^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/fat/inode.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written 1992,1993 by Werner Almesberger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Rewritten for the constant inumbers support by Al Viro
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Fixes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mpage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/vfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/uio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/backing-dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/iversion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include "fat.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /* if user don't select VFAT, this is undefined. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define CONFIG_FAT_DEFAULT_IOCHARSET ""
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define KB_IN_SECTORS 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* DOS dates from 1980/1/1 through 2107/12/31 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define FAT_DATE_MIN (0<<9 | 1<<5 | 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define FAT_DATE_MAX (127<<9 | 12<<5 | 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define FAT_TIME_MAX (23<<11 | 59<<5 | 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * A deserialized copy of the on-disk structure laid out in struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * fat_boot_sector.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct fat_bios_param_block {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) u16 fat_sector_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) u8 fat_sec_per_clus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) u16 fat_reserved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) u8 fat_fats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) u16 fat_dir_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) u16 fat_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) u16 fat_fat_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) u32 fat_total_sect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) u8 fat16_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) u32 fat16_vol_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) u32 fat32_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) u32 fat32_root_cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) u16 fat32_info_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) u8 fat32_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) u32 fat32_vol_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static struct fat_floppy_defaults {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) unsigned nr_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) unsigned sec_per_clus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) unsigned dir_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) unsigned media;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned fat_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) } floppy_defaults[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .nr_sectors = 160 * KB_IN_SECTORS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .sec_per_clus = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .dir_entries = 64,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .media = 0xFE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .fat_length = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) .nr_sectors = 180 * KB_IN_SECTORS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) .sec_per_clus = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .dir_entries = 64,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .media = 0xFC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) .fat_length = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .nr_sectors = 320 * KB_IN_SECTORS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .sec_per_clus = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) .dir_entries = 112,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .media = 0xFF,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .fat_length = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .nr_sectors = 360 * KB_IN_SECTORS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .sec_per_clus = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .dir_entries = 112,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .media = 0xFD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .fat_length = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) int fat_add_cluster(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int err, cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) err = fat_alloc_clusters(inode, &cluster, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /* FIXME: this cluster should be added after data of this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * cluster is writed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) err = fat_chain_add(inode, cluster, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) fat_free_clusters(inode, cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static inline int __fat_get_block(struct inode *inode, sector_t iblock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) unsigned long *max_blocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct buffer_head *bh_result, int create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) unsigned long mapped_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) sector_t phys, last_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) int err, offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (phys) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) map_bh(bh_result, sb, phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) *max_blocks = min(mapped_blocks, *max_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) last_block = inode->i_blocks >> (sb->s_blocksize_bits - 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) offset = (unsigned long)iblock & (sbi->sec_per_clus - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * allocate a cluster according to the following.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * 1) no more available blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * 2) not part of fallocate region
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!offset && !(iblock < last_block)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* TODO: multiple cluster allocation would be desirable. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) err = fat_add_cluster(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* available blocks on this cluster */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) mapped_blocks = sbi->sec_per_clus - offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) *max_blocks = min(mapped_blocks, *max_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) if (!phys) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) fat_fs_error(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) "invalid FAT chain (i_pos %lld, last_block %llu)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MSDOS_I(inode)->i_pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) (unsigned long long)last_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) BUG_ON(*max_blocks != mapped_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) set_buffer_new(bh_result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) map_bh(bh_result, sb, phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static int fat_get_block(struct inode *inode, sector_t iblock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct buffer_head *bh_result, int create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) err = __fat_get_block(inode, iblock, &max_blocks, bh_result, create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) bh_result->b_size = max_blocks << sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static int fat_writepage(struct page *page, struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return block_write_full_page(page, fat_get_block, wbc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static int fat_writepages(struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) return mpage_writepages(mapping, wbc, fat_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static int fat_readpage(struct file *file, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return mpage_readpage(page, fat_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static void fat_readahead(struct readahead_control *rac)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) mpage_readahead(rac, fat_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static void fat_write_failed(struct address_space *mapping, loff_t to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct inode *inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (to > inode->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) truncate_pagecache(inode, inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) fat_truncate_blocks(inode, inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static int fat_write_begin(struct file *file, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) loff_t pos, unsigned len, unsigned flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct page **pagep, void **fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) *pagep = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) err = cont_write_begin(file, mapping, pos, len, flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) pagep, fsdata, fat_get_block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) &MSDOS_I(mapping->host)->mmu_private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) fat_write_failed(mapping, pos + len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static int fat_write_end(struct file *file, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) loff_t pos, unsigned len, unsigned copied,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) struct page *pagep, void *fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) struct inode *inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (err < len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) fat_write_failed(mapping, pos + len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static ssize_t fat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) struct file *file = iocb->ki_filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) struct address_space *mapping = file->f_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) struct inode *inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) size_t count = iov_iter_count(iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) loff_t offset = iocb->ki_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (iov_iter_rw(iter) == WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * so we need to update the ->mmu_private to block boundary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * But we must fill the remaining area or hole by nul for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * updating ->mmu_private.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * Return 0, and fallback to normal buffered write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) loff_t size = offset + count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (MSDOS_I(inode)->mmu_private < size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * FAT need to use the DIO_LOCKING for avoiding the race
