^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * linux/fs/hfs/mdb.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 1995-1997 Paul H. Hargrove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * (C) 2003 Ardis Technologies <roman@ardistech.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * This file may be distributed under the terms of the GNU General Public License.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This file contains functions for reading/writing the MDB.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/cdrom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/genhd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/nls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "hfs_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "btree.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /*================ File-local data types ================*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * The HFS Master Directory Block (MDB).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Also known as the Volume Information Block (VIB), this structure is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * the HFS equivalent of a superblock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Reference: _Inside Macintosh: Files_ pages 2-59 through 2-62
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * modified for HFS Extended
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static int hfs_get_last_session(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) sector_t *start, sector_t *size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* default values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) *start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *size = i_size_read(sb->s_bdev->bd_inode) >> 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (HFS_SB(sb)->session >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct cdrom_tocentry te;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (!cdi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) te.cdte_track = HFS_SB(sb)->session;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) te.cdte_format = CDROM_LBA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (cdrom_read_tocentry(cdi, &te) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) (te.cdte_ctrl & CDROM_DATA_TRACK) != 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) pr_err("invalid session number or type of track\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) *start = (sector_t)te.cdte_addr.lba << 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) } else if (cdi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct cdrom_multisession ms_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ms_info.addr_format = CDROM_LBA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (cdrom_multisession(cdi, &ms_info) == 0 && ms_info.xa_flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) *start = (sector_t)ms_info.addr.lba << 2;
^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) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * hfs_mdb_get()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * Build the in-core MDB for a filesystem, including
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * the B-trees and the volume bitmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int hfs_mdb_get(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct hfs_mdb *mdb, *mdb2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) unsigned int block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) int off2, len, size, sect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) sector_t part_start, part_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) loff_t off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) __be16 attrib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) /* set the device driver to 512-byte blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) size = sb_min_blocksize(sb, HFS_SECTOR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (hfs_get_last_session(sb, &part_start, &part_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* See if this is an HFS filesystem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) bh = sb_bread512(sb, part_start + HFS_MDB_BLK, mdb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (mdb->drSigWord == cpu_to_be16(HFS_SUPER_MAGIC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* check for a partition block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * (should do this only for cdrom/loop though)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (hfs_part_find(sb, &part_start, &part_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) HFS_SB(sb)->alloc_blksz = size = be32_to_cpu(mdb->drAlBlkSiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (!size || (size & (HFS_SECTOR_SIZE - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) pr_err("bad allocation block size %d\n", size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) goto out_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) size = min(HFS_SB(sb)->alloc_blksz, (u32)PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* size must be a multiple of 512 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) while (size & (size - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) size -= HFS_SECTOR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) sect = be16_to_cpu(mdb->drAlBlSt) + part_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* align block size to first sector */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) while (sect & ((size - 1) >> HFS_SECTOR_SIZE_BITS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) size >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /* align block size to weird alloc size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) while (HFS_SB(sb)->alloc_blksz & (size - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) size >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!sb_set_blocksize(sb, size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) pr_err("unable to set blocksize to %u\n", size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) bh = sb_bread512(sb, part_start + HFS_MDB_BLK, mdb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (mdb->drSigWord != cpu_to_be16(HFS_SUPER_MAGIC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) goto out_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) HFS_SB(sb)->mdb_bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) HFS_SB(sb)->mdb = mdb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* These parameters are read from the MDB, and never written */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) HFS_SB(sb)->part_start = part_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) HFS_SB(sb)->fs_ablocks = be16_to_cpu(mdb->drNmAlBlks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) HFS_SB(sb)->fs_div = HFS_SB(sb)->alloc_blksz >> sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) HFS_SB(sb)->clumpablks = be32_to_cpu(mdb->drClpSiz) /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) HFS_SB(sb)->alloc_blksz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (!HFS_SB(sb)->clumpablks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) HFS_SB(sb)->clumpablks = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) HFS_SB(sb)->fs_start = (be16_to_cpu(mdb->drAlBlSt) + part_start) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) (sb->s_blocksize_bits - HFS_SECTOR_SIZE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* These parameters are read from and written to the MDB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) HFS_SB(sb)->free_ablocks = be16_to_cpu(mdb->drFreeBks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) HFS_SB(sb)->next_id = be32_to_cpu(mdb->drNxtCNID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) HFS_SB(sb)->root_files = be16_to_cpu(mdb->drNmFls);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) HFS_SB(sb)->root_dirs = be16_to_cpu(mdb->drNmRtDirs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) HFS_SB(sb)->file_count = be32_to_cpu(mdb->drFilCnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) HFS_SB(sb)->folder_count = be32_to_cpu(mdb->drDirCnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* TRY to get the alternate (backup) MDB. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) sect = part_start + part_size - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) bh = sb_bread512(sb, sect, mdb2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (mdb2->drSigWord == cpu_to_be16(HFS_SUPER_MAGIC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) HFS_SB(sb)->alt_mdb_bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) HFS_SB(sb)->alt_mdb = mdb2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (!HFS_SB(sb)->alt_mdb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) pr_warn("unable to locate alternate MDB\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) pr_warn("continuing without an alternate MDB\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) HFS_SB(sb)->bitmap = kmalloc(8192, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (!HFS_SB(sb)->bitmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* read in the bitmap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) block = be16_to_cpu(mdb->drVBMSt) + part_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) off = (loff_t)block << HFS_SECTOR_SIZE_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) size = (HFS_SB(sb)->fs_ablocks + 8) / 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) ptr = (u8 *)HFS_SB(sb)->bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) while (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) bh = sb_bread(sb, off >> sb->s_blocksize_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) pr_err("unable to read volume bitmap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) off2 = off & (sb->s_blocksize - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) len = min((int)sb->s_blocksize - off2, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) memcpy(ptr, bh->b_data + off2, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) ptr += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) off += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) size -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) HFS_SB(sb)->ext_tree = hfs_btree_open(sb, HFS_EXT_CNID, hfs_ext_keycmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (!HFS_SB(sb)->ext_tree) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) pr_err("unable to open extent tree\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) HFS_SB(sb)->cat_tree = hfs_btree_open(sb, HFS_CAT_CNID, hfs_cat_keycmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (!HFS_SB(sb)->cat_tree) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) pr_err("unable to open catalog tree\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) attrib = mdb->drAtrb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (!(attrib & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. mounting read-only.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) sb->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if ((attrib & cpu_to_be16(HFS_SB_ATTRIB_SLOCK))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) pr_warn("filesystem is marked locked, mounting read-only.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) sb->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (!sb_rdonly(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* Mark the volume uncleanly unmounted in case we crash */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) attrib &= cpu_to_be16(~HFS_SB_ATTRIB_UNMNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) attrib |= cpu_to_be16(HFS_SB_ATTRIB_INCNSTNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) mdb->drAtrb = attrib;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) be32_add_cpu(&mdb->drWrCnt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) mdb->drLsMod = hfs_mtime();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) mark_buffer_dirty(HFS_SB(sb)->mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) sync_dirty_buffer(HFS_SB(sb)->mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) out_bh:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) hfs_mdb_put(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * hfs_mdb_commit()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * This updates the MDB on disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * It does not check, if the superblock has been modified, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * if the filesystem has been mounted read-only. It is mainly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * called by hfs_sync_fs() and flush_mdb().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * Input Variable(s):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * struct hfs_mdb *mdb: Pointer to the hfs MDB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * int backup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * Output Variable(s):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * NONE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * Preconditions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * 'mdb' points to a "valid" (struct hfs_mdb).