From 7bf0dc9b0ca9e9b6524b1f70e0898c7f11eb10be Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Tue, 15 Dec 2009 16:46:48 -0800 Subject: [PATCH] ext2: avoid WARN() messages when failing to write to the superblock This fixes a common warning reported by kerneloops.org [Kernel summit hacking hour] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: "Theodore Ts'o" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext2/super.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 1388802b780..f9cb54a585c 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -1105,9 +1105,30 @@ failed_sbi: return ret; } +static void ext2_clear_super_error(struct super_block *sb) +{ + struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; + + if (buffer_write_io_error(sbh)) { + /* + * Oh, dear. A previous attempt to write the + * superblock failed. This could happen because the + * USB device was yanked out. Or it could happen to + * be a transient write error and maybe the block will + * be remapped. Nothing we can do but to retry the + * write and hope for the best. + */ + printk(KERN_ERR "EXT2-fs: %s previous I/O error to " + "superblock detected", sb->s_id); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + } +} + static void ext2_commit_super (struct super_block * sb, struct ext2_super_block * es) { + ext2_clear_super_error(sb); es->s_wtime = cpu_to_le32(get_seconds()); mark_buffer_dirty(EXT2_SB(sb)->s_sbh); sb->s_dirt = 0; @@ -1115,6 +1136,7 @@ static void ext2_commit_super (struct super_block * sb, static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) { + ext2_clear_super_error(sb); es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); es->s_wtime = cpu_to_le32(get_seconds());