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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [affs/] [inode.c] - Blame information for rev 78

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Line No. Rev Author Line
1 62 marcus.erl
/*
2
 *  linux/fs/affs/inode.c
3
 *
4
 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
5
 *
6
 *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
7
 *
8
 *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
9
 *
10
 *  (C) 1991  Linus Torvalds - minix filesystem
11
 */
12
#include <linux/sched.h>
13
#include "affs.h"
14
 
15
extern const struct inode_operations affs_symlink_inode_operations;
16
extern struct timezone sys_tz;
17
 
18
void
19
affs_read_inode(struct inode *inode)
20
{
21
        struct super_block      *sb = inode->i_sb;
22
        struct affs_sb_info     *sbi = AFFS_SB(sb);
23
        struct buffer_head      *bh;
24
        struct affs_head        *head;
25
        struct affs_tail        *tail;
26
        u32                      block;
27
        u32                      size;
28
        u32                      prot;
29
        u16                      id;
30
 
31
        pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
32
 
33
        block = inode->i_ino;
34
        bh = affs_bread(sb, block);
35
        if (!bh) {
36
                affs_warning(sb, "read_inode", "Cannot read block %d", block);
37
                goto bad_inode;
38
        }
39
        if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
40
                affs_warning(sb,"read_inode",
41
                           "Checksum or type (ptype=%d) error on inode %d",
42
                           AFFS_HEAD(bh)->ptype, block);
43
                goto bad_inode;
44
        }
45
 
46
        head = AFFS_HEAD(bh);
47
        tail = AFFS_TAIL(sb, bh);
48
        prot = be32_to_cpu(tail->protect);
49
 
50
        inode->i_size = 0;
51
        inode->i_nlink = 1;
52
        inode->i_mode = 0;
53
        AFFS_I(inode)->i_extcnt = 1;
54
        AFFS_I(inode)->i_ext_last = ~1;
55
        AFFS_I(inode)->i_protect = prot;
56
        AFFS_I(inode)->i_opencnt = 0;
57
        AFFS_I(inode)->i_blkcnt = 0;
58
        AFFS_I(inode)->i_lc = NULL;
59
        AFFS_I(inode)->i_lc_size = 0;
60
        AFFS_I(inode)->i_lc_shift = 0;
61
        AFFS_I(inode)->i_lc_mask = 0;
62
        AFFS_I(inode)->i_ac = NULL;
63
        AFFS_I(inode)->i_ext_bh = NULL;
64
        AFFS_I(inode)->mmu_private = 0;
65
        AFFS_I(inode)->i_lastalloc = 0;
66
        AFFS_I(inode)->i_pa_cnt = 0;
67
 
68
        if (sbi->s_flags & SF_SETMODE)
69
                inode->i_mode = sbi->s_mode;
70
        else
71
                inode->i_mode = prot_to_mode(prot);
72
 
73
        id = be16_to_cpu(tail->uid);
74
        if (id == 0 || sbi->s_flags & SF_SETUID)
75
                inode->i_uid = sbi->s_uid;
76
        else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
77
                inode->i_uid = 0;
78
        else
79
                inode->i_uid = id;
80
 
81
        id = be16_to_cpu(tail->gid);
82
        if (id == 0 || sbi->s_flags & SF_SETGID)
83
                inode->i_gid = sbi->s_gid;
84
        else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
85
                inode->i_gid = 0;
86
        else
87
                inode->i_gid = id;
88
 
89
        switch (be32_to_cpu(tail->stype)) {
90
        case ST_ROOT:
91
                inode->i_uid = sbi->s_uid;
92
                inode->i_gid = sbi->s_gid;
93
                /* fall through */
94
        case ST_USERDIR:
95
                if (be32_to_cpu(tail->stype) == ST_USERDIR ||
96
                    sbi->s_flags & SF_SETMODE) {
97
                        if (inode->i_mode & S_IRUSR)
98
                                inode->i_mode |= S_IXUSR;
99
                        if (inode->i_mode & S_IRGRP)
100
                                inode->i_mode |= S_IXGRP;
101
                        if (inode->i_mode & S_IROTH)
102
                                inode->i_mode |= S_IXOTH;
103
                        inode->i_mode |= S_IFDIR;
104
                } else
105
                        inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
106
                if (tail->link_chain)
107
                        inode->i_nlink = 2;
108
                /* Maybe it should be controlled by mount parameter? */
109
                //inode->i_mode |= S_ISVTX;
110
                inode->i_op = &affs_dir_inode_operations;
111
                inode->i_fop = &affs_dir_operations;
112
                break;
113
        case ST_LINKDIR:
114
#if 0
115
                affs_warning(sb, "read_inode", "inode is LINKDIR");
116
                goto bad_inode;
117
#else
118
                inode->i_mode |= S_IFDIR;
119
                inode->i_op = NULL;
120
                inode->i_fop = NULL;
121
                break;
122
#endif
123
        case ST_LINKFILE:
124
                affs_warning(sb, "read_inode", "inode is LINKFILE");
125
                goto bad_inode;
126
        case ST_FILE:
127
                size = be32_to_cpu(tail->size);
128
                inode->i_mode |= S_IFREG;
129
                AFFS_I(inode)->mmu_private = inode->i_size = size;
130
                if (inode->i_size) {
131
                        AFFS_I(inode)->i_blkcnt = (size - 1) /
132
                                               sbi->s_data_blksize + 1;
133
                        AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
134
                                               sbi->s_hashsize + 1;
135
                }
136
                if (tail->link_chain)
137
                        inode->i_nlink = 2;
138
                inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
139
                inode->i_op = &affs_file_inode_operations;
140
                inode->i_fop = &affs_file_operations;
141
                break;
142
        case ST_SOFTLINK:
143
                inode->i_mode |= S_IFLNK;
144
                inode->i_op = &affs_symlink_inode_operations;
145
                inode->i_data.a_ops = &affs_symlink_aops;
146
                break;
147
        }
148
 
