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author | Michael Halcrow <mhalcrow@us.ibm.com> | 2007-06-27 14:09:44 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-28 11:34:53 -0700 |
commit | 240e2df5c740d73fc08cac9989872212deb2d20e (patch) | |
tree | 538dc70281c5401f3843ac8c752b2092f79ba9ee /scripts | |
parent | b75ae8603568ae18f270213693758c78fb8a29ff (diff) | |
download | linux-3.10-240e2df5c740d73fc08cac9989872212deb2d20e.tar.gz linux-3.10-240e2df5c740d73fc08cac9989872212deb2d20e.tar.bz2 linux-3.10-240e2df5c740d73fc08cac9989872212deb2d20e.zip |
eCryptfs: fix write zeros behavior
This patch fixes the processes involved in wiping regions of the data during
truncate and write events, fixing a kernel hang in 2.6.22-rc4 while assuring
that zero values are written out to the appropriate locations during events in
which the i_size will change.
The range passed to ecryptfs_truncate() from ecryptfs_prepare_write() includes
the page that is the object of ecryptfs_prepare_write(). This leads to a
kernel hang as read_cache_page() is executed on the same page in the
ecryptfs_truncate() execution path. This patch remedies this by limiting the
range passed to ecryptfs_truncate() so as to exclude the page that is the
object of ecryptfs_prepare_write(); it also adds code to
ecryptfs_prepare_write() to zero out the region of its own page when writing
past the i_size position. This patch also modifies ecryptfs_truncate() so
that when a file is truncated to a smaller size, eCryptfs will zero out the
contents of the new last page from the new size through to the end of the last
page.
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions