Line data Source code
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.h"
19 : #include "xfs_attr_remote.h"
20 : #include "xfs_trans.h"
21 : #include "xfs_bmap.h"
22 : #include "xfs_attr_leaf.h"
23 : #include "xfs_quota.h"
24 : #include "xfs_dir2.h"
25 : #include "xfs_error.h"
26 : #include "xfs_health.h"
27 :
28 : /*
29 : * Invalidate any incore buffers associated with this remote attribute value
30 : * extent. We never log remote attribute value buffers, which means that they
31 : * won't be attached to a transaction and are therefore safe to mark stale.
32 : * The actual bunmapi will be taken care of later.
33 : */
34 : STATIC int
35 408 : xfs_attr3_rmt_stale(
36 : struct xfs_inode *dp,
37 : xfs_dablk_t blkno,
38 : int blkcnt)
39 : {
40 408 : struct xfs_bmbt_irec map;
41 408 : int nmap;
42 408 : int error;
43 :
44 : /*
45 : * Roll through the "value", invalidating the attribute value's
46 : * blocks.
47 : */
48 816 : while (blkcnt > 0) {
49 : /*
50 : * Try to remember where we decided to put the value.
51 : */
52 408 : nmap = 1;
53 408 : error = xfs_bmapi_read(dp, (xfs_fileoff_t)blkno, blkcnt,
54 : &map, &nmap, XFS_BMAPI_ATTRFORK);
55 408 : if (error)
56 0 : return error;
57 408 : if (XFS_IS_CORRUPT(dp->i_mount, nmap != 1))
58 0 : return -EFSCORRUPTED;
59 :
60 : /*
61 : * Mark any incore buffers for the remote value as stale. We
62 : * never log remote attr value buffers, so the buffer should be
63 : * easy to kill.
64 : */
65 408 : error = xfs_attr_rmtval_stale(dp, &map, 0);
66 408 : if (error)
67 0 : return error;
68 :
69 408 : blkno += map.br_blockcount;
70 408 : blkcnt -= map.br_blockcount;
71 : }
72 :
73 : return 0;
74 : }
75 :
76 : /*
77 : * Invalidate all of the "remote" value regions pointed to by a particular
78 : * leaf block.
79 : * Note that we must release the lock on the buffer so that we are not
80 : * caught holding something that the logging code wants to flush to disk.
81 : */
82 : STATIC int
83 2105012 : xfs_attr3_leaf_inactive(
84 : struct xfs_trans **trans,
85 : struct xfs_inode *dp,
86 : struct xfs_buf *bp)
87 : {
88 2105012 : struct xfs_attr3_icleaf_hdr ichdr;
89 2105012 : struct xfs_mount *mp = bp->b_mount;
90 2105012 : struct xfs_attr_leafblock *leaf = bp->b_addr;
91 2105012 : struct xfs_attr_leaf_entry *entry;
92 2105012 : struct xfs_attr_leaf_name_remote *name_rmt;
93 2105012 : int error = 0;
94 2105012 : int i;
95 :
96 2105012 : xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
97 :
98 : /*
99 : * Find the remote value extents for this leaf and invalidate their
100 : * incore buffers.
101 : */
102 2104605 : entry = xfs_attr3_leaf_entryp(leaf);
103 41250266 : for (i = 0; i < ichdr.count; entry++, i++) {
104 39145283 : int blkcnt;
105 :
106 39145283 : if (!entry->nameidx || (entry->flags & XFS_ATTR_LOCAL))
107 39144875 : continue;
108 :
109 408 : name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
110 408 : if (!name_rmt->valueblk)
111 0 : continue;
112 :
113 408 : blkcnt = xfs_attr3_rmt_blocks(dp->i_mount,
114 408 : be32_to_cpu(name_rmt->valuelen));
115 408 : error = xfs_attr3_rmt_stale(dp,
116 408 : be32_to_cpu(name_rmt->valueblk), blkcnt);
117 786 : if (error)
118 0 : goto err;
119 : }
120 :
121 2104983 : xfs_trans_brelse(*trans, bp);
122 2105222 : err:
123 2105222 : return error;
124 : }
125 :
126 : /*
127 : * Recurse (gasp!) through the attribute nodes until we find leaves.
128 : * We're doing a depth-first traversal in order to invalidate everything.
129 : */
130 : STATIC int
131 42843 : xfs_attr3_node_inactive(
132 : struct xfs_trans **trans,
133 : struct xfs_inode *dp,
134 : struct xfs_buf *bp,
135 : int level)
136 : {
137 42843 : struct xfs_mount *mp = dp->i_mount;
138 42843 : struct xfs_da_blkinfo *info;
139 42843 : xfs_dablk_t child_fsb;
140 42843 : xfs_daddr_t parent_blkno, child_blkno;
141 42843 : struct xfs_buf *child_bp;
142 42843 : struct xfs_da3_icnode_hdr ichdr;
143 42843 : int error, i;
144 :
145 : /*
146 : * Since this code is recursive (gasp!) we must protect ourselves.
