xref: /openbmc/linux/fs/xfs/xfs_attr_list.c (revision dc6a81c3) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4  * Copyright (c) 2013 Red Hat, Inc.
5  * All Rights Reserved.
6  */
7 #include "xfs.h"
8 #include "xfs_fs.h"
9 #include "xfs_shared.h"
10 #include "xfs_format.h"
11 #include "xfs_log_format.h"
12 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_da_format.h"
15 #include "xfs_inode.h"
16 #include "xfs_trans.h"
17 #include "xfs_bmap.h"
18 #include "xfs_attr.h"
19 #include "xfs_attr_sf.h"
20 #include "xfs_attr_leaf.h"
21 #include "xfs_error.h"
22 #include "xfs_trace.h"
23 #include "xfs_dir2.h"
24 
25 STATIC int
26 xfs_attr_shortform_compare(const void *a, const void *b)
27 {
28 	xfs_attr_sf_sort_t *sa, *sb;
29 
30 	sa = (xfs_attr_sf_sort_t *)a;
31 	sb = (xfs_attr_sf_sort_t *)b;
32 	if (sa->hash < sb->hash) {
33 		return -1;
34 	} else if (sa->hash > sb->hash) {
35 		return 1;
36 	} else {
37 		return sa->entno - sb->entno;
38 	}
39 }
40 
41 #define XFS_ISRESET_CURSOR(cursor) \
42 	(!((cursor)->initted) && !((cursor)->hashval) && \
43 	 !((cursor)->blkno) && !((cursor)->offset))
44 /*
45  * Copy out entries of shortform attribute lists for attr_list().
46  * Shortform attribute lists are not stored in hashval sorted order.
47  * If the output buffer is not large enough to hold them all, then we
48  * we have to calculate each entries' hashvalue and sort them before
49  * we can begin returning them to the user.
50  */
51 static int
52 xfs_attr_shortform_list(
53 	struct xfs_attr_list_context	*context)
54 {
55 	struct attrlist_cursor_kern	*cursor;
56 	struct xfs_attr_sf_sort		*sbuf, *sbp;
57 	struct xfs_attr_shortform	*sf;
58 	struct xfs_attr_sf_entry	*sfe;
59 	struct xfs_inode		*dp;
60 	int				sbsize, nsbuf, count, i;
61 	int				error = 0;
62 
63 	ASSERT(context != NULL);
64 	dp = context->dp;
65 	ASSERT(dp != NULL);
66 	ASSERT(dp->i_afp != NULL);
67 	sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
68 	ASSERT(sf != NULL);
69 	if (!sf->hdr.count)
70 		return 0;
71 	cursor = context->cursor;
72 	ASSERT(cursor != NULL);
73 
74 	trace_xfs_attr_list_sf(context);
75 
76 	/*
77 	 * If the buffer is large enough and the cursor is at the start,
78 	 * do not bother with sorting since we will return everything in
79 	 * one buffer and another call using the cursor won't need to be
80 	 * made.
81 	 * Note the generous fudge factor of 16 overhead bytes per entry.
82 	 * If bufsize is zero then put_listent must be a search function
83 	 * and can just scan through what we have.
84 	 */
85 	if (context->bufsize == 0 ||
86 	    (XFS_ISRESET_CURSOR(cursor) &&
87 	     (dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize)) {
88 		for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
89 			if (XFS_IS_CORRUPT(context->dp->i_mount,
90 					   !xfs_attr_namecheck(sfe->nameval,
91 							       sfe->namelen)))
92 				return -EFSCORRUPTED;
93 			context->put_listent(context,
94 					     sfe->flags,
95 					     sfe->nameval,
96 					     (int)sfe->namelen,
97 					     (int)sfe->valuelen);
98 			/*
99 			 * Either search callback finished early or
100 			 * didn't fit it all in the buffer after all.
