2 * Copyright (c) 2000-2005 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
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
25 #include "xfs_mount.h"
26 #include "xfs_da_format.h"
27 #include "xfs_da_btree.h"
28 #include "xfs_attr_sf.h"
29 #include "xfs_inode.h"
30 #include "xfs_alloc.h"
31 #include "xfs_trans.h"
32 #include "xfs_inode_item.h"
34 #include "xfs_bmap_util.h"
35 #include "xfs_bmap_btree.h"
37 #include "xfs_attr_leaf.h"
38 #include "xfs_attr_remote.h"
39 #include "xfs_error.h"
40 #include "xfs_quota.h"
41 #include "xfs_trans_space.h"
42 #include "xfs_trace.h"
47 * Provide the external interfaces to manage attribute lists.
50 /*========================================================================
51 * Function prototypes for the kernel.
52 *========================================================================*/
55 * Internal routines when attribute list fits inside the inode.
57 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
60 * Internal routines when attribute list is one block.
62 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
63 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
64 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
67 * Internal routines when attribute list is more than one block.
69 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
70 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
71 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
72 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
73 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
78 struct xfs_da_args *args,
80 const unsigned char *name,
87 memset(args, 0, sizeof(*args));
88 args->geo = dp->i_mount->m_attr_geo;
89 args->whichfork = XFS_ATTR_FORK;
93 args->namelen = strlen((const char *)name);
94 if (args->namelen >= MAXNAMELEN)
95 return -EFAULT; /* match IRIX behaviour */
97 args->hashval = xfs_da_hashname(args->name, args->namelen);
103 struct xfs_inode *ip)
105 if (!XFS_IFORK_Q(ip) ||
106 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
107 ip->i_d.di_anextents == 0))
112 /*========================================================================
113 * Overall external interface routines.
114 *========================================================================*/
118 struct xfs_inode *ip,
119 const unsigned char *name,
120 unsigned char *value,
124 struct xfs_da_args args;
128 XFS_STATS_INC(xs_attr_get);
130 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
133 if (!xfs_inode_hasattr(ip))
136 error = xfs_attr_args_init(&args, ip, name, flags);
141 args.valuelen = *valuelenp;
143 lock_mode = xfs_ilock_attr_map_shared(ip);
144 if (!xfs_inode_hasattr(ip))
146 else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
147 error = xfs_attr_shortform_getvalue(&args);
148 else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
149 error = xfs_attr_leaf_get(&args);
151 error = xfs_attr_node_get(&args);
152 xfs_iunlock(ip, lock_mode);
154 *valuelenp = args.valuelen;
155 return error == -EEXIST ? 0 : error;
159 * Calculate how many blocks we need for the new attribute,
163 struct xfs_da_args *args,
166 struct xfs_mount *mp = args->dp->i_mount;
171 * Determine space new attribute will use, and if it would be
172 * "local" or "remote" (note: local != inline).
174 size = xfs_attr_leaf_newentsize(args, local);
175 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
177 if (size > (args->geo->blksize / 2)) {
178 /* Double split possible */
183 * Out of line attribute, cannot double split, but
184 * make room for the attribute value itself.
186 uint dblocks = xfs_attr3_rmt_blocks(mp, args->valuelen);
188 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
196 struct xfs_inode *dp,
197 const unsigned char *name,
198 unsigned char *value,
202 struct xfs_mount *mp = dp->i_mount;
203 struct xfs_da_args args;
204 struct xfs_bmap_free flist;
205 struct xfs_trans_res tres;
206 xfs_fsblock_t firstblock;
207 int rsvd = (flags & ATTR_ROOT) != 0;
208 int error, err2, committed, local;
210 XFS_STATS_INC(xs_attr_set);
212 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
215 error = xfs_attr_args_init(&args, dp, name, flags);
220 args.valuelen = valuelen;
221 args.firstblock = &firstblock;
223 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
224 args.total = xfs_attr_calc_size(&args, &local);
226 error = xfs_qm_dqattach(dp, 0);
231 * If the inode doesn't have an attribute fork, add one.
