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linux-next/fs/xfs/xfs_log_priv.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

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/*
* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_LOG_PRIV_H__
#define __XFS_LOG_PRIV_H__
struct xfs_buf;
struct ktrace;
struct log;
struct xfs_buf_cancel;
struct xfs_mount;
/*
* Macros, structures, prototypes for internal log manager use.
*/
#define XLOG_MIN_ICLOGS 2
#define XLOG_MED_ICLOGS 4
#define XLOG_MAX_ICLOGS 8
#define XLOG_CALLBACK_SIZE 10
#define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */
#define XLOG_VERSION_1 1
#define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */
#define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2)
#define XLOG_RECORD_BSIZE (16*1024) /* eventually 32k */
#define XLOG_BIG_RECORD_BSIZE (32*1024) /* 32k buffers */
#define XLOG_MAX_RECORD_BSIZE (256*1024)
#define XLOG_HEADER_CYCLE_SIZE (32*1024) /* cycle data in header */
#define XLOG_RECORD_BSHIFT 14 /* 16384 == 1 << 14 */
#define XLOG_BIG_RECORD_BSHIFT 15 /* 32k == 1 << 15 */
#define XLOG_MAX_RECORD_BSHIFT 18 /* 256k == 1 << 18 */
#define XLOG_BTOLSUNIT(log, b) (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \
(log)->l_mp->m_sb.sb_logsunit)
#define XLOG_LSUNITTOB(log, su) ((su) * (log)->l_mp->m_sb.sb_logsunit)
#define XLOG_HEADER_SIZE 512
#define XLOG_REC_SHIFT(log) \
BTOBB(1 << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \
XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
#define XLOG_TOTAL_REC_SHIFT(log) \
BTOBB(XLOG_MAX_ICLOGS << (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? \
XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
/*
* set lsns
*/
#define ASSIGN_ANY_LSN_HOST(lsn,cycle,block) \
{ \
(lsn) = ((xfs_lsn_t)(cycle)<<32)|(block); \
}
#define ASSIGN_ANY_LSN_DISK(lsn,cycle,block) \
{ \
INT_SET(((uint *)&(lsn))[0], ARCH_CONVERT, (cycle)); \
INT_SET(((uint *)&(lsn))[1], ARCH_CONVERT, (block)); \
}
#define ASSIGN_LSN(lsn,log) \
ASSIGN_ANY_LSN_DISK(lsn,(log)->l_curr_cycle,(log)->l_curr_block);
#define XLOG_SET(f,b) (((f) & (b)) == (b))
#define GET_CYCLE(ptr, arch) \
(INT_GET(*(uint *)(ptr), arch) == XLOG_HEADER_MAGIC_NUM ? \
INT_GET(*((uint *)(ptr)+1), arch) : \
INT_GET(*(uint *)(ptr), arch) \
)
#define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1)
#ifdef __KERNEL__
/*
* get client id from packed copy.
*
* this hack is here because the xlog_pack code copies four bytes
* of xlog_op_header containing the fields oh_clientid, oh_flags
* and oh_res2 into the packed copy.
*
* later on this four byte chunk is treated as an int and the
* client id is pulled out.
*
* this has endian issues, of course.
