you must call iput() within a tx then use zfs_iput_async().
109 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
110 * as they can span dmu_tx_assign() calls.
112 * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
113 * dmu_tx_assign(). This is critical because we don't want to block
114 * while holding locks.
116 * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
117 * reduces lock contention and CPU usage when we must wait (note that if
118 * throughput is constrained by the storage, nearly every transaction
121 * Note, in particular, that if a lock is sometimes acquired before
122 * the tx assigns, and sometimes after (e.g. z_lock), then failing
123 * to use a non-blocking assign can deadlock the system. The scenario:
125 * Thread A has grabbed a lock before calling dmu_tx_assign().
126 * Thread B is in an already-assigned tx, and blocks for this lock.
127 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
128 * forever, because the previous txg can't quiesce until B's tx commits.
130 * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT,
131 * then drop all locks, call dmu_tx_wait(), and try again. On subsequent
132 * calls to dmu_tx_assign(), pass TXG_WAITED rather than TXG_NOWAIT,
133 * to indicate that this operation has already called dmu_tx_wait().
134 * This will ensure that we don't retry forever, waiting a short bit
137 * (5) If the operation succeeded, generate the intent log entry for it
138 * before dropping locks. This ensures that the ordering of events
139 * in the intent log matches the order in which they actually occurred.
140 * During ZIL replay the zfs_log_* functions will update the sequence
141 * number to indicate the zil transaction has replayed.
143 * (6) At the end of each vnode op, the DMU tx must always commit,
144 * regardless of whether there were any errors.
146 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
147 * to ensure that synchronous semantics are provided when necessary.
149 * In general, this is how things should be ordered in each vnode op:
151 * ZFS_ENTER(zfsvfs); // exit if unmounted
153 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
154 * rw_enter(...); // grab any other locks you need
155 * tx = dmu_tx_create(...); // get DMU tx
156 * dmu_tx_hold_*(); // hold each object you might modify
157 * error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
159 * rw_exit(...); // drop locks
160 * zfs_dirent_unlock(dl); // unlock directory entry
161 * iput(...); // release held vnodes
162 * if (error == ERESTART) {
168 * dmu_tx_abort(tx); // abort DMU tx
169 * ZFS_EXIT(zfsvfs); // finished in zfs
170 * return (error); // really out of space
172 * error = do_real_work(); // do whatever this VOP does
174 * zfs_log_*(...); // on success, make ZIL entry
175 * dmu_tx_commit(tx); // commit DMU tx -- error or not
176 * rw_exit(...); // drop locks
177 * zfs_dirent_unlock(dl); // unlock directory entry
178 * iput(...); // release held vnodes
179 * zil_commit(zilog, foid); // synchronous when necessary
180 * ZFS_EXIT(zfsvfs); // finished in zfs
181 * return (error); // done, report error
185 * Virus scanning is unsupported. It would be possible to add a hook
186 * here to performance the required virus scan. This could be done
187 * entirely in the kernel or potentially as an update to invoke a
191 zfs_vscan(struct inode
*ip
, cred_t
*cr
, int async
)
198 zfs_open(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
200 znode_t
*zp
= ITOZ(ip
);
201 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
206 /* Honor ZFS_APPENDONLY file attribute */
207 if ((mode
& FMODE_WRITE
) && (zp
->z_pflags
& ZFS_APPENDONLY
) &&
208 ((flag
& O_APPEND
) == 0)) {
210 return (SET_ERROR(EPERM
));
213 /* Virus scan eligible files on open */
214 if (!zfs_has_ctldir(zp
) && zfsvfs
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
215 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0) {
216 if (zfs_vscan(ip
, cr
, 0) != 0) {
218 return (SET_ERROR(EACCES
));
222 /* Keep a count of the synchronous opens in the znode */
224 atomic_inc_32(&zp
->z_sync_cnt
);
229 EXPORT_SYMBOL(zfs_open
);
233 zfs_close(struct inode
*ip
, int flag
, cred_t
*cr
)
235 znode_t
*zp
= ITOZ(ip
);
236 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
241 /* Decrement the synchronous opens in the znode */
243 atomic_dec_32(&zp
->z_sync_cnt
);
245 if (!zfs_has_ctldir(zp
) && zfsvfs
->z_vscan
&& S_ISREG(ip
->i_mode
) &&
246 !(zp
->z_pflags
& ZFS_AV_QUARANTINED
) && zp
->z_size
> 0)
247 VERIFY(zfs_vscan(ip
, cr
, 1) == 0);
252 EXPORT_SYMBOL(zfs_close
);
254 #if defined(SEEK_HOLE) && defined(SEEK_DATA)
256 * Lseek support for finding holes (cmd == SEEK_HOLE) and
257 * data (cmd == SEEK_DATA). "off" is an in/out parameter.
260 zfs_holey_common(struct inode
*ip
, int cmd
, loff_t
*off
)
262 znode_t
*zp
= ITOZ(ip
);
263 uint64_t noff
= (uint64_t)*off
; /* new offset */
268 file_sz
= zp
->z_size
;
269 if (noff
>= file_sz
) {
270 return (SET_ERROR(ENXIO
));
273 if (cmd
== SEEK_HOLE
)
278 error
= dmu_offset_next(ZTOZSB(zp
)->z_os
, zp
->z_id
, hole
, &noff
);
281 return (SET_ERROR(ENXIO
));
284 * We could find a hole that begins after the logical end-of-file,
285 * because dmu_offset_next() only works on whole blocks. If the
286 * EOF falls mid-block, then indicate that the "virtual hole"
287 * at the end of the file begins at the logical EOF, rather than
288 * at the end of the last block.
290 if (noff
> file_sz
) {
302 zfs_holey(struct inode
*ip
, int cmd
, loff_t
*off
)
304 znode_t
*zp
= ITOZ(ip
);
305 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
311 error
= zfs_holey_common(ip
, cmd
, off
);
316 EXPORT_SYMBOL(zfs_holey
);
317 #endif /* SEEK_HOLE && SEEK_DATA */
321 * When a file is memory mapped, we must keep the IO data synchronized
322 * between the DMU cache and the memory mapped pages. What this means:
324 * On Write: If we find a memory mapped page, we write to *both*
325 * the page and the dmu buffer.
328 update_pages(struct inode
*ip
, int64_t start
, int len
,
329 objset_t
*os
, uint64_t oid
)
331 struct address_space
*mp
= ip
->i_mapping
;
337 off
= start
& (PAGE_SIZE
-1);
338 for (start
&= PAGE_MASK
; len
> 0; start
+= PAGE_SIZE
) {
339 nbytes
= MIN(PAGE_SIZE
- off
, len
);
341 pp
= find_lock_page(mp
, start
>> PAGE_SHIFT
);
343 if (mapping_writably_mapped(mp
))
344 flush_dcache_page(pp
);
347 (void) dmu_read(os
, oid
, start
+off
, nbytes
, pb
+off
,
351 if (mapping_writably_mapped(mp
))
352 flush_dcache_page(pp
);
354 mark_page_accessed(pp
);
367 * When a file is memory mapped, we must keep the IO data synchronized
368 * between the DMU cache and the memory mapped pages. What this means:
370 * On Read: We "read" preferentially from memory mapped pages,
371 * else we default from the dmu buffer.
373 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
374 * the file is memory mapped.
377 mappedread(struct inode
*ip
, int nbytes
, uio_t
*uio
)
379 struct address_space
*mp
= ip
->i_mapping
;
381 znode_t
*zp
= ITOZ(ip
);
388 start
= uio
->uio_loffset
;
389 off
= start
& (PAGE_SIZE
-1);
390 for (start
&= PAGE_MASK
; len
> 0; start
+= PAGE_SIZE
) {
391 bytes
= MIN(PAGE_SIZE
- off
, len
);
393 pp
= find_lock_page(mp
, start
>> PAGE_SHIFT
);
395 ASSERT(PageUptodate(pp
));
398 error
= uiomove(pb
+ off
, bytes
, UIO_READ
, uio
);
401 if (mapping_writably_mapped(mp
))
402 flush_dcache_page(pp
);
404 mark_page_accessed(pp
);
408 error
= dmu_read_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
421 unsigned long zfs_read_chunk_size
= 1024 * 1024; /* Tunable */
422 unsigned long zfs_delete_blocks
= DMU_MAX_DELETEBLKCNT
;
425 * Read bytes from specified file into supplied buffer.
427 * IN: ip - inode of file to be read from.
428 * uio - structure supplying read location, range info,
430 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
431 * O_DIRECT flag; used to bypass page cache.
432 * cr - credentials of caller.
434 * OUT: uio - updated offset and range, buffer filled.
436 * RETURN: 0 on success, error code on failure.
439 * inode - atime updated if byte count > 0
443 zfs_read(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
445 znode_t
*zp
= ITOZ(ip
);
446 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
450 #ifdef HAVE_UIO_ZEROCOPY
452 #endif /* HAVE_UIO_ZEROCOPY */
457 if (zp
->z_pflags
& ZFS_AV_QUARANTINED
) {
459 return (SET_ERROR(EACCES
));
463 * Validate file offset
465 if (uio
->uio_loffset
< (offset_t
)0) {
467 return (SET_ERROR(EINVAL
));
471 * Fasttrack empty reads
473 if (uio
->uio_resid
== 0) {
479 * If we're in FRSYNC mode, sync out this znode before reading it.
481 if (ioflag
& FRSYNC
|| zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
482 zil_commit(zfsvfs
->z_log
, zp
->z_id
);
485 * Lock the range against changes.
487 rl
= zfs_range_lock(&zp
->z_range_lock
, uio
->uio_loffset
, uio
->uio_resid
,
491 * If we are reading past end-of-file we can skip
492 * to the end; but we might still need to set atime.
494 if (uio
->uio_loffset
>= zp
->z_size
) {
499 ASSERT(uio
->uio_loffset
< zp
->z_size
);
500 n
= MIN(uio
->uio_resid
, zp
->z_size
- uio
->uio_loffset
);
502 #ifdef HAVE_UIO_ZEROCOPY
503 if ((uio
->uio_extflg
== UIO_XUIO
) &&
504 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
)) {
506 int blksz
= zp
->z_blksz
;
507 uint64_t offset
= uio
->uio_loffset
;
509 xuio
= (xuio_t
*)uio
;
511 nblk
= (P2ROUNDUP(offset
+ n
, blksz
) - P2ALIGN(offset
,
514 ASSERT(offset
+ n
<= blksz
);
517 (void) dmu_xuio_init(xuio
, nblk
);
519 if (vn_has_cached_data(ip
)) {
521 * For simplicity, we always allocate a full buffer
522 * even if we only expect to read a portion of a block.
524 while (--nblk
>= 0) {
525 (void) dmu_xuio_add(xuio
,
526 dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
531 #endif /* HAVE_UIO_ZEROCOPY */
534 nbytes
= MIN(n
, zfs_read_chunk_size
-
535 P2PHASE(uio
->uio_loffset
, zfs_read_chunk_size
));
537 if (zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
)) {
538 error
= mappedread(ip
, nbytes
, uio
);
540 error
= dmu_read_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
545 /* convert checksum errors into IO errors */
547 error
= SET_ERROR(EIO
);
554 zfs_range_unlock(rl
);
559 EXPORT_SYMBOL(zfs_read
);
562 * Write the bytes to a file.
564 * IN: ip - inode of file to be written to.
565 * uio - structure supplying write location, range info,
567 * ioflag - FAPPEND flag set if in append mode.
568 * O_DIRECT flag; used to bypass page cache.
569 * cr - credentials of caller.
571 * OUT: uio - updated offset and range.
573 * RETURN: 0 if success
574 * error code if failure
577 * ip - ctime|mtime updated if byte count > 0
582 zfs_write(struct inode
*ip
, uio_t
*uio
, int ioflag
, cred_t
*cr
)
584 znode_t
*zp
= ITOZ(ip
);
585 rlim64_t limit
= uio
->uio_limit
;
586 ssize_t start_resid
= uio
->uio_resid
;
590 zfsvfs_t
*zfsvfs
= ZTOZSB(zp
);
595 int max_blksz
= zfsvfs
->z_max_blksz
;
598 const iovec_t
*aiov
= NULL
;
602 sa_bulk_attr_t bulk
[4];
603 uint64_t mtime
[2], ctime
[2];
605 #ifdef HAVE_UIO_ZEROCOPY
607 const iovec_t
*iovp
= uio
->uio_iov
;
608 ASSERTV(int iovcnt
= uio
->uio_iovcnt
);
612 * Fasttrack empty write
618 if (limit
== RLIM64_INFINITY
|| limit
> MAXOFFSET_T
)
624 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zfsvfs
), NULL
, &mtime
, 16);
625 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
), NULL
, &ctime
, 16);
626 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zfsvfs
), NULL
,
628 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zfsvfs
), NULL
,
632 * Callers might not be able to detect properly that we are read-only,
633 * so check it explicitly here.
635 if (zfs_is_readonly(zfsvfs
)) {
637 return (SET_ERROR(EROFS
));
641 * If immutable or not appending then return EPERM
643 if ((zp
->z_pflags
& (ZFS_IMMUTABLE
| ZFS_READONLY
)) ||
644 ((zp
->z_pflags
& ZFS_APPENDONLY
) && !(ioflag
& FAPPEND
) &&
645 (uio
->uio_loffset
< zp
->z_size
))) {
647 return (SET_ERROR(EPERM
));
650 zilog
= zfsvfs
->z_log
;
653 * Validate file offset
655 woff
= ioflag
& FAPPEND
? zp
->z_size
: uio
->uio_loffset
;
658 return (SET_ERROR(EINVAL
));
662 * Pre-fault the pages to ensure slow (eg NFS) pages
664 * Skip this if uio contains loaned arc_buf.
666 #ifdef HAVE_UIO_ZEROCOPY
667 if ((uio
->uio_extflg
== UIO_XUIO
) &&
668 (((xuio_t
*)uio
)->xu_type
== UIOTYPE_ZEROCOPY
))
669 xuio
= (xuio_t
*)uio
;
672 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
675 * If in append mode, set the io offset pointer to eof.
677 if (ioflag
& FAPPEND
) {
679 * Obtain an appending range lock to guarantee file append
680 * semantics. We reset the write offset once we have the lock.
682 rl
= zfs_range_lock(&zp
->z_range_lock
, 0, n
, RL_APPEND
);
684 if (rl
->r_len
== UINT64_MAX
) {
686 * We overlocked the file because this write will cause
687 * the file block size to increase.
688 * Note that zp_size cannot change with this lock held.
692 uio
->uio_loffset
= woff
;
695 * Note that if the file block size will change as a result of
696 * this write, then this range lock will lock the entire file
697 * so that we can re-write the block safely.
699 rl
= zfs_range_lock(&zp
->z_range_lock
, woff
, n
, RL_WRITER
);
703 zfs_range_unlock(rl
);
705 return (SET_ERROR(EFBIG
));
708 if ((woff
+ n
) > limit
|| woff
> (limit
- n
))
711 /* Will this write extend the file length? */
712 write_eof
= (woff
+ n
> zp
->z_size
);
714 end_size
= MAX(zp
->z_size
, woff
+ n
);
717 * Write the file in reasonable size chunks. Each chunk is written
718 * in a separate transaction; this keeps the intent log records small
719 * and allows us to do more fine-grained space accounting.
723 woff
= uio
->uio_loffset
;
724 if (zfs_owner_overquota(zfsvfs
, zp
, B_FALSE
) ||
725 zfs_owner_overquota(zfsvfs
, zp
, B_TRUE
)) {
727 dmu_return_arcbuf(abuf
);
728 error
= SET_ERROR(EDQUOT
);
732 if (xuio
&& abuf
== NULL
) {
733 #ifdef HAVE_UIO_ZEROCOPY
734 ASSERT(i_iov
< iovcnt
);
735 ASSERT3U(uio
->uio_segflg
, !=, UIO_BVEC
);
737 abuf
= dmu_xuio_arcbuf(xuio
, i_iov
);
738 dmu_xuio_clear(xuio
, i_iov
);
739 ASSERT((aiov
->iov_base
== abuf
->b_data
) ||
740 ((char *)aiov
->iov_base
- (char *)abuf
->b_data
+
741 aiov
->iov_len
== arc_buf_size(abuf
)));
744 } else if (abuf
== NULL
&& n
>= max_blksz
&&
745 woff
>= zp
->z_size
&&
746 P2PHASE(woff
, max_blksz
) == 0 &&
747 zp
->z_blksz
== max_blksz
) {
749 * This write covers a full block. "Borrow" a buffer
750 * from the dmu so that we can fill it before we enter
751 * a transaction. This avoids the possibility of
752 * holding up the transaction if the data copy hangs
753 * up on a pagefault (e.g., from an NFS server mapping).
