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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_bit.h"
14#include "xfs_mount.h"
15#include "xfs_da_format.h"
16#include "xfs_da_btree.h"
17#include "xfs_inode.h"
18#include "xfs_attr_remote.h"
19#include "xfs_trans.h"
20#include "xfs_bmap.h"
21#include "xfs_attr.h"
22#include "xfs_attr_leaf.h"
23#include "xfs_quota.h"
24#include "xfs_dir2.h"
25#include "xfs_error.h"
26
27/*
28 * Invalidate any incore buffers associated with this remote attribute value
29 * extent. We never log remote attribute value buffers, which means that they
30 * won't be attached to a transaction and are therefore safe to mark stale.
31 * The actual bunmapi will be taken care of later.
32 */
33STATIC int
34xfs_attr3_rmt_stale(
35 struct xfs_inode *dp,
36 xfs_dablk_t blkno,
37 int blkcnt)
38{
39 struct xfs_bmbt_irec map;
40 int nmap;
41 int error;
42
43 /*
44 * Roll through the "value", invalidating the attribute value's
45 * blocks.
46 */
47 while (blkcnt > 0) {
48 /*
49 * Try to remember where we decided to put the value.
50 */
51 nmap = 1;
52 error = xfs_bmapi_read(dp, (xfs_fileoff_t)blkno, blkcnt,
53 &map, &nmap, XFS_BMAPI_ATTRFORK);
54 if (error)
55 return error;
56 if (XFS_IS_CORRUPT(dp->i_mount, nmap != 1))
57 return -EFSCORRUPTED;
58
59 /*
60 * Mark any incore buffers for the remote value as stale. We
61 * never log remote attr value buffers, so the buffer should be
62 * easy to kill.
63 */
64 error = xfs_attr_rmtval_stale(dp, &map, 0);
65 if (error)
66 return error;
67
68 blkno += map.br_blockcount;
69 blkcnt -= map.br_blockcount;
70 }
71
72 return 0;
73}
74
75/*
76 * Invalidate all of the "remote" value regions pointed to by a particular
77 * leaf block.
78 * Note that we must release the lock on the buffer so that we are not
79 * caught holding something that the logging code wants to flush to disk.
80 */
81STATIC int
82xfs_attr3_leaf_inactive(
83 struct xfs_trans **trans,
84 struct xfs_inode *dp,
85 struct xfs_buf *bp)
86{
87 struct xfs_attr3_icleaf_hdr ichdr;
88 struct xfs_mount *mp = bp->b_mount;
89 struct xfs_attr_leafblock *leaf = bp->b_addr;
90 struct xfs_attr_leaf_entry *entry;
91 struct xfs_attr_leaf_name_remote *name_rmt;
92 int error = 0;
93 int i;
94
95 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
96
97 /*
98 * Find the remote value extents for this leaf and invalidate their
99 * incore buffers.
100 */
101 entry = xfs_attr3_leaf_entryp(leaf);
102 for (i = 0; i < ichdr.count; entry++, i++) {
103 int blkcnt;
104
105 if (!entry->nameidx || (entry->flags & XFS_ATTR_LOCAL))
106 continue;
107
108 name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
109 if (!name_rmt->valueblk)
110 continue;
111
112 blkcnt = xfs_attr3_rmt_blocks(dp->i_mount,
113 be32_to_cpu(name_rmt->valuelen));
114 error = xfs_attr3_rmt_stale(dp,
115 be32_to_cpu(name_rmt->valueblk), blkcnt);
116 if (error)
117 goto err;
118 }
119
120 xfs_trans_brelse(*trans, bp);
121err:
122 return error;
123}
124
125/*
126 * Recurse (gasp!) through the attribute nodes until we find leaves.
127 * We're doing a depth-first traversal in order to invalidate everything.
128 */
129STATIC int
130xfs_attr3_node_inactive(
131 struct xfs_trans **trans,
132 struct xfs_inode *dp,
133 struct xfs_buf *bp,
134 int level)
135{
136 struct xfs_mount *mp = dp->i_mount;
137 struct xfs_da_blkinfo *info;
138 xfs_dablk_t child_fsb;
139 xfs_daddr_t parent_blkno, child_blkno;
140 struct xfs_buf *child_bp;
141 struct xfs_da3_icnode_hdr ichdr;
142 int error, i;
143
144 /*
145 * Since this code is recursive (gasp!) we must protect ourselves.
