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fs: Add helper to clean bdev aliases under a bh and use it

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Add a helper function that clears buffer heads from a block device
aliasing passed bh. Use this helper function from filesystems instead of
the original unmap_underlying_metadata() to save some boiler plate code
and also have a better name for the functionalily since it is not
unmapping anything for a *long* time.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara
2016-11-04 18:08:15 +01:00
committed by Jens Axboe
parent 69a9bea146
commit e64855c6cf
10 changed files with 16 additions and 19 deletions
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3
fs/ext4/inode.c
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@@ -1123,8 +1123,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
if (err)
break;
if (buffer_new(bh)) {
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
if (PageUptodate(page)) {
clear_buffer_new(bh);
set_buffer_uptodate(bh);