[PATCH v3] nfs(5): adding new mount option 'fasc'

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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 | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/utils/mount/nfs.man b/utils/mount/nfs.man
index 9b4bc9c9..2ac7b4ad 100644
--- a/utils/mount/nfs.man
+++ b/utils/mount/nfs.man
@@ -608,6 +608,19 @@ option is not specified,
 the default behavior depends on the kernel version,
 but is usually equivalent to
 .BR "xprtsec=none" .
+.TP 1.5i
+.BI 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




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