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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "affs.h" |
| 21 | |
| 22 | extern struct timezone sys_tz; |
| 23 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 24 | static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | static int affs_remount (struct super_block *sb, int *flags, char *data); |
| 26 | |
| 27 | static void |
Artem Bityutskiy | 7435d50 | 2010-07-05 15:15:00 +0300 | [diff] [blame] | 28 | affs_commit_super(struct super_block *sb, int wait, int clean) |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 29 | { |
| 30 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 31 | struct buffer_head *bh = sbi->s_root_bh; |
| 32 | struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh); |
| 33 | |
| 34 | tail->bm_flag = cpu_to_be32(clean); |
| 35 | secs_to_datestamp(get_seconds(), &tail->disk_change); |
| 36 | affs_fix_checksum(sb, bh); |
| 37 | mark_buffer_dirty(bh); |
Artem Bityutskiy | 7435d50 | 2010-07-05 15:15:00 +0300 | [diff] [blame] | 38 | if (wait) |
| 39 | sync_dirty_buffer(bh); |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 40 | } |
| 41 | |
| 42 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | affs_put_super(struct super_block *sb) |
| 44 | { |
| 45 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 46 | pr_debug("AFFS: put_super()\n"); |
| 47 | |
Artem Bityutskiy | 7435d50 | 2010-07-05 15:15:00 +0300 | [diff] [blame] | 48 | if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt) |
| 49 | affs_commit_super(sb, 1, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 51 | kfree(sbi->s_prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | affs_free_bitmap(sb); |
| 53 | affs_brelse(sbi->s_root_bh); |
| 54 | kfree(sbi); |
| 55 | sb->s_fs_info = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | static void |
| 59 | affs_write_super(struct super_block *sb) |
| 60 | { |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 61 | lock_super(sb); |
Artem Bityutskiy | 669d5f1 | 2010-07-05 15:14:59 +0300 | [diff] [blame] | 62 | if (!(sb->s_flags & MS_RDONLY)) |
Artem Bityutskiy | 7435d50 | 2010-07-05 15:15:00 +0300 | [diff] [blame] | 63 | affs_commit_super(sb, 1, 2); |
Artem Bityutskiy | 669d5f1 | 2010-07-05 15:14:59 +0300 | [diff] [blame] | 64 | sb->s_dirt = 0; |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 65 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Artem Bityutskiy | 669d5f1 | 2010-07-05 15:14:59 +0300 | [diff] [blame] | 67 | pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 70 | static int |
| 71 | affs_sync_fs(struct super_block *sb, int wait) |
| 72 | { |
| 73 | lock_super(sb); |
Artem Bityutskiy | 7435d50 | 2010-07-05 15:15:00 +0300 | [diff] [blame] | 74 | affs_commit_super(sb, wait, 2); |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 75 | sb->s_dirt = 0; |
| 76 | unlock_super(sb); |
| 77 | return 0; |
| 78 | } |
| 79 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 80 | static struct kmem_cache * affs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | static struct inode *affs_alloc_inode(struct super_block *sb) |
| 83 | { |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 84 | struct affs_inode_info *i; |
| 85 | |
| 86 | i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); |
| 87 | if (!i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | return NULL; |
Roman Zippel | dca3c33 | 2008-04-29 17:02:20 +0200 | [diff] [blame] | 89 | |
| 90 | i->vfs_inode.i_version = 1; |
| 91 | i->i_lc = NULL; |
| 92 | i->i_ext_bh = NULL; |
| 93 | i->i_pa_cnt = 0; |
| 94 | |
| 95 | return &i->vfs_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 98 | static void affs_i_callback(struct rcu_head *head) |
| 99 | { |
| 100 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 101 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
| 102 | } |
| 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | static void affs_destroy_inode(struct inode *inode) |
| 105 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 106 | call_rcu(&inode->i_rcu, affs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 109 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | { |
| 111 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
| 112 | |
Thomas Gleixner | 756b032 | 2010-09-07 14:33:11 +0000 | [diff] [blame] | 113 | sema_init(&ei->i_link_lock, 1); |
| 114 | sema_init(&ei->i_ext_lock, 1); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 115 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | static int init_inodecache(void) |
| 119 | { |
| 120 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", |
| 121 | sizeof(struct affs_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 122 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 123 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 124 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | if (affs_inode_cachep == NULL) |
| 126 | return -ENOMEM; |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | static void destroy_inodecache(void) |
| 131 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 132 | kmem_cache_destroy(affs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 135 | static const struct super_operations affs_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | .alloc_inode = affs_alloc_inode, |
| 137 | .destroy_inode = affs_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | .write_inode = affs_write_inode, |
Al Viro | f053ddd | 2010-06-06 10:16:41 -0400 | [diff] [blame] | 139 | .evict_inode = affs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | .put_super = affs_put_super, |
| 141 | .write_super = affs_write_super, |
Christoph Hellwig | e289643 | 2009-06-08 10:03:15 +0200 | [diff] [blame] | 142 | .sync_fs = affs_sync_fs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | .statfs = affs_statfs, |
| 144 | .remount_fs = affs_remount, |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 145 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | }; |
| 147 | |
| 148 | enum { |
| 149 | Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, |
| 150 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
| 151 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
| 152 | }; |
| 153 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 154 | static const match_table_t tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | {Opt_bs, "bs=%u"}, |
| 156 | {Opt_mode, "mode=%o"}, |
| 157 | {Opt_mufs, "mufs"}, |
| 158 | {Opt_prefix, "prefix=%s"}, |
| 159 | {Opt_protect, "protect"}, |
| 160 | {Opt_reserved, "reserved=%u"}, |
| 161 | {Opt_root, "root=%u"}, |
| 162 | {Opt_setgid, "setgid=%u"}, |
| 163 | {Opt_setuid, "setuid=%u"}, |
| 164 | {Opt_verbose, "verbose"}, |
| 165 | {Opt_volume, "volume=%s"}, |
| 166 | {Opt_ignore, "grpquota"}, |
| 167 | {Opt_ignore, "noquota"}, |
| 168 | {Opt_ignore, "quota"}, |
| 169 | {Opt_ignore, "usrquota"}, |
| 170 | {Opt_err, NULL}, |
| 171 | }; |
| 172 | |
| 173 | static int |
| 174 | parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, |
| 175 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) |
| 176 | { |
| 177 | char *p; |
| 178 | substring_t args[MAX_OPT_ARGS]; |
| 179 | |
| 180 | /* Fill in defaults */ |
| 181 | |
David Howells | 2155998 | 2008-11-14 10:38:45 +1100 | [diff] [blame] | 182 | *uid = current_uid(); |
| 183 | *gid = current_gid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | *reserved = 2; |
| 185 | *root = -1; |
| 186 | *blocksize = -1; |
| 187 | volume[0] = ':'; |
| 188 | volume[1] = 0; |
| 189 | *mount_opts = 0; |
| 190 | if (!options) |
| 191 | return 1; |
| 192 | |
| 193 | while ((p = strsep(&options, ",")) != NULL) { |
| 194 | int token, n, option; |
| 195 | if (!*p) |
| 196 | continue; |
| 197 | |
| 198 | token = match_token(p, tokens, args); |
| 199 | switch (token) { |
| 200 | case Opt_bs: |
| 201 | if (match_int(&args[0], &n)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 202 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | if (n != 512 && n != 1024 && n != 2048 |
| 204 | && n != 4096) { |
| 205 | printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); |
| 206 | return 0; |
| 207 | } |
| 208 | *blocksize = n; |
| 209 | break; |
| 210 | case Opt_mode: |
