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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
David Chinnereb01c9c2008-04-10 12:18:46 +100044kmem_zone_t *xfs_log_ticket_zone;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#define xlog_write_adv_cnt(ptr, len, off, bytes) \
47 { (ptr) += (bytes); \
48 (len) -= (bytes); \
49 (off) += (bytes);}
50
51/* Local miscellaneous function prototypes */
52STATIC int xlog_bdstrat_cb(struct xfs_buf *);
53STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket,
54 xlog_in_core_t **, xfs_lsn_t *);
55STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp,
56 xfs_buftarg_t *log_target,
57 xfs_daddr_t blk_offset,
58 int num_bblks);
59STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes);
60STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog);
Nathan Scottc41564b2006-03-29 08:55:14 +100061STATIC void xlog_dealloc_log(xlog_t *log);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[],
63 int nentries, xfs_log_ticket_t tic,
64 xfs_lsn_t *start_lsn,
65 xlog_in_core_t **commit_iclog,
66 uint flags);
67
68/* local state machine functions */
69STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int);
70STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog);
71STATIC int xlog_state_get_iclog_space(xlog_t *log,
72 int len,
73 xlog_in_core_t **iclog,
74 xlog_ticket_t *ticket,
75 int *continued_write,
76 int *logoffsetp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077STATIC int xlog_state_release_iclog(xlog_t *log,
78 xlog_in_core_t *iclog);
79STATIC void xlog_state_switch_iclogs(xlog_t *log,
80 xlog_in_core_t *iclog,
81 int eventual_size);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +110082STATIC int xlog_state_sync(xlog_t *log,
83 xfs_lsn_t lsn,
84 uint flags,
85 int *log_flushed);
86STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog);
88
89/* local functions to manipulate grant head */
90STATIC int xlog_grant_log_space(xlog_t *log,
91 xlog_ticket_t *xtic);
92STATIC void xlog_grant_push_ail(xfs_mount_t *mp,
93 int need_bytes);
94STATIC void xlog_regrant_reserve_log_space(xlog_t *log,
95 xlog_ticket_t *ticket);
96STATIC int xlog_regrant_write_log_space(xlog_t *log,
97 xlog_ticket_t *ticket);
98STATIC void xlog_ungrant_log_space(xlog_t *log,
99 xlog_ticket_t *ticket);
100
101
102/* local ticket functions */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log,
104 int unit_bytes,
105 int count,
106 char clientid,
107 uint flags);
108STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket);
109
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100110#if defined(DEBUG)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr);
112STATIC void xlog_verify_grant_head(xlog_t *log, int equals);
113STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog,
114 int count, boolean_t syncing);
115STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
116 xfs_lsn_t tail_lsn);
117#else
118#define xlog_verify_dest_ptr(a,b)
119#define xlog_verify_grant_head(a,b)
120#define xlog_verify_iclog(a,b,c,d)
121#define xlog_verify_tail_lsn(a,b,c)
122#endif
123
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000124STATIC int xlog_iclogs_empty(xlog_t *log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#if defined(XFS_LOG_TRACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127void
128xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
129{
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000130 unsigned long cnts;
131
132 if (!log->l_grant_trace) {
133 log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP);
134 if (!log->l_grant_trace)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 return;
136 }
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000137 /* ticket counts are 1 byte each */
138 cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 ktrace_enter(log->l_grant_trace,
141 (void *)tic,
142 (void *)log->l_reserve_headq,
143 (void *)log->l_write_headq,
144 (void *)((unsigned long)log->l_grant_reserve_cycle),
145 (void *)((unsigned long)log->l_grant_reserve_bytes),
146 (void *)((unsigned long)log->l_grant_write_cycle),
147 (void *)((unsigned long)log->l_grant_write_bytes),
148 (void *)((unsigned long)log->l_curr_cycle),
149 (void *)((unsigned long)log->l_curr_block),
150 (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)),
151 (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)),
152 (void *)string,
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000153 (void *)((unsigned long)tic->t_trans_type),
154 (void *)cnts,
155 (void *)((unsigned long)tic->t_curr_res),
156 (void *)((unsigned long)tic->t_unit_res));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
159void
160xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
161{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (!iclog->ic_trace)
163 iclog->ic_trace = ktrace_alloc(256, KM_SLEEP);
164 ktrace_enter(iclog->ic_trace,
165 (void *)((unsigned long)state),
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100166 (void *)((unsigned long)current_pid()),
167 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
168 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
169 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
170 (void *)NULL, (void *)NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172#else
173#define xlog_trace_loggrant(log,tic,string)
174#define xlog_trace_iclog(iclog,state)
175#endif /* XFS_LOG_TRACE */
176
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100177
178static void
179xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic)
180{
181 if (*qp) {
182 tic->t_next = (*qp);
183 tic->t_prev = (*qp)->t_prev;
184 (*qp)->t_prev->t_next = tic;
185 (*qp)->t_prev = tic;
186 } else {
187 tic->t_prev = tic->t_next = tic;
188 *qp = tic;
189 }
190
191 tic->t_flags |= XLOG_TIC_IN_Q;
192}
193
194static void
195xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic)
196{
197 if (tic == tic->t_next) {
198 *qp = NULL;
199 } else {
200 *qp = tic->t_next;
201 tic->t_next->t_prev = tic->t_prev;
202 tic->t_prev->t_next = tic->t_next;
203 }
204
205 tic->t_next = tic->t_prev = NULL;
206 tic->t_flags &= ~XLOG_TIC_IN_Q;
207}
208
209static void
210xlog_grant_sub_space(struct log *log, int bytes)
211{
212 log->l_grant_write_bytes -= bytes;
213 if (log->l_grant_write_bytes < 0) {
214 log->l_grant_write_bytes += log->l_logsize;
215 log->l_grant_write_cycle--;
216 }
217
218 log->l_grant_reserve_bytes -= bytes;
219 if ((log)->l_grant_reserve_bytes < 0) {
220 log->l_grant_reserve_bytes += log->l_logsize;
221 log->l_grant_reserve_cycle--;
222 }
223
224}
225
226static void
227xlog_grant_add_space_write(struct log *log, int bytes)
228{
229 log->l_grant_write_bytes += bytes;
230 if (log->l_grant_write_bytes > log->l_logsize) {
231 log->l_grant_write_bytes -= log->l_logsize;
232 log->l_grant_write_cycle++;
233 }
234}
235
236static void
237xlog_grant_add_space_reserve(struct log *log, int bytes)
238{
239 log->l_grant_reserve_bytes += bytes;
240 if (log->l_grant_reserve_bytes > log->l_logsize) {
241 log->l_grant_reserve_bytes -= log->l_logsize;
242 log->l_grant_reserve_cycle++;
243 }
244}
245
246static inline void
247xlog_grant_add_space(struct log *log, int bytes)
248{
249 xlog_grant_add_space_write(log, bytes);
250 xlog_grant_add_space_reserve(log, bytes);
251}
252
Christoph Hellwig0adba532007-08-30 17:21:46 +1000253static void
254xlog_tic_reset_res(xlog_ticket_t *tic)
255{
256 tic->t_res_num = 0;
257 tic->t_res_arr_sum = 0;
258 tic->t_res_num_ophdrs = 0;
259}
260
261static void
262xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type)
263{
264 if (tic->t_res_num == XLOG_TIC_LEN_MAX) {
265 /* add to overflow and start again */
266 tic->t_res_o_flow += tic->t_res_arr_sum;
267 tic->t_res_num = 0;
268 tic->t_res_arr_sum = 0;
269 }
270
271 tic->t_res_arr[tic->t_res_num].r_len = len;
272 tic->t_res_arr[tic->t_res_num].r_type = type;
273 tic->t_res_arr_sum += len;
274 tic->t_res_num++;
275}
Christoph Hellwigdd954c62006-01-11 15:34:50 +1100276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277/*
278 * NOTES:
279 *
280 * 1. currblock field gets updated at startup and after in-core logs
281 * marked as with WANT_SYNC.
282 */
283
284/*
285 * This routine is called when a user of a log manager ticket is done with
286 * the reservation. If the ticket was ever used, then a commit record for
287 * the associated transaction is written out as a log operation header with
288 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with
289 * a given ticket. If the ticket was one with a permanent reservation, then
290 * a few operations are done differently. Permanent reservation tickets by
291 * default don't release the reservation. They just commit the current
292 * transaction with the belief that the reservation is still needed. A flag
293 * must be passed in before permanent reservations are actually released.
294 * When these type of tickets are not released, they need to be set into
295 * the inited state again. By doing this, a start record will be written
296 * out when the next write occurs.
297 */
298xfs_lsn_t
299xfs_log_done(xfs_mount_t *mp,
300 xfs_log_ticket_t xtic,
301 void **iclog,
302 uint flags)
303{
304 xlog_t *log = mp->m_log;
305 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic;
306 xfs_lsn_t lsn = 0;
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (XLOG_FORCED_SHUTDOWN(log) ||
309 /*
310 * If nothing was ever written, don't write out commit record.
311 * If we get an error, just continue and give back the log ticket.
312 */
313 (((ticket->t_flags & XLOG_TIC_INITED) == 0) &&
314 (xlog_commit_record(mp, ticket,
315 (xlog_in_core_t **)iclog, &lsn)))) {
316 lsn = (xfs_lsn_t) -1;
317 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) {
318 flags |= XFS_LOG_REL_PERM_RESERV;
319 }
320 }
321
322
323 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 ||
324 (flags & XFS_LOG_REL_PERM_RESERV)) {
325 /*
Nathan Scottc41564b2006-03-29 08:55:14 +1000326 * Release ticket if not permanent reservation or a specific
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 * request has been made to release a permanent reservation.
328 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000329 xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 xlog_ungrant_log_space(log, ticket);
David Chinnereb01c9c2008-04-10 12:18:46 +1000331 xlog_ticket_put(log, ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 } else {
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000333 xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 xlog_regrant_reserve_log_space(log, ticket);
335 }
336
337 /* If this ticket was a permanent reservation and we aren't
338 * trying to release it, reset the inited flags; so next time
339 * we write, a start record will be written out.
340 */
341 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) &&
342 (flags & XFS_LOG_REL_PERM_RESERV) == 0)
343 ticket->t_flags |= XLOG_TIC_INITED;
344
345 return lsn;
346} /* xfs_log_done */
347
348
349/*
350 * Force the in-core log to disk. If flags == XFS_LOG_SYNC,
351 * the force is done synchronously.
352 *
353 * Asynchronous forces are implemented by setting the WANT_SYNC
354 * bit in the appropriate in-core log and then returning.
355 *
356 * Synchronous forces are implemented with a semaphore. All callers
357 * to force a given lsn to disk will wait on a semaphore attached to the
358 * specific in-core log. When given in-core log finally completes its
359 * write to disk, that thread will wake up all threads waiting on the
360 * semaphore.
361 */
362int
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100363_xfs_log_force(
364 xfs_mount_t *mp,
365 xfs_lsn_t lsn,
366 uint flags,
367 int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100369 xlog_t *log = mp->m_log;
370 int dummy;
371
372 if (!log_flushed)
373 log_flushed = &dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 ASSERT(flags & XFS_LOG_FORCE);
376
377 XFS_STATS_INC(xs_log_force);
378
Christoph Hellwigf538d4d2005-11-02 10:26:59 +1100379 if (log->l_flags & XLOG_IO_ERROR)
380 return XFS_ERROR(EIO);
381 if (lsn == 0)
382 return xlog_state_sync_all(log, flags, log_flushed);
383 else
384 return xlog_state_sync(log, lsn, flags, log_flushed);
David Chinnerb911ca02008-04-10 12:24:30 +1000385} /* _xfs_log_force */
386
387/*
388 * Wrapper for _xfs_log_force(), to be used when caller doesn't care
389 * about errors or whether the log was flushed or not. This is the normal
390 * interface to use when trying to unpin items or move the log forward.
391 */
392void
393xfs_log_force(
394 xfs_mount_t *mp,
395 xfs_lsn_t lsn,
396 uint flags)
397{
398 int error;
399 error = _xfs_log_force(mp, lsn, flags, NULL);
400 if (error) {
401 xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: "
402 "error %d returned.", error);
403 }
404}
405
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407/*
408 * Attaches a new iclog I/O completion callback routine during
409 * transaction commit. If the log is in error state, a non-zero
410 * return code is handed back and the caller is responsible for
411 * executing the callback at an appropriate time.
412 */
413int
414xfs_log_notify(xfs_mount_t *mp, /* mount of partition */
415 void *iclog_hndl, /* iclog to hang callback off */
416 xfs_log_callback_t *cb)
417{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000419 int abortflg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
David Chinner114d23a2008-04-10 12:18:39 +1000421 spin_lock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR);
423 if (!abortflg) {
424 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) ||
425 (iclog->ic_state == XLOG_STATE_WANT_SYNC));
426 cb->cb_next = NULL;
427 *(iclog->ic_callback_tail) = cb;
428 iclog->ic_callback_tail = &(cb->cb_next);
429 }
David Chinner114d23a2008-04-10 12:18:39 +1000430 spin_unlock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 return abortflg;
432} /* xfs_log_notify */
433
434int
435xfs_log_release_iclog(xfs_mount_t *mp,
436 void *iclog_hndl)
437{
438 xlog_t *log = mp->m_log;
439 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
440
441 if (xlog_state_release_iclog(log, iclog)) {
Nathan Scott7d04a332006-06-09 14:58:38 +1000442 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Jesper Juhl014c2542006-01-15 02:37:08 +0100443 return EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 }
445
446 return 0;
447}
448
449/*
450 * 1. Reserve an amount of on-disk log space and return a ticket corresponding
451 * to the reservation.
452 * 2. Potentially, push buffers at tail of log to disk.
453 *
454 * Each reservation is going to reserve extra space for a log record header.
455 * When writes happen to the on-disk log, we don't subtract the length of the
456 * log record header from any reservation. By wasting space in each
457 * reservation, we prevent over allocation problems.
458 */
459int
460xfs_log_reserve(xfs_mount_t *mp,
461 int unit_bytes,
462 int cnt,
463 xfs_log_ticket_t *ticket,
464 __uint8_t client,
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000465 uint flags,
466 uint t_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
468 xlog_t *log = mp->m_log;
469 xlog_ticket_t *internal_ticket;
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100470 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG);
473 ASSERT((flags & XFS_LOG_NOSLEEP) == 0);
474
475 if (XLOG_FORCED_SHUTDOWN(log))
476 return XFS_ERROR(EIO);
477
478 XFS_STATS_INC(xs_try_logspace);
479
480 if (*ticket != NULL) {
481 ASSERT(flags & XFS_LOG_PERM_RESERV);
482 internal_ticket = (xlog_ticket_t *)*ticket;
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000483 xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 xlog_grant_push_ail(mp, internal_ticket->t_unit_res);
485 retval = xlog_regrant_write_log_space(log, internal_ticket);
486 } else {
487 /* may sleep if need to allocate more tickets */
488 internal_ticket = xlog_ticket_get(log, unit_bytes, cnt,
489 client, flags);
David Chinnereb01c9c2008-04-10 12:18:46 +1000490 if (!internal_ticket)
491 return XFS_ERROR(ENOMEM);
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000492 internal_ticket->t_trans_type = t_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 *ticket = internal_ticket;
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000494 xlog_trace_loggrant(log, internal_ticket,
495 (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ?
496 "xfs_log_reserve: create new ticket (permanent trans)" :
497 "xfs_log_reserve: create new ticket");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 xlog_grant_push_ail(mp,
499 (internal_ticket->t_unit_res *
500 internal_ticket->t_cnt));
501 retval = xlog_grant_log_space(log, internal_ticket);
502 }
503
504 return retval;
505} /* xfs_log_reserve */
506
507
508/*
509 * Mount a log filesystem
510 *
511 * mp - ubiquitous xfs mount point structure
512 * log_target - buftarg of on-disk log device
513 * blk_offset - Start block # where block size is 512 bytes (BBSIZE)
514 * num_bblocks - Number of BBSIZE blocks in on-disk log
515 *
516 * Return error or zero.
