mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Chuck Ebbert](/assets/img/avatar_default.png)
Signed-Off-By: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: Christoph Hellwig <hch@tuxera.com>
237 lines
5.8 KiB
C
237 lines
5.8 KiB
C
/*
|
|
* linux/fs/hfsplus/wrapper.c
|
|
*
|
|
* Copyright (C) 2001
|
|
* Brad Boyer (flar@allandria.com)
|
|
* (C) 2003 Ardis Technologies <roman@ardistech.com>
|
|
*
|
|
* Handling of HFS wrappers around HFS+ volumes
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/cdrom.h>
|
|
#include <linux/genhd.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#include "hfsplus_fs.h"
|
|
#include "hfsplus_raw.h"
|
|
|
|
struct hfsplus_wd {
|
|
u32 ablk_size;
|
|
u16 ablk_start;
|
|
u16 embed_start;
|
|
u16 embed_count;
|
|
};
|
|
|
|
static void hfsplus_end_io_sync(struct bio *bio, int err)
|
|
{
|
|
if (err)
|
|
clear_bit(BIO_UPTODATE, &bio->bi_flags);
|
|
complete(bio->bi_private);
|
|
}
|
|
|
|
int hfsplus_submit_bio(struct block_device *bdev, sector_t sector,
|
|
void *data, int rw)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(wait);
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc(GFP_NOIO, 1);
|
|
bio->bi_sector = sector;
|
|
bio->bi_bdev = bdev;
|
|
bio->bi_end_io = hfsplus_end_io_sync;
|
|
bio->bi_private = &wait;
|
|
|
|
/*
|
|
* We always submit one sector at a time, so bio_add_page must not fail.
|
|
*/
|
|
if (bio_add_page(bio, virt_to_page(data), HFSPLUS_SECTOR_SIZE,
|
|
offset_in_page(data)) != HFSPLUS_SECTOR_SIZE)
|
|
BUG();
|
|
|
|
submit_bio(rw, bio);
|
|
wait_for_completion(&wait);
|
|
|
|
if (!bio_flagged(bio, BIO_UPTODATE))
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd)
|
|
{
|
|
u32 extent;
|
|
u16 attrib;
|
|
__be16 sig;
|
|
|
|
sig = *(__be16 *)(bufptr + HFSP_WRAPOFF_EMBEDSIG);
|
|
if (sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIG) &&
|
|
sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIGX))
|
|
return 0;
|
|
|
|
attrib = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ATTRIB));
|
|
if (!(attrib & HFSP_WRAP_ATTRIB_SLOCK) ||
|
|
!(attrib & HFSP_WRAP_ATTRIB_SPARED))
|
|
return 0;
|
|
|
|
wd->ablk_size =
|
|
be32_to_cpu(*(__be32 *)(bufptr + HFSP_WRAPOFF_ABLKSIZE));
|
|
if (wd->ablk_size < HFSPLUS_SECTOR_SIZE)
|
|
return 0;
|
|
if (wd->ablk_size % HFSPLUS_SECTOR_SIZE)
|
|
return 0;
|
|
wd->ablk_start =
|
|
be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ABLKSTART));
|
|
|
|
extent = get_unaligned_be32(bufptr + HFSP_WRAPOFF_EMBEDEXT);
|
|
wd->embed_start = (extent >> 16) & 0xFFFF;
|
|
wd->embed_count = extent & 0xFFFF;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int hfsplus_get_last_session(struct super_block *sb,
|
|
sector_t *start, sector_t *size)
|
|
{
|
|
struct cdrom_multisession ms_info;
|
|
struct cdrom_tocentry te;
|
|
int res;
|
|
|
|
/* default values */
|
|
*start = 0;
|
|
*size = sb->s_bdev->bd_inode->i_size >> 9;
|
|
|
|
if (HFSPLUS_SB(sb)->session >= 0) {
|
|
te.cdte_track = HFSPLUS_SB(sb)->session;
|
|
te.cdte_format = CDROM_LBA;
|
|
res = ioctl_by_bdev(sb->s_bdev,
|
|
CDROMREADTOCENTRY, (unsigned long)&te);
|
|
if (!res && (te.cdte_ctrl & CDROM_DATA_TRACK) == 4) {
|
|
*start = (sector_t)te.cdte_addr.lba << 2;
|
|
return 0;
|
|
}
|
|
printk(KERN_ERR "hfs: invalid session number or type of track\n");
|
|
return -EINVAL;
|
|
}
|
|
ms_info.addr_format = CDROM_LBA;
|
|
res = ioctl_by_bdev(sb->s_bdev, CDROMMULTISESSION,
|
|
(unsigned long)&ms_info);
|
|
if (!res && ms_info.xa_flag)
