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b6450630 SF |
1 | /* |
2 | * Copyright (C) 2005-2017 Junjiro R. Okajima | |
3 | * | |
4 | * This program, aufs is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * judging filesystem type | |
20 | */ | |
21 | ||
22 | #ifndef __AUFS_FSTYPE_H__ | |
23 | #define __AUFS_FSTYPE_H__ | |
24 | ||
25 | #ifdef __KERNEL__ | |
26 | ||
27 | #include <linux/fs.h> | |
28 | #include <linux/magic.h> | |
29 | #include <linux/nfs_fs.h> | |
30 | #include <linux/romfs_fs.h> | |
31 | ||
32 | static inline int au_test_aufs(struct super_block *sb) | |
33 | { | |
34 | return sb->s_magic == AUFS_SUPER_MAGIC; | |
35 | } | |
36 | ||
37 | static inline const char *au_sbtype(struct super_block *sb) | |
38 | { | |
39 | return sb->s_type->name; | |
40 | } | |
41 | ||
42 | static inline int au_test_iso9660(struct super_block *sb __maybe_unused) | |
43 | { | |
44 | #if IS_ENABLED(CONFIG_ISO9660_FS) | |
45 | return sb->s_magic == ISOFS_SUPER_MAGIC; | |
46 | #else | |
47 | return 0; | |
48 | #endif | |
49 | } | |
50 | ||
51 | static inline int au_test_romfs(struct super_block *sb __maybe_unused) | |
52 | { | |
53 | #if IS_ENABLED(CONFIG_ROMFS_FS) | |
54 | return sb->s_magic == ROMFS_MAGIC; | |
55 | #else | |
56 | return 0; | |
57 | #endif | |
58 | } | |
59 | ||
60 | static inline int au_test_cramfs(struct super_block *sb __maybe_unused) | |
61 | { | |
62 | #if IS_ENABLED(CONFIG_CRAMFS) | |
63 | return sb->s_magic == CRAMFS_MAGIC; | |
64 | #endif | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static inline int au_test_nfs(struct super_block *sb __maybe_unused) | |
69 | { | |
70 | #if IS_ENABLED(CONFIG_NFS_FS) | |
71 | return sb->s_magic == NFS_SUPER_MAGIC; | |
72 | #else | |
73 | return 0; | |
74 | #endif | |
75 | } | |
76 | ||
77 | static inline int au_test_fuse(struct super_block *sb __maybe_unused) | |
78 | { | |
79 | #if IS_ENABLED(CONFIG_FUSE_FS) | |
80 | return sb->s_magic == FUSE_SUPER_MAGIC; | |
81 | #else | |
82 | return 0; | |
83 | #endif | |
84 | } | |
85 | ||
86 | static inline int au_test_xfs(struct super_block *sb __maybe_unused) | |
87 | { | |
88 | #if IS_ENABLED(CONFIG_XFS_FS) | |
89 | return sb->s_magic == XFS_SB_MAGIC; | |
90 | #else | |
91 | return 0; | |
92 | #endif | |
93 | } | |
94 | ||
95 | static inline int au_test_tmpfs(struct super_block *sb __maybe_unused) | |
96 | { | |
97 | #ifdef CONFIG_TMPFS | |
98 | return sb->s_magic == TMPFS_MAGIC; | |
99 | #else | |
100 | return 0; | |
101 | #endif | |
102 | } | |
103 | ||
104 | static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused) | |
105 | { | |
106 | #if IS_ENABLED(CONFIG_ECRYPT_FS) | |
107 | return !strcmp(au_sbtype(sb), "ecryptfs"); | |
108 | #else | |
109 | return 0; | |
110 | #endif | |
111 | } | |
112 | ||
113 | static inline int au_test_ramfs(struct super_block *sb) | |
114 | { | |
115 | return sb->s_magic == RAMFS_MAGIC; | |
116 | } | |
117 | ||
