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 xfs_log_vec *lv_next; /* next lv in build list */ 13 int lv_niovecs; /* number of iovecs in lv */ 14 struct xfs_log_iovec *lv_iovecp; /* iovec array */ 15 struct xfs_log_item *lv_item; /* owner */ 16 char *lv_buf; /* formatted buffer */ 17 int lv_bytes; /* accounted space in buffer */ 18 int lv_buf_len; /* aligned size of buffer */ 19 int lv_size; /* size of allocated lv */ 20 }; 21 22 #define XFS_LOG_VEC_ORDERED (-1) 23 24 static inline void * 25 xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, 26 uint type) 27 { 28 struct xfs_log_iovec *vec = *vecp; 29 30 if (vec) { 31 ASSERT(vec - lv->lv_iovecp < lv->lv_niovecs); 32 vec++; 33 } else { 34 vec = &lv->lv_iovecp[0]; 35 } 36 37 vec->i_type = type; 38 vec->i_addr = lv->lv_buf + lv->lv_buf_len; 39 40 ASSERT(IS_ALIGNED((unsigned long)vec->i_addr, sizeof(uint64_t))); 41 42 *vecp = vec; 43 return vec->i_addr; 44 } 45 46 /* 47 * We need to make sure the next buffer is naturally aligned for the biggest 48 * basic data type we put into it. We already accounted for this padding when 49 * sizing the buffer. 50 * 51 * However, this padding does not get written into the log, and hence we have to 52 * track the space used by the log vectors separately to prevent log space hangs 53 * due to inaccurate accounting (i.e. a leak) of the used log space through the 54 * CIL context ticket. 55 */ 56 static inline void 57 xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, int len) 58 { 59 lv->lv_buf_len += round_up(len, sizeof(uint64_t)); 60 lv->lv_bytes += len; 61 vec->i_len = len; 62 } 63 64 static inline void * 65 xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, 66 uint type, void *data, int len) 67 { 68 void *buf; 69 70 buf = xlog_prepare_iovec(lv, vecp, type); 71 memcpy(buf, data, len); 72 xlog_finish_iovec(lv, *vecp, len); 73 return buf; 74 } 75 76 /* 77 * By comparing each component, we don't have to worry about extra 78 * endian issues in treating two 32 bit numbers as one 64 bit number 79 */ 80 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2) 81 { 82 if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2)) 83 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999; 84 85 if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2)) 86 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999; 87 88 return 0; 89 } 90 91 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y) 92 93 /* 94 * Flags to xfs_log_force() 95 * 96 * XFS_LOG_SYNC: Synchronous force in-core log to disk 97 */ 98 #define XFS_LOG_SYNC 0x1 99 100 /* Log manager interfaces */ 101 struct xfs_mount; 102 struct xlog_in_core; 103 struct xlog_ticket; 104 struct xfs_log_item; 105 struct xfs_item_ops; 106 struct xfs_trans; 107 108 int xfs_log_force(struct xfs_mount *mp, uint flags); 109 int xfs_log_force_lsn(struct xfs_mount *mp, xfs_lsn_t lsn, uint flags, 110 int *log_forced); 111 int xfs_log_mount(struct xfs_mount *mp, 112 struct xfs_buftarg *log_target, 113 xfs_daddr_t start_block, 114 int num_bblocks); 115 int xfs_log_mount_finish(struct xfs_mount *mp); 116 void xfs_log_mount_cancel(struct xfs_mount *); 117 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp); 118 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp); 119 void xfs_log_space_wake(struct xfs_mount *mp); 120 void xfs_log_release_iclog(struct xlog_in_core *iclog); 121 int xfs_log_reserve(struct xfs_mount *mp, 122 int length, 123 int count, 124 struct xlog_ticket **ticket, 125 uint8_t clientid, 126 bool permanent); 127 int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic); 128 void xfs_log_unmount(struct xfs_mount *mp); 129 int xfs_log_force_umount(struct xfs_mount *mp, int logerror); 130 131 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket); 132 void xfs_log_ticket_put(struct xlog_ticket *ticket); 133 134 void xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp, 135 xfs_lsn_t *commit_lsn, bool regrant); 136 void xlog_cil_process_committed(struct list_head *list); 137 bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip); 138 139 void xfs_log_work_queue(struct xfs_mount *mp); 140 void xfs_log_quiesce(struct xfs_mount *mp); 141 bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t); 142 bool xfs_log_in_recovery(struct xfs_mount *); 143 144 xfs_lsn_t xlog_grant_push_threshold(struct xlog *log, int need_bytes); 145 146 #endif /* __XFS_LOG_H__ */ 147