FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/zil.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    /*
     * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
     */
    
    /* Portions Copyright 2010 Robert Milkowski */
    
    #ifndef _SYS_ZIL_H
    #define _SYS_ZIL_H
    
    #include <sys/types.h>
    #include <sys/spa.h>
    #include <sys/zio.h>
    #include <sys/dmu.h>
    #include <sys/zio_crypt.h>
    #include <sys/wmsum.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    struct dsl_pool;
    struct dsl_dataset;
    struct lwb;
    
    /*
     * Intent log format:
     *
     * Each objset has its own intent log.  The log header (zil_header_t)
     * for objset N's intent log is kept in the Nth object of the SPA's
     * intent_log objset.  The log header points to a chain of log blocks,
     * each of which contains log records (i.e., transactions) followed by
     * a log block trailer (zil_trailer_t).  The format of a log record
     * depends on the record (or transaction) type, but all records begin
     * with a common structure that defines the type, length, and txg.
     */
    
    /*
     * Intent log header - this on disk structure holds fields to manage
     * the log.  All fields are 64 bit to easily handle cross architectures.
     */
    typedef struct zil_header {
            uint64_t zh_claim_txg;  /* txg in which log blocks were claimed */
            uint64_t zh_replay_seq; /* highest replayed sequence number */
            blkptr_t zh_log;        /* log chain */
            uint64_t zh_claim_blk_seq; /* highest claimed block sequence number */
            uint64_t zh_flags;      /* header flags */
            uint64_t zh_claim_lr_seq; /* highest claimed lr sequence number */
            uint64_t zh_pad[3];
    } zil_header_t;
    
    /*
     * zh_flags bit settings
     */
    #define ZIL_REPLAY_NEEDED       0x1     /* replay needed - internal only */
    #define ZIL_CLAIM_LR_SEQ_VALID  0x2     /* zh_claim_lr_seq field is valid */
    
    /*
     * Log block chaining.
     *
     * Log blocks are chained together. Originally they were chained at the
     * end of the block. For performance reasons the chain was moved to the
     * beginning of the block which allows writes for only the data being used.
     * The older position is supported for backwards compatibility.
     *
     * The zio_eck_t contains a zec_cksum which for the intent log is
     * the sequence number of this log block. A seq of 0 is invalid.
     * The zec_cksum is checked by the SPA against the sequence
     * number passed in the blk_cksum field of the blkptr_t
     */
    typedef struct zil_chain {
            uint64_t zc_pad;
            blkptr_t zc_next_blk;   /* next block in chain */
            uint64_t zc_nused;      /* bytes in log block used */
            zio_eck_t zc_eck;       /* block trailer */
    } zil_chain_t;
    
    #define ZIL_MIN_BLKSZ   4096ULL
    
   /*
    * ziltest is by and large an ugly hack, but very useful in
    * checking replay without tedious work.
    * When running ziltest we want to keep all itx's and so maintain
    * a single list in the zl_itxg[] that uses a high txg: ZILTEST_TXG
    * We subtract TXG_CONCURRENT_STATES to allow for common code.
    */
   #define ZILTEST_TXG (UINT64_MAX - TXG_CONCURRENT_STATES)
   
   /*
    * The words of a log block checksum.
    */
   #define ZIL_ZC_GUID_0   0
   #define ZIL_ZC_GUID_1   1
   #define ZIL_ZC_OBJSET   2
   #define ZIL_ZC_SEQ      3
   
   typedef enum zil_create {
           Z_FILE,
           Z_DIR,
           Z_XATTRDIR,
   } zil_create_t;
   
   /*
    * size of xvattr log section.
    * its composed of lr_attr_t + xvattr bitmap + 2 64 bit timestamps
    * for create time and a single 64 bit integer for all of the attributes,
    * and 4 64 bit integers (32 bytes) for the scanstamp.
    *
    */
   
   #define ZIL_XVAT_SIZE(mapsize) \
           sizeof (lr_attr_t) + (sizeof (uint32_t) * (mapsize - 1)) + \
           (sizeof (uint64_t) * 7)
   
   /*
    * Size of ACL in log.  The ACE data is padded out to properly align
    * on 8 byte boundary.
    */
   
   #define ZIL_ACE_LENGTH(x)       (roundup(x, sizeof (uint64_t)))
   
   /*
    * Intent log transaction types and record structures
    */
   #define TX_COMMIT               0       /* Commit marker (no on-disk state) */
   #define TX_CREATE               1       /* Create file */
   #define TX_MKDIR                2       /* Make directory */
   #define TX_MKXATTR              3       /* Make XATTR directory */
   #define TX_SYMLINK              4       /* Create symbolic link to a file */
   #define TX_REMOVE               5       /* Remove file */
   #define TX_RMDIR                6       /* Remove directory */
   #define TX_LINK                 7       /* Create hard link to a file */
   #define TX_RENAME               8       /* Rename a file */
   #define TX_WRITE                9       /* File write */
   #define TX_TRUNCATE             10      /* Truncate a file */
   #define TX_SETATTR              11      /* Set file attributes */
   #define TX_ACL_V0               12      /* Set old formatted ACL */
   #define TX_ACL                  13      /* Set ACL */
   #define TX_CREATE_ACL           14      /* create with ACL */
   #define TX_CREATE_ATTR          15      /* create + attrs */
   #define TX_CREATE_ACL_ATTR      16      /* create with ACL + attrs */
   #define TX_MKDIR_ACL            17      /* mkdir with ACL */
   #define TX_MKDIR_ATTR           18      /* mkdir with attr */
   #define TX_MKDIR_ACL_ATTR       19      /* mkdir with ACL + attrs */
   #define TX_WRITE2               20      /* dmu_sync EALREADY write */
   #define TX_SETSAXATTR           21      /* Set sa xattrs on file */
   #define TX_RENAME_EXCHANGE      22      /* Atomic swap via renameat2 */
   #define TX_RENAME_WHITEOUT      23      /* Atomic whiteout via renameat2 */
   #define TX_MAX_TYPE             24      /* Max transaction type */
   
   /*
    * The transactions for mkdir, symlink, remove, rmdir, link, and rename
    * may have the following bit set, indicating the original request
    * specified case-insensitive handling of names.
    */
   #define TX_CI   ((uint64_t)0x1 << 63) /* case-insensitive behavior requested */
   
   /*
    * Transactions for write, truncate, setattr, acl_v0, and acl can be logged
    * out of order.  For convenience in the code, all such records must have
    * lr_foid at the same offset.
    */
   #define TX_OOO(txtype)                  \
           ((txtype) == TX_WRITE ||        \
           (txtype) == TX_TRUNCATE ||      \
           (txtype) == TX_SETATTR ||       \
           (txtype) == TX_ACL_V0 ||        \
           (txtype) == TX_ACL ||           \
           (txtype) == TX_WRITE2 ||        \
           (txtype) == TX_SETSAXATTR)
   
   /*
    * The number of dnode slots consumed by the object is stored in the 8
    * unused upper bits of the object ID. We subtract 1 from the value
    * stored on disk for compatibility with implementations that don't
    * support large dnodes. The slot count for a single-slot dnode will
    * contain 0 for those bits to preserve the log record format for
    * "small" dnodes.
    */
   #define LR_FOID_GET_SLOTS(oid) (BF64_GET((oid), 56, 8) + 1)
   #define LR_FOID_SET_SLOTS(oid, x) BF64_SET((oid), 56, 8, (x) - 1)
   #define LR_FOID_GET_OBJ(oid) BF64_GET((oid), 0, DN_MAX_OBJECT_SHIFT)
   #define LR_FOID_SET_OBJ(oid, x) BF64_SET((oid), 0, DN_MAX_OBJECT_SHIFT, (x))
   
