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> |
| 21 | #include <linux/mount.h> |
| 22 | #include <linux/vfs.h> |
| 23 | #include <linux/parser.h> |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 24 | #include <linux/uio.h> |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 25 | #include <linux/writeback.h> |
Vignesh Babu BM | e7d709c | 2007-05-08 00:24:27 -0700 | [diff] [blame] | 26 | #include <linux/log2.h> |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 27 | #include <linux/hash.h> |
Namjae Jeon | f562146 | 2012-12-17 16:02:56 -0800 | [diff] [blame] | 28 | #include <linux/blkdev.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 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 37 | #define KB_IN_SECTORS 2 |
| 38 | |
| 39 | /* |
| 40 | * A deserialized copy of the on-disk structure laid out in struct |
| 41 | * fat_boot_sector. |
| 42 | */ |
| 43 | struct fat_bios_param_block { |
| 44 | u16 fat_sector_size; |
| 45 | u8 fat_sec_per_clus; |
| 46 | u16 fat_reserved; |
| 47 | u8 fat_fats; |
| 48 | u16 fat_dir_entries; |
| 49 | u16 fat_sectors; |
| 50 | u16 fat_fat_length; |
| 51 | u32 fat_total_sect; |
| 52 | |
| 53 | u8 fat16_state; |
| 54 | u32 fat16_vol_id; |
| 55 | |
| 56 | u32 fat32_length; |
| 57 | u32 fat32_root_cluster; |
| 58 | u16 fat32_info_sector; |
| 59 | u8 fat32_state; |
| 60 | u32 fat32_vol_id; |
| 61 | }; |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; |
| 64 | static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; |
| 65 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 66 | static struct fat_floppy_defaults { |
| 67 | unsigned nr_sectors; |
| 68 | unsigned sec_per_clus; |
| 69 | unsigned dir_entries; |
| 70 | unsigned media; |
| 71 | unsigned fat_length; |
| 72 | } floppy_defaults[] = { |
| 73 | { |
| 74 | .nr_sectors = 160 * KB_IN_SECTORS, |
| 75 | .sec_per_clus = 1, |
| 76 | .dir_entries = 64, |
| 77 | .media = 0xFE, |
| 78 | .fat_length = 1, |
| 79 | }, |
| 80 | { |
| 81 | .nr_sectors = 180 * KB_IN_SECTORS, |
| 82 | .sec_per_clus = 1, |
| 83 | .dir_entries = 64, |
| 84 | .media = 0xFC, |
| 85 | .fat_length = 2, |
| 86 | }, |
| 87 | { |
| 88 | .nr_sectors = 320 * KB_IN_SECTORS, |
| 89 | .sec_per_clus = 2, |
| 90 | .dir_entries = 112, |
| 91 | .media = 0xFF, |
| 92 | .fat_length = 1, |
| 93 | }, |
| 94 | { |
| 95 | .nr_sectors = 360 * KB_IN_SECTORS, |
| 96 | .sec_per_clus = 2, |
| 97 | .dir_entries = 112, |
| 98 | .media = 0xFD, |
| 99 | .fat_length = 2, |
| 100 | }, |
| 101 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | static int fat_add_cluster(struct inode *inode) |
| 104 | { |
| 105 | int err, cluster; |
| 106 | |
| 107 | err = fat_alloc_clusters(inode, &cluster, 1); |
| 108 | if (err) |
| 109 | return err; |
| 110 | /* FIXME: this cluster should be added after data of this |
| 111 | * cluster is writed */ |
| 112 | err = fat_chain_add(inode, cluster, 1); |
| 113 | if (err) |
| 114 | fat_free_clusters(inode, cluster); |
| 115 | return err; |
| 116 | } |
| 117 | |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 118 | static inline int __fat_get_block(struct inode *inode, sector_t iblock, |
| 119 | unsigned long *max_blocks, |
| 120 | struct buffer_head *bh_result, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
| 122 | struct super_block *sb = inode->i_sb; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 123 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 124 | unsigned long mapped_blocks; |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 125 | sector_t phys; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 126 | int err, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
OGAWA Hirofumi | 2bdf67e | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 128 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | if (err) |
| 130 | return err; |
| 131 | if (phys) { |
| 132 | map_bh(bh_result, sb, phys); |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 133 | *max_blocks = min(mapped_blocks, *max_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | return 0; |
| 135 | } |
| 136 | if (!create) |
| 137 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 140 | fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)", |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 141 | MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | return -EIO; |
| 143 | } |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 144 | |
| 145 | offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); |
| 146 | if (!offset) { |
| 147 | /* TODO: multiple cluster allocation would be desirable. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | err = fat_add_cluster(inode); |
| 149 | if (err) |
| 150 | return err; |
| 151 | } |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 152 | /* available blocks on this cluster */ |
| 153 | mapped_blocks = sbi->sec_per_clus - offset; |
| 154 | |
| 155 | *max_blocks = min(mapped_blocks, *max_blocks); |
| 156 | MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; |
| 157 | |
OGAWA Hirofumi | 2bdf67e | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 158 | err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | if (err) |
| 160 | return err; |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 161 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 162 | BUG_ON(!phys); |
| 163 | BUG_ON(*max_blocks != mapped_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | set_buffer_new(bh_result); |
| 165 | map_bh(bh_result, sb, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static int fat_get_block(struct inode *inode, sector_t iblock, |
| 171 | struct buffer_head *bh_result, int create) |
| 172 | { |
OGAWA Hirofumi | 6a1d980 | 2006-09-27 01:50:45 -0700 | [diff] [blame] | 173 | struct super_block *sb = inode->i_sb; |
| 174 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
| 175 | int err; |
| 176 | |
| 177 | err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); |
| 178 | if (err) |
| 179 | return err; |
| 180 | bh_result->b_size = max_blocks << sb->s_blocksize_bits; |
| 181 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 182 | } |
| 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | static int fat_writepage(struct page *page, struct writeback_control *wbc) |
| 185 | { |
| 186 | return block_write_full_page(page, fat_get_block, wbc); |
| 187 | } |
| 188 | |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 189 | static int fat_writepages(struct address_space *mapping, |
| 190 | struct writeback_control *wbc) |
| 191 | { |
| 192 | return mpage_writepages(mapping, wbc, fat_get_block); |
| 193 | } |
| 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | static int fat_readpage(struct file *file, struct page *page) |
| 196 | { |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 197 | return mpage_readpage(page, fat_get_block); |
| 198 | } |
| 199 | |
| 200 | static int fat_readpages(struct file *file, struct address_space *mapping, |
| 201 | struct list_head *pages, unsigned nr_pages) |
| 202 | { |
| 203 | return mpage_readpages(mapping, pages, nr_pages, fat_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 206 | static void fat_write_failed(struct address_space *mapping, loff_t to) |
| 207 | { |
| 208 | struct inode *inode = mapping->host; |
| 209 | |
| 210 | if (to > inode->i_size) { |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 211 | truncate_pagecache(inode, inode->i_size); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 212 | fat_truncate_blocks(inode, inode->i_size); |
| 213 | } |
| 214 | } |
| 215 | |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 216 | static int fat_write_begin(struct file *file, struct address_space *mapping, |
| 217 | loff_t pos, unsigned len, unsigned flags, |
| 218 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 220 | int err; |
| 221 | |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 222 | *pagep = NULL; |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 223 | err = cont_write_begin(file, mapping, pos, len, flags, |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 224 | pagep, fsdata, fat_get_block, |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 225 | &MSDOS_I(mapping->host)->mmu_private); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 226 | if (err < 0) |
| 227 | fat_write_failed(mapping, pos + len); |
| 228 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 231 | static int fat_write_end(struct file *file, struct address_space *mapping, |
| 232 | loff_t pos, unsigned len, unsigned copied, |
| 233 | struct page *pagep, void *fsdata) |
OGAWA Hirofumi | ef40226 | 2005-09-16 19:28:13 -0700 | [diff] [blame] | 234 | { |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 235 | struct inode *inode = mapping->host; |
| 236 | int err; |
| 237 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 238 | if (err < len) |
| 239 | fat_write_failed(mapping, pos + len); |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 240 | if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { |
OGAWA Hirofumi | ef40226 | 2005-09-16 19:28:13 -0700 | [diff] [blame] | 241 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
| 242 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; |
| 243 | mark_inode_dirty(inode); |
| 244 | } |
| 245 | return err; |
| 246 | } |
| 247 | |
Omar Sandoval | 22c6186 | 2015-03-16 04:33:53 -0700 | [diff] [blame^] | 248 | static ssize_t fat_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
Al Viro | d8d3d94 | 2014-03-04 21:27:34 -0500 | [diff] [blame] | 249 | loff_t offset) |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 250 | { |
| 251 | struct file *file = iocb->ki_filp; |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 252 | struct address_space *mapping = file->f_mapping; |
| 253 | struct inode *inode = mapping->host; |
Al Viro | a6cbcd4 | 2014-03-04 22:38:00 -0500 | [diff] [blame] | 254 | size_t count = iov_iter_count(iter); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 255 | ssize_t ret; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 256 | |
Omar Sandoval | 6f67376 | 2015-03-16 04:33:52 -0700 | [diff] [blame] | 257 | if (iov_iter_rw(iter) == WRITE) { |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 258 | /* |
Nick Piggin | 4e02ed4 | 2008-10-29 14:00:55 -0700 | [diff] [blame] | 259 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 260 | * so we need to update the ->mmu_private to block boundary. |
| 261 | * |
| 262 | * But we must fill the remaining area or hole by nul for |
| 263 | * updating ->mmu_private. |
OGAWA Hirofumi | 94412a9 | 2007-02-20 13:57:55 -0800 | [diff] [blame] | 264 | * |
| 265 | * Return 0, and fallback to normal buffered write. |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 266 | */ |
Al Viro | a6cbcd4 | 2014-03-04 22:38:00 -0500 | [diff] [blame] | 267 | loff_t size = offset + count; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 268 | if (MSDOS_I(inode)->mmu_private < size) |
