blob: ce532c2deda8dfd98becbd714bee63daf90ac24d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
20static void minix_read_inode(struct inode * inode);
21static int minix_write_inode(struct inode * inode, int wait);
David Howells726c3342006-06-23 02:02:58 -070022static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070023static int minix_remount (struct super_block * sb, int * flags, char * data);
24
25static void minix_delete_inode(struct inode *inode)
26{
Mark Fashehfef26652005-09-09 13:01:31 -070027 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 inode->i_size = 0;
29 minix_truncate(inode);
30 minix_free_inode(inode);
31}
32
33static 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
54static kmem_cache_t * minix_inode_cachep;
55
56static struct inode *minix_alloc_inode(struct super_block *sb)
57{
58 struct minix_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080059 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 if (!ei)
61 return NULL;
62 return &ei->vfs_inode;
63}
64
65static void minix_destroy_inode(struct inode *inode)
66{
67 kmem_cache_free(minix_inode_cachep, minix_i(inode));
68}
69
70static 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
79static int init_inodecache(void)
80{
81 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
82 sizeof(struct minix_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -080083 0, (SLAB_RECLAIM_ACCOUNT|
84 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 init_once, NULL);
86 if (minix_inode_cachep == NULL)
87 return -ENOMEM;
88 return 0;
89}
90
91static void destroy_inodecache(void)
92{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070093 kmem_cache_destroy(minix_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
96static 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
107static 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))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800129 printk("MINIX-fs warning: remounting unchecked fs, "
130 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800132 printk("MINIX-fs warning: remounting fs with errors, "
133 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
135 return 0;
136}
137
138static 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
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700147 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 if (!sbi)
149 return -ENOMEM;
150 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700152 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
153 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 if (!sb_set_blocksize(s, BLOCK_SIZE))
156 goto out_bad_hblock;
157
158 if (!(bh = sb_bread(s, 1)))
159 goto out_bad_sb;
160
161 ms = (struct minix_super_block *) bh->b_data;
162 sbi->s_ms = ms;
163 sbi->s_sbh = bh;
164 sbi->s_mount_state = ms->s_state;
165 sbi->s_ninodes = ms->s_ninodes;
166 sbi->s_nzones = ms->s_nzones;
167 sbi->s_imap_blocks = ms->s_imap_blocks;
168 sbi->s_zmap_blocks = ms->s_zmap_blocks;
169 sbi->s_firstdatazone = ms->s_firstdatazone;
170 sbi->s_log_zone_size = ms->s_log_zone_size;
171 sbi->s_max_size = ms->s_max_size;
172 s->s_magic = ms->s_magic;
173 if (s->s_magic == MINIX_SUPER_MAGIC) {
174 sbi->s_version = MINIX_V1;
175 sbi->s_dirsize = 16;
176 sbi->s_namelen = 14;
177 sbi->s_link_max = MINIX_LINK_MAX;
178 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
179 sbi->s_version = MINIX_V1;
180 sbi->s_dirsize = 32;
181 sbi->s_namelen = 30;
182 sbi->s_link_max = MINIX_LINK_MAX;
183 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
184 sbi->s_version = MINIX_V2;
185 sbi->s_nzones = ms->s_zones;
186 sbi->s_dirsize = 16;
187 sbi->s_namelen = 14;
188 sbi->s_link_max = MINIX2_LINK_MAX;
189 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
190 sbi->s_version = MINIX_V2;
191 sbi->s_nzones = ms->s_zones;
192 sbi->s_dirsize = 32;
193 sbi->s_namelen = 30;
194 sbi->s_link_max = MINIX2_LINK_MAX;
195 } else
196 goto out_no_fs;
197
198 /*
199 * Allocate the buffer map to keep the superblock small.
