fs/xfs/xfs_log_priv.h

   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 #if __BYTE_ORDER == __LITTLE_ENDIAN
 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 typedef struct xlog_ticket {
 339         sv_t               t_sema;       /* sleep on this semaphore      :20 */
 340         struct xlog_ticket *t_next;      /*                              : 4 */
 341         struct xlog_ticket *t_prev;      /*                              : 4 */
 342         xlog_tid_t         t_tid;        /* transaction identifier       : 4 */
 343         int                t_curr_res;   /* current reservation in bytes : 4 */
 344         int                t_unit_res;   /* unit reservation in bytes    : 4 */
 345         __uint8_t          t_ocnt;       /* original count               : 1 */
 346         __uint8_t          t_cnt;        /* current count                : 1 */
 347         __uint8_t          t_clientid;   /* who does this belong to;     : 1 */
 348         __uint8_t          t_flags;      /* properties of reservation    : 1 */
 349 } xlog_ticket_t;
 350 #endif
 351
 352
 353 typedef struct xlog_op_header {
 354         xlog_tid_t oh_tid;      /* transaction id of operation  :  4 b */
 355         int        oh_len;      /* bytes in data region         :  4 b */
 356         __uint8_t  oh_clientid; /* who sent me this             :  1 b */
 357         __uint8_t  oh_flags;    /*                              :  1 b */
 358         ushort     oh_res2;     /* 32 bit align                 :  2 b */
 359 } xlog_op_header_t;
 360
 361
 362 /* valid values for h_fmt */
 363 #define XLOG_FMT_UNKNOWN  0
 364 #define XLOG_FMT_LINUX_LE 1
 365 #define XLOG_FMT_LINUX_BE 2
 366 #define XLOG_FMT_IRIX_BE  3
 367
 368 /* our fmt */
 369 #if __BYTE_ORDER == __LITTLE_ENDIAN
 370 #define XLOG_FMT XLOG_FMT_LINUX_LE
 371 #else
 372 #if __BYTE_ORDER == __BIG_ENDIAN
 373 #define XLOG_FMT XLOG_FMT_LINUX_BE
 374 #else
 375 #error unknown byte order
 376 #endif
 377 #endif
 378
 379 typedef struct xlog_rec_header {
 380         uint      h_magicno;    /* log record (LR) identifier           :  4 */
 381         uint      h_cycle;      /* write cycle of log                   :  4 */
 382         int       h_version;    /* LR version                           :  4 */
 383         int       h_len;        /* len in bytes; should be 64-bit aligned: 4 */
 384         xfs_lsn_t h_lsn;        /* lsn of this LR                       :  8 */
 385         xfs_lsn_t h_tail_lsn;   /* lsn of 1st LR w/ buffers not committed: 8 */
 386         uint      h_chksum;     /* may not be used; non-zero if used    :  4 */
 387         int       h_prev_block; /* block number to previous LR          :  4 */
 388         int       h_num_logops; /* number of log operations in this LR  :  4 */
 389         uint      h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE];
 390         /* new fields */
 391         int       h_fmt;        /* format of log record                 :  4 */
 392         uuid_t    h_fs_uuid;    /* uuid of FS                           : 16 */
 393         int       h_size;       /* iclog size                           :  4 */
 394 } xlog_rec_header_t;
 395
 396 typedef struct xlog_rec_ext_header {
 397         uint      xh_cycle;     /* write cycle of log                   : 4 */
 398         uint      xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /*    : 256 */
 399 } xlog_rec_ext_header_t;
 400
 401 #ifdef __KERNEL__
 402 /*
 403  * - A log record header is 512 bytes.  There is plenty of room to grow the
 404  *      xlog_rec_header_t into the reserved space.
 405  * - ic_data follows, so a write to disk can start at the beginning of
 406  *      the iclog.
 407  * - ic_forcesema is used to implement synchronous forcing of the iclog to disk.
 408  * - ic_next is the pointer to the next iclog in the ring.
