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[mirror_ubuntu-bionic-kernel.git] / fs / affs / super.c
CommitLineData
1da177e4
LT		 1/*
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 ISO 9660 filesystem.
9 *
10 * (C) 1991 Linus Torvalds - minix filesystem
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/statfs.h>
16#include <linux/parser.h>
17#include "affs.h"
18
19extern struct timezone sys_tz;
20
726c3342 21static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
1da177e4
LT		 22static int affs_remount (struct super_block *sb, int *flags, char *data);
23
24static void
25affs_put_super(struct super_block *sb)
26{
27 struct affs_sb_info *sbi = AFFS_SB(sb);
28 pr_debug("AFFS: put_super()\n");
29
30 if (!(sb->s_flags & MS_RDONLY)) {
31 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
32 secs_to_datestamp(get_seconds(),
33 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
34 affs_fix_checksum(sb, sbi->s_root_bh);
35 mark_buffer_dirty(sbi->s_root_bh);
36 }
37
f99d49ad 38 kfree(sbi->s_prefix);
1da177e4
LT		 39 affs_free_bitmap(sb);
40 affs_brelse(sbi->s_root_bh);
41 kfree(sbi);
42 sb->s_fs_info = NULL;
43 return;
44}
45
46static void
47affs_write_super(struct super_block *sb)
48{
49 int clean = 2;
50 struct affs_sb_info *sbi = AFFS_SB(sb);
51
52 if (!(sb->s_flags & MS_RDONLY)) {
53 // if (sbi->s_bitmap[i].bm_bh) {
54 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
55 // clean = 0;
56 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
57 secs_to_datestamp(get_seconds(),
58 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
59 affs_fix_checksum(sb, sbi->s_root_bh);
60 mark_buffer_dirty(sbi->s_root_bh);
61 sb->s_dirt = !clean; /* redo until bitmap synced */
62 } else
63 sb->s_dirt = 0;
64
65 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
66}
67
68static kmem_cache_t * affs_inode_cachep;
69
70static struct inode *affs_alloc_inode(struct super_block *sb)
71{
72 struct affs_inode_info *ei;
73 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL);
74 if (!ei)
75 return NULL;
76 ei->vfs_inode.i_version = 1;
77 return &ei->vfs_inode;
78}
79
80static void affs_destroy_inode(struct inode *inode)
81{
82 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
83}
84
85static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
86{
87 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
88
89 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
90 SLAB_CTOR_CONSTRUCTOR) {
91 init_MUTEX(&ei->i_link_lock);
92 init_MUTEX(&ei->i_ext_lock);
93 inode_init_once(&ei->vfs_inode);
94 }
95}
96
97static int init_inodecache(void)
98{
99 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
100 sizeof(struct affs_inode_info),
fffb60f9
PJ		 101 0, (SLAB_RECLAIM_ACCOUNT|
102 SLAB_MEM_SPREAD),
1da177e4
LT		 103 init_once, NULL);
104 if (affs_inode_cachep == NULL)
105 return -ENOMEM;
106 return 0;
107}
108
109static void destroy_inodecache(void)
110{
111 if (kmem_cache_destroy(affs_inode_cachep))
112 printk(KERN_INFO "affs_inode_cache: not all structures were freed\n");
113}
114
115static struct super_operations affs_sops = {
116 .alloc_inode = affs_alloc_inode,
117 .destroy_inode = affs_destroy_inode,
118 .read_inode = affs_read_inode,
119 .write_inode = affs_write_inode,
120 .put_inode = affs_put_inode,
121 .delete_inode = affs_delete_inode,
122 .clear_inode = affs_clear_inode,
123 .put_super = affs_put_super,
124 .write_super = affs_write_super,
125 .statfs = affs_statfs,
126 .remount_fs = affs_remount,
127};
128
129enum {
130 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
131 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
132 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
133};
134
135static match_table_t tokens = {
136 {Opt_bs, "bs=%u"},
137 {Opt_mode, "mode=%o"},
138 {Opt_mufs, "mufs"},
139 {Opt_prefix, "prefix=%s"},
140 {Opt_protect, "protect"},
141 {Opt_reserved, "reserved=%u"},
