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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2003,2005 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 */
18#ifndef __XFS_LOG_PRIV_H__
19#define __XFS_LOG_PRIV_H__
20
21struct xfs_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070022struct log;
Nathan Scotta844f452005-11-02 14:38:42 +110023struct xlog_ticket;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024struct xfs_buf_cancel;
25struct xfs_mount;
26
27/*
28 * Macros, structures, prototypes for internal log manager use.
29 */
30
31#define XLOG_MIN_ICLOGS 2
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#define XLOG_MAX_ICLOGS 8
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */
34#define XLOG_VERSION_1 1
35#define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */
36#define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2)
Eric Sandeendcb3b832007-08-16 16:25:33 +100037#define XLOG_MIN_RECORD_BSIZE (16*1024) /* eventually 32k */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#define XLOG_BIG_RECORD_BSIZE (32*1024) /* 32k buffers */
39#define XLOG_MAX_RECORD_BSIZE (256*1024)
40#define XLOG_HEADER_CYCLE_SIZE (32*1024) /* cycle data in header */
Eric Sandeendcb3b832007-08-16 16:25:33 +100041#define XLOG_MIN_RECORD_BSHIFT 14 /* 16384 == 1 << 14 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define XLOG_BIG_RECORD_BSHIFT 15 /* 32k == 1 << 15 */
43#define XLOG_MAX_RECORD_BSHIFT 18 /* 256k == 1 << 18 */
44#define XLOG_BTOLSUNIT(log, b) (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \
45 (log)->l_mp->m_sb.sb_logsunit)
46#define XLOG_LSUNITTOB(log, su) ((su) * (log)->l_mp->m_sb.sb_logsunit)
47
48#define XLOG_HEADER_SIZE 512
49
50#define XLOG_REC_SHIFT(log) \
Eric Sandeen62118702008-03-06 13:44:28 +110051 BTOBB(1 << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
53#define XLOG_TOTAL_REC_SHIFT(log) \
Eric Sandeen62118702008-03-06 13:44:28 +110054 BTOBB(XLOG_MAX_ICLOGS << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Christoph Hellwig03bea6f2007-10-12 10:58:05 +100058static inline xfs_lsn_t xlog_assign_lsn(uint cycle, uint block)
59{
60 return ((xfs_lsn_t)cycle << 32) | block;
61}
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Christoph Hellwig03bea6f2007-10-12 10:58:05 +100063static inline uint xlog_get_cycle(char *ptr)
64{
Christoph Hellwigb53e6752007-10-12 10:59:34 +100065 if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM)
66 return be32_to_cpu(*((__be32 *)ptr + 1));
Christoph Hellwig03bea6f2007-10-12 10:58:05 +100067 else
Christoph Hellwigb53e6752007-10-12 10:59:34 +100068 return be32_to_cpu(*(__be32 *)ptr);
Christoph Hellwig03bea6f2007-10-12 10:58:05 +100069}
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71#define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1)
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#ifdef __KERNEL__
74
75/*
76 * get client id from packed copy.
77 *
78 * this hack is here because the xlog_pack code copies four bytes
79 * of xlog_op_header containing the fields oh_clientid, oh_flags
80 * and oh_res2 into the packed copy.
81 *
82 * later on this four byte chunk is treated as an int and the
83 * client id is pulled out.
84 *
85 * this has endian issues, of course.
86 */
Christoph Hellwigb53e6752007-10-12 10:59:34 +100087static inline uint xlog_get_client_id(__be32 i)
Christoph Hellwig03bea6f2007-10-12 10:58:05 +100088{
Christoph Hellwigb53e6752007-10-12 10:59:34 +100089 return be32_to_cpu(i) >> 24;
Christoph Hellwig03bea6f2007-10-12 10:58:05 +100090}
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Linus Torvalds1da177e2005-04-16 15:20:36 -070092#define xlog_panic(args...) cmn_err(CE_PANIC, ## args)
93#define xlog_exit(args...) cmn_err(CE_PANIC, ## args)
94#define xlog_warn(args...) cmn_err(CE_WARN, ## args)
95
96/*
97 * In core log state
98 */
99#define XLOG_STATE_ACTIVE 0x0001 /* Current IC log being written to */
100#define XLOG_STATE_WANT_SYNC 0x0002 /* Want to sync this iclog; no more writes */
101#define XLOG_STATE_SYNCING 0x0004 /* This IC log is syncing */
102#define XLOG_STATE_DONE_SYNC 0x0008 /* Done syncing to disk */
103#define XLOG_STATE_DO_CALLBACK \
104 0x0010 /* Process callback functions */
105#define XLOG_STATE_CALLBACK 0x0020 /* Callback functions now */
106#define XLOG_STATE_DIRTY 0x0040 /* Dirty IC log, not ready for ACTIVE status*/
107#define XLOG_STATE_IOERROR 0x0080 /* IO error happened in sync'ing log */
108#define XLOG_STATE_ALL 0x7FFF /* All possible valid flags */
109#define XLOG_STATE_NOTUSED 0x8000 /* This IC log not being used */
110#endif /* __KERNEL__ */
111
112/*
113 * Flags to log operation header
114 *
115 * The first write of a new transaction will be preceded with a start
116 * record, XLOG_START_TRANS. Once a transaction is committed, a commit
117 * record is written, XLOG_COMMIT_TRANS. If a single region can not fit into
118 * the remainder of the current active in-core log, it is split up into
119 * multiple regions. Each partial region will be marked with a
120 * XLOG_CONTINUE_TRANS until the last one, which gets marked with XLOG_END_TRANS.