OGAWA Hirofumi | 94412a9 | 2007-02-20 13:57:55 -0800 | [diff] [blame] | 269 | return 0; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | /* |
| 273 | * FAT need to use the DIO_LOCKING for avoiding the race |
| 274 | * condition of fat_get_block() and ->truncate(). |
| 275 | */ |
Omar Sandoval | 17f8c84 | 2015-03-16 04:33:50 -0700 | [diff] [blame] | 276 | ret = blockdev_direct_IO(iocb, inode, iter, offset, fat_get_block); |
Omar Sandoval | 6f67376 | 2015-03-16 04:33:52 -0700 | [diff] [blame] | 277 | if (ret < 0 && iov_iter_rw(iter) == WRITE) |
Al Viro | a6cbcd4 | 2014-03-04 22:38:00 -0500 | [diff] [blame] | 278 | fat_write_failed(mapping, offset + count); |
npiggin@suse.de | 459f6ed | 2010-05-27 01:05:38 +1000 | [diff] [blame] | 279 | |
| 280 | return ret; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 281 | } |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | static sector_t _fat_bmap(struct address_space *mapping, sector_t block) |
| 284 | { |
OGAWA Hirofumi | fa93ca1 | 2008-11-06 12:53:56 -0800 | [diff] [blame] | 285 | sector_t blocknr; |
| 286 | |
| 287 | /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ |
Christoph Hellwig | 5826869 | 2011-06-24 14:29:40 -0400 | [diff] [blame] | 288 | down_read(&MSDOS_I(mapping->host)->truncate_lock); |
OGAWA Hirofumi | fa93ca1 | 2008-11-06 12:53:56 -0800 | [diff] [blame] | 289 | blocknr = generic_block_bmap(mapping, block, fat_get_block); |
Christoph Hellwig | 5826869 | 2011-06-24 14:29:40 -0400 | [diff] [blame] | 290 | up_read(&MSDOS_I(mapping->host)->truncate_lock); |
OGAWA Hirofumi | fa93ca1 | 2008-11-06 12:53:56 -0800 | [diff] [blame] | 291 | |
| 292 | return blocknr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
Namjae Jeon | c0ef0cc | 2014-12-12 16:57:26 -0800 | [diff] [blame] | 295 | /* |
| 296 | * fat_block_truncate_page() zeroes out a mapping from file offset `from' |
| 297 | * up to the end of the block which corresponds to `from'. |
| 298 | * This is required during truncate to physically zeroout the tail end |
| 299 | * of that block so it doesn't yield old data if the file is later grown. |
| 300 | * Also, avoid causing failure from fsx for cases of "data past EOF" |
| 301 | */ |
| 302 | int fat_block_truncate_page(struct inode *inode, loff_t from) |
| 303 | { |
| 304 | return block_truncate_page(inode->i_mapping, from, fat_get_block); |
| 305 | } |
| 306 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 307 | static const struct address_space_operations fat_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | .readpage = fat_readpage, |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 309 | .readpages = fat_readpages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | .writepage = fat_writepage, |
OGAWA Hirofumi | a5425d2 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 311 | .writepages = fat_writepages, |
Nick Piggin | d7777a2 | 2007-10-16 01:25:08 -0700 | [diff] [blame] | 312 | .write_begin = fat_write_begin, |
| 313 | .write_end = fat_write_end, |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 314 | .direct_IO = fat_direct_IO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | .bmap = _fat_bmap |
| 316 | }; |
| 317 | |
| 318 | /* |
| 319 | * New FAT inode stuff. We do the following: |
| 320 | * a) i_ino is constant and has nothing with on-disk location. |
| 321 | * b) FAT manages its own cache of directory entries. |
| 322 | * c) *This* cache is indexed by on-disk location. |
| 323 | * d) inode has an associated directory entry, all right, but |
| 324 | * it may be unhashed. |
| 325 | * e) currently entries are stored within struct inode. That should |
| 326 | * change. |
| 327 | * f) we deal with races in the following way: |
| 328 | * 1. readdir() and lookup() do FAT-dir-cache lookup. |
| 329 | * 2. rename() unhashes the F-d-c entry and rehashes it in |
| 330 | * a new place. |
| 331 | * 3. unlink() and rmdir() unhash F-d-c entry. |
| 332 | * 4. fat_write_inode() checks whether the thing is unhashed. |
| 333 | * If it is we silently return. If it isn't we do bread(), |
| 334 | * check if the location is still valid and retry if it |
| 335 | * isn't. Otherwise we do changes. |
| 336 | * 5. Spinlock is used to protect hash/unhash/location check/lookup |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 337 | * 6. fat_evict_inode() unhashes the F-d-c entry. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | * 7. lookup() and readdir() do igrab() if they find a F-d-c entry |
| 339 | * and consider negative result as cache miss. |
| 340 | */ |
| 341 | |
| 342 | static void fat_hash_init(struct super_block *sb) |
| 343 | { |
| 344 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 345 | int i; |
| 346 | |
| 347 | spin_lock_init(&sbi->inode_hash_lock); |
| 348 | for (i = 0; i < FAT_HASH_SIZE; i++) |
| 349 | INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); |
| 350 | } |
| 351 | |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 352 | static inline unsigned long fat_hash(loff_t i_pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | { |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 354 | return hash_32(i_pos, FAT_HASH_BITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 357 | static void dir_hash_init(struct super_block *sb) |
| 358 | { |
| 359 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 360 | int i; |
| 361 | |
| 362 | spin_lock_init(&sbi->dir_hash_lock); |
| 363 | for (i = 0; i < FAT_HASH_SIZE; i++) |
| 364 | INIT_HLIST_HEAD(&sbi->dir_hashtable[i]); |
| 365 | } |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | void fat_attach(struct inode *inode, loff_t i_pos) |
| 368 | { |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 369 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 371 | if (inode->i_ino != MSDOS_ROOT_INO) { |
| 372 | struct hlist_head *head = sbi->inode_hashtable |
| 373 | + fat_hash(i_pos); |
| 374 | |
| 375 | spin_lock(&sbi->inode_hash_lock); |
| 376 | MSDOS_I(inode)->i_pos = i_pos; |
| 377 | hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); |
| 378 | spin_unlock(&sbi->inode_hash_lock); |
| 379 | } |
| 380 | |
| 381 | /* If NFS support is enabled, cache the mapping of start cluster |
| 382 | * to directory inode. This is used during reconnection of |
| 383 | * dentries to the filesystem root. |
| 384 | */ |
| 385 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { |
| 386 | struct hlist_head *d_head = sbi->dir_hashtable; |
| 387 | d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart); |
| 388 | |
| 389 | spin_lock(&sbi->dir_hash_lock); |
| 390 | hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head); |
| 391 | spin_unlock(&sbi->dir_hash_lock); |
| 392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 394 | EXPORT_SYMBOL_GPL(fat_attach); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | void fat_detach(struct inode *inode) |
| 397 | { |
| 398 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 399 | spin_lock(&sbi->inode_hash_lock); |
| 400 | MSDOS_I(inode)->i_pos = 0; |
| 401 | hlist_del_init(&MSDOS_I(inode)->i_fat_hash); |
| 402 | spin_unlock(&sbi->inode_hash_lock); |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 403 | |
| 404 | if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { |
| 405 | spin_lock(&sbi->dir_hash_lock); |
| 406 | hlist_del_init(&MSDOS_I(inode)->i_dir_hash); |
| 407 | spin_unlock(&sbi->dir_hash_lock); |
| 408 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 410 | EXPORT_SYMBOL_GPL(fat_detach); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | struct inode *fat_iget(struct super_block *sb, loff_t i_pos) |
| 413 | { |
| 414 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
OGAWA Hirofumi | d3dfa82 | 2008-11-06 12:53:49 -0800 | [diff] [blame] | 415 | struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | struct msdos_inode_info *i; |
| 417 | struct inode *inode = NULL; |
| 418 | |
| 419 | spin_lock(&sbi->inode_hash_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 420 | hlist_for_each_entry(i, head, i_fat_hash) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | BUG_ON(i->vfs_inode.i_sb != sb); |
| 422 | if (i->i_pos != i_pos) |
| 423 | continue; |
| 424 | inode = igrab(&i->vfs_inode); |
| 425 | if (inode) |
| 426 | break; |
| 427 | } |
| 428 | spin_unlock(&sbi->inode_hash_lock); |
| 429 | return inode; |
| 430 | } |
| 431 | |
| 432 | static int is_exec(unsigned char *extension) |
| 433 | { |
Manuel Schölling | ef19470 | 2014-06-06 14:36:38 -0700 | [diff] [blame] | 434 | unsigned char exe_extensions[] = "EXECOMBAT", *walk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | for (walk = exe_extensions; *walk; walk += 3) |
| 437 | if (!strncmp(extension, walk, 3)) |
| 438 | return 1; |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | static int fat_calc_dir_size(struct inode *inode) |
| 443 | { |
| 444 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 445 | int ret, fclus, dclus; |
| 446 | |
| 447 | inode->i_size = 0; |
| 448 | if (MSDOS_I(inode)->i_start == 0) |
| 449 | return 0; |
| 450 | |
| 451 | ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); |
| 452 | if (ret < 0) |
| 453 | return ret; |
| 454 | inode->i_size = (fclus + 1) << sbi->cluster_bits; |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | /* doesn't deal with root inode */ |
Namjae Jeon | f1e6fb0 | 2013-04-29 16:21:14 -0700 | [diff] [blame] | 460 | int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
| 462 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| 463 | int error; |
| 464 | |
| 465 | MSDOS_I(inode)->i_pos = 0; |
| 466 | inode->i_uid = sbi->options.fs_uid; |
| 467 | inode->i_gid = sbi->options.fs_gid; |
| 468 | inode->i_version++; |
| 469 | inode->i_generation = get_seconds(); |
| 470 | |
| 471 | if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { |
| 472 | inode->i_generation &= ~1; |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 473 | inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | inode->i_op = sbi->dir_ops; |
| 475 | inode->i_fop = &fat_dir_operations; |
| 476 | |
Steven J. Magnani | a943ed7 | 2012-07-30 14:42:13 -0700 | [diff] [blame] | 477 | MSDOS_I(inode)->i_start = fat_get_start(sbi, de); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
| 479 | error = fat_calc_dir_size(inode); |
| 480 | if (error < 0) |
| 481 | return error; |
| 482 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 483 | |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 484 | set_nlink(inode, fat_subdirs(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } else { /* not a directory */ |
| 486 | inode->i_generation |= 1; |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 487 | inode->i_mode = fat_make_mode(sbi, de->attr, |
| 488 | ((sbi->options.showexec && !is_exec(de->name + 8)) |
