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];
606 ASSERTV(int iovcnt = uio->uio_iovcnt);
609 * Fasttrack empty write
615 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
621 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
622 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
623 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zsb), NULL, &zp->z_size, 8);
624 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
628 * Callers might not be able to detect properly that we are read-only,
629 * so check it explicitly here.
631 if (zfs_is_readonly(zsb)) {
633 return (SET_ERROR(EROFS));
637 * If immutable or not appending then return EPERM
639 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
640 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) &&
641 (uio->uio_loffset < zp->z_size))) {
643 return (SET_ERROR(EPERM));
649 * Validate file offset
651 woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset;
654 return (SET_ERROR(EINVAL));
658 * Pre-fault the pages to ensure slow (eg NFS) pages
660 * Skip this if uio contains loaned arc_buf.
662 #ifdef HAVE_UIO_ZEROCOPY
663 if ((uio->uio_extflg == UIO_XUIO) &&
664 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY))
665 xuio = (xuio_t *)uio;
668 uio_prefaultpages(MIN(n, max_blksz), uio);
671 * If in append mode, set the io offset pointer to eof.
673 if (ioflag & FAPPEND) {
675 * Obtain an appending range lock to guarantee file append
676 * semantics. We reset the write offset once we have the lock.
678 rl = zfs_range_lock(&zp->z_range_lock, 0, n, RL_APPEND);
680 if (rl->r_len == UINT64_MAX) {
682 * We overlocked the file because this write will cause
683 * the file block size to increase.
684 * Note that zp_size cannot change with this lock held.
688 uio->uio_loffset = woff;
691 * Note that if the file block size will change as a result of
692 * this write, then this range lock will lock the entire file
693 * so that we can re-write the block safely.
695 rl = zfs_range_lock(&zp->z_range_lock, woff, n, RL_WRITER);
699 zfs_range_unlock(rl);
701 return (SET_ERROR(EFBIG));
704 if ((woff + n) > limit || woff > (limit - n))
707 /* Will this write extend the file length? */
708 write_eof = (woff + n > zp->z_size);
710 end_size = MAX(zp->z_size, woff + n);
713 * Write the file in reasonable size chunks. Each chunk is written
714 * in a separate transaction; this keeps the intent log records small
715 * and allows us to do more fine-grained space accounting.
719 woff = uio->uio_loffset;
720 if (zfs_owner_overquota(zsb, zp, B_FALSE) ||
721 zfs_owner_overquota(zsb, zp, B_TRUE)) {
723 dmu_return_arcbuf(abuf);
724 error = SET_ERROR(EDQUOT);
728 if (xuio && abuf == NULL) {
729 ASSERT(i_iov < iovcnt);
730 ASSERT3U(uio->uio_segflg, !=, UIO_BVEC);
732 abuf = dmu_xuio_arcbuf(xuio, i_iov);
733 dmu_xuio_clear(xuio, i_iov);
734 ASSERT((aiov->iov_base == abuf->b_data) ||
735 ((char *)aiov->iov_base - (char *)abuf->b_data +
736 aiov->iov_len == arc_buf_size(abuf)));
738 } else if (abuf == NULL && n >= max_blksz &&
739 woff >= zp->z_size &&
740 P2PHASE(woff, max_blksz) == 0 &&
741 zp->z_blksz == max_blksz) {
743 * This write covers a full block. "Borrow" a buffer
744 * from the dmu so that we can fill it before we enter
745 * a transaction. This avoids the possibility of
746 * holding up the transaction if the data copy hangs
747 * up on a pagefault (e.g., from an NFS server mapping).
751 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
753 ASSERT(abuf != NULL);
754 ASSERT(arc_buf_size(abuf) == max_blksz);
755 if ((error = uiocopy(abuf->b_data, max_blksz,
756 UIO_WRITE, uio, &cbytes))) {
757 dmu_return_arcbuf(abuf);
760 ASSERT(cbytes == max_blksz);
764 * Start a transaction.
766 tx = dmu_tx_create(zsb->z_os);
767 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
768 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz));
769 zfs_sa_upgrade_txholds(tx, zp);
770 error = dmu_tx_assign(tx, TXG_WAIT);
774 dmu_return_arcbuf(abuf);
779 * If zfs_range_lock() over-locked we grow the blocksize
780 * and then reduce the lock range. This will only happen
781 * on the first iteration since zfs_range_reduce() will
782 * shrink down r_len to the appropriate size.
784 if (rl->r_len == UINT64_MAX) {
787 if (zp->z_blksz > max_blksz) {
789 * File's blocksize is already larger than the
790 * "recordsize" property. Only let it grow to
791 * the next power of 2.
793 ASSERT(!ISP2(zp->z_blksz));
794 new_blksz = MIN(end_size,
795 1 << highbit64(zp->z_blksz));
797 new_blksz = MIN(end_size, max_blksz);
799 zfs_grow_blocksize(zp, new_blksz, tx);
800 zfs_range_reduce(rl, woff, n);
804 * XXX - should we really limit each write to z_max_blksz?
805 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
807 nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz));
810 tx_bytes = uio->uio_resid;
811 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
813 tx_bytes -= uio->uio_resid;
816 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len);
818 * If this is not a full block write, but we are
819 * extending the file past EOF and this data starts
820 * block-aligned, use assign_arcbuf(). Otherwise,
821 * write via dmu_write().
823 if (tx_bytes < max_blksz && (!write_eof ||
824 aiov->iov_base != abuf->b_data)) {
826 dmu_write(zsb->z_os, zp->z_id, woff,
827 aiov->iov_len, aiov->iov_base, tx);
828 dmu_return_arcbuf(abuf);
829 xuio_stat_wbuf_copied();
831 ASSERT(xuio || tx_bytes == max_blksz);
832 dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl),
835 ASSERT(tx_bytes <= uio->uio_resid);
836 uioskip(uio, tx_bytes);
839 if (tx_bytes && zp->z_is_mapped && !(ioflag & O_DIRECT))
840 update_pages(ip, woff, tx_bytes, zsb->z_os, zp->z_id);
843 * If we made no progress, we're done. If we made even
844 * partial progress, update the znode and ZIL accordingly.
847 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zsb),
848 (void *)&zp->z_size, sizeof (uint64_t), tx);
855 * Clear Set-UID/Set-GID bits on successful write if not
856 * privileged and at least one of the excute bits is set.
858 * It would be nice to to this after all writes have
859 * been done, but that would still expose the ISUID/ISGID
860 * to another app after the partial write is committed.
862 * Note: we don't call zfs_fuid_map_id() here because
863 * user 0 is not an ephemeral uid.
865 mutex_enter(&zp->z_acl_lock);
866 uid = KUID_TO_SUID(ip->i_uid);
867 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) |
868 (S_IXUSR >> 6))) != 0 &&
869 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 &&
870 secpolicy_vnode_setid_retain(cr,
871 ((zp->z_mode & S_ISUID) != 0 && uid == 0)) != 0) {
873 zp->z_mode &= ~(S_ISUID | S_ISGID);
874 ip->i_mode = newmode = zp->z_mode;
875 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zsb),
876 (void *)&newmode, sizeof (uint64_t), tx);
878 mutex_exit(&zp->z_acl_lock);
880 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
883 * Update the file size (zp_size) if it has changed;
884 * account for possible concurrent updates.
886 while ((end_size = zp->z_size) < uio->uio_loffset) {
887 (void) atomic_cas_64(&zp->z_size, end_size,
892 * If we are replaying and eof is non zero then force
893 * the file size to the specified eof. Note, there's no
894 * concurrency during replay.
896 if (zsb->z_replay && zsb->z_replay_eof != 0)
897 zp->z_size = zsb->z_replay_eof;
899 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
901 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag,
907 ASSERT(tx_bytes == nbytes);
911 uio_prefaultpages(MIN(n, max_blksz), uio);
914 zfs_inode_update(zp);
915 zfs_range_unlock(rl);
918 * If we're in replay mode, or we made no progress, return error.
919 * Otherwise, it's at least a partial write, so it's successful.
921 if (zsb->z_replay || uio->uio_resid == start_resid) {
926 if (ioflag & (FSYNC | FDSYNC) ||
927 zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
928 zil_commit(zilog, zp->z_id);
933 EXPORT_SYMBOL(zfs_write);
936 * Drop a reference on the passed inode asynchronously. This ensures
937 * that the caller will never drop the last reference on an inode in
938 * the current context. Doing so while holding open a tx could result
939 * in a deadlock if iput_final() re-enters the filesystem code.
942 zfs_iput_async(struct inode *ip)
944 objset_t *os = ITOZSB(ip)->z_os;
946 ASSERT(atomic_read(&ip->i_count) > 0);
949 if (atomic_read(&ip->i_count) == 1)
950 VERIFY(taskq_dispatch(dsl_pool_iput_taskq(dmu_objset_pool(os)),
951 (task_func_t *)iput, ip, TQ_SLEEP) != 0);
957 zfs_get_done(zgd_t *zgd, int error)
959 znode_t *zp = zgd->zgd_private;
962 dmu_buf_rele(zgd->zgd_db, zgd);
964 zfs_range_unlock(zgd->zgd_rl);
967 * Release the vnode asynchronously as we currently have the
968 * txg stopped from syncing.
970 zfs_iput_async(ZTOI(zp));
972 if (error == 0 && zgd->zgd_bp)
973 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
975 kmem_free(zgd, sizeof (zgd_t));
979 static int zil_fault_io = 0;
983 * Get data to generate a TX_WRITE intent log record.
986 zfs_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
989 objset_t *os = zsb->z_os;
991 uint64_t object = lr->lr_foid;
992 uint64_t offset = lr->lr_offset;
993 uint64_t size = lr->lr_length;
994 blkptr_t *bp = &lr->lr_blkptr;
1003 * Nothing to do if the file has been removed
1005 if (zfs_zget(zsb, object, &zp) != 0)
1006 return (SET_ERROR(ENOENT));
1007 if (zp->z_unlinked) {
1009 * Release the vnode asynchronously as we currently have the
1010 * txg stopped from syncing.
1012 zfs_iput_async(ZTOI(zp));
1013 return (SET_ERROR(ENOENT));
1016 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1017 zgd->zgd_zilog = zsb->z_log;
1018 zgd->zgd_private = zp;
1021 * Write records come in two flavors: immediate and indirect.
1022 * For small writes it's cheaper to store the data with the
1023 * log record (immediate); for large writes it's cheaper to
1024 * sync the data and get a pointer to it (indirect) so that
1025 * we don't have to write the data twice.
1027 if (buf != NULL) { /* immediate write */
1028 zgd->zgd_rl = zfs_range_lock(&zp->z_range_lock, offset, size,
1030 /* test for truncation needs to be done while range locked */
1031 if (offset >= zp->z_size) {
1032 error = SET_ERROR(ENOENT);
1034 error = dmu_read(os, object, offset, size, buf,
1035 DMU_READ_NO_PREFETCH);
1037 ASSERT(error == 0 || error == ENOENT);
1038 } else { /* indirect write */
1040 * Have to lock the whole block to ensure when it's
1041 * written out and it's checksum is being calculated
1042 * that no one can change the data. We need to re-check
1043 * blocksize after we get the lock in case it's changed!
1048 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset;
1050 zgd->zgd_rl = zfs_range_lock(&zp->z_range_lock, offset,
1052 if (zp->z_blksz == size)
1055 zfs_range_unlock(zgd->zgd_rl);
1057 /* test for truncation needs to be done while range locked */
1058 if (lr->lr_offset >= zp->z_size)
1059 error = SET_ERROR(ENOENT);
1062 error = SET_ERROR(EIO);
1067 error = dmu_buf_hold(os, object, offset, zgd, &db,
1068 DMU_READ_NO_PREFETCH);
1071 blkptr_t *obp = dmu_buf_get_blkptr(db);
1073 ASSERT(BP_IS_HOLE(bp));
1080 ASSERT(db->db_offset == offset);
1081 ASSERT(db->db_size == size);
1083 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1085 ASSERT(error || lr->lr_length <= zp->z_blksz);
1088 * On success, we need to wait for the write I/O
1089 * initiated by dmu_sync() to complete before we can
1090 * release this dbuf. We will finish everything up
1091 * in the zfs_get_done() callback.
