27fe6cbe43ae84bc1582f8e86131cebb1566eb1e
[linux-2.6.git] / fs / affs / inode.c
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  */
12 #include <linux/sched.h>
13 #include "affs.h"
14
15 extern const struct inode_operations affs_symlink_inode_operations;
16 extern struct timezone sys_tz;
17
18 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
19 {
20         struct affs_sb_info     *sbi = AFFS_SB(sb);
21         struct buffer_head      *bh;
22         struct affs_head        *head;
23         struct affs_tail        *tail;
24         struct inode            *inode;
25         u32                      block;
26         u32                      size;
27         u32                      prot;
28         u16                      id;
29
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);
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);
162         unlock_new_inode(inode);
163         return inode;
164
165 bad_inode:
166         affs_brelse(bh);
167         iget_failed(inode);
168         return ERR_PTR(-EIO);
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);
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);
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);
269         truncate_inode_pages(&inode->i_data, 0);
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 }