blob: d8f5d4cbe8b7b7819bb403e225389c54c22fd8b5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * 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"
Nathan Scotta844f452005-11-02 14:38:42 +110027#include "xfs_dir2.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "xfs_dmapi.h"
29#include "xfs_mount.h"
30#include "xfs_error.h"
31#include "xfs_log_priv.h"
32#include "xfs_buf_item.h"
Nathan Scotta844f452005-11-02 14:38:42 +110033#include "xfs_bmap_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_alloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110035#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_log_recover.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_trans_priv.h"
Nathan Scotta844f452005-11-02 14:38:42 +110038#include "xfs_dir2_sf.h"
39#include "xfs_attr_sf.h"
40#include "xfs_dinode.h"
41#include "xfs_inode.h"
42#include "xfs_rw.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44
45#define xlog_write_adv_cnt(ptr, len, off, bytes) \
46 { (ptr) += (bytes); \
47 (len) -= (bytes); \
48 (off) += (bytes);}
49
50/* Local miscellaneous function prototypes */
51STATIC int xlog_bdstrat_cb(struct xfs_buf *);
52STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket,
53 xlog_in_core_t **, xfs_lsn_t *);
54STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp,
55 xfs_buftarg_t *log_target,
56 xfs_daddr_t blk_offset,
57 int num_bblks);
58STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes);
59STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog);
Nathan Scottc41564b2006-03-29 08:55:14 +100060STATIC void xlog_dealloc_log(xlog_t *log);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[],
62 int nentries, xfs_log_ticket_t tic,
63 xfs_lsn_t *start_lsn,
64 xlog_in_core_t **commit_iclog,
65 uint flags);
66
67/* local state machine functions */
68STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int);
69STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog);
70STATIC int xlog_state_get_iclog_space(xlog_t *log,
71 int len,
72 xlog_in_core_t **iclog,
73 xlog_ticket_t *ticket,
74 int *continued_write,
75 int *logoffsetp);
76STATIC void xlog_state_put_ticket(xlog_t *log,
77 xlog_ticket_t *tic);
78STATIC int xlog_state_release_iclog(xlog_t *log,
79 xlog_in_core_t *iclog);
80STATIC void xlog_state_switch_iclogs(xlog_t *log,
81 xlog_in_core_t *iclog,
82 int eventual_size);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +110083STATIC int xlog_state_sync(xlog_t *log,
84 xfs_lsn_t lsn,
85 uint flags,
86 int *log_flushed);
87STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog);
89
90/* local functions to manipulate grant head */
91STATIC int xlog_grant_log_space(xlog_t *log,
92 xlog_ticket_t *xtic);
93STATIC void xlog_grant_push_ail(xfs_mount_t *mp,
94 int need_bytes);
95STATIC void xlog_regrant_reserve_log_space(xlog_t *log,
96 xlog_ticket_t *ticket);
97STATIC int xlog_regrant_write_log_space(xlog_t *log,
98 xlog_ticket_t *ticket);
99STATIC void xlog_ungrant_log_space(xlog_t *log,
100 xlog_ticket_t *ticket);
101
102
103/* local ticket functions */
104STATIC void xlog_state_ticket_alloc(xlog_t *log);
105STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log,
106 int unit_bytes,
107 int count,
108 char clientid,
109 uint flags);
110STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket);
111
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100112#if defined(DEBUG)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr);
114STATIC void xlog_verify_grant_head(xlog_t *log, int equals);
115STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog,
116 int count, boolean_t syncing);
117STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
118 xfs_lsn_t tail_lsn);
119#else
120#define xlog_verify_dest_ptr(a,b)
121#define xlog_verify_grant_head(a,b)
122#define xlog_verify_iclog(a,b,c,d)
123#define xlog_verify_tail_lsn(a,b,c)
124#endif
125
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000126STATIC int xlog_iclogs_empty(xlog_t *log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#if defined(XFS_LOG_TRACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129void
130xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
131{
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000132 unsigned long cnts;
133
134 if (!log->l_grant_trace) {
135 log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP);
136 if (!log->l_grant_trace)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return;
138 }
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000139 /* ticket counts are 1 byte each */
140 cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 ktrace_enter(log->l_grant_trace,
143 (void *)tic,
144 (void *)log->l_reserve_headq,
145 (void *)log->l_write_headq,
146 (void *)((unsigned long)log->l_grant_reserve_cycle),
147 (void *)((unsigned long)log->l_grant_reserve_bytes),
148 (void *)((unsigned long)log->l_grant_write_cycle),
149 (void *)((unsigned long)log->l_grant_write_bytes),
150 (void *)((unsigned long)log->l_curr_cycle),
151 (void *)((unsigned long)log->l_curr_block),
152 (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)),
153 (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)),
154 (void *)string,
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000155 (void *)((unsigned long)tic->t_trans_type),
156 (void *)cnts,
157 (void *)((unsigned long)tic->t_curr_res),
158 (void *)((unsigned long)tic->t_unit_res));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
160
161void
162xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
163{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (!iclog->ic_trace)
165 iclog->ic_trace = ktrace_alloc(256, KM_SLEEP);
166 ktrace_enter(iclog->ic_trace,
167 (void *)((unsigned long)state),
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100168 (void *)((unsigned long)current_pid()),
169 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
170 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
171 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
172 (void *)NULL, (void *)NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174#else
175#define xlog_trace_loggrant(log,tic,string)
176#define xlog_trace_iclog(iclog,state)
177#endif /* XFS_LOG_TRACE */
178
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100179
180static void
181xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic)
182{
183 if (*qp) {
184 tic->t_next = (*qp);
185 tic->t_prev = (*qp)->t_prev;
186 (*qp)->t_prev->t_next = tic;
187 (*qp)->t_prev = tic;
188 } else {
189 tic->t_prev = tic->t_next = tic;
190 *qp = tic;
191 }
192
193 tic->t_flags |= XLOG_TIC_IN_Q;
194}
195
196static void
197xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic)
198{
199 if (tic == tic->t_next) {
200 *qp = NULL;
201 } else {
202 *qp = tic->t_next;
203 tic->t_next->t_prev = tic->t_prev;
204 tic->t_prev->t_next = tic->t_next;
205 }
206
207 tic->t_next = tic->t_prev = NULL;
208 tic->t_flags &= ~XLOG_TIC_IN_Q;
209}
210
211static void
212xlog_grant_sub_space(struct log *log, int bytes)
213{
214 log->l_grant_write_bytes -= bytes;
215 if (log->l_grant_write_bytes < 0) {
216 log->l_grant_write_bytes += log->l_logsize;
217 log->l_grant_write_cycle--;
218 }
219
220 log->l_grant_reserve_bytes -= bytes;
221 if ((log)->l_grant_reserve_bytes < 0) {
222 log->l_grant_reserve_bytes += log->l_logsize;
223 log->l_grant_reserve_cycle--;
224 }
225
226}
227
228static void
229xlog_grant_add_space_write(struct log *log, int bytes)
230{
231 log->l_grant_write_bytes += bytes;
232 if (log->l_grant_write_bytes > log->l_logsize) {
233 log->l_grant_write_bytes -= log->l_logsize;
234 log->l_grant_write_cycle++;
235 }
236}
237
238static void
239xlog_grant_add_space_reserve(struct log *log, int bytes)
240{
241 log->l_grant_reserve_bytes += bytes;
242 if (log->l_grant_reserve_bytes > log->l_logsize) {
243 log->l_grant_reserve_bytes -= log->l_logsize;
244 log->l_grant_reserve_cycle++;
245 }
246}
247
248static inline void
249xlog_grant_add_space(struct log *log, int bytes)
250{
251 xlog_grant_add_space_write(log, bytes);
252 xlog_grant_add_space_reserve(log, bytes);
253}
254
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256/*
257 * NOTES:
258 *
259 * 1. currblock field gets updated at startup and after in-core logs
260 * marked as with WANT_SYNC.
261 */
262
263/*
264 * This routine is called when a user of a log manager ticket is done with
265 * the reservation. If the ticket was ever used, then a commit record for
266 * the associated transaction is written out as a log operation header with
267 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with
268 * a given ticket. If the ticket was one with a permanent reservation, then
269 * a few operations are done differently. Permanent reservation tickets by
270 * default don't release the reservation. They just commit the current
271 * transaction with the belief that the reservation is still needed. A flag
272 * must be passed in before permanent reservations are actually released.
273 * When these type of tickets are not released, they need to be set into
274 * the inited state again. By doing this, a start record will be written
275 * out when the next write occurs.
276 */
277xfs_lsn_t
278xfs_log_done(xfs_mount_t *mp,
279 xfs_log_ticket_t xtic,
280 void **iclog,
281 uint flags)
282{
283 xlog_t *log = mp->m_log;
284 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic;
285 xfs_lsn_t lsn = 0;
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 if (XLOG_FORCED_SHUTDOWN(log) ||
288 /*
289 * If nothing was ever written, don't write out commit record.
290 * If we get an error, just continue and give back the log ticket.
291 */
292 (((ticket->t_flags & XLOG_TIC_INITED) == 0) &&
293 (xlog_commit_record(mp, ticket,
294 (xlog_in_core_t **)iclog, &lsn)))) {
295 lsn = (xfs_lsn_t) -1;
296 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) {
297 flags |= XFS_LOG_REL_PERM_RESERV;
298 }
299 }
300
301
302 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 ||
303 (flags & XFS_LOG_REL_PERM_RESERV)) {
304 /*
Nathan Scottc41564b2006-03-29 08:55:14 +1000305 * Release ticket if not permanent reservation or a specific
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 * request has been made to release a permanent reservation.
307 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000308 xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 xlog_ungrant_log_space(log, ticket);
310 xlog_state_put_ticket(log, ticket);
311 } else {
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000312 xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 xlog_regrant_reserve_log_space(log, ticket);
314 }
315
316 /* If this ticket was a permanent reservation and we aren't
317 * trying to release it, reset the inited flags; so next time
318 * we write, a start record will be written out.
319 */
320 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) &&
321 (flags & XFS_LOG_REL_PERM_RESERV) == 0)
322 ticket->t_flags |= XLOG_TIC_INITED;
323
324 return lsn;
325} /* xfs_log_done */
326
327
328/*
329 * Force the in-core log to disk. If flags == XFS_LOG_SYNC,
330 * the force is done synchronously.
331 *
332 * Asynchronous forces are implemented by setting the WANT_SYNC
333 * bit in the appropriate in-core log and then returning.
334 *
335 * Synchronous forces are implemented with a semaphore. All callers
336 * to force a given lsn to disk will wait on a semaphore attached to the
337 * specific in-core log. When given in-core log finally completes its
338 * write to disk, that thread will wake up all threads waiting on the
339 * semaphore.
340 */
341int
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100342_xfs_log_force(
343 xfs_mount_t *mp,
344 xfs_lsn_t lsn,
345 uint flags,
346 int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100348 xlog_t *log = mp->m_log;
349 int dummy;
350
351 if (!log_flushed)
352 log_flushed = &dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 ASSERT(flags & XFS_LOG_FORCE);
355
356 XFS_STATS_INC(xs_log_force);
357
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100358 if (log->l_flags & XLOG_IO_ERROR)
359 return XFS_ERROR(EIO);
360 if (lsn == 0)
361 return xlog_state_sync_all(log, flags, log_flushed);
362 else
363 return xlog_state_sync(log, lsn, flags, log_flushed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364} /* xfs_log_force */
365
366/*
367 * Attaches a new iclog I/O completion callback routine during
368 * transaction commit. If the log is in error state, a non-zero
369 * return code is handed back and the caller is responsible for
370 * executing the callback at an appropriate time.
371 */
372int
373xfs_log_notify(xfs_mount_t *mp, /* mount of partition */
374 void *iclog_hndl, /* iclog to hang callback off */
375 xfs_log_callback_t *cb)
376{
377 xlog_t *log = mp->m_log;
378 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
379 int abortflg, spl;
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 cb->cb_next = NULL;
382 spl = LOG_LOCK(log);
383 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR);
384 if (!abortflg) {
385 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) ||
386 (iclog->ic_state == XLOG_STATE_WANT_SYNC));
387 cb->cb_next = NULL;
388 *(iclog->ic_callback_tail) = cb;
389 iclog->ic_callback_tail = &(cb->cb_next);
390 }
391 LOG_UNLOCK(log, spl);
392 return abortflg;
393} /* xfs_log_notify */
394
395int
396xfs_log_release_iclog(xfs_mount_t *mp,
397 void *iclog_hndl)
398{
399 xlog_t *log = mp->m_log;
400 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
401
402 if (xlog_state_release_iclog(log, iclog)) {
Nathan Scott7d04a332006-06-09 14:58:38 +1000403 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Jesper Juhl014c2542006-01-15 02:37:08 +0100404 return EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
406
407 return 0;
408}
409
410/*
411 * 1. Reserve an amount of on-disk log space and return a ticket corresponding
412 * to the reservation.
413 * 2. Potentially, push buffers at tail of log to disk.
414 *
415 * Each reservation is going to reserve extra space for a log record header.
416 * When writes happen to the on-disk log, we don't subtract the length of the
417 * log record header from any reservation. By wasting space in each
418 * reservation, we prevent over allocation problems.
419 */
420int
421xfs_log_reserve(xfs_mount_t *mp,
422 int unit_bytes,
423 int cnt,
424 xfs_log_ticket_t *ticket,
425 __uint8_t client,
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000426 uint flags,
427 uint t_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
429 xlog_t *log = mp->m_log;
430 xlog_ticket_t *internal_ticket;
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100431 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG);
434 ASSERT((flags & XFS_LOG_NOSLEEP) == 0);
435
436 if (XLOG_FORCED_SHUTDOWN(log))
437 return XFS_ERROR(EIO);
438
439 XFS_STATS_INC(xs_try_logspace);
440
441 if (*ticket != NULL) {
442 ASSERT(flags & XFS_LOG_PERM_RESERV);
443 internal_ticket = (xlog_ticket_t *)*ticket;
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000444 xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 xlog_grant_push_ail(mp, internal_ticket->t_unit_res);
446 retval = xlog_regrant_write_log_space(log, internal_ticket);
447 } else {
448 /* may sleep if need to allocate more tickets */
449 internal_ticket = xlog_ticket_get(log, unit_bytes, cnt,
450 client, flags);
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000451 internal_ticket->t_trans_type = t_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 *ticket = internal_ticket;
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000453 xlog_trace_loggrant(log, internal_ticket,
454 (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ?
455 "xfs_log_reserve: create new ticket (permanent trans)" :
456 "xfs_log_reserve: create new ticket");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 xlog_grant_push_ail(mp,
458 (internal_ticket->t_unit_res *
459 internal_ticket->t_cnt));
460 retval = xlog_grant_log_space(log, internal_ticket);
461 }
462
463 return retval;
464} /* xfs_log_reserve */
465
466
467/*
468 * Mount a log filesystem
469 *
470 * mp - ubiquitous xfs mount point structure
471 * log_target - buftarg of on-disk log device
472 * blk_offset - Start block # where block size is 512 bytes (BBSIZE)
473 * num_bblocks - Number of BBSIZE blocks in on-disk log
474 *
475 * Return error or zero.
476 */
477int
478xfs_log_mount(xfs_mount_t *mp,
479 xfs_buftarg_t *log_target,
480 xfs_daddr_t blk_offset,
481 int num_bblks)
482{
483 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
484 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname);
485 else {
486 cmn_err(CE_NOTE,
487 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.",
488 mp->m_fsname);
489 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY);
490 }
491
492 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 /*
495 * skip log recovery on a norecovery mount. pretend it all
496 * just worked.