146 */
147 if (level > XFS_DA_NODE_MAXDEPTH) {
148 xfs_buf_mark_corrupt(bp);
149 xfs_trans_brelse(*trans, bp); /* no locks for later trans */
150 return -EFSCORRUPTED;
151 }
152
153 xfs_da3_node_hdr_from_disk(dp->i_mount, &ichdr, bp->b_addr);
154 parent_blkno = bp->b_bn;
155 if (!ichdr.count) {
156 xfs_trans_brelse(*trans, bp);
157 return 0;
158 }
159 child_fsb = be32_to_cpu(ichdr.btree[0].before);
160 xfs_trans_brelse(*trans, bp); /* no locks for later trans */
161
162 /*
163 * If this is the node level just above the leaves, simply loop
164 * over the leaves removing all of them. If this is higher up
165 * in the tree, recurse downward.
166 */
167 for (i = 0; i < ichdr.count; i++) {
168 /*
169 * Read the subsidiary block to see what we have to work with.
170 * Don't do this in a transaction. This is a depth-first
171 * traversal of the tree so we may deal with many blocks
172 * before we come back to this one.
173 */
174 error = xfs_da3_node_read(*trans, dp, child_fsb, &child_bp,
175 XFS_ATTR_FORK);
176 if (error)
177 return error;
178
179 /* save for re-read later */
180 child_blkno = XFS_BUF_ADDR(child_bp);
181
182 /*
183 * Invalidate the subtree, however we have to.
184 */
185 info = child_bp->b_addr;
186 switch (info->magic) {
187 case cpu_to_be16(XFS_DA_NODE_MAGIC):
188 case cpu_to_be16(XFS_DA3_NODE_MAGIC):
189 error = xfs_attr3_node_inactive(trans, dp, child_bp,
190 level + 1);
191 break;
192 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
193 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
194 error = xfs_attr3_leaf_inactive(trans, dp, child_bp);
195 break;
196 default:
197 xfs_buf_mark_corrupt(child_bp);
198 xfs_trans_brelse(*trans, child_bp);
199 error = -EFSCORRUPTED;
200 break;
201 }
202 if (error)
203 return error;
204
205 /*
206 * Remove the subsidiary block from the cache and from the log.
207 */
208 error = xfs_trans_get_buf(*trans, mp->m_ddev_targp,
209 child_blkno,
210 XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0,
211 &child_bp);
212 if (error)
213 return error;
214 error = bp->b_error;
215 if (error) {
216 xfs_trans_brelse(*trans, child_bp);
217 return error;
218 }
219 xfs_trans_binval(*trans, child_bp);
220
221 /*
222 * If we're not done, re-read the parent to get the next
223 * child block number.
224 */
225 if (i + 1 < ichdr.count) {
226 struct xfs_da3_icnode_hdr phdr;
227
228 error = xfs_da3_node_read_mapped(*trans, dp,
229 parent_blkno, &bp, XFS_ATTR_FORK);
230 if (error)
231 return error;
232 xfs_da3_node_hdr_from_disk(dp->i_mount, &phdr,
233 bp->b_addr);
234 child_fsb = be32_to_cpu(phdr.btree[i + 1].before);
235 xfs_trans_brelse(*trans, bp);
236 }
237 /*
238 * Atomically commit the whole invalidate stuff.
239 */
240 error = xfs_trans_roll_inode(trans, dp);
241 if (error)
242 return error;
243 }
244
245 return 0;
246}
247
248/*
249 * Indiscriminately delete the entire attribute fork
250 *
251 * Recurse (gasp!) through the attribute nodes until we find leaves.
252 * We're doing a depth-first traversal in order to invalidate everything.
253 */
254static int
255xfs_attr3_root_inactive(
256 struct xfs_trans **trans,
257 struct xfs_inode *dp)
258{
259 struct xfs_mount *mp = dp->i_mount;
260 struct xfs_da_blkinfo *info;
261 struct xfs_buf *bp;
262 xfs_daddr_t blkno;
263 int error;
264
265 /*
266 * Read block 0 to see what we have to work with.
267 * We only get here if we have extents, since we remove
268 * the extents in reverse order the extent containing
269 * block 0 must still be there.
270 */
271 error = xfs_da3_node_read(*trans, dp, 0, &bp, XFS_ATTR_FORK);
272 if (error)
273 return error;
274 blkno = bp->b_bn;
275
276 /*
277 * Invalidate the tree, even if the "tree" is only a single leaf block.
278 * This is a depth-first traversal!
