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
21 #include "xfs_types.h"
24 #include "xfs_trans.h"
27 #include "xfs_mount.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_attr_sf.h"
31 #include "xfs_dinode.h"
32 #include "xfs_inode.h"
33 #include "xfs_alloc.h"
34 #include "xfs_inode_item.h"
37 #include "xfs_attr_leaf.h"
38 #include "xfs_error.h"
39 #include "xfs_quota.h"
40 #include "xfs_trans_space.h"
41 #include "xfs_vnodeops.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);
65 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
68 * Internal routines when attribute list is more than one block.
70 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
71 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
72 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
73 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
74 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
75 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
78 * Routines to manipulate out-of-line attribute values.
80 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
81 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
83 #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
86 xfs_attr_name_to_xname(
87 struct xfs_name *xname,
88 const unsigned char *aname)
93 xname->len = strlen((char *)aname);
94 if (xname->len >= MAXNAMELEN)
95 return EFAULT; /* match IRIX behaviour */
102 struct xfs_inode *ip)
104 if (!XFS_IFORK_Q(ip) ||
105 (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
106 ip->i_d.di_anextents == 0))
111 /*========================================================================
112 * Overall external interface routines.
113 *========================================================================*/
117 struct xfs_inode *ip,
118 struct xfs_name *name,
119 unsigned char *value,
126 if (!xfs_inode_hasattr(ip))
130 * Fill in the arg structure for this request.
132 memset((char *)&args, 0, sizeof(args));
133 args.name = name->name;
134 args.namelen = name->len;
136 args.valuelen = *valuelenp;
138 args.hashval = xfs_da_hashname(args.name, args.namelen);
140 args.whichfork = XFS_ATTR_FORK;
143 * Decide on what work routines to call based on the inode size.
145 if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
146 error = xfs_attr_shortform_getvalue(&args);
147 } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
148 error = xfs_attr_leaf_get(&args);
150 error = xfs_attr_node_get(&args);
154 * Return the number of bytes in the value to the caller.
156 *valuelenp = args.valuelen;
166 const unsigned char *name,
167 unsigned char *value,
172 struct xfs_name xname;
174 XFS_STATS_INC(xs_attr_get);
176 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
179 error = xfs_attr_name_to_xname(&xname, name);
183 xfs_ilock(ip, XFS_ILOCK_SHARED);
184 error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
185 xfs_iunlock(ip, XFS_ILOCK_SHARED);
190 * Calculate how many blocks we need for the new attribute,
194 struct xfs_inode *ip,
199 struct xfs_mount *mp = ip->i_mount;
204 * Determine space new attribute will use, and if it would be
205 * "local" or "remote" (note: local != inline).
207 size = xfs_attr_leaf_newentsize(namelen, valuelen,
208 mp->m_sb.sb_blocksize, local);
210 nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
212 if (size > (mp->m_sb.sb_blocksize >> 1)) {
213 /* Double split possible */
218 * Out of line attribute, cannot double split, but
219 * make room for the attribute value itself.
221 uint dblocks = XFS_B_TO_FSB(mp, valuelen);
223 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
231 struct xfs_inode *dp,
232 struct xfs_name *name,
233 unsigned char *value,
238 xfs_fsblock_t firstblock;
239 xfs_bmap_free_t flist;
240 int error, err2, committed;
241 xfs_mount_t *mp = dp->i_mount;
242 int rsvd = (flags & ATTR_ROOT) != 0;
246 * Attach the dquots to the inode.
248 error = xfs_qm_dqattach(dp, 0);
253 * If the inode doesn't have an attribute fork, add one.
254 * (inode must not be locked when we call this routine)
256 if (XFS_IFORK_Q(dp) == 0) {
257 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
258 XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen);
260 if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
265 * Fill in the arg structure for this request.
267 memset((char *)&args, 0, sizeof(args));
268 args.name = name->name;
269 args.namelen = name->len;
271 args.valuelen = valuelen;
273 args.hashval = xfs_da_hashname(args.name, args.namelen);
275 args.firstblock = &firstblock;
277 args.whichfork = XFS_ATTR_FORK;
278 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
280 /* Size is now blocks for attribute data */
281 args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
284 * Start our first transaction of the day.
286 * All future transactions during this code must be "chained" off
287 * this one via the trans_dup() call. All transactions will contain
288 * the inode, and the inode will always be marked with trans_ihold().
289 * Since the inode will be locked in all transactions, we must log
290 * the inode in every transaction to let it float upward through
293 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
296 * Root fork attributes can use reserved data blocks for this
297 * operation if necessary
301 args.trans->t_flags |= XFS_TRANS_RESERVE;
303 error = xfs_trans_reserve(args.trans, args.total,
304 XFS_ATTRSETM_LOG_RES(mp) +
305 XFS_ATTRSETRT_LOG_RES(mp) * args.total,
306 0, XFS_TRANS_PERM_LOG_RES,
307 XFS_ATTRSET_LOG_COUNT);
309 xfs_trans_cancel(args.trans, 0);
312 xfs_ilock(dp, XFS_ILOCK_EXCL);
314 error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
315 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
316 XFS_QMOPT_RES_REGBLKS);
318 xfs_iunlock(dp, XFS_ILOCK_EXCL);
319 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
323 xfs_trans_ijoin(args.trans, dp, 0);
326 * If the attribute list is non-existent or a shortform list,
327 * upgrade it to a single-leaf-block attribute list.
329 if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
330 ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
331 (dp->i_d.di_anextents == 0))) {
334 * Build initial attribute list (if required).
336 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
337 xfs_attr_shortform_create(&args);
340 * Try to add the attr to the attribute list in
343 error = xfs_attr_shortform_addname(&args);
344 if (error != ENOSPC) {
346 * Commit the shortform mods, and we're done.
347 * NOTE: this is also the error path (EEXIST, etc).
