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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/pagemap.h> |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 19 | #include <linux/mpage.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/buffer_head.h> |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 21 | #include <linux/exportfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/mount.h> |
| 23 | #include <linux/vfs.h> |
| 24 | #include <linux/parser.h> |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 25 | #include <linux/uio.h> |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 26 | #include <linux/writeback.h> |
Vignesh Babu BM | e7d709c | 2007-05-08 00:24:27 -0700 | [diff] [blame] | 27 | #include <linux/log2.h> |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 28 | #include <linux/hash.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/unaligned.h> |
OGAWA Hirofumi | 9e975da | 2008-11-06 12:53:46 -0800 | [diff] [blame] | 30 | #include "fat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #ifndef CONFIG_FAT_DEFAULT_IOCHARSET |
| 33 | /* if user don't select VFAT, this is undefined. */ |
| 34 | #define CONFIG_FAT_DEFAULT_IOCHARSET "" |
| 35 | #endif |
| 36 | |
| 37 | static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; |
| 38 | static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; |
| 39 | |
| 40 | |
| 41 | static int fat_add_cluster(struct inode *inode) |
| 42 | { |
| 43 | int err, cluster; |
| 44 | |
| 45 | err = fat_alloc_clusters(inode, &cluster, 1); |
| 46 | if (err) |
| 47 | return err; |
| 48 | /* FIXME: this cluster should be added after data of this |
| 49 | * cluster is writed */ |
| 50 | err = fat_chain_add(inode, cluster, 1); |
| 51 | if (err) |
| 52 | fat_free_clusters(inode, cluster); |
| 53 | return err; |
| 54 | } |
| 55 | |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 56 | static inline int __fat_get_block(struct inode *inode, sector_t iblock, |
| 57 | unsigned long *max_blocks, |
| 58 | struct buffer_head *bh_result, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
| 60 | struct super_block *sb = inode->i_sb; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 61 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 62 | unsigned long mapped_blocks; |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 63 | sector_t phys; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 64 | int err, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
OGAWA Hirofumi | 2bdf67e | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 66 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | if (err) |
| 68 | return err; |
| 69 | if (phys) { |
| 70 | map_bh(bh_result, sb, phys); |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 71 | *max_blocks = min(mapped_blocks, *max_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | return 0; |
| 73 | } |
| 74 | if (!create) |
| 75 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 78 | fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)", |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 79 | MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | return -EIO; |
| 81 | } |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 82 | |
| 83 | offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); |
| 84 | if (!offset) { |
| 85 | /* TODO: multiple cluster allocation would be desirable. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | err = fat_add_cluster(inode); |
| 87 | if (err) |
| 88 | return err; |
| 89 | } |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 90 | /* available blocks on this cluster */ |
| 91 | mapped_blocks = sbi->sec_per_clus - offset; |
| 92 | |
| 93 | *max_blocks = min(mapped_blocks, *max_blocks); |
| 94 | MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; |
| 95 | |
OGAWA Hirofumi | 2bdf67e | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 96 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | if (err) |
| 98 | return err; |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 99 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 100 | BUG_ON(!phys); |
| 101 | BUG_ON(*max_blocks != mapped_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | set_buffer_new(bh_result); |
| 103 | map_bh(bh_result, sb, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static int fat_get_block(struct inode *inode, sector_t iblock, |
| 109 | struct buffer_head *bh_result, int create) |
| 110 | { |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 111 | struct super_block *sb = inode->i_sb; |
| 112 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
| 113 | int err; |
| 114 | |
| 115 | err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); |
| 116 | if (err) |
| 117 | return err; |
| 118 | bh_result->b_size = max_blocks << sb->s_blocksize_bits; |
| 119 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 120 | } |
| 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | static int fat_writepage(struct page *page, struct writeback_control *wbc) |
| 123 | { |
| 124 | return block_write_full_page(page, fat_get_block, wbc); |
| 125 | } |
| 126 | |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 127 | static int fat_writepages(struct address_space *mapping, |
| 128 | struct writeback_control *wbc) |
| 129 | { |
| 130 | return mpage_writepages(mapping, wbc, fat_get_block); |
| 131 | } |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | static int fat_readpage(struct file *file, struct page *page) |
| 134 | { |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 135 | return mpage_readpage(page, fat_get_block); |
| 136 | } |
| 137 | |
| 138 | static int fat_readpages(struct file *file, struct address_space *mapping, |
| 139 | struct list_head *pages, unsigned nr_pages) |
| 140 | { |
| 141 | return mpage_readpages(mapping, pages, nr_pages, fat_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
| 143 | |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 144 | static void fat_write_failed(struct address_space *mapping, loff_t to) |
| 145 | { |
| 146 | struct inode *inode = mapping->host; |
| 147 | |
| 148 | if (to > inode->i_size) { |
| 149 | truncate_pagecache(inode, to, inode->i_size); |
| 150 | fat_truncate_blocks(inode, inode->i_size); |
| 151 | } |
| 152 | } |
| 153 | |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 154 | static int fat_write_begin(struct file *file, struct address_space *mapping, |
| 155 | loff_t pos, unsigned len, unsigned flags, |
| 156 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | { |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 158 | int err; |
| 159 | |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 160 | *pagep = NULL; |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 161 | err = cont_write_begin(file, mapping, pos, len, flags, |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 162 | pagep, fsdata, fat_get_block, |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 163 | &MSDOS_I(mapping->host)->mmu_private); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 164 | if (err < 0) |
| 165 | fat_write_failed(mapping, pos + len); |
| 166 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 169 | static int fat_write_end(struct file *file, struct address_space *mapping, |
| 170 | loff_t pos, unsigned len, unsigned copied, |
| 171 | struct page *pagep, void *fsdata) |
OGAWA Hirofumi | ef40226 | 2005-09-16 19:28:13 -0700 | [diff] [blame] | 172 | { |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 173 | struct inode *inode = mapping->host; |
| 174 | int err; |
| 175 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 176 | if (err < len) |
| 177 | fat_write_failed(mapping, pos + len); |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 178 | if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { |
OGAWA Hirofumi | ef40226 | 2005-09-16 19:28:13 -0700 | [diff] [blame] | 179 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
| 180 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; |
| 181 | mark_inode_dirty(inode); |
| 182 | } |
| 183 | return err; |
| 184 | } |
| 185 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 186 | static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, |
| 187 | const struct iovec *iov, |
| 188 | loff_t offset, unsigned long nr_segs) |
| 189 | { |
| 190 | struct file *file = iocb->ki_filp; |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 191 | struct address_space *mapping = file->f_mapping; |
| 192 | struct inode *inode = mapping->host; |
| 193 | ssize_t ret; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 194 | |
| 195 | if (rw == WRITE) { |
| 196 | /* |
Nick Piggin | 4e02ed4 | 2008-10-29 14:00:55 -0700 | [diff] [blame] | 197 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 198 | * so we need to update the ->mmu_private to block boundary. |
| 199 | * |
| 200 | * But we must fill the remaining area or hole by nul for |
| 201 | * updating ->mmu_private. |
