blob: c70f1e5fc0247a616d44e60c2681bbf8fc14c747 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Artem Bityutskiy3dd84782012-06-06 18:56:57 +030020#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "affs.h"
22
23extern struct timezone sys_tz;
24
David Howells726c3342006-06-23 02:02:58 -070025static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070026static int affs_remount (struct super_block *sb, int *flags, char *data);
27
28static void
Artem Bityutskiybc862562012-06-06 18:56:51 +030029affs_commit_super(struct super_block *sb, int wait)
Christoph Hellwige2896432009-06-08 10:03:15 +020030{
31 struct affs_sb_info *sbi = AFFS_SB(sb);
32 struct buffer_head *bh = sbi->s_root_bh;
33 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
34
Artem Bityutskiya8371072012-06-06 18:56:55 +030035 lock_buffer(bh);
Christoph Hellwige2896432009-06-08 10:03:15 +020036 secs_to_datestamp(get_seconds(), &tail->disk_change);
37 affs_fix_checksum(sb, bh);
Artem Bityutskiya8371072012-06-06 18:56:55 +030038 unlock_buffer(bh);
39
Christoph Hellwige2896432009-06-08 10:03:15 +020040 mark_buffer_dirty(bh);
Artem Bityutskiy7435d502010-07-05 15:15:00 +030041 if (wait)
42 sync_dirty_buffer(bh);
Christoph Hellwige2896432009-06-08 10:03:15 +020043}
44
45static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070046affs_put_super(struct super_block *sb)
47{
48 struct affs_sb_info *sbi = AFFS_SB(sb);
49 pr_debug("AFFS: put_super()\n");
50
Artem Bityutskiy3dd84782012-06-06 18:56:57 +030051 cancel_delayed_work_sync(&sbi->sb_work);
Jesper Juhlf99d49a2005-11-07 01:01:34 -080052 kfree(sbi->s_prefix);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 affs_free_bitmap(sb);
54 affs_brelse(sbi->s_root_bh);
55 kfree(sbi);
56 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057}
58
Christoph Hellwige2896432009-06-08 10:03:15 +020059static int
60affs_sync_fs(struct super_block *sb, int wait)
61{
Artem Bityutskiybc862562012-06-06 18:56:51 +030062 affs_commit_super(sb, wait);
Christoph Hellwige2896432009-06-08 10:03:15 +020063 return 0;
64}
65
Artem Bityutskiy3dd84782012-06-06 18:56:57 +030066static void flush_superblock(struct work_struct *work)
67{
68 struct affs_sb_info *sbi;
69 struct super_block *sb;
70
71 sbi = container_of(work, struct affs_sb_info, sb_work.work);
72 sb = sbi->sb;
73
74 spin_lock(&sbi->work_lock);
75 sbi->work_queued = 0;
76 spin_unlock(&sbi->work_lock);
77
78 affs_commit_super(sb, 1);
79}
80
81void affs_mark_sb_dirty(struct super_block *sb)
82{
83 struct affs_sb_info *sbi = AFFS_SB(sb);
84 unsigned long delay;
85
86 if (sb->s_flags & MS_RDONLY)
87 return;
88
89 spin_lock(&sbi->work_lock);
90 if (!sbi->work_queued) {
91 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
92 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
93 sbi->work_queued = 1;
94 }
95 spin_unlock(&sbi->work_lock);
96}
97
Christoph Lametere18b8902006-12-06 20:33:20 -080098static struct kmem_cache * affs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100static struct inode *affs_alloc_inode(struct super_block *sb)
101{
Roman Zippeldca3c332008-04-29 17:02:20 +0200102 struct affs_inode_info *i;
103
104 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
105 if (!i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return NULL;
Roman Zippeldca3c332008-04-29 17:02:20 +0200107
108 i->vfs_inode.i_version = 1;
109 i->i_lc = NULL;
110 i->i_ext_bh = NULL;
111 i->i_pa_cnt = 0;
112
113 return &i->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100116static void affs_i_callback(struct rcu_head *head)
117{
118 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100119 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
120}
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122static void affs_destroy_inode(struct inode *inode)
123{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100124 call_rcu(&inode->i_rcu, affs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700127static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
129 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
130
Thomas Gleixner756b0322010-09-07 14:33:11 +0000131 sema_init(&ei->i_link_lock, 1);
132 sema_init(&ei->i_ext_lock, 1);
Christoph Lametera35afb82007-05-16 22:10:57 -0700133 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
136static int init_inodecache(void)
137{
138 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
139 sizeof(struct affs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800140 0, (SLAB_RECLAIM_ACCOUNT|
141 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900142 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 if (affs_inode_cachep == NULL)
