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)
442 boolean_t frsync = B_FALSE;
444 znode_t *zp = ITOZ(ip);
445 zfsvfs_t *zfsvfs = ITOZSB(ip);
449 if (zp->z_pflags & ZFS_AV_QUARANTINED) {
451 return (SET_ERROR(EACCES));
455 * Validate file offset
457 if (uio->uio_loffset < (offset_t)0) {
459 return (SET_ERROR(EINVAL));
463 * Fasttrack empty reads
465 if (uio->uio_resid == 0) {
472 * If we're in FRSYNC mode, sync out this znode before reading it.
473 * Only do this for non-snapshots.
475 * Some platforms do not support FRSYNC and instead map it
476 * to FSYNC, which results in unnecessary calls to zil_commit. We
477 * only honor FRSYNC requests on platforms which support it.
479 frsync = !!(ioflag & FRSYNC);
482 (frsync || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS))
483 zil_commit(zfsvfs->z_log, zp->z_id);
486 * Lock the range against changes.
488 locked_range_t *lr = rangelock_enter(&zp->z_rangelock,
489 uio->uio_loffset, uio->uio_resid, RL_READER);
492 * If we are reading past end-of-file we can skip
493 * to the end; but we might still need to set atime.
495 if (uio->uio_loffset >= zp->z_size) {
500 ASSERT(uio->uio_loffset < zp->z_size);
501 ssize_t n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset);
502 ssize_t start_resid = n;
504 #ifdef HAVE_UIO_ZEROCOPY
506 if ((uio->uio_extflg == UIO_XUIO) &&
507 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) {
509 int blksz = zp->z_blksz;
510 uint64_t offset = uio->uio_loffset;
512 xuio = (xuio_t *)uio;
514 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset,
517 ASSERT(offset + n <= blksz);
520 (void) dmu_xuio_init(xuio, nblk);
522 if (vn_has_cached_data(ip)) {
524 * For simplicity, we always allocate a full buffer
525 * even if we only expect to read a portion of a block.
527 while (--nblk >= 0) {
528 (void) dmu_xuio_add(xuio,
529 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
534 #endif /* HAVE_UIO_ZEROCOPY */
537 ssize_t nbytes = MIN(n, zfs_read_chunk_size -
538 P2PHASE(uio->uio_loffset, zfs_read_chunk_size));
540 if (zp->z_is_mapped && !(ioflag & O_DIRECT)) {
541 error = mappedread(ip, nbytes, uio);
543 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
548 /* convert checksum errors into IO errors */
550 error = SET_ERROR(EIO);
557 int64_t nread = start_resid - n;
558 dataset_kstats_update_read_kstats(&zfsvfs->z_kstat, nread);
559 task_io_account_read(nread);
568 * Write the bytes to a file.
570 * IN: ip - inode of file to be written to.
571 * uio - structure supplying write location, range info,
573 * ioflag - FAPPEND flag set if in append mode.
574 * O_DIRECT flag; used to bypass page cache.
575 * cr - credentials of caller.
577 * OUT: uio - updated offset and range.
579 * RETURN: 0 if success
580 * error code if failure
583 * ip - ctime|mtime updated if byte count > 0
588 zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
591 ssize_t start_resid = uio->uio_resid;
594 * Fasttrack empty write
596 ssize_t n = start_resid;
600 rlim64_t limit = uio->uio_limit;
601 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
604 znode_t *zp = ITOZ(ip);
605 zfsvfs_t *zfsvfs = ZTOZSB(zp);
609 sa_bulk_attr_t bulk[4];
611 uint64_t mtime[2], ctime[2];
612 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
613 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
614 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
616 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
620 * Callers might not be able to detect properly that we are read-only,
621 * so check it explicitly here.
623 if (zfs_is_readonly(zfsvfs)) {
625 return (SET_ERROR(EROFS));
629 * If immutable or not appending then return EPERM
631 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
632 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) &&
633 (uio->uio_loffset < zp->z_size))) {
635 return (SET_ERROR(EPERM));
639 * Validate file offset
641 offset_t woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset;
644 return (SET_ERROR(EINVAL));
647 int max_blksz = zfsvfs->z_max_blksz;
651 * Pre-fault the pages to ensure slow (eg NFS) pages
653 * Skip this if uio contains loaned arc_buf.
655 #ifdef HAVE_UIO_ZEROCOPY
656 if ((uio->uio_extflg == UIO_XUIO) &&
657 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY))
658 xuio = (xuio_t *)uio;
661 if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
663 return (SET_ERROR(EFAULT));
667 * If in append mode, set the io offset pointer to eof.
670 if (ioflag & FAPPEND) {
672 * Obtain an appending range lock to guarantee file append
673 * semantics. We reset the write offset once we have the lock.
675 lr = rangelock_enter(&zp->z_rangelock, 0, n, RL_APPEND);
676 woff = lr->lr_offset;
677 if (lr->lr_length == UINT64_MAX) {
679 * We overlocked the file because this write will cause
680 * the file block size to increase.
681 * Note that zp_size cannot change with this lock held.
685 uio->uio_loffset = woff;
688 * Note that if the file block size will change as a result of
689 * this write, then this range lock will lock the entire file
690 * so that we can re-write the block safely.
692 lr = rangelock_enter(&zp->z_rangelock, woff, n, RL_WRITER);
698 return (SET_ERROR(EFBIG));
701 if ((woff + n) > limit || woff > (limit - n))
704 /* Will this write extend the file length? */
705 int write_eof = (woff + n > zp->z_size);
707 uint64_t end_size = MAX(zp->z_size, woff + n);
708 zilog_t *zilog = zfsvfs->z_log;
709 #ifdef HAVE_UIO_ZEROCOPY
711 const iovec_t *iovp = uio->uio_iov;
712 ASSERTV(int iovcnt = uio->uio_iovcnt);
717 * Write the file in reasonable size chunks. Each chunk is written
718 * in a separate transaction; this keeps the intent log records small
719 * and allows us to do more fine-grained space accounting.
722 woff = uio->uio_loffset;
724 if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT,
725 KUID_TO_SUID(ip->i_uid)) ||
726 zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT,
727 KGID_TO_SGID(ip->i_gid)) ||
728 (zp->z_projid != ZFS_DEFAULT_PROJID &&
729 zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT,
731 error = SET_ERROR(EDQUOT);
735 arc_buf_t *abuf = NULL;
736 const iovec_t *aiov = NULL;
738 #ifdef HAVE_UIO_ZEROCOPY
739 ASSERT(i_iov < iovcnt);
740 ASSERT3U(uio->uio_segflg, !=, UIO_BVEC);
742 abuf = dmu_xuio_arcbuf(xuio, i_iov);
743 dmu_xuio_clear(xuio, i_iov);
744 ASSERT((aiov->iov_base == abuf->b_data) ||
745 ((char *)aiov->iov_base - (char *)abuf->b_data +
746 aiov->iov_len == arc_buf_size(abuf)));
749 } else if (n >= max_blksz && woff >= zp->z_size &&
750 P2PHASE(woff, max_blksz) == 0 &&
751 zp->z_blksz == max_blksz) {
753 * This write covers a full block. "Borrow" a buffer
754 * from the dmu so that we can fill it before we enter
755 * a transaction. This avoids the possibility of
756 * holding up the transaction if the data copy hangs
757 * up on a pagefault (e.g., from an NFS server mapping).
761 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
763 ASSERT(abuf != NULL);
764 ASSERT(arc_buf_size(abuf) == max_blksz);
765 if ((error = uiocopy(abuf->b_data, max_blksz,
766 UIO_WRITE, uio, &cbytes))) {
767 dmu_return_arcbuf(abuf);
770 ASSERT(cbytes == max_blksz);
774 * Start a transaction.
776 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);
777 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
778 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz));
779 zfs_sa_upgrade_txholds(tx, zp);
780 error = dmu_tx_assign(tx, TXG_WAIT);
784 dmu_return_arcbuf(abuf);
789 * If rangelock_enter() over-locked we grow the blocksize
790 * and then reduce the lock range. This will only happen
791 * on the first iteration since rangelock_reduce() will
792 * shrink down lr_length to the appropriate size.
794 if (lr->lr_length == UINT64_MAX) {
797 if (zp->z_blksz > max_blksz) {
799 * File's blocksize is already larger than the
800 * "recordsize" property. Only let it grow to
801 * the next power of 2.
803 ASSERT(!ISP2(zp->z_blksz));
804 new_blksz = MIN(end_size,
805 1 << highbit64(zp->z_blksz));
807 new_blksz = MIN(end_size, max_blksz);
809 zfs_grow_blocksize(zp, new_blksz, tx);
810 rangelock_reduce(lr, woff, n);
814 * XXX - should we really limit each write to z_max_blksz?
815 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
817 ssize_t nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz));
821 tx_bytes = uio->uio_resid;
822 uio->uio_fault_disable = B_TRUE;
823 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
825 if (error == EFAULT) {
827 if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
831 } else if (error != 0) {
835 tx_bytes -= uio->uio_resid;
838 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len);
840 * If this is not a full block write, but we are
841 * extending the file past EOF and this data starts
842 * block-aligned, use assign_arcbuf(). Otherwise,
843 * write via dmu_write().
845 if (tx_bytes < max_blksz && (!write_eof ||
846 aiov->iov_base != abuf->b_data)) {
848 dmu_write(zfsvfs->z_os, zp->z_id, woff,
849 /* cppcheck-suppress nullPointer */
850 aiov->iov_len, aiov->iov_base, tx);
851 dmu_return_arcbuf(abuf);
852 xuio_stat_wbuf_copied();
854 ASSERT(xuio || tx_bytes == max_blksz);
855 error = dmu_assign_arcbuf_by_dbuf(
856 sa_get_db(zp->z_sa_hdl), woff, abuf, tx);
858 dmu_return_arcbuf(abuf);
863 ASSERT(tx_bytes <= uio->uio_resid);
864 uioskip(uio, tx_bytes);
866 if (tx_bytes && zp->z_is_mapped && !(ioflag & O_DIRECT)) {
867 update_pages(ip, woff,
868 tx_bytes, zfsvfs->z_os, zp->z_id);
872 * If we made no progress, we're done. If we made even
873 * partial progress, update the znode and ZIL accordingly.
876 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
877 (void *)&zp->z_size, sizeof (uint64_t), tx);
884 * Clear Set-UID/Set-GID bits on successful write if not
885 * privileged and at least one of the execute bits is set.
887 * It would be nice to to this after all writes have
888 * been done, but that would still expose the ISUID/ISGID
889 * to another app after the partial write is committed.
891 * Note: we don't call zfs_fuid_map_id() here because
892 * user 0 is not an ephemeral uid.
894 mutex_enter(&zp->z_acl_lock);
895 uint32_t uid = KUID_TO_SUID(ip->i_uid);
896 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) |
897 (S_IXUSR >> 6))) != 0 &&
898 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 &&
899 secpolicy_vnode_setid_retain(cr,
900 ((zp->z_mode & S_ISUID) != 0 && uid == 0)) != 0) {
902 zp->z_mode &= ~(S_ISUID | S_ISGID);
903 ip->i_mode = newmode = zp->z_mode;
904 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs),
905 (void *)&newmode, sizeof (uint64_t), tx);
907 mutex_exit(&zp->z_acl_lock);
909 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
912 * Update the file size (zp_size) if it has changed;
913 * account for possible concurrent updates.
915 while ((end_size = zp->z_size) < uio->uio_loffset) {
916 (void) atomic_cas_64(&zp->z_size, end_size,
921 * If we are replaying and eof is non zero then force
922 * the file size to the specified eof. Note, there's no
923 * concurrency during replay.
925 if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
926 zp->z_size = zfsvfs->z_replay_eof;
928 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
930 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag,
936 ASSERT(tx_bytes == nbytes);
939 if (!xuio && n > 0) {
940 if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
947 zfs_inode_update(zp);
951 * If we're in replay mode, or we made no progress, return error.
952 * Otherwise, it's at least a partial write, so it's successful.
954 if (zfsvfs->z_replay || uio->uio_resid == start_resid) {
959 if (ioflag & (FSYNC | FDSYNC) ||
960 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
961 zil_commit(zilog, zp->z_id);
963 int64_t nwritten = start_resid - uio->uio_resid;
964 dataset_kstats_update_write_kstats(&zfsvfs->z_kstat, nwritten);
965 task_io_account_write(nwritten);
972 * Drop a reference on the passed inode asynchronously. This ensures
973 * that the caller will never drop the last reference on an inode in
974 * the current context. Doing so while holding open a tx could result
975 * in a deadlock if iput_final() re-enters the filesystem code.
978 zfs_iput_async(struct inode *ip)
980 objset_t *os = ITOZSB(ip)->z_os;
982 ASSERT(atomic_read(&ip->i_count) > 0);
985 if (atomic_read(&ip->i_count) == 1)
986 VERIFY(taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os)),
987 (task_func_t *)iput, ip, TQ_SLEEP) != TASKQID_INVALID);
994 zfs_get_done(zgd_t *zgd, int error)
996 znode_t *zp = zgd->zgd_private;
999 dmu_buf_rele(zgd->zgd_db, zgd);
1001 rangelock_exit(zgd->zgd_lr);
1004 * Release the vnode asynchronously as we currently have the
1005 * txg stopped from syncing.
1007 zfs_iput_async(ZTOI(zp));
1009 kmem_free(zgd, sizeof (zgd_t));
1013 static int zil_fault_io = 0;
1017 * Get data to generate a TX_WRITE intent log record.
