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> 232489dbabSJeff Layton #include <linux/iversion.h> 249e975daeSOGAWA Hirofumi #include "fat.h" 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #ifndef CONFIG_FAT_DEFAULT_IOCHARSET 271da177e4SLinus Torvalds /* if user don't select VFAT, this is undefined. */ 281da177e4SLinus Torvalds #define CONFIG_FAT_DEFAULT_IOCHARSET "" 291da177e4SLinus Torvalds #endif 301da177e4SLinus Torvalds 31190a8843SConrad Meyer #define KB_IN_SECTORS 2 32190a8843SConrad Meyer 33190a8843SConrad Meyer /* 34190a8843SConrad Meyer * A deserialized copy of the on-disk structure laid out in struct 35190a8843SConrad Meyer * fat_boot_sector. 36190a8843SConrad Meyer */ 37190a8843SConrad Meyer struct fat_bios_param_block { 38190a8843SConrad Meyer u16 fat_sector_size; 39190a8843SConrad Meyer u8 fat_sec_per_clus; 40190a8843SConrad Meyer u16 fat_reserved; 41190a8843SConrad Meyer u8 fat_fats; 42190a8843SConrad Meyer u16 fat_dir_entries; 43190a8843SConrad Meyer u16 fat_sectors; 44190a8843SConrad Meyer u16 fat_fat_length; 45190a8843SConrad Meyer u32 fat_total_sect; 46190a8843SConrad Meyer 47190a8843SConrad Meyer u8 fat16_state; 48190a8843SConrad Meyer u32 fat16_vol_id; 49190a8843SConrad Meyer 50190a8843SConrad Meyer u32 fat32_length; 51190a8843SConrad Meyer u32 fat32_root_cluster; 52190a8843SConrad Meyer u16 fat32_info_sector; 53190a8843SConrad Meyer u8 fat32_state; 54190a8843SConrad Meyer u32 fat32_vol_id; 55190a8843SConrad Meyer }; 56190a8843SConrad Meyer 571da177e4SLinus Torvalds static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE; 581da177e4SLinus Torvalds static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET; 591da177e4SLinus Torvalds 60190a8843SConrad Meyer static struct fat_floppy_defaults { 61190a8843SConrad Meyer unsigned nr_sectors; 62190a8843SConrad Meyer unsigned sec_per_clus; 63190a8843SConrad Meyer unsigned dir_entries; 64190a8843SConrad Meyer unsigned media; 65190a8843SConrad Meyer unsigned fat_length; 66190a8843SConrad Meyer } floppy_defaults[] = { 67190a8843SConrad Meyer { 68190a8843SConrad Meyer .nr_sectors = 160 * KB_IN_SECTORS, 69190a8843SConrad Meyer .sec_per_clus = 1, 70190a8843SConrad Meyer .dir_entries = 64, 71190a8843SConrad Meyer .media = 0xFE, 72190a8843SConrad Meyer .fat_length = 1, 73190a8843SConrad Meyer }, 74190a8843SConrad Meyer { 75190a8843SConrad Meyer .nr_sectors = 180 * KB_IN_SECTORS, 76190a8843SConrad Meyer .sec_per_clus = 1, 77190a8843SConrad Meyer .dir_entries = 64, 78190a8843SConrad Meyer .media = 0xFC, 79190a8843SConrad Meyer .fat_length = 2, 80190a8843SConrad Meyer }, 81190a8843SConrad Meyer { 82190a8843SConrad Meyer .nr_sectors = 320 * KB_IN_SECTORS, 83190a8843SConrad Meyer .sec_per_clus = 2, 84190a8843SConrad Meyer .dir_entries = 112, 85190a8843SConrad Meyer .media = 0xFF, 86190a8843SConrad Meyer .fat_length = 1, 87190a8843SConrad Meyer }, 88190a8843SConrad Meyer { 89190a8843SConrad Meyer .nr_sectors = 360 * KB_IN_SECTORS, 90190a8843SConrad Meyer .sec_per_clus = 2, 91190a8843SConrad Meyer .dir_entries = 112, 92190a8843SConrad Meyer .media = 0xFD, 93190a8843SConrad Meyer .fat_length = 2, 94190a8843SConrad Meyer }, 95190a8843SConrad Meyer }; 961da177e4SLinus Torvalds 97b13bb33eSNamjae Jeon int fat_add_cluster(struct inode *inode) 981da177e4SLinus Torvalds { 991da177e4SLinus Torvalds int err, cluster; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds err = fat_alloc_clusters(inode, &cluster, 1); 1021da177e4SLinus Torvalds if (err) 1031da177e4SLinus Torvalds return err; 1041da177e4SLinus Torvalds /* FIXME: this cluster should be added after data of this 1051da177e4SLinus Torvalds * cluster is writed */ 1061da177e4SLinus Torvalds err = fat_chain_add(inode, cluster, 1); 1071da177e4SLinus Torvalds if (err) 1081da177e4SLinus Torvalds fat_free_clusters(inode, cluster); 1091da177e4SLinus Torvalds return err; 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1126a1d9805SOGAWA Hirofumi static inline int __fat_get_block(struct inode *inode, sector_t iblock, 113e5174baaSOGAWA Hirofumi unsigned long *max_blocks, 1141da177e4SLinus Torvalds struct buffer_head *bh_result, int create) 1151da177e4SLinus Torvalds { 1161da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 117e5174baaSOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(sb); 118e5174baaSOGAWA Hirofumi unsigned long mapped_blocks; 1197e0f236bSNamjae Jeon sector_t phys, last_block; 120e5174baaSOGAWA Hirofumi int err, offset; 1211da177e4SLinus Torvalds 12216fab201SNamjae Jeon err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create, false); 1231da177e4SLinus Torvalds if (err) 1241da177e4SLinus Torvalds return err; 1251da177e4SLinus Torvalds if (phys) { 1261da177e4SLinus Torvalds map_bh(bh_result, sb, phys); 127e5174baaSOGAWA Hirofumi *max_blocks = min(mapped_blocks, *max_blocks); 1281da177e4SLinus Torvalds return 0; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds if (!create) 1311da177e4SLinus Torvalds return 0; 132e5174baaSOGAWA Hirofumi 1331da177e4SLinus Torvalds if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) { 13485c78591SDenis Karpov fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)", 1351da177e4SLinus Torvalds MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private); 1361da177e4SLinus Torvalds return -EIO; 1371da177e4SLinus Torvalds } 138e5174baaSOGAWA Hirofumi 1397e0f236bSNamjae Jeon last_block = inode->i_blocks >> (sb->s_blocksize_bits - 9); 140e5174baaSOGAWA Hirofumi offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); 1417e0f236bSNamjae Jeon /* 1427e0f236bSNamjae Jeon * allocate a cluster according to the following. 1437e0f236bSNamjae Jeon * 1) no more available blocks 1447e0f236bSNamjae Jeon * 2) not part of fallocate region 1457e0f236bSNamjae Jeon */ 1467e0f236bSNamjae Jeon if (!offset && !(iblock < last_block)) { 147e5174baaSOGAWA Hirofumi /* TODO: multiple cluster allocation would be desirable. */ 1481da177e4SLinus Torvalds err = fat_add_cluster(inode); 1491da177e4SLinus Torvalds if (err) 1501da177e4SLinus Torvalds return err; 1511da177e4SLinus Torvalds } 152e5174baaSOGAWA Hirofumi /* available blocks on this cluster */ 153e5174baaSOGAWA Hirofumi mapped_blocks = sbi->sec_per_clus - offset; 154e5174baaSOGAWA Hirofumi 155e5174baaSOGAWA Hirofumi *max_blocks = min(mapped_blocks, *max_blocks); 156e5174baaSOGAWA Hirofumi MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; 157e5174baaSOGAWA Hirofumi 15816fab201SNamjae Jeon err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create, false); 1591da177e4SLinus Torvalds if (err) 1601da177e4SLinus Torvalds return err; 161c2574aaaSOGAWA Hirofumi if (!phys) { 162c2574aaaSOGAWA Hirofumi fat_fs_error(sb, 163c2574aaaSOGAWA Hirofumi "invalid FAT chain (i_pos %lld, last_block %llu)", 164c2574aaaSOGAWA Hirofumi MSDOS_I(inode)->i_pos, 165c2574aaaSOGAWA Hirofumi (unsigned long long)last_block); 166c2574aaaSOGAWA Hirofumi return -EIO; 167c2574aaaSOGAWA Hirofumi } 1686a1d9805SOGAWA Hirofumi 169e5174baaSOGAWA Hirofumi BUG_ON(*max_blocks != mapped_blocks); 1701da177e4SLinus Torvalds set_buffer_new(bh_result); 1711da177e4SLinus Torvalds map_bh(bh_result, sb, phys); 1721da177e4SLinus Torvalds 173e5174baaSOGAWA Hirofumi return 0; 174e5174baaSOGAWA Hirofumi } 175e5174baaSOGAWA Hirofumi 176e5174baaSOGAWA Hirofumi static int fat_get_block(struct inode *inode, sector_t iblock, 177e5174baaSOGAWA Hirofumi struct buffer_head *bh_result, int create) 178e5174baaSOGAWA Hirofumi { 1796a1d9805SOGAWA Hirofumi struct super_block *sb = inode->i_sb; 1806a1d9805SOGAWA Hirofumi unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; 1816a1d9805SOGAWA Hirofumi int err; 1826a1d9805SOGAWA Hirofumi 1836a1d9805SOGAWA Hirofumi err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create); 1846a1d9805SOGAWA Hirofumi if (err) 1856a1d9805SOGAWA Hirofumi return err; 1866a1d9805SOGAWA Hirofumi bh_result->b_size = max_blocks << sb->s_blocksize_bits; 1876a1d9805SOGAWA Hirofumi return 0; 188e5174baaSOGAWA Hirofumi } 189e5174baaSOGAWA Hirofumi 1901da177e4SLinus Torvalds static int fat_writepage(struct page *page, struct writeback_control *wbc) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds return block_write_full_page(page, fat_get_block, wbc); 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 195a5425d29SOGAWA Hirofumi static int fat_writepages(struct address_space *mapping, 196a5425d29SOGAWA Hirofumi struct writeback_control *wbc) 197a5425d29SOGAWA Hirofumi { 198a5425d29SOGAWA Hirofumi return mpage_writepages(mapping, wbc, fat_get_block); 199a5425d29SOGAWA Hirofumi } 200a5425d29SOGAWA Hirofumi 2011da177e4SLinus Torvalds static int fat_readpage(struct file *file, struct page *page) 2021da177e4SLinus Torvalds { 203a5425d29SOGAWA Hirofumi return mpage_readpage(page, fat_get_block); 204a5425d29SOGAWA Hirofumi } 205a5425d29SOGAWA Hirofumi 206a5425d29SOGAWA Hirofumi static int fat_readpages(struct file *file, struct address_space *mapping, 207a5425d29SOGAWA Hirofumi struct list_head *pages, unsigned nr_pages) 208a5425d29SOGAWA Hirofumi { 209a5425d29SOGAWA Hirofumi return mpage_readpages(mapping, pages, nr_pages, fat_get_block); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 212459f6ed3Snpiggin@suse.de static void fat_write_failed(struct address_space *mapping, loff_t to) 213459f6ed3Snpiggin@suse.de { 214459f6ed3Snpiggin@suse.de struct inode *inode = mapping->host; 215459f6ed3Snpiggin@suse.de 216459f6ed3Snpiggin@suse.de if (to > inode->i_size) { 2177caef267SKirill A. Shutemov truncate_pagecache(inode, inode->i_size); 218459f6ed3Snpiggin@suse.de fat_truncate_blocks(inode, inode->i_size); 219459f6ed3Snpiggin@suse.de } 220459f6ed3Snpiggin@suse.de } 221459f6ed3Snpiggin@suse.de 222d7777a25SNick Piggin static int fat_write_begin(struct file *file, struct address_space *mapping, 223d7777a25SNick Piggin loff_t pos, unsigned len, unsigned flags, 224d7777a25SNick Piggin struct page **pagep, void **fsdata) 2251da177e4SLinus Torvalds { 226459f6ed3Snpiggin@suse.de int err; 227459f6ed3Snpiggin@suse.de 228d7777a25SNick Piggin *pagep = NULL; 229282dc178SChristoph Hellwig err = cont_write_begin(file, mapping, pos, len, flags, 230459f6ed3Snpiggin@suse.de pagep, fsdata, fat_get_block, 231d7777a25SNick Piggin &MSDOS_I(mapping->host)->mmu_private); 232459f6ed3Snpiggin@suse.de if (err < 0) 233459f6ed3Snpiggin@suse.de fat_write_failed(mapping, pos + len); 234459f6ed3Snpiggin@suse.de return err; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 237d7777a25SNick Piggin static int fat_write_end(struct file *file, struct address_space *mapping, 238d7777a25SNick Piggin loff_t pos, unsigned len, unsigned copied, 239d7777a25SNick Piggin struct page *pagep, void *fsdata) 240ef402268SOGAWA Hirofumi { 241d7777a25SNick Piggin struct inode *inode = mapping->host; 242d7777a25SNick Piggin int err; 243d7777a25SNick Piggin err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); 244459f6ed3Snpiggin@suse.de if (err < len) 245459f6ed3Snpiggin@suse.de fat_write_failed(mapping, pos + len); 246d7777a25SNick Piggin if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) { 247cd83f6b1SFrank Sorenson fat_truncate_time(inode, NULL, S_CTIME|S_MTIME); 248ef402268SOGAWA Hirofumi MSDOS_I(inode)->i_attrs |= ATTR_ARCH; 249ef402268SOGAWA Hirofumi mark_inode_dirty(inode); 250ef402268SOGAWA Hirofumi } 251ef402268SOGAWA Hirofumi return err; 252ef402268SOGAWA Hirofumi } 253ef402268SOGAWA Hirofumi 254c8b8e32dSChristoph Hellwig static ssize_t fat_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 255e5174baaSOGAWA Hirofumi { 256e5174baaSOGAWA Hirofumi struct file *file = iocb->ki_filp; 257459f6ed3Snpiggin@suse.de struct address_space *mapping = file->f_mapping; 258459f6ed3Snpiggin@suse.de struct inode *inode = mapping->host; 259a6cbcd4aSAl Viro size_t count = iov_iter_count(iter); 260c8b8e32dSChristoph Hellwig loff_t offset = iocb->ki_pos; 261459f6ed3Snpiggin@suse.de ssize_t ret; 262e5174baaSOGAWA Hirofumi 2636f673763SOmar Sandoval if (iov_iter_rw(iter) == WRITE) { 264e5174baaSOGAWA Hirofumi /* 2654e02ed4bSNick Piggin * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), 266e5174baaSOGAWA Hirofumi * so we need to update the ->mmu_private to block boundary. 267e5174baaSOGAWA Hirofumi * 268e5174baaSOGAWA Hirofumi * But we must fill the remaining area or hole by nul for 269e5174baaSOGAWA Hirofumi * updating ->mmu_private. 27094412a96SOGAWA Hirofumi * 27194412a96SOGAWA Hirofumi * Return 0, and fallback to normal buffered write. 