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authorTrond Myklebust <Trond.Myklebust@netapp.com>2007-10-02 19:13:04 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-10-09 17:20:16 -0400
commita12802cab8520f86c9a80bbf87d10ee6171687d1 (patch)
tree95e65c0541f0488b9fa6d31441cd584b2fbaf480 /fs/nfs
parentb050aa791fad6b060d6ff59305f01289e18b058c (diff)
NFS: Be strict about dentry revalidation when doing exclusive create
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/dir.c29
1 files changed, 14 insertions, 15 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 393c4813691..c2207e3f263 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -669,6 +669,19 @@ static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigne
}
/*
+ * Use intent information to check whether or not we're going to do
+ * an O_EXCL create using this path component.
+ */
+static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd)
+{
+ if (NFS_PROTO(dir)->version == 2)
+ return 0;
+ if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0)
+ return 0;
+ return (nd->intent.open.flags & O_EXCL) != 0;
+}
+
+/*
* Inode and filehandle revalidation for lookups.
*
* We force revalidation in the cases where the VFS sets LOOKUP_REVAL,
@@ -754,7 +767,7 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
}
/* Force a full look up iff the parent directory has changed */
- if (nfs_check_verifier(dir, dentry)) {
+ if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) {
if (nfs_lookup_verify_inode(inode, nd))
goto out_zap_parent;
goto out_valid;
@@ -848,20 +861,6 @@ struct dentry_operations nfs_dentry_operations = {
.d_iput = nfs_dentry_iput,
};
-/*
- * Use intent information to check whether or not we're going to do
- * an O_EXCL create using this path component.
- */
-static inline
-int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd)
-{
- if (NFS_PROTO(dir)->version == 2)
- return 0;
- if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0)
- return 0;
- return (nd->intent.open.flags & O_EXCL) != 0;
-}
-
static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
{
struct dentry *res;