blob: 4fc5f8ab1c44a47534e1b2b9a0bb338aea451dc7 [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);
Jan Karadbd57682012-05-03 14:48:02 +020035 clear_inode(inode);
Al Viro5ccb4a72010-06-04 22:27:38 -040036 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{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000103 /*
104 * Make sure all delayed rcu free inodes are flushed before we
105 * destroy cache.
106 */
107 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700108 kmem_cache_destroy(minix_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800111static const struct super_operations minix_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 .alloc_inode = minix_alloc_inode,
113 .destroy_inode = minix_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 .write_inode = minix_write_inode,
Al Viro5ccb4a72010-06-04 22:27:38 -0400115 .evict_inode = minix_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 .put_super = minix_put_super,
117 .statfs = minix_statfs,
118 .remount_fs = minix_remount,
119};
120
121static int minix_remount (struct super_block * sb, int * flags, char * data)
122{
123 struct minix_sb_info * sbi = minix_sb(sb);
124 struct minix_super_block * ms;
125
126 ms = sbi->s_ms;
127 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
128 return 0;
129 if (*flags & MS_RDONLY) {
130 if (ms->s_state & MINIX_VALID_FS ||
131 !(sbi->s_mount_state & MINIX_VALID_FS))
132 return 0;
133 /* Mounting a rw partition read-only. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800134 if (sbi->s_version != MINIX_V3)
135 ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 mark_buffer_dirty(sbi->s_sbh);
137 } else {
138 /* Mount a partition which is read-only, read-write. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800139 if (sbi->s_version != MINIX_V3) {
140 sbi->s_mount_state = ms->s_state;
141 ms->s_state &= ~MINIX_VALID_FS;
142 } else {
143 sbi->s_mount_state = MINIX_VALID_FS;
144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 mark_buffer_dirty(sbi->s_sbh);
146
147 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800148 printk("MINIX-fs warning: remounting unchecked fs, "
149 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800151 printk("MINIX-fs warning: remounting fs with errors, "
152 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
154 return 0;
155}
156
157static int minix_fill_super(struct super_block *s, void *data, int silent)
158{
159 struct buffer_head *bh;
160 struct buffer_head **map;
161 struct minix_super_block *ms;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800162 struct minix3_super_block *m3s = NULL;
163 unsigned long i, block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct inode *root_inode;
165 struct minix_sb_info *sbi;
David Howellsa90a0882008-02-07 00:15:44 -0800166 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700168 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (!sbi)
170 return -ENOMEM;
171 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700173 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
174 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 if (!sb_set_blocksize(s, BLOCK_SIZE))
177 goto out_bad_hblock;
178
179 if (!(bh = sb_bread(s, 1)))
180 goto out_bad_sb;
181
182 ms = (struct minix_super_block *) bh->b_data;
183 sbi->s_ms = ms;
184 sbi->s_sbh = bh;
185 sbi->s_mount_state = ms->s_state;
186 sbi->s_ninodes = ms->s_ninodes;
187 sbi->s_nzones = ms->s_nzones;
188 sbi->s_imap_blocks = ms->s_imap_blocks;
189 sbi->s_zmap_blocks = ms->s_zmap_blocks;
190 sbi->s_firstdatazone = ms->s_firstdatazone;
191 sbi->s_log_zone_size = ms->s_log_zone_size;
192 sbi->s_max_size = ms->s_max_size;
193 s->s_magic = ms->s_magic;
194 if (s->s_magic == MINIX_SUPER_MAGIC) {
195 sbi->s_version = MINIX_V1;
196 sbi->s_dirsize = 16;
197 sbi->s_namelen = 14;
Al Viro8de52772012-02-06 12:45:27 -0500198 s->s_max_links = MINIX_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
200 sbi->s_version = MINIX_V1;
201 sbi->s_dirsize = 32;
202 sbi->s_namelen = 30;
Al Viro8de52772012-02-06 12:45:27 -0500203 s->s_max_links = MINIX_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
205 sbi->s_version = MINIX_V2;
206 sbi->s_nzones = ms->s_zones;
207 sbi->s_dirsize = 16;
208 sbi->s_namelen = 14;
Al Viro8de52772012-02-06 12:45:27 -0500209 s->s_max_links = MINIX2_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
211 sbi->s_version = MINIX_V2;
212 sbi->s_nzones = ms->s_zones;
