Commit | Line | Data |
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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 | ||
153 | static 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; | |
939b00df AB |
158 | struct minix3_super_block *m3s = NULL; |
159 | unsigned long i, block; | |
1da177e4 LT |
160 | struct inode *root_inode; |
161 | struct minix_sb_info *sbi; | |
a90a0880 | 162 | int ret = -EINVAL; |
1da177e4 | 163 | |
f8314dc6 | 164 | sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); |
1da177e4 LT |
165 | if (!sbi) |
166 | return -ENOMEM; | |
167 | s->s_fs_info = sbi; | |
1da177e4 | 168 | |
2ecd05ae AD |
169 | BUILD_BUG_ON(32 != sizeof (struct minix_inode)); |
170 | BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); | |
1da177e4 LT |
171 | |
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; | |
8de52778 | 194 | s->s_max_links = MINIX_LINK_MAX; |
1da177e4 LT |
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; | |
8de52778 | 199 | s->s_max_links = MINIX_LINK_MAX; |
1da177e4 LT |
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; | |
8de52778 | 205 | s->s_max_links = MINIX2_LINK_MAX; |
1da177e4 LT |
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; | |
8de52778 | 211 | s->s_max_links = MINIX2_LINK_MAX; |
939b00df AB |
212 | } 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; | |
939b00df AB |
225 | sbi->s_mount_state = MINIX_VALID_FS; |
226 | sb_set_blocksize(s, m3s->s_blocksize); | |
8de52778 | 227 | s->s_max_links = MINIX2_LINK_MAX; |
1da177e4 LT |
228 | } else |
229 | goto out_no_fs; | |
230 | ||
231 | /* | |
232 | * Allocate the buffer map to keep the superblock small. | |
233 | */ | |
f5fb09fa AB |
234 | if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) |
235 | goto out_illegal_sb; | |
1da177e4 | 236 | i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); |
f8314dc6 | 237 | map = kzalloc(i, GFP_KERNEL); |
1da177e4 LT |
238 | if (!map) |
239 | goto out_no_map; | |
1da177e4 LT |
240 | 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 | ||
016e8d44 JB |
258 | /* Apparently minix can create filesystems that allocate more blocks for |
259 | * the bitmaps than needed. We simply ignore that, but verify it didn't | |
260 | * create one with not enough blocks and bail out if so. | |
261 | */ | |
262 | block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); | |
263 | if (sbi->s_imap_blocks < block) { | |
264 | printk("MINIX-fs: file system does not have enough " | |
6d6747f8 | 265 | "imap blocks allocated. Refusing to mount.\n"); |
ca85c078 | 266 | goto out_no_bitmap; |
016e8d44 JB |
267 | } |
268 | ||
269 | block = minix_blocks_needed( | |
6d6747f8 | 270 | (sbi->s_nzones - sbi->s_firstdatazone + 1), |
016e8d44 JB |
271 | s->s_blocksize); |
272 | if (sbi->s_zmap_blocks < block) { | |
273 | printk("MINIX-fs: file system does not have enough " | |
274 | "zmap blocks allocated. Refusing to mount.\n"); | |
ca85c078 AV |
275 | goto out_no_bitmap; |
276 | } | |
277 | ||
278 | /* set up enough so that it can read an inode */ | |
279 | s->s_op = &minix_sops; | |
22b13969 DD |
280 | s->s_time_min = 0; |
281 | s->s_time_max = U32_MAX; | |
ca85c078 AV |
282 | root_inode = minix_iget(s, MINIX_ROOT_INO); |
283 | if (IS_ERR(root_inode)) { | |
284 | ret = PTR_ERR(root_inode); | |
285 | goto out_no_root; | |
016e8d44 JB |
286 | } |
287 | ||
d6042eac | 288 | ret = -ENOMEM; |
ca85c078 | 289 | s->s_root = d_make_root(root_inode); |
d6042eac | 290 | if (!s->s_root) |
ca85c078 | 291 | goto out_no_root; |
d6042eac | 292 | |
bc98a42c | 293 | if (!sb_rdonly(s)) { |
d6042eac AV |
294 | if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ |
295 | ms->s_state &= ~MINIX_VALID_FS; | |
296 | mark_buffer_dirty(bh); | |
