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, 2018 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/sysmacros.h>
41 #include <sys/taskq.h>
43 #include <sys/vmsystm.h>
44 #include <sys/atomic.h>
45 #include <sys/pathname.h>
46 #include <sys/cmn_err.h>
47 #include <sys/errno.h>
48 #include <sys/zfs_dir.h>
49 #include <sys/zfs_acl.h>
50 #include <sys/zfs_ioctl.h>
51 #include <sys/fs/zfs.h>
53 #include <sys/dmu_objset.h>
59 #include <sys/policy.h>
60 #include <sys/sunddi.h>
63 #include <sys/zfs_ctldir.h>
64 #include <sys/zfs_fuid.h>
65 #include <sys/zfs_sa.h>
66 #include <sys/zfs_vnops.h>
67 #include <sys/zfs_rlock.h>
71 #include <sys/sa_impl.h>
76 * Each vnode op performs some logical unit of work. To do this, the ZPL must
77 * properly lock its in-core state, create a DMU transaction, do the work,
78 * record this work in the intent log (ZIL), commit the DMU transaction,
79 * and wait for the intent log to commit if it is a synchronous operation.
80 * Moreover, the vnode ops must work in both normal and log replay context.
81 * The ordering of events is important to avoid deadlocks and references
82 * to freed memory. The example below illustrates the following Big Rules:
84 * (1) A check must be made in each zfs thread for a mounted file system.
85 * This is done avoiding races using ZFS_ENTER(zfsvfs).
86 * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
87 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
88 * can return EIO from the calling function.
90 * (2) iput() should always be the last thing except for zil_commit()
91 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
92 * First, if it's the last reference, the vnode/znode
93 * can be freed, so the zp may point to freed memory. Second, the last
94 * reference will call zfs_zinactive(), which may induce a lot of work --
95 * pushing cached pages (which acquires range locks) and syncing out
96 * cached atime changes. Third, zfs_zinactive() may require a new tx,
97 * which could deadlock the system if you were already holding one.
98 * If you must call iput() within a tx then use zfs_iput_async().
100 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
101 * as they can span dmu_tx_assign() calls.
103 * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
104 * dmu_tx_assign(). This is critical because we don't want to block
105 * while holding locks.
107 * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
108 * reduces lock contention and CPU usage when we must wait (note that if
109 * throughput is constrained by the storage, nearly every transaction
112 * Note, in particular, that if a lock is sometimes acquired before
113 * the tx assigns, and sometimes after (e.g. z_lock), then failing
114 * to use a non-blocking assign can deadlock the system. The scenario:
116 * Thread A has grabbed a lock before calling dmu_tx_assign().
117 * Thread B is in an already-assigned tx, and blocks for this lock.
118 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
119 * forever, because the previous txg can't quiesce until B's tx commits.
121 * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT,
122 * then drop all locks, call dmu_tx_wait(), and try again. On subsequent
123 * calls to dmu_tx_assign(), pass TXG_NOTHROTTLE in addition to TXG_NOWAIT,
124 * to indicate that this operation has already called dmu_tx_wait().
125 * This will ensure that we don't retry forever, waiting a short bit
128 * (5) If the operation succeeded, generate the intent log entry for it
129 * before dropping locks. This ensures that the ordering of events
130 * in the intent log matches the order in which they actually occurred.
131 * During ZIL replay the zfs_log_* functions will update the sequence
132 * number to indicate the zil transaction has replayed.
134 * (6) At the end of each vnode op, the DMU tx must always commit,
135 * regardless of whether there were any errors.
137 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
138 * to ensure that synchronous semantics are provided when necessary.
140 * In general, this is how things should be ordered in each vnode op:
142 * ZFS_ENTER(zfsvfs); // exit if unmounted
144 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
145 * rw_enter(...); // grab any other locks you need
146 * tx = dmu_tx_create(...); // get DMU tx
147 * dmu_tx_hold_*(); // hold each object you might modify
148 * error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
150 * rw_exit(...); // drop locks
151 * zfs_dirent_unlock(dl); // unlock directory entry
152 * iput(...); // release held vnodes
153 * if (error == ERESTART) {
159 * dmu_tx_abort(tx); // abort DMU tx
160 * ZFS_EXIT(zfsvfs); // finished in zfs
161 * return (error); // really out of space
163 * error = do_real_work(); // do whatever this VOP does
165 * zfs_log_*(...); // on success, make ZIL entry
166 * dmu_tx_commit(tx); // commit DMU tx -- error or not
167 * rw_exit(...); // drop locks
168 * zfs_dirent_unlock(dl); // unlock directory entry
169 * iput(...); // release held vnodes
170 * zil_commit(zilog, foid); // synchronous when necessary
171 * ZFS_EXIT(zfsvfs); // finished in zfs
172 * return (error); // done, report error
176 * Virus scanning is unsupported. It would be possible to add a hook
177 * here to performance the required virus scan. This could be done
178 * entirely in the kernel or potentially as an update to invoke a
182 zfs_vscan(struct inode *ip, cred_t *cr, int async)
189 zfs_open(struct inode *ip, int mode, int flag, cred_t *cr)
191 znode_t *zp = ITOZ(ip);
192 zfsvfs_t *zfsvfs = ITOZSB(ip);
197 /* Honor ZFS_APPENDONLY file attribute */
198 if ((mode & FMODE_WRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
199 ((flag & O_APPEND) == 0)) {
201 return (SET_ERROR(EPERM));
204 /* Virus scan eligible files on open */
205 if (!zfs_has_ctldir(zp) && zfsvfs->z_vscan && S_ISREG(ip->i_mode) &&
206 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
207 if (zfs_vscan(ip, cr, 0) != 0) {
209 return (SET_ERROR(EACCES));
213 /* Keep a count of the synchronous opens in the znode */
215 atomic_inc_32(&zp->z_sync_cnt);
223 zfs_close(struct inode *ip, int flag, cred_t *cr)
225 znode_t *zp = ITOZ(ip);
226 zfsvfs_t *zfsvfs = ITOZSB(ip);
231 /* Decrement the synchronous opens in the znode */
233 atomic_dec_32(&zp->z_sync_cnt);
235 if (!zfs_has_ctldir(zp) && zfsvfs->z_vscan && S_ISREG(ip->i_mode) &&
236 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
237 VERIFY(zfs_vscan(ip, cr, 1) == 0);
243 #if defined(SEEK_HOLE) && defined(SEEK_DATA)
245 * Lseek support for finding holes (cmd == SEEK_HOLE) and
246 * data (cmd == SEEK_DATA). "off" is an in/out parameter.
249 zfs_holey_common(struct inode *ip, int cmd, loff_t *off)
251 znode_t *zp = ITOZ(ip);
252 uint64_t noff = (uint64_t)*off; /* new offset */
257 file_sz = zp->z_size;
258 if (noff >= file_sz) {
259 return (SET_ERROR(ENXIO));
262 if (cmd == SEEK_HOLE)
267 error = dmu_offset_next(ZTOZSB(zp)->z_os, zp->z_id, hole, &noff);
270 return (SET_ERROR(ENXIO));
272 /* file was dirty, so fall back to using generic logic */
273 if (error == EBUSY) {
281 * We could find a hole that begins after the logical end-of-file,
282 * because dmu_offset_next() only works on whole blocks. If the
283 * EOF falls mid-block, then indicate that the "virtual hole"
284 * at the end of the file begins at the logical EOF, rather than
285 * at the end of the last block.
287 if (noff > file_sz) {
299 zfs_holey(struct inode *ip, int cmd, loff_t *off)
301 znode_t *zp = ITOZ(ip);
302 zfsvfs_t *zfsvfs = ITOZSB(ip);
308 error = zfs_holey_common(ip, cmd, off);
313 #endif /* SEEK_HOLE && SEEK_DATA */
317 * When a file is memory mapped, we must keep the IO data synchronized
318 * between the DMU cache and the memory mapped pages. What this means:
320 * On Write: If we find a memory mapped page, we write to *both*
321 * the page and the dmu buffer.
324 update_pages(struct inode *ip, int64_t start, int len,
325 objset_t *os, uint64_t oid)
327 struct address_space *mp = ip->i_mapping;
333 off = start & (PAGE_SIZE-1);
334 for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
335 nbytes = MIN(PAGE_SIZE - off, len);
337 pp = find_lock_page(mp, start >> PAGE_SHIFT);
339 if (mapping_writably_mapped(mp))
340 flush_dcache_page(pp);
343 (void) dmu_read(os, oid, start+off, nbytes, pb+off,
347 if (mapping_writably_mapped(mp))
348 flush_dcache_page(pp);
350 mark_page_accessed(pp);
363 * When a file is memory mapped, we must keep the IO data synchronized
364 * between the DMU cache and the memory mapped pages. What this means:
366 * On Read: We "read" preferentially from memory mapped pages,
367 * else we default from the dmu buffer.
369 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
370 * the file is memory mapped.
373 mappedread(struct inode *ip, int nbytes, uio_t *uio)
375 struct address_space *mp = ip->i_mapping;
377 znode_t *zp = ITOZ(ip);
384 start = uio->uio_loffset;
385 off = start & (PAGE_SIZE-1);
386 for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
387 bytes = MIN(PAGE_SIZE - off, len);
389 pp = find_lock_page(mp, start >> PAGE_SHIFT);
391 ASSERT(PageUptodate(pp));
395 error = uiomove(pb + off, bytes, UIO_READ, uio);
398 if (mapping_writably_mapped(mp))
399 flush_dcache_page(pp);
401 mark_page_accessed(pp);
404 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
417 unsigned long zfs_read_chunk_size = 1024 * 1024; /* Tunable */
418 unsigned long zfs_delete_blocks = DMU_MAX_DELETEBLKCNT;
421 * Read bytes from specified file into supplied buffer.
423 * IN: ip - inode of file to be read from.
424 * uio - structure supplying read location, range info,
426 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
427 * O_DIRECT flag; used to bypass page cache.
428 * cr - credentials of caller.
430 * OUT: uio - updated offset and range, buffer filled.
432 * RETURN: 0 on success, error code on failure.
435 * inode - atime updated if byte count > 0
439 zfs_read(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
443 znode_t *zp = ITOZ(ip);
444 zfsvfs_t *zfsvfs = ITOZSB(ip);
448 if (zp->z_pflags & ZFS_AV_QUARANTINED) {
450 return (SET_ERROR(EACCES));
454 * Validate file offset
456 if (uio->uio_loffset < (offset_t)0) {
458 return (SET_ERROR(EINVAL));
462 * Fasttrack empty reads
464 if (uio->uio_resid == 0) {
470 * If we're in FRSYNC mode, sync out this znode before reading it.
471 * Only do this for non-snapshots.
474 (ioflag & FRSYNC || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS))
475 zil_commit(zfsvfs->z_log, zp->z_id);
478 * Lock the range against changes.
480 locked_range_t *lr = rangelock_enter(&zp->z_rangelock,
481 uio->uio_loffset, uio->uio_resid, RL_READER);
484 * If we are reading past end-of-file we can skip
485 * to the end; but we might still need to set atime.
487 if (uio->uio_loffset >= zp->z_size) {
492 ASSERT(uio->uio_loffset < zp->z_size);
493 ssize_t n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset);
494 ssize_t start_resid = n;
496 #ifdef HAVE_UIO_ZEROCOPY
498 if ((uio->uio_extflg == UIO_XUIO) &&
499 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) {
501 int blksz = zp->z_blksz;
502 uint64_t offset = uio->uio_loffset;
504 xuio = (xuio_t *)uio;
506 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset,
509 ASSERT(offset + n <= blksz);
512 (void) dmu_xuio_init(xuio, nblk);
514 if (vn_has_cached_data(ip)) {
516 * For simplicity, we always allocate a full buffer
517 * even if we only expect to read a portion of a block.
519 while (--nblk >= 0) {
520 (void) dmu_xuio_add(xuio,
521 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
526 #endif /* HAVE_UIO_ZEROCOPY */
529 ssize_t nbytes = MIN(n, zfs_read_chunk_size -
530 P2PHASE(uio->uio_loffset, zfs_read_chunk_size));
532 if (zp->z_is_mapped && !(ioflag & O_DIRECT)) {
533 error = mappedread(ip, nbytes, uio);
535 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
540 /* convert checksum errors into IO errors */
542 error = SET_ERROR(EIO);
549 int64_t nread = start_resid - n;
550 dataset_kstats_update_read_kstats(&zfsvfs->z_kstat, nread);
551 task_io_account_read(nread);
560 * Write the bytes to a file.
562 * IN: ip - inode of file to be written to.
563 * uio - structure supplying write location, range info,
565 * ioflag - FAPPEND flag set if in append mode.
566 * O_DIRECT flag; used to bypass page cache.
567 * cr - credentials of caller.
569 * OUT: uio - updated offset and range.
571 * RETURN: 0 if success
572 * error code if failure
575 * ip - ctime|mtime updated if byte count > 0
580 zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
583 ssize_t start_resid = uio->uio_resid;
586 * Fasttrack empty write
588 ssize_t n = start_resid;
592 rlim64_t limit = uio->uio_limit;
593 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
596 znode_t *zp = ITOZ(ip);
597 zfsvfs_t *zfsvfs = ZTOZSB(zp);
601 sa_bulk_attr_t bulk[4];
603 uint64_t mtime[2], ctime[2];
604 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
605 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
606 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
608 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
612 * Callers might not be able to detect properly that we are read-only,
613 * so check it explicitly here.
615 if (zfs_is_readonly(zfsvfs)) {
617 return (SET_ERROR(EROFS));
621 * If immutable or not appending then return EPERM
623 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
624 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) &&
625 (uio->uio_loffset < zp->z_size))) {
627 return (SET_ERROR(EPERM));
631 * Validate file offset
633 offset_t woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset;
636 return (SET_ERROR(EINVAL));
639 int max_blksz = zfsvfs->z_max_blksz;
643 * Pre-fault the pages to ensure slow (eg NFS) pages
645 * Skip this if uio contains loaned arc_buf.
647 #ifdef HAVE_UIO_ZEROCOPY
648 if ((uio->uio_extflg == UIO_XUIO) &&
649 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY))
650 xuio = (xuio_t *)uio;
653 if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
655 return (SET_ERROR(EFAULT));
659 * If in append mode, set the io offset pointer to eof.
662 if (ioflag & FAPPEND) {
664 * Obtain an appending range lock to guarantee file append
665 * semantics. We reset the write offset once we have the lock.
667 lr = rangelock_enter(&zp->z_rangelock, 0, n, RL_APPEND);
668 woff = lr->lr_offset;
669 if (lr->lr_length == UINT64_MAX) {
671 * We overlocked the file because this write will cause
672 * the file block size to increase.
673 * Note that zp_size cannot change with this lock held.
677 uio->uio_loffset = woff;
680 * Note that if the file block size will change as a result of
681 * this write, then this range lock will lock the entire file
682 * so that we can re-write the block safely.