142 {Opt_root, "root=%u"},
143 {Opt_setgid, "setgid=%u"},
144 {Opt_setuid, "setuid=%u"},
145 {Opt_verbose, "verbose"},
146 {Opt_volume, "volume=%s"},
147 {Opt_ignore, "grpquota"},
148 {Opt_ignore, "noquota"},
149 {Opt_ignore, "quota"},
150 {Opt_ignore, "usrquota"},
151 {Opt_err, NULL},
152};
153
154static int
155parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
156 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
157{
158 char *p;
159 substring_t args[MAX_OPT_ARGS];
160
161 /* Fill in defaults */
162
163 *uid = current->uid;
164 *gid = current->gid;
165 *reserved = 2;
166 *root = -1;
167 *blocksize = -1;
168 volume[0] = ':';
169 volume[1] = 0;
170 *mount_opts = 0;
171 if (!options)
172 return 1;
173
174 while ((p = strsep(&options, ",")) != NULL) {
175 int token, n, option;
176 if (!*p)
177 continue;
178
179 token = match_token(p, tokens, args);
180 switch (token) {
181 case Opt_bs:
182 if (match_int(&args[0], &n))
183 return -EINVAL;
184 if (n != 512 && n != 1024 && n != 2048
185 && n != 4096) {
186 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
187 return 0;
188 }
189 *blocksize = n;
190 break;
191 case Opt_mode:
192 if (match_octal(&args[0], &option))
193 return 1;
194 *mode = option & 0777;
195 *mount_opts |= SF_SETMODE;
196 break;
197 case Opt_mufs:
198 *mount_opts |= SF_MUFS;
199 break;
200 case Opt_prefix:
f99d49ad
JJ		 201 /* Free any previous prefix */
202 kfree(*prefix);
203 *prefix = NULL;
1da177e4
LT		 204 *prefix = match_strdup(&args[0]);
205 if (!*prefix)
206 return 0;
207 *mount_opts |= SF_PREFIX;
208 break;
209 case Opt_protect:
210 *mount_opts |= SF_IMMUTABLE;
211 break;
212 case Opt_reserved:
213 if (match_int(&args[0], reserved))
214 return 1;
215 break;
216 case Opt_root:
217 if (match_int(&args[0], root))
218 return 1;
219 break;
220 case Opt_setgid:
221 if (match_int(&args[0], &option))
222 return 1;
223 *gid = option;
224 *mount_opts |= SF_SETGID;
225 break;
226 case Opt_setuid:
227 if (match_int(&args[0], &option))
228 return -EINVAL;
229 *uid = option;
230 *mount_opts |= SF_SETUID;
231 break;
232 case Opt_verbose:
233 *mount_opts |= SF_VERBOSE;
234 break;
235 case Opt_volume: {
236 char *vol = match_strdup(&args[0]);
237 strlcpy(volume, vol, 32);
238 kfree(vol);
239 break;
240 }
241 case Opt_ignore:
242 /* Silently ignore the quota options */
243 break;
244 default:
245 printk("AFFS: Unrecognized mount option \"%s\" "
246 "or missing value\n", p);
247 return 0;
248 }
249 }
250 return 1;
251}
252
253/* This function definitely needs to be split up. Some fine day I'll
254 * hopefully have the guts to do so. Until then: sorry for the mess.
255 */
256
257static int affs_fill_super(struct super_block *sb, void *data, int silent)
258{
259 struct affs_sb_info *sbi;
260 struct buffer_head *root_bh = NULL;
261 struct buffer_head *boot_bh;
262 struct inode *root_inode = NULL;
263 s32 root_block;
264 int size, blocksize;
265 u32 chksum;
266 int num_bm;
267 int i, j;
268 s32 key;
269 uid_t uid;
270 gid_t gid;
271 int reserved;
272 unsigned long mount_flags;
273 int tmp_flags; /* fix remount prototype... */
274
275 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
276
277 sb->s_magic = AFFS_SUPER_MAGIC;
278 sb->s_op = &affs_sops;
279 sb->s_flags |= MS_NODIRATIME;
280
281 sbi = kmalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
282 if (!sbi)
283 return -ENOMEM;
284 sb->s_fs_info = sbi;
285 memset(sbi, 0, sizeof(*sbi));
286 init_MUTEX(&sbi->s_bmlock);
287
288 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
289 &blocksize,&sbi->s_prefix,
290 sbi->s_volume, &mount_flags)) {
291 printk(KERN_ERR "AFFS: Error parsing options\n");
292 return -EINVAL;
293 }
294 /* N.B. after this point s_prefix must be released */
295
296 sbi->s_flags = mount_flags;
297 sbi->s_mode = i;
298 sbi->s_uid = uid;
299 sbi->s_gid = gid;
300 sbi->s_reserved= reserved;
301
302 /* Get the size of the device in 512-byte blocks.
