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 <linux/namei.h>
31 #include <asm/byteorder.h>
34 /* This is only called on sync() and umount(), when s_dirt=1. */
35 static void sysv_write_super(struct super_block *sb)
37 struct sysv_sb_info *sbi = SYSV_SB(sb);
38 unsigned long time = get_seconds(), old_time;
41 if (sb->s_flags & MS_RDONLY)
45 * If we are going to write out the super block,
46 * then attach current time stamp.
47 * But if the filesystem was marked clean, keep it clean.
49 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
50 if (sbi->s_type == FSTYPE_SYSV4) {
51 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
52 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
53 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
54 mark_buffer_dirty(sbi->s_bh2);
61 static int sysv_remount(struct super_block *sb, int *flags, char *data)
63 struct sysv_sb_info *sbi = SYSV_SB(sb);
66 if (!(*flags & MS_RDONLY))
71 static void sysv_put_super(struct super_block *sb)
73 struct sysv_sb_info *sbi = SYSV_SB(sb);
80 if (!(sb->s_flags & MS_RDONLY)) {
81 /* XXX ext2 also updates the state here */
82 mark_buffer_dirty(sbi->s_bh1);
83 if (sbi->s_bh1 != sbi->s_bh2)
84 mark_buffer_dirty(sbi->s_bh2);
88 if (sbi->s_bh1 != sbi->s_bh2)
96 static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
98 struct super_block *sb = dentry->d_sb;
99 struct sysv_sb_info *sbi = SYSV_SB(sb);
100 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
102 buf->f_type = sb->s_magic;
103 buf->f_bsize = sb->s_blocksize;
104 buf->f_blocks = sbi->s_ndatazones;
105 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
106 buf->f_files = sbi->s_ninodes;
107 buf->f_ffree = sysv_count_free_inodes(sb);
108 buf->f_namelen = SYSV_NAMELEN;
109 buf->f_fsid.val[0] = (u32)id;
110 buf->f_fsid.val[1] = (u32)(id >> 32);
115 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
117 static inline void read3byte(struct sysv_sb_info *sbi,
118 unsigned char * from, unsigned char * to)
120 if (sbi->s_bytesex == BYTESEX_PDP) {
125 } else if (sbi->s_bytesex == BYTESEX_LE) {
138 static inline void write3byte(struct sysv_sb_info *sbi,
139 unsigned char * from, unsigned char * to)
141 if (sbi->s_bytesex == BYTESEX_PDP) {
145 } else if (sbi->s_bytesex == BYTESEX_LE) {
156 static const struct inode_operations sysv_symlink_inode_operations = {
157 .readlink = generic_readlink,
158 .follow_link = page_follow_link_light,
159 .put_link = page_put_link,
160 .getattr = sysv_getattr,
163 void sysv_set_inode(struct inode *inode, dev_t rdev)
165 if (S_ISREG(inode->i_mode)) {
166 inode->i_op = &sysv_file_inode_operations;
167 inode->i_fop = &sysv_file_operations;
168 inode->i_mapping->a_ops = &sysv_aops;
169 } else if (S_ISDIR(inode->i_mode)) {
170 inode->i_op = &sysv_dir_inode_operations;
171 inode->i_fop = &sysv_dir_operations;
172 inode->i_mapping->a_ops = &sysv_aops;
173 } else if (S_ISLNK(inode->i_mode)) {
174 if (inode->i_blocks) {
175 inode->i_op = &sysv_symlink_inode_operations;
176 inode->i_mapping->a_ops = &sysv_aops;
178 inode->i_op = &sysv_fast_symlink_inode_operations;
179 nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
180 sizeof(SYSV_I(inode)->i_data) - 1);
183 init_special_inode(inode, inode->i_mode, rdev);
186 struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
188 struct sysv_sb_info * sbi = SYSV_SB(sb);
189 struct buffer_head * bh;
190 struct sysv_inode * raw_inode;
191 struct sysv_inode_info * si;
195 if (!ino || ino > sbi->s_ninodes) {
196 printk("Bad inode number on dev %s: %d is out of range\n",
198 return ERR_PTR(-EIO);
201 inode = iget_locked(sb, ino);
203 return ERR_PTR(-ENOMEM);
204 if (!(inode->i_state & I_NEW))
207 raw_inode = sysv_raw_inode(sb, ino, &bh);
209 printk("Major problem: unable to read inode from dev %s\n",
213 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