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * condition of fat_get_block() and ->truncate().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) ret = blockdev_direct_IO(iocb, inode, iter, fat_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (ret < 0 && iov_iter_rw(iter) == WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) fat_write_failed(mapping, offset + count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static int fat_get_block_bmap(struct inode *inode, sector_t iblock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) struct buffer_head *bh_result, int create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) sector_t bmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) unsigned long mapped_blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) BUG_ON(create != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) err = fat_bmap(inode, iblock, &bmap, &mapped_blocks, create, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (bmap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) map_bh(bh_result, sb, bmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) max_blocks = min(mapped_blocks, max_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) bh_result->b_size = max_blocks << sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) sector_t blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /* fat_get_cluster() assumes the requested blocknr isn't truncated. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) down_read(&MSDOS_I(mapping->host)->truncate_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) blocknr = generic_block_bmap(mapping, block, fat_get_block_bmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) up_read(&MSDOS_I(mapping->host)->truncate_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * fat_block_truncate_page() zeroes out a mapping from file offset `from'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * up to the end of the block which corresponds to `from'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * This is required during truncate to physically zeroout the tail end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * of that block so it doesn't yield old data if the file is later grown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * Also, avoid causing failure from fsx for cases of "data past EOF"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) int fat_block_truncate_page(struct inode *inode, loff_t from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) return block_truncate_page(inode->i_mapping, from, fat_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static const struct address_space_operations fat_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) .readpage = fat_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) .readahead = fat_readahead,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) .writepage = fat_writepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) .writepages = fat_writepages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) .write_begin = fat_write_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) .write_end = fat_write_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) .direct_IO = fat_direct_IO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) .bmap = _fat_bmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * New FAT inode stuff. We do the following:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * a) i_ino is constant and has nothing with on-disk location.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * b) FAT manages its own cache of directory entries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * c) *This* cache is indexed by on-disk location.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) * d) inode has an associated directory entry, all right, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * it may be unhashed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * e) currently entries are stored within struct inode. That should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) * change.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * f) we deal with races in the following way:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) * 1. readdir() and lookup() do FAT-dir-cache lookup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * 2. rename() unhashes the F-d-c entry and rehashes it in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * a new place.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * 3. unlink() and rmdir() unhash F-d-c entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * 4. fat_write_inode() checks whether the thing is unhashed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) * If it is we silently return. If it isn't we do bread(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * check if the location is still valid and retry if it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * isn't. Otherwise we do changes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * 5. Spinlock is used to protect hash/unhash/location check/lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * 6. fat_evict_inode() unhashes the F-d-c entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * and consider negative result as cache miss.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static void fat_hash_init(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) spin_lock_init(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) for (i = 0; i < FAT_HASH_SIZE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) static inline unsigned long fat_hash(loff_t i_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) return hash_32(i_pos, FAT_HASH_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) static void dir_hash_init(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) spin_lock_init(&sbi->dir_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) for (i = 0; i < FAT_HASH_SIZE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) INIT_HLIST_HEAD(&sbi->dir_hashtable[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) void fat_attach(struct inode *inode, loff_t i_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (inode->i_ino != MSDOS_ROOT_INO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct hlist_head *head = sbi->inode_hashtable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) + fat_hash(i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) spin_lock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) MSDOS_I(inode)->i_pos = i_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) spin_unlock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /* If NFS support is enabled, cache the mapping of start cluster
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * to directory inode. This is used during reconnection of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * dentries to the filesystem root.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) if (S_ISDIR(inode->i_mode) && sbi->options.nfs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct hlist_head *d_head = sbi->dir_hashtable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) spin_lock(&sbi->dir_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) spin_unlock(&sbi->dir_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) EXPORT_SYMBOL_GPL(fat_attach);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) void fat_detach(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) spin_lock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) MSDOS_I(inode)->i_pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) spin_unlock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (S_ISDIR(inode->i_mode) && sbi->options.nfs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) spin_lock(&sbi->dir_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) hlist_del_init(&MSDOS_I(inode)->i_dir_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) spin_unlock(&sbi->dir_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) EXPORT_SYMBOL_GPL(fat_detach);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) struct msdos_inode_info *i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) struct inode *inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) spin_lock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) hlist_for_each_entry(i, head, i_fat_hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) BUG_ON(i->vfs_inode.i_sb != sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (i->i_pos != i_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) inode = igrab(&i->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) spin_unlock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static int is_exec(unsigned char *extension)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) unsigned char exe_extensions[] = "EXECOMBAT", *walk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) for (walk = exe_extensions; *walk; walk += 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (!strncmp(extension, walk, 3))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) static int fat_calc_dir_size(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) int ret, fclus, dclus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) inode->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (MSDOS_I(inode)->i_start == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) inode->i_size = (fclus + 1) << sbi->cluster_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) static int fat_validate_dir(struct inode *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) struct super_block *sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (dir->i_nlink < 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) /* Directory should have "."/".." entries at least. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) fat_fs_error(sb, "corrupted directory (invalid entries)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (MSDOS_I(dir)->i_start == 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) MSDOS_I(dir)->i_start == MSDOS_SB(sb)->root_cluster) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) /* Directory should point valid cluster. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) fat_fs_error(sb, "corrupted directory (invalid i_start)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) /* doesn't deal with root inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) MSDOS_I(inode)->i_pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) inode->i_uid = sbi->options.fs_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) inode->i_gid = sbi->options.fs_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) inode_inc_iversion(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) inode->i_generation = prandom_u32();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) inode->i_generation &= ~1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) inode->i_op = sbi->dir_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) inode->i_fop = &fat_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) MSDOS_I(inode)->i_start = fat_get_start(sbi, de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) error = fat_calc_dir_size(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) MSDOS_I(inode)->mmu_private = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) set_nlink(inode, fat_subdirs(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) error = fat_validate_dir(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) } else { /* not a directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) inode->i_generation |= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) inode->i_mode = fat_make_mode(sbi, de->attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ((sbi->options.showexec && !is_exec(de->name + 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) ? S_IRUGO|S_IWUGO : S_IRWXUGO));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) MSDOS_I(inode)->i_start = fat_get_start(sbi, de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) inode->i_size = le32_to_cpu(de->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) inode->i_op = &fat_file_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) inode->i_fop = &fat_file_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) inode->i_mapping->a_ops = &fat_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) MSDOS_I(inode)->mmu_private = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) if (de->attr & ATTR_SYS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (sbi->options.sys_immutable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) inode->i_flags |= S_IMMUTABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) fat_save_attrs(inode, de->attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) & ~((loff_t)sbi->cluster_size - 1)) >> 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) if (sbi->options.isvfat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) de->cdate, de->ctime_cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) fat_truncate_time(inode, &inode->i_mtime, S_ATIME|S_CTIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) static inline void fat_lock_build_inode(struct msdos_sb_info *sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) mutex_lock(&sbi->nfs_build_inode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) mutex_unlock(&sbi->nfs_build_inode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) struct inode *fat_build_inode(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) struct msdos_dir_entry *de, loff_t i_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) fat_lock_build_inode(MSDOS_SB(sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) inode = fat_iget(sb, i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) if (inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) inode = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) if (!inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) inode = ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) inode->i_ino = iunique(sb, MSDOS_ROOT_INO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) inode_set_iversion(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) err = fat_fill_inode(inode, de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) inode = ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) fat_attach(inode, i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) insert_inode_hash(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) fat_unlock_build_inode(MSDOS_SB(sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) EXPORT_SYMBOL_GPL(fat_build_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) static int __fat_write_inode(struct inode *inode, int wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) static void fat_free_eofblocks(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) /* Release unwritten fallocated blocks on inode eviction. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if ((inode->i_blocks << 9) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) round_up(MSDOS_I(inode)->mmu_private,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) MSDOS_SB(inode->i_sb)->cluster_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) fat_truncate_blocks(inode, MSDOS_I(inode)->mmu_private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) /* Fallocate results in updating the i_start/iogstart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * for the zero byte file. So, make it return to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) * original state during evict and commit it to avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * any corruption on the next access to the cluster
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) * chain for the file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) err = __fat_write_inode(inode, inode_needs_sync(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) fat_msg(inode->i_sb, KERN_WARNING, "Failed to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) "update on disk inode for unused "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) "fallocated blocks, inode could be "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) "corrupted. Please run fsck");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) static void fat_evict_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) truncate_inode_pages_final(&inode->i_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (!inode->i_nlink) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) inode->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) fat_truncate_blocks(inode, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) fat_free_eofblocks(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) invalidate_inode_buffers(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) clear_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) fat_cache_inval_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) fat_detach(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) static void fat_set_state(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) unsigned int set, unsigned int force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) struct fat_boot_sector *b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) /* do not change any thing if mounted read only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) if (sb_rdonly(sb) && !force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) /* do not change state if fs was dirty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) if (sbi->dirty) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) /* warn only on set (mount). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) fat_msg(sb, KERN_WARNING, "Volume was not properly "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) "unmounted. Some data may be corrupt. "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) "Please run fsck.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) bh = sb_bread(sb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) if (bh == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) fat_msg(sb, KERN_ERR, "unable to read boot sector "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) "to mark fs as dirty");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) b = (struct fat_boot_sector *) bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) if (is_fat32(sbi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) if (set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) b->fat32.state |= FAT_STATE_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) b->fat32.state &= ~FAT_STATE_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) } else /* fat 16 and 12 */ {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) if (set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) b->fat16.state |= FAT_STATE_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) b->fat16.state &= ~FAT_STATE_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) mark_buffer_dirty(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) sync_dirty_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) static void fat_reset_iocharset(struct fat_mount_options *opts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) if (opts->iocharset != fat_default_iocharset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) /* Note: opts->iocharset can be NULL here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) kfree(opts->iocharset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) opts->iocharset = fat_default_iocharset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) static void delayed_free(struct rcu_head *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) struct msdos_sb_info *sbi = container_of(p, struct msdos_sb_info, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) unload_nls(sbi->nls_disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) unload_nls(sbi->nls_io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) fat_reset_iocharset(&sbi->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) kfree(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) static void fat_put_super(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) fat_set_state(sb, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) iput(sbi->fsinfo_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) iput(sbi->fat_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) call_rcu(&sbi->rcu, delayed_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) static struct kmem_cache *fat_inode_cachep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) static struct inode *fat_alloc_inode(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) struct msdos_inode_info *ei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) if (!ei)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) init_rwsem(&ei->truncate_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) /* Zeroing to allow iput() even if partial initialized inode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) ei->mmu_private = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) ei->i_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) ei->i_logstart = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) ei->i_attrs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) ei->i_pos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) return &ei->vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) static void fat_free_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) kmem_cache_free(fat_inode_cachep, MSDOS_I(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) static void init_once(void *foo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) struct msdos_inode_info *ei = (struct msdos_inode_info *)foo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) spin_lock_init(&ei->cache_lru_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) ei->nr_caches = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) ei->cache_valid_id = FAT_CACHE_VALID + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) INIT_LIST_HEAD(&ei->cache_lru);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) INIT_HLIST_NODE(&ei->i_fat_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) INIT_HLIST_NODE(&ei->i_dir_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) inode_init_once(&ei->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) static int __init fat_init_inodecache(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) fat_inode_cachep = kmem_cache_create("fat_inode_cache",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) sizeof(struct msdos_inode_info),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) 0, (SLAB_RECLAIM_ACCOUNT|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) SLAB_MEM_SPREAD|SLAB_ACCOUNT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) init_once);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) if (fat_inode_cachep == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) static void __exit fat_destroy_inodecache(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) * Make sure all delayed rcu free inodes are flushed before we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) * destroy cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) rcu_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) kmem_cache_destroy(fat_inode_cachep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) static int fat_remount(struct super_block *sb, int *flags, char *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) bool new_rdonly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) *flags |= SB_NODIRATIME | (sbi->options.isvfat ? 