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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/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 mutex_lock(&sbi->s_lock);
40
41
42
43
44
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 }
53
54 mutex_unlock(&sbi->s_lock);
55
56 return 0;
57}
58
59static int sysv_remount(struct super_block *sb, int *flags, char *data)
60{
61 struct sysv_sb_info *sbi = SYSV_SB(sb);
62
63 if (sbi->s_forced_ro)
64 *flags |= MS_RDONLY;
65 return 0;
66}
67
68static void sysv_put_super(struct super_block *sb)
69{
70 struct sysv_sb_info *sbi = SYSV_SB(sb);
71
72 if (!(sb->s_flags & MS_RDONLY)) {
73
74 mark_buffer_dirty(sbi->s_bh1);
75 if (sbi->s_bh1 != sbi->s_bh2)
76 mark_buffer_dirty(sbi->s_bh2);
77 }
78
79 brelse(sbi->s_bh1);
80 if (sbi->s_bh1 != sbi->s_bh2)
81 brelse(sbi->s_bh2);
82
83 kfree(sbi);
84}
85
86static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
87{
88 struct super_block *sb = dentry->d_sb;
89 struct sysv_sb_info *sbi = SYSV_SB(sb);
90 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
91
92 buf->f_type = sb->s_magic;
93 buf->f_bsize = sb->s_blocksize;
94 buf->f_blocks = sbi->s_ndatazones;
95 buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
96 buf->f_files = sbi->s_ninodes;
97 buf->f_ffree = sysv_count_free_inodes(sb);
98 buf->f_namelen = SYSV_NAMELEN;
99 buf->f_fsid.val[0] = (u32)id;
100 buf->f_fsid.val[1] = (u32)(id >> 32);
101 return 0;
102}
103
104
105
106
107static inline void read3byte(struct sysv_sb_info *sbi,
108 unsigned char * from, unsigned char * to)
109{
110 if (sbi->s_bytesex == BYTESEX_PDP) {
111 to[0] = from[0];
112 to[1] = 0;
113 to[2] = from[1];
114 to[3] = from[2];
115 } else if (sbi->s_bytesex == BYTESEX_LE) {
116 to[0] = from[0];
117 to[1] = from[1];
118 to[2] = from[2];
119 to[3] = 0;
120 } else {
121 to[0] = 0;
122 to[1] = from[0];
123 to[2] = from[1];
124 to[3] = from[2];
125 }
126}
127
128static inline void write3byte(struct sysv_sb_info *sbi,
129 unsigned char * from, unsigned char * to)
130{
131 if (sbi->s_bytesex == BYTESEX_PDP) {
132 to[0] = from[0];
133 to[1] = from[2];
134 to[2] = from[3];
135 } else if (sbi->s_bytesex == BYTESEX_LE) {
136 to[0] = from[0];
137 to[1] = from[1];
138 to[2] = from[2];
139 } else {
140 to[0] = from[1];
141 to[1] = from[2];
142 to[2] = from[3];
143 }
144}
145
146static const struct inode_operations sysv_symlink_inode_operations = {
147 .readlink = generic_readlink,
148 .follow_link = page_follow_link_light,
149 .put_link = page_put_link,
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)) {
164 if (inode->i_blocks) {
165 inode->i_op = &sysv_symlink_inode_operations;
166 inode->i_mapping->a_ops = &sysv_aops;
167 } else {
168 inode->i_op = &sysv_fast_symlink_inode_operations;
169 nd_terminate_link(SYSV_I(inode)->i_data, inode->i_size,
170 sizeof(SYSV_I(inode)->i_data) - 1);
171 }
172 } else
173 init_special_inode(inode, inode->i_mode, rdev);
174}
175
176struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
177{
178 struct sysv_sb_info * sbi = SYSV_SB(sb);
179 struct buffer_head * bh;
180 struct sysv_inode * raw_inode;
181 struct sysv_inode_info * si;
182 struct inode *inode;
183 unsigned int block;
184
185 if (!ino || ino > sbi->s_ninodes) {
186 printk("Bad inode number on dev %s: %d is out of range\n",
187 sb->s_id, ino);
188 return ERR_PTR(-EIO);
189 }
190
191 inode = iget_locked(sb, ino);
192 if (!inode)
193 return ERR_PTR(-ENOMEM);
194 if (!(inode->i_state & I_NEW))
195 return inode;
196
197 raw_inode = sysv_raw_inode(sb, ino, &bh);
198 if (!raw_inode) {
199 printk("Major problem: unable to read inode from dev %s\n",
200 inode->i_sb->s_id);
201 goto bad_inode;
202 }
203
204 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
205 i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
206 i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
207 set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
208 inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
209 inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime);
210 inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime);
211 inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime);
212 inode->i_ctime.tv_nsec = 0;
213 inode->i_atime.tv_nsec = 0;
