2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "xfs_types.h"
24 #include "xfs_trans.h"
28 #include "xfs_mount.h"
29 #include "xfs_da_btree.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_ialloc_btree.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_inode_item.h"
35 #include "xfs_itable.h"
36 #include "xfs_ialloc.h"
37 #include "xfs_alloc.h"
41 #include "xfs_error.h"
42 #include "xfs_quota.h"
43 #include "xfs_utils.h"
44 #include "xfs_rtalloc.h"
45 #include "xfs_trans_space.h"
46 #include "xfs_log_priv.h"
47 #include "xfs_filestream.h"
48 #include "xfs_vnodeops.h"
49 #include "xfs_trace.h"
52 * The maximum pathlen is 1024 bytes. Since the minimum file system
53 * blocksize is 512 bytes, we can get a max of 2 extents back from
56 #define SYMLINK_MAPS 2
63 xfs_mount_t *mp = ip->i_mount;
64 int pathlen = ip->i_d.di_size;
65 int nmaps = SYMLINK_MAPS;
66 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
73 error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
78 for (n = 0; n < nmaps; n++) {
79 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
80 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
82 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0);
84 return XFS_ERROR(ENOMEM);
87 xfs_buf_ioerror_alert(bp, __func__);
91 if (pathlen < byte_cnt)
95 memcpy(link, bp->b_addr, byte_cnt);
99 link[ip->i_d.di_size] = '\0';
111 xfs_mount_t *mp = ip->i_mount;
115 trace_xfs_readlink(ip);
117 if (XFS_FORCED_SHUTDOWN(mp))
118 return XFS_ERROR(EIO);
120 xfs_ilock(ip, XFS_ILOCK_SHARED);
122 pathlen = ip->i_d.di_size;
126 if (pathlen < 0 || pathlen > MAXPATHLEN) {
127 xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
128 __func__, (unsigned long long) ip->i_ino,
129 (long long) pathlen);
131 error = XFS_ERROR(EFSCORRUPTED);
136 if (ip->i_df.if_flags & XFS_IFINLINE) {
137 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
138 link[pathlen] = '\0';
140 error = xfs_readlink_bmap(ip, link);
144 xfs_iunlock(ip, XFS_ILOCK_SHARED);
149 * Flags for xfs_free_eofblocks
151 #define XFS_FREE_EOF_TRYLOCK (1<<0)
154 * This is called by xfs_inactive to free any blocks beyond eof
155 * when the link count isn't zero and by xfs_dm_punch_hole() when
156 * punching a hole to EOF.
166 xfs_fileoff_t end_fsb;
167 xfs_fileoff_t last_fsb;
168 xfs_filblks_t map_len;
170 xfs_bmbt_irec_t imap;
173 * Figure out if there are any blocks beyond the end
174 * of the file. If not, then there is nothing to do.
176 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
177 last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
178 if (last_fsb <= end_fsb)
180 map_len = last_fsb - end_fsb;
183 xfs_ilock(ip, XFS_ILOCK_SHARED);
184 error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
185 xfs_iunlock(ip, XFS_ILOCK_SHARED);
187 if (!error && (nimaps != 0) &&
188 (imap.br_startblock != HOLESTARTBLOCK ||
189 ip->i_delayed_blks)) {
191 * Attach the dquots to the inode up front.
193 error = xfs_qm_dqattach(ip, 0);
198 * There are blocks after the end of file.
199 * Free them up now by truncating the file to
202 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
204 if (flags & XFS_FREE_EOF_TRYLOCK) {
205 if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
206 xfs_trans_cancel(tp, 0);
210 xfs_ilock(ip, XFS_IOLOCK_EXCL);
213 error = xfs_trans_reserve(tp, 0,
214 XFS_ITRUNCATE_LOG_RES(mp),
215 0, XFS_TRANS_PERM_LOG_RES,
216 XFS_ITRUNCATE_LOG_COUNT);
218 ASSERT(XFS_FORCED_SHUTDOWN(mp));
219 xfs_trans_cancel(tp, 0);
220 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
224 xfs_ilock(ip, XFS_ILOCK_EXCL);
225 xfs_trans_ijoin(tp, ip, 0);
228 * Do not update the on-disk file size. If we update the
229 * on-disk file size and then the system crashes before the
230 * contents of the file are flushed to disk then the files
231 * may be full of holes (ie NULL files bug).
233 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
237 * If we get an error at this point we simply don't
238 * bother truncating the file.
241 (XFS_TRANS_RELEASE_LOG_RES |
244 error = xfs_trans_commit(tp,
245 XFS_TRANS_RELEASE_LOG_RES);
247 xfs_iunlock(ip, XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL);
253 * Free a symlink that has blocks associated with it.
256 xfs_inactive_symlink_rmt(
264 xfs_fsblock_t first_block;
265 xfs_bmap_free_t free_list;
268 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
276 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
278 * We're freeing a symlink that has some
279 * blocks allocated to it. Free the
280 * blocks here. We know that we've got
281 * either 1 or 2 extents and that we can
282 * free them all in one bunmapi call.
284 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
287 * Lock the inode, fix the size, and join it to the transaction.
288 * Hold it so in the normal path, we still have it locked for
289 * the second transaction. In the error paths we need it
290 * held so the cancel won't rele it, see below.
292 size = (int)ip->i_d.di_size;
294 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
296 * Find the block(s) so we can inval and unmap them.
299 xfs_bmap_init(&free_list, &first_block);
300 nmaps = ARRAY_SIZE(mval);
301 error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
306 * Invalidate the block(s).
308 for (i = 0; i < nmaps; i++) {
309 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
310 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
311 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
316 xfs_trans_binval(tp, bp);
319 * Unmap the dead block(s) to the free_list.