0 : SB_NOATIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) sync_filesystem(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) /* make sure we update state on remount. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) new_rdonly = *flags & SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) if (new_rdonly != sb_rdonly(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) if (new_rdonly)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) fat_set_state(sb, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) fat_set_state(sb, 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) struct super_block *sb = dentry->d_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) /* If the count of free cluster is still unknown, counts it here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (sbi->free_clusters == -1 || !sbi->free_clus_valid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) int err = fat_count_free_clusters(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) buf->f_type = dentry->d_sb->s_magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) buf->f_bsize = sbi->cluster_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) buf->f_blocks = sbi->max_cluster - FAT_START_ENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) buf->f_bfree = sbi->free_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) buf->f_bavail = sbi->free_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) buf->f_fsid = u64_to_fsid(id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) buf->f_namelen =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) (sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) static int __fat_write_inode(struct inode *inode, int wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) struct msdos_dir_entry *raw_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) loff_t i_pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) sector_t blocknr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) int err, offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) if (inode->i_ino == MSDOS_ROOT_INO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) i_pos = fat_i_pos_read(sbi, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) if (!i_pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) fat_get_blknr_offset(sbi, i_pos, &blocknr, &offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) bh = sb_bread(sb, blocknr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) fat_msg(sb, KERN_ERR, "unable to read inode block "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) "for updating (i_pos %lld)", i_pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) spin_lock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (i_pos != MSDOS_I(inode)->i_pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) spin_unlock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) raw_entry = &((struct msdos_dir_entry *) (bh->b_data))[offset];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) if (S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) raw_entry->size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) raw_entry->size = cpu_to_le32(inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) raw_entry->attr = fat_make_attrs(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) &raw_entry->date, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (sbi->options.isvfat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) __le16 atime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) &raw_entry->cdate, &raw_entry->ctime_cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) fat_time_unix2fat(sbi, &inode->i_atime, &atime,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) &raw_entry->adate, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) spin_unlock(&sbi->inode_hash_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) mark_buffer_dirty(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) if (wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) err = sync_dirty_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) static int fat_write_inode(struct inode *inode, struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) if (inode->i_ino == MSDOS_FSINFO_INO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) mutex_lock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) err = fat_clusters_flush(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) mutex_unlock(&MSDOS_SB(sb)->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) int fat_sync_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) return __fat_write_inode(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) EXPORT_SYMBOL_GPL(fat_sync_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) static int fat_show_options(struct seq_file *m, struct dentry *root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) static const struct super_operations fat_sops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) .alloc_inode = fat_alloc_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) .free_inode = fat_free_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) .write_inode = fat_write_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) .evict_inode = fat_evict_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) .put_super = fat_put_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) .statfs = fat_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) .remount_fs = fat_remount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) .show_options = fat_show_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) static int fat_show_options(struct seq_file *m, struct dentry *root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) struct fat_mount_options *opts = &sbi->options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) int isvfat = opts->isvfat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) seq_printf(m, ",uid=%u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) from_kuid_munged(&init_user_ns, opts->fs_uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) seq_printf(m, ",gid=%u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) from_kgid_munged(&init_user_ns, opts->fs_gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) seq_printf(m, ",fmask=%04o", opts->fs_fmask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) seq_printf(m, ",dmask=%04o", opts->fs_dmask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) if (opts->allow_utime)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) seq_printf(m, ",allow_utime=%04o", opts->allow_utime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) if (sbi->nls_disk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) /* strip "cp" prefix from displayed option */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) seq_printf(m, ",codepage=%s", &sbi->nls_disk->charset[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) if (isvfat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) if (sbi->nls_io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) switch (opts->shortname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) seq_puts(m, ",shortname=win95");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) seq_puts(m, ",shortname=winnt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) seq_puts(m, ",shortname=mixed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) seq_puts(m, ",shortname=lower");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) seq_puts(m, ",shortname=unknown");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) if (opts->name_check != 'n')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) seq_printf(m, ",check=%c", opts->name_check);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) if (opts->usefree)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) seq_puts(m, ",usefree");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) if (opts->quiet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) seq_puts(m, ",quiet");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) if (opts->showexec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) seq_puts(m, ",showexec");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) if (opts->sys_immutable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) seq_puts(m, ",sys_immutable");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) if (!isvfat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) if (opts->dotsOK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) seq_puts(m, ",dotsOK=yes");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) if (opts->nocase)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) seq_puts(m, ",nocase");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) if (opts->utf8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) seq_puts(m, ",utf8");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) if (opts->unicode_xlate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) seq_puts(m, ",uni_xlate");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) if (!opts->numtail)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) seq_puts(m, ",nonumtail");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) if (opts->rodir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) seq_puts(m, ",rodir");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if (opts->flush)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) seq_puts(m, ",flush");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) if (opts->tz_set) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) if (opts->time_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) seq_printf(m, ",time_offset=%d", opts->time_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) seq_puts(m, ",tz=UTC");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) if (opts->errors == FAT_ERRORS_CONT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) seq_puts(m, ",errors=continue");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) else if (opts->errors == FAT_ERRORS_PANIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) seq_puts(m, ",errors=panic");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) seq_puts(m, ",errors=remount-ro");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) if (opts->nfs == FAT_NFS_NOSTALE_RO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) seq_puts(m, ",nfs=nostale_ro");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) else if (opts->nfs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) seq_puts(m, ",nfs=stale_rw");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) if (opts->discard)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) seq_puts(m, ",discard");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) if (opts->dos1xfloppy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) seq_puts(m, ",dos1xfloppy");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) Opt_immutable, Opt_dots, Opt_nodots,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err, Opt_dos1xfloppy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) static const match_table_t fat_tokens = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) {Opt_check_r, "check=relaxed"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) {Opt_check_s, "check=strict"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) {Opt_check_n, "check=normal"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) {Opt_check_r, "check=r"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) {Opt_check_s, "check=s"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) {Opt_check_n, "check=n"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) {Opt_uid, "uid=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) {Opt_gid, "gid=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) {Opt_umask, "umask=%o"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) {Opt_dmask, "dmask=%o"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) {Opt_fmask, "fmask=%o"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) {Opt_allow_utime, "allow_utime=%o"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) {Opt_codepage, "codepage=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) {Opt_usefree, "usefree"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) {Opt_nocase, "nocase"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) {Opt_quiet, "quiet"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) {Opt_showexec, "showexec"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) {Opt_debug, "debug"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) {Opt_immutable, "sys_immutable"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) {Opt_flush, "flush"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) {Opt_tz_utc, "tz=UTC"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) {Opt_time_offset, "time_offset=%d"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) {Opt_err_cont, "errors=continue"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) {Opt_err_panic, "errors=panic"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) {Opt_err_ro, "errors=remount-ro"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) {Opt_discard, "discard"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) {Opt_nfs_stale_rw, "nfs"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) {Opt_nfs_stale_rw, "nfs=stale_rw"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) {Opt_nfs_nostale_ro, "nfs=nostale_ro"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) {Opt_dos1xfloppy, "dos1xfloppy"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) {Opt_obsolete, "conv=binary"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) {Opt_obsolete, "conv=text"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) {Opt_obsolete, "conv=auto"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) {Opt_obsolete, "conv=b"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) {Opt_obsolete, "conv=t"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) {Opt_obsolete, "conv=a"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) {Opt_obsolete, "fat=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) {Opt_obsolete, "blocksize=%u"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) {Opt_obsolete, "cvf_format=%20s"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) {Opt_obsolete, "cvf_options=%100s"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) {Opt_obsolete, "posix"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) {Opt_err, NULL},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) static const match_table_t msdos_tokens = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) {Opt_nodots, "nodots"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) {Opt_nodots, "dotsOK=no"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) {Opt_dots, "dots"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) {Opt_dots, "dotsOK=yes"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) {Opt_err, NULL}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) static const match_table_t vfat_tokens = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) {Opt_charset, "iocharset=%s"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) {Opt_shortname_lower, "shortname=lower"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) {Opt_shortname_win95, "shortname=win95"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) {Opt_shortname_winnt, "shortname=winnt"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) {Opt_shortname_mixed, "shortname=mixed"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) {Opt_utf8_no, "utf8=no"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) {Opt_utf8_no, "utf8=false"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) {Opt_utf8_yes, "utf8=yes"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) {Opt_utf8_yes, "utf8=true"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) {Opt_utf8_yes, "utf8"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) {Opt_uni_xl_no, "uni_xlate=no"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) {Opt_uni_xl_no, "uni_xlate=false"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) {Opt_uni_xl_yes, "uni_xlate=yes"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) {Opt_uni_xl_yes, "uni_xlate=true"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) {Opt_uni_xl_yes, "uni_xlate"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) {Opt_nonumtail_no, "nonumtail=no"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) {Opt_nonumtail_no, "nonumtail=false"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) {Opt_nonumtail_yes, "nonumtail=yes"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) {Opt_nonumtail_yes, "nonumtail=true"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) {Opt_nonumtail_yes, "nonumtail"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) {Opt_rodir, "rodir"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) {Opt_err, NULL}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) static int parse_options(struct super_block *sb, char *options, int is_vfat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) int silent, int *debug, struct fat_mount_options *opts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) substring_t args[MAX_OPT_ARGS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) int option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) char *iocharset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) opts->isvfat = is_vfat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) opts->fs_uid = current_uid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) opts->fs_gid = current_gid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) opts->fs_fmask = opts->fs_dmask = current_umask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) opts->allow_utime = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) opts->codepage = fat_default_codepage;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) fat_reset_iocharset(opts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) if (is_vfat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) opts->rodir = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) opts->shortname = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) opts->rodir = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) opts->name_check = 'n';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) opts->unicode_xlate = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) opts->numtail = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) opts->usefree = opts->nocase = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) opts->tz_set = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) opts->nfs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) opts->errors = FAT_ERRORS_RO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) *debug = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) opts->utf8 = IS_ENABLED(CONFIG_FAT_DEFAULT_UTF8) && is_vfat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) if (!options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) while ((p = strsep(&options, ",")) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) int token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) if (!*p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) token = match_token(p, fat_tokens, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) if (token == Opt_err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) if (is_vfat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) token = match_token(p, vfat_tokens, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) token = match_token(p, msdos_tokens, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) switch (token) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) case Opt_check_s:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) opts->name_check = 's';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) case Opt_check_r:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) opts->name_check = 'r';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) case Opt_check_n:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) opts->name_check = 'n';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) case Opt_usefree:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) opts->usefree = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) case Opt_nocase:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) if (!is_vfat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) opts->nocase = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) /* for backward compatibility */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) opts->shortname = VFAT_SFN_DISPLAY_WIN95
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) | VFAT_SFN_CREATE_WIN95;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) case Opt_quiet:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) opts->quiet = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) case Opt_showexec:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) opts->showexec = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) case Opt_debug:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) *debug = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) case Opt_immutable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) opts->sys_immutable = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) case Opt_uid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) if (match_int(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) opts->fs_uid = make_kuid(current_user_ns(), option);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) if (!uid_valid(opts->fs_uid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) case Opt_gid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) if (match_int(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) opts->fs_gid = make_kgid(current_user_ns(), option);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) if (!gid_valid(opts->fs_gid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) case Opt_umask:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) if (match_octal(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) opts->fs_fmask = opts->fs_dmask = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) case Opt_dmask:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) if (match_octal(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) opts->fs_dmask = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) case Opt_fmask:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) if (match_octal(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) opts->fs_fmask = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) case Opt_allow_utime:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) if (match_octal(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) opts->allow_utime = option & (S_IWGRP | S_IWOTH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) case Opt_codepage:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) if (match_int(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) opts->codepage = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) case Opt_flush:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) opts->flush = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) case Opt_time_offset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) if (match_int(&args[0], &option))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) * GMT+-12 zones may have DST corrections so at least
