blob: 64cdcd662ffccca98fecad85103f10a2348a76bc [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 Pigginfa0d7e32011-01-07 17:49:49 +110071static void minix_i_callback(struct rcu_head *head)
72{
73 struct inode *inode = container_of(head, struct inode, i_rcu);
74 INIT_LIST_HEAD(&inode->i_dentry);
75 kmem_cache_free(minix_inode_cachep, minix_i(inode));
76}
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078static void minix_destroy_inode(struct inode *inode)
79{
Nick Pigginfa0d7e32011-01-07 17:49:49 +110080 call_rcu(&inode->i_rcu, minix_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
82
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070083static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
85 struct minix_inode_info *ei = (struct minix_inode_info *) foo;
86
Christoph Lametera35afb82007-05-16 22:10:57 -070087 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
Paul Mundt20c2df82007-07-20 10:11:58 +090089
Linus Torvalds1da177e2005-04-16 15:20:36 -070090static int init_inodecache(void)
91{
92 minix_inode_cachep = kmem_cache_create("minix_inode_cache",
93 sizeof(struct minix_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -080094 0, (SLAB_RECLAIM_ACCOUNT|
95 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +090096 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 if (minix_inode_cachep == NULL)
98 return -ENOMEM;
99 return 0;
100}
101
102static void destroy_inodecache(void)
103{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700104 kmem_cache_destroy(minix_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800107static const struct super_operations minix_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 .alloc_inode = minix_alloc_inode,
109 .destroy_inode = minix_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 .write_inode = minix_write_inode,
Al Viro5ccb4a72010-06-04 22:27:38 -0400111 .evict_inode = minix_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 .put_super = minix_put_super,
113 .statfs = minix_statfs,
114 .remount_fs = minix_remount,
115};
116
117static int minix_remount (struct super_block * sb, int * flags, char * data)
118{
119 struct minix_sb_info * sbi = minix_sb(sb);
120 struct minix_super_block * ms;
121
122 ms = sbi->s_ms;
123 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
124 return 0;
125 if (*flags & MS_RDONLY) {
126 if (ms->s_state & MINIX_VALID_FS ||
127 !(sbi->s_mount_state & MINIX_VALID_FS))
128 return 0;
129 /* Mounting a rw partition read-only. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800130 if (sbi->s_version != MINIX_V3)
131 ms->s_state = sbi->s_mount_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 mark_buffer_dirty(sbi->s_sbh);
133 } else {
134 /* Mount a partition which is read-only, read-write. */
Andries Brouwer939b00d2007-02-12 00:52:49 -0800135 if (sbi->s_version != MINIX_V3) {
136 sbi->s_mount_state = ms->s_state;
137 ms->s_state &= ~MINIX_VALID_FS;
138 } else {
139 sbi->s_mount_state = MINIX_VALID_FS;
140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 mark_buffer_dirty(sbi->s_sbh);
142
143 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800144 printk("MINIX-fs warning: remounting unchecked fs, "
145 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 else if ((sbi->s_mount_state & MINIX_ERROR_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800147 printk("MINIX-fs warning: remounting fs with errors, "
148 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
150 return 0;
151}
152
153static int minix_fill_super(struct super_block *s, void *data, int silent)
154{
155 struct buffer_head *bh;
156 struct buffer_head **map;
157 struct minix_super_block *ms;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800158 struct minix3_super_block *m3s = NULL;
159 unsigned long i, block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 struct inode *root_inode;
161 struct minix_sb_info *sbi;
David Howellsa90a0882008-02-07 00:15:44 -0800162 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700164 sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (!sbi)
166 return -ENOMEM;
167 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Alexey Dobriyan2ecd05a2006-10-11 01:22:05 -0700169 BUILD_BUG_ON(32 != sizeof (struct minix_inode));
170 BUILD_BUG_ON(64 != sizeof(struct minix2_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 if (!sb_set_blocksize(s, BLOCK_SIZE))
173 goto out_bad_hblock;
174
175 if (!(bh = sb_bread(s, 1)))
176 goto out_bad_sb;
177
178 ms = (struct minix_super_block *) bh->b_data;
179 sbi->s_ms = ms;
180 sbi->s_sbh = bh;
181 sbi->s_mount_state = ms->s_state;
182 sbi->s_ninodes = ms->s_ninodes;
183 sbi->s_nzones = ms->s_nzones;
184 sbi->s_imap_blocks = ms->s_imap_blocks;
185 sbi->s_zmap_blocks = ms->s_zmap_blocks;
186 sbi->s_firstdatazone = ms->s_firstdatazone;
187 sbi->s_log_zone_size = ms->s_log_zone_size;
188 sbi->s_max_size = ms->s_max_size;
