blob: fa33eceb00113d05bb826a15300c9971e45cb348 [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
88static 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 */
105static 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
126static 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
144static 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
151void 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
171static 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
218bad_inode:
219 make_bad_inode(inode);
220 return;
221}
222
223static 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
263int 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
273int 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
293static void sysv_delete_inode(struct inode *inode)
294{
Mark Fashehfef26652005-09-09 13:01:31 -0700295 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 inode->i_size = 0;
297 sysv_truncate(inode);
298 lock_kernel();
299 sysv_free_inode(inode);
300 unlock_kernel();
301}
302
303static kmem_cache_t *sysv_inode_cachep;
304
305static struct inode *sysv_alloc_inode(struct super_block *sb)
306{
307 struct sysv_inode_info *si;
308
309 si = kmem_cache_alloc(sysv_inode_cachep, SLAB_KERNEL);
310 if (!si)
311 return NULL;
312 return &si->vfs_inode;
313}
314
315static void sysv_destroy_inode(struct inode *inode)
316{
317 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
318}
319
320static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
321{
322 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
323
324 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
325 SLAB_CTOR_CONSTRUCTOR)
326 inode_init_once(&si->vfs_inode);
327}
328
329struct super_operations sysv_sops = {
330 .alloc_inode = sysv_alloc_inode,
331 .destroy_inode = sysv_destroy_inode,
332 .read_inode = sysv_read_inode,
333 .write_inode = sysv_write_inode,
334 .delete_inode = sysv_delete_inode,
335 .put_super = sysv_put_super,
336 .write_super = sysv_write_super,
337 .remount_fs = sysv_remount,
338 .statfs = sysv_statfs,
339};
340
341int __init sysv_init_icache(void)
342{
343 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
344 sizeof(struct sysv_inode_info), 0,
345 SLAB_RECLAIM_ACCOUNT,
346 init_once, NULL);
347 if (!sysv_inode_cachep)
348 return -ENOMEM;
349 return 0;
350}
351
352void sysv_destroy_icache(void)
353{
354 kmem_cache_destroy(sysv_inode_cachep);
355}