517 */
518int
David Chinner249a8c12008-02-05 12:13:32 +1100519xfs_log_mount(
520 xfs_mount_t *mp,
521 xfs_buftarg_t *log_target,
522 xfs_daddr_t blk_offset,
523 int num_bblks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
David Chinner249a8c12008-02-05 12:13:32 +1100525 int error;
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
528 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname);
529 else {
530 cmn_err(CE_NOTE,
531 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.",
532 mp->m_fsname);
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000533 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 }
535
536 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 /*
David Chinner249a8c12008-02-05 12:13:32 +1100539 * Initialize the AIL now we have a log.
540 */
541 spin_lock_init(&mp->m_ail_lock);
542 error = xfs_trans_ail_init(mp);
543 if (error) {
544 cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error);
545 goto error;
546 }
547
548 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 * skip log recovery on a norecovery mount. pretend it all
550 * just worked.
551 */
552 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) {
David Chinner249a8c12008-02-05 12:13:32 +1100553 int readonly = (mp->m_flags & XFS_MOUNT_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
555 if (readonly)
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000556 mp->m_flags &= ~XFS_MOUNT_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Eric Sandeen65be6052006-01-11 15:34:19 +1100558 error = xlog_recover(mp->m_log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
560 if (readonly)
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000561 mp->m_flags |= XFS_MOUNT_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 if (error) {
563 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error);
David Chinner249a8c12008-02-05 12:13:32 +1100564 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
566 }
567
568 /* Normal transactions can now occur */
569 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
570
571 /* End mounting message in xfs_log_mount_finish */
572 return 0;
David Chinner249a8c12008-02-05 12:13:32 +1100573error:
574 xfs_log_unmount_dealloc(mp);
575 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576} /* xfs_log_mount */
577
578/*
579 * Finish the recovery of the file system. This is separate from
580 * the xfs_log_mount() call, because it depends on the code in
581 * xfs_mountfs() to read in the root and real-time bitmap inodes
582 * between calling xfs_log_mount() and here.
583 *
584 * mp - ubiquitous xfs mount point structure
585 */
586int
587xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags)
588{
589 int error;
590
591 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
592 error = xlog_recover_finish(mp->m_log, mfsi_flags);
593 else {
594 error = 0;
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000595 ASSERT(mp->m_flags & XFS_MOUNT_RDONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 }
597
598 return error;
599}
600
601/*
602 * Unmount processing for the log.
603 */
604int
605xfs_log_unmount(xfs_mount_t *mp)
606{
607 int error;
608
609 error = xfs_log_unmount_write(mp);
610 xfs_log_unmount_dealloc(mp);
Jesper Juhl014c2542006-01-15 02:37:08 +0100611 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612}
613
614/*
615 * Final log writes as part of unmount.
616 *
617 * Mark the filesystem clean as unmount happens. Note that during relocation
618 * this routine needs to be executed as part of source-bag while the
619 * deallocation must not be done until source-end.
620 */
621
622/*
623 * Unmount record used to have a string "Unmount filesystem--" in the
624 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
625 * We just write the magic number now since that particular field isn't
626 * currently architecture converted and "nUmount" is a bit foo.
627 * As far as I know, there weren't any dependencies on the old behaviour.
628 */
629
630int
631xfs_log_unmount_write(xfs_mount_t *mp)
632{
633 xlog_t *log = mp->m_log;
634 xlog_in_core_t *iclog;
635#ifdef DEBUG
636 xlog_in_core_t *first_iclog;
637#endif
638 xfs_log_iovec_t reg[1];
639 xfs_log_ticket_t tic = NULL;
640 xfs_lsn_t lsn;
641 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
643 /* the data section must be 32 bit size aligned */
644 struct {
645 __uint16_t magic;
646 __uint16_t pad1;
647 __uint32_t pad2; /* may as well make it 64 bits */
648 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 };
649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 /*
651 * Don't write out unmount record on read-only mounts.
652 * Or, if we are doing a forced umount (typically because of IO errors).
653 */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000654 if (mp->m_flags & XFS_MOUNT_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 return 0;
656
David Chinnerb911ca02008-04-10 12:24:30 +1000657 error = _xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC, NULL);
658 ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
660#ifdef DEBUG
661 first_iclog = iclog = log->l_iclog;
662 do {
663 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
664 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE);
665 ASSERT(iclog->ic_offset == 0);
666 }
667 iclog = iclog->ic_next;
668 } while (iclog != first_iclog);
669#endif
670 if (! (XLOG_FORCED_SHUTDOWN(log))) {
671 reg[0].i_addr = (void*)&magic;
672 reg[0].i_len = sizeof(magic);
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000673 XLOG_VEC_SET_TYPE(&reg[0], XLOG_REG_TYPE_UNMOUNT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Tim Shimmin955e47a2006-09-28 11:04:16 +1000675 error = xfs_log_reserve(mp, 600, 1, &tic,
676 XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 if (!error) {
678 /* remove inited flag */
679 ((xlog_ticket_t *)tic)->t_flags = 0;
680 error = xlog_write(mp, reg, 1, tic, &lsn,
681 NULL, XLOG_UNMOUNT_TRANS);
682 /*
683 * At this point, we're umounting anyway,
684 * so there's no point in transitioning log state
685 * to IOERROR. Just continue...
686 */
687 }
688
689 if (error) {
690 xfs_fs_cmn_err(CE_ALERT, mp,
691 "xfs_log_unmount: unmount record failed");
692 }
693
694
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000695 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 iclog = log->l_iclog;
David Chinner155cc6b2008-03-06 13:44:14 +1100697 atomic_inc(&iclog->ic_refcnt);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000698 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 xlog_state_want_sync(log, iclog);
David Chinner1bb7d6b2008-04-10 12:24:38 +1000700 error = xlog_state_release_iclog(log, iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000702 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
704 iclog->ic_state == XLOG_STATE_DIRTY)) {
705 if (!XLOG_FORCED_SHUTDOWN(log)) {
706 sv_wait(&iclog->ic_forcesema, PMEM,
707 &log->l_icloglock, s);
708 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000709 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 }
711 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000712 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
Tim Shimmin955e47a2006-09-28 11:04:16 +1000714 if (tic) {
715 xlog_trace_loggrant(log, tic, "unmount rec");
716 xlog_ungrant_log_space(log, tic);
David Chinnereb01c9c2008-04-10 12:18:46 +1000717 xlog_ticket_put(log, tic);
Tim Shimmin955e47a2006-09-28 11:04:16 +1000718 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 } else {
720 /*
721 * We're already in forced_shutdown mode, couldn't
722 * even attempt to write out the unmount transaction.
723 *
724 * Go through the motions of sync'ing and releasing
725 * the iclog, even though no I/O will actually happen,
Nathan Scottc41564b2006-03-29 08:55:14 +1000726 * we need to wait for other log I/Os that may already
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 * be in progress. Do this as a separate section of
728 * code so we'll know if we ever get stuck here that
729 * we're in this odd situation of trying to unmount
730 * a file system that went into forced_shutdown as
731 * the result of an unmount..
732 */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000733 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 iclog = log->l_iclog;
David Chinner155cc6b2008-03-06 13:44:14 +1100735 atomic_inc(&iclog->ic_refcnt);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000736 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738 xlog_state_want_sync(log, iclog);
David Chinner1bb7d6b2008-04-10 12:24:38 +1000739 error = xlog_state_release_iclog(log, iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000741 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
743 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE
744 || iclog->ic_state == XLOG_STATE_DIRTY
745 || iclog->ic_state == XLOG_STATE_IOERROR) ) {
746
747 sv_wait(&iclog->ic_forcesema, PMEM,
748 &log->l_icloglock, s);
749 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000750 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 }
752 }
753
David Chinner1bb7d6b2008-04-10 12:24:38 +1000754 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755} /* xfs_log_unmount_write */
756
757/*
758 * Deallocate log structures for unmount/relocation.
David Chinner249a8c12008-02-05 12:13:32 +1100759 *
760 * We need to stop the aild from running before we destroy
761 * and deallocate the log as the aild references the log.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 */
763void
764xfs_log_unmount_dealloc(xfs_mount_t *mp)
765{
David Chinner249a8c12008-02-05 12:13:32 +1100766 xfs_trans_ail_destroy(mp);
Nathan Scottc41564b2006-03-29 08:55:14 +1000767 xlog_dealloc_log(mp->m_log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768}
769
770/*
771 * Write region vectors to log. The write happens using the space reservation
772 * of the ticket (tic). It is not a requirement that all writes for a given
773 * transaction occur with one call to xfs_log_write().
774 */
775int
776xfs_log_write(xfs_mount_t * mp,
777 xfs_log_iovec_t reg[],
778 int nentries,
779 xfs_log_ticket_t tic,
780 xfs_lsn_t *start_lsn)
781{
782 int error;
783 xlog_t *log = mp->m_log;
784
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 if (XLOG_FORCED_SHUTDOWN(log))
786 return XFS_ERROR(EIO);
787
788 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) {
Nathan Scott7d04a332006-06-09 14:58:38 +1000789 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 }
Jesper Juhl014c2542006-01-15 02:37:08 +0100791 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792} /* xfs_log_write */
793
794
795void
796xfs_log_move_tail(xfs_mount_t *mp,
797 xfs_lsn_t tail_lsn)
798{
799 xlog_ticket_t *tic;
800 xlog_t *log = mp->m_log;
801 int need_bytes, free_bytes, cycle, bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 if (XLOG_FORCED_SHUTDOWN(log))
804 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
806 if (tail_lsn == 0) {
807 /* needed since sync_lsn is 64 bits */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000808 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 tail_lsn = log->l_last_sync_lsn;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000810 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 }
812
Eric Sandeenc8b5ea22007-10-11 17:37:31 +1000813 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
815 /* Also an invalid lsn. 1 implies that we aren't passing in a valid
816 * tail_lsn.
817 */
818 if (tail_lsn != 1) {
819 log->l_tail_lsn = tail_lsn;
820 }
821
822 if ((tic = log->l_write_headq)) {
823#ifdef DEBUG
824 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
825 panic("Recovery problem");
826#endif
827 cycle = log->l_grant_write_cycle;
828 bytes = log->l_grant_write_bytes;
829 free_bytes = xlog_space_left(log, cycle, bytes);
830 do {
831 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
832
833 if (free_bytes < tic->t_unit_res && tail_lsn != 1)
834 break;
835 tail_lsn = 0;
836 free_bytes -= tic->t_unit_res;
837 sv_signal(&tic->t_sema);
838 tic = tic->t_next;
839 } while (tic != log->l_write_headq);
840 }
841 if ((tic = log->l_reserve_headq)) {
842#ifdef DEBUG
843 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
844 panic("Recovery problem");
845#endif
846 cycle = log->l_grant_reserve_cycle;
847 bytes = log->l_grant_reserve_bytes;
848 free_bytes = xlog_space_left(log, cycle, bytes);
849 do {
850 if (tic->t_flags & XLOG_TIC_PERM_RESERV)
851 need_bytes = tic->t_unit_res*tic->t_cnt;
852 else
853 need_bytes = tic->t_unit_res;
854 if (free_bytes < need_bytes && tail_lsn != 1)
855 break;
856 tail_lsn = 0;
857 free_bytes -= need_bytes;
858 sv_signal(&tic->t_sema);
859 tic = tic->t_next;
860 } while (tic != log->l_reserve_headq);
861 }
Eric Sandeenc8b5ea22007-10-11 17:37:31 +1000862 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863} /* xfs_log_move_tail */
864
865/*
866 * Determine if we have a transaction that has gone to disk
867 * that needs to be covered. Log activity needs to be idle (no AIL and
868 * nothing in the iclogs). And, we need to be in the right state indicating
869 * something has gone out.
870 */
871int
872xfs_log_need_covered(xfs_mount_t *mp)
873{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 int needed = 0, gen;
875 xlog_t *log = mp->m_log;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876
David Chinner92821e22007-05-24 15:26:31 +1000877 if (!xfs_fs_writable(mp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 return 0;
879
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000880 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) ||
882 (log->l_covered_state == XLOG_STATE_COVER_NEED2))
883 && !xfs_trans_first_ail(mp, &gen)
884 && xlog_iclogs_empty(log)) {
885 if (log->l_covered_state == XLOG_STATE_COVER_NEED)
886 log->l_covered_state = XLOG_STATE_COVER_DONE;
887 else {
888 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2);
889 log->l_covered_state = XLOG_STATE_COVER_DONE2;
890 }
891 needed = 1;
892 }
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000893 spin_unlock(&log->l_icloglock);
Jesper Juhl014c2542006-01-15 02:37:08 +0100894 return needed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895}
896
897/******************************************************************************
898 *
899 * local routines
900 *
901 ******************************************************************************
902 */
903
904/* xfs_trans_tail_ail returns 0 when there is nothing in the list.
905 * The log manager must keep track of the last LR which was committed
906 * to disk. The lsn of this LR will become the new tail_lsn whenever
907 * xfs_trans_tail_ail returns 0. If we don't do this, we run into
908 * the situation where stuff could be written into the log but nothing
909 * was ever in the AIL when asked. Eventually, we panic since the
910 * tail hits the head.
911 *
912 * We may be holding the log iclog lock upon entering this routine.
913 */
914xfs_lsn_t
915xlog_assign_tail_lsn(xfs_mount_t *mp)
916{
917 xfs_lsn_t tail_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 xlog_t *log = mp->m_log;
919
920 tail_lsn = xfs_trans_tail_ail(mp);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +1000921 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 if (tail_lsn != 0) {
923 log->l_tail_lsn = tail_lsn;
924 } else {
925 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn;
926 }
Eric Sandeenc8b5ea22007-10-11 17:37:31 +1000927 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929 return tail_lsn;
930} /* xlog_assign_tail_lsn */
931
932
933/*
934 * Return the space in the log between the tail and the head. The head
935 * is passed in the cycle/bytes formal parms. In the special case where
936 * the reserve head has wrapped passed the tail, this calculation is no
937 * longer valid. In this case, just return 0 which means there is no space
938 * in the log. This works for all places where this function is called
939 * with the reserve head. Of course, if the write head were to ever
940 * wrap the tail, we should blow up. Rather than catch this case here,
941 * we depend on other ASSERTions in other parts of the code. XXXmiken
942 *
943 * This code also handles the case where the reservation head is behind
944 * the tail. The details of this case are described below, but the end
945 * result is that we return the size of the log as the amount of space left.
946 */
David Chinnera8272ce2007-11-23 16:28:09 +1100947STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948xlog_space_left(xlog_t *log, int cycle, int bytes)
949{
950 int free_bytes;
951 int tail_bytes;
952 int tail_cycle;
953
954 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn));
955 tail_cycle = CYCLE_LSN(log->l_tail_lsn);
956 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) {
957 free_bytes = log->l_logsize - (bytes - tail_bytes);
958 } else if ((tail_cycle + 1) < cycle) {
959 return 0;
960 } else if (tail_cycle < cycle) {
961 ASSERT(tail_cycle == (cycle - 1));
962 free_bytes = tail_bytes - bytes;
963 } else {
964 /*
965 * The reservation head is behind the tail.
966 * In this case we just want to return the size of the
967 * log as the amount of space left.
968 */
969 xfs_fs_cmn_err(CE_ALERT, log->l_mp,
970 "xlog_space_left: head behind tail\n"
971 " tail_cycle = %d, tail_bytes = %d\n"
972 " GH cycle = %d, GH bytes = %d",
973 tail_cycle, tail_bytes, cycle, bytes);
974 ASSERT(0);
975 free_bytes = log->l_logsize;
976 }
977 return free_bytes;
978} /* xlog_space_left */
979
980
981/*
982 * Log function which is called when an io completes.
983 *
984 * The log manager needs its own routine, in order to control what
985 * happens with the buffer after the write completes.
