1 /* 2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * Further, this software is distributed without any warranty that it is 13 * free of the rightful claim of any third person regarding infringement 14 * or the like. Any license provided herein, whether implied or 15 * otherwise, applies only to this software file. Patent licenses, if 16 * any, provided herein do not apply to combinations of this program with 17 * other software, or any other product whatsoever. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write the Free Software Foundation, Inc., 59 21 * Temple Place - Suite 330, Boston MA 02111-1307, USA. 22 * 23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, 24 * Mountain View, CA 94043, or: 25 * 26 * http://www.sgi.com 27 * 28 * For further information regarding this notice, see: 29 * 30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ 31 */ 32 #ifndef __XFS_LOG_PRIV_H__ 33 #define __XFS_LOG_PRIV_H__ 34 35 struct xfs_buf; 36 struct ktrace; 37 struct log; 38 struct xfs_buf_cancel; 39 struct xfs_mount; 40 41 /* 42 * Macros, structures, prototypes for internal log manager use. 43 */ 44 45 #define XLOG_MIN_ICLOGS 2 46 #define XLOG_MED_ICLOGS 4 47 #define XLOG_MAX_ICLOGS 8 48 #define XLOG_CALLBACK_SIZE 10 49 #define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */ 50 #define XLOG_VERSION_1 1 51 #define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */ 52 #define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2) 53 #define XLOG_RECORD_BSIZE (16*1024) /* eventually 32k */ 54 #define XLOG_BIG_RECORD_BSIZE (32*1024) /* 32k buffers */ 55 #define XLOG_MAX_RECORD_BSIZE (256*1024) 56 #define XLOG_HEADER_CYCLE_SIZE (32*1024) /* cycle data in header */ 57 #define XLOG_RECORD_BSHIFT 14 /* 16384 == 1 << 14 */ 58 #define XLOG_BIG_RECORD_BSHIFT 15 /* 32k == 1 << 15 */ 59 #define XLOG_MAX_RECORD_BSHIFT 18 /* 256k == 1 << 18 */ 60 #define XLOG_BTOLSUNIT(log, b) (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \ 61 (log)->l_mp->m_sb.sb_logsunit) 62 #define XLOG_LSUNITTOB(log, su) ((su) * (log)->l_mp->m_sb.sb_logsunit) 63 64 #define XLOG_HEADER_SIZE 512 65 66 #define XLOG_REC_SHIFT(log) \ 67 BTOBB(1 << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \ 68 XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) 69 #define XLOG_TOTAL_REC_SHIFT(log) \ 70 BTOBB(XLOG_MAX_ICLOGS << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \ 71 XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) 72 73 /* 74 * set lsns 75 */ 76 77 #define ASSIGN_ANY_LSN_HOST(lsn,cycle,block) \ 78 { \ 79 (lsn) = ((xfs_lsn_t)(cycle)<<32)|(block); \ 80 } 81 #define ASSIGN_ANY_LSN_DISK(lsn,cycle,block) \ 82 { \ 83 INT_SET(((uint *)&(lsn))[0], ARCH_CONVERT, (cycle)); \ 84 INT_SET(((uint *)&(lsn))[1], ARCH_CONVERT, (block)); \ 85 } 86 #define ASSIGN_LSN(lsn,log) \ 87 ASSIGN_ANY_LSN_DISK(lsn,(log)->l_curr_cycle,(log)->l_curr_block); 88 89 #define XLOG_SET(f,b) (((f) & (b)) == (b)) 90 91 #define GET_CYCLE(ptr, arch) \ 92 (INT_GET(*(uint *)(ptr), arch) == XLOG_HEADER_MAGIC_NUM ? \ 93 INT_GET(*((uint *)(ptr)+1), arch) : \ 94 INT_GET(*(uint *)(ptr), arch) \ 95 ) 96 97 #define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1) 98 99 100 #ifdef __KERNEL__ 101 102 /* 103 * get client id from packed copy. 104 * 105 * this hack is here because the xlog_pack code copies four bytes 106 * of xlog_op_header containing the fields oh_clientid, oh_flags 107 * and oh_res2 into the packed copy. 108 * 109 * later on this four byte chunk is treated as an int and the 110 * client id is pulled out. 111 * 112 * this has endian issues, of course. 