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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Tim Shimmin87c199c2006-06-09 14:56:16 +10002 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
Nathan Scott7b718762005-11-02 14:58:39 +11003 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "xfs_trans.h"
Nathan Scotta844f452005-11-02 14:38:42 +110025#include "xfs_sb.h"
26#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_dir2.h"
28#include "xfs_dmapi.h"
29#include "xfs_mount.h"
30#include "xfs_error.h"
31#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110032#include "xfs_alloc_btree.h"
33#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110035#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110038#include "xfs_inode_item.h"
39#include "xfs_imap.h"
40#include "xfs_alloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xfs_ialloc.h"
42#include "xfs_log_priv.h"
43#include "xfs_buf_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include "xfs_log_recover.h"
45#include "xfs_extfree_item.h"
46#include "xfs_trans_priv.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include "xfs_quota.h"
48#include "xfs_rw.h"
Christoph Hellwig43355092008-03-27 18:01:08 +110049#include "xfs_utils.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51STATIC int xlog_find_zeroed(xlog_t *, xfs_daddr_t *);
52STATIC int xlog_clear_stale_blocks(xlog_t *, xfs_lsn_t);
53STATIC void xlog_recover_insert_item_backq(xlog_recover_item_t **q,
54 xlog_recover_item_t *item);
55#if defined(DEBUG)
56STATIC void xlog_recover_check_summary(xlog_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#else
58#define xlog_recover_check_summary(log)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#endif
60
61
62/*
63 * Sector aligned buffer routines for buffer create/read/write/access
64 */
65
66#define XLOG_SECTOR_ROUNDUP_BBCOUNT(log, bbs) \
67 ( ((log)->l_sectbb_mask && (bbs & (log)->l_sectbb_mask)) ? \
68 ((bbs + (log)->l_sectbb_mask + 1) & ~(log)->l_sectbb_mask) : (bbs) )
69#define XLOG_SECTOR_ROUNDDOWN_BLKNO(log, bno) ((bno) & ~(log)->l_sectbb_mask)
70
71xfs_buf_t *
72xlog_get_bp(
73 xlog_t *log,
74 int num_bblks)
75{
76 ASSERT(num_bblks > 0);
77
78 if (log->l_sectbb_log) {
79 if (num_bblks > 1)
80 num_bblks += XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1);
81 num_bblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, num_bblks);
82 }
83 return xfs_buf_get_noaddr(BBTOB(num_bblks), log->l_mp->m_logdev_targp);
84}
85
86void
87xlog_put_bp(
88 xfs_buf_t *bp)
89{
90 xfs_buf_free(bp);
91}
92
93
94/*
95 * nbblks should be uint, but oh well. Just want to catch that 32-bit length.
96 */
97int
98xlog_bread(
99 xlog_t *log,
100 xfs_daddr_t blk_no,
101 int nbblks,
102 xfs_buf_t *bp)
103{
104 int error;
105
106 if (log->l_sectbb_log) {
107 blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
108 nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
109 }
110
111 ASSERT(nbblks > 0);
112 ASSERT(BBTOB(nbblks) <= XFS_BUF_SIZE(bp));
113 ASSERT(bp);
114
115 XFS_BUF_SET_ADDR(bp, log->l_logBBstart + blk_no);
116 XFS_BUF_READ(bp);
117 XFS_BUF_BUSY(bp);
118 XFS_BUF_SET_COUNT(bp, BBTOB(nbblks));
119 XFS_BUF_SET_TARGET(bp, log->l_mp->m_logdev_targp);
120
121 xfsbdstrat(log->l_mp, bp);
David Chinnerd64e31a2008-04-10 12:22:17 +1000122 error = xfs_iowait(bp);
123 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 xfs_ioerror_alert("xlog_bread", log->l_mp,
125 bp, XFS_BUF_ADDR(bp));
126 return error;
127}
128
129/*
130 * Write out the buffer at the given block for the given number of blocks.
131 * The buffer is kept locked across the write and is returned locked.
132 * This can only be used for synchronous log writes.
133 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000134STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135xlog_bwrite(
136 xlog_t *log,
137 xfs_daddr_t blk_no,
138 int nbblks,
139 xfs_buf_t *bp)
140{
141 int error;
142
143 if (log->l_sectbb_log) {
144 blk_no = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, blk_no);
145 nbblks = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, nbblks);
146 }
147
148 ASSERT(nbblks > 0);
149 ASSERT(BBTOB(nbblks) <= XFS_BUF_SIZE(bp));
150
151 XFS_BUF_SET_ADDR(bp, log->l_logBBstart + blk_no);
152 XFS_BUF_ZEROFLAGS(bp);
153 XFS_BUF_BUSY(bp);
154 XFS_BUF_HOLD(bp);
155 XFS_BUF_PSEMA(bp, PRIBIO);
156 XFS_BUF_SET_COUNT(bp, BBTOB(nbblks));
157 XFS_BUF_SET_TARGET(bp, log->l_mp->m_logdev_targp);
158
159 if ((error = xfs_bwrite(log->l_mp, bp)))
160 xfs_ioerror_alert("xlog_bwrite", log->l_mp,
161 bp, XFS_BUF_ADDR(bp));
162 return error;
163}
164
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000165STATIC xfs_caddr_t
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166xlog_align(
167 xlog_t *log,
168 xfs_daddr_t blk_no,
169 int nbblks,
170 xfs_buf_t *bp)
171{
172 xfs_caddr_t ptr;
173
174 if (!log->l_sectbb_log)
175 return XFS_BUF_PTR(bp);
176
177 ptr = XFS_BUF_PTR(bp) + BBTOB((int)blk_no & log->l_sectbb_mask);
178 ASSERT(XFS_BUF_SIZE(bp) >=
179 BBTOB(nbblks + (blk_no & log->l_sectbb_mask)));
180 return ptr;
181}
182
183#ifdef DEBUG
184/*
185 * dump debug superblock and log record information
186 */
187STATIC void
188xlog_header_check_dump(
189 xfs_mount_t *mp,
190 xlog_rec_header_t *head)
191{
192 int b;
193
Harvey Harrison34a622b2008-04-10 12:19:21 +1000194 cmn_err(CE_DEBUG, "%s: SB : uuid = ", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 for (b = 0; b < 16; b++)
Nathan Scottb6574522006-06-09 15:29:40 +1000196 cmn_err(CE_DEBUG, "%02x", ((uchar_t *)&mp->m_sb.sb_uuid)[b]);
197 cmn_err(CE_DEBUG, ", fmt = %d\n", XLOG_FMT);
198 cmn_err(CE_DEBUG, " log : uuid = ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 for (b = 0; b < 16; b++)
Nathan Scottb6574522006-06-09 15:29:40 +1000200 cmn_err(CE_DEBUG, "%02x",((uchar_t *)&head->h_fs_uuid)[b]);
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000201 cmn_err(CE_DEBUG, ", fmt = %d\n", be32_to_cpu(head->h_fmt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203#else
204#define xlog_header_check_dump(mp, head)
205#endif
206
207/*
208 * check log record header for recovery
209 */
210STATIC int
211xlog_header_check_recover(
212 xfs_mount_t *mp,
213 xlog_rec_header_t *head)
214{
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000215 ASSERT(be32_to_cpu(head->h_magicno) == XLOG_HEADER_MAGIC_NUM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 /*
218 * IRIX doesn't write the h_fmt field and leaves it zeroed
219 * (XLOG_FMT_UNKNOWN). This stops us from trying to recover
220 * a dirty log created in IRIX.
221 */
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000222 if (unlikely(be32_to_cpu(head->h_fmt) != XLOG_FMT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 xlog_warn(
224 "XFS: dirty log written in incompatible format - can't recover");
225 xlog_header_check_dump(mp, head);
226 XFS_ERROR_REPORT("xlog_header_check_recover(1)",
227 XFS_ERRLEVEL_HIGH, mp);
228 return XFS_ERROR(EFSCORRUPTED);
229 } else if (unlikely(!uuid_equal(&mp->m_sb.sb_uuid, &head->h_fs_uuid))) {
230 xlog_warn(
231 "XFS: dirty log entry has mismatched uuid - can't recover");
232 xlog_header_check_dump(mp, head);
233 XFS_ERROR_REPORT("xlog_header_check_recover(2)",
234 XFS_ERRLEVEL_HIGH, mp);
235 return XFS_ERROR(EFSCORRUPTED);
236 }
237 return 0;
238}
239
240/*
241 * read the head block of the log and check the header
242 */
243STATIC int
244xlog_header_check_mount(
245 xfs_mount_t *mp,
246 xlog_rec_header_t *head)
247{
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000248 ASSERT(be32_to_cpu(head->h_magicno) == XLOG_HEADER_MAGIC_NUM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250 if (uuid_is_nil(&head->h_fs_uuid)) {
251 /*
252 * IRIX doesn't write the h_fs_uuid or h_fmt fields. If
253 * h_fs_uuid is nil, we assume this log was last mounted
254 * by IRIX and continue.
255 */
256 xlog_warn("XFS: nil uuid in log - IRIX style log");
257 } else if (unlikely(!uuid_equal(&mp->m_sb.sb_uuid, &head->h_fs_uuid))) {
258 xlog_warn("XFS: log has mismatched uuid - can't recover");
259 xlog_header_check_dump(mp, head);
260 XFS_ERROR_REPORT("xlog_header_check_mount",
261 XFS_ERRLEVEL_HIGH, mp);
262 return XFS_ERROR(EFSCORRUPTED);
263 }
264 return 0;
265}
266
267STATIC void
268xlog_recover_iodone(
269 struct xfs_buf *bp)
270{
271 xfs_mount_t *mp;
272
273 ASSERT(XFS_BUF_FSPRIVATE(bp, void *));
274
275 if (XFS_BUF_GETERROR(bp)) {
276 /*
277 * We're not going to bother about retrying
278 * this during recovery. One strike!
279 */
280 mp = XFS_BUF_FSPRIVATE(bp, xfs_mount_t *);
281 xfs_ioerror_alert("xlog_recover_iodone",
282 mp, bp, XFS_BUF_ADDR(bp));
Nathan Scott7d04a332006-06-09 14:58:38 +1000283 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
285 XFS_BUF_SET_FSPRIVATE(bp, NULL);
286 XFS_BUF_CLR_IODONE_FUNC(bp);
287 xfs_biodone(bp);
288}
289
290/*
291 * This routine finds (to an approximation) the first block in the physical
292 * log which contains the given cycle. It uses a binary search algorithm.
293 * Note that the algorithm can not be perfect because the disk will not
294 * necessarily be perfect.
295 */
David Chinnera8272ce2007-11-23 16:28:09 +1100296STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297xlog_find_cycle_start(
298 xlog_t *log,
299 xfs_buf_t *bp,
300 xfs_daddr_t first_blk,
301 xfs_daddr_t *last_blk,
302 uint cycle)
303{
304 xfs_caddr_t offset;
305 xfs_daddr_t mid_blk;
306 uint mid_cycle;
307 int error;
308
309 mid_blk = BLK_AVG(first_blk, *last_blk);
310 while (mid_blk != first_blk && mid_blk != *last_blk) {
311 if ((error = xlog_bread(log, mid_blk, 1, bp)))
312 return error;
313 offset = xlog_align(log, mid_blk, 1, bp);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +1000314 mid_cycle = xlog_get_cycle(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 if (mid_cycle == cycle) {
316 *last_blk = mid_blk;
317 /* last_half_cycle == mid_cycle */
318 } else {
319 first_blk = mid_blk;
320 /* first_half_cycle == mid_cycle */
321 }
322 mid_blk = BLK_AVG(first_blk, *last_blk);
323 }
324 ASSERT((mid_blk == first_blk && mid_blk+1 == *last_blk) ||
325 (mid_blk == *last_blk && mid_blk-1 == first_blk));
326
327 return 0;
328}
329
330/*
331 * Check that the range of blocks does not contain the cycle number
332 * given. The scan needs to occur from front to back and the ptr into the
333 * region must be updated since a later routine will need to perform another
334 * test. If the region is completely good, we end up returning the same
335 * last block number.
336 *
337 * Set blkno to -1 if we encounter no errors. This is an invalid block number
338 * since we don't ever expect logs to get this large.
339 */
340STATIC int
341xlog_find_verify_cycle(
342 xlog_t *log,
343 xfs_daddr_t start_blk,
344 int nbblks,
345 uint stop_on_cycle_no,
346 xfs_daddr_t *new_blk)
347{
348 xfs_daddr_t i, j;
349 uint cycle;
350 xfs_buf_t *bp;
351 xfs_daddr_t bufblks;
352 xfs_caddr_t buf = NULL;
353 int error = 0;
354
355 bufblks = 1 << ffs(nbblks);
356
357 while (!(bp = xlog_get_bp(log, bufblks))) {
358 /* can't get enough memory to do everything in one big buffer */
359 bufblks >>= 1;
360 if (bufblks <= log->l_sectbb_log)
361 return ENOMEM;
362 }
363
364 for (i = start_blk; i < start_blk + nbblks; i += bufblks) {
365 int bcount;
366
367 bcount = min(bufblks, (start_blk + nbblks - i));
368
369 if ((error = xlog_bread(log, i, bcount, bp)))
370 goto out;
371
372 buf = xlog_align(log, i, bcount, bp);
373 for (j = 0; j < bcount; j++) {
Christoph Hellwig03bea6f2007-10-12 10:58:05 +1000374 cycle = xlog_get_cycle(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 if (cycle == stop_on_cycle_no) {
376 *new_blk = i+j;
377 goto out;
378 }
379
380 buf += BBSIZE;
381 }
382 }
383
384 *new_blk = -1;
385
386out:
387 xlog_put_bp(bp);
388 return error;
389}
390
391/*
392 * Potentially backup over partial log record write.
393 *
394 * In the typical case, last_blk is the number of the block directly after
395 * a good log record. Therefore, we subtract one to get the block number
396 * of the last block in the given buffer. extra_bblks contains the number
397 * of blocks we would have read on a previous read. This happens when the
398 * last log record is split over the end of the physical log.
399 *
400 * extra_bblks is the number of blocks potentially verified on a previous
401 * call to this routine.
402 */
403STATIC int
404xlog_find_verify_log_record(
405 xlog_t *log,
406 xfs_daddr_t start_blk,
407 xfs_daddr_t *last_blk,
408 int extra_bblks)
409{
410 xfs_daddr_t i;
411 xfs_buf_t *bp;
412 xfs_caddr_t offset = NULL;
413 xlog_rec_header_t *head = NULL;
414 int error = 0;
415 int smallmem = 0;
416 int num_blks = *last_blk - start_blk;
417 int xhdrs;
418
419 ASSERT(start_blk != 0 || *last_blk != start_blk);
420
421 if (!(bp = xlog_get_bp(log, num_blks))) {
422 if (!(bp = xlog_get_bp(log, 1)))
423 return ENOMEM;
424 smallmem = 1;
425 } else {
426 if ((error = xlog_bread(log, start_blk, num_blks, bp)))
427 goto out;
428 offset = xlog_align(log, start_blk, num_blks, bp);
429 offset += ((num_blks - 1) << BBSHIFT);
430 }
431
432 for (i = (*last_blk) - 1; i >= 0; i--) {
433 if (i < start_blk) {
434 /* valid log record not found */
435 xlog_warn(
436 "XFS: Log inconsistent (didn't find previous header)");
437 ASSERT(0);
438 error = XFS_ERROR(EIO);
439 goto out;
440 }
441
442 if (smallmem) {
443 if ((error = xlog_bread(log, i, 1, bp)))
444 goto out;
445 offset = xlog_align(log, i, 1, bp);
446 }
447
448 head = (xlog_rec_header_t *)offset;
449
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000450 if (XLOG_HEADER_MAGIC_NUM == be32_to_cpu(head->h_magicno))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 break;
452
453 if (!smallmem)
454 offset -= BBSIZE;
455 }
456
457 /*
458 * We hit the beginning of the physical log & still no header. Return
459 * to caller. If caller can handle a return of -1, then this routine
460 * will be called again for the end of the physical log.
461 */
462 if (i == -1) {
463 error = -1;
464 goto out;
465 }
466
467 /*
468 * We have the final block of the good log (the first block
469 * of the log record _before_ the head. So we check the uuid.
470 */
471 if ((error = xlog_header_check_mount(log->l_mp, head)))
472 goto out;
473
474 /*
475 * We may have found a log record header before we expected one.
476 * last_blk will be the 1st block # with a given cycle #. We may end
477 * up reading an entire log record. In this case, we don't want to
478 * reset last_blk. Only when last_blk points in the middle of a log
479 * record do we update last_blk.
480 */
Eric Sandeen62118702008-03-06 13:44:28 +1100481 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000482 uint h_size = be32_to_cpu(head->h_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 xhdrs = h_size / XLOG_HEADER_CYCLE_SIZE;
485 if (h_size % XLOG_HEADER_CYCLE_SIZE)
486 xhdrs++;
487 } else {
488 xhdrs = 1;
489 }
490
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000491 if (*last_blk - i + extra_bblks !=
492 BTOBB(be32_to_cpu(head->h_len)) + xhdrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 *last_blk = i;
494
495out:
496 xlog_put_bp(bp);
497 return error;
498}
499
500/*
501 * Head is defined to be the point of the log where the next log write
502 * write could go. This means that incomplete LR writes at the end are
503 * eliminated when calculating the head. We aren't guaranteed that previous
504 * LR have complete transactions. We only know that a cycle number of
505 * current cycle number -1 won't be present in the log if we start writing
506 * from our current block number.
507 *
508 * last_blk contains the block number of the first block with a given
509 * cycle number.
510 *
511 * Return: zero if normal, non-zero if error.
512 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000513STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514xlog_find_head(
515 xlog_t *log,
516 xfs_daddr_t *return_head_blk)
517{
518 xfs_buf_t *bp;
519 xfs_caddr_t offset;
520 xfs_daddr_t new_blk, first_blk, start_blk, last_blk, head_blk;
521 int num_scan_bblks;
522 uint first_half_cycle, last_half_cycle;
523 uint stop_on_cycle;
524 int error, log_bbnum = log->l_logBBsize;
525
526 /* Is the end of the log device zeroed? */
527 if ((error = xlog_find_zeroed(log, &first_blk)) == -1) {
528 *return_head_blk = first_blk;
529
530 /* Is the whole lot zeroed? */
531 if (!first_blk) {
532 /* Linux XFS shouldn't generate totally zeroed logs -
533 * mkfs etc write a dummy unmount record to a fresh
534 * log so we can store the uuid in there
535 */
536 xlog_warn("XFS: totally zeroed log");
537 }
538
539 return 0;
540 } else if (error) {
541 xlog_warn("XFS: empty log check failed");
542 return error;
543 }
544
545 first_blk = 0; /* get cycle # of 1st block */
546 bp = xlog_get_bp(log, 1);
547 if (!bp)
548 return ENOMEM;
549 if ((error = xlog_bread(log, 0, 1, bp)))
550 goto bp_err;
551 offset = xlog_align(log, 0, 1, bp);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +1000552 first_half_cycle = xlog_get_cycle(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554 last_blk = head_blk = log_bbnum - 1; /* get cycle # of last block */
555 if ((error = xlog_bread(log, last_blk, 1, bp)))
556 goto bp_err;
557 offset = xlog_align(log, last_blk, 1, bp);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +1000558 last_half_cycle = xlog_get_cycle(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 ASSERT(last_half_cycle != 0);
560
561 /*
562 * If the 1st half cycle number is equal to the last half cycle number,
563 * then the entire log is stamped with the same cycle number. In this
564 * case, head_blk can't be set to zero (which makes sense). The below
565 * math doesn't work out properly with head_blk equal to zero. Instead,
566 * we set it to log_bbnum which is an invalid block number, but this
567 * value makes the math correct. If head_blk doesn't changed through
568 * all the tests below, *head_blk is set to zero at the very end rather
569 * than log_bbnum. In a sense, log_bbnum and zero are the same block
570 * in a circular file.
