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