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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 #ifndef _SYS_FS_ZFS_ZNODE_H 26 #define _SYS_FS_ZFS_ZNODE_H 27 28 #ifdef _KERNEL 29 #include <sys/isa_defs.h> 30 #include <sys/types32.h> 31 #include <sys/attr.h> 32 #include <sys/list.h> 33 #include <sys/dmu.h> 34 #include <sys/sa.h> 35 #include <sys/zfs_vfsops.h> 36 #include <sys/rrwlock.h> 37 #include <sys/zfs_sa.h> 38 #include <sys/zfs_stat.h> 39 #endif 40 #include <sys/zfs_acl.h> 41 #include <sys/zil.h> 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 /* 48 * Additional file level attributes, that are stored 49 * in the upper half of zp_flags 50 */ 51 #define ZFS_READONLY 0x0000000100000000 52 #define ZFS_HIDDEN 0x0000000200000000 53 #define ZFS_SYSTEM 0x0000000400000000 54 #define ZFS_ARCHIVE 0x0000000800000000 55 #define ZFS_IMMUTABLE 0x0000001000000000 56 #define ZFS_NOUNLINK 0x0000002000000000 57 #define ZFS_APPENDONLY 0x0000004000000000 58 #define ZFS_NODUMP 0x0000008000000000 59 #define ZFS_OPAQUE 0x0000010000000000 60 #define ZFS_AV_QUARANTINED 0x0000020000000000 61 #define ZFS_AV_MODIFIED 0x0000040000000000 62 #define ZFS_REPARSE 0x0000080000000000 63 #define ZFS_OFFLINE 0x0000100000000000 64 #define ZFS_SPARSE 0x0000200000000000 65 66 #define ZFS_ATTR_SET(zp, attr, value, pflags, tx) \ 67 { \ 68 if (value) \ 69 pflags |= attr; \ 70 else \ 71 pflags &= ~attr; \ 72 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_FLAGS(zp->z_zfsvfs), \ 73 &pflags, sizeof (pflags), tx)); \ 74 } 75 76 /* 77 * Define special zfs pflags 78 */ 79 #define ZFS_XATTR 0x1 /* is an extended attribute */ 80 #define ZFS_INHERIT_ACE 0x2 /* ace has inheritable ACEs */ 81 #define ZFS_ACL_TRIVIAL 0x4 /* files ACL is trivial */ 82 #define ZFS_ACL_OBJ_ACE 0x8 /* ACL has CMPLX Object ACE */ 83 #define ZFS_ACL_PROTECTED 0x10 /* ACL protected */ 84 #define ZFS_ACL_DEFAULTED 0x20 /* ACL should be defaulted */ 85 #define ZFS_ACL_AUTO_INHERIT 0x40 /* ACL should be inherited */ 86 #define ZFS_BONUS_SCANSTAMP 0x80 /* Scanstamp in bonus area */ 87 #define ZFS_NO_EXECS_DENIED 0x100 /* exec was given to everyone */ 88 89 #define SA_ZPL_ATIME(z) z->z_attr_table[ZPL_ATIME] 90 #define SA_ZPL_MTIME(z) z->z_attr_table[ZPL_MTIME] 91 #define SA_ZPL_CTIME(z) z->z_attr_table[ZPL_CTIME] 92 #define SA_ZPL_CRTIME(z) z->z_attr_table[ZPL_CRTIME] 93 #define SA_ZPL_GEN(z) z->z_attr_table[ZPL_GEN] 94 #define SA_ZPL_DACL_ACES(z) z->z_attr_table[ZPL_DACL_ACES] 95 #define SA_ZPL_XATTR(z) z->z_attr_table[ZPL_XATTR] 96 #define SA_ZPL_SYMLINK(z) z->z_attr_table[ZPL_SYMLINK] 97 #define SA_ZPL_RDEV(z) z->z_attr_table[ZPL_RDEV] 98 #define SA_ZPL_SCANSTAMP(z) z->z_attr_table[ZPL_SCANSTAMP] 99 #define SA_ZPL_UID(z) z->z_attr_table[ZPL_UID] 100 #define SA_ZPL_GID(z) z->z_attr_table[ZPL_GID] 101 #define SA_ZPL_PARENT(z) z->z_attr_table[ZPL_PARENT] 102 #define SA_ZPL_LINKS(z) z->z_attr_table[ZPL_LINKS] 103 #define SA_ZPL_MODE(z) z->z_attr_table[ZPL_MODE] 104 #define SA_ZPL_DACL_COUNT(z) z->z_attr_table[ZPL_DACL_COUNT] 105 #define SA_ZPL_FLAGS(z) z->z_attr_table[ZPL_FLAGS] 106 #define SA_ZPL_SIZE(z) z->z_attr_table[ZPL_SIZE] 107 #define SA_ZPL_ZNODE_ACL(z) z->z_attr_table[ZPL_ZNODE_ACL] 108 #define SA_ZPL_PAD(z) z->z_attr_table[ZPL_PAD] 109 110 /* 111 * Is ID ephemeral? 