fs/xfs/xfs_log_priv.h

   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__ */