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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_FS_ZFS_ZNODE_H 27 #define _SYS_FS_ZFS_ZNODE_H 28 29 #ifdef _KERNEL 30 #include <sys/isa_defs.h> 31 #include <sys/types32.h> 32 #include <sys/attr.h> 33 #include <sys/list.h> 34 #include <sys/dmu.h> 35 #include <sys/zfs_vfsops.h> 36 #include <sys/rrwlock.h> 37 #endif 38 #include <sys/zfs_acl.h> 39 #include <sys/zil.h> 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 /* 46 * Additional file level attributes, that are stored 47 * in the upper half of zp_flags 48 */ 49 #define ZFS_READONLY 0x0000000100000000 50 #define ZFS_HIDDEN 0x0000000200000000 51 #define ZFS_SYSTEM 0x0000000400000000 52 #define ZFS_ARCHIVE 0x0000000800000000 53 #define ZFS_IMMUTABLE 0x0000001000000000 54 #define ZFS_NOUNLINK 0x0000002000000000 55 #define ZFS_APPENDONLY 0x0000004000000000 56 #define ZFS_NODUMP 0x0000008000000000 57 #define ZFS_OPAQUE 0x0000010000000000 58 #define ZFS_AV_QUARANTINED 0x0000020000000000 59 #define ZFS_AV_MODIFIED 0x0000040000000000 60 61 #define ZFS_ATTR_SET(zp, attr, value) \ 62 { \ 63 if (value) \ 64 zp->z_phys->zp_flags |= attr; \ 65 else \ 66 zp->z_phys->zp_flags &= ~attr; \ 67 } 68 69 /* 70 * Define special zfs pflags 71 */ 72 #define ZFS_XATTR 0x1 /* is an extended attribute */ 73 #define ZFS_INHERIT_ACE 0x2 /* ace has inheritable ACEs */ 74 #define ZFS_ACL_TRIVIAL 0x4 /* files ACL is trivial */ 75 #define ZFS_ACL_OBJ_ACE 0x8 /* ACL has CMPLX Object ACE */ 76 #define ZFS_ACL_PROTECTED 0x10 /* ACL protected */ 77 #define ZFS_ACL_DEFAULTED 0x20 /* ACL should be defaulted */ 78 #define ZFS_ACL_AUTO_INHERIT 0x40 /* ACL should be inherited */ 79 #define ZFS_BONUS_SCANSTAMP 0x80 /* Scanstamp in bonus area */ 80 81 /* 82 * Is ID ephemeral? 83 */ 84 #define IS_EPHEMERAL(x) (x > MAXUID) 85 86 /* 87 * Should we use FUIDs? 88 */ 89 #define USE_FUIDS(version, os) (version >= ZPL_VERSION_FUID &&\ 90 spa_version(dmu_objset_spa(os)) >= SPA_VERSION_FUID) 91 92 #define MASTER_NODE_OBJ 1 93 94 /* 95 * Special attributes for master node. 96 */ 97 #define ZFS_FSID "FSID" 98 #define ZFS_UNLINKED_SET "DELETE_QUEUE" 99 #define ZFS_ROOT_OBJ "ROOT" 100 #define ZPL_VERSION_STR "VERSION" 101 #define ZFS_FUID_TABLES "FUID" 102 #define ZFS_SHARES_DIR "SHARES" 103 104 #define ZFS_MAX_BLOCKSIZE (SPA_MAXBLOCKSIZE) 105 106 /* Path component length */ 107 /* 108 * The generic fs code uses MAXNAMELEN to represent 109 * what the largest component length is. Unfortunately, 110 * this length includes the terminating NULL. ZFS needs 111 * to tell the users via pathconf() and statvfs() what the 112 * true maximum length of a component is, excluding the NULL. 113 */ 114 #define ZFS_MAXNAMELEN (MAXNAMELEN - 1) 115 116 /* 117 * Convert mode bits (zp_mode) to BSD-style DT_* values for storing in 118 * the directory entries. 119 */ 120 #define IFTODT(mode) (((mode) & S_IFMT) >> 12) 121 122 /* 123 * The directory entry has the type (currently unused on Solaris) in the 124 * top 4 bits, and the object number in the low 48 bits. The "middle" 125 * 12 bits are unused. 