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * Postconditions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * The HFS MDB and on disk will be updated, by copying the possibly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * modified fields from the in memory MDB (in native byte order) to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * the disk block buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * If 'backup' is non-zero then the alternate MDB is also written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * and the function doesn't return until it is actually on disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) void hfs_mdb_commit(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct hfs_mdb *mdb = HFS_SB(sb)->mdb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (sb_rdonly(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) lock_buffer(HFS_SB(sb)->mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (test_and_clear_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) /* These parameters may have been modified, so write them back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) mdb->drLsMod = hfs_mtime();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) mdb->drFreeBks = cpu_to_be16(HFS_SB(sb)->free_ablocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) mdb->drNxtCNID = cpu_to_be32(HFS_SB(sb)->next_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) mdb->drNmFls = cpu_to_be16(HFS_SB(sb)->root_files);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) mdb->drNmRtDirs = cpu_to_be16(HFS_SB(sb)->root_dirs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) mdb->drFilCnt = cpu_to_be32(HFS_SB(sb)->file_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) mdb->drDirCnt = cpu_to_be32(HFS_SB(sb)->folder_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* write MDB to disk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) mark_buffer_dirty(HFS_SB(sb)->mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) /* write the backup MDB, not returning until it is written.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * we only do this when either the catalog or extents overflow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * files grow. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (test_and_clear_bit(HFS_FLG_ALT_MDB_DIRTY, &HFS_SB(sb)->flags) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) HFS_SB(sb)->alt_mdb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) hfs_inode_write_fork(HFS_SB(sb)->ext_tree->inode, mdb->drXTExtRec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) &mdb->drXTFlSize, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) hfs_inode_write_fork(HFS_SB(sb)->cat_tree->inode, mdb->drCTExtRec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) &mdb->drCTFlSize, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) lock_buffer(HFS_SB(sb)->alt_mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) memcpy(HFS_SB(sb)->alt_mdb, HFS_SB(sb)->mdb, HFS_SECTOR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) HFS_SB(sb)->alt_mdb->drAtrb |= cpu_to_be16(HFS_SB_ATTRIB_UNMNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) HFS_SB(sb)->alt_mdb->drAtrb &= cpu_to_be16(~HFS_SB_ATTRIB_INCNSTNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) unlock_buffer(HFS_SB(sb)->alt_mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) mark_buffer_dirty(HFS_SB(sb)->alt_mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) sync_dirty_buffer(HFS_SB(sb)->alt_mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (test_and_clear_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) sector_t block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) int off, size, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) block = be16_to_cpu(HFS_SB(sb)->mdb->drVBMSt) + HFS_SB(sb)->part_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) off = (block << HFS_SECTOR_SIZE_BITS) & (sb->s_blocksize - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) block >>= sb->s_blocksize_bits - HFS_SECTOR_SIZE_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) size = (HFS_SB(sb)->fs_ablocks + 7) / 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) ptr = (u8 *)HFS_SB(sb)->bitmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) while (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) bh = sb_bread(sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (!bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) pr_err("unable to read volume bitmap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) len = min((int)sb->s_blocksize - off, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) lock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) memcpy(bh->b_data + off, ptr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) unlock_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) mark_buffer_dirty(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) block++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) off = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) ptr += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) size -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) unlock_buffer(HFS_SB(sb)->mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) void hfs_mdb_close(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /* update volume attributes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (sb_rdonly(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) HFS_SB(sb)->mdb->drAtrb |= cpu_to_be16(HFS_SB_ATTRIB_UNMNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) HFS_SB(sb)->mdb->drAtrb &= cpu_to_be16(~HFS_SB_ATTRIB_INCNSTNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) mark_buffer_dirty(HFS_SB(sb)->mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * hfs_mdb_put()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * Release the resources associated with the in-core MDB. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) void hfs_mdb_put(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (!HFS_SB(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /* free the B-trees */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) hfs_btree_close(HFS_SB(sb)->ext_tree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) hfs_btree_close(HFS_SB(sb)->cat_tree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* free the buffers holding the primary and alternate MDBs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) brelse(HFS_SB(sb)->mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) brelse(HFS_SB(sb)->alt_mdb_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) unload_nls(HFS_SB(sb)->nls_io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) unload_nls(HFS_SB(sb)->nls_disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) kfree(HFS_SB(sb)->bitmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) kfree(HFS_SB(sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) sb->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags