Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/minix/inode.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl) | |
7 | * Minix V2 fs support. | |
8 | * | |
9 | * Modified for 680x0 by Andreas Schwab | |
939b00df | 10 | * Updated to filesystem version 3 by Daniel Aragones |
1da177e4 LT |
11 | */ |
12 | ||
13 | #include <linux/module.h> | |
14 | #include "minix.h" | |
15 | #include <linux/buffer_head.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/highuid.h> | |
19 | #include <linux/vfs.h> | |
20 | ||
21 | static void minix_read_inode(struct inode * inode); | |
22 | static int minix_write_inode(struct inode * inode, int wait); | |
726c3342 | 23 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 LT |
24 | static int minix_remount (struct super_block * sb, int * flags, char * data); |
25 | ||
26 | static void minix_delete_inode(struct inode *inode) | |
27 | { | |
fef26658 | 28 | truncate_inode_pages(&inode->i_data, 0); |
1da177e4 LT |
29 | inode->i_size = 0; |
30 | minix_truncate(inode); | |
31 | minix_free_inode(inode); | |
32 | } | |
33 | ||
34 | static void minix_put_super(struct super_block *sb) | |
35 | { | |
36 | int i; | |
37 | struct minix_sb_info *sbi = minix_sb(sb); | |
38 | ||
39 | if (!(sb->s_flags & MS_RDONLY)) { | |
939b00df AB |
40 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
41 | sbi->s_ms->s_state = sbi->s_mount_state; | |
1da177e4 LT |
42 | mark_buffer_dirty(sbi->s_sbh); |
43 | } | |
44 | for (i = 0; i < sbi->s_imap_blocks; i++) | |
45 | brelse(sbi->s_imap[i]); | |
46 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
47 | brelse(sbi->s_zmap[i]); | |
48 | brelse (sbi->s_sbh); | |
49 | kfree(sbi->s_imap); | |
50 | sb->s_fs_info = NULL; | |
51 | kfree(sbi); | |
52 | ||
53 | return; | |
54 | } | |
55 | ||
e18b890b | 56 | static struct kmem_cache * minix_inode_cachep; |
1da177e4 LT |
57 | |
58 | static struct inode *minix_alloc_inode(struct super_block *sb) | |
59 | { | |
60 | struct minix_inode_info *ei; | |
e94b1766 | 61 | ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
62 | if (!ei) |
63 | return NULL; | |
64 | return &ei->vfs_inode; | |
65 | } | |
66 | ||
67 | static void minix_destroy_inode(struct inode *inode) | |
68 | { | |
69 | kmem_cache_free(minix_inode_cachep, minix_i(inode)); | |
70 | } | |
71 | ||
4ba9b9d0 | 72 | static void init_once(struct kmem_cache * cachep, void *foo) |
1da177e4 LT |
73 | { |
74 | struct minix_inode_info *ei = (struct minix_inode_info *) foo; | |
75 | ||
a35afb83 | 76 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 77 | } |
20c2df83 | 78 | |
1da177e4 LT |
79 | static int init_inodecache(void) |
80 | { | |
81 | minix_inode_cachep = kmem_cache_create("minix_inode_cache", | |
82 | sizeof(struct minix_inode_info), | |
fffb60f9 PJ |
83 | 0, (SLAB_RECLAIM_ACCOUNT| |
84 | SLAB_MEM_SPREAD), | |
20c2df83 | 85 | init_once); |
1da177e4 LT |
86 | if (minix_inode_cachep == NULL) |
87 | return -ENOMEM; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static void destroy_inodecache(void) | |
92 | { | |
1a1d92c1 | 93 | kmem_cache_destroy(minix_inode_cachep); |
1da177e4 LT |
94 | } |
95 | ||
ee9b6d61 | 96 | static const struct super_operations minix_sops = { |
1da177e4 LT |
97 | .alloc_inode = minix_alloc_inode, |
98 | .destroy_inode = minix_destroy_inode, | |
99 | .read_inode = minix_read_inode, | |