349 ASSERT(args.trans != NULL);
352 * If this is a synchronous mount, make sure that
353 * the transaction goes to disk before returning
356 if (mp->m_flags & XFS_MOUNT_WSYNC) {
357 xfs_trans_set_sync(args.trans);
360 if (!error && (flags & ATTR_KERNOTIME) == 0) {
361 xfs_trans_ichgtime(args.trans, dp,
364 err2 = xfs_trans_commit(args.trans,
365 XFS_TRANS_RELEASE_LOG_RES);
366 xfs_iunlock(dp, XFS_ILOCK_EXCL);
368 return(error == 0 ? err2 : error);
372 * It won't fit in the shortform, transform to a leaf block.
373 * GROT: another possible req'mt for a double-split btree op.
375 xfs_bmap_init(args.flist, args.firstblock);
376 error = xfs_attr_shortform_to_leaf(&args);
378 error = xfs_bmap_finish(&args.trans, args.flist,
384 xfs_bmap_cancel(&flist);
389 * bmap_finish() may have committed the last trans and started
390 * a new one. We need the inode to be in all transactions.
393 xfs_trans_ijoin(args.trans, dp, 0);
396 * Commit the leaf transformation. We'll need another (linked)
397 * transaction to add the new attribute to the leaf.
400 error = xfs_trans_roll(&args.trans, dp);
406 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
407 error = xfs_attr_leaf_addname(&args);
409 error = xfs_attr_node_addname(&args);
416 * If this is a synchronous mount, make sure that the
417 * transaction goes to disk before returning to the user.
419 if (mp->m_flags & XFS_MOUNT_WSYNC) {
420 xfs_trans_set_sync(args.trans);
423 if ((flags & ATTR_KERNOTIME) == 0)
424 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
427 * Commit the last in the sequence of transactions.
429 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
430 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
431 xfs_iunlock(dp, XFS_ILOCK_EXCL);
437 xfs_trans_cancel(args.trans,
438 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
439 xfs_iunlock(dp, XFS_ILOCK_EXCL);
446 const unsigned char *name,
447 unsigned char *value,
452 struct xfs_name xname;
454 XFS_STATS_INC(xs_attr_set);
456 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
459 error = xfs_attr_name_to_xname(&xname, name);
463 return xfs_attr_set_int(dp, &xname, value, valuelen, flags);
467 * Generic handler routine to remove a name from an attribute list.
468 * Transitions attribute list from Btree to shortform as necessary.
471 xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
474 xfs_fsblock_t firstblock;
475 xfs_bmap_free_t flist;
477 xfs_mount_t *mp = dp->i_mount;
480 * Fill in the arg structure for this request.
482 memset((char *)&args, 0, sizeof(args));
483 args.name = name->name;
484 args.namelen = name->len;
486 args.hashval = xfs_da_hashname(args.name, args.namelen);
488 args.firstblock = &firstblock;
491 args.whichfork = XFS_ATTR_FORK;
494 * we have no control over the attribute names that userspace passes us
495 * to remove, so we have to allow the name lookup prior to attribute
498 args.op_flags = XFS_DA_OP_OKNOENT;
501 * Attach the dquots to the inode.
503 error = xfs_qm_dqattach(dp, 0);
508 * Start our first transaction of the day.
510 * All future transactions during this code must be "chained" off
511 * this one via the trans_dup() call. All transactions will contain
512 * the inode, and the inode will always be marked with trans_ihold().
513 * Since the inode will be locked in all transactions, we must log
514 * the inode in every transaction to let it float upward through
517 args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
520 * Root fork attributes can use reserved data blocks for this
521 * operation if necessary
524 if (flags & ATTR_ROOT)
525 args.trans->t_flags |= XFS_TRANS_RESERVE;
527 if ((error = xfs_trans_reserve(args.trans,
528 XFS_ATTRRM_SPACE_RES(mp),
529 XFS_ATTRRM_LOG_RES(mp),
530 0, XFS_TRANS_PERM_LOG_RES,
531 XFS_ATTRRM_LOG_COUNT))) {
532 xfs_trans_cancel(args.trans, 0);
536 xfs_ilock(dp, XFS_ILOCK_EXCL);
538 * No need to make quota reservations here. We expect to release some
539 * blocks not allocate in the common case.
541 xfs_trans_ijoin(args.trans, dp, 0);
544 * Decide on what work routines to call based on the inode size.
546 if (!xfs_inode_hasattr(dp)) {
547 error = XFS_ERROR(ENOATTR);
550 if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
551 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
552 error = xfs_attr_shortform_remove(&args);
556 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
557 error = xfs_attr_leaf_removename(&args);
559 error = xfs_attr_node_removename(&args);
566 * If this is a synchronous mount, make sure that the
567 * transaction goes to disk before returning to the user.
569 if (mp->m_flags & XFS_MOUNT_WSYNC) {
570 xfs_trans_set_sync(args.trans);
573 if ((flags & ATTR_KERNOTIME) == 0)
574 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
577 * Commit the last in the sequence of transactions.
579 xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
580 error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
581 xfs_iunlock(dp, XFS_ILOCK_EXCL);
587 xfs_trans_cancel(args.trans,
588 XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
589 xfs_iunlock(dp, XFS_ILOCK_EXCL);
596 const unsigned char *name,
600 struct xfs_name xname;
602 XFS_STATS_INC(xs_attr_remove);
604 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
607 error = xfs_attr_name_to_xname(&xname, name);
611 xfs_ilock(dp, XFS_ILOCK_SHARED);
612 if (!xfs_inode_hasattr(dp)) {
613 xfs_iunlock(dp, XFS_ILOCK_SHARED);
614 return XFS_ERROR(ENOATTR);
616 xfs_iunlock(dp, XFS_ILOCK_SHARED);
618 return xfs_attr_remove_int(dp, &xname, flags);
622 xfs_attr_list_int(xfs_attr_list_context_t *context)
625 xfs_inode_t *dp = context->dp;
627 XFS_STATS_INC(xs_attr_list);
629 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
632 xfs_ilock(dp, XFS_ILOCK_SHARED);
635 * Decide on what work routines to call based on the inode size.
