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-rw-r--r--fs/kernfs/inode.c18
-rw-r--r--fs/kernfs/mount.c4
2 files changed, 14 insertions, 8 deletions
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
index dad749f39518..c0eae1725435 100644
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -185,11 +185,13 @@ int kernfs_iop_getattr(struct user_namespace *mnt_userns,
struct inode *inode = d_inode(path->dentry);
struct kernfs_node *kn = inode->i_private;
- down_write(&kernfs_rwsem);
+ down_read(&kernfs_rwsem);
+ spin_lock(&inode->i_lock);
kernfs_refresh_inode(kn, inode);
- up_write(&kernfs_rwsem);
-
generic_fillattr(&init_user_ns, inode, stat);
+ spin_unlock(&inode->i_lock);
+ up_read(&kernfs_rwsem);
+
return 0;
}
@@ -272,17 +274,21 @@ int kernfs_iop_permission(struct user_namespace *mnt_userns,
struct inode *inode, int mask)
{
struct kernfs_node *kn;
+ int ret;
if (mask & MAY_NOT_BLOCK)
return -ECHILD;
kn = inode->i_private;
- down_write(&kernfs_rwsem);
+ down_read(&kernfs_rwsem);
+ spin_lock(&inode->i_lock);
kernfs_refresh_inode(kn, inode);
- up_write(&kernfs_rwsem);
+ ret = generic_permission(&init_user_ns, inode, mask);
+ spin_unlock(&inode->i_lock);
+ up_read(&kernfs_rwsem);
- return generic_permission(&init_user_ns, inode, mask);
+ return ret;
}
int kernfs_xattr_get(struct kernfs_node *kn, const char *name,
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index baa4155ba2ed..f2f909d09f52 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -255,9 +255,9 @@ static int kernfs_fill_super(struct super_block *sb, struct kernfs_fs_context *k
sb->s_shrink.seeks = 0;
/* get root inode, initialize and unlock it */
- down_write(&kernfs_rwsem);
+ down_read(&kernfs_rwsem);
inode = kernfs_get_inode(sb, info->root->kn);
- up_write(&kernfs_rwsem);
+ up_read(&kernfs_rwsem);
if (!inode) {
pr_debug("kernfs: could not get root inode\n");
return -ENOMEM;