]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - fs/sysv/inode.c
Merge greybus driver tree into 4.8-rc6
[mirror_ubuntu-zesty-kernel.git] / fs / sysv / inode.c
CommitLineData
1da177e4
LT
1/*
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
1da177e4
LT
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>
a9185b41 29#include <linux/writeback.h>
21acaf8e 30#include <linux/namei.h>
1da177e4
LT
31#include <asm/byteorder.h>
32#include "sysv.h"
33
ad43ffde 34static int sysv_sync_fs(struct super_block *sb, int wait)
1da177e4
LT
35{
36 struct sysv_sb_info *sbi = SYSV_SB(sb);
37 unsigned long time = get_seconds(), old_time;
38
c07cb01c 39 mutex_lock(&sbi->s_lock);
1da177e4
LT
40
41 /*
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.
45 */
46 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
47 if (sbi->s_type == FSTYPE_SYSV4) {
48 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
49 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
50 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
51 mark_buffer_dirty(sbi->s_bh2);
52 }
ad43ffde 53
c07cb01c 54 mutex_unlock(&sbi->s_lock);
ad43ffde
CH
55
56 return 0;
57}
58
1da177e4
LT
59static int sysv_remount(struct super_block *sb, int *flags, char *data)
60{
61 struct sysv_sb_info *sbi = SYSV_SB(sb);
eee45893 62
02b9984d 63 sync_filesystem(sb);
1da177e4
LT
64 if (sbi->s_forced_ro)
65 *flags |= MS_RDONLY;
1da177e4
LT
66 return 0;
67}
68
69static void sysv_put_super(struct super_block *sb)
70{
71 struct sysv_sb_info *sbi = SYSV_SB(sb);
72
73 if (!(sb->s_flags & MS_RDONLY)) {
74 /* XXX ext2 also updates the state here */
75 mark_buffer_dirty(sbi->s_bh1);
76 if (sbi->s_bh1 != sbi->s_bh2)
77 mark_buffer_dirty(sbi->s_bh2);
78 }
79
80 brelse(sbi->s_bh1);
81 if (sbi->s_bh1 != sbi->s_bh2)
82 brelse(sbi->s_bh2);
83
84 kfree(sbi);
85}
86
726c3342 87static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 88{
726c3342 89 struct super_block *sb = dentry->d_sb;
1da177e4 90 struct sysv_sb_info *sbi = SYSV_SB(sb);
1c5b4541 91 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1da177e4
LT
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;
1c5b4541
CL
100 buf->f_fsid.val[0] = (u32)id;
101 buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4
LT
102 return 0;
103}
104
105/*
106 * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
107 */
108static inline void read3byte(struct sysv_sb_info *sbi,
109 unsigned char * from, unsigned char * to)
110{
111 if (sbi->s_bytesex == BYTESEX_PDP) {
112 to[0] = from[0];
113 to[1] = 0;
114 to[2] = from[1];
115 to[3] = from[2];
116 } else if (sbi->s_bytesex == BYTESEX_LE) {
117 to[0] = from[0];
118 to[1] = from[1];
119 to[2] = from[2];
120 to[3] = 0;
121 } else {
122 to[0] = 0;
123 to[1] = from[0];
124 to[2] = from[1];
125 to[3] = from[2];
126 }
127}
128
129static inline void write3byte(struct sysv_sb_info *sbi,
130 unsigned char * from, unsigned char * to)
131{
132 if (sbi->s_bytesex == BYTESEX_PDP) {
133 to[0] = from[0];
134 to[1] = from[2];
135 to[2] = from[3];
136 } else if (sbi->s_bytesex == BYTESEX_LE) {
137 to[0] = from[0];
138 to[1] = from[1];
139 to[2] = from[2];
140 } else {
141 to[0] = from[1];
142 to[1] = from[2];
143 to[2] = from[3];
144 }
145}
146
c5ef1c42 147static const struct inode_operations sysv_symlink_inode_operations = {
1da177e4 148 .readlink = generic_readlink,
6b255391 149 .get_link = page_get_link,
1da177e4
LT
150 .getattr = sysv_getattr,
151};
152
153void sysv_set_inode(struct inode *inode, dev_t rdev)
154{
155 if (S_ISREG(inode->i_mode)) {
156 inode->i_op = &sysv_file_inode_operations;
157 inode->i_fop = &sysv_file_operations;
158 inode->i_mapping->a_ops = &sysv_aops;
159 } else if (S_ISDIR(inode->i_mode)) {
160 inode->i_op = &sysv_dir_inode_operations;
161 inode->i_fop = &sysv_dir_operations;
162 inode->i_mapping->a_ops = &sysv_aops;
163 } else if (S_ISLNK(inode->i_mode)) {
0ebf7f10 164 inode->i_op = &sysv_symlink_inode_operations;
21fc61c7 165 inode_nohighmem(inode);
0ebf7f10 166 inode->i_mapping->a_ops = &sysv_aops;
1da177e4
LT
167 } else
168 init_special_inode(inode, inode->i_mode, rdev);
169}
170
b8e1343f 171struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
1da177e4 172{
1da177e4
LT
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;
b8e1343f
DH
177 struct inode *inode;
178 unsigned int block;
1da177e4
LT
179
180 if (!ino || ino > sbi->s_ninodes) {
181 printk("Bad inode number on dev %s: %d is out of range\n",
b8e1343f
DH
182 sb->s_id, ino);
183 return ERR_PTR(-EIO);
1da177e4 184 }
b8e1343f
DH
185
186 inode = iget_locked(sb, ino);
187 if (!inode)
188 return ERR_PTR(-ENOMEM);
189 if (!(inode->i_state & I_NEW))
190 return inode;
191
1da177e4
LT
192 raw_inode = sysv_raw_inode(sb, ino, &bh);
193 if (!raw_inode) {
194 printk("Major problem: unable to read inode from dev %s\n",
195 inode->i_sb->s_id);
196 goto bad_inode;
197 }
