Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/fat/inode.c |
| 3 | * |
| 4 | * Written 1992,1993 by Werner Almesberger |
| 5 | * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner |
| 6 | * Rewritten for the constant inumbers support by Al Viro |
| 7 | * |
| 8 | * Fixes: |
| 9 | * |
| 10 | * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0 |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/time.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/smp_lock.h> |
| 18 | #include <linux/seq_file.h> |
| 19 | #include <linux/msdos_fs.h> |
| 20 | #include <linux/pagemap.h> |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 21 | #include <linux/mpage.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/buffer_head.h> |
| 23 | #include <linux/mount.h> |
| 24 | #include <linux/vfs.h> |
| 25 | #include <linux/parser.h> |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 26 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <asm/unaligned.h> |
| 28 | |
| 29 | #ifndef CONFIG_FAT_DEFAULT_IOCHARSET |
| 30 | /* if user don't select VFAT, this is undefined. */ |
| 31 | #define CONFIG_FAT_DEFAULT_IOCHARSET "" |
| 32 | #endif |
| 33 | |
| 34 | static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; |
| 35 | static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; |
| 36 | |
| 37 | |
| 38 | static int fat_add_cluster(struct inode *inode) |
| 39 | { |
| 40 | int err, cluster; |
| 41 | |
| 42 | err = fat_alloc_clusters(inode, &cluster, 1); |
| 43 | if (err) |
| 44 | return err; |
| 45 | /* FIXME: this cluster should be added after data of this |
| 46 | * cluster is writed */ |
| 47 | err = fat_chain_add(inode, cluster, 1); |
| 48 | if (err) |
| 49 | fat_free_clusters(inode, cluster); |
| 50 | return err; |
| 51 | } |
| 52 | |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 53 | static inline int __fat_get_block(struct inode *inode, sector_t iblock, |
| 54 | unsigned long *max_blocks, |
| 55 | struct buffer_head *bh_result, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | { |
| 57 | struct super_block *sb = inode->i_sb; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 58 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 59 | unsigned long mapped_blocks; |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 60 | sector_t phys; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 61 | int err, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 63 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | if (err) |
| 65 | return err; |
| 66 | if (phys) { |
| 67 | map_bh(bh_result, sb, phys); |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 68 | *max_blocks = min(mapped_blocks, *max_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | return 0; |
| 70 | } |
| 71 | if (!create) |
| 72 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
| 75 | fat_fs_panic(sb, "corrupted file size (i_pos %lld, %lld)", |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 76 | MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | return -EIO; |
| 78 | } |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 79 | |
| 80 | offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); |
| 81 | if (!offset) { |
| 82 | /* TODO: multiple cluster allocation would be desirable. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | err = fat_add_cluster(inode); |
| 84 | if (err) |
| 85 | return err; |
| 86 | } |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 87 | /* available blocks on this cluster */ |
| 88 | mapped_blocks = sbi->sec_per_clus - offset; |
| 89 | |
| 90 | *max_blocks = min(mapped_blocks, *max_blocks); |
| 91 | MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; |
| 92 | |
| 93 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | if (err) |
| 95 | return err; |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 96 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 97 | BUG_ON(!phys); |
| 98 | BUG_ON(*max_blocks != mapped_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | set_buffer_new(bh_result); |
| 100 | map_bh(bh_result, sb, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static int fat_get_block(struct inode *inode, sector_t iblock, |
| 106 | struct buffer_head *bh_result, int create) |
| 107 | { |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 108 | struct super_block *sb = inode->i_sb; |
| 109 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
| 110 | int err; |
| 111 | |
| 112 | err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); |
| 113 | if (err) |
| 114 | return err; |
| 115 | bh_result->b_size = max_blocks << sb->s_blocksize_bits; |
| 116 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 117 | } |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | static int fat_writepage(struct page *page, struct writeback_control *wbc) |
| 120 | { |
| 121 | return block_write_full_page(page, fat_get_block, wbc); |
| 122 | } |
| 123 | |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 124 | static int fat_writepages(struct address_space *mapping, |
| 125 | struct writeback_control *wbc) |
| 126 | { |
| 127 | return mpage_writepages(mapping, wbc, fat_get_block); |
| 128 | } |
| 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | static int fat_readpage(struct file *file, struct page *page) |
| 131 | { |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 132 | return mpage_readpage(page, fat_get_block); |
| 133 | } |
| 134 | |
| 135 | static int fat_readpages(struct file *file, struct address_space *mapping, |
| 136 | struct list_head *pages, unsigned nr_pages) |
| 137 | { |
| 138 | return mpage_readpages(mapping, pages, nr_pages, fat_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | static int fat_prepare_write(struct file *file, struct page *page, |
| 142 | unsigned from, unsigned to) |
| 143 | { |
| 144 | return cont_prepare_write(page, from, to, fat_get_block, |
| 145 | &MSDOS_I(page->mapping->host)->mmu_private); |
| 146 | } |
| 147 | |
OGAWA Hirofumi | ef40226 | 2005-09-16 19:28:13 -0700 | [diff] [blame] | 148 | static int fat_commit_write(struct file *file, struct page *page, |
| 149 | unsigned from, unsigned to) |
| 150 | { |
| 151 | struct inode *inode = page->mapping->host; |
| 152 | int err = generic_commit_write(file, page, from, to); |
| 153 | if (!err && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { |
| 154 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
| 155 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; |
| 156 | mark_inode_dirty(inode); |
| 157 | } |
| 158 | return err; |
| 159 | } |
| 160 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 161 | static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, |
| 162 | const struct iovec *iov, |
| 163 | loff_t offset, unsigned long nr_segs) |
| 164 | { |
| 165 | struct file *file = iocb->ki_filp; |
