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ext4: let ext4_discard_partial_buffers handle unaligned range correctly

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As comment says, we should handle unaligned range rather than aligned
one.  This fixes a bug found by running xfstests #91.

Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
This commit is contained in:
Yongqiang Yang
2011-10-31 18:04:38 -04:00
committed by Theodore Ts'o
parent 5129d05fda
commit edb5ac8993
1 changed files with 2 additions and 2 deletions
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4
fs/ext4/inode.c
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@@ -3206,8 +3206,8 @@ int ext4_discard_partial_page_buffers_no_lock(handle_t *handle,
* to be updated with the contents of the block before * to be updated with the contents of the block before
* we write the zeros on top of it. * we write the zeros on top of it.
*/ */
if (!(from & (blocksize - 1)) || if ((from & (blocksize - 1)) ||
!((from + length) & (blocksize - 1))) { ((from + length) & (blocksize - 1))) {
create_empty_buffers(page, blocksize, 0); create_empty_buffers(page, blocksize, 0);
} else { } else {
/* /*