Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
| 18 | #ifndef __XFS_LOG_PRIV_H__ |
| 19 | #define __XFS_LOG_PRIV_H__ |
| 20 | |
| 21 | struct xfs_buf; |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 22 | struct xlog; |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 23 | struct xlog_ticket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | struct xfs_mount; |
| 25 | |
| 26 | /* |
| 27 | * Macros, structures, prototypes for internal log manager use. |
| 28 | */ |
| 29 | |
| 30 | #define XLOG_MIN_ICLOGS 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #define XLOG_MAX_ICLOGS 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #define XLOG_HEADER_MAGIC_NUM 0xFEEDbabe /* Invalid cycle number */ |
| 33 | #define XLOG_VERSION_1 1 |
| 34 | #define XLOG_VERSION_2 2 /* Large IClogs, Log sunit */ |
| 35 | #define XLOG_VERSION_OKBITS (XLOG_VERSION_1 | XLOG_VERSION_2) |
Eric Sandeen | dcb3b83 | 2007-08-16 16:25:33 +1000 | [diff] [blame] | 36 | #define XLOG_MIN_RECORD_BSIZE (16*1024) /* eventually 32k */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #define XLOG_BIG_RECORD_BSIZE (32*1024) /* 32k buffers */ |
| 38 | #define XLOG_MAX_RECORD_BSIZE (256*1024) |
| 39 | #define XLOG_HEADER_CYCLE_SIZE (32*1024) /* cycle data in header */ |
Eric Sandeen | dcb3b83 | 2007-08-16 16:25:33 +1000 | [diff] [blame] | 40 | #define XLOG_MIN_RECORD_BSHIFT 14 /* 16384 == 1 << 14 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #define XLOG_BIG_RECORD_BSHIFT 15 /* 32k == 1 << 15 */ |
| 42 | #define XLOG_MAX_RECORD_BSHIFT 18 /* 256k == 1 << 18 */ |
| 43 | #define XLOG_BTOLSUNIT(log, b) (((b)+(log)->l_mp->m_sb.sb_logsunit-1) / \ |
| 44 | (log)->l_mp->m_sb.sb_logsunit) |
| 45 | #define XLOG_LSUNITTOB(log, su) ((su) * (log)->l_mp->m_sb.sb_logsunit) |
| 46 | |
| 47 | #define XLOG_HEADER_SIZE 512 |
| 48 | |
| 49 | #define XLOG_REC_SHIFT(log) \ |
Eric Sandeen | 6211870 | 2008-03-06 13:44:28 +1100 | [diff] [blame] | 50 | BTOBB(1 << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) |
| 52 | #define XLOG_TOTAL_REC_SHIFT(log) \ |
Eric Sandeen | 6211870 | 2008-03-06 13:44:28 +1100 | [diff] [blame] | 53 | BTOBB(XLOG_MAX_ICLOGS << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT)) |
| 55 | |
Christoph Hellwig | 03bea6f | 2007-10-12 10:58:05 +1000 | [diff] [blame] | 56 | static inline xfs_lsn_t xlog_assign_lsn(uint cycle, uint block) |
| 57 | { |
| 58 | return ((xfs_lsn_t)cycle << 32) | block; |
| 59 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Christoph Hellwig | 03bea6f | 2007-10-12 10:58:05 +1000 | [diff] [blame] | 61 | static inline uint xlog_get_cycle(char *ptr) |
| 62 | { |
Christoph Hellwig | b53e675 | 2007-10-12 10:59:34 +1000 | [diff] [blame] | 63 | if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM) |
| 64 | return be32_to_cpu(*((__be32 *)ptr + 1)); |
Christoph Hellwig | 03bea6f | 2007-10-12 10:58:05 +1000 | [diff] [blame] | 65 | else |
Christoph Hellwig | b53e675 | 2007-10-12 10:59:34 +1000 | [diff] [blame] | 66 | return be32_to_cpu(*(__be32 *)ptr); |
Christoph Hellwig | 03bea6f | 2007-10-12 10:58:05 +1000 | [diff] [blame] | 67 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | #define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1) |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #ifdef __KERNEL__ |
| 72 | |
| 73 | /* |
| 74 | * get client id from packed copy. |
| 75 | * |
| 76 | * this hack is here because the xlog_pack code copies four bytes |
| 77 | * of xlog_op_header containing the fields oh_clientid, oh_flags |
| 78 | * and oh_res2 into the packed copy. |
| 79 | * |
| 80 | * later on this four byte chunk is treated as an int and the |
| 81 | * client id is pulled out. |
| 82 | * |
| 83 | * this has endian issues, of course. |
| 84 | */ |
Christoph Hellwig | b53e675 | 2007-10-12 10:59:34 +1000 | [diff] [blame] | 85 | static inline uint xlog_get_client_id(__be32 i) |
Christoph Hellwig | 03bea6f | 2007-10-12 10:58:05 +1000 | [diff] [blame] | 86 | { |
Christoph Hellwig | b53e675 | 2007-10-12 10:59:34 +1000 | [diff] [blame] | 87 | return be32_to_cpu(i) >> 24; |
Christoph Hellwig | 03bea6f | 2007-10-12 10:58:05 +1000 | [diff] [blame] | 88 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | /* |
| 91 | * In core log state |
| 92 | */ |
| 93 | #define XLOG_STATE_ACTIVE 0x0001 /* Current IC log being written to */ |
| 94 | #define XLOG_STATE_WANT_SYNC 0x0002 /* Want to sync this iclog; no more writes */ |
| 95 | #define XLOG_STATE_SYNCING 0x0004 /* This IC log is syncing */ |
| 96 | #define XLOG_STATE_DONE_SYNC 0x0008 /* Done syncing to disk */ |
| 97 | #define XLOG_STATE_DO_CALLBACK \ |
| 98 | 0x0010 /* Process callback functions */ |
| 99 | #define XLOG_STATE_CALLBACK 0x0020 /* Callback functions now */ |
| 100 | #define XLOG_STATE_DIRTY 0x0040 /* Dirty IC log, not ready for ACTIVE status*/ |
| 101 | #define XLOG_STATE_IOERROR 0x0080 /* IO error happened in sync'ing log */ |