   /*
    * Format of log records.
    * The fields are carefully defined to allow them to be aligned
    * and sized the same on sparc & intel architectures.
    * Each log record has a common structure at the beginning.
    *
    * The log record on disk (lrc_seq) holds the sequence number of all log
    * records which is used to ensure we don't replay the same record.
    */
   typedef struct {                        /* common log record header */
           uint64_t        lrc_txtype;     /* intent log transaction type */
           uint64_t        lrc_reclen;     /* transaction record length */
           uint64_t        lrc_txg;        /* dmu transaction group number */
           uint64_t        lrc_seq;        /* see comment above */
   } lr_t;
   
   /*
    * Common start of all out-of-order record types (TX_OOO() above).
    */
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_foid;        /* object id */
   } lr_ooo_t;
   
   /*
    * Additional lr_attr_t fields.
    */
   typedef struct {
           uint64_t        lr_attr_attrs;          /* all of the attributes */
           uint64_t        lr_attr_crtime[2];      /* create time */
           uint8_t         lr_attr_scanstamp[32];
   } lr_attr_end_t;
   
   /*
    * Handle option extended vattr attributes.
    *
    * Whenever new attributes are added the version number
    * will need to be updated as will code in
    * zfs_log.c and zfs_replay.c
    */
   typedef struct {
           uint32_t        lr_attr_masksize; /* number of elements in array */
           uint32_t        lr_attr_bitmap; /* First entry of array */
           /* remainder of array and additional lr_attr_end_t fields */
   } lr_attr_t;
   
   /*
    * log record for creates without optional ACL.
    * This log record does support optional xvattr_t attributes.
    */
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_doid;        /* object id of directory */
           uint64_t        lr_foid;        /* object id of created file object */
           uint64_t        lr_mode;        /* mode of object */
           uint64_t        lr_uid;         /* uid of object */
           uint64_t        lr_gid;         /* gid of object */
           uint64_t        lr_gen;         /* generation (txg of creation) */
           uint64_t        lr_crtime[2];   /* creation time */
           uint64_t        lr_rdev;        /* rdev of object to create */
           /* name of object to create follows this */
           /* for symlinks, link content follows name */
           /* for creates with xvattr data, the name follows the xvattr info */
   } lr_create_t;
   
   /*
    * FUID ACL record will be an array of ACEs from the original ACL.
    * If this array includes ephemeral IDs, the record will also include
    * an array of log-specific FUIDs to replace the ephemeral IDs.
    * Only one copy of each unique domain will be present, so the log-specific
    * FUIDs will use an index into a compressed domain table.  On replay this
    * information will be used to construct real FUIDs (and bypass idmap,
    * since it may not be available).
    */
   
   /*
    * Log record for creates with optional ACL
    * This log record is also used for recording any FUID
    * information needed for replaying the create.  If the
    * file doesn't have any actual ACEs then the lr_aclcnt
    * would be zero.
    *
    * After lr_acl_flags, there are a lr_acl_bytes number of variable sized ace's.
    * If create is also setting xvattr's, then acl data follows xvattr.
    * If ACE FUIDs are needed then they will follow the xvattr_t.  Following
    * the FUIDs will be the domain table information.  The FUIDs for the owner
    * and group will be in lr_create.  Name follows ACL data.
    */
   typedef struct {
           lr_create_t     lr_create;      /* common create portion */
           uint64_t        lr_aclcnt;      /* number of ACEs in ACL */
           uint64_t        lr_domcnt;      /* number of unique domains */
           uint64_t        lr_fuidcnt;     /* number of real fuids */
           uint64_t        lr_acl_bytes;   /* number of bytes in ACL */
           uint64_t        lr_acl_flags;   /* ACL flags */
   } lr_acl_create_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_doid;        /* obj id of directory */
           /* name of object to remove follows this */
   } lr_remove_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_doid;        /* obj id of directory */
           uint64_t        lr_link_obj;    /* obj id of link */
           /* name of object to link follows this */
   } lr_link_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_sdoid;       /* obj id of source directory */
           uint64_t        lr_tdoid;       /* obj id of target directory */
           /* 2 strings: names of source and destination follow this */
   } lr_rename_t;
   
