GNU Linux-libre 4.9.308-gnu1
[releases.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 <linux/gfp.h>
14 #include "affs.h"
15
16 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
17 {
18         struct affs_sb_info     *sbi = AFFS_SB(sb);
19         struct buffer_head      *bh;
20         struct affs_tail        *tail;
21         struct inode            *inode;
22         u32                      block;
23         u32                      size;
24         u32                      prot;
25         u16                      id;
26
27         inode = iget_locked(sb, ino);
28         if (!inode)
29                 return ERR_PTR(-ENOMEM);
30         if (!(inode->i_state & I_NEW))
31                 return inode;
32
33         pr_debug("affs_iget(%lu)\n", inode->i_ino);
34
35         block = inode->i_ino;
36         bh = affs_bread(sb, block);
37         if (!bh) {
38                 affs_warning(sb, "read_inode", "Cannot read block %d", block);
39                 goto bad_inode;
40         }
41         if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
42                 affs_warning(sb,"read_inode",
43                            "Checksum or type (ptype=%d) error on inode %d",
44                            AFFS_HEAD(bh)->ptype, block);
45                 goto bad_inode;
46         }
47
48         tail = AFFS_TAIL(sb, bh);
49         prot = be32_to_cpu(tail->protect);
50
51         inode->i_size = 0;
52         set_nlink(inode, 1);
53         inode->i_mode = 0;
54         AFFS_I(inode)->i_extcnt = 1;
55         AFFS_I(inode)->i_ext_last = ~1;
56         AFFS_I(inode)->i_protect = prot;
57         atomic_set(&AFFS_I(inode)->i_opencnt, 0);
58         AFFS_I(inode)->i_blkcnt = 0;
59         AFFS_I(inode)->i_lc = NULL;
60         AFFS_I(inode)->i_lc_size = 0;
61         AFFS_I(inode)->i_lc_shift = 0;
62         AFFS_I(inode)->i_lc_mask = 0;
63         AFFS_I(inode)->i_ac = NULL;
64         AFFS_I(inode)->i_ext_bh = NULL;
65         AFFS_I(inode)->mmu_private = 0;
66         AFFS_I(inode)->i_lastalloc = 0;
67         AFFS_I(inode)->i_pa_cnt = 0;
68
69         if (affs_test_opt(sbi->s_flags, SF_SETMODE))
70                 inode->i_mode = sbi->s_mode;
71         else
72                 inode->i_mode = prot_to_mode(prot);
73
74         id = be16_to_cpu(tail->uid);
75         if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))
76                 inode->i_uid = sbi->s_uid;
77         else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
78                 i_uid_write(inode, 0);
79         else
80                 i_uid_write(inode, id);
81
82         id = be16_to_cpu(tail->gid);
83         if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))
84                 inode->i_gid = sbi->s_gid;
85         else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
86                 i_gid_write(inode, 0);
87         else
88                 i_gid_write(inode, id);
89
90         switch (be32_to_cpu(tail->stype)) {
91         case ST_ROOT:
92                 inode->i_uid = sbi->s_uid;
93                 inode->i_gid = sbi->s_gid;
94                 /* fall through */
95         case ST_USERDIR:
96                 if (be32_to_cpu(tail->stype) == ST_USERDIR ||
97                     affs_test_opt(sbi->s_flags, SF_SETMODE)) {
98                         if (inode->i_mode & S_IRUSR)
99                                 inode->i_mode |= S_IXUSR;
100                         if (inode->i_mode & S_IRGRP)
101                                 inode->i_mode |= S_IXGRP;
102                         if (inode->i_mode & S_IROTH)
103                                 inode->i_mode |= S_IXOTH;
104                         inode->i_mode |= S_IFDIR;
105                 } else
106                         inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
107                 /* Maybe it should be controlled by mount parameter? */
108                 //inode->i_mode |= S_ISVTX;
109                 inode->i_op = &affs_dir_inode_operations;
110                 inode->i_fop = &affs_dir_operations;
111                 break;
112         case ST_LINKDIR:
113 #if 0
114                 affs_warning(sb, "read_inode", "inode is LINKDIR");
115                 goto bad_inode;
116 #else
117                 inode->i_mode |= S_IFDIR;
118                 /* ... and leave ->i_op and ->i_fop pointing to empty */
119                 break;
120 #endif
121         case ST_LINKFILE:
122                 affs_warning(sb, "read_inode", "inode is LINKFILE");
123                 goto bad_inode;
124         case ST_FILE:
125                 size = be32_to_cpu(tail->size);
126                 inode->i_mode |= S_IFREG;
127                 AFFS_I(inode)->mmu_private = inode->i_size = size;
128                 if (inode->i_size) {
129                         AFFS_I(inode)->i_blkcnt = (size - 1) /
130                                                sbi->s_data_blksize + 1;
131                         AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
132                                                sbi->s_hashsize + 1;
133                 }
134                 if (tail->link_chain)
135                         set_nlink(inode, 2);
136                 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?
