linux-kernel - [PATCH 5/20] fs/efs: return f

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Date:	Tue, 20 Jan 2009 01:32:29 +0800
From:	Coly Li <coly.li@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 5/20] fs/efs: return f_fsid for statfs(2)

This patch makes efs return f_fsid info for statfs(2), and does a little variable renaming in
efs_statfs().

Signed-off-by: Coly Li <coly.li@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 fs/efs/super.c |   20 ++++++++++++--------
 1 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/fs/efs/super.c b/fs/efs/super.c
index 73b19cf..f049428 100644
--- a/fs/efs/super.c
+++ b/fs/efs/super.c
@@ -329,18 +329,22 @@ out_no_fs:
 }

 static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
-	struct efs_sb_info *sb = SUPER_INFO(dentry->d_sb);
+	struct super_block *sb = dentry->d_sb;
+	struct efs_sb_info *sbi = SUPER_INFO(sb);
+	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);

 	buf->f_type    = EFS_SUPER_MAGIC;	/* efs magic number */
 	buf->f_bsize   = EFS_BLOCKSIZE;		/* blocksize */
-	buf->f_blocks  = sb->total_groups *	/* total data blocks */
-			(sb->group_size - sb->inode_blocks);
-	buf->f_bfree   = sb->data_free;		/* free data blocks */
-	buf->f_bavail  = sb->data_free;		/* free blocks for non-root */
-	buf->f_files   = sb->total_groups *	/* total inodes */
-			sb->inode_blocks *
+	buf->f_blocks  = sbi->total_groups *	/* total data blocks */
+			(sbi->group_size - sbi->inode_blocks);
+	buf->f_bfree   = sbi->data_free;	/* free data blocks */
+	buf->f_bavail  = sbi->data_free;	/* free blocks for non-root */
+	buf->f_files   = sbi->total_groups *	/* total inodes */
+			sbi->inode_blocks *
 			(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
-	buf->f_ffree   = sb->inode_free;	/* free inodes */
+	buf->f_ffree   = sbi->inode_free;	/* free inodes */
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
 	buf->f_namelen = EFS_MAXNAMELEN;	/* max filename length */

 	return 0;

-- 
Coly Li
SuSE Labs



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