144 return -ENOMEM;
145 return 0;
146}
147
148static void destroy_inodecache(void)
149{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700150 kmem_cache_destroy(affs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800153static const struct super_operations affs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 .alloc_inode = affs_alloc_inode,
155 .destroy_inode = affs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 .write_inode = affs_write_inode,
Al Virof053ddd2010-06-06 10:16:41 -0400157 .evict_inode = affs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 .put_super = affs_put_super,
Christoph Hellwige2896432009-06-08 10:03:15 +0200159 .sync_fs = affs_sync_fs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 .statfs = affs_statfs,
161 .remount_fs = affs_remount,
Miklos Szeredie9b39612008-02-08 04:21:36 -0800162 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163};
164
165enum {
166 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
167 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
168 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
169};
170
Steven Whitehousea447c092008-10-13 10:46:57 +0100171static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 {Opt_bs, "bs=%u"},
173 {Opt_mode, "mode=%o"},
174 {Opt_mufs, "mufs"},
175 {Opt_prefix, "prefix=%s"},
176 {Opt_protect, "protect"},
177 {Opt_reserved, "reserved=%u"},
178 {Opt_root, "root=%u"},
179 {Opt_setgid, "setgid=%u"},
180 {Opt_setuid, "setuid=%u"},
181 {Opt_verbose, "verbose"},
182 {Opt_volume, "volume=%s"},
183 {Opt_ignore, "grpquota"},
184 {Opt_ignore, "noquota"},
185 {Opt_ignore, "quota"},
186 {Opt_ignore, "usrquota"},
187 {Opt_err, NULL},
188};
189
190static int
191parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
192 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
193{
194 char *p;
195 substring_t args[MAX_OPT_ARGS];
196
197 /* Fill in defaults */
198
David Howells21559982008-11-14 10:38:45 +1100199 *uid = current_uid();
200 *gid = current_gid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 *reserved = 2;
202 *root = -1;
203 *blocksize = -1;
204 volume[0] = ':';
205 volume[1] = 0;
206 *mount_opts = 0;
207 if (!options)
208 return 1;
209
210 while ((p = strsep(&options, ",")) != NULL) {
211 int token, n, option;
212 if (!*p)
213 continue;
214
215 token = match_token(p, tokens, args);
216 switch (token) {
217 case Opt_bs:
218 if (match_int(&args[0], &n))
Al Viro217686e2010-01-24 00:06:22 -0500219 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 if (n != 512 && n != 1024 && n != 2048
221 && n != 4096) {
222 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
223 return 0;
224 }
225 *blocksize = n;
226 break;
227 case Opt_mode:
228 if (match_octal(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500229 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 *mode = option & 0777;
231 *mount_opts |= SF_SETMODE;
232 break;
233 case Opt_mufs:
234 *mount_opts |= SF_MUFS;
235 break;
236 case Opt_prefix:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 *prefix = match_strdup(&args[0]);
238 if (!*prefix)
239 return 0;
240 *mount_opts |= SF_PREFIX;
241 break;
242 case Opt_protect:
243 *mount_opts |= SF_IMMUTABLE;
244 break;
245 case Opt_reserved:
246 if (match_int(&args[0], reserved))
Al Viro217686e2010-01-24 00:06:22 -0500247 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 break;
249 case Opt_root:
250 if (match_int(&args[0], root))
Al Viro217686e2010-01-24 00:06:22 -0500251 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 break;
253 case Opt_setgid:
254 if (match_int(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500255 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 *gid = option;
257 *mount_opts |= SF_SETGID;
258 break;
259 case Opt_setuid:
260 if (match_int(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500261 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 *uid = option;
263 *mount_opts |= SF_SETUID;
264 break;
265 case Opt_verbose:
266 *mount_opts |= SF_VERBOSE;
267 break;
268 case Opt_volume: {
269 char *vol = match_strdup(&args[0]);
Jim Meyering6db27dd2008-04-29 00:59:06 -0700270 if (!vol)
271 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 strlcpy(volume, vol, 32);
273 kfree(vol);
274 break;
275 }
276 case Opt_ignore:
277 /* Silently ignore the quota options */
278 break;
279 default:
280 printk("AFFS: Unrecognized mount option \"%s\" "
281 "or missing value\n", p);
282 return 0;
283 }
284 }
285 return 1;
286}
287
288/* This function definitely needs to be split up. Some fine day I'll
289 * hopefully have the guts to do so. Until then: sorry for the mess.
