1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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>
32#include "sysv.h"
33
34static int sysv_sync_fs(struct super_block *sb, int wait)
35{
36 struct sysv_sb_info *sbi = SYSV_SB(sb);
37 unsigned long time = get_seconds(), old_time;
38
39 lock_super(sb);
40
41
42
43
44
45
46 sb->s_dirt = 0;
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);
53 }
54
55 unlock_super(sb);
56
57 return 0;
58}
59
60static void sysv_write_super(struct super_block *sb)
61{
62 if (!(sb->s_flags & MS_RDONLY))
63 sysv_sync_fs(sb, 1);
64 else
65 sb->s_dirt = 0;
66}
67
68static int sysv_remount(struct super_block *sb, int *flags, char *data)
69{
70 struct sysv_sb_info *sbi = SYSV_SB(sb);
71 lock_super(sb);
72 if (sbi->s_forced_ro)
73 *flags |= MS_RDONLY;
74 if (*flags & MS_RDONLY)
75 sysv_write_super(sb);
76 unlock_super(sb);
77 return 0;
78}
79
80static void sysv_put_super(struct super_block *sb)
81{
82 struct sysv_sb_info *sbi = SYSV_SB(sb);
83
84 if (sb->s_dirt)
85 sysv_write_super(sb);
86
87 if (!(sb->s_flags & MS_RDONLY)) {
88
89 mark_buffer_dirty(sbi->s_bh1);
90 if (sbi->s_bh1 != sbi->s_bh2)
91 mark_buffer_dirty(sbi->s_bh2);
92 }
93
94 brelse(sbi->s_bh1);
95 if (sbi->s_bh1 != sbi->s_bh2)
96 brelse(sbi->s_bh2);
97
98 kfree(sbi);
99}
100
101static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
102{
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);
106
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);
116 return 0;
117}
118
119
120
121
122static inline void read3byte(struct sysv_sb_info *sbi,
123 unsigned char * from, unsigned char * to)
124{
125 if (sbi->s_bytesex == BYTESEX_PDP) {
126 to[0] = from[0];
127 to[1] = 0;
128 to[2] = from[1];
129 to[3] = from[2];
130 } else if (sbi->s_bytesex == BYTESEX_LE) {
131 to[0] = from[0];
132 to[1] = from[1];
133 to[2] = from[2];
134 to[3] = 0;
135 } else {
136 to[0] = 0;
137 to[1] = from[0];
138 to[2] = from[1];
139 to[3] = from[2];
140 }
141}
142
143static inline void write3byte(struct sysv_sb_info *sbi,
144 unsigned char * from, unsigned char * to)
145{
146 if (sbi->s_bytesex == BYTESEX_PDP) {
147 to[0] = from[0];
148 to[1] = from[2];
149 to[2] = from[3];
150 } else if (sbi->s_bytesex == BYTESEX_LE) {
151 to[0] = from[0];
152 to[1] = from[1];
153 to[2] = from[2];
154 } else {
155 to[0] = from[1];
156 to[1] = from[2];
157 to[2] = from[3];
158 }
159}
160
161static 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,
166};
167
168void sysv_set_inode(struct inode *inode, dev_t rdev)
169{
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 if (inode->i_blocks) {
180 inode->i_op = &sysv_symlink_inode_operations;
181 inode->i_mapping->a_ops = &sysv_aops;
182 } else {
183 inode->i_op = &sysv_fast_symlink_inode_operations;
184 nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
185 sizeof(SYSV_I(inode)->i_data) - 1);
186 }
187 } else
188 init_special_inode(inode, inode->i_mode, rdev);
189}
190
191struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
192{
193 struct sysv_sb_info * sbi = SYSV_SB(sb);
194 struct buffer_head * bh;
195 struct sysv_inode * raw_inode;
196 struct sysv_inode_info * si;
197 struct inode *inode;
198 unsigned int block;
199
200 if (!ino || ino > sbi->s_ninodes) {
201 printk("Bad inode number on dev %s: %d is out of range\n",
202 sb->s_id, ino);
203 return ERR_PTR(-EIO);
204 }
205
206 inode = iget_locked(sb, ino);
207 if (!inode)
208 return ERR_PTR(-ENOMEM);
209 if (!(inode->i_state & I_NEW))
210 return inode;
211
212 raw_inode = sysv_raw_inode(sb, ino, &bh);
213 if (!raw_inode) {
214 printk("Major problem: unable to read inode from dev %s\n",
215 inode->i_sb->s_id);
216 goto bad_inode;
217 }
218
219 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
220 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
221 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
222 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
223 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
224 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
225 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
226 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
227 inode->i_ctime.tv_nsec = 0;
228 inode->i_atime.tv_nsec = 0;
229 inode->i_mtime.tv_nsec = 0;