571 */
572 if (first_half_cycle == last_half_cycle) {
573 /*
574 * In this case we believe that the entire log should have
575 * cycle number last_half_cycle. We need to scan backwards
576 * from the end verifying that there are no holes still
577 * containing last_half_cycle - 1. If we find such a hole,
578 * then the start of that hole will be the new head. The
579 * simple case looks like
580 * x | x ... | x - 1 | x
581 * Another case that fits this picture would be
582 * x | x + 1 | x ... | x
Nathan Scottc41564b2006-03-29 08:55:14 +1000583 * In this case the head really is somewhere at the end of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 * log, as one of the latest writes at the beginning was
585 * incomplete.
586 * One more case is
587 * x | x + 1 | x ... | x - 1 | x
588 * This is really the combination of the above two cases, and
589 * the head has to end up at the start of the x-1 hole at the
590 * end of the log.
591 *
592 * In the 256k log case, we will read from the beginning to the
593 * end of the log and search for cycle numbers equal to x-1.
594 * We don't worry about the x+1 blocks that we encounter,
595 * because we know that they cannot be the head since the log
596 * started with x.
597 */
598 head_blk = log_bbnum;
599 stop_on_cycle = last_half_cycle - 1;
600 } else {
601 /*
602 * In this case we want to find the first block with cycle
603 * number matching last_half_cycle. We expect the log to be
604 * some variation on
605 * x + 1 ... | x ...
606 * The first block with cycle number x (last_half_cycle) will
607 * be where the new head belongs. First we do a binary search
608 * for the first occurrence of last_half_cycle. The binary
609 * search may not be totally accurate, so then we scan back
610 * from there looking for occurrences of last_half_cycle before
611 * us. If that backwards scan wraps around the beginning of
612 * the log, then we look for occurrences of last_half_cycle - 1
613 * at the end of the log. The cases we're looking for look
614 * like
615 * x + 1 ... | x | x + 1 | x ...
616 * ^ binary search stopped here
617 * or
618 * x + 1 ... | x ... | x - 1 | x
619 * <---------> less than scan distance
620 */
621 stop_on_cycle = last_half_cycle;
622 if ((error = xlog_find_cycle_start(log, bp, first_blk,
623 &head_blk, last_half_cycle)))
624 goto bp_err;
625 }
626
627 /*
628 * Now validate the answer. Scan back some number of maximum possible
629 * blocks and make sure each one has the expected cycle number. The
630 * maximum is determined by the total possible amount of buffering
631 * in the in-core log. The following number can be made tighter if
632 * we actually look at the block size of the filesystem.
633 */
634 num_scan_bblks = XLOG_TOTAL_REC_SHIFT(log);
635 if (head_blk >= num_scan_bblks) {
636 /*
637 * We are guaranteed that the entire check can be performed
638 * in one buffer.
639 */
640 start_blk = head_blk - num_scan_bblks;
641 if ((error = xlog_find_verify_cycle(log,
642 start_blk, num_scan_bblks,
643 stop_on_cycle, &new_blk)))
644 goto bp_err;
645 if (new_blk != -1)
646 head_blk = new_blk;
647 } else { /* need to read 2 parts of log */
648 /*
649 * We are going to scan backwards in the log in two parts.
650 * First we scan the physical end of the log. In this part
651 * of the log, we are looking for blocks with cycle number
652 * last_half_cycle - 1.
653 * If we find one, then we know that the log starts there, as
654 * we've found a hole that didn't get written in going around
655 * the end of the physical log. The simple case for this is
656 * x + 1 ... | x ... | x - 1 | x
657 * <---------> less than scan distance
658 * If all of the blocks at the end of the log have cycle number
659 * last_half_cycle, then we check the blocks at the start of
660 * the log looking for occurrences of last_half_cycle. If we
661 * find one, then our current estimate for the location of the
662 * first occurrence of last_half_cycle is wrong and we move
663 * back to the hole we've found. This case looks like
664 * x + 1 ... | x | x + 1 | x ...
665 * ^ binary search stopped here
666 * Another case we need to handle that only occurs in 256k
667 * logs is
668 * x + 1 ... | x ... | x+1 | x ...
669 * ^ binary search stops here
670 * In a 256k log, the scan at the end of the log will see the
671 * x + 1 blocks. We need to skip past those since that is
672 * certainly not the head of the log. By searching for
673 * last_half_cycle-1 we accomplish that.
674 */
675 start_blk = log_bbnum - num_scan_bblks + head_blk;
676 ASSERT(head_blk <= INT_MAX &&
677 (xfs_daddr_t) num_scan_bblks - head_blk >= 0);
678 if ((error = xlog_find_verify_cycle(log, start_blk,
679 num_scan_bblks - (int)head_blk,
680 (stop_on_cycle - 1), &new_blk)))
681 goto bp_err;
682 if (new_blk != -1) {
683 head_blk = new_blk;
684 goto bad_blk;
685 }
686
687 /*
688 * Scan beginning of log now. The last part of the physical
689 * log is good. This scan needs to verify that it doesn't find
690 * the last_half_cycle.
691 */
692 start_blk = 0;
693 ASSERT(head_blk <= INT_MAX);
694 if ((error = xlog_find_verify_cycle(log,
695 start_blk, (int)head_blk,
696 stop_on_cycle, &new_blk)))
697 goto bp_err;
698 if (new_blk != -1)
699 head_blk = new_blk;
700 }
701
702 bad_blk:
703 /*
704 * Now we need to make sure head_blk is not pointing to a block in
705 * the middle of a log record.
706 */
707 num_scan_bblks = XLOG_REC_SHIFT(log);
708 if (head_blk >= num_scan_bblks) {
709 start_blk = head_blk - num_scan_bblks; /* don't read head_blk */
710
711 /* start ptr at last block ptr before head_blk */
712 if ((error = xlog_find_verify_log_record(log, start_blk,
713 &head_blk, 0)) == -1) {
714 error = XFS_ERROR(EIO);
715 goto bp_err;
716 } else if (error)
717 goto bp_err;
718 } else {
719 start_blk = 0;
720 ASSERT(head_blk <= INT_MAX);
721 if ((error = xlog_find_verify_log_record(log, start_blk,
722 &head_blk, 0)) == -1) {
723 /* We hit the beginning of the log during our search */
724 start_blk = log_bbnum - num_scan_bblks + head_blk;
725 new_blk = log_bbnum;
726 ASSERT(start_blk <= INT_MAX &&
727 (xfs_daddr_t) log_bbnum-start_blk >= 0);
728 ASSERT(head_blk <= INT_MAX);
729 if ((error = xlog_find_verify_log_record(log,
730 start_blk, &new_blk,
731 (int)head_blk)) == -1) {
732 error = XFS_ERROR(EIO);
733 goto bp_err;
734 } else if (error)
735 goto bp_err;
736 if (new_blk != log_bbnum)
737 head_blk = new_blk;
738 } else if (error)
739 goto bp_err;
740 }
741
742 xlog_put_bp(bp);
743 if (head_blk == log_bbnum)
744 *return_head_blk = 0;
745 else
746 *return_head_blk = head_blk;
747 /*
748 * When returning here, we have a good block number. Bad block
749 * means that during a previous crash, we didn't have a clean break
750 * from cycle number N to cycle number N-1. In this case, we need
751 * to find the first block with cycle number N-1.
752 */
753 return 0;
754
755 bp_err:
756 xlog_put_bp(bp);
757
758 if (error)
759 xlog_warn("XFS: failed to find log head");
760 return error;
761}
762
763/*
764 * Find the sync block number or the tail of the log.
765 *
766 * This will be the block number of the last record to have its
767 * associated buffers synced to disk. Every log record header has
768 * a sync lsn embedded in it. LSNs hold block numbers, so it is easy
769 * to get a sync block number. The only concern is to figure out which
770 * log record header to believe.
771 *
772 * The following algorithm uses the log record header with the largest
773 * lsn. The entire log record does not need to be valid. We only care
774 * that the header is valid.
775 *
776 * We could speed up search by using current head_blk buffer, but it is not
777 * available.
778 */
779int
780xlog_find_tail(
781 xlog_t *log,
782 xfs_daddr_t *head_blk,
Eric Sandeen65be6052006-01-11 15:34:19 +1100783 xfs_daddr_t *tail_blk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784{
785 xlog_rec_header_t *rhead;
786 xlog_op_header_t *op_head;
787 xfs_caddr_t offset = NULL;
788 xfs_buf_t *bp;
789 int error, i, found;
790 xfs_daddr_t umount_data_blk;
791 xfs_daddr_t after_umount_blk;
792 xfs_lsn_t tail_lsn;
793 int hblks;
794
795 found = 0;
796
797 /*
798 * Find previous log record
799 */
800 if ((error = xlog_find_head(log, head_blk)))
801 return error;
802
803 bp = xlog_get_bp(log, 1);
804 if (!bp)
805 return ENOMEM;
806 if (*head_blk == 0) { /* special case */
807 if ((error = xlog_bread(log, 0, 1, bp)))
808 goto bread_err;
809 offset = xlog_align(log, 0, 1, bp);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +1000810 if (xlog_get_cycle(offset) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 *tail_blk = 0;
812 /* leave all other log inited values alone */
813 goto exit;
814 }
815 }
816
817 /*
818 * Search backwards looking for log record header block
819 */
820 ASSERT(*head_blk < INT_MAX);
821 for (i = (int)(*head_blk) - 1; i >= 0; i--) {
822 if ((error = xlog_bread(log, i, 1, bp)))
823 goto bread_err;
824 offset = xlog_align(log, i, 1, bp);
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000825 if (XLOG_HEADER_MAGIC_NUM == be32_to_cpu(*(__be32 *)offset)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 found = 1;
827 break;
828 }
829 }
830 /*
831 * If we haven't found the log record header block, start looking
832 * again from the end of the physical log. XXXmiken: There should be
833 * a check here to make sure we didn't search more than N blocks in
834 * the previous code.
835 */
836 if (!found) {
837 for (i = log->l_logBBsize - 1; i >= (int)(*head_blk); i--) {
838 if ((error = xlog_bread(log, i, 1, bp)))
839 goto bread_err;
840 offset = xlog_align(log, i, 1, bp);
841 if (XLOG_HEADER_MAGIC_NUM ==
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000842 be32_to_cpu(*(__be32 *)offset)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 found = 2;
844 break;
845 }
846 }
847 }
848 if (!found) {
849 xlog_warn("XFS: xlog_find_tail: couldn't find sync record");
850 ASSERT(0);
851 return XFS_ERROR(EIO);
852 }
853
854 /* find blk_no of tail of log */
855 rhead = (xlog_rec_header_t *)offset;
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000856 *tail_blk = BLOCK_LSN(be64_to_cpu(rhead->h_tail_lsn));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 /*
859 * Reset log values according to the state of the log when we
860 * crashed. In the case where head_blk == 0, we bump curr_cycle
861 * one because the next write starts a new cycle rather than
862 * continuing the cycle of the last good log record. At this
863 * point we have guaranteed that all partial log records have been
864 * accounted for. Therefore, we know that the last good log record
865 * written was complete and ended exactly on the end boundary
866 * of the physical log.
867 */
868 log->l_prev_block = i;
869 log->l_curr_block = (int)*head_blk;
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000870 log->l_curr_cycle = be32_to_cpu(rhead->h_cycle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 if (found == 2)
872 log->l_curr_cycle++;
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000873 log->l_tail_lsn = be64_to_cpu(rhead->h_tail_lsn);
874 log->l_last_sync_lsn = be64_to_cpu(rhead->h_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 log->l_grant_reserve_cycle = log->l_curr_cycle;
876 log->l_grant_reserve_bytes = BBTOB(log->l_curr_block);
877 log->l_grant_write_cycle = log->l_curr_cycle;
878 log->l_grant_write_bytes = BBTOB(log->l_curr_block);
879
880 /*
881 * Look for unmount record. If we find it, then we know there
882 * was a clean unmount. Since 'i' could be the last block in
883 * the physical log, we convert to a log block before comparing
884 * to the head_blk.
885 *
886 * Save the current tail lsn to use to pass to
887 * xlog_clear_stale_blocks() below. We won't want to clear the
888 * unmount record if there is one, so we pass the lsn of the
889 * unmount record rather than the block after it.
890 */
Eric Sandeen62118702008-03-06 13:44:28 +1100891 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000892 int h_size = be32_to_cpu(rhead->h_size);
893 int h_version = be32_to_cpu(rhead->h_version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
895 if ((h_version & XLOG_VERSION_2) &&
896 (h_size > XLOG_HEADER_CYCLE_SIZE)) {
897 hblks = h_size / XLOG_HEADER_CYCLE_SIZE;
898 if (h_size % XLOG_HEADER_CYCLE_SIZE)
899 hblks++;
900 } else {
901 hblks = 1;
902 }
903 } else {
904 hblks = 1;
905 }
906 after_umount_blk = (i + hblks + (int)
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000907 BTOBB(be32_to_cpu(rhead->h_len))) % log->l_logBBsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 tail_lsn = log->l_tail_lsn;
909 if (*head_blk == after_umount_blk &&
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000910 be32_to_cpu(rhead->h_num_logops) == 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 umount_data_blk = (i + hblks) % log->l_logBBsize;
912 if ((error = xlog_bread(log, umount_data_blk, 1, bp))) {
913 goto bread_err;
914 }
915 offset = xlog_align(log, umount_data_blk, 1, bp);
916 op_head = (xlog_op_header_t *)offset;
917 if (op_head->oh_flags & XLOG_UNMOUNT_TRANS) {
918 /*
919 * Set tail and last sync so that newly written
920 * log records will point recovery to after the
921 * current unmount record.
922 */
Christoph Hellwig03bea6f2007-10-12 10:58:05 +1000923 log->l_tail_lsn =
924 xlog_assign_lsn(log->l_curr_cycle,
925 after_umount_blk);
926 log->l_last_sync_lsn =
927 xlog_assign_lsn(log->l_curr_cycle,
928 after_umount_blk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 *tail_blk = after_umount_blk;
David Chinner92821e22007-05-24 15:26:31 +1000930
931 /*
932 * Note that the unmount was clean. If the unmount
933 * was not clean, we need to know this to rebuild the
934 * superblock counters from the perag headers if we
935 * have a filesystem using non-persistent counters.
936 */
937 log->l_mp->m_flags |= XFS_MOUNT_WAS_CLEAN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 }
939 }
940
941 /*
942 * Make sure that there are no blocks in front of the head
943 * with the same cycle number as the head. This can happen
944 * because we allow multiple outstanding log writes concurrently,
945 * and the later writes might make it out before earlier ones.
946 *
947 * We use the lsn from before modifying it so that we'll never
948 * overwrite the unmount record after a clean unmount.
949 *
950 * Do this only if we are going to recover the filesystem
951 *
952 * NOTE: This used to say "if (!readonly)"
953 * However on Linux, we can & do recover a read-only filesystem.
954 * We only skip recovery if NORECOVERY is specified on mount,
955 * in which case we would not be here.
956 *
957 * But... if the -device- itself is readonly, just skip this.
958 * We can't recover this device anyway, so it won't matter.
959 */
960 if (!xfs_readonly_buftarg(log->l_mp->m_logdev_targp)) {
961 error = xlog_clear_stale_blocks(log, tail_lsn);
962 }
963
964bread_err:
965exit:
966 xlog_put_bp(bp);
967
968 if (error)
969 xlog_warn("XFS: failed to locate log tail");
970 return error;
971}
972
973/*
974 * Is the log zeroed at all?
975 *
976 * The last binary search should be changed to perform an X block read
977 * once X becomes small enough. You can then search linearly through
978 * the X blocks. This will cut down on the number of reads we need to do.
979 *
980 * If the log is partially zeroed, this routine will pass back the blkno
981 * of the first block with cycle number 0. It won't have a complete LR
982 * preceding it.
983 *
984 * Return:
985 * 0 => the log is completely written to
986 * -1 => use *blk_no as the first block of the log
987 * >0 => error has occurred
988 */
David Chinnera8272ce2007-11-23 16:28:09 +1100989STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990xlog_find_zeroed(
991 xlog_t *log,
992 xfs_daddr_t *blk_no)
993{
994 xfs_buf_t *bp;
995 xfs_caddr_t offset;
996 uint first_cycle, last_cycle;
997 xfs_daddr_t new_blk, last_blk, start_blk;
998 xfs_daddr_t num_scan_bblks;
999 int error, log_bbnum = log->l_logBBsize;
1000
Nathan Scott6fdf8cc2006-06-28 10:13:52 +10001001 *blk_no = 0;
1002
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 /* check totally zeroed log */
1004 bp = xlog_get_bp(log, 1);
1005 if (!bp)
1006 return ENOMEM;
1007 if ((error = xlog_bread(log, 0, 1, bp)))
1008 goto bp_err;
1009 offset = xlog_align(log, 0, 1, bp);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10001010 first_cycle = xlog_get_cycle(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 if (first_cycle == 0) { /* completely zeroed log */
1012 *blk_no = 0;
1013 xlog_put_bp(bp);
1014 return -1;
1015 }
1016
1017 /* check partially zeroed log */
1018 if ((error = xlog_bread(log, log_bbnum-1, 1, bp)))
1019 goto bp_err;
1020 offset = xlog_align(log, log_bbnum-1, 1, bp);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10001021 last_cycle = xlog_get_cycle(offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 if (last_cycle != 0) { /* log completely written to */
1023 xlog_put_bp(bp);
1024 return 0;
1025 } else if (first_cycle != 1) {
1026 /*
1027 * If the cycle of the last block is zero, the cycle of
1028 * the first block must be 1. If it's not, maybe we're
1029 * not looking at a log... Bail out.
1030 */
1031 xlog_warn("XFS: Log inconsistent or not a log (last==0, first!=1)");
1032 return XFS_ERROR(EINVAL);
1033 }
1034
1035 /* we have a partially zeroed log */
1036 last_blk = log_bbnum-1;
1037 if ((error = xlog_find_cycle_start(log, bp, 0, &last_blk, 0)))
1038 goto bp_err;
1039
1040 /*
1041 * Validate the answer. Because there is no way to guarantee that
1042 * the entire log is made up of log records which are the same size,
1043 * we scan over the defined maximum blocks. At this point, the maximum
1044 * is not chosen to mean anything special. XXXmiken
1045 */
1046 num_scan_bblks = XLOG_TOTAL_REC_SHIFT(log);
1047 ASSERT(num_scan_bblks <= INT_MAX);
1048
1049 if (last_blk < num_scan_bblks)
1050 num_scan_bblks = last_blk;
1051 start_blk = last_blk - num_scan_bblks;
1052
1053 /*
1054 * We search for any instances of cycle number 0 that occur before
1055 * our current estimate of the head. What we're trying to detect is
1056 * 1 ... | 0 | 1 | 0...
1057 * ^ binary search ends here
1058 */
1059 if ((error = xlog_find_verify_cycle(log, start_blk,
1060 (int)num_scan_bblks, 0, &new_blk)))
1061 goto bp_err;
1062 if (new_blk != -1)
1063 last_blk = new_blk;
1064
1065 /*
1066 * Potentially backup over partial log record write. We don't need
1067 * to search the end of the log because we know it is zero.
1068 */
1069 if ((error = xlog_find_verify_log_record(log, start_blk,
1070 &last_blk, 0)) == -1) {
1071 error = XFS_ERROR(EIO);
1072 goto bp_err;
1073 } else if (error)
1074 goto bp_err;
1075
1076 *blk_no = last_blk;
1077bp_err:
1078 xlog_put_bp(bp);
1079 if (error)
1080 return error;
1081 return -1;
1082}
1083
1084/*
1085 * These are simple subroutines used by xlog_clear_stale_blocks() below
1086 * to initialize a buffer full of empty log record headers and write
1087 * them into the log.
