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btrfs: stop using write_one_page in btrfs_scratch_superblock

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write_one_page is an awkward interface that expects the page locked and
->writepage to be implemented.  Replace that by zeroing the signature
bytes and synchronize the block device page using the proper bdev
helpers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2022-11-21 18:47:49 +01:00 committed by David Sterba
parent 0e0078f72b
commit 26ecf243e4
1 changed files with 8 additions and 9 deletions
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17
fs/btrfs/volumes.c
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@ -2018,23 +2018,22 @@ static void btrfs_scratch_superblock(struct btrfs_fs_info *fs_info,
struct block_device *bdev, int copy_num)
{
struct btrfs_super_block *disk_super;
struct page *page;
const size_t len = sizeof(disk_super->magic);
const u64 bytenr = btrfs_sb_offset(copy_num);
int ret;
disk_super = btrfs_read_dev_one_super(bdev, copy_num, false);
disk_super = btrfs_read_disk_super(bdev, bytenr, bytenr);
if (IS_ERR(disk_super))
return;
memset(&disk_super->magic, 0, sizeof(disk_super->magic));
page = virt_to_page(disk_super);
set_page_dirty(page);
lock_page(page);
/* write_on_page() unlocks the page */
ret = write_one_page(page);
memset(&disk_super->magic, 0, len);
folio_mark_dirty(virt_to_folio(disk_super));
btrfs_release_disk_super(disk_super);
ret = sync_blockdev_range(bdev, bytenr, bytenr + len - 1);
if (ret)
btrfs_warn(fs_info, "error clearing superblock number %d (%d)",
copy_num, ret);
btrfs_release_disk_super(disk_super);
}
void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,