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51f0bbe4 BB |
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) 2011, Lawrence Livermore National Security, LLC. | |
23 | */ | |
24 | ||
25 | ||
26 | #include <sys/zfs_vfsops.h> | |
27 | #include <sys/zfs_vnops.h> | |
28 | #include <sys/zfs_znode.h> | |
ebe7e575 | 29 | #include <sys/zfs_ctldir.h> |
51f0bbe4 BB |
30 | #include <sys/zpl.h> |
31 | ||
32 | ||
33 | static struct inode * | |
34 | zpl_inode_alloc(struct super_block *sb) | |
35 | { | |
36 | struct inode *ip; | |
37 | ||
38 | VERIFY3S(zfs_inode_alloc(sb, &ip), ==, 0); | |
42f7b73b | 39 | inode_set_iversion(ip, 1); |
51f0bbe4 BB |
40 | |
41 | return (ip); | |
42 | } | |
43 | ||
44 | static void | |
45 | zpl_inode_destroy(struct inode *ip) | |
46 | { | |
a08ee875 | 47 | ASSERT(atomic_read(&ip->i_count) == 0); |
51f0bbe4 BB |
48 | zfs_inode_destroy(ip); |
49 | } | |
50 | ||
8780c539 BB |
51 | /* |
52 | * Called from __mark_inode_dirty() to reflect that something in the | |
53 | * inode has changed. We use it to ensure the znode system attributes | |
54 | * are always strictly update to date with respect to the inode. | |
55 | */ | |
56 | #ifdef HAVE_DIRTY_INODE_WITH_FLAGS | |
57 | static void | |
58 | zpl_dirty_inode(struct inode *ip, int flags) | |
59 | { | |
ea04106b AX |
60 | fstrans_cookie_t cookie; |
61 | ||
62 | cookie = spl_fstrans_mark(); | |
8780c539 | 63 | zfs_dirty_inode(ip, flags); |
ea04106b | 64 | spl_fstrans_unmark(cookie); |
8780c539 BB |
65 | } |
66 | #else | |
67 | static void | |
68 | zpl_dirty_inode(struct inode *ip) | |
69 | { | |
ea04106b AX |
70 | fstrans_cookie_t cookie; |
71 | ||
72 | cookie = spl_fstrans_mark(); | |
8780c539 | 73 | zfs_dirty_inode(ip, 0); |
ea04106b | 74 | spl_fstrans_unmark(cookie); |
8780c539 BB |
75 | } |
76 | #endif /* HAVE_DIRTY_INODE_WITH_FLAGS */ | |
77 | ||
2c395def BB |
78 | /* |
79 | * When ->drop_inode() is called its return value indicates if the | |
80 | * inode should be evicted from the inode cache. If the inode is | |
81 | * unhashed and has no links the default policy is to evict it | |
82 | * immediately. | |
83 | * | |
84 | * Prior to 2.6.36 this eviction was accomplished by the vfs calling | |
85 | * ->delete_inode(). It was ->delete_inode()'s responsibility to | |
86 | * truncate the inode pages and call clear_inode(). The call to | |
87 | * clear_inode() synchronously invalidates all the buffers and | |
88 | * calls ->clear_inode(). It was ->clear_inode()'s responsibility | |
89 | * to cleanup and filesystem specific data before freeing the inode. | |
90 | * | |
91 | * This elaborate mechanism was replaced by ->evict_inode() which | |
92 | * does the job of both ->delete_inode() and ->clear_inode(). It | |
93 | * will be called exactly once, and when it returns the inode must | |
739a1a82 RY |
94 | * be in a state where it can simply be freed.i |
95 | * | |
96 | * The ->evict_inode() callback must minimally truncate the inode pages, | |
97 | * and call clear_inode(). For 2.6.35 and later kernels this will | |
98 | * simply update the inode state, with the sync occurring before the | |
99 | * truncate in evict(). For earlier kernels clear_inode() maps to | |
100 | * end_writeback() which is responsible for completing all outstanding | |
101 | * write back. In either case, once this is done it is safe to cleanup | |