OGAWA Hirofumi | 94412a9 | 2007-02-20 13:57:55 -0800 | [diff] [blame] | 202 | * |
| 203 | * Return 0, and fallback to normal buffered write. |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 204 | */ |
| 205 | loff_t size = offset + iov_length(iov, nr_segs); |
| 206 | if (MSDOS_I(inode)->mmu_private < size) |
OGAWA Hirofumi | 94412a9 | 2007-02-20 13:57:55 -0800 | [diff] [blame] | 207 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | /* |
| 211 | * FAT need to use the DIO_LOCKING for avoiding the race |
| 212 | * condition of fat_get_block() and ->truncate(). |
| 213 | */ |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 214 | ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, |
| 215 | iov, offset, nr_segs, fat_get_block, NULL); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 216 | if (ret < 0 && (rw & WRITE)) |
| 217 | fat_write_failed(mapping, offset + iov_length(iov, nr_segs)); |
| 218 | |
| 219 | return ret; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 220 | } |
| 221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
| 223 | { |
OGAWA Hirofumi | fa93ca1 | 2008-11-06 12:53:56 -0800 | [diff] [blame] | 224 | sector_t blocknr; |
| 225 | |
| 226 | /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ |
OGAWA Hirofumi | 3a95ea1 | 2009-03-12 02:03:23 +0900 | [diff] [blame] | 227 | down_read(&mapping->host->i_alloc_sem); |
OGAWA Hirofumi | fa93ca1 | 2008-11-06 12:53:56 -0800 | [diff] [blame] | 228 | blocknr = generic_block_bmap(mapping, block, fat_get_block); |
OGAWA Hirofumi | 3a95ea1 | 2009-03-12 02:03:23 +0900 | [diff] [blame] | 229 | up_read(&mapping->host->i_alloc_sem); |
OGAWA Hirofumi | fa93ca1 | 2008-11-06 12:53:56 -0800 | [diff] [blame] | 230 | |
| 231 | return blocknr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 234 | static const struct address_space_operations fat_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | .readpage = fat_readpage, |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 236 | .readpages = fat_readpages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | .writepage = fat_writepage, |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 238 | .writepages = fat_writepages, |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 239 | .write_begin = fat_write_begin, |
| 240 | .write_end = fat_write_end, |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 241 | .direct_IO = fat_direct_IO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | .bmap = _fat_bmap |
| 243 | }; |
| 244 | |
| 245 | /* |
| 246 | * New FAT inode stuff. We do the following: |
| 247 | * a) i_ino is constant and has nothing with on-disk location. |
| 248 | * b) FAT manages its own cache of directory entries. |
| 249 | * c) *This* cache is indexed by on-disk location. |
| 250 | * d) inode has an associated directory entry, all right, but |
| 251 | * it may be unhashed. |
| 252 | * e) currently entries are stored within struct inode. That should |
| 253 | * change. |
| 254 | * f) we deal with races in the following way: |
| 255 | * 1. readdir() and lookup() do FAT-dir-cache lookup. |
| 256 | * 2. rename() unhashes the F-d-c entry and rehashes it in |
| 257 | * a new place. |
| 258 | * 3. unlink() and rmdir() unhash F-d-c entry. |
| 259 | * 4. fat_write_inode() checks whether the thing is unhashed. |
| 260 | * If it is we silently return. If it isn't we do bread(), |
| 261 | * check if the location is still valid and retry if it |
| 262 | * isn't. Otherwise we do changes. |
| 263 | * 5. Spinlock is used to protect hash/unhash/location check/lookup |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 264 | * 6. fat_evict_inode() unhashes the F-d-c entry. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry |
| 266 | * and consider negative result as cache miss. |
| 267 | */ |
| 268 | |
| 269 | static void fat_hash_init(struct super_block *sb) |
| 270 | { |
| 271 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 272 | int i; |
| 273 | |
| 274 | spin_lock_init(&sbi->inode_hash_lock); |
| 275 | for (i = 0; i < FAT_HASH_SIZE; i++) |
| 276 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); |
| 277 | } |
| 278 | |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 279 | static inline unsigned long fat_hash(loff_t i_pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | { |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 281 | return hash_32(i_pos, FAT_HASH_BITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | void fat_attach(struct inode *inode, loff_t i_pos) |
| 285 | { |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 286 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 287 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | spin_lock(&sbi->inode_hash_lock); |
| 290 | MSDOS_I(inode)->i_pos = i_pos; |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 291 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | spin_unlock(&sbi->inode_hash_lock); |
| 293 | } |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 294 | EXPORT_SYMBOL_GPL(fat_attach); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
| 296 | void fat_detach(struct inode *inode) |
| 297 | { |
| 298 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 299 | spin_lock(&sbi->inode_hash_lock); |
| 300 | MSDOS_I(inode)->i_pos = 0; |
| 301 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); |
| 302 | spin_unlock(&sbi->inode_hash_lock); |
| 303 | } |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 304 | EXPORT_SYMBOL_GPL(fat_detach); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) |
| 307 | { |
| 308 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 309 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | struct hlist_node *_p; |
| 311 | struct msdos_inode_info *i; |
| 312 | struct inode *inode = NULL; |
| 313 | |
| 314 | spin_lock(&sbi->inode_hash_lock); |
| 315 | hlist_for_each_entry(i, _p, head, i_fat_hash) { |
| 316 | BUG_ON(i->vfs_inode.i_sb != sb); |
| 317 | if (i->i_pos != i_pos) |
| 318 | continue; |
| 319 | inode = igrab(&i->vfs_inode); |
| 320 | if (inode) |
| 321 | break; |
| 322 | } |
| 323 | spin_unlock(&sbi->inode_hash_lock); |
| 324 | return inode; |
| 325 | } |
| 326 | |
| 327 | static int is_exec(unsigned char *extension) |
| 328 | { |
| 329 | unsigned char *exe_extensions = "EXECOMBAT", *walk; |
| 330 | |
| 331 | for (walk = exe_extensions; *walk; walk += 3) |
| 332 | if (!strncmp(extension, walk, 3)) |
| 333 | return 1; |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | static int fat_calc_dir_size(struct inode *inode) |
| 338 | { |
| 339 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 340 | int ret, fclus, dclus; |
| 341 | |
| 342 | inode->i_size = 0; |
| 343 | if (MSDOS_I(inode)->i_start == 0) |
| 344 | return 0; |
| 345 | |
| 346 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); |
| 347 | if (ret < 0) |
| 348 | return ret; |
| 349 | inode->i_size = (fclus + 1) << sbi->cluster_bits; |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | /* doesn't deal with root inode */ |
| 355 | static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) |
| 356 | { |
| 357 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 358 | int error; |
| 359 | |
| 360 | MSDOS_I(inode)->i_pos = 0; |
| 361 | inode->i_uid = sbi->options.fs_uid; |
| 362 | inode->i_gid = sbi->options.fs_gid; |
| 363 | inode->i_version++; |
| 364 | inode->i_generation = get_seconds(); |
| 365 | |
| 366 | if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { |
| 367 | inode->i_generation &= ~1; |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 368 | inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | inode->i_op = sbi->dir_ops; |
| 370 | inode->i_fop = &fat_dir_operations; |
| 371 | |
| 372 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); |
| 373 | if (sbi->fat_bits == 32) |
| 374 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); |
| 375 | |
| 376 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
| 377 | error = fat_calc_dir_size(inode); |
| 378 | if (error < 0) |
| 379 | return error; |
| 380 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 381 | |
| 382 | inode->i_nlink = fat_subdirs(inode); |
| 383 | } else { /* not a directory */ |
| 384 | inode->i_generation |= 1; |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 385 | inode->i_mode = fat_make_mode(sbi, de->attr, |
| 386 | ((sbi->options.showexec && !is_exec(de->name + 8)) |
| 387 | ? S_IRUGO|S_IWUGO : S_IRWXUGO)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | MSDOS_I(inode)->i_start = le16_to_cpu(de->start); |
| 389 | if (sbi->fat_bits == 32) |
| 390 | MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16); |
| 391 | |
| 392 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
| 393 | inode->i_size = le32_to_cpu(de->size); |
| 394 | inode->i_op = &fat_file_inode_operations; |
| 395 | inode->i_fop = &fat_file_operations; |
| 396 | inode->i_mapping->a_ops = &fat_aops; |
