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 | ||
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/highuid.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/buffer_head.h> | |
29 | #include <linux/vfs.h> | |
30 | #include <asm/byteorder.h> | |
31 | #include "sysv.h" | |
32 | ||
33 | /* This is only called on sync() and umount(), when s_dirt=1. */ | |
34 | static void sysv_write_super(struct super_block *sb) | |
35 | { | |
36 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
37 | unsigned long time = get_seconds(), old_time; | |
38 | ||
39 | lock_kernel(); | |
40 | if (sb->s_flags & MS_RDONLY) | |
41 | goto clean; | |
42 | ||
43 | /* | |
44 | * If we are going to write out the super block, | |
45 | * then attach current time stamp. | |
46 | * But if the filesystem was marked clean, keep it clean. | |
47 | */ | |
48 | old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); | |
49 | if (sbi->s_type == FSTYPE_SYSV4) { | |
50 | if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time)) | |
51 | *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time); | |
52 | *sbi->s_sb_time = cpu_to_fs32(sbi, time); | |
53 | mark_buffer_dirty(sbi->s_bh2); | |
54 | } | |
55 | clean: | |
56 | sb->s_dirt = 0; | |
57 | unlock_kernel(); | |
58 | } | |
59 | ||
60 | static int sysv_remount(struct super_block *sb, int *flags, char *data) | |
61 | { | |
62 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
63 | if (sbi->s_forced_ro) | |
64 | *flags |= MS_RDONLY; | |
65 | if (!(*flags & MS_RDONLY)) | |
66 | sb->s_dirt = 1; | |
67 | return 0; | |
68 | } | |
69 | ||
70 | static void sysv_put_super(struct super_block *sb) | |
71 | { | |
72 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
73 | ||
74 | if (!(sb->s_flags & MS_RDONLY)) { | |
75 | /* XXX ext2 also updates the state here */ | |
76 | mark_buffer_dirty(sbi->s_bh1); | |
77 | if (sbi->s_bh1 != sbi->s_bh2) | |
78 | mark_buffer_dirty(sbi->s_bh2); | |
79 | } | |
80 | ||
81 | brelse(sbi->s_bh1); | |
82 | if (sbi->s_bh1 != sbi->s_bh2) | |
83 | brelse(sbi->s_bh2); | |
84 | ||
85 | kfree(sbi); | |
86 | } | |
87 | ||
88 | static int sysv_statfs(struct super_block *sb, struct kstatfs *buf) | |
89 | { | |
90 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
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; | |
99 | return 0; | |
100 | } | |
101 | ||
102 | /* | |
103 | * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 | |
104 | */ | |
105 | static inline void read3byte(struct sysv_sb_info *sbi, | |
106 | unsigned char * from, unsigned char * to) | |
107 | { | |
108 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
109 | to[0] = from[0]; | |
110 | to[1] = 0; | |
111 | to[2] = from[1]; | |
112 | to[3] = from[2]; | |
113 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
114 | to[0] = from[0]; | |
115 | to[1] = from[1]; | |
116 | to[2] = from[2]; | |
117 | to[3] = 0; | |
118 | } else { | |
119 | to[0] = 0; | |
120 | to[1] = from[0]; | |
121 | to[2] = from[1]; | |
122 | to[3] = from[2]; | |
123 | } | |
124 | } | |
125 | ||
126 | static inline void write3byte(struct sysv_sb_info *sbi, | |
127 | unsigned char * from, unsigned char * to) | |
128 | { | |
129 | if (sbi->s_bytesex == BYTESEX_PDP) { | |
130 | to[0] = from[0]; | |
131 | to[1] = from[2]; | |
132 | to[2] = from[3]; | |
133 | } else if (sbi->s_bytesex == BYTESEX_LE) { | |
134 | to[0] = from[0]; | |
135 | to[1] = from[1]; | |
136 | to[2] = from[2]; | |
137 | } else { | |
138 | to[0] = from[1]; | |
139 | to[1] = from[2]; | |
140 | to[2] = from[3]; | |
141 | } | |
142 | } | |
143 | ||
144 | static struct inode_operations sysv_symlink_inode_operations = { | |
145 | .readlink = generic_readlink, | |