| 166 | struct inode *inode = file->f_mapping->host; |
| 167 | |
| 168 | if (rw == WRITE) { |
| 169 | /* |
| 170 | * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(), |
| 171 | * so we need to update the ->mmu_private to block boundary. |
| 172 | * |
| 173 | * But we must fill the remaining area or hole by nul for |
| 174 | * updating ->mmu_private. |
| 175 | */ |
| 176 | loff_t size = offset + iov_length(iov, nr_segs); |
| 177 | if (MSDOS_I(inode)->mmu_private < size) |
| 178 | return -EINVAL; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * FAT need to use the DIO_LOCKING for avoiding the race |
| 183 | * condition of fat_get_block() and ->truncate(). |
| 184 | */ |
| 185 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 186 | offset, nr_segs, fat_get_block, NULL); |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 187 | } |
| 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
| 190 | { |
| 191 | return generic_block_bmap(mapping, block, fat_get_block); |
| 192 | } |
| 193 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 194 | static const struct address_space_operations fat_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | .readpage = fat_readpage, |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 196 | .readpages = fat_readpages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | .writepage = fat_writepage, |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 198 | .writepages = fat_writepages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | .sync_page = block_sync_page, |
| 200 | .prepare_write = fat_prepare_write, |
OGAWA Hirofumi | ef40226 | 2005-09-16 19:28:13 -0700 | [diff] [blame] | 201 | .commit_write = fat_commit_write, |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 202 | .direct_IO = fat_direct_IO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | .bmap = _fat_bmap |
| 204 | }; |
| 205 | |
| 206 | /* |
| 207 | * New FAT inode stuff. We do the following: |
| 208 | * a) i_ino is constant and has nothing with on-disk location. |
| 209 | * b) FAT manages its own cache of directory entries. |
| 210 | * c) *This* cache is indexed by on-disk location. |
| 211 | * d) inode has an associated directory entry, all right, but |
| 212 | * it may be unhashed. |
| 213 | * e) currently entries are stored within struct inode. That should |
| 214 | * change. |
| 215 | * f) we deal with races in the following way: |
| 216 | * 1. readdir() and lookup() do FAT-dir-cache lookup. |
| 217 | * 2. rename() unhashes the F-d-c entry and rehashes it in |
| 218 | * a new place. |
| 219 | * 3. unlink() and rmdir() unhash F-d-c entry. |
| 220 | * 4. fat_write_inode() checks whether the thing is unhashed. |
| 221 | * If it is we silently return. If it isn't we do bread(), |
| 222 | * check if the location is still valid and retry if it |
| 223 | * isn't. Otherwise we do changes. |
| 224 | * 5. Spinlock is used to protect hash/unhash/location check/lookup |
| 225 | * 6. fat_clear_inode() unhashes the F-d-c entry. |
| 226 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry |
| 227 | * and consider negative result as cache miss. |
| 228 | */ |
| 229 | |
| 230 | static void fat_hash_init(struct super_block *sb) |
| 231 | { |
| 232 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 233 | int i; |
| 234 | |
| 235 | spin_lock_init(&sbi->inode_hash_lock); |
| 236 | for (i = 0; i < FAT_HASH_SIZE; i++) |
| 237 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); |
| 238 | } |
| 239 | |
| 240 | static inline unsigned long fat_hash(struct super_block *sb, loff_t i_pos) |
| 241 | { |
| 242 | unsigned long tmp = (unsigned long)i_pos | (unsigned long) sb; |
| 243 | tmp = tmp + (tmp >> FAT_HASH_BITS) + (tmp >> FAT_HASH_BITS * 2); |
| 244 | return tmp & FAT_HASH_MASK; |
| 245 | } |
| 246 | |
| 247 | void fat_attach(struct inode *inode, loff_t i_pos) |
| 248 | { |
| 249 | struct super_block *sb = inode->i_sb; |
| 250 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 251 | |
| 252 | spin_lock(&sbi->inode_hash_lock); |
| 253 | MSDOS_I(inode)->i_pos = i_pos; |
| 254 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, |
| 255 | sbi->inode_hashtable + fat_hash(sb, i_pos)); |
| 256 | spin_unlock(&sbi->inode_hash_lock); |
| 257 | } |
| 258 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 259 | EXPORT_SYMBOL_GPL(fat_attach); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
| 261 | void fat_detach(struct inode *inode) |
| 262 | { |
| 263 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 264 | spin_lock(&sbi->inode_hash_lock); |
| 265 | MSDOS_I(inode)->i_pos = 0; |
| 266 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); |
| 267 | spin_unlock(&sbi->inode_hash_lock); |
| 268 | } |
| 269 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 270 | EXPORT_SYMBOL_GPL(fat_detach); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
| 272 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) |
| 273 | { |
| 274 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 275 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(sb, i_pos); |
| 276 | struct hlist_node *_p; |
| 277 | struct msdos_inode_info *i; |
| 278 | struct inode *inode = NULL; |
| 279 | |
| 280 | spin_lock(&sbi->inode_hash_lock); |
| 281 | hlist_for_each_entry(i, _p, head, i_fat_hash) { |
| 282 | BUG_ON(i->vfs_inode.i_sb != sb); |
| 283 | if (i->i_pos != i_pos) |
| 284 | continue; |
| 285 | inode = igrab(&i->vfs_inode); |
| 286 | if (inode) |
| 287 | break; |
| 288 | } |
| 289 | spin_unlock(&sbi->inode_hash_lock); |
| 290 | return inode; |
| 291 | } |
| 292 | |
| 293 | static int is_exec(unsigned char *extension) |
| 294 | { |
| 295 | unsigned char *exe_extensions = "EXECOMBAT", *walk; |
| 296 | |
| 297 | for (walk = exe_extensions; *walk; walk += 3) |
| 298 | if (!strncmp(extension, walk, 3)) |
| 299 | return 1; |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | static int fat_calc_dir_size(struct inode *inode) |
| 304 | { |
| 305 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 306 | int ret, fclus, dclus; |
| 307 | |
| 308 | inode->i_size = 0; |
| 309 | if (MSDOS_I(inode)->i_start == 0) |
| 310 | return 0; |
| 311 | |
| 312 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); |
| 313 | if (ret < 0) |
| 314 | return ret; |
| 315 | inode->i_size = (fclus + 1) << sbi->cluster_bits; |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | /* doesn't deal with root inode */ |
| 321 | static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) |
| 322 | { |
| 323 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 324 | int error; |
| 325 | |
| 326 | MSDOS_I(inode)->i_pos = 0; |
| 327 | inode->i_uid = sbi->options.fs_uid; |
| 328 | inode->i_gid = sbi->options.fs_gid; |
| 329 | inode->i_version++; |
| 330 | inode->i_generation = get_seconds(); |
