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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include "affs.h" |
| 20 | |
| 21 | extern struct timezone sys_tz; |
| 22 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 23 | static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | static int affs_remount (struct super_block *sb, int *flags, char *data); |
| 25 | |
| 26 | static void |
| 27 | affs_put_super(struct super_block *sb) |
| 28 | { |
| 29 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 30 | pr_debug("AFFS: put_super()\n"); |
| 31 | |
| 32 | if (!(sb->s_flags & MS_RDONLY)) { |
| 33 | AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1); |
| 34 | secs_to_datestamp(get_seconds(), |
| 35 | &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); |
| 36 | affs_fix_checksum(sb, sbi->s_root_bh); |
| 37 | mark_buffer_dirty(sbi->s_root_bh); |
| 38 | } |
| 39 | |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 40 | kfree(sbi->s_prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | affs_free_bitmap(sb); |
| 42 | affs_brelse(sbi->s_root_bh); |
| 43 | kfree(sbi); |
| 44 | sb->s_fs_info = NULL; |
| 45 | return; |
| 46 | } |
| 47 | |
| 48 | static void |
| 49 | affs_write_super(struct super_block *sb) |
| 50 | { |
| 51 | int clean = 2; |
| 52 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 53 | |
| 54 | if (!(sb->s_flags & MS_RDONLY)) { |
| 55 | // if (sbi->s_bitmap[i].bm_bh) { |
| 56 | // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) { |
| 57 | // clean = 0; |
| 58 | AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean); |
| 59 | secs_to_datestamp(get_seconds(), |
| 60 | &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); |
| 61 | affs_fix_checksum(sb, sbi->s_root_bh); |
| 62 | mark_buffer_dirty(sbi->s_root_bh); |
| 63 | sb->s_dirt = !clean; /* redo until bitmap synced */ |
| 64 | } else |
| 65 | sb->s_dirt = 0; |
| 66 | |
| 67 | pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean); |
| 68 | } |
| 69 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 70 | static struct kmem_cache * affs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | static struct inode *affs_alloc_inode(struct super_block *sb) |
| 73 | { |
| 74 | struct affs_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 75 | ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | if (!ei) |
| 77 | return NULL; |
| 78 | ei->vfs_inode.i_version = 1; |
| 79 | return &ei->vfs_inode; |
| 80 | } |
| 81 | |
| 82 | static void affs_destroy_inode(struct inode *inode) |
| 83 | { |
| 84 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
| 85 | } |
| 86 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 87 | static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
| 89 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
| 90 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 91 | init_MUTEX(&ei->i_link_lock); |
| 92 | init_MUTEX(&ei->i_ext_lock); |
| 93 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | static int init_inodecache(void) |
| 97 | { |
| 98 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", |
| 99 | sizeof(struct affs_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 100 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 101 | SLAB_MEM_SPREAD), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | init_once, NULL); |
| 103 | if (affs_inode_cachep == NULL) |
| 104 | return -ENOMEM; |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static void destroy_inodecache(void) |
| 109 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 110 | kmem_cache_destroy(affs_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 113 | static const struct super_operations affs_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | .alloc_inode = affs_alloc_inode, |
| 115 | .destroy_inode = affs_destroy_inode, |
| 116 | .read_inode = affs_read_inode, |