986 */
987void
988xlog_iodone(xfs_buf_t *bp)
989{
990 xlog_in_core_t *iclog;
991 xlog_t *l;
992 int aborted;
993
994 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *);
995 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2);
996 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
997 aborted = 0;
998
999 /*
1000 * Some versions of cpp barf on the recursive definition of
1001 * ic_log -> hic_fields.ic_log and expand ic_log twice when
1002 * it is passed through two macros. Workaround broken cpp.
1003 */
1004 l = iclog->ic_log;
1005
1006 /*
David Chinner0bfefc42007-05-14 18:24:23 +10001007 * If the ordered flag has been removed by a lower
1008 * layer, it means the underlyin device no longer supports
1009 * barrier I/O. Warn loudly and turn off barriers.
1010 */
1011 if ((l->l_mp->m_flags & XFS_MOUNT_BARRIER) && !XFS_BUF_ORDERED(bp)) {
1012 l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER;
1013 xfs_fs_cmn_err(CE_WARN, l->l_mp,
1014 "xlog_iodone: Barriers are no longer supported"
1015 " by device. Disabling barriers\n");
1016 xfs_buftrace("XLOG_IODONE BARRIERS OFF", bp);
1017 }
1018
1019 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 * Race to shutdown the filesystem if we see an error.
1021 */
1022 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp,
1023 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) {
1024 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp));
1025 XFS_BUF_STALE(bp);
Nathan Scott7d04a332006-06-09 14:58:38 +10001026 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 /*
1028 * This flag will be propagated to the trans-committed
1029 * callback routines to let them know that the log-commit
1030 * didn't succeed.
1031 */
1032 aborted = XFS_LI_ABORTED;
1033 } else if (iclog->ic_state & XLOG_STATE_IOERROR) {
1034 aborted = XFS_LI_ABORTED;
1035 }
David Chinner3db296f2007-05-14 18:24:16 +10001036
1037 /* log I/O is always issued ASYNC */
1038 ASSERT(XFS_BUF_ISASYNC(bp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 xlog_state_done_syncing(iclog, aborted);
David Chinner3db296f2007-05-14 18:24:16 +10001040 /*
1041 * do not reference the buffer (bp) here as we could race
1042 * with it being freed after writing the unmount record to the
1043 * log.
1044 */
1045
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046} /* xlog_iodone */
1047
1048/*
1049 * The bdstrat callback function for log bufs. This gives us a central
1050 * place to trap bufs in case we get hit by a log I/O error and need to
1051 * shutdown. Actually, in practice, even when we didn't get a log error,
1052 * we transition the iclogs to IOERROR state *after* flushing all existing
1053 * iclogs to disk. This is because we don't want anymore new transactions to be
1054 * started or completed afterwards.
1055 */
1056STATIC int
1057xlog_bdstrat_cb(struct xfs_buf *bp)
1058{
1059 xlog_in_core_t *iclog;
1060
1061 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *);
1062
1063 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) {
1064 /* note for irix bstrat will need struct bdevsw passed
1065 * Fix the following macro if the code ever is merged
1066 */
1067 XFS_bdstrat(bp);
1068 return 0;
1069 }
1070
1071 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp);
1072 XFS_BUF_ERROR(bp, EIO);
1073 XFS_BUF_STALE(bp);
1074 xfs_biodone(bp);
Jesper Juhl014c2542006-01-15 02:37:08 +01001075 return XFS_ERROR(EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
1077
1078}
1079
1080/*
1081 * Return size of each in-core log record buffer.
1082 *
Eric Sandeen1cb51252007-08-16 16:24:43 +10001083 * All machines get 8 x 32KB buffers by default, unless tuned otherwise.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 *
1085 * If the filesystem blocksize is too large, we may need to choose a
1086 * larger size since the directory code currently logs entire blocks.
1087 */
1088
1089STATIC void
1090xlog_get_iclog_buffer_size(xfs_mount_t *mp,
1091 xlog_t *log)
1092{
1093 int size;
1094 int xhdrs;
1095
Eric Sandeen1cb51252007-08-16 16:24:43 +10001096 if (mp->m_logbufs <= 0)
1097 log->l_iclog_bufs = XLOG_MAX_ICLOGS;
1098 else
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001099 log->l_iclog_bufs = mp->m_logbufs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
1101 /*
1102 * Buffer size passed in from mount system call.
1103 */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001104 if (mp->m_logbsize > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 size = log->l_iclog_size = mp->m_logbsize;
1106 log->l_iclog_size_log = 0;
1107 while (size != 1) {
1108 log->l_iclog_size_log++;
1109 size >>= 1;
1110 }
1111
Eric Sandeen62118702008-03-06 13:44:28 +11001112 if (xfs_sb_version_haslogv2(&mp->m_sb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 /* # headers = size / 32K
1114 * one header holds cycles from 32K of data
1115 */
1116
1117 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE;
1118 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE)
1119 xhdrs++;
1120 log->l_iclog_hsize = xhdrs << BBSHIFT;
1121 log->l_iclog_heads = xhdrs;
1122 } else {
1123 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE);
1124 log->l_iclog_hsize = BBSIZE;
1125 log->l_iclog_heads = 1;
1126 }
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001127 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 }
1129
Eric Sandeen1cb51252007-08-16 16:24:43 +10001130 /* All machines use 32KB buffers by default. */
1131 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE;
1132 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
1134 /* the default log size is 16k or 32k which is one header sector */
1135 log->l_iclog_hsize = BBSIZE;
1136 log->l_iclog_heads = 1;
1137
1138 /*
1139 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use
1140 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers.
1141 */
1142 if (mp->m_sb.sb_blocksize >= 16*1024) {
1143 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE;
1144 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001145 if (mp->m_logbufs <= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 switch (mp->m_sb.sb_blocksize) {
1147 case 16*1024: /* 16 KB */
1148 log->l_iclog_bufs = 3;
1149 break;
1150 case 32*1024: /* 32 KB */
1151 log->l_iclog_bufs = 4;
1152 break;
1153 case 64*1024: /* 64 KB */
1154 log->l_iclog_bufs = 8;
1155 break;
1156 default:
1157 xlog_panic("XFS: Invalid blocksize");
1158 break;
1159 }
1160 }
1161 }
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11001162
1163done: /* are we being asked to make the sizes selected above visible? */
1164 if (mp->m_logbufs == 0)
1165 mp->m_logbufs = log->l_iclog_bufs;
1166 if (mp->m_logbsize == 0)
1167 mp->m_logbsize = log->l_iclog_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168} /* xlog_get_iclog_buffer_size */
1169
1170
1171/*
1172 * This routine initializes some of the log structure for a given mount point.
1173 * Its primary purpose is to fill in enough, so recovery can occur. However,
1174 * some other stuff may be filled in too.
1175 */
1176STATIC xlog_t *
1177xlog_alloc_log(xfs_mount_t *mp,
1178 xfs_buftarg_t *log_target,
1179 xfs_daddr_t blk_offset,
1180 int num_bblks)
1181{
1182 xlog_t *log;
1183 xlog_rec_header_t *head;
1184 xlog_in_core_t **iclogp;
1185 xlog_in_core_t *iclog, *prev_iclog=NULL;
1186 xfs_buf_t *bp;
1187 int i;
1188 int iclogsize;
1189
1190 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP);
1191
1192 log->l_mp = mp;
1193 log->l_targ = log_target;
1194 log->l_logsize = BBTOB(num_bblks);
1195 log->l_logBBstart = blk_offset;
1196 log->l_logBBsize = num_bblks;
1197 log->l_covered_state = XLOG_STATE_COVER_IDLE;
1198 log->l_flags |= XLOG_ACTIVE_RECOVERY;
1199
1200 log->l_prev_block = -1;
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10001201 log->l_tail_lsn = xlog_assign_lsn(1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
1203 log->l_last_sync_lsn = log->l_tail_lsn;
1204 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */
1205 log->l_grant_reserve_cycle = 1;
1206 log->l_grant_write_cycle = 1;
1207
Eric Sandeen62118702008-03-06 13:44:28 +11001208 if (xfs_sb_version_hassector(&mp->m_sb)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
1210 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log);
1211 /* for larger sector sizes, must have v2 or external log */
1212 ASSERT(log->l_sectbb_log == 0 ||
1213 log->l_logBBstart == 0 ||
Eric Sandeen62118702008-03-06 13:44:28 +11001214 xfs_sb_version_haslogv2(&mp->m_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
1216 }
1217 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1;
1218
1219 xlog_get_iclog_buffer_size(mp, log);
1220
1221 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp);
1222 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone);
1223 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb);
1224 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
1225 ASSERT(XFS_BUF_ISBUSY(bp));
1226 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
1227 log->l_xbuf = bp;
1228
Eric Sandeen007c61c2007-10-11 17:43:56 +10001229 spin_lock_init(&log->l_icloglock);
1230 spin_lock_init(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 initnsema(&log->l_flushsema, 0, "ic-flush");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
1233 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
1234 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
1235
1236 iclogp = &log->l_iclog;
1237 /*
1238 * The amount of memory to allocate for the iclog structure is
1239 * rather funky due to the way the structure is defined. It is
1240 * done this way so that we can use different sizes for machines
1241 * with different amounts of memory. See the definition of
1242 * xlog_in_core_t in xfs_log_priv.h for details.
1243 */
1244 iclogsize = log->l_iclog_size;
1245 ASSERT(log->l_iclog_size >= 4096);
1246 for (i=0; i < log->l_iclog_bufs; i++) {
1247 *iclogp = (xlog_in_core_t *)
1248 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP);
1249 iclog = *iclogp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 iclog->ic_prev = prev_iclog;
1251 prev_iclog = iclog;
Christoph Hellwig1fa40b02007-05-14 18:23:50 +10001252
1253 bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp);
1254 if (!XFS_BUF_CPSEMA(bp))
1255 ASSERT(0);
1256 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone);
1257 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb);
1258 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
1259 iclog->ic_bp = bp;
1260 iclog->hic_data = bp->b_addr;
David Chinner4679b2d2008-04-10 12:18:54 +10001261#ifdef DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header);
David Chinner4679b2d2008-04-10 12:18:54 +10001263#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 head = &iclog->ic_header;
1265 memset(head, 0, sizeof(xlog_rec_header_t));
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001266 head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
1267 head->h_version = cpu_to_be32(
Eric Sandeen62118702008-03-06 13:44:28 +11001268 xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001269 head->h_size = cpu_to_be32(log->l_iclog_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 /* new fields */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001271 head->h_fmt = cpu_to_be32(XLOG_FMT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t));
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize;
1275 iclog->ic_state = XLOG_STATE_ACTIVE;
1276 iclog->ic_log = log;
David Chinner114d23a2008-04-10 12:18:39 +10001277 atomic_set(&iclog->ic_refcnt, 0);
1278 spin_lock_init(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 iclog->ic_callback_tail = &(iclog->ic_callback);
1280 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize;
1281
1282 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp));
1283 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0);
1284 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force");
1285 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write");
1286
1287 iclogp = &iclog->ic_next;
1288 }
1289 *iclogp = log->l_iclog; /* complete ring */
1290 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */
1291
1292 return log;
1293} /* xlog_alloc_log */
1294
1295
1296/*
1297 * Write out the commit record of a transaction associated with the given
1298 * ticket. Return the lsn of the commit record.
1299 */
1300STATIC int
1301xlog_commit_record(xfs_mount_t *mp,
1302 xlog_ticket_t *ticket,
1303 xlog_in_core_t **iclog,
1304 xfs_lsn_t *commitlsnp)
1305{
1306 int error;
1307 xfs_log_iovec_t reg[1];
1308
1309 reg[0].i_addr = NULL;
1310 reg[0].i_len = 0;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001311 XLOG_VEC_SET_TYPE(&reg[0], XLOG_REG_TYPE_COMMIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
1313 ASSERT_ALWAYS(iclog);
1314 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp,
1315 iclog, XLOG_COMMIT_TRANS))) {
Nathan Scott7d04a332006-06-09 14:58:38 +10001316 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001318 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319} /* xlog_commit_record */
1320
1321
1322/*
1323 * Push on the buffer cache code if we ever use more than 75% of the on-disk
1324 * log space. This code pushes on the lsn which would supposedly free up
1325 * the 25% which we want to leave free. We may need to adopt a policy which
1326 * pushes on an lsn which is further along in the log once we reach the high
1327 * water mark. In this manner, we would be creating a low water mark.
1328 */
David Chinnera8272ce2007-11-23 16:28:09 +11001329STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330xlog_grant_push_ail(xfs_mount_t *mp,
1331 int need_bytes)
1332{
1333 xlog_t *log = mp->m_log; /* pointer to the log */
1334 xfs_lsn_t tail_lsn; /* lsn of the log tail */
1335 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */
1336 int free_blocks; /* free blocks left to write to */
1337 int free_bytes; /* free bytes left to write to */
1338 int threshold_block; /* block in lsn we'd like to be at */
1339 int threshold_cycle; /* lsn cycle we'd like to be at */
1340 int free_threshold;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341
1342 ASSERT(BTOBB(need_bytes) < log->l_logBBsize);
1343
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10001344 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 free_bytes = xlog_space_left(log,
1346 log->l_grant_reserve_cycle,
1347 log->l_grant_reserve_bytes);
1348 tail_lsn = log->l_tail_lsn;
1349 free_blocks = BTOBBT(free_bytes);
1350
1351 /*
1352 * Set the threshold for the minimum number of free blocks in the
1353 * log to the maximum of what the caller needs, one quarter of the
1354 * log, and 256 blocks.
1355 */
1356 free_threshold = BTOBB(need_bytes);
1357 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2));
1358 free_threshold = MAX(free_threshold, 256);
1359 if (free_blocks < free_threshold) {
1360 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold;
1361 threshold_cycle = CYCLE_LSN(tail_lsn);
1362 if (threshold_block >= log->l_logBBsize) {
1363 threshold_block -= log->l_logBBsize;
1364 threshold_cycle += 1;
1365 }
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10001366 threshold_lsn = xlog_assign_lsn(threshold_cycle, threshold_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
1368 /* Don't pass in an lsn greater than the lsn of the last
1369 * log record known to be on disk.
1370 */
1371 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0)
1372 threshold_lsn = log->l_last_sync_lsn;
1373 }
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10001374 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
1376 /*
1377 * Get the transaction layer to kick the dirty buffers out to
1378 * disk asynchronously. No point in trying to do this if
1379 * the filesystem is shutting down.
1380 */
1381 if (threshold_lsn &&
1382 !XLOG_FORCED_SHUTDOWN(log))
1383 xfs_trans_push_ail(mp, threshold_lsn);
1384} /* xlog_grant_push_ail */
1385
1386
1387/*
1388 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous
1389 * fashion. Previously, we should have moved the current iclog
1390 * ptr in the log to point to the next available iclog. This allows further
1391 * write to continue while this code syncs out an iclog ready to go.
1392 * Before an in-core log can be written out, the data section must be scanned
1393 * to save away the 1st word of each BBSIZE block into the header. We replace
1394 * it with the current cycle count. Each BBSIZE block is tagged with the
1395 * cycle count because there in an implicit assumption that drives will
1396 * guarantee that entire 512 byte blocks get written at once. In other words,
1397 * we can't have part of a 512 byte block written and part not written. By
1398 * tagging each block, we will know which blocks are valid when recovering
1399 * after an unclean shutdown.
1400 *
1401 * This routine is single threaded on the iclog. No other thread can be in
1402 * this routine with the same iclog. Changing contents of iclog can there-
1403 * fore be done without grabbing the state machine lock. Updating the global
1404 * log will require grabbing the lock though.
1405 *
1406 * The entire log manager uses a logical block numbering scheme. Only
1407 * log_sync (and then only bwrite()) know about the fact that the log may
1408 * not start with block zero on a given device. The log block start offset
1409 * is added immediately before calling bwrite().