230 inode->i_blocks = 0;
231
232 si = SYSV_I(inode);
233 for (block = 0; block < 10+1+1+1; block++)
234 read3byte(sbi, &raw_inode->i_data[3*block],
235 (u8 *)&si->i_data[block]);
236 brelse(bh);
237 si->i_dir_start_lookup = 0;
238 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
239 sysv_set_inode(inode,
240 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
241 else
242 sysv_set_inode(inode, 0);
243 unlock_new_inode(inode);
244 return inode;
245
246bad_inode:
247 iget_failed(inode);
248 return ERR_PTR(-EIO);
249}
250
251static int __sysv_write_inode(struct inode *inode, int wait)
252{
253 struct super_block * sb = inode->i_sb;
254 struct sysv_sb_info * sbi = SYSV_SB(sb);
255 struct buffer_head * bh;
256 struct sysv_inode * raw_inode;
257 struct sysv_inode_info * si;
258 unsigned int ino, block;
259 int err = 0;
260
261 ino = inode->i_ino;
262 if (!ino || ino > sbi->s_ninodes) {
263 printk("Bad inode number on dev %s: %d is out of range\n",
264 inode->i_sb->s_id, ino);
265 return -EIO;
266 }
267 raw_inode = sysv_raw_inode(sb, ino, &bh);
268 if (!raw_inode) {
269 printk("unable to read i-node block\n");
270 return -EIO;
271 }
272
273 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
274 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
275 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
276 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
277 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
278 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
279 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
280 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
281
282 si = SYSV_I(inode);
283 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
284 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
285 for (block = 0; block < 10+1+1+1; block++)
286 write3byte(sbi, (u8 *)&si->i_data[block],
287 &raw_inode->i_data[3*block]);
288 mark_buffer_dirty(bh);
289 if (wait) {
290 sync_dirty_buffer(bh);
291 if (buffer_req(bh) && !buffer_uptodate(bh)) {
292 printk ("IO error syncing sysv inode [%s:%08x]\n",
293 sb->s_id, ino);
294 err = -EIO;
295 }
296 }
297 brelse(bh);
298 return 0;
299}
300
301int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
302{
303 return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
304}
305
306int sysv_sync_inode(struct inode *inode)
307{
308 return __sysv_write_inode(inode, 1);
309}
310
311static void sysv_evict_inode(struct inode *inode)
312{
313 truncate_inode_pages(&inode->i_data, 0);
314 if (!inode->i_nlink) {
315 inode->i_size = 0;
316 sysv_truncate(inode);
317 }
318 invalidate_inode_buffers(inode);
319 end_writeback(inode);
320 if (!inode->i_nlink)
321 sysv_free_inode(inode);
322}
323
324static struct kmem_cache *sysv_inode_cachep;
325
326static struct inode *sysv_alloc_inode(struct super_block *sb)
327{
328 struct sysv_inode_info *si;
329
330 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
331 if (!si)
332 return NULL;
333 return &si->vfs_inode;
334}
335
336static void sysv_i_callback(struct rcu_head *head)
337{
338 struct inode *inode = container_of(head, struct inode, i_rcu);
339 INIT_LIST_HEAD(&inode->i_dentry);
340 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
341}
342
343static void sysv_destroy_inode(struct inode *inode)
344{
345 call_rcu(&inode->i_rcu, sysv_i_callback);
346}
347
348static void init_once(void *p)
349{
350 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
351
352 inode_init_once(&si->vfs_inode);
353}
354
355const struct super_operations sysv_sops = {
356 .alloc_inode = sysv_alloc_inode,
357 .destroy_inode = sysv_destroy_inode,
358 .write_inode = sysv_write_inode,
359 .evict_inode = sysv_evict_inode,
360 .put_super = sysv_put_super,
361 .write_super = sysv_write_super,
362 .sync_fs = sysv_sync_fs,
363 .remount_fs = sysv_remount,
364 .statfs = sysv_statfs,
365};
366
367int __init sysv_init_icache(void)
368{
369 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
370 sizeof(struct sysv_inode_info), 0,
371 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
372 init_once);
373 if (!sysv_inode_cachep)
374 return -ENOMEM;
375 return 0;
376}
377
378void sysv_destroy_icache(void)
379{
380 kmem_cache_destroy(sysv_inode_cachep);
381}
382