126 */ 127 #define ZFS_DIRENT_TYPE(de) BF64_GET(de, 60, 4) 128 #define ZFS_DIRENT_OBJ(de) BF64_GET(de, 0, 48) 129 130 /* 131 * This is the persistent portion of the znode. It is stored 132 * in the "bonus buffer" of the file. Short symbolic links 133 * are also stored in the bonus buffer. 134 */ 135 typedef struct znode_phys { 136 uint64_t zp_atime[2]; /* 0 - last file access time */ 137 uint64_t zp_mtime[2]; /* 16 - last file modification time */ 138 uint64_t zp_ctime[2]; /* 32 - last file change time */ 139 uint64_t zp_crtime[2]; /* 48 - creation time */ 140 uint64_t zp_gen; /* 64 - generation (txg of creation) */ 141 uint64_t zp_mode; /* 72 - file mode bits */ 142 uint64_t zp_size; /* 80 - size of file */ 143 uint64_t zp_parent; /* 88 - directory parent (`..') */ 144 uint64_t zp_links; /* 96 - number of links to file */ 145 uint64_t zp_xattr; /* 104 - DMU object for xattrs */ 146 uint64_t zp_rdev; /* 112 - dev_t for VBLK & VCHR files */ 147 uint64_t zp_flags; /* 120 - persistent flags */ 148 uint64_t zp_uid; /* 128 - file owner */ 149 uint64_t zp_gid; /* 136 - owning group */ 150 uint64_t zp_zap; /* 144 - extra attributes */ 151 uint64_t zp_pad[3]; /* 152 - future */ 152 zfs_acl_phys_t zp_acl; /* 176 - 263 ACL */ 153 /* 154 * Data may pad out any remaining bytes in the znode buffer, eg: 155 * 156 * |<---------------------- dnode_phys (512) ------------------------>| 157 * |<-- dnode (192) --->|<----------- "bonus" buffer (320) ---------->| 158 * |<---- znode (264) ---->|<---- data (56) ---->| 159 * 160 * At present, we use this space for the following: 161 * - symbolic links 162 * - 32-byte anti-virus scanstamp (regular files only) 163 */ 164 } znode_phys_t; 165 166 /* 167 * Directory entry locks control access to directory entries. 168 * They are used to protect creates, deletes, and renames. 169 * Each directory znode has a mutex and a list of locked names. 170 */ 171 #ifdef _KERNEL 172 typedef struct zfs_dirlock { 173 char *dl_name; /* directory entry being locked */ 174 uint32_t dl_sharecnt; /* 0 if exclusive, > 0 if shared */ 175 uint16_t dl_namesize; /* set if dl_name was allocated */ 176 kcondvar_t dl_cv; /* wait for entry to be unlocked */ 177 struct znode *dl_dzp; /* directory znode */ 178 struct zfs_dirlock *dl_next; /* next in z_dirlocks list */ 179 } zfs_dirlock_t; 180 181 typedef struct znode { 182 struct zfsvfs *z_zfsvfs; 183 vnode_t *z_vnode; 184 uint64_t z_id; /* object ID for this znode */ 185 kmutex_t z_lock; /* znode modification lock */ 186 krwlock_t z_parent_lock; /* parent lock for directories */ 187 krwlock_t z_name_lock; /* "master" lock for dirent locks */ 188 zfs_dirlock_t *z_dirlocks; /* directory entry lock list */ 189 kmutex_t z_range_lock; /* protects changes to z_range_avl */ 190 avl_tree_t z_range_avl; /* avl tree of file range locks */ 191 uint8_t z_unlinked; /* file has been unlinked */ 192 uint8_t z_atime_dirty; /* atime needs to be synced */ 193 uint8_t z_zn_prefetch; /* Prefetch znodes? */ 194 uint_t z_blksz; /* block size in bytes */ 195 uint_t z_seq; /* modification sequence number */ 196 uint64_t z_mapcnt; /* number of pages mapped to file */ 197 uint64_t z_last_itx; /* last ZIL itx on this znode */ 198 uint64_t z_gen; /* generation (same as zp_gen) */ 199 uint32_t z_sync_cnt; /* synchronous open count */ 200 kmutex_t z_acl_lock; /* acl data lock */ 201 list_node_t z_link_node; /* all znodes in fs link */ 202 /* 203 * These are dmu managed fields. 