214 inode->i_mtime.tv_nsec = 0;
215 inode->i_blocks = 0;
216
217 si = SYSV_I(inode);
218 for (block = 0; block < 10+1+1+1; block++)
219 read3byte(sbi, &raw_inode->i_data[3*block],
220 (u8 *)&si->i_data[block]);
221 brelse(bh);
222 si->i_dir_start_lookup = 0;
223 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
224 sysv_set_inode(inode,
225 old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
226 else
227 sysv_set_inode(inode, 0);
228 unlock_new_inode(inode);
229 return inode;
230
231bad_inode:
232 iget_failed(inode);
233 return ERR_PTR(-EIO);
234}
235
236static int __sysv_write_inode(struct inode *inode, int wait)
237{
238 struct super_block * sb = inode->i_sb;
239 struct sysv_sb_info * sbi = SYSV_SB(sb);
240 struct buffer_head * bh;
241 struct sysv_inode * raw_inode;
242 struct sysv_inode_info * si;
243 unsigned int ino, block;
244 int err = 0;
245
246 ino = inode->i_ino;
247 if (!ino || ino > sbi->s_ninodes) {
248 printk("Bad inode number on dev %s: %d is out of range\n",
249 inode->i_sb->s_id, ino);
250 return -EIO;
251 }
252 raw_inode = sysv_raw_inode(sb, ino, &bh);
253 if (!raw_inode) {
254 printk("unable to read i-node block\n");
255 return -EIO;
256 }
257
258 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
259 raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode)));
260 raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
261 raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
262 raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
263 raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec);
264 raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec);
265 raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec);
266
267 si = SYSV_I(inode);
268 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
269 si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
270 for (block = 0; block < 10+1+1+1; block++)
271 write3byte(sbi, (u8 *)&si->i_data[block],
272 &raw_inode->i_data[3*block]);
273 mark_buffer_dirty(bh);
274 if (wait) {
275 sync_dirty_buffer(bh);
276 if (buffer_req(bh) && !buffer_uptodate(bh)) {
277 printk ("IO error syncing sysv inode [%s:%08x]\n",
278 sb->s_id, ino);
279 err = -EIO;
280 }
281 }
282 brelse(bh);
283 return 0;
284}
285
286int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
287{
288 return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
289}
290
291int sysv_sync_inode(struct inode *inode)
292{
293 return __sysv_write_inode(inode, 1);
294}
295
296static void sysv_evict_inode(struct inode *inode)
297{
298 truncate_inode_pages(&inode->i_data, 0);
299 if (!inode->i_nlink) {
300 inode->i_size = 0;
301 sysv_truncate(inode);
302 }
303 invalidate_inode_buffers(inode);
304 clear_inode(inode);
305 if (!inode->i_nlink)
306 sysv_free_inode(inode);
307}
308
309static struct kmem_cache *sysv_inode_cachep;
310
311static struct inode *sysv_alloc_inode(struct super_block *sb)
312{
313 struct sysv_inode_info *si;
314
315 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
316 if (!si)
317 return NULL;
318 return &si->vfs_inode;
319}
320
321static void sysv_i_callback(struct rcu_head *head)
322{
323 struct inode *inode = container_of(head, struct inode, i_rcu);
324 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
325}
326
327static void sysv_destroy_inode(struct inode *inode)
328{
329 call_rcu(&inode->i_rcu, sysv_i_callback);
330}
331
332static void init_once(void *p)
333{
334 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
335
336 inode_init_once(&si->vfs_inode);
337}
338
339const struct super_operations sysv_sops = {
340 .alloc_inode = sysv_alloc_inode,
341 .destroy_inode = sysv_destroy_inode,
342 .write_inode = sysv_write_inode,
343 .evict_inode = sysv_evict_inode,
344 .put_super = sysv_put_super,
345 .sync_fs = sysv_sync_fs,
346 .remount_fs = sysv_remount,
347 .statfs = sysv_statfs,
348};
349
350int __init sysv_init_icache(void)
351{
352 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
353 sizeof(struct sysv_inode_info), 0,
354 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
355 init_once);
356 if (!sysv_inode_cachep)
357 return -ENOMEM;
358 return 0;
359}
360
361void sysv_destroy_icache(void)
362{
363
364
365
366
367 rcu_barrier();
368 kmem_cache_destroy(sysv_inode_cachep);
369}
370