| 102 | #define XLOG_STATE_ALL 0x7FFF /* All possible valid flags */ |
| 103 | #define XLOG_STATE_NOTUSED 0x8000 /* This IC log not being used */ |
| 104 | #endif /* __KERNEL__ */ |
| 105 | |
| 106 | /* |
| 107 | * Flags to log operation header |
| 108 | * |
| 109 | * The first write of a new transaction will be preceded with a start |
| 110 | * record, XLOG_START_TRANS. Once a transaction is committed, a commit |
| 111 | * record is written, XLOG_COMMIT_TRANS. If a single region can not fit into |
| 112 | * the remainder of the current active in-core log, it is split up into |
| 113 | * multiple regions. Each partial region will be marked with a |
| 114 | * XLOG_CONTINUE_TRANS until the last one, which gets marked with XLOG_END_TRANS. |
| 115 | * |
| 116 | */ |
| 117 | #define XLOG_START_TRANS 0x01 /* Start a new transaction */ |
| 118 | #define XLOG_COMMIT_TRANS 0x02 /* Commit this transaction */ |
| 119 | #define XLOG_CONTINUE_TRANS 0x04 /* Cont this trans into new region */ |
| 120 | #define XLOG_WAS_CONT_TRANS 0x08 /* Cont this trans into new region */ |
| 121 | #define XLOG_END_TRANS 0x10 /* End a continued transaction */ |
| 122 | #define XLOG_UNMOUNT_TRANS 0x20 /* Unmount a filesystem transaction */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | #ifdef __KERNEL__ |
| 125 | /* |
| 126 | * Flags to log ticket |
| 127 | */ |
| 128 | #define XLOG_TIC_INITED 0x1 /* has been initialized */ |
| 129 | #define XLOG_TIC_PERM_RESERV 0x2 /* permanent reservation */ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 130 | |
| 131 | #define XLOG_TIC_FLAGS \ |
| 132 | { XLOG_TIC_INITED, "XLOG_TIC_INITED" }, \ |
Dave Chinner | 1054794 | 2010-12-21 12:02:25 +1100 | [diff] [blame] | 133 | { XLOG_TIC_PERM_RESERV, "XLOG_TIC_PERM_RESERV" } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | #endif /* __KERNEL__ */ |
| 136 | |
| 137 | #define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */ |
| 138 | |
| 139 | /* |
| 140 | * Flags for log structure |
| 141 | */ |
| 142 | #define XLOG_CHKSUM_MISMATCH 0x1 /* used only during recovery */ |
| 143 | #define XLOG_ACTIVE_RECOVERY 0x2 /* in the middle of recovery */ |
| 144 | #define XLOG_RECOVERY_NEEDED 0x4 /* log was recovered */ |
| 145 | #define XLOG_IO_ERROR 0x8 /* log hit an I/O error, and being |
| 146 | shutdown */ |
Dave Chinner | da8a1a4 | 2011-04-08 12:45:07 +1000 | [diff] [blame] | 147 | #define XLOG_TAIL_WARN 0x10 /* log tail verify warning issued */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Christoph Hellwig | 97d3ac7 | 2011-04-24 19:06:16 +0000 | [diff] [blame] | 149 | typedef __uint32_t xlog_tid_t; |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | #ifdef __KERNEL__ |
| 152 | /* |
| 153 | * Below are states for covering allocation transactions. |
| 154 | * By covering, we mean changing the h_tail_lsn in the last on-disk |
| 155 | * log write such that no allocation transactions will be re-done during |
| 156 | * recovery after a system crash. Recovery starts at the last on-disk |
| 157 | * log write. |
| 158 | * |
| 159 | * These states are used to insert dummy log entries to cover |
| 160 | * space allocation transactions which can undo non-transactional changes |
| 161 | * after a crash. Writes to a file with space |
| 162 | * already allocated do not result in any transactions. Allocations |
| 163 | * might include space beyond the EOF. So if we just push the EOF a |
| 164 | * little, the last transaction for the file could contain the wrong |
| 165 | * size. If there is no file system activity, after an allocation |
| 166 | * transaction, and the system crashes, the allocation transaction |
| 167 | * will get replayed and the file will be truncated. This could |
| 168 | * be hours/days/... after the allocation occurred. |
| 169 | * |
| 170 | * The fix for this is to do two dummy transactions when the |
| 171 | * system is idle. We need two dummy transaction because the h_tail_lsn |
| 172 | * in the log record header needs to point beyond the last possible |
| 173 | * non-dummy transaction. The first dummy changes the h_tail_lsn to |
| 174 | * the first transaction before the dummy. The second dummy causes |
| 175 | * h_tail_lsn to point to the first dummy. Recovery starts at h_tail_lsn. |
| 176 | * |
| 177 | * These dummy transactions get committed when everything |
| 178 | * is idle (after there has been some activity). |
| 179 | * |
| 180 | * There are 5 states used to control this. |
| 181 | * |
| 182 | * IDLE -- no logging has been done on the file system or |
| 183 | * we are done covering previous transactions. |
| 184 | * NEED -- logging has occurred and we need a dummy transaction |
| 185 | * when the log becomes idle. |
| 186 | * DONE -- we were in the NEED state and have committed a dummy |
| 187 | * transaction. |
| 188 | * NEED2 -- we detected that a dummy transaction has gone to the |
| 189 | * on disk log with no other transactions. |
