Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jeff Garzik | e18fa70 | 2006-09-24 11:13:19 -0400 | [diff] [blame] | 17 | #include <linux/magic.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Ingo Molnar | 5b825c3 | 2017-02-02 17:54:15 +0100 | [diff] [blame] | 19 | #include <linux/cred.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Artem Bityutskiy | 3dd8478 | 2012-06-06 18:56:57 +0300 | [diff] [blame] | 21 | #include <linux/writeback.h> |
Pranay Kr. Srivastava | e852d82 | 2015-09-09 15:39:09 -0700 | [diff] [blame] | 22 | #include <linux/blkdev.h> |
David Howells | 26a7655 | 2017-07-05 16:25:16 +0100 | [diff] [blame] | 23 | #include <linux/seq_file.h> |
Jeff Layton | 9dffe56 | 2017-12-11 06:35:10 -0500 | [diff] [blame] | 24 | #include <linux/iversion.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "affs.h" |
| 26 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 27 | static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
David Howells | 26a7655 | 2017-07-05 16:25:16 +0100 | [diff] [blame] | 28 | static int affs_show_options(struct seq_file *m, struct dentry *root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | static int affs_remount (struct super_block *sb, int *flags, char *data); |
| 30 | |
| 31 | static void |
Artem Bityutskiy | bc86256 | 2012-06-06 18:56:51 +0300 | [diff] [blame] | 32 | affs_commit_super(struct super_block *sb, int wait) |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 33 | { |
| 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 Bityutskiy | a837107 | 2012-06-06 18:56:55 +0300 | [diff] [blame] | 38 | lock_buffer(bh); |
Fabian Frederick | c161820 | 2017-02-27 14:27:54 -0800 | [diff] [blame] | 39 | affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change); |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 40 | affs_fix_checksum(sb, bh); |
Artem Bityutskiy | a837107 | 2012-06-06 18:56:55 +0300 | [diff] [blame] | 41 | unlock_buffer(bh); |
| 42 | |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 43 | mark_buffer_dirty(bh); |
Artem Bityutskiy | 7435d50 | 2010-07-05 15:15:00 +0300 | [diff] [blame] | 44 | if (wait) |
| 45 | sync_dirty_buffer(bh); |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | affs_put_super(struct super_block *sb) |
| 50 | { |
| 51 | struct affs_sb_info *sbi = AFFS_SB(sb); |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 52 | pr_debug("%s()\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Artem Bityutskiy | 3dd8478 | 2012-06-06 18:56:57 +0300 | [diff] [blame] | 54 | cancel_delayed_work_sync(&sbi->sb_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | } |
| 56 | |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 57 | static int |
| 58 | affs_sync_fs(struct super_block *sb, int wait) |
| 59 | { |
Artem Bityutskiy | bc86256 | 2012-06-06 18:56:51 +0300 | [diff] [blame] | 60 | affs_commit_super(sb, wait); |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 61 | return 0; |
| 62 | } |
| 63 | |
Artem Bityutskiy | 3dd8478 | 2012-06-06 18:56:57 +0300 | [diff] [blame] | 64 | static 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 | |
| 79 | void affs_mark_sb_dirty(struct super_block *sb) |
| 80 | { |
| 81 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 82 | unsigned long delay; |
| 83 | |
David Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 84 | if (sb_rdonly(sb)) |
Artem Bityutskiy | 3dd8478 | 2012-06-06 18:56:57 +0300 | [diff] [blame] | 85 | 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 Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 96 | static struct kmem_cache * affs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | static struct inode *affs_alloc_inode(struct super_block *sb) |
| 99 | { |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 100 | struct affs_inode_info *i; |
| 101 | |
| 102 | i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); |
| 103 | if (!i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | return NULL; |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 105 | |
Jeff Layton | 9dffe56 | 2017-12-11 06:35:10 -0500 | [diff] [blame] | 106 | inode_set_iversion(&i->vfs_inode, 1); |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 107 | i->i_lc = NULL; |
| 108 | i->i_ext_bh = NULL; |
| 109 | i->i_pa_cnt = 0; |
| 110 | |
| 111 | return &i->vfs_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 114 | static void affs_i_callback(struct rcu_head *head) |
| 115 | { |
| 116 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 117 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
| 118 | } |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | static void affs_destroy_inode(struct inode *inode) |
| 121 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 122 | call_rcu(&inode->i_rcu, affs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 125 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | { |
| 127 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
| 128 | |
Thomas Gleixner | 756b032 | 2010-09-07 14:33:11 +0000 | [diff] [blame] | 129 | sema_init(&ei->i_link_lock, 1); |
| 130 | sema_init(&ei->i_ext_lock, 1); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 131 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | } |
| 133 | |
Fabian Frederick | adbd319 | 2014-04-07 15:38:59 -0700 | [diff] [blame] | 134 | static int __init init_inodecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
| 136 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", |