| 397 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 398 | } |
| 399 | if (de->attr & ATTR_SYS) { |
| 400 | if (sbi->options.sys_immutable) |
| 401 | inode->i_flags |= S_IMMUTABLE; |
| 402 | } |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 403 | fat_save_attrs(inode, de->attr); |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
| 406 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 407 | |
| 408 | fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | if (sbi->options.isvfat) { |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 410 | fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, |
| 411 | de->cdate, de->ctime_cs); |
| 412 | fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } else |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 414 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | struct inode *fat_build_inode(struct super_block *sb, |
| 420 | struct msdos_dir_entry *de, loff_t i_pos) |
| 421 | { |
| 422 | struct inode *inode; |
| 423 | int err; |
| 424 | |
| 425 | inode = fat_iget(sb, i_pos); |
| 426 | if (inode) |
| 427 | goto out; |
| 428 | inode = new_inode(sb); |
| 429 | if (!inode) { |
| 430 | inode = ERR_PTR(-ENOMEM); |
| 431 | goto out; |
| 432 | } |
| 433 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); |
| 434 | inode->i_version = 1; |
| 435 | err = fat_fill_inode(inode, de); |
| 436 | if (err) { |
| 437 | iput(inode); |
| 438 | inode = ERR_PTR(err); |
| 439 | goto out; |
| 440 | } |
| 441 | fat_attach(inode, i_pos); |
| 442 | insert_inode_hash(inode); |
| 443 | out: |
| 444 | return inode; |
| 445 | } |
| 446 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 447 | EXPORT_SYMBOL_GPL(fat_build_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 449 | static void fat_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { |
Mark Fasheh | fef2665 | 2005-09-09 13:01:31 -0700 | [diff] [blame] | 451 | truncate_inode_pages(&inode->i_data, 0); |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 452 | if (!inode->i_nlink) { |
| 453 | inode->i_size = 0; |
| 454 | fat_truncate_blocks(inode, 0); |
| 455 | } |
| 456 | invalidate_inode_buffers(inode); |
| 457 | end_writeback(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | fat_cache_inval_inode(inode); |
OGAWA Hirofumi | a993b54 | 2008-11-06 12:53:50 -0800 | [diff] [blame] | 459 | fat_detach(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 462 | static void fat_write_super(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | { |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 464 | lock_super(sb); |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 465 | sb->s_dirt = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | if (!(sb->s_flags & MS_RDONLY)) |
| 468 | fat_clusters_flush(sb); |
Christoph Hellwig | ebc1ac1 | 2009-05-11 23:35:03 +0200 | [diff] [blame] | 469 | unlock_super(sb); |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 470 | } |
| 471 | |
Christoph Hellwig | f83d6d4 | 2009-06-08 10:04:35 +0200 | [diff] [blame] | 472 | static int fat_sync_fs(struct super_block *sb, int wait) |
| 473 | { |
OGAWA Hirofumi | ed248b2 | 2009-09-20 01:31:58 +0900 | [diff] [blame] | 474 | int err = 0; |
Christoph Hellwig | f83d6d4 | 2009-06-08 10:04:35 +0200 | [diff] [blame] | 475 | |
OGAWA Hirofumi | ed248b2 | 2009-09-20 01:31:58 +0900 | [diff] [blame] | 476 | if (sb->s_dirt) { |
| 477 | lock_super(sb); |
| 478 | sb->s_dirt = 0; |
| 479 | err = fat_clusters_flush(sb); |
| 480 | unlock_super(sb); |
| 481 | } |
| 482 | |
| 483 | return err; |
Christoph Hellwig | f83d6d4 | 2009-06-08 10:04:35 +0200 | [diff] [blame] | 484 | } |
| 485 | |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 486 | static void fat_put_super(struct super_block *sb) |
| 487 | { |
| 488 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Christoph Hellwig | 8c85e12 | 2009-04-28 18:00:26 +0200 | [diff] [blame] | 490 | if (sb->s_dirt) |
| 491 | fat_write_super(sb); |
| 492 | |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 493 | iput(sbi->fat_inode); |
| 494 | |
Thomas Gleixner | 6d729e4 | 2009-08-16 21:05:08 +0000 | [diff] [blame] | 495 | unload_nls(sbi->nls_disk); |
| 496 | unload_nls(sbi->nls_io); |
| 497 | |
| 498 | if (sbi->options.iocharset != fat_default_iocharset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | kfree(sbi->options.iocharset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | sb->s_fs_info = NULL; |
| 502 | kfree(sbi); |
| 503 | } |
| 504 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 505 | static struct kmem_cache *fat_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
| 507 | static struct inode *fat_alloc_inode(struct super_block *sb) |
| 508 | { |
| 509 | struct msdos_inode_info *ei; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 510 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | if (!ei) |
| 512 | return NULL; |
| 513 | return &ei->vfs_inode; |
| 514 | } |
| 515 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 516 | static void fat_i_callback(struct rcu_head *head) |
| 517 | { |
| 518 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 519 | INIT_LIST_HEAD(&inode->i_dentry); |
| 520 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); |
| 521 | } |
| 522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | static void fat_destroy_inode(struct inode *inode) |
| 524 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 525 | call_rcu(&inode->i_rcu, fat_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
| 527 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 528 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | { |
| 530 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; |
| 531 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 532 | spin_lock_init(&ei->cache_lru_lock); |
| 533 | ei->nr_caches = 0; |
| 534 | ei->cache_valid_id = FAT_CACHE_VALID + 1; |
| 535 | INIT_LIST_HEAD(&ei->cache_lru); |
| 536 | INIT_HLIST_NODE(&ei->i_fat_hash); |
| 537 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | static int __init fat_init_inodecache(void) |
| 541 | { |
| 542 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", |
| 543 | sizeof(struct msdos_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 544 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 545 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 546 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | if (fat_inode_cachep == NULL) |
| 548 | return -ENOMEM; |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | static void __exit fat_destroy_inodecache(void) |
| 553 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 554 | kmem_cache_destroy(fat_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | static int fat_remount(struct super_block *sb, int *flags, char *data) |
| 558 | { |
| 559 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 560 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); |
| 561 | return 0; |
| 562 | } |
| 563 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 564 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | { |
Coly Li | aac49b75 | 2009-04-02 16:59:35 -0700 | [diff] [blame] | 566 | struct super_block *sb = dentry->d_sb; |
| 567 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 568 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
| 570 | /* If the count of free cluster is still unknown, counts it here. */ |
OGAWA Hirofumi | 606e423 | 2008-04-28 02:16:27 -0700 | [diff] [blame] | 571 | if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 572 | int err = fat_count_free_clusters(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | if (err) |
| 574 | return err; |
| 575 | } |
| 576 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 577 | buf->f_type = dentry->d_sb->s_magic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | buf->f_bsize = sbi->cluster_size; |
| 579 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; |
| 580 | buf->f_bfree = sbi->free_clusters; |
| 581 | buf->f_bavail = sbi->free_clusters; |
Coly Li | aac49b75 | 2009-04-02 16:59:35 -0700 | [diff] [blame] | 582 | buf->f_fsid.val[0] = (u32)id; |
| 583 | buf->f_fsid.val[1] = (u32)(id >> 32); |
OGAWA Hirofumi | f68e542 | 2011-04-12 21:08:39 +0900 | [diff] [blame] | 584 | buf->f_namelen = |
| 585 | (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
OGAWA Hirofumi | 9ca59f4 | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 590 | static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, |
| 591 | struct inode *inode) |
| 592 | { |
| 593 | loff_t i_pos; |
| 594 | #if BITS_PER_LONG == 32 |
| 595 | spin_lock(&sbi->inode_hash_lock); |
| 596 | #endif |
| 597 | i_pos = MSDOS_I(inode)->i_pos; |
| 598 | #if BITS_PER_LONG == 32 |
| 599 | spin_unlock(&sbi->inode_hash_lock); |
| 600 | #endif |
| 601 | return i_pos; |
| 602 | } |
| 603 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 604 | static int __fat_write_inode(struct inode *inode, int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
