blob: be4044614ac83374672d90cacb406aee004375ee [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
Andries Brouwer939b00d2007-02-12 00:52:49 -080010 * Updated to filesystem version 3 by Daniel Aragones
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
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
21static void minix_read_inode(struct inode * inode);
22static int minix_write_inode(struct inode * inode, int wait);
David Howells726c3342006-06-23 02:02:58 -070023static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070024static int minix_remount (struct super_block * sb, int * flags, char * data);
25
26static void minix_delete_inode(struct inode *inode)
27{
Mark Fashehfef26652005-09-09 13:01:31 -070028 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 inode->i_size = 0;
30 minix_truncate(inode);
31 minix_free_inode(inode);
32}
33
34static 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)) {
Andries Brouwer939b00d2007-02-12 00:52:49 -080040 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
41 sbi->s_ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 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
Christoph Lametere18b8902006-12-06 20:33:20 -080056static struct kmem_cache * minix_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58static struct inode *minix_alloc_inode(struct super_block *sb)
59{
60 struct minix_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080061 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 if (!ei)
63 return NULL;
64 return &ei->vfs_inode;
65}
66
67static void minix_destroy_inode(struct inode *inode)
68{
69 kmem_cache_free(minix_inode_cachep, minix_i(inode));
70}
71
Christoph Lametere18b8902006-12-06 20:33:20 -080072static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
74 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
75
Christoph Lametera35afb82007-05-16 22:10:57 -070076 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
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
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080096static const struct super_operations minix_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 .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. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800120 if (sbi->s_version != MINIX_V3)
121 ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 mark_buffer_dirty(sbi->s_sbh);
123 } else {
124 /* Mount a partition which is read-only, read-write. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800125 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 mark_buffer_dirty(sbi->s_sbh);
132
133 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800134 printk("MINIX-fs warning: remounting unchecked fs, "
135 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800137 printk("MINIX-fs warning: remounting fs with errors, "
138 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 }
140 return 0;
141}
142
143static 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;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800148 struct minix3_super_block *m3s = NULL;
149 unsigned long i, block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 struct inode *root_inode;
151 struct minix_sb_info *sbi;
152
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700153 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 if (!sbi)
155 return -ENOMEM;
156 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700158 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
159 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
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;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800201 } 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 } else
218 goto out_no_fs;
219
220 /*
221 * Allocate the buffer map to keep the superblock small.
222 */
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700223 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
224 goto out_illegal_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700226 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 if (!map)
228 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 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)) {
Andries Brouwer939b00d2007-02-12 00:52:49 -0800261 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
262 ms->s_state &= ~MINIX_VALID_FS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 mark_buffer_dirty(bh);
264 }
265 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800266 printk("MINIX-fs: mounting unchecked file system, "
267 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 else if (sbi->s_mount_state & MINIX_ERROR_FS)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800269 printk("MINIX-fs: mounting file system with errors, "
270 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return 0;
272
273out_iput:
274 iput(root_inode);
275 goto out_freemap;
276
277out_no_root:
278 if (!silent)
279 printk("MINIX-fs: get root inode failed\n");
280 goto out_freemap;
281
282out_no_bitmap:
283 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700284out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 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
292out_no_map:
293 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800294 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 goto out_release;
296