757 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
759 ASSERT(abuf
!= NULL
);
760 ASSERT(arc_buf_size(abuf
) == max_blksz
);
761 if ((error
= uiocopy(abuf
->b_data
, max_blksz
,
762 UIO_WRITE
, uio
, &cbytes
))) {
763 dmu_return_arcbuf(abuf
);
766 ASSERT(cbytes
== max_blksz
);
770 * Start a transaction.
772 tx
= dmu_tx_create(zfsvfs
->z_os
);
773 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
774 dmu_tx_hold_write(tx
, zp
->z_id
, woff
, MIN(n
, max_blksz
));
775 zfs_sa_upgrade_txholds(tx
, zp
);
776 error
= dmu_tx_assign(tx
, TXG_WAIT
);
780 dmu_return_arcbuf(abuf
);
785 * If zfs_range_lock() over-locked we grow the blocksize
786 * and then reduce the lock range. This will only happen
787 * on the first iteration since zfs_range_reduce() will
788 * shrink down r_len to the appropriate size.
790 if (rl
->r_len
== UINT64_MAX
) {
793 if (zp
->z_blksz
> max_blksz
) {
795 * File's blocksize is already larger than the
796 * "recordsize" property. Only let it grow to
797 * the next power of 2.
799 ASSERT(!ISP2(zp
->z_blksz
));
800 new_blksz
= MIN(end_size
,
801 1 << highbit64(zp
->z_blksz
));
803 new_blksz
= MIN(end_size
, max_blksz
);
805 zfs_grow_blocksize(zp
, new_blksz
, tx
);
806 zfs_range_reduce(rl
, woff
, n
);
810 * XXX - should we really limit each write to z_max_blksz?
811 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
813 nbytes
= MIN(n
, max_blksz
- P2PHASE(woff
, max_blksz
));
816 tx_bytes
= uio
->uio_resid
;
817 error
= dmu_write_uio_dbuf(sa_get_db(zp
->z_sa_hdl
),
819 tx_bytes
-= uio
->uio_resid
;
822 ASSERT(xuio
== NULL
|| tx_bytes
== aiov
->iov_len
);
824 * If this is not a full block write, but we are
825 * extending the file past EOF and this data starts
826 * block-aligned, use assign_arcbuf(). Otherwise,
827 * write via dmu_write().
829 if (tx_bytes
< max_blksz
&& (!write_eof
||
830 aiov
->iov_base
!= abuf
->b_data
)) {
832 dmu_write(zfsvfs
->z_os
, zp
->z_id
, woff
,
833 // cppcheck-suppress nullPointer
834 aiov
->iov_len
, aiov
->iov_base
, tx
);
835 dmu_return_arcbuf(abuf
);
836 xuio_stat_wbuf_copied();
838 ASSERT(xuio
|| tx_bytes
== max_blksz
);
839 dmu_assign_arcbuf(sa_get_db(zp
->z_sa_hdl
),
842 ASSERT(tx_bytes
<= uio
->uio_resid
);
843 uioskip(uio
, tx_bytes
);
845 if (tx_bytes
&& zp
->z_is_mapped
&& !(ioflag
& O_DIRECT
)) {
846 update_pages(ip
, woff
,
847 tx_bytes
, zfsvfs
->z_os
, zp
->z_id
);
851 * If we made no progress, we're done. If we made even
852 * partial progress, update the znode and ZIL accordingly.
855 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zfsvfs
),
856 (void *)&zp
->z_size
, sizeof (uint64_t), tx
);
863 * Clear Set-UID/Set-GID bits on successful write if not
864 * privileged and at least one of the execute bits is set.
866 * It would be nice to to this after all writes have
867 * been done, but that would still expose the ISUID/ISGID
868 * to another app after the partial write is committed.
870 * Note: we don't call zfs_fuid_map_id() here because
871 * user 0 is not an ephemeral uid.
873 mutex_enter(&zp
->z_acl_lock
);
874 uid
= KUID_TO_SUID(ip
->i_uid
);
875 if ((zp
->z_mode
& (S_IXUSR
| (S_IXUSR
>> 3) |
876 (S_IXUSR
>> 6))) != 0 &&
877 (zp
->z_mode
& (S_ISUID
| S_ISGID
)) != 0 &&
878 secpolicy_vnode_setid_retain(cr
,
879 ((zp
->z_mode
& S_ISUID
) != 0 && uid
== 0)) != 0) {
881 zp
->z_mode
&= ~(S_ISUID
| S_ISGID
);
882 ip
->i_mode
= newmode
= zp
->z_mode
;
883 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_MODE(zfsvfs
),
884 (void *)&newmode
, sizeof (uint64_t), tx
);
886 mutex_exit(&zp
->z_acl_lock
);
888 zfs_tstamp_update_setup(zp
, CONTENT_MODIFIED
, mtime
, ctime
);
891 * Update the file size (zp_size) if it has changed;
892 * account for possible concurrent updates.
894 while ((end_size
= zp
->z_size
) < uio
->uio_loffset
) {
895 (void) atomic_cas_64(&zp
->z_size
, end_size
,
900 * If we are replaying and eof is non zero then force
901 * the file size to the specified eof. Note, there's no
902 * concurrency during replay.
904 if (zfsvfs
->z_replay
&& zfsvfs
->z_replay_eof
!= 0)
905 zp
->z_size
= zfsvfs
->z_replay_eof
;
907 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
909 zfs_log_write(zilog
, tx
, TX_WRITE
, zp
, woff
, tx_bytes
, ioflag
,
915 ASSERT(tx_bytes
== nbytes
);
919 uio_prefaultpages(MIN(n
, max_blksz
), uio
);
922 zfs_inode_update(zp
);
923 zfs_range_unlock(rl
);
926 * If we're in replay mode, or we made no progress, return error.
927 * Otherwise, it's at least a partial write, so it's successful.
929 if (zfsvfs
->z_replay
|| uio
->uio_resid
== start_resid
) {
934 if (ioflag
& (FSYNC
| FDSYNC
) ||
935 zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
936 zil_commit(zilog
, zp
->z_id
);
941 EXPORT_SYMBOL(zfs_write
);
944 * Drop a reference on the passed inode asynchronously. This ensures
945 * that the caller will never drop the last reference on an inode in
946 * the current context. Doing so while holding open a tx could result
947 * in a deadlock if iput_final() re-enters the filesystem code.
950 zfs_iput_async(struct inode
*ip
)
952 objset_t
*os
= ITOZSB(ip
)->z_os
;
954 ASSERT(atomic_read(&ip
->i_count
) > 0);
957 if (atomic_read(&ip
->i_count
) == 1)
958 VERIFY(taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os
)),
959 (task_func_t
*)iput
, ip
, TQ_SLEEP
) != TASKQID_INVALID
);
965 zfs_get_done(zgd_t
*zgd
, int error
)
967 znode_t
*zp
= zgd
->zgd_private
;
970 dmu_buf_rele(zgd
->zgd_db
, zgd
);
972 zfs_range_unlock(zgd
->zgd_rl
);
975 * Release the vnode asynchronously as we currently have the
976 * txg stopped from syncing.
978 zfs_iput_async(ZTOI(zp
));
980 if (error
== 0 && zgd
->zgd_bp
)
981 zil_add_block(zgd
->zgd_zilog
, zgd
->zgd_bp
);
983 kmem_free(zgd
, sizeof (zgd_t
));
987 static int zil_fault_io
= 0;
991 * Get data to generate a TX_WRITE intent log record.
994 zfs_get_data(void *arg
, lr_write_t
*lr
, char *buf
, zio_t
*zio
)
996 zfsvfs_t
*zfsvfs
= arg
;
997 objset_t
*os
= zfsvfs
->z_os
;
999 uint64_t object
= lr
->lr_foid
;
1000 uint64_t offset
= lr
->lr_offset
;
1001 uint64_t size
= lr
->lr_length
;
1002 blkptr_t
*bp
= &lr
->lr_blkptr
;
1007 ASSERT(zio
!= NULL
);
1011 * Nothing to do if the file has been removed
1013 if (zfs_zget(zfsvfs
, object
, &zp
) != 0)
1014 return (SET_ERROR(ENOENT
));
1015 if (zp
->z_unlinked
) {
1017 * Release the vnode asynchronously as we currently have the
1018 * txg stopped from syncing.
1020 zfs_iput_async(ZTOI(zp
));
1021 return (SET_ERROR(ENOENT
));
1024 zgd
= (zgd_t
*)kmem_zalloc(sizeof (zgd_t
), KM_SLEEP
);
1025 zgd
->zgd_zilog
= zfsvfs
->z_log
;
1026 zgd
->zgd_private
= zp
;
1029 * Write records come in two flavors: immediate and indirect.
1030 * For small writes it's cheaper to store the data with the
1031 * log record (immediate); for large writes it's cheaper to
1032 * sync the data and get a pointer to it (indirect) so that
1033 * we don't have to write the data twice.
1035 if (buf
!= NULL
) { /* immediate write */
1036 zgd
->zgd_rl
= zfs_range_lock(&zp
->z_range_lock
, offset
, size
,
1038 /* test for truncation needs to be done while range locked */
1039 if (offset
>= zp
->z_size
) {
1040 error
= SET_ERROR(ENOENT
);
1042 error
= dmu_read(os
, object
, offset
, size
, buf
,
1043 DMU_READ_NO_PREFETCH
);
1045 ASSERT(error
== 0 || error
== ENOENT
);
1046 } else { /* indirect write */
1048 * Have to lock the whole block to ensure when it's
1049 * written out and it's checksum is being calculated
1050 * that no one can change the data. We need to re-check
1051 * blocksize after we get the lock in case it's changed!
1056 blkoff
= ISP2(size
) ? P2PHASE(offset
, size
) : offset
;
1058 zgd
->zgd_rl
= zfs_range_lock(&zp
->z_range_lock
, offset
,
1060 if (zp
->z_blksz
== size
)
1063 zfs_range_unlock(zgd
->zgd_rl
);
1065 /* test for truncation needs to be done while range locked */
1066 if (lr
->lr_offset
>= zp
->z_size
)
1067 error
= SET_ERROR(ENOENT
);
1070 error
= SET_ERROR(EIO
);
1075 error
= dmu_buf_hold(os
, object
, offset
, zgd
, &db
,
1076 DMU_READ_NO_PREFETCH
);
1079 blkptr_t
*obp
= dmu_buf_get_blkptr(db
);
1081 ASSERT(BP_IS_HOLE(bp
));
1088 ASSERT(db
->db_offset
== offset
);
1089 ASSERT(db
->db_size
== size
);
1091 error
= dmu_sync(zio
, lr
->lr_common
.lrc_txg
,
1093 ASSERT(error
|| lr
->lr_length
<= size
);
1096 * On success, we need to wait for the write I/O
1097 * initiated by dmu_sync() to complete before we can
1098 * release this dbuf. We will finish everything up
1099 * in the zfs_get_done() callback.
1104 if (error
== EALREADY
) {
1105 lr
->lr_common
.lrc_txtype
= TX_WRITE2
;
1111 zfs_get_done(zgd
, error
);
1118 zfs_access(struct inode
*ip
, int mode
, int flag
, cred_t
*cr
)
1120 znode_t
*zp
= ITOZ(ip
);
1121 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
1127 if (flag
& V_ACE_MASK
)
1128 error
= zfs_zaccess(zp
, mode
, flag
, B_FALSE
, cr
);
1130 error
= zfs_zaccess_rwx(zp
, mode
, flag
, cr
);
1135 EXPORT_SYMBOL(zfs_access
);
1138 * Lookup an entry in a directory, or an extended attribute directory.
1139 * If it exists, return a held inode reference for it.
1141 * IN: dip - inode of directory to search.
1142 * nm - name of entry to lookup.
1143 * flags - LOOKUP_XATTR set if looking for an attribute.
1144 * cr - credentials of caller.
1145 * direntflags - directory lookup flags
1146 * realpnp - returned pathname.
1148 * OUT: ipp - inode of located entry, NULL if not found.
1150 * RETURN: 0 on success, error code on failure.
1157 zfs_lookup(struct inode
*dip
, char *nm
, struct inode
**ipp
, int flags
,
1158 cred_t
*cr
, int *direntflags
, pathname_t
*realpnp
)
1160 znode_t
*zdp
= ITOZ(dip
);
1161 zfsvfs_t
*zfsvfs
= ITOZSB(dip
);
1165 * Fast path lookup, however we must skip DNLC lookup
1166 * for case folding or normalizing lookups because the
1167 * DNLC code only stores the passed in name. This means
1168 * creating 'a' and removing 'A' on a case insensitive
1169 * file system would work, but DNLC still thinks 'a'
1170 * exists and won't let you create it again on the next
1171 * pass through fast path.
1173 if (!(flags
& (LOOKUP_XATTR
| FIGNORECASE
))) {
1175 if (!S_ISDIR(dip
->i_mode
)) {
1176 return (SET_ERROR(ENOTDIR
));
1177 } else if (zdp
->z_sa_hdl
== NULL
) {
1178 return (SET_ERROR(EIO
));
1181 if (nm
[0] == 0 || (nm
[0] == '.' && nm
[1] == '\0')) {
1182 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1190 } else if (!zdp
->z_zfsvfs
->z_norm
&&
1191 (zdp
->z_zfsvfs
->z_case
== ZFS_CASE_SENSITIVE
)) {
1193 vnode_t
*tvp
= dnlc_lookup(dvp
, nm
);
1196 error
= zfs_fastaccesschk_execute(zdp
, cr
);
1201 if (tvp
== DNLC_NO_VNODE
) {
1203 return (SET_ERROR(ENOENT
));
1206 return (specvp_check(vpp
, cr
));
1209 #endif /* HAVE_DNLC */
1218 if (flags
& LOOKUP_XATTR
) {
1220 * We don't allow recursive attributes..
1221 * Maybe someday we will.
1223 if (zdp
->z_pflags
& ZFS_XATTR
) {
1225 return (SET_ERROR(EINVAL
));
1228 if ((error
= zfs_get_xattrdir(zdp
, ipp
, cr
, flags
))) {
1234 * Do we have permission to get into attribute directory?
1237 if ((error
= zfs_zaccess(ITOZ(*ipp
), ACE_EXECUTE
, 0,
1247 if (!S_ISDIR(dip
->i_mode
)) {
1249 return (SET_ERROR(ENOTDIR
));
1253 * Check accessibility of directory.
1256 if ((error
= zfs_zaccess(zdp
, ACE_EXECUTE
, 0, B_FALSE
, cr
))) {
1261 if (zfsvfs
->z_utf8
&& u8_validate(nm
, strlen(nm
),
1262 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1264 return (SET_ERROR(EILSEQ
));
1267 error
= zfs_dirlook(zdp
, nm
, ipp
, flags
, direntflags
, realpnp
);
1268 if ((error
== 0) && (*ipp
))
1269 zfs_inode_update(ITOZ(*ipp
));
1274 EXPORT_SYMBOL(zfs_lookup
);
1277 * Attempt to create a new entry in a directory. If the entry
1278 * already exists, truncate the file if permissible, else return
1279 * an error. Return the ip of the created or trunc'd file.
1281 * IN: dip - inode of directory to put new file entry in.
1282 * name - name of new file entry.
1283 * vap - attributes of new file.
1284 * excl - flag indicating exclusive or non-exclusive mode.
1285 * mode - mode to open file with.
1286 * cr - credentials of caller.
1287 * flag - large file flag [UNUSED].
1288 * vsecp - ACL to be set
1290 * OUT: ipp - inode of created or trunc'd entry.
1292 * RETURN: 0 on success, error code on failure.