| 211 | if (match_octal(&args[0], &option)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 212 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | *mode = option & 0777; |
| 214 | *mount_opts |= SF_SETMODE; |
| 215 | break; |
| 216 | case Opt_mufs: |
| 217 | *mount_opts |= SF_MUFS; |
| 218 | break; |
| 219 | case Opt_prefix: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | *prefix = match_strdup(&args[0]); |
| 221 | if (!*prefix) |
| 222 | return 0; |
| 223 | *mount_opts |= SF_PREFIX; |
| 224 | break; |
| 225 | case Opt_protect: |
| 226 | *mount_opts |= SF_IMMUTABLE; |
| 227 | break; |
| 228 | case Opt_reserved: |
| 229 | if (match_int(&args[0], reserved)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 230 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | break; |
| 232 | case Opt_root: |
| 233 | if (match_int(&args[0], root)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 234 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | break; |
| 236 | case Opt_setgid: |
| 237 | if (match_int(&args[0], &option)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 238 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | *gid = option; |
| 240 | *mount_opts |= SF_SETGID; |
| 241 | break; |
| 242 | case Opt_setuid: |
| 243 | if (match_int(&args[0], &option)) |
Al Viro | 217686e | 2010-01-24 00:06:22 -0500 | [diff] [blame] | 244 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | *uid = option; |
| 246 | *mount_opts |= SF_SETUID; |
| 247 | break; |
| 248 | case Opt_verbose: |
| 249 | *mount_opts |= SF_VERBOSE; |
| 250 | break; |
| 251 | case Opt_volume: { |
| 252 | char *vol = match_strdup(&args[0]); |
Jim Meyering | 6db27dd | 2008-04-29 00:59:06 -0700 | [diff] [blame] | 253 | if (!vol) |
| 254 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | strlcpy(volume, vol, 32); |
| 256 | kfree(vol); |
| 257 | break; |
| 258 | } |
| 259 | case Opt_ignore: |
| 260 | /* Silently ignore the quota options */ |
| 261 | break; |
| 262 | default: |
| 263 | printk("AFFS: Unrecognized mount option \"%s\" " |
| 264 | "or missing value\n", p); |
| 265 | return 0; |
| 266 | } |
| 267 | } |
| 268 | return 1; |
| 269 | } |
| 270 | |
| 271 | /* This function definitely needs to be split up. Some fine day I'll |
| 272 | * hopefully have the guts to do so. Until then: sorry for the mess. |
| 273 | */ |
| 274 | |
| 275 | static int affs_fill_super(struct super_block *sb, void *data, int silent) |
| 276 | { |
| 277 | struct affs_sb_info *sbi; |
| 278 | struct buffer_head *root_bh = NULL; |
| 279 | struct buffer_head *boot_bh; |
| 280 | struct inode *root_inode = NULL; |
| 281 | s32 root_block; |
| 282 | int size, blocksize; |
| 283 | u32 chksum; |
| 284 | int num_bm; |
| 285 | int i, j; |
| 286 | s32 key; |
| 287 | uid_t uid; |
| 288 | gid_t gid; |
| 289 | int reserved; |
| 290 | unsigned long mount_flags; |
| 291 | int tmp_flags; /* fix remount prototype... */ |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 292 | u8 sig[4]; |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 293 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 295 | save_mount_options(sb, data); |
| 296 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
| 298 | |
| 299 | sb->s_magic = AFFS_SUPER_MAGIC; |
| 300 | sb->s_op = &affs_sops; |
| 301 | sb->s_flags |= MS_NODIRATIME; |
| 302 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 303 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | if (!sbi) |
| 305 | return -ENOMEM; |
Jan Blunck | 74c4142 | 2010-08-15 22:52:36 +0200 | [diff] [blame] | 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | sb->s_fs_info = sbi; |
Matthias Kaehlcke | 7d135a5 | 2008-07-25 19:44:51 -0700 | [diff] [blame] | 308 | mutex_init(&sbi->s_bmlock); |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 309 | spin_lock_init(&sbi->symlink_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, |
| 312 | &blocksize,&sbi->s_prefix, |
| 313 | sbi->s_volume, &mount_flags)) { |
| 314 | printk(KERN_ERR "AFFS: Error parsing options\n"); |
Al Viro | afc70ed | 2010-01-23 23:38:27 -0500 | [diff] [blame] | 315 | kfree(sbi->s_prefix); |
