Add an option that triggers the clearing of the file access cache as soon as the cache timestamp becomes older than the user's login time. Signed-off-by: Chengen Du <chengen.du@xxxxxxxxxxxxx> --- utils/mount/nfs.man | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/utils/mount/nfs.man b/utils/mount/nfs.man index 7a410422..68514fbd 100644 --- a/utils/mount/nfs.man +++ b/utils/mount/nfs.man @@ -574,6 +574,7 @@ The .B sloppy option is an alternative to specifying .BR mount.nfs " -s " option. + .TP 1.5i .BI xprtsec= policy Specifies the use of transport layer security to protect NFS network @@ -607,6 +608,19 @@ option is not specified, the default behavior depends on the kernel, but is usually equivalent to .BR "xprtsec=none" . +.TP 1.5i +.B fasc +Triggers the clearing of the file access cache as soon as the cache +timestamp becomes older than the user's login time. It is supported +in kernels 6.4 and later. +.IP +NFS servers often refresh their users' group membership at their +own cadence, which means the NFS client's file access cache can +become stale if the user's group membership changes on the server +after they've logged in on the client. To align with the principles +of the POSIX design, which only refreshes the user's supplementary +group information upon login, the mechanism uses the user's login +time to determine whether the file access cache needs to be refreshed. .SS "Options for NFS versions 2 and 3 only" Use these options, along with the options in the above subsection, for NFS versions 2 and 3 only. -- 2.39.2