213 sbi->s_dirsize = 32;
214 sbi->s_namelen = 30;
Al Viro8de52772012-02-06 12:45:27 -0500215 s->s_max_links = MINIX2_LINK_MAX;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800216 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
217 m3s = (struct minix3_super_block *) bh->b_data;
218 s->s_magic = m3s->s_magic;
219 sbi->s_imap_blocks = m3s->s_imap_blocks;
220 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
221 sbi->s_firstdatazone = m3s->s_firstdatazone;
222 sbi->s_log_zone_size = m3s->s_log_zone_size;
223 sbi->s_max_size = m3s->s_max_size;
224 sbi->s_ninodes = m3s->s_ninodes;
225 sbi->s_nzones = m3s->s_zones;
226 sbi->s_dirsize = 64;
227 sbi->s_namelen = 60;
228 sbi->s_version = MINIX_V3;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800229 sbi->s_mount_state = MINIX_VALID_FS;
230 sb_set_blocksize(s, m3s->s_blocksize);
Al Viro8de52772012-02-06 12:45:27 -0500231 s->s_max_links = MINIX2_LINK_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 } else
233 goto out_no_fs;
234
235 /*
236 * Allocate the buffer map to keep the superblock small.
237 */
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700238 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
239 goto out_illegal_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700241 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 if (!map)
243 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 sbi->s_imap = &map[0];
245 sbi->s_zmap = &map[sbi->s_imap_blocks];
246
247 block=2;
248 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
249 if (!(sbi->s_imap[i]=sb_bread(s, block)))
250 goto out_no_bitmap;
251 block++;
252 }
253 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
254 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
255 goto out_no_bitmap;
256 block++;
257 }
258
259 minix_set_bit(0,sbi->s_imap[0]->b_data);
260 minix_set_bit(0,sbi->s_zmap[0]->b_data);
261
Josh Boyer016e8d42011-08-19 14:50:26 -0400262 /* Apparently minix can create filesystems that allocate more blocks for
263 * the bitmaps than needed. We simply ignore that, but verify it didn't
264 * create one with not enough blocks and bail out if so.
265 */
266 block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize);
267 if (sbi->s_imap_blocks < block) {
268 printk("MINIX-fs: file system does not have enough "
269 "imap blocks allocated. Refusing to mount\n");
Al Viroca85c072012-02-12 22:07:43 -0500270 goto out_no_bitmap;
Josh Boyer016e8d42011-08-19 14:50:26 -0400271 }
272
273 block = minix_blocks_needed(
274 (sbi->s_nzones - (sbi->s_firstdatazone + 1)),
275 s->s_blocksize);
276 if (sbi->s_zmap_blocks < block) {
277 printk("MINIX-fs: file system does not have enough "
278 "zmap blocks allocated. Refusing to mount.\n");
Al Viroca85c072012-02-12 22:07:43 -0500279 goto out_no_bitmap;
280 }
281
282 /* set up enough so that it can read an inode */
283 s->s_op = &minix_sops;
284 root_inode = minix_iget(s, MINIX_ROOT_INO);
285 if (IS_ERR(root_inode)) {
286 ret = PTR_ERR(root_inode);
287 goto out_no_root;
Josh Boyer016e8d42011-08-19 14:50:26 -0400288 }
289
Al Virod6042ea2012-01-04 10:51:03 +0000290 ret = -ENOMEM;
Al Viroca85c072012-02-12 22:07:43 -0500291 s->s_root = d_make_root(root_inode);
Al Virod6042ea2012-01-04 10:51:03 +0000292 if (!s->s_root)
Al Viroca85c072012-02-12 22:07:43 -0500293 goto out_no_root;
Al Virod6042ea2012-01-04 10:51:03 +0000294
295 if (!(s->s_flags & MS_RDONLY)) {
296 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
297 ms->s_state &= ~MINIX_VALID_FS;
298 mark_buffer_dirty(bh);
299 }
300 if (!(sbi->s_mount_state & MINIX_VALID_FS))
301 printk("MINIX-fs: mounting unchecked file system, "
302 "running fsck is recommended\n");
303 else if (sbi->s_mount_state & MINIX_ERROR_FS)
304 printk("MINIX-fs: mounting file system with errors, "
305 "running fsck is recommended\n");
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return 0;
308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309out_no_root:
310 if (!silent)
311 printk("MINIX-fs: get root inode failed\n");
312 goto out_freemap;
313
314out_no_bitmap:
315 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700316out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 for (i = 0; i < sbi->s_imap_blocks; i++)
318 brelse(sbi->s_imap[i]);
319 for (i = 0; i < sbi->s_zmap_blocks; i++)
320 brelse(sbi->s_zmap[i]);
321 kfree(sbi->s_imap);
322 goto out_release;
323
324out_no_map:
David Howellsa90a0882008-02-07 00:15:44 -0800325 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800327 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 goto out_release;
329
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700330out_illegal_sb:
331 if (!silent)
332 printk("MINIX-fs: bad superblock\n");
333 goto out_release;
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335out_no_fs:
336 if (!silent)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800337 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
338 "on device %s.\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700339out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 brelse(bh);
341 goto out;
342
343out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800344 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 goto out;
346
347out_bad_sb:
348 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700349out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 s->s_fs_info = NULL;
351 kfree(sbi);
David Howellsa90a0882008-02-07 00:15:44 -0800352 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353}
354
David Howells726c3342006-06-23 02:02:58 -0700355static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
Coly Li054475d2009-04-02 16:59:39 -0700357 struct super_block *sb = dentry->d_sb;
358 struct minix_sb_info *sbi = minix_sb(sb);
359 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
360 buf->f_type = sb->s_magic;
361 buf->f_bsize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
Josh Boyer016e8d42011-08-19 14:50:26 -0400363 buf->f_bfree = minix_count_free_blocks(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 buf->f_bavail = buf->f_bfree;
365 buf->f_files = sbi->s_ninodes;
Josh Boyer016e8d42011-08-19 14:50:26 -0400366 buf->f_ffree = minix_count_free_inodes(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 buf->f_namelen = sbi->s_namelen;
Coly Li054475d2009-04-02 16:59:39 -0700368 buf->f_fsid.val[0] = (u32)id;
369 buf->f_fsid.val[1] = (u32)(id >> 32);
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 return 0;
372}
373
374static int minix_get_block(struct inode *inode, sector_t block,
375 struct buffer_head *bh_result, int create)
376{
377 if (INODE_VERSION(inode) == MINIX_V1)
378 return V1_minix_get_block(inode, block, bh_result, create);
379 else
380 return V2_minix_get_block(inode, block, bh_result, create);
381}
382
383static int minix_writepage(struct page *page, struct writeback_control *wbc)
384{
385 return block_write_full_page(page, minix_get_block, wbc);
386}
Nick Piggin4a66af92007-10-16 01:25:21 -0700387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388static int minix_readpage(struct file *file, struct page *page)
389{
390 return block_read_full_page(page,minix_get_block);
391}
Nick Piggin4a66af92007-10-16 01:25:21 -0700392
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200393int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394{
Christoph Hellwig6e1db882010-06-04 11:29:57 +0200395 return __block_write_begin(page, pos, len, minix_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396}
Nick Piggin4a66af92007-10-16 01:25:21 -0700397
398static int minix_write_begin(struct file *file, struct address_space *mapping,
399 loff_t pos, unsigned len, unsigned flags,
400 struct page **pagep, void **fsdata)
401{
Christoph Hellwig155130a2010-06-04 11:29:58 +0200402 int ret;
403
404 ret = block_write_begin(mapping, pos, len, flags, pagep,
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200405 minix_get_block);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200406 if (unlikely(ret)) {
407 loff_t isize = mapping->host->i_size;
408 if (pos + len > isize)
409 vmtruncate(mapping->host, isize);
410 }
411
412 return ret;
Nick Piggin4a66af92007-10-16 01:25:21 -0700413}
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415static sector_t minix_bmap(struct address_space *mapping, sector_t block)
416{
417 return generic_block_bmap(mapping,block,minix_get_block);
418}
Nick Piggin4a66af92007-10-16 01:25:21 -0700419
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700420static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 .readpage = minix_readpage,
422 .writepage = minix_writepage,
Nick Piggin4a66af92007-10-16 01:25:21 -0700423 .write_begin = minix_write_begin,
424 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 .bmap = minix_bmap
426};
427