1020 zfs_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio)
1022 zfsvfs_t *zfsvfs = arg;
1023 objset_t *os = zfsvfs->z_os;
1025 uint64_t object = lr->lr_foid;
1026 uint64_t offset = lr->lr_offset;
1027 uint64_t size = lr->lr_length;
1032 ASSERT3P(lwb, !=, NULL);
1033 ASSERT3P(zio, !=, NULL);
1034 ASSERT3U(size, !=, 0);
1037 * Nothing to do if the file has been removed
1039 if (zfs_zget(zfsvfs, object, &zp) != 0)
1040 return (SET_ERROR(ENOENT));
1041 if (zp->z_unlinked) {
1043 * Release the vnode asynchronously as we currently have the
1044 * txg stopped from syncing.
1046 zfs_iput_async(ZTOI(zp));
1047 return (SET_ERROR(ENOENT));
1050 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1052 zgd->zgd_private = zp;
1055 * Write records come in two flavors: immediate and indirect.
1056 * For small writes it's cheaper to store the data with the
1057 * log record (immediate); for large writes it's cheaper to
1058 * sync the data and get a pointer to it (indirect) so that
1059 * we don't have to write the data twice.
1061 if (buf != NULL) { /* immediate write */
1062 zgd->zgd_lr = rangelock_enter(&zp->z_rangelock,
1063 offset, size, RL_READER);
1064 /* test for truncation needs to be done while range locked */
1065 if (offset >= zp->z_size) {
1066 error = SET_ERROR(ENOENT);
1068 error = dmu_read(os, object, offset, size, buf,
1069 DMU_READ_NO_PREFETCH);
1071 ASSERT(error == 0 || error == ENOENT);
1072 } else { /* indirect write */
1074 * Have to lock the whole block to ensure when it's
1075 * written out and its checksum is being calculated
1076 * that no one can change the data. We need to re-check
1077 * blocksize after we get the lock in case it's changed!
1082 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset;
1084 zgd->zgd_lr = rangelock_enter(&zp->z_rangelock,
1085 offset, size, RL_READER);
1086 if (zp->z_blksz == size)
1089 rangelock_exit(zgd->zgd_lr);
1091 /* test for truncation needs to be done while range locked */
1092 if (lr->lr_offset >= zp->z_size)
1093 error = SET_ERROR(ENOENT);
1096 error = SET_ERROR(EIO);
1101 error = dmu_buf_hold(os, object, offset, zgd, &db,
1102 DMU_READ_NO_PREFETCH);
1105 blkptr_t *bp = &lr->lr_blkptr;
1110 ASSERT(db->db_offset == offset);
1111 ASSERT(db->db_size == size);
1113 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1115 ASSERT(error || lr->lr_length <= size);
1118 * On success, we need to wait for the write I/O
1119 * initiated by dmu_sync() to complete before we can
1120 * release this dbuf. We will finish everything up
1121 * in the zfs_get_done() callback.
1126 if (error == EALREADY) {
1127 lr->lr_common.lrc_txtype = TX_WRITE2;
1129 * TX_WRITE2 relies on the data previously
1130 * written by the TX_WRITE that caused
1131 * EALREADY. We zero out the BP because
1132 * it is the old, currently-on-disk BP.
1141 zfs_get_done(zgd, error);
1148 zfs_access(struct inode *ip, int mode, int flag, cred_t *cr)
1150 znode_t *zp = ITOZ(ip);
1151 zfsvfs_t *zfsvfs = ITOZSB(ip);
1157 if (flag & V_ACE_MASK)
1158 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
1160 error = zfs_zaccess_rwx(zp, mode, flag, cr);
1167 * Lookup an entry in a directory, or an extended attribute directory.
1168 * If it exists, return a held inode reference for it.
1170 * IN: dip - inode of directory to search.
1171 * nm - name of entry to lookup.
1172 * flags - LOOKUP_XATTR set if looking for an attribute.
1173 * cr - credentials of caller.
1174 * direntflags - directory lookup flags
1175 * realpnp - returned pathname.
1177 * OUT: ipp - inode of located entry, NULL if not found.
1179 * RETURN: 0 on success, error code on failure.
1186 zfs_lookup(struct inode *dip, char *nm, struct inode **ipp, int flags,
1187 cred_t *cr, int *direntflags, pathname_t *realpnp)
1189 znode_t *zdp = ITOZ(dip);
1190 zfsvfs_t *zfsvfs = ITOZSB(dip);
1194 * Fast path lookup, however we must skip DNLC lookup
1195 * for case folding or normalizing lookups because the
1196 * DNLC code only stores the passed in name. This means
1197 * creating 'a' and removing 'A' on a case insensitive
1198 * file system would work, but DNLC still thinks 'a'
1199 * exists and won't let you create it again on the next
1200 * pass through fast path.
1202 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
1204 if (!S_ISDIR(dip->i_mode)) {
1205 return (SET_ERROR(ENOTDIR));
1206 } else if (zdp->z_sa_hdl == NULL) {
1207 return (SET_ERROR(EIO));
1210 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
1211 error = zfs_fastaccesschk_execute(zdp, cr);
1226 if (flags & LOOKUP_XATTR) {
1228 * We don't allow recursive attributes..
1229 * Maybe someday we will.
1231 if (zdp->z_pflags & ZFS_XATTR) {
1233 return (SET_ERROR(EINVAL));
1236 if ((error = zfs_get_xattrdir(zdp, ipp, cr, flags))) {
1242 * Do we have permission to get into attribute directory?
1245 if ((error = zfs_zaccess(ITOZ(*ipp), ACE_EXECUTE, 0,
1255 if (!S_ISDIR(dip->i_mode)) {
1257 return (SET_ERROR(ENOTDIR));
1261 * Check accessibility of directory.
1264 if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr))) {
1269 if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
1270 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1272 return (SET_ERROR(EILSEQ));
1275 error = zfs_dirlook(zdp, nm, ipp, flags, direntflags, realpnp);
1276 if ((error == 0) && (*ipp))
1277 zfs_inode_update(ITOZ(*ipp));
1284 * Attempt to create a new entry in a directory. If the entry
1285 * already exists, truncate the file if permissible, else return
1286 * an error. Return the ip of the created or trunc'd file.
1288 * IN: dip - inode of directory to put new file entry in.
1289 * name - name of new file entry.
1290 * vap - attributes of new file.
1291 * excl - flag indicating exclusive or non-exclusive mode.
1292 * mode - mode to open file with.
1293 * cr - credentials of caller.
1295 * vsecp - ACL to be set
1297 * OUT: ipp - inode of created or trunc'd entry.
1299 * RETURN: 0 on success, error code on failure.
1302 * dip - ctime|mtime updated if new entry created
1303 * ip - ctime|mtime always, atime if new
1308 zfs_create(struct inode *dip, char *name, vattr_t *vap, int excl,
1309 int mode, struct inode **ipp, cred_t *cr, int flag, vsecattr_t *vsecp)
1311 znode_t *zp, *dzp = ITOZ(dip);
1312 zfsvfs_t *zfsvfs = ITOZSB(dip);
1320 zfs_acl_ids_t acl_ids;
1321 boolean_t fuid_dirtied;
1322 boolean_t have_acl = B_FALSE;
1323 boolean_t waited = B_FALSE;
1326 * If we have an ephemeral id, ACL, or XVATTR then
1327 * make sure file system is at proper version
1333 if (zfsvfs->z_use_fuids == B_FALSE &&
1334 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1335 return (SET_ERROR(EINVAL));
1338 return (SET_ERROR(EINVAL));
1343 zilog = zfsvfs->z_log;
1345 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
1346 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1348 return (SET_ERROR(EILSEQ));
1351 if (vap->va_mask & ATTR_XVATTR) {
1352 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1353 crgetuid(cr), cr, vap->va_mode)) != 0) {
1361 if (*name == '\0') {
1363 * Null component name refers to the directory itself.
1370 /* possible igrab(zp) */
1373 if (flag & FIGNORECASE)
1376 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1380 zfs_acl_ids_free(&acl_ids);
1381 if (strcmp(name, "..") == 0)
1382 error = SET_ERROR(EISDIR);
1390 uint64_t projid = ZFS_DEFAULT_PROJID;
1393 * Create a new file object and update the directory
1396 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
1398 zfs_acl_ids_free(&acl_ids);
1403 * We only support the creation of regular files in
1404 * extended attribute directories.
1407 if ((dzp->z_pflags & ZFS_XATTR) && !S_ISREG(vap->va_mode)) {
1409 zfs_acl_ids_free(&acl_ids);
1410 error = SET_ERROR(EINVAL);
1414 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1415 cr, vsecp, &acl_ids)) != 0)
1419 if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode))
1420 projid = zfs_inherit_projid(dzp);
1421 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
1422 zfs_acl_ids_free(&acl_ids);
1423 error = SET_ERROR(EDQUOT);
1427 tx = dmu_tx_create(os);
1429 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1430 ZFS_SA_BASE_ATTR_SIZE);
1432 fuid_dirtied = zfsvfs->z_fuid_dirty;
1434 zfs_fuid_txhold(zfsvfs, tx);
1435 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
1436 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
1437 if (!zfsvfs->z_use_sa &&
1438 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1439 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1440 0, acl_ids.z_aclp->z_acl_bytes);
1443 error = dmu_tx_assign(tx,
1444 (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
1446 zfs_dirent_unlock(dl);
1447 if (error == ERESTART) {
1453 zfs_acl_ids_free(&acl_ids);
1458 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1460 error = zfs_link_create(dl, zp, tx, ZNEW);
1463 * Since, we failed to add the directory entry for it,
1464 * delete the newly created dnode.
1466 zfs_znode_delete(zp, tx);
1467 remove_inode_hash(ZTOI(zp));
1468 zfs_acl_ids_free(&acl_ids);
1474 zfs_fuid_sync(zfsvfs, tx);
1476 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
1477 if (flag & FIGNORECASE)
1479 zfs_log_create(zilog, tx, txtype, dzp, zp, name,
1480 vsecp, acl_ids.z_fuidp, vap);
1481 zfs_acl_ids_free(&acl_ids);
1484 int aflags = (flag & FAPPEND) ? V_APPEND : 0;
1487 zfs_acl_ids_free(&acl_ids);
1491 * A directory entry already exists for this name.
1494 * Can't truncate an existing file if in exclusive mode.
1497 error = SET_ERROR(EEXIST);
1501 * Can't open a directory for writing.
1503 if (S_ISDIR(ZTOI(zp)->i_mode)) {
1504 error = SET_ERROR(EISDIR);
1508 * Verify requested access to file.
1510 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
1514 mutex_enter(&dzp->z_lock);
1516 mutex_exit(&dzp->z_lock);
1519 * Truncate regular files if requested.
1521 if (S_ISREG(ZTOI(zp)->i_mode) &&
1522 (vap->va_mask & ATTR_SIZE) && (vap->va_size == 0)) {
1523 /* we can't hold any locks when calling zfs_freesp() */
1525 zfs_dirent_unlock(dl);
1528 error = zfs_freesp(zp, 0, 0, mode, TRUE);
1534 zfs_dirent_unlock(dl);
1540 zfs_inode_update(dzp);
1541 zfs_inode_update(zp);
1545 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1546 zil_commit(zilog, 0);
1554 zfs_tmpfile(struct inode *dip, vattr_t *vap, int excl,
1555 int mode, struct inode **ipp, cred_t *cr, int flag, vsecattr_t *vsecp)
1557 znode_t *zp = NULL, *dzp = ITOZ(dip);
1558 zfsvfs_t *zfsvfs = ITOZSB(dip);
1564 zfs_acl_ids_t acl_ids;
1565 uint64_t projid = ZFS_DEFAULT_PROJID;
1566 boolean_t fuid_dirtied;
1567 boolean_t have_acl = B_FALSE;
1568 boolean_t waited = B_FALSE;
1571 * If we have an ephemeral id, ACL, or XVATTR then
1572 * make sure file system is at proper version
1578 if (zfsvfs->z_use_fuids == B_FALSE &&
1579 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1580 return (SET_ERROR(EINVAL));
1586 if (vap->va_mask & ATTR_XVATTR) {
1587 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1588 crgetuid(cr), cr, vap->va_mode)) != 0) {
1598 * Create a new file object and update the directory
1601 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
1603 zfs_acl_ids_free(&acl_ids);
1607 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1608 cr, vsecp, &acl_ids)) != 0)
1612 if (S_ISREG(vap->va_mode) || S_ISDIR(vap->va_mode))
1613 projid = zfs_inherit_projid(dzp);
1614 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, projid)) {
1615 zfs_acl_ids_free(&acl_ids);
1616 error = SET_ERROR(EDQUOT);
1620 tx = dmu_tx_create(os);
1622 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1623 ZFS_SA_BASE_ATTR_SIZE);
1624 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
1626 fuid_dirtied = zfsvfs->z_fuid_dirty;
1628 zfs_fuid_txhold(zfsvfs, tx);
1629 if (!zfsvfs->z_use_sa &&
1630 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1631 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1632 0, acl_ids.z_aclp->z_acl_bytes);
1634 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
1636 if (error == ERESTART) {
1642 zfs_acl_ids_free(&acl_ids);
1647 zfs_mknode(dzp, vap, tx, cr, IS_TMPFILE, &zp, &acl_ids);
1650 zfs_fuid_sync(zfsvfs, tx);
1652 /* Add to unlinked set */
1654 zfs_unlinked_add(zp, tx);
1655 zfs_acl_ids_free(&acl_ids);
1663 zfs_inode_update(dzp);
1664 zfs_inode_update(zp);
1673 * Remove an entry from a directory.
1675 * IN: dip - inode of directory to remove entry from.
1676 * name - name of entry to remove.
1677 * cr - credentials of caller.
