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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> |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
1da177e4 LT |
14 | #include "affs.h" |
15 | ||
754661f1 | 16 | extern const struct inode_operations affs_symlink_inode_operations; |
1da177e4 LT |
17 | extern struct timezone sys_tz; |
18 | ||
210f8559 | 19 | struct inode *affs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 20 | { |
1da177e4 LT |
21 | struct affs_sb_info *sbi = AFFS_SB(sb); |
22 | struct buffer_head *bh; | |
23 | struct affs_head *head; | |
24 | struct affs_tail *tail; | |
210f8559 | 25 | struct inode *inode; |
1da177e4 LT |
26 | u32 block; |
27 | u32 size; | |
28 | u32 prot; | |
29 | u16 id; | |
30 | ||
210f8559 DH |
31 | inode = iget_locked(sb, ino); |
32 | if (!inode) | |
33 | return ERR_PTR(-ENOMEM); | |
34 | if (!(inode->i_state & I_NEW)) | |
35 | return inode; | |
36 | ||
9606d9aa | 37 | pr_debug("affs_iget(%lu)\n", inode->i_ino); |
1da177e4 LT |
38 | |
39 | block = inode->i_ino; | |
40 | bh = affs_bread(sb, block); | |
41 | if (!bh) { | |
42 | affs_warning(sb, "read_inode", "Cannot read block %d", block); | |
43 | goto bad_inode; | |
44 | } | |
45 | if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { | |
46 | affs_warning(sb,"read_inode", | |
47 | "Checksum or type (ptype=%d) error on inode %d", | |
48 | AFFS_HEAD(bh)->ptype, block); | |
49 | goto bad_inode; | |
50 | } | |
51 | ||
52 | head = AFFS_HEAD(bh); | |
53 | tail = AFFS_TAIL(sb, bh); | |
54 | prot = be32_to_cpu(tail->protect); | |
55 | ||
56 | inode->i_size = 0; | |
bfe86848 | 57 | set_nlink(inode, 1); |
1da177e4 LT |
58 | inode->i_mode = 0; |
59 | AFFS_I(inode)->i_extcnt = 1; | |
60 | AFFS_I(inode)->i_ext_last = ~1; | |
61 | AFFS_I(inode)->i_protect = prot; | |
dca3c336 | 62 | atomic_set(&AFFS_I(inode)->i_opencnt, 0); |
1da177e4 LT |
63 | AFFS_I(inode)->i_blkcnt = 0; |
64 | AFFS_I(inode)->i_lc = NULL; | |
65 | AFFS_I(inode)->i_lc_size = 0; | |
66 | AFFS_I(inode)->i_lc_shift = 0; | |
67 | AFFS_I(inode)->i_lc_mask = 0; | |
68 | AFFS_I(inode)->i_ac = NULL; | |
69 | AFFS_I(inode)->i_ext_bh = NULL; | |
70 | AFFS_I(inode)->mmu_private = 0; | |
71 | AFFS_I(inode)->i_lastalloc = 0; | |
72 | AFFS_I(inode)->i_pa_cnt = 0; | |
73 | ||
74 | if (sbi->s_flags & SF_SETMODE) | |
75 | inode->i_mode = sbi->s_mode; | |
76 | else | |
77 | inode->i_mode = prot_to_mode(prot); | |
78 | ||
79 | id = be16_to_cpu(tail->uid); | |
80 | if (id == 0 || sbi->s_flags & SF_SETUID) | |
81 | inode->i_uid = sbi->s_uid; | |
82 | else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) | |
8fed10be | 83 | i_uid_write(inode, 0); |
1da177e4 | 84 | else |
8fed10be | 85 | i_uid_write(inode, id); |
1da177e4 LT |
86 | |
87 | id = be16_to_cpu(tail->gid); | |
88 | if (id == 0 || sbi->s_flags & SF_SETGID) | |
89 | inode->i_gid = sbi->s_gid; | |
90 | else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) | |
8fed10be | 91 | i_gid_write(inode, 0); |
1da177e4 | 92 | else |
8fed10be | 93 | i_gid_write(inode, id); |
1da177e4 LT |
94 | |
95 | switch (be32_to_cpu(tail->stype)) { | |
96 | case ST_ROOT: | |
97 | inode->i_uid = sbi->s_uid; | |
98 | inode->i_gid = sbi->s_gid; | |
99 | /* fall through */ | |
100 | case ST_USERDIR: | |
101 | if (be32_to_cpu(tail->stype) == ST_USERDIR || | |
102 | sbi->s_flags & SF_SETMODE) { | |
103 | if (inode->i_mode & S_IRUSR) | |
104 | inode->i_mode |= S_IXUSR; | |
105 | if (inode->i_mode & S_IRGRP) | |
106 | inode->i_mode |= S_IXGRP; | |
107 | if (inode->i_mode & S_IROTH) | |
108 | inode->i_mode |= S_IXOTH; | |
109 | inode->i_mode |= S_IFDIR; | |
110 | } else | |