189 s->s_magic = ms->s_magic;
190 if (s->s_magic == MINIX_SUPER_MAGIC) {
191 sbi->s_version = MINIX_V1;
192 sbi->s_dirsize = 16;
193 sbi->s_namelen = 14;
194 sbi->s_link_max = MINIX_LINK_MAX;
195 } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
196 sbi->s_version = MINIX_V1;
197 sbi->s_dirsize = 32;
198 sbi->s_namelen = 30;
199 sbi->s_link_max = MINIX_LINK_MAX;
200 } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
201 sbi->s_version = MINIX_V2;
202 sbi->s_nzones = ms->s_zones;
203 sbi->s_dirsize = 16;
204 sbi->s_namelen = 14;
205 sbi->s_link_max = MINIX2_LINK_MAX;
206 } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
207 sbi->s_version = MINIX_V2;
208 sbi->s_nzones = ms->s_zones;
209 sbi->s_dirsize = 32;
210 sbi->s_namelen = 30;
211 sbi->s_link_max = MINIX2_LINK_MAX;
Andries Brouwer939b00d2007-02-12 00:52:49 -0800212 } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
213 m3s = (struct minix3_super_block *) bh->b_data;
214 s->s_magic = m3s->s_magic;
215 sbi->s_imap_blocks = m3s->s_imap_blocks;
216 sbi->s_zmap_blocks = m3s->s_zmap_blocks;
217 sbi->s_firstdatazone = m3s->s_firstdatazone;
218 sbi->s_log_zone_size = m3s->s_log_zone_size;
219 sbi->s_max_size = m3s->s_max_size;
220 sbi->s_ninodes = m3s->s_ninodes;
221 sbi->s_nzones = m3s->s_zones;
222 sbi->s_dirsize = 64;
223 sbi->s_namelen = 60;
224 sbi->s_version = MINIX_V3;
225 sbi->s_link_max = MINIX2_LINK_MAX;
226 sbi->s_mount_state = MINIX_VALID_FS;
227 sb_set_blocksize(s, m3s->s_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 } else
229 goto out_no_fs;
230
231 /*
232 * Allocate the buffer map to keep the superblock small.
233 */
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700234 if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0)
235 goto out_illegal_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700237 map = kzalloc(i, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 if (!map)
239 goto out_no_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 sbi->s_imap = &map[0];
241 sbi->s_zmap = &map[sbi->s_imap_blocks];
242
243 block=2;
244 for (i=0 ; i < sbi->s_imap_blocks ; i++) {
245 if (!(sbi->s_imap[i]=sb_bread(s, block)))
246 goto out_no_bitmap;
247 block++;
248 }
249 for (i=0 ; i < sbi->s_zmap_blocks ; i++) {
250 if (!(sbi->s_zmap[i]=sb_bread(s, block)))
251 goto out_no_bitmap;
252 block++;
253 }
254
255 minix_set_bit(0,sbi->s_imap[0]->b_data);
256 minix_set_bit(0,sbi->s_zmap[0]->b_data);
257
258 /* set up enough so that it can read an inode */
259 s->s_op = &minix_sops;
David Howellsa90a0882008-02-07 00:15:44 -0800260 root_inode = minix_iget(s, MINIX_ROOT_INO);
261 if (IS_ERR(root_inode)) {
262 ret = PTR_ERR(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 goto out_no_root;
David Howellsa90a0882008-02-07 00:15:44 -0800264 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
David Howellsa90a0882008-02-07 00:15:44 -0800266 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 s->s_root = d_alloc_root(root_inode);
268 if (!s->s_root)
269 goto out_iput;
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 if (!(s->s_flags & MS_RDONLY)) {
Andries Brouwer939b00d2007-02-12 00:52:49 -0800272 if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */
273 ms->s_state &= ~MINIX_VALID_FS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 mark_buffer_dirty(bh);
275 }
276 if (!(sbi->s_mount_state & MINIX_VALID_FS))
Denis Vlasenko11b84482006-03-25 03:07:42 -0800277 printk("MINIX-fs: mounting unchecked file system, "
278 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 else if (sbi->s_mount_state & MINIX_ERROR_FS)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800280 printk("MINIX-fs: mounting file system with errors, "
281 "running fsck is recommended\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return 0;
283
284out_iput:
285 iput(root_inode);
286 goto out_freemap;
287
288out_no_root:
289 if (!silent)
290 printk("MINIX-fs: get root inode failed\n");
291 goto out_freemap;
292
293out_no_bitmap:
294 printk("MINIX-fs: bad superblock or unable to read bitmaps\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700295out_freemap:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 for (i = 0; i < sbi->s_imap_blocks; i++)
297 brelse(sbi->s_imap[i]);
298 for (i = 0; i < sbi->s_zmap_blocks; i++)
299 brelse(sbi->s_zmap[i]);
300 kfree(sbi->s_imap);
301 goto out_release;
302
303out_no_map:
David Howellsa90a0882008-02-07 00:15:44 -0800304 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 if (!silent)
Denis Vlasenko11b84482006-03-25 03:07:42 -0800306 printk("MINIX-fs: can't allocate map\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 goto out_release;
308
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700309out_illegal_sb:
310 if (!silent)
311 printk("MINIX-fs: bad superblock\n");
312 goto out_release;
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314out_no_fs:
