blob: fa8b612b8ce29eb0c16b6dccf8a61eb1b1a6f283 [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 *
Gertjan van Wingerdef762dd62009-03-21 23:18:57 +01006 * Copyright (C) 1996 Gertjan van Wingerde
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010020#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Christoph Hellwiga9185b42010-03-05 09:21:37 +010022static int minix_write_inode(struct inode *inode,
23 struct writeback_control *wbc);
David Howells726c3342006-06-23 02:02:58 -070024static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025static int minix_remount (struct super_block * sb, int * flags, char * data);
26
Al Viro5ccb4a72010-06-04 22:27:38 -040027static void minix_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028{
Mark Fashehfef26652005-09-09 13:01:31 -070029 truncate_inode_pages(&inode->i_data, 0);
Al Viro5ccb4a72010-06-04 22:27:38 -040030 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038}
39
40static 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)) {
Andries Brouwer939b00d2007-02-12 00:52:49 -080046 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
47 sbi->s_ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058}
59
Christoph Lametere18b8902006-12-06 20:33:20 -080060static struct kmem_cache * minix_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62static struct inode *minix_alloc_inode(struct super_block *sb)
63{
64 struct minix_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080065 ei = (struct minix_inode_info *)kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (!ei)
67 return NULL;
68 return &ei->vfs_inode;
69}
70
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110071static void minix_i_callback(struct rcu_head *head)
72{
73 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110074 kmem_cache_free(minix_inode_cachep, minix_i(inode));
75}
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077static void minix_destroy_inode(struct inode *inode)
78{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110079 call_rcu(&inode->i_rcu, minix_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070082static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
84 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
85
Christoph Lametera35afb82007-05-16 22:10:57 -070086 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
Paul Mundt20c2df82007-07-20 10:11:58 +090088
Linus Torvalds1da177e2005-04-16 15:20:36 -070089static int init_inodecache(void)
90{
91 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
92 sizeof(struct minix_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -080093 0, (SLAB_RECLAIM_ACCOUNT|
94 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +090095 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (minix_inode_cachep == NULL)
97 return -ENOMEM;
98 return 0;
99}
100
101static void destroy_inodecache(void)
102{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700103 kmem_cache_destroy(minix_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800106static const struct super_operations minix_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 .alloc_inode = minix_alloc_inode,
108 .destroy_inode = minix_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 .write_inode = minix_write_inode,
Al Viro5ccb4a72010-06-04 22:27:38 -0400110 .evict_inode = minix_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 .put_super = minix_put_super,
112 .statfs = minix_statfs,
113 .remount_fs = minix_remount,
114};
115
116static 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. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800129 if (sbi->s_version != MINIX_V3)
130 ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 mark_buffer_dirty(sbi->s_sbh);
132 } else {
133 /* Mount a partition which is read-only, read-write. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800134 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 mark_buffer_dirty(sbi->s_sbh);
141
142 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800143 printk("MINIX-fs warning: remounting unchecked fs, "
144 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800146 printk("MINIX-fs warning: remounting fs with errors, "
147 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
149 return 0;
150}
151
152static 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;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800157 struct minix3_super_block *m3s = NULL;
158 unsigned long i, block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 struct inode *root_inode;
160 struct minix_sb_info *sbi;
David Howellsa90a0882008-02-07 00:15:44 -0800161 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700163 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (!sbi)
165 return -ENOMEM;
166 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700168 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
169 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
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 sbi->s_link_max = 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 sbi->s_link_max = 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 sbi->s_link_max = 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 sbi->s_link_max = MINIX2_LINK_MAX;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800211 } 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_link_max = MINIX2_LINK_MAX;
225 sbi->s_mount_state = MINIX_VALID_FS;
226 sb_set_blocksize(s, m3s->s_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 } else
228 goto out_no_fs;
229
230 /*
231 * Allocate the buffer map to keep the superblock small.
232 */
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700233 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
234 goto out_illegal_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700236 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 if (!map)
238 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 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 /* set up enough so that it can read an inode */
258 s->s_op = &minix_sops;
David Howellsa90a0882008-02-07 00:15:44 -0800259 root_inode = minix_iget(s, MINIX_ROOT_INO);
260 if (IS_ERR(root_inode)) {
261 ret = PTR_ERR(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 goto out_no_root;
David Howellsa90a0882008-02-07 00:15:44 -0800263 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Josh Boyer016e8d42011-08-19 14:50:26 -0400265 /* Apparently minix can create filesystems that allocate more blocks for
266 * the bitmaps than needed. We simply ignore that, but verify it didn't
267 * create one with not enough blocks and bail out if so.