| 190 | * DONE2 -- we committed a dummy transaction when in the NEED2 state. |
| 191 | * |
| 192 | * There are two places where we switch states: |
| 193 | * |
| 194 | * 1.) In xfs_sync, when we detect an idle log and are in NEED or NEED2. |
| 195 | * We commit the dummy transaction and switch to DONE or DONE2, |
| 196 | * respectively. In all other states, we don't do anything. |
| 197 | * |
| 198 | * 2.) When we finish writing the on-disk log (xlog_state_clean_log). |
| 199 | * |
| 200 | * No matter what state we are in, if this isn't the dummy |
| 201 | * transaction going out, the next state is NEED. |
| 202 | * So, if we aren't in the DONE or DONE2 states, the next state |
| 203 | * is NEED. We can't be finishing a write of the dummy record |
| 204 | * unless it was committed and the state switched to DONE or DONE2. |
| 205 | * |
| 206 | * If we are in the DONE state and this was a write of the |
| 207 | * dummy transaction, we move to NEED2. |
| 208 | * |
| 209 | * If we are in the DONE2 state and this was a write of the |
| 210 | * dummy transaction, we move to IDLE. |
| 211 | * |
| 212 | * |
| 213 | * Writing only one dummy transaction can get appended to |
| 214 | * one file space allocation. When this happens, the log recovery |
| 215 | * code replays the space allocation and a file could be truncated. |
| 216 | * This is why we have the NEED2 and DONE2 states before going idle. |
| 217 | */ |
| 218 | |
| 219 | #define XLOG_STATE_COVER_IDLE 0 |
| 220 | #define XLOG_STATE_COVER_NEED 1 |
| 221 | #define XLOG_STATE_COVER_DONE 2 |
| 222 | #define XLOG_STATE_COVER_NEED2 3 |
| 223 | #define XLOG_STATE_COVER_DONE2 4 |
| 224 | |
| 225 | #define XLOG_COVER_OPS 5 |
| 226 | |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 227 | |
| 228 | /* Ticket reservation region accounting */ |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 229 | #define XLOG_TIC_LEN_MAX 15 |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 230 | |
| 231 | /* |
| 232 | * Reservation region |
| 233 | * As would be stored in xfs_log_iovec but without the i_addr which |
| 234 | * we don't care about. |
| 235 | */ |
| 236 | typedef struct xlog_res { |
Tim Shimmin | 1259845 | 2006-01-11 21:02:47 +1100 | [diff] [blame] | 237 | uint r_len; /* region length :4 */ |
| 238 | uint r_type; /* region's transaction type :4 */ |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 239 | } xlog_res_t; |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | typedef struct xlog_ticket { |
Dave Chinner | 1054794 | 2010-12-21 12:02:25 +1100 | [diff] [blame] | 242 | struct list_head t_queue; /* reserve/write queue */ |
Christoph Hellwig | 14a7235 | 2012-02-20 02:31:24 +0000 | [diff] [blame] | 243 | struct task_struct *t_task; /* task that owns this ticket */ |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 244 | xlog_tid_t t_tid; /* transaction identifier : 4 */ |
Dave Chinner | cc09c0d | 2008-11-17 17:37:10 +1100 | [diff] [blame] | 245 | atomic_t t_ref; /* ticket reference count : 4 */ |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 246 | int t_curr_res; /* current reservation in bytes : 4 */ |
| 247 | int t_unit_res; /* unit reservation in bytes : 4 */ |
| 248 | char t_ocnt; /* original count : 1 */ |
| 249 | char t_cnt; /* current count : 1 */ |
| 250 | char t_clientid; /* who does this belong to; : 1 */ |
| 251 | char t_flags; /* properties of reservation : 1 */ |
| 252 | uint t_trans_type; /* transaction type : 4 */ |
| 253 | |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 254 | /* reservation array fields */ |
| 255 | uint t_res_num; /* num in array : 4 */ |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 256 | uint t_res_num_ophdrs; /* num op hdrs : 4 */ |
| 257 | uint t_res_arr_sum; /* array sum : 4 */ |
| 258 | uint t_res_o_flow; /* sum overflow : 4 */ |
Tim Shimmin | 1259845 | 2006-01-11 21:02:47 +1100 | [diff] [blame] | 259 | xlog_res_t t_res_arr[XLOG_TIC_LEN_MAX]; /* array of res : 8 * 15 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } xlog_ticket_t; |
Tim Shimmin | 7e9c639 | 2005-09-02 16:42:05 +1000 | [diff] [blame] | 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | #endif |
| 263 | |
| 264 | |
| 265 | typedef struct xlog_op_header { |
Christoph Hellwig | 67fcb7b | 2007-10-12 10:58:59 +1000 | [diff] [blame] | 266 | __be32 oh_tid; /* transaction id of operation : 4 b */ |
| 267 | __be32 oh_len; /* bytes in data region : 4 b */ |
| 268 | __u8 oh_clientid; /* who sent me this : 1 b */ |
| 269 | __u8 oh_flags; /* : 1 b */ |
| 270 | __u16 oh_res2; /* 32 bit align : 2 b */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } xlog_op_header_t; |
| 272 | |
| 273 | |
| 274 | /* valid values for h_fmt */ |
| 275 | #define XLOG_FMT_UNKNOWN 0 |
| 276 | #define XLOG_FMT_LINUX_LE 1 |
| 277 | #define XLOG_FMT_LINUX_BE 2 |
| 278 | #define XLOG_FMT_IRIX_BE 3 |
| 279 | |
| 280 | /* our fmt */ |