315 if (!silent)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800316 printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 "
317 "on device %s.\n", s->s_id);
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700318out_release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 brelse(bh);
320 goto out;
321
322out_bad_hblock:
Denis Vlasenko11b84482006-03-25 03:07:42 -0800323 printk("MINIX-fs: blocksize too small for device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 goto out;
325
326out_bad_sb:
327 printk("MINIX-fs: unable to read superblock\n");
Andries Brouwerf5fb09f2006-08-27 01:23:42 -0700328out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 s->s_fs_info = NULL;
330 kfree(sbi);
David Howellsa90a0882008-02-07 00:15:44 -0800331 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332}
333
David Howells726c3342006-06-23 02:02:58 -0700334static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335{
Coly Li054475d2009-04-02 16:59:39 -0700336 struct super_block *sb = dentry->d_sb;
337 struct minix_sb_info *sbi = minix_sb(sb);
338 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
339 buf->f_type = sb->s_magic;
340 buf->f_bsize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size;
342 buf->f_bfree = minix_count_free_blocks(sbi);
343 buf->f_bavail = buf->f_bfree;
344 buf->f_files = sbi->s_ninodes;
345 buf->f_ffree = minix_count_free_inodes(sbi);
346 buf->f_namelen = sbi->s_namelen;
Coly Li054475d2009-04-02 16:59:39 -0700347 buf->f_fsid.val[0] = (u32)id;
348 buf->f_fsid.val[1] = (u32)(id >> 32);
349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return 0;
351}
352
353static int minix_get_block(struct inode *inode, sector_t block,
354 struct buffer_head *bh_result, int create)
355{
356 if (INODE_VERSION(inode) == MINIX_V1)
357 return V1_minix_get_block(inode, block, bh_result, create);
358 else
359 return V2_minix_get_block(inode, block, bh_result, create);
360}
361
362static int minix_writepage(struct page *page, struct writeback_control *wbc)
363{
364 return block_write_full_page(page, minix_get_block, wbc);
365}
Nick Piggin4a66af92007-10-16 01:25:21 -0700366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367static int minix_readpage(struct file *file, struct page *page)
368{
369 return block_read_full_page(page,minix_get_block);
370}
Nick Piggin4a66af92007-10-16 01:25:21 -0700371
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200372int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
Christoph Hellwig6e1db882010-06-04 11:29:57 +0200374 return __block_write_begin(page, pos, len, minix_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
Nick Piggin4a66af92007-10-16 01:25:21 -0700376
377static int minix_write_begin(struct file *file, struct address_space *mapping,
378 loff_t pos, unsigned len, unsigned flags,
379 struct page **pagep, void **fsdata)
380{
Christoph Hellwig155130a2010-06-04 11:29:58 +0200381 int ret;
382
383 ret = block_write_begin(mapping, pos, len, flags, pagep,
Christoph Hellwigf4e420d2010-06-04 11:29:56 +0200384 minix_get_block);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200385 if (unlikely(ret)) {
386 loff_t isize = mapping->host->i_size;
387 if (pos + len > isize)
388 vmtruncate(mapping->host, isize);
389 }
390
391 return ret;
Nick Piggin4a66af92007-10-16 01:25:21 -0700392}
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394static sector_t minix_bmap(struct address_space *mapping, sector_t block)
395{
396 return generic_block_bmap(mapping,block,minix_get_block);
397}
Nick Piggin4a66af92007-10-16 01:25:21 -0700398
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700399static const struct address_space_operations minix_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 .readpage = minix_readpage,
401 .writepage = minix_writepage,
Nick Piggin4a66af92007-10-16 01:25:21 -0700402 .write_begin = minix_write_begin,
403 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 .bmap = minix_bmap
405};
406
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800407static const struct inode_operations minix_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 .readlink = generic_readlink,
409 .follow_link = page_follow_link_light,
410 .put_link = page_put_link,
411 .getattr = minix_getattr,
412};
413
414void minix_set_inode(struct inode *inode, dev_t rdev)
415{
416 if (S_ISREG(inode->i_mode)) {
417 inode->i_op = &minix_file_inode_operations;
418 inode->i_fop = &minix_file_operations;
419 inode->i_mapping->a_ops = &minix_aops;
420 } else if (S_ISDIR(inode->i_mode)) {
421 inode->i_op = &minix_dir_inode_operations;
422 inode->i_fop = &minix_dir_operations;
423 inode->i_mapping->a_ops = &minix_aops;
424 } else if (S_ISLNK(inode->i_mode)) {
425 inode->i_op = &minix_symlink_inode_operations;
426 inode->i_mapping->a_ops = &minix_aops;
427 } else
428 init_special_inode(inode, inode->i_mode, rdev);
429}
430
431/*
432 * The minix V1 function to read an inode.