102 | * any remaining inode specific data via zfs_inactive(). | |
2c395def BB |
103 | * remaining filesystem specific data. |
104 | */ | |
105 | #ifdef HAVE_EVICT_INODE | |
51f0bbe4 | 106 | static void |
2c395def | 107 | zpl_evict_inode(struct inode *ip) |
51f0bbe4 | 108 | { |
ea04106b AX |
109 | fstrans_cookie_t cookie; |
110 | ||
111 | cookie = spl_fstrans_mark(); | |
b3129792 | 112 | truncate_setsize(ip, 0); |
739a1a82 | 113 | clear_inode(ip); |
2c395def | 114 | zfs_inactive(ip); |
ea04106b | 115 | spl_fstrans_unmark(cookie); |
51f0bbe4 BB |
116 | } |
117 | ||
2c395def BB |
118 | #else |
119 | ||
ea04106b AX |
120 | static void |
121 | zpl_drop_inode(struct inode *ip) | |
122 | { | |
123 | generic_delete_inode(ip); | |
124 | } | |
125 | ||
51f0bbe4 | 126 | static void |
2c395def | 127 | zpl_clear_inode(struct inode *ip) |
51f0bbe4 | 128 | { |
ea04106b AX |
129 | fstrans_cookie_t cookie; |
130 | ||
131 | cookie = spl_fstrans_mark(); | |
51f0bbe4 | 132 | zfs_inactive(ip); |
ea04106b | 133 | spl_fstrans_unmark(cookie); |
51f0bbe4 BB |
134 | } |
135 | ||
2c395def BB |
136 | static void |
137 | zpl_inode_delete(struct inode *ip) | |
138 | { | |
b3129792 | 139 | truncate_setsize(ip, 0); |
2c395def BB |
140 | clear_inode(ip); |
141 | } | |
2c395def BB |
142 | #endif /* HAVE_EVICT_INODE */ |
143 | ||
51f0bbe4 BB |
144 | static void |
145 | zpl_put_super(struct super_block *sb) | |
146 | { | |
ea04106b | 147 | fstrans_cookie_t cookie; |
51f0bbe4 BB |
148 | int error; |
149 | ||
ea04106b | 150 | cookie = spl_fstrans_mark(); |
51f0bbe4 | 151 | error = -zfs_umount(sb); |
ea04106b | 152 | spl_fstrans_unmark(cookie); |
51f0bbe4 BB |
153 | ASSERT3S(error, <=, 0); |
154 | } | |
155 | ||
03f9ba9d BB |
156 | static int |
157 | zpl_sync_fs(struct super_block *sb, int wait) | |
158 | { | |
ea04106b | 159 | fstrans_cookie_t cookie; |
0d3ac5e7 | 160 | cred_t *cr = CRED(); |
03f9ba9d BB |
161 | int error; |
162 | ||
0d3ac5e7 | 163 | crhold(cr); |
ea04106b | 164 | cookie = spl_fstrans_mark(); |
03f9ba9d | 165 | error = -zfs_sync(sb, wait, cr); |
ea04106b | 166 | spl_fstrans_unmark(cookie); |
0d3ac5e7 | 167 | crfree(cr); |
03f9ba9d BB |
168 | ASSERT3S(error, <=, 0); |
169 | ||
170 | return (error); | |
171 | } | |
172 | ||
51f0bbe4 BB |
173 | static int |
174 | zpl_statfs(struct dentry *dentry, struct kstatfs *statp) | |
175 | { | |
ea04106b | 176 | fstrans_cookie_t cookie; |
51f0bbe4 BB |
177 | int error; |
178 | ||
ea04106b | 179 | cookie = spl_fstrans_mark(); |
51f0bbe4 | 180 | error = -zfs_statvfs(dentry, statp); |
ea04106b | 181 | spl_fstrans_unmark(cookie); |
51f0bbe4 BB |
182 | ASSERT3S(error, <=, 0); |
183 | ||
184 | return (error); | |
185 | } | |
186 | ||
0de19dad BB |
187 | static int |
188 | zpl_remount_fs(struct super_block *sb, int *flags, char *data) | |
189 | { | |
cae5b340 | 190 | zfs_mnt_t zm = { .mnt_osname = NULL, .mnt_data = data }; |
ea04106b | 191 | fstrans_cookie_t cookie; |
0de19dad | 192 | int error; |
ea04106b AX |
193 | |
194 | cookie = spl_fstrans_mark(); | |
cae5b340 | 195 | error = -zfs_remount(sb, flags, &zm); |
ea04106b | 196 | spl_fstrans_unmark(cookie); |
0de19dad BB |
197 | ASSERT3S(error, <=, 0); |
198 | ||
199 | return (error); | |
200 | } | |
201 | ||
51f0bbe4 | 202 | static int |
cae5b340 | 203 | __zpl_show_options(struct seq_file *seq, zfsvfs_t *zfsvfs) |
51f0bbe4 | 204 | { |
