Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | |
2 | /* | |
3 | * Directory operations for Coda filesystem | |
4 | * Original version: (C) 1996 P. Braam and M. Callahan | |
5 | * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University | |
6 | * | |
7 | * Carnegie Mellon encourages users to contribute improvements to | |
8 | * the Coda project. Contact Peter Braam (coda@cs.cmu.edu). | |
9 | */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/time.h> | |
14 | #include <linux/fs.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
16 | #include <linux/file.h> |
17 | #include <linux/stat.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/string.h> | |
b5ce1d83 | 20 | #include <linux/spinlock.h> |
34286d66 | 21 | #include <linux/namei.h> |
834b46c3 | 22 | #include <linux/uaccess.h> |
1da177e4 LT |
23 | |
24 | #include <linux/coda.h> | |
1da177e4 | 25 | #include <linux/coda_psdev.h> |
31a203df AV |
26 | #include "coda_linux.h" |
27 | #include "coda_cache.h" | |
1da177e4 | 28 | |
c98d8cfb AB |
29 | #include "coda_int.h" |
30 | ||
1da177e4 LT |
31 | /* same as fs/bad_inode.c */ |
32 | static int coda_return_EIO(void) | |
33 | { | |
34 | return -EIO; | |
35 | } | |
36 | #define CODA_EIO_ERROR ((void *) (coda_return_EIO)) | |
37 | ||
1da177e4 LT |
38 | /* inode operations for directories */ |
39 | /* access routines: lookup, readlink, permission */ | |
00cd8dd3 | 40 | static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags) |
1da177e4 | 41 | { |
f4947fbc | 42 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
43 | const char *name = entry->d_name.name; |
44 | size_t length = entry->d_name.len; | |
f4947fbc AV |
45 | struct inode *inode; |
46 | int type = 0; | |
ed36f723 JH |
47 | |
48 | if (length > CODA_MAXNAMLEN) { | |
d9b4b319 | 49 | pr_err("name too long: lookup, %s (%*s)\n", |
1da177e4 LT |
50 | coda_i2s(dir), (int)length, name); |
51 | return ERR_PTR(-ENAMETOOLONG); | |
52 | } | |
53 | ||
ed36f723 | 54 | /* control object, create inode on the fly */ |
a7400222 | 55 | if (is_root_inode(dir) && coda_iscontrol(name, length)) { |
f4947fbc | 56 | inode = coda_cnode_makectl(sb); |
ed36f723 | 57 | type = CODA_NOCACHE; |
f4947fbc AV |
58 | } else { |
59 | struct CodaFid fid = { { 0, } }; | |
60 | int error = venus_lookup(sb, coda_i2f(dir), name, length, | |
61 | &type, &fid); | |
62 | inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error); | |
ed36f723 JH |
63 | } |
64 | ||
f4947fbc | 65 | if (!IS_ERR(inode) && (type & CODA_NOCACHE)) |
ed36f723 JH |
66 | coda_flag_inode(inode, C_VATTR | C_PURGE); |
67 | ||
f4947fbc AV |
68 | if (inode == ERR_PTR(-ENOENT)) |
69 | inode = NULL; | |
70 | ||
ed36f723 | 71 | return d_splice_alias(inode, entry); |
1da177e4 LT |
72 | } |
73 | ||
74 | ||
10556cb2 | 75 | int coda_permission(struct inode *inode, int mask) |
1da177e4 | 76 | { |
f7cc02b8 | 77 | int error; |
e6305c43 | 78 | |
10556cb2 | 79 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
80 | return -ECHILD; |
81 | ||
e6305c43 | 82 | mask &= MAY_READ | MAY_WRITE | MAY_EXEC; |
1da177e4 LT |
83 | |
84 | if (!mask) | |
f7cc02b8 | 85 | return 0; |
1da177e4 | 86 | |
f696a365 MS |
87 | if ((mask & MAY_EXEC) && !execute_ok(inode)) |
88 | return -EACCES; | |
89 | ||
1da177e4 | 90 | if (coda_cache_check(inode, mask)) |
f7cc02b8 | 91 | return 0; |
1da177e4 | 92 | |
f7cc02b8 | 93 | error = venus_access(inode->i_sb, coda_i2f(inode), mask); |
1da177e4 LT |
94 | |
95 | if (!error) | |
96 | coda_cache_enter(inode, mask); | |
97 | ||
d728900c | 98 | return error; |
1da177e4 LT |
99 | } |