| 117 | .write_inode = affs_write_inode, |
| 118 | .put_inode = affs_put_inode, |
Christoph Hellwig | 2be3c79 | 2007-02-20 13:58:11 -0800 | [diff] [blame] | 119 | .drop_inode = affs_drop_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | .delete_inode = affs_delete_inode, |
| 121 | .clear_inode = affs_clear_inode, |
| 122 | .put_super = affs_put_super, |
| 123 | .write_super = affs_write_super, |
| 124 | .statfs = affs_statfs, |
| 125 | .remount_fs = affs_remount, |
| 126 | }; |
| 127 | |
| 128 | enum { |
| 129 | Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, |
| 130 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, |
| 131 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, |
| 132 | }; |
| 133 | |
| 134 | static match_table_t tokens = { |
| 135 | {Opt_bs, "bs=%u"}, |
| 136 | {Opt_mode, "mode=%o"}, |
| 137 | {Opt_mufs, "mufs"}, |
| 138 | {Opt_prefix, "prefix=%s"}, |
| 139 | {Opt_protect, "protect"}, |
| 140 | {Opt_reserved, "reserved=%u"}, |
| 141 | {Opt_root, "root=%u"}, |
| 142 | {Opt_setgid, "setgid=%u"}, |
| 143 | {Opt_setuid, "setuid=%u"}, |
| 144 | {Opt_verbose, "verbose"}, |
| 145 | {Opt_volume, "volume=%s"}, |
| 146 | {Opt_ignore, "grpquota"}, |
| 147 | {Opt_ignore, "noquota"}, |
| 148 | {Opt_ignore, "quota"}, |
| 149 | {Opt_ignore, "usrquota"}, |
| 150 | {Opt_err, NULL}, |
| 151 | }; |
| 152 | |
| 153 | static int |
| 154 | parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, |
| 155 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) |
| 156 | { |
| 157 | char *p; |
| 158 | substring_t args[MAX_OPT_ARGS]; |
| 159 | |
| 160 | /* Fill in defaults */ |
| 161 | |
| 162 | *uid = current->uid; |
| 163 | *gid = current->gid; |
| 164 | *reserved = 2; |
| 165 | *root = -1; |
| 166 | *blocksize = -1; |
| 167 | volume[0] = ':'; |
| 168 | volume[1] = 0; |
| 169 | *mount_opts = 0; |
| 170 | if (!options) |
| 171 | return 1; |
| 172 | |
| 173 | while ((p = strsep(&options, ",")) != NULL) { |
| 174 | int token, n, option; |
| 175 | if (!*p) |
| 176 | continue; |
| 177 | |
| 178 | token = match_token(p, tokens, args); |
| 179 | switch (token) { |
| 180 | case Opt_bs: |
| 181 | if (match_int(&args[0], &n)) |
| 182 | return -EINVAL; |
| 183 | if (n != 512 && n != 1024 && n != 2048 |
| 184 | && n != 4096) { |
| 185 | printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); |
| 186 | return 0; |
| 187 | } |
| 188 | *blocksize = n; |
| 189 | break; |
| 190 | case Opt_mode: |
| 191 | if (match_octal(&args[0], &option)) |
| 192 | return 1; |
| 193 | *mode = option & 0777; |
| 194 | *mount_opts |= SF_SETMODE; |
| 195 | break; |
| 196 | case Opt_mufs: |
| 197 | *mount_opts |= SF_MUFS; |
| 198 | break; |
| 199 | case Opt_prefix: |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 200 | /* Free any previous prefix */ |
| 201 | kfree(*prefix); |
| 202 | *prefix = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | *prefix = match_strdup(&args[0]); |
| 204 | if (!*prefix) |
| 205 | return 0; |
| 206 | *mount_opts |= SF_PREFIX; |
| 207 | break; |
| 208 | case Opt_protect: |
| 209 | *mount_opts |= SF_IMMUTABLE; |
| 210 | break; |
| 211 | case Opt_reserved: |
| 212 | if (match_int(&args[0], reserved)) |
| 213 | return 1; |
| 214 | break; |
| 215 | case Opt_root: |
| 216 | if (match_int(&args[0], root)) |
| 217 | return 1; |
| 218 | break; |
| 219 | case Opt_setgid: |
| 220 | if (match_int(&args[0], &option)) |
| 221 | return 1; |
| 222 | *gid = option; |
| 223 | *mount_opts |= SF_SETGID; |
| 224 | break; |
| 225 | case Opt_setuid: |
| 226 | if (match_int(&args[0], &option)) |
| 227 | return -EINVAL; |
| 228 | *uid = option; |
| 229 | *mount_opts |= SF_SETUID; |
| 230 | break; |
| 231 | case Opt_verbose: |
| 232 | *mount_opts |= SF_VERBOSE; |
| 233 | break; |
| 234 | case Opt_volume: { |
| 235 | char *vol = match_strdup(&args[0]); |
| 236 | strlcpy(volume, vol, 32); |
| 237 | kfree(vol); |