684 lr = rangelock_enter(&zp->z_rangelock, woff, n, RL_WRITER);
690 return (SET_ERROR(EFBIG));
693 if ((woff + n) > limit || woff > (limit - n))
696 /* Will this write extend the file length? */
697 int write_eof = (woff + n > zp->z_size);
699 uint64_t end_size = MAX(zp->z_size, woff + n);
700 zilog_t *zilog = zfsvfs->z_log;
701 #ifdef HAVE_UIO_ZEROCOPY
703 const iovec_t *iovp = uio->uio_iov;
704 ASSERTV(int iovcnt = uio->uio_iovcnt);
709 * Write the file in reasonable size chunks. Each chunk is written
710 * in a separate transaction; this keeps the intent log records small
711 * and allows us to do more fine-grained space accounting.
714 woff = uio->uio_loffset;
716 if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT,
717 KUID_TO_SUID(ip->i_uid)) ||
718 zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT,
719 KGID_TO_SGID(ip->i_gid)) ||
720 (zp->z_projid != ZFS_DEFAULT_PROJID &&
721 zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT,
723 error = SET_ERROR(EDQUOT);
727 arc_buf_t *abuf = NULL;
728 const iovec_t *aiov = NULL;
730 #ifdef HAVE_UIO_ZEROCOPY
731 ASSERT(i_iov < iovcnt);
732 ASSERT3U(uio->uio_segflg, !=, UIO_BVEC);
734 abuf = dmu_xuio_arcbuf(xuio, i_iov);
735 dmu_xuio_clear(xuio, i_iov);
736 ASSERT((aiov->iov_base == abuf->b_data) ||
737 ((char *)aiov->iov_base - (char *)abuf->b_data +
738 aiov->iov_len == arc_buf_size(abuf)));
741 } else if (n >= max_blksz && woff >= zp->z_size &&
742 P2PHASE(woff, max_blksz) == 0 &&
743 zp->z_blksz == max_blksz) {
745 * This write covers a full block. "Borrow" a buffer
746 * from the dmu so that we can fill it before we enter
747 * a transaction. This avoids the possibility of
748 * holding up the transaction if the data copy hangs
749 * up on a pagefault (e.g., from an NFS server mapping).
753 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
755 ASSERT(abuf != NULL);
756 ASSERT(arc_buf_size(abuf) == max_blksz);
757 if ((error = uiocopy(abuf->b_data, max_blksz,
758 UIO_WRITE, uio, &cbytes))) {
759 dmu_return_arcbuf(abuf);
762 ASSERT(cbytes == max_blksz);
766 * Start a transaction.
768 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);
769 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
770 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz));
771 zfs_sa_upgrade_txholds(tx, zp);
772 error = dmu_tx_assign(tx, TXG_WAIT);
776 dmu_return_arcbuf(abuf);
781 * If rangelock_enter() over-locked we grow the blocksize
782 * and then reduce the lock range. This will only happen
783 * on the first iteration since rangelock_reduce() will
784 * shrink down lr_length to the appropriate size.
786 if (lr->lr_length == UINT64_MAX) {
789 if (zp->z_blksz > max_blksz) {
791 * File's blocksize is already larger than the
792 * "recordsize" property. Only let it grow to
793 * the next power of 2.
795 ASSERT(!ISP2(zp->z_blksz));
796 new_blksz = MIN(end_size,
797 1 << highbit64(zp->z_blksz));
799 new_blksz = MIN(end_size, max_blksz);
801 zfs_grow_blocksize(zp, new_blksz, tx);
802 rangelock_reduce(lr, woff, n);
806 * XXX - should we really limit each write to z_max_blksz?
807 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
809 ssize_t nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz));
813 tx_bytes = uio->uio_resid;
814 uio->uio_fault_disable = B_TRUE;
815 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
817 if (error == EFAULT) {
819 if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
823 } else if (error != 0) {
827 tx_bytes -= uio->uio_resid;
830 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len);
832 * If this is not a full block write, but we are
833 * extending the file past EOF and this data starts
834 * block-aligned, use assign_arcbuf(). Otherwise,
835 * write via dmu_write().
837 if (tx_bytes < max_blksz && (!write_eof ||
838 aiov->iov_base != abuf->b_data)) {
840 dmu_write(zfsvfs->z_os, zp->z_id, woff,
841 /* cppcheck-suppress nullPointer */
842 aiov->iov_len, aiov->iov_base, tx);
843 dmu_return_arcbuf(abuf);
844 xuio_stat_wbuf_copied();
846 ASSERT(xuio || tx_bytes == max_blksz);
847 dmu_assign_arcbuf_by_dbuf(
848 sa_get_db(zp->z_sa_hdl), woff, abuf, tx);
850 ASSERT(tx_bytes <= uio->uio_resid);
851 uioskip(uio, tx_bytes);
853 if (tx_bytes && zp->z_is_mapped && !(ioflag & O_DIRECT)) {
854 update_pages(ip, woff,
855 tx_bytes, zfsvfs->z_os, zp->z_id);
859 * If we made no progress, we're done. If we made even
860 * partial progress, update the znode and ZIL accordingly.
863 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
864 (void *)&zp->z_size, sizeof (uint64_t), tx);
871 * Clear Set-UID/Set-GID bits on successful write if not
872 * privileged and at least one of the execute bits is set.
874 * It would be nice to to this after all writes have
875 * been done, but that would still expose the ISUID/ISGID
876 * to another app after the partial write is committed.
878 * Note: we don't call zfs_fuid_map_id() here because
879 * user 0 is not an ephemeral uid.
881 mutex_enter(&zp->z_acl_lock);
882 uint32_t uid = KUID_TO_SUID(ip->i_uid);
883 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) |
884 (S_IXUSR >> 6))) != 0 &&
885 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 &&
886 secpolicy_vnode_setid_retain(cr,
887 ((zp->z_mode & S_ISUID) != 0 && uid == 0)) != 0) {
889 zp->z_mode &= ~(S_ISUID | S_ISGID);
890 ip->i_mode = newmode = zp->z_mode;
891 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs),
892 (void *)&newmode, sizeof (uint64_t), tx);
894 mutex_exit(&zp->z_acl_lock);
896 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
899 * Update the file size (zp_size) if it has changed;
900 * account for possible concurrent updates.
902 while ((end_size = zp->z_size) < uio->uio_loffset) {
903 (void) atomic_cas_64(&zp->z_size, end_size,
908 * If we are replaying and eof is non zero then force
909 * the file size to the specified eof. Note, there's no
910 * concurrency during replay.
912 if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
913 zp->z_size = zfsvfs->z_replay_eof;
915 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
917 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag,
923 ASSERT(tx_bytes == nbytes);
926 if (!xuio && n > 0) {
927 if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
934 zfs_inode_update(zp);
938 * If we're in replay mode, or we made no progress, return error.
939 * Otherwise, it's at least a partial write, so it's successful.
941 if (zfsvfs->z_replay || uio->uio_resid == start_resid) {
946 if (ioflag & (FSYNC | FDSYNC) ||
947 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
948 zil_commit(zilog, zp->z_id);
950 int64_t nwritten = start_resid - uio->uio_resid;
951 dataset_kstats_update_write_kstats(&zfsvfs->z_kstat, nwritten);
952 task_io_account_write(nwritten);
959 * Drop a reference on the passed inode asynchronously. This ensures
960 * that the caller will never drop the last reference on an inode in
961 * the current context. Doing so while holding open a tx could result
962 * in a deadlock if iput_final() re-enters the filesystem code.
965 zfs_iput_async(struct inode *ip)
967 objset_t *os = ITOZSB(ip)->z_os;
969 ASSERT(atomic_read(&ip->i_count) > 0);
972 if (atomic_read(&ip->i_count) == 1)
973 VERIFY(taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os)),
974 (task_func_t *)iput, ip, TQ_SLEEP) != TASKQID_INVALID);
981 zfs_get_done(zgd_t *zgd, int error)
983 znode_t *zp = zgd->zgd_private;
986 dmu_buf_rele(zgd->zgd_db, zgd);
988 rangelock_exit(zgd->zgd_lr);
991 * Release the vnode asynchronously as we currently have the
992 * txg stopped from syncing.
994 zfs_iput_async(ZTOI(zp));
996 kmem_free(zgd, sizeof (zgd_t));
1000 static int zil_fault_io = 0;
1004 * Get data to generate a TX_WRITE intent log record.
1007 zfs_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio)
1009 zfsvfs_t *zfsvfs = arg;
1010 objset_t *os = zfsvfs->z_os;
1012 uint64_t object = lr->lr_foid;
1013 uint64_t offset = lr->lr_offset;
1014 uint64_t size = lr->lr_length;
1019 ASSERT3P(lwb, !=, NULL);
1020 ASSERT3P(zio, !=, NULL);
1021 ASSERT3U(size, !=, 0);
1024 * Nothing to do if the file has been removed
1026 if (zfs_zget(zfsvfs, object, &zp) != 0)
1027 return (SET_ERROR(ENOENT));
1028 if (zp->z_unlinked) {
1030 * Release the vnode asynchronously as we currently have the
1031 * txg stopped from syncing.
1033 zfs_iput_async(ZTOI(zp));
1034 return (SET_ERROR(ENOENT));
1037 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1039 zgd->zgd_private = zp;
1042 * Write records come in two flavors: immediate and indirect.
1043 * For small writes it's cheaper to store the data with the
1044 * log record (immediate); for large writes it's cheaper to
1045 * sync the data and get a pointer to it (indirect) so that
1046 * we don't have to write the data twice.
1048 if (buf != NULL) { /* immediate write */
1049 zgd->zgd_lr = rangelock_enter(&zp->z_rangelock,
1050 offset, size, RL_READER);
1051 /* test for truncation needs to be done while range locked */
1052 if (offset >= zp->z_size) {
1053 error = SET_ERROR(ENOENT);
1055 error = dmu_read(os, object, offset, size, buf,
1056 DMU_READ_NO_PREFETCH);
1058 ASSERT(error == 0 || error == ENOENT);
1059 } else { /* indirect write */
1061 * Have to lock the whole block to ensure when it's
1062 * written out and its checksum is being calculated
1063 * that no one can change the data. We need to re-check
1064 * blocksize after we get the lock in case it's changed!
1069 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset;
1071 zgd->zgd_lr = rangelock_enter(&zp->z_rangelock,
1072 offset, size, RL_READER);
1073 if (zp->z_blksz == size)
1076 rangelock_exit(zgd->zgd_lr);
1078 /* test for truncation needs to be done while range locked */
1079 if (lr->lr_offset >= zp->z_size)
1080 error = SET_ERROR(ENOENT);
1083 error = SET_ERROR(EIO);
1088 error = dmu_buf_hold(os, object, offset, zgd, &db,
1089 DMU_READ_NO_PREFETCH);
1092 blkptr_t *bp = &lr->lr_blkptr;
1097 ASSERT(db->db_offset == offset);
1098 ASSERT(db->db_size == size);
1100 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1102 ASSERT(error || lr->lr_length <= size);
1105 * On success, we need to wait for the write I/O
1106 * initiated by dmu_sync() to complete before we can
1107 * release this dbuf. We will finish everything up
1108 * in the zfs_get_done() callback.
1113 if (error == EALREADY) {
1114 lr->lr_common.lrc_txtype = TX_WRITE2;
1116 * TX_WRITE2 relies on the data previously
1117 * written by the TX_WRITE that caused
1118 * EALREADY. We zero out the BP because
1119 * it is the old, currently-on-disk BP.
1128 zfs_get_done(zgd, error);
1135 zfs_access(struct inode *ip, int mode, int flag, cred_t *cr)
1137 znode_t *zp = ITOZ(ip);
1138 zfsvfs_t *zfsvfs = ITOZSB(ip);
1144 if (flag & V_ACE_MASK)
1145 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
1147 error = zfs_zaccess_rwx(zp, mode, flag, cr);
1154 * Lookup an entry in a directory, or an extended attribute directory.
1155 * If it exists, return a held inode reference for it.
1157 * IN: dip - inode of directory to search.
1158 * nm - name of entry to lookup.
1159 * flags - LOOKUP_XATTR set if looking for an attribute.
1160 * cr - credentials of caller.
1161 * direntflags - directory lookup flags
1162 * realpnp - returned pathname.
1164 * OUT: ipp - inode of located entry, NULL if not found.
1166 * RETURN: 0 on success, error code on failure.
1173 zfs_lookup(struct inode *dip, char *nm, struct inode **ipp, int flags,
1174 cred_t *cr, int *direntflags, pathname_t *realpnp)
1176 znode_t *zdp = ITOZ(dip);
1177 zfsvfs_t *zfsvfs = ITOZSB(dip);
1181 * Fast path lookup, however we must skip DNLC lookup
1182 * for case folding or normalizing lookups because the
1183 * DNLC code only stores the passed in name. This means
1184 * creating 'a' and removing 'A' on a case insensitive
1185 * file system would work, but DNLC still thinks 'a'
1186 * exists and won't let you create it again on the next
1187 * pass through fast path.
1189 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
1191 if (!S_ISDIR(dip->i_mode)) {
1192 return (SET_ERROR(ENOTDIR));
1193 } else if (zdp->z_sa_hdl == NULL) {
1194 return (SET_ERROR(EIO));
1197 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
1198 error = zfs_fastaccesschk_execute(zdp, cr);
1213 if (flags & LOOKUP_XATTR) {
1215 * We don't allow recursive attributes..
1216 * Maybe someday we will.
1218 if (zdp->z_pflags & ZFS_XATTR) {
1220 return (SET_ERROR(EINVAL));
1223 if ((error = zfs_get_xattrdir(zdp, ipp, cr, flags))) {
1229 * Do we have permission to get into attribute directory?
1232 if ((error = zfs_zaccess(ITOZ(*ipp), ACE_EXECUTE, 0,
1242 if (!S_ISDIR(dip->i_mode)) {
1244 return (SET_ERROR(ENOTDIR));
1248 * Check accessibility of directory.
1251 if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr))) {
1256 if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
1257 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1259 return (SET_ERROR(EILSEQ));
1262 error = zfs_dirlook(zdp, nm, ipp, flags, direntflags, realpnp);
1263 if ((error == 0) && (*ipp))
1264 zfs_inode_update(ITOZ(*ipp));
1271 * Attempt to create a new entry in a directory. If the entry
1272 * already exists, truncate the file if permissible, else return
1273 * an error. Return the ip of the created or trunc'd file.
1275 * IN: dip - inode of directory to put new file entry in.
1276 * name - name of new file entry.
1277 * vap - attributes of new file.
1278 * excl - flag indicating exclusive or non-exclusive mode.
1279 * mode - mode to open file with.
1280 * cr - credentials of caller.
1281 * flag - large file flag [UNUSED].
1282 * vsecp - ACL to be set
1284 * OUT: ipp - inode of created or trunc'd entry.