*/
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define GET_CLIENT_ID(i,arch) \
((i) & 0xff)
#else
#define GET_CLIENT_ID(i,arch) \
((i) >> 24)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XLOG_GRANT_SUB_SPACE)
void xlog_grant_sub_space(struct log *log, int bytes, int type);
#define XLOG_GRANT_SUB_SPACE(log,bytes,type) \
xlog_grant_sub_space(log,bytes,type)
#else
#define XLOG_GRANT_SUB_SPACE(log,bytes,type) \
{ \
if (type == 'w') { \
(log)->l_grant_write_bytes -= (bytes); \
if ((log)->l_grant_write_bytes < 0) { \
(log)->l_grant_write_bytes += (log)->l_logsize; \
(log)->l_grant_write_cycle--; \
} \
} else { \
(log)->l_grant_reserve_bytes -= (bytes); \
if ((log)->l_grant_reserve_bytes < 0) { \
(log)->l_grant_reserve_bytes += (log)->l_logsize;\
(log)->l_grant_reserve_cycle--; \
} \
} \
}
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XLOG_GRANT_ADD_SPACE)
void xlog_grant_add_space(struct log *log, int bytes, int type);
#define XLOG_GRANT_ADD_SPACE(log,bytes,type) \
xlog_grant_add_space(log,bytes,type)
#else
#define XLOG_GRANT_ADD_SPACE(log,bytes,type) \
{ \
if (type == 'w') { \
(log)->l_grant_write_bytes += (bytes); \
if ((log)->l_grant_write_bytes > (log)->l_logsize) { \
(log)->l_grant_write_bytes -= (log)->l_logsize; \
(log)->l_grant_write_cycle++; \
} \
} else { \
(log)->l_grant_reserve_bytes += (bytes); \
if ((log)->l_grant_reserve_bytes > (log)->l_logsize) { \
(log)->l_grant_reserve_bytes -= (log)->l_logsize;\
(log)->l_grant_reserve_cycle++; \
} \
} \
}
#endif
#define XLOG_INS_TICKETQ(q,tic) \
{ \
if (q) { \
(tic)->t_next = (q); \
(tic)->t_prev = (q)->t_prev; \
(q)->t_prev->t_next = (tic); \
(q)->t_prev = (tic); \
} else { \
(tic)->t_prev = (tic)->t_next = (tic); \
(q) = (tic); \
} \
(tic)->t_flags |= XLOG_TIC_IN_Q; \
}
#define XLOG_DEL_TICKETQ(q,tic) \
{ \
if ((tic) == (tic)->t_next) { \
(q) = NULL; \
} else { \
(q) = (tic)->t_next; \
(tic)->t_next->t_prev = (tic)->t_prev; \
(tic)->t_prev->t_next = (tic)->t_next; \
} \
(tic)->t_next = (tic)->t_prev = NULL; \
(tic)->t_flags &= ~XLOG_TIC_IN_Q; \
}
#define GRANT_LOCK(log) mutex_spinlock(&(log)->l_grant_lock)
#define GRANT_UNLOCK(log, s) mutex_spinunlock(&(log)->l_grant_lock, s)
#define LOG_LOCK(log) mutex_spinlock(&(log)->l_icloglock)
#define LOG_UNLOCK(log, s) mutex_spinunlock(&(log)->l_icloglock, s)
#define xlog_panic(args...) cmn_err(CE_PANIC, ## args)
#define xlog_exit(args...) cmn_err(CE_PANIC, ## args)
#define xlog_warn(args...) cmn_err(CE_WARN, ## args)
/*
* In core log state
*/
#define XLOG_STATE_ACTIVE 0x0001 /* Current IC log being written to */
#define XLOG_STATE_WANT_SYNC 0x0002 /* Want to sync this iclog; no more writes */
#define XLOG_STATE_SYNCING 0x0004 /* This IC log is syncing */
#define XLOG_STATE_DONE_SYNC 0x0008 /* Done syncing to disk */
#define XLOG_STATE_DO_CALLBACK \
0x0010 /* Process callback functions */
#define XLOG_STATE_CALLBACK 0x0020 /* Callback functions now */
#define XLOG_STATE_DIRTY 0x0040 /* Dirty IC log, not ready for ACTIVE status*/
#define XLOG_STATE_IOERROR 0x0080 /* IO error happened in sync'ing log */
#define XLOG_STATE_ALL 0x7FFF /* All possible valid flags */
#define XLOG_STATE_NOTUSED 0x8000 /* This IC log not being used */
#endif /* __KERNEL__ */
/*
* Flags to log operation header
*
* The first write of a new transaction will be preceded with a start
* record, XLOG_START_TRANS. Once a transaction is committed, a commit
* record is written, XLOG_COMMIT_TRANS. If a single region can not fit into
* the remainder of the current active in-core log, it is split up into
* multiple regions. Each partial region will be marked with a
* XLOG_CONTINUE_TRANS until the last one, which gets marked with XLOG_END_TRANS.