297 | } | |
298 | if (!(sbi->s_mount_state & MINIX_VALID_FS)) | |
299 | printk("MINIX-fs: mounting unchecked file system, " | |
300 | "running fsck is recommended\n"); | |
301 | else if (sbi->s_mount_state & MINIX_ERROR_FS) | |
302 | printk("MINIX-fs: mounting file system with errors, " | |
303 | "running fsck is recommended\n"); | |
304 | ||
1da177e4 LT |
305 | return 0; |
306 | ||
1da177e4 LT |
307 | out_no_root: |
308 | if (!silent) | |
309 | printk("MINIX-fs: get root inode failed\n"); | |
310 | goto out_freemap; | |
311 | ||
312 | out_no_bitmap: | |
313 | printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); | |
f5fb09fa | 314 | out_freemap: |
1da177e4 LT |
315 | for (i = 0; i < sbi->s_imap_blocks; i++) |
316 | brelse(sbi->s_imap[i]); | |
317 | for (i = 0; i < sbi->s_zmap_blocks; i++) | |
318 | brelse(sbi->s_zmap[i]); | |
319 | kfree(sbi->s_imap); | |
320 | goto out_release; | |
321 | ||
322 | out_no_map: | |
a90a0880 | 323 | ret = -ENOMEM; |
1da177e4 | 324 | if (!silent) |
11b84487 | 325 | printk("MINIX-fs: can't allocate map\n"); |
1da177e4 LT |
326 | goto out_release; |
327 | ||
f5fb09fa AB |
328 | out_illegal_sb: |
329 | if (!silent) | |
330 | printk("MINIX-fs: bad superblock\n"); | |
331 | goto out_release; | |
332 | ||
1da177e4 LT |
333 | out_no_fs: |
334 | if (!silent) | |
939b00df AB |
335 | printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " |
336 | "on device %s.\n", s->s_id); | |
f5fb09fa | 337 | out_release: |
1da177e4 LT |
338 | brelse(bh); |
339 | goto out; | |
340 | ||
341 | out_bad_hblock: | |
11b84487 | 342 | printk("MINIX-fs: blocksize too small for device\n"); |
1da177e4 LT |
343 | goto out; |
344 | ||
345 | out_bad_sb: | |
346 | printk("MINIX-fs: unable to read superblock\n"); | |
f5fb09fa | 347 | out: |
1da177e4 LT |
348 | s->s_fs_info = NULL; |
349 | kfree(sbi); | |
a90a0880 | 350 | return ret; |
1da177e4 LT |
351 | } |
352 | ||
726c3342 | 353 | static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 354 | { |
054475d2 CL |
355 | struct super_block *sb = dentry->d_sb; |
356 | struct minix_sb_info *sbi = minix_sb(sb); | |
357 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
358 | buf->f_type = sb->s_magic; | |
359 | buf->f_bsize = sb->s_blocksize; | |
1da177e4 | 360 | buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; |
016e8d44 | 361 | buf->f_bfree = minix_count_free_blocks(sb); |
1da177e4 LT |
362 | buf->f_bavail = buf->f_bfree; |
363 | buf->f_files = sbi->s_ninodes; | |
016e8d44 | 364 | buf->f_ffree = minix_count_free_inodes(sb); |
1da177e4 | 365 | buf->f_namelen = sbi->s_namelen; |
054475d2 CL |
366 | buf->f_fsid.val[0] = (u32)id; |
367 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
368 | ||
1da177e4 LT |
369 | return 0; |
370 | } | |
371 | ||
372 | static int minix_get_block(struct inode *inode, sector_t block, | |
373 | struct buffer_head *bh_result, int create) | |
374 | { | |
375 | if (INODE_VERSION(inode) == MINIX_V1) | |
376 | return V1_minix_get_block(inode, block, bh_result, create); | |
377 | else | |
378 | return V2_minix_get_block(inode, block, bh_result, create); | |
379 | } | |
380 | ||
381 | static int minix_writepage(struct page *page, struct writeback_control *wbc) | |
382 | { | |
383 | return block_write_full_page(page, minix_get_block, wbc); | |
384 | } | |
4a66af9e | 385 | |
1da177e4 LT |
386 | static int minix_readpage(struct file *file, struct page *page) |
387 | { | |
388 | return block_read_full_page(page,minix_get_block); | |
389 | } | |
4a66af9e | 390 | |
f4e420dc | 391 | int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) |
1da177e4 | 392 | { |
6e1db88d | 393 | return __block_write_begin(page, pos, len, minix_get_block); |
1da177e4 | 394 | } |
