linux-kernel - [PATCH 12/18] orangefs: set up and use backing_dev

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Date:   Tue, 12 Dec 2017 13:34:18 -0500
From:   Martin Brandenburg <martin@...ibond.com>
To:     hubcap@...ibond.com, devel@...ts.orangefs.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Martin Brandenburg <martin@...ibond.com>
Subject: [PATCH 12/18] orangefs: set up and use backing_dev_info

From: Martin Brandenburg <martin@...ibond.com>

This is a heavily modified revert of
70823b9bf3290855a7df895d89bd8209182b52e3.

Signed-off-by: Martin Brandenburg <martin@...ibond.com>
---
 fs/orangefs/super.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c
index 366750eef201..314c4a816983 100644
--- a/fs/orangefs/super.c
+++ b/fs/orangefs/super.c
@@ -396,15 +396,11 @@ static int orangefs_fill_sb(struct super_block *sb,
 		struct orangefs_fs_mount_response *fs_mount,
 		void *data, int silent)
 {
-	int ret = -EINVAL;
-	struct inode *root = NULL;
-	struct dentry *root_dentry = NULL;
+	int ret;
+	struct inode *root;
+	struct dentry *root_dentry;
 	struct orangefs_object_kref root_object;
 
-	/* alloc and init our private orangefs sb info */
-	sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
-	if (!ORANGEFS_SB(sb))
-		return -ENOMEM;
 	ORANGEFS_SB(sb)->sb = sb;
 
 	ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
@@ -427,6 +423,10 @@ static int orangefs_fill_sb(struct super_block *sb,
 	sb->s_blocksize_bits = orangefs_bufmap_shift_query();
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 
+	ret = super_setup_bdi(sb);
+	if (ret)
+		return ret;
+
 	root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
 	root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
 	gossip_debug(GOSSIP_SUPER_DEBUG,
@@ -505,6 +505,13 @@ struct dentry *orangefs_mount(struct file_system_type *fst,
 		goto free_op;
 	}
 
+	/* alloc and init our private orangefs sb info */
+	sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
+	if (!ORANGEFS_SB(sb)) {
+		d = ERR_PTR(-ENOMEM);
+		goto free_op;
+	}
+
 	ret = orangefs_fill_sb(sb,
 	      &new_op->downcall.resp.fs_mount, data,
 	      flags & MS_SILENT ? 1 : 0);
-- 
2.15.1