| 331 | |
| 332 | if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { |
| 333 | inode->i_generation &= ~1; |
| 334 | inode->i_mode = MSDOS_MKMODE(de->attr, |
| 335 | S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR; |
| 336 | inode->i_op = sbi->dir_ops; |
| 337 | inode->i_fop = &fat_dir_operations; |
| 338 | |
| 339 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); |
| 340 | if (sbi->fat_bits == 32) |
| 341 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); |
| 342 | |
| 343 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
| 344 | error = fat_calc_dir_size(inode); |
| 345 | if (error < 0) |
| 346 | return error; |
| 347 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 348 | |
| 349 | inode->i_nlink = fat_subdirs(inode); |
| 350 | } else { /* not a directory */ |
| 351 | inode->i_generation |= 1; |
| 352 | inode->i_mode = MSDOS_MKMODE(de->attr, |
| 353 | ((sbi->options.showexec && |
| 354 | !is_exec(de->ext)) |
| 355 | ? S_IRUGO|S_IWUGO : S_IRWXUGO) |
| 356 | & ~sbi->options.fs_fmask) | S_IFREG; |
| 357 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); |
| 358 | if (sbi->fat_bits == 32) |
| 359 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); |
| 360 | |
| 361 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
| 362 | inode->i_size = le32_to_cpu(de->size); |
| 363 | inode->i_op = &fat_file_inode_operations; |
| 364 | inode->i_fop = &fat_file_operations; |
| 365 | inode->i_mapping->a_ops = &fat_aops; |
| 366 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 367 | } |
| 368 | if (de->attr & ATTR_SYS) { |
| 369 | if (sbi->options.sys_immutable) |
| 370 | inode->i_flags |= S_IMMUTABLE; |
| 371 | } |
| 372 | MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
| 374 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 375 | inode->i_mtime.tv_sec = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date)); |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 377 | inode->i_mtime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | if (sbi->options.isvfat) { |
| 379 | int secs = de->ctime_cs / 100; |
| 380 | int csecs = de->ctime_cs % 100; |
| 381 | inode->i_ctime.tv_sec = |
| 382 | date_dos2unix(le16_to_cpu(de->ctime), |
| 383 | le16_to_cpu(de->cdate)) + secs; |
| 384 | inode->i_ctime.tv_nsec = csecs * 10000000; |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 385 | inode->i_atime.tv_sec = |
| 386 | date_dos2unix(le16_to_cpu(0), le16_to_cpu(de->adate)); |
| 387 | inode->i_atime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | } else |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 389 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | struct inode *fat_build_inode(struct super_block *sb, |
| 395 | struct msdos_dir_entry *de, loff_t i_pos) |
| 396 | { |
| 397 | struct inode *inode; |
| 398 | int err; |
| 399 | |
| 400 | inode = fat_iget(sb, i_pos); |
| 401 | if (inode) |
| 402 | goto out; |
| 403 | inode = new_inode(sb); |
| 404 | if (!inode) { |
| 405 | inode = ERR_PTR(-ENOMEM); |
| 406 | goto out; |
| 407 | } |
| 408 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); |
| 409 | inode->i_version = 1; |
| 410 | err = fat_fill_inode(inode, de); |
| 411 | if (err) { |
| 412 | iput(inode); |
| 413 | inode = ERR_PTR(err); |
| 414 | goto out; |
| 415 | } |
| 416 | fat_attach(inode, i_pos); |
| 417 | insert_inode_hash(inode); |
| 418 | out: |
| 419 | return inode; |
| 420 | } |
| 421 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 422 | EXPORT_SYMBOL_GPL(fat_build_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
| 424 | static void fat_delete_inode(struct inode *inode) |
| 425 | { |
Mark Fasheh | fef2665 | 2005-09-09 13:01:31 -0700 | [diff] [blame] | 426 | truncate_inode_pages(&inode->i_data, 0); |
| 427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | if (!is_bad_inode(inode)) { |
| 429 | inode->i_size = 0; |
| 430 | fat_truncate(inode); |
| 431 | } |
| 432 | clear_inode(inode); |
| 433 | } |
| 434 | |
| 435 | static void fat_clear_inode(struct inode *inode) |
| 436 | { |
| 437 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 438 | |
| 439 | if (is_bad_inode(inode)) |
| 440 | return; |
| 441 | lock_kernel(); |
| 442 | spin_lock(&sbi->inode_hash_lock); |
| 443 | fat_cache_inval_inode(inode); |
| 444 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); |
| 445 | spin_unlock(&sbi->inode_hash_lock); |
| 446 | unlock_kernel(); |
| 447 | } |
| 448 | |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 449 | static void fat_write_super(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 451 | sb->s_dirt = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
| 453 | if (!(sb->s_flags & MS_RDONLY)) |
| 454 | fat_clusters_flush(sb); |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | static void fat_put_super(struct super_block *sb) |
| 458 | { |
| 459 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
| 461 | if (sbi->nls_disk) { |
| 462 | unload_nls(sbi->nls_disk); |
| 463 | sbi->nls_disk = NULL; |
| 464 | sbi->options.codepage = fat_default_codepage; |
| 465 | } |
| 466 | if (sbi->nls_io) { |
| 467 | unload_nls(sbi->nls_io); |
| 468 | sbi->nls_io = NULL; |
| 469 | } |
| 470 | if (sbi->options.iocharset != fat_default_iocharset) { |
| 471 | kfree(sbi->options.iocharset); |
| 472 | sbi->options.iocharset = fat_default_iocharset; |
| 473 | } |
| 474 | |
| 475 | sb->s_fs_info = NULL; |
| 476 | kfree(sbi); |
| 477 | } |
| 478 | |
| 479 | static kmem_cache_t *fat_inode_cachep; |
| 480 | |
| 481 | static struct inode *fat_alloc_inode(struct super_block *sb) |
| 482 | { |
| 483 | struct msdos_inode_info *ei; |
| 484 | ei = kmem_cache_alloc(fat_inode_cachep, SLAB_KERNEL); |
| 485 | if (!ei) |
| 486 | return NULL; |
| 487 | return &ei->vfs_inode; |
| 488 | } |
| 489 | |
| 490 | static void fat_destroy_inode(struct inode *inode) |
| 491 | { |
| 492 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); |
| 493 | } |
| 494 | |
| 495 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
| 496 | { |
| 497 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; |
| 498 | |
| 499 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 500 | SLAB_CTOR_CONSTRUCTOR) { |
| 501 | spin_lock_init(&ei->cache_lru_lock); |
| 502 | ei->nr_caches = 0; |
| 503 | ei->cache_valid_id = FAT_CACHE_VALID + 1; |
| 504 | INIT_LIST_HEAD(&ei->cache_lru); |
| 505 | INIT_HLIST_NODE(&ei->i_fat_hash); |
| 506 | inode_init_once(&ei->vfs_inode); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | static int __init fat_init_inodecache(void) |
| 511 | { |
| 512 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", |
| 513 | sizeof(struct msdos_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 514 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 515 | SLAB_MEM_SPREAD), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | init_once, NULL); |
