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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>
Ingo Molnar5b825c32017-02-02 17:54:15 +010019#include <linux/cred.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Artem Bityutskiy3dd84782012-06-06 18:56:57 +030021#include <linux/writeback.h>
Pranay Kr. Srivastavae852d822015-09-09 15:39:09 -070022#include <linux/blkdev.h>
David Howells26a76552017-07-05 16:25:16 +010023#include <linux/seq_file.h>
Jeff Layton9dffe562017-12-11 06:35:10 -050024#include <linux/iversion.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "affs.h"
26
David Howells726c3342006-06-23 02:02:58 -070027static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
David Howells26a76552017-07-05 16:25:16 +010028static int affs_show_options(struct seq_file *m, struct dentry *root);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static int affs_remount (struct super_block *sb, int *flags, char *data);
30
31static void
Artem Bityutskiybc862562012-06-06 18:56:51 +030032affs_commit_super(struct super_block *sb, int wait)
Christoph Hellwige2896432009-06-08 10:03:15 +020033{
34 struct affs_sb_info *sbi = AFFS_SB(sb);
35 struct buffer_head *bh = sbi->s_root_bh;
36 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
37
Artem Bityutskiya8371072012-06-06 18:56:55 +030038 lock_buffer(bh);
Fabian Frederickc1618202017-02-27 14:27:54 -080039 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
Christoph Hellwige2896432009-06-08 10:03:15 +020040 affs_fix_checksum(sb, bh);
Artem Bityutskiya8371072012-06-06 18:56:55 +030041 unlock_buffer(bh);
42
Christoph Hellwige2896432009-06-08 10:03:15 +020043 mark_buffer_dirty(bh);
Artem Bityutskiy7435d502010-07-05 15:15:00 +030044 if (wait)
45 sync_dirty_buffer(bh);
Christoph Hellwige2896432009-06-08 10:03:15 +020046}
47
48static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070049affs_put_super(struct super_block *sb)
50{
51 struct affs_sb_info *sbi = AFFS_SB(sb);
Fabian Frederick9606d9a2014-06-06 14:37:25 -070052 pr_debug("%s()\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Artem Bityutskiy3dd84782012-06-06 18:56:57 +030054 cancel_delayed_work_sync(&sbi->sb_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
Christoph Hellwige2896432009-06-08 10:03:15 +020057static int
58affs_sync_fs(struct super_block *sb, int wait)
59{
Artem Bityutskiybc862562012-06-06 18:56:51 +030060 affs_commit_super(sb, wait);
Christoph Hellwige2896432009-06-08 10:03:15 +020061 return 0;
62}
63
Artem Bityutskiy3dd84782012-06-06 18:56:57 +030064static void flush_superblock(struct work_struct *work)
65{
66 struct affs_sb_info *sbi;
67 struct super_block *sb;
68
69 sbi = container_of(work, struct affs_sb_info, sb_work.work);
70 sb = sbi->sb;
71
72 spin_lock(&sbi->work_lock);
73 sbi->work_queued = 0;
74 spin_unlock(&sbi->work_lock);
75
76 affs_commit_super(sb, 1);
77}
78
79void affs_mark_sb_dirty(struct super_block *sb)
80{
81 struct affs_sb_info *sbi = AFFS_SB(sb);
82 unsigned long delay;
83
David Howellsbc98a422017-07-17 08:45:34 +010084 if (sb_rdonly(sb))
Artem Bityutskiy3dd84782012-06-06 18:56:57 +030085 return;
86
87 spin_lock(&sbi->work_lock);
88 if (!sbi->work_queued) {
89 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
90 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
91 sbi->work_queued = 1;
92 }
93 spin_unlock(&sbi->work_lock);
94}
95
Christoph Lametere18b8902006-12-06 20:33:20 -080096static struct kmem_cache * affs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98static struct inode *affs_alloc_inode(struct super_block *sb)
99{
Roman Zippeldca3c332008-04-29 17:02:20 +0200100 struct affs_inode_info *i;
101
102 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103 if (!i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return NULL;
Roman Zippeldca3c332008-04-29 17:02:20 +0200105
Jeff Layton9dffe562017-12-11 06:35:10 -0500106 inode_set_iversion(&i->vfs_inode, 1);
Roman Zippeldca3c332008-04-29 17:02:20 +0200107 i->i_lc = NULL;
108 i->i_ext_bh = NULL;
109 i->i_pa_cnt = 0;
110
111 return &i->vfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100114static void affs_i_callback(struct rcu_head *head)
115{
116 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100117 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118}
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120static void affs_destroy_inode(struct inode *inode)
121{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100122 call_rcu(&inode->i_rcu, affs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700125static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
127 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
128
Thomas Gleixner756b0322010-09-07 14:33:11 +0000129 sema_init(&ei->i_link_lock, 1);
130 sema_init(&ei->i_ext_lock, 1);
Christoph Lametera35afb82007-05-16 22:10:57 -0700131 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
Fabian Frederickadbd3192014-04-07 15:38:59 -0700134static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
137 sizeof(struct affs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800138 0, (SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -0800139 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +0900140 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (affs_inode_cachep == NULL)
142 return -ENOMEM;
143 return 0;
144}
145
146static void destroy_inodecache(void)
147{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000148 /*
149 * Make sure all delayed rcu free inodes are flushed before we
150 * destroy cache.
