summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_attr_inactive.c
blob: 5db87b34fb6e2067442e50d7e586605978e27b0a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * Copyright (c) 2013 Red Hat, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_attr.h"
#include "xfs_attr_remote.h"
#include "xfs_trans.h"
#include "xfs_bmap.h"
#include "xfs_attr_leaf.h"
#include "xfs_quota.h"
#include "xfs_dir2.h"
#include "xfs_error.h"

/*
 * Invalidate any incore buffers associated with this remote attribute value
 * extent.   We never log remote attribute value buffers, which means that they
 * won't be attached to a transaction and are therefore safe to mark stale.
 * The actual bunmapi will be taken care of later.
 */
STATIC int
xfs_attr3_rmt_stale(
	struct xfs_inode	*dp,
	xfs_dablk_t		blkno,
	int			blkcnt)
{
	struct xfs_bmbt_irec	map;
	int			nmap;
	int			error;

	/*
	 * Roll through the "value", invalidating the attribute value's
	 * blocks.
	 */
	while (blkcnt > 0) {
		/*
		 * Try to remember where we decided to put the value.
		 */
		nmap = 1;
		error = xfs_bmapi_read(dp, (xfs_fileoff_t)blkno, blkcnt,
				       &map, &nmap, XFS_BMAPI_ATTRFORK);
		if (error)
			return error;
		if (XFS_IS_CORRUPT(dp->i_mount, nmap != 1))
			return -EFSCORRUPTED;

		/*
		 * Mark any incore buffers for the remote value as stale.  We
		 * never log remote attr value buffers, so the buffer should be
		 * easy to kill.
		 */
		error = xfs_attr_rmtval_stale(dp, &map, 0);
		if (error)
			return error;

		blkno += map.br_blockcount;
		blkcnt -= map.br_blockcount;
	}

	return 0;
}

/*
 * Invalidate all of the "remote" value regions pointed to by a particular
 * leaf block.
 * Note that we must release the lock on the buffer so that we are not
 * caught holding something that the logging code wants to flush to disk.
 */
STATIC int
xfs_attr3_leaf_inactive(
	struct xfs_trans		**trans,
	struct xfs_inode		*dp,
	struct xfs_buf			*bp)
{
	struct xfs_attr3_icleaf_hdr	ichdr;
	struct xfs_mount		*mp = bp->b_mount;
	struct xfs_attr_leafblock	*leaf = bp->b_addr;
	struct xfs_attr_leaf_entry	*entry;
	struct xfs_attr_leaf_name_remote *name_rmt;
	int				error = 0;
	int				i;

	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);

	/*
	 * Find the remote value extents for this leaf and invalidate their
	 * incore buffers.
	 */
	entry = xfs_attr3_leaf_entryp(leaf);
	for (i = 0; i < ichdr.count; entry++, i++) {
		int		blkcnt;

		if (!entry->nameidx || (entry->flags & XFS_ATTR_LOCAL))
			continue;

		name_rmt = xfs_attr3_leaf_name_remote(leaf, i);
		if (!name_rmt->valueblk)
			continue;

		blkcnt = xfs_attr3_rmt_blocks(dp->i_mount,
				be32_to_cpu(name_rmt->valuelen));
		error = xfs_attr3_rmt_stale(dp,
				be32_to_cpu(name_rmt->valueblk), blkcnt);
		if (error)
			goto err;
	}

	xfs_trans_brelse(*trans, bp);
err:
	return error;
}

/*
 * Recurse (gasp!) through the attribute nodes until we find leaves.
 * We're doing a depth-first traversal in order to invalidate everything.
 */
STATIC int
xfs_attr3_node_inactive(
	struct xfs_trans	**trans,
	struct xfs_inode	*dp,
	struct xfs_buf		*bp,
	int			level)
{
	struct xfs_mount	*mp = dp->i_mount;
	struct xfs_da_blkinfo	*info;
	xfs_dablk_t		child_fsb;
	xfs_daddr_t		parent_blkno, child_blkno;
	struct xfs_buf		*child_bp;
	struct xfs_da3_icnode_hdr ichdr;
	int			error, i;