| 238 | break; |
| 239 | } |
| 240 | case Opt_ignore: |
| 241 | /* Silently ignore the quota options */ |
| 242 | break; |
| 243 | default: |
| 244 | printk("AFFS: Unrecognized mount option \"%s\" " |
| 245 | "or missing value\n", p); |
| 246 | return 0; |
| 247 | } |
| 248 | } |
| 249 | return 1; |
| 250 | } |
| 251 | |
| 252 | /* This function definitely needs to be split up. Some fine day I'll |
| 253 | * hopefully have the guts to do so. Until then: sorry for the mess. |
| 254 | */ |
| 255 | |
| 256 | static int affs_fill_super(struct super_block *sb, void *data, int silent) |
| 257 | { |
| 258 | struct affs_sb_info *sbi; |
| 259 | struct buffer_head *root_bh = NULL; |
| 260 | struct buffer_head *boot_bh; |
| 261 | struct inode *root_inode = NULL; |
| 262 | s32 root_block; |
| 263 | int size, blocksize; |
| 264 | u32 chksum; |
| 265 | int num_bm; |
| 266 | int i, j; |
| 267 | s32 key; |
| 268 | uid_t uid; |
| 269 | gid_t gid; |
| 270 | int reserved; |
| 271 | unsigned long mount_flags; |
| 272 | int tmp_flags; /* fix remount prototype... */ |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 273 | u8 sig[4]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
| 276 | |
| 277 | sb->s_magic = AFFS_SUPER_MAGIC; |
| 278 | sb->s_op = &affs_sops; |
| 279 | sb->s_flags |= MS_NODIRATIME; |
| 280 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 281 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | if (!sbi) |
| 283 | return -ENOMEM; |
| 284 | sb->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | init_MUTEX(&sbi->s_bmlock); |
| 286 | |
| 287 | if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, |
| 288 | &blocksize,&sbi->s_prefix, |
| 289 | sbi->s_volume, &mount_flags)) { |
| 290 | printk(KERN_ERR "AFFS: Error parsing options\n"); |
| 291 | return -EINVAL; |
| 292 | } |
| 293 | /* N.B. after this point s_prefix must be released */ |
| 294 | |
| 295 | sbi->s_flags = mount_flags; |
| 296 | sbi->s_mode = i; |
| 297 | sbi->s_uid = uid; |
| 298 | sbi->s_gid = gid; |
| 299 | sbi->s_reserved= reserved; |
| 300 | |
| 301 | /* Get the size of the device in 512-byte blocks. |
| 302 | * If we later see that the partition uses bigger |
| 303 | * blocks, we will have to change it. |
| 304 | */ |
| 305 | |
| 306 | size = sb->s_bdev->bd_inode->i_size >> 9; |
| 307 | pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); |
| 308 | |
| 309 | affs_set_blocksize(sb, PAGE_SIZE); |
| 310 | /* Try to find root block. Its location depends on the block size. */ |
| 311 | |
| 312 | i = 512; |
| 313 | j = 4096; |
| 314 | if (blocksize > 0) { |
| 315 | i = j = blocksize; |
| 316 | size = size / (blocksize / 512); |
| 317 | } |
| 318 | for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { |
| 319 | sbi->s_root_block = root_block; |
| 320 | if (root_block < 0) |
| 321 | sbi->s_root_block = (reserved + size - 1) / 2; |
| 322 | pr_debug("AFFS: setting blocksize to %d\n", blocksize); |
| 323 | affs_set_blocksize(sb, blocksize); |
| 324 | sbi->s_partition_size = size; |
| 325 | |
| 326 | /* The root block location that was calculated above is not |
| 327 | * correct if the partition size is an odd number of 512- |
| 328 | * byte blocks, which will be rounded down to a number of |
| 329 | * 1024-byte blocks, and if there were an even number of |
| 330 | * reserved blocks. Ideally, all partition checkers should |
| 331 | * report the real number of blocks of the real blocksize, |
| 332 | * but since this just cannot be done, we have to try to |
| 333 | * find the root block anyways. In the above case, it is one |
| 334 | * block behind the calculated one. So we check this one, too. |
| 335 | */ |
| 336 | for (num_bm = 0; num_bm < 2; num_bm++) { |
| 337 | pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " |
| 338 | "size=%d, reserved=%d\n", |
| 339 | sb->s_id, |
| 340 | sbi->s_root_block + num_bm, |
