4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
24 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2015 by Chunwei Chen. All rights reserved.
28 /* Portions Copyright 2007 Jeremy Teo */
29 /* Portions Copyright 2010 Robert Milkowski */
32 #include <sys/types.h>
33 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/sysmacros.h>
37 #include <sys/resource.h>
39 #include <sys/vfs_opreg.h>
43 #include <sys/taskq.h>
45 #include <sys/vmsystm.h>
46 #include <sys/atomic.h>
48 #include <sys/pathname.h>
49 #include <sys/cmn_err.h>
50 #include <sys/errno.h>
51 #include <sys/unistd.h>
52 #include <sys/zfs_dir.h>
53 #include <sys/zfs_acl.h>
54 #include <sys/zfs_ioctl.h>
55 #include <sys/fs/zfs.h>
57 #include <sys/dmu_objset.h>
63 #include <sys/dirent.h>
64 #include <sys/policy.h>
65 #include <sys/sunddi.h>
68 #include "fs/fs_subr.h"
69 #include <sys/zfs_ctldir.h>
70 #include <sys/zfs_fuid.h>
71 #include <sys/zfs_sa.h>
72 #include <sys/zfs_vnops.h>
74 #include <sys/zfs_rlock.h>
75 #include <sys/extdirent.h>
76 #include <sys/kidmap.h>
84 * Each vnode op performs some logical unit of work. To do this, the ZPL must
85 * properly lock its in-core state, create a DMU transaction, do the work,
86 * record this work in the intent log (ZIL), commit the DMU transaction,
87 * and wait for the intent log to commit if it is a synchronous operation.
88 * Moreover, the vnode ops must work in both normal and log replay context.
89 * The ordering of events is important to avoid deadlocks and references
90 * to freed memory. The example below illustrates the following Big Rules:
92 * (1) A check must be made in each zfs thread for a mounted file system.
93 * This is done avoiding races using ZFS_ENTER(zsb).
94 * A ZFS_EXIT(zsb) is needed before all returns. Any znodes
95 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
96 * can return EIO from the calling function.
98 * (2) iput() should always be the last thing except for zil_commit()
99 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
100 * First, if it's the last reference, the vnode/znode
101 * can be freed, so the zp may point to freed memory. Second, the last
102 * reference will call zfs_zinactive(), which may induce a lot of work --
103 * pushing cached pages (which acquires range locks) and syncing out
104 * cached atime changes. Third, zfs_zinactive() may require a new tx,
105 * which could deadlock the system if you were already holding one.
106 * If you must call iput() within a tx then use zfs_iput_async().
108 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
109 * as they can span dmu_tx_assign() calls.
111 * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
112 * dmu_tx_assign(). This is critical because we don't want to block
113 * while holding locks.
115 * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
116 * reduces lock contention and CPU usage when we must wait (note that if
117 * throughput is constrained by the storage, nearly every transaction
120 * Note, in particular, that if a lock is sometimes acquired before
121 * the tx assigns, and sometimes after (e.g. z_lock), then failing
122 * to use a non-blocking assign can deadlock the system. The scenario:
124 * Thread A has grabbed a lock before calling dmu_tx_assign().
125 * Thread B is in an already-assigned tx, and blocks for this lock.
126 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
127 * forever, because the previous txg can't quiesce until B's tx commits.
129 * If dmu_tx_assign() returns ERESTART and zsb->z_assign is TXG_NOWAIT,
130 * then drop all locks, call dmu_tx_wait(), and try again. On subsequent
131 * calls to dmu_tx_assign(), pass TXG_WAITED rather than TXG_NOWAIT,
132 * to indicate that this operation has already called dmu_tx_wait().
133 * This will ensure that we don't retry forever, waiting a short bit
136 * (5) If the operation succeeded, generate the intent log entry for it
137 * before dropping locks. This ensures that the ordering of events
138 * in the intent log matches the order in which they actually occurred.
139 * During ZIL replay the zfs_log_* functions will update the sequence
140 * number to indicate the zil transaction has replayed.
142 * (6) At the end of each vnode op, the DMU tx must always commit,
143 * regardless of whether there were any errors.
145 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
146 * to ensure that synchronous semantics are provided when necessary.
148 * In general, this is how things should be ordered in each vnode op:
150 * ZFS_ENTER(zsb); // exit if unmounted
152 * zfs_dirent_lock(&dl, ...) // lock directory entry (may igrab())
153 * rw_enter(...); // grab any other locks you need
154 * tx = dmu_tx_create(...); // get DMU tx
155 * dmu_tx_hold_*(); // hold each object you might modify
156 * error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
158 * rw_exit(...); // drop locks
159 * zfs_dirent_unlock(dl); // unlock directory entry
160 * iput(...); // release held vnodes
161 * if (error == ERESTART) {
167 * dmu_tx_abort(tx); // abort DMU tx
168 * ZFS_EXIT(zsb); // finished in zfs
169 * return (error); // really out of space
171 * error = do_real_work(); // do whatever this VOP does
173 * zfs_log_*(...); // on success, make ZIL entry
174 * dmu_tx_commit(tx); // commit DMU tx -- error or not
175 * rw_exit(...); // drop locks
176 * zfs_dirent_unlock(dl); // unlock directory entry
177 * iput(...); // release held vnodes
178 * zil_commit(zilog, foid); // synchronous when necessary
179 * ZFS_EXIT(zsb); // finished in zfs
180 * return (error); // done, report error
184 * Virus scanning is unsupported. It would be possible to add a hook
185 * here to performance the required virus scan. This could be done
186 * entirely in the kernel or potentially as an update to invoke a
190 zfs_vscan(struct inode *ip, cred_t *cr, int async)
197 zfs_open(struct inode *ip, int mode, int flag, cred_t *cr)
199 znode_t *zp = ITOZ(ip);
200 zfs_sb_t *zsb = ITOZSB(ip);
205 /* Honor ZFS_APPENDONLY file attribute */
206 if ((mode & FMODE_WRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
207 ((flag & O_APPEND) == 0)) {
209 return (SET_ERROR(EPERM));
212 /* Virus scan eligible files on open */
213 if (!zfs_has_ctldir(zp) && zsb->z_vscan && S_ISREG(ip->i_mode) &&
214 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
215 if (zfs_vscan(ip, cr, 0) != 0) {
217 return (SET_ERROR(EACCES));
221 /* Keep a count of the synchronous opens in the znode */
223 atomic_inc_32(&zp->z_sync_cnt);
228 EXPORT_SYMBOL(zfs_open);
232 zfs_close(struct inode *ip, int flag, cred_t *cr)
234 znode_t *zp = ITOZ(ip);
235 zfs_sb_t *zsb = ITOZSB(ip);
240 /* Decrement the synchronous opens in the znode */
242 atomic_dec_32(&zp->z_sync_cnt);
244 if (!zfs_has_ctldir(zp) && zsb->z_vscan && S_ISREG(ip->i_mode) &&
245 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
246 VERIFY(zfs_vscan(ip, cr, 1) == 0);
251 EXPORT_SYMBOL(zfs_close);
253 #if defined(SEEK_HOLE) && defined(SEEK_DATA)
255 * Lseek support for finding holes (cmd == SEEK_HOLE) and
256 * data (cmd == SEEK_DATA). "off" is an in/out parameter.
259 zfs_holey_common(struct inode *ip, int cmd, loff_t *off)
261 znode_t *zp = ITOZ(ip);
262 uint64_t noff = (uint64_t)*off; /* new offset */
267 file_sz = zp->z_size;
268 if (noff >= file_sz) {
269 return (SET_ERROR(ENXIO));
272 if (cmd == SEEK_HOLE)
277 error = dmu_offset_next(ZTOZSB(zp)->z_os, zp->z_id, hole, &noff);
280 return (SET_ERROR(ENXIO));
283 * We could find a hole that begins after the logical end-of-file,
284 * because dmu_offset_next() only works on whole blocks. If the
285 * EOF falls mid-block, then indicate that the "virtual hole"
286 * at the end of the file begins at the logical EOF, rather than
287 * at the end of the last block.
289 if (noff > file_sz) {
301 zfs_holey(struct inode *ip, int cmd, loff_t *off)
303 znode_t *zp = ITOZ(ip);
304 zfs_sb_t *zsb = ITOZSB(ip);
310 error = zfs_holey_common(ip, cmd, off);
315 EXPORT_SYMBOL(zfs_holey);
316 #endif /* SEEK_HOLE && SEEK_DATA */
320 * When a file is memory mapped, we must keep the IO data synchronized
321 * between the DMU cache and the memory mapped pages. What this means:
323 * On Write: If we find a memory mapped page, we write to *both*
324 * the page and the dmu buffer.
327 update_pages(struct inode *ip, int64_t start, int len,
328 objset_t *os, uint64_t oid)
330 struct address_space *mp = ip->i_mapping;
336 off = start & (PAGE_SIZE-1);
337 for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
338 nbytes = MIN(PAGE_SIZE - off, len);
340 pp = find_lock_page(mp, start >> PAGE_SHIFT);
342 if (mapping_writably_mapped(mp))
343 flush_dcache_page(pp);
346 (void) dmu_read(os, oid, start+off, nbytes, pb+off,
350 if (mapping_writably_mapped(mp))
351 flush_dcache_page(pp);
353 mark_page_accessed(pp);
366 * When a file is memory mapped, we must keep the IO data synchronized
367 * between the DMU cache and the memory mapped pages. What this means:
369 * On Read: We "read" preferentially from memory mapped pages,
370 * else we default from the dmu buffer.
372 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
373 * the file is memory mapped.
376 mappedread(struct inode *ip, int nbytes, uio_t *uio)
378 struct address_space *mp = ip->i_mapping;
380 znode_t *zp = ITOZ(ip);
387 start = uio->uio_loffset;
388 off = start & (PAGE_SIZE-1);
389 for (start &= PAGE_MASK; len > 0; start += PAGE_SIZE) {
390 bytes = MIN(PAGE_SIZE - off, len);
392 pp = find_lock_page(mp, start >> PAGE_SHIFT);
394 ASSERT(PageUptodate(pp));
397 error = uiomove(pb + off, bytes, UIO_READ, uio);
400 if (mapping_writably_mapped(mp))
401 flush_dcache_page(pp);
403 mark_page_accessed(pp);
407 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
420 unsigned long zfs_read_chunk_size = 1024 * 1024; /* Tunable */
421 unsigned long zfs_delete_blocks = DMU_MAX_DELETEBLKCNT;
424 * Read bytes from specified file into supplied buffer.
426 * IN: ip - inode of file to be read from.
427 * uio - structure supplying read location, range info,
429 * ioflag - FSYNC flags; used to provide FRSYNC semantics.
430 * O_DIRECT flag; used to bypass page cache.
431 * cr - credentials of caller.
433 * OUT: uio - updated offset and range, buffer filled.
435 * RETURN: 0 on success, error code on failure.
438 * inode - atime updated if byte count > 0
442 zfs_read(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
444 znode_t *zp = ITOZ(ip);
445 zfs_sb_t *zsb = ITOZSB(ip);
449 #ifdef HAVE_UIO_ZEROCOPY
451 #endif /* HAVE_UIO_ZEROCOPY */
456 if (zp->z_pflags & ZFS_AV_QUARANTINED) {
458 return (SET_ERROR(EACCES));
462 * Validate file offset
464 if (uio->uio_loffset < (offset_t)0) {
466 return (SET_ERROR(EINVAL));
470 * Fasttrack empty reads
472 if (uio->uio_resid == 0) {
478 * If we're in FRSYNC mode, sync out this znode before reading it.
480 if (ioflag & FRSYNC || zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
481 zil_commit(zsb->z_log, zp->z_id);
484 * Lock the range against changes.
486 rl = zfs_range_lock(&zp->z_range_lock, uio->uio_loffset, uio->uio_resid,
490 * If we are reading past end-of-file we can skip
491 * to the end; but we might still need to set atime.
493 if (uio->uio_loffset >= zp->z_size) {
498 ASSERT(uio->uio_loffset < zp->z_size);
499 n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset);
501 #ifdef HAVE_UIO_ZEROCOPY
502 if ((uio->uio_extflg == UIO_XUIO) &&
503 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) {
505 int blksz = zp->z_blksz;
506 uint64_t offset = uio->uio_loffset;
508 xuio = (xuio_t *)uio;
510 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset,
513 ASSERT(offset + n <= blksz);
516 (void) dmu_xuio_init(xuio, nblk);
518 if (vn_has_cached_data(ip)) {
520 * For simplicity, we always allocate a full buffer
521 * even if we only expect to read a portion of a block.
523 while (--nblk >= 0) {
524 (void) dmu_xuio_add(xuio,
525 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
530 #endif /* HAVE_UIO_ZEROCOPY */
533 nbytes = MIN(n, zfs_read_chunk_size -
534 P2PHASE(uio->uio_loffset, zfs_read_chunk_size));
536 if (zp->z_is_mapped && !(ioflag & O_DIRECT)) {
537 error = mappedread(ip, nbytes, uio);
539 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
544 /* convert checksum errors into IO errors */
546 error = SET_ERROR(EIO);
553 zfs_range_unlock(rl);
558 EXPORT_SYMBOL(zfs_read);
561 * Write the bytes to a file.
563 * IN: ip - inode of file to be written to.