232 * (inode must not be locked when we call this routine)
234 if (XFS_IFORK_Q(dp) == 0) {
235 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
236 XFS_ATTR_SF_ENTSIZE_BYNAME(args.namelen, valuelen);
238 error = xfs_bmap_add_attrfork(dp, sf_size, rsvd);
244 * Start our first transaction of the day.
246 * All future transactions during this code must be "chained" off
247 * this one via the trans_dup() call. All transactions will contain
248 * the inode, and the inode will always be marked with trans_ihold().
249 * Since the inode will be locked in all transactions, we must log
250 * the inode in every transaction to let it float upward through
253 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
256 * Root fork attributes can use reserved data blocks for this
257 * operation if necessary
261 args.trans->t_flags |= XFS_TRANS_RESERVE;
263 tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
264 M_RES(mp)->tr_attrsetrt.tr_logres * args.total;
265 tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
266 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
267 error = xfs_trans_reserve(args.trans, &tres, args.total, 0);
269 xfs_trans_cancel(args.trans, 0);
272 xfs_ilock(dp, XFS_ILOCK_EXCL);
274 error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
275 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
276 XFS_QMOPT_RES_REGBLKS);
278 xfs_iunlock(dp, XFS_ILOCK_EXCL);
279 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
283 xfs_trans_ijoin(args.trans, dp, 0);
286 * If the attribute list is non-existent or a shortform list,
287 * upgrade it to a single-leaf-block attribute list.
289 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
290 (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
291 dp->i_d.di_anextents == 0)) {
294 * Build initial attribute list (if required).
296 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
297 xfs_attr_shortform_create(&args);
300 * Try to add the attr to the attribute list in
303 error = xfs_attr_shortform_addname(&args);
304 if (error != -ENOSPC) {
306 * Commit the shortform mods, and we're done.
307 * NOTE: this is also the error path (EEXIST, etc).
309 ASSERT(args.trans != NULL);
312 * If this is a synchronous mount, make sure that
313 * the transaction goes to disk before returning
316 if (mp->m_flags & XFS_MOUNT_WSYNC)
317 xfs_trans_set_sync(args.trans);
319 if (!error && (flags & ATTR_KERNOTIME) == 0) {
320 xfs_trans_ichgtime(args.trans, dp,
323 err2 = xfs_trans_commit(args.trans,
324 XFS_TRANS_RELEASE_LOG_RES);
325 xfs_iunlock(dp, XFS_ILOCK_EXCL);
327 return error ? error : err2;
331 * It won't fit in the shortform, transform to a leaf block.
332 * GROT: another possible req'mt for a double-split btree op.
334 xfs_bmap_init(args.flist, args.firstblock);
335 error = xfs_attr_shortform_to_leaf(&args);
337 error = xfs_bmap_finish(&args.trans, args.flist,
343 xfs_bmap_cancel(&flist);
348 * bmap_finish() may have committed the last trans and started
349 * a new one. We need the inode to be in all transactions.
352 xfs_trans_ijoin(args.trans, dp, 0);
355 * Commit the leaf transformation. We'll need another (linked)
356 * transaction to add the new attribute to the leaf.
359 error = xfs_trans_roll(&args.trans, dp);
365 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
366 error = xfs_attr_leaf_addname(&args);
368 error = xfs_attr_node_addname(&args);
373 * If this is a synchronous mount, make sure that the
374 * transaction goes to disk before returning to the user.
376 if (mp->m_flags & XFS_MOUNT_WSYNC)
377 xfs_trans_set_sync(args.trans);
379 if ((flags & ATTR_KERNOTIME) == 0)
380 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
383 * Commit the last in the sequence of transactions.