Nathan Scott | f016bad | 2005-09-08 15:30:05 +1000 | [diff] [blame] | 281 | #ifdef XFS_NATIVE_HOST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | #define XLOG_FMT XLOG_FMT_LINUX_BE |
| 283 | #else |
Nathan Scott | f016bad | 2005-09-08 15:30:05 +1000 | [diff] [blame] | 284 | #define XLOG_FMT XLOG_FMT_LINUX_LE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | #endif |
| 286 | |
| 287 | typedef struct xlog_rec_header { |
Christoph Hellwig | b53e675 | 2007-10-12 10:59:34 +1000 | [diff] [blame] | 288 | __be32 h_magicno; /* log record (LR) identifier : 4 */ |
| 289 | __be32 h_cycle; /* write cycle of log : 4 */ |
| 290 | __be32 h_version; /* LR version : 4 */ |
| 291 | __be32 h_len; /* len in bytes; should be 64-bit aligned: 4 */ |
| 292 | __be64 h_lsn; /* lsn of this LR : 8 */ |
| 293 | __be64 h_tail_lsn; /* lsn of 1st LR w/ buffers not committed: 8 */ |
| 294 | __be32 h_chksum; /* may not be used; non-zero if used : 4 */ |
| 295 | __be32 h_prev_block; /* block number to previous LR : 4 */ |
| 296 | __be32 h_num_logops; /* number of log operations in this LR : 4 */ |
| 297 | __be32 h_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | /* new fields */ |
Christoph Hellwig | b53e675 | 2007-10-12 10:59:34 +1000 | [diff] [blame] | 299 | __be32 h_fmt; /* format of log record : 4 */ |
| 300 | uuid_t h_fs_uuid; /* uuid of FS : 16 */ |
| 301 | __be32 h_size; /* iclog size : 4 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | } xlog_rec_header_t; |
| 303 | |
| 304 | typedef struct xlog_rec_ext_header { |
Christoph Hellwig | b53e675 | 2007-10-12 10:59:34 +1000 | [diff] [blame] | 305 | __be32 xh_cycle; /* write cycle of log : 4 */ |
| 306 | __be32 xh_cycle_data[XLOG_HEADER_CYCLE_SIZE / BBSIZE]; /* : 256 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } xlog_rec_ext_header_t; |
| 308 | |
| 309 | #ifdef __KERNEL__ |
Christoph Hellwig | b28708d | 2008-11-28 14:23:38 +1100 | [diff] [blame] | 310 | |
| 311 | /* |
| 312 | * Quite misnamed, because this union lays out the actual on-disk log buffer. |
| 313 | */ |
| 314 | typedef union xlog_in_core2 { |
| 315 | xlog_rec_header_t hic_header; |
| 316 | xlog_rec_ext_header_t hic_xheader; |
| 317 | char hic_sector[XLOG_HEADER_SIZE]; |
| 318 | } xlog_in_core_2_t; |
| 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | /* |
| 321 | * - A log record header is 512 bytes. There is plenty of room to grow the |
| 322 | * xlog_rec_header_t into the reserved space. |
| 323 | * - ic_data follows, so a write to disk can start at the beginning of |
| 324 | * the iclog. |
David Chinner | 12017fa | 2008-08-13 16:34:31 +1000 | [diff] [blame] | 325 | * - ic_forcewait is used to implement synchronous forcing of the iclog to disk. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | * - ic_next is the pointer to the next iclog in the ring. |
| 327 | * - ic_bp is a pointer to the buffer used to write this incore log to disk. |
| 328 | * - ic_log is a pointer back to the global log structure. |
| 329 | * - ic_callback is a linked list of callback function/argument pairs to be |
| 330 | * called after an iclog finishes writing. |
| 331 | * - ic_size is the full size of the header plus data. |
| 332 | * - ic_offset is the current number of bytes written to in this iclog. |
| 333 | * - ic_refcnt is bumped when someone is writing to the log. |
| 334 | * - ic_state is the state of the iclog. |
David Chinner | 114d23a | 2008-04-10 12:18:39 +1000 | [diff] [blame] | 335 | * |
| 336 | * Because of cacheline contention on large machines, we need to separate |
| 337 | * various resources onto different cachelines. To start with, make the |
| 338 | * structure cacheline aligned. The following fields can be contended on |
| 339 | * by independent processes: |
| 340 | * |
| 341 | * - ic_callback_* |
| 342 | * - ic_refcnt |
| 343 | * - fields protected by the global l_icloglock |
| 344 | * |
| 345 | * so we need to ensure that these fields are located in separate cachelines. |
| 346 | * We'll put all the read-only and l_icloglock fields in the first cacheline, |
| 347 | * and move everything else out to subsequent cachelines. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | */ |
Christoph Hellwig | b28708d | 2008-11-28 14:23:38 +1100 | [diff] [blame] | 349 | typedef struct xlog_in_core { |
Dave Chinner | eb40a87 | 2010-12-21 12:09:01 +1100 | [diff] [blame] | 350 | wait_queue_head_t ic_force_wait; |
| 351 | wait_queue_head_t ic_write_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | struct xlog_in_core *ic_next; |
| 353 | struct xlog_in_core *ic_prev; |
| 354 | struct xfs_buf *ic_bp; |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 355 | struct xlog *ic_log; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | int ic_size; |
| 357 | int ic_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | int ic_bwritecnt; |
Christoph Hellwig | a568778 | 2009-02-09 08:37:39 +0100 | [diff] [blame] | 359 | unsigned short ic_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | char *ic_datap; /* pointer to iclog data */ |
