11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/fat/inode.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Written 1992,1993 by Werner Almesberger 51da177e4SLinus Torvalds * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner 61da177e4SLinus Torvalds * Rewritten for the constant inumbers support by Al Viro 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Fixes: 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0 111da177e4SLinus Torvalds */ 121da177e4SLinus Torvalds 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/pagemap.h> 15a5425d29SOGAWA Hirofumi #include <linux/mpage.h> 161da177e4SLinus Torvalds #include <linux/vfs.h> 1758932ef7SAlexander Kuleshov #include <linux/seq_file.h> 181da177e4SLinus Torvalds #include <linux/parser.h> 19e5174baaSOGAWA Hirofumi #include <linux/uio.h> 20f562146aSNamjae Jeon #include <linux/blkdev.h> 2166114cadSTejun Heo #include <linux/backing-dev.h> 221da177e4SLinus Torvalds #include <asm/unaligned.h> 239e975daeSOGAWA Hirofumi #include "fat.h" 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #ifndef CONFIG_FAT_DEFAULT_IOCHARSET 261da177e4SLinus Torvalds /* if user don't select VFAT, this is undefined. */ 271da177e4SLinus Torvalds #define CONFIG_FAT_DEFAULT_IOCHARSET "" 281da177e4SLinus Torvalds #endif 291da177e4SLinus Torvalds 30190a8843SConrad Meyer #define KB_IN_SECTORS 2 31190a8843SConrad Meyer 32190a8843SConrad Meyer /* 33190a8843SConrad Meyer * A deserialized copy of the on-disk structure laid out in struct 34190a8843SConrad Meyer * fat_boot_sector. 35190a8843SConrad Meyer */ 36190a8843SConrad Meyer struct fat_bios_param_block { 37190a8843SConrad Meyer u16 fat_sector_size; 38190a8843SConrad Meyer u8 fat_sec_per_clus; 39190a8843SConrad Meyer u16 fat_reserved; 40190a8843SConrad Meyer u8 fat_fats; 41190a8843SConrad Meyer u16 fat_dir_entries; 42190a8843SConrad Meyer u16 fat_sectors; 43190a8843SConrad Meyer u16 fat_fat_length; 44190a8843SConrad Meyer u32 fat_total_sect; 45190a8843SConrad Meyer 46190a8843SConrad Meyer u8 fat16_state; 47190a8843SConrad Meyer u32 fat16_vol_id; 48190a8843SConrad Meyer 49190a8843SConrad Meyer u32 fat32_length; 50190a8843SConrad Meyer u32 fat32_root_cluster; 51190a8843SConrad Meyer u16 fat32_info_sector; 52190a8843SConrad Meyer u8 fat32_state; 53190a8843SConrad Meyer u32 fat32_vol_id; 54190a8843SConrad Meyer }; 55190a8843SConrad Meyer 561da177e4SLinus Torvalds static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; 571da177e4SLinus Torvalds static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; 581da177e4SLinus Torvalds 59190a8843SConrad Meyer static struct fat_floppy_defaults { 60190a8843SConrad Meyer unsigned nr_sectors; 61190a8843SConrad Meyer unsigned sec_per_clus; 62190a8843SConrad Meyer unsigned dir_entries; 63190a8843SConrad Meyer unsigned media; 64190a8843SConrad Meyer unsigned fat_length; 65190a8843SConrad Meyer } floppy_defaults[] = { 66190a8843SConrad Meyer { 67190a8843SConrad Meyer .nr_sectors = 160 * KB_IN_SECTORS, 68190a8843SConrad Meyer .sec_per_clus = 1, 69190a8843SConrad Meyer .dir_entries = 64, 70190a8843SConrad Meyer .media = 0xFE, 71190a8843SConrad Meyer .fat_length = 1, 72190a8843SConrad Meyer }, 73190a8843SConrad Meyer { 74190a8843SConrad Meyer .nr_sectors = 180 * KB_IN_SECTORS, 75190a8843SConrad Meyer .sec_per_clus = 1, 76190a8843SConrad Meyer .dir_entries = 64, 77190a8843SConrad Meyer .media = 0xFC, 78190a8843SConrad Meyer .fat_length = 2, 79190a8843SConrad Meyer }, 80190a8843SConrad Meyer { 81190a8843SConrad Meyer .nr_sectors = 320 * KB_IN_SECTORS, 82190a8843SConrad Meyer .sec_per_clus = 2, 83190a8843SConrad Meyer .dir_entries = 112, 84190a8843SConrad Meyer .media = 0xFF, 85190a8843SConrad Meyer .fat_length = 1, 86190a8843SConrad Meyer }, 87190a8843SConrad Meyer { 88190a8843SConrad Meyer .nr_sectors = 360 * KB_IN_SECTORS, 89190a8843SConrad Meyer .sec_per_clus = 2, 90190a8843SConrad Meyer .dir_entries = 112, 91190a8843SConrad Meyer .media = 0xFD, 92190a8843SConrad Meyer .fat_length = 2, 93190a8843SConrad Meyer }, 94190a8843SConrad Meyer }; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds static int fat_add_cluster(struct inode *inode) 971da177e4SLinus Torvalds { 981da177e4SLinus Torvalds int err, cluster; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds err = fat_alloc_clusters(inode, &cluster, 1); 1011da177e4SLinus Torvalds if (err) 1021da177e4SLinus Torvalds return err; 1031da177e4SLinus Torvalds /* FIXME: this cluster should be added after data of this 1041da177e4SLinus Torvalds * cluster is writed */ 1051da177e4SLinus Torvalds err = fat_chain_add(inode, cluster, 1); 1061da177e4SLinus Torvalds if (err) 1071da177e4SLinus Torvalds fat_free_clusters(inode, cluster); 1081da177e4SLinus Torvalds return err; 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 1116a1d9805SOGAWA Hirofumi static inline int __fat_get_block(struct inode *inode, sector_t iblock, 112e5174baaSOGAWA Hirofumi unsigned long *max_blocks, 1131da177e4SLinus Torvalds struct buffer_head *bh_result, int create) 1141da177e4SLinus Torvalds { 1151da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 116e5174baaSOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(sb); 117e5174baaSOGAWA Hirofumi unsigned long mapped_blocks; 1186a1d9805SOGAWA Hirofumi sector_t phys; 119e5174baaSOGAWA Hirofumi int err, offset; 1201da177e4SLinus Torvalds 1212bdf67ebSOGAWA Hirofumi err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); 1221da177e4SLinus Torvalds if (err) 1231da177e4SLinus Torvalds return err; 1241da177e4SLinus Torvalds if (phys) { 1251da177e4SLinus Torvalds map_bh(bh_result, sb, phys); 126e5174baaSOGAWA Hirofumi *max_blocks = min(mapped_blocks, *max_blocks); 1271da177e4SLinus Torvalds return 0; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds if (!create) 1301da177e4SLinus Torvalds return 0; 131e5174baaSOGAWA Hirofumi 1321da177e4SLinus Torvalds if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { 13385c78591SDenis Karpov fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)", 1341da177e4SLinus Torvalds MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); 1351da177e4SLinus Torvalds return -EIO; 1361da177e4SLinus Torvalds } 137e5174baaSOGAWA Hirofumi 138e5174baaSOGAWA Hirofumi offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); 139e5174baaSOGAWA Hirofumi if (!offset) { 140e5174baaSOGAWA Hirofumi /* TODO: multiple cluster allocation would be desirable. */ 1411da177e4SLinus Torvalds err = fat_add_cluster(inode); 1421da177e4SLinus Torvalds if (err) 1431da177e4SLinus Torvalds return err; 1441da177e4SLinus Torvalds } 145e5174baaSOGAWA Hirofumi /* available blocks on this cluster */ 146e5174baaSOGAWA Hirofumi mapped_blocks = sbi->sec_per_clus - offset; 147e5174baaSOGAWA Hirofumi 148e5174baaSOGAWA Hirofumi *max_blocks = min(mapped_blocks, *max_blocks); 149e5174baaSOGAWA Hirofumi MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; 150e5174baaSOGAWA Hirofumi 1512bdf67ebSOGAWA Hirofumi err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); 1521da177e4SLinus Torvalds if (err) 1531da177e4SLinus Torvalds return err; 1546a1d9805SOGAWA Hirofumi 155e5174baaSOGAWA Hirofumi BUG_ON(!phys); 156e5174baaSOGAWA Hirofumi BUG_ON(*max_blocks != mapped_blocks); 1571da177e4SLinus Torvalds set_buffer_new(bh_result); 1581da177e4SLinus Torvalds map_bh(bh_result, sb, phys); 1591da177e4SLinus Torvalds 160e5174baaSOGAWA Hirofumi return 0; 161e5174baaSOGAWA Hirofumi } 162e5174baaSOGAWA Hirofumi 163e5174baaSOGAWA Hirofumi static int fat_get_block(struct inode *inode, sector_t iblock, 164e5174baaSOGAWA Hirofumi struct buffer_head *bh_result, int create) 165e5174baaSOGAWA Hirofumi { 1666a1d9805SOGAWA Hirofumi struct super_block *sb = inode->i_sb; 1676a1d9805SOGAWA Hirofumi unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; 1686a1d9805SOGAWA Hirofumi int err; 1696a1d9805SOGAWA Hirofumi 1706a1d9805SOGAWA Hirofumi err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); 1716a1d9805SOGAWA Hirofumi if (err) 1726a1d9805SOGAWA Hirofumi return err; 1736a1d9805SOGAWA Hirofumi bh_result->b_size = max_blocks << sb->s_blocksize_bits; 1746a1d9805SOGAWA Hirofumi return 0; 175e5174baaSOGAWA Hirofumi } 176e5174baaSOGAWA Hirofumi 1771da177e4SLinus Torvalds static int fat_writepage(struct page *page, struct writeback_control *wbc) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds return block_write_full_page(page, fat_get_block, wbc); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 182a5425d29SOGAWA Hirofumi static int fat_writepages(struct address_space *mapping, 183a5425d29SOGAWA Hirofumi struct writeback_control *wbc) 184a5425d29SOGAWA Hirofumi { 185a5425d29SOGAWA Hirofumi return mpage_writepages(mapping, wbc, fat_get_block); 186a5425d29SOGAWA Hirofumi } 187a5425d29SOGAWA Hirofumi 1881da177e4SLinus Torvalds static int fat_readpage(struct file *file, struct page *page) 1891da177e4SLinus Torvalds { 190a5425d29SOGAWA Hirofumi return mpage_readpage(page, fat_get_block); 191a5425d29SOGAWA Hirofumi } 192a5425d29SOGAWA Hirofumi 193a5425d29SOGAWA Hirofumi static int fat_readpages(struct file *file, struct address_space *mapping, 194a5425d29SOGAWA Hirofumi struct list_head *pages, unsigned nr_pages) 195a5425d29SOGAWA Hirofumi { 196a5425d29SOGAWA Hirofumi return mpage_readpages(mapping, pages, nr_pages, fat_get_block); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 199459f6ed3Snpiggin@suse.de static void fat_write_failed(struct address_space *mapping, loff_t to) 200459f6ed3Snpiggin@suse.de { 201459f6ed3Snpiggin@suse.de struct inode *inode = mapping->host; 202459f6ed3Snpiggin@suse.de 203459f6ed3Snpiggin@suse.de if (to > inode->i_size) { 2047caef267SKirill A. Shutemov truncate_pagecache(inode, inode->i_size); 205459f6ed3Snpiggin@suse.de fat_truncate_blocks(inode, inode->i_size); 206459f6ed3Snpiggin@suse.de } 207459f6ed3Snpiggin@suse.de } 208459f6ed3Snpiggin@suse.de 209d7777a25SNick Piggin static int fat_write_begin(struct file *file, struct address_space *mapping, 210d7777a25SNick Piggin loff_t pos, unsigned len, unsigned flags, 211d7777a25SNick Piggin struct page **pagep, void **fsdata) 2121da177e4SLinus Torvalds { 213459f6ed3Snpiggin@suse.de int err; 214459f6ed3Snpiggin@suse.de 215d7777a25SNick Piggin *pagep = NULL; 216282dc178SChristoph Hellwig err = cont_write_begin(file, mapping, pos, len, flags, 217459f6ed3Snpiggin@suse.de pagep, fsdata, fat_get_block, 218d7777a25SNick Piggin &MSDOS_I(mapping->host)->mmu_private); 219459f6ed3Snpiggin@suse.de if (err < 0) 220459f6ed3Snpiggin@suse.de fat_write_failed(mapping, pos + len); 221459f6ed3Snpiggin@suse.de return err; 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds 224d7777a25SNick Piggin static int fat_write_end(struct file *file, struct address_space *mapping, 225d7777a25SNick Piggin loff_t pos, unsigned len, unsigned copied, 226d7777a25SNick Piggin struct page *pagep, void *fsdata) 227ef402268SOGAWA Hirofumi { 228d7777a25SNick Piggin struct inode *inode = mapping->host; 229d7777a25SNick Piggin int err; 230d7777a25SNick Piggin err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); 231459f6ed3Snpiggin@suse.de if (err < len) 232459f6ed3Snpiggin@suse.de fat_write_failed(mapping, pos + len); 233d7777a25SNick Piggin if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { 234ef402268SOGAWA Hirofumi inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; 235ef402268SOGAWA Hirofumi MSDOS_I(inode)->i_attrs |= ATTR_ARCH; 236ef402268SOGAWA Hirofumi mark_inode_dirty(inode); 237ef402268SOGAWA Hirofumi } 238ef402268SOGAWA Hirofumi return err; 239ef402268SOGAWA Hirofumi } 240ef402268SOGAWA Hirofumi 24122c6186eSOmar Sandoval static ssize_t fat_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 242d8d3d94bSAl Viro loff_t offset) 243e5174baaSOGAWA Hirofumi { 244e5174baaSOGAWA Hirofumi struct file *file = iocb->ki_filp; 245459f6ed3Snpiggin@suse.de struct address_space *mapping = file->f_mapping; 246459f6ed3Snpiggin@suse.de struct inode *inode = mapping->host; 247a6cbcd4aSAl Viro size_t count = iov_iter_count(iter); 248459f6ed3Snpiggin@suse.de ssize_t ret; 249e5174baaSOGAWA Hirofumi 2506f673763SOmar Sandoval if (iov_iter_rw(iter) == WRITE) { 251e5174baaSOGAWA Hirofumi /* 2524e02ed4bSNick Piggin * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), 253e5174baaSOGAWA Hirofumi * so we need to update the ->mmu_private to block boundary. 