1 /* 2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * 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. 13 * 14 * 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 17 */ 18 #ifndef __XFS_LOG_PRIV_H__ 19 #define __XFS_LOG_PRIV_H__ 20 21 struct xfs_buf; 22 struct ktrace; 23 struct log; 24 struct xlog_ticket; 25 struct xfs_buf_cancel; 26 struct xfs_mount; 27 28 /* 29 * Macros, structures, prototypes for internal log manager use. 30 */ 31 32 #define XLOG_MIN_ICLOGS 2 33 #define XLOG_MED_ICLOGS 4 34 #define XLOG_MAX_ICLOGS 8 35 #define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */ 36 #define XLOG_VERSION_1 1 37 #define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */ 38 #define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2) 39 #define XLOG_RECORD_BSIZE (16*1024) /* eventually 32k */ 40 #define XLOG_BIG_RECORD_BSIZE (32*1024) /* 32k buffers */ 41 #define XLOG_MAX_RECORD_BSIZE (256*1024) 42 #define XLOG_HEADER_CYCLE_SIZE (32*1024) /* cycle data in header */ 43 #define XLOG_RECORD_BSHIFT 14 /* 16384 == 1 << 14 */ 44 #define XLOG_BIG_RECORD_BSHIFT 15 /* 32k == 1 << 15 */ 45 #define XLOG_MAX_RECORD_BSHIFT 18 /* 256k == 1 << 18 */ 46 #define XLOG_BTOLSUNIT(log, b) (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \ 47 (log)->l_mp->m_sb.sb_logsunit) 48 #define XLOG_LSUNITTOB(log, su) ((su) * (log)->l_mp->m_sb.sb_logsunit) 49 50 #define XLOG_HEADER_SIZE 512 51 52 #define XLOG_REC_SHIFT(log) \ 53 BTOBB(1 << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \ 54 XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) 55 #define XLOG_TOTAL_REC_SHIFT(log) \ 56 BTOBB(XLOG_MAX_ICLOGS << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \ 57 XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) 58 59 /* 60 * set lsns 61 */ 62 63 #define ASSIGN_ANY_LSN_HOST(lsn,cycle,block) \ 64 { \ 65 (lsn) = ((xfs_lsn_t)(cycle)<<32)|(block); \ 66 } 67 #define ASSIGN_ANY_LSN_DISK(lsn,cycle,block) \ 68 { \ 69 INT_SET(((uint *)&(lsn))[0], ARCH_CONVERT, (cycle)); \ 70 INT_SET(((uint *)&(lsn))[1], ARCH_CONVERT, (block)); \ 71 } 72 #define ASSIGN_LSN(lsn,log) \ 73 ASSIGN_ANY_LSN_DISK(lsn,(log)->l_curr_cycle,(log)->l_curr_block); 74 75 #define XLOG_SET(f,b) (((f) & (b)) == (b)) 76 77 #define GET_CYCLE(ptr, arch) \ 78 (INT_GET(*(uint *)(ptr), arch) == XLOG_HEADER_MAGIC_NUM ? \ 79 INT_GET(*((uint *)(ptr)+1), arch) : \ 80 INT_GET(*(uint *)(ptr), arch) \ 81 ) 82 83 #define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1) 84 85 86 #ifdef __KERNEL__ 87 88 /* 89 * get client id from packed copy. 90 * 91 * this hack is here because the xlog_pack code copies four bytes 92 * of xlog_op_header containing the fields oh_clientid, oh_flags 93 * and oh_res2 into the packed copy. 94 * 95 * later on this four byte chunk is treated as an int and the 96 * client id is pulled out. 97 * 98 * this has endian issues, of course. 