| 517 | if (fat_inode_cachep == NULL) |
| 518 | return -ENOMEM; |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static void __exit fat_destroy_inodecache(void) |
| 523 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 524 | kmem_cache_destroy(fat_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | static int fat_remount(struct super_block *sb, int *flags, char *data) |
| 528 | { |
| 529 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 530 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); |
| 531 | return 0; |
| 532 | } |
| 533 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 534 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 536 | struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | /* If the count of free cluster is still unknown, counts it here. */ |
| 539 | if (sbi->free_clusters == -1) { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 540 | int err = fat_count_free_clusters(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | if (err) |
| 542 | return err; |
| 543 | } |
| 544 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 545 | buf->f_type = dentry->d_sb->s_magic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | buf->f_bsize = sbi->cluster_size; |
| 547 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; |
| 548 | buf->f_bfree = sbi->free_clusters; |
| 549 | buf->f_bavail = sbi->free_clusters; |
| 550 | buf->f_namelen = sbi->options.isvfat ? 260 : 12; |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | static int fat_write_inode(struct inode *inode, int wait) |
| 556 | { |
| 557 | struct super_block *sb = inode->i_sb; |
| 558 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 559 | struct buffer_head *bh; |
| 560 | struct msdos_dir_entry *raw_entry; |
| 561 | loff_t i_pos; |
| 562 | int err = 0; |
| 563 | |
| 564 | retry: |
| 565 | i_pos = MSDOS_I(inode)->i_pos; |
| 566 | if (inode->i_ino == MSDOS_ROOT_INO || !i_pos) |
| 567 | return 0; |
| 568 | |
| 569 | lock_kernel(); |
| 570 | bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); |
| 571 | if (!bh) { |
| 572 | printk(KERN_ERR "FAT: unable to read inode block " |
| 573 | "for updating (i_pos %lld)\n", i_pos); |
| 574 | err = -EIO; |
| 575 | goto out; |
| 576 | } |
| 577 | spin_lock(&sbi->inode_hash_lock); |
| 578 | if (i_pos != MSDOS_I(inode)->i_pos) { |
| 579 | spin_unlock(&sbi->inode_hash_lock); |
| 580 | brelse(bh); |
| 581 | unlock_kernel(); |
| 582 | goto retry; |
| 583 | } |
| 584 | |
| 585 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) |
| 586 | [i_pos & (sbi->dir_per_block - 1)]; |
| 587 | if (S_ISDIR(inode->i_mode)) |
| 588 | raw_entry->size = 0; |
| 589 | else |
| 590 | raw_entry->size = cpu_to_le32(inode->i_size); |
| 591 | raw_entry->attr = fat_attr(inode); |
| 592 | raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart); |
| 593 | raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16); |
| 594 | fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time, &raw_entry->date); |
| 595 | if (sbi->options.isvfat) { |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 596 | __le16 atime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | fat_date_unix2dos(inode->i_ctime.tv_sec,&raw_entry->ctime,&raw_entry->cdate); |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 598 | fat_date_unix2dos(inode->i_atime.tv_sec,&atime,&raw_entry->adate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | raw_entry->ctime_cs = (inode->i_ctime.tv_sec & 1) * 100 + |
| 600 | inode->i_ctime.tv_nsec / 10000000; |
| 601 | } |
| 602 | spin_unlock(&sbi->inode_hash_lock); |
| 603 | mark_buffer_dirty(bh); |
| 604 | if (wait) |
| 605 | err = sync_dirty_buffer(bh); |
| 606 | brelse(bh); |
| 607 | out: |
| 608 | unlock_kernel(); |
| 609 | return err; |
| 610 | } |
| 611 | |
| 612 | int fat_sync_inode(struct inode *inode) |
| 613 | { |
| 614 | return fat_write_inode(inode, 1); |
| 615 | } |
| 616 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 617 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt); |
| 620 | static struct super_operations fat_sops = { |
| 621 | .alloc_inode = fat_alloc_inode, |
| 622 | .destroy_inode = fat_destroy_inode, |
| 623 | .write_inode = fat_write_inode, |
| 624 | .delete_inode = fat_delete_inode, |
| 625 | .put_super = fat_put_super, |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 626 | .write_super = fat_write_super, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | .statfs = fat_statfs, |
| 628 | .clear_inode = fat_clear_inode, |
| 629 | .remount_fs = fat_remount, |
| 630 | |
| 631 | .read_inode = make_bad_inode, |
| 632 | |
| 633 | .show_options = fat_show_options, |
| 634 | }; |
| 635 | |
| 636 | /* |
| 637 | * a FAT file handle with fhtype 3 is |
| 638 | * 0/ i_ino - for fast, reliable lookup if still in the cache |
| 639 | * 1/ i_generation - to see if i_ino is still valid |
| 640 | * bit 0 == 0 iff directory |
| 641 | * 2/ i_pos(8-39) - if ino has changed, but still in cache |
| 642 | * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos |
| 643 | * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc |
| 644 | * |
| 645 | * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum |
| 646 | * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits |
| 647 | * of i_logstart is used to store the directory entry offset. |
| 648 | */ |
| 649 | |
| 650 | static struct dentry * |
| 651 | fat_decode_fh(struct super_block *sb, __u32 *fh, int len, int fhtype, |
| 652 | int (*acceptable)(void *context, struct dentry *de), |
| 653 | void *context) |
| 654 | { |
| 655 | if (fhtype != 3) |
| 656 | return ERR_PTR(-ESTALE); |
| 657 | if (len < 5) |
| 658 | return ERR_PTR(-ESTALE); |
| 659 | |
| 660 | return sb->s_export_op->find_exported_dentry(sb, fh, NULL, acceptable, context); |
| 661 | } |
| 662 | |
| 663 | static struct dentry *fat_get_dentry(struct super_block *sb, void *inump) |
| 664 | { |
| 665 | struct inode *inode = NULL; |
| 666 | struct dentry *result; |
| 667 | __u32 *fh = inump; |
| 668 | |
| 669 | inode = iget(sb, fh[0]); |
| 670 | if (!inode || is_bad_inode(inode) || inode->i_generation != fh[1]) { |
| 671 | if (inode) |
| 672 | iput(inode); |
| 673 | inode = NULL; |
| 674 | } |
| 675 | if (!inode) { |
| 676 | loff_t i_pos; |
| 677 | int i_logstart = fh[3] & 0x0fffffff; |
| 678 | |
| 679 | i_pos = (loff_t)fh[2] << 8; |
| 680 | i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28); |
| 681 | |
| 682 | /* try 2 - see if i_pos is in F-d-c |
| 683 | * require i_logstart to be the same |
| 684 | * Will fail if you truncate and then re-write |
| 685 | */ |
| 686 | |
| 687 | inode = fat_iget(sb, i_pos); |
| 688 | if (inode && MSDOS_I(inode)->i_logstart != i_logstart) { |
| 689 | iput(inode); |
| 690 | inode = NULL; |