1096 if (error == EALREADY) {
1097 lr->lr_common.lrc_txtype = TX_WRITE2;
1103 zfs_get_done(zgd, error);
1110 zfs_access(struct inode *ip, int mode, int flag, cred_t *cr)
1112 znode_t *zp = ITOZ(ip);
1113 zfs_sb_t *zsb = ITOZSB(ip);
1119 if (flag & V_ACE_MASK)
1120 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
1122 error = zfs_zaccess_rwx(zp, mode, flag, cr);
1127 EXPORT_SYMBOL(zfs_access);
1130 * Lookup an entry in a directory, or an extended attribute directory.
1131 * If it exists, return a held inode reference for it.
1133 * IN: dip - inode of directory to search.
1134 * nm - name of entry to lookup.
1135 * flags - LOOKUP_XATTR set if looking for an attribute.
1136 * cr - credentials of caller.
1137 * direntflags - directory lookup flags
1138 * realpnp - returned pathname.
1140 * OUT: ipp - inode of located entry, NULL if not found.
1142 * RETURN: 0 on success, error code on failure.
1149 zfs_lookup(struct inode *dip, char *nm, struct inode **ipp, int flags,
1150 cred_t *cr, int *direntflags, pathname_t *realpnp)
1152 znode_t *zdp = ITOZ(dip);
1153 zfs_sb_t *zsb = ITOZSB(dip);
1157 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
1159 if (!S_ISDIR(dip->i_mode)) {
1160 return (SET_ERROR(ENOTDIR));
1161 } else if (zdp->z_sa_hdl == NULL) {
1162 return (SET_ERROR(EIO));
1165 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
1166 error = zfs_fastaccesschk_execute(zdp, cr);
1175 vnode_t *tvp = dnlc_lookup(dvp, nm);
1178 error = zfs_fastaccesschk_execute(zdp, cr);
1183 if (tvp == DNLC_NO_VNODE) {
1185 return (SET_ERROR(ENOENT));
1188 return (specvp_check(vpp, cr));
1191 #endif /* HAVE_DNLC */
1200 if (flags & LOOKUP_XATTR) {
1202 * We don't allow recursive attributes..
1203 * Maybe someday we will.
1205 if (zdp->z_pflags & ZFS_XATTR) {
1207 return (SET_ERROR(EINVAL));
1210 if ((error = zfs_get_xattrdir(zdp, ipp, cr, flags))) {
1216 * Do we have permission to get into attribute directory?
1219 if ((error = zfs_zaccess(ITOZ(*ipp), ACE_EXECUTE, 0,
1229 if (!S_ISDIR(dip->i_mode)) {
1231 return (SET_ERROR(ENOTDIR));
1235 * Check accessibility of directory.
1238 if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr))) {
1243 if (zsb->z_utf8 && u8_validate(nm, strlen(nm),
1244 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1246 return (SET_ERROR(EILSEQ));
1249 error = zfs_dirlook(zdp, nm, ipp, flags, direntflags, realpnp);
1250 if ((error == 0) && (*ipp))
1251 zfs_inode_update(ITOZ(*ipp));
1256 EXPORT_SYMBOL(zfs_lookup);
1259 * Attempt to create a new entry in a directory. If the entry
1260 * already exists, truncate the file if permissible, else return
1261 * an error. Return the ip of the created or trunc'd file.
1263 * IN: dip - inode of directory to put new file entry in.
1264 * name - name of new file entry.
1265 * vap - attributes of new file.
1266 * excl - flag indicating exclusive or non-exclusive mode.
1267 * mode - mode to open file with.
1268 * cr - credentials of caller.
1269 * flag - large file flag [UNUSED].
1270 * vsecp - ACL to be set
1272 * OUT: ipp - inode of created or trunc'd entry.
1274 * RETURN: 0 on success, error code on failure.
1277 * dip - ctime|mtime updated if new entry created
1278 * ip - ctime|mtime always, atime if new
1283 zfs_create(struct inode *dip, char *name, vattr_t *vap, int excl,
1284 int mode, struct inode **ipp, cred_t *cr, int flag, vsecattr_t *vsecp)
1286 znode_t *zp, *dzp = ITOZ(dip);
1287 zfs_sb_t *zsb = ITOZSB(dip);
1295 zfs_acl_ids_t acl_ids;
1296 boolean_t fuid_dirtied;
1297 boolean_t have_acl = B_FALSE;
1298 boolean_t waited = B_FALSE;
1301 * If we have an ephemeral id, ACL, or XVATTR then
1302 * make sure file system is at proper version
1308 if (zsb->z_use_fuids == B_FALSE &&
1309 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1310 return (SET_ERROR(EINVAL));
1317 if (zsb->z_utf8 && u8_validate(name, strlen(name),
1318 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1320 return (SET_ERROR(EILSEQ));
1323 if (vap->va_mask & ATTR_XVATTR) {
1324 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1325 crgetuid(cr), cr, vap->va_mode)) != 0) {
1333 if (*name == '\0') {
1335 * Null component name refers to the directory itself.
1342 /* possible igrab(zp) */
1345 if (flag & FIGNORECASE)
1348 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1352 zfs_acl_ids_free(&acl_ids);
1353 if (strcmp(name, "..") == 0)
1354 error = SET_ERROR(EISDIR);
1364 * Create a new file object and update the directory
1367 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
1369 zfs_acl_ids_free(&acl_ids);
1374 * We only support the creation of regular files in
1375 * extended attribute directories.
1378 if ((dzp->z_pflags & ZFS_XATTR) && !S_ISREG(vap->va_mode)) {
1380 zfs_acl_ids_free(&acl_ids);
1381 error = SET_ERROR(EINVAL);
1385 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1386 cr, vsecp, &acl_ids)) != 0)
1390 if (zfs_acl_ids_overquota(zsb, &acl_ids)) {
1391 zfs_acl_ids_free(&acl_ids);
1392 error = SET_ERROR(EDQUOT);
1396 tx = dmu_tx_create(os);
1398 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1399 ZFS_SA_BASE_ATTR_SIZE);
1401 fuid_dirtied = zsb->z_fuid_dirty;
1403 zfs_fuid_txhold(zsb, tx);
1404 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
1405 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
1406 if (!zsb->z_use_sa &&
1407 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1408 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1409 0, acl_ids.z_aclp->z_acl_bytes);
1411 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1413 zfs_dirent_unlock(dl);
1414 if (error == ERESTART) {
1420 zfs_acl_ids_free(&acl_ids);
1425 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1428 zfs_fuid_sync(zsb, tx);
1430 (void) zfs_link_create(dl, zp, tx, ZNEW);
1431 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
1432 if (flag & FIGNORECASE)
1434 zfs_log_create(zilog, tx, txtype, dzp, zp, name,
1435 vsecp, acl_ids.z_fuidp, vap);
1436 zfs_acl_ids_free(&acl_ids);
1439 int aflags = (flag & FAPPEND) ? V_APPEND : 0;
1442 zfs_acl_ids_free(&acl_ids);
1446 * A directory entry already exists for this name.
1449 * Can't truncate an existing file if in exclusive mode.
1452 error = SET_ERROR(EEXIST);
1456 * Can't open a directory for writing.
1458 if (S_ISDIR(ZTOI(zp)->i_mode)) {
1459 error = SET_ERROR(EISDIR);
1463 * Verify requested access to file.
1465 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
1469 mutex_enter(&dzp->z_lock);
1471 mutex_exit(&dzp->z_lock);
1474 * Truncate regular files if requested.
1476 if (S_ISREG(ZTOI(zp)->i_mode) &&
1477 (vap->va_mask & ATTR_SIZE) && (vap->va_size == 0)) {
1478 /* we can't hold any locks when calling zfs_freesp() */
1480 zfs_dirent_unlock(dl);
1483 error = zfs_freesp(zp, 0, 0, mode, TRUE);
1489 zfs_dirent_unlock(dl);
1495 zfs_inode_update(dzp);
1496 zfs_inode_update(zp);
1500 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
1501 zil_commit(zilog, 0);
1506 EXPORT_SYMBOL(zfs_create);
1509 * Remove an entry from a directory.
1511 * IN: dip - inode of directory to remove entry from.
1512 * name - name of entry to remove.
1513 * cr - credentials of caller.
1515 * RETURN: 0 if success
1516 * error code if failure
1520 * ip - ctime (if nlink > 0)
1523 uint64_t null_xattr = 0;
1527 zfs_remove(struct inode *dip, char *name, cred_t *cr, int flags)
1529 znode_t *zp, *dzp = ITOZ(dip);
1532 zfs_sb_t *zsb = ITOZSB(dip);
1534 uint64_t acl_obj, xattr_obj;
1535 uint64_t xattr_obj_unlinked = 0;
1540 boolean_t may_delete_now, delete_now = FALSE;
1541 boolean_t unlinked, toobig = FALSE;
1543 pathname_t *realnmp = NULL;
1547 boolean_t waited = B_FALSE;
1553 if (flags & FIGNORECASE) {
1563 * Attempt to lock directory; fail if entry doesn't exist.
1565 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1575 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
1580 * Need to use rmdir for removing directories.
1582 if (S_ISDIR(ip->i_mode)) {
1583 error = SET_ERROR(EPERM);
1589 dnlc_remove(dvp, realnmp->pn_buf);
1591 dnlc_remove(dvp, name);
1592 #endif /* HAVE_DNLC */
1594 mutex_enter(&zp->z_lock);
1595 may_delete_now = atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped);
1596 mutex_exit(&zp->z_lock);
1599 * We may delete the znode now, or we may put it in the unlinked set;
1600 * it depends on whether we're the last link, and on whether there are
1601 * other holds on the inode. So we dmu_tx_hold() the right things to
1602 * allow for either case.
1605 tx = dmu_tx_create(zsb->z_os);
1606 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
1607 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1608 zfs_sa_upgrade_txholds(tx, zp);
1609 zfs_sa_upgrade_txholds(tx, dzp);
1610 if (may_delete_now) {
1611 toobig = zp->z_size > zp->z_blksz * zfs_delete_blocks;
1612 /* if the file is too big, only hold_free a token amount */
1613 dmu_tx_hold_free(tx, zp->z_id, 0,
1614 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
1617 /* are there any extended attributes? */
1618 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zsb),
1619 &xattr_obj, sizeof (xattr_obj));
1620 if (error == 0 && xattr_obj) {
1621 error = zfs_zget(zsb, xattr_obj, &xzp);
1623 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1624 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
1627 mutex_enter(&zp->z_lock);
1628 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
1629 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
1630 mutex_exit(&zp->z_lock);
1632 /* charge as an update -- would be nice not to charge at all */
1633 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
1636 * Mark this transaction as typically resulting in a net free of space
1638 dmu_tx_mark_netfree(tx);
1640 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1642 zfs_dirent_unlock(dl);
1646 if (error == ERESTART) {
1660 * Remove the directory entry.