637 if (!xfs_inode_hasattr(dp)) {
639 } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
640 error = xfs_attr_shortform_list(context);
641 } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
642 error = xfs_attr_leaf_list(context);
644 error = xfs_attr_node_list(context);
647 xfs_iunlock(dp, XFS_ILOCK_SHARED);
652 #define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
653 (((struct attrlist_ent *) 0)->a_name - (char *) 0)
654 #define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
655 ((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
656 & ~(sizeof(u_int32_t)-1))
659 * Format an attribute and copy it out to the user's buffer.
660 * Take care to check values and protect against them changing later,
661 * we may be reading them directly out of a user buffer.
665 xfs_attr_put_listent(
666 xfs_attr_list_context_t *context,
671 unsigned char *value)
673 struct attrlist *alist = (struct attrlist *)context->alist;
677 ASSERT(!(context->flags & ATTR_KERNOVAL));
678 ASSERT(context->count >= 0);
679 ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
680 ASSERT(context->firstu >= sizeof(*alist));
681 ASSERT(context->firstu <= context->bufsize);
684 * Only list entries in the right namespace.
686 if (((context->flags & ATTR_SECURE) == 0) !=
687 ((flags & XFS_ATTR_SECURE) == 0))
689 if (((context->flags & ATTR_ROOT) == 0) !=
690 ((flags & XFS_ATTR_ROOT) == 0))
693 arraytop = sizeof(*alist) +
694 context->count * sizeof(alist->al_offset[0]);
695 context->firstu -= ATTR_ENTSIZE(namelen);
696 if (context->firstu < arraytop) {
697 trace_xfs_attr_list_full(context);
699 context->seen_enough = 1;
703 aep = (attrlist_ent_t *)&context->alist[context->firstu];
704 aep->a_valuelen = valuelen;
705 memcpy(aep->a_name, name, namelen);
706 aep->a_name[namelen] = 0;
707 alist->al_offset[context->count++] = context->firstu;
708 alist->al_count = context->count;
709 trace_xfs_attr_list_add(context);
714 * Generate a list of extended attribute names and optionally
715 * also value lengths. Positive return value follows the XFS
716 * convention of being an error, zero or negative return code
717 * is the length of the buffer returned (negated), indicating
726 attrlist_cursor_kern_t *cursor)
728 xfs_attr_list_context_t context;
729 struct attrlist *alist;
733 * Validate the cursor.
735 if (cursor->pad1 || cursor->pad2)
736 return(XFS_ERROR(EINVAL));
737 if ((cursor->initted == 0) &&
738 (cursor->hashval || cursor->blkno || cursor->offset))
739 return XFS_ERROR(EINVAL);
742 * Check for a properly aligned buffer.
744 if (((long)buffer) & (sizeof(int)-1))
745 return XFS_ERROR(EFAULT);
746 if (flags & ATTR_KERNOVAL)
750 * Initialize the output buffer.
752 memset(&context, 0, sizeof(context));
754 context.cursor = cursor;
756 context.flags = flags;
757 context.alist = buffer;
758 context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
759 context.firstu = context.bufsize;
760 context.put_listent = xfs_attr_put_listent;
762 alist = (struct attrlist *)context.alist;
765 alist->al_offset[0] = context.bufsize;
767 error = xfs_attr_list_int(&context);
773 xfs_attr_inactive(xfs_inode_t *dp)
780 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
782 xfs_ilock(dp, XFS_ILOCK_SHARED);
783 if (!xfs_inode_hasattr(dp) ||
784 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
785 xfs_iunlock(dp, XFS_ILOCK_SHARED);
788 xfs_iunlock(dp, XFS_ILOCK_SHARED);
791 * Start our first transaction of the day.
793 * All future transactions during this code must be "chained" off
794 * this one via the trans_dup() call. All transactions will contain
795 * the inode, and the inode will always be marked with trans_ihold().
796 * Since the inode will be locked in all transactions, we must log
797 * the inode in every transaction to let it float upward through
800 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
801 if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
802 XFS_TRANS_PERM_LOG_RES,
803 XFS_ATTRINVAL_LOG_COUNT))) {
804 xfs_trans_cancel(trans, 0);
807 xfs_ilock(dp, XFS_ILOCK_EXCL);
810 * No need to make quota reservations here. We expect to release some
811 * blocks, not allocate, in the common case.
813 xfs_trans_ijoin(trans, dp, 0);
816 * Decide on what work routines to call based on the inode size.
818 if (!xfs_inode_hasattr(dp) ||
819 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
823 error = xfs_attr_root_inactive(&trans, dp);
827 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
831 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
832 xfs_iunlock(dp, XFS_ILOCK_EXCL);
837 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
838 xfs_iunlock(dp, XFS_ILOCK_EXCL);
844 /*========================================================================
845 * External routines when attribute list is inside the inode
846 *========================================================================*/
849 * Add a name to the shortform attribute list structure
850 * This is the external routine.
853 xfs_attr_shortform_addname(xfs_da_args_t *args)
855 int newsize, forkoff, retval;
857 trace_xfs_attr_sf_addname(args);
859 retval = xfs_attr_shortform_lookup(args);
860 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
862 } else if (retval == EEXIST) {
863 if (args->flags & ATTR_CREATE)
865 retval = xfs_attr_shortform_remove(args);
869 if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
870 args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
871 return(XFS_ERROR(ENOSPC));
873 newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
874 newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
876 forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
878 return(XFS_ERROR(ENOSPC));
880 xfs_attr_shortform_add(args, forkoff);
885 /*========================================================================
886 * External routines when attribute list is one block
887 *========================================================================*/
890 * Add a name to the leaf attribute list structure
892 * This leaf block cannot have a "remote" value, we only call this routine
893 * if bmap_one_block() says there is only one block (ie: no remote blks).