1410 */
1411
David Chinnera8272ce2007-11-23 16:28:09 +11001412STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413xlog_sync(xlog_t *log,
1414 xlog_in_core_t *iclog)
1415{
1416 xfs_caddr_t dptr; /* pointer to byte sized element */
1417 xfs_buf_t *bp;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001418 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 uint count; /* byte count of bwrite */
1420 uint count_init; /* initial count before roundup */
1421 int roundoff; /* roundoff to BB or stripe */
1422 int split = 0; /* split write into two regions */
1423 int error;
Eric Sandeen62118702008-03-06 13:44:28 +11001424 int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
1426 XFS_STATS_INC(xs_log_writes);
David Chinner155cc6b2008-03-06 13:44:14 +11001427 ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
1429 /* Add for LR header */
1430 count_init = log->l_iclog_hsize + iclog->ic_offset;
1431
1432 /* Round out the log write size */
1433 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) {
1434 /* we have a v2 stripe unit to use */
1435 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
1436 } else {
1437 count = BBTOB(BTOBB(count_init));
1438 }
1439 roundoff = count - count_init;
1440 ASSERT(roundoff >= 0);
1441 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 &&
1442 roundoff < log->l_mp->m_sb.sb_logsunit)
1443 ||
1444 (log->l_mp->m_sb.sb_logsunit <= 1 &&
1445 roundoff < BBTOB(1)));
1446
1447 /* move grant heads by roundoff in sync */
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10001448 spin_lock(&log->l_grant_lock);
Christoph Hellwigdd954c62006-01-11 15:34:50 +11001449 xlog_grant_add_space(log, roundoff);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10001450 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
1452 /* put cycle number in every block */
1453 xlog_pack_data(log, iclog, roundoff);
1454
1455 /* real byte length */
1456 if (v2) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001457 iclog->ic_header.h_len =
1458 cpu_to_be32(iclog->ic_offset + roundoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 } else {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001460 iclog->ic_header.h_len =
1461 cpu_to_be32(iclog->ic_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 }
1463
Nathan Scottf5faad72006-07-28 17:04:44 +10001464 bp = iclog->ic_bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1);
1466 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001467 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468
1469 XFS_STATS_ADD(xs_log_blocks, BTOBB(count));
1470
1471 /* Do we need to split this write into 2 parts? */
1472 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) {
1473 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)));
1474 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp));
1475 iclog->ic_bwritecnt = 2; /* split into 2 writes */
1476 } else {
1477 iclog->ic_bwritecnt = 1;
1478 }
David Chinner511105b2007-05-24 15:21:57 +10001479 XFS_BUF_SET_COUNT(bp, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */
Nathan Scottf5faad72006-07-28 17:04:44 +10001481 XFS_BUF_ZEROFLAGS(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 XFS_BUF_BUSY(bp);
1483 XFS_BUF_ASYNC(bp);
1484 /*
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001485 * Do an ordered write for the log block.
Nathan Scottf5faad72006-07-28 17:04:44 +10001486 * Its unnecessary to flush the first split block in the log wrap case.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 */
Nathan Scottf5faad72006-07-28 17:04:44 +10001488 if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER))
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001489 XFS_BUF_ORDERED(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
1491 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1492 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1493
1494 xlog_verify_iclog(log, iclog, count, B_TRUE);
1495
1496 /* account for log which doesn't start at block #0 */
1497 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1498 /*
1499 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem
1500 * is shutting down.
1501 */
1502 XFS_BUF_WRITE(bp);
1503
1504 if ((error = XFS_bwrite(bp))) {
1505 xfs_ioerror_alert("xlog_sync", log->l_mp, bp,
1506 XFS_BUF_ADDR(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001507 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 }
1509 if (split) {
Nathan Scottf5faad72006-07-28 17:04:44 +10001510 bp = iclog->ic_log->l_xbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) ==
1512 (unsigned long)1);
1513 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2);
1514 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */
1515 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+
1516 (__psint_t)count), split);
1517 XFS_BUF_SET_FSPRIVATE(bp, iclog);
Nathan Scottf5faad72006-07-28 17:04:44 +10001518 XFS_BUF_ZEROFLAGS(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 XFS_BUF_BUSY(bp);
1520 XFS_BUF_ASYNC(bp);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001521 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
1522 XFS_BUF_ORDERED(bp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 dptr = XFS_BUF_PTR(bp);
1524 /*
1525 * Bump the cycle numbers at the start of each block
1526 * since this part of the buffer is at the start of
1527 * a new cycle. Watch out for the header magic number
1528 * case, though.
1529 */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001530 for (i = 0; i < split; i += BBSIZE) {
Marcin Slusarz413d57c2008-02-13 15:03:29 -08001531 be32_add_cpu((__be32 *)dptr, 1);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001532 if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM)
Marcin Slusarz413d57c2008-02-13 15:03:29 -08001533 be32_add_cpu((__be32 *)dptr, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 dptr += BBSIZE;
1535 }
1536
1537 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1538 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1539
Nathan Scottc41564b2006-03-29 08:55:14 +10001540 /* account for internal log which doesn't start at block #0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1542 XFS_BUF_WRITE(bp);
1543 if ((error = XFS_bwrite(bp))) {
1544 xfs_ioerror_alert("xlog_sync (split)", log->l_mp,
1545 bp, XFS_BUF_ADDR(bp));
Jesper Juhl014c2542006-01-15 02:37:08 +01001546 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 }
1548 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001549 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550} /* xlog_sync */
1551
1552
1553/*
Nathan Scottc41564b2006-03-29 08:55:14 +10001554 * Deallocate a log structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 */
David Chinnera8272ce2007-11-23 16:28:09 +11001556STATIC void
Nathan Scottc41564b2006-03-29 08:55:14 +10001557xlog_dealloc_log(xlog_t *log)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558{
1559 xlog_in_core_t *iclog, *next_iclog;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 int i;
1561
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 iclog = log->l_iclog;
1563 for (i=0; i<log->l_iclog_bufs; i++) {
1564 sv_destroy(&iclog->ic_forcesema);
1565 sv_destroy(&iclog->ic_writesema);
1566 xfs_buf_free(iclog->ic_bp);
1567#ifdef XFS_LOG_TRACE
1568 if (iclog->ic_trace != NULL) {
1569 ktrace_free(iclog->ic_trace);
1570 }
1571#endif
1572 next_iclog = iclog->ic_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 kmem_free(iclog, sizeof(xlog_in_core_t));
1574 iclog = next_iclog;
1575 }
1576 freesema(&log->l_flushsema);
1577 spinlock_destroy(&log->l_icloglock);
1578 spinlock_destroy(&log->l_grant_lock);
1579
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 xfs_buf_free(log->l_xbuf);
1581#ifdef XFS_LOG_TRACE
1582 if (log->l_trace != NULL) {
1583 ktrace_free(log->l_trace);
1584 }
1585 if (log->l_grant_trace != NULL) {
1586 ktrace_free(log->l_grant_trace);
1587 }
1588#endif
1589 log->l_mp->m_log = NULL;
1590 kmem_free(log, sizeof(xlog_t));
Nathan Scottc41564b2006-03-29 08:55:14 +10001591} /* xlog_dealloc_log */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
1593/*
1594 * Update counters atomically now that memcpy is done.
1595 */
1596/* ARGSUSED */
1597static inline void
1598xlog_state_finish_copy(xlog_t *log,
1599 xlog_in_core_t *iclog,
1600 int record_cnt,
1601 int copy_bytes)
1602{
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10001603 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604
Marcin Slusarz413d57c2008-02-13 15:03:29 -08001605 be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 iclog->ic_offset += copy_bytes;
1607
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10001608 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609} /* xlog_state_finish_copy */
1610
1611
1612
1613
1614/*
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001615 * print out info relating to regions written which consume
1616 * the reservation
1617 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001618STATIC void
1619xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket)
1620{
1621 uint i;
1622 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t);
1623
1624 /* match with XLOG_REG_TYPE_* in xfs_log.h */
1625 static char *res_type_str[XLOG_REG_TYPE_MAX] = {
1626 "bformat",
1627 "bchunk",
1628 "efi_format",
1629 "efd_format",
1630 "iformat",
1631 "icore",
1632 "iext",
1633 "ibroot",
1634 "ilocal",
1635 "iattr_ext",
1636 "iattr_broot",
1637 "iattr_local",
1638 "qformat",
1639 "dquot",
1640 "quotaoff",
1641 "LR header",
1642 "unmount",
1643 "commit",
1644 "trans header"
1645 };
1646 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = {
1647 "SETATTR_NOT_SIZE",
1648 "SETATTR_SIZE",
1649 "INACTIVE",
1650 "CREATE",
1651 "CREATE_TRUNC",
1652 "TRUNCATE_FILE",
1653 "REMOVE",
1654 "LINK",
1655 "RENAME",
1656 "MKDIR",
1657 "RMDIR",
1658 "SYMLINK",
1659 "SET_DMATTRS",
1660 "GROWFS",
1661 "STRAT_WRITE",
1662 "DIOSTRAT",
1663 "WRITE_SYNC",
1664 "WRITEID",
1665 "ADDAFORK",
1666 "ATTRINVAL",
1667 "ATRUNCATE",
1668 "ATTR_SET",
1669 "ATTR_RM",
1670 "ATTR_FLAG",
1671 "CLEAR_AGI_BUCKET",
1672 "QM_SBCHANGE",
1673 "DUMMY1",
1674 "DUMMY2",
1675 "QM_QUOTAOFF",
1676 "QM_DQALLOC",
1677 "QM_SETQLIM",
1678 "QM_DQCLUSTER",
1679 "QM_QINOCREATE",
1680 "QM_QUOTAOFF_END",
1681 "SB_UNIT",
1682 "FSYNC_TS",
1683 "GROWFSRT_ALLOC",
1684 "GROWFSRT_ZERO",
1685 "GROWFSRT_FREE",
1686 "SWAPEXT"
1687 };
1688
1689 xfs_fs_cmn_err(CE_WARN, mp,
1690 "xfs_log_write: reservation summary:\n"
1691 " trans type = %s (%u)\n"
1692 " unit res = %d bytes\n"
1693 " current res = %d bytes\n"
1694 " total reg = %u bytes (o/flow = %u bytes)\n"
1695 " ophdrs = %u (ophdr space = %u bytes)\n"
1696 " ophdr + reg = %u bytes\n"
1697 " num regions = %u\n",
1698 ((ticket->t_trans_type <= 0 ||
1699 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ?
1700 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]),
1701 ticket->t_trans_type,
1702 ticket->t_unit_res,
1703 ticket->t_curr_res,
1704 ticket->t_res_arr_sum, ticket->t_res_o_flow,
1705 ticket->t_res_num_ophdrs, ophdr_spc,
1706 ticket->t_res_arr_sum +
Tim Shimmin12598452006-01-11 21:02:47 +11001707 ticket->t_res_o_flow + ophdr_spc,
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001708 ticket->t_res_num);
1709
1710 for (i = 0; i < ticket->t_res_num; i++) {
Tim Shimmin12598452006-01-11 21:02:47 +11001711 uint r_type = ticket->t_res_arr[i].r_type;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001712 cmn_err(CE_WARN,
1713 "region[%u]: %s - %u bytes\n",
1714 i,
1715 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ?
1716 "bad-rtype" : res_type_str[r_type-1]),
1717 ticket->t_res_arr[i].r_len);
1718 }
1719}
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001720
1721/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 * Write some region out to in-core log
1723 *
1724 * This will be called when writing externally provided regions or when
1725 * writing out a commit record for a given transaction.
1726 *
1727 * General algorithm:
1728 * 1. Find total length of this write. This may include adding to the
1729 * lengths passed in.
1730 * 2. Check whether we violate the tickets reservation.
1731 * 3. While writing to this iclog
1732 * A. Reserve as much space in this iclog as can get
1733 * B. If this is first write, save away start lsn
1734 * C. While writing this region:
1735 * 1. If first write of transaction, write start record
1736 * 2. Write log operation header (header per region)
1737 * 3. Find out if we can fit entire region into this iclog
1738 * 4. Potentially, verify destination memcpy ptr
1739 * 5. Memcpy (partial) region
1740 * 6. If partial copy, release iclog; otherwise, continue
1741 * copying more regions into current iclog
1742 * 4. Mark want sync bit (in simulation mode)
1743 * 5. Release iclog for potential flush to on-disk log.
1744 *
1745 * ERRORS:
1746 * 1. Panic if reservation is overrun. This should never happen since
1747 * reservation amounts are generated internal to the filesystem.
1748 * NOTES:
1749 * 1. Tickets are single threaded data structures.
1750 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the
1751 * syncing routine. When a single log_write region needs to span
1752 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set
1753 * on all log operation writes which don't contain the end of the
1754 * region. The XLOG_END_TRANS bit is used for the in-core log
1755 * operation which contains the end of the continued log_write region.
1756 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog,
1757 * we don't really know exactly how much space will be used. As a result,
1758 * we don't update ic_offset until the end when we know exactly how many
1759 * bytes have been written out.
1760 */
David Chinnera8272ce2007-11-23 16:28:09 +11001761STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762xlog_write(xfs_mount_t * mp,
1763 xfs_log_iovec_t reg[],
1764 int nentries,
1765 xfs_log_ticket_t tic,
1766 xfs_lsn_t *start_lsn,
1767 xlog_in_core_t **commit_iclog,
1768 uint flags)
1769{
Nathan Scott5493a0f2006-06-28 11:17:28 +10001770 xlog_t *log = mp->m_log;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 xlog_ticket_t *ticket = (xlog_ticket_t *)tic;
Nathan Scott5493a0f2006-06-28 11:17:28 +10001772 xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 xlog_op_header_t *logop_head; /* ptr to log operation header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 __psint_t ptr; /* copy address into data region */
1775 int len; /* # xlog_write() bytes 2 still copy */
1776 int index; /* region index currently copying */
1777 int log_offset; /* offset (from 0) into data region */
1778 int start_rec_copy; /* # bytes to copy for start record */
1779 int partial_copy; /* did we split a region? */
1780 int partial_copy_len;/* # bytes copied if split region */
1781 int need_copy; /* # bytes need to memcpy this region */
1782 int copy_len; /* # bytes actually memcpy'ing */
1783 int copy_off; /* # bytes from entry start */
1784 int contwr; /* continued write of in-core log? */
1785 int error;
1786 int record_cnt = 0, data_cnt = 0;
1787
1788 partial_copy_len = partial_copy = 0;
1789
1790 /* Calculate potential maximum space. Each region gets its own
1791 * xlog_op_header_t and may need to be double word aligned.
1792 */
1793 len = 0;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001794 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 len += sizeof(xlog_op_header_t);
Christoph Hellwig0adba532007-08-30 17:21:46 +10001796 ticket->t_res_num_ophdrs++;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001797 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798
1799 for (index = 0; index < nentries; index++) {
1800 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */
Christoph Hellwig0adba532007-08-30 17:21:46 +10001801 ticket->t_res_num_ophdrs++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 len += reg[index].i_len;
Christoph Hellwig0adba532007-08-30 17:21:46 +10001803 xlog_tic_add_region(ticket, reg[index].i_len, reg[index].i_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 }
1805 contwr = *start_lsn = 0;
1806
1807 if (ticket->t_curr_res < len) {
Tim Shimmin7e9c6392005-09-02 16:42:05 +10001808 xlog_print_tic_res(mp, ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809#ifdef DEBUG
1810 xlog_panic(
1811 "xfs_log_write: reservation ran out. Need to up reservation");
1812#else
1813 /* Customer configurable panic */
1814 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp,
1815 "xfs_log_write: reservation ran out. Need to up reservation");
1816 /* If we did not panic, shutdown the filesystem */
Nathan Scott7d04a332006-06-09 14:58:38 +10001817 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818#endif
1819 } else
1820 ticket->t_curr_res -= len;
1821
1822 for (index = 0; index < nentries; ) {
1823 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket,
1824 &contwr, &log_offset)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001825 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826
1827 ASSERT(log_offset <= iclog->ic_size - 1);
1828 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset);
1829
1830 /* start_lsn is the first lsn written to. That's all we need. */
1831 if (! *start_lsn)
Christoph Hellwigb53e6752007-10-12 10:59:34 +10001832 *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833
1834 /* This loop writes out as many regions as can fit in the amount
1835 * of space which was allocated by xlog_state_get_iclog_space().
1836 */
1837 while (index < nentries) {
1838 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0);
1839 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0);
1840 start_rec_copy = 0;
1841
1842 /* If first write for transaction, insert start record.
1843 * We can't be trying to commit if we are inited. We can't
1844 * have any "partial_copy" if we are inited.
1845 */
1846 if (ticket->t_flags & XLOG_TIC_INITED) {
1847 logop_head = (xlog_op_header_t *)ptr;
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10001848 logop_head->oh_tid = cpu_to_be32(ticket->t_tid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 logop_head->oh_clientid = ticket->t_clientid;
1850 logop_head->oh_len = 0;
1851 logop_head->oh_flags = XLOG_START_TRANS;
1852 logop_head->oh_res2 = 0;
1853 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */
1854 record_cnt++;
1855
1856 start_rec_copy = sizeof(xlog_op_header_t);
1857 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy);
1858 }
1859
1860 /* Copy log operation header directly into data section */
1861 logop_head = (xlog_op_header_t *)ptr;
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10001862 logop_head->oh_tid = cpu_to_be32(ticket->t_tid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 logop_head->oh_clientid = ticket->t_clientid;
1864 logop_head->oh_res2 = 0;
1865
1866 /* header copied directly */
1867 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t));
1868
1869 /* are we copying a commit or unmount record? */
1870 logop_head->oh_flags = flags;
1871
1872 /*
1873 * We've seen logs corrupted with bad transaction client
1874 * ids. This makes sure that XFS doesn't generate them on.
1875 * Turn this into an EIO and shut down the filesystem.
1876 */
1877 switch (logop_head->oh_clientid) {
1878 case XFS_TRANSACTION:
1879 case XFS_VOLUME:
1880 case XFS_LOG:
1881 break;
1882 default:
1883 xfs_fs_cmn_err(CE_WARN, mp,
1884 "Bad XFS transaction clientid 0x%x in ticket 0x%p",
1885 logop_head->oh_clientid, tic);
1886 return XFS_ERROR(EIO);
1887 }
1888
1889 /* Partial write last time? => (partial_copy != 0)
1890 * need_copy is the amount we'd like to copy if everything could
1891 * fit in the current memcpy.
1892 */
1893 need_copy = reg[index].i_len - partial_copy_len;
1894
1895 copy_off = partial_copy_len;
1896 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10001897 copy_len = need_copy;
1898 logop_head->oh_len = cpu_to_be32(copy_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 if (partial_copy)
1900 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS);
1901 partial_copy_len = partial_copy = 0;
1902 } else { /* partial write */
1903 copy_len = iclog->ic_size - log_offset;
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10001904 logop_head->oh_len = cpu_to_be32(copy_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 logop_head->oh_flags |= XLOG_CONTINUE_TRANS;
1906 if (partial_copy)
1907 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS;
1908 partial_copy_len += copy_len;
1909 partial_copy++;
1910 len += sizeof(xlog_op_header_t); /* from splitting of region */
1911 /* account for new log op header */
1912 ticket->t_curr_res -= sizeof(xlog_op_header_t);
Christoph Hellwig0adba532007-08-30 17:21:46 +10001913 ticket->t_res_num_ophdrs++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 }
1915 xlog_verify_dest_ptr(log, ptr);
1916
1917 /* copy region */
1918 ASSERT(copy_len >= 0);
1919 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len);
1920 xlog_write_adv_cnt(ptr, len, log_offset, copy_len);
1921
1922 /* make copy_len total bytes copied, including headers */
1923 copy_len += start_rec_copy + sizeof(xlog_op_header_t);
1924 record_cnt++;
1925 data_cnt += contwr ? copy_len : 0;
1926 if (partial_copy) { /* copied partial region */
1927 /* already marked WANT_SYNC by xlog_state_get_iclog_space */
1928 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1929 record_cnt = data_cnt = 0;
1930 if ((error = xlog_state_release_iclog(log, iclog)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001931 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 break; /* don't increment index */
1933 } else { /* copied entire region */
1934 index++;
1935 partial_copy_len = partial_copy = 0;
1936
1937 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) {
1938 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1939 record_cnt = data_cnt = 0;
1940 xlog_state_want_sync(log, iclog);
1941 if (commit_iclog) {
1942 ASSERT(flags & XLOG_COMMIT_TRANS);
1943 *commit_iclog = iclog;
1944 } else if ((error = xlog_state_release_iclog(log, iclog)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001945 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 if (index == nentries)
1947 return 0; /* we are done */
1948 else
1949 break;
1950 }
1951 } /* if (partial_copy) */
1952 } /* while (index < nentries) */
1953 } /* for (index = 0; index < nentries; ) */
1954 ASSERT(len == 0);
1955
1956 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1957 if (commit_iclog) {
1958 ASSERT(flags & XLOG_COMMIT_TRANS);
1959 *commit_iclog = iclog;
1960 return 0;
1961 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001962 return xlog_state_release_iclog(log, iclog);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963} /* xlog_write */
1964
1965
1966/*****************************************************************************
1967 *
1968 * State Machine functions
1969 *
1970 *****************************************************************************
1971 */
1972
1973/* Clean iclogs starting from the head. This ordering must be
1974 * maintained, so an iclog doesn't become ACTIVE beyond one that
1975 * is SYNCING. This is also required to maintain the notion that we use
1976 * a counting semaphore to hold off would be writers to the log when every
1977 * iclog is trying to sync to disk.
1978 *
1979 * State Change: DIRTY -> ACTIVE
1980 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001981STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982xlog_state_clean_log(xlog_t *log)
1983{
1984 xlog_in_core_t *iclog;
1985 int changed = 0;
1986
1987 iclog = log->l_iclog;
1988 do {
1989 if (iclog->ic_state == XLOG_STATE_DIRTY) {
1990 iclog->ic_state = XLOG_STATE_ACTIVE;
1991 iclog->ic_offset = 0;
David Chinner114d23a2008-04-10 12:18:39 +10001992 ASSERT(iclog->ic_callback == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993 /*
1994 * If the number of ops in this iclog indicate it just
1995 * contains the dummy transaction, we can
1996 * change state into IDLE (the second time around).
1997 * Otherwise we should change the state into
1998 * NEED a dummy.
1999 * We don't need to cover the dummy.
2000 */
2001 if (!changed &&
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002002 (be32_to_cpu(iclog->ic_header.h_num_logops) ==
2003 XLOG_COVER_OPS)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 changed = 1;
2005 } else {
2006 /*
2007 * We have two dirty iclogs so start over
2008 * This could also be num of ops indicates
2009 * this is not the dummy going out.
2010 */
2011 changed = 2;
2012 }
2013 iclog->ic_header.h_num_logops = 0;
2014 memset(iclog->ic_header.h_cycle_data, 0,
2015 sizeof(iclog->ic_header.h_cycle_data));
2016 iclog->ic_header.h_lsn = 0;
2017 } else if (iclog->ic_state == XLOG_STATE_ACTIVE)
2018 /* do nothing */;
2019 else
2020 break; /* stop cleaning */
2021 iclog = iclog->ic_next;
2022 } while (iclog != log->l_iclog);
2023
2024 /* log is locked when we are called */
2025 /*
2026 * Change state for the dummy log recording.
2027 * We usually go to NEED. But we go to NEED2 if the changed indicates
2028 * we are done writing the dummy record.
2029 * If we are done with the second dummy recored (DONE2), then
2030 * we go to IDLE.
2031 */
2032 if (changed) {
2033 switch (log->l_covered_state) {
2034 case XLOG_STATE_COVER_IDLE:
2035 case XLOG_STATE_COVER_NEED:
2036 case XLOG_STATE_COVER_NEED2:
2037 log->l_covered_state = XLOG_STATE_COVER_NEED;
2038 break;
2039
2040 case XLOG_STATE_COVER_DONE:
2041 if (changed == 1)
2042 log->l_covered_state = XLOG_STATE_COVER_NEED2;
2043 else
2044 log->l_covered_state = XLOG_STATE_COVER_NEED;
2045 break;
2046
2047 case XLOG_STATE_COVER_DONE2:
2048 if (changed == 1)
2049 log->l_covered_state = XLOG_STATE_COVER_IDLE;
2050 else
2051 log->l_covered_state = XLOG_STATE_COVER_NEED;
2052 break;
2053
2054 default:
2055 ASSERT(0);
2056 }
2057 }
2058} /* xlog_state_clean_log */
2059
2060STATIC xfs_lsn_t
2061xlog_get_lowest_lsn(
2062 xlog_t *log)
2063{
2064 xlog_in_core_t *lsn_log;
2065 xfs_lsn_t lowest_lsn, lsn;
2066
2067 lsn_log = log->l_iclog;
2068 lowest_lsn = 0;
2069 do {
2070 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002071 lsn = be64_to_cpu(lsn_log->ic_header.h_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072 if ((lsn && !lowest_lsn) ||
2073 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) {
2074 lowest_lsn = lsn;
2075 }
2076 }
2077 lsn_log = lsn_log->ic_next;
2078 } while (lsn_log != log->l_iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01002079 return lowest_lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080}
2081
2082
2083STATIC void
2084xlog_state_do_callback(
2085 xlog_t *log,
2086 int aborted,
2087 xlog_in_core_t *ciclog)
2088{
2089 xlog_in_core_t *iclog;
2090 xlog_in_core_t *first_iclog; /* used to know when we've
2091 * processed all iclogs once */
2092 xfs_log_callback_t *cb, *cb_next;
2093 int flushcnt = 0;
2094 xfs_lsn_t lowest_lsn;
2095 int ioerrors; /* counter: iclogs with errors */
2096 int loopdidcallbacks; /* flag: inner loop did callbacks*/
2097 int funcdidcallbacks; /* flag: function did callbacks */
2098 int repeats; /* for issuing console warnings if
2099 * looping too many times */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002101 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 first_iclog = iclog = log->l_iclog;
2103 ioerrors = 0;
2104 funcdidcallbacks = 0;
2105 repeats = 0;
2106
2107 do {
2108 /*
2109 * Scan all iclogs starting with the one pointed to by the
2110 * log. Reset this starting point each time the log is
2111 * unlocked (during callbacks).
2112 *
2113 * Keep looping through iclogs until one full pass is made
2114 * without running any callbacks.
2115 */
2116 first_iclog = log->l_iclog;
2117 iclog = log->l_iclog;
2118 loopdidcallbacks = 0;
2119 repeats++;
2120
2121 do {
2122
2123 /* skip all iclogs in the ACTIVE & DIRTY states */
2124 if (iclog->ic_state &
2125 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) {
2126 iclog = iclog->ic_next;
2127 continue;
2128 }
2129
2130 /*
2131 * Between marking a filesystem SHUTDOWN and stopping
2132 * the log, we do flush all iclogs to disk (if there
2133 * wasn't a log I/O error). So, we do want things to
2134 * go smoothly in case of just a SHUTDOWN w/o a
2135 * LOG_IO_ERROR.
2136 */
2137 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
2138 /*
2139 * Can only perform callbacks in order. Since
2140 * this iclog is not in the DONE_SYNC/
2141 * DO_CALLBACK state, we skip the rest and
2142 * just try to clean up. If we set our iclog
2143 * to DO_CALLBACK, we will not process it when
2144 * we retry since a previous iclog is in the
2145 * CALLBACK and the state cannot change since
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002146 * we are holding the l_icloglock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 */
2148 if (!(iclog->ic_state &
2149 (XLOG_STATE_DONE_SYNC |
2150 XLOG_STATE_DO_CALLBACK))) {
2151 if (ciclog && (ciclog->ic_state ==
2152 XLOG_STATE_DONE_SYNC)) {
2153 ciclog->ic_state = XLOG_STATE_DO_CALLBACK;
2154 }
2155 break;
2156 }
2157 /*
2158 * We now have an iclog that is in either the
2159 * DO_CALLBACK or DONE_SYNC states. The other
2160 * states (WANT_SYNC, SYNCING, or CALLBACK were
2161 * caught by the above if and are going to
2162 * clean (i.e. we aren't doing their callbacks)
2163 * see the above if.
2164 */
2165
2166 /*
2167 * We will do one more check here to see if we
2168 * have chased our tail around.
2169 */
2170
2171 lowest_lsn = xlog_get_lowest_lsn(log);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002172 if (lowest_lsn &&
2173 XFS_LSN_CMP(lowest_lsn,
2174 be64_to_cpu(iclog->ic_header.h_lsn)) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 iclog = iclog->ic_next;
2176 continue; /* Leave this iclog for
2177 * another thread */
2178 }
2179
2180 iclog->ic_state = XLOG_STATE_CALLBACK;
2181
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002182 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183
2184 /* l_last_sync_lsn field protected by
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002185 * l_grant_lock. Don't worry about iclog's lsn.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 * No one else can be here except us.
2187 */
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002188 spin_lock(&log->l_grant_lock);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002189 ASSERT(XFS_LSN_CMP(log->l_last_sync_lsn,
2190 be64_to_cpu(iclog->ic_header.h_lsn)) <= 0);
2191 log->l_last_sync_lsn =
2192 be64_to_cpu(iclog->ic_header.h_lsn);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002193 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194
Linus Torvalds1da177e2005-04-16 15:20:36 -07002195 } else {
David Chinner114d23a2008-04-10 12:18:39 +10002196 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197 ioerrors++;
2198 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199
David Chinner114d23a2008-04-10 12:18:39 +10002200 /*
2201 * Keep processing entries in the callback list until
2202 * we come around and it is empty. We need to
2203 * atomically see that the list is empty and change the
2204 * state to DIRTY so that we don't miss any more
2205 * callbacks being added.
2206 */
2207 spin_lock(&iclog->ic_callback_lock);
2208 cb = iclog->ic_callback;
Christoph Hellwig4b809162007-08-16 15:37:36 +10002209 while (cb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210 iclog->ic_callback_tail = &(iclog->ic_callback);
2211 iclog->ic_callback = NULL;
David Chinner114d23a2008-04-10 12:18:39 +10002212 spin_unlock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213
2214 /* perform callbacks in the order given */
Christoph Hellwig4b809162007-08-16 15:37:36 +10002215 for (; cb; cb = cb_next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216 cb_next = cb->cb_next;
2217 cb->cb_func(cb->cb_arg, aborted);
2218 }
David Chinner114d23a2008-04-10 12:18:39 +10002219 spin_lock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220 cb = iclog->ic_callback;
2221 }
2222
2223 loopdidcallbacks++;
2224 funcdidcallbacks++;
2225
David Chinner114d23a2008-04-10 12:18:39 +10002226 spin_lock(&log->l_icloglock);
Christoph Hellwig4b809162007-08-16 15:37:36 +10002227 ASSERT(iclog->ic_callback == NULL);
David Chinner114d23a2008-04-10 12:18:39 +10002228 spin_unlock(&iclog->ic_callback_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 if (!(iclog->ic_state & XLOG_STATE_IOERROR))
2230 iclog->ic_state = XLOG_STATE_DIRTY;
2231
2232 /*
2233 * Transition from DIRTY to ACTIVE if applicable.
2234 * NOP if STATE_IOERROR.
2235 */
2236 xlog_state_clean_log(log);
2237
2238 /* wake up threads waiting in xfs_log_force() */
2239 sv_broadcast(&iclog->ic_forcesema);
2240
2241 iclog = iclog->ic_next;
2242 } while (first_iclog != iclog);
Nathan Scotta3c6685e2006-09-28 11:02:14 +10002243
2244 if (repeats > 5000) {
2245 flushcnt += repeats;
2246 repeats = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247 xfs_fs_cmn_err(CE_WARN, log->l_mp,
Nathan Scotta3c6685e2006-09-28 11:02:14 +10002248 "%s: possible infinite loop (%d iterations)",
Harvey Harrison34a622b2008-04-10 12:19:21 +10002249 __func__, flushcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 }
2251 } while (!ioerrors && loopdidcallbacks);
2252
2253 /*
2254 * make one last gasp attempt to see if iclogs are being left in
2255 * limbo..
