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 * Copyright (c) 2012 by Delphix. All rights reserved.
24 */
25
26 #ifndef _SYS_FS_ZFS_ZNODE_H
27 #define _SYS_FS_ZFS_ZNODE_H
28
29 #ifdef _KERNEL
30 #include <sys/list.h>
31 #include <sys/dmu.h>
32 #include <sys/sa.h>
33 #include <sys/zfs_vfsops.h>
34 #include <sys/rrwlock.h>
35 #include <sys/zfs_sa.h>
36 #include <sys/zfs_stat.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 #define ZFS_REPARSE 0x0000080000000000
61 #define ZFS_OFFLINE 0x0000100000000000
62 #define ZFS_SPARSE 0x0000200000000000
63
64 #define ZFS_ATTR_SET(zp, attr, value, pflags, tx) \
65 { \
66 if (value) \
67 pflags |= attr; \
68 else \
69 pflags &= ~attr; \
70 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_FLAGS(zp->z_zfsvfs), \
71 &pflags, sizeof (pflags), tx)); \
72 }
73
74 /*
75 * Define special zfs pflags
76 */
77 #define ZFS_XATTR 0x1 /* is an extended attribute */
78 #define ZFS_INHERIT_ACE 0x2 /* ace has inheritable ACEs */
79 #define ZFS_ACL_TRIVIAL 0x4 /* files ACL is trivial */
80 #define ZFS_ACL_OBJ_ACE 0x8 /* ACL has CMPLX Object ACE */
81 #define ZFS_ACL_PROTECTED 0x10 /* ACL protected */
82 #define ZFS_ACL_DEFAULTED 0x20 /* ACL should be defaulted */
83 #define ZFS_ACL_AUTO_INHERIT 0x40 /* ACL should be inherited */
84 #define ZFS_BONUS_SCANSTAMP 0x80 /* Scanstamp in bonus area */
85 #define ZFS_NO_EXECS_DENIED 0x100 /* exec was given to everyone */
86
87 #define SA_ZPL_ATIME(z) z->z_attr_table[ZPL_ATIME]
88 #define SA_ZPL_MTIME(z) z->z_attr_table[ZPL_MTIME]
89 #define SA_ZPL_CTIME(z) z->z_attr_table[ZPL_CTIME]
90 #define SA_ZPL_CRTIME(z) z->z_attr_table[ZPL_CRTIME]
91 #define SA_ZPL_GEN(z) z->z_attr_table[ZPL_GEN]
92 #define SA_ZPL_DACL_ACES(z) z->z_attr_table[ZPL_DACL_ACES]
93 #define SA_ZPL_XATTR(z) z->z_attr_table[ZPL_XATTR]
94 #define SA_ZPL_SYMLINK(z) z->z_attr_table[ZPL_SYMLINK]
95 #define SA_ZPL_RDEV(z) z->z_attr_table[ZPL_RDEV]
96 #define SA_ZPL_SCANSTAMP(z) z->z_attr_table[ZPL_SCANSTAMP]
97 #define SA_ZPL_UID(z) z->z_attr_table[ZPL_UID]
98 #define SA_ZPL_GID(z) z->z_attr_table[ZPL_GID]
99 #define SA_ZPL_PARENT(z) z->z_attr_table[ZPL_PARENT]
100 #define SA_ZPL_LINKS(z) z->z_attr_table[ZPL_LINKS]
101 #define SA_ZPL_MODE(z) z->z_attr_table[ZPL_MODE]
102 #define SA_ZPL_DACL_COUNT(z) z->z_attr_table[ZPL_DACL_COUNT]
103 #define SA_ZPL_FLAGS(z) z->z_attr_table[ZPL_FLAGS]
104 #define SA_ZPL_SIZE(z) z->z_attr_table[ZPL_SIZE]
105 #define SA_ZPL_ZNODE_ACL(z) z->z_attr_table[ZPL_ZNODE_ACL]
106 #define SA_ZPL_PAD(z) z->z_attr_table[ZPL_PAD]
107
108 /*
109 * Is ID ephemeral?