272e5174baaSOGAWA Hirofumi */ 273a6cbcd4aSAl Viro loff_t size = offset + count; 274e5174baaSOGAWA Hirofumi if (MSDOS_I(inode)->mmu_private < size) 27594412a96SOGAWA Hirofumi return 0; 276e5174baaSOGAWA Hirofumi } 277e5174baaSOGAWA Hirofumi 278e5174baaSOGAWA Hirofumi /* 279e5174baaSOGAWA Hirofumi * FAT need to use the DIO_LOCKING for avoiding the race 280e5174baaSOGAWA Hirofumi * condition of fat_get_block() and ->truncate(). 281e5174baaSOGAWA Hirofumi */ 282c8b8e32dSChristoph Hellwig ret = blockdev_direct_IO(iocb, inode, iter, fat_get_block); 2836f673763SOmar Sandoval if (ret < 0 && iov_iter_rw(iter) == WRITE) 284a6cbcd4aSAl Viro fat_write_failed(mapping, offset + count); 285459f6ed3Snpiggin@suse.de 286459f6ed3Snpiggin@suse.de return ret; 287e5174baaSOGAWA Hirofumi } 288e5174baaSOGAWA Hirofumi 28916fab201SNamjae Jeon static int fat_get_block_bmap(struct inode *inode, sector_t iblock, 29016fab201SNamjae Jeon struct buffer_head *bh_result, int create) 29116fab201SNamjae Jeon { 29216fab201SNamjae Jeon struct super_block *sb = inode->i_sb; 29316fab201SNamjae Jeon unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; 29416fab201SNamjae Jeon int err; 29516fab201SNamjae Jeon sector_t bmap; 29616fab201SNamjae Jeon unsigned long mapped_blocks; 29716fab201SNamjae Jeon 29816fab201SNamjae Jeon BUG_ON(create != 0); 29916fab201SNamjae Jeon 30016fab201SNamjae Jeon err = fat_bmap(inode, iblock, &bmap, &mapped_blocks, create, true); 30116fab201SNamjae Jeon if (err) 30216fab201SNamjae Jeon return err; 30316fab201SNamjae Jeon 30416fab201SNamjae Jeon if (bmap) { 30516fab201SNamjae Jeon map_bh(bh_result, sb, bmap); 30616fab201SNamjae Jeon max_blocks = min(mapped_blocks, max_blocks); 30716fab201SNamjae Jeon } 30816fab201SNamjae Jeon 30916fab201SNamjae Jeon bh_result->b_size = max_blocks << sb->s_blocksize_bits; 31016fab201SNamjae Jeon 31116fab201SNamjae Jeon return 0; 31216fab201SNamjae Jeon } 31316fab201SNamjae Jeon 3141da177e4SLinus Torvalds static sector_t _fat_bmap(struct address_space *mapping, sector_t block) 3151da177e4SLinus Torvalds { 316fa93ca18SOGAWA Hirofumi sector_t blocknr; 317fa93ca18SOGAWA Hirofumi 318fa93ca18SOGAWA Hirofumi /* fat_get_cluster() assumes the requested blocknr isn't truncated. */ 31958268691SChristoph Hellwig down_read(&MSDOS_I(mapping->host)->truncate_lock); 32016fab201SNamjae Jeon blocknr = generic_block_bmap(mapping, block, fat_get_block_bmap); 32158268691SChristoph Hellwig up_read(&MSDOS_I(mapping->host)->truncate_lock); 322fa93ca18SOGAWA Hirofumi 323fa93ca18SOGAWA Hirofumi return blocknr; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 326c0ef0cc9SNamjae Jeon /* 327c0ef0cc9SNamjae Jeon * fat_block_truncate_page() zeroes out a mapping from file offset `from' 328c0ef0cc9SNamjae Jeon * up to the end of the block which corresponds to `from'. 329c0ef0cc9SNamjae Jeon * This is required during truncate to physically zeroout the tail end 330c0ef0cc9SNamjae Jeon * of that block so it doesn't yield old data if the file is later grown. 331c0ef0cc9SNamjae Jeon * Also, avoid causing failure from fsx for cases of "data past EOF" 332c0ef0cc9SNamjae Jeon */ 333c0ef0cc9SNamjae Jeon int fat_block_truncate_page(struct inode *inode, loff_t from) 334c0ef0cc9SNamjae Jeon { 335c0ef0cc9SNamjae Jeon return block_truncate_page(inode->i_mapping, from, fat_get_block); 336c0ef0cc9SNamjae Jeon } 337c0ef0cc9SNamjae Jeon 338f5e54d6eSChristoph Hellwig static const struct address_space_operations fat_aops = { 3391da177e4SLinus Torvalds .readpage = fat_readpage, 340a5425d29SOGAWA Hirofumi .readpages = fat_readpages, 3411da177e4SLinus Torvalds .writepage = fat_writepage, 342a5425d29SOGAWA Hirofumi .writepages = fat_writepages, 343d7777a25SNick Piggin .write_begin = fat_write_begin, 344d7777a25SNick Piggin .write_end = fat_write_end, 345e5174baaSOGAWA Hirofumi .direct_IO = fat_direct_IO, 3461da177e4SLinus Torvalds .bmap = _fat_bmap 3471da177e4SLinus Torvalds }; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* 3501da177e4SLinus Torvalds * New FAT inode stuff. We do the following: 3511da177e4SLinus Torvalds * a) i_ino is constant and has nothing with on-disk location. 3521da177e4SLinus Torvalds * b) FAT manages its own cache of directory entries. 3531da177e4SLinus Torvalds * c) *This* cache is indexed by on-disk location. 3541da177e4SLinus Torvalds * d) inode has an associated directory entry, all right, but 3551da177e4SLinus Torvalds * it may be unhashed. 3561da177e4SLinus Torvalds * e) currently entries are stored within struct inode. That should 3571da177e4SLinus Torvalds * change. 3581da177e4SLinus Torvalds * f) we deal with races in the following way: 3591da177e4SLinus Torvalds * 1. readdir() and lookup() do FAT-dir-cache lookup. 3601da177e4SLinus Torvalds * 2. rename() unhashes the F-d-c entry and rehashes it in 3611da177e4SLinus Torvalds * a new place. 3621da177e4SLinus Torvalds * 3. unlink() and rmdir() unhash F-d-c entry. 3631da177e4SLinus Torvalds * 4. fat_write_inode() checks whether the thing is unhashed. 3641da177e4SLinus Torvalds * If it is we silently return. If it isn't we do bread(), 3651da177e4SLinus Torvalds * check if the location is still valid and retry if it 3661da177e4SLinus Torvalds * isn't. Otherwise we do changes. 3671da177e4SLinus Torvalds * 5. Spinlock is used to protect hash/unhash/location check/lookup 368deee3ce4SAl Viro * 6. fat_evict_inode() unhashes the F-d-c entry. 3691da177e4SLinus Torvalds * 7. lookup() and readdir() do igrab() if they find a F-d-c entry 3701da177e4SLinus Torvalds * and consider negative result as cache miss. 3711da177e4SLinus Torvalds */ 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds static void fat_hash_init(struct super_block *sb) 3741da177e4SLinus Torvalds { 3751da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 3761da177e4SLinus Torvalds int i; 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds spin_lock_init(&sbi->inode_hash_lock); 3791da177e4SLinus Torvalds for (i = 0; i < FAT_HASH_SIZE; i++) 3801da177e4SLinus Torvalds INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 383d3dfa822SOGAWA Hirofumi static inline unsigned long fat_hash(loff_t i_pos) 3841da177e4SLinus Torvalds { 385d3dfa822SOGAWA Hirofumi return hash_32(i_pos, FAT_HASH_BITS); 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 3887669e8fbSSteven J. Magnani static void dir_hash_init(struct super_block *sb) 3897669e8fbSSteven J. Magnani { 3907669e8fbSSteven J. Magnani struct msdos_sb_info *sbi = MSDOS_SB(sb); 3917669e8fbSSteven J. Magnani int i; 3927669e8fbSSteven J. Magnani 3937669e8fbSSteven J. Magnani spin_lock_init(&sbi->dir_hash_lock); 3947669e8fbSSteven J. Magnani for (i = 0; i < FAT_HASH_SIZE; i++) 3957669e8fbSSteven J. Magnani INIT_HLIST_HEAD(&sbi->dir_hashtable[i]); 3967669e8fbSSteven J. Magnani } 3977669e8fbSSteven J. Magnani 3981da177e4SLinus Torvalds void fat_attach(struct inode *inode, loff_t i_pos) 3991da177e4SLinus Torvalds { 400d3dfa822SOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 4017669e8fbSSteven J. Magnani 4027669e8fbSSteven J. Magnani if (inode->i_ino != MSDOS_ROOT_INO) { 4037669e8fbSSteven J. Magnani struct hlist_head *head = sbi->inode_hashtable 4047669e8fbSSteven J. Magnani + fat_hash(i_pos); 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 4071da177e4SLinus Torvalds MSDOS_I(inode)->i_pos = i_pos; 408d3dfa822SOGAWA Hirofumi hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head); 4091da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 4101da177e4SLinus Torvalds } 4117669e8fbSSteven J. Magnani 4127669e8fbSSteven J. Magnani /* If NFS support is enabled, cache the mapping of start cluster 4137669e8fbSSteven J. Magnani * to directory inode. This is used during reconnection of 4147669e8fbSSteven J. Magnani * dentries to the filesystem root. 4157669e8fbSSteven J. Magnani */ 4167669e8fbSSteven J. Magnani if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { 4177669e8fbSSteven J. Magnani struct hlist_head *d_head = sbi->dir_hashtable; 4187669e8fbSSteven J. Magnani d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart); 4197669e8fbSSteven J. Magnani 4207669e8fbSSteven J. Magnani spin_lock(&sbi->dir_hash_lock); 4217669e8fbSSteven J. Magnani hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head); 4227669e8fbSSteven J. Magnani spin_unlock(&sbi->dir_hash_lock); 4237669e8fbSSteven J. Magnani } 4247669e8fbSSteven J. Magnani } 4257c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_attach); 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds void fat_detach(struct inode *inode) 4281da177e4SLinus Torvalds { 4291da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 4301da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 4311da177e4SLinus Torvalds MSDOS_I(inode)->i_pos = 0; 4321da177e4SLinus Torvalds hlist_del_init(&MSDOS_I(inode)->i_fat_hash); 4331da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 4347669e8fbSSteven J. Magnani 4357669e8fbSSteven J. Magnani if (S_ISDIR(inode->i_mode) && sbi->options.nfs) { 4367669e8fbSSteven J. Magnani spin_lock(&sbi->dir_hash_lock); 4377669e8fbSSteven J. Magnani hlist_del_init(&MSDOS_I(inode)->i_dir_hash); 4387669e8fbSSteven J. Magnani spin_unlock(&sbi->dir_hash_lock); 4397669e8fbSSteven J. Magnani } 4401da177e4SLinus Torvalds } 4417c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_detach); 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds struct inode *fat_iget(struct super_block *sb, loff_t i_pos) 4441da177e4SLinus Torvalds { 4451da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 446d3dfa822SOGAWA Hirofumi struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos); 4471da177e4SLinus Torvalds struct msdos_inode_info *i; 4481da177e4SLinus Torvalds struct inode *inode = NULL; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 451b67bfe0dSSasha Levin hlist_for_each_entry(i, head, i_fat_hash) { 4521da177e4SLinus Torvalds BUG_ON(i->vfs_inode.i_sb != sb); 4531da177e4SLinus Torvalds if (i->i_pos != i_pos) 4541da177e4SLinus Torvalds continue; 4551da177e4SLinus Torvalds inode = igrab(&i->vfs_inode); 4561da177e4SLinus Torvalds if (inode) 4571da177e4SLinus Torvalds break; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 4601da177e4SLinus Torvalds return inode; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds static int is_exec(unsigned char *extension) 4641da177e4SLinus Torvalds { 465ef19470eSManuel Schölling unsigned char exe_extensions[] = "EXECOMBAT", *walk; 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds for (walk = exe_extensions; *walk; walk += 3) 4681da177e4SLinus Torvalds if (!strncmp(extension, walk, 3)) 4691da177e4SLinus Torvalds return 1; 4701da177e4SLinus Torvalds return 0; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds static int fat_calc_dir_size(struct inode *inode) 4741da177e4SLinus Torvalds { 4751da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 4761da177e4SLinus Torvalds int ret, fclus, dclus; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds inode->i_size = 0; 4791da177e4SLinus Torvalds if (MSDOS_I(inode)->i_start == 0) 4801da177e4SLinus Torvalds return 0; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus); 4831da177e4SLinus Torvalds if (ret < 0) 4841da177e4SLinus Torvalds return ret; 4851da177e4SLinus Torvalds inode->i_size = (fclus + 1) << sbi->cluster_bits; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds return 0; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds 490a3082d52SOGAWA Hirofumi static int fat_validate_dir(struct inode *dir) 491a3082d52SOGAWA Hirofumi { 492a3082d52SOGAWA Hirofumi struct super_block *sb = dir->i_sb; 493a3082d52SOGAWA Hirofumi 494a3082d52SOGAWA Hirofumi if (dir->i_nlink < 2) { 495a3082d52SOGAWA Hirofumi /* Directory should have "."