fs: rcu-walk aware d_revalidate method

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfs / dir.c

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 37e0a8bb077e7587eefdc7e3cf2ef8cf6afe9cb3..58beace14b1981275d6ac1e0ea8eb1677e2dbcbe 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -938,7 +938,8 @@ static int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
  * component of the path.
  * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT.
  */
-static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask)
+static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd,
+                                               unsigned int mask)
 {
        if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT))
                return 0;
@@ -1018,7 +1019,7 @@ int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry,
  * If the parent directory is seen to have changed, we throw out the
  * cached dentry and do a new lookup.
  */
-static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
+static int nfs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
        struct inode *dir;
        struct inode *inode;
@@ -1027,6 +1028,9 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
        struct nfs_fattr *fattr = NULL;
        int error;
 
+       if (nd->flags & LOOKUP_RCU)
+               return -ECHILD;
+
        parent = dget_parent(dentry);
        dir = parent->d_inode;
        nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);