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Date:   Fri, 28 Apr 2023 11:39:12 +0800
From:   Jason Yan <yanaijie@...wei.com>
To:     Theodore Ts'o <tytso@....edu>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>
CC:     Andreas Dilger <adilger@...ger.ca>,
        Andreas Dilger <adilger.kernel@...ger.ca>
Subject: Re: [PATCH 2/3] ext4: reflect error codes from
 ext4_multi_mount_protect() to its callers

On 2023/4/28 11:16, Theodore Ts'o wrote:
> This will allow more fine-grained errno codes to be returned by the
> mount system call.
> 
> Cc: Andreas Dilger <adilger.kernel@...ger.ca>
> Signed-off-by: Theodore Ts'o <tytso@....edu>
> ---
>   fs/ext4/mmp.c   |  9 ++++++++-
>   fs/ext4/super.c | 14 +++++++++-----
>   2 files changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
> index 4681fff6665f..4022bc713421 100644
> --- a/fs/ext4/mmp.c
> +++ b/fs/ext4/mmp.c
> @@ -282,6 +282,7 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   	if (mmp_block < le32_to_cpu(es->s_first_data_block) ||
>   	    mmp_block >= ext4_blocks_count(es)) {
>   		ext4_warning(sb, "Invalid MMP block in superblock");
> +		retval = -EINVAL;
>   		goto failed;
>   	}
>   
> @@ -307,6 +308,7 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   
>   	if (seq == EXT4_MMP_SEQ_FSCK) {
>   		dump_mmp_msg(sb, mmp, "fsck is running on the filesystem");
> +		retval = -EBUSY;
>   		goto failed;
>   	}
>   
> @@ -320,6 +322,7 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   
>   	if (schedule_timeout_interruptible(HZ * wait_time) != 0) {
>   		ext4_warning(sb, "MMP startup interrupted, failing mount\n");
> +		retval = -ETIMEDOUT;
>   		goto failed;
>   	}
>   
> @@ -330,6 +333,7 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   	if (seq != le32_to_cpu(mmp->mmp_seq)) {
>   		dump_mmp_msg(sb, mmp,
>   			     "Device is already active on another node.");
> +		retval = -EBUSY;
>   		goto failed;
>   	}
>   
> @@ -349,6 +353,7 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   	 */
>   	if (schedule_timeout_interruptible(HZ * wait_time) != 0) {
>   		ext4_warning(sb, "MMP startup interrupted, failing mount");
> +		retval = -ETIMEDOUT;
>   		goto failed;
>   	}
>   
> @@ -359,6 +364,7 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   	if (seq != le32_to_cpu(mmp->mmp_seq)) {
>   		dump_mmp_msg(sb, mmp,
>   			     "Device is already active on another node.");
> +		retval = -EBUSY;
>   		goto failed;
>   	}
>   
> @@ -378,6 +384,7 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   		EXT4_SB(sb)->s_mmp_tsk = NULL;
>   		ext4_warning(sb, "Unable to create kmmpd thread for %s.",
>   			     sb->s_id);
> +		retval = -ENOMEM;
>   		goto failed;
>   	}
>   
> @@ -385,5 +392,5 @@ int ext4_multi_mount_protect(struct super_block *sb,
>   
>   failed:
>   	brelse(bh);
> -	return 1;
> +	return retval;
>   }
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index b11907e1fab2..9a8af70815b1 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -5329,9 +5329,11 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
>   			  ext4_has_feature_orphan_present(sb) ||
>   			  ext4_has_feature_journal_needs_recovery(sb));
>   
> -	if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
> -		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
> +	if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) {
> +		err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block));
> +		if (err)
>   			goto failed_mount3a;
> +	}
>   
>   	/*
>   	 * The first inode we look at is the journal inode.  Don't try
> @@ -6566,12 +6568,14 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
>   				goto restore_opts;
>   
>   			sb->s_flags &= ~SB_RDONLY;
> -			if (ext4_has_feature_mmp(sb))
> -				if (ext4_multi_mount_protect(sb,
> -						le64_to_cpu(es->s_mmp_block))) {
> +			if (ext4_has_feature_mmp(sb)) {
> +				err = ext4_multi_mount_protect(sb,
> +						le64_to_cpu(es->s_mmp_block));
> +				if (err) {
>   					err = -EROFS;

So shall we return the fine-grained errno from 
ext4_multi_mount_protect() instead of -EROFS here?

Thanks,
Jason

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