| 137 | sizeof(struct affs_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 138 | 0, (SLAB_RECLAIM_ACCOUNT| |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 139 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 140 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | if (affs_inode_cachep == NULL) |
| 142 | return -ENOMEM; |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static void destroy_inodecache(void) |
| 147 | { |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 148 | /* |
| 149 | * Make sure all delayed rcu free inodes are flushed before we |
| 150 | * destroy cache. |
| 151 | */ |
| 152 | rcu_barrier(); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 153 | kmem_cache_destroy(affs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 156 | static const struct super_operations affs_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | .alloc_inode = affs_alloc_inode, |
| 158 | .destroy_inode = affs_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | .write_inode = affs_write_inode, |
Al Viro | f053ddd | 2010-06-06 10:16:41 -0400 | [diff] [blame] | 160 | .evict_inode = affs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | .put_super = affs_put_super, |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 162 | .sync_fs = affs_sync_fs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | .statfs = affs_statfs, |
| 164 | .remount_fs = affs_remount, |
David Howells | 26a7655 | 2017-07-05 16:25:16 +0100 | [diff] [blame] | 165 | .show_options = affs_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | }; |
| 167 | |
| 168 | enum { |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 169 | Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
| 171 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
| 172 | }; |
| 173 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 174 | static const match_table_t tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | {Opt_bs, "bs=%u"}, |
| 176 | {Opt_mode, "mode=%o"}, |
| 177 | {Opt_mufs, "mufs"}, |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 178 | {Opt_notruncate, "nofilenametruncate"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | {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 | |
| 194 | static int |
Eric W. Biederman | 8fed10b | 2012-02-07 16:20:16 -0800 | [diff] [blame] | 195 | parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | 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 Howells | 2155998 | 2008-11-14 10:38:45 +1100 | [diff] [blame] | 203 | *uid = current_uid(); |
| 204 | *gid = current_gid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | *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 Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 223 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | if (n != 512 && n != 1024 && n != 2048 |
| 225 | && n != 4096) { |
Fabian Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 226 | pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | return 0; |
| 228 | } |
| 229 | *blocksize = n; |
| 230 | break; |
| 231 | case Opt_mode: |
| 232 | if (match_octal(&args[0], &option)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 233 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | *mode = option & 0777; |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 235 | affs_set_opt(*mount_opts, SF_SETMODE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | break; |
| 237 | case Opt_mufs: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 238 | affs_set_opt(*mount_opts, SF_MUFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | break; |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 240 | case Opt_notruncate: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 241 | affs_set_opt(*mount_opts, SF_NO_TRUNCATE); |
Fabian Frederick | 8ca5772 | 2014-04-07 15:39:01 -0700 | [diff] [blame] | 242 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | case Opt_prefix: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | *prefix = match_strdup(&args[0]); |
| 245 | if (!*prefix) |
| 246 | return 0; |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 247 | affs_set_opt(*mount_opts, SF_PREFIX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | break; |
| 249 | case Opt_protect: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 250 | affs_set_opt(*mount_opts, SF_IMMUTABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | break; |
| 252 | case Opt_reserved: |
| 253 | if (match_int(&args[0], reserved)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 254 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | break; |
| 256 | case Opt_root: |
| 257 | if (match_int(&args[0], root)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 258 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | break; |
| 260 | case Opt_setgid: |
| 261 | if (match_int(&args[0], &option)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 262 | return 0; |
Eric W. Biederman | 8fed10b | 2012-02-07 16:20:16 -0800 | [diff] [blame] | 263 | *gid = make_kgid(current_user_ns(), option); |
| 264 | if (!gid_valid(*gid)) |
| 265 | return 0; |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 266 | affs_set_opt(*mount_opts, SF_SETGID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | break; |
| 268 | case Opt_setuid: |
| 269 | if (match_int(&args[0], &option)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 270 | return 0; |
Eric W. Biederman | 8fed10b | 2012-02-07 16:20:16 -0800 | [diff] [blame] | 271 | *uid = make_kuid(current_user_ns(), option); |