290 */
291
292static int affs_fill_super(struct super_block *sb, void *data, int silent)
293{
294 struct affs_sb_info *sbi;
295 struct buffer_head *root_bh = NULL;
296 struct buffer_head *boot_bh;
297 struct inode *root_inode = NULL;
298 s32 root_block;
299 int size, blocksize;
300 u32 chksum;
301 int num_bm;
302 int i, j;
303 s32 key;
304 uid_t uid;
305 gid_t gid;
306 int reserved;
307 unsigned long mount_flags;
308 int tmp_flags; /* fix remount prototype... */
Al Viro2b943cf2006-06-25 05:49:08 -0700309 u8 sig[4];
David Howells210f8552008-02-07 00:15:29 -0800310 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Miklos Szeredie9b39612008-02-08 04:21:36 -0800312 save_mount_options(sb, data);
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
315
316 sb->s_magic = AFFS_SUPER_MAGIC;
317 sb->s_op = &affs_sops;
318 sb->s_flags |= MS_NODIRATIME;
319
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700320 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 if (!sbi)
322 return -ENOMEM;
Jan Blunck74c41422010-08-15 22:52:36 +0200323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 sb->s_fs_info = sbi;
Artem Bityutskiya215fef2012-06-06 18:56:56 +0300325 sbi->sb = sb;
Matthias Kaehlcke7d135a52008-07-25 19:44:51 -0700326 mutex_init(&sbi->s_bmlock);
Al Viro29333922010-01-24 00:04:07 -0500327 spin_lock_init(&sbi->symlink_lock);
Artem Bityutskiy3dd84782012-06-06 18:56:57 +0300328 spin_lock_init(&sbi->work_lock);
329 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
332 &blocksize,&sbi->s_prefix,
333 sbi->s_volume, &mount_flags)) {
334 printk(KERN_ERR "AFFS: Error parsing options\n");
Al Viroafc70ed2010-01-23 23:38:27 -0500335 kfree(sbi->s_prefix);
336 kfree(sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 return -EINVAL;
338 }
339 /* N.B. after this point s_prefix must be released */
340
341 sbi->s_flags = mount_flags;
342 sbi->s_mode = i;
343 sbi->s_uid = uid;
344 sbi->s_gid = gid;
345 sbi->s_reserved= reserved;
346
347 /* Get the size of the device in 512-byte blocks.
348 * If we later see that the partition uses bigger
349 * blocks, we will have to change it.
350 */
351
352 size = sb->s_bdev->bd_inode->i_size >> 9;
353 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
354
355 affs_set_blocksize(sb, PAGE_SIZE);
356 /* Try to find root block. Its location depends on the block size. */
357
358 i = 512;
359 j = 4096;
360 if (blocksize > 0) {
361 i = j = blocksize;
362 size = size / (blocksize / 512);
363 }
364 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
365 sbi->s_root_block = root_block;
366 if (root_block < 0)
367 sbi->s_root_block = (reserved + size - 1) / 2;
368 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
369 affs_set_blocksize(sb, blocksize);
370 sbi->s_partition_size = size;
371
372 /* The root block location that was calculated above is not
373 * correct if the partition size is an odd number of 512-
374 * byte blocks, which will be rounded down to a number of
375 * 1024-byte blocks, and if there were an even number of
376 * reserved blocks. Ideally, all partition checkers should
377 * report the real number of blocks of the real blocksize,
378 * but since this just cannot be done, we have to try to
379 * find the root block anyways. In the above case, it is one
380 * block behind the calculated one. So we check this one, too.