268 */
269 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
270 if (sbi->s_imap_blocks < block) {
271 printk("MINIX-fs: file system does not have enough "
272 "imap blocks allocated. Refusing to mount\n");
273 goto out_iput;
274 }
275
276 block = minix_blocks_needed(
277 (sbi->s_nzones - (sbi->s_firstdatazone + 1)),
278 s->s_blocksize);
279 if (sbi->s_zmap_blocks < block) {
280 printk("MINIX-fs: file system does not have enough "
281 "zmap blocks allocated. Refusing to mount.\n");
282 goto out_iput;
283 }
284
Al Virod6042ea2012-01-04 10:51:03 +0000285 ret = -ENOMEM;
286 s->s_root = d_alloc_root(root_inode);
287 if (!s->s_root)
288 goto out_iput;
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return 0;
303
304out_iput:
305 iput(root_inode);
306 goto out_freemap;
307
308out_no_root:
309 if (!silent)
310 printk("MINIX-fs: get root inode failed\n");
311 goto out_freemap;
312
313out_no_bitmap:
314 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700315out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 for (i = 0; i < sbi->s_imap_blocks; i++)
317 brelse(sbi->s_imap[i]);
318 for (i = 0; i < sbi->s_zmap_blocks; i++)
319 brelse(sbi->s_zmap[i]);
320 kfree(sbi->s_imap);
321 goto out_release;
322
323out_no_map:
David Howellsa90a0882008-02-07 00:15:44 -0800324 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800326 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 goto out_release;
328
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700329out_illegal_sb:
330 if (!silent)
331 printk("MINIX-fs: bad superblock\n");
332 goto out_release;
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334out_no_fs:
335 if (!silent)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800336 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
337 "on device %s.\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700338out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 brelse(bh);
340 goto out;
341
342out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800343 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 goto out;
345
346out_bad_sb:
347 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700348out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 s->s_fs_info = NULL;
350 kfree(sbi);
David Howellsa90a0882008-02-07 00:15:44 -0800351 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
David Howells726c3342006-06-23 02:02:58 -0700354static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355{
Coly Li054475d2009-04-02 16:59:39 -0700356 struct super_block *sb = dentry->d_sb;
357 struct minix_sb_info *sbi = minix_sb(sb);
358 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
359 buf->f_type = sb->s_magic;
360 buf->f_bsize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
Josh Boyer016e8d42011-08-19 14:50:26 -0400362 buf->f_bfree = minix_count_free_blocks(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 buf->f_bavail = buf->f_bfree;
364 buf->f_files = sbi->s_ninodes;
Josh Boyer016e8d42011-08-19 14:50:26 -0400365 buf->f_ffree = minix_count_free_inodes(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 buf->f_namelen = sbi->s_namelen;
Coly Li054475d2009-04-02 16:59:39 -0700367 buf->f_fsid.val[0] = (u32)id;
368 buf->f_fsid.val[1] = (u32)(id >> 32);
369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return 0;
371}
372
373static int minix_get_block(struct inode *inode, sector_t block,
374 struct buffer_head *bh_result, int create)
375{
376 if (INODE_VERSION(inode) == MINIX_V1)
377 return V1_minix_get_block(inode, block, bh_result, create);
378 else
379 return V2_minix_get_block(inode, block, bh_result, create);
380}
381
382static int minix_writepage(struct page *page, struct writeback_control *wbc)
383{
384 return block_write_full_page(page, minix_get_block, wbc);
385}
Nick Piggin4a66af92007-10-16 01:25:21 -0700386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387static int minix_readpage(struct file *file, struct page *page)
388{
389 return block_read_full_page(page,minix_get_block);
390}
Nick Piggin4a66af92007-10-16 01:25:21 -0700391
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200392int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
Christoph Hellwig6e1db882010-06-04 11:29:57 +0200394 return __block_write_begin(page, pos, len, minix_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395}
Nick Piggin4a66af92007-10-16 01:25:21 -0700396
397static int minix_write_begin(struct file *file, struct address_space *mapping,
398 loff_t pos, unsigned len, unsigned flags,
399 struct page **pagep, void **fsdata)
400{
Christoph Hellwig155130a2010-06-04 11:29:58 +0200401 int ret;
402
403 ret = block_write_begin(mapping, pos, len, flags, pagep,