100 | .write_inode = minix_write_inode, | |
101 | .delete_inode = minix_delete_inode, | |
102 | .put_super = minix_put_super, | |
103 | .statfs = minix_statfs, | |
104 | .remount_fs = minix_remount, | |
105 | }; | |
106 | ||
107 | static int minix_remount (struct super_block * sb, int * flags, char * data) | |
108 | { | |
109 | struct minix_sb_info * sbi = minix_sb(sb); | |
110 | struct minix_super_block * ms; | |
111 | ||
112 | ms = sbi->s_ms; | |
113 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
114 | return 0; | |
115 | if (*flags & MS_RDONLY) { | |
116 | if (ms->s_state & MINIX_VALID_FS || | |
117 | !(sbi->s_mount_state & MINIX_VALID_FS)) | |
118 | return 0; | |
119 | /* Mounting a rw partition read-only. */ | |
939b00df AB |
120 | if (sbi->s_version != MINIX_V3) |
121 | ms->s_state = sbi->s_mount_state; | |
1da177e4 LT |
122 | mark_buffer_dirty(sbi->s_sbh); |
123 | } else { | |
124 | /* Mount a partition which is read-only, read-write. */ | |
939b00df AB |
125 | if (sbi->s_version != MINIX_V3) { |
126 | sbi->s_mount_state = ms->s_state; | |
127 | ms->s_state &= ~MINIX_VALID_FS; | |
128 | } else { | |
129 | sbi->s_mount_state = MINIX_VALID_FS; | |
130 | } | |
1da177e4 LT |
131 | mark_buffer_dirty(sbi->s_sbh); |
132 | ||
133 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
11b84487 DV |
134 | printk("MINIX-fs warning: remounting unchecked fs, " |
135 | "running fsck is recommended\n"); | |
1da177e4 | 136 | else if ((sbi->s_mount_state & MINIX_ERROR_FS)) |
11b84487 DV |
137 | printk("MINIX-fs warning: remounting fs with errors, " |
138 | "running fsck is recommended\n"); | |
1da177e4 LT |
139 | } |
140 | return 0; | |
141 | } | |
142 | ||
143 | static int minix_fill_super(struct super_block *s, void *data, int silent) | |
144 | { | |
145 | struct buffer_head *bh; | |
146 | struct buffer_head **map; | |
147 | struct minix_super_block *ms; | |
939b00df AB |
148 | struct minix3_super_block *m3s = NULL; |
149 | unsigned long i, block; | |
1da177e4 LT |
150 | struct inode *root_inode; |
151 | struct minix_sb_info *sbi; | |
152 | ||
f8314dc6 | 153 | sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); |
1da177e4 LT |
154 | if (!sbi) |
155 | return -ENOMEM; | |
156 | s->s_fs_info = sbi; | |
1da177e4 | 157 | |
2ecd05ae AD |
158 | BUILD_BUG_ON(32 != sizeof (struct minix_inode)); |
159 | BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); | |
1da177e4 LT |
160 | |
161 | if (!sb_set_blocksize(s, BLOCK_SIZE)) | |
162 | goto out_bad_hblock; | |
163 | ||
164 | if (!(bh = sb_bread(s, 1))) | |
165 | goto out_bad_sb; | |
166 | ||
167 | ms = (struct minix_super_block *) bh->b_data; | |
168 | sbi->s_ms = ms; | |
169 | sbi->s_sbh = bh; | |
170 | sbi->s_mount_state = ms->s_state; | |
171 | sbi->s_ninodes = ms->s_ninodes; | |
172 | sbi->s_nzones = ms->s_nzones; | |
173 | sbi->s_imap_blocks = ms->s_imap_blocks; | |
174 | sbi->s_zmap_blocks = ms->s_zmap_blocks; | |
175 | sbi->s_firstdatazone = ms->s_firstdatazone; | |
176 | sbi->s_log_zone_size = ms->s_log_zone_size; | |
177 | sbi->s_max_size = ms->s_max_size; | |
178 | s->s_magic = ms->s_magic; | |
179 | if (s->s_magic == MINIX_SUPER_MAGIC) { | |
180 | sbi->s_version = MINIX_V1; | |
181 | sbi->s_dirsize = 16; | |
182 | sbi->s_namelen = 14; | |
183 | sbi->s_link_max = MINIX_LINK_MAX; | |
184 | } else if (s->s_magic == MINIX_SUPER_MAGIC2) { | |
