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; | |
dca3c336 | 61 | atomic_set(&AFFS_I(inode)->i_opencnt, 0); |
1da177e4 LT |
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; | |
1da177e4 LT |
111 | /* Maybe it should be controlled by mount parameter? */ |
112 | //inode->i_mode |= S_ISVTX; | |
113 | inode->i_op = &affs_dir_inode_operations; | |
114 | inode->i_fop = &affs_dir_operations; | |
115 | break; | |
116 | case ST_LINKDIR: | |
117 | #if 0 | |
118 | affs_warning(sb, "read_inode", "inode is LINKDIR"); | |
119 | goto bad_inode; | |
120 | #else | |
121 | inode->i_mode |= S_IFDIR; | |
c765d479 | 122 | /* ... and leave ->i_op and ->i_fop pointing to empty */ |
1da177e4 LT |
123 | break; |
124 | #endif | |
125 | case ST_LINKFILE: | |
126 | affs_warning(sb, "read_inode", "inode is LINKFILE"); | |
127 | goto bad_inode; | |
128 | case ST_FILE: | |
129 | size = be32_to_cpu(tail->size); | |
130 | inode->i_mode |= S_IFREG; | |
131 | AFFS_I(inode)->mmu_private = inode->i_size = size; | |
132 | if (inode->i_size) { | |
133 | AFFS_I(inode)->i_blkcnt = (size - 1) / | |
134 | sbi->s_data_blksize + 1; | |
135 | AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / | |
136 | sbi->s_hashsize + 1; | |
137 | } | |
138 | if (tail->link_chain) | |
139 | inode->i_nlink = 2; | |
140 | inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; | |
141 | inode->i_op = &affs_file_inode_operations; | |
142 | inode->i_fop = &affs_file_operations; | |
143 | break; | |
144 | case ST_SOFTLINK: | |
145 | inode->i_mode |= S_IFLNK; | |
146 | inode->i_op = &affs_symlink_inode_operations; | |
147 | inode->i_data.a_ops = &affs_symlink_aops; | |
148 | break; | |
149 | } | |
150 | ||
151 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec | |
152 | = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + | |
153 | be32_to_cpu(tail->change.mins) * 60 + | |
154 | be32_to_cpu(tail->change.ticks) / 50 + | |
155 | ((8 * 365 + 2) * 24 * 60 * 60)) + | |
156 | sys_tz.tz_minuteswest * 60; | |
157 | inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; | |
158 | affs_brelse(bh); | |
210f8559 DH |
159 | unlock_new_inode(inode); |
160 | return inode; | |
1da177e4 LT |
161 | |
162 | bad_inode: | |
1da177e4 | 163 | affs_brelse(bh); |
210f8559 DH |
164 | iget_failed(inode); |
165 | return ERR_PTR(-EIO); | |
1da177e4 LT |
166 | } |
167 | ||
168 | int | |
169 | affs_write_inode(struct inode *inode, int unused) | |
170 | { | |
171 | struct super_block *sb = inode->i_sb; | |
172 | struct buffer_head *bh; | |
173 | struct affs_tail *tail; | |
174 | uid_t uid; | |
175 | gid_t gid; | |
176 | ||
177 | pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino); | |
178 | ||
179 | if (!inode->i_nlink) | |
180 | // possibly free block | |
181 | return 0; | |
182 | bh = affs_bread(sb, inode->i_ino); | |
183 | if (!bh) { | |
184 | affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); | |
185 | return -EIO; | |
186 | } | |
187 | tail = AFFS_TAIL(sb, bh); | |
188 | if (tail->stype == cpu_to_be32(ST_ROOT)) { | |
189 | secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change); | |
190 | } else { | |
191 | tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); | |
192 | tail->size = cpu_to_be32(inode->i_size); | |
193 | secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change); | |
194 | if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { | |
195 | uid = inode->i_uid; | |
196 | gid = inode->i_gid; | |
197 | if (AFFS_SB(sb)->s_flags & SF_MUFS) { | |