| 272 | if (!uid_valid(*uid)) |
| 273 | return 0; |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 274 | affs_set_opt(*mount_opts, SF_SETUID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | break; |
| 276 | case Opt_verbose: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 277 | affs_set_opt(*mount_opts, SF_VERBOSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | break; |
| 279 | case Opt_volume: { |
| 280 | char *vol = match_strdup(&args[0]); |
Jim Meyering | 6db27dd | 2008-04-29 00:59:06 -0700 | [diff] [blame] | 281 | if (!vol) |
| 282 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | 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 Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 291 | pr_warn("Unrecognized mount option \"%s\" or missing value\n", |
| 292 | p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | return 0; |
| 294 | } |
| 295 | } |
| 296 | return 1; |
| 297 | } |
| 298 | |
David Howells | 26a7655 | 2017-07-05 16:25:16 +0100 | [diff] [blame] | 299 | static 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | /* 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 | |
| 337 | static 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. Biederman | 8fed10b | 2012-02-07 16:20:16 -0800 | [diff] [blame] | 348 | kuid_t uid; |
| 349 | kgid_t gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | int reserved; |
| 351 | unsigned long mount_flags; |
| 352 | int tmp_flags; /* fix remount prototype... */ |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 353 | u8 sig[4]; |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 354 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 356 | pr_debug("read_super(%s)\n", data ? (const char *)data : "no options"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
| 358 | sb->s_magic = AFFS_SUPER_MAGIC; |
| 359 | sb->s_op = &affs_sops; |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 360 | sb->s_flags |= SB_NODIRATIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 362 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | if (!sbi) |
| 364 | return -ENOMEM; |
Jan Blunck | 74c4142 | 2010-08-15 22:52:36 +0200 | [diff] [blame] | 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | sb->s_fs_info = sbi; |
Artem Bityutskiy | a215fef | 2012-06-06 18:56:56 +0300 | [diff] [blame] | 367 | sbi->sb = sb; |
Matthias Kaehlcke | 7d135a5 | 2008-07-25 19:44:51 -0700 | [diff] [blame] | 368 | mutex_init(&sbi->s_bmlock); |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 369 | spin_lock_init(&sbi->symlink_lock); |
Artem Bityutskiy | 3dd8478 | 2012-06-06 18:56:57 +0300 | [diff] [blame] | 370 | spin_lock_init(&sbi->work_lock); |
| 371 | INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
| 373 | if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, |
| 374 | &blocksize,&sbi->s_prefix, |
| 375 | sbi->s_volume, &mount_flags)) { |
Fabian Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 376 | pr_err("Error parsing options\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | 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. Srivastava | e852d82 | 2015-09-09 15:39:09 -0700 | [diff] [blame] | 392 | size = i_size_read(sb->s_bdev->bd_inode) >> 9; |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 393 | pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | affs_set_blocksize(sb, PAGE_SIZE); |
| 396 | /* Try to find root block. Its location depends on the block size. */ |
| 397 | |
Pranay Kr. Srivastava | e852d82 | 2015-09-09 15:39:09 -0700 | [diff] [blame] | 398 | i = bdev_logical_block_size(sb->s_bdev); |
| 399 | j = PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | if (blocksize > 0) { |
| 401 | i = j = blocksize; |
| 402 | size = size / (blocksize / 512); |
| 403 | } |
Pranay Kr. Srivastava | e852d82 | 2015-09-09 15:39:09 -0700 | [diff] [blame] | 404 | |
Fabian Frederick | 1e907f4 | 2014-10-13 15:53:50 -0700 | [diff] [blame] | 405 | for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | sbi->s_root_block = root_block; |
| 407 | if (root_block < 0) |
| 408 | sbi->s_root_block = (reserved + size - 1) / 2; |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 409 | pr_debug("setting blocksize to %d\n", blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | 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 Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 424 | pr_debug("Dev %s, trying root=%u, bs=%d, " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | "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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | goto got_root; |
| 438 | } |
| 439 | affs_brelse(root_bh); |
| 440 | root_bh = NULL; |
| 441 | } |
| 442 | } |
| 443 | if (!silent) |
Fabian Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 444 | pr_err("No valid root block on device %s\n", sb->s_id); |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 445 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | /* N.B. after this point bh must be released */ |
| 448 | got_root: |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 449 | /* Keep super block in cache */ |
| 450 | sbi->s_root_bh = root_bh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | 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 Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 456 | pr_err("Cannot read boot block\n"); |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 457 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 459 | memcpy(sig, boot_bh->b_data, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | brelse(boot_bh); |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 461 | chksum = be32_to_cpu(*(__be32 *)sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