101 			 */
102 			if (context->seen_enough)
103 				break;
104 			sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
105 		}
106 		trace_xfs_attr_list_sf_all(context);
107 		return 0;
108 	}
109 
110 	/* do no more for a search callback */
111 	if (context->bufsize == 0)
112 		return 0;
113 
114 	/*
115 	 * It didn't all fit, so we have to sort everything on hashval.
116 	 */
117 	sbsize = sf->hdr.count * sizeof(*sbuf);
118 	sbp = sbuf = kmem_alloc(sbsize, KM_NOFS);
119 
120 	/*
121 	 * Scan the attribute list for the rest of the entries, storing
122 	 * the relevant info from only those that match into a buffer.
123 	 */
124 	nsbuf = 0;
125 	for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
126 		if (unlikely(
127 		    ((char *)sfe < (char *)sf) ||
128 		    ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) {
129 			XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
130 					     XFS_ERRLEVEL_LOW,
131 					     context->dp->i_mount, sfe,
132 					     sizeof(*sfe));
133 			kmem_free(sbuf);
134 			return -EFSCORRUPTED;
135 		}
136 
137 		sbp->entno = i;
138 		sbp->hash = xfs_da_hashname(sfe->nameval, sfe->namelen);
139 		sbp->name = sfe->nameval;
140 		sbp->namelen = sfe->namelen;
141 		/* These are bytes, and both on-disk, don't endian-flip */
142 		sbp->valuelen = sfe->valuelen;
143 		sbp->flags = sfe->flags;
144 		sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
145 		sbp++;
146 		nsbuf++;
147 	}
148 
149 	/*
150 	 * Sort the entries on hash then entno.
151 	 */
152 	xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);
153 
154 	/*
155 	 * Re-find our place IN THE SORTED LIST.
156 	 */
157 	count = 0;
158 	cursor->initted = 1;
159 	cursor->blkno = 0;
160 	for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {
161 		if (sbp->hash == cursor->hashval) {
162 			if (cursor->offset == count) {
163 				break;
164 			}
165 			count++;
166 		} else if (sbp->hash > cursor->hashval) {
167 			break;
168 		}
169 	}
170 	if (i == nsbuf)
171 		goto out;
172 
173 	/*
174 	 * Loop putting entries into the user buffer.
175 	 */
176 	for ( ; i < nsbuf; i++, sbp++) {
177 		if (cursor->hashval != sbp->hash) {
178 			cursor->hashval = sbp->hash;
179 			cursor->offset = 0;
180 		}
181 		if (XFS_IS_CORRUPT(context->dp->i_mount,
182 				   !xfs_attr_namecheck(sbp->name,
183 						       sbp->namelen))) {
184 			error = -EFSCORRUPTED;
185 			goto out;
186 		}
187 		context->put_listent(context,
188 				     sbp->flags,
189 				     sbp->name,
190 				     sbp->namelen,
191 				     sbp->valuelen);
192 		if (context->seen_enough)
193 			break;
194 		cursor->offset++;
195 	}
196 out:
197 	kmem_free(sbuf);
198 	return error;
199 }
200 
201 /*
202  * We didn't find the block & hash mentioned in the cursor state, so
203  * walk down the attr btree looking for the hash.
