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 | |
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); | |
22 | static int minix_statfs(struct super_block *sb, struct kstatfs *buf); | |
23 | static int minix_remount (struct super_block * sb, int * flags, char * data); | |
24 | ||
25 | static void minix_delete_inode(struct inode *inode) | |
26 | { | |
27 | inode->i_size = 0; | |
28 | minix_truncate(inode); | |
29 | minix_free_inode(inode); | |
30 | } | |
31 | ||
32 | static void minix_put_super(struct super_block *sb) | |
33 | { | |
34 | int i; | |
35 | struct minix_sb_info *sbi = minix_sb(sb); | |
36 | ||
37 | if (!(sb->s_flags & MS_RDONLY)) { | |
38 | sbi->s_ms->s_state = sbi->s_mount_state; | |
39 | mark_buffer_dirty(sbi->s_sbh); | |
40 | } | |
41 | for (i = 0; i < sbi->s_imap_blocks; i++) | |
42 | brelse(sbi->s_imap[i]); | |
43 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
44 | brelse(sbi->s_zmap[i]); | |
45 | brelse (sbi->s_sbh); | |
46 | kfree(sbi->s_imap); | |
47 | sb->s_fs_info = NULL; | |
48 | kfree(sbi); | |
49 | ||
50 | return; | |
51 | } | |
52 | ||
53 | static kmem_cache_t * minix_inode_cachep; | |
54 | ||
55 | static struct inode *minix_alloc_inode(struct super_block *sb) | |
56 | { | |
57 | struct minix_inode_info *ei; | |
58 | ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, SLAB_KERNEL); | |
59 | if (!ei) | |
60 | return NULL; | |
61 | return &ei->vfs_inode; | |
62 | } | |
63 | ||
64 | static void minix_destroy_inode(struct inode *inode) | |
65 | { | |
66 | kmem_cache_free(minix_inode_cachep, minix_i(inode)); | |
67 | } | |
68 | ||
69 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
70 | { | |
71 | struct minix_inode_info *ei = (struct minix_inode_info *) foo; | |
72 | ||
73 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
74 | SLAB_CTOR_CONSTRUCTOR) | |
75 | inode_init_once(&ei->vfs_inode); | |
76 | } | |
77 | ||
78 | static int init_inodecache(void) | |
79 | { | |
80 | minix_inode_cachep = kmem_cache_create("minix_inode_cache", | |
81 | sizeof(struct minix_inode_info), | |
82 | 0, SLAB_RECLAIM_ACCOUNT, | |
83 | init_once, NULL); | |
84 | if (minix_inode_cachep == NULL) | |
85 | return -ENOMEM; | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static void destroy_inodecache(void) | |
90 | { | |
91 | if (kmem_cache_destroy(minix_inode_cachep)) | |
92 | printk(KERN_INFO "minix_inode_cache: not all structures were freed\n"); | |
93 | } | |
94 | ||
95 | static struct super_operations minix_sops = { | |
96 | .alloc_inode = minix_alloc_inode, | |
97 | .destroy_inode = minix_destroy_inode, | |
98 | .read_inode = minix_read_inode, | |
99 | .write_inode = minix_write_inode, | |
100 | .delete_inode = minix_delete_inode, | |
101 | .put_super = minix_put_super, | |
102 | .statfs = minix_statfs, | |
103 | .remount_fs = minix_remount, | |
104 | }; | |
105 | ||
106 | static int minix_remount (struct super_block * sb, int * flags, char * data) | |
107 | { | |
108 | struct minix_sb_info * sbi = minix_sb(sb); | |
109 | struct minix_super_block * ms; | |
110 | ||
111 | ms = sbi->s_ms; | |
112 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
113 | return 0; | |
114 | if (*flags & MS_RDONLY) { | |
115 | if (ms->s_state & MINIX_VALID_FS || | |
116 | !(sbi->s_mount_state & MINIX_VALID_FS)) | |
117 | return 0; | |
118 | /* Mounting a rw partition read-only. */ | |
119 | ms->s_state = sbi->s_mount_state; | |
120 | mark_buffer_dirty(sbi->s_sbh); | |
121 | } else { | |
122 | /* Mount a partition which is read-only, read-write. */ | |
123 | sbi->s_mount_state = ms->s_state; | |
124 | ms->s_state &= ~MINIX_VALID_FS; | |
125 | mark_buffer_dirty(sbi->s_sbh); | |
126 | ||