564 * uio - structure supplying write location, range info,
566 * ioflag - FAPPEND flag set if in append mode.
567 * O_DIRECT flag; used to bypass page cache.
568 * cr - credentials of caller.
570 * OUT: uio - updated offset and range.
572 * RETURN: 0 if success
573 * error code if failure
576 * ip - ctime|mtime updated if byte count > 0
581 zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
583 znode_t *zp = ITOZ(ip);
584 rlim64_t limit = uio->uio_limit;
585 ssize_t start_resid = uio->uio_resid;
589 zfs_sb_t *zsb = ZTOZSB(zp);
594 int max_blksz = zsb->z_max_blksz;
597 const iovec_t *aiov = NULL;
600 const iovec_t *iovp = uio->uio_iov;
603 sa_bulk_attr_t bulk[4];
604 uint64_t mtime[2], ctime[2];
605 ASSERTV(int iovcnt = uio->uio_iovcnt);
608 * Fasttrack empty write
614 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
620 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
621 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
622 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zsb), NULL, &zp->z_size, 8);
623 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
627 * Callers might not be able to detect properly that we are read-only,
628 * so check it explicitly here.
630 if (zfs_is_readonly(zsb)) {
632 return (SET_ERROR(EROFS));
636 * If immutable or not appending then return EPERM
638 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
639 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) &&
640 (uio->uio_loffset < zp->z_size))) {
642 return (SET_ERROR(EPERM));
648 * Validate file offset
650 woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset;
653 return (SET_ERROR(EINVAL));
657 * Pre-fault the pages to ensure slow (eg NFS) pages
659 * Skip this if uio contains loaned arc_buf.
661 #ifdef HAVE_UIO_ZEROCOPY
662 if ((uio->uio_extflg == UIO_XUIO) &&
663 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY))
664 xuio = (xuio_t *)uio;
667 uio_prefaultpages(MIN(n, max_blksz), uio);
670 * If in append mode, set the io offset pointer to eof.
672 if (ioflag & FAPPEND) {
674 * Obtain an appending range lock to guarantee file append
675 * semantics. We reset the write offset once we have the lock.
677 rl = zfs_range_lock(&zp->z_range_lock, 0, n, RL_APPEND);
679 if (rl->r_len == UINT64_MAX) {
681 * We overlocked the file because this write will cause
682 * the file block size to increase.
683 * Note that zp_size cannot change with this lock held.
687 uio->uio_loffset = woff;
690 * Note that if the file block size will change as a result of
691 * this write, then this range lock will lock the entire file
692 * so that we can re-write the block safely.
694 rl = zfs_range_lock(&zp->z_range_lock, woff, n, RL_WRITER);
698 zfs_range_unlock(rl);
700 return (SET_ERROR(EFBIG));
703 if ((woff + n) > limit || woff > (limit - n))
706 /* Will this write extend the file length? */
707 write_eof = (woff + n > zp->z_size);
709 end_size = MAX(zp->z_size, woff + n);
712 * Write the file in reasonable size chunks. Each chunk is written
713 * in a separate transaction; this keeps the intent log records small
714 * and allows us to do more fine-grained space accounting.
718 woff = uio->uio_loffset;
719 if (zfs_owner_overquota(zsb, zp, B_FALSE) ||
720 zfs_owner_overquota(zsb, zp, B_TRUE)) {
722 dmu_return_arcbuf(abuf);
723 error = SET_ERROR(EDQUOT);
727 if (xuio && abuf == NULL) {
728 ASSERT(i_iov < iovcnt);
729 ASSERT3U(uio->uio_segflg, !=, UIO_BVEC);
731 abuf = dmu_xuio_arcbuf(xuio, i_iov);
732 dmu_xuio_clear(xuio, i_iov);
733 ASSERT((aiov->iov_base == abuf->b_data) ||
734 ((char *)aiov->iov_base - (char *)abuf->b_data +
735 aiov->iov_len == arc_buf_size(abuf)));
737 } else if (abuf == NULL && n >= max_blksz &&
738 woff >= zp->z_size &&
739 P2PHASE(woff, max_blksz) == 0 &&
740 zp->z_blksz == max_blksz) {
742 * This write covers a full block. "Borrow" a buffer
743 * from the dmu so that we can fill it before we enter
744 * a transaction. This avoids the possibility of
745 * holding up the transaction if the data copy hangs
746 * up on a pagefault (e.g., from an NFS server mapping).
750 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
752 ASSERT(abuf != NULL);
753 ASSERT(arc_buf_size(abuf) == max_blksz);
754 if ((error = uiocopy(abuf->b_data, max_blksz,
755 UIO_WRITE, uio, &cbytes))) {
756 dmu_return_arcbuf(abuf);
759 ASSERT(cbytes == max_blksz);
763 * Start a transaction.
765 tx = dmu_tx_create(zsb->z_os);
766 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
767 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz));
768 zfs_sa_upgrade_txholds(tx, zp);
769 error = dmu_tx_assign(tx, TXG_WAIT);
773 dmu_return_arcbuf(abuf);
778 * If zfs_range_lock() over-locked we grow the blocksize
779 * and then reduce the lock range. This will only happen
780 * on the first iteration since zfs_range_reduce() will
781 * shrink down r_len to the appropriate size.
783 if (rl->r_len == UINT64_MAX) {
786 if (zp->z_blksz > max_blksz) {
788 * File's blocksize is already larger than the
789 * "recordsize" property. Only let it grow to
790 * the next power of 2.
792 ASSERT(!ISP2(zp->z_blksz));
793 new_blksz = MIN(end_size,
794 1 << highbit64(zp->z_blksz));
796 new_blksz = MIN(end_size, max_blksz);
798 zfs_grow_blocksize(zp, new_blksz, tx);
799 zfs_range_reduce(rl, woff, n);
803 * XXX - should we really limit each write to z_max_blksz?
804 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
806 nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz));
809 tx_bytes = uio->uio_resid;
810 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
812 tx_bytes -= uio->uio_resid;
815 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len);
817 * If this is not a full block write, but we are
818 * extending the file past EOF and this data starts
819 * block-aligned, use assign_arcbuf(). Otherwise,
820 * write via dmu_write().
822 if (tx_bytes < max_blksz && (!write_eof ||
823 aiov->iov_base != abuf->b_data)) {
825 dmu_write(zsb->z_os, zp->z_id, woff,
826 aiov->iov_len, aiov->iov_base, tx);
827 dmu_return_arcbuf(abuf);
828 xuio_stat_wbuf_copied();
830 ASSERT(xuio || tx_bytes == max_blksz);
831 dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl),
834 ASSERT(tx_bytes <= uio->uio_resid);
835 uioskip(uio, tx_bytes);
838 if (tx_bytes && zp->z_is_mapped && !(ioflag & O_DIRECT))
839 update_pages(ip, woff, tx_bytes, zsb->z_os, zp->z_id);
842 * If we made no progress, we're done. If we made even
843 * partial progress, update the znode and ZIL accordingly.
846 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zsb),
847 (void *)&zp->z_size, sizeof (uint64_t), tx);
854 * Clear Set-UID/Set-GID bits on successful write if not
855 * privileged and at least one of the excute bits is set.
857 * It would be nice to to this after all writes have
858 * been done, but that would still expose the ISUID/ISGID
859 * to another app after the partial write is committed.
861 * Note: we don't call zfs_fuid_map_id() here because
862 * user 0 is not an ephemeral uid.
864 mutex_enter(&zp->z_acl_lock);
865 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) |
866 (S_IXUSR >> 6))) != 0 &&
867 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 &&
868 secpolicy_vnode_setid_retain(cr,
869 (zp->z_mode & S_ISUID) != 0 && zp->z_uid == 0) != 0) {
871 zp->z_mode &= ~(S_ISUID | S_ISGID);
872 newmode = zp->z_mode;
873 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zsb),
874 (void *)&newmode, sizeof (uint64_t), tx);
876 mutex_exit(&zp->z_acl_lock);
878 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
881 * Update the file size (zp_size) if it has changed;
882 * account for possible concurrent updates.
884 while ((end_size = zp->z_size) < uio->uio_loffset) {
885 (void) atomic_cas_64(&zp->z_size, end_size,
890 * If we are replaying and eof is non zero then force
891 * the file size to the specified eof. Note, there's no
892 * concurrency during replay.
894 if (zsb->z_replay && zsb->z_replay_eof != 0)
895 zp->z_size = zsb->z_replay_eof;
897 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
899 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag,
905 ASSERT(tx_bytes == nbytes);
909 uio_prefaultpages(MIN(n, max_blksz), uio);
912 zfs_inode_update(zp);
913 zfs_range_unlock(rl);
916 * If we're in replay mode, or we made no progress, return error.
917 * Otherwise, it's at least a partial write, so it's successful.
919 if (zsb->z_replay || uio->uio_resid == start_resid) {
924 if (ioflag & (FSYNC | FDSYNC) ||
925 zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
926 zil_commit(zilog, zp->z_id);
931 EXPORT_SYMBOL(zfs_write);
934 zfs_iput_async(struct inode *ip)
936 objset_t *os = ITOZSB(ip)->z_os;
938 ASSERT(atomic_read(&ip->i_count) > 0);
941 if (atomic_read(&ip->i_count) == 1)
942 taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os)),
943 (task_func_t *)iput, ip, TQ_SLEEP);
949 zfs_get_done(zgd_t *zgd, int error)
951 znode_t *zp = zgd->zgd_private;
954 dmu_buf_rele(zgd->zgd_db, zgd);
956 zfs_range_unlock(zgd->zgd_rl);
959 * Release the vnode asynchronously as we currently have the
960 * txg stopped from syncing.
962 zfs_iput_async(ZTOI(zp));
964 if (error == 0 && zgd->zgd_bp)
965 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
967 kmem_free(zgd, sizeof (zgd_t));
971 static int zil_fault_io = 0;
975 * Get data to generate a TX_WRITE intent log record.
978 zfs_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
981 objset_t *os = zsb->z_os;
983 uint64_t object = lr->lr_foid;
984 uint64_t offset = lr->lr_offset;
985 uint64_t size = lr->lr_length;
986 blkptr_t *bp = &lr->lr_blkptr;
995 * Nothing to do if the file has been removed
997 if (zfs_zget(zsb, object, &zp) != 0)
998 return (SET_ERROR(ENOENT));
999 if (zp->z_unlinked) {
1001 * Release the vnode asynchronously as we currently have the
1002 * txg stopped from syncing.
1004 zfs_iput_async(ZTOI(zp));
1005 return (SET_ERROR(ENOENT));
1008 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1009 zgd->zgd_zilog = zsb->z_log;
1010 zgd->zgd_private = zp;
1013 * Write records come in two flavors: immediate and indirect.
1014 * For small writes it's cheaper to store the data with the
1015 * log record (immediate); for large writes it's cheaper to
1016 * sync the data and get a pointer to it (indirect) so that
1017 * we don't have to write the data twice.
1019 if (buf != NULL) { /* immediate write */
1020 zgd->zgd_rl = zfs_range_lock(&zp->z_range_lock, offset, size,
1022 /* test for truncation needs to be done while range locked */
1023 if (offset >= zp->z_size) {
1024 error = SET_ERROR(ENOENT);
1026 error = dmu_read(os, object, offset, size, buf,
1027 DMU_READ_NO_PREFETCH);
1029 ASSERT(error == 0 || error == ENOENT);
1030 } else { /* indirect write */
1032 * Have to lock the whole block to ensure when it's
1033 * written out and it's checksum is being calculated
1034 * that no one can change the data. We need to re-check
1035 * blocksize after we get the lock in case it's changed!
1040 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset;
1042 zgd->zgd_rl = zfs_range_lock(&zp->z_range_lock, offset,
1044 if (zp->z_blksz == size)
1047 zfs_range_unlock(zgd->zgd_rl);
1049 /* test for truncation needs to be done while range locked */
1050 if (lr->lr_offset >= zp->z_size)
1051 error = SET_ERROR(ENOENT);
1054 error = SET_ERROR(EIO);
1059 error = dmu_buf_hold(os, object, offset, zgd, &db,
1060 DMU_READ_NO_PREFETCH);
1063 blkptr_t *obp = dmu_buf_get_blkptr(db);
1065 ASSERT(BP_IS_HOLE(bp));
1072 ASSERT(db->db_offset == offset);
1073 ASSERT(db->db_size == size);
1075 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1077 ASSERT(error || lr->lr_length <= zp->z_blksz);
1080 * On success, we need to wait for the write I/O
1081 * initiated by dmu_sync() to complete before we can
1082 * release this dbuf. We will finish everything up
1083 * in the zfs_get_done() callback.
1088 if (error == EALREADY) {
1089 lr->lr_common.lrc_txtype = TX_WRITE2;
1095 zfs_get_done(zgd, error);
1102 zfs_access(struct inode *ip, int mode, int flag, cred_t *cr)
1104 znode_t *zp = ITOZ(ip);
1105 zfs_sb_t *zsb = ITOZSB(ip);
1111 if (flag & V_ACE_MASK)
1112 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
1114 error = zfs_zaccess_rwx(zp, mode, flag, cr);
1119 EXPORT_SYMBOL(zfs_access);
1122 * Lookup an entry in a directory, or an extended attribute directory.
1123 * If it exists, return a held inode reference for it.
1125 * IN: dip - inode of directory to search.
