From 75180df2ed467866ada839fe73cf7cc7d75c0a22 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 16 May 2007 16:53:28 -0400 Subject: NFS: Add the mount option "nosharecache" Prior to David Howell's mount changes in 2.6.18, users who mounted different directories which happened to be from the same filesystem on the server would get different super blocks, and hence could choose different mount options. As long as there were no hard linked files that crossed from one subtree to another, this was quite safe. Post the changes, if the two directories are on the same filesystem (have the same 'fsid'), they will share the same super block, and hence the same mount options. Add a flag to allow users to elect not to share the NFS super block with another mount point, even if the fsids are the same. This will allow users to set different mount options for the two different super blocks, as was previously possible. It is still up to the user to ensure that there are no cache coherency issues when doing this, however the default behaviour will be to share super blocks whenever two paths result in the same fsid. Signed-off-by: Trond Myklebust --- include/linux/nfs_mount.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/nfs_mount.h') diff --git a/include/linux/nfs_mount.h b/include/linux/nfs_mount.h index 0b82a17c705b..a3ade89a64d2 100644 --- a/include/linux/nfs_mount.h +++ b/include/linux/nfs_mount.h @@ -62,6 +62,7 @@ struct nfs_mount_data { #define NFS_MOUNT_STRICTLOCK 0x1000 /* reserved for NFSv4 */ #define NFS_MOUNT_SECFLAVOUR 0x2000 /* 5 */ #define NFS_MOUNT_NORDIRPLUS 0x4000 /* 5 */ +#define NFS_MOUNT_UNSHARED 0x8000 /* 5 */ #define NFS_MOUNT_FLAGMASK 0xFFFF #endif -- cgit v1.2.3