385 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
386 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
387 xfs_iunlock(dp, XFS_ILOCK_EXCL);
393 xfs_trans_cancel(args.trans,
394 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
396 xfs_iunlock(dp, XFS_ILOCK_EXCL);
401 * Generic handler routine to remove a name from an attribute list.
402 * Transitions attribute list from Btree to shortform as necessary.
406 struct xfs_inode *dp,
407 const unsigned char *name,
410 struct xfs_mount *mp = dp->i_mount;
411 struct xfs_da_args args;
412 struct xfs_bmap_free flist;
413 xfs_fsblock_t firstblock;
416 XFS_STATS_INC(xs_attr_remove);
418 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
421 if (!xfs_inode_hasattr(dp))
424 error = xfs_attr_args_init(&args, dp, name, flags);
428 args.firstblock = &firstblock;
432 * we have no control over the attribute names that userspace passes us
433 * to remove, so we have to allow the name lookup prior to attribute
436 args.op_flags = XFS_DA_OP_OKNOENT;
438 error = xfs_qm_dqattach(dp, 0);
443 * Start our first transaction of the day.
445 * All future transactions during this code must be "chained" off
446 * this one via the trans_dup() call. All transactions will contain
447 * the inode, and the inode will always be marked with trans_ihold().
448 * Since the inode will be locked in all transactions, we must log
449 * the inode in every transaction to let it float upward through
452 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
455 * Root fork attributes can use reserved data blocks for this
456 * operation if necessary
459 if (flags & ATTR_ROOT)
460 args.trans->t_flags |= XFS_TRANS_RESERVE;
462 error = xfs_trans_reserve(args.trans, &M_RES(mp)->tr_attrrm,
463 XFS_ATTRRM_SPACE_RES(mp), 0);
465 xfs_trans_cancel(args.trans, 0);
469 xfs_ilock(dp, XFS_ILOCK_EXCL);
471 * No need to make quota reservations here. We expect to release some
472 * blocks not allocate in the common case.
474 xfs_trans_ijoin(args.trans, dp, 0);
476 if (!xfs_inode_hasattr(dp)) {
478 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
479 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
480 error = xfs_attr_shortform_remove(&args);
481 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
482 error = xfs_attr_leaf_removename(&args);
484 error = xfs_attr_node_removename(&args);
491 * If this is a synchronous mount, make sure that the
492 * transaction goes to disk before returning to the user.
494 if (mp->m_flags & XFS_MOUNT_WSYNC)
495 xfs_trans_set_sync(args.trans);
497 if ((flags & ATTR_KERNOTIME) == 0)
498 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
501 * Commit the last in the sequence of transactions.
503 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
504 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
505 xfs_iunlock(dp, XFS_ILOCK_EXCL);
511 xfs_trans_cancel(args.trans,
512 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
514 xfs_iunlock(dp, XFS_ILOCK_EXCL);
518 /*========================================================================
519 * External routines when attribute list is inside the inode
520 *========================================================================*/
523 * Add a name to the shortform attribute list structure
524 * This is the external routine.
527 xfs_attr_shortform_addname(xfs_da_args_t *args)
529 int newsize, forkoff, retval;
531 trace_xfs_attr_sf_addname(args);
533 retval = xfs_attr_shortform_lookup(args);
534 if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
536 } else if (retval == -EEXIST) {
537 if (args->flags & ATTR_CREATE)
539 retval = xfs_attr_shortform_remove(args);
543 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
544 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
547 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
548 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
550 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
554 xfs_attr_shortform_add(args, forkoff);
559 /*========================================================================
560 * External routines when attribute list is one block
561 *========================================================================*/
564 * Add a name to the leaf attribute list structure
566 * This leaf block cannot have a "remote" value, we only call this routine
567 * if bmap_one_block() says there is only one block (ie: no remote blks).
570 xfs_attr_leaf_addname(xfs_da_args_t *args)
574 int retval, error, committed, forkoff;
576 trace_xfs_attr_leaf_addname(args);
579 * Read the (only) block in the attribute list in.
