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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [affs/] [inode.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 1275 phoenix
/*
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
 
13
#include <asm/div64.h>
14
#include <linux/errno.h>
15
#include <linux/fs.h>
16
#include <linux/slab.h>
17
#include <linux/stat.h>
18
#include <linux/sched.h>
19
#include <linux/affs_fs.h>
20
#include <linux/kernel.h>
21
#include <linux/mm.h>
22
#include <linux/string.h>
23
#include <linux/locks.h>
24
#include <linux/genhd.h>
25
#include <linux/amigaffs.h>
26
#include <linux/major.h>
27
#include <linux/blkdev.h>
28
#include <linux/init.h>
29
#include <linux/smp_lock.h>
30
#include <asm/system.h>
31
#include <asm/uaccess.h>
32
#include <linux/module.h>
33
 
34
extern struct inode_operations affs_symlink_inode_operations;
35
extern struct timezone sys_tz;
36
 
37
void
38
affs_read_inode(struct inode *inode)
39
{
40
        struct super_block      *sb = inode->i_sb;
41
        struct buffer_head      *bh;
42
        struct affs_head        *head;
43
        struct affs_tail        *tail;
44
        u32                      block;
45
        u32                      size;
46
        u32                      prot;
47
        u16                      id;
48
 
49
        pr_debug("AFFS: read_inode(%lu)\n",inode->i_ino);
50
 
51
        block = inode->i_ino;
52
        bh = affs_bread(sb, block);
53
        if (!bh) {
54
                affs_warning(sb, "read_inode", "Cannot read block %d", block);
55
                goto bad_inode;
56
        }
57
        if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
58
                affs_warning(sb,"read_inode",
59
                           "Checksum or type (ptype=%d) error on inode %d",
60
                           AFFS_HEAD(bh)->ptype, block);
61
                goto bad_inode;
62
        }
63
 
64
        head = AFFS_HEAD(bh);
65
        tail = AFFS_TAIL(sb, bh);
66
        prot = be32_to_cpu(tail->protect);
67
 
68
        inode->i_size = 0;
69
        inode->i_nlink = 1;
70
        inode->i_mode = 0;
71
        memset(AFFS_INODE, 0, sizeof(*AFFS_INODE));
72
        init_MUTEX(&AFFS_INODE->i_link_lock);
73
        init_MUTEX(&AFFS_INODE->i_ext_lock);
74
        AFFS_INODE->i_extcnt = 1;
75
        AFFS_INODE->i_ext_last = ~1;
76
        AFFS_INODE->i_protect = prot;
77
 
78
        if (AFFS_SB->s_flags & SF_SETMODE)
79
                inode->i_mode = AFFS_SB->s_mode;
80
        else
81
                inode->i_mode = prot_to_mode(prot);
82
 
83
        id = be16_to_cpu(tail->uid);
84
        if (id == 0 || AFFS_SB->s_flags & SF_SETUID)
85
                inode->i_uid = AFFS_SB->s_uid;
86
        else if (id == 0xFFFF && AFFS_SB->s_flags & SF_MUFS)
87
                inode->i_uid = 0;
88
        else
89
                inode->i_uid = id;
90
 
91
        id = be16_to_cpu(tail->gid);
92
        if (id == 0 || AFFS_SB->s_flags & SF_SETGID)
93
                inode->i_gid = AFFS_SB->s_gid;
94
        else if (id == 0xFFFF && AFFS_SB->s_flags & SF_MUFS)
95
                inode->i_gid = 0;
96
        else
97
                inode->i_gid = id;
98
 
99
        switch (be32_to_cpu(tail->stype)) {
100
        case ST_ROOT:
101
                inode->i_uid = AFFS_SB->s_uid;
102
                inode->i_gid = AFFS_SB->s_gid;
103
                /* fall through */
104
        case ST_USERDIR:
105
                if (be32_to_cpu(tail->stype) == ST_USERDIR ||
106
                    AFFS_SB->s_flags & SF_SETMODE) {
107
                        if (inode->i_mode & S_IRUSR)
108
                                inode->i_mode |= S_IXUSR;
109
                        if (inode->i_mode & S_IRGRP)
110
                                inode->i_mode |= S_IXGRP;
111
                        if (inode->i_mode & S_IROTH)
112
                                inode->i_mode |= S_IXOTH;
113
                        inode->i_mode |= S_IFDIR;
114
                } else
115
                        inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
116
                if (tail->link_chain)
117
                        inode->i_nlink = 2;
118
                /* Maybe it should be controlled by mount parameter? */
119
                //inode->i_mode |= S_ISVTX;
120
                inode->i_op = &affs_dir_inode_operations;
121
                inode->i_fop = &affs_dir_operations;
122
                break;
123
        case ST_LINKDIR:
124
#if 0
125
                affs_warning(sb, "read_inode", "inode is LINKDIR");
126
                goto bad_inode;
127
#else
128
                inode->i_mode |= S_IFDIR;
129
                inode->i_op = NULL;
130
                inode->i_fop = NULL;
131
                break;
132
#endif
133
        case ST_LINKFILE:
134
                affs_warning(sb, "read_inode", "inode is LINKFILE");
135
                goto bad_inode;
136
        case ST_FILE:
137
                size = be32_to_cpu(tail->size);
138
                inode->i_mode |= S_IFREG;
139
                AFFS_INODE->mmu_private = inode->i_size = size;
140
                if (inode->i_size) {
141
                        AFFS_INODE->i_blkcnt = (size - 1) /
142
                                               AFFS_SB->s_data_blksize + 1;
143
                        AFFS_INODE->i_extcnt = (AFFS_INODE->i_blkcnt - 1) /
144
                                               AFFS_SB->s_hashsize + 1;
145
                }
146
                if (tail->link_chain)
147
                        inode->i_nlink = 2;
148
                inode->i_mapping->a_ops = (AFFS_SB->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
149
                inode->i_op = &affs_file_inode_operations;
150
                inode->i_fop = &affs_file_operations;
151
                break;
152
        case ST_SOFTLINK:
153
                inode->i_mode |= S_IFLNK;
154
                inode->i_op = &affs_symlink_inode_operations;
155
                inode->i_data.a_ops = &affs_symlink_aops;
156
                break;
157
        }
158
 
