]>
Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/minix/inode.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * | |
f762dd68 | 7 | * Copyright (C) 1996 Gertjan van Wingerde |
1da177e4 LT |
8 | * Minix V2 fs support. |
9 | * | |
10 | * Modified for 680x0 by Andreas Schwab | |
939b00df | 11 | * Updated to filesystem version 3 by Daniel Aragones |
1da177e4 LT |
12 | */ |
13 | ||
14 | #include <linux/module.h> | |
15 | #include "minix.h" | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/highuid.h> | |
20 | #include <linux/vfs.h> | |
a9185b41 | 21 | #include <linux/writeback.h> |
1da177e4 | 22 | |
a9185b41 CH |
23 | static int minix_write_inode(struct inode *inode, |
24 | struct writeback_control *wbc); | |
726c3342 | 25 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 LT |
26 | static int minix_remount (struct super_block * sb, int * flags, char * data); |
27 | ||
5ccb4a78 | 28 | static void minix_evict_inode(struct inode *inode) |
1da177e4 | 29 | { |
91b0abe3 | 30 | truncate_inode_pages_final(&inode->i_data); |
5ccb4a78 AV |
31 | if (!inode->i_nlink) { |
32 | inode->i_size = 0; | |
33 | minix_truncate(inode); | |
34 | } | |
35 | invalidate_inode_buffers(inode); | |
dbd5768f | 36 | clear_inode(inode); |
5ccb4a78 AV |
37 | if (!inode->i_nlink) |
38 | minix_free_inode(inode); | |
1da177e4 LT |
39 | } |
40 | ||
41 | static void minix_put_super(struct super_block *sb) | |
42 | { | |
43 | int i; | |
44 | struct minix_sb_info *sbi = minix_sb(sb); | |
45 | ||
bc98a42c | 46 | if (!sb_rdonly(sb)) { |
939b00df AB |
47 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
48 | sbi->s_ms->s_state = sbi->s_mount_state; | |
1da177e4 LT |
49 | mark_buffer_dirty(sbi->s_sbh); |
50 | } | |
51 | for (i = 0; i < sbi->s_imap_blocks; i++) | |
52 | brelse(sbi->s_imap[i]); | |
53 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
54 | brelse(sbi->s_zmap[i]); | |
55 | brelse (sbi->s_sbh); | |
56 | kfree(sbi->s_imap); | |
57 | sb->s_fs_info = NULL; | |
58 | kfree(sbi); | |
1da177e4 LT |
59 | } |
60 | ||
e18b890b | 61 | static struct kmem_cache * minix_inode_cachep; |
1da177e4 LT |
62 | |
63 | static struct inode *minix_alloc_inode(struct super_block *sb) | |
64 | { | |
65 | struct minix_inode_info *ei; | |
83b08bf7 | 66 | ei = kmem_cache_alloc(minix_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
67 | if (!ei) |
68 | return NULL; | |
69 | return &ei->vfs_inode; | |
70 | } | |
71 | ||
d67a398a | 72 | static void minix_free_in_core_inode(struct inode *inode) |
1da177e4 LT |
73 | { |
74 | kmem_cache_free(minix_inode_cachep, minix_i(inode)); | |
75 | } | |
76 | ||
51cc5068 | 77 | static void init_once(void *foo) |
1da177e4 LT |
78 | { |
79 | struct minix_inode_info *ei = (struct minix_inode_info *) foo; | |
80 | ||
a35afb83 | 81 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 82 | } |
20c2df83 | 83 | |
84ee353d | 84 | static int __init init_inodecache(void) |
1da177e4 LT |
85 | { |
86 | minix_inode_cachep = kmem_cache_create("minix_inode_cache", | |
87 | sizeof(struct minix_inode_info), | |
fffb60f9 | 88 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 89 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 90 | init_once); |
1da177e4 LT |
91 | if (minix_inode_cachep == NULL) |
92 | return -ENOMEM; | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static void destroy_inodecache(void) | |
97 | { | |
8c0a8537 KS |
98 | /* |
