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/highuid.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/buffer_head.h>
28 #include <linux/vfs.h>
29 #include <linux/writeback.h>
30 #include <linux/namei.h>
31 #include <asm/byteorder.h>
34 static int sysv_sync_fs(struct super_block *sb, int wait)
36 struct sysv_sb_info *sbi = SYSV_SB(sb);
37 unsigned long time = get_seconds(), old_time;
42 * If we are going to write out the super block,
43 * then attach current time stamp.
44 * But if the filesystem was marked clean, keep it clean.
47 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
48 if (sbi->s_type == FSTYPE_SYSV4) {
49 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
50 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
51 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
52 mark_buffer_dirty(sbi->s_bh2);
60 static void sysv_write_super(struct super_block *sb)
62 if (!(sb->s_flags & MS_RDONLY))
68 static int sysv_remount(struct super_block *sb, int *flags, char *data)
70 struct sysv_sb_info *sbi = SYSV_SB(sb);
74 if (*flags & MS_RDONLY)
80 static void sysv_put_super(struct super_block *sb)
82 struct sysv_sb_info *sbi = SYSV_SB(sb);
87 if (!(sb->s_flags & MS_RDONLY)) {
88 /* XXX ext2 also updates the state here */
89 mark_buffer_dirty(sbi->s_bh1);
90 if (sbi->s_bh1 != sbi->s_bh2)
91 mark_buffer_dirty(sbi->s_bh2);
95 if (sbi->s_bh1 != sbi->s_bh2)
101 static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
103 struct super_block *sb = dentry->d_sb;
104 struct sysv_sb_info *sbi = SYSV_SB(sb);
105 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
107 buf->f_type = sb->s_magic;
108 buf->f_bsize = sb->s_blocksize;
109 buf->f_blocks = sbi->s_ndatazones;
110 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
111 buf->f_files = sbi->s_ninodes;
112 buf->f_ffree = sysv_count_free_inodes(sb);
113 buf->f_namelen = SYSV_NAMELEN;
114 buf->f_fsid.val[0] = (u32)id;
115 buf->f_fsid.val[1] = (u32)(id >> 32);
120 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
122 static inline void read3byte(struct sysv_sb_info *sbi,
123 unsigned char * from, unsigned char * to)
125 if (sbi->s_bytesex == BYTESEX_PDP) {
130 } else if (sbi->s_bytesex == BYTESEX_LE) {
143 static inline void write3byte(struct sysv_sb_info *sbi,
144 unsigned char * from, unsigned char * to)
146 if (sbi->s_bytesex == BYTESEX_PDP) {
150 } else if (sbi->s_bytesex == BYTESEX_LE) {
161 static const struct inode_operations sysv_symlink_inode_operations = {
162 .readlink = generic_readlink,
163 .follow_link = page_follow_link_light,
164 .put_link = page_put_link,
165 .getattr = sysv_getattr,
168 void sysv_set_inode(struct inode *inode, dev_t rdev)
170 if (S_ISREG(inode->i_mode)) {
171 inode->i_op = &sysv_file_inode_operations;
172 inode->i_fop = &sysv_file_operations;
173 inode->i_mapping->a_ops = &sysv_aops;
174 } else if (S_ISDIR(inode->i_mode)) {
175 inode->i_op = &sysv_dir_inode_operations;
176 inode->i_fop = &sysv_dir_operations;
177 inode->i_mapping->a_ops = &sysv_aops;
178 } else if (S_ISLNK(inode->i_mode)) {
179 inode->i_op = &sysv_symlink_inode_operations;
180 inode->i_mapping->a_ops = &sysv_aops;
182 init_special_inode(inode, inode->i_mode, rdev);
185 struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
187 struct sysv_sb_info * sbi = SYSV_SB(sb);
188 struct buffer_head * bh;
189 struct sysv_inode * raw_inode;
190 struct sysv_inode_info * si;
194 if (!ino || ino > sbi->s_ninodes) {
195 printk("Bad inode number on dev %s: %d is out of range\n",
197 return ERR_PTR(-EIO);
200 inode = iget_locked(sb, ino);
202 return ERR_PTR(-ENOMEM);
203 if (!(inode->i_state & I_NEW))
206 raw_inode = sysv_raw_inode(sb, ino, &bh);
208 printk("Major problem: unable to read inode from dev %s\n",
212 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
213 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
214 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
215 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
216 set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
217 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
218 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
219 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
220 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
221 inode->i_ctime.tv_nsec = 0;
222 inode->i_atime.tv_nsec = 0;
223 inode->i_mtime.tv_nsec = 0;
227 for (block = 0; block < 10+1+1+1; block++)
228 read3byte(sbi, &raw_inode->i_data[3*block],
229 (u8 *)&si->i_data[block]);
231 si->i_dir_start_lookup = 0;
232 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
233 sysv_set_inode(inode,
234 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
236 sysv_set_inode(inode, 0);
237 unlock_new_inode(inode);
242 return ERR_PTR(-EIO);
245 static int __sysv_write_inode(struct inode *inode, int wait)
247 struct super_block * sb = inode->i_sb;
248 struct sysv_sb_info * sbi = SYSV_SB(sb);
249 struct buffer_head * bh;
250 struct sysv_inode * raw_inode;
251 struct sysv_inode_info * si;
252 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);
284 sync_dirty_buffer(bh);
285 if (buffer_req(bh) && !buffer_uptodate(bh)) {
286 printk ("IO error syncing sysv inode [%s:%08x]\n",
295 int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
297 return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
300 int sysv_sync_inode(struct inode *inode)
302 return __sysv_write_inode(inode, 1);
305 static void sysv_evict_inode(struct inode *inode)
307 truncate_inode_pages(&inode->i_data, 0);
308 if (!inode->i_nlink) {
310 sysv_truncate(inode);
312 invalidate_inode_buffers(inode);
313 end_writeback(inode);
315 sysv_free_inode(inode);
318 static struct kmem_cache *sysv_inode_cachep;
320 static struct inode *sysv_alloc_inode(struct super_block *sb)
322 struct sysv_inode_info *si;
324 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
327 return &si->vfs_inode;
330 static void sysv_i_callback(struct rcu_head *head)
332 struct inode *inode = container_of(head, struct inode, i_rcu);
333 INIT_LIST_HEAD(&inode->i_dentry);
334 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
337 static void sysv_destroy_inode(struct inode *inode)
339 call_rcu(&inode->i_rcu, sysv_i_callback);
342 static void init_once(void *p)
344 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
346 inode_init_once(&si->vfs_inode);
349 const struct super_operations sysv_sops = {
350 .alloc_inode = sysv_alloc_inode,
351 .destroy_inode = sysv_destroy_inode,
352 .write_inode = sysv_write_inode,
353 .evict_inode = sysv_evict_inode,
354 .put_super = sysv_put_super,
355 .write_super = sysv_write_super,
356 .sync_fs = sysv_sync_fs,
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);