| 606 | struct super_block *sb = inode->i_sb; |
| 607 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 608 | struct buffer_head *bh; |
| 609 | struct msdos_dir_entry *raw_entry; |
| 610 | loff_t i_pos; |
Linus Torvalds | 5f22ca9 | 2008-08-20 08:31:19 -0700 | [diff] [blame] | 611 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
OGAWA Hirofumi | 9ca59f4 | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 613 | if (inode->i_ino == MSDOS_ROOT_INO) |
| 614 | return 0; |
| 615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | retry: |
OGAWA Hirofumi | 9ca59f4 | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 617 | i_pos = fat_i_pos_read(sbi, inode); |
| 618 | if (!i_pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | return 0; |
| 620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); |
| 622 | if (!bh) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 623 | fat_msg(sb, KERN_ERR, "unable to read inode block " |
| 624 | "for updating (i_pos %lld)", i_pos); |
Linus Torvalds | 5f22ca9 | 2008-08-20 08:31:19 -0700 | [diff] [blame] | 625 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | spin_lock(&sbi->inode_hash_lock); |
| 628 | if (i_pos != MSDOS_I(inode)->i_pos) { |
| 629 | spin_unlock(&sbi->inode_hash_lock); |
| 630 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | goto retry; |
| 632 | } |
| 633 | |
| 634 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) |
| 635 | [i_pos & (sbi->dir_per_block - 1)]; |
| 636 | if (S_ISDIR(inode->i_mode)) |
| 637 | raw_entry->size = 0; |
| 638 | else |
| 639 | raw_entry->size = cpu_to_le32(inode->i_size); |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 640 | raw_entry->attr = fat_make_attrs(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart); |
| 642 | raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16); |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 643 | fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, |
| 644 | &raw_entry->date, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | if (sbi->options.isvfat) { |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 646 | __le16 atime; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 647 | fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, |
| 648 | &raw_entry->cdate, &raw_entry->ctime_cs); |
| 649 | fat_time_unix2fat(sbi, &inode->i_atime, &atime, |
| 650 | &raw_entry->adate, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | spin_unlock(&sbi->inode_hash_lock); |
| 653 | mark_buffer_dirty(bh); |
Linus Torvalds | 5f22ca9 | 2008-08-20 08:31:19 -0700 | [diff] [blame] | 654 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | if (wait) |
| 656 | err = sync_dirty_buffer(bh); |
| 657 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | return err; |
| 659 | } |
| 660 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 661 | static int fat_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 662 | { |
| 663 | return __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
| 664 | } |
| 665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | int fat_sync_inode(struct inode *inode) |
| 667 | { |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 668 | return __fat_write_inode(inode, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 671 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt); |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 674 | static const struct super_operations fat_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | .alloc_inode = fat_alloc_inode, |
| 676 | .destroy_inode = fat_destroy_inode, |
| 677 | .write_inode = fat_write_inode, |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 678 | .evict_inode = fat_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | .put_super = fat_put_super, |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 680 | .write_super = fat_write_super, |
Christoph Hellwig | f83d6d4 | 2009-06-08 10:04:35 +0200 | [diff] [blame] | 681 | .sync_fs = fat_sync_fs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | .statfs = fat_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | .remount_fs = fat_remount, |
| 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | .show_options = fat_show_options, |
| 686 | }; |
| 687 | |
| 688 | /* |
| 689 | * a FAT file handle with fhtype 3 is |
| 690 | * 0/ i_ino - for fast, reliable lookup if still in the cache |
| 691 | * 1/ i_generation - to see if i_ino is still valid |
| 692 | * bit 0 == 0 iff directory |
| 693 | * 2/ i_pos(8-39) - if ino has changed, but still in cache |
| 694 | * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos |
| 695 | * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc |
| 696 | * |
| 697 | * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum |
| 698 | * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits |
| 699 | * of i_logstart is used to store the directory entry offset. |
| 700 | */ |
| 701 | |
Christoph Hellwig | 1305edad | 2007-10-21 16:42:11 -0700 | [diff] [blame] | 702 | static struct dentry *fat_fh_to_dentry(struct super_block *sb, |
| 703 | struct fid *fid, int fh_len, int fh_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
| 705 | struct inode *inode = NULL; |
Christoph Hellwig | 1305edad | 2007-10-21 16:42:11 -0700 | [diff] [blame] | 706 | u32 *fh = fid->raw; |
| 707 | |
| 708 | if (fh_len < 5 || fh_type != 3) |
| 709 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
David Howells | 17f95a7 | 2008-02-07 00:15:38 -0800 | [diff] [blame] | 711 | inode = ilookup(sb, fh[0]); |
| 712 | if (!inode || inode->i_generation != fh[1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | if (inode) |
| 714 | iput(inode); |
| 715 | inode = NULL; |
| 716 | } |
| 717 | if (!inode) { |
| 718 | loff_t i_pos; |
| 719 | int i_logstart = fh[3] & 0x0fffffff; |
| 720 | |
| 721 | i_pos = (loff_t)fh[2] << 8; |
| 722 | i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28); |
| 723 | |
| 724 | /* try 2 - see if i_pos is in F-d-c |
| 725 | * require i_logstart to be the same |
| 726 | * Will fail if you truncate and then re-write |
| 727 | */ |
| 728 | |
| 729 | inode = fat_iget(sb, i_pos); |
| 730 | if (inode && MSDOS_I(inode)->i_logstart != i_logstart) { |
| 731 | iput(inode); |
| 732 | inode = NULL; |
| 733 | } |
| 734 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 736 | /* |
| 737 | * For now, do nothing if the inode is not found. |
| 738 | * |
| 739 | * What we could do is: |
| 740 | * |
| 741 | * - follow the file starting at fh[4], and record the ".." entry, |
| 742 | * and the name of the fh[2] entry. |
| 743 | * - then follow the ".." file finding the next step up. |
| 744 | * |
| 745 | * This way we build a path to the root of the tree. If this works, we |
| 746 | * lookup the path and so get this inode into the cache. Finally try |
| 747 | * the fat_iget lookup again. If that fails, then we are totally out |
| 748 | * of luck. But all that is for another day |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | */ |
Al Viro | 3d23985 | 2010-12-18 10:44:00 -0500 | [diff] [blame] | 750 | return d_obtain_alias(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | static int |
| 754 | fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable) |
| 755 | { |
| 756 | int len = *lenp; |
| 757 | struct inode *inode = de->d_inode; |
| 758 | u32 ipos_h, ipos_m, ipos_l; |
| 759 | |
Aneesh Kumar K.V | 5fe0c23 | 2011-01-29 18:43:25 +0530 | [diff] [blame] | 760 | if (len < 5) { |
| 761 | *lenp = 5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | return 255; /* no room */ |
Aneesh Kumar K.V | 5fe0c23 | 2011-01-29 18:43:25 +0530 | [diff] [blame] | 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
| 765 | ipos_h = MSDOS_I(inode)->i_pos >> 8; |
| 766 | ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24; |
| 767 | ipos_l = (MSDOS_I(inode)->i_pos & 0x0f) << 28; |
| 768 | *lenp = 5; |
| 769 | fh[0] = inode->i_ino; |
| 770 | fh[1] = inode->i_generation; |
| 771 | fh[2] = ipos_h; |
| 772 | fh[3] = ipos_m | MSDOS_I(inode)->i_logstart; |
| 773 | spin_lock(&de->d_lock); |
| 774 | fh[4] = ipos_l | MSDOS_I(de->d_parent->d_inode)->i_logstart; |
| 775 | spin_unlock(&de->d_lock); |
| 776 | return 3; |
| 777 | } |
| 778 | |
| 779 | static struct dentry *fat_get_parent(struct dentry *child) |
| 780 | { |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 781 | struct super_block *sb = child->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | struct buffer_head *bh; |
| 783 | struct msdos_dir_entry *de; |
| 784 | loff_t i_pos; |
| 785 | struct dentry *parent; |
| 786 | struct inode *inode; |
| 787 | int err; |
| 788 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 789 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
| 791 | err = fat_get_dotdot_entry(child->d_inode, &bh, &de, &i_pos); |
| 792 | if (err) { |
| 793 | parent = ERR_PTR(err); |
| 794 | goto out; |