381 */
382 for (num_bm = 0; num_bm < 2; num_bm++) {
383 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
384 "size=%d, reserved=%d\n",
385 sb->s_id,
386 sbi->s_root_block + num_bm,
387 blocksize, size, reserved);
388 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
389 if (!root_bh)
390 continue;
391 if (!affs_checksum_block(sb, root_bh) &&
392 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
393 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
394 sbi->s_hashsize = blocksize / 4 - 56;
395 sbi->s_root_block += num_bm;
396 key = 1;
397 goto got_root;
398 }
399 affs_brelse(root_bh);
400 root_bh = NULL;
401 }
402 }
403 if (!silent)
404 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
405 sb->s_id);
406 goto out_error;
407
408 /* N.B. after this point bh must be released */
409got_root:
410 root_block = sbi->s_root_block;
411
412 /* Find out which kind of FS we have */
413 boot_bh = sb_bread(sb, 0);
414 if (!boot_bh) {
415 printk(KERN_ERR "AFFS: Cannot read boot block\n");
416 goto out_error;
417 }
Al Viro2b943cf2006-06-25 05:49:08 -0700418 memcpy(sig, boot_bh->b_data, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 brelse(boot_bh);
Al Viro2b943cf2006-06-25 05:49:08 -0700420 chksum = be32_to_cpu(*(__be32 *)sig);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 /* Dircache filesystems are compatible with non-dircache ones
423 * when reading. As long as they aren't supported, writing is
424 * not recommended.
425 */
426 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
427 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
428 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
429 sb->s_id);
430 sb->s_flags |= MS_RDONLY;
431 }
432 switch (chksum) {
433 case MUFS_FS:
434 case MUFS_INTLFFS:
435 case MUFS_DCFFS:
436 sbi->s_flags |= SF_MUFS;
437 /* fall thru */
438 case FS_INTLFFS:
439 case FS_DCFFS:
440 sbi->s_flags |= SF_INTL;
441 break;
442 case MUFS_FFS:
443 sbi->s_flags |= SF_MUFS;
444 break;
445 case FS_FFS:
446 break;
447 case MUFS_OFS:
448 sbi->s_flags |= SF_MUFS;
449 /* fall thru */
450 case FS_OFS:
451 sbi->s_flags |= SF_OFS;
452 sb->s_flags |= MS_NOEXEC;
453 break;
454 case MUFS_DCOFS:
455 case MUFS_INTLOFS:
456 sbi->s_flags |= SF_MUFS;
457 case FS_DCOFS:
458 case FS_INTLOFS:
459 sbi->s_flags |= SF_INTL | SF_OFS;
460 sb->s_flags |= MS_NOEXEC;
461 break;
462 default:
463 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
464 sb->s_id, chksum);
465 goto out_error;
466 }
467
468 if (mount_flags & SF_VERBOSE) {
Al Viro2b943cf2006-06-25 05:49:08 -0700469 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
470 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
471 len > 31 ? 31 : len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
Al Viro2b943cf2006-06-25 05:49:08 -0700473 sig, sig[3] + '0', blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 }
475
476 sb->s_flags |= MS_NODEV | MS_NOSUID;
477
478 sbi->s_data_blksize = sb->s_blocksize;
479 if (sbi->s_flags & SF_OFS)
480 sbi->s_data_blksize -= 24;
481
482 /* Keep super block in cache */
483 sbi->s_root_bh = root_bh;
484 /* N.B. after this point s_root_bh must be released */
485
486 tmp_flags = sb->s_flags;
487 if (affs_init_bitmap(sb, &tmp_flags))
488 goto out_error;
489 sb->s_flags = tmp_flags;
490
491 /* set up enough so that it can read an inode */
492
David Howells210f8552008-02-07 00:15:29 -0800493 root_inode = affs_iget(sb, root_block);
494 if (IS_ERR(root_inode)) {
495 ret = PTR_ERR(root_inode);
Al Viro48fde702012-01-08 22:15:13 -0500496 goto out_error;
David Howells210f8552008-02-07 00:15:29 -0800497 }
498
Al Viroa1298802011-01-12 16:45:19 -0500499 if (AFFS_SB(sb)->s_flags & SF_INTL)
500 sb->s_d_op = &affs_intl_dentry_operations;
501 else
502 sb->s_d_op = &affs_dentry_operations;
503
Al Viro48fde702012-01-08 22:15:13 -0500504 sb->s_root = d_make_root(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (!sb->s_root) {
506 printk(KERN_ERR "AFFS: Get root inode failed\n");
507 goto out_error;
508 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
511 return 0;
512
513 /*
514 * Begin the cascaded cleanup ...