113 */ 114 115 #ifndef XFS_NATIVE_HOST 116 #define GET_CLIENT_ID(i,arch) \ 117 ((i) & 0xff) 118 #else 119 #define GET_CLIENT_ID(i,arch) \ 120 ((i) >> 24) 121 #endif 122 123 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XLOG_GRANT_SUB_SPACE) 124 void xlog_grant_sub_space(struct log *log, int bytes, int type); 125 #define XLOG_GRANT_SUB_SPACE(log,bytes,type) \ 126 xlog_grant_sub_space(log,bytes,type) 127 #else 128 #define XLOG_GRANT_SUB_SPACE(log,bytes,type) \ 129 { \ 130 if (type == 'w') { \ 131 (log)->l_grant_write_bytes -= (bytes); \ 132 if ((log)->l_grant_write_bytes < 0) { \ 133 (log)->l_grant_write_bytes += (log)->l_logsize; \ 134 (log)->l_grant_write_cycle--; \ 135 } \ 136 } else { \ 137 (log)->l_grant_reserve_bytes -= (bytes); \ 138 if ((log)->l_grant_reserve_bytes < 0) { \ 139 (log)->l_grant_reserve_bytes += (log)->l_logsize;\ 140 (log)->l_grant_reserve_cycle--; \ 141 } \ 142 } \ 143 } 144 #endif 145 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XLOG_GRANT_ADD_SPACE) 146 void xlog_grant_add_space(struct log *log, int bytes, int type); 147 #define XLOG_GRANT_ADD_SPACE(log,bytes,type) \ 148 xlog_grant_add_space(log,bytes,type) 149 #else 150 #define XLOG_GRANT_ADD_SPACE(log,bytes,type) \ 151 { \ 152 if (type == 'w') { \ 153 (log)->l_grant_write_bytes += (bytes); \ 154 if ((log)->l_grant_write_bytes > (log)->l_logsize) { \ 155 (log)->l_grant_write_bytes -= (log)->l_logsize; \ 156 (log)->l_grant_write_cycle++; \ 157 } \ 158 } else { \ 159 (log)->l_grant_reserve_bytes += (bytes); \ 160 if ((log)->l_grant_reserve_bytes > (log)->l_logsize) { \ 161 (log)->l_grant_reserve_bytes -= (log)->l_logsize;\ 162 (log)->l_grant_reserve_cycle++; \ 163 } \ 164 } \ 165 } 166 #endif 167 #define XLOG_INS_TICKETQ(q,tic) \ 168 { \ 169 if (q) { \ 170 (tic)->t_next = (q); \ 171 (tic)->t_prev = (q)->t_prev; \ 172 (q)->t_prev->t_next = (tic); \ 173 (q)->t_prev = (tic); \ 174 } else { \ 175 (tic)->t_prev = (tic)->t_next = (tic); \ 176 (q) = (tic); \ 177 } \ 178 (tic)->t_flags |= XLOG_TIC_IN_Q; \ 179 } 180 #define XLOG_DEL_TICKETQ(q,tic) \ 181 { \ 182 if ((tic) == (tic)->t_next) { \ 183 (q) = NULL; \ 184 } else { \ 185 (q) = (tic)->t_next; \ 186 (tic)->t_next->t_prev = (tic)->t_prev; \ 187 (tic)->t_prev->t_next = (tic)->t_next; \ 188 } \ 189 (tic)->t_next = (tic)->t_prev = NULL; \ 190 (tic)->t_flags &= ~XLOG_TIC_IN_Q; \ 191 } 192 193 194 #define GRANT_LOCK(log) mutex_spinlock(&(log)->l_grant_lock) 195 #define GRANT_UNLOCK(log, s) mutex_spinunlock(&(log)->l_grant_lock, s) 196 #define LOG_LOCK(log) mutex_spinlock(&(log)->l_icloglock) 197 #define LOG_UNLOCK(log, s) mutex_spinunlock(&(log)->l_icloglock, s) 198 199 #define xlog_panic(args...) cmn_err(CE_PANIC, ## args) 200 #define xlog_exit(args...) cmn_err(CE_PANIC, ## args) 201 #define xlog_warn(args...) cmn_err(CE_WARN, ## args) 