[GFS2] Remove support for unused and pointless flag

The ability to mark files for direct i/o access when opened
normally is both unused and pointless, so this patch removes
support for that feature.

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

fs/gfs2/incore.h

@@ -421,7 +421,6 @@ struct gfs2_tune {
 	unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
 	unsigned int gt_atime_quantum; /* Min secs between atime updates */
 	unsigned int gt_new_files_jdata;
-	unsigned int gt_new_files_directio;
 	unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 	unsigned int gt_stall_secs; /* Detects trouble! */
 	unsigned int gt_complain_secs;

fs/gfs2/inode.c

@@ -789,12 +789,7 @@ static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
 		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
 		    gfs2_tune_get(sdp, gt_new_files_jdata))
 			di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
-		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
-		    gfs2_tune_get(sdp, gt_new_files_directio))
-			di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
 	} else if (S_ISDIR(mode)) {
-		di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
-					    GFS2_DIF_INHERIT_DIRECTIO);
 		di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
 					    GFS2_DIF_INHERIT_JDATA);
 	}

fs/gfs2/ops_file.c

@@ -134,7 +134,6 @@ static const u32 fsflags_to_gfs2[32] = {
 	[7] = GFS2_DIF_NOATIME,
 	[12] = GFS2_DIF_EXHASH,
 	[14] = GFS2_DIF_INHERIT_JDATA,
-	[20] = GFS2_DIF_INHERIT_DIRECTIO,
 };
 
 static const u32 gfs2_to_fsflags[32] = {
@@ -143,7 +142,6 @@ static const u32 gfs2_to_fsflags[32] = {
 	[gfs2fl_AppendOnly] = FS_APPEND_FL,
 	[gfs2fl_NoAtime] = FS_NOATIME_FL,
 	[gfs2fl_ExHash] = FS_INDEX_FL,
-	[gfs2fl_InheritDirectio] = FS_DIRECTIO_FL,
 	[gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
 };
 
@@ -161,12 +159,8 @@ static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
 		return error;
 
 	fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
-	if (!S_ISDIR(inode->i_mode)) {
-		if (ip->i_di.di_flags & GFS2_DIF_JDATA)
-			fsflags |= FS_JOURNAL_DATA_FL;
-		if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
-			fsflags |= FS_DIRECTIO_FL;
-	}
+	if (!S_ISDIR(inode->i_mode) && ip->i_di.di_flags & GFS2_DIF_JDATA)
+		fsflags |= FS_JOURNAL_DATA_FL;
 	if (put_user(fsflags, ptr))
 		error = -EFAULT;
 
@@ -195,13 +189,11 @@ void gfs2_set_inode_flags(struct inode *inode)
 
 /* Flags that can be set by user space */
 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA|			\
-			     GFS2_DIF_DIRECTIO|			\
 			     GFS2_DIF_IMMUTABLE|		\
 			     GFS2_DIF_APPENDONLY|		\
 			     GFS2_DIF_NOATIME|			\
 			     GFS2_DIF_SYNC|			\
 			     GFS2_DIF_SYSTEM|			\
-			     GFS2_DIF_INHERIT_DIRECTIO|		\
 			     GFS2_DIF_INHERIT_JDATA)
 
 /**
@@ -292,8 +284,6 @@ static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
 	if (!S_ISDIR(inode->i_mode)) {
 		if (gfsflags & GFS2_DIF_INHERIT_JDATA)
 			gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
-		if (gfsflags & GFS2_DIF_INHERIT_DIRECTIO)
-			gfsflags ^= (GFS2_DIF_DIRECTIO | GFS2_DIF_INHERIT_DIRECTIO);
 		return do_gfs2_set_flags(filp, gfsflags, ~0);
 	}
 	return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
@@ -494,11 +484,6 @@ static int gfs2_open(struct inode *inode, struct file *file)
 			goto fail_gunlock;
 		}
 
-		/* Listen to the Direct I/O flag */
-
-		if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
-			file->f_flags |= O_DIRECT;
-
 		gfs2_glock_dq_uninit(&i_gh);
 	}
 

fs/gfs2/super.c

@@ -65,7 +65,6 @@ void gfs2_tune_init(struct gfs2_tune *gt)
 	gt->gt_quota_quantum = 60;
 	gt->gt_atime_quantum = 3600;
 	gt->gt_new_files_jdata = 0;
-	gt->gt_new_files_directio = 0;
 	gt->gt_max_readahead = 1 << 18;
 	gt->gt_stall_secs = 600;
 	gt->gt_complain_secs = 10;

fs/gfs2/sys.c

@@ -412,7 +412,6 @@ TUNE_ATTR(max_readahead, 0);
 TUNE_ATTR(complain_secs, 0);
 TUNE_ATTR(statfs_slow, 0);
 TUNE_ATTR(new_files_jdata, 0);
-TUNE_ATTR(new_files_directio, 0);
 TUNE_ATTR(quota_simul_sync, 1);
 TUNE_ATTR(quota_cache_secs, 1);
 TUNE_ATTR(stall_secs, 1);
@@ -441,7 +440,6 @@ static struct attribute *tune_attrs[] = {
 	&tune_attr_quotad_secs.attr,
 	&tune_attr_quota_scale.attr,
 	&tune_attr_new_files_jdata.attr,
-	&tune_attr_new_files_directio.attr,
 	NULL,
 };