/".." entries at least. */ 496a3082d52SOGAWA Hirofumi fat_fs_error(sb, "corrupted directory (invalid entries)"); 497a3082d52SOGAWA Hirofumi return -EIO; 498a3082d52SOGAWA Hirofumi } 499a3082d52SOGAWA Hirofumi if (MSDOS_I(dir)->i_start == 0 || 500a3082d52SOGAWA Hirofumi MSDOS_I(dir)->i_start == MSDOS_SB(sb)->root_cluster) { 501a3082d52SOGAWA Hirofumi /* Directory should point valid cluster. */ 502a3082d52SOGAWA Hirofumi fat_fs_error(sb, "corrupted directory (invalid i_start)"); 503a3082d52SOGAWA Hirofumi return -EIO; 504a3082d52SOGAWA Hirofumi } 505a3082d52SOGAWA Hirofumi return 0; 506a3082d52SOGAWA Hirofumi } 507a3082d52SOGAWA Hirofumi 5081da177e4SLinus Torvalds /* doesn't deal with root inode */ 509f1e6fb0aSNamjae Jeon int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) 5101da177e4SLinus Torvalds { 5111da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 5121da177e4SLinus Torvalds int error; 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds MSDOS_I(inode)->i_pos = 0; 5151da177e4SLinus Torvalds inode->i_uid = sbi->options.fs_uid; 5161da177e4SLinus Torvalds inode->i_gid = sbi->options.fs_gid; 5172489dbabSJeff Layton inode_inc_iversion(inode); 5181da177e4SLinus Torvalds inode->i_generation = get_seconds(); 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { 5211da177e4SLinus Torvalds inode->i_generation &= ~1; 5229c0aa1b8SOGAWA Hirofumi inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO); 5231da177e4SLinus Torvalds inode->i_op = sbi->dir_ops; 5241da177e4SLinus Torvalds inode->i_fop = &fat_dir_operations; 5251da177e4SLinus Torvalds 526a943ed71SSteven J. Magnani MSDOS_I(inode)->i_start = fat_get_start(sbi, de); 5271da177e4SLinus Torvalds MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; 5281da177e4SLinus Torvalds error = fat_calc_dir_size(inode); 5291da177e4SLinus Torvalds if (error < 0) 5301da177e4SLinus Torvalds return error; 5311da177e4SLinus Torvalds MSDOS_I(inode)->mmu_private = inode->i_size; 5321da177e4SLinus Torvalds 533bfe86848SMiklos Szeredi set_nlink(inode, fat_subdirs(inode)); 534a3082d52SOGAWA Hirofumi 535a3082d52SOGAWA Hirofumi error = fat_validate_dir(inode); 536a3082d52SOGAWA Hirofumi if (error < 0) 537a3082d52SOGAWA Hirofumi return error; 5381da177e4SLinus Torvalds } else { /* not a directory */ 5391da177e4SLinus Torvalds inode->i_generation |= 1; 5409c0aa1b8SOGAWA Hirofumi inode->i_mode = fat_make_mode(sbi, de->attr, 5419aacd599SOGAWA Hirofumi ((sbi->options.showexec && !is_exec(de->name + 8)) 5429c0aa1b8SOGAWA Hirofumi ? S_IRUGO|S_IWUGO : S_IRWXUGO)); 543a943ed71SSteven J. Magnani MSDOS_I(inode)->i_start = fat_get_start(sbi, de); 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start; 5461da177e4SLinus Torvalds inode->i_size = le32_to_cpu(de->size); 5471da177e4SLinus Torvalds inode->i_op = &fat_file_inode_operations; 5481da177e4SLinus Torvalds inode->i_fop = &fat_file_operations; 5491da177e4SLinus Torvalds inode->i_mapping->a_ops = &fat_aops; 5501da177e4SLinus Torvalds MSDOS_I(inode)->mmu_private = inode->i_size; 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds if (de->attr & ATTR_SYS) { 5531da177e4SLinus Torvalds if (sbi->options.sys_immutable) 5541da177e4SLinus Torvalds inode->i_flags |= S_IMMUTABLE; 5551da177e4SLinus Torvalds } 5569c0aa1b8SOGAWA Hirofumi fat_save_attrs(inode, de->attr); 5579c0aa1b8SOGAWA Hirofumi 5581da177e4SLinus Torvalds inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) 5591da177e4SLinus Torvalds & ~((loff_t)sbi->cluster_size - 1)) >> 9; 5607decd1cbSOGAWA Hirofumi 561f423420cSArnd Bergmann fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); 5621da177e4SLinus Torvalds if (sbi->options.isvfat) { 563f423420cSArnd Bergmann fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, 5647decd1cbSOGAWA Hirofumi de->cdate, de->ctime_cs); 565f423420cSArnd Bergmann fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); 5661da177e4SLinus Torvalds } else 567cd83f6b1SFrank Sorenson fat_truncate_time(inode, &inode->i_mtime, S_ATIME|S_CTIME); 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds return 0; 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds 5728fceb4e0SNamjae Jeon static inline void fat_lock_build_inode(struct msdos_sb_info *sbi) 5738fceb4e0SNamjae Jeon { 5748fceb4e0SNamjae Jeon if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) 5758fceb4e0SNamjae Jeon mutex_lock(&sbi->nfs_build_inode_lock); 5768fceb4e0SNamjae Jeon } 5778fceb4e0SNamjae Jeon 5788fceb4e0SNamjae Jeon static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi) 5798fceb4e0SNamjae Jeon { 5808fceb4e0SNamjae Jeon if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) 5818fceb4e0SNamjae Jeon mutex_unlock(&sbi->nfs_build_inode_lock); 5828fceb4e0SNamjae Jeon } 5838fceb4e0SNamjae Jeon 5841da177e4SLinus Torvalds struct inode *fat_build_inode(struct super_block *sb, 5851da177e4SLinus Torvalds struct msdos_dir_entry *de, loff_t i_pos) 5861da177e4SLinus Torvalds { 5871da177e4SLinus Torvalds struct inode *inode; 5881da177e4SLinus Torvalds int err; 5891da177e4SLinus Torvalds 5908fceb4e0SNamjae Jeon fat_lock_build_inode(MSDOS_SB(sb)); 5911da177e4SLinus Torvalds inode = fat_iget(sb, i_pos); 5921da177e4SLinus Torvalds if (inode) 5931da177e4SLinus Torvalds goto out; 5941da177e4SLinus Torvalds inode = new_inode(sb); 5951da177e4SLinus Torvalds if (!inode) { 5961da177e4SLinus Torvalds inode = ERR_PTR(-ENOMEM); 5971da177e4SLinus Torvalds goto out; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds inode->i_ino = iunique(sb, MSDOS_ROOT_INO); 6002489dbabSJeff Layton inode_set_iversion(inode, 1); 6011da177e4SLinus Torvalds err = fat_fill_inode(inode, de); 6021da177e4SLinus Torvalds if (err) { 6031da177e4SLinus Torvalds iput(inode); 6041da177e4SLinus Torvalds inode = ERR_PTR(err); 6051da177e4SLinus Torvalds goto out; 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds fat_attach(inode, i_pos); 6081da177e4SLinus Torvalds insert_inode_hash(inode); 6091da177e4SLinus Torvalds out: 6108fceb4e0SNamjae Jeon fat_unlock_build_inode(MSDOS_SB(sb)); 6111da177e4SLinus Torvalds return inode; 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6147c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_build_inode); 6151da177e4SLinus Torvalds 616b13bb33eSNamjae Jeon static int __fat_write_inode(struct inode *inode, int wait); 617b13bb33eSNamjae Jeon 618b13bb33eSNamjae Jeon static void fat_free_eofblocks(struct inode *inode) 619b13bb33eSNamjae Jeon { 620b13bb33eSNamjae Jeon /* Release unwritten fallocated blocks on inode eviction. */ 621b13bb33eSNamjae Jeon if ((inode->i_blocks << 9) > 622b13bb33eSNamjae Jeon round_up(MSDOS_I(inode)->mmu_private, 623b13bb33eSNamjae Jeon MSDOS_SB(inode->i_sb)->cluster_size)) { 624b13bb33eSNamjae Jeon int err; 625b13bb33eSNamjae Jeon 626b13bb33eSNamjae Jeon fat_truncate_blocks(inode, MSDOS_I(inode)->mmu_private); 627b13bb33eSNamjae Jeon /* Fallocate results in updating the i_start/iogstart 628b13bb33eSNamjae Jeon * for the zero byte file. So, make it return to 629b13bb33eSNamjae Jeon * original state during evict and commit it to avoid 630b13bb33eSNamjae Jeon * any corruption on the next access to the cluster 631b13bb33eSNamjae Jeon * chain for the file. 632b13bb33eSNamjae Jeon */ 633b13bb33eSNamjae Jeon err = __fat_write_inode(inode, inode_needs_sync(inode)); 634b13bb33eSNamjae Jeon if (err) { 635b13bb33eSNamjae Jeon fat_msg(inode->i_sb, KERN_WARNING, "Failed to " 636b13bb33eSNamjae Jeon "update on disk inode for unused " 637b13bb33eSNamjae Jeon "fallocated blocks, inode could be " 638b13bb33eSNamjae Jeon "corrupted. Please run fsck"); 639b13bb33eSNamjae Jeon } 640b13bb33eSNamjae Jeon 641b13bb33eSNamjae Jeon } 642b13bb33eSNamjae Jeon } 643b13bb33eSNamjae Jeon 644deee3ce4SAl Viro static void fat_evict_inode(struct inode *inode) 6451da177e4SLinus Torvalds { 64691b0abe3SJohannes Weiner truncate_inode_pages_final(&inode->i_data); 647deee3ce4SAl Viro if (!inode->i_nlink) { 6481da177e4SLinus Torvalds inode->i_size = 0; 649459f6ed3Snpiggin@suse.de fat_truncate_blocks(inode, 0); 650b13bb33eSNamjae Jeon } else 651b13bb33eSNamjae Jeon fat_free_eofblocks(inode); 652b13bb33eSNamjae Jeon 653deee3ce4SAl Viro invalidate_inode_buffers(inode); 654dbd5768fSJan Kara clear_inode(inode); 6551da177e4SLinus Torvalds fat_cache_inval_inode(inode); 656a993b542SOGAWA Hirofumi fat_detach(inode); 6571da177e4SLinus Torvalds } 6581da177e4SLinus Torvalds 659b88a1058SOleksij Rempel static void fat_set_state(struct super_block *sb, 660b88a1058SOleksij Rempel unsigned int set, unsigned int force) 661b88a1058SOleksij Rempel { 662b88a1058SOleksij Rempel struct buffer_head *bh; 663b88a1058SOleksij Rempel struct fat_boot_sector *b; 664d6bd4282SFred Chou struct msdos_sb_info *sbi = MSDOS_SB(sb); 665b88a1058SOleksij Rempel 666b88a1058SOleksij Rempel /* do not change any thing if mounted read only */ 667bc98a42cSDavid Howells if (sb_rdonly(sb) && !force) 668b88a1058SOleksij Rempel return; 669b88a1058SOleksij Rempel 670b88a1058SOleksij Rempel /* do not change state if fs was dirty */ 671b88a1058SOleksij Rempel if (sbi->dirty) { 672b88a1058SOleksij Rempel /* warn only on set (mount). */ 673b88a1058SOleksij Rempel if (set) 674b88a1058SOleksij Rempel fat_msg(sb, KERN_WARNING, "Volume was not properly " 675b88a1058SOleksij Rempel "unmounted. Some data may be corrupt. " 676b88a1058SOleksij Rempel "Please run fsck."); 677b88a1058SOleksij Rempel return; 678b88a1058SOleksij Rempel } 679b88a1058SOleksij Rempel 680b88a1058SOleksij Rempel bh = sb_bread(sb, 0); 681b88a1058SOleksij Rempel if (bh == NULL) { 682b88a1058SOleksij Rempel fat_msg(sb, KERN_ERR, "unable to read boot sector " 683b88a1058SOleksij Rempel "to mark fs as dirty"); 684b88a1058SOleksij Rempel return; 685b88a1058SOleksij Rempel } 686b88a1058SOleksij Rempel 687b88a1058SOleksij Rempel b = (struct fat_boot_sector *) bh->b_data; 688b88a1058SOleksij Rempel 689306790f7SCarmeli Tamir if (is_fat32(sbi)) { 690b88a1058SOleksij Rempel if (set) 691b88a1058SOleksij Rempel b->fat32.state |= FAT_STATE_DIRTY; 692b88a1058SOleksij Rempel else 693b88a1058SOleksij Rempel b->fat32.state &= ~FAT_STATE_DIRTY; 694b88a1058SOleksij Rempel } else /* fat 16 and 12 */ { 695b88a1058SOleksij Rempel if (set) 696b88a1058SOleksij Rempel b->fat16.state |= FAT_STATE_DIRTY; 697b88a1058SOleksij Rempel else 698b88a1058SOleksij Rempel b->fat16.state &= ~FAT_STATE_DIRTY; 699b88a1058SOleksij Rempel } 700b88a1058SOleksij Rempel 701b88a1058SOleksij Rempel mark_buffer_dirty(bh); 702b88a1058SOleksij Rempel sync_dirty_buffer(bh); 703b88a1058SOleksij Rempel brelse(bh); 704b88a1058SOleksij Rempel } 705b88a1058SOleksij Rempel 70635033ab9SOGAWA Hirofumi static void fat_reset_iocharset(struct fat_mount_options *opts) 70735033ab9SOGAWA Hirofumi { 70835033ab9SOGAWA Hirofumi if (opts->iocharset != fat_default_iocharset) { 70935033ab9SOGAWA Hirofumi /* Note: opts->iocharset can be NULL here */ 71035033ab9SOGAWA Hirofumi kfree(opts->iocharset); 71135033ab9SOGAWA Hirofumi opts->iocharset = fat_default_iocharset; 71235033ab9SOGAWA Hirofumi } 71335033ab9SOGAWA Hirofumi } 71435033ab9SOGAWA Hirofumi 715cac45b06SAl Viro static void delayed_free(struct rcu_head *p) 716cac45b06SAl Viro { 717cac45b06SAl Viro struct msdos_sb_info *sbi = container_of(p, struct msdos_sb_info, rcu); 718cac45b06SAl Viro unload_nls(sbi->nls_disk); 719cac45b06SAl Viro unload_nls(sbi->nls_io); 72035033ab9SOGAWA Hirofumi fat_reset_iocharset(&sbi->options); 721cac45b06SAl Viro kfree(sbi); 722cac45b06SAl Viro } 723cac45b06SAl Viro 724a6bf6b21SOGAWA Hirofumi static void fat_put_super(struct super_block *sb) 725a6bf6b21SOGAWA Hirofumi { 726a6bf6b21SOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(sb); 7271da177e4SLinus Torvalds 728b88a1058SOleksij Rempel fat_set_state(sb, 0, 0); 729b88a1058SOleksij Rempel 730020ac5b6SArtem Bityutskiy iput(sbi->fsinfo_inode); 731b522412aSAl Viro iput(sbi->fat_inode); 732b522412aSAl Viro 733cac45b06SAl Viro call_rcu(&sbi->rcu, delayed_free); 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 736e18b890bSChristoph Lameter static struct kmem_cache *fat_inode_cachep; 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds static struct inode *fat_alloc_inode(struct super_block *sb) 7391da177e4SLinus Torvalds { 7401da177e4SLinus Torvalds struct msdos_inode_info *ei; 7418f593427SLinus Torvalds ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); 7421da177e4SLinus Torvalds if (!ei) 7431da177e4SLinus Torvalds return NULL; 74458268691SChristoph Hellwig 74558268691SChristoph Hellwig init_rwsem(&ei->truncate_lock); 7461da177e4SLinus Torvalds return &ei->vfs_inode; 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 749*f9ec991dSAl Viro static void fat_free_inode(struct inode *inode) 750fa0d7e3dSNick Piggin { 751fa0d7e3dSNick Piggin kmem_cache_free(fat_inode_cachep, MSDOS_I(inode)); 752fa0d7e3dSNick Piggin } 753fa0d7e3dSNick Piggin 75451cc5068SAlexey Dobriyan static void init_once(void *foo) 7551da177e4SLinus Torvalds { 7561da177e4SLinus Torvalds struct msdos_inode_info *ei = (struct msdos_inode_info *)foo; 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds spin_lock_init(&ei->cache_lru_lock); 7591da177e4SLinus Torvalds ei->nr_caches = 0; 7601da177e4SLinus Torvalds ei->cache_valid_id = FAT_CACHE_VALID + 1; 7611da177e4SLinus Torvalds INIT_LIST_HEAD(&ei->cache_lru); 7621da177e4SLinus Torvalds INIT_HLIST_NODE(&ei->i_fat_hash); 7637669e8fbSSteven J. Magnani INIT_HLIST_NODE(&ei->i_dir_hash); 7641da177e4SLinus Torvalds inode_init_once(&ei->vfs_inode); 7651da177e4SLinus Torvalds } 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds static int __init fat_init_inodecache(void) 7681da177e4SLinus Torvalds { 7691da177e4SLinus Torvalds fat_inode_cachep = kmem_cache_create("fat_inode_cache", 7701da177e4SLinus Torvalds sizeof(struct msdos_inode_info), 771fffb60f9SPaul Jackson 0, (SLAB_RECLAIM_ACCOUNT| 7725d097056SVladimir Davydov SLAB_MEM_SPREAD|SLAB_ACCOUNT), 77320c2df83SPaul Mundt init_once); 7741da177e4SLinus Torvalds if (fat_inode_cachep == NULL) 7751da177e4SLinus Torvalds return -ENOMEM; 7761da177e4SLinus Torvalds return 0; 7771da177e4SLinus Torvalds } 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds static void __exit fat_destroy_inodecache(void) 7801da177e4SLinus Torvalds { 7818c0a8537SKirill A. Shutemov /* 7828c0a8537SKirill A. Shutemov * Make sure all delayed rcu free inodes are flushed before we 7838c0a8537SKirill A. Shutemov * destroy cache. 