321 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
322 &first_block, &free_list, &done)))
326 * Commit the first transaction. This logs the EFI and the inode.
328 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
331 * The transaction must have been committed, since there were
332 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
333 * The new tp has the extent freeing and EFDs.
337 * The first xact was committed, so add the inode to the new one.
338 * Mark it dirty so it will be logged and moved forward in the log as
339 * part of every commit.
341 xfs_trans_ijoin(tp, ip, 0);
342 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
344 * Get a new, empty transaction to return to our caller.
346 ntp = xfs_trans_dup(tp);
348 * Commit the transaction containing extent freeing and EFDs.
349 * If we get an error on the commit here or on the reserve below,
350 * we need to unlock the inode since the new transaction doesn't
351 * have the inode attached.
353 error = xfs_trans_commit(tp, 0);
356 ASSERT(XFS_FORCED_SHUTDOWN(mp));
360 * transaction commit worked ok so we can drop the extra ticket
361 * reference that we gained in xfs_trans_dup()
363 xfs_log_ticket_put(tp->t_ticket);
366 * Remove the memory for extent descriptions (just bookkeeping).
368 if (ip->i_df.if_bytes)
369 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
370 ASSERT(ip->i_df.if_bytes == 0);
372 * Put an itruncate log reservation in the new transaction
375 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
376 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
377 ASSERT(XFS_FORCED_SHUTDOWN(mp));
381 xfs_trans_ijoin(tp, ip, 0);
386 xfs_bmap_cancel(&free_list);
400 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
403 ASSERT(ip->i_d.di_forkoff != 0);
404 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
405 xfs_iunlock(ip, XFS_ILOCK_EXCL);
409 error = xfs_attr_inactive(ip);
413 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
414 error = xfs_trans_reserve(tp, 0,
415 XFS_IFREE_LOG_RES(mp),
416 0, XFS_TRANS_PERM_LOG_RES,
417 XFS_INACTIVE_LOG_COUNT);
421 xfs_ilock(ip, XFS_ILOCK_EXCL);
422 xfs_trans_ijoin(tp, ip, 0);
423 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
425 ASSERT(ip->i_d.di_anextents == 0);
431 ASSERT(XFS_FORCED_SHUTDOWN(mp));
432 xfs_trans_cancel(tp, 0);
435 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
443 xfs_mount_t *mp = ip->i_mount;
446 if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
449 /* If this is a read-only mount, don't do this (would generate I/O) */
450 if (mp->m_flags & XFS_MOUNT_RDONLY)
453 if (!XFS_FORCED_SHUTDOWN(mp)) {
457 * If we are using filestreams, and we have an unlinked
458 * file that we are processing the last close on, then nothing
459 * will be able to reopen and write to this file. Purge this
460 * inode from the filestreams cache so that it doesn't delay
461 * teardown of the inode.
463 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
464 xfs_filestream_deassociate(ip);
467 * If we previously truncated this file and removed old data
468 * in the process, we want to initiate "early" writeout on
469 * the last close. This is an attempt to combat the notorious
470 * NULL files problem which is particularly noticeable from a
471 * truncate down, buffered (re-)write (delalloc), followed by
472 * a crash. What we are effectively doing here is
473 * significantly reducing the time window where we'd otherwise
474 * be exposed to that problem.
476 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
478 xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
479 if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
480 xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
484 if (ip->i_d.di_nlink == 0)
487 if ((S_ISREG(ip->i_d.di_mode) &&
488 (VFS_I(ip)->i_size > 0 ||
489 (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
490 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
491 (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
494 * If we can't get the iolock just skip truncating the blocks
495 * past EOF because we could deadlock with the mmap_sem
496 * otherwise. We'll get another chance to drop them once the
497 * last reference to the inode is dropped, so we'll never leak
498 * blocks permanently.
500 * Further, check if the inode is being opened, written and
501 * closed frequently and we have delayed allocation blocks
502 * outstanding (e.g. streaming writes from the NFS server),
503 * truncating the blocks past EOF will cause fragmentation to
506 * In this case don't do the truncation, either, but we have to
507 * be careful how we detect this case. Blocks beyond EOF show
508 * up as i_delayed_blks even when the inode is clean, so we
509 * need to truncate them away first before checking for a dirty
510 * release. Hence on the first dirty close we will still remove
511 * the speculative allocation, but after that we will leave it
514 if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
517 error = xfs_free_eofblocks(mp, ip,
518 XFS_FREE_EOF_TRYLOCK);
522 /* delalloc blocks after truncation means it really is dirty */
523 if (ip->i_delayed_blks)
524 xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
532 * This is called when the vnode reference count for the vnode
533 * goes to zero. If the file has been unlinked, then it must
534 * now be truncated. Also, we clear all of the read-ahead state
535 * kept for the inode here since the file is now closed.
541 xfs_bmap_free_t free_list;
542 xfs_fsblock_t first_block;
550 * If the inode is already free, then there can be nothing
553 if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
554 ASSERT(ip->i_df.if_real_bytes == 0);
555 ASSERT(ip->i_df.if_broot_bytes == 0);
556 return VN_INACTIVE_CACHE;
563 /* If this is a read-only mount, don't do this (would generate I/O) */
564 if (mp->m_flags & XFS_MOUNT_RDONLY)
567 if (ip->i_d.di_nlink != 0) {
568 if ((S_ISREG(ip->i_d.di_mode) &&
569 (VFS_I(ip)->i_size > 0 ||
570 (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
571 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
572 (!(ip->i_d.di_flags &
573 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
574 ip->i_delayed_blks != 0))) {
575 error = xfs_free_eofblocks(mp, ip, 0);
577 return VN_INACTIVE_CACHE;
582 if (S_ISREG(ip->i_d.di_mode) &&
583 (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
584 ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0))
587 error = xfs_qm_dqattach(ip, 0);
589 return VN_INACTIVE_CACHE;
591 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
592 error = xfs_trans_reserve(tp, 0,
593 (truncate || S_ISLNK(ip->i_d.di_mode)) ?