| 795 | } |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 796 | inode = fat_build_inode(sb, de, i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | brelse(bh); |
Christoph Hellwig | 4400372 | 2008-08-11 15:49:04 +0200 | [diff] [blame] | 798 | |
| 799 | parent = d_obtain_alias(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 801 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
| 803 | return parent; |
| 804 | } |
| 805 | |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 806 | static const struct export_operations fat_export_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | .encode_fh = fat_encode_fh, |
Christoph Hellwig | 1305edad | 2007-10-21 16:42:11 -0700 | [diff] [blame] | 808 | .fh_to_dentry = fat_fh_to_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | .get_parent = fat_get_parent, |
| 810 | }; |
| 811 | |
| 812 | static int fat_show_options(struct seq_file *m, struct vfsmount *mnt) |
| 813 | { |
| 814 | struct msdos_sb_info *sbi = MSDOS_SB(mnt->mnt_sb); |
| 815 | struct fat_mount_options *opts = &sbi->options; |
| 816 | int isvfat = opts->isvfat; |
| 817 | |
| 818 | if (opts->fs_uid != 0) |
| 819 | seq_printf(m, ",uid=%u", opts->fs_uid); |
| 820 | if (opts->fs_gid != 0) |
| 821 | seq_printf(m, ",gid=%u", opts->fs_gid); |
| 822 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); |
| 823 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 824 | if (opts->allow_utime) |
| 825 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | if (sbi->nls_disk) |
| 827 | seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); |
| 828 | if (isvfat) { |
| 829 | if (sbi->nls_io) |
| 830 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); |
| 831 | |
| 832 | switch (opts->shortname) { |
| 833 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: |
| 834 | seq_puts(m, ",shortname=win95"); |
| 835 | break; |
| 836 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: |
| 837 | seq_puts(m, ",shortname=winnt"); |
| 838 | break; |
| 839 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: |
| 840 | seq_puts(m, ",shortname=mixed"); |
| 841 | break; |
| 842 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: |
Paul Wise | 9552347 | 2009-08-01 21:30:31 +0900 | [diff] [blame] | 843 | seq_puts(m, ",shortname=lower"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | break; |
| 845 | default: |
| 846 | seq_puts(m, ",shortname=unknown"); |
| 847 | break; |
| 848 | } |
| 849 | } |
| 850 | if (opts->name_check != 'n') |
| 851 | seq_printf(m, ",check=%c", opts->name_check); |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 852 | if (opts->usefree) |
| 853 | seq_puts(m, ",usefree"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | if (opts->quiet) |
| 855 | seq_puts(m, ",quiet"); |
| 856 | if (opts->showexec) |
| 857 | seq_puts(m, ",showexec"); |
| 858 | if (opts->sys_immutable) |
| 859 | seq_puts(m, ",sys_immutable"); |
| 860 | if (!isvfat) { |
| 861 | if (opts->dotsOK) |
| 862 | seq_puts(m, ",dotsOK=yes"); |
| 863 | if (opts->nocase) |
| 864 | seq_puts(m, ",nocase"); |
| 865 | } else { |
| 866 | if (opts->utf8) |
| 867 | seq_puts(m, ",utf8"); |
| 868 | if (opts->unicode_xlate) |
| 869 | seq_puts(m, ",uni_xlate"); |
| 870 | if (!opts->numtail) |
| 871 | seq_puts(m, ",nonumtail"); |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 872 | if (opts->rodir) |
| 873 | seq_puts(m, ",rodir"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 875 | if (opts->flush) |
Miklos Szeredi | c1fca3b | 2008-02-08 04:21:42 -0800 | [diff] [blame] | 876 | seq_puts(m, ",flush"); |
Joe Peterson | b271e06 | 2008-07-25 01:46:47 -0700 | [diff] [blame] | 877 | if (opts->tz_utc) |
| 878 | seq_puts(m, ",tz=UTC"); |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 879 | if (opts->errors == FAT_ERRORS_CONT) |
| 880 | seq_puts(m, ",errors=continue"); |
| 881 | else if (opts->errors == FAT_ERRORS_PANIC) |
| 882 | seq_puts(m, ",errors=panic"); |
| 883 | else |
| 884 | seq_puts(m, ",errors=remount-ro"); |
Christoph Hellwig | 681142f | 2009-11-21 20:28:52 +0900 | [diff] [blame] | 885 | if (opts->discard) |
| 886 | seq_puts(m, ",discard"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
| 888 | return 0; |
| 889 | } |
| 890 | |
| 891 | enum { |
| 892 | Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 893 | Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, |
| 894 | Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, |
| 895 | Opt_immutable, Opt_dots, Opt_nodots, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
| 897 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, |
| 898 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 899 | Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, |
Christoph Hellwig | 681142f | 2009-11-21 20:28:52 +0900 | [diff] [blame] | 900 | Opt_err_panic, Opt_err_ro, Opt_discard, Opt_err, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | }; |
| 902 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 903 | static const match_table_t fat_tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | {Opt_check_r, "check=relaxed"}, |
| 905 | {Opt_check_s, "check=strict"}, |
| 906 | {Opt_check_n, "check=normal"}, |
| 907 | {Opt_check_r, "check=r"}, |
| 908 | {Opt_check_s, "check=s"}, |
| 909 | {Opt_check_n, "check=n"}, |
| 910 | {Opt_uid, "uid=%u"}, |
| 911 | {Opt_gid, "gid=%u"}, |
| 912 | {Opt_umask, "umask=%o"}, |
| 913 | {Opt_dmask, "dmask=%o"}, |
| 914 | {Opt_fmask, "fmask=%o"}, |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 915 | {Opt_allow_utime, "allow_utime=%o"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | {Opt_codepage, "codepage=%u"}, |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 917 | {Opt_usefree, "usefree"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | {Opt_nocase, "nocase"}, |
| 919 | {Opt_quiet, "quiet"}, |
| 920 | {Opt_showexec, "showexec"}, |
| 921 | {Opt_debug, "debug"}, |
| 922 | {Opt_immutable, "sys_immutable"}, |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 923 | {Opt_flush, "flush"}, |
| 924 | {Opt_tz_utc, "tz=UTC"}, |
| 925 | {Opt_err_cont, "errors=continue"}, |
| 926 | {Opt_err_panic, "errors=panic"}, |
| 927 | {Opt_err_ro, "errors=remount-ro"}, |
Christoph Hellwig | 681142f | 2009-11-21 20:28:52 +0900 | [diff] [blame] | 928 | {Opt_discard, "discard"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | {Opt_obsolate, "conv=binary"}, |
| 930 | {Opt_obsolate, "conv=text"}, |
| 931 | {Opt_obsolate, "conv=auto"}, |
| 932 | {Opt_obsolate, "conv=b"}, |
| 933 | {Opt_obsolate, "conv=t"}, |
| 934 | {Opt_obsolate, "conv=a"}, |
| 935 | {Opt_obsolate, "fat=%u"}, |
| 936 | {Opt_obsolate, "blocksize=%u"}, |
| 937 | {Opt_obsolate, "cvf_format=%20s"}, |
| 938 | {Opt_obsolate, "cvf_options=%100s"}, |
| 939 | {Opt_obsolate, "posix"}, |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 940 | {Opt_err, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | }; |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 942 | static const match_table_t msdos_tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | {Opt_nodots, "nodots"}, |
| 944 | {Opt_nodots, "dotsOK=no"}, |
| 945 | {Opt_dots, "dots"}, |
| 946 | {Opt_dots, "dotsOK=yes"}, |
| 947 | {Opt_err, NULL} |
| 948 | }; |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 949 | static const match_table_t vfat_tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | {Opt_charset, "iocharset=%s"}, |
| 951 | {Opt_shortname_lower, "shortname=lower"}, |
| 952 | {Opt_shortname_win95, "shortname=win95"}, |
| 953 | {Opt_shortname_winnt, "shortname=winnt"}, |
| 954 | {Opt_shortname_mixed, "shortname=mixed"}, |
| 955 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ |
| 956 | {Opt_utf8_no, "utf8=no"}, |
| 957 | {Opt_utf8_no, "utf8=false"}, |
| 958 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ |
| 959 | {Opt_utf8_yes, "utf8=yes"}, |
| 960 | {Opt_utf8_yes, "utf8=true"}, |
| 961 | {Opt_utf8_yes, "utf8"}, |
| 962 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ |
| 963 | {Opt_uni_xl_no, "uni_xlate=no"}, |
| 964 | {Opt_uni_xl_no, "uni_xlate=false"}, |
| 965 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ |
| 966 | {Opt_uni_xl_yes, "uni_xlate=yes"}, |
| 967 | {Opt_uni_xl_yes, "uni_xlate=true"}, |
| 968 | {Opt_uni_xl_yes, "uni_xlate"}, |
| 969 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ |
| 970 | {Opt_nonumtail_no, "nonumtail=no"}, |
| 971 | {Opt_nonumtail_no, "nonumtail=false"}, |
| 972 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ |
| 973 | {Opt_nonumtail_yes, "nonumtail=yes"}, |
| 974 | {Opt_nonumtail_yes, "nonumtail=true"}, |
| 975 | {Opt_nonumtail_yes, "nonumtail"}, |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 976 | {Opt_rodir, "rodir"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | {Opt_err, NULL} |
| 978 | }; |
| 979 | |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 980 | static int parse_options(struct super_block *sb, char *options, int is_vfat, |
