Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/affs/inode.c | |
3 | * | |
4 | * (c) 1996 Hans-Joachim Widmaier - Rewritten | |
5 | * | |
6 | * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. | |
7 | * | |
8 | * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem. | |
9 | * | |
10 | * (C) 1991 Linus Torvalds - minix filesystem | |
11 | */ | |
e8edc6e0 | 12 | #include <linux/sched.h> |
1da177e4 LT |
13 | #include "affs.h" |
14 | ||
754661f1 | 15 | extern const struct inode_operations affs_symlink_inode_operations; |
1da177e4 LT |
16 | extern struct timezone sys_tz; |
17 | ||
210f8559 | 18 | struct inode *affs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 19 | { |
1da177e4 LT |
20 | struct affs_sb_info *sbi = AFFS_SB(sb); |
21 | struct buffer_head *bh; | |
22 | struct affs_head *head; | |
23 | struct affs_tail *tail; | |
210f8559 | 24 | struct inode *inode; |
1da177e4 LT |
25 | u32 block; |
26 | u32 size; | |
27 | u32 prot; | |
28 | u16 id; | |
29 | ||
210f8559 DH |
30 | inode = iget_locked(sb, ino); |
31 | if (!inode) | |
32 | return ERR_PTR(-ENOMEM); | |
33 | if (!(inode->i_state & I_NEW)) | |
34 | return inode; | |
35 | ||
36 | pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino); | |
1da177e4 LT |
37 | |
38 | block = inode->i_ino; | |
39 | bh = affs_bread(sb, block); | |
40 | if (!bh) { | |
41 | affs_warning(sb, "read_inode", "Cannot read block %d", block); | |
42 | goto bad_inode; | |
43 | } | |
44 | if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { | |
45 | affs_warning(sb,"read_inode", | |
46 | "Checksum or type (ptype=%d) error on inode %d", | |
47 | AFFS_HEAD(bh)->ptype, block); | |
48 | goto bad_inode; | |
49 | } | |
50 | ||
51 | head = AFFS_HEAD(bh); | |
52 | tail = AFFS_TAIL(sb, bh); | |
53 | prot = be32_to_cpu(tail->protect); | |
54 | ||
55 | inode->i_size = 0; | |
56 | inode->i_nlink = 1; | |
57 | inode->i_mode = 0; | |
58 | AFFS_I(inode)->i_extcnt = 1; | |
59 | AFFS_I(inode)->i_ext_last = ~1; | |
60 | AFFS_I(inode)->i_protect = prot; | |
61 | AFFS_I(inode)->i_opencnt = 0; | |
62 | AFFS_I(inode)->i_blkcnt = 0; | |
63 | AFFS_I(inode)->i_lc = NULL; | |
64 | AFFS_I(inode)->i_lc_size = 0; | |
65 | AFFS_I(inode)->i_lc_shift = 0; | |
66 | AFFS_I(inode)->i_lc_mask = 0; | |
67 | AFFS_I(inode)->i_ac = NULL; | |
68 | AFFS_I(inode)->i_ext_bh = NULL; | |
69 | AFFS_I(inode)->mmu_private = 0; | |
70 | AFFS_I(inode)->i_lastalloc = 0; | |
71 | AFFS_I(inode)->i_pa_cnt = 0; | |
72 | ||
73 | if (sbi->s_flags & SF_SETMODE) | |
74 | inode->i_mode = sbi->s_mode; | |
75 | else | |
76 | inode->i_mode = prot_to_mode(prot); | |
77 | ||
78 | id = be16_to_cpu(tail->uid); | |
79 | if (id == 0 || sbi->s_flags & SF_SETUID) | |
80 | inode->i_uid = sbi->s_uid; | |
81 | else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) | |
82 | inode->i_uid = 0; | |
83 | else | |
84 | inode->i_uid = id; | |
85 | ||
86 | id = be16_to_cpu(tail->gid); | |
87 | if (id == 0 || sbi->s_flags & SF_SETGID) | |
88 | inode->i_gid = sbi->s_gid; | |
89 | else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) | |
90 | inode->i_gid = 0; | |
91 | else | |
92 | inode->i_gid = id; | |
93 | ||
94 | switch (be32_to_cpu(tail->stype)) { | |
95 | case ST_ROOT: | |
96 | inode->i_uid = sbi->s_uid; | |
97 | inode->i_gid = sbi->s_gid; | |
98 | /* fall through */ | |
99 | case ST_USERDIR: | |
100 | if (be32_to_cpu(tail->stype) == ST_USERDIR || | |
101 | sbi->s_flags & SF_SETMODE) { | |
102 | if (inode->i_mode & S_IRUSR) | |
103 | inode->i_mode |= S_IXUSR; | |
104 | if (inode->i_mode & S_IRGRP) | |
105 | inode->i_mode |= S_IXGRP; | |