1679 * RETURN: 0 if success
1680 * error code if failure
1684 * ip - ctime (if nlink > 0)
1687 uint64_t null_xattr = 0;
1691 zfs_remove(struct inode *dip, char *name, cred_t *cr, int flags)
1693 znode_t *zp, *dzp = ITOZ(dip);
1696 zfsvfs_t *zfsvfs = ITOZSB(dip);
1698 uint64_t acl_obj, xattr_obj;
1699 uint64_t xattr_obj_unlinked = 0;
1704 boolean_t may_delete_now, delete_now = FALSE;
1705 boolean_t unlinked, toobig = FALSE;
1707 pathname_t *realnmp = NULL;
1711 boolean_t waited = B_FALSE;
1714 return (SET_ERROR(EINVAL));
1718 zilog = zfsvfs->z_log;
1720 if (flags & FIGNORECASE) {
1730 * Attempt to lock directory; fail if entry doesn't exist.
1732 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1742 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
1747 * Need to use rmdir for removing directories.
1749 if (S_ISDIR(ip->i_mode)) {
1750 error = SET_ERROR(EPERM);
1754 mutex_enter(&zp->z_lock);
1755 may_delete_now = atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped);
1756 mutex_exit(&zp->z_lock);
1759 * We may delete the znode now, or we may put it in the unlinked set;
1760 * it depends on whether we're the last link, and on whether there are
1761 * other holds on the inode. So we dmu_tx_hold() the right things to
1762 * allow for either case.
1765 tx = dmu_tx_create(zfsvfs->z_os);
1766 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
1767 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1768 zfs_sa_upgrade_txholds(tx, zp);
1769 zfs_sa_upgrade_txholds(tx, dzp);
1770 if (may_delete_now) {
1771 toobig = zp->z_size > zp->z_blksz * zfs_delete_blocks;
1772 /* if the file is too big, only hold_free a token amount */
1773 dmu_tx_hold_free(tx, zp->z_id, 0,
1774 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
1777 /* are there any extended attributes? */
1778 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1779 &xattr_obj, sizeof (xattr_obj));
1780 if (error == 0 && xattr_obj) {
1781 error = zfs_zget(zfsvfs, xattr_obj, &xzp);
1783 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1784 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
1787 mutex_enter(&zp->z_lock);
1788 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
1789 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
1790 mutex_exit(&zp->z_lock);
1792 /* charge as an update -- would be nice not to charge at all */
1793 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
1796 * Mark this transaction as typically resulting in a net free of space
1798 dmu_tx_mark_netfree(tx);
1800 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
1802 zfs_dirent_unlock(dl);
1803 if (error == ERESTART) {
1823 * Remove the directory entry.
1825 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
1834 * Hold z_lock so that we can make sure that the ACL obj
1835 * hasn't changed. Could have been deleted due to
1838 mutex_enter(&zp->z_lock);
1839 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1840 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
1841 delete_now = may_delete_now && !toobig &&
1842 atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped) &&
1843 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) ==
1848 if (xattr_obj_unlinked) {
1849 ASSERT3U(ZTOI(xzp)->i_nlink, ==, 2);
1850 mutex_enter(&xzp->z_lock);
1851 xzp->z_unlinked = 1;
1852 clear_nlink(ZTOI(xzp));
1854 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
1855 &links, sizeof (links), tx);
1856 ASSERT3U(error, ==, 0);
1857 mutex_exit(&xzp->z_lock);
1858 zfs_unlinked_add(xzp, tx);
1861 error = sa_remove(zp->z_sa_hdl,
1862 SA_ZPL_XATTR(zfsvfs), tx);
1864 error = sa_update(zp->z_sa_hdl,
1865 SA_ZPL_XATTR(zfsvfs), &null_xattr,
1866 sizeof (uint64_t), tx);
1870 * Add to the unlinked set because a new reference could be
1871 * taken concurrently resulting in a deferred destruction.
1873 zfs_unlinked_add(zp, tx);
1874 mutex_exit(&zp->z_lock);
1875 } else if (unlinked) {
1876 mutex_exit(&zp->z_lock);
1877 zfs_unlinked_add(zp, tx);
1881 if (flags & FIGNORECASE)
1883 zfs_log_remove(zilog, tx, txtype, dzp, name, obj);
1890 zfs_dirent_unlock(dl);
1891 zfs_inode_update(dzp);
1892 zfs_inode_update(zp);
1900 zfs_inode_update(xzp);
1901 zfs_iput_async(ZTOI(xzp));
1904 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1905 zil_commit(zilog, 0);
1912 * Create a new directory and insert it into dip using the name
1913 * provided. Return a pointer to the inserted directory.
1915 * IN: dip - inode of directory to add subdir to.
1916 * dirname - name of new directory.
1917 * vap - attributes of new directory.
1918 * cr - credentials of caller.
1919 * vsecp - ACL to be set
1921 * OUT: ipp - inode of created directory.
1923 * RETURN: 0 if success
1924 * error code if failure
1927 * dip - ctime|mtime updated
1928 * ipp - ctime|mtime|atime updated
1932 zfs_mkdir(struct inode *dip, char *dirname, vattr_t *vap, struct inode **ipp,
1933 cred_t *cr, int flags, vsecattr_t *vsecp)
1935 znode_t *zp, *dzp = ITOZ(dip);
1936 zfsvfs_t *zfsvfs = ITOZSB(dip);
1944 gid_t gid = crgetgid(cr);
1945 zfs_acl_ids_t acl_ids;
1946 boolean_t fuid_dirtied;
1947 boolean_t waited = B_FALSE;
1949 ASSERT(S_ISDIR(vap->va_mode));
1952 * If we have an ephemeral id, ACL, or XVATTR then
1953 * make sure file system is at proper version
1957 if (zfsvfs->z_use_fuids == B_FALSE &&
1958 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1959 return (SET_ERROR(EINVAL));
1961 if (dirname == NULL)
1962 return (SET_ERROR(EINVAL));
1966 zilog = zfsvfs->z_log;
1968 if (dzp->z_pflags & ZFS_XATTR) {
1970 return (SET_ERROR(EINVAL));
1973 if (zfsvfs->z_utf8 && u8_validate(dirname,
1974 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1976 return (SET_ERROR(EILSEQ));
1978 if (flags & FIGNORECASE)
1981 if (vap->va_mask & ATTR_XVATTR) {
1982 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1983 crgetuid(cr), cr, vap->va_mode)) != 0) {
1989 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
1990 vsecp, &acl_ids)) != 0) {
1995 * First make sure the new directory doesn't exist.
1997 * Existence is checked first to make sure we don't return
1998 * EACCES instead of EEXIST which can cause some applications
2004 if ((error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
2006 zfs_acl_ids_free(&acl_ids);
2011 if ((error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr))) {
2012 zfs_acl_ids_free(&acl_ids);
2013 zfs_dirent_unlock(dl);
2018 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zfs_inherit_projid(dzp))) {
2019 zfs_acl_ids_free(&acl_ids);
2020 zfs_dirent_unlock(dl);
2022 return (SET_ERROR(EDQUOT));
2026 * Add a new entry to the directory.
2028 tx = dmu_tx_create(zfsvfs->z_os);
2029 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
2030 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
2031 fuid_dirtied = zfsvfs->z_fuid_dirty;
2033 zfs_fuid_txhold(zfsvfs, tx);
2034 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
2035 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
2036 acl_ids.z_aclp->z_acl_bytes);
2039 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
2040 ZFS_SA_BASE_ATTR_SIZE);
2042 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
2044 zfs_dirent_unlock(dl);
2045 if (error == ERESTART) {
2051 zfs_acl_ids_free(&acl_ids);
2060 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
2063 * Now put new name in parent dir.
2065 error = zfs_link_create(dl, zp, tx, ZNEW);
2067 zfs_znode_delete(zp, tx);
2068 remove_inode_hash(ZTOI(zp));
2073 zfs_fuid_sync(zfsvfs, tx);
2077 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
2078 if (flags & FIGNORECASE)
2080 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
2081 acl_ids.z_fuidp, vap);
2084 zfs_acl_ids_free(&acl_ids);
2088 zfs_dirent_unlock(dl);
2090 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
2091 zil_commit(zilog, 0);
2096 zfs_inode_update(dzp);
2097 zfs_inode_update(zp);
2104 * Remove a directory subdir entry. If the current working
2105 * directory is the same as the subdir to be removed, the
2108 * IN: dip - inode of directory to remove from.
2109 * name - name of directory to be removed.
2110 * cwd - inode of current working directory.
2111 * cr - credentials of caller.
2112 * flags - case flags
2114 * RETURN: 0 on success, error code on failure.
2117 * dip - ctime|mtime updated
2121 zfs_rmdir(struct inode *dip, char *name, struct inode *cwd, cred_t *cr,
2124 znode_t *dzp = ITOZ(dip);
2127 zfsvfs_t *zfsvfs = ITOZSB(dip);
2133 boolean_t waited = B_FALSE;
2136 return (SET_ERROR(EINVAL));
2140 zilog = zfsvfs->z_log;
2142 if (flags & FIGNORECASE)
2148 * Attempt to lock directory; fail if entry doesn't exist.
2150 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
2158 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
2162 if (!S_ISDIR(ip->i_mode)) {
2163 error = SET_ERROR(ENOTDIR);
2168 error = SET_ERROR(EINVAL);
2173 * Grab a lock on the directory to make sure that no one is
2174 * trying to add (or lookup) entries while we are removing it.
2176 rw_enter(&zp->z_name_lock, RW_WRITER);
2179 * Grab a lock on the parent pointer to make sure we play well
2180 * with the treewalk and directory rename code.
2182 rw_enter(&zp->z_parent_lock, RW_WRITER);
2184 tx = dmu_tx_create(zfsvfs->z_os);
2185 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
2186 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2187 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
2188 zfs_sa_upgrade_txholds(tx, zp);
2189 zfs_sa_upgrade_txholds(tx, dzp);
2190 dmu_tx_mark_netfree(tx);
2191 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
2193 rw_exit(&zp->z_parent_lock);
2194 rw_exit(&zp->z_name_lock);
2195 zfs_dirent_unlock(dl);
2196 if (error == ERESTART) {
2209 error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
2212 uint64_t txtype = TX_RMDIR;
2213 if (flags & FIGNORECASE)
2215 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT);
2220 rw_exit(&zp->z_parent_lock);
2221 rw_exit(&zp->z_name_lock);
2223 zfs_dirent_unlock(dl);
2225 zfs_inode_update(dzp);
2226 zfs_inode_update(zp);
2229 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
2230 zil_commit(zilog, 0);
2237 * Read as many directory entries as will fit into the provided
2238 * dirent buffer from the given directory cursor position.
2240 * IN: ip - inode of directory to read.
2241 * dirent - buffer for directory entries.
2243 * OUT: dirent - filler buffer of directory entries.
2245 * RETURN: 0 if success
2246 * error code if failure
2249 * ip - atime updated
2251 * Note that the low 4 bits of the cookie returned by zap is always zero.
2252 * This allows us to use the low range for "special" directory entries:
2253 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2254 * we use the offset 2 for the '.zfs' directory.
2258 zfs_readdir(struct inode *ip, zpl_dir_context_t *ctx, cred_t *cr)
2260 znode_t *zp = ITOZ(ip);
2261 zfsvfs_t *zfsvfs = ITOZSB(ip);
2264 zap_attribute_t zap;
2270 uint64_t offset; /* must be unsigned; checks for < 1 */
2275 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
2276 &parent, sizeof (parent))) != 0)
2280 * Quit if directory has been removed (posix)
2288 prefetch = zp->z_zn_prefetch;
2291 * Initialize the iterator cursor.
2295 * Start iteration from the beginning of the directory.
2297 zap_cursor_init(&zc, os, zp->z_id);
2300 * The offset is a serialized cursor.
2302 zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
2306 * Transform to file-system independent format
2311 * Special case `.', `..', and `.zfs'.
2314 (void) strcpy(zap.za_name, ".");
2315 zap.za_normalization_conflict = 0;
2318 } else if (offset == 1) {
2319 (void) strcpy(zap.za_name, "..");
2320 zap.za_normalization_conflict = 0;
2323 } else if (offset == 2 && zfs_show_ctldir(zp)) {
2324 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
2325 zap.za_normalization_conflict = 0;
2326 objnum = ZFSCTL_INO_ROOT;
2332 if ((error = zap_cursor_retrieve(&zc, &zap))) {
2333 if (error == ENOENT)
2340 * Allow multiple entries provided the first entry is
2341 * the object id. Non-zpl consumers may safely make
2342 * use of the additional space.
2344 * XXX: This should be a feature flag for compatibility
2346 if (zap.za_integer_length != 8 ||
2347 zap.za_num_integers == 0) {
2348 cmn_err(CE_WARN, "zap_readdir: bad directory "
2349 "entry, obj = %lld, offset = %lld, "
2350 "length = %d, num = %lld\n",
2351 (u_longlong_t)zp->z_id,
2352 (u_longlong_t)offset,
2353 zap.za_integer_length,
2354 (u_longlong_t)zap.za_num_integers);
2355 error = SET_ERROR(ENXIO);
2359 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
2360 type = ZFS_DIRENT_TYPE(zap.za_first_integer);
2363 done = !zpl_dir_emit(ctx, zap.za_name, strlen(zap.za_name),
2368 /* Prefetch znode */
2370 dmu_prefetch(os, objnum, 0, 0, 0,
2371 ZIO_PRIORITY_SYNC_READ);
2375 * Move to the next entry, fill in the previous offset.
2377 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) {
2378 zap_cursor_advance(&zc);
2379 offset = zap_cursor_serialize(&zc);
2385 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
2388 zap_cursor_fini(&zc);
2389 if (error == ENOENT)
2397 ulong_t zfs_fsync_sync_cnt = 4;
2400 zfs_fsync(struct inode *ip, int syncflag, cred_t *cr)
2402 znode_t *zp = ITOZ(ip);
2403 zfsvfs_t *zfsvfs = ITOZSB(ip);
2405 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt);
2407 if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
2410 zil_commit(zfsvfs->z_log, zp->z_id);
2413 tsd_set(zfs_fsyncer_key, NULL);
2420 * Get the requested file attributes and place them in the provided
2423 * IN: ip - inode of file.