| 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 Howells | bc98a42 | 2017-07-17 08:45:34 +0100 | [diff] [blame] | 468 | || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) { |
Fabian Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 469 | pr_notice("Dircache FS - mounting %s read only\n", sb->s_id); |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 470 | sb->s_flags |= SB_RDONLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | switch (chksum) { |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 473 | case MUFS_FS: |
| 474 | case MUFS_INTLFFS: |
| 475 | case MUFS_DCFFS: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 476 | affs_set_opt(sbi->s_flags, SF_MUFS); |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 477 | /* fall thru */ |
| 478 | case FS_INTLFFS: |
| 479 | case FS_DCFFS: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 480 | affs_set_opt(sbi->s_flags, SF_INTL); |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 481 | break; |
| 482 | case MUFS_FFS: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 483 | affs_set_opt(sbi->s_flags, SF_MUFS); |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 484 | break; |
| 485 | case FS_FFS: |
| 486 | break; |
| 487 | case MUFS_OFS: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 488 | affs_set_opt(sbi->s_flags, SF_MUFS); |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 489 | /* fall thru */ |
| 490 | case FS_OFS: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 491 | affs_set_opt(sbi->s_flags, SF_OFS); |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 492 | sb->s_flags |= SB_NOEXEC; |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 493 | break; |
| 494 | case MUFS_DCOFS: |
| 495 | case MUFS_INTLOFS: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 496 | affs_set_opt(sbi->s_flags, SF_MUFS); |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 497 | case FS_DCOFS: |
| 498 | case FS_INTLOFS: |
Fabian Frederick | 34f2483 | 2015-04-16 12:48:21 -0700 | [diff] [blame] | 499 | affs_set_opt(sbi->s_flags, SF_INTL); |
| 500 | affs_set_opt(sbi->s_flags, SF_OFS); |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 501 | sb->s_flags |= SB_NOEXEC; |
Fabian Frederick | 0445f01 | 2015-02-17 13:46:33 -0800 | [diff] [blame] | 502 | break; |
| 503 | default: |
| 504 | pr_err("Unknown filesystem on device %s: %08X\n", |
| 505 | sb->s_id, chksum); |
| 506 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
Fabian Frederick | 79bda4d | 2015-04-16 12:48:24 -0700 | [diff] [blame] | 509 | if (affs_test_opt(mount_flags, SF_VERBOSE)) { |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 510 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
Fabian Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 511 | pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 512 | len > 31 ? 31 : len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 514 | sig, sig[3] + '0', blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 517 | sb->s_flags |= SB_NODEV | SB_NOSUID; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | sbi->s_data_blksize = sb->s_blocksize; |
Fabian Frederick | 79bda4d | 2015-04-16 12:48:24 -0700 | [diff] [blame] | 520 | if (affs_test_opt(sbi->s_flags, SF_OFS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | sbi->s_data_blksize -= 24; |
| 522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | tmp_flags = sb->s_flags; |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 524 | ret = affs_init_bitmap(sb, &tmp_flags); |
| 525 | if (ret) |
| 526 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | sb->s_flags = tmp_flags; |
| 528 | |
| 529 | /* set up enough so that it can read an inode */ |
| 530 | |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 531 | root_inode = affs_iget(sb, root_block); |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 532 | if (IS_ERR(root_inode)) |
| 533 | return PTR_ERR(root_inode); |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 534 | |
Fabian Frederick | 79bda4d | 2015-04-16 12:48:24 -0700 | [diff] [blame] | 535 | if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL)) |
Al Viro | a129880 | 2011-01-12 16:45:19 -0500 | [diff] [blame] | 536 | sb->s_d_op = &affs_intl_dentry_operations; |
| 537 | else |
| 538 | sb->s_d_op = &affs_dentry_operations; |
| 539 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 540 | sb->s_root = d_make_root(root_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | if (!sb->s_root) { |
Fabian Frederick | 0158de1 | 2014-06-06 14:37:24 -0700 | [diff] [blame] | 542 | pr_err("AFFS: Get root inode failed\n"); |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 543 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Fabian Frederick | ed4433d | 2017-02-27 14:27:49 -0800 | [diff] [blame] | 546 | sb->s_export_op = &affs_export_ops; |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 547 | pr_debug("s_flags=%lX\n", sb->s_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | static int |
| 552 | affs_remount(struct super_block *sb, int *flags, char *data) |
| 553 | { |
| 554 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 555 | int blocksize; |
Eric W. Biederman | 8fed10b | 2012-02-07 16:20:16 -0800 | [diff] [blame] | 556 | kuid_t uid; |
