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1 | /* | |
2 | * linux/fs/minix/inode.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * Copyright (C) 1996 Gertjan van Wingerde | |
7 | * Minix V2 fs support. | |
8 | * | |
9 | * Modified for 680x0 by Andreas Schwab | |
10 | * Updated to filesystem version 3 by Daniel Aragones | |
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 | #include <linux/writeback.h> | |
21 | ||
22 | static int minix_write_inode(struct inode *inode, | |
23 | struct writeback_control *wbc); | |
24 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); | |
25 | static int minix_remount (struct super_block * sb, int * flags, char * data); | |
26 | ||
27 | static void minix_evict_inode(struct inode *inode) | |
28 | { | |
29 | truncate_inode_pages(&inode->i_data, 0); | |
30 | if (!inode->i_nlink) { | |
31 | inode->i_size = 0; | |
32 | minix_truncate(inode); | |
33 | } | |
34 | invalidate_inode_buffers(inode); | |
35 | end_writeback(inode); | |
36 | if (!inode->i_nlink) | |
37 | minix_free_inode(inode); | |
38 | } | |
39 | ||
40 | static void minix_put_super(struct super_block *sb) | |
41 | { | |
42 | int i; | |
43 | struct minix_sb_info *sbi = minix_sb(sb); | |
44 | ||
45 | if (!(sb->s_flags & MS_RDONLY)) { | |
46 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ | |
47 | sbi->s_ms->s_state = sbi->s_mount_state; | |
48 | mark_buffer_dirty(sbi->s_sbh); | |
49 | } | |
50 | for (i = 0; i < sbi->s_imap_blocks; i++) | |
51 | brelse(sbi->s_imap[i]); | |
52 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
53 | brelse(sbi->s_zmap[i]); | |
54 | brelse (sbi->s_sbh); | |
55 | kfree(sbi->s_imap); | |
56 | sb->s_fs_info = NULL; | |
57 | kfree(sbi); | |
58 | } | |
59 | ||
60 | static struct kmem_cache * minix_inode_cachep; | |
61 | ||
62 | static struct inode *minix_alloc_inode(struct super_block *sb) | |
63 | { | |
64 | struct minix_inode_info *ei; | |
65 | ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); | |
66 | if (!ei) | |
67 | return NULL; | |
68 | return &ei->vfs_inode; | |
69 | } | |
70 | ||
71 | static void minix_i_callback(struct rcu_head *head) | |
72 | { | |
73 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
74 | kmem_cache_free(minix_inode_cachep, minix_i(inode)); | |
75 | } | |
76 | ||
77 | static void minix_destroy_inode(struct inode *inode) | |
78 | { | |
79 | call_rcu(&inode->i_rcu, minix_i_callback); | |
80 | } | |
81 | ||
82 | static void init_once(void *foo) | |
83 | { | |
84 | struct minix_inode_info *ei = (struct minix_inode_info *) foo; | |
85 | ||
86 | inode_init_once(&ei->vfs_inode); | |
87 | } | |
88 | ||
89 | static int init_inodecache(void) | |
90 | { | |
91 | minix_inode_cachep = kmem_cache_create("minix_inode_cache", | |
92 | sizeof(struct minix_inode_info), | |
93 | 0, (SLAB_RECLAIM_ACCOUNT| | |
94 | SLAB_MEM_SPREAD), | |
95 | init_once); | |
96 | if (minix_inode_cachep == NULL) | |
97 | return -ENOMEM; | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static void destroy_inodecache(void) | |
102 | { | |
103 | kmem_cache_destroy(minix_inode_cachep); | |
104 | } | |
105 | ||
106 | static const struct super_operations minix_sops = { | |
107 | .alloc_inode = minix_alloc_inode, | |
108 | .destroy_inode = minix_destroy_inode, | |
109 | .write_inode = minix_write_inode, | |
110 | .evict_inode = minix_evict_inode, | |