99 | * Make sure all delayed rcu free inodes are flushed before we | |
100 | * destroy cache. | |
101 | */ | |
102 | rcu_barrier(); | |
1a1d92c1 | 103 | kmem_cache_destroy(minix_inode_cachep); |
1da177e4 LT |
104 | } |
105 | ||
ee9b6d61 | 106 | static const struct super_operations minix_sops = { |
1da177e4 | 107 | .alloc_inode = minix_alloc_inode, |
d67a398a | 108 | .free_inode = minix_free_in_core_inode, |
1da177e4 | 109 | .write_inode = minix_write_inode, |
5ccb4a78 | 110 | .evict_inode = minix_evict_inode, |
1da177e4 LT |
111 | .put_super = minix_put_super, |
112 | .statfs = minix_statfs, | |
113 | .remount_fs = minix_remount, | |
114 | }; | |
115 | ||
116 | static 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 | ||
02b9984d | 121 | sync_filesystem(sb); |
1da177e4 | 122 | ms = sbi->s_ms; |
1751e8a6 | 123 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
1da177e4 | 124 | return 0; |
1751e8a6 | 125 | if (*flags & SB_RDONLY) { |
1da177e4 LT |
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. */ | |
939b00df AB |
130 | if (sbi->s_version != MINIX_V3) |
131 | ms->s_state = sbi->s_mount_state; | |
1da177e4 LT |
132 | mark_buffer_dirty(sbi->s_sbh); |
133 | } else { | |
134 | /* Mount a partition which is read-only, read-write. */ | |
939b00df AB |
135 | 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 | } | |
1da177e4 LT |
141 | mark_buffer_dirty(sbi->s_sbh); |
142 | ||
143 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
11b84487 DV |
144 | printk("MINIX-fs warning: remounting unchecked fs, " |
145 | "running fsck is recommended\n"); | |
1da177e4 | 146 | else if ((sbi->s_mount_state & MINIX_ERROR_FS)) |
11b84487 DV |
147 | printk("MINIX-fs warning: remounting fs with errors, " |
148 | "running fsck is recommended\n"); | |
1da177e4 LT |
149 | } |
150 | return 0; | |
151 | } | |
152 | ||
32ac86ef | 153 | static bool minix_check_superblock(struct super_block *sb) |
270ef410 | 154 | { |
32ac86ef EB |
155 | struct minix_sb_info *sbi = minix_sb(sb); |
156 | ||
270ef410 EB |
157 | if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) |
158 | return false; | |
159 | ||
160 | /* | |
161 | * s_max_size must not exceed the block mapping limitation. This check | |
162 | * is only needed for V1 filesystems, since V2/V3 support an extra level | |
163 | * of indirect blocks which places the limit well above U32_MAX. | |
164 | */ | |
165 | if (sbi->s_version == MINIX_V1 && | |
32ac86ef | 166 | sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE) |
270ef410 EB |
167 | return false; |
168 | ||
169 | return true; | |
170 | } | |
171 | ||
1da177e4 LT |
172 | static int minix_fill_super(struct super_block *s, void *data, int silent) |
173 | { | |
174 | struct buffer_head *bh; | |
175 | struct buffer_head **map; | |
176 | struct minix_super_block *ms; | |
939b00df AB |
177 | struct minix3_super_block *m3s = NULL; |
178 | unsigned long i, block; | |
1da177e4 LT |
179 | struct inode *root_inode; |
180 | struct minix_sb_info *sbi; | |
a90a0880 | 181 | int ret = -EINVAL; |
1da177e4 | 182 | |
f8314dc6 | 183 | sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); |
1da177e4 LT |
184 | if (!sbi) |
185 | return -ENOMEM; | |
186 | s->s_fs_info = sbi; | |
1da177e4 | 187 | |
2ecd05ae AD |
188 | BUILD_BUG_ON(32 != sizeof (struct minix_inode)); |
189 | BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); | |
1da177e4 LT |
190 | |
191 | if (!sb_set_blocksize(s, BLOCK_SIZE)) | |