David Chinner | 114d23a | 2008-04-10 12:18:39 +1000 | [diff] [blame] | 361 | |
| 362 | /* Callback structures need their own cacheline */ |
| 363 | spinlock_t ic_callback_lock ____cacheline_aligned_in_smp; |
| 364 | xfs_log_callback_t *ic_callback; |
| 365 | xfs_log_callback_t **ic_callback_tail; |
| 366 | |
| 367 | /* reference counts need their own cacheline */ |
| 368 | atomic_t ic_refcnt ____cacheline_aligned_in_smp; |
Christoph Hellwig | b28708d | 2008-11-28 14:23:38 +1100 | [diff] [blame] | 369 | xlog_in_core_2_t *ic_data; |
| 370 | #define ic_header ic_data->hic_header |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } xlog_in_core_t; |
| 372 | |
| 373 | /* |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 374 | * The CIL context is used to aggregate per-transaction details as well be |
| 375 | * passed to the iclog for checkpoint post-commit processing. After being |
| 376 | * passed to the iclog, another context needs to be allocated for tracking the |
| 377 | * next set of transactions to be aggregated into a checkpoint. |
| 378 | */ |
| 379 | struct xfs_cil; |
| 380 | |
| 381 | struct xfs_cil_ctx { |
| 382 | struct xfs_cil *cil; |
| 383 | xfs_lsn_t sequence; /* chkpt sequence # */ |
| 384 | xfs_lsn_t start_lsn; /* first LSN of chkpt commit */ |
| 385 | xfs_lsn_t commit_lsn; /* chkpt commit record lsn */ |
| 386 | struct xlog_ticket *ticket; /* chkpt ticket */ |
| 387 | int nvecs; /* number of regions */ |
| 388 | int space_used; /* aggregate size of regions */ |
| 389 | struct list_head busy_extents; /* busy extents in chkpt */ |
| 390 | struct xfs_log_vec *lv_chain; /* logvecs being pushed */ |
| 391 | xfs_log_callback_t log_cb; /* completion callback hook. */ |
| 392 | struct list_head committing; /* ctx committing list */ |
| 393 | }; |
| 394 | |
| 395 | /* |
| 396 | * Committed Item List structure |
| 397 | * |
| 398 | * This structure is used to track log items that have been committed but not |
| 399 | * yet written into the log. It is used only when the delayed logging mount |
| 400 | * option is enabled. |
| 401 | * |
| 402 | * This structure tracks the list of committing checkpoint contexts so |
| 403 | * we can avoid the problem of having to hold out new transactions during a |
| 404 | * flush until we have a the commit record LSN of the checkpoint. We can |
| 405 | * traverse the list of committing contexts in xlog_cil_push_lsn() to find a |
| 406 | * sequence match and extract the commit LSN directly from there. If the |
| 407 | * checkpoint is still in the process of committing, we can block waiting for |
| 408 | * the commit LSN to be determined as well. This should make synchronous |
| 409 | * operations almost as efficient as the old logging methods. |
| 410 | */ |
| 411 | struct xfs_cil { |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 412 | struct xlog *xc_log; |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 413 | struct list_head xc_cil; |
| 414 | spinlock_t xc_cil_lock; |
| 415 | struct xfs_cil_ctx *xc_ctx; |
| 416 | struct rw_semaphore xc_ctx_lock; |
| 417 | struct list_head xc_committing; |
Dave Chinner | eb40a87 | 2010-12-21 12:09:01 +1100 | [diff] [blame] | 418 | wait_queue_head_t xc_commit_wait; |
Dave Chinner | a44f13e | 2010-08-24 11:40:03 +1000 | [diff] [blame] | 419 | xfs_lsn_t xc_current_sequence; |
Dave Chinner | 4c2d542 | 2012-04-23 17:54:32 +1000 | [diff] [blame] | 420 | struct work_struct xc_push_work; |
| 421 | xfs_lsn_t xc_push_seq; |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 422 | }; |
| 423 | |
| 424 | /* |
Dave Chinner | 8016867 | 2010-09-24 18:13:44 +1000 | [diff] [blame] | 425 | * The amount of log space we allow the CIL to aggregate is difficult to size. |
| 426 | * Whatever we choose, we have to make sure we can get a reservation for the |
| 427 | * log space effectively, that it is large enough to capture sufficient |
| 428 | * relogging to reduce log buffer IO significantly, but it is not too large for |
| 429 | * the log or induces too much latency when writing out through the iclogs. We |
| 430 | * track both space consumed and the number of vectors in the checkpoint |
| 431 | * context, so we need to decide which to use for limiting. |
Dave Chinner | df80615 | 2010-05-17 15:52:13 +1000 | [diff] [blame] | 432 | * |
| 433 | * Every log buffer we write out during a push needs a header reserved, which |
| 434 | * is at least one sector and more for v2 logs. Hence we need a reservation of |
| 435 | * at least 512 bytes per 32k of log space just for the LR headers. That means |
| 436 | * 16KB of reservation per megabyte of delayed logging space we will consume, |
| 437 | * plus various headers. The number of headers will vary based on the num of |
| 438 | * io vectors, so limiting on a specific number of vectors is going to result |
| 439 | * in transactions of varying size. IOWs, it is more consistent to track and |
