linux-kernel - [PATCH 3/6 linux-next] fs/affs: make affs exportable

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Date:   Tue,  3 Jan 2017 22:30:39 +0100
From:   Fabian Frederick <fabf@...net.be>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, fabf@...net.be
Subject: [PATCH 3/6 linux-next] fs/affs: make affs exportable

Add standard functions making AFFS work with NFS.

Functions based on ext4 implementation.
Tested on loop device.

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/affs/affs.h  |  1 +
 fs/affs/namei.c | 40 ++++++++++++++++++++++++++++++++++++++++
 fs/affs/super.c |  1 +
 3 files changed, 42 insertions(+)

diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index efe6839..1b55428 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -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);
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 29186d2..04c3156f 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -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,
+};
diff --git a/fs/affs/super.c b/fs/affs/super.c
index d638486..98bd952 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -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;
 }
-- 
2.7.4