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Commit ed4433d7 authored by Fabian Frederick's avatar Fabian Frederick Committed by Linus Torvalds
Browse files

fs/affs: make affs exportable 

Add standard functions making AFFS work with NFS.

Functions based on ext4 implementation.  Tested on loop device.

Link: http://lkml.kernel.org/r/20170109191208.6085-4-fabf@skynet.be


Signed-off-by: default avatarFabian Frederick <fabf@skynet.be>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d5de9fd5

fs/affs/affs.h

+1 −0
Original line number Diff line number Diff line
@@ -162,6 +162,7 @@ extern void affs_free_bitmap(struct super_block *sb); 


/* namei.c */



extern const struct export_operations affs_export_ops;

extern int	affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);

extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);

extern int	affs_unlink(struct inode *dir, struct dentry *dentry);

fs/affs/namei.c

+40 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
 */



#include "affs.h"

#include <linux/exportfs.h>



typedef int (*toupper_t)(int);
@@ -465,3 +466,42 @@ affs_rename(struct inode *old_dir, struct dentry *old_dentry, 
	affs_brelse(bh);

	return retval;

}



static struct inode *affs_nfs_get_inode(struct super_block *sb, u64 ino,

					u32 generation)

{

	struct inode *inode;



	if (!affs_validblock(sb, ino))

		return ERR_PTR(-ESTALE);



	inode = affs_iget(sb, ino);

	if (IS_ERR(inode))

		return ERR_CAST(inode);



	if (generation && inode->i_generation != generation) {

		iput(inode);

		return ERR_PTR(-ESTALE);

	}



	return inode;

}



static struct dentry *affs_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,

				    affs_nfs_get_inode);

}



static struct dentry *affs_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,

				    affs_nfs_get_inode);

}



const struct export_operations affs_export_ops = {

	.fh_to_dentry = affs_fh_to_dentry,

	.fh_to_parent = affs_fh_to_parent,

};

fs/affs/super.c

+1 −0
Original line number Diff line number Diff line
@@ -507,6 +507,7 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent) 
		return -ENOMEM;

	}



	sb->s_export_op = &affs_export_ops;

	pr_debug("s_flags=%lX\n", sb->s_flags);

	return 0;

}