1088 */
1089STATIC void
1090xlog_add_record(
1091 xlog_t *log,
1092 xfs_caddr_t buf,
1093 int cycle,
1094 int block,
1095 int tail_cycle,
1096 int tail_block)
1097{
1098 xlog_rec_header_t *recp = (xlog_rec_header_t *)buf;
1099
1100 memset(buf, 0, BBSIZE);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001101 recp->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
1102 recp->h_cycle = cpu_to_be32(cycle);
1103 recp->h_version = cpu_to_be32(
Eric Sandeen62118702008-03-06 13:44:28 +11001104 xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001105 recp->h_lsn = cpu_to_be64(xlog_assign_lsn(cycle, block));
1106 recp->h_tail_lsn = cpu_to_be64(xlog_assign_lsn(tail_cycle, tail_block));
1107 recp->h_fmt = cpu_to_be32(XLOG_FMT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 memcpy(&recp->h_fs_uuid, &log->l_mp->m_sb.sb_uuid, sizeof(uuid_t));
1109}
1110
1111STATIC int
1112xlog_write_log_records(
1113 xlog_t *log,
1114 int cycle,
1115 int start_block,
1116 int blocks,
1117 int tail_cycle,
1118 int tail_block)
1119{
1120 xfs_caddr_t offset;
1121 xfs_buf_t *bp;
1122 int balign, ealign;
1123 int sectbb = XLOG_SECTOR_ROUNDUP_BBCOUNT(log, 1);
1124 int end_block = start_block + blocks;
1125 int bufblks;
1126 int error = 0;
1127 int i, j = 0;
1128
1129 bufblks = 1 << ffs(blocks);
1130 while (!(bp = xlog_get_bp(log, bufblks))) {
1131 bufblks >>= 1;
1132 if (bufblks <= log->l_sectbb_log)
1133 return ENOMEM;
1134 }
1135
1136 /* We may need to do a read at the start to fill in part of
1137 * the buffer in the starting sector not covered by the first
1138 * write below.
1139 */
1140 balign = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, start_block);
1141 if (balign != start_block) {
1142 if ((error = xlog_bread(log, start_block, 1, bp))) {
1143 xlog_put_bp(bp);
1144 return error;
1145 }
1146 j = start_block - balign;
1147 }
1148
1149 for (i = start_block; i < end_block; i += bufblks) {
1150 int bcount, endcount;
1151
1152 bcount = min(bufblks, end_block - start_block);
1153 endcount = bcount - j;
1154
1155 /* We may need to do a read at the end to fill in part of
1156 * the buffer in the final sector not covered by the write.
1157 * If this is the same sector as the above read, skip it.
1158 */
1159 ealign = XLOG_SECTOR_ROUNDDOWN_BLKNO(log, end_block);
1160 if (j == 0 && (start_block + endcount > ealign)) {
1161 offset = XFS_BUF_PTR(bp);
1162 balign = BBTOB(ealign - start_block);
David Chinner234f56a2008-04-10 12:24:24 +10001163 error = XFS_BUF_SET_PTR(bp, offset + balign,
1164 BBTOB(sectbb));
1165 if (!error)
1166 error = xlog_bread(log, ealign, sectbb, bp);
1167 if (!error)
1168 error = XFS_BUF_SET_PTR(bp, offset, bufblks);
1169 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 }
1172
1173 offset = xlog_align(log, start_block, endcount, bp);
1174 for (; j < endcount; j++) {
1175 xlog_add_record(log, offset, cycle, i+j,
1176 tail_cycle, tail_block);
1177 offset += BBSIZE;
1178 }
1179 error = xlog_bwrite(log, start_block, endcount, bp);
1180 if (error)
1181 break;
1182 start_block += endcount;
1183 j = 0;
1184 }
1185 xlog_put_bp(bp);
1186 return error;
1187}
1188
1189/*
1190 * This routine is called to blow away any incomplete log writes out
1191 * in front of the log head. We do this so that we won't become confused
1192 * if we come up, write only a little bit more, and then crash again.
1193 * If we leave the partial log records out there, this situation could
1194 * cause us to think those partial writes are valid blocks since they
1195 * have the current cycle number. We get rid of them by overwriting them
1196 * with empty log records with the old cycle number rather than the
1197 * current one.
1198 *
1199 * The tail lsn is passed in rather than taken from
1200 * the log so that we will not write over the unmount record after a
1201 * clean unmount in a 512 block log. Doing so would leave the log without
1202 * any valid log records in it until a new one was written. If we crashed
1203 * during that time we would not be able to recover.
1204 */
1205STATIC int
1206xlog_clear_stale_blocks(
1207 xlog_t *log,
1208 xfs_lsn_t tail_lsn)
1209{
1210 int tail_cycle, head_cycle;
1211 int tail_block, head_block;
1212 int tail_distance, max_distance;
1213 int distance;
1214 int error;
1215
1216 tail_cycle = CYCLE_LSN(tail_lsn);
1217 tail_block = BLOCK_LSN(tail_lsn);
1218 head_cycle = log->l_curr_cycle;
1219 head_block = log->l_curr_block;
1220
1221 /*
1222 * Figure out the distance between the new head of the log
1223 * and the tail. We want to write over any blocks beyond the
1224 * head that we may have written just before the crash, but
1225 * we don't want to overwrite the tail of the log.
1226 */
1227 if (head_cycle == tail_cycle) {
1228 /*
1229 * The tail is behind the head in the physical log,
1230 * so the distance from the head to the tail is the
1231 * distance from the head to the end of the log plus
1232 * the distance from the beginning of the log to the
1233 * tail.
1234 */
1235 if (unlikely(head_block < tail_block || head_block >= log->l_logBBsize)) {
1236 XFS_ERROR_REPORT("xlog_clear_stale_blocks(1)",
1237 XFS_ERRLEVEL_LOW, log->l_mp);
1238 return XFS_ERROR(EFSCORRUPTED);
1239 }
1240 tail_distance = tail_block + (log->l_logBBsize - head_block);
1241 } else {
1242 /*
1243 * The head is behind the tail in the physical log,
1244 * so the distance from the head to the tail is just
1245 * the tail block minus the head block.
1246 */
1247 if (unlikely(head_block >= tail_block || head_cycle != (tail_cycle + 1))){
1248 XFS_ERROR_REPORT("xlog_clear_stale_blocks(2)",
1249 XFS_ERRLEVEL_LOW, log->l_mp);
1250 return XFS_ERROR(EFSCORRUPTED);
1251 }
1252 tail_distance = tail_block - head_block;
1253 }
1254
1255 /*
1256 * If the head is right up against the tail, we can't clear
1257 * anything.
1258 */
1259 if (tail_distance <= 0) {
1260 ASSERT(tail_distance == 0);
1261 return 0;
1262 }
1263
1264 max_distance = XLOG_TOTAL_REC_SHIFT(log);
1265 /*
1266 * Take the smaller of the maximum amount of outstanding I/O
1267 * we could have and the distance to the tail to clear out.
1268 * We take the smaller so that we don't overwrite the tail and
1269 * we don't waste all day writing from the head to the tail
1270 * for no reason.
1271 */
1272 max_distance = MIN(max_distance, tail_distance);
1273
1274 if ((head_block + max_distance) <= log->l_logBBsize) {
1275 /*
1276 * We can stomp all the blocks we need to without
1277 * wrapping around the end of the log. Just do it
1278 * in a single write. Use the cycle number of the
1279 * current cycle minus one so that the log will look like:
1280 * n ... | n - 1 ...
1281 */
1282 error = xlog_write_log_records(log, (head_cycle - 1),
1283 head_block, max_distance, tail_cycle,
1284 tail_block);
1285 if (error)
1286 return error;
1287 } else {
1288 /*
1289 * We need to wrap around the end of the physical log in
1290 * order to clear all the blocks. Do it in two separate
1291 * I/Os. The first write should be from the head to the
1292 * end of the physical log, and it should use the current
1293 * cycle number minus one just like above.
1294 */
1295 distance = log->l_logBBsize - head_block;
1296 error = xlog_write_log_records(log, (head_cycle - 1),
1297 head_block, distance, tail_cycle,
1298 tail_block);
1299
1300 if (error)
1301 return error;
1302
1303 /*
1304 * Now write the blocks at the start of the physical log.
1305 * This writes the remainder of the blocks we want to clear.
1306 * It uses the current cycle number since we're now on the
1307 * same cycle as the head so that we get:
1308 * n ... n ... | n - 1 ...
1309 * ^^^^^ blocks we're writing
1310 */
1311 distance = max_distance - (log->l_logBBsize - head_block);
1312 error = xlog_write_log_records(log, head_cycle, 0, distance,
1313 tail_cycle, tail_block);
1314 if (error)
1315 return error;
1316 }
1317
1318 return 0;
1319}
1320
1321/******************************************************************************
1322 *
1323 * Log recover routines
1324 *
1325 ******************************************************************************
1326 */
1327
1328STATIC xlog_recover_t *
1329xlog_recover_find_tid(
1330 xlog_recover_t *q,
1331 xlog_tid_t tid)
1332{
1333 xlog_recover_t *p = q;
1334
1335 while (p != NULL) {
1336 if (p->r_log_tid == tid)
1337 break;
1338 p = p->r_next;
1339 }
1340 return p;
1341}
1342
1343STATIC void
1344xlog_recover_put_hashq(
1345 xlog_recover_t **q,
1346 xlog_recover_t *trans)
1347{
1348 trans->r_next = *q;
1349 *q = trans;
1350}
1351
1352STATIC void
1353xlog_recover_add_item(
1354 xlog_recover_item_t **itemq)
1355{
1356 xlog_recover_item_t *item;
1357
1358 item = kmem_zalloc(sizeof(xlog_recover_item_t), KM_SLEEP);
1359 xlog_recover_insert_item_backq(itemq, item);
1360}
1361
1362STATIC int
1363xlog_recover_add_to_cont_trans(
1364 xlog_recover_t *trans,
1365 xfs_caddr_t dp,
1366 int len)
1367{
1368 xlog_recover_item_t *item;
1369 xfs_caddr_t ptr, old_ptr;
1370 int old_len;
1371
1372 item = trans->r_itemq;
Christoph Hellwig4b809162007-08-16 15:37:36 +10001373 if (item == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 /* finish copying rest of trans header */
1375 xlog_recover_add_item(&trans->r_itemq);
1376 ptr = (xfs_caddr_t) &trans->r_theader +
1377 sizeof(xfs_trans_header_t) - len;
1378 memcpy(ptr, dp, len); /* d, s, l */
1379 return 0;
1380 }
1381 item = item->ri_prev;
1382
1383 old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
1384 old_len = item->ri_buf[item->ri_cnt-1].i_len;
1385
Christoph Hellwig760dea62005-09-02 16:56:02 +10001386 ptr = kmem_realloc(old_ptr, len+old_len, old_len, 0u);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 memcpy(&ptr[old_len], dp, len); /* d, s, l */
1388 item->ri_buf[item->ri_cnt-1].i_len += len;
1389 item->ri_buf[item->ri_cnt-1].i_addr = ptr;
1390 return 0;
1391}
1392
1393/*
1394 * The next region to add is the start of a new region. It could be
1395 * a whole region or it could be the first part of a new region. Because
1396 * of this, the assumption here is that the type and size fields of all
1397 * format structures fit into the first 32 bits of the structure.
1398 *
1399 * This works because all regions must be 32 bit aligned. Therefore, we
1400 * either have both fields or we have neither field. In the case we have
1401 * neither field, the data part of the region is zero length. We only have
1402 * a log_op_header and can throw away the header since a new one will appear
1403 * later. If we have at least 4 bytes, then we can determine how many regions
1404 * will appear in the current log item.
1405 */
1406STATIC int
1407xlog_recover_add_to_trans(
1408 xlog_recover_t *trans,
1409 xfs_caddr_t dp,
1410 int len)
1411{
1412 xfs_inode_log_format_t *in_f; /* any will do */
1413 xlog_recover_item_t *item;
1414 xfs_caddr_t ptr;
1415
1416 if (!len)
1417 return 0;
1418 item = trans->r_itemq;
Christoph Hellwig4b809162007-08-16 15:37:36 +10001419 if (item == NULL) {
David Chinner5a792c42008-10-30 17:40:09 +11001420 /* we need to catch log corruptions here */
1421 if (*(uint *)dp != XFS_TRANS_HEADER_MAGIC) {
1422 xlog_warn("XFS: xlog_recover_add_to_trans: "
1423 "bad header magic number");
1424 ASSERT(0);
1425 return XFS_ERROR(EIO);
1426 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 if (len == sizeof(xfs_trans_header_t))
1428 xlog_recover_add_item(&trans->r_itemq);
1429 memcpy(&trans->r_theader, dp, len); /* d, s, l */
1430 return 0;
1431 }
1432
1433 ptr = kmem_alloc(len, KM_SLEEP);
1434 memcpy(ptr, dp, len);
1435 in_f = (xfs_inode_log_format_t *)ptr;
1436
1437 if (item->ri_prev->ri_total != 0 &&
1438 item->ri_prev->ri_total == item->ri_prev->ri_cnt) {
1439 xlog_recover_add_item(&trans->r_itemq);
1440 }
1441 item = trans->r_itemq;
1442 item = item->ri_prev;
1443
1444 if (item->ri_total == 0) { /* first region to be added */
1445 item->ri_total = in_f->ilf_size;
1446 ASSERT(item->ri_total <= XLOG_MAX_REGIONS_IN_ITEM);
1447 item->ri_buf = kmem_zalloc((item->ri_total *
1448 sizeof(xfs_log_iovec_t)), KM_SLEEP);
1449 }
1450 ASSERT(item->ri_total > item->ri_cnt);
1451 /* Description region is ri_buf[0] */
1452 item->ri_buf[item->ri_cnt].i_addr = ptr;
1453 item->ri_buf[item->ri_cnt].i_len = len;
1454 item->ri_cnt++;
1455 return 0;
1456}
1457
1458STATIC void
1459xlog_recover_new_tid(
1460 xlog_recover_t **q,
1461 xlog_tid_t tid,
1462 xfs_lsn_t lsn)
1463{
1464 xlog_recover_t *trans;
1465
1466 trans = kmem_zalloc(sizeof(xlog_recover_t), KM_SLEEP);
1467 trans->r_log_tid = tid;
1468 trans->r_lsn = lsn;
1469 xlog_recover_put_hashq(q, trans);
1470}
1471
1472STATIC int
1473xlog_recover_unlink_tid(
1474 xlog_recover_t **q,
1475 xlog_recover_t *trans)
1476{
1477 xlog_recover_t *tp;
1478 int found = 0;
1479
Christoph Hellwig4b809162007-08-16 15:37:36 +10001480 ASSERT(trans != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 if (trans == *q) {
1482 *q = (*q)->r_next;
1483 } else {
1484 tp = *q;
Christoph Hellwig4b809162007-08-16 15:37:36 +10001485 while (tp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 if (tp->r_next == trans) {
1487 found = 1;
1488 break;
1489 }
1490 tp = tp->r_next;
1491 }
1492 if (!found) {
1493 xlog_warn(
1494 "XFS: xlog_recover_unlink_tid: trans not found");
1495 ASSERT(0);
1496 return XFS_ERROR(EIO);
1497 }
1498 tp->r_next = tp->r_next->r_next;
1499 }
1500 return 0;
1501}
1502
1503STATIC void
1504xlog_recover_insert_item_backq(
1505 xlog_recover_item_t **q,
1506 xlog_recover_item_t *item)
1507{
Christoph Hellwig4b809162007-08-16 15:37:36 +10001508 if (*q == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 item->ri_prev = item->ri_next = item;
1510 *q = item;
1511 } else {
1512 item->ri_next = *q;
1513 item->ri_prev = (*q)->ri_prev;
1514 (*q)->ri_prev = item;
1515 item->ri_prev->ri_next = item;
1516 }
1517}
1518
1519STATIC void
1520xlog_recover_insert_item_frontq(
1521 xlog_recover_item_t **q,
1522 xlog_recover_item_t *item)
1523{
1524 xlog_recover_insert_item_backq(q, item);
1525 *q = item;
1526}
1527
1528STATIC int
1529xlog_recover_reorder_trans(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 xlog_recover_t *trans)
1531{
1532 xlog_recover_item_t *first_item, *itemq, *itemq_next;
1533 xfs_buf_log_format_t *buf_f;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 ushort flags = 0;
1535
1536 first_item = itemq = trans->r_itemq;
1537 trans->r_itemq = NULL;
1538 do {
1539 itemq_next = itemq->ri_next;
1540 buf_f = (xfs_buf_log_format_t *)itemq->ri_buf[0].i_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541
1542 switch (ITEM_TYPE(itemq)) {
1543 case XFS_LI_BUF:
Eric Sandeen804195b2007-02-10 18:35:02 +11001544 flags = buf_f->blf_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 if (!(flags & XFS_BLI_CANCEL)) {
1546 xlog_recover_insert_item_frontq(&trans->r_itemq,
1547 itemq);
1548 break;
1549 }
1550 case XFS_LI_INODE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 case XFS_LI_DQUOT:
1552 case XFS_LI_QUOTAOFF:
1553 case XFS_LI_EFD:
1554 case XFS_LI_EFI:
1555 xlog_recover_insert_item_backq(&trans->r_itemq, itemq);
1556 break;
1557 default:
1558 xlog_warn(
1559 "XFS: xlog_recover_reorder_trans: unrecognized type of log operation");
1560 ASSERT(0);
1561 return XFS_ERROR(EIO);
1562 }
1563 itemq = itemq_next;
1564 } while (first_item != itemq);
1565 return 0;
1566}
1567
1568/*
1569 * Build up the table of buf cancel records so that we don't replay
1570 * cancelled data in the second pass. For buffer records that are
1571 * not cancel records, there is nothing to do here so we just return.
1572 *
1573 * If we get a cancel record which is already in the table, this indicates
1574 * that the buffer was cancelled multiple times. In order to ensure
1575 * that during pass 2 we keep the record in the table until we reach its
1576 * last occurrence in the log, we keep a reference count in the cancel
1577 * record in the table to tell us how many times we expect to see this
1578 * record during the second pass.
1579 */
1580STATIC void
1581xlog_recover_do_buffer_pass1(
1582 xlog_t *log,
1583 xfs_buf_log_format_t *buf_f)
1584{
1585 xfs_buf_cancel_t *bcp;
1586 xfs_buf_cancel_t *nextp;
1587 xfs_buf_cancel_t *prevp;
1588 xfs_buf_cancel_t **bucket;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 xfs_daddr_t blkno = 0;
1590 uint len = 0;
1591 ushort flags = 0;
1592
1593 switch (buf_f->blf_type) {
1594 case XFS_LI_BUF:
1595 blkno = buf_f->blf_blkno;
1596 len = buf_f->blf_len;
1597 flags = buf_f->blf_flags;
1598 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 }
1600
1601 /*
1602 * If this isn't a cancel buffer item, then just return.
1603 */
1604 if (!(flags & XFS_BLI_CANCEL))
1605 return;
1606
1607 /*
1608 * Insert an xfs_buf_cancel record into the hash table of
1609 * them. If there is already an identical record, bump
1610 * its reference count.
1611 */
1612 bucket = &log->l_buf_cancel_table[(__uint64_t)blkno %
1613 XLOG_BC_TABLE_SIZE];
1614 /*
1615 * If the hash bucket is empty then just insert a new record into
1616 * the bucket.
1617 */
1618 if (*bucket == NULL) {
1619 bcp = (xfs_buf_cancel_t *)kmem_alloc(sizeof(xfs_buf_cancel_t),
1620 KM_SLEEP);
1621 bcp->bc_blkno = blkno;
1622 bcp->bc_len = len;
1623 bcp->bc_refcount = 1;
1624 bcp->bc_next = NULL;
1625 *bucket = bcp;
1626 return;
1627 }
1628
1629 /*
1630 * The hash bucket is not empty, so search for duplicates of our
1631 * record. If we find one them just bump its refcount. If not
1632 * then add us at the end of the list.