99 */ 100 101 #ifndef XFS_NATIVE_HOST 102 #define GET_CLIENT_ID(i,arch) \ 103 ((i) & 0xff) 104 #else 105 #define GET_CLIENT_ID(i,arch) \ 106 ((i) >> 24) 107 #endif 108 109 #define GRANT_LOCK(log) mutex_spinlock(&(log)->l_grant_lock) 110 #define GRANT_UNLOCK(log, s) mutex_spinunlock(&(log)->l_grant_lock, s) 111 #define LOG_LOCK(log) mutex_spinlock(&(log)->l_icloglock) 112 #define LOG_UNLOCK(log, s) mutex_spinunlock(&(log)->l_icloglock, s) 113 114 #define xlog_panic(args...) cmn_err(CE_PANIC, ## args) 115 #define xlog_exit(args...) cmn_err(CE_PANIC, ## args) 116 #define xlog_warn(args...) cmn_err(CE_WARN, ## args) 117 118 /* 119 * In core log state 120 */ 121 #define XLOG_STATE_ACTIVE 0x0001 /* Current IC log being written to */ 122 #define XLOG_STATE_WANT_SYNC 0x0002 /* Want to sync this iclog; no more writes */ 123 #define XLOG_STATE_SYNCING 0x0004 /* This IC log is syncing */ 124 #define XLOG_STATE_DONE_SYNC 0x0008 /* Done syncing to disk */ 125 #define XLOG_STATE_DO_CALLBACK \ 126 0x0010 /* Process callback functions */ 127 #define XLOG_STATE_CALLBACK 0x0020 /* Callback functions now */ 128 #define XLOG_STATE_DIRTY 0x0040 /* Dirty IC log, not ready for ACTIVE status*/ 129 #define XLOG_STATE_IOERROR 0x0080 /* IO error happened in sync'ing log */ 130 #define XLOG_STATE_ALL 0x7FFF /* All possible valid flags */ 131 #define XLOG_STATE_NOTUSED 0x8000 /* This IC log not being used */ 132 #endif /* __KERNEL__ */ 133 134 /* 135 * Flags to log operation header 136 * 137 * The first write of a new transaction will be preceded with a start 138 * record, XLOG_START_TRANS. Once a transaction is committed, a commit 139 * record is written, XLOG_COMMIT_TRANS. If a single region can not fit into 140 * the remainder of the current active in-core log, it is split up into 141 * multiple regions. Each partial region will be marked with a 142 * XLOG_CONTINUE_TRANS until the last one, which gets marked with XLOG_END_TRANS. 143 * 144 */ 145 #define XLOG_START_TRANS 0x01 /* Start a new transaction */ 146 #define XLOG_COMMIT_TRANS 0x02 /* Commit this transaction */ 147 #define XLOG_CONTINUE_TRANS 0x04 /* Cont this trans into new region */ 148 #define XLOG_WAS_CONT_TRANS 0x08 /* Cont this trans into new region */ 149 #define XLOG_END_TRANS 0x10 /* End a continued transaction */ 150 #define XLOG_UNMOUNT_TRANS 0x20 /* Unmount a filesystem transaction */ 151 152 #ifdef __KERNEL__ 153 /* 154 * Flags to log ticket 155 */ 156 #define XLOG_TIC_INITED 0x1 /* has been initialized */ 157 #define XLOG_TIC_PERM_RESERV 0x2 /* permanent reservation */ 158 #define XLOG_TIC_IN_Q 0x4 159 #endif /* __KERNEL__ */ 160 161 #define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */ 162 163 /* 164 * Flags for log structure 165 */ 166 #define XLOG_CHKSUM_MISMATCH 0x1 /* used only during recovery */ 167 #define XLOG_ACTIVE_RECOVERY 0x2 /* in the middle of recovery */ 168 #define XLOG_RECOVERY_NEEDED 0x4 /* log was recovered */ 169 #define XLOG_IO_ERROR 0x8 /* log hit an I/O error, and being 170 shutdown */ 171 typedef __uint32_t xlog_tid_t; 172 173 174 #ifdef __KERNEL__ 175 /* 176 * Below are states for covering allocation transactions. 177 * By covering, we mean changing the h_tail_lsn in the last on-disk 178 * log write such that no allocation transactions will be re-done during 179 * recovery after a system crash. Recovery starts at the last on-disk 180 * log write. 