1662 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
1671 * Hold z_lock so that we can make sure that the ACL obj
1672 * hasn't changed. Could have been deleted due to
1675 mutex_enter(&zp->z_lock);
1676 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zsb),
1677 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
1678 delete_now = may_delete_now && !toobig &&
1679 atomic_read(&ip->i_count) == 1 && !(zp->z_is_mapped) &&
1680 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) ==
1685 if (xattr_obj_unlinked) {
1686 ASSERT3U(ZTOI(xzp)->i_nlink, ==, 2);
1687 mutex_enter(&xzp->z_lock);
1688 xzp->z_unlinked = 1;
1689 clear_nlink(ZTOI(xzp));
1691 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zsb),
1692 &links, sizeof (links), tx);
1693 ASSERT3U(error, ==, 0);
1694 mutex_exit(&xzp->z_lock);
1695 zfs_unlinked_add(xzp, tx);
1698 error = sa_remove(zp->z_sa_hdl,
1699 SA_ZPL_XATTR(zsb), tx);
1701 error = sa_update(zp->z_sa_hdl,
1702 SA_ZPL_XATTR(zsb), &null_xattr,
1703 sizeof (uint64_t), tx);
1707 * Add to the unlinked set because a new reference could be
1708 * taken concurrently resulting in a deferred destruction.
1710 zfs_unlinked_add(zp, tx);
1711 mutex_exit(&zp->z_lock);
1712 zfs_inode_update(zp);
1714 } else if (unlinked) {
1715 mutex_exit(&zp->z_lock);
1716 zfs_unlinked_add(zp, tx);
1720 if (flags & FIGNORECASE)
1722 zfs_log_remove(zilog, tx, txtype, dzp, name, obj);
1729 zfs_dirent_unlock(dl);
1730 zfs_inode_update(dzp);
1733 zfs_inode_update(zp);
1738 zfs_inode_update(xzp);
1739 zfs_iput_async(ZTOI(xzp));
1742 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
1743 zil_commit(zilog, 0);
1748 EXPORT_SYMBOL(zfs_remove);
1751 * Create a new directory and insert it into dip using the name
1752 * provided. Return a pointer to the inserted directory.
1754 * IN: dip - inode of directory to add subdir to.
1755 * dirname - name of new directory.
1756 * vap - attributes of new directory.
1757 * cr - credentials of caller.
1758 * vsecp - ACL to be set
1760 * OUT: ipp - inode of created directory.
1762 * RETURN: 0 if success
1763 * error code if failure
1766 * dip - ctime|mtime updated
1767 * ipp - ctime|mtime|atime updated
1771 zfs_mkdir(struct inode *dip, char *dirname, vattr_t *vap, struct inode **ipp,
1772 cred_t *cr, int flags, vsecattr_t *vsecp)
1774 znode_t *zp, *dzp = ITOZ(dip);
1775 zfs_sb_t *zsb = ITOZSB(dip);
1783 gid_t gid = crgetgid(cr);
1784 zfs_acl_ids_t acl_ids;
1785 boolean_t fuid_dirtied;
1786 boolean_t waited = B_FALSE;
1788 ASSERT(S_ISDIR(vap->va_mode));
1791 * If we have an ephemeral id, ACL, or XVATTR then
1792 * make sure file system is at proper version
1796 if (zsb->z_use_fuids == B_FALSE &&
1797 (vsecp || IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1798 return (SET_ERROR(EINVAL));
1804 if (dzp->z_pflags & ZFS_XATTR) {
1806 return (SET_ERROR(EINVAL));
1809 if (zsb->z_utf8 && u8_validate(dirname,
1810 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1812 return (SET_ERROR(EILSEQ));
1814 if (flags & FIGNORECASE)
1817 if (vap->va_mask & ATTR_XVATTR) {
1818 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1819 crgetuid(cr), cr, vap->va_mode)) != 0) {
1825 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
1826 vsecp, &acl_ids)) != 0) {
1831 * First make sure the new directory doesn't exist.
1833 * Existence is checked first to make sure we don't return
1834 * EACCES instead of EEXIST which can cause some applications
1840 if ((error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
1842 zfs_acl_ids_free(&acl_ids);
1847 if ((error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr))) {
1848 zfs_acl_ids_free(&acl_ids);
1849 zfs_dirent_unlock(dl);
1854 if (zfs_acl_ids_overquota(zsb, &acl_ids)) {
1855 zfs_acl_ids_free(&acl_ids);
1856 zfs_dirent_unlock(dl);
1858 return (SET_ERROR(EDQUOT));
1862 * Add a new entry to the directory.
1864 tx = dmu_tx_create(zsb->z_os);
1865 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
1866 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
1867 fuid_dirtied = zsb->z_fuid_dirty;
1869 zfs_fuid_txhold(zsb, tx);
1870 if (!zsb->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1871 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
1872 acl_ids.z_aclp->z_acl_bytes);
1875 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1876 ZFS_SA_BASE_ATTR_SIZE);
1878 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1880 zfs_dirent_unlock(dl);
1881 if (error == ERESTART) {
1887 zfs_acl_ids_free(&acl_ids);
1896 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1899 zfs_fuid_sync(zsb, tx);
1902 * Now put new name in parent dir.
1904 (void) zfs_link_create(dl, zp, tx, ZNEW);
1908 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
1909 if (flags & FIGNORECASE)
1911 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
1912 acl_ids.z_fuidp, vap);
1914 zfs_acl_ids_free(&acl_ids);
1918 zfs_dirent_unlock(dl);
1920 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
1921 zil_commit(zilog, 0);
1923 zfs_inode_update(dzp);
1924 zfs_inode_update(zp);
1928 EXPORT_SYMBOL(zfs_mkdir);
1931 * Remove a directory subdir entry. If the current working
1932 * directory is the same as the subdir to be removed, the
1935 * IN: dip - inode of directory to remove from.
1936 * name - name of directory to be removed.
1937 * cwd - inode of current working directory.
1938 * cr - credentials of caller.
1939 * flags - case flags
1941 * RETURN: 0 on success, error code on failure.
1944 * dip - ctime|mtime updated
1948 zfs_rmdir(struct inode *dip, char *name, struct inode *cwd, cred_t *cr,
1951 znode_t *dzp = ITOZ(dip);
1954 zfs_sb_t *zsb = ITOZSB(dip);
1960 boolean_t waited = B_FALSE;
1966 if (flags & FIGNORECASE)
1972 * Attempt to lock directory; fail if entry doesn't exist.
1974 if ((error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1982 if ((error = zfs_zaccess_delete(dzp, zp, cr))) {
1986 if (!S_ISDIR(ip->i_mode)) {
1987 error = SET_ERROR(ENOTDIR);
1992 error = SET_ERROR(EINVAL);
1997 * Grab a lock on the directory to make sure that noone is
1998 * trying to add (or lookup) entries while we are removing it.
2000 rw_enter(&zp->z_name_lock, RW_WRITER);
2003 * Grab a lock on the parent pointer to make sure we play well
2004 * with the treewalk and directory rename code.
2006 rw_enter(&zp->z_parent_lock, RW_WRITER);
2008 tx = dmu_tx_create(zsb->z_os);
2009 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
2010 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2011 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
2012 zfs_sa_upgrade_txholds(tx, zp);
2013 zfs_sa_upgrade_txholds(tx, dzp);
2014 dmu_tx_mark_netfree(tx);
2015 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
2017 rw_exit(&zp->z_parent_lock);
2018 rw_exit(&zp->z_name_lock);
2019 zfs_dirent_unlock(dl);
2021 if (error == ERESTART) {
2032 error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
2035 uint64_t txtype = TX_RMDIR;
2036 if (flags & FIGNORECASE)
2038 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT);
2043 rw_exit(&zp->z_parent_lock);
2044 rw_exit(&zp->z_name_lock);
2046 zfs_dirent_unlock(dl);
2048 zfs_inode_update(dzp);
2049 zfs_inode_update(zp);
2052 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
2053 zil_commit(zilog, 0);
2058 EXPORT_SYMBOL(zfs_rmdir);
2061 * Read as many directory entries as will fit into the provided
2062 * dirent buffer from the given directory cursor position.
2064 * IN: ip - inode of directory to read.
2065 * dirent - buffer for directory entries.
2067 * OUT: dirent - filler buffer of directory entries.
2069 * RETURN: 0 if success
2070 * error code if failure
2073 * ip - atime updated
2075 * Note that the low 4 bits of the cookie returned by zap is always zero.
2076 * This allows us to use the low range for "special" directory entries:
2077 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2078 * we use the offset 2 for the '.zfs' directory.
2082 zfs_readdir(struct inode *ip, struct dir_context *ctx, cred_t *cr)
2084 znode_t *zp = ITOZ(ip);
2085 zfs_sb_t *zsb = ITOZSB(ip);
2088 zap_attribute_t zap;
2094 uint64_t offset; /* must be unsigned; checks for < 1 */
2099 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zsb),
2100 &parent, sizeof (parent))) != 0)
2104 * Quit if directory has been removed (posix)
2112 prefetch = zp->z_zn_prefetch;
2115 * Initialize the iterator cursor.
2119 * Start iteration from the beginning of the directory.
2121 zap_cursor_init(&zc, os, zp->z_id);
2124 * The offset is a serialized cursor.
2126 zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
2130 * Transform to file-system independent format
2135 * Special case `.', `..', and `.zfs'.
2138 (void) strcpy(zap.za_name, ".");
2139 zap.za_normalization_conflict = 0;
2142 } else if (offset == 1) {
2143 (void) strcpy(zap.za_name, "..");
2144 zap.za_normalization_conflict = 0;
2147 } else if (offset == 2 && zfs_show_ctldir(zp)) {
2148 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
2149 zap.za_normalization_conflict = 0;
2150 objnum = ZFSCTL_INO_ROOT;
2156 if ((error = zap_cursor_retrieve(&zc, &zap))) {
2157 if (error == ENOENT)
2164 * Allow multiple entries provided the first entry is
2165 * the object id. Non-zpl consumers may safely make
2166 * use of the additional space.
2168 * XXX: This should be a feature flag for compatibility
2170 if (zap.za_integer_length != 8 ||
2171 zap.za_num_integers == 0) {
2172 cmn_err(CE_WARN, "zap_readdir: bad directory "
2173 "entry, obj = %lld, offset = %lld, "
2174 "length = %d, num = %lld\n",
2175 (u_longlong_t)zp->z_id,
2176 (u_longlong_t)offset,
2177 zap.za_integer_length,
2178 (u_longlong_t)zap.za_num_integers);
2179 error = SET_ERROR(ENXIO);
2183 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
2184 type = ZFS_DIRENT_TYPE(zap.za_first_integer);
2187 done = !dir_emit(ctx, zap.za_name, strlen(zap.za_name),
2192 /* Prefetch znode */
2194 dmu_prefetch(os, objnum, 0, 0, 0,
2195 ZIO_PRIORITY_SYNC_READ);
2199 * Move to the next entry, fill in the previous offset.
2201 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) {
2202 zap_cursor_advance(&zc);
2203 offset = zap_cursor_serialize(&zc);
2209 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
2212 zap_cursor_fini(&zc);
2213 if (error == ENOENT)
2220 EXPORT_SYMBOL(zfs_readdir);
2222 ulong_t zfs_fsync_sync_cnt = 4;
2225 zfs_fsync(struct inode *ip, int syncflag, cred_t *cr)
2227 znode_t *zp = ITOZ(ip);
2228 zfs_sb_t *zsb = ITOZSB(ip);
2230 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt);
2232 if (zsb->z_os->os_sync != ZFS_SYNC_DISABLED) {
2235 zil_commit(zsb->z_log, zp->z_id);
2238 tsd_set(zfs_fsyncer_key, NULL);
2242 EXPORT_SYMBOL(zfs_fsync);
2246 * Get the requested file attributes and place them in the provided
2249 * IN: ip - inode of file.
2250 * vap - va_mask identifies requested attributes.
2251 * If ATTR_XVATTR set, then optional attrs are requested
2252 * flags - ATTR_NOACLCHECK (CIFS server context)
2253 * cr - credentials of caller.
2255 * OUT: vap - attribute values.
