47cbff34fa
When an NFS mount is hung against an unresponsive NFS server, the "umount -f" option can be used to dismount the mount. Unfortunately, "umount -f" gets hung as well if a "umount" without "-f" has already been done. Usually, this is because of a vnode lock being held by the "umount" for the mounted-on vnode. This patch adds kernel code so that a new "-N" option can be added to "umount", allowing it to avoid getting hung for this case. It adds two flags. One indicates that a forced dismount is about to happen and the other is used, along with setting mnt_data == NULL, to handshake with the nfs_unmount() VFS call. It includes a slight change to the interface used between the client and common NFS modules, so I bumped __FreeBSD_version to ensure both modules are rebuilt. Tested by: pho Reviewed by: kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D11735 |
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| .. | ||
| nfs_clbio.c | ||
| nfs_clcomsubs.c | ||
| nfs_clkdtrace.c | ||
| nfs_clkrpc.c | ||
| nfs_clnfsiod.c | ||
| nfs_clnode.c | ||
| nfs_clport.c | ||
| nfs_clrpcops.c | ||
| nfs_clstate.c | ||
| nfs_clsubs.c | ||
| nfs_clvfsops.c | ||
| nfs_clvnops.c | ||
| nfs_kdtrace.h | ||
| nfs.h | ||
| nfsmount.h | ||
| nfsnode.h | ||
| nlminfo.h | ||