497 */
498 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) {
Nathan Scottb83bd132006-06-09 16:48:30 +1000499 bhv_vfs_t *vfsp = XFS_MTOVFS(mp);
500 int error, readonly = (vfsp->vfs_flag & VFS_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502 if (readonly)
503 vfsp->vfs_flag &= ~VFS_RDONLY;
504
Eric Sandeen65be6052006-01-11 15:34:19 +1100505 error = xlog_recover(mp->m_log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 if (readonly)
508 vfsp->vfs_flag |= VFS_RDONLY;
509 if (error) {
510 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error);
Nathan Scottc41564b2006-03-29 08:55:14 +1000511 xlog_dealloc_log(mp->m_log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 return error;
513 }
514 }
515
516 /* Normal transactions can now occur */
517 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
518
519 /* End mounting message in xfs_log_mount_finish */
520 return 0;
521} /* xfs_log_mount */
522
523/*
524 * Finish the recovery of the file system. This is separate from
525 * the xfs_log_mount() call, because it depends on the code in
526 * xfs_mountfs() to read in the root and real-time bitmap inodes
527 * between calling xfs_log_mount() and here.
528 *
529 * mp - ubiquitous xfs mount point structure
530 */
531int
532xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags)
533{
534 int error;
535
536 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
537 error = xlog_recover_finish(mp->m_log, mfsi_flags);
538 else {
539 error = 0;
540 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY);
541 }
542
543 return error;
544}
545
546/*
547 * Unmount processing for the log.
548 */
549int
550xfs_log_unmount(xfs_mount_t *mp)
551{
552 int error;
553
554 error = xfs_log_unmount_write(mp);
555 xfs_log_unmount_dealloc(mp);
Jesper Juhl014c2542006-01-15 02:37:08 +0100556 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
559/*
560 * Final log writes as part of unmount.
561 *
562 * Mark the filesystem clean as unmount happens. Note that during relocation
563 * this routine needs to be executed as part of source-bag while the
564 * deallocation must not be done until source-end.
565 */
566
567/*
568 * Unmount record used to have a string "Unmount filesystem--" in the
569 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
570 * We just write the magic number now since that particular field isn't
571 * currently architecture converted and "nUmount" is a bit foo.
572 * As far as I know, there weren't any dependencies on the old behaviour.
573 */
574
575int
576xfs_log_unmount_write(xfs_mount_t *mp)
577{
578 xlog_t *log = mp->m_log;
579 xlog_in_core_t *iclog;
580#ifdef DEBUG
581 xlog_in_core_t *first_iclog;
582#endif
583 xfs_log_iovec_t reg[1];
584 xfs_log_ticket_t tic = NULL;
585 xfs_lsn_t lsn;
586 int error;
587 SPLDECL(s);
588
589 /* the data section must be 32 bit size aligned */
590 struct {
591 __uint16_t magic;
592 __uint16_t pad1;
593 __uint32_t pad2; /* may as well make it 64 bits */
594 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 };
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 /*
597 * Don't write out unmount record on read-only mounts.
598 * Or, if we are doing a forced umount (typically because of IO errors).
599 */
600 if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
601 return 0;
602
603 xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC);
604
605#ifdef DEBUG
606 first_iclog = iclog = log->l_iclog;
607 do {
608 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
609 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE);
610 ASSERT(iclog->ic_offset == 0);
611 }
612 iclog = iclog->ic_next;
613 } while (iclog != first_iclog);
614#endif
615 if (! (XLOG_FORCED_SHUTDOWN(log))) {
616 reg[0].i_addr = (void*)&magic;
617 reg[0].i_len = sizeof(magic);
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000618 XLOG_VEC_SET_TYPE(&reg[0], XLOG_REG_TYPE_UNMOUNT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000620 error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 if (!error) {
622 /* remove inited flag */
623 ((xlog_ticket_t *)tic)->t_flags = 0;
624 error = xlog_write(mp, reg, 1, tic, &lsn,
625 NULL, XLOG_UNMOUNT_TRANS);
626 /*
627 * At this point, we're umounting anyway,
628 * so there's no point in transitioning log state
629 * to IOERROR. Just continue...
630 */
631 }
632
633 if (error) {
634 xfs_fs_cmn_err(CE_ALERT, mp,
635 "xfs_log_unmount: unmount record failed");
636 }
637
638
639 s = LOG_LOCK(log);
640 iclog = log->l_iclog;
641 iclog->ic_refcnt++;
642 LOG_UNLOCK(log, s);
643 xlog_state_want_sync(log, iclog);
644 (void) xlog_state_release_iclog(log, iclog);
645
646 s = LOG_LOCK(log);
647 if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
648 iclog->ic_state == XLOG_STATE_DIRTY)) {
649 if (!XLOG_FORCED_SHUTDOWN(log)) {
650 sv_wait(&iclog->ic_forcesema, PMEM,
651 &log->l_icloglock, s);
652 } else {
653 LOG_UNLOCK(log, s);
654 }
655 } else {
656 LOG_UNLOCK(log, s);
657 }
658 if (tic)
659 xlog_state_put_ticket(log, tic);
660 } else {
661 /*
662 * We're already in forced_shutdown mode, couldn't
663 * even attempt to write out the unmount transaction.
664 *
665 * Go through the motions of sync'ing and releasing
666 * the iclog, even though no I/O will actually happen,
Nathan Scottc41564b2006-03-29 08:55:14 +1000667 * we need to wait for other log I/Os that may already
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 * be in progress. Do this as a separate section of
669 * code so we'll know if we ever get stuck here that
670 * we're in this odd situation of trying to unmount
671 * a file system that went into forced_shutdown as
672 * the result of an unmount..
673 */
674 s = LOG_LOCK(log);
675 iclog = log->l_iclog;
676 iclog->ic_refcnt++;
677 LOG_UNLOCK(log, s);
678
679 xlog_state_want_sync(log, iclog);
680 (void) xlog_state_release_iclog(log, iclog);
681
682 s = LOG_LOCK(log);
683
684 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE
685 || iclog->ic_state == XLOG_STATE_DIRTY
686 || iclog->ic_state == XLOG_STATE_IOERROR) ) {
687
688 sv_wait(&iclog->ic_forcesema, PMEM,
689 &log->l_icloglock, s);
690 } else {
691 LOG_UNLOCK(log, s);
692 }
693 }
694
695 return 0;
696} /* xfs_log_unmount_write */
697
698/*
699 * Deallocate log structures for unmount/relocation.
700 */
701void
702xfs_log_unmount_dealloc(xfs_mount_t *mp)
703{
Nathan Scottc41564b2006-03-29 08:55:14 +1000704 xlog_dealloc_log(mp->m_log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705}
706
707/*
708 * Write region vectors to log. The write happens using the space reservation
709 * of the ticket (tic). It is not a requirement that all writes for a given
710 * transaction occur with one call to xfs_log_write().
711 */
712int
713xfs_log_write(xfs_mount_t * mp,
714 xfs_log_iovec_t reg[],
715 int nentries,
716 xfs_log_ticket_t tic,
717 xfs_lsn_t *start_lsn)
718{
719 int error;
720 xlog_t *log = mp->m_log;
721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 if (XLOG_FORCED_SHUTDOWN(log))
723 return XFS_ERROR(EIO);
724
725 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) {
Nathan Scott7d04a332006-06-09 14:58:38 +1000726 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 }
Jesper Juhl014c2542006-01-15 02:37:08 +0100728 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729} /* xfs_log_write */
730
731
732void
733xfs_log_move_tail(xfs_mount_t *mp,
734 xfs_lsn_t tail_lsn)
735{
736 xlog_ticket_t *tic;
737 xlog_t *log = mp->m_log;
738 int need_bytes, free_bytes, cycle, bytes;
739 SPLDECL(s);
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 if (XLOG_FORCED_SHUTDOWN(log))
742 return;
743 ASSERT(!XFS_FORCED_SHUTDOWN(mp));
744
745 if (tail_lsn == 0) {
746 /* needed since sync_lsn is 64 bits */
747 s = LOG_LOCK(log);
748 tail_lsn = log->l_last_sync_lsn;
749 LOG_UNLOCK(log, s);
750 }
751
752 s = GRANT_LOCK(log);
753
754 /* Also an invalid lsn. 1 implies that we aren't passing in a valid
755 * tail_lsn.
756 */
757 if (tail_lsn != 1) {
758 log->l_tail_lsn = tail_lsn;
759 }
760
761 if ((tic = log->l_write_headq)) {
762#ifdef DEBUG
763 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
764 panic("Recovery problem");
765#endif
766 cycle = log->l_grant_write_cycle;
767 bytes = log->l_grant_write_bytes;
768 free_bytes = xlog_space_left(log, cycle, bytes);
769 do {
770 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
771
772 if (free_bytes < tic->t_unit_res && tail_lsn != 1)
773 break;
774 tail_lsn = 0;
775 free_bytes -= tic->t_unit_res;
776 sv_signal(&tic->t_sema);
777 tic = tic->t_next;
778 } while (tic != log->l_write_headq);
779 }
780 if ((tic = log->l_reserve_headq)) {
781#ifdef DEBUG
782 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
783 panic("Recovery problem");
784#endif
785 cycle = log->l_grant_reserve_cycle;
786 bytes = log->l_grant_reserve_bytes;
787 free_bytes = xlog_space_left(log, cycle, bytes);
788 do {
789 if (tic->t_flags & XLOG_TIC_PERM_RESERV)
790 need_bytes = tic->t_unit_res*tic->t_cnt;
791 else
792 need_bytes = tic->t_unit_res;
793 if (free_bytes < need_bytes && tail_lsn != 1)
794 break;
795 tail_lsn = 0;
796 free_bytes -= need_bytes;
797 sv_signal(&tic->t_sema);
798 tic = tic->t_next;
799 } while (tic != log->l_reserve_headq);
800 }
801 GRANT_UNLOCK(log, s);
802} /* xfs_log_move_tail */
803
804/*
805 * Determine if we have a transaction that has gone to disk
806 * that needs to be covered. Log activity needs to be idle (no AIL and
807 * nothing in the iclogs). And, we need to be in the right state indicating
808 * something has gone out.
809 */
810int
811xfs_log_need_covered(xfs_mount_t *mp)
812{
813 SPLDECL(s);
814 int needed = 0, gen;
815 xlog_t *log = mp->m_log;
Nathan Scottb83bd132006-06-09 16:48:30 +1000816 bhv_vfs_t *vfsp = XFS_MTOVFS(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
Nathan Scott34327e12006-06-09 17:11:55 +1000818 if (vfs_test_for_freeze(vfsp) || XFS_FORCED_SHUTDOWN(mp) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 (vfsp->vfs_flag & VFS_RDONLY))
820 return 0;
821
822 s = LOG_LOCK(log);
823 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) ||
824 (log->l_covered_state == XLOG_STATE_COVER_NEED2))
825 && !xfs_trans_first_ail(mp, &gen)
826 && xlog_iclogs_empty(log)) {
827 if (log->l_covered_state == XLOG_STATE_COVER_NEED)
828 log->l_covered_state = XLOG_STATE_COVER_DONE;
829 else {
830 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2);
831 log->l_covered_state = XLOG_STATE_COVER_DONE2;
832 }
833 needed = 1;
834 }
835 LOG_UNLOCK(log, s);
Jesper Juhl014c2542006-01-15 02:37:08 +0100836 return needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837}
838
839/******************************************************************************
840 *
841 * local routines
842 *
843 ******************************************************************************
844 */
845
846/* xfs_trans_tail_ail returns 0 when there is nothing in the list.
847 * The log manager must keep track of the last LR which was committed
848 * to disk. The lsn of this LR will become the new tail_lsn whenever
849 * xfs_trans_tail_ail returns 0. If we don't do this, we run into
850 * the situation where stuff could be written into the log but nothing
851 * was ever in the AIL when asked. Eventually, we panic since the
852 * tail hits the head.
853 *
854 * We may be holding the log iclog lock upon entering this routine.
855 */
856xfs_lsn_t
857xlog_assign_tail_lsn(xfs_mount_t *mp)
858{
859 xfs_lsn_t tail_lsn;
860 SPLDECL(s);
861 xlog_t *log = mp->m_log;
862
863 tail_lsn = xfs_trans_tail_ail(mp);
864 s = GRANT_LOCK(log);
865 if (tail_lsn != 0) {
866 log->l_tail_lsn = tail_lsn;
867 } else {
868 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn;
869 }
870 GRANT_UNLOCK(log, s);
871
872 return tail_lsn;
873} /* xlog_assign_tail_lsn */
874
875
876/*
877 * Return the space in the log between the tail and the head. The head
878 * is passed in the cycle/bytes formal parms. In the special case where
879 * the reserve head has wrapped passed the tail, this calculation is no
880 * longer valid. In this case, just return 0 which means there is no space
881 * in the log. This works for all places where this function is called
882 * with the reserve head. Of course, if the write head were to ever
883 * wrap the tail, we should blow up. Rather than catch this case here,
884 * we depend on other ASSERTions in other parts of the code. XXXmiken
885 *
886 * This code also handles the case where the reservation head is behind
887 * the tail. The details of this case are described below, but the end
888 * result is that we return the size of the log as the amount of space left.
889 */
890int
891xlog_space_left(xlog_t *log, int cycle, int bytes)
892{
893 int free_bytes;
894 int tail_bytes;
895 int tail_cycle;
896
897 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn));
898 tail_cycle = CYCLE_LSN(log->l_tail_lsn);
899 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) {
900 free_bytes = log->l_logsize - (bytes - tail_bytes);
901 } else if ((tail_cycle + 1) < cycle) {
902 return 0;
903 } else if (tail_cycle < cycle) {
904 ASSERT(tail_cycle == (cycle - 1));
905 free_bytes = tail_bytes - bytes;
906 } else {
907 /*
908 * The reservation head is behind the tail.
909 * In this case we just want to return the size of the
910 * log as the amount of space left.
911 */
912 xfs_fs_cmn_err(CE_ALERT, log->l_mp,
913 "xlog_space_left: head behind tail\n"
914 " tail_cycle = %d, tail_bytes = %d\n"
915 " GH cycle = %d, GH bytes = %d",
916 tail_cycle, tail_bytes, cycle, bytes);
917 ASSERT(0);
918 free_bytes = log->l_logsize;
919 }
920 return free_bytes;
921} /* xlog_space_left */
922
923
924/*
925 * Log function which is called when an io completes.
926 *
927 * The log manager needs its own routine, in order to control what
928 * happens with the buffer after the write completes.
929 */
930void
931xlog_iodone(xfs_buf_t *bp)
932{
933 xlog_in_core_t *iclog;
934 xlog_t *l;
935 int aborted;
936
937 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *);
938 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2);
939 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
940 aborted = 0;
941
942 /*
943 * Some versions of cpp barf on the recursive definition of
944 * ic_log -> hic_fields.ic_log and expand ic_log twice when
945 * it is passed through two macros. Workaround broken cpp.
946 */
947 l = iclog->ic_log;
948
949 /*
950 * Race to shutdown the filesystem if we see an error.
951 */
952 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp,
953 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) {
954 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp));
955 XFS_BUF_STALE(bp);
Nathan Scott7d04a332006-06-09 14:58:38 +1000956 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 /*
958 * This flag will be propagated to the trans-committed
959 * callback routines to let them know that the log-commit
960 * didn't succeed.
961 */
962 aborted = XFS_LI_ABORTED;
963 } else if (iclog->ic_state & XLOG_STATE_IOERROR) {
964 aborted = XFS_LI_ABORTED;
965 }
966 xlog_state_done_syncing(iclog, aborted);
967 if (!(XFS_BUF_ISASYNC(bp))) {
968 /*
969 * Corresponding psema() will be done in bwrite(). If we don't
970 * vsema() here, panic.