2257 * RETURN: 0 (always succeeds)
2261 zfs_getattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2263 znode_t *zp = ITOZ(ip);
2264 zfs_sb_t *zsb = ITOZSB(ip);
2267 uint64_t atime[2], mtime[2], ctime[2];
2268 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2269 xoptattr_t *xoap = NULL;
2270 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2271 sa_bulk_attr_t bulk[3];
2277 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);
2279 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zsb), NULL, &atime, 16);
2280 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
2281 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
2283 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
2289 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2290 * Also, if we are the owner don't bother, since owner should
2291 * always be allowed to read basic attributes of file.
2293 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
2294 (vap->va_uid != crgetuid(cr))) {
2295 if ((error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
2303 * Return all attributes. It's cheaper to provide the answer
2304 * than to determine whether we were asked the question.
2307 mutex_enter(&zp->z_lock);
2308 vap->va_type = vn_mode_to_vtype(zp->z_mode);
2309 vap->va_mode = zp->z_mode;
2310 vap->va_fsid = ZTOI(zp)->i_sb->s_dev;
2311 vap->va_nodeid = zp->z_id;
2312 if ((zp->z_id == zsb->z_root) && zfs_show_ctldir(zp))
2313 links = ZTOI(zp)->i_nlink + 1;
2315 links = ZTOI(zp)->i_nlink;
2316 vap->va_nlink = MIN(links, ZFS_LINK_MAX);
2317 vap->va_size = i_size_read(ip);
2318 vap->va_rdev = ip->i_rdev;
2319 vap->va_seq = ip->i_generation;
2322 * Add in any requested optional attributes and the create time.
2323 * Also set the corresponding bits in the returned attribute bitmap.
2325 if ((xoap = xva_getxoptattr(xvap)) != NULL && zsb->z_use_fuids) {
2326 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
2328 ((zp->z_pflags & ZFS_ARCHIVE) != 0);
2329 XVA_SET_RTN(xvap, XAT_ARCHIVE);
2332 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
2333 xoap->xoa_readonly =
2334 ((zp->z_pflags & ZFS_READONLY) != 0);
2335 XVA_SET_RTN(xvap, XAT_READONLY);
2338 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
2340 ((zp->z_pflags & ZFS_SYSTEM) != 0);
2341 XVA_SET_RTN(xvap, XAT_SYSTEM);
2344 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
2346 ((zp->z_pflags & ZFS_HIDDEN) != 0);
2347 XVA_SET_RTN(xvap, XAT_HIDDEN);
2350 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2351 xoap->xoa_nounlink =
2352 ((zp->z_pflags & ZFS_NOUNLINK) != 0);
2353 XVA_SET_RTN(xvap, XAT_NOUNLINK);
2356 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2357 xoap->xoa_immutable =
2358 ((zp->z_pflags & ZFS_IMMUTABLE) != 0);
2359 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
2362 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2363 xoap->xoa_appendonly =
2364 ((zp->z_pflags & ZFS_APPENDONLY) != 0);
2365 XVA_SET_RTN(xvap, XAT_APPENDONLY);
2368 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2370 ((zp->z_pflags & ZFS_NODUMP) != 0);
2371 XVA_SET_RTN(xvap, XAT_NODUMP);
2374 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
2376 ((zp->z_pflags & ZFS_OPAQUE) != 0);
2377 XVA_SET_RTN(xvap, XAT_OPAQUE);
2380 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2381 xoap->xoa_av_quarantined =
2382 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
2383 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
2386 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2387 xoap->xoa_av_modified =
2388 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
2389 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
2392 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
2393 S_ISREG(ip->i_mode)) {
2394 zfs_sa_get_scanstamp(zp, xvap);
2397 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
2400 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zsb),
2401 times, sizeof (times));
2402 ZFS_TIME_DECODE(&xoap->xoa_createtime, times);
2403 XVA_SET_RTN(xvap, XAT_CREATETIME);
2406 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2407 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
2408 XVA_SET_RTN(xvap, XAT_REPARSE);
2410 if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
2411 xoap->xoa_generation = ip->i_generation;
2412 XVA_SET_RTN(xvap, XAT_GEN);
2415 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
2417 ((zp->z_pflags & ZFS_OFFLINE) != 0);
2418 XVA_SET_RTN(xvap, XAT_OFFLINE);
2421 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
2423 ((zp->z_pflags & ZFS_SPARSE) != 0);
2424 XVA_SET_RTN(xvap, XAT_SPARSE);
2428 ZFS_TIME_DECODE(&vap->va_atime, atime);
2429 ZFS_TIME_DECODE(&vap->va_mtime, mtime);
2430 ZFS_TIME_DECODE(&vap->va_ctime, ctime);
2432 mutex_exit(&zp->z_lock);
2434 sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks);
2436 if (zp->z_blksz == 0) {
2438 * Block size hasn't been set; suggest maximal I/O transfers.
2440 vap->va_blksize = zsb->z_max_blksz;
2446 EXPORT_SYMBOL(zfs_getattr);
2449 * Get the basic file attributes and place them in the provided kstat
2450 * structure. The inode is assumed to be the authoritative source
2451 * for most of the attributes. However, the znode currently has the
2452 * authoritative atime, blksize, and block count.
2454 * IN: ip - inode of file.
2456 * OUT: sp - kstat values.
2458 * RETURN: 0 (always succeeds)
2462 zfs_getattr_fast(struct inode *ip, struct kstat *sp)
2464 znode_t *zp = ITOZ(ip);
2465 zfs_sb_t *zsb = ITOZSB(ip);
2467 u_longlong_t nblocks;
2472 mutex_enter(&zp->z_lock);
2474 generic_fillattr(ip, sp);
2476 sa_object_size(zp->z_sa_hdl, &blksize, &nblocks);
2477 sp->blksize = blksize;
2478 sp->blocks = nblocks;
2480 if (unlikely(zp->z_blksz == 0)) {
2482 * Block size hasn't been set; suggest maximal I/O transfers.
2484 sp->blksize = zsb->z_max_blksz;
2487 mutex_exit(&zp->z_lock);
2490 * Required to prevent NFS client from detecting different inode
2491 * numbers of snapshot root dentry before and after snapshot mount.
2493 if (zsb->z_issnap) {
2494 if (ip->i_sb->s_root->d_inode == ip)
2495 sp->ino = ZFSCTL_INO_SNAPDIRS -
2496 dmu_objset_id(zsb->z_os);
2503 EXPORT_SYMBOL(zfs_getattr_fast);
2506 * Set the file attributes to the values contained in the
2509 * IN: ip - inode of file to be modified.
2510 * vap - new attribute values.
2511 * If ATTR_XVATTR set, then optional attrs are being set
2512 * flags - ATTR_UTIME set if non-default time values provided.
2513 * - ATTR_NOACLCHECK (CIFS context only).
2514 * cr - credentials of caller.
2516 * RETURN: 0 if success
2517 * error code if failure
2520 * ip - ctime updated, mtime updated if size changed.
2524 zfs_setattr(struct inode *ip, vattr_t *vap, int flags, cred_t *cr)
2526 znode_t *zp = ITOZ(ip);
2527 zfs_sb_t *zsb = ITOZSB(ip);
2531 xvattr_t *tmpxvattr;
2532 uint_t mask = vap->va_mask;
2533 uint_t saved_mask = 0;
2536 uint64_t new_kuid = 0, new_kgid = 0, new_uid, new_gid;
2538 uint64_t mtime[2], ctime[2], atime[2];
2540 int need_policy = FALSE;
2542 zfs_fuid_info_t *fuidp = NULL;
2543 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2546 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2547 boolean_t fuid_dirtied = B_FALSE;
2548 sa_bulk_attr_t *bulk, *xattr_bulk;
2549 int count = 0, xattr_count = 0;
2560 * Make sure that if we have ephemeral uid/gid or xvattr specified
2561 * that file system is at proper version level
2564 if (zsb->z_use_fuids == B_FALSE &&
2565 (((mask & ATTR_UID) && IS_EPHEMERAL(vap->va_uid)) ||
2566 ((mask & ATTR_GID) && IS_EPHEMERAL(vap->va_gid)) ||
2567 (mask & ATTR_XVATTR))) {
2569 return (SET_ERROR(EINVAL));
2572 if (mask & ATTR_SIZE && S_ISDIR(ip->i_mode)) {
2574 return (SET_ERROR(EISDIR));
2577 if (mask & ATTR_SIZE && !S_ISREG(ip->i_mode) && !S_ISFIFO(ip->i_mode)) {
2579 return (SET_ERROR(EINVAL));
2583 * If this is an xvattr_t, then get a pointer to the structure of
2584 * optional attributes. If this is NULL, then we have a vattr_t.
2586 xoap = xva_getxoptattr(xvap);
2588 tmpxvattr = kmem_alloc(sizeof (xvattr_t), KM_SLEEP);
2589 xva_init(tmpxvattr);
2591 bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * 7, KM_SLEEP);
2592 xattr_bulk = kmem_alloc(sizeof (sa_bulk_attr_t) * 7, KM_SLEEP);
2595 * Immutable files can only alter immutable bit and atime
2597 if ((zp->z_pflags & ZFS_IMMUTABLE) &&
2598 ((mask & (ATTR_SIZE|ATTR_UID|ATTR_GID|ATTR_MTIME|ATTR_MODE)) ||
2599 ((mask & ATTR_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
2604 if ((mask & ATTR_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
2610 * Verify timestamps doesn't overflow 32 bits.
2611 * ZFS can handle large timestamps, but 32bit syscalls can't
2612 * handle times greater than 2039. This check should be removed
2613 * once large timestamps are fully supported.
2615 if (mask & (ATTR_ATIME | ATTR_MTIME)) {
2616 if (((mask & ATTR_ATIME) &&
2617 TIMESPEC_OVERFLOW(&vap->va_atime)) ||
2618 ((mask & ATTR_MTIME) &&
2619 TIMESPEC_OVERFLOW(&vap->va_mtime))) {
2629 /* Can this be moved to before the top label? */
2630 if (zfs_is_readonly(zsb)) {
2636 * First validate permissions
2639 if (mask & ATTR_SIZE) {
2640 err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
2645 * XXX - Note, we are not providing any open
2646 * mode flags here (like FNDELAY), so we may
2647 * block if there are locks present... this
2648 * should be addressed in openat().
2650 /* XXX - would it be OK to generate a log record here? */
2651 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
2656 if (mask & (ATTR_ATIME|ATTR_MTIME) ||
2657 ((mask & ATTR_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) ||
2658 XVA_ISSET_REQ(xvap, XAT_READONLY) ||
2659 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) ||
2660 XVA_ISSET_REQ(xvap, XAT_OFFLINE) ||
2661 XVA_ISSET_REQ(xvap, XAT_SPARSE) ||
2662 XVA_ISSET_REQ(xvap, XAT_CREATETIME) ||
2663 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
2664 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
2668 if (mask & (ATTR_UID|ATTR_GID)) {
2669 int idmask = (mask & (ATTR_UID|ATTR_GID));
2674 * NOTE: even if a new mode is being set,
2675 * we may clear S_ISUID/S_ISGID bits.
2678 if (!(mask & ATTR_MODE))
2679 vap->va_mode = zp->z_mode;
2682 * Take ownership or chgrp to group we are a member of
2685 take_owner = (mask & ATTR_UID) && (vap->va_uid == crgetuid(cr));
2686 take_group = (mask & ATTR_GID) &&
2687 zfs_groupmember(zsb, vap->va_gid, cr);
2690 * If both ATTR_UID and ATTR_GID are set then take_owner and
2691 * take_group must both be set in order to allow taking
2694 * Otherwise, send the check through secpolicy_vnode_setattr()
2698 if (((idmask == (ATTR_UID|ATTR_GID)) &&
2699 take_owner && take_group) ||
2700 ((idmask == ATTR_UID) && take_owner) ||
2701 ((idmask == ATTR_GID) && take_group)) {
2702 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
2703 skipaclchk, cr) == 0) {
2705 * Remove setuid/setgid for non-privileged users
2707 (void) secpolicy_setid_clear(vap, cr);
2708 trim_mask = (mask & (ATTR_UID|ATTR_GID));
2717 mutex_enter(&zp->z_lock);
2718 oldva.va_mode = zp->z_mode;
2719 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
2720 if (mask & ATTR_XVATTR) {
2722 * Update xvattr mask to include only those attributes
2723 * that are actually changing.