515 */
516out_error:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800517 kfree(sbi->s_bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 affs_brelse(root_bh);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800519 kfree(sbi->s_prefix);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 kfree(sbi);
521 sb->s_fs_info = NULL;
David Howells210f8552008-02-07 00:15:29 -0800522 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
525static int
526affs_remount(struct super_block *sb, int *flags, char *data)
527{
528 struct affs_sb_info *sbi = AFFS_SB(sb);
529 int blocksize;
530 uid_t uid;
531 gid_t gid;
532 int mode;
533 int reserved;
534 int root_block;
535 unsigned long mount_flags;
536 int res = 0;
Miklos Szeredie9b39612008-02-08 04:21:36 -0800537 char *new_opts = kstrdup(data, GFP_KERNEL);
Al Viro29333922010-01-24 00:04:07 -0500538 char volume[32];
539 char *prefix = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
542
543 *flags |= MS_NODIRATIME;
544
Al Viro29333922010-01-24 00:04:07 -0500545 memcpy(volume, sbi->s_volume, 32);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800546 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
Al Viro29333922010-01-24 00:04:07 -0500547 &blocksize, &prefix, volume,
Miklos Szeredie9b39612008-02-08 04:21:36 -0800548 &mount_flags)) {
Al Viro29333922010-01-24 00:04:07 -0500549 kfree(prefix);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800550 kfree(new_opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return -EINVAL;
Miklos Szeredie9b39612008-02-08 04:21:36 -0800552 }
Jan Blunck74c41422010-08-15 22:52:36 +0200553
Artem Bityutskiy3dd84782012-06-06 18:56:57 +0300554 flush_delayed_work_sync(&sbi->sb_work);
Al Viro2a32ceb2009-05-08 16:05:57 -0400555 replace_mount_options(sb, new_opts);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800556
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 sbi->s_flags = mount_flags;
558 sbi->s_mode = mode;
559 sbi->s_uid = uid;
560 sbi->s_gid = gid;
Al Viro29333922010-01-24 00:04:07 -0500561 /* protect against readers */
562 spin_lock(&sbi->symlink_lock);
563 if (prefix) {
564 kfree(sbi->s_prefix);
565 sbi->s_prefix = prefix;
566 }
567 memcpy(sbi->s_volume, volume, 32);
568 spin_unlock(&sbi->symlink_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Jan Blunck74c41422010-08-15 22:52:36 +0200570 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return 0;
Jan Blunck74c41422010-08-15 22:52:36 +0200572
Artem Bityutskiy0164b1a2012-06-06 18:56:53 +0300573 if (*flags & MS_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 affs_free_bitmap(sb);
Artem Bityutskiy0164b1a2012-06-06 18:56:53 +0300575 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 res = affs_init_bitmap(sb, flags);
577
578 return res;
579}
580
581static int
David Howells726c3342006-06-23 02:02:58 -0700582affs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583{
David Howells726c3342006-06-23 02:02:58 -0700584 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 int free;
Coly Lia6a2a732009-04-02 16:59:32 -0700586 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
589 AFFS_SB(sb)->s_reserved);
590
591 free = affs_count_free_blocks(sb);
592 buf->f_type = AFFS_SUPER_MAGIC;
593 buf->f_bsize = sb->s_blocksize;
594 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
595 buf->f_bfree = free;
596 buf->f_bavail = free;
Coly Lia6a2a732009-04-02 16:59:32 -0700597 buf->f_fsid.val[0] = (u32)id;
598 buf->f_fsid.val[1] = (u32)(id >> 32);
599 buf->f_namelen = 30;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 return 0;
601}
602
Al Viro152a0832010-07-25 00:46:55 +0400603static struct dentry *affs_mount(struct file_system_type *fs_type,
604 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
Al Viro152a0832010-07-25 00:46:55 +0400606 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607}
608
609static struct file_system_type affs_fs_type = {
610 .owner = THIS_MODULE,
611 .name = "affs",
Al Viro152a0832010-07-25 00:46:55 +0400612 .mount = affs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 .kill_sb = kill_block_super,
614 .fs_flags = FS_REQUIRES_DEV,
615};
616
617static int __init init_affs_fs(void)
618{
619 int err = init_inodecache();
620 if (err)
621 goto out1;
622 err = register_filesystem(&affs_fs_type);
623 if (err)
624 goto out;
625 return 0;
626out:
627 destroy_inodecache();
628out1:
629 return err;
630}
631
632static void __exit exit_affs_fs(void)
633{
634 unregister_filesystem(&affs_fs_type);
635 destroy_inodecache();
636}
637
638MODULE_DESCRIPTION("Amiga filesystem support for Linux");
639MODULE_LICENSE("GPL");
640
641module_init(init_affs_fs)
642module_exit(exit_affs_fs)