254e5174baaSOGAWA Hirofumi * 255e5174baaSOGAWA Hirofumi * But we must fill the remaining area or hole by nul for 256e5174baaSOGAWA Hirofumi * updating ->mmu_private. 25794412a96SOGAWA Hirofumi * 25894412a96SOGAWA Hirofumi * Return 0, and fallback to normal buffered write. 259e5174baaSOGAWA Hirofumi */ 260a6cbcd4aSAl Viro loff_t size = offset + count; 261e5174baaSOGAWA Hirofumi if (MSDOS_I(inode)->mmu_private < size) 26294412a96SOGAWA Hirofumi return 0; 263e5174baaSOGAWA Hirofumi } 264e5174baaSOGAWA Hirofumi 265e5174baaSOGAWA Hirofumi /* 266e5174baaSOGAWA Hirofumi * FAT need to use the DIO_LOCKING for avoiding the race 267e5174baaSOGAWA Hirofumi * condition of fat_get_block() and ->truncate(). 268e5174baaSOGAWA Hirofumi */ 26917f8c842SOmar Sandoval ret = blockdev_direct_IO(iocb, inode, iter, offset, fat_get_block); 2706f673763SOmar Sandoval if (ret < 0 && iov_iter_rw(iter) == WRITE) 271a6cbcd4aSAl Viro fat_write_failed(mapping, offset + count); 272459f6ed3Snpiggin@suse.de 273459f6ed3Snpiggin@suse.de return ret; 274e5174baaSOGAWA Hirofumi } 275e5174baaSOGAWA Hirofumi 2761da177e4SLinus Torvalds static sector_t _fat_bmap(struct address_space *mapping, sector_t block) 2771da177e4SLinus Torvalds { 278fa93ca18SOGAWA Hirofumi sector_t blocknr; 279fa93ca18SOGAWA Hirofumi 280fa93ca18SOGAWA Hirofumi /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ 28158268691SChristoph Hellwig down_read(&MSDOS_I(mapping->host)->truncate_lock); 282fa93ca18SOGAWA Hirofumi blocknr = generic_block_bmap(mapping, block, fat_get_block); 28358268691SChristoph Hellwig up_read(&MSDOS_I(mapping->host)->truncate_lock); 284fa93ca18SOGAWA Hirofumi 285fa93ca18SOGAWA Hirofumi return blocknr; 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 288c0ef0cc9SNamjae Jeon /* 289c0ef0cc9SNamjae Jeon * fat_block_truncate_page() zeroes out a mapping from file offset `from' 290c0ef0cc9SNamjae Jeon * up to the end of the block which corresponds to `from'. 291c0ef0cc9SNamjae Jeon * This is required during truncate to physically zeroout the tail end 292c0ef0cc9SNamjae Jeon * of that block so it doesn't yield old data if the file is later grown. 293c0ef0cc9SNamjae Jeon * Also, avoid causing failure from fsx for cases of "data past EOF" 294c0ef0cc9SNamjae Jeon */ 295c0ef0cc9SNamjae Jeon int fat_block_truncate_page(struct inode *inode, loff_t from) 296c0ef0cc9SNamjae Jeon { 297c0ef0cc9SNamjae Jeon return block_truncate_page(inode->i_mapping, from, fat_get_block); 298c0ef0cc9SNamjae Jeon } 299c0ef0cc9SNamjae Jeon 300f5e54d6eSChristoph Hellwig static const struct address_space_operations fat_aops = { 3011da177e4SLinus Torvalds .readpage = fat_readpage, 302a5425d29SOGAWA Hirofumi .readpages = fat_readpages, 3031da177e4SLinus Torvalds .writepage = fat_writepage, 304a5425d29SOGAWA Hirofumi .writepages = fat_writepages, 305d7777a25SNick Piggin .write_begin = fat_write_begin, 306d7777a25SNick Piggin .write_end = fat_write_end, 307e5174baaSOGAWA Hirofumi .direct_IO = fat_direct_IO, 3081da177e4SLinus Torvalds .bmap = _fat_bmap 3091da177e4SLinus Torvalds }; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds /* 3121da177e4SLinus Torvalds * New FAT inode stuff. We do the following: 3131da177e4SLinus Torvalds * a) i_ino is constant and has nothing with on-disk location. 3141da177e4SLinus Torvalds * b) FAT manages its own cache of directory entries. 3151da177e4SLinus Torvalds * c) *This* cache is indexed by on-disk location. 3161da177e4SLinus Torvalds * d) inode has an associated directory entry, all right, but 3171da177e4SLinus Torvalds * it may be unhashed. 3181da177e4SLinus Torvalds * e) currently entries are stored within struct inode. That should 3191da177e4SLinus Torvalds * change. 3201da177e4SLinus Torvalds * f) we deal with races in the following way: 3211da177e4SLinus Torvalds * 1. readdir() and lookup() do FAT-dir-cache lookup. 3221da177e4SLinus Torvalds * 2. rename() unhashes the F-d-c entry and rehashes it in 3231da177e4SLinus Torvalds * a new place. 3241da177e4SLinus Torvalds * 3. unlink() and rmdir() unhash F-d-c entry. 3251da177e4SLinus Torvalds * 4. fat_write_inode() checks whether the thing is unhashed. 3261da177e4SLinus Torvalds * If it is we silently return. If it isn't we do bread(), 3271da177e4SLinus Torvalds * check if the location is still valid and retry if it 3281da177e4SLinus Torvalds * isn't. Otherwise we do changes. 3291da177e4SLinus Torvalds * 5. Spinlock is used to protect hash/unhash/location check/lookup 330deee3ce4SAl Viro * 6. fat_evict_inode() unhashes the F-d-c entry. 3311da177e4SLinus Torvalds * 7. lookup() and readdir() do igrab() if they find a F-d-c entry 3321da177e4SLinus Torvalds * and consider negative result as cache miss. 3331da177e4SLinus Torvalds */ 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds static void fat_hash_init(struct super_block *sb) 3361da177e4SLinus Torvalds { 3371da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 3381da177e4SLinus Torvalds int i; 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds spin_lock_init(&sbi->inode_hash_lock); 3411da177e4SLinus Torvalds for (i = 0; i < FAT_HASH_SIZE; i++) 3421da177e4SLinus Torvalds INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 345d3dfa822SOGAWA Hirofumi static inline unsigned long fat_hash(loff_t i_pos) 3461da177e4SLinus Torvalds { 347d3dfa822SOGAWA Hirofumi return hash_32(i_pos, FAT_HASH_BITS); 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 3507669e8fbSSteven J. Magnani static void dir_hash_init(struct super_block *sb) 3517669e8fbSSteven J. Magnani { 3527669e8fbSSteven J. Magnani struct msdos_sb_info *sbi = MSDOS_SB(sb); 3537669e8fbSSteven J. Magnani int i; 3547669e8fbSSteven J. Magnani 3557669e8fbSSteven J. Magnani spin_lock_init(&sbi->dir_hash_lock); 3567669e8fbSSteven J. Magnani for (i = 0; i < FAT_HASH_SIZE; i++) 3577669e8fbSSteven J. Magnani INIT_HLIST_HEAD(&sbi->dir_hashtable[i]); 3587669e8fbSSteven J. Magnani } 3597669e8fbSSteven J. Magnani 3601da177e4SLinus Torvalds void fat_attach(struct inode *inode, loff_t i_pos) 3611da177e4SLinus Torvalds { 362d3dfa822SOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 3637669e8fbSSteven J. Magnani 3647669e8fbSSteven J. Magnani if (inode->i_ino != MSDOS_ROOT_INO) { 3657669e8fbSSteven J. Magnani struct hlist_head *head = sbi->inode_hashtable 3667669e8fbSSteven J. Magnani + fat_hash(i_pos); 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 3691da177e4SLinus Torvalds MSDOS_I(inode)->i_pos = i_pos; 370d3dfa822SOGAWA Hirofumi hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); 3711da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 3721da177e4SLinus Torvalds } 3737669e8fbSSteven J. Magnani 3747669e8fbSSteven J. Magnani /* If NFS support is enabled, cache the mapping of start cluster 3757669e8fbSSteven J. Magnani * to directory inode. This is used during reconnection of 3767669e8fbSSteven J. Magnani * dentries to the filesystem root. 3777669e8fbSSteven J. Magnani */ 3787669e8fbSSteven J. Magnani if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { 3797669e8fbSSteven J. Magnani struct hlist_head *d_head = sbi->dir_hashtable; 3807669e8fbSSteven J. Magnani d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart); 3817669e8fbSSteven J. Magnani 3827669e8fbSSteven J. Magnani spin_lock(&sbi->dir_hash_lock); 3837669e8fbSSteven J. Magnani hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head); 3847669e8fbSSteven J. Magnani spin_unlock(&sbi->dir_hash_lock); 3857669e8fbSSteven J. Magnani } 3867669e8fbSSteven J. Magnani } 3877c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_attach); 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds void fat_detach(struct inode *inode) 3901da177e4SLinus Torvalds { 3911da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 3921da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 3931da177e4SLinus Torvalds MSDOS_I(inode)->i_pos = 0; 3941da177e4SLinus Torvalds hlist_del_init(&MSDOS_I(inode)->i_fat_hash); 3951da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 3967669e8fbSSteven J. Magnani 3977669e8fbSSteven J. Magnani if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { 3987669e8fbSSteven J. Magnani spin_lock(&sbi->dir_hash_lock); 3997669e8fbSSteven J. Magnani hlist_del_init(&MSDOS_I(inode)->i_dir_hash); 4007669e8fbSSteven J. Magnani spin_unlock(&sbi->dir_hash_lock); 4017669e8fbSSteven J. Magnani } 4021da177e4SLinus Torvalds } 4037c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_detach); 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds struct inode *fat_iget(struct super_block *sb, loff_t i_pos) 4061da177e4SLinus Torvalds { 4071da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 408d3dfa822SOGAWA Hirofumi struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); 4091da177e4SLinus Torvalds struct msdos_inode_info *i; 4101da177e4SLinus Torvalds struct inode *inode = NULL; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 413b67bfe0dSSasha Levin hlist_for_each_entry(i, head, i_fat_hash) { 4141da177e4SLinus Torvalds BUG_ON(i->vfs_inode.i_sb != sb); 4151da177e4SLinus Torvalds if (i->i_pos != i_pos) 4161da177e4SLinus Torvalds continue; 4171da177e4SLinus Torvalds inode = igrab(&i->vfs_inode); 4181da177e4SLinus Torvalds if (inode) 4191da177e4SLinus Torvalds break; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 4221da177e4SLinus Torvalds return inode; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds static int is_exec(unsigned char *extension) 4261da177e4SLinus Torvalds { 427ef19470eSManuel Schölling unsigned char exe_extensions[] = "EXECOMBAT", *walk; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds for (walk = exe_extensions; *walk; walk += 3) 4301da177e4SLinus Torvalds if (!strncmp(extension, walk, 3)) 4311da177e4SLinus Torvalds return 1; 4321da177e4SLinus Torvalds return 0; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds static int fat_calc_dir_size(struct inode *inode) 4361da177e4SLinus Torvalds { 4371da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 4381da177e4SLinus Torvalds int ret, fclus, dclus; 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds inode->i_size = 0; 4411da177e4SLinus Torvalds if (MSDOS_I(inode)->i_start == 0) 4421da177e4SLinus Torvalds return 0; 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); 4451da177e4SLinus Torvalds if (ret < 0) 4461da177e4SLinus Torvalds return ret; 4471da177e4SLinus Torvalds inode->i_size = (fclus + 1) << sbi->cluster_bits; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds return 0; 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds /* doesn't deal with root inode */ 453f1e6fb0aSNamjae Jeon int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) 4541da177e4SLinus Torvalds { 4551da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 4561da177e4SLinus Torvalds int error; 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds MSDOS_I(inode)->i_pos = 0; 4591da177e4SLinus Torvalds inode->i_uid = sbi->options.fs_uid; 4601da177e4SLinus Torvalds inode->i_gid = sbi->options.fs_gid; 4611da177e4SLinus Torvalds inode->i_version++; 4621da177e4SLinus Torvalds inode->i_generation = get_seconds(); 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { 4651da177e4SLinus Torvalds inode->i_generation &= ~1; 4669c0aa1b8SOGAWA Hirofumi inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO); 4671da177e4SLinus Torvalds inode->i_op = sbi->dir_ops; 4681da177e4SLinus Torvalds inode->i_fop = &fat_dir_operations; 4691da177e4SLinus Torvalds 470a943ed71SSteven J. Magnani MSDOS_I(inode)->i_start = fat_get_start(sbi, de); 4711da177e4SLinus Torvalds MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; 4721da177e4SLinus Torvalds error = fat_calc_dir_size(inode); 4731da177e4SLinus Torvalds if (error < 0) 4741da177e4SLinus Torvalds return error; 4751da177e4SLinus Torvalds MSDOS_I(inode)->mmu_private = inode->i_size; 4761da177e4SLinus Torvalds 477bfe86848SMiklos Szeredi set_nlink(inode, fat_subdirs(inode)); 4781da177e4SLinus Torvalds } else { /* not a directory */ 4791da177e4SLinus Torvalds inode->i_generation |= 1; 4809c0aa1b8SOGAWA Hirofumi inode->i_mode = fat_make_mode(sbi, de->attr, 4819aacd599SOGAWA Hirofumi ((sbi->options.showexec && !is_exec(de->name + 8)) 4829c0aa1b8SOGAWA Hirofumi ? S_IRUGO|S_IWUGO : S_IRWXUGO)); 483a943ed71SSteven J. Magnani MSDOS_I(inode)->i_start = fat_get_start(sbi, de); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; 4861da177e4SLinus Torvalds inode->i_size = le32_to_cpu(de->size); 4871da177e4SLinus Torvalds inode->i_op = &fat_file_inode_operations; 4881da177e4SLinus Torvalds inode->i_fop = &fat_file_operations; 4891da177e4SLinus Torvalds inode->i_mapping->a_ops = &fat_aops; 4901da177e4SLinus Torvalds MSDOS_I(inode)->mmu_private = inode->i_size; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds if (de->attr & ATTR_SYS) { 4931da177e4SLinus Torvalds if (sbi->options.sys_immutable) 4941da177e4SLinus Torvalds inode->i_flags |= S_IMMUTABLE; 4951da177e4SLinus Torvalds } 4969c0aa1b8SOGAWA Hirofumi fat_save_attrs(inode, de->attr); 4979c0aa1b8SOGAWA Hirofumi 4981da177e4SLinus Torvalds inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) 4991da177e4SLinus Torvalds & ~((loff_t)sbi->cluster_size - 1)) >> 9; 5007decd1cbSOGAWA Hirofumi 5017decd1cbSOGAWA Hirofumi fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); 5021da177e4SLinus Torvalds if (sbi->options.isvfat) { 5037decd1cbSOGAWA Hirofumi fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, 5047decd1cbSOGAWA Hirofumi de->cdate, de->ctime_cs); 5057decd1cbSOGAWA Hirofumi fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); 5061da177e4SLinus Torvalds } else 50762a36c43SStephane Kardas inode->i_ctime = inode->i_atime = inode->i_mtime; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds return 0; 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds 5128fceb4e0SNamjae Jeon static inline void fat_lock_build_inode(struct msdos_sb_info *sbi) 5138fceb4e0SNamjae Jeon { 5148fceb4e0SNamjae Jeon if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) 5158fceb4e0SNamjae Jeon mutex_lock(&sbi->nfs_build_inode_lock); 5168fceb4e0SNamjae Jeon } 5178fceb4e0SNamjae Jeon 5188fceb4e0SNamjae Jeon static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi) 5198fceb4e0SNamjae Jeon { 5208fceb4e0SNamjae Jeon if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) 5218fceb4e0SNamjae Jeon mutex_unlock(&sbi->nfs_build_inode_lock); 5228fceb4e0SNamjae Jeon } 5238fceb4e0SNamjae Jeon 5241da177e4SLinus Torvalds struct inode *fat_build_inode(struct super_block *sb, 5251da177e4SLinus Torvalds struct msdos_dir_entry *de, loff_t i_pos) 5261da177e4SLinus Torvalds { 5271da177e4SLinus Torvalds struct inode *inode; 5281da177e4SLinus Torvalds int err; 5291da177e4SLinus Torvalds 5308fceb4e0SNamjae Jeon fat_lock_build_inode(MSDOS_SB(sb)); 5311da177e4SLinus Torvalds inode = fat_iget(sb, i_pos); 5321da177e4SLinus Torvalds if (inode) 5331da177e4SLinus Torvalds goto out; 5341da177e4SLinus Torvalds inode = new_inode(sb); 5351da177e4SLinus Torvalds if (!inode) { 5361da177e4SLinus Torvalds inode = ERR_PTR(-ENOMEM); 5371da177e4SLinus Torvalds goto out; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds inode->i_ino = iunique(sb, MSDOS_ROOT_INO); 5401da177e4SLinus Torvalds inode->i_version = 1; 5411da177e4SLinus Torvalds err = fat_fill_inode(inode, de); 5421da177e4SLinus Torvalds if (err) { 5431da177e4SLinus Torvalds iput(inode); 5441da177e4SLinus Torvalds inode = ERR_PTR(err); 5451da177e4SLinus Torvalds goto out; 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds fat_attach(inode, i_pos); 5481da177e4SLinus Torvalds insert_inode_hash(inode); 5491da177e4SLinus Torvalds out: 5508fceb4e0SNamjae Jeon fat_unlock_build_inode(MSDOS_SB(sb)); 5511da177e4SLinus Torvalds return inode; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 5547c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_build_inode); 5551da177e4SLinus Torvalds 556deee3ce4SAl Viro static void fat_evict_inode(struct inode *inode) 5571da177e4SLinus Torvalds { 55891b0abe3SJohannes Weiner truncate_inode_pages_final(&inode->i_data); 559deee3ce4SAl Viro if (!inode->i_nlink) { 5601da177e4SLinus Torvalds inode->i_size = 0; 561459f6ed3Snpiggin@suse.de fat_truncate_blocks(inode, 0); 5621da177e4SLinus Torvalds } 563deee3ce4SAl Viro invalidate_inode_buffers(inode); 564dbd5768fSJan Kara clear_inode(inode); 5651da177e4SLinus Torvalds fat_cache_inval_inode(inode); 566a993b542SOGAWA Hirofumi fat_detach(inode); 5671da177e4SLinus Torvalds } 5681da177e4SLinus Torvalds 569b88a1058SOleksij Rempel static void fat_set_state(struct super_block *sb, 570b88a1058SOleksij Rempel unsigned int set, unsigned int force) 571b88a1058SOleksij Rempel { 572b88a1058SOleksij Rempel struct buffer_head *bh; 573b88a1058SOleksij Rempel struct fat_boot_sector *b; 574d6bd4282SFred Chou struct msdos_sb_info *sbi = MSDOS_SB(sb); 575b88a1058SOleksij Rempel 576b88a1058SOleksij Rempel /* do not change any thing if mounted read only */ 577b88a1058SOleksij Rempel if ((sb->s_flags & MS_RDONLY) && !force) 578b88a1058SOleksij Rempel return; 579b88a1058SOleksij Rempel 580b88a1058SOleksij Rempel /* do not change state if fs was dirty */ 581b88a1058SOleksij Rempel if (sbi->dirty) { 582b88a1058SOleksij Rempel /* warn only on set (mount). */ 583b88a1058SOleksij Rempel if (set) 584b88a1058SOleksij Rempel fat_msg(sb, KERN_WARNING, "Volume was not properly " 585b88a1058SOleksij Rempel "unmounted. Some data may be corrupt. " 586b88a1058SOleksij Rempel "Please run fsck."); 587b88a1058SOleksij Rempel return; 588b88a1058SOleksij Rempel } 589b88a1058SOleksij Rempel 590b88a1058SOleksij Rempel bh = sb_bread(sb, 0); 591b88a1058SOleksij Rempel if (bh == NULL) { 592b88a1058SOleksij Rempel fat_msg(sb, KERN_ERR, "unable to read boot sector " 593b88a1058SOleksij Rempel "to mark fs as dirty"); 594b88a1058SOleksij Rempel return; 595b88a1058SOleksij Rempel } 596b88a1058SOleksij Rempel 597b88a1058SOleksij Rempel b = (struct fat_boot_sector *) bh->b_data; 598b88a1058SOleksij Rempel 599b88a1058SOleksij Rempel if (sbi->fat_bits == 32) { 600b88a1058SOleksij Rempel if (set) 601b88a1058SOleksij Rempel b->fat32.state |= FAT_STATE_DIRTY; 602b88a1058SOleksij Rempel else 603b88a1058SOleksij Rempel b->fat32.state &= ~FAT_STATE_DIRTY; 604b88a1058SOleksij Rempel } else /* fat 16 and 12 */ { 605b88a1058SOleksij Rempel if (set) 606b88a1058SOleksij Rempel b->fat16.state |= FAT_STATE_DIRTY; 607b88a1058SOleksij Rempel else 608b88a1058SOleksij Rempel b->fat16.state &= ~FAT_STATE_DIRTY; 609b88a1058SOleksij Rempel } 610b88a1058SOleksij Rempel 611b88a1058SOleksij Rempel mark_buffer_dirty(bh); 612b88a1058SOleksij Rempel sync_dirty_buffer(bh); 613b88a1058SOleksij Rempel brelse(bh); 614b88a1058SOleksij Rempel } 615b88a1058SOleksij Rempel 616cac45b06SAl Viro static void delayed_free(struct rcu_head *p) 617cac45b06SAl Viro { 618cac45b06SAl Viro struct msdos_sb_info *sbi = container_of(p, struct msdos_sb_info, rcu); 619cac45b06SAl Viro unload_nls(sbi->nls_disk); 620cac45b06SAl Viro unload_nls(sbi->nls_io); 621cac45b06SAl Viro if (sbi->options.iocharset != fat_default_iocharset) 622cac45b06SAl Viro kfree(sbi->options.iocharset); 623cac45b06SAl Viro kfree(sbi); 624cac45b06SAl Viro } 625cac45b06SAl Viro 626a6bf6b21SOGAWA Hirofumi static void fat_put_super(struct super_block *sb) 627a6bf6b21SOGAWA Hirofumi { 628a6bf6b21SOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(sb); 6291da177e4SLinus Torvalds 630b88a1058SOleksij Rempel fat_set_state(sb, 0, 0); 631b88a1058SOleksij Rempel 632020ac5b6SArtem Bityutskiy iput(sbi->fsinfo_inode); 633b522412aSAl Viro iput(sbi->fat_inode); 634b522412aSAl Viro 635cac45b06SAl Viro call_rcu(&sbi->rcu, delayed_free); 6361da177e4SLinus Torvalds } 6371da177e4SLinus Torvalds 638e18b890bSChristoph Lameter static struct kmem_cache *fat_inode_cachep; 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds static struct inode *fat_alloc_inode(struct super_block *sb) 6411da177e4SLinus Torvalds { 6421da177e4SLinus Torvalds struct msdos_inode_info *ei; 6438f593427SLinus Torvalds ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); 6441da177e4SLinus Torvalds if (!ei) 6451da177e4SLinus Torvalds return NULL; 64658268691SChristoph Hellwig 64758268691SChristoph Hellwig init_rwsem(&ei->truncate_lock); 6481da177e4SLinus Torvalds return &ei->vfs_inode; 6491da177e4SLinus Torvalds } 6501da177e4SLinus Torvalds 651fa0d7e3dSNick Piggin static void fat_i_callback(struct rcu_head *head) 652fa0d7e3dSNick Piggin { 653fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 654fa0d7e3dSNick Piggin kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); 655fa0d7e3dSNick Piggin } 656fa0d7e3dSNick Piggin 6571da177e4SLinus Torvalds static void fat_destroy_inode(struct inode *inode) 6581da177e4SLinus Torvalds { 659fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, fat_i_callback); 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 66251cc5068SAlexey Dobriyan static void init_once(void *foo) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds spin_lock_init(&ei->cache_lru_lock); 6671da177e4SLinus Torvalds ei->nr_caches = 0; 6681da177e4SLinus Torvalds ei->cache_valid_id = FAT_CACHE_VALID + 1; 6691da177e4SLinus Torvalds INIT_LIST_HEAD(&ei->cache_lru); 6701da177e4SLinus Torvalds INIT_HLIST_NODE(&ei->i_fat_hash); 6717669e8fbSSteven J. Magnani INIT_HLIST_NODE(&ei->i_dir_hash); 6721da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds static int __init fat_init_inodecache(void) 6761da177e4SLinus Torvalds { 6771da177e4SLinus Torvalds fat_inode_cachep = kmem_cache_create("fat_inode_cache", 6781da177e4SLinus Torvalds sizeof(struct msdos_inode_info), 679fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 6805d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT), 68120c2df83SPaul Mundt init_once); 6821da177e4SLinus Torvalds if (fat_inode_cachep == NULL) 6831da177e4SLinus Torvalds return -ENOMEM; 6841da177e4SLinus Torvalds return 0; 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds static void __exit fat_destroy_inodecache(void) 6881da177e4SLinus Torvalds { 6898c0a8537SKirill A. Shutemov /* 6908c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 6918c0a8537SKirill A. Shutemov * destroy cache. 