2 * linux/fs/sysv/inode.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 * Copyright (C) 1992 Doug Evans
11 * Copyright (C) 1993 Pascal Haible, Bruno Haible
14 * Copyright (C) 1993 Paul B. Monday
17 * Copyright (C) 1993 Bruno Haible
18 * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
20 * This file contains code for allocating/freeing inodes and for read/writing
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>
33 /* This is only called on sync() and umount(), when s_dirt=1. */
34 static void sysv_write_super(struct super_block *sb)
36 struct sysv_sb_info *sbi = SYSV_SB(sb);
37 unsigned long time = get_seconds(), old_time;
40 if (sb->s_flags & MS_RDONLY)
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.
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);
60 static int sysv_remount(struct super_block *sb, int *flags, char *data)
62 struct sysv_sb_info *sbi = SYSV_SB(sb);
65 if (!(*flags & MS_RDONLY))
70 static void sysv_put_super(struct super_block *sb)
72 struct sysv_sb_info *sbi = SYSV_SB(sb);
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);
82 if (sbi->s_bh1 != sbi->s_bh2)
88 static int sysv_statfs(struct super_block *sb, struct kstatfs *buf)
90 struct sysv_sb_info *sbi = SYSV_SB(sb);
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;
103 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
105 static inline void read3byte(struct sysv_sb_info *sbi,
106 unsigned char * from, unsigned char * to)
108 if (sbi->s_bytesex == BYTESEX_PDP) {
113 } else if (sbi->s_bytesex == BYTESEX_LE) {
126 static inline void write3byte(struct sysv_sb_info *sbi,
127 unsigned char * from, unsigned char * to)
129 if (sbi->s_bytesex == BYTESEX_PDP) {
133 } else if (sbi->s_bytesex == BYTESEX_LE) {
144 static struct inode_operations sysv_symlink_inode_operations = {
145 .readlink = page_readlink,
146 .follow_link = page_follow_link,
147 .getattr = sysv_getattr,
150 void sysv_set_inode(struct inode *inode, dev_t rdev)
152 if (S_ISREG(inode->i_mode)) {
153 inode->i_op = &sysv_file_inode_operations;
154 inode->i_fop = &sysv_file_operations;
155 inode->i_mapping->a_ops = &sysv_aops;
156 } else if (S_ISDIR(inode->i_mode)) {
157 inode->i_op = &sysv_dir_inode_operations;
158 inode->i_fop = &sysv_dir_operations;
159 inode->i_mapping->a_ops = &sysv_aops;
160 } else if (S_ISLNK(inode->i_mode)) {
161 if (inode->i_blocks) {
162 inode->i_op = &sysv_symlink_inode_operations;
163 inode->i_mapping->a_ops = &sysv_aops;
165 inode->i_op = &sysv_fast_symlink_inode_operations;
167 init_special_inode(inode, inode->i_mode, rdev);
170 static void sysv_read_inode(struct inode *inode)
172 struct super_block * sb = inode->i_sb;
173 struct sysv_sb_info * sbi = SYSV_SB(sb);
174 struct buffer_head * bh;
175 struct sysv_inode * raw_inode;
176 struct sysv_inode_info * si;
177 unsigned int block, ino = inode->i_ino;
179 if (!ino || ino > sbi->s_ninodes) {
180 printk("Bad inode number on dev %s: %d is out of range\n",
181 inode->i_sb->s_id, ino);
184 raw_inode = sysv_raw_inode(sb, ino, &bh);
186 printk("Major problem: unable to read inode from dev %s\n",
190 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
191 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
192 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
193 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
194 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
195 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
196 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
197 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
198 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
199 inode->i_ctime.tv_nsec = 0;
200 inode->i_atime.tv_nsec = 0;
201 inode->i_mtime.tv_nsec = 0;
202 inode->i_blocks = inode->i_blksize = 0;
205 for (block = 0; block < 10+1+1+1; block++)
206 read3byte(sbi, &raw_inode->i_data[3*block],
207 (u8 *)&si->i_data[block]);
209 si->i_dir_start_lookup = 0;
210 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
211 sysv_set_inode(inode,
212 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
214 sysv_set_inode(inode, 0);
218 make_bad_inode(inode);
222 static struct buffer_head * sysv_update_inode(struct inode * inode)
224 struct super_block * sb = inode->i_sb;
225 struct sysv_sb_info * sbi = SYSV_SB(sb);
226 struct buffer_head * bh;
227 struct sysv_inode * raw_inode;
228 struct sysv_inode_info * si;
229 unsigned int ino, block;
232 if (!ino || ino > sbi->s_ninodes) {
233 printk("Bad inode number on dev %s: %d is out of range\n",
234 inode->i_sb->s_id, ino);
237 raw_inode = sysv_raw_inode(sb, ino, &bh);
239 printk("unable to read i-node block\n");
243 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
244 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
245 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
246 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
247 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
248 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
249 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
250 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
253 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
254 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
255 for (block = 0; block < 10+1+1+1; block++)
256 write3byte(sbi, (u8 *)&si->i_data[block],
257 &raw_inode->i_data[3*block]);
258 mark_buffer_dirty(bh);
262 void sysv_write_inode(struct inode * inode, int wait)
264 struct buffer_head *bh;
266 bh = sysv_update_inode(inode);
271 int sysv_sync_inode(struct inode * inode)
274 struct buffer_head *bh;
276 bh = sysv_update_inode(inode);
277 if (bh && buffer_dirty(bh)) {
278 sync_dirty_buffer(bh);
279 if (buffer_req(bh) && !buffer_uptodate(bh)) {
280 printk ("IO error syncing sysv inode [%s:%08lx]\n",
281 inode->i_sb->s_id, inode->i_ino);
291 static void sysv_delete_inode(struct inode *inode)
294 sysv_truncate(inode);
296 sysv_free_inode(inode);
300 static kmem_cache_t *sysv_inode_cachep;
302 static struct inode *sysv_alloc_inode(struct super_block *sb)
304 struct sysv_inode_info *si;
306 si = kmem_cache_alloc(sysv_inode_cachep, SLAB_KERNEL);
309 return &si->vfs_inode;
312 static void sysv_destroy_inode(struct inode *inode)
314 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
317 static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
319 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
321 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
322 SLAB_CTOR_CONSTRUCTOR)
323 inode_init_once(&si->vfs_inode);
326 struct super_operations sysv_sops = {
327 .alloc_inode = sysv_alloc_inode,
328 .destroy_inode = sysv_destroy_inode,
329 .read_inode = sysv_read_inode,
330 .write_inode = sysv_write_inode,
331 .delete_inode = sysv_delete_inode,
332 .put_super = sysv_put_super,
333 .write_super = sysv_write_super,
334 .remount_fs = sysv_remount,
335 .statfs = sysv_statfs,
338 int __init sysv_init_icache(void)
340 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
341 sizeof(struct sysv_inode_info), 0,
342 SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
344 if (!sysv_inode_cachep)
349 void sysv_destroy_icache(void)
351 kmem_cache_destroy(sysv_inode_cachep);