1286 * RETURN: 0 on success, error code on failure.
1289 * dip - ctime|mtime updated if new entry created
1290 * ip - ctime|mtime always, atime if new
1295 zfs_create(struct inode *dip, char *name, vattr_t *vap, int excl,
1296 int mode, struct inode **ipp, cred_t *cr, int flag, vsecattr_t *vsecp)
1298 znode_t *zp, *dzp = ITOZ(dip);
1299 zfsvfs_t *zfsvfs = ITOZSB(dip);
1307 zfs_acl_ids_t acl_ids;
1308 boolean_t fuid_dirtied;
1309 boolean_t have_acl = B_FALSE;
1310 boolean_t waited = B_FALSE;
1313 * If we have an ephemeral id, ACL, or XVATTR then
1314 * make sure file system is at proper version
1320 if (zfsvfs->z_use_fuids == B_FALSE &&
1321 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1322 return (SET_ERROR(EINVAL));
1325 return (SET_ERROR(EINVAL));
1330 zilog = zfsvfs->z_log;
1332 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
1333 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1335 return (SET_ERROR(EILSEQ));
1338 if (vap->va_mask & ATTR_XVATTR) {
1339 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1340 crgetuid(cr), cr, vap->va_mode)) != 0) {
1348 if (*name == '\0') {
1350 * Null component name refers to the directory itself.
1357 /* possible igrab(zp) */
1360 if (flag & FIGNORECASE)
1363 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1367 zfs_acl_ids_free(&acl_ids);
1368 if (strcmp(name, "..") == 0)
1369 error = SET_ERROR(EISDIR);
1377 uint64_t projid = ZFS_DEFAULT_PROJID;
1380 * Create a new file object and update the directory
1383 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
1385 zfs_acl_ids_free(&acl_ids);
1390 * We only support the creation of regular files in
1391 * extended attribute directories.
1394 if ((dzp->z_pflags & ZFS_XATTR) && !S_ISREG(vap->va_mode)) {
1396 zfs_acl_ids_free(&acl_ids);
1397 error = SET_ERROR(EINVAL);
1401 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1402 cr, vsecp, &acl_ids)) != 0)
1406 if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode))
1407 projid = zfs_inherit_projid(dzp);
1408 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
1409 zfs_acl_ids_free(&acl_ids);
1410 error = SET_ERROR(EDQUOT);
1414 tx = dmu_tx_create(os);
1416 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1417 ZFS_SA_BASE_ATTR_SIZE);
1419 fuid_dirtied = zfsvfs->z_fuid_dirty;
1421 zfs_fuid_txhold(zfsvfs, tx);
1422 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
1423 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
1424 if (!zfsvfs->z_use_sa &&
1425 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1426 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1427 0, acl_ids.z_aclp->z_acl_bytes);
1430 error = dmu_tx_assign(tx,
1431 (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
1433 zfs_dirent_unlock(dl);
1434 if (error == ERESTART) {
1440 zfs_acl_ids_free(&acl_ids);
1445 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1447 error = zfs_link_create(dl, zp, tx, ZNEW);
1450 * Since, we failed to add the directory entry for it,
1451 * delete the newly created dnode.
1453 zfs_znode_delete(zp, tx);
1454 remove_inode_hash(ZTOI(zp));
1455 zfs_acl_ids_free(&acl_ids);
1461 zfs_fuid_sync(zfsvfs, tx);
1463 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
1464 if (flag & FIGNORECASE)
1466 zfs_log_create(zilog, tx, txtype, dzp, zp, name,
1467 vsecp, acl_ids.z_fuidp, vap);
1468 zfs_acl_ids_free(&acl_ids);
1471 int aflags = (flag & FAPPEND) ? V_APPEND : 0;
1474 zfs_acl_ids_free(&acl_ids);
1478 * A directory entry already exists for this name.
1481 * Can't truncate an existing file if in exclusive mode.
1484 error = SET_ERROR(EEXIST);
1488 * Can't open a directory for writing.
1490 if (S_ISDIR(ZTOI(zp)->i_mode)) {
1491 error = SET_ERROR(EISDIR);
1495 * Verify requested access to file.
1497 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
1501 mutex_enter(&dzp->z_lock);
1503 mutex_exit(&dzp->z_lock);
1506 * Truncate regular files if requested.
1508 if (S_ISREG(ZTOI(zp)->i_mode) &&
1509 (vap->va_mask & ATTR_SIZE) && (vap->va_size == 0)) {
1510 /* we can't hold any locks when calling zfs_freesp() */
1512 zfs_dirent_unlock(dl);
1515 error = zfs_freesp(zp, 0, 0, mode, TRUE);
1521 zfs_dirent_unlock(dl);
1527 zfs_inode_update(dzp);
1528 zfs_inode_update(zp);
1532 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1533 zil_commit(zilog, 0);
1541 zfs_tmpfile(struct inode *dip, vattr_t *vap, int excl,
1542 int mode, struct inode **ipp, cred_t *cr, int flag, vsecattr_t *vsecp)
1544 znode_t *zp = NULL, *dzp = ITOZ(dip);
1545 zfsvfs_t *zfsvfs = ITOZSB(dip);
1551 zfs_acl_ids_t acl_ids;
1552 uint64_t projid = ZFS_DEFAULT_PROJID;
1553 boolean_t fuid_dirtied;
1554 boolean_t have_acl = B_FALSE;
1555 boolean_t waited = B_FALSE;
1558 * If we have an ephemeral id, ACL, or XVATTR then
1559 * make sure file system is at proper version
1565 if (zfsvfs->z_use_fuids == B_FALSE &&
1566 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1567 return (SET_ERROR(EINVAL));
1573 if (vap->va_mask & ATTR_XVATTR) {
1574 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1575 crgetuid(cr), cr, vap->va_mode)) != 0) {
1585 * Create a new file object and update the directory
1588 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
1590 zfs_acl_ids_free(&acl_ids);
1594 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1595 cr, vsecp, &acl_ids)) != 0)
1599 if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode))
1600 projid = zfs_inherit_projid(dzp);
1601 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
1602 zfs_acl_ids_free(&acl_ids);
1603 error = SET_ERROR(EDQUOT);
1607 tx = dmu_tx_create(os);
1609 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1610 ZFS_SA_BASE_ATTR_SIZE);
1611 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
1613 fuid_dirtied = zfsvfs->z_fuid_dirty;
1615 zfs_fuid_txhold(zfsvfs, tx);
1616 if (!zfsvfs->z_use_sa &&
1617 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1618 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1619 0, acl_ids.z_aclp->z_acl_bytes);
1621 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
1623 if (error == ERESTART) {
1629 zfs_acl_ids_free(&acl_ids);
1634 zfs_mknode(dzp, vap, tx, cr, IS_TMPFILE, &zp, &acl_ids);
1637 zfs_fuid_sync(zfsvfs, tx);
1639 /* Add to unlinked set */
1641 zfs_unlinked_add(zp, tx);
1642 zfs_acl_ids_free(&acl_ids);
1650 zfs_inode_update(dzp);
1651 zfs_inode_update(zp);
1660 * Remove an entry from a directory.
1662 * IN: dip - inode of directory to remove entry from.
1663 * name - name of entry to remove.
1664 * cr - credentials of caller.
1666 * RETURN: 0 if success
1667 * error code if failure
1671 * ip - ctime (if nlink > 0)
1674 uint64_t null_xattr = 0;
1678 zfs_remove(struct inode *dip, char *name, cred_t *cr, int flags)
1680 znode_t *zp, *dzp = ITOZ(dip);
1683 zfsvfs_t *zfsvfs = ITOZSB(dip);
1685 uint64_t acl_obj, xattr_obj;
1686 uint64_t xattr_obj_unlinked = 0;
1691 boolean_t may_delete_now, delete_now = FALSE;
1692 boolean_t unlinked, toobig = FALSE;
1694 pathname_t *realnmp = NULL;
1698 boolean_t waited = B_FALSE;
1701 return (SET_ERROR(EINVAL));
1705 zilog = zfsvfs->z_log;
1707 if (flags & FIGNORECASE) {
1717 * Attempt to lock directory; fail if entry doesn't exist.
1719 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1729 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
1734 * Need to use rmdir for removing directories.
1736 if (S_ISDIR(ip->i_mode)) {
1737 error = SET_ERROR(EPERM);
1741 mutex_enter(&zp->z_lock);
1742 may_delete_now = atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped);
1743 mutex_exit(&zp->z_lock);
1746 * We may delete the znode now, or we may put it in the unlinked set;
1747 * it depends on whether we're the last link, and on whether there are
1748 * other holds on the inode. So we dmu_tx_hold() the right things to
1749 * allow for either case.
1752 tx = dmu_tx_create(zfsvfs->z_os);
1753 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
1754 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1755 zfs_sa_upgrade_txholds(tx, zp);
1756 zfs_sa_upgrade_txholds(tx, dzp);
1757 if (may_delete_now) {
1758 toobig = zp->z_size > zp->z_blksz * zfs_delete_blocks;
1759 /* if the file is too big, only hold_free a token amount */
1760 dmu_tx_hold_free(tx, zp->z_id, 0,
1761 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
1764 /* are there any extended attributes? */
1765 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1766 &xattr_obj, sizeof (xattr_obj));
1767 if (error == 0 && xattr_obj) {
1768 error = zfs_zget(zfsvfs, xattr_obj, &xzp);
1770 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1771 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
1774 mutex_enter(&zp->z_lock);
1775 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
1776 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
1777 mutex_exit(&zp->z_lock);
1779 /* charge as an update -- would be nice not to charge at all */
1780 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
1783 * Mark this transaction as typically resulting in a net free of space
1785 dmu_tx_mark_netfree(tx);
1787 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
1789 zfs_dirent_unlock(dl);
1790 if (error == ERESTART) {
1810 * Remove the directory entry.
1812 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
1821 * Hold z_lock so that we can make sure that the ACL obj
1822 * hasn't changed. Could have been deleted due to
1825 mutex_enter(&zp->z_lock);
1826 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1827 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
1828 delete_now = may_delete_now && !toobig &&
1829 atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped) &&
1830 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) ==
1835 if (xattr_obj_unlinked) {
1836 ASSERT3U(ZTOI(xzp)->i_nlink, ==, 2);
1837 mutex_enter(&xzp->z_lock);
1838 xzp->z_unlinked = 1;
1839 clear_nlink(ZTOI(xzp));
1841 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
1842 &links, sizeof (links), tx);
1843 ASSERT3U(error, ==, 0);
1844 mutex_exit(&xzp->z_lock);
1845 zfs_unlinked_add(xzp, tx);
1848 error = sa_remove(zp->z_sa_hdl,
1849 SA_ZPL_XATTR(zfsvfs), tx);
1851 error = sa_update(zp->z_sa_hdl,
1852 SA_ZPL_XATTR(zfsvfs), &null_xattr,
1853 sizeof (uint64_t), tx);
1857 * Add to the unlinked set because a new reference could be
1858 * taken concurrently resulting in a deferred destruction.
1860 zfs_unlinked_add(zp, tx);
1861 mutex_exit(&zp->z_lock);
1862 } else if (unlinked) {
1863 mutex_exit(&zp->z_lock);
1864 zfs_unlinked_add(zp, tx);
1868 if (flags & FIGNORECASE)
1870 zfs_log_remove(zilog, tx, txtype, dzp, name, obj);
1877 zfs_dirent_unlock(dl);
1878 zfs_inode_update(dzp);
1879 zfs_inode_update(zp);
1887 zfs_inode_update(xzp);
1888 zfs_iput_async(ZTOI(xzp));
1891 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1892 zil_commit(zilog, 0);
1899 * Create a new directory and insert it into dip using the name
1900 * provided. Return a pointer to the inserted directory.
1902 * IN: dip - inode of directory to add subdir to.
1903 * dirname - name of new directory.
1904 * vap - attributes of new directory.
1905 * cr - credentials of caller.
1906 * vsecp - ACL to be set
1908 * OUT: ipp - inode of created directory.
1910 * RETURN: 0 if success
1911 * error code if failure
1914 * dip - ctime|mtime updated
1915 * ipp - ctime|mtime|atime updated
1919 zfs_mkdir(struct inode *dip, char *dirname, vattr_t *vap, struct inode **ipp,
1920 cred_t *cr, int flags, vsecattr_t *vsecp)
1922 znode_t *zp, *dzp = ITOZ(dip);
1923 zfsvfs_t *zfsvfs = ITOZSB(dip);
1931 gid_t gid = crgetgid(cr);
1932 zfs_acl_ids_t acl_ids;
1933 boolean_t fuid_dirtied;
1934 boolean_t waited = B_FALSE;
1936 ASSERT(S_ISDIR(vap->va_mode));
1939 * If we have an ephemeral id, ACL, or XVATTR then
1940 * make sure file system is at proper version
1944 if (zfsvfs->z_use_fuids == B_FALSE &&
1945 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1946 return (SET_ERROR(EINVAL));
1948 if (dirname == NULL)
1949 return (SET_ERROR(EINVAL));
1953 zilog = zfsvfs->z_log;
1955 if (dzp->z_pflags & ZFS_XATTR) {
1957 return (SET_ERROR(EINVAL));
1960 if (zfsvfs->z_utf8 && u8_validate(dirname,
1961 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1963 return (SET_ERROR(EILSEQ));
1965 if (flags & FIGNORECASE)
1968 if (vap->va_mask & ATTR_XVATTR) {
1969 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1970 crgetuid(cr), cr, vap->va_mode)) != 0) {
1976 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
1977 vsecp, &acl_ids)) != 0) {
1982 * First make sure the new directory doesn't exist.
1984 * Existence is checked first to make sure we don't return
1985 * EACCES instead of EEXIST which can cause some applications
1991 if ((error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
1993 zfs_acl_ids_free(&acl_ids);
1998 if ((error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr))) {
1999 zfs_acl_ids_free(&acl_ids);
2000 zfs_dirent_unlock(dl);
2005 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zfs_inherit_projid(dzp))) {
2006 zfs_acl_ids_free(&acl_ids);
2007 zfs_dirent_unlock(dl);
2009 return (SET_ERROR(EDQUOT));
2013 * Add a new entry to the directory.
2015 tx = dmu_tx_create(zfsvfs->z_os);
2016 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
2017 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
2018 fuid_dirtied = zfsvfs->z_fuid_dirty;
2020 zfs_fuid_txhold(zfsvfs, tx);
2021 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
2022 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
2023 acl_ids.z_aclp->z_acl_bytes);
2026 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
2027 ZFS_SA_BASE_ATTR_SIZE);
2029 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
2031 zfs_dirent_unlock(dl);
2032 if (error == ERESTART) {
2038 zfs_acl_ids_free(&acl_ids);
2047 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
2050 * Now put new name in parent dir.