cae5b340 AX |
205 | seq_printf(seq, ",%s", |
206 | zfsvfs->z_flags & ZSB_XATTR ? "xattr" : "noxattr"); | |
47621f3d | 207 | |
a08ee875 | 208 | #ifdef CONFIG_FS_POSIX_ACL |
cae5b340 | 209 | switch (zfsvfs->z_acl_type) { |
a08ee875 LG |
210 | case ZFS_ACLTYPE_POSIXACL: |
211 | seq_puts(seq, ",posixacl"); | |
212 | break; | |
213 | default: | |
214 | seq_puts(seq, ",noacl"); | |
215 | break; | |
216 | } | |
217 | #endif /* CONFIG_FS_POSIX_ACL */ | |
218 | ||
47621f3d BB |
219 | return (0); |
220 | } | |
a08ee875 LG |
221 | |
222 | #ifdef HAVE_SHOW_OPTIONS_WITH_DENTRY | |
223 | static int | |
224 | zpl_show_options(struct seq_file *seq, struct dentry *root) | |
225 | { | |
226 | return (__zpl_show_options(seq, root->d_sb->s_fs_info)); | |
227 | } | |
47621f3d BB |
228 | #else |
229 | static int | |
230 | zpl_show_options(struct seq_file *seq, struct vfsmount *vfsp) | |
231 | { | |
a08ee875 | 232 | return (__zpl_show_options(seq, vfsp->mnt_sb->s_fs_info)); |
51f0bbe4 | 233 | } |
47621f3d | 234 | #endif /* HAVE_SHOW_OPTIONS_WITH_DENTRY */ |
51f0bbe4 BB |
235 | |
236 | static int | |
237 | zpl_fill_super(struct super_block *sb, void *data, int silent) | |
238 | { | |
cae5b340 | 239 | zfs_mnt_t *zm = (zfs_mnt_t *)data; |
ea04106b | 240 | fstrans_cookie_t cookie; |
51f0bbe4 BB |
241 | int error; |
242 | ||
ea04106b | 243 | cookie = spl_fstrans_mark(); |
cae5b340 | 244 | error = -zfs_domount(sb, zm, silent); |
ea04106b | 245 | spl_fstrans_unmark(cookie); |
51f0bbe4 BB |
246 | ASSERT3S(error, <=, 0); |
247 | ||
248 | return (error); | |
249 | } | |
250 | ||
42f7b73b AX |
251 | static int |
252 | zpl_test_super(struct super_block *s, void *data) | |
253 | { | |
254 | zfsvfs_t *zfsvfs = s->s_fs_info; | |
255 | objset_t *os = data; | |
256 | ||
257 | if (zfsvfs == NULL) | |
258 | return (0); | |
259 | ||
260 | return (os == zfsvfs->z_os); | |
261 | } | |
262 | ||
263 | static struct super_block * | |
264 | zpl_mount_impl(struct file_system_type *fs_type, int flags, zfs_mnt_t *zm) | |
265 | { | |
266 | struct super_block *s; | |
267 | objset_t *os; | |
268 | int err; | |
269 | ||
270 | err = dmu_objset_hold(zm->mnt_osname, FTAG, &os); | |
271 | if (err) | |
272 | return (ERR_PTR(-err)); | |
273 | ||
274 | s = zpl_sget(fs_type, zpl_test_super, set_anon_super, flags, os); | |
275 | dmu_objset_rele(os, FTAG); | |
276 | if (IS_ERR(s)) | |
277 | return (ERR_CAST(s)); | |
278 | ||
279 | if (s->s_root == NULL) { | |
280 | err = zpl_fill_super(s, zm, flags & SB_SILENT ? 1 : 0); | |
281 | if (err) { | |
282 | deactivate_locked_super(s); | |
283 | return (ERR_PTR(err)); | |
284 | } | |
285 | s->s_flags |= SB_ACTIVE; | |
286 | } else if ((flags ^ s->s_flags) & SB_RDONLY) { | |
287 | deactivate_locked_super(s); | |
288 | return (ERR_PTR(-EBUSY)); | |
289 | } | |
290 | ||
291 | return (s); | |
292 | } | |
293 | ||
294 | #ifdef HAVE_FST_MOUNT | |
2cf7f52b BB |
295 | static struct dentry * |
296 | zpl_mount(struct file_system_type *fs_type, int flags, | |
297 | const char *osname, void *data) | |
298 | { | |
cae5b340 | 299 | zfs_mnt_t zm = { .mnt_osname = osname, .mnt_data = data }; |
2cf7f52b | 300 | |
42f7b73b AX |
301 | struct super_block *sb = zpl_mount_impl(fs_type, flags, &zm); |
302 | if (IS_ERR(sb)) | |
303 | return (ERR_CAST(sb)); | |
304 | ||
305 | return (dget(sb->s_root)); | |
2cf7f52b BB |
306 | } |