896 xfs_attr_leaf_addname(xfs_da_args_t *args)
900 int retval, error, committed, forkoff;
902 trace_xfs_attr_leaf_addname(args);
905 * Read the (only) block in the attribute list in.
909 error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
914 * Look up the given attribute in the leaf block. Figure out if
915 * the given flags produce an error or call for an atomic rename.
917 retval = xfs_attr_leaf_lookup_int(bp, args);
918 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
919 xfs_trans_brelse(args->trans, bp);
921 } else if (retval == EEXIST) {
922 if (args->flags & ATTR_CREATE) { /* pure create op */
923 xfs_trans_brelse(args->trans, bp);
927 trace_xfs_attr_leaf_replace(args);
929 args->op_flags |= XFS_DA_OP_RENAME; /* an atomic rename */
930 args->blkno2 = args->blkno; /* set 2nd entry info*/
931 args->index2 = args->index;
932 args->rmtblkno2 = args->rmtblkno;
933 args->rmtblkcnt2 = args->rmtblkcnt;
937 * Add the attribute to the leaf block, transitioning to a Btree
940 retval = xfs_attr_leaf_add(bp, args);
941 if (retval == ENOSPC) {
943 * Promote the attribute list to the Btree format, then
944 * Commit that transaction so that the node_addname() call
945 * can manage its own transactions.
947 xfs_bmap_init(args->flist, args->firstblock);
948 error = xfs_attr_leaf_to_node(args);
950 error = xfs_bmap_finish(&args->trans, args->flist,
956 xfs_bmap_cancel(args->flist);
961 * bmap_finish() may have committed the last trans and started
962 * a new one. We need the inode to be in all transactions.
965 xfs_trans_ijoin(args->trans, dp, 0);
968 * Commit the current trans (including the inode) and start
971 error = xfs_trans_roll(&args->trans, dp);
976 * Fob the whole rest of the problem off on the Btree code.
978 error = xfs_attr_node_addname(args);
983 * Commit the transaction that added the attr name so that
984 * later routines can manage their own transactions.
986 error = xfs_trans_roll(&args->trans, dp);
991 * If there was an out-of-line value, allocate the blocks we
992 * identified for its storage and copy the value. This is done
993 * after we create the attribute so that we don't overflow the
994 * maximum size of a transaction and/or hit a deadlock.
996 if (args->rmtblkno > 0) {
997 error = xfs_attr_rmtval_set(args);
1003 * If this is an atomic rename operation, we must "flip" the
1004 * incomplete flags on the "new" and "old" attribute/value pairs
1005 * so that one disappears and one appears atomically. Then we
1006 * must remove the "old" attribute/value pair.
1008 if (args->op_flags & XFS_DA_OP_RENAME) {
1010 * In a separate transaction, set the incomplete flag on the
1011 * "old" attr and clear the incomplete flag on the "new" attr.
1013 error = xfs_attr_leaf_flipflags(args);
1018 * Dismantle the "old" attribute/value pair by removing
1019 * a "remote" value (if it exists).
1021 args->index = args->index2;
1022 args->blkno = args->blkno2;
1023 args->rmtblkno = args->rmtblkno2;
1024 args->rmtblkcnt = args->rmtblkcnt2;
1025 if (args->rmtblkno) {
1026 error = xfs_attr_rmtval_remove(args);
1032 * Read in the block containing the "old" attr, then
1033 * remove the "old" attr from that block (neat, huh!)
1035 error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno,
1040 xfs_attr_leaf_remove(bp, args);
1043 * If the result is small enough, shrink it all into the inode.
1045 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1046 xfs_bmap_init(args->flist, args->firstblock);
1047 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1048 /* bp is gone due to xfs_da_shrink_inode */
1050 error = xfs_bmap_finish(&args->trans,
1057 xfs_bmap_cancel(args->flist);
1062 * bmap_finish() may have committed the last trans
1063 * and started a new one. We need the inode to be
1064 * in all transactions.
1067 xfs_trans_ijoin(args->trans, dp, 0);
1071 * Commit the remove and start the next trans in series.
1073 error = xfs_trans_roll(&args->trans, dp);
1075 } else if (args->rmtblkno > 0) {
1077 * Added a "remote" value, just clear the incomplete flag.
1079 error = xfs_attr_leaf_clearflag(args);
1085 * Remove a name from the leaf attribute list structure
1087 * This leaf block cannot have a "remote" value, we only call this routine
1088 * if bmap_one_block() says there is only one block (ie: no remote blks).
1091 xfs_attr_leaf_removename(xfs_da_args_t *args)
1095 int error, committed, forkoff;
1097 trace_xfs_attr_leaf_removename(args);
1100 * Remove the attribute.
1104 error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
1108 error = xfs_attr_leaf_lookup_int(bp, args);
1109 if (error == ENOATTR) {
1110 xfs_trans_brelse(args->trans, bp);
1114 xfs_attr_leaf_remove(bp, args);
1117 * If the result is small enough, shrink it all into the inode.
1119 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1120 xfs_bmap_init(args->flist, args->firstblock);
1121 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1122 /* bp is gone due to xfs_da_shrink_inode */
1124 error = xfs_bmap_finish(&args->trans, args->flist,
1130 xfs_bmap_cancel(args->flist);
1135 * bmap_finish() may have committed the last trans and started
1136 * a new one. We need the inode to be in all transactions.
1139 xfs_trans_ijoin(args->trans, dp, 0);
1145 * Look up a name in a leaf attribute list structure.
1147 * This leaf block cannot have a "remote" value, we only call this routine
1148 * if bmap_one_block() says there is only one block (ie: no remote blks).
1151 xfs_attr_leaf_get(xfs_da_args_t *args)
1156 trace_xfs_attr_leaf_get(args);
1159 error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
1163 error = xfs_attr_leaf_lookup_int(bp, args);
1164 if (error != EEXIST) {
1165 xfs_trans_brelse(args->trans, bp);
1168 error = xfs_attr_leaf_getvalue(bp, args);
1169 xfs_trans_brelse(args->trans, bp);
1170 if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1171 error = xfs_attr_rmtval_get(args);
1177 * Copy out attribute entries for attr_list(), for leaf attribute lists.
1180 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1185 trace_xfs_attr_leaf_list(context);
1187 context->cursor->blkno = 0;
1188 error = xfs_attr_leaf_read(NULL, context->dp, 0, -1, &bp);
1190 return XFS_ERROR(error);
1192 error = xfs_attr_leaf_list_int(bp, context);
1193 xfs_trans_brelse(NULL, bp);
1194 return XFS_ERROR(error);
1198 /*========================================================================
1199 * External routines when attribute list size > XFS_LBSIZE(mp).
1200 *========================================================================*/
1203 * Add a name to a Btree-format attribute list.
1205 * This will involve walking down the Btree, and may involve splitting
1206 * leaf nodes and even splitting intermediate nodes up to and including
1207 * the root node (a special case of an intermediate node).
1209 * "Remote" attribute values confuse the issue and atomic rename operations
1210 * add a whole extra layer of confusion on top of that.
1213 xfs_attr_node_addname(xfs_da_args_t *args)
1215 xfs_da_state_t *state;
1216 xfs_da_state_blk_t *blk;
1219 int committed, retval, error;
1221 trace_xfs_attr_node_addname(args);
1224 * Fill in bucket of arguments/results/context to carry around.
1229 state = xfs_da_state_alloc();
1232 state->blocksize = state->mp->m_sb.sb_blocksize;
1233 state->node_ents = state->mp->m_attr_node_ents;
1236 * Search to see if name already exists, and get back a pointer
1237 * to where it should go.
1239 error = xfs_da_node_lookup_int(state, &retval);
1242 blk = &state->path.blk[ state->path.active-1 ];
1243 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1244 if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1246 } else if (retval == EEXIST) {
1247 if (args->flags & ATTR_CREATE)
1250 trace_xfs_attr_node_replace(args);
1252 args->op_flags |= XFS_DA_OP_RENAME; /* atomic rename op */
1253 args->blkno2 = args->blkno; /* set 2nd entry info*/
1254 args->index2 = args->index;
1255 args->rmtblkno2 = args->rmtblkno;
1256 args->rmtblkcnt2 = args->rmtblkcnt;
1258 args->rmtblkcnt = 0;
1261 retval = xfs_attr_leaf_add(blk->bp, state->args);
1262 if (retval == ENOSPC) {
1263 if (state->path.active == 1) {
1265 * Its really a single leaf node, but it had
1266 * out-of-line values so it looked like it *might*
1267 * have been a b-tree.
1269 xfs_da_state_free(state);
1270 xfs_bmap_init(args->flist, args->firstblock);
1271 error = xfs_attr_leaf_to_node(args);
1273 error = xfs_bmap_finish(&args->trans,
1280 xfs_bmap_cancel(args->flist);
1285 * bmap_finish() may have committed the last trans
1286 * and started a new one. We need the inode to be
1287 * in all transactions.
1290 xfs_trans_ijoin(args->trans, dp, 0);
1293 * Commit the node conversion and start the next
1294 * trans in the chain.
1296 error = xfs_trans_roll(&args->trans, dp);
1304 * Split as many Btree elements as required.
1305 * This code tracks the new and old attr's location
1306 * in the index/blkno/rmtblkno/rmtblkcnt fields and
1307 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1309 xfs_bmap_init(args->flist, args->firstblock);
1310 error = xfs_da_split(state);
1312 error = xfs_bmap_finish(&args->trans, args->flist,
1318 xfs_bmap_cancel(args->flist);
1323 * bmap_finish() may have committed the last trans and started
1324 * a new one. We need the inode to be in all transactions.
1327 xfs_trans_ijoin(args->trans, dp, 0);
1330 * Addition succeeded, update Btree hashvals.
1332 xfs_da_fixhashpath(state, &state->path);
1336 * Kill the state structure, we're done with it and need to
1337 * allow the buffers to come back later.
1339 xfs_da_state_free(state);
1343 * Commit the leaf addition or btree split and start the next
1344 * trans in the chain.
1346 error = xfs_trans_roll(&args->trans, dp);
1351 * If there was an out-of-line value, allocate the blocks we
1352 * identified for its storage and copy the value. This is done
1353 * after we create the attribute so that we don't overflow the
1354 * maximum size of a transaction and/or hit a deadlock.
1356 if (args->rmtblkno > 0) {
1357 error = xfs_attr_rmtval_set(args);
1363 * If this is an atomic rename operation, we must "flip" the
1364 * incomplete flags on the "new" and "old" attribute/value pairs
1365 * so that one disappears and one appears atomically. Then we
1366 * must remove the "old" attribute/value pair.
1368 if (args->op_flags & XFS_DA_OP_RENAME) {
1370 * In a separate transaction, set the incomplete flag on the
1371 * "old" attr and clear the incomplete flag on the "new" attr.
1373 error = xfs_attr_leaf_flipflags(args);
1378 * Dismantle the "old" attribute/value pair by removing
1379 * a "remote" value (if it exists).
1381 args->index = args->index2;
1382 args->blkno = args->blkno2;
1383 args->rmtblkno = args->rmtblkno2;
1384 args->rmtblkcnt = args->rmtblkcnt2;
1385 if (args->rmtblkno) {
1386 error = xfs_attr_rmtval_remove(args);
1392 * Re-find the "old" attribute entry after any split ops.
1393 * The INCOMPLETE flag means that we will find the "old"
1394 * attr, not the "new" one.