| 316 | kfree(sbi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | return -EINVAL; |
| 318 | } |
| 319 | /* N.B. after this point s_prefix must be released */ |
| 320 | |
| 321 | sbi->s_flags = mount_flags; |
| 322 | sbi->s_mode = i; |
| 323 | sbi->s_uid = uid; |
| 324 | sbi->s_gid = gid; |
| 325 | sbi->s_reserved= reserved; |
| 326 | |
| 327 | /* Get the size of the device in 512-byte blocks. |
| 328 | * If we later see that the partition uses bigger |
| 329 | * blocks, we will have to change it. |
| 330 | */ |
| 331 | |
| 332 | size = sb->s_bdev->bd_inode->i_size >> 9; |
| 333 | pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); |
| 334 | |
| 335 | affs_set_blocksize(sb, PAGE_SIZE); |
| 336 | /* Try to find root block. Its location depends on the block size. */ |
| 337 | |
| 338 | i = 512; |
| 339 | j = 4096; |
| 340 | if (blocksize > 0) { |
| 341 | i = j = blocksize; |
| 342 | size = size / (blocksize / 512); |
| 343 | } |
| 344 | for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { |
| 345 | sbi->s_root_block = root_block; |
| 346 | if (root_block < 0) |
| 347 | sbi->s_root_block = (reserved + size - 1) / 2; |
| 348 | pr_debug("AFFS: setting blocksize to %d\n", blocksize); |
| 349 | affs_set_blocksize(sb, blocksize); |
| 350 | sbi->s_partition_size = size; |
| 351 | |
| 352 | /* The root block location that was calculated above is not |
| 353 | * correct if the partition size is an odd number of 512- |
| 354 | * byte blocks, which will be rounded down to a number of |
| 355 | * 1024-byte blocks, and if there were an even number of |
| 356 | * reserved blocks. Ideally, all partition checkers should |
| 357 | * report the real number of blocks of the real blocksize, |
| 358 | * but since this just cannot be done, we have to try to |
| 359 | * find the root block anyways. In the above case, it is one |
| 360 | * block behind the calculated one. So we check this one, too. |
| 361 | */ |
| 362 | for (num_bm = 0; num_bm < 2; num_bm++) { |
| 363 | pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " |
| 364 | "size=%d, reserved=%d\n", |
| 365 | sb->s_id, |
| 366 | sbi->s_root_block + num_bm, |
| 367 | blocksize, size, reserved); |
| 368 | root_bh = affs_bread(sb, sbi->s_root_block + num_bm); |
| 369 | if (!root_bh) |
| 370 | continue; |
| 371 | if (!affs_checksum_block(sb, root_bh) && |
| 372 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && |
| 373 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { |
| 374 | sbi->s_hashsize = blocksize / 4 - 56; |
| 375 | sbi->s_root_block += num_bm; |
| 376 | key = 1; |
| 377 | goto got_root; |
| 378 | } |
| 379 | affs_brelse(root_bh); |
| 380 | root_bh = NULL; |
| 381 | } |
| 382 | } |
| 383 | if (!silent) |
| 384 | printk(KERN_ERR "AFFS: No valid root block on device %s\n", |
| 385 | sb->s_id); |
| 386 | goto out_error; |
| 387 | |
| 388 | /* N.B. after this point bh must be released */ |
| 389 | got_root: |
| 390 | root_block = sbi->s_root_block; |
| 391 | |
| 392 | /* Find out which kind of FS we have */ |
| 393 | boot_bh = sb_bread(sb, 0); |
| 394 | if (!boot_bh) { |
| 395 | printk(KERN_ERR "AFFS: Cannot read boot block\n"); |
| 396 | goto out_error; |
| 397 | } |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 398 | memcpy(sig, boot_bh->b_data, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | brelse(boot_bh); |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 400 | chksum = be32_to_cpu(*(__be32 *)sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | /* Dircache filesystems are compatible with non-dircache ones |
| 403 | * when reading. As long as they aren't supported, writing is |
| 404 | * not recommended. |
| 405 | */ |
| 406 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS |
| 407 | || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { |
| 408 | printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", |
| 409 | sb->s_id); |
| 410 | sb->s_flags |= MS_RDONLY; |
| 411 | } |
| 412 | switch (chksum) { |
| 413 | case MUFS_FS: |
| 414 | case MUFS_INTLFFS: |
| 415 | case MUFS_DCFFS: |
| 416 | sbi->s_flags |= SF_MUFS; |
| 417 | /* fall thru */ |