185 | sbi->s_version = MINIX_V1; | |
186 | sbi->s_dirsize = 32; | |
187 | sbi->s_namelen = 30; | |
188 | sbi->s_link_max = MINIX_LINK_MAX; | |
189 | } else if (s->s_magic == MINIX2_SUPER_MAGIC) { | |
190 | sbi->s_version = MINIX_V2; | |
191 | sbi->s_nzones = ms->s_zones; | |
192 | sbi->s_dirsize = 16; | |
193 | sbi->s_namelen = 14; | |
194 | sbi->s_link_max = MINIX2_LINK_MAX; | |
195 | } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { | |
196 | sbi->s_version = MINIX_V2; | |
197 | sbi->s_nzones = ms->s_zones; | |
198 | sbi->s_dirsize = 32; | |
199 | sbi->s_namelen = 30; | |
200 | sbi->s_link_max = MINIX2_LINK_MAX; | |
939b00df AB |
201 | } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { |
202 | m3s = (struct minix3_super_block *) bh->b_data; | |
203 | s->s_magic = m3s->s_magic; | |
204 | sbi->s_imap_blocks = m3s->s_imap_blocks; | |
205 | sbi->s_zmap_blocks = m3s->s_zmap_blocks; | |
206 | sbi->s_firstdatazone = m3s->s_firstdatazone; | |
207 | sbi->s_log_zone_size = m3s->s_log_zone_size; | |
208 | sbi->s_max_size = m3s->s_max_size; | |
209 | sbi->s_ninodes = m3s->s_ninodes; | |
210 | sbi->s_nzones = m3s->s_zones; | |
211 | sbi->s_dirsize = 64; | |
212 | sbi->s_namelen = 60; | |
213 | sbi->s_version = MINIX_V3; | |
214 | sbi->s_link_max = MINIX2_LINK_MAX; | |
215 | sbi->s_mount_state = MINIX_VALID_FS; | |
216 | sb_set_blocksize(s, m3s->s_blocksize); | |
1da177e4 LT |
217 | } else |
218 | goto out_no_fs; | |
219 | ||
220 | /* | |
221 | * Allocate the buffer map to keep the superblock small. | |
222 | */ | |
f5fb09fa AB |
223 | if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) |
224 | goto out_illegal_sb; | |
1da177e4 | 225 | i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); |
f8314dc6 | 226 | map = kzalloc(i, GFP_KERNEL); |
1da177e4 LT |
227 | if (!map) |
228 | goto out_no_map; | |
1da177e4 LT |
229 | sbi->s_imap = &map[0]; |
230 | sbi->s_zmap = &map[sbi->s_imap_blocks]; | |
231 | ||
232 | block=2; | |
233 | for (i=0 ; i < sbi->s_imap_blocks ; i++) { | |
234 | if (!(sbi->s_imap[i]=sb_bread(s, block))) | |
235 | goto out_no_bitmap; | |
236 | block++; | |
237 | } | |
238 | for (i=0 ; i < sbi->s_zmap_blocks ; i++) { | |
239 | if (!(sbi->s_zmap[i]=sb_bread(s, block))) | |
240 | goto out_no_bitmap; | |
241 | block++; | |
242 | } | |
243 | ||
244 | minix_set_bit(0,sbi->s_imap[0]->b_data); | |
245 | minix_set_bit(0,sbi->s_zmap[0]->b_data); | |
246 | ||
247 | /* set up enough so that it can read an inode */ | |
248 | s->s_op = &minix_sops; | |
249 | root_inode = iget(s, MINIX_ROOT_INO); | |
250 | if (!root_inode || is_bad_inode(root_inode)) | |
251 | goto out_no_root; | |
252 | ||
253 | s->s_root = d_alloc_root(root_inode); | |
254 | if (!s->s_root) | |
255 | goto out_iput; | |
256 | ||
257 | if (!NO_TRUNCATE) | |
258 | s->s_root->d_op = &minix_dentry_operations; | |
259 | ||
260 | if (!(s->s_flags & MS_RDONLY)) { | |
939b00df AB |
261 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
262 | ms->s_state &= ~MINIX_VALID_FS; | |
1da177e4 LT |
263 | mark_buffer_dirty(bh); |
264 | } | |
265 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
11b84487 DV |
266 | printk("MINIX-fs: mounting unchecked file system, " |
267 | "running fsck is recommended\n"); | |
1da177e4 | 268 | else if (sbi->s_mount_state & MINIX_ERROR_FS) |
11b84487 DV |
269 | printk("MINIX-fs: mounting file system with errors, " |
