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-rw-r--r--fs/xfs/xfs_attr_inactive.c453
1 files changed, 453 insertions, 0 deletions
diff --git a/fs/xfs/xfs_attr_inactive.c b/fs/xfs/xfs_attr_inactive.c
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index 000000000000..bb24b07cbedb
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+++ b/fs/xfs/xfs_attr_inactive.c
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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_format.h"
22#include "xfs_bit.h"
23#include "xfs_log.h"
24#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_mount.h"
28#include "xfs_da_btree.h"
29#include "xfs_bmap_btree.h"
30#include "xfs_alloc_btree.h"
31#include "xfs_ialloc_btree.h"
32#include "xfs_alloc.h"
33#include "xfs_btree.h"
34#include "xfs_attr_remote.h"
35#include "xfs_dinode.h"
36#include "xfs_inode.h"
37#include "xfs_inode_item.h"
38#include "xfs_bmap.h"
39#include "xfs_attr.h"
40#include "xfs_attr_leaf.h"
41#include "xfs_error.h"
42#include "xfs_quota.h"
43#include "xfs_trace.h"
44#include "xfs_trans_priv.h"
45
46/*
47 * Look at all the extents for this logical region,
48 * invalidate any buffers that are incore/in transactions.
49 */
50STATIC int
51xfs_attr3_leaf_freextent(
52 struct xfs_trans **trans,
53 struct xfs_inode *dp,
54 xfs_dablk_t blkno,
55 int blkcnt)
56{
57 struct xfs_bmbt_irec map;
58 struct xfs_buf *bp;
59 xfs_dablk_t tblkno;
60 xfs_daddr_t dblkno;
61 int tblkcnt;
62 int dblkcnt;
63 int nmap;
64 int error;
65
66 /*
67 * Roll through the "value", invalidating the attribute value's
68 * blocks.
69 */
70 tblkno = blkno;
71 tblkcnt = blkcnt;
72 while (tblkcnt > 0) {
73 /*
74 * Try to remember where we decided to put the value.
75 */
76 nmap = 1;
77 error = xfs_bmapi_read(dp, (xfs_fileoff_t)tblkno, tblkcnt,
78 &map, &nmap, XFS_BMAPI_ATTRFORK);
79 if (error) {
80 return(error);
81 }
82 ASSERT(nmap == 1);
83 ASSERT(map.br_startblock != DELAYSTARTBLOCK);
84
85 /*
86 * If it's a hole, these are already unmapped
87 * so there's nothing to invalidate.
88 */
89 if (map.br_startblock != HOLESTARTBLOCK) {
90
91 dblkno = XFS_FSB_TO_DADDR(dp->i_mount,
92 map.br_startblock);
93 dblkcnt = XFS_FSB_TO_BB(dp->i_mount,
94 map.br_blockcount);
95 bp = xfs_trans_get_buf(*trans,
96 dp->i_mount->m_ddev_targp,
97 dblkno, dblkcnt, 0);
98 if (!bp)
99 return ENOMEM;
100 xfs_trans_binval(*trans, bp);
101 /*
102 * Roll to next transaction.
103 */
104 error = xfs_trans_roll(trans, dp);
105 if (error)
106 return (error);
107 }
108
109 tblkno += map.br_blockcount;
110 tblkcnt -= map.br_blockcount;
111 }
112
113 return(0);
114}
115
116/*
117 * Invalidate all of the "remote" value regions pointed to by a particular
118 * leaf block.
119 * Note that we must release the lock on the buffer so that we are not
120 * caught holding something that the logging code wants to flush to disk.
121 */
122STATIC int
123xfs_attr3_leaf_inactive(
124 struct xfs_trans **trans,
125 struct xfs_inode *dp,
126 struct xfs_buf *bp)
127{
128 struct xfs_attr_leafblock *leaf;
129 struct xfs_attr3_icleaf_hdr ichdr;
130 struct xfs_attr_leaf_entry *entry;
131 struct xfs_attr_leaf_name_remote *name_rmt;
132 struct xfs_attr_inactive_list *list;
133 struct xfs_attr_inactive_list *lp;
134 int error;
135 int count;
136 int size;
137 int tmp;
138 int i;
139
140 leaf = bp->b_addr;
141 xfs_attr3_leaf_hdr_from_disk(&ichdr, leaf);
142
143 /*
144 * Count the number of "remote" value extents.
145 */
146 count = 0;
147 entry = xfs_attr3_leaf_entryp(leaf);
148 for (i = 0; i < ichdr.count; entry++, i++) {
149 if (be16_to_cpu(entry->nameidx) &&
150 ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
151 name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
152 if (name_rmt->valueblk)
153 count++;
154 }
155 }
156
157 /*
158 * If there are no "remote" values, we're done.