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800428static const struct inode_operations minix_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 .readlink = generic_readlink,
430 .follow_link = page_follow_link_light,
431 .put_link = page_put_link,
432 .getattr = minix_getattr,
433};
434
435void minix_set_inode(struct inode *inode, dev_t rdev)
436{
437 if (S_ISREG(inode->i_mode)) {
438 inode->i_op = &minix_file_inode_operations;
439 inode->i_fop = &minix_file_operations;
440 inode->i_mapping->a_ops = &minix_aops;
441 } else if (S_ISDIR(inode->i_mode)) {
442 inode->i_op = &minix_dir_inode_operations;
443 inode->i_fop = &minix_dir_operations;
444 inode->i_mapping->a_ops = &minix_aops;
445 } else if (S_ISLNK(inode->i_mode)) {
446 inode->i_op = &minix_symlink_inode_operations;
447 inode->i_mapping->a_ops = &minix_aops;
448 } else
449 init_special_inode(inode, inode->i_mode, rdev);
450}
451
452/*
453 * The minix V1 function to read an inode.
454 */
David Howellsa90a0882008-02-07 00:15:44 -0800455static struct inode *V1_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
457 struct buffer_head * bh;
458 struct minix_inode * raw_inode;
459 struct minix_inode_info *minix_inode = minix_i(inode);
460 int i;
461
462 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
463 if (!raw_inode) {
David Howellsa90a0882008-02-07 00:15:44 -0800464 iget_failed(inode);
465 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
467 inode->i_mode = raw_inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800468 i_uid_write(inode, raw_inode->i_uid);
469 i_gid_write(inode, raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200470 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 inode->i_size = raw_inode->i_size;
472 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
473 inode->i_mtime.tv_nsec = 0;
474 inode->i_atime.tv_nsec = 0;
475 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700476 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 for (i = 0; i < 9; i++)
478 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
479 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
480 brelse(bh);
David Howellsa90a0882008-02-07 00:15:44 -0800481 unlock_new_inode(inode);
482 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
484
485/*
486 * The minix V2 function to read an inode.
487 */
David Howellsa90a0882008-02-07 00:15:44 -0800488static struct inode *V2_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
490 struct buffer_head * bh;
491 struct minix2_inode * raw_inode;
492 struct minix_inode_info *minix_inode = minix_i(inode);
493 int i;
494
495 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
496 if (!raw_inode) {
David Howellsa90a0882008-02-07 00:15:44 -0800497 iget_failed(inode);
498 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 }
500 inode->i_mode = raw_inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800501 i_uid_write(inode, raw_inode->i_uid);
502 i_gid_write(inode, raw_inode->i_gid);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200503 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 inode->i_size = raw_inode->i_size;
505 inode->i_mtime.tv_sec = raw_inode->i_mtime;
506 inode->i_atime.tv_sec = raw_inode->i_atime;
507 inode->i_ctime.tv_sec = raw_inode->i_ctime;
508 inode->i_mtime.tv_nsec = 0;
509 inode->i_atime.tv_nsec = 0;
510 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700511 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 for (i = 0; i < 10; i++)
513 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
514 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
515 brelse(bh);
David Howellsa90a0882008-02-07 00:15:44 -0800516 unlock_new_inode(inode);
517 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518}
519
520/*
521 * The global function to read an inode.
522 */
David Howellsa90a0882008-02-07 00:15:44 -0800523struct inode *minix_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
David Howellsa90a0882008-02-07 00:15:44 -0800525 struct inode *inode;
526
527 inode = iget_locked(sb, ino);
528 if (!inode)
529 return ERR_PTR(-ENOMEM);
530 if (!(inode->i_state & I_NEW))
531 return inode;
532
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if (INODE_VERSION(inode) == MINIX_V1)
David Howellsa90a0882008-02-07 00:15:44 -0800534 return V1_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 else
David Howellsa90a0882008-02-07 00:15:44 -0800536 return V2_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537}
538
539/*
540 * The minix V1 function to synchronize an inode.