303 * If we later see that the partition uses bigger
304 * blocks, we will have to change it.
305 */
306
307 size = sb->s_bdev->bd_inode->i_size >> 9;
308 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
309
310 affs_set_blocksize(sb, PAGE_SIZE);
311 /* Try to find root block. Its location depends on the block size. */
312
313 i = 512;
314 j = 4096;
315 if (blocksize > 0) {
316 i = j = blocksize;
317 size = size / (blocksize / 512);
318 }
319 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
320 sbi->s_root_block = root_block;
321 if (root_block < 0)
322 sbi->s_root_block = (reserved + size - 1) / 2;
323 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
324 affs_set_blocksize(sb, blocksize);
325 sbi->s_partition_size = size;
326
327 /* The root block location that was calculated above is not
328 * correct if the partition size is an odd number of 512-
329 * byte blocks, which will be rounded down to a number of
330 * 1024-byte blocks, and if there were an even number of
331 * reserved blocks. Ideally, all partition checkers should
332 * report the real number of blocks of the real blocksize,
333 * but since this just cannot be done, we have to try to
334 * find the root block anyways. In the above case, it is one
335 * block behind the calculated one. So we check this one, too.
336 */
337 for (num_bm = 0; num_bm < 2; num_bm++) {
338 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
339 "size=%d, reserved=%d\n",
340 sb->s_id,
341 sbi->s_root_block + num_bm,
342 blocksize, size, reserved);
343 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
344 if (!root_bh)
345 continue;
346 if (!affs_checksum_block(sb, root_bh) &&
347 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
348 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
349 sbi->s_hashsize = blocksize / 4 - 56;
350 sbi->s_root_block += num_bm;
351 key = 1;
352 goto got_root;
353 }
354 affs_brelse(root_bh);
355 root_bh = NULL;
356 }
357 }
358 if (!silent)
359 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
360 sb->s_id);
361 goto out_error;
362
363 /* N.B. after this point bh must be released */
364got_root:
365 root_block = sbi->s_root_block;
366
367 /* Find out which kind of FS we have */
368 boot_bh = sb_bread(sb, 0);
369 if (!boot_bh) {
370 printk(KERN_ERR "AFFS: Cannot read boot block\n");
371 goto out_error;
372 }
373 chksum = be32_to_cpu(*(__be32 *)boot_bh->b_data);
374 brelse(boot_bh);
375
376 /* Dircache filesystems are compatible with non-dircache ones
377 * when reading. As long as they aren't supported, writing is
378 * not recommended.