118 | static inline int au_test_ubifs(struct super_block *sb __maybe_unused) | |
119 | { | |
120 | #if IS_ENABLED(CONFIG_UBIFS_FS) | |
121 | return sb->s_magic == UBIFS_SUPER_MAGIC; | |
122 | #else | |
123 | return 0; | |
124 | #endif | |
125 | } | |
126 | ||
127 | static inline int au_test_procfs(struct super_block *sb __maybe_unused) | |
128 | { | |
129 | #ifdef CONFIG_PROC_FS | |
130 | return sb->s_magic == PROC_SUPER_MAGIC; | |
131 | #else | |
132 | return 0; | |
133 | #endif | |
134 | } | |
135 | ||
136 | static inline int au_test_sysfs(struct super_block *sb __maybe_unused) | |
137 | { | |
138 | #ifdef CONFIG_SYSFS | |
139 | return sb->s_magic == SYSFS_MAGIC; | |
140 | #else | |
141 | return 0; | |
142 | #endif | |
143 | } | |
144 | ||
145 | static inline int au_test_configfs(struct super_block *sb __maybe_unused) | |
146 | { | |
147 | #if IS_ENABLED(CONFIG_CONFIGFS_FS) | |
148 | return sb->s_magic == CONFIGFS_MAGIC; | |
149 | #else | |
150 | return 0; | |
151 | #endif | |
152 | } | |
153 | ||
154 | static inline int au_test_minix(struct super_block *sb __maybe_unused) | |
155 | { | |
156 | #if IS_ENABLED(CONFIG_MINIX_FS) | |
157 | return sb->s_magic == MINIX3_SUPER_MAGIC | |
158 | || sb->s_magic == MINIX2_SUPER_MAGIC | |
159 | || sb->s_magic == MINIX2_SUPER_MAGIC2 | |
160 | || sb->s_magic == MINIX_SUPER_MAGIC | |
161 | || sb->s_magic == MINIX_SUPER_MAGIC2; | |
162 | #else | |
163 | return 0; | |
164 | #endif | |
165 | } | |
166 | ||
167 | static inline int au_test_fat(struct super_block *sb __maybe_unused) | |
168 | { | |
169 | #if IS_ENABLED(CONFIG_FAT_FS) | |
170 | return sb->s_magic == MSDOS_SUPER_MAGIC; | |
171 | #else | |
172 | return 0; | |
173 | #endif | |
174 | } | |
175 | ||
176 | static inline int au_test_msdos(struct super_block *sb) | |
177 | { | |
178 | return au_test_fat(sb); | |
179 | } | |
180 | ||
181 | static inline int au_test_vfat(struct super_block *sb) | |
182 | { | |
183 | return au_test_fat(sb); | |
184 | } | |
185 | ||
186 | static inline int au_test_securityfs(struct super_block *sb __maybe_unused) | |
187 | { | |
188 | #ifdef CONFIG_SECURITYFS | |
189 | return sb->s_magic == SECURITYFS_MAGIC; | |
190 | #else | |
191 | return 0; | |
192 | #endif | |
193 | } | |
194 | ||
195 | static inline int au_test_squashfs(struct super_block *sb __maybe_unused) | |
196 | { | |
197 | #if IS_ENABLED(CONFIG_SQUASHFS) | |
198 | return sb->s_magic == SQUASHFS_MAGIC; | |
199 | #else | |
200 | return 0; | |
201 | #endif | |
202 | } | |
203 | ||
204 | static inline int au_test_btrfs(struct super_block *sb __maybe_unused) | |
205 | { | |
206 | #if IS_ENABLED(CONFIG_BTRFS_FS) | |
207 | return sb->s_magic == BTRFS_SUPER_MAGIC; | |
208 | #else | |
209 | return 0; | |
210 | #endif | |
211 | } | |
212 | ||
213 | static inline int au_test_xenfs(struct super_block *sb __maybe_unused) | |
214 | { | |
215 | #if IS_ENABLED(CONFIG_XENFS) | |
216 | return sb->s_magic == XENFS_SUPER_MAGIC; | |
217 | #else | |