127 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
128 | printk ("MINIX-fs warning: remounting unchecked fs, " | |
129 | "running fsck is recommended.\n"); | |
130 | else if ((sbi->s_mount_state & MINIX_ERROR_FS)) | |
131 | printk ("MINIX-fs warning: remounting fs with errors, " | |
132 | "running fsck is recommended.\n"); | |
133 | } | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static int minix_fill_super(struct super_block *s, void *data, int silent) | |
138 | { | |
139 | struct buffer_head *bh; | |
140 | struct buffer_head **map; | |
141 | struct minix_super_block *ms; | |
142 | int i, block; | |
143 | struct inode *root_inode; | |
144 | struct minix_sb_info *sbi; | |
145 | ||
146 | sbi = kmalloc(sizeof(struct minix_sb_info), GFP_KERNEL); | |
147 | if (!sbi) | |
148 | return -ENOMEM; | |
149 | s->s_fs_info = sbi; | |
150 | memset(sbi, 0, sizeof(struct minix_sb_info)); | |
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 | */ | |
205 | i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); | |
206 | map = kmalloc(i, GFP_KERNEL); | |
207 | if (!map) | |
208 | goto out_no_map; | |
209 | memset(map, 0, i); | |
210 | sbi->s_imap = &map[0]; | |
211 | sbi->s_zmap = &map[sbi->s_imap_blocks]; | |
212 | ||
213 | block=2; | |
214 | for (i=0 ; i < sbi->s_imap_blocks ; i++) { | |
215 | if (!(sbi->s_imap[i]=sb_bread(s, block))) | |
216 | goto out_no_bitmap; | |
217 | block++; | |
218 | } | |
219 | for (i=0 ; i < sbi->s_zmap_blocks ; i++) { | |
220 | if (!(sbi->s_zmap[i]=sb_bread(s, block))) | |
221 | goto out_no_bitmap; | |
222 | block++; | |
223 | } | |
224 | ||
225 | minix_set_bit(0,sbi->s_imap[0]->b_data); | |
226 | minix_set_bit(0,sbi->s_zmap[0]->b_data); | |
227 | ||
228 | /* set up enough so that it can read an inode */ | |
229 | s->s_op = &minix_sops; | |
230 | root_inode = iget(s, MINIX_ROOT_INO); | |
231 | if (!root_inode || is_bad_inode(root_inode)) | |
232 | goto out_no_root; | |
233 | ||
234 | s->s_root = d_alloc_root(root_inode); | |
235 | if (!s->s_root) | |
236 | goto out_iput; | |
237 | ||
238 | if (!NO_TRUNCATE) | |
239 | s->s_root->d_op = &minix_dentry_operations; | |
240 | ||
241 | if (!(s->s_flags & MS_RDONLY)) { | |
242 | ms->s_state &= ~MINIX_VALID_FS; | |
243 | mark_buffer_dirty(bh); | |
244 | } | |
245 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
246 | printk ("MINIX-fs: mounting unchecked file system, " | |
247 | "running fsck is recommended.\n"); | |
248 | else if (sbi->s_mount_state & MINIX_ERROR_FS) | |
249 | printk ("MINIX-fs: mounting file system with errors, " | |
250 | "running fsck is recommended.\n"); | |
251 | return 0; | |
252 | ||
253 | out_iput: | |
254 | iput(root_inode); | |
255 | goto out_freemap; | |
256 | ||
257 | out_no_root: | |
258 | if (!silent) | |
259 | printk("MINIX-fs: get root inode failed\n"); | |
260 | goto out_freemap; | |
261 | ||
262 | out_no_bitmap: | |
263 | printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); | |
264 | out_freemap: | |
265 | for (i = 0; i < sbi->s_imap_blocks; i++) | |
266 | brelse(sbi->s_imap[i]); | |
267 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
268 | brelse(sbi->s_zmap[i]); | |
269 | kfree(sbi->s_imap); | |
270 | goto out_release; | |
271 | ||
272 | out_no_map: | |
273 | if (!silent) | |
274 | printk ("MINIX-fs: can't allocate map\n"); | |
275 | goto out_release; | |
276 | ||
277 | out_no_fs: | |
278 | if (!silent) | |
279 | printk("VFS: Can't find a Minix or Minix V2 filesystem on device " | |
280 | "%s.\n", s->s_id); | |
281 | out_release: | |
282 | brelse(bh); | |
283 | goto out; | |
284 | ||
285 | out_bad_hblock: | |
286 | printk("MINIX-fs: blocksize too small for device.\n"); | |
287 | goto out; | |