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) * 13 hours difference is needed. Make the limit 24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) * just in case someone invents something unusual.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) if (option < -24 * 60 || option > 24 * 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) opts->tz_set = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) opts->time_offset = option;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) case Opt_tz_utc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) opts->tz_set = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) opts->time_offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) case Opt_err_cont:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) opts->errors = FAT_ERRORS_CONT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) case Opt_err_panic:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) opts->errors = FAT_ERRORS_PANIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) case Opt_err_ro:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) opts->errors = FAT_ERRORS_RO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) case Opt_nfs_stale_rw:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) opts->nfs = FAT_NFS_STALE_RW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) case Opt_nfs_nostale_ro:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) opts->nfs = FAT_NFS_NOSTALE_RO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) case Opt_dos1xfloppy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) opts->dos1xfloppy = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) /* msdos specific */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) case Opt_dots:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) opts->dotsOK = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) case Opt_nodots:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) opts->dotsOK = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) /* vfat specific */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) case Opt_charset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) fat_reset_iocharset(opts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) iocharset = match_strdup(&args[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) if (!iocharset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) opts->iocharset = iocharset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) case Opt_shortname_lower:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) opts->shortname = VFAT_SFN_DISPLAY_LOWER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) | VFAT_SFN_CREATE_WIN95;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) case Opt_shortname_win95:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) opts->shortname = VFAT_SFN_DISPLAY_WIN95
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) | VFAT_SFN_CREATE_WIN95;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) case Opt_shortname_winnt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) opts->shortname = VFAT_SFN_DISPLAY_WINNT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) | VFAT_SFN_CREATE_WINNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) case Opt_shortname_mixed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) opts->shortname = VFAT_SFN_DISPLAY_WINNT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) | VFAT_SFN_CREATE_WIN95;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) case Opt_utf8_no: /* 0 or no or false */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) opts->utf8 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) case Opt_utf8_yes: /* empty or 1 or yes or true */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) opts->utf8 = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) case Opt_uni_xl_no: /* 0 or no or false */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) opts->unicode_xlate = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) case Opt_uni_xl_yes: /* empty or 1 or yes or true */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) opts->unicode_xlate = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) case Opt_nonumtail_no: /* 0 or no or false */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) opts->numtail = 1; /* negated option */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) case Opt_nonumtail_yes: /* empty or 1 or yes or true */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) opts->numtail = 0; /* negated option */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) case Opt_rodir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) opts->rodir = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) case Opt_discard:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) opts->discard = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) /* obsolete mount options */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) case Opt_obsolete:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) "not supported now", p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) /* unknown option */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) if (!silent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) fat_msg(sb, KERN_ERR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) "Unrecognized mount option \"%s\" "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) "or missing value", p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) /* UTF-8 doesn't provide FAT semantics */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) if (!strcmp(opts->iocharset, "utf8")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) " for FAT filesystems, filesystem will be "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) "case sensitive!");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) /* If user doesn't specify allow_utime, it's initialized from dmask. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) if (opts->allow_utime == (unsigned short)-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) if (opts->unicode_xlate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) opts->utf8 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) if (opts->nfs == FAT_NFS_NOSTALE_RO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) sb->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) sb->s_export_op = &fat_export_ops_nostale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) static int fat_read_root(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) MSDOS_I(inode)->i_pos = MSDOS_ROOT_INO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) inode->i_uid = sbi->options.fs_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) inode->i_gid = sbi->options.fs_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) inode_inc_iversion(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) inode->i_generation = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) inode->i_op = sbi->dir_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) inode->i_fop = &fat_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) if (is_fat32(sbi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) MSDOS_I(inode)->i_start = sbi->root_cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) error = fat_calc_dir_size(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) MSDOS_I(inode)->i_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) & ~((loff_t)sbi->cluster_size - 1)) >> 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) MSDOS_I(inode)->i_logstart = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) MSDOS_I(inode)->mmu_private = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) fat_save_attrs(inode, ATTR_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) set_nlink(inode, fat_subdirs(inode)+2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) static unsigned long calc_fat_clusters(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) struct msdos_sb_info *sbi = MSDOS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) /* Divide first to avoid overflow */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) if (!is_fat12(sbi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) return ent_per_sec * sbi->fat_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) static bool fat_bpb_is_zero(struct fat_boot_sector *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) if (get_unaligned_le16(&b->sector_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) if (b->sec_per_clus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) if (b->reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) if (b->fats)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) if (get_unaligned_le16(&b->dir_entries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) if (get_unaligned_le16(&b->sectors))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) if (b->media)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) if (b->fat_length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) if (b->secs_track)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) if (b->heads)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) int silent, struct fat_bios_param_block *bpb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) int error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) /* Read in BPB ... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) memset(bpb, 0, sizeof(*bpb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) bpb->fat_sector_size = get_unaligned_le16(&b->sector_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) bpb->fat_sec_per_clus = b->sec_per_clus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) bpb->fat_reserved = le16_to_cpu(b->reserved);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) bpb->fat_fats = b->fats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) bpb->fat_dir_entries = get_unaligned_le16(&b->dir_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) bpb->fat_sectors = get_unaligned_le16(&b->sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) bpb->fat_fat_length = le16_to_cpu(b->fat_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) bpb->fat_total_sect = le32_to_cpu(b->total_sect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) bpb->fat16_state = b->fat16.state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) bpb->fat16_vol_id = get_unaligned_le32(b->fat16.vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) bpb->fat32_length = le32_to_cpu(b->fat32.length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) bpb->fat32_root_cluster = le32_to_cpu(b->fat32.root_cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) bpb->fat32_info_sector = le16_to_cpu(b->fat32.info_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) bpb->fat32_state = b->fat32.state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) bpb->fat32_vol_id = get_unaligned_le32(b->fat32.vol_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) /* Validate this looks like a FAT filesystem BPB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) if (!bpb->fat_reserved) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) fat_msg(sb, KERN_ERR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) "bogus number of reserved sectors");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) if (!bpb->fat_fats) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) fat_msg(sb, KERN_ERR, "bogus number of FAT structure");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) * Earlier we checked here that b->secs_track and b->head are nonzero,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) * but it turns out valid FAT filesystems can have zero there.