218 | return 0; | |
219 | #endif | |
220 | } | |
221 | ||
222 | static inline int au_test_debugfs(struct super_block *sb __maybe_unused) | |
223 | { | |
224 | #ifdef CONFIG_DEBUG_FS | |
225 | return sb->s_magic == DEBUGFS_MAGIC; | |
226 | #else | |
227 | return 0; | |
228 | #endif | |
229 | } | |
230 | ||
231 | static inline int au_test_nilfs(struct super_block *sb __maybe_unused) | |
232 | { | |
233 | #if IS_ENABLED(CONFIG_NILFS) | |
234 | return sb->s_magic == NILFS_SUPER_MAGIC; | |
235 | #else | |
236 | return 0; | |
237 | #endif | |
238 | } | |
239 | ||
240 | static inline int au_test_hfsplus(struct super_block *sb __maybe_unused) | |
241 | { | |
242 | #if IS_ENABLED(CONFIG_HFSPLUS_FS) | |
243 | return sb->s_magic == HFSPLUS_SUPER_MAGIC; | |
244 | #else | |
245 | return 0; | |
246 | #endif | |
247 | } | |
248 | ||
249 | /* ---------------------------------------------------------------------- */ | |
250 | /* | |
251 | * they can't be an aufs branch. | |
252 | */ | |
253 | static inline int au_test_fs_unsuppoted(struct super_block *sb) | |
254 | { | |
255 | return | |
256 | #ifndef CONFIG_AUFS_BR_RAMFS | |
257 | au_test_ramfs(sb) || | |
258 | #endif | |
259 | au_test_procfs(sb) | |
260 | || au_test_sysfs(sb) | |
261 | || au_test_configfs(sb) | |
262 | || au_test_debugfs(sb) | |
263 | || au_test_securityfs(sb) | |
264 | || au_test_xenfs(sb) | |
265 | || au_test_ecryptfs(sb) | |
266 | /* || !strcmp(au_sbtype(sb), "unionfs") */ | |
267 | || au_test_aufs(sb); /* will be supported in next version */ | |
268 | } | |
269 | ||
270 | static inline int au_test_fs_remote(struct super_block *sb) | |
271 | { | |
272 | return !au_test_tmpfs(sb) | |
273 | #ifdef CONFIG_AUFS_BR_RAMFS | |
274 | && !au_test_ramfs(sb) | |
275 | #endif | |
276 | && !(sb->s_type->fs_flags & FS_REQUIRES_DEV); | |
277 | } | |
278 | ||
279 | /* ---------------------------------------------------------------------- */ | |
280 | ||
281 | /* | |
282 | * Note: these functions (below) are created after reading ->getattr() in all | |
283 | * filesystems under linux/fs. it means we have to do so in every update... | |
284 | */ | |
285 | ||
286 | /* | |
287 | * some filesystems require getattr to refresh the inode attributes before | |
288 | * referencing. | |
289 | * in most cases, we can rely on the inode attribute in NFS (or every remote fs) | |
290 | * and leave the work for d_revalidate() | |
291 | */ | |
292 | static inline int au_test_fs_refresh_iattr(struct super_block *sb) | |
293 | { | |
294 | return au_test_nfs(sb) | |
295 | || au_test_fuse(sb) | |
296 | /* || au_test_btrfs(sb) */ /* untested */ | |
297 | ; | |
298 | } | |
299 | ||
300 | /* | |
301 | * filesystems which don't maintain i_size or i_blocks. | |
302 | */ | |
303 | static inline int au_test_fs_bad_iattr_size(struct super_block *sb) | |
304 | { | |
305 | return au_test_xfs(sb) | |
306 | || au_test_btrfs(sb) | |
307 | || au_test_ubifs(sb) | |