| 981 | int silent, int *debug, struct fat_mount_options *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | { |
| 983 | char *p; |
| 984 | substring_t args[MAX_OPT_ARGS]; |
| 985 | int option; |
| 986 | char *iocharset; |
| 987 | |
| 988 | opts->isvfat = is_vfat; |
| 989 | |
David Howells | f0ce7ee | 2008-11-14 10:38:52 +1100 | [diff] [blame] | 990 | opts->fs_uid = current_uid(); |
| 991 | opts->fs_gid = current_gid(); |
OGAWA Hirofumi | 3e10760 | 2009-06-20 21:50:07 +0900 | [diff] [blame] | 992 | opts->fs_fmask = opts->fs_dmask = current_umask(); |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 993 | opts->allow_utime = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | opts->codepage = fat_default_codepage; |
| 995 | opts->iocharset = fat_default_iocharset; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 996 | if (is_vfat) { |
Paul Wise | 9552347 | 2009-08-01 21:30:31 +0900 | [diff] [blame] | 997 | opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 998 | opts->rodir = 0; |
| 999 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | opts->shortname = 0; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 1001 | opts->rodir = 1; |
| 1002 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | opts->name_check = 'n'; |
| 1004 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; |
| 1005 | opts->utf8 = opts->unicode_xlate = 0; |
| 1006 | opts->numtail = 1; |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 1007 | opts->usefree = opts->nocase = 0; |
Joe Peterson | b271e06 | 2008-07-25 01:46:47 -0700 | [diff] [blame] | 1008 | opts->tz_utc = 0; |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 1009 | opts->errors = FAT_ERRORS_RO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | *debug = 0; |
| 1011 | |
| 1012 | if (!options) |
OGAWA Hirofumi | 8d44d97 | 2008-07-25 01:46:41 -0700 | [diff] [blame] | 1013 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
| 1015 | while ((p = strsep(&options, ",")) != NULL) { |
| 1016 | int token; |
| 1017 | if (!*p) |
| 1018 | continue; |
| 1019 | |
| 1020 | token = match_token(p, fat_tokens, args); |
| 1021 | if (token == Opt_err) { |
| 1022 | if (is_vfat) |
| 1023 | token = match_token(p, vfat_tokens, args); |
| 1024 | else |
| 1025 | token = match_token(p, msdos_tokens, args); |
| 1026 | } |
| 1027 | switch (token) { |
| 1028 | case Opt_check_s: |
| 1029 | opts->name_check = 's'; |
| 1030 | break; |
| 1031 | case Opt_check_r: |
| 1032 | opts->name_check = 'r'; |
| 1033 | break; |
| 1034 | case Opt_check_n: |
| 1035 | opts->name_check = 'n'; |
| 1036 | break; |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 1037 | case Opt_usefree: |
| 1038 | opts->usefree = 1; |
| 1039 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | case Opt_nocase: |
| 1041 | if (!is_vfat) |
| 1042 | opts->nocase = 1; |
| 1043 | else { |
| 1044 | /* for backward compatibility */ |
| 1045 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 |
| 1046 | | VFAT_SFN_CREATE_WIN95; |
| 1047 | } |
| 1048 | break; |
| 1049 | case Opt_quiet: |
| 1050 | opts->quiet = 1; |
| 1051 | break; |
| 1052 | case Opt_showexec: |
| 1053 | opts->showexec = 1; |
| 1054 | break; |
| 1055 | case Opt_debug: |
| 1056 | *debug = 1; |
| 1057 | break; |
| 1058 | case Opt_immutable: |
| 1059 | opts->sys_immutable = 1; |
| 1060 | break; |
| 1061 | case Opt_uid: |
| 1062 | if (match_int(&args[0], &option)) |
| 1063 | return 0; |
| 1064 | opts->fs_uid = option; |
| 1065 | break; |
| 1066 | case Opt_gid: |
| 1067 | if (match_int(&args[0], &option)) |
| 1068 | return 0; |
| 1069 | opts->fs_gid = option; |
| 1070 | break; |
| 1071 | case Opt_umask: |
| 1072 | if (match_octal(&args[0], &option)) |
| 1073 | return 0; |
| 1074 | opts->fs_fmask = opts->fs_dmask = option; |
| 1075 | break; |
| 1076 | case Opt_dmask: |
| 1077 | if (match_octal(&args[0], &option)) |
| 1078 | return 0; |
| 1079 | opts->fs_dmask = option; |
| 1080 | break; |
| 1081 | case Opt_fmask: |
| 1082 | if (match_octal(&args[0], &option)) |
| 1083 | return 0; |
| 1084 | opts->fs_fmask = option; |
| 1085 | break; |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 1086 | case Opt_allow_utime: |
| 1087 | if (match_octal(&args[0], &option)) |
| 1088 | return 0; |
| 1089 | opts->allow_utime = option & (S_IWGRP | S_IWOTH); |
| 1090 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | case Opt_codepage: |
| 1092 | if (match_int(&args[0], &option)) |
| 1093 | return 0; |
| 1094 | opts->codepage = option; |
| 1095 | break; |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1096 | case Opt_flush: |
| 1097 | opts->flush = 1; |
| 1098 | break; |
Joe Peterson | b271e06 | 2008-07-25 01:46:47 -0700 | [diff] [blame] | 1099 | case Opt_tz_utc: |
| 1100 | opts->tz_utc = 1; |
| 1101 | break; |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 1102 | case Opt_err_cont: |
| 1103 | opts->errors = FAT_ERRORS_CONT; |
| 1104 | break; |
| 1105 | case Opt_err_panic: |
| 1106 | opts->errors = FAT_ERRORS_PANIC; |
| 1107 | break; |
| 1108 | case Opt_err_ro: |
| 1109 | opts->errors = FAT_ERRORS_RO; |
| 1110 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
| 1112 | /* msdos specific */ |
| 1113 | case Opt_dots: |
| 1114 | opts->dotsOK = 1; |
| 1115 | break; |
| 1116 | case Opt_nodots: |
| 1117 | opts->dotsOK = 0; |
| 1118 | break; |
| 1119 | |
| 1120 | /* vfat specific */ |
| 1121 | case Opt_charset: |
| 1122 | if (opts->iocharset != fat_default_iocharset) |
| 1123 | kfree(opts->iocharset); |
| 1124 | iocharset = match_strdup(&args[0]); |
| 1125 | if (!iocharset) |
| 1126 | return -ENOMEM; |
| 1127 | opts->iocharset = iocharset; |
| 1128 | break; |
| 1129 | case Opt_shortname_lower: |
| 1130 | opts->shortname = VFAT_SFN_DISPLAY_LOWER |
| 1131 | | VFAT_SFN_CREATE_WIN95; |
| 1132 | break; |
| 1133 | case Opt_shortname_win95: |
| 1134 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 |
| 1135 | | VFAT_SFN_CREATE_WIN95; |
| 1136 | break; |
| 1137 | case Opt_shortname_winnt: |
| 1138 | opts->shortname = VFAT_SFN_DISPLAY_WINNT |
| 1139 | | VFAT_SFN_CREATE_WINNT; |
| 1140 | break; |
| 1141 | case Opt_shortname_mixed: |
| 1142 | opts->shortname = VFAT_SFN_DISPLAY_WINNT |
| 1143 | | VFAT_SFN_CREATE_WIN95; |
| 1144 | break; |
| 1145 | case Opt_utf8_no: /* 0 or no or false */ |
| 1146 | opts->utf8 = 0; |
| 1147 | break; |
| 1148 | case Opt_utf8_yes: /* empty or 1 or yes or true */ |
| 1149 | opts->utf8 = 1; |
| 1150 | break; |
| 1151 | case Opt_uni_xl_no: /* 0 or no or false */ |
| 1152 | opts->unicode_xlate = 0; |
| 1153 | break; |
| 1154 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ |
| 1155 | opts->unicode_xlate = 1; |
| 1156 | break; |
| 1157 | case Opt_nonumtail_no: /* 0 or no or false */ |
| 1158 | opts->numtail = 1; /* negated option */ |
| 1159 | break; |
| 1160 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ |
| 1161 | opts->numtail = 0; /* negated option */ |
| 1162 | break; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 1163 | case Opt_rodir: |
| 1164 | opts->rodir = 1; |
| 1165 | break; |
Christoph Hellwig | 681142f | 2009-11-21 20:28:52 +0900 | [diff] [blame] | 1166 | case Opt_discard: |
| 1167 | opts->discard = 1; |
| 1168 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
| 1170 | /* obsolete mount options */ |
| 1171 | case Opt_obsolate: |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1172 | fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, " |
| 1173 | "not supported now", p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | break; |
| 1175 | /* unknown option */ |
| 1176 | default: |
Christoph Hellwig | 41a34a4 | 2005-11-08 21:34:57 -0800 | [diff] [blame] | 1177 | if (!silent) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1178 | fat_msg(sb, KERN_ERR, |
| 1179 | "Unrecognized mount option \"%s\" " |
| 1180 | "or missing value", p); |
Christoph Hellwig | 41a34a4 | 2005-11-08 21:34:57 -0800 | [diff] [blame] | 1181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | return -EINVAL; |
| 1183 | } |
| 1184 | } |
OGAWA Hirofumi | 8d44d97 | 2008-07-25 01:46:41 -0700 | [diff] [blame] | 1185 | |
| 1186 | out: |
Alexey Dobriyan | 4de151d | 2006-03-22 00:13:35 +0100 | [diff] [blame] | 1187 | /* UTF-8 doesn't provide FAT semantics */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | if (!strcmp(opts->iocharset, "utf8")) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1189 | fat_msg(sb, KERN_ERR, "utf8 is not a recommended IO charset" |
OGAWA Hirofumi | 8d44d97 | 2008-07-25 01:46:41 -0700 | [diff] [blame] | 1190 | " for FAT filesystems, filesystem will be " |
| 1191 | "case sensitive!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | } |
| 1193 | |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 1194 | /* If user doesn't specify allow_utime, it's initialized from dmask. */ |
| 1195 | if (opts->allow_utime == (unsigned short)-1) |
| 1196 | opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | if (opts->unicode_xlate) |
| 1198 | opts->utf8 = 0; |
| 1199 | |
| 1200 | return 0; |