1126 * nm - name of entry to lookup.
1127 * flags - LOOKUP_XATTR set if looking for an attribute.
1128 * cr - credentials of caller.
1129 * direntflags - directory lookup flags
1130 * realpnp - returned pathname.
1132 * OUT: ipp - inode of located entry, NULL if not found.
1134 * RETURN: 0 on success, error code on failure.
1141 zfs_lookup(struct inode *dip, char *nm, struct inode **ipp, int flags,
1142 cred_t *cr, int *direntflags, pathname_t *realpnp)
1144 znode_t *zdp = ITOZ(dip);
1145 zfs_sb_t *zsb = ITOZSB(dip);
1149 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
1151 if (!S_ISDIR(dip->i_mode)) {
1152 return (SET_ERROR(ENOTDIR));
1153 } else if (zdp->z_sa_hdl == NULL) {
1154 return (SET_ERROR(EIO));
1157 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
1158 error = zfs_fastaccesschk_execute(zdp, cr);
1167 vnode_t *tvp = dnlc_lookup(dvp, nm);
1170 error = zfs_fastaccesschk_execute(zdp, cr);
1175 if (tvp == DNLC_NO_VNODE) {
1177 return (SET_ERROR(ENOENT));
1180 return (specvp_check(vpp, cr));
1183 #endif /* HAVE_DNLC */
1192 if (flags & LOOKUP_XATTR) {
1194 * We don't allow recursive attributes..
1195 * Maybe someday we will.
1197 if (zdp->z_pflags & ZFS_XATTR) {
1199 return (SET_ERROR(EINVAL));
1202 if ((error = zfs_get_xattrdir(zdp, ipp, cr, flags))) {
1208 * Do we have permission to get into attribute directory?
1211 if ((error = zfs_zaccess(ITOZ(*ipp), ACE_EXECUTE, 0,
1221 if (!S_ISDIR(dip->i_mode)) {
1223 return (SET_ERROR(ENOTDIR));
1227 * Check accessibility of directory.
1230 if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr))) {
1235 if (zsb->z_utf8 && u8_validate(nm, strlen(nm),
1236 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1238 return (SET_ERROR(EILSEQ));
1241 error = zfs_dirlook(zdp, nm, ipp, flags, direntflags, realpnp);
1242 if ((error == 0) && (*ipp))
1243 zfs_inode_update(ITOZ(*ipp));
1248 EXPORT_SYMBOL(zfs_lookup);
1251 * Attempt to create a new entry in a directory. If the entry
1252 * already exists, truncate the file if permissible, else return
1253 * an error. Return the ip of the created or trunc'd file.
1255 * IN: dip - inode of directory to put new file entry in.
1256 * name - name of new file entry.
1257 * vap - attributes of new file.
1258 * excl - flag indicating exclusive or non-exclusive mode.
1259 * mode - mode to open file with.
1260 * cr - credentials of caller.
1261 * flag - large file flag [UNUSED].
1262 * vsecp - ACL to be set
1264 * OUT: ipp - inode of created or trunc'd entry.
1266 * RETURN: 0 on success, error code on failure.
1269 * dip - ctime|mtime updated if new entry created
1270 * ip - ctime|mtime always, atime if new
1275 zfs_create(struct inode *dip, char *name, vattr_t *vap, int excl,
1276 int mode, struct inode **ipp, cred_t *cr, int flag, vsecattr_t *vsecp)
1278 znode_t *zp, *dzp = ITOZ(dip);
1279 zfs_sb_t *zsb = ITOZSB(dip);
1287 zfs_acl_ids_t acl_ids;
1288 boolean_t fuid_dirtied;
1289 boolean_t have_acl = B_FALSE;
1290 boolean_t waited = B_FALSE;
1293 * If we have an ephemeral id, ACL, or XVATTR then
1294 * make sure file system is at proper version
1300 if (zsb->z_use_fuids == B_FALSE &&
1301 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1302 return (SET_ERROR(EINVAL));
1309 if (zsb->z_utf8 && u8_validate(name, strlen(name),
1310 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1312 return (SET_ERROR(EILSEQ));
1315 if (vap->va_mask & ATTR_XVATTR) {
1316 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1317 crgetuid(cr), cr, vap->va_mode)) != 0) {
1325 if (*name == '\0') {
1327 * Null component name refers to the directory itself.
1334 /* possible igrab(zp) */
1337 if (flag & FIGNORECASE)
1340 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1344 zfs_acl_ids_free(&acl_ids);
1345 if (strcmp(name, "..") == 0)
1346 error = SET_ERROR(EISDIR);
1356 * Create a new file object and update the directory
1359 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
1361 zfs_acl_ids_free(&acl_ids);
1366 * We only support the creation of regular files in
1367 * extended attribute directories.
1370 if ((dzp->z_pflags & ZFS_XATTR) && !S_ISREG(vap->va_mode)) {
1372 zfs_acl_ids_free(&acl_ids);
1373 error = SET_ERROR(EINVAL);
1377 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1378 cr, vsecp, &acl_ids)) != 0)
1382 if (zfs_acl_ids_overquota(zsb, &acl_ids)) {
1383 zfs_acl_ids_free(&acl_ids);
1384 error = SET_ERROR(EDQUOT);
1388 tx = dmu_tx_create(os);
1390 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1391 ZFS_SA_BASE_ATTR_SIZE);
1393 fuid_dirtied = zsb->z_fuid_dirty;
1395 zfs_fuid_txhold(zsb, tx);
1396 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
1397 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
1398 if (!zsb->z_use_sa &&
1399 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1400 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1401 0, acl_ids.z_aclp->z_acl_bytes);
1403 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1405 zfs_dirent_unlock(dl);
1406 if (error == ERESTART) {
1412 zfs_acl_ids_free(&acl_ids);
1417 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1420 zfs_fuid_sync(zsb, tx);
1422 (void) zfs_link_create(dl, zp, tx, ZNEW);
1423 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
1424 if (flag & FIGNORECASE)
1426 zfs_log_create(zilog, tx, txtype, dzp, zp, name,
1427 vsecp, acl_ids.z_fuidp, vap);
1428 zfs_acl_ids_free(&acl_ids);
1431 int aflags = (flag & FAPPEND) ? V_APPEND : 0;
1434 zfs_acl_ids_free(&acl_ids);
1438 * A directory entry already exists for this name.
1441 * Can't truncate an existing file if in exclusive mode.
1444 error = SET_ERROR(EEXIST);
1448 * Can't open a directory for writing.
1450 if (S_ISDIR(ZTOI(zp)->i_mode)) {
1451 error = SET_ERROR(EISDIR);
1455 * Verify requested access to file.
1457 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
1461 mutex_enter(&dzp->z_lock);
1463 mutex_exit(&dzp->z_lock);
1466 * Truncate regular files if requested.
1468 if (S_ISREG(ZTOI(zp)->i_mode) &&
1469 (vap->va_mask & ATTR_SIZE) && (vap->va_size == 0)) {
1470 /* we can't hold any locks when calling zfs_freesp() */
1471 zfs_dirent_unlock(dl);
1473 error = zfs_freesp(zp, 0, 0, mode, TRUE);
1479 zfs_dirent_unlock(dl);
1485 zfs_inode_update(dzp);
1486 zfs_inode_update(zp);
1490 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
1491 zil_commit(zilog, 0);
1496 EXPORT_SYMBOL(zfs_create);
1499 * Remove an entry from a directory.
1501 * IN: dip - inode of directory to remove entry from.
1502 * name - name of entry to remove.
1503 * cr - credentials of caller.
1505 * RETURN: 0 if success
1506 * error code if failure
1510 * ip - ctime (if nlink > 0)
1513 uint64_t null_xattr = 0;
1517 zfs_remove(struct inode *dip, char *name, cred_t *cr, int flags)
1519 znode_t *zp, *dzp = ITOZ(dip);
1522 zfs_sb_t *zsb = ITOZSB(dip);
1524 uint64_t acl_obj, xattr_obj;
1525 uint64_t xattr_obj_unlinked = 0;
1530 boolean_t may_delete_now, delete_now = FALSE;
1531 boolean_t unlinked, toobig = FALSE;
1533 pathname_t *realnmp = NULL;
1537 boolean_t waited = B_FALSE;
1543 if (flags & FIGNORECASE) {
1553 * Attempt to lock directory; fail if entry doesn't exist.
1555 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1565 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
1570 * Need to use rmdir for removing directories.
1572 if (S_ISDIR(ip->i_mode)) {
1573 error = SET_ERROR(EPERM);
1579 dnlc_remove(dvp, realnmp->pn_buf);
1581 dnlc_remove(dvp, name);
1582 #endif /* HAVE_DNLC */
1584 mutex_enter(&zp->z_lock);
1585 may_delete_now = atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped);
1586 mutex_exit(&zp->z_lock);
1589 * We may delete the znode now, or we may put it in the unlinked set;
1590 * it depends on whether we're the last link, and on whether there are
1591 * other holds on the inode. So we dmu_tx_hold() the right things to
1592 * allow for either case.
1595 tx = dmu_tx_create(zsb->z_os);
1596 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
1597 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1598 zfs_sa_upgrade_txholds(tx, zp);
1599 zfs_sa_upgrade_txholds(tx, dzp);
1600 if (may_delete_now) {
1601 toobig = zp->z_size > zp->z_blksz * zfs_delete_blocks;
1602 /* if the file is too big, only hold_free a token amount */
1603 dmu_tx_hold_free(tx, zp->z_id, 0,
1604 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
1607 /* are there any extended attributes? */
1608 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zsb),
1609 &xattr_obj, sizeof (xattr_obj));
1610 if (error == 0 && xattr_obj) {
1611 error = zfs_zget(zsb, xattr_obj, &xzp);
1613 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1614 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
1617 mutex_enter(&zp->z_lock);
1618 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
1619 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
1620 mutex_exit(&zp->z_lock);
1622 /* charge as an update -- would be nice not to charge at all */
1623 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
1626 * Mark this transaction as typically resulting in a net free of space
1628 dmu_tx_mark_netfree(tx);
1630 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1632 zfs_dirent_unlock(dl);
1636 if (error == ERESTART) {
1650 * Remove the directory entry.
1652 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
1661 * Hold z_lock so that we can make sure that the ACL obj
1662 * hasn't changed. Could have been deleted due to
1665 mutex_enter(&zp->z_lock);
1666 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zsb),
1667 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
1668 delete_now = may_delete_now && !toobig &&
1669 atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped) &&
1670 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) ==
1675 if (xattr_obj_unlinked) {
1676 ASSERT3U(ZTOI(xzp)->i_nlink, ==, 2);
1677 mutex_enter(&xzp->z_lock);
1678 xzp->z_unlinked = 1;
1679 clear_nlink(ZTOI(xzp));
1681 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zsb),
1682 &links, sizeof (links), tx);
1683 ASSERT3U(error, ==, 0);
1684 mutex_exit(&xzp->z_lock);
1685 zfs_unlinked_add(xzp, tx);
1688 error = sa_remove(zp->z_sa_hdl,
1689 SA_ZPL_XATTR(zsb), tx);
1691 error = sa_update(zp->z_sa_hdl,
1692 SA_ZPL_XATTR(zsb), &null_xattr,
1693 sizeof (uint64_t), tx);
1697 * Add to the unlinked set because a new reference could be
1698 * taken concurrently resulting in a deferred destruction.
1700 zfs_unlinked_add(zp, tx);
1701 mutex_exit(&zp->z_lock);
1702 zfs_inode_update(zp);
1704 } else if (unlinked) {
1705 mutex_exit(&zp->z_lock);
1706 zfs_unlinked_add(zp, tx);
1710 if (flags & FIGNORECASE)
1712 zfs_log_remove(zilog, tx, txtype, dzp, name, obj);
1719 zfs_dirent_unlock(dl);
1720 zfs_inode_update(dzp);
1723 zfs_inode_update(zp);
1728 zfs_inode_update(xzp);
1729 zfs_iput_async(ZTOI(xzp));
1732 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
1733 zil_commit(zilog, 0);
1738 EXPORT_SYMBOL(zfs_remove);
1741 * Create a new directory and insert it into dip using the name
1742 * provided. Return a pointer to the inserted directory.
1744 * IN: dip - inode of directory to add subdir to.
1745 * dirname - name of new directory.
1746 * vap - attributes of new directory.
1747 * cr - credentials of caller.
1748 * vsecp - ACL to be set
1750 * OUT: ipp - inode of created directory.
1752 * RETURN: 0 if success
1753 * error code if failure
1756 * dip - ctime|mtime updated
1757 * ipp - ctime|mtime|atime updated
1761 zfs_mkdir(struct inode *dip, char *dirname, vattr_t *vap, struct inode **ipp,
1762 cred_t *cr, int flags, vsecattr_t *vsecp)
1764 znode_t *zp, *dzp = ITOZ(dip);
1765 zfs_sb_t *zsb = ITOZSB(dip);
1773 gid_t gid = crgetgid(cr);
1774 zfs_acl_ids_t acl_ids;
1775 boolean_t fuid_dirtied;
1776 boolean_t waited = B_FALSE;
1778 ASSERT(S_ISDIR(vap->va_mode));
1781 * If we have an ephemeral id, ACL, or XVATTR then
1782 * make sure file system is at proper version
1786 if (zsb->z_use_fuids == B_FALSE &&
1787 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1788 return (SET_ERROR(EINVAL));
1794 if (dzp->z_pflags & ZFS_XATTR) {
1796 return (SET_ERROR(EINVAL));
1799 if (zsb->z_utf8 && u8_validate(dirname,
1800 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1802 return (SET_ERROR(EILSEQ));
1804 if (flags & FIGNORECASE)
1807 if (vap->va_mask & ATTR_XVATTR) {
1808 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1809 crgetuid(cr), cr, vap->va_mode)) != 0) {
1815 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
1816 vsecp, &acl_ids)) != 0) {
1821 * First make sure the new directory doesn't exist.
