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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/namei.h>
30#include <asm/byteorder.h>
31#include "sysv.h"
32
33static int sysv_sync_fs(struct super_block *sb, int wait)
34{
35 struct sysv_sb_info *sbi = SYSV_SB(sb);
36 unsigned long time = get_seconds(), old_time;
37
38 lock_super(sb);
39
40
41
42
43
44
45 old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
46 if (sbi->s_type == FSTYPE_SYSV4) {
47 if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
48 *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time);
49 *sbi->s_sb_time = cpu_to_fs32(sbi, time);
50 mark_buffer_dirty(sbi->s_bh2);
51 }
52
53 unlock_super(sb);
54
55 return 0;
56}
57
58static void sysv_write_super(struct super_block *sb)
59{
60 if (!(sb->s_flags & MS_RDONLY))
61 sysv_sync_fs(sb, 1);
62 else
63 sb->s_dirt = 0;
64}
65
66static int sysv_remount(struct super_block *sb, int *flags, char *data)
67{
68 struct sysv_sb_info *sbi = SYSV_SB(sb);
69 lock_super(sb);
70 if (sbi->s_forced_ro)
71 *flags |= MS_RDONLY;
72 if (!(*flags & MS_RDONLY))
73 sb->s_dirt = 1;
74 unlock_super(sb);
75 return 0;
76}
77
78static void sysv_put_super(struct super_block *sb)
79{
80 struct sysv_sb_info *sbi = SYSV_SB(sb);
81
82 if (sb->s_dirt)
83 sysv_write_super(sb);
84
85 if (!(sb->s_flags & MS_RDONLY)) {
86
87 mark_buffer_dirty(sbi->s_bh1);
88 if (sbi->s_bh1 != sbi->s_bh2)
89 mark_buffer_dirty(sbi->s_bh2);
90 }
91
92 brelse(sbi->s_bh1);
93 if (sbi->s_bh1 != sbi->s_bh2)
94 brelse(sbi->s_bh2);
95
96 kfree(sbi);
97}
98
99static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
100{
101 struct super_block *sb = dentry->d_sb;
102 struct sysv_sb_info *sbi = SYSV_SB(sb);
103 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
104
105 buf->f_type = sb->s_magic;
106 buf->f_bsize = sb->s_blocksize;
107 buf->f_blocks = sbi->s_ndatazones;
108 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
109 buf->f_files = sbi->s_ninodes;
110 buf->f_ffree = sysv_count_free_inodes(sb);
111 buf->f_namelen = SYSV_NAMELEN;
112 buf->f_fsid.val[0] = (u32)id;
113 buf->f_fsid.val[1] = (u32)(id >> 32);
114 return 0;
115}
116
117
118
119
120static inline void read3byte(struct sysv_sb_info *sbi,
121 unsigned char * from, unsigned char * to)
122{
123 if (sbi->s_bytesex == BYTESEX_PDP) {
124 to[0] = from[0];
125 to[1] = 0;
126 to[2] = from[1];
127 to[3] = from[2];
128 } else if (sbi->s_bytesex == BYTESEX_LE) {
129 to[0] = from[0];
130 to[1] = from[1];
131 to[2] = from[2];
132 to[3] = 0;
133 } else {
134 to[0] = 0;
135 to[1] = from[0];
136 to[2] = from[1];
137 to[3] = from[2];
138 }
139}
140
141static inline void write3byte(struct sysv_sb_info *sbi,
142 unsigned char * from, unsigned char * to)
143{
144 if (sbi->s_bytesex == BYTESEX_PDP) {
145 to[0] = from[0];
146 to[1] = from[2];
147 to[2] = from[3];
148 } else if (sbi->s_bytesex == BYTESEX_LE) {
149 to[0] = from[0];
150 to[1] = from[1];
151 to[2] = from[2];
152 } else {
153 to[0] = from[1];
154 to[1] = from[2];
155 to[2] = from[3];
156 }
157}
158
159static const struct inode_operations sysv_symlink_inode_operations = {
160 .readlink = generic_readlink,
161 .follow_link = page_follow_link_light,
162 .put_link = page_put_link,
163 .getattr = sysv_getattr,
164};
165
166void sysv_set_inode(struct inode *inode, dev_t rdev)
167{
168 if (S_ISREG(inode->i_mode)) {
169 inode->i_op = &sysv_file_inode_operations;
170 inode->i_fop = &sysv_file_operations;
171 inode->i_mapping->a_ops = &sysv_aops;
172 } else if (S_ISDIR(inode->i_mode)) {
173 inode->i_op = &sysv_dir_inode_operations;
174 inode->i_fop = &sysv_dir_operations;
175 inode->i_mapping->a_ops = &sysv_aops;
176 } else if (S_ISLNK(inode->i_mode)) {
177 if (inode->i_blocks) {
178 inode->i_op = &sysv_symlink_inode_operations;
179 inode->i_mapping->a_ops = &sysv_aops;
180 } else {
181 inode->i_op = &sysv_fast_symlink_inode_operations;
182 nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
183 sizeof(SYSV_I(inode)->i_data) - 1);
184 }
185 } else
186 init_special_inode(inode, inode->i_mode, rdev);
187}
188
189struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
190{
191 struct sysv_sb_info * sbi = SYSV_SB(sb);
192 struct buffer_head * bh;
193 struct sysv_inode * raw_inode;
194 struct sysv_inode_info * si;
195 struct inode *inode;
196 unsigned int block;
197
198 if (!ino || ino > sbi->s_ninodes) {
199 printk("Bad inode number on dev %s: %d is out of range\n",
200 sb->s_id, ino);
201 return ERR_PTR(-EIO);
202 }
203
204 inode = iget_locked(sb, ino);
205 if (!inode)
206 return ERR_PTR(-ENOMEM);