202 203 /* 204 * In core log state 205 */ 206 #define XLOG_STATE_ACTIVE 0x0001 /* Current IC log being written to */ 207 #define XLOG_STATE_WANT_SYNC 0x0002 /* Want to sync this iclog; no more writes */ 208 #define XLOG_STATE_SYNCING 0x0004 /* This IC log is syncing */ 209 #define XLOG_STATE_DONE_SYNC 0x0008 /* Done syncing to disk */ 210 #define XLOG_STATE_DO_CALLBACK \ 211 0x0010 /* Process callback functions */ 212 #define XLOG_STATE_CALLBACK 0x0020 /* Callback functions now */ 213 #define XLOG_STATE_DIRTY 0x0040 /* Dirty IC log, not ready for ACTIVE status*/ 214 #define XLOG_STATE_IOERROR 0x0080 /* IO error happened in sync'ing log */ 215 #define XLOG_STATE_ALL 0x7FFF /* All possible valid flags */ 216 #define XLOG_STATE_NOTUSED 0x8000 /* This IC log not being used */ 217 #endif /* __KERNEL__ */ 218 219 /* 220 * Flags to log operation header 221 * 222 * The first write of a new transaction will be preceded with a start 223 * record, XLOG_START_TRANS. Once a transaction is committed, a commit 224 * record is written, XLOG_COMMIT_TRANS. If a single region can not fit into 225 * the remainder of the current active in-core log, it is split up into 226 * multiple regions. Each partial region will be marked with a 227 * XLOG_CONTINUE_TRANS until the last one, which gets marked with XLOG_END_TRANS. 228 * 229 */ 230 #define XLOG_START_TRANS 0x01 /* Start a new transaction */ 231 #define XLOG_COMMIT_TRANS 0x02 /* Commit this transaction */ 232 #define XLOG_CONTINUE_TRANS 0x04 /* Cont this trans into new region */ 233 #define XLOG_WAS_CONT_TRANS 0x08 /* Cont this trans into new region */ 234 #define XLOG_END_TRANS 0x10 /* End a continued transaction */ 235 #define XLOG_UNMOUNT_TRANS 0x20 /* Unmount a filesystem transaction */ 236 #define XLOG_SKIP_TRANS (XLOG_COMMIT_TRANS | XLOG_CONTINUE_TRANS | \ 237 XLOG_WAS_CONT_TRANS | XLOG_END_TRANS | \ 238 XLOG_UNMOUNT_TRANS) 239 240 #ifdef __KERNEL__ 241 /* 242 * Flags to log ticket 243 */ 244 #define XLOG_TIC_INITED 0x1 /* has been initialized */ 245 #define XLOG_TIC_PERM_RESERV 0x2 /* permanent reservation */ 246 #define XLOG_TIC_IN_Q 0x4 247 #endif /* __KERNEL__ */ 248 249 #define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */ 250 251 /* 252 * Flags for log structure 253 */ 254 #define XLOG_CHKSUM_MISMATCH 0x1 /* used only during recovery */ 255 #define XLOG_ACTIVE_RECOVERY 0x2 /* in the middle of recovery */ 256 #define XLOG_RECOVERY_NEEDED 0x4 /* log was recovered */ 257 #define XLOG_IO_ERROR 0x8 /* log hit an I/O error, and being 258 shutdown */ 259 typedef __uint32_t xlog_tid_t; 260 261 262 #ifdef __KERNEL__ 263 /* 264 * Below are states for covering allocation transactions. 265 * By covering, we mean changing the h_tail_lsn in the last on-disk 266 * log write such that no allocation transactions will be re-done during 267 * recovery after a system crash. Recovery starts at the last on-disk 268 * log write. 