971 */
972 XFS_BUF_V_IODONESEMA(bp);
973 }
974} /* xlog_iodone */
975
976/*
977 * The bdstrat callback function for log bufs. This gives us a central
978 * place to trap bufs in case we get hit by a log I/O error and need to
979 * shutdown. Actually, in practice, even when we didn't get a log error,
980 * we transition the iclogs to IOERROR state *after* flushing all existing
981 * iclogs to disk. This is because we don't want anymore new transactions to be
982 * started or completed afterwards.
983 */
984STATIC int
985xlog_bdstrat_cb(struct xfs_buf *bp)
986{
987 xlog_in_core_t *iclog;
988
989 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *);
990
991 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) {
992 /* note for irix bstrat will need struct bdevsw passed
993 * Fix the following macro if the code ever is merged
994 */
995 XFS_bdstrat(bp);
996 return 0;
997 }
998
999 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp);
1000 XFS_BUF_ERROR(bp, EIO);
1001 XFS_BUF_STALE(bp);
1002 xfs_biodone(bp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001003 return XFS_ERROR(EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
1005
1006}
1007
1008/*
1009 * Return size of each in-core log record buffer.
1010 *
1011 * Low memory machines only get 2 16KB buffers. We don't want to waste
1012 * memory here. However, all other machines get at least 2 32KB buffers.
1013 * The number is hard coded because we don't care about the minimum
1014 * memory size, just 32MB systems.
1015 *
1016 * If the filesystem blocksize is too large, we may need to choose a
1017 * larger size since the directory code currently logs entire blocks.
1018 */
1019
1020STATIC void
1021xlog_get_iclog_buffer_size(xfs_mount_t *mp,
1022 xlog_t *log)
1023{
1024 int size;
1025 int xhdrs;
1026
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001027 if (mp->m_logbufs <= 0) {
1028 if (xfs_physmem <= btoc(128*1024*1024)) {
1029 log->l_iclog_bufs = XLOG_MIN_ICLOGS;
1030 } else if (xfs_physmem <= btoc(400*1024*1024)) {
1031 log->l_iclog_bufs = XLOG_MED_ICLOGS;
1032 } else { /* 256K with 32K bufs */
1033 log->l_iclog_bufs = XLOG_MAX_ICLOGS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 }
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001035 } else {
1036 log->l_iclog_bufs = mp->m_logbufs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 }
1038
1039 /*
1040 * Buffer size passed in from mount system call.
1041 */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001042 if (mp->m_logbsize > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 size = log->l_iclog_size = mp->m_logbsize;
1044 log->l_iclog_size_log = 0;
1045 while (size != 1) {
1046 log->l_iclog_size_log++;
1047 size >>= 1;
1048 }
1049
1050 if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) {
1051 /* # headers = size / 32K
1052 * one header holds cycles from 32K of data
1053 */
1054
1055 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE;
1056 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE)
1057 xhdrs++;
1058 log->l_iclog_hsize = xhdrs << BBSHIFT;
1059 log->l_iclog_heads = xhdrs;
1060 } else {
1061 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE);
1062 log->l_iclog_hsize = BBSIZE;
1063 log->l_iclog_heads = 1;
1064 }
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001065 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 }
1067
1068 /*
1069 * Special case machines that have less than 32MB of memory.
1070 * All machines with more memory use 32KB buffers.
1071 */
1072 if (xfs_physmem <= btoc(32*1024*1024)) {
1073 /* Don't change; min configuration */
1074 log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */
1075 log->l_iclog_size_log = XLOG_RECORD_BSHIFT;
1076 } else {
1077 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */
1078 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
1079 }
1080
1081 /* the default log size is 16k or 32k which is one header sector */
1082 log->l_iclog_hsize = BBSIZE;
1083 log->l_iclog_heads = 1;
1084
1085 /*
1086 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use
1087 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers.
1088 */
1089 if (mp->m_sb.sb_blocksize >= 16*1024) {
1090 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE;
1091 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001092 if (mp->m_logbufs <= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 switch (mp->m_sb.sb_blocksize) {
1094 case 16*1024: /* 16 KB */
1095 log->l_iclog_bufs = 3;
1096 break;
1097 case 32*1024: /* 32 KB */
1098 log->l_iclog_bufs = 4;
1099 break;
1100 case 64*1024: /* 64 KB */
1101 log->l_iclog_bufs = 8;
1102 break;
1103 default:
1104 xlog_panic("XFS: Invalid blocksize");
1105 break;
1106 }
1107 }
1108 }
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001109
1110done: /* are we being asked to make the sizes selected above visible? */
1111 if (mp->m_logbufs == 0)
1112 mp->m_logbufs = log->l_iclog_bufs;
1113 if (mp->m_logbsize == 0)
1114 mp->m_logbsize = log->l_iclog_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115} /* xlog_get_iclog_buffer_size */
1116
1117
1118/*
1119 * This routine initializes some of the log structure for a given mount point.
1120 * Its primary purpose is to fill in enough, so recovery can occur. However,
1121 * some other stuff may be filled in too.
1122 */
1123STATIC xlog_t *
1124xlog_alloc_log(xfs_mount_t *mp,
1125 xfs_buftarg_t *log_target,
1126 xfs_daddr_t blk_offset,
1127 int num_bblks)
1128{
1129 xlog_t *log;
1130 xlog_rec_header_t *head;
1131 xlog_in_core_t **iclogp;
1132 xlog_in_core_t *iclog, *prev_iclog=NULL;
1133 xfs_buf_t *bp;
1134 int i;
1135 int iclogsize;
1136
1137 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP);
1138
1139 log->l_mp = mp;
1140 log->l_targ = log_target;
1141 log->l_logsize = BBTOB(num_bblks);
1142 log->l_logBBstart = blk_offset;
1143 log->l_logBBsize = num_bblks;
1144 log->l_covered_state = XLOG_STATE_COVER_IDLE;
1145 log->l_flags |= XLOG_ACTIVE_RECOVERY;
1146
1147 log->l_prev_block = -1;
1148 ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0);
1149 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
1150 log->l_last_sync_lsn = log->l_tail_lsn;
1151 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */
1152 log->l_grant_reserve_cycle = 1;
1153 log->l_grant_write_cycle = 1;
1154
1155 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) {
1156 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
1157 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log);
1158 /* for larger sector sizes, must have v2 or external log */
1159 ASSERT(log->l_sectbb_log == 0 ||
1160 log->l_logBBstart == 0 ||
1161 XFS_SB_VERSION_HASLOGV2(&mp->m_sb));
1162 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
1163 }
1164 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1;
1165
1166 xlog_get_iclog_buffer_size(mp, log);
1167
1168 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp);
1169 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone);
1170 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb);
1171 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
1172 ASSERT(XFS_BUF_ISBUSY(bp));
1173 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
1174 log->l_xbuf = bp;
1175
1176 spinlock_init(&log->l_icloglock, "iclog");
1177 spinlock_init(&log->l_grant_lock, "grhead_iclog");
1178 initnsema(&log->l_flushsema, 0, "ic-flush");
1179 xlog_state_ticket_alloc(log); /* wait until after icloglock inited */
1180
1181 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
1182 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
1183
1184 iclogp = &log->l_iclog;
1185 /*
1186 * The amount of memory to allocate for the iclog structure is
1187 * rather funky due to the way the structure is defined. It is
1188 * done this way so that we can use different sizes for machines
1189 * with different amounts of memory. See the definition of
1190 * xlog_in_core_t in xfs_log_priv.h for details.
1191 */
1192 iclogsize = log->l_iclog_size;
1193 ASSERT(log->l_iclog_size >= 4096);
1194 for (i=0; i < log->l_iclog_bufs; i++) {
1195 *iclogp = (xlog_in_core_t *)
1196 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP);
1197 iclog = *iclogp;
1198 iclog->hic_data = (xlog_in_core_2_t *)
1199 kmem_zalloc(iclogsize, KM_SLEEP);
1200
1201 iclog->ic_prev = prev_iclog;
1202 prev_iclog = iclog;
1203 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header);
1204
1205 head = &iclog->ic_header;
1206 memset(head, 0, sizeof(xlog_rec_header_t));
1207 INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM);
1208 INT_SET(head->h_version, ARCH_CONVERT,
1209 XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1);
1210 INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size);
1211 /* new fields */
1212 INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT);
1213 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t));
1214
1215 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp);
1216 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone);
1217 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb);
1218 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
1219 iclog->ic_bp = bp;
1220
1221 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize;
1222 iclog->ic_state = XLOG_STATE_ACTIVE;
1223 iclog->ic_log = log;
1224 iclog->ic_callback_tail = &(iclog->ic_callback);
1225 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize;
1226
1227 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp));
1228 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0);
1229 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force");
1230 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write");
1231
1232 iclogp = &iclog->ic_next;
1233 }
1234 *iclogp = log->l_iclog; /* complete ring */
1235 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */
1236
1237 return log;
1238} /* xlog_alloc_log */
1239
1240
1241/*
1242 * Write out the commit record of a transaction associated with the given
1243 * ticket. Return the lsn of the commit record.
1244 */
1245STATIC int
1246xlog_commit_record(xfs_mount_t *mp,
1247 xlog_ticket_t *ticket,
1248 xlog_in_core_t **iclog,
1249 xfs_lsn_t *commitlsnp)
1250{
1251 int error;
1252 xfs_log_iovec_t reg[1];
1253
1254 reg[0].i_addr = NULL;
1255 reg[0].i_len = 0;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001256 XLOG_VEC_SET_TYPE(&reg[0], XLOG_REG_TYPE_COMMIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
1258 ASSERT_ALWAYS(iclog);
1259 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp,
1260 iclog, XLOG_COMMIT_TRANS))) {
Nathan Scott7d04a332006-06-09 14:58:38 +10001261 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001263 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264} /* xlog_commit_record */
1265
1266
1267/*
1268 * Push on the buffer cache code if we ever use more than 75% of the on-disk
1269 * log space. This code pushes on the lsn which would supposedly free up
1270 * the 25% which we want to leave free. We may need to adopt a policy which
1271 * pushes on an lsn which is further along in the log once we reach the high
1272 * water mark. In this manner, we would be creating a low water mark.
1273 */
1274void
1275xlog_grant_push_ail(xfs_mount_t *mp,
1276 int need_bytes)
1277{
1278 xlog_t *log = mp->m_log; /* pointer to the log */
1279 xfs_lsn_t tail_lsn; /* lsn of the log tail */
1280 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */
1281 int free_blocks; /* free blocks left to write to */
1282 int free_bytes; /* free bytes left to write to */
1283 int threshold_block; /* block in lsn we'd like to be at */
1284 int threshold_cycle; /* lsn cycle we'd like to be at */
1285 int free_threshold;
1286 SPLDECL(s);
1287
1288 ASSERT(BTOBB(need_bytes) < log->l_logBBsize);
1289
1290 s = GRANT_LOCK(log);
1291 free_bytes = xlog_space_left(log,
1292 log->l_grant_reserve_cycle,
1293 log->l_grant_reserve_bytes);
1294 tail_lsn = log->l_tail_lsn;
1295 free_blocks = BTOBBT(free_bytes);
1296
1297 /*
1298 * Set the threshold for the minimum number of free blocks in the
1299 * log to the maximum of what the caller needs, one quarter of the
1300 * log, and 256 blocks.
1301 */
1302 free_threshold = BTOBB(need_bytes);
1303 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2));
1304 free_threshold = MAX(free_threshold, 256);
1305 if (free_blocks < free_threshold) {
1306 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold;
1307 threshold_cycle = CYCLE_LSN(tail_lsn);
1308 if (threshold_block >= log->l_logBBsize) {
1309 threshold_block -= log->l_logBBsize;
1310 threshold_cycle += 1;
1311 }
1312 ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle,
1313 threshold_block);
1314
1315 /* Don't pass in an lsn greater than the lsn of the last
1316 * log record known to be on disk.
1317 */
1318 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0)
1319 threshold_lsn = log->l_last_sync_lsn;
1320 }
1321 GRANT_UNLOCK(log, s);
1322
1323 /*
1324 * Get the transaction layer to kick the dirty buffers out to
1325 * disk asynchronously. No point in trying to do this if
1326 * the filesystem is shutting down.
1327 */
1328 if (threshold_lsn &&
1329 !XLOG_FORCED_SHUTDOWN(log))
1330 xfs_trans_push_ail(mp, threshold_lsn);
1331} /* xlog_grant_push_ail */
1332
1333
1334/*
1335 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous
1336 * fashion. Previously, we should have moved the current iclog
1337 * ptr in the log to point to the next available iclog. This allows further
1338 * write to continue while this code syncs out an iclog ready to go.
1339 * Before an in-core log can be written out, the data section must be scanned
1340 * to save away the 1st word of each BBSIZE block into the header. We replace
1341 * it with the current cycle count. Each BBSIZE block is tagged with the
1342 * cycle count because there in an implicit assumption that drives will
1343 * guarantee that entire 512 byte blocks get written at once. In other words,
1344 * we can't have part of a 512 byte block written and part not written. By
1345 * tagging each block, we will know which blocks are valid when recovering
1346 * after an unclean shutdown.
1347 *
1348 * This routine is single threaded on the iclog. No other thread can be in
1349 * this routine with the same iclog. Changing contents of iclog can there-
1350 * fore be done without grabbing the state machine lock. Updating the global
1351 * log will require grabbing the lock though.
1352 *
1353 * The entire log manager uses a logical block numbering scheme. Only
1354 * log_sync (and then only bwrite()) know about the fact that the log may
1355 * not start with block zero on a given device. The log block start offset
1356 * is added immediately before calling bwrite().
1357 */
1358
1359int
1360xlog_sync(xlog_t *log,
1361 xlog_in_core_t *iclog)
1362{
1363 xfs_caddr_t dptr; /* pointer to byte sized element */
1364 xfs_buf_t *bp;
1365 int i, ops;
1366 uint count; /* byte count of bwrite */
1367 uint count_init; /* initial count before roundup */
1368 int roundoff; /* roundoff to BB or stripe */
1369 int split = 0; /* split write into two regions */
1370 int error;
1371 SPLDECL(s);
1372 int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb);
1373
1374 XFS_STATS_INC(xs_log_writes);
1375 ASSERT(iclog->ic_refcnt == 0);
1376
1377 /* Add for LR header */
1378 count_init = log->l_iclog_hsize + iclog->ic_offset;
1379
1380 /* Round out the log write size */
1381 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) {
1382 /* we have a v2 stripe unit to use */
1383 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
1384 } else {
1385 count = BBTOB(BTOBB(count_init));
1386 }
1387 roundoff = count - count_init;
1388 ASSERT(roundoff >= 0);
1389 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 &&
1390 roundoff < log->l_mp->m_sb.sb_logsunit)
1391 ||
1392 (log->l_mp->m_sb.sb_logsunit <= 1 &&
1393 roundoff < BBTOB(1)));
1394
1395 /* move grant heads by roundoff in sync */
1396 s = GRANT_LOCK(log);
Christoph Hellwigdd954c62006-01-11 15:34:50 +11001397 xlog_grant_add_space(log, roundoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 GRANT_UNLOCK(log, s);
1399
1400 /* put cycle number in every block */
1401 xlog_pack_data(log, iclog, roundoff);
1402
1403 /* real byte length */
1404 if (v2) {
1405 INT_SET(iclog->ic_header.h_len,
1406 ARCH_CONVERT,
1407 iclog->ic_offset + roundoff);
1408 } else {
1409 INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset);
1410 }
1411
1412 /* put ops count in correct order */
1413 ops = iclog->ic_header.h_num_logops;
1414 INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops);
1415
1416 bp = iclog->ic_bp;
1417 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1);
1418 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2);
1419 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT)));
1420
1421 XFS_STATS_ADD(xs_log_blocks, BTOBB(count));
1422
1423 /* Do we need to split this write into 2 parts? */
1424 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) {
1425 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)));
1426 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp));
1427 iclog->ic_bwritecnt = 2; /* split into 2 writes */
1428 } else {
1429 iclog->ic_bwritecnt = 1;
1430 }
1431 XFS_BUF_SET_PTR(bp, (xfs_caddr_t) &(iclog->ic_header), count);
1432 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */
1433 XFS_BUF_BUSY(bp);
1434 XFS_BUF_ASYNC(bp);
1435 /*
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001436 * Do an ordered write for the log block.
