Commit 5f556aab authored by David Woodhouse's avatar David Woodhouse Committed by Al Viro
Browse files

[JFFS2] Reinstate NFS exportability 



Now that the readdir/lookup deadlock issues have been dealt with, we can
export JFFS2 file systems again.

(For now, you have to specify fsid manually; we should add a method to
the export_ops to handle that too.)

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent d88f1833

fs/jffs2/super.c

+48 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/mtd/super.h>

#include <linux/ctype.h>

#include <linux/namei.h>

#include <linux/exportfs.h>

#include "compr.h"

#include "nodelist.h"
@@ -62,6 +63,52 @@ static int jffs2_sync_fs(struct super_block *sb, int wait) 
	return 0;

}



static struct inode *jffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,

					 uint32_t generation)

{

	/* We don't care about i_generation. We'll destroy the flash

	   before we start re-using inode numbers anyway. And even

	   if that wasn't true, we'd have other problems...*/

	return jffs2_iget(sb, ino);

}



static struct dentry *jffs2_fh_to_dentry(struct super_block *sb, struct fid *fid,

					 int fh_len, int fh_type)

{

        return generic_fh_to_dentry(sb, fid, fh_len, fh_type,

                                    jffs2_nfs_get_inode);

}



static struct dentry *jffs2_fh_to_parent(struct super_block *sb, struct fid *fid,

					 int fh_len, int fh_type)

{

        return generic_fh_to_parent(sb, fid, fh_len, fh_type,

                                    jffs2_nfs_get_inode);

}



static struct dentry *jffs2_get_parent(struct dentry *child)

{

	struct jffs2_inode_info *f;

	uint32_t pino;



	BUG_ON(!S_ISDIR(child->d_inode->i_mode));



	f = JFFS2_INODE_INFO(child->d_inode);



	pino = f->inocache->pino_nlink;



	JFFS2_DEBUG("Parent of directory ino #%u is #%u\n",

		    f->inocache->ino, pino);



	return d_obtain_alias(jffs2_iget(child->d_inode->i_sb, pino));

}



static struct export_operations jffs2_export_ops = {

	.get_parent = jffs2_get_parent,

	.fh_to_dentry = jffs2_fh_to_dentry,

	.fh_to_parent = jffs2_fh_to_parent,

};



static const struct super_operations jffs2_super_operations =

{

	.alloc_inode =	jffs2_alloc_inode,
@@ -104,6 +151,7 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent) 
	spin_lock_init(&c->inocache_lock);



	sb->s_op = &jffs2_super_operations;

	sb->s_export_op = &jffs2_export_ops;

	sb->s_flags = sb->s_flags | MS_NOATIME;

	sb->s_xattr = jffs2_xattr_handlers;

#ifdef CONFIG_JFFS2_FS_POSIX_ACL

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