583 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
588 * Look up the given attribute in the leaf block. Figure out if
589 * the given flags produce an error or call for an atomic rename.
591 retval = xfs_attr3_leaf_lookup_int(bp, args);
592 if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
593 xfs_trans_brelse(args->trans, bp);
595 } else if (retval == -EEXIST) {
596 if (args->flags & ATTR_CREATE) { /* pure create op */
597 xfs_trans_brelse(args->trans, bp);
601 trace_xfs_attr_leaf_replace(args);
603 /* save the attribute state for later removal*/
604 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
605 args->blkno2 = args->blkno; /* set 2nd entry info*/
606 args->index2 = args->index;
607 args->rmtblkno2 = args->rmtblkno;
608 args->rmtblkcnt2 = args->rmtblkcnt;
609 args->rmtvaluelen2 = args->rmtvaluelen;
612 * clear the remote attr state now that it is saved so that the
613 * values reflect the state of the attribute we are about to
614 * add, not the attribute we just found and will remove later.
618 args->rmtvaluelen = 0;
622 * Add the attribute to the leaf block, transitioning to a Btree
625 retval = xfs_attr3_leaf_add(bp, args);
626 if (retval == -ENOSPC) {
628 * Promote the attribute list to the Btree format, then
629 * Commit that transaction so that the node_addname() call
630 * can manage its own transactions.
632 xfs_bmap_init(args->flist, args->firstblock);
633 error = xfs_attr3_leaf_to_node(args);
635 error = xfs_bmap_finish(&args->trans, args->flist,
641 xfs_bmap_cancel(args->flist);
646 * bmap_finish() may have committed the last trans and started
647 * a new one. We need the inode to be in all transactions.
650 xfs_trans_ijoin(args->trans, dp, 0);
653 * Commit the current trans (including the inode) and start
656 error = xfs_trans_roll(&args->trans, dp);
661 * Fob the whole rest of the problem off on the Btree code.
663 error = xfs_attr_node_addname(args);
668 * Commit the transaction that added the attr name so that
669 * later routines can manage their own transactions.
671 error = xfs_trans_roll(&args->trans, dp);
676 * If there was an out-of-line value, allocate the blocks we
677 * identified for its storage and copy the value. This is done
678 * after we create the attribute so that we don't overflow the
679 * maximum size of a transaction and/or hit a deadlock.
681 if (args->rmtblkno > 0) {
682 error = xfs_attr_rmtval_set(args);
688 * If this is an atomic rename operation, we must "flip" the
689 * incomplete flags on the "new" and "old" attribute/value pairs
690 * so that one disappears and one appears atomically. Then we
691 * must remove the "old" attribute/value pair.
693 if (args->op_flags & XFS_DA_OP_RENAME) {
695 * In a separate transaction, set the incomplete flag on the
696 * "old" attr and clear the incomplete flag on the "new" attr.
698 error = xfs_attr3_leaf_flipflags(args);
703 * Dismantle the "old" attribute/value pair by removing
704 * a "remote" value (if it exists).
706 args->index = args->index2;
707 args->blkno = args->blkno2;
708 args->rmtblkno = args->rmtblkno2;
709 args->rmtblkcnt = args->rmtblkcnt2;
710 args->rmtvaluelen = args->rmtvaluelen2;
711 if (args->rmtblkno) {
712 error = xfs_attr_rmtval_remove(args);
718 * Read in the block containing the "old" attr, then
719 * remove the "old" attr from that block (neat, huh!)
721 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno,
726 xfs_attr3_leaf_remove(bp, args);
729 * If the result is small enough, shrink it all into the inode.
731 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
732 xfs_bmap_init(args->flist, args->firstblock);
733 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
734 /* bp is gone due to xfs_da_shrink_inode */
736 error = xfs_bmap_finish(&args->trans,
743 xfs_bmap_cancel(args->flist);
748 * bmap_finish() may have committed the last trans
749 * and started a new one. We need the inode to be
750 * in all transactions.