308 | || au_test_hfsplus(sb) /* maintained, but incorrect */ | |
309 | /* || au_test_minix(sb) */ /* untested */ | |
310 | ; | |
311 | } | |
312 | ||
313 | /* | |
314 | * filesystems which don't store the correct value in some of their inode | |
315 | * attributes. | |
316 | */ | |
317 | static inline int au_test_fs_bad_iattr(struct super_block *sb) | |
318 | { | |
319 | return au_test_fs_bad_iattr_size(sb) | |
320 | || au_test_fat(sb) | |
321 | || au_test_msdos(sb) | |
322 | || au_test_vfat(sb); | |
323 | } | |
324 | ||
325 | /* they don't check i_nlink in link(2) */ | |
326 | static inline int au_test_fs_no_limit_nlink(struct super_block *sb) | |
327 | { | |
328 | return au_test_tmpfs(sb) | |
329 | #ifdef CONFIG_AUFS_BR_RAMFS | |
330 | || au_test_ramfs(sb) | |
331 | #endif | |
332 | || au_test_ubifs(sb) | |
333 | || au_test_hfsplus(sb); | |
334 | } | |
335 | ||
336 | /* | |
337 | * filesystems which sets S_NOATIME and S_NOCMTIME. | |
338 | */ | |
339 | static inline int au_test_fs_notime(struct super_block *sb) | |
340 | { | |
341 | return au_test_nfs(sb) | |
342 | || au_test_fuse(sb) | |
343 | || au_test_ubifs(sb) | |
344 | ; | |
345 | } | |
346 | ||
347 | /* temporary support for i#1 in cramfs */ | |
348 | static inline int au_test_fs_unique_ino(struct inode *inode) | |
349 | { | |
350 | if (au_test_cramfs(inode->i_sb)) | |
351 | return inode->i_ino != 1; | |
352 | return 1; | |
353 | } | |
354 | ||
355 | /* ---------------------------------------------------------------------- */ | |
356 | ||
357 | /* | |
358 | * the filesystem where the xino files placed must support i/o after unlink and | |
359 | * maintain i_size and i_blocks. | |
360 | */ | |
361 | static inline int au_test_fs_bad_xino(struct super_block *sb) | |
362 | { | |
363 | return au_test_fs_remote(sb) | |
364 | || au_test_fs_bad_iattr_size(sb) | |
365 | /* don't want unnecessary work for xino */ | |
366 | || au_test_aufs(sb) | |
367 | || au_test_ecryptfs(sb) | |
368 | || au_test_nilfs(sb); | |
369 | } | |
370 | ||
371 | static inline int au_test_fs_trunc_xino(struct super_block *sb) | |
372 | { | |
373 | return au_test_tmpfs(sb) | |
374 | || au_test_ramfs(sb); | |
375 | } | |
376 | ||
377 | /* | |
378 | * test if the @sb is real-readonly. | |
379 | */ | |
380 | static inline int au_test_fs_rr(struct super_block *sb) | |
381 | { | |
382 | return au_test_squashfs(sb) | |
383 | || au_test_iso9660(sb) | |
384 | || au_test_cramfs(sb) | |
385 | || au_test_romfs(sb); | |
386 | } | |
387 | ||
388 | /* | |
389 | * test if the @inode is nfs with 'noacl' option | |
390 | * NFS always sets MS_POSIXACL regardless its mount option 'noacl.' | |
391 | */ | |
392 | static inline int au_test_nfs_noacl(struct inode *inode) | |
393 | { | |
394 | return au_test_nfs(inode->i_sb) | |
395 | /* && IS_POSIXACL(inode) */ | |
396 | && !nfs_server_capable(inode, NFS_CAP_ACLS); | |
397 | } | |
398 | ||
399 | #endif /* __KERNEL__ */ | |
400 | #endif /* __AUFS_FSTYPE_H__ */ |