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authorNeil Brown <neilb@suse.de>2010-08-10 10:20:05 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-08-10 10:20:05 -0400
commitf5a73672d1811f2fb1dcb62ca90ceb12b2050ae7 (patch)
treef9d8798abbcbb6df399dea3d718ded7b2b2b5270 /fs/nfs/nfs4proc.c
parent669502ff31d7dba1849aec7ee2450a3c61f57d39 (diff)
NFS: allow close-to-open cache semantics to apply to root of NFS filesystem
To obey NFS cache semantics, the client must verify the cached attributes when a file is opened. In most cases this is done by a call to d_validate as one of the last steps in path_walk. However for the root of a filesystem, d_validate is only ever called on the mounted-on filesystem (except when the path ends '.' or '..'). So NFS has no chance to validate the attributes. So, in nfs_opendir, we revalidate the attributes if the opened directory is the mountpoint. This may cause double-validation for "." and ".." lookups, but that is better than missing regular /path/name lookups completely. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4proc.c')
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