1396 args->flags |= XFS_ATTR_INCOMPLETE;
1397 state = xfs_da_state_alloc();
1400 state->blocksize = state->mp->m_sb.sb_blocksize;
1401 state->node_ents = state->mp->m_attr_node_ents;
1403 error = xfs_da_node_lookup_int(state, &retval);
1408 * Remove the name and update the hashvals in the tree.
1410 blk = &state->path.blk[ state->path.active-1 ];
1411 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1412 error = xfs_attr_leaf_remove(blk->bp, args);
1413 xfs_da_fixhashpath(state, &state->path);
1416 * Check to see if the tree needs to be collapsed.
1418 if (retval && (state->path.active > 1)) {
1419 xfs_bmap_init(args->flist, args->firstblock);
1420 error = xfs_da_join(state);
1422 error = xfs_bmap_finish(&args->trans,
1429 xfs_bmap_cancel(args->flist);
1434 * bmap_finish() may have committed the last trans
1435 * and started a new one. We need the inode to be
1436 * in all transactions.
1439 xfs_trans_ijoin(args->trans, dp, 0);
1443 * Commit and start the next trans in the chain.
1445 error = xfs_trans_roll(&args->trans, dp);
1449 } else if (args->rmtblkno > 0) {
1451 * Added a "remote" value, just clear the incomplete flag.
1453 error = xfs_attr_leaf_clearflag(args);
1461 xfs_da_state_free(state);
1468 * Remove a name from a B-tree attribute list.
1470 * This will involve walking down the Btree, and may involve joining
1471 * leaf nodes and even joining intermediate nodes up to and including
1472 * the root node (a special case of an intermediate node).
1475 xfs_attr_node_removename(xfs_da_args_t *args)
1477 xfs_da_state_t *state;
1478 xfs_da_state_blk_t *blk;
1481 int retval, error, committed, forkoff;
1483 trace_xfs_attr_node_removename(args);
1486 * Tie a string around our finger to remind us where we are.
1489 state = xfs_da_state_alloc();
1491 state->mp = dp->i_mount;
1492 state->blocksize = state->mp->m_sb.sb_blocksize;
1493 state->node_ents = state->mp->m_attr_node_ents;
1496 * Search to see if name exists, and get back a pointer to it.
1498 error = xfs_da_node_lookup_int(state, &retval);
1499 if (error || (retval != EEXIST)) {
1506 * If there is an out-of-line value, de-allocate the blocks.
1507 * This is done before we remove the attribute so that we don't
1508 * overflow the maximum size of a transaction and/or hit a deadlock.
1510 blk = &state->path.blk[ state->path.active-1 ];
1511 ASSERT(blk->bp != NULL);
1512 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1513 if (args->rmtblkno > 0) {
1515 * Fill in disk block numbers in the state structure
1516 * so that we can get the buffers back after we commit
1517 * several transactions in the following calls.
1519 error = xfs_attr_fillstate(state);
1524 * Mark the attribute as INCOMPLETE, then bunmapi() the
1527 error = xfs_attr_leaf_setflag(args);
1530 error = xfs_attr_rmtval_remove(args);
1535 * Refill the state structure with buffers, the prior calls
1536 * released our buffers.
1538 error = xfs_attr_refillstate(state);
1544 * Remove the name and update the hashvals in the tree.
1546 blk = &state->path.blk[ state->path.active-1 ];
1547 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1548 retval = xfs_attr_leaf_remove(blk->bp, args);
1549 xfs_da_fixhashpath(state, &state->path);
1552 * Check to see if the tree needs to be collapsed.
1554 if (retval && (state->path.active > 1)) {
1555 xfs_bmap_init(args->flist, args->firstblock);
1556 error = xfs_da_join(state);
1558 error = xfs_bmap_finish(&args->trans, args->flist,
1564 xfs_bmap_cancel(args->flist);
1569 * bmap_finish() may have committed the last trans and started
1570 * a new one. We need the inode to be in all transactions.
1573 xfs_trans_ijoin(args->trans, dp, 0);
1576 * Commit the Btree join operation and start a new trans.
1578 error = xfs_trans_roll(&args->trans, dp);
1584 * If the result is small enough, push it all into the inode.
1586 if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1588 * Have to get rid of the copy of this dabuf in the state.
1590 ASSERT(state->path.active == 1);
1591 ASSERT(state->path.blk[0].bp);
1592 state->path.blk[0].bp = NULL;
1594 error = xfs_attr_leaf_read(args->trans, args->dp, 0, -1, &bp);
1598 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1599 xfs_bmap_init(args->flist, args->firstblock);
1600 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1601 /* bp is gone due to xfs_da_shrink_inode */
1603 error = xfs_bmap_finish(&args->trans,
1610 xfs_bmap_cancel(args->flist);
1615 * bmap_finish() may have committed the last trans
1616 * and started a new one. We need the inode to be
1617 * in all transactions.
1620 xfs_trans_ijoin(args->trans, dp, 0);
1622 xfs_trans_brelse(args->trans, bp);
1627 xfs_da_state_free(state);
1632 * Fill in the disk block numbers in the state structure for the buffers
1633 * that are attached to the state structure.
1634 * This is done so that we can quickly reattach ourselves to those buffers
1635 * after some set of transaction commits have released these buffers.
1638 xfs_attr_fillstate(xfs_da_state_t *state)
1640 xfs_da_state_path_t *path;
1641 xfs_da_state_blk_t *blk;
1644 trace_xfs_attr_fillstate(state->args);
1647 * Roll down the "path" in the state structure, storing the on-disk
1648 * block number for those buffers in the "path".
1650 path = &state->path;
1651 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1652 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1654 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1657 blk->disk_blkno = 0;
1662 * Roll down the "altpath" in the state structure, storing the on-disk
1663 * block number for those buffers in the "altpath".
