rgrp.c 40.4 KB
Newer Older
David Teigland's avatar
David Teigland committed
1
2
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3
 * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
David Teigland's avatar
David Teigland committed
4
5
6
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
7
 * of the GNU General Public License version 2.
David Teigland's avatar
David Teigland committed
8
9
10
11
12
13
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
14
#include <linux/fs.h>
15
#include <linux/gfs2_ondisk.h>
16
#include <linux/lm_interface.h>
David Teigland's avatar
David Teigland committed
17
18

#include "gfs2.h"
19
#include "incore.h"
David Teigland's avatar
David Teigland committed
20
21
22
23
24
25
26
27
#include "glock.h"
#include "glops.h"
#include "lops.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
28
#include "ops_file.h"
29
#include "util.h"
30
#include "log.h"
31
#include "inode.h"
David Teigland's avatar
David Teigland committed
32

Steven Whitehouse's avatar
Steven Whitehouse committed
33
#define BFITNOENT ((u32)~0)
34
35
36
37

/*
 * These routines are used by the resource group routines (rgrp.c)
 * to keep track of block allocation.  Each block is represented by two
38
39
40
41
42
43
 * bits.  So, each byte represents GFS2_NBBY (i.e. 4) blocks.
 *
 * 0 = Free
 * 1 = Used (not metadata)
 * 2 = Unlinked (still in use) inode
 * 3 = Used (metadata)
44
45
46
47
 */

static const char valid_change[16] = {
	        /* current */
48
	/* n */ 0, 1, 1, 1,
49
	/* e */ 1, 0, 0, 0,
50
	/* w */ 0, 0, 0, 1,
51
52
53
	        1, 0, 0, 0
};

54
55
56
static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
                        unsigned char old_state, unsigned char new_state);

57
58
59
60
61
62
63
64
65
/**
 * gfs2_setbit - Set a bit in the bitmaps
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @block: the block to set
 * @new_state: the new state of the block
 *
 */

66
static void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
67
			unsigned int buflen, u32 block,
68
			unsigned char new_state)
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
{
	unsigned char *byte, *end, cur_state;
	unsigned int bit;

	byte = buffer + (block / GFS2_NBBY);
	bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
	end = buffer + buflen;

	gfs2_assert(rgd->rd_sbd, byte < end);

	cur_state = (*byte >> bit) & GFS2_BIT_MASK;

	if (valid_change[new_state * 4 + cur_state]) {
		*byte ^= cur_state << bit;
		*byte |= new_state << bit;
	} else
		gfs2_consist_rgrpd(rgd);
}

/**
 * gfs2_testbit - test a bit in the bitmaps
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @block: the block to read
 *
 */

96
static unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
97
				  unsigned int buflen, u32 block)
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
{
	unsigned char *byte, *end, cur_state;
	unsigned int bit;

	byte = buffer + (block / GFS2_NBBY);
	bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
	end = buffer + buflen;

	gfs2_assert(rgd->rd_sbd, byte < end);

	cur_state = (*byte >> bit) & GFS2_BIT_MASK;

	return cur_state;
}

/**
 * gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
 *       a block in a given allocation state.
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @goal: start search at this block's bit-pair (within @buffer)
 * @old_state: GFS2_BLKST_XXX the state of the block we're looking for;
 *       bit 0 = alloc(1)/free(0), bit 1 = meta(1)/data(0)
 *
 * Scope of @goal and returned block number is only within this bitmap buffer,
 * not entire rgrp or filesystem.  @buffer will be offset from the actual
 * beginning of a bitmap block buffer, skipping any header structures.
 *
 * Return: the block number (bitmap buffer scope) that was found
 */

129
130
static u32 gfs2_bitfit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
			    unsigned int buflen, u32 goal,
131
			    unsigned char old_state)
132
133
{
	unsigned char *byte, *end, alloc;
134
	u32 blk = goal;
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
	unsigned int bit;

	byte = buffer + (goal / GFS2_NBBY);
	bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;
	end = buffer + buflen;
	alloc = (old_state & 1) ? 0 : 0x55;

	while (byte < end) {
		if ((*byte & 0x55) == alloc) {
			blk += (8 - bit) >> 1;

			bit = 0;
			byte++;

			continue;
		}

		if (((*byte >> bit) & GFS2_BIT_MASK) == old_state)
			return blk;

		bit += GFS2_BIT_SIZE;
		if (bit >= 8) {
			bit = 0;
			byte++;
		}

		blk++;
	}

	return BFITNOENT;
}

/**
 * gfs2_bitcount - count the number of bits in a certain state
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @state: the state of the block we're looking for
 *
 * Returns: The number of bits
 */

