1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_LOG_H__ 7 #define __XFS_LOG_H__ 8 9 struct xfs_cil_ctx; 10 11 struct xfs_log_vec { 12 struct list_head lv_list; /* CIL lv chain ptrs */ 13 uint32_t lv_order_id; /* chain ordering info */ 14 int lv_niovecs; /* number of iovecs in lv */ 15 struct xfs_log_iovec *lv_iovecp; /* iovec array */ 16 struct xfs_log_item *lv_item; /* owner */ 17 char *lv_buf; /* formatted buffer */ 18 int lv_bytes; /* accounted space in buffer */ 19 int lv_buf_used; /* buffer space used so far */ 20 int lv_alloc_size; /* size of allocated lv */ 21 }; 22 23 #define XFS_LOG_VEC_ORDERED (-1) 24 25 /* 26 * Calculate the log iovec length for a given user buffer length. Intended to be 27 * used by ->iop_size implementations when sizing buffers of arbitrary 28 * alignments. 29 */ 30 static inline int 31 xlog_calc_iovec_len(int len) 32 { 33 return roundup(len, sizeof(uint32_t)); 34 } 35 36 void *xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, 37 uint type); 38 39 static inline void 40 xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, 41 int data_len) 42 { 43 struct xlog_op_header *oph = vec->i_addr; 44 int len; 45 46 /* 47 * Always round up the length to the correct alignment so callers don't 48 * need to know anything about this log vec layout requirement. This 49 * means we have to zero the area the data to be written does not cover. 50 * This is complicated by fact the payload region is offset into the 51 * logvec region by the opheader that tracks the payload. 52 */ 53 len = xlog_calc_iovec_len(data_len); 54 if (len - data_len != 0) { 55 char *buf = vec->i_addr + sizeof(struct xlog_op_header); 56 57 memset(buf + data_len, 0, len - data_len); 58 } 59 60 /* 61 * The opheader tracks aligned payload length, whilst the logvec tracks 62 * the overall region length. 63 */ 64 oph->oh_len = cpu_to_be32(len); 65 66 len += sizeof(struct xlog_op_header); 67 lv->lv_buf_used += len; 68 lv->lv_bytes += len; 69 vec->i_len = len; 70 71 /* Catch buffer overruns */ 72 ASSERT((void *)lv->lv_buf + lv->lv_bytes <= 73 (void *)lv + lv->lv_alloc_size); 74 } 75 76 /* 77 * Copy the amount of data requested by the caller into a new log iovec. 78 */ 79 static inline void * 80 xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, 81 uint type, void *data, int len) 82 { 83 void *buf; 84 85 buf = xlog_prepare_iovec(lv, vecp, type); 86 memcpy(buf, data, len); 87 xlog_finish_iovec(lv, *vecp, len); 88 return buf; 89 } 90 91 /* 92 * By comparing each component, we don't have to worry about extra 93 * endian issues in treating two 32 bit numbers as one 64 bit number 94 */ 95 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2) 96 { 97 if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2)) 98 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999; 99 100 if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2)) 101 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999; 102 103 return 0; 104 } 105 106 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y) 107 108 /* 109 * Flags to xfs_log_force() 110 * 111 * XFS_LOG_SYNC: Synchronous force in-core log to disk 112 */ 113 #define XFS_LOG_SYNC 0x1 114 115 /* Log manager interfaces */ 116 struct xfs_mount; 117 struct xlog_in_core; 118 struct xlog_ticket; 119 struct xfs_log_item; 120 struct xfs_item_ops; 121 struct xfs_trans; 122 struct xlog; 123 124 int xfs_log_force(struct xfs_mount *mp, uint flags); 125 int xfs_log_force_seq(struct xfs_mount *mp, xfs_csn_t seq, uint flags, 126 int *log_forced); 127 int xfs_log_mount(struct xfs_mount *mp, 128 struct xfs_buftarg *log_target, 129 xfs_daddr_t start_block, 130 int num_bblocks); 131 int xfs_log_mount_finish(struct xfs_mount *mp); 132 void xfs_log_mount_cancel(struct xfs_mount *); 133 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp); 134 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp); 135 void xfs_log_space_wake(struct xfs_mount *mp); 136 int xfs_log_reserve(struct xfs_mount *mp, int length, int count, 137 struct xlog_ticket **ticket, bool permanent); 138 int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic); 139 void xfs_log_unmount(struct xfs_mount *mp); 140 bool xfs_log_writable(struct xfs_mount *mp); 141 142 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket); 143 void xfs_log_ticket_put(struct xlog_ticket *ticket); 144 145 void xlog_cil_process_committed(struct list_head *list); 146 bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip); 147 148 void xfs_log_work_queue(struct xfs_mount *mp); 149 int xfs_log_quiesce(struct xfs_mount *mp); 150 void xfs_log_clean(struct xfs_mount *mp); 151 bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t); 152 153 bool xlog_force_shutdown(struct xlog *log, uint32_t shutdown_flags); 154 155 #endif /* __XFS_LOG_H__ */ 156