1823 * Existence is checked first to make sure we don't return
1824 * EACCES instead of EEXIST which can cause some applications
1830 if ((error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
1832 zfs_acl_ids_free(&acl_ids);
1837 if ((error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr))) {
1838 zfs_acl_ids_free(&acl_ids);
1839 zfs_dirent_unlock(dl);
1844 if (zfs_acl_ids_overquota(zsb, &acl_ids)) {
1845 zfs_acl_ids_free(&acl_ids);
1846 zfs_dirent_unlock(dl);
1848 return (SET_ERROR(EDQUOT));
1852 * Add a new entry to the directory.
1854 tx = dmu_tx_create(zsb->z_os);
1855 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
1856 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
1857 fuid_dirtied = zsb->z_fuid_dirty;
1859 zfs_fuid_txhold(zsb, tx);
1860 if (!zsb->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1861 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
1862 acl_ids.z_aclp->z_acl_bytes);
1865 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1866 ZFS_SA_BASE_ATTR_SIZE);
1868 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1870 zfs_dirent_unlock(dl);
1871 if (error == ERESTART) {
1877 zfs_acl_ids_free(&acl_ids);
1886 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1889 zfs_fuid_sync(zsb, tx);
1892 * Now put new name in parent dir.
1894 (void) zfs_link_create(dl, zp, tx, ZNEW);
1898 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
1899 if (flags & FIGNORECASE)
1901 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
1902 acl_ids.z_fuidp, vap);
1904 zfs_acl_ids_free(&acl_ids);
1908 zfs_dirent_unlock(dl);
1910 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
1911 zil_commit(zilog, 0);
1913 zfs_inode_update(dzp);
1914 zfs_inode_update(zp);
1918 EXPORT_SYMBOL(zfs_mkdir);
1921 * Remove a directory subdir entry. If the current working
1922 * directory is the same as the subdir to be removed, the
1925 * IN: dip - inode of directory to remove from.
1926 * name - name of directory to be removed.
1927 * cwd - inode of current working directory.
1928 * cr - credentials of caller.
1929 * flags - case flags
1931 * RETURN: 0 on success, error code on failure.
1934 * dip - ctime|mtime updated
1938 zfs_rmdir(struct inode *dip, char *name, struct inode *cwd, cred_t *cr,
1941 znode_t *dzp = ITOZ(dip);
1944 zfs_sb_t *zsb = ITOZSB(dip);
1950 boolean_t waited = B_FALSE;
1956 if (flags & FIGNORECASE)
1962 * Attempt to lock directory; fail if entry doesn't exist.
1964 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1972 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
1976 if (!S_ISDIR(ip->i_mode)) {
1977 error = SET_ERROR(ENOTDIR);
1982 error = SET_ERROR(EINVAL);
1987 * Grab a lock on the directory to make sure that noone is
1988 * trying to add (or lookup) entries while we are removing it.
1990 rw_enter(&zp->z_name_lock, RW_WRITER);
1993 * Grab a lock on the parent pointer to make sure we play well
1994 * with the treewalk and directory rename code.
1996 rw_enter(&zp->z_parent_lock, RW_WRITER);
1998 tx = dmu_tx_create(zsb->z_os);
1999 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
2000 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2001 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
2002 zfs_sa_upgrade_txholds(tx, zp);
2003 zfs_sa_upgrade_txholds(tx, dzp);
2004 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
2006 rw_exit(&zp->z_parent_lock);
2007 rw_exit(&zp->z_name_lock);
2008 zfs_dirent_unlock(dl);
2010 if (error == ERESTART) {
2021 error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
2024 uint64_t txtype = TX_RMDIR;
2025 if (flags & FIGNORECASE)
2027 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT);
2032 rw_exit(&zp->z_parent_lock);
2033 rw_exit(&zp->z_name_lock);
2035 zfs_dirent_unlock(dl);
2037 zfs_inode_update(dzp);
2038 zfs_inode_update(zp);
2041 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
2042 zil_commit(zilog, 0);
2047 EXPORT_SYMBOL(zfs_rmdir);
2050 * Read as many directory entries as will fit into the provided
2051 * dirent buffer from the given directory cursor position.
2053 * IN: ip - inode of directory to read.
2054 * dirent - buffer for directory entries.
2056 * OUT: dirent - filler buffer of directory entries.
2058 * RETURN: 0 if success
2059 * error code if failure
2062 * ip - atime updated
2064 * Note that the low 4 bits of the cookie returned by zap is always zero.
2065 * This allows us to use the low range for "special" directory entries:
2066 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2067 * we use the offset 2 for the '.zfs' directory.
2071 zfs_readdir(struct inode *ip, struct dir_context *ctx, cred_t *cr)
2073 znode_t *zp = ITOZ(ip);
2074 zfs_sb_t *zsb = ITOZSB(ip);
2077 zap_attribute_t zap;
2083 uint64_t offset; /* must be unsigned; checks for < 1 */
2088 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zsb),
2089 &parent, sizeof (parent))) != 0)
2093 * Quit if directory has been removed (posix)
2101 prefetch = zp->z_zn_prefetch;
2104 * Initialize the iterator cursor.
2108 * Start iteration from the beginning of the directory.
2110 zap_cursor_init(&zc, os, zp->z_id);
2113 * The offset is a serialized cursor.
2115 zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
2119 * Transform to file-system independent format
2124 * Special case `.', `..', and `.zfs'.
2127 (void) strcpy(zap.za_name, ".");
2128 zap.za_normalization_conflict = 0;
2131 } else if (offset == 1) {
2132 (void) strcpy(zap.za_name, "..");
2133 zap.za_normalization_conflict = 0;
2136 } else if (offset == 2 && zfs_show_ctldir(zp)) {
2137 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
2138 zap.za_normalization_conflict = 0;
2139 objnum = ZFSCTL_INO_ROOT;
2145 if ((error = zap_cursor_retrieve(&zc, &zap))) {
2146 if (error == ENOENT)
2153 * Allow multiple entries provided the first entry is
2154 * the object id. Non-zpl consumers may safely make
2155 * use of the additional space.
2157 * XXX: This should be a feature flag for compatibility
2159 if (zap.za_integer_length != 8 ||
2160 zap.za_num_integers == 0) {
2161 cmn_err(CE_WARN, "zap_readdir: bad directory "
2162 "entry, obj = %lld, offset = %lld, "
2163 "length = %d, num = %lld\n",
2164 (u_longlong_t)zp->z_id,
2165 (u_longlong_t)offset,
2166 zap.za_integer_length,
2167 (u_longlong_t)zap.za_num_integers);
2168 error = SET_ERROR(ENXIO);
2172 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
2173 type = ZFS_DIRENT_TYPE(zap.za_first_integer);
2176 done = !dir_emit(ctx, zap.za_name, strlen(zap.za_name),
2181 /* Prefetch znode */
2183 dmu_prefetch(os, objnum, 0, 0, 0,
2184 ZIO_PRIORITY_SYNC_READ);
2188 * Move to the next entry, fill in the previous offset.
2190 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) {
2191 zap_cursor_advance(&zc);
2192 offset = zap_cursor_serialize(&zc);
2198 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
2201 zap_cursor_fini(&zc);
2202 if (error == ENOENT)
2209 EXPORT_SYMBOL(zfs_readdir);
2211 ulong_t zfs_fsync_sync_cnt = 4;
2214 zfs_fsync(struct inode *ip, int syncflag, cred_t *cr)
2216 znode_t *zp = ITOZ(ip);
2217 zfs_sb_t *zsb = ITOZSB(ip);
2219 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt);
2221 if (zsb->z_os->os_sync != ZFS_SYNC_DISABLED) {
2224 zil_commit(zsb->z_log, zp->z_id);
2227 tsd_set(zfs_fsyncer_key, NULL);
2231 EXPORT_SYMBOL(zfs_fsync);
2235 * Get the requested file attributes and place them in the provided
2238 * IN: ip - inode of file.
2239 * vap - va_mask identifies requested attributes.
2240 * If ATTR_XVATTR set, then optional attrs are requested
2241 * flags - ATTR_NOACLCHECK (CIFS server context)
2242 * cr - credentials of caller.
2244 * OUT: vap - attribute values.
2246 * RETURN: 0 (always succeeds)
2250 zfs_getattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2252 znode_t *zp = ITOZ(ip);
2253 zfs_sb_t *zsb = ITOZSB(ip);
2256 uint64_t atime[2], mtime[2], ctime[2];
2257 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2258 xoptattr_t *xoap = NULL;
2259 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2260 sa_bulk_attr_t bulk[3];
2266 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);
2268 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zsb), NULL, &atime, 16);
2269 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
2270 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
2272 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
2278 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2279 * Also, if we are the owner don't bother, since owner should
2280 * always be allowed to read basic attributes of file.
2282 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
2283 (vap->va_uid != crgetuid(cr))) {
2284 if ((error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
2292 * Return all attributes. It's cheaper to provide the answer
2293 * than to determine whether we were asked the question.
2296 mutex_enter(&zp->z_lock);
2297 vap->va_type = vn_mode_to_vtype(zp->z_mode);
2298 vap->va_mode = zp->z_mode;
2299 vap->va_fsid = ZTOI(zp)->i_sb->s_dev;
2300 vap->va_nodeid = zp->z_id;
2301 if ((zp->z_id == zsb->z_root) && zfs_show_ctldir(zp))
2302 links = ZTOI(zp)->i_nlink + 1;
2304 links = ZTOI(zp)->i_nlink;
2305 vap->va_nlink = MIN(links, ZFS_LINK_MAX);
2306 vap->va_size = i_size_read(ip);
2307 vap->va_rdev = ip->i_rdev;
2308 vap->va_seq = ip->i_generation;
2311 * Add in any requested optional attributes and the create time.
2312 * Also set the corresponding bits in the returned attribute bitmap.
2314 if ((xoap = xva_getxoptattr(xvap)) != NULL && zsb->z_use_fuids) {
2315 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
2317 ((zp->z_pflags & ZFS_ARCHIVE) != 0);
2318 XVA_SET_RTN(xvap, XAT_ARCHIVE);
2321 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
2322 xoap->xoa_readonly =
2323 ((zp->z_pflags & ZFS_READONLY) != 0);
2324 XVA_SET_RTN(xvap, XAT_READONLY);
2327 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
2329 ((zp->z_pflags & ZFS_SYSTEM) != 0);
2330 XVA_SET_RTN(xvap, XAT_SYSTEM);
2333 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
2335 ((zp->z_pflags & ZFS_HIDDEN) != 0);
2336 XVA_SET_RTN(xvap, XAT_HIDDEN);
2339 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2340 xoap->xoa_nounlink =
2341 ((zp->z_pflags & ZFS_NOUNLINK) != 0);
2342 XVA_SET_RTN(xvap, XAT_NOUNLINK);
2345 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2346 xoap->xoa_immutable =
2347 ((zp->z_pflags & ZFS_IMMUTABLE) != 0);
2348 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
2351 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2352 xoap->xoa_appendonly =
2353 ((zp->z_pflags & ZFS_APPENDONLY) != 0);
2354 XVA_SET_RTN(xvap, XAT_APPENDONLY);
2357 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2359 ((zp->z_pflags & ZFS_NODUMP) != 0);
2360 XVA_SET_RTN(xvap, XAT_NODUMP);
2363 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
2365 ((zp->z_pflags & ZFS_OPAQUE) != 0);
2366 XVA_SET_RTN(xvap, XAT_OPAQUE);
2369 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2370 xoap->xoa_av_quarantined =
2371 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
2372 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
2375 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2376 xoap->xoa_av_modified =
2377 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
2378 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
2381 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
2382 S_ISREG(ip->i_mode)) {
2383 zfs_sa_get_scanstamp(zp, xvap);
2386 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
2389 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zsb),
2390 times, sizeof (times));
2391 ZFS_TIME_DECODE(&xoap->xoa_createtime, times);
2392 XVA_SET_RTN(xvap, XAT_CREATETIME);
2395 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2396 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
2397 XVA_SET_RTN(xvap, XAT_REPARSE);
2399 if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
2400 xoap->xoa_generation = ip->i_generation;
2401 XVA_SET_RTN(xvap, XAT_GEN);
2404 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
2406 ((zp->z_pflags & ZFS_OFFLINE) != 0);
2407 XVA_SET_RTN(xvap, XAT_OFFLINE);
2410 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
2412 ((zp->z_pflags & ZFS_SPARSE) != 0);
2413 XVA_SET_RTN(xvap, XAT_SPARSE);
2417 ZFS_TIME_DECODE(&vap->va_atime, atime);
2418 ZFS_TIME_DECODE(&vap->va_mtime, mtime);
2419 ZFS_TIME_DECODE(&vap->va_ctime, ctime);
2421 mutex_exit(&zp->z_lock);
2423 sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks);
2425 if (zp->z_blksz == 0) {
2427 * Block size hasn't been set; suggest maximal I/O transfers.
