eCryptfs: track header bytes rather than extents

Remove internal references to header extents; just keep track of header bytes
instead.  Headers can easily span multiple pages with the recent persistent
file changes.

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>

1 files changed, 3 insertions, 5 deletions

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index ed0ed849ee28..a2bc9df546bd 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -365,8 +365,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
                 dentry->d_sb)->mount_crypt_stat;
         if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
                 if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
-                        file_size = ((crypt_stat->extent_size
-                                      * crypt_stat->num_header_extents_at_front)
+                        file_size = (crypt_stat->num_header_bytes_at_front
                                      + i_size_read(lower_dentry->d_inode));
                 else
                         file_size = i_size_read(lower_dentry->d_inode);
@@ -685,7 +684,7 @@ ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
  * @crypt_stat: Crypt_stat associated with file
  * @upper_size: Size of the upper file
  *
- * Calculate the requried size of the lower file based on the
+ * Calculate the required size of the lower file based on the
  * specified size of the upper file. This calculation is based on the
  * number of headers in the underlying file and the extent size.
  *
@@ -697,8 +696,7 @@ upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
 {
         loff_t lower_size;
 
-        lower_size = (crypt_stat->extent_size
-                      * crypt_stat->num_header_extents_at_front);
+        lower_size = crypt_stat->num_header_bytes_at_front;
         if (upper_size != 0) {
                 loff_t num_extents;