1295 * dip - ctime|mtime updated if new entry created
1296 * ip - ctime|mtime always, atime if new
1301 zfs_create(struct inode
*dip
, char *name
, vattr_t
*vap
, int excl
,
1302 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1304 znode_t
*zp
, *dzp
= ITOZ(dip
);
1305 zfsvfs_t
*zfsvfs
= ITOZSB(dip
);
1313 zfs_acl_ids_t acl_ids
;
1314 boolean_t fuid_dirtied
;
1315 boolean_t have_acl
= B_FALSE
;
1316 boolean_t waited
= B_FALSE
;
1319 * If we have an ephemeral id, ACL, or XVATTR then
1320 * make sure file system is at proper version
1326 if (zfsvfs
->z_use_fuids
== B_FALSE
&&
1327 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1328 return (SET_ERROR(EINVAL
));
1331 return (SET_ERROR(EINVAL
));
1336 zilog
= zfsvfs
->z_log
;
1338 if (zfsvfs
->z_utf8
&& u8_validate(name
, strlen(name
),
1339 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1341 return (SET_ERROR(EILSEQ
));
1344 if (vap
->va_mask
& ATTR_XVATTR
) {
1345 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1346 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1354 if (*name
== '\0') {
1356 * Null component name refers to the directory itself.
1363 /* possible igrab(zp) */
1366 if (flag
& FIGNORECASE
)
1369 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1373 zfs_acl_ids_free(&acl_ids
);
1374 if (strcmp(name
, "..") == 0)
1375 error
= SET_ERROR(EISDIR
);
1385 * Create a new file object and update the directory
1388 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1390 zfs_acl_ids_free(&acl_ids
);
1395 * We only support the creation of regular files in
1396 * extended attribute directories.
1399 if ((dzp
->z_pflags
& ZFS_XATTR
) && !S_ISREG(vap
->va_mode
)) {
1401 zfs_acl_ids_free(&acl_ids
);
1402 error
= SET_ERROR(EINVAL
);
1406 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1407 cr
, vsecp
, &acl_ids
)) != 0)
1411 if (zfs_acl_ids_overquota(zfsvfs
, &acl_ids
)) {
1412 zfs_acl_ids_free(&acl_ids
);
1413 error
= SET_ERROR(EDQUOT
);
1417 tx
= dmu_tx_create(os
);
1419 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1420 ZFS_SA_BASE_ATTR_SIZE
);
1422 fuid_dirtied
= zfsvfs
->z_fuid_dirty
;
1424 zfs_fuid_txhold(zfsvfs
, tx
);
1425 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
1426 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
1427 if (!zfsvfs
->z_use_sa
&&
1428 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1429 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1430 0, acl_ids
.z_aclp
->z_acl_bytes
);
1432 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1434 zfs_dirent_unlock(dl
);
1435 if (error
== ERESTART
) {
1441 zfs_acl_ids_free(&acl_ids
);
1446 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
1449 zfs_fuid_sync(zfsvfs
, tx
);
1451 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
1452 txtype
= zfs_log_create_txtype(Z_FILE
, vsecp
, vap
);
1453 if (flag
& FIGNORECASE
)
1455 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, name
,
1456 vsecp
, acl_ids
.z_fuidp
, vap
);
1457 zfs_acl_ids_free(&acl_ids
);
1460 int aflags
= (flag
& FAPPEND
) ? V_APPEND
: 0;
1463 zfs_acl_ids_free(&acl_ids
);
1467 * A directory entry already exists for this name.
1470 * Can't truncate an existing file if in exclusive mode.
1473 error
= SET_ERROR(EEXIST
);
1477 * Can't open a directory for writing.
1479 if (S_ISDIR(ZTOI(zp
)->i_mode
)) {
1480 error
= SET_ERROR(EISDIR
);
1484 * Verify requested access to file.
1486 if (mode
&& (error
= zfs_zaccess_rwx(zp
, mode
, aflags
, cr
))) {
1490 mutex_enter(&dzp
->z_lock
);
1492 mutex_exit(&dzp
->z_lock
);
1495 * Truncate regular files if requested.
1497 if (S_ISREG(ZTOI(zp
)->i_mode
) &&
1498 (vap
->va_mask
& ATTR_SIZE
) && (vap
->va_size
== 0)) {
1499 /* we can't hold any locks when calling zfs_freesp() */
1501 zfs_dirent_unlock(dl
);
1504 error
= zfs_freesp(zp
, 0, 0, mode
, TRUE
);
1510 zfs_dirent_unlock(dl
);
1516 zfs_inode_update(dzp
);
1517 zfs_inode_update(zp
);
1521 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1522 zil_commit(zilog
, 0);
1527 EXPORT_SYMBOL(zfs_create
);
1531 zfs_tmpfile(struct inode
*dip
, vattr_t
*vap
, int excl
,
1532 int mode
, struct inode
**ipp
, cred_t
*cr
, int flag
, vsecattr_t
*vsecp
)
1534 znode_t
*zp
= NULL
, *dzp
= ITOZ(dip
);
1535 zfsvfs_t
*zfsvfs
= ITOZSB(dip
);
1541 zfs_acl_ids_t acl_ids
;
1542 boolean_t fuid_dirtied
;
1543 boolean_t have_acl
= B_FALSE
;
1544 boolean_t waited
= B_FALSE
;
1547 * If we have an ephemeral id, ACL, or XVATTR then
1548 * make sure file system is at proper version
1554 if (zfsvfs
->z_use_fuids
== B_FALSE
&&
1555 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1556 return (SET_ERROR(EINVAL
));
1562 if (vap
->va_mask
& ATTR_XVATTR
) {
1563 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1564 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1574 * Create a new file object and update the directory
1577 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
1579 zfs_acl_ids_free(&acl_ids
);
1583 if (!have_acl
&& (error
= zfs_acl_ids_create(dzp
, 0, vap
,
1584 cr
, vsecp
, &acl_ids
)) != 0)
1588 if (zfs_acl_ids_overquota(zfsvfs
, &acl_ids
)) {
1589 zfs_acl_ids_free(&acl_ids
);
1590 error
= SET_ERROR(EDQUOT
);
1594 tx
= dmu_tx_create(os
);
1596 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
1597 ZFS_SA_BASE_ATTR_SIZE
);
1598 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, FALSE
, NULL
);
1600 fuid_dirtied
= zfsvfs
->z_fuid_dirty
;
1602 zfs_fuid_txhold(zfsvfs
, tx
);
1603 if (!zfsvfs
->z_use_sa
&&
1604 acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
1605 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
1606 0, acl_ids
.z_aclp
->z_acl_bytes
);
1608 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1610 if (error
== ERESTART
) {
1616 zfs_acl_ids_free(&acl_ids
);
1621 zfs_mknode(dzp
, vap
, tx
, cr
, IS_TMPFILE
, &zp
, &acl_ids
);
1624 zfs_fuid_sync(zfsvfs
, tx
);
1626 /* Add to unlinked set */
1628 zfs_unlinked_add(zp
, tx
);
1629 zfs_acl_ids_free(&acl_ids
);
1637 zfs_inode_update(dzp
);
1638 zfs_inode_update(zp
);
1647 * Remove an entry from a directory.
1649 * IN: dip - inode of directory to remove entry from.
1650 * name - name of entry to remove.
1651 * cr - credentials of caller.
1653 * RETURN: 0 if success
1654 * error code if failure
1658 * ip - ctime (if nlink > 0)
1661 uint64_t null_xattr
= 0;
1665 zfs_remove(struct inode
*dip
, char *name
, cred_t
*cr
, int flags
)
1667 znode_t
*zp
, *dzp
= ITOZ(dip
);
1670 zfsvfs_t
*zfsvfs
= ITOZSB(dip
);
1672 uint64_t acl_obj
, xattr_obj
;
1673 uint64_t xattr_obj_unlinked
= 0;
1678 boolean_t may_delete_now
, delete_now
= FALSE
;
1679 boolean_t unlinked
, toobig
= FALSE
;
1681 pathname_t
*realnmp
= NULL
;
1685 boolean_t waited
= B_FALSE
;
1688 return (SET_ERROR(EINVAL
));
1692 zilog
= zfsvfs
->z_log
;
1694 if (flags
& FIGNORECASE
) {
1704 * Attempt to lock directory; fail if entry doesn't exist.
1706 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
1716 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
1721 * Need to use rmdir for removing directories.
1723 if (S_ISDIR(ip
->i_mode
)) {
1724 error
= SET_ERROR(EPERM
);
1730 dnlc_remove(dvp
, realnmp
->pn_buf
);
1732 dnlc_remove(dvp
, name
);
1733 #endif /* HAVE_DNLC */
1735 mutex_enter(&zp
->z_lock
);
1736 may_delete_now
= atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
);
1737 mutex_exit(&zp
->z_lock
);
1740 * We may delete the znode now, or we may put it in the unlinked set;
1741 * it depends on whether we're the last link, and on whether there are
1742 * other holds on the inode. So we dmu_tx_hold() the right things to
1743 * allow for either case.
1746 tx
= dmu_tx_create(zfsvfs
->z_os
);
1747 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
1748 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
1749 zfs_sa_upgrade_txholds(tx
, zp
);
1750 zfs_sa_upgrade_txholds(tx
, dzp
);
1751 if (may_delete_now
) {
1752 toobig
= zp
->z_size
> zp
->z_blksz
* zfs_delete_blocks
;
1753 /* if the file is too big, only hold_free a token amount */
1754 dmu_tx_hold_free(tx
, zp
->z_id
, 0,
1755 (toobig
? DMU_MAX_ACCESS
: DMU_OBJECT_END
));
1758 /* are there any extended attributes? */
1759 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zfsvfs
),
1760 &xattr_obj
, sizeof (xattr_obj
));
1761 if (error
== 0 && xattr_obj
) {
1762 error
= zfs_zget(zfsvfs
, xattr_obj
, &xzp
);
1764 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
1765 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
1768 mutex_enter(&zp
->z_lock
);
1769 if ((acl_obj
= zfs_external_acl(zp
)) != 0 && may_delete_now
)
1770 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
1771 mutex_exit(&zp
->z_lock
);
1773 /* charge as an update -- would be nice not to charge at all */
1774 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, FALSE
, NULL
);
1777 * Mark this transaction as typically resulting in a net free of space
1779 dmu_tx_mark_netfree(tx
);
1781 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
1783 zfs_dirent_unlock(dl
);
1784 if (error
== ERESTART
) {
1804 * Remove the directory entry.
1806 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, &unlinked
);
1815 * Hold z_lock so that we can make sure that the ACL obj
1816 * hasn't changed. Could have been deleted due to
1819 mutex_enter(&zp
->z_lock
);
1820 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zfsvfs
),
1821 &xattr_obj_unlinked
, sizeof (xattr_obj_unlinked
));
1822 delete_now
= may_delete_now
&& !toobig
&&
1823 atomic_read(&ip
->i_count
) == 1 && !(zp
->z_is_mapped
) &&
1824 xattr_obj
== xattr_obj_unlinked
&& zfs_external_acl(zp
) ==
1829 if (xattr_obj_unlinked
) {
1830 ASSERT3U(ZTOI(xzp
)->i_nlink
, ==, 2);
1831 mutex_enter(&xzp
->z_lock
);
1832 xzp
->z_unlinked
= 1;
1833 clear_nlink(ZTOI(xzp
));
1835 error
= sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zfsvfs
),
1836 &links
, sizeof (links
), tx
);
1837 ASSERT3U(error
, ==, 0);
1838 mutex_exit(&xzp
->z_lock
);
1839 zfs_unlinked_add(xzp
, tx
);
1842 error
= sa_remove(zp
->z_sa_hdl
,
1843 SA_ZPL_XATTR(zfsvfs
), tx
);
1845 error
= sa_update(zp
->z_sa_hdl
,
1846 SA_ZPL_XATTR(zfsvfs
), &null_xattr
,
1847 sizeof (uint64_t), tx
);
1851 * Add to the unlinked set because a new reference could be
1852 * taken concurrently resulting in a deferred destruction.
1854 zfs_unlinked_add(zp
, tx
);
1855 mutex_exit(&zp
->z_lock
);
1856 } else if (unlinked
) {
1857 mutex_exit(&zp
->z_lock
);
1858 zfs_unlinked_add(zp
, tx
);
1862 if (flags
& FIGNORECASE
)
1864 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, obj
);
1871 zfs_dirent_unlock(dl
);
1872 zfs_inode_update(dzp
);
1873 zfs_inode_update(zp
);
1881 zfs_inode_update(xzp
);
1882 zfs_iput_async(ZTOI(xzp
));
1885 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
1886 zil_commit(zilog
, 0);
1891 EXPORT_SYMBOL(zfs_remove
);
1894 * Create a new directory and insert it into dip using the name
1895 * provided. Return a pointer to the inserted directory.
1897 * IN: dip - inode of directory to add subdir to.
1898 * dirname - name of new directory.
1899 * vap - attributes of new directory.
1900 * cr - credentials of caller.
1901 * vsecp - ACL to be set
1903 * OUT: ipp - inode of created directory.
1905 * RETURN: 0 if success
1906 * error code if failure
1909 * dip - ctime|mtime updated
1910 * ipp - ctime|mtime|atime updated
1914 zfs_mkdir(struct inode
*dip
, char *dirname
, vattr_t
*vap
, struct inode
**ipp
,
1915 cred_t
*cr
, int flags
, vsecattr_t
*vsecp
)
1917 znode_t
*zp
, *dzp
= ITOZ(dip
);
1918 zfsvfs_t
*zfsvfs
= ITOZSB(dip
);
1926 gid_t gid
= crgetgid(cr
);
1927 zfs_acl_ids_t acl_ids
;
1928 boolean_t fuid_dirtied
;
1929 boolean_t waited
= B_FALSE
;
1931 ASSERT(S_ISDIR(vap
->va_mode
));
1934 * If we have an ephemeral id, ACL, or XVATTR then
1935 * make sure file system is at proper version
1939 if (zfsvfs
->z_use_fuids
== B_FALSE
&&
1940 (vsecp
|| IS_EPHEMERAL(uid
) || IS_EPHEMERAL(gid
)))
1941 return (SET_ERROR(EINVAL
));
1943 if (dirname
== NULL
)
1944 return (SET_ERROR(EINVAL
));
1948 zilog
= zfsvfs
->z_log
;
1950 if (dzp
->z_pflags
& ZFS_XATTR
) {
1952 return (SET_ERROR(EINVAL
));
1955 if (zfsvfs
->z_utf8
&& u8_validate(dirname
,
1956 strlen(dirname
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
1958 return (SET_ERROR(EILSEQ
));
1960 if (flags
& FIGNORECASE
)
1963 if (vap
->va_mask
& ATTR_XVATTR
) {
1964 if ((error
= secpolicy_xvattr((xvattr_t
*)vap
,
1965 crgetuid(cr
), cr
, vap
->va_mode
)) != 0) {
1971 if ((error
= zfs_acl_ids_create(dzp
, 0, vap
, cr
,
1972 vsecp
, &acl_ids
)) != 0) {
1977 * First make sure the new directory doesn't exist.
1979 * Existence is checked first to make sure we don't return
1980 * EACCES instead of EEXIST which can cause some applications
1986 if ((error
= zfs_dirent_lock(&dl
, dzp
, dirname
, &zp
, zf
,
1988 zfs_acl_ids_free(&acl_ids
);
1993 if ((error
= zfs_zaccess(dzp
, ACE_ADD_SUBDIRECTORY
, 0, B_FALSE
, cr
))) {
1994 zfs_acl_ids_free(&acl_ids
);
1995 zfs_dirent_unlock(dl
);
2000 if (zfs_acl_ids_overquota(zfsvfs
, &acl_ids
)) {
2001 zfs_acl_ids_free(&acl_ids
);
2002 zfs_dirent_unlock(dl
);
2004 return (SET_ERROR(EDQUOT
));
2008 * Add a new entry to the directory.
2010 tx
= dmu_tx_create(zfsvfs
->z_os
);
2011 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, dirname
);
2012 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
2013 fuid_dirtied
= zfsvfs
->z_fuid_dirty
;
2015 zfs_fuid_txhold(zfsvfs
, tx
);
2016 if (!zfsvfs
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
2017 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
2018 acl_ids
.z_aclp
->z_acl_bytes
);
2021 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
2022 ZFS_SA_BASE_ATTR_SIZE
);
2024 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
2026 zfs_dirent_unlock(dl
);
2027 if (error
== ERESTART
) {
2033 zfs_acl_ids_free(&acl_ids
);
2042 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
2045 zfs_fuid_sync(zfsvfs
, tx
);
2048 * Now put new name in parent dir.
