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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 | ||
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 | |
02b9984d | 63 | sync_filesystem(sb); |
1da177e4 LT |
64 | if (sbi->s_forced_ro) |
65 | *flags |= MS_RDONLY; | |
1da177e4 LT |
66 | return 0; |
67 | } | |
68 | ||
69 | static void sysv_put_super(struct super_block *sb) | |
70 | { | |
71 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
72 | ||
73 | if (!(sb->s_flags & MS_RDONLY)) { | |
74 | /* XXX ext2 also updates the state here */ | |
75 | mark_buffer_dirty(sbi->s_bh1); | |
76 | if (sbi->s_bh1 != sbi->s_bh2) | |
77 | mark_buffer_dirty(sbi->s_bh2); | |
78 | } | |
79 | ||
80 | brelse(sbi->s_bh1); | |
81 | if (sbi->s_bh1 != sbi->s_bh2) | |
82 | brelse(sbi->s_bh2); | |
83 | ||
84 | kfree(sbi); | |
85 | } | |
86 | ||
726c3342 | 87 | static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 88 | { |
726c3342 | 89 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 90 | struct sysv_sb_info *sbi = SYSV_SB(sb); |
1c5b4541 | 91 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
92 | |
93 | buf->f_type = sb->s_magic; | |
94 | buf->f_bsize = sb->s_blocksize; | |
95 | buf->f_blocks = sbi->s_ndatazones; | |
96 | buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb); | |
97 | buf->f_files = sbi->s_ninodes; | |
98 | buf->f_ffree = sysv_count_free_inodes(sb); | |
99 | buf->f_namelen = SYSV_NAMELEN; | |
1c5b4541 CL |
100 | buf->f_fsid.val[0] = (u32)id; |
101 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
102 | return 0; |
103 | } | |
104 | ||
105 | /* | |
106 | * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 | |
107 | */ | |
108 | static inline void read3byte(struct sysv_sb_info *sbi, | |
109 | unsigned char * from, unsigned char * to) | |
110 | { | |
111 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
112 | to[0] = from[0]; | |
113 | to[1] = 0; | |
114 | to[2] = from[1]; | |
115 | to[3] = from[2]; | |
116 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
117 | to[0] = from[0]; | |
118 | to[1] = from[1]; | |
119 | to[2] = from[2]; | |
120 | to[3] = 0; | |
121 | } else { | |
122 | to[0] = 0; | |
123 | to[1] = from[0]; | |
124 | to[2] = from[1]; | |
125 | to[3] = from[2]; | |
126 | } | |
127 | } | |
128 | ||
129 | static inline void write3byte(struct sysv_sb_info *sbi, | |
130 | unsigned char * from, unsigned char * to) | |
131 | { | |
132 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
133 | to[0] = from[0]; | |
134 | to[1] = from[2]; | |
135 | to[2] = from[3]; | |
136 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
137 | to[0] = from[0]; | |
138 | to[1] = from[1]; | |
139 | to[2] = from[2]; | |
140 | } else { | |
141 | to[0] = from[1]; | |
142 | to[1] = from[2]; | |
143 | to[2] = from[3]; | |
144 | } | |
145 | } | |
146 | ||
c5ef1c42 | 147 | static const struct inode_operations sysv_symlink_inode_operations = { |
1da177e4 LT |
148 | .readlink = generic_readlink, |
149 | .follow_link = page_follow_link_light, | |
150 | .put_link = page_put_link, | |
151 | .getattr = sysv_getattr, | |
152 | }; | |
153 | ||
154 | void sysv_set_inode(struct inode *inode, dev_t rdev) | |
155 | { | |
156 | if (S_ISREG(inode->i_mode)) { | |
157 | inode->i_op = &sysv_file_inode_operations; | |
158 | inode->i_fop = &sysv_file_operations; | |
159 | inode->i_mapping->a_ops = &sysv_aops; | |
160 | } else if (S_ISDIR(inode->i_mode)) { | |
161 | inode->i_op = &sysv_dir_inode_operations; | |
162 | inode->i_fop = &sysv_dir_operations; | |
163 | inode->i_mapping->a_ops = &sysv_aops; | |
164 | } else if (S_ISLNK(inode->i_mode)) { | |
0ebf7f10 | 165 | inode->i_op = &sysv_symlink_inode_operations; |
21fc61c7 | 166 | inode_nohighmem(inode); |
0ebf7f10 | 167 | inode->i_mapping->a_ops = &sysv_aops; |
1da177e4 LT |
168 | } else |
169 | init_special_inode(inode, inode->i_mode, rdev); | |
170 | } | |
171 | ||
b8e1343f | 172 | struct inode *sysv_iget(struct super_block *sb, unsigned int ino) |
1da177e4 | 173 | { |
1da177e4 LT |
174 | struct sysv_sb_info * sbi = SYSV_SB(sb); |
175 | struct buffer_head * bh; | |
176 | struct sysv_inode * raw_inode; | |
177 | struct sysv_inode_info * si; | |
b8e1343f DH |
178 | struct inode *inode; |
179 | unsigned int block; | |
1da177e4 LT |
180 | |
181 | if (!ino || ino > sbi->s_ninodes) { | |
182 | printk("Bad inode number on dev %s: %d is out of range\n", | |
b8e1343f DH |
183 | sb->s_id, ino); |
184 | return ERR_PTR(-EIO); | |
1da177e4 | 185 | } |
b8e1343f DH |
186 | |
187 | inode = iget_locked(sb, ino); | |
188 | if (!inode) | |
189 | return ERR_PTR(-ENOMEM); | |
190 | if (!(inode->i_state & I_NEW)) | |
191 | return inode; | |
192 | ||
1da177e4 LT |
193 | raw_inode = sysv_raw_inode(sb, ino, &bh); |
194 | if (!raw_inode) { | |
195 | printk("Major problem: unable to read inode from dev %s\n", | |
196 | inode->i_sb->s_id); | |
197 | goto bad_inode; | |
198 | } | |
199 | /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ | |
200 | inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); | |
a726ecce EB |
201 | i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid)); |
202 | i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid)); | |
bfe86848 | 203 | set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink)); |
1da177e4 LT |
204 | inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); |
205 | inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); | |
206 | inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); | |
207 | inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); | |
208 | inode->i_ctime.tv_nsec = 0; | |
209 | inode->i_atime.tv_nsec = 0; | |
210 | inode->i_mtime.tv_nsec = 0; | |
ba52de12 | 211 | inode->i_blocks = 0; |
1da177e4 LT |
212 | |
213 | si = SYSV_I(inode); | |
214 | for (block = 0; block < 10+1+1+1; block++) | |
215 | read3byte(sbi, &raw_inode->i_data[3*block], | |
216 | (u8 *)&si->i_data[block]); | |
217 | brelse(bh); | |
218 | si->i_dir_start_lookup = 0; | |
219 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
220 | sysv_set_inode(inode, | |
221 | old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); | |
222 | else | |
223 | sysv_set_inode(inode, 0); | |
b8e1343f DH |
224 | unlock_new_inode(inode); |
225 | return inode; | |
1da177e4 LT |
226 | |
227 | bad_inode: | |
b8e1343f DH |
228 | iget_failed(inode); |
229 | return ERR_PTR(-EIO); | |
1da177e4 LT |
230 | } |
231 | ||
a9185b41 | 232 | static int __sysv_write_inode(struct inode *inode, int wait) |
1da177e4 LT |
233 | { |
234 | struct super_block * sb = inode->i_sb; | |
235 | struct sysv_sb_info * sbi = SYSV_SB(sb); | |
236 | struct buffer_head * bh; | |
237 | struct sysv_inode * raw_inode; | |
238 | struct sysv_inode_info * si; | |
239 | unsigned int ino, block; | |
05459ca8 | 240 | int err = 0; |
1da177e4 LT |
241 | |
242 | ino = inode->i_ino; | |
243 | if (!ino || ino > sbi->s_ninodes) { | |
244 | printk("Bad inode number on dev %s: %d is out of range\n", | |
245 | inode->i_sb->s_id, ino); | |
05459ca8 | 246 | return -EIO; |
1da177e4 LT |
247 | } |
248 | raw_inode = sysv_raw_inode(sb, ino, &bh); | |
249 | if (!raw_inode) { | |
250 | printk("unable to read i-node block\n"); | |
05459ca8 | 251 | return -EIO; |
1da177e4 LT |
252 | } |
253 | ||
254 | raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); | |
a726ecce EB |
255 | raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode))); |
256 | raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode))); | |
1da177e4 LT |
257 | raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); |
258 | raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); | |
259 | raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); | |