| 1201 | } |
| 1202 | |
| 1203 | static int fat_read_root(struct inode *inode) |
| 1204 | { |
| 1205 | struct super_block *sb = inode->i_sb; |
| 1206 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 1207 | int error; |
| 1208 | |
| 1209 | MSDOS_I(inode)->i_pos = 0; |
| 1210 | inode->i_uid = sbi->options.fs_uid; |
| 1211 | inode->i_gid = sbi->options.fs_gid; |
| 1212 | inode->i_version++; |
| 1213 | inode->i_generation = 0; |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 1214 | inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | inode->i_op = sbi->dir_ops; |
| 1216 | inode->i_fop = &fat_dir_operations; |
| 1217 | if (sbi->fat_bits == 32) { |
| 1218 | MSDOS_I(inode)->i_start = sbi->root_cluster; |
| 1219 | error = fat_calc_dir_size(inode); |
| 1220 | if (error < 0) |
| 1221 | return error; |
| 1222 | } else { |
| 1223 | MSDOS_I(inode)->i_start = 0; |
| 1224 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); |
| 1225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
| 1227 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; |
| 1228 | MSDOS_I(inode)->i_logstart = 0; |
| 1229 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 1230 | |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 1231 | fat_save_attrs(inode, ATTR_DIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; |
| 1233 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; |
| 1234 | inode->i_nlink = fat_subdirs(inode)+2; |
| 1235 | |
| 1236 | return 0; |
| 1237 | } |
| 1238 | |
| 1239 | /* |
| 1240 | * Read the super block of an MS-DOS FS. |
| 1241 | */ |
OGAWA Hirofumi | 384f5c9 | 2011-04-12 21:08:37 +0900 | [diff] [blame] | 1242 | int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, |
Al Viro | 3d23985 | 2010-12-18 10:44:00 -0500 | [diff] [blame] | 1243 | void (*setup)(struct super_block *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | { |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1245 | struct inode *root_inode = NULL, *fat_inode = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | struct buffer_head *bh; |
| 1247 | struct fat_boot_sector *b; |
| 1248 | struct msdos_sb_info *sbi; |
| 1249 | u16 logical_sector_size; |
| 1250 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; |
| 1251 | int debug; |
| 1252 | unsigned int media; |
| 1253 | long error; |
| 1254 | char buf[50]; |
| 1255 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 1256 | /* |
| 1257 | * GFP_KERNEL is ok here, because while we do hold the |
| 1258 | * supeblock lock, memory pressure can't call back into |
| 1259 | * the filesystem, since we're only just about to mount |
| 1260 | * it and have no inodes etc active! |
| 1261 | */ |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 1262 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | if (!sbi) |
| 1264 | return -ENOMEM; |
| 1265 | sb->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | |
| 1267 | sb->s_flags |= MS_NODIRATIME; |
| 1268 | sb->s_magic = MSDOS_SUPER_MAGIC; |
| 1269 | sb->s_op = &fat_sops; |
| 1270 | sb->s_export_op = &fat_export_ops; |
OGAWA Hirofumi | aaa04b4 | 2010-05-24 14:33:12 -0700 | [diff] [blame] | 1271 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
| 1272 | DEFAULT_RATELIMIT_BURST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1274 | error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | if (error) |
| 1276 | goto out_fail; |
| 1277 | |
Al Viro | 3d23985 | 2010-12-18 10:44:00 -0500 | [diff] [blame] | 1278 | setup(sb); /* flavour-specific stuff that needs options */ |
| 1279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | error = -EIO; |
| 1281 | sb_min_blocksize(sb, 512); |
| 1282 | bh = sb_bread(sb, 0); |
| 1283 | if (bh == NULL) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1284 | fat_msg(sb, KERN_ERR, "unable to read boot sector"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | goto out_fail; |
| 1286 | } |
| 1287 | |
| 1288 | b = (struct fat_boot_sector *) bh->b_data; |
| 1289 | if (!b->reserved) { |
| 1290 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1291 | fat_msg(sb, KERN_ERR, "bogus number of reserved sectors"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | brelse(bh); |
| 1293 | goto out_invalid; |
| 1294 | } |
| 1295 | if (!b->fats) { |
| 1296 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1297 | fat_msg(sb, KERN_ERR, "bogus number of FAT structure"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | brelse(bh); |
| 1299 | goto out_invalid; |
| 1300 | } |
| 1301 | |
| 1302 | /* |
| 1303 | * Earlier we checked here that b->secs_track and b->head are nonzero, |
| 1304 | * but it turns out valid FAT filesystems can have zero there. |
| 1305 | */ |
| 1306 | |
| 1307 | media = b->media; |
Andrew Morton | 73f20e5 | 2008-04-28 02:16:30 -0700 | [diff] [blame] | 1308 | if (!fat_valid_media(media)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1310 | fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | media); |
| 1312 | brelse(bh); |
| 1313 | goto out_invalid; |
| 1314 | } |
Harvey Harrison | 803f445 | 2008-04-29 01:03:43 -0700 | [diff] [blame] | 1315 | logical_sector_size = get_unaligned_le16(&b->sector_size); |
Vignesh Babu BM | e7d709c | 2007-05-08 00:24:27 -0700 | [diff] [blame] | 1316 | if (!is_power_of_2(logical_sector_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | || (logical_sector_size < 512) |
Olof Johansson | 9f35485 | 2008-04-28 02:16:32 -0700 | [diff] [blame] | 1318 | || (logical_sector_size > 4096)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1320 | fat_msg(sb, KERN_ERR, "bogus logical sector size %u", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | logical_sector_size); |
| 1322 | brelse(bh); |
| 1323 | goto out_invalid; |
| 1324 | } |
| 1325 | sbi->sec_per_clus = b->sec_per_clus; |
Vignesh Babu BM | e7d709c | 2007-05-08 00:24:27 -0700 | [diff] [blame] | 1326 | if (!is_power_of_2(sbi->sec_per_clus)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1328 | fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | sbi->sec_per_clus); |
| 1330 | brelse(bh); |
| 1331 | goto out_invalid; |
| 1332 | } |
| 1333 | |
| 1334 | if (logical_sector_size < sb->s_blocksize) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1335 | fat_msg(sb, KERN_ERR, "logical sector size too small for device" |
| 1336 | " (logical sector size = %u)", logical_sector_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | brelse(bh); |
| 1338 | goto out_fail; |
| 1339 | } |
| 1340 | if (logical_sector_size > sb->s_blocksize) { |
| 1341 | brelse(bh); |
| 1342 | |
| 1343 | if (!sb_set_blocksize(sb, logical_sector_size)) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1344 | fat_msg(sb, KERN_ERR, "unable to set blocksize %u", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | logical_sector_size); |
| 1346 | goto out_fail; |
| 1347 | } |
| 1348 | bh = sb_bread(sb, 0); |
| 1349 | if (bh == NULL) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1350 | fat_msg(sb, KERN_ERR, "unable to read boot sector" |
| 1351 | " (logical sector size = %lu)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | sb->s_blocksize); |
| 1353 | goto out_fail; |
| 1354 | } |
| 1355 | b = (struct fat_boot_sector *) bh->b_data; |
| 1356 | } |
| 1357 | |
| 1358 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; |
| 1359 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; |
| 1360 | sbi->fats = b->fats; |
| 1361 | sbi->fat_bits = 0; /* Don't know yet */ |
| 1362 | sbi->fat_start = le16_to_cpu(b->reserved); |
| 1363 | sbi->fat_length = le16_to_cpu(b->fat_length); |
| 1364 | sbi->root_cluster = 0; |
| 1365 | sbi->free_clusters = -1; /* Don't know yet */ |
OGAWA Hirofumi | 606e423 | 2008-04-28 02:16:27 -0700 | [diff] [blame] | 1366 | sbi->free_clus_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | sbi->prev_free = FAT_START_ENT; |
| 1368 | |
| 1369 | if (!sbi->fat_length && b->fat32_length) { |
| 1370 | struct fat_boot_fsinfo *fsinfo; |
| 1371 | struct buffer_head *fsinfo_bh; |
| 1372 | |
| 1373 | /* Must be FAT32 */ |
| 1374 | sbi->fat_bits = 32; |
| 1375 | sbi->fat_length = le32_to_cpu(b->fat32_length); |
| 1376 | sbi->root_cluster = le32_to_cpu(b->root_cluster); |
| 1377 | |
| 1378 | sb->s_maxbytes = 0xffffffff; |
| 1379 | |
| 1380 | /* MC - if info_sector is 0, don't multiply by 0 */ |
| 1381 | sbi->fsinfo_sector = le16_to_cpu(b->info_sector); |
| 1382 | if (sbi->fsinfo_sector == 0) |
| 1383 | sbi->fsinfo_sector = 1; |
| 1384 | |
| 1385 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); |
| 1386 | if (fsinfo_bh == NULL) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1387 | fat_msg(sb, KERN_ERR, "bread failed, FSINFO block" |
| 1388 | " (sector = %lu)", sbi->fsinfo_sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | brelse(bh); |
| 1390 | goto out_fail; |
| 1391 | } |
| 1392 | |
| 1393 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; |