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700297out_illegal_sb:
298 if (!silent)
299 printk("MINIX-fs: bad superblock\n");
300 goto out_release;
301
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302out_no_fs:
303 if (!silent)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800304 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
305 "on device %s.\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700306out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 brelse(bh);
308 goto out;
309
310out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800311 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 goto out;
313
314out_bad_sb:
315 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700316out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 s->s_fs_info = NULL;
318 kfree(sbi);
319 return -EINVAL;
320}
321
David Howells726c3342006-06-23 02:02:58 -0700322static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
David Howells726c3342006-06-23 02:02:58 -0700324 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 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
336static 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
345static int minix_writepage(struct page *page, struct writeback_control *wbc)
346{
347 return block_write_full_page(page, minix_get_block, wbc);
348}
349static int minix_readpage(struct file *file, struct page *page)
350{
351 return block_read_full_page(page,minix_get_block);
352}
353static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
354{
355 return block_prepare_write(page,from,to,minix_get_block);
356}
357static sector_t minix_bmap(struct address_space *mapping, sector_t block)
358{
359 return generic_block_bmap(mapping,block,minix_get_block);
360}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700361static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 .readpage = minix_readpage,
363 .writepage = minix_writepage,
364 .sync_page = block_sync_page,
365 .prepare_write = minix_prepare_write,
366 .commit_write = generic_commit_write,
367 .bmap = minix_bmap
368};
369
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800370static const struct inode_operations minix_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 .readlink = generic_readlink,
372 .follow_link = page_follow_link_light,
373 .put_link = page_put_link,
374 .getattr = minix_getattr,
375};
376
377void minix_set_inode(struct inode *inode, dev_t rdev)
378{
379 if (S_ISREG(inode->i_mode)) {
380 inode->i_op = &minix_file_inode_operations;
381 inode->i_fop = &minix_file_operations;
382 inode->i_mapping->a_ops = &minix_aops;
383 } else if (S_ISDIR(inode->i_mode)) {
384 inode->i_op = &minix_dir_inode_operations;
385 inode->i_fop = &minix_dir_operations;
386 inode->i_mapping->a_ops = &minix_aops;
387 } else if (S_ISLNK(inode->i_mode)) {
388 inode->i_op = &minix_symlink_inode_operations;
389 inode->i_mapping->a_ops = &minix_aops;
390 } else
391 init_special_inode(inode, inode->i_mode, rdev);
392}
393
394/*
395 * The minix V1 function to read an inode.
396 */
397static void V1_minix_read_inode(struct inode * inode)
398{
399 struct buffer_head * bh;
400 struct minix_inode * raw_inode;
401 struct minix_inode_info *minix_inode = minix_i(inode);
402 int i;
403
404 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
405 if (!raw_inode) {
406 make_bad_inode(inode);
407 return;
408 }
409 inode->i_mode = raw_inode->i_mode;
410 inode->i_uid = (uid_t)raw_inode->i_uid;
411 inode->i_gid = (gid_t)raw_inode->i_gid;
412 inode->i_nlink = raw_inode->i_nlinks;
413 inode->i_size = raw_inode->i_size;
414 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
415 inode->i_mtime.tv_nsec = 0;
416 inode->i_atime.tv_nsec = 0;
417 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700418 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 for (i = 0; i < 9; i++)
420 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
421 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
422 brelse(bh);
423}
424
425/*
426 * The minix V2 function to read an inode.
427 */
428static void V2_minix_read_inode(struct inode * inode)
429{
430 struct buffer_head * bh;
431 struct minix2_inode * raw_inode;
432 struct minix_inode_info *minix_inode = minix_i(inode);
433 int i;
434
435 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
436 if (!raw_inode) {
437 make_bad_inode(inode);
438 return;
439 }
440 inode->i_mode = raw_inode->i_mode;
441 inode->i_uid = (uid_t)raw_inode->i_uid;
442 inode->i_gid = (gid_t)raw_inode->i_gid;
443 inode->i_nlink = raw_inode->i_nlinks;
444 inode->i_size = raw_inode->i_size;
445 inode->i_mtime.tv_sec = raw_inode->i_mtime;
446 inode->i_atime.tv_sec = raw_inode->i_atime;
447 inode->i_ctime.tv_sec = raw_inode->i_ctime;
448 inode->i_mtime.tv_nsec = 0;
449 inode->i_atime.tv_nsec = 0;
450 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700451 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 for (i = 0; i < 10; i++)
453 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
454 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
455 brelse(bh);
456}
457
458/*
459 * The global function to read an inode.
460 */
461static void minix_read_inode(struct inode * inode)
462{
463 if (INODE_VERSION(inode) == MINIX_V1)
464 V1_minix_read_inode(inode);
465 else
466 V2_minix_read_inode(inode);
467}
468
469/*
470 * The minix V1 function to synchronize an inode.