270 | "running fsck is recommended\n"); | |
1da177e4 LT |
271 | return 0; |
272 | ||
273 | out_iput: | |
274 | iput(root_inode); | |
275 | goto out_freemap; | |
276 | ||
277 | out_no_root: | |
278 | if (!silent) | |
279 | printk("MINIX-fs: get root inode failed\n"); | |
280 | goto out_freemap; | |
281 | ||
282 | out_no_bitmap: | |
283 | printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); | |
f5fb09fa | 284 | out_freemap: |
1da177e4 LT |
285 | for (i = 0; i < sbi->s_imap_blocks; i++) |
286 | brelse(sbi->s_imap[i]); | |
287 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
288 | brelse(sbi->s_zmap[i]); | |
289 | kfree(sbi->s_imap); | |
290 | goto out_release; | |
291 | ||
292 | out_no_map: | |
293 | if (!silent) | |
11b84487 | 294 | printk("MINIX-fs: can't allocate map\n"); |
1da177e4 LT |
295 | goto out_release; |
296 | ||
f5fb09fa AB |
297 | out_illegal_sb: |
298 | if (!silent) | |
299 | printk("MINIX-fs: bad superblock\n"); | |
300 | goto out_release; | |
301 | ||
1da177e4 LT |
302 | out_no_fs: |
303 | if (!silent) | |
939b00df AB |
304 | printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " |
305 | "on device %s.\n", s->s_id); | |
f5fb09fa | 306 | out_release: |
1da177e4 LT |
307 | brelse(bh); |
308 | goto out; | |
309 | ||
310 | out_bad_hblock: | |
11b84487 | 311 | printk("MINIX-fs: blocksize too small for device\n"); |
1da177e4 LT |
312 | goto out; |
313 | ||
314 | out_bad_sb: | |
315 | printk("MINIX-fs: unable to read superblock\n"); | |
f5fb09fa | 316 | out: |
1da177e4 LT |
317 | s->s_fs_info = NULL; |
318 | kfree(sbi); | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
726c3342 | 322 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 323 | { |
726c3342 DH |
324 | struct minix_sb_info *sbi = minix_sb(dentry->d_sb); |
325 | buf->f_type = dentry->d_sb->s_magic; | |
326 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
1da177e4 LT |
327 | buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; |
328 | buf->f_bfree = minix_count_free_blocks(sbi); | |
329 | buf->f_bavail = buf->f_bfree; | |
330 | buf->f_files = sbi->s_ninodes; | |
331 | buf->f_ffree = minix_count_free_inodes(sbi); | |
332 | buf->f_namelen = sbi->s_namelen; | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static int minix_get_block(struct inode *inode, sector_t block, | |
337 | struct buffer_head *bh_result, int create) | |
338 | { | |
339 | if (INODE_VERSION(inode) == MINIX_V1) | |
340 | return V1_minix_get_block(inode, block, bh_result, create); | |
341 | else | |
342 | return V2_minix_get_block(inode, block, bh_result, create); | |
343 | } | |
344 | ||
345 | static int minix_writepage(struct page *page, struct writeback_control *wbc) | |
346 | { | |
347 | return block_write_full_page(page, minix_get_block, wbc); | |
348 | } | |
4a66af9e | 349 | |
1da177e4 LT |
350 | static int minix_readpage(struct file *file, struct page *page) |
351 | { | |
352 | return block_read_full_page(page,minix_get_block); | |
353 | } | |
4a66af9e NP |
354 | |
355 | int __minix_write_begin(struct file *file, struct address_space *mapping, | |
356 | loff_t pos, unsigned len, unsigned flags, | |
357 | struct page **pagep, void **fsdata) | |
1da177e4 | 358 | { |
4a66af9e NP |
359 | return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
360 | minix_get_block); | |
1da177e4 | 361 | } |
