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_log_vec { 10 struct xfs_log_vec *lv_next; /* next lv in build list */ 11 int lv_niovecs; /* number of iovecs in lv */ 12 struct xfs_log_iovec *lv_iovecp; /* iovec array */ 13 struct xfs_log_item *lv_item; /* owner */ 14 char *lv_buf; /* formatted buffer */ 15 int lv_bytes; /* accounted space in buffer */ 16 int lv_buf_len; /* aligned size of buffer */ 17 int lv_size; /* size of allocated lv */ 18 }; 19 20 #define XFS_LOG_VEC_ORDERED (-1) 21 22 static inline void * 23 xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, 24 uint type) 25 { 26 struct xfs_log_iovec *vec = *vecp; 27 28 if (vec) { 29 ASSERT(vec - lv->lv_iovecp < lv->lv_niovecs); 30 vec++; 31 } else { 32 vec = &lv->lv_iovecp[0]; 33 } 34 35 vec->i_type = type; 36 vec->i_addr = lv->lv_buf + lv->lv_buf_len; 37 38 ASSERT(IS_ALIGNED((unsigned long)vec->i_addr, sizeof(uint64_t))); 39 40 *vecp = vec; 41 return vec->i_addr; 42 } 43 44 /* 45 * We need to make sure the next buffer is naturally aligned for the biggest 46 * basic data type we put into it. We already accounted for this padding when 47 * sizing the buffer. 48 * 49 * However, this padding does not get written into the log, and hence we have to 50 * track the space used by the log vectors separately to prevent log space hangs 51 * due to inaccurate accounting (i.e. a leak) of the used log space through the 52 * CIL context ticket. 53 */ 54 static inline void 55 xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, int len) 56 { 57 lv->lv_buf_len += round_up(len, sizeof(uint64_t)); 58 lv->lv_bytes += len; 59 vec->i_len = len; 60 } 61 62 static inline void * 63 xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp, 64 uint type, void *data, int len) 65 { 66 void *buf; 67 68 buf = xlog_prepare_iovec(lv, vecp, type); 69 memcpy(buf, data, len); 70 xlog_finish_iovec(lv, *vecp, len); 71 return buf; 72 } 73 74 /* 75 * Structure used to pass callback function and the function's argument 76 * to the log manager. 77 */ 78 typedef struct xfs_log_callback { 79 struct xfs_log_callback *cb_next; 80 void (*cb_func)(void *, int); 81 void *cb_arg; 82 } xfs_log_callback_t; 83 84 /* 85 * By comparing each component, we don't have to worry about extra 86 * endian issues in treating two 32 bit numbers as one 64 bit number 87 */ 88 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2) 89 { 90 if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2)) 91 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999; 92 93 if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2)) 94 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999; 95 96 return 0; 97 } 98 99 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y) 100 101 /* 102 * Flags to xfs_log_force() 103 * 104 * XFS_LOG_SYNC: Synchronous force in-core log to disk 105 */ 106 #define XFS_LOG_SYNC 0x1 107 108 /* Log manager interfaces */ 109 struct xfs_mount; 110 struct xlog_in_core; 111 struct xlog_ticket; 112 struct xfs_log_item; 113 struct xfs_item_ops; 114 struct xfs_trans; 115 116 xfs_lsn_t xfs_log_done(struct xfs_mount *mp, 117 struct xlog_ticket *ticket, 118 struct xlog_in_core **iclog, 119 bool regrant); 120 int xfs_log_force(struct xfs_mount *mp, uint flags); 121 int xfs_log_force_lsn(struct xfs_mount *mp, xfs_lsn_t lsn, uint flags, 122 int *log_forced); 123 int xfs_log_mount(struct xfs_mount *mp, 124 struct xfs_buftarg *log_target, 125 xfs_daddr_t start_block, 126 int num_bblocks); 127 int xfs_log_mount_finish(struct xfs_mount *mp); 128 int xfs_log_mount_cancel(struct xfs_mount *); 129 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp); 130 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp); 131 void xfs_log_space_wake(struct xfs_mount *mp); 132 int xfs_log_notify(struct xlog_in_core *iclog, 133 struct xfs_log_callback *callback_entry); 134 int xfs_log_release_iclog(struct xfs_mount *mp, 135 struct xlog_in_core *iclog); 136 int xfs_log_reserve(struct xfs_mount *mp, 137 int length, 138 int count, 139 struct xlog_ticket **ticket, 140 uint8_t clientid, 141 bool permanent); 142 int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic); 143 void xfs_log_unmount(struct xfs_mount *mp); 144 int xfs_log_force_umount(struct xfs_mount *mp, int logerror); 145 146 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket); 147 void xfs_log_ticket_put(struct xlog_ticket *ticket); 148 149 void xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp, 150 xfs_lsn_t *commit_lsn, bool regrant); 151 bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip); 152 153 void xfs_log_work_queue(struct xfs_mount *mp); 154 void xfs_log_quiesce(struct xfs_mount *mp); 155 bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t); 156 157 #endif /* __XFS_LOG_H__ */ 158