6928c0a8537SKirill A. Shutemov */ 6938c0a8537SKirill A. Shutemov rcu_barrier(); 6941a1d92c1SAlexey Dobriyan kmem_cache_destroy(fat_inode_cachep); 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds static int fat_remount(struct super_block *sb, int *flags, char *data) 6981da177e4SLinus Torvalds { 699b88a1058SOleksij Rempel int new_rdonly; 7001da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 7011da177e4SLinus Torvalds *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME); 702b88a1058SOleksij Rempel 70302b9984dSTheodore Ts'o sync_filesystem(sb); 70402b9984dSTheodore Ts'o 705b88a1058SOleksij Rempel /* make sure we update state on remount. */ 706b88a1058SOleksij Rempel new_rdonly = *flags & MS_RDONLY; 707b88a1058SOleksij Rempel if (new_rdonly != (sb->s_flags & MS_RDONLY)) { 708b88a1058SOleksij Rempel if (new_rdonly) 709b88a1058SOleksij Rempel fat_set_state(sb, 0, 0); 710b88a1058SOleksij Rempel else 711b88a1058SOleksij Rempel fat_set_state(sb, 1, 1); 712b88a1058SOleksij Rempel } 7131da177e4SLinus Torvalds return 0; 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds 716726c3342SDavid Howells static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) 7171da177e4SLinus Torvalds { 718aac49b75SColy Li struct super_block *sb = dentry->d_sb; 719aac49b75SColy Li struct msdos_sb_info *sbi = MSDOS_SB(sb); 720aac49b75SColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds /* If the count of free cluster is still unknown, counts it here. */ 723606e423eSOGAWA Hirofumi if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { 724726c3342SDavid Howells int err = fat_count_free_clusters(dentry->d_sb); 7251da177e4SLinus Torvalds if (err) 7261da177e4SLinus Torvalds return err; 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds 729726c3342SDavid Howells buf->f_type = dentry->d_sb->s_magic; 7301da177e4SLinus Torvalds buf->f_bsize = sbi->cluster_size; 7311da177e4SLinus Torvalds buf->f_blocks = sbi->max_cluster - FAT_START_ENT; 7321da177e4SLinus Torvalds buf->f_bfree = sbi->free_clusters; 7331da177e4SLinus Torvalds buf->f_bavail = sbi->free_clusters; 734aac49b75SColy Li buf->f_fsid.val[0] = (u32)id; 735aac49b75SColy Li buf->f_fsid.val[1] = (u32)(id >> 32); 736f68e542fSOGAWA Hirofumi buf->f_namelen = 737f68e542fSOGAWA Hirofumi (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE; 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds return 0; 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds 742a9185b41SChristoph Hellwig static int __fat_write_inode(struct inode *inode, int wait) 7431da177e4SLinus Torvalds { 7441da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 7451da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 7461da177e4SLinus Torvalds struct buffer_head *bh; 7471da177e4SLinus Torvalds struct msdos_dir_entry *raw_entry; 7481da177e4SLinus Torvalds loff_t i_pos; 749e22a4442SNamjae Jeon sector_t blocknr; 750e22a4442SNamjae Jeon int err, offset; 7511da177e4SLinus Torvalds 7529ca59f4cSOGAWA Hirofumi if (inode->i_ino == MSDOS_ROOT_INO) 7539ca59f4cSOGAWA Hirofumi return 0; 7549ca59f4cSOGAWA Hirofumi 7551da177e4SLinus Torvalds retry: 7569ca59f4cSOGAWA Hirofumi i_pos = fat_i_pos_read(sbi, inode); 7579ca59f4cSOGAWA Hirofumi if (!i_pos) 7581da177e4SLinus Torvalds return 0; 7591da177e4SLinus Torvalds 760e22a4442SNamjae Jeon fat_get_blknr_offset(sbi, i_pos, &blocknr, &offset); 761e22a4442SNamjae Jeon bh = sb_bread(sb, blocknr); 7621da177e4SLinus Torvalds if (!bh) { 763869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to read inode block " 764869f58c0SAlexey Fisher "for updating (i_pos %lld)", i_pos); 7655f22ca9bSLinus Torvalds return -EIO; 7661da177e4SLinus Torvalds } 7671da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 7681da177e4SLinus Torvalds if (i_pos != MSDOS_I(inode)->i_pos) { 7691da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 7701da177e4SLinus Torvalds brelse(bh); 7711da177e4SLinus Torvalds goto retry; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds 774e22a4442SNamjae Jeon raw_entry = &((struct msdos_dir_entry *) (bh->b_data))[offset]; 7751da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 7761da177e4SLinus Torvalds raw_entry->size = 0; 7771da177e4SLinus Torvalds else 7781da177e4SLinus Torvalds raw_entry->size = cpu_to_le32(inode->i_size); 7799c0aa1b8SOGAWA Hirofumi raw_entry->attr = fat_make_attrs(inode); 780a943ed71SSteven J. Magnani fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart); 7817decd1cbSOGAWA Hirofumi fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, 7827decd1cbSOGAWA Hirofumi &raw_entry->date, NULL); 7831da177e4SLinus Torvalds if (sbi->options.isvfat) { 78462a36c43SStephane Kardas __le16 atime; 7857decd1cbSOGAWA Hirofumi fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, 7867decd1cbSOGAWA Hirofumi &raw_entry->cdate, &raw_entry->ctime_cs); 7877decd1cbSOGAWA Hirofumi fat_time_unix2fat(sbi, &inode->i_atime, &atime, 7887decd1cbSOGAWA Hirofumi &raw_entry->adate, NULL); 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 7911da177e4SLinus Torvalds mark_buffer_dirty(bh); 7925f22ca9bSLinus Torvalds err = 0; 7931da177e4SLinus Torvalds if (wait) 7941da177e4SLinus Torvalds err = sync_dirty_buffer(bh); 7951da177e4SLinus Torvalds brelse(bh); 7961da177e4SLinus Torvalds return err; 7971da177e4SLinus Torvalds } 7981da177e4SLinus Torvalds 799a9185b41SChristoph Hellwig static int fat_write_inode(struct inode *inode, struct writeback_control *wbc) 800a9185b41SChristoph Hellwig { 80178491189SArtem Bityutskiy int err; 80278491189SArtem Bityutskiy 80378491189SArtem Bityutskiy if (inode->i_ino == MSDOS_FSINFO_INO) { 80478491189SArtem Bityutskiy struct super_block *sb = inode->i_sb; 80578491189SArtem Bityutskiy 806e40b34c7SMarco Stornelli mutex_lock(&MSDOS_SB(sb)->s_lock); 80778491189SArtem Bityutskiy err = fat_clusters_flush(sb); 808e40b34c7SMarco Stornelli mutex_unlock(&MSDOS_SB(sb)->s_lock); 80978491189SArtem Bityutskiy } else 81078491189SArtem Bityutskiy err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 81178491189SArtem Bityutskiy 81278491189SArtem Bityutskiy return err; 813a9185b41SChristoph Hellwig } 814a9185b41SChristoph Hellwig 8151da177e4SLinus Torvalds int fat_sync_inode(struct inode *inode) 8161da177e4SLinus Torvalds { 817a9185b41SChristoph Hellwig return __fat_write_inode(inode, 1); 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 8207c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_sync_inode); 8211da177e4SLinus Torvalds 82234c80b1dSAl Viro static int fat_show_options(struct seq_file *m, struct dentry *root); 823ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations fat_sops = { 8241da177e4SLinus Torvalds .alloc_inode = fat_alloc_inode, 8251da177e4SLinus Torvalds .destroy_inode = fat_destroy_inode, 8261da177e4SLinus Torvalds .write_inode = fat_write_inode, 827deee3ce4SAl Viro .evict_inode = fat_evict_inode, 8281da177e4SLinus Torvalds .put_super = fat_put_super, 8291da177e4SLinus Torvalds .statfs = fat_statfs, 8301da177e4SLinus Torvalds .remount_fs = fat_remount, 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds .show_options = fat_show_options, 8331da177e4SLinus Torvalds }; 8341da177e4SLinus Torvalds 83534c80b1dSAl Viro static int fat_show_options(struct seq_file *m, struct dentry *root) 8361da177e4SLinus Torvalds { 83734c80b1dSAl Viro struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb); 8381da177e4SLinus Torvalds struct fat_mount_options *opts = &sbi->options; 8391da177e4SLinus Torvalds int isvfat = opts->isvfat; 8401da177e4SLinus Torvalds 841170782ebSEric W. Biederman if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) 842170782ebSEric W. Biederman seq_printf(m, ",uid=%u", 843170782ebSEric W. Biederman from_kuid_munged(&init_user_ns, opts->fs_uid)); 844170782ebSEric W. Biederman if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) 845170782ebSEric W. Biederman seq_printf(m, ",gid=%u", 846170782ebSEric W. Biederman from_kgid_munged(&init_user_ns, opts->fs_gid)); 8471da177e4SLinus Torvalds seq_printf(m, ",fmask=%04o", opts->fs_fmask); 8481da177e4SLinus Torvalds seq_printf(m, ",dmask=%04o", opts->fs_dmask); 8491ae43f82SOGAWA Hirofumi if (opts->allow_utime) 8501ae43f82SOGAWA Hirofumi seq_printf(m, ",allow_utime=%04o", opts->allow_utime); 8511da177e4SLinus Torvalds if (sbi->nls_disk) 852c6c20372SDave Reisner /* strip "cp" prefix from displayed option */ 853c6c20372SDave Reisner seq_printf(m, ",codepage=%s", &sbi->nls_disk->charset[2]); 8541da177e4SLinus Torvalds if (isvfat) { 8551da177e4SLinus Torvalds if (sbi->nls_io) 8561da177e4SLinus Torvalds seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds switch (opts->shortname) { 8591da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: 8601da177e4SLinus Torvalds seq_puts(m, ",shortname=win95"); 8611da177e4SLinus Torvalds break; 8621da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: 8631da177e4SLinus Torvalds seq_puts(m, ",shortname=winnt"); 8641da177e4SLinus Torvalds break; 8651da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: 8661da177e4SLinus Torvalds seq_puts(m, ",shortname=mixed"); 8671da177e4SLinus Torvalds break; 8681da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: 86995523475SPaul Wise seq_puts(m, ",shortname=lower"); 8701da177e4SLinus Torvalds break; 8711da177e4SLinus Torvalds default: 8721da177e4SLinus Torvalds seq_puts(m, ",shortname=unknown"); 8731da177e4SLinus Torvalds break; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds if (opts->name_check != 'n') 8771da177e4SLinus Torvalds seq_printf(m, ",check=%c", opts->name_check); 87828ec039cSOGAWA Hirofumi if (opts->usefree) 87928ec039cSOGAWA Hirofumi seq_puts(m, ",usefree"); 8801da177e4SLinus Torvalds if (opts->quiet) 8811da177e4SLinus Torvalds seq_puts(m, ",quiet"); 8821da177e4SLinus Torvalds if (opts->showexec) 8831da177e4SLinus Torvalds seq_puts(m, ",showexec"); 8841da177e4SLinus Torvalds if (opts->sys_immutable) 8851da177e4SLinus Torvalds seq_puts(m, ",sys_immutable"); 8861da177e4SLinus Torvalds if (!isvfat) { 8871da177e4SLinus Torvalds if (opts->dotsOK) 8881da177e4SLinus Torvalds seq_puts(m, ",dotsOK=yes"); 8891da177e4SLinus Torvalds if (opts->nocase) 8901da177e4SLinus Torvalds seq_puts(m, ",nocase"); 8911da177e4SLinus Torvalds } else { 8921da177e4SLinus Torvalds if (opts->utf8) 8931da177e4SLinus Torvalds seq_puts(m, ",utf8"); 8941da177e4SLinus Torvalds if (opts->unicode_xlate) 8951da177e4SLinus Torvalds seq_puts(m, ",uni_xlate"); 8961da177e4SLinus Torvalds if (!opts->numtail) 8971da177e4SLinus Torvalds seq_puts(m, ",nonumtail"); 898dfc209c0SOGAWA Hirofumi if (opts->rodir) 899dfc209c0SOGAWA Hirofumi seq_puts(m, ",rodir"); 9001da177e4SLinus Torvalds } 901dfc209c0SOGAWA Hirofumi if (opts->flush) 902c1fca3b6SMiklos Szeredi seq_puts(m, ",flush"); 90358156c8fSJan Kara if (opts->tz_set) { 90458156c8fSJan Kara if (opts->time_offset) 90558156c8fSJan Kara seq_printf(m, ",time_offset=%d", opts->time_offset); 90658156c8fSJan Kara else 907b271e067SJoe Peterson seq_puts(m, ",tz=UTC"); 90858156c8fSJan Kara } 90985c78591SDenis Karpov if (opts->errors == FAT_ERRORS_CONT) 91085c78591SDenis Karpov seq_puts(m, ",errors=continue"); 91185c78591SDenis Karpov else if (opts->errors == FAT_ERRORS_PANIC) 91285c78591SDenis Karpov seq_puts(m, ",errors=panic"); 91385c78591SDenis Karpov else 91485c78591SDenis Karpov seq_puts(m, ",errors=remount-ro"); 9152628b7a6SNamjae Jeon if (opts->nfs == FAT_NFS_NOSTALE_RO) 9162628b7a6SNamjae Jeon seq_puts(m, ",nfs=nostale_ro"); 9172628b7a6SNamjae Jeon else if (opts->nfs) 9182628b7a6SNamjae Jeon seq_puts(m, ",nfs=stale_rw"); 919681142f9SChristoph Hellwig if (opts->discard) 920681142f9SChristoph Hellwig seq_puts(m, ",discard"); 921190a8843SConrad Meyer if (opts->dos1xfloppy) 922190a8843SConrad Meyer seq_puts(m, ",dos1xfloppy"); 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds return 0; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds enum { 9281da177e4SLinus Torvalds Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, 9291ae43f82SOGAWA Hirofumi Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, 9301ae43f82SOGAWA Hirofumi Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, 9311ae43f82SOGAWA Hirofumi Opt_immutable, Opt_dots, Opt_nodots, 9321da177e4SLinus Torvalds Opt_charset, Opt_shortname_lower, Opt_shortname_win95, 9331da177e4SLinus Torvalds Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, 9341da177e4SLinus Torvalds Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, 935d7a83c0fSGeert Uytterhoeven Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, 93658156c8fSJan Kara Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset, 937190a8843SConrad Meyer Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err, Opt_dos1xfloppy, 9381da177e4SLinus