192 | goto out_bad_hblock; | |
193 | ||
194 | if (!(bh = sb_bread(s, 1))) | |
195 | goto out_bad_sb; | |
196 | ||
197 | ms = (struct minix_super_block *) bh->b_data; | |
198 | sbi->s_ms = ms; | |
199 | sbi->s_sbh = bh; | |
200 | sbi->s_mount_state = ms->s_state; | |
201 | sbi->s_ninodes = ms->s_ninodes; | |
202 | sbi->s_nzones = ms->s_nzones; | |
203 | sbi->s_imap_blocks = ms->s_imap_blocks; | |
204 | sbi->s_zmap_blocks = ms->s_zmap_blocks; | |
205 | sbi->s_firstdatazone = ms->s_firstdatazone; | |
206 | sbi->s_log_zone_size = ms->s_log_zone_size; | |
32ac86ef | 207 | s->s_maxbytes = ms->s_max_size; |
1da177e4 LT |
208 | s->s_magic = ms->s_magic; |
209 | if (s->s_magic == MINIX_SUPER_MAGIC) { | |
210 | sbi->s_version = MINIX_V1; | |
211 | sbi->s_dirsize = 16; | |
212 | sbi->s_namelen = 14; | |
8de52778 | 213 | s->s_max_links = MINIX_LINK_MAX; |
1da177e4 LT |
214 | } else if (s->s_magic == MINIX_SUPER_MAGIC2) { |
215 | sbi->s_version = MINIX_V1; | |
216 | sbi->s_dirsize = 32; | |
217 | sbi->s_namelen = 30; | |
8de52778 | 218 | s->s_max_links = MINIX_LINK_MAX; |
1da177e4 LT |
219 | } else if (s->s_magic == MINIX2_SUPER_MAGIC) { |
220 | sbi->s_version = MINIX_V2; | |
221 | sbi->s_nzones = ms->s_zones; | |
222 | sbi->s_dirsize = 16; | |
223 | sbi->s_namelen = 14; | |
8de52778 | 224 | s->s_max_links = MINIX2_LINK_MAX; |
1da177e4 LT |
225 | } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { |
226 | sbi->s_version = MINIX_V2; | |
227 | sbi->s_nzones = ms->s_zones; | |
228 | sbi->s_dirsize = 32; | |
229 | sbi->s_namelen = 30; | |
8de52778 | 230 | s->s_max_links = MINIX2_LINK_MAX; |
939b00df AB |
231 | } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { |
232 | m3s = (struct minix3_super_block *) bh->b_data; | |
233 | s->s_magic = m3s->s_magic; | |
234 | sbi->s_imap_blocks = m3s->s_imap_blocks; | |
235 | sbi->s_zmap_blocks = m3s->s_zmap_blocks; | |
236 | sbi->s_firstdatazone = m3s->s_firstdatazone; | |
237 | sbi->s_log_zone_size = m3s->s_log_zone_size; | |
32ac86ef | 238 | s->s_maxbytes = m3s->s_max_size; |
939b00df AB |
239 | sbi->s_ninodes = m3s->s_ninodes; |
240 | sbi->s_nzones = m3s->s_zones; | |
241 | sbi->s_dirsize = 64; | |
242 | sbi->s_namelen = 60; | |
243 | sbi->s_version = MINIX_V3; | |
939b00df AB |
244 | sbi->s_mount_state = MINIX_VALID_FS; |
245 | sb_set_blocksize(s, m3s->s_blocksize); | |
8de52778 | 246 | s->s_max_links = MINIX2_LINK_MAX; |
1da177e4 LT |
247 | } else |
248 | goto out_no_fs; | |
249 | ||
32ac86ef | 250 | if (!minix_check_superblock(s)) |
270ef410 EB |
251 | goto out_illegal_sb; |
252 | ||
1da177e4 LT |
253 | /* |
254 | * Allocate the buffer map to keep the superblock small. | |
255 | */ | |
256 | i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); | |
f8314dc6 | 257 | map = kzalloc(i, GFP_KERNEL); |
1da177e4 LT |
258 | if (!map) |
259 | goto out_no_map; | |
1da177e4 LT |
260 | sbi->s_imap = &map[0]; |
261 | sbi->s_zmap = &map[sbi->s_imap_blocks]; | |
262 | ||
263 | block=2; | |
264 | for (i=0 ; i < sbi->s_imap_blocks ; i++) { | |
265 | if (!(sbi->s_imap[i]=sb_bread(s, block))) | |
266 | goto out_no_bitmap; | |
267 | block++; | |
268 | } | |
269 | for (i=0 ; i < sbi->s_zmap_blocks ; i++) { | |
270 | if (!(sbi->s_zmap[i]=sb_bread(s, block))) | |
271 | goto out_no_bitmap; | |
272 | block++; | |
273 | } | |
274 | ||
275 | minix_set_bit(0,sbi->s_imap[0]->b_data); | |
276 | minix_set_bit(0,sbi->s_zmap[0]->b_data); | |
277 | ||
016e8d44 JB |
278 | /* Apparently minix can create filesystems that allocate more blocks for |
279 | * the bitmaps than needed. We simply ignore that, but verify it didn't | |
280 | * create one with not enough blocks and bail out if so. | |
281 | */ | |
282 | block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); | |
283 | if (sbi->s_imap_blocks < block) { | |
284 | printk("MINIX-fs: file system does not have enough " | |
6d6747f8 | 285 | "imap blocks allocated. Refusing to mount.\n"); |
ca85c078 | 286 | goto out_no_bitmap; |
016e8d44 JB |
287 | } |
288 | ||
289 | block = minix_blocks_needed( | |
6d6747f8 | 290 | (sbi->s_nzones - sbi->s_firstdatazone + 1), |
016e8d44 JB |
291 | s->s_blocksize); |
292 | if (sbi->s_zmap_blocks < block) { | |
293 | printk("MINIX-fs: file system does not have enough " | |
294 | "zmap blocks allocated. Refusing to mount.\n"); | |
ca85c078 AV |
295 | goto out_no_bitmap; |
296 | } | |
297 | ||
298 | /* set up enough so that it can read an inode */ | |
299 | s->s_op = &minix_sops; | |
22b13969 DD |
300 | s->s_time_min = 0; |
301 | s->s_time_max = U32_MAX; | |
ca85c078 AV |
302 | root_inode = minix_iget(s, MINIX_ROOT_INO); |
303 | if (IS_ERR(root_inode)) { | |
304 | ret = PTR_ERR(root_inode); | |
305 | goto out_no_root; | |
016e8d44 JB |
306 | } |
307 | ||
d6042eac | 308 | ret = -ENOMEM; |
ca85c078 | 309 | s->s_root = d_make_root(root_inode); |
d6042eac | 310 | if (!s->s_root) |
ca85c078 | 311 | goto out_no_root; |
d6042eac | 312 | |
bc98a42c | 313 | if (!sb_rdonly(s)) { |
d6042eac AV |
314 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
315 | ms->s_state &= ~MINIX_VALID_FS; | |
316 | mark_buffer_dirty(bh); | |
317 | } | |
318 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
319 | printk("MINIX-fs: mounting unchecked file system, " | |
320 | "running fsck is recommended\n"); | |
321 | else if (sbi->s_mount_state & MINIX_ERROR_FS) | |
322 | printk("MINIX-fs: mounting file system with errors, " | |
323 | "running fsck is recommended\n"); | |
324 | ||
1da177e4 LT |
325 | return 0; |
326 | ||
1da177e4 LT |
327 | out_no_root: |
328 | if (!silent) | |
329 | printk("MINIX-fs: get root inode failed\n"); | |
330 | goto out_freemap; | |
331 | ||
332 | out_no_bitmap: | |
333 | printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); | |
f5fb09fa | 334 | out_freemap: |
1da177e4 LT |
335 | for (i = 0; i < sbi->s_imap_blocks; i++) |
336 | brelse(sbi->s_imap[i]); | |
337 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
338 | brelse(sbi->s_zmap[i]); | |
339 | kfree(sbi->s_imap); | |
340 | goto out_release; | |
341 | ||
342 | out_no_map: | |
a90a0880 | 343 | ret = -ENOMEM; |
1da177e4 | 344 | if (!silent) |
11b84487 | 345 | printk("MINIX-fs: can't allocate map\n"); |
1da177e4 LT |
346 | goto out_release; |
347 | ||
f5fb09fa AB |
348 | out_illegal_sb: |
349 | if (!silent) | |
350 | printk("MINIX-fs: bad superblock\n"); | |
351 | goto out_release; | |
352 | ||
1da177e4 LT |
353 | out_no_fs: |
354 | if (!silent) | |
939b00df AB |
355 | printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " |
356 | "on device %s.\n", s->s_id); | |
f5fb09fa | 357 | out_release: |
1da177e4 LT |
358 | brelse(bh); |
359 | goto out; | |
360 | ||
361 | out_bad_hblock: | |
11b84487 | 362 | printk("MINIX-fs: blocksize too small for device\n"); |
1da177e4 LT |
363 | goto out; |
364 | ||
365 | out_bad_sb: | |
366 | printk("MINIX-fs: unable to read superblock\n"); | |
