blob: d41e9673cd9736fae4efb1db81accbeec6c1f7eb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Jeff Garzike18fa702006-09-24 11:13:19 -040017#include <linux/magic.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040018#include <linux/sched.h>
Alessio Igor Bogani337eb002009-05-12 15:10:54 +020019#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "affs.h"
21
22extern struct timezone sys_tz;
23
David Howells726c3342006-06-23 02:02:58 -070024static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025static int affs_remount (struct super_block *sb, int *flags, char *data);
26
27static void
Christoph Hellwige2896432009-06-08 10:03:15 +020028affs_commit_super(struct super_block *sb, int clean)
29{
30 struct affs_sb_info *sbi = AFFS_SB(sb);
31 struct buffer_head *bh = sbi->s_root_bh;
32 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
33
34 tail->bm_flag = cpu_to_be32(clean);
35 secs_to_datestamp(get_seconds(), &tail->disk_change);
36 affs_fix_checksum(sb, bh);
37 mark_buffer_dirty(bh);
38}
39
40static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070041affs_put_super(struct super_block *sb)
42{
43 struct affs_sb_info *sbi = AFFS_SB(sb);
44 pr_debug("AFFS: put_super()\n");
45
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020046 lock_kernel();
47
Christoph Hellwige2896432009-06-08 10:03:15 +020048 if (!(sb->s_flags & MS_RDONLY))
49 affs_commit_super(sb, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Jesper Juhlf99d49a2005-11-07 01:01:34 -080051 kfree(sbi->s_prefix);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 affs_free_bitmap(sb);
53 affs_brelse(sbi->s_root_bh);
54 kfree(sbi);
55 sb->s_fs_info = NULL;
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020056
57 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -070058}
59
60static void
61affs_write_super(struct super_block *sb)
62{
63 int clean = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Christoph Hellwigebc1ac12009-05-11 23:35:03 +020065 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (!(sb->s_flags & MS_RDONLY)) {
67 // if (sbi->s_bitmap[i].bm_bh) {
68 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
69 // clean = 0;
Christoph Hellwige2896432009-06-08 10:03:15 +020070 affs_commit_super(sb, clean);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 sb->s_dirt = !clean; /* redo until bitmap synced */
72 } else
73 sb->s_dirt = 0;
Christoph Hellwigebc1ac12009-05-11 23:35:03 +020074 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
77}
78
Christoph Hellwige2896432009-06-08 10:03:15 +020079static int
80affs_sync_fs(struct super_block *sb, int wait)
81{
82 lock_super(sb);
83 affs_commit_super(sb, 2);
84 sb->s_dirt = 0;
85 unlock_super(sb);
86 return 0;
87}
88
Christoph Lametere18b8902006-12-06 20:33:20 -080089static struct kmem_cache * affs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91static struct inode *affs_alloc_inode(struct super_block *sb)
92{
Roman Zippeldca3c332008-04-29 17:02:20 +020093 struct affs_inode_info *i;
94
95 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
96 if (!i)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 return NULL;
Roman Zippeldca3c332008-04-29 17:02:20 +020098
99 i->vfs_inode.i_version = 1;
100 i->i_lc = NULL;
101 i->i_ext_bh = NULL;
102 i->i_pa_cnt = 0;
103
104 return &i->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
107static void affs_destroy_inode(struct inode *inode)
108{
109 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
110}
111
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700112static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
114 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
115
Christoph Lametera35afb82007-05-16 22:10:57 -0700116 init_MUTEX(&ei->i_link_lock);
117 init_MUTEX(&ei->i_ext_lock);
118 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
121static int init_inodecache(void)
122{
123 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
124 sizeof(struct affs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800125 0, (SLAB_RECLAIM_ACCOUNT|
126 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900127 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (affs_inode_cachep == NULL)
129 return -ENOMEM;
130 return 0;
131}
132
133static void destroy_inodecache(void)
134{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700135 kmem_cache_destroy(affs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800138static const struct super_operations affs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 .alloc_inode = affs_alloc_inode,