279 */
280 info = bp->b_addr;
281 switch (info->magic) {
282 case cpu_to_be16(XFS_DA_NODE_MAGIC):
283 case cpu_to_be16(XFS_DA3_NODE_MAGIC):
284 error = xfs_attr3_node_inactive(trans, dp, bp, 1);
285 break;
286 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
287 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
288 error = xfs_attr3_leaf_inactive(trans, dp, bp);
289 break;
290 default:
291 error = -EFSCORRUPTED;
292 xfs_buf_mark_corrupt(bp);
293 xfs_trans_brelse(*trans, bp);
294 break;
295 }
296 if (error)
297 return error;
298
299 /*
300 * Invalidate the incore copy of the root block.
301 */
302 error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, blkno,
303 XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, &bp);
304 if (error)
305 return error;
306 error = bp->b_error;
307 if (error) {
308 xfs_trans_brelse(*trans, bp);
309 return error;
310 }
311 xfs_trans_binval(*trans, bp); /* remove from cache */
312 /*
313 * Commit the invalidate and start the next transaction.
314 */
315 error = xfs_trans_roll_inode(trans, dp);
316
317 return error;
318}
319
320/*
321 * xfs_attr_inactive kills all traces of an attribute fork on an inode. It
322 * removes both the on-disk and in-memory inode fork. Note that this also has to
323 * handle the condition of inodes without attributes but with an attribute fork
324 * configured, so we can't use xfs_inode_hasattr() here.
325 *
326 * The in-memory attribute fork is removed even on error.
327 */
328int
329xfs_attr_inactive(
330 struct xfs_inode *dp)
331{
332 struct xfs_trans *trans;
333 struct xfs_mount *mp;
334 int lock_mode = XFS_ILOCK_SHARED;
335 int error = 0;
336
337 mp = dp->i_mount;
338 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
339
340 xfs_ilock(dp, lock_mode);
341 if (!XFS_IFORK_Q(dp))
342 goto out_destroy_fork;
343 xfs_iunlock(dp, lock_mode);
344
345 lock_mode = 0;
346
347 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans);
348 if (error)
349 goto out_destroy_fork;
350
351 lock_mode = XFS_ILOCK_EXCL;
352 xfs_ilock(dp, lock_mode);
353
354 if (!XFS_IFORK_Q(dp))
355 goto out_cancel;
356
357 /*
358 * No need to make quota reservations here. We expect to release some
359 * blocks, not allocate, in the common case.
360 */
361 xfs_trans_ijoin(trans, dp, 0);
362
363 /*
364 * Invalidate and truncate the attribute fork extents. Make sure the
365 * fork actually has attributes as otherwise the invalidation has no
366 * blocks to read and returns an error. In this case, just do the fork
367 * removal below.
368 */
369 if (xfs_inode_hasattr(dp) &&
370 dp->i_afp->if_format != XFS_DINODE_FMT_LOCAL) {
371 error = xfs_attr3_root_inactive(&trans, dp);
372 if (error)
373 goto out_cancel;
374
375 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
376 if (error)
377 goto out_cancel;
378 }
379
380 /* Reset the attribute fork - this also destroys the in-core fork */
381 xfs_attr_fork_remove(dp, trans);
382
383 error = xfs_trans_commit(trans);
384 xfs_iunlock(dp, lock_mode);
385 return error;
386
387out_cancel:
388 xfs_trans_cancel(trans);
389out_destroy_fork:
390 /* kill the in-core attr fork before we drop the inode lock */
391 if (dp->i_afp) {
392 xfs_idestroy_fork(dp->i_afp);
393 kmem_cache_free(xfs_ifork_zone, dp->i_afp);
394 dp->i_afp = NULL;
395 }
396 if (lock_mode)
397 xfs_iunlock(dp, lock_mode);
398 return error;
399}
1/*
2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * Copyright (c) 2013 Red Hat, Inc.
4 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_shared.h"
22#include "xfs_format.h"
23#include "xfs_log_format.h"
24#include "xfs_trans_resv.h"
25#include "xfs_bit.h"
26#include "xfs_mount.h"
27#include "xfs_da_format.h"
28#include "xfs_da_btree.h"
29#include "xfs_inode.h"
30#include "xfs_alloc.h"
31#include "xfs_attr_remote.h"
32#include "xfs_trans.h"
33#include "xfs_inode_item.h"
34#include "xfs_bmap.h"
35#include "xfs_attr.h"
36#include "xfs_attr_leaf.h"
37#include "xfs_error.h"
38#include "xfs_quota.h"
39#include "xfs_trace.h"
40#include "xfs_dir2.h"
41
42/*
43 * Look at all the extents for this logical region,
44 * invalidate any buffers that are incore/in transactions.