2429 vap->va_blksize = zsb->z_max_blksz;
2435 EXPORT_SYMBOL(zfs_getattr);
2438 * Get the basic file attributes and place them in the provided kstat
2439 * structure. The inode is assumed to be the authoritative source
2440 * for most of the attributes. However, the znode currently has the
2441 * authoritative atime, blksize, and block count.
2443 * IN: ip - inode of file.
2445 * OUT: sp - kstat values.
2447 * RETURN: 0 (always succeeds)
2451 zfs_getattr_fast(struct inode *ip, struct kstat *sp)
2453 znode_t *zp = ITOZ(ip);
2454 zfs_sb_t *zsb = ITOZSB(ip);
2456 u_longlong_t nblocks;
2461 mutex_enter(&zp->z_lock);
2463 generic_fillattr(ip, sp);
2465 sa_object_size(zp->z_sa_hdl, &blksize, &nblocks);
2466 sp->blksize = blksize;
2467 sp->blocks = nblocks;
2469 if (unlikely(zp->z_blksz == 0)) {
2471 * Block size hasn't been set; suggest maximal I/O transfers.
2473 sp->blksize = zsb->z_max_blksz;
2476 mutex_exit(&zp->z_lock);
2479 * Required to prevent NFS client from detecting different inode
2480 * numbers of snapshot root dentry before and after snapshot mount.
2482 if (zsb->z_issnap) {
2483 if (ip->i_sb->s_root->d_inode == ip)
2484 sp->ino = ZFSCTL_INO_SNAPDIRS -
2485 dmu_objset_id(zsb->z_os);
2492 EXPORT_SYMBOL(zfs_getattr_fast);
2495 * Set the file attributes to the values contained in the
2498 * IN: ip - inode of file to be modified.
2499 * vap - new attribute values.
2500 * If ATTR_XVATTR set, then optional attrs are being set
2501 * flags - ATTR_UTIME set if non-default time values provided.
2502 * - ATTR_NOACLCHECK (CIFS context only).
2503 * cr - credentials of caller.
2505 * RETURN: 0 if success
2506 * error code if failure
2509 * ip - ctime updated, mtime updated if size changed.
2513 zfs_setattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2515 znode_t *zp = ITOZ(ip);
2516 zfs_sb_t *zsb = ITOZSB(ip);
2520 xvattr_t *tmpxvattr;
2521 uint_t mask = vap->va_mask;
2522 uint_t saved_mask = 0;
2525 uint64_t new_uid, new_gid;
2527 uint64_t mtime[2], ctime[2], atime[2];
2529 int need_policy = FALSE;
2531 zfs_fuid_info_t *fuidp = NULL;
2532 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2535 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2536 boolean_t fuid_dirtied = B_FALSE;
2537 sa_bulk_attr_t *bulk, *xattr_bulk;
2538 int count = 0, xattr_count = 0;
2549 * Make sure that if we have ephemeral uid/gid or xvattr specified
2550 * that file system is at proper version level
2553 if (zsb->z_use_fuids == B_FALSE &&
2554 (((mask & ATTR_UID) && IS_EPHEMERAL(vap->va_uid)) ||
2555 ((mask & ATTR_GID) && IS_EPHEMERAL(vap->va_gid)) ||
2556 (mask & ATTR_XVATTR))) {
2558 return (SET_ERROR(EINVAL));
2561 if (mask & ATTR_SIZE && S_ISDIR(ip->i_mode)) {
2563 return (SET_ERROR(EISDIR));
2566 if (mask & ATTR_SIZE && !S_ISREG(ip->i_mode) && !S_ISFIFO(ip->i_mode)) {
2568 return (SET_ERROR(EINVAL));
2572 * If this is an xvattr_t, then get a pointer to the structure of
2573 * optional attributes. If this is NULL, then we have a vattr_t.
2575 xoap = xva_getxoptattr(xvap);
2577 tmpxvattr = kmem_alloc(sizeof (xvattr_t), KM_SLEEP);
2578 xva_init(tmpxvattr);
2580 bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * 7, KM_SLEEP);
2581 xattr_bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * 7, KM_SLEEP);
2584 * Immutable files can only alter immutable bit and atime
2586 if ((zp->z_pflags & ZFS_IMMUTABLE) &&
2587 ((mask & (ATTR_SIZE|ATTR_UID|ATTR_GID|ATTR_MTIME|ATTR_MODE)) ||
2588 ((mask & ATTR_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
2593 if ((mask & ATTR_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
2599 * Verify timestamps doesn't overflow 32 bits.
2600 * ZFS can handle large timestamps, but 32bit syscalls can't
2601 * handle times greater than 2039. This check should be removed
2602 * once large timestamps are fully supported.
2604 if (mask & (ATTR_ATIME | ATTR_MTIME)) {
2605 if (((mask & ATTR_ATIME) &&
2606 TIMESPEC_OVERFLOW(&vap->va_atime)) ||
2607 ((mask & ATTR_MTIME) &&
2608 TIMESPEC_OVERFLOW(&vap->va_mtime))) {
2618 /* Can this be moved to before the top label? */
2619 if (zfs_is_readonly(zsb)) {
2625 * First validate permissions
2628 if (mask & ATTR_SIZE) {
2629 err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
2634 * XXX - Note, we are not providing any open
2635 * mode flags here (like FNDELAY), so we may
2636 * block if there are locks present... this
2637 * should be addressed in openat().
2639 /* XXX - would it be OK to generate a log record here? */
2640 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
2645 if (mask & (ATTR_ATIME|ATTR_MTIME) ||
2646 ((mask & ATTR_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) ||
2647 XVA_ISSET_REQ(xvap, XAT_READONLY) ||
2648 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) ||
2649 XVA_ISSET_REQ(xvap, XAT_OFFLINE) ||
2650 XVA_ISSET_REQ(xvap, XAT_SPARSE) ||
2651 XVA_ISSET_REQ(xvap, XAT_CREATETIME) ||
2652 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
2653 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
2657 if (mask & (ATTR_UID|ATTR_GID)) {
2658 int idmask = (mask & (ATTR_UID|ATTR_GID));
2663 * NOTE: even if a new mode is being set,
2664 * we may clear S_ISUID/S_ISGID bits.
2667 if (!(mask & ATTR_MODE))
2668 vap->va_mode = zp->z_mode;
2671 * Take ownership or chgrp to group we are a member of
2674 take_owner = (mask & ATTR_UID) && (vap->va_uid == crgetuid(cr));
2675 take_group = (mask & ATTR_GID) &&
2676 zfs_groupmember(zsb, vap->va_gid, cr);
2679 * If both ATTR_UID and ATTR_GID are set then take_owner and
2680 * take_group must both be set in order to allow taking
2683 * Otherwise, send the check through secpolicy_vnode_setattr()
2687 if (((idmask == (ATTR_UID|ATTR_GID)) &&
2688 take_owner && take_group) ||
2689 ((idmask == ATTR_UID) && take_owner) ||
2690 ((idmask == ATTR_GID) && take_group)) {
2691 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
2692 skipaclchk, cr) == 0) {
2694 * Remove setuid/setgid for non-privileged users
2696 (void) secpolicy_setid_clear(vap, cr);
2697 trim_mask = (mask & (ATTR_UID|ATTR_GID));
2706 mutex_enter(&zp->z_lock);
2707 oldva.va_mode = zp->z_mode;
2708 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
2709 if (mask & ATTR_XVATTR) {
2711 * Update xvattr mask to include only those attributes
2712 * that are actually changing.
2714 * the bits will be restored prior to actually setting
2715 * the attributes so the caller thinks they were set.
2717 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2718 if (xoap->xoa_appendonly !=
2719 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
2722 XVA_CLR_REQ(xvap, XAT_APPENDONLY);
2723 XVA_SET_REQ(tmpxvattr, XAT_APPENDONLY);
2727 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2728 if (xoap->xoa_nounlink !=
2729 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
2732 XVA_CLR_REQ(xvap, XAT_NOUNLINK);
2733 XVA_SET_REQ(tmpxvattr, XAT_NOUNLINK);
2737 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2738 if (xoap->xoa_immutable !=
2739 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
2742 XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
2743 XVA_SET_REQ(tmpxvattr, XAT_IMMUTABLE);
2747 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2748 if (xoap->xoa_nodump !=
2749 ((zp->z_pflags & ZFS_NODUMP) != 0)) {
2752 XVA_CLR_REQ(xvap, XAT_NODUMP);
2753 XVA_SET_REQ(tmpxvattr, XAT_NODUMP);
2757 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2758 if (xoap->xoa_av_modified !=
2759 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
2762 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
2763 XVA_SET_REQ(tmpxvattr, XAT_AV_MODIFIED);
2767 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2768 if ((!S_ISREG(ip->i_mode) &&
2769 xoap->xoa_av_quarantined) ||
2770 xoap->xoa_av_quarantined !=
2771 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
2774 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
2775 XVA_SET_REQ(tmpxvattr, XAT_AV_QUARANTINED);
2779 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2780 mutex_exit(&zp->z_lock);
2785 if (need_policy == FALSE &&
2786 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) ||
2787 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
2792 mutex_exit(&zp->z_lock);
2794 if (mask & ATTR_MODE) {
2795 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
2796 err = secpolicy_setid_setsticky_clear(ip, vap,
2801 trim_mask |= ATTR_MODE;
2809 * If trim_mask is set then take ownership
2810 * has been granted or write_acl is present and user
2811 * has the ability to modify mode. In that case remove
2812 * UID|GID and or MODE from mask so that
2813 * secpolicy_vnode_setattr() doesn't revoke it.
2817 saved_mask = vap->va_mask;
2818 vap->va_mask &= ~trim_mask;
2820 err = secpolicy_vnode_setattr(cr, ip, vap, &oldva, flags,
2821 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
2826 vap->va_mask |= saved_mask;
2830 * secpolicy_vnode_setattr, or take ownership may have
2833 mask = vap->va_mask;
2835 if ((mask & (ATTR_UID | ATTR_GID))) {
2836 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zsb),
2837 &xattr_obj, sizeof (xattr_obj));
2839 if (err == 0 && xattr_obj) {
2840 err = zfs_zget(ZTOZSB(zp), xattr_obj, &attrzp);
2844 if (mask & ATTR_UID) {
2845 new_uid = zfs_fuid_create(zsb,
2846 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
2847 if (new_uid != zp->z_uid &&
2848 zfs_fuid_overquota(zsb, B_FALSE, new_uid)) {
2856 if (mask & ATTR_GID) {
2857 new_gid = zfs_fuid_create(zsb, (uint64_t)vap->va_gid,
2858 cr, ZFS_GROUP, &fuidp);
2859 if (new_gid != zp->z_gid &&
2860 zfs_fuid_overquota(zsb, B_TRUE, new_gid)) {
2868 tx = dmu_tx_create(zsb->z_os);
2870 if (mask & ATTR_MODE) {
2871 uint64_t pmode = zp->z_mode;
2873 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
2875 zfs_acl_chmod_setattr(zp, &aclp, new_mode);
2877 mutex_enter(&zp->z_lock);
2878 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
2880 * Are we upgrading ACL from old V0 format
2883 if (zsb->z_version >= ZPL_VERSION_FUID &&
2884 zfs_znode_acl_version(zp) ==
2885 ZFS_ACL_VERSION_INITIAL) {
2886 dmu_tx_hold_free(tx, acl_obj, 0,
2888 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
2889 0, aclp->z_acl_bytes);
2891 dmu_tx_hold_write(tx, acl_obj, 0,
2894 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
2895 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
2896 0, aclp->z_acl_bytes);
2898 mutex_exit(&zp->z_lock);
2899 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2901 if ((mask & ATTR_XVATTR) &&
2902 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
2903 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2905 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2909 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
2912 fuid_dirtied = zsb->z_fuid_dirty;
2914 zfs_fuid_txhold(zsb, tx);
2916 zfs_sa_upgrade_txholds(tx, zp);
2918 err = dmu_tx_assign(tx, TXG_WAIT);
2924 * Set each attribute requested.
2925 * We group settings according to the locks they need to acquire.
2927 * Note: you cannot set ctime directly, although it will be
2928 * updated as a side-effect of calling this function.
