GFS2: revert "GFS2: d_splice_alias() can't return error"

0d0d110720d7960b77c03c9f2597faaff4b484ae asserts that "d_splice_alias()
can't return error unless it was given an IS_ERR(inode)".

That was true of the implementation of d_splice_alias, but this is
really a problem with d_splice_alias: at a minimum it should be able to
return -ELOOP in the case where inserting the given dentry would cause a
directory loop.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index b8956f24e3d3..890588c7fb33 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -604,6 +604,9 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
         error = PTR_ERR(inode);
         if (!IS_ERR(inode)) {
                 d = d_splice_alias(inode, dentry);
+                error = PTR_ERR(d);
+                if (IS_ERR(d))
+                        goto fail_gunlock;
                 error = 0;
                 if (file) {
                         if (S_ISREG(inode->i_mode)) {
@@ -799,6 +802,11 @@ static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
         }
 
         d = d_splice_alias(inode, dentry);
+        if (IS_ERR(d)) {
+                iput(inode);
+                gfs2_glock_dq_uninit(&gh);
+                return d;
+        }
         if (file && S_ISREG(inode->i_mode))
                 error = finish_open(file, dentry, gfs2_open_common, opened);