151 */
152 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700153 kmem_cache_destroy(affs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800156static const struct super_operations affs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 .alloc_inode = affs_alloc_inode,
158 .destroy_inode = affs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 .write_inode = affs_write_inode,
Al Virof053ddd2010-06-06 10:16:41 -0400160 .evict_inode = affs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 .put_super = affs_put_super,
Christoph Hellwige2896432009-06-08 10:03:15 +0200162 .sync_fs = affs_sync_fs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 .statfs = affs_statfs,
164 .remount_fs = affs_remount,
David Howells26a76552017-07-05 16:25:16 +0100165 .show_options = affs_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166};
167
168enum {
Fabian Frederick8ca57722014-04-07 15:39:01 -0700169 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
171 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
172};
173
Steven Whitehousea447c092008-10-13 10:46:57 +0100174static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 {Opt_bs, "bs=%u"},
176 {Opt_mode, "mode=%o"},
177 {Opt_mufs, "mufs"},
Fabian Frederick8ca57722014-04-07 15:39:01 -0700178 {Opt_notruncate, "nofilenametruncate"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 {Opt_prefix, "prefix=%s"},
180 {Opt_protect, "protect"},
181 {Opt_reserved, "reserved=%u"},
182 {Opt_root, "root=%u"},
183 {Opt_setgid, "setgid=%u"},
184 {Opt_setuid, "setuid=%u"},
185 {Opt_verbose, "verbose"},
186 {Opt_volume, "volume=%s"},
187 {Opt_ignore, "grpquota"},
188 {Opt_ignore, "noquota"},
189 {Opt_ignore, "quota"},
190 {Opt_ignore, "usrquota"},
191 {Opt_err, NULL},
192};
193
194static int
Eric W. Biederman8fed10b2012-02-07 16:20:16 -0800195parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
197{
198 char *p;
199 substring_t args[MAX_OPT_ARGS];
200
201 /* Fill in defaults */
202
David Howells21559982008-11-14 10:38:45 +1100203 *uid = current_uid();
204 *gid = current_gid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 *reserved = 2;
206 *root = -1;
207 *blocksize = -1;
208 volume[0] = ':';
209 volume[1] = 0;
210 *mount_opts = 0;
211 if (!options)
212 return 1;
213
214 while ((p = strsep(&options, ",")) != NULL) {
215 int token, n, option;
216 if (!*p)
217 continue;
218
219 token = match_token(p, tokens, args);
220 switch (token) {
221 case Opt_bs:
222 if (match_int(&args[0], &n))
Al Viro217686e2010-01-24 00:06:22 -0500223 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 if (n != 512 && n != 1024 && n != 2048
225 && n != 4096) {
Fabian Frederick0158de12014-06-06 14:37:24 -0700226 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return 0;
228 }
229 *blocksize = n;
230 break;
231 case Opt_mode:
232 if (match_octal(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500233 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 *mode = option & 0777;
Fabian Frederick34f24832015-04-16 12:48:21 -0700235 affs_set_opt(*mount_opts, SF_SETMODE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 break;
237 case Opt_mufs:
Fabian Frederick34f24832015-04-16 12:48:21 -0700238 affs_set_opt(*mount_opts, SF_MUFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 break;
Fabian Frederick8ca57722014-04-07 15:39:01 -0700240 case Opt_notruncate:
Fabian Frederick34f24832015-04-16 12:48:21 -0700241 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
Fabian Frederick8ca57722014-04-07 15:39:01 -0700242 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 case Opt_prefix:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 *prefix = match_strdup(&args[0]);
245 if (!*prefix)
246 return 0;
Fabian Frederick34f24832015-04-16 12:48:21 -0700247 affs_set_opt(*mount_opts, SF_PREFIX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 break;
249 case Opt_protect:
Fabian Frederick34f24832015-04-16 12:48:21 -0700250 affs_set_opt(*mount_opts, SF_IMMUTABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 break;
252 case Opt_reserved:
253 if (match_int(&args[0], reserved))
Al Viro217686e2010-01-24 00:06:22 -0500254 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 break;
256 case Opt_root:
257 if (match_int(&args[0], root))
Al Viro217686e2010-01-24 00:06:22 -0500258 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 break;
260 case Opt_setgid:
261 if (match_int(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500262 return 0;
Eric W. Biederman8fed10b2012-02-07 16:20:16 -0800263 *gid = make_kgid(current_user_ns(), option);
264 if (!gid_valid(*gid))
265 return 0;
Fabian Frederick34f24832015-04-16 12:48:21 -0700266 affs_set_opt(*mount_opts, SF_SETGID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 break;
268 case Opt_setuid:
269 if (match_int(&args[0], &option))
Al Viro217686e2010-01-24 00:06:22 -0500270 return 0;
Eric W. Biederman8fed10b2012-02-07 16:20:16 -0800271 *uid = make_kuid(current_user_ns(), option);
272 if (!uid_valid(*uid))
273 return 0;
Fabian Frederick34f24832015-04-16 12:48:21 -0700274 affs_set_opt(*mount_opts, SF_SETUID);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 break;
276 case Opt_verbose:
Fabian Frederick34f24832015-04-16 12:48:21 -0700277 affs_set_opt(*mount_opts, SF_VERBOSE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 break;
279 case Opt_volume: {
280 char *vol = match_strdup(&args[0]);
Jim Meyering6db27dd2008-04-29 00:59:06 -0700281 if (!vol)
282 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 strlcpy(volume, vol, 32);
284 kfree(vol);
285 break;
286 }
287 case Opt_ignore:
288 /* Silently ignore the quota options */
289 break;
290 default:
Fabian Frederick0158de12014-06-06 14:37:24 -0700291 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
292 p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 return 0;
294 }
295 }
296 return 1;
297}
298
David Howells26a76552017-07-05 16:25:16 +0100299static int affs_show_options(struct seq_file *m, struct dentry *root)
300{
301 struct super_block *sb = root->d_sb;
302 struct affs_sb_info *sbi = AFFS_SB(sb);
303
304 if (sb->s_blocksize)
305 seq_printf(m, ",bs=%lu", sb->s_blocksize);
306 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
307 seq_printf(m, ",mode=%o", sbi->s_mode);
308 if (affs_test_opt(sbi->s_flags, SF_MUFS))
309 seq_puts(m, ",mufs");
310 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
311 seq_puts(m, ",nofilenametruncate");
312 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
313 seq_printf(m, ",prefix=%s", sbi->s_prefix);
314 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
315 seq_puts(m, ",protect");
316 if (sbi->s_reserved != 2)
317 seq_printf(m, ",reserved=%u", sbi->s_reserved);
318 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
319 seq_printf(m, ",root=%u", sbi->s_root_block);
320 if (affs_test_opt(sbi->s_flags, SF_SETGID))
321 seq_printf(m, ",setgid=%u",
322 from_kgid_munged(&init_user_ns, sbi->s_gid));
323 if (affs_test_opt(sbi->s_flags, SF_SETUID))
324 seq_printf(m, ",setuid=%u",
325 from_kuid_munged(&init_user_ns, sbi->s_uid));
326 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
327 seq_puts(m, ",verbose");
328 if (sbi->s_volume[0])
329 seq_printf(m, ",volume=%s", sbi->s_volume);
330 return 0;
331}
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333/* This function definitely needs to be split up. Some fine day I'll
334 * hopefully have the guts to do so. Until then: sorry for the mess.