1665 path = &state->altpath;
1666 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1667 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1669 blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1672 blk->disk_blkno = 0;
1680 * Reattach the buffers to the state structure based on the disk block
1681 * numbers stored in the state structure.
1682 * This is done after some set of transaction commits have released those
1683 * buffers from our grip.
1686 xfs_attr_refillstate(xfs_da_state_t *state)
1688 xfs_da_state_path_t *path;
1689 xfs_da_state_blk_t *blk;
1692 trace_xfs_attr_refillstate(state->args);
1695 * Roll down the "path" in the state structure, storing the on-disk
1696 * block number for those buffers in the "path".
1698 path = &state->path;
1699 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1700 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1701 if (blk->disk_blkno) {
1702 error = xfs_da_node_read(state->args->trans,
1704 blk->blkno, blk->disk_blkno,
1705 &blk->bp, XFS_ATTR_FORK);
1714 * Roll down the "altpath" in the state structure, storing the on-disk
1715 * block number for those buffers in the "altpath".
1717 path = &state->altpath;
1718 ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1719 for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1720 if (blk->disk_blkno) {
1721 error = xfs_da_node_read(state->args->trans,
1723 blk->blkno, blk->disk_blkno,
1724 &blk->bp, XFS_ATTR_FORK);
1736 * Look up a filename in a node attribute list.
1738 * This routine gets called for any attribute fork that has more than one
1739 * block, ie: both true Btree attr lists and for single-leaf-blocks with
1740 * "remote" values taking up more blocks.
1743 xfs_attr_node_get(xfs_da_args_t *args)
1745 xfs_da_state_t *state;
1746 xfs_da_state_blk_t *blk;
1750 trace_xfs_attr_node_get(args);
1752 state = xfs_da_state_alloc();
1754 state->mp = args->dp->i_mount;
1755 state->blocksize = state->mp->m_sb.sb_blocksize;
1756 state->node_ents = state->mp->m_attr_node_ents;
1759 * Search to see if name exists, and get back a pointer to it.
1761 error = xfs_da_node_lookup_int(state, &retval);
1764 } else if (retval == EEXIST) {
1765 blk = &state->path.blk[ state->path.active-1 ];
1766 ASSERT(blk->bp != NULL);
1767 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1770 * Get the value, local or "remote"
1772 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1773 if (!retval && (args->rmtblkno > 0)
1774 && !(args->flags & ATTR_KERNOVAL)) {
1775 retval = xfs_attr_rmtval_get(args);
1780 * If not in a transaction, we have to release all the buffers.
1782 for (i = 0; i < state->path.active; i++) {
1783 xfs_trans_brelse(args->trans, state->path.blk[i].bp);
1784 state->path.blk[i].bp = NULL;
1787 xfs_da_state_free(state);
1791 STATIC int /* error */
1792 xfs_attr_node_list(xfs_attr_list_context_t *context)
1794 attrlist_cursor_kern_t *cursor;
1795 xfs_attr_leafblock_t *leaf;
1796 xfs_da_intnode_t *node;
1797 xfs_da_node_entry_t *btree;
1801 trace_xfs_attr_node_list(context);
1803 cursor = context->cursor;
1804 cursor->initted = 1;
1807 * Do all sorts of validation on the passed-in cursor structure.
1808 * If anything is amiss, ignore the cursor and look up the hashval
1809 * starting from the btree root.
1812 if (cursor->blkno > 0) {
1813 error = xfs_da_node_read(NULL, context->dp, cursor->blkno, -1,
1814 &bp, XFS_ATTR_FORK);
1815 if ((error != 0) && (error != EFSCORRUPTED))
1819 switch (be16_to_cpu(node->hdr.info.magic)) {
1820 case XFS_DA_NODE_MAGIC:
1821 trace_xfs_attr_list_wrong_blk(context);
1822 xfs_trans_brelse(NULL, bp);
1825 case XFS_ATTR_LEAF_MAGIC:
1827 if (cursor->hashval > be32_to_cpu(leaf->entries[
1828 be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1829 trace_xfs_attr_list_wrong_blk(context);
1830 xfs_trans_brelse(NULL, bp);
1832 } else if (cursor->hashval <=
1833 be32_to_cpu(leaf->entries[0].hashval)) {
1834 trace_xfs_attr_list_wrong_blk(context);
1835 xfs_trans_brelse(NULL, bp);
1840 trace_xfs_attr_list_wrong_blk(context);
1841 xfs_trans_brelse(NULL, bp);
1848 * We did not find what we expected given the cursor's contents,
1849 * so we start from the top and work down based on the hash value.
1850 * Note that start of node block is same as start of leaf block.
1855 error = xfs_da_node_read(NULL, context->dp,
1856 cursor->blkno, -1, &bp,
1861 if (node->hdr.info.magic ==
1862 cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
1864 if (unlikely(node->hdr.info.magic !=
1865 cpu_to_be16(XFS_DA_NODE_MAGIC))) {
1866 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1868 context->dp->i_mount,
1870 xfs_trans_brelse(NULL, bp);
1871 return(XFS_ERROR(EFSCORRUPTED));
1873 btree = node->btree;
1874 for (i = 0; i < be16_to_cpu(node->hdr.count);
1877 <= be32_to_cpu(btree->hashval)) {
1878 cursor->blkno = be32_to_cpu(btree->before);
1879 trace_xfs_attr_list_node_descend(context,
1884 if (i == be16_to_cpu(node->hdr.count)) {
1885 xfs_trans_brelse(NULL, bp);
1888 xfs_trans_brelse(NULL, bp);
1894 * Roll upward through the blocks, processing each leaf block in
1895 * order. As long as there is space in the result buffer, keep
1896 * adding the information.
1900 error = xfs_attr_leaf_list_int(bp, context);
1902 xfs_trans_brelse(NULL, bp);
1905 if (context->seen_enough || leaf->hdr.info.forw == 0)
1907 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1908 xfs_trans_brelse(NULL, bp);
1909 error = xfs_attr_leaf_read(NULL, context->dp, cursor->blkno, -1,
1914 xfs_trans_brelse(NULL, bp);
1919 /*========================================================================
1920 * External routines for manipulating out-of-line attribute values.