| 489 | ? S_IRUGO|S_IWUGO : S_IRWXUGO)); |
Steven J. Magnani | a943ed7 | 2012-07-30 14:42:13 -0700 | [diff] [blame] | 490 | MSDOS_I(inode)->i_start = fat_get_start(sbi, de); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; |
| 493 | inode->i_size = le32_to_cpu(de->size); |
| 494 | inode->i_op = &fat_file_inode_operations; |
| 495 | inode->i_fop = &fat_file_operations; |
| 496 | inode->i_mapping->a_ops = &fat_aops; |
| 497 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 498 | } |
| 499 | if (de->attr & ATTR_SYS) { |
| 500 | if (sbi->options.sys_immutable) |
| 501 | inode->i_flags |= S_IMMUTABLE; |
| 502 | } |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 503 | fat_save_attrs(inode, de->attr); |
| 504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
| 506 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 507 | |
| 508 | fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | if (sbi->options.isvfat) { |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 510 | fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, |
| 511 | de->cdate, de->ctime_cs); |
| 512 | fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } else |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 514 | inode->i_ctime = inode->i_atime = inode->i_mtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | return 0; |
| 517 | } |
| 518 | |
Namjae Jeon | 8fceb4e | 2013-04-29 16:21:12 -0700 | [diff] [blame] | 519 | static inline void fat_lock_build_inode(struct msdos_sb_info *sbi) |
| 520 | { |
| 521 | if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) |
| 522 | mutex_lock(&sbi->nfs_build_inode_lock); |
| 523 | } |
| 524 | |
| 525 | static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi) |
| 526 | { |
| 527 | if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) |
| 528 | mutex_unlock(&sbi->nfs_build_inode_lock); |
| 529 | } |
| 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | struct inode *fat_build_inode(struct super_block *sb, |
| 532 | struct msdos_dir_entry *de, loff_t i_pos) |
| 533 | { |
| 534 | struct inode *inode; |
| 535 | int err; |
| 536 | |
Namjae Jeon | 8fceb4e | 2013-04-29 16:21:12 -0700 | [diff] [blame] | 537 | fat_lock_build_inode(MSDOS_SB(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | inode = fat_iget(sb, i_pos); |
| 539 | if (inode) |
| 540 | goto out; |
| 541 | inode = new_inode(sb); |
| 542 | if (!inode) { |
| 543 | inode = ERR_PTR(-ENOMEM); |
| 544 | goto out; |
| 545 | } |
| 546 | inode->i_ino = iunique(sb, MSDOS_ROOT_INO); |
| 547 | inode->i_version = 1; |
| 548 | err = fat_fill_inode(inode, de); |
| 549 | if (err) { |
| 550 | iput(inode); |
| 551 | inode = ERR_PTR(err); |
| 552 | goto out; |
| 553 | } |
| 554 | fat_attach(inode, i_pos); |
| 555 | insert_inode_hash(inode); |
| 556 | out: |
Namjae Jeon | 8fceb4e | 2013-04-29 16:21:12 -0700 | [diff] [blame] | 557 | fat_unlock_build_inode(MSDOS_SB(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | return inode; |
| 559 | } |
| 560 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 561 | EXPORT_SYMBOL_GPL(fat_build_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 563 | static void fat_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
Johannes Weiner | 91b0abe | 2014-04-03 14:47:49 -0700 | [diff] [blame] | 565 | truncate_inode_pages_final(&inode->i_data); |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 566 | if (!inode->i_nlink) { |
| 567 | inode->i_size = 0; |
| 568 | fat_truncate_blocks(inode, 0); |
| 569 | } |
| 570 | invalidate_inode_buffers(inode); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 571 | clear_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | fat_cache_inval_inode(inode); |
OGAWA Hirofumi | a993b54 | 2008-11-06 12:53:50 -0800 | [diff] [blame] | 573 | fat_detach(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 576 | static void fat_set_state(struct super_block *sb, |
| 577 | unsigned int set, unsigned int force) |
| 578 | { |
| 579 | struct buffer_head *bh; |
| 580 | struct fat_boot_sector *b; |
Fred Chou | d6bd428 | 2015-02-17 13:45:36 -0800 | [diff] [blame] | 581 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 582 | |
| 583 | /* do not change any thing if mounted read only */ |
| 584 | if ((sb->s_flags & MS_RDONLY) && !force) |
| 585 | return; |
| 586 | |
| 587 | /* do not change state if fs was dirty */ |
| 588 | if (sbi->dirty) { |
| 589 | /* warn only on set (mount). */ |
| 590 | if (set) |
| 591 | fat_msg(sb, KERN_WARNING, "Volume was not properly " |
| 592 | "unmounted. Some data may be corrupt. " |
| 593 | "Please run fsck."); |
| 594 | return; |
| 595 | } |
| 596 | |
| 597 | bh = sb_bread(sb, 0); |
| 598 | if (bh == NULL) { |
| 599 | fat_msg(sb, KERN_ERR, "unable to read boot sector " |
| 600 | "to mark fs as dirty"); |
| 601 | return; |
| 602 | } |
| 603 | |
| 604 | b = (struct fat_boot_sector *) bh->b_data; |
| 605 | |
| 606 | if (sbi->fat_bits == 32) { |
| 607 | if (set) |
| 608 | b->fat32.state |= FAT_STATE_DIRTY; |
| 609 | else |
| 610 | b->fat32.state &= ~FAT_STATE_DIRTY; |
| 611 | } else /* fat 16 and 12 */ { |
| 612 | if (set) |
| 613 | b->fat16.state |= FAT_STATE_DIRTY; |
| 614 | else |
| 615 | b->fat16.state &= ~FAT_STATE_DIRTY; |
| 616 | } |
| 617 | |
| 618 | mark_buffer_dirty(bh); |
| 619 | sync_dirty_buffer(bh); |
| 620 | brelse(bh); |
| 621 | } |
| 622 | |
Al Viro | cac45b0 | 2013-10-03 13:16:50 -0400 | [diff] [blame] | 623 | static void delayed_free(struct rcu_head *p) |
| 624 | { |
| 625 | struct msdos_sb_info *sbi = container_of(p, struct msdos_sb_info, rcu); |
| 626 | unload_nls(sbi->nls_disk); |
| 627 | unload_nls(sbi->nls_io); |
| 628 | if (sbi->options.iocharset != fat_default_iocharset) |
| 629 | kfree(sbi->options.iocharset); |
| 630 | kfree(sbi); |
| 631 | } |
| 632 | |
OGAWA Hirofumi | a6bf6b2 | 2006-01-08 01:02:08 -0800 | [diff] [blame] | 633 | static void fat_put_super(struct super_block *sb) |
| 634 | { |
| 635 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 637 | fat_set_state(sb, 0, 0); |
| 638 | |
Artem Bityutskiy | 020ac5b | 2012-05-31 16:26:12 -0700 | [diff] [blame] | 639 | iput(sbi->fsinfo_inode); |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 640 | iput(sbi->fat_inode); |
| 641 | |
Al Viro | cac45b0 | 2013-10-03 13:16:50 -0400 | [diff] [blame] | 642 | call_rcu(&sbi->rcu, delayed_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
| 644 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 645 | static struct kmem_cache *fat_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
| 647 | static struct inode *fat_alloc_inode(struct super_block *sb) |
| 648 | { |
| 649 | struct msdos_inode_info *ei; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 650 | ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | if (!ei) |
| 652 | return NULL; |
Christoph Hellwig | 5826869 | 2011-06-24 14:29:40 -0400 | [diff] [blame] | 653 | |
| 654 | init_rwsem(&ei->truncate_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | return &ei->vfs_inode; |
| 656 | } |
| 657 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 658 | static void fat_i_callback(struct rcu_head *head) |
| 659 | { |
| 660 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 661 | kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); |
| 662 | } |
| 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | static void fat_destroy_inode(struct inode *inode) |
| 665 | { |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 666 | call_rcu(&inode->i_rcu, fat_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | } |
| 668 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 669 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | { |
| 671 | struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; |
| 672 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 673 | spin_lock_init(&ei->cache_lru_lock); |
| 674 | ei->nr_caches = 0; |
| 675 | ei->cache_valid_id = FAT_CACHE_VALID + 1; |
| 676 | INIT_LIST_HEAD(&ei->cache_lru); |
| 677 | INIT_HLIST_NODE(&ei->i_fat_hash); |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 678 | INIT_HLIST_NODE(&ei->i_dir_hash); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 679 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | static int __init fat_init_inodecache(void) |
| 683 | { |
| 684 | fat_inode_cachep = kmem_cache_create("fat_inode_cache", |
| 685 | sizeof(struct msdos_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 686 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 687 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 688 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | if (fat_inode_cachep == NULL) |
| 690 | return -ENOMEM; |
| 691 | return 0; |
| 692 | } |
| 693 | |
| 694 | static void __exit fat_destroy_inodecache(void) |
| 695 | { |
Kirill A. Shutemov | 8c0a853 | 2012-09-26 11:33:07 +1000 | [diff] [blame] | 696 | /* |
| 697 | * Make sure all delayed rcu free inodes are flushed before we |
| 698 | * destroy cache. |
| 699 | */ |
| 700 | rcu_barrier(); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 701 | kmem_cache_destroy(fat_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | } |
| 703 | |
| 704 | static int fat_remount(struct super_block *sb, int *flags, char *data) |
| 705 | { |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 706 | int new_rdonly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 708 | *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 709 | |
Theodore Ts'o | 02b9984 | 2014-03-13 10:14:33 -0400 | [diff] [blame] | 710 | sync_filesystem(sb); |
| 711 | |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 712 | /* make sure we update state on remount. */ |
| 713 | new_rdonly = *flags & MS_RDONLY; |
| 714 | if (new_rdonly != (sb->s_flags & MS_RDONLY)) { |
| 715 | if (new_rdonly) |
| 716 | fat_set_state(sb, 0, 0); |
| 717 | else |
| 718 | fat_set_state(sb, 1, 1); |
| 719 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | return 0; |
| 721 | } |
| 722 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 723 | static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
Coly Li | aac49b7 | 2009-04-02 16:59:35 -0700 | [diff] [blame] | 725 | struct super_block *sb = dentry->d_sb; |
| 726 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 727 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | /* If the count of free cluster is still unknown, counts it here. */ |
OGAWA Hirofumi | 606e423 | 2008-04-28 02:16:27 -0700 | [diff] [blame] | 730 | if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 731 | int err = fat_count_free_clusters(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | if (err) |
| 733 | return err; |
| 734 | } |
| 735 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 736 | buf->f_type = dentry->d_sb->s_magic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | buf->f_bsize = sbi->cluster_size; |
| 738 | buf->f_blocks = sbi->max_cluster - FAT_START_ENT; |
