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