 409  * - ic_bp is a pointer to the buffer used to write this incore log to disk.
 410  * - ic_log is a pointer back to the global log structure.
 411  * - ic_callback is a linked list of callback function/argument pairs to be
 412  *      called after an iclog finishes writing.
 413  * - ic_size is the full size of the header plus data.
 414  * - ic_offset is the current number of bytes written to in this iclog.
 415  * - ic_refcnt is bumped when someone is writing to the log.
 416  * - ic_state is the state of the iclog.
 417  */
 418 typedef struct xlog_iclog_fields {
 419         sv_t                    ic_forcesema;
 420         sv_t                    ic_writesema;
 421         struct xlog_in_core     *ic_next;
 422         struct xlog_in_core     *ic_prev;
 423         struct xfs_buf          *ic_bp;
 424         struct log              *ic_log;
 425         xfs_log_callback_t      *ic_callback;
 426         xfs_log_callback_t      **ic_callback_tail;
 427 #ifdef XFS_LOG_TRACE
 428         struct ktrace           *ic_trace;
 429 #endif
 430         int                     ic_size;
 431         int                     ic_offset;
 432         int                     ic_refcnt;
 433         int                     ic_bwritecnt;
 434         ushort_t                ic_state;
 435         char                    *ic_datap;      /* pointer to iclog data */
 436 } xlog_iclog_fields_t;
 437
 438 typedef union xlog_in_core2 {
 439         xlog_rec_header_t       hic_header;
 440         xlog_rec_ext_header_t   hic_xheader;
 441         char                    hic_sector[XLOG_HEADER_SIZE];
 442 } xlog_in_core_2_t;
 443
 444 typedef struct xlog_in_core {
 445         xlog_iclog_fields_t     hic_fields;
 446         xlog_in_core_2_t        *hic_data;
 447 } xlog_in_core_t;
 448
 449 /*
 450  * Defines to save our code from this glop.
 451  */
 452 #define ic_forcesema    hic_fields.ic_forcesema
 453 #define ic_writesema    hic_fields.ic_writesema
 454 #define ic_next         hic_fields.ic_next
 455 #define ic_prev         hic_fields.ic_prev
 456 #define ic_bp           hic_fields.ic_bp
 457 #define ic_log          hic_fields.ic_log
 458 #define ic_callback     hic_fields.ic_callback
 459 #define ic_callback_tail hic_fields.ic_callback_tail
 460 #define ic_trace        hic_fields.ic_trace
 461 #define ic_size         hic_fields.ic_size
 462 #define ic_offset       hic_fields.ic_offset
 463 #define ic_refcnt       hic_fields.ic_refcnt
 464 #define ic_bwritecnt    hic_fields.ic_bwritecnt
 465 #define ic_state        hic_fields.ic_state
 466 #define ic_datap        hic_fields.ic_datap
 467 #define ic_header       hic_data->hic_header
 468
 469 /*
 470  * The reservation head lsn is not made up of a cycle number and block number.
 471  * Instead, it uses a cycle number and byte number.  Logs don't expect to
 472  * overflow 31 bits worth of byte offset, so using a byte number will mean
 473  * that round off problems won't occur when releasing partial reservations.