146 | .follow_link = page_follow_link_light, | |
147 | .put_link = page_put_link, | |
148 | .getattr = sysv_getattr, | |
149 | }; | |
150 | ||
151 | void sysv_set_inode(struct inode *inode, dev_t rdev) | |
152 | { | |
153 | if (S_ISREG(inode->i_mode)) { | |
154 | inode->i_op = &sysv_file_inode_operations; | |
155 | inode->i_fop = &sysv_file_operations; | |
156 | inode->i_mapping->a_ops = &sysv_aops; | |
157 | } else if (S_ISDIR(inode->i_mode)) { | |
158 | inode->i_op = &sysv_dir_inode_operations; | |
159 | inode->i_fop = &sysv_dir_operations; | |
160 | inode->i_mapping->a_ops = &sysv_aops; | |
161 | } else if (S_ISLNK(inode->i_mode)) { | |
162 | if (inode->i_blocks) { | |
163 | inode->i_op = &sysv_symlink_inode_operations; | |
164 | inode->i_mapping->a_ops = &sysv_aops; | |
165 | } else | |
166 | inode->i_op = &sysv_fast_symlink_inode_operations; | |
167 | } else | |
168 | init_special_inode(inode, inode->i_mode, rdev); | |
169 | } | |
170 | ||
171 | static void sysv_read_inode(struct inode *inode) | |
172 | { | |
173 | struct super_block * sb = inode->i_sb; | |
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; | |
178 | unsigned int block, ino = inode->i_ino; | |
179 | ||
180 | if (!ino || ino > sbi->s_ninodes) { | |
181 | printk("Bad inode number on dev %s: %d is out of range\n", | |
182 | inode->i_sb->s_id, ino); | |
183 | goto bad_inode; | |
184 | } | |
185 | raw_inode = sysv_raw_inode(sb, ino, &bh); | |
186 | if (!raw_inode) { | |
187 | printk("Major problem: unable to read inode from dev %s\n", | |
188 | inode->i_sb->s_id); | |
189 | goto bad_inode; | |
190 | } | |
191 | /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ | |
192 | inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); | |
193 | inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid); | |
194 | inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid); | |
195 | inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink); | |
196 | inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); | |
197 | inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); | |
198 | inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); | |
199 | inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); | |
200 | inode->i_ctime.tv_nsec = 0; | |
201 | inode->i_atime.tv_nsec = 0; | |
202 | inode->i_mtime.tv_nsec = 0; | |
203 | inode->i_blocks = inode->i_blksize = 0; | |
204 | ||
205 | si = SYSV_I(inode); | |
206 | for (block = 0; block < 10+1+1+1; block++) | |
207 | read3byte(sbi, &raw_inode->i_data[3*block], | |
208 | (u8 *)&si->i_data[block]); | |
209 | brelse(bh); | |
210 | si->i_dir_start_lookup = 0; | |
211 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
212 | sysv_set_inode(inode, | |
213 | old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); | |
214 | else | |
215 | sysv_set_inode(inode, 0); | |
216 | return; | |
217 | ||
218 | bad_inode: | |
219 | make_bad_inode(inode); | |
220 | return; | |
221 | } | |
222 | ||
223 | static struct buffer_head * sysv_update_inode(struct inode * inode) | |
224 | { | |
225 | struct super_block * sb = inode->i_sb; | |
226 | struct sysv_sb_info * sbi = SYSV_SB(sb); | |
227 | struct buffer_head * bh; | |
228 | struct sysv_inode * raw_inode; | |
229 | struct sysv_inode_info * si; | |
230 | unsigned int ino, block; | |
231 | ||
232 | ino = inode->i_ino; | |
233 | if (!ino || ino > sbi->s_ninodes) { | |
234 | printk("Bad inode number on dev %s: %d is out of range\n", | |
235 | inode->i_sb->s_id, ino); | |
236 | return NULL; | |
237 | } | |
238 | raw_inode = sysv_raw_inode(sb, ino, &bh); | |
239 | if (!raw_inode) { | |
240 | printk("unable to read i-node block\n"); | |
241 | return NULL; | |
242 | } | |
243 | ||
