freebsd-nq/module/zfs/include/sys/zil.h

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2008-11-20 20:01:55 +00:00
/*
* 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 http://www.opensolaris.org/os/licensing.
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_ZIL_H
#define _SYS_ZIL_H
#include <sys/types.h>
#include <sys/spa.h>
#include <sys/zio.h>
#include <sys/dmu.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* 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_seq; /* highest claimed sequence number */
uint64_t zh_pad[5];
} zil_header_t;
/*
* Log block trailer - structure at the end of the header and each log block
*
* The zit_bt contains a zbt_cksum which for the intent log is
* the sequence number of this log block. A seq of 0 is invalid.
* The zbt_cksum is checked by the SPA against the sequence
* number passed in the blk_cksum field of the blkptr_t
*/
typedef struct zil_trailer {
uint64_t zit_pad;
blkptr_t zit_next_blk; /* next block in chain */
uint64_t zit_nused; /* bytes in log block used */
zio_block_tail_t zit_bt; /* block trailer */
} zil_trailer_t;
#define ZIL_MIN_BLKSZ 4096ULL
#define ZIL_MAX_BLKSZ SPA_MAXBLOCKSIZE
#define ZIL_BLK_DATA_SZ(lwb) ((lwb)->lwb_sz - sizeof (zil_trailer_t))
/*
* 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_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_MAX_TYPE 20 /* 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 */
/*
* 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.
*
* Note, lrc_seq holds two different sequence numbers. Whilst in memory
* it contains the transaction sequence number. The log record on
* disk holds the sequence number of all log records which is used to
* ensure we don't replay the same record. The two sequence numbers are
* different because the transactions can now be pushed out of order.
*/
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;
/*
* 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 any additional 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.
*/
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_bytes number of variable sized ace's follows */
/* 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 the lr_create */
/* portion of the record. */
/* name follows ACL data */
} 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_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; /* offset represented by lr_blkptr */
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; /* 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.
*/
/*
* ZFS intent log transaction structure
*/
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 */
} itx_wr_state_t;
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 */
uint64_t itx_sod; /* record size on disk */
lr_t itx_lr; /* common part of log record */
/* followed by type-specific part of lr_xx_t and its immediate data */
} itx_t;
/*
* zgd_t is passed through dmu_sync() to the callback routine zfs_get_done()
* to handle the cleanup of the dmu_sync() buffer write
*/
typedef struct {
zilog_t *zgd_zilog; /* zilog */
blkptr_t *zgd_bp; /* block pointer */
struct rl *zgd_rl; /* range lock */
} zgd_t;
typedef void zil_parse_blk_func_t(zilog_t *zilog, blkptr_t *bp, void *arg,
uint64_t txg);
typedef void zil_parse_lr_func_t(zilog_t *zilog, lr_t *lr, void *arg,
uint64_t txg);
typedef int zil_replay_func_t();
typedef int zil_get_data_t(void *arg, lr_write_t *lr, char *dbuf, zio_t *zio);
extern uint64_t 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);
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);
extern void zil_close(zilog_t *zilog);
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extern void zil_replay(objset_t *os, void *arg,
zil_replay_func_t *replay_func[TX_MAX_TYPE]);
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extern void zil_destroy(zilog_t *zilog, boolean_t keep_first);
extern void zil_rollback_destroy(zilog_t *zilog, dmu_tx_t *tx);
extern itx_t *zil_itx_create(uint64_t txtype, size_t lrsize);
extern uint64_t zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx);
extern void zil_commit(zilog_t *zilog, uint64_t seq, uint64_t oid);
extern int zil_claim(char *osname, void *txarg);
extern int zil_check_log_chain(char *osname, void *txarg);
extern int zil_clear_log_chain(char *osname, void *txarg);
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extern void zil_sync(zilog_t *zilog, dmu_tx_t *tx);
extern void zil_clean(zilog_t *zilog);
extern int zil_is_committed(zilog_t *zilog);
extern int zil_suspend(zilog_t *zilog);
extern void zil_resume(zilog_t *zilog);
extern void zil_add_block(zilog_t *zilog, blkptr_t *bp);
extern int zil_disable;
#ifdef __cplusplus
}
#endif
#endif /* _SYS_ZIL_H */