Commit | Line | Data |
---|---|---|
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 | ||
c07cb01c | 39 | mutex_lock(&sbi->s_lock); |
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 | */ | |
46 | old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); | |
47 | if (sbi->s_type == FSTYPE_SYSV4) { | |
48 | if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time)) | |
49 | *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time); | |
50 | *sbi->s_sb_time = cpu_to_fs32(sbi, time); | |
51 | mark_buffer_dirty(sbi->s_bh2); | |
52 | } | |
ad43ffde | 53 | |
c07cb01c | 54 | mutex_unlock(&sbi->s_lock); |
ad43ffde CH |
55 | |
56 | return 0; | |
57 | } | |
58 | ||
1da177e4 LT |
59 | static int sysv_remount(struct super_block *sb, int *flags, char *data) |
60 | { | |
61 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
eee45893 | 62 | |
1da177e4 LT |
63 | if (sbi->s_forced_ro) |
64 | *flags |= MS_RDONLY; | |
1da177e4 LT |
65 | return 0; |
66 | } | |
67 | ||
68 | static void sysv_put_super(struct super_block *sb) | |
69 | { | |
70 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
71 | ||
72 | if (!(sb->s_flags & MS_RDONLY)) { | |
73 | /* XXX ext2 also updates the state here */ | |
74 | mark_buffer_dirty(sbi->s_bh1); | |
75 | if (sbi->s_bh1 != sbi->s_bh2) | |
76 | mark_buffer_dirty(sbi->s_bh2); | |
77 | } | |
78 | ||
79 | brelse(sbi->s_bh1); | |
80 | if (sbi->s_bh1 != sbi->s_bh2) | |
81 | brelse(sbi->s_bh2); | |
82 | ||
83 | kfree(sbi); | |
84 | } | |
85 | ||
726c3342 | 86 | static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 87 | { |
726c3342 | 88 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 89 | struct sysv_sb_info *sbi = SYSV_SB(sb); |
1c5b4541 | 90 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
91 | |
92 | buf->f_type = sb->s_magic; | |
93 | buf->f_bsize = sb->s_blocksize; | |
94 | buf->f_blocks = sbi->s_ndatazones; | |
95 | buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb); | |
96 | buf->f_files = sbi->s_ninodes; | |
97 | buf->f_ffree = sysv_count_free_inodes(sb); | |
98 | buf->f_namelen = SYSV_NAMELEN; | |
1c5b4541 CL |
99 | buf->f_fsid.val[0] = (u32)id; |
100 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
101 | return 0; |
102 | } | |
103 | ||
104 | /* | |
105 | * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 | |
106 | */ | |
107 | static inline void read3byte(struct sysv_sb_info *sbi, | |
108 | unsigned char * from, unsigned char * to) | |
109 | { | |
110 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
111 | to[0] = from[0]; | |
112 | to[1] = 0; | |
113 | to[2] = from[1]; | |
114 | to[3] = from[2]; | |
115 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
116 | to[0] = from[0]; | |
117 | to[1] = from[1]; | |
118 | to[2] = from[2]; | |
119 | to[3] = 0; | |
120 | } else { | |
121 | to[0] = 0; | |
122 | to[1] = from[0]; | |
123 | to[2] = from[1]; | |
124 | to[3] = from[2]; | |
125 | } | |
126 | } | |
127 | ||
128 | static inline void write3byte(struct sysv_sb_info *sbi, | |
129 | unsigned char * from, unsigned char * to) | |
130 | { | |
131 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
132 | to[0] = from[0]; | |
133 | to[1] = from[2]; | |
134 | to[2] = from[3]; | |
135 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
136 | to[0] = from[0]; | |
137 | to[1] = from[1]; | |
138 | to[2] = from[2]; | |
139 | } else { | |
140 | to[0] = from[1]; | |
141 | to[1] = from[2]; | |
142 | to[2] = from[3]; | |
143 | } | |
144 | } | |
145 | ||
c5ef1c42 | 146 | static const struct inode_operations sysv_symlink_inode_operations = { |
1da177e4 LT |
147 | .readlink = generic_readlink, |
148 | .follow_link = page_follow_link_light, | |
149 | .put_link = page_put_link, | |
150 | .getattr = sysv_getattr, | |
151 | }; | |
152 | ||
153 | void sysv_set_inode(struct inode *inode, dev_t rdev) | |
154 | { | |
155 | if (S_ISREG(inode->i_mode)) { | |
156 | inode->i_op = &sysv_file_inode_operations; | |
157 | inode->i_fop = &sysv_file_operations; | |
158 | inode->i_mapping->a_ops = &sysv_aops; | |