1437 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 * It may not be needed to flush the first split block in the log wrap
1439 * case, but do it anyways to be safe -AK
1440 */
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001441 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
1442 XFS_BUF_ORDERED(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
1444 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1445 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1446
1447 xlog_verify_iclog(log, iclog, count, B_TRUE);
1448
1449 /* account for log which doesn't start at block #0 */
1450 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1451 /*
1452 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem
1453 * is shutting down.
1454 */
1455 XFS_BUF_WRITE(bp);
1456
1457 if ((error = XFS_bwrite(bp))) {
1458 xfs_ioerror_alert("xlog_sync", log->l_mp, bp,
1459 XFS_BUF_ADDR(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001460 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 }
1462 if (split) {
1463 bp = iclog->ic_log->l_xbuf;
1464 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) ==
1465 (unsigned long)1);
1466 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2);
1467 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */
1468 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+
1469 (__psint_t)count), split);
1470 XFS_BUF_SET_FSPRIVATE(bp, iclog);
1471 XFS_BUF_BUSY(bp);
1472 XFS_BUF_ASYNC(bp);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001473 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
1474 XFS_BUF_ORDERED(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 dptr = XFS_BUF_PTR(bp);
1476 /*
1477 * Bump the cycle numbers at the start of each block
1478 * since this part of the buffer is at the start of
1479 * a new cycle. Watch out for the header magic number
1480 * case, though.
1481 */
1482 for (i=0; i<split; i += BBSIZE) {
1483 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1);
1484 if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM)
1485 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1);
1486 dptr += BBSIZE;
1487 }
1488
1489 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1490 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1491
Nathan Scottc41564b2006-03-29 08:55:14 +10001492 /* account for internal log which doesn't start at block #0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1494 XFS_BUF_WRITE(bp);
1495 if ((error = XFS_bwrite(bp))) {
1496 xfs_ioerror_alert("xlog_sync (split)", log->l_mp,
1497 bp, XFS_BUF_ADDR(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001498 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 }
1500 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001501 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502} /* xlog_sync */
1503
1504
1505/*
Nathan Scottc41564b2006-03-29 08:55:14 +10001506 * Deallocate a log structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 */
1508void
Nathan Scottc41564b2006-03-29 08:55:14 +10001509xlog_dealloc_log(xlog_t *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510{
1511 xlog_in_core_t *iclog, *next_iclog;
1512 xlog_ticket_t *tic, *next_tic;
1513 int i;
1514
1515
1516 iclog = log->l_iclog;
1517 for (i=0; i<log->l_iclog_bufs; i++) {
1518 sv_destroy(&iclog->ic_forcesema);
1519 sv_destroy(&iclog->ic_writesema);
1520 xfs_buf_free(iclog->ic_bp);
1521#ifdef XFS_LOG_TRACE
1522 if (iclog->ic_trace != NULL) {
1523 ktrace_free(iclog->ic_trace);
1524 }
1525#endif
1526 next_iclog = iclog->ic_next;
1527 kmem_free(iclog->hic_data, log->l_iclog_size);
1528 kmem_free(iclog, sizeof(xlog_in_core_t));
1529 iclog = next_iclog;
1530 }
1531 freesema(&log->l_flushsema);
1532 spinlock_destroy(&log->l_icloglock);
1533 spinlock_destroy(&log->l_grant_lock);
1534
1535 /* XXXsup take a look at this again. */
1536 if ((log->l_ticket_cnt != log->l_ticket_tcnt) &&
1537 !XLOG_FORCED_SHUTDOWN(log)) {
1538 xfs_fs_cmn_err(CE_WARN, log->l_mp,
Nathan Scottc41564b2006-03-29 08:55:14 +10001539 "xlog_dealloc_log: (cnt: %d, total: %d)",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 log->l_ticket_cnt, log->l_ticket_tcnt);
1541 /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */
1542
1543 } else {
1544 tic = log->l_unmount_free;
1545 while (tic) {
1546 next_tic = tic->t_next;
1547 kmem_free(tic, NBPP);
1548 tic = next_tic;
1549 }
1550 }
1551 xfs_buf_free(log->l_xbuf);
1552#ifdef XFS_LOG_TRACE
1553 if (log->l_trace != NULL) {
1554 ktrace_free(log->l_trace);
1555 }
1556 if (log->l_grant_trace != NULL) {
1557 ktrace_free(log->l_grant_trace);
1558 }
1559#endif
1560 log->l_mp->m_log = NULL;
1561 kmem_free(log, sizeof(xlog_t));
Nathan Scottc41564b2006-03-29 08:55:14 +10001562} /* xlog_dealloc_log */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563
1564/*
1565 * Update counters atomically now that memcpy is done.
1566 */
1567/* ARGSUSED */
1568static inline void
1569xlog_state_finish_copy(xlog_t *log,
1570 xlog_in_core_t *iclog,
1571 int record_cnt,
1572 int copy_bytes)
1573{
1574 SPLDECL(s);
1575
1576 s = LOG_LOCK(log);
1577
1578 iclog->ic_header.h_num_logops += record_cnt;
1579 iclog->ic_offset += copy_bytes;
1580
1581 LOG_UNLOCK(log, s);
1582} /* xlog_state_finish_copy */
1583
1584
1585
1586
1587/*
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001588 * print out info relating to regions written which consume
1589 * the reservation
1590 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001591STATIC void
1592xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket)
1593{
1594 uint i;
1595 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t);
1596
1597 /* match with XLOG_REG_TYPE_* in xfs_log.h */
1598 static char *res_type_str[XLOG_REG_TYPE_MAX] = {
1599 "bformat",
1600 "bchunk",
1601 "efi_format",
1602 "efd_format",
1603 "iformat",
1604 "icore",
1605 "iext",
1606 "ibroot",
1607 "ilocal",
1608 "iattr_ext",
1609 "iattr_broot",
1610 "iattr_local",
1611 "qformat",
1612 "dquot",
1613 "quotaoff",
1614 "LR header",
1615 "unmount",
1616 "commit",
1617 "trans header"
1618 };
1619 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = {
1620 "SETATTR_NOT_SIZE",
1621 "SETATTR_SIZE",
1622 "INACTIVE",
1623 "CREATE",
1624 "CREATE_TRUNC",
1625 "TRUNCATE_FILE",
1626 "REMOVE",
1627 "LINK",
1628 "RENAME",
1629 "MKDIR",
1630 "RMDIR",
1631 "SYMLINK",
1632 "SET_DMATTRS",
1633 "GROWFS",
1634 "STRAT_WRITE",
1635 "DIOSTRAT",
1636 "WRITE_SYNC",
1637 "WRITEID",
1638 "ADDAFORK",
1639 "ATTRINVAL",
1640 "ATRUNCATE",
1641 "ATTR_SET",
1642 "ATTR_RM",
1643 "ATTR_FLAG",
1644 "CLEAR_AGI_BUCKET",
1645 "QM_SBCHANGE",
1646 "DUMMY1",
1647 "DUMMY2",
1648 "QM_QUOTAOFF",
1649 "QM_DQALLOC",
1650 "QM_SETQLIM",
1651 "QM_DQCLUSTER",
1652 "QM_QINOCREATE",
1653 "QM_QUOTAOFF_END",
1654 "SB_UNIT",
1655 "FSYNC_TS",
1656 "GROWFSRT_ALLOC",
1657 "GROWFSRT_ZERO",
1658 "GROWFSRT_FREE",
1659 "SWAPEXT"
1660 };
1661
1662 xfs_fs_cmn_err(CE_WARN, mp,
1663 "xfs_log_write: reservation summary:\n"
1664 " trans type = %s (%u)\n"
1665 " unit res = %d bytes\n"
1666 " current res = %d bytes\n"
1667 " total reg = %u bytes (o/flow = %u bytes)\n"
1668 " ophdrs = %u (ophdr space = %u bytes)\n"
1669 " ophdr + reg = %u bytes\n"
1670 " num regions = %u\n",
1671 ((ticket->t_trans_type <= 0 ||
1672 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ?
1673 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]),
1674 ticket->t_trans_type,
1675 ticket->t_unit_res,
1676 ticket->t_curr_res,
1677 ticket->t_res_arr_sum, ticket->t_res_o_flow,
1678 ticket->t_res_num_ophdrs, ophdr_spc,
1679 ticket->t_res_arr_sum +
Tim Shimmin12598452006-01-11 21:02:47 +11001680 ticket->t_res_o_flow + ophdr_spc,
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001681 ticket->t_res_num);
1682
1683 for (i = 0; i < ticket->t_res_num; i++) {
Tim Shimmin12598452006-01-11 21:02:47 +11001684 uint r_type = ticket->t_res_arr[i].r_type;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001685 cmn_err(CE_WARN,
1686 "region[%u]: %s - %u bytes\n",
1687 i,
1688 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ?
1689 "bad-rtype" : res_type_str[r_type-1]),
1690 ticket->t_res_arr[i].r_len);
1691 }
1692}
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001693
1694/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 * Write some region out to in-core log
1696 *
1697 * This will be called when writing externally provided regions or when
1698 * writing out a commit record for a given transaction.
1699 *
1700 * General algorithm:
1701 * 1. Find total length of this write. This may include adding to the
1702 * lengths passed in.
1703 * 2. Check whether we violate the tickets reservation.
1704 * 3. While writing to this iclog
1705 * A. Reserve as much space in this iclog as can get
1706 * B. If this is first write, save away start lsn
1707 * C. While writing this region:
1708 * 1. If first write of transaction, write start record
1709 * 2. Write log operation header (header per region)
1710 * 3. Find out if we can fit entire region into this iclog
1711 * 4. Potentially, verify destination memcpy ptr
1712 * 5. Memcpy (partial) region
1713 * 6. If partial copy, release iclog; otherwise, continue
1714 * copying more regions into current iclog
1715 * 4. Mark want sync bit (in simulation mode)
1716 * 5. Release iclog for potential flush to on-disk log.
1717 *
1718 * ERRORS:
1719 * 1. Panic if reservation is overrun. This should never happen since
1720 * reservation amounts are generated internal to the filesystem.
1721 * NOTES:
1722 * 1. Tickets are single threaded data structures.
1723 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the
1724 * syncing routine. When a single log_write region needs to span
1725 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set
1726 * on all log operation writes which don't contain the end of the
1727 * region. The XLOG_END_TRANS bit is used for the in-core log
1728 * operation which contains the end of the continued log_write region.
1729 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog,
1730 * we don't really know exactly how much space will be used. As a result,
1731 * we don't update ic_offset until the end when we know exactly how many
1732 * bytes have been written out.
1733 */
1734int
1735xlog_write(xfs_mount_t * mp,
1736 xfs_log_iovec_t reg[],
1737 int nentries,
1738 xfs_log_ticket_t tic,
1739 xfs_lsn_t *start_lsn,
1740 xlog_in_core_t **commit_iclog,
1741 uint flags)
1742{
1743 xlog_t *log = mp->m_log;
1744 xlog_ticket_t *ticket = (xlog_ticket_t *)tic;
1745 xlog_op_header_t *logop_head; /* ptr to log operation header */
1746 xlog_in_core_t *iclog; /* ptr to current in-core log */
1747 __psint_t ptr; /* copy address into data region */
1748 int len; /* # xlog_write() bytes 2 still copy */
1749 int index; /* region index currently copying */
1750 int log_offset; /* offset (from 0) into data region */
1751 int start_rec_copy; /* # bytes to copy for start record */
1752 int partial_copy; /* did we split a region? */
1753 int partial_copy_len;/* # bytes copied if split region */
1754 int need_copy; /* # bytes need to memcpy this region */
1755 int copy_len; /* # bytes actually memcpy'ing */
1756 int copy_off; /* # bytes from entry start */
1757 int contwr; /* continued write of in-core log? */
1758 int error;
1759 int record_cnt = 0, data_cnt = 0;
1760
1761 partial_copy_len = partial_copy = 0;
1762
1763 /* Calculate potential maximum space. Each region gets its own
1764 * xlog_op_header_t and may need to be double word aligned.
1765 */
1766 len = 0;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001767 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 len += sizeof(xlog_op_header_t);
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001769 XLOG_TIC_ADD_OPHDR(ticket);
1770 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771
1772 for (index = 0; index < nentries; index++) {
1773 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001774 XLOG_TIC_ADD_OPHDR(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775 len += reg[index].i_len;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001776 XLOG_TIC_ADD_REGION(ticket, reg[index].i_len, reg[index].i_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 }
1778 contwr = *start_lsn = 0;
1779
1780 if (ticket->t_curr_res < len) {
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001781 xlog_print_tic_res(mp, ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782#ifdef DEBUG
1783 xlog_panic(
1784 "xfs_log_write: reservation ran out. Need to up reservation");
1785#else
1786 /* Customer configurable panic */
1787 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp,
1788 "xfs_log_write: reservation ran out. Need to up reservation");
1789 /* If we did not panic, shutdown the filesystem */
Nathan Scott7d04a332006-06-09 14:58:38 +10001790 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791#endif
1792 } else
1793 ticket->t_curr_res -= len;
1794
1795 for (index = 0; index < nentries; ) {
1796 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket,
1797 &contwr, &log_offset)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001798 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799
1800 ASSERT(log_offset <= iclog->ic_size - 1);
1801 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset);
1802
1803 /* start_lsn is the first lsn written to. That's all we need. */
1804 if (! *start_lsn)
1805 *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT);
1806
1807 /* This loop writes out as many regions as can fit in the amount
1808 * of space which was allocated by xlog_state_get_iclog_space().
1809 */
1810 while (index < nentries) {
1811 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0);
1812 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0);
1813 start_rec_copy = 0;
1814
1815 /* If first write for transaction, insert start record.
1816 * We can't be trying to commit if we are inited. We can't
1817 * have any "partial_copy" if we are inited.
1818 */
1819 if (ticket->t_flags & XLOG_TIC_INITED) {
1820 logop_head = (xlog_op_header_t *)ptr;
1821 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid);
1822 logop_head->oh_clientid = ticket->t_clientid;
1823 logop_head->oh_len = 0;
1824 logop_head->oh_flags = XLOG_START_TRANS;
1825 logop_head->oh_res2 = 0;
1826 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */
1827 record_cnt++;
1828
1829 start_rec_copy = sizeof(xlog_op_header_t);
1830 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy);
1831 }
1832
1833 /* Copy log operation header directly into data section */
1834 logop_head = (xlog_op_header_t *)ptr;
1835 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid);
1836 logop_head->oh_clientid = ticket->t_clientid;
1837 logop_head->oh_res2 = 0;
1838
1839 /* header copied directly */
1840 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t));
1841
1842 /* are we copying a commit or unmount record? */
1843 logop_head->oh_flags = flags;
1844
1845 /*
1846 * We've seen logs corrupted with bad transaction client
1847 * ids. This makes sure that XFS doesn't generate them on.
1848 * Turn this into an EIO and shut down the filesystem.
1849 */
1850 switch (logop_head->oh_clientid) {
1851 case XFS_TRANSACTION:
1852 case XFS_VOLUME:
1853 case XFS_LOG:
1854 break;
1855 default:
1856 xfs_fs_cmn_err(CE_WARN, mp,
1857 "Bad XFS transaction clientid 0x%x in ticket 0x%p",
1858 logop_head->oh_clientid, tic);
1859 return XFS_ERROR(EIO);
1860 }
1861
1862 /* Partial write last time? => (partial_copy != 0)
1863 * need_copy is the amount we'd like to copy if everything could
1864 * fit in the current memcpy.