106 | if (inode->i_mode & S_IROTH) | |
107 | inode->i_mode |= S_IXOTH; | |
108 | inode->i_mode |= S_IFDIR; | |
109 | } else | |
110 | inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; | |
111 | if (tail->link_chain) | |
112 | inode->i_nlink = 2; | |
113 | /* Maybe it should be controlled by mount parameter? */ | |
114 | //inode->i_mode |= S_ISVTX; | |
115 | inode->i_op = &affs_dir_inode_operations; | |
116 | inode->i_fop = &affs_dir_operations; | |
117 | break; | |
118 | case ST_LINKDIR: | |
119 | #if 0 | |
120 | affs_warning(sb, "read_inode", "inode is LINKDIR"); | |
121 | goto bad_inode; | |
122 | #else | |
123 | inode->i_mode |= S_IFDIR; | |
124 | inode->i_op = NULL; | |
125 | inode->i_fop = NULL; | |
126 | break; | |
127 | #endif | |
128 | case ST_LINKFILE: | |
129 | affs_warning(sb, "read_inode", "inode is LINKFILE"); | |
130 | goto bad_inode; | |
131 | case ST_FILE: | |
132 | size = be32_to_cpu(tail->size); | |
133 | inode->i_mode |= S_IFREG; | |
134 | AFFS_I(inode)->mmu_private = inode->i_size = size; | |
135 | if (inode->i_size) { | |
136 | AFFS_I(inode)->i_blkcnt = (size - 1) / | |
137 | sbi->s_data_blksize + 1; | |
138 | AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / | |
139 | sbi->s_hashsize + 1; | |
140 | } | |
141 | if (tail->link_chain) | |
142 | inode->i_nlink = 2; | |
143 | inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; | |
144 | inode->i_op = &affs_file_inode_operations; | |
145 | inode->i_fop = &affs_file_operations; | |
146 | break; | |
147 | case ST_SOFTLINK: | |
148 | inode->i_mode |= S_IFLNK; | |
149 | inode->i_op = &affs_symlink_inode_operations; | |
150 | inode->i_data.a_ops = &affs_symlink_aops; | |
151 | break; | |
152 | } | |
153 | ||
154 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec | |
155 | = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + | |
156 | be32_to_cpu(tail->change.mins) * 60 + | |
157 | be32_to_cpu(tail->change.ticks) / 50 + | |
158 | ((8 * 365 + 2) * 24 * 60 * 60)) + | |
159 | sys_tz.tz_minuteswest * 60; | |
160 | inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; | |
161 | affs_brelse(bh); | |
210f8559 DH |
162 | unlock_new_inode(inode); |
163 | return inode; | |
1da177e4 LT |
164 | |
165 | bad_inode: | |
1da177e4 | 166 | affs_brelse(bh); |
210f8559 DH |
167 | iget_failed(inode); |
168 | return ERR_PTR(-EIO); | |
1da177e4 LT |
169 | } |
170 | ||
171 | int | |
172 | affs_write_inode(struct inode *inode, int unused) | |
173 | { | |
174 | struct super_block *sb = inode->i_sb; | |
175 | struct buffer_head *bh; | |
176 | struct affs_tail *tail; | |
177 | uid_t uid; | |
178 | gid_t gid; | |
179 | ||
180 | pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino); | |
181 | ||
182 | if (!inode->i_nlink) | |
183 | // possibly free block | |
184 | return 0; | |
185 | bh = affs_bread(sb, inode->i_ino); | |
186 | if (!bh) { | |
187 | affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); | |
188 | return -EIO; | |
189 | } | |
190 | tail = AFFS_TAIL(sb, bh); | |
191 | if (tail->stype == cpu_to_be32(ST_ROOT)) { | |
192 | secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change); | |
193 | } else { | |
194 | tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); | |
195 | tail->size = cpu_to_be32(inode->i_size); | |
196 | secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change); | |
197 | if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { | |
198 | uid = inode->i_uid; | |
199 | gid = inode->i_gid; | |
200 | if (AFFS_SB(sb)->s_flags & SF_MUFS) { | |
201 | if (inode->i_uid == 0 || inode->i_uid == 0xFFFF) | |