2050 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
2054 txtype
= zfs_log_create_txtype(Z_DIR
, vsecp
, vap
);
2055 if (flags
& FIGNORECASE
)
2057 zfs_log_create(zilog
, tx
, txtype
, dzp
, zp
, dirname
, vsecp
,
2058 acl_ids
.z_fuidp
, vap
);
2060 zfs_acl_ids_free(&acl_ids
);
2064 zfs_dirent_unlock(dl
);
2066 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2067 zil_commit(zilog
, 0);
2069 zfs_inode_update(dzp
);
2070 zfs_inode_update(zp
);
2074 EXPORT_SYMBOL(zfs_mkdir
);
2077 * Remove a directory subdir entry. If the current working
2078 * directory is the same as the subdir to be removed, the
2081 * IN: dip - inode of directory to remove from.
2082 * name - name of directory to be removed.
2083 * cwd - inode of current working directory.
2084 * cr - credentials of caller.
2085 * flags - case flags
2087 * RETURN: 0 on success, error code on failure.
2090 * dip - ctime|mtime updated
2094 zfs_rmdir(struct inode
*dip
, char *name
, struct inode
*cwd
, cred_t
*cr
,
2097 znode_t
*dzp
= ITOZ(dip
);
2100 zfsvfs_t
*zfsvfs
= ITOZSB(dip
);
2106 boolean_t waited
= B_FALSE
;
2109 return (SET_ERROR(EINVAL
));
2113 zilog
= zfsvfs
->z_log
;
2115 if (flags
& FIGNORECASE
)
2121 * Attempt to lock directory; fail if entry doesn't exist.
2123 if ((error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
,
2131 if ((error
= zfs_zaccess_delete(dzp
, zp
, cr
))) {
2135 if (!S_ISDIR(ip
->i_mode
)) {
2136 error
= SET_ERROR(ENOTDIR
);
2141 error
= SET_ERROR(EINVAL
);
2146 * Grab a lock on the directory to make sure that no one is
2147 * trying to add (or lookup) entries while we are removing it.
2149 rw_enter(&zp
->z_name_lock
, RW_WRITER
);
2152 * Grab a lock on the parent pointer to make sure we play well
2153 * with the treewalk and directory rename code.
2155 rw_enter(&zp
->z_parent_lock
, RW_WRITER
);
2157 tx
= dmu_tx_create(zfsvfs
->z_os
);
2158 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, name
);
2159 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
2160 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, FALSE
, NULL
);
2161 zfs_sa_upgrade_txholds(tx
, zp
);
2162 zfs_sa_upgrade_txholds(tx
, dzp
);
2163 dmu_tx_mark_netfree(tx
);
2164 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
2166 rw_exit(&zp
->z_parent_lock
);
2167 rw_exit(&zp
->z_name_lock
);
2168 zfs_dirent_unlock(dl
);
2169 if (error
== ERESTART
) {
2182 error
= zfs_link_destroy(dl
, zp
, tx
, zflg
, NULL
);
2185 uint64_t txtype
= TX_RMDIR
;
2186 if (flags
& FIGNORECASE
)
2188 zfs_log_remove(zilog
, tx
, txtype
, dzp
, name
, ZFS_NO_OBJECT
);
2193 rw_exit(&zp
->z_parent_lock
);
2194 rw_exit(&zp
->z_name_lock
);
2196 zfs_dirent_unlock(dl
);
2198 zfs_inode_update(dzp
);
2199 zfs_inode_update(zp
);
2202 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
2203 zil_commit(zilog
, 0);
2208 EXPORT_SYMBOL(zfs_rmdir
);
2211 * Read as many directory entries as will fit into the provided
2212 * dirent buffer from the given directory cursor position.
2214 * IN: ip - inode of directory to read.
2215 * dirent - buffer for directory entries.
2217 * OUT: dirent - filler buffer of directory entries.
2219 * RETURN: 0 if success
2220 * error code if failure
2223 * ip - atime updated
2225 * Note that the low 4 bits of the cookie returned by zap is always zero.
2226 * This allows us to use the low range for "special" directory entries:
2227 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2228 * we use the offset 2 for the '.zfs' directory.
2232 zfs_readdir(struct inode
*ip
, struct dir_context
*ctx
, cred_t
*cr
)
2234 znode_t
*zp
= ITOZ(ip
);
2235 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
2238 zap_attribute_t zap
;
2244 uint64_t offset
; /* must be unsigned; checks for < 1 */
2249 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(zfsvfs
),
2250 &parent
, sizeof (parent
))) != 0)
2254 * Quit if directory has been removed (posix)
2262 prefetch
= zp
->z_zn_prefetch
;
2265 * Initialize the iterator cursor.
2269 * Start iteration from the beginning of the directory.
2271 zap_cursor_init(&zc
, os
, zp
->z_id
);
2274 * The offset is a serialized cursor.
2276 zap_cursor_init_serialized(&zc
, os
, zp
->z_id
, offset
);
2280 * Transform to file-system independent format
2285 * Special case `.', `..', and `.zfs'.
2288 (void) strcpy(zap
.za_name
, ".");
2289 zap
.za_normalization_conflict
= 0;
2292 } else if (offset
== 1) {
2293 (void) strcpy(zap
.za_name
, "..");
2294 zap
.za_normalization_conflict
= 0;
2297 } else if (offset
== 2 && zfs_show_ctldir(zp
)) {
2298 (void) strcpy(zap
.za_name
, ZFS_CTLDIR_NAME
);
2299 zap
.za_normalization_conflict
= 0;
2300 objnum
= ZFSCTL_INO_ROOT
;
2306 if ((error
= zap_cursor_retrieve(&zc
, &zap
))) {
2307 if (error
== ENOENT
)
2314 * Allow multiple entries provided the first entry is
2315 * the object id. Non-zpl consumers may safely make
2316 * use of the additional space.
2318 * XXX: This should be a feature flag for compatibility
2320 if (zap
.za_integer_length
!= 8 ||
2321 zap
.za_num_integers
== 0) {
2322 cmn_err(CE_WARN
, "zap_readdir: bad directory "
2323 "entry, obj = %lld, offset = %lld, "
2324 "length = %d, num = %lld\n",
2325 (u_longlong_t
)zp
->z_id
,
2326 (u_longlong_t
)offset
,
2327 zap
.za_integer_length
,
2328 (u_longlong_t
)zap
.za_num_integers
);
2329 error
= SET_ERROR(ENXIO
);
2333 objnum
= ZFS_DIRENT_OBJ(zap
.za_first_integer
);
2334 type
= ZFS_DIRENT_TYPE(zap
.za_first_integer
);
2337 done
= !dir_emit(ctx
, zap
.za_name
, strlen(zap
.za_name
),
2342 /* Prefetch znode */
2344 dmu_prefetch(os
, objnum
, 0, 0, 0,
2345 ZIO_PRIORITY_SYNC_READ
);
2349 * Move to the next entry, fill in the previous offset.
2351 if (offset
> 2 || (offset
== 2 && !zfs_show_ctldir(zp
))) {
2352 zap_cursor_advance(&zc
);
2353 offset
= zap_cursor_serialize(&zc
);
2359 zp
->z_zn_prefetch
= B_FALSE
; /* a lookup will re-enable pre-fetching */
2362 zap_cursor_fini(&zc
);
2363 if (error
== ENOENT
)
2370 EXPORT_SYMBOL(zfs_readdir
);
2372 ulong_t zfs_fsync_sync_cnt
= 4;
2375 zfs_fsync(struct inode
*ip
, int syncflag
, cred_t
*cr
)
2377 znode_t
*zp
= ITOZ(ip
);
2378 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
2380 (void) tsd_set(zfs_fsyncer_key
, (void *)zfs_fsync_sync_cnt
);
2382 if (zfsvfs
->z_os
->os_sync
!= ZFS_SYNC_DISABLED
) {
2385 zil_commit(zfsvfs
->z_log
, zp
->z_id
);
2388 tsd_set(zfs_fsyncer_key
, NULL
);
2392 EXPORT_SYMBOL(zfs_fsync
);
2396 * Get the requested file attributes and place them in the provided
2399 * IN: ip - inode of file.
2400 * vap - va_mask identifies requested attributes.
2401 * If ATTR_XVATTR set, then optional attrs are requested
2402 * flags - ATTR_NOACLCHECK (CIFS server context)
2403 * cr - credentials of caller.
2405 * OUT: vap - attribute values.
2407 * RETURN: 0 (always succeeds)
2411 zfs_getattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2413 znode_t
*zp
= ITOZ(ip
);
2414 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
2417 uint64_t atime
[2], mtime
[2], ctime
[2];
2418 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2419 xoptattr_t
*xoap
= NULL
;
2420 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2421 sa_bulk_attr_t bulk
[3];
2427 zfs_fuid_map_ids(zp
, cr
, &vap
->va_uid
, &vap
->va_gid
);
2429 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zfsvfs
), NULL
, &atime
, 16);
2430 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zfsvfs
), NULL
, &mtime
, 16);
2431 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
), NULL
, &ctime
, 16);
2433 if ((error
= sa_bulk_lookup(zp
->z_sa_hdl
, bulk
, count
)) != 0) {
2439 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2440 * Also, if we are the owner don't bother, since owner should
2441 * always be allowed to read basic attributes of file.
2443 if (!(zp
->z_pflags
& ZFS_ACL_TRIVIAL
) &&
2444 (vap
->va_uid
!= crgetuid(cr
))) {
2445 if ((error
= zfs_zaccess(zp
, ACE_READ_ATTRIBUTES
, 0,
2453 * Return all attributes. It's cheaper to provide the answer
2454 * than to determine whether we were asked the question.
2457 mutex_enter(&zp
->z_lock
);
2458 vap
->va_type
= vn_mode_to_vtype(zp
->z_mode
);
2459 vap
->va_mode
= zp
->z_mode
;
2460 vap
->va_fsid
= ZTOI(zp
)->i_sb
->s_dev
;
2461 vap
->va_nodeid
= zp
->z_id
;
2462 if ((zp
->z_id
== zfsvfs
->z_root
) && zfs_show_ctldir(zp
))
2463 links
= ZTOI(zp
)->i_nlink
+ 1;
2465 links
= ZTOI(zp
)->i_nlink
;
2466 vap
->va_nlink
= MIN(links
, ZFS_LINK_MAX
);
2467 vap
->va_size
= i_size_read(ip
);
2468 vap
->va_rdev
= ip
->i_rdev
;
2469 vap
->va_seq
= ip
->i_generation
;
2472 * Add in any requested optional attributes and the create time.
2473 * Also set the corresponding bits in the returned attribute bitmap.
2475 if ((xoap
= xva_getxoptattr(xvap
)) != NULL
&& zfsvfs
->z_use_fuids
) {
2476 if (XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
)) {
2478 ((zp
->z_pflags
& ZFS_ARCHIVE
) != 0);
2479 XVA_SET_RTN(xvap
, XAT_ARCHIVE
);
2482 if (XVA_ISSET_REQ(xvap
, XAT_READONLY
)) {
2483 xoap
->xoa_readonly
=
2484 ((zp
->z_pflags
& ZFS_READONLY
) != 0);
2485 XVA_SET_RTN(xvap
, XAT_READONLY
);
2488 if (XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)) {
2490 ((zp
->z_pflags
& ZFS_SYSTEM
) != 0);
2491 XVA_SET_RTN(xvap
, XAT_SYSTEM
);
2494 if (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
)) {
2496 ((zp
->z_pflags
& ZFS_HIDDEN
) != 0);
2497 XVA_SET_RTN(xvap
, XAT_HIDDEN
);
2500 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2501 xoap
->xoa_nounlink
=
2502 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0);
2503 XVA_SET_RTN(xvap
, XAT_NOUNLINK
);
2506 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2507 xoap
->xoa_immutable
=
2508 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0);
2509 XVA_SET_RTN(xvap
, XAT_IMMUTABLE
);
2512 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2513 xoap
->xoa_appendonly
=
2514 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0);
2515 XVA_SET_RTN(xvap
, XAT_APPENDONLY
);
2518 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2520 ((zp
->z_pflags
& ZFS_NODUMP
) != 0);
2521 XVA_SET_RTN(xvap
, XAT_NODUMP
);
2524 if (XVA_ISSET_REQ(xvap
, XAT_OPAQUE
)) {
2526 ((zp
->z_pflags
& ZFS_OPAQUE
) != 0);
2527 XVA_SET_RTN(xvap
, XAT_OPAQUE
);
2530 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2531 xoap
->xoa_av_quarantined
=
2532 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0);
2533 XVA_SET_RTN(xvap
, XAT_AV_QUARANTINED
);
2536 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2537 xoap
->xoa_av_modified
=
2538 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0);
2539 XVA_SET_RTN(xvap
, XAT_AV_MODIFIED
);
2542 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) &&
2543 S_ISREG(ip
->i_mode
)) {
2544 zfs_sa_get_scanstamp(zp
, xvap
);
2547 if (XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)) {
2550 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_CRTIME(zfsvfs
),
2551 times
, sizeof (times
));
2552 ZFS_TIME_DECODE(&xoap
->xoa_createtime
, times
);
2553 XVA_SET_RTN(xvap
, XAT_CREATETIME
);
2556 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2557 xoap
->xoa_reparse
= ((zp
->z_pflags
& ZFS_REPARSE
) != 0);
2558 XVA_SET_RTN(xvap
, XAT_REPARSE
);
2560 if (XVA_ISSET_REQ(xvap
, XAT_GEN
)) {
2561 xoap
->xoa_generation
= ip
->i_generation
;
2562 XVA_SET_RTN(xvap
, XAT_GEN
);
2565 if (XVA_ISSET_REQ(xvap
, XAT_OFFLINE
)) {
2567 ((zp
->z_pflags
& ZFS_OFFLINE
) != 0);
2568 XVA_SET_RTN(xvap
, XAT_OFFLINE
);
2571 if (XVA_ISSET_REQ(xvap
, XAT_SPARSE
)) {
2573 ((zp
->z_pflags
& ZFS_SPARSE
) != 0);
2574 XVA_SET_RTN(xvap
, XAT_SPARSE
);
2578 ZFS_TIME_DECODE(&vap
->va_atime
, atime
);
2579 ZFS_TIME_DECODE(&vap
->va_mtime
, mtime
);
2580 ZFS_TIME_DECODE(&vap
->va_ctime
, ctime
);
2582 mutex_exit(&zp
->z_lock
);
2584 sa_object_size(zp
->z_sa_hdl
, &vap
->va_blksize
, &vap
->va_nblocks
);
2586 if (zp
->z_blksz
== 0) {
2588 * Block size hasn't been set; suggest maximal I/O transfers.
2590 vap
->va_blksize
= zfsvfs
->z_max_blksz
;
2596 EXPORT_SYMBOL(zfs_getattr
);
2599 * Get the basic file attributes and place them in the provided kstat
2600 * structure. The inode is assumed to be the authoritative source
2601 * for most of the attributes. However, the znode currently has the
2602 * authoritative atime, blksize, and block count.
2604 * IN: ip - inode of file.
2606 * OUT: sp - kstat values.
2608 * RETURN: 0 (always succeeds)
2612 zfs_getattr_fast(struct inode
*ip
, struct kstat
*sp
)
2614 znode_t
*zp
= ITOZ(ip
);
2615 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
2617 u_longlong_t nblocks
;
2622 mutex_enter(&zp
->z_lock
);
2624 generic_fillattr(ip
, sp
);
2626 sa_object_size(zp
->z_sa_hdl
, &blksize
, &nblocks
);
2627 sp
->blksize
= blksize
;
2628 sp
->blocks
= nblocks
;
2630 if (unlikely(zp
->z_blksz
== 0)) {
2632 * Block size hasn't been set; suggest maximal I/O transfers.
2634 sp
->blksize
= zfsvfs
->z_max_blksz
;
2637 mutex_exit(&zp
->z_lock
);
2640 * Required to prevent NFS client from detecting different inode
2641 * numbers of snapshot root dentry before and after snapshot mount.