288 | ||
289 | out_bad_sb: | |
290 | printk("MINIX-fs: unable to read superblock\n"); | |
291 | out: | |
292 | s->s_fs_info = NULL; | |
293 | kfree(sbi); | |
294 | return -EINVAL; | |
295 | } | |
296 | ||
297 | static int minix_statfs(struct super_block *sb, struct kstatfs *buf) | |
298 | { | |
299 | struct minix_sb_info *sbi = minix_sb(sb); | |
300 | buf->f_type = sb->s_magic; | |
301 | buf->f_bsize = sb->s_blocksize; | |
302 | buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; | |
303 | buf->f_bfree = minix_count_free_blocks(sbi); | |
304 | buf->f_bavail = buf->f_bfree; | |
305 | buf->f_files = sbi->s_ninodes; | |
306 | buf->f_ffree = minix_count_free_inodes(sbi); | |
307 | buf->f_namelen = sbi->s_namelen; | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static int minix_get_block(struct inode *inode, sector_t block, | |
312 | struct buffer_head *bh_result, int create) | |
313 | { | |
314 | if (INODE_VERSION(inode) == MINIX_V1) | |
315 | return V1_minix_get_block(inode, block, bh_result, create); | |
316 | else | |
317 | return V2_minix_get_block(inode, block, bh_result, create); | |
318 | } | |
319 | ||
320 | static int minix_writepage(struct page *page, struct writeback_control *wbc) | |
321 | { | |
322 | return block_write_full_page(page, minix_get_block, wbc); | |
323 | } | |
324 | static int minix_readpage(struct file *file, struct page *page) | |
325 | { | |
326 | return block_read_full_page(page,minix_get_block); | |
327 | } | |
328 | static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) | |
329 | { | |
330 | return block_prepare_write(page,from,to,minix_get_block); | |
331 | } | |
332 | static sector_t minix_bmap(struct address_space *mapping, sector_t block) | |
333 | { | |
334 | return generic_block_bmap(mapping,block,minix_get_block); | |
335 | } | |
336 | static struct address_space_operations minix_aops = { | |
337 | .readpage = minix_readpage, | |
338 | .writepage = minix_writepage, | |
339 | .sync_page = block_sync_page, | |
340 | .prepare_write = minix_prepare_write, | |
341 | .commit_write = generic_commit_write, | |
342 | .bmap = minix_bmap | |
343 | }; | |
344 | ||
345 | static struct inode_operations minix_symlink_inode_operations = { | |
346 | .readlink = generic_readlink, | |
347 | .follow_link = page_follow_link_light, | |
348 | .put_link = page_put_link, | |
349 | .getattr = minix_getattr, | |
350 | }; | |
351 | ||
352 | void minix_set_inode(struct inode *inode, dev_t rdev) | |
353 | { | |
354 | if (S_ISREG(inode->i_mode)) { | |
355 | inode->i_op = &minix_file_inode_operations; | |
356 | inode->i_fop = &minix_file_operations; | |
357 | inode->i_mapping->a_ops = &minix_aops; | |
358 | } else if (S_ISDIR(inode->i_mode)) { | |
359 | inode->i_op = &minix_dir_inode_operations; | |
360 | inode->i_fop = &minix_dir_operations; | |
361 | inode->i_mapping->a_ops = &minix_aops; | |
362 | } else if (S_ISLNK(inode->i_mode)) { | |
363 | inode->i_op = &minix_symlink_inode_operations; | |
364 | inode->i_mapping->a_ops = &minix_aops; | |
365 | } else | |
366 | init_special_inode(inode, inode->i_mode, rdev); | |
367 | } | |
368 | ||
369 | /* | |
370 | * The minix V1 function to read an inode. | |
371 | */ | |
372 | static void V1_minix_read_inode(struct inode * inode) | |
373 | { | |
374 | struct buffer_head * bh; | |
375 | struct minix_inode * raw_inode; | |
376 | struct minix_inode_info *minix_inode = minix_i(inode); | |
377 | int i; | |
378 | ||
379 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
380 | if (!raw_inode) { | |
381 | make_bad_inode(inode); | |
382 | return; | |
383 | } | |
384 | inode->i_mode = raw_inode->i_mode; | |
385 | inode->i_uid = (uid_t)raw_inode->i_uid; | |