111 | .put_super = minix_put_super, | |
112 | .statfs = minix_statfs, | |
113 | .remount_fs = minix_remount, | |
114 | }; | |
115 | ||
116 | static int minix_remount (struct super_block * sb, int * flags, char * data) | |
117 | { | |
118 | struct minix_sb_info * sbi = minix_sb(sb); | |
119 | struct minix_super_block * ms; | |
120 | ||
121 | ms = sbi->s_ms; | |
122 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) | |
123 | return 0; | |
124 | if (*flags & MS_RDONLY) { | |
125 | if (ms->s_state & MINIX_VALID_FS || | |
126 | !(sbi->s_mount_state & MINIX_VALID_FS)) | |
127 | return 0; | |
128 | /* Mounting a rw partition read-only. */ | |
129 | if (sbi->s_version != MINIX_V3) | |
130 | ms->s_state = sbi->s_mount_state; | |
131 | mark_buffer_dirty(sbi->s_sbh); | |
132 | } else { | |
133 | /* Mount a partition which is read-only, read-write. */ | |
134 | if (sbi->s_version != MINIX_V3) { | |
135 | sbi->s_mount_state = ms->s_state; | |
136 | ms->s_state &= ~MINIX_VALID_FS; | |
137 | } else { | |
138 | sbi->s_mount_state = MINIX_VALID_FS; | |
139 | } | |
140 | mark_buffer_dirty(sbi->s_sbh); | |
141 | ||
142 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
143 | printk("MINIX-fs warning: remounting unchecked fs, " | |
144 | "running fsck is recommended\n"); | |
145 | else if ((sbi->s_mount_state & MINIX_ERROR_FS)) | |
146 | printk("MINIX-fs warning: remounting fs with errors, " | |
147 | "running fsck is recommended\n"); | |
148 | } | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int minix_fill_super(struct super_block *s, void *data, int silent) | |
153 | { | |
154 | struct buffer_head *bh; | |
155 | struct buffer_head **map; | |
156 | struct minix_super_block *ms; | |
157 | struct minix3_super_block *m3s = NULL; | |
158 | unsigned long i, block; | |
159 | struct inode *root_inode; | |
160 | struct minix_sb_info *sbi; | |
161 | int ret = -EINVAL; | |
162 | ||
163 | sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); | |
164 | if (!sbi) | |
165 | return -ENOMEM; | |
166 | s->s_fs_info = sbi; | |
167 | ||
168 | BUILD_BUG_ON(32 != sizeof (struct minix_inode)); | |
169 | BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); | |
170 | ||
171 | if (!sb_set_blocksize(s, BLOCK_SIZE)) | |
172 | goto out_bad_hblock; | |
173 | ||
174 | if (!(bh = sb_bread(s, 1))) | |
175 | goto out_bad_sb; | |
176 | ||
177 | ms = (struct minix_super_block *) bh->b_data; | |
178 | sbi->s_ms = ms; | |
179 | sbi->s_sbh = bh; | |
180 | sbi->s_mount_state = ms->s_state; | |
181 | sbi->s_ninodes = ms->s_ninodes; | |
182 | sbi->s_nzones = ms->s_nzones; | |
183 | sbi->s_imap_blocks = ms->s_imap_blocks; | |
184 | sbi->s_zmap_blocks = ms->s_zmap_blocks; | |
185 | sbi->s_firstdatazone = ms->s_firstdatazone; | |
186 | sbi->s_log_zone_size = ms->s_log_zone_size; | |
187 | sbi->s_max_size = ms->s_max_size; | |
188 | s->s_magic = ms->s_magic; | |
189 | if (s->s_magic == MINIX_SUPER_MAGIC) { | |
190 | sbi->s_version = MINIX_V1; | |
191 | sbi->s_dirsize = 16; | |
192 | sbi->s_namelen = 14; | |
193 | s->s_max_links = MINIX_LINK_MAX; | |
194 | } else if (s->s_magic == MINIX_SUPER_MAGIC2) { | |
195 | sbi->s_version = MINIX_V1; | |
196 | sbi->s_dirsize = 32; | |
197 | sbi->s_namelen = 30; | |
198 | s->s_max_links = MINIX_LINK_MAX; | |
199 | } else if (s->s_magic == MINIX2_SUPER_MAGIC) { | |
200 | sbi->s_version = MINIX_V2; | |