7848c0a8537SKirill A. Shutemov */ 7858c0a8537SKirill A. Shutemov rcu_barrier(); 7861a1d92c1SAlexey Dobriyan kmem_cache_destroy(fat_inode_cachep); 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds static int fat_remount(struct super_block *sb, int *flags, char *data) 7901da177e4SLinus Torvalds { 791b6e8e12cSOGAWA Hirofumi bool new_rdonly; 7921da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 7931751e8a6SLinus Torvalds *flags |= SB_NODIRATIME | (sbi->options.isvfat ? 0 : SB_NOATIME); 794b88a1058SOleksij Rempel 79502b9984dSTheodore Ts'o sync_filesystem(sb); 79602b9984dSTheodore Ts'o 797b88a1058SOleksij Rempel /* make sure we update state on remount. */ 7981751e8a6SLinus Torvalds new_rdonly = *flags & SB_RDONLY; 799bc98a42cSDavid Howells if (new_rdonly != sb_rdonly(sb)) { 800b88a1058SOleksij Rempel if (new_rdonly) 801b88a1058SOleksij Rempel fat_set_state(sb, 0, 0); 802b88a1058SOleksij Rempel else 803b88a1058SOleksij Rempel fat_set_state(sb, 1, 1); 804b88a1058SOleksij Rempel } 8051da177e4SLinus Torvalds return 0; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 808726c3342SDavid Howells static int fat_statfs(struct dentry *dentry, struct kstatfs *buf) 8091da177e4SLinus Torvalds { 810aac49b75SColy Li struct super_block *sb = dentry->d_sb; 811aac49b75SColy Li struct msdos_sb_info *sbi = MSDOS_SB(sb); 812aac49b75SColy Li u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds /* If the count of free cluster is still unknown, counts it here. */ 815606e423eSOGAWA Hirofumi if (sbi->free_clusters == -1 || !sbi->free_clus_valid) { 816726c3342SDavid Howells int err = fat_count_free_clusters(dentry->d_sb); 8171da177e4SLinus Torvalds if (err) 8181da177e4SLinus Torvalds return err; 8191da177e4SLinus Torvalds } 8201da177e4SLinus Torvalds 821726c3342SDavid Howells buf->f_type = dentry->d_sb->s_magic; 8221da177e4SLinus Torvalds buf->f_bsize = sbi->cluster_size; 8231da177e4SLinus Torvalds buf->f_blocks = sbi->max_cluster - FAT_START_ENT; 8241da177e4SLinus Torvalds buf->f_bfree = sbi->free_clusters; 8251da177e4SLinus Torvalds buf->f_bavail = sbi->free_clusters; 826aac49b75SColy Li buf->f_fsid.val[0] = (u32)id; 827aac49b75SColy Li buf->f_fsid.val[1] = (u32)(id >> 32); 828f68e542fSOGAWA Hirofumi buf->f_namelen = 829f68e542fSOGAWA Hirofumi (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE; 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds return 0; 8321da177e4SLinus Torvalds } 8331da177e4SLinus Torvalds 834a9185b41SChristoph Hellwig static int __fat_write_inode(struct inode *inode, int wait) 8351da177e4SLinus Torvalds { 8361da177e4SLinus Torvalds struct super_block *sb = inode->i_sb; 8371da177e4SLinus Torvalds struct msdos_sb_info *sbi = MSDOS_SB(sb); 8381da177e4SLinus Torvalds struct buffer_head *bh; 8391da177e4SLinus Torvalds struct msdos_dir_entry *raw_entry; 8401da177e4SLinus Torvalds loff_t i_pos; 841e22a4442SNamjae Jeon sector_t blocknr; 842e22a4442SNamjae Jeon int err, offset; 8431da177e4SLinus Torvalds 8449ca59f4cSOGAWA Hirofumi if (inode->i_ino == MSDOS_ROOT_INO) 8459ca59f4cSOGAWA Hirofumi return 0; 8469ca59f4cSOGAWA Hirofumi 8471da177e4SLinus Torvalds retry: 8489ca59f4cSOGAWA Hirofumi i_pos = fat_i_pos_read(sbi, inode); 8499ca59f4cSOGAWA Hirofumi if (!i_pos) 8501da177e4SLinus Torvalds return 0; 8511da177e4SLinus Torvalds 852e22a4442SNamjae Jeon fat_get_blknr_offset(sbi, i_pos, &blocknr, &offset); 853e22a4442SNamjae Jeon bh = sb_bread(sb, blocknr); 8541da177e4SLinus Torvalds if (!bh) { 855869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to read inode block " 856869f58c0SAlexey Fisher "for updating (i_pos %lld)", i_pos); 8575f22ca9bSLinus Torvalds return -EIO; 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds spin_lock(&sbi->inode_hash_lock); 8601da177e4SLinus Torvalds if (i_pos != MSDOS_I(inode)->i_pos) { 8611da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 8621da177e4SLinus Torvalds brelse(bh); 8631da177e4SLinus Torvalds goto retry; 8641da177e4SLinus Torvalds } 8651da177e4SLinus Torvalds 866e22a4442SNamjae Jeon raw_entry = &((struct msdos_dir_entry *) (bh->b_data))[offset]; 8671da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 8681da177e4SLinus Torvalds raw_entry->size = 0; 8691da177e4SLinus Torvalds else 8701da177e4SLinus Torvalds raw_entry->size = cpu_to_le32(inode->i_size); 8719c0aa1b8SOGAWA Hirofumi raw_entry->attr = fat_make_attrs(inode); 872a943ed71SSteven J. Magnani fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart); 873f423420cSArnd Bergmann fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time, 8747decd1cbSOGAWA Hirofumi &raw_entry->date, NULL); 8751da177e4SLinus Torvalds if (sbi->options.isvfat) { 87662a36c43SStephane Kardas __le16 atime; 877f423420cSArnd Bergmann fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, 8787decd1cbSOGAWA Hirofumi &raw_entry->cdate, &raw_entry->ctime_cs); 879f423420cSArnd Bergmann fat_time_unix2fat(sbi, &inode->i_atime, &atime, 8807decd1cbSOGAWA Hirofumi &raw_entry->adate, NULL); 8811da177e4SLinus Torvalds } 8821da177e4SLinus Torvalds spin_unlock(&sbi->inode_hash_lock); 8831da177e4SLinus Torvalds mark_buffer_dirty(bh); 8845f22ca9bSLinus Torvalds err = 0; 8851da177e4SLinus Torvalds if (wait) 8861da177e4SLinus Torvalds err = sync_dirty_buffer(bh); 8871da177e4SLinus Torvalds brelse(bh); 8881da177e4SLinus Torvalds return err; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 891a9185b41SChristoph Hellwig static int fat_write_inode(struct inode *inode, struct writeback_control *wbc) 892a9185b41SChristoph Hellwig { 89378491189SArtem Bityutskiy int err; 89478491189SArtem Bityutskiy 89578491189SArtem Bityutskiy if (inode->i_ino == MSDOS_FSINFO_INO) { 89678491189SArtem Bityutskiy struct super_block *sb = inode->i_sb; 89778491189SArtem Bityutskiy 898e40b34c7SMarco Stornelli mutex_lock(&MSDOS_SB(sb)->s_lock); 89978491189SArtem Bityutskiy err = fat_clusters_flush(sb); 900e40b34c7SMarco Stornelli mutex_unlock(&MSDOS_SB(sb)->s_lock); 90178491189SArtem Bityutskiy } else 90278491189SArtem Bityutskiy err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); 90378491189SArtem Bityutskiy 90478491189SArtem Bityutskiy return err; 905a9185b41SChristoph Hellwig } 906a9185b41SChristoph Hellwig 9071da177e4SLinus Torvalds int fat_sync_inode(struct inode *inode) 9081da177e4SLinus Torvalds { 909a9185b41SChristoph Hellwig return __fat_write_inode(inode, 1); 9101da177e4SLinus Torvalds } 9111da177e4SLinus Torvalds 9127c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_sync_inode); 9131da177e4SLinus Torvalds 91434c80b1dSAl Viro static int fat_show_options(struct seq_file *m, struct dentry *root); 915ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations fat_sops = { 9161da177e4SLinus Torvalds .alloc_inode = fat_alloc_inode, 917*f9ec991dSAl Viro .free_inode = fat_free_inode, 9181da177e4SLinus Torvalds .write_inode = fat_write_inode, 919deee3ce4SAl Viro .evict_inode = fat_evict_inode, 9201da177e4SLinus Torvalds .put_super = fat_put_super, 9211da177e4SLinus Torvalds .statfs = fat_statfs, 9221da177e4SLinus Torvalds .remount_fs = fat_remount, 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds .show_options = fat_show_options, 9251da177e4SLinus Torvalds }; 9261da177e4SLinus Torvalds 92734c80b1dSAl Viro static int fat_show_options(struct seq_file *m, struct dentry *root) 9281da177e4SLinus Torvalds { 92934c80b1dSAl Viro struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb); 9301da177e4SLinus Torvalds struct fat_mount_options *opts = &sbi->options; 9311da177e4SLinus Torvalds int isvfat = opts->isvfat; 9321da177e4SLinus Torvalds 933170782ebSEric W. Biederman if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) 934170782ebSEric W. Biederman seq_printf(m, ",uid=%u", 935170782ebSEric W. Biederman from_kuid_munged(&init_user_ns, opts->fs_uid)); 936170782ebSEric W. Biederman if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) 937170782ebSEric W. Biederman seq_printf(m, ",gid=%u", 938170782ebSEric W. Biederman from_kgid_munged(&init_user_ns, opts->fs_gid)); 9391da177e4SLinus Torvalds seq_printf(m, ",fmask=%04o", opts->fs_fmask); 9401da177e4SLinus Torvalds seq_printf(m, ",dmask=%04o", opts->fs_dmask); 9411ae43f82SOGAWA Hirofumi if (opts->allow_utime) 9421ae43f82SOGAWA Hirofumi seq_printf(m, ",allow_utime=%04o", opts->allow_utime); 9431da177e4SLinus Torvalds if (sbi->nls_disk) 944c6c20372SDave Reisner /* strip "cp" prefix from displayed option */ 945c6c20372SDave Reisner seq_printf(m, ",codepage=%s", &sbi->nls_disk->charset[2]); 9461da177e4SLinus Torvalds if (isvfat) { 9471da177e4SLinus Torvalds if (sbi->nls_io) 9481da177e4SLinus Torvalds seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds switch (opts->shortname) { 9511da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95: 9521da177e4SLinus Torvalds seq_puts(m, ",shortname=win95"); 9531da177e4SLinus Torvalds break; 9541da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT: 9551da177e4SLinus Torvalds seq_puts(m, ",shortname=winnt"); 9561da177e4SLinus Torvalds break; 9571da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95: 9581da177e4SLinus Torvalds seq_puts(m, ",shortname=mixed"); 9591da177e4SLinus Torvalds break; 9601da177e4SLinus Torvalds case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95: 96195523475SPaul Wise seq_puts(m, ",shortname=lower"); 9621da177e4SLinus Torvalds break; 9631da177e4SLinus Torvalds default: 9641da177e4SLinus Torvalds seq_puts(m, ",shortname=unknown"); 9651da177e4SLinus Torvalds break; 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds } 9681da177e4SLinus Torvalds if (opts->name_check != 'n') 9691da177e4SLinus Torvalds seq_printf(m, ",check=%c", opts->name_check); 97028ec039cSOGAWA Hirofumi if (opts->usefree) 97128ec039cSOGAWA Hirofumi seq_puts(m, ",usefree"); 9721da177e4SLinus Torvalds if (opts->quiet) 9731da177e4SLinus Torvalds seq_puts(m, ",quiet"); 9741da177e4SLinus Torvalds if (opts->showexec) 9751da177e4SLinus Torvalds seq_puts(m, ",showexec"); 9761da177e4SLinus Torvalds if (opts->sys_immutable) 9771da177e4SLinus Torvalds seq_puts(m, ",sys_immutable"); 9781da177e4SLinus Torvalds if (!isvfat) { 9791da177e4SLinus Torvalds if (opts->dotsOK) 9801da177e4SLinus Torvalds seq_puts(m, ",dotsOK=yes"); 9811da177e4SLinus Torvalds if (opts->nocase) 9821da177e4SLinus Torvalds seq_puts(m, ",nocase"); 9831da177e4SLinus Torvalds } else { 9841da177e4SLinus Torvalds if (opts->utf8) 9851da177e4SLinus Torvalds seq_puts(m, ",utf8"); 9861da177e4SLinus Torvalds if (opts->unicode_xlate) 9871da177e4SLinus Torvalds seq_puts(m, ",uni_xlate"); 9881da177e4SLinus Torvalds if (!opts->numtail) 9891da177e4SLinus Torvalds seq_puts(m, ",nonumtail"); 990dfc209c0SOGAWA Hirofumi if (opts->rodir) 991dfc209c0SOGAWA Hirofumi seq_puts(m, ",rodir"); 9921da177e4SLinus Torvalds } 993dfc209c0SOGAWA Hirofumi if (opts->flush) 994c1fca3b6SMiklos Szeredi seq_puts(m, ",flush"); 99558156c8fSJan Kara if (opts->tz_set) { 99658156c8fSJan Kara if (opts->time_offset) 99758156c8fSJan Kara seq_printf(m, ",time_offset=%d", opts->time_offset); 99858156c8fSJan Kara else 999b271e067SJoe Peterson seq_puts(m, ",tz=UTC"); 100058156c8fSJan Kara } 100185c78591SDenis Karpov if (opts->errors == FAT_ERRORS_CONT) 100285c78591SDenis Karpov seq_puts(m, ",errors=continue"); 100385c78591SDenis Karpov else if (opts->errors == FAT_ERRORS_PANIC) 100485c78591SDenis Karpov seq_puts(m, ",errors=panic"); 100585c78591SDenis Karpov else 