111 | inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; | |
1da177e4 LT |
112 | /* Maybe it should be controlled by mount parameter? */ |
113 | //inode->i_mode |= S_ISVTX; | |
114 | inode->i_op = &affs_dir_inode_operations; | |
115 | inode->i_fop = &affs_dir_operations; | |
116 | break; | |
117 | case ST_LINKDIR: | |
118 | #if 0 | |
119 | affs_warning(sb, "read_inode", "inode is LINKDIR"); | |
120 | goto bad_inode; | |
121 | #else | |
122 | inode->i_mode |= S_IFDIR; | |
c765d479 | 123 | /* ... and leave ->i_op and ->i_fop pointing to empty */ |
1da177e4 LT |
124 | break; |
125 | #endif | |
126 | case ST_LINKFILE: | |
127 | affs_warning(sb, "read_inode", "inode is LINKFILE"); | |
128 | goto bad_inode; | |
129 | case ST_FILE: | |
130 | size = be32_to_cpu(tail->size); | |
131 | inode->i_mode |= S_IFREG; | |
132 | AFFS_I(inode)->mmu_private = inode->i_size = size; | |
133 | if (inode->i_size) { | |
134 | AFFS_I(inode)->i_blkcnt = (size - 1) / | |
135 | sbi->s_data_blksize + 1; | |
136 | AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / | |
137 | sbi->s_hashsize + 1; | |
138 | } | |
139 | if (tail->link_chain) | |
bfe86848 | 140 | set_nlink(inode, 2); |
1da177e4 LT |
141 | inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; |
142 | inode->i_op = &affs_file_inode_operations; | |
143 | inode->i_fop = &affs_file_operations; | |
144 | break; | |
145 | case ST_SOFTLINK: | |
146 | inode->i_mode |= S_IFLNK; | |
147 | inode->i_op = &affs_symlink_inode_operations; | |
148 | inode->i_data.a_ops = &affs_symlink_aops; | |
149 | break; | |
150 | } | |
151 | ||
152 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec | |
153 | = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + | |
154 | be32_to_cpu(tail->change.mins) * 60 + | |
155 | be32_to_cpu(tail->change.ticks) / 50 + | |
156 | ((8 * 365 + 2) * 24 * 60 * 60)) + | |
157 | sys_tz.tz_minuteswest * 60; | |
158 | inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; | |
159 | affs_brelse(bh); | |
210f8559 DH |
160 | unlock_new_inode(inode); |
161 | return inode; | |
1da177e4 LT |
162 | |
163 | bad_inode: | |
1da177e4 | 164 | affs_brelse(bh); |
210f8559 DH |
165 | iget_failed(inode); |
166 | return ERR_PTR(-EIO); | |
1da177e4 LT |
167 | } |
168 | ||
169 | int | |
a9185b41 | 170 | affs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 LT |
171 | { |
172 | struct super_block *sb = inode->i_sb; | |
173 | struct buffer_head *bh; | |
174 | struct affs_tail *tail; | |
175 | uid_t uid; | |
176 | gid_t gid; | |
177 | ||
9606d9aa | 178 | pr_debug("write_inode(%lu)\n", inode->i_ino); |
1da177e4 LT |
179 | |
180 | if (!inode->i_nlink) | |
181 | // possibly free block | |
182 | return 0; | |
183 | bh = affs_bread(sb, inode->i_ino); | |
184 | if (!bh) { | |
185 | affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); | |
186 | return -EIO; | |
187 | } | |
188 | tail = AFFS_TAIL(sb, bh); | |
189 | if (tail->stype == cpu_to_be32(ST_ROOT)) { | |
190 | secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change); | |
191 | } else { | |
192 | tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); | |
193 | tail->size = cpu_to_be32(inode->i_size); | |
194 | secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change); | |
195 | if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { | |
8fed10be EB |
196 | uid = i_uid_read(inode); |
197 | gid = i_gid_read(inode); | |
1da177e4 | 198 | if (AFFS_SB(sb)->s_flags & SF_MUFS) { |
8fed10be EB |
199 | if (uid == 0 || uid == 0xFFFF) |
200 | uid = uid ^ ~0; | |
201 | if (gid == 0 || gid == 0xFFFF) | |
202 | gid = gid ^ ~0; | |
1da177e4 LT |
203 | } |