594 XFS_ITRUNCATE_LOG_RES(mp) :
595 XFS_IFREE_LOG_RES(mp),
597 XFS_TRANS_PERM_LOG_RES,
598 XFS_ITRUNCATE_LOG_COUNT);
600 ASSERT(XFS_FORCED_SHUTDOWN(mp));
601 xfs_trans_cancel(tp, 0);
602 return VN_INACTIVE_CACHE;
605 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
606 xfs_trans_ijoin(tp, ip, 0);
608 if (S_ISLNK(ip->i_d.di_mode)) {
610 * Zero length symlinks _can_ exist.
612 if (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) {
613 error = xfs_inactive_symlink_rmt(ip, &tp);
616 } else if (ip->i_df.if_bytes > 0) {
617 xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
619 ASSERT(ip->i_df.if_bytes == 0);
621 } else if (truncate) {
623 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
625 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
629 ASSERT(ip->i_d.di_nextents == 0);
633 * If there are attributes associated with the file
634 * then blow them away now. The code calls a routine
635 * that recursively deconstructs the attribute fork.
636 * We need to just commit the current transaction
637 * because we can't use it for xfs_attr_inactive().
639 if (ip->i_d.di_anextents > 0) {
640 error = xfs_inactive_attrs(ip, &tp);
642 * If we got an error, the transaction is already
643 * cancelled, and the inode is unlocked. Just get out.
646 return VN_INACTIVE_CACHE;
647 } else if (ip->i_afp) {
648 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
654 xfs_bmap_init(&free_list, &first_block);
655 error = xfs_ifree(tp, ip, &free_list);
658 * If we fail to free the inode, shut down. The cancel
659 * might do that, we need to make sure. Otherwise the
660 * inode might be lost for a long time or forever.
662 if (!XFS_FORCED_SHUTDOWN(mp)) {
663 xfs_notice(mp, "%s: xfs_ifree returned error %d",
665 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
667 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
670 * Credit the quota account(s). The inode is gone.
672 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
675 * Just ignore errors at this point. There is nothing we can
676 * do except to try to keep going. Make sure it's not a silent
679 error = xfs_bmap_finish(&tp, &free_list, &committed);
681 xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
683 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
685 xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
690 * Release the dquots held by inode, if any.
693 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
696 return VN_INACTIVE_CACHE;
698 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
699 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
700 return VN_INACTIVE_CACHE;
704 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
705 * is allowed, otherwise it has to be an exact match. If a CI match is found,
706 * ci_name->name will point to a the actual name (caller must free) or
707 * will be set to NULL if an exact match is found.
712 struct xfs_name *name,
714 struct xfs_name *ci_name)
720 trace_xfs_lookup(dp, name);
722 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
723 return XFS_ERROR(EIO);
725 lock_mode = xfs_ilock_map_shared(dp);
726 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
727 xfs_iunlock_map_shared(dp, lock_mode);
732 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
740 kmem_free(ci_name->name);
749 struct xfs_name *name,
754 int is_dir = S_ISDIR(mode);
755 struct xfs_mount *mp = dp->i_mount;
756 struct xfs_inode *ip = NULL;
757 struct xfs_trans *tp = NULL;
759 xfs_bmap_free_t free_list;
760 xfs_fsblock_t first_block;
761 boolean_t unlock_dp_on_error = B_FALSE;
765 struct xfs_dquot *udqp = NULL;
766 struct xfs_dquot *gdqp = NULL;
771 trace_xfs_create(dp, name);
773 if (XFS_FORCED_SHUTDOWN(mp))
774 return XFS_ERROR(EIO);
776 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
777 prid = xfs_get_projid(dp);
779 prid = XFS_PROJID_DEFAULT;
782 * Make sure that we have allocated dquot(s) on disk.
784 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
785 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
791 resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
792 log_res = XFS_MKDIR_LOG_RES(mp);
793 log_count = XFS_MKDIR_LOG_COUNT;
794 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
796 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
797 log_res = XFS_CREATE_LOG_RES(mp);
798 log_count = XFS_CREATE_LOG_COUNT;
799 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
802 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
805 * Initially assume that the file does not exist and
806 * reserve the resources for that case. If that is not
807 * the case we'll drop the one we have and get a more
808 * appropriate transaction later.
810 error = xfs_trans_reserve(tp, resblks, log_res, 0,
811 XFS_TRANS_PERM_LOG_RES, log_count);
812 if (error == ENOSPC) {
813 /* flush outstanding delalloc blocks and retry */
814 xfs_flush_inodes(dp);
815 error = xfs_trans_reserve(tp, resblks, log_res, 0,
816 XFS_TRANS_PERM_LOG_RES, log_count);
818 if (error == ENOSPC) {
819 /* No space at all so try a "no-allocation" reservation */
821 error = xfs_trans_reserve(tp, 0, log_res, 0,
822 XFS_TRANS_PERM_LOG_RES, log_count);
826 goto out_trans_cancel;
829 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
830 unlock_dp_on_error = B_TRUE;
832 xfs_bmap_init(&free_list, &first_block);
835 * Reserve disk quota and the inode.
837 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
839 goto out_trans_cancel;
841 error = xfs_dir_canenter(tp, dp, name, resblks);
843 goto out_trans_cancel;
846 * A newly created regular or special file just has one directory
847 * entry pointing to them, but a directory also the "." entry
848 * pointing to itself.