45 */
46STATIC int
47xfs_attr3_leaf_freextent(
48 struct xfs_trans **trans,
49 struct xfs_inode *dp,
50 xfs_dablk_t blkno,
51 int blkcnt)
52{
53 struct xfs_bmbt_irec map;
54 struct xfs_buf *bp;
55 xfs_dablk_t tblkno;
56 xfs_daddr_t dblkno;
57 int tblkcnt;
58 int dblkcnt;
59 int nmap;
60 int error;
61
62 /*
63 * Roll through the "value", invalidating the attribute value's
64 * blocks.
65 */
66 tblkno = blkno;
67 tblkcnt = blkcnt;
68 while (tblkcnt > 0) {
69 /*
70 * Try to remember where we decided to put the value.
71 */
72 nmap = 1;
73 error = xfs_bmapi_read(dp, (xfs_fileoff_t)tblkno, tblkcnt,
74 &map, &nmap, XFS_BMAPI_ATTRFORK);
75 if (error) {
76 return error;
77 }
78 ASSERT(nmap == 1);
79 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
80
81 /*
82 * If it's a hole, these are already unmapped
83 * so there's nothing to invalidate.
84 */
85 if (map.br_startblock != HOLESTARTBLOCK) {
86
87 dblkno = XFS_FSB_TO_DADDR(dp->i_mount,
88 map.br_startblock);
89 dblkcnt = XFS_FSB_TO_BB(dp->i_mount,
90 map.br_blockcount);
91 bp = xfs_trans_get_buf(*trans,
92 dp->i_mount->m_ddev_targp,
93 dblkno, dblkcnt, 0);
94 if (!bp)
95 return -ENOMEM;
96 xfs_trans_binval(*trans, bp);
97 /*
98 * Roll to next transaction.
99 */
100 error = xfs_trans_roll(trans, dp);
101 if (error)
102 return error;
103 }
104
105 tblkno += map.br_blockcount;
106 tblkcnt -= map.br_blockcount;
107 }
108
109 return 0;
110}
111
112/*
113 * Invalidate all of the "remote" value regions pointed to by a particular
114 * leaf block.
115 * Note that we must release the lock on the buffer so that we are not
116 * caught holding something that the logging code wants to flush to disk.
117 */
118STATIC int
119xfs_attr3_leaf_inactive(
120 struct xfs_trans **trans,
121 struct xfs_inode *dp,
122 struct xfs_buf *bp)
123{
124 struct xfs_attr_leafblock *leaf;
125 struct xfs_attr3_icleaf_hdr ichdr;
126 struct xfs_attr_leaf_entry *entry;
127 struct xfs_attr_leaf_name_remote *name_rmt;
128 struct xfs_attr_inactive_list *list;
129 struct xfs_attr_inactive_list *lp;
130 int error;
131 int count;
132 int size;
133 int tmp;
134 int i;
135 struct xfs_mount *mp = bp->b_target->bt_mount;
136
137 leaf = bp->b_addr;
138 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
139
140 /*
141 * Count the number of "remote" value extents.
142 */
143 count = 0;
144 entry = xfs_attr3_leaf_entryp(leaf);
145 for (i = 0; i < ichdr.count; entry++, i++) {
146 if (be16_to_cpu(entry->nameidx) &&
147 ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
148 name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
149 if (name_rmt->valueblk)
150 count++;
151 }
152 }
153
154 /*
155 * If there are no "remote" values, we're done.
156 */
157 if (count == 0) {
158 xfs_trans_brelse(*trans, bp);
159 return 0;
160 }
161
162 /*
163 * Allocate storage for a list of all the "remote" value extents.
164 */
165 size = count * sizeof(xfs_attr_inactive_list_t);
166 list = kmem_alloc(size, KM_SLEEP);
167
168 /*
169 * Identify each of the "remote" value extents.