100685c78591SDenis Karpov seq_puts(m, ",errors=remount-ro"); 10072628b7a6SNamjae Jeon if (opts->nfs == FAT_NFS_NOSTALE_RO) 10082628b7a6SNamjae Jeon seq_puts(m, ",nfs=nostale_ro"); 10092628b7a6SNamjae Jeon else if (opts->nfs) 10102628b7a6SNamjae Jeon seq_puts(m, ",nfs=stale_rw"); 1011681142f9SChristoph Hellwig if (opts->discard) 1012681142f9SChristoph Hellwig seq_puts(m, ",discard"); 1013190a8843SConrad Meyer if (opts->dos1xfloppy) 1014190a8843SConrad Meyer seq_puts(m, ",dos1xfloppy"); 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds return 0; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds enum { 10201da177e4SLinus Torvalds Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, 10211ae43f82SOGAWA Hirofumi Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, 10221ae43f82SOGAWA Hirofumi Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, 10231ae43f82SOGAWA Hirofumi Opt_immutable, Opt_dots, Opt_nodots, 10241da177e4SLinus Torvalds Opt_charset, Opt_shortname_lower, Opt_shortname_win95, 10251da177e4SLinus Torvalds Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, 10261da177e4SLinus Torvalds Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, 1027d7a83c0fSGeert Uytterhoeven Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, 102858156c8fSJan Kara Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset, 1029190a8843SConrad Meyer Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err, Opt_dos1xfloppy, 10301da177e4SLinus Torvalds }; 10311da177e4SLinus Torvalds 1032a447c093SSteven Whitehouse static const match_table_t fat_tokens = { 10331da177e4SLinus Torvalds {Opt_check_r, "check=relaxed"}, 10341da177e4SLinus Torvalds {Opt_check_s, "check=strict"}, 10351da177e4SLinus Torvalds {Opt_check_n, "check=normal"}, 10361da177e4SLinus Torvalds {Opt_check_r, "check=r"}, 10371da177e4SLinus Torvalds {Opt_check_s, "check=s"}, 10381da177e4SLinus Torvalds {Opt_check_n, "check=n"}, 10391da177e4SLinus Torvalds {Opt_uid, "uid=%u"}, 10401da177e4SLinus Torvalds {Opt_gid, "gid=%u"}, 10411da177e4SLinus Torvalds {Opt_umask, "umask=%o"}, 10421da177e4SLinus Torvalds {Opt_dmask, "dmask=%o"}, 10431da177e4SLinus Torvalds {Opt_fmask, "fmask=%o"}, 10441ae43f82SOGAWA Hirofumi {Opt_allow_utime, "allow_utime=%o"}, 10451da177e4SLinus Torvalds {Opt_codepage, "codepage=%u"}, 104628ec039cSOGAWA Hirofumi {Opt_usefree, "usefree"}, 10471da177e4SLinus Torvalds {Opt_nocase, "nocase"}, 10481da177e4SLinus Torvalds {Opt_quiet, "quiet"}, 10491da177e4SLinus Torvalds {Opt_showexec, "showexec"}, 10501da177e4SLinus Torvalds {Opt_debug, "debug"}, 10511da177e4SLinus Torvalds {Opt_immutable, "sys_immutable"}, 105285c78591SDenis Karpov {Opt_flush, "flush"}, 105385c78591SDenis Karpov {Opt_tz_utc, "tz=UTC"}, 105458156c8fSJan Kara {Opt_time_offset, "time_offset=%d"}, 105585c78591SDenis Karpov {Opt_err_cont, "errors=continue"}, 105685c78591SDenis Karpov {Opt_err_panic, "errors=panic"}, 105785c78591SDenis Karpov {Opt_err_ro, "errors=remount-ro"}, 1058681142f9SChristoph Hellwig {Opt_discard, "discard"}, 10592628b7a6SNamjae Jeon {Opt_nfs_stale_rw, "nfs"}, 10602628b7a6SNamjae Jeon {Opt_nfs_stale_rw, "nfs=stale_rw"}, 10612628b7a6SNamjae Jeon {Opt_nfs_nostale_ro, "nfs=nostale_ro"}, 1062190a8843SConrad Meyer {Opt_dos1xfloppy, "dos1xfloppy"}, 1063d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=binary"}, 1064d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=text"}, 1065d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=auto"}, 1066d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=b"}, 1067d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=t"}, 1068d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "conv=a"}, 1069d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "fat=%u"}, 1070d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "blocksize=%u"}, 1071d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "cvf_format=%20s"}, 1072d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "cvf_options=%100s"}, 1073d7a83c0fSGeert Uytterhoeven {Opt_obsolete, "posix"}, 1074ae78bf9cSChris Mason {Opt_err, NULL}, 10751da177e4SLinus Torvalds }; 1076a447c093SSteven Whitehouse static const match_table_t msdos_tokens = { 10771da177e4SLinus Torvalds {Opt_nodots, "nodots"}, 10781da177e4SLinus Torvalds {Opt_nodots, "dotsOK=no"}, 10791da177e4SLinus Torvalds {Opt_dots, "dots"}, 10801da177e4SLinus Torvalds {Opt_dots, "dotsOK=yes"}, 10811da177e4SLinus Torvalds {Opt_err, NULL} 10821da177e4SLinus Torvalds }; 1083a447c093SSteven Whitehouse static const match_table_t vfat_tokens = { 10841da177e4SLinus Torvalds {Opt_charset, "iocharset=%s"}, 10851da177e4SLinus Torvalds {Opt_shortname_lower, "shortname=lower"}, 10861da177e4SLinus Torvalds {Opt_shortname_win95, "shortname=win95"}, 10871da177e4SLinus Torvalds {Opt_shortname_winnt, "shortname=winnt"}, 10881da177e4SLinus Torvalds {Opt_shortname_mixed, "shortname=mixed"}, 10891da177e4SLinus Torvalds {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */ 10901da177e4SLinus Torvalds {Opt_utf8_no, "utf8=no"}, 10911da177e4SLinus Torvalds {Opt_utf8_no, "utf8=false"}, 10921da177e4SLinus Torvalds {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */ 10931da177e4SLinus Torvalds {Opt_utf8_yes, "utf8=yes"}, 10941da177e4SLinus Torvalds {Opt_utf8_yes, "utf8=true"}, 10951da177e4SLinus Torvalds {Opt_utf8_yes, "utf8"}, 10961da177e4SLinus Torvalds {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */ 10971da177e4SLinus Torvalds {Opt_uni_xl_no, "uni_xlate=no"}, 10981da177e4SLinus Torvalds {Opt_uni_xl_no, "uni_xlate=false"}, 10991da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */ 11001da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate=yes"}, 11011da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate=true"}, 11021da177e4SLinus Torvalds {Opt_uni_xl_yes, "uni_xlate"}, 11031da177e4SLinus Torvalds {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */ 11041da177e4SLinus Torvalds {Opt_nonumtail_no, "nonumtail=no"}, 11051da177e4SLinus Torvalds {Opt_nonumtail_no, "nonumtail=false"}, 11061da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */ 11071da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail=yes"}, 11081da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail=true"}, 11091da177e4SLinus Torvalds {Opt_nonumtail_yes, "nonumtail"}, 1110dfc209c0SOGAWA Hirofumi {Opt_rodir, "rodir"}, 11111da177e4SLinus Torvalds {Opt_err, NULL} 11121da177e4SLinus Torvalds }; 11131da177e4SLinus Torvalds 1114869f58c0SAlexey Fisher static int parse_options(struct super_block *sb, char *options, int is_vfat, 1115869f58c0SAlexey Fisher int silent, int *debug, struct fat_mount_options *opts) 11161da177e4SLinus Torvalds { 11171da177e4SLinus Torvalds char *p; 11181da177e4SLinus Torvalds substring_t args[MAX_OPT_ARGS]; 11191da177e4SLinus Torvalds int option; 11201da177e4SLinus Torvalds char *iocharset; 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds opts->isvfat = is_vfat; 11231da177e4SLinus Torvalds 1124f0ce7ee3SDavid Howells opts->fs_uid = current_uid(); 1125f0ce7ee3SDavid Howells opts->fs_gid = current_gid(); 11263e107603SOGAWA Hirofumi opts->fs_fmask = opts->fs_dmask = current_umask(); 11271ae43f82SOGAWA Hirofumi opts->allow_utime = -1; 11281da177e4SLinus Torvalds opts->codepage = fat_default_codepage; 112935033ab9SOGAWA Hirofumi fat_reset_iocharset(opts); 1130dfc209c0SOGAWA Hirofumi if (is_vfat) { 113195523475SPaul Wise opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95; 1132dfc209c0SOGAWA Hirofumi opts->rodir = 0; 1133dfc209c0SOGAWA Hirofumi } else { 11341da177e4SLinus Torvalds opts->shortname = 0; 1135dfc209c0SOGAWA Hirofumi opts->rodir = 1; 1136dfc209c0SOGAWA Hirofumi } 11371da177e4SLinus Torvalds opts->name_check = 'n'; 11381da177e4SLinus Torvalds opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; 113938739380SMaciej S. Szmigiero opts->unicode_xlate = 0; 11401da177e4SLinus Torvalds opts->numtail = 1; 114128ec039cSOGAWA Hirofumi opts->usefree = opts->nocase = 0; 114258156c8fSJan Kara opts->tz_set = 0; 11437669e8fbSSteven J. Magnani opts->nfs = 0; 114485c78591SDenis Karpov opts->errors = FAT_ERRORS_RO; 11451da177e4SLinus Torvalds *debug = 0; 11461da177e4SLinus Torvalds 114738739380SMaciej S. Szmigiero opts->utf8 = IS_ENABLED(CONFIG_FAT_DEFAULT_UTF8) && is_vfat; 114838739380SMaciej S. Szmigiero 11491da177e4SLinus Torvalds if (!options) 11508d44d974SOGAWA Hirofumi goto out; 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds while ((p = strsep(&options, ",")) != NULL) { 11531da177e4SLinus Torvalds int token; 11541da177e4SLinus Torvalds if (!*p) 11551da177e4SLinus Torvalds continue; 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds token = match_token(p, fat_tokens, args); 11581da177e4SLinus Torvalds if (token == Opt_err) { 11591da177e4SLinus Torvalds if (is_vfat) 11601da177e4SLinus Torvalds token = match_token(p, vfat_tokens, args); 11611da177e4SLinus Torvalds else 11621da177e4SLinus Torvalds token = match_token(p, msdos_tokens, args); 11631da177e4SLinus Torvalds } 11641da177e4SLinus Torvalds switch (token) { 11651da177e4SLinus Torvalds case Opt_check_s: 11661da177e4SLinus Torvalds opts->name_check = 's'; 11671da177e4SLinus Torvalds break; 11681da177e4SLinus Torvalds case Opt_check_r: 11691da177e4SLinus Torvalds opts->name_check = 'r'; 11701da177e4SLinus Torvalds break; 11711da177e4SLinus Torvalds case Opt_check_n: 11721da177e4SLinus Torvalds opts->name_check = 'n'; 11731da177e4SLinus Torvalds break; 117428ec039cSOGAWA Hirofumi case Opt_usefree: 117528ec039cSOGAWA Hirofumi opts->usefree = 1; 117628ec039cSOGAWA Hirofumi break; 11771da177e4SLinus Torvalds case Opt_nocase: 11781da177e4SLinus Torvalds if (!is_vfat) 11791da177e4SLinus Torvalds opts->nocase = 1; 11801da177e4SLinus Torvalds else { 11811da177e4SLinus Torvalds /* for backward compatibility */ 11821da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WIN95 11831da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 11841da177e4SLinus Torvalds } 11851da177e4SLinus Torvalds break; 11861da177e4SLinus Torvalds case Opt_quiet: 11871da177e4SLinus Torvalds opts->quiet = 1; 11881da177e4SLinus Torvalds break; 11891da177e4SLinus Torvalds case Opt_showexec: 11901da177e4SLinus Torvalds opts->showexec = 1; 11911da177e4SLinus Torvalds break; 11921da177e4SLinus Torvalds case Opt_debug: 11931da177e4SLinus Torvalds *debug = 1; 11941da177e4SLinus Torvalds break; 11951da177e4SLinus Torvalds case Opt_immutable: 11961da177e4SLinus Torvalds opts->sys_immutable = 1; 11971da177e4SLinus Torvalds break; 11981da177e4SLinus Torvalds case Opt_uid: 11991da177e4SLinus Torvalds if (match_int(&args[0], &option)) 12005b3d5aeaSJan Kara return -EINVAL; 1201170782ebSEric W. Biederman opts->fs_uid = make_kuid(current_user_ns(), option); 1202170782ebSEric W. Biederman if (!uid_valid(opts->fs_uid)) 12035b3d5aeaSJan Kara return -EINVAL; 12041da177e4SLinus Torvalds break; 12051da177e4SLinus Torvalds case Opt_gid: 12061da177e4SLinus Torvalds if (match_int(&args[0], &option)) 12075b3d5aeaSJan Kara return -EINVAL; 1208170782ebSEric W. Biederman opts->fs_gid = make_kgid(current_user_ns(), option); 1209170782ebSEric W. Biederman if (!gid_valid(opts->fs_gid)) 12105b3d5aeaSJan Kara return -EINVAL; 12111da177e4SLinus Torvalds break; 12121da177e4SLinus Torvalds case Opt_umask: 12131da177e4SLinus Torvalds if (match_octal(&args[0], &option)) 12145b3d5aeaSJan Kara return -EINVAL; 12151da177e4SLinus Torvalds opts->fs_fmask = opts->fs_dmask = option; 12161da177e4SLinus Torvalds break; 12171da177e4SLinus Torvalds case Opt_dmask: 12181da177e4SLinus Torvalds if (match_octal(&args[0], &option)) 12195b3d5aeaSJan Kara return -EINVAL; 12201da177e4SLinus Torvalds opts->fs_dmask = option; 12211da177e4SLinus Torvalds break; 12221da177e4SLinus Torvalds case Opt_fmask: 12231da177e4SLinus Torvalds if (match_octal(&args[0], &option)) 12245b3d5aeaSJan Kara return -EINVAL; 12251da177e4SLinus Torvalds opts->fs_fmask = option; 12261da177e4SLinus Torvalds break; 12271ae43f82SOGAWA Hirofumi case Opt_allow_utime: 12281ae43f82SOGAWA Hirofumi if (match_octal(&args[0], &option)) 12295b3d5aeaSJan Kara return -EINVAL; 12301ae43f82SOGAWA Hirofumi opts->allow_utime = option & (S_IWGRP | S_IWOTH); 12311ae43f82SOGAWA Hirofumi break; 12321da177e4SLinus Torvalds case Opt_codepage: 12331da177e4SLinus Torvalds if (match_int(&args[0], &option)) 12345b3d5aeaSJan Kara return -EINVAL; 12351da177e4SLinus Torvalds opts->codepage = option; 12361da177e4SLinus Torvalds break; 1237ae78bf9cSChris Mason case Opt_flush: 1238ae78bf9cSChris Mason opts->flush = 1; 1239ae78bf9cSChris Mason break; 124058156c8fSJan Kara case Opt_time_offset: 124158156c8fSJan Kara if (match_int(&args[0], &option)) 12425b3d5aeaSJan Kara return -EINVAL; 1243a513d869SJan Kara /* 1244a513d869SJan Kara * GMT+-12 zones may have DST corrections so at least 1245a513d869SJan Kara * 13 hours difference is needed. Make the limit 24 1246a513d869SJan Kara * just in case someone invents something unusual. 