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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/sysv/inode.c | |
3 | * | |
4 | * minix/inode.c | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * | |
7 | * xenix/inode.c | |
8 | * Copyright (C) 1992 Doug Evans | |
9 | * | |
10 | * coh/inode.c | |
11 | * Copyright (C) 1993 Pascal Haible, Bruno Haible | |
12 | * | |
13 | * sysv/inode.c | |
14 | * Copyright (C) 1993 Paul B. Monday | |
15 | * | |
16 | * sysv/inode.c | |
17 | * Copyright (C) 1993 Bruno Haible | |
18 | * Copyright (C) 1997, 1998 Krzysztof G. Baranowski | |
19 | * | |
20 | * This file contains code for allocating/freeing inodes and for read/writing | |
21 | * the superblock. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/highuid.h> |
25 | #include <linux/slab.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/buffer_head.h> | |
28 | #include <linux/vfs.h> | |
a9185b41 | 29 | #include <linux/writeback.h> |
21acaf8e | 30 | #include <linux/namei.h> |
1da177e4 LT |
31 | #include <asm/byteorder.h> |
32 | #include "sysv.h" | |
33 | ||
ad43ffde | 34 | static int sysv_sync_fs(struct super_block *sb, int wait) |
1da177e4 LT |
35 | { |
36 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
37 | unsigned long time = get_seconds(), old_time; | |
38 | ||
ebc1ac16 | 39 | lock_super(sb); |
1da177e4 LT |
40 | |
41 | /* | |
42 | * If we are going to write out the super block, | |
43 | * then attach current time stamp. | |
44 | * But if the filesystem was marked clean, keep it clean. | |
45 | */ | |
4c9002de | 46 | sb->s_dirt = 0; |
1da177e4 LT |
47 | old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); |
48 | if (sbi->s_type == FSTYPE_SYSV4) { | |
49 | if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time)) | |
50 | *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time); | |
51 | *sbi->s_sb_time = cpu_to_fs32(sbi, time); | |
52 | mark_buffer_dirty(sbi->s_bh2); | |
53 | } | |
ad43ffde | 54 | |
ebc1ac16 | 55 | unlock_super(sb); |
ad43ffde CH |
56 | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static void sysv_write_super(struct super_block *sb) | |
61 | { | |
62 | if (!(sb->s_flags & MS_RDONLY)) | |
63 | sysv_sync_fs(sb, 1); | |
64 | else | |
65 | sb->s_dirt = 0; | |
1da177e4 LT |
66 | } |
67 | ||
68 | static int sysv_remount(struct super_block *sb, int *flags, char *data) | |
69 | { | |
70 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
bbd6851a | 71 | lock_super(sb); |
1da177e4 LT |
72 | if (sbi->s_forced_ro) |
73 | *flags |= MS_RDONLY; | |
719f2c87 AB |
74 | if (*flags & MS_RDONLY) |
75 | sysv_write_super(sb); | |
bbd6851a | 76 | unlock_super(sb); |
1da177e4 LT |
77 | return 0; |
78 | } | |
79 | ||
80 | static void sysv_put_super(struct super_block *sb) | |
81 | { | |
82 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
83 | ||
8c85e125 CH |
84 | if (sb->s_dirt) |
85 | sysv_write_super(sb); | |
86 | ||
1da177e4 LT |
87 | if (!(sb->s_flags & MS_RDONLY)) { |
88 | /* XXX ext2 also updates the state here */ | |
89 | mark_buffer_dirty(sbi->s_bh1); | |
90 | if (sbi->s_bh1 != sbi->s_bh2) | |
91 | mark_buffer_dirty(sbi->s_bh2); | |
92 | } | |
93 | ||
94 | brelse(sbi->s_bh1); | |
95 | if (sbi->s_bh1 != sbi->s_bh2) | |
96 | brelse(sbi->s_bh2); | |
97 | ||
98 | kfree(sbi); | |
99 | } | |
100 | ||
726c3342 | 101 | static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 102 | { |
726c3342 | 103 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 104 | struct sysv_sb_info *sbi = SYSV_SB(sb); |
