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.
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.
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]
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #ifndef _SYS_FS_ZFS_ZNODE_H
27 #define _SYS_FS_ZFS_ZNODE_H
29 #pragma ident "@(#)zfs_znode.h 1.25 07/12/07 SMI"
32 #include <sys/isa_defs.h>
33 #include <sys/types32.h>
37 #include <sys/zfs_vfsops.h>
38 #include <sys/rrwlock.h>
40 #include <sys/zfs_acl.h>
48 * Additional file level attributes, that are stored
49 * in the upper half of zp_flags
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
63 #define ZFS_ATTR_SET(zp, attr, value) \
66 zp->z_phys->zp_flags |= attr; \
68 zp->z_phys->zp_flags &= ~attr; \
72 * Define special zfs pflags
74 #define ZFS_XATTR 0x1 /* is an extended attribute */
75 #define ZFS_INHERIT_ACE 0x2 /* ace has inheritable ACEs */
76 #define ZFS_ACL_TRIVIAL 0x4 /* files ACL is trivial */
77 #define ZFS_ACL_OBJ_ACE 0x8 /* ACL has CMPLX Object ACE */
78 #define ZFS_ACL_PROTECTED 0x10 /* ACL protected */
79 #define ZFS_ACL_DEFAULTED 0x20 /* ACL should be defaulted */
80 #define ZFS_ACL_AUTO_INHERIT 0x40 /* ACL should be inherited */
81 #define ZFS_BONUS_SCANSTAMP 0x80 /* Scanstamp in bonus area */
86 #define IS_EPHEMERAL(x) (x > MAXUID)
89 * Should we use FUIDs?
91 #define USE_FUIDS(version, os) (version >= ZPL_VERSION_FUID &&\
92 spa_version(dmu_objset_spa(os)) >= SPA_VERSION_FUID)
94 #define MASTER_NODE_OBJ 1
97 * Special attributes for master node.
99 #define ZFS_FSID "FSID"
100 #define ZFS_UNLINKED_SET "DELETE_QUEUE"
101 #define ZFS_ROOT_OBJ "ROOT"
102 #define ZPL_VERSION_STR "VERSION"
103 #define ZFS_FUID_TABLES "FUID"
105 #define ZFS_MAX_BLOCKSIZE (SPA_MAXBLOCKSIZE)
107 /* Path component length */
109 * The generic fs code uses MAXNAMELEN to represent
110 * what the largest component length is. Unfortunately,
111 * this length includes the terminating NULL. ZFS needs
112 * to tell the users via pathconf() and statvfs() what the
113 * true maximum length of a component is, excluding the NULL.
115 #define ZFS_MAXNAMELEN (MAXNAMELEN - 1)
118 * Convert mode bits (zp_mode) to BSD-style DT_* values for storing in
119 * the directory entries.
121 #define IFTODT(mode) (((mode) & S_IFMT) >> 12)
124 * The directory entry has the type (currently unused on Solaris) in the
125 * top 4 bits, and the object number in the low 48 bits. The "middle"
126 * 12 bits are unused.
128 #define ZFS_DIRENT_TYPE(de) BF64_GET(de, 60, 4)
129 #define ZFS_DIRENT_OBJ(de) BF64_GET(de, 0, 48)
132 * This is the persistent portion of the znode. It is stored
133 * in the "bonus buffer" of the file. Short symbolic links
134 * are also stored in the bonus buffer.
136 typedef struct znode_phys {
137 uint64_t zp_atime[2]; /* 0 - last file access time */
138 uint64_t zp_mtime[2]; /* 16 - last file modification time */
139 uint64_t zp_ctime[2]; /* 32 - last file change time */
140 uint64_t zp_crtime[2]; /* 48 - creation time */
141 uint64_t zp_gen; /* 64 - generation (txg of creation) */
142 uint64_t zp_mode; /* 72 - file mode bits */
143 uint64_t zp_size; /* 80 - size of file */
144 uint64_t zp_parent; /* 88 - directory parent (`..') */
145 uint64_t zp_links; /* 96 - number of links to file */
146 uint64_t zp_xattr; /* 104 - DMU object for xattrs */
147 uint64_t zp_rdev; /* 112 - dev_t for VBLK & VCHR files */
148 uint64_t zp_flags; /* 120 - persistent flags */
149 uint64_t zp_uid; /* 128 - file owner */
150 uint64_t zp_gid; /* 136 - owning group */
151 uint64_t zp_zap; /* 144 - extra attributes */
152 uint64_t zp_pad[3]; /* 152 - future */
153 zfs_acl_phys_t zp_acl; /* 176 - 263 ACL */
155 * Data may pad out any remaining bytes in the znode buffer, eg:
157 * |<---------------------- dnode_phys (512) ------------------------>|
158 * |<-- dnode (192) --->|<----------- "bonus" buffer (320) ---------->|
159 * |<---- znode (264) ---->|<---- data (56) ---->|
161 * At present, we use this space for the following:
163 * - 32-byte anti-virus scanstamp (regular files only)
168 * Directory entry locks control access to directory entries.
169 * They are used to protect creates, deletes, and renames.
170 * Each directory znode has a mutex and a list of locked names.
173 typedef struct zfs_dirlock {
174 char *dl_name; /* directory entry being locked */
175 uint32_t dl_sharecnt; /* 0 if exclusive, > 0 if shared */
176 uint16_t dl_namesize; /* set if dl_name was allocated */
177 kcondvar_t dl_cv; /* wait for entry to be unlocked */
178 struct znode *dl_dzp; /* directory znode */
179 struct zfs_dirlock *dl_next; /* next in z_dirlocks list */
182 typedef struct znode {
183 struct zfsvfs *z_zfsvfs;
185 uint64_t z_id; /* object ID for this znode */
186 kmutex_t z_lock; /* znode modification lock */
187 krwlock_t z_map_lock; /* page map lock */
188 krwlock_t z_parent_lock; /* parent lock for directories */
189 krwlock_t z_name_lock; /* "master" lock for dirent locks */
190 zfs_dirlock_t *z_dirlocks; /* directory entry lock list */
191 kmutex_t z_range_lock; /* protects changes to z_range_avl */
192 avl_tree_t z_range_avl; /* avl tree of file range locks */
193 uint8_t z_unlinked; /* file has been unlinked */
194 uint8_t z_atime_dirty; /* atime needs to be synced */
195 uint8_t z_zn_prefetch; /* Prefetch znodes? */
196 uint_t z_blksz; /* block size in bytes */
197 uint_t z_seq; /* modification sequence number */
198 uint64_t z_mapcnt; /* number of pages mapped to file */
199 uint64_t z_last_itx; /* last ZIL itx on this znode */
200 uint64_t z_gen; /* generation (same as zp_gen) */
201 uint32_t z_sync_cnt; /* synchronous open count */
202 kmutex_t z_acl_lock; /* acl data lock */
203 list_node_t z_link_node; /* all znodes in fs link */
205 * These are dmu managed fields.
207 znode_phys_t *z_phys; /* pointer to persistent znode */
208 dmu_buf_t *z_dbuf; /* buffer containing the z_phys */
213 * Range locking rules
214 * --------------------
215 * 1. When truncating a file (zfs_create, zfs_setattr, zfs_space) the whole
216 * file range needs to be locked as RL_WRITER. Only then can the pages be
217 * freed etc and zp_size reset. zp_size must be set within range lock.
218 * 2. For writes and punching holes (zfs_write & zfs_space) just the range
219 * being written or freed needs to be locked as RL_WRITER.
220 * Multiple writes at the end of the file must coordinate zp_size updates
221 * to ensure data isn't lost. A compare and swap loop is currently used
222 * to ensure the file size is at least the offset last written.
223 * 3. For reads (zfs_read, zfs_get_data & zfs_putapage) just the range being
224 * read needs to be locked as RL_READER. A check against zp_size can then
225 * be made for reading beyond end of file.
229 * Convert between znode pointers and vnode pointers
231 #define ZTOV(ZP) ((ZP)->z_vnode)
232 #define VTOZ(VP) ((znode_t *)(VP)->v_data)
235 * ZFS_ENTER() is called on entry to each ZFS vnode and vfs operation.
236 * ZFS_EXIT() must be called before exitting the vop.
237 * ZFS_VERIFY_ZP() verifies the znode is valid.
239 #define ZFS_ENTER(zfsvfs) \
241 rrw_enter(&(zfsvfs)->z_teardown_lock, RW_READER, FTAG); \
242 if ((zfsvfs)->z_unmounted) { \
248 #define ZFS_EXIT(zfsvfs) rrw_exit(&(zfsvfs)->z_teardown_lock, FTAG)
250 #define ZFS_VERIFY_ZP(zp) \
251 if ((zp)->z_dbuf == NULL) { \
252 ZFS_EXIT((zp)->z_zfsvfs); \
257 * Macros for dealing with dmu_buf_hold
259 #define ZFS_OBJ_HASH(obj_num) ((obj_num) & (ZFS_OBJ_MTX_SZ - 1))
260 #define ZFS_OBJ_MUTEX(zp) \
261 (&(zp)->z_zfsvfs->z_hold_mtx[ZFS_OBJ_HASH((zp)->z_id)])
262 #define ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num) \
263 mutex_enter(&(zfsvfs)->z_hold_mtx[ZFS_OBJ_HASH(obj_num)]);
264 #define ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num) \
265 mutex_exit(&(zfsvfs)->z_hold_mtx[ZFS_OBJ_HASH(obj_num)])
268 * Macros to encode/decode ZFS stored time values from/to struct timespec
270 #define ZFS_TIME_ENCODE(tp, stmp) \
272 (stmp)[0] = (uint64_t)(tp)->tv_sec; \
273 (stmp)[1] = (uint64_t)(tp)->tv_nsec; \
276 #define ZFS_TIME_DECODE(tp, stmp) \
278 (tp)->tv_sec = (time_t)(stmp)[0]; \
279 (tp)->tv_nsec = (long)(stmp)[1]; \
285 #define ACCESSED (AT_ATIME)
286 #define STATE_CHANGED (AT_CTIME)
287 #define CONTENT_MODIFIED (AT_MTIME | AT_CTIME)
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)
293 extern int zfs_init_fs(zfsvfs_t *, znode_t **, cred_t *);
294 extern void zfs_set_dataprop(objset_t *);
295 extern void zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *,
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 *);
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 *,
320 extern int zfs_log_create_txtype(zil_create_t, vsecattr_t *vsecp,
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);
341 extern zil_get_data_t zfs_get_data;
342 extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE];
343 extern int zfsfstype;
347 extern int zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len);
353 #endif /* _SYS_FS_ZFS_ZNODE_H */