176
static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, unsigned char *buffer,
177
			      unsigned int buflen, unsigned char state)
178
179
180
181
182
183
{
	unsigned char *byte = buffer;
	unsigned char *end = buffer + buflen;
	unsigned char state1 = state << 2;
	unsigned char state2 = state << 4;
	unsigned char state3 = state << 6;
184
	u32 count = 0;
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199

	for (; byte < end; byte++) {
		if (((*byte) & 0x03) == state)
			count++;
		if (((*byte) & 0x0C) == state1)
			count++;
		if (((*byte) & 0x30) == state2)
			count++;
		if (((*byte) & 0xC0) == state3)
			count++;
	}

	return count;
}

David Teigland's avatar
David Teigland committed
200
201
202
203
204
205
206
207
208
209
210
/**
 * gfs2_rgrp_verify - Verify that a resource group is consistent
 * @sdp: the filesystem
 * @rgd: the rgrp
 *
 */

void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	struct gfs2_bitmap *bi = NULL;
211
	u32 length = rgd->rd_length;
212
	u32 count[4], tmp;
David Teigland's avatar
David Teigland committed
213
214
	int buf, x;

215
	memset(count, 0, 4 * sizeof(u32));
David Teigland's avatar
David Teigland committed
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233

	/* Count # blocks in each of 4 possible allocation states */
	for (buf = 0; buf < length; buf++) {
		bi = rgd->rd_bits + buf;
		for (x = 0; x < 4; x++)
			count[x] += gfs2_bitcount(rgd,
						  bi->bi_bh->b_data +
						  bi->bi_offset,
						  bi->bi_len, x);
	}

	if (count[0] != rgd->rd_rg.rg_free) {
		if (gfs2_consist_rgrpd(rgd))
			fs_err(sdp, "free data mismatch:  %u != %u\n",
			       count[0], rgd->rd_rg.rg_free);
		return;
	}

234
	tmp = rgd->rd_data -
David Teigland's avatar
David Teigland committed
235
236
		rgd->rd_rg.rg_free -
		rgd->rd_rg.rg_dinodes;
237
	if (count[1] + count[2] != tmp) {
David Teigland's avatar
David Teigland committed
238
239
240
241
242
243
		if (gfs2_consist_rgrpd(rgd))
			fs_err(sdp, "used data mismatch:  %u != %u\n",
			       count[1], tmp);
		return;
	}

244
	if (count[3] != rgd->rd_rg.rg_dinodes) {
David Teigland's avatar
David Teigland committed
245
		if (gfs2_consist_rgrpd(rgd))
246
247
			fs_err(sdp, "used metadata mismatch:  %u != %u\n",
			       count[3], rgd->rd_rg.rg_dinodes);
David Teigland's avatar
David Teigland committed
248
249
250
		return;
	}

251
	if (count[2] > count[3]) {
David Teigland's avatar
David Teigland committed
252
		if (gfs2_consist_rgrpd(rgd))
253
254
			fs_err(sdp, "unlinked inodes > inodes:  %u\n",
			       count[2]);
David Teigland's avatar
David Teigland committed
255
256
		return;
	}
257

David Teigland's avatar
David Teigland committed
258
259
}

260
static inline int rgrp_contains_block(struct gfs2_rgrpd *rgd, u64 block)
David Teigland's avatar
David Teigland committed
261
{
262
263
	u64 first = rgd->rd_data0;
	u64 last = first + rgd->rd_data;
264
	return first <= block && block < last;
David Teigland's avatar
David Teigland committed
265
266
267
268
269
270
271
272
273
274
}

/**
 * gfs2_blk2rgrpd - Find resource group for a given data/meta block number
 * @sdp: The GFS2 superblock
 * @n: The data block number
 *
 * Returns: The resource group, or NULL if not found
 */