1921 *========================================================================*/
1924 * Read the value associated with an attribute from the out-of-line buffer
1925 * that we stored it in.
1928 xfs_attr_rmtval_get(xfs_da_args_t *args)
1930 xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1935 int nmap, error, tmp, valuelen, blkcnt, i;
1938 trace_xfs_attr_rmtval_get(args);
1940 ASSERT(!(args->flags & ATTR_KERNOVAL));
1942 mp = args->dp->i_mount;
1944 valuelen = args->valuelen;
1945 lblkno = args->rmtblkno;
1946 while (valuelen > 0) {
1947 nmap = ATTR_RMTVALUE_MAPSIZE;
1948 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
1949 args->rmtblkcnt, map, &nmap,
1950 XFS_BMAPI_ATTRFORK);
1955 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1956 ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1957 (map[i].br_startblock != HOLESTARTBLOCK));
1958 dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1959 blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1960 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
1961 dblkno, blkcnt, 0, &bp, NULL);
1965 tmp = min_t(int, valuelen, BBTOB(bp->b_length));
1966 xfs_buf_iomove(bp, 0, tmp, dst, XBRW_READ);
1971 lblkno += map[i].br_blockcount;
1974 ASSERT(valuelen == 0);
1979 * Write the value associated with an attribute into the out-of-line buffer
1980 * that we have defined for it.
1983 xfs_attr_rmtval_set(xfs_da_args_t *args)
1986 xfs_fileoff_t lfileoff;
1988 xfs_bmbt_irec_t map;
1993 int blkcnt, valuelen, nmap, error, tmp, committed;
1995 trace_xfs_attr_rmtval_set(args);
2002 * Find a "hole" in the attribute address space large enough for
2003 * us to drop the new attribute's value into.
2005 blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
2007 error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
2012 args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
2013 args->rmtblkcnt = blkcnt;
2016 * Roll through the "value", allocating blocks on disk as required.
2018 while (blkcnt > 0) {
2020 * Allocate a single extent, up to the size of the value.
2022 xfs_bmap_init(args->flist, args->firstblock);
2024 error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
2026 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2027 args->firstblock, args->total, &map, &nmap,
2030 error = xfs_bmap_finish(&args->trans, args->flist,
2036 xfs_bmap_cancel(args->flist);
2041 * bmap_finish() may have committed the last trans and started
2042 * a new one. We need the inode to be in all transactions.
2045 xfs_trans_ijoin(args->trans, dp, 0);
2048 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2049 (map.br_startblock != HOLESTARTBLOCK));
2050 lblkno += map.br_blockcount;
2051 blkcnt -= map.br_blockcount;
2054 * Start the next trans in the chain.
2056 error = xfs_trans_roll(&args->trans, dp);
2062 * Roll through the "value", copying the attribute value to the
2063 * already-allocated blocks. Blocks are written synchronously
2064 * so that we can know they are all on disk before we turn off
2065 * the INCOMPLETE flag.
2067 lblkno = args->rmtblkno;
2068 valuelen = args->valuelen;
2069 while (valuelen > 0) {
2073 * Try to remember where we decided to put the value.
2075 xfs_bmap_init(args->flist, args->firstblock);
2077 error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
2078 args->rmtblkcnt, &map, &nmap,
2079 XFS_BMAPI_ATTRFORK);
2083 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2084 (map.br_startblock != HOLESTARTBLOCK));
2086 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2087 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2089 bp = xfs_buf_get(mp->m_ddev_targp, dblkno, blkcnt, 0);
2093 buflen = BBTOB(bp->b_length);
2094 tmp = min_t(int, valuelen, buflen);
2095 xfs_buf_iomove(bp, 0, tmp, src, XBRW_WRITE);
2097 xfs_buf_zero(bp, tmp, buflen - tmp);
2099 error = xfs_bwrite(bp); /* GROT: NOTE: synchronous write */
2106 lblkno += map.br_blockcount;
2108 ASSERT(valuelen == 0);
2113 * Remove the value associated with an attribute by deleting the
2114 * out-of-line buffer that it is stored on.
2117 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2120 xfs_bmbt_irec_t map;
2124 int valuelen, blkcnt, nmap, error, done, committed;
2126 trace_xfs_attr_rmtval_remove(args);
2128 mp = args->dp->i_mount;
2131 * Roll through the "value", invalidating the attribute value's
2134 lblkno = args->rmtblkno;
2135 valuelen = args->rmtblkcnt;
2136 while (valuelen > 0) {
2138 * Try to remember where we decided to put the value.
2141 error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
2142 args->rmtblkcnt, &map, &nmap,
2143 XFS_BMAPI_ATTRFORK);
2147 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2148 (map.br_startblock != HOLESTARTBLOCK));
2150 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2151 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2154 * If the "remote" value is in the cache, remove it.
2156 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt, XBF_TRYLOCK);
2163 valuelen -= map.br_blockcount;
2165 lblkno += map.br_blockcount;
2169 * Keep de-allocating extents until the remote-value region is gone.
2171 lblkno = args->rmtblkno;
2172 blkcnt = args->rmtblkcnt;
2175 xfs_bmap_init(args->flist, args->firstblock);
2176 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2177 XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2178 1, args->firstblock, args->flist,
2181 error = xfs_bmap_finish(&args->trans, args->flist,
2187 xfs_bmap_cancel(args->flist);
2192 * bmap_finish() may have committed the last trans and started
2193 * a new one. We need the inode to be in all transactions.
2196 xfs_trans_ijoin(args->trans, args->dp, 0);
2199 * Close out trans and start the next one in the chain.
2201 error = xfs_trans_roll(&args->trans, args->dp);