433 */
David Howellsa90a0882008-02-07 00:15:44 -0800434static struct inode *V1_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
436 struct buffer_head * bh;
437 struct minix_inode * raw_inode;
438 struct minix_inode_info *minix_inode = minix_i(inode);
439 int i;
440
441 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
442 if (!raw_inode) {
David Howellsa90a0882008-02-07 00:15:44 -0800443 iget_failed(inode);
444 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 }
446 inode->i_mode = raw_inode->i_mode;
447 inode->i_uid = (uid_t)raw_inode->i_uid;
448 inode->i_gid = (gid_t)raw_inode->i_gid;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200449 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 inode->i_size = raw_inode->i_size;
451 inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time;
452 inode->i_mtime.tv_nsec = 0;
453 inode->i_atime.tv_nsec = 0;
454 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700455 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 for (i = 0; i < 9; i++)
457 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
458 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
459 brelse(bh);
David Howellsa90a0882008-02-07 00:15:44 -0800460 unlock_new_inode(inode);
461 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462}
463
464/*
465 * The minix V2 function to read an inode.
466 */
David Howellsa90a0882008-02-07 00:15:44 -0800467static struct inode *V2_minix_iget(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468{
469 struct buffer_head * bh;
470 struct minix2_inode * raw_inode;
471 struct minix_inode_info *minix_inode = minix_i(inode);
472 int i;
473
474 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
475 if (!raw_inode) {
David Howellsa90a0882008-02-07 00:15:44 -0800476 iget_failed(inode);
477 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
479 inode->i_mode = raw_inode->i_mode;
480 inode->i_uid = (uid_t)raw_inode->i_uid;
481 inode->i_gid = (gid_t)raw_inode->i_gid;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200482 set_nlink(inode, raw_inode->i_nlinks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 inode->i_size = raw_inode->i_size;
484 inode->i_mtime.tv_sec = raw_inode->i_mtime;
485 inode->i_atime.tv_sec = raw_inode->i_atime;
486 inode->i_ctime.tv_sec = raw_inode->i_ctime;
487 inode->i_mtime.tv_nsec = 0;
488 inode->i_atime.tv_nsec = 0;
489 inode->i_ctime.tv_nsec = 0;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700490 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 for (i = 0; i < 10; i++)
492 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
493 minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
494 brelse(bh);
David Howellsa90a0882008-02-07 00:15:44 -0800495 unlock_new_inode(inode);
496 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497}
498
499/*
500 * The global function to read an inode.
501 */
David Howellsa90a0882008-02-07 00:15:44 -0800502struct inode *minix_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503{
David Howellsa90a0882008-02-07 00:15:44 -0800504 struct inode *inode;
505
506 inode = iget_locked(sb, ino);
507 if (!inode)
508 return ERR_PTR(-ENOMEM);
509 if (!(inode->i_state & I_NEW))
510 return inode;
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 if (INODE_VERSION(inode) == MINIX_V1)
David Howellsa90a0882008-02-07 00:15:44 -0800513 return V1_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 else
David Howellsa90a0882008-02-07 00:15:44 -0800515 return V2_minix_iget(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516}
517
518/*
519 * The minix V1 function to synchronize an inode.
