commit 86340e059ccde828c4146f19c52723140ae4aa13 Author: Matthew Dillon <dil...@apollo.backplane.com> Date: Fri Dec 7 14:20:31 2012 -0800
kernel - Fix issues where tmpfs loses file data * For TMPFS, UIO_NOCOPY writes must use bawrite() or bwrite() and must NEVER used buwrite() because these operations are being called via the VM page cleaning code via the pageout daemon or the vnode termination code (when maxvnodes is reached), and the underlying pages are about to be destroyed. * vm_object_terminate() must call vinvalbuf() both before (for normal filesystems) and also after (for tmpfs style filesystems). Otherwise buffers potentially not disposed of during the page cleaning might get left hanging. This is a safety feature. * Remove post-flush test code from vm_object_page_collect_flush() entirely. The IO's are in progress at this point so it makes no sense to set PG_CLEANCHK here. * vm_page_need_commit() must make the object writeable and dirty, I think. * Fix multiple places where m->dirty is tested and PG_NEED_COMMIT is not. Reported-by: vsrinivas, others Summary of changes: sys/vfs/tmpfs/tmpfs_subr.c | 2 +- sys/vfs/tmpfs/tmpfs_vnops.c | 22 +++++++++------- sys/vm/vm_object.c | 57 ++++++++++++++++++------------------------- sys/vm/vm_page.c | 10 ++++--- 4 files changed, 43 insertions(+), 48 deletions(-) http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/86340e059ccde828c4146f19c52723140ae4aa13 -- DragonFly BSD source repository