202 | uid = inode->i_uid ^ ~0; | |
203 | if (inode->i_gid == 0 || inode->i_gid == 0xFFFF) | |
204 | gid = inode->i_gid ^ ~0; | |
205 | } | |
206 | if (!(AFFS_SB(sb)->s_flags & SF_SETUID)) | |
207 | tail->uid = cpu_to_be16(uid); | |
208 | if (!(AFFS_SB(sb)->s_flags & SF_SETGID)) | |
209 | tail->gid = cpu_to_be16(gid); | |
210 | } | |
211 | } | |
212 | affs_fix_checksum(sb, bh); | |
213 | mark_buffer_dirty_inode(bh, inode); | |
214 | affs_brelse(bh); | |
215 | affs_free_prealloc(inode); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | int | |
220 | affs_notify_change(struct dentry *dentry, struct iattr *attr) | |
221 | { | |
222 | struct inode *inode = dentry->d_inode; | |
223 | int error; | |
224 | ||
225 | pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid); | |
226 | ||
227 | error = inode_change_ok(inode,attr); | |
228 | if (error) | |
229 | goto out; | |
230 | ||
231 | if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) || | |
232 | ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) || | |
233 | ((attr->ia_valid & ATTR_MODE) && | |
234 | (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) { | |
235 | if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET)) | |
236 | error = -EPERM; | |
237 | goto out; | |
238 | } | |
239 | ||
240 | error = inode_setattr(inode, attr); | |
241 | if (!error && (attr->ia_valid & ATTR_MODE)) | |
242 | mode_to_prot(inode); | |
243 | out: | |
244 | return error; | |
245 | } | |
246 | ||
247 | void | |
248 | affs_put_inode(struct inode *inode) | |
249 | { | |
250 | pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); | |
251 | affs_free_prealloc(inode); | |
2be3c790 CH |
252 | } |
253 | ||
254 | void | |
255 | affs_drop_inode(struct inode *inode) | |
256 | { | |
257 | mutex_lock(&inode->i_mutex); | |
258 | if (inode->i_size != AFFS_I(inode)->mmu_private) | |
259 | affs_truncate(inode); | |
260 | mutex_unlock(&inode->i_mutex); | |
261 | ||
262 | generic_drop_inode(inode); | |
1da177e4 LT |
263 | } |
264 | ||
265 | void | |
266 | affs_delete_inode(struct inode *inode) | |
267 | { | |
268 | pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); | |
fef26658 | 269 | truncate_inode_pages(&inode->i_data, 0); |
1da177e4 LT |
270 | inode->i_size = 0; |
271 | if (S_ISREG(inode->i_mode)) | |
272 | affs_truncate(inode); | |
273 | clear_inode(inode); | |
274 | affs_free_block(inode->i_sb, inode->i_ino); | |
275 | } | |
276 | ||
277 | void | |
278 | affs_clear_inode(struct inode *inode) | |
279 | { | |
280 | unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc; | |
281 | ||
282 | pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); | |
283 | if (cache_page) { | |
284 | pr_debug("AFFS: freeing ext cache\n"); | |
285 | AFFS_I(inode)->i_lc = NULL; | |
286 | AFFS_I(inode)->i_ac = NULL; | |
287 | free_page(cache_page); | |
288 | } | |
289 | affs_brelse(AFFS_I(inode)->i_ext_bh); | |
290 | AFFS_I(inode)->i_ext_last = ~1; | |
291 | AFFS_I(inode)->i_ext_bh = NULL; | |
292 | } | |
293 | ||
294 | struct inode * | |
295 | affs_new_inode(struct inode *dir) | |
296 | { | |
297 | struct super_block *sb = dir->i_sb; | |
298 | struct inode *inode; | |
299 | u32 block; | |
300 | struct buffer_head *bh; | |
301 | ||
302 | if (!(inode = new_inode(sb))) | |
303 | goto err_inode; | |
304 | ||
305 | if (!(block = affs_alloc_block(dir, dir->i_ino))) | |
306 | goto err_block; | |
307 | ||
308 | bh = affs_getzeroblk(sb, block); | |
309 | if (!bh) | |
310 | goto err_bh; | |
311 | mark_buffer_dirty_inode(bh, inode); | |
312 | affs_brelse(bh); | |
313 | ||
314 | inode->i_uid = current->fsuid; | |
315 | inode->i_gid = current->fsgid; | |
316 | inode->i_ino = block; | |
317 | inode->i_nlink = 1; | |
318 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
319 | AFFS_I(inode)->i_opencnt = 0; | |
320 | AFFS_I(inode)->i_blkcnt = 0; | |
321 | AFFS_I(inode)->i_lc = NULL; | |
322 | AFFS_I(inode)->i_lc_size = 0; | |
323 | AFFS_I(inode)->i_lc_shift = 0; | |
324 | AFFS_I(inode)->i_lc_mask = 0; | |
325 | AFFS_I(inode)->i_ac = NULL; | |
326 | AFFS_I(inode)->i_ext_bh = NULL; | |
327 | AFFS_I(inode)->mmu_private = 0; | |
328 | AFFS_I(inode)->i_protect = 0; | |
329 | AFFS_I(inode)->i_lastalloc = 0; | |
330 | AFFS_I(inode)->i_pa_cnt = 0; | |
331 | AFFS_I(inode)->i_extcnt = 1; | |
332 | AFFS_I(inode)->i_ext_last = ~1; | |
333 | ||
334 | insert_inode_hash(inode); | |
335 | ||
336 | return inode; | |
337 | ||
338 | err_bh: | |
339 | affs_free_block(sb, block); | |
340 | err_block: | |
341 | iput(inode); | |
342 | err_inode: | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Add an entry to a directory. Create the header block | |
348 | * and insert it into the hash table. | |
349 | */ | |
350 | ||
351 | int | |
352 | affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) | |
353 | { | |
354 | struct super_block *sb = dir->i_sb; | |
355 | struct buffer_head *inode_bh = NULL; | |
356 | struct buffer_head *bh = NULL; | |
357 | u32 block = 0; | |
358 | int retval; | |
359 | ||
360 | pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino, | |
361 | (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type); | |
362 | ||
363 | retval = -EIO; | |
364 | bh = affs_bread(sb, inode->i_ino); | |
365 | if (!bh) | |
366 | goto done; | |
367 | ||
368 | affs_lock_link(inode); | |
369 | switch (type) { | |
370 | case ST_LINKFILE: | |
371 | case ST_LINKDIR: | |
372 | inode_bh = bh; | |
373 | retval = -ENOSPC; | |
374 | block = affs_alloc_block(dir, dir->i_ino); | |
375 | if (!block) | |
376 | goto err; | |
377 | retval = -EIO; | |
378 | bh = affs_getzeroblk(sb, block); | |
379 | if (!bh) | |
380 | goto err; | |
381 | break; | |
382 | default: | |
383 | break; | |
384 | } | |
385 | ||
386 | AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); | |
387 | AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); | |
388 | affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); | |
389 | AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); | |
390 | AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); | |
391 | ||
392 | if (inode_bh) { | |
393 | __be32 chain; | |
394 | chain = AFFS_TAIL(sb, inode_bh)->link_chain; | |
395 | AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); | |
396 | AFFS_TAIL(sb, bh)->link_chain = chain; | |
397 | AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); | |
398 | affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); | |
399 | mark_buffer_dirty_inode(inode_bh, inode); | |
400 | inode->i_nlink = 2; | |
401 | atomic_inc(&inode->i_count); | |
402 | } | |
403 | affs_fix_checksum(sb, bh); | |
404 | mark_buffer_dirty_inode(bh, inode); | |
405 | dentry->d_fsdata = (void *)(long)bh->b_blocknr; | |
406 | ||
407 | affs_lock_dir(dir); | |
408 | retval = affs_insert_hash(dir, bh); | |
409 | mark_buffer_dirty_inode(bh, inode); | |
410 | affs_unlock_dir(dir); | |
411 | affs_unlock_link(inode); | |
412 | ||
413 | d_instantiate(dentry, inode); | |
414 | done: | |
415 | affs_brelse(inode_bh); | |
416 | affs_brelse(bh); | |
417 | return retval; | |
418 | err: | |
419 | if (block) | |
420 | affs_free_block(sb, block); | |
421 | affs_unlock_link(inode); | |
422 | goto done; | |
423 | } |