335 */
336
337static int affs_fill_super(struct super_block *sb, void *data, int silent)
338{
339 struct affs_sb_info *sbi;
340 struct buffer_head *root_bh = NULL;
341 struct buffer_head *boot_bh;
342 struct inode *root_inode = NULL;
343 s32 root_block;
344 int size, blocksize;
345 u32 chksum;
346 int num_bm;
347 int i, j;
Eric W. Biederman8fed10b2012-02-07 16:20:16 -0800348 kuid_t uid;
349 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 int reserved;
351 unsigned long mount_flags;
352 int tmp_flags; /* fix remount prototype... */
Al Viro2b943cf2006-06-25 05:49:08 -0700353 u8 sig[4];
Al Viro842a8592013-12-10 14:43:54 -0500354 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Fabian Frederick9606d9a2014-06-06 14:37:25 -0700356 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 sb->s_magic = AFFS_SUPER_MAGIC;
359 sb->s_op = &affs_sops;
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800360 sb->s_flags |= SB_NODIRATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700362 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 if (!sbi)
364 return -ENOMEM;
Jan Blunck74c41422010-08-15 22:52:36 +0200365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 sb->s_fs_info = sbi;
Artem Bityutskiya215fef2012-06-06 18:56:56 +0300367 sbi->sb = sb;
Matthias Kaehlcke7d135a52008-07-25 19:44:51 -0700368 mutex_init(&sbi->s_bmlock);
Al Viro29333922010-01-24 00:04:07 -0500369 spin_lock_init(&sbi->symlink_lock);
Artem Bityutskiy3dd84782012-06-06 18:56:57 +0300370 spin_lock_init(&sbi->work_lock);
371 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
373 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
374 &blocksize,&sbi->s_prefix,
375 sbi->s_volume, &mount_flags)) {
Fabian Frederick0158de12014-06-06 14:37:24 -0700376 pr_err("Error parsing options\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return -EINVAL;
378 }
379 /* N.B. after this point s_prefix must be released */
380
381 sbi->s_flags = mount_flags;
382 sbi->s_mode = i;
383 sbi->s_uid = uid;
384 sbi->s_gid = gid;
385 sbi->s_reserved= reserved;
386
387 /* Get the size of the device in 512-byte blocks.
388 * If we later see that the partition uses bigger
389 * blocks, we will have to change it.
390 */
391
Pranay Kr. Srivastavae852d822015-09-09 15:39:09 -0700392 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
Fabian Frederick9606d9a2014-06-06 14:37:25 -0700393 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 affs_set_blocksize(sb, PAGE_SIZE);
396 /* Try to find root block. Its location depends on the block size. */
397
Pranay Kr. Srivastavae852d822015-09-09 15:39:09 -0700398 i = bdev_logical_block_size(sb->s_bdev);
399 j = PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 if (blocksize > 0) {
401 i = j = blocksize;
402 size = size / (blocksize / 512);
403 }
Pranay Kr. Srivastavae852d822015-09-09 15:39:09 -0700404
Fabian Frederick1e907f42014-10-13 15:53:50 -0700405 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 sbi->s_root_block = root_block;
407 if (root_block < 0)
408 sbi->s_root_block = (reserved + size - 1) / 2;
Fabian Frederick9606d9a2014-06-06 14:37:25 -0700409 pr_debug("setting blocksize to %d\n", blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 affs_set_blocksize(sb, blocksize);
411 sbi->s_partition_size = size;
412
413 /* The root block location that was calculated above is not
414 * correct if the partition size is an odd number of 512-
415 * byte blocks, which will be rounded down to a number of
416 * 1024-byte blocks, and if there were an even number of
417 * reserved blocks. Ideally, all partition checkers should
418 * report the real number of blocks of the real blocksize,
419 * but since this just cannot be done, we have to try to
420 * find the root block anyways. In the above case, it is one
421 * block behind the calculated one. So we check this one, too.