159
        inode->i_mtime = inode->i_atime = inode->i_ctime
160
                       = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
161
                         be32_to_cpu(tail->change.mins) * 60 +
162
                         be32_to_cpu(tail->change.ticks) / 50 +
163
                         ((8 * 365 + 2) * 24 * 60 * 60)) +
164
                         sys_tz.tz_minuteswest * 60;
165
        affs_brelse(bh);
166
        return;
167
 
168
bad_inode:
169
        make_bad_inode(inode);
170
        affs_brelse(bh);
171
        return;
172
}
173
 
174
void
175
affs_write_inode(struct inode *inode, int unused)
176
{
177
        struct super_block      *sb = inode->i_sb;
178
        struct buffer_head      *bh;
179
        struct affs_tail        *tail;
180
        uid_t                    uid;
181
        gid_t                    gid;
182
 
183
        pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
184
 
185
        if (!inode->i_nlink)
186
                // possibly free block
187
                return;
188
        lock_kernel();
189
        bh = affs_bread(sb, inode->i_ino);
190
        if (!bh) {
191
                affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
192
                unlock_kernel();
193
                return;
194
        }
195
        tail = AFFS_TAIL(sb, bh);
196
        if (tail->stype == be32_to_cpu(ST_ROOT)) {
197
                secs_to_datestamp(inode->i_mtime,&AFFS_ROOT_TAIL(sb, bh)->root_change);
198
        } else {
199
                tail->protect = cpu_to_be32(AFFS_INODE->i_protect);
200
                tail->size = cpu_to_be32(inode->i_size);
201
                secs_to_datestamp(inode->i_mtime,&tail->change);
202
                if (!(inode->i_ino == AFFS_SB->s_root_block)) {
203
                        uid = inode->i_uid;
204
                        gid = inode->i_gid;
205
                        if (sb->u.affs_sb.s_flags & SF_MUFS) {
206
                                if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
207
                                        uid = inode->i_uid ^ ~0;
208
                                if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
209
                                        gid = inode->i_gid ^ ~0;
210
                        }
211
                        if (!(sb->u.affs_sb.s_flags & SF_SETUID))
212
                                tail->uid = cpu_to_be16(uid);
213
                        if (!(sb->u.affs_sb.s_flags & SF_SETGID))
214
                                tail->gid = cpu_to_be16(gid);
215
                }
216
        }
217
        affs_fix_checksum(sb, bh);
218
        mark_buffer_dirty_inode(bh, inode);
219
        affs_brelse(bh);
220
        unlock_kernel();
221
}
222
 
223
int
224
affs_notify_change(struct dentry *dentry, struct iattr *attr)
225
{
226
        struct inode *inode = dentry->d_inode;
227
        int error;
228
 
229
        pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
230
 
231
        error = inode_change_ok(inode,attr);
232
        if (error)
233
                goto out;
234
 
235
        if (((attr->ia_valid & ATTR_UID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETUID)) ||
236
            ((attr->ia_valid & ATTR_GID) && (inode->i_sb->u.affs_sb.s_flags & SF_SETGID)) ||
237
            ((attr->ia_valid & ATTR_MODE) &&
238
             (inode->i_sb->u.affs_sb.s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
239
                if (!(inode->i_sb->u.affs_sb.s_flags & SF_QUIET))
240
                        error = -EPERM;
241
                goto out;
242
        }
243
 
244
        inode_setattr(inode, attr);
245
        if (!error && (attr->ia_valid & ATTR_MODE))
246
                mode_to_prot(inode);
247
out:
248
        return error;
249
}
250
 
251
void
252
affs_put_inode(struct inode *inode)
253
{
254
        pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
255
        lock_kernel();
256
        affs_free_prealloc(inode);
257
        if (atomic_read(&inode->i_count) == 1) {
258
                if (inode->i_size != AFFS_INODE->mmu_private)
259
                        affs_truncate(inode);
260
                //if (inode->i_nlink)
261
                //      affs_clear_inode(inode);
262
        }
263
        unlock_kernel();
264
}
265
 