170 */
171 lp = list;
172 entry = xfs_attr3_leaf_entryp(leaf);
173 for (i = 0; i < ichdr.count; entry++, i++) {
174 if (be16_to_cpu(entry->nameidx) &&
175 ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
176 name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
177 if (name_rmt->valueblk) {
178 lp->valueblk = be32_to_cpu(name_rmt->valueblk);
179 lp->valuelen = xfs_attr3_rmt_blocks(dp->i_mount,
180 be32_to_cpu(name_rmt->valuelen));
181 lp++;
182 }
183 }
184 }
185 xfs_trans_brelse(*trans, bp); /* unlock for trans. in freextent() */
186
187 /*
188 * Invalidate each of the "remote" value extents.
189 */
190 error = 0;
191 for (lp = list, i = 0; i < count; i++, lp++) {
192 tmp = xfs_attr3_leaf_freextent(trans, dp,
193 lp->valueblk, lp->valuelen);
194
195 if (error == 0)
196 error = tmp; /* save only the 1st errno */
197 }
198
199 kmem_free(list);
200 return error;
201}
202
203/*
204 * Recurse (gasp!) through the attribute nodes until we find leaves.
205 * We're doing a depth-first traversal in order to invalidate everything.
206 */
207STATIC int
208xfs_attr3_node_inactive(
209 struct xfs_trans **trans,
210 struct xfs_inode *dp,
211 struct xfs_buf *bp,
212 int level)
213{
214 xfs_da_blkinfo_t *info;
215 xfs_da_intnode_t *node;
216 xfs_dablk_t child_fsb;
217 xfs_daddr_t parent_blkno, child_blkno;
218 int error, i;
219 struct xfs_buf *child_bp;
220 struct xfs_da_node_entry *btree;
221 struct xfs_da3_icnode_hdr ichdr;
222
223 /*
224 * Since this code is recursive (gasp!) we must protect ourselves.
225 */
226 if (level > XFS_DA_NODE_MAXDEPTH) {
227 xfs_trans_brelse(*trans, bp); /* no locks for later trans */
228 return -EIO;
229 }
230
231 node = bp->b_addr;
232 dp->d_ops->node_hdr_from_disk(&ichdr, node);
233 parent_blkno = bp->b_bn;
234 if (!ichdr.count) {
235 xfs_trans_brelse(*trans, bp);
236 return 0;
237 }
238 btree = dp->d_ops->node_tree_p(node);
239 child_fsb = be32_to_cpu(btree[0].before);
240 xfs_trans_brelse(*trans, bp); /* no locks for later trans */
241
242 /*
243 * If this is the node level just above the leaves, simply loop
244 * over the leaves removing all of them. If this is higher up
245 * in the tree, recurse downward.
246 */
247 for (i = 0; i < ichdr.count; i++) {
248 /*
249 * Read the subsidiary block to see what we have to work with.
250 * Don't do this in a transaction. This is a depth-first
251 * traversal of the tree so we may deal with many blocks
252 * before we come back to this one.
253 */
254 error = xfs_da3_node_read(*trans, dp, child_fsb, -2, &child_bp,
255 XFS_ATTR_FORK);
256 if (error)
257 return error;
258 if (child_bp) {
259 /* save for re-read later */
260 child_blkno = XFS_BUF_ADDR(child_bp);
261
262 /*
263 * Invalidate the subtree, however we have to.
264 */
265 info = child_bp->b_addr;
266 switch (info->magic) {
267 case cpu_to_be16(XFS_DA_NODE_MAGIC):
268 case cpu_to_be16(XFS_DA3_NODE_MAGIC):
269 error = xfs_attr3_node_inactive(trans, dp,
270 child_bp, level + 1);
271 break;
272 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
273 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
274 error = xfs_attr3_leaf_inactive(trans, dp,
275 child_bp);
276 break;
277 default:
278 error = -EIO;
279 xfs_trans_brelse(*trans, child_bp);
280 break;
281 }
282 if (error)
283 return error;
284
285 /*
286 * Remove the subsidiary block from the cache
287 * and from the log.
288 */
289 error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
290 &child_bp, XFS_ATTR_FORK);
291 if (error)
292 return error;
293 xfs_trans_binval(*trans, child_bp);
294 }
295
296 /*
297 * If we're not done, re-read the parent to get the next
298 * child block number.
299 */
300 if (i + 1 < ichdr.count) {
301 error = xfs_da3_node_read(*trans, dp, 0, parent_blkno,
302 &bp, XFS_ATTR_FORK);
303 if (error)
304 return error;
305 child_fsb = be32_to_cpu(btree[i + 1].before);
306 xfs_trans_brelse(*trans, bp);
307 }
308 /*
309 * Atomically commit the whole invalidate stuff.