2932 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
2933 mutex_enter(&zp->z_acl_lock);
2934 mutex_enter(&zp->z_lock);
2936 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
2937 &zp->z_pflags, sizeof (zp->z_pflags));
2940 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
2941 mutex_enter(&attrzp->z_acl_lock);
2942 mutex_enter(&attrzp->z_lock);
2943 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
2944 SA_ZPL_FLAGS(zsb), NULL, &attrzp->z_pflags,
2945 sizeof (attrzp->z_pflags));
2948 if (mask & (ATTR_UID|ATTR_GID)) {
2950 if (mask & ATTR_UID) {
2951 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zsb), NULL,
2952 &new_uid, sizeof (new_uid));
2953 zp->z_uid = new_uid;
2955 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
2956 SA_ZPL_UID(zsb), NULL, &new_uid,
2958 attrzp->z_uid = new_uid;
2962 if (mask & ATTR_GID) {
2963 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zsb),
2964 NULL, &new_gid, sizeof (new_gid));
2965 zp->z_gid = new_gid;
2967 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
2968 SA_ZPL_GID(zsb), NULL, &new_gid,
2970 attrzp->z_gid = new_gid;
2973 if (!(mask & ATTR_MODE)) {
2974 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb),
2975 NULL, &new_mode, sizeof (new_mode));
2976 new_mode = zp->z_mode;
2978 err = zfs_acl_chown_setattr(zp);
2981 err = zfs_acl_chown_setattr(attrzp);
2986 if (mask & ATTR_MODE) {
2987 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb), NULL,
2988 &new_mode, sizeof (new_mode));
2989 zp->z_mode = new_mode;
2990 ASSERT3P(aclp, !=, NULL);
2991 err = zfs_aclset_common(zp, aclp, cr, tx);
2993 if (zp->z_acl_cached)
2994 zfs_acl_free(zp->z_acl_cached);
2995 zp->z_acl_cached = aclp;
3000 if ((mask & ATTR_ATIME) || zp->z_atime_dirty) {
3001 zp->z_atime_dirty = 0;
3002 ZFS_TIME_ENCODE(&ip->i_atime, atime);
3003 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zsb), NULL,
3004 &atime, sizeof (atime));
3007 if (mask & ATTR_MTIME) {
3008 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
3009 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL,
3010 mtime, sizeof (mtime));
3013 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
3014 if (mask & ATTR_SIZE && !(mask & ATTR_MTIME)) {
3015 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb),
3016 NULL, mtime, sizeof (mtime));
3017 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
3018 &ctime, sizeof (ctime));
3019 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
3020 } else if (mask != 0) {
3021 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
3022 &ctime, sizeof (ctime));
3023 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime);
3025 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3026 SA_ZPL_CTIME(zsb), NULL,
3027 &ctime, sizeof (ctime));
3028 zfs_tstamp_update_setup(attrzp, STATE_CHANGED,
3033 * Do this after setting timestamps to prevent timestamp
3034 * update from toggling bit
3037 if (xoap && (mask & ATTR_XVATTR)) {
3040 * restore trimmed off masks
3041 * so that return masks can be set for caller.
3044 if (XVA_ISSET_REQ(tmpxvattr, XAT_APPENDONLY)) {
3045 XVA_SET_REQ(xvap, XAT_APPENDONLY);
3047 if (XVA_ISSET_REQ(tmpxvattr, XAT_NOUNLINK)) {
3048 XVA_SET_REQ(xvap, XAT_NOUNLINK);
3050 if (XVA_ISSET_REQ(tmpxvattr, XAT_IMMUTABLE)) {
3051 XVA_SET_REQ(xvap, XAT_IMMUTABLE);
3053 if (XVA_ISSET_REQ(tmpxvattr, XAT_NODUMP)) {
3054 XVA_SET_REQ(xvap, XAT_NODUMP);
3056 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_MODIFIED)) {
3057 XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
3059 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_QUARANTINED)) {
3060 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
3063 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3064 ASSERT(S_ISREG(ip->i_mode));
3066 zfs_xvattr_set(zp, xvap, tx);
3070 zfs_fuid_sync(zsb, tx);
3073 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);
3075 mutex_exit(&zp->z_lock);
3076 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3077 mutex_exit(&zp->z_acl_lock);
3080 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3081 mutex_exit(&attrzp->z_acl_lock);
3082 mutex_exit(&attrzp->z_lock);
3085 if (err == 0 && attrzp) {
3086 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
3097 zfs_fuid_info_free(fuidp);
3103 if (err == ERESTART)
3106 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
3108 zfs_inode_update(zp);
3112 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3113 zil_commit(zilog, 0);
3116 kmem_free(xattr_bulk, sizeof (sa_bulk_attr_t) * 7);
3117 kmem_free(bulk, sizeof (sa_bulk_attr_t) * 7);
3118 kmem_free(tmpxvattr, sizeof (xvattr_t));
3122 EXPORT_SYMBOL(zfs_setattr);
3124 typedef struct zfs_zlock {
3125 krwlock_t *zl_rwlock; /* lock we acquired */
3126 znode_t *zl_znode; /* znode we held */
3127 struct zfs_zlock *zl_next; /* next in list */
3131 * Drop locks and release vnodes that were held by zfs_rename_lock().
3134 zfs_rename_unlock(zfs_zlock_t **zlpp)
3138 while ((zl = *zlpp) != NULL) {
3139 if (zl->zl_znode != NULL)
3140 iput(ZTOI(zl->zl_znode));
3141 rw_exit(zl->zl_rwlock);
3142 *zlpp = zl->zl_next;
3143 kmem_free(zl, sizeof (*zl));
3148 * Search back through the directory tree, using the ".." entries.
3149 * Lock each directory in the chain to prevent concurrent renames.
3150 * Fail any attempt to move a directory into one of its own descendants.
3151 * XXX - z_parent_lock can overlap with map or grow locks
3154 zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp)
3158 uint64_t rootid = ZTOZSB(zp)->z_root;
3159 uint64_t oidp = zp->z_id;
3160 krwlock_t *rwlp = &szp->z_parent_lock;
3161 krw_t rw = RW_WRITER;
3164 * First pass write-locks szp and compares to zp->z_id.
3165 * Later passes read-lock zp and compare to zp->z_parent.
3168 if (!rw_tryenter(rwlp, rw)) {
3170 * Another thread is renaming in this path.
3171 * Note that if we are a WRITER, we don't have any
3172 * parent_locks held yet.
3174 if (rw == RW_READER && zp->z_id > szp->z_id) {
3176 * Drop our locks and restart
3178 zfs_rename_unlock(&zl);
3182 rwlp = &szp->z_parent_lock;
3187 * Wait for other thread to drop its locks
3193 zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
3194 zl->zl_rwlock = rwlp;
3195 zl->zl_znode = NULL;
3196 zl->zl_next = *zlpp;
3199 if (oidp == szp->z_id) /* We're a descendant of szp */
3200 return (SET_ERROR(EINVAL));
3202 if (oidp == rootid) /* We've hit the top */
3205 if (rw == RW_READER) { /* i.e. not the first pass */
3206 int error = zfs_zget(ZTOZSB(zp), oidp, &zp);
3211 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(ZTOZSB(zp)),
3212 &oidp, sizeof (oidp));
3213 rwlp = &zp->z_parent_lock;
3216 } while (zp->z_id != sdzp->z_id);
3222 * Move an entry from the provided source directory to the target
3223 * directory. Change the entry name as indicated.
3225 * IN: sdip - Source directory containing the "old entry".
3226 * snm - Old entry name.
3227 * tdip - Target directory to contain the "new entry".
3228 * tnm - New entry name.
3229 * cr - credentials of caller.
3230 * flags - case flags
3232 * RETURN: 0 on success, error code on failure.
3235 * sdip,tdip - ctime|mtime updated
3239 zfs_rename(struct inode *sdip, char *snm, struct inode *tdip, char *tnm,
3240 cred_t *cr, int flags)
3242 znode_t *tdzp, *szp, *tzp;
3243 znode_t *sdzp = ITOZ(sdip);
3244 zfs_sb_t *zsb = ITOZSB(sdip);
3246 zfs_dirlock_t *sdl, *tdl;
3249 int cmp, serr, terr;
3252 boolean_t waited = B_FALSE;
3255 ZFS_VERIFY_ZP(sdzp);
3259 ZFS_VERIFY_ZP(tdzp);
3262 * We check i_sb because snapshots and the ctldir must have different
3265 if (tdip->i_sb != sdip->i_sb || zfsctl_is_node(tdip)) {
3267 return (SET_ERROR(EXDEV));
3270 if (zsb->z_utf8 && u8_validate(tnm,
3271 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3273 return (SET_ERROR(EILSEQ));
3276 if (flags & FIGNORECASE)
3285 * This is to prevent the creation of links into attribute space
3286 * by renaming a linked file into/outof an attribute directory.
3287 * See the comment in zfs_link() for why this is considered bad.
3289 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
3291 return (SET_ERROR(EINVAL));
3295 * Lock source and target directory entries. To prevent deadlock,
3296 * a lock ordering must be defined. We lock the directory with
3297 * the smallest object id first, or if it's a tie, the one with
3298 * the lexically first name.
3300 if (sdzp->z_id < tdzp->z_id) {
3302 } else if (sdzp->z_id > tdzp->z_id) {
3306 * First compare the two name arguments without
3307 * considering any case folding.
3309 int nofold = (zsb->z_norm & ~U8_TEXTPREP_TOUPPER);
3311 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
3312 ASSERT(error == 0 || !zsb->z_utf8);
3315 * POSIX: "If the old argument and the new argument
3316 * both refer to links to the same existing file,
3317 * the rename() function shall return successfully
3318 * and perform no other action."
3324 * If the file system is case-folding, then we may
3325 * have some more checking to do. A case-folding file
3326 * system is either supporting mixed case sensitivity
3327 * access or is completely case-insensitive. Note
3328 * that the file system is always case preserving.
3330 * In mixed sensitivity mode case sensitive behavior
3331 * is the default. FIGNORECASE must be used to
3332 * explicitly request case insensitive behavior.
3334 * If the source and target names provided differ only
3335 * by case (e.g., a request to rename 'tim' to 'Tim'),
3336 * we will treat this as a special case in the
3337 * case-insensitive mode: as long as the source name
3338 * is an exact match, we will allow this to proceed as
3339 * a name-change request.
3341 if ((zsb->z_case == ZFS_CASE_INSENSITIVE ||
3342 (zsb->z_case == ZFS_CASE_MIXED &&
3343 flags & FIGNORECASE)) &&
3344 u8_strcmp(snm, tnm, 0, zsb->z_norm, U8_UNICODE_LATEST,
3347 * case preserving rename request, require exact
3356 * If the source and destination directories are the same, we should
3357 * grab the z_name_lock of that directory only once.
3361 rw_enter(&sdzp->z_name_lock, RW_READER);
3365 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
3366 ZEXISTS | zflg, NULL, NULL);
3367 terr = zfs_dirent_lock(&tdl,
3368 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL);
3370 terr = zfs_dirent_lock(&tdl,
3371 tdzp, tnm, &tzp, zflg, NULL, NULL);
3372 serr = zfs_dirent_lock(&sdl,
3373 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg,
3379 * Source entry invalid or not there.
3382 zfs_dirent_unlock(tdl);
3388 rw_exit(&sdzp->z_name_lock);
3390 if (strcmp(snm, "..") == 0)
3396 zfs_dirent_unlock(sdl);
3400 rw_exit(&sdzp->z_name_lock);
3402 if (strcmp(tnm, "..") == 0)
3409 * Must have write access at the source to remove the old entry
3410 * and write access at the target to create the new entry.
3411 * Note that if target and source are the same, this can be
3412 * done in a single check.
3415 if ((error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)))
3418 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3420 * Check to make sure rename is valid.
3421 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3423 if ((error = zfs_rename_lock(szp, tdzp, sdzp, &zl)))
3428 * Does target exist?
3432 * Source and target must be the same type.
3434 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3435 if (!S_ISDIR(ZTOI(tzp)->i_mode)) {
3436 error = SET_ERROR(ENOTDIR);
3440 if (S_ISDIR(ZTOI(tzp)->i_mode)) {
3441 error = SET_ERROR(EISDIR);
3446 * POSIX dictates that when the source and target
3447 * entries refer to the same file object, rename
3448 * must do nothing and exit without error.
3450 if (szp->z_id == tzp->z_id) {
3456 tx = dmu_tx_create(zsb->z_os);
3457 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3458 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
3459 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
3460 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
3462 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
3463 zfs_sa_upgrade_txholds(tx, tdzp);
3466 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
3467 zfs_sa_upgrade_txholds(tx, tzp);
3470 zfs_sa_upgrade_txholds(tx, szp);
3471 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
3472 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3475 zfs_rename_unlock(&zl);
3476 zfs_dirent_unlock(sdl);
3477 zfs_dirent_unlock(tdl);
3480 rw_exit(&sdzp->z_name_lock);
3485 if (error == ERESTART) {
3496 if (tzp) /* Attempt to remove the existing target */
3497 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
3500 error = zfs_link_create(tdl, szp, tx, ZRENAMING);
3502 szp->z_pflags |= ZFS_AV_MODIFIED;
3504 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zsb),
3505 (void *)&szp->z_pflags, sizeof (uint64_t), tx);
3508 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
3510 zfs_log_rename(zilog, tx, TX_RENAME |
3511 (flags & FIGNORECASE ? TX_CI : 0), sdzp,
3512 sdl->dl_name, tdzp, tdl->dl_name, szp);
3515 * At this point, we have successfully created
3516 * the target name, but have failed to remove
3517 * the source name. Since the create was done
3518 * with the ZRENAMING flag, there are
3519 * complications; for one, the link count is
3520 * wrong. The easiest way to deal with this
3521 * is to remove the newly created target, and
3522 * return the original error. This must
3523 * succeed; fortunately, it is very unlikely to
3524 * fail, since we just created it.
