linux-kernel - Re: [PATCH 3/3] ext4: Add support for FS_IOC

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Message-ID: <l3dzlrzaekbxjryazwiqtdtckvl4aundfmwff2w4exuweg4hbc@2zsrlptoeufv>
Date: Fri, 15 Mar 2024 12:50:39 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Theodore Ts'o <tytso@....edu>
Cc: torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Christian Brauner <brauner@...nel.org>, 
	Andreas Dilger <adilger.kernel@...ger.ca>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/3] ext4: Add support for FS_IOC_GETFSSYSFSPATH

On Fri, Mar 15, 2024 at 12:45:50PM -0400, Theodore Ts'o wrote:
> On Thu, Mar 14, 2024 at 11:53:02PM -0400, Kent Overstreet wrote:
> > the new sysfs path ioctl lets us get the /sys/fs/ path for a given
> > filesystem in a fs agnostic way, potentially nudging us towards
> > standarizing some of our reporting.
> > 
> > --- a/fs/ext4/super.c
> > +++ b/fs/ext4/super.c
> > @@ -5346,6 +5346,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
> >  	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
> >  #endif
> >  	super_set_uuid(sb, es->s_uuid, sizeof(es->s_uuid));
> > +	super_set_sysfs_name_bdev(sb);
> 
> Should we perhaps be hoisting this call up to the VFS layer, so that
> all file systems would benefit?

I did as much hoisting as I could. For some filesystems (single device
filesystems) the sysfs name is the block device, for the multi device
filesystems I've looked at it's the UUID.