1c5b4541 | 105 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
106 | |
107 | buf->f_type = sb->s_magic; | |
108 | buf->f_bsize = sb->s_blocksize; | |
109 | buf->f_blocks = sbi->s_ndatazones; | |
110 | buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb); | |
111 | buf->f_files = sbi->s_ninodes; | |
112 | buf->f_ffree = sysv_count_free_inodes(sb); | |
113 | buf->f_namelen = SYSV_NAMELEN; | |
1c5b4541 CL |
114 | buf->f_fsid.val[0] = (u32)id; |
115 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
116 | return 0; |
117 | } | |
118 | ||
119 | /* | |
120 | * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 | |
121 | */ | |
122 | static inline void read3byte(struct sysv_sb_info *sbi, | |
123 | unsigned char * from, unsigned char * to) | |
124 | { | |
125 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
126 | to[0] = from[0]; | |
127 | to[1] = 0; | |
128 | to[2] = from[1]; | |
129 | to[3] = from[2]; | |
130 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
131 | to[0] = from[0]; | |
132 | to[1] = from[1]; | |
133 | to[2] = from[2]; | |
134 | to[3] = 0; | |
135 | } else { | |
136 | to[0] = 0; | |
137 | to[1] = from[0]; | |
138 | to[2] = from[1]; | |
139 | to[3] = from[2]; | |
140 | } | |
141 | } | |
142 | ||
143 | static inline void write3byte(struct sysv_sb_info *sbi, | |
144 | unsigned char * from, unsigned char * to) | |
145 | { | |
146 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
147 | to[0] = from[0]; | |
148 | to[1] = from[2]; | |
149 | to[2] = from[3]; | |
150 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
151 | to[0] = from[0]; | |
152 | to[1] = from[1]; | |
153 | to[2] = from[2]; | |
154 | } else { | |
155 | to[0] = from[1]; | |
156 | to[1] = from[2]; | |
157 | to[2] = from[3]; | |
158 | } | |
159 | } | |
160 | ||
c5ef1c42 | 161 | static const struct inode_operations sysv_symlink_inode_operations = { |
1da177e4 LT |
162 | .readlink = generic_readlink, |
163 | .follow_link = page_follow_link_light, | |
164 | .put_link = page_put_link, | |
165 | .getattr = sysv_getattr, | |
166 | }; | |
167 | ||
168 | void sysv_set_inode(struct inode *inode, dev_t rdev) | |
169 | { | |
170 | if (S_ISREG(inode->i_mode)) { | |
171 | inode->i_op = &sysv_file_inode_operations; | |
172 | inode->i_fop = &sysv_file_operations; | |
173 | inode->i_mapping->a_ops = &sysv_aops; | |
174 | } else if (S_ISDIR(inode->i_mode)) { | |
175 | inode->i_op = &sysv_dir_inode_operations; | |
176 | inode->i_fop = &sysv_dir_operations; | |
177 | inode->i_mapping->a_ops = &sysv_aops; | |
178 | } else if (S_ISLNK(inode->i_mode)) { | |
179 | if (inode->i_blocks) { | |
180 | inode->i_op = &sysv_symlink_inode_operations; | |
181 | inode->i_mapping->a_ops = &sysv_aops; | |
21acaf8e | 182 | } else { |
1da177e4 | 183 | inode->i_op = &sysv_fast_symlink_inode_operations; |
21acaf8e DG |
184 | nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size, |
185 | sizeof(SYSV_I(inode)->i_data) - 1); | |
186 | } | |
1da177e4 LT |
187 | } else |
188 | init_special_inode(inode, inode->i_mode, rdev); | |
189 | } | |
190 | ||
b8e1343f | 191 | struct inode *sysv_iget(struct super_block *sb, unsigned int ino) |
1da177e4 | 192 | { |
1da177e4 LT |
193 | struct sysv_sb_info * sbi = SYSV_SB(sb); |
194 | struct buffer_head * bh; | |
195 | struct sysv_inode * raw_inode; | |
196 | struct sysv_inode_info * si; | |
b8e1343f DH |
197 | struct inode *inode; |
198 | unsigned int block; | |
1da177e4 LT |
199 | |
200 | if (!ino || ino > sbi->s_ninodes) { | |