| 691 | } |
| 692 | } |
| 693 | if (!inode) { |
| 694 | /* For now, do nothing |
| 695 | * What we could do is: |
| 696 | * follow the file starting at fh[4], and record |
| 697 | * the ".." entry, and the name of the fh[2] entry. |
| 698 | * The follow the ".." file finding the next step up. |
| 699 | * This way we build a path to the root of |
| 700 | * the tree. If this works, we lookup the path and so |
| 701 | * get this inode into the cache. |
| 702 | * Finally try the fat_iget lookup again |
| 703 | * If that fails, then weare totally out of luck |
| 704 | * But all that is for another day |
| 705 | */ |
| 706 | } |
| 707 | if (!inode) |
| 708 | return ERR_PTR(-ESTALE); |
| 709 | |
| 710 | |
| 711 | /* now to find a dentry. |
| 712 | * If possible, get a well-connected one |
| 713 | */ |
| 714 | result = d_alloc_anon(inode); |
| 715 | if (result == NULL) { |
| 716 | iput(inode); |
| 717 | return ERR_PTR(-ENOMEM); |
| 718 | } |
| 719 | result->d_op = sb->s_root->d_op; |
| 720 | return result; |
| 721 | } |
| 722 | |
| 723 | static int |
| 724 | fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable) |
| 725 | { |
| 726 | int len = *lenp; |
| 727 | struct inode *inode = de->d_inode; |
| 728 | u32 ipos_h, ipos_m, ipos_l; |
| 729 | |
| 730 | if (len < 5) |
| 731 | return 255; /* no room */ |
| 732 | |
| 733 | ipos_h = MSDOS_I(inode)->i_pos >> 8; |
| 734 | ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24; |
| 735 | ipos_l = (MSDOS_I(inode)->i_pos & 0x0f) << 28; |
| 736 | *lenp = 5; |
| 737 | fh[0] = inode->i_ino; |
| 738 | fh[1] = inode->i_generation; |
| 739 | fh[2] = ipos_h; |
| 740 | fh[3] = ipos_m | MSDOS_I(inode)->i_logstart; |
| 741 | spin_lock(&de->d_lock); |
| 742 | fh[4] = ipos_l | MSDOS_I(de->d_parent->d_inode)->i_logstart; |
| 743 | spin_unlock(&de->d_lock); |
| 744 | return 3; |
| 745 | } |
| 746 | |
| 747 | static struct dentry *fat_get_parent(struct dentry *child) |
| 748 | { |
| 749 | struct buffer_head *bh; |
| 750 | struct msdos_dir_entry *de; |
| 751 | loff_t i_pos; |
| 752 | struct dentry *parent; |
| 753 | struct inode *inode; |
| 754 | int err; |
| 755 | |
| 756 | lock_kernel(); |
| 757 | |
| 758 | err = fat_get_dotdot_entry(child->d_inode, &bh, &de, &i_pos); |
| 759 | if (err) { |
| 760 | parent = ERR_PTR(err); |
| 761 | goto out; |
| 762 | } |
| 763 | inode = fat_build_inode(child->d_sb, de, i_pos); |
| 764 | brelse(bh); |
| 765 | if (IS_ERR(inode)) { |
| 766 | parent = ERR_PTR(PTR_ERR(inode)); |
| 767 | goto out; |
| 768 | } |
| 769 | parent = d_alloc_anon(inode); |
| 770 | if (!parent) { |
| 771 | iput(inode); |
| 772 | parent = ERR_PTR(-ENOMEM); |
| 773 | } |
| 774 | out: |
| 775 | unlock_kernel(); |
| 776 | |
| 777 | return parent; |
| 778 | } |
| 779 | |
| 780 | static struct export_operations fat_export_ops = { |
| 781 | .decode_fh = fat_decode_fh, |
| 782 | .encode_fh = fat_encode_fh, |
| 783 | .get_dentry = fat_get_dentry, |
| 784 | .get_parent = fat_get_parent, |
| 785 | }; |
| 786 | |
| 787 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt) |
| 788 | { |
| 789 | struct msdos_sb_info *sbi = MSDOS_SB(mnt->mnt_sb); |
| 790 | struct fat_mount_options *opts = &sbi->options; |
| 791 | int isvfat = opts->isvfat; |
| 792 | |
| 793 | if (opts->fs_uid != 0) |
| 794 | seq_printf(m, ",uid=%u", opts->fs_uid); |
| 795 | if (opts->fs_gid != 0) |
| 796 | seq_printf(m, ",gid=%u", opts->fs_gid); |
| 797 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); |
| 798 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); |
| 799 | if (sbi->nls_disk) |
| 800 | seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); |
| 801 | if (isvfat) { |
| 802 | if (sbi->nls_io) |
| 803 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); |
| 804 | |
| 805 | switch (opts->shortname) { |
| 806 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: |
| 807 | seq_puts(m, ",shortname=win95"); |
| 808 | break; |
| 809 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: |
| 810 | seq_puts(m, ",shortname=winnt"); |
| 811 | break; |
| 812 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: |
| 813 | seq_puts(m, ",shortname=mixed"); |
| 814 | break; |
| 815 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: |
| 816 | /* seq_puts(m, ",shortname=lower"); */ |
| 817 | break; |
| 818 | default: |
| 819 | seq_puts(m, ",shortname=unknown"); |
| 820 | break; |
| 821 | } |
| 822 | } |
| 823 | if (opts->name_check != 'n') |
| 824 | seq_printf(m, ",check=%c", opts->name_check); |
| 825 | if (opts->quiet) |
| 826 | seq_puts(m, ",quiet"); |
| 827 | if (opts->showexec) |
| 828 | seq_puts(m, ",showexec"); |
| 829 | if (opts->sys_immutable) |
| 830 | seq_puts(m, ",sys_immutable"); |
| 831 | if (!isvfat) { |
| 832 | if (opts->dotsOK) |
| 833 | seq_puts(m, ",dotsOK=yes"); |
| 834 | if (opts->nocase) |
| 835 | seq_puts(m, ",nocase"); |
| 836 | } else { |
| 837 | if (opts->utf8) |
| 838 | seq_puts(m, ",utf8"); |
| 839 | if (opts->unicode_xlate) |
| 840 | seq_puts(m, ",uni_xlate"); |
| 841 | if (!opts->numtail) |
| 842 | seq_puts(m, ",nonumtail"); |
| 843 | } |
| 844 | |
| 845 | return 0; |
| 846 | } |
| 847 | |
| 848 | enum { |
| 849 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, |
| 850 | Opt_umask, Opt_dmask, Opt_fmask, Opt_codepage, Opt_nocase, |
| 851 | Opt_quiet, Opt_showexec, Opt_debug, Opt_immutable, |
| 852 | Opt_dots, Opt_nodots, |
| 853 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
| 854 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, |
| 855 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, |
| 856 | Opt_obsolate, Opt_err, |
| 857 | }; |
| 858 | |
| 859 | static match_table_t fat_tokens = { |
| 860 | {Opt_check_r, "check=relaxed"}, |
| 861 | {Opt_check_s, "check=strict"}, |
| 862 | {Opt_check_n, "check=normal"}, |
| 863 | {Opt_check_r, "check=r"}, |
| 864 | {Opt_check_s, "check=s"}, |
| 865 | {Opt_check_n, "check=n"}, |
| 866 | {Opt_uid, "uid=%u"}, |
| 867 | {Opt_gid, "gid=%u"}, |
| 868 | {Opt_umask, "umask=%o"}, |
| 869 | {Opt_dmask, "dmask=%o"}, |
| 870 | {Opt_fmask, "fmask=%o"}, |
| 871 | {Opt_codepage, "codepage=%u"}, |
| 872 | {Opt_nocase, "nocase"}, |
| 873 | {Opt_quiet, "quiet"}, |
| 874 | {Opt_showexec, "showexec"}, |
| 875 | {Opt_debug, "debug"}, |
| 876 | {Opt_immutable, "sys_immutable"}, |
| 877 | {Opt_obsolate, "conv=binary"}, |
| 878 | {Opt_obsolate, "conv=text"}, |
| 879 | {Opt_obsolate, "conv=auto"}, |
| 880 | {Opt_obsolate, "conv=b"}, |
| 881 | {Opt_obsolate, "conv=t"}, |
| 882 | {Opt_obsolate, "conv=a"}, |
| 883 | {Opt_obsolate, "fat=%u"}, |
| 884 | {Opt_obsolate, "blocksize=%u"}, |
| 885 | {Opt_obsolate, "cvf_format=%20s"}, |
| 886 | {Opt_obsolate, "cvf_options=%100s"}, |
| 887 | {Opt_obsolate, "posix"}, |
| 888 | {Opt_err, NULL} |
| 889 | }; |
| 890 | static match_table_t msdos_tokens = { |