2725 * the bits will be restored prior to actually setting
2726 * the attributes so the caller thinks they were set.
2728 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2729 if (xoap->xoa_appendonly !=
2730 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
2733 XVA_CLR_REQ(xvap, XAT_APPENDONLY);
2734 XVA_SET_REQ(tmpxvattr, XAT_APPENDONLY);
2738 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2739 if (xoap->xoa_nounlink !=
2740 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
2743 XVA_CLR_REQ(xvap, XAT_NOUNLINK);
2744 XVA_SET_REQ(tmpxvattr, XAT_NOUNLINK);
2748 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2749 if (xoap->xoa_immutable !=
2750 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
2753 XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
2754 XVA_SET_REQ(tmpxvattr, XAT_IMMUTABLE);
2758 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2759 if (xoap->xoa_nodump !=
2760 ((zp->z_pflags & ZFS_NODUMP) != 0)) {
2763 XVA_CLR_REQ(xvap, XAT_NODUMP);
2764 XVA_SET_REQ(tmpxvattr, XAT_NODUMP);
2768 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2769 if (xoap->xoa_av_modified !=
2770 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
2773 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
2774 XVA_SET_REQ(tmpxvattr, XAT_AV_MODIFIED);
2778 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2779 if ((!S_ISREG(ip->i_mode) &&
2780 xoap->xoa_av_quarantined) ||
2781 xoap->xoa_av_quarantined !=
2782 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
2785 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
2786 XVA_SET_REQ(tmpxvattr, XAT_AV_QUARANTINED);
2790 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2791 mutex_exit(&zp->z_lock);
2796 if (need_policy == FALSE &&
2797 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) ||
2798 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
2803 mutex_exit(&zp->z_lock);
2805 if (mask & ATTR_MODE) {
2806 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
2807 err = secpolicy_setid_setsticky_clear(ip, vap,
2812 trim_mask |= ATTR_MODE;
2820 * If trim_mask is set then take ownership
2821 * has been granted or write_acl is present and user
2822 * has the ability to modify mode. In that case remove
2823 * UID|GID and or MODE from mask so that
2824 * secpolicy_vnode_setattr() doesn't revoke it.
2828 saved_mask = vap->va_mask;
2829 vap->va_mask &= ~trim_mask;
2831 err = secpolicy_vnode_setattr(cr, ip, vap, &oldva, flags,
2832 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
2837 vap->va_mask |= saved_mask;
2841 * secpolicy_vnode_setattr, or take ownership may have
2844 mask = vap->va_mask;
2846 if ((mask & (ATTR_UID | ATTR_GID))) {
2847 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zsb),
2848 &xattr_obj, sizeof (xattr_obj));
2850 if (err == 0 && xattr_obj) {
2851 err = zfs_zget(ZTOZSB(zp), xattr_obj, &attrzp);
2855 if (mask & ATTR_UID) {
2856 new_kuid = zfs_fuid_create(zsb,
2857 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
2858 if (new_kuid != KUID_TO_SUID(ZTOI(zp)->i_uid) &&
2859 zfs_fuid_overquota(zsb, B_FALSE, new_kuid)) {
2867 if (mask & ATTR_GID) {
2868 new_kgid = zfs_fuid_create(zsb, (uint64_t)vap->va_gid,
2869 cr, ZFS_GROUP, &fuidp);
2870 if (new_kgid != KGID_TO_SGID(ZTOI(zp)->i_gid) &&
2871 zfs_fuid_overquota(zsb, B_TRUE, new_kgid)) {
2879 tx = dmu_tx_create(zsb->z_os);
2881 if (mask & ATTR_MODE) {
2882 uint64_t pmode = zp->z_mode;
2884 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
2886 zfs_acl_chmod_setattr(zp, &aclp, new_mode);
2888 mutex_enter(&zp->z_lock);
2889 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
2891 * Are we upgrading ACL from old V0 format
2894 if (zsb->z_version >= ZPL_VERSION_FUID &&
2895 zfs_znode_acl_version(zp) ==
2896 ZFS_ACL_VERSION_INITIAL) {
2897 dmu_tx_hold_free(tx, acl_obj, 0,
2899 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
2900 0, aclp->z_acl_bytes);
2902 dmu_tx_hold_write(tx, acl_obj, 0,
2905 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
2906 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
2907 0, aclp->z_acl_bytes);
2909 mutex_exit(&zp->z_lock);
2910 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2912 if ((mask & ATTR_XVATTR) &&
2913 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
2914 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2916 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2920 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
2923 fuid_dirtied = zsb->z_fuid_dirty;
2925 zfs_fuid_txhold(zsb, tx);
2927 zfs_sa_upgrade_txholds(tx, zp);
2929 err = dmu_tx_assign(tx, TXG_WAIT);
2935 * Set each attribute requested.
2936 * We group settings according to the locks they need to acquire.
2938 * Note: you cannot set ctime directly, although it will be
2939 * updated as a side-effect of calling this function.
2943 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
2944 mutex_enter(&zp->z_acl_lock);
2945 mutex_enter(&zp->z_lock);
2947 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
2948 &zp->z_pflags, sizeof (zp->z_pflags));
2951 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
2952 mutex_enter(&attrzp->z_acl_lock);
2953 mutex_enter(&attrzp->z_lock);
2954 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
2955 SA_ZPL_FLAGS(zsb), NULL, &attrzp->z_pflags,
2956 sizeof (attrzp->z_pflags));
2959 if (mask & (ATTR_UID|ATTR_GID)) {
2961 if (mask & ATTR_UID) {
2962 ZTOI(zp)->i_uid = SUID_TO_KUID(new_kuid);
2963 new_uid = zfs_uid_read(ZTOI(zp));
2964 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zsb), NULL,
2965 &new_uid, sizeof (new_uid));
2967 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
2968 SA_ZPL_UID(zsb), NULL, &new_uid,
2970 ZTOI(attrzp)->i_uid = SUID_TO_KUID(new_uid);
2974 if (mask & ATTR_GID) {
2975 ZTOI(zp)->i_gid = SGID_TO_KGID(new_kgid);
2976 new_gid = zfs_gid_read(ZTOI(zp));
2977 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zsb),
2978 NULL, &new_gid, sizeof (new_gid));
2980 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
2981 SA_ZPL_GID(zsb), NULL, &new_gid,
2983 ZTOI(attrzp)->i_gid = SGID_TO_KGID(new_kgid);
2986 if (!(mask & ATTR_MODE)) {
2987 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb),
2988 NULL, &new_mode, sizeof (new_mode));
2989 new_mode = zp->z_mode;
2991 err = zfs_acl_chown_setattr(zp);
2994 err = zfs_acl_chown_setattr(attrzp);
2999 if (mask & ATTR_MODE) {
3000 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb), NULL,
3001 &new_mode, sizeof (new_mode));
3002 zp->z_mode = ZTOI(zp)->i_mode = new_mode;
3003 ASSERT3P(aclp, !=, NULL);
3004 err = zfs_aclset_common(zp, aclp, cr, tx);
3006 if (zp->z_acl_cached)
3007 zfs_acl_free(zp->z_acl_cached);
3008 zp->z_acl_cached = aclp;
3012 if ((mask & ATTR_ATIME) || zp->z_atime_dirty) {
3013 zp->z_atime_dirty = 0;
3014 ZFS_TIME_ENCODE(&ip->i_atime, atime);
3015 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zsb), NULL,
3016 &atime, sizeof (atime));
3019 if (mask & ATTR_MTIME) {
3020 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
3021 ZTOI(zp)->i_mtime = timespec_trunc(vap->va_mtime,
3022 ZTOI(zp)->i_sb->s_time_gran);
3024 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL,
3025 mtime, sizeof (mtime));
3028 if (mask & ATTR_CTIME) {
3029 ZFS_TIME_ENCODE(&vap->va_ctime, ctime);
3030 ZTOI(zp)->i_ctime = timespec_trunc(vap->va_ctime,
3031 ZTOI(zp)->i_sb->s_time_gran);
3032 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
3033 ctime, sizeof (ctime));
3036 if (attrzp && mask) {
3037 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3038 SA_ZPL_CTIME(zsb), NULL, &ctime,
3043 * Do this after setting timestamps to prevent timestamp
3044 * update from toggling bit
3047 if (xoap && (mask & ATTR_XVATTR)) {
3050 * restore trimmed off masks
3051 * so that return masks can be set for caller.
3054 if (XVA_ISSET_REQ(tmpxvattr, XAT_APPENDONLY)) {
3055 XVA_SET_REQ(xvap, XAT_APPENDONLY);
3057 if (XVA_ISSET_REQ(tmpxvattr, XAT_NOUNLINK)) {
3058 XVA_SET_REQ(xvap, XAT_NOUNLINK);
3060 if (XVA_ISSET_REQ(tmpxvattr, XAT_IMMUTABLE)) {
3061 XVA_SET_REQ(xvap, XAT_IMMUTABLE);
3063 if (XVA_ISSET_REQ(tmpxvattr, XAT_NODUMP)) {
3064 XVA_SET_REQ(xvap, XAT_NODUMP);
3066 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_MODIFIED)) {
3067 XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
3069 if (XVA_ISSET_REQ(tmpxvattr, XAT_AV_QUARANTINED)) {
3070 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
3073 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3074 ASSERT(S_ISREG(ip->i_mode));
3076 zfs_xvattr_set(zp, xvap, tx);
3080 zfs_fuid_sync(zsb, tx);
3083 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);
3085 mutex_exit(&zp->z_lock);
3086 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3087 mutex_exit(&zp->z_acl_lock);
3090 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE))
3091 mutex_exit(&attrzp->z_acl_lock);
3092 mutex_exit(&attrzp->z_lock);
3095 if (err == 0 && attrzp) {
3096 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
3107 zfs_fuid_info_free(fuidp);
3113 if (err == ERESTART)
3116 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
3118 zfs_inode_update(zp);
3122 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3123 zil_commit(zilog, 0);
3126 kmem_free(xattr_bulk, sizeof (sa_bulk_attr_t) * 7);
3127 kmem_free(bulk, sizeof (sa_bulk_attr_t) * 7);
3128 kmem_free(tmpxvattr, sizeof (xvattr_t));
3132 EXPORT_SYMBOL(zfs_setattr);
3134 typedef struct zfs_zlock {
3135 krwlock_t *zl_rwlock; /* lock we acquired */
3136 znode_t *zl_znode; /* znode we held */
3137 struct zfs_zlock *zl_next; /* next in list */
3141 * Drop locks and release vnodes that were held by zfs_rename_lock().
3144 zfs_rename_unlock(zfs_zlock_t **zlpp)
3148 while ((zl = *zlpp) != NULL) {
3149 if (zl->zl_znode != NULL)
3150 iput(ZTOI(zl->zl_znode));
3151 rw_exit(zl->zl_rwlock);
3152 *zlpp = zl->zl_next;
3153 kmem_free(zl, sizeof (*zl));
3158 * Search back through the directory tree, using the ".." entries.
3159 * Lock each directory in the chain to prevent concurrent renames.
3160 * Fail any attempt to move a directory into one of its own descendants.
3161 * XXX - z_parent_lock can overlap with map or grow locks
3164 zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp)
3168 uint64_t rootid = ZTOZSB(zp)->z_root;
3169 uint64_t oidp = zp->z_id;
3170 krwlock_t *rwlp = &szp->z_parent_lock;
3171 krw_t rw = RW_WRITER;
3174 * First pass write-locks szp and compares to zp->z_id.