4a66af9e NP |
362 | |
363 | static int minix_write_begin(struct file *file, struct address_space *mapping, | |
364 | loff_t pos, unsigned len, unsigned flags, | |
365 | struct page **pagep, void **fsdata) | |
366 | { | |
367 | *pagep = NULL; | |
368 | return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata); | |
369 | } | |
370 | ||
1da177e4 LT |
371 | static sector_t minix_bmap(struct address_space *mapping, sector_t block) |
372 | { | |
373 | return generic_block_bmap(mapping,block,minix_get_block); | |
374 | } | |
4a66af9e | 375 | |
f5e54d6e | 376 | static const struct address_space_operations minix_aops = { |
1da177e4 LT |
377 | .readpage = minix_readpage, |
378 | .writepage = minix_writepage, | |
379 | .sync_page = block_sync_page, | |
4a66af9e NP |
380 | .write_begin = minix_write_begin, |
381 | .write_end = generic_write_end, | |
1da177e4 LT |
382 | .bmap = minix_bmap |
383 | }; | |
384 | ||
92e1d5be | 385 | static const struct inode_operations minix_symlink_inode_operations = { |
1da177e4 LT |
386 | .readlink = generic_readlink, |
387 | .follow_link = page_follow_link_light, | |
388 | .put_link = page_put_link, | |
389 | .getattr = minix_getattr, | |
390 | }; | |
391 | ||
392 | void minix_set_inode(struct inode *inode, dev_t rdev) | |
393 | { | |
394 | if (S_ISREG(inode->i_mode)) { | |
395 | inode->i_op = &minix_file_inode_operations; | |
396 | inode->i_fop = &minix_file_operations; | |
397 | inode->i_mapping->a_ops = &minix_aops; | |
398 | } else if (S_ISDIR(inode->i_mode)) { | |
399 | inode->i_op = &minix_dir_inode_operations; | |
400 | inode->i_fop = &minix_dir_operations; | |
401 | inode->i_mapping->a_ops = &minix_aops; | |
402 | } else if (S_ISLNK(inode->i_mode)) { | |
403 | inode->i_op = &minix_symlink_inode_operations; | |
404 | inode->i_mapping->a_ops = &minix_aops; | |
405 | } else | |
406 | init_special_inode(inode, inode->i_mode, rdev); | |
407 | } | |
408 | ||
409 | /* | |
410 | * The minix V1 function to read an inode. | |
411 | */ | |
412 | static void V1_minix_read_inode(struct inode * inode) | |
413 | { | |
414 | struct buffer_head * bh; | |
415 | struct minix_inode * raw_inode; | |
416 | struct minix_inode_info *minix_inode = minix_i(inode); | |
417 | int i; | |
418 | ||
419 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
420 | if (!raw_inode) { | |
421 | make_bad_inode(inode); | |
422 | return; | |
423 | } | |
424 | inode->i_mode = raw_inode->i_mode; | |
425 | inode->i_uid = (uid_t)raw_inode->i_uid; | |
426 | inode->i_gid = (gid_t)raw_inode->i_gid; | |
427 | inode->i_nlink = raw_inode->i_nlinks; | |
428 | inode->i_size = raw_inode->i_size; | |
429 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; | |
430 | inode->i_mtime.tv_nsec = 0; | |
431 | inode->i_atime.tv_nsec = 0; | |
432 | inode->i_ctime.tv_nsec = 0; | |
ba52de12 | 433 | inode->i_blocks = 0; |
1da177e4 LT |
434 | for (i = 0; i < 9; i++) |
435 | minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; | |
436 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
437 | brelse(bh); | |
438 | } | |
439 | ||
440 | /* | |
441 | * The minix V2 function to read an inode. | |
442 | */ | |
443 | static void V2_minix_read_inode(struct inode * inode) | |
444 | { | |
445 | struct buffer_head * bh; | |
446 | struct minix2_inode * raw_inode; | |
447 | struct minix_inode_info *minix_inode = minix_i(inode); | |