*
*/
#define XLOG_START_TRANS 0x01 /* Start a new transaction */
#define XLOG_COMMIT_TRANS 0x02 /* Commit this transaction */
#define XLOG_CONTINUE_TRANS 0x04 /* Cont this trans into new region */
#define XLOG_WAS_CONT_TRANS 0x08 /* Cont this trans into new region */
#define XLOG_END_TRANS 0x10 /* End a continued transaction */
#define XLOG_UNMOUNT_TRANS 0x20 /* Unmount a filesystem transaction */
#define XLOG_SKIP_TRANS (XLOG_COMMIT_TRANS | XLOG_CONTINUE_TRANS | \
XLOG_WAS_CONT_TRANS | XLOG_END_TRANS | \
XLOG_UNMOUNT_TRANS)
#ifdef __KERNEL__
/*
* Flags to log ticket
*/
#define XLOG_TIC_INITED 0x1 /* has been initialized */
#define XLOG_TIC_PERM_RESERV 0x2 /* permanent reservation */
#define XLOG_TIC_IN_Q 0x4
#endif /* __KERNEL__ */
#define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */
/*
* Flags for log structure
*/
#define XLOG_CHKSUM_MISMATCH 0x1 /* used only during recovery */
#define XLOG_ACTIVE_RECOVERY 0x2 /* in the middle of recovery */
#define XLOG_RECOVERY_NEEDED 0x4 /* log was recovered */
#define XLOG_IO_ERROR 0x8 /* log hit an I/O error, and being
shutdown */
typedef __uint32_t xlog_tid_t;
#ifdef __KERNEL__
/*
* Below are states for covering allocation transactions.
* By covering, we mean changing the h_tail_lsn in the last on-disk
* log write such that no allocation transactions will be re-done during
* recovery after a system crash. Recovery starts at the last on-disk
* log write.
*
* These states are used to insert dummy log entries to cover
* space allocation transactions which can undo non-transactional changes
* after a crash. Writes to a file with space
* already allocated do not result in any transactions. Allocations
* might include space beyond the EOF. So if we just push the EOF a
* little, the last transaction for the file could contain the wrong
* size. If there is no file system activity, after an allocation
* transaction, and the system crashes, the allocation transaction
* will get replayed and the file will be truncated. This could
* be hours/days/... after the allocation occurred.
*
* The fix for this is to do two dummy transactions when the
* system is idle. We need two dummy transaction because the h_tail_lsn
* in the log record header needs to point beyond the last possible
* non-dummy transaction. The first dummy changes the h_tail_lsn to
* the first transaction before the dummy. The second dummy causes
* h_tail_lsn to point to the first dummy. Recovery starts at h_tail_lsn.
*
* These dummy transactions get committed when everything
* is idle (after there has been some activity).
*
* There are 5 states used to control this.
*
* IDLE -- no logging has been done on the file system or
* we are done covering previous transactions.
* NEED -- logging has occurred and we need a dummy transaction
* when the log becomes idle.
* DONE -- we were in the NEED state and have committed a dummy
* transaction.
* NEED2 -- we detected that a dummy transaction has gone to the
* on disk log with no other transactions.
* DONE2 -- we committed a dummy transaction when in the NEED2 state.
*
* There are two places where we switch states:
*
* 1.) In xfs_sync, when we detect an idle log and are in NEED or NEED2.
* We commit the dummy transaction and switch to DONE or DONE2,
* respectively. In all other states, we don't do anything.
*
* 2.) When we finish writing the on-disk log (xlog_state_clean_log).
*
* No matter what state we are in, if this isn't the dummy
* transaction going out, the next state is NEED.
* So, if we aren't in the DONE or DONE2 states, the next state
* is NEED. We can't be finishing a write of the dummy record
* unless it was committed and the state switched to DONE or DONE2.
*
* If we are in the DONE state and this was a write of the
* dummy transaction, we move to NEED2.
*
* If we are in the DONE2 state and this was a write of the
* dummy transaction, we move to IDLE.
*
*
* Writing only one dummy transaction can get appended to
* one file space allocation. When this happens, the log recovery
* code replays the space allocation and a file could be truncated.
* This is why we have the NEED2 and DONE2 states before going idle.