	/*
	 * Since this code is recursive (gasp!) we must protect ourselves.
	 */
	if (level > XFS_DA_NODE_MAXDEPTH) {
		xfs_buf_mark_corrupt(bp);
		xfs_trans_brelse(*trans, bp);	/* no locks for later trans */
		return -EFSCORRUPTED;
	}

	xfs_da3_node_hdr_from_disk(dp->i_mount, &ichdr, bp->b_addr);
	parent_blkno = xfs_buf_daddr(bp);
	if (!ichdr.count) {
		xfs_trans_brelse(*trans, bp);
		return 0;
	}
	child_fsb = be32_to_cpu(ichdr.btree[0].before);
	xfs_trans_brelse(*trans, bp);	/* no locks for later trans */
	bp = NULL;

	/*
	 * If this is the node level just above the leaves, simply loop
	 * over the leaves removing all of them.  If this is higher up
	 * in the tree, recurse downward.
	 */
	for (i = 0; i < ichdr.count; i++) {
		/*
		 * Read the subsidiary block to see what we have to work with.
		 * Don't do this in a transaction.  This is a depth-first
		 * traversal of the tree so we may deal with many blocks
		 * before we come back to this one.
		 */
		error = xfs_da3_node_read(*trans, dp, child_fsb, &child_bp,
					  XFS_ATTR_FORK);
		if (error)
			return error;

		/* save for re-read later */
		child_blkno = xfs_buf_daddr(child_bp);

		/*
		 * Invalidate the subtree, however we have to.
		 */
		info = child_bp->b_addr;
		switch (info->magic) {
		case cpu_to_be16(XFS_DA_NODE_MAGIC):
		case cpu_to_be16(XFS_DA3_NODE_MAGIC):
			error = xfs_attr3_node_inactive(trans, dp, child_bp,
							level + 1);
			break;
		case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
		case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
			error = xfs_attr3_leaf_inactive(trans, dp, child_bp);
			break;
		default:
			xfs_buf_mark_corrupt(child_bp);
			xfs_trans_brelse(*trans, child_bp);
			error = -EFSCORRUPTED;
			break;
		}
		if (error)
			return error;

		/*
		 * Remove the subsidiary block from the cache and from the log.
		 */
		error = xfs_trans_get_buf(*trans, mp->m_ddev_targp,
				child_blkno,
				XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0,
				&child_bp);
		if (error)
			return error;
		xfs_trans_binval(*trans, child_bp);
		child_bp = NULL;

		/*
		 * If we're not done, re-read the parent to get the next
		 * child block number.
		 */
		if (i + 1 < ichdr.count) {
			struct xfs_da3_icnode_hdr phdr;

			error = xfs_da3_node_read_mapped(*trans, dp,
					parent_blkno, &bp, XFS_ATTR_FORK);
			if (error)
				return error;
			xfs_da3_node_hdr_from_disk(dp->i_mount, &phdr,
						  bp->b_addr);
			child_fsb = be32_to_cpu(phdr.btree[i + 1].before);
			xfs_trans_brelse(*trans, bp);
			bp = NULL;
		}
		/*
		 * Atomically commit the whole invalidate stuff.
		 */
		error = xfs_trans_roll_inode(trans, dp);
		if (error)
			return  error;
	}

	return 0;
}

/*
 * Indiscriminately delete the entire attribute fork
 *
 * Recurse (gasp!) through the attribute nodes until we find leaves.
 * We're doing a depth-first traversal in order to invalidate everything.
 */
static int
xfs_attr3_root_inactive(
	struct xfs_trans	**trans,
	struct xfs_inode	*dp)
{
	struct xfs_mount	*mp = dp->i_mount;
	struct xfs_da_blkinfo	*info;
	struct xfs_buf		*bp;
	xfs_daddr_t		blkno;
	int			error;