2424 * vap - va_mask identifies requested attributes.
2425 * If ATTR_XVATTR set, then optional attrs are requested
2426 * flags - ATTR_NOACLCHECK (CIFS server context)
2427 * cr - credentials of caller.
2429 * OUT: vap - attribute values.
2431 * RETURN: 0 (always succeeds)
2435 zfs_getattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2437 znode_t *zp = ITOZ(ip);
2438 zfsvfs_t *zfsvfs = ITOZSB(ip);
2441 uint64_t atime[2], mtime[2], ctime[2];
2442 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2443 xoptattr_t *xoap = NULL;
2444 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2445 sa_bulk_attr_t bulk[3];
2451 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);
2453 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
2454 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
2455 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
2457 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
2463 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2464 * Also, if we are the owner don't bother, since owner should
2465 * always be allowed to read basic attributes of file.
2467 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
2468 (vap->va_uid != crgetuid(cr))) {
2469 if ((error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
2477 * Return all attributes. It's cheaper to provide the answer
2478 * than to determine whether we were asked the question.
2481 mutex_enter(&zp->z_lock);
2482 vap->va_type = vn_mode_to_vtype(zp->z_mode);
2483 vap->va_mode = zp->z_mode;
2484 vap->va_fsid = ZTOI(zp)->i_sb->s_dev;
2485 vap->va_nodeid = zp->z_id;
2486 if ((zp->z_id == zfsvfs->z_root) && zfs_show_ctldir(zp))
2487 links = ZTOI(zp)->i_nlink + 1;
2489 links = ZTOI(zp)->i_nlink;
2490 vap->va_nlink = MIN(links, ZFS_LINK_MAX);
2491 vap->va_size = i_size_read(ip);
2492 vap->va_rdev = ip->i_rdev;
2493 vap->va_seq = ip->i_generation;
2496 * Add in any requested optional attributes and the create time.
2497 * Also set the corresponding bits in the returned attribute bitmap.
2499 if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) {
2500 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
2502 ((zp->z_pflags & ZFS_ARCHIVE) != 0);
2503 XVA_SET_RTN(xvap, XAT_ARCHIVE);
2506 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
2507 xoap->xoa_readonly =
2508 ((zp->z_pflags & ZFS_READONLY) != 0);
2509 XVA_SET_RTN(xvap, XAT_READONLY);
2512 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
2514 ((zp->z_pflags & ZFS_SYSTEM) != 0);
2515 XVA_SET_RTN(xvap, XAT_SYSTEM);
2518 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
2520 ((zp->z_pflags & ZFS_HIDDEN) != 0);
2521 XVA_SET_RTN(xvap, XAT_HIDDEN);
2524 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2525 xoap->xoa_nounlink =
2526 ((zp->z_pflags & ZFS_NOUNLINK) != 0);
2527 XVA_SET_RTN(xvap, XAT_NOUNLINK);
2530 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2531 xoap->xoa_immutable =
2532 ((zp->z_pflags & ZFS_IMMUTABLE) != 0);
2533 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
2536 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2537 xoap->xoa_appendonly =
2538 ((zp->z_pflags & ZFS_APPENDONLY) != 0);
2539 XVA_SET_RTN(xvap, XAT_APPENDONLY);
2542 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2544 ((zp->z_pflags & ZFS_NODUMP) != 0);
2545 XVA_SET_RTN(xvap, XAT_NODUMP);
2548 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
2550 ((zp->z_pflags & ZFS_OPAQUE) != 0);
2551 XVA_SET_RTN(xvap, XAT_OPAQUE);
2554 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2555 xoap->xoa_av_quarantined =
2556 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
2557 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
2560 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2561 xoap->xoa_av_modified =
2562 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
2563 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
2566 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
2567 S_ISREG(ip->i_mode)) {
2568 zfs_sa_get_scanstamp(zp, xvap);
2571 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
2574 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
2575 times, sizeof (times));
2576 ZFS_TIME_DECODE(&xoap->xoa_createtime, times);
2577 XVA_SET_RTN(xvap, XAT_CREATETIME);
2580 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2581 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
2582 XVA_SET_RTN(xvap, XAT_REPARSE);
2584 if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
2585 xoap->xoa_generation = ip->i_generation;
2586 XVA_SET_RTN(xvap, XAT_GEN);
2589 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
2591 ((zp->z_pflags & ZFS_OFFLINE) != 0);
2592 XVA_SET_RTN(xvap, XAT_OFFLINE);
2595 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
2597 ((zp->z_pflags & ZFS_SPARSE) != 0);
2598 XVA_SET_RTN(xvap, XAT_SPARSE);
2601 if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
2602 xoap->xoa_projinherit =
2603 ((zp->z_pflags & ZFS_PROJINHERIT) != 0);
2604 XVA_SET_RTN(xvap, XAT_PROJINHERIT);
2607 if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
2608 xoap->xoa_projid = zp->z_projid;
2609 XVA_SET_RTN(xvap, XAT_PROJID);
2613 ZFS_TIME_DECODE(&vap->va_atime, atime);
2614 ZFS_TIME_DECODE(&vap->va_mtime, mtime);
2615 ZFS_TIME_DECODE(&vap->va_ctime, ctime);
2617 mutex_exit(&zp->z_lock);
2619 sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks);
2621 if (zp->z_blksz == 0) {
2623 * Block size hasn't been set; suggest maximal I/O transfers.
2625 vap->va_blksize = zfsvfs->z_max_blksz;
2633 * Get the basic file attributes and place them in the provided kstat
2634 * structure. The inode is assumed to be the authoritative source
2635 * for most of the attributes. However, the znode currently has the
2636 * authoritative atime, blksize, and block count.
2638 * IN: ip - inode of file.
2640 * OUT: sp - kstat values.
2642 * RETURN: 0 (always succeeds)
2646 zfs_getattr_fast(struct inode *ip, struct kstat *sp)
2648 znode_t *zp = ITOZ(ip);
2649 zfsvfs_t *zfsvfs = ITOZSB(ip);
2651 u_longlong_t nblocks;
2656 mutex_enter(&zp->z_lock);
2658 generic_fillattr(ip, sp);
2660 sa_object_size(zp->z_sa_hdl, &blksize, &nblocks);
2661 sp->blksize = blksize;
2662 sp->blocks = nblocks;
2664 if (unlikely(zp->z_blksz == 0)) {
2666 * Block size hasn't been set; suggest maximal I/O transfers.
2668 sp->blksize = zfsvfs->z_max_blksz;
2671 mutex_exit(&zp->z_lock);
2674 * Required to prevent NFS client from detecting different inode
2675 * numbers of snapshot root dentry before and after snapshot mount.
2677 if (zfsvfs->z_issnap) {
2678 if (ip->i_sb->s_root->d_inode == ip)
2679 sp->ino = ZFSCTL_INO_SNAPDIRS -
2680 dmu_objset_id(zfsvfs->z_os);
2689 * For the operation of changing file's user/group/project, we need to
2690 * handle not only the main object that is assigned to the file directly,
2691 * but also the ones that are used by the file via hidden xattr directory.
2693 * Because the xattr directory may contains many EA entries, as to it may
2694 * be impossible to change all of them via the transaction of changing the
2695 * main object's user/group/project attributes. Then we have to change them
2696 * via other multiple independent transactions one by one. It may be not good
2697 * solution, but we have no better idea yet.
2700 zfs_setattr_dir(znode_t *dzp)
2702 struct inode *dxip = ZTOI(dzp);
2703 struct inode *xip = NULL;
2704 zfsvfs_t *zfsvfs = ITOZSB(dxip);
2705 objset_t *os = zfsvfs->z_os;
2707 zap_attribute_t zap;
2710 dmu_tx_t *tx = NULL;
2712 sa_bulk_attr_t bulk[4];
2716 zap_cursor_init(&zc, os, dzp->z_id);
2717 while ((err = zap_cursor_retrieve(&zc, &zap)) == 0) {
2719 if (zap.za_integer_length != 8 || zap.za_num_integers != 1) {
2724 err = zfs_dirent_lock(&dl, dzp, (char *)zap.za_name, &zp,
2725 ZEXISTS, NULL, NULL);
2732 if (KUID_TO_SUID(xip->i_uid) == KUID_TO_SUID(dxip->i_uid) &&
2733 KGID_TO_SGID(xip->i_gid) == KGID_TO_SGID(dxip->i_gid) &&
2734 zp->z_projid == dzp->z_projid)
2737 tx = dmu_tx_create(os);
2738 if (!(zp->z_pflags & ZFS_PROJID))
2739 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2741 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2743 err = dmu_tx_assign(tx, TXG_WAIT);
2747 mutex_enter(&dzp->z_lock);
2749 if (KUID_TO_SUID(xip->i_uid) != KUID_TO_SUID(dxip->i_uid)) {
2750 xip->i_uid = dxip->i_uid;
2751 uid = zfs_uid_read(dxip);
2752 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
2753 &uid, sizeof (uid));
2756 if (KGID_TO_SGID(xip->i_gid) != KGID_TO_SGID(dxip->i_gid)) {
2757 xip->i_gid = dxip->i_gid;
2758 gid = zfs_gid_read(dxip);
2759 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
2760 &gid, sizeof (gid));
2763 if (zp->z_projid != dzp->z_projid) {
2764 if (!(zp->z_pflags & ZFS_PROJID)) {
2765 zp->z_pflags |= ZFS_PROJID;
2766 SA_ADD_BULK_ATTR(bulk, count,
2767 SA_ZPL_FLAGS(zfsvfs), NULL, &zp->z_pflags,
2768 sizeof (zp->z_pflags));
2771 zp->z_projid = dzp->z_projid;
2772 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PROJID(zfsvfs),
2773 NULL, &zp->z_projid, sizeof (zp->z_projid));
2776 mutex_exit(&dzp->z_lock);
2778 if (likely(count > 0)) {
2779 err = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
2785 if (err != 0 && err != ENOENT)
2792 zfs_dirent_unlock(dl);
2794 zap_cursor_advance(&zc);
2801 zfs_dirent_unlock(dl);
2803 zap_cursor_fini(&zc);
2805 return (err == ENOENT ? 0 : err);
2809 * Set the file attributes to the values contained in the
2812 * IN: ip - inode of file to be modified.
2813 * vap - new attribute values.
2814 * If ATTR_XVATTR set, then optional attrs are being set
2815 * flags - ATTR_UTIME set if non-default time values provided.
2816 * - ATTR_NOACLCHECK (CIFS context only).
2817 * cr - credentials of caller.
2819 * RETURN: 0 if success
2820 * error code if failure
2823 * ip - ctime updated, mtime updated if size changed.
2827 zfs_setattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2829 znode_t *zp = ITOZ(ip);
2830 zfsvfs_t *zfsvfs = ITOZSB(ip);
2831 objset_t *os = zfsvfs->z_os;
2835 xvattr_t *tmpxvattr;
2836 uint_t mask = vap->va_mask;
2837 uint_t saved_mask = 0;
2840 uint64_t new_kuid = 0, new_kgid = 0, new_uid, new_gid;
2842 uint64_t mtime[2], ctime[2], atime[2];
2843 uint64_t projid = ZFS_INVALID_PROJID;
2845 int need_policy = FALSE;
2847 zfs_fuid_info_t *fuidp = NULL;
2848 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2851 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2852 boolean_t fuid_dirtied = B_FALSE;
2853 boolean_t handle_eadir = B_FALSE;
2854 sa_bulk_attr_t *bulk, *xattr_bulk;
2855 int count = 0, xattr_count = 0, bulks = 8;
2864 * If this is a xvattr_t, then get a pointer to the structure of
2865 * optional attributes. If this is NULL, then we have a vattr_t.
2867 xoap = xva_getxoptattr(xvap);
2868 if (xoap != NULL && (mask & ATTR_XVATTR)) {
2869 if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
2870 if (!dmu_objset_projectquota_enabled(os) ||
2871 (!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode))) {
2873 return (SET_ERROR(ENOTSUP));
2876 projid = xoap->xoa_projid;
2877 if (unlikely(projid == ZFS_INVALID_PROJID)) {
2879 return (SET_ERROR(EINVAL));
2882 if (projid == zp->z_projid && zp->z_pflags & ZFS_PROJID)
2883 projid = ZFS_INVALID_PROJID;
2888 if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT) &&
2889 (xoap->xoa_projinherit !=
2890 ((zp->z_pflags & ZFS_PROJINHERIT) != 0)) &&
2891 (!dmu_objset_projectquota_enabled(os) ||
2892 (!S_ISREG(ip->i_mode) && !S_ISDIR(ip->i_mode)))) {
2894 return (SET_ERROR(ENOTSUP));
2898 zilog = zfsvfs->z_log;
2901 * Make sure that if we have ephemeral uid/gid or xvattr specified
2902 * that file system is at proper version level
2905 if (zfsvfs->z_use_fuids == B_FALSE &&
2906 (((mask & ATTR_UID) && IS_EPHEMERAL(vap->va_uid)) ||
2907 ((mask & ATTR_GID) && IS_EPHEMERAL(vap->va_gid)) ||
2908 (mask & ATTR_XVATTR))) {
2910 return (SET_ERROR(EINVAL));
2913 if (mask & ATTR_SIZE && S_ISDIR(ip->i_mode)) {
2915 return (SET_ERROR(EISDIR));
2918 if (mask & ATTR_SIZE && !S_ISREG(ip->i_mode) && !S_ISFIFO(ip->i_mode)) {
2920 return (SET_ERROR(EINVAL));
2923 tmpxvattr = kmem_alloc(sizeof (xvattr_t), KM_SLEEP);
2924 xva_init(tmpxvattr);
2926 bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);
2927 xattr_bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * bulks, KM_SLEEP);
2930 * Immutable files can only alter immutable bit and atime
2932 if ((zp->z_pflags & ZFS_IMMUTABLE) &&
2933 ((mask & (ATTR_SIZE|ATTR_UID|ATTR_GID|ATTR_MTIME|ATTR_MODE)) ||
2934 ((mask & ATTR_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
2935 err = SET_ERROR(EPERM);
2939 if ((mask & ATTR_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
2940 err = SET_ERROR(EPERM);
2945 * Verify timestamps doesn't overflow 32 bits.
