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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/sysmacros.h> 32 #include <sys/cmn_err.h> 33 #include <sys/kmem.h> 34 #include <sys/thread.h> 35 #include <sys/file.h> 36 #include <sys/vfs.h> 37 #include <sys/zfs_znode.h> 38 #include <sys/zfs_dir.h> 39 #include <sys/zil.h> 40 #include <sys/zil_impl.h> 41 #include <sys/byteorder.h> 42 #include <sys/policy.h> 43 #include <sys/stat.h> 44 #include <sys/mode.h> 45 #include <sys/acl.h> 46 #include <sys/dmu.h> 47 #include <sys/spa.h> 48 #include <sys/ddi.h> 49 50 /* 51 * All the functions in this file are used to construct the log entries 52 * to record transactions. They allocate * a intent log transaction 53 * structure (itx_t) and save within it all the information necessary to 54 * possibly replay the transaction. The itx is then assigned a sequence 55 * number and inserted in the in-memory list anchored in the zilog. 56 */ 57 58 /* 59 * zfs_log_create() is used to handle TX_CREATE, TX_MKDIR and TX_MKXATTR 60 * transactions. 61 */ 62 void 63 zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, int txtype, 64 znode_t *dzp, znode_t *zp, char *name) 65 { 66 itx_t *itx; 67 uint64_t seq; 68 lr_create_t *lr; 69 size_t namesize = strlen(name) + 1; 70 71 if (zilog == NULL) 72 return; 73 74 itx = zil_itx_create(txtype, sizeof (*lr) + namesize); 75 lr = (lr_create_t *)&itx->itx_lr; 76 lr->lr_doid = dzp->z_id; 77 lr->lr_foid = zp->z_id; 78 lr->lr_mode = zp->z_phys->zp_mode; 79 lr->lr_uid = zp->z_phys->zp_uid; 80 lr->lr_gid = zp->z_phys->zp_gid; 81 lr->lr_gen = zp->z_phys->zp_gen; 82 lr->lr_crtime[0] = zp->z_phys->zp_crtime[0]; 83 lr->lr_crtime[1] = zp->z_phys->zp_crtime[1]; 84 lr->lr_rdev = zp->z_phys->zp_rdev; 85 bcopy(name, (char *)(lr + 1), namesize); 86 87 seq = zil_itx_assign(zilog, itx, tx); 88 dzp->z_last_itx = seq; 89 zp->z_last_itx = seq; 90 } 91 92 /* 93 * zfs_log_remove() handles both TX_REMOVE and TX_RMDIR transactions. 94 */ 95 void 96 zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, int txtype, 97 znode_t *dzp, char *name) 98 { 99 itx_t *itx; 100 uint64_t seq; 101 lr_remove_t *lr; 102 size_t namesize = strlen(name) + 1; 103 104 if (zilog == NULL) 105 return; 106 107 itx = zil_itx_create(txtype, sizeof (*lr) + namesize); 108 lr = (lr_remove_t *)&itx->itx_lr; 109 lr->lr_doid = dzp->z_id; 110 bcopy(name, (char *)(lr + 1), namesize); 111 112 seq = zil_itx_assign(zilog, itx, tx); 113 dzp->z_last_itx = seq; 114 } 115 116 /* 117 * zfs_log_link() handles TX_LINK transactions. 118 */ 119 void 120 zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, int txtype, 121 znode_t *dzp, znode_t *zp, char *name) 122 { 123 itx_t *itx; 124 uint64_t seq; 125 lr_link_t *lr; 126 size_t namesize = strlen(name) + 1; 127 128 if (zilog == NULL) 129 return; 130 131 itx = zil_itx_create(txtype, sizeof (*lr) + namesize); 132 lr = (lr_link_t *)&itx->itx_lr; 133 lr->lr_doid = dzp->z_id; 134 lr->lr_link_obj = zp->z_id; 135 bcopy(name, (char *)(lr + 1), namesize); 136 137 seq = zil_itx_assign(zilog, itx, tx); 138 dzp->z_last_itx = seq; 139 zp->z_last_itx = seq; 140 } 141 142 /* 143 * zfs_log_symlink() handles TX_SYMLINK transactions. 