| 440 | * limit space consumed in the log rather than by the number of objects being |
| 441 | * logged in order to prevent checkpoint ticket overruns. |
| 442 | * |
| 443 | * Further, use of static reservations through the log grant mechanism is |
| 444 | * problematic. It introduces a lot of complexity (e.g. reserve grant vs write |
| 445 | * grant) and a significant deadlock potential because regranting write space |
| 446 | * can block on log pushes. Hence if we have to regrant log space during a log |
| 447 | * push, we can deadlock. |
| 448 | * |
| 449 | * However, we can avoid this by use of a dynamic "reservation stealing" |
| 450 | * technique during transaction commit whereby unused reservation space in the |
| 451 | * transaction ticket is transferred to the CIL ctx commit ticket to cover the |
| 452 | * space needed by the checkpoint transaction. This means that we never need to |
| 453 | * specifically reserve space for the CIL checkpoint transaction, nor do we |
| 454 | * need to regrant space once the checkpoint completes. This also means the |
| 455 | * checkpoint transaction ticket is specific to the checkpoint context, rather |
| 456 | * than the CIL itself. |
| 457 | * |
Dave Chinner | 8016867 | 2010-09-24 18:13:44 +1000 | [diff] [blame] | 458 | * With dynamic reservations, we can effectively make up arbitrary limits for |
| 459 | * the checkpoint size so long as they don't violate any other size rules. |
| 460 | * Recovery imposes a rule that no transaction exceed half the log, so we are |
| 461 | * limited by that. Furthermore, the log transaction reservation subsystem |
| 462 | * tries to keep 25% of the log free, so we need to keep below that limit or we |
| 463 | * risk running out of free log space to start any new transactions. |
| 464 | * |
| 465 | * In order to keep background CIL push efficient, we will set a lower |
| 466 | * threshold at which background pushing is attempted without blocking current |
| 467 | * transaction commits. A separate, higher bound defines when CIL pushes are |
| 468 | * enforced to ensure we stay within our maximum checkpoint size bounds. |
| 469 | * threshold, yet give us plenty of space for aggregation on large logs. |
Dave Chinner | df80615 | 2010-05-17 15:52:13 +1000 | [diff] [blame] | 470 | */ |
Dave Chinner | 8016867 | 2010-09-24 18:13:44 +1000 | [diff] [blame] | 471 | #define XLOG_CIL_SPACE_LIMIT(log) (log->l_logsize >> 3) |
| 472 | #define XLOG_CIL_HARD_SPACE_LIMIT(log) (3 * (log->l_logsize >> 4)) |
Dave Chinner | df80615 | 2010-05-17 15:52:13 +1000 | [diff] [blame] | 473 | |
| 474 | /* |
Christoph Hellwig | 2849696 | 2012-02-20 02:31:25 +0000 | [diff] [blame] | 475 | * ticket grant locks, queues and accounting have their own cachlines |
| 476 | * as these are quite hot and can be operated on concurrently. |
| 477 | */ |
| 478 | struct xlog_grant_head { |
| 479 | spinlock_t lock ____cacheline_aligned_in_smp; |
| 480 | struct list_head waiters; |
| 481 | atomic64_t grant; |
| 482 | }; |
| 483 | |
| 484 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | * The reservation head lsn is not made up of a cycle number and block number. |
| 486 | * Instead, it uses a cycle number and byte number. Logs don't expect to |
| 487 | * overflow 31 bits worth of byte offset, so using a byte number will mean |
| 488 | * that round off problems won't occur when releasing partial reservations. |
| 489 | */ |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 490 | typedef struct xlog { |
David Chinner | 4679b2d | 2008-04-10 12:18:54 +1000 | [diff] [blame] | 491 | /* The following fields don't need locking */ |
| 492 | struct xfs_mount *l_mp; /* mount point */ |
David Chinner | a9c21c1 | 2008-10-30 17:39:35 +1100 | [diff] [blame] | 493 | struct xfs_ail *l_ailp; /* AIL log is working with */ |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 494 | struct xfs_cil *l_cilp; /* CIL log is working with */ |
David Chinner | 4679b2d | 2008-04-10 12:18:54 +1000 | [diff] [blame] | 495 | struct xfs_buf *l_xbuf; /* extra buffer for log |
| 496 | * wrapping */ |
| 497 | struct xfs_buftarg *l_targ; /* buftarg of log */ |
| 498 | uint l_flags; |
| 499 | uint l_quotaoffs_flag; /* XFS_DQ_*, for QUOTAOFFs */ |
Christoph Hellwig | d5689ea | 2010-12-01 22:06:22 +0000 | [diff] [blame] | 500 | struct list_head *l_buf_cancel_table; |
David Chinner | 4679b2d | 2008-04-10 12:18:54 +1000 | [diff] [blame] | 501 | int l_iclog_hsize; /* size of iclog header */ |
| 502 | int l_iclog_heads; /* # of iclog header sectors */ |
Alex Elder | 48389ef | 2010-04-20 17:10:21 +1000 | [diff] [blame] | 503 | uint l_sectBBsize; /* sector size in BBs (2^n) */ |
David Chinner | 4679b2d | 2008-04-10 12:18:54 +1000 | [diff] [blame] | 504 | int l_iclog_size; /* size of log in bytes */ |
| 505 | int l_iclog_size_log; /* log power size of log */ |
| 506 | int l_iclog_bufs; /* number of iclog buffers */ |