269 * 270 * These states are used to insert dummy log entries to cover 271 * space allocation transactions which can undo non-transactional changes 272 * after a crash. Writes to a file with space 273 * already allocated do not result in any transactions. Allocations 274 * might include space beyond the EOF. So if we just push the EOF a 275 * little, the last transaction for the file could contain the wrong 276 * size. If there is no file system activity, after an allocation 277 * transaction, and the system crashes, the allocation transaction 278 * will get replayed and the file will be truncated. This could 279 * be hours/days/... after the allocation occurred. 280 * 281 * The fix for this is to do two dummy transactions when the 282 * system is idle. We need two dummy transaction because the h_tail_lsn 283 * in the log record header needs to point beyond the last possible 284 * non-dummy transaction. The first dummy changes the h_tail_lsn to 285 * the first transaction before the dummy. The second dummy causes 286 * h_tail_lsn to point to the first dummy. Recovery starts at h_tail_lsn. 287 * 288 * These dummy transactions get committed when everything 289 * is idle (after there has been some activity). 290 * 291 * There are 5 states used to control this. 292 * 293 * IDLE -- no logging has been done on the file system or 294 * we are done covering previous transactions. 295 * NEED -- logging has occurred and we need a dummy transaction 296 * when the log becomes idle. 297 * DONE -- we were in the NEED state and have committed a dummy 298 * transaction. 299 * NEED2 -- we detected that a dummy transaction has gone to the 300 * on disk log with no other transactions. 301 * DONE2 -- we committed a dummy transaction when in the NEED2 state. 302 * 303 * There are two places where we switch states: 304 * 305 * 1.) In xfs_sync, when we detect an idle log and are in NEED or NEED2. 306 * We commit the dummy transaction and switch to DONE or DONE2, 307 * respectively. In all other states, we don't do anything. 308 * 309 * 2.) When we finish writing the on-disk log (xlog_state_clean_log). 310 * 311 * No matter what state we are in, if this isn't the dummy 312 * transaction going out, the next state is NEED. 313 * So, if we aren't in the DONE or DONE2 states, the next state 314 * is NEED. We can't be finishing a write of the dummy record 315 * unless it was committed and the state switched to DONE or DONE2. 316 * 317 * If we are in the DONE state and this was a write of the 318 * dummy transaction, we move to NEED2. 319 * 320 * If we are in the DONE2 state and this was a write of the 321 * dummy transaction, we move to IDLE. 322 * 323 * 324 * Writing only one dummy transaction can get appended to 325 * one file space allocation. When this happens, the log recovery 326 * code replays the space allocation and a file could be truncated. 327 * This is why we have the NEED2 and DONE2 states before going idle. 328 */ 329 330 #define XLOG_STATE_COVER_IDLE 0 331 #define XLOG_STATE_COVER_NEED 1 332 #define XLOG_STATE_COVER_DONE 2 333 #define XLOG_STATE_COVER_NEED2 3 334 #define XLOG_STATE_COVER_DONE2 4 335 336 #define XLOG_COVER_OPS 5 337 338 339 /* Ticket reservation region accounting */ 340 #if defined(XFS_LOG_RES_DEBUG) 341 #define XLOG_TIC_LEN_MAX 15 342 #define XLOG_TIC_RESET_RES(t) ((t)->t_res_num = \ 343 (t)->t_res_arr_sum = (t)->t_res_num_ophdrs = 0) 344 #define XLOG_TIC_ADD_OPHDR(t) ((t)->t_res_num_ophdrs++) 