204 | if (!(AFFS_SB(sb)->s_flags & SF_SETUID)) | |
205 | tail->uid = cpu_to_be16(uid); | |
206 | if (!(AFFS_SB(sb)->s_flags & SF_SETGID)) | |
207 | tail->gid = cpu_to_be16(gid); | |
208 | } | |
209 | } | |
210 | affs_fix_checksum(sb, bh); | |
211 | mark_buffer_dirty_inode(bh, inode); | |
212 | affs_brelse(bh); | |
213 | affs_free_prealloc(inode); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | int | |
218 | affs_notify_change(struct dentry *dentry, struct iattr *attr) | |
219 | { | |
220 | struct inode *inode = dentry->d_inode; | |
221 | int error; | |
222 | ||
9606d9aa | 223 | pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); |
1da177e4 LT |
224 | |
225 | error = inode_change_ok(inode,attr); | |
226 | if (error) | |
227 | goto out; | |
228 | ||
229 | if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) || | |
230 | ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) || | |
231 | ((attr->ia_valid & ATTR_MODE) && | |
232 | (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) { | |
233 | if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET)) | |
234 | error = -EPERM; | |
235 | goto out; | |
236 | } | |
237 | ||
1025774c CH |
238 | if ((attr->ia_valid & ATTR_SIZE) && |
239 | attr->ia_size != i_size_read(inode)) { | |
1dc1834f | 240 | error = inode_newsize_ok(inode, attr->ia_size); |
1025774c CH |
241 | if (error) |
242 | return error; | |
1dc1834f MS |
243 | |
244 | truncate_setsize(inode, attr->ia_size); | |
245 | affs_truncate(inode); | |
1025774c CH |
246 | } |
247 | ||
248 | setattr_copy(inode, attr); | |
249 | mark_inode_dirty(inode); | |
250 | ||
251 | if (attr->ia_valid & ATTR_MODE) | |
1da177e4 LT |
252 | mode_to_prot(inode); |
253 | out: | |
254 | return error; | |
255 | } | |
256 | ||
1da177e4 | 257 | void |
f053ddde | 258 | affs_evict_inode(struct inode *inode) |
1da177e4 | 259 | { |
dca3c336 | 260 | unsigned long cache_page; |
9606d9aa FF |
261 | pr_debug("evict_inode(ino=%lu, nlink=%u)\n", |
262 | inode->i_ino, inode->i_nlink); | |
91b0abe3 | 263 | truncate_inode_pages_final(&inode->i_data); |
1da177e4 | 264 | |
f053ddde AV |
265 | if (!inode->i_nlink) { |
266 | inode->i_size = 0; | |
267 | affs_truncate(inode); | |
268 | } | |
dca3c336 | 269 | |
f053ddde | 270 | invalidate_inode_buffers(inode); |
dbd5768f | 271 | clear_inode(inode); |
dca3c336 RZ |
272 | affs_free_prealloc(inode); |
273 | cache_page = (unsigned long)AFFS_I(inode)->i_lc; | |
1da177e4 | 274 | if (cache_page) { |
9606d9aa | 275 | pr_debug("freeing ext cache\n"); |
1da177e4 LT |
276 | AFFS_I(inode)->i_lc = NULL; |
277 | AFFS_I(inode)->i_ac = NULL; | |
278 | free_page(cache_page); | |
279 | } | |
280 | affs_brelse(AFFS_I(inode)->i_ext_bh); | |
281 | AFFS_I(inode)->i_ext_last = ~1; | |
282 | AFFS_I(inode)->i_ext_bh = NULL; | |
f053ddde AV |
283 | |
284 | if (!inode->i_nlink) | |
285 | affs_free_block(inode->i_sb, inode->i_ino); | |
1da177e4 LT |
286 | } |
287 | ||
288 | struct inode * | |
289 | affs_new_inode(struct inode *dir) | |
290 | { | |
291 | struct super_block *sb = dir->i_sb; | |
292 | struct inode *inode; | |
293 | u32 block; | |
294 | struct buffer_head *bh; | |
295 | ||
296 | if (!(inode = new_inode(sb))) | |
297 | goto err_inode; | |
298 | ||
299 | if (!(block = affs_alloc_block(dir, dir->i_ino))) | |
300 | goto err_block; | |
301 | ||
302 | bh = affs_getzeroblk(sb, block); | |
303 | if (!bh) | |
304 | goto err_bh; | |
305 | mark_buffer_dirty_inode(bh, inode); | |
306 | affs_brelse(bh); | |
307 | ||
21559981 DH |
308 | inode->i_uid = current_fsuid(); |
309 | inode->i_gid = current_fsgid(); | |
1da177e4 | 310 | inode->i_ino = block; |
bfe86848 | 311 | set_nlink(inode, 1); |
