blob: df0d435baa48da3088b16cad08d982c329bc1227 [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
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800145static const struct inode_operations sysv_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 .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
David Howellsb8e13432008-02-07 00:15:47 -0800172struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 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;
David Howellsb8e13432008-02-07 00:15:47 -0800178 struct inode *inode;
179 unsigned int block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181 if (!ino || ino > sbi->s_ninodes) {
182 printk("Bad inode number on dev %s: %d is out of range\n",
David Howellsb8e13432008-02-07 00:15:47 -0800183 sb->s_id, ino);
184 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
David Howellsb8e13432008-02-07 00:15:47 -0800186
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 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);
201 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
202 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
203 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
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;
Theodore Ts'oba52de12006-09-27 01:50:49 -0700211 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
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);
David Howellsb8e13432008-02-07 00:15:47 -0800224 unlock_new_inode(inode);
225 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227bad_inode:
David Howellsb8e13432008-02-07 00:15:47 -0800228 iget_failed(inode);
229 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
232static struct buffer_head * sysv_update_inode(struct inode * inode)
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;
240
241 ino = inode->i_ino;
242 if (!ino || ino > sbi->s_ninodes) {
243 printk("Bad inode number on dev %s: %d is out of range\n",
244 inode->i_sb->s_id, ino);
245 return NULL;
246 }
247 raw_inode = sysv_raw_inode(sb, ino, &bh);
248 if (!raw_inode) {
249 printk("unable to read i-node block\n");
250 return NULL;
251 }
252
253 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
254 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
255 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
256 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
257 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
258 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
259 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
260 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
261
262 si = SYSV_I(inode);
263 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
264 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
265 for (block = 0; block < 10+1+1+1; block++)
266 write3byte(sbi, (u8 *)&si->i_data[block],
267 &raw_inode->i_data[3*block]);
268 mark_buffer_dirty(bh);
269 return bh;
270}
271
272int sysv_write_inode(struct inode * inode, int wait)
273{
274 struct buffer_head *bh;
275 lock_kernel();
276 bh = sysv_update_inode(inode);
277 brelse(bh);
278 unlock_kernel();
279 return 0;
280}
281
282int sysv_sync_inode(struct inode * inode)
283{
284 int err = 0;
285 struct buffer_head *bh;
286
287 bh = sysv_update_inode(inode);
288 if (bh && buffer_dirty(bh)) {
289 sync_dirty_buffer(bh);
290 if (buffer_req(bh) && !buffer_uptodate(bh)) {
291 printk ("IO error syncing sysv inode [%s:%08lx]\n",
292 inode->i_sb->s_id, inode->i_ino);
293 err = -1;
294 }
295 }
296 else if (!bh)
297 err = -1;
298 brelse (bh);
299 return err;
300}
301
302static void sysv_delete_inode(struct inode *inode)
303{
Mark Fashehfef26652005-09-09 13:01:31 -0700304 truncate_inode_pages(&inode->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 inode->i_size = 0;
306 sysv_truncate(inode);
307 lock_kernel();
308 sysv_free_inode(inode);
309 unlock_kernel();
310}
311
Christoph Lametere18b8902006-12-06 20:33:20 -0800312static struct kmem_cache *sysv_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314static struct inode *sysv_alloc_inode(struct super_block *sb)
315{
316 struct sysv_inode_info *si;
317
Christoph Lametere94b1762006-12-06 20:33:17 -0800318 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 if (!si)
320 return NULL;
321 return &si->vfs_inode;
322}
323
324static void sysv_destroy_inode(struct inode *inode)
325{
326 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
327}
328
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700329static void init_once(void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
331 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
332
Christoph Lametera35afb82007-05-16 22:10:57 -0700333 inode_init_once(&si->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
335
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800336const struct super_operations sysv_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 .alloc_inode = sysv_alloc_inode,
338 .destroy_inode = sysv_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 .write_inode = sysv_write_inode,
340 .delete_inode = sysv_delete_inode,
341 .put_super = sysv_put_super,
342 .write_super = sysv_write_super,
343 .remount_fs = sysv_remount,
344 .statfs = sysv_statfs,
345};
346
347int __init sysv_init_icache(void)
348{
349 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
350 sizeof(struct sysv_inode_info), 0,
Paul Jackson4b6a9312006-03-24 03:16:05 -0800351 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +0900352 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 if (!sysv_inode_cachep)
354 return -ENOMEM;
355 return 0;
356}
357
358void sysv_destroy_icache(void)
359{
360 kmem_cache_destroy(sysv_inode_cachep);
361}