blob: 92e383af3709c89dc14531a05856684ff809d9cf [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
76 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
77 SLAB_CTOR_CONSTRUCTOR)
78 inode_init_once(&ei->vfs_inode);
79}
80
81static int init_inodecache(void)
82{
83 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
84 sizeof(struct minix_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -080085 0, (SLAB_RECLAIM_ACCOUNT|
86 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 init_once, NULL);
88 if (minix_inode_cachep == NULL)
89 return -ENOMEM;
90 return 0;
91}
92
93static void destroy_inodecache(void)
94{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070095 kmem_cache_destroy(minix_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080098static const struct super_operations minix_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 .alloc_inode = minix_alloc_inode,
100 .destroy_inode = minix_destroy_inode,
101 .read_inode = minix_read_inode,
102 .write_inode = minix_write_inode,
103 .delete_inode = minix_delete_inode,
104 .put_super = minix_put_super,
105 .statfs = minix_statfs,
106 .remount_fs = minix_remount,
107};
108
109static int minix_remount (struct super_block * sb, int * flags, char * data)
110{
111 struct minix_sb_info * sbi = minix_sb(sb);
112 struct minix_super_block * ms;
113
114 ms = sbi->s_ms;
115 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
116 return 0;
117 if (*flags & MS_RDONLY) {
118 if (ms->s_state & MINIX_VALID_FS ||
119 !(sbi->s_mount_state & MINIX_VALID_FS))
120 return 0;
121 /* Mounting a rw partition read-only. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800122 if (sbi->s_version != MINIX_V3)
123 ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 mark_buffer_dirty(sbi->s_sbh);
125 } else {
126 /* Mount a partition which is read-only, read-write. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800127 if (sbi->s_version != MINIX_V3) {
128 sbi->s_mount_state = ms->s_state;
129 ms->s_state &= ~MINIX_VALID_FS;
130 } else {
131 sbi->s_mount_state = MINIX_VALID_FS;
132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 mark_buffer_dirty(sbi->s_sbh);
134
135 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800136 printk("MINIX-fs warning: remounting unchecked fs, "
137 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800139 printk("MINIX-fs warning: remounting fs with errors, "
140 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
142 return 0;
143}
144
145static int minix_fill_super(struct super_block *s, void *data, int silent)
146{
147 struct buffer_head *bh;
148 struct buffer_head **map;
149 struct minix_super_block *ms;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800150 struct minix3_super_block *m3s = NULL;
151 unsigned long i, block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 struct inode *root_inode;
153 struct minix_sb_info *sbi;
154
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700155 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 if (!sbi)
157 return -ENOMEM;
158 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700160 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
161 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 if (!sb_set_blocksize(s, BLOCK_SIZE))
164 goto out_bad_hblock;
165
166 if (!(bh = sb_bread(s, 1)))
167 goto out_bad_sb;
168
169 ms = (struct minix_super_block *) bh->b_data;
170 sbi->s_ms = ms;
171 sbi->s_sbh = bh;
172 sbi->s_mount_state = ms->s_state;
173 sbi->s_ninodes = ms->s_ninodes;
174 sbi->s_nzones = ms->s_nzones;
175 sbi->s_imap_blocks = ms->s_imap_blocks;
176 sbi->s_zmap_blocks = ms->s_zmap_blocks;
177 sbi->s_firstdatazone = ms->s_firstdatazone;
178 sbi->s_log_zone_size = ms->s_log_zone_size;
179 sbi->s_max_size = ms->s_max_size;
180 s->s_magic = ms->s_magic;
181 if (s->s_magic == MINIX_SUPER_MAGIC) {
182 sbi->s_version = MINIX_V1;
183 sbi->s_dirsize = 16;
184 sbi->s_namelen = 14;
185 sbi->s_link_max = MINIX_LINK_MAX;
186 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
187 sbi->s_version = MINIX_V1;
188 sbi->s_dirsize = 32;
189 sbi->s_namelen = 30;
190 sbi->s_link_max = MINIX_LINK_MAX;
191 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
192 sbi->s_version = MINIX_V2;
193 sbi->s_nzones = ms->s_zones;
194 sbi->s_dirsize = 16;
195 sbi->s_namelen = 14;
196 sbi->s_link_max = MINIX2_LINK_MAX;
197 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
198 sbi->s_version = MINIX_V2;
199 sbi->s_nzones = ms->s_zones;
200 sbi->s_dirsize = 32;
201 sbi->s_namelen = 30;
202 sbi->s_link_max = MINIX2_LINK_MAX;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800203 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
204 m3s = (struct minix3_super_block *) bh->b_data;
205 s->s_magic = m3s->s_magic;
206 sbi->s_imap_blocks = m3s->s_imap_blocks;
207 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
208 sbi->s_firstdatazone = m3s->s_firstdatazone;
209 sbi->s_log_zone_size = m3s->s_log_zone_size;
210 sbi->s_max_size = m3s->s_max_size;
211 sbi->s_ninodes = m3s->s_ninodes;
212 sbi->s_nzones = m3s->s_zones;
213 sbi->s_dirsize = 64;
214 sbi->s_namelen = 60;
215 sbi->s_version = MINIX_V3;
216 sbi->s_link_max = MINIX2_LINK_MAX;
217 sbi->s_mount_state = MINIX_VALID_FS;
218 sb_set_blocksize(s, m3s->s_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 } else
220 goto out_no_fs;
221
222 /*
223 * Allocate the buffer map to keep the superblock small.