   typedef struct {
           lr_rename_t     lr_rename;      /* common rename portion */
           /* members related to the whiteout file (based on lr_create_t) */
           uint64_t        lr_wfoid;       /* obj id of the new whiteout file */
           uint64_t        lr_wmode;       /* mode of object */
           uint64_t        lr_wuid;        /* uid of whiteout */
           uint64_t        lr_wgid;        /* gid of whiteout */
           uint64_t        lr_wgen;        /* generation (txg of creation) */
           uint64_t        lr_wcrtime[2];  /* creation time */
           uint64_t        lr_wrdev;       /* always makedev(0, 0) */
           /* 2 strings: names of source and destination follow this */
   } lr_rename_whiteout_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_foid;        /* file object to write */
           uint64_t        lr_offset;      /* offset to write to */
           uint64_t        lr_length;      /* user data length to write */
           uint64_t        lr_blkoff;      /* no longer used */
           blkptr_t        lr_blkptr;      /* spa block pointer for replay */
           /* write data will follow for small writes */
   } lr_write_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_foid;        /* object id of file to truncate */
           uint64_t        lr_offset;      /* offset to truncate from */
           uint64_t        lr_length;      /* length to truncate */
   } lr_truncate_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_foid;        /* file object to change attributes */
           uint64_t        lr_mask;        /* mask of attributes to set */
           uint64_t        lr_mode;        /* mode to set */
           uint64_t        lr_uid;         /* uid to set */
           uint64_t        lr_gid;         /* gid to set */
           uint64_t        lr_size;        /* size to set */
           uint64_t        lr_atime[2];    /* access time */
           uint64_t        lr_mtime[2];    /* modification time */
           /* optional attribute lr_attr_t may be here */
   } lr_setattr_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_foid;        /* file object to change attributes */
           uint64_t        lr_size;
           /* xattr name and value follows */
   } lr_setsaxattr_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_foid;        /* obj id of file */
           uint64_t        lr_aclcnt;      /* number of acl entries */
           /* lr_aclcnt number of ace_t entries follow this */
   } lr_acl_v0_t;
   
   typedef struct {
           lr_t            lr_common;      /* common portion of log record */
           uint64_t        lr_foid;        /* obj id of file */
           uint64_t        lr_aclcnt;      /* number of ACEs in ACL */
           uint64_t        lr_domcnt;      /* number of unique domains */
           uint64_t        lr_fuidcnt;     /* number of real fuids */
           uint64_t        lr_acl_bytes;   /* number of bytes in ACL */
           uint64_t        lr_acl_flags;   /* ACL flags */
           /* lr_acl_bytes number of variable sized ace's follows */
   } lr_acl_t;
   
   /*
    * ZIL structure definitions, interface function prototype and globals.
    */
   
   /*
    * Writes are handled in three different ways:
    *
    * WR_INDIRECT:
    *    In this mode, if we need to commit the write later, then the block
    *    is immediately written into the file system (using dmu_sync),
    *    and a pointer to the block is put into the log record.
    *    When the txg commits the block is linked in.
    *    This saves additionally writing the data into the log record.
    *    There are a few requirements for this to occur:
    *      - write is greater than zfs/zvol_immediate_write_sz
    *      - not using slogs (as slogs are assumed to always be faster
    *        than writing into the main pool)
    *      - the write occupies only one block
    * WR_COPIED:
    *    If we know we'll immediately be committing the
    *    transaction (O_SYNC or O_DSYNC), then we allocate a larger
    *    log record here for the data and copy the data in.
    * WR_NEED_COPY:
    *    Otherwise we don't allocate a buffer, and *if* we need to
    *    flush the write later then a buffer is allocated and
    *    we retrieve the data using the dmu.
    */
   typedef enum {
           WR_INDIRECT,    /* indirect - a large write (dmu_sync() data */
                           /* and put blkptr in log, rather than actual data) */
           WR_COPIED,      /* immediate - data is copied into lr_write_t */
           WR_NEED_COPY,   /* immediate - data needs to be copied if pushed */
           WR_NUM_STATES   /* number of states */
   } itx_wr_state_t;
   