*/
#define XLOG_STATE_COVER_IDLE 0
#define XLOG_STATE_COVER_NEED 1
#define XLOG_STATE_COVER_DONE 2
#define XLOG_STATE_COVER_NEED2 3
#define XLOG_STATE_COVER_DONE2 4
#define XLOG_COVER_OPS 5
typedef struct xlog_ticket {
sv_t t_sema; /* sleep on this semaphore :20 */
struct xlog_ticket *t_next; /* : 4 */
struct xlog_ticket *t_prev; /* : 4 */
xlog_tid_t t_tid; /* transaction identifier : 4 */
int t_curr_res; /* current reservation in bytes : 4 */
int t_unit_res; /* unit reservation in bytes : 4 */
__uint8_t t_ocnt; /* original count : 1 */
__uint8_t t_cnt; /* current count : 1 */
__uint8_t t_clientid; /* who does this belong to; : 1 */
__uint8_t t_flags; /* properties of reservation : 1 */
} xlog_ticket_t;
#endif
typedef struct xlog_op_header {
xlog_tid_t oh_tid; /* transaction id of operation : 4 b */
int oh_len; /* bytes in data region : 4 b */
__uint8_t oh_clientid; /* who sent me this : 1 b */
__uint8_t oh_flags; /* : 1 b */
ushort oh_res2; /* 32 bit align : 2 b */
} xlog_op_header_t;
/* valid values for h_fmt */
#define XLOG_FMT_UNKNOWN 0
#define XLOG_FMT_LINUX_LE 1
#define XLOG_FMT_LINUX_BE 2
#define XLOG_FMT_IRIX_BE 3
/* our fmt */
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define XLOG_FMT XLOG_FMT_LINUX_LE
#else
#if __BYTE_ORDER == __BIG_ENDIAN
#define XLOG_FMT XLOG_FMT_LINUX_BE
#else
#error unknown byte order
#endif
#endif
typedef struct xlog_rec_header {
uint h_magicno; /* log record (LR) identifier : 4 */
uint h_cycle; /* write cycle of log : 4 */
int h_version; /* LR version : 4 */
int h_len; /* len in bytes; should be 64-bit aligned: 4 */
xfs_lsn_t h_lsn; /* lsn of this LR : 8 */
xfs_lsn_t h_tail_lsn; /* lsn of 1st LR w/ buffers not committed: 8 */
uint h_chksum; /* may not be used; non-zero if used : 4 */
int h_prev_block; /* block number to previous LR : 4 */
int h_num_logops; /* number of log operations in this LR : 4 */
uint h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE];
/* new fields */
int h_fmt; /* format of log record : 4 */
uuid_t h_fs_uuid; /* uuid of FS : 16 */
int h_size; /* iclog size : 4 */
} xlog_rec_header_t;
typedef struct xlog_rec_ext_header {
uint xh_cycle; /* write cycle of log : 4 */
uint xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /* : 256 */
} xlog_rec_ext_header_t;
#ifdef __KERNEL__
/*
* - A log record header is 512 bytes. There is plenty of room to grow the
* xlog_rec_header_t into the reserved space.
* - ic_data follows, so a write to disk can start at the beginning of
* the iclog.
* - ic_forcesema is used to implement synchronous forcing of the iclog to disk.
* - ic_next is the pointer to the next iclog in the ring.
* - ic_bp is a pointer to the buffer used to write this incore log to disk.
* - ic_log is a pointer back to the global log structure.
* - ic_callback is a linked list of callback function/argument pairs to be
* called after an iclog finishes writing.
* - ic_size is the full size of the header plus data.
* - ic_offset is the current number of bytes written to in this iclog.
* - ic_refcnt is bumped when someone is writing to the log.
* - ic_state is the state of the iclog.
*/
typedef struct xlog_iclog_fields {
sv_t ic_forcesema;
sv_t ic_writesema;
struct xlog_in_core *ic_next;
struct xlog_in_core *ic_prev;
struct xfs_buf *ic_bp;
struct log *ic_log;
xfs_log_callback_t *ic_callback;
xfs_log_callback_t **ic_callback_tail;
#ifdef XFS_LOG_TRACE
struct ktrace *ic_trace;
#endif
int ic_size;
int ic_offset;
int ic_refcnt;
int ic_bwritecnt;
ushort_t ic_state;
char *ic_datap; /* pointer to iclog data */
} xlog_iclog_fields_t;
typedef union xlog_in_core2 {
xlog_rec_header_t hic_header;
xlog_rec_ext_header_t hic_xheader;
char hic_sector[XLOG_HEADER_SIZE];
} xlog_in_core_2_t;
typedef struct xlog_in_core {
xlog_iclog_fields_t hic_fields;
xlog_in_core_2_t *hic_data;
} xlog_in_core_t;
/*
* Defines to save our code from this glop.
*/
#define ic_forcesema hic_fields.ic_forcesema
#define ic_writesema hic_fields.ic_writesema
#define ic_next hic_fields.ic_next
#define ic_prev hic_fields.ic_prev
#define ic_bp hic_fields.ic_bp
#define ic_log hic_fields.ic_log
#define ic_callback hic_fields.ic_callback
#define ic_callback_tail hic_fields.ic_callback_tail
#define ic_trace hic_fields.ic_trace
#define ic_size hic_fields.ic_size
#define ic_offset hic_fields.ic_offset
#define ic_refcnt hic_fields.ic_refcnt
#define ic_bwritecnt hic_fields.ic_bwritecnt
#define ic_state hic_fields.ic_state
#define ic_datap hic_fields.ic_datap
#define ic_header hic_data->hic_header
/*
* The reservation head lsn is not made up of a cycle number and block number.