266
void
267
affs_delete_inode(struct inode *inode)
268
{
269
        pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
270
        lock_kernel();
271
        inode->i_size = 0;
272
        if (S_ISREG(inode->i_mode))
273
                affs_truncate(inode);
274
        clear_inode(inode);
275
        affs_free_block(inode->i_sb, inode->i_ino);
276
        unlock_kernel();
277
}
278
 
279
void
280
affs_clear_inode(struct inode *inode)
281
{
282
        unsigned long cache_page = (unsigned long) inode->u.affs_i.i_lc;
283
 
284
        pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
285
        if (cache_page) {
286
                pr_debug("AFFS: freeing ext cache\n");
287
                inode->u.affs_i.i_lc = NULL;
288
                inode->u.affs_i.i_ac = NULL;
289
                free_page(cache_page);
290
        }
291
        affs_brelse(AFFS_INODE->i_ext_bh);
292
        AFFS_INODE->i_ext_last = ~1;
293
        AFFS_INODE->i_ext_bh = NULL;
294
}
295
 
296
struct inode *
297
affs_new_inode(struct inode *dir)
298
{
299
        struct super_block      *sb = dir->i_sb;
300
        struct inode            *inode;
301
        u32                      block;
302
        struct buffer_head      *bh;
303
 
304
        if (!(inode = new_inode(sb)))
305
                goto err_inode;
306
 
307
        if (!(block = affs_alloc_block(dir, dir->i_ino)))
308
                goto err_block;
309
 
310
        bh = affs_getzeroblk(sb, block);
311
        if (!bh)
312
                goto err_bh;
313
        mark_buffer_dirty_inode(bh, inode);
314
        affs_brelse(bh);
315
 
316
        inode->i_uid     = current->fsuid;
317
        inode->i_gid     = current->fsgid;
318
        inode->i_ino     = block;
319
        inode->i_nlink   = 1;
320
        inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME;
321
        memset(AFFS_INODE, 0, sizeof(*AFFS_INODE));
322
        AFFS_INODE->i_extcnt = 1;
323
        AFFS_INODE->i_ext_last = ~1;
324
        init_MUTEX(&AFFS_INODE->i_link_lock);
325
        init_MUTEX(&AFFS_INODE->i_ext_lock);
326
 
327
        insert_inode_hash(inode);
328
 
329
        return inode;
330
 
331
err_bh:
332
        affs_free_block(sb, block);
333
err_block:
334
        iput(inode);
335
err_inode:
336
        return NULL;
337
}
338
 
339
/*
340
 * Add an entry to a directory. Create the header block
341
 * and insert it into the hash table.
342
 */
343
 
344
int
345
affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
346
{
347
        struct super_block *sb = dir->i_sb;
348
        struct buffer_head *inode_bh = NULL;
349
        struct buffer_head *bh = NULL;
350
        u32 block = 0;
351
        int retval;
352
 
353
        pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
354
                 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
355
 
356
        retval = -EIO;
357
        bh = affs_bread(sb, inode->i_ino);
358
        if (!bh)
359
                goto done;
360
 
361
        affs_lock_link(inode);
362
        switch (type) {
363
        case ST_LINKFILE:
364
        case ST_LINKDIR:
365
                inode_bh = bh;
366
                retval = -ENOSPC;
367
                block = affs_alloc_block(dir, dir->i_ino);
368
                if (!block)
369
                        goto err;
370
                retval = -EIO;
371
                bh = affs_getzeroblk(sb, block);
372
                if (!bh)
373
                        goto err;
374
                break;
375
        default:
376
                break;
377
        }
378
 
379
        AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
380
        AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
381
        affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
382
        AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
383
        AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
384
 
385
        if (inode_bh) {
386
                u32 chain;
387
                chain = AFFS_TAIL(sb, inode_bh)->link_chain;
388
                AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
389
                AFFS_TAIL(sb, bh)->link_chain = chain;
390
                AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
391
                affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
392
                mark_buffer_dirty_inode(inode_bh, inode);
393
                inode->i_nlink = 2;
394
                atomic_inc(&inode->i_count);
395
        }
396
        affs_fix_checksum(sb, bh);
397
        mark_buffer_dirty_inode(bh, inode);
398
        dentry->d_fsdata = (void *)bh->b_blocknr;
399
 
400
        affs_lock_dir(dir);
401
        retval = affs_insert_hash(dir, bh);
402
        mark_buffer_dirty_inode(bh, inode);
403
        affs_unlock_dir(dir);
404
        affs_unlock_link(inode);
405
 
406
        d_instantiate(dentry, inode);
407
done:
408
        affs_brelse(inode_bh);
409
        affs_brelse(bh);
410
        return retval;
411
err:
412
        if (block)
413
                affs_free_block(sb, block);
414
        affs_unlock_link(inode);
415
        goto done;
416
}
417
MODULE_LICENSE("GPL");

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