201 | sbi->s_nzones = ms->s_zones; | |
202 | sbi->s_dirsize = 16; | |
203 | sbi->s_namelen = 14; | |
204 | s->s_max_links = MINIX2_LINK_MAX; | |
205 | } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { | |
206 | sbi->s_version = MINIX_V2; | |
207 | sbi->s_nzones = ms->s_zones; | |
208 | sbi->s_dirsize = 32; | |
209 | sbi->s_namelen = 30; | |
210 | s->s_max_links = MINIX2_LINK_MAX; | |
211 | } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { | |
212 | m3s = (struct minix3_super_block *) bh->b_data; | |
213 | s->s_magic = m3s->s_magic; | |
214 | sbi->s_imap_blocks = m3s->s_imap_blocks; | |
215 | sbi->s_zmap_blocks = m3s->s_zmap_blocks; | |
216 | sbi->s_firstdatazone = m3s->s_firstdatazone; | |
217 | sbi->s_log_zone_size = m3s->s_log_zone_size; | |
218 | sbi->s_max_size = m3s->s_max_size; | |
219 | sbi->s_ninodes = m3s->s_ninodes; | |
220 | sbi->s_nzones = m3s->s_zones; | |
221 | sbi->s_dirsize = 64; | |
222 | sbi->s_namelen = 60; | |
223 | sbi->s_version = MINIX_V3; | |
224 | sbi->s_mount_state = MINIX_VALID_FS; | |
225 | sb_set_blocksize(s, m3s->s_blocksize); | |
226 | s->s_max_links = MINIX2_LINK_MAX; | |
227 | } else | |
228 | goto out_no_fs; | |
229 | ||
230 | /* | |
231 | * Allocate the buffer map to keep the superblock small. | |
232 | */ | |
233 | if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) | |
234 | goto out_illegal_sb; | |
235 | i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); | |
236 | map = kzalloc(i, GFP_KERNEL); | |
237 | if (!map) | |
238 | goto out_no_map; | |
239 | sbi->s_imap = &map[0]; | |
240 | sbi->s_zmap = &map[sbi->s_imap_blocks]; | |
241 | ||
242 | block=2; | |
243 | for (i=0 ; i < sbi->s_imap_blocks ; i++) { | |
244 | if (!(sbi->s_imap[i]=sb_bread(s, block))) | |
245 | goto out_no_bitmap; | |
246 | block++; | |
247 | } | |
248 | for (i=0 ; i < sbi->s_zmap_blocks ; i++) { | |
249 | if (!(sbi->s_zmap[i]=sb_bread(s, block))) | |
250 | goto out_no_bitmap; | |
251 | block++; | |
252 | } | |
253 | ||
254 | minix_set_bit(0,sbi->s_imap[0]->b_data); | |
255 | minix_set_bit(0,sbi->s_zmap[0]->b_data); | |
256 | ||
257 | /* Apparently minix can create filesystems that allocate more blocks for | |
258 | * the bitmaps than needed. We simply ignore that, but verify it didn't | |
259 | * create one with not enough blocks and bail out if so. | |
260 | */ | |
261 | block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); | |
262 | if (sbi->s_imap_blocks < block) { | |
263 | printk("MINIX-fs: file system does not have enough " | |
264 | "imap blocks allocated. Refusing to mount\n"); | |
265 | goto out_no_bitmap; | |
266 | } | |
267 | ||
268 | block = minix_blocks_needed( | |
269 | (sbi->s_nzones - (sbi->s_firstdatazone + 1)), | |
270 | s->s_blocksize); | |
271 | if (sbi->s_zmap_blocks < block) { | |
272 | printk("MINIX-fs: file system does not have enough " | |
273 | "zmap blocks allocated. Refusing to mount.\n"); | |
274 | goto out_no_bitmap; | |
275 | } | |
276 | ||
277 | /* set up enough so that it can read an inode */ | |
278 | s->s_op = &minix_sops; | |
279 | root_inode = minix_iget(s, MINIX_ROOT_INO); | |
280 | if (IS_ERR(root_inode)) { | |
281 | ret = PTR_ERR(root_inode); | |
282 | goto out_no_root; | |
283 | } | |
284 | ||
285 | ret = -ENOMEM; | |
286 | s->s_root = d_make_root(root_inode); | |
287 | if (!s->s_root) | |
288 | goto out_no_root; | |
289 | ||
290 | if (!(s->s_flags & MS_RDONLY)) { | |
291 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ | |
292 | ms->s_state &= ~MINIX_VALID_FS; | |
293 | mark_buffer_dirty(bh); | |
294 | } | |
295 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
296 | printk("MINIX-fs: mounting unchecked file system, " | |
297 | "running fsck is recommended\n"); | |
298 | else if (sbi->s_mount_state & MINIX_ERROR_FS) | |
299 | printk("MINIX-fs: mounting file system with errors, " | |
300 | "running fsck is recommended\n"); | |
301 | ||
302 | return 0; | |
303 | ||
304 | out_no_root: | |
305 | if (!silent) | |
306 | printk("MINIX-fs: get root inode failed\n"); | |
307 | goto out_freemap; | |
308 | ||
309 | out_no_bitmap: | |
310 | printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); | |
311 | out_freemap: | |
312 | for (i = 0; i < sbi->s_imap_blocks; i++) | |
313 | brelse(sbi->s_imap[i]); | |
314 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
315 | brelse(sbi->s_zmap[i]); | |
316 | kfree(sbi->s_imap); | |
317 | goto out_release; | |
318 | ||
319 | out_no_map: | |
320 | ret = -ENOMEM; | |
321 | if (!silent) | |
322 | printk("MINIX-fs: can't allocate map\n"); | |
323 | goto out_release; | |
324 | ||
325 | out_illegal_sb: | |
326 | if (!silent) | |
327 | printk("MINIX-fs: bad superblock\n"); | |
328 | goto out_release; | |
329 | ||
330 | out_no_fs: | |
331 | if (!silent) | |
332 | printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " | |
333 | "on device %s.\n", s->s_id); | |
334 | out_release: | |
335 | brelse(bh); | |
336 | goto out; | |
337 | ||
338 | out_bad_hblock: | |
339 | printk("MINIX-fs: blocksize too small for device\n"); | |
340 | goto out; | |
341 | ||
342 | out_bad_sb: | |
343 | printk("MINIX-fs: unable to read superblock\n"); | |
344 | out: | |
345 | s->s_fs_info = NULL; | |
346 | kfree(sbi); | |
347 | return ret; | |
348 | } | |
349 | ||
350 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) | |
351 | { | |
352 | struct super_block *sb = dentry->d_sb; | |
353 | struct minix_sb_info *sbi = minix_sb(sb); | |
354 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
355 | buf->f_type = sb->s_magic; | |
356 | buf->f_bsize = sb->s_blocksize; | |
357 | buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; | |
358 | buf->f_bfree = minix_count_free_blocks(sb); | |
359 | buf->f_bavail = buf->f_bfree; | |
360 | buf->f_files = sbi->s_ninodes; | |
361 | buf->f_ffree = minix_count_free_inodes(sb); | |
362 | buf->f_namelen = sbi->s_namelen; | |
363 | buf->f_fsid.val[0] = (u32)id; | |
364 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | static int minix_get_block(struct inode *inode, sector_t block, | |
370 | struct buffer_head *bh_result, int create) | |
371 | { | |
372 | if (INODE_VERSION(inode) == MINIX_V1) | |
373 | return V1_minix_get_block(inode, block, bh_result, create); | |
374 | else | |
375 | return V2_minix_get_block(inode, block, bh_result, create); | |
376 | } | |
377 | ||
378 | static int minix_writepage(struct page *page, struct writeback_control *wbc) | |
379 | { | |
380 | return block_write_full_page(page, minix_get_block, wbc); | |
381 | } | |
382 | ||
383 | static int minix_readpage(struct file *file, struct page *page) | |
384 | { | |
385 | return block_read_full_page(page,minix_get_block); | |
386 | } | |
387 | ||
388 | int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) | |