144 */ 145 void 146 zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, int txtype, 147 znode_t *dzp, znode_t *zp, char *name, char *link) 148 { 149 itx_t *itx; 150 uint64_t seq; 151 lr_create_t *lr; 152 size_t namesize = strlen(name) + 1; 153 size_t linksize = strlen(link) + 1; 154 155 if (zilog == NULL) 156 return; 157 158 itx = zil_itx_create(txtype, sizeof (*lr) + namesize + linksize); 159 lr = (lr_create_t *)&itx->itx_lr; 160 lr->lr_doid = dzp->z_id; 161 lr->lr_foid = zp->z_id; 162 lr->lr_mode = zp->z_phys->zp_mode; 163 lr->lr_uid = zp->z_phys->zp_uid; 164 lr->lr_gid = zp->z_phys->zp_gid; 165 lr->lr_gen = zp->z_phys->zp_gen; 166 lr->lr_crtime[0] = zp->z_phys->zp_crtime[0]; 167 lr->lr_crtime[1] = zp->z_phys->zp_crtime[1]; 168 bcopy(name, (char *)(lr + 1), namesize); 169 bcopy(link, (char *)(lr + 1) + namesize, linksize); 170 171 seq = zil_itx_assign(zilog, itx, tx); 172 dzp->z_last_itx = seq; 173 zp->z_last_itx = seq; 174 } 175 176 /* 177 * zfs_log_rename() handles TX_RENAME transactions. 178 */ 179 void 180 zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, int txtype, 181 znode_t *sdzp, char *sname, znode_t *tdzp, char *dname, znode_t *szp) 182 { 183 itx_t *itx; 184 uint64_t seq; 185 lr_rename_t *lr; 186 size_t snamesize = strlen(sname) + 1; 187 size_t dnamesize = strlen(dname) + 1; 188 189 if (zilog == NULL) 190 return; 191 192 itx = zil_itx_create(txtype, sizeof (*lr) + snamesize + dnamesize); 193 lr = (lr_rename_t *)&itx->itx_lr; 194 lr->lr_sdoid = sdzp->z_id; 195 lr->lr_tdoid = tdzp->z_id; 196 bcopy(sname, (char *)(lr + 1), snamesize); 197 bcopy(dname, (char *)(lr + 1) + snamesize, dnamesize); 198 199 seq = zil_itx_assign(zilog, itx, tx); 200 sdzp->z_last_itx = seq; 201 tdzp->z_last_itx = seq; 202 szp->z_last_itx = seq; 203 } 204 205 /* 206 * zfs_log_write() handles TX_WRITE transactions. 207 */ 208 ssize_t zfs_immediate_write_sz = 32768; 209 210 #define ZIL_MAX_LOG_DATA (SPA_MAXBLOCKSIZE - sizeof (zil_trailer_t) - \ 211 sizeof (lr_write_t)) 212 213 void 214 zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype, 215 znode_t *zp, offset_t off, ssize_t resid, int ioflag) 216 { 217 itx_wr_state_t write_state; 218 boolean_t slogging; 219 uintptr_t fsync_cnt; 220 221 if (zilog == NULL || zp->z_unlinked) 222 return; 223 224 /* 225 * Writes are handled in three different ways: 226 * 227 * WR_INDIRECT: 228 * If the write is greater than zfs_immediate_write_sz and there are 229 * no separate logs in this pool then later *if* we need to log the 230 * write then dmu_sync() is used to immediately write the block and 231 * its block pointer is put in the log record. 232 * WR_COPIED: 233 * If we know we'll immediately be committing the 234 * transaction (FDSYNC (O_DSYNC)), the we allocate a larger 235 * log record here for the data and copy the data in. 236 * WR_NEED_COPY: 237 * Otherwise we don't allocate a buffer, and *if* we need to 238 * flush the write later then a buffer is allocated and 239 * we retrieve the data using the dmu. 240 */ 241 slogging = spa_has_slogs(zilog->zl_spa); 242 if (resid > zfs_immediate_write_sz && !slogging) 243 write_state = WR_INDIRECT; 244 else if (ioflag & FDSYNC) 245 write_state = WR_COPIED; 246 else 247 write_state = WR_NEED_COPY; 248 249 if ((fsync_cnt = (uintptr_t)tsd_get(zfs_fsyncer_key)) != 0) { 250 (void) tsd_set(zfs_fsyncer_key, (void *)(fsync_cnt - 1)); 251 } 252 253 while (resid) { 254 itx_t *itx; 255 lr_write_t *lr; 256 ssize_t len; 257 258 /* 259 * If there are slogs and the write would overflow the largest 260 * block, then because we don't want to use the main pool 261 * to dmu_sync, we have to split the write. 