linux-kernel - [PATCH 4/4] XFS: Set NOSEC flag early when inode has no xattrs.

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Message-Id: <1306536845-24162-4-git-send-email-andi@firstfloor.org>
Date:	Fri, 27 May 2011 15:54:05 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	Andi Kleen <ak@...ux.intel.com>, dchinner@...hat.com,
	aelder@....com
Subject: [PATCH 4/4] XFS: Set NOSEC flag early when inode has no xattrs.

From: Andi Kleen <ak@...ux.intel.com>

Set the S_NOSEC flag early if the inode has no xattrs for XFS.
This avoids a single xattr lookup for the first write on every
file, if the file has no xattrs.

Cc: dchinner@...hat.com
Cc: aelder@....com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 fs/xfs/linux-2.6/xfs_iops.c |    3 +++
 fs/xfs/xfs_attr.c           |    2 +-
 fs/xfs/xfs_attr.h           |    1 +
 3 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index dd21784..4ed1e4c 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -763,6 +763,9 @@ xfs_setup_inode(
 		break;
 	}
 
+	if (!is_sgid(inode->i_mode) && !xfs_inode_hasattr(ip))
+		inode->i_flags |= S_NOSEC;
+
 	xfs_iflags_clear(ip, XFS_INEW);
 	barrier();
 
diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c
index c863753..43140db 100644
--- a/fs/xfs/xfs_attr.c
+++ b/fs/xfs/xfs_attr.c
@@ -99,7 +99,7 @@ xfs_attr_name_to_xname(
 	return 0;
 }
 
-STATIC int
+int
 xfs_inode_hasattr(
 	struct xfs_inode	*ip)
 {
diff --git a/fs/xfs/xfs_attr.h b/fs/xfs/xfs_attr.h
index e920d68..20f4038 100644
--- a/fs/xfs/xfs_attr.h
+++ b/fs/xfs/xfs_attr.h
@@ -142,5 +142,6 @@ typedef struct xfs_attr_list_context {
 int xfs_attr_inactive(struct xfs_inode *dp);
 int xfs_attr_rmtval_get(struct xfs_da_args *args);
 int xfs_attr_list_int(struct xfs_attr_list_context *);
+int xfs_inode_hasattr(struct xfs_inode *ip);
 
 #endif	/* __XFS_ATTR_H__ */
-- 
1.7.4.4

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