110 */
111 #define IS_EPHEMERAL(x) (x > MAXUID)
112
113 /*
114 * Should we use FUIDs?
115 */
116 #define USE_FUIDS(version, os) (version >= ZPL_VERSION_FUID && \
117 spa_version(dmu_objset_spa(os)) >= SPA_VERSION_FUID)
118 #define USE_SA(version, os) (version >= ZPL_VERSION_SA && \
119 spa_version(dmu_objset_spa(os)) >= SPA_VERSION_SA)
120
121 #define MASTER_NODE_OBJ 1
122
123 /*
124 * Special attributes for master node.
125 * "userquota@" and "groupquota@" are also valid (from
126 * zfs_userquota_prop_prefixes[]).
127 */
128 #define ZFS_FSID "FSID"
129 #define ZFS_UNLINKED_SET "DELETE_QUEUE"
130 #define ZFS_ROOT_OBJ "ROOT"
131 #define ZPL_VERSION_STR "VERSION"
132 #define ZFS_FUID_TABLES "FUID"
133 #define ZFS_SHARES_DIR "SHARES"
134 #define ZFS_SA_ATTRS "SA_ATTRS"
135
136 #define ZFS_MAX_BLOCKSIZE (SPA_MAXBLOCKSIZE)
137
138 /*
139 * Path component length
140 *
141 * The generic fs code uses MAXNAMELEN to represent
142 * what the largest component length is. Unfortunately,
143 * this length includes the terminating NULL. ZFS needs
144 * to tell the users via pathconf() and statvfs() what the
145 * true maximum length of a component is, excluding the NULL.
146 */
147 #define ZFS_MAXNAMELEN (MAXNAMELEN - 1)
148
149 /*
150 * Convert mode bits (zp_mode) to BSD-style DT_* values for storing in
151 * the directory entries.
152 */
153 #ifndef IFTODT
154 #define IFTODT(mode) (((mode) & S_IFMT) >> 12)
155 #endif
156
157 /*
158 * The directory entry has the type (currently unused on Solaris) in the
159 * top 4 bits, and the object number in the low 48 bits. The "middle"
160 * 12 bits are unused.
161 */
162 #define ZFS_DIRENT_TYPE(de) BF64_GET(de, 60, 4)
163 #define ZFS_DIRENT_OBJ(de) BF64_GET(de, 0, 48)
164
165 /*
166 * Directory entry locks control access to directory entries.
167 * They are used to protect creates, deletes, and renames.
168 * Each directory znode has a mutex and a list of locked names.
169 */
170 #ifdef _KERNEL
171 typedef struct zfs_dirlock {
172 char *dl_name; /* directory entry being locked */
173 uint32_t dl_sharecnt; /* 0 if exclusive, > 0 if shared */
174 uint8_t dl_namelock; /* 1 if z_name_lock is NOT held */
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 uint8_t z_moved; /* Has this znode been moved? */
195 uint_t z_blksz; /* block size in bytes */
196 uint_t z_seq; /* modification sequence number */
197 uint64_t z_mapcnt; /* number of pages mapped to file */
198 uint64_t z_gen; /* generation (cached) */
199 uint64_t z_size; /* file size (cached) */
200 uint64_t z_atime[2]; /* atime (cached) */
201 uint64_t z_links; /* file links (cached) */
202 uint64_t z_pflags; /* pflags (cached) */
203 uint64_t z_uid; /* uid fuid (cached) */
204 uint64_t z_gid; /* gid fuid (cached) */
205 mode_t z_mode; /* mode (cached) */
206 uint32_t z_sync_cnt; /* synchronous open count */
207 kmutex_t z_acl_lock; /* acl data lock */
208 zfs_acl_t *z_acl_cached; /* cached acl */
209 list_node_t z_link_node; /* all znodes in fs link */
210 sa_handle_t *z_sa_hdl; /* handle to sa data */
211 boolean_t z_is_sa; /* are we native sa? */
212 } znode_t;
213
214
215 /*
216 * Range locking rules
217 * --------------------
218 * 1. When truncating a file (zfs_create, zfs_setattr, zfs_space) the whole
219 * file range needs to be locked as RL_WRITER. Only then can the pages be
220 * freed etc and zp_size reset. zp_size must be set within range lock.
