path: root/fs/nfs/super.c
diff options
authorTrond Myklebust <trondmy@gmail.com>2020-01-06 15:39:37 -0500
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2020-01-15 10:54:33 -0500
commitc74dfe97c104bda5144bfa8193d8e5ea67d5da7f (patch)
tree50a1d7f2e8791c3af949391359fb1279b1073244 /fs/nfs/super.c
parentNFS: Trust cached access if we've already revalidated the inode once (diff)
NFS: Add mount option 'softreval'
Add a mount option 'softreval' that allows attribute revalidation 'getattr' calls to time out, and causes them to fall back to using the cached attributes. The use case for this option is for ensuring that we can still (slowly) traverse paths and use cached information even when the server is down. Once the server comes back up again, the getattr calls start succeeding, and the caches will revalidate as usual. The 'softreval' mount option is automatically enabled if you have specified 'softerr'. It can be turned off using the options 'nosoftreval', or 'hard'. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/super.c')
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 76e0198adcfa..dada09b391c6 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -375,6 +375,7 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
} nfs_info[] = {
{ NFS_MOUNT_SOFT, ",soft", "" },
{ NFS_MOUNT_SOFTERR, ",softerr", "" },
+ { NFS_MOUNT_SOFTREVAL, ",softreval", "" },
{ NFS_MOUNT_POSIX, ",posix", "" },
{ NFS_MOUNT_NOCTO, ",nocto", "" },
{ NFS_MOUNT_NOAC, ",noac", "" },