tree e860a33119edf36e367ad354428dfc0d6201273c
parent 93e3270c87549dc531a0b0e5d06362d998d810cb
author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> 1215818851 -0400
committer Theodore Ts'o <tytso@mit.edu> 1215818851 -0400

ext4: Use page_mkwrite vma_operations to get mmap write notification.

We would like to get notified when we are doing a write on mmap section.
This is needed with respect to preallocated area. We split the preallocated
area into initialzed extent and uninitialzed extent in the call back. This
let us handle ENOSPC better. Otherwise we get ENOSPC in the writepage and
that would result in data loss. The changes are also needed to handle ENOSPC
when writing to an mmap section of files with holes.

Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>