ecryptfs: modify write path to encrypt page in writepage
Change the write path to encrypt the data only when the page is written to
disk in ecryptfs_writepage. Previously, ecryptfs encrypts the page in
ecryptfs_write_end which means that if there are multiple write requests to
the same page, ecryptfs ends up re-encrypting that page over and over again.
This patch minimizes the number of encryptions needed.
Signed-off-by: Thieu Le <thieule@chromium.org>
[tyhicks: Changed NULL .drop_inode sop pointer to generic_drop_inode]
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index db184ef..85d4309 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -44,15 +44,11 @@
ssize_t rc;
inode_info = ecryptfs_inode_to_private(ecryptfs_inode);
- mutex_lock(&inode_info->lower_file_mutex);
BUG_ON(!inode_info->lower_file);
- inode_info->lower_file->f_pos = offset;
fs_save = get_fs();
set_fs(get_ds());
- rc = vfs_write(inode_info->lower_file, data, size,
- &inode_info->lower_file->f_pos);
+ rc = vfs_write(inode_info->lower_file, data, size, &offset);
set_fs(fs_save);
- mutex_unlock(&inode_info->lower_file_mutex);
mark_inode_dirty_sync(ecryptfs_inode);
return rc;
}
@@ -234,15 +230,11 @@
mm_segment_t fs_save;
ssize_t rc;
- mutex_lock(&inode_info->lower_file_mutex);
BUG_ON(!inode_info->lower_file);
- inode_info->lower_file->f_pos = offset;
fs_save = get_fs();
set_fs(get_ds());
- rc = vfs_read(inode_info->lower_file, data, size,
- &inode_info->lower_file->f_pos);
+ rc = vfs_read(inode_info->lower_file, data, size, &offset);
set_fs(fs_save);
- mutex_unlock(&inode_info->lower_file_mutex);
return rc;
}