207 if (!(inode->i_state & I_NEW))
208 return inode;
209
210 raw_inode = sysv_raw_inode(sb, ino, &bh);
211 if (!raw_inode) {
212 printk("Major problem: unable to read inode from dev %s\n",
213 inode->i_sb->s_id);
214 goto bad_inode;
215 }
216
217 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
218 inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid);
219 inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid);
220 inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink);
221 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
222 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
223 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
224 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
225 inode->i_ctime.tv_nsec = 0;
226 inode->i_atime.tv_nsec = 0;
227 inode->i_mtime.tv_nsec = 0;
228 inode->i_blocks = 0;
229
230 si = SYSV_I(inode);
231 for (block = 0; block < 10+1+1+1; block++)
232 read3byte(sbi, &raw_inode->i_data[3*block],
233 (u8 *)&si->i_data[block]);
234 brelse(bh);
235 si->i_dir_start_lookup = 0;
236 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
237 sysv_set_inode(inode,
238 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
239 else
240 sysv_set_inode(inode, 0);
241 unlock_new_inode(inode);
242 return inode;
243
244bad_inode:
245 iget_failed(inode);
246 return ERR_PTR(-EIO);
247}
248
249int sysv_write_inode(struct inode *inode, int wait)
250{
251 struct super_block * sb = inode->i_sb;
252 struct sysv_sb_info * sbi = SYSV_SB(sb);
253 struct buffer_head * bh;
254 struct sysv_inode * raw_inode;
255 struct sysv_inode_info * si;
256 unsigned int ino, block;
257 int err = 0;
258
259 ino = inode->i_ino;
260 if (!ino || ino > sbi->s_ninodes) {
261 printk("Bad inode number on dev %s: %d is out of range\n",
262 inode->i_sb->s_id, ino);
263 return -EIO;
264 }
265 raw_inode = sysv_raw_inode(sb, ino, &bh);
266 if (!raw_inode) {
267 printk("unable to read i-node block\n");
268 return -EIO;
269 }
270
271 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
272 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid));
273 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid));
274 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
275 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
276 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
277 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
278 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
279
280 si = SYSV_I(inode);
281 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
282 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
283 for (block = 0; block < 10+1+1+1; block++)
284 write3byte(sbi, (u8 *)&si->i_data[block],
285 &raw_inode->i_data[3*block]);
286 mark_buffer_dirty(bh);
287 if (wait) {
288 sync_dirty_buffer(bh);
289 if (buffer_req(bh) && !buffer_uptodate(bh)) {
290 printk ("IO error syncing sysv inode [%s:%08x]\n",
291 sb->s_id, ino);
292 err = -EIO;
293 }
294 }
295 brelse(bh);
296 return 0;
297}
298
299int sysv_sync_inode(struct inode *inode)
300{
301 return sysv_write_inode(inode, 1);
302}
303
304static void sysv_delete_inode(struct inode *inode)
305{
306 truncate_inode_pages(&inode->i_data, 0);
307 inode->i_size = 0;
308 sysv_truncate(inode);
309 sysv_free_inode(inode);
310}
311
312static struct kmem_cache *sysv_inode_cachep;
313
314static struct inode *sysv_alloc_inode(struct super_block *sb)
315{
316 struct sysv_inode_info *si;
317
318 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
319 if (!si)
320 return NULL;
321 return &si->vfs_inode;
322}
323
324static void sysv_destroy_inode(struct inode *inode)
325{
326 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
327}
328
329static void init_once(void *p)
330{
331 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
332
333 inode_init_once(&si->vfs_inode);
334}
335
336const struct super_operations sysv_sops = {
337 .alloc_inode = sysv_alloc_inode,
338 .destroy_inode = sysv_destroy_inode,
339 .write_inode = sysv_write_inode,
340 .delete_inode = sysv_delete_inode,
341 .put_super = sysv_put_super,
342 .write_super = sysv_write_super,
343 .sync_fs = sysv_sync_fs,
344 .remount_fs = sysv_remount,
345 .statfs = sysv_statfs,
346};
347
348int __init sysv_init_icache(void)
349{
350 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
351 sizeof(struct sysv_inode_info), 0,
352 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
353 init_once);
354 if (!sysv_inode_cachep)
355 return -ENOMEM;
356 return 0;
357}
358
359void sysv_destroy_icache(void)
360{
361 kmem_cache_destroy(sysv_inode_cachep);
362}
363
