1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_ZIL_H 27 #define _SYS_ZIL_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/types.h> 32 #include <sys/spa.h> 33 #include <sys/zio.h> 34 #include <sys/dmu.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 /* 41 * Intent log format: 42 * 43 * Each objset has its own intent log. The log header (zil_header_t) 44 * for objset N's intent log is kept in the Nth object of the SPA's 45 * intent_log objset. The log header points to a chain of log blocks, 46 * each of which contains log records (i.e., transactions) followed by 47 * a log block trailer (zil_trailer_t). The format of a log record 48 * depends on the record (or transaction) type, but all records begin 49 * with a common structure that defines the type, length, and txg. 50 */ 51 52 /* 53 * Intent log header - this on disk structure holds fields to manage 54 * the log. All fields are 64 bit to easily handle cross architectures. 55 */ 56 typedef struct zil_header { 57 uint64_t zh_claim_txg; /* txg in which log blocks were claimed */ 58 uint64_t zh_replay_seq; /* highest replayed sequence number */ 59 blkptr_t zh_log; /* log chain */ 60 uint64_t zh_claim_seq; /* highest claimed sequence number */ 61 uint64_t zh_pad[5]; 62 } zil_header_t; 63 64 /* 65 * Log block trailer - structure at the end of the header and each log block 66 * 67 * The zit_bt contains a zbt_cksum which for the intent log is 68 * the sequence number of this log block. A seq of 0 is invalid. 69 * The zbt_cksum is checked by the SPA against the sequence 70 * number passed in the blk_cksum field of the blkptr_t 71 */ 72 typedef struct zil_trailer { 73 uint64_t zit_pad; 74 blkptr_t zit_next_blk; /* next block in chain */ 75 uint64_t zit_nused; /* bytes in log block used */ 76 zio_block_tail_t zit_bt; /* block trailer */ 77 } zil_trailer_t; 78 79 #define ZIL_MIN_BLKSZ 4096 80 #define ZIL_MAX_BLKSZ SPA_MAXBLOCKSIZE 81 #define ZIL_BLK_DATA_SZ(lwb) ((lwb)->lwb_sz - sizeof (zil_trailer_t)) 82 83 /* 84 * The words of a log block checksum. 85 */ 86 #define ZIL_ZC_GUID_0 0 87 #define ZIL_ZC_GUID_1 1 88 #define ZIL_ZC_OBJSET 2 89 #define ZIL_ZC_SEQ 3 90 91 /* 92 * Intent log transaction types and record structures 93 */ 94 #define TX_CREATE 1 /* Create file */ 95 #define TX_MKDIR 2 /* Make directory */ 96 #define TX_MKXATTR 3 /* Make XATTR directory */ 97 #define TX_SYMLINK 4 /* Create symbolic link to a file */ 98 #define TX_REMOVE 5 /* Remove file */ 99 #define TX_RMDIR 6 /* Remove directory */ 100 #define TX_LINK 7 /* Create hard link to a file */ 101 #define TX_RENAME 8 /* Rename a file */ 102 #define TX_WRITE 9 /* File write */ 103 #define TX_TRUNCATE 10 /* Truncate a file */ 104 #define TX_SETATTR 11 /* Set file attributes */ 105 #define TX_ACL 12 /* Set acl */ 106 #define TX_MAX_TYPE 13 /* Max transaction type */ 107 108 /* 109 * Format of log records. 110 * The fields are carefully defined to allow them to be aligned 111 * and sized the same on sparc & intel architectures. 112 * Each log record has a common structure at the beginning. 113 */ 114 typedef struct { /* common log record header */ 115 uint64_t lrc_txtype; /* intent log transaction type */ 116 uint64_t lrc_reclen; /* transaction record length */ 117 uint64_t lrc_txg; /* dmu transaction group number */ 118 uint64_t lrc_seq; /* intent log sequence number */ 119 } lr_t; 120 121 typedef struct { 122 lr_t lr_common; /* common portion of log record */ 123 uint64_t lr_doid; /* object id of directory */ 124 uint64_t lr_foid; /* object id of created file object */ 125 uint64_t lr_mode; /* mode of object */ 126 uint64_t lr_uid; /* uid of object */ 127 uint64_t lr_gid; /* gid of object */ 128 uint64_t lr_gen; /* generation (txg of creation) */ 129 uint64_t lr_crtime[2]; /* creation time */ 130 uint64_t lr_rdev; /* rdev of object to create */ 131 /* name of object to create follows this */ 132 /* for symlinks, link content follows name */ 133 } lr_create_t; 134 135 typedef struct { 136 lr_t lr_common; /* common portion of log record */ 137 uint64_t lr_doid; /* obj id of directory */ 138 /* name of object to remove follows this */ 139 } lr_remove_t; 140 141 typedef struct { 142 lr_t lr_common; /* common portion of log record */ 143 uint64_t