1633 */
1634 prevp = NULL;
1635 nextp = *bucket;
1636 while (nextp != NULL) {
1637 if (nextp->bc_blkno == blkno && nextp->bc_len == len) {
1638 nextp->bc_refcount++;
1639 return;
1640 }
1641 prevp = nextp;
1642 nextp = nextp->bc_next;
1643 }
1644 ASSERT(prevp != NULL);
1645 bcp = (xfs_buf_cancel_t *)kmem_alloc(sizeof(xfs_buf_cancel_t),
1646 KM_SLEEP);
1647 bcp->bc_blkno = blkno;
1648 bcp->bc_len = len;
1649 bcp->bc_refcount = 1;
1650 bcp->bc_next = NULL;
1651 prevp->bc_next = bcp;
1652}
1653
1654/*
1655 * Check to see whether the buffer being recovered has a corresponding
1656 * entry in the buffer cancel record table. If it does then return 1
1657 * so that it will be cancelled, otherwise return 0. If the buffer is
1658 * actually a buffer cancel item (XFS_BLI_CANCEL is set), then decrement
1659 * the refcount on the entry in the table and remove it from the table
1660 * if this is the last reference.
1661 *
1662 * We remove the cancel record from the table when we encounter its
1663 * last occurrence in the log so that if the same buffer is re-used
1664 * again after its last cancellation we actually replay the changes
1665 * made at that point.
1666 */
1667STATIC int
1668xlog_check_buffer_cancelled(
1669 xlog_t *log,
1670 xfs_daddr_t blkno,
1671 uint len,
1672 ushort flags)
1673{
1674 xfs_buf_cancel_t *bcp;
1675 xfs_buf_cancel_t *prevp;
1676 xfs_buf_cancel_t **bucket;
1677
1678 if (log->l_buf_cancel_table == NULL) {
1679 /*
1680 * There is nothing in the table built in pass one,
1681 * so this buffer must not be cancelled.
1682 */
1683 ASSERT(!(flags & XFS_BLI_CANCEL));
1684 return 0;
1685 }
1686
1687 bucket = &log->l_buf_cancel_table[(__uint64_t)blkno %
1688 XLOG_BC_TABLE_SIZE];
1689 bcp = *bucket;
1690 if (bcp == NULL) {
1691 /*
1692 * There is no corresponding entry in the table built
1693 * in pass one, so this buffer has not been cancelled.
1694 */
1695 ASSERT(!(flags & XFS_BLI_CANCEL));
1696 return 0;
1697 }
1698
1699 /*
1700 * Search for an entry in the buffer cancel table that
1701 * matches our buffer.
1702 */
1703 prevp = NULL;
1704 while (bcp != NULL) {
1705 if (bcp->bc_blkno == blkno && bcp->bc_len == len) {
1706 /*
1707 * We've go a match, so return 1 so that the
1708 * recovery of this buffer is cancelled.
1709 * If this buffer is actually a buffer cancel
1710 * log item, then decrement the refcount on the
1711 * one in the table and remove it if this is the
1712 * last reference.
1713 */
1714 if (flags & XFS_BLI_CANCEL) {
1715 bcp->bc_refcount--;
1716 if (bcp->bc_refcount == 0) {
1717 if (prevp == NULL) {
1718 *bucket = bcp->bc_next;
1719 } else {
1720 prevp->bc_next = bcp->bc_next;
1721 }
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10001722 kmem_free(bcp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 }
1724 }
1725 return 1;
1726 }
1727 prevp = bcp;
1728 bcp = bcp->bc_next;
1729 }
1730 /*
1731 * We didn't find a corresponding entry in the table, so
1732 * return 0 so that the buffer is NOT cancelled.
1733 */
1734 ASSERT(!(flags & XFS_BLI_CANCEL));
1735 return 0;
1736}
1737
1738STATIC int
1739xlog_recover_do_buffer_pass2(
1740 xlog_t *log,
1741 xfs_buf_log_format_t *buf_f)
1742{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 xfs_daddr_t blkno = 0;
1744 ushort flags = 0;
1745 uint len = 0;
1746
1747 switch (buf_f->blf_type) {
1748 case XFS_LI_BUF:
1749 blkno = buf_f->blf_blkno;
1750 flags = buf_f->blf_flags;
1751 len = buf_f->blf_len;
1752 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 }
1754
1755 return xlog_check_buffer_cancelled(log, blkno, len, flags);
1756}
1757
1758/*
1759 * Perform recovery for a buffer full of inodes. In these buffers,
1760 * the only data which should be recovered is that which corresponds
1761 * to the di_next_unlinked pointers in the on disk inode structures.
1762 * The rest of the data for the inodes is always logged through the
1763 * inodes themselves rather than the inode buffer and is recovered
1764 * in xlog_recover_do_inode_trans().
1765 *
1766 * The only time when buffers full of inodes are fully recovered is
1767 * when the buffer is full of newly allocated inodes. In this case
1768 * the buffer will not be marked as an inode buffer and so will be
1769 * sent to xlog_recover_do_reg_buffer() below during recovery.
1770 */
1771STATIC int
1772xlog_recover_do_inode_buffer(
1773 xfs_mount_t *mp,
1774 xlog_recover_item_t *item,
1775 xfs_buf_t *bp,
1776 xfs_buf_log_format_t *buf_f)
1777{
1778 int i;
1779 int item_index;
1780 int bit;
1781 int nbits;
1782 int reg_buf_offset;
1783 int reg_buf_bytes;
1784 int next_unlinked_offset;
1785 int inodes_per_buf;
1786 xfs_agino_t *logged_nextp;
1787 xfs_agino_t *buffer_nextp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 unsigned int *data_map = NULL;
1789 unsigned int map_size = 0;
1790
1791 switch (buf_f->blf_type) {
1792 case XFS_LI_BUF:
1793 data_map = buf_f->blf_data_map;
1794 map_size = buf_f->blf_map_size;
1795 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 }
1797 /*
1798 * Set the variables corresponding to the current region to
1799 * 0 so that we'll initialize them on the first pass through
1800 * the loop.
1801 */
1802 reg_buf_offset = 0;
1803 reg_buf_bytes = 0;
1804 bit = 0;
1805 nbits = 0;
1806 item_index = 0;
1807 inodes_per_buf = XFS_BUF_COUNT(bp) >> mp->m_sb.sb_inodelog;
1808 for (i = 0; i < inodes_per_buf; i++) {
1809 next_unlinked_offset = (i * mp->m_sb.sb_inodesize) +
1810 offsetof(xfs_dinode_t, di_next_unlinked);
1811
1812 while (next_unlinked_offset >=
1813 (reg_buf_offset + reg_buf_bytes)) {
1814 /*
1815 * The next di_next_unlinked field is beyond
1816 * the current logged region. Find the next
1817 * logged region that contains or is beyond
1818 * the current di_next_unlinked field.
1819 */
1820 bit += nbits;
1821 bit = xfs_next_bit(data_map, map_size, bit);
1822
1823 /*
1824 * If there are no more logged regions in the
1825 * buffer, then we're done.
1826 */
1827 if (bit == -1) {
1828 return 0;
1829 }
1830
1831 nbits = xfs_contig_bits(data_map, map_size,
1832 bit);
1833 ASSERT(nbits > 0);
1834 reg_buf_offset = bit << XFS_BLI_SHIFT;
1835 reg_buf_bytes = nbits << XFS_BLI_SHIFT;
1836 item_index++;
1837 }
1838
1839 /*
1840 * If the current logged region starts after the current
1841 * di_next_unlinked field, then move on to the next
1842 * di_next_unlinked field.
1843 */
1844 if (next_unlinked_offset < reg_buf_offset) {
1845 continue;
1846 }
1847
1848 ASSERT(item->ri_buf[item_index].i_addr != NULL);
1849 ASSERT((item->ri_buf[item_index].i_len % XFS_BLI_CHUNK) == 0);
1850 ASSERT((reg_buf_offset + reg_buf_bytes) <= XFS_BUF_COUNT(bp));
1851
1852 /*
1853 * The current logged region contains a copy of the
1854 * current di_next_unlinked field. Extract its value
1855 * and copy it to the buffer copy.
1856 */
1857 logged_nextp = (xfs_agino_t *)
1858 ((char *)(item->ri_buf[item_index].i_addr) +
1859 (next_unlinked_offset - reg_buf_offset));
1860 if (unlikely(*logged_nextp == 0)) {
1861 xfs_fs_cmn_err(CE_ALERT, mp,
1862 "bad inode buffer log record (ptr = 0x%p, bp = 0x%p). XFS trying to replay bad (0) inode di_next_unlinked field",
1863 item, bp);
1864 XFS_ERROR_REPORT("xlog_recover_do_inode_buf",
1865 XFS_ERRLEVEL_LOW, mp);
1866 return XFS_ERROR(EFSCORRUPTED);
1867 }
1868
1869 buffer_nextp = (xfs_agino_t *)xfs_buf_offset(bp,
1870 next_unlinked_offset);
Tim Shimmin87c199c2006-06-09 14:56:16 +10001871 *buffer_nextp = *logged_nextp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 }
1873
1874 return 0;
1875}
1876
1877/*
1878 * Perform a 'normal' buffer recovery. Each logged region of the
1879 * buffer should be copied over the corresponding region in the
1880 * given buffer. The bitmap in the buf log format structure indicates
1881 * where to place the logged data.
1882 */
1883/*ARGSUSED*/
1884STATIC void
1885xlog_recover_do_reg_buffer(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 xlog_recover_item_t *item,
1887 xfs_buf_t *bp,
1888 xfs_buf_log_format_t *buf_f)
1889{
1890 int i;
1891 int bit;
1892 int nbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 unsigned int *data_map = NULL;
1894 unsigned int map_size = 0;
1895 int error;
1896
1897 switch (buf_f->blf_type) {
1898 case XFS_LI_BUF:
1899 data_map = buf_f->blf_data_map;
1900 map_size = buf_f->blf_map_size;
1901 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 }
1903 bit = 0;
1904 i = 1; /* 0 is the buf format structure */
1905 while (1) {
1906 bit = xfs_next_bit(data_map, map_size, bit);
1907 if (bit == -1)
1908 break;
1909 nbits = xfs_contig_bits(data_map, map_size, bit);
1910 ASSERT(nbits > 0);
Christoph Hellwig4b809162007-08-16 15:37:36 +10001911 ASSERT(item->ri_buf[i].i_addr != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 ASSERT(item->ri_buf[i].i_len % XFS_BLI_CHUNK == 0);
1913 ASSERT(XFS_BUF_COUNT(bp) >=
1914 ((uint)bit << XFS_BLI_SHIFT)+(nbits<<XFS_BLI_SHIFT));
1915
1916 /*
1917 * Do a sanity check if this is a dquot buffer. Just checking
1918 * the first dquot in the buffer should do. XXXThis is
1919 * probably a good thing to do for other buf types also.
1920 */
1921 error = 0;
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001922 if (buf_f->blf_flags &
1923 (XFS_BLI_UDQUOT_BUF|XFS_BLI_PDQUOT_BUF|XFS_BLI_GDQUOT_BUF)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 error = xfs_qm_dqcheck((xfs_disk_dquot_t *)
1925 item->ri_buf[i].i_addr,
1926 -1, 0, XFS_QMOPT_DOWARN,
1927 "dquot_buf_recover");
1928 }
Tim Shimmin053c59a2007-10-01 16:39:37 +10001929 if (!error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 memcpy(xfs_buf_offset(bp,
1931 (uint)bit << XFS_BLI_SHIFT), /* dest */
1932 item->ri_buf[i].i_addr, /* source */
1933 nbits<<XFS_BLI_SHIFT); /* length */
1934 i++;
1935 bit += nbits;
1936 }
1937
1938 /* Shouldn't be any more regions */
1939 ASSERT(i == item->ri_total);
1940}
1941
1942/*
1943 * Do some primitive error checking on ondisk dquot data structures.
1944 */
1945int
1946xfs_qm_dqcheck(
1947 xfs_disk_dquot_t *ddq,
1948 xfs_dqid_t id,
1949 uint type, /* used only when IO_dorepair is true */
1950 uint flags,
1951 char *str)
1952{
1953 xfs_dqblk_t *d = (xfs_dqblk_t *)ddq;
1954 int errs = 0;
1955
1956 /*
1957 * We can encounter an uninitialized dquot buffer for 2 reasons:
1958 * 1. If we crash while deleting the quotainode(s), and those blks got
1959 * used for user data. This is because we take the path of regular
1960 * file deletion; however, the size field of quotainodes is never
1961 * updated, so all the tricks that we play in itruncate_finish
1962 * don't quite matter.
1963 *
1964 * 2. We don't play the quota buffers when there's a quotaoff logitem.
1965 * But the allocation will be replayed so we'll end up with an
1966 * uninitialized quota block.
1967 *
1968 * This is all fine; things are still consistent, and we haven't lost
1969 * any quota information. Just don't complain about bad dquot blks.
1970 */
Christoph Hellwig1149d962005-11-02 15:01:12 +11001971 if (be16_to_cpu(ddq->d_magic) != XFS_DQUOT_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 if (flags & XFS_QMOPT_DOWARN)
1973 cmn_err(CE_ALERT,
1974 "%s : XFS dquot ID 0x%x, magic 0x%x != 0x%x",
Christoph Hellwig1149d962005-11-02 15:01:12 +11001975 str, id, be16_to_cpu(ddq->d_magic), XFS_DQUOT_MAGIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 errs++;
1977 }
Christoph Hellwig1149d962005-11-02 15:01:12 +11001978 if (ddq->d_version != XFS_DQUOT_VERSION) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 if (flags & XFS_QMOPT_DOWARN)
1980 cmn_err(CE_ALERT,
1981 "%s : XFS dquot ID 0x%x, version 0x%x != 0x%x",
Christoph Hellwig1149d962005-11-02 15:01:12 +11001982 str, id, ddq->d_version, XFS_DQUOT_VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 errs++;
1984 }
1985
Christoph Hellwig1149d962005-11-02 15:01:12 +11001986 if (ddq->d_flags != XFS_DQ_USER &&
1987 ddq->d_flags != XFS_DQ_PROJ &&
1988 ddq->d_flags != XFS_DQ_GROUP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 if (flags & XFS_QMOPT_DOWARN)
1990 cmn_err(CE_ALERT,
1991 "%s : XFS dquot ID 0x%x, unknown flags 0x%x",
Christoph Hellwig1149d962005-11-02 15:01:12 +11001992 str, id, ddq->d_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 errs++;
1994 }
1995
Christoph Hellwig1149d962005-11-02 15:01:12 +11001996 if (id != -1 && id != be32_to_cpu(ddq->d_id)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 if (flags & XFS_QMOPT_DOWARN)
1998 cmn_err(CE_ALERT,
1999 "%s : ondisk-dquot 0x%p, ID mismatch: "
2000 "0x%x expected, found id 0x%x",
Christoph Hellwig1149d962005-11-02 15:01:12 +11002001 str, ddq, id, be32_to_cpu(ddq->d_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002 errs++;
2003 }
2004
2005 if (!errs && ddq->d_id) {
Christoph Hellwig1149d962005-11-02 15:01:12 +11002006 if (ddq->d_blk_softlimit &&
2007 be64_to_cpu(ddq->d_bcount) >=
2008 be64_to_cpu(ddq->d_blk_softlimit)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009 if (!ddq->d_btimer) {
2010 if (flags & XFS_QMOPT_DOWARN)
2011 cmn_err(CE_ALERT,
2012 "%s : Dquot ID 0x%x (0x%p) "
2013 "BLK TIMER NOT STARTED",
Christoph Hellwig1149d962005-11-02 15:01:12 +11002014 str, (int)be32_to_cpu(ddq->d_id), ddq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015 errs++;
2016 }
2017 }
Christoph Hellwig1149d962005-11-02 15:01:12 +11002018 if (ddq->d_ino_softlimit &&
2019 be64_to_cpu(ddq->d_icount) >=
2020 be64_to_cpu(ddq->d_ino_softlimit)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 if (!ddq->d_itimer) {
2022 if (flags & XFS_QMOPT_DOWARN)
2023 cmn_err(CE_ALERT,
2024 "%s : Dquot ID 0x%x (0x%p) "
2025 "INODE TIMER NOT STARTED",
Christoph Hellwig1149d962005-11-02 15:01:12 +11002026 str, (int)be32_to_cpu(ddq->d_id), ddq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027 errs++;
2028 }
2029 }
Christoph Hellwig1149d962005-11-02 15:01:12 +11002030 if (ddq->d_rtb_softlimit &&
2031 be64_to_cpu(ddq->d_rtbcount) >=
2032 be64_to_cpu(ddq->d_rtb_softlimit)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033 if (!ddq->d_rtbtimer) {
2034 if (flags & XFS_QMOPT_DOWARN)
2035 cmn_err(CE_ALERT,
2036 "%s : Dquot ID 0x%x (0x%p) "
2037 "RTBLK TIMER NOT STARTED",
Christoph Hellwig1149d962005-11-02 15:01:12 +11002038 str, (int)be32_to_cpu(ddq->d_id), ddq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039 errs++;
2040 }
2041 }
2042 }
2043
2044 if (!errs || !(flags & XFS_QMOPT_DQREPAIR))
2045 return errs;
2046
2047 if (flags & XFS_QMOPT_DOWARN)
2048 cmn_err(CE_NOTE, "Re-initializing dquot ID 0x%x", id);
2049
2050 /*
2051 * Typically, a repair is only requested by quotacheck.
2052 */
2053 ASSERT(id != -1);
2054 ASSERT(flags & XFS_QMOPT_DQREPAIR);
2055 memset(d, 0, sizeof(xfs_dqblk_t));
Christoph Hellwig1149d962005-11-02 15:01:12 +11002056
2057 d->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
2058 d->dd_diskdq.d_version = XFS_DQUOT_VERSION;
2059 d->dd_diskdq.d_flags = type;
2060 d->dd_diskdq.d_id = cpu_to_be32(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002061
2062 return errs;
2063}
2064
2065/*
2066 * Perform a dquot buffer recovery.
2067 * Simple algorithm: if we have found a QUOTAOFF logitem of the same type
2068 * (ie. USR or GRP), then just toss this buffer away; don't recover it.
2069 * Else, treat it as a regular buffer and do recovery.
2070 */
2071STATIC void
2072xlog_recover_do_dquot_buffer(
2073 xfs_mount_t *mp,
2074 xlog_t *log,
2075 xlog_recover_item_t *item,
2076 xfs_buf_t *bp,
2077 xfs_buf_log_format_t *buf_f)
2078{
2079 uint type;
2080
2081 /*
2082 * Filesystems are required to send in quota flags at mount time.
2083 */
2084 if (mp->m_qflags == 0) {
2085 return;
2086 }
2087
2088 type = 0;
2089 if (buf_f->blf_flags & XFS_BLI_UDQUOT_BUF)
2090 type |= XFS_DQ_USER;
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002091 if (buf_f->blf_flags & XFS_BLI_PDQUOT_BUF)
2092 type |= XFS_DQ_PROJ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093 if (buf_f->blf_flags & XFS_BLI_GDQUOT_BUF)
2094 type |= XFS_DQ_GROUP;
2095 /*
2096 * This type of quotas was turned off, so ignore this buffer
2097 */
2098 if (log->l_quotaoffs_flag & type)
2099 return;
2100
Tim Shimmin053c59a2007-10-01 16:39:37 +10002101 xlog_recover_do_reg_buffer(item, bp, buf_f);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102}
2103
2104/*
2105 * This routine replays a modification made to a buffer at runtime.
2106 * There are actually two types of buffer, regular and inode, which
2107 * are handled differently. Inode buffers are handled differently
2108 * in that we only recover a specific set of data from them, namely
2109 * the inode di_next_unlinked fields. This is because all other inode
2110 * data is actually logged via inode records and any data we replay
2111 * here which overlaps that may be stale.
2112 *
2113 * When meta-data buffers are freed at run time we log a buffer item
2114 * with the XFS_BLI_CANCEL bit set to indicate that previous copies
2115 * of the buffer in the log should not be replayed at recovery time.
2116 * This is so that if the blocks covered by the buffer are reused for
2117 * file data before we crash we don't end up replaying old, freed
2118 * meta-data into a user's file.
2119 *
2120 * To handle the cancellation of buffer log items, we make two passes
2121 * over the log during recovery. During the first we build a table of
2122 * those buffers which have been cancelled, and during the second we
2123 * only replay those buffers which do not have corresponding cancel
2124 * records in the table. See xlog_recover_do_buffer_pass[1,2] above
2125 * for more details on the implementation of the table of cancel records.