2946 * ZFS can handle large timestamps, but 32bit syscalls can't
2947 * handle times greater than 2039. This check should be removed
2948 * once large timestamps are fully supported.
2950 if (mask & (ATTR_ATIME | ATTR_MTIME)) {
2951 if (((mask & ATTR_ATIME) &&
2952 TIMESPEC_OVERFLOW(&vap->va_atime)) ||
2953 ((mask & ATTR_MTIME) &&
2954 TIMESPEC_OVERFLOW(&vap->va_mtime))) {
2955 err = SET_ERROR(EOVERFLOW);
2964 /* Can this be moved to before the top label? */
2965 if (zfs_is_readonly(zfsvfs)) {
2966 err = SET_ERROR(EROFS);
2971 * First validate permissions
2974 if (mask & ATTR_SIZE) {
2975 err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
2980 * XXX - Note, we are not providing any open
2981 * mode flags here (like FNDELAY), so we may
2982 * block if there are locks present... this
2983 * should be addressed in openat().
2985 /* XXX - would it be OK to generate a log record here? */
2986 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
2991 if (mask & (ATTR_ATIME|ATTR_MTIME) ||
2992 ((mask & ATTR_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) ||
2993 XVA_ISSET_REQ(xvap, XAT_READONLY) ||
2994 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) ||
2995 XVA_ISSET_REQ(xvap, XAT_OFFLINE) ||
2996 XVA_ISSET_REQ(xvap, XAT_SPARSE) ||
2997 XVA_ISSET_REQ(xvap, XAT_CREATETIME) ||
2998 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
2999 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
3003 if (mask & (ATTR_UID|ATTR_GID)) {
3004 int idmask = (mask & (ATTR_UID|ATTR_GID));
3009 * NOTE: even if a new mode is being set,
3010 * we may clear S_ISUID/S_ISGID bits.
3013 if (!(mask & ATTR_MODE))
3014 vap->va_mode = zp->z_mode;
3017 * Take ownership or chgrp to group we are a member of
3020 take_owner = (mask & ATTR_UID) && (vap->va_uid == crgetuid(cr));
3021 take_group = (mask & ATTR_GID) &&
3022 zfs_groupmember(zfsvfs, vap->va_gid, cr);
3025 * If both ATTR_UID and ATTR_GID are set then take_owner and
3026 * take_group must both be set in order to allow taking
3029 * Otherwise, send the check through secpolicy_vnode_setattr()
3033 if (((idmask == (ATTR_UID|ATTR_GID)) &&
3034 take_owner && take_group) ||
3035 ((idmask == ATTR_UID) && take_owner) ||
3036 ((idmask == ATTR_GID) && take_group)) {
3037 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
3038 skipaclchk, cr) == 0) {
3040 * Remove setuid/setgid for non-privileged users
3042 (void) secpolicy_setid_clear(vap, cr);
3043 trim_mask = (mask & (ATTR_UID|ATTR_GID));
3052 mutex_enter(&zp->z_lock);
3053 oldva.va_mode = zp->z_mode;
3054 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
3055 if (mask & ATTR_XVATTR) {
3057 * Update xvattr mask to include only those attributes
3058 * that are actually changing.
3060 * the bits will be restored prior to actually setting
3061 * the attributes so the caller thinks they were set.
3063 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
3064 if (xoap->xoa_appendonly !=
3065 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
3068 XVA_CLR_REQ(xvap, XAT_APPENDONLY);
3069 XVA_SET_REQ(tmpxvattr, XAT_APPENDONLY);
3073 if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT)) {
3074 if (xoap->xoa_projinherit !=
3075 ((zp->z_pflags & ZFS_PROJINHERIT) != 0)) {
3078 XVA_CLR_REQ(xvap, XAT_PROJINHERIT);
3079 XVA_SET_REQ(tmpxvattr, XAT_PROJINHERIT);
3083 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
3084 if (xoap->xoa_nounlink !=
3085 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
3088 XVA_CLR_REQ(xvap, XAT_NOUNLINK);
3089 XVA_SET_REQ(tmpxvattr, XAT_NOUNLINK);
3093 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
3094 if (xoap->xoa_immutable !=
3095 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
3098 XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
3099 XVA_SET_REQ(tmpxvattr, XAT_IMMUTABLE);
3103 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
3104 if (xoap->xoa_nodump !=
3105 ((zp->z_pflags & ZFS_NODUMP) != 0)) {
3108 XVA_CLR_REQ(xvap, XAT_NODUMP);
3109 XVA_SET_REQ(tmpxvattr, XAT_NODUMP);
3113 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
3114 if (xoap->xoa_av_modified !=
3115 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
3118 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
3119 XVA_SET_REQ(tmpxvattr, XAT_AV_MODIFIED);
3123 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
3124 if ((!S_ISREG(ip->i_mode) &&
3125 xoap->xoa_av_quarantined) ||
3126 xoap->xoa_av_quarantined !=
3127 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
3130 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
3131 XVA_SET_REQ(tmpxvattr, XAT_AV_QUARANTINED);
3135 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
3136 mutex_exit(&zp->z_lock);
3137 err = SET_ERROR(EPERM);
3141 if (need_policy == FALSE &&
3142 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) ||
3143 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
3148 mutex_exit(&zp->z_lock);
3150 if (mask & ATTR_MODE) {
3151 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
3152 err = secpolicy_setid_setsticky_clear(ip, vap,
3157 trim_mask |= ATTR_MODE;
3165 * If trim_mask is set then take ownership
3166 * has been granted or write_acl is present and user
3167 * has the ability to modify mode. In that case remove
3168 * UID|GID and or MODE from mask so that
3169 * secpolicy_vnode_setattr() doesn't revoke it.
3173 saved_mask = vap->va_mask;
3174 vap->va_mask &= ~trim_mask;
3176 err = secpolicy_vnode_setattr(cr, ip, vap, &oldva, flags,
3177 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
3182 vap->va_mask |= saved_mask;
3186 * secpolicy_vnode_setattr, or take ownership may have
3189 mask = vap->va_mask;
3191 if ((mask & (ATTR_UID | ATTR_GID)) || projid != ZFS_INVALID_PROJID) {
3192 handle_eadir = B_TRUE;
3193 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
3194 &xattr_obj, sizeof (xattr_obj));
3196 if (err == 0 && xattr_obj) {
3197 err = zfs_zget(ZTOZSB(zp), xattr_obj, &attrzp);
3201 if (mask & ATTR_UID) {
3202 new_kuid = zfs_fuid_create(zfsvfs,
3203 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
3204 if (new_kuid != KUID_TO_SUID(ZTOI(zp)->i_uid) &&
3205 zfs_id_overquota(zfsvfs, DMU_USERUSED_OBJECT,
3209 err = SET_ERROR(EDQUOT);
3214 if (mask & ATTR_GID) {
3215 new_kgid = zfs_fuid_create(zfsvfs,
3216 (uint64_t)vap->va_gid, cr, ZFS_GROUP, &fuidp);
3217 if (new_kgid != KGID_TO_SGID(ZTOI(zp)->i_gid) &&
3218 zfs_id_overquota(zfsvfs, DMU_GROUPUSED_OBJECT,
3222 err = SET_ERROR(EDQUOT);
3227 if (projid != ZFS_INVALID_PROJID &&
3228 zfs_id_overquota(zfsvfs, DMU_PROJECTUSED_OBJECT, projid)) {
3235 tx = dmu_tx_create(os);
3237 if (mask & ATTR_MODE) {
3238 uint64_t pmode = zp->z_mode;
3240 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
3242 zfs_acl_chmod_setattr(zp, &aclp, new_mode);
3244 mutex_enter(&zp->z_lock);
3245 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
3247 * Are we upgrading ACL from old V0 format
3250 if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
3251 zfs_znode_acl_version(zp) ==
3252 ZFS_ACL_VERSION_INITIAL) {
3253 dmu_tx_hold_free(tx, acl_obj, 0,
3255 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3256 0, aclp->z_acl_bytes);
3258 dmu_tx_hold_write(tx, acl_obj, 0,
3261 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3262 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3263 0, aclp->z_acl_bytes);
3265 mutex_exit(&zp->z_lock);
3266 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3268 if (((mask & ATTR_XVATTR) &&
3269 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) ||
3270 (projid != ZFS_INVALID_PROJID &&
3271 !(zp->z_pflags & ZFS_PROJID)))
3272 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3274 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
3278 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
3281 fuid_dirtied = zfsvfs->z_fuid_dirty;
3283 zfs_fuid_txhold(zfsvfs, tx);
3285 zfs_sa_upgrade_txholds(tx, zp);
3287 err = dmu_tx_assign(tx, TXG_WAIT);
3293 * Set each attribute requested.
3294 * We group settings according to the locks they need to acquire.
3296 * Note: you cannot set ctime directly, although it will be
3297 * updated as a side-effect of calling this function.
3300 if (projid != ZFS_INVALID_PROJID && !(zp->z_pflags & ZFS_PROJID)) {
3302 * For the existed object that is upgraded from old system,
3303 * its on-disk layout has no slot for the project ID attribute.
3304 * But quota accounting logic needs to access related slots by
3305 * offset directly. So we need to adjust old objects' layout
3306 * to make the project ID to some unified and fixed offset.
3309 err = sa_add_projid(attrzp->z_sa_hdl, tx, projid);
3311 err = sa_add_projid(zp->z_sa_hdl, tx, projid);
3313 if (unlikely(err == EEXIST))
3318 projid = ZFS_INVALID_PROJID;
3321 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3322 mutex_enter(&zp->z_acl_lock);
3323 mutex_enter(&zp->z_lock);
3325 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
3326 &zp->z_pflags, sizeof (zp->z_pflags));
3329 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3330 mutex_enter(&attrzp->z_acl_lock);
3331 mutex_enter(&attrzp->z_lock);
3332 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3333 SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags,
3334 sizeof (attrzp->z_pflags));
3335 if (projid != ZFS_INVALID_PROJID) {
3336 attrzp->z_projid = projid;
3337 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3338 SA_ZPL_PROJID(zfsvfs), NULL, &attrzp->z_projid,
3339 sizeof (attrzp->z_projid));
3343 if (mask & (ATTR_UID|ATTR_GID)) {
3345 if (mask & ATTR_UID) {
3346 ZTOI(zp)->i_uid = SUID_TO_KUID(new_kuid);
3347 new_uid = zfs_uid_read(ZTOI(zp));
3348 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
3349 &new_uid, sizeof (new_uid));
3351 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3352 SA_ZPL_UID(zfsvfs), NULL, &new_uid,
3354 ZTOI(attrzp)->i_uid = SUID_TO_KUID(new_uid);
3358 if (mask & ATTR_GID) {
3359 ZTOI(zp)->i_gid = SGID_TO_KGID(new_kgid);
3360 new_gid = zfs_gid_read(ZTOI(zp));
3361 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
3362 NULL, &new_gid, sizeof (new_gid));
3364 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3365 SA_ZPL_GID(zfsvfs), NULL, &new_gid,
3367 ZTOI(attrzp)->i_gid = SGID_TO_KGID(new_kgid);
3370 if (!(mask & ATTR_MODE)) {
3371 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs),
3372 NULL, &new_mode, sizeof (new_mode));
3373 new_mode = zp->z_mode;
3375 err = zfs_acl_chown_setattr(zp);
3378 err = zfs_acl_chown_setattr(attrzp);
3383 if (mask & ATTR_MODE) {
3384 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
3385 &new_mode, sizeof (new_mode));
3386 zp->z_mode = ZTOI(zp)->i_mode = new_mode;
3387 ASSERT3P(aclp, !=, NULL);
3388 err = zfs_aclset_common(zp, aclp, cr, tx);
3390 if (zp->z_acl_cached)
3391 zfs_acl_free(zp->z_acl_cached);
3392 zp->z_acl_cached = aclp;
3396 if ((mask & ATTR_ATIME) || zp->z_atime_dirty) {
3397 zp->z_atime_dirty = 0;
3398 ZFS_TIME_ENCODE(&ip->i_atime, atime);
3399 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
3400 &atime, sizeof (atime));
3403 if (mask & (ATTR_MTIME | ATTR_SIZE)) {
3404 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
3405 ZTOI(zp)->i_mtime = zpl_inode_timespec_trunc(vap->va_mtime,
3406 ZTOI(zp)->i_sb->s_time_gran);
3408 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
3409 mtime, sizeof (mtime));
3412 if (mask & (ATTR_CTIME | ATTR_SIZE)) {
3413 ZFS_TIME_ENCODE(&vap->va_ctime, ctime);
3414 ZTOI(zp)->i_ctime = zpl_inode_timespec_trunc(vap->va_ctime,
3415 ZTOI(zp)->i_sb->s_time_gran);
3416 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
3417 ctime, sizeof (ctime));
3420 if (projid != ZFS_INVALID_PROJID) {
3421 zp->z_projid = projid;
3422 SA_ADD_BULK_ATTR(bulk, count,
3423 SA_ZPL_PROJID(zfsvfs), NULL, &zp->z_projid,
3424 sizeof (zp->z_projid));
3427 if (attrzp && mask) {
3428 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3429 SA_ZPL_CTIME(zfsvfs), NULL, &ctime,
3434 * Do this after setting timestamps to prevent timestamp
3435 * update from toggling bit
3438 if (xoap && (mask & ATTR_XVATTR)) {
3441 * restore trimmed off masks
3442 * so that return masks can be set for caller.