850 error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
851 prid, resblks > 0, &ip, &committed);
854 goto out_trans_cancel;
855 goto out_trans_abort;
859 * Now we join the directory inode to the transaction. We do not do it
860 * earlier because xfs_dir_ialloc might commit the previous transaction
861 * (and release all the locks). An error from here on will result in
862 * the transaction cancel unlocking dp so don't do it explicitly in the
865 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
866 unlock_dp_on_error = B_FALSE;
868 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
869 &first_block, &free_list, resblks ?
870 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
872 ASSERT(error != ENOSPC);
873 goto out_trans_abort;
875 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
876 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
879 error = xfs_dir_init(tp, ip, dp);
881 goto out_bmap_cancel;
883 error = xfs_bumplink(tp, dp);
885 goto out_bmap_cancel;
889 * If this is a synchronous mount, make sure that the
890 * create transaction goes to disk before returning to
893 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
894 xfs_trans_set_sync(tp);
897 * Attach the dquot(s) to the inodes and modify them incore.
898 * These ids of the inode couldn't have changed since the new
899 * inode has been locked ever since it was created.
901 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
903 error = xfs_bmap_finish(&tp, &free_list, &committed);
905 goto out_bmap_cancel;
907 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
909 goto out_release_inode;
918 xfs_bmap_cancel(&free_list);
920 cancel_flags |= XFS_TRANS_ABORT;
922 xfs_trans_cancel(tp, cancel_flags);
925 * Wait until after the current transaction is aborted to
926 * release the inode. This prevents recursive transactions
927 * and deadlocks from xfs_inactive.
935 if (unlock_dp_on_error)
936 xfs_iunlock(dp, XFS_ILOCK_EXCL);
942 int xfs_small_retries;
943 int xfs_middle_retries;
944 int xfs_lots_retries;
949 * Bump the subclass so xfs_lock_inodes() acquires each lock with
953 xfs_lock_inumorder(int lock_mode, int subclass)
955 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
956 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
957 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
958 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
964 * The following routine will lock n inodes in exclusive mode.
965 * We assume the caller calls us with the inodes in i_ino order.
967 * We need to detect deadlock where an inode that we lock
968 * is in the AIL and we start waiting for another inode that is locked
969 * by a thread in a long running transaction (such as truncate). This can
970 * result in deadlock since the long running trans might need to wait
971 * for the inode we just locked in order to push the tail and free space
980 int attempts = 0, i, j, try_lock;
983 ASSERT(ips && (inodes >= 2)); /* we need at least two */
989 for (; i < inodes; i++) {
992 if (i && (ips[i] == ips[i-1])) /* Already locked */
996 * If try_lock is not set yet, make sure all locked inodes
997 * are not in the AIL.
998 * If any are, set try_lock to be used later.
1002 for (j = (i - 1); j >= 0 && !try_lock; j--) {
1003 lp = (xfs_log_item_t *)ips[j]->i_itemp;
1004 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1011 * If any of the previous locks we have locked is in the AIL,
1012 * we must TRY to get the second and subsequent locks. If
1013 * we can't get any, we must release all we have
1018 /* try_lock must be 0 if i is 0. */
1020 * try_lock means we have an inode locked
1021 * that is in the AIL.
1024 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
1028 * Unlock all previous guys and try again.
1029 * xfs_iunlock will try to push the tail
1030 * if the inode is in the AIL.
1033 for(j = i - 1; j >= 0; j--) {
1036 * Check to see if we've already
1037 * unlocked this one.
1038 * Not the first one going back,
1039 * and the inode ptr is the same.
1041 if ((j != (i - 1)) && ips[j] ==
1045 xfs_iunlock(ips[j], lock_mode);
1048 if ((attempts % 5) == 0) {
1049 delay(1); /* Don't just spin the CPU */
1059 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
1065 if (attempts < 5) xfs_small_retries++;
1066 else if (attempts < 100) xfs_middle_retries++;
1067 else xfs_lots_retries++;
1075 * xfs_lock_two_inodes() can only be used to lock one type of lock
1076 * at a time - the iolock or the ilock, but not both at once. If
1077 * we lock both at once, lockdep will report false positives saying
1078 * we have violated locking orders.
1081 xfs_lock_two_inodes(
1090 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1091 ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
1092 ASSERT(ip0->i_ino != ip1->i_ino);
1094 if (ip0->i_ino > ip1->i_ino) {
1101 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
1104 * If the first lock we have locked is in the AIL, we must TRY to get
1105 * the second lock. If we can't get it, we must release the first one
1108 lp = (xfs_log_item_t *)ip0->i_itemp;
1109 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1110 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
1111 xfs_iunlock(ip0, lock_mode);
1112 if ((++attempts % 5) == 0)
1113 delay(1); /* Don't just spin the CPU */
1117 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
1124 struct xfs_name *name,
1127 xfs_mount_t *mp = dp->i_mount;
1128 xfs_trans_t *tp = NULL;
1129 int is_dir = S_ISDIR(ip->i_d.di_mode);
1131 xfs_bmap_free_t free_list;
1132 xfs_fsblock_t first_block;
1139 trace_xfs_remove(dp, name);
1141 if (XFS_FORCED_SHUTDOWN(mp))
1142 return XFS_ERROR(EIO);
1144 error = xfs_qm_dqattach(dp, 0);
1148 error = xfs_qm_dqattach(ip, 0);
1153 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
1154 log_count = XFS_DEFAULT_LOG_COUNT;
1156 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
1157 log_count = XFS_REMOVE_LOG_COUNT;
1159 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1162 * We try to get the real space reservation first,
1163 * allowing for directory btree deletion(s) implying
1164 * possible bmap insert(s). If we can't get the space
1165 * reservation then we use 0 instead, and avoid the bmap
1166 * btree insert(s) in the directory code by, if the bmap
1167 * insert tries to happen, instead trimming the LAST
1168 * block from the directory.