| 891 | {Opt_nodots, "nodots"}, |
| 892 | {Opt_nodots, "dotsOK=no"}, |
| 893 | {Opt_dots, "dots"}, |
| 894 | {Opt_dots, "dotsOK=yes"}, |
| 895 | {Opt_err, NULL} |
| 896 | }; |
| 897 | static match_table_t vfat_tokens = { |
| 898 | {Opt_charset, "iocharset=%s"}, |
| 899 | {Opt_shortname_lower, "shortname=lower"}, |
| 900 | {Opt_shortname_win95, "shortname=win95"}, |
| 901 | {Opt_shortname_winnt, "shortname=winnt"}, |
| 902 | {Opt_shortname_mixed, "shortname=mixed"}, |
| 903 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ |
| 904 | {Opt_utf8_no, "utf8=no"}, |
| 905 | {Opt_utf8_no, "utf8=false"}, |
| 906 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ |
| 907 | {Opt_utf8_yes, "utf8=yes"}, |
| 908 | {Opt_utf8_yes, "utf8=true"}, |
| 909 | {Opt_utf8_yes, "utf8"}, |
| 910 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ |
| 911 | {Opt_uni_xl_no, "uni_xlate=no"}, |
| 912 | {Opt_uni_xl_no, "uni_xlate=false"}, |
| 913 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ |
| 914 | {Opt_uni_xl_yes, "uni_xlate=yes"}, |
| 915 | {Opt_uni_xl_yes, "uni_xlate=true"}, |
| 916 | {Opt_uni_xl_yes, "uni_xlate"}, |
| 917 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ |
| 918 | {Opt_nonumtail_no, "nonumtail=no"}, |
| 919 | {Opt_nonumtail_no, "nonumtail=false"}, |
| 920 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ |
| 921 | {Opt_nonumtail_yes, "nonumtail=yes"}, |
| 922 | {Opt_nonumtail_yes, "nonumtail=true"}, |
| 923 | {Opt_nonumtail_yes, "nonumtail"}, |
| 924 | {Opt_err, NULL} |
| 925 | }; |
| 926 | |
Christoph Hellwig | 41a34a4 | 2005-11-08 21:34:57 -0800 | [diff] [blame] | 927 | static int parse_options(char *options, int is_vfat, int silent, int *debug, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | struct fat_mount_options *opts) |
| 929 | { |
| 930 | char *p; |
| 931 | substring_t args[MAX_OPT_ARGS]; |
| 932 | int option; |
| 933 | char *iocharset; |
| 934 | |
| 935 | opts->isvfat = is_vfat; |
| 936 | |
| 937 | opts->fs_uid = current->uid; |
| 938 | opts->fs_gid = current->gid; |
| 939 | opts->fs_fmask = opts->fs_dmask = current->fs->umask; |
| 940 | opts->codepage = fat_default_codepage; |
| 941 | opts->iocharset = fat_default_iocharset; |
| 942 | if (is_vfat) |
| 943 | opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95; |
| 944 | else |
| 945 | opts->shortname = 0; |
| 946 | opts->name_check = 'n'; |
| 947 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; |
| 948 | opts->utf8 = opts->unicode_xlate = 0; |
| 949 | opts->numtail = 1; |
| 950 | opts->nocase = 0; |
| 951 | *debug = 0; |
| 952 | |
| 953 | if (!options) |
| 954 | return 0; |
| 955 | |
| 956 | while ((p = strsep(&options, ",")) != NULL) { |
| 957 | int token; |
| 958 | if (!*p) |
| 959 | continue; |
| 960 | |
| 961 | token = match_token(p, fat_tokens, args); |
| 962 | if (token == Opt_err) { |
| 963 | if (is_vfat) |
| 964 | token = match_token(p, vfat_tokens, args); |
| 965 | else |
| 966 | token = match_token(p, msdos_tokens, args); |
| 967 | } |
| 968 | switch (token) { |
| 969 | case Opt_check_s: |
| 970 | opts->name_check = 's'; |
| 971 | break; |
| 972 | case Opt_check_r: |
| 973 | opts->name_check = 'r'; |
| 974 | break; |
| 975 | case Opt_check_n: |
| 976 | opts->name_check = 'n'; |
| 977 | break; |
| 978 | case Opt_nocase: |
| 979 | if (!is_vfat) |
| 980 | opts->nocase = 1; |
| 981 | else { |
| 982 | /* for backward compatibility */ |
| 983 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 |
| 984 | | VFAT_SFN_CREATE_WIN95; |
| 985 | } |
| 986 | break; |
| 987 | case Opt_quiet: |
| 988 | opts->quiet = 1; |
| 989 | break; |
| 990 | case Opt_showexec: |
| 991 | opts->showexec = 1; |
| 992 | break; |
| 993 | case Opt_debug: |
| 994 | *debug = 1; |
| 995 | break; |
| 996 | case Opt_immutable: |
| 997 | opts->sys_immutable = 1; |
| 998 | break; |
| 999 | case Opt_uid: |
| 1000 | if (match_int(&args[0], &option)) |
| 1001 | return 0; |
| 1002 | opts->fs_uid = option; |
| 1003 | break; |
| 1004 | case Opt_gid: |
| 1005 | if (match_int(&args[0], &option)) |
| 1006 | return 0; |
| 1007 | opts->fs_gid = option; |
| 1008 | break; |
| 1009 | case Opt_umask: |
| 1010 | if (match_octal(&args[0], &option)) |
| 1011 | return 0; |
| 1012 | opts->fs_fmask = opts->fs_dmask = option; |
| 1013 | break; |
| 1014 | case Opt_dmask: |
| 1015 | if (match_octal(&args[0], &option)) |
| 1016 | return 0; |
| 1017 | opts->fs_dmask = option; |
| 1018 | break; |
| 1019 | case Opt_fmask: |
| 1020 | if (match_octal(&args[0], &option)) |
| 1021 | return 0; |
| 1022 | opts->fs_fmask = option; |
| 1023 | break; |
| 1024 | case Opt_codepage: |
| 1025 | if (match_int(&args[0], &option)) |
| 1026 | return 0; |
| 1027 | opts->codepage = option; |
| 1028 | break; |
| 1029 | |
| 1030 | /* msdos specific */ |
| 1031 | case Opt_dots: |
| 1032 | opts->dotsOK = 1; |
| 1033 | break; |
| 1034 | case Opt_nodots: |
| 1035 | opts->dotsOK = 0; |
| 1036 | break; |
| 1037 | |
| 1038 | /* vfat specific */ |
| 1039 | case Opt_charset: |
| 1040 | if (opts->iocharset != fat_default_iocharset) |
| 1041 | kfree(opts->iocharset); |
| 1042 | iocharset = match_strdup(&args[0]); |
| 1043 | if (!iocharset) |
| 1044 | return -ENOMEM; |
| 1045 | opts->iocharset = iocharset; |
| 1046 | break; |
| 1047 | case Opt_shortname_lower: |
| 1048 | opts->shortname = VFAT_SFN_DISPLAY_LOWER |
| 1049 | | VFAT_SFN_CREATE_WIN95; |
| 1050 | break; |
| 1051 | case Opt_shortname_win95: |
| 1052 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 |
| 1053 | | VFAT_SFN_CREATE_WIN95; |
| 1054 | break; |
| 1055 | case Opt_shortname_winnt: |
| 1056 | opts->shortname = VFAT_SFN_DISPLAY_WINNT |
| 1057 | | VFAT_SFN_CREATE_WINNT; |
| 1058 | break; |
| 1059 | case Opt_shortname_mixed: |
| 1060 | opts->shortname = VFAT_SFN_DISPLAY_WINNT |
| 1061 | | VFAT_SFN_CREATE_WIN95; |
| 1062 | break; |
| 1063 | case Opt_utf8_no: /* 0 or no or false */ |
| 1064 | opts->utf8 = 0; |
| 1065 | break; |
| 1066 | case Opt_utf8_yes: /* empty or 1 or yes or true */ |
| 1067 | opts->utf8 = 1; |
| 1068 | break; |
| 1069 | case Opt_uni_xl_no: /* 0 or no or false */ |
| 1070 | opts->unicode_xlate = 0; |
| 1071 | break; |
| 1072 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ |
| 1073 | opts->unicode_xlate = 1; |
| 1074 | break; |
| 1075 | case Opt_nonumtail_no: /* 0 or no or false */ |
| 1076 | opts->numtail = 1; /* negated option */ |
| 1077 | break; |
| 1078 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ |
| 1079 | opts->numtail = 0; /* negated option */ |
| 1080 | break; |
| 1081 | |
| 1082 | /* obsolete mount options */ |
| 1083 | case Opt_obsolate: |
| 1084 | printk(KERN_INFO "FAT: \"%s\" option is obsolete, " |
| 1085 | "not supported now\n", p); |
| 1086 | break; |
| 1087 | /* unknown option */ |
| 1088 | default: |
