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166 lines
4.8 KiB
166 lines
4.8 KiB
// 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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