| 739 | buf->f_bfree = sbi->free_clusters; |
| 740 | buf->f_bavail = sbi->free_clusters; |
Coly Li | aac49b7 | 2009-04-02 16:59:35 -0700 | [diff] [blame] | 741 | buf->f_fsid.val[0] = (u32)id; |
| 742 | buf->f_fsid.val[1] = (u32)(id >> 32); |
OGAWA Hirofumi | f68e542 | 2011-04-12 21:08:39 +0900 | [diff] [blame] | 743 | buf->f_namelen = |
| 744 | (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | return 0; |
| 747 | } |
| 748 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 749 | static int __fat_write_inode(struct inode *inode, int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | { |
| 751 | struct super_block *sb = inode->i_sb; |
| 752 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 753 | struct buffer_head *bh; |
| 754 | struct msdos_dir_entry *raw_entry; |
| 755 | loff_t i_pos; |
Namjae Jeon | e22a444 | 2013-04-29 16:21:10 -0700 | [diff] [blame] | 756 | sector_t blocknr; |
| 757 | int err, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
OGAWA Hirofumi | 9ca59f4 | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 759 | if (inode->i_ino == MSDOS_ROOT_INO) |
| 760 | return 0; |
| 761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | retry: |
OGAWA Hirofumi | 9ca59f4 | 2008-11-06 12:53:57 -0800 | [diff] [blame] | 763 | i_pos = fat_i_pos_read(sbi, inode); |
| 764 | if (!i_pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | return 0; |
| 766 | |
Namjae Jeon | e22a444 | 2013-04-29 16:21:10 -0700 | [diff] [blame] | 767 | fat_get_blknr_offset(sbi, i_pos, &blocknr, &offset); |
| 768 | bh = sb_bread(sb, blocknr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | if (!bh) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 770 | fat_msg(sb, KERN_ERR, "unable to read inode block " |
| 771 | "for updating (i_pos %lld)", i_pos); |
Linus Torvalds | 5f22ca9 | 2008-08-20 08:31:19 -0700 | [diff] [blame] | 772 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
| 774 | spin_lock(&sbi->inode_hash_lock); |
| 775 | if (i_pos != MSDOS_I(inode)->i_pos) { |
| 776 | spin_unlock(&sbi->inode_hash_lock); |
| 777 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | goto retry; |
| 779 | } |
| 780 | |
Namjae Jeon | e22a444 | 2013-04-29 16:21:10 -0700 | [diff] [blame] | 781 | raw_entry = &((struct msdos_dir_entry *) (bh->b_data))[offset]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | if (S_ISDIR(inode->i_mode)) |
| 783 | raw_entry->size = 0; |
| 784 | else |
| 785 | raw_entry->size = cpu_to_le32(inode->i_size); |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 786 | raw_entry->attr = fat_make_attrs(inode); |
Steven J. Magnani | a943ed7 | 2012-07-30 14:42:13 -0700 | [diff] [blame] | 787 | fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart); |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 788 | fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, |
| 789 | &raw_entry->date, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | if (sbi->options.isvfat) { |
Stephane Kardas | 62a36c4 | 2005-09-21 09:55:45 -0700 | [diff] [blame] | 791 | __le16 atime; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 792 | fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, |
| 793 | &raw_entry->cdate, &raw_entry->ctime_cs); |
| 794 | fat_time_unix2fat(sbi, &inode->i_atime, &atime, |
| 795 | &raw_entry->adate, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
| 797 | spin_unlock(&sbi->inode_hash_lock); |
| 798 | mark_buffer_dirty(bh); |
Linus Torvalds | 5f22ca9 | 2008-08-20 08:31:19 -0700 | [diff] [blame] | 799 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | if (wait) |
| 801 | err = sync_dirty_buffer(bh); |
| 802 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | return err; |
| 804 | } |
| 805 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 806 | static int fat_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 807 | { |
Artem Bityutskiy | 7849118 | 2012-05-31 16:26:13 -0700 | [diff] [blame] | 808 | int err; |
| 809 | |
| 810 | if (inode->i_ino == MSDOS_FSINFO_INO) { |
| 811 | struct super_block *sb = inode->i_sb; |
| 812 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 813 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
Artem Bityutskiy | 7849118 | 2012-05-31 16:26:13 -0700 | [diff] [blame] | 814 | err = fat_clusters_flush(sb); |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 815 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Artem Bityutskiy | 7849118 | 2012-05-31 16:26:13 -0700 | [diff] [blame] | 816 | } else |
| 817 | err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
| 818 | |
| 819 | return err; |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 820 | } |
| 821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | int fat_sync_inode(struct inode *inode) |
| 823 | { |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 824 | return __fat_write_inode(inode, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
| 826 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 827 | EXPORT_SYMBOL_GPL(fat_sync_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 829 | static int fat_show_options(struct seq_file *m, struct dentry *root); |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 830 | static const struct super_operations fat_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | .alloc_inode = fat_alloc_inode, |
| 832 | .destroy_inode = fat_destroy_inode, |
| 833 | .write_inode = fat_write_inode, |
Al Viro | deee3ce | 2010-06-05 19:28:32 -0400 | [diff] [blame] | 834 | .evict_inode = fat_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | .put_super = fat_put_super, |
| 836 | .statfs = fat_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | .remount_fs = fat_remount, |
| 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | .show_options = fat_show_options, |
| 840 | }; |
| 841 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 842 | static int fat_show_options(struct seq_file *m, struct dentry *root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 844 | struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | struct fat_mount_options *opts = &sbi->options; |
| 846 | int isvfat = opts->isvfat; |
| 847 | |
Eric W. Biederman | 170782e | 2012-02-07 16:25:39 -0800 | [diff] [blame] | 848 | if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) |
| 849 | seq_printf(m, ",uid=%u", |
| 850 | from_kuid_munged(&init_user_ns, opts->fs_uid)); |
| 851 | if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) |
| 852 | seq_printf(m, ",gid=%u", |
| 853 | from_kgid_munged(&init_user_ns, opts->fs_gid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | seq_printf(m, ",fmask=%04o", opts->fs_fmask); |
| 855 | seq_printf(m, ",dmask=%04o", opts->fs_dmask); |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 856 | if (opts->allow_utime) |
| 857 | seq_printf(m, ",allow_utime=%04o", opts->allow_utime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | if (sbi->nls_disk) |
Dave Reisner | c6c2037 | 2012-12-17 16:03:01 -0800 | [diff] [blame] | 859 | /* strip "cp" prefix from displayed option */ |
| 860 | seq_printf(m, ",codepage=%s", &sbi->nls_disk->charset[2]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | if (isvfat) { |
| 862 | if (sbi->nls_io) |
| 863 | seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); |
| 864 | |
| 865 | switch (opts->shortname) { |
| 866 | case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: |
| 867 | seq_puts(m, ",shortname=win95"); |
| 868 | break; |
| 869 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: |
| 870 | seq_puts(m, ",shortname=winnt"); |
| 871 | break; |
| 872 | case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: |
| 873 | seq_puts(m, ",shortname=mixed"); |
| 874 | break; |
| 875 | case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: |
Paul Wise | 9552347 | 2009-08-01 21:30:31 +0900 | [diff] [blame] | 876 | seq_puts(m, ",shortname=lower"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | break; |
| 878 | default: |
| 879 | seq_puts(m, ",shortname=unknown"); |
| 880 | break; |
| 881 | } |
| 882 | } |
| 883 | if (opts->name_check != 'n') |
| 884 | seq_printf(m, ",check=%c", opts->name_check); |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 885 | if (opts->usefree) |
| 886 | seq_puts(m, ",usefree"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | if (opts->quiet) |
| 888 | seq_puts(m, ",quiet"); |
| 889 | if (opts->showexec) |
| 890 | seq_puts(m, ",showexec"); |
| 891 | if (opts->sys_immutable) |
| 892 | seq_puts(m, ",sys_immutable"); |
| 893 | if (!isvfat) { |
| 894 | if (opts->dotsOK) |
| 895 | seq_puts(m, ",dotsOK=yes"); |
| 896 | if (opts->nocase) |
| 897 | seq_puts(m, ",nocase"); |
| 898 | } else { |
| 899 | if (opts->utf8) |
| 900 | seq_puts(m, ",utf8"); |
| 901 | if (opts->unicode_xlate) |
| 902 | seq_puts(m, ",uni_xlate"); |
| 903 | if (!opts->numtail) |
| 904 | seq_puts(m, ",nonumtail"); |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 905 | if (opts->rodir) |
| 906 | seq_puts(m, ",rodir"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 908 | if (opts->flush) |
Miklos Szeredi | c1fca3b | 2008-02-08 04:21:42 -0800 | [diff] [blame] | 909 | seq_puts(m, ",flush"); |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 910 | if (opts->tz_set) { |
| 911 | if (opts->time_offset) |
| 912 | seq_printf(m, ",time_offset=%d", opts->time_offset); |
| 913 | else |
| 914 | seq_puts(m, ",tz=UTC"); |
| 915 | } |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 916 | if (opts->errors == FAT_ERRORS_CONT) |
| 917 | seq_puts(m, ",errors=continue"); |
| 918 | else if (opts->errors == FAT_ERRORS_PANIC) |
| 919 | seq_puts(m, ",errors=panic"); |
| 920 | else |
| 921 | seq_puts(m, ",errors=remount-ro"); |
Namjae Jeon | 2628b7a | 2013-04-29 16:21:08 -0700 | [diff] [blame] | 922 | if (opts->nfs == FAT_NFS_NOSTALE_RO) |
| 923 | seq_puts(m, ",nfs=nostale_ro"); |
| 924 | else if (opts->nfs) |
| 925 | seq_puts(m, ",nfs=stale_rw"); |
Christoph Hellwig | 681142f | 2009-11-21 20:28:52 +0900 | [diff] [blame] | 926 | if (opts->discard) |
| 927 | seq_puts(m, ",discard"); |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 928 | if (opts->dos1xfloppy) |
| 929 | seq_puts(m, ",dos1xfloppy"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | enum { |
| 935 | 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] | 936 | Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, |
| 937 | Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, |
| 938 | Opt_immutable, Opt_dots, Opt_nodots, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
| 940 | Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, |
| 941 | Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, |