275
struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk)
David Teigland's avatar
David Teigland committed
276
277
278
279
280
281
{
	struct gfs2_rgrpd *rgd;

	spin_lock(&sdp->sd_rindex_spin);

	list_for_each_entry(rgd, &sdp->sd_rindex_mru_list, rd_list_mru) {
282
		if (rgrp_contains_block(rgd, blk)) {
David Teigland's avatar
David Teigland committed
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
			list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
			spin_unlock(&sdp->sd_rindex_spin);
			return rgd;
		}
	}

	spin_unlock(&sdp->sd_rindex_spin);

	return NULL;
}

/**
 * gfs2_rgrpd_get_first - get the first Resource Group in the filesystem
 * @sdp: The GFS2 superblock
 *
 * Returns: The first rgrp in the filesystem
 */

struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp)
{
	gfs2_assert(sdp, !list_empty(&sdp->sd_rindex_list));
	return list_entry(sdp->sd_rindex_list.next, struct gfs2_rgrpd, rd_list);
}

/**
 * gfs2_rgrpd_get_next - get the next RG
 * @rgd: A RG
 *
 * Returns: The next rgrp
 */

struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
{
	if (rgd->rd_list.next == &rgd->rd_sbd->sd_rindex_list)
		return NULL;
	return list_entry(rgd->rd_list.next, struct gfs2_rgrpd, rd_list);
}

static void clear_rgrpdi(struct gfs2_sbd *sdp)
{
	struct list_head *head;
	struct gfs2_rgrpd *rgd;
	struct gfs2_glock *gl;

	spin_lock(&sdp->sd_rindex_spin);
	sdp->sd_rindex_forward = NULL;
	head = &sdp->sd_rindex_recent_list;
	while (!list_empty(head)) {
		rgd = list_entry(head->next, struct gfs2_rgrpd, rd_recent);
		list_del(&rgd->rd_recent);
	}
	spin_unlock(&sdp->sd_rindex_spin);

	head = &sdp->sd_rindex_list;
	while (!list_empty(head)) {
		rgd = list_entry(head->next, struct gfs2_rgrpd, rd_list);
		gl = rgd->rd_gl;

		list_del(&rgd->rd_list);
		list_del(&rgd->rd_list_mru);

		if (gl) {
345
			gl->gl_object = NULL;
David Teigland's avatar
David Teigland committed
346
347
348
349
350
351
352
353
354
355
			gfs2_glock_put(gl);
		}

		kfree(rgd->rd_bits);
		kfree(rgd);
	}
}

void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
{
356
	mutex_lock(&sdp->sd_rindex_mutex);
David Teigland's avatar
David Teigland committed
357
	clear_rgrpdi(sdp);
358
	mutex_unlock(&sdp->sd_rindex_mutex);
David Teigland's avatar
David Teigland committed
359
360
}

361
362
363
364
365
366
367
368
369
static void gfs2_rindex_print(const struct gfs2_rgrpd *rgd)
{
	printk(KERN_INFO "  ri_addr = %llu\n", (unsigned long long)rgd->rd_addr);
	printk(KERN_INFO "  ri_length = %u\n", rgd->rd_length);
	printk(KERN_INFO "  ri_data0 = %llu\n", (unsigned long long)rgd->rd_data0);
	printk(KERN_INFO "  ri_data = %u\n", rgd->rd_data);
	printk(KERN_INFO "  ri_bitbytes = %u\n", rgd->rd_bitbytes);
}

David Teigland's avatar
David Teigland committed
370
371
372
373
374
375
376
377
378
379
380
381
382
/**
 * gfs2_compute_bitstructs - Compute the bitmap sizes
 * @rgd: The resource group descriptor
 *
 * Calculates bitmap descriptors, one for each block that contains bitmap data
 *
 * Returns: errno
 */

static int compute_bitstructs(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	struct gfs2_bitmap *bi;
383
	u32 length = rgd->rd_length; /* # blocks in hdr & bitmap */
384
	u32 bytes_left, bytes;
David Teigland's avatar
David Teigland committed
385
386
	int x;

387
388
389
	if (!length)
		return -EINVAL;

390
	rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap), GFP_NOFS);
David Teigland's avatar
David Teigland committed
391
392
393
	if (!rgd->rd_bits)
		return -ENOMEM;