753 xfs_trans_ijoin(args->trans, dp, 0);
757 * Commit the remove and start the next trans in series.
759 error = xfs_trans_roll(&args->trans, dp);
761 } else if (args->rmtblkno > 0) {
763 * Added a "remote" value, just clear the incomplete flag.
765 error = xfs_attr3_leaf_clearflag(args);
771 * Remove a name from the leaf attribute list structure
773 * This leaf block cannot have a "remote" value, we only call this routine
774 * if bmap_one_block() says there is only one block (ie: no remote blks).
777 xfs_attr_leaf_removename(xfs_da_args_t *args)
781 int error, committed, forkoff;
783 trace_xfs_attr_leaf_removename(args);
786 * Remove the attribute.
790 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
794 error = xfs_attr3_leaf_lookup_int(bp, args);
795 if (error == -ENOATTR) {
796 xfs_trans_brelse(args->trans, bp);
800 xfs_attr3_leaf_remove(bp, args);
803 * If the result is small enough, shrink it all into the inode.
805 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
806 xfs_bmap_init(args->flist, args->firstblock);
807 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
808 /* bp is gone due to xfs_da_shrink_inode */
810 error = xfs_bmap_finish(&args->trans, args->flist,
816 xfs_bmap_cancel(args->flist);
821 * bmap_finish() may have committed the last trans and started
822 * a new one. We need the inode to be in all transactions.
825 xfs_trans_ijoin(args->trans, dp, 0);
831 * Look up a name in a leaf attribute list structure.
833 * This leaf block cannot have a "remote" value, we only call this routine
834 * if bmap_one_block() says there is only one block (ie: no remote blks).
837 xfs_attr_leaf_get(xfs_da_args_t *args)
842 trace_xfs_attr_leaf_get(args);
845 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
849 error = xfs_attr3_leaf_lookup_int(bp, args);
850 if (error != -EEXIST) {
851 xfs_trans_brelse(args->trans, bp);
854 error = xfs_attr3_leaf_getvalue(bp, args);
855 xfs_trans_brelse(args->trans, bp);
856 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
857 error = xfs_attr_rmtval_get(args);
862 /*========================================================================
863 * External routines when attribute list size > geo->blksize
864 *========================================================================*/
867 * Add a name to a Btree-format attribute list.
869 * This will involve walking down the Btree, and may involve splitting
870 * leaf nodes and even splitting intermediate nodes up to and including
871 * the root node (a special case of an intermediate node).
873 * "Remote" attribute values confuse the issue and atomic rename operations
874 * add a whole extra layer of confusion on top of that.
877 xfs_attr_node_addname(xfs_da_args_t *args)
879 xfs_da_state_t *state;
880 xfs_da_state_blk_t *blk;
883 int committed, retval, error;
885 trace_xfs_attr_node_addname(args);
888 * Fill in bucket of arguments/results/context to carry around.
893 state = xfs_da_state_alloc();
898 * Search to see if name already exists, and get back a pointer
899 * to where it should go.
901 error = xfs_da3_node_lookup_int(state, &retval);
904 blk = &state->path.blk[ state->path.active-1 ];
905 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
906 if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
908 } else if (retval == -EEXIST) {
909 if (args->flags & ATTR_CREATE)
912 trace_xfs_attr_node_replace(args);
914 /* save the attribute state for later removal*/
915 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
916 args->blkno2 = args->blkno; /* set 2nd entry info*/
917 args->index2 = args->index;
918 args->rmtblkno2 = args->rmtblkno;
919 args->rmtblkcnt2 = args->rmtblkcnt;
920 args->rmtvaluelen2 = args->rmtvaluelen;
923 * clear the remote attr state now that it is saved so that the
924 * values reflect the state of the attribute we are about to
925 * add, not the attribute we just found and will remove later.