3445 if (XVA_ISSET_REQ(tmpxvattr, XAT_APPENDONLY)) {
3446 XVA_SET_REQ(xvap, XAT_APPENDONLY);
3448 if (XVA_ISSET_REQ(tmpxvattr, XAT_NOUNLINK)) {
3449 XVA_SET_REQ(xvap, XAT_NOUNLINK);
3451 if (XVA_ISSET_REQ(tmpxvattr, XAT_IMMUTABLE)) {
3452 XVA_SET_REQ(xvap, XAT_IMMUTABLE);
3454 if (XVA_ISSET_REQ(tmpxvattr, XAT_NODUMP)) {
3455 XVA_SET_REQ(xvap, XAT_NODUMP);
3457 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_MODIFIED)) {
3458 XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
3460 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_QUARANTINED)) {
3461 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
3463 if (XVA_ISSET_REQ(tmpxvattr, XAT_PROJINHERIT)) {
3464 XVA_SET_REQ(xvap, XAT_PROJINHERIT);
3467 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3468 ASSERT(S_ISREG(ip->i_mode));
3470 zfs_xvattr_set(zp, xvap, tx);
3474 zfs_fuid_sync(zfsvfs, tx);
3477 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);
3479 mutex_exit(&zp->z_lock);
3480 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3481 mutex_exit(&zp->z_acl_lock);
3484 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3485 mutex_exit(&attrzp->z_acl_lock);
3486 mutex_exit(&attrzp->z_lock);
3489 if (err == 0 && xattr_count > 0) {
3490 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
3499 zfs_fuid_info_free(fuidp);
3507 if (err == ERESTART)
3511 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
3514 if (err2 == 0 && handle_eadir)
3515 err2 = zfs_setattr_dir(attrzp);
3518 zfs_inode_update(zp);
3522 if (os->os_sync == ZFS_SYNC_ALWAYS)
3523 zil_commit(zilog, 0);
3526 kmem_free(xattr_bulk, sizeof (sa_bulk_attr_t) * bulks);
3527 kmem_free(bulk, sizeof (sa_bulk_attr_t) * bulks);
3528 kmem_free(tmpxvattr, sizeof (xvattr_t));
3533 typedef struct zfs_zlock {
3534 krwlock_t *zl_rwlock; /* lock we acquired */
3535 znode_t *zl_znode; /* znode we held */
3536 struct zfs_zlock *zl_next; /* next in list */
3540 * Drop locks and release vnodes that were held by zfs_rename_lock().
3543 zfs_rename_unlock(zfs_zlock_t **zlpp)
3547 while ((zl = *zlpp) != NULL) {
3548 if (zl->zl_znode != NULL)
3549 zfs_iput_async(ZTOI(zl->zl_znode));
3550 rw_exit(zl->zl_rwlock);
3551 *zlpp = zl->zl_next;
3552 kmem_free(zl, sizeof (*zl));
3557 * Search back through the directory tree, using the ".." entries.
3558 * Lock each directory in the chain to prevent concurrent renames.
3559 * Fail any attempt to move a directory into one of its own descendants.
3560 * XXX - z_parent_lock can overlap with map or grow locks
3563 zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp)
3567 uint64_t rootid = ZTOZSB(zp)->z_root;
3568 uint64_t oidp = zp->z_id;
3569 krwlock_t *rwlp = &szp->z_parent_lock;
3570 krw_t rw = RW_WRITER;
3573 * First pass write-locks szp and compares to zp->z_id.
3574 * Later passes read-lock zp and compare to zp->z_parent.
3577 if (!rw_tryenter(rwlp, rw)) {
3579 * Another thread is renaming in this path.
3580 * Note that if we are a WRITER, we don't have any
3581 * parent_locks held yet.
3583 if (rw == RW_READER && zp->z_id > szp->z_id) {
3585 * Drop our locks and restart
3587 zfs_rename_unlock(&zl);
3591 rwlp = &szp->z_parent_lock;
3596 * Wait for other thread to drop its locks
3602 zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
3603 zl->zl_rwlock = rwlp;
3604 zl->zl_znode = NULL;
3605 zl->zl_next = *zlpp;
3608 if (oidp == szp->z_id) /* We're a descendant of szp */
3609 return (SET_ERROR(EINVAL));
3611 if (oidp == rootid) /* We've hit the top */
3614 if (rw == RW_READER) { /* i.e. not the first pass */
3615 int error = zfs_zget(ZTOZSB(zp), oidp, &zp);
3620 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(ZTOZSB(zp)),
3621 &oidp, sizeof (oidp));
3622 rwlp = &zp->z_parent_lock;
3625 } while (zp->z_id != sdzp->z_id);
3631 * Move an entry from the provided source directory to the target
3632 * directory. Change the entry name as indicated.
3634 * IN: sdip - Source directory containing the "old entry".
3635 * snm - Old entry name.
3636 * tdip - Target directory to contain the "new entry".
3637 * tnm - New entry name.
3638 * cr - credentials of caller.
3639 * flags - case flags
3641 * RETURN: 0 on success, error code on failure.
3644 * sdip,tdip - ctime|mtime updated
3648 zfs_rename(struct inode *sdip, char *snm, struct inode *tdip, char *tnm,
3649 cred_t *cr, int flags)
3651 znode_t *tdzp, *szp, *tzp;
3652 znode_t *sdzp = ITOZ(sdip);
3653 zfsvfs_t *zfsvfs = ITOZSB(sdip);
3655 zfs_dirlock_t *sdl, *tdl;
3658 int cmp, serr, terr;
3661 boolean_t waited = B_FALSE;
3663 if (snm == NULL || tnm == NULL)
3664 return (SET_ERROR(EINVAL));
3667 ZFS_VERIFY_ZP(sdzp);
3668 zilog = zfsvfs->z_log;
3671 ZFS_VERIFY_ZP(tdzp);
3674 * We check i_sb because snapshots and the ctldir must have different
3677 if (tdip->i_sb != sdip->i_sb || zfsctl_is_node(tdip)) {
3679 return (SET_ERROR(EXDEV));
3682 if (zfsvfs->z_utf8 && u8_validate(tnm,
3683 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3685 return (SET_ERROR(EILSEQ));
3688 if (flags & FIGNORECASE)
3697 * This is to prevent the creation of links into attribute space
3698 * by renaming a linked file into/outof an attribute directory.
3699 * See the comment in zfs_link() for why this is considered bad.
3701 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
3703 return (SET_ERROR(EINVAL));
3707 * Lock source and target directory entries. To prevent deadlock,
3708 * a lock ordering must be defined. We lock the directory with
3709 * the smallest object id first, or if it's a tie, the one with
3710 * the lexically first name.
3712 if (sdzp->z_id < tdzp->z_id) {
3714 } else if (sdzp->z_id > tdzp->z_id) {
3718 * First compare the two name arguments without
3719 * considering any case folding.
3721 int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER);
3723 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
3724 ASSERT(error == 0 || !zfsvfs->z_utf8);
3727 * POSIX: "If the old argument and the new argument
3728 * both refer to links to the same existing file,
3729 * the rename() function shall return successfully
3730 * and perform no other action."
3736 * If the file system is case-folding, then we may
3737 * have some more checking to do. A case-folding file
3738 * system is either supporting mixed case sensitivity
3739 * access or is completely case-insensitive. Note
3740 * that the file system is always case preserving.
3742 * In mixed sensitivity mode case sensitive behavior
3743 * is the default. FIGNORECASE must be used to
3744 * explicitly request case insensitive behavior.
3746 * If the source and target names provided differ only
3747 * by case (e.g., a request to rename 'tim' to 'Tim'),
3748 * we will treat this as a special case in the
3749 * case-insensitive mode: as long as the source name
3750 * is an exact match, we will allow this to proceed as
3751 * a name-change request.
3753 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
3754 (zfsvfs->z_case == ZFS_CASE_MIXED &&
3755 flags & FIGNORECASE)) &&
3756 u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST,
3759 * case preserving rename request, require exact
3768 * If the source and destination directories are the same, we should
3769 * grab the z_name_lock of that directory only once.
3773 rw_enter(&sdzp->z_name_lock, RW_READER);
3777 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
3778 ZEXISTS | zflg, NULL, NULL);
3779 terr = zfs_dirent_lock(&tdl,
3780 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL);
3782 terr = zfs_dirent_lock(&tdl,
3783 tdzp, tnm, &tzp, zflg, NULL, NULL);
3784 serr = zfs_dirent_lock(&sdl,
3785 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg,
3791 * Source entry invalid or not there.
3794 zfs_dirent_unlock(tdl);
3800 rw_exit(&sdzp->z_name_lock);
3802 if (strcmp(snm, "..") == 0)
3808 zfs_dirent_unlock(sdl);
3812 rw_exit(&sdzp->z_name_lock);
3814 if (strcmp(tnm, "..") == 0)
3821 * If we are using project inheritance, means if the directory has
3822 * ZFS_PROJINHERIT set, then its descendant directories will inherit
3823 * not only the project ID, but also the ZFS_PROJINHERIT flag. Under
3824 * such case, we only allow renames into our tree when the project
3827 if (tdzp->z_pflags & ZFS_PROJINHERIT &&
3828 tdzp->z_projid != szp->z_projid) {
3829 error = SET_ERROR(EXDEV);
3834 * Must have write access at the source to remove the old entry
3835 * and write access at the target to create the new entry.
3836 * Note that if target and source are the same, this can be
3837 * done in a single check.
3840 if ((error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)))
3843 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3845 * Check to make sure rename is valid.
3846 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3848 if ((error = zfs_rename_lock(szp, tdzp, sdzp, &zl)))
3853 * Does target exist?
3857 * Source and target must be the same type.
3859 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3860 if (!S_ISDIR(ZTOI(tzp)->i_mode)) {
3861 error = SET_ERROR(ENOTDIR);
3865 if (S_ISDIR(ZTOI(tzp)->i_mode)) {
3866 error = SET_ERROR(EISDIR);
3871 * POSIX dictates that when the source and target
3872 * entries refer to the same file object, rename
3873 * must do nothing and exit without error.
3875 if (szp->z_id == tzp->z_id) {
3881 tx = dmu_tx_create(zfsvfs->z_os);
3882 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3883 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
3884 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
3885 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
3887 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
3888 zfs_sa_upgrade_txholds(tx, tdzp);
3891 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
3892 zfs_sa_upgrade_txholds(tx, tzp);
3895 zfs_sa_upgrade_txholds(tx, szp);
3896 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
3897 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
3900 zfs_rename_unlock(&zl);
3901 zfs_dirent_unlock(sdl);
3902 zfs_dirent_unlock(tdl);
3905 rw_exit(&sdzp->z_name_lock);
3907 if (error == ERESTART) {
3924 if (tzp) /* Attempt to remove the existing target */
3925 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
3928 error = zfs_link_create(tdl, szp, tx, ZRENAMING);
3930 szp->z_pflags |= ZFS_AV_MODIFIED;
3931 if (tdzp->z_pflags & ZFS_PROJINHERIT)
3932 szp->z_pflags |= ZFS_PROJINHERIT;
3934 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
3935 (void *)&szp->z_pflags, sizeof (uint64_t), tx);
3938 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
3940 zfs_log_rename(zilog, tx, TX_RENAME |
3941 (flags & FIGNORECASE ? TX_CI : 0), sdzp,
3942 sdl->dl_name, tdzp, tdl->dl_name, szp);
3945 * At this point, we have successfully created
3946 * the target name, but have failed to remove
3947 * the source name. Since the create was done
3948 * with the ZRENAMING flag, there are
3949 * complications; for one, the link count is
3950 * wrong. The easiest way to deal with this
3951 * is to remove the newly created target, and
3952 * return the original error. This must
3953 * succeed; fortunately, it is very unlikely to
3954 * fail, since we just created it.
3956 VERIFY3U(zfs_link_destroy(tdl, szp, tx,
3957 ZRENAMING, NULL), ==, 0);
3961 * If we had removed the existing target, subsequent
3962 * call to zfs_link_create() to add back the same entry
3963 * but, the new dnode (szp) should not fail.
3965 ASSERT(tzp == NULL);
3972 zfs_rename_unlock(&zl);
3974 zfs_dirent_unlock(sdl);
3975 zfs_dirent_unlock(tdl);
3977 zfs_inode_update(sdzp);
3979 rw_exit(&sdzp->z_name_lock);
3982 zfs_inode_update(tdzp);
3984 zfs_inode_update(szp);
3987 zfs_inode_update(tzp);
3991 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3992 zil_commit(zilog, 0);
3999 * Insert the indicated symbolic reference entry into the directory.
4001 * IN: dip - Directory to contain new symbolic link.
4002 * link - Name for new symlink entry.
4003 * vap - Attributes of new entry.
4004 * target - Target path of new symlink.
4006 * cr - credentials of caller.
4007 * flags - case flags
4009 * RETURN: 0 on success, error code on failure.