262 */ 263 if (slogging && resid > ZIL_MAX_LOG_DATA) 264 len = SPA_MAXBLOCKSIZE >> 1; 265 else 266 len = resid; 267 268 itx = zil_itx_create(txtype, sizeof (*lr) + 269 (write_state == WR_COPIED ? len : 0)); 270 lr = (lr_write_t *)&itx->itx_lr; 271 if (write_state == WR_COPIED && dmu_read(zp->z_zfsvfs->z_os, 272 zp->z_id, off, len, lr + 1) != 0) { 273 kmem_free(itx, offsetof(itx_t, itx_lr) + 274 itx->itx_lr.lrc_reclen); 275 itx = zil_itx_create(txtype, sizeof (*lr)); 276 lr = (lr_write_t *)&itx->itx_lr; 277 write_state = WR_NEED_COPY; 278 } 279 280 itx->itx_wr_state = write_state; 281 lr->lr_foid = zp->z_id; 282 lr->lr_offset = off; 283 lr->lr_length = len; 284 lr->lr_blkoff = 0; 285 BP_ZERO(&lr->lr_blkptr); 286 287 itx->itx_private = zp->z_zfsvfs; 288 289 if ((zp->z_sync_cnt != 0) || (fsync_cnt != 0)) 290 itx->itx_sync = B_TRUE; 291 else 292 itx->itx_sync = B_FALSE; 293 294 zp->z_last_itx = zil_itx_assign(zilog, itx, tx); 295 296 off += len; 297 resid -= len; 298 } 299 } 300 301 /* 302 * zfs_log_truncate() handles TX_TRUNCATE transactions. 303 */ 304 void 305 zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype, 306 znode_t *zp, uint64_t off, uint64_t len) 307 { 308 itx_t *itx; 309 uint64_t seq; 310 lr_truncate_t *lr; 311 312 if (zilog == NULL || zp->z_unlinked) 313 return; 314 315 itx = zil_itx_create(txtype, sizeof (*lr)); 316 lr = (lr_truncate_t *)&itx->itx_lr; 317 lr->lr_foid = zp->z_id; 318 lr->lr_offset = off; 319 lr->lr_length = len; 320 321 itx->itx_sync = (zp->z_sync_cnt != 0); 322 seq = zil_itx_assign(zilog, itx, tx); 323 zp->z_last_itx = seq; 324 } 325 326 /* 327 * zfs_log_setattr() handles TX_SETATTR transactions. 328 */ 329 void 330 zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype, 331 znode_t *zp, vattr_t *vap, uint_t mask_applied) 332 { 333 itx_t *itx; 334 uint64_t seq; 335 lr_setattr_t *lr; 336 337 if (zilog == NULL || zp->z_unlinked) 338 return; 339 340 itx = zil_itx_create(txtype, sizeof (*lr)); 341 lr = (lr_setattr_t *)&itx->itx_lr; 342 lr->lr_foid = zp->z_id; 343 lr->lr_mask = (uint64_t)mask_applied; 344 lr->lr_mode = (uint64_t)vap->va_mode; 345 lr->lr_uid = (uint64_t)vap->va_uid; 346 lr->lr_gid = (uint64_t)vap->va_gid; 347 lr->lr_size = (uint64_t)vap->va_size; 348 ZFS_TIME_ENCODE(&vap->va_atime, lr->lr_atime); 349 ZFS_TIME_ENCODE(&vap->va_mtime, lr->lr_mtime); 350 351 itx->itx_sync = (zp->z_sync_cnt != 0); 352 seq = zil_itx_assign(zilog, itx, tx); 353 zp->z_last_itx = seq; 354 } 355 356 /* 357 * zfs_log_acl() handles TX_ACL transactions. 358 */ 359 void 360 zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, int txtype, 361 znode_t *zp, int aclcnt, ace_t *z_ace) 362 { 363 itx_t *itx; 364 uint64_t seq; 365 lr_acl_t *lr; 366 367 if (zilog == NULL || zp->z_unlinked) 368 return; 369 370 itx = zil_itx_create(txtype, sizeof (*lr) + aclcnt * sizeof (ace_t)); 371 lr = (lr_acl_t *)&itx->itx_lr; 372 lr->lr_foid = zp->z_id; 373 lr->lr_aclcnt = (uint64_t)aclcnt; 374 bcopy(z_ace, (ace_t *)(lr + 1), aclcnt * sizeof (ace_t)); 375 376 itx->itx_sync = (zp->z_sync_cnt != 0); 377 seq = zil_itx_assign(zilog, itx, tx); 378 zp->z_last_itx = seq; 379 } 380