137                                           &affs_aops_ofs : &affs_aops;
138                 inode->i_op = &affs_file_inode_operations;
139                 inode->i_fop = &affs_file_operations;
140                 break;
141         case ST_SOFTLINK:
142                 inode->i_mode |= S_IFLNK;
143                 inode_nohighmem(inode);
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         unlock_new_inode(inode);
158         return inode;
159
160 bad_inode:
161         affs_brelse(bh);
162         iget_failed(inode);
163         return ERR_PTR(-EIO);
164 }
165
166 int
167 affs_write_inode(struct inode *inode, struct writeback_control *wbc)
168 {
169         struct super_block      *sb = inode->i_sb;
170         struct buffer_head      *bh;
171         struct affs_tail        *tail;
172         uid_t                    uid;
173         gid_t                    gid;
174
175         pr_debug("write_inode(%lu)\n", inode->i_ino);
176
177         if (!inode->i_nlink)
178                 // possibly free block
179                 return 0;
180         bh = affs_bread(sb, inode->i_ino);
181         if (!bh) {
182                 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
183                 return -EIO;
184         }
185         tail = AFFS_TAIL(sb, bh);
186         if (tail->stype == cpu_to_be32(ST_ROOT)) {
187                 secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
188         } else {
189                 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
190                 tail->size = cpu_to_be32(inode->i_size);
191                 secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
192                 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
193                         uid = i_uid_read(inode);
194                         gid = i_gid_read(inode);
195                         if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
196                                 if (uid == 0 || uid == 0xFFFF)
197                                         uid = uid ^ ~0;
198                                 if (gid == 0 || gid == 0xFFFF)
199                                         gid = gid ^ ~0;
200                         }
201                         if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
202                                 tail->uid = cpu_to_be16(uid);
203                         if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))
204                                 tail->gid = cpu_to_be16(gid);
205                 }
206         }
207         affs_fix_checksum(sb, bh);
208         mark_buffer_dirty_inode(bh, inode);
209         affs_brelse(bh);
210         affs_free_prealloc(inode);
211         return 0;
212 }
213
214 int
215 affs_notify_change(struct dentry *dentry, struct iattr *attr)
216 {
217         struct inode *inode = d_inode(dentry);
218         int error;
219
220         pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
221
222         error = setattr_prepare(dentry, attr);
223         if (error)
224                 goto out;
225
226         if (((attr->ia_valid & ATTR_UID) &&
227               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||
228             ((attr->ia_valid & ATTR_GID) &&
229               affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||
230             ((attr->ia_valid & ATTR_MODE) &&
231              (AFFS_SB(inode->i_sb)->s_flags &
232               (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
233                 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
234                         error = -EPERM;
235                 goto out;
236         }
237
238         if ((attr->ia_valid & ATTR_SIZE) &&
239             attr->ia_size != i_size_read(inode)) {
240                 error = inode_newsize_ok(inode, attr->ia_size);
241                 if (error)
242                         return error;
243
244                 truncate_setsize(inode, attr->ia_size);
245                 affs_truncate(inode);
246         }
247
248         setattr_copy(inode, attr);
249         mark_inode_dirty(inode);
250
251         if (attr->ia_valid & ATTR_MODE)
252                 mode_to_prot(inode);
253 out:
254         return error;
255 }
256
257 void
258 affs_evict_inode(struct inode *inode)
259 {
260         unsigned long cache_page;
261         pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
262                  inode->i_ino, inode->i_nlink);
263         truncate_inode_pages_final(&inode->i_data);
264
265         if (!inode->i_nlink) {
266                 inode->i_size = 0;
267                 affs_truncate(inode);
268         }
269
270         invalidate_inode_buffers(inode);
271         clear_inode(inode);
272         affs_free_prealloc(inode);
273         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
274         if (cache_page) {
275                 pr_debug("freeing ext cache\n");
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;
283
284         if (!inode->i_nlink)
285                 affs_free_block(inode->i_sb, inode->i_ino);
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         set_nlink(inode, 1);
312         inode->i_mtime   = inode->i_atime = inode->i_ctime = current_time(inode);
313         atomic_set(&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;
351         u32 block = 0;
352         int retval;
353
354         pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
355                  dir->i_ino, inode->i_ino, dentry, 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                 retval = -ENOSPC;
367                 block = affs_alloc_block(dir, dir->i_ino);
368                 if (!block)
369                         goto err;
370                 retval = -EIO;
371                 inode_bh = bh;
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                 set_nlink(inode, 2);
395                 ihold(inode);
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 }