git: DragonFly_RELEASE_3_0 VFS accounting: check if nullfs mp* really exist
ftigeot at crater.dragonflybsd.org
Sat Feb 18 01:12:26 PST 2012
Author: Francois Tigeot <ftigeot at wolfpond.org>
Date: Fri Feb 17 23:58:58 2012 +0100
VFS accounting: check if nullfs mp* really exist
* Nullfs are a clever hack, they forget their mp after mount and let the
non-nullfs underlying mount point do all the work
* Nevertheless, we need to get the real struct mount associated to a mount
point to count the space used by PFSes. We cache it in the vnode.
* But since the vnode we use really belongs to the lowest underlying
mount point, the upper-level mp may already have been freed.
* We need to first check if it still valid; a new function,
mountlist_exists() now exists for that purpose.
* Should fix issue #2266
Summary of changes:
sys/kern/vfs_mount.c | 23 +++++++++++++++++++++++
sys/kern/vfs_vopops.c | 5 ++++-
sys/sys/mount.h | 1 +
3 files changed, 28 insertions(+), 1 deletions(-)
DragonFly BSD source repository
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