224 */
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700225 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
226 goto out_illegal_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700228 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 if (!map)
230 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 sbi->s_imap = &map[0];
232 sbi->s_zmap = &map[sbi->s_imap_blocks];
233
234 block=2;
235 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
236 if (!(sbi->s_imap[i]=sb_bread(s, block)))
237 goto out_no_bitmap;
238 block++;
239 }
240 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
241 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
242 goto out_no_bitmap;
243 block++;
244 }
245
246 minix_set_bit(0,sbi->s_imap[0]->b_data);
247 minix_set_bit(0,sbi->s_zmap[0]->b_data);
248
249 /* set up enough so that it can read an inode */
250 s->s_op = &minix_sops;
251 root_inode = iget(s, MINIX_ROOT_INO);
252 if (!root_inode || is_bad_inode(root_inode))
253 goto out_no_root;
254
255 s->s_root = d_alloc_root(root_inode);
256 if (!s->s_root)
257 goto out_iput;
258
259 if (!NO_TRUNCATE)
260 s->s_root->d_op = &minix_dentry_operations;
261
262 if (!(s->s_flags & MS_RDONLY)) {
Andries Brouwer939b00d2007-02-12 00:52:49 -0800263 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
264 ms->s_state &= ~MINIX_VALID_FS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 mark_buffer_dirty(bh);
266 }
267 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800268 printk("MINIX-fs: mounting unchecked file system, "
269 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 else if (sbi->s_mount_state & MINIX_ERROR_FS)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800271 printk("MINIX-fs: mounting file system with errors, "
272 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 return 0;
274
275out_iput:
276 iput(root_inode);
277 goto out_freemap;
278
279out_no_root:
280 if (!silent)
281 printk("MINIX-fs: get root inode failed\n");
282 goto out_freemap;
283
284out_no_bitmap:
285 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700286out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 for (i = 0; i < sbi->s_imap_blocks; i++)
288 brelse(sbi->s_imap[i]);
289 for (i = 0; i < sbi->s_zmap_blocks; i++)
290 brelse(sbi->s_zmap[i]);
291 kfree(sbi->s_imap);
292 goto out_release;
293
294out_no_map:
295 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800296 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 goto out_release;
298
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700299out_illegal_sb:
300 if (!silent)
301 printk("MINIX-fs: bad superblock\n");
302 goto out_release;
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304out_no_fs:
305 if (!silent)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800306 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
307 "on device %s.\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700308out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 brelse(bh);
310 goto out;
311
312out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800313 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 goto out;
315
316out_bad_sb:
317 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700318out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 s->s_fs_info = NULL;
320 kfree(sbi);
321 return -EINVAL;
322}
323
David Howells726c3342006-06-23 02:02:58 -0700324static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
David Howells726c3342006-06-23 02:02:58 -0700326 struct minix_sb_info *sbi = minix_sb(dentry->d_sb);
327 buf->f_type = dentry->d_sb->s_magic;
328 buf->f_bsize = dentry->d_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
330 buf->f_bfree = minix_count_free_blocks(sbi);
331 buf->f_bavail = buf->f_bfree;
332 buf->f_files = sbi->s_ninodes;
333 buf->f_ffree = minix_count_free_inodes(sbi);
334 buf->f_namelen = sbi->s_namelen;
335 return 0;
336}
337
338static int minix_get_block(struct inode *inode, sector_t block,
339 struct buffer_head *bh_result, int create)
340{
341 if (INODE_VERSION(inode) == MINIX_V1)