1170 resblks = XFS_REMOVE_SPACE_RES(mp);
1171 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
1172 XFS_TRANS_PERM_LOG_RES, log_count);
1173 if (error == ENOSPC) {
1175 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
1176 XFS_TRANS_PERM_LOG_RES, log_count);
1179 ASSERT(error != ENOSPC);
1181 goto out_trans_cancel;
1184 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
1186 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1187 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1190 * If we're removing a directory perform some additional validation.
1193 ASSERT(ip->i_d.di_nlink >= 2);
1194 if (ip->i_d.di_nlink != 2) {
1195 error = XFS_ERROR(ENOTEMPTY);
1196 goto out_trans_cancel;
1198 if (!xfs_dir_isempty(ip)) {
1199 error = XFS_ERROR(ENOTEMPTY);
1200 goto out_trans_cancel;
1204 xfs_bmap_init(&free_list, &first_block);
1205 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
1206 &first_block, &free_list, resblks);
1208 ASSERT(error != ENOENT);
1209 goto out_bmap_cancel;
1211 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1215 * Drop the link from ip's "..".
1217 error = xfs_droplink(tp, dp);
1219 goto out_bmap_cancel;
1222 * Drop the "." link from ip to self.
1224 error = xfs_droplink(tp, ip);
1226 goto out_bmap_cancel;
1229 * When removing a non-directory we need to log the parent
1230 * inode here. For a directory this is done implicitly
1231 * by the xfs_droplink call for the ".." entry.
1233 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1237 * Drop the link from dp to ip.
1239 error = xfs_droplink(tp, ip);
1241 goto out_bmap_cancel;
1244 * Determine if this is the last link while
1245 * we are in the transaction.
1247 link_zero = (ip->i_d.di_nlink == 0);
1250 * If this is a synchronous mount, make sure that the
1251 * remove transaction goes to disk before returning to
1254 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1255 xfs_trans_set_sync(tp);
1257 error = xfs_bmap_finish(&tp, &free_list, &committed);
1259 goto out_bmap_cancel;
1261 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1266 * If we are using filestreams, kill the stream association.
1267 * If the file is still open it may get a new one but that
1268 * will get killed on last close in xfs_close() so we don't
1269 * have to worry about that.
1271 if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
1272 xfs_filestream_deassociate(ip);
1277 xfs_bmap_cancel(&free_list);
1278 cancel_flags |= XFS_TRANS_ABORT;
1280 xfs_trans_cancel(tp, cancel_flags);
1289 struct xfs_name *target_name)
1291 xfs_mount_t *mp = tdp->i_mount;
1294 xfs_bmap_free_t free_list;
1295 xfs_fsblock_t first_block;
1300 trace_xfs_link(tdp, target_name);
1302 ASSERT(!S_ISDIR(sip->i_d.di_mode));
1304 if (XFS_FORCED_SHUTDOWN(mp))
1305 return XFS_ERROR(EIO);
1307 error = xfs_qm_dqattach(sip, 0);
1311 error = xfs_qm_dqattach(tdp, 0);
1315 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
1316 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1317 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
1318 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
1319 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1320 if (error == ENOSPC) {
1322 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
1323 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1330 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
1332 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
1333 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
1336 * If we are using project inheritance, we only allow hard link
1337 * creation in our tree when the project IDs are the same; else
1338 * the tree quota mechanism could be circumvented.
1340 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1341 (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
1342 error = XFS_ERROR(EXDEV);
1346 error = xfs_dir_canenter(tp, tdp, target_name, resblks);
1350 xfs_bmap_init(&free_list, &first_block);
1352 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
1353 &first_block, &free_list, resblks);
1356 xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1357 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
1359 error = xfs_bumplink(tp, sip);
1364 * If this is a synchronous mount, make sure that the
1365 * link transaction goes to disk before returning to
1368 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1369 xfs_trans_set_sync(tp);
1372 error = xfs_bmap_finish (&tp, &free_list, &committed);
1374 xfs_bmap_cancel(&free_list);
1378 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1381 cancel_flags |= XFS_TRANS_ABORT;
1383 xfs_trans_cancel(tp, cancel_flags);
1391 struct xfs_name *link_name,
1392 const char *target_path,
1396 xfs_mount_t *mp = dp->i_mount;
1401 xfs_bmap_free_t free_list;
1402 xfs_fsblock_t first_block;
1403 boolean_t unlock_dp_on_error = B_FALSE;
1406 xfs_fileoff_t first_fsb;
1407 xfs_filblks_t fs_blocks;
1409 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1411 const char *cur_chunk;
1416 struct xfs_dquot *udqp, *gdqp;
1424 trace_xfs_symlink(dp, link_name);
1426 if (XFS_FORCED_SHUTDOWN(mp))
1427 return XFS_ERROR(EIO);
1430 * Check component lengths of the target path name.
1432 pathlen = strlen(target_path);
1433 if (pathlen >= MAXPATHLEN) /* total string too long */
1434 return XFS_ERROR(ENAMETOOLONG);
1437 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1438 prid = xfs_get_projid(dp);
1440 prid = XFS_PROJID_DEFAULT;
1443 * Make sure that we have allocated dquot(s) on disk.
1445 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
1446 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
1450 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
1451 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1453 * The symlink will fit into the inode data fork?
1454 * There can't be any attributes so we get the whole variable part.
1456 if (pathlen <= XFS_LITINO(mp))
1459 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
1460 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
1461 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
1462 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1463 if (error == ENOSPC && fs_blocks == 0) {
1465 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
1466 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1473 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
1474 unlock_dp_on_error = B_TRUE;
1477 * Check whether the directory allows new symlinks or not.