198 /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
199 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
a726ecce
EB
200 i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
201 i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
bfe86848 202 set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
1da177e4
LT
203 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
204 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
205 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
206 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
207 inode->i_ctime.tv_nsec = 0;
208 inode->i_atime.tv_nsec = 0;
209 inode->i_mtime.tv_nsec = 0;
ba52de12 210 inode->i_blocks = 0;
1da177e4
LT
211
212 si = SYSV_I(inode);
213 for (block = 0; block < 10+1+1+1; block++)
214 read3byte(sbi, &raw_inode->i_data[3*block],
215 (u8 *)&si->i_data[block]);
216 brelse(bh);
217 si->i_dir_start_lookup = 0;
218 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
219 sysv_set_inode(inode,
220 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
221 else
222 sysv_set_inode(inode, 0);
b8e1343f
DH
223 unlock_new_inode(inode);
224 return inode;
1da177e4
LT
225
226bad_inode:
b8e1343f
DH
227 iget_failed(inode);
228 return ERR_PTR(-EIO);
1da177e4
LT
229}
230
a9185b41 231static int __sysv_write_inode(struct inode *inode, int wait)
1da177e4
LT
232{
233 struct super_block * sb = inode->i_sb;
234 struct sysv_sb_info * sbi = SYSV_SB(sb);
235 struct buffer_head * bh;
236 struct sysv_inode * raw_inode;
237 struct sysv_inode_info * si;
238 unsigned int ino, block;
05459ca8 239 int err = 0;
1da177e4
LT
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);
05459ca8 245 return -EIO;
1da177e4
LT
246 }
247 raw_inode = sysv_raw_inode(sb, ino, &bh);
248 if (!raw_inode) {
249 printk("unable to read i-node block\n");
05459ca8 250 return -EIO;
1da177e4
LT
251 }
252
253 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
a726ecce
EB
254 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode)));
255 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
1da177e4
LT
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);
05459ca8
AV
269 if (wait) {
270 sync_dirty_buffer(bh);
271 if (buffer_req(bh) && !buffer_uptodate(bh)) {
272 printk ("IO error syncing sysv inode [%s:%08x]\n",
273 sb->s_id, ino);
274 err = -EIO;
275 }
276 }
1da177e4 277 brelse(bh);
1da177e4
LT
278 return 0;
279}
280
a9185b41
CH
281int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
282{
283 return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
284}
285
05459ca8 286int sysv_sync_inode(struct inode *inode)
1da177e4 287{
a9185b41 288 return __sysv_write_inode(inode, 1);
1da177e4
LT
289}
290
d299eadc 291static void sysv_evict_inode(struct inode *inode)
1da177e4 292{
91b0abe3 293 truncate_inode_pages_final(&inode->i_data);
d299eadc
AV
294 if (!inode->i_nlink) {
295 inode->i_size = 0;
296 sysv_truncate(inode);
297 }
298 invalidate_inode_buffers(inode);
dbd5768f 299 clear_inode(inode);
d299eadc
AV
300 if (!inode->i_nlink)
301 sysv_free_inode(inode);
1da177e4
LT
302}
303
e18b890b 304static struct kmem_cache *sysv_inode_cachep;
1da177e4
LT
305
306static struct inode *sysv_alloc_inode(struct super_block *sb)
307{
308 struct sysv_inode_info *si;
309
e94b1766 310 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
1da177e4
LT
311 if (!si)
312 return NULL;
313 return &si->vfs_inode;
314}
315
fa0d7e3d 316static void sysv_i_callback(struct rcu_head *head)
1da177e4 317{
fa0d7e3d 318 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT
319 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
320}
321
fa0d7e3d
NP
322static void sysv_destroy_inode(struct inode *inode)
323{
324 call_rcu(&inode->i_rcu, sysv_i_callback);
325}
326
51cc5068 327static void init_once(void *p)
1da177e4
LT
328{
329 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
330
a35afb83 331 inode_init_once(&si->vfs_inode);
1da177e4
LT
332}
333
ee9b6d61 334const struct super_operations sysv_sops = {
1da177e4
LT
335 .alloc_inode = sysv_alloc_inode,
336 .destroy_inode = sysv_destroy_inode,
1da177e4 337 .write_inode = sysv_write_inode,
d299eadc 338 .evict_inode = sysv_evict_inode,
1da177e4 339 .put_super = sysv_put_super,
ad43ffde 340 .sync_fs = sysv_sync_fs,
1da177e4
LT
341 .remount_fs = sysv_remount,
342 .statfs = sysv_statfs,
343};
344
345int __init sysv_init_icache(void)
346{
347 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
348 sizeof(struct sysv_inode_info), 0,
5d097056 349 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
20c2df83 350 init_once);
1da177e4
LT
351 if (!sysv_inode_cachep)
352 return -ENOMEM;
353 return 0;
354}
355
356void sysv_destroy_icache(void)
357{
8c0a8537
KS
358 /*
359 * Make sure all delayed rcu free inodes are flushed before we
360 * destroy cache.
361 */
362 rcu_barrier();
1da177e4
LT
363 kmem_cache_destroy(sysv_inode_cachep);
364}