342 return V1_minix_get_block(inode, block, bh_result, create);
343 else
344 return V2_minix_get_block(inode, block, bh_result, create);
345}
346
347static int minix_writepage(struct page *page, struct writeback_control *wbc)
348{
349 return block_write_full_page(page, minix_get_block, wbc);
350}
351static int minix_readpage(struct file *file, struct page *page)
352{
353 return block_read_full_page(page,minix_get_block);
354}
355static int minix_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
356{
357 return block_prepare_write(page,from,to,minix_get_block);
358}
359static sector_t minix_bmap(struct address_space *mapping, sector_t block)
360{
361 return generic_block_bmap(mapping,block,minix_get_block);
362}
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700363static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 .readpage = minix_readpage,
365 .writepage = minix_writepage,
366 .sync_page = block_sync_page,
367 .prepare_write = minix_prepare_write,
368 .commit_write = generic_commit_write,
369 .bmap = minix_bmap
370};
371
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800372static const struct inode_operations minix_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 .readlink = generic_readlink,
374 .follow_link = page_follow_link_light,
375 .put_link = page_put_link,
376 .getattr = minix_getattr,
377};
378
379void minix_set_inode(struct inode *inode, dev_t rdev)
380{
381 if (S_ISREG(inode->i_mode)) {
382 inode->i_op = &minix_file_inode_operations;
383 inode->i_fop = &minix_file_operations;
384 inode->i_mapping->a_ops = &minix_aops;
385 } else if (S_ISDIR(inode->i_mode)) {
386 inode->i_op = &minix_dir_inode_operations;
387 inode->i_fop = &minix_dir_operations;
388 inode->i_mapping->a_ops = &minix_aops;
389 } else if (S_ISLNK(inode->i_mode)) {
390 inode->i_op = &minix_symlink_inode_operations;
391 inode->i_mapping->a_ops = &minix_aops;
392 } else
393 init_special_inode(inode, inode->i_mode, rdev);
394}
395
396/*
397 * The minix V1 function to read an inode.
398 */
399static void V1_minix_read_inode(struct inode * inode)
400{
401 struct buffer_head * bh;
402 struct minix_inode * raw_inode;
403 struct minix_inode_info *minix_inode = minix_i(inode);
404 int i;
405
406 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
407 if (!raw_inode) {
408 make_bad_inode(inode);
409 return;
410 }
411 inode->i_mode = raw_inode->i_mode;
412 inode->i_uid = (uid_t)raw_inode->i_uid;
413 inode->i_gid = (gid_t)raw_inode->i_gid;
414 inode->i_nlink = raw_inode->i_nlinks;
415 inode->i_size = raw_inode->i_size;
416 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
417 inode->i_mtime.tv_nsec = 0;
418 inode->i_atime.tv_nsec = 0;
419 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700420 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 for (i = 0; i < 9; i++)
422 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
423 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
424 brelse(bh);
425}
426
427/*
428 * The minix V2 function to read an inode.
429 */
430static void V2_minix_read_inode(struct inode * inode)
431{
432 struct buffer_head * bh;
433 struct minix2_inode * raw_inode;
434 struct minix_inode_info *minix_inode = minix_i(inode);
435 int i;
436
437 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
438 if (!raw_inode) {
439 make_bad_inode(inode);
440 return;
441 }
442 inode->i_mode = raw_inode->i_mode;
443 inode->i_uid = (uid_t)raw_inode->i_uid;
444 inode->i_gid = (gid_t)raw_inode->i_gid;
445 inode->i_nlink = raw_inode->i_nlinks;
446 inode->i_size = raw_inode->i_size;
447 inode->i_mtime.tv_sec = raw_inode->i_mtime;
448 inode->i_atime.tv_sec = raw_inode->i_atime;
449 inode->i_ctime.tv_sec = raw_inode->i_ctime;
450 inode->i_mtime.tv_nsec = 0;
451 inode->i_atime.tv_nsec = 0;
452 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700453 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 for (i = 0; i < 10; i++)
455 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
456 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
457 brelse(bh);
458}
459
460/*
461 * The global function to read an inode.