| 557 | kgid_t gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | int mode; |
| 559 | int reserved; |
| 560 | int root_block; |
| 561 | unsigned long mount_flags; |
| 562 | int res = 0; |
Sanidhya Kashyap | c8f33d0 | 2015-04-16 12:48:26 -0700 | [diff] [blame] | 563 | char *new_opts; |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 564 | char volume[32]; |
| 565 | char *prefix = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Sanidhya Kashyap | c8f33d0 | 2015-04-16 12:48:26 -0700 | [diff] [blame] | 567 | new_opts = kstrdup(data, GFP_KERNEL); |
Mikulas Patocka | 01d6e08 | 2016-05-24 22:48:33 +0200 | [diff] [blame] | 568 | if (data && !new_opts) |
Sanidhya Kashyap | c8f33d0 | 2015-04-16 12:48:26 -0700 | [diff] [blame] | 569 | return -ENOMEM; |
| 570 | |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 571 | pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
Theodore Ts'o | 02b9984 | 2014-03-13 10:14:33 -0400 | [diff] [blame] | 573 | sync_filesystem(sb); |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 574 | *flags |= SB_NODIRATIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 576 | memcpy(volume, sbi->s_volume, 32); |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 577 | if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 578 | &blocksize, &prefix, volume, |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 579 | &mount_flags)) { |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 580 | kfree(prefix); |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 581 | kfree(new_opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | return -EINVAL; |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 583 | } |
Jan Blunck | 74c4142 | 2010-08-15 22:52:36 +0200 | [diff] [blame] | 584 | |
Tejun Heo | 4382973 | 2012-08-20 14:51:24 -0700 | [diff] [blame] | 585 | flush_delayed_work(&sbi->sb_work); |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 586 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | sbi->s_flags = mount_flags; |
| 588 | sbi->s_mode = mode; |
| 589 | sbi->s_uid = uid; |
| 590 | sbi->s_gid = gid; |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 591 | /* 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 600 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | return 0; |
Jan Blunck | 74c4142 | 2010-08-15 22:52:36 +0200 | [diff] [blame] | 602 | |
Linus Torvalds | 1751e8a | 2017-11-27 13:05:09 -0800 | [diff] [blame] | 603 | if (*flags & SB_RDONLY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | affs_free_bitmap(sb); |
Artem Bityutskiy | 0164b1a | 2012-06-06 18:56:53 +0300 | [diff] [blame] | 605 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | res = affs_init_bitmap(sb, flags); |
| 607 | |
| 608 | return res; |
| 609 | } |
| 610 | |
| 611 | static int |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 612 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 614 | struct super_block *sb = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | int free; |
Coly Li | a6a2a73 | 2009-04-02 16:59:32 -0700 | [diff] [blame] | 616 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
Fabian Frederick | 9606d9a | 2014-06-06 14:37:25 -0700 | [diff] [blame] | 618 | pr_debug("%s() partsize=%d, reserved=%d\n", |
| 619 | __func__, AFFS_SB(sb)->s_partition_size, |
| 620 | AFFS_SB(sb)->s_reserved); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
| 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 Li | a6a2a73 | 2009-04-02 16:59:32 -0700 | [diff] [blame] | 628 | buf->f_fsid.val[0] = (u32)id; |
| 629 | buf->f_fsid.val[1] = (u32)(id >> 32); |
Fabian Frederick | f157853 | 2015-02-17 13:46:23 -0800 | [diff] [blame] | 630 | buf->f_namelen = AFFSNAMEMAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | return 0; |
| 632 | } |
| 633 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 634 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
| 635 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 637 | return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
| 639 | |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 640 | static 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 Frederick | 4d29e57 | 2015-02-17 13:46:17 -0800 | [diff] [blame] | 648 | mutex_destroy(&sbi->s_bmlock); |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 649 | kfree(sbi); |
| 650 | } |
| 651 | } |
| 652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | static struct file_system_type affs_fs_type = { |
| 654 | .owner = THIS_MODULE, |
| 655 | .name = "affs", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 656 | .mount = affs_mount, |
Al Viro | 842a859 | 2013-12-10 14:43:54 -0500 | [diff] [blame] | 657 | .kill_sb = affs_kill_sb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | .fs_flags = FS_REQUIRES_DEV, |
| 659 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 660 | MODULE_ALIAS_FS("affs"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
| 662 | static 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; |
| 671 | out: |
| 672 | destroy_inodecache(); |
| 673 | out1: |
| 674 | return err; |
| 675 | } |
| 676 | |
| 677 | static void __exit exit_affs_fs(void) |
| 678 | { |
| 679 | unregister_filesystem(&affs_fs_type); |
| 680 | destroy_inodecache(); |
| 681 | } |
| 682 | |
| 683 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); |
| 684 | MODULE_LICENSE("GPL"); |
| 685 | |
| 686 | module_init(init_affs_fs) |
| 687 | module_exit(exit_affs_fs) |