linux-kernel - [PATCH 06/19] f2fs: introduce f2fs_commit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri,  1 May 2015 17:48:33 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 06/19] f2fs: introduce f2fs_commit_super

This patch introduces f2fs_commit_super to write updated superblock.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/f2fs.h  |  1 +
 fs/f2fs/super.c | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c98454d..7ff3ac7 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1535,6 +1535,7 @@ static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
 /*
  * super.c
  */
+int f2fs_commit_super(struct f2fs_sb_info *);
 int f2fs_sync_fs(struct super_block *, int);
 extern __printf(3, 4)
 void f2fs_msg(struct super_block *, const char *, const char *, ...);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index b2dd1b0..8584168 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -966,6 +966,30 @@ retry:
 	return 0;
 }
 
+int f2fs_commit_super(struct f2fs_sb_info *sbi)
+{
+	struct buffer_head *sbh = sbi->raw_super_buf;
+	sector_t block = sbh->b_blocknr;
+	int err;
+
+	/* write back-up superblock first */
+	sbh->b_blocknr = block ? 0 : 1;
+	mark_buffer_dirty(sbh);
+	err = sync_dirty_buffer(sbh);
+
+	sbh->b_blocknr = block;
+	if (err)
+		goto out;
+
+	/* write current valid superblock */
+	mark_buffer_dirty(sbh);
+	err = sync_dirty_buffer(sbh);
+out:
+	clear_buffer_write_io_error(sbh);
+	set_buffer_uptodate(sbh);
+	return err;
+}
+
 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct f2fs_sb_info *sbi;
-- 
2.1.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/