Torvalds }; 9391da177e4SLinus Torvalds 940a447c093SSteven Whitehouse static const match_table_t fat_tokens = { 9411da177e4SLinus Torvalds {Opt_check_r, "check=relaxed"}, 9421da177e4SLinus Torvalds {Opt_check_s, "check=strict"}, 9431da177e4SLinus Torvalds {Opt_check_n, "check=normal"}, 9441da177e4SLinus Torvalds {Opt_check_r, "check=r"}, 9451da177e4SLinus Torvalds {Opt_check_s, "check=s"}, 9461da177e4SLinus Torvalds {Opt_check_n, "check=n"}, 9471da177e4SLinus Torvalds {Opt_uid, "uid=%u"}, 9481da177e4SLinus Torvalds {Opt_gid, "gid=%u"}, 9491da177e4SLinus Torvalds {Opt_umask, "umask=%o"}, 9501da177e4SLinus Torvalds {Opt_dmask, "dmask=%o"}, 9511da177e4SLinus Torvalds {Opt_fmask, "fmask=%o"}, 9521ae43f82SOGAWA Hirofumi {Opt_allow_utime, "allow_utime=%o"}, 9531da177e4SLinus Torvalds {Opt_codepage, "codepage=%u"}, 95428ec039cSOGAWA Hirofumi {Opt_usefree, "usefree"}, 9551da177e4SLinus Torvalds {Opt_nocase, "nocase"}, 9561da177e4SLinus Torvalds {Opt_quiet, "quiet"}, 9571da177e4SLinus Torvalds {Opt_showexec, "showexec"}, 9581da177e4SLinus Torvalds {Opt_debug, "debug"}, 9591da177e4SLinus Torvalds {Opt_immutable, "sys_immutable"}, 96085c78591SDenis Karpov {Opt_flush, "flush"}, 96185c78591SDenis Karpov {Opt_tz_utc, "tz=UTC"}, 96258156c8fSJan Kara {Opt_time_offset, "time_offset=%d"}, 96385c78591SDenis Karpov {Opt_err_cont, "errors=continue"}, 96485c78591SDenis Karpov {Opt_err_panic, "errors=panic"}, 96585c78591SDenis Karpov {Opt_err_ro, "errors=remount-ro"}, 966681142f9SChristoph Hellwig {Opt_discard, "discard"}, 9672628b7a6SNamjae Jeon {Opt_nfs_stale_rw, "nfs"}, 9682628b7a6SNamjae Jeon {Opt_nfs_stale_rw, "nfs=stale_rw"}, 9692628b7a6SNamjae Jeon {Opt_nfs_nostale_ro, "nfs=nostale_ro"}, 970190a8843SConrad Meyer {Opt_dos1xfloppy, "dos1xfloppy"}, 971d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=binary"}, 972d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=text"}, 973d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=auto"}, 974d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=b"}, 975d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=t"}, 976d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=a"}, 977d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "fat=%u"}, 978d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "blocksize=%u"}, 979d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "cvf_format=%20s"}, 980d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "cvf_options=%100s"}, 981d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "posix"}, 982ae78bf9cSChris Mason {Opt_err, NULL}, 9831da177e4SLinus Torvalds }; 984a447c093SSteven Whitehouse static const match_table_t msdos_tokens = { 9851da177e4SLinus Torvalds {Opt_nodots, "nodots"}, 9861da177e4SLinus Torvalds {Opt_nodots, "dotsOK=no"}, 9871da177e4SLinus Torvalds {Opt_dots, "dots"}, 9881da177e4SLinus Torvalds {Opt_dots, "dotsOK=yes"}, 9891da177e4SLinus Torvalds {Opt_err, NULL} 9901da177e4SLinus Torvalds }; 991a447c093SSteven Whitehouse static const match_table_t vfat_tokens = { 9921da177e4SLinus Torvalds {Opt_charset, "iocharset=%s"}, 9931da177e4SLinus Torvalds {Opt_shortname_lower, "shortname=lower"}, 9941da177e4SLinus Torvalds {Opt_shortname_win95, "shortname=win95"}, 9951da177e4SLinus Torvalds {Opt_shortname_winnt, "shortname=winnt"}, 9961da177e4SLinus Torvalds {Opt_shortname_mixed, "shortname=mixed"}, 9971da177e4SLinus Torvalds {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ 9981da177e4SLinus Torvalds {Opt_utf8_no, "utf8=no"}, 9991da177e4SLinus Torvalds {Opt_utf8_no, "utf8=false"}, 10001da177e4SLinus Torvalds {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ 10011da177e4SLinus Torvalds {Opt_utf8_yes, "utf8=yes"}, 10021da177e4SLinus Torvalds {Opt_utf8_yes, "utf8=true"}, 10031da177e4SLinus Torvalds {Opt_utf8_yes, "utf8"}, 10041da177e4SLinus Torvalds {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ 10051da177e4SLinus Torvalds {Opt_uni_xl_no, "uni_xlate=no"}, 10061da177e4SLinus Torvalds {Opt_uni_xl_no, "uni_xlate=false"}, 10071da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ 10081da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate=yes"}, 10091da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate=true"}, 10101da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate"}, 10111da177e4SLinus Torvalds {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ 10121da177e4SLinus Torvalds {Opt_nonumtail_no, "nonumtail=no"}, 10131da177e4SLinus Torvalds {Opt_nonumtail_no, "nonumtail=false"}, 10141da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ 10151da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail=yes"}, 10161da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail=true"}, 10171da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail"}, 1018dfc209c0SOGAWA Hirofumi {Opt_rodir, "rodir"}, 10191da177e4SLinus Torvalds {Opt_err, NULL} 10201da177e4SLinus Torvalds }; 10211da177e4SLinus Torvalds 1022869f58c0SAlexey Fisher static int parse_options(struct super_block *sb, char *options, int is_vfat, 1023869f58c0SAlexey Fisher int silent, int *debug, struct fat_mount_options *opts) 10241da177e4SLinus Torvalds { 10251da177e4SLinus Torvalds char *p; 10261da177e4SLinus Torvalds substring_t args[MAX_OPT_ARGS]; 10271da177e4SLinus Torvalds int option; 10281da177e4SLinus Torvalds char *iocharset; 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds opts->isvfat = is_vfat; 10311da177e4SLinus Torvalds 1032f0ce7ee3SDavid Howells opts->fs_uid = current_uid(); 1033f0ce7ee3SDavid Howells opts->fs_gid = current_gid(); 10343e107603SOGAWA Hirofumi opts->fs_fmask = opts->fs_dmask = current_umask(); 10351ae43f82SOGAWA Hirofumi opts->allow_utime = -1; 10361da177e4SLinus Torvalds opts->codepage = fat_default_codepage; 10371da177e4SLinus Torvalds opts->iocharset = fat_default_iocharset; 1038dfc209c0SOGAWA Hirofumi if (is_vfat) { 103995523475SPaul Wise opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95; 1040dfc209c0SOGAWA Hirofumi opts->rodir = 0; 1041dfc209c0SOGAWA Hirofumi } else { 10421da177e4SLinus Torvalds opts->shortname = 0; 1043dfc209c0SOGAWA Hirofumi opts->rodir = 1; 1044dfc209c0SOGAWA Hirofumi } 10451da177e4SLinus Torvalds opts->name_check = 'n'; 10461da177e4SLinus Torvalds opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; 10471da177e4SLinus Torvalds opts->utf8 = opts->unicode_xlate = 0; 10481da177e4SLinus Torvalds opts->numtail = 1; 104928ec039cSOGAWA Hirofumi opts->usefree = opts->nocase = 0; 105058156c8fSJan Kara opts->tz_set = 0; 10517669e8fbSSteven J. Magnani opts->nfs = 0; 105285c78591SDenis Karpov opts->errors = FAT_ERRORS_RO; 10531da177e4SLinus Torvalds *debug = 0; 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds if (!options) 10568d44d974SOGAWA Hirofumi goto out; 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds while ((p = strsep(&options, ",")) != NULL) { 10591da177e4SLinus Torvalds int token; 10601da177e4SLinus Torvalds if (!*p) 10611da177e4SLinus Torvalds continue; 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds token = match_token(p, fat_tokens, args); 10641da177e4SLinus Torvalds if (token == Opt_err) { 10651da177e4SLinus Torvalds if (is_vfat) 10661da177e4SLinus Torvalds token = match_token(p, vfat_tokens, args); 10671da177e4SLinus Torvalds else 10681da177e4SLinus Torvalds token = match_token(p, msdos_tokens, args); 10691da177e4SLinus Torvalds } 10701da177e4SLinus Torvalds switch (token) { 10711da177e4SLinus Torvalds case Opt_check_s: 10721da177e4SLinus Torvalds opts->name_check = 's'; 10731da177e4SLinus Torvalds break; 10741da177e4SLinus Torvalds case Opt_check_r: 10751da177e4SLinus Torvalds opts->name_check = 'r'; 10761da177e4SLinus Torvalds break; 10771da177e4SLinus Torvalds case Opt_check_n: 10781da177e4SLinus Torvalds opts->name_check = 'n'; 10791da177e4SLinus Torvalds break; 108028ec039cSOGAWA Hirofumi case Opt_usefree: 108128ec039cSOGAWA Hirofumi opts->usefree = 1; 108228ec039cSOGAWA Hirofumi break; 10831da177e4SLinus Torvalds case Opt_nocase: 10841da177e4SLinus Torvalds if (!is_vfat) 10851da177e4SLinus Torvalds opts->nocase = 1; 10861da177e4SLinus Torvalds else { 10871da177e4SLinus Torvalds /* for backward compatibility */ 10881da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WIN95 10891da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds break; 10921da177e4SLinus Torvalds case Opt_quiet: 10931da177e4SLinus Torvalds opts->quiet = 1; 10941da177e4SLinus Torvalds break; 10951da177e4SLinus Torvalds case Opt_showexec: 10961da177e4SLinus Torvalds opts->showexec = 1; 10971da177e4SLinus Torvalds break; 10981da177e4SLinus Torvalds case Opt_debug: 10991da177e4SLinus Torvalds *debug = 1; 11001da177e4SLinus Torvalds break; 11011da177e4SLinus Torvalds case Opt_immutable: 11021da177e4SLinus Torvalds opts->sys_immutable = 1; 11031da177e4SLinus Torvalds break; 11041da177e4SLinus Torvalds case Opt_uid: 11051da177e4SLinus Torvalds if (match_int(&args[0], &option)) 11065b3d5aeaSJan Kara return -EINVAL; 1107170782ebSEric W. Biederman opts->fs_uid = make_kuid(current_user_ns(), option); 1108170782ebSEric W. Biederman if (!uid_valid(opts->fs_uid)) 11095b3d5aeaSJan Kara return -EINVAL; 11101da177e4SLinus Torvalds break; 11111da177e4SLinus Torvalds case Opt_gid: 11121da177e4SLinus Torvalds if (match_int(&args[0], &option)) 11135b3d5aeaSJan Kara return -EINVAL; 1114170782ebSEric W. Biederman opts->fs_gid = make_kgid(current_user_ns(), option); 1115170782ebSEric W. Biederman if (!gid_valid(opts->fs_gid)) 11165b3d5aeaSJan Kara return -EINVAL; 11171da177e4SLinus Torvalds break; 11181da177e4SLinus Torvalds case Opt_umask: 11191da177e4SLinus Torvalds if (match_octal(&args[0], &option)) 11205b3d5aeaSJan Kara return -EINVAL; 11211da177e4SLinus Torvalds opts->fs_fmask = opts->fs_dmask = option; 11221da177e4SLinus Torvalds break; 11231da177e4SLinus Torvalds case Opt_dmask: 11241da177e4SLinus Torvalds if (match_octal(&args[0], &option)) 11255b3d5aeaSJan Kara return -EINVAL; 11261da177e4SLinus Torvalds opts->fs_dmask = option; 11271da177e4SLinus Torvalds break; 11281da177e4SLinus Torvalds case Opt_fmask: 11291da177e4SLinus Torvalds if (match_octal(&args[0], &option)) 11305b3d5aeaSJan Kara return -EINVAL; 11311da177e4SLinus Torvalds opts->fs_fmask = option; 11321da177e4SLinus Torvalds break; 11331ae43f82SOGAWA Hirofumi case Opt_allow_utime: 11341ae43f82SOGAWA Hirofumi if (match_octal(&args[0], &option)) 11355b3d5aeaSJan Kara return -EINVAL; 11361ae43f82SOGAWA Hirofumi opts->allow_utime = option & (S_IWGRP | S_IWOTH); 11371ae43f82SOGAWA Hirofumi break; 11381da177e4SLinus Torvalds case Opt_codepage: 11391da177e4SLinus Torvalds if (match_int(&args[0], &option)) 11405b3d5aeaSJan Kara return -EINVAL; 11411da177e4SLinus Torvalds opts->codepage = option; 11421da177e4SLinus Torvalds break; 1143ae78bf9cSChris Mason case Opt_flush: 1144ae78bf9cSChris Mason opts->flush = 1; 1145ae78bf9cSChris Mason break; 114658156c8fSJan Kara case Opt_time_offset: 114758156c8fSJan Kara if (match_int(&args[0], &option)) 11485b3d5aeaSJan Kara return -EINVAL; 1149*a513d869SJan Kara /* 1150*a513d869SJan Kara * GMT+-12 zones may have DST corrections so at least 1151*a513d869SJan Kara * 13 hours difference is needed. Make the limit 24 1152*a513d869SJan Kara * just in case someone invents something unusual. 