mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 08:01:59 +00:00
cf12445dae
Use a more descriptive explanation of the @opf function parameter,
more in line with <linux/blk_types.h>.
Fixes: 02105f18a2
("fs/hfsplus: wrapper.c: fix kernel-doc warnings")
Suggested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20240210050606.9182-1-rdunlap@infradead.org
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
267 lines
7.0 KiB
C
267 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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 <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;
|
|
};
|
|
|
|
/**
|
|
* hfsplus_submit_bio - Perform block I/O
|
|
* @sb: super block of volume for I/O
|
|
* @sector: block to read or write, for blocks of HFSPLUS_SECTOR_SIZE bytes
|
|
* @buf: buffer for I/O
|
|
* @data: output pointer for location of requested data
|
|
* @opf: I/O operation type and flags
|
|
*
|
|
* The unit of I/O is hfsplus_min_io_size(sb), which may be bigger than
|
|
* HFSPLUS_SECTOR_SIZE, and @buf must be sized accordingly. On reads
|
|
* @data will return a pointer to the start of the requested sector,
|
|
* which may not be the same location as @buf.
|
|
*
|
|
* If @sector is not aligned to the bdev logical block size it will
|
|
* be rounded down. For writes this means that @buf should contain data
|
|
* that starts at the rounded-down address. As long as the data was
|
|
* read using hfsplus_submit_bio() and the same buffer is used things
|
|
* will work correctly.
|
|
*
|
|
* Returns: %0 on success else -errno code
|
|
*/
|
|
int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
|
|
void *buf, void **data, blk_opf_t opf)
|
|
{
|
|
const enum req_op op = opf & REQ_OP_MASK;
|
|
struct bio *bio;
|
|
int ret = 0;
|
|
u64 io_size;
|
|
loff_t start;
|
|
int offset;
|
|
|
|
/*
|
|
* Align sector to hardware sector size and find offset. We
|
|
* assume that io_size is a power of two, which _should_
|
|
* be true.
|
|
*/
|
|
io_size = hfsplus_min_io_size(sb);
|
|
start = (loff_t)sector << HFSPLUS_SECTOR_SHIFT;
|
|
offset = start & (io_size - 1);
|
|
sector &= ~((io_size >> HFSPLUS_SECTOR_SHIFT) - 1);
|
|
|
|
bio = bio_alloc(sb->s_bdev, 1, opf, GFP_NOIO);
|
|
bio->bi_iter.bi_sector = sector;
|
|
|
|
if (op != REQ_OP_WRITE && data)
|
|
*data = (u8 *)buf + offset;
|
|
|
|
while (io_size > 0) {
|
|
unsigned int page_offset = offset_in_page(buf);
|
|
unsigned int len = min_t(unsigned int, PAGE_SIZE - page_offset,
|
|
io_size);
|
|
|
|
ret = bio_add_page(bio, virt_to_page(buf), len, page_offset);
|
|
if (ret != len) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
io_size -= len;
|
|
buf = (u8 *)buf + len;
|
|
}
|
|
|
|
ret = submit_bio_wait(bio);
|
|
out:
|
|
bio_put(bio);
|
|
return ret < 0 ? ret : 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_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
|
|
|
|
/* default values */
|
|
*start = 0;
|
|
*size = bdev_nr_sectors(sb->s_bdev);
|
|
|
|
if (HFSPLUS_SB(sb)->session >= 0) {
|
|
struct cdrom_tocentry te;
|
|
|
|
if (!cdi)
|
|
return -EINVAL;
|
|
|
|
te.cdte_track = HFSPLUS_SB(sb)->session;
|
|
te.cdte_format = CDROM_LBA;
|
|
if (cdrom_read_tocentry(cdi, &te) ||
|
|
(te.cdte_ctrl & CDROM_DATA_TRACK) != 4) {
|
|
pr_err("invalid session number or type of track\n");
|
|
return -EINVAL;
|
|
}
|
|
*start = (sector_t)te.cdte_addr.lba << 2;
|
|
} else if (cdi) {
|
|
struct cdrom_multisession ms_info;
|
|
|
|
ms_info.addr_format = CDROM_LBA;
|
|
if (cdrom_multisession(cdi, &ms_info) == 0 && 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;
|
|
|
|
error = -ENOMEM;
|
|
sbi->s_vhdr_buf = kmalloc(hfsplus_min_io_size(sb), GFP_KERNEL);
|
|
if (!sbi->s_vhdr_buf)
|
|
goto out;
|
|
sbi->s_backup_vhdr_buf = kmalloc(hfsplus_min_io_size(sb), GFP_KERNEL);
|
|
if (!sbi->s_backup_vhdr_buf)
|
|
goto out_free_vhdr;
|
|
|
|
reread:
|
|
error = hfsplus_submit_bio(sb, part_start + HFSPLUS_VOLHEAD_SECTOR,
|
|
sbi->s_vhdr_buf, (void **)&sbi->s_vhdr,
|
|
REQ_OP_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);
|
|
fallthrough;
|
|
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 += (sector_t)wd.ablk_start +
|
|
(sector_t)wd.embed_start * wd.ablk_size;
|
|
part_size = (sector_t)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, part_start + part_size - 2,
|
|
sbi->s_backup_vhdr_buf,
|
|
(void **)&sbi->s_backup_vhdr, REQ_OP_READ);
|
|
if (error)
|
|
goto out_free_backup_vhdr;
|
|
|
|
error = -EINVAL;
|
|
if (sbi->s_backup_vhdr->signature != sbi->s_vhdr->signature) {
|
|
pr_warn("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 = ilog2(blocksize);
|
|
blocksize = min_t(u32, sbi->alloc_blksz, 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) {
|
|
pr_err("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_buf);
|
|
out_free_vhdr:
|
|
kfree(sbi->s_vhdr_buf);
|
|
out:
|
|
return error;
|
|
}
|