2126 */
2127STATIC int
2128xlog_recover_do_buffer_trans(
2129 xlog_t *log,
2130 xlog_recover_item_t *item,
2131 int pass)
2132{
2133 xfs_buf_log_format_t *buf_f;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134 xfs_mount_t *mp;
2135 xfs_buf_t *bp;
2136 int error;
2137 int cancel;
2138 xfs_daddr_t blkno;
2139 int len;
2140 ushort flags;
2141
2142 buf_f = (xfs_buf_log_format_t *)item->ri_buf[0].i_addr;
2143
2144 if (pass == XLOG_RECOVER_PASS1) {
2145 /*
2146 * In this pass we're only looking for buf items
2147 * with the XFS_BLI_CANCEL bit set.
2148 */
2149 xlog_recover_do_buffer_pass1(log, buf_f);
2150 return 0;
2151 } else {
2152 /*
2153 * In this pass we want to recover all the buffers
2154 * which have not been cancelled and are not
2155 * cancellation buffers themselves. The routine
2156 * we call here will tell us whether or not to
2157 * continue with the replay of this buffer.
2158 */
2159 cancel = xlog_recover_do_buffer_pass2(log, buf_f);
2160 if (cancel) {
2161 return 0;
2162 }
2163 }
2164 switch (buf_f->blf_type) {
2165 case XFS_LI_BUF:
2166 blkno = buf_f->blf_blkno;
2167 len = buf_f->blf_len;
2168 flags = buf_f->blf_flags;
2169 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170 default:
2171 xfs_fs_cmn_err(CE_ALERT, log->l_mp,
Nathan Scottfc1f8c12005-11-02 11:44:33 +11002172 "xfs_log_recover: unknown buffer type 0x%x, logdev %s",
2173 buf_f->blf_type, log->l_mp->m_logname ?
2174 log->l_mp->m_logname : "internal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 XFS_ERROR_REPORT("xlog_recover_do_buffer_trans",
2176 XFS_ERRLEVEL_LOW, log->l_mp);
2177 return XFS_ERROR(EFSCORRUPTED);
2178 }
2179
2180 mp = log->l_mp;
2181 if (flags & XFS_BLI_INODE_BUF) {
2182 bp = xfs_buf_read_flags(mp->m_ddev_targp, blkno, len,
2183 XFS_BUF_LOCK);
2184 } else {
2185 bp = xfs_buf_read(mp->m_ddev_targp, blkno, len, 0);
2186 }
2187 if (XFS_BUF_ISERROR(bp)) {
2188 xfs_ioerror_alert("xlog_recover_do..(read#1)", log->l_mp,
2189 bp, blkno);
2190 error = XFS_BUF_GETERROR(bp);
2191 xfs_buf_relse(bp);
2192 return error;
2193 }
2194
2195 error = 0;
2196 if (flags & XFS_BLI_INODE_BUF) {
2197 error = xlog_recover_do_inode_buffer(mp, item, bp, buf_f);
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002198 } else if (flags &
2199 (XFS_BLI_UDQUOT_BUF|XFS_BLI_PDQUOT_BUF|XFS_BLI_GDQUOT_BUF)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 xlog_recover_do_dquot_buffer(mp, log, item, bp, buf_f);
2201 } else {
Tim Shimmin053c59a2007-10-01 16:39:37 +10002202 xlog_recover_do_reg_buffer(item, bp, buf_f);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 }
2204 if (error)
2205 return XFS_ERROR(error);
2206
2207 /*
2208 * Perform delayed write on the buffer. Asynchronous writes will be
2209 * slower when taking into account all the buffers to be flushed.
2210 *
2211 * Also make sure that only inode buffers with good sizes stay in
2212 * the buffer cache. The kernel moves inodes in buffers of 1 block
2213 * or XFS_INODE_CLUSTER_SIZE bytes, whichever is bigger. The inode
2214 * buffers in the log can be a different size if the log was generated
2215 * by an older kernel using unclustered inode buffers or a newer kernel
2216 * running with a different inode cluster size. Regardless, if the
2217 * the inode buffer size isn't MAX(blocksize, XFS_INODE_CLUSTER_SIZE)
2218 * for *our* value of XFS_INODE_CLUSTER_SIZE, then we need to keep
2219 * the buffer out of the buffer cache so that the buffer won't
2220 * overlap with future reads of those inodes.
2221 */
2222 if (XFS_DINODE_MAGIC ==
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002223 be16_to_cpu(*((__be16 *)xfs_buf_offset(bp, 0))) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 (XFS_BUF_COUNT(bp) != MAX(log->l_mp->m_sb.sb_blocksize,
2225 (__uint32_t)XFS_INODE_CLUSTER_SIZE(log->l_mp)))) {
2226 XFS_BUF_STALE(bp);
2227 error = xfs_bwrite(mp, bp);
2228 } else {
2229 ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL ||
2230 XFS_BUF_FSPRIVATE(bp, xfs_mount_t *) == mp);
2231 XFS_BUF_SET_FSPRIVATE(bp, mp);
2232 XFS_BUF_SET_IODONE_FUNC(bp, xlog_recover_iodone);
2233 xfs_bdwrite(mp, bp);
2234 }
2235
2236 return (error);
2237}
2238
2239STATIC int
2240xlog_recover_do_inode_trans(
2241 xlog_t *log,
2242 xlog_recover_item_t *item,
2243 int pass)
2244{
2245 xfs_inode_log_format_t *in_f;
2246 xfs_mount_t *mp;
2247 xfs_buf_t *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 xfs_dinode_t *dip;
2249 xfs_ino_t ino;
2250 int len;
2251 xfs_caddr_t src;
2252 xfs_caddr_t dest;
2253 int error;
2254 int attr_index;
2255 uint fields;
Christoph Hellwig347d1c02007-08-28 13:57:51 +10002256 xfs_icdinode_t *dicp;
Tim Shimmin6d192a92006-06-09 14:55:38 +10002257 int need_free = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258
2259 if (pass == XLOG_RECOVER_PASS1) {
2260 return 0;
2261 }
2262
Tim Shimmin6d192a92006-06-09 14:55:38 +10002263 if (item->ri_buf[0].i_len == sizeof(xfs_inode_log_format_t)) {
2264 in_f = (xfs_inode_log_format_t *)item->ri_buf[0].i_addr;
2265 } else {
2266 in_f = (xfs_inode_log_format_t *)kmem_alloc(
2267 sizeof(xfs_inode_log_format_t), KM_SLEEP);
2268 need_free = 1;
2269 error = xfs_inode_item_format_convert(&item->ri_buf[0], in_f);
2270 if (error)
2271 goto error;
2272 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002273 ino = in_f->ilf_ino;
2274 mp = log->l_mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275
2276 /*
2277 * Inode buffers can be freed, look out for it,
2278 * and do not replay the inode.
2279 */
Christoph Hellwiga1941892008-11-28 14:23:40 +11002280 if (xlog_check_buffer_cancelled(log, in_f->ilf_blkno,
2281 in_f->ilf_len, 0)) {
Tim Shimmin6d192a92006-06-09 14:55:38 +10002282 error = 0;
2283 goto error;
2284 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285
Christoph Hellwiga1941892008-11-28 14:23:40 +11002286 bp = xfs_buf_read_flags(mp->m_ddev_targp, in_f->ilf_blkno,
2287 in_f->ilf_len, XFS_BUF_LOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288 if (XFS_BUF_ISERROR(bp)) {
2289 xfs_ioerror_alert("xlog_recover_do..(read#2)", mp,
Christoph Hellwiga1941892008-11-28 14:23:40 +11002290 bp, in_f->ilf_blkno);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291 error = XFS_BUF_GETERROR(bp);
2292 xfs_buf_relse(bp);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002293 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 }
2295 error = 0;
2296 ASSERT(in_f->ilf_fields & XFS_ILOG_CORE);
Christoph Hellwiga1941892008-11-28 14:23:40 +11002297 dip = (xfs_dinode_t *)xfs_buf_offset(bp, in_f->ilf_boffset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298
2299 /*
2300 * Make sure the place we're flushing out to really looks
2301 * like an inode!
2302 */
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002303 if (unlikely(be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002304 xfs_buf_relse(bp);
2305 xfs_fs_cmn_err(CE_ALERT, mp,
2306 "xfs_inode_recover: Bad inode magic number, dino ptr = 0x%p, dino bp = 0x%p, ino = %Ld",
2307 dip, bp, ino);
2308 XFS_ERROR_REPORT("xlog_recover_do_inode_trans(1)",
2309 XFS_ERRLEVEL_LOW, mp);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002310 error = EFSCORRUPTED;
2311 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 }
Christoph Hellwig347d1c02007-08-28 13:57:51 +10002313 dicp = (xfs_icdinode_t *)(item->ri_buf[1].i_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314 if (unlikely(dicp->di_magic != XFS_DINODE_MAGIC)) {
2315 xfs_buf_relse(bp);
2316 xfs_fs_cmn_err(CE_ALERT, mp,
2317 "xfs_inode_recover: Bad inode log record, rec ptr 0x%p, ino %Ld",
2318 item, ino);
2319 XFS_ERROR_REPORT("xlog_recover_do_inode_trans(2)",
2320 XFS_ERRLEVEL_LOW, mp);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002321 error = EFSCORRUPTED;
2322 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323 }
2324
2325 /* Skip replay when the on disk inode is newer than the log one */
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002326 if (dicp->di_flushiter < be16_to_cpu(dip->di_flushiter)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 /*
2328 * Deal with the wrap case, DI_MAX_FLUSH is less
2329 * than smaller numbers
2330 */
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002331 if (be16_to_cpu(dip->di_flushiter) == DI_MAX_FLUSH &&
Christoph Hellwig347d1c02007-08-28 13:57:51 +10002332 dicp->di_flushiter < (DI_MAX_FLUSH >> 1)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333 /* do nothing */
2334 } else {
2335 xfs_buf_relse(bp);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002336 error = 0;
2337 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338 }
2339 }
2340 /* Take the opportunity to reset the flush iteration count */
2341 dicp->di_flushiter = 0;
2342
2343 if (unlikely((dicp->di_mode & S_IFMT) == S_IFREG)) {
2344 if ((dicp->di_format != XFS_DINODE_FMT_EXTENTS) &&
2345 (dicp->di_format != XFS_DINODE_FMT_BTREE)) {
2346 XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(3)",
2347 XFS_ERRLEVEL_LOW, mp, dicp);
2348 xfs_buf_relse(bp);
2349 xfs_fs_cmn_err(CE_ALERT, mp,
2350 "xfs_inode_recover: Bad regular inode log record, rec ptr 0x%p, ino ptr = 0x%p, ino bp = 0x%p, ino %Ld",
2351 item, dip, bp, ino);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002352 error = EFSCORRUPTED;
2353 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354 }
2355 } else if (unlikely((dicp->di_mode & S_IFMT) == S_IFDIR)) {
2356 if ((dicp->di_format != XFS_DINODE_FMT_EXTENTS) &&
2357 (dicp->di_format != XFS_DINODE_FMT_BTREE) &&
2358 (dicp->di_format != XFS_DINODE_FMT_LOCAL)) {
2359 XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(4)",
2360 XFS_ERRLEVEL_LOW, mp, dicp);
2361 xfs_buf_relse(bp);
2362 xfs_fs_cmn_err(CE_ALERT, mp,
2363 "xfs_inode_recover: Bad dir inode log record, rec ptr 0x%p, ino ptr = 0x%p, ino bp = 0x%p, ino %Ld",
2364 item, dip, bp, ino);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002365 error = EFSCORRUPTED;
2366 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 }
2368 }
2369 if (unlikely(dicp->di_nextents + dicp->di_anextents > dicp->di_nblocks)){
2370 XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(5)",
2371 XFS_ERRLEVEL_LOW, mp, dicp);
2372 xfs_buf_relse(bp);
2373 xfs_fs_cmn_err(CE_ALERT, mp,
2374 "xfs_inode_recover: Bad inode log record, rec ptr 0x%p, dino ptr 0x%p, dino bp 0x%p, ino %Ld, total extents = %d, nblocks = %Ld",
2375 item, dip, bp, ino,
2376 dicp->di_nextents + dicp->di_anextents,
2377 dicp->di_nblocks);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002378 error = EFSCORRUPTED;
2379 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 }
2381 if (unlikely(dicp->di_forkoff > mp->m_sb.sb_inodesize)) {
2382 XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(6)",
2383 XFS_ERRLEVEL_LOW, mp, dicp);
2384 xfs_buf_relse(bp);
2385 xfs_fs_cmn_err(CE_ALERT, mp,
2386 "xfs_inode_recover: Bad inode log rec ptr 0x%p, dino ptr 0x%p, dino bp 0x%p, ino %Ld, forkoff 0x%x",
2387 item, dip, bp, ino, dicp->di_forkoff);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002388 error = EFSCORRUPTED;
2389 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 }
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002391 if (unlikely(item->ri_buf[1].i_len > sizeof(struct xfs_icdinode))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 XFS_CORRUPTION_ERROR("xlog_recover_do_inode_trans(7)",
2393 XFS_ERRLEVEL_LOW, mp, dicp);
2394 xfs_buf_relse(bp);
2395 xfs_fs_cmn_err(CE_ALERT, mp,
2396 "xfs_inode_recover: Bad inode log record length %d, rec ptr 0x%p",
2397 item->ri_buf[1].i_len, item);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002398 error = EFSCORRUPTED;
2399 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400 }
2401
2402 /* The core is in in-core format */
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002403 xfs_dinode_to_disk(dip, (xfs_icdinode_t *)item->ri_buf[1].i_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404
2405 /* the rest is in on-disk format */
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002406 if (item->ri_buf[1].i_len > sizeof(struct xfs_icdinode)) {
2407 memcpy((xfs_caddr_t) dip + sizeof(struct xfs_icdinode),
2408 item->ri_buf[1].i_addr + sizeof(struct xfs_icdinode),
2409 item->ri_buf[1].i_len - sizeof(struct xfs_icdinode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002410 }
2411
2412 fields = in_f->ilf_fields;
2413 switch (fields & (XFS_ILOG_DEV | XFS_ILOG_UUID)) {
2414 case XFS_ILOG_DEV:
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002415 xfs_dinode_put_rdev(dip, in_f->ilf_u.ilfu_rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002416 break;
2417 case XFS_ILOG_UUID:
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002418 memcpy(XFS_DFORK_DPTR(dip),
2419 &in_f->ilf_u.ilfu_uuid,
2420 sizeof(uuid_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421 break;
2422 }
2423
2424 if (in_f->ilf_size == 2)
2425 goto write_inode_buffer;
2426 len = item->ri_buf[2].i_len;
2427 src = item->ri_buf[2].i_addr;
2428 ASSERT(in_f->ilf_size <= 4);
2429 ASSERT((in_f->ilf_size == 3) || (fields & XFS_ILOG_AFORK));
2430 ASSERT(!(fields & XFS_ILOG_DFORK) ||
2431 (len == in_f->ilf_dsize));
2432
2433 switch (fields & XFS_ILOG_DFORK) {
2434 case XFS_ILOG_DDATA:
2435 case XFS_ILOG_DEXT:
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002436 memcpy(XFS_DFORK_DPTR(dip), src, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437 break;
2438
2439 case XFS_ILOG_DBROOT:
Christoph Hellwig7cc95a82008-10-30 17:14:34 +11002440 xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src, len,
Christoph Hellwig81591fe2008-11-28 14:23:39 +11002441 (xfs_bmdr_block_t *)XFS_DFORK_DPTR(dip),
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442 XFS_DFORK_DSIZE(dip, mp));
2443 break;
2444
2445 default:
2446 /*
2447 * There are no data fork flags set.
2448 */
2449 ASSERT((fields & XFS_ILOG_DFORK) == 0);
2450 break;
2451 }
2452
2453 /*
2454 * If we logged any attribute data, recover it. There may or
2455 * may not have been any other non-core data logged in this
2456 * transaction.
2457 */
2458 if (in_f->ilf_fields & XFS_ILOG_AFORK) {
2459 if (in_f->ilf_fields & XFS_ILOG_DFORK) {
2460 attr_index = 3;
2461 } else {
2462 attr_index = 2;
2463 }
2464 len = item->ri_buf[attr_index].i_len;
2465 src = item->ri_buf[attr_index].i_addr;
2466 ASSERT(len == in_f->ilf_asize);
2467
2468 switch (in_f->ilf_fields & XFS_ILOG_AFORK) {
2469 case XFS_ILOG_ADATA:
2470 case XFS_ILOG_AEXT:
2471 dest = XFS_DFORK_APTR(dip);
2472 ASSERT(len <= XFS_DFORK_ASIZE(dip, mp));
2473 memcpy(dest, src, len);
2474 break;
2475
2476 case XFS_ILOG_ABROOT:
2477 dest = XFS_DFORK_APTR(dip);
Christoph Hellwig7cc95a82008-10-30 17:14:34 +11002478 xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src,
2479 len, (xfs_bmdr_block_t*)dest,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480 XFS_DFORK_ASIZE(dip, mp));
2481 break;
2482
2483 default:
2484 xlog_warn("XFS: xlog_recover_do_inode_trans: Invalid flag");
2485 ASSERT(0);
2486 xfs_buf_relse(bp);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002487 error = EIO;
2488 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 }
2490 }
2491
2492write_inode_buffer:
2493 if (ITEM_TYPE(item) == XFS_LI_INODE) {
2494 ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL ||
2495 XFS_BUF_FSPRIVATE(bp, xfs_mount_t *) == mp);
2496 XFS_BUF_SET_FSPRIVATE(bp, mp);
2497 XFS_BUF_SET_IODONE_FUNC(bp, xlog_recover_iodone);
2498 xfs_bdwrite(mp, bp);
2499 } else {
2500 XFS_BUF_STALE(bp);
2501 error = xfs_bwrite(mp, bp);
2502 }
2503
Tim Shimmin6d192a92006-06-09 14:55:38 +10002504error:
2505 if (need_free)
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10002506 kmem_free(in_f);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002507 return XFS_ERROR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508}
2509
2510/*
2511 * Recover QUOTAOFF records. We simply make a note of it in the xlog_t
2512 * structure, so that we know not to do any dquot item or dquot buffer recovery,
2513 * of that type.
2514 */
2515STATIC int
2516xlog_recover_do_quotaoff_trans(
2517 xlog_t *log,
2518 xlog_recover_item_t *item,
2519 int pass)
2520{
2521 xfs_qoff_logformat_t *qoff_f;
2522
2523 if (pass == XLOG_RECOVER_PASS2) {
2524 return (0);
2525 }
2526
2527 qoff_f = (xfs_qoff_logformat_t *)item->ri_buf[0].i_addr;
2528 ASSERT(qoff_f);
2529
2530 /*
2531 * The logitem format's flag tells us if this was user quotaoff,
Nathan Scott77a7cce2006-01-11 15:35:57 +11002532 * group/project quotaoff or both.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002533 */
2534 if (qoff_f->qf_flags & XFS_UQUOTA_ACCT)
2535 log->l_quotaoffs_flag |= XFS_DQ_USER;
Nathan Scott77a7cce2006-01-11 15:35:57 +11002536 if (qoff_f->qf_flags & XFS_PQUOTA_ACCT)
2537 log->l_quotaoffs_flag |= XFS_DQ_PROJ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002538 if (qoff_f->qf_flags & XFS_GQUOTA_ACCT)
2539 log->l_quotaoffs_flag |= XFS_DQ_GROUP;
2540
2541 return (0);
2542}
2543
2544/*
2545 * Recover a dquot record
2546 */
2547STATIC int
2548xlog_recover_do_dquot_trans(
2549 xlog_t *log,
2550 xlog_recover_item_t *item,
2551 int pass)
2552{
2553 xfs_mount_t *mp;
2554 xfs_buf_t *bp;
2555 struct xfs_disk_dquot *ddq, *recddq;
2556 int error;
2557 xfs_dq_logformat_t *dq_f;
2558 uint type;
2559
2560 if (pass == XLOG_RECOVER_PASS1) {
2561 return 0;
2562 }
2563 mp = log->l_mp;
2564
2565 /*
2566 * Filesystems are required to send in quota flags at mount time.