|
|
*start = (sector_t)ms_info.addr.lba << 2;
|
|
return 0;
|
|
}
|
|
|
|
/* Find the volume header and fill in some minimum bits in superblock */
|
|
/* Takes in super block, returns true if good data read */
|
|
int hfsplus_read_wrapper(struct super_block *sb)
|
|
{
|
|
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
|
|
struct hfsplus_wd wd;
|
|
sector_t part_start, part_size;
|
|
u32 blocksize;
|
|
int error = 0;
|
|
|
|
error = -EINVAL;
|
|
blocksize = sb_min_blocksize(sb, HFSPLUS_SECTOR_SIZE);
|
|
if (!blocksize)
|
|
goto out;
|
|
|
|
if (hfsplus_get_last_session(sb, &part_start, &part_size))
|
|
goto out;
|
|
if ((u64)part_start + part_size > 0x100000000ULL) {
|
|
pr_err("hfs: volumes larger than 2TB are not supported yet\n");
|
|
goto out;
|
|
}
|
|
|
|
error = -ENOMEM;
|
|
sbi->s_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL);
|
|
if (!sbi->s_vhdr)
|
|
goto out;
|
|
sbi->s_backup_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL);
|
|
if (!sbi->s_backup_vhdr)
|
|
goto out_free_vhdr;
|
|
|
|
reread:
|
|
error = hfsplus_submit_bio(sb->s_bdev,
|
|
part_start + HFSPLUS_VOLHEAD_SECTOR,
|
|
sbi->s_vhdr, READ);
|
|
if (error)
|
|
goto out_free_backup_vhdr;
|
|
|
|
error = -EINVAL;
|
|
switch (sbi->s_vhdr->signature) {
|
|
case cpu_to_be16(HFSPLUS_VOLHEAD_SIGX):
|
|
set_bit(HFSPLUS_SB_HFSX, &sbi->flags);
|
|
/*FALLTHRU*/
|
|
case cpu_to_be16(HFSPLUS_VOLHEAD_SIG):
|
|
break;
|
|
case cpu_to_be16(HFSP_WRAP_MAGIC):
|
|
if (!hfsplus_read_mdb(sbi->s_vhdr, &wd))
|
|
goto out_free_backup_vhdr;
|
|
wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT;
|
|
part_start += wd.ablk_start + wd.embed_start * wd.ablk_size;
|
|
part_size = wd.embed_count * wd.ablk_size;
|
|
goto reread;
|
|
default:
|
|
/*
|
|
* Check for a partition block.
|
|
*
|
|
* (should do this only for cdrom/loop though)
|
|
*/
|
|
if (hfs_part_find(sb, &part_start, &part_size))
|
|
goto out_free_backup_vhdr;
|
|
goto reread;
|
|
}
|
|
|
|
error = hfsplus_submit_bio(sb->s_bdev,
|
|
part_start + part_size - 2,
|
|
sbi->s_backup_vhdr, READ);
|
|
if (error)
|
|
goto out_free_backup_vhdr;
|
|
|
|
error = -EINVAL;
|
|
if (sbi->s_backup_vhdr->signature != sbi->s_vhdr->signature) {
|
|
printk(KERN_WARNING
|
|
"hfs: invalid secondary volume header\n");
|
|
goto out_free_backup_vhdr;
|
|
}
|
|
|
|
blocksize = be32_to_cpu(sbi->s_vhdr->blocksize);
|
|
|
|
/*
|
|
* Block size must be at least as large as a sector and a multiple of 2.
|
|
*/
|
|
if (blocksize < HFSPLUS_SECTOR_SIZE || ((blocksize - 1) & blocksize))
|
|
goto out_free_backup_vhdr;
|
|
sbi->alloc_blksz = blocksize;
|
|
sbi->alloc_blksz_shift = 0;
|
|
while ((blocksize >>= 1) != 0)
|
|
sbi->alloc_blksz_shift++;
|
|
blocksize = min(sbi->alloc_blksz, (u32)PAGE_SIZE);
|
|
|
|
/*
|
|
* Align block size to block offset.
|
|
*/
|
|
while (part_start & ((blocksize >> HFSPLUS_SECTOR_SHIFT) - 1))
|
|
blocksize >>= 1;
|
|
|
|
if (sb_set_blocksize(sb, blocksize) != blocksize) {
|
|
printk(KERN_ERR "hfs: unable to set blocksize to %u!\n",
|
|
blocksize);
|
|
goto out_free_backup_vhdr;
|
|
}
|
|
|
|
sbi->blockoffset =
|
|
part_start >> (sb->s_blocksize_bits - HFSPLUS_SECTOR_SHIFT);
|
|
sbi->part_start = part_start;
|
|
sbi->sect_count = part_size;
|
|
sbi->fs_shift = sbi->alloc_blksz_shift - sb->s_blocksize_bits;
|
|
return 0;
|
|
|
|
out_free_backup_vhdr:
|
|
kfree(sbi->s_backup_vhdr);
|
|
out_free_vhdr:
|
|
kfree(sbi->s_vhdr);
|
|
out:
|
|
return error;
|
|
}
|