140 .destroy_inode = affs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 .write_inode = affs_write_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 .delete_inode = affs_delete_inode,
143 .clear_inode = affs_clear_inode,
144 .put_super = affs_put_super,
145 .write_super = affs_write_super,
Christoph Hellwige2896432009-06-08 10:03:15 +0200146 .sync_fs = affs_sync_fs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 .statfs = affs_statfs,
148 .remount_fs = affs_remount,
Miklos Szeredie9b39612008-02-08 04:21:36 -0800149 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150};
151
152enum {
153 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
154 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
155 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
156};
157
Steven Whitehousea447c092008-10-13 10:46:57 +0100158static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 {Opt_bs, "bs=%u"},
160 {Opt_mode, "mode=%o"},
161 {Opt_mufs, "mufs"},
162 {Opt_prefix, "prefix=%s"},
163 {Opt_protect, "protect"},
164 {Opt_reserved, "reserved=%u"},
165 {Opt_root, "root=%u"},
166 {Opt_setgid, "setgid=%u"},
167 {Opt_setuid, "setuid=%u"},
168 {Opt_verbose, "verbose"},
169 {Opt_volume, "volume=%s"},
170 {Opt_ignore, "grpquota"},
171 {Opt_ignore, "noquota"},
172 {Opt_ignore, "quota"},
173 {Opt_ignore, "usrquota"},
174 {Opt_err, NULL},
175};
176
177static int
178parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
179 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
180{
181 char *p;
182 substring_t args[MAX_OPT_ARGS];
183
184 /* Fill in defaults */
185
David Howells21559982008-11-14 10:38:45 +1100186 *uid = current_uid();
187 *gid = current_gid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 *reserved = 2;
189 *root = -1;
190 *blocksize = -1;
191 volume[0] = ':';
192 volume[1] = 0;
193 *mount_opts = 0;
194 if (!options)
195 return 1;
196
197 while ((p = strsep(&options, ",")) != NULL) {
198 int token, n, option;
199 if (!*p)
200 continue;
201
202 token = match_token(p, tokens, args);
203 switch (token) {
204 case Opt_bs:
205 if (match_int(&args[0], &n))
Al Viro217686e2010-01-24 00:06:22 -0500206 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (n != 512 && n != 1024 && n != 2048
208 && n != 4096) {
209 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
210 return 0;
211 }
212 *blocksize = n;
213 break;
214 case Opt_mode:
215 if (match_octal(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500216 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 *mode = option & 0777;
218 *mount_opts |= SF_SETMODE;
219 break;
220 case Opt_mufs:
221 *mount_opts |= SF_MUFS;
222 break;
223 case Opt_prefix:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 *prefix = match_strdup(&args[0]);
225 if (!*prefix)
226 return 0;
227 *mount_opts |= SF_PREFIX;
228 break;
229 case Opt_protect:
230 *mount_opts |= SF_IMMUTABLE;
231 break;
232 case Opt_reserved:
233 if (match_int(&args[0], reserved))
Al Viro217686e2010-01-24 00:06:22 -0500234 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 break;
236 case Opt_root:
237 if (match_int(&args[0], root))
Al Viro217686e2010-01-24 00:06:22 -0500238 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 break;
240 case Opt_setgid:
241 if (match_int(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500242 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 *gid = option;
244 *mount_opts |= SF_SETGID;
245 break;
246 case Opt_setuid:
247 if (match_int(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500248 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 *uid = option;
250 *mount_opts |= SF_SETUID;
251 break;
252 case Opt_verbose:
253 *mount_opts |= SF_VERBOSE;
254 break;
255 case Opt_volume: {
256 char *vol = match_strdup(&args[0]);
Jim Meyering6db27dd2008-04-29 00:59:06 -0700257 if (!vol)
258 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 strlcpy(volume, vol, 32);
260 kfree(vol);
261 break;
262 }
263 case Opt_ignore:
264 /* Silently ignore the quota options */
265 break;
266 default:
267 printk("AFFS: Unrecognized mount option \"%s\" "
268 "or missing value\n", p);
269 return 0;
270 }
271 }
272 return 1;
273}
274
275/* This function definitely needs to be split up. Some fine day I'll
276 * hopefully have the guts to do so. Until then: sorry for the mess.