520 */
521static struct buffer_head * V1_minix_update_inode(struct inode * inode)
522{
523 struct buffer_head * bh;
524 struct minix_inode * raw_inode;
525 struct minix_inode_info *minix_inode = minix_i(inode);
526 int i;
527
528 raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
529 if (!raw_inode)
530 return NULL;
531 raw_inode->i_mode = inode->i_mode;
532 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
533 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
534 raw_inode->i_nlinks = inode->i_nlink;
535 raw_inode->i_size = inode->i_size;
536 raw_inode->i_time = inode->i_mtime.tv_sec;
537 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
538 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
539 else for (i = 0; i < 9; i++)
540 raw_inode->i_zone[i] = minix_inode->u.i1_data[i];
541 mark_buffer_dirty(bh);
542 return bh;
543}
544
545/*
546 * The minix V2 function to synchronize an inode.
547 */
548static struct buffer_head * V2_minix_update_inode(struct inode * inode)
549{
550 struct buffer_head * bh;
551 struct minix2_inode * raw_inode;
552 struct minix_inode_info *minix_inode = minix_i(inode);
553 int i;
554
555 raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
556 if (!raw_inode)
557 return NULL;
558 raw_inode->i_mode = inode->i_mode;
559 raw_inode->i_uid = fs_high2lowuid(inode->i_uid);
560 raw_inode->i_gid = fs_high2lowgid(inode->i_gid);
561 raw_inode->i_nlinks = inode->i_nlink;
562 raw_inode->i_size = inode->i_size;
563 raw_inode->i_mtime = inode->i_mtime.tv_sec;
564 raw_inode->i_atime = inode->i_atime.tv_sec;
565 raw_inode->i_ctime = inode->i_ctime.tv_sec;
566 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
567 raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev);
568 else for (i = 0; i < 10; i++)
569 raw_inode->i_zone[i] = minix_inode->u.i2_data[i];
570 mark_buffer_dirty(bh);
571 return bh;
572}
573
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100574static int minix_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575{
576 int err = 0;
577 struct buffer_head *bh;
578
Al Viro0d7916d2009-06-07 15:21:06 -0400579 if (INODE_VERSION(inode) == MINIX_V1)
580 bh = V1_minix_update_inode(inode);
581 else
582 bh = V2_minix_update_inode(inode);
583 if (!bh)
584 return -EIO;
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100585 if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 sync_dirty_buffer(bh);
Al Viro0d7916d2009-06-07 15:21:06 -0400587 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Denis Vlasenko11b84482006-03-25 03:07:42 -0800588 printk("IO error syncing minix inode [%s:%08lx]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 inode->i_sb->s_id, inode->i_ino);
Al Viro0d7916d2009-06-07 15:21:06 -0400590 err = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 }
592 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 brelse (bh);
594 return err;
595}
596
597int minix_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
598{
Al Viro2def9e42011-07-16 17:43:09 -0400599 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 generic_fillattr(dentry->d_inode, stat);
601 if (INODE_VERSION(dentry->d_inode) == MINIX_V1)
Andries Brouwer939b00d2007-02-12 00:52:49 -0800602 stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 else
Andries Brouwer939b00d2007-02-12 00:52:49 -0800604 stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb);
605 stat->blksize = sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 return 0;
607}
608
609/*
610 * The function that is called for file truncation.
611 */
612void minix_truncate(struct inode * inode)
613{
614 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)))
615 return;
616 if (INODE_VERSION(inode) == MINIX_V1)
617 V1_minix_truncate(inode);
618 else
619 V2_minix_truncate(inode);
620}
621
Al Viro152a0832010-07-25 00:46:55 +0400622static struct dentry *minix_mount(struct file_system_type *fs_type,
623 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
Al Viro152a0832010-07-25 00:46:55 +0400625 return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626}
627
628static struct file_system_type minix_fs_type = {
629 .owner = THIS_MODULE,
630 .name = "minix",
Al Viro152a0832010-07-25 00:46:55 +0400631 .mount = minix_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 .kill_sb = kill_block_super,
633 .fs_flags = FS_REQUIRES_DEV,
634};
635
636static int __init init_minix_fs(void)
637{
638 int err = init_inodecache();
639 if (err)
640 goto out1;
641 err = register_filesystem(&minix_fs_type);
642 if (err)
643 goto out;
644 return 0;
645out:
646 destroy_inodecache();
647out1:
648 return err;
649}
650
651static void __exit exit_minix_fs(void)
652{
653 unregister_filesystem(&minix_fs_type);
654 destroy_inodecache();
655}
656
657module_init(init_minix_fs)
658module_exit(exit_minix_fs)
659MODULE_LICENSE("GPL");
660