Geert Uytterhoeven | d7a83c0 | 2011-10-31 20:50:45 +0100 | [diff] [blame] | 942 | Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 943 | Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset, |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 944 | Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err, Opt_dos1xfloppy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | }; |
| 946 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 947 | static const match_table_t fat_tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | {Opt_check_r, "check=relaxed"}, |
| 949 | {Opt_check_s, "check=strict"}, |
| 950 | {Opt_check_n, "check=normal"}, |
| 951 | {Opt_check_r, "check=r"}, |
| 952 | {Opt_check_s, "check=s"}, |
| 953 | {Opt_check_n, "check=n"}, |
| 954 | {Opt_uid, "uid=%u"}, |
| 955 | {Opt_gid, "gid=%u"}, |
| 956 | {Opt_umask, "umask=%o"}, |
| 957 | {Opt_dmask, "dmask=%o"}, |
| 958 | {Opt_fmask, "fmask=%o"}, |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 959 | {Opt_allow_utime, "allow_utime=%o"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | {Opt_codepage, "codepage=%u"}, |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 961 | {Opt_usefree, "usefree"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | {Opt_nocase, "nocase"}, |
| 963 | {Opt_quiet, "quiet"}, |
| 964 | {Opt_showexec, "showexec"}, |
| 965 | {Opt_debug, "debug"}, |
| 966 | {Opt_immutable, "sys_immutable"}, |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 967 | {Opt_flush, "flush"}, |
| 968 | {Opt_tz_utc, "tz=UTC"}, |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 969 | {Opt_time_offset, "time_offset=%d"}, |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 970 | {Opt_err_cont, "errors=continue"}, |
| 971 | {Opt_err_panic, "errors=panic"}, |
| 972 | {Opt_err_ro, "errors=remount-ro"}, |
Christoph Hellwig | 681142f | 2009-11-21 20:28:52 +0900 | [diff] [blame] | 973 | {Opt_discard, "discard"}, |
Namjae Jeon | 2628b7a | 2013-04-29 16:21:08 -0700 | [diff] [blame] | 974 | {Opt_nfs_stale_rw, "nfs"}, |
| 975 | {Opt_nfs_stale_rw, "nfs=stale_rw"}, |
| 976 | {Opt_nfs_nostale_ro, "nfs=nostale_ro"}, |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 977 | {Opt_dos1xfloppy, "dos1xfloppy"}, |
Geert Uytterhoeven | d7a83c0 | 2011-10-31 20:50:45 +0100 | [diff] [blame] | 978 | {Opt_obsolete, "conv=binary"}, |
| 979 | {Opt_obsolete, "conv=text"}, |
| 980 | {Opt_obsolete, "conv=auto"}, |
| 981 | {Opt_obsolete, "conv=b"}, |
| 982 | {Opt_obsolete, "conv=t"}, |
| 983 | {Opt_obsolete, "conv=a"}, |
| 984 | {Opt_obsolete, "fat=%u"}, |
| 985 | {Opt_obsolete, "blocksize=%u"}, |
| 986 | {Opt_obsolete, "cvf_format=%20s"}, |
| 987 | {Opt_obsolete, "cvf_options=%100s"}, |
| 988 | {Opt_obsolete, "posix"}, |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 989 | {Opt_err, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | }; |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 991 | static const match_table_t msdos_tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | {Opt_nodots, "nodots"}, |
| 993 | {Opt_nodots, "dotsOK=no"}, |
| 994 | {Opt_dots, "dots"}, |
| 995 | {Opt_dots, "dotsOK=yes"}, |
| 996 | {Opt_err, NULL} |
| 997 | }; |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 998 | static const match_table_t vfat_tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | {Opt_charset, "iocharset=%s"}, |
| 1000 | {Opt_shortname_lower, "shortname=lower"}, |
| 1001 | {Opt_shortname_win95, "shortname=win95"}, |
| 1002 | {Opt_shortname_winnt, "shortname=winnt"}, |
| 1003 | {Opt_shortname_mixed, "shortname=mixed"}, |
| 1004 | {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ |
| 1005 | {Opt_utf8_no, "utf8=no"}, |
| 1006 | {Opt_utf8_no, "utf8=false"}, |
| 1007 | {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ |
| 1008 | {Opt_utf8_yes, "utf8=yes"}, |
| 1009 | {Opt_utf8_yes, "utf8=true"}, |
| 1010 | {Opt_utf8_yes, "utf8"}, |
| 1011 | {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ |
| 1012 | {Opt_uni_xl_no, "uni_xlate=no"}, |
| 1013 | {Opt_uni_xl_no, "uni_xlate=false"}, |
| 1014 | {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ |
| 1015 | {Opt_uni_xl_yes, "uni_xlate=yes"}, |
| 1016 | {Opt_uni_xl_yes, "uni_xlate=true"}, |
| 1017 | {Opt_uni_xl_yes, "uni_xlate"}, |
| 1018 | {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ |
| 1019 | {Opt_nonumtail_no, "nonumtail=no"}, |
| 1020 | {Opt_nonumtail_no, "nonumtail=false"}, |
| 1021 | {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ |
| 1022 | {Opt_nonumtail_yes, "nonumtail=yes"}, |
| 1023 | {Opt_nonumtail_yes, "nonumtail=true"}, |
| 1024 | {Opt_nonumtail_yes, "nonumtail"}, |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 1025 | {Opt_rodir, "rodir"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | {Opt_err, NULL} |
| 1027 | }; |
| 1028 | |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1029 | static int parse_options(struct super_block *sb, char *options, int is_vfat, |
| 1030 | int silent, int *debug, struct fat_mount_options *opts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | { |
| 1032 | char *p; |
| 1033 | substring_t args[MAX_OPT_ARGS]; |
| 1034 | int option; |
| 1035 | char *iocharset; |
| 1036 | |
| 1037 | opts->isvfat = is_vfat; |
| 1038 | |
David Howells | f0ce7ee | 2008-11-14 10:38:52 +1100 | [diff] [blame] | 1039 | opts->fs_uid = current_uid(); |
| 1040 | opts->fs_gid = current_gid(); |
OGAWA Hirofumi | 3e10760 | 2009-06-20 21:50:07 +0900 | [diff] [blame] | 1041 | opts->fs_fmask = opts->fs_dmask = current_umask(); |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 1042 | opts->allow_utime = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | opts->codepage = fat_default_codepage; |
| 1044 | opts->iocharset = fat_default_iocharset; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 1045 | if (is_vfat) { |
Paul Wise | 9552347 | 2009-08-01 21:30:31 +0900 | [diff] [blame] | 1046 | opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 1047 | opts->rodir = 0; |
| 1048 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | opts->shortname = 0; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 1050 | opts->rodir = 1; |
| 1051 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | opts->name_check = 'n'; |
| 1053 | opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; |
| 1054 | opts->utf8 = opts->unicode_xlate = 0; |
| 1055 | opts->numtail = 1; |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 1056 | opts->usefree = opts->nocase = 0; |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 1057 | opts->tz_set = 0; |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 1058 | opts->nfs = 0; |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 1059 | opts->errors = FAT_ERRORS_RO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | *debug = 0; |
| 1061 | |
| 1062 | if (!options) |
OGAWA Hirofumi | 8d44d97 | 2008-07-25 01:46:41 -0700 | [diff] [blame] | 1063 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
| 1065 | while ((p = strsep(&options, ",")) != NULL) { |
| 1066 | int token; |
| 1067 | if (!*p) |
| 1068 | continue; |
| 1069 | |
| 1070 | token = match_token(p, fat_tokens, args); |
| 1071 | if (token == Opt_err) { |
| 1072 | if (is_vfat) |
| 1073 | token = match_token(p, vfat_tokens, args); |
| 1074 | else |
| 1075 | token = match_token(p, msdos_tokens, args); |
| 1076 | } |
| 1077 | switch (token) { |
| 1078 | case Opt_check_s: |
| 1079 | opts->name_check = 's'; |
| 1080 | break; |
| 1081 | case Opt_check_r: |
| 1082 | opts->name_check = 'r'; |
| 1083 | break; |
| 1084 | case Opt_check_n: |
| 1085 | opts->name_check = 'n'; |
| 1086 | break; |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 1087 | case Opt_usefree: |
| 1088 | opts->usefree = 1; |
| 1089 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | case Opt_nocase: |
| 1091 | if (!is_vfat) |
| 1092 | opts->nocase = 1; |
| 1093 | else { |
| 1094 | /* for backward compatibility */ |
| 1095 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 |
| 1096 | | VFAT_SFN_CREATE_WIN95; |
| 1097 | } |
| 1098 | break; |
| 1099 | case Opt_quiet: |
| 1100 | opts->quiet = 1; |
| 1101 | break; |
| 1102 | case Opt_showexec: |
| 1103 | opts->showexec = 1; |
| 1104 | break; |
| 1105 | case Opt_debug: |
| 1106 | *debug = 1; |
| 1107 | break; |
| 1108 | case Opt_immutable: |
| 1109 | opts->sys_immutable = 1; |
| 1110 | break; |
| 1111 | case Opt_uid: |
| 1112 | if (match_int(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1113 | return -EINVAL; |
Eric W. Biederman | 170782e | 2012-02-07 16:25:39 -0800 | [diff] [blame] | 1114 | opts->fs_uid = make_kuid(current_user_ns(), option); |
| 1115 | if (!uid_valid(opts->fs_uid)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1116 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | break; |
| 1118 | case Opt_gid: |
| 1119 | if (match_int(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1120 | return -EINVAL; |
Eric W. Biederman | 170782e | 2012-02-07 16:25:39 -0800 | [diff] [blame] | 1121 | opts->fs_gid = make_kgid(current_user_ns(), option); |
| 1122 | if (!gid_valid(opts->fs_gid)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1123 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | break; |
| 1125 | case Opt_umask: |
| 1126 | if (match_octal(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1127 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | opts->fs_fmask = opts->fs_dmask = option; |
| 1129 | break; |
| 1130 | case Opt_dmask: |
| 1131 | if (match_octal(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1132 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | opts->fs_dmask = option; |
| 1134 | break; |
| 1135 | case Opt_fmask: |
| 1136 | if (match_octal(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1137 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | opts->fs_fmask = option; |
| 1139 | break; |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 1140 | case Opt_allow_utime: |
| 1141 | if (match_octal(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1142 | return -EINVAL; |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 1143 | opts->allow_utime = option & (S_IWGRP | S_IWOTH); |
| 1144 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | case Opt_codepage: |
| 1146 | if (match_int(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1147 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | opts->codepage = option; |
| 1149 | break; |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1150 | case Opt_flush: |
| 1151 | opts->flush = 1; |
| 1152 | break; |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 1153 | case Opt_time_offset: |
| 1154 | if (match_int(&args[0], &option)) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1155 | return -EINVAL; |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 1156 | if (option < -12 * 60 || option > 12 * 60) |
Jan Kara | 5b3d5ae | 2012-12-17 16:02:59 -0800 | [diff] [blame] | 1157 | return -EINVAL; |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 1158 | opts->tz_set = 1; |
| 1159 | opts->time_offset = option; |
