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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-07-15 17:58:13 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-10-07 17:22:20 -0400
commit4eec952e42314b53e48fef1f54dd89cbf9789734 (patch)
tree6c0e407472224954987021a815036fe561f88c5a
parent1daef0a868370c5a96d031b9202e3354bea060e6 (diff)
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NFS: Add options for finer control of the lookup cache
Add the flag NFS_MOUNT_LOOKUP_CACHE_NONEG to turn off the caching of negative dentries. In reality what we do is to force nfs_lookup_revalidate() to always discard negative dentries. Add the flag NFS_MOUNT_LOOKUP_CACHE_NONE for enforcing stricter revalidation of dentries. It forces the revalidate code to always do a lookup instead of just checking the cached mtime of the parent directory. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/dir.c4
-rw-r--r--include/linux/nfs_mount.h4
2 files changed, 8 insertions, 0 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 74f92b7..49d5654 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -667,6 +667,8 @@ static int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
{
if (IS_ROOT(dentry))
return 1;
+ if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
+ return 0;
if (!nfs_verify_change_attribute(dir, dentry->d_time))
return 0;
/* Revalidate nfsi->cache_change_attribute before we declare a match */
@@ -750,6 +752,8 @@ int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry,
/* Don't revalidate a negative dentry if we're creating a new file */
if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0)
return 0;
+ if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG)
+ return 1;
return !nfs_check_verifier(dir, dentry);
}
diff --git a/include/linux/nfs_mount.h b/include/linux/nfs_mount.h
index df7c6b7..6549a06 100644
--- a/include/linux/nfs_mount.h
+++ b/include/linux/nfs_mount.h
@@ -65,4 +65,8 @@ struct nfs_mount_data {
#define NFS_MOUNT_UNSHARED 0x8000 /* 5 */
#define NFS_MOUNT_FLAGMASK 0xFFFF
+/* The following are for internal use only */
+#define NFS_MOUNT_LOOKUP_CACHE_NONEG 0x10000
+#define NFS_MOUNT_LOOKUP_CACHE_NONE 0x20000
+
#endif