929 args->rmtvaluelen = 0;
932 retval = xfs_attr3_leaf_add(blk->bp, state->args);
933 if (retval == -ENOSPC) {
934 if (state->path.active == 1) {
936 * Its really a single leaf node, but it had
937 * out-of-line values so it looked like it *might*
938 * have been a b-tree.
940 xfs_da_state_free(state);
942 xfs_bmap_init(args->flist, args->firstblock);
943 error = xfs_attr3_leaf_to_node(args);
945 error = xfs_bmap_finish(&args->trans,
952 xfs_bmap_cancel(args->flist);
957 * bmap_finish() may have committed the last trans
958 * and started a new one. We need the inode to be
959 * in all transactions.
962 xfs_trans_ijoin(args->trans, dp, 0);
965 * Commit the node conversion and start the next
966 * trans in the chain.
968 error = xfs_trans_roll(&args->trans, dp);
976 * Split as many Btree elements as required.
977 * This code tracks the new and old attr's location
978 * in the index/blkno/rmtblkno/rmtblkcnt fields and
979 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
981 xfs_bmap_init(args->flist, args->firstblock);
982 error = xfs_da3_split(state);
984 error = xfs_bmap_finish(&args->trans, args->flist,
990 xfs_bmap_cancel(args->flist);
995 * bmap_finish() may have committed the last trans and started
996 * a new one. We need the inode to be in all transactions.
999 xfs_trans_ijoin(args->trans, dp, 0);
1002 * Addition succeeded, update Btree hashvals.
1004 xfs_da3_fixhashpath(state, &state->path);
1008 * Kill the state structure, we're done with it and need to
1009 * allow the buffers to come back later.
1011 xfs_da_state_free(state);
1015 * Commit the leaf addition or btree split and start the next
1016 * trans in the chain.
1018 error = xfs_trans_roll(&args->trans, dp);
1023 * If there was an out-of-line value, allocate the blocks we
1024 * identified for its storage and copy the value. This is done
1025 * after we create the attribute so that we don't overflow the
1026 * maximum size of a transaction and/or hit a deadlock.
1028 if (args->rmtblkno > 0) {
1029 error = xfs_attr_rmtval_set(args);
1035 * If this is an atomic rename operation, we must "flip" the
1036 * incomplete flags on the "new" and "old" attribute/value pairs
1037 * so that one disappears and one appears atomically. Then we
1038 * must remove the "old" attribute/value pair.
1040 if (args->op_flags & XFS_DA_OP_RENAME) {
1042 * In a separate transaction, set the incomplete flag on the
1043 * "old" attr and clear the incomplete flag on the "new" attr.
1045 error = xfs_attr3_leaf_flipflags(args);
1050 * Dismantle the "old" attribute/value pair by removing
1051 * a "remote" value (if it exists).
1053 args->index = args->index2;
1054 args->blkno = args->blkno2;
1055 args->rmtblkno = args->rmtblkno2;
1056 args->rmtblkcnt = args->rmtblkcnt2;
1057 args->rmtvaluelen = args->rmtvaluelen2;
1058 if (args->rmtblkno) {
1059 error = xfs_attr_rmtval_remove(args);
1065 * Re-find the "old" attribute entry after any split ops.
1066 * The INCOMPLETE flag means that we will find the "old"
1067 * attr, not the "new" one.
1069 args->flags |= XFS_ATTR_INCOMPLETE;
1070 state = xfs_da_state_alloc();
1074 error = xfs_da3_node_lookup_int(state, &retval);
1079 * Remove the name and update the hashvals in the tree.
1081 blk = &state->path.blk[ state->path.active-1 ];
1082 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1083 error = xfs_attr3_leaf_remove(blk->bp, args);
1084 xfs_da3_fixhashpath(state, &state->path);
1087 * Check to see if the tree needs to be collapsed.