| 1160 | break; |
Joe Peterson | b271e06 | 2008-07-25 01:46:47 -0700 | [diff] [blame] | 1161 | case Opt_tz_utc: |
Jan Kara | 58156c8 | 2012-12-17 16:02:58 -0800 | [diff] [blame] | 1162 | opts->tz_set = 1; |
| 1163 | opts->time_offset = 0; |
Joe Peterson | b271e06 | 2008-07-25 01:46:47 -0700 | [diff] [blame] | 1164 | break; |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 1165 | case Opt_err_cont: |
| 1166 | opts->errors = FAT_ERRORS_CONT; |
| 1167 | break; |
| 1168 | case Opt_err_panic: |
| 1169 | opts->errors = FAT_ERRORS_PANIC; |
| 1170 | break; |
| 1171 | case Opt_err_ro: |
| 1172 | opts->errors = FAT_ERRORS_RO; |
| 1173 | break; |
Namjae Jeon | 2628b7a | 2013-04-29 16:21:08 -0700 | [diff] [blame] | 1174 | case Opt_nfs_stale_rw: |
| 1175 | opts->nfs = FAT_NFS_STALE_RW; |
| 1176 | break; |
| 1177 | case Opt_nfs_nostale_ro: |
| 1178 | opts->nfs = FAT_NFS_NOSTALE_RO; |
| 1179 | break; |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1180 | case Opt_dos1xfloppy: |
| 1181 | opts->dos1xfloppy = 1; |
| 1182 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
| 1184 | /* msdos specific */ |
| 1185 | case Opt_dots: |
| 1186 | opts->dotsOK = 1; |
| 1187 | break; |
| 1188 | case Opt_nodots: |
| 1189 | opts->dotsOK = 0; |
| 1190 | break; |
| 1191 | |
| 1192 | /* vfat specific */ |
| 1193 | case Opt_charset: |
| 1194 | if (opts->iocharset != fat_default_iocharset) |
| 1195 | kfree(opts->iocharset); |
| 1196 | iocharset = match_strdup(&args[0]); |
| 1197 | if (!iocharset) |
| 1198 | return -ENOMEM; |
| 1199 | opts->iocharset = iocharset; |
| 1200 | break; |
| 1201 | case Opt_shortname_lower: |
| 1202 | opts->shortname = VFAT_SFN_DISPLAY_LOWER |
| 1203 | | VFAT_SFN_CREATE_WIN95; |
| 1204 | break; |
| 1205 | case Opt_shortname_win95: |
| 1206 | opts->shortname = VFAT_SFN_DISPLAY_WIN95 |
| 1207 | | VFAT_SFN_CREATE_WIN95; |
| 1208 | break; |
| 1209 | case Opt_shortname_winnt: |
| 1210 | opts->shortname = VFAT_SFN_DISPLAY_WINNT |
| 1211 | | VFAT_SFN_CREATE_WINNT; |
| 1212 | break; |
| 1213 | case Opt_shortname_mixed: |
| 1214 | opts->shortname = VFAT_SFN_DISPLAY_WINNT |
| 1215 | | VFAT_SFN_CREATE_WIN95; |
| 1216 | break; |
| 1217 | case Opt_utf8_no: /* 0 or no or false */ |
| 1218 | opts->utf8 = 0; |
| 1219 | break; |
| 1220 | case Opt_utf8_yes: /* empty or 1 or yes or true */ |
| 1221 | opts->utf8 = 1; |
| 1222 | break; |
| 1223 | case Opt_uni_xl_no: /* 0 or no or false */ |
| 1224 | opts->unicode_xlate = 0; |
| 1225 | break; |
| 1226 | case Opt_uni_xl_yes: /* empty or 1 or yes or true */ |
| 1227 | opts->unicode_xlate = 1; |
| 1228 | break; |
| 1229 | case Opt_nonumtail_no: /* 0 or no or false */ |
| 1230 | opts->numtail = 1; /* negated option */ |
| 1231 | break; |
| 1232 | case Opt_nonumtail_yes: /* empty or 1 or yes or true */ |
| 1233 | opts->numtail = 0; /* negated option */ |
| 1234 | break; |
OGAWA Hirofumi | dfc209c | 2008-11-06 12:53:55 -0800 | [diff] [blame] | 1235 | case Opt_rodir: |
| 1236 | opts->rodir = 1; |
| 1237 | break; |
Christoph Hellwig | 681142f | 2009-11-21 20:28:52 +0900 | [diff] [blame] | 1238 | case Opt_discard: |
| 1239 | opts->discard = 1; |
| 1240 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
| 1242 | /* obsolete mount options */ |
Geert Uytterhoeven | d7a83c0 | 2011-10-31 20:50:45 +0100 | [diff] [blame] | 1243 | case Opt_obsolete: |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1244 | fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, " |
| 1245 | "not supported now", p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | break; |
| 1247 | /* unknown option */ |
| 1248 | default: |
Christoph Hellwig | 41a34a4 | 2005-11-08 21:34:57 -0800 | [diff] [blame] | 1249 | if (!silent) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1250 | fat_msg(sb, KERN_ERR, |
| 1251 | "Unrecognized mount option \"%s\" " |
| 1252 | "or missing value", p); |
Christoph Hellwig | 41a34a4 | 2005-11-08 21:34:57 -0800 | [diff] [blame] | 1253 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | return -EINVAL; |
| 1255 | } |
| 1256 | } |
OGAWA Hirofumi | 8d44d97 | 2008-07-25 01:46:41 -0700 | [diff] [blame] | 1257 | |
| 1258 | out: |
Alexey Dobriyan | 4de151d | 2006-03-22 00:13:35 +0100 | [diff] [blame] | 1259 | /* UTF-8 doesn't provide FAT semantics */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | if (!strcmp(opts->iocharset, "utf8")) { |
Mihai Moldovan | 186b537 | 2011-08-17 19:10:08 +0900 | [diff] [blame] | 1261 | fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset" |
OGAWA Hirofumi | 8d44d97 | 2008-07-25 01:46:41 -0700 | [diff] [blame] | 1262 | " for FAT filesystems, filesystem will be " |
Mihai Moldovan | 186b537 | 2011-08-17 19:10:08 +0900 | [diff] [blame] | 1263 | "case sensitive!"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | } |
| 1265 | |
OGAWA Hirofumi | 1ae43f8 | 2008-04-28 02:16:26 -0700 | [diff] [blame] | 1266 | /* If user doesn't specify allow_utime, it's initialized from dmask. */ |
| 1267 | if (opts->allow_utime == (unsigned short)-1) |
| 1268 | opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | if (opts->unicode_xlate) |
| 1270 | opts->utf8 = 0; |
Namjae Jeon | ea3983a | 2013-04-29 16:21:11 -0700 | [diff] [blame] | 1271 | if (opts->nfs == FAT_NFS_NOSTALE_RO) { |
Namjae Jeon | 2628b7a | 2013-04-29 16:21:08 -0700 | [diff] [blame] | 1272 | sb->s_flags |= MS_RDONLY; |
Namjae Jeon | ea3983a | 2013-04-29 16:21:11 -0700 | [diff] [blame] | 1273 | sb->s_export_op = &fat_export_ops_nostale; |
| 1274 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | |
| 1276 | return 0; |
| 1277 | } |
| 1278 | |
| 1279 | static int fat_read_root(struct inode *inode) |
| 1280 | { |
| 1281 | struct super_block *sb = inode->i_sb; |
| 1282 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 1283 | int error; |
| 1284 | |
Namjae Jeon | ea3983a | 2013-04-29 16:21:11 -0700 | [diff] [blame] | 1285 | MSDOS_I(inode)->i_pos = MSDOS_ROOT_INO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | inode->i_uid = sbi->options.fs_uid; |
| 1287 | inode->i_gid = sbi->options.fs_gid; |
| 1288 | inode->i_version++; |
| 1289 | inode->i_generation = 0; |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 1290 | inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | inode->i_op = sbi->dir_ops; |
| 1292 | inode->i_fop = &fat_dir_operations; |
| 1293 | if (sbi->fat_bits == 32) { |
| 1294 | MSDOS_I(inode)->i_start = sbi->root_cluster; |
| 1295 | error = fat_calc_dir_size(inode); |
| 1296 | if (error < 0) |
| 1297 | return error; |
| 1298 | } else { |
| 1299 | MSDOS_I(inode)->i_start = 0; |
| 1300 | inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); |
| 1301 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) |
| 1303 | & ~((loff_t)sbi->cluster_size - 1)) >> 9; |
| 1304 | MSDOS_I(inode)->i_logstart = 0; |
| 1305 | MSDOS_I(inode)->mmu_private = inode->i_size; |
| 1306 | |
OGAWA Hirofumi | 9c0aa1b | 2008-11-06 12:53:54 -0800 | [diff] [blame] | 1307 | fat_save_attrs(inode, ATTR_DIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; |
| 1309 | inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 1310 | set_nlink(inode, fat_subdirs(inode)+2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
| 1312 | return 0; |
| 1313 | } |
| 1314 | |
OGAWA Hirofumi | 7b92d03 | 2013-05-24 15:55:08 -0700 | [diff] [blame] | 1315 | static unsigned long calc_fat_clusters(struct super_block *sb) |
| 1316 | { |
| 1317 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
| 1318 | |
| 1319 | /* Divide first to avoid overflow */ |
| 1320 | if (sbi->fat_bits != 12) { |
| 1321 | unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits; |
| 1322 | return ent_per_sec * sbi->fat_length; |
| 1323 | } |
| 1324 | |
| 1325 | return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; |
| 1326 | } |
| 1327 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1328 | static bool fat_bpb_is_zero(struct fat_boot_sector *b) |
| 1329 | { |
| 1330 | if (get_unaligned_le16(&b->sector_size)) |
| 1331 | return false; |
| 1332 | if (b->sec_per_clus) |
| 1333 | return false; |
| 1334 | if (b->reserved) |
| 1335 | return false; |
| 1336 | if (b->fats) |
| 1337 | return false; |
| 1338 | if (get_unaligned_le16(&b->dir_entries)) |
| 1339 | return false; |
| 1340 | if (get_unaligned_le16(&b->sectors)) |
| 1341 | return false; |
| 1342 | if (b->media) |
| 1343 | return false; |
| 1344 | if (b->fat_length) |
| 1345 | return false; |
| 1346 | if (b->secs_track) |
| 1347 | return false; |
| 1348 | if (b->heads) |
| 1349 | return false; |
| 1350 | return true; |
| 1351 | } |
| 1352 | |
| 1353 | static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b, |
| 1354 | int silent, struct fat_bios_param_block *bpb) |
| 1355 | { |
| 1356 | int error = -EINVAL; |
| 1357 | |
| 1358 | /* Read in BPB ... */ |
| 1359 | memset(bpb, 0, sizeof(*bpb)); |
| 1360 | bpb->fat_sector_size = get_unaligned_le16(&b->sector_size); |
| 1361 | bpb->fat_sec_per_clus = b->sec_per_clus; |
| 1362 | bpb->fat_reserved = le16_to_cpu(b->reserved); |
| 1363 | bpb->fat_fats = b->fats; |
| 1364 | bpb->fat_dir_entries = get_unaligned_le16(&b->dir_entries); |
| 1365 | bpb->fat_sectors = get_unaligned_le16(&b->sectors); |
| 1366 | bpb->fat_fat_length = le16_to_cpu(b->fat_length); |
| 1367 | bpb->fat_total_sect = le32_to_cpu(b->total_sect); |
| 1368 | |
| 1369 | bpb->fat16_state = b->fat16.state; |
| 1370 | bpb->fat16_vol_id = get_unaligned_le32(b->fat16.vol_id); |
| 1371 | |
| 1372 | bpb->fat32_length = le32_to_cpu(b->fat32.length); |
| 1373 | bpb->fat32_root_cluster = le32_to_cpu(b->fat32.root_cluster); |
| 1374 | bpb->fat32_info_sector = le16_to_cpu(b->fat32.info_sector); |
| 1375 | bpb->fat32_state = b->fat32.state; |
| 1376 | bpb->fat32_vol_id = get_unaligned_le32(b->fat32.vol_id); |
| 1377 | |
| 1378 | /* Validate this looks like a FAT filesystem BPB */ |
| 1379 | if (!bpb->fat_reserved) { |
| 1380 | if (!silent) |
| 1381 | fat_msg(sb, KERN_ERR, |
| 1382 | "bogus number of reserved sectors"); |
| 1383 | goto out; |
| 1384 | } |
| 1385 | if (!bpb->fat_fats) { |
| 1386 | if (!silent) |
| 1387 | fat_msg(sb, KERN_ERR, "bogus number of FAT structure"); |
| 1388 | goto out; |
| 1389 | } |
| 1390 | |
| 1391 | /* |
| 1392 | * Earlier we checked here that b->secs_track and b->head are nonzero, |
| 1393 | * but it turns out valid FAT filesystems can have zero there. |
| 1394 | */ |
| 1395 | |
| 1396 | if (!fat_valid_media(b->media)) { |
| 1397 | if (!silent) |
| 1398 | fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)", |
| 1399 | (unsigned)b->media); |
| 1400 | goto out; |
| 1401 | } |
| 1402 | |
| 1403 | if (!is_power_of_2(bpb->fat_sector_size) |
| 1404 | || (bpb->fat_sector_size < 512) |
| 1405 | || (bpb->fat_sector_size > 4096)) { |
| 1406 | if (!silent) |
| 1407 | fat_msg(sb, KERN_ERR, "bogus logical sector size %u", |
| 1408 | (unsigned)bpb->fat_sector_size); |
| 1409 | goto out; |