| 507 | xfs_daddr_t l_logBBstart; /* start block of log */ |
| 508 | int l_logsize; /* size of log in bytes */ |
| 509 | int l_logBBsize; /* size of log in BB chunks */ |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* The following block of fields are changed while holding icloglock */ |
Dave Chinner | eb40a87 | 2010-12-21 12:09:01 +1100 | [diff] [blame] | 512 | wait_queue_head_t l_flush_wait ____cacheline_aligned_in_smp; |
Matthew Wilcox | d748c62 | 2008-05-19 16:34:27 +1000 | [diff] [blame] | 513 | /* waiting for iclog flush */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | int l_covered_state;/* state of "covering disk |
| 515 | * log entries" */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | xlog_in_core_t *l_iclog; /* head log queue */ |
Eric Sandeen | b22cd72c | 2007-10-11 17:37:10 +1000 | [diff] [blame] | 517 | spinlock_t l_icloglock; /* grab to change iclog state */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | int l_curr_cycle; /* Cycle number of log writes */ |
| 519 | int l_prev_cycle; /* Cycle number before last |
| 520 | * block increment */ |
| 521 | int l_curr_block; /* current logical log block */ |
| 522 | int l_prev_block; /* previous logical log block */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Dave Chinner | 84f3c68 | 2010-12-03 22:11:29 +1100 | [diff] [blame] | 524 | /* |
Dave Chinner | 1c3cb9e | 2010-12-21 12:28:39 +1100 | [diff] [blame] | 525 | * l_last_sync_lsn and l_tail_lsn are atomics so they can be set and |
| 526 | * read without needing to hold specific locks. To avoid operations |
| 527 | * contending with other hot objects, place each of them on a separate |
| 528 | * cacheline. |
Dave Chinner | 84f3c68 | 2010-12-03 22:11:29 +1100 | [diff] [blame] | 529 | */ |
| 530 | /* lsn of last LR on disk */ |
| 531 | atomic64_t l_last_sync_lsn ____cacheline_aligned_in_smp; |
Dave Chinner | 1c3cb9e | 2010-12-21 12:28:39 +1100 | [diff] [blame] | 532 | /* lsn of 1st LR with unflushed * buffers */ |
| 533 | atomic64_t l_tail_lsn ____cacheline_aligned_in_smp; |
Dave Chinner | 84f3c68 | 2010-12-03 22:11:29 +1100 | [diff] [blame] | 534 | |
Christoph Hellwig | 2849696 | 2012-02-20 02:31:25 +0000 | [diff] [blame] | 535 | struct xlog_grant_head l_reserve_head; |
| 536 | struct xlog_grant_head l_write_head; |
Dave Chinner | 3f16b98 | 2010-12-21 12:29:01 +1100 | [diff] [blame] | 537 | |
David Chinner | 4679b2d | 2008-04-10 12:18:54 +1000 | [diff] [blame] | 538 | /* The following field are used for debugging; need to hold icloglock */ |
| 539 | #ifdef DEBUG |
| 540 | char *l_iclog_bak[XLOG_MAX_ICLOGS]; |
| 541 | #endif |
| 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } xlog_t; |
| 544 | |
Christoph Hellwig | d5689ea | 2010-12-01 22:06:22 +0000 | [diff] [blame] | 545 | #define XLOG_BUF_CANCEL_BUCKET(log, blkno) \ |
| 546 | ((log)->l_buf_cancel_table + ((__uint64_t)blkno % XLOG_BC_TABLE_SIZE)) |
| 547 | |
Nathan Scott | cfcbbbd | 2005-11-02 15:12:04 +1100 | [diff] [blame] | 548 | #define XLOG_FORCED_SHUTDOWN(log) ((log)->l_flags & XLOG_IO_ERROR) |
| 549 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | /* common routines */ |
Eric Sandeen | 65be605 | 2006-01-11 15:34:19 +1100 | [diff] [blame] | 551 | extern int xlog_recover(xlog_t *log); |
Christoph Hellwig | 4249023 | 2008-08-13 16:49:32 +1000 | [diff] [blame] | 552 | extern int xlog_recover_finish(xlog_t *log); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | extern void xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 555 | extern kmem_zone_t *xfs_log_ticket_zone; |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 556 | struct xlog_ticket * |
| 557 | xlog_ticket_alloc( |
| 558 | struct xlog *log, |
| 559 | int unit_bytes, |
| 560 | int count, |
| 561 | char client, |
| 562 | bool permanent, |
| 563 | xfs_km_flags_t alloc_flags); |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 564 | |
David Chinner | eb01c9c | 2008-04-10 12:18:46 +1000 | [diff] [blame] | 565 | |
Christoph Hellwig | e6b1f27 | 2010-03-23 11:47:38 +1100 | [diff] [blame] | 566 | static inline void |
| 567 | xlog_write_adv_cnt(void **ptr, int *len, int *off, size_t bytes) |
| 568 | { |
| 569 | *ptr += bytes; |
| 570 | *len -= bytes; |
| 571 | *off += bytes; |
| 572 | } |
| 573 | |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 574 | void xlog_print_tic_res(struct xfs_mount *mp, struct xlog_ticket *ticket); |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 575 | int |
| 576 | xlog_write( |
| 577 | struct xlog *log, |
| 578 | struct xfs_log_vec *log_vector, |
| 579 | struct xlog_ticket *tic, |
| 580 | xfs_lsn_t *start_lsn, |
| 581 | struct xlog_in_core **commit_iclog, |
| 582 | uint flags); |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 583 | |
| 584 | /* |
Dave Chinner | 1c3cb9e | 2010-12-21 12:28:39 +1100 | [diff] [blame] | 585 | * When we crack an atomic LSN, we sample it first so that the value will not |