181 * 182 * These states are used to insert dummy log entries to cover 183 * space allocation transactions which can undo non-transactional changes 184 * after a crash. Writes to a file with space 185 * already allocated do not result in any transactions. Allocations 186 * might include space beyond the EOF. So if we just push the EOF a 187 * little, the last transaction for the file could contain the wrong 188 * size. If there is no file system activity, after an allocation 189 * transaction, and the system crashes, the allocation transaction 190 * will get replayed and the file will be truncated. This could 191 * be hours/days/... after the allocation occurred. 192 * 193 * The fix for this is to do two dummy transactions when the 194 * system is idle. We need two dummy transaction because the h_tail_lsn 195 * in the log record header needs to point beyond the last possible 196 * non-dummy transaction. The first dummy changes the h_tail_lsn to 197 * the first transaction before the dummy. The second dummy causes 198 * h_tail_lsn to point to the first dummy. Recovery starts at h_tail_lsn. 199 * 200 * These dummy transactions get committed when everything 201 * is idle (after there has been some activity). 202 * 203 * There are 5 states used to control this. 204 * 205 * IDLE -- no logging has been done on the file system or 206 * we are done covering previous transactions. 207 * NEED -- logging has occurred and we need a dummy transaction 208 * when the log becomes idle. 209 * DONE -- we were in the NEED state and have committed a dummy 210 * transaction. 211 * NEED2 -- we detected that a dummy transaction has gone to the 212 * on disk log with no other transactions. 213 * DONE2 -- we committed a dummy transaction when in the NEED2 state. 214 * 215 * There are two places where we switch states: 216 * 217 * 1.) In xfs_sync, when we detect an idle log and are in NEED or NEED2. 218 * We commit the dummy transaction and switch to DONE or DONE2, 219 * respectively. In all other states, we don't do anything. 220 * 221 * 2.) When we finish writing the on-disk log (xlog_state_clean_log). 222 * 223 * No matter what state we are in, if this isn't the dummy 224 * transaction going out, the next state is NEED. 225 * So, if we aren't in the DONE or DONE2 states, the next state 226 * is NEED. We can't be finishing a write of the dummy record 227 * unless it was committed and the state switched to DONE or DONE2. 228 * 229 * If we are in the DONE state and this was a write of the 230 * dummy transaction, we move to NEED2. 231 * 232 * If we are in the DONE2 state and this was a write of the 233 * dummy transaction, we move to IDLE. 234 * 235 * 236 * Writing only one dummy transaction can get appended to 237 * one file space allocation. When this happens, the log recovery 238 * code replays the space allocation and a file could be truncated. 239 * This is why we have the NEED2 and DONE2 states before going idle. 240 */ 241 242 #define XLOG_STATE_COVER_IDLE 0 243 #define XLOG_STATE_COVER_NEED 1 244 #define XLOG_STATE_COVER_DONE 2 245 #define XLOG_STATE_COVER_NEED2 3 246 #define XLOG_STATE_COVER_DONE2 4 247 248 #define XLOG_COVER_OPS 5 249 250 251 /* Ticket reservation region accounting */ 252 #define XLOG_TIC_LEN_MAX 15 253 #define XLOG_TIC_RESET_RES(t) ((t)->t_res_num = \ 254 (t)->t_res_arr_sum = (t)->t_res_num_ophdrs = 0) 255 #define XLOG_TIC_ADD_OPHDR(t) ((t)->t_res_num_ophdrs++) 256 #define