3526 VERIFY3U(zfs_link_destroy(tdl, szp, tx,
3527 ZRENAMING, NULL), ==, 0);
3535 zfs_rename_unlock(&zl);
3537 zfs_dirent_unlock(sdl);
3538 zfs_dirent_unlock(tdl);
3540 zfs_inode_update(sdzp);
3542 rw_exit(&sdzp->z_name_lock);
3545 zfs_inode_update(tdzp);
3547 zfs_inode_update(szp);
3550 zfs_inode_update(tzp);
3554 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3555 zil_commit(zilog, 0);
3560 EXPORT_SYMBOL(zfs_rename);
3563 * Insert the indicated symbolic reference entry into the directory.
3565 * IN: dip - Directory to contain new symbolic link.
3566 * link - Name for new symlink entry.
3567 * vap - Attributes of new entry.
3568 * target - Target path of new symlink.
3570 * cr - credentials of caller.
3571 * flags - case flags
3573 * RETURN: 0 on success, error code on failure.
3576 * dip - ctime|mtime updated
3580 zfs_symlink(struct inode *dip, char *name, vattr_t *vap, char *link,
3581 struct inode **ipp, cred_t *cr, int flags)
3583 znode_t *zp, *dzp = ITOZ(dip);
3586 zfs_sb_t *zsb = ITOZSB(dip);
3588 uint64_t len = strlen(link);
3591 zfs_acl_ids_t acl_ids;
3592 boolean_t fuid_dirtied;
3593 uint64_t txtype = TX_SYMLINK;
3594 boolean_t waited = B_FALSE;
3596 ASSERT(S_ISLNK(vap->va_mode));
3602 if (zsb->z_utf8 && u8_validate(name, strlen(name),
3603 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3605 return (SET_ERROR(EILSEQ));
3607 if (flags & FIGNORECASE)
3610 if (len > MAXPATHLEN) {
3612 return (SET_ERROR(ENAMETOOLONG));
3615 if ((error = zfs_acl_ids_create(dzp, 0,
3616 vap, cr, NULL, &acl_ids)) != 0) {
3624 * Attempt to lock directory; fail if entry already exists.
3626 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
3628 zfs_acl_ids_free(&acl_ids);
3633 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
3634 zfs_acl_ids_free(&acl_ids);
3635 zfs_dirent_unlock(dl);
3640 if (zfs_acl_ids_overquota(zsb, &acl_ids)) {
3641 zfs_acl_ids_free(&acl_ids);
3642 zfs_dirent_unlock(dl);
3644 return (SET_ERROR(EDQUOT));
3646 tx = dmu_tx_create(zsb->z_os);
3647 fuid_dirtied = zsb->z_fuid_dirty;
3648 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
3649 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
3650 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
3651 ZFS_SA_BASE_ATTR_SIZE + len);
3652 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
3653 if (!zsb->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3654 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
3655 acl_ids.z_aclp->z_acl_bytes);
3658 zfs_fuid_txhold(zsb, tx);
3659 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3661 zfs_dirent_unlock(dl);
3662 if (error == ERESTART) {
3668 zfs_acl_ids_free(&acl_ids);
3675 * Create a new object for the symlink.
3676 * for version 4 ZPL datsets the symlink will be an SA attribute
3678 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
3681 zfs_fuid_sync(zsb, tx);
3683 mutex_enter(&zp->z_lock);
3685 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zsb),
3688 zfs_sa_symlink(zp, link, len, tx);
3689 mutex_exit(&zp->z_lock);
3692 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zsb),
3693 &zp->z_size, sizeof (zp->z_size), tx);
3695 * Insert the new object into the directory.
3697 (void) zfs_link_create(dl, zp, tx, ZNEW);
3699 if (flags & FIGNORECASE)
3701 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
3703 zfs_inode_update(dzp);
3704 zfs_inode_update(zp);
3706 zfs_acl_ids_free(&acl_ids);
3710 zfs_dirent_unlock(dl);
3714 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3715 zil_commit(zilog, 0);
3720 EXPORT_SYMBOL(zfs_symlink);
3723 * Return, in the buffer contained in the provided uio structure,
3724 * the symbolic path referred to by ip.
3726 * IN: ip - inode of symbolic link
3727 * uio - structure to contain the link path.
3728 * cr - credentials of caller.
3730 * RETURN: 0 if success
3731 * error code if failure
3734 * ip - atime updated
3738 zfs_readlink(struct inode *ip, uio_t *uio, cred_t *cr)
3740 znode_t *zp = ITOZ(ip);
3741 zfs_sb_t *zsb = ITOZSB(ip);
3747 mutex_enter(&zp->z_lock);
3749 error = sa_lookup_uio(zp->z_sa_hdl,
3750 SA_ZPL_SYMLINK(zsb), uio);
3752 error = zfs_sa_readlink(zp, uio);
3753 mutex_exit(&zp->z_lock);
3758 EXPORT_SYMBOL(zfs_readlink);
3761 * Insert a new entry into directory tdip referencing sip.
3763 * IN: tdip - Directory to contain new entry.
3764 * sip - inode of new entry.
3765 * name - name of new entry.
3766 * cr - credentials of caller.
3768 * RETURN: 0 if success
3769 * error code if failure
3772 * tdip - ctime|mtime updated
3773 * sip - ctime updated
3777 zfs_link(struct inode *tdip, struct inode *sip, char *name, cred_t *cr,
3780 znode_t *dzp = ITOZ(tdip);
3782 zfs_sb_t *zsb = ITOZSB(tdip);
3790 boolean_t waited = B_FALSE;
3792 ASSERT(S_ISDIR(tdip->i_mode));
3799 * POSIX dictates that we return EPERM here.
3800 * Better choices include ENOTSUP or EISDIR.
3802 if (S_ISDIR(sip->i_mode)) {
3804 return (SET_ERROR(EPERM));
3811 * We check i_sb because snapshots and the ctldir must have different
3814 if (sip->i_sb != tdip->i_sb || zfsctl_is_node(sip)) {
3816 return (SET_ERROR(EXDEV));
3819 /* Prevent links to .zfs/shares files */
3821 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zsb),
3822 &parent, sizeof (uint64_t))) != 0) {
3826 if (parent == zsb->z_shares_dir) {
3828 return (SET_ERROR(EPERM));
3831 if (zsb->z_utf8 && u8_validate(name,
3832 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3834 return (SET_ERROR(EILSEQ));
3836 if (flags & FIGNORECASE)
3840 * We do not support links between attributes and non-attributes
3841 * because of the potential security risk of creating links
3842 * into "normal" file space in order to circumvent restrictions
3843 * imposed in attribute space.
3845 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) {
3847 return (SET_ERROR(EINVAL));
3850 owner = zfs_fuid_map_id(zsb, szp->z_uid, cr, ZFS_OWNER);
3851 if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
3853 return (SET_ERROR(EPERM));
3856 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
3863 * Attempt to lock directory; fail if entry already exists.
3865 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL);
3871 tx = dmu_tx_create(zsb->z_os);
3872 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3873 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
3874 zfs_sa_upgrade_txholds(tx, szp);
3875 zfs_sa_upgrade_txholds(tx, dzp);
3876 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3878 zfs_dirent_unlock(dl);
3879 if (error == ERESTART) {
3890 error = zfs_link_create(dl, szp, tx, 0);
3893 uint64_t txtype = TX_LINK;
3894 if (flags & FIGNORECASE)
3896 zfs_log_link(zilog, tx, txtype, dzp, szp, name);
3901 zfs_dirent_unlock(dl);
3903 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3904 zil_commit(zilog, 0);
3906 zfs_inode_update(dzp);
3907 zfs_inode_update(szp);
3911 EXPORT_SYMBOL(zfs_link);
3914 zfs_putpage_commit_cb(void *arg)
3916 struct page *pp = arg;
3919 end_page_writeback(pp);
3923 * Push a page out to disk, once the page is on stable storage the
3924 * registered commit callback will be run as notification of completion.
3926 * IN: ip - page mapped for inode.
3927 * pp - page to push (page is locked)
3928 * wbc - writeback control data
3930 * RETURN: 0 if success
3931 * error code if failure
3934 * ip - ctime|mtime updated
3938 zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc)
3940 znode_t *zp = ITOZ(ip);
3941 zfs_sb_t *zsb = ITOZSB(ip);
3949 uint64_t mtime[2], ctime[2];
3950 sa_bulk_attr_t bulk[3];
3952 struct address_space *mapping;
3957 ASSERT(PageLocked(pp));
3959 pgoff = page_offset(pp); /* Page byte-offset in file */
3960 offset = i_size_read(ip); /* File length in bytes */
3961 pglen = MIN(PAGE_SIZE, /* Page length in bytes */
3962 P2ROUNDUP(offset, PAGE_SIZE)-pgoff);
3964 /* Page is beyond end of file */
3965 if (pgoff >= offset) {
3971 /* Truncate page length to end of file */
3972 if (pgoff + pglen > offset)
3973 pglen = offset - pgoff;
3977 * FIXME: Allow mmap writes past its quota. The correct fix
3978 * is to register a page_mkwrite() handler to count the page
3979 * against its quota when it is about to be dirtied.
3981 if (zfs_owner_overquota(zsb, zp, B_FALSE) ||
3982 zfs_owner_overquota(zsb, zp, B_TRUE)) {
3988 * The ordering here is critical and must adhere to the following
3989 * rules in order to avoid deadlocking in either zfs_read() or
3990 * zfs_free_range() due to a lock inversion.
3992 * 1) The page must be unlocked prior to acquiring the range lock.
3993 * This is critical because zfs_read() calls find_lock_page()
3994 * which may block on the page lock while holding the range lock.
3996 * 2) Before setting or clearing write back on a page the range lock
3997 * must be held in order to prevent a lock inversion with the
3998 * zfs_free_range() function.
4000 * This presents a problem because upon entering this function the
4001 * page lock is already held. To safely acquire the range lock the
4002 * page lock must be dropped. This creates a window where another
4003 * process could truncate, invalidate, dirty, or write out the page.
4005 * Therefore, after successfully reacquiring the range and page locks
4006 * the current page state is checked. In the common case everything
4007 * will be as is expected and it can be written out. However, if
4008 * the page state has changed it must be handled accordingly.
4010 mapping = pp->mapping;
4011 redirty_page_for_writepage(wbc, pp);
4014 rl = zfs_range_lock(&zp->z_range_lock, pgoff, pglen, RL_WRITER);
4017 /* Page mapping changed or it was no longer dirty, we're done */
4018 if (unlikely((mapping != pp->mapping) || !PageDirty(pp))) {
4020 zfs_range_unlock(rl);
4025 /* Another process started write block if required */
4026 if (PageWriteback(pp)) {
4028 zfs_range_unlock(rl);
4030 if (wbc->sync_mode != WB_SYNC_NONE)
4031 wait_on_page_writeback(pp);
4037 /* Clear the dirty flag the required locks are held */
4038 if (!clear_page_dirty_for_io(pp)) {
4040 zfs_range_unlock(rl);
4046 * Counterpart for redirty_page_for_writepage() above. This page
4047 * was in fact not skipped and should not be counted as if it were.
4049 wbc->pages_skipped--;
4050 set_page_writeback(pp);
4053 tx = dmu_tx_create(zsb->z_os);
4054 dmu_tx_hold_write(tx, zp->z_id, pgoff, pglen);
4055 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4056 zfs_sa_upgrade_txholds(tx, zp);
4058 err = dmu_tx_assign(tx, TXG_NOWAIT);
4060 if (err == ERESTART)
4064 __set_page_dirty_nobuffers(pp);
4066 end_page_writeback(pp);
4067 zfs_range_unlock(rl);
4073 ASSERT3U(pglen, <=, PAGE_SIZE);
4074 dmu_write(zsb->z_os, zp->z_id, pgoff, pglen, va, tx);
4077 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
4078 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
4079 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_FLAGS(zsb), NULL, &zp->z_pflags, 8);
4081 /* Preserve the mtime and ctime provided by the inode */
4082 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4083 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4084 zp->z_atime_dirty = 0;
4087 err = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4089 zfs_log_write(zsb->z_log, tx, TX_WRITE, zp, pgoff, pglen, 0,
4090 zfs_putpage_commit_cb, pp);
4093 zfs_range_unlock(rl);
4095 if (wbc->sync_mode != WB_SYNC_NONE) {
4097 * Note that this is rarely called under writepages(), because
4098 * writepages() normally handles the entire commit for
4099 * performance reasons.
4101 if (zsb->z_log != NULL)
4102 zil_commit(zsb->z_log, zp->z_id);
4110 * Update the system attributes when the inode has been dirtied. For the
4111 * moment we only update the mode, atime, mtime, and ctime.
4114 zfs_dirty_inode(struct inode *ip, int flags)
4116 znode_t *zp = ITOZ(ip);
4117 zfs_sb_t *zsb = ITOZSB(ip);
4119 uint64_t mode, atime[2], mtime[2], ctime[2];
4120 sa_bulk_attr_t bulk[4];
4124 if (zfs_is_readonly(zsb) || dmu_objset_is_snapshot(zsb->z_os))
4132 * This is the lazytime semantic indroduced in Linux 4.0
4133 * This flag will only be called from update_time when lazytime is set.
4134 * (Note, I_DIRTY_SYNC will also set if not lazytime)
4135 * Fortunately mtime and ctime are managed within ZFS itself, so we
4136 * only need to dirty atime.