2052 error = zfs_link_create(dl, zp, tx, ZNEW);
2054 zfs_znode_delete(zp, tx);
2055 remove_inode_hash(ZTOI(zp));
2060 zfs_fuid_sync(zfsvfs, tx);
2064 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
2065 if (flags & FIGNORECASE)
2067 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
2068 acl_ids.z_fuidp, vap);
2071 zfs_acl_ids_free(&acl_ids);
2075 zfs_dirent_unlock(dl);
2077 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
2078 zil_commit(zilog, 0);
2083 zfs_inode_update(dzp);
2084 zfs_inode_update(zp);
2091 * Remove a directory subdir entry. If the current working
2092 * directory is the same as the subdir to be removed, the
2095 * IN: dip - inode of directory to remove from.
2096 * name - name of directory to be removed.
2097 * cwd - inode of current working directory.
2098 * cr - credentials of caller.
2099 * flags - case flags
2101 * RETURN: 0 on success, error code on failure.
2104 * dip - ctime|mtime updated
2108 zfs_rmdir(struct inode *dip, char *name, struct inode *cwd, cred_t *cr,
2111 znode_t *dzp = ITOZ(dip);
2114 zfsvfs_t *zfsvfs = ITOZSB(dip);
2120 boolean_t waited = B_FALSE;
2123 return (SET_ERROR(EINVAL));
2127 zilog = zfsvfs->z_log;
2129 if (flags & FIGNORECASE)
2135 * Attempt to lock directory; fail if entry doesn't exist.
2137 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
2145 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
2149 if (!S_ISDIR(ip->i_mode)) {
2150 error = SET_ERROR(ENOTDIR);
2155 error = SET_ERROR(EINVAL);
2160 * Grab a lock on the directory to make sure that no one is
2161 * trying to add (or lookup) entries while we are removing it.
2163 rw_enter(&zp->z_name_lock, RW_WRITER);
2166 * Grab a lock on the parent pointer to make sure we play well
2167 * with the treewalk and directory rename code.
2169 rw_enter(&zp->z_parent_lock, RW_WRITER);
2171 tx = dmu_tx_create(zfsvfs->z_os);
2172 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
2173 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2174 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
2175 zfs_sa_upgrade_txholds(tx, zp);
2176 zfs_sa_upgrade_txholds(tx, dzp);
2177 dmu_tx_mark_netfree(tx);
2178 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
2180 rw_exit(&zp->z_parent_lock);
2181 rw_exit(&zp->z_name_lock);
2182 zfs_dirent_unlock(dl);
2183 if (error == ERESTART) {
2196 error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
2199 uint64_t txtype = TX_RMDIR;
2200 if (flags & FIGNORECASE)
2202 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT);
2207 rw_exit(&zp->z_parent_lock);
2208 rw_exit(&zp->z_name_lock);
2210 zfs_dirent_unlock(dl);
2212 zfs_inode_update(dzp);
2213 zfs_inode_update(zp);
2216 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
2217 zil_commit(zilog, 0);
2224 * Read as many directory entries as will fit into the provided
2225 * dirent buffer from the given directory cursor position.
2227 * IN: ip - inode of directory to read.
2228 * dirent - buffer for directory entries.
2230 * OUT: dirent - filler buffer of directory entries.
2232 * RETURN: 0 if success
2233 * error code if failure
2236 * ip - atime updated
2238 * Note that the low 4 bits of the cookie returned by zap is always zero.
2239 * This allows us to use the low range for "special" directory entries:
2240 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2241 * we use the offset 2 for the '.zfs' directory.
2245 zfs_readdir(struct inode *ip, zpl_dir_context_t *ctx, cred_t *cr)
2247 znode_t *zp = ITOZ(ip);
2248 zfsvfs_t *zfsvfs = ITOZSB(ip);
2251 zap_attribute_t zap;
2257 uint64_t offset; /* must be unsigned; checks for < 1 */
2262 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
2263 &parent, sizeof (parent))) != 0)
2267 * Quit if directory has been removed (posix)
2275 prefetch = zp->z_zn_prefetch;
2278 * Initialize the iterator cursor.
2282 * Start iteration from the beginning of the directory.
2284 zap_cursor_init(&zc, os, zp->z_id);
2287 * The offset is a serialized cursor.
2289 zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
2293 * Transform to file-system independent format
2298 * Special case `.', `..', and `.zfs'.
2301 (void) strcpy(zap.za_name, ".");
2302 zap.za_normalization_conflict = 0;
2305 } else if (offset == 1) {
2306 (void) strcpy(zap.za_name, "..");
2307 zap.za_normalization_conflict = 0;
2310 } else if (offset == 2 && zfs_show_ctldir(zp)) {
2311 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
2312 zap.za_normalization_conflict = 0;
2313 objnum = ZFSCTL_INO_ROOT;
2319 if ((error = zap_cursor_retrieve(&zc, &zap))) {
2320 if (error == ENOENT)
2327 * Allow multiple entries provided the first entry is
2328 * the object id. Non-zpl consumers may safely make
2329 * use of the additional space.
2331 * XXX: This should be a feature flag for compatibility
2333 if (zap.za_integer_length != 8 ||
2334 zap.za_num_integers == 0) {
2335 cmn_err(CE_WARN, "zap_readdir: bad directory "
2336 "entry, obj = %lld, offset = %lld, "
2337 "length = %d, num = %lld\n",
2338 (u_longlong_t)zp->z_id,
2339 (u_longlong_t)offset,
2340 zap.za_integer_length,
2341 (u_longlong_t)zap.za_num_integers);
2342 error = SET_ERROR(ENXIO);
2346 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
2347 type = ZFS_DIRENT_TYPE(zap.za_first_integer);
2350 done = !zpl_dir_emit(ctx, zap.za_name, strlen(zap.za_name),
2355 /* Prefetch znode */
2357 dmu_prefetch(os, objnum, 0, 0, 0,
2358 ZIO_PRIORITY_SYNC_READ);
2362 * Move to the next entry, fill in the previous offset.
2364 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) {
2365 zap_cursor_advance(&zc);
2366 offset = zap_cursor_serialize(&zc);
2372 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
2375 zap_cursor_fini(&zc);
2376 if (error == ENOENT)
2384 ulong_t zfs_fsync_sync_cnt = 4;
2387 zfs_fsync(struct inode *ip, int syncflag, cred_t *cr)
2389 znode_t *zp = ITOZ(ip);
2390 zfsvfs_t *zfsvfs = ITOZSB(ip);
2392 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt);
2394 if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
2397 zil_commit(zfsvfs->z_log, zp->z_id);
2400 tsd_set(zfs_fsyncer_key, NULL);
2407 * Get the requested file attributes and place them in the provided
2410 * IN: ip - inode of file.
2411 * vap - va_mask identifies requested attributes.
2412 * If ATTR_XVATTR set, then optional attrs are requested
2413 * flags - ATTR_NOACLCHECK (CIFS server context)
2414 * cr - credentials of caller.
2416 * OUT: vap - attribute values.
2418 * RETURN: 0 (always succeeds)
2422 zfs_getattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2424 znode_t *zp = ITOZ(ip);
2425 zfsvfs_t *zfsvfs = ITOZSB(ip);
2428 uint64_t atime[2], mtime[2], ctime[2];
2429 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2430 xoptattr_t *xoap = NULL;
2431 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2432 sa_bulk_attr_t bulk[3];
2438 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);
2440 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
2441 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
2442 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
2444 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
2450 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2451 * Also, if we are the owner don't bother, since owner should
2452 * always be allowed to read basic attributes of file.
2454 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
2455 (vap->va_uid != crgetuid(cr))) {
2456 if ((error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
2464 * Return all attributes. It's cheaper to provide the answer
2465 * than to determine whether we were asked the question.
2468 mutex_enter(&zp->z_lock);
2469 vap->va_type = vn_mode_to_vtype(zp->z_mode);
2470 vap->va_mode = zp->z_mode;
2471 vap->va_fsid = ZTOI(zp)->i_sb->s_dev;
2472 vap->va_nodeid = zp->z_id;
2473 if ((zp->z_id == zfsvfs->z_root) && zfs_show_ctldir(zp))
2474 links = ZTOI(zp)->i_nlink + 1;
2476 links = ZTOI(zp)->i_nlink;
2477 vap->va_nlink = MIN(links, ZFS_LINK_MAX);
2478 vap->va_size = i_size_read(ip);
2479 vap->va_rdev = ip->i_rdev;
2480 vap->va_seq = ip->i_generation;
2483 * Add in any requested optional attributes and the create time.
2484 * Also set the corresponding bits in the returned attribute bitmap.
2486 if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) {
2487 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
2489 ((zp->z_pflags & ZFS_ARCHIVE) != 0);
2490 XVA_SET_RTN(xvap, XAT_ARCHIVE);
2493 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
2494 xoap->xoa_readonly =
2495 ((zp->z_pflags & ZFS_READONLY) != 0);
2496 XVA_SET_RTN(xvap, XAT_READONLY);
2499 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
2501 ((zp->z_pflags & ZFS_SYSTEM) != 0);
2502 XVA_SET_RTN(xvap, XAT_SYSTEM);
2505 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
2507 ((zp->z_pflags & ZFS_HIDDEN) != 0);
2508 XVA_SET_RTN(xvap, XAT_HIDDEN);
2511 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2512 xoap->xoa_nounlink =
2513 ((zp->z_pflags & ZFS_NOUNLINK) != 0);
2514 XVA_SET_RTN(xvap, XAT_NOUNLINK);
2517 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2518 xoap->xoa_immutable =
2519 ((zp->z_pflags & ZFS_IMMUTABLE) != 0);
2520 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
2523 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2524 xoap->xoa_appendonly =
2525 ((zp->z_pflags & ZFS_APPENDONLY) != 0);
2526 XVA_SET_RTN(xvap, XAT_APPENDONLY);
2529 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2531 ((zp->z_pflags & ZFS_NODUMP) != 0);
2532 XVA_SET_RTN(xvap, XAT_NODUMP);
2535 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
2537 ((zp->z_pflags & ZFS_OPAQUE) != 0);
2538 XVA_SET_RTN(xvap, XAT_OPAQUE);
2541 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2542 xoap->xoa_av_quarantined =
2543 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
2544 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
2547 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2548 xoap->xoa_av_modified =
2549 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
2550 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
2553 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
2554 S_ISREG(ip->i_mode)) {
2555 zfs_sa_get_scanstamp(zp, xvap);
2558 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
2561 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
2562 times, sizeof (times));
2563 ZFS_TIME_DECODE(&xoap->xoa_createtime, times);
2564 XVA_SET_RTN(xvap, XAT_CREATETIME);
2567 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2568 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
2569 XVA_SET_RTN(xvap, XAT_REPARSE);
2571 if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
2572 xoap->xoa_generation = ip->i_generation;
2573 XVA_SET_RTN(xvap, XAT_GEN);
2576 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
2578 ((zp->z_pflags & ZFS_OFFLINE) != 0);
2579 XVA_SET_RTN(xvap, XAT_OFFLINE);
2582 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
2584 ((zp->z_pflags & ZFS_SPARSE) != 0);
2585 XVA_SET_RTN(xvap, XAT_SPARSE);
2588 if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
2589 xoap->xoa_projinherit =
2590 ((zp->z_pflags & ZFS_PROJINHERIT) != 0);
2591 XVA_SET_RTN(xvap, XAT_PROJINHERIT);
2594 if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
2595 xoap->xoa_projid = zp->z_projid;
2596 XVA_SET_RTN(xvap, XAT_PROJID);
2600 ZFS_TIME_DECODE(&vap->va_atime, atime);
2601 ZFS_TIME_DECODE(&vap->va_mtime, mtime);
2602 ZFS_TIME_DECODE(&vap->va_ctime, ctime);
2604 mutex_exit(&zp->z_lock);
2606 sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks);
2608 if (zp->z_blksz == 0) {
2610 * Block size hasn't been set; suggest maximal I/O transfers.
2612 vap->va_blksize = zfsvfs->z_max_blksz;
2620 * Get the basic file attributes and place them in the provided kstat
2621 * structure. The inode is assumed to be the authoritative source
2622 * for most of the attributes. However, the znode currently has the
2623 * authoritative atime, blksize, and block count.
2625 * IN: ip - inode of file.
2627 * OUT: sp - kstat values.
2629 * RETURN: 0 (always succeeds)
2633 zfs_getattr_fast(struct inode *ip, struct kstat *sp)
2635 znode_t *zp = ITOZ(ip);
2636 zfsvfs_t *zfsvfs = ITOZSB(ip);
2638 u_longlong_t nblocks;
2643 mutex_enter(&zp->z_lock);
2645 generic_fillattr(ip, sp);
2647 sa_object_size(zp->z_sa_hdl, &blksize, &nblocks);
2648 sp->blksize = blksize;
2649 sp->blocks = nblocks;
2651 if (unlikely(zp->z_blksz == 0)) {
2653 * Block size hasn't been set; suggest maximal I/O transfers.
2655 sp->blksize = zfsvfs->z_max_blksz;
2658 mutex_exit(&zp->z_lock);
2661 * Required to prevent NFS client from detecting different inode
2662 * numbers of snapshot root dentry before and after snapshot mount.
2664 if (zfsvfs->z_issnap) {
2665 if (ip->i_sb->s_root->d_inode == ip)
2666 sp->ino = ZFSCTL_INO_SNAPDIRS -
2667 dmu_objset_id(zfsvfs->z_os);
2676 * For the operation of changing file's user/group/project, we need to
2677 * handle not only the main object that is assigned to the file directly,
2678 * but also the ones that are used by the file via hidden xattr directory.
2680 * Because the xattr directory may contains many EA entries, as to it may
2681 * be impossible to change all of them via the transaction of changing the
2682 * main object's user/group/project attributes. Then we have to change them
2683 * via other multiple independent transactions one by one. It may be not good
2684 * solution, but we have no better idea yet.