| 1410 | } |
| 1411 | |
| 1412 | if (!is_power_of_2(bpb->fat_sec_per_clus)) { |
| 1413 | if (!silent) |
| 1414 | fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u", |
| 1415 | (unsigned)bpb->fat_sec_per_clus); |
| 1416 | goto out; |
| 1417 | } |
| 1418 | |
| 1419 | error = 0; |
| 1420 | |
| 1421 | out: |
| 1422 | return error; |
| 1423 | } |
| 1424 | |
| 1425 | static int fat_read_static_bpb(struct super_block *sb, |
| 1426 | struct fat_boot_sector *b, int silent, |
| 1427 | struct fat_bios_param_block *bpb) |
| 1428 | { |
| 1429 | static const char *notdos1x = "This doesn't look like a DOS 1.x volume"; |
| 1430 | |
| 1431 | struct fat_floppy_defaults *fdefaults = NULL; |
| 1432 | int error = -EINVAL; |
| 1433 | sector_t bd_sects; |
| 1434 | unsigned i; |
| 1435 | |
| 1436 | bd_sects = i_size_read(sb->s_bdev->bd_inode) / SECTOR_SIZE; |
| 1437 | |
| 1438 | /* 16-bit DOS 1.x reliably wrote bootstrap short-jmp code */ |
| 1439 | if (b->ignored[0] != 0xeb || b->ignored[2] != 0x90) { |
| 1440 | if (!silent) |
| 1441 | fat_msg(sb, KERN_ERR, |
| 1442 | "%s; no bootstrapping code", notdos1x); |
| 1443 | goto out; |
| 1444 | } |
| 1445 | |
| 1446 | /* |
| 1447 | * If any value in this region is non-zero, it isn't archaic |
| 1448 | * DOS. |
| 1449 | */ |
| 1450 | if (!fat_bpb_is_zero(b)) { |
| 1451 | if (!silent) |
| 1452 | fat_msg(sb, KERN_ERR, |
| 1453 | "%s; DOS 2.x BPB is non-zero", notdos1x); |
| 1454 | goto out; |
| 1455 | } |
| 1456 | |
| 1457 | for (i = 0; i < ARRAY_SIZE(floppy_defaults); i++) { |
| 1458 | if (floppy_defaults[i].nr_sectors == bd_sects) { |
| 1459 | fdefaults = &floppy_defaults[i]; |
| 1460 | break; |
| 1461 | } |
| 1462 | } |
| 1463 | |
| 1464 | if (fdefaults == NULL) { |
| 1465 | if (!silent) |
| 1466 | fat_msg(sb, KERN_WARNING, |
| 1467 | "This looks like a DOS 1.x volume, but isn't a recognized floppy size (%llu sectors)", |
| 1468 | (u64)bd_sects); |
| 1469 | goto out; |
| 1470 | } |
| 1471 | |
| 1472 | if (!silent) |
| 1473 | fat_msg(sb, KERN_INFO, |
| 1474 | "This looks like a DOS 1.x volume; assuming default BPB values"); |
| 1475 | |
| 1476 | memset(bpb, 0, sizeof(*bpb)); |
| 1477 | bpb->fat_sector_size = SECTOR_SIZE; |
| 1478 | bpb->fat_sec_per_clus = fdefaults->sec_per_clus; |
| 1479 | bpb->fat_reserved = 1; |
| 1480 | bpb->fat_fats = 2; |
| 1481 | bpb->fat_dir_entries = fdefaults->dir_entries; |
| 1482 | bpb->fat_sectors = fdefaults->nr_sectors; |
| 1483 | bpb->fat_fat_length = fdefaults->fat_length; |
| 1484 | |
| 1485 | error = 0; |
| 1486 | |
| 1487 | out: |
| 1488 | return error; |
| 1489 | } |
| 1490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | /* |
| 1492 | * Read the super block of an MS-DOS FS. |
| 1493 | */ |
OGAWA Hirofumi | 384f5c9 | 2011-04-12 21:08:37 +0900 | [diff] [blame] | 1494 | 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] | 1495 | void (*setup)(struct super_block *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | { |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1497 | struct inode *root_inode = NULL, *fat_inode = NULL; |
Artem Bityutskiy | 020ac5b | 2012-05-31 16:26:12 -0700 | [diff] [blame] | 1498 | struct inode *fsinfo_inode = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | struct buffer_head *bh; |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1500 | struct fat_bios_param_block bpb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | struct msdos_sb_info *sbi; |
| 1502 | u16 logical_sector_size; |
| 1503 | u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; |
| 1504 | int debug; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | long error; |
| 1506 | char buf[50]; |
| 1507 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 1508 | /* |
| 1509 | * GFP_KERNEL is ok here, because while we do hold the |
| 1510 | * supeblock lock, memory pressure can't call back into |
| 1511 | * the filesystem, since we're only just about to mount |
| 1512 | * it and have no inodes etc active! |
| 1513 | */ |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 1514 | sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | if (!sbi) |
| 1516 | return -ENOMEM; |
| 1517 | sb->s_fs_info = sbi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | |
| 1519 | sb->s_flags |= MS_NODIRATIME; |
| 1520 | sb->s_magic = MSDOS_SUPER_MAGIC; |
| 1521 | sb->s_op = &fat_sops; |
| 1522 | sb->s_export_op = &fat_export_ops; |
Namjae Jeon | 8fceb4e | 2013-04-29 16:21:12 -0700 | [diff] [blame] | 1523 | mutex_init(&sbi->nfs_build_inode_lock); |
OGAWA Hirofumi | aaa04b4 | 2010-05-24 14:33:12 -0700 | [diff] [blame] | 1524 | ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, |
| 1525 | DEFAULT_RATELIMIT_BURST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1527 | error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | if (error) |
| 1529 | goto out_fail; |
| 1530 | |
Al Viro | 3d23985 | 2010-12-18 10:44:00 -0500 | [diff] [blame] | 1531 | setup(sb); /* flavour-specific stuff that needs options */ |
| 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | error = -EIO; |
| 1534 | sb_min_blocksize(sb, 512); |
| 1535 | bh = sb_bread(sb, 0); |
| 1536 | if (bh == NULL) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1537 | fat_msg(sb, KERN_ERR, "unable to read boot sector"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | goto out_fail; |
| 1539 | } |
| 1540 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1541 | error = fat_read_bpb(sb, (struct fat_boot_sector *)bh->b_data, silent, |
| 1542 | &bpb); |
| 1543 | if (error == -EINVAL && sbi->options.dos1xfloppy) |
| 1544 | error = fat_read_static_bpb(sb, |
| 1545 | (struct fat_boot_sector *)bh->b_data, silent, &bpb); |
| 1546 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1548 | if (error == -EINVAL) |
| 1549 | goto out_invalid; |
| 1550 | else if (error) |
| 1551 | goto out_fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1553 | logical_sector_size = bpb.fat_sector_size; |
| 1554 | sbi->sec_per_clus = bpb.fat_sec_per_clus; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1556 | error = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | if (logical_sector_size < sb->s_blocksize) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1558 | fat_msg(sb, KERN_ERR, "logical sector size too small for device" |
| 1559 | " (logical sector size = %u)", logical_sector_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | goto out_fail; |
| 1561 | } |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | if (logical_sector_size > sb->s_blocksize) { |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1564 | struct buffer_head *bh_resize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
| 1566 | if (!sb_set_blocksize(sb, logical_sector_size)) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1567 | fat_msg(sb, KERN_ERR, "unable to set blocksize %u", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | logical_sector_size); |
| 1569 | goto out_fail; |
| 1570 | } |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1571 | |
| 1572 | /* Verify that the larger boot sector is fully readable */ |
| 1573 | bh_resize = sb_bread(sb, 0); |
| 1574 | if (bh_resize == NULL) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1575 | fat_msg(sb, KERN_ERR, "unable to read boot sector" |
| 1576 | " (logical sector size = %lu)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | sb->s_blocksize); |
| 1578 | goto out_fail; |
| 1579 | } |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1580 | brelse(bh_resize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | } |
| 1582 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 1583 | mutex_init(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; |
| 1585 | sbi->cluster_bits = ffs(sbi->cluster_size) - 1; |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1586 | sbi->fats = bpb.fat_fats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | sbi->fat_bits = 0; /* Don't know yet */ |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1588 | sbi->fat_start = bpb.fat_reserved; |
| 1589 | sbi->fat_length = bpb.fat_fat_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | sbi->root_cluster = 0; |
| 1591 | sbi->free_clusters = -1; /* Don't know yet */ |
OGAWA Hirofumi | 606e423 | 2008-04-28 02:16:27 -0700 | [diff] [blame] | 1592 | sbi->free_clus_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | sbi->prev_free = FAT_START_ENT; |
Namjae Jeon | 710d440 | 2011-08-17 19:10:09 +0900 | [diff] [blame] | 1594 | sb->s_maxbytes = 0xffffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1596 | if (!sbi->fat_length && bpb.fat32_length) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | struct fat_boot_fsinfo *fsinfo; |
| 1598 | struct buffer_head *fsinfo_bh; |
| 1599 | |
| 1600 | /* Must be FAT32 */ |
| 1601 | sbi->fat_bits = 32; |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1602 | sbi->fat_length = bpb.fat32_length; |
| 1603 | sbi->root_cluster = bpb.fat32_root_cluster; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | /* MC - if info_sector is 0, don't multiply by 0 */ |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1606 | sbi->fsinfo_sector = bpb.fat32_info_sector; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | if (sbi->fsinfo_sector == 0) |
| 1608 | sbi->fsinfo_sector = 1; |
| 1609 | |
| 1610 | fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); |
| 1611 | if (fsinfo_bh == NULL) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1612 | fat_msg(sb, KERN_ERR, "bread failed, FSINFO block" |
| 1613 | " (sector = %lu)", sbi->fsinfo_sector); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | goto out_fail; |
| 1615 | } |
| 1616 | |
| 1617 | fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; |
| 1618 | if (!IS_FSINFO(fsinfo)) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1619 | fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: " |
| 1620 | "0x%08x, 0x%08x (sector = %lu)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | le32_to_cpu(fsinfo->signature1), |
| 1622 | le32_to_cpu(fsinfo->signature2), |
| 1623 | sbi->fsinfo_sector); |
| 1624 | } else { |
OGAWA Hirofumi | 28ec039 | 2007-05-08 00:31:01 -0700 | [diff] [blame] | 1625 | if (sbi->options.usefree) |
OGAWA Hirofumi | 606e423 | 2008-04-28 02:16:27 -0700 | [diff] [blame] | 1626 | sbi->free_clus_valid = 1; |
| 1627 | sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); |
| 1629 | } |
| 1630 | |
| 1631 | brelse(fsinfo_bh); |
| 1632 | } |
| 1633 | |
Mike Lockwood | 6e5b93e | 2013-07-08 16:00:46 -0700 | [diff] [blame] | 1634 | /* interpret volume ID as a little endian 32 bit integer */ |
| 1635 | if (sbi->fat_bits == 32) |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1636 | sbi->vol_id = bpb.fat32_vol_id; |
Mike Lockwood | 6e5b93e | 2013-07-08 16:00:46 -0700 | [diff] [blame] | 1637 | else /* fat 16 or 12 */ |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1638 | sbi->vol_id = bpb.fat16_vol_id; |