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200404 minix_get_block);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200405 if (unlikely(ret)) {
406 loff_t isize = mapping->host->i_size;
407 if (pos + len > isize)
408 vmtruncate(mapping->host, isize);
409 }
410
411 return ret;
Nick Piggin4a66af92007-10-16 01:25:21 -0700412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414static sector_t minix_bmap(struct address_space *mapping, sector_t block)
415{
416 return generic_block_bmap(mapping,block,minix_get_block);
417}
Nick Piggin4a66af92007-10-16 01:25:21 -0700418
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700419static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 .readpage = minix_readpage,
421 .writepage = minix_writepage,
Nick Piggin4a66af92007-10-16 01:25:21 -0700422 .write_begin = minix_write_begin,
423 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 .bmap = minix_bmap
425};
426
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800427static const struct inode_operations minix_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 .readlink = generic_readlink,
429 .follow_link = page_follow_link_light,
430 .put_link = page_put_link,
431 .getattr = minix_getattr,
432};
433
434void minix_set_inode(struct inode *inode, dev_t rdev)
435{
436 if (S_ISREG(inode->i_mode)) {
437 inode->i_op = &minix_file_inode_operations;
438 inode->i_fop = &minix_file_operations;
439 inode->i_mapping->a_ops = &minix_aops;
440 } else if (S_ISDIR(inode->i_mode)) {
441 inode->i_op = &minix_dir_inode_operations;
442 inode->i_fop = &minix_dir_operations;
443 inode->i_mapping->a_ops = &minix_aops;
444 } else if (S_ISLNK(inode->i_mode)) {
445 inode->i_op = &minix_symlink_inode_operations;
446 inode->i_mapping->a_ops = &minix_aops;
447 } else
448 init_special_inode(inode, inode->i_mode, rdev);
449}
450
451/*
452 * The minix V1 function to read an inode.
453 */
David Howellsa90a0882008-02-07 00:15:44 -0800454static struct inode *V1_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
456 struct buffer_head * bh;
457 struct minix_inode * raw_inode;
458 struct minix_inode_info *minix_inode = minix_i(inode);
459 int i;
460
461 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
462 if (!raw_inode) {
David Howellsa90a0882008-02-07 00:15:44 -0800463 iget_failed(inode);
464 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 }
466 inode->i_mode = raw_inode->i_mode;
467 inode->i_uid = (uid_t)raw_inode->i_uid;
468 inode->i_gid = (gid_t)raw_inode->i_gid;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200469 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 inode->i_size = raw_inode->i_size;
471 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
472 inode->i_mtime.tv_nsec = 0;
473 inode->i_atime.tv_nsec = 0;
474 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700475 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 for (i = 0; i < 9; i++)
477 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
478 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
479 brelse(bh);
David Howellsa90a0882008-02-07 00:15:44 -0800480 unlock_new_inode(inode);
481 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482}
483
484/*
485 * The minix V2 function to read an inode.
486 */
David Howellsa90a0882008-02-07 00:15:44 -0800487static struct inode *V2_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
489 struct buffer_head * bh;
490 struct minix2_inode * raw_inode;
491 struct minix_inode_info *minix_inode = minix_i(inode);
492 int i;
493
494 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
495 if (!raw_inode) {
David Howellsa90a0882008-02-07 00:15:44 -0800496 iget_failed(inode);
497 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 }
499 inode->i_mode = raw_inode->i_mode;
500 inode->i_uid = (uid_t)raw_inode->i_uid;
501 inode->i_gid = (gid_t)raw_inode->i_gid;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200502 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 inode->i_size = raw_inode->i_size;
504 inode->i_mtime.tv_sec = raw_inode->i_mtime;
505 inode->i_atime.tv_sec = raw_inode->i_atime;
506 inode->i_ctime.tv_sec = raw_inode->i_ctime;
507 inode->i_mtime.tv_nsec = 0;
508 inode->i_atime.tv_nsec = 0;
509 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700510 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 for (i = 0; i < 10; i++)
512 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
513 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
514 brelse(bh);
David Howellsa90a0882008-02-07 00:15:44 -0800515 unlock_new_inode(inode);
516 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
519/*
520 * The global function to read an inode.