310 */
311 error = xfs_trans_roll(trans, dp);
312 if (error)
313 return error;
314 }
315
316 return 0;
317}
318
319/*
320 * Indiscriminately delete the entire attribute fork
321 *
322 * Recurse (gasp!) through the attribute nodes until we find leaves.
323 * We're doing a depth-first traversal in order to invalidate everything.
324 */
325static int
326xfs_attr3_root_inactive(
327 struct xfs_trans **trans,
328 struct xfs_inode *dp)
329{
330 struct xfs_da_blkinfo *info;
331 struct xfs_buf *bp;
332 xfs_daddr_t blkno;
333 int error;
334
335 /*
336 * Read block 0 to see what we have to work with.
337 * We only get here if we have extents, since we remove
338 * the extents in reverse order the extent containing
339 * block 0 must still be there.
340 */
341 error = xfs_da3_node_read(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
342 if (error)
343 return error;
344 blkno = bp->b_bn;
345
346 /*
347 * Invalidate the tree, even if the "tree" is only a single leaf block.
348 * This is a depth-first traversal!
349 */
350 info = bp->b_addr;
351 switch (info->magic) {
352 case cpu_to_be16(XFS_DA_NODE_MAGIC):
353 case cpu_to_be16(XFS_DA3_NODE_MAGIC):
354 error = xfs_attr3_node_inactive(trans, dp, bp, 1);
355 break;
356 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
357 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
358 error = xfs_attr3_leaf_inactive(trans, dp, bp);
359 break;
360 default:
361 error = -EIO;
362 xfs_trans_brelse(*trans, bp);
363 break;
364 }
365 if (error)
366 return error;
367
368 /*
369 * Invalidate the incore copy of the root block.
370 */
371 error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK);
372 if (error)
373 return error;
374 xfs_trans_binval(*trans, bp); /* remove from cache */
375 /*
376 * Commit the invalidate and start the next transaction.
377 */
378 error = xfs_trans_roll(trans, dp);
379
380 return error;
381}
382
383/*
384 * xfs_attr_inactive kills all traces of an attribute fork on an inode. It
385 * removes both the on-disk and in-memory inode fork. Note that this also has to
386 * handle the condition of inodes without attributes but with an attribute fork
387 * configured, so we can't use xfs_inode_hasattr() here.
388 *
389 * The in-memory attribute fork is removed even on error.
390 */
391int
392xfs_attr_inactive(
393 struct xfs_inode *dp)
394{
395 struct xfs_trans *trans;
396 struct xfs_mount *mp;
397 int lock_mode = XFS_ILOCK_SHARED;
398 int error = 0;
399
400 mp = dp->i_mount;
401 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
402
403 xfs_ilock(dp, lock_mode);
404 if (!XFS_IFORK_Q(dp))
405 goto out_destroy_fork;
406 xfs_iunlock(dp, lock_mode);
407
408 lock_mode = 0;
409
410 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans);
411 if (error)
412 goto out_destroy_fork;
413
414 lock_mode = XFS_ILOCK_EXCL;
415 xfs_ilock(dp, lock_mode);
416
417 if (!XFS_IFORK_Q(dp))
418 goto out_cancel;
419
420 /*
421 * No need to make quota reservations here. We expect to release some
422 * blocks, not allocate, in the common case.
423 */
424 xfs_trans_ijoin(trans, dp, 0);
425
426 /*
427 * Invalidate and truncate the attribute fork extents. Make sure the
428 * fork actually has attributes as otherwise the invalidation has no
429 * blocks to read and returns an error. In this case, just do the fork
430 * removal below.
431 */
432 if (xfs_inode_hasattr(dp) &&
433 dp->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) {
434 error = xfs_attr3_root_inactive(&trans, dp);
435 if (error)
436 goto out_cancel;
437
438 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
439 if (error)
440 goto out_cancel;
441 }
442
443 /* Reset the attribute fork - this also destroys the in-core fork */
444 xfs_attr_fork_remove(dp, trans);
445
446 error = xfs_trans_commit(trans);
447 xfs_iunlock(dp, lock_mode);
448 return error;
449
450out_cancel:
451 xfs_trans_cancel(trans);
452out_destroy_fork:
453 /* kill the in-core attr fork before we drop the inode lock */
454 if (dp->i_afp)
455 xfs_idestroy_fork(dp, XFS_ATTR_FORK);
456 if (lock_mode)
457 xfs_iunlock(dp, lock_mode);
458 return error;
459}