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Diffstat (limited to '')
| -rw-r--r-- | fs/xfs/xfs_log.h | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h new file mode 100644 index 000000000..2728886c2 --- /dev/null +++ b/fs/xfs/xfs_log.h @@ -0,0 +1,166 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * All Rights Reserved. + */ +#ifndef __XFS_LOG_H__ +#define __XFS_LOG_H__ + +struct xfs_cil_ctx; + +struct xfs_log_vec { + struct list_head lv_list; /* CIL lv chain ptrs */ + uint32_t lv_order_id; /* chain ordering info */ + 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) + +/* + * Calculate the log iovec length for a given user buffer length. Intended to be + * used by ->iop_size implementations when sizing buffers of arbitrary + * alignments. + */ +static inline int +xlog_calc_iovec_len(int len) +{ + return roundup(len, sizeof(uint32_t)); +} + +void *xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, + uint type); + +static inline void +xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, + int data_len) +{ + struct xlog_op_header *oph = vec->i_addr; + int len; + + /* + * Always round up the length to the correct alignment so callers don't + * need to know anything about this log vec layout requirement. This + * means we have to zero the area the data to be written does not cover. + * This is complicated by fact the payload region is offset into the + * logvec region by the opheader that tracks the payload. + */ + len = xlog_calc_iovec_len(data_len); + if (len - data_len != 0) { + char *buf = vec->i_addr + sizeof(struct xlog_op_header); + + memset(buf + data_len, 0, len - data_len); + } + + /* + * The opheader tracks aligned payload length, whilst the logvec tracks + * the overall region length. + */ + oph->oh_len = cpu_to_be32(len); + + len += sizeof(struct xlog_op_header); + lv->lv_buf_len += len; + lv->lv_bytes += len; + vec->i_len = len; + + /* Catch buffer overruns */ + ASSERT((void *)lv->lv_buf + lv->lv_bytes <= (void *)lv + lv->lv_size); +} + +/* + * Copy the amount of data requested by the caller into a new log iovec. + */ +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; +} + +static inline void * +xlog_copy_from_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, + const struct xfs_log_iovec *src) +{ + return xlog_copy_iovec(lv, vecp, src->i_type, src->i_addr, src->i_len); +} + +/* + * 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) + +/* + * 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 xlog; + +int xfs_log_force(struct xfs_mount *mp, uint flags); +int xfs_log_force_seq(struct xfs_mount *mp, xfs_csn_t seq, uint flags, + int *log_forced); +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); +void xfs_log_mount_cancel(struct xfs_mount *); +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_reserve(struct xfs_mount *mp, int length, int count, + struct xlog_ticket **ticket, bool permanent); +int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic); +void xfs_log_unmount(struct xfs_mount *mp); +bool xfs_log_writable(struct xfs_mount *mp); + +struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket); +void xfs_log_ticket_put(struct xlog_ticket *ticket); + +void xlog_cil_process_committed(struct list_head *list); +bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip); + +void xfs_log_work_queue(struct xfs_mount *mp); +int xfs_log_quiesce(struct xfs_mount *mp); +void xfs_log_clean(struct xfs_mount *mp); +bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t); + +xfs_lsn_t xlog_grant_push_threshold(struct xlog *log, int need_bytes); +bool xlog_force_shutdown(struct xlog *log, uint32_t shutdown_flags); + +void xlog_use_incompat_feat(struct xlog *log); +void xlog_drop_incompat_feat(struct xlog *log); +int xfs_attr_use_log_assist(struct xfs_mount *mp); + +#endif /* __XFS_LOG_H__ */ |