112 */ 113 #define IS_EPHEMERAL(x) (x > MAXUID) 114 115 /* 116 * Should we use FUIDs? 117 */ 118 #define USE_FUIDS(version, os) (version >= ZPL_VERSION_FUID && \ 119 spa_version(dmu_objset_spa(os)) >= SPA_VERSION_FUID) 120 #define USE_SA(version, os) (version >= ZPL_VERSION_SA && \ 121 spa_version(dmu_objset_spa(os)) >= SPA_VERSION_SA) 122 123 #define MASTER_NODE_OBJ 1 124 125 /* 126 * Special attributes for master node. 127 * "userquota@" and "groupquota@" are also valid (from 128 * zfs_userquota_prop_prefixes[]). 129 */ 130 #define ZFS_FSID "FSID" 131 #define ZFS_UNLINKED_SET "DELETE_QUEUE" 132 #define ZFS_ROOT_OBJ "ROOT" 133 #define ZPL_VERSION_STR "VERSION" 134 #define ZFS_FUID_TABLES "FUID" 135 #define ZFS_SHARES_DIR "SHARES" 136 #define ZFS_SA_ATTRS "SA_ATTRS" 137 138 #define ZFS_MAX_BLOCKSIZE (SPA_MAXBLOCKSIZE) 139 140 /* Path component length */ 141 /* 142 * The generic fs code uses MAXNAMELEN to represent 143 * what the largest component length is. Unfortunately, 144 * this length includes the terminating NULL. ZFS needs 145 * to tell the users via pathconf() and statvfs() what the 146 * true maximum length of a component is, excluding the NULL. 147 */ 148 #define ZFS_MAXNAMELEN (MAXNAMELEN - 1) 149 150 /* 151 * Convert mode bits (zp_mode) to BSD-style DT_* values for storing in 152 * the directory entries. 153 */ 154 #define IFTODT(mode) (((mode) & S_IFMT) >> 12) 155 156 /* 157 * The directory entry has the type (currently unused on Solaris) in the 158 * top 4 bits, and the object number in the low 48 bits. The "middle" 159 * 12 bits are unused. 160 */ 161 #define ZFS_DIRENT_TYPE(de) BF64_GET(de, 60, 4) 162 #define ZFS_DIRENT_OBJ(de) BF64_GET(de, 0, 48) 163 164 /* 165 * Directory entry locks control access to directory entries. 166 * They are used to protect creates, deletes, and renames. 167 * Each directory znode has a mutex and a list of locked names. 168 */ 169 #ifdef _KERNEL 170 typedef struct zfs_dirlock { 171 char *dl_name; /* directory entry being locked */ 172 uint32_t dl_sharecnt; /* 0 if exclusive, > 0 if shared */ 173 uint8_t dl_namelock; /* 1 if z_name_lock is NOT held */ 174 uint16_t dl_namesize; /* set if dl_name was allocated */ 175 kcondvar_t dl_cv; /* wait for entry to be unlocked */ 176 struct znode *dl_dzp; /* directory znode */ 177 struct zfs_dirlock *dl_next; /* next in z_dirlocks list */ 178 } zfs_dirlock_t; 179 180 typedef struct znode { 181 struct zfsvfs *z_zfsvfs; 182 vnode_t *z_vnode; 183 uint64_t z_id; /* object ID for this znode */ 184 kmutex_t z_lock; /* znode modification lock */ 185 krwlock_t z_parent_lock; /* parent lock for directories */ 186 krwlock_t z_name_lock; /* "master" lock for dirent locks */ 187 zfs_dirlock_t *z_dirlocks; /* directory entry lock list */ 188 kmutex_t z_range_lock; /* protects changes to z_range_avl */ 189 avl_tree_t z_range_avl; /* avl tree of file range locks */ 190 uint8_t z_unlinked; /* file has been unlinked */ 191 uint8_t z_atime_dirty; /* atime needs to be synced */ 192 uint8_t z_zn_prefetch; /* Prefetch znodes? */ 193 uint8_t z_moved; /* Has this znode been moved? */ 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_gen; /* generation (cached) */ 198 uint64_t z_size; /* file size (cached) */ 199 uint64_t z_atime[2]; /* atime (cached) */ 200 uint64_t z_links; /* file links (cached) */ 201 uint64_t z_pflags; /* pflags (cached) */ 202 uint64_t z_uid; /* uid fuid (cached) */ 203 uint64_t z_gid; /* gid fuid (cached) */ 204 mode_t z_mode; /* mode (cached) */ 205 uint32_t z_sync_cnt; /* synchronous open count */ 206 kmutex_t z_acl_lock; /* acl data lock */ 207 zfs_acl_t *z_acl_cached; /* cached acl */ 208 list_node_t z_link_node; /* all znodes in fs link */ 209 sa_handle_t *z_sa_hdl; /* handle to sa data */ 210 boolean_t z_is_sa; /* are we native sa? */ 211 } znode_t; 212 213 214 /* 215 * Range locking rules 216 * -------------------- 217 * 1. When truncating a file (zfs_create, zfs_setattr, zfs_space) the whole 218 * file range needs to be locked as RL_WRITER. Only then can the pages be 219 * freed etc and zp_size reset. zp_size must be set within range lock. 220 * 2. For writes and punching holes (zfs_write & zfs_space) just the range 221 * being written or freed needs to be locked as RL_WRITER. 222 * Multiple writes at the end of the file must coordinate zp_size updates 223 * to ensure data isn't lost. A compare and swap loop is currently used 224 * to ensure the file size is at least the offset last written. 225 * 3. For reads (zfs_read, zfs_get_data & zfs_putapage) just the range being 226 * read needs to be locked as RL_READER. A check against zp_size can then 227 * be made for reading beyond end of file. 228 */ 229 230 /* 231 * Convert between znode pointers and vnode pointers 232 */ 233 #define ZTOV(ZP) ((ZP)->z_vnode) 234 #define VTOZ(VP) ((znode_t *)(VP)->v_data) 235 236 /* 237 * ZFS_ENTER() is called on entry to each ZFS vnode and vfs operation. 238 * ZFS_EXIT() must be called before exitting the vop. 239 * ZFS_VERIFY_ZP() verifies the znode is valid. 240 */ 241 #define ZFS_ENTER(zfsvfs) \ 242 { \ 243 rrw_enter(&(zfsvfs)->z_teardown_lock, RW_READER, FTAG); \ 244 if ((zfsvfs)->z_unmounted) { \ 245 ZFS_EXIT(zfsvfs); \ 246 return (EIO); \ 247 } \ 248 } 249 250 #define ZFS_EXIT(zfsvfs) rrw_exit(&(zfsvfs)->z_teardown_lock, FTAG) 251 252 #define ZFS_VERIFY_ZP(zp) \ 253 if ((zp)->z_sa_hdl == NULL) { \ 254 ZFS_EXIT((zp)->z_zfsvfs); \ 255 return (EIO); \ 256 } \ 257 258 /* 259 * Macros for dealing with dmu_buf_hold 260 */ 261 #define ZFS_OBJ_HASH(obj_num) ((obj_num) & (ZFS_OBJ_MTX_SZ - 1)) 262 #define ZFS_OBJ_MUTEX(zfsvfs, obj_num) \ 263 (&(zfsvfs)->z_hold_mtx[ZFS_OBJ_HASH(obj_num)]) 264 #define ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num) \ 265 mutex_enter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num))) 266 #define ZFS_OBJ_HOLD_TRYENTER(zfsvfs, obj_num) \ 267 mutex_tryenter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num))) 268 #define ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num) \ 269 mutex_exit(ZFS_OBJ_MUTEX((zfsvfs), (obj_num))) 270 271 /* 272 * Macros to encode/decode ZFS stored time values from/to struct timespec 273 */ 274 #define ZFS_TIME_ENCODE(tp, stmp) \ 275 { \ 276 (stmp)[0] = (uint64_t)(tp)->tv_sec; \ 277 (stmp)[1] = (uint64_t)(tp)->tv_nsec; \ 278 } 279 280 #define ZFS_TIME_DECODE(tp, stmp) \ 281 { \ 282 (tp)->tv_sec = (time_t)(stmp)[0]; \ 283 (tp)->tv_nsec = (long)(stmp)[1]; \ 284 } 285 286 /* 287 * Timestamp defines 288 */ 289 #define ACCESSED (AT_ATIME) 290 #define STATE_CHANGED (AT_CTIME) 291 #define CONTENT_MODIFIED (AT_MTIME | AT_CTIME) 292 293 #define ZFS_ACCESSTIME_STAMP(zfsvfs, zp) \ 294 if ((zfsvfs)->z_atime && !