1479 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
1480 error = XFS_ERROR(EPERM);
1485 * Reserve disk quota : blocks and inode.
1487 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
1492 * Check for ability to enter directory entry, if no space reserved.
1494 error = xfs_dir_canenter(tp, dp, link_name, resblks);
1498 * Initialize the bmap freelist prior to calling either
1499 * bmapi or the directory create code.
1501 xfs_bmap_init(&free_list, &first_block);
1504 * Allocate an inode for the symlink.
1506 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
1507 prid, resblks > 0, &ip, NULL);
1509 if (error == ENOSPC)
1515 * An error after we've joined dp to the transaction will result in the
1516 * transaction cancel unlocking dp so don't do it explicitly in the
1519 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1520 unlock_dp_on_error = B_FALSE;
1523 * Also attach the dquot(s) to it, if applicable.
1525 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
1528 resblks -= XFS_IALLOC_SPACE_RES(mp);
1530 * If the symlink will fit into the inode, write it inline.
1532 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
1533 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
1534 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
1535 ip->i_d.di_size = pathlen;
1538 * The inode was initially created in extent format.
1540 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
1541 ip->i_df.if_flags |= XFS_IFINLINE;
1543 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
1544 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
1548 nmaps = SYMLINK_MAPS;
1550 error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
1551 XFS_BMAPI_METADATA, &first_block, resblks,
1552 mval, &nmaps, &free_list);
1557 resblks -= fs_blocks;
1558 ip->i_d.di_size = pathlen;
1559 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1561 cur_chunk = target_path;
1562 for (n = 0; n < nmaps; n++) {
1563 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
1564 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
1565 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
1566 BTOBB(byte_cnt), 0);
1571 if (pathlen < byte_cnt) {
1574 pathlen -= byte_cnt;
1576 memcpy(bp->b_addr, cur_chunk, byte_cnt);
1577 cur_chunk += byte_cnt;
1579 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
1584 * Create the directory entry for the symlink.
1586 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
1587 &first_block, &free_list, resblks);
1590 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1591 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1594 * If this is a synchronous mount, make sure that the
1595 * symlink transaction goes to disk before returning to
1598 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1599 xfs_trans_set_sync(tp);
1602 error = xfs_bmap_finish(&tp, &free_list, &committed);
1606 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1607 xfs_qm_dqrele(udqp);
1608 xfs_qm_dqrele(gdqp);
1616 xfs_bmap_cancel(&free_list);
1617 cancel_flags |= XFS_TRANS_ABORT;
1619 xfs_trans_cancel(tp, cancel_flags);
1620 xfs_qm_dqrele(udqp);
1621 xfs_qm_dqrele(gdqp);
1623 if (unlock_dp_on_error)
1624 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1635 xfs_mount_t *mp = ip->i_mount;
1639 if (!capable(CAP_SYS_ADMIN))
1640 return XFS_ERROR(EPERM);
1642 if (XFS_FORCED_SHUTDOWN(mp))
1643 return XFS_ERROR(EIO);
1645 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
1646 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
1648 xfs_trans_cancel(tp, 0);
1651 xfs_ilock(ip, XFS_ILOCK_EXCL);
1652 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1654 ip->i_d.di_dmevmask = evmask;
1655 ip->i_d.di_dmstate = state;
1657 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1658 error = xfs_trans_commit(tp, 0);
1664 * xfs_alloc_file_space()
1665 * This routine allocates disk space for the given file.
1667 * If alloc_type == 0, this request is for an ALLOCSP type
1668 * request which will change the file size. In this case, no
1669 * DMAPI event will be generated by the call. A TRUNCATE event
1670 * will be generated later by xfs_setattr.
1672 * If alloc_type != 0, this request is for a RESVSP type
1673 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1674 * lower block boundary byte address is less than the file's
1683 xfs_alloc_file_space(
1690 xfs_mount_t *mp = ip->i_mount;
1692 xfs_filblks_t allocated_fsb;
1693 xfs_filblks_t allocatesize_fsb;
1694 xfs_extlen_t extsz, temp;
1695 xfs_fileoff_t startoffset_fsb;
1696 xfs_fsblock_t firstfsb;
1701 xfs_bmbt_irec_t imaps[1], *imapp;
1702 xfs_bmap_free_t free_list;
1703 uint qblocks, resblks, resrtextents;
1707 trace_xfs_alloc_file_space(ip);
1709 if (XFS_FORCED_SHUTDOWN(mp))
1710 return XFS_ERROR(EIO);
1712 error = xfs_qm_dqattach(ip, 0);
1717 return XFS_ERROR(EINVAL);
1719 rt = XFS_IS_REALTIME_INODE(ip);
1720 extsz = xfs_get_extsz_hint(ip);
1725 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
1726 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
1729 * Allocate file space until done or until there is an error
1731 while (allocatesize_fsb && !error) {
1735 * Determine space reservations for data/realtime.
1737 if (unlikely(extsz)) {
1738 s = startoffset_fsb;
1741 e = startoffset_fsb + allocatesize_fsb;
1742 if ((temp = do_mod(startoffset_fsb, extsz)))
1744 if ((temp = do_mod(e, extsz)))
1748 e = allocatesize_fsb;
1752 * The transaction reservation is limited to a 32-bit block
1753 * count, hence we need to limit the number of blocks we are
1754 * trying to reserve to avoid an overflow. We can't allocate
1755 * more than @nimaps extents, and an extent is limited on disk
1756 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1758 resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
1760 resrtextents = qblocks = resblks;
1761 resrtextents /= mp->m_sb.sb_rextsize;
1762 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
1763 quota_flag = XFS_QMOPT_RES_RTBLKS;
1766 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
1767 quota_flag = XFS_QMOPT_RES_REGBLKS;
1771 * Allocate and setup the transaction.