379 */
380 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
381 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
382 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
383 sb->s_id);
384 sb->s_flags |= MS_RDONLY;
385 }
386 switch (chksum) {
387 case MUFS_FS:
388 case MUFS_INTLFFS:
389 case MUFS_DCFFS:
390 sbi->s_flags |= SF_MUFS;
391 /* fall thru */
392 case FS_INTLFFS:
393 case FS_DCFFS:
394 sbi->s_flags |= SF_INTL;
395 break;
396 case MUFS_FFS:
397 sbi->s_flags |= SF_MUFS;
398 break;
399 case FS_FFS:
400 break;
401 case MUFS_OFS:
402 sbi->s_flags |= SF_MUFS;
403 /* fall thru */
404 case FS_OFS:
405 sbi->s_flags |= SF_OFS;
406 sb->s_flags |= MS_NOEXEC;
407 break;
408 case MUFS_DCOFS:
409 case MUFS_INTLOFS:
410 sbi->s_flags |= SF_MUFS;
411 case FS_DCOFS:
412 case FS_INTLOFS:
413 sbi->s_flags |= SF_INTL | SF_OFS;
414 sb->s_flags |= MS_NOEXEC;
415 break;
416 default:
417 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
418 sb->s_id, chksum);
419 goto out_error;
420 }
421
422 if (mount_flags & SF_VERBOSE) {
423 chksum = cpu_to_be32(chksum);
424 printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
425 AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
426 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
427 (char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
428 }
429
430 sb->s_flags |= MS_NODEV | MS_NOSUID;
431
432 sbi->s_data_blksize = sb->s_blocksize;
433 if (sbi->s_flags & SF_OFS)
434 sbi->s_data_blksize -= 24;
435
436 /* Keep super block in cache */
437 sbi->s_root_bh = root_bh;
438 /* N.B. after this point s_root_bh must be released */
439
440 tmp_flags = sb->s_flags;
441 if (affs_init_bitmap(sb, &tmp_flags))
442 goto out_error;
443 sb->s_flags = tmp_flags;
444
445 /* set up enough so that it can read an inode */
446
447 root_inode = iget(sb, root_block);
448 sb->s_root = d_alloc_root(root_inode);
449 if (!sb->s_root) {
450 printk(KERN_ERR "AFFS: Get root inode failed\n");
451 goto out_error;
452 }
453 sb->s_root->d_op = &affs_dentry_operations;
454
455 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
456 return 0;
457
458 /*
459 * Begin the cascaded cleanup ...
460 */
461out_error:
462 if (root_inode)
463 iput(root_inode);
f99d49ad 464 kfree(sbi->s_bitmap);
1da177e4 465 affs_brelse(root_bh);
f99d49ad 466 kfree(sbi->s_prefix);
1da177e4
LT		 467 kfree(sbi);
468 sb->s_fs_info = NULL;
469 return -EINVAL;
470}
471
472static int
473affs_remount(struct super_block *sb, int *flags, char *data)
474{
475 struct affs_sb_info *sbi = AFFS_SB(sb);
476 int blocksize;
477 uid_t uid;
478 gid_t gid;
479 int mode;
480 int reserved;
481 int root_block;
482 unsigned long mount_flags;
483 int res = 0;
484
485 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
486
487 *flags |= MS_NODIRATIME;
488
489 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
490 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
491 return -EINVAL;
492 sbi->s_flags = mount_flags;
493 sbi->s_mode = mode;
494 sbi->s_uid = uid;
495 sbi->s_gid = gid;
496
497 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
498 return 0;
499 if (*flags & MS_RDONLY) {
500 sb->s_dirt = 1;
501 while (sb->s_dirt)
502 affs_write_super(sb);
503 affs_free_bitmap(sb);
504 } else
505 res = affs_init_bitmap(sb, flags);
506
507 return res;
508}
509
510static int
726c3342 511affs_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 512{
726c3342 513 struct super_block *sb = dentry->d_sb;
1da177e4
LT		 514 int free;
515
516 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
517 AFFS_SB(sb)->s_reserved);
518
519 free = affs_count_free_blocks(sb);
520 buf->f_type = AFFS_SUPER_MAGIC;
521 buf->f_bsize = sb->s_blocksize;
522 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
523 buf->f_bfree = free;
524 buf->f_bavail = free;
525 return 0;
526}
527
454e2398
DH		 528static int affs_get_sb(struct file_system_type *fs_type,
529 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 530{
454e2398
DH		 531 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
532 mnt);
1da177e4
LT		 533}
534
535static struct file_system_type affs_fs_type = {
536 .owner = THIS_MODULE,
537 .name = "affs",
538 .get_sb = affs_get_sb,
539 .kill_sb = kill_block_super,
540 .fs_flags = FS_REQUIRES_DEV,
541};
542
543static int __init init_affs_fs(void)
544{
545 int err = init_inodecache();
546 if (err)
547 goto out1;
548 err = register_filesystem(&affs_fs_type);
549 if (err)
550 goto out;
551 return 0;
552out:
553 destroy_inodecache();
554out1:
555 return err;
556}
557
558static void __exit exit_affs_fs(void)
559{
560 unregister_filesystem(&affs_fs_type);
561 destroy_inodecache();
562}
563
564MODULE_DESCRIPTION("Amiga filesystem support for Linux");
565MODULE_LICENSE("GPL");
566
567module_init(init_affs_fs)
568module_exit(exit_affs_fs)
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