204  */
205 STATIC int
206 xfs_attr_node_list_lookup(
207 	struct xfs_attr_list_context	*context,
208 	struct attrlist_cursor_kern	*cursor,
209 	struct xfs_buf			**pbp)
210 {
211 	struct xfs_da3_icnode_hdr	nodehdr;
212 	struct xfs_da_intnode		*node;
213 	struct xfs_da_node_entry	*btree;
214 	struct xfs_inode		*dp = context->dp;
215 	struct xfs_mount		*mp = dp->i_mount;
216 	struct xfs_trans		*tp = context->tp;
217 	struct xfs_buf			*bp;
218 	int				i;
219 	int				error = 0;
220 	unsigned int			expected_level = 0;
221 	uint16_t			magic;
222 
223 	ASSERT(*pbp == NULL);
224 	cursor->blkno = 0;
225 	for (;;) {
226 		error = xfs_da3_node_read(tp, dp, cursor->blkno, &bp,
227 				XFS_ATTR_FORK);
228 		if (error)
229 			return error;
230 		node = bp->b_addr;
231 		magic = be16_to_cpu(node->hdr.info.magic);
232 		if (magic == XFS_ATTR_LEAF_MAGIC ||
233 		    magic == XFS_ATTR3_LEAF_MAGIC)
234 			break;
235 		if (magic != XFS_DA_NODE_MAGIC &&
236 		    magic != XFS_DA3_NODE_MAGIC) {
237 			XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
238 					node, sizeof(*node));
239 			goto out_corruptbuf;
240 		}
241 
242 		xfs_da3_node_hdr_from_disk(mp, &nodehdr, node);
243 
244 		/* Tree taller than we can handle; bail out! */
245 		if (nodehdr.level >= XFS_DA_NODE_MAXDEPTH)
246 			goto out_corruptbuf;
247 
248 		/* Check the level from the root node. */
249 		if (cursor->blkno == 0)
250 			expected_level = nodehdr.level - 1;
251 		else if (expected_level != nodehdr.level)
252 			goto out_corruptbuf;
253 		else
254 			expected_level--;
255 
256 		btree = nodehdr.btree;
257 		for (i = 0; i < nodehdr.count; btree++, i++) {
258 			if (cursor->hashval <= be32_to_cpu(btree->hashval)) {
259 				cursor->blkno = be32_to_cpu(btree->before);
260 				trace_xfs_attr_list_node_descend(context,
261 						btree);
262 				break;
263 			}
264 		}
265 		xfs_trans_brelse(tp, bp);
266 
267 		if (i == nodehdr.count)
268 			return 0;
269 
270 		/* We can't point back to the root. */
271 		if (XFS_IS_CORRUPT(mp, cursor->blkno == 0))
272 			return -EFSCORRUPTED;
273 	}
274 
275 	if (expected_level != 0)
276 		goto out_corruptbuf;
277 
278 	*pbp = bp;
279 	return 0;
280 
281 out_corruptbuf:
282 	xfs_buf_corruption_error(bp);
283 	xfs_trans_brelse(tp, bp);
284 	return -EFSCORRUPTED;
285 }
286 
287 STATIC int
288 xfs_attr_node_list(
289 	struct xfs_attr_list_context	*context)
290 {
291 	struct xfs_attr3_icleaf_hdr	leafhdr;
292 	struct attrlist_cursor_kern	*cursor;
293 	struct xfs_attr_leafblock	*leaf;
294 	struct xfs_da_intnode		*node;
295 	struct xfs_buf			*bp;
296 	struct xfs_inode		*dp = context->dp;
297 	struct xfs_mount		*mp = dp->i_mount;
298 	int				error = 0;
299 
300 	trace_xfs_attr_node_list(context);
301 
302 	cursor = context->cursor;
303 	cursor->initted = 1;
304 
305 	/*
306 	 * Do all sorts of validation on the passed-in cursor structure.
307 	 * If anything is amiss, ignore the cursor and look up the hashval
308 	 * starting from the btree root.