100 | ||
101 | ||
d728900c | 102 | static inline void coda_dir_update_mtime(struct inode *dir) |
1da177e4 LT |
103 | { |
104 | #ifdef REQUERY_VENUS_FOR_MTIME | |
105 | /* invalidate the directory cnode's attributes so we refetch the | |
106 | * attributes from venus next time the inode is referenced */ | |
107 | coda_flag_inode(dir, C_VATTR); | |
108 | #else | |
109 | /* optimistically we can also act as if our nose bleeds. The | |
d728900c JH |
110 | * granularity of the mtime is coarse anyways so we might actually be |
111 | * right most of the time. Note: we only do this for directories. */ | |
1da177e4 LT |
112 | dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; |
113 | #endif | |
d728900c JH |
114 | } |
115 | ||
116 | /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a | |
117 | * trick to fool GNU find's optimizations. If we can't be sure of the link | |
118 | * (because of volume mount points) we set i_nlink to 1 which forces find | |
119 | * to consider every child as a possible directory. We should also never | |
120 | * see an increment or decrement for deleted directories where i_nlink == 0 */ | |
121 | static inline void coda_dir_inc_nlink(struct inode *dir) | |
122 | { | |
123 | if (dir->i_nlink >= 2) | |
124 | inc_nlink(dir); | |
125 | } | |
126 | ||
127 | static inline void coda_dir_drop_nlink(struct inode *dir) | |
128 | { | |
129 | if (dir->i_nlink > 2) | |
130 | drop_nlink(dir); | |
1da177e4 LT |
131 | } |
132 | ||
133 | /* creation routines: create, mknod, mkdir, link, symlink */ | |
ebfc3b49 | 134 | static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl) |
1da177e4 | 135 | { |
f7cc02b8 | 136 | int error; |
1da177e4 LT |
137 | const char *name=de->d_name.name; |
138 | int length=de->d_name.len; | |
139 | struct inode *inode; | |
140 | struct CodaFid newfid; | |
141 | struct coda_vattr attrs; | |
142 | ||
a7400222 | 143 | if (is_root_inode(dir) && coda_iscontrol(name, length)) |
1da177e4 | 144 | return -EPERM; |
1da177e4 LT |
145 | |
146 | error = venus_create(dir->i_sb, coda_i2f(dir), name, length, | |
147 | 0, mode, &newfid, &attrs); | |
f7cc02b8 YA |
148 | if (error) |
149 | goto err_out; | |
1da177e4 LT |
150 | |
151 | inode = coda_iget(dir->i_sb, &newfid, &attrs); | |
f7cc02b8 YA |
152 | if (IS_ERR(inode)) { |
153 | error = PTR_ERR(inode); | |
154 | goto err_out; | |
1da177e4 LT |
155 | } |
156 | ||
157 | /* invalidate the directory cnode's attributes */ | |
d728900c | 158 | coda_dir_update_mtime(dir); |
1da177e4 | 159 | d_instantiate(de, inode); |
d728900c | 160 | return 0; |
f7cc02b8 YA |
161 | err_out: |
162 | d_drop(de); | |
163 | return error; | |
1da177e4 LT |
164 | } |
165 | ||
18bb1db3 | 166 | static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode) |
1da177e4 LT |
167 | { |
168 | struct inode *inode; | |
169 | struct coda_vattr attrs; | |
170 | const char *name = de->d_name.name; | |
171 | int len = de->d_name.len; | |
172 | int error; | |
173 | struct CodaFid newfid; | |
174 | ||
a7400222 | 175 | if (is_root_inode(dir) && coda_iscontrol(name, len)) |
1da177e4 | 176 | return -EPERM; |
1da177e4 LT |
177 | |
178 | attrs.va_mode = mode; | |
179 | error = venus_mkdir(dir->i_sb, coda_i2f(dir), | |
180 | name, len, &newfid, &attrs); | |
f7cc02b8 YA |
181 | if (error) |
182 | goto err_out; | |
1da177e4 LT |
183 | |
184 | inode = coda_iget(dir->i_sb, &newfid, &attrs); | |
f7cc02b8 YA |
185 | if (IS_ERR(inode)) { |
186 | error = PTR_ERR(inode); | |
187 | goto err_out; | |
1da177e4 | 188 | } |
d728900c | 189 | |
1da177e4 | 190 | /* invalidate the directory cnode's attributes */ |