| 418 | case FS_INTLFFS: |
| 419 | case FS_DCFFS: |
| 420 | sbi->s_flags |= SF_INTL; |
| 421 | break; |
| 422 | case MUFS_FFS: |
| 423 | sbi->s_flags |= SF_MUFS; |
| 424 | break; |
| 425 | case FS_FFS: |
| 426 | break; |
| 427 | case MUFS_OFS: |
| 428 | sbi->s_flags |= SF_MUFS; |
| 429 | /* fall thru */ |
| 430 | case FS_OFS: |
| 431 | sbi->s_flags |= SF_OFS; |
| 432 | sb->s_flags |= MS_NOEXEC; |
| 433 | break; |
| 434 | case MUFS_DCOFS: |
| 435 | case MUFS_INTLOFS: |
| 436 | sbi->s_flags |= SF_MUFS; |
| 437 | case FS_DCOFS: |
| 438 | case FS_INTLOFS: |
| 439 | sbi->s_flags |= SF_INTL | SF_OFS; |
| 440 | sb->s_flags |= MS_NOEXEC; |
| 441 | break; |
| 442 | default: |
| 443 | printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", |
| 444 | sb->s_id, chksum); |
| 445 | goto out_error; |
| 446 | } |
| 447 | |
| 448 | if (mount_flags & SF_VERBOSE) { |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 449 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
| 450 | printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", |
| 451 | len > 31 ? 31 : len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 453 | sig, sig[3] + '0', blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | sb->s_flags |= MS_NODEV | MS_NOSUID; |
| 457 | |
| 458 | sbi->s_data_blksize = sb->s_blocksize; |
| 459 | if (sbi->s_flags & SF_OFS) |
| 460 | sbi->s_data_blksize -= 24; |
| 461 | |
| 462 | /* Keep super block in cache */ |
| 463 | sbi->s_root_bh = root_bh; |
| 464 | /* N.B. after this point s_root_bh must be released */ |
| 465 | |
| 466 | tmp_flags = sb->s_flags; |
| 467 | if (affs_init_bitmap(sb, &tmp_flags)) |
| 468 | goto out_error; |
| 469 | sb->s_flags = tmp_flags; |
| 470 | |
| 471 | /* set up enough so that it can read an inode */ |
| 472 | |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 473 | root_inode = affs_iget(sb, root_block); |
| 474 | if (IS_ERR(root_inode)) { |
| 475 | ret = PTR_ERR(root_inode); |
| 476 | goto out_error_noinode; |
| 477 | } |
| 478 | |
Al Viro | a129880 | 2011-01-12 16:45:19 -0500 | [diff] [blame] | 479 | if (AFFS_SB(sb)->s_flags & SF_INTL) |
| 480 | sb->s_d_op = &affs_intl_dentry_operations; |
| 481 | else |
| 482 | sb->s_d_op = &affs_dentry_operations; |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | sb->s_root = d_alloc_root(root_inode); |
| 485 | if (!sb->s_root) { |
| 486 | printk(KERN_ERR "AFFS: Get root inode failed\n"); |
| 487 | goto out_error; |
| 488 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); |
| 491 | return 0; |
| 492 | |
| 493 | /* |
| 494 | * Begin the cascaded cleanup ... |
| 495 | */ |
| 496 | out_error: |
| 497 | if (root_inode) |
| 498 | iput(root_inode); |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 499 | out_error_noinode: |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 500 | kfree(sbi->s_bitmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | affs_brelse(root_bh); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 502 | kfree(sbi->s_prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | kfree(sbi); |
| 504 | sb->s_fs_info = NULL; |
David Howells | 210f855 | 2008-02-07 00:15:29 -0800 | [diff] [blame] | 505 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | static int |
| 509 | affs_remount(struct super_block *sb, int *flags, char *data) |
| 510 | { |
| 511 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 512 | int blocksize; |
| 513 | uid_t uid; |
| 514 | gid_t gid; |
| 515 | int mode; |
| 516 | int reserved; |
| 517 | int root_block; |
| 518 | unsigned long mount_flags; |
| 519 | int res = 0; |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 520 | char *new_opts = kstrdup(data, GFP_KERNEL); |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 521 | char volume[32]; |
| 522 | char *prefix = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
| 524 | pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); |
| 525 | |
| 526 | *flags |= MS_NODIRATIME; |