200 */
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700201 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
202 goto out_illegal_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700204 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (!map)
206 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 sbi->s_imap = &map[0];
208 sbi->s_zmap = &map[sbi->s_imap_blocks];
209
210 block=2;
211 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
212 if (!(sbi->s_imap[i]=sb_bread(s, block)))
213 goto out_no_bitmap;
214 block++;
215 }
216 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
217 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
218 goto out_no_bitmap;
219 block++;
220 }
221
222 minix_set_bit(0,sbi->s_imap[0]->b_data);
223 minix_set_bit(0,sbi->s_zmap[0]->b_data);
224
225 /* set up enough so that it can read an inode */
226 s->s_op = &minix_sops;
227 root_inode = iget(s, MINIX_ROOT_INO);
228 if (!root_inode || is_bad_inode(root_inode))
229 goto out_no_root;
230
231 s->s_root = d_alloc_root(root_inode);
232 if (!s->s_root)
233 goto out_iput;
234
235 if (!NO_TRUNCATE)
236 s->s_root->d_op = &minix_dentry_operations;
237
238 if (!(s->s_flags & MS_RDONLY)) {
239 ms->s_state &= ~MINIX_VALID_FS;
240 mark_buffer_dirty(bh);
241 }
242 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800243 printk("MINIX-fs: mounting unchecked file system, "
244 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 else if (sbi->s_mount_state & MINIX_ERROR_FS)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800246 printk("MINIX-fs: mounting file system with errors, "
247 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 return 0;
249
250out_iput:
251 iput(root_inode);
252 goto out_freemap;
253
254out_no_root:
255 if (!silent)
256 printk("MINIX-fs: get root inode failed\n");
257 goto out_freemap;
258
259out_no_bitmap:
260 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700261out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 for (i = 0; i < sbi->s_imap_blocks; i++)
263 brelse(sbi->s_imap[i]);
264 for (i = 0; i < sbi->s_zmap_blocks; i++)
265 brelse(sbi->s_zmap[i]);
266 kfree(sbi->s_imap);
267 goto out_release;
268
269out_no_map:
270 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800271 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 goto out_release;
273
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700274out_illegal_sb:
275 if (!silent)
276 printk("MINIX-fs: bad superblock\n");
277 goto out_release;
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279out_no_fs:
280 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800281 printk("VFS: Can't find a Minix or Minix V2 filesystem "
282 "on device %s\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700283out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 brelse(bh);
285 goto out;
286
287out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800288 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 goto out;
290
291out_bad_sb:
292 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700293out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 s->s_fs_info = NULL;
295 kfree(sbi);
296 return -EINVAL;
297}
298
David Howells726c3342006-06-23 02:02:58 -0700299static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
David Howells726c3342006-06-23 02:02:58 -0700301 struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
302 buf->f_type = dentry->d_sb->s_magic;
303 buf->f_bsize = dentry->d_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
305 buf->f_bfree = minix_count_free_blocks(sbi);
306 buf->f_bavail = buf->f_bfree;
307 buf->f_files = sbi->s_ninodes;
308 buf->f_ffree = minix_count_free_inodes(sbi);
309 buf->f_namelen = sbi->s_namelen;
310 return 0;
311}
312
313static int minix_get_block(struct inode *inode, sector_t block,
314 struct buffer_head *bh_result, int create)
315{
316 if (INODE_VERSION(inode) == MINIX_V1)
317 return V1_minix_get_block(inode, block, bh_result, create);
318 else
319 return V2_minix_get_block(inode, block, bh_result, create);
320}
321