345 #define XLOG_TIC_ADD_REGION(t, len, type) \ 346 do { \ 347 if ((t)->t_res_num == XLOG_TIC_LEN_MAX) { \ 348 /* add to overflow and start again */ \ 349 (t)->t_res_o_flow += (t)->t_res_arr_sum; \ 350 (t)->t_res_num = 0; \ 351 (t)->t_res_arr_sum = 0; \ 352 } \ 353 (t)->t_res_arr[(t)->t_res_num].r_len = (len); \ 354 (t)->t_res_arr[(t)->t_res_num].r_type = (type); \ 355 (t)->t_res_arr_sum += (len); \ 356 (t)->t_res_num++; \ 357 } while (0) 358 359 /* 360 * Reservation region 361 * As would be stored in xfs_log_iovec but without the i_addr which 362 * we don't care about. 363 */ 364 typedef struct xlog_res { 365 uint r_len; 366 uint r_type; 367 } xlog_res_t; 368 #else 369 #define XLOG_TIC_RESET_RES(t) 370 #define XLOG_TIC_ADD_OPHDR(t) 371 #define XLOG_TIC_ADD_REGION(t, len, type) 372 #endif 373 374 375 typedef struct xlog_ticket { 376 sv_t t_sema; /* sleep on this semaphore : 20 */ 377 struct xlog_ticket *t_next; /* :4|8 */ 378 struct xlog_ticket *t_prev; /* :4|8 */ 379 xlog_tid_t t_tid; /* transaction identifier : 4 */ 380 int t_curr_res; /* current reservation in bytes : 4 */ 381 int t_unit_res; /* unit reservation in bytes : 4 */ 382 char t_ocnt; /* original count : 1 */ 383 char t_cnt; /* current count : 1 */ 384 char t_clientid; /* who does this belong to; : 1 */ 385 char t_flags; /* properties of reservation : 1 */ 386 uint t_trans_type; /* transaction type : 4 */ 387 388 #if defined (XFS_LOG_RES_DEBUG) 389 /* reservation array fields */ 390 uint t_res_num; /* num in array : 4 */ 391 xlog_res_t t_res_arr[XLOG_TIC_LEN_MAX]; /* array of res : X */ 392 uint t_res_num_ophdrs; /* num op hdrs : 4 */ 393 uint t_res_arr_sum; /* array sum : 4 */ 394 uint t_res_o_flow; /* sum overflow : 4 */ 395 #endif 396 } xlog_ticket_t; 397 398 #endif 399 400 401 typedef struct xlog_op_header { 402 xlog_tid_t oh_tid; /* transaction id of operation : 4 b */ 403 int oh_len; /* bytes in data region : 4 b */ 404 __uint8_t oh_clientid; /* who sent me this : 1 b */ 405 __uint8_t oh_flags; /* : 1 b */ 406 ushort oh_res2; /* 32 bit align : 2 b */ 407 } xlog_op_header_t; 408 409 410 /* valid values for h_fmt */ 411 #define XLOG_FMT_UNKNOWN 0 412 #define XLOG_FMT_LINUX_LE 1 413 #define XLOG_FMT_LINUX_BE 2 414 #define XLOG_FMT_IRIX_BE 3 415 416 /* our fmt */ 417 #ifdef XFS_NATIVE_HOST 418 #define XLOG_FMT XLOG_FMT_LINUX_BE 419 #else 420 #define XLOG_FMT XLOG_FMT_LINUX_LE 421 #endif 422 423 typedef struct xlog_rec_header { 424 uint h_magicno; /* log record (LR) identifier : 4 */ 425 uint h_cycle; /* write cycle of log : 4 */ 426 int h_version; /* LR version : 4 */ 427 int h_len; /* len in bytes; should be 64-bit aligned: 4 */ 428 xfs_lsn_t h_lsn; /* lsn of this LR : 8 */ 429 xfs_lsn_t h_tail_lsn; /* lsn of 1st LR w/ buffers not committed: 8 */ 430 uint h_chksum; /* may not be used; non-zero if used : 4 */ 431 int h_prev_block; /* block number to previous LR : 4 */ 432 int h_num_logops; /* number of log operations in this LR : 4 */ 433 uint h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; 434 /* new fields */ 435 int h_fmt; /* format of log record : 4 */ 436 uuid_t h_fs_uuid; /* uuid of FS : 16 */ 437 int h_size; /* iclog size : 4 */ 438 } xlog_rec_header_t; 439 440 typedef struct xlog_rec_ext_header { 441 uint xh_cycle; /* write cycle of log : 4 */ 442 uint xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /* : 256 */ 443 } xlog_rec_ext_header_t; 444 445 #ifdef __KERNEL__ 446 /* 447 * - A log record header is 512 bytes. There is plenty of room to grow the 448 * xlog_rec_header_t into the reserved space. 