2256 */
2257#ifdef DEBUG
2258 if (funcdidcallbacks) {
2259 first_iclog = iclog = log->l_iclog;
2260 do {
2261 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK);
2262 /*
2263 * Terminate the loop if iclogs are found in states
2264 * which will cause other threads to clean up iclogs.
2265 *
2266 * SYNCING - i/o completion will go through logs
2267 * DONE_SYNC - interrupt thread should be waiting for
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002268 * l_icloglock
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 * IOERROR - give up hope all ye who enter here
2270 */
2271 if (iclog->ic_state == XLOG_STATE_WANT_SYNC ||
2272 iclog->ic_state == XLOG_STATE_SYNCING ||
2273 iclog->ic_state == XLOG_STATE_DONE_SYNC ||
2274 iclog->ic_state == XLOG_STATE_IOERROR )
2275 break;
2276 iclog = iclog->ic_next;
2277 } while (first_iclog != iclog);
2278 }
2279#endif
2280
Nathan Scotta3c6685e2006-09-28 11:02:14 +10002281 flushcnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) {
2283 flushcnt = log->l_flushcnt;
2284 log->l_flushcnt = 0;
2285 }
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002286 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 while (flushcnt--)
2288 vsema(&log->l_flushsema);
2289} /* xlog_state_do_callback */
2290
2291
2292/*
2293 * Finish transitioning this iclog to the dirty state.
2294 *
2295 * Make sure that we completely execute this routine only when this is
2296 * the last call to the iclog. There is a good chance that iclog flushes,
2297 * when we reach the end of the physical log, get turned into 2 separate
2298 * calls to bwrite. Hence, one iclog flush could generate two calls to this
2299 * routine. By using the reference count bwritecnt, we guarantee that only
2300 * the second completion goes through.
2301 *
2302 * Callbacks could take time, so they are done outside the scope of the
2303 * global state machine log lock. Assume that the calls to cvsema won't
2304 * take a long time. At least we know it won't sleep.
2305 */
David Chinnera8272ce2007-11-23 16:28:09 +11002306STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307xlog_state_done_syncing(
2308 xlog_in_core_t *iclog,
2309 int aborted)
2310{
2311 xlog_t *log = iclog->ic_log;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002313 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314
2315 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING ||
2316 iclog->ic_state == XLOG_STATE_IOERROR);
David Chinner155cc6b2008-03-06 13:44:14 +11002317 ASSERT(atomic_read(&iclog->ic_refcnt) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2);
2319
2320
2321 /*
2322 * If we got an error, either on the first buffer, or in the case of
2323 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR,
2324 * and none should ever be attempted to be written to disk
2325 * again.
2326 */
2327 if (iclog->ic_state != XLOG_STATE_IOERROR) {
2328 if (--iclog->ic_bwritecnt == 1) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002329 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 return;
2331 }
2332 iclog->ic_state = XLOG_STATE_DONE_SYNC;
2333 }
2334
2335 /*
2336 * Someone could be sleeping prior to writing out the next
2337 * iclog buffer, we wake them all, one will get to do the
2338 * I/O, the others get to wait for the result.
2339 */
2340 sv_broadcast(&iclog->ic_writesema);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002341 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */
2343} /* xlog_state_done_syncing */
2344
2345
2346/*
2347 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must
2348 * sleep. The flush semaphore is set to the number of in-core buffers and
2349 * decremented around disk syncing. Therefore, if all buffers are syncing,
2350 * this semaphore will cause new writes to sleep until a sync completes.
2351 * Otherwise, this code just does p() followed by v(). This approximates
2352 * a sleep/wakeup except we can't race.
2353 *
2354 * The in-core logs are used in a circular fashion. They are not used
2355 * out-of-order even when an iclog past the head is free.
2356 *
2357 * return:
2358 * * log_offset where xlog_write() can start writing into the in-core
2359 * log's data space.
2360 * * in-core log pointer to which xlog_write() should write.
2361 * * boolean indicating this is a continued write to an in-core log.
2362 * If this is the last write, then the in-core log's offset field
2363 * needs to be incremented, depending on the amount of data which
2364 * is copied.
2365 */
David Chinnera8272ce2007-11-23 16:28:09 +11002366STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367xlog_state_get_iclog_space(xlog_t *log,
2368 int len,
2369 xlog_in_core_t **iclogp,
2370 xlog_ticket_t *ticket,
2371 int *continued_write,
2372 int *logoffsetp)
2373{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374 int log_offset;
2375 xlog_rec_header_t *head;
2376 xlog_in_core_t *iclog;
2377 int error;
2378
2379restart:
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002380 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002381 if (XLOG_FORCED_SHUTDOWN(log)) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002382 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002383 return XFS_ERROR(EIO);
2384 }
2385
2386 iclog = log->l_iclog;
2387 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) {
2388 log->l_flushcnt++;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002389 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH);
2391 XFS_STATS_INC(xs_log_noiclogs);
2392 /* Ensure that log writes happen */
2393 psema(&log->l_flushsema, PINOD);
2394 goto restart;
2395 }
2396 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
2397 head = &iclog->ic_header;
2398
David Chinner155cc6b2008-03-06 13:44:14 +11002399 atomic_inc(&iclog->ic_refcnt); /* prevents sync */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400 log_offset = iclog->ic_offset;
2401
2402 /* On the 1st write to an iclog, figure out lsn. This works
2403 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
2404 * committing to. If the offset is set, that's how many blocks
2405 * must be written.
2406 */
2407 if (log_offset == 0) {
2408 ticket->t_curr_res -= log->l_iclog_hsize;
Christoph Hellwig0adba532007-08-30 17:21:46 +10002409 xlog_tic_add_region(ticket,
Tim Shimmin7e9c6392005-09-02 16:42:05 +10002410 log->l_iclog_hsize,
2411 XLOG_REG_TYPE_LRHEADER);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002412 head->h_cycle = cpu_to_be32(log->l_curr_cycle);
2413 head->h_lsn = cpu_to_be64(
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10002414 xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002415 ASSERT(log->l_curr_block >= 0);
2416 }
2417
2418 /* If there is enough room to write everything, then do it. Otherwise,
2419 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC
2420 * bit is on, so this will get flushed out. Don't update ic_offset
2421 * until you know exactly how many bytes get copied. Therefore, wait
2422 * until later to update ic_offset.
2423 *
2424 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's
2425 * can fit into remaining data section.
2426 */
2427 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) {
2428 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2429
Dave Chinner49641f12008-07-11 17:43:55 +10002430 /*
2431 * If I'm the only one writing to this iclog, sync it to disk.
2432 * We need to do an atomic compare and decrement here to avoid
2433 * racing with concurrent atomic_dec_and_lock() calls in
2434 * xlog_state_release_iclog() when there is more than one
2435 * reference to the iclog.
2436 */
2437 if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) {
2438 /* we are the only one */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002439 spin_unlock(&log->l_icloglock);
Dave Chinner49641f12008-07-11 17:43:55 +10002440 error = xlog_state_release_iclog(log, iclog);
2441 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +01002442 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443 } else {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002444 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445 }
2446 goto restart;
2447 }
2448
2449 /* Do we have enough room to write the full amount in the remainder
2450 * of this iclog? Or must we continue a write on the next iclog and
2451 * mark this iclog as completely taken? In the case where we switch
2452 * iclogs (to mark it taken), this particular iclog will release/sync
2453 * to disk in xlog_write().
2454 */
2455 if (len <= iclog->ic_size - iclog->ic_offset) {
2456 *continued_write = 0;
2457 iclog->ic_offset += len;
2458 } else {
2459 *continued_write = 1;
2460 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2461 }
2462 *iclogp = iclog;
2463
2464 ASSERT(iclog->ic_offset <= iclog->ic_size);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002465 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466
2467 *logoffsetp = log_offset;
2468 return 0;
2469} /* xlog_state_get_iclog_space */
2470
2471/*
2472 * Atomically get the log space required for a log ticket.
2473 *
2474 * Once a ticket gets put onto the reserveq, it will only return after
2475 * the needed reservation is satisfied.
2476 */
2477STATIC int
2478xlog_grant_log_space(xlog_t *log,
2479 xlog_ticket_t *tic)
2480{
2481 int free_bytes;
2482 int need_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483#ifdef DEBUG
2484 xfs_lsn_t tail_lsn;
2485#endif
2486
2487
2488#ifdef DEBUG
2489 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
2490 panic("grant Recovery problem");
2491#endif
2492
2493 /* Is there space or do we need to sleep? */
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002494 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter");
2496
2497 /* something is already sleeping; insert new transaction at end */
2498 if (log->l_reserve_headq) {
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002499 xlog_ins_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500 xlog_trace_loggrant(log, tic,
2501 "xlog_grant_log_space: sleep 1");
2502 /*
2503 * Gotta check this before going to sleep, while we're
2504 * holding the grant lock.
2505 */
2506 if (XLOG_FORCED_SHUTDOWN(log))
2507 goto error_return;
2508
2509 XFS_STATS_INC(xs_sleep_logspace);
2510 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2511 /*
2512 * If we got an error, and the filesystem is shutting down,
2513 * we'll catch it down below. So just continue...
2514 */
2515 xlog_trace_loggrant(log, tic,
2516 "xlog_grant_log_space: wake 1");
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002517 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 }
2519 if (tic->t_flags & XFS_LOG_PERM_RESERV)
2520 need_bytes = tic->t_unit_res*tic->t_ocnt;
2521 else
2522 need_bytes = tic->t_unit_res;
2523
2524redo:
2525 if (XLOG_FORCED_SHUTDOWN(log))
2526 goto error_return;
2527
2528 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle,
2529 log->l_grant_reserve_bytes);
2530 if (free_bytes < need_bytes) {
2531 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002532 xlog_ins_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002533 xlog_trace_loggrant(log, tic,
2534 "xlog_grant_log_space: sleep 2");
2535 XFS_STATS_INC(xs_sleep_logspace);
2536 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2537
2538 if (XLOG_FORCED_SHUTDOWN(log)) {
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002539 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002540 goto error_return;
2541 }
2542
2543 xlog_trace_loggrant(log, tic,
2544 "xlog_grant_log_space: wake 2");
2545 xlog_grant_push_ail(log->l_mp, need_bytes);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002546 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547 goto redo;
2548 } else if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002549 xlog_del_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002550
2551 /* we've got enough space */
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002552 xlog_grant_add_space(log, need_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002553#ifdef DEBUG
2554 tail_lsn = log->l_tail_lsn;
2555 /*
2556 * Check to make sure the grant write head didn't just over lap the
2557 * tail. If the cycles are the same, we can't be overlapping.
2558 * Otherwise, make sure that the cycles differ by exactly one and
2559 * check the byte count.
2560 */
2561 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {
2562 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));
2563 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));
2564 }
2565#endif
2566 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit");
2567 xlog_verify_grant_head(log, 1);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002568 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 return 0;
2570
2571 error_return:
2572 if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002573 xlog_del_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002574 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret");
2575 /*
2576 * If we are failing, make sure the ticket doesn't have any
2577 * current reservations. We don't want to add this back when
2578 * the ticket/transaction gets cancelled.
2579 */
2580 tic->t_curr_res = 0;
2581 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002582 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583 return XFS_ERROR(EIO);
2584} /* xlog_grant_log_space */
2585
2586
2587/*
2588 * Replenish the byte reservation required by moving the grant write head.
2589 *
2590 *
2591 */
2592STATIC int
2593xlog_regrant_write_log_space(xlog_t *log,
2594 xlog_ticket_t *tic)
2595{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002596 int free_bytes, need_bytes;
2597 xlog_ticket_t *ntic;
2598#ifdef DEBUG
2599 xfs_lsn_t tail_lsn;
2600#endif
2601
2602 tic->t_curr_res = tic->t_unit_res;
Christoph Hellwig0adba532007-08-30 17:21:46 +10002603 xlog_tic_reset_res(tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604
2605 if (tic->t_cnt > 0)
Jesper Juhl014c2542006-01-15 02:37:08 +01002606 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607
2608#ifdef DEBUG
2609 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
2610 panic("regrant Recovery problem");
2611#endif
2612
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002613 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002614 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter");
2615
2616 if (XLOG_FORCED_SHUTDOWN(log))
2617 goto error_return;
2618
2619 /* If there are other waiters on the queue then give them a
2620 * chance at logspace before us. Wake up the first waiters,
2621 * if we do not wake up all the waiters then go to sleep waiting
2622 * for more free space, otherwise try to get some space for
2623 * this transaction.
2624 */
2625
2626 if ((ntic = log->l_write_headq)) {
2627 free_bytes = xlog_space_left(log, log->l_grant_write_cycle,
2628 log->l_grant_write_bytes);
2629 do {
2630 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV);
2631
2632 if (free_bytes < ntic->t_unit_res)
2633 break;
2634 free_bytes -= ntic->t_unit_res;
2635 sv_signal(&ntic->t_sema);
2636 ntic = ntic->t_next;
2637 } while (ntic != log->l_write_headq);
2638
2639 if (ntic != log->l_write_headq) {
2640 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002641 xlog_ins_ticketq(&log->l_write_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642
2643 xlog_trace_loggrant(log, tic,
2644 "xlog_regrant_write_log_space: sleep 1");
2645 XFS_STATS_INC(xs_sleep_logspace);
2646 sv_wait(&tic->t_sema, PINOD|PLTWAIT,
2647 &log->l_grant_lock, s);
2648
2649 /* If we're shutting down, this tic is already
2650 * off the queue */
2651 if (XLOG_FORCED_SHUTDOWN(log)) {
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002652 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653 goto error_return;
2654 }
2655
2656 xlog_trace_loggrant(log, tic,
2657 "xlog_regrant_write_log_space: wake 1");
2658 xlog_grant_push_ail(log->l_mp, tic->t_unit_res);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002659 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 }
2661 }
2662
2663 need_bytes = tic->t_unit_res;
2664
2665redo:
2666 if (XLOG_FORCED_SHUTDOWN(log))
2667 goto error_return;
2668
2669 free_bytes = xlog_space_left(log, log->l_grant_write_cycle,
2670 log->l_grant_write_bytes);
2671 if (free_bytes < need_bytes) {
2672 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002673 xlog_ins_ticketq(&log->l_write_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 XFS_STATS_INC(xs_sleep_logspace);
2675 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2676
2677 /* If we're shutting down, this tic is already off the queue */
2678 if (XLOG_FORCED_SHUTDOWN(log)) {
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002679 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002680 goto error_return;
2681 }
2682
2683 xlog_trace_loggrant(log, tic,
2684 "xlog_regrant_write_log_space: wake 2");
2685 xlog_grant_push_ail(log->l_mp, need_bytes);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002686 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687 goto redo;
2688 } else if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002689 xlog_del_ticketq(&log->l_write_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002691 /* we've got enough space */
2692 xlog_grant_add_space_write(log, need_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693#ifdef DEBUG
2694 tail_lsn = log->l_tail_lsn;
2695 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {
2696 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));
2697 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));
2698 }
2699#endif
2700
2701 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit");
2702 xlog_verify_grant_head(log, 1);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002703 spin_unlock(&log->l_grant_lock);
Jesper Juhl014c2542006-01-15 02:37:08 +01002704 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705
2706
2707 error_return:
2708 if (tic->t_flags & XLOG_TIC_IN_Q)
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002709 xlog_del_ticketq(&log->l_reserve_headq, tic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret");
2711 /*
2712 * If we are failing, make sure the ticket doesn't have any
2713 * current reservations. We don't want to add this back when
2714 * the ticket/transaction gets cancelled.
2715 */
2716 tic->t_curr_res = 0;
2717 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002718 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719 return XFS_ERROR(EIO);
2720} /* xlog_regrant_write_log_space */
2721
2722
2723/* The first cnt-1 times through here we don't need to
2724 * move the grant write head because the permanent
2725 * reservation has reserved cnt times the unit amount.
2726 * Release part of current permanent unit reservation and
2727 * reset current reservation to be one units worth. Also
2728 * move grant reservation head forward.