2687 zfs_setattr_dir(znode_t *dzp)
2689 struct inode *dxip = ZTOI(dzp);
2690 struct inode *xip = NULL;
2691 zfsvfs_t *zfsvfs = ITOZSB(dxip);
2692 objset_t *os = zfsvfs->z_os;
2694 zap_attribute_t zap;
2697 dmu_tx_t *tx = NULL;
2699 sa_bulk_attr_t bulk[4];
2703 zap_cursor_init(&zc, os, dzp->z_id);
2704 while ((err = zap_cursor_retrieve(&zc, &zap)) == 0) {
2705 if (zap.za_integer_length != 8 || zap.za_num_integers != 1) {
2710 err = zfs_dirent_lock(&dl, dzp, (char *)zap.za_name, &zp,
2711 ZEXISTS, NULL, NULL);
2718 if (KUID_TO_SUID(xip->i_uid) == KUID_TO_SUID(dxip->i_uid) &&
2719 KGID_TO_SGID(xip->i_gid) == KGID_TO_SGID(dxip->i_gid) &&
2720 zp->z_projid == dzp->z_projid)
2723 tx = dmu_tx_create(os);
2724 if (!(zp->z_pflags & ZFS_PROJID))
2725 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2727 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2729 err = dmu_tx_assign(tx, TXG_WAIT);
2733 mutex_enter(&dzp->z_lock);
2735 if (KUID_TO_SUID(xip->i_uid) != KUID_TO_SUID(dxip->i_uid)) {
2736 xip->i_uid = dxip->i_uid;
2737 uid = zfs_uid_read(dxip);
2738 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
2739 &uid, sizeof (uid));
2742 if (KGID_TO_SGID(xip->i_gid) != KGID_TO_SGID(dxip->i_gid)) {
2743 xip->i_gid = dxip->i_gid;
2744 gid = zfs_gid_read(dxip);
2745 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
2746 &gid, sizeof (gid));
2749 if (zp->z_projid != dzp->z_projid) {
2750 if (!(zp->z_pflags & ZFS_PROJID)) {
2751 zp->z_pflags |= ZFS_PROJID;
2752 SA_ADD_BULK_ATTR(bulk, count,
2753 SA_ZPL_FLAGS(zfsvfs), NULL, &zp->z_pflags,
2754 sizeof (zp->z_pflags));
2757 zp->z_projid = dzp->z_projid;
2758 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PROJID(zfsvfs),
2759 NULL, &zp->z_projid, sizeof (zp->z_projid));
2762 mutex_exit(&dzp->z_lock);
2764 if (likely(count > 0)) {
2765 err = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
2771 if (err != 0 && err != ENOENT)
2778 zfs_dirent_unlock(dl);
2780 zap_cursor_advance(&zc);
2787 zfs_dirent_unlock(dl);
2789 zap_cursor_fini(&zc);
2791 return (err == ENOENT ? 0 : err);
2795 * Set the file attributes to the values contained in the
2798 * IN: ip - inode of file to be modified.
2799 * vap - new attribute values.
2800 * If ATTR_XVATTR set, then optional attrs are being set
2801 * flags - ATTR_UTIME set if non-default time values provided.
2802 * - ATTR_NOACLCHECK (CIFS context only).
2803 * cr - credentials of caller.
2805 * RETURN: 0 if success
2806 * error code if failure
2809 * ip - ctime updated, mtime updated if size changed.
2813 zfs_setattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2815 znode_t *zp = ITOZ(ip);
2816 zfsvfs_t *zfsvfs = ITOZSB(ip);
2817 objset_t *os = zfsvfs->z_os;
2821 xvattr_t *tmpxvattr;
2822 uint_t mask = vap->va_mask;
2823 uint_t saved_mask = 0;
2826 uint64_t new_kuid = 0, new_kgid = 0, new_uid, new_gid;
2828 uint64_t mtime[2], ctime[2], atime[2];
2829 uint64_t projid = ZFS_INVALID_PROJID;
2831 int need_policy = FALSE;
2833 zfs_fuid_info_t *fuidp = NULL;
2834 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2837 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2838 boolean_t fuid_dirtied = B_FALSE;
2839 boolean_t handle_eadir = B_FALSE;
2840 sa_bulk_attr_t *bulk, *xattr_bulk;
2841 int count = 0, xattr_count = 0, bulks = 8;
2850 * If this is a xvattr_t, then get a pointer to the structure of
2851 * optional attributes. If this is NULL, then we have a vattr_t.
2853 xoap = xva_getxoptattr(xvap);
2854 if (xoap != NULL && (mask & ATTR_XVATTR)) {
2855 if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
2856 if (!dmu_objset_projectquota_enabled(os) ||
2857 (!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode))) {
2859 return (SET_ERROR(ENOTSUP));
2862 projid = xoap->xoa_projid;
2863 if (unlikely(projid == ZFS_INVALID_PROJID)) {
2865 return (SET_ERROR(EINVAL));
2868 if (projid == zp->z_projid && zp->z_pflags & ZFS_PROJID)
2869 projid = ZFS_INVALID_PROJID;
2874 if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT) &&
2875 (xoap->xoa_projinherit !=
2876 ((zp->z_pflags & ZFS_PROJINHERIT) != 0)) &&
2877 (!dmu_objset_projectquota_enabled(os) ||
2878 (!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode)))) {
2880 return (SET_ERROR(ENOTSUP));
2884 zilog = zfsvfs->z_log;
2887 * Make sure that if we have ephemeral uid/gid or xvattr specified
2888 * that file system is at proper version level
2891 if (zfsvfs->z_use_fuids == B_FALSE &&
2892 (((mask & ATTR_UID) && IS_EPHEMERAL(vap->va_uid)) ||
2893 ((mask & ATTR_GID) && IS_EPHEMERAL(vap->va_gid)) ||
2894 (mask & ATTR_XVATTR))) {
2896 return (SET_ERROR(EINVAL));
2899 if (mask & ATTR_SIZE && S_ISDIR(ip->i_mode)) {
2901 return (SET_ERROR(EISDIR));
2904 if (mask & ATTR_SIZE && !S_ISREG(ip->i_mode) && !S_ISFIFO(ip->i_mode)) {
2906 return (SET_ERROR(EINVAL));
2909 tmpxvattr = kmem_alloc(sizeof (xvattr_t), KM_SLEEP);
2910 xva_init(tmpxvattr);
2912 bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);
2913 xattr_bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);
2916 * Immutable files can only alter immutable bit and atime
2918 if ((zp->z_pflags & ZFS_IMMUTABLE) &&
2919 ((mask & (ATTR_SIZE|ATTR_UID|ATTR_GID|ATTR_MTIME|ATTR_MODE)) ||
2920 ((mask & ATTR_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
2921 err = SET_ERROR(EPERM);
2925 if ((mask & ATTR_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
2926 err = SET_ERROR(EPERM);
2931 * Verify timestamps doesn't overflow 32 bits.
2932 * ZFS can handle large timestamps, but 32bit syscalls can't
2933 * handle times greater than 2039. This check should be removed
2934 * once large timestamps are fully supported.
2936 if (mask & (ATTR_ATIME | ATTR_MTIME)) {
2937 if (((mask & ATTR_ATIME) &&
2938 TIMESPEC_OVERFLOW(&vap->va_atime)) ||
2939 ((mask & ATTR_MTIME) &&
2940 TIMESPEC_OVERFLOW(&vap->va_mtime))) {
2941 err = SET_ERROR(EOVERFLOW);
2950 /* Can this be moved to before the top label? */
2951 if (zfs_is_readonly(zfsvfs)) {
2952 err = SET_ERROR(EROFS);
2957 * First validate permissions
2960 if (mask & ATTR_SIZE) {
2961 err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
2966 * XXX - Note, we are not providing any open
2967 * mode flags here (like FNDELAY), so we may
2968 * block if there are locks present... this
2969 * should be addressed in openat().
2971 /* XXX - would it be OK to generate a log record here? */
2972 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
2977 if (mask & (ATTR_ATIME|ATTR_MTIME) ||
2978 ((mask & ATTR_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) ||
2979 XVA_ISSET_REQ(xvap, XAT_READONLY) ||
2980 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) ||
2981 XVA_ISSET_REQ(xvap, XAT_OFFLINE) ||
2982 XVA_ISSET_REQ(xvap, XAT_SPARSE) ||
2983 XVA_ISSET_REQ(xvap, XAT_CREATETIME) ||
2984 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
2985 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
2989 if (mask & (ATTR_UID|ATTR_GID)) {
2990 int idmask = (mask & (ATTR_UID|ATTR_GID));
2995 * NOTE: even if a new mode is being set,
2996 * we may clear S_ISUID/S_ISGID bits.
2999 if (!(mask & ATTR_MODE))
3000 vap->va_mode = zp->z_mode;
3003 * Take ownership or chgrp to group we are a member of
3006 take_owner = (mask & ATTR_UID) && (vap->va_uid == crgetuid(cr));
3007 take_group = (mask & ATTR_GID) &&
3008 zfs_groupmember(zfsvfs, vap->va_gid, cr);
3011 * If both ATTR_UID and ATTR_GID are set then take_owner and
3012 * take_group must both be set in order to allow taking
3015 * Otherwise, send the check through secpolicy_vnode_setattr()
3019 if (((idmask == (ATTR_UID|ATTR_GID)) &&
3020 take_owner && take_group) ||
3021 ((idmask == ATTR_UID) && take_owner) ||
3022 ((idmask == ATTR_GID) && take_group)) {
3023 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
3024 skipaclchk, cr) == 0) {
3026 * Remove setuid/setgid for non-privileged users
3028 (void) secpolicy_setid_clear(vap, cr);
3029 trim_mask = (mask & (ATTR_UID|ATTR_GID));
3038 mutex_enter(&zp->z_lock);
3039 oldva.va_mode = zp->z_mode;
3040 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
3041 if (mask & ATTR_XVATTR) {
3043 * Update xvattr mask to include only those attributes
3044 * that are actually changing.
3046 * the bits will be restored prior to actually setting
3047 * the attributes so the caller thinks they were set.
3049 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
3050 if (xoap->xoa_appendonly !=
3051 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
3054 XVA_CLR_REQ(xvap, XAT_APPENDONLY);
3055 XVA_SET_REQ(tmpxvattr, XAT_APPENDONLY);
3059 if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
3060 if (xoap->xoa_projinherit !=
3061 ((zp->z_pflags & ZFS_PROJINHERIT) != 0)) {
3064 XVA_CLR_REQ(xvap, XAT_PROJINHERIT);
3065 XVA_SET_REQ(tmpxvattr, XAT_PROJINHERIT);
3069 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
3070 if (xoap->xoa_nounlink !=
3071 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
3074 XVA_CLR_REQ(xvap, XAT_NOUNLINK);
3075 XVA_SET_REQ(tmpxvattr, XAT_NOUNLINK);
3079 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
3080 if (xoap->xoa_immutable !=
3081 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
3084 XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
3085 XVA_SET_REQ(tmpxvattr, XAT_IMMUTABLE);
3089 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
3090 if (xoap->xoa_nodump !=
3091 ((zp->z_pflags & ZFS_NODUMP) != 0)) {
3094 XVA_CLR_REQ(xvap, XAT_NODUMP);
3095 XVA_SET_REQ(tmpxvattr, XAT_NODUMP);
3099 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
3100 if (xoap->xoa_av_modified !=
3101 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
3104 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
3105 XVA_SET_REQ(tmpxvattr, XAT_AV_MODIFIED);
3109 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
3110 if ((!S_ISREG(ip->i_mode) &&
3111 xoap->xoa_av_quarantined) ||
3112 xoap->xoa_av_quarantined !=
3113 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
3116 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
3117 XVA_SET_REQ(tmpxvattr, XAT_AV_QUARANTINED);
3121 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
3122 mutex_exit(&zp->z_lock);
3123 err = SET_ERROR(EPERM);
3127 if (need_policy == FALSE &&
3128 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) ||
3129 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
3134 mutex_exit(&zp->z_lock);
3136 if (mask & ATTR_MODE) {
3137 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
3138 err = secpolicy_setid_setsticky_clear(ip, vap,
3143 trim_mask |= ATTR_MODE;
3151 * If trim_mask is set then take ownership
3152 * has been granted or write_acl is present and user
3153 * has the ability to modify mode. In that case remove
3154 * UID|GID and or MODE from mask so that
3155 * secpolicy_vnode_setattr() doesn't revoke it.
3159 saved_mask = vap->va_mask;
3160 vap->va_mask &= ~trim_mask;
3162 err = secpolicy_vnode_setattr(cr, ip, vap, &oldva, flags,
3163 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
3168 vap->va_mask |= saved_mask;
3172 * secpolicy_vnode_setattr, or take ownership may have
3175 mask = vap->va_mask;
3177 if ((mask & (ATTR_UID | ATTR_GID)) || projid != ZFS_INVALID_PROJID) {
3178 handle_eadir = B_TRUE;
3179 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
3180 &xattr_obj, sizeof (xattr_obj));
3182 if (err == 0 && xattr_obj) {
3183 err = zfs_zget(ZTOZSB(zp), xattr_obj, &attrzp);
3187 if (mask & ATTR_UID) {
3188 new_kuid = zfs_fuid_create(zfsvfs,
3189 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
3190 if (new_kuid != KUID_TO_SUID(ZTOI(zp)->i_uid) &&
3191 zfs_id_overquota(zfsvfs, DMU_USERUSED_OBJECT,
3195 err = SET_ERROR(EDQUOT);
3200 if (mask & ATTR_GID) {
3201 new_kgid = zfs_fuid_create(zfsvfs,
3202 (uint64_t)vap->va_gid, cr, ZFS_GROUP, &fuidp);
3203 if (new_kgid != KGID_TO_SGID(ZTOI(zp)->i_gid) &&
3204 zfs_id_overquota(zfsvfs, DMU_GROUPUSED_OBJECT,
3208 err = SET_ERROR(EDQUOT);
3213 if (projid != ZFS_INVALID_PROJID &&
3214 zfs_id_overquota(zfsvfs, DMU_PROJECTUSED_OBJECT, projid)) {
3221 tx = dmu_tx_create(os);
3223 if (mask & ATTR_MODE) {
3224 uint64_t pmode = zp->z_mode;
3226 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
3228 zfs_acl_chmod_setattr(zp, &aclp, new_mode);
3230 mutex_enter(&zp->z_lock);
3231 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
3233 * Are we upgrading ACL from old V0 format
3236 if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
3237 zfs_znode_acl_version(zp) ==
3238 ZFS_ACL_VERSION_INITIAL) {
3239 dmu_tx_hold_free(tx, acl_obj, 0,
3241 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3242 0, aclp->z_acl_bytes);
3244 dmu_tx_hold_write(tx, acl_obj, 0,
3247 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3248 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3249 0, aclp->z_acl_bytes);
3251 mutex_exit(&zp->z_lock);
3252 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3254 if (((mask & ATTR_XVATTR) &&
3255 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) ||
3256 (projid != ZFS_INVALID_PROJID &&
3257 !(zp->z_pflags & ZFS_PROJID)))
3258 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3260 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
3264 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
3267 fuid_dirtied = zfsvfs->z_fuid_dirty;
3269 zfs_fuid_txhold(zfsvfs, tx);
3271 zfs_sa_upgrade_txholds(tx, zp);
3273 err = dmu_tx_assign(tx, TXG_WAIT);
3279 * Set each attribute requested.
3280 * We group settings according to the locks they need to acquire.
3282 * Note: you cannot set ctime directly, although it will be
3283 * updated as a side-effect of calling this function.
3286 if (projid != ZFS_INVALID_PROJID && !(zp->z_pflags & ZFS_PROJID)) {
3288 * For the existed object that is upgraded from old system,
3289 * its on-disk layout has no slot for the project ID attribute.
3290 * But quota accounting logic needs to access related slots by
3291 * offset directly. So we need to adjust old objects' layout
3292 * to make the project ID to some unified and fixed offset.
