| commit | 10018f059e19f30513144217f4826b669dab1682 | |
| author | Matthew Dillon <dillon@dragonflybsd.org> | |
| Tue, 21 Aug 2007 17:26:48 +0000 (21 17:26 +0000) | ||
| committer | Matthew Dillon <dillon@dragonflybsd.org> | |
| Tue, 21 Aug 2007 17:26:48 +0000 (21 17:26 +0000) | ||
| tree | 904f16736e86fcec50789cd49eb0fa6ac2b467ef | treesnapshot (tar.gz zip) |
| parent | c4a78ca794fa6d9964f1d3330cd9e1c1dfe2efcf | commitdiff |
getpages/putpages fixup part 1 - Add support for UIO_NOCOPY VOP_WRITEs to
filesystems which use the buffer cache and assert that UIO_NOCOPY is not
being used for filesystems which do not.
For filesystems using the buffer cache all we have to do is force a
read-before-write to fill in any missing pieces of the buffer.
UIO_NOCOPY writes are used for buffer-cache-backed filesystems which do
not implement their own vop_putpages code. At the moment this is only
the msdosfs.
filesystems which use the buffer cache and assert that UIO_NOCOPY is not
being used for filesystems which do not.
For filesystems using the buffer cache all we have to do is force a
read-before-write to fill in any missing pieces of the buffer.
UIO_NOCOPY writes are used for buffer-cache-backed filesystems which do
not implement their own vop_putpages code. At the moment this is only
the msdosfs.