389 | { | |
390 | return __block_write_begin(page, pos, len, minix_get_block); | |
391 | } | |
392 | ||
393 | static int minix_write_begin(struct file *file, struct address_space *mapping, | |
394 | loff_t pos, unsigned len, unsigned flags, | |
395 | struct page **pagep, void **fsdata) | |
396 | { | |
397 | int ret; | |
398 | ||
399 | ret = block_write_begin(mapping, pos, len, flags, pagep, | |
400 | minix_get_block); | |
401 | if (unlikely(ret)) { | |
402 | loff_t isize = mapping->host->i_size; | |
403 | if (pos + len > isize) | |
404 | vmtruncate(mapping->host, isize); | |
405 | } | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
410 | static sector_t minix_bmap(struct address_space *mapping, sector_t block) | |
411 | { | |
412 | return generic_block_bmap(mapping,block,minix_get_block); | |
413 | } | |
414 | ||
415 | static const struct address_space_operations minix_aops = { | |
416 | .readpage = minix_readpage, | |
417 | .writepage = minix_writepage, | |
418 | .write_begin = minix_write_begin, | |
419 | .write_end = generic_write_end, | |
420 | .bmap = minix_bmap | |
421 | }; | |
422 | ||
423 | static const struct inode_operations minix_symlink_inode_operations = { | |
424 | .readlink = generic_readlink, | |
425 | .follow_link = page_follow_link_light, | |
426 | .put_link = page_put_link, | |
427 | .getattr = minix_getattr, | |
428 | }; | |
429 | ||
430 | void minix_set_inode(struct inode *inode, dev_t rdev) | |
431 | { | |
432 | if (S_ISREG(inode->i_mode)) { | |
433 | inode->i_op = &minix_file_inode_operations; | |
434 | inode->i_fop = &minix_file_operations; | |
435 | inode->i_mapping->a_ops = &minix_aops; | |
436 | } else if (S_ISDIR(inode->i_mode)) { | |
437 | inode->i_op = &minix_dir_inode_operations; | |
438 | inode->i_fop = &minix_dir_operations; | |
439 | inode->i_mapping->a_ops = &minix_aops; | |
440 | } else if (S_ISLNK(inode->i_mode)) { | |
441 | inode->i_op = &minix_symlink_inode_operations; | |
442 | inode->i_mapping->a_ops = &minix_aops; | |
443 | } else | |
444 | init_special_inode(inode, inode->i_mode, rdev); | |
445 | } | |
446 | ||
447 | /* | |
448 | * The minix V1 function to read an inode. | |
449 | */ | |
450 | static struct inode *V1_minix_iget(struct inode *inode) | |
451 | { | |
452 | struct buffer_head * bh; | |
453 | struct minix_inode * raw_inode; | |
454 | struct minix_inode_info *minix_inode = minix_i(inode); | |
455 | int i; | |
456 | ||
457 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
458 | if (!raw_inode) { | |
459 | iget_failed(inode); | |
460 | return ERR_PTR(-EIO); | |
461 | } | |
462 | inode->i_mode = raw_inode->i_mode; | |
463 | inode->i_uid = (uid_t)raw_inode->i_uid; | |
464 | inode->i_gid = (gid_t)raw_inode->i_gid; | |
465 | set_nlink(inode, raw_inode->i_nlinks); | |
466 | inode->i_size = raw_inode->i_size; | |
467 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; | |
468 | inode->i_mtime.tv_nsec = 0; | |
469 | inode->i_atime.tv_nsec = 0; | |
470 | inode->i_ctime.tv_nsec = 0; | |
471 | inode->i_blocks = 0; | |
472 | for (i = 0; i < 9; i++) | |
473 | minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; | |
474 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
475 | brelse(bh); | |
476 | unlock_new_inode(inode); | |
477 | return inode; | |
478 | } | |
479 | ||
480 | /* | |
481 | * The minix V2 function to read an inode. | |