	/*
	 * Read block 0 to see what we have to work with.
	 * We only get here if we have extents, since we remove
	 * the extents in reverse order the extent containing
	 * block 0 must still be there.
	 */
	error = xfs_da3_node_read(*trans, dp, 0, &bp, XFS_ATTR_FORK);
	if (error)
		return error;
	blkno = xfs_buf_daddr(bp);

	/*
	 * Invalidate the tree, even if the "tree" is only a single leaf block.
	 * This is a depth-first traversal!
	 */
	info = bp->b_addr;
	switch (info->magic) {
	case cpu_to_be16(XFS_DA_NODE_MAGIC):
	case cpu_to_be16(XFS_DA3_NODE_MAGIC):
		error = xfs_attr3_node_inactive(trans, dp, bp, 1);
		break;
	case cpu_to_be16(XFS_ATTR_LEAF_MAGIC):
	case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC):
		error = xfs_attr3_leaf_inactive(trans, dp, bp);
		break;
	default:
		error = -EFSCORRUPTED;
		xfs_buf_mark_corrupt(bp);
		xfs_trans_brelse(*trans, bp);
		break;
	}
	if (error)
		return error;

	/*
	 * Invalidate the incore copy of the root block.
	 */
	error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, blkno,
			XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, &bp);
	if (error)
		return error;
	error = bp->b_error;
	if (error) {
		xfs_trans_brelse(*trans, bp);
		return error;
	}
	xfs_trans_binval(*trans, bp);	/* remove from cache */
	/*
	 * Commit the invalidate and start the next transaction.
	 */
	error = xfs_trans_roll_inode(trans, dp);

	return error;
}

/*
 * xfs_attr_inactive kills all traces of an attribute fork on an inode. It
 * removes both the on-disk and in-memory inode fork. Note that this also has to
 * handle the condition of inodes without attributes but with an attribute fork
 * configured, so we can't use xfs_inode_hasattr() here.
 *
 * The in-memory attribute fork is removed even on error.
 */
int
xfs_attr_inactive(
	struct xfs_inode	*dp)
{
	struct xfs_trans	*trans;
	struct xfs_mount	*mp;
	int			lock_mode = XFS_ILOCK_SHARED;
	int			error = 0;

	mp = dp->i_mount;
	ASSERT(! XFS_NOT_DQATTACHED(mp, dp));

	xfs_ilock(dp, lock_mode);
	if (!xfs_inode_has_attr_fork(dp))
		goto out_destroy_fork;
	xfs_iunlock(dp, lock_mode);

	lock_mode = 0;

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans);
	if (error)
		goto out_destroy_fork;

	lock_mode = XFS_ILOCK_EXCL;
	xfs_ilock(dp, lock_mode);

	if (!xfs_inode_has_attr_fork(dp))
		goto out_cancel;

	/*
	 * No need to make quota reservations here. We expect to release some
	 * blocks, not allocate, in the common case.
	 */
	xfs_trans_ijoin(trans, dp, 0);

	/*
	 * Invalidate and truncate the attribute fork extents. Make sure the
	 * fork actually has xattr blocks as otherwise the invalidation has no
	 * blocks to read and returns an error. In this case, just do the fork
	 * removal below.
	 */
	if (dp->i_af.if_nextents > 0) {
		error = xfs_attr3_root_inactive(&trans, dp);
		if (error)
			goto out_cancel;

		error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
		if (error)
			goto out_cancel;
	}

	/* Reset the attribute fork - this also destroys the in-core fork */
	xfs_attr_fork_remove(dp, trans);

	error = xfs_trans_commit(trans);
	xfs_iunlock(dp, lock_mode);
	return error;

out_cancel:
	xfs_trans_cancel(trans);
out_destroy_fork:
	/* kill the in-core attr fork before we drop the inode lock */
	xfs_ifork_zap_attr(dp);
	if (lock_mode)
		xfs_iunlock(dp, lock_mode);
	return error;
}