lr_doid; /* obj id of directory */ 144 uint64_t lr_link_obj; /* obj id of link */ 145 /* name of object to link follows this */ 146 } lr_link_t; 147 148 typedef struct { 149 lr_t lr_common; /* common portion of log record */ 150 uint64_t lr_sdoid; /* obj id of source directory */ 151 uint64_t lr_tdoid; /* obj id of target directory */ 152 /* 2 strings: names of source and destination follow this */ 153 } lr_rename_t; 154 155 typedef struct { 156 lr_t lr_common; /* common portion of log record */ 157 uint64_t lr_foid; /* file object to write */ 158 uint64_t lr_offset; /* offset to write to */ 159 uint64_t lr_length; /* user data length to write */ 160 uint64_t lr_blkoff; /* offset represented by lr_blkptr */ 161 blkptr_t lr_blkptr; /* spa block pointer for replay */ 162 /* write data will follow for small writes */ 163 } lr_write_t; 164 165 typedef struct { 166 lr_t lr_common; /* common portion of log record */ 167 uint64_t lr_foid; /* object id of file to truncate */ 168 uint64_t lr_offset; /* offset to truncate from */ 169 uint64_t lr_length; /* length to truncate */ 170 } lr_truncate_t; 171 172 typedef struct { 173 lr_t lr_common; /* common portion of log record */ 174 uint64_t lr_foid; /* file object to change attributes */ 175 uint64_t lr_mask; /* mask of attributes to set */ 176 uint64_t lr_mode; /* mode to set */ 177 uint64_t lr_uid; /* uid to set */ 178 uint64_t lr_gid; /* gid to set */ 179 uint64_t lr_size; /* size to set */ 180 uint64_t lr_atime[2]; /* access time */ 181 uint64_t lr_mtime[2]; /* modification time */ 182 } lr_setattr_t; 183 184 typedef struct { 185 lr_t lr_common; /* common portion of log record */ 186 uint64_t lr_foid; /* obj id of file */ 187 uint64_t lr_aclcnt; /* number of acl entries */ 188 /* lr_aclcnt number of ace_t entries follow this */ 189 } lr_acl_t; 190 191 /* 192 * ZIL structure definitions, interface function prototype and globals. 193 */ 194 195 /* 196 * ZFS intent log transaction structure 197 */ 198 typedef enum { 199 WR_INDIRECT, /* indirect - a large write (dmu_sync() data */ 200 /* and put blkptr in log, rather than actual data) */ 201 WR_COPIED, /* immediate - data is copied into lr_write_t */ 202 WR_NEED_COPY, /* immediate - data needs to be copied if pushed */ 203 } itx_wr_state_t; 204 205 typedef struct itx { 206 list_node_t itx_node; /* linkage on zl_itx_list */ 207 void *itx_private; /* type-specific opaque data */ 208 itx_wr_state_t itx_wr_state; /* write state */ 209 lr_t itx_lr; /* common part of log record */ 210 /* followed by type-specific part of lr_xx_t and its immediate data */ 211 } itx_t; 212 213 typedef void zil_parse_blk_func_t(zilog_t *zilog, blkptr_t *bp, void *arg, 214 uint64_t txg); 215 typedef void zil_parse_lr_func_t(zilog_t *zilog, lr_t *lr, void *arg, 216 uint64_t txg); 217 typedef int zil_replay_func_t(); 218 typedef int zil_get_data_t(void *arg, lr_write_t *lr, char *dbuf); 219 220 extern uint64_t zil_parse(zilog_t *zilog, zil_parse_blk_func_t *parse_blk_func, 221 zil_parse_lr_func_t *parse_lr_func, void *arg, uint64_t txg); 222 223 extern void zil_init(void); 224 extern void zil_fini(void); 225 226 extern zilog_t *zil_alloc(objset_t *os, zil_header_t *zh_phys); 227 extern void zil_free(zilog_t *zilog); 228 229 extern zilog_t *zil_open(objset_t *os, zil_get_data_t *get_data); 230 extern void zil_close(zilog_t *zilog); 231 232 extern void zil_replay(objset_t *os, void *arg, uint64_t *txgp, 233 zil_replay_func_t *replay_func[TX_MAX_TYPE], void (*rm_wait)(void *)); 234 extern void zil_destroy(zilog_t *zilog, boolean_t keep_first); 235 236 extern itx_t *zil_itx_create(int txtype, size_t lrsize); 237 extern uint64_t zil_itx_assign(zilog_t *zilog, itx_t *itx, dmu_tx_t *tx); 238 239 extern void zil_commit(zilog_t *zilog, uint64_t seq, int ioflag); 240 241 extern void zil_claim(char *osname, void *txarg); 242 extern void zil_sync(zilog_t *zilog, dmu_tx_t *tx); 243 extern void zil_clean(zilog_t *zilog); 244 extern int zil_is_committed(zilog_t *zilog); 245 246 extern int zil_suspend(zilog_t *zilog); 247 extern void zil_resume(zilog_t *zilog); 248 249 extern int zil_disable; 250 extern int zil_always; 251 extern int zil_purge; 252 253 #ifdef __cplusplus 254 } 255 #endif 256 257 #endif /* _SYS_ZIL_H */ 258