1865 */
1866 need_copy = reg[index].i_len - partial_copy_len;
1867
1868 copy_off = partial_copy_len;
1869 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */
1870 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy);
1871 if (partial_copy)
1872 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS);
1873 partial_copy_len = partial_copy = 0;
1874 } else { /* partial write */
1875 copy_len = iclog->ic_size - log_offset;
1876 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len);
1877 logop_head->oh_flags |= XLOG_CONTINUE_TRANS;
1878 if (partial_copy)
1879 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS;
1880 partial_copy_len += copy_len;
1881 partial_copy++;
1882 len += sizeof(xlog_op_header_t); /* from splitting of region */
1883 /* account for new log op header */
1884 ticket->t_curr_res -= sizeof(xlog_op_header_t);
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001885 XLOG_TIC_ADD_OPHDR(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 }
1887 xlog_verify_dest_ptr(log, ptr);
1888
1889 /* copy region */
1890 ASSERT(copy_len >= 0);
1891 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len);
1892 xlog_write_adv_cnt(ptr, len, log_offset, copy_len);
1893
1894 /* make copy_len total bytes copied, including headers */
1895 copy_len += start_rec_copy + sizeof(xlog_op_header_t);
1896 record_cnt++;
1897 data_cnt += contwr ? copy_len : 0;
1898 if (partial_copy) { /* copied partial region */
1899 /* already marked WANT_SYNC by xlog_state_get_iclog_space */
1900 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1901 record_cnt = data_cnt = 0;
1902 if ((error = xlog_state_release_iclog(log, iclog)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001903 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 break; /* don't increment index */
1905 } else { /* copied entire region */
1906 index++;
1907 partial_copy_len = partial_copy = 0;
1908
1909 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) {
1910 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1911 record_cnt = data_cnt = 0;
1912 xlog_state_want_sync(log, iclog);
1913 if (commit_iclog) {
1914 ASSERT(flags & XLOG_COMMIT_TRANS);
1915 *commit_iclog = iclog;
1916 } else if ((error = xlog_state_release_iclog(log, iclog)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001917 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 if (index == nentries)
1919 return 0; /* we are done */
1920 else
1921 break;
1922 }
1923 } /* if (partial_copy) */
1924 } /* while (index < nentries) */
1925 } /* for (index = 0; index < nentries; ) */
1926 ASSERT(len == 0);
1927
1928 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1929 if (commit_iclog) {
1930 ASSERT(flags & XLOG_COMMIT_TRANS);
1931 *commit_iclog = iclog;
1932 return 0;
1933 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001934 return xlog_state_release_iclog(log, iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935} /* xlog_write */
1936
1937
1938/*****************************************************************************
1939 *
1940 * State Machine functions
1941 *
1942 *****************************************************************************
1943 */
1944
1945/* Clean iclogs starting from the head. This ordering must be
1946 * maintained, so an iclog doesn't become ACTIVE beyond one that
1947 * is SYNCING. This is also required to maintain the notion that we use
1948 * a counting semaphore to hold off would be writers to the log when every
1949 * iclog is trying to sync to disk.
1950 *
1951 * State Change: DIRTY -> ACTIVE
1952 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001953STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954xlog_state_clean_log(xlog_t *log)
1955{
1956 xlog_in_core_t *iclog;
1957 int changed = 0;
1958
1959 iclog = log->l_iclog;
1960 do {
1961 if (iclog->ic_state == XLOG_STATE_DIRTY) {
1962 iclog->ic_state = XLOG_STATE_ACTIVE;
1963 iclog->ic_offset = 0;
1964 iclog->ic_callback = NULL; /* don't need to free */
1965 /*
1966 * If the number of ops in this iclog indicate it just
1967 * contains the dummy transaction, we can
1968 * change state into IDLE (the second time around).
1969 * Otherwise we should change the state into
1970 * NEED a dummy.
1971 * We don't need to cover the dummy.
1972 */
1973 if (!changed &&
1974 (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) {
1975 changed = 1;
1976 } else {
1977 /*
1978 * We have two dirty iclogs so start over
1979 * This could also be num of ops indicates
1980 * this is not the dummy going out.
1981 */
1982 changed = 2;
1983 }
1984 iclog->ic_header.h_num_logops = 0;
1985 memset(iclog->ic_header.h_cycle_data, 0,
1986 sizeof(iclog->ic_header.h_cycle_data));
1987 iclog->ic_header.h_lsn = 0;
1988 } else if (iclog->ic_state == XLOG_STATE_ACTIVE)
1989 /* do nothing */;
1990 else
1991 break; /* stop cleaning */
1992 iclog = iclog->ic_next;
1993 } while (iclog != log->l_iclog);
1994
1995 /* log is locked when we are called */
1996 /*
1997 * Change state for the dummy log recording.
1998 * We usually go to NEED. But we go to NEED2 if the changed indicates
1999 * we are done writing the dummy record.
2000 * If we are done with the second dummy recored (DONE2), then
2001 * we go to IDLE.
2002 */
2003 if (changed) {
2004 switch (log->l_covered_state) {
2005 case XLOG_STATE_COVER_IDLE:
2006 case XLOG_STATE_COVER_NEED:
2007 case XLOG_STATE_COVER_NEED2:
2008 log->l_covered_state = XLOG_STATE_COVER_NEED;
2009 break;
2010
2011 case XLOG_STATE_COVER_DONE:
2012 if (changed == 1)
2013 log->l_covered_state = XLOG_STATE_COVER_NEED2;
2014 else
2015 log->l_covered_state = XLOG_STATE_COVER_NEED;
2016 break;
2017
2018 case XLOG_STATE_COVER_DONE2:
2019 if (changed == 1)
2020 log->l_covered_state = XLOG_STATE_COVER_IDLE;
2021 else
2022 log->l_covered_state = XLOG_STATE_COVER_NEED;
2023 break;
2024
2025 default:
2026 ASSERT(0);
2027 }
2028 }
2029} /* xlog_state_clean_log */
2030
2031STATIC xfs_lsn_t
2032xlog_get_lowest_lsn(
2033 xlog_t *log)
2034{
2035 xlog_in_core_t *lsn_log;
2036 xfs_lsn_t lowest_lsn, lsn;
2037
2038 lsn_log = log->l_iclog;
2039 lowest_lsn = 0;
2040 do {
2041 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) {
2042 lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT);
2043 if ((lsn && !lowest_lsn) ||
2044 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) {
2045 lowest_lsn = lsn;
2046 }
2047 }
2048 lsn_log = lsn_log->ic_next;
2049 } while (lsn_log != log->l_iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01002050 return lowest_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051}
2052
2053
2054STATIC void
2055xlog_state_do_callback(
2056 xlog_t *log,
2057 int aborted,
2058 xlog_in_core_t *ciclog)
2059{
2060 xlog_in_core_t *iclog;
2061 xlog_in_core_t *first_iclog; /* used to know when we've
2062 * processed all iclogs once */
2063 xfs_log_callback_t *cb, *cb_next;
2064 int flushcnt = 0;
2065 xfs_lsn_t lowest_lsn;
2066 int ioerrors; /* counter: iclogs with errors */
2067 int loopdidcallbacks; /* flag: inner loop did callbacks*/
2068 int funcdidcallbacks; /* flag: function did callbacks */
2069 int repeats; /* for issuing console warnings if
2070 * looping too many times */
2071 SPLDECL(s);
2072
2073 s = LOG_LOCK(log);
2074 first_iclog = iclog = log->l_iclog;
2075 ioerrors = 0;
2076 funcdidcallbacks = 0;
2077 repeats = 0;
2078
2079 do {
2080 /*
2081 * Scan all iclogs starting with the one pointed to by the
2082 * log. Reset this starting point each time the log is
2083 * unlocked (during callbacks).
2084 *
2085 * Keep looping through iclogs until one full pass is made
2086 * without running any callbacks.
2087 */
2088 first_iclog = log->l_iclog;
2089 iclog = log->l_iclog;
2090 loopdidcallbacks = 0;
2091 repeats++;
2092
2093 do {
2094
2095 /* skip all iclogs in the ACTIVE & DIRTY states */
2096 if (iclog->ic_state &
2097 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) {
2098 iclog = iclog->ic_next;
2099 continue;
2100 }
2101
2102 /*
2103 * Between marking a filesystem SHUTDOWN and stopping
2104 * the log, we do flush all iclogs to disk (if there
2105 * wasn't a log I/O error). So, we do want things to
2106 * go smoothly in case of just a SHUTDOWN w/o a
2107 * LOG_IO_ERROR.
2108 */
2109 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
2110 /*
2111 * Can only perform callbacks in order. Since
2112 * this iclog is not in the DONE_SYNC/
2113 * DO_CALLBACK state, we skip the rest and
2114 * just try to clean up. If we set our iclog
2115 * to DO_CALLBACK, we will not process it when
2116 * we retry since a previous iclog is in the
2117 * CALLBACK and the state cannot change since
2118 * we are holding the LOG_LOCK.
2119 */
2120 if (!(iclog->ic_state &
2121 (XLOG_STATE_DONE_SYNC |
2122 XLOG_STATE_DO_CALLBACK))) {
2123 if (ciclog && (ciclog->ic_state ==
2124 XLOG_STATE_DONE_SYNC)) {
2125 ciclog->ic_state = XLOG_STATE_DO_CALLBACK;
2126 }
2127 break;
2128 }
2129 /*
2130 * We now have an iclog that is in either the
2131 * DO_CALLBACK or DONE_SYNC states. The other
2132 * states (WANT_SYNC, SYNCING, or CALLBACK were
2133 * caught by the above if and are going to
2134 * clean (i.e. we aren't doing their callbacks)
2135 * see the above if.
2136 */
2137
2138 /*
2139 * We will do one more check here to see if we
2140 * have chased our tail around.
2141 */
2142
2143 lowest_lsn = xlog_get_lowest_lsn(log);
2144 if (lowest_lsn && (
2145 XFS_LSN_CMP(
2146 lowest_lsn,
2147 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT)
2148 )<0)) {
2149 iclog = iclog->ic_next;
2150 continue; /* Leave this iclog for
2151 * another thread */
2152 }
2153
2154 iclog->ic_state = XLOG_STATE_CALLBACK;
2155
2156 LOG_UNLOCK(log, s);
2157
2158 /* l_last_sync_lsn field protected by
2159 * GRANT_LOCK. Don't worry about iclog's lsn.
2160 * No one else can be here except us.
2161 */
2162 s = GRANT_LOCK(log);
2163 ASSERT(XFS_LSN_CMP(
2164 log->l_last_sync_lsn,
2165 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT)
2166 )<=0);
2167 log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT);
2168 GRANT_UNLOCK(log, s);
2169
2170 /*
2171 * Keep processing entries in the callback list
2172 * until we come around and it is empty. We
2173 * need to atomically see that the list is
2174 * empty and change the state to DIRTY so that
2175 * we don't miss any more callbacks being added.
2176 */
2177 s = LOG_LOCK(log);
2178 } else {
2179 ioerrors++;
2180 }
2181 cb = iclog->ic_callback;
2182
2183 while (cb != 0) {
2184 iclog->ic_callback_tail = &(iclog->ic_callback);
2185 iclog->ic_callback = NULL;
2186 LOG_UNLOCK(log, s);
2187
2188 /* perform callbacks in the order given */
2189 for (; cb != 0; cb = cb_next) {
2190 cb_next = cb->cb_next;
2191 cb->cb_func(cb->cb_arg, aborted);
2192 }
2193 s = LOG_LOCK(log);
2194 cb = iclog->ic_callback;
2195 }
2196
2197 loopdidcallbacks++;
2198 funcdidcallbacks++;
2199
2200 ASSERT(iclog->ic_callback == 0);
2201 if (!(iclog->ic_state & XLOG_STATE_IOERROR))
2202 iclog->ic_state = XLOG_STATE_DIRTY;
2203
2204 /*
2205 * Transition from DIRTY to ACTIVE if applicable.
2206 * NOP if STATE_IOERROR.
2207 */
2208 xlog_state_clean_log(log);
2209
2210 /* wake up threads waiting in xfs_log_force() */
2211 sv_broadcast(&iclog->ic_forcesema);
2212
2213 iclog = iclog->ic_next;
2214 } while (first_iclog != iclog);
2215 if (repeats && (repeats % 10) == 0) {
2216 xfs_fs_cmn_err(CE_WARN, log->l_mp,
2217 "xlog_state_do_callback: looping %d", repeats);
2218 }
2219 } while (!ioerrors && loopdidcallbacks);
2220
2221 /*
2222 * make one last gasp attempt to see if iclogs are being left in
2223 * limbo..
2224 */
2225#ifdef DEBUG
2226 if (funcdidcallbacks) {
2227 first_iclog = iclog = log->l_iclog;
2228 do {
2229 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK);
2230 /*
2231 * Terminate the loop if iclogs are found in states
2232 * which will cause other threads to clean up iclogs.
2233 *
2234 * SYNCING - i/o completion will go through logs
2235 * DONE_SYNC - interrupt thread should be waiting for
2236 * LOG_LOCK
2237 * IOERROR - give up hope all ye who enter here
2238 */
2239 if (iclog->ic_state == XLOG_STATE_WANT_SYNC ||
2240 iclog->ic_state == XLOG_STATE_SYNCING ||
2241 iclog->ic_state == XLOG_STATE_DONE_SYNC ||
2242 iclog->ic_state == XLOG_STATE_IOERROR )
2243 break;
2244 iclog = iclog->ic_next;
2245 } while (first_iclog != iclog);
2246 }
2247#endif
2248
2249 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) {
2250 flushcnt = log->l_flushcnt;
2251 log->l_flushcnt = 0;
2252 }
2253 LOG_UNLOCK(log, s);
2254 while (flushcnt--)
2255 vsema(&log->l_flushsema);
2256} /* xlog_state_do_callback */
2257
2258
2259/*
2260 * Finish transitioning this iclog to the dirty state.
2261 *
2262 * Make sure that we completely execute this routine only when this is
2263 * the last call to the iclog. There is a good chance that iclog flushes,
2264 * when we reach the end of the physical log, get turned into 2 separate
2265 * calls to bwrite. Hence, one iclog flush could generate two calls to this
2266 * routine. By using the reference count bwritecnt, we guarantee that only
2267 * the second completion goes through.
2268 *
2269 * Callbacks could take time, so they are done outside the scope of the
2270 * global state machine log lock. Assume that the calls to cvsema won't
2271 * take a long time. At least we know it won't sleep.
2272 */
2273void
2274xlog_state_done_syncing(
2275 xlog_in_core_t *iclog,
2276 int aborted)
2277{
2278 xlog_t *log = iclog->ic_log;
2279 SPLDECL(s);
2280
2281 s = LOG_LOCK(log);
2282
2283 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING ||
2284 iclog->ic_state == XLOG_STATE_IOERROR);
2285 ASSERT(iclog->ic_refcnt == 0);
2286 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2);
2287
2288
2289 /*
2290 * If we got an error, either on the first buffer, or in the case of
2291 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR,
2292 * and none should ever be attempted to be written to disk
2293 * again.
2294 */
2295 if (iclog->ic_state != XLOG_STATE_IOERROR) {
2296 if (--iclog->ic_bwritecnt == 1) {
2297 LOG_UNLOCK(log, s);
2298 return;
2299 }
2300 iclog->ic_state = XLOG_STATE_DONE_SYNC;
2301 }
2302
2303 /*
2304 * Someone could be sleeping prior to writing out the next
2305 * iclog buffer, we wake them all, one will get to do the
2306 * I/O, the others get to wait for the result.
