1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/sysv/inode.c
6 * Copyright (C) 1991, 1992 Linus Torvalds
9 * Copyright (C) 1992 Doug Evans
12 * Copyright (C) 1993 Pascal Haible, Bruno Haible
15 * Copyright (C) 1993 Paul B. Monday
18 * Copyright (C) 1993 Bruno Haible
19 * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
21 * This file contains code for allocating/freeing inodes and for read/writing
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/writeback.h>
31 #include <linux/namei.h>
32 #include <asm/byteorder.h>
35 static int sysv_sync_fs(struct super_block *sb, int wait)
37 struct sysv_sb_info *sbi = SYSV_SB(sb);
38 u32 time = (u32)ktime_get_real_seconds(), old_time;
40 mutex_lock(&sbi->s_lock);
43 * If we are going to write out the super block,
44 * then attach current time stamp.
45 * 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, 0x7c269d38u - old_time))
50 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38u - time);
51 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
52 mark_buffer_dirty(sbi->s_bh2);
55 mutex_unlock(&sbi->s_lock);
60 static int sysv_remount(struct super_block *sb, int *flags, char *data)
62 struct sysv_sb_info *sbi = SYSV_SB(sb);
70 static void sysv_put_super(struct super_block *sb)
72 struct sysv_sb_info *sbi = SYSV_SB(sb);
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 dentry *dentry, struct kstatfs *buf)
90 struct super_block *sb = dentry->d_sb;
91 struct sysv_sb_info *sbi = SYSV_SB(sb);
92 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
94 buf->f_type = sb->s_magic;
95 buf->f_bsize = sb->s_blocksize;
96 buf->f_blocks = sbi->s_ndatazones;
97 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
98 buf->f_files = sbi->s_ninodes;
99 buf->f_ffree = sysv_count_free_inodes(sb);
100 buf->f_namelen = SYSV_NAMELEN;
101 buf->f_fsid = u64_to_fsid(id);
106 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
108 static inline void read3byte(struct sysv_sb_info *sbi,
109 unsigned char * from, unsigned char * to)
111 if (sbi->s_bytesex == BYTESEX_PDP) {
116 } else if (sbi->s_bytesex == BYTESEX_LE) {
129 static inline void write3byte(struct sysv_sb_info *sbi,
130 unsigned char * from, unsigned char * to)
132 if (sbi->s_bytesex == BYTESEX_PDP) {
136 } else if (sbi->s_bytesex == BYTESEX_LE) {
147 static const struct inode_operations sysv_symlink_inode_operations = {
148 .get_link = page_get_link,
149 .getattr = sysv_getattr,
152 void sysv_set_inode(struct inode *inode, dev_t rdev)
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 inode->i_op = &sysv_symlink_inode_operations;
164 inode_nohighmem(inode);
165 inode->i_mapping->a_ops = &sysv_aops;
167 init_special_inode(inode, inode->i_mode, rdev);
170 struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
172 struct sysv_sb_info * sbi = SYSV_SB(sb);
173 struct buffer_head * bh;
174 struct sysv_inode * raw_inode;
175 struct sysv_inode_info * si;
179 if (!ino || ino > sbi->s_ninodes) {
180 printk("Bad inode number on dev %s: %d is out of range\n",
182 return ERR_PTR(-EIO);
185 inode = iget_locked(sb, ino);
187 return ERR_PTR(-ENOMEM);
188 if (!(inode->i_state & I_NEW))
191 raw_inode = sysv_raw_inode(sb, ino, &bh);
193 printk("Major problem: unable to read inode from dev %s\n",
197 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
198 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
199 i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
200 i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
201 set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
202 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
203 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
204 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
205 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
206 inode->i_ctime.tv_nsec = 0;
207 inode->i_atime.tv_nsec = 0;
208 inode->i_mtime.tv_nsec = 0;
212 for (block = 0; block < 10+1+1+1; block++)
213 read3byte(sbi, &raw_inode->i_data[3*block],
214 (u8 *)&si->i_data[block]);
216 si->i_dir_start_lookup = 0;
217 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
218 sysv_set_inode(inode,
219 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
221 sysv_set_inode(inode, 0);
222 unlock_new_inode(inode);
227 return ERR_PTR(-EIO);
230 static int __sysv_write_inode(struct inode *inode, int wait)
232 struct super_block * sb = inode->i_sb;
233 struct sysv_sb_info * sbi = SYSV_SB(sb);
234 struct buffer_head * bh;
235 struct sysv_inode * raw_inode;
236 struct sysv_inode_info * si;
237 unsigned int ino, block;
241 if (!ino || ino > sbi->s_ninodes) {
242 printk("Bad inode number on dev %s: %d is out of range\n",
243 inode->i_sb->s_id, ino);
246 raw_inode = sysv_raw_inode(sb, ino, &bh);
248 printk("unable to read i-node block\n");
252 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
253 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode)));
254 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
255 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
256 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
257 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
258 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
259 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
262 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
263 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
264 for (block = 0; block < 10+1+1+1; block++)
265 write3byte(sbi, (u8 *)&si->i_data[block],
266 &raw_inode->i_data[3*block]);
267 mark_buffer_dirty(bh);
269 sync_dirty_buffer(bh);
270 if (buffer_req(bh) && !buffer_uptodate(bh)) {
271 printk ("IO error syncing sysv inode [%s:%08x]\n",
280 int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
282 return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
285 int sysv_sync_inode(struct inode *inode)
287 return __sysv_write_inode(inode, 1);
290 static void sysv_evict_inode(struct inode *inode)
292 truncate_inode_pages_final(&inode->i_data);
293 if (!inode->i_nlink) {
295 sysv_truncate(inode);
297 invalidate_inode_buffers(inode);
300 sysv_free_inode(inode);
303 static struct kmem_cache *sysv_inode_cachep;
305 static struct inode *sysv_alloc_inode(struct super_block *sb)
307 struct sysv_inode_info *si;
309 si = alloc_inode_sb(sb, sysv_inode_cachep, GFP_KERNEL);
312 return &si->vfs_inode;
315 static void sysv_free_in_core_inode(struct inode *inode)
317 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
320 static void init_once(void *p)
322 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
324 inode_init_once(&si->vfs_inode);
327 const struct super_operations sysv_sops = {
328 .alloc_inode = sysv_alloc_inode,
329 .free_inode = sysv_free_in_core_inode,
330 .write_inode = sysv_write_inode,
331 .evict_inode = sysv_evict_inode,
332 .put_super = sysv_put_super,
333 .sync_fs = sysv_sync_fs,
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_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
344 if (!sysv_inode_cachep)
349 void sysv_destroy_icache(void)
352 * Make sure all delayed rcu free inodes are flushed before we
356 kmem_cache_destroy(sysv_inode_cachep);