2643 if (zfsvfs
->z_issnap
) {
2644 if (ip
->i_sb
->s_root
->d_inode
== ip
)
2645 sp
->ino
= ZFSCTL_INO_SNAPDIRS
-
2646 dmu_objset_id(zfsvfs
->z_os
);
2653 EXPORT_SYMBOL(zfs_getattr_fast
);
2656 * Set the file attributes to the values contained in the
2659 * IN: ip - inode of file to be modified.
2660 * vap - new attribute values.
2661 * If ATTR_XVATTR set, then optional attrs are being set
2662 * flags - ATTR_UTIME set if non-default time values provided.
2663 * - ATTR_NOACLCHECK (CIFS context only).
2664 * cr - credentials of caller.
2666 * RETURN: 0 if success
2667 * error code if failure
2670 * ip - ctime updated, mtime updated if size changed.
2674 zfs_setattr(struct inode
*ip
, vattr_t
*vap
, int flags
, cred_t
*cr
)
2676 znode_t
*zp
= ITOZ(ip
);
2677 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
2681 xvattr_t
*tmpxvattr
;
2682 uint_t mask
= vap
->va_mask
;
2683 uint_t saved_mask
= 0;
2686 uint64_t new_kuid
= 0, new_kgid
= 0, new_uid
, new_gid
;
2688 uint64_t mtime
[2], ctime
[2], atime
[2];
2690 int need_policy
= FALSE
;
2692 zfs_fuid_info_t
*fuidp
= NULL
;
2693 xvattr_t
*xvap
= (xvattr_t
*)vap
; /* vap may be an xvattr_t * */
2696 boolean_t skipaclchk
= (flags
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
2697 boolean_t fuid_dirtied
= B_FALSE
;
2698 sa_bulk_attr_t
*bulk
, *xattr_bulk
;
2699 int count
= 0, xattr_count
= 0;
2707 zilog
= zfsvfs
->z_log
;
2710 * Make sure that if we have ephemeral uid/gid or xvattr specified
2711 * that file system is at proper version level
2714 if (zfsvfs
->z_use_fuids
== B_FALSE
&&
2715 (((mask
& ATTR_UID
) && IS_EPHEMERAL(vap
->va_uid
)) ||
2716 ((mask
& ATTR_GID
) && IS_EPHEMERAL(vap
->va_gid
)) ||
2717 (mask
& ATTR_XVATTR
))) {
2719 return (SET_ERROR(EINVAL
));
2722 if (mask
& ATTR_SIZE
&& S_ISDIR(ip
->i_mode
)) {
2724 return (SET_ERROR(EISDIR
));
2727 if (mask
& ATTR_SIZE
&& !S_ISREG(ip
->i_mode
) && !S_ISFIFO(ip
->i_mode
)) {
2729 return (SET_ERROR(EINVAL
));
2733 * If this is an xvattr_t, then get a pointer to the structure of
2734 * optional attributes. If this is NULL, then we have a vattr_t.
2736 xoap
= xva_getxoptattr(xvap
);
2738 tmpxvattr
= kmem_alloc(sizeof (xvattr_t
), KM_SLEEP
);
2739 xva_init(tmpxvattr
);
2741 bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2742 xattr_bulk
= kmem_alloc(sizeof (sa_bulk_attr_t
) * 7, KM_SLEEP
);
2745 * Immutable files can only alter immutable bit and atime
2747 if ((zp
->z_pflags
& ZFS_IMMUTABLE
) &&
2748 ((mask
& (ATTR_SIZE
|ATTR_UID
|ATTR_GID
|ATTR_MTIME
|ATTR_MODE
)) ||
2749 ((mask
& ATTR_XVATTR
) && XVA_ISSET_REQ(xvap
, XAT_CREATETIME
)))) {
2754 if ((mask
& ATTR_SIZE
) && (zp
->z_pflags
& ZFS_READONLY
)) {
2760 * Verify timestamps doesn't overflow 32 bits.
2761 * ZFS can handle large timestamps, but 32bit syscalls can't
2762 * handle times greater than 2039. This check should be removed
2763 * once large timestamps are fully supported.
2765 if (mask
& (ATTR_ATIME
| ATTR_MTIME
)) {
2766 if (((mask
& ATTR_ATIME
) &&
2767 TIMESPEC_OVERFLOW(&vap
->va_atime
)) ||
2768 ((mask
& ATTR_MTIME
) &&
2769 TIMESPEC_OVERFLOW(&vap
->va_mtime
))) {
2779 /* Can this be moved to before the top label? */
2780 if (zfs_is_readonly(zfsvfs
)) {
2786 * First validate permissions
2789 if (mask
& ATTR_SIZE
) {
2790 err
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, skipaclchk
, cr
);
2795 * XXX - Note, we are not providing any open
2796 * mode flags here (like FNDELAY), so we may
2797 * block if there are locks present... this
2798 * should be addressed in openat().
2800 /* XXX - would it be OK to generate a log record here? */
2801 err
= zfs_freesp(zp
, vap
->va_size
, 0, 0, FALSE
);
2806 if (mask
& (ATTR_ATIME
|ATTR_MTIME
) ||
2807 ((mask
& ATTR_XVATTR
) && (XVA_ISSET_REQ(xvap
, XAT_HIDDEN
) ||
2808 XVA_ISSET_REQ(xvap
, XAT_READONLY
) ||
2809 XVA_ISSET_REQ(xvap
, XAT_ARCHIVE
) ||
2810 XVA_ISSET_REQ(xvap
, XAT_OFFLINE
) ||
2811 XVA_ISSET_REQ(xvap
, XAT_SPARSE
) ||
2812 XVA_ISSET_REQ(xvap
, XAT_CREATETIME
) ||
2813 XVA_ISSET_REQ(xvap
, XAT_SYSTEM
)))) {
2814 need_policy
= zfs_zaccess(zp
, ACE_WRITE_ATTRIBUTES
, 0,
2818 if (mask
& (ATTR_UID
|ATTR_GID
)) {
2819 int idmask
= (mask
& (ATTR_UID
|ATTR_GID
));
2824 * NOTE: even if a new mode is being set,
2825 * we may clear S_ISUID/S_ISGID bits.
2828 if (!(mask
& ATTR_MODE
))
2829 vap
->va_mode
= zp
->z_mode
;
2832 * Take ownership or chgrp to group we are a member of
2835 take_owner
= (mask
& ATTR_UID
) && (vap
->va_uid
== crgetuid(cr
));
2836 take_group
= (mask
& ATTR_GID
) &&
2837 zfs_groupmember(zfsvfs
, vap
->va_gid
, cr
);
2840 * If both ATTR_UID and ATTR_GID are set then take_owner and
2841 * take_group must both be set in order to allow taking
2844 * Otherwise, send the check through secpolicy_vnode_setattr()
2848 if (((idmask
== (ATTR_UID
|ATTR_GID
)) &&
2849 take_owner
&& take_group
) ||
2850 ((idmask
== ATTR_UID
) && take_owner
) ||
2851 ((idmask
== ATTR_GID
) && take_group
)) {
2852 if (zfs_zaccess(zp
, ACE_WRITE_OWNER
, 0,
2853 skipaclchk
, cr
) == 0) {
2855 * Remove setuid/setgid for non-privileged users
2857 (void) secpolicy_setid_clear(vap
, cr
);
2858 trim_mask
= (mask
& (ATTR_UID
|ATTR_GID
));
2867 mutex_enter(&zp
->z_lock
);
2868 oldva
.va_mode
= zp
->z_mode
;
2869 zfs_fuid_map_ids(zp
, cr
, &oldva
.va_uid
, &oldva
.va_gid
);
2870 if (mask
& ATTR_XVATTR
) {
2872 * Update xvattr mask to include only those attributes
2873 * that are actually changing.
2875 * the bits will be restored prior to actually setting
2876 * the attributes so the caller thinks they were set.
2878 if (XVA_ISSET_REQ(xvap
, XAT_APPENDONLY
)) {
2879 if (xoap
->xoa_appendonly
!=
2880 ((zp
->z_pflags
& ZFS_APPENDONLY
) != 0)) {
2883 XVA_CLR_REQ(xvap
, XAT_APPENDONLY
);
2884 XVA_SET_REQ(tmpxvattr
, XAT_APPENDONLY
);
2888 if (XVA_ISSET_REQ(xvap
, XAT_NOUNLINK
)) {
2889 if (xoap
->xoa_nounlink
!=
2890 ((zp
->z_pflags
& ZFS_NOUNLINK
) != 0)) {
2893 XVA_CLR_REQ(xvap
, XAT_NOUNLINK
);
2894 XVA_SET_REQ(tmpxvattr
, XAT_NOUNLINK
);
2898 if (XVA_ISSET_REQ(xvap
, XAT_IMMUTABLE
)) {
2899 if (xoap
->xoa_immutable
!=
2900 ((zp
->z_pflags
& ZFS_IMMUTABLE
) != 0)) {
2903 XVA_CLR_REQ(xvap
, XAT_IMMUTABLE
);
2904 XVA_SET_REQ(tmpxvattr
, XAT_IMMUTABLE
);
2908 if (XVA_ISSET_REQ(xvap
, XAT_NODUMP
)) {
2909 if (xoap
->xoa_nodump
!=
2910 ((zp
->z_pflags
& ZFS_NODUMP
) != 0)) {
2913 XVA_CLR_REQ(xvap
, XAT_NODUMP
);
2914 XVA_SET_REQ(tmpxvattr
, XAT_NODUMP
);
2918 if (XVA_ISSET_REQ(xvap
, XAT_AV_MODIFIED
)) {
2919 if (xoap
->xoa_av_modified
!=
2920 ((zp
->z_pflags
& ZFS_AV_MODIFIED
) != 0)) {
2923 XVA_CLR_REQ(xvap
, XAT_AV_MODIFIED
);
2924 XVA_SET_REQ(tmpxvattr
, XAT_AV_MODIFIED
);
2928 if (XVA_ISSET_REQ(xvap
, XAT_AV_QUARANTINED
)) {
2929 if ((!S_ISREG(ip
->i_mode
) &&
2930 xoap
->xoa_av_quarantined
) ||
2931 xoap
->xoa_av_quarantined
!=
2932 ((zp
->z_pflags
& ZFS_AV_QUARANTINED
) != 0)) {
2935 XVA_CLR_REQ(xvap
, XAT_AV_QUARANTINED
);
2936 XVA_SET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
);
2940 if (XVA_ISSET_REQ(xvap
, XAT_REPARSE
)) {
2941 mutex_exit(&zp
->z_lock
);
2946 if (need_policy
== FALSE
&&
2947 (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
) ||
2948 XVA_ISSET_REQ(xvap
, XAT_OPAQUE
))) {
2953 mutex_exit(&zp
->z_lock
);
2955 if (mask
& ATTR_MODE
) {
2956 if (zfs_zaccess(zp
, ACE_WRITE_ACL
, 0, skipaclchk
, cr
) == 0) {
2957 err
= secpolicy_setid_setsticky_clear(ip
, vap
,
2962 trim_mask
|= ATTR_MODE
;
2970 * If trim_mask is set then take ownership
2971 * has been granted or write_acl is present and user
2972 * has the ability to modify mode. In that case remove
2973 * UID|GID and or MODE from mask so that
2974 * secpolicy_vnode_setattr() doesn't revoke it.
2978 saved_mask
= vap
->va_mask
;
2979 vap
->va_mask
&= ~trim_mask
;
2981 err
= secpolicy_vnode_setattr(cr
, ip
, vap
, &oldva
, flags
,
2982 (int (*)(void *, int, cred_t
*))zfs_zaccess_unix
, zp
);
2987 vap
->va_mask
|= saved_mask
;
2991 * secpolicy_vnode_setattr, or take ownership may have
2994 mask
= vap
->va_mask
;
2996 if ((mask
& (ATTR_UID
| ATTR_GID
))) {
2997 err
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zfsvfs
),
2998 &xattr_obj
, sizeof (xattr_obj
));
3000 if (err
== 0 && xattr_obj
) {
3001 err
= zfs_zget(ZTOZSB(zp
), xattr_obj
, &attrzp
);
3005 if (mask
& ATTR_UID
) {
3006 new_kuid
= zfs_fuid_create(zfsvfs
,
3007 (uint64_t)vap
->va_uid
, cr
, ZFS_OWNER
, &fuidp
);
3008 if (new_kuid
!= KUID_TO_SUID(ZTOI(zp
)->i_uid
) &&
3009 zfs_fuid_overquota(zfsvfs
, B_FALSE
, new_kuid
)) {
3017 if (mask
& ATTR_GID
) {
3018 new_kgid
= zfs_fuid_create(zfsvfs
,
3019 (uint64_t)vap
->va_gid
, cr
, ZFS_GROUP
, &fuidp
);
3020 if (new_kgid
!= KGID_TO_SGID(ZTOI(zp
)->i_gid
) &&
3021 zfs_fuid_overquota(zfsvfs
, B_TRUE
, new_kgid
)) {
3029 tx
= dmu_tx_create(zfsvfs
->z_os
);
3031 if (mask
& ATTR_MODE
) {
3032 uint64_t pmode
= zp
->z_mode
;
3034 new_mode
= (pmode
& S_IFMT
) | (vap
->va_mode
& ~S_IFMT
);
3036 zfs_acl_chmod_setattr(zp
, &aclp
, new_mode
);
3038 mutex_enter(&zp
->z_lock
);
3039 if (!zp
->z_is_sa
&& ((acl_obj
= zfs_external_acl(zp
)) != 0)) {
3041 * Are we upgrading ACL from old V0 format
3044 if (zfsvfs
->z_version
>= ZPL_VERSION_FUID
&&
3045 zfs_znode_acl_version(zp
) ==
3046 ZFS_ACL_VERSION_INITIAL
) {
3047 dmu_tx_hold_free(tx
, acl_obj
, 0,
3049 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
3050 0, aclp
->z_acl_bytes
);
3052 dmu_tx_hold_write(tx
, acl_obj
, 0,
3055 } else if (!zp
->z_is_sa
&& aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3056 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
,
3057 0, aclp
->z_acl_bytes
);
3059 mutex_exit(&zp
->z_lock
);
3060 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
3062 if ((mask
& ATTR_XVATTR
) &&
3063 XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
3064 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
3066 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
3070 dmu_tx_hold_sa(tx
, attrzp
->z_sa_hdl
, B_FALSE
);
3073 fuid_dirtied
= zfsvfs
->z_fuid_dirty
;
3075 zfs_fuid_txhold(zfsvfs
, tx
);
3077 zfs_sa_upgrade_txholds(tx
, zp
);
3079 err
= dmu_tx_assign(tx
, TXG_WAIT
);
3085 * Set each attribute requested.
3086 * We group settings according to the locks they need to acquire.
3088 * Note: you cannot set ctime directly, although it will be
3089 * updated as a side-effect of calling this function.