4a66af9e | 395 | |
7fc7cd00 MS |
396 | static void minix_write_failed(struct address_space *mapping, loff_t to) |
397 | { | |
398 | struct inode *inode = mapping->host; | |
399 | ||
400 | if (to > inode->i_size) { | |
7caef267 | 401 | truncate_pagecache(inode, inode->i_size); |
7fc7cd00 MS |
402 | minix_truncate(inode); |
403 | } | |
404 | } | |
405 | ||
4a66af9e NP |
406 | static int minix_write_begin(struct file *file, struct address_space *mapping, |
407 | loff_t pos, unsigned len, unsigned flags, | |
408 | struct page **pagep, void **fsdata) | |
409 | { | |
155130a4 CH |
410 | int ret; |
411 | ||
412 | ret = block_write_begin(mapping, pos, len, flags, pagep, | |
f4e420dc | 413 | minix_get_block); |
7fc7cd00 MS |
414 | if (unlikely(ret)) |
415 | minix_write_failed(mapping, pos + len); | |
155130a4 CH |
416 | |
417 | return ret; | |
4a66af9e NP |
418 | } |
419 | ||
1da177e4 LT |
420 | static sector_t minix_bmap(struct address_space *mapping, sector_t block) |
421 | { | |
422 | return generic_block_bmap(mapping,block,minix_get_block); | |
423 | } | |
4a66af9e | 424 | |
f5e54d6e | 425 | static const struct address_space_operations minix_aops = { |
1da177e4 LT |
426 | .readpage = minix_readpage, |
427 | .writepage = minix_writepage, | |
4a66af9e NP |
428 | .write_begin = minix_write_begin, |
429 | .write_end = generic_write_end, | |
1da177e4 LT |
430 | .bmap = minix_bmap |
431 | }; | |
432 | ||
92e1d5be | 433 | static const struct inode_operations minix_symlink_inode_operations = { |
6b255391 | 434 | .get_link = page_get_link, |
1da177e4 LT |
435 | .getattr = minix_getattr, |
436 | }; | |
437 | ||
438 | void minix_set_inode(struct inode *inode, dev_t rdev) | |
439 | { | |
440 | if (S_ISREG(inode->i_mode)) { | |
441 | inode->i_op = &minix_file_inode_operations; | |
442 | inode->i_fop = &minix_file_operations; | |
443 | inode->i_mapping->a_ops = &minix_aops; | |
444 | } else if (S_ISDIR(inode->i_mode)) { | |
445 | inode->i_op = &minix_dir_inode_operations; | |
446 | inode->i_fop = &minix_dir_operations; | |
447 | inode->i_mapping->a_ops = &minix_aops; | |
448 | } else if (S_ISLNK(inode->i_mode)) { | |
449 | inode->i_op = &minix_symlink_inode_operations; | |
21fc61c7 | 450 | inode_nohighmem(inode); |
1da177e4 LT |
451 | inode->i_mapping->a_ops = &minix_aops; |
452 | } else | |
453 | init_special_inode(inode, inode->i_mode, rdev); | |
454 | } | |
455 | ||
456 | /* | |
457 | * The minix V1 function to read an inode. | |
458 | */ | |
a90a0880 | 459 | static struct inode *V1_minix_iget(struct inode *inode) |
1da177e4 LT |
460 | { |
461 | struct buffer_head * bh; | |
462 | struct minix_inode * raw_inode; | |
463 | struct minix_inode_info *minix_inode = minix_i(inode); | |
464 | int i; | |
465 | ||
466 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
467 | if (!raw_inode) { | |
a90a0880 DH |
468 | iget_failed(inode); |
469 | return ERR_PTR(-EIO); | |
1da177e4 LT |
470 | } |
471 | inode->i_mode = raw_inode->i_mode; | |
f303bdc5 EB |
472 | i_uid_write(inode, raw_inode->i_uid); |
473 | i_gid_write(inode, raw_inode->i_gid); | |
bfe86848 | 474 | set_nlink(inode, raw_inode->i_nlinks); |
1da177e4 LT |
475 | inode->i_size = raw_inode->i_size; |
476 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; | |
477 | inode->i_mtime.tv_nsec = 0; | |
478 | inode->i_atime.tv_nsec = 0; | |
479 | inode->i_ctime.tv_nsec = 0; | |
ba52de12 | 480 | inode->i_blocks = 0; |
1da177e4 LT |
481 | for (i = 0; i < 9; i++) |
482 | minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; | |
483 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
484 | brelse(bh); | |
a90a0880 DH |
485 | unlock_new_inode(inode); |
486 | return inode; | |
1da177e4 LT |
487 | } |
488 | ||
489 | /* | |
490 | * The minix V2 function to read an inode. | |
491 | */ | |
a90a0880 | 492 | static struct inode *V2_minix_iget(struct inode *inode) |
1da177e4 LT |
493 | { |
494 | struct buffer_head * bh; | |
495 | struct minix2_inode * raw_inode; | |
496 | struct minix_inode_info *minix_inode = minix_i(inode); | |
497 | int i; | |
498 | ||
499 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
500 | if (!raw_inode) { | |
a90a0880 DH |
501 | iget_failed(inode); |
502 | return ERR_PTR(-EIO); | |
1da177e4 LT |
503 | } |
504 | inode->i_mode = raw_inode->i_mode; | |
f303bdc5 EB |
505 | i_uid_write(inode, raw_inode->i_uid); |
506 | i_gid_write(inode, raw_inode->i_gid); | |
bfe86848 | 507 | set_nlink(inode, raw_inode->i_nlinks); |
1da177e4 LT |
508 | inode->i_size = raw_inode->i_size; |
509 | inode->i_mtime.tv_sec = raw_inode->i_mtime; | |
510 | inode->i_atime.tv_sec = raw_inode->i_atime; | |
511 | inode->i_ctime.tv_sec = raw_inode->i_ctime; | |
512 | inode->i_mtime.tv_nsec = 0; | |
513 | inode->i_atime.tv_nsec = 0; | |
514 | inode->i_ctime.tv_nsec = 0; | |
ba52de12 | 515 | inode->i_blocks = 0; |
1da177e4 LT |
516 | for (i = 0; i < 10; i++) |
517 | minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; | |
518 | minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); | |
519 | brelse(bh); | |
a90a0880 DH |
520 | unlock_new_inode(inode); |
521 | return inode; | |
1da177e4 LT |
522 | } |
523 | ||
524 | /* | |
525 | * The global function to read an inode. | |
526 | */ | |
a90a0880 | 527 | struct inode *minix_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 528 | { |
a90a0880 DH |
529 | struct inode *inode; |
530 | ||
531 | inode = iget_locked(sb, ino); | |
532 | if (!inode) | |
533 | return ERR_PTR(-ENOMEM); | |
534 | if (!(inode->i_state & I_NEW)) | |
535 | return inode; | |
536 | ||
1da177e4 | 537 | if (INODE_VERSION(inode) == MINIX_V1) |
a90a0880 | 538 | return V1_minix_iget(inode); |
1da177e4 | 539 | else |
a90a0880 | 540 | return V2_minix_iget(inode); |
1da177e4 LT |
541 | } |
542 | ||
543 | /* | |
544 | * The minix V1 function to synchronize an inode. | |
545 | */ | |
546 | static struct buffer_head * V1_minix_update_inode(struct inode * inode) | |
547 | { | |
548 | struct buffer_head * bh; | |
549 | struct minix_inode * raw_inode; | |
550 | struct minix_inode_info *minix_inode = minix_i(inode); | |
551 | int i; | |
552 | ||
553 | raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
554 | if (!raw_inode) | |
555 | return NULL; | |
556 | raw_inode->i_mode = inode->i_mode; | |
f303bdc5 EB |
557 | raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); |
558 | raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); | |
1da177e4 LT |
559 | raw_inode->i_nlinks = inode->i_nlink; |
560 | raw_inode->i_size = inode->i_size; | |
561 | raw_inode->i_time = inode->i_mtime.tv_sec; | |
562 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
563 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
564 | else for (i = 0; i < 9; i++) | |
565 | raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; | |
566 | mark_buffer_dirty(bh); | |
567 | return bh; | |
568 | } | |
569 | ||
570 | /* | |
571 | * The minix V2 function to synchronize an inode. | |
572 | */ | |
573 | static struct buffer_head * V2_minix_update_inode(struct inode * inode) | |
574 | { | |
575 | struct buffer_head * bh; | |
576 | struct minix2_inode * raw_inode; | |
577 | struct minix_inode_info *minix_inode = minix_i(inode); | |
578 | int i; | |
579 | ||
580 | raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); | |
581 | if (!raw_inode) | |
582 | return NULL; | |
583 | raw_inode->i_mode = inode->i_mode; | |
f303bdc5 EB |
584 | raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); |