309 	 */
310 	bp = NULL;
311 	if (cursor->blkno > 0) {
312 		error = xfs_da3_node_read(context->tp, dp, cursor->blkno, &bp,
313 				XFS_ATTR_FORK);
314 		if ((error != 0) && (error != -EFSCORRUPTED))
315 			return error;
316 		if (bp) {
317 			struct xfs_attr_leaf_entry *entries;
318 
319 			node = bp->b_addr;
320 			switch (be16_to_cpu(node->hdr.info.magic)) {
321 			case XFS_DA_NODE_MAGIC:
322 			case XFS_DA3_NODE_MAGIC:
323 				trace_xfs_attr_list_wrong_blk(context);
324 				xfs_trans_brelse(context->tp, bp);
325 				bp = NULL;
326 				break;
327 			case XFS_ATTR_LEAF_MAGIC:
328 			case XFS_ATTR3_LEAF_MAGIC:
329 				leaf = bp->b_addr;
330 				xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo,
331 							     &leafhdr, leaf);
332 				entries = xfs_attr3_leaf_entryp(leaf);
333 				if (cursor->hashval > be32_to_cpu(
334 						entries[leafhdr.count - 1].hashval)) {
335 					trace_xfs_attr_list_wrong_blk(context);
336 					xfs_trans_brelse(context->tp, bp);
337 					bp = NULL;
338 				} else if (cursor->hashval <= be32_to_cpu(
339 						entries[0].hashval)) {
340 					trace_xfs_attr_list_wrong_blk(context);
341 					xfs_trans_brelse(context->tp, bp);
342 					bp = NULL;
343 				}
344 				break;
345 			default:
346 				trace_xfs_attr_list_wrong_blk(context);
347 				xfs_trans_brelse(context->tp, bp);
348 				bp = NULL;
349 			}
350 		}
351 	}
352 
353 	/*
354 	 * We did not find what we expected given the cursor's contents,
355 	 * so we start from the top and work down based on the hash value.
356 	 * Note that start of node block is same as start of leaf block.
357 	 */
358 	if (bp == NULL) {
359 		error = xfs_attr_node_list_lookup(context, cursor, &bp);
360 		if (error || !bp)
361 			return error;
362 	}
363 	ASSERT(bp != NULL);
364 
365 	/*
366 	 * Roll upward through the blocks, processing each leaf block in
367 	 * order.  As long as there is space in the result buffer, keep
368 	 * adding the information.
369 	 */
370 	for (;;) {
371 		leaf = bp->b_addr;
372 		error = xfs_attr3_leaf_list_int(bp, context);
373 		if (error)
374 			break;
375 		xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
376 		if (context->seen_enough || leafhdr.forw == 0)
377 			break;
378 		cursor->blkno = leafhdr.forw;
379 		xfs_trans_brelse(context->tp, bp);
380 		error = xfs_attr3_leaf_read(context->tp, dp, cursor->blkno,
381 					    &bp);
382 		if (error)
383 			return error;
384 	}
385 	xfs_trans_brelse(context->tp, bp);
386 	return error;
387 }
388 
389 /*
390  * Copy out attribute list entries for attr_list(), for leaf attribute lists.
391  */
392 int
393 xfs_attr3_leaf_list_int(
394 	struct xfs_buf			*bp,
395 	struct xfs_attr_list_context	*context)
396 {
397 	struct attrlist_cursor_kern	*cursor;
398 	struct xfs_attr_leafblock	*leaf;
399 	struct xfs_attr3_icleaf_hdr	ichdr;
400 	struct xfs_attr_leaf_entry	*entries;
401 	struct xfs_attr_leaf_entry	*entry;
402 	int				i;
403 	struct xfs_mount		*mp = context->dp->i_mount;
404 
405 	trace_xfs_attr_list_leaf(context);
406 
407 	leaf = bp->b_addr;
408 	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
409 	entries = xfs_attr3_leaf_entryp(leaf);
410 
411 	cursor = context->cursor;
412 	cursor->initted = 1;
413 
414 	/*
415 	 * Re-find our place in the leaf block if this is a new syscall.
416 	 */
417 	if (context->resynch) {
418 		entry = &entries[0];
419 		for (i = 0; i < ichdr.count; entry++, i++) {
420 			if (be32_to_cpu(entry->hashval) == cursor->hashval) {
421 				if (cursor->offset == context->dupcnt) {
422 					context->dupcnt = 0;
423 					break;
424 				}
425 				context->dupcnt++;
426 			} else if (be32_to_cpu(entry->hashval) >
427 					cursor->hashval) {
428 				context->dupcnt = 0;
429 				break;
430 			}
431 		}
432 		if (i == ichdr.count) {
433 			trace_xfs_attr_list_notfound(context);
434 			return 0;
435 		}
436 	} else {
437 		entry = &entries[0];
438 		i = 0;
439 	}
440 	context->resynch = 0;
441 
442 	/*
443 	 * We have found our place, start copying out the new attributes.
