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Commit 6a7fed4e authored by Tejun Heo's avatar Tejun Heo Committed by Greg Kroah-Hartman
Browse files

kernfs: implement kernfs_syscall_ops->remount_fs() and ->show_options() 



Add two super_block related syscall callbacks ->remount_fs() and
->show_options() to kernfs_syscall_ops.  These simply forward the
matching super_operations.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 90c07c89

fs/kernfs/mount.c

+23 −0
Original line number Diff line number Diff line
@@ -19,10 +19,33 @@ 


struct kmem_cache *kernfs_node_cache;



static int kernfs_sop_remount_fs(struct super_block *sb, int *flags, char *data)

{

	struct kernfs_root *root = kernfs_info(sb)->root;

	struct kernfs_syscall_ops *scops = root->syscall_ops;



	if (scops && scops->remount_fs)

		return scops->remount_fs(root, flags, data);

	return 0;

}



static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)

{

	struct kernfs_root *root = kernfs_root(dentry->d_fsdata);

	struct kernfs_syscall_ops *scops = root->syscall_ops;



	if (scops && scops->show_options)

		return scops->show_options(sf, root);

	return 0;

}



static const struct super_operations kernfs_sops = {

	.statfs		= simple_statfs,

	.drop_inode	= generic_delete_inode,

	.evict_inode	= kernfs_evict_inode,



	.remount_fs	= kernfs_sop_remount_fs,

	.show_options	= kernfs_sop_show_options,

};



static int kernfs_fill_super(struct super_block *sb)

include/linux/kernfs.h

+3 −0
Original line number Diff line number Diff line
@@ -115,6 +115,9 @@ struct kernfs_node { 
 * kernfs_node parameter.

 */

struct kernfs_syscall_ops {

	int (*remount_fs)(struct kernfs_root *root, int *flags, char *data);

	int (*show_options)(struct seq_file *sf, struct kernfs_root *root);



	int (*mkdir)(struct kernfs_node *parent, const char *name,

		     umode_t mode);

	int (*rmdir)(struct kernfs_node *kn);