| 1394 | if (!IS_FSINFO(fsinfo)) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1395 | fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: " |
| 1396 | "0x%08x, 0x%08x (sector = %lu)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | le32_to_cpu(fsinfo->signature1), |
| 1398 | le32_to_cpu(fsinfo->signature2), |
| 1399 | sbi->fsinfo_sector); |
| 1400 | } else { |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 1401 | if (sbi->options.usefree) |
OGAWA Hirofumi | 606e423 | 2008-04-28 02:16:27 -0700 | [diff] [blame] | 1402 | sbi->free_clus_valid = 1; |
| 1403 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
| 1405 | } |
| 1406 | |
| 1407 | brelse(fsinfo_bh); |
| 1408 | } |
| 1409 | |
| 1410 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); |
| 1411 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; |
| 1412 | |
| 1413 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; |
Harvey Harrison | 803f445 | 2008-04-29 01:03:43 -0700 | [diff] [blame] | 1414 | sbi->dir_entries = get_unaligned_le16(&b->dir_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
| 1416 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1417 | fat_msg(sb, KERN_ERR, "bogus directroy-entries per block" |
| 1418 | " (%u)", sbi->dir_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | brelse(bh); |
| 1420 | goto out_invalid; |
| 1421 | } |
| 1422 | |
| 1423 | rootdir_sectors = sbi->dir_entries |
| 1424 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; |
| 1425 | sbi->data_start = sbi->dir_start + rootdir_sectors; |
Harvey Harrison | 803f445 | 2008-04-29 01:03:43 -0700 | [diff] [blame] | 1426 | total_sectors = get_unaligned_le16(&b->sectors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | if (total_sectors == 0) |
| 1428 | total_sectors = le32_to_cpu(b->total_sect); |
| 1429 | |
| 1430 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; |
| 1431 | |
| 1432 | if (sbi->fat_bits != 32) |
| 1433 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; |
| 1434 | |
| 1435 | /* check that FAT table does not overflow */ |
| 1436 | fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; |
| 1437 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); |
| 1438 | if (total_clusters > MAX_FAT(sb)) { |
| 1439 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1440 | fat_msg(sb, KERN_ERR, "count of clusters too big (%u)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | total_clusters); |
| 1442 | brelse(bh); |
| 1443 | goto out_invalid; |
| 1444 | } |
| 1445 | |
| 1446 | sbi->max_cluster = total_clusters + FAT_START_ENT; |
| 1447 | /* check the free_clusters, it's not necessarily correct */ |
| 1448 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) |
| 1449 | sbi->free_clusters = -1; |
| 1450 | /* check the prev_free, it's not necessarily correct */ |
| 1451 | sbi->prev_free %= sbi->max_cluster; |
| 1452 | if (sbi->prev_free < FAT_START_ENT) |
| 1453 | sbi->prev_free = FAT_START_ENT; |
| 1454 | |
| 1455 | brelse(bh); |
| 1456 | |
| 1457 | /* set up enough so that it can read an inode */ |
| 1458 | fat_hash_init(sb); |
| 1459 | fat_ent_access_init(sb); |
| 1460 | |
| 1461 | /* |
| 1462 | * The low byte of FAT's first entry must have same value with |
| 1463 | * media-field. But in real world, too many devices is |
| 1464 | * writing wrong value. So, removed that validity check. |
| 1465 | * |
| 1466 | * if (FAT_FIRST_ENT(sb, media) != first) |
| 1467 | */ |
| 1468 | |
| 1469 | error = -EINVAL; |
| 1470 | sprintf(buf, "cp%d", sbi->options.codepage); |
| 1471 | sbi->nls_disk = load_nls(buf); |
| 1472 | if (!sbi->nls_disk) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1473 | fat_msg(sb, KERN_ERR, "codepage %s not found", buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | goto out_fail; |
| 1475 | } |
| 1476 | |
| 1477 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ |
| 1478 | if (sbi->options.isvfat) { |
| 1479 | sbi->nls_io = load_nls(sbi->options.iocharset); |
| 1480 | if (!sbi->nls_io) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1481 | fat_msg(sb, KERN_ERR, "IO charset %s not found", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | sbi->options.iocharset); |
| 1483 | goto out_fail; |
| 1484 | } |
| 1485 | } |
| 1486 | |
| 1487 | error = -ENOMEM; |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1488 | fat_inode = new_inode(sb); |
| 1489 | if (!fat_inode) |
| 1490 | goto out_fail; |
| 1491 | MSDOS_I(fat_inode)->i_pos = 0; |
| 1492 | sbi->fat_inode = fat_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | root_inode = new_inode(sb); |
| 1494 | if (!root_inode) |
| 1495 | goto out_fail; |
| 1496 | root_inode->i_ino = MSDOS_ROOT_INO; |
| 1497 | root_inode->i_version = 1; |
| 1498 | error = fat_read_root(root_inode); |
| 1499 | if (error < 0) |
| 1500 | goto out_fail; |
| 1501 | error = -ENOMEM; |
| 1502 | insert_inode_hash(root_inode); |
| 1503 | sb->s_root = d_alloc_root(root_inode); |
| 1504 | if (!sb->s_root) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1505 | fat_msg(sb, KERN_ERR, "get root inode failed"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | goto out_fail; |
| 1507 | } |
| 1508 | |
| 1509 | return 0; |
| 1510 | |
| 1511 | out_invalid: |
| 1512 | error = -EINVAL; |
| 1513 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1514 | fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | |
| 1516 | out_fail: |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1517 | if (fat_inode) |
| 1518 | iput(fat_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | if (root_inode) |
| 1520 | iput(root_inode); |
OGAWA Hirofumi | 1bdb6f9 | 2010-03-16 05:48:09 +0900 | [diff] [blame] | 1521 | unload_nls(sbi->nls_io); |
| 1522 | unload_nls(sbi->nls_disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | if (sbi->options.iocharset != fat_default_iocharset) |
| 1524 | kfree(sbi->options.iocharset); |
| 1525 | sb->s_fs_info = NULL; |
| 1526 | kfree(sbi); |
| 1527 | return error; |
| 1528 | } |
| 1529 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 1530 | EXPORT_SYMBOL_GPL(fat_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1532 | /* |
| 1533 | * helper function for fat_flush_inodes. This writes both the inode |
| 1534 | * and the file data blocks, waiting for in flight data blocks before |
| 1535 | * the start of the call. It does not wait for any io started |
| 1536 | * during the call |
| 1537 | */ |
| 1538 | static int writeback_inode(struct inode *inode) |
| 1539 | { |
| 1540 | |
| 1541 | int ret; |
| 1542 | struct address_space *mapping = inode->i_mapping; |
| 1543 | struct writeback_control wbc = { |
| 1544 | .sync_mode = WB_SYNC_NONE, |
| 1545 | .nr_to_write = 0, |
| 1546 | }; |
| 1547 | /* if we used WB_SYNC_ALL, sync_inode waits for the io for the |
| 1548 | * inode to finish. So WB_SYNC_NONE is sent down to sync_inode |
| 1549 | * and filemap_fdatawrite is used for the data blocks |
| 1550 | */ |
| 1551 | ret = sync_inode(inode, &wbc); |
| 1552 | if (!ret) |
| 1553 | ret = filemap_fdatawrite(mapping); |
| 1554 | return ret; |
| 1555 | } |
| 1556 | |
| 1557 | /* |
| 1558 | * write data and metadata corresponding to i1 and i2. The io is |
| 1559 | * started but we do not wait for any of it to finish. |
| 1560 | * |
| 1561 | * filemap_flush is used for the block device, so if there is a dirty |
| 1562 | * page for a block already in flight, we will not wait and start the |
| 1563 | * io over again |
| 1564 | */ |
| 1565 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) |
| 1566 | { |
| 1567 | int ret = 0; |
| 1568 | if (!MSDOS_SB(sb)->options.flush) |
| 1569 | return 0; |
| 1570 | if (i1) |
| 1571 | ret = writeback_inode(i1); |
| 1572 | if (!ret && i2) |
| 1573 | ret = writeback_inode(i2); |
Eric Sesterhenn | 97e860d | 2006-10-11 01:21:59 -0700 | [diff] [blame] | 1574 | if (!ret) { |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1575 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
| 1576 | ret = filemap_flush(mapping); |
| 1577 | } |
| 1578 | return ret; |
| 1579 | } |
| 1580 | EXPORT_SYMBOL_GPL(fat_flush_inodes); |
| 1581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | static int __init init_fat_fs(void) |
| 1583 | { |
Pekka J Enberg | 532a39a | 2005-06-30 02:59:01 -0700 | [diff] [blame] | 1584 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
Pekka J Enberg | 532a39a | 2005-06-30 02:59:01 -0700 | [diff] [blame] | 1586 | err = fat_cache_init(); |
| 1587 | if (err) |
| 1588 | return err; |
| 1589 | |
| 1590 | err = fat_init_inodecache(); |
| 1591 | if (err) |
| 1592 | goto failed; |
| 1593 | |
| 1594 | return 0; |
| 1595 | |
| 1596 | failed: |
| 1597 | fat_cache_destroy(); |
| 1598 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | } |
| 1600 | |
| 1601 | static void __exit exit_fat_fs(void) |
| 1602 | { |
| 1603 | fat_cache_destroy(); |
| 1604 | fat_destroy_inodecache(); |
| 1605 | } |
| 1606 | |
| 1607 | module_init(init_fat_fs) |
| 1608 | module_exit(exit_fat_fs) |
| 1609 | |
| 1610 | MODULE_LICENSE("GPL"); |