f5fb09fa | 367 | out: |
1da177e4 LT |
368 | s->s_fs_info = NULL; |
369 | kfree(sbi); | |
a90a0880 | 370 | return ret; |
1da177e4 LT |
371 | } |
372 | ||
726c3342 | 373 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 374 | { |
054475d2 CL |
375 | struct super_block *sb = dentry->d_sb; |
376 | struct minix_sb_info *sbi = minix_sb(sb); | |
377 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
378 | buf->f_type = sb->s_magic; | |
379 | buf->f_bsize = sb->s_blocksize; | |
1da177e4 | 380 | buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; |
016e8d44 | 381 | buf->f_bfree = minix_count_free_blocks(sb); |
1da177e4 LT |
382 | buf->f_bavail = buf->f_bfree; |
383 | buf->f_files = sbi->s_ninodes; | |
016e8d44 | 384 | buf->f_ffree = minix_count_free_inodes(sb); |
1da177e4 | 385 | buf->f_namelen = sbi->s_namelen; |
6d1349c7 | 386 | buf->f_fsid = u64_to_fsid(id); |
054475d2 | 387 | |
1da177e4 LT |
388 | return 0; |
389 | } | |
390 | ||
391 | static int minix_get_block(struct inode *inode, sector_t block, | |
392 | struct buffer_head *bh_result, int create) | |
393 | { | |
394 | if (INODE_VERSION(inode) == MINIX_V1) | |
395 | return V1_minix_get_block(inode, block, bh_result, create); | |
396 | else | |
397 | return V2_minix_get_block(inode, block, bh_result, create); | |
398 | } | |
399 | ||
400 | static int minix_writepage(struct page *page, struct writeback_control *wbc) | |
401 | { | |
402 | return block_write_full_page(page, minix_get_block, wbc); | |
403 | } | |
4a66af9e | 404 | |
1da177e4 LT |
405 | static int minix_readpage(struct file *file, struct page *page) |
406 | { | |
407 | return block_read_full_page(page,minix_get_block); | |
408 | } | |
4a66af9e | 409 | |
f4e420dc | 410 | int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) |
1da177e4 | 411 | { |
6e1db88d | 412 | return __block_write_begin(page, pos, len, minix_get_block); |
1da177e4 | 413 | } |
4a66af9e | 414 | |
7fc7cd00 MS |
415 | static void minix_write_failed(struct address_space *mapping, loff_t to) |
416 | { | |
417 | struct inode *inode = mapping->host; | |
418 | ||
419 | if (to > inode->i_size) { | |
7caef267 | 420 | truncate_pagecache(inode, inode->i_size); |
7fc7cd00 MS |
421 | minix_truncate(inode); |
422 | } | |
423 | } | |
424 | ||
4a66af9e NP |
425 | static int minix_write_begin(struct file *file, struct address_space *mapping, |
426 | loff_t pos, unsigned len, unsigned flags, | |
427 | struct page **pagep, void **fsdata) | |
428 | { | |
155130a4 CH |
429 | int ret; |
430 | ||
431 | ret = block_write_begin(mapping, pos, len, flags, pagep, | |
f4e420dc | 432 | minix_get_block); |
7fc7cd00 MS |
433 | if (unlikely(ret)) |
434 | minix_write_failed(mapping, pos + len); | |
155130a4 CH |
435 | |
436 | return ret; | |
4a66af9e NP |
437 | } |
438 | ||
1da177e4 LT |
439 | static sector_t minix_bmap(struct address_space *mapping, sector_t block) |
440 | { | |
441 | return generic_block_bmap(mapping,block,minix_get_block); | |
442 | } | |
4a66af9e | 443 | |
f5e54d6e | 444 | static const struct address_space_operations minix_aops = { |
0af57378 | 445 | .set_page_dirty = __set_page_dirty_buffers, |
1da177e4 LT |
446 | .readpage = minix_readpage, |
447 | .writepage = minix_writepage, | |
4a66af9e NP |
448 | .write_begin = minix_write_begin, |
449 | .write_end = generic_write_end, | |
1da177e4 LT |
450 | .bmap = minix_bmap |
451 | }; | |
452 | ||