   typedef void (*zil_callback_t)(void *data);
   
   typedef struct itx {
           list_node_t     itx_node;       /* linkage on zl_itx_list */
           void            *itx_private;   /* type-specific opaque data */
           itx_wr_state_t  itx_wr_state;   /* write state */
           uint8_t         itx_sync;       /* synchronous transaction */
           zil_callback_t  itx_callback;   /* Called when the itx is persistent */
           void            *itx_callback_data; /* User data for the callback */
           size_t          itx_size;       /* allocated itx structure size */
           uint64_t        itx_oid;        /* object id */
           uint64_t        itx_gen;        /* gen number for zfs_get_data */
           lr_t            itx_lr;         /* common part of log record */
           /* followed by type-specific part of lr_xx_t and its immediate data */
   } itx_t;
   
   /*
    * Used for zil kstat.
    */
   typedef struct zil_stats {
           /*
            * Number of times a ZIL commit (e.g. fsync) has been requested.
            */
           kstat_named_t zil_commit_count;
   
           /*
            * Number of times the ZIL has been flushed to stable storage.
            * This is less than zil_commit_count when commits are "merged"
            * (see the documentation above zil_commit()).
            */
           kstat_named_t zil_commit_writer_count;
   
           /*
            * Number of transactions (reads, writes, renames, etc.)
            * that have been committed.
            */
           kstat_named_t zil_itx_count;
   
           /*
            * See the documentation for itx_wr_state_t above.
            * Note that "bytes" accumulates the length of the transactions
            * (i.e. data), not the actual log record sizes.
            */
           kstat_named_t zil_itx_indirect_count;
           kstat_named_t zil_itx_indirect_bytes;
           kstat_named_t zil_itx_copied_count;
           kstat_named_t zil_itx_copied_bytes;
           kstat_named_t zil_itx_needcopy_count;
           kstat_named_t zil_itx_needcopy_bytes;
   
           /*
            * Transactions which have been allocated to the "normal"
            * (i.e. not slog) storage pool. Note that "bytes" accumulate
            * the actual log record sizes - which do not include the actual
            * data in case of indirect writes.
            */
           kstat_named_t zil_itx_metaslab_normal_count;
           kstat_named_t zil_itx_metaslab_normal_bytes;
   
           /*
            * Transactions which have been allocated to the "slog" storage pool.
            * If there are no separate log devices, this is the same as the
            * "normal" pool.
            */
           kstat_named_t zil_itx_metaslab_slog_count;
           kstat_named_t zil_itx_metaslab_slog_bytes;
   } zil_kstat_values_t;
   
   typedef struct zil_sums {
           wmsum_t zil_commit_count;
           wmsum_t zil_commit_writer_count;
           wmsum_t zil_itx_count;
           wmsum_t zil_itx_indirect_count;
           wmsum_t zil_itx_indirect_bytes;
           wmsum_t zil_itx_copied_count;
           wmsum_t zil_itx_copied_bytes;
           wmsum_t zil_itx_needcopy_count;
           wmsum_t zil_itx_needcopy_bytes;
           wmsum_t zil_itx_metaslab_normal_count;
           wmsum_t zil_itx_metaslab_normal_bytes;
           wmsum_t zil_itx_metaslab_slog_count;
           wmsum_t zil_itx_metaslab_slog_bytes;
   } zil_sums_t;
   