XLOG_TIC_ADD_REGION(t, len, type) \ 257 do { \ 258 if ((t)->t_res_num == XLOG_TIC_LEN_MAX) { \ 259 /* add to overflow and start again */ \ 260 (t)->t_res_o_flow += (t)->t_res_arr_sum; \ 261 (t)->t_res_num = 0; \ 262 (t)->t_res_arr_sum = 0; \ 263 } \ 264 (t)->t_res_arr[(t)->t_res_num].r_len = (len); \ 265 (t)->t_res_arr[(t)->t_res_num].r_type = (type); \ 266 (t)->t_res_arr_sum += (len); \ 267 (t)->t_res_num++; \ 268 } while (0) 269 270 /* 271 * Reservation region 272 * As would be stored in xfs_log_iovec but without the i_addr which 273 * we don't care about. 274 */ 275 typedef struct xlog_res { 276 uint r_len; /* region length :4 */ 277 uint r_type; /* region's transaction type :4 */ 278 } xlog_res_t; 279 280 typedef struct xlog_ticket { 281 sv_t t_sema; /* sleep on this semaphore : 20 */ 282 struct xlog_ticket *t_next; /* :4|8 */ 283 struct xlog_ticket *t_prev; /* :4|8 */ 284 xlog_tid_t t_tid; /* transaction identifier : 4 */ 285 int t_curr_res; /* current reservation in bytes : 4 */ 286 int t_unit_res; /* unit reservation in bytes : 4 */ 287 char t_ocnt; /* original count : 1 */ 288 char t_cnt; /* current count : 1 */ 289 char t_clientid; /* who does this belong to; : 1 */ 290 char t_flags; /* properties of reservation : 1 */ 291 uint t_trans_type; /* transaction type : 4 */ 292 293 /* reservation array fields */ 294 uint t_res_num; /* num in array : 4 */ 295 uint t_res_num_ophdrs; /* num op hdrs : 4 */ 296 uint t_res_arr_sum; /* array sum : 4 */ 297 uint t_res_o_flow; /* sum overflow : 4 */ 298 xlog_res_t t_res_arr[XLOG_TIC_LEN_MAX]; /* array of res : 8 * 15 */ 299 } xlog_ticket_t; 300 301 #endif 302 303 304 typedef struct xlog_op_header { 305 xlog_tid_t oh_tid; /* transaction id of operation : 4 b */ 306 int oh_len; /* bytes in data region : 4 b */ 307 __uint8_t oh_clientid; /* who sent me this : 1 b */ 308 __uint8_t oh_flags; /* : 1 b */ 309 ushort oh_res2; /* 32 bit align : 2 b */ 310 } xlog_op_header_t; 311 312 313 /* valid values for h_fmt */ 314 #define XLOG_FMT_UNKNOWN 0 315 #define XLOG_FMT_LINUX_LE 1 316 #define XLOG_FMT_LINUX_BE 2 317 #define XLOG_FMT_IRIX_BE 3 318 319 /* our fmt */ 320 #ifdef XFS_NATIVE_HOST 321 #define XLOG_FMT XLOG_FMT_LINUX_BE 322 #else 323 #define XLOG_FMT XLOG_FMT_LINUX_LE 324 #endif 325 326 typedef struct xlog_rec_header { 327 uint h_magicno; /* log record (LR) identifier : 4 */ 328 uint h_cycle; /* write cycle of log : 4 */ 329 int h_version; /* LR version : 4 */ 330 int h_len; /* len in bytes; should be 64-bit aligned: 4 */ 331 xfs_lsn_t h_lsn; /* lsn of this LR : 8 */ 332 xfs_lsn_t h_tail_lsn; /* lsn of 1st LR w/ buffers not committed: 8 */ 333 uint h_chksum; /* may not be used; non-zero if used : 4 */ 334 int h_prev_block; /* block number to previous LR : 4 */ 335 int h_num_logops; /* number of log operations in this LR : 4 */ 336 uint h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; 337 /* new fields */ 338 int h_fmt; /* format of log record : 4 */ 339 uuid_t h_fs_uuid; /* uuid of FS : 16 */ 340 int h_size; /* iclog size : 4 */ 341 } xlog_rec_header_t; 342 343 typedef struct xlog_rec_ext_header { 344 uint xh_cycle; /* write cycle of log : 4 */ 345 uint xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /* : 256 */ 346 } xlog_rec_ext_header_t; 347 348 #ifdef __KERNEL__ 349 /* 350 * - A log record header is 512 bytes. There is plenty of room to grow the 351 * xlog_rec_header_t into the reserved space. 