394
	bytes_left = rgd->rd_bitbytes;
David Teigland's avatar
David Teigland committed
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414

	for (x = 0; x < length; x++) {
		bi = rgd->rd_bits + x;

		/* small rgrp; bitmap stored completely in header block */
		if (length == 1) {
			bytes = bytes_left;
			bi->bi_offset = sizeof(struct gfs2_rgrp);
			bi->bi_start = 0;
			bi->bi_len = bytes;
		/* header block */
		} else if (x == 0) {
			bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
			bi->bi_offset = sizeof(struct gfs2_rgrp);
			bi->bi_start = 0;
			bi->bi_len = bytes;
		/* last block */
		} else if (x + 1 == length) {
			bytes = bytes_left;
			bi->bi_offset = sizeof(struct gfs2_meta_header);
415
			bi->bi_start = rgd->rd_bitbytes - bytes_left;
David Teigland's avatar
David Teigland committed
416
417
418
			bi->bi_len = bytes;
		/* other blocks */
		} else {
419
420
			bytes = sdp->sd_sb.sb_bsize -
				sizeof(struct gfs2_meta_header);
David Teigland's avatar
David Teigland committed
421
			bi->bi_offset = sizeof(struct gfs2_meta_header);
422
			bi->bi_start = rgd->rd_bitbytes - bytes_left;
David Teigland's avatar
David Teigland committed
423
424
425
426
427
428
429
430
431
432
433
			bi->bi_len = bytes;
		}

		bytes_left -= bytes;
	}

	if (bytes_left) {
		gfs2_consist_rgrpd(rgd);
		return -EIO;
	}
	bi = rgd->rd_bits + (length - 1);
434
	if ((bi->bi_start + bi->bi_len) * GFS2_NBBY != rgd->rd_data) {
David Teigland's avatar
David Teigland committed
435
		if (gfs2_consist_rgrpd(rgd)) {
436
			gfs2_rindex_print(rgd);
David Teigland's avatar
David Teigland committed
437
438
439
440
441
442
443
444
445
			fs_err(sdp, "start=%u len=%u offset=%u\n",
			       bi->bi_start, bi->bi_len, bi->bi_offset);
		}
		return -EIO;
	}

	return 0;
}

446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
/**
 * gfs2_ri_total - Total up the file system space, according to the rindex.
 *
 */
u64 gfs2_ri_total(struct gfs2_sbd *sdp)
{
	u64 total_data = 0;	
	struct inode *inode = sdp->sd_rindex;
	struct gfs2_inode *ip = GFS2_I(inode);
	char buf[sizeof(struct gfs2_rindex)];
	struct file_ra_state ra_state;
	int error, rgrps;

	mutex_lock(&sdp->sd_rindex_mutex);
	file_ra_state_init(&ra_state, inode->i_mapping);
	for (rgrps = 0;; rgrps++) {
		loff_t pos = rgrps * sizeof(struct gfs2_rindex);

		if (pos + sizeof(struct gfs2_rindex) >= ip->i_di.di_size)
			break;
		error = gfs2_internal_read(ip, &ra_state, buf, &pos,
					   sizeof(struct gfs2_rindex));
		if (error != sizeof(struct gfs2_rindex))
			break;
470
		total_data += be32_to_cpu(((struct gfs2_rindex *)buf)->ri_data);
471
472
473
474
475
	}
	mutex_unlock(&sdp->sd_rindex_mutex);
	return total_data;
}

476
477
478
479
480
481
482
483
484
485
486
static void gfs2_rindex_in(struct gfs2_rgrpd *rgd, const void *buf)
{
	const struct gfs2_rindex *str = buf;

	rgd->rd_addr = be64_to_cpu(str->ri_addr);
	rgd->rd_length = be32_to_cpu(str->ri_length);
	rgd->rd_data0 = be64_to_cpu(str->ri_data0);
	rgd->rd_data = be32_to_cpu(str->ri_data);
	rgd->rd_bitbytes = be32_to_cpu(str->ri_bitbytes);
}

