fs/affs: return f_fsid for statfs(2)
[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         atomic_set(&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                 /* 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;
122                 /* ... and leave ->i_op and ->i_fop pointing to empty */
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);
159         unlock_new_inode(inode);
160         return inode;
161
162 bad_inode:
163         affs_brelse(bh);
164         iget_failed(inode);
165         return ERR_PTR(-EIO);
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
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);
248         truncate_inode_pages(&inode->i_data, 0);
249         inode->i_size = 0;
250         affs_truncate(inode);
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 {
258         unsigned long cache_page;
259
260         pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
261
262         affs_free_prealloc(inode);
263         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
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
295         inode->i_uid     = current_fsuid();
296         inode->i_gid     = current_fsgid();
297         inode->i_ino     = block;
298         inode->i_nlink   = 1;
299         inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
300         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
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:
353                 retval = -ENOSPC;
354                 block = affs_alloc_block(dir, dir->i_ino);
355                 if (!block)
356                         goto err;
357                 retval = -EIO;
358                 inode_bh = bh;
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 }