Mike Lockwood | 6e5b93e | 2013-07-08 16:00:46 -0700 | [diff] [blame] | 1639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); |
| 1641 | sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; |
| 1642 | |
| 1643 | sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1644 | sbi->dir_entries = bpb.fat_dir_entries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | if (sbi->dir_entries & (sbi->dir_per_block - 1)) { |
| 1646 | if (!silent) |
Ravishankar N | c39540c | 2012-12-20 15:05:46 -0800 | [diff] [blame] | 1647 | fat_msg(sb, KERN_ERR, "bogus directory-entries per block" |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1648 | " (%u)", sbi->dir_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | goto out_invalid; |
| 1650 | } |
| 1651 | |
| 1652 | rootdir_sectors = sbi->dir_entries |
| 1653 | * sizeof(struct msdos_dir_entry) / sb->s_blocksize; |
| 1654 | sbi->data_start = sbi->dir_start + rootdir_sectors; |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1655 | total_sectors = bpb.fat_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | if (total_sectors == 0) |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1657 | total_sectors = bpb.fat_total_sect; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | |
| 1659 | total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; |
| 1660 | |
| 1661 | if (sbi->fat_bits != 32) |
| 1662 | sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; |
| 1663 | |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 1664 | /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */ |
| 1665 | if (sbi->fat_bits == 32) |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1666 | sbi->dirty = bpb.fat32_state & FAT_STATE_DIRTY; |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 1667 | else /* fat 16 or 12 */ |
Conrad Meyer | 190a884 | 2014-06-06 14:36:37 -0700 | [diff] [blame] | 1668 | sbi->dirty = bpb.fat16_state & FAT_STATE_DIRTY; |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 1669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | /* check that FAT table does not overflow */ |
OGAWA Hirofumi | 7b92d03 | 2013-05-24 15:55:08 -0700 | [diff] [blame] | 1671 | fat_clusters = calc_fat_clusters(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); |
| 1673 | if (total_clusters > MAX_FAT(sb)) { |
| 1674 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1675 | fat_msg(sb, KERN_ERR, "count of clusters too big (%u)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | total_clusters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | goto out_invalid; |
| 1678 | } |
| 1679 | |
| 1680 | sbi->max_cluster = total_clusters + FAT_START_ENT; |
| 1681 | /* check the free_clusters, it's not necessarily correct */ |
| 1682 | if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) |
| 1683 | sbi->free_clusters = -1; |
| 1684 | /* check the prev_free, it's not necessarily correct */ |
| 1685 | sbi->prev_free %= sbi->max_cluster; |
| 1686 | if (sbi->prev_free < FAT_START_ENT) |
| 1687 | sbi->prev_free = FAT_START_ENT; |
| 1688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | /* set up enough so that it can read an inode */ |
| 1690 | fat_hash_init(sb); |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 1691 | dir_hash_init(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | fat_ent_access_init(sb); |
| 1693 | |
| 1694 | /* |
| 1695 | * The low byte of FAT's first entry must have same value with |
| 1696 | * media-field. But in real world, too many devices is |
| 1697 | * writing wrong value. So, removed that validity check. |
| 1698 | * |
| 1699 | * if (FAT_FIRST_ENT(sb, media) != first) |
| 1700 | */ |
| 1701 | |
| 1702 | error = -EINVAL; |
| 1703 | sprintf(buf, "cp%d", sbi->options.codepage); |
| 1704 | sbi->nls_disk = load_nls(buf); |
| 1705 | if (!sbi->nls_disk) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1706 | fat_msg(sb, KERN_ERR, "codepage %s not found", buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | goto out_fail; |
| 1708 | } |
| 1709 | |
| 1710 | /* FIXME: utf8 is using iocharset for upper/lower conversion */ |
| 1711 | if (sbi->options.isvfat) { |
| 1712 | sbi->nls_io = load_nls(sbi->options.iocharset); |
| 1713 | if (!sbi->nls_io) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1714 | fat_msg(sb, KERN_ERR, "IO charset %s not found", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | sbi->options.iocharset); |
| 1716 | goto out_fail; |
| 1717 | } |
| 1718 | } |
| 1719 | |
| 1720 | error = -ENOMEM; |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1721 | fat_inode = new_inode(sb); |
| 1722 | if (!fat_inode) |
| 1723 | goto out_fail; |
| 1724 | MSDOS_I(fat_inode)->i_pos = 0; |
| 1725 | sbi->fat_inode = fat_inode; |
Artem Bityutskiy | 020ac5b | 2012-05-31 16:26:12 -0700 | [diff] [blame] | 1726 | |
| 1727 | fsinfo_inode = new_inode(sb); |
| 1728 | if (!fsinfo_inode) |
| 1729 | goto out_fail; |
| 1730 | fsinfo_inode->i_ino = MSDOS_FSINFO_INO; |
| 1731 | sbi->fsinfo_inode = fsinfo_inode; |
| 1732 | insert_inode_hash(fsinfo_inode); |
| 1733 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | root_inode = new_inode(sb); |
| 1735 | if (!root_inode) |
| 1736 | goto out_fail; |
| 1737 | root_inode->i_ino = MSDOS_ROOT_INO; |
| 1738 | root_inode->i_version = 1; |
| 1739 | error = fat_read_root(root_inode); |
Al Viro | 1688f86 | 2012-02-12 22:06:33 -0500 | [diff] [blame] | 1740 | if (error < 0) { |
| 1741 | iput(root_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | goto out_fail; |
Al Viro | 1688f86 | 2012-02-12 22:06:33 -0500 | [diff] [blame] | 1743 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | error = -ENOMEM; |
| 1745 | insert_inode_hash(root_inode); |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 1746 | fat_attach(root_inode, 0); |
Al Viro | 1688f86 | 2012-02-12 22:06:33 -0500 | [diff] [blame] | 1747 | sb->s_root = d_make_root(root_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | if (!sb->s_root) { |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1749 | fat_msg(sb, KERN_ERR, "get root inode failed"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | goto out_fail; |
| 1751 | } |
| 1752 | |
Namjae Jeon | f562146 | 2012-12-17 16:02:56 -0800 | [diff] [blame] | 1753 | if (sbi->options.discard) { |
| 1754 | struct request_queue *q = bdev_get_queue(sb->s_bdev); |
| 1755 | if (!blk_queue_discard(q)) |
| 1756 | fat_msg(sb, KERN_WARNING, |
| 1757 | "mounting with \"discard\" option, but " |
| 1758 | "the device does not support discard"); |
| 1759 | } |
| 1760 | |
Oleksij Rempel | b88a1058 | 2013-02-27 17:03:09 -0800 | [diff] [blame] | 1761 | fat_set_state(sb, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | return 0; |
| 1763 | |
| 1764 | out_invalid: |
| 1765 | error = -EINVAL; |
| 1766 | if (!silent) |
Alexey Fisher | 869f58c | 2011-04-12 21:08:38 +0900 | [diff] [blame] | 1767 | fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | |
| 1769 | out_fail: |
Artem Bityutskiy | 020ac5b | 2012-05-31 16:26:12 -0700 | [diff] [blame] | 1770 | if (fsinfo_inode) |
| 1771 | iput(fsinfo_inode); |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1772 | if (fat_inode) |
| 1773 | iput(fat_inode); |
OGAWA Hirofumi | 1bdb6f9 | 2010-03-16 05:48:09 +0900 | [diff] [blame] | 1774 | unload_nls(sbi->nls_io); |
| 1775 | unload_nls(sbi->nls_disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | if (sbi->options.iocharset != fat_default_iocharset) |
| 1777 | kfree(sbi->options.iocharset); |
| 1778 | sb->s_fs_info = NULL; |
| 1779 | kfree(sbi); |
| 1780 | return error; |
| 1781 | } |
| 1782 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 1783 | EXPORT_SYMBOL_GPL(fat_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1785 | /* |
| 1786 | * helper function for fat_flush_inodes. This writes both the inode |
| 1787 | * and the file data blocks, waiting for in flight data blocks before |
| 1788 | * the start of the call. It does not wait for any io started |
| 1789 | * during the call |
| 1790 | */ |
| 1791 | static int writeback_inode(struct inode *inode) |
| 1792 | { |
| 1793 | |
| 1794 | int ret; |
Namjae Jeon | 1486465 | 2012-10-04 17:15:04 -0700 | [diff] [blame] | 1795 | |
| 1796 | /* if we used wait=1, sync_inode_metadata waits for the io for the |
| 1797 | * inode to finish. So wait=0 is sent down to sync_inode_metadata |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1798 | * and filemap_fdatawrite is used for the data blocks |
| 1799 | */ |
Namjae Jeon | 1486465 | 2012-10-04 17:15:04 -0700 | [diff] [blame] | 1800 | ret = sync_inode_metadata(inode, 0); |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1801 | if (!ret) |
Namjae Jeon | 1486465 | 2012-10-04 17:15:04 -0700 | [diff] [blame] | 1802 | ret = filemap_fdatawrite(inode->i_mapping); |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1803 | return ret; |
| 1804 | } |
| 1805 | |
| 1806 | /* |
| 1807 | * write data and metadata corresponding to i1 and i2. The io is |
| 1808 | * started but we do not wait for any of it to finish. |
| 1809 | * |
| 1810 | * filemap_flush is used for the block device, so if there is a dirty |
| 1811 | * page for a block already in flight, we will not wait and start the |
| 1812 | * io over again |
| 1813 | */ |
| 1814 | int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) |
| 1815 | { |
| 1816 | int ret = 0; |
| 1817 | if (!MSDOS_SB(sb)->options.flush) |
| 1818 | return 0; |
| 1819 | if (i1) |
| 1820 | ret = writeback_inode(i1); |
| 1821 | if (!ret && i2) |
| 1822 | ret = writeback_inode(i2); |
Eric Sesterhenn | 97e860d | 2006-10-11 01:21:59 -0700 | [diff] [blame] | 1823 | if (!ret) { |
Chris Mason | ae78bf9 | 2006-09-29 02:00:03 -0700 | [diff] [blame] | 1824 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; |
| 1825 | ret = filemap_flush(mapping); |
| 1826 | } |
| 1827 | return ret; |
| 1828 | } |
| 1829 | EXPORT_SYMBOL_GPL(fat_flush_inodes); |
| 1830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | static int __init init_fat_fs(void) |
| 1832 | { |
Pekka J Enberg | 532a39a | 2005-06-30 02:59:01 -0700 | [diff] [blame] | 1833 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | |
Pekka J Enberg | 532a39a | 2005-06-30 02:59:01 -0700 | [diff] [blame] | 1835 | err = fat_cache_init(); |
| 1836 | if (err) |
| 1837 | return err; |
| 1838 | |
| 1839 | err = fat_init_inodecache(); |
| 1840 | if (err) |
| 1841 | goto failed; |
| 1842 | |
| 1843 | return 0; |
| 1844 | |
| 1845 | failed: |
| 1846 | fat_cache_destroy(); |
| 1847 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | } |
| 1849 | |
| 1850 | static void __exit exit_fat_fs(void) |
| 1851 | { |
| 1852 | fat_cache_destroy(); |
| 1853 | fat_destroy_inodecache(); |
| 1854 | } |
| 1855 | |
| 1856 | module_init(init_fat_fs) |
| 1857 | module_exit(exit_fat_fs) |
| 1858 | |
| 1859 | MODULE_LICENSE("GPL"); |