147 : */
148 42843 : if (level > XFS_DA_NODE_MAXDEPTH) {
149 0 : xfs_buf_mark_corrupt(bp);
150 0 : xfs_trans_brelse(*trans, bp); /* no locks for later trans */
151 0 : xfs_dirattr_mark_sick(dp, XFS_ATTR_FORK);
152 0 : return -EFSCORRUPTED;
153 : }
154 :
155 42843 : xfs_da3_node_hdr_from_disk(dp->i_mount, &ichdr, bp->b_addr);
156 42843 : parent_blkno = xfs_buf_daddr(bp);
157 42843 : if (!ichdr.count) {
158 0 : xfs_trans_brelse(*trans, bp);
159 0 : return 0;
160 : }
161 42843 : child_fsb = be32_to_cpu(ichdr.btree[0].before);
162 42843 : xfs_trans_brelse(*trans, bp); /* no locks for later trans */
163 42843 : bp = NULL;
164 :
165 : /*
166 : * If this is the node level just above the leaves, simply loop
167 : * over the leaves removing all of them. If this is higher up
168 : * in the tree, recurse downward.
169 : */
170 134597 : for (i = 0; i < ichdr.count; i++) {
171 : /*
172 : * Read the subsidiary block to see what we have to work with.
173 : * Don't do this in a transaction. This is a depth-first
174 : * traversal of the tree so we may deal with many blocks
175 : * before we come back to this one.
176 : */
177 91754 : error = xfs_da3_node_read(*trans, dp, child_fsb, &child_bp,
178 : XFS_ATTR_FORK);
179 91754 : if (error)
180 0 : return error;
181 :
182 : /* save for re-read later */
183 91754 : child_blkno = xfs_buf_daddr(child_bp);
184 :
185 : /*
186 : * Invalidate the subtree, however we have to.
187 : */
188 91754 : info = child_bp->b_addr;
189 91754 : switch (info->magic) {
190 0 : case cpu_to_be16(XFS_DA_NODE_MAGIC):
191 : case cpu_to_be16(XFS_DA3_NODE_MAGIC):
192 0 : error = xfs_attr3_node_inactive(trans, dp, child_bp,
193 : level + 1);
194 0 : break;
195 91754 : case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
196 : case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
197 91754 : error = xfs_attr3_leaf_inactive(trans, dp, child_bp);
198 91754 : break;
199 : default:
200 0 : xfs_buf_mark_corrupt(child_bp);
201 0 : xfs_trans_brelse(*trans, child_bp);
202 0 : xfs_dirattr_mark_sick(dp, XFS_ATTR_FORK);
203 0 : error = -EFSCORRUPTED;
204 0 : break;
205 : }
206 91754 : if (error)
207 0 : return error;
208 :
209 : /*
210 : * Remove the subsidiary block from the cache and from the log.
211 : */
212 91754 : error = xfs_trans_get_buf(*trans, mp->m_ddev_targp,
213 : child_blkno,
214 91754 : XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0,
215 : &child_bp);
216 91754 : if (error)
217 0 : return error;
218 91754 : xfs_trans_binval(*trans, child_bp);
219 91754 : child_bp = NULL;
220 :
221 : /*
222 : * If we're not done, re-read the parent to get the next
223 : * child block number.
224 : */
225 91754 : if (i + 1 < ichdr.count) {
226 48911 : struct xfs_da3_icnode_hdr phdr;
227 :
228 48911 : error = xfs_da3_node_read_mapped(*trans, dp,
229 : parent_blkno, &bp, XFS_ATTR_FORK);
230 48911 : if (error)
231 0 : return error;
232 48911 : xfs_da3_node_hdr_from_disk(dp->i_mount, &phdr,
233 48911 : bp->b_addr);
234 48911 : child_fsb = be32_to_cpu(phdr.btree[i + 1].before);
235 48911 : xfs_trans_brelse(*trans, bp);
236 48911 : bp = NULL;
237 : }
238 : /*
239 : * Atomically commit the whole invalidate stuff.
240 : */
241 91754 : error = xfs_trans_roll_inode(trans, dp);
242 91754 : if (error)
243 0 : return error;
244 : }
245 :
246 : return 0;
247 : }
248 :
249 : /*
250 : * Indiscriminately delete the entire attribute fork
251 : *
252 : * Recurse (gasp!) through the attribute nodes until we find leaves.
253 : * We're doing a depth-first traversal in order to invalidate everything.
254 : */
255 : static int
256 2056327 : xfs_attr3_root_inactive(
257 : struct xfs_trans **trans,
258 : struct xfs_inode *dp)
259 : {
260 2056327 : struct xfs_mount *mp = dp->i_mount;
261 2056327 : struct xfs_da_blkinfo *info;
262 2056327 : struct xfs_buf *bp;
263 2056327 : xfs_daddr_t blkno;
264 2056327 : int error;
265 :
266 : /*
267 : * Read block 0 to see what we have to work with.