471 */
472static struct buffer_head * V1_minix_update_inode(struct inode * inode)
473{
474 struct buffer_head * bh;
475 struct minix_inode * raw_inode;
476 struct minix_inode_info *minix_inode = minix_i(inode);
477 int i;
478
479 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
480 if (!raw_inode)
481 return NULL;
482 raw_inode->i_mode = inode->i_mode;
483 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
484 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
485 raw_inode->i_nlinks = inode->i_nlink;
486 raw_inode->i_size = inode->i_size;
487 raw_inode->i_time = inode->i_mtime.tv_sec;
488 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
489 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
490 else for (i = 0; i < 9; i++)
491 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
492 mark_buffer_dirty(bh);
493 return bh;
494}
495
496/*
497 * The minix V2 function to synchronize an inode.
498 */
499static struct buffer_head * V2_minix_update_inode(struct inode * inode)
500{
501 struct buffer_head * bh;
502 struct minix2_inode * raw_inode;
503 struct minix_inode_info *minix_inode = minix_i(inode);
504 int i;
505
506 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
507 if (!raw_inode)
508 return NULL;
509 raw_inode->i_mode = inode->i_mode;
510 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
511 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
512 raw_inode->i_nlinks = inode->i_nlink;
513 raw_inode->i_size = inode->i_size;
514 raw_inode->i_mtime = inode->i_mtime.tv_sec;
515 raw_inode->i_atime = inode->i_atime.tv_sec;
516 raw_inode->i_ctime = inode->i_ctime.tv_sec;
517 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
518 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
519 else for (i = 0; i < 10; i++)
520 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
521 mark_buffer_dirty(bh);
522 return bh;
523}
524
525static struct buffer_head *minix_update_inode(struct inode *inode)
526{
527 if (INODE_VERSION(inode) == MINIX_V1)
528 return V1_minix_update_inode(inode);
529 else
530 return V2_minix_update_inode(inode);
531}
532
533static int minix_write_inode(struct inode * inode, int wait)
534{
535 brelse(minix_update_inode(inode));
536 return 0;
537}
538
539int minix_sync_inode(struct inode * inode)
540{
541 int err = 0;
542 struct buffer_head *bh;
543
544 bh = minix_update_inode(inode);
545 if (bh && buffer_dirty(bh))
546 {
547 sync_dirty_buffer(bh);
548 if (buffer_req(bh) && !buffer_uptodate(bh))
549 {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800550 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 inode->i_sb->s_id, inode->i_ino);
552 err = -1;
553 }
554 }
555 else if (!bh)
556 err = -1;
557 brelse (bh);
558 return err;
559}
560
561int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
562{
Andries Brouwer939b00d2007-02-12 00:52:49 -0800563 struct inode *dir = dentry->d_parent->d_inode;
564 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 generic_fillattr(dentry->d_inode, stat);
566 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800567 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 else
Andries Brouwer939b00d2007-02-12 00:52:49 -0800569 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
570 stat->blksize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return 0;
572}
573
574/*
575 * The function that is called for file truncation.
576 */
577void minix_truncate(struct inode * inode)
578{
579 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
580 return;
581 if (INODE_VERSION(inode) == MINIX_V1)
582 V1_minix_truncate(inode);
583 else
584 V2_minix_truncate(inode);
585}
586
David Howells454e2392006-06-23 02:02:57 -0700587static int minix_get_sb(struct file_system_type *fs_type,
588 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
David Howells454e2392006-06-23 02:02:57 -0700590 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
591 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592}
593
594static struct file_system_type minix_fs_type = {
595 .owner = THIS_MODULE,
596 .name = "minix",
597 .get_sb = minix_get_sb,
598 .kill_sb = kill_block_super,
599 .fs_flags = FS_REQUIRES_DEV,
600};
601
602static int __init init_minix_fs(void)
603{
604 int err = init_inodecache();
605 if (err)
606 goto out1;
607 err = register_filesystem(&minix_fs_type);
608 if (err)
609 goto out;
610 return 0;
611out:
612 destroy_inodecache();
613out1:
614 return err;
615}
616
617static void __exit exit_minix_fs(void)
618{
619 unregister_filesystem(&minix_fs_type);
620 destroy_inodecache();
621}
622
623module_init(init_minix_fs)
624module_exit(exit_minix_fs)
625MODULE_LICENSE("GPL");
626