444 	 */
445 	for (; i < ichdr.count; entry++, i++) {
446 		char *name;
447 		int namelen, valuelen;
448 
449 		if (be32_to_cpu(entry->hashval) != cursor->hashval) {
450 			cursor->hashval = be32_to_cpu(entry->hashval);
451 			cursor->offset = 0;
452 		}
453 
454 		if ((entry->flags & XFS_ATTR_INCOMPLETE) &&
455 		    !(context->flags & ATTR_INCOMPLETE))
456 			continue;		/* skip incomplete entries */
457 
458 		if (entry->flags & XFS_ATTR_LOCAL) {
459 			xfs_attr_leaf_name_local_t *name_loc;
460 
461 			name_loc = xfs_attr3_leaf_name_local(leaf, i);
462 			name = name_loc->nameval;
463 			namelen = name_loc->namelen;
464 			valuelen = be16_to_cpu(name_loc->valuelen);
465 		} else {
466 			xfs_attr_leaf_name_remote_t *name_rmt;
467 
468 			name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
469 			name = name_rmt->name;
470 			namelen = name_rmt->namelen;
471 			valuelen = be32_to_cpu(name_rmt->valuelen);
472 		}
473 
474 		if (XFS_IS_CORRUPT(context->dp->i_mount,
475 				   !xfs_attr_namecheck(name, namelen)))
476 			return -EFSCORRUPTED;
477 		context->put_listent(context, entry->flags,
478 					      name, namelen, valuelen);
479 		if (context->seen_enough)
480 			break;
481 		cursor->offset++;
482 	}
483 	trace_xfs_attr_list_leaf_end(context);
484 	return 0;
485 }
486 
487 /*
488  * Copy out attribute entries for attr_list(), for leaf attribute lists.
489  */
490 STATIC int
491 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
492 {
493 	int error;
494 	struct xfs_buf *bp;
495 
496 	trace_xfs_attr_leaf_list(context);
497 
498 	context->cursor->blkno = 0;
499 	error = xfs_attr3_leaf_read(context->tp, context->dp, 0, &bp);
500 	if (error)
501 		return error;
502 
503 	error = xfs_attr3_leaf_list_int(bp, context);
504 	xfs_trans_brelse(context->tp, bp);
505 	return error;
506 }
507 
508 int
509 xfs_attr_list_int_ilocked(
510 	struct xfs_attr_list_context	*context)
511 {
512 	struct xfs_inode		*dp = context->dp;
513 
514 	ASSERT(xfs_isilocked(dp, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
515 
516 	/*
517 	 * Decide on what work routines to call based on the inode size.
518 	 */
519 	if (!xfs_inode_hasattr(dp))
520 		return 0;
521 	else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
522 		return xfs_attr_shortform_list(context);
523 	else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
524 		return xfs_attr_leaf_list(context);
525 	return xfs_attr_node_list(context);
526 }
527 
528 int
529 xfs_attr_list_int(
530 	xfs_attr_list_context_t *context)
531 {
532 	int error;
533 	xfs_inode_t *dp = context->dp;
534 	uint		lock_mode;
535 
536 	XFS_STATS_INC(dp->i_mount, xs_attr_list);
537 
538 	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
539 		return -EIO;
540 
541 	lock_mode = xfs_ilock_attr_map_shared(dp);
542 	error = xfs_attr_list_int_ilocked(context);
543 	xfs_iunlock(dp, lock_mode);
544 	return error;
545 }
546 
547 #define	ATTR_ENTBASESIZE		/* minimum bytes used by an attr */ \
548 	(((struct attrlist_ent *) 0)->a_name - (char *) 0)
549 #define	ATTR_ENTSIZE(namelen)		/* actual bytes used by an attr */ \
550 	((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(uint32_t)-1) \
551 	 & ~(sizeof(uint32_t)-1))
552 
553 /*
554  * Format an attribute and copy it out to the user's buffer.
555  * Take care to check values and protect against them changing later,
556  * we may be reading them directly out of a user buffer.
