GFS2: Clean up of extended attribute support

This has been on my list for some time. We need to change the way
in which we handle extended attributes to allow faster file creation
times (by reducing the number of transactions required) and the
extended attribute code is the main obstacle to this.

In addition to that, the VFS provides a way to demultiplex the xattr
calls which we ought to be using, rather than rolling our own. This
patch changes the GFS2 code to use that VFS feature and as a result
the code shrinks by a couple of hundred lines or so, and becomes
easier to read.

I'm planning on doing further clean up work in this area, but this
patch is a good start. The cleaned up code also uses the more usual
"xattr" shorthand, I plan to eliminate the use of "eattr" eventually
and in the mean time it serves as a flag as to which bits of the code
have been updated.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 35 insertions, 43 deletions

diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index ce551f85524f..1ee0c2657467 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -26,7 +26,6 @@
 #include "acl.h"
 #include "bmap.h"
 #include "dir.h"
-#include "eaops.h"
 #include "eattr.h"
 #include "glock.h"
 #include "inode.h"
@@ -1302,60 +1301,53 @@ static int gfs2_setxattr(struct dentry *dentry, const char *name,
 			 const void *data, size_t size, int flags)
 {
 	struct inode *inode = dentry->d_inode;
-	struct gfs2_ea_request er;
-
-	memset(&er, 0, sizeof(struct gfs2_ea_request));
-	er.er_type = gfs2_ea_name2type(name, &er.er_name);
-	if (er.er_type == GFS2_EATYPE_UNUSED)
-		return -EOPNOTSUPP;
-	er.er_data = (char *)data;
-	er.er_name_len = strlen(er.er_name);
-	er.er_data_len = size;
-	er.er_flags = flags;
-
-	gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_holder gh;
+	int ret;
 
-	return gfs2_ea_set(GFS2_I(inode), &er);
+	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+	ret = gfs2_glock_nq(&gh);
+	if (ret == 0) {
+		ret = generic_setxattr(dentry, name, data, size, flags);
+		gfs2_glock_dq(&gh);
+	}
+	gfs2_holder_uninit(&gh);
+	return ret;
 }
 
 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
 			     void *data, size_t size)
 {
-	struct gfs2_ea_request er;
-
-	memset(&er, 0, sizeof(struct gfs2_ea_request));
-	er.er_type = gfs2_ea_name2type(name, &er.er_name);
-	if (er.er_type == GFS2_EATYPE_UNUSED)
-		return -EOPNOTSUPP;
-	er.er_data = data;
-	er.er_name_len = strlen(er.er_name);
-	er.er_data_len = size;
-
-	return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
-}
-
-static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
-{
-	struct gfs2_ea_request er;
-
-	memset(&er, 0, sizeof(struct gfs2_ea_request));
-	er.er_data = (size) ? buffer : NULL;
-	er.er_data_len = size;
+	struct inode *inode = dentry->d_inode;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_holder gh;
+	int ret;
 
-	return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
+	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+	ret = gfs2_glock_nq(&gh);
+	if (ret == 0) {
+		ret = generic_getxattr(dentry, name, data, size);
+		gfs2_glock_dq(&gh);
+	}
+	gfs2_holder_uninit(&gh);
+	return ret;
 }
 
 static int gfs2_removexattr(struct dentry *dentry, const char *name)
 {
-	struct gfs2_ea_request er;
-
-	memset(&er, 0, sizeof(struct gfs2_ea_request));
-	er.er_type = gfs2_ea_name2type(name, &er.er_name);
-	if (er.er_type == GFS2_EATYPE_UNUSED)
-		return -EOPNOTSUPP;
-	er.er_name_len = strlen(er.er_name);
+	struct inode *inode = dentry->d_inode;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_holder gh;
+	int ret;
 
-	return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
+	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+	ret = gfs2_glock_nq(&gh);
+	if (ret == 0) {
+		ret = generic_removexattr(dentry, name);
+		gfs2_glock_dq(&gh);
+	}
+	gfs2_holder_uninit(&gh);
+	return ret;
 }
 
 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,