159 | } else if (S_ISDIR(inode->i_mode)) { | |
160 | inode->i_op = &sysv_dir_inode_operations; | |
161 | inode->i_fop = &sysv_dir_operations; | |
162 | inode->i_mapping->a_ops = &sysv_aops; | |
163 | } else if (S_ISLNK(inode->i_mode)) { | |
86347504 AV |
164 | inode->i_op = &sysv_symlink_inode_operations; |
165 | inode->i_mapping->a_ops = &sysv_aops; | |
1da177e4 LT |
166 | } else |
167 | init_special_inode(inode, inode->i_mode, rdev); | |
168 | } | |
169 | ||
b8e1343f | 170 | struct inode *sysv_iget(struct super_block *sb, unsigned int ino) |
1da177e4 | 171 | { |
1da177e4 LT |
172 | struct sysv_sb_info * sbi = SYSV_SB(sb); |
173 | struct buffer_head * bh; | |
174 | struct sysv_inode * raw_inode; | |
175 | struct sysv_inode_info * si; | |
b8e1343f DH |
176 | struct inode *inode; |
177 | unsigned int block; | |
1da177e4 LT |
178 | |
179 | if (!ino || ino > sbi->s_ninodes) { | |
180 | printk("Bad inode number on dev %s: %d is out of range\n", | |
b8e1343f DH |
181 | sb->s_id, ino); |
182 | return ERR_PTR(-EIO); | |
1da177e4 | 183 | } |
b8e1343f DH |
184 | |
185 | inode = iget_locked(sb, ino); | |
186 | if (!inode) | |
187 | return ERR_PTR(-ENOMEM); | |
188 | if (!(inode->i_state & I_NEW)) | |
189 | return inode; | |
190 | ||
1da177e4 LT |
191 | raw_inode = sysv_raw_inode(sb, ino, &bh); |
192 | if (!raw_inode) { | |
193 | printk("Major problem: unable to read inode from dev %s\n", | |
194 | inode->i_sb->s_id); | |
195 | goto bad_inode; | |
196 | } | |
197 | /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ | |
198 | inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); | |
a726ecce EB |
199 | i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid)); |
200 | i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid)); | |
bfe86848 | 201 | set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink)); |
1da177e4 LT |
202 | inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); |
203 | inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); | |
204 | inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); | |
205 | inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); | |
206 | inode->i_ctime.tv_nsec = 0; | |
207 | inode->i_atime.tv_nsec = 0; | |
208 | inode->i_mtime.tv_nsec = 0; | |
ba52de12 | 209 | inode->i_blocks = 0; |
1da177e4 LT |
210 | |
211 | si = SYSV_I(inode); | |
212 | for (block = 0; block < 10+1+1+1; block++) | |
213 | read3byte(sbi, &raw_inode->i_data[3*block], | |
214 | (u8 *)&si->i_data[block]); | |
215 | brelse(bh); | |
216 | si->i_dir_start_lookup = 0; | |
217 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
218 | sysv_set_inode(inode, | |
219 | old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); | |
220 | else | |
221 | sysv_set_inode(inode, 0); | |
b8e1343f DH |
222 | unlock_new_inode(inode); |
223 | return inode; | |
1da177e4 LT |
224 | |
225 | bad_inode: | |
b8e1343f DH |
226 | iget_failed(inode); |
227 | return ERR_PTR(-EIO); | |
1da177e4 LT |
228 | } |
229 | ||
a9185b41 | 230 | static int __sysv_write_inode(struct inode *inode, int wait) |
1da177e4 LT |
231 | { |
232 | struct super_block * sb = inode->i_sb; | |
233 | struct sysv_sb_info * sbi = SYSV_SB(sb); | |
234 | struct buffer_head * bh; | |
235 | struct sysv_inode * raw_inode; | |
236 | struct sysv_inode_info * si; | |
237 | unsigned int ino, block; | |
05459ca8 | 238 | int err = 0; |
1da177e4 LT |
239 | |
240 | ino = inode->i_ino; | |
241 | if (!ino || ino > sbi->s_ninodes) { | |
242 | printk("Bad inode number on dev %s: %d is out of range\n", | |
243 | inode->i_sb->s_id, ino); | |
05459ca8 | 244 | return -EIO; |
1da177e4 LT |
245 | } |
246 | raw_inode = sysv_raw_inode(sb, ino, &bh); | |
247 | if (!raw_inode) { | |
248 | printk("unable to read i-node block\n"); | |
05459ca8 | 249 | return -EIO; |
1da177e4 LT |
250 | } |
251 | ||
252 | raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); | |
a726ecce EB |
253 | raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode))); |
254 | raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode))); | |