159 */
160 if (count == 0) {
161 xfs_trans_brelse(*trans, bp);
162 return 0;
163 }
164
165 /*
166 * Allocate storage for a list of all the "remote" value extents.
167 */
168 size = count * sizeof(xfs_attr_inactive_list_t);
169 list = kmem_alloc(size, KM_SLEEP);
170
171 /*
172 * Identify each of the "remote" value extents.
173 */
174 lp = list;
175 entry = xfs_attr3_leaf_entryp(leaf);
176 for (i = 0; i < ichdr.count; entry++, i++) {
177 if (be16_to_cpu(entry->nameidx) &&
178 ((entry->flags & XFS_ATTR_LOCAL) == 0)) {
179 name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
180 if (name_rmt->valueblk) {
181 lp->valueblk = be32_to_cpu(name_rmt->valueblk);
182 lp->valuelen = xfs_attr3_rmt_blocks(dp->i_mount,
183 be32_to_cpu(name_rmt->valuelen));
184 lp++;
185 }
186 }
187 }
188 xfs_trans_brelse(*trans, bp); /* unlock for trans. in freextent() */
189
190 /*
191 * Invalidate each of the "remote" value extents.
192 */
193 error = 0;
194 for (lp = list, i = 0; i < count; i++, lp++) {
195 tmp = xfs_attr3_leaf_freextent(trans, dp,
196 lp->valueblk, lp->valuelen);
197
198 if (error == 0)
199 error = tmp; /* save only the 1st errno */
200 }
201
202 kmem_free(list);
203 return error;
204}
205
206/*
207 * Recurse (gasp!) through the attribute nodes until we find leaves.
208 * We're doing a depth-first traversal in order to invalidate everything.
209 */
210STATIC int
211xfs_attr3_node_inactive(
212 struct xfs_trans **trans,
213 struct xfs_inode *dp,
214 struct xfs_buf *bp,
215 int level)
216{
217 xfs_da_blkinfo_t *info;
218 xfs_da_intnode_t *node;
219 xfs_dablk_t child_fsb;
220 xfs_daddr_t parent_blkno, child_blkno;
221 int error, i;
222 struct xfs_buf *child_bp;
223 struct xfs_da_node_entry *btree;
224 struct xfs_da3_icnode_hdr ichdr;
225
226 /*
227 * Since this code is recursive (gasp!) we must protect ourselves.
228 */
229 if (level > XFS_DA_NODE_MAXDEPTH) {
230 xfs_trans_brelse(*trans, bp); /* no locks for later trans */
231 return XFS_ERROR(EIO);
232 }
233
234 node = bp->b_addr;
235 xfs_da3_node_hdr_from_disk(&ichdr, node);
236 parent_blkno = bp->b_bn;
237 if (!ichdr.count) {
238 xfs_trans_brelse(*trans, bp);
239 return 0;
240 }
241 btree = xfs_da3_node_tree_p(node);
242 child_fsb = be32_to_cpu(btree[0].before);
243 xfs_trans_brelse(*trans, bp); /* no locks for later trans */
244
245 /*
246 * If this is the node level just above the leaves, simply loop
247 * over the leaves removing all of them. If this is higher up
248 * in the tree, recurse downward.
249 */
250 for (i = 0; i < ichdr.count; i++) {
251 /*
252 * Read the subsidiary block to see what we have to work with.
253 * Don't do this in a transaction. This is a depth-first
254 * traversal of the tree so we may deal with many blocks
255 * before we come back to this one.
256 */
257 error = xfs_da3_node_read(*trans, dp, child_fsb, -2, &child_bp,
258 XFS_ATTR_FORK);
259 if (error)
260 return(error);
261 if (child_bp) {
262 /* save for re-read later */
263 child_blkno = XFS_BUF_ADDR(child_bp);
264
265 /*
266 * Invalidate the subtree, however we have to.
267 */
268 info = child_bp->b_addr;
269 switch (info->magic) {
270 case cpu_to_be16(XFS_DA_NODE_MAGIC):
271 case cpu_to_be16(XFS_DA3_NODE_MAGIC):
272 error = xfs_attr3_node_inactive(trans, dp,
273 child_bp, level + 1);
274 break;
275 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
276 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
277 error = xfs_attr3_leaf_inactive(trans, dp,
278 child_bp);
279 break;
280 default:
281 error = XFS_ERROR(EIO);
282 xfs_trans_brelse(*trans, child_bp);
283 break;
284 }
285 if (error)
286 return error;
287
288 /*
289 * Remove the subsidiary block from the cache
290 * and from the log.