d728900c JH |
191 | coda_dir_inc_nlink(dir); |
192 | coda_dir_update_mtime(dir); | |
1da177e4 | 193 | d_instantiate(de, inode); |
d728900c | 194 | return 0; |
f7cc02b8 YA |
195 | err_out: |
196 | d_drop(de); | |
197 | return error; | |
1da177e4 LT |
198 | } |
199 | ||
200 | /* try to make de an entry in dir_inodde linked to source_de */ | |
201 | static int coda_link(struct dentry *source_de, struct inode *dir_inode, | |
202 | struct dentry *de) | |
203 | { | |
204 | struct inode *inode = source_de->d_inode; | |
205 | const char * name = de->d_name.name; | |
206 | int len = de->d_name.len; | |
207 | int error; | |
208 | ||
a7400222 | 209 | if (is_root_inode(dir_inode) && coda_iscontrol(name, len)) |
1da177e4 | 210 | return -EPERM; |
1da177e4 LT |
211 | |
212 | error = venus_link(dir_inode->i_sb, coda_i2f(inode), | |
213 | coda_i2f(dir_inode), (const char *)name, len); | |
d728900c | 214 | if (error) { |
1da177e4 | 215 | d_drop(de); |
f7cc02b8 | 216 | return error; |
1da177e4 LT |
217 | } |
218 | ||
d728900c | 219 | coda_dir_update_mtime(dir_inode); |
7de9c6ee | 220 | ihold(inode); |
1da177e4 | 221 | d_instantiate(de, inode); |
d8c76e6f | 222 | inc_nlink(inode); |
f7cc02b8 | 223 | return 0; |
1da177e4 LT |
224 | } |
225 | ||
226 | ||
227 | static int coda_symlink(struct inode *dir_inode, struct dentry *de, | |
228 | const char *symname) | |
229 | { | |
f7cc02b8 | 230 | const char *name = de->d_name.name; |
1da177e4 LT |
231 | int len = de->d_name.len; |
232 | int symlen; | |
f7cc02b8 | 233 | int error; |
1da177e4 | 234 | |
a7400222 | 235 | if (is_root_inode(dir_inode) && coda_iscontrol(name, len)) |
1da177e4 | 236 | return -EPERM; |
1da177e4 LT |
237 | |
238 | symlen = strlen(symname); | |
f7cc02b8 | 239 | if (symlen > CODA_MAXPATHLEN) |
1da177e4 | 240 | return -ENAMETOOLONG; |
1da177e4 LT |
241 | |
242 | /* | |
243 | * This entry is now negative. Since we do not create | |
d728900c | 244 | * an inode for the entry we have to drop it. |
1da177e4 LT |
245 | */ |
246 | d_drop(de); | |
d728900c | 247 | error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, |
1da177e4 LT |
248 | symname, symlen); |
249 | ||
250 | /* mtime is no good anymore */ | |
f7cc02b8 | 251 | if (!error) |
d728900c | 252 | coda_dir_update_mtime(dir_inode); |
1da177e4 | 253 | |
d728900c | 254 | return error; |
1da177e4 LT |
255 | } |
256 | ||
257 | /* destruction routines: unlink, rmdir */ | |
9fe76c76 | 258 | static int coda_unlink(struct inode *dir, struct dentry *de) |
1da177e4 LT |
259 | { |
260 | int error; | |
261 | const char *name = de->d_name.name; | |
262 | int len = de->d_name.len; | |
263 | ||
d728900c | 264 | error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); |
f7cc02b8 | 265 | if (error) |
d728900c | 266 | return error; |
1da177e4 | 267 | |
d728900c | 268 | coda_dir_update_mtime(dir); |
9a53c3a7 | 269 | drop_nlink(de->d_inode); |
d728900c | 270 | return 0; |
1da177e4 LT |
271 | } |
272 | ||
9fe76c76 | 273 | static int coda_rmdir(struct inode *dir, struct dentry *de) |
1da177e4 LT |
274 | { |
275 | const char *name = de->d_name.name; | |
276 | int len = de->d_name.len; | |
8c6d2152 | 277 | int error; |
1da177e4 | 278 | |
1da177e4 | 279 | error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); |
8c6d2152 JH |
280 | if (!error) { |
281 | /* VFS may delete the child */ | |
282 | if (de->d_inode) | |
6d6b77f1 | 283 | clear_nlink(de->d_inode); |
1da177e4 | 284 | |
8c6d2152 JH |
285 | /* fix the link count of the parent */ |
286 | coda_dir_drop_nlink(dir); | |