1da177e4 LT |
255 | raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); |
256 | raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); | |
257 | raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); | |
258 | raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); | |
259 | raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); | |
260 | ||
261 | si = SYSV_I(inode); | |
262 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
263 | si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); | |
264 | for (block = 0; block < 10+1+1+1; block++) | |
265 | write3byte(sbi, (u8 *)&si->i_data[block], | |
266 | &raw_inode->i_data[3*block]); | |
267 | mark_buffer_dirty(bh); | |
05459ca8 AV |
268 | if (wait) { |
269 | sync_dirty_buffer(bh); | |
270 | if (buffer_req(bh) && !buffer_uptodate(bh)) { | |
271 | printk ("IO error syncing sysv inode [%s:%08x]\n", | |
272 | sb->s_id, ino); | |
273 | err = -EIO; | |
274 | } | |
275 | } | |
1da177e4 | 276 | brelse(bh); |
1da177e4 LT |
277 | return 0; |
278 | } | |
279 | ||
a9185b41 CH |
280 | int sysv_write_inode(struct inode *inode, struct writeback_control *wbc) |
281 | { | |
282 | return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
283 | } | |
284 | ||
05459ca8 | 285 | int sysv_sync_inode(struct inode *inode) |
1da177e4 | 286 | { |
a9185b41 | 287 | return __sysv_write_inode(inode, 1); |
1da177e4 LT |
288 | } |
289 | ||
d299eadc | 290 | static void sysv_evict_inode(struct inode *inode) |
1da177e4 | 291 | { |
fef26658 | 292 | truncate_inode_pages(&inode->i_data, 0); |
d299eadc AV |
293 | if (!inode->i_nlink) { |
294 | inode->i_size = 0; | |
295 | sysv_truncate(inode); | |
296 | } | |
297 | invalidate_inode_buffers(inode); | |
dbd5768f | 298 | clear_inode(inode); |
d299eadc AV |
299 | if (!inode->i_nlink) |
300 | sysv_free_inode(inode); | |
1da177e4 LT |
301 | } |
302 | ||
e18b890b | 303 | static struct kmem_cache *sysv_inode_cachep; |
1da177e4 LT |
304 | |
305 | static struct inode *sysv_alloc_inode(struct super_block *sb) | |
306 | { | |
307 | struct sysv_inode_info *si; | |
308 | ||
e94b1766 | 309 | si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
310 | if (!si) |
311 | return NULL; | |
312 | return &si->vfs_inode; | |
313 | } | |
314 | ||
fa0d7e3d | 315 | static void sysv_i_callback(struct rcu_head *head) |
1da177e4 | 316 | { |
fa0d7e3d | 317 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
318 | kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); |
319 | } | |
320 | ||
fa0d7e3d NP |
321 | static void sysv_destroy_inode(struct inode *inode) |
322 | { | |
323 | call_rcu(&inode->i_rcu, sysv_i_callback); | |
324 | } | |
325 | ||
51cc5068 | 326 | static void init_once(void *p) |
1da177e4 LT |
327 | { |
328 | struct sysv_inode_info *si = (struct sysv_inode_info *)p; | |
329 | ||
a35afb83 | 330 | inode_init_once(&si->vfs_inode); |
1da177e4 LT |
331 | } |
332 | ||
ee9b6d61 | 333 | const struct super_operations sysv_sops = { |
1da177e4 LT |
334 | .alloc_inode = sysv_alloc_inode, |
335 | .destroy_inode = sysv_destroy_inode, | |
1da177e4 | 336 | .write_inode = sysv_write_inode, |
d299eadc | 337 | .evict_inode = sysv_evict_inode, |
1da177e4 | 338 | .put_super = sysv_put_super, |
ad43ffde | 339 | .sync_fs = sysv_sync_fs, |
1da177e4 LT |
340 | .remount_fs = sysv_remount, |
341 | .statfs = sysv_statfs, | |
342 | }; | |
343 | ||
344 | int __init sysv_init_icache(void) | |
345 | { | |
346 | sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", | |
347 | sizeof(struct sysv_inode_info), 0, | |
4b6a9316 | 348 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
20c2df83 | 349 | init_once); |
1da177e4 LT |
350 | if (!sysv_inode_cachep) |
351 | return -ENOMEM; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | void sysv_destroy_icache(void) | |
356 | { | |
8c0a8537 KS |
357 | /* |
358 | * Make sure all delayed rcu free inodes are flushed before we | |
359 | * destroy cache. | |
360 | */ | |
361 | rcu_barrier(); | |
1da177e4 LT |
362 | kmem_cache_destroy(sysv_inode_cachep); |
363 | } |