449 * - ic_data follows, so a write to disk can start at the beginning of 450 * the iclog. 451 * - ic_forcesema is used to implement synchronous forcing of the iclog to disk. 452 * - ic_next is the pointer to the next iclog in the ring. 453 * - ic_bp is a pointer to the buffer used to write this incore log to disk. 454 * - ic_log is a pointer back to the global log structure. 455 * - ic_callback is a linked list of callback function/argument pairs to be 456 * called after an iclog finishes writing. 457 * - ic_size is the full size of the header plus data. 458 * - ic_offset is the current number of bytes written to in this iclog. 459 * - ic_refcnt is bumped when someone is writing to the log. 460 * - ic_state is the state of the iclog. 461 */ 462 typedef struct xlog_iclog_fields { 463 sv_t ic_forcesema; 464 sv_t ic_writesema; 465 struct xlog_in_core *ic_next; 466 struct xlog_in_core *ic_prev; 467 struct xfs_buf *ic_bp; 468 struct log *ic_log; 469 xfs_log_callback_t *ic_callback; 470 xfs_log_callback_t **ic_callback_tail; 471 #ifdef XFS_LOG_TRACE 472 struct ktrace *ic_trace; 473 #endif 474 int ic_size; 475 int ic_offset; 476 int ic_refcnt; 477 int ic_bwritecnt; 478 ushort_t ic_state; 479 char *ic_datap; /* pointer to iclog data */ 480 } xlog_iclog_fields_t; 481 482 typedef union xlog_in_core2 { 483 xlog_rec_header_t hic_header; 484 xlog_rec_ext_header_t hic_xheader; 485 char hic_sector[XLOG_HEADER_SIZE]; 486 } xlog_in_core_2_t; 487 488 typedef struct xlog_in_core { 489 xlog_iclog_fields_t hic_fields; 490 xlog_in_core_2_t *hic_data; 491 } xlog_in_core_t; 492 493 /* 494 * Defines to save our code from this glop. 495 */ 496 #define ic_forcesema hic_fields.ic_forcesema 497 #define ic_writesema hic_fields.ic_writesema 498 #define ic_next hic_fields.ic_next 499 #define ic_prev hic_fields.ic_prev 500 #define ic_bp hic_fields.ic_bp 501 #define ic_log hic_fields.ic_log 502 #define ic_callback hic_fields.ic_callback 503 #define ic_callback_tail hic_fields.ic_callback_tail 504 #define ic_trace hic_fields.ic_trace 505 #define ic_size hic_fields.ic_size 506 #define ic_offset hic_fields.ic_offset 507 #define ic_refcnt hic_fields.ic_refcnt 508 #define ic_bwritecnt hic_fields.ic_bwritecnt 509 #define ic_state hic_fields.ic_state 510 #define ic_datap hic_fields.ic_datap 511 #define ic_header hic_data->hic_header 512 513 /* 514 * The reservation head lsn is not made up of a cycle number and block number. 515 * Instead, it uses a cycle number and byte number. Logs don't expect to 516 * overflow 31 bits worth of byte offset, so using a byte number will mean 517 * that round off problems won't occur when releasing partial reservations. 