287 | coda_dir_update_mtime(dir); | |
d728900c | 288 | } |
8c6d2152 | 289 | return error; |
1da177e4 LT |
290 | } |
291 | ||
292 | /* rename */ | |
d728900c | 293 | static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, |
1da177e4 LT |
294 | struct inode *new_dir, struct dentry *new_dentry) |
295 | { | |
d728900c JH |
296 | const char *old_name = old_dentry->d_name.name; |
297 | const char *new_name = new_dentry->d_name.name; | |
1da177e4 LT |
298 | int old_length = old_dentry->d_name.len; |
299 | int new_length = new_dentry->d_name.len; | |
d728900c | 300 | int error; |
1da177e4 | 301 | |
d728900c JH |
302 | error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), |
303 | coda_i2f(new_dir), old_length, new_length, | |
1da177e4 | 304 | (const char *) old_name, (const char *)new_name); |
f7cc02b8 YA |
305 | if (!error) { |
306 | if (new_dentry->d_inode) { | |
307 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
d728900c JH |
308 | coda_dir_drop_nlink(old_dir); |
309 | coda_dir_inc_nlink(new_dir); | |
310 | } | |
311 | coda_dir_update_mtime(old_dir); | |
312 | coda_dir_update_mtime(new_dir); | |
1da177e4 LT |
313 | coda_flag_inode(new_dentry->d_inode, C_VATTR); |
314 | } else { | |
315 | coda_flag_inode(old_dir, C_VATTR); | |
316 | coda_flag_inode(new_dir, C_VATTR); | |
d728900c | 317 | } |
1da177e4 | 318 | } |
1da177e4 LT |
319 | return error; |
320 | } | |
321 | ||
1da177e4 LT |
322 | static inline unsigned int CDT2DT(unsigned char cdt) |
323 | { | |
324 | unsigned int dt; | |
325 | ||
326 | switch(cdt) { | |
327 | case CDT_UNKNOWN: dt = DT_UNKNOWN; break; | |
328 | case CDT_FIFO: dt = DT_FIFO; break; | |
329 | case CDT_CHR: dt = DT_CHR; break; | |
330 | case CDT_DIR: dt = DT_DIR; break; | |
331 | case CDT_BLK: dt = DT_BLK; break; | |
332 | case CDT_REG: dt = DT_REG; break; | |
333 | case CDT_LNK: dt = DT_LNK; break; | |
334 | case CDT_SOCK: dt = DT_SOCK; break; | |
335 | case CDT_WHT: dt = DT_WHT; break; | |
336 | default: dt = DT_UNKNOWN; break; | |
337 | } | |
338 | return dt; | |
339 | } | |
340 | ||
341 | /* support routines */ | |
e924f251 | 342 | static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx) |
1da177e4 | 343 | { |
97875253 JH |
344 | struct coda_file_info *cfi; |
345 | struct coda_inode_info *cii; | |
346 | struct file *host_file; | |
1da177e4 | 347 | struct venus_dirent *vdir; |
ee60498f | 348 | unsigned long vdir_size = offsetof(struct venus_dirent, d_name); |
1da177e4 LT |
349 | unsigned int type; |
350 | struct qstr name; | |
351 | ino_t ino; | |
97875253 JH |
352 | int ret; |
353 | ||
354 | cfi = CODA_FTOC(coda_file); | |
355 | BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); | |
356 | host_file = cfi->cfi_container; | |
357 | ||
93fe74b2 | 358 | cii = ITOC(file_inode(coda_file)); |
1da177e4 | 359 | |
f52720ca | 360 | vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); |
1da177e4 LT |
361 | if (!vdir) return -ENOMEM; |
362 | ||
e924f251 AV |
363 | if (!dir_emit_dots(coda_file, ctx)) |
364 | goto out; | |
365 | ||
1da177e4 LT |
366 | while (1) { |
367 | /* read entries from the directory file */ | |
e924f251 | 368 | ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir, |
1da177e4 LT |
369 | sizeof(*vdir)); |
370 | if (ret < 0) { | |
6d6bd94f FF |
371 | pr_err("%s: read dir %s failed %d\n", |
372 | __func__, coda_f2s(&cii->c_fid), ret); | |
1da177e4 LT |
373 | break; |
374 | } | |
375 | if (ret == 0) break; /* end of directory file reached */ | |
376 | ||
377 | /* catch truncated reads */ | |
378 | if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { | |
6d6bd94f FF |
379 | pr_err("%s: short read on %s\n", |
380 | __func__, coda_f2s(&cii->c_fid)); | |
1da177e4 LT |
381 | ret = -EBADF; |
382 | break; | |
383 | } | |
384 | /* validate whether the directory file actually makes sense */ | |
385 | if (vdir->d_reclen < vdir_size + vdir->d_namlen) { | |
6d6bd94f FF |
386 | pr_err("%s: invalid dir %s\n", |
387 | __func__, coda_f2s(&cii->c_fid)); | |
1da177e4 LT |
388 | ret = -EBADF; |
389 | break; | |
390 | } | |
391 | ||
392 | name.len = vdir->d_namlen; | |
393 | name.name = vdir->d_name; | |
394 | ||
395 | /* Make sure we skip '.' and '..', we already got those */ | |
396 | if (name.name[0] == '.' && (name.len == 1 || | |
e924f251 | 397 | (name.name[1] == '.' && name.len == 2))) |
1da177e4 LT |
398 | vdir->d_fileno = name.len = 0; |
399 | ||
400 | /* skip null entries */ | |
401 | if (vdir->d_fileno && name.len) { | |
6b5e1223 | 402 | ino = vdir->d_fileno; |
1da177e4 | 403 | type = CDT2DT(vdir->d_type); |
e924f251 AV |
404 | if (!dir_emit(ctx, name.name, name.len, ino, type)) |
405 | break; | |
1da177e4 LT |
406 | } |
407 | /* we'll always have progress because d_reclen is unsigned and | |
408 | * we've already established it is non-zero. */ | |
e924f251 | 409 | ctx->pos += vdir->d_reclen; |
97875253 | 410 | } |
5f47c7ea | 411 | out: |
1da177e4 | 412 | kfree(vdir); |
e924f251 | 413 | return 0; |
1da177e4 LT |
414 | } |
415 | ||
b625032b FF |
416 | /* file operations for directories */ |
417 | static int coda_readdir(struct file *coda_file, struct dir_context *ctx) | |
418 | { | |
419 | struct coda_file_info *cfi; | |
420 | struct file *host_file; | |
421 | int ret; | |
422 | ||
423 | cfi = CODA_FTOC(coda_file); | |
424 | BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); | |
425 | host_file = cfi->cfi_container; | |
426 | ||
427 | if (host_file->f_op->iterate) { | |
428 | struct inode *host_inode = file_inode(host_file); | |
429 | ||
430 | mutex_lock(&host_inode->i_mutex); | |
431 | ret = -ENOENT; | |
432 | if (!IS_DEADDIR(host_inode)) { | |
433 | ret = host_file->f_op->iterate(host_file, ctx); | |
434 | file_accessed(host_file); | |
435 | } | |
436 | mutex_unlock(&host_inode->i_mutex); | |
437 | return ret; | |
438 | } | |
439 | /* Venus: we must read Venus dirents from a file */ | |
440 | return coda_venus_readdir(coda_file, ctx); | |
441 | } | |
442 | ||
1da177e4 | 443 | /* called when a cache lookup succeeds */ |
0b728e19 | 444 | static int coda_dentry_revalidate(struct dentry *de, unsigned int flags) |
1da177e4 | 445 | { |
34286d66 | 446 | struct inode *inode; |
1da177e4 LT |
447 | struct coda_inode_info *cii; |
448 | ||
0b728e19 | 449 | if (flags & LOOKUP_RCU) |
34286d66 NP |
450 | return -ECHILD; |
451 | ||
452 | inode = de->d_inode; | |
a7400222 | 453 | if (!inode || is_root_inode(inode)) |
1da177e4 LT |
454 | goto out; |
455 | if (is_bad_inode(inode)) | |
456 | goto bad; | |
457 | ||
458 | cii = ITOC(de->d_inode); | |
459 | if (!(cii->c_flags & (C_PURGE | C_FLUSH))) | |
460 | goto out; | |
461 | ||
462 | shrink_dcache_parent(de); | |
463 | ||
464 | /* propagate for a flush */ | |
465 | if (cii->c_flags & C_FLUSH) | |
466 | coda_flag_inode_children(inode, C_FLUSH); | |
467 | ||
84d08fa8 | 468 | if (d_count(de) > 1) |
1da177e4 LT |
469 | /* pretend it's valid, but don't change the flags */ |
470 | goto out; | |
471 | ||
472 | /* clear the flags. */ | |
b5ce1d83 | 473 | spin_lock(&cii->c_lock); |
1da177e4 | 474 | cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); |
b5ce1d83 | 475 | spin_unlock(&cii->c_lock); |