221 * 2. For writes and punching holes (zfs_write & zfs_space) just the range
222 * being written or freed needs to be locked as RL_WRITER.
223 * Multiple writes at the end of the file must coordinate zp_size updates
224 * to ensure data isn't lost. A compare and swap loop is currently used
225 * to ensure the file size is at least the offset last written.
226 * 3. For reads (zfs_read, zfs_get_data & zfs_putapage) just the range being
227 * read needs to be locked as RL_READER. A check against zp_size can then
228 * be made for reading beyond end of file.
229 */
230
231 /*
232 * Convert between znode pointers and vnode pointers
233 */
234 #ifdef DEBUG
235 static __inline vnode_t *
ZTOV(znode_t * zp)236 ZTOV(znode_t *zp)
237 {
238 vnode_t *vp = zp->z_vnode;
239
240 ASSERT(vp == NULL || vp->v_data == NULL || vp->v_data == zp);
241 return (vp);
242 }
243 static __inline znode_t *
VTOZ(vnode_t * vp)244 VTOZ(vnode_t *vp)
245 {
246 znode_t *zp = (znode_t *)vp->v_data;
247
248 ASSERT(zp == NULL || zp->z_vnode == NULL || zp->z_vnode == vp);
249 return (zp);
250 }
251 #else
252 #define ZTOV(ZP) ((ZP)->z_vnode)
253 #define VTOZ(VP) ((znode_t *)(VP)->v_data)
254 #endif
255
256 /* Called on entry to each ZFS vnode and vfs operation */
257 #define ZFS_ENTER(zfsvfs) \
258 { \
259 rrw_enter_read(&(zfsvfs)->z_teardown_lock, FTAG); \
260 if ((zfsvfs)->z_unmounted) { \
261 ZFS_EXIT(zfsvfs); \
262 return (EIO); \
263 } \
264 }
265
266 /* Must be called before exiting the vop */
267 #define ZFS_EXIT(zfsvfs) rrw_exit(&(zfsvfs)->z_teardown_lock, FTAG)
268
269 /* Verifies the znode is valid */
270 #define ZFS_VERIFY_ZP(zp) \
271 if ((zp)->z_sa_hdl == NULL) { \
272 ZFS_EXIT((zp)->z_zfsvfs); \
273 return (EIO); \
274 } \
275
276 /*
277 * Macros for dealing with dmu_buf_hold
278 */
279 #define ZFS_OBJ_HASH(obj_num) ((obj_num) & (ZFS_OBJ_MTX_SZ - 1))
280 #define ZFS_OBJ_MUTEX(zfsvfs, obj_num) \
281 (&(zfsvfs)->z_hold_mtx[ZFS_OBJ_HASH(obj_num)])
282 #define ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num) \
283 mutex_enter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num)))
284 #define ZFS_OBJ_HOLD_TRYENTER(zfsvfs, obj_num) \
285 mutex_tryenter(ZFS_OBJ_MUTEX((zfsvfs), (obj_num)))
286 #define ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num) \
287 mutex_exit(ZFS_OBJ_MUTEX((zfsvfs), (obj_num)))
288
289 /* Encode ZFS stored time values from a struct timespec */
290 #define ZFS_TIME_ENCODE(tp, stmp) \
291 { \
292 (stmp)[0] = (uint64_t)(tp)->tv_sec; \
293 (stmp)[1] = (uint64_t)(tp)->tv_nsec; \
294 }
295
296 /* Decode ZFS stored time values to a struct timespec */
297 #define ZFS_TIME_DECODE(tp, stmp) \
298 { \
299 (tp)->tv_sec = (time_t)(stmp)[0]; \
300 (tp)->tv_nsec = (long)(stmp)[1]; \
301 }
302
303 /*
304 * Timestamp defines
305 */
306 #define ACCESSED (AT_ATIME)
307 #define STATE_CHANGED (AT_CTIME)
308 #define CONTENT_MODIFIED (AT_MTIME | AT_CTIME)
309
310 #define ZFS_ACCESSTIME_STAMP(zfsvfs, zp) \
311 if ((zfsvfs)->z_atime && !((zfsvfs)->z_vfs->vfs_flag & VFS_RDONLY)) \