214 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
215 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
216 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
217 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
218 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
219 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
220 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
221 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
222 inode->i_ctime.tv_nsec = 0;
223 inode->i_atime.tv_nsec = 0;
224 inode->i_mtime.tv_nsec = 0;
228 for (block = 0; block < 10+1+1+1; block++)
229 read3byte(sbi, &raw_inode->i_data[3*block],
230 (u8 *)&si->i_data[block]);
232 si->i_dir_start_lookup = 0;
233 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
234 sysv_set_inode(inode,
235 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
237 sysv_set_inode(inode, 0);
238 unlock_new_inode(inode);
243 return ERR_PTR(-EIO);
246 static struct buffer_head * sysv_update_inode(struct inode * inode)
248 struct super_block * sb = inode->i_sb;
249 struct sysv_sb_info * sbi = SYSV_SB(sb);
250 struct buffer_head * bh;
251 struct sysv_inode * raw_inode;
252 struct sysv_inode_info * si;
253 unsigned int ino, block;
256 if (!ino || ino > sbi->s_ninodes) {
257 printk("Bad inode number on dev %s: %d is out of range\n",
258 inode->i_sb->s_id, ino);
261 raw_inode = sysv_raw_inode(sb, ino, &bh);
263 printk("unable to read i-node block\n");
267 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
268 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
269 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
270 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
271 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
272 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
273 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
274 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
277 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
278 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
279 for (block = 0; block < 10+1+1+1; block++)
280 write3byte(sbi, (u8 *)&si->i_data[block],
281 &raw_inode->i_data[3*block]);
282 mark_buffer_dirty(bh);
286 int sysv_write_inode(struct inode * inode, int wait)
288 struct buffer_head *bh;
290 bh = sysv_update_inode(inode);
296 int sysv_sync_inode(struct inode * inode)
299 struct buffer_head *bh;
301 bh = sysv_update_inode(inode);
302 if (bh && buffer_dirty(bh)) {
303 sync_dirty_buffer(bh);
304 if (buffer_req(bh) && !buffer_uptodate(bh)) {
305 printk ("IO error syncing sysv inode [%s:%08lx]\n",
306 inode->i_sb->s_id, inode->i_ino);
316 static void sysv_delete_inode(struct inode *inode)
318 truncate_inode_pages(&inode->i_data, 0);
320 sysv_truncate(inode);
322 sysv_free_inode(inode);
326 static struct kmem_cache *sysv_inode_cachep;
328 static struct inode *sysv_alloc_inode(struct super_block *sb)
330 struct sysv_inode_info *si;
332 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
335 return &si->vfs_inode;
338 static void sysv_destroy_inode(struct inode *inode)
340 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
343 static void init_once(void *p)
345 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
347 inode_init_once(&si->vfs_inode);
350 const struct super_operations sysv_sops = {
351 .alloc_inode = sysv_alloc_inode,
352 .destroy_inode = sysv_destroy_inode,
353 .write_inode = sysv_write_inode,
354 .delete_inode = sysv_delete_inode,
355 .put_super = sysv_put_super,
356 .write_super = sysv_write_super,
357 .remount_fs = sysv_remount,
358 .statfs = sysv_statfs,
361 int __init sysv_init_icache(void)
363 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
364 sizeof(struct sysv_inode_info), 0,
365 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
367 if (!sysv_inode_cachep)
372 void sysv_destroy_icache(void)
374 kmem_cache_destroy(sysv_inode_cachep);