| 341 | blocksize, size, reserved); |
| 342 | root_bh = affs_bread(sb, sbi->s_root_block + num_bm); |
| 343 | if (!root_bh) |
| 344 | continue; |
| 345 | if (!affs_checksum_block(sb, root_bh) && |
| 346 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && |
| 347 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { |
| 348 | sbi->s_hashsize = blocksize / 4 - 56; |
| 349 | sbi->s_root_block += num_bm; |
| 350 | key = 1; |
| 351 | goto got_root; |
| 352 | } |
| 353 | affs_brelse(root_bh); |
| 354 | root_bh = NULL; |
| 355 | } |
| 356 | } |
| 357 | if (!silent) |
| 358 | printk(KERN_ERR "AFFS: No valid root block on device %s\n", |
| 359 | sb->s_id); |
| 360 | goto out_error; |
| 361 | |
| 362 | /* N.B. after this point bh must be released */ |
| 363 | got_root: |
| 364 | root_block = sbi->s_root_block; |
| 365 | |
| 366 | /* Find out which kind of FS we have */ |
| 367 | boot_bh = sb_bread(sb, 0); |
| 368 | if (!boot_bh) { |
| 369 | printk(KERN_ERR "AFFS: Cannot read boot block\n"); |
| 370 | goto out_error; |
| 371 | } |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 372 | memcpy(sig, boot_bh->b_data, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | brelse(boot_bh); |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 374 | chksum = be32_to_cpu(*(__be32 *)sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
| 376 | /* Dircache filesystems are compatible with non-dircache ones |
| 377 | * when reading. As long as they aren't supported, writing is |
| 378 | * not recommended. |
| 379 | */ |
| 380 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS |
| 381 | || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { |
| 382 | printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", |
| 383 | sb->s_id); |
| 384 | sb->s_flags |= MS_RDONLY; |
| 385 | } |
| 386 | switch (chksum) { |
| 387 | case MUFS_FS: |
| 388 | case MUFS_INTLFFS: |
| 389 | case MUFS_DCFFS: |
| 390 | sbi->s_flags |= SF_MUFS; |
| 391 | /* fall thru */ |
| 392 | case FS_INTLFFS: |
| 393 | case FS_DCFFS: |
| 394 | sbi->s_flags |= SF_INTL; |
| 395 | break; |
| 396 | case MUFS_FFS: |
| 397 | sbi->s_flags |= SF_MUFS; |
| 398 | break; |
| 399 | case FS_FFS: |
| 400 | break; |
| 401 | case MUFS_OFS: |
| 402 | sbi->s_flags |= SF_MUFS; |
| 403 | /* fall thru */ |
| 404 | case FS_OFS: |
| 405 | sbi->s_flags |= SF_OFS; |
| 406 | sb->s_flags |= MS_NOEXEC; |
| 407 | break; |
| 408 | case MUFS_DCOFS: |
| 409 | case MUFS_INTLOFS: |
| 410 | sbi->s_flags |= SF_MUFS; |
| 411 | case FS_DCOFS: |
| 412 | case FS_INTLOFS: |
| 413 | sbi->s_flags |= SF_INTL | SF_OFS; |
| 414 | sb->s_flags |= MS_NOEXEC; |
| 415 | break; |
| 416 | default: |
| 417 | printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", |
| 418 | sb->s_id, chksum); |
| 419 | goto out_error; |
| 420 | } |
| 421 | |
| 422 | if (mount_flags & SF_VERBOSE) { |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 423 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
| 424 | printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", |
| 425 | len > 31 ? 31 : len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
Al Viro | 2b943cf | 2006-06-25 05:49:08 -0700 | [diff] [blame] | 427 | sig, sig[3] + '0', blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | sb->s_flags |= MS_NODEV | MS_NOSUID; |
| 431 | |
| 432 | sbi->s_data_blksize = sb->s_blocksize; |
| 433 | if (sbi->s_flags & SF_OFS) |
| 434 | sbi->s_data_blksize -= 24; |
| 435 | |
| 436 | /* Keep super block in cache */ |
| 437 | sbi->s_root_bh = root_bh; |
| 438 | /* N.B. after this point s_root_bh must be released */ |
| 439 | |
| 440 | tmp_flags = sb->s_flags; |
| 441 | if (affs_init_bitmap(sb, &tmp_flags)) |
| 442 | goto out_error; |
| 443 | sb->s_flags = tmp_flags; |
| 444 | |
| 445 | /* set up enough so that it can read an inode */ |
| 446 | |
| 447 | root_inode = iget(sb, root_block); |