291 */
292 error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
293 &child_bp, XFS_ATTR_FORK);
294 if (error)
295 return error;
296 xfs_trans_binval(*trans, child_bp);
297 }
298
299 /*
300 * If we're not done, re-read the parent to get the next
301 * child block number.
302 */
303 if (i + 1 < ichdr.count) {
304 error = xfs_da3_node_read(*trans, dp, 0, parent_blkno,
305 &bp, XFS_ATTR_FORK);
306 if (error)
307 return error;
308 child_fsb = be32_to_cpu(btree[i + 1].before);
309 xfs_trans_brelse(*trans, bp);
310 }
311 /*
312 * Atomically commit the whole invalidate stuff.
313 */
314 error = xfs_trans_roll(trans, dp);
315 if (error)
316 return error;
317 }
318
319 return 0;
320}
321
322/*
323 * Indiscriminately delete the entire attribute fork
324 *
325 * Recurse (gasp!) through the attribute nodes until we find leaves.
326 * We're doing a depth-first traversal in order to invalidate everything.
327 */
328int
329xfs_attr3_root_inactive(
330 struct xfs_trans **trans,
331 struct xfs_inode *dp)
332{
333 struct xfs_da_blkinfo *info;
334 struct xfs_buf *bp;
335 xfs_daddr_t blkno;
336 int error;
337
338 /*
339 * Read block 0 to see what we have to work with.
340 * We only get here if we have extents, since we remove
341 * the extents in reverse order the extent containing
342 * block 0 must still be there.
343 */
344 error = xfs_da3_node_read(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
345 if (error)
346 return error;
347 blkno = bp->b_bn;
348
349 /*
350 * Invalidate the tree, even if the "tree" is only a single leaf block.
351 * This is a depth-first traversal!
352 */
353 info = bp->b_addr;
354 switch (info->magic) {
355 case cpu_to_be16(XFS_DA_NODE_MAGIC):
356 case cpu_to_be16(XFS_DA3_NODE_MAGIC):
357 error = xfs_attr3_node_inactive(trans, dp, bp, 1);
358 break;
359 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
360 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
361 error = xfs_attr3_leaf_inactive(trans, dp, bp);
362 break;
363 default:
364 error = XFS_ERROR(EIO);
365 xfs_trans_brelse(*trans, bp);
366 break;
367 }
368 if (error)
369 return error;
370
371 /*
372 * Invalidate the incore copy of the root block.
373 */
374 error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK);
375 if (error)
376 return error;
377 xfs_trans_binval(*trans, bp); /* remove from cache */
378 /*
379 * Commit the invalidate and start the next transaction.
380 */
381 error = xfs_trans_roll(trans, dp);
382
383 return error;
384}
385
386int
387xfs_attr_inactive(xfs_inode_t *dp)
388{
389 xfs_trans_t *trans;
390 xfs_mount_t *mp;
391 int error;
392
393 mp = dp->i_mount;
394 ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
395
396 xfs_ilock(dp, XFS_ILOCK_SHARED);
397 if (!xfs_inode_hasattr(dp) ||
398 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
399 xfs_iunlock(dp, XFS_ILOCK_SHARED);
400 return 0;
401 }
402 xfs_iunlock(dp, XFS_ILOCK_SHARED);
403
404 /*
405 * Start our first transaction of the day.
406 *
407 * All future transactions during this code must be "chained" off
408 * this one via the trans_dup() call. All transactions will contain
409 * the inode, and the inode will always be marked with trans_ihold().
410 * Since the inode will be locked in all transactions, we must log
411 * the inode in every transaction to let it float upward through
412 * the log.
413 */
414 trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
415 error = xfs_trans_reserve(trans, &M_RES(mp)->tr_attrinval, 0, 0);
416 if (error) {
417 xfs_trans_cancel(trans, 0);
418 return(error);
419 }
420 xfs_ilock(dp, XFS_ILOCK_EXCL);
421
422 /*
423 * No need to make quota reservations here. We expect to release some
424 * blocks, not allocate, in the common case.
425 */
426 xfs_trans_ijoin(trans, dp, 0);
427
428 /*
429 * Decide on what work routines to call based on the inode size.
430 */
431 if (!xfs_inode_hasattr(dp) ||
432 dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
433 error = 0;
434 goto out;
435 }
436 error = xfs_attr3_root_inactive(&trans, dp);
437 if (error)
438 goto out;
439
440 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
441 if (error)
442 goto out;
443
444 error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
445 xfs_iunlock(dp, XFS_ILOCK_EXCL);
446
447 return(error);
448
449out:
450 xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
451 xfs_iunlock(dp, XFS_ILOCK_EXCL);
452 return(error);
453}
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