521 */
David Howellsa90a0882008-02-07 00:15:44 -0800522struct inode *minix_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
David Howellsa90a0882008-02-07 00:15:44 -0800524 struct inode *inode;
525
526 inode = iget_locked(sb, ino);
527 if (!inode)
528 return ERR_PTR(-ENOMEM);
529 if (!(inode->i_state & I_NEW))
530 return inode;
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 if (INODE_VERSION(inode) == MINIX_V1)
David Howellsa90a0882008-02-07 00:15:44 -0800533 return V1_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 else
David Howellsa90a0882008-02-07 00:15:44 -0800535 return V2_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536}
537
538/*
539 * The minix V1 function to synchronize an inode.
540 */
541static struct buffer_head * V1_minix_update_inode(struct inode * inode)
542{
543 struct buffer_head * bh;
544 struct minix_inode * raw_inode;
545 struct minix_inode_info *minix_inode = minix_i(inode);
546 int i;
547
548 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
549 if (!raw_inode)
550 return NULL;
551 raw_inode->i_mode = inode->i_mode;
552 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
553 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
554 raw_inode->i_nlinks = inode->i_nlink;
555 raw_inode->i_size = inode->i_size;
556 raw_inode->i_time = inode->i_mtime.tv_sec;
557 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
558 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
559 else for (i = 0; i < 9; i++)
560 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
561 mark_buffer_dirty(bh);
562 return bh;
563}
564
565/*
566 * The minix V2 function to synchronize an inode.
567 */
568static struct buffer_head * V2_minix_update_inode(struct inode * inode)
569{
570 struct buffer_head * bh;
571 struct minix2_inode * raw_inode;
572 struct minix_inode_info *minix_inode = minix_i(inode);
573 int i;
574
575 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
576 if (!raw_inode)
577 return NULL;
578 raw_inode->i_mode = inode->i_mode;
579 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
580 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
581 raw_inode->i_nlinks = inode->i_nlink;
582 raw_inode->i_size = inode->i_size;
583 raw_inode->i_mtime = inode->i_mtime.tv_sec;
584 raw_inode->i_atime = inode->i_atime.tv_sec;
585 raw_inode->i_ctime = inode->i_ctime.tv_sec;
586 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
587 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
588 else for (i = 0; i < 10; i++)
589 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
590 mark_buffer_dirty(bh);
591 return bh;
592}
593
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100594static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
596 int err = 0;
597 struct buffer_head *bh;
598
Al Viro0d7916d2009-06-07 15:21:06 -0400599 if (INODE_VERSION(inode) == MINIX_V1)
600 bh = V1_minix_update_inode(inode);
601 else
602 bh = V2_minix_update_inode(inode);
603 if (!bh)
604 return -EIO;
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100605 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 sync_dirty_buffer(bh);
Al Viro0d7916d2009-06-07 15:21:06 -0400607 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800608 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 inode->i_sb->s_id, inode->i_ino);
Al Viro0d7916d2009-06-07 15:21:06 -0400610 err = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 }
612 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 brelse (bh);
614 return err;
615}
616
617int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
618{
Al Viro2def9e42011-07-16 17:43:09 -0400619 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 generic_fillattr(dentry->d_inode, stat);
621 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800622 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 else
Andries Brouwer939b00d2007-02-12 00:52:49 -0800624 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
625 stat->blksize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 return 0;
627}
628
629/*
630 * The function that is called for file truncation.
631 */
632void minix_truncate(struct inode * inode)
633{
634 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
635 return;
636 if (INODE_VERSION(inode) == MINIX_V1)
637 V1_minix_truncate(inode);
638 else
639 V2_minix_truncate(inode);
640}
641
Al Viro152a0832010-07-25 00:46:55 +0400642static struct dentry *minix_mount(struct file_system_type *fs_type,
643 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
Al Viro152a0832010-07-25 00:46:55 +0400645 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647
648static struct file_system_type minix_fs_type = {
649 .owner = THIS_MODULE,
650 .name = "minix",
Al Viro152a0832010-07-25 00:46:55 +0400651 .mount = minix_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 .kill_sb = kill_block_super,
653 .fs_flags = FS_REQUIRES_DEV,
654};
655
656static int __init init_minix_fs(void)
657{
658 int err = init_inodecache();
659 if (err)
660 goto out1;
661 err = register_filesystem(&minix_fs_type);
662 if (err)
663 goto out;
664 return 0;
665out:
666 destroy_inodecache();
667out1:
668 return err;
669}
670
671static void __exit exit_minix_fs(void)
672{
673 unregister_filesystem(&minix_fs_type);
674 destroy_inodecache();
675}
676
677module_init(init_minix_fs)
678module_exit(exit_minix_fs)
679MODULE_LICENSE("GPL");
680