3175 * Later passes read-lock zp and compare to zp->z_parent.
3178 if (!rw_tryenter(rwlp, rw)) {
3180 * Another thread is renaming in this path.
3181 * Note that if we are a WRITER, we don't have any
3182 * parent_locks held yet.
3184 if (rw == RW_READER && zp->z_id > szp->z_id) {
3186 * Drop our locks and restart
3188 zfs_rename_unlock(&zl);
3192 rwlp = &szp->z_parent_lock;
3197 * Wait for other thread to drop its locks
3203 zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
3204 zl->zl_rwlock = rwlp;
3205 zl->zl_znode = NULL;
3206 zl->zl_next = *zlpp;
3209 if (oidp == szp->z_id) /* We're a descendant of szp */
3210 return (SET_ERROR(EINVAL));
3212 if (oidp == rootid) /* We've hit the top */
3215 if (rw == RW_READER) { /* i.e. not the first pass */
3216 int error = zfs_zget(ZTOZSB(zp), oidp, &zp);
3221 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(ZTOZSB(zp)),
3222 &oidp, sizeof (oidp));
3223 rwlp = &zp->z_parent_lock;
3226 } while (zp->z_id != sdzp->z_id);
3232 * Move an entry from the provided source directory to the target
3233 * directory. Change the entry name as indicated.
3235 * IN: sdip - Source directory containing the "old entry".
3236 * snm - Old entry name.
3237 * tdip - Target directory to contain the "new entry".
3238 * tnm - New entry name.
3239 * cr - credentials of caller.
3240 * flags - case flags
3242 * RETURN: 0 on success, error code on failure.
3245 * sdip,tdip - ctime|mtime updated
3249 zfs_rename(struct inode *sdip, char *snm, struct inode *tdip, char *tnm,
3250 cred_t *cr, int flags)
3252 znode_t *tdzp, *szp, *tzp;
3253 znode_t *sdzp = ITOZ(sdip);
3254 zfs_sb_t *zsb = ITOZSB(sdip);
3256 zfs_dirlock_t *sdl, *tdl;
3259 int cmp, serr, terr;
3262 boolean_t waited = B_FALSE;
3265 ZFS_VERIFY_ZP(sdzp);
3269 ZFS_VERIFY_ZP(tdzp);
3272 * We check i_sb because snapshots and the ctldir must have different
3275 if (tdip->i_sb != sdip->i_sb || zfsctl_is_node(tdip)) {
3277 return (SET_ERROR(EXDEV));
3280 if (zsb->z_utf8 && u8_validate(tnm,
3281 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3283 return (SET_ERROR(EILSEQ));
3286 if (flags & FIGNORECASE)
3295 * This is to prevent the creation of links into attribute space
3296 * by renaming a linked file into/outof an attribute directory.
3297 * See the comment in zfs_link() for why this is considered bad.
3299 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
3301 return (SET_ERROR(EINVAL));
3305 * Lock source and target directory entries. To prevent deadlock,
3306 * a lock ordering must be defined. We lock the directory with
3307 * the smallest object id first, or if it's a tie, the one with
3308 * the lexically first name.
3310 if (sdzp->z_id < tdzp->z_id) {
3312 } else if (sdzp->z_id > tdzp->z_id) {
3316 * First compare the two name arguments without
3317 * considering any case folding.
3319 int nofold = (zsb->z_norm & ~U8_TEXTPREP_TOUPPER);
3321 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
3322 ASSERT(error == 0 || !zsb->z_utf8);
3325 * POSIX: "If the old argument and the new argument
3326 * both refer to links to the same existing file,
3327 * the rename() function shall return successfully
3328 * and perform no other action."
3334 * If the file system is case-folding, then we may
3335 * have some more checking to do. A case-folding file
3336 * system is either supporting mixed case sensitivity
3337 * access or is completely case-insensitive. Note
3338 * that the file system is always case preserving.
3340 * In mixed sensitivity mode case sensitive behavior
3341 * is the default. FIGNORECASE must be used to
3342 * explicitly request case insensitive behavior.
3344 * If the source and target names provided differ only
3345 * by case (e.g., a request to rename 'tim' to 'Tim'),
3346 * we will treat this as a special case in the
3347 * case-insensitive mode: as long as the source name
3348 * is an exact match, we will allow this to proceed as
3349 * a name-change request.
3351 if ((zsb->z_case == ZFS_CASE_INSENSITIVE ||
3352 (zsb->z_case == ZFS_CASE_MIXED &&
3353 flags & FIGNORECASE)) &&
3354 u8_strcmp(snm, tnm, 0, zsb->z_norm, U8_UNICODE_LATEST,
3357 * case preserving rename request, require exact
3366 * If the source and destination directories are the same, we should
3367 * grab the z_name_lock of that directory only once.
3371 rw_enter(&sdzp->z_name_lock, RW_READER);
3375 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
3376 ZEXISTS | zflg, NULL, NULL);
3377 terr = zfs_dirent_lock(&tdl,
3378 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL);
3380 terr = zfs_dirent_lock(&tdl,
3381 tdzp, tnm, &tzp, zflg, NULL, NULL);
3382 serr = zfs_dirent_lock(&sdl,
3383 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg,
3389 * Source entry invalid or not there.
3392 zfs_dirent_unlock(tdl);
3398 rw_exit(&sdzp->z_name_lock);
3400 if (strcmp(snm, "..") == 0)
3406 zfs_dirent_unlock(sdl);
3410 rw_exit(&sdzp->z_name_lock);
3412 if (strcmp(tnm, "..") == 0)
3419 * Must have write access at the source to remove the old entry
3420 * and write access at the target to create the new entry.
3421 * Note that if target and source are the same, this can be
3422 * done in a single check.
3425 if ((error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)))
3428 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3430 * Check to make sure rename is valid.
3431 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3433 if ((error = zfs_rename_lock(szp, tdzp, sdzp, &zl)))
3438 * Does target exist?
3442 * Source and target must be the same type.
3444 if (S_ISDIR(ZTOI(szp)->i_mode)) {
3445 if (!S_ISDIR(ZTOI(tzp)->i_mode)) {
3446 error = SET_ERROR(ENOTDIR);
3450 if (S_ISDIR(ZTOI(tzp)->i_mode)) {
3451 error = SET_ERROR(EISDIR);
3456 * POSIX dictates that when the source and target
3457 * entries refer to the same file object, rename
3458 * must do nothing and exit without error.
3460 if (szp->z_id == tzp->z_id) {
3466 tx = dmu_tx_create(zsb->z_os);
3467 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3468 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
3469 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
3470 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
3472 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
3473 zfs_sa_upgrade_txholds(tx, tdzp);
3476 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
3477 zfs_sa_upgrade_txholds(tx, tzp);
3480 zfs_sa_upgrade_txholds(tx, szp);
3481 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
3482 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3485 zfs_rename_unlock(&zl);
3486 zfs_dirent_unlock(sdl);
3487 zfs_dirent_unlock(tdl);
3490 rw_exit(&sdzp->z_name_lock);
3495 if (error == ERESTART) {
3506 if (tzp) /* Attempt to remove the existing target */
3507 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
3510 error = zfs_link_create(tdl, szp, tx, ZRENAMING);
3512 szp->z_pflags |= ZFS_AV_MODIFIED;
3514 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zsb),
3515 (void *)&szp->z_pflags, sizeof (uint64_t), tx);
3518 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
3520 zfs_log_rename(zilog, tx, TX_RENAME |
3521 (flags & FIGNORECASE ? TX_CI : 0), sdzp,
3522 sdl->dl_name, tdzp, tdl->dl_name, szp);
3525 * At this point, we have successfully created
3526 * the target name, but have failed to remove
3527 * the source name. Since the create was done
3528 * with the ZRENAMING flag, there are
3529 * complications; for one, the link count is
3530 * wrong. The easiest way to deal with this
3531 * is to remove the newly created target, and
3532 * return the original error. This must
3533 * succeed; fortunately, it is very unlikely to
3534 * fail, since we just created it.
3536 VERIFY3U(zfs_link_destroy(tdl, szp, tx,
3537 ZRENAMING, NULL), ==, 0);
3545 zfs_rename_unlock(&zl);
3547 zfs_dirent_unlock(sdl);
3548 zfs_dirent_unlock(tdl);
3550 zfs_inode_update(sdzp);
3552 rw_exit(&sdzp->z_name_lock);
3555 zfs_inode_update(tdzp);
3557 zfs_inode_update(szp);
3560 zfs_inode_update(tzp);
3564 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3565 zil_commit(zilog, 0);
3570 EXPORT_SYMBOL(zfs_rename);
3573 * Insert the indicated symbolic reference entry into the directory.
3575 * IN: dip - Directory to contain new symbolic link.
3576 * link - Name for new symlink entry.
3577 * vap - Attributes of new entry.
3578 * target - Target path of new symlink.
3580 * cr - credentials of caller.
3581 * flags - case flags
3583 * RETURN: 0 on success, error code on failure.
3586 * dip - ctime|mtime updated
3590 zfs_symlink(struct inode *dip, char *name, vattr_t *vap, char *link,
3591 struct inode **ipp, cred_t *cr, int flags)
3593 znode_t *zp, *dzp = ITOZ(dip);
3596 zfs_sb_t *zsb = ITOZSB(dip);
3598 uint64_t len = strlen(link);
3601 zfs_acl_ids_t acl_ids;
3602 boolean_t fuid_dirtied;
3603 uint64_t txtype = TX_SYMLINK;
3604 boolean_t waited = B_FALSE;
3606 ASSERT(S_ISLNK(vap->va_mode));
3612 if (zsb->z_utf8 && u8_validate(name, strlen(name),
3613 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3615 return (SET_ERROR(EILSEQ));
3617 if (flags & FIGNORECASE)
3620 if (len > MAXPATHLEN) {
3622 return (SET_ERROR(ENAMETOOLONG));
3625 if ((error = zfs_acl_ids_create(dzp, 0,
3626 vap, cr, NULL, &acl_ids)) != 0) {
3634 * Attempt to lock directory; fail if entry already exists.
3636 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
3638 zfs_acl_ids_free(&acl_ids);
3643 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
3644 zfs_acl_ids_free(&acl_ids);
3645 zfs_dirent_unlock(dl);
3650 if (zfs_acl_ids_overquota(zsb, &acl_ids)) {
3651 zfs_acl_ids_free(&acl_ids);
3652 zfs_dirent_unlock(dl);
3654 return (SET_ERROR(EDQUOT));
3656 tx = dmu_tx_create(zsb->z_os);
3657 fuid_dirtied = zsb->z_fuid_dirty;
3658 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
3659 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
3660 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
3661 ZFS_SA_BASE_ATTR_SIZE + len);
3662 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
3663 if (!zsb->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3664 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
3665 acl_ids.z_aclp->z_acl_bytes);
3668 zfs_fuid_txhold(zsb, tx);
3669 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3671 zfs_dirent_unlock(dl);
3672 if (error == ERESTART) {
3678 zfs_acl_ids_free(&acl_ids);
3685 * Create a new object for the symlink.
3686 * for version 4 ZPL datsets the symlink will be an SA attribute
3688 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
3691 zfs_fuid_sync(zsb, tx);
3693 mutex_enter(&zp->z_lock);
3695 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zsb),
3698 zfs_sa_symlink(zp, link, len, tx);
3699 mutex_exit(&zp->z_lock);
3702 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zsb),
3703 &zp->z_size, sizeof (zp->z_size), tx);
3705 * Insert the new object into the directory.
