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

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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: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2014-02-03 14:09:10 -05:00 committed by Greg Kroah-Hartman
parent 90c07c895c
commit 6a7fed4eef
2 changed files with 26 additions and 0 deletions
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23
fs/kernfs/mount.c
View file

@ -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)

3
include/linux/kernfs.h
View file

@ -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);