4138 if (flags == I_DIRTY_TIME) {
4139 zp->z_atime_dirty = 1;
4144 tx = dmu_tx_create(zsb->z_os);
4146 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4147 zfs_sa_upgrade_txholds(tx, zp);
4149 error = dmu_tx_assign(tx, TXG_WAIT);
4155 mutex_enter(&zp->z_lock);
4156 zp->z_atime_dirty = 0;
4158 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MODE(zsb), NULL, &mode, 8);
4159 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_ATIME(zsb), NULL, &atime, 16);
4160 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
4161 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
4163 /* Preserve the mode, mtime and ctime provided by the inode */
4164 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4165 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4166 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4171 error = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4172 mutex_exit(&zp->z_lock);
4179 EXPORT_SYMBOL(zfs_dirty_inode);
4183 zfs_inactive(struct inode *ip)
4185 znode_t *zp = ITOZ(ip);
4186 zfs_sb_t *zsb = ITOZSB(ip);
4189 int need_unlock = 0;
4191 /* Only read lock if we haven't already write locked, e.g. rollback */
4192 if (!RW_WRITE_HELD(&zsb->z_teardown_inactive_lock)) {
4194 rw_enter(&zsb->z_teardown_inactive_lock, RW_READER);
4196 if (zp->z_sa_hdl == NULL) {
4198 rw_exit(&zsb->z_teardown_inactive_lock);
4202 if (zp->z_atime_dirty && zp->z_unlinked == 0) {
4203 dmu_tx_t *tx = dmu_tx_create(zsb->z_os);
4205 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4206 zfs_sa_upgrade_txholds(tx, zp);
4207 error = dmu_tx_assign(tx, TXG_WAIT);
4211 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4212 mutex_enter(&zp->z_lock);
4213 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zsb),
4214 (void *)&atime, sizeof (atime), tx);
4215 zp->z_atime_dirty = 0;
4216 mutex_exit(&zp->z_lock);
4223 rw_exit(&zsb->z_teardown_inactive_lock);
4225 EXPORT_SYMBOL(zfs_inactive);
4228 * Bounds-check the seek operation.
4230 * IN: ip - inode seeking within
4231 * ooff - old file offset
4232 * noffp - pointer to new file offset
4233 * ct - caller context
4235 * RETURN: 0 if success
4236 * EINVAL if new offset invalid
4240 zfs_seek(struct inode *ip, offset_t ooff, offset_t *noffp)
4242 if (S_ISDIR(ip->i_mode))
4244 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
4246 EXPORT_SYMBOL(zfs_seek);
4249 * Fill pages with data from the disk.
4252 zfs_fillpage(struct inode *ip, struct page *pl[], int nr_pages)
4254 znode_t *zp = ITOZ(ip);
4255 zfs_sb_t *zsb = ITOZSB(ip);
4257 struct page *cur_pp;
4258 u_offset_t io_off, total;
4265 io_len = nr_pages << PAGE_SHIFT;
4266 i_size = i_size_read(ip);
4267 io_off = page_offset(pl[0]);
4269 if (io_off + io_len > i_size)
4270 io_len = i_size - io_off;
4273 * Iterate over list of pages and read each page individually.
4276 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
4279 cur_pp = pl[page_idx++];
4281 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
4285 /* convert checksum errors into IO errors */
4287 err = SET_ERROR(EIO);
4296 * Uses zfs_fillpage to read data from the file and fill the pages.
4298 * IN: ip - inode of file to get data from.
4299 * pl - list of pages to read
4300 * nr_pages - number of pages to read
4302 * RETURN: 0 on success, error code on failure.
4305 * vp - atime updated
4309 zfs_getpage(struct inode *ip, struct page *pl[], int nr_pages)
4311 znode_t *zp = ITOZ(ip);
4312 zfs_sb_t *zsb = ITOZSB(ip);
4321 err = zfs_fillpage(ip, pl, nr_pages);
4326 EXPORT_SYMBOL(zfs_getpage);
4329 * Check ZFS specific permissions to memory map a section of a file.
4331 * IN: ip - inode of the file to mmap
4333 * addrp - start address in memory region
4334 * len - length of memory region
4335 * vm_flags- address flags
4337 * RETURN: 0 if success
4338 * error code if failure
4342 zfs_map(struct inode *ip, offset_t off, caddr_t *addrp, size_t len,
4343 unsigned long vm_flags)
4345 znode_t *zp = ITOZ(ip);
4346 zfs_sb_t *zsb = ITOZSB(ip);
4351 if ((vm_flags & VM_WRITE) && (zp->z_pflags &
4352 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
4354 return (SET_ERROR(EPERM));
4357 if ((vm_flags & (VM_READ | VM_EXEC)) &&
4358 (zp->z_pflags & ZFS_AV_QUARANTINED)) {
4360 return (SET_ERROR(EACCES));
4363 if (off < 0 || len > MAXOFFSET_T - off) {
4365 return (SET_ERROR(ENXIO));
4371 EXPORT_SYMBOL(zfs_map);
4374 * convoff - converts the given data (start, whence) to the
4378 convoff(struct inode *ip, flock64_t *lckdat, int whence, offset_t offset)
4383 if ((lckdat->l_whence == 2) || (whence == 2)) {
4384 if ((error = zfs_getattr(ip, &vap, 0, CRED()) != 0))
4388 switch (lckdat->l_whence) {
4390 lckdat->l_start += offset;
4393 lckdat->l_start += vap.va_size;
4398 return (SET_ERROR(EINVAL));
4401 if (lckdat->l_start < 0)
4402 return (SET_ERROR(EINVAL));
4406 lckdat->l_start -= offset;
4409 lckdat->l_start -= vap.va_size;
4414 return (SET_ERROR(EINVAL));
4417 lckdat->l_whence = (short)whence;
4422 * Free or allocate space in a file. Currently, this function only
4423 * supports the `F_FREESP' command. However, this command is somewhat
4424 * misnamed, as its functionality includes the ability to allocate as
4425 * well as free space.
4427 * IN: ip - inode of file to free data in.
4428 * cmd - action to take (only F_FREESP supported).
4429 * bfp - section of file to free/alloc.
4430 * flag - current file open mode flags.
4431 * offset - current file offset.
4432 * cr - credentials of caller [UNUSED].
4434 * RETURN: 0 on success, error code on failure.
4437 * ip - ctime|mtime updated
4441 zfs_space(struct inode *ip, int cmd, flock64_t *bfp, int flag,
4442 offset_t offset, cred_t *cr)
4444 znode_t *zp = ITOZ(ip);
4445 zfs_sb_t *zsb = ITOZSB(ip);
4452 if (cmd != F_FREESP) {
4454 return (SET_ERROR(EINVAL));
4458 * Callers might not be able to detect properly that we are read-only,
4459 * so check it explicitly here.
4461 if (zfs_is_readonly(zsb)) {
4463 return (SET_ERROR(EROFS));
4466 if ((error = convoff(ip, bfp, 0, offset))) {
4471 if (bfp->l_len < 0) {
4473 return (SET_ERROR(EINVAL));
4477 * Permissions aren't checked on Solaris because on this OS
4478 * zfs_space() can only be called with an opened file handle.
4479 * On Linux we can get here through truncate_range() which
4480 * operates directly on inodes, so we need to check access rights.
4482 if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr))) {
4488 len = bfp->l_len; /* 0 means from off to end of file */
4490 error = zfs_freesp(zp, off, len, flag, TRUE);
4495 EXPORT_SYMBOL(zfs_space);
4499 zfs_fid(struct inode *ip, fid_t *fidp)
4501 znode_t *zp = ITOZ(ip);
4502 zfs_sb_t *zsb = ITOZSB(ip);
4505 uint64_t object = zp->z_id;
4512 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zsb),
4513 &gen64, sizeof (uint64_t))) != 0) {
4518 gen = (uint32_t)gen64;
4520 size = (zsb->z_parent != zsb) ? LONG_FID_LEN : SHORT_FID_LEN;
4521 if (fidp->fid_len < size) {
4522 fidp->fid_len = size;
4524 return (SET_ERROR(ENOSPC));
4527 zfid = (zfid_short_t *)fidp;
4529 zfid->zf_len = size;
4531 for (i = 0; i < sizeof (zfid->zf_object); i++)
4532 zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
4534 /* Must have a non-zero generation number to distinguish from .zfs */
4537 for (i = 0; i < sizeof (zfid->zf_gen); i++)
4538 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
4540 if (size == LONG_FID_LEN) {
4541 uint64_t objsetid = dmu_objset_id(zsb->z_os);
4544 zlfid = (zfid_long_t *)fidp;
4546 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
4547 zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i));
4549 /* XXX - this should be the generation number for the objset */
4550 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
4551 zlfid->zf_setgen[i] = 0;
4557 EXPORT_SYMBOL(zfs_fid);
4561 zfs_getsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
4563 znode_t *zp = ITOZ(ip);
4564 zfs_sb_t *zsb = ITOZSB(ip);
4566 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
4570 error = zfs_getacl(zp, vsecp, skipaclchk, cr);
4575 EXPORT_SYMBOL(zfs_getsecattr);
4579 zfs_setsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
4581 znode_t *zp = ITOZ(ip);
4582 zfs_sb_t *zsb = ITOZSB(ip);
4584 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
4585 zilog_t *zilog = zsb->z_log;
4590 error = zfs_setacl(zp, vsecp, skipaclchk, cr);
4592 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
4593 zil_commit(zilog, 0);
4598 EXPORT_SYMBOL(zfs_setsecattr);
4600 #ifdef HAVE_UIO_ZEROCOPY
4602 * Tunable, both must be a power of 2.
4604 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4605 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4606 * an arcbuf for a partial block read
4608 int zcr_blksz_min = (1 << 10); /* 1K */
4609 int zcr_blksz_max = (1 << 17); /* 128K */
4613 zfs_reqzcbuf(struct inode *ip, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr)
4615 znode_t *zp = ITOZ(ip);
4616 zfs_sb_t *zsb = ITOZSB(ip);
4617 int max_blksz = zsb->z_max_blksz;
4618 uio_t *uio = &xuio->xu_uio;
4619 ssize_t size = uio->uio_resid;
4620 offset_t offset = uio->uio_loffset;
4625 int preamble, postamble;
4627 if (xuio->xu_type != UIOTYPE_ZEROCOPY)
4628 return (SET_ERROR(EINVAL));
4635 * Loan out an arc_buf for write if write size is bigger than
4636 * max_blksz, and the file's block size is also max_blksz.
4639 if (size < blksz || zp->z_blksz != blksz) {
4641 return (SET_ERROR(EINVAL));
4644 * Caller requests buffers for write before knowing where the
4645 * write offset might be (e.g. NFS TCP write).
4650 preamble = P2PHASE(offset, blksz);
4652 preamble = blksz - preamble;
4657 postamble = P2PHASE(size, blksz);
4660 fullblk = size / blksz;
4661 (void) dmu_xuio_init(xuio,
4662 (preamble != 0) + fullblk + (postamble != 0));
4665 * Have to fix iov base/len for partial buffers. They
4666 * currently represent full arc_buf's.
4669 /* data begins in the middle of the arc_buf */
4670 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
4673 (void) dmu_xuio_add(xuio, abuf,
4674 blksz - preamble, preamble);
4677 for (i = 0; i < fullblk; i++) {
4678 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
4681 (void) dmu_xuio_add(xuio, abuf, 0, blksz);
4685 /* data ends in the middle of the arc_buf */
4686 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
4689 (void) dmu_xuio_add(xuio, abuf, 0, postamble);
4694 * Loan out an arc_buf for read if the read size is larger than
4695 * the current file block size. Block alignment is not
4696 * considered. Partial arc_buf will be loaned out for read.
4698 blksz = zp->z_blksz;
4699 if (blksz < zcr_blksz_min)
4700 blksz = zcr_blksz_min;
4701 if (blksz > zcr_blksz_max)
4702 blksz = zcr_blksz_max;
4703 /* avoid potential complexity of dealing with it */
4704 if (blksz > max_blksz) {
4706 return (SET_ERROR(EINVAL));
4709 maxsize = zp->z_size - uio->uio_loffset;
4715 return (SET_ERROR(EINVAL));
4720 return (SET_ERROR(EINVAL));
4723 uio->uio_extflg = UIO_XUIO;
4724 XUIO_XUZC_RW(xuio) = ioflag;
4731 zfs_retzcbuf(struct inode *ip, xuio_t *xuio, cred_t *cr)
4735 int ioflag = XUIO_XUZC_RW(xuio);
4737 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY);
4739 i = dmu_xuio_cnt(xuio);
4741 abuf = dmu_xuio_arcbuf(xuio, i);
4743 * if abuf == NULL, it must be a write buffer
4744 * that has been returned in zfs_write().
4747 dmu_return_arcbuf(abuf);
4748 ASSERT(abuf || ioflag == UIO_WRITE);
4751 dmu_xuio_fini(xuio);
4754 #endif /* HAVE_UIO_ZEROCOPY */
4756 #if defined(_KERNEL) && defined(HAVE_SPL)
4757 module_param(zfs_delete_blocks, ulong, 0644);
4758 MODULE_PARM_DESC(zfs_delete_blocks, "Delete files larger than N blocks async");
4759 module_param(zfs_read_chunk_size, long, 0644);
4760 MODULE_PARM_DESC(zfs_read_chunk_size, "Bytes to read per chunk");