386 | inode->i_gid = (gid_t)raw_inode->i_gid; | |
387 | inode->i_nlink = raw_inode->i_nlinks; | |
388 | inode->i_size = raw_inode->i_size; | |
389 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; | |
390 | inode->i_mtime.tv_nsec = 0; | |
391 | inode->i_atime.tv_nsec = 0; | |
392 | inode->i_ctime.tv_nsec = 0; | |
393 | inode->i_blocks = inode->i_blksize = 0; | |
394 | for (i = 0; i < 9; i++) | |
395 | minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; | |
396 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
397 | brelse(bh); | |
398 | } | |
399 | ||
400 | /* | |
401 | * The minix V2 function to read an inode. | |
402 | */ | |
403 | static void V2_minix_read_inode(struct inode * inode) | |
404 | { | |
405 | struct buffer_head * bh; | |
406 | struct minix2_inode * raw_inode; | |
407 | struct minix_inode_info *minix_inode = minix_i(inode); | |
408 | int i; | |
409 | ||
410 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
411 | if (!raw_inode) { | |
412 | make_bad_inode(inode); | |
413 | return; | |
414 | } | |
415 | inode->i_mode = raw_inode->i_mode; | |
416 | inode->i_uid = (uid_t)raw_inode->i_uid; | |
417 | inode->i_gid = (gid_t)raw_inode->i_gid; | |
418 | inode->i_nlink = raw_inode->i_nlinks; | |
419 | inode->i_size = raw_inode->i_size; | |
420 | inode->i_mtime.tv_sec = raw_inode->i_mtime; | |
421 | inode->i_atime.tv_sec = raw_inode->i_atime; | |
422 | inode->i_ctime.tv_sec = raw_inode->i_ctime; | |
423 | inode->i_mtime.tv_nsec = 0; | |
424 | inode->i_atime.tv_nsec = 0; | |
425 | inode->i_ctime.tv_nsec = 0; | |
426 | inode->i_blocks = inode->i_blksize = 0; | |
427 | for (i = 0; i < 10; i++) | |
428 | minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; | |
429 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
430 | brelse(bh); | |
431 | } | |
432 | ||
433 | /* | |
434 | * The global function to read an inode. | |
435 | */ | |
436 | static void minix_read_inode(struct inode * inode) | |
437 | { | |
438 | if (INODE_VERSION(inode) == MINIX_V1) | |
439 | V1_minix_read_inode(inode); | |
440 | else | |
441 | V2_minix_read_inode(inode); | |
442 | } | |
443 | ||
444 | /* | |
445 | * The minix V1 function to synchronize an inode. | |
446 | */ | |
447 | static struct buffer_head * V1_minix_update_inode(struct inode * inode) | |
448 | { | |
449 | struct buffer_head * bh; | |
450 | struct minix_inode * raw_inode; | |
451 | struct minix_inode_info *minix_inode = minix_i(inode); | |
452 | int i; | |
453 | ||
454 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
455 | if (!raw_inode) | |
456 | return NULL; | |
457 | raw_inode->i_mode = inode->i_mode; | |
458 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); | |
459 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); | |
460 | raw_inode->i_nlinks = inode->i_nlink; | |
461 | raw_inode->i_size = inode->i_size; | |
462 | raw_inode->i_time = inode->i_mtime.tv_sec; | |
463 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
464 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
465 | else for (i = 0; i < 9; i++) | |
466 | raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; | |
467 | mark_buffer_dirty(bh); | |
468 | return bh; | |
469 | } | |
470 | ||
471 | /* | |
472 | * The minix V2 function to synchronize an inode. | |
473 | */ | |
474 | static struct buffer_head * V2_minix_update_inode(struct inode * inode) | |
475 | { | |
476 | struct buffer_head * bh; | |
477 | struct minix2_inode * raw_inode; | |
478 | struct minix_inode_info *minix_inode = minix_i(inode); | |
479 | int i; | |
480 | ||
481 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
482 | if (!raw_inode) | |
483 | return NULL; | |