3295 err = sa_add_projid(attrzp->z_sa_hdl, tx, projid);
3297 err = sa_add_projid(zp->z_sa_hdl, tx, projid);
3299 if (unlikely(err == EEXIST))
3304 projid = ZFS_INVALID_PROJID;
3307 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3308 mutex_enter(&zp->z_acl_lock);
3309 mutex_enter(&zp->z_lock);
3311 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
3312 &zp->z_pflags, sizeof (zp->z_pflags));
3315 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3316 mutex_enter(&attrzp->z_acl_lock);
3317 mutex_enter(&attrzp->z_lock);
3318 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3319 SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags,
3320 sizeof (attrzp->z_pflags));
3321 if (projid != ZFS_INVALID_PROJID) {
3322 attrzp->z_projid = projid;
3323 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3324 SA_ZPL_PROJID(zfsvfs), NULL, &attrzp->z_projid,
3325 sizeof (attrzp->z_projid));
3329 if (mask & (ATTR_UID|ATTR_GID)) {
3331 if (mask & ATTR_UID) {
3332 ZTOI(zp)->i_uid = SUID_TO_KUID(new_kuid);
3333 new_uid = zfs_uid_read(ZTOI(zp));
3334 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
3335 &new_uid, sizeof (new_uid));
3337 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3338 SA_ZPL_UID(zfsvfs), NULL, &new_uid,
3340 ZTOI(attrzp)->i_uid = SUID_TO_KUID(new_uid);
3344 if (mask & ATTR_GID) {
3345 ZTOI(zp)->i_gid = SGID_TO_KGID(new_kgid);
3346 new_gid = zfs_gid_read(ZTOI(zp));
3347 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
3348 NULL, &new_gid, sizeof (new_gid));
3350 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3351 SA_ZPL_GID(zfsvfs), NULL, &new_gid,
3353 ZTOI(attrzp)->i_gid = SGID_TO_KGID(new_kgid);
3356 if (!(mask & ATTR_MODE)) {
3357 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs),
3358 NULL, &new_mode, sizeof (new_mode));
3359 new_mode = zp->z_mode;
3361 err = zfs_acl_chown_setattr(zp);
3364 err = zfs_acl_chown_setattr(attrzp);
3369 if (mask & ATTR_MODE) {
3370 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
3371 &new_mode, sizeof (new_mode));
3372 zp->z_mode = ZTOI(zp)->i_mode = new_mode;
3373 ASSERT3P(aclp, !=, NULL);
3374 err = zfs_aclset_common(zp, aclp, cr, tx);
3376 if (zp->z_acl_cached)
3377 zfs_acl_free(zp->z_acl_cached);
3378 zp->z_acl_cached = aclp;
3382 if ((mask & ATTR_ATIME) || zp->z_atime_dirty) {
3383 zp->z_atime_dirty = 0;
3384 ZFS_TIME_ENCODE(&ip->i_atime, atime);
3385 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
3386 &atime, sizeof (atime));
3389 if (mask & (ATTR_MTIME | ATTR_SIZE)) {
3390 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
3391 ZTOI(zp)->i_mtime = zpl_inode_timespec_trunc(vap->va_mtime,
3392 ZTOI(zp)->i_sb->s_time_gran);
3394 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
3395 mtime, sizeof (mtime));
3398 if (mask & (ATTR_CTIME | ATTR_SIZE)) {
3399 ZFS_TIME_ENCODE(&vap->va_ctime, ctime);
3400 ZTOI(zp)->i_ctime = zpl_inode_timespec_trunc(vap->va_ctime,
3401 ZTOI(zp)->i_sb->s_time_gran);
3402 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
3403 ctime, sizeof (ctime));
3406 if (projid != ZFS_INVALID_PROJID) {
3407 zp->z_projid = projid;
3408 SA_ADD_BULK_ATTR(bulk, count,
3409 SA_ZPL_PROJID(zfsvfs), NULL, &zp->z_projid,
3410 sizeof (zp->z_projid));
3413 if (attrzp && mask) {
3414 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3415 SA_ZPL_CTIME(zfsvfs), NULL, &ctime,
3420 * Do this after setting timestamps to prevent timestamp
3421 * update from toggling bit
3424 if (xoap && (mask & ATTR_XVATTR)) {
3427 * restore trimmed off masks
3428 * so that return masks can be set for caller.
3431 if (XVA_ISSET_REQ(tmpxvattr, XAT_APPENDONLY)) {
3432 XVA_SET_REQ(xvap, XAT_APPENDONLY);
3434 if (XVA_ISSET_REQ(tmpxvattr, XAT_NOUNLINK)) {
3435 XVA_SET_REQ(xvap, XAT_NOUNLINK);
3437 if (XVA_ISSET_REQ(tmpxvattr, XAT_IMMUTABLE)) {
3438 XVA_SET_REQ(xvap, XAT_IMMUTABLE);
3440 if (XVA_ISSET_REQ(tmpxvattr, XAT_NODUMP)) {
3441 XVA_SET_REQ(xvap, XAT_NODUMP);
3443 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_MODIFIED)) {
3444 XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
3446 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_QUARANTINED)) {
3447 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
3449 if (XVA_ISSET_REQ(tmpxvattr, XAT_PROJINHERIT)) {
3450 XVA_SET_REQ(xvap, XAT_PROJINHERIT);
3453 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3454 ASSERT(S_ISREG(ip->i_mode));
3456 zfs_xvattr_set(zp, xvap, tx);
3460 zfs_fuid_sync(zfsvfs, tx);
3463 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);
3465 mutex_exit(&zp->z_lock);
3466 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3467 mutex_exit(&zp->z_acl_lock);
3470 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3471 mutex_exit(&attrzp->z_acl_lock);
3472 mutex_exit(&attrzp->z_lock);
3475 if (err == 0 && xattr_count > 0) {
3476 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
3485 zfs_fuid_info_free(fuidp);
3493 if (err == ERESTART)
3497 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
3500 if (err2 == 0 && handle_eadir)
3501 err2 = zfs_setattr_dir(attrzp);
3504 zfs_inode_update(zp);
3508 if (os->os_sync == ZFS_SYNC_ALWAYS)
3509 zil_commit(zilog, 0);
3512 kmem_free(xattr_bulk, sizeof (sa_bulk_attr_t) * bulks);
3513 kmem_free(bulk, sizeof (sa_bulk_attr_t) * bulks);
3514 kmem_free(tmpxvattr, sizeof (xvattr_t));
3519 typedef struct zfs_zlock {
3520 krwlock_t *zl_rwlock; /* lock we acquired */
3521 znode_t *zl_znode; /* znode we held */
3522 struct zfs_zlock *zl_next; /* next in list */
3526 * Drop locks and release vnodes that were held by zfs_rename_lock().
3529 zfs_rename_unlock(zfs_zlock_t **zlpp)
3533 while ((zl = *zlpp) != NULL) {
3534 if (zl->zl_znode != NULL)
3535 zfs_iput_async(ZTOI(zl->zl_znode));
3536 rw_exit(zl->zl_rwlock);
3537 *zlpp = zl->zl_next;
3538 kmem_free(zl, sizeof (*zl));
3543 * Search back through the directory tree, using the ".." entries.
3544 * Lock each directory in the chain to prevent concurrent renames.
3545 * Fail any attempt to move a directory into one of its own descendants.
3546 * XXX - z_parent_lock can overlap with map or grow locks
3549 zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp)
3553 uint64_t rootid = ZTOZSB(zp)->z_root;
3554 uint64_t oidp = zp->z_id;
3555 krwlock_t *rwlp = &szp->z_parent_lock;
3556 krw_t rw = RW_WRITER;
3559 * First pass write-locks szp and compares to zp->z_id.
3560 * Later passes read-lock zp and compare to zp->z_parent.
3563 if (!rw_tryenter(rwlp, rw)) {
3565 * Another thread is renaming in this path.
3566 * Note that if we are a WRITER, we don't have any
3567 * parent_locks held yet.
3569 if (rw == RW_READER && zp->z_id > szp->z_id) {
3571 * Drop our locks and restart
3573 zfs_rename_unlock(&zl);
3577 rwlp = &szp->z_parent_lock;
3582 * Wait for other thread to drop its locks
3588 zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
3589 zl->zl_rwlock = rwlp;
3590 zl->zl_znode = NULL;
3591 zl->zl_next = *zlpp;
3594 if (oidp == szp->z_id) /* We're a descendant of szp */
3595 return (SET_ERROR(EINVAL));
3597 if (oidp == rootid) /* We've hit the top */
3600 if (rw == RW_READER) { /* i.e. not the first pass */
3601 int error = zfs_zget(ZTOZSB(zp), oidp, &zp);
3606 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(ZTOZSB(zp)),
3607 &oidp, sizeof (oidp));
3608 rwlp = &zp->z_parent_lock;
3611 } while (zp->z_id != sdzp->z_id);
3617 * Move an entry from the provided source directory to the target
3618 * directory. Change the entry name as indicated.
3620 * IN: sdip - Source directory containing the "old entry".
3621 * snm - Old entry name.
3622 * tdip - Target directory to contain the "new entry".
3623 * tnm - New entry name.
3624 * cr - credentials of caller.
3625 * flags - case flags
3627 * RETURN: 0 on success, error code on failure.
3630 * sdip,tdip - ctime|mtime updated
3634 zfs_rename(struct inode *sdip, char *snm, struct inode *tdip, char *tnm,
3635 cred_t *cr, int flags)
3637 znode_t *tdzp, *szp, *tzp;
3638 znode_t *sdzp = ITOZ(sdip);
3639 zfsvfs_t *zfsvfs = ITOZSB(sdip);
3641 zfs_dirlock_t *sdl, *tdl;
3644 int cmp, serr, terr;
3647 boolean_t waited = B_FALSE;
3649 if (snm == NULL || tnm == NULL)
3650 return (SET_ERROR(EINVAL));
3653 ZFS_VERIFY_ZP(sdzp);
3654 zilog = zfsvfs->z_log;
3657 ZFS_VERIFY_ZP(tdzp);
3660 * We check i_sb because snapshots and the ctldir must have different
3663 if (tdip->i_sb != sdip->i_sb || zfsctl_is_node(tdip)) {
3665 return (SET_ERROR(EXDEV));
3668 if (zfsvfs->z_utf8 && u8_validate(tnm,
3669 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3671 return (SET_ERROR(EILSEQ));
3674 if (flags & FIGNORECASE)
3683 * This is to prevent the creation of links into attribute space
3684 * by renaming a linked file into/outof an attribute directory.
3685 * See the comment in zfs_link() for why this is considered bad.
3687 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
3689 return (SET_ERROR(EINVAL));
3693 * Lock source and target directory entries. To prevent deadlock,
3694 * a lock ordering must be defined. We lock the directory with
3695 * the smallest object id first, or if it's a tie, the one with
3696 * the lexically first name.
3698 if (sdzp->z_id < tdzp->z_id) {
3700 } else if (sdzp->z_id > tdzp->z_id) {
3704 * First compare the two name arguments without
3705 * considering any case folding.
3707 int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER);
3709 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
3710 ASSERT(error == 0 || !zfsvfs->z_utf8);
3713 * POSIX: "If the old argument and the new argument
3714 * both refer to links to the same existing file,
3715 * the rename() function shall return successfully
3716 * and perform no other action."
3722 * If the file system is case-folding, then we may
3723 * have some more checking to do. A case-folding file
3724 * system is either supporting mixed case sensitivity
3725 * access or is completely case-insensitive. Note
3726 * that the file system is always case preserving.
3728 * In mixed sensitivity mode case sensitive behavior
3729 * is the default. FIGNORECASE must be used to
3730 * explicitly request case insensitive behavior.
3732 * If the source and target names provided differ only
3733 * by case (e.g., a request to rename 'tim' to 'Tim'),
3734 * we will treat this as a special case in the
3735 * case-insensitive mode: as long as the source name
3736 * is an exact match, we will allow this to proceed as
3737 * a name-change request.
3739 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
3740 (zfsvfs->z_case == ZFS_CASE_MIXED &&
3741 flags & FIGNORECASE)) &&
3742 u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST,
3745 * case preserving rename request, require exact
3754 * If the source and destination directories are the same, we should
3755 * grab the z_name_lock of that directory only once.
3759 rw_enter(&sdzp->z_name_lock, RW_READER);
3763 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
3764 ZEXISTS | zflg, NULL, NULL);
3765 terr = zfs_dirent_lock(&tdl,
3766 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL);
3768 terr = zfs_dirent_lock(&tdl,
3769 tdzp, tnm, &tzp, zflg, NULL, NULL);
3770 serr = zfs_dirent_lock(&sdl,
3771 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg,
3777 * Source entry invalid or not there.
3780 zfs_dirent_unlock(tdl);
3786 rw_exit(&sdzp->z_name_lock);
3788 if (strcmp(snm, "..") == 0)
3794 zfs_dirent_unlock(sdl);
3798 rw_exit(&sdzp->z_name_lock);
3800 if (strcmp(tnm, "..") == 0)
3807 * If we are using project inheritance, means if the directory has
3808 * ZFS_PROJINHERIT set, then its descendant directories will inherit
3809 * not only the project ID, but also the ZFS_PROJINHERIT flag. Under
3810 * such case, we only allow renames into our tree when the project
3813 if (tdzp->z_pflags & ZFS_PROJINHERIT &&
3814 tdzp->z_projid != szp->z_projid) {
3815 error = SET_ERROR(EXDEV);
3820 * Must have write access at the source to remove the old entry
3821 * and write access at the target to create the new entry.
3822 * Note that if target and source are the same, this can be
3823 * done in a single check.
3826 if ((error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)))
3829 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3831 * Check to make sure rename is valid.
3832 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3834 if ((error = zfs_rename_lock(szp, tdzp, sdzp, &zl)))
3839 * Does target exist?
3843 * Source and target must be the same type.
3845 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3846 if (!S_ISDIR(ZTOI(tzp)->i_mode)) {
3847 error = SET_ERROR(ENOTDIR);
3851 if (S_ISDIR(ZTOI(tzp)->i_mode)) {
3852 error = SET_ERROR(EISDIR);
3857 * POSIX dictates that when the source and target
3858 * entries refer to the same file object, rename
3859 * must do nothing and exit without error.