557  */
558 STATIC void
559 xfs_attr_put_listent(
560 	xfs_attr_list_context_t *context,
561 	int		flags,
562 	unsigned char	*name,
563 	int		namelen,
564 	int		valuelen)
565 {
566 	struct attrlist *alist = (struct attrlist *)context->alist;
567 	attrlist_ent_t *aep;
568 	int arraytop;
569 
570 	ASSERT(!context->seen_enough);
571 	ASSERT(!(context->flags & ATTR_KERNOVAL));
572 	ASSERT(context->count >= 0);
573 	ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
574 	ASSERT(context->firstu >= sizeof(*alist));
575 	ASSERT(context->firstu <= context->bufsize);
576 
577 	/*
578 	 * Only list entries in the right namespace.
579 	 */
580 	if (((context->flags & ATTR_SECURE) == 0) !=
581 	    ((flags & XFS_ATTR_SECURE) == 0))
582 		return;
583 	if (((context->flags & ATTR_ROOT) == 0) !=
584 	    ((flags & XFS_ATTR_ROOT) == 0))
585 		return;
586 
587 	arraytop = sizeof(*alist) +
588 			context->count * sizeof(alist->al_offset[0]);
589 	context->firstu -= ATTR_ENTSIZE(namelen);
590 	if (context->firstu < arraytop) {
591 		trace_xfs_attr_list_full(context);
592 		alist->al_more = 1;
593 		context->seen_enough = 1;
594 		return;
595 	}
596 
597 	aep = (attrlist_ent_t *)&context->alist[context->firstu];
598 	aep->a_valuelen = valuelen;
599 	memcpy(aep->a_name, name, namelen);
600 	aep->a_name[namelen] = 0;
601 	alist->al_offset[context->count++] = context->firstu;
602 	alist->al_count = context->count;
603 	trace_xfs_attr_list_add(context);
604 	return;
605 }
606 
607 /*
608  * Generate a list of extended attribute names and optionally
609  * also value lengths.  Positive return value follows the XFS
610  * convention of being an error, zero or negative return code
611  * is the length of the buffer returned (negated), indicating
612  * success.
613  */
614 int
615 xfs_attr_list(
616 	xfs_inode_t	*dp,
617 	char		*buffer,
618 	int		bufsize,
619 	int		flags,
620 	attrlist_cursor_kern_t *cursor)
621 {
622 	xfs_attr_list_context_t context;
623 	struct attrlist *alist;
624 	int error;
625 
626 	/*
627 	 * Validate the cursor.
628 	 */
629 	if (cursor->pad1 || cursor->pad2)
630 		return -EINVAL;
631 	if ((cursor->initted == 0) &&
632 	    (cursor->hashval || cursor->blkno || cursor->offset))
633 		return -EINVAL;
634 
635 	/* Only internal consumers can retrieve incomplete attrs. */
636 	if (flags & ATTR_INCOMPLETE)
637 		return -EINVAL;
638 
639 	/*
640 	 * Check for a properly aligned buffer.
641 	 */
642 	if (((long)buffer) & (sizeof(int)-1))
643 		return -EFAULT;
644 	if (flags & ATTR_KERNOVAL)
645 		bufsize = 0;
646 
647 	/*
648 	 * Initialize the output buffer.
649 	 */
650 	memset(&context, 0, sizeof(context));
651 	context.dp = dp;
652 	context.cursor = cursor;
653 	context.resynch = 1;
654 	context.flags = flags;
655 	context.alist = buffer;
656 	context.bufsize = (bufsize & ~(sizeof(int)-1));  /* align */
657 	context.firstu = context.bufsize;
658 	context.put_listent = xfs_attr_put_listent;
659 
660 	alist = (struct attrlist *)context.alist;
661 	alist->al_count = 0;
662 	alist->al_more = 0;
663 	alist->al_offset[0] = context.bufsize;
664 
665 	error = xfs_attr_list_int(&context);
666 	ASSERT(error <= 0);
667 	return error;
668 }
669