Christoph Hellwig | 41a34a4 | 2005-11-08 21:34:57 -0800 | [diff] [blame] | 1089 | if (!silent) { |
| 1090 | printk(KERN_ERR |
| 1091 | "FAT: Unrecognized mount option \"%s\" " |
| 1092 | "or missing value\n", p); |
| 1093 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | return -EINVAL; |
| 1095 | } |
| 1096 | } |
Alexey Dobriyan | 4de151d | 2006-03-22 00:13:35 +0100 | [diff] [blame] | 1097 | /* UTF-8 doesn't provide FAT semantics */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | if (!strcmp(opts->iocharset, "utf8")) { |
| 1099 | printk(KERN_ERR "FAT: utf8 is not a recommended IO charset" |
| 1100 | " for FAT filesystems, filesystem will be case sensitive!\n"); |
| 1101 | } |
| 1102 | |
| 1103 | if (opts->unicode_xlate) |
| 1104 | opts->utf8 = 0; |
| 1105 | |
| 1106 | return 0; |
| 1107 | } |
| 1108 | |
| 1109 | static int fat_read_root(struct inode *inode) |
| 1110 | { |
| 1111 | struct super_block *sb = inode->i_sb; |
| 1112 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 1113 | int error; |
| 1114 | |
| 1115 | MSDOS_I(inode)->i_pos = 0; |
| 1116 | inode->i_uid = sbi->options.fs_uid; |
| 1117 | inode->i_gid = sbi->options.fs_gid; |
| 1118 | inode->i_version++; |
| 1119 | inode->i_generation = 0; |
| 1120 | inode->i_mode = (S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR; |
| 1121 | inode->i_op = sbi->dir_ops; |
| 1122 | inode->i_fop = &fat_dir_operations; |
| 1123 | if (sbi->fat_bits == 32) { |
| 1124 | MSDOS_I(inode)->i_start = sbi->root_cluster; |
| 1125 | error = fat_calc_dir_size(inode); |
| 1126 | if (error < 0) |
| 1127 | return error; |
| 1128 | } else { |
| 1129 | MSDOS_I(inode)->i_start = 0; |
| 1130 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); |
| 1131 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
| 1133 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; |
| 1134 | MSDOS_I(inode)->i_logstart = 0; |
| 1135 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 1136 | |
| 1137 | MSDOS_I(inode)->i_attrs = ATTR_NONE; |
| 1138 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; |
| 1139 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; |
| 1140 | inode->i_nlink = fat_subdirs(inode)+2; |
| 1141 | |
| 1142 | return 0; |
| 1143 | } |
| 1144 | |
| 1145 | /* |
| 1146 | * Read the super block of an MS-DOS FS. |
| 1147 | */ |
| 1148 | int fat_fill_super(struct super_block *sb, void *data, int silent, |
| 1149 | struct inode_operations *fs_dir_inode_ops, int isvfat) |
| 1150 | { |
| 1151 | struct inode *root_inode = NULL; |
| 1152 | struct buffer_head *bh; |
| 1153 | struct fat_boot_sector *b; |
| 1154 | struct msdos_sb_info *sbi; |
| 1155 | u16 logical_sector_size; |
| 1156 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; |
| 1157 | int debug; |
| 1158 | unsigned int media; |
| 1159 | long error; |
| 1160 | char buf[50]; |
| 1161 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 1162 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | if (!sbi) |
| 1164 | return -ENOMEM; |
| 1165 | sb->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | sb->s_flags |= MS_NODIRATIME; |
| 1168 | sb->s_magic = MSDOS_SUPER_MAGIC; |
| 1169 | sb->s_op = &fat_sops; |
| 1170 | sb->s_export_op = &fat_export_ops; |
| 1171 | sbi->dir_ops = fs_dir_inode_ops; |
| 1172 | |
Christoph Hellwig | 41a34a4 | 2005-11-08 21:34:57 -0800 | [diff] [blame] | 1173 | error = parse_options(data, isvfat, silent, &debug, &sbi->options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | if (error) |
| 1175 | goto out_fail; |
| 1176 | |
| 1177 | error = -EIO; |
| 1178 | sb_min_blocksize(sb, 512); |
| 1179 | bh = sb_bread(sb, 0); |
| 1180 | if (bh == NULL) { |
| 1181 | printk(KERN_ERR "FAT: unable to read boot sector\n"); |
| 1182 | goto out_fail; |
| 1183 | } |
| 1184 | |
| 1185 | b = (struct fat_boot_sector *) bh->b_data; |
| 1186 | if (!b->reserved) { |
| 1187 | if (!silent) |
| 1188 | printk(KERN_ERR "FAT: bogus number of reserved sectors\n"); |
| 1189 | brelse(bh); |
| 1190 | goto out_invalid; |
| 1191 | } |
| 1192 | if (!b->fats) { |
| 1193 | if (!silent) |
| 1194 | printk(KERN_ERR "FAT: bogus number of FAT structure\n"); |
| 1195 | brelse(bh); |
| 1196 | goto out_invalid; |
| 1197 | } |
| 1198 | |
| 1199 | /* |
| 1200 | * Earlier we checked here that b->secs_track and b->head are nonzero, |
| 1201 | * but it turns out valid FAT filesystems can have zero there. |
| 1202 | */ |
| 1203 | |
| 1204 | media = b->media; |
| 1205 | if (!FAT_VALID_MEDIA(media)) { |
| 1206 | if (!silent) |
| 1207 | printk(KERN_ERR "FAT: invalid media value (0x%02x)\n", |
| 1208 | media); |
| 1209 | brelse(bh); |
| 1210 | goto out_invalid; |
| 1211 | } |
| 1212 | logical_sector_size = |
| 1213 | le16_to_cpu(get_unaligned((__le16 *)&b->sector_size)); |
| 1214 | if (!logical_sector_size |
| 1215 | || (logical_sector_size & (logical_sector_size - 1)) |
| 1216 | || (logical_sector_size < 512) |
| 1217 | || (PAGE_CACHE_SIZE < logical_sector_size)) { |
| 1218 | if (!silent) |
| 1219 | printk(KERN_ERR "FAT: bogus logical sector size %u\n", |
| 1220 | logical_sector_size); |
| 1221 | brelse(bh); |
| 1222 | goto out_invalid; |
| 1223 | } |
| 1224 | sbi->sec_per_clus = b->sec_per_clus; |
| 1225 | if (!sbi->sec_per_clus |
| 1226 | || (sbi->sec_per_clus & (sbi->sec_per_clus - 1))) { |
| 1227 | if (!silent) |
| 1228 | printk(KERN_ERR "FAT: bogus sectors per cluster %u\n", |
| 1229 | sbi->sec_per_clus); |
| 1230 | brelse(bh); |
| 1231 | goto out_invalid; |
| 1232 | } |
| 1233 | |
| 1234 | if (logical_sector_size < sb->s_blocksize) { |
| 1235 | printk(KERN_ERR "FAT: logical sector size too small for device" |
| 1236 | " (logical sector size = %u)\n", logical_sector_size); |
| 1237 | brelse(bh); |
| 1238 | goto out_fail; |
| 1239 | } |
| 1240 | if (logical_sector_size > sb->s_blocksize) { |
| 1241 | brelse(bh); |
| 1242 | |
| 1243 | if (!sb_set_blocksize(sb, logical_sector_size)) { |
| 1244 | printk(KERN_ERR "FAT: unable to set blocksize %u\n", |
| 1245 | logical_sector_size); |
| 1246 | goto out_fail; |
| 1247 | } |
| 1248 | bh = sb_bread(sb, 0); |
| 1249 | if (bh == NULL) { |
| 1250 | printk(KERN_ERR "FAT: unable to read boot sector" |
| 1251 | " (logical sector size = %lu)\n", |
| 1252 | sb->s_blocksize); |
| 1253 | goto out_fail; |
| 1254 | } |
| 1255 | b = (struct fat_boot_sector *) bh->b_data; |
| 1256 | } |
| 1257 | |
| 1258 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; |
| 1259 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; |
| 1260 | sbi->fats = b->fats; |
| 1261 | sbi->fat_bits = 0; /* Don't know yet */ |
| 1262 | sbi->fat_start = le16_to_cpu(b->reserved); |
| 1263 | sbi->fat_length = le16_to_cpu(b->fat_length); |
| 1264 | sbi->root_cluster = 0; |
| 1265 | sbi->free_clusters = -1; /* Don't know yet */ |
| 1266 | sbi->prev_free = FAT_START_ENT; |
| 1267 | |
| 1268 | if (!sbi->fat_length && b->fat32_length) { |