   #define ZIL_STAT_INCR(zil, stat, val) \
           do { \
                   int64_t tmpval = (val); \
                   wmsum_add(&(zil_sums_global.stat), tmpval); \
                   if ((zil)->zl_sums) \
                           wmsum_add(&((zil)->zl_sums->stat), tmpval); \
           } while (0)
   
   #define ZIL_STAT_BUMP(zil, stat) \
       ZIL_STAT_INCR(zil, stat, 1);
   
   typedef int zil_parse_blk_func_t(zilog_t *zilog, const blkptr_t *bp, void *arg,
       uint64_t txg);
   typedef int zil_parse_lr_func_t(zilog_t *zilog, const lr_t *lr, void *arg,
       uint64_t txg);
   typedef int zil_replay_func_t(void *arg1, void *arg2, boolean_t byteswap);
   typedef int zil_get_data_t(void *arg, uint64_t arg2, lr_write_t *lr, char *dbuf,
       struct lwb *lwb, zio_t *zio);
   
   extern int zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func,
       zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg,
       boolean_t decrypt);
   
   extern void     zil_init(void);
   extern void     zil_fini(void);
   
   extern zilog_t  *zil_alloc(objset_t *os, zil_header_t *zh_phys);
   extern void     zil_free(zilog_t *zilog);
   
   extern zilog_t  *zil_open(objset_t *os, zil_get_data_t *get_data,
       zil_sums_t *zil_sums);
   extern void     zil_close(zilog_t *zilog);
   
   extern boolean_t zil_replay(objset_t *os, void *arg,
       zil_replay_func_t *const replay_func[TX_MAX_TYPE]);
   extern boolean_t zil_replaying(zilog_t *zilog, dmu_tx_t *tx);
   extern boolean_t zil_destroy(zilog_t *zilog, boolean_t keep_first);
   extern void     zil_destroy_sync(zilog_t *zilog, dmu_tx_t *tx);
   
   extern itx_t    *zil_itx_create(uint64_t txtype, size_t lrsize);
   extern void     zil_itx_destroy(itx_t *itx);
   extern void     zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx);
   
   extern void     zil_async_to_sync(zilog_t *zilog, uint64_t oid);
   extern void     zil_commit(zilog_t *zilog, uint64_t oid);
   extern void     zil_commit_impl(zilog_t *zilog, uint64_t oid);
   extern void     zil_remove_async(zilog_t *zilog, uint64_t oid);
   
   extern int      zil_reset(const char *osname, void *txarg);
   extern int      zil_claim(struct dsl_pool *dp,
       struct dsl_dataset *ds, void *txarg);
   extern int      zil_check_log_chain(struct dsl_pool *dp,
       struct dsl_dataset *ds, void *tx);
   extern void     zil_sync(zilog_t *zilog, dmu_tx_t *tx);
   extern void     zil_clean(zilog_t *zilog, uint64_t synced_txg);
   
   extern int      zil_suspend(const char *osname, void **cookiep);
   extern void     zil_resume(void *cookie);
   
   extern void     zil_lwb_add_block(struct lwb *lwb, const blkptr_t *bp);
   extern void     zil_lwb_add_txg(struct lwb *lwb, uint64_t txg);
   extern int      zil_bp_tree_add(zilog_t *zilog, const blkptr_t *bp);
   
   extern void     zil_set_sync(zilog_t *zilog, uint64_t syncval);
   
   extern void     zil_set_logbias(zilog_t *zilog, uint64_t slogval);
   
   extern uint64_t zil_max_copied_data(zilog_t *zilog);
   extern uint64_t zil_max_log_data(zilog_t *zilog);
   
   extern void zil_sums_init(zil_sums_t *zs);
   extern void zil_sums_fini(zil_sums_t *zs);
   extern void zil_kstat_values_update(zil_kstat_values_t *zs,
       zil_sums_t *zil_sums);
   
   extern int zil_replay_disable;
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _SYS_ZIL_H */

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