git: kernel - Fix pager bug in vm_fault and UFS and have UFS use
commit 1c9602b3f188939350673789fd763f1c4c8251b6
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Mon Jan 18 09:57:51 2010 -0800
kernel - Fix pager bug in vm_fault and UFS and have UFS use vop_stdgetpages
* UFS must call vtruncbuf() before b*write()ing the buffer related to
a shortened file's truncation point. vtruncbuf() can invalidate pages
which are part of the buffer cache buffer. The b*write() revalidates
those pages. If we fail to revalidate the pages we can end up with a
buffer containing invalid pages with B_CACHE set.
* UFS was using its own getpages code in certain cases. Adjust it to
use vop_stdgetpages() in all cases by default.
vop_stdgetpages() uses UIO_NOCOPY VOP_READ()s to fill in missing data
and to perform read-ahead operations. It should properly deal with
partially valid and partially dirty pages as well as deal with file
holes.
* vm_fault can pass a valid page to the readrest: code if PG_RAM is set.
We cannot free this page if the underlying vnode contains a hole at
that location. Call vm_pager_get_page() unconditionally.
This fixes fsx failures for both NFS and UFS (when UFS is using
vop_stdgetpages()).
Summary of changes:
sys/vfs/hammer/hammer_vnops.c | 11 +++++++++++
sys/vfs/ufs/ffs_alloc.c | 1 +
sys/vfs/ufs/ffs_balloc.c | 16 ++++++++++++----
sys/vfs/ufs/ffs_inode.c | 20 +++++++++++++++-----
sys/vfs/ufs/ffs_subr.c | 3 ++-
sys/vfs/ufs/ufs_readwrite.c | 34 ++++++++++++++++++++++++----------
sys/vm/vm_fault.c | 21 ++++++++++++---------
sys/vm/vm_object.c | 5 +++++
8 files changed, 82 insertions(+), 29 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/1c9602b3f188939350673789fd763f1c4c8251b6
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