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btrfs: use named constant for bdev blocksize

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Superblock is read and written using buffer heads, we need to set the
bdev blocksize. The magic constant has been hardcoded in several places,
so replace it with a named constant.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-06-16 01:48:05 +02:00
parent abbb3b8ebf
commit 9f6d251033
4 changed files with 20 additions and 11 deletions
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6
fs/btrfs/check-integrity.c
View File

@ -795,12 +795,12 @@ static int btrfsic_process_superblock_dev_mirror(
dev_bytenr = btrfs_sb_offset(superblock_mirror_num);
if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->commit_total_bytes)
return -1;
bh = __bread(superblock_bdev, dev_bytenr / 4096,
bh = __bread(superblock_bdev, dev_bytenr / BTRFS_BDEV_BLOCKSIZE,
BTRFS_SUPER_INFO_SIZE);
if (NULL == bh)
return -1;
super_tmp = (struct btrfs_super_block *)
(bh->b_data + (dev_bytenr & 4095));
(bh->b_data + (dev_bytenr & (BTRFS_BDEV_BLOCKSIZE - 1)));
if (btrfs_super_bytenr(super_tmp) != dev_bytenr ||
btrfs_super_magic(super_tmp) != BTRFS_MAGIC ||
@ -2758,7 +2758,7 @@ int btrfsic_submit_bh(int op, int op_flags, struct buffer_head *bh)
(op == REQ_OP_WRITE) && bh->b_size > 0) {
u64 dev_bytenr;
dev_bytenr = 4096 * bh->b_blocknr;
dev_bytenr = BTRFS_BDEV_BLOCKSIZE * bh->b_blocknr;
if (dev_state->state->print_mask &
BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
pr_info("submit_bh(op=0x%x,0x%x, blocknr=%llu (bytenr %llu), size=%zu, data=%p, bdev=%p)\n",

11
fs/btrfs/disk-io.c
View File

@ -2694,8 +2694,8 @@ int open_ctree(struct super_block *sb,
btrfs_init_balance(fs_info);
btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
sb->s_blocksize = 4096;
sb->s_blocksize_bits = blksize_bits(4096);
sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
btrfs_init_btree_inode(fs_info);
@ -3316,7 +3316,7 @@ int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
return -EINVAL;
bh = __bread(bdev, bytenr / 4096, BTRFS_SUPER_INFO_SIZE);
bh = __bread(bdev, bytenr / BTRFS_BDEV_BLOCKSIZE, BTRFS_SUPER_INFO_SIZE);
/*
* If we fail to read from the underlying devices, as of now
* the best option we have is to mark it EIO.
@ -3409,7 +3409,7 @@ static int write_dev_supers(struct btrfs_device *device,
btrfs_csum_final(crc, sb->csum);
/* One reference for us, and we leave it for the caller */
bh = __getblk(device->bdev, bytenr / 4096,
bh = __getblk(device->bdev, bytenr / BTRFS_BDEV_BLOCKSIZE,
BTRFS_SUPER_INFO_SIZE);
if (!bh) {
btrfs_err(device->fs_info,
@ -3468,7 +3468,8 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
device->commit_total_bytes)
break;
bh = __find_get_block(device->bdev, bytenr / 4096,
bh = __find_get_block(device->bdev,
bytenr / BTRFS_BDEV_BLOCKSIZE,
BTRFS_SUPER_INFO_SIZE);
if (!bh) {
errors++;

8
fs/btrfs/disk-io.h
View File

@ -25,6 +25,14 @@
#define BTRFS_SUPER_MIRROR_MAX 3
#define BTRFS_SUPER_MIRROR_SHIFT 12
/*
* Fixed blocksize for all devices, applies to specific ways of reading
* metadata like superblock. Must meet the set_blocksize requirements.
*
* Do not change.
*/
#define BTRFS_BDEV_BLOCKSIZE (4096)
enum btrfs_wq_endio_type {
BTRFS_WQ_ENDIO_DATA = 0,
BTRFS_WQ_ENDIO_METADATA = 1,

6
fs/btrfs/volumes.c
View File

@ -303,7 +303,7 @@ btrfs_get_bdev_and_sb(const char *device_path, fmode_t flags, void *holder,
if (flush)
filemap_write_and_wait((*bdev)->bd_inode->i_mapping);
ret = set_blocksize(*bdev, 4096);
ret = set_blocksize(*bdev, BTRFS_BDEV_BLOCKSIZE);
if (ret) {
blkdev_put(*bdev, flags);
goto error;
@ -2395,7 +2395,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
device->is_tgtdev_for_dev_replace = 0;
device->mode = FMODE_EXCL;
device->dev_stats_valid = 1;
set_blocksize(device->bdev, 4096);
set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
if (seeding_dev) {
sb->s_flags &= ~MS_RDONLY;
@ -2598,7 +2598,7 @@ int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
device->is_tgtdev_for_dev_replace = 1;
device->mode = FMODE_EXCL;
device->dev_stats_valid = 1;
set_blocksize(device->bdev, 4096);
set_blocksize(device->bdev, BTRFS_BDEV_BLOCKSIZE);
device->fs_devices = fs_info->fs_devices;
list_add(&device->dev_list, &fs_info->fs_devices->devices);
fs_info->fs_devices->num_devices++;