2729 */
2730STATIC void
2731xlog_regrant_reserve_log_space(xlog_t *log,
2732 xlog_ticket_t *ticket)
2733{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002734 xlog_trace_loggrant(log, ticket,
2735 "xlog_regrant_reserve_log_space: enter");
2736 if (ticket->t_cnt > 0)
2737 ticket->t_cnt--;
2738
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002739 spin_lock(&log->l_grant_lock);
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002740 xlog_grant_sub_space(log, ticket->t_curr_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741 ticket->t_curr_res = ticket->t_unit_res;
Christoph Hellwig0adba532007-08-30 17:21:46 +10002742 xlog_tic_reset_res(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743 xlog_trace_loggrant(log, ticket,
2744 "xlog_regrant_reserve_log_space: sub current res");
2745 xlog_verify_grant_head(log, 1);
2746
2747 /* just return if we still have some of the pre-reserved space */
2748 if (ticket->t_cnt > 0) {
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002749 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002750 return;
2751 }
2752
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002753 xlog_grant_add_space_reserve(log, ticket->t_unit_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002754 xlog_trace_loggrant(log, ticket,
2755 "xlog_regrant_reserve_log_space: exit");
2756 xlog_verify_grant_head(log, 0);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002757 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 ticket->t_curr_res = ticket->t_unit_res;
Christoph Hellwig0adba532007-08-30 17:21:46 +10002759 xlog_tic_reset_res(ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760} /* xlog_regrant_reserve_log_space */
2761
2762
2763/*
2764 * Give back the space left from a reservation.
2765 *
2766 * All the information we need to make a correct determination of space left
2767 * is present. For non-permanent reservations, things are quite easy. The
2768 * count should have been decremented to zero. We only need to deal with the
2769 * space remaining in the current reservation part of the ticket. If the
2770 * ticket contains a permanent reservation, there may be left over space which
2771 * needs to be released. A count of N means that N-1 refills of the current
2772 * reservation can be done before we need to ask for more space. The first
2773 * one goes to fill up the first current reservation. Once we run out of
2774 * space, the count will stay at zero and the only space remaining will be
2775 * in the current reservation field.
2776 */
2777STATIC void
2778xlog_ungrant_log_space(xlog_t *log,
2779 xlog_ticket_t *ticket)
2780{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002781 if (ticket->t_cnt > 0)
2782 ticket->t_cnt--;
2783
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002784 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter");
2786
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002787 xlog_grant_sub_space(log, ticket->t_curr_res);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002788
2789 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current");
2790
2791 /* If this is a permanent reservation ticket, we may be able to free
2792 * up more space based on the remaining count.
2793 */
2794 if (ticket->t_cnt > 0) {
2795 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV);
Christoph Hellwigdd954c62006-01-11 15:34:50 +11002796 xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797 }
2798
2799 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit");
2800 xlog_verify_grant_head(log, 1);
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10002801 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002802 xfs_log_move_tail(log->l_mp, 1);
2803} /* xlog_ungrant_log_space */
2804
2805
2806/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002807 * Flush iclog to disk if this is the last reference to the given iclog and
2808 * the WANT_SYNC bit is set.
2809 *
2810 * When this function is entered, the iclog is not necessarily in the
2811 * WANT_SYNC state. It may be sitting around waiting to get filled.
2812 *
2813 *
2814 */
David Chinnera8272ce2007-11-23 16:28:09 +11002815STATIC int
David Chinnerb5893342008-03-06 13:44:06 +11002816xlog_state_release_iclog(
2817 xlog_t *log,
2818 xlog_in_core_t *iclog)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002819{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002820 int sync = 0; /* do we sync? */
2821
David Chinner155cc6b2008-03-06 13:44:14 +11002822 if (iclog->ic_state & XLOG_STATE_IOERROR)
2823 return XFS_ERROR(EIO);
2824
2825 ASSERT(atomic_read(&iclog->ic_refcnt) > 0);
2826 if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock))
2827 return 0;
2828
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002830 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002831 return XFS_ERROR(EIO);
2832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002833 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE ||
2834 iclog->ic_state == XLOG_STATE_WANT_SYNC);
2835
David Chinner155cc6b2008-03-06 13:44:14 +11002836 if (iclog->ic_state == XLOG_STATE_WANT_SYNC) {
David Chinnerb5893342008-03-06 13:44:06 +11002837 /* update tail before writing to iclog */
2838 xlog_assign_tail_lsn(log->l_mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839 sync++;
2840 iclog->ic_state = XLOG_STATE_SYNCING;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002841 iclog->ic_header.h_tail_lsn = cpu_to_be64(log->l_tail_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn);
2843 /* cycle incremented when incrementing curr_block */
2844 }
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002845 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846
2847 /*
2848 * We let the log lock go, so it's possible that we hit a log I/O
Nathan Scottc41564b2006-03-29 08:55:14 +10002849 * error or some other SHUTDOWN condition that marks the iclog
Linus Torvalds1da177e2005-04-16 15:20:36 -07002850 * as XLOG_STATE_IOERROR before the bwrite. However, we know that
2851 * this iclog has consistent data, so we ignore IOERROR
2852 * flags after this point.
2853 */
David Chinnerb5893342008-03-06 13:44:06 +11002854 if (sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002855 return xlog_sync(log, iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01002856 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002857} /* xlog_state_release_iclog */
2858
2859
2860/*
2861 * This routine will mark the current iclog in the ring as WANT_SYNC
2862 * and move the current iclog pointer to the next iclog in the ring.
2863 * When this routine is called from xlog_state_get_iclog_space(), the
2864 * exact size of the iclog has not yet been determined. All we know is
2865 * that every data block. We have run out of space in this log record.
2866 */
2867STATIC void
2868xlog_state_switch_iclogs(xlog_t *log,
2869 xlog_in_core_t *iclog,
2870 int eventual_size)
2871{
2872 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
2873 if (!eventual_size)
2874 eventual_size = iclog->ic_offset;
2875 iclog->ic_state = XLOG_STATE_WANT_SYNC;
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002876 iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877 log->l_prev_block = log->l_curr_block;
2878 log->l_prev_cycle = log->l_curr_cycle;
2879
2880 /* roll log?: ic_offset changed later */
2881 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize);
2882
2883 /* Round up to next log-sunit */
Eric Sandeen62118702008-03-06 13:44:28 +11002884 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002885 log->l_mp->m_sb.sb_logsunit > 1) {
2886 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit);
2887 log->l_curr_block = roundup(log->l_curr_block, sunit_bb);
2888 }
2889
2890 if (log->l_curr_block >= log->l_logBBsize) {
2891 log->l_curr_cycle++;
2892 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM)
2893 log->l_curr_cycle++;
2894 log->l_curr_block -= log->l_logBBsize;
2895 ASSERT(log->l_curr_block >= 0);
2896 }
2897 ASSERT(iclog == log->l_iclog);
2898 log->l_iclog = iclog->ic_next;
2899} /* xlog_state_switch_iclogs */
2900
2901
2902/*
2903 * Write out all data in the in-core log as of this exact moment in time.
2904 *
2905 * Data may be written to the in-core log during this call. However,
2906 * we don't guarantee this data will be written out. A change from past
2907 * implementation means this routine will *not* write out zero length LRs.
2908 *
2909 * Basically, we try and perform an intelligent scan of the in-core logs.
2910 * If we determine there is no flushable data, we just return. There is no
2911 * flushable data if:
2912 *
2913 * 1. the current iclog is active and has no data; the previous iclog
2914 * is in the active or dirty state.
2915 * 2. the current iclog is drity, and the previous iclog is in the
2916 * active or dirty state.
2917 *
2918 * We may sleep (call psema) if:
2919 *
2920 * 1. the current iclog is not in the active nor dirty state.
2921 * 2. the current iclog dirty, and the previous iclog is not in the
2922 * active nor dirty state.
2923 * 3. the current iclog is active, and there is another thread writing
2924 * to this particular iclog.
2925 * 4. a) the current iclog is active and has no other writers
2926 * b) when we return from flushing out this iclog, it is still
2927 * not in the active nor dirty state.
2928 */
2929STATIC int
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11002930xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931{
2932 xlog_in_core_t *iclog;
2933 xfs_lsn_t lsn;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002935 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002936
2937 iclog = log->l_iclog;
2938 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002939 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940 return XFS_ERROR(EIO);
2941 }
2942
2943 /* If the head iclog is not active nor dirty, we just attach
2944 * ourselves to the head and go to sleep.
2945 */
2946 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
2947 iclog->ic_state == XLOG_STATE_DIRTY) {
2948 /*
2949 * If the head is dirty or (active and empty), then
2950 * we need to look at the previous iclog. If the previous
2951 * iclog is active or dirty we are done. There is nothing
2952 * to sync out. Otherwise, we attach ourselves to the
2953 * previous iclog and go to sleep.
2954 */
2955 if (iclog->ic_state == XLOG_STATE_DIRTY ||
David Chinner155cc6b2008-03-06 13:44:14 +11002956 (atomic_read(&iclog->ic_refcnt) == 0
2957 && iclog->ic_offset == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002958 iclog = iclog->ic_prev;
2959 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
2960 iclog->ic_state == XLOG_STATE_DIRTY)
2961 goto no_sleep;
2962 else
2963 goto maybe_sleep;
2964 } else {
David Chinner155cc6b2008-03-06 13:44:14 +11002965 if (atomic_read(&iclog->ic_refcnt) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966 /* We are the only one with access to this
2967 * iclog. Flush it out now. There should
2968 * be a roundoff of zero to show that someone
2969 * has already taken care of the roundoff from
2970 * the previous sync.
2971 */
David Chinner155cc6b2008-03-06 13:44:14 +11002972 atomic_inc(&iclog->ic_refcnt);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002973 lsn = be64_to_cpu(iclog->ic_header.h_lsn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974 xlog_state_switch_iclogs(log, iclog, 0);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002975 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002976
2977 if (xlog_state_release_iclog(log, iclog))
2978 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11002979 *log_flushed = 1;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10002980 spin_lock(&log->l_icloglock);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10002981 if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002982 iclog->ic_state != XLOG_STATE_DIRTY)
2983 goto maybe_sleep;
2984 else
2985 goto no_sleep;
2986 } else {
2987 /* Someone else is writing to this iclog.
2988 * Use its call to flush out the data. However,
2989 * the other thread may not force out this LR,
2990 * so we mark it WANT_SYNC.
2991 */
2992 xlog_state_switch_iclogs(log, iclog, 0);
2993 goto maybe_sleep;
2994 }
2995 }
2996 }
2997
2998 /* By the time we come around again, the iclog could've been filled
2999 * which would give it another lsn. If we have a new lsn, just
3000 * return because the relevant data has been flushed.
3001 */
3002maybe_sleep:
3003 if (flags & XFS_LOG_SYNC) {
3004 /*
3005 * We must check if we're shutting down here, before
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003006 * we wait, while we're holding the l_icloglock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007 * Then we check again after waking up, in case our
3008 * sleep was disturbed by a bad news.
3009 */
3010 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003011 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003012 return XFS_ERROR(EIO);
3013 }
3014 XFS_STATS_INC(xs_log_force_sleep);
3015 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s);
3016 /*
3017 * No need to grab the log lock here since we're
3018 * only deciding whether or not to return EIO
3019 * and the memory read should be atomic.
3020 */
3021 if (iclog->ic_state & XLOG_STATE_IOERROR)
3022 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003023 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024
3025 } else {
3026
3027no_sleep:
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003028 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029 }
3030 return 0;
3031} /* xlog_state_sync_all */
3032
3033
3034/*
3035 * Used by code which implements synchronous log forces.
3036 *
3037 * Find in-core log with lsn.
3038 * If it is in the DIRTY state, just return.
3039 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
3040 * state and go to sleep or return.
3041 * If it is in any other state, go to sleep or return.
3042 *
3043 * If filesystem activity goes to zero, the iclog will get flushed only by
3044 * bdflush().
3045 */
David Chinnera8272ce2007-11-23 16:28:09 +11003046STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003047xlog_state_sync(xlog_t *log,
3048 xfs_lsn_t lsn,
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003049 uint flags,
3050 int *log_flushed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003051{
3052 xlog_in_core_t *iclog;
3053 int already_slept = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003054
3055try_again:
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003056 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003057 iclog = log->l_iclog;
3058
3059 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003060 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003061 return XFS_ERROR(EIO);
3062 }
3063
3064 do {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003065 if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) {
3066 iclog = iclog->ic_next;
3067 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068 }
3069
3070 if (iclog->ic_state == XLOG_STATE_DIRTY) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003071 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003072 return 0;
3073 }
3074
3075 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3076 /*
3077 * We sleep here if we haven't already slept (e.g.
3078 * this is the first time we've looked at the correct
3079 * iclog buf) and the buffer before us is going to
3080 * be sync'ed. The reason for this is that if we
3081 * are doing sync transactions here, by waiting for
3082 * the previous I/O to complete, we can allow a few
3083 * more transactions into this iclog before we close
3084 * it down.
3085 *
3086 * Otherwise, we mark the buffer WANT_SYNC, and bump
3087 * up the refcnt so we can release the log (which drops
3088 * the ref count). The state switch keeps new transaction
3089 * commits from using this buffer. When the current commits
3090 * finish writing into the buffer, the refcount will drop to
3091 * zero and the buffer will go out then.
3092 */
3093 if (!already_slept &&
3094 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC |
3095 XLOG_STATE_SYNCING))) {
3096 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR));
3097 XFS_STATS_INC(xs_log_force_sleep);
3098 sv_wait(&iclog->ic_prev->ic_writesema, PSWP,
3099 &log->l_icloglock, s);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003100 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003101 already_slept = 1;
3102 goto try_again;
3103 } else {
David Chinner155cc6b2008-03-06 13:44:14 +11003104 atomic_inc(&iclog->ic_refcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105 xlog_state_switch_iclogs(log, iclog, 0);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003106 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003107 if (xlog_state_release_iclog(log, iclog))
3108 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003109 *log_flushed = 1;
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003110 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003111 }
3112 }
3113
3114 if ((flags & XFS_LOG_SYNC) && /* sleep */
3115 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) {
3116
3117 /*
3118 * Don't wait on the forcesema if we know that we've
3119 * gotten a log write error.
3120 */
3121 if (iclog->ic_state & XLOG_STATE_IOERROR) {
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003122 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123 return XFS_ERROR(EIO);
3124 }
3125 XFS_STATS_INC(xs_log_force_sleep);
3126 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s);
3127 /*
3128 * No need to grab the log lock here since we're
3129 * only deciding whether or not to return EIO
3130 * and the memory read should be atomic.
3131 */
3132 if (iclog->ic_state & XLOG_STATE_IOERROR)
3133 return XFS_ERROR(EIO);
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003134 *log_flushed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003135 } else { /* just return */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003136 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003137 }
3138 return 0;
3139
3140 } while (iclog != log->l_iclog);
3141
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003142 spin_unlock(&log->l_icloglock);
Jesper Juhl014c2542006-01-15 02:37:08 +01003143 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003144} /* xlog_state_sync */
3145
3146
3147/*
3148 * Called when we want to mark the current iclog as being ready to sync to
3149 * disk.