198 | if (inode->i_uid == 0 || inode->i_uid == 0xFFFF) | |
199 | uid = inode->i_uid ^ ~0; | |
200 | if (inode->i_gid == 0 || inode->i_gid == 0xFFFF) | |
201 | gid = inode->i_gid ^ ~0; | |
202 | } | |
203 | if (!(AFFS_SB(sb)->s_flags & SF_SETUID)) | |
204 | tail->uid = cpu_to_be16(uid); | |
205 | if (!(AFFS_SB(sb)->s_flags & SF_SETGID)) | |
206 | tail->gid = cpu_to_be16(gid); | |
207 | } | |
208 | } | |
209 | affs_fix_checksum(sb, bh); | |
210 | mark_buffer_dirty_inode(bh, inode); | |
211 | affs_brelse(bh); | |
212 | affs_free_prealloc(inode); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | int | |
217 | affs_notify_change(struct dentry *dentry, struct iattr *attr) | |
218 | { | |
219 | struct inode *inode = dentry->d_inode; | |
220 | int error; | |
221 | ||
222 | pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid); | |
223 | ||
224 | error = inode_change_ok(inode,attr); | |
225 | if (error) | |
226 | goto out; | |
227 | ||
228 | if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) || | |
229 | ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) || | |
230 | ((attr->ia_valid & ATTR_MODE) && | |
231 | (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) { | |
232 | if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET)) | |
233 | error = -EPERM; | |
234 | goto out; | |
235 | } | |
236 | ||
237 | error = inode_setattr(inode, attr); | |
238 | if (!error && (attr->ia_valid & ATTR_MODE)) | |
239 | mode_to_prot(inode); | |
240 | out: | |
241 | return error; | |
242 | } | |
243 | ||
1da177e4 LT |
244 | void |
245 | affs_delete_inode(struct inode *inode) | |
246 | { | |
247 | pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); | |
fef26658 | 248 | truncate_inode_pages(&inode->i_data, 0); |
1da177e4 | 249 | inode->i_size = 0; |
dca3c336 | 250 | affs_truncate(inode); |
1da177e4 LT |
251 | clear_inode(inode); |
252 | affs_free_block(inode->i_sb, inode->i_ino); | |
253 | } | |
254 | ||
255 | void | |
256 | affs_clear_inode(struct inode *inode) | |
257 | { | |
dca3c336 | 258 | unsigned long cache_page; |
1da177e4 LT |
259 | |
260 | pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); | |
dca3c336 RZ |
261 | |
262 | affs_free_prealloc(inode); | |
263 | cache_page = (unsigned long)AFFS_I(inode)->i_lc; | |
1da177e4 LT |
264 | if (cache_page) { |
265 | pr_debug("AFFS: freeing ext cache\n"); | |
266 | AFFS_I(inode)->i_lc = NULL; | |
267 | AFFS_I(inode)->i_ac = NULL; | |
268 | free_page(cache_page); | |
269 | } | |
270 | affs_brelse(AFFS_I(inode)->i_ext_bh); | |
271 | AFFS_I(inode)->i_ext_last = ~1; | |
272 | AFFS_I(inode)->i_ext_bh = NULL; | |
273 | } | |
274 | ||
275 | struct inode * | |
276 | affs_new_inode(struct inode *dir) | |
277 | { | |
278 | struct super_block *sb = dir->i_sb; | |
279 | struct inode *inode; | |
280 | u32 block; | |
281 | struct buffer_head *bh; | |
282 | ||
283 | if (!(inode = new_inode(sb))) | |
284 | goto err_inode; | |
285 | ||
286 | if (!(block = affs_alloc_block(dir, dir->i_ino))) | |
287 | goto err_block; | |
288 | ||
289 | bh = affs_getzeroblk(sb, block); | |
290 | if (!bh) | |
291 | goto err_bh; | |
292 | mark_buffer_dirty_inode(bh, inode); | |
293 | affs_brelse(bh); | |
294 | ||
21559981 DH |
295 | inode->i_uid = current_fsuid(); |
296 | inode->i_gid = current_fsgid(); | |
1da177e4 LT |
297 | inode->i_ino = block; |
298 | inode->i_nlink = 1; | |
299 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