277 */
278
279static int affs_fill_super(struct super_block *sb, void *data, int silent)
280{
281 struct affs_sb_info *sbi;
282 struct buffer_head *root_bh = NULL;
283 struct buffer_head *boot_bh;
284 struct inode *root_inode = NULL;
285 s32 root_block;
286 int size, blocksize;
287 u32 chksum;
288 int num_bm;
289 int i, j;
290 s32 key;
291 uid_t uid;
292 gid_t gid;
293 int reserved;
294 unsigned long mount_flags;
295 int tmp_flags; /* fix remount prototype... */
Al Viro2b943cf2006-06-25 05:49:08 -0700296 u8 sig[4];
David Howells210f8552008-02-07 00:15:29 -0800297 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Miklos Szeredie9b39612008-02-08 04:21:36 -0800299 save_mount_options(sb, data);
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
302
303 sb->s_magic = AFFS_SUPER_MAGIC;
304 sb->s_op = &affs_sops;
305 sb->s_flags |= MS_NODIRATIME;
306
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700307 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 if (!sbi)
309 return -ENOMEM;
310 sb->s_fs_info = sbi;
Matthias Kaehlcke7d135a52008-07-25 19:44:51 -0700311 mutex_init(&sbi->s_bmlock);
Al Viro29333922010-01-24 00:04:07 -0500312 spin_lock_init(&sbi->symlink_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
315 &blocksize,&sbi->s_prefix,
316 sbi->s_volume, &mount_flags)) {
317 printk(KERN_ERR "AFFS: Error parsing options\n");
Al Viroafc70ed2010-01-23 23:38:27 -0500318 kfree(sbi->s_prefix);
319 kfree(sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 return -EINVAL;
321 }
322 /* N.B. after this point s_prefix must be released */
323
324 sbi->s_flags = mount_flags;
325 sbi->s_mode = i;
326 sbi->s_uid = uid;
327 sbi->s_gid = gid;
328 sbi->s_reserved= reserved;
329
330 /* Get the size of the device in 512-byte blocks.
331 * If we later see that the partition uses bigger
332 * blocks, we will have to change it.
333 */
334
335 size = sb->s_bdev->bd_inode->i_size >> 9;
336 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
337
338 affs_set_blocksize(sb, PAGE_SIZE);
339 /* Try to find root block. Its location depends on the block size. */
340
341 i = 512;
342 j = 4096;
343 if (blocksize > 0) {
344 i = j = blocksize;
345 size = size / (blocksize / 512);
346 }
347 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
348 sbi->s_root_block = root_block;
349 if (root_block < 0)
350 sbi->s_root_block = (reserved + size - 1) / 2;
351 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
352 affs_set_blocksize(sb, blocksize);
353 sbi->s_partition_size = size;
354
355 /* The root block location that was calculated above is not
356 * correct if the partition size is an odd number of 512-
357 * byte blocks, which will be rounded down to a number of
358 * 1024-byte blocks, and if there were an even number of
359 * reserved blocks. Ideally, all partition checkers should
360 * report the real number of blocks of the real blocksize,
361 * but since this just cannot be done, we have to try to
362 * find the root block anyways. In the above case, it is one
363 * block behind the calculated one. So we check this one, too.
