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Commit 905251a0 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Linus Torvalds
Browse files

isofs: new export ops



Nice little cleanup by consolidating things a little and using a structure for
the special file handle format.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Cc: Neil Brown <neilb@suse.de>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1305edad
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+29 −38
Original line number Diff line number Diff line
@@ -42,16 +42,6 @@ isofs_export_iget(struct super_block *sb,
	return result;
}

static struct dentry *
isofs_export_get_dentry(struct super_block *sb, void *vobjp)
{
	__u32 *objp = vobjp;
	unsigned long block = objp[0];
	unsigned long offset = objp[1];
	__u32 generation = objp[2];
	return isofs_export_iget(sb, block, offset, generation);
}

/* This function is surprisingly simple.  The trick is understanding
 * that "child" is always a directory. So, to find its parent, you
 * simply need to find its ".." entry, normalize its block and offset,
@@ -182,43 +172,44 @@ isofs_export_encode_fh(struct dentry *dentry,
	return type;
}

struct isofs_fid {
	u32 block;
	u16 offset;
	u16 parent_offset;
	u32 generation;
	u32 parent_block;
	u32 parent_generation;
};

static struct dentry *
isofs_export_decode_fh(struct super_block *sb,
		       __u32 *fh32,
		       int fh_len,
		       int fileid_type,
		       int (*acceptable)(void *context, struct dentry *de),
		       void *context)
static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
	struct fid *fid, int fh_len, int fh_type)
{
	__u16 *fh16 = (__u16*)fh32;
	__u32 child[3];   /* The child is what triggered all this. */
	__u32 parent[3];  /* The parent is just along for the ride. */
	struct isofs_fid *ifid = (struct isofs_fid *)fid;

	if (fh_len < 3 || fileid_type > 2)
	if (fh_len < 3 || fh_type > 2)
		return NULL;

	child[0] = fh32[0];
	child[1] = fh16[2];  /* fh16 [sic] */
	child[2] = fh32[2];

	parent[0] = 0;
	parent[1] = 0;
	parent[2] = 0;
	if (fileid_type == 2) {
		if (fh_len > 2) parent[0] = fh32[3];
		parent[1] = fh16[3];  /* fh16 [sic] */
		if (fh_len > 4) parent[2] = fh32[4];
	return isofs_export_iget(sb, ifid->block, ifid->offset,
			ifid->generation);
}

	return sb->s_export_op->find_exported_dentry(sb, child, parent,
						     acceptable, context);
}
static struct dentry *isofs_fh_to_parent(struct super_block *sb,
		struct fid *fid, int fh_len, int fh_type)
{
	struct isofs_fid *ifid = (struct isofs_fid *)fid;

	if (fh_type != 2)
		return NULL;

	return isofs_export_iget(sb,
			fh_len > 2 ? ifid->parent_block : 0,
			ifid->parent_offset,
			fh_len > 4 ? ifid->parent_generation : 0);
}

struct export_operations isofs_export_ops = {
	.decode_fh	= isofs_export_decode_fh,
	.encode_fh	= isofs_export_encode_fh,
	.get_dentry	= isofs_export_get_dentry,
	.fh_to_dentry	= isofs_fh_to_dentry,
	.fh_to_parent	= isofs_fh_to_parent,
	.get_parent     = isofs_export_get_parent,
};