149
        inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
150
                       = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
151
                         be32_to_cpu(tail->change.mins) * 60 +
152
                         be32_to_cpu(tail->change.ticks) / 50 +
153
                         ((8 * 365 + 2) * 24 * 60 * 60)) +
154
                         sys_tz.tz_minuteswest * 60;
155
        inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
156
        affs_brelse(bh);
157
        return;
158
 
159
bad_inode:
160
        make_bad_inode(inode);
161
        affs_brelse(bh);
162
        return;
163
}
164
 
165
int
166
affs_write_inode(struct inode *inode, int unused)
167
{
168
        struct super_block      *sb = inode->i_sb;
169
        struct buffer_head      *bh;
170
        struct affs_tail        *tail;
171
        uid_t                    uid;
172
        gid_t                    gid;
173
 
174
        pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
175
 
176
        if (!inode->i_nlink)
177
                // possibly free block
178
                return 0;
179
        bh = affs_bread(sb, inode->i_ino);
180
        if (!bh) {
181
                affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
182
                return -EIO;
183
        }
184
        tail = AFFS_TAIL(sb, bh);
185
        if (tail->stype == cpu_to_be32(ST_ROOT)) {
186
                secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
187
        } else {
188
                tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
189
                tail->size = cpu_to_be32(inode->i_size);
190
                secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
191
                if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
192
                        uid = inode->i_uid;
193
                        gid = inode->i_gid;
194
                        if (AFFS_SB(sb)->s_flags & SF_MUFS) {
195
                                if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
196
                                        uid = inode->i_uid ^ ~0;
197
                                if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
198
                                        gid = inode->i_gid ^ ~0;
199
                        }
200
                        if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
201
                                tail->uid = cpu_to_be16(uid);
202
                        if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
203
                                tail->gid = cpu_to_be16(gid);
204
                }
205
        }
206
        affs_fix_checksum(sb, bh);
207
        mark_buffer_dirty_inode(bh, inode);
208
        affs_brelse(bh);
209
        affs_free_prealloc(inode);
210
        return 0;
211
}
212
 
213
int
214
affs_notify_change(struct dentry *dentry, struct iattr *attr)
215
{
216
        struct inode *inode = dentry->d_inode;
217
        int error;
218
 
219
        pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
220
 
221
        error = inode_change_ok(inode,attr);
222
        if (error)
223
                goto out;
224
 
225
        if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
226
            ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
227
            ((attr->ia_valid & ATTR_MODE) &&
228
             (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
229
                if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
230
                        error = -EPERM;
231
                goto out;
232
        }
233
 
234
        error = inode_setattr(inode, attr);
235
        if (!error && (attr->ia_valid & ATTR_MODE))
236
                mode_to_prot(inode);
237
out:
238
        return error;
239
}
240
 
241
void
242
affs_put_inode(struct inode *inode)
243
{
244
        pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
245
        affs_free_prealloc(inode);
246
}
247
 
248
void
249
affs_drop_inode(struct inode *inode)
250
{
251
        mutex_lock(&inode->i_mutex);
252
        if (inode->i_size != AFFS_I(inode)->mmu_private)
253
                affs_truncate(inode);
254
        mutex_unlock(&inode->i_mutex);
255
 
256
        generic_drop_inode(inode);
257
}
258
 
259
void
260
affs_delete_inode(struct inode *inode)
261
{
262
        pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
263
        truncate_inode_pages(&inode->i_data, 0);
264
        inode->i_size = 0;
265
        if (S_ISREG(inode->i_mode))
266
                affs_truncate(inode);
267
        clear_inode(inode);
268
        affs_free_block(inode->i_sb, inode->i_ino);
269
}
270
 
271
void
272
affs_clear_inode(struct inode *inode)
273
{
274
        unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc;
275
 