3093 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3094 mutex_enter(&zp
->z_acl_lock
);
3095 mutex_enter(&zp
->z_lock
);
3097 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zfsvfs
), NULL
,
3098 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
3101 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3102 mutex_enter(&attrzp
->z_acl_lock
);
3103 mutex_enter(&attrzp
->z_lock
);
3104 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3105 SA_ZPL_FLAGS(zfsvfs
), NULL
, &attrzp
->z_pflags
,
3106 sizeof (attrzp
->z_pflags
));
3109 if (mask
& (ATTR_UID
|ATTR_GID
)) {
3111 if (mask
& ATTR_UID
) {
3112 ZTOI(zp
)->i_uid
= SUID_TO_KUID(new_kuid
);
3113 new_uid
= zfs_uid_read(ZTOI(zp
));
3114 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_UID(zfsvfs
), NULL
,
3115 &new_uid
, sizeof (new_uid
));
3117 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3118 SA_ZPL_UID(zfsvfs
), NULL
, &new_uid
,
3120 ZTOI(attrzp
)->i_uid
= SUID_TO_KUID(new_uid
);
3124 if (mask
& ATTR_GID
) {
3125 ZTOI(zp
)->i_gid
= SGID_TO_KGID(new_kgid
);
3126 new_gid
= zfs_gid_read(ZTOI(zp
));
3127 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_GID(zfsvfs
),
3128 NULL
, &new_gid
, sizeof (new_gid
));
3130 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3131 SA_ZPL_GID(zfsvfs
), NULL
, &new_gid
,
3133 ZTOI(attrzp
)->i_gid
= SGID_TO_KGID(new_kgid
);
3136 if (!(mask
& ATTR_MODE
)) {
3137 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zfsvfs
),
3138 NULL
, &new_mode
, sizeof (new_mode
));
3139 new_mode
= zp
->z_mode
;
3141 err
= zfs_acl_chown_setattr(zp
);
3144 err
= zfs_acl_chown_setattr(attrzp
);
3149 if (mask
& ATTR_MODE
) {
3150 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MODE(zfsvfs
), NULL
,
3151 &new_mode
, sizeof (new_mode
));
3152 zp
->z_mode
= ZTOI(zp
)->i_mode
= new_mode
;
3153 ASSERT3P(aclp
, !=, NULL
);
3154 err
= zfs_aclset_common(zp
, aclp
, cr
, tx
);
3156 if (zp
->z_acl_cached
)
3157 zfs_acl_free(zp
->z_acl_cached
);
3158 zp
->z_acl_cached
= aclp
;
3162 if ((mask
& ATTR_ATIME
) || zp
->z_atime_dirty
) {
3163 zp
->z_atime_dirty
= 0;
3164 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
3165 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_ATIME(zfsvfs
), NULL
,
3166 &atime
, sizeof (atime
));
3169 if (mask
& ATTR_MTIME
) {
3170 ZFS_TIME_ENCODE(&vap
->va_mtime
, mtime
);
3171 ZTOI(zp
)->i_mtime
= timespec_trunc(vap
->va_mtime
,
3172 ZTOI(zp
)->i_sb
->s_time_gran
);
3174 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zfsvfs
), NULL
,
3175 mtime
, sizeof (mtime
));
3178 if (mask
& ATTR_CTIME
) {
3179 ZFS_TIME_ENCODE(&vap
->va_ctime
, ctime
);
3180 ZTOI(zp
)->i_ctime
= timespec_trunc(vap
->va_ctime
,
3181 ZTOI(zp
)->i_sb
->s_time_gran
);
3182 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
), NULL
,
3183 ctime
, sizeof (ctime
));
3186 if (attrzp
&& mask
) {
3187 SA_ADD_BULK_ATTR(xattr_bulk
, xattr_count
,
3188 SA_ZPL_CTIME(zfsvfs
), NULL
, &ctime
,
3193 * Do this after setting timestamps to prevent timestamp
3194 * update from toggling bit
3197 if (xoap
&& (mask
& ATTR_XVATTR
)) {
3200 * restore trimmed off masks
3201 * so that return masks can be set for caller.
3204 if (XVA_ISSET_REQ(tmpxvattr
, XAT_APPENDONLY
)) {
3205 XVA_SET_REQ(xvap
, XAT_APPENDONLY
);
3207 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NOUNLINK
)) {
3208 XVA_SET_REQ(xvap
, XAT_NOUNLINK
);
3210 if (XVA_ISSET_REQ(tmpxvattr
, XAT_IMMUTABLE
)) {
3211 XVA_SET_REQ(xvap
, XAT_IMMUTABLE
);
3213 if (XVA_ISSET_REQ(tmpxvattr
, XAT_NODUMP
)) {
3214 XVA_SET_REQ(xvap
, XAT_NODUMP
);
3216 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_MODIFIED
)) {
3217 XVA_SET_REQ(xvap
, XAT_AV_MODIFIED
);
3219 if (XVA_ISSET_REQ(tmpxvattr
, XAT_AV_QUARANTINED
)) {
3220 XVA_SET_REQ(xvap
, XAT_AV_QUARANTINED
);
3223 if (XVA_ISSET_REQ(xvap
, XAT_AV_SCANSTAMP
))
3224 ASSERT(S_ISREG(ip
->i_mode
));
3226 zfs_xvattr_set(zp
, xvap
, tx
);
3230 zfs_fuid_sync(zfsvfs
, tx
);
3233 zfs_log_setattr(zilog
, tx
, TX_SETATTR
, zp
, vap
, mask
, fuidp
);
3235 mutex_exit(&zp
->z_lock
);
3236 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3237 mutex_exit(&zp
->z_acl_lock
);
3240 if (mask
& (ATTR_UID
|ATTR_GID
|ATTR_MODE
))
3241 mutex_exit(&attrzp
->z_acl_lock
);
3242 mutex_exit(&attrzp
->z_lock
);
3245 if (err
== 0 && attrzp
) {
3246 err2
= sa_bulk_update(attrzp
->z_sa_hdl
, xattr_bulk
,
3255 zfs_fuid_info_free(fuidp
);
3263 if (err
== ERESTART
)
3266 err2
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
3270 zfs_inode_update(zp
);
3274 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3275 zil_commit(zilog
, 0);
3278 kmem_free(xattr_bulk
, sizeof (sa_bulk_attr_t
) * 7);
3279 kmem_free(bulk
, sizeof (sa_bulk_attr_t
) * 7);
3280 kmem_free(tmpxvattr
, sizeof (xvattr_t
));
3284 EXPORT_SYMBOL(zfs_setattr
);
3286 typedef struct zfs_zlock
{
3287 krwlock_t
*zl_rwlock
; /* lock we acquired */
3288 znode_t
*zl_znode
; /* znode we held */
3289 struct zfs_zlock
*zl_next
; /* next in list */
3293 * Drop locks and release vnodes that were held by zfs_rename_lock().
3296 zfs_rename_unlock(zfs_zlock_t
**zlpp
)
3300 while ((zl
= *zlpp
) != NULL
) {
3301 if (zl
->zl_znode
!= NULL
)
3302 zfs_iput_async(ZTOI(zl
->zl_znode
));
3303 rw_exit(zl
->zl_rwlock
);
3304 *zlpp
= zl
->zl_next
;
3305 kmem_free(zl
, sizeof (*zl
));
3310 * Search back through the directory tree, using the ".." entries.
3311 * Lock each directory in the chain to prevent concurrent renames.
3312 * Fail any attempt to move a directory into one of its own descendants.
3313 * XXX - z_parent_lock can overlap with map or grow locks
3316 zfs_rename_lock(znode_t
*szp
, znode_t
*tdzp
, znode_t
*sdzp
, zfs_zlock_t
**zlpp
)
3320 uint64_t rootid
= ZTOZSB(zp
)->z_root
;
3321 uint64_t oidp
= zp
->z_id
;
3322 krwlock_t
*rwlp
= &szp
->z_parent_lock
;
3323 krw_t rw
= RW_WRITER
;
3326 * First pass write-locks szp and compares to zp->z_id.
3327 * Later passes read-lock zp and compare to zp->z_parent.
3330 if (!rw_tryenter(rwlp
, rw
)) {
3332 * Another thread is renaming in this path.
3333 * Note that if we are a WRITER, we don't have any
3334 * parent_locks held yet.
3336 if (rw
== RW_READER
&& zp
->z_id
> szp
->z_id
) {
3338 * Drop our locks and restart
3340 zfs_rename_unlock(&zl
);
3344 rwlp
= &szp
->z_parent_lock
;
3349 * Wait for other thread to drop its locks
3355 zl
= kmem_alloc(sizeof (*zl
), KM_SLEEP
);
3356 zl
->zl_rwlock
= rwlp
;
3357 zl
->zl_znode
= NULL
;
3358 zl
->zl_next
= *zlpp
;
3361 if (oidp
== szp
->z_id
) /* We're a descendant of szp */
3362 return (SET_ERROR(EINVAL
));
3364 if (oidp
== rootid
) /* We've hit the top */
3367 if (rw
== RW_READER
) { /* i.e. not the first pass */
3368 int error
= zfs_zget(ZTOZSB(zp
), oidp
, &zp
);
3373 (void) sa_lookup(zp
->z_sa_hdl
, SA_ZPL_PARENT(ZTOZSB(zp
)),
3374 &oidp
, sizeof (oidp
));
3375 rwlp
= &zp
->z_parent_lock
;
3378 } while (zp
->z_id
!= sdzp
->z_id
);
3384 * Move an entry from the provided source directory to the target
3385 * directory. Change the entry name as indicated.
3387 * IN: sdip - Source directory containing the "old entry".
3388 * snm - Old entry name.
3389 * tdip - Target directory to contain the "new entry".
3390 * tnm - New entry name.
3391 * cr - credentials of caller.
3392 * flags - case flags
3394 * RETURN: 0 on success, error code on failure.
3397 * sdip,tdip - ctime|mtime updated
3401 zfs_rename(struct inode
*sdip
, char *snm
, struct inode
*tdip
, char *tnm
,
3402 cred_t
*cr
, int flags
)
3404 znode_t
*tdzp
, *szp
, *tzp
;
3405 znode_t
*sdzp
= ITOZ(sdip
);
3406 zfsvfs_t
*zfsvfs
= ITOZSB(sdip
);
3408 zfs_dirlock_t
*sdl
, *tdl
;
3411 int cmp
, serr
, terr
;
3414 boolean_t waited
= B_FALSE
;
3416 if (snm
== NULL
|| tnm
== NULL
)
3417 return (SET_ERROR(EINVAL
));
3420 ZFS_VERIFY_ZP(sdzp
);
3421 zilog
= zfsvfs
->z_log
;
3424 ZFS_VERIFY_ZP(tdzp
);
3427 * We check i_sb because snapshots and the ctldir must have different
3430 if (tdip
->i_sb
!= sdip
->i_sb
|| zfsctl_is_node(tdip
)) {
3432 return (SET_ERROR(EXDEV
));
3435 if (zfsvfs
->z_utf8
&& u8_validate(tnm
,
3436 strlen(tnm
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3438 return (SET_ERROR(EILSEQ
));
3441 if (flags
& FIGNORECASE
)
3450 * This is to prevent the creation of links into attribute space
3451 * by renaming a linked file into/outof an attribute directory.
3452 * See the comment in zfs_link() for why this is considered bad.
3454 if ((tdzp
->z_pflags
& ZFS_XATTR
) != (sdzp
->z_pflags
& ZFS_XATTR
)) {
3456 return (SET_ERROR(EINVAL
));
3460 * Lock source and target directory entries. To prevent deadlock,
3461 * a lock ordering must be defined. We lock the directory with
3462 * the smallest object id first, or if it's a tie, the one with
3463 * the lexically first name.
3465 if (sdzp
->z_id
< tdzp
->z_id
) {
3467 } else if (sdzp
->z_id
> tdzp
->z_id
) {
3471 * First compare the two name arguments without
3472 * considering any case folding.
3474 int nofold
= (zfsvfs
->z_norm
& ~U8_TEXTPREP_TOUPPER
);
3476 cmp
= u8_strcmp(snm
, tnm
, 0, nofold
, U8_UNICODE_LATEST
, &error
);
3477 ASSERT(error
== 0 || !zfsvfs
->z_utf8
);
3480 * POSIX: "If the old argument and the new argument
3481 * both refer to links to the same existing file,
3482 * the rename() function shall return successfully
3483 * and perform no other action."
3489 * If the file system is case-folding, then we may
3490 * have some more checking to do. A case-folding file
3491 * system is either supporting mixed case sensitivity
3492 * access or is completely case-insensitive. Note
3493 * that the file system is always case preserving.
3495 * In mixed sensitivity mode case sensitive behavior
3496 * is the default. FIGNORECASE must be used to
3497 * explicitly request case insensitive behavior.
3499 * If the source and target names provided differ only
3500 * by case (e.g., a request to rename 'tim' to 'Tim'),
3501 * we will treat this as a special case in the
3502 * case-insensitive mode: as long as the source name
3503 * is an exact match, we will allow this to proceed as
3504 * a name-change request.
3506 if ((zfsvfs
->z_case
== ZFS_CASE_INSENSITIVE
||
3507 (zfsvfs
->z_case
== ZFS_CASE_MIXED
&&
3508 flags
& FIGNORECASE
)) &&
3509 u8_strcmp(snm
, tnm
, 0, zfsvfs
->z_norm
, U8_UNICODE_LATEST
,
3512 * case preserving rename request, require exact
3521 * If the source and destination directories are the same, we should
3522 * grab the z_name_lock of that directory only once.
3526 rw_enter(&sdzp
->z_name_lock
, RW_READER
);
3530 serr
= zfs_dirent_lock(&sdl
, sdzp
, snm
, &szp
,
3531 ZEXISTS
| zflg
, NULL
, NULL
);
3532 terr
= zfs_dirent_lock(&tdl
,
3533 tdzp
, tnm
, &tzp
, ZRENAMING
| zflg
, NULL
, NULL
);
3535 terr
= zfs_dirent_lock(&tdl
,
3536 tdzp
, tnm
, &tzp
, zflg
, NULL
, NULL
);
3537 serr
= zfs_dirent_lock(&sdl
,
3538 sdzp
, snm
, &szp
, ZEXISTS
| ZRENAMING
| zflg
,
3544 * Source entry invalid or not there.
3547 zfs_dirent_unlock(tdl
);
3553 rw_exit(&sdzp
->z_name_lock
);
3555 if (strcmp(snm
, "..") == 0)
3561 zfs_dirent_unlock(sdl
);
3565 rw_exit(&sdzp
->z_name_lock
);
3567 if (strcmp(tnm
, "..") == 0)
3574 * Must have write access at the source to remove the old entry
3575 * and write access at the target to create the new entry.
3576 * Note that if target and source are the same, this can be
3577 * done in a single check.
3580 if ((error
= zfs_zaccess_rename(sdzp
, szp
, tdzp
, tzp
, cr
)))
3583 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3585 * Check to make sure rename is valid.
3586 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3588 if ((error
= zfs_rename_lock(szp
, tdzp
, sdzp
, &zl
)))
3593 * Does target exist?
3597 * Source and target must be the same type.
3599 if (S_ISDIR(ZTOI(szp
)->i_mode
)) {
3600 if (!S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3601 error
= SET_ERROR(ENOTDIR
);
3605 if (S_ISDIR(ZTOI(tzp
)->i_mode
)) {
3606 error
= SET_ERROR(EISDIR
);
3611 * POSIX dictates that when the source and target
3612 * entries refer to the same file object, rename
3613 * must do nothing and exit without error.
3615 if (szp
->z_id
== tzp
->z_id
) {
3621 tx
= dmu_tx_create(zfsvfs
->z_os
);
3622 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
3623 dmu_tx_hold_sa(tx
, sdzp
->z_sa_hdl
, B_FALSE
);
3624 dmu_tx_hold_zap(tx
, sdzp
->z_id
, FALSE
, snm
);
3625 dmu_tx_hold_zap(tx
, tdzp
->z_id
, TRUE
, tnm
);
3627 dmu_tx_hold_sa(tx
, tdzp
->z_sa_hdl
, B_FALSE
);
3628 zfs_sa_upgrade_txholds(tx
, tdzp
);
3631 dmu_tx_hold_sa(tx
, tzp
->z_sa_hdl
, B_FALSE
);
3632 zfs_sa_upgrade_txholds(tx
, tzp
);
3635 zfs_sa_upgrade_txholds(tx
, szp
);
3636 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, FALSE
, NULL
);
3637 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3640 zfs_rename_unlock(&zl
);
3641 zfs_dirent_unlock(sdl
);
3642 zfs_dirent_unlock(tdl
);
3645 rw_exit(&sdzp
->z_name_lock
);
3647 if (error
== ERESTART
) {
3664 if (tzp
) /* Attempt to remove the existing target */
3665 error
= zfs_link_destroy(tdl
, tzp
, tx
, zflg
, NULL
);
3668 error
= zfs_link_create(tdl
, szp
, tx
, ZRENAMING
);
3670 szp
->z_pflags
|= ZFS_AV_MODIFIED
;
3672 error
= sa_update(szp
->z_sa_hdl
, SA_ZPL_FLAGS(zfsvfs
),
3673 (void *)&szp
->z_pflags
, sizeof (uint64_t), tx
);
3676 error
= zfs_link_destroy(sdl
, szp
, tx
, ZRENAMING
, NULL
);
3678 zfs_log_rename(zilog
, tx
, TX_RENAME
|
3679 (flags
& FIGNORECASE
? TX_CI
: 0), sdzp
,
3680 sdl
->dl_name
, tdzp
, tdl
->dl_name
, szp
);
3683 * At this point, we have successfully created
3684 * the target name, but have failed to remove
3685 * the source name. Since the create was done
3686 * with the ZRENAMING flag, there are
3687 * complications; for one, the link count is
3688 * wrong. The easiest way to deal with this
3689 * is to remove the newly created target, and
3690 * return the original error. This must
3691 * succeed; fortunately, it is very unlikely to
3692 * fail, since we just created it.