1089 if (retval && (state->path.active > 1)) {
1090 xfs_bmap_init(args->flist, args->firstblock);
1091 error = xfs_da3_join(state);
1093 error = xfs_bmap_finish(&args->trans,
1100 xfs_bmap_cancel(args->flist);
1105 * bmap_finish() may have committed the last trans
1106 * and started a new one. We need the inode to be
1107 * in all transactions.
1110 xfs_trans_ijoin(args->trans, dp, 0);
1114 * Commit and start the next trans in the chain.
1116 error = xfs_trans_roll(&args->trans, dp);
1120 } else if (args->rmtblkno > 0) {
1122 * Added a "remote" value, just clear the incomplete flag.
1124 error = xfs_attr3_leaf_clearflag(args);
1132 xfs_da_state_free(state);
1139 * Remove a name from a B-tree attribute list.
1141 * This will involve walking down the Btree, and may involve joining
1142 * leaf nodes and even joining intermediate nodes up to and including
1143 * the root node (a special case of an intermediate node).
1146 xfs_attr_node_removename(xfs_da_args_t *args)
1148 xfs_da_state_t *state;
1149 xfs_da_state_blk_t *blk;
1152 int retval, error, committed, forkoff;
1154 trace_xfs_attr_node_removename(args);
1157 * Tie a string around our finger to remind us where we are.
1160 state = xfs_da_state_alloc();
1162 state->mp = dp->i_mount;
1165 * Search to see if name exists, and get back a pointer to it.
1167 error = xfs_da3_node_lookup_int(state, &retval);
1168 if (error || (retval != -EEXIST)) {
1175 * If there is an out-of-line value, de-allocate the blocks.
1176 * This is done before we remove the attribute so that we don't
1177 * overflow the maximum size of a transaction and/or hit a deadlock.
1179 blk = &state->path.blk[ state->path.active-1 ];
1180 ASSERT(blk->bp != NULL);
1181 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1182 if (args->rmtblkno > 0) {
1184 * Fill in disk block numbers in the state structure
1185 * so that we can get the buffers back after we commit
1186 * several transactions in the following calls.
1188 error = xfs_attr_fillstate(state);
1193 * Mark the attribute as INCOMPLETE, then bunmapi() the
1196 error = xfs_attr3_leaf_setflag(args);
1199 error = xfs_attr_rmtval_remove(args);
1204 * Refill the state structure with buffers, the prior calls
1205 * released our buffers.
1207 error = xfs_attr_refillstate(state);
1213 * Remove the name and update the hashvals in the tree.
1215 blk = &state->path.blk[ state->path.active-1 ];
1216 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1217 retval = xfs_attr3_leaf_remove(blk->bp, args);
1218 xfs_da3_fixhashpath(state, &state->path);
1221 * Check to see if the tree needs to be collapsed.
1223 if (retval && (state->path.active > 1)) {
1224 xfs_bmap_init(args->flist, args->firstblock);
1225 error = xfs_da3_join(state);
1227 error = xfs_bmap_finish(&args->trans, args->flist,
1233 xfs_bmap_cancel(args->flist);
1238 * bmap_finish() may have committed the last trans and started
1239 * a new one. We need the inode to be in all transactions.
1242 xfs_trans_ijoin(args->trans, dp, 0);
1245 * Commit the Btree join operation and start a new trans.
1247 error = xfs_trans_roll(&args->trans, dp);
1253 * If the result is small enough, push it all into the inode.
1255 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1257 * Have to get rid of the copy of this dabuf in the state.
1259 ASSERT(state->path.active == 1);
1260 ASSERT(state->path.blk[0].bp);
1261 state->path.blk[0].bp = NULL;
1263 error = xfs_attr3_leaf_read(args->trans, args->dp, 0, -1, &bp);
1267 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1268 xfs_bmap_init(args->flist, args->firstblock);
1269 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
1270 /* bp is gone due to xfs_da_shrink_inode */
1272 error = xfs_bmap_finish(&args->trans,
1279 xfs_bmap_cancel(args->flist);
1284 * bmap_finish() may have committed the last trans
1285 * and started a new one. We need the inode to be
1286 * in all transactions.
