* CDDL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
- * Use is subject to license terms.
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
*/
+/* Portions Copyright 2010 Robert Milkowski */
+
#ifndef _SYS_ZIL_H
#define _SYS_ZIL_H
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];
+ 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;
/*
- * Log block trailer - structure at the end of the header and each log block
+ * 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 compatability.
*
- * The zit_bt contains a zbt_cksum which for the intent log is
+ * 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 zbt_cksum is checked by the SPA against the sequence
+ * 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_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;
+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
#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 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 */
+#define TX_WRITE2 20 /* dmu_sync EALREADY write */
+#define TX_MAX_TYPE 21 /* Max transaction type */
/*
* The transactions for mkdir, symlink, remove, rmdir, link, and rename
#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)
+
+/*
* 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.
+ * 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 */
} 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;
+
+/*
* Handle option extended vattr attributes.
*
* Whenever new attributes are added the version number
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 */
+ 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;
*/
/*
- * ZFS intent log transaction structure
+ * 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 (FSYNC or FDSYNC), the 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 struct itx {
itx_wr_state_t itx_wr_state; /* write state */
uint8_t itx_sync; /* synchronous transaction */
uint64_t itx_sod; /* record size on disk */
+ uint64_t itx_oid; /* object id */
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,
+typedef int 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,
+typedef int zil_parse_lr_func_t(zilog_t *zilog, lr_t *lr, void *arg,
uint64_t txg);
-typedef int zil_replay_func_t();
-typedef void zil_replay_cleaner_t();
+typedef int zil_replay_func_t(void *, char *, boolean_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,
+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);
extern void zil_init(void);
extern zilog_t *zil_open(objset_t *os, zil_get_data_t *get_data);
extern void zil_close(zilog_t *zilog);
-extern void zil_replay(objset_t *os, void *arg, uint64_t *txgp,
- zil_replay_func_t *replay_func[TX_MAX_TYPE],
- zil_replay_cleaner_t *replay_cleaner);
+extern void zil_replay(objset_t *os, void *arg,
+ zil_replay_func_t *replay_func[TX_MAX_TYPE]);
+extern boolean_t zil_replaying(zilog_t *zilog, dmu_tx_t *tx);
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_itx_destroy(itx_t *itx);
+extern void 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 void zil_commit(zilog_t *zilog, 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);
+extern int zil_vdev_offline(const char *osname, void *txarg);
+extern int zil_claim(const char *osname, void *txarg);
+extern int zil_check_log_chain(const char *osname, void *txarg);
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 void zil_clean(zilog_t *zilog, uint64_t synced_txg);
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 void zil_add_block(zilog_t *zilog, const blkptr_t *bp);
+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 int zil_disable;
+extern int zil_replay_disable;
#ifdef __cplusplus
}
git://git.camperquake.de / zfs.git / blobdiff