422 */
423 for (num_bm = 0; num_bm < 2; num_bm++) {
Fabian Frederick9606d9a2014-06-06 14:37:25 -0700424 pr_debug("Dev %s, trying root=%u, bs=%d, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 "size=%d, reserved=%d\n",
426 sb->s_id,
427 sbi->s_root_block + num_bm,
428 blocksize, size, reserved);
429 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
430 if (!root_bh)
431 continue;
432 if (!affs_checksum_block(sb, root_bh) &&
433 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
434 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
435 sbi->s_hashsize = blocksize / 4 - 56;
436 sbi->s_root_block += num_bm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 goto got_root;
438 }
439 affs_brelse(root_bh);
440 root_bh = NULL;
441 }
442 }
443 if (!silent)
Fabian Frederick0158de12014-06-06 14:37:24 -0700444 pr_err("No valid root block on device %s\n", sb->s_id);
Al Viro842a8592013-12-10 14:43:54 -0500445 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447 /* N.B. after this point bh must be released */
448got_root:
Al Viro842a8592013-12-10 14:43:54 -0500449 /* Keep super block in cache */
450 sbi->s_root_bh = root_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 root_block = sbi->s_root_block;
452
453 /* Find out which kind of FS we have */
454 boot_bh = sb_bread(sb, 0);
455 if (!boot_bh) {
Fabian Frederick0158de12014-06-06 14:37:24 -0700456 pr_err("Cannot read boot block\n");
Al Viro842a8592013-12-10 14:43:54 -0500457 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
Al Viro2b943cf2006-06-25 05:49:08 -0700459 memcpy(sig, boot_bh->b_data, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 brelse(boot_bh);
Al Viro2b943cf2006-06-25 05:49:08 -0700461 chksum = be32_to_cpu(*(__be32 *)sig);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463 /* Dircache filesystems are compatible with non-dircache ones
464 * when reading. As long as they aren't supported, writing is
465 * not recommended.
466 */
467 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
David Howellsbc98a422017-07-17 08:45:34 +0100468 || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
Fabian Frederick0158de12014-06-06 14:37:24 -0700469 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800470 sb->s_flags |= SB_RDONLY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 }
472 switch (chksum) {
Fabian Frederick0445f012015-02-17 13:46:33 -0800473 case MUFS_FS:
474 case MUFS_INTLFFS:
475 case MUFS_DCFFS:
Fabian Frederick34f24832015-04-16 12:48:21 -0700476 affs_set_opt(sbi->s_flags, SF_MUFS);
Fabian Frederick0445f012015-02-17 13:46:33 -0800477 /* fall thru */
478 case FS_INTLFFS:
479 case FS_DCFFS:
Fabian Frederick34f24832015-04-16 12:48:21 -0700480 affs_set_opt(sbi->s_flags, SF_INTL);
Fabian Frederick0445f012015-02-17 13:46:33 -0800481 break;
482 case MUFS_FFS:
Fabian Frederick34f24832015-04-16 12:48:21 -0700483 affs_set_opt(sbi->s_flags, SF_MUFS);
Fabian Frederick0445f012015-02-17 13:46:33 -0800484 break;
485 case FS_FFS:
486 break;
487 case MUFS_OFS:
Fabian Frederick34f24832015-04-16 12:48:21 -0700488 affs_set_opt(sbi->s_flags, SF_MUFS);
Fabian Frederick0445f012015-02-17 13:46:33 -0800489 /* fall thru */
490 case FS_OFS:
Fabian Frederick34f24832015-04-16 12:48:21 -0700491 affs_set_opt(sbi->s_flags, SF_OFS);
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800492 sb->s_flags |= SB_NOEXEC;
Fabian Frederick0445f012015-02-17 13:46:33 -0800493 break;
494 case MUFS_DCOFS:
495 case MUFS_INTLOFS:
Fabian Frederick34f24832015-04-16 12:48:21 -0700496 affs_set_opt(sbi->s_flags, SF_MUFS);
Fabian Frederick0445f012015-02-17 13:46:33 -0800497 case FS_DCOFS:
498 case FS_INTLOFS:
Fabian Frederick34f24832015-04-16 12:48:21 -0700499 affs_set_opt(sbi->s_flags, SF_INTL);
500 affs_set_opt(sbi->s_flags, SF_OFS);
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800501 sb->s_flags |= SB_NOEXEC;
Fabian Frederick0445f012015-02-17 13:46:33 -0800502 break;
503 default:
504 pr_err("Unknown filesystem on device %s: %08X\n",