307 | #else | |
51f0bbe4 BB |
308 | static int |
309 | zpl_get_sb(struct file_system_type *fs_type, int flags, | |
310 | const char *osname, void *data, struct vfsmount *mnt) | |
311 | { | |
cae5b340 | 312 | zfs_mnt_t zm = { .mnt_osname = osname, .mnt_data = data }; |
51f0bbe4 | 313 | |
42f7b73b AX |
314 | struct super_block *sb = zpl_mount_impl(fs_type, flags, &zm); |
315 | if (IS_ERR(sb)) | |
316 | return (PTR_ERR(sb)); | |
317 | ||
318 | (void) simple_set_mnt(mnt, sb); | |
319 | ||
320 | return (0); | |
51f0bbe4 | 321 | } |
42f7b73b | 322 | #endif /* HAVE_FST_MOUNT */ |
51f0bbe4 BB |
323 | |
324 | static void | |
325 | zpl_kill_sb(struct super_block *sb) | |
326 | { | |
ebe7e575 | 327 | zfs_preumount(sb); |
51f0bbe4 | 328 | kill_anon_super(sb); |
c06d4368 AX |
329 | |
330 | #ifdef HAVE_S_INSTANCES_LIST_HEAD | |
331 | sb->s_instances.next = &(zpl_fs_type.fs_supers); | |
332 | #endif /* HAVE_S_INSTANCES_LIST_HEAD */ | |
51f0bbe4 BB |
333 | } |
334 | ||
ab26409d | 335 | void |
ea04106b | 336 | zpl_prune_sb(int64_t nr_to_scan, void *arg) |
ab26409d | 337 | { |
ea04106b AX |
338 | struct super_block *sb = (struct super_block *)arg; |
339 | int objects = 0; | |
ab26409d | 340 | |
cae5b340 | 341 | (void) -zfs_prune(sb, nr_to_scan, &objects); |
ab26409d | 342 | } |
ab26409d BB |
343 | |
344 | #ifdef HAVE_NR_CACHED_OBJECTS | |
345 | static int | |
346 | zpl_nr_cached_objects(struct super_block *sb) | |
347 | { | |
e10b0808 | 348 | return (0); |
ab26409d BB |
349 | } |
350 | #endif /* HAVE_NR_CACHED_OBJECTS */ | |
351 | ||
352 | #ifdef HAVE_FREE_CACHED_OBJECTS | |
ab26409d BB |
353 | static void |
354 | zpl_free_cached_objects(struct super_block *sb, int nr_to_scan) | |
355 | { | |
ea04106b | 356 | /* noop */ |
ab26409d BB |
357 | } |
358 | #endif /* HAVE_FREE_CACHED_OBJECTS */ | |
359 | ||
51f0bbe4 | 360 | const struct super_operations zpl_super_operations = { |
ab26409d BB |
361 | .alloc_inode = zpl_inode_alloc, |
362 | .destroy_inode = zpl_inode_destroy, | |
8780c539 | 363 | .dirty_inode = zpl_dirty_inode, |
ab26409d | 364 | .write_inode = NULL, |
2c395def | 365 | #ifdef HAVE_EVICT_INODE |
ab26409d | 366 | .evict_inode = zpl_evict_inode, |
2c395def | 367 | #else |
ea04106b | 368 | .drop_inode = zpl_drop_inode, |
ab26409d BB |
369 | .clear_inode = zpl_clear_inode, |
370 | .delete_inode = zpl_inode_delete, | |
2c395def | 371 | #endif /* HAVE_EVICT_INODE */ |
ab26409d | 372 | .put_super = zpl_put_super, |
ab26409d BB |
373 | .sync_fs = zpl_sync_fs, |
374 | .statfs = zpl_statfs, | |
375 | .remount_fs = zpl_remount_fs, | |
376 | .show_options = zpl_show_options, | |
377 | .show_stats = NULL, | |
378 | #ifdef HAVE_NR_CACHED_OBJECTS | |
379 | .nr_cached_objects = zpl_nr_cached_objects, | |
380 | #endif /* HAVE_NR_CACHED_OBJECTS */ | |
381 | #ifdef HAVE_FREE_CACHED_OBJECTS | |
382 | .free_cached_objects = zpl_free_cached_objects, | |
383 | #endif /* HAVE_FREE_CACHED_OBJECTS */ | |
51f0bbe4 BB |
384 | }; |
385 | ||
51f0bbe4 | 386 | struct file_system_type zpl_fs_type = { |
ab26409d BB |
387 | .owner = THIS_MODULE, |
388 | .name = ZFS_DRIVER, | |
42f7b73b | 389 | #ifdef HAVE_FST_MOUNT |
ab26409d | 390 | .mount = zpl_mount, |
2cf7f52b | 391 | #else |
ab26409d | 392 | .get_sb = zpl_get_sb, |
42f7b73b | 393 | #endif /* HAVE_FST_MOUNT */ |
ab26409d | 394 | .kill_sb = zpl_kill_sb, |
51f0bbe4 | 395 | }; |