3707 (void) zfs_link_create(dl, zp, tx, ZNEW);
3709 if (flags & FIGNORECASE)
3711 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
3713 zfs_inode_update(dzp);
3714 zfs_inode_update(zp);
3716 zfs_acl_ids_free(&acl_ids);
3720 zfs_dirent_unlock(dl);
3724 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3725 zil_commit(zilog, 0);
3730 EXPORT_SYMBOL(zfs_symlink);
3733 * Return, in the buffer contained in the provided uio structure,
3734 * the symbolic path referred to by ip.
3736 * IN: ip - inode of symbolic link
3737 * uio - structure to contain the link path.
3738 * cr - credentials of caller.
3740 * RETURN: 0 if success
3741 * error code if failure
3744 * ip - atime updated
3748 zfs_readlink(struct inode *ip, uio_t *uio, cred_t *cr)
3750 znode_t *zp = ITOZ(ip);
3751 zfs_sb_t *zsb = ITOZSB(ip);
3757 mutex_enter(&zp->z_lock);
3759 error = sa_lookup_uio(zp->z_sa_hdl,
3760 SA_ZPL_SYMLINK(zsb), uio);
3762 error = zfs_sa_readlink(zp, uio);
3763 mutex_exit(&zp->z_lock);
3768 EXPORT_SYMBOL(zfs_readlink);
3771 * Insert a new entry into directory tdip referencing sip.
3773 * IN: tdip - Directory to contain new entry.
3774 * sip - inode of new entry.
3775 * name - name of new entry.
3776 * cr - credentials of caller.
3778 * RETURN: 0 if success
3779 * error code if failure
3782 * tdip - ctime|mtime updated
3783 * sip - ctime updated
3787 zfs_link(struct inode *tdip, struct inode *sip, char *name, cred_t *cr,
3790 znode_t *dzp = ITOZ(tdip);
3792 zfs_sb_t *zsb = ITOZSB(tdip);
3800 boolean_t waited = B_FALSE;
3802 ASSERT(S_ISDIR(tdip->i_mode));
3809 * POSIX dictates that we return EPERM here.
3810 * Better choices include ENOTSUP or EISDIR.
3812 if (S_ISDIR(sip->i_mode)) {
3814 return (SET_ERROR(EPERM));
3821 * We check i_sb because snapshots and the ctldir must have different
3824 if (sip->i_sb != tdip->i_sb || zfsctl_is_node(sip)) {
3826 return (SET_ERROR(EXDEV));
3829 /* Prevent links to .zfs/shares files */
3831 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zsb),
3832 &parent, sizeof (uint64_t))) != 0) {
3836 if (parent == zsb->z_shares_dir) {
3838 return (SET_ERROR(EPERM));
3841 if (zsb->z_utf8 && u8_validate(name,
3842 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3844 return (SET_ERROR(EILSEQ));
3846 if (flags & FIGNORECASE)
3850 * We do not support links between attributes and non-attributes
3851 * because of the potential security risk of creating links
3852 * into "normal" file space in order to circumvent restrictions
3853 * imposed in attribute space.
3855 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) {
3857 return (SET_ERROR(EINVAL));
3860 owner = zfs_fuid_map_id(zsb, KUID_TO_SUID(sip->i_uid), cr, ZFS_OWNER);
3861 if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
3863 return (SET_ERROR(EPERM));
3866 if ((error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr))) {
3873 * Attempt to lock directory; fail if entry already exists.
3875 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL);
3881 tx = dmu_tx_create(zsb->z_os);
3882 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3883 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
3884 zfs_sa_upgrade_txholds(tx, szp);
3885 zfs_sa_upgrade_txholds(tx, dzp);
3886 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3888 zfs_dirent_unlock(dl);
3889 if (error == ERESTART) {
3900 error = zfs_link_create(dl, szp, tx, 0);
3903 uint64_t txtype = TX_LINK;
3904 if (flags & FIGNORECASE)
3906 zfs_log_link(zilog, tx, txtype, dzp, szp, name);
3911 zfs_dirent_unlock(dl);
3913 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
3914 zil_commit(zilog, 0);
3916 zfs_inode_update(dzp);
3917 zfs_inode_update(szp);
3921 EXPORT_SYMBOL(zfs_link);
3924 zfs_putpage_commit_cb(void *arg)
3926 struct page *pp = arg;
3929 end_page_writeback(pp);
3933 * Push a page out to disk, once the page is on stable storage the
3934 * registered commit callback will be run as notification of completion.
3936 * IN: ip - page mapped for inode.
3937 * pp - page to push (page is locked)
3938 * wbc - writeback control data
3940 * RETURN: 0 if success
3941 * error code if failure
3944 * ip - ctime|mtime updated
3948 zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc)
3950 znode_t *zp = ITOZ(ip);
3951 zfs_sb_t *zsb = ITOZSB(ip);
3959 uint64_t mtime[2], ctime[2];
3960 sa_bulk_attr_t bulk[3];
3962 struct address_space *mapping;
3967 ASSERT(PageLocked(pp));
3969 pgoff = page_offset(pp); /* Page byte-offset in file */
3970 offset = i_size_read(ip); /* File length in bytes */
3971 pglen = MIN(PAGE_SIZE, /* Page length in bytes */
3972 P2ROUNDUP(offset, PAGE_SIZE)-pgoff);
3974 /* Page is beyond end of file */
3975 if (pgoff >= offset) {
3981 /* Truncate page length to end of file */
3982 if (pgoff + pglen > offset)
3983 pglen = offset - pgoff;
3987 * FIXME: Allow mmap writes past its quota. The correct fix
3988 * is to register a page_mkwrite() handler to count the page
3989 * against its quota when it is about to be dirtied.
3991 if (zfs_owner_overquota(zsb, zp, B_FALSE) ||
3992 zfs_owner_overquota(zsb, zp, B_TRUE)) {
3998 * The ordering here is critical and must adhere to the following
3999 * rules in order to avoid deadlocking in either zfs_read() or
4000 * zfs_free_range() due to a lock inversion.
4002 * 1) The page must be unlocked prior to acquiring the range lock.
4003 * This is critical because zfs_read() calls find_lock_page()
4004 * which may block on the page lock while holding the range lock.
4006 * 2) Before setting or clearing write back on a page the range lock
4007 * must be held in order to prevent a lock inversion with the
4008 * zfs_free_range() function.
4010 * This presents a problem because upon entering this function the
4011 * page lock is already held. To safely acquire the range lock the
4012 * page lock must be dropped. This creates a window where another
4013 * process could truncate, invalidate, dirty, or write out the page.
4015 * Therefore, after successfully reacquiring the range and page locks
4016 * the current page state is checked. In the common case everything
4017 * will be as is expected and it can be written out. However, if
4018 * the page state has changed it must be handled accordingly.
4020 mapping = pp->mapping;
4021 redirty_page_for_writepage(wbc, pp);
4024 rl = zfs_range_lock(&zp->z_range_lock, pgoff, pglen, RL_WRITER);
4027 /* Page mapping changed or it was no longer dirty, we're done */
4028 if (unlikely((mapping != pp->mapping) || !PageDirty(pp))) {
4030 zfs_range_unlock(rl);
4035 /* Another process started write block if required */
4036 if (PageWriteback(pp)) {
4038 zfs_range_unlock(rl);
4040 if (wbc->sync_mode != WB_SYNC_NONE)
4041 wait_on_page_writeback(pp);
4047 /* Clear the dirty flag the required locks are held */
4048 if (!clear_page_dirty_for_io(pp)) {
4050 zfs_range_unlock(rl);
4056 * Counterpart for redirty_page_for_writepage() above. This page
4057 * was in fact not skipped and should not be counted as if it were.
4059 wbc->pages_skipped--;
4060 set_page_writeback(pp);
4063 tx = dmu_tx_create(zsb->z_os);
4064 dmu_tx_hold_write(tx, zp->z_id, pgoff, pglen);
4065 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4066 zfs_sa_upgrade_txholds(tx, zp);
4068 err = dmu_tx_assign(tx, TXG_NOWAIT);
4070 if (err == ERESTART)
4074 __set_page_dirty_nobuffers(pp);
4076 end_page_writeback(pp);
4077 zfs_range_unlock(rl);
4083 ASSERT3U(pglen, <=, PAGE_SIZE);
4084 dmu_write(zsb->z_os, zp->z_id, pgoff, pglen, va, tx);
4087 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
4088 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
4089 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_FLAGS(zsb), NULL, &zp->z_pflags, 8);
4091 /* Preserve the mtime and ctime provided by the inode */
4092 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4093 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4094 zp->z_atime_dirty = 0;
4097 err = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4099 zfs_log_write(zsb->z_log, tx, TX_WRITE, zp, pgoff, pglen, 0,
4100 zfs_putpage_commit_cb, pp);
4103 zfs_range_unlock(rl);
4105 if (wbc->sync_mode != WB_SYNC_NONE) {
4107 * Note that this is rarely called under writepages(), because
4108 * writepages() normally handles the entire commit for
4109 * performance reasons.
4111 if (zsb->z_log != NULL)
4112 zil_commit(zsb->z_log, zp->z_id);
4120 * Update the system attributes when the inode has been dirtied. For the
4121 * moment we only update the mode, atime, mtime, and ctime.
4124 zfs_dirty_inode(struct inode *ip, int flags)
4126 znode_t *zp = ITOZ(ip);
4127 zfs_sb_t *zsb = ITOZSB(ip);
4129 uint64_t mode, atime[2], mtime[2], ctime[2];
4130 sa_bulk_attr_t bulk[4];
4134 if (zfs_is_readonly(zsb) || dmu_objset_is_snapshot(zsb->z_os))
4142 * This is the lazytime semantic indroduced in Linux 4.0
4143 * This flag will only be called from update_time when lazytime is set.
4144 * (Note, I_DIRTY_SYNC will also set if not lazytime)
4145 * Fortunately mtime and ctime are managed within ZFS itself, so we
4146 * only need to dirty atime.
4148 if (flags == I_DIRTY_TIME) {
4149 zp->z_atime_dirty = 1;
4154 tx = dmu_tx_create(zsb->z_os);
4156 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4157 zfs_sa_upgrade_txholds(tx, zp);
4159 error = dmu_tx_assign(tx, TXG_WAIT);
4165 mutex_enter(&zp->z_lock);
4166 zp->z_atime_dirty = 0;
4168 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MODE(zsb), NULL, &mode, 8);
4169 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_ATIME(zsb), NULL, &atime, 16);
4170 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
4171 SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
4173 /* Preserve the mode, mtime and ctime provided by the inode */
4174 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4175 ZFS_TIME_ENCODE(&ip->i_mtime, mtime);
4176 ZFS_TIME_ENCODE(&ip->i_ctime, ctime);
4181 error = sa_bulk_update(zp->z_sa_hdl, bulk, cnt, tx);
4182 mutex_exit(&zp->z_lock);
4189 EXPORT_SYMBOL(zfs_dirty_inode);
4193 zfs_inactive(struct inode *ip)
4195 znode_t *zp = ITOZ(ip);
4196 zfs_sb_t *zsb = ITOZSB(ip);
4199 int need_unlock = 0;
4201 /* Only read lock if we haven't already write locked, e.g. rollback */
4202 if (!RW_WRITE_HELD(&zsb->z_teardown_inactive_lock)) {
4204 rw_enter(&zsb->z_teardown_inactive_lock, RW_READER);
4206 if (zp->z_sa_hdl == NULL) {
4208 rw_exit(&zsb->z_teardown_inactive_lock);
4212 if (zp->z_atime_dirty && zp->z_unlinked == 0) {
4213 dmu_tx_t *tx = dmu_tx_create(zsb->z_os);
4215 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4216 zfs_sa_upgrade_txholds(tx, zp);
4217 error = dmu_tx_assign(tx, TXG_WAIT);
4221 ZFS_TIME_ENCODE(&ip->i_atime, atime);
4222 mutex_enter(&zp->z_lock);
4223 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zsb),
4224 (void *)&atime, sizeof (atime), tx);
4225 zp->z_atime_dirty = 0;
4226 mutex_exit(&zp->z_lock);
4233 rw_exit(&zsb->z_teardown_inactive_lock);
4235 EXPORT_SYMBOL(zfs_inactive);
4238 * Bounds-check the seek operation.