505 sb->s_id, chksum);
506 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 }
508
Fabian Frederick79bda4d2015-04-16 12:48:24 -0700509 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
Al Viro2b943cf2006-06-25 05:49:08 -0700510 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
Fabian Frederick0158de12014-06-06 14:37:24 -0700511 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
Al Viro2b943cf2006-06-25 05:49:08 -0700512 len > 31 ? 31 : len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
Al Viro2b943cf2006-06-25 05:49:08 -0700514 sig, sig[3] + '0', blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 }
516
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800517 sb->s_flags |= SB_NODEV | SB_NOSUID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 sbi->s_data_blksize = sb->s_blocksize;
Fabian Frederick79bda4d2015-04-16 12:48:24 -0700520 if (affs_test_opt(sbi->s_flags, SF_OFS))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 sbi->s_data_blksize -= 24;
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 tmp_flags = sb->s_flags;
Al Viro842a8592013-12-10 14:43:54 -0500524 ret = affs_init_bitmap(sb, &tmp_flags);
525 if (ret)
526 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 sb->s_flags = tmp_flags;
528
529 /* set up enough so that it can read an inode */
530
David Howells210f8552008-02-07 00:15:29 -0800531 root_inode = affs_iget(sb, root_block);
Al Viro842a8592013-12-10 14:43:54 -0500532 if (IS_ERR(root_inode))
533 return PTR_ERR(root_inode);
David Howells210f8552008-02-07 00:15:29 -0800534
Fabian Frederick79bda4d2015-04-16 12:48:24 -0700535 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
Al Viroa1298802011-01-12 16:45:19 -0500536 sb->s_d_op = &affs_intl_dentry_operations;
537 else
538 sb->s_d_op = &affs_dentry_operations;
539
Al Viro48fde702012-01-08 22:15:13 -0500540 sb->s_root = d_make_root(root_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (!sb->s_root) {
Fabian Frederick0158de12014-06-06 14:37:24 -0700542 pr_err("AFFS: Get root inode failed\n");
Al Viro842a8592013-12-10 14:43:54 -0500543 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Fabian Fredericked4433d2017-02-27 14:27:49 -0800546 sb->s_export_op = &affs_export_ops;
Fabian Frederick9606d9a2014-06-06 14:37:25 -0700547 pr_debug("s_flags=%lX\n", sb->s_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549}
550
551static int
552affs_remount(struct super_block *sb, int *flags, char *data)
553{
554 struct affs_sb_info *sbi = AFFS_SB(sb);
555 int blocksize;
Eric W. Biederman8fed10b2012-02-07 16:20:16 -0800556 kuid_t uid;
557 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 int mode;
559 int reserved;
560 int root_block;
561 unsigned long mount_flags;
562 int res = 0;
Sanidhya Kashyapc8f33d02015-04-16 12:48:26 -0700563 char *new_opts;
Al Viro29333922010-01-24 00:04:07 -0500564 char volume[32];
565 char *prefix = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Sanidhya Kashyapc8f33d02015-04-16 12:48:26 -0700567 new_opts = kstrdup(data, GFP_KERNEL);
Mikulas Patocka01d6e082016-05-24 22:48:33 +0200568 if (data && !new_opts)
Sanidhya Kashyapc8f33d02015-04-16 12:48:26 -0700569 return -ENOMEM;
570
Fabian Frederick9606d9a2014-06-06 14:37:25 -0700571 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Theodore Ts'o02b99842014-03-13 10:14:33 -0400573 sync_filesystem(sb);
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800574 *flags |= SB_NODIRATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Al Viro29333922010-01-24 00:04:07 -0500576 memcpy(volume, sbi->s_volume, 32);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800577 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
Al Viro29333922010-01-24 00:04:07 -0500578 &blocksize, &prefix, volume,
Miklos Szeredie9b39612008-02-08 04:21:36 -0800579 &mount_flags)) {
Al Viro29333922010-01-24 00:04:07 -0500580 kfree(prefix);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800581 kfree(new_opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 return -EINVAL;