585 | raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); | |
1da177e4 LT |
586 | raw_inode->i_nlinks = inode->i_nlink; |
587 | raw_inode->i_size = inode->i_size; | |
588 | raw_inode->i_mtime = inode->i_mtime.tv_sec; | |
589 | raw_inode->i_atime = inode->i_atime.tv_sec; | |
590 | raw_inode->i_ctime = inode->i_ctime.tv_sec; | |
591 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
592 | raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); | |
593 | else for (i = 0; i < 10; i++) | |
594 | raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; | |
595 | mark_buffer_dirty(bh); | |
596 | return bh; | |
597 | } | |
598 | ||
a9185b41 | 599 | static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 LT |
600 | { |
601 | int err = 0; | |
602 | struct buffer_head *bh; | |
603 | ||
0d7916d7 AV |
604 | if (INODE_VERSION(inode) == MINIX_V1) |
605 | bh = V1_minix_update_inode(inode); | |
606 | else | |
607 | bh = V2_minix_update_inode(inode); | |
608 | if (!bh) | |
609 | return -EIO; | |
a9185b41 | 610 | if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { |
1da177e4 | 611 | sync_dirty_buffer(bh); |
0d7916d7 | 612 | if (buffer_req(bh) && !buffer_uptodate(bh)) { |
11b84487 | 613 | printk("IO error syncing minix inode [%s:%08lx]\n", |
1da177e4 | 614 | inode->i_sb->s_id, inode->i_ino); |
0d7916d7 | 615 | err = -EIO; |
1da177e4 LT |
616 | } |
617 | } | |
1da177e4 LT |
618 | brelse (bh); |
619 | return err; | |
620 | } | |
621 | ||
a528d35e DH |
622 | int minix_getattr(const struct path *path, struct kstat *stat, |
623 | u32 request_mask, unsigned int flags) | |
1da177e4 | 624 | { |
a528d35e DH |
625 | struct super_block *sb = path->dentry->d_sb; |
626 | struct inode *inode = d_inode(path->dentry); | |
627 | ||
628 | generic_fillattr(inode, stat); | |
629 | if (INODE_VERSION(inode) == MINIX_V1) | |
939b00df | 630 | stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); |
1da177e4 | 631 | else |
939b00df AB |
632 | stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); |
633 | stat->blksize = sb->s_blocksize; | |
1da177e4 LT |
634 | return 0; |
635 | } | |
636 | ||
637 | /* | |
638 | * The function that is called for file truncation. | |
639 | */ | |
640 | void minix_truncate(struct inode * inode) | |
641 | { | |
642 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) | |
643 | return; | |
644 | if (INODE_VERSION(inode) == MINIX_V1) | |
645 | V1_minix_truncate(inode); | |
646 | else | |
647 | V2_minix_truncate(inode); | |
648 | } | |
649 | ||
152a0836 AV |
650 | static struct dentry *minix_mount(struct file_system_type *fs_type, |
651 | int flags, const char *dev_name, void *data) | |
1da177e4 | 652 | { |
152a0836 | 653 | return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); |
1da177e4 LT |
654 | } |
655 | ||
656 | static struct file_system_type minix_fs_type = { | |
657 | .owner = THIS_MODULE, | |
658 | .name = "minix", | |
152a0836 | 659 | .mount = minix_mount, |
1da177e4 LT |
660 | .kill_sb = kill_block_super, |
661 | .fs_flags = FS_REQUIRES_DEV, | |
662 | }; | |
7f78e035 | 663 | MODULE_ALIAS_FS("minix"); |
1da177e4 LT |
664 | |
665 | static int __init init_minix_fs(void) | |
666 | { | |
667 | int err = init_inodecache(); | |
668 | if (err) | |
669 | goto out1; | |
670 | err = register_filesystem(&minix_fs_type); | |
671 | if (err) | |
672 | goto out; | |
673 | return 0; | |
674 | out: | |
675 | destroy_inodecache(); | |
676 | out1: | |
677 | return err; | |
678 | } | |
679 | ||
680 | static void __exit exit_minix_fs(void) | |
681 | { | |
682 | unregister_filesystem(&minix_fs_type); | |
683 | destroy_inodecache(); | |
684 | } | |
685 | ||
686 | module_init(init_minix_fs) | |
687 | module_exit(exit_minix_fs) | |
688 | MODULE_LICENSE("GPL"); | |
689 |