276
        pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
277
        if (cache_page) {
278
                pr_debug("AFFS: freeing ext cache\n");
279
                AFFS_I(inode)->i_lc = NULL;
280
                AFFS_I(inode)->i_ac = NULL;
281
                free_page(cache_page);
282
        }
283
        affs_brelse(AFFS_I(inode)->i_ext_bh);
284
        AFFS_I(inode)->i_ext_last = ~1;
285
        AFFS_I(inode)->i_ext_bh = NULL;
286
}
287
 
288
struct inode *
289
affs_new_inode(struct inode *dir)
290
{
291
        struct super_block      *sb = dir->i_sb;
292
        struct inode            *inode;
293
        u32                      block;
294
        struct buffer_head      *bh;
295
 
296
        if (!(inode = new_inode(sb)))
297
                goto err_inode;
298
 
299
        if (!(block = affs_alloc_block(dir, dir->i_ino)))
300
                goto err_block;
301
 
302
        bh = affs_getzeroblk(sb, block);
303
        if (!bh)
304
                goto err_bh;
305
        mark_buffer_dirty_inode(bh, inode);
306
        affs_brelse(bh);
307
 
308
        inode->i_uid     = current->fsuid;
309
        inode->i_gid     = current->fsgid;
310
        inode->i_ino     = block;
311
        inode->i_nlink   = 1;
312
        inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
313
        AFFS_I(inode)->i_opencnt = 0;
314
        AFFS_I(inode)->i_blkcnt = 0;
315
        AFFS_I(inode)->i_lc = NULL;
316
        AFFS_I(inode)->i_lc_size = 0;
317
        AFFS_I(inode)->i_lc_shift = 0;
318
        AFFS_I(inode)->i_lc_mask = 0;
319
        AFFS_I(inode)->i_ac = NULL;
320
        AFFS_I(inode)->i_ext_bh = NULL;
321
        AFFS_I(inode)->mmu_private = 0;
322
        AFFS_I(inode)->i_protect = 0;
323
        AFFS_I(inode)->i_lastalloc = 0;
324
        AFFS_I(inode)->i_pa_cnt = 0;
325
        AFFS_I(inode)->i_extcnt = 1;
326
        AFFS_I(inode)->i_ext_last = ~1;
327
 
328
        insert_inode_hash(inode);
329
 
330
        return inode;
331
 
332
err_bh:
333
        affs_free_block(sb, block);
334
err_block:
335
        iput(inode);
336
err_inode:
337
        return NULL;
338
}
339
 
340
/*
341
 * Add an entry to a directory. Create the header block
342
 * and insert it into the hash table.
343
 */
344
 
345
int
346
affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
347
{
348
        struct super_block *sb = dir->i_sb;
349
        struct buffer_head *inode_bh = NULL;
350
        struct buffer_head *bh = NULL;
351
        u32 block = 0;
352
        int retval;
353
 
354
        pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
355
                 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
356
 
357
        retval = -EIO;
358
        bh = affs_bread(sb, inode->i_ino);
359
        if (!bh)
360
                goto done;
361
 
362
        affs_lock_link(inode);
363
        switch (type) {
364
        case ST_LINKFILE:
365
        case ST_LINKDIR:
366
                inode_bh = bh;
367
                retval = -ENOSPC;
368
                block = affs_alloc_block(dir, dir->i_ino);
369
                if (!block)
370
                        goto err;
371
                retval = -EIO;
372
                bh = affs_getzeroblk(sb, block);
373
                if (!bh)
374
                        goto err;
375
                break;
376
        default:
377
                break;
378
        }
379
 
380
        AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
381
        AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
382
        affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
383
        AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
384
        AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
385
 
386
        if (inode_bh) {
387
                __be32 chain;
388
                chain = AFFS_TAIL(sb, inode_bh)->link_chain;
389
                AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
390
                AFFS_TAIL(sb, bh)->link_chain = chain;
391
                AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
392
                affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
393
                mark_buffer_dirty_inode(inode_bh, inode);
394
                inode->i_nlink = 2;
395
                atomic_inc(&inode->i_count);
396
        }
397
        affs_fix_checksum(sb, bh);
398
        mark_buffer_dirty_inode(bh, inode);
399
        dentry->d_fsdata = (void *)(long)bh->b_blocknr;
400
 
401
        affs_lock_dir(dir);
402
        retval = affs_insert_hash(dir, bh);
403
        mark_buffer_dirty_inode(bh, inode);
404
        affs_unlock_dir(dir);
405
        affs_unlock_link(inode);
406
 
407
        d_instantiate(dentry, inode);
408
done:
409
        affs_brelse(inode_bh);
410
        affs_brelse(bh);
411
        return retval;
412
err:
413
        if (block)
414
                affs_free_block(sb, block);
415
        affs_unlock_link(inode);
416
        goto done;
417
}

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