Miklos Szeredie9b39612008-02-08 04:21:36 -0800583 }
Jan Blunck74c41422010-08-15 22:52:36 +0200584
Tejun Heo43829732012-08-20 14:51:24 -0700585 flush_delayed_work(&sbi->sb_work);
Miklos Szeredie9b39612008-02-08 04:21:36 -0800586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 sbi->s_flags = mount_flags;
588 sbi->s_mode = mode;
589 sbi->s_uid = uid;
590 sbi->s_gid = gid;
Al Viro29333922010-01-24 00:04:07 -0500591 /* protect against readers */
592 spin_lock(&sbi->symlink_lock);
593 if (prefix) {
594 kfree(sbi->s_prefix);
595 sbi->s_prefix = prefix;
596 }
597 memcpy(sbi->s_volume, volume, 32);
598 spin_unlock(&sbi->symlink_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800600 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 return 0;
Jan Blunck74c41422010-08-15 22:52:36 +0200602
Linus Torvalds1751e8a2017-11-27 13:05:09 -0800603 if (*flags & SB_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 affs_free_bitmap(sb);
Artem Bityutskiy0164b1a2012-06-06 18:56:53 +0300605 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 res = affs_init_bitmap(sb, flags);
607
608 return res;
609}
610
611static int
David Howells726c3342006-06-23 02:02:58 -0700612affs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613{
David Howells726c3342006-06-23 02:02:58 -0700614 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 int free;
Coly Lia6a2a732009-04-02 16:59:32 -0700616 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Fabian Frederick9606d9a2014-06-06 14:37:25 -0700618 pr_debug("%s() partsize=%d, reserved=%d\n",
619 __func__, AFFS_SB(sb)->s_partition_size,
620 AFFS_SB(sb)->s_reserved);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
622 free = affs_count_free_blocks(sb);
623 buf->f_type = AFFS_SUPER_MAGIC;
624 buf->f_bsize = sb->s_blocksize;
625 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
626 buf->f_bfree = free;
627 buf->f_bavail = free;
Coly Lia6a2a732009-04-02 16:59:32 -0700628 buf->f_fsid.val[0] = (u32)id;
629 buf->f_fsid.val[1] = (u32)(id >> 32);
Fabian Frederickf1578532015-02-17 13:46:23 -0800630 buf->f_namelen = AFFSNAMEMAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 return 0;
632}
633
Al Viro152a0832010-07-25 00:46:55 +0400634static struct dentry *affs_mount(struct file_system_type *fs_type,
635 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
Al Viro152a0832010-07-25 00:46:55 +0400637 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
Al Viro842a8592013-12-10 14:43:54 -0500640static void affs_kill_sb(struct super_block *sb)
641{
642 struct affs_sb_info *sbi = AFFS_SB(sb);
643 kill_block_super(sb);
644 if (sbi) {
645 affs_free_bitmap(sb);
646 affs_brelse(sbi->s_root_bh);
647 kfree(sbi->s_prefix);
Fabian Frederick4d29e572015-02-17 13:46:17 -0800648 mutex_destroy(&sbi->s_bmlock);
Al Viro842a8592013-12-10 14:43:54 -0500649 kfree(sbi);
650 }
651}
652
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653static struct file_system_type affs_fs_type = {
654 .owner = THIS_MODULE,
655 .name = "affs",
Al Viro152a0832010-07-25 00:46:55 +0400656 .mount = affs_mount,
Al Viro842a8592013-12-10 14:43:54 -0500657 .kill_sb = affs_kill_sb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 .fs_flags = FS_REQUIRES_DEV,
659};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800660MODULE_ALIAS_FS("affs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
662static int __init init_affs_fs(void)
663{
664 int err = init_inodecache();
665 if (err)
666 goto out1;
667 err = register_filesystem(&affs_fs_type);
668 if (err)
669 goto out;
670 return 0;
671out:
672 destroy_inodecache();
673out1:
674 return err;
675}
676
677static void __exit exit_affs_fs(void)
678{
679 unregister_filesystem(&affs_fs_type);
680 destroy_inodecache();
681}
682
683MODULE_DESCRIPTION("Amiga filesystem support for Linux");
684MODULE_LICENSE("GPL");
685
686module_init(init_affs_fs)
687module_exit(exit_affs_fs)