364 */
365 for (num_bm = 0; num_bm < 2; num_bm++) {
366 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
367 "size=%d, reserved=%d\n",
368 sb->s_id,
369 sbi->s_root_block + num_bm,
370 blocksize, size, reserved);
371 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
372 if (!root_bh)
373 continue;
374 if (!affs_checksum_block(sb, root_bh) &&
375 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
376 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
377 sbi->s_hashsize = blocksize / 4 - 56;
378 sbi->s_root_block += num_bm;
379 key = 1;
380 goto got_root;
381 }
382 affs_brelse(root_bh);
383 root_bh = NULL;
384 }
385 }
386 if (!silent)
387 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
388 sb->s_id);
389 goto out_error;
390
391 /* N.B. after this point bh must be released */
392got_root:
393 root_block = sbi->s_root_block;
394
395 /* Find out which kind of FS we have */
396 boot_bh = sb_bread(sb, 0);
397 if (!boot_bh) {
398 printk(KERN_ERR "AFFS: Cannot read boot block\n");
399 goto out_error;
400 }
Al Viro2b943cf2006-06-25 05:49:08 -0700401 memcpy(sig, boot_bh->b_data, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 brelse(boot_bh);
Al Viro2b943cf2006-06-25 05:49:08 -0700403 chksum = be32_to_cpu(*(__be32 *)sig);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405 /* Dircache filesystems are compatible with non-dircache ones
406 * when reading. As long as they aren't supported, writing is
407 * not recommended.
408 */
409 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
410 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
411 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
412 sb->s_id);
413 sb->s_flags |= MS_RDONLY;
414 }
415 switch (chksum) {
416 case MUFS_FS:
417 case MUFS_INTLFFS:
418 case MUFS_DCFFS:
419 sbi->s_flags |= SF_MUFS;
420 /* fall thru */
421 case FS_INTLFFS:
422 case FS_DCFFS:
423 sbi->s_flags |= SF_INTL;
424 break;
425 case MUFS_FFS:
426 sbi->s_flags |= SF_MUFS;
427 break;
428 case FS_FFS:
429 break;
430 case MUFS_OFS:
431 sbi->s_flags |= SF_MUFS;
432 /* fall thru */
433 case FS_OFS:
434 sbi->s_flags |= SF_OFS;
435 sb->s_flags |= MS_NOEXEC;
436 break;
437 case MUFS_DCOFS:
438 case MUFS_INTLOFS:
439 sbi->s_flags |= SF_MUFS;
440 case FS_DCOFS:
441 case FS_INTLOFS:
442 sbi->s_flags |= SF_INTL | SF_OFS;
443 sb->s_flags |= MS_NOEXEC;
444 break;
445 default:
446 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
447 sb->s_id, chksum);
448 goto out_error;
449 }
450
451 if (mount_flags & SF_VERBOSE) {
Al Viro2b943cf2006-06-25 05:49:08 -0700452 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
453 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
454 len > 31 ? 31 : len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
Al Viro2b943cf2006-06-25 05:49:08 -0700456 sig, sig[3] + '0', blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 }
458
459 sb->s_flags |= MS_NODEV | MS_NOSUID;
460
461 sbi->s_data_blksize = sb->s_blocksize;
462 if (sbi->s_flags & SF_OFS)
463 sbi->s_data_blksize -= 24;
464
465 /* Keep super block in cache */
466 sbi->s_root_bh = root_bh;
467 /* N.B. after this point s_root_bh must be released */
468
469 tmp_flags = sb->s_flags;
470 if (affs_init_bitmap(sb, &tmp_flags))
471 goto out_error;
472 sb->s_flags = tmp_flags;
473
474 /* set up enough so that it can read an inode */
475
David Howells210f8552008-02-07 00:15:29 -0800476 root_inode = affs_iget(sb, root_block);
477 if (IS_ERR(root_inode)) {
478 ret = PTR_ERR(root_inode);
479 goto out_error_noinode;
480 }
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 sb->s_root = d_alloc_root(root_inode);
483 if (!sb->s_root) {
484 printk(KERN_ERR "AFFS: Get root inode failed\n");
485 goto out_error;
486 }
487 sb->s_root->d_op = &affs_dentry_operations;
488
489 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
490 return 0;
491
492 /*
493 * Begin the cascaded cleanup ...
