Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / fs / overlayfs / super.c

diff --git a/kernel/fs/overlayfs/super.c b/kernel/fs/overlayfs/super.c
index 000b2ed..d70208c 100644 (file)
--- a/kernel/fs/overlayfs/super.c
+++ b/kernel/fs/overlayfs/super.c
@@ -276,6 +276,37 @@ static void ovl_dentry_release(struct dentry *dentry)
        }
 }
 
+static struct dentry *ovl_d_real(struct dentry *dentry, struct inode *inode)
+{
+       struct dentry *real;
+
+       if (d_is_dir(dentry)) {
+               if (!inode || inode == d_inode(dentry))
+                       return dentry;
+               goto bug;
+       }
+
+       real = ovl_dentry_upper(dentry);
+       if (real && (!inode || inode == d_inode(real)))
+               return real;
+
+       real = ovl_dentry_lower(dentry);
+       if (!real)
+               goto bug;
+
+       if (!inode || inode == d_inode(real))
+               return real;
+
+       /* Handle recursion */
+       if (real->d_flags & DCACHE_OP_REAL)
+               return real->d_op->d_real(real, inode);
+
+bug:
+       WARN(1, "ovl_d_real(%pd4, %s:%lu\n): real dentry not found\n", dentry,
+            inode ? inode->i_sb->s_id : "NULL", inode ? inode->i_ino : 0);
+       return dentry;
+}
+
 static int ovl_dentry_revalidate(struct dentry *dentry, unsigned int flags)
 {
        struct ovl_entry *oe = dentry->d_fsdata;
@@ -320,11 +351,13 @@ static int ovl_dentry_weak_revalidate(struct dentry *dentry, unsigned int flags)
 static const struct dentry_operations ovl_dentry_operations = {
        .d_release = ovl_dentry_release,
        .d_select_inode = ovl_d_select_inode,
+       .d_real = ovl_d_real,
 };
 
 static const struct dentry_operations ovl_reval_dentry_operations = {
        .d_release = ovl_dentry_release,
        .d_select_inode = ovl_d_select_inode,
+       .d_real = ovl_d_real,
        .d_revalidate = ovl_dentry_revalidate,
        .d_weak_revalidate = ovl_dentry_weak_revalidate,
 };
@@ -343,7 +376,8 @@ static struct ovl_entry *ovl_alloc_entry(unsigned int numlower)
 static bool ovl_dentry_remote(struct dentry *dentry)
 {
        return dentry->d_flags &
-               (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
+               (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE |
+                DCACHE_OP_REAL);
 }
 
 static bool ovl_dentry_weird(struct dentry *dentry)
@@ -729,6 +763,10 @@ retry:
                struct kstat stat = {
                        .mode = S_IFDIR | 0,
                };
+               struct iattr attr = {
+                       .ia_valid = ATTR_MODE,
+                       .ia_mode = stat.mode,
+               };
 
                if (work->d_inode) {
                        err = -EEXIST;
@@ -744,6 +782,21 @@ retry:
                err = ovl_create_real(dir, work, &stat, NULL, NULL, true);
                if (err)
                        goto out_dput;
+
+               err = vfs_removexattr(work, XATTR_NAME_POSIX_ACL_DEFAULT);
+               if (err && err != -ENODATA && err != -EOPNOTSUPP)
+                       goto out_dput;
+
+               err = vfs_removexattr(work, XATTR_NAME_POSIX_ACL_ACCESS);
+               if (err && err != -ENODATA && err != -EOPNOTSUPP)
+                       goto out_dput;
+
+               /* Clear any inherited mode bits */
+               inode_lock(work->d_inode);
+               err = notify_change(work, &attr, NULL);
+               inode_unlock(work->d_inode);
+               if (err)
+                       goto out_dput;
        }
 out_unlock:
        mutex_unlock(&dir->i_mutex);