92e1d5be | 453 | static const struct inode_operations minix_symlink_inode_operations = { |
6b255391 | 454 | .get_link = page_get_link, |
1da177e4 LT |
455 | .getattr = minix_getattr, |
456 | }; | |
457 | ||
458 | void minix_set_inode(struct inode *inode, dev_t rdev) | |
459 | { | |
460 | if (S_ISREG(inode->i_mode)) { | |
461 | inode->i_op = &minix_file_inode_operations; | |
462 | inode->i_fop = &minix_file_operations; | |
463 | inode->i_mapping->a_ops = &minix_aops; | |
464 | } else if (S_ISDIR(inode->i_mode)) { | |
465 | inode->i_op = &minix_dir_inode_operations; | |
466 | inode->i_fop = &minix_dir_operations; | |
467 | inode->i_mapping->a_ops = &minix_aops; | |
468 | } else if (S_ISLNK(inode->i_mode)) { | |
469 | inode->i_op = &minix_symlink_inode_operations; | |
21fc61c7 | 470 | inode_nohighmem(inode); |
1da177e4 LT |
471 | inode->i_mapping->a_ops = &minix_aops; |
472 | } else | |
473 | init_special_inode(inode, inode->i_mode, rdev); | |
474 | } | |
475 | ||
476 | /* | |
477 | * The minix V1 function to read an inode. | |
478 | */ | |
a90a0880 | 479 | static struct inode *V1_minix_iget(struct inode *inode) |
1da177e4 LT |
480 | { |
481 | struct buffer_head * bh; | |
482 | struct minix_inode * raw_inode; | |
483 | struct minix_inode_info *minix_inode = minix_i(inode); | |
484 | int i; | |
485 | ||
486 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
487 | if (!raw_inode) { | |
a90a0880 DH |
488 | iget_failed(inode); |
489 | return ERR_PTR(-EIO); | |
1da177e4 | 490 | } |
facb03dd EB |
491 | if (raw_inode->i_nlinks == 0) { |
492 | printk("MINIX-fs: deleted inode referenced: %lu\n", | |
493 | inode->i_ino); | |
494 | brelse(bh); | |
495 | iget_failed(inode); | |
496 | return ERR_PTR(-ESTALE); | |
497 | } | |
1da177e4 | 498 | inode->i_mode = raw_inode->i_mode; |
f303bdc5 EB |
499 | i_uid_write(inode, raw_inode->i_uid); |
500 | i_gid_write(inode, raw_inode->i_gid); | |
bfe86848 | 501 | set_nlink(inode, raw_inode->i_nlinks); |
1da177e4 LT |
502 | inode->i_size = raw_inode->i_size; |
503 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; | |
504 | inode->i_mtime.tv_nsec = 0; | |
505 | inode->i_atime.tv_nsec = 0; | |
506 | inode->i_ctime.tv_nsec = 0; | |
ba52de12 | 507 | inode->i_blocks = 0; |
1da177e4 LT |
508 | for (i = 0; i < 9; i++) |
509 | minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; | |
510 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
511 | brelse(bh); | |
a90a0880 DH |
512 | unlock_new_inode(inode); |
513 | return inode; | |
1da177e4 LT |
514 | } |
515 | ||
516 | /* | |
517 | * The minix V2 function to read an inode. | |
518 | */ | |
a90a0880 | 519 | static struct inode *V2_minix_iget(struct inode *inode) |
1da177e4 LT |
520 | { |
521 | struct buffer_head * bh; | |
522 | struct minix2_inode * raw_inode; | |
523 | struct minix_inode_info *minix_inode = minix_i(inode); | |
524 | int i; | |
525 | ||
526 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
527 | if (!raw_inode) { | |
a90a0880 DH |
528 | iget_failed(inode); |
529 | return ERR_PTR(-EIO); | |
1da177e4 | 530 | } |
facb03dd EB |
531 | if (raw_inode->i_nlinks == 0) { |
532 | printk("MINIX-fs: deleted inode referenced: %lu\n", | |
533 | inode->i_ino); | |
534 | brelse(bh); | |
535 | iget_failed(inode); | |
536 | return ERR_PTR(-ESTALE); | |
537 | } | |
1da177e4 | 538 | inode->i_mode = raw_inode->i_mode; |
f303bdc5 EB |
539 | i_uid_write(inode, raw_inode->i_uid); |
540 | i_gid_write(inode, raw_inode->i_gid); | |