 474  */
 475 typedef struct log {
 476         /* The following block of fields are changed while holding icloglock */
 477         sema_t                  l_flushsema;    /* iclog flushing semaphore */
 478         int                     l_flushcnt;     /* # of procs waiting on this
 479                                                  * sema */
 480         int                     l_ticket_cnt;   /* free ticket count */
 481         int                     l_ticket_tcnt;  /* total ticket count */
 482         int                     l_covered_state;/* state of "covering disk
 483                                                  * log entries" */
 484         xlog_ticket_t           *l_freelist;    /* free list of tickets */
 485         xlog_ticket_t           *l_unmount_free;/* kmem_free these addresses */
 486         xlog_ticket_t           *l_tail;        /* free list of tickets */
 487         xlog_in_core_t          *l_iclog;       /* head log queue       */
 488         lock_t                  l_icloglock;    /* grab to change iclog state */
 489         xfs_lsn_t               l_tail_lsn;     /* lsn of 1st LR with unflushed
 490                                                  * buffers */
 491         xfs_lsn_t               l_last_sync_lsn;/* lsn of last LR on disk */
 492         struct xfs_mount        *l_mp;          /* mount point */
 493         struct xfs_buf          *l_xbuf;        /* extra buffer for log
 494                                                  * wrapping */
 495         struct xfs_buftarg      *l_targ;        /* buftarg of log */
 496         xfs_daddr_t             l_logBBstart;   /* start block of log */
 497         int                     l_logsize;      /* size of log in bytes */
 498         int                     l_logBBsize;    /* size of log in BB chunks */
 499         int                     l_curr_cycle;   /* Cycle number of log writes */
 500         int                     l_prev_cycle;   /* Cycle number before last
 501                                                  * block increment */
 502         int                     l_curr_block;   /* current logical log block */
 503         int                     l_prev_block;   /* previous logical log block */
 504         int                     l_iclog_size;   /* size of log in bytes */
 505         int                     l_iclog_size_log; /* log power size of log */
 506         int                     l_iclog_bufs;   /* number of iclog buffers */
 507
 508         /* The following field are used for debugging; need to hold icloglock */
 509         char                    *l_iclog_bak[XLOG_MAX_ICLOGS];
 510
 511         /* The following block of fields are changed while holding grant_lock */
 512         lock_t                  l_grant_lock;
 513         xlog_ticket_t           *l_reserve_headq;
 514         xlog_ticket_t           *l_write_headq;
 515         int                     l_grant_reserve_cycle;
 516         int                     l_grant_reserve_bytes;
 517         int                     l_grant_write_cycle;
 518         int                     l_grant_write_bytes;
 519
 520         /* The following fields don't need locking */
 521 #ifdef XFS_LOG_TRACE
 522         struct ktrace           *l_trace;
 523         struct ktrace           *l_grant_trace;
 524 #endif
 525         uint                    l_flags;
 526         uint                    l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */
 527         struct xfs_buf_cancel   **l_buf_cancel_table;
 528         int                     l_iclog_hsize;  /* size of iclog header */
 529         int                     l_iclog_heads;  /* # of iclog header sectors */
 530         uint                    l_sectbb_log;   /* log2 of sector size in BBs */
 531         uint                    l_sectbb_mask;  /* sector size (in BBs)
 532                                                  * alignment mask */
 533 } xlog_t;
 534
 535
 536 /* common routines */
 537 extern xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
 538 extern int       xlog_find_head(xlog_t *log, xfs_daddr_t *head_blk);
 539 extern int       xlog_find_tail(xlog_t  *log,
 540                                 xfs_daddr_t *head_blk,
 541                                 xfs_daddr_t *tail_blk,
 542                                 int readonly);
 543 extern int       xlog_recover(xlog_t *log, int readonly);
 544 extern int       xlog_recover_finish(xlog_t *log, int mfsi_flags);
 545 extern void      xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int);
 546 extern void      xlog_recover_process_iunlinks(xlog_t *log);
 547
 548 extern struct xfs_buf *xlog_get_bp(xlog_t *, int);
 549 extern void      xlog_put_bp(struct xfs_buf *);
 550 extern int       xlog_bread(xlog_t *, xfs_daddr_t, int, struct xfs_buf *);
 551 extern xfs_caddr_t xlog_align(xlog_t *, xfs_daddr_t, int, struct xfs_buf *);
 552
 553 /* iclog tracing */
 554 #define XLOG_TRACE_GRAB_FLUSH  1
 555 #define XLOG_TRACE_REL_FLUSH   2
 556 #define XLOG_TRACE_SLEEP_FLUSH 3
 557 #define XLOG_TRACE_WAKE_FLUSH  4
 558
 559 #endif  /* __KERNEL__ */
 560
 561 #endif  /* __XFS_LOG_PRIV_H__ */