4012 * dip - ctime|mtime updated
4016 zfs_symlink(struct inode *dip, char *name, vattr_t *vap, char *link,
4017 struct inode **ipp, cred_t *cr, int flags)
4019 znode_t *zp, *dzp = ITOZ(dip);
4022 zfsvfs_t *zfsvfs = ITOZSB(dip);
4024 uint64_t len = strlen(link);
4027 zfs_acl_ids_t acl_ids;
4028 boolean_t fuid_dirtied;
4029 uint64_t txtype = TX_SYMLINK;
4030 boolean_t waited = B_FALSE;
4032 ASSERT(S_ISLNK(vap->va_mode));
4035 return (SET_ERROR(EINVAL));
4039 zilog = zfsvfs->z_log;
4041 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
4042 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
4044 return (SET_ERROR(EILSEQ));
4046 if (flags & FIGNORECASE)
4049 if (len > MAXPATHLEN) {
4051 return (SET_ERROR(ENAMETOOLONG));
4054 if ((error = zfs_acl_ids_create(dzp, 0,
4055 vap, cr, NULL, &acl_ids)) != 0) {
4063 * Attempt to lock directory; fail if entry already exists.
4065 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
4067 zfs_acl_ids_free(&acl_ids);
4072 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
4073 zfs_acl_ids_free(&acl_ids);
4074 zfs_dirent_unlock(dl);
4079 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, ZFS_DEFAULT_PROJID)) {
4080 zfs_acl_ids_free(&acl_ids);
4081 zfs_dirent_unlock(dl);
4083 return (SET_ERROR(EDQUOT));
4085 tx = dmu_tx_create(zfsvfs->z_os);
4086 fuid_dirtied = zfsvfs->z_fuid_dirty;
4087 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
4088 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
4089 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
4090 ZFS_SA_BASE_ATTR_SIZE + len);
4091 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
4092 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
4093 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
4094 acl_ids.z_aclp->z_acl_bytes);
4097 zfs_fuid_txhold(zfsvfs, tx);
4098 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
4100 zfs_dirent_unlock(dl);
4101 if (error == ERESTART) {
4107 zfs_acl_ids_free(&acl_ids);
4114 * Create a new object for the symlink.
4115 * for version 4 ZPL datsets the symlink will be an SA attribute
4117 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
4120 zfs_fuid_sync(zfsvfs, tx);
4122 mutex_enter(&zp->z_lock);
4124 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs),
4127 zfs_sa_symlink(zp, link, len, tx);
4128 mutex_exit(&zp->z_lock);
4131 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
4132 &zp->z_size, sizeof (zp->z_size), tx);
4134 * Insert the new object into the directory.
4136 error = zfs_link_create(dl, zp, tx, ZNEW);
4138 zfs_znode_delete(zp, tx);
4139 remove_inode_hash(ZTOI(zp));
4141 if (flags & FIGNORECASE)
4143 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
4145 zfs_inode_update(dzp);
4146 zfs_inode_update(zp);
4149 zfs_acl_ids_free(&acl_ids);
4153 zfs_dirent_unlock(dl);
4158 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4159 zil_commit(zilog, 0);
4169 * Return, in the buffer contained in the provided uio structure,
4170 * the symbolic path referred to by ip.
4172 * IN: ip - inode of symbolic link
4173 * uio - structure to contain the link path.
4174 * cr - credentials of caller.
4176 * RETURN: 0 if success
4177 * error code if failure
4180 * ip - atime updated
4184 zfs_readlink(struct inode *ip, uio_t *uio, cred_t *cr)
4186 znode_t *zp = ITOZ(ip);
4187 zfsvfs_t *zfsvfs = ITOZSB(ip);
4193 mutex_enter(&zp->z_lock);
4195 error = sa_lookup_uio(zp->z_sa_hdl,
4196 SA_ZPL_SYMLINK(zfsvfs), uio);
4198 error = zfs_sa_readlink(zp, uio);
4199 mutex_exit(&zp->z_lock);
4206 * Insert a new entry into directory tdip referencing sip.
4208 * IN: tdip - Directory to contain new entry.
4209 * sip - inode of new entry.
4210 * name - name of new entry.
4211 * cr - credentials of caller.
4213 * RETURN: 0 if success
4214 * error code if failure
4217 * tdip - ctime|mtime updated
4218 * sip - ctime updated
4222 zfs_link(struct inode *tdip, struct inode *sip, char *name, cred_t *cr,
4225 znode_t *dzp = ITOZ(tdip);
4227 zfsvfs_t *zfsvfs = ITOZSB(tdip);
4235 boolean_t waited = B_FALSE;
4236 boolean_t is_tmpfile = 0;
4239 is_tmpfile = (sip->i_nlink == 0 && (sip->i_state & I_LINKABLE));
4241 ASSERT(S_ISDIR(tdip->i_mode));
4244 return (SET_ERROR(EINVAL));
4248 zilog = zfsvfs->z_log;
4251 * POSIX dictates that we return EPERM here.
4252 * Better choices include ENOTSUP or EISDIR.
4254 if (S_ISDIR(sip->i_mode)) {
4256 return (SET_ERROR(EPERM));
4263 * If we are using project inheritance, means if the directory has
4264 * ZFS_PROJINHERIT set, then its descendant directories will inherit
4265 * not only the project ID, but also the ZFS_PROJINHERIT flag. Under
4266 * such case, we only allow hard link creation in our tree when the
4267 * project IDs are the same.
4269 if (dzp->z_pflags & ZFS_PROJINHERIT && dzp->z_projid != szp->z_projid) {
4271 return (SET_ERROR(EXDEV));
4275 * We check i_sb because snapshots and the ctldir must have different
4278 if (sip->i_sb != tdip->i_sb || zfsctl_is_node(sip)) {
4280 return (SET_ERROR(EXDEV));
4283 /* Prevent links to .zfs/shares files */
4285 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
4286 &parent, sizeof (uint64_t))) != 0) {
4290 if (parent == zfsvfs->z_shares_dir) {
4292 return (SET_ERROR(EPERM));
4295 if (zfsvfs->z_utf8 && u8_validate(name,
4296 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
4298 return (SET_ERROR(EILSEQ));
4300 if (flags & FIGNORECASE)
4304 * We do not support links between attributes and non-attributes
4305 * because of the potential security risk of creating links
4306 * into "normal" file space in order to circumvent restrictions
4307 * imposed in attribute space.
4309 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) {
4311 return (SET_ERROR(EINVAL));
4314 owner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(sip->i_uid),
4316 if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
4318 return (SET_ERROR(EPERM));
4321 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
4328 * Attempt to lock directory; fail if entry already exists.
4330 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL);
4336 tx = dmu_tx_create(zfsvfs->z_os);
4337 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
4338 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
4340 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
4342 zfs_sa_upgrade_txholds(tx, szp);
4343 zfs_sa_upgrade_txholds(tx, dzp);
4344 error = dmu_tx_assign(tx, (waited ? TXG_NOTHROTTLE : 0) | TXG_NOWAIT);
4346 zfs_dirent_unlock(dl);
4347 if (error == ERESTART) {
4357 /* unmark z_unlinked so zfs_link_create will not reject */
4359 szp->z_unlinked = 0;
4360 error = zfs_link_create(dl, szp, tx, 0);
4363 uint64_t txtype = TX_LINK;
4365 * tmpfile is created to be in z_unlinkedobj, so remove it.
4366 * Also, we don't log in ZIL, be cause all previous file
4367 * operation on the tmpfile are ignored by ZIL. Instead we
4368 * always wait for txg to sync to make sure all previous
4369 * operation are sync safe.
4372 VERIFY(zap_remove_int(zfsvfs->z_os,
4373 zfsvfs->z_unlinkedobj, szp->z_id, tx) == 0);
4375 if (flags & FIGNORECASE)
4377 zfs_log_link(zilog, tx, txtype, dzp, szp, name);
4379 } else if (is_tmpfile) {
4380 /* restore z_unlinked since when linking failed */
4381 szp->z_unlinked = 1;
4383 txg = dmu_tx_get_txg(tx);
4386 zfs_dirent_unlock(dl);
4388 if (!is_tmpfile && zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4389 zil_commit(zilog, 0);
4392 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), txg);
4394 zfs_inode_update(dzp);
4395 zfs_inode_update(szp);
4401 zfs_putpage_commit_cb(void *arg)
4403 struct page *pp = arg;
4406 end_page_writeback(pp);
4410 * Push a page out to disk, once the page is on stable storage the
4411 * registered commit callback will be run as notification of completion.
4413 * IN: ip - page mapped for inode.
4414 * pp - page to push (page is locked)
4415 * wbc - writeback control data
4417 * RETURN: 0 if success
4418 * error code if failure
4421 * ip - ctime|mtime updated
4425 zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc)
4427 znode_t *zp = ITOZ(ip);
4428 zfsvfs_t *zfsvfs = ITOZSB(ip);
4435 uint64_t mtime[2], ctime[2];
4436 sa_bulk_attr_t bulk[3];
4438 struct address_space *mapping;
4443 ASSERT(PageLocked(pp));
4445 pgoff = page_offset(pp); /* Page byte-offset in file */
4446 offset = i_size_read(ip); /* File length in bytes */
4447 pglen = MIN(PAGE_SIZE, /* Page length in bytes */
4448 P2ROUNDUP(offset, PAGE_SIZE)-pgoff);
4450 /* Page is beyond end of file */
4451 if (pgoff >= offset) {
4457 /* Truncate page length to end of file */
4458 if (pgoff + pglen > offset)
4459 pglen = offset - pgoff;
4463 * FIXME: Allow mmap writes past its quota. The correct fix
4464 * is to register a page_mkwrite() handler to count the page
4465 * against its quota when it is about to be dirtied.
4467 if (zfs_id_overblockquota(zfsvfs, DMU_USERUSED_OBJECT,
4468 KUID_TO_SUID(ip->i_uid)) ||
4469 zfs_id_overblockquota(zfsvfs, DMU_GROUPUSED_OBJECT,
4470 KGID_TO_SGID(ip->i_gid)) ||
4471 (zp->z_projid != ZFS_DEFAULT_PROJID &&
4472 zfs_id_overblockquota(zfsvfs, DMU_PROJECTUSED_OBJECT,
4479 * The ordering here is critical and must adhere to the following
4480 * rules in order to avoid deadlocking in either zfs_read() or
4481 * zfs_free_range() due to a lock inversion.
4483 * 1) The page must be unlocked prior to acquiring the range lock.
4484 * This is critical because zfs_read() calls find_lock_page()
4485 * which may block on the page lock while holding the range lock.
4487 * 2) Before setting or clearing write back on a page the range lock
4488 * must be held in order to prevent a lock inversion with the
4489 * zfs_free_range() function.
4491 * This presents a problem because upon entering this function the
4492 * page lock is already held. To safely acquire the range lock the
4493 * page lock must be dropped. This creates a window where another
4494 * process could truncate, invalidate, dirty, or write out the page.
4496 * Therefore, after successfully reacquiring the range and page locks
4497 * the current page state is checked. In the common case everything
4498 * will be as is expected and it can be written out. However, if
4499 * the page state has changed it must be handled accordingly.
4501 mapping = pp->mapping;
4502 redirty_page_for_writepage(wbc, pp);
4505 locked_range_t *lr = rangelock_enter(&zp->z_rangelock,
4506 pgoff, pglen, RL_WRITER);
4509 /* Page mapping changed or it was no longer dirty, we're done */
4510 if (unlikely((mapping != pp->mapping) || !PageDirty(pp))) {
4517 /* Another process started write block if required */
4518 if (PageWriteback(pp)) {
4522 if (wbc->sync_mode != WB_SYNC_NONE)
4523 wait_on_page_writeback(pp);
4529 /* Clear the dirty flag the required locks are held */
4530 if (!clear_page_dirty_for_io(pp)) {
4538 * Counterpart for redirty_page_for_writepage() above. This page
4539 * was in fact not skipped and should not be counted as if it were.
4541 wbc->pages_skipped--;
4542 set_page_writeback(pp);
4545 tx = dmu_tx_create(zfsvfs->z_os);
4546 dmu_tx_hold_write(tx, zp->z_id, pgoff, pglen);
4547 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4548 zfs_sa_upgrade_txholds(tx, zp);
4550 err = dmu_tx_assign(tx, TXG_NOWAIT);
4552 if (err == ERESTART)
4556 __set_page_dirty_nobuffers(pp);
4558 end_page_writeback(pp);
4565 ASSERT3U(pglen, <=, PAGE_SIZE);
4566 dmu_write(zfsvfs->z_os, zp->z_id, pgoff, pglen, va, tx);
4569 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
4570 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
4571 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_FLAGS(zfsvfs), NULL,
4574 /* Preserve the mtime and ctime provided by the inode */
4575 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4576 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4577 zp->z_atime_dirty = 0;
4580 err = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4582 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, pgoff, pglen, 0,
4583 zfs_putpage_commit_cb, pp);
4588 if (wbc->sync_mode != WB_SYNC_NONE) {
4590 * Note that this is rarely called under writepages(), because
4591 * writepages() normally handles the entire commit for
4592 * performance reasons.
4594 zil_commit(zfsvfs->z_log, zp->z_id);
4602 * Update the system attributes when the inode has been dirtied. For the
4603 * moment we only update the mode, atime, mtime, and ctime.
4606 zfs_dirty_inode(struct inode *ip, int flags)
4608 znode_t *zp = ITOZ(ip);
4609 zfsvfs_t *zfsvfs = ITOZSB(ip);
4611 uint64_t mode, atime[2], mtime[2], ctime[2];
4612 sa_bulk_attr_t bulk[4];
4616 if (zfs_is_readonly(zfsvfs) || dmu_objset_is_snapshot(zfsvfs->z_os))
4624 * This is the lazytime semantic indroduced in Linux 4.0
4625 * This flag will only be called from update_time when lazytime is set.
4626 * (Note, I_DIRTY_SYNC will also set if not lazytime)
4627 * Fortunately mtime and ctime are managed within ZFS itself, so we
4628 * only need to dirty atime.