David Teigland's avatar
David Teigland committed
487
/**
488
 * read_rindex_entry - Pull in a new resource index entry from the disk
David Teigland's avatar
David Teigland committed
489
490
 * @gl: The glock covering the rindex inode
 *
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
 * Returns: 0 on success, error code otherwise
 */

static int read_rindex_entry(struct gfs2_inode *ip,
			     struct file_ra_state *ra_state)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
	char buf[sizeof(struct gfs2_rindex)];
	int error;
	struct gfs2_rgrpd *rgd;

	error = gfs2_internal_read(ip, ra_state, buf, &pos,
				   sizeof(struct gfs2_rindex));
	if (!error)
		return 0;
	if (error != sizeof(struct gfs2_rindex)) {
		if (error > 0)
			error = -EIO;
		return error;
	}

	rgd = kzalloc(sizeof(struct gfs2_rgrpd), GFP_NOFS);
	error = -ENOMEM;
	if (!rgd)
		return error;

	mutex_init(&rgd->rd_mutex);
	lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
	rgd->rd_sbd = sdp;

	list_add_tail(&rgd->rd_list, &sdp->sd_rindex_list);
	list_add_tail(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);

525
	gfs2_rindex_in(rgd, buf);
526
527
528
529
	error = compute_bitstructs(rgd);
	if (error)
		return error;

530
	error = gfs2_glock_get(sdp, rgd->rd_addr,
531
532
533
534
535
536
			       &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
	if (error)
		return error;

	rgd->rd_gl->gl_object = rgd;
	rgd->rd_rg_vn = rgd->rd_gl->gl_vn - 1;
537
	rgd->rd_flags |= GFS2_RDF_CHECK;
538
539
540
541
542
543
544
	return error;
}

/**
 * gfs2_ri_update - Pull in a new resource index from the disk
 * @ip: pointer to the rindex inode
 *
David Teigland's avatar
David Teigland committed
545
546
547
548
549
 * Returns: 0 on successful update, error code otherwise
 */

static int gfs2_ri_update(struct gfs2_inode *ip)
{
550
551
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct inode *inode = &ip->i_inode;
552
	struct file_ra_state ra_state;
553
	u64 rgrp_count = ip->i_di.di_size;
David Teigland's avatar
David Teigland committed
554
555
	int error;

556
	if (do_div(rgrp_count, sizeof(struct gfs2_rindex))) {
David Teigland's avatar
David Teigland committed
557
558
559
560
561
562
		gfs2_consist_inode(ip);
		return -EIO;
	}

	clear_rgrpdi(sdp);

563
	file_ra_state_init(&ra_state, inode->i_mapping);
564
	for (sdp->sd_rgrps = 0; sdp->sd_rgrps < rgrp_count; sdp->sd_rgrps++) {
565
566
567
568
		error = read_rindex_entry(ip, &ra_state);
		if (error) {
			clear_rgrpdi(sdp);
			return error;
David Teigland's avatar
David Teigland committed
569
		}
570
	}
David Teigland's avatar
David Teigland committed
571

572
573
574
	sdp->sd_rindex_vn = ip->i_gl->gl_vn;
	return 0;
}
David Teigland's avatar
David Teigland committed
575

576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
/**
 * gfs2_ri_update_special - Pull in a new resource index from the disk
 *
 * This is a special version that's safe to call from gfs2_inplace_reserve_i.
 * In this case we know that we don't have any resource groups in memory yet.
 *
 * @ip: pointer to the rindex inode
 *
 * Returns: 0 on successful update, error code otherwise
 */
static int gfs2_ri_update_special(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct inode *inode = &ip->i_inode;
	struct file_ra_state ra_state;
	int error;
David Teigland's avatar
David Teigland committed
592

593
594
595
596
597
598
599
600
601
602
603
	file_ra_state_init(&ra_state, inode->i_mapping);
	for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
		/* Ignore partials */
		if ((sdp->sd_rgrps + 1) * sizeof(struct gfs2_rindex) >
		    ip->i_di.di_size)
			break;
		error = read_rindex_entry(ip, &ra_state);
		if (error) {
			clear_rgrpdi(sdp);
			return error;
		}
David Teigland's avatar
David Teigland committed
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
	}

	sdp->sd_rindex_vn = ip->i_gl->gl_vn;
	return 0;
}

/**
 * gfs2_rindex_hold - Grab a lock on the rindex
 * @sdp: The GFS2 superblock
 * @ri_gh: the glock holder
 *
 * We grab a lock on the rindex inode to make sure that it doesn't
 * change whilst we are performing an operation. We keep this lock
 * for quite long periods of time compared to other locks. This
 * doesn't matter, since it is shared and it is very, very rarely
 * accessed in the exclusive mode (i.e. only when expanding the filesystem).
 *
 * This makes sure that we're using the latest copy of the resource index
 * special file, which might have been updated if someone expanded the
 * filesystem (via gfs2_grow utility), which adds new resource groups.
 *
 * Returns: 0 on success, error code otherwise
 */

int gfs2_rindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ri_gh)
{
630
	struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
David Teigland's avatar
David Teigland committed
631
632
633
634
635
636
637
638
639
	struct gfs2_glock *gl = ip->i_gl;
	int error;