| 1269 | struct fat_boot_fsinfo *fsinfo; |
| 1270 | struct buffer_head *fsinfo_bh; |
| 1271 | |
| 1272 | /* Must be FAT32 */ |
| 1273 | sbi->fat_bits = 32; |
| 1274 | sbi->fat_length = le32_to_cpu(b->fat32_length); |
| 1275 | sbi->root_cluster = le32_to_cpu(b->root_cluster); |
| 1276 | |
| 1277 | sb->s_maxbytes = 0xffffffff; |
| 1278 | |
| 1279 | /* MC - if info_sector is 0, don't multiply by 0 */ |
| 1280 | sbi->fsinfo_sector = le16_to_cpu(b->info_sector); |
| 1281 | if (sbi->fsinfo_sector == 0) |
| 1282 | sbi->fsinfo_sector = 1; |
| 1283 | |
| 1284 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); |
| 1285 | if (fsinfo_bh == NULL) { |
| 1286 | printk(KERN_ERR "FAT: bread failed, FSINFO block" |
| 1287 | " (sector = %lu)\n", sbi->fsinfo_sector); |
| 1288 | brelse(bh); |
| 1289 | goto out_fail; |
| 1290 | } |
| 1291 | |
| 1292 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; |
| 1293 | if (!IS_FSINFO(fsinfo)) { |
| 1294 | printk(KERN_WARNING |
| 1295 | "FAT: Did not find valid FSINFO signature.\n" |
| 1296 | " Found signature1 0x%08x signature2 0x%08x" |
| 1297 | " (sector = %lu)\n", |
| 1298 | le32_to_cpu(fsinfo->signature1), |
| 1299 | le32_to_cpu(fsinfo->signature2), |
| 1300 | sbi->fsinfo_sector); |
| 1301 | } else { |
| 1302 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); |
| 1303 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
| 1304 | } |
| 1305 | |
| 1306 | brelse(fsinfo_bh); |
| 1307 | } |
| 1308 | |
| 1309 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); |
| 1310 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; |
| 1311 | |
| 1312 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; |
| 1313 | sbi->dir_entries = |
| 1314 | le16_to_cpu(get_unaligned((__le16 *)&b->dir_entries)); |
| 1315 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
| 1316 | if (!silent) |
| 1317 | printk(KERN_ERR "FAT: bogus directroy-entries per block" |
| 1318 | " (%u)\n", sbi->dir_entries); |
| 1319 | brelse(bh); |
| 1320 | goto out_invalid; |
| 1321 | } |
| 1322 | |
| 1323 | rootdir_sectors = sbi->dir_entries |
| 1324 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; |
| 1325 | sbi->data_start = sbi->dir_start + rootdir_sectors; |
| 1326 | total_sectors = le16_to_cpu(get_unaligned((__le16 *)&b->sectors)); |
| 1327 | if (total_sectors == 0) |
| 1328 | total_sectors = le32_to_cpu(b->total_sect); |
| 1329 | |
| 1330 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; |
| 1331 | |
| 1332 | if (sbi->fat_bits != 32) |
| 1333 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; |
| 1334 | |
| 1335 | /* check that FAT table does not overflow */ |
| 1336 | fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; |
| 1337 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); |
| 1338 | if (total_clusters > MAX_FAT(sb)) { |
| 1339 | if (!silent) |
| 1340 | printk(KERN_ERR "FAT: count of clusters too big (%u)\n", |
| 1341 | total_clusters); |
| 1342 | brelse(bh); |
| 1343 | goto out_invalid; |
| 1344 | } |
| 1345 | |
| 1346 | sbi->max_cluster = total_clusters + FAT_START_ENT; |
| 1347 | /* check the free_clusters, it's not necessarily correct */ |
| 1348 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) |
| 1349 | sbi->free_clusters = -1; |
| 1350 | /* check the prev_free, it's not necessarily correct */ |
| 1351 | sbi->prev_free %= sbi->max_cluster; |
| 1352 | if (sbi->prev_free < FAT_START_ENT) |
| 1353 | sbi->prev_free = FAT_START_ENT; |
| 1354 | |
| 1355 | brelse(bh); |
| 1356 | |
| 1357 | /* set up enough so that it can read an inode */ |
| 1358 | fat_hash_init(sb); |
| 1359 | fat_ent_access_init(sb); |
| 1360 | |
| 1361 | /* |
| 1362 | * The low byte of FAT's first entry must have same value with |
| 1363 | * media-field. But in real world, too many devices is |
| 1364 | * writing wrong value. So, removed that validity check. |
| 1365 | * |
| 1366 | * if (FAT_FIRST_ENT(sb, media) != first) |
| 1367 | */ |
| 1368 | |
| 1369 | error = -EINVAL; |
| 1370 | sprintf(buf, "cp%d", sbi->options.codepage); |
| 1371 | sbi->nls_disk = load_nls(buf); |
| 1372 | if (!sbi->nls_disk) { |
| 1373 | printk(KERN_ERR "FAT: codepage %s not found\n", buf); |
| 1374 | goto out_fail; |
| 1375 | } |
| 1376 | |
| 1377 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ |
| 1378 | if (sbi->options.isvfat) { |
| 1379 | sbi->nls_io = load_nls(sbi->options.iocharset); |
| 1380 | if (!sbi->nls_io) { |
| 1381 | printk(KERN_ERR "FAT: IO charset %s not found\n", |
| 1382 | sbi->options.iocharset); |
| 1383 | goto out_fail; |
| 1384 | } |
| 1385 | } |
| 1386 | |
| 1387 | error = -ENOMEM; |
| 1388 | root_inode = new_inode(sb); |
| 1389 | if (!root_inode) |
| 1390 | goto out_fail; |
| 1391 | root_inode->i_ino = MSDOS_ROOT_INO; |
| 1392 | root_inode->i_version = 1; |
| 1393 | error = fat_read_root(root_inode); |
| 1394 | if (error < 0) |
| 1395 | goto out_fail; |
| 1396 | error = -ENOMEM; |
| 1397 | insert_inode_hash(root_inode); |
| 1398 | sb->s_root = d_alloc_root(root_inode); |
| 1399 | if (!sb->s_root) { |
| 1400 | printk(KERN_ERR "FAT: get root inode failed\n"); |
| 1401 | goto out_fail; |
| 1402 | } |
| 1403 | |
| 1404 | return 0; |
| 1405 | |
| 1406 | out_invalid: |
| 1407 | error = -EINVAL; |
| 1408 | if (!silent) |
| 1409 | printk(KERN_INFO "VFS: Can't find a valid FAT filesystem" |
| 1410 | " on dev %s.\n", sb->s_id); |
| 1411 | |
| 1412 | out_fail: |
| 1413 | if (root_inode) |
| 1414 | iput(root_inode); |
| 1415 | if (sbi->nls_io) |
| 1416 | unload_nls(sbi->nls_io); |
| 1417 | if (sbi->nls_disk) |
| 1418 | unload_nls(sbi->nls_disk); |
| 1419 | if (sbi->options.iocharset != fat_default_iocharset) |
| 1420 | kfree(sbi->options.iocharset); |
| 1421 | sb->s_fs_info = NULL; |
| 1422 | kfree(sbi); |
| 1423 | return error; |
| 1424 | } |
| 1425 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 1426 | EXPORT_SYMBOL_GPL(fat_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | static int __init init_fat_fs(void) |
| 1429 | { |
Pekka J Enberg | 532a39a | 2005-06-30 02:59:01 -0700 | [diff] [blame] | 1430 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | |
Pekka J Enberg | 532a39a | 2005-06-30 02:59:01 -0700 | [diff] [blame] | 1432 | err = fat_cache_init(); |
| 1433 | if (err) |
| 1434 | return err; |
| 1435 | |
| 1436 | err = fat_init_inodecache(); |
| 1437 | if (err) |
| 1438 | goto failed; |
| 1439 | |
| 1440 | return 0; |
| 1441 | |
| 1442 | failed: |
| 1443 | fat_cache_destroy(); |
| 1444 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | } |
| 1446 | |
| 1447 | static void __exit exit_fat_fs(void) |
| 1448 | { |
| 1449 | fat_cache_destroy(); |
| 1450 | fat_destroy_inodecache(); |
| 1451 | } |
| 1452 | |
| 1453 | module_init(init_fat_fs) |
| 1454 | module_exit(exit_fat_fs) |
| 1455 | |
| 1456 | MODULE_LICENSE("GPL"); |