494 */
495out_error:
496 if (root_inode)
497 iput(root_inode);
David Howells210f8552008-02-07 00:15:29 -0800498out_error_noinode:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800499 kfree(sbi->s_bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 affs_brelse(root_bh);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800501 kfree(sbi->s_prefix);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 kfree(sbi);
503 sb->s_fs_info = NULL;
David Howells210f8552008-02-07 00:15:29 -0800504 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505}
506
507static int
508affs_remount(struct super_block *sb, int *flags, char *data)
509{
510 struct affs_sb_info *sbi = AFFS_SB(sb);
511 int blocksize;
512 uid_t uid;
513 gid_t gid;
514 int mode;
515 int reserved;
516 int root_block;
517 unsigned long mount_flags;
518 int res = 0;
Miklos Szeredie9b39612008-02-08 04:21:36 -0800519 char *new_opts = kstrdup(data, GFP_KERNEL);
Al Viro29333922010-01-24 00:04:07 -0500520 char volume[32];
521 char *prefix = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
524
525 *flags |= MS_NODIRATIME;
526
Al Viro29333922010-01-24 00:04:07 -0500527 memcpy(volume, sbi->s_volume, 32);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800528 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
Al Viro29333922010-01-24 00:04:07 -0500529 &blocksize, &prefix, volume,
Miklos Szeredie9b39612008-02-08 04:21:36 -0800530 &mount_flags)) {
Al Viro29333922010-01-24 00:04:07 -0500531 kfree(prefix);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800532 kfree(new_opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 return -EINVAL;
Miklos Szeredie9b39612008-02-08 04:21:36 -0800534 }
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200535 lock_kernel();
Al Viro2a32ceb2009-05-08 16:05:57 -0400536 replace_mount_options(sb, new_opts);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 sbi->s_flags = mount_flags;
539 sbi->s_mode = mode;
540 sbi->s_uid = uid;
541 sbi->s_gid = gid;
Al Viro29333922010-01-24 00:04:07 -0500542 /* protect against readers */
543 spin_lock(&sbi->symlink_lock);
544 if (prefix) {
545 kfree(sbi->s_prefix);
546 sbi->s_prefix = prefix;
547 }
548 memcpy(sbi->s_volume, volume, 32);
549 spin_unlock(&sbi->symlink_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200551 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
552 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 return 0;
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200554 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if (*flags & MS_RDONLY) {
556 sb->s_dirt = 1;
557 while (sb->s_dirt)
558 affs_write_super(sb);
559 affs_free_bitmap(sb);
560 } else
561 res = affs_init_bitmap(sb, flags);
562
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200563 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 return res;
565}
566
567static int
David Howells726c3342006-06-23 02:02:58 -0700568affs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
David Howells726c3342006-06-23 02:02:58 -0700570 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 int free;
Coly Lia6a2a732009-04-02 16:59:32 -0700572 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
575 AFFS_SB(sb)->s_reserved);
576
577 free = affs_count_free_blocks(sb);
578 buf->f_type = AFFS_SUPER_MAGIC;
579 buf->f_bsize = sb->s_blocksize;
580 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
581 buf->f_bfree = free;
582 buf->f_bavail = free;
Coly Lia6a2a732009-04-02 16:59:32 -0700583 buf->f_fsid.val[0] = (u32)id;
584 buf->f_fsid.val[1] = (u32)(id >> 32);
585 buf->f_namelen = 30;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 return 0;
587}
588
David Howells454e2392006-06-23 02:02:57 -0700589static int affs_get_sb(struct file_system_type *fs_type,
590 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
David Howells454e2392006-06-23 02:02:57 -0700592 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
593 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
596static struct file_system_type affs_fs_type = {
597 .owner = THIS_MODULE,
598 .name = "affs",
599 .get_sb = affs_get_sb,
600 .kill_sb = kill_block_super,
601 .fs_flags = FS_REQUIRES_DEV,
602};
603
604static int __init init_affs_fs(void)
605{
606 int err = init_inodecache();
607 if (err)
608 goto out1;
609 err = register_filesystem(&affs_fs_type);
610 if (err)
611 goto out;
612 return 0;
613out:
614 destroy_inodecache();
615out1:
616 return err;
617}
618
619static void __exit exit_affs_fs(void)
620{
621 unregister_filesystem(&affs_fs_type);
622 destroy_inodecache();
623}
624
625MODULE_DESCRIPTION("Amiga filesystem support for Linux");
626MODULE_LICENSE("GPL");
627
628module_init(init_affs_fs)
629module_exit(exit_affs_fs)