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Diffstat (limited to 'fs/xfs/xfs_log.h')
| -rw-r--r-- | fs/xfs/xfs_log.h | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h new file mode 100644 index 000000000..84e0deb95 --- /dev/null +++ b/fs/xfs/xfs_log.h @@ -0,0 +1,193 @@ +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms 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. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#ifndef __XFS_LOG_H__ +#define __XFS_LOG_H__ + +struct xfs_log_vec { + struct xfs_log_vec *lv_next; /* next lv in build list */ + int lv_niovecs; /* number of iovecs in lv */ + struct xfs_log_iovec *lv_iovecp; /* iovec array */ + struct xfs_log_item *lv_item; /* owner */ + char *lv_buf; /* formatted buffer */ + int lv_bytes; /* accounted space in buffer */ + int lv_buf_len; /* aligned size of buffer */ + int lv_size; /* size of allocated lv */ +}; + +#define XFS_LOG_VEC_ORDERED (-1) + +static inline void * +xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, + uint type) +{ + struct xfs_log_iovec *vec = *vecp; + + if (vec) { + ASSERT(vec - lv->lv_iovecp < lv->lv_niovecs); + vec++; + } else { + vec = &lv->lv_iovecp[0]; + } + + vec->i_type = type; + vec->i_addr = lv->lv_buf + lv->lv_buf_len; + + ASSERT(IS_ALIGNED((unsigned long)vec->i_addr, sizeof(uint64_t))); + + *vecp = vec; + return vec->i_addr; +} + +/* + * We need to make sure the next buffer is naturally aligned for the biggest + * basic data type we put into it. We already accounted for this padding when + * sizing the buffer. + * + * However, this padding does not get written into the log, and hence we have to + * track the space used by the log vectors separately to prevent log space hangs + * due to inaccurate accounting (i.e. a leak) of the used log space through the + * CIL context ticket. + */ +static inline void +xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, int len) +{ + lv->lv_buf_len += round_up(len, sizeof(uint64_t)); + lv->lv_bytes += len; + vec->i_len = len; +} + +static inline void * +xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, + uint type, void *data, int len) +{ + void *buf; + + buf = xlog_prepare_iovec(lv, vecp, type); + memcpy(buf, data, len); + xlog_finish_iovec(lv, *vecp, len); + return buf; +} + +/* + * Structure used to pass callback function and the function's argument + * to the log manager. + */ +typedef struct xfs_log_callback { + struct xfs_log_callback *cb_next; + void (*cb_func)(void *, int); + void *cb_arg; +} xfs_log_callback_t; + +/* + * By comparing each component, we don't have to worry about extra + * endian issues in treating two 32 bit numbers as one 64 bit number + */ +static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2) +{ + if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2)) + return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999; + + if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2)) + return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999; + + return 0; +} + +#define XFS_LSN_CMP(x,y) _lsn_cmp(x,y) + +/* + * Macros, structures, prototypes for interface to the log manager. + */ + +/* + * Flags to xfs_log_done() + */ +#define XFS_LOG_REL_PERM_RESERV 0x1 + +/* + * Flags to xfs_log_force() + * + * XFS_LOG_SYNC: Synchronous force in-core log to disk + */ +#define XFS_LOG_SYNC 0x1 + +/* Log manager interfaces */ +struct xfs_mount; +struct xlog_in_core; +struct xlog_ticket; +struct xfs_log_item; +struct xfs_item_ops; +struct xfs_trans; +struct xfs_log_callback; + +xfs_lsn_t xfs_log_done(struct xfs_mount *mp, + struct xlog_ticket *ticket, + struct xlog_in_core **iclog, + uint flags); +int _xfs_log_force(struct xfs_mount *mp, + uint flags, + int *log_forced); +void xfs_log_force(struct xfs_mount *mp, + uint flags); +int _xfs_log_force_lsn(struct xfs_mount *mp, + xfs_lsn_t lsn, + uint flags, + int *log_forced); +void xfs_log_force_lsn(struct xfs_mount *mp, + xfs_lsn_t lsn, + uint flags); +int xfs_log_mount(struct xfs_mount *mp, + struct xfs_buftarg *log_target, + xfs_daddr_t start_block, + int num_bblocks); +int xfs_log_mount_finish(struct xfs_mount *mp); +xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp); +xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp); +void xfs_log_space_wake(struct xfs_mount *mp); +int xfs_log_notify(struct xfs_mount *mp, + struct xlog_in_core *iclog, + struct xfs_log_callback *callback_entry); +int xfs_log_release_iclog(struct xfs_mount *mp, + struct xlog_in_core *iclog); +int xfs_log_reserve(struct xfs_mount *mp, + int length, + int count, + struct xlog_ticket **ticket, + __uint8_t clientid, + bool permanent, + uint t_type); +int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic); +int xfs_log_unmount_write(struct xfs_mount *mp); +void xfs_log_unmount(struct xfs_mount *mp); +int xfs_log_force_umount(struct xfs_mount *mp, int logerror); +int xfs_log_need_covered(struct xfs_mount *mp); + +void xlog_iodone(struct xfs_buf *); + +struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket); +void xfs_log_ticket_put(struct xlog_ticket *ticket); + +void xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp, + xfs_lsn_t *commit_lsn, int flags); +bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip); + +void xfs_log_work_queue(struct xfs_mount *mp); +void xfs_log_worker(struct work_struct *work); +void xfs_log_quiesce(struct xfs_mount *mp); + +#endif /* __XFS_LOG_H__ */ |