1247a513d869SJan Kara */ 1248a513d869SJan Kara if (option < -24 * 60 || option > 24 * 60) 12495b3d5aeaSJan Kara return -EINVAL; 125058156c8fSJan Kara opts->tz_set = 1; 125158156c8fSJan Kara opts->time_offset = option; 125258156c8fSJan Kara break; 1253b271e067SJoe Peterson case Opt_tz_utc: 125458156c8fSJan Kara opts->tz_set = 1; 125558156c8fSJan Kara opts->time_offset = 0; 1256b271e067SJoe Peterson break; 125785c78591SDenis Karpov case Opt_err_cont: 125885c78591SDenis Karpov opts->errors = FAT_ERRORS_CONT; 125985c78591SDenis Karpov break; 126085c78591SDenis Karpov case Opt_err_panic: 126185c78591SDenis Karpov opts->errors = FAT_ERRORS_PANIC; 126285c78591SDenis Karpov break; 126385c78591SDenis Karpov case Opt_err_ro: 126485c78591SDenis Karpov opts->errors = FAT_ERRORS_RO; 126585c78591SDenis Karpov break; 12662628b7a6SNamjae Jeon case Opt_nfs_stale_rw: 12672628b7a6SNamjae Jeon opts->nfs = FAT_NFS_STALE_RW; 12682628b7a6SNamjae Jeon break; 12692628b7a6SNamjae Jeon case Opt_nfs_nostale_ro: 12702628b7a6SNamjae Jeon opts->nfs = FAT_NFS_NOSTALE_RO; 12712628b7a6SNamjae Jeon break; 1272190a8843SConrad Meyer case Opt_dos1xfloppy: 1273190a8843SConrad Meyer opts->dos1xfloppy = 1; 1274190a8843SConrad Meyer break; 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds /* msdos specific */ 12771da177e4SLinus Torvalds case Opt_dots: 12781da177e4SLinus Torvalds opts->dotsOK = 1; 12791da177e4SLinus Torvalds break; 12801da177e4SLinus Torvalds case Opt_nodots: 12811da177e4SLinus Torvalds opts->dotsOK = 0; 12821da177e4SLinus Torvalds break; 12831da177e4SLinus Torvalds 12841da177e4SLinus Torvalds /* vfat specific */ 12851da177e4SLinus Torvalds case Opt_charset: 128635033ab9SOGAWA Hirofumi fat_reset_iocharset(opts); 12871da177e4SLinus Torvalds iocharset = match_strdup(&args[0]); 12881da177e4SLinus Torvalds if (!iocharset) 12891da177e4SLinus Torvalds return -ENOMEM; 12901da177e4SLinus Torvalds opts->iocharset = iocharset; 12911da177e4SLinus Torvalds break; 12921da177e4SLinus Torvalds case Opt_shortname_lower: 12931da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_LOWER 12941da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 12951da177e4SLinus Torvalds break; 12961da177e4SLinus Torvalds case Opt_shortname_win95: 12971da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WIN95 12981da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 12991da177e4SLinus Torvalds break; 13001da177e4SLinus Torvalds case Opt_shortname_winnt: 13011da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WINNT 13021da177e4SLinus Torvalds | VFAT_SFN_CREATE_WINNT; 13031da177e4SLinus Torvalds break; 13041da177e4SLinus Torvalds case Opt_shortname_mixed: 13051da177e4SLinus Torvalds opts->shortname = VFAT_SFN_DISPLAY_WINNT 13061da177e4SLinus Torvalds | VFAT_SFN_CREATE_WIN95; 13071da177e4SLinus Torvalds break; 13081da177e4SLinus Torvalds case Opt_utf8_no: /* 0 or no or false */ 13091da177e4SLinus Torvalds opts->utf8 = 0; 13101da177e4SLinus Torvalds break; 13111da177e4SLinus Torvalds case Opt_utf8_yes: /* empty or 1 or yes or true */ 13121da177e4SLinus Torvalds opts->utf8 = 1; 13131da177e4SLinus Torvalds break; 13141da177e4SLinus Torvalds case Opt_uni_xl_no: /* 0 or no or false */ 13151da177e4SLinus Torvalds opts->unicode_xlate = 0; 13161da177e4SLinus Torvalds break; 13171da177e4SLinus Torvalds case Opt_uni_xl_yes: /* empty or 1 or yes or true */ 13181da177e4SLinus Torvalds opts->unicode_xlate = 1; 13191da177e4SLinus Torvalds break; 13201da177e4SLinus Torvalds case Opt_nonumtail_no: /* 0 or no or false */ 13211da177e4SLinus Torvalds opts->numtail = 1; /* negated option */ 13221da177e4SLinus Torvalds break; 13231da177e4SLinus Torvalds case Opt_nonumtail_yes: /* empty or 1 or yes or true */ 13241da177e4SLinus Torvalds opts->numtail = 0; /* negated option */ 13251da177e4SLinus Torvalds break; 1326dfc209c0SOGAWA Hirofumi case Opt_rodir: 1327dfc209c0SOGAWA Hirofumi opts->rodir = 1; 1328dfc209c0SOGAWA Hirofumi break; 1329681142f9SChristoph Hellwig case Opt_discard: 1330681142f9SChristoph Hellwig opts->discard = 1; 1331681142f9SChristoph Hellwig break; 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds /* obsolete mount options */ 1334d7a83c0fSGeert Uytterhoeven case Opt_obsolete: 1335869f58c0SAlexey Fisher fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, " 1336869f58c0SAlexey Fisher "not supported now", p); 13371da177e4SLinus Torvalds break; 13381da177e4SLinus Torvalds /* unknown option */ 13391da177e4SLinus Torvalds default: 134041a34a4fSChristoph Hellwig if (!silent) { 1341869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, 1342869f58c0SAlexey Fisher "Unrecognized mount option \"%s\" " 1343869f58c0SAlexey Fisher "or missing value", p); 134441a34a4fSChristoph Hellwig } 13451da177e4SLinus Torvalds return -EINVAL; 13461da177e4SLinus Torvalds } 13471da177e4SLinus Torvalds } 13488d44d974SOGAWA Hirofumi 13498d44d974SOGAWA Hirofumi out: 13504de151d8SAlexey Dobriyan /* UTF-8 doesn't provide FAT semantics */ 13511da177e4SLinus Torvalds if (!strcmp(opts->iocharset, "utf8")) { 1352186b5370SMihai Moldovan fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset" 13538d44d974SOGAWA Hirofumi " for FAT filesystems, filesystem will be " 1354186b5370SMihai Moldovan "case sensitive!"); 13551da177e4SLinus Torvalds } 13561da177e4SLinus Torvalds 13571ae43f82SOGAWA Hirofumi /* If user doesn't specify allow_utime, it's initialized from dmask. */ 13581ae43f82SOGAWA Hirofumi if (opts->allow_utime == (unsigned short)-1) 13591ae43f82SOGAWA Hirofumi opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); 13601da177e4SLinus Torvalds if (opts->unicode_xlate) 13611da177e4SLinus Torvalds opts->utf8 = 0; 1362ea3983acSNamjae Jeon if (opts->nfs == FAT_NFS_NOSTALE_RO) { 13631751e8a6SLinus Torvalds sb->s_flags |= SB_RDONLY; 1364ea3983acSNamjae Jeon sb->s_export_op = &fat_export_ops_nostale; 1365ea3983acSNamjae Jeon } 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds return 0; 13681da177e4SLinus Torvalds } 13691da177e4SLinus Torvalds 1370c0d0e351SOGAWA Hirofumi static void fat_dummy_inode_init(struct inode *inode) 1371c0d0e351SOGAWA Hirofumi { 1372c0d0e351SOGAWA Hirofumi /* Initialize this dummy inode to work as no-op. */ 1373c0d0e351SOGAWA Hirofumi MSDOS_I(inode)->mmu_private = 0; 1374c0d0e351SOGAWA Hirofumi MSDOS_I(inode)->i_start = 0; 1375c0d0e351SOGAWA Hirofumi MSDOS_I(inode)->i_logstart = 0; 1376c0d0e351SOGAWA Hirofumi MSDOS_I(inode)->i_attrs = 0; 1377c0d0e351SOGAWA Hirofumi MSDOS_I(inode)->i_pos = 0; 1378c0d0e351SOGAWA Hirofumi } 1379c0d0e351SOGAWA Hirofumi 13801da177e4SLinus Torvalds static int fat_read_root(struct inode *inode) 13811da177e4SLinus Torvalds { 1382a40a7d9dSAlexander Kuleshov struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 13831da177e4SLinus Torvalds int error; 13841da177e4SLinus Torvalds 1385ea3983acSNamjae Jeon MSDOS_I(inode)->i_pos = MSDOS_ROOT_INO; 13861da177e4SLinus Torvalds inode->i_uid = sbi->options.fs_uid; 13871da177e4SLinus Torvalds inode->i_gid = sbi->options.fs_gid; 13882489dbabSJeff Layton inode_inc_iversion(inode); 13891da177e4SLinus Torvalds inode->i_generation = 0; 13909c0aa1b8SOGAWA Hirofumi inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO); 13911da177e4SLinus Torvalds inode->i_op = sbi->dir_ops; 13921da177e4SLinus Torvalds inode->i_fop = &fat_dir_operations; 1393306790f7SCarmeli Tamir if (is_fat32(sbi)) { 13941da177e4SLinus Torvalds MSDOS_I(inode)->i_start = sbi->root_cluster; 13951da177e4SLinus Torvalds error = fat_calc_dir_size(inode); 13961da177e4SLinus Torvalds if (error < 0) 13971da177e4SLinus Torvalds return error; 13981da177e4SLinus Torvalds } else { 13991da177e4SLinus Torvalds MSDOS_I(inode)->i_start = 0; 14001da177e4SLinus Torvalds inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry); 14011da177e4SLinus Torvalds } 14021da177e4SLinus Torvalds inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1)) 14031da177e4SLinus Torvalds & ~((loff_t)sbi->cluster_size - 1)) >> 9; 14041da177e4SLinus Torvalds MSDOS_I(inode)->i_logstart = 0; 14051da177e4SLinus Torvalds MSDOS_I(inode)->mmu_private = inode->i_size; 14061da177e4SLinus Torvalds 14079c0aa1b8SOGAWA Hirofumi fat_save_attrs(inode, ATTR_DIR); 14081da177e4SLinus Torvalds inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; 14091da177e4SLinus Torvalds inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0; 1410bfe86848SMiklos Szeredi set_nlink(inode, fat_subdirs(inode)+2); 14111da177e4SLinus Torvalds 14121da177e4SLinus Torvalds return 0; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 14157b92d03cSOGAWA Hirofumi static unsigned long calc_fat_clusters(struct super_block *sb) 14167b92d03cSOGAWA Hirofumi { 14177b92d03cSOGAWA Hirofumi struct msdos_sb_info *sbi = MSDOS_SB(sb); 14187b92d03cSOGAWA Hirofumi 14197b92d03cSOGAWA Hirofumi /* Divide first to avoid overflow */ 1420306790f7SCarmeli Tamir if (!is_fat12(sbi)) { 14217b92d03cSOGAWA Hirofumi unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits; 14227b92d03cSOGAWA Hirofumi return ent_per_sec * sbi->fat_length; 14237b92d03cSOGAWA Hirofumi } 14247b92d03cSOGAWA Hirofumi 14257b92d03cSOGAWA Hirofumi return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits; 14267b92d03cSOGAWA Hirofumi } 14277b92d03cSOGAWA Hirofumi 1428190a8843SConrad Meyer static bool fat_bpb_is_zero(struct fat_boot_sector *b) 1429190a8843SConrad Meyer { 1430190a8843SConrad Meyer if (get_unaligned_le16(&b->sector_size)) 1431190a8843SConrad Meyer return false; 1432190a8843SConrad Meyer if (b->sec_per_clus) 1433190a8843SConrad Meyer return false; 1434190a8843SConrad Meyer if (b->reserved) 1435190a8843SConrad Meyer return false; 1436190a8843SConrad Meyer if (b->fats) 1437190a8843SConrad Meyer return false; 1438190a8843SConrad Meyer if (get_unaligned_le16(&b->dir_entries)) 1439190a8843SConrad Meyer return false; 1440190a8843SConrad Meyer if (get_unaligned_le16(&b->sectors)) 1441190a8843SConrad Meyer return false; 1442190a8843SConrad Meyer if (b->media) 1443190a8843SConrad Meyer return false; 1444190a8843SConrad Meyer if (b->fat_length) 1445190a8843SConrad Meyer return false; 1446190a8843SConrad Meyer if (b->secs_track) 1447190a8843SConrad Meyer return false; 1448190a8843SConrad Meyer if (b->heads) 1449190a8843SConrad Meyer return false; 1450190a8843SConrad Meyer return true; 1451190a8843SConrad Meyer } 1452190a8843SConrad Meyer 1453190a8843SConrad Meyer static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b, 1454190a8843SConrad Meyer int silent, struct fat_bios_param_block *bpb) 1455190a8843SConrad Meyer { 1456190a8843SConrad Meyer int error = -EINVAL; 1457190a8843SConrad Meyer 1458190a8843SConrad Meyer /* Read in BPB ... */ 1459190a8843SConrad Meyer memset(bpb, 0, sizeof(*bpb)); 1460190a8843SConrad Meyer bpb->fat_sector_size = get_unaligned_le16(&b->sector_size); 1461190a8843SConrad Meyer bpb->fat_sec_per_clus = b->sec_per_clus; 1462190a8843SConrad Meyer bpb->fat_reserved = le16_to_cpu(b->reserved); 1463190a8843SConrad Meyer bpb->fat_fats = b->fats; 1464190a8843SConrad Meyer bpb->fat_dir_entries = get_unaligned_le16(&b->dir_entries); 1465190a8843SConrad Meyer bpb->fat_sectors = get_unaligned_le16(&b->sectors); 1466190a8843SConrad Meyer bpb->fat_fat_length = le16_to_cpu(b->fat_length); 1467190a8843SConrad Meyer bpb->fat_total_sect = le32_to_cpu(b->total_sect); 1468190a8843SConrad Meyer 1469190a8843SConrad Meyer bpb->fat16_state = b->fat16.state; 1470190a8843SConrad Meyer bpb->fat16_vol_id = get_unaligned_le32(b->fat16.vol_id); 1471190a8843SConrad Meyer 1472190a8843SConrad Meyer bpb->fat32_length = le32_to_cpu(b->fat32.length); 1473190a8843SConrad Meyer bpb->fat32_root_cluster = le32_to_cpu(b->fat32.root_cluster); 1474190a8843SConrad Meyer bpb->fat32_info_sector = le16_to_cpu(b->fat32.info_sector); 1475190a8843SConrad Meyer bpb->fat32_state = b->fat32.state; 1476190a8843SConrad Meyer bpb->fat32_vol_id = get_unaligned_le32(b->fat32.vol_id); 1477190a8843SConrad Meyer 1478190a8843SConrad Meyer /* Validate this looks like a FAT filesystem BPB */ 1479190a8843SConrad Meyer if (!bpb->fat_reserved) { 1480190a8843SConrad Meyer if (!silent) 1481190a8843SConrad Meyer fat_msg(sb, KERN_ERR, 1482190a8843SConrad Meyer "bogus number of reserved sectors"); 1483190a8843SConrad Meyer goto out; 1484190a8843SConrad Meyer } 1485190a8843SConrad Meyer if (!bpb->fat_fats) { 1486190a8843SConrad Meyer if (!silent) 1487190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "bogus number of FAT structure"); 1488190a8843SConrad Meyer goto out; 1489190a8843SConrad Meyer } 1490190a8843SConrad Meyer 1491190a8843SConrad Meyer /* 1492190a8843SConrad Meyer * Earlier we checked here that b->secs_track and b->head are nonzero, 1493190a8843SConrad Meyer * but it turns out valid FAT filesystems can have zero there. 