121 *
122 */
123#define XLOG_START_TRANS 0x01 /* Start a new transaction */
124#define XLOG_COMMIT_TRANS 0x02 /* Commit this transaction */
125#define XLOG_CONTINUE_TRANS 0x04 /* Cont this trans into new region */
126#define XLOG_WAS_CONT_TRANS 0x08 /* Cont this trans into new region */
127#define XLOG_END_TRANS 0x10 /* End a continued transaction */
128#define XLOG_UNMOUNT_TRANS 0x20 /* Unmount a filesystem transaction */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130#ifdef __KERNEL__
131/*
132 * Flags to log ticket
133 */
134#define XLOG_TIC_INITED 0x1 /* has been initialized */
135#define XLOG_TIC_PERM_RESERV 0x2 /* permanent reservation */
136#define XLOG_TIC_IN_Q 0x4
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000137
138#define XLOG_TIC_FLAGS \
139 { XLOG_TIC_INITED, "XLOG_TIC_INITED" }, \
140 { XLOG_TIC_PERM_RESERV, "XLOG_TIC_PERM_RESERV" }, \
141 { XLOG_TIC_IN_Q, "XLOG_TIC_IN_Q" }
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143#endif /* __KERNEL__ */
144
145#define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */
146
147/*
148 * Flags for log structure
149 */
150#define XLOG_CHKSUM_MISMATCH 0x1 /* used only during recovery */
151#define XLOG_ACTIVE_RECOVERY 0x2 /* in the middle of recovery */
152#define XLOG_RECOVERY_NEEDED 0x4 /* log was recovered */
153#define XLOG_IO_ERROR 0x8 /* log hit an I/O error, and being
154 shutdown */
155typedef __uint32_t xlog_tid_t;
156
157
158#ifdef __KERNEL__
159/*
160 * Below are states for covering allocation transactions.
161 * By covering, we mean changing the h_tail_lsn in the last on-disk
162 * log write such that no allocation transactions will be re-done during
163 * recovery after a system crash. Recovery starts at the last on-disk
164 * log write.
165 *
166 * These states are used to insert dummy log entries to cover
167 * space allocation transactions which can undo non-transactional changes
168 * after a crash. Writes to a file with space
169 * already allocated do not result in any transactions. Allocations
170 * might include space beyond the EOF. So if we just push the EOF a
171 * little, the last transaction for the file could contain the wrong
172 * size. If there is no file system activity, after an allocation
173 * transaction, and the system crashes, the allocation transaction
174 * will get replayed and the file will be truncated. This could
175 * be hours/days/... after the allocation occurred.
176 *
177 * The fix for this is to do two dummy transactions when the
178 * system is idle. We need two dummy transaction because the h_tail_lsn
179 * in the log record header needs to point beyond the last possible
180 * non-dummy transaction. The first dummy changes the h_tail_lsn to
181 * the first transaction before the dummy. The second dummy causes
182 * h_tail_lsn to point to the first dummy. Recovery starts at h_tail_lsn.
183 *
184 * These dummy transactions get committed when everything
185 * is idle (after there has been some activity).
186 *
187 * There are 5 states used to control this.
188 *
189 * IDLE -- no logging has been done on the file system or
190 * we are done covering previous transactions.
191 * NEED -- logging has occurred and we need a dummy transaction
192 * when the log becomes idle.
193 * DONE -- we were in the NEED state and have committed a dummy
194 * transaction.
