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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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jan Kara 2016-11-04 18:08:15 +01:00 • committed by Jens Axboe
commit e64855c6cf
10 changed files with 16 additions and 19 deletions
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2
fs/ntfs/aops.c
View file

@ -765,7 +765,7 @@ lock_retry_remap:
}
// TODO: Instantiate the hole.
// clear_buffer_new(bh);
// unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
// clean_bdev_bh_alias(bh);
ntfs_error(vol->sb, "Writing into sparse regions is "
"not supported yet. Sorry.");
err = -EOPNOTSUPP;

5
fs/ntfs/file.c
View file

@ -740,8 +740,7 @@ map_buffer_cached:
set_buffer_uptodate(bh);
if (unlikely(was_hole)) {
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
clean_bdev_bh_alias(bh);
if (bh_end <= pos || bh_pos >= end)
mark_buffer_dirty(bh);
else
@ -784,7 +783,7 @@ map_buffer_cached:
continue;
}
/* We allocated the buffer. */
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
clean_bdev_bh_alias(bh);
/*
* If the buffer is fully outside the write, zero it,
* set it uptodate, and mark it dirty so it gets