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kernfs: dont call d_splice_alias() under kernfs node lock 

The call to d_splice_alias() in kernfs_iop_lookup() doesn't depend on
any kernfs node so there's no reason to hold the kernfs node lock when
calling it.

Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Link: https://lore.kernel.org/r/162642772000.63632.10672683419693513226.stgit@web.messagingengine.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Kent 2021-07-16 17:28:40 +08:00 committed by Greg Kroah-Hartman
parent 47b5c64d0a
commit df6192f47d
1 changed files with 2 additions and 4 deletions
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6
fs/kernfs/dir.c
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@ -1100,7 +1100,6 @@ static struct dentry *kernfs_iop_lookup(struct inode *dir,
struct dentry *dentry,
unsigned int flags)
{
struct dentry *ret;
struct kernfs_node *parent = dir->i_private;
struct kernfs_node *kn;
struct inode *inode = NULL;
@ -1120,11 +1119,10 @@ static struct dentry *kernfs_iop_lookup(struct inode *dir,
/* Needed only for negative dentry validation */
if (!inode)
kernfs_set_rev(parent, dentry);
/* instantiate and hash (possibly negative) dentry */
ret = d_splice_alias(inode, dentry);
up_read(&kernfs_rwsem);
return ret;
/* instantiate and hash (possibly negative) dentry */
return d_splice_alias(inode, dentry);
}
static int kernfs_iop_mkdir(struct user_namespace *mnt_userns,