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mount options: fix hostfs

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Add the "host path" option to /proc/mounts for UML hostfs filesystems.

The mount source (mnt_devname) should really be used for this, but not
easy to change now in a backward compatible way.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi 2008-02-08 04:21:43 -08:00 committed by Linus Torvalds
parent d1875dbaa5
commit dd2cc4dff3
1 changed files with 14 additions and 0 deletions
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14
fs/hostfs/hostfs_kern.c
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@ -11,6 +11,7 @@
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/pagemap.h> #include <linux/pagemap.h>
#include <linux/statfs.h> #include <linux/statfs.h>
#include <linux/seq_file.h>
#include "hostfs.h" #include "hostfs.h"
#include "init.h" #include "init.h"
#include "kern.h" #include "kern.h"
@ -322,12 +323,25 @@ static void hostfs_destroy_inode(struct inode *inode)
kfree(HOSTFS_I(inode)); kfree(HOSTFS_I(inode));
} }
static int hostfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
struct inode *root = vfs->mnt_sb->s_root->d_inode;
const char *root_path = HOSTFS_I(root)->host_filename;
size_t offset = strlen(root_ino) + 1;
if (strlen(root_path) > offset)
seq_printf(seq, ",%s", root_path + offset);
return 0;
}
static const struct super_operations hostfs_sbops = { static const struct super_operations hostfs_sbops = {
.alloc_inode = hostfs_alloc_inode, .alloc_inode = hostfs_alloc_inode,
.drop_inode = generic_delete_inode, .drop_inode = generic_delete_inode,
.delete_inode = hostfs_delete_inode, .delete_inode = hostfs_delete_inode,
.destroy_inode = hostfs_destroy_inode, .destroy_inode = hostfs_destroy_inode,
.statfs = hostfs_statfs, .statfs = hostfs_statfs,
.show_options = hostfs_show_options,
}; };
int hostfs_readdir(struct file *file, void *ent, filldir_t filldir) int hostfs_readdir(struct file *file, void *ent, filldir_t filldir)