	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, ri_gh);
	if (error)
		return error;

	/* Read new copy from disk if we don't have the latest */
	if (sdp->sd_rindex_vn != gl->gl_vn) {
640
		mutex_lock(&sdp->sd_rindex_mutex);
David Teigland's avatar
David Teigland committed
641
642
643
644
645
		if (sdp->sd_rindex_vn != gl->gl_vn) {
			error = gfs2_ri_update(ip);
			if (error)
				gfs2_glock_dq_uninit(ri_gh);
		}
646
		mutex_unlock(&sdp->sd_rindex_mutex);
David Teigland's avatar
David Teigland committed
647
648
649
650
651
	}

	return error;
}

652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
static void gfs2_rgrp_in(struct gfs2_rgrp_host *rg, const void *buf)
{
	const struct gfs2_rgrp *str = buf;

	rg->rg_flags = be32_to_cpu(str->rg_flags);
	rg->rg_free = be32_to_cpu(str->rg_free);
	rg->rg_dinodes = be32_to_cpu(str->rg_dinodes);
	rg->rg_igeneration = be64_to_cpu(str->rg_igeneration);
}

static void gfs2_rgrp_out(const struct gfs2_rgrp_host *rg, void *buf)
{
	struct gfs2_rgrp *str = buf;

	str->rg_flags = cpu_to_be32(rg->rg_flags);
	str->rg_free = cpu_to_be32(rg->rg_free);
	str->rg_dinodes = cpu_to_be32(rg->rg_dinodes);
	str->__pad = cpu_to_be32(0);
	str->rg_igeneration = cpu_to_be64(rg->rg_igeneration);
	memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
}

David Teigland's avatar
David Teigland committed
674
675
676
677
678
679
680
681
682
683
684
685
686
687
/**
 * gfs2_rgrp_bh_get - Read in a RG's header and bitmaps
 * @rgd: the struct gfs2_rgrpd describing the RG to read in
 *
 * Read in all of a Resource Group's header and bitmap blocks.
 * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
 *
 * Returns: errno
 */

int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	struct gfs2_glock *gl = rgd->rd_gl;
688
	unsigned int length = rgd->rd_length;
David Teigland's avatar
David Teigland committed
689
690
691
692
	struct gfs2_bitmap *bi;
	unsigned int x, y;
	int error;

693
	mutex_lock(&rgd->rd_mutex);
David Teigland's avatar
David Teigland committed
694
695
696
697
698

	spin_lock(&sdp->sd_rindex_spin);
	if (rgd->rd_bh_count) {
		rgd->rd_bh_count++;
		spin_unlock(&sdp->sd_rindex_spin);
699
		mutex_unlock(&rgd->rd_mutex);
David Teigland's avatar
David Teigland committed
700
701
702
703
704
705
		return 0;
	}
	spin_unlock(&sdp->sd_rindex_spin);

	for (x = 0; x < length; x++) {
		bi = rgd->rd_bits + x;
706
		error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh);
David Teigland's avatar
David Teigland committed
707
708
709
710
711
712
		if (error)
			goto fail;
	}

	for (y = length; y--;) {
		bi = rgd->rd_bits + y;
713
		error = gfs2_meta_wait(sdp, bi->bi_bh);
David Teigland's avatar
David Teigland committed
714
715
		if (error)
			goto fail;
716
		if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
David Teigland's avatar
David Teigland committed
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
					      GFS2_METATYPE_RG)) {
			error = -EIO;
			goto fail;
		}
	}

	if (rgd->rd_rg_vn != gl->gl_vn) {
		gfs2_rgrp_in(&rgd->rd_rg, (rgd->rd_bits[0].bi_bh)->b_data);
		rgd->rd_rg_vn = gl->gl_vn;
	}