448 | int i; | |
449 | ||
450 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
451 | if (!raw_inode) { | |
452 | make_bad_inode(inode); | |
453 | return; | |
454 | } | |
455 | inode->i_mode = raw_inode->i_mode; | |
456 | inode->i_uid = (uid_t)raw_inode->i_uid; | |
457 | inode->i_gid = (gid_t)raw_inode->i_gid; | |
458 | inode->i_nlink = raw_inode->i_nlinks; | |
459 | inode->i_size = raw_inode->i_size; | |
460 | inode->i_mtime.tv_sec = raw_inode->i_mtime; | |
461 | inode->i_atime.tv_sec = raw_inode->i_atime; | |
462 | inode->i_ctime.tv_sec = raw_inode->i_ctime; | |
463 | inode->i_mtime.tv_nsec = 0; | |
464 | inode->i_atime.tv_nsec = 0; | |
465 | inode->i_ctime.tv_nsec = 0; | |
ba52de12 | 466 | inode->i_blocks = 0; |
1da177e4 LT |
467 | for (i = 0; i < 10; i++) |
468 | minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; | |
469 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
470 | brelse(bh); | |
471 | } | |
472 | ||
473 | /* | |
474 | * The global function to read an inode. | |
475 | */ | |
476 | static void minix_read_inode(struct inode * inode) | |
477 | { | |
478 | if (INODE_VERSION(inode) == MINIX_V1) | |
479 | V1_minix_read_inode(inode); | |
480 | else | |
481 | V2_minix_read_inode(inode); | |
482 | } | |
483 | ||
484 | /* | |
485 | * The minix V1 function to synchronize an inode. | |
486 | */ | |
487 | static struct buffer_head * V1_minix_update_inode(struct inode * inode) | |
488 | { | |
489 | struct buffer_head * bh; | |
490 | struct minix_inode * raw_inode; | |
491 | struct minix_inode_info *minix_inode = minix_i(inode); | |
492 | int i; | |
493 | ||
494 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
495 | if (!raw_inode) | |
496 | return NULL; | |
497 | raw_inode->i_mode = inode->i_mode; | |
498 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); | |
499 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); | |
500 | raw_inode->i_nlinks = inode->i_nlink; | |
501 | raw_inode->i_size = inode->i_size; | |
502 | raw_inode->i_time = inode->i_mtime.tv_sec; | |
503 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
504 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
505 | else for (i = 0; i < 9; i++) | |
506 | raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; | |
507 | mark_buffer_dirty(bh); | |
508 | return bh; | |
509 | } | |
510 | ||
511 | /* | |
512 | * The minix V2 function to synchronize an inode. | |
513 | */ | |
514 | static struct buffer_head * V2_minix_update_inode(struct inode * inode) | |
515 | { | |
516 | struct buffer_head * bh; | |
517 | struct minix2_inode * raw_inode; | |
518 | struct minix_inode_info *minix_inode = minix_i(inode); | |
519 | int i; | |
520 | ||
521 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
522 | if (!raw_inode) | |
523 | return NULL; | |
524 | raw_inode->i_mode = inode->i_mode; | |
525 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); | |
526 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); | |
527 | raw_inode->i_nlinks = inode->i_nlink; | |
528 | raw_inode->i_size = inode->i_size; | |
529 | raw_inode->i_mtime = inode->i_mtime.tv_sec; | |
530 | raw_inode->i_atime = inode->i_atime.tv_sec; | |
531 | raw_inode->i_ctime = inode->i_ctime.tv_sec; | |
532 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
533 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
534 | else for (i = 0; i < 10; i++) | |
