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Add a check for MNTK_UNMOUNTF at the beginning of nfs_sync()

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in the old NFS client so that a forced dismount doesn't
get stuck in the VFS_SYNC() call that happens before
VFS_UNMOUNT() in dounmount(). Analagous to r222329 for the new NFS client.
An additional change is needed before forced dismounts will work.

PR:		kern/157365
MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2011-05-29 20:55:23 +00:00
parent d015abb774
commit a8842a96db
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=222464
1 changed files with 11 additions and 1 deletions
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12
sys/nfsclient/nfs_vfsops.c
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@ -1408,10 +1408,20 @@ nfs_sync(struct mount *mp, int waitfor)
td = curthread;
MNT_ILOCK(mp);
/*
* If a forced dismount is in progress, return from here so that
* the umount(2) syscall doesn't get stuck in VFS_SYNC() before
* calling VFS_UNMOUNT().
*/
if ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
MNT_IUNLOCK(mp);
return (EBADF);
}
/*
* Force stale buffer cache information to be flushed.
*/
MNT_ILOCK(mp);
loop:
MNT_VNODE_FOREACH(vp, mp, mvp) {
VI_LOCK(vp);