2567 */
2568 if (mp->m_qflags == 0)
2569 return (0);
2570
2571 recddq = (xfs_disk_dquot_t *)item->ri_buf[1].i_addr;
2572 ASSERT(recddq);
2573 /*
2574 * This type of quotas was turned off, so ignore this record.
2575 */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002576 type = recddq->d_flags & (XFS_DQ_USER | XFS_DQ_PROJ | XFS_DQ_GROUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 ASSERT(type);
2578 if (log->l_quotaoffs_flag & type)
2579 return (0);
2580
2581 /*
2582 * At this point we know that quota was _not_ turned off.
2583 * Since the mount flags are not indicating to us otherwise, this
2584 * must mean that quota is on, and the dquot needs to be replayed.
2585 * Remember that we may not have fully recovered the superblock yet,
2586 * so we can't do the usual trick of looking at the SB quota bits.
2587 *
2588 * The other possibility, of course, is that the quota subsystem was
2589 * removed since the last mount - ENOSYS.
2590 */
2591 dq_f = (xfs_dq_logformat_t *)item->ri_buf[0].i_addr;
2592 ASSERT(dq_f);
2593 if ((error = xfs_qm_dqcheck(recddq,
2594 dq_f->qlf_id,
2595 0, XFS_QMOPT_DOWARN,
2596 "xlog_recover_do_dquot_trans (log copy)"))) {
2597 return XFS_ERROR(EIO);
2598 }
2599 ASSERT(dq_f->qlf_len == 1);
2600
2601 error = xfs_read_buf(mp, mp->m_ddev_targp,
2602 dq_f->qlf_blkno,
2603 XFS_FSB_TO_BB(mp, dq_f->qlf_len),
2604 0, &bp);
2605 if (error) {
2606 xfs_ioerror_alert("xlog_recover_do..(read#3)", mp,
2607 bp, dq_f->qlf_blkno);
2608 return error;
2609 }
2610 ASSERT(bp);
2611 ddq = (xfs_disk_dquot_t *)xfs_buf_offset(bp, dq_f->qlf_boffset);
2612
2613 /*
2614 * At least the magic num portion should be on disk because this
2615 * was among a chunk of dquots created earlier, and we did some
2616 * minimal initialization then.
2617 */
2618 if (xfs_qm_dqcheck(ddq, dq_f->qlf_id, 0, XFS_QMOPT_DOWARN,
2619 "xlog_recover_do_dquot_trans")) {
2620 xfs_buf_relse(bp);
2621 return XFS_ERROR(EIO);
2622 }
2623
2624 memcpy(ddq, recddq, item->ri_buf[1].i_len);
2625
2626 ASSERT(dq_f->qlf_size == 2);
2627 ASSERT(XFS_BUF_FSPRIVATE(bp, void *) == NULL ||
2628 XFS_BUF_FSPRIVATE(bp, xfs_mount_t *) == mp);
2629 XFS_BUF_SET_FSPRIVATE(bp, mp);
2630 XFS_BUF_SET_IODONE_FUNC(bp, xlog_recover_iodone);
2631 xfs_bdwrite(mp, bp);
2632
2633 return (0);
2634}
2635
2636/*
2637 * This routine is called to create an in-core extent free intent
2638 * item from the efi format structure which was logged on disk.
2639 * It allocates an in-core efi, copies the extents from the format
2640 * structure into it, and adds the efi to the AIL with the given
2641 * LSN.
2642 */
Tim Shimmin6d192a92006-06-09 14:55:38 +10002643STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644xlog_recover_do_efi_trans(
2645 xlog_t *log,
2646 xlog_recover_item_t *item,
2647 xfs_lsn_t lsn,
2648 int pass)
2649{
Tim Shimmin6d192a92006-06-09 14:55:38 +10002650 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 xfs_mount_t *mp;
2652 xfs_efi_log_item_t *efip;
2653 xfs_efi_log_format_t *efi_formatp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654
2655 if (pass == XLOG_RECOVER_PASS1) {
Tim Shimmin6d192a92006-06-09 14:55:38 +10002656 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657 }
2658
2659 efi_formatp = (xfs_efi_log_format_t *)item->ri_buf[0].i_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660
2661 mp = log->l_mp;
2662 efip = xfs_efi_init(mp, efi_formatp->efi_nextents);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002663 if ((error = xfs_efi_copy_format(&(item->ri_buf[0]),
2664 &(efip->efi_format)))) {
2665 xfs_efi_item_free(efip);
2666 return error;
2667 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668 efip->efi_next_extent = efi_formatp->efi_nextents;
2669 efip->efi_flags |= XFS_EFI_COMMITTED;
2670
David Chinnera9c21c12008-10-30 17:39:35 +11002671 spin_lock(&log->l_ailp->xa_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672 /*
David Chinner783a2f62008-10-30 17:39:58 +11002673 * xfs_trans_ail_update() drops the AIL lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 */
David Chinner783a2f62008-10-30 17:39:58 +11002675 xfs_trans_ail_update(log->l_ailp, (xfs_log_item_t *)efip, lsn);
Tim Shimmin6d192a92006-06-09 14:55:38 +10002676 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002677}
2678
2679
2680/*
2681 * This routine is called when an efd format structure is found in
2682 * a committed transaction in the log. It's purpose is to cancel
2683 * the corresponding efi if it was still in the log. To do this
2684 * it searches the AIL for the efi with an id equal to that in the
2685 * efd format structure. If we find it, we remove the efi from the
2686 * AIL and free it.
2687 */
2688STATIC void
2689xlog_recover_do_efd_trans(
2690 xlog_t *log,
2691 xlog_recover_item_t *item,
2692 int pass)
2693{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694 xfs_efd_log_format_t *efd_formatp;
2695 xfs_efi_log_item_t *efip = NULL;
2696 xfs_log_item_t *lip;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 __uint64_t efi_id;
David Chinner27d8d5f2008-10-30 17:38:39 +11002698 struct xfs_ail_cursor cur;
David Chinner783a2f62008-10-30 17:39:58 +11002699 struct xfs_ail *ailp = log->l_ailp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700
2701 if (pass == XLOG_RECOVER_PASS1) {
2702 return;
2703 }
2704
2705 efd_formatp = (xfs_efd_log_format_t *)item->ri_buf[0].i_addr;
Tim Shimmin6d192a92006-06-09 14:55:38 +10002706 ASSERT((item->ri_buf[0].i_len == (sizeof(xfs_efd_log_format_32_t) +
2707 ((efd_formatp->efd_nextents - 1) * sizeof(xfs_extent_32_t)))) ||
2708 (item->ri_buf[0].i_len == (sizeof(xfs_efd_log_format_64_t) +
2709 ((efd_formatp->efd_nextents - 1) * sizeof(xfs_extent_64_t)))));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710 efi_id = efd_formatp->efd_efi_id;
2711
2712 /*
2713 * Search for the efi with the id in the efd format structure
2714 * in the AIL.
2715 */
David Chinnera9c21c12008-10-30 17:39:35 +11002716 spin_lock(&ailp->xa_lock);
2717 lip = xfs_trans_ail_cursor_first(ailp, &cur, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718 while (lip != NULL) {
2719 if (lip->li_type == XFS_LI_EFI) {
2720 efip = (xfs_efi_log_item_t *)lip;
2721 if (efip->efi_format.efi_id == efi_id) {
2722 /*
David Chinner783a2f62008-10-30 17:39:58 +11002723 * xfs_trans_ail_delete() drops the
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724 * AIL lock.
2725 */
David Chinner783a2f62008-10-30 17:39:58 +11002726 xfs_trans_ail_delete(ailp, lip);
David Chinner8ae2c0f2007-11-23 16:28:17 +11002727 xfs_efi_item_free(efip);
David Chinnera9c21c12008-10-30 17:39:35 +11002728 spin_lock(&ailp->xa_lock);
David Chinner27d8d5f2008-10-30 17:38:39 +11002729 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002730 }
2731 }
David Chinnera9c21c12008-10-30 17:39:35 +11002732 lip = xfs_trans_ail_cursor_next(ailp, &cur);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002733 }
David Chinnera9c21c12008-10-30 17:39:35 +11002734 xfs_trans_ail_cursor_done(ailp, &cur);
2735 spin_unlock(&ailp->xa_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736}
2737
2738/*
2739 * Perform the transaction
2740 *
2741 * If the transaction modifies a buffer or inode, do it now. Otherwise,
2742 * EFIs and EFDs get queued up by adding entries into the AIL for them.
2743 */
2744STATIC int
2745xlog_recover_do_trans(
2746 xlog_t *log,
2747 xlog_recover_t *trans,
2748 int pass)
2749{
2750 int error = 0;
2751 xlog_recover_item_t *item, *first_item;
2752
Eric Sandeene9ed9d22007-05-08 13:48:56 +10002753 if ((error = xlog_recover_reorder_trans(trans)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002754 return error;
2755 first_item = item = trans->r_itemq;
2756 do {
2757 /*
2758 * we don't need to worry about the block number being
2759 * truncated in > 1 TB buffers because in user-land,
2760 * we're now n32 or 64-bit so xfs_daddr_t is 64-bits so
Nathan Scottc41564b2006-03-29 08:55:14 +10002761 * the blknos will get through the user-mode buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -07002762 * cache properly. The only bad case is o32 kernels
2763 * where xfs_daddr_t is 32-bits but mount will warn us
2764 * off a > 1 TB filesystem before we get here.
2765 */
Eric Sandeen804195b2007-02-10 18:35:02 +11002766 if ((ITEM_TYPE(item) == XFS_LI_BUF)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002767 if ((error = xlog_recover_do_buffer_trans(log, item,
2768 pass)))
2769 break;
Tim Shimmin6d192a92006-06-09 14:55:38 +10002770 } else if ((ITEM_TYPE(item) == XFS_LI_INODE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002771 if ((error = xlog_recover_do_inode_trans(log, item,
2772 pass)))
2773 break;
2774 } else if (ITEM_TYPE(item) == XFS_LI_EFI) {
Tim Shimmin6d192a92006-06-09 14:55:38 +10002775 if ((error = xlog_recover_do_efi_trans(log, item, trans->r_lsn,
2776 pass)))
2777 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002778 } else if (ITEM_TYPE(item) == XFS_LI_EFD) {
2779 xlog_recover_do_efd_trans(log, item, pass);
2780 } else if (ITEM_TYPE(item) == XFS_LI_DQUOT) {
2781 if ((error = xlog_recover_do_dquot_trans(log, item,
2782 pass)))
2783 break;
2784 } else if ((ITEM_TYPE(item) == XFS_LI_QUOTAOFF)) {
2785 if ((error = xlog_recover_do_quotaoff_trans(log, item,
2786 pass)))
2787 break;
2788 } else {
2789 xlog_warn("XFS: xlog_recover_do_trans");
2790 ASSERT(0);
2791 error = XFS_ERROR(EIO);
2792 break;
2793 }
2794 item = item->ri_next;
2795 } while (first_item != item);
2796
2797 return error;
2798}
2799
2800/*
2801 * Free up any resources allocated by the transaction
2802 *
2803 * Remember that EFIs, EFDs, and IUNLINKs are handled later.
2804 */
2805STATIC void
2806xlog_recover_free_trans(
2807 xlog_recover_t *trans)
2808{
2809 xlog_recover_item_t *first_item, *item, *free_item;
2810 int i;
2811
2812 item = first_item = trans->r_itemq;
2813 do {
2814 free_item = item;
2815 item = item->ri_next;
2816 /* Free the regions in the item. */
2817 for (i = 0; i < free_item->ri_cnt; i++) {
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10002818 kmem_free(free_item->ri_buf[i].i_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002819 }
2820 /* Free the item itself */
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10002821 kmem_free(free_item->ri_buf);
2822 kmem_free(free_item);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823 } while (first_item != item);
2824 /* Free the transaction recover structure */
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10002825 kmem_free(trans);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826}
2827
2828STATIC int
2829xlog_recover_commit_trans(
2830 xlog_t *log,
2831 xlog_recover_t **q,
2832 xlog_recover_t *trans,
2833 int pass)
2834{
2835 int error;
2836
2837 if ((error = xlog_recover_unlink_tid(q, trans)))
2838 return error;
2839 if ((error = xlog_recover_do_trans(log, trans, pass)))
2840 return error;
2841 xlog_recover_free_trans(trans); /* no error */
2842 return 0;
2843}
2844
2845STATIC int
2846xlog_recover_unmount_trans(
2847 xlog_recover_t *trans)
2848{
2849 /* Do nothing now */
2850 xlog_warn("XFS: xlog_recover_unmount_trans: Unmount LR");
2851 return 0;
2852}
2853
2854/*
2855 * There are two valid states of the r_state field. 0 indicates that the
2856 * transaction structure is in a normal state. We have either seen the
2857 * start of the transaction or the last operation we added was not a partial
2858 * operation. If the last operation we added to the transaction was a
2859 * partial operation, we need to mark r_state with XLOG_WAS_CONT_TRANS.
2860 *
2861 * NOTE: skip LRs with 0 data length.
2862 */
2863STATIC int
2864xlog_recover_process_data(
2865 xlog_t *log,
2866 xlog_recover_t *rhash[],
2867 xlog_rec_header_t *rhead,
2868 xfs_caddr_t dp,
2869 int pass)
2870{
2871 xfs_caddr_t lp;
2872 int num_logops;
2873 xlog_op_header_t *ohead;
2874 xlog_recover_t *trans;
2875 xlog_tid_t tid;
2876 int error;
2877 unsigned long hash;
2878 uint flags;
2879
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002880 lp = dp + be32_to_cpu(rhead->h_len);
2881 num_logops = be32_to_cpu(rhead->h_num_logops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882
2883 /* check the log format matches our own - else we can't recover */
2884 if (xlog_header_check_recover(log->l_mp, rhead))
2885 return (XFS_ERROR(EIO));
2886
2887 while ((dp < lp) && num_logops) {
2888 ASSERT(dp + sizeof(xlog_op_header_t) <= lp);
2889 ohead = (xlog_op_header_t *)dp;
2890 dp += sizeof(xlog_op_header_t);
2891 if (ohead->oh_clientid != XFS_TRANSACTION &&
2892 ohead->oh_clientid != XFS_LOG) {
2893 xlog_warn(
2894 "XFS: xlog_recover_process_data: bad clientid");
2895 ASSERT(0);
2896 return (XFS_ERROR(EIO));
2897 }
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10002898 tid = be32_to_cpu(ohead->oh_tid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002899 hash = XLOG_RHASH(tid);
2900 trans = xlog_recover_find_tid(rhash[hash], tid);
2901 if (trans == NULL) { /* not found; add new tid */
2902 if (ohead->oh_flags & XLOG_START_TRANS)
2903 xlog_recover_new_tid(&rhash[hash], tid,
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002904 be64_to_cpu(rhead->h_lsn));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 } else {
Lachlan McIlroy9742bb92008-01-10 16:43:36 +11002906 if (dp + be32_to_cpu(ohead->oh_len) > lp) {
2907 xlog_warn(
2908 "XFS: xlog_recover_process_data: bad length");
2909 WARN_ON(1);
2910 return (XFS_ERROR(EIO));
2911 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 flags = ohead->oh_flags & ~XLOG_END_TRANS;
2913 if (flags & XLOG_WAS_CONT_TRANS)
2914 flags &= ~XLOG_CONTINUE_TRANS;
2915 switch (flags) {
2916 case XLOG_COMMIT_TRANS:
2917 error = xlog_recover_commit_trans(log,
2918 &rhash[hash], trans, pass);
2919 break;
2920 case XLOG_UNMOUNT_TRANS:
2921 error = xlog_recover_unmount_trans(trans);
2922 break;
2923 case XLOG_WAS_CONT_TRANS:
2924 error = xlog_recover_add_to_cont_trans(trans,
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10002925 dp, be32_to_cpu(ohead->oh_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002926 break;
2927 case XLOG_START_TRANS:
2928 xlog_warn(
2929 "XFS: xlog_recover_process_data: bad transaction");
2930 ASSERT(0);
2931 error = XFS_ERROR(EIO);
2932 break;
2933 case 0:
2934 case XLOG_CONTINUE_TRANS:
2935 error = xlog_recover_add_to_trans(trans,
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10002936 dp, be32_to_cpu(ohead->oh_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937 break;
2938 default:
2939 xlog_warn(
2940 "XFS: xlog_recover_process_data: bad flag");
2941 ASSERT(0);
2942 error = XFS_ERROR(EIO);
2943 break;
2944 }
2945 if (error)
2946 return error;
2947 }
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10002948 dp += be32_to_cpu(ohead->oh_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002949 num_logops--;
2950 }
2951 return 0;
2952}
2953
2954/*
2955 * Process an extent free intent item that was recovered from
2956 * the log. We need to free the extents that it describes.
2957 */
David Chinner3c1e2bb2008-04-10 12:21:11 +10002958STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959xlog_recover_process_efi(
2960 xfs_mount_t *mp,
2961 xfs_efi_log_item_t *efip)
2962{
2963 xfs_efd_log_item_t *efdp;
2964 xfs_trans_t *tp;
2965 int i;
David Chinner3c1e2bb2008-04-10 12:21:11 +10002966 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002967 xfs_extent_t *extp;
2968 xfs_fsblock_t startblock_fsb;
2969
2970 ASSERT(!(efip->efi_flags & XFS_EFI_RECOVERED));
2971
2972 /*
2973 * First check the validity of the extents described by the
2974 * EFI. If any are bad, then assume that all are bad and
2975 * just toss the EFI.
2976 */
2977 for (i = 0; i < efip->efi_format.efi_nextents; i++) {
2978 extp = &(efip->efi_format.efi_extents[i]);
2979 startblock_fsb = XFS_BB_TO_FSB(mp,
2980 XFS_FSB_TO_DADDR(mp, extp->ext_start));
2981 if ((startblock_fsb == 0) ||
2982 (extp->ext_len == 0) ||
2983 (startblock_fsb >= mp->m_sb.sb_dblocks) ||
2984 (extp->ext_len >= mp->m_sb.sb_agblocks)) {
2985 /*
2986 * This will pull the EFI from the AIL and
2987 * free the memory associated with it.
2988 */
2989 xfs_efi_release(efip, efip->efi_format.efi_nextents);
David Chinner3c1e2bb2008-04-10 12:21:11 +10002990 return XFS_ERROR(EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991 }
2992 }
2993
2994 tp = xfs_trans_alloc(mp, 0);
David Chinner3c1e2bb2008-04-10 12:21:11 +10002995 error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, 0, 0);
David Chinnerfc6149d2008-04-10 12:21:53 +10002996 if (error)
2997 goto abort_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998 efdp = xfs_trans_get_efd(tp, efip, efip->efi_format.efi_nextents);
2999
3000 for (i = 0; i < efip->efi_format.efi_nextents; i++) {
3001 extp = &(efip->efi_format.efi_extents[i]);
David Chinnerfc6149d2008-04-10 12:21:53 +10003002 error = xfs_free_extent(tp, extp->ext_start, extp->ext_len);
3003 if (error)
3004 goto abort_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003005 xfs_trans_log_efd_extent(tp, efdp, extp->ext_start,
3006 extp->ext_len);
3007 }
3008
3009 efip->efi_flags |= XFS_EFI_RECOVERED;
David Chinnere5720ee2008-04-10 12:21:18 +10003010 error = xfs_trans_commit(tp, 0);
David Chinner3c1e2bb2008-04-10 12:21:11 +10003011 return error;
David Chinnerfc6149d2008-04-10 12:21:53 +10003012
3013abort_error:
3014 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
3015 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003016}
3017
3018/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003019 * When this is called, all of the EFIs which did not have
3020 * corresponding EFDs should be in the AIL. What we do now
3021 * is free the extents associated with each one.
3022 *
3023 * Since we process the EFIs in normal transactions, they
3024 * will be removed at some point after the commit. This prevents
3025 * us from just walking down the list processing each one.
3026 * We'll use a flag in the EFI to skip those that we've already
3027 * processed and use the AIL iteration mechanism's generation
3028 * count to try to speed this up at least a bit.