352 * - ic_data follows, so a write to disk can start at the beginning of 353 * the iclog. 354 * - ic_forcesema is used to implement synchronous forcing of the iclog to disk. 355 * - ic_next is the pointer to the next iclog in the ring. 356 * - ic_bp is a pointer to the buffer used to write this incore log to disk. 357 * - ic_log is a pointer back to the global log structure. 358 * - ic_callback is a linked list of callback function/argument pairs to be 359 * called after an iclog finishes writing. 360 * - ic_size is the full size of the header plus data. 361 * - ic_offset is the current number of bytes written to in this iclog. 362 * - ic_refcnt is bumped when someone is writing to the log. 363 * - ic_state is the state of the iclog. 364 */ 365 typedef struct xlog_iclog_fields { 366 sv_t ic_forcesema; 367 sv_t ic_writesema; 368 struct xlog_in_core *ic_next; 369 struct xlog_in_core *ic_prev; 370 struct xfs_buf *ic_bp; 371 struct log *ic_log; 372 xfs_log_callback_t *ic_callback; 373 xfs_log_callback_t **ic_callback_tail; 374 #ifdef XFS_LOG_TRACE 375 struct ktrace *ic_trace; 376 #endif 377 int ic_size; 378 int ic_offset; 379 int ic_refcnt; 380 int ic_bwritecnt; 381 ushort_t ic_state; 382 char *ic_datap; /* pointer to iclog data */ 383 } xlog_iclog_fields_t; 384 385 typedef union xlog_in_core2 { 386 xlog_rec_header_t hic_header; 387 xlog_rec_ext_header_t hic_xheader; 388 char hic_sector[XLOG_HEADER_SIZE]; 389 } xlog_in_core_2_t; 390 391 typedef struct xlog_in_core { 392 xlog_iclog_fields_t hic_fields; 393 xlog_in_core_2_t *hic_data; 394 } xlog_in_core_t; 395 396 /* 397 * Defines to save our code from this glop. 398 */ 399 #define ic_forcesema hic_fields.ic_forcesema 400 #define ic_writesema hic_fields.ic_writesema 401 #define ic_next hic_fields.ic_next 402 #define ic_prev hic_fields.ic_prev 403 #define ic_bp hic_fields.ic_bp 404 #define ic_log hic_fields.ic_log 405 #define ic_callback hic_fields.ic_callback 406 #define ic_callback_tail hic_fields.ic_callback_tail 407 #define ic_trace hic_fields.ic_trace 408 #define ic_size hic_fields.ic_size 409 #define ic_offset hic_fields.ic_offset 410 #define ic_refcnt hic_fields.ic_refcnt 411 #define ic_bwritecnt hic_fields.ic_bwritecnt 412 #define ic_state hic_fields.ic_state 413 #define ic_datap hic_fields.ic_datap 414 #define ic_header hic_data->hic_header 415 416 /* 417 * The reservation head lsn is not made up of a cycle number and block number. 418 * Instead, it uses a cycle number and byte number. Logs don't expect to 419 * overflow 31 bits worth of byte offset, so using a byte number will mean 420 * that round off problems won't occur when releasing partial reservations. 