4240 * IN: ip - inode seeking within
4241 * ooff - old file offset
4242 * noffp - pointer to new file offset
4243 * ct - caller context
4245 * RETURN: 0 if success
4246 * EINVAL if new offset invalid
4250 zfs_seek(struct inode *ip, offset_t ooff, offset_t *noffp)
4252 if (S_ISDIR(ip->i_mode))
4254 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
4256 EXPORT_SYMBOL(zfs_seek);
4259 * Fill pages with data from the disk.
4262 zfs_fillpage(struct inode *ip, struct page *pl[], int nr_pages)
4264 znode_t *zp = ITOZ(ip);
4265 zfs_sb_t *zsb = ITOZSB(ip);
4267 struct page *cur_pp;
4268 u_offset_t io_off, total;
4275 io_len = nr_pages << PAGE_SHIFT;
4276 i_size = i_size_read(ip);
4277 io_off = page_offset(pl[0]);
4279 if (io_off + io_len > i_size)
4280 io_len = i_size - io_off;
4283 * Iterate over list of pages and read each page individually.
4286 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
4289 cur_pp = pl[page_idx++];
4291 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
4295 /* convert checksum errors into IO errors */
4297 err = SET_ERROR(EIO);
4306 * Uses zfs_fillpage to read data from the file and fill the pages.
4308 * IN: ip - inode of file to get data from.
4309 * pl - list of pages to read
4310 * nr_pages - number of pages to read
4312 * RETURN: 0 on success, error code on failure.
4315 * vp - atime updated
4319 zfs_getpage(struct inode *ip, struct page *pl[], int nr_pages)
4321 znode_t *zp = ITOZ(ip);
4322 zfs_sb_t *zsb = ITOZSB(ip);
4331 err = zfs_fillpage(ip, pl, nr_pages);
4336 EXPORT_SYMBOL(zfs_getpage);
4339 * Check ZFS specific permissions to memory map a section of a file.
4341 * IN: ip - inode of the file to mmap
4343 * addrp - start address in memory region
4344 * len - length of memory region
4345 * vm_flags- address flags
4347 * RETURN: 0 if success
4348 * error code if failure
4352 zfs_map(struct inode *ip, offset_t off, caddr_t *addrp, size_t len,
4353 unsigned long vm_flags)
4355 znode_t *zp = ITOZ(ip);
4356 zfs_sb_t *zsb = ITOZSB(ip);
4361 if ((vm_flags & VM_WRITE) && (zp->z_pflags &
4362 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
4364 return (SET_ERROR(EPERM));
4367 if ((vm_flags & (VM_READ | VM_EXEC)) &&
4368 (zp->z_pflags & ZFS_AV_QUARANTINED)) {
4370 return (SET_ERROR(EACCES));
4373 if (off < 0 || len > MAXOFFSET_T - off) {
4375 return (SET_ERROR(ENXIO));
4381 EXPORT_SYMBOL(zfs_map);
4384 * convoff - converts the given data (start, whence) to the
4388 convoff(struct inode *ip, flock64_t *lckdat, int whence, offset_t offset)
4393 if ((lckdat->l_whence == 2) || (whence == 2)) {
4394 if ((error = zfs_getattr(ip, &vap, 0, CRED()) != 0))
4398 switch (lckdat->l_whence) {
4400 lckdat->l_start += offset;
4403 lckdat->l_start += vap.va_size;
4408 return (SET_ERROR(EINVAL));
4411 if (lckdat->l_start < 0)
4412 return (SET_ERROR(EINVAL));
4416 lckdat->l_start -= offset;
4419 lckdat->l_start -= vap.va_size;
4424 return (SET_ERROR(EINVAL));
4427 lckdat->l_whence = (short)whence;
4432 * Free or allocate space in a file. Currently, this function only
4433 * supports the `F_FREESP' command. However, this command is somewhat
4434 * misnamed, as its functionality includes the ability to allocate as
4435 * well as free space.
4437 * IN: ip - inode of file to free data in.
4438 * cmd - action to take (only F_FREESP supported).
4439 * bfp - section of file to free/alloc.
4440 * flag - current file open mode flags.
4441 * offset - current file offset.
4442 * cr - credentials of caller [UNUSED].
4444 * RETURN: 0 on success, error code on failure.
4447 * ip - ctime|mtime updated
4451 zfs_space(struct inode *ip, int cmd, flock64_t *bfp, int flag,
4452 offset_t offset, cred_t *cr)
4454 znode_t *zp = ITOZ(ip);
4455 zfs_sb_t *zsb = ITOZSB(ip);
4462 if (cmd != F_FREESP) {
4464 return (SET_ERROR(EINVAL));
4468 * Callers might not be able to detect properly that we are read-only,
4469 * so check it explicitly here.
4471 if (zfs_is_readonly(zsb)) {
4473 return (SET_ERROR(EROFS));
4476 if ((error = convoff(ip, bfp, 0, offset))) {
4481 if (bfp->l_len < 0) {
4483 return (SET_ERROR(EINVAL));
4487 * Permissions aren't checked on Solaris because on this OS
4488 * zfs_space() can only be called with an opened file handle.
4489 * On Linux we can get here through truncate_range() which
4490 * operates directly on inodes, so we need to check access rights.
4492 if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr))) {
4498 len = bfp->l_len; /* 0 means from off to end of file */
4500 error = zfs_freesp(zp, off, len, flag, TRUE);
4505 EXPORT_SYMBOL(zfs_space);
4509 zfs_fid(struct inode *ip, fid_t *fidp)
4511 znode_t *zp = ITOZ(ip);
4512 zfs_sb_t *zsb = ITOZSB(ip);
4515 uint64_t object = zp->z_id;
4522 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zsb),
4523 &gen64, sizeof (uint64_t))) != 0) {
4528 gen = (uint32_t)gen64;
4530 size = (zsb->z_parent != zsb) ? LONG_FID_LEN : SHORT_FID_LEN;
4531 if (fidp->fid_len < size) {
4532 fidp->fid_len = size;
4534 return (SET_ERROR(ENOSPC));
4537 zfid = (zfid_short_t *)fidp;
4539 zfid->zf_len = size;
4541 for (i = 0; i < sizeof (zfid->zf_object); i++)
4542 zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
4544 /* Must have a non-zero generation number to distinguish from .zfs */
4547 for (i = 0; i < sizeof (zfid->zf_gen); i++)
4548 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
4550 if (size == LONG_FID_LEN) {
4551 uint64_t objsetid = dmu_objset_id(zsb->z_os);
4554 zlfid = (zfid_long_t *)fidp;
4556 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
4557 zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i));
4559 /* XXX - this should be the generation number for the objset */
4560 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
4561 zlfid->zf_setgen[i] = 0;
4567 EXPORT_SYMBOL(zfs_fid);
4571 zfs_getsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
4573 znode_t *zp = ITOZ(ip);
4574 zfs_sb_t *zsb = ITOZSB(ip);
4576 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
4580 error = zfs_getacl(zp, vsecp, skipaclchk, cr);
4585 EXPORT_SYMBOL(zfs_getsecattr);
4589 zfs_setsecattr(struct inode *ip, vsecattr_t *vsecp, int flag, cred_t *cr)
4591 znode_t *zp = ITOZ(ip);
4592 zfs_sb_t *zsb = ITOZSB(ip);
4594 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
4595 zilog_t *zilog = zsb->z_log;
4600 error = zfs_setacl(zp, vsecp, skipaclchk, cr);
4602 if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
4603 zil_commit(zilog, 0);
4608 EXPORT_SYMBOL(zfs_setsecattr);
4610 #ifdef HAVE_UIO_ZEROCOPY
4612 * Tunable, both must be a power of 2.
4614 * zcr_blksz_min: the smallest read we may consider to loan out an arcbuf
4615 * zcr_blksz_max: if set to less than the file block size, allow loaning out of
4616 * an arcbuf for a partial block read
4618 int zcr_blksz_min = (1 << 10); /* 1K */
4619 int zcr_blksz_max = (1 << 17); /* 128K */
4623 zfs_reqzcbuf(struct inode *ip, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr)
4625 znode_t *zp = ITOZ(ip);
4626 zfs_sb_t *zsb = ITOZSB(ip);
4627 int max_blksz = zsb->z_max_blksz;
4628 uio_t *uio = &xuio->xu_uio;
4629 ssize_t size = uio->uio_resid;
4630 offset_t offset = uio->uio_loffset;
4635 int preamble, postamble;
4637 if (xuio->xu_type != UIOTYPE_ZEROCOPY)
4638 return (SET_ERROR(EINVAL));
4645 * Loan out an arc_buf for write if write size is bigger than
4646 * max_blksz, and the file's block size is also max_blksz.
4649 if (size < blksz || zp->z_blksz != blksz) {
4651 return (SET_ERROR(EINVAL));
4654 * Caller requests buffers for write before knowing where the
4655 * write offset might be (e.g. NFS TCP write).
4660 preamble = P2PHASE(offset, blksz);
4662 preamble = blksz - preamble;
4667 postamble = P2PHASE(size, blksz);
4670 fullblk = size / blksz;
4671 (void) dmu_xuio_init(xuio,
4672 (preamble != 0) + fullblk + (postamble != 0));
4675 * Have to fix iov base/len for partial buffers. They
4676 * currently represent full arc_buf's.
4679 /* data begins in the middle of the arc_buf */
4680 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
4683 (void) dmu_xuio_add(xuio, abuf,
4684 blksz - preamble, preamble);
4687 for (i = 0; i < fullblk; i++) {
4688 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
4691 (void) dmu_xuio_add(xuio, abuf, 0, blksz);
4695 /* data ends in the middle of the arc_buf */
4696 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
4699 (void) dmu_xuio_add(xuio, abuf, 0, postamble);
4704 * Loan out an arc_buf for read if the read size is larger than
4705 * the current file block size. Block alignment is not
4706 * considered. Partial arc_buf will be loaned out for read.
4708 blksz = zp->z_blksz;
4709 if (blksz < zcr_blksz_min)
4710 blksz = zcr_blksz_min;
4711 if (blksz > zcr_blksz_max)
4712 blksz = zcr_blksz_max;
4713 /* avoid potential complexity of dealing with it */
4714 if (blksz > max_blksz) {
4716 return (SET_ERROR(EINVAL));
4719 maxsize = zp->z_size - uio->uio_loffset;
4725 return (SET_ERROR(EINVAL));
4730 return (SET_ERROR(EINVAL));
4733 uio->uio_extflg = UIO_XUIO;
4734 XUIO_XUZC_RW(xuio) = ioflag;
4741 zfs_retzcbuf(struct inode *ip, xuio_t *xuio, cred_t *cr)
4745 int ioflag = XUIO_XUZC_RW(xuio);
4747 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY);
4749 i = dmu_xuio_cnt(xuio);
4751 abuf = dmu_xuio_arcbuf(xuio, i);
4753 * if abuf == NULL, it must be a write buffer
4754 * that has been returned in zfs_write().
4757 dmu_return_arcbuf(abuf);
4758 ASSERT(abuf || ioflag == UIO_WRITE);
4761 dmu_xuio_fini(xuio);
4764 #endif /* HAVE_UIO_ZEROCOPY */
4766 #if defined(_KERNEL) && defined(HAVE_SPL)
4767 module_param(zfs_delete_blocks, ulong, 0644);
4768 MODULE_PARM_DESC(zfs_delete_blocks, "Delete files larger than N blocks async");
4769 module_param(zfs_read_chunk_size, long, 0644);
4770 MODULE_PARM_DESC(zfs_read_chunk_size, "Bytes to read per chunk");