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ocfs2: ocfs2_write_begin_nolock() should handle len=0 

Bug introduced by mainline commit e7432675f8
The bug causes ocfs2_write_begin_nolock() to oops when len=0.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Sunil Mushran 2009-09-04 11:12:01 -07:00 committed by Joel Becker
parent a1b08e75df
commit 8379e7c46c
1 changed files with 2 additions and 2 deletions
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4
fs/ocfs2/aops.c
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@ -1747,8 +1747,8 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
* we know zeros will only be needed in the first and/or last cluster.
*/
if (clusters_to_alloc || extents_to_split ||
wc->w_desc[0].c_needs_zero ||
wc->w_desc[wc->w_clen - 1].c_needs_zero)
(wc->w_clen && (wc->w_desc[0].c_needs_zero ||
wc->w_desc[wc->w_clen - 1].c_needs_zero)))
cluster_of_pages = 1;
else
cluster_of_pages = 0;