3029 *
3030 * When we start, we know that the EFIs are the only things in
3031 * the AIL. As we process them, however, other items are added
3032 * to the AIL. Since everything added to the AIL must come after
3033 * everything already in the AIL, we stop processing as soon as
3034 * we see something other than an EFI in the AIL.
3035 */
David Chinner3c1e2bb2008-04-10 12:21:11 +10003036STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037xlog_recover_process_efis(
3038 xlog_t *log)
3039{
3040 xfs_log_item_t *lip;
3041 xfs_efi_log_item_t *efip;
David Chinner3c1e2bb2008-04-10 12:21:11 +10003042 int error = 0;
David Chinner27d8d5f2008-10-30 17:38:39 +11003043 struct xfs_ail_cursor cur;
David Chinnera9c21c12008-10-30 17:39:35 +11003044 struct xfs_ail *ailp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045
David Chinnera9c21c12008-10-30 17:39:35 +11003046 ailp = log->l_ailp;
3047 spin_lock(&ailp->xa_lock);
3048 lip = xfs_trans_ail_cursor_first(ailp, &cur, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049 while (lip != NULL) {
3050 /*
3051 * We're done when we see something other than an EFI.
David Chinner27d8d5f2008-10-30 17:38:39 +11003052 * There should be no EFIs left in the AIL now.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003053 */
3054 if (lip->li_type != XFS_LI_EFI) {
David Chinner27d8d5f2008-10-30 17:38:39 +11003055#ifdef DEBUG
David Chinnera9c21c12008-10-30 17:39:35 +11003056 for (; lip; lip = xfs_trans_ail_cursor_next(ailp, &cur))
David Chinner27d8d5f2008-10-30 17:38:39 +11003057 ASSERT(lip->li_type != XFS_LI_EFI);
3058#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059 break;
3060 }
3061
3062 /*
3063 * Skip EFIs that we've already processed.
3064 */
3065 efip = (xfs_efi_log_item_t *)lip;
3066 if (efip->efi_flags & XFS_EFI_RECOVERED) {
David Chinnera9c21c12008-10-30 17:39:35 +11003067 lip = xfs_trans_ail_cursor_next(ailp, &cur);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068 continue;
3069 }
3070
David Chinnera9c21c12008-10-30 17:39:35 +11003071 spin_unlock(&ailp->xa_lock);
3072 error = xlog_recover_process_efi(log->l_mp, efip);
3073 spin_lock(&ailp->xa_lock);
David Chinner27d8d5f2008-10-30 17:38:39 +11003074 if (error)
3075 goto out;
David Chinnera9c21c12008-10-30 17:39:35 +11003076 lip = xfs_trans_ail_cursor_next(ailp, &cur);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003077 }
David Chinner27d8d5f2008-10-30 17:38:39 +11003078out:
David Chinnera9c21c12008-10-30 17:39:35 +11003079 xfs_trans_ail_cursor_done(ailp, &cur);
3080 spin_unlock(&ailp->xa_lock);
David Chinner3c1e2bb2008-04-10 12:21:11 +10003081 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003082}
3083
3084/*
3085 * This routine performs a transaction to null out a bad inode pointer
3086 * in an agi unlinked inode hash bucket.
3087 */
3088STATIC void
3089xlog_recover_clear_agi_bucket(
3090 xfs_mount_t *mp,
3091 xfs_agnumber_t agno,
3092 int bucket)
3093{
3094 xfs_trans_t *tp;
3095 xfs_agi_t *agi;
3096 xfs_buf_t *agibp;
3097 int offset;
3098 int error;
3099
3100 tp = xfs_trans_alloc(mp, XFS_TRANS_CLEAR_AGI_BUCKET);
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003101 error = xfs_trans_reserve(tp, 0, XFS_CLEAR_AGI_BUCKET_LOG_RES(mp),
3102 0, 0, 0);
David Chinnere5720ee2008-04-10 12:21:18 +10003103 if (error)
3104 goto out_abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003106 error = xfs_read_agi(mp, tp, agno, &agibp);
3107 if (error)
David Chinnere5720ee2008-04-10 12:21:18 +10003108 goto out_abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003109
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003110 agi = XFS_BUF_TO_AGI(agibp);
Christoph Hellwig16259e72005-11-02 15:11:25 +11003111 agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003112 offset = offsetof(xfs_agi_t, agi_unlinked) +
3113 (sizeof(xfs_agino_t) * bucket);
3114 xfs_trans_log_buf(tp, agibp, offset,
3115 (offset + sizeof(xfs_agino_t) - 1));
3116
David Chinnere5720ee2008-04-10 12:21:18 +10003117 error = xfs_trans_commit(tp, 0);
3118 if (error)
3119 goto out_error;
3120 return;
3121
3122out_abort:
3123 xfs_trans_cancel(tp, XFS_TRANS_ABORT);
3124out_error:
3125 xfs_fs_cmn_err(CE_WARN, mp, "xlog_recover_clear_agi_bucket: "
3126 "failed to clear agi %d. Continuing.", agno);
3127 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128}
3129
Christoph Hellwig23fac502008-11-28 14:23:40 +11003130STATIC xfs_agino_t
3131xlog_recover_process_one_iunlink(
3132 struct xfs_mount *mp,
3133 xfs_agnumber_t agno,
3134 xfs_agino_t agino,
3135 int bucket)
3136{
3137 struct xfs_buf *ibp;
3138 struct xfs_dinode *dip;
3139 struct xfs_inode *ip;
3140 xfs_ino_t ino;
3141 int error;
3142
3143 ino = XFS_AGINO_TO_INO(mp, agno, agino);
3144 error = xfs_iget(mp, NULL, ino, 0, 0, &ip, 0);
3145 if (error)
3146 goto fail;
3147
3148 /*
3149 * Get the on disk inode to find the next inode in the bucket.
3150 */
3151 ASSERT(ip != NULL);
Christoph Hellwig76d8b272008-11-28 14:23:40 +11003152 error = xfs_itobp(mp, NULL, ip, &dip, &ibp, XFS_BUF_LOCK);
Christoph Hellwig23fac502008-11-28 14:23:40 +11003153 if (error)
3154 goto fail;
3155
3156 ASSERT(dip != NULL);
3157 ASSERT(ip->i_d.di_nlink == 0);
3158
3159 /* setup for the next pass */
3160 agino = be32_to_cpu(dip->di_next_unlinked);
3161 xfs_buf_relse(ibp);
3162
3163 /*
3164 * Prevent any DMAPI event from being sent when the reference on
3165 * the inode is dropped.
3166 */
3167 ip->i_d.di_dmevmask = 0;
3168
3169 /*
3170 * If this is a new inode, handle it specially. Otherwise, just
3171 * drop our reference to the inode. If there are no other
3172 * references, this will send the inode to xfs_inactive() which
3173 * will truncate the file and free the inode.
3174 */
3175 if (ip->i_d.di_mode == 0)
3176 xfs_iput_new(ip, 0);
3177 else
3178 IRELE(ip);
3179 return agino;
3180
3181 fail:
3182 /*
3183 * We can't read in the inode this bucket points to, or this inode
3184 * is messed up. Just ditch this bucket of inodes. We will lose
3185 * some inodes and space, but at least we won't hang.
3186 *
3187 * Call xlog_recover_clear_agi_bucket() to perform a transaction to
3188 * clear the inode pointer in the bucket.
3189 */
3190 xlog_recover_clear_agi_bucket(mp, agno, bucket);
3191 return NULLAGINO;
3192}
3193
Linus Torvalds1da177e2005-04-16 15:20:36 -07003194/*
3195 * xlog_iunlink_recover
3196 *
3197 * This is called during recovery to process any inodes which
3198 * we unlinked but not freed when the system crashed. These
3199 * inodes will be on the lists in the AGI blocks. What we do
3200 * here is scan all the AGIs and fully truncate and free any
3201 * inodes found on the lists. Each inode is removed from the
3202 * lists when it has been fully truncated and is freed. The
3203 * freeing of the inode and its removal from the list must be
3204 * atomic.
3205 */
3206void
3207xlog_recover_process_iunlinks(
3208 xlog_t *log)
3209{
3210 xfs_mount_t *mp;
3211 xfs_agnumber_t agno;
3212 xfs_agi_t *agi;
3213 xfs_buf_t *agibp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003214 xfs_agino_t agino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003215 int bucket;
3216 int error;
3217 uint mp_dmevmask;
3218
3219 mp = log->l_mp;
3220
3221 /*
3222 * Prevent any DMAPI event from being sent while in this function.
3223 */
3224 mp_dmevmask = mp->m_dmevmask;
3225 mp->m_dmevmask = 0;
3226
3227 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
3228 /*
3229 * Find the agi for this ag.
3230 */
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003231 error = xfs_read_agi(mp, NULL, agno, &agibp);
3232 if (error) {
3233 /*
3234 * AGI is b0rked. Don't process it.
3235 *
3236 * We should probably mark the filesystem as corrupt
3237 * after we've recovered all the ag's we can....
3238 */
3239 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003240 }
3241 agi = XFS_BUF_TO_AGI(agibp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003242
3243 for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++) {
Christoph Hellwig16259e72005-11-02 15:11:25 +11003244 agino = be32_to_cpu(agi->agi_unlinked[bucket]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003245 while (agino != NULLAGINO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003246 /*
3247 * Release the agi buffer so that it can
3248 * be acquired in the normal course of the
3249 * transaction to truncate and free the inode.
3250 */
3251 xfs_buf_relse(agibp);
3252
Christoph Hellwig23fac502008-11-28 14:23:40 +11003253 agino = xlog_recover_process_one_iunlink(mp,
3254 agno, agino, bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003255
3256 /*
3257 * Reacquire the agibuffer and continue around
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003258 * the loop. This should never fail as we know
3259 * the buffer was good earlier on.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003260 */
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003261 error = xfs_read_agi(mp, NULL, agno, &agibp);
3262 ASSERT(error == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003263 agi = XFS_BUF_TO_AGI(agibp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003264 }
3265 }
3266
3267 /*
3268 * Release the buffer for the current agi so we can
3269 * go on to the next one.
3270 */
3271 xfs_buf_relse(agibp);
3272 }
3273
3274 mp->m_dmevmask = mp_dmevmask;
3275}
3276
3277
3278#ifdef DEBUG
3279STATIC void
3280xlog_pack_data_checksum(
3281 xlog_t *log,
3282 xlog_in_core_t *iclog,
3283 int size)
3284{
3285 int i;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003286 __be32 *up;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287 uint chksum = 0;
3288
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003289 up = (__be32 *)iclog->ic_datap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003290 /* divide length by 4 to get # words */
3291 for (i = 0; i < (size >> 2); i++) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003292 chksum ^= be32_to_cpu(*up);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003293 up++;
3294 }
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003295 iclog->ic_header.h_chksum = cpu_to_be32(chksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003296}
3297#else
3298#define xlog_pack_data_checksum(log, iclog, size)
3299#endif
3300
3301/*
3302 * Stamp cycle number in every block
3303 */
3304void
3305xlog_pack_data(
3306 xlog_t *log,
3307 xlog_in_core_t *iclog,
3308 int roundoff)
3309{
3310 int i, j, k;
3311 int size = iclog->ic_offset + roundoff;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003312 __be32 cycle_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003313 xfs_caddr_t dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003314
3315 xlog_pack_data_checksum(log, iclog, size);
3316
3317 cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn);
3318
3319 dp = iclog->ic_datap;
3320 for (i = 0; i < BTOBB(size) &&
3321 i < (XLOG_HEADER_CYCLE_SIZE / BBSIZE); i++) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003322 iclog->ic_header.h_cycle_data[i] = *(__be32 *)dp;
3323 *(__be32 *)dp = cycle_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003324 dp += BBSIZE;
3325 }
3326
Eric Sandeen62118702008-03-06 13:44:28 +11003327 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
Christoph Hellwigb28708d2008-11-28 14:23:38 +11003328 xlog_in_core_2_t *xhdr = iclog->ic_data;
3329
Linus Torvalds1da177e2005-04-16 15:20:36 -07003330 for ( ; i < BTOBB(size); i++) {
3331 j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3332 k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003333 xhdr[j].hic_xheader.xh_cycle_data[k] = *(__be32 *)dp;
3334 *(__be32 *)dp = cycle_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003335 dp += BBSIZE;
3336 }
3337
3338 for (i = 1; i < log->l_iclog_heads; i++) {
3339 xhdr[i].hic_xheader.xh_cycle = cycle_lsn;
3340 }
3341 }
3342}
3343
3344#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
3345STATIC void
3346xlog_unpack_data_checksum(
3347 xlog_rec_header_t *rhead,
3348 xfs_caddr_t dp,
3349 xlog_t *log)
3350{
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003351 __be32 *up = (__be32 *)dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003352 uint chksum = 0;
3353 int i;
3354
3355 /* divide length by 4 to get # words */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003356 for (i=0; i < be32_to_cpu(rhead->h_len) >> 2; i++) {
3357 chksum ^= be32_to_cpu(*up);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003358 up++;
3359 }
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003360 if (chksum != be32_to_cpu(rhead->h_chksum)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003361 if (rhead->h_chksum ||
3362 ((log->l_flags & XLOG_CHKSUM_MISMATCH) == 0)) {
3363 cmn_err(CE_DEBUG,
Nathan Scottb6574522006-06-09 15:29:40 +10003364 "XFS: LogR chksum mismatch: was (0x%x) is (0x%x)\n",
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003365 be32_to_cpu(rhead->h_chksum), chksum);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003366 cmn_err(CE_DEBUG,
3367"XFS: Disregard message if filesystem was created with non-DEBUG kernel");
Eric Sandeen62118702008-03-06 13:44:28 +11003368 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003369 cmn_err(CE_DEBUG,
Nathan Scottb6574522006-06-09 15:29:40 +10003370 "XFS: LogR this is a LogV2 filesystem\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003371 }
3372 log->l_flags |= XLOG_CHKSUM_MISMATCH;
3373 }
3374 }
3375}
3376#else
3377#define xlog_unpack_data_checksum(rhead, dp, log)
3378#endif
3379
3380STATIC void
3381xlog_unpack_data(
3382 xlog_rec_header_t *rhead,
3383 xfs_caddr_t dp,
3384 xlog_t *log)
3385{
3386 int i, j, k;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003387
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003388 for (i = 0; i < BTOBB(be32_to_cpu(rhead->h_len)) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07003389 i < (XLOG_HEADER_CYCLE_SIZE / BBSIZE); i++) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003390 *(__be32 *)dp = *(__be32 *)&rhead->h_cycle_data[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003391 dp += BBSIZE;
3392 }
3393
Eric Sandeen62118702008-03-06 13:44:28 +11003394 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
Christoph Hellwigb28708d2008-11-28 14:23:38 +11003395 xlog_in_core_2_t *xhdr = (xlog_in_core_2_t *)rhead;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003396 for ( ; i < BTOBB(be32_to_cpu(rhead->h_len)); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003397 j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3398 k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003399 *(__be32 *)dp = xhdr[j].hic_xheader.xh_cycle_data[k];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003400 dp += BBSIZE;
3401 }
3402 }
3403
3404 xlog_unpack_data_checksum(rhead, dp, log);
3405}
3406
3407STATIC int
3408xlog_valid_rec_header(
3409 xlog_t *log,
3410 xlog_rec_header_t *rhead,
3411 xfs_daddr_t blkno)
3412{
3413 int hlen;
3414
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003415 if (unlikely(be32_to_cpu(rhead->h_magicno) != XLOG_HEADER_MAGIC_NUM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003416 XFS_ERROR_REPORT("xlog_valid_rec_header(1)",
3417 XFS_ERRLEVEL_LOW, log->l_mp);
3418 return XFS_ERROR(EFSCORRUPTED);
3419 }
3420 if (unlikely(
3421 (!rhead->h_version ||
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003422 (be32_to_cpu(rhead->h_version) & (~XLOG_VERSION_OKBITS))))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003423 xlog_warn("XFS: %s: unrecognised log version (%d).",
Harvey Harrison34a622b2008-04-10 12:19:21 +10003424 __func__, be32_to_cpu(rhead->h_version));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425 return XFS_ERROR(EIO);
3426 }
3427
3428 /* LR body must have data or it wouldn't have been written */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003429 hlen = be32_to_cpu(rhead->h_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003430 if (unlikely( hlen <= 0 || hlen > INT_MAX )) {
3431 XFS_ERROR_REPORT("xlog_valid_rec_header(2)",
3432 XFS_ERRLEVEL_LOW, log->l_mp);
3433 return XFS_ERROR(EFSCORRUPTED);
3434 }
3435 if (unlikely( blkno > log->l_logBBsize || blkno > INT_MAX )) {
3436 XFS_ERROR_REPORT("xlog_valid_rec_header(3)",
3437 XFS_ERRLEVEL_LOW, log->l_mp);
3438 return XFS_ERROR(EFSCORRUPTED);
3439 }
3440 return 0;
3441}
3442
3443/*
3444 * Read the log from tail to head and process the log records found.
3445 * Handle the two cases where the tail and head are in the same cycle
3446 * and where the active portion of the log wraps around the end of
3447 * the physical log separately. The pass parameter is passed through
3448 * to the routines called to process the data and is not looked at
3449 * here.
3450 */
3451STATIC int
3452xlog_do_recovery_pass(
3453 xlog_t *log,
3454 xfs_daddr_t head_blk,
3455 xfs_daddr_t tail_blk,
3456 int pass)
3457{
3458 xlog_rec_header_t *rhead;
3459 xfs_daddr_t blk_no;
3460 xfs_caddr_t bufaddr, offset;
3461 xfs_buf_t *hbp, *dbp;
3462 int error = 0, h_size;
3463 int bblks, split_bblks;
3464 int hblks, split_hblks, wrapped_hblks;
3465 xlog_recover_t *rhash[XLOG_RHASH_SIZE];
3466
3467 ASSERT(head_blk != tail_blk);
3468
3469 /*
3470 * Read the header of the tail block and get the iclog buffer size from
3471 * h_size. Use this to tell how many sectors make up the log header.
3472 */
Eric Sandeen62118702008-03-06 13:44:28 +11003473 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003474 /*
3475 * When using variable length iclogs, read first sector of
3476 * iclog header and extract the header size from it. Get a
3477 * new hbp that is the correct size.
3478 */
3479 hbp = xlog_get_bp(log, 1);
3480 if (!hbp)
3481 return ENOMEM;
3482 if ((error = xlog_bread(log, tail_blk, 1, hbp)))
3483 goto bread_err1;
3484 offset = xlog_align(log, tail_blk, 1, hbp);
3485 rhead = (xlog_rec_header_t *)offset;
3486 error = xlog_valid_rec_header(log, rhead, tail_blk);
3487 if (error)
3488 goto bread_err1;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003489 h_size = be32_to_cpu(rhead->h_size);
3490 if ((be32_to_cpu(rhead->h_version) & XLOG_VERSION_2) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07003491 (h_size > XLOG_HEADER_CYCLE_SIZE)) {
3492 hblks = h_size / XLOG_HEADER_CYCLE_SIZE;
3493 if (h_size % XLOG_HEADER_CYCLE_SIZE)
3494 hblks++;
3495 xlog_put_bp(hbp);
3496 hbp = xlog_get_bp(log, hblks);
3497 } else {
3498 hblks = 1;
3499 }
3500 } else {
3501 ASSERT(log->l_sectbb_log == 0);
3502 hblks = 1;
3503 hbp = xlog_get_bp(log, 1);
3504 h_size = XLOG_BIG_RECORD_BSIZE;
3505 }
3506
3507 if (!hbp)
3508 return ENOMEM;
3509 dbp = xlog_get_bp(log, BTOBB(h_size));
3510 if (!dbp) {
3511 xlog_put_bp(hbp);
3512 return ENOMEM;
3513 }
3514
3515 memset(rhash, 0, sizeof(rhash));
3516 if (tail_blk <= head_blk) {
3517 for (blk_no = tail_blk; blk_no < head_blk; ) {
3518 if ((error = xlog_bread(log, blk_no, hblks, hbp)))
3519 goto bread_err2;
3520 offset = xlog_align(log, blk_no, hblks, hbp);
3521 rhead = (xlog_rec_header_t *)offset;
3522 error = xlog_valid_rec_header(log, rhead, blk_no);
3523 if (error)
3524 goto bread_err2;
3525
3526 /* blocks in data section */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003527 bblks = (int)BTOBB(be32_to_cpu(rhead->h_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003528 error = xlog_bread(log, blk_no + hblks, bblks, dbp);
3529 if (error)
3530 goto bread_err2;
3531 offset = xlog_align(log, blk_no + hblks, bblks, dbp);
3532 xlog_unpack_data(rhead, offset, log);
3533 if ((error = xlog_recover_process_data(log,
3534 rhash, rhead, offset, pass)))
3535 goto bread_err2;
3536 blk_no += bblks + hblks;
3537 }
3538 } else {
3539 /*
3540 * Perform recovery around the end of the physical log.
