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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>
33#include "sysv.h"
34
35static int sysv_sync_fs(struct super_block *sb, int wait)
36{
37 struct sysv_sb_info *sbi = SYSV_SB(sb);
38 u32 time = (u32)ktime_get_real_seconds(), old_time;
39
40 mutex_lock(&sbi->s_lock);
41
42
43
44
45
46
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);
53 }
54
55 mutex_unlock(&sbi->s_lock);
56
57 return 0;
58}
59
60static int sysv_remount(struct super_block *sb, int *flags, char *data)
61{
62 struct sysv_sb_info *sbi = SYSV_SB(sb);
63
64 sync_filesystem(sb);
65 if (sbi->s_forced_ro)
66 *flags |= SB_RDONLY;
67 return 0;
68}
69
70static void sysv_put_super(struct super_block *sb)
71{
72 struct sysv_sb_info *sbi = SYSV_SB(sb);
73
74 if (!sb_rdonly(sb)) {
75
76 mark_buffer_dirty(sbi->s_bh1);
77 if (sbi->s_bh1 != sbi->s_bh2)
78 mark_buffer_dirty(sbi->s_bh2);
79 }
80
81 brelse(sbi->s_bh1);
82 if (sbi->s_bh1 != sbi->s_bh2)
83 brelse(sbi->s_bh2);
84
85 kfree(sbi);
86}
87
88static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
89{
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);
93
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.val[0] = (u32)id;
102 buf->f_fsid.val[1] = (u32)(id >> 32);
103 return 0;
104}
105
106
107
108
109static inline void read3byte(struct sysv_sb_info *sbi,
110 unsigned char * from, unsigned char * to)
111{
112 if (sbi->s_bytesex == BYTESEX_PDP) {
113 to[0] = from[0];
114 to[1] = 0;
115 to[2] = from[1];
116 to[3] = from[2];
117 } else if (sbi->s_bytesex == BYTESEX_LE) {
118 to[0] = from[0];
119 to[1] = from[1];
120 to[2] = from[2];
121 to[3] = 0;
122 } else {
123 to[0] = 0;
124 to[1] = from[0];
125 to[2] = from[1];
126 to[3] = from[2];
127 }
128}
129
130static inline void write3byte(struct sysv_sb_info *sbi,
131 unsigned char * from, unsigned char * to)
132{
133 if (sbi->s_bytesex == BYTESEX_PDP) {
134 to[0] = from[0];
135 to[1] = from[2];
136 to[2] = from[3];
137 } else if (sbi->s_bytesex == BYTESEX_LE) {
138 to[0] = from[0];
139 to[1] = from[1];
140 to[2] = from[2];
141 } else {
142 to[0] = from[1];
143 to[1] = from[2];
144 to[2] = from[3];
145 }
146}
147
148static const struct inode_operations sysv_symlink_inode_operations = {
149 .get_link = page_get_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 inode->i_op = &sysv_symlink_inode_operations;
165 inode_nohighmem(inode);
166 inode->i_mapping->a_ops = &sysv_aops;
167 } else
168 init_special_inode(inode, inode->i_mode, rdev);
169}
170
171struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
172{
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;
177 struct inode *inode;
178 unsigned int block;
179
180 if (!ino || ino > sbi->s_ninodes) {
181 printk("Bad inode number on dev %s: %d is out of range\n",
182 sb->s_id, ino);
183 return ERR_PTR(-EIO);
184 }
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
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
199 inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
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));
202 set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
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;
210 inode->i_blocks = 0;
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);
223 unlock_new_inode(inode);
224 return inode;
225
226bad_inode:
227 iget_failed(inode);
228 return ERR_PTR(-EIO);
229}
230
231static int __sysv_write_inode(struct inode *inode, int wait)
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;
239 int err = 0;
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);
245 return -EIO;
246 }
247 raw_inode = sysv_raw_inode(sb, ino, &bh);
248 if (!raw_inode) {
249 printk("unable to read i-node block\n");
250 return -EIO;
251 }
252
253 raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
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)));
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);
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 }
277 brelse(bh);
278 return err;
279}
280
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
286int sysv_sync_inode(struct inode *inode)
287{
288 return __sysv_write_inode(inode, 1);
289}
290
291static void sysv_evict_inode(struct inode *inode)
292{
293 truncate_inode_pages_final(&inode->i_data);
294 if (!inode->i_nlink) {
295 inode->i_size = 0;
296 sysv_truncate(inode);
297 }
298 invalidate_inode_buffers(inode);
299 clear_inode(inode);
300 if (!inode->i_nlink)
301 sysv_free_inode(inode);
302}
303
304static struct kmem_cache *sysv_inode_cachep;
305
306static struct inode *sysv_alloc_inode(struct super_block *sb)
307{
308 struct sysv_inode_info *si;
309
310 si = kmem_cache_alloc(sysv_inode_cachep, GFP_KERNEL);
311 if (!si)
312 return NULL;
313 return &si->vfs_inode;
314}
315
316static void sysv_free_in_core_inode(struct inode *inode)
317{
318 kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
319}
320
321static void init_once(void *p)
322{
323 struct sysv_inode_info *si = (struct sysv_inode_info *)p;
324
325 inode_init_once(&si->vfs_inode);
326}
327
328const struct super_operations sysv_sops = {
329 .alloc_inode = sysv_alloc_inode,
330 .free_inode = sysv_free_in_core_inode,
331 .write_inode = sysv_write_inode,
332 .evict_inode = sysv_evict_inode,
333 .put_super = sysv_put_super,
334 .sync_fs = sysv_sync_fs,
335 .remount_fs = sysv_remount,
336 .statfs = sysv_statfs,
337};
338
339int __init sysv_init_icache(void)
340{
341 sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
342 sizeof(struct sysv_inode_info), 0,
343 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
344 init_once);
345 if (!sysv_inode_cachep)
346 return -ENOMEM;
347 return 0;
348}
349
350void sysv_destroy_icache(void)
351{
352
353
354
355
356 rcu_barrier();
357 kmem_cache_destroy(sysv_inode_cachep);
358}
359