* Instead, it uses a cycle number and byte number. Logs don't expect to
* overflow 31 bits worth of byte offset, so using a byte number will mean
* that round off problems won't occur when releasing partial reservations.
*/
typedef struct log {
/* The following block of fields are changed while holding icloglock */
sema_t l_flushsema; /* iclog flushing semaphore */
int l_flushcnt; /* # of procs waiting on this
* sema */
int l_ticket_cnt; /* free ticket count */
int l_ticket_tcnt; /* total ticket count */
int l_covered_state;/* state of "covering disk
* log entries" */
xlog_ticket_t *l_freelist; /* free list of tickets */
xlog_ticket_t *l_unmount_free;/* kmem_free these addresses */
xlog_ticket_t *l_tail; /* free list of tickets */
xlog_in_core_t *l_iclog; /* head log queue */
lock_t l_icloglock; /* grab to change iclog state */
xfs_lsn_t l_tail_lsn; /* lsn of 1st LR with unflushed
* buffers */
xfs_lsn_t l_last_sync_lsn;/* lsn of last LR on disk */
struct xfs_mount *l_mp; /* mount point */
struct xfs_buf *l_xbuf; /* extra buffer for log
* wrapping */
struct xfs_buftarg *l_targ; /* buftarg of log */
xfs_daddr_t l_logBBstart; /* start block of log */
int l_logsize; /* size of log in bytes */
int l_logBBsize; /* size of log in BB chunks */
int l_curr_cycle; /* Cycle number of log writes */
int l_prev_cycle; /* Cycle number before last
* block increment */
int l_curr_block; /* current logical log block */
int l_prev_block; /* previous logical log block */
int l_iclog_size; /* size of log in bytes */
int l_iclog_size_log; /* log power size of log */
int l_iclog_bufs; /* number of iclog buffers */
/* The following field are used for debugging; need to hold icloglock */
char *l_iclog_bak[XLOG_MAX_ICLOGS];
/* The following block of fields are changed while holding grant_lock */
lock_t l_grant_lock;
xlog_ticket_t *l_reserve_headq;
xlog_ticket_t *l_write_headq;
int l_grant_reserve_cycle;
int l_grant_reserve_bytes;
int l_grant_write_cycle;
int l_grant_write_bytes;
/* The following fields don't need locking */
#ifdef XFS_LOG_TRACE
struct ktrace *l_trace;
struct ktrace *l_grant_trace;
#endif
uint l_flags;
uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */
struct xfs_buf_cancel **l_buf_cancel_table;
int l_iclog_hsize; /* size of iclog header */
int l_iclog_heads; /* # of iclog header sectors */
uint l_sectbb_log; /* log2 of sector size in BBs */
uint l_sectbb_mask; /* sector size (in BBs)
* alignment mask */
} xlog_t;
/* common routines */
extern xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
extern int xlog_find_head(xlog_t *log, xfs_daddr_t *head_blk);
extern int xlog_find_tail(xlog_t *log,
xfs_daddr_t *head_blk,
xfs_daddr_t *tail_blk,
int readonly);
extern int xlog_recover(xlog_t *log, int readonly);
extern int xlog_recover_finish(xlog_t *log, int mfsi_flags);
extern void xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int);
extern void xlog_recover_process_iunlinks(xlog_t *log);
extern struct xfs_buf *xlog_get_bp(xlog_t *, int);
extern void xlog_put_bp(struct xfs_buf *);
extern int xlog_bread(xlog_t *, xfs_daddr_t, int, struct xfs_buf *);
extern xfs_caddr_t xlog_align(xlog_t *, xfs_daddr_t, int, struct xfs_buf *);
/* iclog tracing */
#define XLOG_TRACE_GRAB_FLUSH 1
#define XLOG_TRACE_REL_FLUSH 2
#define XLOG_TRACE_SLEEP_FLUSH 3
#define XLOG_TRACE_WAKE_FLUSH 4
#endif /* __KERNEL__ */
#endif /* __XFS_LOG_PRIV_H__ */
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