3861 if (szp->z_id == tzp->z_id) {
3867 tx = dmu_tx_create(zfsvfs->z_os);
3868 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3869 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
3870 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
3871 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
3873 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
3874 zfs_sa_upgrade_txholds(tx, tdzp);
3877 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
3878 zfs_sa_upgrade_txholds(tx, tzp);
3881 zfs_sa_upgrade_txholds(tx, szp);
3882 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
3883 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
3886 zfs_rename_unlock(&zl);
3887 zfs_dirent_unlock(sdl);
3888 zfs_dirent_unlock(tdl);
3891 rw_exit(&sdzp->z_name_lock);
3893 if (error == ERESTART) {
3910 if (tzp) /* Attempt to remove the existing target */
3911 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
3914 error = zfs_link_create(tdl, szp, tx, ZRENAMING);
3916 szp->z_pflags |= ZFS_AV_MODIFIED;
3917 if (tdzp->z_pflags & ZFS_PROJINHERIT)
3918 szp->z_pflags |= ZFS_PROJINHERIT;
3920 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
3921 (void *)&szp->z_pflags, sizeof (uint64_t), tx);
3924 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
3926 zfs_log_rename(zilog, tx, TX_RENAME |
3927 (flags & FIGNORECASE ? TX_CI : 0), sdzp,
3928 sdl->dl_name, tdzp, tdl->dl_name, szp);
3931 * At this point, we have successfully created
3932 * the target name, but have failed to remove
3933 * the source name. Since the create was done
3934 * with the ZRENAMING flag, there are
3935 * complications; for one, the link count is
3936 * wrong. The easiest way to deal with this
3937 * is to remove the newly created target, and
3938 * return the original error. This must
3939 * succeed; fortunately, it is very unlikely to
3940 * fail, since we just created it.
3942 VERIFY3U(zfs_link_destroy(tdl, szp, tx,
3943 ZRENAMING, NULL), ==, 0);
3947 * If we had removed the existing target, subsequent
3948 * call to zfs_link_create() to add back the same entry
3949 * but, the new dnode (szp) should not fail.
3951 ASSERT(tzp == NULL);
3958 zfs_rename_unlock(&zl);
3960 zfs_dirent_unlock(sdl);
3961 zfs_dirent_unlock(tdl);
3963 zfs_inode_update(sdzp);
3965 rw_exit(&sdzp->z_name_lock);
3968 zfs_inode_update(tdzp);
3970 zfs_inode_update(szp);
3973 zfs_inode_update(tzp);
3977 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3978 zil_commit(zilog, 0);
3985 * Insert the indicated symbolic reference entry into the directory.
3987 * IN: dip - Directory to contain new symbolic link.
3988 * link - Name for new symlink entry.
3989 * vap - Attributes of new entry.
3990 * target - Target path of new symlink.
3992 * cr - credentials of caller.
3993 * flags - case flags
3995 * RETURN: 0 on success, error code on failure.
3998 * dip - ctime|mtime updated
4002 zfs_symlink(struct inode *dip, char *name, vattr_t *vap, char *link,
4003 struct inode **ipp, cred_t *cr, int flags)
4005 znode_t *zp, *dzp = ITOZ(dip);
4008 zfsvfs_t *zfsvfs = ITOZSB(dip);
4010 uint64_t len = strlen(link);
4013 zfs_acl_ids_t acl_ids;
4014 boolean_t fuid_dirtied;
4015 uint64_t txtype = TX_SYMLINK;
4016 boolean_t waited = B_FALSE;
4018 ASSERT(S_ISLNK(vap->va_mode));
4021 return (SET_ERROR(EINVAL));
4025 zilog = zfsvfs->z_log;
4027 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
4028 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
4030 return (SET_ERROR(EILSEQ));
4032 if (flags & FIGNORECASE)
4035 if (len > MAXPATHLEN) {
4037 return (SET_ERROR(ENAMETOOLONG));
4040 if ((error = zfs_acl_ids_create(dzp, 0,
4041 vap, cr, NULL, &acl_ids)) != 0) {
4049 * Attempt to lock directory; fail if entry already exists.
4051 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
4053 zfs_acl_ids_free(&acl_ids);
4058 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
4059 zfs_acl_ids_free(&acl_ids);
4060 zfs_dirent_unlock(dl);
4065 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, ZFS_DEFAULT_PROJID)) {
4066 zfs_acl_ids_free(&acl_ids);
4067 zfs_dirent_unlock(dl);
4069 return (SET_ERROR(EDQUOT));
4071 tx = dmu_tx_create(zfsvfs->z_os);
4072 fuid_dirtied = zfsvfs->z_fuid_dirty;
4073 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
4074 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
4075 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
4076 ZFS_SA_BASE_ATTR_SIZE + len);
4077 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
4078 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
4079 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
4080 acl_ids.z_aclp->z_acl_bytes);
4083 zfs_fuid_txhold(zfsvfs, tx);
4084 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
4086 zfs_dirent_unlock(dl);
4087 if (error == ERESTART) {
4093 zfs_acl_ids_free(&acl_ids);
4100 * Create a new object for the symlink.
4101 * for version 4 ZPL datsets the symlink will be an SA attribute
4103 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
4106 zfs_fuid_sync(zfsvfs, tx);
4108 mutex_enter(&zp->z_lock);
4110 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs),
4113 zfs_sa_symlink(zp, link, len, tx);
4114 mutex_exit(&zp->z_lock);
4117 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
4118 &zp->z_size, sizeof (zp->z_size), tx);
4120 * Insert the new object into the directory.
4122 error = zfs_link_create(dl, zp, tx, ZNEW);
4124 zfs_znode_delete(zp, tx);
4125 remove_inode_hash(ZTOI(zp));
4127 if (flags & FIGNORECASE)
4129 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
4131 zfs_inode_update(dzp);
4132 zfs_inode_update(zp);
4135 zfs_acl_ids_free(&acl_ids);
4139 zfs_dirent_unlock(dl);
4144 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4145 zil_commit(zilog, 0);
4155 * Return, in the buffer contained in the provided uio structure,
4156 * the symbolic path referred to by ip.
4158 * IN: ip - inode of symbolic link
4159 * uio - structure to contain the link path.
4160 * cr - credentials of caller.
4162 * RETURN: 0 if success
4163 * error code if failure
4166 * ip - atime updated
4170 zfs_readlink(struct inode *ip, uio_t *uio, cred_t *cr)
4172 znode_t *zp = ITOZ(ip);
4173 zfsvfs_t *zfsvfs = ITOZSB(ip);
4179 mutex_enter(&zp->z_lock);
4181 error = sa_lookup_uio(zp->z_sa_hdl,
4182 SA_ZPL_SYMLINK(zfsvfs), uio);
4184 error = zfs_sa_readlink(zp, uio);
4185 mutex_exit(&zp->z_lock);
4192 * Insert a new entry into directory tdip referencing sip.
4194 * IN: tdip - Directory to contain new entry.
4195 * sip - inode of new entry.
4196 * name - name of new entry.
4197 * cr - credentials of caller.
4199 * RETURN: 0 if success
4200 * error code if failure
4203 * tdip - ctime|mtime updated
4204 * sip - ctime updated
4208 zfs_link(struct inode *tdip, struct inode *sip, char *name, cred_t *cr,
4211 znode_t *dzp = ITOZ(tdip);
4213 zfsvfs_t *zfsvfs = ITOZSB(tdip);
4221 boolean_t waited = B_FALSE;
4222 boolean_t is_tmpfile = 0;
4225 is_tmpfile = (sip->i_nlink == 0 && (sip->i_state & I_LINKABLE));
4227 ASSERT(S_ISDIR(tdip->i_mode));
4230 return (SET_ERROR(EINVAL));
4234 zilog = zfsvfs->z_log;
4237 * POSIX dictates that we return EPERM here.
4238 * Better choices include ENOTSUP or EISDIR.
4240 if (S_ISDIR(sip->i_mode)) {
4242 return (SET_ERROR(EPERM));
4249 * If we are using project inheritance, means if the directory has
4250 * ZFS_PROJINHERIT set, then its descendant directories will inherit
4251 * not only the project ID, but also the ZFS_PROJINHERIT flag. Under
4252 * such case, we only allow hard link creation in our tree when the
4253 * project IDs are the same.
4255 if (dzp->z_pflags & ZFS_PROJINHERIT && dzp->z_projid != szp->z_projid) {
4257 return (SET_ERROR(EXDEV));
4261 * We check i_sb because snapshots and the ctldir must have different
4264 if (sip->i_sb != tdip->i_sb || zfsctl_is_node(sip)) {
4266 return (SET_ERROR(EXDEV));
4269 /* Prevent links to .zfs/shares files */
4271 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
4272 &parent, sizeof (uint64_t))) != 0) {
4276 if (parent == zfsvfs->z_shares_dir) {
4278 return (SET_ERROR(EPERM));
4281 if (zfsvfs->z_utf8 && u8_validate(name,
4282 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
4284 return (SET_ERROR(EILSEQ));
4286 if (flags & FIGNORECASE)
4290 * We do not support links between attributes and non-attributes
4291 * because of the potential security risk of creating links
4292 * into "normal" file space in order to circumvent restrictions
4293 * imposed in attribute space.
4295 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) {
4297 return (SET_ERROR(EINVAL));
4300 owner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(sip->i_uid),
4302 if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
4304 return (SET_ERROR(EPERM));
4307 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
4314 * Attempt to lock directory; fail if entry already exists.
4316 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL);
4322 tx = dmu_tx_create(zfsvfs->z_os);
4323 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
4324 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
4326 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
4328 zfs_sa_upgrade_txholds(tx, szp);
4329 zfs_sa_upgrade_txholds(tx, dzp);
4330 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
4332 zfs_dirent_unlock(dl);
4333 if (error == ERESTART) {
4343 /* unmark z_unlinked so zfs_link_create will not reject */
4345 szp->z_unlinked = 0;
4346 error = zfs_link_create(dl, szp, tx, 0);
4349 uint64_t txtype = TX_LINK;
4351 * tmpfile is created to be in z_unlinkedobj, so remove it.
4352 * Also, we don't log in ZIL, be cause all previous file
4353 * operation on the tmpfile are ignored by ZIL. Instead we
4354 * always wait for txg to sync to make sure all previous
4355 * operation are sync safe.
4358 VERIFY(zap_remove_int(zfsvfs->z_os,
4359 zfsvfs->z_unlinkedobj, szp->z_id, tx) == 0);
4361 if (flags & FIGNORECASE)
4363 zfs_log_link(zilog, tx, txtype, dzp, szp, name);
4365 } else if (is_tmpfile) {
4366 /* restore z_unlinked since when linking failed */
4367 szp->z_unlinked = 1;
4369 txg = dmu_tx_get_txg(tx);
4372 zfs_dirent_unlock(dl);
4374 if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4375 zil_commit(zilog, 0);
4378 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), txg);
4380 zfs_inode_update(dzp);
4381 zfs_inode_update(szp);
4387 zfs_putpage_commit_cb(void *arg)
4389 struct page *pp = arg;
4392 end_page_writeback(pp);
4396 * Push a page out to disk, once the page is on stable storage the
4397 * registered commit callback will be run as notification of completion.
4399 * IN: ip - page mapped for inode.
4400 * pp - page to push (page is locked)
4401 * wbc - writeback control data
4403 * RETURN: 0 if success
4404 * error code if failure
4407 * ip - ctime|mtime updated
4411 zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc)
4413 znode_t *zp = ITOZ(ip);
4414 zfsvfs_t *zfsvfs = ITOZSB(ip);
4421 uint64_t mtime[2], ctime[2];
4422 sa_bulk_attr_t bulk[3];
4424 struct address_space *mapping;
4429 ASSERT(PageLocked(pp));
4431 pgoff = page_offset(pp); /* Page byte-offset in file */
4432 offset = i_size_read(ip); /* File length in bytes */
4433 pglen = MIN(PAGE_SIZE, /* Page length in bytes */
4434 P2ROUNDUP(offset, PAGE_SIZE)-pgoff);
4436 /* Page is beyond end of file */
4437 if (pgoff >= offset) {
4443 /* Truncate page length to end of file */
4444 if (pgoff + pglen > offset)
4445 pglen = offset - pgoff;
4449 * FIXME: Allow mmap writes past its quota. The correct fix
4450 * is to register a page_mkwrite() handler to count the page
4451 * against its quota when it is about to be dirtied.
4453 if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT,
4454 KUID_TO_SUID(ip->i_uid)) ||
4455 zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT,
4456 KGID_TO_SGID(ip->i_gid)) ||
4457 (zp->z_projid != ZFS_DEFAULT_PROJID &&
4458 zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT,
4465 * The ordering here is critical and must adhere to the following
4466 * rules in order to avoid deadlocking in either zfs_read() or
4467 * zfs_free_range() due to a lock inversion.
4469 * 1) The page must be unlocked prior to acquiring the range lock.
4470 * This is critical because zfs_read() calls find_lock_page()
4471 * which may block on the page lock while holding the range lock.
4473 * 2) Before setting or clearing write back on a page the range lock
4474 * must be held in order to prevent a lock inversion with the
4475 * zfs_free_range() function.
4477 * This presents a problem because upon entering this function the
4478 * page lock is already held. To safely acquire the range lock the
4479 * page lock must be dropped. This creates a window where another
4480 * process could truncate, invalidate, dirty, or write out the page.
4482 * Therefore, after successfully reacquiring the range and page locks
4483 * the current page state is checked. In the common case everything
4484 * will be as is expected and it can be written out. However, if
4485 * the page state has changed it must be handled accordingly.
4487 mapping = pp->mapping;
4488 redirty_page_for_writepage(wbc, pp);
4491 locked_range_t *lr = rangelock_enter(&zp->z_rangelock,
4492 pgoff, pglen, RL_WRITER);
4495 /* Page mapping changed or it was no longer dirty, we're done */
4496 if (unlikely((mapping != pp->mapping) || !PageDirty(pp))) {
4503 /* Another process started write block if required */
4504 if (PageWriteback(pp)) {
4508 if (wbc->sync_mode != WB_SYNC_NONE)
4509 wait_on_page_writeback(pp);
4515 /* Clear the dirty flag the required locks are held */
4516 if (!clear_page_dirty_for_io(pp)) {
4524 * Counterpart for redirty_page_for_writepage() above. This page
4525 * was in fact not skipped and should not be counted as if it were.
4527 wbc->pages_skipped--;
4528 set_page_writeback(pp);
4531 tx = dmu_tx_create(zfsvfs->z_os);
4532 dmu_tx_hold_write(tx, zp->z_id, pgoff, pglen);
4533 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4534 zfs_sa_upgrade_txholds(tx, zp);
4536 err = dmu_tx_assign(tx, TXG_NOWAIT);
4538 if (err == ERESTART)
4542 __set_page_dirty_nobuffers(pp);
4544 end_page_writeback(pp);
4551 ASSERT3U(pglen, <=, PAGE_SIZE);
4552 dmu_write(zfsvfs->z_os, zp->z_id, pgoff, pglen, va, tx);
4555 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
4556 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
4557 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_FLAGS(zfsvfs), NULL,
4560 /* Preserve the mtime and ctime provided by the inode */
4561 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4562 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4563 zp->z_atime_dirty = 0;
4566 err = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4568 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, pgoff, pglen, 0,
4569 zfs_putpage_commit_cb, pp);
4574 if (wbc->sync_mode != WB_SYNC_NONE) {
4576 * Note that this is rarely called under writepages(), because
4577 * writepages() normally handles the entire commit for
4578 * performance reasons.
