Commit 5be79de2 authored Apr 22, 2011 by Tyler Hicks

eCryptfs: Flush dirty pages in setattr

After 57db4e8d changed eCryptfs to
write-back caching, eCryptfs page writeback updates the lower inode
times due to the use of vfs_write() on the lower file.

To preserve inode metadata changes, such as 'cp -p' does with
utimensat(), we need to flush all dirty pages early in
ecryptfs_setattr() so that the user-updated lower inode metadata isn't
clobbered later in writeback.

https://bugzilla.kernel.org/show_bug.cgi?id=33372



Reported-by: Rocko <rockorequin@hotmail.com>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>

parent 3aeb86ea

fs/ecryptfs/inode.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -929,6 +929,12 @@ static int ecryptfs_setattr(struct dentry dentry, struct iattr ia)
		}
		}
		mutex_unlock(&crypt_stat->cs_mutex);
		if (S_ISREG(inode->i_mode)) {
		rc = filemap_write_and_wait(inode->i_mapping);
		if (rc)
		goto out;
		fsstack_copy_attr_all(inode, lower_inode);
		}
		memcpy(&lower_ia, ia, sizeof(lower_ia));
		if (ia->ia_valid & ATTR_FILE)
		lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);