1da177e4 | 312 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; |
dca3c336 | 313 | atomic_set(&AFFS_I(inode)->i_opencnt, 0); |
1da177e4 LT |
314 | AFFS_I(inode)->i_blkcnt = 0; |
315 | AFFS_I(inode)->i_lc = NULL; | |
316 | AFFS_I(inode)->i_lc_size = 0; | |
317 | AFFS_I(inode)->i_lc_shift = 0; | |
318 | AFFS_I(inode)->i_lc_mask = 0; | |
319 | AFFS_I(inode)->i_ac = NULL; | |
320 | AFFS_I(inode)->i_ext_bh = NULL; | |
321 | AFFS_I(inode)->mmu_private = 0; | |
322 | AFFS_I(inode)->i_protect = 0; | |
323 | AFFS_I(inode)->i_lastalloc = 0; | |
324 | AFFS_I(inode)->i_pa_cnt = 0; | |
325 | AFFS_I(inode)->i_extcnt = 1; | |
326 | AFFS_I(inode)->i_ext_last = ~1; | |
327 | ||
328 | insert_inode_hash(inode); | |
329 | ||
330 | return inode; | |
331 | ||
332 | err_bh: | |
333 | affs_free_block(sb, block); | |
334 | err_block: | |
335 | iput(inode); | |
336 | err_inode: | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Add an entry to a directory. Create the header block | |
342 | * and insert it into the hash table. | |
343 | */ | |
344 | ||
345 | int | |
346 | affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) | |
347 | { | |
348 | struct super_block *sb = dir->i_sb; | |
349 | struct buffer_head *inode_bh = NULL; | |
350 | struct buffer_head *bh = NULL; | |
351 | u32 block = 0; | |
352 | int retval; | |
353 | ||
9606d9aa FF |
354 | pr_debug("%s(dir=%u, inode=%u, \"%*s\", type=%d)\n", |
355 | __func__, (u32)dir->i_ino, | |
1da177e4 LT |
356 | (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type); |
357 | ||
358 | retval = -EIO; | |
359 | bh = affs_bread(sb, inode->i_ino); | |
360 | if (!bh) | |
361 | goto done; | |
362 | ||
363 | affs_lock_link(inode); | |
364 | switch (type) { | |
365 | case ST_LINKFILE: | |
366 | case ST_LINKDIR: | |
1da177e4 LT |
367 | retval = -ENOSPC; |
368 | block = affs_alloc_block(dir, dir->i_ino); | |
369 | if (!block) | |
370 | goto err; | |
371 | retval = -EIO; | |
dca3c336 | 372 | inode_bh = bh; |
1da177e4 LT |
373 | bh = affs_getzeroblk(sb, block); |
374 | if (!bh) | |
375 | goto err; | |
376 | break; | |
377 | default: | |
378 | break; | |
379 | } | |
380 | ||
381 | AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); | |
382 | AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); | |
383 | affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); | |
384 | AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); | |
385 | AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); | |
386 | ||
387 | if (inode_bh) { | |
388 | __be32 chain; | |
389 | chain = AFFS_TAIL(sb, inode_bh)->link_chain; | |
390 | AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); | |
391 | AFFS_TAIL(sb, bh)->link_chain = chain; | |
392 | AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); | |
393 | affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); | |
394 | mark_buffer_dirty_inode(inode_bh, inode); | |
bfe86848 | 395 | set_nlink(inode, 2); |
7de9c6ee | 396 | ihold(inode); |
1da177e4 LT |
397 | } |
398 | affs_fix_checksum(sb, bh); | |
399 | mark_buffer_dirty_inode(bh, inode); | |
400 | dentry->d_fsdata = (void *)(long)bh->b_blocknr; | |
401 | ||
402 | affs_lock_dir(dir); | |
403 | retval = affs_insert_hash(dir, bh); | |
404 | mark_buffer_dirty_inode(bh, inode); | |
405 | affs_unlock_dir(dir); | |
406 | affs_unlock_link(inode); | |
407 | ||
408 | d_instantiate(dentry, inode); | |
409 | done: | |
410 | affs_brelse(inode_bh); | |
411 | affs_brelse(bh); | |
412 | return retval; | |
413 | err: | |
414 | if (block) | |
415 | affs_free_block(sb, block); | |
416 | affs_unlock_link(inode); | |
417 | goto done; | |
418 | } |