| 448 | sb->s_root = d_alloc_root(root_inode); |
| 449 | if (!sb->s_root) { |
| 450 | printk(KERN_ERR "AFFS: Get root inode failed\n"); |
| 451 | goto out_error; |
| 452 | } |
| 453 | sb->s_root->d_op = &affs_dentry_operations; |
| 454 | |
| 455 | pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); |
| 456 | return 0; |
| 457 | |
| 458 | /* |
| 459 | * Begin the cascaded cleanup ... |
| 460 | */ |
| 461 | out_error: |
| 462 | if (root_inode) |
| 463 | iput(root_inode); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 464 | kfree(sbi->s_bitmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | affs_brelse(root_bh); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 466 | kfree(sbi->s_prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | kfree(sbi); |
| 468 | sb->s_fs_info = NULL; |
| 469 | return -EINVAL; |
| 470 | } |
| 471 | |
| 472 | static int |
| 473 | affs_remount(struct super_block *sb, int *flags, char *data) |
| 474 | { |
| 475 | struct affs_sb_info *sbi = AFFS_SB(sb); |
| 476 | int blocksize; |
| 477 | uid_t uid; |
| 478 | gid_t gid; |
| 479 | int mode; |
| 480 | int reserved; |
| 481 | int root_block; |
| 482 | unsigned long mount_flags; |
| 483 | int res = 0; |
| 484 | |
| 485 | pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); |
| 486 | |
| 487 | *flags |= MS_NODIRATIME; |
| 488 | |
| 489 | if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block, |
| 490 | &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags)) |
| 491 | return -EINVAL; |
| 492 | sbi->s_flags = mount_flags; |
| 493 | sbi->s_mode = mode; |
| 494 | sbi->s_uid = uid; |
| 495 | sbi->s_gid = gid; |
| 496 | |
| 497 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 498 | return 0; |
| 499 | if (*flags & MS_RDONLY) { |
| 500 | sb->s_dirt = 1; |
| 501 | while (sb->s_dirt) |
| 502 | affs_write_super(sb); |
| 503 | affs_free_bitmap(sb); |
| 504 | } else |
| 505 | res = affs_init_bitmap(sb, flags); |
| 506 | |
| 507 | return res; |
| 508 | } |
| 509 | |
| 510 | static int |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 511 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 513 | struct super_block *sb = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | int free; |
| 515 | |
| 516 | pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, |
| 517 | AFFS_SB(sb)->s_reserved); |
| 518 | |
| 519 | free = affs_count_free_blocks(sb); |
| 520 | buf->f_type = AFFS_SUPER_MAGIC; |
| 521 | buf->f_bsize = sb->s_blocksize; |
| 522 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; |
| 523 | buf->f_bfree = free; |
| 524 | buf->f_bavail = free; |
| 525 | return 0; |
| 526 | } |
| 527 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 528 | static int affs_get_sb(struct file_system_type *fs_type, |
| 529 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 531 | return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super, |
| 532 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | static struct file_system_type affs_fs_type = { |
| 536 | .owner = THIS_MODULE, |
| 537 | .name = "affs", |
| 538 | .get_sb = affs_get_sb, |
| 539 | .kill_sb = kill_block_super, |
| 540 | .fs_flags = FS_REQUIRES_DEV, |
| 541 | }; |
| 542 | |
| 543 | static int __init init_affs_fs(void) |
| 544 | { |
| 545 | int err = init_inodecache(); |
| 546 | if (err) |
| 547 | goto out1; |
| 548 | err = register_filesystem(&affs_fs_type); |
| 549 | if (err) |
| 550 | goto out; |
| 551 | return 0; |
| 552 | out: |
| 553 | destroy_inodecache(); |
| 554 | out1: |
| 555 | return err; |
| 556 | } |
| 557 | |
| 558 | static void __exit exit_affs_fs(void) |
| 559 | { |
| 560 | unregister_filesystem(&affs_fs_type); |
| 561 | destroy_inodecache(); |
| 562 | } |
| 563 | |
| 564 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); |
| 565 | MODULE_LICENSE("GPL"); |
| 566 | |
| 567 | module_init(init_affs_fs) |
| 568 | module_exit(exit_affs_fs) |