ext4: fix partial page writes
authorAllison Henderson <achender@linux.vnet.ibm.com>
Wed, 7 Sep 2011 01:53:01 +0000 (21:53 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Wed, 7 Sep 2011 01:53:01 +0000 (21:53 -0400)
commit02fac1297eb3f471a27368271aadd285548297b0
treed0008f0aa889dba759cb780e8e805b30953083cf
parent189e868fa8fdca702eb9db9d8afc46b5cb9144c9
ext4: fix partial page writes

While running extended fsx tests to verify the preceeding patches,
a similar bug was also found in the write operation

When ever a write operation begins or ends in a hole,
or extends EOF, the partial page contained in the hole
or beyond EOF needs to be zeroed out.

To correct this the new ext4_discard_partial_page_buffers_no_lock
routine is used to zero out the partial page, but only for buffer
heads that are already unmapped.

Signed-off-by: Allison Henderson <achender@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
fs/ext4/inode.c