3541 * When the head is not on the same cycle number as the tail,
3542 * we can't do a sequential recovery as above.
3543 */
3544 blk_no = tail_blk;
3545 while (blk_no < log->l_logBBsize) {
3546 /*
3547 * Check for header wrapping around physical end-of-log
3548 */
3549 offset = NULL;
3550 split_hblks = 0;
3551 wrapped_hblks = 0;
3552 if (blk_no + hblks <= log->l_logBBsize) {
3553 /* Read header in one read */
3554 error = xlog_bread(log, blk_no, hblks, hbp);
3555 if (error)
3556 goto bread_err2;
3557 offset = xlog_align(log, blk_no, hblks, hbp);
3558 } else {
3559 /* This LR is split across physical log end */
3560 if (blk_no != log->l_logBBsize) {
3561 /* some data before physical log end */
3562 ASSERT(blk_no <= INT_MAX);
3563 split_hblks = log->l_logBBsize - (int)blk_no;
3564 ASSERT(split_hblks > 0);
3565 if ((error = xlog_bread(log, blk_no,
3566 split_hblks, hbp)))
3567 goto bread_err2;
3568 offset = xlog_align(log, blk_no,
3569 split_hblks, hbp);
3570 }
3571 /*
3572 * Note: this black magic still works with
3573 * large sector sizes (non-512) only because:
3574 * - we increased the buffer size originally
3575 * by 1 sector giving us enough extra space
3576 * for the second read;
3577 * - the log start is guaranteed to be sector
3578 * aligned;
3579 * - we read the log end (LR header start)
3580 * _first_, then the log start (LR header end)
3581 * - order is important.
3582 */
David Chinner234f56a2008-04-10 12:24:24 +10003583 wrapped_hblks = hblks - split_hblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003584 bufaddr = XFS_BUF_PTR(hbp);
David Chinner234f56a2008-04-10 12:24:24 +10003585 error = XFS_BUF_SET_PTR(hbp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003586 bufaddr + BBTOB(split_hblks),
3587 BBTOB(hblks - split_hblks));
David Chinner234f56a2008-04-10 12:24:24 +10003588 if (!error)
3589 error = xlog_bread(log, 0,
3590 wrapped_hblks, hbp);
3591 if (!error)
3592 error = XFS_BUF_SET_PTR(hbp, bufaddr,
3593 BBTOB(hblks));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003594 if (error)
3595 goto bread_err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596 if (!offset)
3597 offset = xlog_align(log, 0,
3598 wrapped_hblks, hbp);
3599 }
3600 rhead = (xlog_rec_header_t *)offset;
3601 error = xlog_valid_rec_header(log, rhead,
3602 split_hblks ? blk_no : 0);
3603 if (error)
3604 goto bread_err2;
3605
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003606 bblks = (int)BTOBB(be32_to_cpu(rhead->h_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003607 blk_no += hblks;
3608
3609 /* Read in data for log record */
3610 if (blk_no + bblks <= log->l_logBBsize) {
3611 error = xlog_bread(log, blk_no, bblks, dbp);
3612 if (error)
3613 goto bread_err2;
3614 offset = xlog_align(log, blk_no, bblks, dbp);
3615 } else {
3616 /* This log record is split across the
3617 * physical end of log */
3618 offset = NULL;
3619 split_bblks = 0;
3620 if (blk_no != log->l_logBBsize) {
3621 /* some data is before the physical
3622 * end of log */
3623 ASSERT(!wrapped_hblks);
3624 ASSERT(blk_no <= INT_MAX);
3625 split_bblks =
3626 log->l_logBBsize - (int)blk_no;
3627 ASSERT(split_bblks > 0);
3628 if ((error = xlog_bread(log, blk_no,
3629 split_bblks, dbp)))
3630 goto bread_err2;
3631 offset = xlog_align(log, blk_no,
3632 split_bblks, dbp);
3633 }
3634 /*
3635 * Note: this black magic still works with
3636 * large sector sizes (non-512) only because:
3637 * - we increased the buffer size originally
3638 * by 1 sector giving us enough extra space
3639 * for the second read;
3640 * - the log start is guaranteed to be sector
3641 * aligned;
3642 * - we read the log end (LR header start)
3643 * _first_, then the log start (LR header end)
3644 * - order is important.
3645 */
3646 bufaddr = XFS_BUF_PTR(dbp);
David Chinner234f56a2008-04-10 12:24:24 +10003647 error = XFS_BUF_SET_PTR(dbp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003648 bufaddr + BBTOB(split_bblks),
3649 BBTOB(bblks - split_bblks));
David Chinner234f56a2008-04-10 12:24:24 +10003650 if (!error)
3651 error = xlog_bread(log, wrapped_hblks,
3652 bblks - split_bblks,
3653 dbp);
3654 if (!error)
3655 error = XFS_BUF_SET_PTR(dbp, bufaddr,
3656 h_size);
3657 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003658 goto bread_err2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003659 if (!offset)
3660 offset = xlog_align(log, wrapped_hblks,
3661 bblks - split_bblks, dbp);
3662 }
3663 xlog_unpack_data(rhead, offset, log);
3664 if ((error = xlog_recover_process_data(log, rhash,
3665 rhead, offset, pass)))
3666 goto bread_err2;
3667 blk_no += bblks;
3668 }
3669
3670 ASSERT(blk_no >= log->l_logBBsize);
3671 blk_no -= log->l_logBBsize;
3672
3673 /* read first part of physical log */
3674 while (blk_no < head_blk) {
3675 if ((error = xlog_bread(log, blk_no, hblks, hbp)))
3676 goto bread_err2;
3677 offset = xlog_align(log, blk_no, hblks, hbp);
3678 rhead = (xlog_rec_header_t *)offset;
3679 error = xlog_valid_rec_header(log, rhead, blk_no);
3680 if (error)
3681 goto bread_err2;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003682 bblks = (int)BTOBB(be32_to_cpu(rhead->h_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003683 if ((error = xlog_bread(log, blk_no+hblks, bblks, dbp)))
3684 goto bread_err2;
3685 offset = xlog_align(log, blk_no+hblks, bblks, dbp);
3686 xlog_unpack_data(rhead, offset, log);
3687 if ((error = xlog_recover_process_data(log, rhash,
3688 rhead, offset, pass)))
3689 goto bread_err2;
3690 blk_no += bblks + hblks;
3691 }
3692 }
3693
3694 bread_err2:
3695 xlog_put_bp(dbp);
3696 bread_err1:
3697 xlog_put_bp(hbp);
3698 return error;
3699}
3700
3701/*
3702 * Do the recovery of the log. We actually do this in two phases.
3703 * The two passes are necessary in order to implement the function
3704 * of cancelling a record written into the log. The first pass
3705 * determines those things which have been cancelled, and the
3706 * second pass replays log items normally except for those which
3707 * have been cancelled. The handling of the replay and cancellations
3708 * takes place in the log item type specific routines.
3709 *
3710 * The table of items which have cancel records in the log is allocated
3711 * and freed at this level, since only here do we know when all of
3712 * the log recovery has been completed.
3713 */
3714STATIC int
3715xlog_do_log_recovery(
3716 xlog_t *log,
3717 xfs_daddr_t head_blk,
3718 xfs_daddr_t tail_blk)
3719{
3720 int error;
3721
3722 ASSERT(head_blk != tail_blk);
3723
3724 /*
3725 * First do a pass to find all of the cancelled buf log items.
3726 * Store them in the buf_cancel_table for use in the second pass.
3727 */
3728 log->l_buf_cancel_table =
3729 (xfs_buf_cancel_t **)kmem_zalloc(XLOG_BC_TABLE_SIZE *
3730 sizeof(xfs_buf_cancel_t*),
3731 KM_SLEEP);
3732 error = xlog_do_recovery_pass(log, head_blk, tail_blk,
3733 XLOG_RECOVER_PASS1);
3734 if (error != 0) {
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10003735 kmem_free(log->l_buf_cancel_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003736 log->l_buf_cancel_table = NULL;
3737 return error;
3738 }
3739 /*
3740 * Then do a second pass to actually recover the items in the log.
3741 * When it is complete free the table of buf cancel items.
3742 */
3743 error = xlog_do_recovery_pass(log, head_blk, tail_blk,
3744 XLOG_RECOVER_PASS2);
3745#ifdef DEBUG
Tim Shimmin6d192a92006-06-09 14:55:38 +10003746 if (!error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003747 int i;
3748
3749 for (i = 0; i < XLOG_BC_TABLE_SIZE; i++)
3750 ASSERT(log->l_buf_cancel_table[i] == NULL);
3751 }
3752#endif /* DEBUG */
3753
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10003754 kmem_free(log->l_buf_cancel_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003755 log->l_buf_cancel_table = NULL;
3756
3757 return error;
3758}
3759
3760/*
3761 * Do the actual recovery
3762 */
3763STATIC int
3764xlog_do_recover(
3765 xlog_t *log,
3766 xfs_daddr_t head_blk,
3767 xfs_daddr_t tail_blk)
3768{
3769 int error;
3770 xfs_buf_t *bp;
3771 xfs_sb_t *sbp;
3772
3773 /*
3774 * First replay the images in the log.
3775 */
3776 error = xlog_do_log_recovery(log, head_blk, tail_blk);
3777 if (error) {
3778 return error;
3779 }
3780
3781 XFS_bflush(log->l_mp->m_ddev_targp);
3782
3783 /*
3784 * If IO errors happened during recovery, bail out.
3785 */
3786 if (XFS_FORCED_SHUTDOWN(log->l_mp)) {
3787 return (EIO);
3788 }
3789
3790 /*
3791 * We now update the tail_lsn since much of the recovery has completed
3792 * and there may be space available to use. If there were no extent
3793 * or iunlinks, we can free up the entire log and set the tail_lsn to
3794 * be the last_sync_lsn. This was set in xlog_find_tail to be the
3795 * lsn of the last known good LR on disk. If there are extent frees
3796 * or iunlinks they will have some entries in the AIL; so we look at
3797 * the AIL to determine how to set the tail_lsn.
3798 */
3799 xlog_assign_tail_lsn(log->l_mp);
3800
3801 /*
3802 * Now that we've finished replaying all buffer and inode
3803 * updates, re-read in the superblock.
3804 */
3805 bp = xfs_getsb(log->l_mp, 0);
3806 XFS_BUF_UNDONE(bp);
Lachlan McIlroybebf9632007-10-15 13:18:02 +10003807 ASSERT(!(XFS_BUF_ISWRITE(bp)));
3808 ASSERT(!(XFS_BUF_ISDELAYWRITE(bp)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003809 XFS_BUF_READ(bp);
Lachlan McIlroybebf9632007-10-15 13:18:02 +10003810 XFS_BUF_UNASYNC(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003811 xfsbdstrat(log->l_mp, bp);
David Chinnerd64e31a2008-04-10 12:22:17 +10003812 error = xfs_iowait(bp);
3813 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003814 xfs_ioerror_alert("xlog_do_recover",
3815 log->l_mp, bp, XFS_BUF_ADDR(bp));
3816 ASSERT(0);
3817 xfs_buf_relse(bp);
3818 return error;
3819 }
3820
3821 /* Convert superblock from on-disk format */
3822 sbp = &log->l_mp->m_sb;
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10003823 xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(bp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003824 ASSERT(sbp->sb_magicnum == XFS_SB_MAGIC);
Eric Sandeen62118702008-03-06 13:44:28 +11003825 ASSERT(xfs_sb_good_version(sbp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003826 xfs_buf_relse(bp);
3827
Lachlan McIlroy5478eea2007-02-10 18:36:29 +11003828 /* We've re-read the superblock so re-initialize per-cpu counters */
3829 xfs_icsb_reinit_counters(log->l_mp);
3830
Linus Torvalds1da177e2005-04-16 15:20:36 -07003831 xlog_recover_check_summary(log);
3832
3833 /* Normal transactions can now occur */
3834 log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
3835 return 0;
3836}
3837
3838/*
3839 * Perform recovery and re-initialize some log variables in xlog_find_tail.
3840 *
3841 * Return error or zero.
3842 */
3843int
3844xlog_recover(
Eric Sandeen65be6052006-01-11 15:34:19 +11003845 xlog_t *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003846{
3847 xfs_daddr_t head_blk, tail_blk;
3848 int error;
3849
3850 /* find the tail of the log */
Eric Sandeen65be6052006-01-11 15:34:19 +11003851 if ((error = xlog_find_tail(log, &head_blk, &tail_blk)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003852 return error;
3853
3854 if (tail_blk != head_blk) {
3855 /* There used to be a comment here:
3856 *
3857 * disallow recovery on read-only mounts. note -- mount
3858 * checks for ENOSPC and turns it into an intelligent
3859 * error message.
3860 * ...but this is no longer true. Now, unless you specify
3861 * NORECOVERY (in which case this function would never be
3862 * called), we just go ahead and recover. We do this all
3863 * under the vfs layer, so we can get away with it unless
3864 * the device itself is read-only, in which case we fail.
3865 */
Utako Kusaka3a02ee12007-05-08 13:50:06 +10003866 if ((error = xfs_dev_is_read_only(log->l_mp, "recovery"))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003867 return error;
3868 }
3869
3870 cmn_err(CE_NOTE,
Nathan Scottfc1f8c12005-11-02 11:44:33 +11003871 "Starting XFS recovery on filesystem: %s (logdev: %s)",
3872 log->l_mp->m_fsname, log->l_mp->m_logname ?
3873 log->l_mp->m_logname : "internal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003874
3875 error = xlog_do_recover(log, head_blk, tail_blk);
3876 log->l_flags |= XLOG_RECOVERY_NEEDED;
3877 }
3878 return error;
3879}
3880
3881/*
3882 * In the first part of recovery we replay inodes and buffers and build
3883 * up the list of extent free items which need to be processed. Here
3884 * we process the extent free items and clean up the on disk unlinked
3885 * inode lists. This is separated from the first part of recovery so
3886 * that the root and real-time bitmap inodes can be read in from disk in
3887 * between the two stages. This is necessary so that we can free space
3888 * in the real-time portion of the file system.
3889 */
3890int
3891xlog_recover_finish(
Christoph Hellwig42490232008-08-13 16:49:32 +10003892 xlog_t *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003893{
3894 /*
3895 * Now we're ready to do the transactions needed for the
3896 * rest of recovery. Start with completing all the extent
3897 * free intent records and then process the unlinked inode
3898 * lists. At this point, we essentially run in normal mode
3899 * except that we're still performing recovery actions
3900 * rather than accepting new requests.
3901 */
3902 if (log->l_flags & XLOG_RECOVERY_NEEDED) {
David Chinner3c1e2bb2008-04-10 12:21:11 +10003903 int error;
3904 error = xlog_recover_process_efis(log);
3905 if (error) {
3906 cmn_err(CE_ALERT,
3907 "Failed to recover EFIs on filesystem: %s",
3908 log->l_mp->m_fsname);
3909 return error;
3910 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003911 /*
3912 * Sync the log to get all the EFIs out of the AIL.
3913 * This isn't absolutely necessary, but it helps in
3914 * case the unlink transactions would have problems
3915 * pushing the EFIs out of the way.
3916 */
3917 xfs_log_force(log->l_mp, (xfs_lsn_t)0,
3918 (XFS_LOG_FORCE | XFS_LOG_SYNC));
3919
Christoph Hellwig42490232008-08-13 16:49:32 +10003920 xlog_recover_process_iunlinks(log);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003921
3922 xlog_recover_check_summary(log);
3923
3924 cmn_err(CE_NOTE,
Nathan Scottfc1f8c12005-11-02 11:44:33 +11003925 "Ending XFS recovery on filesystem: %s (logdev: %s)",
3926 log->l_mp->m_fsname, log->l_mp->m_logname ?
3927 log->l_mp->m_logname : "internal");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003928 log->l_flags &= ~XLOG_RECOVERY_NEEDED;
3929 } else {
3930 cmn_err(CE_DEBUG,
Nathan Scottb6574522006-06-09 15:29:40 +10003931 "!Ending clean XFS mount for filesystem: %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003932 log->l_mp->m_fsname);
3933 }
3934 return 0;
3935}
3936
3937
3938#if defined(DEBUG)
3939/*
3940 * Read all of the agf and agi counters and check that they
3941 * are consistent with the superblock counters.
3942 */
3943void
3944xlog_recover_check_summary(
3945 xlog_t *log)
3946{
3947 xfs_mount_t *mp;
3948 xfs_agf_t *agfp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003949 xfs_buf_t *agfbp;
3950 xfs_buf_t *agibp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003951 xfs_buf_t *sbbp;
3952#ifdef XFS_LOUD_RECOVERY
3953 xfs_sb_t *sbp;
3954#endif
3955 xfs_agnumber_t agno;
3956 __uint64_t freeblks;
3957 __uint64_t itotal;
3958 __uint64_t ifree;
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003959 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003960
3961 mp = log->l_mp;
3962
3963 freeblks = 0LL;
3964 itotal = 0LL;
3965 ifree = 0LL;
3966 for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
From: Christoph Hellwig48056212008-11-28 14:23:38 +11003967 error = xfs_read_agf(mp, NULL, agno, 0, &agfbp);
3968 if (error) {
3969 xfs_fs_cmn_err(CE_ALERT, mp,
3970 "xlog_recover_check_summary(agf)"
3971 "agf read failed agno %d error %d",
3972 agno, error);
3973 } else {
3974 agfp = XFS_BUF_TO_AGF(agfbp);
3975 freeblks += be32_to_cpu(agfp->agf_freeblks) +
3976 be32_to_cpu(agfp->agf_flcount);
3977 xfs_buf_relse(agfbp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003978 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003979
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003980 error = xfs_read_agi(mp, NULL, agno, &agibp);
3981 if (!error) {
3982 struct xfs_agi *agi = XFS_BUF_TO_AGI(agibp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003983
Christoph Hellwig5e1be0f2008-11-28 14:23:37 +11003984 itotal += be32_to_cpu(agi->agi_count);
3985 ifree += be32_to_cpu(agi->agi_freecount);
3986 xfs_buf_relse(agibp);
3987 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003988 }
3989
3990 sbbp = xfs_getsb(mp, 0);
3991#ifdef XFS_LOUD_RECOVERY
3992 sbp = &mp->m_sb;
Christoph Hellwig2bdf7cd2007-08-28 13:58:06 +10003993 xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(sbbp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003994 cmn_err(CE_NOTE,
3995 "xlog_recover_check_summary: sb_icount %Lu itotal %Lu",
3996 sbp->sb_icount, itotal);
3997 cmn_err(CE_NOTE,
3998 "xlog_recover_check_summary: sb_ifree %Lu itotal %Lu",
3999 sbp->sb_ifree, ifree);
4000 cmn_err(CE_NOTE,
4001 "xlog_recover_check_summary: sb_fdblocks %Lu freeblks %Lu",
4002 sbp->sb_fdblocks, freeblks);
4003#if 0
4004 /*
4005 * This is turned off until I account for the allocation
4006 * btree blocks which live in free space.
4007 */
4008 ASSERT(sbp->sb_icount == itotal);
4009 ASSERT(sbp->sb_ifree == ifree);
4010 ASSERT(sbp->sb_fdblocks == freeblks);
4011#endif
4012#endif
4013 xfs_buf_relse(sbbp);
4014}
4015#endif /* DEBUG */