482 | */ | |
483 | static struct inode *V2_minix_iget(struct inode *inode) | |
484 | { | |
485 | struct buffer_head * bh; | |
486 | struct minix2_inode * raw_inode; | |
487 | struct minix_inode_info *minix_inode = minix_i(inode); | |
488 | int i; | |
489 | ||
490 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
491 | if (!raw_inode) { | |
492 | iget_failed(inode); | |
493 | return ERR_PTR(-EIO); | |
494 | } | |
495 | inode->i_mode = raw_inode->i_mode; | |
496 | inode->i_uid = (uid_t)raw_inode->i_uid; | |
497 | inode->i_gid = (gid_t)raw_inode->i_gid; | |
498 | set_nlink(inode, raw_inode->i_nlinks); | |
499 | inode->i_size = raw_inode->i_size; | |
500 | inode->i_mtime.tv_sec = raw_inode->i_mtime; | |
501 | inode->i_atime.tv_sec = raw_inode->i_atime; | |
502 | inode->i_ctime.tv_sec = raw_inode->i_ctime; | |
503 | inode->i_mtime.tv_nsec = 0; | |
504 | inode->i_atime.tv_nsec = 0; | |
505 | inode->i_ctime.tv_nsec = 0; | |
506 | inode->i_blocks = 0; | |
507 | for (i = 0; i < 10; i++) | |
508 | minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; | |
509 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
510 | brelse(bh); | |
511 | unlock_new_inode(inode); | |
512 | return inode; | |
513 | } | |
514 | ||
515 | /* | |
516 | * The global function to read an inode. | |
517 | */ | |
518 | struct inode *minix_iget(struct super_block *sb, unsigned long ino) | |
519 | { | |
520 | struct inode *inode; | |
521 | ||
522 | inode = iget_locked(sb, ino); | |
523 | if (!inode) | |
524 | return ERR_PTR(-ENOMEM); | |
525 | if (!(inode->i_state & I_NEW)) | |
526 | return inode; | |
527 | ||
528 | if (INODE_VERSION(inode) == MINIX_V1) | |
529 | return V1_minix_iget(inode); | |
530 | else | |
531 | return V2_minix_iget(inode); | |
532 | } | |
533 | ||
534 | /* | |
535 | * The minix V1 function to synchronize an inode. | |
536 | */ | |
537 | static struct buffer_head * V1_minix_update_inode(struct inode * inode) | |
538 | { | |
539 | struct buffer_head * bh; | |
540 | struct minix_inode * raw_inode; | |
541 | struct minix_inode_info *minix_inode = minix_i(inode); | |
542 | int i; | |
543 | ||
544 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
545 | if (!raw_inode) | |
546 | return NULL; | |
547 | raw_inode->i_mode = inode->i_mode; | |
548 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); | |
549 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); | |
550 | raw_inode->i_nlinks = inode->i_nlink; | |
551 | raw_inode->i_size = inode->i_size; | |
552 | raw_inode->i_time = inode->i_mtime.tv_sec; | |
553 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
554 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
555 | else for (i = 0; i < 9; i++) | |
556 | raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; | |
557 | mark_buffer_dirty(bh); | |
558 | return bh; | |
559 | } | |
560 | ||
561 | /* | |
562 | * The minix V2 function to synchronize an inode. | |
563 | */ | |
564 | static struct buffer_head * V2_minix_update_inode(struct inode * inode) | |
565 | { | |
566 | struct buffer_head * bh; | |
567 | struct minix2_inode * raw_inode; | |
568 | struct minix_inode_info *minix_inode = minix_i(inode); | |
569 | int i; | |
570 | ||
571 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
572 | if (!raw_inode) | |
573 | return NULL; | |
574 | raw_inode->i_mode = inode->i_mode; | |
575 | raw_inode->i_uid = fs_high2lowuid(inode->i_uid); | |
576 | raw_inode->i_gid = fs_high2lowgid(inode->i_gid); | |
577 | raw_inode->i_nlinks = inode->i_nlink; | |
578 | raw_inode->i_size = inode->i_size; | |
579 | raw_inode->i_mtime = inode->i_mtime.tv_sec; | |
580 | raw_inode->i_atime = inode->i_atime.tv_sec; | |
581 | raw_inode->i_ctime = inode->i_ctime.tv_sec; | |
582 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
583 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
584 | else for (i = 0; i < 10; i++) | |
585 | raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; | |
586 | mark_buffer_dirty(bh); | |
587 | return bh; | |
588 | } | |
589 | ||
590 | static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) | |
591 | { | |
592 | int err = 0; | |
593 | struct buffer_head *bh; | |
594 | ||
595 | if (INODE_VERSION(inode) == MINIX_V1) | |
596 | bh = V1_minix_update_inode(inode); | |
597 | else | |
598 | bh = V2_minix_update_inode(inode); | |
599 | if (!bh) | |
600 | return -EIO; | |
601 | if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { | |
602 | sync_dirty_buffer(bh); | |
603 | if (buffer_req(bh) && !buffer_uptodate(bh)) { | |
604 | printk("IO error syncing minix inode [%s:%08lx]\n", | |
605 | inode->i_sb->s_id, inode->i_ino); | |
606 | err = -EIO; | |
607 | } | |
608 | } | |
609 | brelse (bh); | |
610 | return err; | |
611 | } | |
612 | ||
613 | int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
614 | { | |
615 | struct super_block *sb = dentry->d_sb; | |
616 | generic_fillattr(dentry->d_inode, stat); | |
617 | if (INODE_VERSION(dentry->d_inode) == MINIX_V1) | |
618 | stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); | |
619 | else | |
620 | stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); | |
621 | stat->blksize = sb->s_blocksize; | |
622 | return 0; | |
623 | } | |
624 | ||
625 | /* | |
626 | * The function that is called for file truncation. | |
627 | */ | |
628 | void minix_truncate(struct inode * inode) | |
629 | { | |
630 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) | |
631 | return; | |
632 | if (INODE_VERSION(inode) == MINIX_V1) | |
633 | V1_minix_truncate(inode); | |
634 | else | |
635 | V2_minix_truncate(inode); | |
636 | } | |
637 | ||
638 | static struct dentry *minix_mount(struct file_system_type *fs_type, | |
639 | int flags, const char *dev_name, void *data) | |
640 | { | |
641 | return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); | |
642 | } | |
643 | ||
644 | static struct file_system_type minix_fs_type = { | |
645 | .owner = THIS_MODULE, | |
646 | .name = "minix", | |
647 | .mount = minix_mount, | |
648 | .kill_sb = kill_block_super, | |
649 | .fs_flags = FS_REQUIRES_DEV, | |
650 | }; | |
651 | ||
652 | static int __init init_minix_fs(void) | |
653 | { | |
654 | int err = init_inodecache(); | |
655 | if (err) | |
656 | goto out1; | |
657 | err = register_filesystem(&minix_fs_type); | |
658 | if (err) | |
659 | goto out; | |
660 | return 0; | |
661 | out: | |
662 | destroy_inodecache(); | |
663 | out1: | |
664 | return err; | |
665 | } | |
666 | ||
667 | static void __exit exit_minix_fs(void) | |
668 | { | |
669 | unregister_filesystem(&minix_fs_type); | |
670 | destroy_inodecache(); | |
671 | } | |
672 | ||
673 | module_init(init_minix_fs) | |
674 | module_exit(exit_minix_fs) | |
675 | MODULE_LICENSE("GPL"); | |
676 |