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone = rgd->rd_rg.rg_free;
	rgd->rd_bh_count++;
	spin_unlock(&sdp->sd_rindex_spin);

733
	mutex_unlock(&rgd->rd_mutex);
David Teigland's avatar
David Teigland committed
734
735
736

	return 0;

737
fail:
David Teigland's avatar
David Teigland committed
738
739
740
741
742
743
	while (x--) {
		bi = rgd->rd_bits + x;
		brelse(bi->bi_bh);
		bi->bi_bh = NULL;
		gfs2_assert_warn(sdp, !bi->bi_clone);
	}
744
	mutex_unlock(&rgd->rd_mutex);
David Teigland's avatar
David Teigland committed
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767

	return error;
}

void gfs2_rgrp_bh_hold(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;

	spin_lock(&sdp->sd_rindex_spin);
	gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
	rgd->rd_bh_count++;
	spin_unlock(&sdp->sd_rindex_spin);
}

/**
 * gfs2_rgrp_bh_put - Release RG bitmaps read in with gfs2_rgrp_bh_get()
 * @rgd: the struct gfs2_rgrpd describing the RG to read in
 *
 */

void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
768
	int x, length = rgd->rd_length;
David Teigland's avatar
David Teigland committed
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790

	spin_lock(&sdp->sd_rindex_spin);
	gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
	if (--rgd->rd_bh_count) {
		spin_unlock(&sdp->sd_rindex_spin);
		return;
	}

	for (x = 0; x < length; x++) {
		struct gfs2_bitmap *bi = rgd->rd_bits + x;
		kfree(bi->bi_clone);
		bi->bi_clone = NULL;
		brelse(bi->bi_bh);
		bi->bi_bh = NULL;
	}

	spin_unlock(&sdp->sd_rindex_spin);
}

void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
791
	unsigned int length = rgd->rd_length;
David Teigland's avatar
David Teigland committed
792
793
794
795
796
797
798
	unsigned int x;

	for (x = 0; x < length; x++) {
		struct gfs2_bitmap *bi = rgd->rd_bits + x;
		if (!bi->bi_clone)
			continue;
		memcpy(bi->bi_clone + bi->bi_offset,
799
		       bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
David Teigland's avatar
David Teigland committed
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
	}

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone = rgd->rd_rg.rg_free;
	spin_unlock(&sdp->sd_rindex_spin);
}

/**
 * gfs2_alloc_get - get the struct gfs2_alloc structure for an inode
 * @ip: the incore GFS2 inode structure
 *
 * Returns: the struct gfs2_alloc
 */

struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
{
	struct gfs2_alloc *al = &ip->i_alloc;

	/* FIXME: Should assert that the correct locks are held here... */
	memset(al, 0, sizeof(*al));
	return al;
}

/**
 * try_rgrp_fit - See if a given reservation will fit in a given RG
 * @rgd: the RG data
 * @al: the struct gfs2_alloc structure describing the reservation
 *
 * If there's room for the requested blocks to be allocated from the RG:
 *   Sets the $al_rgd field in @al.
 *
 * Returns: 1 on success (it fits), 0 on failure (it doesn't fit)
 */

static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	int ret = 0;

839
840
841
	if (rgd->rd_rg.rg_flags & GFS2_RGF_NOALLOC)
		return 0;

David Teigland's avatar
David Teigland committed
842
843
844
845
846
847
848
849
850
851
	spin_lock(&sdp->sd_rindex_spin);
	if (rgd->rd_free_clone >= al->al_requested) {
		al->al_rgd = rgd;
		ret = 1;
	}
	spin_unlock(&sdp->sd_rindex_spin);

	return ret;
}

852
853
854
855
856
857
858
859
860
861
862
/**
 * try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
 * @rgd: The rgrp
 *
 * Returns: The inode, if one has been found
 */

static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked)
{
	struct inode *inode;
	u32 goal = 0;
863
	u64 no_addr;
864
865
866
867
868
869