204 */ 205 znode_phys_t *z_phys; /* pointer to persistent znode */ 206 dmu_buf_t *z_dbuf; /* buffer containing the z_phys */ 207 } znode_t; 208 209 210 /* 211 * Range locking rules 212 * -------------------- 213 * 1. When truncating a file (zfs_create, zfs_setattr, zfs_space) the whole 214 * file range needs to be locked as RL_WRITER. Only then can the pages be 215 * freed etc and zp_size reset. zp_size must be set within range lock. 216 * 2. For writes and punching holes (zfs_write & zfs_space) just the range 217 * being written or freed needs to be locked as RL_WRITER. 218 * Multiple writes at the end of the file must coordinate zp_size updates 219 * to ensure data isn't lost. A compare and swap loop is currently used 220 * to ensure the file size is at least the offset last written. 221 * 3. For reads (zfs_read, zfs_get_data & zfs_putapage) just the range being 222 * read needs to be locked as RL_READER. A check against zp_size can then 223 * be made for reading beyond end of file. 224 */ 225 226 /* 227 * Convert between znode pointers and vnode pointers 228 */ 229 #define ZTOV(ZP) ((ZP)->z_vnode) 230 #define VTOZ(VP) ((znode_t *)(VP)->v_data) 231 232 /* 233 * ZFS_ENTER() is called on entry to each ZFS vnode and vfs operation. 234 * ZFS_EXIT() must be called before exitting the vop. 235 * ZFS_VERIFY_ZP() verifies the znode is valid. 236 */ 237 #define ZFS_ENTER(zfsvfs) \ 238 { \ 239 rrw_enter(&(zfsvfs)->z_teardown_lock, RW_READER, FTAG); \ 240 if ((zfsvfs)->z_unmounted) { \ 241 ZFS_EXIT(zfsvfs); \ 242 return (EIO); \ 243 } \ 244 } 245 246 #define ZFS_EXIT(zfsvfs) rrw_exit(&(zfsvfs)->z_teardown_lock, FTAG) 247 248 #define ZFS_VERIFY_ZP(zp) \ 249 if ((zp)->z_dbuf == NULL) { \ 250 ZFS_EXIT((zp)->z_zfsvfs); \ 251 return (EIO); \ 252 } \ 253 254 /* 255 * Macros for dealing with dmu_buf_hold 256 */ 257 #define ZFS_OBJ_HASH(obj_num) ((obj_num) & (ZFS_OBJ_MTX_SZ - 1)) 258 #define ZFS_OBJ_MUTEX(zfsvfs, obj_num) \ 259 (&(zfsvfs)->z_hold_mtx[ZFS_OBJ_HASH(obj_num)]) 260 #define ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num) \ 261 mutex_enter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num))) 262 #define ZFS_OBJ_HOLD_TRYENTER(zfsvfs, obj_num) \ 263 mutex_tryenter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num))) 264 #define ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num) \ 265 mutex_exit(ZFS_OBJ_MUTEX((zfsvfs), (obj_num))) 266 267 /* 268 * Macros to encode/decode ZFS stored time values from/to struct timespec 269 */ 270 #define ZFS_TIME_ENCODE(tp, stmp) \ 271 { \ 272 (stmp)[0] = (uint64_t)(tp)->tv_sec; \ 273 (stmp)[1] = (uint64_t)(tp)->tv_nsec; \ 274 } 275 276 #define ZFS_TIME_DECODE(tp, stmp) \ 277 { \ 278 (tp)->tv_sec = (time_t)(stmp)[0]; \ 279 (tp)->tv_nsec = (long)(stmp)[1]; \ 280 } 281 282 /* 283 * Timestamp defines 284 */ 285 #define ACCESSED (AT_ATIME) 286 #define STATE_CHANGED (AT_CTIME) 287 #define CONTENT_MODIFIED (AT_MTIME | AT_CTIME) 288 289 #define ZFS_ACCESSTIME_STAMP(zfsvfs, zp) \ 290 if ((zfsvfs)->z_atime && !