167 lines
4.8 KiB
C
167 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#ifndef __XFS_LOG_H__
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#define __XFS_LOG_H__
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struct xfs_cil_ctx;
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struct xfs_log_vec {
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struct list_head lv_list; /* CIL lv chain ptrs */
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uint32_t lv_order_id; /* chain ordering info */
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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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/*
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* Calculate the log iovec length for a given user buffer length. Intended to be
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* used by ->iop_size implementations when sizing buffers of arbitrary
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* alignments.
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*/
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static inline int
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xlog_calc_iovec_len(int len)
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{
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return roundup(len, sizeof(uint32_t));
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}
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void *xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
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uint type);
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static inline void
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xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec,
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int data_len)
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{
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struct xlog_op_header *oph = vec->i_addr;
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int len;
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/*
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* Always round up the length to the correct alignment so callers don't
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* need to know anything about this log vec layout requirement. This
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* means we have to zero the area the data to be written does not cover.
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* This is complicated by fact the payload region is offset into the
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* logvec region by the opheader that tracks the payload.
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*/
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len = xlog_calc_iovec_len(data_len);
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if (len - data_len != 0) {
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char *buf = vec->i_addr + sizeof(struct xlog_op_header);
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memset(buf + data_len, 0, len - data_len);
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}
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/*
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* The opheader tracks aligned payload length, whilst the logvec tracks
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* the overall region length.
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*/
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oph->oh_len = cpu_to_be32(len);
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len += sizeof(struct xlog_op_header);
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lv->lv_buf_len += len;
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lv->lv_bytes += len;
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vec->i_len = len;
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/* Catch buffer overruns */
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ASSERT((void *)lv->lv_buf + lv->lv_bytes <= (void *)lv + lv->lv_size);
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}
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/*
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* Copy the amount of data requested by the caller into a new log iovec.
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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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static inline void *
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xlog_copy_from_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
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const struct xfs_log_iovec *src)
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{
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return xlog_copy_iovec(lv, vecp, src->i_type, src->i_addr, src->i_len);
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}
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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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* 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 xlog;
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int xfs_log_force(struct xfs_mount *mp, uint flags);
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int xfs_log_force_seq(struct xfs_mount *mp, xfs_csn_t seq, uint flags,
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int *log_forced);
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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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void xfs_log_mount_cancel(struct xfs_mount *);
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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_reserve(struct xfs_mount *mp, int length, int count,
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struct xlog_ticket **ticket, bool permanent);
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int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
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void xfs_log_unmount(struct xfs_mount *mp);
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bool xfs_log_writable(struct xfs_mount *mp);
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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 xlog_cil_process_committed(struct list_head *list);
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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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int xfs_log_quiesce(struct xfs_mount *mp);
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void xfs_log_clean(struct xfs_mount *mp);
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bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
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xfs_lsn_t xlog_grant_push_threshold(struct xlog *log, int need_bytes);
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bool xlog_force_shutdown(struct xlog *log, uint32_t shutdown_flags);
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void xlog_use_incompat_feat(struct xlog *log);
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void xlog_drop_incompat_feat(struct xlog *log);
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int xfs_attr_use_log_assist(struct xfs_mount *mp);
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#endif /* __XFS_LOG_H__ */
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