blob: 58b2d22142ba67dc81aa8d9bff0f909808d4c250 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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. */
34static 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 }
55clean:
56 sb->s_dirt = 0;
57 unlock_kernel();
58}
59
60static 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
70static 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
David Howells726c3342006-06-23 02:02:58 -070088static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
David Howells726c3342006-06-23 02:02:58 -070090 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 struct sysv_sb_info *sbi = SYSV_SB(sb);
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;
100 return 0;
101}
102
103/*
104 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
105 */
106static inline void read3byte(struct sysv_sb_info *sbi,
107 unsigned char * from, unsigned char * to)
108{
109 if (sbi->s_bytesex == BYTESEX_PDP) {
110 to[0] = from[0];
111 to[1] = 0;
112 to[2] = from[1];
113 to[3] = from[2];
114 } else if (sbi->s_bytesex == BYTESEX_LE) {
115 to[0] = from[0];
116 to[1] = from[1];
117 to[2] = from[2];
118 to[3] = 0;
119 } else {
120 to[0] = 0;
121 to[1] = from[0];
122 to[2] = from[1];
123 to[3] = from[2];
124 }
125}
126
127static inline void write3byte(struct sysv_sb_info *sbi,
128 unsigned char * from, unsigned char * to)
129{
130 if (sbi->s_bytesex == BYTESEX_PDP) {
131 to[0] = from[0];
132 to[1] = from[2];
133 to[2] = from[3];
134 } else if (sbi->s_bytesex == BYTESEX_LE) {
135 to[0] = from[0];
136 to[1] = from[1];
137 to[2] = from[2];
138 } else {
139 to[0] = from[1];
140 to[1] = from[2];
141 to[2] = from[3];
142 }
143}
144
145static struct inode_operations sysv_symlink_inode_operations = {
146 .readlink = generic_readlink,
147 .follow_link = page_follow_link_light,
148 .put_link = page_put_link,
149 .getattr = sysv_getattr,
150};
151
152void sysv_set_inode(struct inode *inode, dev_t rdev)
153{
154 if (S_ISREG(inode->i_mode)) {
155 inode->i_op = &sysv_file_inode_operations;
156 inode->i_fop = &sysv_file_operations;
157 inode->i_mapping->a_ops = &sysv_aops;
158 } else if (S_ISDIR(inode->i_mode)) {
159 inode->i_op = &sysv_dir_inode_operations;
160 inode->i_fop = &sysv_dir_operations;
161 inode->i_mapping->a_ops = &sysv_aops;
162 } else if (S_ISLNK(inode->i_mode)) {
163 if (inode->i_blocks) {
164 inode->i_op = &sysv_symlink_inode_operations;
165 inode->i_mapping->a_ops = &sysv_aops;
166 } else
167 inode->i_op = &sysv_fast_symlink_inode_operations;
168 } else
169 init_special_inode(inode, inode->i_mode, rdev);
170}
171
172static void sysv_read_inode(struct inode *inode)
173{
174 struct super_block * sb = inode->i_sb;
175 struct sysv_sb_info * sbi = SYSV_SB(sb);
176 struct buffer_head * bh;
177 struct sysv_inode * raw_inode;
178 struct sysv_inode_info * si;
179 unsigned int block, ino = inode->i_ino;
180
181 if (!ino || ino > sbi->s_ninodes) {
182 printk("Bad inode number on dev %s: %d is out of range\n",
183 inode->i_sb->s_id, ino);
184 goto bad_inode;
185 }
186 raw_inode = sysv_raw_inode(sb, ino, &bh);
187 if (!raw_inode) {
188 printk("Major problem: unable to read inode from dev %s\n",
189 inode->i_sb->s_id);
190 goto bad_inode;
191 }
192 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
193 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
194 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
195 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
196 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
197 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
198 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
199 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
200 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
201 inode->i_ctime.tv_nsec = 0;
202 inode->i_atime.tv_nsec = 0;
203 inode->i_mtime.tv_nsec = 0;
204 inode->i_blocks = inode->i_blksize = 0;
205
206 si = SYSV_I(inode);
207 for (block = 0; block < 10+1+1+1; block++)
208 read3byte(sbi, &raw_inode->i_data[3*block],
209 (u8 *)&si->i_data[block]);
210 brelse(bh);