4630 if (flags == I_DIRTY_TIME) {
4631 zp->z_atime_dirty = 1;
4636 tx = dmu_tx_create(zfsvfs->z_os);
4638 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4639 zfs_sa_upgrade_txholds(tx, zp);
4641 error = dmu_tx_assign(tx, TXG_WAIT);
4647 mutex_enter(&zp->z_lock);
4648 zp->z_atime_dirty = 0;
4650 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
4651 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_ATIME(zfsvfs), NULL, &atime, 16);
4652 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
4653 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
4655 /* Preserve the mode, mtime and ctime provided by the inode */
4656 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4657 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4658 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4663 error = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4664 mutex_exit(&zp->z_lock);
4674 zfs_inactive(struct inode *ip)
4676 znode_t *zp = ITOZ(ip);
4677 zfsvfs_t *zfsvfs = ITOZSB(ip);
4680 int need_unlock = 0;
4682 /* Only read lock if we haven't already write locked, e.g. rollback */
4683 if (!RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock)) {
4685 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
4687 if (zp->z_sa_hdl == NULL) {
4689 rw_exit(&zfsvfs->z_teardown_inactive_lock);
4693 if (zp->z_atime_dirty && zp->z_unlinked == 0) {
4694 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);
4696 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4697 zfs_sa_upgrade_txholds(tx, zp);
4698 error = dmu_tx_assign(tx, TXG_WAIT);
4702 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4703 mutex_enter(&zp->z_lock);
4704 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
4705 (void *)&atime, sizeof (atime), tx);
4706 zp->z_atime_dirty = 0;
4707 mutex_exit(&zp->z_lock);
4714 rw_exit(&zfsvfs->z_teardown_inactive_lock);
4718 * Bounds-check the seek operation.
4720 * IN: ip - inode seeking within
4721 * ooff - old file offset
4722 * noffp - pointer to new file offset
4723 * ct - caller context
4725 * RETURN: 0 if success
4726 * EINVAL if new offset invalid
4730 zfs_seek(struct inode *ip, offset_t ooff, offset_t *noffp)
4732 if (S_ISDIR(ip->i_mode))
4734 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
4738 * Fill pages with data from the disk.
4741 zfs_fillpage(struct inode *ip, struct page *pl[], int nr_pages)
4743 znode_t *zp = ITOZ(ip);
4744 zfsvfs_t *zfsvfs = ITOZSB(ip);
4746 struct page *cur_pp;
4747 u_offset_t io_off, total;
4754 io_len = nr_pages << PAGE_SHIFT;
4755 i_size = i_size_read(ip);
4756 io_off = page_offset(pl[0]);
4758 if (io_off + io_len > i_size)
4759 io_len = i_size - io_off;
4762 * Iterate over list of pages and read each page individually.
4765 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
4768 cur_pp = pl[page_idx++];
4770 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
4774 /* convert checksum errors into IO errors */
4776 err = SET_ERROR(EIO);
4785 * Uses zfs_fillpage to read data from the file and fill the pages.
4787 * IN: ip - inode of file to get data from.
4788 * pl - list of pages to read
4789 * nr_pages - number of pages to read
4791 * RETURN: 0 on success, error code on failure.
4794 * vp - atime updated
4798 zfs_getpage(struct inode *ip, struct page *pl[], int nr_pages)
4800 znode_t *zp = ITOZ(ip);
4801 zfsvfs_t *zfsvfs = ITOZSB(ip);
4810 err = zfs_fillpage(ip, pl, nr_pages);
4817 * Check ZFS specific permissions to memory map a section of a file.
4819 * IN: ip - inode of the file to mmap
4821 * addrp - start address in memory region
4822 * len - length of memory region
4823 * vm_flags- address flags
4825 * RETURN: 0 if success
4826 * error code if failure
4830 zfs_map(struct inode *ip, offset_t off, caddr_t *addrp, size_t len,
4831 unsigned long vm_flags)
4833 znode_t *zp = ITOZ(ip);
4834 zfsvfs_t *zfsvfs = ITOZSB(ip);
4839 if ((vm_flags & VM_WRITE) && (zp->z_pflags &
4840 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
4842 return (SET_ERROR(EPERM));
4845 if ((vm_flags & (VM_READ | VM_EXEC)) &&
4846 (zp->z_pflags & ZFS_AV_QUARANTINED)) {
4848 return (SET_ERROR(EACCES));
4851 if (off < 0 || len > MAXOFFSET_T - off) {
4853 return (SET_ERROR(ENXIO));
4861 * convoff - converts the given data (start, whence) to the
4865 convoff(struct inode *ip, flock64_t *lckdat, int whence, offset_t offset)
4870 if ((lckdat->l_whence == SEEK_END) || (whence == SEEK_END)) {
4871 if ((error = zfs_getattr(ip, &vap, 0, CRED())))
4875 switch (lckdat->l_whence) {
4877 lckdat->l_start += offset;
4880 lckdat->l_start += vap.va_size;
4885 return (SET_ERROR(EINVAL));
4888 if (lckdat->l_start < 0)
4889 return (SET_ERROR(EINVAL));
4893 lckdat->l_start -= offset;
4896 lckdat->l_start -= vap.va_size;
4901 return (SET_ERROR(EINVAL));
4904 lckdat->l_whence = (short)whence;
4909 * Free or allocate space in a file. Currently, this function only
4910 * supports the `F_FREESP' command. However, this command is somewhat
4911 * misnamed, as its functionality includes the ability to allocate as
4912 * well as free space.
4914 * IN: ip - inode of file to free data in.
4915 * cmd - action to take (only F_FREESP supported).
4916 * bfp - section of file to free/alloc.
4917 * flag - current file open mode flags.
4918 * offset - current file offset.
4919 * cr - credentials of caller.
4921 * RETURN: 0 on success, error code on failure.
4924 * ip - ctime|mtime updated
4928 zfs_space(struct inode *ip, int cmd, flock64_t *bfp, int flag,
4929 offset_t offset, cred_t *cr)
4931 znode_t *zp = ITOZ(ip);
4932 zfsvfs_t *zfsvfs = ITOZSB(ip);
4939 if (cmd != F_FREESP) {
4941 return (SET_ERROR(EINVAL));
4945 * Callers might not be able to detect properly that we are read-only,
4946 * so check it explicitly here.
4948 if (zfs_is_readonly(zfsvfs)) {
4950 return (SET_ERROR(EROFS));
4953 if ((error = convoff(ip, bfp, SEEK_SET, offset))) {
4958 if (bfp->l_len < 0) {
4960 return (SET_ERROR(EINVAL));
4964 * Permissions aren't checked on Solaris because on this OS
4965 * zfs_space() can only be called with an opened file handle.
4966 * On Linux we can get here through truncate_range() which
4967 * operates directly on inodes, so we need to check access rights.
4969 if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr))) {
4975 len = bfp->l_len; /* 0 means from off to end of file */
4977 error = zfs_freesp(zp, off, len, flag, TRUE);
4985 zfs_fid(struct inode *ip, fid_t *fidp)
4987 znode_t *zp = ITOZ(ip);
4988 zfsvfs_t *zfsvfs = ITOZSB(ip);
4991 uint64_t object = zp->z_id;
4998 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
4999 &gen64, sizeof (uint64_t))) != 0) {
5004 gen = (uint32_t)gen64;
5006 size = SHORT_FID_LEN;
5008 zfid = (zfid_short_t *)fidp;
5010 zfid->zf_len = size;
5012 for (i = 0; i < sizeof (zfid->zf_object); i++)
5013 zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
5015 /* Must have a non-zero generation number to distinguish from .zfs */
5018 for (i = 0; i < sizeof (zfid->zf_gen); i++)
5019 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
5027 zfs_getsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
5029 znode_t *zp = ITOZ(ip);
5030 zfsvfs_t *zfsvfs = ITOZSB(ip);
5032 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
5036 error = zfs_getacl(zp, vsecp, skipaclchk, cr);
5044 zfs_setsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
5046 znode_t *zp = ITOZ(ip);
5047 zfsvfs_t *zfsvfs = ITOZSB(ip);
5049 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
5050 zilog_t *zilog = zfsvfs->z_log;
5055 error = zfs_setacl(zp, vsecp, skipaclchk, cr);
5057 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
5058 zil_commit(zilog, 0);
5064 #ifdef HAVE_UIO_ZEROCOPY
5066 * Tunable, both must be a power of 2.
5068 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
5069 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
5070 * an arcbuf for a partial block read
5072 int zcr_blksz_min = (1 << 10); /* 1K */
5073 int zcr_blksz_max = (1 << 17); /* 128K */
5077 zfs_reqzcbuf(struct inode *ip, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr)
5079 znode_t *zp = ITOZ(ip);
5080 zfsvfs_t *zfsvfs = ITOZSB(ip);
5081 int max_blksz = zfsvfs->z_max_blksz;
5082 uio_t *uio = &xuio->xu_uio;
5083 ssize_t size = uio->uio_resid;
5084 offset_t offset = uio->uio_loffset;
5089 int preamble, postamble;
5091 if (xuio->xu_type != UIOTYPE_ZEROCOPY)
5092 return (SET_ERROR(EINVAL));
5099 * Loan out an arc_buf for write if write size is bigger than
5100 * max_blksz, and the file's block size is also max_blksz.
5103 if (size < blksz || zp->z_blksz != blksz) {
5105 return (SET_ERROR(EINVAL));
5108 * Caller requests buffers for write before knowing where the
5109 * write offset might be (e.g. NFS TCP write).
5114 preamble = P2PHASE(offset, blksz);
5116 preamble = blksz - preamble;
5121 postamble = P2PHASE(size, blksz);
5124 fullblk = size / blksz;
5125 (void) dmu_xuio_init(xuio,
5126 (preamble != 0) + fullblk + (postamble != 0));
5129 * Have to fix iov base/len for partial buffers. They
5130 * currently represent full arc_buf's.
5133 /* data begins in the middle of the arc_buf */
5134 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5137 (void) dmu_xuio_add(xuio, abuf,
5138 blksz - preamble, preamble);
5141 for (i = 0; i < fullblk; i++) {
5142 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5145 (void) dmu_xuio_add(xuio, abuf, 0, blksz);
5149 /* data ends in the middle of the arc_buf */
5150 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5153 (void) dmu_xuio_add(xuio, abuf, 0, postamble);
5158 * Loan out an arc_buf for read if the read size is larger than
5159 * the current file block size. Block alignment is not
5160 * considered. Partial arc_buf will be loaned out for read.
5162 blksz = zp->z_blksz;
5163 if (blksz < zcr_blksz_min)
5164 blksz = zcr_blksz_min;
5165 if (blksz > zcr_blksz_max)
5166 blksz = zcr_blksz_max;
5167 /* avoid potential complexity of dealing with it */
5168 if (blksz > max_blksz) {
5170 return (SET_ERROR(EINVAL));
5173 maxsize = zp->z_size - uio->uio_loffset;
5179 return (SET_ERROR(EINVAL));
5184 return (SET_ERROR(EINVAL));
5187 uio->uio_extflg = UIO_XUIO;
5188 XUIO_XUZC_RW(xuio) = ioflag;
5195 zfs_retzcbuf(struct inode *ip, xuio_t *xuio, cred_t *cr)
5199 int ioflag = XUIO_XUZC_RW(xuio);
5201 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY);
5203 i = dmu_xuio_cnt(xuio);
5205 abuf = dmu_xuio_arcbuf(xuio, i);
5207 * if abuf == NULL, it must be a write buffer
5208 * that has been returned in zfs_write().
5211 dmu_return_arcbuf(abuf);
5212 ASSERT(abuf || ioflag == UIO_WRITE);
5215 dmu_xuio_fini(xuio);
5218 #endif /* HAVE_UIO_ZEROCOPY */
5220 #if defined(_KERNEL)
5221 EXPORT_SYMBOL(zfs_open);
5222 EXPORT_SYMBOL(zfs_close);
5223 EXPORT_SYMBOL(zfs_read);
5224 EXPORT_SYMBOL(zfs_write);
5225 EXPORT_SYMBOL(zfs_access);
5226 EXPORT_SYMBOL(zfs_lookup);
5227 EXPORT_SYMBOL(zfs_create);
5228 EXPORT_SYMBOL(zfs_tmpfile);
5229 EXPORT_SYMBOL(zfs_remove);
5230 EXPORT_SYMBOL(zfs_mkdir);
5231 EXPORT_SYMBOL(zfs_rmdir);
5232 EXPORT_SYMBOL(zfs_readdir);
5233 EXPORT_SYMBOL(zfs_fsync);
5234 EXPORT_SYMBOL(zfs_getattr);
5235 EXPORT_SYMBOL(zfs_getattr_fast);
5236 EXPORT_SYMBOL(zfs_setattr);
5237 EXPORT_SYMBOL(zfs_rename);
5238 EXPORT_SYMBOL(zfs_symlink);
5239 EXPORT_SYMBOL(zfs_readlink);
5240 EXPORT_SYMBOL(zfs_link);
5241 EXPORT_SYMBOL(zfs_inactive);
5242 EXPORT_SYMBOL(zfs_space);
5243 EXPORT_SYMBOL(zfs_fid);
5244 EXPORT_SYMBOL(zfs_getsecattr);
5245 EXPORT_SYMBOL(zfs_setsecattr);
5246 EXPORT_SYMBOL(zfs_getpage);
5247 EXPORT_SYMBOL(zfs_putpage);
5248 EXPORT_SYMBOL(zfs_dirty_inode);
5249 EXPORT_SYMBOL(zfs_map);
5252 module_param(zfs_delete_blocks, ulong, 0644);
5253 MODULE_PARM_DESC(zfs_delete_blocks, "Delete files larger than N blocks async");
5254 module_param(zfs_read_chunk_size, long, 0644);
5255 MODULE_PARM_DESC(zfs_read_chunk_size, "Bytes to read per chunk");