195 * NEED2 -- we detected that a dummy transaction has gone to the
196 * on disk log with no other transactions.
197 * DONE2 -- we committed a dummy transaction when in the NEED2 state.
198 *
199 * There are two places where we switch states:
200 *
201 * 1.) In xfs_sync, when we detect an idle log and are in NEED or NEED2.
202 * We commit the dummy transaction and switch to DONE or DONE2,
203 * respectively. In all other states, we don't do anything.
204 *
205 * 2.) When we finish writing the on-disk log (xlog_state_clean_log).
206 *
207 * No matter what state we are in, if this isn't the dummy
208 * transaction going out, the next state is NEED.
209 * So, if we aren't in the DONE or DONE2 states, the next state
210 * is NEED. We can't be finishing a write of the dummy record
211 * unless it was committed and the state switched to DONE or DONE2.
212 *
213 * If we are in the DONE state and this was a write of the
214 * dummy transaction, we move to NEED2.
215 *
216 * If we are in the DONE2 state and this was a write of the
217 * dummy transaction, we move to IDLE.
218 *
219 *
220 * Writing only one dummy transaction can get appended to
221 * one file space allocation. When this happens, the log recovery
222 * code replays the space allocation and a file could be truncated.
223 * This is why we have the NEED2 and DONE2 states before going idle.
224 */
225
226#define XLOG_STATE_COVER_IDLE 0
227#define XLOG_STATE_COVER_NEED 1
228#define XLOG_STATE_COVER_DONE 2
229#define XLOG_STATE_COVER_NEED2 3
230#define XLOG_STATE_COVER_DONE2 4
231
232#define XLOG_COVER_OPS 5
233
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000234
235/* Ticket reservation region accounting */
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000236#define XLOG_TIC_LEN_MAX 15
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000237
238/*
239 * Reservation region
240 * As would be stored in xfs_log_iovec but without the i_addr which
241 * we don't care about.
242 */
243typedef struct xlog_res {
Tim Shimmin12598452006-01-11 21:02:47 +1100244 uint r_len; /* region length :4 */
245 uint r_type; /* region's transaction type :4 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000246} xlog_res_t;
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248typedef struct xlog_ticket {
David Chinner12017fa2008-08-13 16:34:31 +1000249 sv_t t_wait; /* ticket wait queue : 20 */
David Chinnereb01c9c2008-04-10 12:18:46 +1000250 struct xlog_ticket *t_next; /* :4|8 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000251 struct xlog_ticket *t_prev; /* :4|8 */
252 xlog_tid_t t_tid; /* transaction identifier : 4 */
Dave Chinnercc09c0d2008-11-17 17:37:10 +1100253 atomic_t t_ref; /* ticket reference count : 4 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000254 int t_curr_res; /* current reservation in bytes : 4 */
255 int t_unit_res; /* unit reservation in bytes : 4 */
256 char t_ocnt; /* original count : 1 */
257 char t_cnt; /* current count : 1 */
258 char t_clientid; /* who does this belong to; : 1 */
259 char t_flags; /* properties of reservation : 1 */
260 uint t_trans_type; /* transaction type : 4 */
261
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000262 /* reservation array fields */
263 uint t_res_num; /* num in array : 4 */
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000264 uint t_res_num_ophdrs; /* num op hdrs : 4 */
265 uint t_res_arr_sum; /* array sum : 4 */
266 uint t_res_o_flow; /* sum overflow : 4 */
Tim Shimmin12598452006-01-11 21:02:47 +1100267 xlog_res_t t_res_arr[XLOG_TIC_LEN_MAX]; /* array of res : 8 * 15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268} xlog_ticket_t;
Tim Shimmin7e9c6392005-09-02 16:42:05 +1000269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270#endif
271
272
273typedef struct xlog_op_header {
Christoph Hellwig67fcb7b2007-10-12 10:58:59 +1000274 __be32 oh_tid; /* transaction id of operation : 4 b */
275 __be32 oh_len; /* bytes in data region : 4 b */
276 __u8 oh_clientid; /* who sent me this : 1 b */
277 __u8 oh_flags; /* : 1 b */
278 __u16 oh_res2; /* 32 bit align : 2 b */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279} xlog_op_header_t;
280
281
282/* valid values for h_fmt */
283#define XLOG_FMT_UNKNOWN 0
284#define XLOG_FMT_LINUX_LE 1
285#define XLOG_FMT_LINUX_BE 2
286#define XLOG_FMT_IRIX_BE 3
287
288/* our fmt */
Nathan Scottf016bad2005-09-08 15:30:05 +1000289#ifdef XFS_NATIVE_HOST
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290#define XLOG_FMT XLOG_FMT_LINUX_BE
291#else
Nathan Scottf016bad2005-09-08 15:30:05 +1000292#define XLOG_FMT XLOG_FMT_LINUX_LE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293#endif
294