2307 */
2308 sv_broadcast(&iclog->ic_writesema);
2309 LOG_UNLOCK(log, s);
2310 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */
2311} /* xlog_state_done_syncing */
2312
2313
2314/*
2315 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must
2316 * sleep. The flush semaphore is set to the number of in-core buffers and
2317 * decremented around disk syncing. Therefore, if all buffers are syncing,
2318 * this semaphore will cause new writes to sleep until a sync completes.
2319 * Otherwise, this code just does p() followed by v(). This approximates
2320 * a sleep/wakeup except we can't race.
2321 *
2322 * The in-core logs are used in a circular fashion. They are not used
2323 * out-of-order even when an iclog past the head is free.
2324 *
2325 * return:
2326 * * log_offset where xlog_write() can start writing into the in-core
2327 * log's data space.
2328 * * in-core log pointer to which xlog_write() should write.
2329 * * boolean indicating this is a continued write to an in-core log.
2330 * If this is the last write, then the in-core log's offset field
2331 * needs to be incremented, depending on the amount of data which
2332 * is copied.
2333 */
2334int
2335xlog_state_get_iclog_space(xlog_t *log,
2336 int len,
2337 xlog_in_core_t **iclogp,
2338 xlog_ticket_t *ticket,
2339 int *continued_write,
2340 int *logoffsetp)
2341{
2342 SPLDECL(s);
2343 int log_offset;
2344 xlog_rec_header_t *head;
2345 xlog_in_core_t *iclog;
2346 int error;
2347
2348restart:
2349 s = LOG_LOCK(log);
2350 if (XLOG_FORCED_SHUTDOWN(log)) {
2351 LOG_UNLOCK(log, s);
2352 return XFS_ERROR(EIO);
2353 }
2354
2355 iclog = log->l_iclog;
2356 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) {
2357 log->l_flushcnt++;
2358 LOG_UNLOCK(log, s);
2359 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH);
2360 XFS_STATS_INC(xs_log_noiclogs);
2361 /* Ensure that log writes happen */
2362 psema(&log->l_flushsema, PINOD);
2363 goto restart;
2364 }
2365 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
2366 head = &iclog->ic_header;
2367
2368 iclog->ic_refcnt++; /* prevents sync */
2369 log_offset = iclog->ic_offset;
2370
2371 /* On the 1st write to an iclog, figure out lsn. This works
2372 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
2373 * committing to. If the offset is set, that's how many blocks
2374 * must be written.
2375 */
2376 if (log_offset == 0) {
2377 ticket->t_curr_res -= log->l_iclog_hsize;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10002378 XLOG_TIC_ADD_REGION(ticket,
2379 log->l_iclog_hsize,
2380 XLOG_REG_TYPE_LRHEADER);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002381 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle);
2382 ASSIGN_LSN(head->h_lsn, log);
2383 ASSERT(log->l_curr_block >= 0);
2384 }
2385
2386 /* If there is enough room to write everything, then do it. Otherwise,
2387 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC
2388 * bit is on, so this will get flushed out. Don't update ic_offset
2389 * until you know exactly how many bytes get copied. Therefore, wait
2390 * until later to update ic_offset.
2391 *
2392 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's
2393 * can fit into remaining data section.
2394 */
2395 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) {
2396 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2397
2398 /* If I'm the only one writing to this iclog, sync it to disk */
2399 if (iclog->ic_refcnt == 1) {
2400 LOG_UNLOCK(log, s);
2401 if ((error = xlog_state_release_iclog(log, iclog)))
Jesper Juhl014c2542006-01-15 02:37:08 +01002402 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 } else {
2404 iclog->ic_refcnt--;
2405 LOG_UNLOCK(log, s);
2406 }
2407 goto restart;
2408 }
2409
2410 /* Do we have enough room to write the full amount in the remainder
2411 * of this iclog? Or must we continue a write on the next iclog and
2412 * mark this iclog as completely taken? In the case where we switch
2413 * iclogs (to mark it taken), this particular iclog will release/sync
2414 * to disk in xlog_write().
2415 */
2416 if (len <= iclog->ic_size - iclog->ic_offset) {
2417 *continued_write = 0;
2418 iclog->ic_offset += len;
2419 } else {
2420 *continued_write = 1;
2421 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2422 }
2423 *iclogp = iclog;
2424
2425 ASSERT(iclog->ic_offset <= iclog->ic_size);
2426 LOG_UNLOCK(log, s);
2427
2428 *logoffsetp = log_offset;
2429 return 0;
2430} /* xlog_state_get_iclog_space */
2431
2432/*
2433 * Atomically get the log space required for a log ticket.
2434 *
2435 * Once a ticket gets put onto the reserveq, it will only return after
2436 * the needed reservation is satisfied.
2437 */
2438STATIC int
2439xlog_grant_log_space(xlog_t *log,
2440 xlog_ticket_t *tic)
2441{
2442 int free_bytes;
2443 int need_bytes;
2444 SPLDECL(s);
2445#ifdef DEBUG
2446 xfs_lsn_t tail_lsn;
2447#endif
2448
2449
2450#ifdef DEBUG
2451 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
2452 panic("grant Recovery problem");
2453#endif
2454
2455 /* Is there space or do we need to sleep? */
2456 s = GRANT_LOCK(log);
2457 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter");
2458
2459 /* something is already sleeping; insert new transaction at end */
2460 if (log->l_reserve_headq) {
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002461 xlog_ins_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462 xlog_trace_loggrant(log, tic,
2463 "xlog_grant_log_space: sleep 1");
2464 /*
2465 * Gotta check this before going to sleep, while we're
2466 * holding the grant lock.
2467 */
2468 if (XLOG_FORCED_SHUTDOWN(log))
2469 goto error_return;
2470
2471 XFS_STATS_INC(xs_sleep_logspace);
2472 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2473 /*
2474 * If we got an error, and the filesystem is shutting down,
2475 * we'll catch it down below. So just continue...
2476 */
2477 xlog_trace_loggrant(log, tic,
2478 "xlog_grant_log_space: wake 1");
2479 s = GRANT_LOCK(log);
2480 }
2481 if (tic->t_flags & XFS_LOG_PERM_RESERV)
2482 need_bytes = tic->t_unit_res*tic->t_ocnt;
2483 else
2484 need_bytes = tic->t_unit_res;
2485
2486redo:
2487 if (XLOG_FORCED_SHUTDOWN(log))
2488 goto error_return;
2489
2490 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle,
2491 log->l_grant_reserve_bytes);
2492 if (free_bytes < need_bytes) {
2493 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002494 xlog_ins_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495 xlog_trace_loggrant(log, tic,
2496 "xlog_grant_log_space: sleep 2");
2497 XFS_STATS_INC(xs_sleep_logspace);
2498 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2499
2500 if (XLOG_FORCED_SHUTDOWN(log)) {
2501 s = GRANT_LOCK(log);
2502 goto error_return;
2503 }
2504
2505 xlog_trace_loggrant(log, tic,
2506 "xlog_grant_log_space: wake 2");
2507 xlog_grant_push_ail(log->l_mp, need_bytes);
2508 s = GRANT_LOCK(log);
2509 goto redo;
2510 } else if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002511 xlog_del_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512
2513 /* we've got enough space */
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002514 xlog_grant_add_space(log, need_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515#ifdef DEBUG
2516 tail_lsn = log->l_tail_lsn;
2517 /*
2518 * Check to make sure the grant write head didn't just over lap the
2519 * tail. If the cycles are the same, we can't be overlapping.
2520 * Otherwise, make sure that the cycles differ by exactly one and
2521 * check the byte count.
2522 */
2523 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {
2524 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));
2525 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));
2526 }
2527#endif
2528 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit");
2529 xlog_verify_grant_head(log, 1);
2530 GRANT_UNLOCK(log, s);
2531 return 0;
2532
2533 error_return:
2534 if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002535 xlog_del_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret");
2537 /*
2538 * If we are failing, make sure the ticket doesn't have any
2539 * current reservations. We don't want to add this back when
2540 * the ticket/transaction gets cancelled.
2541 */
2542 tic->t_curr_res = 0;
2543 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
2544 GRANT_UNLOCK(log, s);
2545 return XFS_ERROR(EIO);
2546} /* xlog_grant_log_space */
2547
2548
2549/*
2550 * Replenish the byte reservation required by moving the grant write head.
2551 *
2552 *
2553 */
2554STATIC int
2555xlog_regrant_write_log_space(xlog_t *log,
2556 xlog_ticket_t *tic)
2557{
2558 SPLDECL(s);
2559 int free_bytes, need_bytes;
2560 xlog_ticket_t *ntic;
2561#ifdef DEBUG
2562 xfs_lsn_t tail_lsn;
2563#endif
2564
2565 tic->t_curr_res = tic->t_unit_res;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10002566 XLOG_TIC_RESET_RES(tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002567
2568 if (tic->t_cnt > 0)
Jesper Juhl014c2542006-01-15 02:37:08 +01002569 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570
2571#ifdef DEBUG
2572 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
2573 panic("regrant Recovery problem");
2574#endif
2575
2576 s = GRANT_LOCK(log);
2577 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter");
2578
2579 if (XLOG_FORCED_SHUTDOWN(log))
2580 goto error_return;
2581
2582 /* If there are other waiters on the queue then give them a
2583 * chance at logspace before us. Wake up the first waiters,
2584 * if we do not wake up all the waiters then go to sleep waiting
2585 * for more free space, otherwise try to get some space for
2586 * this transaction.
2587 */
2588
2589 if ((ntic = log->l_write_headq)) {
2590 free_bytes = xlog_space_left(log, log->l_grant_write_cycle,
2591 log->l_grant_write_bytes);
2592 do {
2593 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV);
2594
2595 if (free_bytes < ntic->t_unit_res)
2596 break;
2597 free_bytes -= ntic->t_unit_res;
2598 sv_signal(&ntic->t_sema);
2599 ntic = ntic->t_next;
2600 } while (ntic != log->l_write_headq);
2601
2602 if (ntic != log->l_write_headq) {
2603 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002604 xlog_ins_ticketq(&log->l_write_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605
2606 xlog_trace_loggrant(log, tic,
2607 "xlog_regrant_write_log_space: sleep 1");
2608 XFS_STATS_INC(xs_sleep_logspace);
2609 sv_wait(&tic->t_sema, PINOD|PLTWAIT,
2610 &log->l_grant_lock, s);
2611
2612 /* If we're shutting down, this tic is already
2613 * off the queue */
2614 if (XLOG_FORCED_SHUTDOWN(log)) {
2615 s = GRANT_LOCK(log);
2616 goto error_return;
2617 }
2618
2619 xlog_trace_loggrant(log, tic,
2620 "xlog_regrant_write_log_space: wake 1");
2621 xlog_grant_push_ail(log->l_mp, tic->t_unit_res);
2622 s = GRANT_LOCK(log);
2623 }
2624 }
2625
2626 need_bytes = tic->t_unit_res;
2627
2628redo:
2629 if (XLOG_FORCED_SHUTDOWN(log))
2630 goto error_return;
2631
2632 free_bytes = xlog_space_left(log, log->l_grant_write_cycle,
2633 log->l_grant_write_bytes);
2634 if (free_bytes < need_bytes) {
2635 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002636 xlog_ins_ticketq(&log->l_write_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 XFS_STATS_INC(xs_sleep_logspace);
2638 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2639
2640 /* If we're shutting down, this tic is already off the queue */
2641 if (XLOG_FORCED_SHUTDOWN(log)) {
2642 s = GRANT_LOCK(log);
2643 goto error_return;
2644 }
2645
2646 xlog_trace_loggrant(log, tic,
2647 "xlog_regrant_write_log_space: wake 2");
2648 xlog_grant_push_ail(log->l_mp, need_bytes);
2649 s = GRANT_LOCK(log);
2650 goto redo;
2651 } else if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002652 xlog_del_ticketq(&log->l_write_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002654 /* we've got enough space */
2655 xlog_grant_add_space_write(log, need_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656#ifdef DEBUG
2657 tail_lsn = log->l_tail_lsn;
2658 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {
2659 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));
2660 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));
2661 }
2662#endif
2663
2664 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit");
2665 xlog_verify_grant_head(log, 1);
2666 GRANT_UNLOCK(log, s);
Jesper Juhl014c2542006-01-15 02:37:08 +01002667 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668
2669
2670 error_return:
2671 if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002672 xlog_del_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret");
2674 /*
2675 * If we are failing, make sure the ticket doesn't have any
2676 * current reservations. We don't want to add this back when
2677 * the ticket/transaction gets cancelled.
2678 */
2679 tic->t_curr_res = 0;
2680 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
2681 GRANT_UNLOCK(log, s);
2682 return XFS_ERROR(EIO);
2683} /* xlog_regrant_write_log_space */
2684
2685
2686/* The first cnt-1 times through here we don't need to
2687 * move the grant write head because the permanent
2688 * reservation has reserved cnt times the unit amount.
2689 * Release part of current permanent unit reservation and
2690 * reset current reservation to be one units worth. Also
2691 * move grant reservation head forward.
2692 */
2693STATIC void
2694xlog_regrant_reserve_log_space(xlog_t *log,
2695 xlog_ticket_t *ticket)
2696{
2697 SPLDECL(s);
2698
2699 xlog_trace_loggrant(log, ticket,
2700 "xlog_regrant_reserve_log_space: enter");
2701 if (ticket->t_cnt > 0)
2702 ticket->t_cnt--;
2703
2704 s = GRANT_LOCK(log);
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002705 xlog_grant_sub_space(log, ticket->t_curr_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706 ticket->t_curr_res = ticket->t_unit_res;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10002707 XLOG_TIC_RESET_RES(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002708 xlog_trace_loggrant(log, ticket,
2709 "xlog_regrant_reserve_log_space: sub current res");
2710 xlog_verify_grant_head(log, 1);
2711
2712 /* just return if we still have some of the pre-reserved space */
2713 if (ticket->t_cnt > 0) {
2714 GRANT_UNLOCK(log, s);
2715 return;
2716 }
2717
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002718 xlog_grant_add_space_reserve(log, ticket->t_unit_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719 xlog_trace_loggrant(log, ticket,
2720 "xlog_regrant_reserve_log_space: exit");
2721 xlog_verify_grant_head(log, 0);
2722 GRANT_UNLOCK(log, s);
2723 ticket->t_curr_res = ticket->t_unit_res;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10002724 XLOG_TIC_RESET_RES(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725} /* xlog_regrant_reserve_log_space */
2726
2727
2728/*
2729 * Give back the space left from a reservation.
2730 *
2731 * All the information we need to make a correct determination of space left
2732 * is present. For non-permanent reservations, things are quite easy. The
2733 * count should have been decremented to zero. We only need to deal with the
2734 * space remaining in the current reservation part of the ticket. If the
2735 * ticket contains a permanent reservation, there may be left over space which
2736 * needs to be released. A count of N means that N-1 refills of the current
2737 * reservation can be done before we need to ask for more space. The first
2738 * one goes to fill up the first current reservation. Once we run out of
2739 * space, the count will stay at zero and the only space remaining will be
2740 * in the current reservation field.
2741 */
2742STATIC void
2743xlog_ungrant_log_space(xlog_t *log,
2744 xlog_ticket_t *ticket)
2745{
2746 SPLDECL(s);
2747
2748 if (ticket->t_cnt > 0)
2749 ticket->t_cnt--;
2750
2751 s = GRANT_LOCK(log);
2752 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter");
2753
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002754 xlog_grant_sub_space(log, ticket->t_curr_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002755
2756 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current");
2757
2758 /* If this is a permanent reservation ticket, we may be able to free
2759 * up more space based on the remaining count.