((zfsvfs)->z_vfs->vfs_flag & VFS_RDONLY)) \ 295 zfs_tstamp_update_setup(zp, ACCESSED, NULL, NULL, B_FALSE); 296 297 extern int zfs_init_fs(zfsvfs_t *, znode_t **); 298 extern void zfs_set_dataprop(objset_t *); 299 extern void zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *, 300 dmu_tx_t *tx); 301 extern void zfs_tstamp_update_setup(znode_t *, uint_t, uint64_t [2], 302 uint64_t [2], boolean_t); 303 extern void zfs_grow_blocksize(znode_t *, uint64_t, dmu_tx_t *); 304 extern int zfs_freesp(znode_t *, uint64_t, uint64_t, int, boolean_t); 305 extern void zfs_znode_init(void); 306 extern void zfs_znode_fini(void); 307 extern int zfs_zget(zfsvfs_t *, uint64_t, znode_t **); 308 extern int zfs_rezget(znode_t *); 309 extern void zfs_zinactive(znode_t *); 310 extern void zfs_znode_delete(znode_t *, dmu_tx_t *); 311 extern void zfs_znode_free(znode_t *); 312 extern void zfs_remove_op_tables(); 313 extern int zfs_create_op_tables(); 314 extern int zfs_sync(vfs_t *vfsp, short flag, cred_t *cr); 315 extern dev_t zfs_cmpldev(uint64_t); 316 extern int zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value); 317 extern int zfs_get_stats(objset_t *os, nvlist_t *nv); 318 extern void zfs_znode_dmu_fini(znode_t *); 319 320 extern void zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 321 znode_t *dzp, znode_t *zp, char *name, vsecattr_t *, zfs_fuid_info_t *, 322 vattr_t *vap); 323 extern int zfs_log_create_txtype(zil_create_t, vsecattr_t *vsecp, 324 vattr_t *vap); 325 extern void zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 326 znode_t *dzp, char *name, uint64_t foid); 327 #define ZFS_NO_OBJECT 0 /* no object id */ 328 extern void zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 329 znode_t *dzp, znode_t *zp, char *name); 330 extern void zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 331 znode_t *dzp, znode_t *zp, char *name, char *link); 332 extern void zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, 333 znode_t *sdzp, char *sname, znode_t *tdzp, char *dname, znode_t *szp); 334 extern void zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype, 335 znode_t *zp, offset_t off, ssize_t len, int ioflag); 336 extern void zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype, 337 znode_t *zp, uint64_t off, uint64_t len); 338 extern void zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype, 339 znode_t *zp, vattr_t *vap, uint_t mask_applied, zfs_fuid_info_t *fuidp); 340 extern void zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, znode_t *zp, 341 vsecattr_t *vsecp, zfs_fuid_info_t *fuidp); 342 extern void zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx); 343 extern void zfs_upgrade(zfsvfs_t *zfsvfs, dmu_tx_t *tx); 344 extern int zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx); 345 346 extern caddr_t zfs_map_page(page_t *, enum seg_rw); 347 extern void zfs_unmap_page(page_t *, caddr_t); 348 349 extern zil_get_data_t zfs_get_data; 350 extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE]; 351 extern int zfsfstype; 352 353 #endif /* _KERNEL */ 354 355 extern int zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len); 356 357 #ifdef __cplusplus 358 } 359 #endif 360 361 #endif /* _SYS_FS_ZFS_ZNODE_H */ 362