1153*a513d869SJan Kara */ 1154*a513d869SJan Kara if (option < -24 * 60 || option > 24 * 60) 11555b3d5aeaSJan Kara return -EINVAL; 115658156c8fSJan Kara opts->tz_set = 1; 115758156c8fSJan Kara opts->time_offset = option; 115858156c8fSJan Kara break; 1159b271e067SJoe Peterson case Opt_tz_utc: 116058156c8fSJan Kara opts->tz_set = 1; 116158156c8fSJan Kara opts->time_offset = 0; 1162b271e067SJoe Peterson break; 116385c78591SDenis Karpov case Opt_err_cont: 116485c78591SDenis Karpov opts->errors = FAT_ERRORS_CONT; 116585c78591SDenis Karpov break; 116685c78591SDenis Karpov case Opt_err_panic: 116785c78591SDenis Karpov opts->errors = FAT_ERRORS_PANIC; 116885c78591SDenis Karpov break; 116985c78591SDenis Karpov case Opt_err_ro: 117085c78591SDenis Karpov opts->errors = FAT_ERRORS_RO; 117185c78591SDenis Karpov break; 11722628b7a6SNamjae Jeon case Opt_nfs_stale_rw: 11732628b7a6SNamjae Jeon opts->nfs = FAT_NFS_STALE_RW; 11742628b7a6SNamjae Jeon break; 11752628b7a6SNamjae Jeon case Opt_nfs_nostale_ro: 11762628b7a6SNamjae Jeon opts->nfs = FAT_NFS_NOSTALE_RO; 11772628b7a6SNamjae Jeon break; 1178190a8843SConrad Meyer case Opt_dos1xfloppy: 1179190a8843SConrad Meyer opts->dos1xfloppy = 1; 1180190a8843SConrad Meyer break; 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds /* msdos specific */ 11831da177e4SLinus Torvalds case Opt_dots: 11841da177e4SLinus Torvalds opts->dotsOK = 1; 11851da177e4SLinus Torvalds break; 11861da177e4SLinus Torvalds case Opt_nodots: 11871da177e4SLinus Torvalds opts->dotsOK = 0; 11881da177e4SLinus Torvalds break; 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds /* vfat specific */ 11911da177e4SLinus Torvalds case Opt_charset: 11921da177e4SLinus Torvalds if (opts->iocharset != fat_default_iocharset) 11931da177e4SLinus Torvalds kfree(opts->iocharset); 11941da177e4SLinus Torvalds iocharset = match_strdup(&args[0]); 11951da177e4SLinus Torvalds if (!iocharset) 11961da177e4SLinus Torvalds return -ENOMEM; 11971da177e4SLinus Torvalds opts->iocharset = iocharset; 11981da177e4SLinus Torvalds break; 11991da177e4SLinus Torvalds case Opt_shortname_lower: 12001da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_LOWER 12011da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 12021da177e4SLinus Torvalds break; 12031da177e4SLinus Torvalds case Opt_shortname_win95: 12041da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WIN95 12051da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 12061da177e4SLinus Torvalds break; 12071da177e4SLinus Torvalds case Opt_shortname_winnt: 12081da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WINNT 12091da177e4SLinus Torvalds | VFAT_SFN_CREATE_WINNT; 12101da177e4SLinus Torvalds break; 12111da177e4SLinus Torvalds case Opt_shortname_mixed: 12121da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WINNT 12131da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 12141da177e4SLinus Torvalds break; 12151da177e4SLinus Torvalds case Opt_utf8_no: /* 0 or no or false */ 12161da177e4SLinus Torvalds opts->utf8 = 0; 12171da177e4SLinus Torvalds break; 12181da177e4SLinus Torvalds case Opt_utf8_yes: /* empty or 1 or yes or true */ 12191da177e4SLinus Torvalds opts->utf8 = 1; 12201da177e4SLinus Torvalds break; 12211da177e4SLinus Torvalds case Opt_uni_xl_no: /* 0 or no or false */ 12221da177e4SLinus Torvalds opts->unicode_xlate = 0; 12231da177e4SLinus Torvalds break; 12241da177e4SLinus Torvalds case Opt_uni_xl_yes: /* empty or 1 or yes or true */ 12251da177e4SLinus Torvalds opts->unicode_xlate = 1; 12261da177e4SLinus Torvalds break; 12271da177e4SLinus Torvalds case Opt_nonumtail_no: /* 0 or no or false */ 12281da177e4SLinus Torvalds opts->numtail = 1; /* negated option */ 12291da177e4SLinus Torvalds break; 12301da177e4SLinus Torvalds case Opt_nonumtail_yes: /* empty or 1 or yes or true */ 12311da177e4SLinus Torvalds opts->numtail = 0; /* negated option */ 12321da177e4SLinus Torvalds break; 1233dfc209c0SOGAWA Hirofumi case Opt_rodir: 1234dfc209c0SOGAWA Hirofumi opts->rodir = 1; 1235dfc209c0SOGAWA Hirofumi break; 1236681142f9SChristoph Hellwig case Opt_discard: 1237681142f9SChristoph Hellwig opts->discard = 1; 1238681142f9SChristoph Hellwig break; 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds /* obsolete mount options */ 1241d7a83c0fSGeert Uytterhoeven case Opt_obsolete: 1242869f58c0SAlexey Fisher fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, " 1243869f58c0SAlexey Fisher "not supported now", p); 12441da177e4SLinus Torvalds break; 12451da177e4SLinus Torvalds /* unknown option */ 12461da177e4SLinus Torvalds default: 124741a34a4fSChristoph Hellwig if (!silent) { 1248869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, 1249869f58c0SAlexey Fisher "Unrecognized mount option \"%s\" " 1250869f58c0SAlexey Fisher "or missing value", p); 125141a34a4fSChristoph Hellwig } 12521da177e4SLinus Torvalds return -EINVAL; 12531da177e4SLinus Torvalds } 12541da177e4SLinus Torvalds } 12558d44d974SOGAWA Hirofumi 12568d44d974SOGAWA Hirofumi out: 12574de151d8SAlexey Dobriyan /* UTF-8 doesn't provide FAT semantics */ 12581da177e4SLinus Torvalds if (!strcmp(opts->iocharset, "utf8")) { 1259186b5370SMihai Moldovan fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset" 12608d44d974SOGAWA Hirofumi " for FAT filesystems, filesystem will be " 1261186b5370SMihai Moldovan "case sensitive!"); 12621da177e4SLinus Torvalds } 12631da177e4SLinus Torvalds 12641ae43f82SOGAWA Hirofumi /* If user doesn't specify allow_utime, it's initialized from dmask. */ 12651ae43f82SOGAWA Hirofumi if (opts->allow_utime == (unsigned short)-1) 12661ae43f82SOGAWA Hirofumi opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); 12671da177e4SLinus Torvalds if (opts->unicode_xlate) 12681da177e4SLinus Torvalds opts->utf8 = 0; 1269ea3983acSNamjae Jeon if (opts->nfs == FAT_NFS_NOSTALE_RO) { 12702628b7a6SNamjae Jeon sb->s_flags |= MS_RDONLY; 1271ea3983acSNamjae Jeon sb->s_export_op = &fat_export_ops_nostale; 1272ea3983acSNamjae Jeon } 12731da177e4SLinus Torvalds 12741da177e4SLinus Torvalds return 0; 12751da177e4SLinus Torvalds } 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds static int fat_read_root(struct inode *inode) 12781da177e4SLinus Torvalds { 1279a40a7d9dSAlexander Kuleshov struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 12801da177e4SLinus Torvalds int error; 12811da177e4SLinus Torvalds 1282ea3983acSNamjae Jeon MSDOS_I(inode)->i_pos = MSDOS_ROOT_INO; 12831da177e4SLinus Torvalds inode->i_uid = sbi->options.fs_uid; 12841da177e4SLinus Torvalds inode->i_gid = sbi->options.fs_gid; 12851da177e4SLinus Torvalds inode->i_version++; 12861da177e4SLinus Torvalds inode->i_generation = 0; 12879c0aa1b8SOGAWA Hirofumi inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); 12881da177e4SLinus Torvalds inode->i_op = sbi->dir_ops; 12891da177e4SLinus Torvalds inode->i_fop = &fat_dir_operations; 12901da177e4SLinus Torvalds if (sbi->fat_bits == 32) { 12911da177e4SLinus Torvalds MSDOS_I(inode)->i_start = sbi->root_cluster; 12921da177e4SLinus Torvalds error = fat_calc_dir_size(inode); 12931da177e4SLinus Torvalds if (error < 0) 12941da177e4SLinus Torvalds return error; 12951da177e4SLinus Torvalds } else { 12961da177e4SLinus Torvalds MSDOS_I(inode)->i_start = 0; 12971da177e4SLinus Torvalds inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); 12981da177e4SLinus Torvalds } 12991da177e4SLinus Torvalds inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) 13001da177e4SLinus Torvalds & ~((loff_t)sbi->cluster_size - 1)) >> 9; 13011da177e4SLinus Torvalds MSDOS_I(inode)->i_logstart = 0; 13021da177e4SLinus Torvalds MSDOS_I(inode)->mmu_private = inode->i_size; 13031da177e4SLinus Torvalds 13049c0aa1b8SOGAWA Hirofumi fat_save_attrs(inode, ATTR_DIR); 13051da177e4SLinus Torvalds inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; 13061da177e4SLinus Torvalds inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; 1307bfe86848SMiklos Szeredi set_nlink(inode, fat_subdirs(inode)+2); 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds return 0; 13101da177e4SLinus Torvalds } 13111da177e4SLinus Torvalds 13127b92d03cSOGAWA Hirofumi static unsigned long calc_fat_clusters(struct super_block *sb) 13137b92d03cSOGAWA Hirofumi { 13147b92d03cSOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(sb); 13157b92d03cSOGAWA Hirofumi 13167b92d03cSOGAWA Hirofumi /* Divide first to avoid overflow */ 13177b92d03cSOGAWA Hirofumi if (sbi->fat_bits != 12) { 13187b92d03cSOGAWA Hirofumi unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits; 13197b92d03cSOGAWA Hirofumi return ent_per_sec * sbi->fat_length; 13207b92d03cSOGAWA Hirofumi } 13217b92d03cSOGAWA Hirofumi 13227b92d03cSOGAWA Hirofumi return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; 13237b92d03cSOGAWA Hirofumi } 13247b92d03cSOGAWA Hirofumi 1325190a8843SConrad Meyer static bool fat_bpb_is_zero(struct fat_boot_sector *b) 1326190a8843SConrad Meyer { 1327190a8843SConrad Meyer if (get_unaligned_le16(&b->sector_size)) 1328190a8843SConrad Meyer return false; 1329190a8843SConrad Meyer if (b->sec_per_clus) 1330190a8843SConrad Meyer return false; 1331190a8843SConrad Meyer if (b->reserved) 1332190a8843SConrad Meyer return false; 1333190a8843SConrad Meyer if (b->fats) 1334190a8843SConrad Meyer return false; 1335190a8843SConrad Meyer if (get_unaligned_le16(&b->dir_entries)) 1336190a8843SConrad Meyer return false; 1337190a8843SConrad Meyer if (get_unaligned_le16(&b->sectors)) 1338190a8843SConrad Meyer return false; 1339190a8843SConrad Meyer if (b->media) 1340190a8843SConrad Meyer return false; 1341190a8843SConrad Meyer if (b->fat_length) 1342190a8843SConrad Meyer return false; 1343190a8843SConrad Meyer if (b->secs_track) 1344190a8843SConrad Meyer return false; 1345190a8843SConrad Meyer if (b->heads) 1346190a8843SConrad Meyer return false; 1347190a8843SConrad Meyer return true; 1348190a8843SConrad Meyer } 1349190a8843SConrad Meyer 1350190a8843SConrad Meyer static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b, 1351190a8843SConrad Meyer int silent, struct fat_bios_param_block *bpb) 1352190a8843SConrad Meyer { 1353190a8843SConrad Meyer int error = -EINVAL; 1354190a8843SConrad Meyer 1355190a8843SConrad Meyer /* Read in BPB ... */ 1356190a8843SConrad Meyer memset(bpb, 0, sizeof(*bpb)); 1357190a8843SConrad Meyer bpb->fat_sector_size = get_unaligned_le16(&b->sector_size); 1358190a8843SConrad Meyer bpb->fat_sec_per_clus = b->sec_per_clus; 1359190a8843SConrad Meyer bpb->fat_reserved = le16_to_cpu(b->reserved); 1360190a8843SConrad Meyer bpb->fat_fats = b->fats; 1361190a8843SConrad Meyer bpb->fat_dir_entries = get_unaligned_le16(&b->dir_entries); 1362190a8843SConrad Meyer bpb->fat_sectors = get_unaligned_le16(&b->sectors); 1363190a8843SConrad Meyer bpb->fat_fat_length = le16_to_cpu(b->fat_length); 1364190a8843SConrad Meyer bpb->fat_total_sect = le32_to_cpu(b->total_sect); 1365190a8843SConrad Meyer 1366190a8843SConrad Meyer bpb->fat16_state = b->fat16.state; 1367190a8843SConrad Meyer bpb->fat16_vol_id = get_unaligned_le32(b->fat16.vol_id); 1368190a8843SConrad Meyer 1369190a8843SConrad Meyer bpb->fat32_length = le32_to_cpu(b->fat32.length); 1370190a8843SConrad Meyer bpb->fat32_root_cluster = le32_to_cpu(b->fat32.root_cluster); 1371190a8843SConrad Meyer bpb->fat32_info_sector = le16_to_cpu(b->fat32.info_sector); 1372190a8843SConrad Meyer bpb->fat32_state = b->fat32.state; 1373190a8843SConrad Meyer bpb->fat32_vol_id = get_unaligned_le32(b->fat32.vol_id); 1374190a8843SConrad Meyer 1375190a8843SConrad Meyer /* Validate this looks like a FAT filesystem BPB */ 1376190a8843SConrad Meyer if (!bpb->fat_reserved) { 1377190a8843SConrad Meyer if (!silent) 1378190a8843SConrad Meyer fat_msg(sb, KERN_ERR, 1379190a8843SConrad Meyer "bogus number of reserved sectors"); 1380190a8843SConrad Meyer goto out; 1381190a8843SConrad Meyer } 1382190a8843SConrad Meyer if (!bpb->fat_fats) { 1383190a8843SConrad Meyer if (!silent) 1384190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "bogus number of FAT structure"); 1385190a8843SConrad Meyer goto out; 1386190a8843SConrad Meyer } 1387190a8843SConrad Meyer 1388190a8843SConrad Meyer /* 1389190a8843SConrad Meyer * Earlier we checked here that b->secs_track and b->head are nonzero, 1390190a8843SConrad Meyer * but it turns out valid FAT filesystems can have zero there. 