bfe86848 | 541 | set_nlink(inode, raw_inode->i_nlinks); |
1da177e4 LT |
542 | inode->i_size = raw_inode->i_size; |
543 | inode->i_mtime.tv_sec = raw_inode->i_mtime; | |
544 | inode->i_atime.tv_sec = raw_inode->i_atime; | |
545 | inode->i_ctime.tv_sec = raw_inode->i_ctime; | |
546 | inode->i_mtime.tv_nsec = 0; | |
547 | inode->i_atime.tv_nsec = 0; | |
548 | inode->i_ctime.tv_nsec = 0; | |
ba52de12 | 549 | inode->i_blocks = 0; |
1da177e4 LT |
550 | for (i = 0; i < 10; i++) |
551 | minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; | |
552 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
553 | brelse(bh); | |
a90a0880 DH |
554 | unlock_new_inode(inode); |
555 | return inode; | |
1da177e4 LT |
556 | } |
557 | ||
558 | /* | |
559 | * The global function to read an inode. | |
560 | */ | |
a90a0880 | 561 | struct inode *minix_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 562 | { |
a90a0880 DH |
563 | struct inode *inode; |
564 | ||
565 | inode = iget_locked(sb, ino); | |
566 | if (!inode) | |
567 | return ERR_PTR(-ENOMEM); | |
568 | if (!(inode->i_state & I_NEW)) | |
569 | return inode; | |
570 | ||
1da177e4 | 571 | if (INODE_VERSION(inode) == MINIX_V1) |
a90a0880 | 572 | return V1_minix_iget(inode); |
1da177e4 | 573 | else |
a90a0880 | 574 | return V2_minix_iget(inode); |
1da177e4 LT |
575 | } |
576 | ||
577 | /* | |
578 | * The minix V1 function to synchronize an inode. | |
579 | */ | |
580 | static struct buffer_head * V1_minix_update_inode(struct inode * inode) | |
581 | { | |
582 | struct buffer_head * bh; | |
583 | struct minix_inode * raw_inode; | |
584 | struct minix_inode_info *minix_inode = minix_i(inode); | |
585 | int i; | |
586 | ||
587 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
588 | if (!raw_inode) | |
589 | return NULL; | |
590 | raw_inode->i_mode = inode->i_mode; | |
f303bdc5 EB |
591 | raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); |
592 | raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); | |
1da177e4 LT |
593 | raw_inode->i_nlinks = inode->i_nlink; |
594 | raw_inode->i_size = inode->i_size; | |
595 | raw_inode->i_time = inode->i_mtime.tv_sec; | |
596 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
597 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
598 | else for (i = 0; i < 9; i++) | |
599 | raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; | |
600 | mark_buffer_dirty(bh); | |
601 | return bh; | |
602 | } | |
603 | ||
604 | /* | |
605 | * The minix V2 function to synchronize an inode. | |
606 | */ | |
607 | static struct buffer_head * V2_minix_update_inode(struct inode * inode) | |
608 | { | |
609 | struct buffer_head * bh; | |
610 | struct minix2_inode * raw_inode; | |
611 | struct minix_inode_info *minix_inode = minix_i(inode); | |
612 | int i; | |
613 | ||
614 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
615 | if (!raw_inode) | |
616 | return NULL; | |
617 | raw_inode->i_mode = inode->i_mode; | |
f303bdc5 EB |
618 | raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); |
619 | raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); | |
1da177e4 LT |
620 | raw_inode->i_nlinks = inode->i_nlink; |
621 | raw_inode->i_size = inode->i_size; | |
622 | raw_inode->i_mtime = inode->i_mtime.tv_sec; | |
623 | raw_inode->i_atime = inode->i_atime.tv_sec; | |
624 | raw_inode->i_ctime = inode->i_ctime.tv_sec; | |
625 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