541 */
542static struct buffer_head * V1_minix_update_inode(struct inode * inode)
543{
544 struct buffer_head * bh;
545 struct minix_inode * raw_inode;
546 struct minix_inode_info *minix_inode = minix_i(inode);
547 int i;
548
549 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
550 if (!raw_inode)
551 return NULL;
552 raw_inode->i_mode = inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800553 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
554 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 raw_inode->i_nlinks = inode->i_nlink;
556 raw_inode->i_size = inode->i_size;
557 raw_inode->i_time = inode->i_mtime.tv_sec;
558 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
559 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
560 else for (i = 0; i < 9; i++)
561 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
562 mark_buffer_dirty(bh);
563 return bh;
564}
565
566/*
567 * The minix V2 function to synchronize an inode.
568 */
569static struct buffer_head * V2_minix_update_inode(struct inode * inode)
570{
571 struct buffer_head * bh;
572 struct minix2_inode * raw_inode;
573 struct minix_inode_info *minix_inode = minix_i(inode);
574 int i;
575
576 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
577 if (!raw_inode)
578 return NULL;
579 raw_inode->i_mode = inode->i_mode;
Eric W. Biedermanf303bdc2012-02-10 11:45:03 -0800580 raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode));
581 raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 raw_inode->i_nlinks = inode->i_nlink;
583 raw_inode->i_size = inode->i_size;
584 raw_inode->i_mtime = inode->i_mtime.tv_sec;
585 raw_inode->i_atime = inode->i_atime.tv_sec;
586 raw_inode->i_ctime = inode->i_ctime.tv_sec;
587 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
588 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
589 else for (i = 0; i < 10; i++)
590 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
591 mark_buffer_dirty(bh);
592 return bh;
593}
594
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100595static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
597 int err = 0;
598 struct buffer_head *bh;
599
Al Viro0d7916d2009-06-07 15:21:06 -0400600 if (INODE_VERSION(inode) == MINIX_V1)
601 bh = V1_minix_update_inode(inode);
602 else
603 bh = V2_minix_update_inode(inode);
604 if (!bh)
605 return -EIO;
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100606 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 sync_dirty_buffer(bh);
Al Viro0d7916d2009-06-07 15:21:06 -0400608 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800609 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 inode->i_sb->s_id, inode->i_ino);
Al Viro0d7916d2009-06-07 15:21:06 -0400611 err = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 }
613 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 brelse (bh);
615 return err;
616}
617
618int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
619{
Al Viro2def9e42011-07-16 17:43:09 -0400620 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 generic_fillattr(dentry->d_inode, stat);
622 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800623 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 else
Andries Brouwer939b00d2007-02-12 00:52:49 -0800625 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
626 stat->blksize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 return 0;
628}
629
630/*
631 * The function that is called for file truncation.
632 */
633void minix_truncate(struct inode * inode)
634{
635 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
636 return;
637 if (INODE_VERSION(inode) == MINIX_V1)
638 V1_minix_truncate(inode);
639 else
640 V2_minix_truncate(inode);
641}
642
Al Viro152a0832010-07-25 00:46:55 +0400643static struct dentry *minix_mount(struct file_system_type *fs_type,
644 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645{
Al Viro152a0832010-07-25 00:46:55 +0400646 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647}
648
649static struct file_system_type minix_fs_type = {
650 .owner = THIS_MODULE,
651 .name = "minix",
Al Viro152a0832010-07-25 00:46:55 +0400652 .mount = minix_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 .kill_sb = kill_block_super,
654 .fs_flags = FS_REQUIRES_DEV,
655};
656
657static int __init init_minix_fs(void)
658{
659 int err = init_inodecache();
660 if (err)
661 goto out1;
662 err = register_filesystem(&minix_fs_type);
663 if (err)
664 goto out;
665 return 0;
666out:
667 destroy_inodecache();
668out1:
669 return err;
670}
671
672static void __exit exit_minix_fs(void)
673{
674 unregister_filesystem(&minix_fs_type);
675 destroy_inodecache();
676}
677
678module_init(init_minix_fs)
679module_exit(exit_minix_fs)
680MODULE_LICENSE("GPL");
681