linux-kernel - Re: [PATCH 1/5] f2fs: Introduce some information prints in the mount path

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Date:	Wed, 26 Dec 2012 10:55:33 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH 1/5] f2fs: Introduce some information prints in the mount
 path

Hi,

Could you make them follow the file system convention?
Something like "F2FS: blah blah~".

Otherwise, how about adding a debugging function to express the prefix?
Thanks,

2012-12-22 (토), 12:08 +0900, Namjae Jeon:
> From: Namjae Jeon <namjae.jeon@...sung.com>
> 
> Added few informative prints in the mount path, to convey proper error
> in case of mount failure.
> 
> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
> ---
>  fs/f2fs/super.c |   46 ++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 36 insertions(+), 10 deletions(-)
> 
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index cf0ffb8..86f8549 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -342,19 +342,29 @@ static int sanity_check_raw_super(struct f2fs_super_block *raw_super)
>  {
>  	unsigned int blocksize;
>  
> -	if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic))
> +	if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
> +		pr_info("Magic Mismatch, valid(0x%x) - read(0x%x)\n",
> +			F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
>  		return 1;
> +	}
>  
>  	/* Currently, support only 4KB block size */
>  	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
> -	if (blocksize != PAGE_CACHE_SIZE)
> +	if (blocksize != PAGE_CACHE_SIZE) {
> +		pr_info("Not valid blocksize (%u), supports only 4KB\n",
> +			blocksize);
>  		return 1;
> +	}
>  	if (le32_to_cpu(raw_super->log_sectorsize) !=
> -					F2FS_LOG_SECTOR_SIZE)
> +					F2FS_LOG_SECTOR_SIZE) {
> +		pr_info("Not valid log sectorsize\n");
>  		return 1;
> +	}
>  	if (le32_to_cpu(raw_super->log_sectors_per_block) !=
> -					F2FS_LOG_SECTORS_PER_BLOCK)
> +					F2FS_LOG_SECTORS_PER_BLOCK) {
> +			pr_info("Not valid log sectors per block\n");
>  		return 1;
> +	}
>  	return 0;
>  }
>  
> @@ -415,13 +425,16 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  		return -ENOMEM;
>  
>  	/* set a temporary block size */
> -	if (!sb_set_blocksize(sb, F2FS_BLKSIZE))
> +	if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
> +		pr_err("unable to set blocksize\n");
>  		goto free_sbi;
> +	}
>  
>  	/* read f2fs raw super block */
>  	raw_super_buf = sb_bread(sb, 0);
>  	if (!raw_super_buf) {
>  		err = -EIO;
> +		pr_err("unable to read superblock\n");
>  		goto free_sbi;
>  	}
>  	raw_super = (struct f2fs_super_block *)
> @@ -443,8 +456,10 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  		goto free_sb_buf;
>  
>  	/* sanity checking of raw super */
> -	if (sanity_check_raw_super(raw_super))
> +	if (sanity_check_raw_super(raw_super)) {
> +		pr_err("Not a valid F2FS filesystem\n");
>  		goto free_sb_buf;
> +	}
>  
>  	sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
>  	sb->s_max_links = F2FS_LINK_MAX;
> @@ -478,18 +493,23 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  	/* get an inode for meta space */
>  	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
>  	if (IS_ERR(sbi->meta_inode)) {
> +		pr_err("Failed to read F2FS meta data inode\n");
>  		err = PTR_ERR(sbi->meta_inode);
>  		goto free_sb_buf;
>  	}
>  
>  	err = get_valid_checkpoint(sbi);
> -	if (err)
> +	if (err) {
> +		pr_err("Failed to get valid F2FS checkpoint\n");
>  		goto free_meta_inode;
> +	}
>  
>  	/* sanity checking of checkpoint */
>  	err = -EINVAL;
> -	if (sanity_check_ckpt(raw_super, sbi->ckpt))
> +	if (sanity_check_ckpt(raw_super, sbi->ckpt)) {
> +		pr_err("Not a valid F2FS checkpoint\n");
>  		goto free_cp;
> +	}
>  
>  	sbi->total_valid_node_count =
>  				le32_to_cpu(sbi->ckpt->valid_node_count);
> @@ -511,17 +531,22 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  
>  	/* setup f2fs internal modules */
>  	err = build_segment_manager(sbi);
> -	if (err)
> +	if (err) {
> +		pr_err("Failed to initialize F2FS segment manager\n");
>  		goto free_sm;
> +	}
>  	err = build_node_manager(sbi);
> -	if (err)
> +	if (err) {
> +		pr_err("Failed to initialize F2FS node manager\n");
>  		goto free_nm;
> +	}
>  
>  	build_gc_manager(sbi);
>  
>  	/* get an inode for node space */
>  	sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
>  	if (IS_ERR(sbi->node_inode)) {
> +		pr_err("Failed to read node inode\n");
>  		err = PTR_ERR(sbi->node_inode);
>  		goto free_nm;
>  	}
> @@ -534,6 +559,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>  	/* read root inode and dentry */
>  	root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
>  	if (IS_ERR(root)) {
> +		pr_err("Failed to read root inode\n");
>  		err = PTR_ERR(root);
>  		goto free_node_inode;
>  	}

-- 
Jaegeuk Kim
Samsung

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