322static int minix_writepage(struct page *page, struct writeback_control *wbc)
323{
324 return block_write_full_page(page, minix_get_block, wbc);
325}
326static int minix_readpage(struct file *file, struct page *page)
327{
328 return block_read_full_page(page,minix_get_block);
329}
330static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
331{
332 return block_prepare_write(page,from,to,minix_get_block);
333}
334static sector_t minix_bmap(struct address_space *mapping, sector_t block)
335{
336 return generic_block_bmap(mapping,block,minix_get_block);
337}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700338static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 .readpage = minix_readpage,
340 .writepage = minix_writepage,
341 .sync_page = block_sync_page,
342 .prepare_write = minix_prepare_write,
343 .commit_write = generic_commit_write,
344 .bmap = minix_bmap
345};
346
347static struct inode_operations minix_symlink_inode_operations = {
348 .readlink = generic_readlink,
349 .follow_link = page_follow_link_light,
350 .put_link = page_put_link,
351 .getattr = minix_getattr,
352};
353
354void minix_set_inode(struct inode *inode, dev_t rdev)
355{
356 if (S_ISREG(inode->i_mode)) {
357 inode->i_op = &minix_file_inode_operations;
358 inode->i_fop = &minix_file_operations;
359 inode->i_mapping->a_ops = &minix_aops;
360 } else if (S_ISDIR(inode->i_mode)) {
361 inode->i_op = &minix_dir_inode_operations;
362 inode->i_fop = &minix_dir_operations;
363 inode->i_mapping->a_ops = &minix_aops;
364 } else if (S_ISLNK(inode->i_mode)) {
365 inode->i_op = &minix_symlink_inode_operations;
366 inode->i_mapping->a_ops = &minix_aops;
367 } else
368 init_special_inode(inode, inode->i_mode, rdev);
369}
370
371/*
372 * The minix V1 function to read an inode.
373 */
374static void V1_minix_read_inode(struct inode * inode)
375{
376 struct buffer_head * bh;
377 struct minix_inode * raw_inode;
378 struct minix_inode_info *minix_inode = minix_i(inode);
379 int i;
380
381 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
382 if (!raw_inode) {
383 make_bad_inode(inode);
384 return;
385 }
386 inode->i_mode = raw_inode->i_mode;
387 inode->i_uid = (uid_t)raw_inode->i_uid;
388 inode->i_gid = (gid_t)raw_inode->i_gid;
389 inode->i_nlink = raw_inode->i_nlinks;
390 inode->i_size = raw_inode->i_size;
391 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
392 inode->i_mtime.tv_nsec = 0;
393 inode->i_atime.tv_nsec = 0;
394 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700395 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 for (i = 0; i < 9; i++)
397 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
398 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
399 brelse(bh);
400}
401
402/*
403 * The minix V2 function to read an inode.
404 */
405static void V2_minix_read_inode(struct inode * inode)
406{
407 struct buffer_head * bh;
408 struct minix2_inode * raw_inode;
409 struct minix_inode_info *minix_inode = minix_i(inode);
410 int i;
411
412 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
413 if (!raw_inode) {
414 make_bad_inode(inode);
415 return;
416 }
417 inode->i_mode = raw_inode->i_mode;
418 inode->i_uid = (uid_t)raw_inode->i_uid;
419 inode->i_gid = (gid_t)raw_inode->i_gid;
420 inode->i_nlink = raw_inode->i_nlinks;
421 inode->i_size = raw_inode->i_size;
422 inode->i_mtime.tv_sec = raw_inode->i_mtime;
423 inode->i_atime.tv_sec = raw_inode->i_atime;
424 inode->i_ctime.tv_sec = raw_inode->i_ctime;
425 inode->i_mtime.tv_nsec = 0;
426 inode->i_atime.tv_nsec = 0;
427 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700428 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 for (i = 0; i < 10; i++)
430 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
431 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
432 brelse(bh);
433}
434
435/*
436 * The global function to read an inode.
437 */
438static void minix_read_inode(struct inode * inode)
439{
440 if (INODE_VERSION(inode) == MINIX_V1)
441 V1_minix_read_inode(inode);
442 else
443 V2_minix_read_inode(inode);
444}
445
446/*
447 * The minix V1 function to synchronize an inode.
448 */
449static struct buffer_head * V1_minix_update_inode(struct inode * inode)
450{
451 struct buffer_head * bh;
452 struct minix_inode * raw_inode;
453 struct minix_inode_info *minix_inode = minix_i(inode);
454 int i;
455
456 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
457 if (!raw_inode)
458 return NULL;
459 raw_inode->i_mode = inode->i_mode;
460 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
461 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
462 raw_inode->i_nlinks = inode->i_nlink;
463 raw_inode->i_size = inode->i_size;
464 raw_inode->i_time = inode->i_mtime.tv_sec;
465 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
466 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
467 else for (i = 0; i < 9; i++)
468 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
469 mark_buffer_dirty(bh);
470 return bh;
471}
472
473/*
474 * The minix V2 function to synchronize an inode.
475 */
476static struct buffer_head * V2_minix_update_inode(struct inode * inode)
477{
478 struct buffer_head * bh;
479 struct minix2_inode * raw_inode;
480 struct minix_inode_info *minix_inode = minix_i(inode);
481 int i;
482
483 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
484 if (!raw_inode)
485 return NULL;
486 raw_inode->i_mode = inode->i_mode;
487 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
488 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
489 raw_inode->i_nlinks = inode->i_nlink;
490 raw_inode->i_size = inode->i_size;
491 raw_inode->i_mtime = inode->i_mtime.tv_sec;
492 raw_inode->i_atime = inode->i_atime.tv_sec;
493 raw_inode->i_ctime = inode->i_ctime.tv_sec;
494 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
495 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
496 else for (i = 0; i < 10; i++)
497 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
498 mark_buffer_dirty(bh);
499 return bh;
500}
501
502static struct buffer_head *minix_update_inode(struct inode *inode)
503{
504 if (INODE_VERSION(inode) == MINIX_V1)
505 return V1_minix_update_inode(inode);
506 else
507 return V2_minix_update_inode(inode);
508}
509
510static int minix_write_inode(struct inode * inode, int wait)
511{
512 brelse(minix_update_inode(inode));
513 return 0;
514}
515
516int minix_sync_inode(struct inode * inode)
517{
518 int err = 0;
519 struct buffer_head *bh;
520
521 bh = minix_update_inode(inode);
522 if (bh && buffer_dirty(bh))
523 {
524 sync_dirty_buffer(bh);
525 if (buffer_req(bh) && !buffer_uptodate(bh))
526 {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800527 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 inode->i_sb->s_id, inode->i_ino);
529 err = -1;
530 }
531 }
532 else if (!bh)
533 err = -1;
534 brelse (bh);
535 return err;
536}
537
538int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
539{
540 generic_fillattr(dentry->d_inode, stat);
541 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
542 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size);
543 else
544 stat->blocks = (BLOCK_SIZE / 512) * V2_minix_blocks(stat->size);
545 stat->blksize = BLOCK_SIZE;
546 return 0;
547}
548
549/*
550 * The function that is called for file truncation.
551 */
552void minix_truncate(struct inode * inode)
553{
554 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
555 return;
556 if (INODE_VERSION(inode) == MINIX_V1)
557 V1_minix_truncate(inode);
558 else
559 V2_minix_truncate(inode);
560}
561
David Howells454e2392006-06-23 02:02:57 -0700562static int minix_get_sb(struct file_system_type *fs_type,
563 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564{
David Howells454e2392006-06-23 02:02:57 -0700565 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
566 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
569static struct file_system_type minix_fs_type = {
570 .owner = THIS_MODULE,
571 .name = "minix",
572 .get_sb = minix_get_sb,
573 .kill_sb = kill_block_super,
574 .fs_flags = FS_REQUIRES_DEV,
575};
576
577static int __init init_minix_fs(void)
578{
579 int err = init_inodecache();
580 if (err)
581 goto out1;
582 err = register_filesystem(&minix_fs_type);
583 if (err)
584 goto out;
585 return 0;
586out:
587 destroy_inodecache();
588out1:
589 return err;
590}
591
592static void __exit exit_minix_fs(void)
593{
594 unregister_filesystem(&minix_fs_type);
595 destroy_inodecache();
596}
597
598module_init(init_minix_fs)
599module_exit(exit_minix_fs)
600MODULE_LICENSE("GPL");
601