1391190a8843SConrad Meyer */ 1392190a8843SConrad Meyer 1393190a8843SConrad Meyer if (!fat_valid_media(b->media)) { 1394190a8843SConrad Meyer if (!silent) 1395190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)", 1396190a8843SConrad Meyer (unsigned)b->media); 1397190a8843SConrad Meyer goto out; 1398190a8843SConrad Meyer } 1399190a8843SConrad Meyer 1400190a8843SConrad Meyer if (!is_power_of_2(bpb->fat_sector_size) 1401190a8843SConrad Meyer || (bpb->fat_sector_size < 512) 1402190a8843SConrad Meyer || (bpb->fat_sector_size > 4096)) { 1403190a8843SConrad Meyer if (!silent) 1404190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "bogus logical sector size %u", 1405190a8843SConrad Meyer (unsigned)bpb->fat_sector_size); 1406190a8843SConrad Meyer goto out; 1407190a8843SConrad Meyer } 1408190a8843SConrad Meyer 1409190a8843SConrad Meyer if (!is_power_of_2(bpb->fat_sec_per_clus)) { 1410190a8843SConrad Meyer if (!silent) 1411190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u", 1412190a8843SConrad Meyer (unsigned)bpb->fat_sec_per_clus); 1413190a8843SConrad Meyer goto out; 1414190a8843SConrad Meyer } 1415190a8843SConrad Meyer 1416190a8843SConrad Meyer error = 0; 1417190a8843SConrad Meyer 1418190a8843SConrad Meyer out: 1419190a8843SConrad Meyer return error; 1420190a8843SConrad Meyer } 1421190a8843SConrad Meyer 1422190a8843SConrad Meyer static int fat_read_static_bpb(struct super_block *sb, 1423190a8843SConrad Meyer struct fat_boot_sector *b, int silent, 1424190a8843SConrad Meyer struct fat_bios_param_block *bpb) 1425190a8843SConrad Meyer { 1426190a8843SConrad Meyer static const char *notdos1x = "This doesn't look like a DOS 1.x volume"; 1427190a8843SConrad Meyer 1428190a8843SConrad Meyer struct fat_floppy_defaults *fdefaults = NULL; 1429190a8843SConrad Meyer int error = -EINVAL; 1430190a8843SConrad Meyer sector_t bd_sects; 1431190a8843SConrad Meyer unsigned i; 1432190a8843SConrad Meyer 1433190a8843SConrad Meyer bd_sects = i_size_read(sb->s_bdev->bd_inode) / SECTOR_SIZE; 1434190a8843SConrad Meyer 1435190a8843SConrad Meyer /* 16-bit DOS 1.x reliably wrote bootstrap short-jmp code */ 1436190a8843SConrad Meyer if (b->ignored[0] != 0xeb || b->ignored[2] != 0x90) { 1437190a8843SConrad Meyer if (!silent) 1438190a8843SConrad Meyer fat_msg(sb, KERN_ERR, 1439190a8843SConrad Meyer "%s; no bootstrapping code", notdos1x); 1440190a8843SConrad Meyer goto out; 1441190a8843SConrad Meyer } 1442190a8843SConrad Meyer 1443190a8843SConrad Meyer /* 1444190a8843SConrad Meyer * If any value in this region is non-zero, it isn't archaic 1445190a8843SConrad Meyer * DOS. 1446190a8843SConrad Meyer */ 1447190a8843SConrad Meyer if (!fat_bpb_is_zero(b)) { 1448190a8843SConrad Meyer if (!silent) 1449190a8843SConrad Meyer fat_msg(sb, KERN_ERR, 1450190a8843SConrad Meyer "%s; DOS 2.x BPB is non-zero", notdos1x); 1451190a8843SConrad Meyer goto out; 1452190a8843SConrad Meyer } 1453190a8843SConrad Meyer 1454190a8843SConrad Meyer for (i = 0; i < ARRAY_SIZE(floppy_defaults); i++) { 1455190a8843SConrad Meyer if (floppy_defaults[i].nr_sectors == bd_sects) { 1456190a8843SConrad Meyer fdefaults = &floppy_defaults[i]; 1457190a8843SConrad Meyer break; 1458190a8843SConrad Meyer } 1459190a8843SConrad Meyer } 1460190a8843SConrad Meyer 1461190a8843SConrad Meyer if (fdefaults == NULL) { 1462190a8843SConrad Meyer if (!silent) 1463190a8843SConrad Meyer fat_msg(sb, KERN_WARNING, 1464190a8843SConrad Meyer "This looks like a DOS 1.x volume, but isn't a recognized floppy size (%llu sectors)", 1465190a8843SConrad Meyer (u64)bd_sects); 1466190a8843SConrad Meyer goto out; 1467190a8843SConrad Meyer } 1468190a8843SConrad Meyer 1469190a8843SConrad Meyer if (!silent) 1470190a8843SConrad Meyer fat_msg(sb, KERN_INFO, 1471190a8843SConrad Meyer "This looks like a DOS 1.x volume; assuming default BPB values"); 1472190a8843SConrad Meyer 1473190a8843SConrad Meyer memset(bpb, 0, sizeof(*bpb)); 1474190a8843SConrad Meyer bpb->fat_sector_size = SECTOR_SIZE; 1475190a8843SConrad Meyer bpb->fat_sec_per_clus = fdefaults->sec_per_clus; 1476190a8843SConrad Meyer bpb->fat_reserved = 1; 1477190a8843SConrad Meyer bpb->fat_fats = 2; 1478190a8843SConrad Meyer bpb->fat_dir_entries = fdefaults->dir_entries; 1479190a8843SConrad Meyer bpb->fat_sectors = fdefaults->nr_sectors; 1480190a8843SConrad Meyer bpb->fat_fat_length = fdefaults->fat_length; 1481190a8843SConrad Meyer 1482190a8843SConrad Meyer error = 0; 1483190a8843SConrad Meyer 1484190a8843SConrad Meyer out: 1485190a8843SConrad Meyer return error; 1486190a8843SConrad Meyer } 1487190a8843SConrad Meyer 14881da177e4SLinus Torvalds /* 14891da177e4SLinus Torvalds * Read the super block of an MS-DOS FS. 14901da177e4SLinus Torvalds */ 1491384f5c96SOGAWA Hirofumi int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, 14923d23985dSAl Viro void (*setup)(struct super_block *)) 14931da177e4SLinus Torvalds { 1494b522412aSAl Viro struct inode *root_inode = NULL, *fat_inode = NULL; 1495020ac5b6SArtem Bityutskiy struct inode *fsinfo_inode = NULL; 14961da177e4SLinus Torvalds struct buffer_head *bh; 1497190a8843SConrad Meyer struct fat_bios_param_block bpb; 14981da177e4SLinus Torvalds struct msdos_sb_info *sbi; 14991da177e4SLinus Torvalds u16 logical_sector_size; 15001da177e4SLinus Torvalds u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; 15011da177e4SLinus Torvalds int debug; 15021da177e4SLinus Torvalds long error; 15031da177e4SLinus Torvalds char buf[50]; 15041da177e4SLinus Torvalds 15058f593427SLinus Torvalds /* 15068f593427SLinus Torvalds * GFP_KERNEL is ok here, because while we do hold the 15078f593427SLinus Torvalds * supeblock lock, memory pressure can't call back into 15088f593427SLinus Torvalds * the filesystem, since we're only just about to mount 15098f593427SLinus Torvalds * it and have no inodes etc active! 15108f593427SLinus Torvalds */ 1511f8314dc6SPanagiotis Issaris sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); 15121da177e4SLinus Torvalds if (!sbi) 15131da177e4SLinus Torvalds return -ENOMEM; 15141da177e4SLinus Torvalds sb->s_fs_info = sbi; 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds sb->s_flags |= MS_NODIRATIME; 15171da177e4SLinus Torvalds sb->s_magic = MSDOS_SUPER_MAGIC; 15181da177e4SLinus Torvalds sb->s_op = &fat_sops; 15191da177e4SLinus Torvalds sb->s_export_op = &fat_export_ops; 15208fceb4e0SNamjae Jeon mutex_init(&sbi->nfs_build_inode_lock); 1521aaa04b48SOGAWA Hirofumi ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1522aaa04b48SOGAWA Hirofumi DEFAULT_RATELIMIT_BURST); 15231da177e4SLinus Torvalds 1524869f58c0SAlexey Fisher error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options); 15251da177e4SLinus Torvalds if (error) 15261da177e4SLinus Torvalds goto out_fail; 15271da177e4SLinus Torvalds 15283d23985dSAl Viro setup(sb); /* flavour-specific stuff that needs options */ 15293d23985dSAl Viro 15301da177e4SLinus Torvalds error = -EIO; 15311da177e4SLinus Torvalds sb_min_blocksize(sb, 512); 15321da177e4SLinus Torvalds bh = sb_bread(sb, 0); 15331da177e4SLinus Torvalds if (bh == NULL) { 1534869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to read boot sector"); 15351da177e4SLinus Torvalds goto out_fail; 15361da177e4SLinus Torvalds } 15371da177e4SLinus Torvalds 1538190a8843SConrad Meyer error = fat_read_bpb(sb, (struct fat_boot_sector *)bh->b_data, silent, 1539190a8843SConrad Meyer &bpb); 1540190a8843SConrad Meyer if (error == -EINVAL && sbi->options.dos1xfloppy) 1541190a8843SConrad Meyer error = fat_read_static_bpb(sb, 1542190a8843SConrad Meyer (struct fat_boot_sector *)bh->b_data, silent, &bpb); 15431da177e4SLinus Torvalds brelse(bh); 15441da177e4SLinus Torvalds 1545190a8843SConrad Meyer if (error == -EINVAL) 1546190a8843SConrad Meyer goto out_invalid; 1547190a8843SConrad Meyer else if (error) 1548190a8843SConrad Meyer goto out_fail; 15491da177e4SLinus Torvalds 1550190a8843SConrad Meyer logical_sector_size = bpb.fat_sector_size; 1551190a8843SConrad Meyer sbi->sec_per_clus = bpb.fat_sec_per_clus; 15521da177e4SLinus Torvalds 1553190a8843SConrad Meyer error = -EIO; 15541da177e4SLinus Torvalds if (logical_sector_size < sb->s_blocksize) { 1555869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "logical sector size too small for device" 1556869f58c0SAlexey Fisher " (logical sector size = %u)", logical_sector_size); 15571da177e4SLinus Torvalds goto out_fail; 15581da177e4SLinus Torvalds } 1559190a8843SConrad Meyer 15601da177e4SLinus Torvalds if (logical_sector_size > sb->s_blocksize) { 1561190a8843SConrad Meyer struct buffer_head *bh_resize; 15621da177e4SLinus Torvalds 15631da177e4SLinus Torvalds if (!sb_set_blocksize(sb, logical_sector_size)) { 1564869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to set blocksize %u", 15651da177e4SLinus Torvalds logical_sector_size); 15661da177e4SLinus Torvalds goto out_fail; 15671da177e4SLinus Torvalds } 1568190a8843SConrad Meyer 1569190a8843SConrad Meyer /* Verify that the larger boot sector is fully readable */ 1570190a8843SConrad Meyer bh_resize = sb_bread(sb, 0); 1571190a8843SConrad Meyer if (bh_resize == NULL) { 1572869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to read boot sector" 1573869f58c0SAlexey Fisher " (logical sector size = %lu)", 15741da177e4SLinus Torvalds sb->s_blocksize); 15751da177e4SLinus Torvalds goto out_fail; 15761da177e4SLinus Torvalds } 1577190a8843SConrad Meyer brelse(bh_resize); 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 1580e40b34c7SMarco Stornelli mutex_init(&sbi->s_lock); 15811da177e4SLinus Torvalds sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; 15821da177e4SLinus Torvalds sbi->cluster_bits = ffs(sbi->cluster_size) - 1; 1583190a8843SConrad Meyer sbi->fats = bpb.fat_fats; 15841da177e4SLinus Torvalds sbi->fat_bits = 0; /* Don't know yet */ 1585190a8843SConrad Meyer sbi->fat_start = bpb.fat_reserved; 1586190a8843SConrad Meyer sbi->fat_length = bpb.fat_fat_length; 15871da177e4SLinus Torvalds sbi->root_cluster = 0; 15881da177e4SLinus Torvalds sbi->free_clusters = -1; /* Don't know yet */ 1589606e423eSOGAWA Hirofumi sbi->free_clus_valid = 0; 15901da177e4SLinus Torvalds sbi->prev_free = FAT_START_ENT; 1591710d4403SNamjae Jeon sb->s_maxbytes = 0xffffffff; 15921da177e4SLinus Torvalds 1593190a8843SConrad Meyer if (!sbi->fat_length && bpb.fat32_length) { 15941da177e4SLinus Torvalds struct fat_boot_fsinfo *fsinfo; 15951da177e4SLinus Torvalds struct buffer_head *fsinfo_bh; 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds /* Must be FAT32 */ 15981da177e4SLinus Torvalds sbi->fat_bits = 32; 1599190a8843SConrad Meyer sbi->fat_length = bpb.fat32_length; 1600190a8843SConrad Meyer sbi->root_cluster = bpb.fat32_root_cluster; 16011da177e4SLinus Torvalds 16021da177e4SLinus Torvalds /* MC - if info_sector is 0, don't multiply by 0 */ 1603190a8843SConrad Meyer sbi->fsinfo_sector = bpb.fat32_info_sector; 16041da177e4SLinus Torvalds if (sbi->fsinfo_sector == 0) 16051da177e4SLinus Torvalds sbi->fsinfo_sector = 1; 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); 16081da177e4SLinus Torvalds if (fsinfo_bh == NULL) { 1609869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "bread failed, FSINFO block" 1610869f58c0SAlexey Fisher " (sector = %lu)", sbi->fsinfo_sector); 16111da177e4SLinus Torvalds goto out_fail; 16121da177e4SLinus Torvalds } 16131da177e4SLinus Torvalds 16141da177e4SLinus Torvalds fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; 16151da177e4SLinus Torvalds if (!IS_FSINFO(fsinfo)) { 1616869f58c0SAlexey Fisher fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: " 1617869f58c0SAlexey Fisher "0x%08x, 0x%08x (sector = %lu)", 16181da177e4SLinus Torvalds le32_to_cpu(fsinfo->signature1), 16191da177e4SLinus Torvalds le32_to_cpu(fsinfo->signature2), 16201da177e4SLinus Torvalds sbi->fsinfo_sector); 16211da177e4SLinus Torvalds } else { 162228ec039cSOGAWA Hirofumi if (sbi->options.usefree) 1623606e423eSOGAWA Hirofumi