2760 */
2761 if (ticket->t_cnt > 0) {
2762 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV);
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002763 xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764 }
2765
2766 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit");
2767 xlog_verify_grant_head(log, 1);
2768 GRANT_UNLOCK(log, s);
2769 xfs_log_move_tail(log->l_mp, 1);
2770} /* xlog_ungrant_log_space */
2771
2772
2773/*
2774 * Atomically put back used ticket.
2775 */
2776void
2777xlog_state_put_ticket(xlog_t *log,
2778 xlog_ticket_t *tic)
2779{
2780 unsigned long s;
2781
2782 s = LOG_LOCK(log);
2783 xlog_ticket_put(log, tic);
2784 LOG_UNLOCK(log, s);
2785} /* xlog_state_put_ticket */
2786
2787/*
2788 * Flush iclog to disk if this is the last reference to the given iclog and
2789 * the WANT_SYNC bit is set.
2790 *
2791 * When this function is entered, the iclog is not necessarily in the
2792 * WANT_SYNC state. It may be sitting around waiting to get filled.
2793 *
2794 *
2795 */
2796int
2797xlog_state_release_iclog(xlog_t *log,
2798 xlog_in_core_t *iclog)
2799{
2800 SPLDECL(s);
2801 int sync = 0; /* do we sync? */
2802
2803 xlog_assign_tail_lsn(log->l_mp);
2804
2805 s = LOG_LOCK(log);
2806
2807 if (iclog->ic_state & XLOG_STATE_IOERROR) {
2808 LOG_UNLOCK(log, s);
2809 return XFS_ERROR(EIO);
2810 }
2811
2812 ASSERT(iclog->ic_refcnt > 0);
2813 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE ||
2814 iclog->ic_state == XLOG_STATE_WANT_SYNC);
2815
2816 if (--iclog->ic_refcnt == 0 &&
2817 iclog->ic_state == XLOG_STATE_WANT_SYNC) {
2818 sync++;
2819 iclog->ic_state = XLOG_STATE_SYNCING;
2820 INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn);
2821 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn);
2822 /* cycle incremented when incrementing curr_block */
2823 }
2824
2825 LOG_UNLOCK(log, s);
2826
2827 /*
2828 * We let the log lock go, so it's possible that we hit a log I/O
Nathan Scottc41564b2006-03-29 08:55:14 +10002829 * error or some other SHUTDOWN condition that marks the iclog
Linus Torvalds1da177e2005-04-16 15:20:36 -07002830 * as XLOG_STATE_IOERROR before the bwrite. However, we know that
2831 * this iclog has consistent data, so we ignore IOERROR
2832 * flags after this point.
2833 */
2834 if (sync) {
2835 return xlog_sync(log, iclog);
2836 }
Jesper Juhl014c2542006-01-15 02:37:08 +01002837 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838
2839} /* xlog_state_release_iclog */
2840
2841
2842/*
2843 * This routine will mark the current iclog in the ring as WANT_SYNC
2844 * and move the current iclog pointer to the next iclog in the ring.
2845 * When this routine is called from xlog_state_get_iclog_space(), the
2846 * exact size of the iclog has not yet been determined. All we know is
2847 * that every data block. We have run out of space in this log record.
2848 */
2849STATIC void
2850xlog_state_switch_iclogs(xlog_t *log,
2851 xlog_in_core_t *iclog,
2852 int eventual_size)
2853{
2854 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
2855 if (!eventual_size)
2856 eventual_size = iclog->ic_offset;
2857 iclog->ic_state = XLOG_STATE_WANT_SYNC;
2858 INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block);
2859 log->l_prev_block = log->l_curr_block;
2860 log->l_prev_cycle = log->l_curr_cycle;
2861
2862 /* roll log?: ic_offset changed later */
2863 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize);
2864
2865 /* Round up to next log-sunit */
2866 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) &&
2867 log->l_mp->m_sb.sb_logsunit > 1) {
2868 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit);
2869 log->l_curr_block = roundup(log->l_curr_block, sunit_bb);
2870 }
2871
2872 if (log->l_curr_block >= log->l_logBBsize) {
2873 log->l_curr_cycle++;
2874 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM)
2875 log->l_curr_cycle++;
2876 log->l_curr_block -= log->l_logBBsize;
2877 ASSERT(log->l_curr_block >= 0);
2878 }
2879 ASSERT(iclog == log->l_iclog);
2880 log->l_iclog = iclog->ic_next;
2881} /* xlog_state_switch_iclogs */
2882
2883
2884/*
2885 * Write out all data in the in-core log as of this exact moment in time.
2886 *
2887 * Data may be written to the in-core log during this call. However,
2888 * we don't guarantee this data will be written out. A change from past
2889 * implementation means this routine will *not* write out zero length LRs.
2890 *
2891 * Basically, we try and perform an intelligent scan of the in-core logs.
2892 * If we determine there is no flushable data, we just return. There is no
2893 * flushable data if:
2894 *
2895 * 1. the current iclog is active and has no data; the previous iclog
2896 * is in the active or dirty state.
2897 * 2. the current iclog is drity, and the previous iclog is in the
2898 * active or dirty state.
2899 *
2900 * We may sleep (call psema) if:
2901 *
2902 * 1. the current iclog is not in the active nor dirty state.
2903 * 2. the current iclog dirty, and the previous iclog is not in the
2904 * active nor dirty state.
2905 * 3. the current iclog is active, and there is another thread writing
2906 * to this particular iclog.
2907 * 4. a) the current iclog is active and has no other writers
2908 * b) when we return from flushing out this iclog, it is still
2909 * not in the active nor dirty state.
2910 */
2911STATIC int
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11002912xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913{
2914 xlog_in_core_t *iclog;
2915 xfs_lsn_t lsn;
2916 SPLDECL(s);
2917
2918 s = LOG_LOCK(log);
2919
2920 iclog = log->l_iclog;
2921 if (iclog->ic_state & XLOG_STATE_IOERROR) {
2922 LOG_UNLOCK(log, s);
2923 return XFS_ERROR(EIO);
2924 }
2925
2926 /* If the head iclog is not active nor dirty, we just attach
2927 * ourselves to the head and go to sleep.
2928 */
2929 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
2930 iclog->ic_state == XLOG_STATE_DIRTY) {
2931 /*
2932 * If the head is dirty or (active and empty), then
2933 * we need to look at the previous iclog. If the previous
2934 * iclog is active or dirty we are done. There is nothing
2935 * to sync out. Otherwise, we attach ourselves to the
2936 * previous iclog and go to sleep.
2937 */
2938 if (iclog->ic_state == XLOG_STATE_DIRTY ||
2939 (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) {
2940 iclog = iclog->ic_prev;
2941 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
2942 iclog->ic_state == XLOG_STATE_DIRTY)
2943 goto no_sleep;
2944 else
2945 goto maybe_sleep;
2946 } else {
2947 if (iclog->ic_refcnt == 0) {
2948 /* We are the only one with access to this
2949 * iclog. Flush it out now. There should
2950 * be a roundoff of zero to show that someone
2951 * has already taken care of the roundoff from
2952 * the previous sync.
2953 */
2954 iclog->ic_refcnt++;
2955 lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT);
2956 xlog_state_switch_iclogs(log, iclog, 0);
2957 LOG_UNLOCK(log, s);
2958
2959 if (xlog_state_release_iclog(log, iclog))
2960 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11002961 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962 s = LOG_LOCK(log);
2963 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn &&
2964 iclog->ic_state != XLOG_STATE_DIRTY)
2965 goto maybe_sleep;
2966 else
2967 goto no_sleep;
2968 } else {
2969 /* Someone else is writing to this iclog.
2970 * Use its call to flush out the data. However,
2971 * the other thread may not force out this LR,
2972 * so we mark it WANT_SYNC.
2973 */
2974 xlog_state_switch_iclogs(log, iclog, 0);
2975 goto maybe_sleep;
2976 }
2977 }
2978 }
2979
2980 /* By the time we come around again, the iclog could've been filled
2981 * which would give it another lsn. If we have a new lsn, just
2982 * return because the relevant data has been flushed.
2983 */
2984maybe_sleep:
2985 if (flags & XFS_LOG_SYNC) {
2986 /*
2987 * We must check if we're shutting down here, before
2988 * we wait, while we're holding the LOG_LOCK.
2989 * Then we check again after waking up, in case our
2990 * sleep was disturbed by a bad news.
2991 */
2992 if (iclog->ic_state & XLOG_STATE_IOERROR) {
2993 LOG_UNLOCK(log, s);
2994 return XFS_ERROR(EIO);
2995 }
2996 XFS_STATS_INC(xs_log_force_sleep);
2997 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s);
2998 /*
2999 * No need to grab the log lock here since we're
3000 * only deciding whether or not to return EIO
3001 * and the memory read should be atomic.
3002 */
3003 if (iclog->ic_state & XLOG_STATE_IOERROR)
3004 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003005 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003006
3007 } else {
3008
3009no_sleep:
3010 LOG_UNLOCK(log, s);
3011 }
3012 return 0;
3013} /* xlog_state_sync_all */
3014
3015
3016/*
3017 * Used by code which implements synchronous log forces.
3018 *
3019 * Find in-core log with lsn.
3020 * If it is in the DIRTY state, just return.
3021 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
3022 * state and go to sleep or return.
3023 * If it is in any other state, go to sleep or return.
3024 *
3025 * If filesystem activity goes to zero, the iclog will get flushed only by
3026 * bdflush().
3027 */
3028int
3029xlog_state_sync(xlog_t *log,
3030 xfs_lsn_t lsn,
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003031 uint flags,
3032 int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003033{
3034 xlog_in_core_t *iclog;
3035 int already_slept = 0;
3036 SPLDECL(s);
3037
3038
3039try_again:
3040 s = LOG_LOCK(log);
3041 iclog = log->l_iclog;
3042
3043 if (iclog->ic_state & XLOG_STATE_IOERROR) {
3044 LOG_UNLOCK(log, s);
3045 return XFS_ERROR(EIO);
3046 }
3047
3048 do {
3049 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) {
3050 iclog = iclog->ic_next;
3051 continue;
3052 }
3053
3054 if (iclog->ic_state == XLOG_STATE_DIRTY) {
3055 LOG_UNLOCK(log, s);
3056 return 0;
3057 }
3058
3059 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3060 /*
3061 * We sleep here if we haven't already slept (e.g.
3062 * this is the first time we've looked at the correct
3063 * iclog buf) and the buffer before us is going to
3064 * be sync'ed. The reason for this is that if we
3065 * are doing sync transactions here, by waiting for
3066 * the previous I/O to complete, we can allow a few
3067 * more transactions into this iclog before we close
3068 * it down.
3069 *
3070 * Otherwise, we mark the buffer WANT_SYNC, and bump
3071 * up the refcnt so we can release the log (which drops
3072 * the ref count). The state switch keeps new transaction
3073 * commits from using this buffer. When the current commits
3074 * finish writing into the buffer, the refcount will drop to
3075 * zero and the buffer will go out then.
3076 */
3077 if (!already_slept &&
3078 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC |
3079 XLOG_STATE_SYNCING))) {
3080 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR));
3081 XFS_STATS_INC(xs_log_force_sleep);
3082 sv_wait(&iclog->ic_prev->ic_writesema, PSWP,
3083 &log->l_icloglock, s);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003084 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085 already_slept = 1;
3086 goto try_again;
3087 } else {
3088 iclog->ic_refcnt++;
3089 xlog_state_switch_iclogs(log, iclog, 0);
3090 LOG_UNLOCK(log, s);
3091 if (xlog_state_release_iclog(log, iclog))
3092 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003093 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094 s = LOG_LOCK(log);
3095 }
3096 }
3097
3098 if ((flags & XFS_LOG_SYNC) && /* sleep */
3099 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) {
3100
3101 /*
3102 * Don't wait on the forcesema if we know that we've
3103 * gotten a log write error.
3104 */
3105 if (iclog->ic_state & XLOG_STATE_IOERROR) {
3106 LOG_UNLOCK(log, s);
3107 return XFS_ERROR(EIO);
3108 }
3109 XFS_STATS_INC(xs_log_force_sleep);
3110 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s);
3111 /*
3112 * No need to grab the log lock here since we're
3113 * only deciding whether or not to return EIO
3114 * and the memory read should be atomic.
3115 */
3116 if (iclog->ic_state & XLOG_STATE_IOERROR)
3117 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003118 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003119 } else { /* just return */
3120 LOG_UNLOCK(log, s);
3121 }
3122 return 0;
3123
3124 } while (iclog != log->l_iclog);
3125
3126 LOG_UNLOCK(log, s);
Jesper Juhl014c2542006-01-15 02:37:08 +01003127 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128} /* xlog_state_sync */
3129
3130
3131/*
3132 * Called when we want to mark the current iclog as being ready to sync to
3133 * disk.
3134 */
3135void
3136xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog)
3137{
3138 SPLDECL(s);
3139
3140 s = LOG_LOCK(log);
3141
3142 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3143 xlog_state_switch_iclogs(log, iclog, 0);
3144 } else {
3145 ASSERT(iclog->ic_state &
3146 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR));
3147 }
3148
3149 LOG_UNLOCK(log, s);
3150} /* xlog_state_want_sync */
3151
3152
3153
3154/*****************************************************************************
3155 *
3156 * TICKET functions
3157 *
3158 *****************************************************************************
3159 */
3160
3161/*
3162 * Algorithm doesn't take into account page size. ;-(
3163 */
3164STATIC void
3165xlog_state_ticket_alloc(xlog_t *log)
3166{
3167 xlog_ticket_t *t_list;
3168 xlog_ticket_t *next;
3169 xfs_caddr_t buf;
3170 uint i = (NBPP / sizeof(xlog_ticket_t)) - 2;
3171 SPLDECL(s);
3172
3173 /*
3174 * The kmem_zalloc may sleep, so we shouldn't be holding the
3175 * global lock. XXXmiken: may want to use zone allocator.
3176 */
3177 buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP);
3178
3179 s = LOG_LOCK(log);
3180
3181 /* Attach 1st ticket to Q, so we can keep track of allocated memory */
3182 t_list = (xlog_ticket_t *)buf;
3183 t_list->t_next = log->l_unmount_free;
3184 log->l_unmount_free = t_list++;
3185 log->l_ticket_cnt++;
3186 log->l_ticket_tcnt++;
3187
3188 /* Next ticket becomes first ticket attached to ticket free list */
3189 if (log->l_freelist != NULL) {
3190 ASSERT(log->l_tail != NULL);
3191 log->l_tail->t_next = t_list;
3192 } else {
3193 log->l_freelist = t_list;
3194 }
3195 log->l_ticket_cnt++;
3196 log->l_ticket_tcnt++;
3197
3198 /* Cycle through rest of alloc'ed memory, building up free Q */
3199 for ( ; i > 0; i--) {
3200 next = t_list + 1;
3201 t_list->t_next = next;
3202 t_list = next;
3203 log->l_ticket_cnt++;
3204 log->l_ticket_tcnt++;
3205 }
3206 t_list->t_next = NULL;
3207 log->l_tail = t_list;
3208 LOG_UNLOCK(log, s);
3209} /* xlog_state_ticket_alloc */
3210
3211
3212/*
3213 * Put ticket into free list
3214 *
3215 * Assumption: log lock is held around this call.
3216 */
3217STATIC void
3218xlog_ticket_put(xlog_t *log,
3219 xlog_ticket_t *ticket)
3220{
3221 sv_destroy(&ticket->t_sema);
3222
3223 /*
3224 * Don't think caching will make that much difference. It's
3225 * more important to make debug easier.