295typedef struct xlog_rec_header {
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000296 __be32 h_magicno; /* log record (LR) identifier : 4 */
297 __be32 h_cycle; /* write cycle of log : 4 */
298 __be32 h_version; /* LR version : 4 */
299 __be32 h_len; /* len in bytes; should be 64-bit aligned: 4 */
300 __be64 h_lsn; /* lsn of this LR : 8 */
301 __be64 h_tail_lsn; /* lsn of 1st LR w/ buffers not committed: 8 */
302 __be32 h_chksum; /* may not be used; non-zero if used : 4 */
303 __be32 h_prev_block; /* block number to previous LR : 4 */
304 __be32 h_num_logops; /* number of log operations in this LR : 4 */
305 __be32 h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 /* new fields */
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000307 __be32 h_fmt; /* format of log record : 4 */
308 uuid_t h_fs_uuid; /* uuid of FS : 16 */
309 __be32 h_size; /* iclog size : 4 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310} xlog_rec_header_t;
311
312typedef struct xlog_rec_ext_header {
Christoph Hellwigb53e6752007-10-12 10:59:34 +1000313 __be32 xh_cycle; /* write cycle of log : 4 */
314 __be32 xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /* : 256 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315} xlog_rec_ext_header_t;
316
317#ifdef __KERNEL__
Christoph Hellwigb28708d2008-11-28 14:23:38 +1100318
319/*
320 * Quite misnamed, because this union lays out the actual on-disk log buffer.
321 */
322typedef union xlog_in_core2 {
323 xlog_rec_header_t hic_header;
324 xlog_rec_ext_header_t hic_xheader;
325 char hic_sector[XLOG_HEADER_SIZE];
326} xlog_in_core_2_t;
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328/*
329 * - A log record header is 512 bytes. There is plenty of room to grow the
330 * xlog_rec_header_t into the reserved space.
331 * - ic_data follows, so a write to disk can start at the beginning of
332 * the iclog.
David Chinner12017fa2008-08-13 16:34:31 +1000333 * - ic_forcewait is used to implement synchronous forcing of the iclog to disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 * - ic_next is the pointer to the next iclog in the ring.
335 * - ic_bp is a pointer to the buffer used to write this incore log to disk.
336 * - ic_log is a pointer back to the global log structure.
337 * - ic_callback is a linked list of callback function/argument pairs to be
338 * called after an iclog finishes writing.
339 * - ic_size is the full size of the header plus data.
340 * - ic_offset is the current number of bytes written to in this iclog.
341 * - ic_refcnt is bumped when someone is writing to the log.
342 * - ic_state is the state of the iclog.
David Chinner114d23a2008-04-10 12:18:39 +1000343 *
344 * Because of cacheline contention on large machines, we need to separate
345 * various resources onto different cachelines. To start with, make the
346 * structure cacheline aligned. The following fields can be contended on
347 * by independent processes:
348 *
349 * - ic_callback_*
350 * - ic_refcnt
351 * - fields protected by the global l_icloglock
352 *
353 * so we need to ensure that these fields are located in separate cachelines.
354 * We'll put all the read-only and l_icloglock fields in the first cacheline,
355 * and move everything else out to subsequent cachelines.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 */
Christoph Hellwigb28708d2008-11-28 14:23:38 +1100357typedef struct xlog_in_core {
David Chinner12017fa2008-08-13 16:34:31 +1000358 sv_t ic_force_wait;
359 sv_t ic_write_wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 struct xlog_in_core *ic_next;
361 struct xlog_in_core *ic_prev;
362 struct xfs_buf *ic_bp;
363 struct log *ic_log;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 int ic_size;
365 int ic_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 int ic_bwritecnt;
Christoph Hellwiga5687782009-02-09 08:37:39 +0100367 unsigned short ic_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 char *ic_datap; /* pointer to iclog data */
David Chinner114d23a2008-04-10 12:18:39 +1000369
370 /* Callback structures need their own cacheline */
371 spinlock_t ic_callback_lock ____cacheline_aligned_in_smp;
372 xfs_log_callback_t *ic_callback;
373 xfs_log_callback_t **ic_callback_tail;
374
375 /* reference counts need their own cacheline */
376 atomic_t ic_refcnt ____cacheline_aligned_in_smp;
Christoph Hellwigb28708d2008-11-28 14:23:38 +1100377 xlog_in_core_2_t *ic_data;
378#define ic_header ic_data->hic_header
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379} xlog_in_core_t;
380
381/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 * The reservation head lsn is not made up of a cycle number and block number.