484 | raw_inode->i_mode = inode->i_mode; | |
485 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); | |
486 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); | |
487 | raw_inode->i_nlinks = inode->i_nlink; | |
488 | raw_inode->i_size = inode->i_size; | |
489 | raw_inode->i_mtime = inode->i_mtime.tv_sec; | |
490 | raw_inode->i_atime = inode->i_atime.tv_sec; | |
491 | raw_inode->i_ctime = inode->i_ctime.tv_sec; | |
492 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
493 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
494 | else for (i = 0; i < 10; i++) | |
495 | raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; | |
496 | mark_buffer_dirty(bh); | |
497 | return bh; | |
498 | } | |
499 | ||
500 | static struct buffer_head *minix_update_inode(struct inode *inode) | |
501 | { | |
502 | if (INODE_VERSION(inode) == MINIX_V1) | |
503 | return V1_minix_update_inode(inode); | |
504 | else | |
505 | return V2_minix_update_inode(inode); | |
506 | } | |
507 | ||
508 | static int minix_write_inode(struct inode * inode, int wait) | |
509 | { | |
510 | brelse(minix_update_inode(inode)); | |
511 | return 0; | |
512 | } | |
513 | ||
514 | int minix_sync_inode(struct inode * inode) | |
515 | { | |
516 | int err = 0; | |
517 | struct buffer_head *bh; | |
518 | ||
519 | bh = minix_update_inode(inode); | |
520 | if (bh && buffer_dirty(bh)) | |
521 | { | |
522 | sync_dirty_buffer(bh); | |
523 | if (buffer_req(bh) && !buffer_uptodate(bh)) | |
524 | { | |
525 | printk ("IO error syncing minix inode [%s:%08lx]\n", | |
526 | inode->i_sb->s_id, inode->i_ino); | |
527 | err = -1; | |
528 | } | |
529 | } | |
530 | else if (!bh) | |
531 | err = -1; | |
532 | brelse (bh); | |
533 | return err; | |
534 | } | |
535 | ||
536 | int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
537 | { | |
538 | generic_fillattr(dentry->d_inode, stat); | |
539 | if (INODE_VERSION(dentry->d_inode) == MINIX_V1) | |
540 | stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size); | |
541 | else | |
542 | stat->blocks = (BLOCK_SIZE / 512) * V2_minix_blocks(stat->size); | |
543 | stat->blksize = BLOCK_SIZE; | |
544 | return 0; | |
545 | } | |
546 | ||
547 | /* | |
548 | * The function that is called for file truncation. | |
549 | */ | |
550 | void minix_truncate(struct inode * inode) | |
551 | { | |
552 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) | |
553 | return; | |
554 | if (INODE_VERSION(inode) == MINIX_V1) | |
555 | V1_minix_truncate(inode); | |
556 | else | |
557 | V2_minix_truncate(inode); | |
558 | } | |
559 | ||
560 | static struct super_block *minix_get_sb(struct file_system_type *fs_type, | |
561 | int flags, const char *dev_name, void *data) | |
562 | { | |
563 | return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super); | |
564 | } | |
565 | ||
566 | static struct file_system_type minix_fs_type = { | |
567 | .owner = THIS_MODULE, | |
568 | .name = "minix", | |
569 | .get_sb = minix_get_sb, | |
570 | .kill_sb = kill_block_super, | |
571 | .fs_flags = FS_REQUIRES_DEV, | |
572 | }; | |
573 | ||
574 | static int __init init_minix_fs(void) | |
575 | { | |
576 | int err = init_inodecache(); | |
577 | if (err) | |
578 | goto out1; | |
579 | err = register_filesystem(&minix_fs_type); | |
580 | if (err) | |
581 | goto out; | |
582 | return 0; | |
583 | out: | |
584 | destroy_inodecache(); | |
585 | out1: | |
586 | return err; | |
587 | } | |
588 | ||
589 | static void __exit exit_minix_fs(void) | |
590 | { | |
591 | unregister_filesystem(&minix_fs_type); | |
592 | destroy_inodecache(); | |
593 | } | |
594 | ||
595 | module_init(init_minix_fs) | |
596 | module_exit(exit_minix_fs) | |
597 | MODULE_LICENSE("GPL"); | |
598 |