3226 */
3227#if 0
3228 /* real code will want to use LIFO for caching */
3229 ticket->t_next = log->l_freelist;
3230 log->l_freelist = ticket;
3231 /* no need to clear fields */
3232#else
3233 /* When we debug, it is easier if tickets are cycled */
3234 ticket->t_next = NULL;
3235 if (log->l_tail != 0) {
3236 log->l_tail->t_next = ticket;
3237 } else {
3238 ASSERT(log->l_freelist == 0);
3239 log->l_freelist = ticket;
3240 }
3241 log->l_tail = ticket;
3242#endif /* DEBUG */
3243 log->l_ticket_cnt++;
3244} /* xlog_ticket_put */
3245
3246
3247/*
3248 * Grab ticket off freelist or allocation some more
3249 */
3250xlog_ticket_t *
3251xlog_ticket_get(xlog_t *log,
3252 int unit_bytes,
3253 int cnt,
3254 char client,
3255 uint xflags)
3256{
3257 xlog_ticket_t *tic;
3258 uint num_headers;
3259 SPLDECL(s);
3260
3261 alloc:
3262 if (log->l_freelist == NULL)
3263 xlog_state_ticket_alloc(log); /* potentially sleep */
3264
3265 s = LOG_LOCK(log);
3266 if (log->l_freelist == NULL) {
3267 LOG_UNLOCK(log, s);
3268 goto alloc;
3269 }
3270 tic = log->l_freelist;
3271 log->l_freelist = tic->t_next;
3272 if (log->l_freelist == NULL)
3273 log->l_tail = NULL;
3274 log->l_ticket_cnt--;
3275 LOG_UNLOCK(log, s);
3276
3277 /*
3278 * Permanent reservations have up to 'cnt'-1 active log operations
3279 * in the log. A unit in this case is the amount of space for one
3280 * of these log operations. Normal reservations have a cnt of 1
3281 * and their unit amount is the total amount of space required.
3282 *
3283 * The following lines of code account for non-transaction data
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003284 * which occupy space in the on-disk log.
3285 *
3286 * Normal form of a transaction is:
3287 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph>
3288 * and then there are LR hdrs, split-recs and roundoff at end of syncs.
3289 *
3290 * We need to account for all the leadup data and trailer data
3291 * around the transaction data.
3292 * And then we need to account for the worst case in terms of using
3293 * more space.
3294 * The worst case will happen if:
3295 * - the placement of the transaction happens to be such that the
3296 * roundoff is at its maximum
3297 * - the transaction data is synced before the commit record is synced
3298 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff>
3299 * Therefore the commit record is in its own Log Record.
3300 * This can happen as the commit record is called with its
3301 * own region to xlog_write().
3302 * This then means that in the worst case, roundoff can happen for
3303 * the commit-rec as well.
3304 * The commit-rec is smaller than padding in this scenario and so it is
3305 * not added separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003306 */
3307
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003308 /* for trans header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003309 unit_bytes += sizeof(xlog_op_header_t);
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003310 unit_bytes += sizeof(xfs_trans_header_t);
3311
3312 /* for start-rec */
3313 unit_bytes += sizeof(xlog_op_header_t);
3314
Linus Torvalds1da177e2005-04-16 15:20:36 -07003315 /* for LR headers */
3316 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log);
3317 unit_bytes += log->l_iclog_hsize * num_headers;
3318
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003319 /* for commit-rec LR header - note: padding will subsume the ophdr */
3320 unit_bytes += log->l_iclog_hsize;
3321
3322 /* for split-recs - ophdrs added when data split over LRs */
3323 unit_bytes += sizeof(xlog_op_header_t) * num_headers;
3324
3325 /* for roundoff padding for transaction data and one for commit record */
3326 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) &&
3327 log->l_mp->m_sb.sb_logsunit > 1) {
3328 /* log su roundoff */
3329 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit;
3330 } else {
3331 /* BB roundoff */
3332 unit_bytes += 2*BBSIZE;
3333 }
3334
Linus Torvalds1da177e2005-04-16 15:20:36 -07003335 tic->t_unit_res = unit_bytes;
3336 tic->t_curr_res = unit_bytes;
3337 tic->t_cnt = cnt;
3338 tic->t_ocnt = cnt;
3339 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff);
3340 tic->t_clientid = client;
3341 tic->t_flags = XLOG_TIC_INITED;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10003342 tic->t_trans_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003343 if (xflags & XFS_LOG_PERM_RESERV)
3344 tic->t_flags |= XLOG_TIC_PERM_RESERV;
3345 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick");
3346
Tim Shimmin7e9c6392005-09-02 16:42:05 +10003347 XLOG_TIC_RESET_RES(tic);
3348
Linus Torvalds1da177e2005-04-16 15:20:36 -07003349 return tic;
3350} /* xlog_ticket_get */
3351
3352
3353/******************************************************************************
3354 *
3355 * Log debug routines
3356 *
3357 ******************************************************************************
3358 */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11003359#if defined(DEBUG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003360/*
3361 * Make sure that the destination ptr is within the valid data region of
3362 * one of the iclogs. This uses backup pointers stored in a different
3363 * part of the log in case we trash the log structure.
3364 */
3365void
3366xlog_verify_dest_ptr(xlog_t *log,
3367 __psint_t ptr)
3368{
3369 int i;
3370 int good_ptr = 0;
3371
3372 for (i=0; i < log->l_iclog_bufs; i++) {
3373 if (ptr >= (__psint_t)log->l_iclog_bak[i] &&
3374 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size)
3375 good_ptr++;
3376 }
3377 if (! good_ptr)
3378 xlog_panic("xlog_verify_dest_ptr: invalid ptr");
3379} /* xlog_verify_dest_ptr */
3380
3381STATIC void
3382xlog_verify_grant_head(xlog_t *log, int equals)
3383{
3384 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) {
3385 if (equals)
3386 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes);
3387 else
3388 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes);
3389 } else {
3390 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle);
3391 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes);
3392 }
3393} /* xlog_verify_grant_head */
3394
3395/* check if it will fit */
3396STATIC void
3397xlog_verify_tail_lsn(xlog_t *log,
3398 xlog_in_core_t *iclog,
3399 xfs_lsn_t tail_lsn)
3400{
3401 int blocks;
3402
3403 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) {
3404 blocks =
3405 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn));
3406 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize))
3407 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3408 } else {
3409 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle);
3410
3411 if (BLOCK_LSN(tail_lsn) == log->l_prev_block)
3412 xlog_panic("xlog_verify_tail_lsn: tail wrapped");
3413
3414 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block;
3415 if (blocks < BTOBB(iclog->ic_offset) + 1)
3416 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3417 }
3418} /* xlog_verify_tail_lsn */
3419
3420/*
3421 * Perform a number of checks on the iclog before writing to disk.
3422 *
3423 * 1. Make sure the iclogs are still circular
3424 * 2. Make sure we have a good magic number
3425 * 3. Make sure we don't have magic numbers in the data
3426 * 4. Check fields of each log operation header for:
3427 * A. Valid client identifier
3428 * B. tid ptr value falls in valid ptr space (user space code)
3429 * C. Length in log record header is correct according to the
3430 * individual operation headers within record.
3431 * 5. When a bwrite will occur within 5 blocks of the front of the physical
3432 * log, check the preceding blocks of the physical log to make sure all
3433 * the cycle numbers agree with the current cycle number.
3434 */
3435STATIC void
3436xlog_verify_iclog(xlog_t *log,
3437 xlog_in_core_t *iclog,
3438 int count,
3439 boolean_t syncing)
3440{
3441 xlog_op_header_t *ophead;
3442 xlog_in_core_t *icptr;
3443 xlog_in_core_2_t *xhdr;
3444 xfs_caddr_t ptr;
3445 xfs_caddr_t base_ptr;
3446 __psint_t field_offset;
3447 __uint8_t clientid;
3448 int len, i, j, k, op_len;
3449 int idx;
3450 SPLDECL(s);
3451
3452 /* check validity of iclog pointers */
3453 s = LOG_LOCK(log);
3454 icptr = log->l_iclog;
3455 for (i=0; i < log->l_iclog_bufs; i++) {
3456 if (icptr == 0)
3457 xlog_panic("xlog_verify_iclog: invalid ptr");
3458 icptr = icptr->ic_next;
3459 }
3460 if (icptr != log->l_iclog)
3461 xlog_panic("xlog_verify_iclog: corrupt iclog ring");
3462 LOG_UNLOCK(log, s);
3463
3464 /* check log magic numbers */
3465 ptr = (xfs_caddr_t) &(iclog->ic_header);
3466 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM)
3467 xlog_panic("xlog_verify_iclog: invalid magic num");
3468
3469 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count;
3470 ptr += BBSIZE) {
3471 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM)
3472 xlog_panic("xlog_verify_iclog: unexpected magic num");
3473 }
3474
3475 /* check fields */
3476 len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT);
3477 ptr = iclog->ic_datap;
3478 base_ptr = ptr;
3479 ophead = (xlog_op_header_t *)ptr;
3480 xhdr = (xlog_in_core_2_t *)&iclog->ic_header;
3481 for (i = 0; i < len; i++) {
3482 ophead = (xlog_op_header_t *)ptr;
3483
3484 /* clientid is only 1 byte */
3485 field_offset = (__psint_t)
3486 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr);
3487 if (syncing == B_FALSE || (field_offset & 0x1ff)) {
3488 clientid = ophead->oh_clientid;
3489 } else {
3490 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap);
3491 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3492 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3493 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3494 clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT);
3495 } else {
3496 clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT);
3497 }
3498 }
3499 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG)
Christoph Hellwigda1650a2005-11-02 10:21:35 +11003500 cmn_err(CE_WARN, "xlog_verify_iclog: "
3501 "invalid clientid %d op 0x%p offset 0x%lx",
3502 clientid, ophead, (unsigned long)field_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003503
3504 /* check length */
3505 field_offset = (__psint_t)
3506 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr);
3507 if (syncing == B_FALSE || (field_offset & 0x1ff)) {
3508 op_len = INT_GET(ophead->oh_len, ARCH_CONVERT);
3509 } else {
3510 idx = BTOBBT((__psint_t)&ophead->oh_len -
3511 (__psint_t)iclog->ic_datap);
3512 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3513 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3514 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3515 op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT);
3516 } else {
3517 op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT);
3518 }
3519 }
3520 ptr += sizeof(xlog_op_header_t) + op_len;
3521 }
3522} /* xlog_verify_iclog */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11003523#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003524
3525/*
3526 * Mark all iclogs IOERROR. LOG_LOCK is held by the caller.
3527 */
3528STATIC int
3529xlog_state_ioerror(
3530 xlog_t *log)
3531{
3532 xlog_in_core_t *iclog, *ic;
3533
3534 iclog = log->l_iclog;
3535 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) {
3536 /*
3537 * Mark all the incore logs IOERROR.
3538 * From now on, no log flushes will result.
3539 */
3540 ic = iclog;
3541 do {
3542 ic->ic_state = XLOG_STATE_IOERROR;
3543 ic = ic->ic_next;
3544 } while (ic != iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01003545 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003546 }
3547 /*
3548 * Return non-zero, if state transition has already happened.
3549 */
Jesper Juhl014c2542006-01-15 02:37:08 +01003550 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003551}
3552
3553/*
3554 * This is called from xfs_force_shutdown, when we're forcibly
3555 * shutting down the filesystem, typically because of an IO error.
3556 * Our main objectives here are to make sure that:
3557 * a. the filesystem gets marked 'SHUTDOWN' for all interested
3558 * parties to find out, 'atomically'.
3559 * b. those who're sleeping on log reservations, pinned objects and
3560 * other resources get woken up, and be told the bad news.
3561 * c. nothing new gets queued up after (a) and (b) are done.
3562 * d. if !logerror, flush the iclogs to disk, then seal them off
3563 * for business.
3564 */
3565int
3566xfs_log_force_umount(
3567 struct xfs_mount *mp,
3568 int logerror)
3569{
3570 xlog_ticket_t *tic;
3571 xlog_t *log;
3572 int retval;
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003573 int dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003574 SPLDECL(s);
3575 SPLDECL(s2);
3576
3577 log = mp->m_log;
3578
3579 /*
3580 * If this happens during log recovery, don't worry about
3581 * locking; the log isn't open for business yet.
3582 */
3583 if (!log ||
3584 log->l_flags & XLOG_ACTIVE_RECOVERY) {
3585 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
3586 XFS_BUF_DONE(mp->m_sb_bp);
Jesper Juhl014c2542006-01-15 02:37:08 +01003587 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003588 }
3589
3590 /*
3591 * Somebody could've already done the hard work for us.
3592 * No need to get locks for this.
3593 */
3594 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) {
3595 ASSERT(XLOG_FORCED_SHUTDOWN(log));
Jesper Juhl014c2542006-01-15 02:37:08 +01003596 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003597 }
3598 retval = 0;
3599 /*
3600 * We must hold both the GRANT lock and the LOG lock,
3601 * before we mark the filesystem SHUTDOWN and wake
3602 * everybody up to tell the bad news.
3603 */
3604 s = GRANT_LOCK(log);
3605 s2 = LOG_LOCK(log);
3606 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
3607 XFS_BUF_DONE(mp->m_sb_bp);
3608 /*
3609 * This flag is sort of redundant because of the mount flag, but
3610 * it's good to maintain the separation between the log and the rest
3611 * of XFS.
3612 */
3613 log->l_flags |= XLOG_IO_ERROR;
3614
3615 /*
3616 * If we hit a log error, we want to mark all the iclogs IOERROR
3617 * while we're still holding the loglock.
3618 */
3619 if (logerror)
3620 retval = xlog_state_ioerror(log);
3621 LOG_UNLOCK(log, s2);
3622
3623 /*
3624 * We don't want anybody waiting for log reservations
3625 * after this. That means we have to wake up everybody
3626 * queued up on reserve_headq as well as write_headq.
3627 * In addition, we make sure in xlog_{re}grant_log_space
3628 * that we don't enqueue anything once the SHUTDOWN flag
3629 * is set, and this action is protected by the GRANTLOCK.
3630 */
3631 if ((tic = log->l_reserve_headq)) {
3632 do {
3633 sv_signal(&tic->t_sema);
3634 tic = tic->t_next;
3635 } while (tic != log->l_reserve_headq);
3636 }
3637
3638 if ((tic = log->l_write_headq)) {
3639 do {
3640 sv_signal(&tic->t_sema);
3641 tic = tic->t_next;
3642 } while (tic != log->l_write_headq);
3643 }
3644 GRANT_UNLOCK(log, s);
3645
3646 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) {
3647 ASSERT(!logerror);
3648 /*
3649 * Force the incore logs to disk before shutting the
3650 * log down completely.
3651 */
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003652 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003653 s2 = LOG_LOCK(log);
3654 retval = xlog_state_ioerror(log);
3655 LOG_UNLOCK(log, s2);
3656 }
3657 /*
3658 * Wake up everybody waiting on xfs_log_force.
3659 * Callback all log item committed functions as if the
3660 * log writes were completed.
3661 */
3662 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL);
3663
3664#ifdef XFSERRORDEBUG
3665 {
3666 xlog_in_core_t *iclog;
3667
3668 s = LOG_LOCK(log);
3669 iclog = log->l_iclog;
3670 do {
3671 ASSERT(iclog->ic_callback == 0);
3672 iclog = iclog->ic_next;
3673 } while (iclog != log->l_iclog);
3674 LOG_UNLOCK(log, s);
3675 }
3676#endif
3677 /* return non-zero if log IOERROR transition had already happened */
Jesper Juhl014c2542006-01-15 02:37:08 +01003678 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003679}
3680
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10003681STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003682xlog_iclogs_empty(xlog_t *log)
3683{
3684 xlog_in_core_t *iclog;
3685
3686 iclog = log->l_iclog;
3687 do {
3688 /* endianness does not matter here, zero is zero in
3689 * any language.
3690 */
3691 if (iclog->ic_header.h_num_logops)
Jesper Juhl014c2542006-01-15 02:37:08 +01003692 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003693 iclog = iclog->ic_next;
3694 } while (iclog != log->l_iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01003695 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003696}