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Call remap_verify_area() on the source file as well as the destination.
When called from vfs_dedupe_file_range() the check as already been
performed, but not so if called from layered fs (overlayfs, etc...)
Could ommit the redundant check in vfs_dedupe_file_range(), but leave for
now to get error early (for fear of breaking backward compatibility).
This call shouldn't be performance sensitive.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Complete the migration by moving the file remapping helper functions out
of read_write.c and into remap_range.c. This reduces the clutter in the
first file and (eventually) will make it so that we can compile out the
second file if it isn't needed.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
I would like to move all the generic helpers for the vfs remap range
functionality (aka clonerange and dedupe) into a separate file so that
they won't be scattered across the vfs and the mm subsystems. The
eventual goal is to be able to deselect remap_range.c if none of the
filesystems need that code, but the tricky part here is picking a
stable(ish) part of the merge window to rearrange code.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