462 */
463static void minix_read_inode(struct inode * inode)
464{
465 if (INODE_VERSION(inode) == MINIX_V1)
466 V1_minix_read_inode(inode);
467 else
468 V2_minix_read_inode(inode);
469}
470
471/*
472 * The minix V1 function to synchronize an inode.
473 */
474static struct buffer_head * V1_minix_update_inode(struct inode * inode)
475{
476 struct buffer_head * bh;
477 struct minix_inode * raw_inode;
478 struct minix_inode_info *minix_inode = minix_i(inode);
479 int i;
480
481 raw_inode = minix_V1_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_time = inode->i_mtime.tv_sec;
490 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
491 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
492 else for (i = 0; i < 9; i++)
493 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
494 mark_buffer_dirty(bh);
495 return bh;
496}
497
498/*
499 * The minix V2 function to synchronize an inode.
500 */
501static struct buffer_head * V2_minix_update_inode(struct inode * inode)
502{
503 struct buffer_head * bh;
504 struct minix2_inode * raw_inode;
505 struct minix_inode_info *minix_inode = minix_i(inode);
506 int i;
507
508 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
509 if (!raw_inode)
510 return NULL;
511 raw_inode->i_mode = inode->i_mode;
512 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
513 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
514 raw_inode->i_nlinks = inode->i_nlink;
515 raw_inode->i_size = inode->i_size;
516 raw_inode->i_mtime = inode->i_mtime.tv_sec;
517 raw_inode->i_atime = inode->i_atime.tv_sec;
518 raw_inode->i_ctime = inode->i_ctime.tv_sec;
519 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
520 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
521 else for (i = 0; i < 10; i++)
522 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
523 mark_buffer_dirty(bh);
524 return bh;
525}
526
527static struct buffer_head *minix_update_inode(struct inode *inode)
528{
529 if (INODE_VERSION(inode) == MINIX_V1)
530 return V1_minix_update_inode(inode);
531 else
532 return V2_minix_update_inode(inode);
533}
534
535static int minix_write_inode(struct inode * inode, int wait)
536{
537 brelse(minix_update_inode(inode));
538 return 0;
539}
540
541int minix_sync_inode(struct inode * inode)
542{
543 int err = 0;
544 struct buffer_head *bh;
545
546 bh = minix_update_inode(inode);
547 if (bh && buffer_dirty(bh))
548 {
549 sync_dirty_buffer(bh);
550 if (buffer_req(bh) && !buffer_uptodate(bh))
551 {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800552 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 inode->i_sb->s_id, inode->i_ino);
554 err = -1;
555 }
556 }
557 else if (!bh)
558 err = -1;
559 brelse (bh);
560 return err;
561}
562
563int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
564{
Andries Brouwer939b00d2007-02-12 00:52:49 -0800565 struct inode *dir = dentry->d_parent->d_inode;
566 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 generic_fillattr(dentry->d_inode, stat);
568 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800569 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 else
Andries Brouwer939b00d2007-02-12 00:52:49 -0800571 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
572 stat->blksize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 return 0;
574}
575
576/*
577 * The function that is called for file truncation.
578 */
579void minix_truncate(struct inode * inode)
580{
581 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
582 return;
583 if (INODE_VERSION(inode) == MINIX_V1)
584 V1_minix_truncate(inode);
585 else
586 V2_minix_truncate(inode);
587}
588
David Howells454e2392006-06-23 02:02:57 -0700589static int minix_get_sb(struct file_system_type *fs_type,
590 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
David Howells454e2392006-06-23 02:02:57 -0700592 return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
593 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
596static struct file_system_type minix_fs_type = {
597 .owner = THIS_MODULE,
598 .name = "minix",
599 .get_sb = minix_get_sb,
600 .kill_sb = kill_block_super,
601 .fs_flags = FS_REQUIRES_DEV,
602};
603
604static int __init init_minix_fs(void)
605{
606 int err = init_inodecache();
607 if (err)
608 goto out1;
609 err = register_filesystem(&minix_fs_type);
610 if (err)
611 goto out;
612 return 0;
613out:
614 destroy_inodecache();
615out1:
616 return err;
617}
618
619static void __exit exit_minix_fs(void)
620{
621 unregister_filesystem(&minix_fs_type);
622 destroy_inodecache();
623}
624
625module_init(init_minix_fs)
626module_exit(exit_minix_fs)
627MODULE_LICENSE("GPL");
628