From 14d7e9de0500e9110e5820e2e77d096fc1bab724 Mon Sep 17 00:00:00 2001 From: majianpeng Date: Fri, 1 Feb 2013 19:07:03 +0800 Subject: [PATCH] f2fs: when check superblock failed, try to check another superblock In f2fs, there are two superblocks. So when the first superblock was invalidate, it should try to check another. By Jaegeuk Kim: o Remove a white space for coding style o Clean up for code readability o Fix a typo Signed-off-by: Jianpeng Ma Signed-off-by: Jaegeuk Kim --- fs/f2fs/super.c | 47 +++++++++++++++++++++++++++++++---------------- 1 file changed, 31 insertions(+), 16 deletions(-) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 1d7fe11fea30..ddb665f54d17 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -387,7 +387,7 @@ static int sanity_check_raw_super(struct super_block *sb, /* Currently, support only 4KB page cache size */ if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) { f2fs_msg(sb, KERN_INFO, - "Invalid page_cache_size (%u), supports only 4KB\n", + "Invalid page_cache_size (%lu), supports only 4KB\n", PAGE_CACHE_SIZE); return 1; } @@ -462,6 +462,32 @@ static void init_sb_info(struct f2fs_sb_info *sbi) atomic_set(&sbi->nr_pages[i], 0); } +static int validate_superblock(struct super_block *sb, + struct f2fs_super_block **raw_super, + struct buffer_head **raw_super_buf, sector_t block) +{ + const char *super = (block == 0 ? "first" : "second"); + + /* read f2fs raw super block */ + *raw_super_buf = sb_bread(sb, block); + if (!*raw_super_buf) { + f2fs_msg(sb, KERN_ERR, "unable to read %s superblock", + super); + return 1; + } + + *raw_super = (struct f2fs_super_block *) + ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET); + + /* sanity checking of raw super */ + if (!sanity_check_raw_super(sb, *raw_super)) + return 0; + + f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem " + "in %s superblock", super); + return 1; +} + static int f2fs_fill_super(struct super_block *sb, void *data, int silent) { struct f2fs_sb_info *sbi; @@ -482,16 +508,11 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) goto free_sbi; } - /* read f2fs raw super block */ - raw_super_buf = sb_bread(sb, 0); - if (!raw_super_buf) { - err = -EIO; - f2fs_msg(sb, KERN_ERR, "unable to read superblock"); - goto free_sbi; + if (validate_superblock(sb, &raw_super, &raw_super_buf, 0)) { + brelse(raw_super_buf); + if (validate_superblock(sb, &raw_super, &raw_super_buf, 1)) + goto free_sb_buf; } - raw_super = (struct f2fs_super_block *) - ((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET); - /* init some FS parameters */ sbi->active_logs = NR_CURSEG_TYPE; @@ -507,12 +528,6 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) if (parse_options(sb, sbi, (char *)data)) goto free_sb_buf; - /* sanity checking of raw super */ - if (sanity_check_raw_super(sb, raw_super)) { - f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem"); - goto free_sb_buf; - } - sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize)); sb->s_max_links = F2FS_LINK_MAX; get_random_bytes(&sbi->s_next_generation, sizeof(u32)); -- 2.34.1