1494190a8843SConrad Meyer */ 1495190a8843SConrad Meyer 1496190a8843SConrad Meyer if (!fat_valid_media(b->media)) { 1497190a8843SConrad Meyer if (!silent) 1498190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)", 1499190a8843SConrad Meyer (unsigned)b->media); 1500190a8843SConrad Meyer goto out; 1501190a8843SConrad Meyer } 1502190a8843SConrad Meyer 1503190a8843SConrad Meyer if (!is_power_of_2(bpb->fat_sector_size) 1504190a8843SConrad Meyer || (bpb->fat_sector_size < 512) 1505190a8843SConrad Meyer || (bpb->fat_sector_size > 4096)) { 1506190a8843SConrad Meyer if (!silent) 1507190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "bogus logical sector size %u", 1508190a8843SConrad Meyer (unsigned)bpb->fat_sector_size); 1509190a8843SConrad Meyer goto out; 1510190a8843SConrad Meyer } 1511190a8843SConrad Meyer 1512190a8843SConrad Meyer if (!is_power_of_2(bpb->fat_sec_per_clus)) { 1513190a8843SConrad Meyer if (!silent) 1514190a8843SConrad Meyer fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u", 1515190a8843SConrad Meyer (unsigned)bpb->fat_sec_per_clus); 1516190a8843SConrad Meyer goto out; 1517190a8843SConrad Meyer } 1518190a8843SConrad Meyer 1519190a8843SConrad Meyer error = 0; 1520190a8843SConrad Meyer 1521190a8843SConrad Meyer out: 1522190a8843SConrad Meyer return error; 1523190a8843SConrad Meyer } 1524190a8843SConrad Meyer 1525190a8843SConrad Meyer static int fat_read_static_bpb(struct super_block *sb, 1526190a8843SConrad Meyer struct fat_boot_sector *b, int silent, 1527190a8843SConrad Meyer struct fat_bios_param_block *bpb) 1528190a8843SConrad Meyer { 1529190a8843SConrad Meyer static const char *notdos1x = "This doesn't look like a DOS 1.x volume"; 1530190a8843SConrad Meyer 1531190a8843SConrad Meyer struct fat_floppy_defaults *fdefaults = NULL; 1532190a8843SConrad Meyer int error = -EINVAL; 1533190a8843SConrad Meyer sector_t bd_sects; 1534190a8843SConrad Meyer unsigned i; 1535190a8843SConrad Meyer 1536190a8843SConrad Meyer bd_sects = i_size_read(sb->s_bdev->bd_inode) / SECTOR_SIZE; 1537190a8843SConrad Meyer 1538190a8843SConrad Meyer /* 16-bit DOS 1.x reliably wrote bootstrap short-jmp code */ 1539190a8843SConrad Meyer if (b->ignored[0] != 0xeb || b->ignored[2] != 0x90) { 1540190a8843SConrad Meyer if (!silent) 1541190a8843SConrad Meyer fat_msg(sb, KERN_ERR, 1542190a8843SConrad Meyer "%s; no bootstrapping code", notdos1x); 1543190a8843SConrad Meyer goto out; 1544190a8843SConrad Meyer } 1545190a8843SConrad Meyer 1546190a8843SConrad Meyer /* 1547190a8843SConrad Meyer * If any value in this region is non-zero, it isn't archaic 1548190a8843SConrad Meyer * DOS. 1549190a8843SConrad Meyer */ 1550190a8843SConrad Meyer if (!fat_bpb_is_zero(b)) { 1551190a8843SConrad Meyer if (!silent) 1552190a8843SConrad Meyer fat_msg(sb, KERN_ERR, 1553190a8843SConrad Meyer "%s; DOS 2.x BPB is non-zero", notdos1x); 1554190a8843SConrad Meyer goto out; 1555190a8843SConrad Meyer } 1556190a8843SConrad Meyer 1557190a8843SConrad Meyer for (i = 0; i < ARRAY_SIZE(floppy_defaults); i++) { 1558190a8843SConrad Meyer if (floppy_defaults[i].nr_sectors == bd_sects) { 1559190a8843SConrad Meyer fdefaults = &floppy_defaults[i]; 1560190a8843SConrad Meyer break; 1561190a8843SConrad Meyer } 1562190a8843SConrad Meyer } 1563190a8843SConrad Meyer 1564190a8843SConrad Meyer if (fdefaults == NULL) { 1565190a8843SConrad Meyer if (!silent) 1566190a8843SConrad Meyer fat_msg(sb, KERN_WARNING, 1567190a8843SConrad Meyer "This looks like a DOS 1.x volume, but isn't a recognized floppy size (%llu sectors)", 1568190a8843SConrad Meyer (u64)bd_sects); 1569190a8843SConrad Meyer goto out; 1570190a8843SConrad Meyer } 1571190a8843SConrad Meyer 1572190a8843SConrad Meyer if (!silent) 1573190a8843SConrad Meyer fat_msg(sb, KERN_INFO, 1574190a8843SConrad Meyer "This looks like a DOS 1.x volume; assuming default BPB values"); 1575190a8843SConrad Meyer 1576190a8843SConrad Meyer memset(bpb, 0, sizeof(*bpb)); 1577190a8843SConrad Meyer bpb->fat_sector_size = SECTOR_SIZE; 1578190a8843SConrad Meyer bpb->fat_sec_per_clus = fdefaults->sec_per_clus; 1579190a8843SConrad Meyer bpb->fat_reserved = 1; 1580190a8843SConrad Meyer bpb->fat_fats = 2; 1581190a8843SConrad Meyer bpb->fat_dir_entries = fdefaults->dir_entries; 1582190a8843SConrad Meyer bpb->fat_sectors = fdefaults->nr_sectors; 1583190a8843SConrad Meyer bpb->fat_fat_length = fdefaults->fat_length; 1584190a8843SConrad Meyer 1585190a8843SConrad Meyer error = 0; 1586190a8843SConrad Meyer 1587190a8843SConrad Meyer out: 1588190a8843SConrad Meyer return error; 1589190a8843SConrad Meyer } 1590190a8843SConrad Meyer 15911da177e4SLinus Torvalds /* 15921da177e4SLinus Torvalds * Read the super block of an MS-DOS FS. 15931da177e4SLinus Torvalds */ 1594384f5c96SOGAWA Hirofumi int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, 15953d23985dSAl Viro void (*setup)(struct super_block *)) 15961da177e4SLinus Torvalds { 1597b522412aSAl Viro struct inode *root_inode = NULL, *fat_inode = NULL; 1598020ac5b6SArtem Bityutskiy struct inode *fsinfo_inode = NULL; 15991da177e4SLinus Torvalds struct buffer_head *bh; 1600190a8843SConrad Meyer struct fat_bios_param_block bpb; 16011da177e4SLinus Torvalds struct msdos_sb_info *sbi; 16021da177e4SLinus Torvalds u16 logical_sector_size; 16031da177e4SLinus Torvalds u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors; 16041da177e4SLinus Torvalds int debug; 16051da177e4SLinus Torvalds long error; 16061da177e4SLinus Torvalds char buf[50]; 16071da177e4SLinus Torvalds 16088f593427SLinus Torvalds /* 16098f593427SLinus Torvalds * GFP_KERNEL is ok here, because while we do hold the 1610dcc381e8SZheng Lv * superblock lock, memory pressure can't call back into 16118f593427SLinus Torvalds * the filesystem, since we're only just about to mount 16128f593427SLinus Torvalds * it and have no inodes etc active! 16138f593427SLinus Torvalds */ 1614f8314dc6SPanagiotis Issaris sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL); 16151da177e4SLinus Torvalds if (!sbi) 16161da177e4SLinus Torvalds return -ENOMEM; 16171da177e4SLinus Torvalds sb->s_fs_info = sbi; 16181da177e4SLinus Torvalds 16191751e8a6SLinus Torvalds sb->s_flags |= SB_NODIRATIME; 16201da177e4SLinus Torvalds sb->s_magic = MSDOS_SUPER_MAGIC; 16211da177e4SLinus Torvalds sb->s_op = &fat_sops; 16221da177e4SLinus Torvalds sb->s_export_op = &fat_export_ops; 16236bb885ecSFrank Sorenson /* 16246bb885ecSFrank Sorenson * fat timestamps are complex and truncated by fat itself, so 16256bb885ecSFrank Sorenson * we set 1 here to be fast 16266bb885ecSFrank Sorenson */ 16276bb885ecSFrank Sorenson sb->s_time_gran = 1; 16288fceb4e0SNamjae Jeon mutex_init(&sbi->nfs_build_inode_lock); 1629aaa04b48SOGAWA Hirofumi ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, 1630aaa04b48SOGAWA Hirofumi DEFAULT_RATELIMIT_BURST); 16311da177e4SLinus Torvalds 1632869f58c0SAlexey Fisher error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options); 16331da177e4SLinus Torvalds if (error) 16341da177e4SLinus Torvalds goto out_fail; 16351da177e4SLinus Torvalds 16363d23985dSAl Viro setup(sb); /* flavour-specific stuff that needs options */ 16373d23985dSAl Viro 16381da177e4SLinus Torvalds error = -EIO; 16391da177e4SLinus Torvalds sb_min_blocksize(sb, 512); 16401da177e4SLinus Torvalds bh = sb_bread(sb, 0); 16411da177e4SLinus Torvalds if (bh == NULL) { 1642869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to read boot sector"); 16431da177e4SLinus Torvalds goto out_fail; 16441da177e4SLinus Torvalds } 16451da177e4SLinus Torvalds 1646190a8843SConrad Meyer error = fat_read_bpb(sb, (struct fat_boot_sector *)bh->b_data, silent, 1647190a8843SConrad Meyer &bpb); 1648190a8843SConrad Meyer if (error == -EINVAL && sbi->options.dos1xfloppy) 1649190a8843SConrad Meyer error = fat_read_static_bpb(sb, 1650190a8843SConrad Meyer (struct fat_boot_sector *)bh->b_data, silent, &bpb); 16511da177e4SLinus Torvalds brelse(bh); 16521da177e4SLinus Torvalds 1653190a8843SConrad Meyer if (error == -EINVAL) 1654190a8843SConrad Meyer goto out_invalid; 1655190a8843SConrad Meyer else if (error) 1656190a8843SConrad Meyer goto out_fail; 16571da177e4SLinus Torvalds 1658190a8843SConrad Meyer logical_sector_size = bpb.fat_sector_size; 1659190a8843SConrad Meyer sbi->sec_per_clus = bpb.fat_sec_per_clus; 16601da177e4SLinus Torvalds 1661190a8843SConrad Meyer error = -EIO; 16621da177e4SLinus Torvalds if (logical_sector_size < sb->s_blocksize) { 1663869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "logical sector size too small for device" 1664869f58c0SAlexey Fisher " (logical sector size = %u)", logical_sector_size); 16651da177e4SLinus Torvalds goto out_fail; 16661da177e4SLinus Torvalds } 1667190a8843SConrad Meyer 16681da177e4SLinus Torvalds if (logical_sector_size > sb->s_blocksize) { 1669190a8843SConrad Meyer struct buffer_head *bh_resize; 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds if (!sb_set_blocksize(sb, logical_sector_size)) { 1672869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to set blocksize %u", 16731da177e4SLinus Torvalds logical_sector_size); 16741da177e4SLinus Torvalds goto out_fail; 16751da177e4SLinus Torvalds } 1676190a8843SConrad Meyer 1677190a8843SConrad Meyer /* Verify that the larger boot sector is fully readable */ 1678190a8843SConrad Meyer bh_resize = sb_bread(sb, 0); 1679190a8843SConrad Meyer if (bh_resize == NULL) { 1680869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "unable to read boot sector" 1681869f58c0SAlexey Fisher " (logical sector size = %lu)", 16821da177e4SLinus Torvalds sb->s_blocksize); 16831da177e4SLinus Torvalds goto out_fail; 16841da177e4SLinus Torvalds } 1685190a8843SConrad Meyer brelse(bh_resize); 16861da177e4SLinus Torvalds } 16871da177e4SLinus Torvalds 1688e40b34c7SMarco Stornelli mutex_init(&sbi->s_lock); 16891da177e4SLinus Torvalds sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus; 16901da177e4SLinus Torvalds sbi->cluster_bits = ffs(sbi->cluster_size) - 1; 1691190a8843SConrad Meyer sbi->fats = bpb.fat_fats; 16921da177e4SLinus Torvalds sbi->fat_bits = 0; /* Don't know yet */ 1693190a8843SConrad Meyer sbi->fat_start = bpb.fat_reserved; 1694190a8843SConrad Meyer sbi->fat_length = bpb.fat_fat_length; 16951da177e4SLinus Torvalds sbi->root_cluster = 0; 16961da177e4SLinus Torvalds sbi->free_clusters = -1; /* Don't know yet */ 1697606e423eSOGAWA Hirofumi sbi->free_clus_valid = 0; 16981da177e4SLinus Torvalds sbi->prev_free = FAT_START_ENT; 1699710d4403SNamjae Jeon sb->s_maxbytes = 0xffffffff; 17001da177e4SLinus Torvalds 1701190a8843SConrad Meyer if (!sbi->fat_length && bpb.fat32_length) { 17021da177e4SLinus Torvalds struct fat_boot_fsinfo *fsinfo; 17031da177e4SLinus Torvalds struct buffer_head *fsinfo_bh; 17041da177e4SLinus Torvalds 17051da177e4SLinus Torvalds /* Must be FAT32 */ 17061da177e4SLinus Torvalds sbi->fat_bits = 32; 1707190a8843SConrad Meyer sbi->fat_length = bpb.fat32_length; 1708190a8843SConrad Meyer sbi->root_cluster = bpb.fat32_root_cluster; 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds /* MC - if info_sector is 0, don't multiply by 0 */ 1711190a8843SConrad Meyer sbi->fsinfo_sector = bpb.fat32_info_sector; 17121da177e4SLinus Torvalds if (sbi->fsinfo_sector == 0) 17131da177e4SLinus Torvalds sbi->fsinfo_sector = 1; 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector); 17161da177e4SLinus Torvalds if (fsinfo_bh == NULL) { 1717869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "bread failed, FSINFO block" 1718869f58c0SAlexey Fisher " (sector = %lu)", sbi->fsinfo_sector); 17191da177e4SLinus Torvalds goto out_fail; 17201da177e4SLinus Torvalds } 17211da177e4SLinus Torvalds 17221da177e4SLinus Torvalds fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data; 17231da177e4SLinus Torvalds if (!IS_FSINFO(fsinfo)) { 1724869f58c0SAlexey Fisher fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: " 1725869f58c0SAlexey Fisher "0x%08x, 0x%08x (sector = %lu)", 17261da177e4SLinus Torvalds le32_to_cpu(fsinfo->signature1), 17271da177e4SLinus Torvalds le32_to_cpu(fsinfo->signature2), 17281da177e4SLinus Torvalds sbi->fsinfo_sector); 17291da177e4SLinus Torvalds } else { 173028ec039cSOGAWA Hirofumi if (sbi->options.usefree) 1731606e423eSOGAWA Hirofumi sbi->free_clus_valid = 1; 1732606e423eSOGAWA Hirofumi sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); 17331da177e4SLinus Torvalds sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); 17341da177e4SLinus Torvalds } 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds brelse(fsinfo_bh); 17371da177e4SLinus Torvalds } 17381da177e4SLinus Torvalds 17396e5b93eeSMike Lockwood /* interpret volume ID as a little endian 32 bit integer */ 1740306790f7SCarmeli Tamir if (is_fat32(sbi)) 1741190a8843SConrad Meyer sbi->vol_id = bpb.fat32_vol_id; 17426e5b93eeSMike Lockwood else /* fat 16 or 12 */ 1743190a8843SConrad Meyer sbi->vol_id = bpb.fat16_vol_id; 17446e5b93eeSMike Lockwood 17451da177e4SLinus Torvalds sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry); 17461da177e4SLinus Torvalds sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1; 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length; 1749190a8843SConrad Meyer sbi->dir_entries = bpb.fat_dir_entries; 17501da177e4SLinus Torvalds if (sbi->dir_entries & (sbi->dir_per_block - 1)) { 17511da177e4SLinus Torvalds if (!silent) 175234df1174SZheng Lv fat_msg(sb, KERN_ERR, "bogus number of directory entries" 1753869f58c0SAlexey Fisher " (%u)", sbi->dir_entries); 17541da177e4SLinus Torvalds goto out_invalid; 17551da177e4SLinus Torvalds } 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds rootdir_sectors = sbi->dir_entries 17581da177e4SLinus Torvalds * sizeof(struct msdos_dir_entry) / sb->s_blocksize; 17591da177e4SLinus Torvalds sbi->data_start = sbi->dir_start + rootdir_sectors; 1760190a8843SConrad Meyer total_sectors = bpb.fat_sectors; 17611da177e4SLinus Torvalds if (total_sectors == 0) 1762190a8843SConrad Meyer total_sectors = bpb.fat_total_sect; 17631da177e4SLinus Torvalds 17641da177e4SLinus Torvalds total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus; 17651da177e4SLinus Torvalds 1766306790f7SCarmeli Tamir if (!is_fat32(sbi)) 17671da177e4SLinus Torvalds sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12; 17681da177e4SLinus Torvalds 1769b88a1058SOleksij Rempel /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */ 1770306790f7SCarmeli Tamir if (is_fat32(sbi)) 1771190a8843SConrad Meyer sbi->dirty = bpb.fat32_state & FAT_STATE_DIRTY; 1772b88a1058SOleksij Rempel else /* fat 16 or 12 */ 1773190a8843SConrad Meyer sbi->dirty = bpb.fat16_state & FAT_STATE_DIRTY; 1774b88a1058SOleksij Rempel 17751da177e4SLinus Torvalds /* check that FAT table does not overflow */ 17767b92d03cSOGAWA Hirofumi fat_clusters = calc_fat_clusters(sb); 17771da177e4SLinus Torvalds total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT); 1778d19dc016SCarmeli Tamir if (total_clusters > max_fat(sb)) { 17791da177e4SLinus Torvalds if (!silent) 1780869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "count of clusters too big (%u)", 17811da177e4SLinus Torvalds total_clusters); 17821da177e4SLinus Torvalds goto out_invalid; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds sbi->max_cluster = total_clusters + FAT_START_ENT; 17861da177e4SLinus Torvalds /* check the free_clusters, it's not necessarily correct */ 17871da177e4SLinus Torvalds if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters) 17881da177e4SLinus Torvalds sbi->free_clusters = -1; 17891da177e4SLinus Torvalds /* check the prev_free, it's not necessarily correct */ 17901da177e4SLinus Torvalds sbi->prev_free %= sbi->max_cluster; 17911da177e4SLinus Torvalds if (sbi->prev_free < FAT_START_ENT) 17921da177e4SLinus Torvalds sbi->prev_free = FAT_START_ENT; 17931da177e4SLinus Torvalds 17941da177e4SLinus Torvalds /* set up enough so that it can read an inode */ 17951da177e4SLinus Torvalds fat_hash_init(sb); 17967669e8fbSSteven J. Magnani dir_hash_init(sb); 17971da177e4SLinus Torvalds fat_ent_access_init(sb); 17981da177e4SLinus Torvalds 17991da177e4SLinus Torvalds /* 1800b553337aSCarmeli Tamir * The low byte of the first FAT entry must have the same value as 1801b553337aSCarmeli Tamir * the media field of the boot sector. But in real world, too many 1802b553337aSCarmeli Tamir * devices are writing wrong values. So, removed that validity check. 18031da177e4SLinus Torvalds * 1804b553337aSCarmeli Tamir * The removed check compared the first FAT entry to a value dependent 1805b553337aSCarmeli Tamir * on the media field like this: 1806b553337aSCarmeli Tamir * == (0x0F00 | media), for FAT12 1807b553337aSCarmeli Tamir * == (0XFF00 | media), for FAT16 1808b553337aSCarmeli Tamir * == (0x0FFFFF | media), for FAT32 18091da177e4SLinus Torvalds */ 18101da177e4SLinus Torvalds 18111da177e4SLinus Torvalds error = -EINVAL; 18121da177e4SLinus Torvalds sprintf(buf, "cp%d", sbi->options.codepage); 18131da177e4SLinus Torvalds sbi->nls_disk = load_nls(buf); 18141da177e4SLinus Torvalds if (!sbi->nls_disk) { 1815869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "codepage %s not found", buf); 18161da177e4SLinus Torvalds goto out_fail; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds /* FIXME: utf8 is using iocharset for upper/lower conversion */ 18201da177e4SLinus Torvalds if (sbi->options.isvfat) { 18211da177e4SLinus Torvalds sbi->nls_io = load_nls(sbi->options.iocharset); 18221da177e4SLinus Torvalds if (!sbi->nls_io) { 1823869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "IO charset %s not found", 18241da177e4SLinus Torvalds sbi->options.iocharset); 18251da177e4SLinus Torvalds goto out_fail; 18261da177e4SLinus Torvalds } 18271da177e4SLinus Torvalds } 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds error = -ENOMEM; 1830b522412aSAl Viro fat_inode = new_inode(sb); 1831b522412aSAl Viro if (!fat_inode) 1832b522412aSAl Viro goto out_fail; 1833c0d0e351SOGAWA Hirofumi fat_dummy_inode_init(fat_inode); 1834b522412aSAl Viro sbi->fat_inode = fat_inode; 1835020ac5b6SArtem Bityutskiy 1836020ac5b6SArtem Bityutskiy fsinfo_inode = new_inode(sb); 1837020ac5b6SArtem Bityutskiy if (!fsinfo_inode) 1838020ac5b6SArtem Bityutskiy goto out_fail; 1839c0d0e351SOGAWA Hirofumi fat_dummy_inode_init(fsinfo_inode); 1840020ac5b6SArtem Bityutskiy fsinfo_inode->i_ino = MSDOS_FSINFO_INO; 1841020ac5b6SArtem Bityutskiy sbi->fsinfo_inode = fsinfo_inode; 1842020ac5b6SArtem Bityutskiy insert_inode_hash(fsinfo_inode); 1843020ac5b6SArtem Bityutskiy 18441da177e4SLinus Torvalds root_inode = new_inode(sb); 18451da177e4SLinus Torvalds if (!root_inode) 18461da177e4SLinus Torvalds goto out_fail; 18471da177e4SLinus Torvalds root_inode->i_ino = MSDOS_ROOT_INO; 18482489dbabSJeff Layton inode_set_iversion(root_inode, 1); 18491da177e4SLinus Torvalds error = fat_read_root(root_inode); 18501688f860SAl Viro if (error < 0) { 18511688f860SAl Viro iput(root_inode); 18521da177e4SLinus Torvalds goto out_fail; 18531688f860SAl Viro } 18541da177e4SLinus Torvalds error = -ENOMEM; 18551da177e4SLinus Torvalds insert_inode_hash(root_inode); 18567669e8fbSSteven J. Magnani fat_attach(root_inode, 0); 18571688f860SAl Viro sb->s_root = d_make_root(root_inode); 18581da177e4SLinus Torvalds if (!sb->s_root) { 1859869f58c0SAlexey Fisher fat_msg(sb, KERN_ERR, "get root inode failed"); 18601da177e4SLinus Torvalds goto out_fail; 18611da177e4SLinus Torvalds } 18621da177e4SLinus Torvalds 1863f562146aSNamjae Jeon if (sbi->options.discard) { 1864f562146aSNamjae Jeon struct request_queue *q = bdev_get_queue(sb->s_bdev); 1865f562146aSNamjae Jeon if (!blk_queue_discard(q)) 1866f562146aSNamjae Jeon fat_msg(sb, KERN_WARNING, 1867f562146aSNamjae Jeon "mounting with \"discard\" option, but " 1868f562146aSNamjae Jeon "the device does not support discard"); 1869f562146aSNamjae Jeon } 1870f562146aSNamjae Jeon 1871b88a1058SOleksij Rempel fat_set_state(sb, 1, 0); 18721da177e4SLinus Torvalds return 0; 18731da177e4SLinus Torvalds 18741da177e4SLinus Torvalds out_invalid: 18751da177e4SLinus Torvalds error = -EINVAL; 18761da177e4SLinus Torvalds if (!silent) 1877869f58c0SAlexey Fisher fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds out_fail: 1880020ac5b6SArtem Bityutskiy if (fsinfo_inode) 1881020ac5b6SArtem Bityutskiy iput(fsinfo_inode); 1882b522412aSAl Viro if (fat_inode) 1883b522412aSAl Viro iput(fat_inode); 18841da177e4SLinus Torvalds unload_nls(sbi->nls_io); 18851da177e4SLinus Torvalds unload_nls(sbi->nls_disk); 188635033ab9SOGAWA Hirofumi fat_reset_iocharset(&sbi->options); 18871da177e4SLinus Torvalds sb->s_fs_info = NULL; 18881da177e4SLinus Torvalds kfree(sbi); 18891da177e4SLinus Torvalds return error; 18901da177e4SLinus Torvalds } 18911da177e4SLinus Torvalds 18927c709d00SOGAWA Hirofumi EXPORT_SYMBOL_GPL(fat_fill_super); 18931da177e4SLinus Torvalds 1894ae78bf9cSChris Mason /* 1895ae78bf9cSChris Mason * helper function for fat_flush_inodes. This writes both the inode 1896ae78bf9cSChris Mason * and the file data blocks, waiting for in flight data blocks before 1897ae78bf9cSChris Mason * the start of the call. It does not wait for any io started 1898ae78bf9cSChris Mason * during the call 1899ae78bf9cSChris Mason */ 1900ae78bf9cSChris Mason static int writeback_inode(struct inode *inode) 1901ae78bf9cSChris Mason { 1902ae78bf9cSChris Mason 1903ae78bf9cSChris Mason int ret; 190414864655SNamjae Jeon 190514864655SNamjae Jeon /* if we used wait=1, sync_inode_metadata waits for the io for the 190614864655SNamjae Jeon * inode to finish. So wait=0 is sent down to sync_inode_metadata 1907ae78bf9cSChris Mason * and filemap_fdatawrite is used for the data blocks 1908ae78bf9cSChris Mason */ 190914864655SNamjae Jeon ret = sync_inode_metadata(inode, 0); 1910ae78bf9cSChris Mason if (!ret) 191114864655SNamjae Jeon ret = filemap_fdatawrite(inode->i_mapping); 1912ae78bf9cSChris Mason return ret; 1913ae78bf9cSChris Mason } 1914ae78bf9cSChris Mason 1915ae78bf9cSChris Mason /* 1916ae78bf9cSChris Mason * write data and metadata corresponding to i1 and i2. The io is 1917ae78bf9cSChris Mason * started but we do not wait for any of it to finish. 1918ae78bf9cSChris Mason * 1919ae78bf9cSChris Mason * filemap_flush is used for the block device, so if there is a dirty 1920ae78bf9cSChris Mason * page for a block already in flight, we will not wait and start the 1921ae78bf9cSChris Mason * io over again 1922ae78bf9cSChris Mason */ 1923ae78bf9cSChris Mason int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) 1924ae78bf9cSChris Mason { 1925ae78bf9cSChris Mason int ret = 0; 1926ae78bf9cSChris Mason if (!MSDOS_SB(sb)->options.flush) 1927ae78bf9cSChris Mason return 0; 1928ae78bf9cSChris Mason if (i1) 1929ae78bf9cSChris Mason ret = writeback_inode(i1); 1930ae78bf9cSChris Mason if (!ret && i2) 1931ae78bf9cSChris Mason ret = writeback_inode(i2); 193297e860d3SEric Sesterhenn if (!ret) { 1933ae78bf9cSChris Mason struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; 1934ae78bf9cSChris Mason ret = filemap_flush(mapping); 1935ae78bf9cSChris Mason } 1936ae78bf9cSChris Mason return ret; 1937ae78bf9cSChris Mason } 1938ae78bf9cSChris Mason EXPORT_SYMBOL_GPL(fat_flush_inodes); 1939ae78bf9cSChris Mason 19401da177e4SLinus Torvalds static int __init init_fat_fs(void) 19411da177e4SLinus Torvalds { 1942532a39a3SPekka J Enberg int err; 19431da177e4SLinus Torvalds 1944532a39a3SPekka J Enberg err = fat_cache_init(); 1945532a39a3SPekka J Enberg if (err) 1946532a39a3SPekka J Enberg return err; 1947532a39a3SPekka J Enberg 1948532a39a3SPekka J Enberg err = fat_init_inodecache(); 1949532a39a3SPekka J Enberg if (err) 1950532a39a3SPekka J Enberg goto failed; 1951532a39a3SPekka J Enberg 1952532a39a3SPekka J Enberg return 0; 1953532a39a3SPekka J Enberg 1954532a39a3SPekka J Enberg failed: 1955532a39a3SPekka J Enberg fat_cache_destroy(); 1956532a39a3SPekka J Enberg return err; 19571da177e4SLinus Torvalds } 19581da177e4SLinus Torvalds 19591da177e4SLinus Torvalds static void __exit exit_fat_fs(void) 19601da177e4SLinus Torvalds { 19611da177e4SLinus Torvalds fat_cache_destroy(); 19621da177e4SLinus Torvalds fat_destroy_inodecache(); 19631da177e4SLinus Torvalds } 19641da177e4SLinus Torvalds 19651da177e4SLinus Torvalds module_init(init_fat_fs) 19661da177e4SLinus Torvalds module_exit(exit_fat_fs) 19671da177e4SLinus Torvalds 19681da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1969