201 | printk("Bad inode number on dev %s: %d is out of range\n", | |
b8e1343f DH |
202 | sb->s_id, ino); |
203 | return ERR_PTR(-EIO); | |
1da177e4 | 204 | } |
b8e1343f DH |
205 | |
206 | inode = iget_locked(sb, ino); | |
207 | if (!inode) | |
208 | return ERR_PTR(-ENOMEM); | |
209 | if (!(inode->i_state & I_NEW)) | |
210 | return inode; | |
211 | ||
1da177e4 LT |
212 | raw_inode = sysv_raw_inode(sb, ino, &bh); |
213 | if (!raw_inode) { | |
214 | printk("Major problem: unable to read inode from dev %s\n", | |
215 | inode->i_sb->s_id); | |
216 | goto bad_inode; | |
217 | } | |
218 | /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ | |
219 | inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); | |
220 | inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid); | |
221 | inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid); | |
bfe86848 | 222 | set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink)); |
1da177e4 LT |
223 | inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); |
224 | inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); | |
225 | inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); | |
226 | inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); | |
227 | inode->i_ctime.tv_nsec = 0; | |
228 | inode->i_atime.tv_nsec = 0; | |
229 | inode->i_mtime.tv_nsec = 0; | |
ba52de12 | 230 | inode->i_blocks = 0; |
1da177e4 LT |
231 | |
232 | si = SYSV_I(inode); | |
233 | for (block = 0; block < 10+1+1+1; block++) | |
234 | read3byte(sbi, &raw_inode->i_data[3*block], | |
235 | (u8 *)&si->i_data[block]); | |
236 | brelse(bh); | |
237 | si->i_dir_start_lookup = 0; | |
238 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
239 | sysv_set_inode(inode, | |
240 | old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); | |
241 | else | |
242 | sysv_set_inode(inode, 0); | |
b8e1343f DH |
243 | unlock_new_inode(inode); |
244 | return inode; | |
1da177e4 LT |
245 | |
246 | bad_inode: | |
b8e1343f DH |
247 | iget_failed(inode); |
248 | return ERR_PTR(-EIO); | |
1da177e4 LT |
249 | } |
250 | ||
a9185b41 | 251 | static int __sysv_write_inode(struct inode *inode, int wait) |
1da177e4 LT |
252 | { |
253 | struct super_block * sb = inode->i_sb; | |
254 | struct sysv_sb_info * sbi = SYSV_SB(sb); | |
255 | struct buffer_head * bh; | |
256 | struct sysv_inode * raw_inode; | |
257 | struct sysv_inode_info * si; | |
258 | unsigned int ino, block; | |
05459ca8 | 259 | int err = 0; |
1da177e4 LT |
260 | |
261 | ino = inode->i_ino; | |
262 | if (!ino || ino > sbi->s_ninodes) { | |
263 | printk("Bad inode number on dev %s: %d is out of range\n", | |
264 | inode->i_sb->s_id, ino); | |
05459ca8 | 265 | return -EIO; |
1da177e4 LT |
266 | } |
267 | raw_inode = sysv_raw_inode(sb, ino, &bh); | |
268 | if (!raw_inode) { | |
269 | printk("unable to read i-node block\n"); | |
05459ca8 | 270 | return -EIO; |
1da177e4 LT |
271 | } |
272 | ||
273 | raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); | |
274 | raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid)); | |
275 | raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid)); | |
276 | raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); | |
277 | raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); | |
278 | raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); | |
279 | raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); | |
280 | raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); | |
281 | ||
282 | si = SYSV_I(inode); | |
283 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