4580 zil_commit(zfsvfs->z_log, zp->z_id);
4588 * Update the system attributes when the inode has been dirtied. For the
4589 * moment we only update the mode, atime, mtime, and ctime.
4592 zfs_dirty_inode(struct inode *ip, int flags)
4594 znode_t *zp = ITOZ(ip);
4595 zfsvfs_t *zfsvfs = ITOZSB(ip);
4597 uint64_t mode, atime[2], mtime[2], ctime[2];
4598 sa_bulk_attr_t bulk[4];
4602 if (zfs_is_readonly(zfsvfs) || dmu_objset_is_snapshot(zfsvfs->z_os))
4610 * This is the lazytime semantic indroduced in Linux 4.0
4611 * This flag will only be called from update_time when lazytime is set.
4612 * (Note, I_DIRTY_SYNC will also set if not lazytime)
4613 * Fortunately mtime and ctime are managed within ZFS itself, so we
4614 * only need to dirty atime.
4616 if (flags == I_DIRTY_TIME) {
4617 zp->z_atime_dirty = 1;
4622 tx = dmu_tx_create(zfsvfs->z_os);
4624 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4625 zfs_sa_upgrade_txholds(tx, zp);
4627 error = dmu_tx_assign(tx, TXG_WAIT);
4633 mutex_enter(&zp->z_lock);
4634 zp->z_atime_dirty = 0;
4636 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
4637 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
4638 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
4639 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
4641 /* Preserve the mode, mtime and ctime provided by the inode */
4642 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4643 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4644 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4649 error = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4650 mutex_exit(&zp->z_lock);
4660 zfs_inactive(struct inode *ip)
4662 znode_t *zp = ITOZ(ip);
4663 zfsvfs_t *zfsvfs = ITOZSB(ip);
4666 int need_unlock = 0;
4668 /* Only read lock if we haven't already write locked, e.g. rollback */
4669 if (!RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)) {
4671 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
4673 if (zp->z_sa_hdl == NULL) {
4675 rw_exit(&zfsvfs->z_teardown_inactive_lock);
4679 if (zp->z_atime_dirty && zp->z_unlinked == 0) {
4680 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);
4682 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4683 zfs_sa_upgrade_txholds(tx, zp);
4684 error = dmu_tx_assign(tx, TXG_WAIT);
4688 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4689 mutex_enter(&zp->z_lock);
4690 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
4691 (void *)&atime, sizeof (atime), tx);
4692 zp->z_atime_dirty = 0;
4693 mutex_exit(&zp->z_lock);
4700 rw_exit(&zfsvfs->z_teardown_inactive_lock);
4704 * Bounds-check the seek operation.
4706 * IN: ip - inode seeking within
4707 * ooff - old file offset
4708 * noffp - pointer to new file offset
4709 * ct - caller context
4711 * RETURN: 0 if success
4712 * EINVAL if new offset invalid
4716 zfs_seek(struct inode *ip, offset_t ooff, offset_t *noffp)
4718 if (S_ISDIR(ip->i_mode))
4720 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
4724 * Fill pages with data from the disk.
4727 zfs_fillpage(struct inode *ip, struct page *pl[], int nr_pages)
4729 znode_t *zp = ITOZ(ip);
4730 zfsvfs_t *zfsvfs = ITOZSB(ip);
4732 struct page *cur_pp;
4733 u_offset_t io_off, total;
4740 io_len = nr_pages << PAGE_SHIFT;
4741 i_size = i_size_read(ip);
4742 io_off = page_offset(pl[0]);
4744 if (io_off + io_len > i_size)
4745 io_len = i_size - io_off;
4748 * Iterate over list of pages and read each page individually.
4751 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
4754 cur_pp = pl[page_idx++];
4756 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
4760 /* convert checksum errors into IO errors */
4762 err = SET_ERROR(EIO);
4771 * Uses zfs_fillpage to read data from the file and fill the pages.
4773 * IN: ip - inode of file to get data from.
4774 * pl - list of pages to read
4775 * nr_pages - number of pages to read
4777 * RETURN: 0 on success, error code on failure.
4780 * vp - atime updated
4784 zfs_getpage(struct inode *ip, struct page *pl[], int nr_pages)
4786 znode_t *zp = ITOZ(ip);
4787 zfsvfs_t *zfsvfs = ITOZSB(ip);
4796 err = zfs_fillpage(ip, pl, nr_pages);
4803 * Check ZFS specific permissions to memory map a section of a file.
4805 * IN: ip - inode of the file to mmap
4807 * addrp - start address in memory region
4808 * len - length of memory region
4809 * vm_flags- address flags
4811 * RETURN: 0 if success
4812 * error code if failure
4816 zfs_map(struct inode *ip, offset_t off, caddr_t *addrp, size_t len,
4817 unsigned long vm_flags)
4819 znode_t *zp = ITOZ(ip);
4820 zfsvfs_t *zfsvfs = ITOZSB(ip);
4825 if ((vm_flags & VM_WRITE) && (zp->z_pflags &
4826 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
4828 return (SET_ERROR(EPERM));
4831 if ((vm_flags & (VM_READ | VM_EXEC)) &&
4832 (zp->z_pflags & ZFS_AV_QUARANTINED)) {
4834 return (SET_ERROR(EACCES));
4837 if (off < 0 || len > MAXOFFSET_T - off) {
4839 return (SET_ERROR(ENXIO));
4847 * convoff - converts the given data (start, whence) to the
4851 convoff(struct inode *ip, flock64_t *lckdat, int whence, offset_t offset)
4856 if ((lckdat->l_whence == 2) || (whence == 2)) {
4857 if ((error = zfs_getattr(ip, &vap, 0, CRED())))
4861 switch (lckdat->l_whence) {
4863 lckdat->l_start += offset;
4866 lckdat->l_start += vap.va_size;
4871 return (SET_ERROR(EINVAL));
4874 if (lckdat->l_start < 0)
4875 return (SET_ERROR(EINVAL));
4879 lckdat->l_start -= offset;
4882 lckdat->l_start -= vap.va_size;
4887 return (SET_ERROR(EINVAL));
4890 lckdat->l_whence = (short)whence;
4895 * Free or allocate space in a file. Currently, this function only
4896 * supports the `F_FREESP' command. However, this command is somewhat
4897 * misnamed, as its functionality includes the ability to allocate as
4898 * well as free space.
4900 * IN: ip - inode of file to free data in.
4901 * cmd - action to take (only F_FREESP supported).
4902 * bfp - section of file to free/alloc.
4903 * flag - current file open mode flags.
4904 * offset - current file offset.
4905 * cr - credentials of caller [UNUSED].
4907 * RETURN: 0 on success, error code on failure.
4910 * ip - ctime|mtime updated
4914 zfs_space(struct inode *ip, int cmd, flock64_t *bfp, int flag,
4915 offset_t offset, cred_t *cr)
4917 znode_t *zp = ITOZ(ip);
4918 zfsvfs_t *zfsvfs = ITOZSB(ip);
4925 if (cmd != F_FREESP) {
4927 return (SET_ERROR(EINVAL));
4931 * Callers might not be able to detect properly that we are read-only,
4932 * so check it explicitly here.
4934 if (zfs_is_readonly(zfsvfs)) {
4936 return (SET_ERROR(EROFS));
4939 if ((error = convoff(ip, bfp, 0, offset))) {
4944 if (bfp->l_len < 0) {
4946 return (SET_ERROR(EINVAL));
4950 * Permissions aren't checked on Solaris because on this OS
4951 * zfs_space() can only be called with an opened file handle.
4952 * On Linux we can get here through truncate_range() which
4953 * operates directly on inodes, so we need to check access rights.
4955 if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr))) {
4961 len = bfp->l_len; /* 0 means from off to end of file */
4963 error = zfs_freesp(zp, off, len, flag, TRUE);
4971 zfs_fid(struct inode *ip, fid_t *fidp)
4973 znode_t *zp = ITOZ(ip);
4974 zfsvfs_t *zfsvfs = ITOZSB(ip);
4977 uint64_t object = zp->z_id;
4984 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
4985 &gen64, sizeof (uint64_t))) != 0) {
4990 gen = (uint32_t)gen64;
4992 size = SHORT_FID_LEN;
4994 zfid = (zfid_short_t *)fidp;
4996 zfid->zf_len = size;
4998 for (i = 0; i < sizeof (zfid->zf_object); i++)
4999 zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
5001 /* Must have a non-zero generation number to distinguish from .zfs */
5004 for (i = 0; i < sizeof (zfid->zf_gen); i++)
5005 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
5013 zfs_getsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
5015 znode_t *zp = ITOZ(ip);
5016 zfsvfs_t *zfsvfs = ITOZSB(ip);
5018 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
5022 error = zfs_getacl(zp, vsecp, skipaclchk, cr);
5030 zfs_setsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
5032 znode_t *zp = ITOZ(ip);
5033 zfsvfs_t *zfsvfs = ITOZSB(ip);
5035 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
5036 zilog_t *zilog = zfsvfs->z_log;
5041 error = zfs_setacl(zp, vsecp, skipaclchk, cr);
5043 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
5044 zil_commit(zilog, 0);
5050 #ifdef HAVE_UIO_ZEROCOPY
5052 * Tunable, both must be a power of 2.
5054 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
5055 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
5056 * an arcbuf for a partial block read
5058 int zcr_blksz_min = (1 << 10); /* 1K */
5059 int zcr_blksz_max = (1 << 17); /* 128K */
5063 zfs_reqzcbuf(struct inode *ip, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr)
5065 znode_t *zp = ITOZ(ip);
5066 zfsvfs_t *zfsvfs = ITOZSB(ip);
5067 int max_blksz = zfsvfs->z_max_blksz;
5068 uio_t *uio = &xuio->xu_uio;
5069 ssize_t size = uio->uio_resid;
5070 offset_t offset = uio->uio_loffset;
5075 int preamble, postamble;
5077 if (xuio->xu_type != UIOTYPE_ZEROCOPY)
5078 return (SET_ERROR(EINVAL));
5085 * Loan out an arc_buf for write if write size is bigger than
5086 * max_blksz, and the file's block size is also max_blksz.
5089 if (size < blksz || zp->z_blksz != blksz) {
5091 return (SET_ERROR(EINVAL));
5094 * Caller requests buffers for write before knowing where the
5095 * write offset might be (e.g. NFS TCP write).
5100 preamble = P2PHASE(offset, blksz);
5102 preamble = blksz - preamble;
5107 postamble = P2PHASE(size, blksz);
5110 fullblk = size / blksz;
5111 (void) dmu_xuio_init(xuio,
5112 (preamble != 0) + fullblk + (postamble != 0));
5115 * Have to fix iov base/len for partial buffers. They
5116 * currently represent full arc_buf's.
5119 /* data begins in the middle of the arc_buf */
5120 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5123 (void) dmu_xuio_add(xuio, abuf,
5124 blksz - preamble, preamble);
5127 for (i = 0; i < fullblk; i++) {
5128 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5131 (void) dmu_xuio_add(xuio, abuf, 0, blksz);
5135 /* data ends in the middle of the arc_buf */
5136 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5139 (void) dmu_xuio_add(xuio, abuf, 0, postamble);
5144 * Loan out an arc_buf for read if the read size is larger than
5145 * the current file block size. Block alignment is not
5146 * considered. Partial arc_buf will be loaned out for read.
5148 blksz = zp->z_blksz;
5149 if (blksz < zcr_blksz_min)
5150 blksz = zcr_blksz_min;
5151 if (blksz > zcr_blksz_max)
5152 blksz = zcr_blksz_max;
5153 /* avoid potential complexity of dealing with it */
5154 if (blksz > max_blksz) {
5156 return (SET_ERROR(EINVAL));
5159 maxsize = zp->z_size - uio->uio_loffset;
5165 return (SET_ERROR(EINVAL));
5170 return (SET_ERROR(EINVAL));
5173 uio->uio_extflg = UIO_XUIO;
5174 XUIO_XUZC_RW(xuio) = ioflag;
5181 zfs_retzcbuf(struct inode *ip, xuio_t *xuio, cred_t *cr)
5185 int ioflag = XUIO_XUZC_RW(xuio);
5187 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY);
5189 i = dmu_xuio_cnt(xuio);
5191 abuf = dmu_xuio_arcbuf(xuio, i);
5193 * if abuf == NULL, it must be a write buffer
5194 * that has been returned in zfs_write().
5197 dmu_return_arcbuf(abuf);
5198 ASSERT(abuf || ioflag == UIO_WRITE);
5201 dmu_xuio_fini(xuio);
5204 #endif /* HAVE_UIO_ZEROCOPY */
5206 #if defined(_KERNEL)
5207 EXPORT_SYMBOL(zfs_open);
5208 EXPORT_SYMBOL(zfs_close);
5209 EXPORT_SYMBOL(zfs_read);
5210 EXPORT_SYMBOL(zfs_write);
5211 EXPORT_SYMBOL(zfs_access);
5212 EXPORT_SYMBOL(zfs_lookup);
5213 EXPORT_SYMBOL(zfs_create);
5214 EXPORT_SYMBOL(zfs_tmpfile);
5215 EXPORT_SYMBOL(zfs_remove);
5216 EXPORT_SYMBOL(zfs_mkdir);
5217 EXPORT_SYMBOL(zfs_rmdir);
5218 EXPORT_SYMBOL(zfs_readdir);
5219 EXPORT_SYMBOL(zfs_fsync);
5220 EXPORT_SYMBOL(zfs_getattr);
5221 EXPORT_SYMBOL(zfs_getattr_fast);
5222 EXPORT_SYMBOL(zfs_setattr);
5223 EXPORT_SYMBOL(zfs_rename);
5224 EXPORT_SYMBOL(zfs_symlink);
5225 EXPORT_SYMBOL(zfs_readlink);
5226 EXPORT_SYMBOL(zfs_link);
5227 EXPORT_SYMBOL(zfs_inactive);
5228 EXPORT_SYMBOL(zfs_space);
5229 EXPORT_SYMBOL(zfs_fid);
5230 EXPORT_SYMBOL(zfs_getsecattr);
5231 EXPORT_SYMBOL(zfs_setsecattr);
5232 EXPORT_SYMBOL(zfs_getpage);
5233 EXPORT_SYMBOL(zfs_putpage);
5234 EXPORT_SYMBOL(zfs_dirty_inode);
5235 EXPORT_SYMBOL(zfs_map);
5238 module_param(zfs_delete_blocks, ulong, 0644);
5239 MODULE_PARM_DESC(zfs_delete_blocks, "Delete files larger than N blocks async");
5240 module_param(zfs_read_chunk_size, long, 0644);
5241 MODULE_PARM_DESC(zfs_read_chunk_size, "Bytes to read per chunk");