626 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
627 | else for (i = 0; i < 10; i++) | |
628 | raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; | |
629 | mark_buffer_dirty(bh); | |
630 | return bh; | |
631 | } | |
632 | ||
a9185b41 | 633 | static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 LT |
634 | { |
635 | int err = 0; | |
636 | struct buffer_head *bh; | |
637 | ||
0d7916d7 AV |
638 | if (INODE_VERSION(inode) == MINIX_V1) |
639 | bh = V1_minix_update_inode(inode); | |
640 | else | |
641 | bh = V2_minix_update_inode(inode); | |
642 | if (!bh) | |
643 | return -EIO; | |
a9185b41 | 644 | if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { |
1da177e4 | 645 | sync_dirty_buffer(bh); |
0d7916d7 | 646 | if (buffer_req(bh) && !buffer_uptodate(bh)) { |
11b84487 | 647 | printk("IO error syncing minix inode [%s:%08lx]\n", |
1da177e4 | 648 | inode->i_sb->s_id, inode->i_ino); |
0d7916d7 | 649 | err = -EIO; |
1da177e4 LT |
650 | } |
651 | } | |
1da177e4 LT |
652 | brelse (bh); |
653 | return err; | |
654 | } | |
655 | ||
549c7297 CB |
656 | int minix_getattr(struct user_namespace *mnt_userns, const struct path *path, |
657 | struct kstat *stat, u32 request_mask, unsigned int flags) | |
1da177e4 | 658 | { |
a528d35e DH |
659 | struct super_block *sb = path->dentry->d_sb; |
660 | struct inode *inode = d_inode(path->dentry); | |
661 | ||
0d56a451 | 662 | generic_fillattr(&init_user_ns, inode, stat); |
a528d35e | 663 | if (INODE_VERSION(inode) == MINIX_V1) |
939b00df | 664 | stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); |
1da177e4 | 665 | else |
939b00df AB |
666 | stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); |
667 | stat->blksize = sb->s_blocksize; | |
1da177e4 LT |
668 | return 0; |
669 | } | |
670 | ||
671 | /* | |
672 | * The function that is called for file truncation. | |
673 | */ | |
674 | void minix_truncate(struct inode * inode) | |
675 | { | |
676 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) | |
677 | return; | |
678 | if (INODE_VERSION(inode) == MINIX_V1) | |
679 | V1_minix_truncate(inode); | |
680 | else | |
681 | V2_minix_truncate(inode); | |
682 | } | |
683 | ||
152a0836 AV |
684 | static struct dentry *minix_mount(struct file_system_type *fs_type, |
685 | int flags, const char *dev_name, void *data) | |
1da177e4 | 686 | { |
152a0836 | 687 | return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); |
1da177e4 LT |
688 | } |
689 | ||
690 | static struct file_system_type minix_fs_type = { | |
691 | .owner = THIS_MODULE, | |
692 | .name = "minix", | |
152a0836 | 693 | .mount = minix_mount, |
1da177e4 LT |
694 | .kill_sb = kill_block_super, |
695 | .fs_flags = FS_REQUIRES_DEV, | |
696 | }; | |
7f78e035 | 697 | MODULE_ALIAS_FS("minix"); |
1da177e4 LT |
698 | |
699 | static int __init init_minix_fs(void) | |
700 | { | |
701 | int err = init_inodecache(); | |
702 | if (err) | |
703 | goto out1; | |
704 | err = register_filesystem(&minix_fs_type); | |
705 | if (err) | |
706 | goto out; | |
707 | return 0; | |
708 | out: | |
709 | destroy_inodecache(); | |
710 | out1: | |
711 | return err; | |
712 | } | |
713 | ||
714 | static void __exit exit_minix_fs(void) | |
715 | { | |
716 | unregister_filesystem(&minix_fs_type); | |
717 | destroy_inodecache(); | |
718 | } | |
719 | ||
720 | module_init(init_minix_fs) | |
721 | module_exit(exit_minix_fs) | |
722 | MODULE_LICENSE("GPL"); | |
723 |