268 : * We only get here if we have extents, since we remove
269 : * the extents in reverse order the extent containing
270 : * block 0 must still be there.
271 : */
272 2056327 : error = xfs_da3_node_read(*trans, dp, 0, &bp, XFS_ATTR_FORK);
273 2055959 : if (error)
274 : return error;
275 2055959 : blkno = xfs_buf_daddr(bp);
276 :
277 : /*
278 : * Invalidate the tree, even if the "tree" is only a single leaf block.
279 : * This is a depth-first traversal!
280 : */
281 2055959 : info = bp->b_addr;
282 2055959 : switch (info->magic) {
283 42843 : case cpu_to_be16(XFS_DA_NODE_MAGIC):
284 : case cpu_to_be16(XFS_DA3_NODE_MAGIC):
285 42843 : error = xfs_attr3_node_inactive(trans, dp, bp, 1);
286 42843 : break;
287 2013116 : case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
288 : case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
289 2013116 : error = xfs_attr3_leaf_inactive(trans, dp, bp);
290 2013116 : break;
291 0 : default:
292 0 : xfs_dirattr_mark_sick(dp, XFS_ATTR_FORK);
293 0 : error = -EFSCORRUPTED;
294 0 : xfs_buf_mark_corrupt(bp);
295 0 : xfs_trans_brelse(*trans, bp);
296 0 : break;
297 : }
298 2056374 : if (error)
299 0 : return error;
300 :
301 : /*
302 : * Invalidate the incore copy of the root block.
303 : */
304 2056610 : error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, blkno,
305 2056610 : XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, &bp);
306 2056541 : if (error)
307 : return error;
308 2056541 : error = bp->b_error;
309 2056541 : if (error) {
310 0 : xfs_trans_brelse(*trans, bp);
311 0 : return error;
312 : }
313 2056541 : xfs_trans_binval(*trans, bp); /* remove from cache */
314 : /*
315 : * Commit the invalidate and start the next transaction.
316 : */
317 2056556 : error = xfs_trans_roll_inode(trans, dp);
318 :
319 2056556 : return error;
320 : }
321 :
322 : /*
323 : * xfs_attr_inactive kills all traces of an attribute fork on an inode. It
324 : * removes both the on-disk and in-memory inode fork. Note that this also has to
325 : * handle the condition of inodes without attributes but with an attribute fork
326 : * configured, so we can't use xfs_inode_hasattr() here.
327 : *
328 : * The in-memory attribute fork is removed even on error.
329 : */
330 : int
331 37371498 : xfs_attr_inactive(
332 : struct xfs_inode *dp)
333 : {
334 37371498 : struct xfs_trans *trans;
335 37371498 : struct xfs_mount *mp;
336 37371498 : int lock_mode = XFS_ILOCK_SHARED;
337 37371498 : int error = 0;
338 :
339 37371498 : mp = dp->i_mount;
340 37371498 : ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
341 :
342 37371498 : xfs_ilock(dp, lock_mode);
343 37369877 : if (!xfs_inode_has_attr_fork(dp))
344 0 : goto out_destroy_fork;
345 37369877 : xfs_iunlock(dp, lock_mode);
346 :
347 37369645 : lock_mode = 0;
348 :
349 37369645 : error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans);
350 37376956 : if (error)
351 196 : goto out_destroy_fork;
352 :
353 37376760 : lock_mode = XFS_ILOCK_EXCL;
354 37376760 : xfs_ilock(dp, lock_mode);
355 :
356 37376847 : if (!xfs_inode_has_attr_fork(dp))
357 0 : goto out_cancel;
358 :
359 : /*
360 : * No need to make quota reservations here. We expect to release some
361 : * blocks, not allocate, in the common case.
362 : */
363 37376847 : xfs_trans_ijoin(trans, dp, 0);
364 :
365 : /*
366 : * Invalidate and truncate the attribute fork extents. Make sure the
367 : * fork actually has xattr blocks as otherwise the invalidation has no
368 : * blocks to read and returns an error. In this case, just do the fork
369 : * removal below.
370 : */
371 37371347 : if (dp->i_af.if_nextents > 0) {
372 2056068 : error = xfs_attr3_root_inactive(&trans, dp);
373 2056290 : if (error)
374 0 : goto out_cancel;
375 :
376 2056290 : error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
377 2056672 : if (error)
378 0 : goto out_cancel;
379 : }
380 :
381 : /* Reset the attribute fork - this also destroys the in-core fork */
382 37371951 : xfs_attr_fork_remove(dp, trans);
383 :
384 37376621 : error = xfs_trans_commit(trans);
385 37374525 : xfs_iunlock(dp, lock_mode);
386 37374525 : return error;
387 :
388 0 : out_cancel:
389 0 : xfs_trans_cancel(trans);
390 196 : out_destroy_fork:
391 : /* kill the in-core attr fork before we drop the inode lock */
392 196 : xfs_ifork_zap_attr(dp);
393 196 : if (lock_mode)
394 0 : xfs_iunlock(dp, lock_mode);
395 : return error;
396 : }
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