| 586 | * change while we are cracking it into the component values. This means we |
| 587 | * will always get consistent component values to work from. This should always |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 588 | * be used to sample and crack LSNs that are stored and updated in atomic |
Dave Chinner | 1c3cb9e | 2010-12-21 12:28:39 +1100 | [diff] [blame] | 589 | * variables. |
| 590 | */ |
| 591 | static inline void |
| 592 | xlog_crack_atomic_lsn(atomic64_t *lsn, uint *cycle, uint *block) |
| 593 | { |
| 594 | xfs_lsn_t val = atomic64_read(lsn); |
| 595 | |
| 596 | *cycle = CYCLE_LSN(val); |
| 597 | *block = BLOCK_LSN(val); |
| 598 | } |
| 599 | |
| 600 | /* |
| 601 | * Calculate and assign a value to an atomic LSN variable from component pieces. |
| 602 | */ |
| 603 | static inline void |
| 604 | xlog_assign_atomic_lsn(atomic64_t *lsn, uint cycle, uint block) |
| 605 | { |
| 606 | atomic64_set(lsn, xlog_assign_lsn(cycle, block)); |
| 607 | } |
| 608 | |
| 609 | /* |
Dave Chinner | d0eb2f3 | 2010-12-21 12:29:14 +1100 | [diff] [blame] | 610 | * When we crack the grant head, we sample it first so that the value will not |
Dave Chinner | a69ed03 | 2010-12-21 12:08:20 +1100 | [diff] [blame] | 611 | * change while we are cracking it into the component values. This means we |
| 612 | * will always get consistent component values to work from. |
| 613 | */ |
| 614 | static inline void |
Dave Chinner | d0eb2f3 | 2010-12-21 12:29:14 +1100 | [diff] [blame] | 615 | xlog_crack_grant_head_val(int64_t val, int *cycle, int *space) |
Dave Chinner | a69ed03 | 2010-12-21 12:08:20 +1100 | [diff] [blame] | 616 | { |
Dave Chinner | a69ed03 | 2010-12-21 12:08:20 +1100 | [diff] [blame] | 617 | *cycle = val >> 32; |
| 618 | *space = val & 0xffffffff; |
| 619 | } |
| 620 | |
| 621 | static inline void |
Dave Chinner | d0eb2f3 | 2010-12-21 12:29:14 +1100 | [diff] [blame] | 622 | xlog_crack_grant_head(atomic64_t *head, int *cycle, int *space) |
| 623 | { |
| 624 | xlog_crack_grant_head_val(atomic64_read(head), cycle, space); |
| 625 | } |
| 626 | |
| 627 | static inline int64_t |
| 628 | xlog_assign_grant_head_val(int cycle, int space) |
| 629 | { |
| 630 | return ((int64_t)cycle << 32) | space; |
| 631 | } |
| 632 | |
| 633 | static inline void |
Dave Chinner | c8a09ff | 2010-12-04 00:02:40 +1100 | [diff] [blame] | 634 | xlog_assign_grant_head(atomic64_t *head, int cycle, int space) |
Dave Chinner | a69ed03 | 2010-12-21 12:08:20 +1100 | [diff] [blame] | 635 | { |
Dave Chinner | d0eb2f3 | 2010-12-21 12:29:14 +1100 | [diff] [blame] | 636 | atomic64_set(head, xlog_assign_grant_head_val(cycle, space)); |
Dave Chinner | a69ed03 | 2010-12-21 12:08:20 +1100 | [diff] [blame] | 637 | } |
| 638 | |
| 639 | /* |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 640 | * Committed Item List interfaces |
| 641 | */ |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 642 | int |
| 643 | xlog_cil_init(struct xlog *log); |
| 644 | void |
| 645 | xlog_cil_init_post_recovery(struct xlog *log); |
| 646 | void |
| 647 | xlog_cil_destroy(struct xlog *log); |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 648 | |
Dave Chinner | a44f13e | 2010-08-24 11:40:03 +1000 | [diff] [blame] | 649 | /* |
| 650 | * CIL force routines |
| 651 | */ |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 652 | xfs_lsn_t |
| 653 | xlog_cil_force_lsn( |
| 654 | struct xlog *log, |
| 655 | xfs_lsn_t sequence); |
Dave Chinner | a44f13e | 2010-08-24 11:40:03 +1000 | [diff] [blame] | 656 | |
| 657 | static inline void |
Mark Tinguely | f7bdf03 | 2012-06-14 09:22:15 -0500 | [diff] [blame] | 658 | xlog_cil_force(struct xlog *log) |
Dave Chinner | a44f13e | 2010-08-24 11:40:03 +1000 | [diff] [blame] | 659 | { |
| 660 | xlog_cil_force_lsn(log, log->l_cilp->xc_current_sequence); |
| 661 | } |
Dave Chinner | 71e330b | 2010-05-21 14:37:18 +1000 | [diff] [blame] | 662 | |
Tim Shimmin | 955e47a | 2006-09-28 11:04:16 +1000 | [diff] [blame] | 663 | /* |
| 664 | * Unmount record type is used as a pseudo transaction type for the ticket. |
| 665 | * It's value must be outside the range of XFS_TRANS_* values. |
| 666 | */ |
| 667 | #define XLOG_UNMOUNT_REC_TYPE (-1U) |
| 668 | |
Dave Chinner | eb40a87 | 2010-12-21 12:09:01 +1100 | [diff] [blame] | 669 | /* |
| 670 | * Wrapper function for waiting on a wait queue serialised against wakeups |
| 671 | * by a spinlock. This matches the semantics of all the wait queues used in the |
| 672 | * log code. |
| 673 | */ |
| 674 | static inline void xlog_wait(wait_queue_head_t *wq, spinlock_t *lock) |
| 675 | { |
| 676 | DECLARE_WAITQUEUE(wait, current); |
| 677 | |
| 678 | add_wait_queue_exclusive(wq, &wait); |
| 679 | __set_current_state(TASK_UNINTERRUPTIBLE); |
| 680 | spin_unlock(lock); |
| 681 | schedule(); |
| 682 | remove_wait_queue(wq, &wait); |
| 683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | #endif /* __KERNEL__ */ |
| 685 | |
| 686 | #endif /* __XFS_LOG_PRIV_H__ */ |