260 | raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); | |
261 | raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); | |
262 | ||
263 | si = SYSV_I(inode); | |
264 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
265 | si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); | |
266 | for (block = 0; block < 10+1+1+1; block++) | |
267 | write3byte(sbi, (u8 *)&si->i_data[block], | |
268 | &raw_inode->i_data[3*block]); | |
269 | mark_buffer_dirty(bh); | |
05459ca8 AV |
270 | if (wait) { |
271 | sync_dirty_buffer(bh); | |
272 | if (buffer_req(bh) && !buffer_uptodate(bh)) { | |
273 | printk ("IO error syncing sysv inode [%s:%08x]\n", | |
274 | sb->s_id, ino); | |
275 | err = -EIO; | |
276 | } | |
277 | } | |
1da177e4 | 278 | brelse(bh); |
1da177e4 LT |
279 | return 0; |
280 | } | |
281 | ||
a9185b41 CH |
282 | int sysv_write_inode(struct inode *inode, struct writeback_control *wbc) |
283 | { | |
284 | return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
285 | } | |
286 | ||
05459ca8 | 287 | int sysv_sync_inode(struct inode *inode) |
1da177e4 | 288 | { |
a9185b41 | 289 | return __sysv_write_inode(inode, 1); |
1da177e4 LT |
290 | } |
291 | ||
d299eadc | 292 | static void sysv_evict_inode(struct inode *inode) |
1da177e4 | 293 | { |
91b0abe3 | 294 | truncate_inode_pages_final(&inode->i_data); |
d299eadc AV |
295 | if (!inode->i_nlink) { |
296 | inode->i_size = 0; | |
297 | sysv_truncate(inode); | |
298 | } | |
299 | invalidate_inode_buffers(inode); | |
dbd5768f | 300 | clear_inode(inode); |
d299eadc AV |
301 | if (!inode->i_nlink) |
302 | sysv_free_inode(inode); | |
1da177e4 LT |
303 | } |
304 | ||
e18b890b | 305 | static struct kmem_cache *sysv_inode_cachep; |
1da177e4 LT |
306 | |
307 | static struct inode *sysv_alloc_inode(struct super_block *sb) | |
308 | { | |
309 | struct sysv_inode_info *si; | |
310 | ||
e94b1766 | 311 | si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
312 | if (!si) |
313 | return NULL; | |
314 | return &si->vfs_inode; | |
315 | } | |
316 | ||
fa0d7e3d | 317 | static void sysv_i_callback(struct rcu_head *head) |
1da177e4 | 318 | { |
fa0d7e3d | 319 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
320 | kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); |
321 | } | |
322 | ||
fa0d7e3d NP |
323 | static void sysv_destroy_inode(struct inode *inode) |
324 | { | |
325 | call_rcu(&inode->i_rcu, sysv_i_callback); | |
326 | } | |
327 | ||
51cc5068 | 328 | static void init_once(void *p) |
1da177e4 LT |
329 | { |
330 | struct sysv_inode_info *si = (struct sysv_inode_info *)p; | |
331 | ||
a35afb83 | 332 | inode_init_once(&si->vfs_inode); |
1da177e4 LT |
333 | } |
334 | ||
ee9b6d61 | 335 | const struct super_operations sysv_sops = { |
1da177e4 LT |
336 | .alloc_inode = sysv_alloc_inode, |
337 | .destroy_inode = sysv_destroy_inode, | |
1da177e4 | 338 | .write_inode = sysv_write_inode, |
d299eadc | 339 | .evict_inode = sysv_evict_inode, |
1da177e4 | 340 | .put_super = sysv_put_super, |
ad43ffde | 341 | .sync_fs = sysv_sync_fs, |
1da177e4 LT |
342 | .remount_fs = sysv_remount, |
343 | .statfs = sysv_statfs, | |
344 | }; | |
345 | ||
346 | int __init sysv_init_icache(void) | |
347 | { | |
348 | sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", | |
349 | sizeof(struct sysv_inode_info), 0, | |
4b6a9316 | 350 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
20c2df83 | 351 | init_once); |
1da177e4 LT |
352 | if (!sysv_inode_cachep) |
353 | return -ENOMEM; | |
354 | return 0; | |
355 | } | |
356 | ||
357 | void sysv_destroy_icache(void) | |
358 | { | |
8c0a8537 KS |
359 | /* |
360 | * Make sure all delayed rcu free inodes are flushed before we | |
361 | * destroy cache. | |
362 | */ | |
363 | rcu_barrier(); | |
1da177e4 LT |
364 | kmem_cache_destroy(sysv_inode_cachep); |
365 | } |