244 | raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); | |
245 | raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid)); | |
246 | raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid)); | |
247 | raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); | |
248 | raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); | |
249 | raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); | |
250 | raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); | |
251 | raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); | |
252 | ||
253 | si = SYSV_I(inode); | |
254 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
255 | si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); | |
256 | for (block = 0; block < 10+1+1+1; block++) | |
257 | write3byte(sbi, (u8 *)&si->i_data[block], | |
258 | &raw_inode->i_data[3*block]); | |
259 | mark_buffer_dirty(bh); | |
260 | return bh; | |
261 | } | |
262 | ||
263 | int sysv_write_inode(struct inode * inode, int wait) | |
264 | { | |
265 | struct buffer_head *bh; | |
266 | lock_kernel(); | |
267 | bh = sysv_update_inode(inode); | |
268 | brelse(bh); | |
269 | unlock_kernel(); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | int sysv_sync_inode(struct inode * inode) | |
274 | { | |
275 | int err = 0; | |
276 | struct buffer_head *bh; | |
277 | ||
278 | bh = sysv_update_inode(inode); | |
279 | if (bh && buffer_dirty(bh)) { | |
280 | sync_dirty_buffer(bh); | |
281 | if (buffer_req(bh) && !buffer_uptodate(bh)) { | |
282 | printk ("IO error syncing sysv inode [%s:%08lx]\n", | |
283 | inode->i_sb->s_id, inode->i_ino); | |
284 | err = -1; | |
285 | } | |
286 | } | |
287 | else if (!bh) | |
288 | err = -1; | |
289 | brelse (bh); | |
290 | return err; | |
291 | } | |
292 | ||
293 | static void sysv_delete_inode(struct inode *inode) | |
294 | { | |
295 | inode->i_size = 0; | |
296 | sysv_truncate(inode); | |
297 | lock_kernel(); | |
298 | sysv_free_inode(inode); | |
299 | unlock_kernel(); | |
300 | } | |
301 | ||
302 | static kmem_cache_t *sysv_inode_cachep; | |
303 | ||
304 | static struct inode *sysv_alloc_inode(struct super_block *sb) | |
305 | { | |
306 | struct sysv_inode_info *si; | |
307 | ||
308 | si = kmem_cache_alloc(sysv_inode_cachep, SLAB_KERNEL); | |
309 | if (!si) | |
310 | return NULL; | |
311 | return &si->vfs_inode; | |
312 | } | |
313 | ||
314 | static void sysv_destroy_inode(struct inode *inode) | |
315 | { | |
316 | kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); | |
317 | } | |
318 | ||
319 | static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags) | |
320 | { | |
321 | struct sysv_inode_info *si = (struct sysv_inode_info *)p; | |
322 | ||
323 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
324 | SLAB_CTOR_CONSTRUCTOR) | |
325 | inode_init_once(&si->vfs_inode); | |
326 | } | |
327 | ||
328 | struct super_operations sysv_sops = { | |
329 | .alloc_inode = sysv_alloc_inode, | |
330 | .destroy_inode = sysv_destroy_inode, | |
331 | .read_inode = sysv_read_inode, | |
332 | .write_inode = sysv_write_inode, | |
333 | .delete_inode = sysv_delete_inode, | |
334 | .put_super = sysv_put_super, | |
335 | .write_super = sysv_write_super, | |
336 | .remount_fs = sysv_remount, | |
337 | .statfs = sysv_statfs, | |
338 | }; | |
339 | ||
340 | int __init sysv_init_icache(void) | |
341 | { | |
342 | sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", | |
343 | sizeof(struct sysv_inode_info), 0, | |
344 | SLAB_RECLAIM_ACCOUNT, | |
345 | init_once, NULL); | |
346 | if (!sysv_inode_cachep) | |
347 | return -ENOMEM; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | void sysv_destroy_icache(void) | |
352 | { | |
353 | kmem_cache_destroy(sysv_inode_cachep); | |
354 | } |