421 */ 422 typedef struct log { 423 /* The following block of fields are changed while holding icloglock */ 424 sema_t l_flushsema; /* iclog flushing semaphore */ 425 int l_flushcnt; /* # of procs waiting on this 426 * sema */ 427 int l_ticket_cnt; /* free ticket count */ 428 int l_ticket_tcnt; /* total ticket count */ 429 int l_covered_state;/* state of "covering disk 430 * log entries" */ 431 xlog_ticket_t *l_freelist; /* free list of tickets */ 432 xlog_ticket_t *l_unmount_free;/* kmem_free these addresses */ 433 xlog_ticket_t *l_tail; /* free list of tickets */ 434 xlog_in_core_t *l_iclog; /* head log queue */ 435 lock_t l_icloglock; /* grab to change iclog state */ 436 xfs_lsn_t l_tail_lsn; /* lsn of 1st LR with unflushed 437 * buffers */ 438 xfs_lsn_t l_last_sync_lsn;/* lsn of last LR on disk */ 439 struct xfs_mount *l_mp; /* mount point */ 440 struct xfs_buf *l_xbuf; /* extra buffer for log 441 * wrapping */ 442 struct xfs_buftarg *l_targ; /* buftarg of log */ 443 xfs_daddr_t l_logBBstart; /* start block of log */ 444 int l_logsize; /* size of log in bytes */ 445 int l_logBBsize; /* size of log in BB chunks */ 446 int l_curr_cycle; /* Cycle number of log writes */ 447 int l_prev_cycle; /* Cycle number before last 448 * block increment */ 449 int l_curr_block; /* current logical log block */ 450 int l_prev_block; /* previous logical log block */ 451 int l_iclog_size; /* size of log in bytes */ 452 int l_iclog_size_log; /* log power size of log */ 453 int l_iclog_bufs; /* number of iclog buffers */ 454 455 /* The following field are used for debugging; need to hold icloglock */ 456 char *l_iclog_bak[XLOG_MAX_ICLOGS]; 457 458 /* The following block of fields are changed while holding grant_lock */ 459 lock_t l_grant_lock; 460 xlog_ticket_t *l_reserve_headq; 461 xlog_ticket_t *l_write_headq; 462 int l_grant_reserve_cycle; 463 int l_grant_reserve_bytes; 464 int l_grant_write_cycle; 465 int l_grant_write_bytes; 466 467 /* The following fields don't need locking */ 468 #ifdef XFS_LOG_TRACE 469 struct ktrace *l_trace; 470 struct ktrace *l_grant_trace; 471 #endif 472 uint l_flags; 473 uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */ 474 struct xfs_buf_cancel **l_buf_cancel_table; 475 int l_iclog_hsize; /* size of iclog header */ 476 int l_iclog_heads; /* # of iclog header sectors */ 477 uint l_sectbb_log; /* log2 of sector size in BBs */ 478 uint l_sectbb_mask; /* sector size (in BBs) 479 * alignment mask */ 480 } xlog_t; 481 482 #define XLOG_FORCED_SHUTDOWN(log) ((log)->l_flags & XLOG_IO_ERROR) 483 484 485 /* common routines */ 486 extern xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp); 487 extern int xlog_find_tail(xlog_t *log, 488 xfs_daddr_t *head_blk, 489 xfs_daddr_t *tail_blk); 490 extern int xlog_recover(xlog_t *log); 491 extern int xlog_recover_finish(xlog_t *log, int mfsi_flags); 492 extern void xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int); 493 extern void xlog_recover_process_iunlinks(xlog_t *log); 494 495 extern struct xfs_buf *xlog_get_bp(xlog_t *, int); 496 extern void xlog_put_bp(struct xfs_buf *); 497 extern int xlog_bread(xlog_t *, xfs_daddr_t, int, struct xfs_buf *); 498 499 /* iclog tracing */ 500 #define XLOG_TRACE_GRAB_FLUSH 1 501 #define XLOG_TRACE_REL_FLUSH 2 502 #define XLOG_TRACE_SLEEP_FLUSH 3 503 #define XLOG_TRACE_WAKE_FLUSH 4 504 505 /* 506 * Unmount record type is used as a pseudo transaction type for the ticket. 507 * It's value must be outside the range of XFS_TRANS_* values. 508 */ 509 #define XLOG_UNMOUNT_REC_TYPE (-1U) 510 511 #endif /* __KERNEL__ */ 512 513 #endif /* __XFS_LOG_PRIV_H__ */ 514