	for(;;) {
		goal = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED,
				    GFS2_BLKST_UNLINKED);
		if (goal == 0)
			return 0;
870
871
		no_addr = goal + rgd->rd_data0;
		if (no_addr <= *last_unlinked)
872
			continue;
873
874
875
		*last_unlinked = no_addr;
		inode = gfs2_inode_lookup(rgd->rd_sbd->sd_vfs, DT_UNKNOWN,
					no_addr, 0);
876
877
878
879
880
881
882
883
		if (!IS_ERR(inode))
			return inode;
	}

	rgd->rd_flags &= ~GFS2_RDF_CHECK;
	return NULL;
}

David Teigland's avatar
David Teigland committed
884
885
886
887
888
889
890
891
892
/**
 * recent_rgrp_first - get first RG from "recent" list
 * @sdp: The GFS2 superblock
 * @rglast: address of the rgrp used last
 *
 * Returns: The first rgrp in the recent list
 */

static struct gfs2_rgrpd *recent_rgrp_first(struct gfs2_sbd *sdp,
893
					    u64 rglast)
David Teigland's avatar
David Teigland committed
894
895
896
897
898
899
900
901
902
903
904
905
{
	struct gfs2_rgrpd *rgd = NULL;

	spin_lock(&sdp->sd_rindex_spin);

	if (list_empty(&sdp->sd_rindex_recent_list))
		goto out;

	if (!rglast)
		goto first;

	list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
906
		if (rgd->rd_addr == rglast)
David Teigland's avatar
David Teigland committed
907
908
909
			goto out;
	}

910
first:
David Teigland's avatar
David Teigland committed
911
912
	rgd = list_entry(sdp->sd_rindex_recent_list.next, struct gfs2_rgrpd,
			 rd_recent);
913
out:
David Teigland's avatar
David Teigland committed
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
	spin_unlock(&sdp->sd_rindex_spin);
	return rgd;
}

/**
 * recent_rgrp_next - get next RG from "recent" list
 * @cur_rgd: current rgrp
 * @remove:
 *
 * Returns: The next rgrp in the recent list
 */

static struct gfs2_rgrpd *recent_rgrp_next(struct gfs2_rgrpd *cur_rgd,
					   int remove)
{
	struct gfs2_sbd *sdp = cur_rgd->rd_sbd;
	struct list_head *head;
	struct gfs2_rgrpd *rgd;

	spin_lock(&sdp->sd_rindex_spin);

	head = &sdp->sd_rindex_recent_list;

	list_for_each_entry(rgd, head, rd_recent) {
		if (rgd == cur_rgd) {
			if (cur_rgd->rd_recent.next != head)
				rgd = list_entry(cur_rgd->rd_recent.next,
						 struct gfs2_rgrpd, rd_recent);
			else
				rgd = NULL;

			if (remove)
				list_del(&cur_rgd->rd_recent);

			goto out;
		}
	}

	rgd = NULL;
	if (!list_empty(head))
		rgd = list_entry(head->next, struct gfs2_rgrpd, rd_recent);

956
out:
David Teigland's avatar
David Teigland committed
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
	spin_unlock(&sdp->sd_rindex_spin);
	return rgd;
}

/**
 * recent_rgrp_add - add an RG to tail of "recent" list
 * @new_rgd: The rgrp to add
 *
 */

static void recent_rgrp_add(struct gfs2_rgrpd *new_rgd)
{
	struct gfs2_sbd *sdp = new_rgd->rd_sbd;
	struct gfs2_rgrpd *rgd;
	unsigned int count = 0;
	unsigned int max = sdp->sd_rgrps / gfs2_jindex_size(sdp);

	spin_lock(&sdp->sd_rindex_spin);

	list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
		if (rgd == new_rgd)
			goto out;

		if (++count >= max)
			goto out;
	}
	list_add_tail(&new_rgd->rd_recent, &sdp->sd_rindex_recent_list);

985
out:
David Teigland's avatar
David Teigland committed
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
	spin_unlock(&sdp->sd_rindex_spin);
}

/**
 * forward_rgrp_get - get an rgrp to try next from full list
 * @sdp: The GFS2 superblock
 *
 * Returns: The rgrp to try next
 */

static struct gfs2_rgrpd *forward_rgrp_get(struct gfs2_sbd *sdp)
{
	struct gfs2_rgrpd *rgd;
	unsigned int journals = gfs2_jindex_size(sdp);
	unsigned int rg = 0, x;
For faster browsing, not all history is shown. View entire blame