3150 */
David Chinnera8272ce2007-11-23 16:28:09 +11003151STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07003152xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog)
3153{
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003154 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003155
3156 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3157 xlog_state_switch_iclogs(log, iclog, 0);
3158 } else {
3159 ASSERT(iclog->ic_state &
3160 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR));
3161 }
3162
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003163 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003164} /* xlog_state_want_sync */
3165
3166
3167
3168/*****************************************************************************
3169 *
3170 * TICKET functions
3171 *
3172 *****************************************************************************
3173 */
3174
3175/*
David Chinnereb01c9c2008-04-10 12:18:46 +10003176 * Free a used ticket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003177 */
3178STATIC void
3179xlog_ticket_put(xlog_t *log,
3180 xlog_ticket_t *ticket)
3181{
3182 sv_destroy(&ticket->t_sema);
David Chinnereb01c9c2008-04-10 12:18:46 +10003183 kmem_zone_free(xfs_log_ticket_zone, ticket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003184} /* xlog_ticket_put */
3185
3186
3187/*
David Chinnereb01c9c2008-04-10 12:18:46 +10003188 * Allocate and initialise a new log ticket.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003189 */
David Chinnera8272ce2007-11-23 16:28:09 +11003190STATIC xlog_ticket_t *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003191xlog_ticket_get(xlog_t *log,
3192 int unit_bytes,
3193 int cnt,
3194 char client,
3195 uint xflags)
3196{
3197 xlog_ticket_t *tic;
3198 uint num_headers;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003199
David Chinnereb01c9c2008-04-10 12:18:46 +10003200 tic = kmem_zone_zalloc(xfs_log_ticket_zone, KM_SLEEP|KM_MAYFAIL);
3201 if (!tic)
3202 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003203
3204 /*
3205 * Permanent reservations have up to 'cnt'-1 active log operations
3206 * in the log. A unit in this case is the amount of space for one
3207 * of these log operations. Normal reservations have a cnt of 1
3208 * and their unit amount is the total amount of space required.
3209 *
3210 * The following lines of code account for non-transaction data
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003211 * which occupy space in the on-disk log.
3212 *
3213 * Normal form of a transaction is:
3214 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph>
3215 * and then there are LR hdrs, split-recs and roundoff at end of syncs.
3216 *
3217 * We need to account for all the leadup data and trailer data
3218 * around the transaction data.
3219 * And then we need to account for the worst case in terms of using
3220 * more space.
3221 * The worst case will happen if:
3222 * - the placement of the transaction happens to be such that the
3223 * roundoff is at its maximum
3224 * - the transaction data is synced before the commit record is synced
3225 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff>
3226 * Therefore the commit record is in its own Log Record.
3227 * This can happen as the commit record is called with its
3228 * own region to xlog_write().
3229 * This then means that in the worst case, roundoff can happen for
3230 * the commit-rec as well.
3231 * The commit-rec is smaller than padding in this scenario and so it is
3232 * not added separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233 */
3234
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003235 /* for trans header */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003236 unit_bytes += sizeof(xlog_op_header_t);
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003237 unit_bytes += sizeof(xfs_trans_header_t);
3238
3239 /* for start-rec */
3240 unit_bytes += sizeof(xlog_op_header_t);
3241
Linus Torvalds1da177e2005-04-16 15:20:36 -07003242 /* for LR headers */
3243 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log);
3244 unit_bytes += log->l_iclog_hsize * num_headers;
3245
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003246 /* for commit-rec LR header - note: padding will subsume the ophdr */
3247 unit_bytes += log->l_iclog_hsize;
3248
3249 /* for split-recs - ophdrs added when data split over LRs */
3250 unit_bytes += sizeof(xlog_op_header_t) * num_headers;
3251
3252 /* for roundoff padding for transaction data and one for commit record */
Eric Sandeen62118702008-03-06 13:44:28 +11003253 if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) &&
Tim Shimmin32fb9b52005-09-02 16:41:43 +10003254 log->l_mp->m_sb.sb_logsunit > 1) {
3255 /* log su roundoff */
3256 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit;
3257 } else {
3258 /* BB roundoff */
3259 unit_bytes += 2*BBSIZE;
3260 }
3261
Linus Torvalds1da177e2005-04-16 15:20:36 -07003262 tic->t_unit_res = unit_bytes;
3263 tic->t_curr_res = unit_bytes;
3264 tic->t_cnt = cnt;
3265 tic->t_ocnt = cnt;
3266 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff);
3267 tic->t_clientid = client;
3268 tic->t_flags = XLOG_TIC_INITED;
Tim Shimmin7e9c6392005-09-02 16:42:05 +10003269 tic->t_trans_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003270 if (xflags & XFS_LOG_PERM_RESERV)
3271 tic->t_flags |= XLOG_TIC_PERM_RESERV;
3272 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick");
3273
Christoph Hellwig0adba532007-08-30 17:21:46 +10003274 xlog_tic_reset_res(tic);
Tim Shimmin7e9c6392005-09-02 16:42:05 +10003275
Linus Torvalds1da177e2005-04-16 15:20:36 -07003276 return tic;
3277} /* xlog_ticket_get */
3278
3279
3280/******************************************************************************
3281 *
3282 * Log debug routines
3283 *
3284 ******************************************************************************
3285 */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11003286#if defined(DEBUG)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287/*
3288 * Make sure that the destination ptr is within the valid data region of
3289 * one of the iclogs. This uses backup pointers stored in a different
3290 * part of the log in case we trash the log structure.
3291 */
3292void
3293xlog_verify_dest_ptr(xlog_t *log,
3294 __psint_t ptr)
3295{
3296 int i;
3297 int good_ptr = 0;
3298
3299 for (i=0; i < log->l_iclog_bufs; i++) {
3300 if (ptr >= (__psint_t)log->l_iclog_bak[i] &&
3301 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size)
3302 good_ptr++;
3303 }
3304 if (! good_ptr)
3305 xlog_panic("xlog_verify_dest_ptr: invalid ptr");
3306} /* xlog_verify_dest_ptr */
3307
3308STATIC void
3309xlog_verify_grant_head(xlog_t *log, int equals)
3310{
3311 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) {
3312 if (equals)
3313 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes);
3314 else
3315 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes);
3316 } else {
3317 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle);
3318 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes);
3319 }
3320} /* xlog_verify_grant_head */
3321
3322/* check if it will fit */
3323STATIC void
3324xlog_verify_tail_lsn(xlog_t *log,
3325 xlog_in_core_t *iclog,
3326 xfs_lsn_t tail_lsn)
3327{
3328 int blocks;
3329
3330 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) {
3331 blocks =
3332 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn));
3333 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize))
3334 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3335 } else {
3336 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle);
3337
3338 if (BLOCK_LSN(tail_lsn) == log->l_prev_block)
3339 xlog_panic("xlog_verify_tail_lsn: tail wrapped");
3340
3341 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block;
3342 if (blocks < BTOBB(iclog->ic_offset) + 1)
3343 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3344 }
3345} /* xlog_verify_tail_lsn */
3346
3347/*
3348 * Perform a number of checks on the iclog before writing to disk.
3349 *
3350 * 1. Make sure the iclogs are still circular
3351 * 2. Make sure we have a good magic number
3352 * 3. Make sure we don't have magic numbers in the data
3353 * 4. Check fields of each log operation header for:
3354 * A. Valid client identifier
3355 * B. tid ptr value falls in valid ptr space (user space code)
3356 * C. Length in log record header is correct according to the
3357 * individual operation headers within record.
3358 * 5. When a bwrite will occur within 5 blocks of the front of the physical
3359 * log, check the preceding blocks of the physical log to make sure all
3360 * the cycle numbers agree with the current cycle number.
3361 */
3362STATIC void
3363xlog_verify_iclog(xlog_t *log,
3364 xlog_in_core_t *iclog,
3365 int count,
3366 boolean_t syncing)
3367{
3368 xlog_op_header_t *ophead;
3369 xlog_in_core_t *icptr;
3370 xlog_in_core_2_t *xhdr;
3371 xfs_caddr_t ptr;
3372 xfs_caddr_t base_ptr;
3373 __psint_t field_offset;
3374 __uint8_t clientid;
3375 int len, i, j, k, op_len;
3376 int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003377
3378 /* check validity of iclog pointers */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003379 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003380 icptr = log->l_iclog;
3381 for (i=0; i < log->l_iclog_bufs; i++) {
Christoph Hellwig4b809162007-08-16 15:37:36 +10003382 if (icptr == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003383 xlog_panic("xlog_verify_iclog: invalid ptr");
3384 icptr = icptr->ic_next;
3385 }
3386 if (icptr != log->l_iclog)
3387 xlog_panic("xlog_verify_iclog: corrupt iclog ring");
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003388 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003389
3390 /* check log magic numbers */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003391 if (be32_to_cpu(iclog->ic_header.h_magicno) != XLOG_HEADER_MAGIC_NUM)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003392 xlog_panic("xlog_verify_iclog: invalid magic num");
3393
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003394 ptr = (xfs_caddr_t) &iclog->ic_header;
3395 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003396 ptr += BBSIZE) {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003397 if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003398 xlog_panic("xlog_verify_iclog: unexpected magic num");
3399 }
3400
3401 /* check fields */
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003402 len = be32_to_cpu(iclog->ic_header.h_num_logops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003403 ptr = iclog->ic_datap;
3404 base_ptr = ptr;
3405 ophead = (xlog_op_header_t *)ptr;
3406 xhdr = (xlog_in_core_2_t *)&iclog->ic_header;
3407 for (i = 0; i < len; i++) {
3408 ophead = (xlog_op_header_t *)ptr;
3409
3410 /* clientid is only 1 byte */
3411 field_offset = (__psint_t)
3412 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr);
3413 if (syncing == B_FALSE || (field_offset & 0x1ff)) {
3414 clientid = ophead->oh_clientid;
3415 } else {
3416 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap);
3417 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3418 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3419 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10003420 clientid = xlog_get_client_id(
3421 xhdr[j].hic_xheader.xh_cycle_data[k]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003422 } else {
Christoph Hellwig03bea6f2007-10-12 10:58:05 +10003423 clientid = xlog_get_client_id(
3424 iclog->ic_header.h_cycle_data[idx]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425 }
3426 }
3427 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG)
Christoph Hellwigda1650a2005-11-02 10:21:35 +11003428 cmn_err(CE_WARN, "xlog_verify_iclog: "
3429 "invalid clientid %d op 0x%p offset 0x%lx",
3430 clientid, ophead, (unsigned long)field_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003431
3432 /* check length */
3433 field_offset = (__psint_t)
3434 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr);
3435 if (syncing == B_FALSE || (field_offset & 0x1ff)) {
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +10003436 op_len = be32_to_cpu(ophead->oh_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003437 } else {
3438 idx = BTOBBT((__psint_t)&ophead->oh_len -
3439 (__psint_t)iclog->ic_datap);
3440 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3441 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3442 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003443 op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003444 } else {
Christoph Hellwigb53e6752007-10-12 10:59:34 +10003445 op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003446 }
3447 }
3448 ptr += sizeof(xlog_op_header_t) + op_len;
3449 }
3450} /* xlog_verify_iclog */
Nathan Scottcfcbbbd2005-11-02 15:12:04 +11003451#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07003452
3453/*
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003454 * Mark all iclogs IOERROR. l_icloglock is held by the caller.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003455 */
3456STATIC int
3457xlog_state_ioerror(
3458 xlog_t *log)
3459{
3460 xlog_in_core_t *iclog, *ic;
3461
3462 iclog = log->l_iclog;
3463 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) {
3464 /*
3465 * Mark all the incore logs IOERROR.
3466 * From now on, no log flushes will result.
3467 */
3468 ic = iclog;
3469 do {
3470 ic->ic_state = XLOG_STATE_IOERROR;
3471 ic = ic->ic_next;
3472 } while (ic != iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01003473 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003474 }
3475 /*
3476 * Return non-zero, if state transition has already happened.
3477 */
Jesper Juhl014c2542006-01-15 02:37:08 +01003478 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003479}
3480
3481/*
3482 * This is called from xfs_force_shutdown, when we're forcibly
3483 * shutting down the filesystem, typically because of an IO error.
3484 * Our main objectives here are to make sure that:
3485 * a. the filesystem gets marked 'SHUTDOWN' for all interested
3486 * parties to find out, 'atomically'.
3487 * b. those who're sleeping on log reservations, pinned objects and
3488 * other resources get woken up, and be told the bad news.
3489 * c. nothing new gets queued up after (a) and (b) are done.
3490 * d. if !logerror, flush the iclogs to disk, then seal them off
3491 * for business.
3492 */
3493int
3494xfs_log_force_umount(
3495 struct xfs_mount *mp,
3496 int logerror)
3497{
3498 xlog_ticket_t *tic;
3499 xlog_t *log;
3500 int retval;
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003501 int dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003502
3503 log = mp->m_log;
3504
3505 /*
3506 * If this happens during log recovery, don't worry about
3507 * locking; the log isn't open for business yet.
3508 */
3509 if (!log ||
3510 log->l_flags & XLOG_ACTIVE_RECOVERY) {
3511 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
3512 XFS_BUF_DONE(mp->m_sb_bp);
Jesper Juhl014c2542006-01-15 02:37:08 +01003513 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003514 }
3515
3516 /*
3517 * Somebody could've already done the hard work for us.
3518 * No need to get locks for this.
3519 */
3520 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) {
3521 ASSERT(XLOG_FORCED_SHUTDOWN(log));
Jesper Juhl014c2542006-01-15 02:37:08 +01003522 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003523 }
3524 retval = 0;
3525 /*
3526 * We must hold both the GRANT lock and the LOG lock,
3527 * before we mark the filesystem SHUTDOWN and wake
3528 * everybody up to tell the bad news.
3529 */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003530 spin_lock(&log->l_icloglock);
David Chinner6b1d1a72008-04-10 12:19:02 +10003531 spin_lock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003532 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
3533 XFS_BUF_DONE(mp->m_sb_bp);
3534 /*
3535 * This flag is sort of redundant because of the mount flag, but
3536 * it's good to maintain the separation between the log and the rest
3537 * of XFS.
3538 */
3539 log->l_flags |= XLOG_IO_ERROR;
3540
3541 /*
3542 * If we hit a log error, we want to mark all the iclogs IOERROR
3543 * while we're still holding the loglock.
3544 */
3545 if (logerror)
3546 retval = xlog_state_ioerror(log);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003547 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003548
3549 /*
3550 * We don't want anybody waiting for log reservations
3551 * after this. That means we have to wake up everybody
3552 * queued up on reserve_headq as well as write_headq.
3553 * In addition, we make sure in xlog_{re}grant_log_space
3554 * that we don't enqueue anything once the SHUTDOWN flag
3555 * is set, and this action is protected by the GRANTLOCK.
3556 */
3557 if ((tic = log->l_reserve_headq)) {
3558 do {
3559 sv_signal(&tic->t_sema);
3560 tic = tic->t_next;
3561 } while (tic != log->l_reserve_headq);
3562 }
3563
3564 if ((tic = log->l_write_headq)) {
3565 do {
3566 sv_signal(&tic->t_sema);
3567 tic = tic->t_next;
3568 } while (tic != log->l_write_headq);
3569 }
Eric Sandeenc8b5ea22007-10-11 17:37:31 +10003570 spin_unlock(&log->l_grant_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003571
3572 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) {
3573 ASSERT(!logerror);
3574 /*
3575 * Force the incore logs to disk before shutting the
3576 * log down completely.
3577 */
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11003578 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003579 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003580 retval = xlog_state_ioerror(log);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003581 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003582 }
3583 /*
3584 * Wake up everybody waiting on xfs_log_force.
3585 * Callback all log item committed functions as if the
3586 * log writes were completed.
3587 */
3588 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL);
3589
3590#ifdef XFSERRORDEBUG
3591 {
3592 xlog_in_core_t *iclog;
3593
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003594 spin_lock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003595 iclog = log->l_iclog;
3596 do {
3597 ASSERT(iclog->ic_callback == 0);
3598 iclog = iclog->ic_next;
3599 } while (iclog != log->l_iclog);
Eric Sandeenb22cd72c2007-10-11 17:37:10 +10003600 spin_unlock(&log->l_icloglock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003601 }
3602#endif
3603 /* return non-zero if log IOERROR transition had already happened */
Jesper Juhl014c2542006-01-15 02:37:08 +01003604 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003605}
3606
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10003607STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003608xlog_iclogs_empty(xlog_t *log)
3609{
3610 xlog_in_core_t *iclog;
3611
3612 iclog = log->l_iclog;
3613 do {
3614 /* endianness does not matter here, zero is zero in
3615 * any language.
3616 */
3617 if (iclog->ic_header.h_num_logops)
Jesper Juhl014c2542006-01-15 02:37:08 +01003618 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003619 iclog = iclog->ic_next;
3620 } while (iclog != log->l_iclog);
Jesper Juhl014c2542006-01-15 02:37:08 +01003621 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003622}