((zfsvfs)->z_vfs->vfs_flag & VFS_RDONLY)) \ 291 zfs_time_stamper(zp, ACCESSED, NULL) 292 293 extern int zfs_init_fs(zfsvfs_t *, znode_t **); 294 extern void zfs_set_dataprop(objset_t *); 295 extern void zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *, 296 dmu_tx_t *tx); 297 extern void zfs_time_stamper(znode_t *, uint_t, dmu_tx_t *); 298 extern void zfs_time_stamper_locked(znode_t *, uint_t, dmu_tx_t *); 299 extern void zfs_grow_blocksize(znode_t *, uint64_t, dmu_tx_t *); 300 extern int zfs_freesp(znode_t *, uint64_t, uint64_t, int, boolean_t); 301 extern void zfs_znode_init(void); 302 extern void zfs_znode_fini(void); 303 extern int zfs_zget(zfsvfs_t *, uint64_t, znode_t **); 304 extern int zfs_rezget(znode_t *); 305 extern void zfs_zinactive(znode_t *); 306 extern void zfs_znode_delete(znode_t *, dmu_tx_t *); 307 extern void zfs_znode_free(znode_t *); 308 extern void zfs_remove_op_tables(); 309 extern int zfs_create_op_tables(); 310 extern int zfs_sync(vfs_t *vfsp, short flag, cred_t *cr); 311 extern dev_t zfs_cmpldev(uint64_t); 312 extern int zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value); 313 extern int zfs_set_version(const char *name, uint64_t newvers); 314 extern int zfs_get_stats(objset_t *os, nvlist_t *nv); 315 extern void zfs_znode_dmu_fini(znode_t *); 316 317 extern void zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 318 znode_t *dzp, znode_t *zp, char *name, vsecattr_t *, zfs_fuid_info_t *, 319 vattr_t *vap); 320 extern int zfs_log_create_txtype(zil_create_t, vsecattr_t *vsecp, 321 vattr_t *vap); 322 extern void zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 323 znode_t *dzp, char *name); 324 extern void zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 325 znode_t *dzp, znode_t *zp, char *name); 326 extern void zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 327 znode_t *dzp, znode_t *zp, char *name, char *link); 328 extern void zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 329 znode_t *sdzp, char *sname, znode_t *tdzp, char *dname, znode_t *szp); 330 extern void zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype, 331 znode_t *zp, offset_t off, ssize_t len, int ioflag); 332 extern void zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype, 333 znode_t *zp, uint64_t off, uint64_t len); 334 extern void zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype, 335 znode_t *zp, vattr_t *vap, uint_t mask_applied, zfs_fuid_info_t *fuidp); 336 extern void zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, znode_t *zp, 337 vsecattr_t *vsecp, zfs_fuid_info_t *fuidp); 338 extern void zfs_xvattr_set(znode_t *zp, xvattr_t *xvap); 339 extern void zfs_upgrade(zfsvfs_t *zfsvfs, dmu_tx_t *tx); 340 341 extern caddr_t zfs_map_page(page_t *, enum seg_rw); 342 extern void zfs_unmap_page(page_t *, caddr_t); 343 344 extern zil_get_data_t zfs_get_data; 345 extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE]; 346 extern int zfsfstype; 347 348 #endif /* _KERNEL */ 349 350 extern int zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len); 351 352 #ifdef __cplusplus 353 } 354 #endif 355 356 #endif /* _SYS_FS_ZFS_ZNODE_H */ 357