284 | si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); | |
285 | for (block = 0; block < 10+1+1+1; block++) | |
286 | write3byte(sbi, (u8 *)&si->i_data[block], | |
287 | &raw_inode->i_data[3*block]); | |
288 | mark_buffer_dirty(bh); | |
05459ca8 AV |
289 | if (wait) { |
290 | sync_dirty_buffer(bh); | |
291 | if (buffer_req(bh) && !buffer_uptodate(bh)) { | |
292 | printk ("IO error syncing sysv inode [%s:%08x]\n", | |
293 | sb->s_id, ino); | |
294 | err = -EIO; | |
295 | } | |
296 | } | |
1da177e4 | 297 | brelse(bh); |
1da177e4 LT |
298 | return 0; |
299 | } | |
300 | ||
a9185b41 CH |
301 | int sysv_write_inode(struct inode *inode, struct writeback_control *wbc) |
302 | { | |
303 | return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
304 | } | |
305 | ||
05459ca8 | 306 | int sysv_sync_inode(struct inode *inode) |
1da177e4 | 307 | { |
a9185b41 | 308 | return __sysv_write_inode(inode, 1); |
1da177e4 LT |
309 | } |
310 | ||
d299eadc | 311 | static void sysv_evict_inode(struct inode *inode) |
1da177e4 | 312 | { |
fef26658 | 313 | truncate_inode_pages(&inode->i_data, 0); |
d299eadc AV |
314 | if (!inode->i_nlink) { |
315 | inode->i_size = 0; | |
316 | sysv_truncate(inode); | |
317 | } | |
318 | invalidate_inode_buffers(inode); | |
319 | end_writeback(inode); | |
320 | if (!inode->i_nlink) | |
321 | sysv_free_inode(inode); | |
1da177e4 LT |
322 | } |
323 | ||
e18b890b | 324 | static struct kmem_cache *sysv_inode_cachep; |
1da177e4 LT |
325 | |
326 | static struct inode *sysv_alloc_inode(struct super_block *sb) | |
327 | { | |
328 | struct sysv_inode_info *si; | |
329 | ||
e94b1766 | 330 | si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
331 | if (!si) |
332 | return NULL; | |
333 | return &si->vfs_inode; | |
334 | } | |
335 | ||
fa0d7e3d | 336 | static void sysv_i_callback(struct rcu_head *head) |
1da177e4 | 337 | { |
fa0d7e3d NP |
338 | struct inode *inode = container_of(head, struct inode, i_rcu); |
339 | INIT_LIST_HEAD(&inode->i_dentry); | |
1da177e4 LT |
340 | kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); |
341 | } | |
342 | ||
fa0d7e3d NP |
343 | static void sysv_destroy_inode(struct inode *inode) |
344 | { | |
345 | call_rcu(&inode->i_rcu, sysv_i_callback); | |
346 | } | |
347 | ||
51cc5068 | 348 | static void init_once(void *p) |
1da177e4 LT |
349 | { |
350 | struct sysv_inode_info *si = (struct sysv_inode_info *)p; | |
351 | ||
a35afb83 | 352 | inode_init_once(&si->vfs_inode); |
1da177e4 LT |
353 | } |
354 | ||
ee9b6d61 | 355 | const struct super_operations sysv_sops = { |
1da177e4 LT |
356 | .alloc_inode = sysv_alloc_inode, |
357 | .destroy_inode = sysv_destroy_inode, | |
1da177e4 | 358 | .write_inode = sysv_write_inode, |
d299eadc | 359 | .evict_inode = sysv_evict_inode, |
1da177e4 LT |
360 | .put_super = sysv_put_super, |
361 | .write_super = sysv_write_super, | |
ad43ffde | 362 | .sync_fs = sysv_sync_fs, |
1da177e4 LT |
363 | .remount_fs = sysv_remount, |
364 | .statfs = sysv_statfs, | |
365 | }; | |
366 | ||
367 | int __init sysv_init_icache(void) | |
368 | { | |
369 | sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", | |
370 | sizeof(struct sysv_inode_info), 0, | |
4b6a9316 | 371 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
20c2df83 | 372 | init_once); |
1da177e4 LT |
373 | if (!sysv_inode_cachep) |
374 | return -ENOMEM; | |
375 | return 0; | |
376 | } | |
377 | ||
378 | void sysv_destroy_icache(void) | |
379 | { | |
380 | kmem_cache_destroy(sysv_inode_cachep); | |
381 | } |