535 | raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; | |
536 | mark_buffer_dirty(bh); | |
537 | return bh; | |
538 | } | |
539 | ||
540 | static struct buffer_head *minix_update_inode(struct inode *inode) | |
541 | { | |
542 | if (INODE_VERSION(inode) == MINIX_V1) | |
543 | return V1_minix_update_inode(inode); | |
544 | else | |
545 | return V2_minix_update_inode(inode); | |
546 | } | |
547 | ||
548 | static int minix_write_inode(struct inode * inode, int wait) | |
549 | { | |
550 | brelse(minix_update_inode(inode)); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | int minix_sync_inode(struct inode * inode) | |
555 | { | |
556 | int err = 0; | |
557 | struct buffer_head *bh; | |
558 | ||
559 | bh = minix_update_inode(inode); | |
560 | if (bh && buffer_dirty(bh)) | |
561 | { | |
562 | sync_dirty_buffer(bh); | |
563 | if (buffer_req(bh) && !buffer_uptodate(bh)) | |
564 | { | |
11b84487 | 565 | printk("IO error syncing minix inode [%s:%08lx]\n", |
1da177e4 LT |
566 | inode->i_sb->s_id, inode->i_ino); |
567 | err = -1; | |
568 | } | |
569 | } | |
570 | else if (!bh) | |
571 | err = -1; | |
572 | brelse (bh); | |
573 | return err; | |
574 | } | |
575 | ||
576 | int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
577 | { | |
939b00df AB |
578 | struct inode *dir = dentry->d_parent->d_inode; |
579 | struct super_block *sb = dir->i_sb; | |
1da177e4 LT |
580 | generic_fillattr(dentry->d_inode, stat); |
581 | if (INODE_VERSION(dentry->d_inode) == MINIX_V1) | |
939b00df | 582 | stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); |
1da177e4 | 583 | else |
939b00df AB |
584 | stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); |
585 | stat->blksize = sb->s_blocksize; | |
1da177e4 LT |
586 | return 0; |
587 | } | |
588 | ||
589 | /* | |
590 | * The function that is called for file truncation. | |
591 | */ | |
592 | void minix_truncate(struct inode * inode) | |
593 | { | |
594 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) | |
595 | return; | |
596 | if (INODE_VERSION(inode) == MINIX_V1) | |
597 | V1_minix_truncate(inode); | |
598 | else | |
599 | V2_minix_truncate(inode); | |
600 | } | |
601 | ||
454e2398 DH |
602 | static int minix_get_sb(struct file_system_type *fs_type, |
603 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 604 | { |
454e2398 DH |
605 | return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super, |
606 | mnt); | |
1da177e4 LT |
607 | } |
608 | ||
609 | static struct file_system_type minix_fs_type = { | |
610 | .owner = THIS_MODULE, | |
611 | .name = "minix", | |
612 | .get_sb = minix_get_sb, | |
613 | .kill_sb = kill_block_super, | |
614 | .fs_flags = FS_REQUIRES_DEV, | |
615 | }; | |
616 | ||
617 | static int __init init_minix_fs(void) | |
618 | { | |
619 | int err = init_inodecache(); | |
620 | if (err) | |
621 | goto out1; | |
622 | err = register_filesystem(&minix_fs_type); | |
623 | if (err) | |
624 | goto out; | |
625 | return 0; | |
626 | out: | |
627 | destroy_inodecache(); | |
628 | out1: | |
629 | return err; | |
630 | } | |
631 | ||
632 | static void __exit exit_minix_fs(void) | |
633 | { | |
634 | unregister_filesystem(&minix_fs_type); | |
635 | destroy_inodecache(); | |
636 | } | |
637 | ||
638 | module_init(init_minix_fs) | |
639 | module_exit(exit_minix_fs) | |
640 | MODULE_LICENSE("GPL"); | |
641 |