1773 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
1774 error = xfs_trans_reserve(tp, resblks,
1775 XFS_WRITE_LOG_RES(mp), resrtextents,
1776 XFS_TRANS_PERM_LOG_RES,
1777 XFS_WRITE_LOG_COUNT);
1779 * Check for running out of space
1783 * Free the transaction structure.
1785 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
1786 xfs_trans_cancel(tp, 0);
1789 xfs_ilock(ip, XFS_ILOCK_EXCL);
1790 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
1795 xfs_trans_ijoin(tp, ip, 0);
1797 xfs_bmap_init(&free_list, &firstfsb);
1798 error = xfs_bmapi_write(tp, ip, startoffset_fsb,
1799 allocatesize_fsb, alloc_type, &firstfsb,
1800 0, imapp, &nimaps, &free_list);
1806 * Complete the transaction
1808 error = xfs_bmap_finish(&tp, &free_list, &committed);
1813 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1814 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1819 allocated_fsb = imapp->br_blockcount;
1822 error = XFS_ERROR(ENOSPC);
1826 startoffset_fsb += allocated_fsb;
1827 allocatesize_fsb -= allocated_fsb;
1832 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1833 xfs_bmap_cancel(&free_list);
1834 xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
1836 error1: /* Just cancel transaction */
1837 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1838 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1843 * Zero file bytes between startoff and endoff inclusive.
1844 * The iolock is held exclusive and no blocks are buffered.
1846 * This function is used by xfs_free_file_space() to zero
1847 * partial blocks when the range to free is not block aligned.
1848 * When unreserving space with boundaries that are not block
1849 * aligned we round up the start and round down the end
1850 * boundaries and then use this function to zero the parts of
1851 * the blocks that got dropped during the rounding.
1854 xfs_zero_remaining_bytes(
1859 xfs_bmbt_irec_t imap;
1860 xfs_fileoff_t offset_fsb;
1861 xfs_off_t lastoffset;
1864 xfs_mount_t *mp = ip->i_mount;
1869 * Avoid doing I/O beyond eof - it's not necessary
1870 * since nothing can read beyond eof. The space will
1871 * be zeroed when the file is extended anyway.
1873 if (startoff >= XFS_ISIZE(ip))
1876 if (endoff > XFS_ISIZE(ip))
1877 endoff = XFS_ISIZE(ip);
1879 bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
1880 mp->m_rtdev_targp : mp->m_ddev_targp,
1881 BTOBB(mp->m_sb.sb_blocksize), 0);
1883 return XFS_ERROR(ENOMEM);
1887 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
1888 offset_fsb = XFS_B_TO_FSBT(mp, offset);
1890 error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
1891 if (error || nimap < 1)
1893 ASSERT(imap.br_blockcount >= 1);
1894 ASSERT(imap.br_startoff == offset_fsb);
1895 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
1896 if (lastoffset > endoff)
1897 lastoffset = endoff;
1898 if (imap.br_startblock == HOLESTARTBLOCK)
1900 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
1901 if (imap.br_state == XFS_EXT_UNWRITTEN)
1904 XFS_BUF_UNWRITE(bp);
1906 XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
1908 error = xfs_buf_iowait(bp);
1910 xfs_buf_ioerror_alert(bp,
1911 "xfs_zero_remaining_bytes(read)");
1915 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
1916 0, lastoffset - offset + 1);
1921 error = xfs_buf_iowait(bp);
1923 xfs_buf_ioerror_alert(bp,
1924 "xfs_zero_remaining_bytes(write)");
1933 * xfs_free_file_space()
1934 * This routine frees disk space for the given file.
1936 * This routine is only called by xfs_change_file_space
1937 * for an UNRESVSP type call.
1945 xfs_free_file_space(
1953 xfs_fileoff_t endoffset_fsb;
1955 xfs_fsblock_t firstfsb;
1956 xfs_bmap_free_t free_list;
1957 xfs_bmbt_irec_t imap;
1965 xfs_fileoff_t startoffset_fsb;
1967 int need_iolock = 1;
1971 trace_xfs_free_file_space(ip);
1973 error = xfs_qm_dqattach(ip, 0);
1978 if (len <= 0) /* if nothing being freed */
1980 rt = XFS_IS_REALTIME_INODE(ip);
1981 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
1982 endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
1984 if (attr_flags & XFS_ATTR_NOLOCK)
1987 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1988 /* wait for the completion of any pending DIOs */
1989 inode_dio_wait(VFS_I(ip));
1992 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
1993 ioffset = offset & ~(rounding - 1);
1995 if (VN_CACHED(VFS_I(ip)) != 0) {
1996 error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
1998 goto out_unlock_iolock;
2002 * Need to zero the stuff we're not freeing, on disk.
2003 * If it's a realtime file & can't use unwritten extents then we
2004 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2005 * will take care of it for us.
2007 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
2009 error = xfs_bmapi_read(ip, startoffset_fsb, 1,
2012 goto out_unlock_iolock;
2013 ASSERT(nimap == 0 || nimap == 1);
2014 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2017 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2018 block = imap.br_startblock;
2019 mod = do_div(block, mp->m_sb.sb_rextsize);
2021 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
2024 error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
2027 goto out_unlock_iolock;
2028 ASSERT(nimap == 0 || nimap == 1);
2029 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2030 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2032 if (mod && (mod != mp->m_sb.sb_rextsize))
2033 endoffset_fsb -= mod;
2036 if ((done = (endoffset_fsb <= startoffset_fsb)))
2038 * One contiguous piece to clear
2040 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
2043 * Some full blocks, possibly two pieces to clear
2045 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
2046 error = xfs_zero_remaining_bytes(ip, offset,
2047 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
2049 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
2050 error = xfs_zero_remaining_bytes(ip,
2051 XFS_FSB_TO_B(mp, endoffset_fsb),
2056 * free file space until done or until there is an error
2058 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
2059 while (!error && !done) {
2062 * allocate and setup the transaction. Allow this
2063 * transaction to dip into the reserve blocks to ensure
2064 * the freeing of the space succeeds at ENOSPC.