3694 VERIFY3U(zfs_link_destroy(tdl
, szp
, tx
,
3695 ZRENAMING
, NULL
), ==, 0);
3703 zfs_rename_unlock(&zl
);
3705 zfs_dirent_unlock(sdl
);
3706 zfs_dirent_unlock(tdl
);
3708 zfs_inode_update(sdzp
);
3710 rw_exit(&sdzp
->z_name_lock
);
3713 zfs_inode_update(tdzp
);
3715 zfs_inode_update(szp
);
3718 zfs_inode_update(tzp
);
3722 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3723 zil_commit(zilog
, 0);
3728 EXPORT_SYMBOL(zfs_rename
);
3731 * Insert the indicated symbolic reference entry into the directory.
3733 * IN: dip - Directory to contain new symbolic link.
3734 * link - Name for new symlink entry.
3735 * vap - Attributes of new entry.
3736 * target - Target path of new symlink.
3738 * cr - credentials of caller.
3739 * flags - case flags
3741 * RETURN: 0 on success, error code on failure.
3744 * dip - ctime|mtime updated
3748 zfs_symlink(struct inode
*dip
, char *name
, vattr_t
*vap
, char *link
,
3749 struct inode
**ipp
, cred_t
*cr
, int flags
)
3751 znode_t
*zp
, *dzp
= ITOZ(dip
);
3754 zfsvfs_t
*zfsvfs
= ITOZSB(dip
);
3756 uint64_t len
= strlen(link
);
3759 zfs_acl_ids_t acl_ids
;
3760 boolean_t fuid_dirtied
;
3761 uint64_t txtype
= TX_SYMLINK
;
3762 boolean_t waited
= B_FALSE
;
3764 ASSERT(S_ISLNK(vap
->va_mode
));
3767 return (SET_ERROR(EINVAL
));
3771 zilog
= zfsvfs
->z_log
;
3773 if (zfsvfs
->z_utf8
&& u8_validate(name
, strlen(name
),
3774 NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
3776 return (SET_ERROR(EILSEQ
));
3778 if (flags
& FIGNORECASE
)
3781 if (len
> MAXPATHLEN
) {
3783 return (SET_ERROR(ENAMETOOLONG
));
3786 if ((error
= zfs_acl_ids_create(dzp
, 0,
3787 vap
, cr
, NULL
, &acl_ids
)) != 0) {
3795 * Attempt to lock directory; fail if entry already exists.
3797 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zflg
, NULL
, NULL
);
3799 zfs_acl_ids_free(&acl_ids
);
3804 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
3805 zfs_acl_ids_free(&acl_ids
);
3806 zfs_dirent_unlock(dl
);
3811 if (zfs_acl_ids_overquota(zfsvfs
, &acl_ids
)) {
3812 zfs_acl_ids_free(&acl_ids
);
3813 zfs_dirent_unlock(dl
);
3815 return (SET_ERROR(EDQUOT
));
3817 tx
= dmu_tx_create(zfsvfs
->z_os
);
3818 fuid_dirtied
= zfsvfs
->z_fuid_dirty
;
3819 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0, MAX(1, len
));
3820 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
3821 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
3822 ZFS_SA_BASE_ATTR_SIZE
+ len
);
3823 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
3824 if (!zfsvfs
->z_use_sa
&& acl_ids
.z_aclp
->z_acl_bytes
> ZFS_ACE_SPACE
) {
3825 dmu_tx_hold_write(tx
, DMU_NEW_OBJECT
, 0,
3826 acl_ids
.z_aclp
->z_acl_bytes
);
3829 zfs_fuid_txhold(zfsvfs
, tx
);
3830 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
3832 zfs_dirent_unlock(dl
);
3833 if (error
== ERESTART
) {
3839 zfs_acl_ids_free(&acl_ids
);
3846 * Create a new object for the symlink.
3847 * for version 4 ZPL datsets the symlink will be an SA attribute
3849 zfs_mknode(dzp
, vap
, tx
, cr
, 0, &zp
, &acl_ids
);
3852 zfs_fuid_sync(zfsvfs
, tx
);
3854 mutex_enter(&zp
->z_lock
);
3856 error
= sa_update(zp
->z_sa_hdl
, SA_ZPL_SYMLINK(zfsvfs
),
3859 zfs_sa_symlink(zp
, link
, len
, tx
);
3860 mutex_exit(&zp
->z_lock
);
3863 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_SIZE(zfsvfs
),
3864 &zp
->z_size
, sizeof (zp
->z_size
), tx
);
3866 * Insert the new object into the directory.
3868 (void) zfs_link_create(dl
, zp
, tx
, ZNEW
);
3870 if (flags
& FIGNORECASE
)
3872 zfs_log_symlink(zilog
, tx
, txtype
, dzp
, zp
, name
, link
);
3874 zfs_inode_update(dzp
);
3875 zfs_inode_update(zp
);
3877 zfs_acl_ids_free(&acl_ids
);
3881 zfs_dirent_unlock(dl
);
3885 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
3886 zil_commit(zilog
, 0);
3891 EXPORT_SYMBOL(zfs_symlink
);
3894 * Return, in the buffer contained in the provided uio structure,
3895 * the symbolic path referred to by ip.
3897 * IN: ip - inode of symbolic link
3898 * uio - structure to contain the link path.
3899 * cr - credentials of caller.
3901 * RETURN: 0 if success
3902 * error code if failure
3905 * ip - atime updated
3909 zfs_readlink(struct inode
*ip
, uio_t
*uio
, cred_t
*cr
)
3911 znode_t
*zp
= ITOZ(ip
);
3912 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
3918 mutex_enter(&zp
->z_lock
);
3920 error
= sa_lookup_uio(zp
->z_sa_hdl
,
3921 SA_ZPL_SYMLINK(zfsvfs
), uio
);
3923 error
= zfs_sa_readlink(zp
, uio
);
3924 mutex_exit(&zp
->z_lock
);
3929 EXPORT_SYMBOL(zfs_readlink
);
3932 * Insert a new entry into directory tdip referencing sip.
3934 * IN: tdip - Directory to contain new entry.
3935 * sip - inode of new entry.
3936 * name - name of new entry.
3937 * cr - credentials of caller.
3939 * RETURN: 0 if success
3940 * error code if failure
3943 * tdip - ctime|mtime updated
3944 * sip - ctime updated
3948 zfs_link(struct inode
*tdip
, struct inode
*sip
, char *name
, cred_t
*cr
,
3951 znode_t
*dzp
= ITOZ(tdip
);
3953 zfsvfs_t
*zfsvfs
= ITOZSB(tdip
);
3961 boolean_t waited
= B_FALSE
;
3962 boolean_t is_tmpfile
= 0;
3965 is_tmpfile
= (sip
->i_nlink
== 0 && (sip
->i_state
& I_LINKABLE
));
3967 ASSERT(S_ISDIR(tdip
->i_mode
));
3970 return (SET_ERROR(EINVAL
));
3974 zilog
= zfsvfs
->z_log
;
3977 * POSIX dictates that we return EPERM here.
3978 * Better choices include ENOTSUP or EISDIR.
3980 if (S_ISDIR(sip
->i_mode
)) {
3982 return (SET_ERROR(EPERM
));
3989 * We check i_sb because snapshots and the ctldir must have different
3992 if (sip
->i_sb
!= tdip
->i_sb
|| zfsctl_is_node(sip
)) {
3994 return (SET_ERROR(EXDEV
));
3997 /* Prevent links to .zfs/shares files */
3999 if ((error
= sa_lookup(szp
->z_sa_hdl
, SA_ZPL_PARENT(zfsvfs
),
4000 &parent
, sizeof (uint64_t))) != 0) {
4004 if (parent
== zfsvfs
->z_shares_dir
) {
4006 return (SET_ERROR(EPERM
));
4009 if (zfsvfs
->z_utf8
&& u8_validate(name
,
4010 strlen(name
), NULL
, U8_VALIDATE_ENTIRE
, &error
) < 0) {
4012 return (SET_ERROR(EILSEQ
));
4014 if (flags
& FIGNORECASE
)
4018 * We do not support links between attributes and non-attributes
4019 * because of the potential security risk of creating links
4020 * into "normal" file space in order to circumvent restrictions
4021 * imposed in attribute space.
4023 if ((szp
->z_pflags
& ZFS_XATTR
) != (dzp
->z_pflags
& ZFS_XATTR
)) {
4025 return (SET_ERROR(EINVAL
));
4028 owner
= zfs_fuid_map_id(zfsvfs
, KUID_TO_SUID(sip
->i_uid
),
4030 if (owner
!= crgetuid(cr
) && secpolicy_basic_link(cr
) != 0) {
4032 return (SET_ERROR(EPERM
));
4035 if ((error
= zfs_zaccess(dzp
, ACE_ADD_FILE
, 0, B_FALSE
, cr
))) {
4042 * Attempt to lock directory; fail if entry already exists.
4044 error
= zfs_dirent_lock(&dl
, dzp
, name
, &tzp
, zf
, NULL
, NULL
);
4050 tx
= dmu_tx_create(zfsvfs
->z_os
);
4051 dmu_tx_hold_sa(tx
, szp
->z_sa_hdl
, B_FALSE
);
4052 dmu_tx_hold_zap(tx
, dzp
->z_id
, TRUE
, name
);
4054 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, FALSE
, NULL
);
4056 zfs_sa_upgrade_txholds(tx
, szp
);
4057 zfs_sa_upgrade_txholds(tx
, dzp
);
4058 error
= dmu_tx_assign(tx
, waited
? TXG_WAITED
: TXG_NOWAIT
);
4060 zfs_dirent_unlock(dl
);
4061 if (error
== ERESTART
) {
4071 /* unmark z_unlinked so zfs_link_create will not reject */
4073 szp
->z_unlinked
= 0;
4074 error
= zfs_link_create(dl
, szp
, tx
, 0);
4077 uint64_t txtype
= TX_LINK
;
4079 * tmpfile is created to be in z_unlinkedobj, so remove it.
4080 * Also, we don't log in ZIL, be cause all previous file
4081 * operation on the tmpfile are ignored by ZIL. Instead we
4082 * always wait for txg to sync to make sure all previous
4083 * operation are sync safe.
4086 VERIFY(zap_remove_int(zfsvfs
->z_os
,
4087 zfsvfs
->z_unlinkedobj
, szp
->z_id
, tx
) == 0);
4089 if (flags
& FIGNORECASE
)
4091 zfs_log_link(zilog
, tx
, txtype
, dzp
, szp
, name
);
4093 } else if (is_tmpfile
) {
4094 /* restore z_unlinked since when linking failed */
4095 szp
->z_unlinked
= 1;
4097 txg
= dmu_tx_get_txg(tx
);
4100 zfs_dirent_unlock(dl
);
4102 if (!is_tmpfile
&& zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4103 zil_commit(zilog
, 0);
4106 txg_wait_synced(dmu_objset_pool(zfsvfs
->z_os
), txg
);
4108 zfs_inode_update(dzp
);
4109 zfs_inode_update(szp
);
4113 EXPORT_SYMBOL(zfs_link
);
4116 zfs_putpage_commit_cb(void *arg
)
4118 struct page
*pp
= arg
;
4121 end_page_writeback(pp
);
4125 * Push a page out to disk, once the page is on stable storage the
4126 * registered commit callback will be run as notification of completion.
4128 * IN: ip - page mapped for inode.
4129 * pp - page to push (page is locked)
4130 * wbc - writeback control data
4132 * RETURN: 0 if success
4133 * error code if failure
4136 * ip - ctime|mtime updated
4140 zfs_putpage(struct inode
*ip
, struct page
*pp
, struct writeback_control
*wbc
)
4142 znode_t
*zp
= ITOZ(ip
);
4143 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4151 uint64_t mtime
[2], ctime
[2];
4152 sa_bulk_attr_t bulk
[3];
4154 struct address_space
*mapping
;
4159 ASSERT(PageLocked(pp
));
4161 pgoff
= page_offset(pp
); /* Page byte-offset in file */
4162 offset
= i_size_read(ip
); /* File length in bytes */
4163 pglen
= MIN(PAGE_SIZE
, /* Page length in bytes */
4164 P2ROUNDUP(offset
, PAGE_SIZE
)-pgoff
);
4166 /* Page is beyond end of file */
4167 if (pgoff
>= offset
) {
4173 /* Truncate page length to end of file */
4174 if (pgoff
+ pglen
> offset
)
4175 pglen
= offset
- pgoff
;
4179 * FIXME: Allow mmap writes past its quota. The correct fix
4180 * is to register a page_mkwrite() handler to count the page
4181 * against its quota when it is about to be dirtied.
4183 if (zfs_owner_overquota(zfsvfs
, zp
, B_FALSE
) ||
4184 zfs_owner_overquota(zfsvfs
, zp
, B_TRUE
)) {
4190 * The ordering here is critical and must adhere to the following
4191 * rules in order to avoid deadlocking in either zfs_read() or
4192 * zfs_free_range() due to a lock inversion.
4194 * 1) The page must be unlocked prior to acquiring the range lock.
4195 * This is critical because zfs_read() calls find_lock_page()
4196 * which may block on the page lock while holding the range lock.
4198 * 2) Before setting or clearing write back on a page the range lock
4199 * must be held in order to prevent a lock inversion with the
4200 * zfs_free_range() function.
4202 * This presents a problem because upon entering this function the
4203 * page lock is already held. To safely acquire the range lock the
4204 * page lock must be dropped. This creates a window where another
4205 * process could truncate, invalidate, dirty, or write out the page.
4207 * Therefore, after successfully reacquiring the range and page locks
4208 * the current page state is checked. In the common case everything
4209 * will be as is expected and it can be written out. However, if
4210 * the page state has changed it must be handled accordingly.
4212 mapping
= pp
->mapping
;
4213 redirty_page_for_writepage(wbc
, pp
);
4216 rl
= zfs_range_lock(&zp
->z_range_lock
, pgoff
, pglen
, RL_WRITER
);
4219 /* Page mapping changed or it was no longer dirty, we're done */
4220 if (unlikely((mapping
!= pp
->mapping
) || !PageDirty(pp
))) {
4222 zfs_range_unlock(rl
);
4227 /* Another process started write block if required */
4228 if (PageWriteback(pp
)) {
4230 zfs_range_unlock(rl
);
4232 if (wbc
->sync_mode
!= WB_SYNC_NONE
)
4233 wait_on_page_writeback(pp
);
4239 /* Clear the dirty flag the required locks are held */
4240 if (!clear_page_dirty_for_io(pp
)) {
4242 zfs_range_unlock(rl
);
4248 * Counterpart for redirty_page_for_writepage() above. This page
4249 * was in fact not skipped and should not be counted as if it were.
4251 wbc
->pages_skipped
--;
4252 set_page_writeback(pp
);
4255 tx
= dmu_tx_create(zfsvfs
->z_os
);
4256 dmu_tx_hold_write(tx
, zp
->z_id
, pgoff
, pglen
);
4257 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4258 zfs_sa_upgrade_txholds(tx
, zp
);
4260 err
= dmu_tx_assign(tx
, TXG_NOWAIT
);
4262 if (err
== ERESTART
)
4266 __set_page_dirty_nobuffers(pp
);
4268 end_page_writeback(pp
);
4269 zfs_range_unlock(rl
);
4275 ASSERT3U(pglen
, <=, PAGE_SIZE
);
4276 dmu_write(zfsvfs
->z_os
, zp
->z_id
, pgoff
, pglen
, va
, tx
);
4279 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zfsvfs
), NULL
, &mtime
, 16);
4280 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zfsvfs
), NULL
, &ctime
, 16);
4281 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_FLAGS(zfsvfs
), NULL
,
4284 /* Preserve the mtime and ctime provided by the inode */
4285 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4286 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4287 zp
->z_atime_dirty
= 0;
4290 err
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4292 zfs_log_write(zfsvfs
->z_log
, tx
, TX_WRITE
, zp
, pgoff
, pglen
, 0,
4293 zfs_putpage_commit_cb
, pp
);
4296 zfs_range_unlock(rl
);
4298 if (wbc
->sync_mode
!= WB_SYNC_NONE
) {
4300 * Note that this is rarely called under writepages(), because
4301 * writepages() normally handles the entire commit for
4302 * performance reasons.
