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Commit 7c4c71ac authored by Chris Mason's avatar Chris Mason
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Revert "Btrfs: adjust len of writes if following a preallocated extent" 



This is exposing an existing deadlock between fsync and AIO.  Until we
have the deadlock fixed, I'm pulling this one out.

This reverts commit a23eaa87.

Signed-off-by: default avatarChris Mason <clm@fb.com>
parent e5d6b12f

fs/btrfs/inode.c

+3 −5
Original line number Diff line number Diff line
@@ -7765,12 +7765,10 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, 
	}



	/*

	 * this will cow the extent, if em is within [start, len], then

	 * probably we've found a preallocated/existing extent, let's

	 * give it a chance to use preallocated space.

	 * this will cow the extent, reset the len in case we changed

	 * it above

	 */

	len = min_t(u64, bh_result->b_size, em->len - (start - em->start));

	len = ALIGN(len, fs_info->sectorsize);

	len = bh_result->b_size;

	free_extent_map(em);

	em = btrfs_new_extent_direct(inode, start, len);

	if (IS_ERR(em)) {