dca3c336 | 300 | atomic_set(&AFFS_I(inode)->i_opencnt, 0); |
1da177e4 LT |
301 | AFFS_I(inode)->i_blkcnt = 0; |
302 | AFFS_I(inode)->i_lc = NULL; | |
303 | AFFS_I(inode)->i_lc_size = 0; | |
304 | AFFS_I(inode)->i_lc_shift = 0; | |
305 | AFFS_I(inode)->i_lc_mask = 0; | |
306 | AFFS_I(inode)->i_ac = NULL; | |
307 | AFFS_I(inode)->i_ext_bh = NULL; | |
308 | AFFS_I(inode)->mmu_private = 0; | |
309 | AFFS_I(inode)->i_protect = 0; | |
310 | AFFS_I(inode)->i_lastalloc = 0; | |
311 | AFFS_I(inode)->i_pa_cnt = 0; | |
312 | AFFS_I(inode)->i_extcnt = 1; | |
313 | AFFS_I(inode)->i_ext_last = ~1; | |
314 | ||
315 | insert_inode_hash(inode); | |
316 | ||
317 | return inode; | |
318 | ||
319 | err_bh: | |
320 | affs_free_block(sb, block); | |
321 | err_block: | |
322 | iput(inode); | |
323 | err_inode: | |
324 | return NULL; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Add an entry to a directory. Create the header block | |
329 | * and insert it into the hash table. | |
330 | */ | |
331 | ||
332 | int | |
333 | affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) | |
334 | { | |
335 | struct super_block *sb = dir->i_sb; | |
336 | struct buffer_head *inode_bh = NULL; | |
337 | struct buffer_head *bh = NULL; | |
338 | u32 block = 0; | |
339 | int retval; | |
340 | ||
341 | pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino, | |
342 | (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type); | |
343 | ||
344 | retval = -EIO; | |
345 | bh = affs_bread(sb, inode->i_ino); | |
346 | if (!bh) | |
347 | goto done; | |
348 | ||
349 | affs_lock_link(inode); | |
350 | switch (type) { | |
351 | case ST_LINKFILE: | |
352 | case ST_LINKDIR: | |
1da177e4 LT |
353 | retval = -ENOSPC; |
354 | block = affs_alloc_block(dir, dir->i_ino); | |
355 | if (!block) | |
356 | goto err; | |
357 | retval = -EIO; | |
dca3c336 | 358 | inode_bh = bh; |
1da177e4 LT |
359 | bh = affs_getzeroblk(sb, block); |
360 | if (!bh) | |
361 | goto err; | |
362 | break; | |
363 | default: | |
364 | break; | |
365 | } | |
366 | ||
367 | AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); | |
368 | AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); | |
369 | affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); | |
370 | AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); | |
371 | AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); | |
372 | ||
373 | if (inode_bh) { | |
374 | __be32 chain; | |
375 | chain = AFFS_TAIL(sb, inode_bh)->link_chain; | |
376 | AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); | |
377 | AFFS_TAIL(sb, bh)->link_chain = chain; | |
378 | AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); | |
379 | affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); | |
380 | mark_buffer_dirty_inode(inode_bh, inode); | |
381 | inode->i_nlink = 2; | |
382 | atomic_inc(&inode->i_count); | |
383 | } | |
384 | affs_fix_checksum(sb, bh); | |
385 | mark_buffer_dirty_inode(bh, inode); | |
386 | dentry->d_fsdata = (void *)(long)bh->b_blocknr; | |
387 | ||
388 | affs_lock_dir(dir); | |
389 | retval = affs_insert_hash(dir, bh); | |
390 | mark_buffer_dirty_inode(bh, inode); | |
391 | affs_unlock_dir(dir); | |
392 | affs_unlock_link(inode); | |
393 | ||
394 | d_instantiate(dentry, inode); | |
395 | done: | |
396 | affs_brelse(inode_bh); | |
397 | affs_brelse(bh); | |
398 | return retval; | |
399 | err: | |
400 | if (block) | |
401 | affs_free_block(sb, block); | |
402 | affs_unlock_link(inode); | |
403 | goto done; | |
404 | } |