4304 zil_commit(zfsvfs
->z_log
, zp
->z_id
);
4312 * Update the system attributes when the inode has been dirtied. For the
4313 * moment we only update the mode, atime, mtime, and ctime.
4316 zfs_dirty_inode(struct inode
*ip
, int flags
)
4318 znode_t
*zp
= ITOZ(ip
);
4319 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4321 uint64_t mode
, atime
[2], mtime
[2], ctime
[2];
4322 sa_bulk_attr_t bulk
[4];
4326 if (zfs_is_readonly(zfsvfs
) || dmu_objset_is_snapshot(zfsvfs
->z_os
))
4334 * This is the lazytime semantic indroduced in Linux 4.0
4335 * This flag will only be called from update_time when lazytime is set.
4336 * (Note, I_DIRTY_SYNC will also set if not lazytime)
4337 * Fortunately mtime and ctime are managed within ZFS itself, so we
4338 * only need to dirty atime.
4340 if (flags
== I_DIRTY_TIME
) {
4341 zp
->z_atime_dirty
= 1;
4346 tx
= dmu_tx_create(zfsvfs
->z_os
);
4348 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4349 zfs_sa_upgrade_txholds(tx
, zp
);
4351 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4357 mutex_enter(&zp
->z_lock
);
4358 zp
->z_atime_dirty
= 0;
4360 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MODE(zfsvfs
), NULL
, &mode
, 8);
4361 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_ATIME(zfsvfs
), NULL
, &atime
, 16);
4362 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_MTIME(zfsvfs
), NULL
, &mtime
, 16);
4363 SA_ADD_BULK_ATTR(bulk
, cnt
, SA_ZPL_CTIME(zfsvfs
), NULL
, &ctime
, 16);
4365 /* Preserve the mode, mtime and ctime provided by the inode */
4366 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4367 ZFS_TIME_ENCODE(&ip
->i_mtime
, mtime
);
4368 ZFS_TIME_ENCODE(&ip
->i_ctime
, ctime
);
4373 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, cnt
, tx
);
4374 mutex_exit(&zp
->z_lock
);
4381 EXPORT_SYMBOL(zfs_dirty_inode
);
4385 zfs_inactive(struct inode
*ip
)
4387 znode_t
*zp
= ITOZ(ip
);
4388 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4391 int need_unlock
= 0;
4393 /* Only read lock if we haven't already write locked, e.g. rollback */
4394 if (!RW_WRITE_HELD(&zfsvfs
->z_teardown_inactive_lock
)) {
4396 rw_enter(&zfsvfs
->z_teardown_inactive_lock
, RW_READER
);
4398 if (zp
->z_sa_hdl
== NULL
) {
4400 rw_exit(&zfsvfs
->z_teardown_inactive_lock
);
4404 if (zp
->z_atime_dirty
&& zp
->z_unlinked
== 0) {
4405 dmu_tx_t
*tx
= dmu_tx_create(zfsvfs
->z_os
);
4407 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_FALSE
);
4408 zfs_sa_upgrade_txholds(tx
, zp
);
4409 error
= dmu_tx_assign(tx
, TXG_WAIT
);
4413 ZFS_TIME_ENCODE(&ip
->i_atime
, atime
);
4414 mutex_enter(&zp
->z_lock
);
4415 (void) sa_update(zp
->z_sa_hdl
, SA_ZPL_ATIME(zfsvfs
),
4416 (void *)&atime
, sizeof (atime
), tx
);
4417 zp
->z_atime_dirty
= 0;
4418 mutex_exit(&zp
->z_lock
);
4425 rw_exit(&zfsvfs
->z_teardown_inactive_lock
);
4427 EXPORT_SYMBOL(zfs_inactive
);
4430 * Bounds-check the seek operation.
4432 * IN: ip - inode seeking within
4433 * ooff - old file offset
4434 * noffp - pointer to new file offset
4435 * ct - caller context
4437 * RETURN: 0 if success
4438 * EINVAL if new offset invalid
4442 zfs_seek(struct inode
*ip
, offset_t ooff
, offset_t
*noffp
)
4444 if (S_ISDIR(ip
->i_mode
))
4446 return ((*noffp
< 0 || *noffp
> MAXOFFSET_T
) ? EINVAL
: 0);
4448 EXPORT_SYMBOL(zfs_seek
);
4451 * Fill pages with data from the disk.
4454 zfs_fillpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4456 znode_t
*zp
= ITOZ(ip
);
4457 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4459 struct page
*cur_pp
;
4460 u_offset_t io_off
, total
;
4467 io_len
= nr_pages
<< PAGE_SHIFT
;
4468 i_size
= i_size_read(ip
);
4469 io_off
= page_offset(pl
[0]);
4471 if (io_off
+ io_len
> i_size
)
4472 io_len
= i_size
- io_off
;
4475 * Iterate over list of pages and read each page individually.
4478 for (total
= io_off
+ io_len
; io_off
< total
; io_off
+= PAGESIZE
) {
4481 cur_pp
= pl
[page_idx
++];
4483 err
= dmu_read(os
, zp
->z_id
, io_off
, PAGESIZE
, va
,
4487 /* convert checksum errors into IO errors */
4489 err
= SET_ERROR(EIO
);
4498 * Uses zfs_fillpage to read data from the file and fill the pages.
4500 * IN: ip - inode of file to get data from.
4501 * pl - list of pages to read
4502 * nr_pages - number of pages to read
4504 * RETURN: 0 on success, error code on failure.
4507 * vp - atime updated
4511 zfs_getpage(struct inode
*ip
, struct page
*pl
[], int nr_pages
)
4513 znode_t
*zp
= ITOZ(ip
);
4514 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4523 err
= zfs_fillpage(ip
, pl
, nr_pages
);
4528 EXPORT_SYMBOL(zfs_getpage
);
4531 * Check ZFS specific permissions to memory map a section of a file.
4533 * IN: ip - inode of the file to mmap
4535 * addrp - start address in memory region
4536 * len - length of memory region
4537 * vm_flags- address flags
4539 * RETURN: 0 if success
4540 * error code if failure
4544 zfs_map(struct inode
*ip
, offset_t off
, caddr_t
*addrp
, size_t len
,
4545 unsigned long vm_flags
)
4547 znode_t
*zp
= ITOZ(ip
);
4548 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4553 if ((vm_flags
& VM_WRITE
) && (zp
->z_pflags
&
4554 (ZFS_IMMUTABLE
| ZFS_READONLY
| ZFS_APPENDONLY
))) {
4556 return (SET_ERROR(EPERM
));
4559 if ((vm_flags
& (VM_READ
| VM_EXEC
)) &&
4560 (zp
->z_pflags
& ZFS_AV_QUARANTINED
)) {
4562 return (SET_ERROR(EACCES
));
4565 if (off
< 0 || len
> MAXOFFSET_T
- off
) {
4567 return (SET_ERROR(ENXIO
));
4573 EXPORT_SYMBOL(zfs_map
);
4576 * convoff - converts the given data (start, whence) to the
4580 convoff(struct inode
*ip
, flock64_t
*lckdat
, int whence
, offset_t offset
)
4585 if ((lckdat
->l_whence
== 2) || (whence
== 2)) {
4586 if ((error
= zfs_getattr(ip
, &vap
, 0, CRED()) != 0))
4590 switch (lckdat
->l_whence
) {
4592 lckdat
->l_start
+= offset
;
4595 lckdat
->l_start
+= vap
.va_size
;
4600 return (SET_ERROR(EINVAL
));
4603 if (lckdat
->l_start
< 0)
4604 return (SET_ERROR(EINVAL
));
4608 lckdat
->l_start
-= offset
;
4611 lckdat
->l_start
-= vap
.va_size
;
4616 return (SET_ERROR(EINVAL
));
4619 lckdat
->l_whence
= (short)whence
;
4624 * Free or allocate space in a file. Currently, this function only
4625 * supports the `F_FREESP' command. However, this command is somewhat
4626 * misnamed, as its functionality includes the ability to allocate as
4627 * well as free space.
4629 * IN: ip - inode of file to free data in.
4630 * cmd - action to take (only F_FREESP supported).
4631 * bfp - section of file to free/alloc.
4632 * flag - current file open mode flags.
4633 * offset - current file offset.
4634 * cr - credentials of caller [UNUSED].
4636 * RETURN: 0 on success, error code on failure.
4639 * ip - ctime|mtime updated
4643 zfs_space(struct inode
*ip
, int cmd
, flock64_t
*bfp
, int flag
,
4644 offset_t offset
, cred_t
*cr
)
4646 znode_t
*zp
= ITOZ(ip
);
4647 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4654 if (cmd
!= F_FREESP
) {
4656 return (SET_ERROR(EINVAL
));
4660 * Callers might not be able to detect properly that we are read-only,
4661 * so check it explicitly here.
4663 if (zfs_is_readonly(zfsvfs
)) {
4665 return (SET_ERROR(EROFS
));
4668 if ((error
= convoff(ip
, bfp
, 0, offset
))) {
4673 if (bfp
->l_len
< 0) {
4675 return (SET_ERROR(EINVAL
));
4679 * Permissions aren't checked on Solaris because on this OS
4680 * zfs_space() can only be called with an opened file handle.
4681 * On Linux we can get here through truncate_range() which
4682 * operates directly on inodes, so we need to check access rights.
4684 if ((error
= zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
))) {
4690 len
= bfp
->l_len
; /* 0 means from off to end of file */
4692 error
= zfs_freesp(zp
, off
, len
, flag
, TRUE
);
4697 EXPORT_SYMBOL(zfs_space
);
4701 zfs_fid(struct inode
*ip
, fid_t
*fidp
)
4703 znode_t
*zp
= ITOZ(ip
);
4704 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4707 uint64_t object
= zp
->z_id
;
4714 if ((error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_GEN(zfsvfs
),
4715 &gen64
, sizeof (uint64_t))) != 0) {
4720 gen
= (uint32_t)gen64
;
4722 size
= SHORT_FID_LEN
;
4724 zfid
= (zfid_short_t
*)fidp
;
4726 zfid
->zf_len
= size
;
4728 for (i
= 0; i
< sizeof (zfid
->zf_object
); i
++)
4729 zfid
->zf_object
[i
] = (uint8_t)(object
>> (8 * i
));
4731 /* Must have a non-zero generation number to distinguish from .zfs */
4734 for (i
= 0; i
< sizeof (zfid
->zf_gen
); i
++)
4735 zfid
->zf_gen
[i
] = (uint8_t)(gen
>> (8 * i
));
4740 EXPORT_SYMBOL(zfs_fid
);
4744 zfs_getsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4746 znode_t
*zp
= ITOZ(ip
);
4747 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4749 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4753 error
= zfs_getacl(zp
, vsecp
, skipaclchk
, cr
);
4758 EXPORT_SYMBOL(zfs_getsecattr
);
4762 zfs_setsecattr(struct inode
*ip
, vsecattr_t
*vsecp
, int flag
, cred_t
*cr
)
4764 znode_t
*zp
= ITOZ(ip
);
4765 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4767 boolean_t skipaclchk
= (flag
& ATTR_NOACLCHECK
) ? B_TRUE
: B_FALSE
;
4768 zilog_t
*zilog
= zfsvfs
->z_log
;
4773 error
= zfs_setacl(zp
, vsecp
, skipaclchk
, cr
);
4775 if (zfsvfs
->z_os
->os_sync
== ZFS_SYNC_ALWAYS
)
4776 zil_commit(zilog
, 0);
4781 EXPORT_SYMBOL(zfs_setsecattr
);
4783 #ifdef HAVE_UIO_ZEROCOPY
4785 * Tunable, both must be a power of 2.
4787 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4788 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4789 * an arcbuf for a partial block read
4791 int zcr_blksz_min
= (1 << 10); /* 1K */
4792 int zcr_blksz_max
= (1 << 17); /* 128K */
4796 zfs_reqzcbuf(struct inode
*ip
, enum uio_rw ioflag
, xuio_t
*xuio
, cred_t
*cr
)
4798 znode_t
*zp
= ITOZ(ip
);
4799 zfsvfs_t
*zfsvfs
= ITOZSB(ip
);
4800 int max_blksz
= zfsvfs
->z_max_blksz
;
4801 uio_t
*uio
= &xuio
->xu_uio
;
4802 ssize_t size
= uio
->uio_resid
;
4803 offset_t offset
= uio
->uio_loffset
;
4808 int preamble
, postamble
;
4810 if (xuio
->xu_type
!= UIOTYPE_ZEROCOPY
)
4811 return (SET_ERROR(EINVAL
));
4818 * Loan out an arc_buf for write if write size is bigger than
4819 * max_blksz, and the file's block size is also max_blksz.
4822 if (size
< blksz
|| zp
->z_blksz
!= blksz
) {
4824 return (SET_ERROR(EINVAL
));
4827 * Caller requests buffers for write before knowing where the
4828 * write offset might be (e.g. NFS TCP write).
4833 preamble
= P2PHASE(offset
, blksz
);
4835 preamble
= blksz
- preamble
;
4840 postamble
= P2PHASE(size
, blksz
);
4843 fullblk
= size
/ blksz
;
4844 (void) dmu_xuio_init(xuio
,
4845 (preamble
!= 0) + fullblk
+ (postamble
!= 0));
4848 * Have to fix iov base/len for partial buffers. They
4849 * currently represent full arc_buf's.
4852 /* data begins in the middle of the arc_buf */
4853 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4856 (void) dmu_xuio_add(xuio
, abuf
,
4857 blksz
- preamble
, preamble
);
4860 for (i
= 0; i
< fullblk
; i
++) {
4861 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4864 (void) dmu_xuio_add(xuio
, abuf
, 0, blksz
);
4868 /* data ends in the middle of the arc_buf */
4869 abuf
= dmu_request_arcbuf(sa_get_db(zp
->z_sa_hdl
),
4872 (void) dmu_xuio_add(xuio
, abuf
, 0, postamble
);
4877 * Loan out an arc_buf for read if the read size is larger than
4878 * the current file block size. Block alignment is not
4879 * considered. Partial arc_buf will be loaned out for read.
4881 blksz
= zp
->z_blksz
;
4882 if (blksz
< zcr_blksz_min
)
4883 blksz
= zcr_blksz_min
;
4884 if (blksz
> zcr_blksz_max
)
4885 blksz
= zcr_blksz_max
;
4886 /* avoid potential complexity of dealing with it */
4887 if (blksz
> max_blksz
) {
4889 return (SET_ERROR(EINVAL
));
4892 maxsize
= zp
->z_size
- uio
->uio_loffset
;
4898 return (SET_ERROR(EINVAL
));
4903 return (SET_ERROR(EINVAL
));
4906 uio
->uio_extflg
= UIO_XUIO
;
4907 XUIO_XUZC_RW(xuio
) = ioflag
;
4914 zfs_retzcbuf(struct inode
*ip
, xuio_t
*xuio
, cred_t
*cr
)
4918 int ioflag
= XUIO_XUZC_RW(xuio
);
4920 ASSERT(xuio
->xu_type
== UIOTYPE_ZEROCOPY
);
4922 i
= dmu_xuio_cnt(xuio
);
4924 abuf
= dmu_xuio_arcbuf(xuio
, i
);
4926 * if abuf == NULL, it must be a write buffer
4927 * that has been returned in zfs_write().
4930 dmu_return_arcbuf(abuf
);
4931 ASSERT(abuf
|| ioflag
== UIO_WRITE
);
4934 dmu_xuio_fini(xuio
);
4937 #endif /* HAVE_UIO_ZEROCOPY */
4939 #if defined(_KERNEL) && defined(HAVE_SPL)
4941 module_param(zfs_delete_blocks
, ulong
, 0644);
4942 MODULE_PARM_DESC(zfs_delete_blocks
, "Delete files larger than N blocks async");
4943 module_param(zfs_read_chunk_size
, long, 0644);
4944 MODULE_PARM_DESC(zfs_read_chunk_size
, "Bytes to read per chunk");