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) if (!fat_valid_media(b->media)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) (unsigned)b->media);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) if (!is_power_of_2(bpb->fat_sector_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) || (bpb->fat_sector_size < 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) || (bpb->fat_sector_size > 4096)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) fat_msg(sb, KERN_ERR, "bogus logical sector size %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) (unsigned)bpb->fat_sector_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) if (!is_power_of_2(bpb->fat_sec_per_clus)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) (unsigned)bpb->fat_sec_per_clus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) if (bpb->fat_fat_length == 0 && bpb->fat32_length == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) fat_msg(sb, KERN_ERR, "bogus number of FAT sectors");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) static int fat_read_static_bpb(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) struct fat_boot_sector *b, int silent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) struct fat_bios_param_block *bpb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) static const char *notdos1x = "This doesn't look like a DOS 1.x volume";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) struct fat_floppy_defaults *fdefaults = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) int error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) sector_t bd_sects;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) unsigned i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) bd_sects = i_size_read(sb->s_bdev->bd_inode) / SECTOR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) /* 16-bit DOS 1.x reliably wrote bootstrap short-jmp code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) if (b->ignored[0] != 0xeb || b->ignored[2] != 0x90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) fat_msg(sb, KERN_ERR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) "%s; no bootstrapping code", notdos1x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) * If any value in this region is non-zero, it isn't archaic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) * DOS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) if (!fat_bpb_is_zero(b)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) fat_msg(sb, KERN_ERR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) "%s; DOS 2.x BPB is non-zero", notdos1x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) for (i = 0; i < ARRAY_SIZE(floppy_defaults); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) if (floppy_defaults[i].nr_sectors == bd_sects) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) fdefaults = &floppy_defaults[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) if (fdefaults == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) fat_msg(sb, KERN_WARNING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) "This looks like a DOS 1.x volume, but isn't a recognized floppy size (%llu sectors)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) (u64)bd_sects);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) fat_msg(sb, KERN_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) "This looks like a DOS 1.x volume; assuming default BPB values");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) memset(bpb, 0, sizeof(*bpb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) bpb->fat_sector_size = SECTOR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) bpb->fat_sec_per_clus = fdefaults->sec_per_clus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) bpb->fat_reserved = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) bpb->fat_fats = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) bpb->fat_dir_entries = fdefaults->dir_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) bpb->fat_sectors = fdefaults->nr_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) bpb->fat_fat_length = fdefaults->fat_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) * Read the super block of an MS-DOS FS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) void (*setup)(struct super_block *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) struct inode *root_inode = NULL, *fat_inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) struct inode *fsinfo_inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) struct fat_bios_param_block bpb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) struct msdos_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) u16 logical_sector_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) int debug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) long error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) char buf[50];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) struct timespec64 ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) * GFP_KERNEL is ok here, because while we do hold the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) * superblock lock, memory pressure can't call back into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) * the filesystem, since we're only just about to mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) * it and have no inodes etc active!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) sbi = kzalloc(sizeof(struct msdos_sb_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) if (!sbi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) sb->s_fs_info = sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) sb->s_flags |= SB_NODIRATIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) sb->s_magic = MSDOS_SUPER_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) sb->s_op = &fat_sops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) sb->s_export_op = &fat_export_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) * fat timestamps are complex and truncated by fat itself, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) * we set 1 here to be fast
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) sb->s_time_gran = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) mutex_init(&sbi->nfs_build_inode_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) DEFAULT_RATELIMIT_BURST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) setup(sb); /* flavour-specific stuff that needs options */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) error = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) sb_min_blocksize(sb, 512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) bh = sb_bread(sb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) if (bh == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) fat_msg(sb, KERN_ERR, "unable to read boot sector");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) error = fat_read_bpb(sb, (struct fat_boot_sector *)bh->b_data, silent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) &bpb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) if (error == -EINVAL && sbi->options.dos1xfloppy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) error = fat_read_static_bpb(sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) (struct fat_boot_sector *)bh->b_data, silent, &bpb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) if (error == -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) goto out_invalid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) else if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) logical_sector_size = bpb.fat_sector_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) sbi->sec_per_clus = bpb.fat_sec_per_clus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) error = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) if (logical_sector_size < sb->s_blocksize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) fat_msg(sb, KERN_ERR, "logical sector size too small for device"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) " (logical sector size = %u)", logical_sector_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) if (logical_sector_size > sb->s_blocksize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) struct buffer_head *bh_resize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) if (!sb_set_blocksize(sb, logical_sector_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) fat_msg(sb, KERN_ERR, "unable to set blocksize %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) logical_sector_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) /* Verify that the larger boot sector is fully readable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) bh_resize = sb_bread(sb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) if (bh_resize == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) fat_msg(sb, KERN_ERR, "unable to read boot sector"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) " (logical sector size = %lu)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) brelse(bh_resize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) mutex_init(&sbi->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) sbi->cluster_bits = ffs(sbi->cluster_size) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) sbi->fats = bpb.fat_fats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) sbi->fat_bits = 0; /* Don't know yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) sbi->fat_start = bpb.fat_reserved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) sbi->fat_length = bpb.fat_fat_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) sbi->root_cluster = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) sbi->free_clusters = -1; /* Don't know yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) sbi->free_clus_valid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) sbi->prev_free = FAT_START_ENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) sb->s_maxbytes = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) fat_time_fat2unix(sbi, &ts, 0, cpu_to_le16(FAT_DATE_MIN), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) sb->s_time_min = ts.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) fat_time_fat2unix(sbi, &ts, cpu_to_le16(FAT_TIME_MAX),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) cpu_to_le16(FAT_DATE_MAX), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) sb->s_time_max = ts.