1289 xfs_trans_ijoin(args->trans, dp, 0);
1291 xfs_trans_brelse(args->trans, bp);
1296 xfs_da_state_free(state);
1301 * Fill in the disk block numbers in the state structure for the buffers
1302 * that are attached to the state structure.
1303 * This is done so that we can quickly reattach ourselves to those buffers
1304 * after some set of transaction commits have released these buffers.
1307 xfs_attr_fillstate(xfs_da_state_t *state)
1309 xfs_da_state_path_t *path;
1310 xfs_da_state_blk_t *blk;
1313 trace_xfs_attr_fillstate(state->args);
1316 * Roll down the "path" in the state structure, storing the on-disk
1317 * block number for those buffers in the "path".
1319 path = &state->path;
1320 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1321 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1323 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1326 blk->disk_blkno = 0;
1331 * Roll down the "altpath" in the state structure, storing the on-disk
1332 * block number for those buffers in the "altpath".
1334 path = &state->altpath;
1335 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1336 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1338 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1341 blk->disk_blkno = 0;
1349 * Reattach the buffers to the state structure based on the disk block
1350 * numbers stored in the state structure.
1351 * This is done after some set of transaction commits have released those
1352 * buffers from our grip.
1355 xfs_attr_refillstate(xfs_da_state_t *state)
1357 xfs_da_state_path_t *path;
1358 xfs_da_state_blk_t *blk;
1361 trace_xfs_attr_refillstate(state->args);
1364 * Roll down the "path" in the state structure, storing the on-disk
1365 * block number for those buffers in the "path".
1367 path = &state->path;
1368 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1369 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1370 if (blk->disk_blkno) {
1371 error = xfs_da3_node_read(state->args->trans,
1373 blk->blkno, blk->disk_blkno,
1374 &blk->bp, XFS_ATTR_FORK);
1383 * Roll down the "altpath" in the state structure, storing the on-disk
1384 * block number for those buffers in the "altpath".
1386 path = &state->altpath;
1387 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1388 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1389 if (blk->disk_blkno) {
1390 error = xfs_da3_node_read(state->args->trans,
1392 blk->blkno, blk->disk_blkno,
1393 &blk->bp, XFS_ATTR_FORK);
1405 * Look up a filename in a node attribute list.
1407 * This routine gets called for any attribute fork that has more than one
1408 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1409 * "remote" values taking up more blocks.
1412 xfs_attr_node_get(xfs_da_args_t *args)
1414 xfs_da_state_t *state;
1415 xfs_da_state_blk_t *blk;
1419 trace_xfs_attr_node_get(args);
1421 state = xfs_da_state_alloc();
1423 state->mp = args->dp->i_mount;
1426 * Search to see if name exists, and get back a pointer to it.
1428 error = xfs_da3_node_lookup_int(state, &retval);
1431 } else if (retval == -EEXIST) {
1432 blk = &state->path.blk[ state->path.active-1 ];
1433 ASSERT(blk->bp != NULL);
1434 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1437 * Get the value, local or "remote"
1439 retval = xfs_attr3_leaf_getvalue(blk->bp, args);
1440 if (!retval && (args->rmtblkno > 0)
1441 && !(args->flags & ATTR_KERNOVAL)) {
1442 retval = xfs_attr_rmtval_get(args);
1447 * If not in a transaction, we have to release all the buffers.
1449 for (i = 0; i < state->path.active; i++) {
1450 xfs_trans_brelse(args->trans, state->path.blk[i].bp);
1451 state->path.blk[i].bp = NULL;
1454 xfs_da_state_free(state);