1da177e4 | 476 | bad: |
1da177e4 LT |
477 | return 0; |
478 | out: | |
1da177e4 LT |
479 | return 1; |
480 | } | |
481 | ||
482 | /* | |
483 | * This is the callback from dput() when d_count is going to 0. | |
484 | * We use this to unhash dentries with bad inodes. | |
485 | */ | |
fe15ce44 | 486 | static int coda_dentry_delete(const struct dentry * dentry) |
1da177e4 LT |
487 | { |
488 | int flags; | |
489 | ||
490 | if (!dentry->d_inode) | |
491 | return 0; | |
492 | ||
493 | flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; | |
494 | if (is_bad_inode(dentry->d_inode) || flags) { | |
495 | return 1; | |
496 | } | |
497 | return 0; | |
498 | } | |
499 | ||
500 | ||
501 | ||
502 | /* | |
503 | * This is called when we want to check if the inode has | |
504 | * changed on the server. Coda makes this easy since the | |
505 | * cache manager Venus issues a downcall to the kernel when this | |
506 | * happens | |
507 | */ | |
11d100d9 | 508 | int coda_revalidate_inode(struct inode *inode) |
1da177e4 LT |
509 | { |
510 | struct coda_vattr attr; | |
f7cc02b8 | 511 | int error; |
1da177e4 LT |
512 | int old_mode; |
513 | ino_t old_ino; | |
1da177e4 LT |
514 | struct coda_inode_info *cii = ITOC(inode); |
515 | ||
f7cc02b8 YA |
516 | if (!cii->c_flags) |
517 | return 0; | |
1da177e4 LT |
518 | |
519 | if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { | |
520 | error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); | |
f7cc02b8 YA |
521 | if (error) |
522 | return -EIO; | |
1da177e4 LT |
523 | |
524 | /* this inode may be lost if: | |
525 | - it's ino changed | |
526 | - type changes must be permitted for repair and | |
527 | missing mount points. | |
528 | */ | |
529 | old_mode = inode->i_mode; | |
530 | old_ino = inode->i_ino; | |
531 | coda_vattr_to_iattr(inode, &attr); | |
532 | ||
533 | if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { | |
f38cfb25 | 534 | pr_warn("inode %ld, fid %s changed type!\n", |
d9b4b319 | 535 | inode->i_ino, coda_f2s(&(cii->c_fid))); |
1da177e4 LT |
536 | } |
537 | ||
538 | /* the following can happen when a local fid is replaced | |
539 | with a global one, here we lose and declare the inode bad */ | |
540 | if (inode->i_ino != old_ino) | |
f7cc02b8 | 541 | return -EIO; |
1da177e4 LT |
542 | |
543 | coda_flag_inode_children(inode, C_FLUSH); | |
b5ce1d83 YA |
544 | |
545 | spin_lock(&cii->c_lock); | |
1da177e4 | 546 | cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); |
b5ce1d83 | 547 | spin_unlock(&cii->c_lock); |
1da177e4 | 548 | } |
1da177e4 | 549 | return 0; |
1da177e4 | 550 | } |
b625032b FF |
551 | |
552 | const struct dentry_operations coda_dentry_operations = { | |
553 | .d_revalidate = coda_dentry_revalidate, | |
554 | .d_delete = coda_dentry_delete, | |
555 | }; | |
556 | ||
557 | const struct inode_operations coda_dir_inode_operations = { | |
558 | .create = coda_create, | |
559 | .lookup = coda_lookup, | |
560 | .link = coda_link, | |
561 | .unlink = coda_unlink, | |
562 | .symlink = coda_symlink, | |
563 | .mkdir = coda_mkdir, | |
564 | .rmdir = coda_rmdir, | |
565 | .mknod = CODA_EIO_ERROR, | |
566 | .rename = coda_rename, | |
567 | .permission = coda_permission, | |
568 | .getattr = coda_getattr, | |
569 | .setattr = coda_setattr, | |
570 | }; | |
571 | ||
572 | const struct file_operations coda_dir_operations = { | |
573 | .llseek = generic_file_llseek, | |
574 | .read = generic_read_dir, | |
575 | .iterate = coda_readdir, | |
576 | .open = coda_open, | |
577 | .release = coda_release, | |
578 | .fsync = coda_fsync, | |
579 | }; |