211 si->i_dir_start_lookup = 0;
212 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
213 sysv_set_inode(inode,
214 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
215 else
216 sysv_set_inode(inode, 0);
217 return;
218
219bad_inode:
220 make_bad_inode(inode);
221 return;
222}
223
224static struct buffer_head * sysv_update_inode(struct inode * inode)
225{
226 struct super_block * sb = inode->i_sb;
227 struct sysv_sb_info * sbi = SYSV_SB(sb);
228 struct buffer_head * bh;
229 struct sysv_inode * raw_inode;
230 struct sysv_inode_info * si;
231 unsigned int ino, block;
232
233 ino = inode->i_ino;
234 if (!ino || ino > sbi->s_ninodes) {
235 printk("Bad inode number on dev %s: %d is out of range\n",
236 inode->i_sb->s_id, ino);
237 return NULL;
238 }
239 raw_inode = sysv_raw_inode(sb, ino, &bh);
240 if (!raw_inode) {
241 printk("unable to read i-node block\n");
242 return NULL;
243 }
244
245 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
246 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
247 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
248 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
249 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
250 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
251 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
252 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
253
254 si = SYSV_I(inode);
255 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
256 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
257 for (block = 0; block < 10+1+1+1; block++)
258 write3byte(sbi, (u8 *)&si->i_data[block],
259 &raw_inode->i_data[3*block]);
260 mark_buffer_dirty(bh);
261 return bh;
262}
263
264int sysv_write_inode(struct inode * inode, int wait)
265{
266 struct buffer_head *bh;
267 lock_kernel();
268 bh = sysv_update_inode(inode);
269 brelse(bh);
270 unlock_kernel();
271 return 0;
272}
273
274int sysv_sync_inode(struct inode * inode)
275{
276 int err = 0;
277 struct buffer_head *bh;
278
279 bh = sysv_update_inode(inode);
280 if (bh && buffer_dirty(bh)) {
281 sync_dirty_buffer(bh);
282 if (buffer_req(bh) && !buffer_uptodate(bh)) {
283 printk ("IO error syncing sysv inode [%s:%08lx]\n",
284 inode->i_sb->s_id, inode->i_ino);
285 err = -1;
286 }
287 }
288 else if (!bh)
289 err = -1;
290 brelse (bh);
291 return err;
292}
293
294static void sysv_delete_inode(struct inode *inode)
295{
Mark Fashehfef26652005-09-09 13:01:31 -0700296 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 inode->i_size = 0;
298 sysv_truncate(inode);
299 lock_kernel();
300 sysv_free_inode(inode);
301 unlock_kernel();
302}
303
304static kmem_cache_t *sysv_inode_cachep;
305
306static struct inode *sysv_alloc_inode(struct super_block *sb)
307{
308 struct sysv_inode_info *si;
309
310 si = kmem_cache_alloc(sysv_inode_cachep, SLAB_KERNEL);
311 if (!si)
312 return NULL;
313 return &si->vfs_inode;
314}
315
316static void sysv_destroy_inode(struct inode *inode)
317{
318 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
319}
320
321static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
322{
323 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
324
325 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
326 SLAB_CTOR_CONSTRUCTOR)
327 inode_init_once(&si->vfs_inode);
328}
329
330struct super_operations sysv_sops = {
331 .alloc_inode = sysv_alloc_inode,
332 .destroy_inode = sysv_destroy_inode,
333 .read_inode = sysv_read_inode,
334 .write_inode = sysv_write_inode,
335 .delete_inode = sysv_delete_inode,
336 .put_super = sysv_put_super,
337 .write_super = sysv_write_super,
338 .remount_fs = sysv_remount,
339 .statfs = sysv_statfs,
340};
341
342int __init sysv_init_icache(void)
343{
344 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
345 sizeof(struct sysv_inode_info), 0,
Paul Jackson4b6a9312006-03-24 03:16:05 -0800346 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 init_once, NULL);
348 if (!sysv_inode_cachep)
349 return -ENOMEM;
350 return 0;
351}
352
353void sysv_destroy_icache(void)
354{
355 kmem_cache_destroy(sysv_inode_cachep);
356}