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authorMichael Halcrow <mhalcrow@us.ibm.com>2007-06-28 01:09:44 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-28 22:34:53 +0400
commit240e2df5c740d73fc08cac9989872212deb2d20e (patch)
tree538dc70281c5401f3843ac8c752b2092f79ba9ee /fs/ecryptfs/ecryptfs_kernel.h
parentb75ae8603568ae18f270213693758c78fb8a29ff (diff)
downloadlinux-240e2df5c740d73fc08cac9989872212deb2d20e.tar.xz
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 'fs/ecryptfs/ecryptfs_kernel.h')
-rw-r--r--fs/ecryptfs/ecryptfs_kernel.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 403e3bad1455..1b9dd9a96f19 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -580,5 +580,7 @@ void
ecryptfs_write_header_metadata(char *virt,
struct ecryptfs_crypt_stat *crypt_stat,
size_t *written);
+int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
+ int num_zeros);
#endif /* #ifndef ECRYPTFS_KERNEL_H */