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Commit 7f1468d1 authored by Dmitry Monakhov's avatar Dmitry Monakhov Committed by Theodore Ts'o
Browse files

ext4: fix double unlock buffer mess during fs-resize 



bh_submit_read() is responsible for unlock bh on endio.  In addition,
we need to use bh_uptodate_or_lock() to avoid races.

Signed-off-by: default avatarDmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent f2a09af6

fs/ext4/resize.c

+5 −10
Original line number Diff line number Diff line
@@ -1181,17 +1181,12 @@ static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) 
	struct buffer_head *bh = sb_getblk(sb, block);

	if (!bh)

		return NULL;



	if (bitmap_uptodate(bh))

		return bh;



	lock_buffer(bh);

	if (!bh_uptodate_or_lock(bh)) {

		if (bh_submit_read(bh) < 0) {

		unlock_buffer(bh);

			brelse(bh);

			return NULL;

		}

	unlock_buffer(bh);

	}



	return bh;

}