312 zfs_tstamp_update_setup(zp, ACCESSED, NULL, NULL, B_FALSE);
313
314 extern int zfs_init_fs(zfsvfs_t *, znode_t **);
315 extern void zfs_set_dataprop(objset_t *);
316 extern void zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *,
317 dmu_tx_t *tx);
318 extern void zfs_tstamp_update_setup(znode_t *, uint_t, uint64_t [2],
319 uint64_t [2], boolean_t);
320 extern void zfs_grow_blocksize(znode_t *, uint64_t, dmu_tx_t *);
321 extern int zfs_freesp(znode_t *, uint64_t, uint64_t, int, boolean_t);
322 extern void zfs_znode_init(void);
323 extern void zfs_znode_fini(void);
324 extern int zfs_zget(zfsvfs_t *, uint64_t, znode_t **);
325 extern int zfs_rezget(znode_t *);
326 extern void zfs_zinactive(znode_t *);
327 extern void zfs_znode_delete(znode_t *, dmu_tx_t *);
328 extern void zfs_znode_free(znode_t *);
329 extern void zfs_remove_op_tables();
330 extern int zfs_create_op_tables();
331 extern dev_t zfs_cmpldev(uint64_t);
332 extern int zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value);
333 extern int zfs_get_stats(objset_t *os, nvlist_t *nv);
334 extern void zfs_znode_dmu_fini(znode_t *);
335
336 extern void zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
337 znode_t *dzp, znode_t *zp, char *name, vsecattr_t *, zfs_fuid_info_t *,
338 vattr_t *vap);
339 extern int zfs_log_create_txtype(zil_create_t, vsecattr_t *vsecp,
340 vattr_t *vap);
341 extern void zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
342 znode_t *dzp, char *name, uint64_t foid);
343 #define ZFS_NO_OBJECT 0 /* no object id */
344 extern void zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
345 znode_t *dzp, znode_t *zp, char *name);
346 extern void zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
347 znode_t *dzp, znode_t *zp, char *name, char *link);
348 extern void zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
349 znode_t *sdzp, char *sname, znode_t *tdzp, char *dname, znode_t *szp);
350 extern void zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype,
351 znode_t *zp, offset_t off, ssize_t len, int ioflag);
352 extern void zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype,
353 znode_t *zp, uint64_t off, uint64_t len);
354 extern void zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype,
355 znode_t *zp, vattr_t *vap, uint_t mask_applied, zfs_fuid_info_t *fuidp);
356 #ifndef ZFS_NO_ACL
357 extern void zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, znode_t *zp,
358 vsecattr_t *vsecp, zfs_fuid_info_t *fuidp);
359 #endif
360 extern void zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx);
361 extern void zfs_upgrade(zfsvfs_t *zfsvfs, dmu_tx_t *tx);
362 extern int zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx);
363
364 extern zil_get_data_t zfs_get_data;
365 extern zil_replay_func_t *zfs_replay_vector[TX_MAX_TYPE];
366 extern int zfsfstype;
367
368 #endif /* _KERNEL */
369
370 extern int zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len);
371
372 #ifdef __cplusplus
373 }
374 #endif
375
376 #endif /* _SYS_FS_ZFS_ZNODE_H */
377