518 */ 519 typedef struct log { 520 /* The following block of fields are changed while holding icloglock */ 521 sema_t l_flushsema; /* iclog flushing semaphore */ 522 int l_flushcnt; /* # of procs waiting on this 523 * sema */ 524 int l_ticket_cnt; /* free ticket count */ 525 int l_ticket_tcnt; /* total ticket count */ 526 int l_covered_state;/* state of "covering disk 527 * log entries" */ 528 xlog_ticket_t *l_freelist; /* free list of tickets */ 529 xlog_ticket_t *l_unmount_free;/* kmem_free these addresses */ 530 xlog_ticket_t *l_tail; /* free list of tickets */ 531 xlog_in_core_t *l_iclog; /* head log queue */ 532 lock_t l_icloglock; /* grab to change iclog state */ 533 xfs_lsn_t l_tail_lsn; /* lsn of 1st LR with unflushed 534 * buffers */ 535 xfs_lsn_t l_last_sync_lsn;/* lsn of last LR on disk */ 536 struct xfs_mount *l_mp; /* mount point */ 537 struct xfs_buf *l_xbuf; /* extra buffer for log 538 * wrapping */ 539 struct xfs_buftarg *l_targ; /* buftarg of log */ 540 xfs_daddr_t l_logBBstart; /* start block of log */ 541 int l_logsize; /* size of log in bytes */ 542 int l_logBBsize; /* size of log in BB chunks */ 543 int l_curr_cycle; /* Cycle number of log writes */ 544 int l_prev_cycle; /* Cycle number before last 545 * block increment */ 546 int l_curr_block; /* current logical log block */ 547 int l_prev_block; /* previous logical log block */ 548 int l_iclog_size; /* size of log in bytes */ 549 int l_iclog_size_log; /* log power size of log */ 550 int l_iclog_bufs; /* number of iclog buffers */ 551 552 /* The following field are used for debugging; need to hold icloglock */ 553 char *l_iclog_bak[XLOG_MAX_ICLOGS]; 554 555 /* The following block of fields are changed while holding grant_lock */ 556 lock_t l_grant_lock; 557 xlog_ticket_t *l_reserve_headq; 558 xlog_ticket_t *l_write_headq; 559 int l_grant_reserve_cycle; 560 int l_grant_reserve_bytes; 561 int l_grant_write_cycle; 562 int l_grant_write_bytes; 563 564 /* The following fields don't need locking */ 565 #ifdef XFS_LOG_TRACE 566 struct ktrace *l_trace; 567 struct ktrace *l_grant_trace; 568 #endif 569 uint l_flags; 570 uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */ 571 struct xfs_buf_cancel **l_buf_cancel_table; 572 int l_iclog_hsize; /* size of iclog header */ 573 int l_iclog_heads; /* # of iclog header sectors */ 574 uint l_sectbb_log; /* log2 of sector size in BBs */ 575 uint l_sectbb_mask; /* sector size (in BBs) 576 * alignment mask */ 577 } xlog_t; 578 579 580 /* common routines */ 581 extern xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp); 582 extern int xlog_find_tail(xlog_t *log, 583 xfs_daddr_t *head_blk, 584 xfs_daddr_t *tail_blk, 585 int readonly); 586 extern int xlog_recover(xlog_t *log, int readonly); 587 extern int xlog_recover_finish(xlog_t *log, int mfsi_flags); 588 extern void xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int); 589 extern void xlog_recover_process_iunlinks(xlog_t *log); 590 591 extern struct xfs_buf *xlog_get_bp(xlog_t *, int); 592 extern void xlog_put_bp(struct xfs_buf *); 593 extern int xlog_bread(xlog_t *, xfs_daddr_t, int, struct xfs_buf *); 594 595 /* iclog tracing */ 596 #define XLOG_TRACE_GRAB_FLUSH 1 597 #define XLOG_TRACE_REL_FLUSH 2 598 #define XLOG_TRACE_SLEEP_FLUSH 3 599 #define XLOG_TRACE_WAKE_FLUSH 4 600 601 #endif /* __KERNEL__ */ 602 603 #endif /* __XFS_LOG_PRIV_H__ */ 604