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