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) if (!sbi->fat_length && bpb.fat32_length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) struct fat_boot_fsinfo *fsinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) struct buffer_head *fsinfo_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) /* Must be FAT32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) sbi->fat_bits = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) sbi->fat_length = bpb.fat32_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) sbi->root_cluster = bpb.fat32_root_cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) /* MC - if info_sector is 0, don't multiply by 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) sbi->fsinfo_sector = bpb.fat32_info_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) if (sbi->fsinfo_sector == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) sbi->fsinfo_sector = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) if (fsinfo_bh == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) fat_msg(sb, KERN_ERR, "bread failed, FSINFO block"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) " (sector = %lu)", sbi->fsinfo_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) if (!IS_FSINFO(fsinfo)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) fat_msg(sb, KERN_WARNING, "Invalid FSINFO signature: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) "0x%08x, 0x%08x (sector = %lu)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) le32_to_cpu(fsinfo->signature1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) le32_to_cpu(fsinfo->signature2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) sbi->fsinfo_sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) if (sbi->options.usefree)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) sbi->free_clus_valid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) sbi->prev_free = le32_to_cpu(fsinfo->next_cluster);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) brelse(fsinfo_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) /* interpret volume ID as a little endian 32 bit integer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) if (is_fat32(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) sbi->vol_id = bpb.fat32_vol_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) else /* fat 16 or 12 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) sbi->vol_id = bpb.fat16_vol_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) sbi->dir_entries = bpb.fat_dir_entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) if (sbi->dir_entries & (sbi->dir_per_block - 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) fat_msg(sb, KERN_ERR, "bogus number of directory entries"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) " (%u)", sbi->dir_entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) goto out_invalid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) rootdir_sectors = sbi->dir_entries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) * sizeof(struct msdos_dir_entry) / sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) sbi->data_start = sbi->dir_start + rootdir_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) total_sectors = bpb.fat_sectors;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) if (total_sectors == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) total_sectors = bpb.fat_total_sect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) if (!is_fat32(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) /* some OSes set FAT_STATE_DIRTY and clean it on unmount. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) if (is_fat32(sbi))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) sbi->dirty = bpb.fat32_state & FAT_STATE_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) else /* fat 16 or 12 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) sbi->dirty = bpb.fat16_state & FAT_STATE_DIRTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) /* check that FAT table does not overflow */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) fat_clusters = calc_fat_clusters(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) if (total_clusters > max_fat(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) fat_msg(sb, KERN_ERR, "count of clusters too big (%u)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) total_clusters);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) goto out_invalid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) sbi->max_cluster = total_clusters + FAT_START_ENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) /* check the free_clusters, it's not necessarily correct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) sbi->free_clusters = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) /* check the prev_free, it's not necessarily correct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) sbi->prev_free %= sbi->max_cluster;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) if (sbi->prev_free < FAT_START_ENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) sbi->prev_free = FAT_START_ENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) /* set up enough so that it can read an inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) fat_hash_init(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) dir_hash_init(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) fat_ent_access_init(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) * The low byte of the first FAT entry must have the same value as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) * the media field of the boot sector. But in real world, too many
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817) * devices are writing wrong values. So, removed that validity check.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) * The removed check compared the first FAT entry to a value dependent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) * on the media field like this:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) * == (0x0F00 | media), for FAT12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) * == (0XFF00 | media), for FAT16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) * == (0x0FFFFF | media), for FAT32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) sprintf(buf, "cp%d", sbi->options.codepage);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) sbi->nls_disk = load_nls(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) if (!sbi->nls_disk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) fat_msg(sb, KERN_ERR, "codepage %s not found", buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) /* FIXME: utf8 is using iocharset for upper/lower conversion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) if (sbi->options.isvfat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) sbi->nls_io = load_nls(sbi->options.iocharset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) if (!sbi->nls_io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) fat_msg(sb, KERN_ERR, "IO charset %s not found",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) sbi->options.iocharset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) fat_inode = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) if (!fat_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) sbi->fat_inode = fat_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) fsinfo_inode = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) if (!fsinfo_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) fsinfo_inode->i_ino = MSDOS_FSINFO_INO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) sbi->fsinfo_inode = fsinfo_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) insert_inode_hash(fsinfo_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857) root_inode = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) if (!root_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) root_inode->i_ino = MSDOS_ROOT_INO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) inode_set_iversion(root_inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) error = fat_read_root(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) iput(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) insert_inode_hash(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) fat_attach(root_inode, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) sb->s_root = d_make_root(root_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) if (!sb->s_root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) fat_msg(sb, KERN_ERR, "get root inode failed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) if (sbi->options.discard) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) struct request_queue *q = bdev_get_queue(sb->s_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) if (!blk_queue_discard(q))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) fat_msg(sb, KERN_WARNING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) "mounting with \"discard\" option, but "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) "the device does not support discard");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) fat_set_state(sb, 1, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) out_invalid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) error = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889) if (!silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) out_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) if (fsinfo_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) iput(fsinfo_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) if (fat_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) iput(fat_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) unload_nls(sbi->nls_io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) unload_nls(sbi->nls_disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) fat_reset_iocharset(&sbi->options);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) sb->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) kfree(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) EXPORT_SYMBOL_GPL(fat_fill_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) * helper function for fat_flush_inodes. This writes both the inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) * and the file data blocks, waiting for in flight data blocks before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) * the start of the call. It does not wait for any io started
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) * during the call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) static int writeback_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) /* if we used wait=1, sync_inode_metadata waits for the io for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) * inode to finish. So wait=0 is sent down to sync_inode_metadata
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) * and filemap_fdatawrite is used for the data blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) ret = sync_inode_metadata(inode, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) ret = filemap_fdatawrite(inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) * write data and metadata corresponding to i1 and i2. The io is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) * started but we do not wait for any of it to finish.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) * filemap_flush is used for the block device, so if there is a dirty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933) * page for a block already in flight, we will not wait and start the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) * io over again
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) if (!MSDOS_SB(sb)->options.flush)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) if (i1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) ret = writeback_inode(i1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) if (!ret && i2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) ret = writeback_inode(i2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) ret = filemap_flush(mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951) EXPORT_SYMBOL_GPL(fat_flush_inodes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953) static int __init init_fat_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) err = fat_cache_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) err = fat_init_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) fat_cache_destroy();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) static void __exit exit_fat_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) fat_cache_destroy();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975) fat_destroy_inodecache();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) module_init(init_fat_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979) module_exit(exit_fat_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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