383 * Instead, it uses a cycle number and byte number. Logs don't expect to
384 * overflow 31 bits worth of byte offset, so using a byte number will mean
385 * that round off problems won't occur when releasing partial reservations.
386 */
387typedef struct log {
David Chinner4679b2d2008-04-10 12:18:54 +1000388 /* The following fields don't need locking */
389 struct xfs_mount *l_mp; /* mount point */
David Chinnera9c21c12008-10-30 17:39:35 +1100390 struct xfs_ail *l_ailp; /* AIL log is working with */
David Chinner4679b2d2008-04-10 12:18:54 +1000391 struct xfs_buf *l_xbuf; /* extra buffer for log
392 * wrapping */
393 struct xfs_buftarg *l_targ; /* buftarg of log */
394 uint l_flags;
395 uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */
396 struct xfs_buf_cancel **l_buf_cancel_table;
397 int l_iclog_hsize; /* size of iclog header */
398 int l_iclog_heads; /* # of iclog header sectors */
399 uint l_sectbb_log; /* log2 of sector size in BBs */
400 uint l_sectbb_mask; /* sector size (in BBs)
401 * alignment mask */
402 int l_iclog_size; /* size of log in bytes */
403 int l_iclog_size_log; /* log power size of log */
404 int l_iclog_bufs; /* number of iclog buffers */
405 xfs_daddr_t l_logBBstart; /* start block of log */
406 int l_logsize; /* size of log in bytes */
407 int l_logBBsize; /* size of log in BB chunks */
408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 /* The following block of fields are changed while holding icloglock */
Matthew Wilcoxd748c622008-05-19 16:34:27 +1000410 sv_t l_flush_wait ____cacheline_aligned_in_smp;
411 /* waiting for iclog flush */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 int l_covered_state;/* state of "covering disk
413 * log entries" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 xlog_in_core_t *l_iclog; /* head log queue */
Eric Sandeenb22cd72c2007-10-11 17:37:10 +1000415 spinlock_t l_icloglock; /* grab to change iclog state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 xfs_lsn_t l_tail_lsn; /* lsn of 1st LR with unflushed
417 * buffers */
418 xfs_lsn_t l_last_sync_lsn;/* lsn of last LR on disk */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 int l_curr_cycle; /* Cycle number of log writes */
420 int l_prev_cycle; /* Cycle number before last
421 * block increment */
422 int l_curr_block; /* current logical log block */
423 int l_prev_block; /* previous logical log block */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 /* The following block of fields are changed while holding grant_lock */
David Chinner4679b2d2008-04-10 12:18:54 +1000426 spinlock_t l_grant_lock ____cacheline_aligned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 xlog_ticket_t *l_reserve_headq;
428 xlog_ticket_t *l_write_headq;
429 int l_grant_reserve_cycle;
430 int l_grant_reserve_bytes;
431 int l_grant_write_cycle;
432 int l_grant_write_bytes;
433
David Chinner4679b2d2008-04-10 12:18:54 +1000434 /* The following field are used for debugging; need to hold icloglock */
435#ifdef DEBUG
436 char *l_iclog_bak[XLOG_MAX_ICLOGS];
437#endif
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439} xlog_t;
440
Nathan Scottcfcbbbd2005-11-02 15:12:04 +1100441#define XLOG_FORCED_SHUTDOWN(log) ((log)->l_flags & XLOG_IO_ERROR)
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444/* common routines */
445extern xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
Eric Sandeen65be6052006-01-11 15:34:19 +1100446extern int xlog_recover(xlog_t *log);
Christoph Hellwig42490232008-08-13 16:49:32 +1000447extern int xlog_recover_finish(xlog_t *log);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448extern void xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
David Chinnereb01c9c2008-04-10 12:18:46 +1000450extern kmem_zone_t *xfs_log_ticket_zone;
451
Tim Shimmin955e47a2006-09-28 11:04:16 +1000452/*
453 * Unmount record type is used as a pseudo transaction type for the ticket.
454 * It's value must be outside the range of XFS_TRANS_* values.
455 */
456#define XLOG_UNMOUNT_REC_TYPE (-1U)
457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458#endif /* __KERNEL__ */
459
460#endif /* __XFS_LOG_PRIV_H__ */