sbi->free_clus_valid = 1; 1624606e423eSOGAWA Hirofumi sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); 16251da177e4SLinus Torvalds sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); 16261da177e4SLinus Torvalds } 16271da177e4SLinus Torvalds 16281da177e4SLinus Torvalds brelse(fsinfo_bh); 16291da177e4SLinus Torvalds } 16301da177e4SLinus Torvalds 16316e5b93eeSMike Lockwood /* interpret volume ID as a little endian 32 bit integer */ 16326e5b93eeSMike Lockwood if (sbi->fat_bits == 32) 1633190a8843SConrad Meyer sbi->vol_id = bpb.fat32_vol_id; 16346e5b93eeSMike Lockwood else /* fat 16 or 12 */ 1635190a8843SConrad Meyer sbi->vol_id = bpb.fat16_vol_id; 16366e5b93eeSMike Lockwood 16371da177e4SLinus Torvalds sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); 16381da177e4SLinus Torvalds sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; 1641190a8843SConrad Meyer sbi->dir_entries = bpb.fat_dir_entries; 16421da177e4SLinus Torvalds if (sbi->dir_entries & (sbi->dir_per_block - 1)) { 16431da177e4SLinus Torvalds if (!silent) 1644c39540c6SRavishankar N fat_msg(sb, KERN_ERR, "bogus directory-entries per block" 1645869f58c0SAlexey Fisher " (%u)", sbi->dir_entries); 16461da177e4SLinus Torvalds goto out_invalid; 16471da177e4SLinus Torvalds } 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds rootdir_sectors = sbi->dir_entries 16501da177e4SLinus Torvalds * sizeof(struct msdos_dir_entry) / sb->s_blocksize; 16511da177e4SLinus Torvalds sbi->data_start = sbi->dir_start + rootdir_sectors; 1652190a8843SConrad Meyer total_sectors = bpb.fat_sectors; 16531da177e4SLinus Torvalds if (total_sectors == 0) 1654190a8843SConrad Meyer total_sectors = bpb.fat_total_sect; 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; 16571da177e4SLinus Torvalds 16581da177e4SLinus Torvalds if (sbi->fat_bits != 32) 16591da177e4SLinus Torvalds sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; 16601da177e4SLinus Torvalds 1661b88a1058SOleksij Rempel /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */ 1662b88a1058SOleksij Rempel if (sbi->fat_bits == 32) 1663190a8843SConrad Meyer sbi->dirty = bpb.fat32_state & FAT_STATE_DIRTY; 1664b88a1058SOleksij Rempel else /* fat 16 or 12 */ 1665190a8843SConrad Meyer sbi->dirty = bpb.fat16_state & FAT_STATE_DIRTY; 1666b88a1058SOleksij Rempel 16671da177e4SLinus Torvalds /* check that FAT table does not overflow */ 16687b92d03cSOGAWA Hirofumi fat_clusters = calc_fat_clusters(sb); 16691da177e4SLinus Torvalds total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); 16701da177e4SLinus Torvalds if (total_clusters > MAX_FAT(sb)) { 16711da177e4SLinus Torvalds if (!silent) 1672869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "count of clusters too big (%u)", 16731da177e4SLinus Torvalds total_clusters); 16741da177e4SLinus Torvalds goto out_invalid; 16751da177e4SLinus Torvalds } 16761da177e4SLinus Torvalds 16771da177e4SLinus Torvalds sbi->max_cluster = total_clusters + FAT_START_ENT; 16781da177e4SLinus Torvalds /* check the free_clusters, it's not necessarily correct */ 16791da177e4SLinus Torvalds if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) 16801da177e4SLinus Torvalds sbi->free_clusters = -1; 16811da177e4SLinus Torvalds /* check the prev_free, it's not necessarily correct */ 16821da177e4SLinus Torvalds sbi->prev_free %= sbi->max_cluster; 16831da177e4SLinus Torvalds if (sbi->prev_free < FAT_START_ENT) 16841da177e4SLinus Torvalds sbi->prev_free = FAT_START_ENT; 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds /* set up enough so that it can read an inode */ 16871da177e4SLinus Torvalds fat_hash_init(sb); 16887669e8fbSSteven J. Magnani dir_hash_init(sb); 16891da177e4SLinus Torvalds fat_ent_access_init(sb); 16901da177e4SLinus Torvalds 16911da177e4SLinus Torvalds /* 16921da177e4SLinus Torvalds * The low byte of FAT's first entry must have same value with 16931da177e4SLinus Torvalds * media-field. But in real world, too many devices is 16941da177e4SLinus Torvalds * writing wrong value. So, removed that validity check. 16951da177e4SLinus Torvalds * 16961da177e4SLinus Torvalds * if (FAT_FIRST_ENT(sb, media) != first) 16971da177e4SLinus Torvalds */ 16981da177e4SLinus Torvalds 16991da177e4SLinus Torvalds error = -EINVAL; 17001da177e4SLinus Torvalds sprintf(buf, "cp%d", sbi->options.codepage); 17011da177e4SLinus Torvalds sbi->nls_disk = load_nls(buf); 17021da177e4SLinus Torvalds if (!sbi->nls_disk) { 1703869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "codepage %s not found", buf); 17041da177e4SLinus Torvalds goto out_fail; 17051da177e4SLinus Torvalds } 17061da177e4SLinus Torvalds 17071da177e4SLinus Torvalds /* FIXME: utf8 is using iocharset for upper/lower conversion */ 17081da177e4SLinus Torvalds if (sbi->options.isvfat) { 17091da177e4SLinus Torvalds sbi->nls_io = load_nls(sbi->options.iocharset); 17101da177e4SLinus Torvalds if (!sbi->nls_io) { 1711869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "IO charset %s not found", 17121da177e4SLinus Torvalds sbi->options.iocharset); 17131da177e4SLinus Torvalds goto out_fail; 17141da177e4SLinus Torvalds } 17151da177e4SLinus Torvalds } 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds error = -ENOMEM; 1718b522412aSAl Viro fat_inode = new_inode(sb); 1719b522412aSAl Viro if (!fat_inode) 1720b522412aSAl Viro goto out_fail; 1721b522412aSAl Viro MSDOS_I(fat_inode)->i_pos = 0; 1722b522412aSAl Viro sbi->fat_inode = fat_inode; 1723020ac5b6SArtem Bityutskiy 1724020ac5b6SArtem Bityutskiy fsinfo_inode = new_inode(sb); 1725020ac5b6SArtem Bityutskiy if (!fsinfo_inode) 1726020ac5b6SArtem Bityutskiy goto out_fail; 1727020ac5b6SArtem Bityutskiy fsinfo_inode->i_ino = MSDOS_FSINFO_INO; 1728020ac5b6SArtem Bityutskiy sbi->fsinfo_inode = fsinfo_inode; 1729020ac5b6SArtem Bityutskiy insert_inode_hash(fsinfo_inode); 1730020ac5b6SArtem Bityutskiy 17311da177e4SLinus Torvalds root_inode = new_inode(sb); 17321da177e4SLinus Torvalds if (!root_inode) 17331da177e4SLinus Torvalds goto out_fail; 17341da177e4SLinus Torvalds root_inode->i_ino = MSDOS_ROOT_INO; 17351da177e4SLinus Torvalds root_inode->i_version = 1; 17361da177e4SLinus Torvalds error = fat_read_root(root_inode); 17371688f860SAl Viro if (error < 0) { 17381688f860SAl Viro iput(root_inode); 17391da177e4SLinus Torvalds goto out_fail; 17401688f860SAl Viro } 17411da177e4SLinus Torvalds error = -ENOMEM; 17421da177e4SLinus Torvalds insert_inode_hash(root_inode); 17437669e8fbSSteven J. Magnani fat_attach(root_inode, 0); 17441688f860SAl Viro sb->s_root = d_make_root(root_inode); 17451da177e4SLinus Torvalds if (!sb->s_root) { 1746869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "get root inode failed"); 17471da177e4SLinus Torvalds goto out_fail; 17481da177e4SLinus Torvalds } 17491da177e4SLinus Torvalds 1750f562146aSNamjae Jeon if (sbi->options.discard) { 1751f562146aSNamjae Jeon struct request_queue *q = bdev_get_queue(sb->s_bdev); 1752f562146aSNamjae Jeon if (!blk_queue_discard(q)) 1753f562146aSNamjae Jeon fat_msg(sb, KERN_WARNING, 1754f562146aSNamjae Jeon "mounting with \"discard\" option, but " 1755f562146aSNamjae Jeon "the device does not support discard"); 1756f562146aSNamjae Jeon } 1757f562146aSNamjae Jeon 1758b88a1058SOleksij Rempel fat_set_state(sb, 1, 0); 17591da177e4SLinus Torvalds return 0; 17601da177e4SLinus Torvalds 17611da177e4SLinus Torvalds out_invalid: 17621da177e4SLinus Torvalds error = -EINVAL; 17631da177e4SLinus Torvalds if (!silent) 1764869f58c0SAlexey Fisher fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); 17651da177e4SLinus Torvalds 17661da177e4SLinus Torvalds out_fail: 1767020ac5b6SArtem Bityutskiy if (fsinfo_inode) 1768020ac5b6SArtem Bityutskiy iput(fsinfo_inode); 1769b522412aSAl Viro if (fat_inode) 1770b522412aSAl Viro iput(fat_inode); 17711da177e4SLinus Torvalds unload_nls(sbi->nls_io); 17721da177e4SLinus Torvalds unload_nls(sbi->nls_disk); 17731da177e4SLinus Torvalds if (sbi->options.iocharset != fat_default_iocharset) 17741da177e4SLinus Torvalds kfree(sbi->options.iocharset); 17751da177e4SLinus Torvalds sb->s_fs_info = NULL; 17761da177e4SLinus Torvalds kfree(sbi); 17771da177e4SLinus Torvalds return error; 17781da177e4SLinus Torvalds } 17791da177e4SLinus Torvalds 17807c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_fill_super); 17811da177e4SLinus Torvalds 1782ae78bf9cSChris Mason /* 1783ae78bf9cSChris Mason * helper function for fat_flush_inodes. This writes both the inode 1784ae78bf9cSChris Mason * and the file data blocks, waiting for in flight data blocks before 1785ae78bf9cSChris Mason * the start of the call. It does not wait for any io started 1786ae78bf9cSChris Mason * during the call 1787ae78bf9cSChris Mason */ 1788ae78bf9cSChris Mason static int writeback_inode(struct inode *inode) 1789ae78bf9cSChris Mason { 1790ae78bf9cSChris Mason 1791ae78bf9cSChris Mason int ret; 179214864655SNamjae Jeon 179314864655SNamjae Jeon /* if we used wait=1, sync_inode_metadata waits for the io for the 179414864655SNamjae Jeon * inode to finish. So wait=0 is sent down to sync_inode_metadata 1795ae78bf9cSChris Mason * and filemap_fdatawrite is used for the data blocks 1796ae78bf9cSChris Mason */ 179714864655SNamjae Jeon ret = sync_inode_metadata(inode, 0); 1798ae78bf9cSChris Mason if (!ret) 179914864655SNamjae Jeon ret = filemap_fdatawrite(inode->i_mapping); 1800ae78bf9cSChris Mason return ret; 1801ae78bf9cSChris Mason } 1802ae78bf9cSChris Mason 1803ae78bf9cSChris Mason /* 1804ae78bf9cSChris Mason * write data and metadata corresponding to i1 and i2. The io is 1805ae78bf9cSChris Mason * started but we do not wait for any of it to finish. 1806ae78bf9cSChris Mason * 1807ae78bf9cSChris Mason * filemap_flush is used for the block device, so if there is a dirty 1808ae78bf9cSChris Mason * page for a block already in flight, we will not wait and start the 1809ae78bf9cSChris Mason * io over again 1810ae78bf9cSChris Mason */ 1811ae78bf9cSChris Mason int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) 1812ae78bf9cSChris Mason { 1813ae78bf9cSChris Mason int ret = 0; 1814ae78bf9cSChris Mason if (!MSDOS_SB(sb)->options.flush) 1815ae78bf9cSChris Mason return 0; 1816ae78bf9cSChris Mason if (i1) 1817ae78bf9cSChris Mason ret = writeback_inode(i1); 1818ae78bf9cSChris Mason if (!ret && i2) 1819ae78bf9cSChris Mason ret = writeback_inode(i2); 182097e860d3SEric Sesterhenn if (!ret) { 1821ae78bf9cSChris Mason struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; 1822ae78bf9cSChris Mason ret = filemap_flush(mapping); 1823ae78bf9cSChris Mason } 1824ae78bf9cSChris Mason return ret; 1825ae78bf9cSChris Mason } 1826ae78bf9cSChris Mason EXPORT_SYMBOL_GPL(fat_flush_inodes); 1827ae78bf9cSChris Mason 18281da177e4SLinus Torvalds static int __init init_fat_fs(void) 18291da177e4SLinus Torvalds { 1830532a39a3SPekka J Enberg int err; 18311da177e4SLinus Torvalds 1832532a39a3SPekka J Enberg err = fat_cache_init(); 1833532a39a3SPekka J Enberg if (err) 1834532a39a3SPekka J Enberg return err; 1835532a39a3SPekka J Enberg 1836532a39a3SPekka J Enberg err = fat_init_inodecache(); 1837532a39a3SPekka J Enberg if (err) 1838532a39a3SPekka J Enberg goto failed; 1839532a39a3SPekka J Enberg 1840532a39a3SPekka J Enberg return 0; 1841532a39a3SPekka J Enberg 1842532a39a3SPekka J Enberg failed: 1843532a39a3SPekka J Enberg fat_cache_destroy(); 1844532a39a3SPekka J Enberg return err; 18451da177e4SLinus Torvalds } 18461da177e4SLinus Torvalds 18471da177e4SLinus Torvalds static void __exit exit_fat_fs(void) 18481da177e4SLinus Torvalds { 18491da177e4SLinus Torvalds fat_cache_destroy(); 18501da177e4SLinus Torvalds fat_destroy_inodecache(); 18511da177e4SLinus Torvalds } 18521da177e4SLinus Torvalds 18531da177e4SLinus Torvalds module_init(init_fat_fs) 18541da177e4SLinus Torvalds module_exit(exit_fat_fs) 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1857