| 527 | |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 528 | memcpy(volume, sbi->s_volume, 32); |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 529 | if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 530 | &blocksize, &prefix, volume, |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 531 | &mount_flags)) { |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 532 | kfree(prefix); |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 533 | kfree(new_opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | return -EINVAL; |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 535 | } |
Jan Blunck | 74c4142 | 2010-08-15 22:52:36 +0200 | [diff] [blame] | 536 | |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 537 | replace_mount_options(sb, new_opts); |
Miklos Szeredi | e9b3961 | 2008-02-08 04:21:36 -0800 | [diff] [blame] | 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | sbi->s_flags = mount_flags; |
| 540 | sbi->s_mode = mode; |
| 541 | sbi->s_uid = uid; |
| 542 | sbi->s_gid = gid; |
Al Viro | 2933392 | 2010-01-24 00:04:07 -0500 | [diff] [blame] | 543 | /* protect against readers */ |
| 544 | spin_lock(&sbi->symlink_lock); |
| 545 | if (prefix) { |
| 546 | kfree(sbi->s_prefix); |
| 547 | sbi->s_prefix = prefix; |
| 548 | } |
| 549 | memcpy(sbi->s_volume, volume, 32); |
| 550 | spin_unlock(&sbi->symlink_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Jan Blunck | 74c4142 | 2010-08-15 22:52:36 +0200 | [diff] [blame] | 552 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | return 0; |
Jan Blunck | 74c4142 | 2010-08-15 22:52:36 +0200 | [diff] [blame] | 554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | if (*flags & MS_RDONLY) { |
Artem Bityutskiy | 669d5f1 | 2010-07-05 15:14:59 +0300 | [diff] [blame] | 556 | affs_write_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | affs_free_bitmap(sb); |
| 558 | } else |
| 559 | res = affs_init_bitmap(sb, flags); |
| 560 | |
| 561 | return res; |
| 562 | } |
| 563 | |
| 564 | static int |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 565 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 567 | struct super_block *sb = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | int free; |
Coly Li | a6a2a73 | 2009-04-02 16:59:32 -0700 | [diff] [blame] | 569 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
| 571 | pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, |
| 572 | AFFS_SB(sb)->s_reserved); |
| 573 | |
| 574 | free = affs_count_free_blocks(sb); |
| 575 | buf->f_type = AFFS_SUPER_MAGIC; |
| 576 | buf->f_bsize = sb->s_blocksize; |
| 577 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
| 578 | buf->f_bfree = free; |
| 579 | buf->f_bavail = free; |
Coly Li | a6a2a73 | 2009-04-02 16:59:32 -0700 | [diff] [blame] | 580 | buf->f_fsid.val[0] = (u32)id; |
| 581 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 582 | buf->f_namelen = 30; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | return 0; |
| 584 | } |
| 585 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 586 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
| 587 | int flags, const char *dev_name, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 589 | return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | } |
| 591 | |
| 592 | static struct file_system_type affs_fs_type = { |
| 593 | .owner = THIS_MODULE, |
| 594 | .name = "affs", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 595 | .mount = affs_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | .kill_sb = kill_block_super, |
| 597 | .fs_flags = FS_REQUIRES_DEV, |
| 598 | }; |
| 599 | |
| 600 | static int __init init_affs_fs(void) |
| 601 | { |
| 602 | int err = init_inodecache(); |
| 603 | if (err) |
| 604 | goto out1; |
| 605 | err = register_filesystem(&affs_fs_type); |
| 606 | if (err) |
| 607 | goto out; |
| 608 | return 0; |
| 609 | out: |
| 610 | destroy_inodecache(); |
| 611 | out1: |
| 612 | return err; |
| 613 | } |
| 614 | |
| 615 | static void __exit exit_affs_fs(void) |
| 616 | { |
| 617 | unregister_filesystem(&affs_fs_type); |
| 618 | destroy_inodecache(); |
| 619 | } |
| 620 | |
| 621 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); |
| 622 | MODULE_LICENSE("GPL"); |
| 623 | |
| 624 | module_init(init_affs_fs) |
| 625 | module_exit(exit_affs_fs) |