2066 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
2067 tp->t_flags |= XFS_TRANS_RESERVE;
2068 error = xfs_trans_reserve(tp,
2070 XFS_WRITE_LOG_RES(mp),
2072 XFS_TRANS_PERM_LOG_RES,
2073 XFS_WRITE_LOG_COUNT);
2076 * check for running out of space
2080 * Free the transaction structure.
2082 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
2083 xfs_trans_cancel(tp, 0);
2086 xfs_ilock(ip, XFS_ILOCK_EXCL);
2087 error = xfs_trans_reserve_quota(tp, mp,
2088 ip->i_udquot, ip->i_gdquot,
2089 resblks, 0, XFS_QMOPT_RES_REGBLKS);
2093 xfs_trans_ijoin(tp, ip, 0);
2096 * issue the bunmapi() call to free the blocks
2098 xfs_bmap_init(&free_list, &firstfsb);
2099 error = xfs_bunmapi(tp, ip, startoffset_fsb,
2100 endoffset_fsb - startoffset_fsb,
2101 0, 2, &firstfsb, &free_list, &done);
2107 * complete the transaction
2109 error = xfs_bmap_finish(&tp, &free_list, &committed);
2114 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2115 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2120 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
2124 xfs_bmap_cancel(&free_list);
2126 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
2127 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
2133 * xfs_change_file_space()
2134 * This routine allocates or frees disk space for the given file.
2135 * The user specified parameters are checked for alignment and size
2144 xfs_change_file_space(
2151 xfs_mount_t *mp = ip->i_mount;
2156 xfs_off_t startoffset;
2162 if (!S_ISREG(ip->i_d.di_mode))
2163 return XFS_ERROR(EINVAL);
2165 switch (bf->l_whence) {
2166 case 0: /*SEEK_SET*/
2168 case 1: /*SEEK_CUR*/
2169 bf->l_start += offset;
2171 case 2: /*SEEK_END*/
2172 bf->l_start += XFS_ISIZE(ip);
2175 return XFS_ERROR(EINVAL);
2178 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
2180 if (bf->l_start < 0 ||
2181 bf->l_start > mp->m_super->s_maxbytes ||
2182 bf->l_start + llen < 0 ||
2183 bf->l_start + llen > mp->m_super->s_maxbytes)
2184 return XFS_ERROR(EINVAL);
2188 startoffset = bf->l_start;
2189 fsize = XFS_ISIZE(ip);
2192 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2194 * These calls do NOT zero the data space allocated to the file,
2195 * nor do they change the file size.
2197 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2199 * These calls cause the new file data to be zeroed and the file
2200 * size to be changed.
2202 setprealloc = clrprealloc = 0;
2203 prealloc_type = XFS_BMAPI_PREALLOC;
2206 case XFS_IOC_ZERO_RANGE:
2207 prealloc_type |= XFS_BMAPI_CONVERT;
2208 xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
2210 case XFS_IOC_RESVSP:
2211 case XFS_IOC_RESVSP64:
2212 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
2213 prealloc_type, attr_flags);
2219 case XFS_IOC_UNRESVSP:
2220 case XFS_IOC_UNRESVSP64:
2221 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
2226 case XFS_IOC_ALLOCSP:
2227 case XFS_IOC_ALLOCSP64:
2228 case XFS_IOC_FREESP:
2229 case XFS_IOC_FREESP64:
2231 * These operations actually do IO when extending the file, but
2232 * the allocation is done seperately to the zeroing that is
2233 * done. This set of operations need to be serialised against
2234 * other IO operations, such as truncate and buffered IO. We
2235 * need to take the IOLOCK here to serialise the allocation and
2236 * zeroing IO to prevent other IOLOCK holders (e.g. getbmap,
2237 * truncate, direct IO) from racing against the transient
2238 * allocated but not written state we can have here.
2240 xfs_ilock(ip, XFS_IOLOCK_EXCL);
2241 if (startoffset > fsize) {
2242 error = xfs_alloc_file_space(ip, fsize,
2243 startoffset - fsize, 0,
2244 attr_flags | XFS_ATTR_NOLOCK);
2246 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
2251 iattr.ia_valid = ATTR_SIZE;
2252 iattr.ia_size = startoffset;
2254 error = xfs_setattr_size(ip, &iattr,
2255 attr_flags | XFS_ATTR_NOLOCK);
2256 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
2266 return XFS_ERROR(EINVAL);
2270 * update the inode timestamp, mode, and prealloc flag bits
2272 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
2274 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
2277 xfs_trans_cancel(tp, 0);
2281 xfs_ilock(ip, XFS_ILOCK_EXCL);
2282 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2284 if ((attr_flags & XFS_ATTR_DMI) == 0) {
2285 ip->i_d.di_mode &= ~S_ISUID;
2288 * Note that we don't have to worry about mandatory
2289 * file locking being disabled here because we only
2290 * clear the S_ISGID bit if the Group execute bit is
2291 * on, but if it was on then mandatory locking wouldn't
2292 * have been enabled.
2294 if (ip->i_d.di_mode & S_IXGRP)
2295 ip->i_d.di_mode &= ~S_ISGID;
2297 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2300 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
2301 else if (clrprealloc)
2302 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
2304 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2305 if (attr_flags & XFS_ATTR_SYNC)
2306 xfs_trans_set_sync(tp);
2307 return xfs_trans_commit(tp, 0);