Re: [PATCH] reiserfs: fix handling of device names with /'s in them

From: Hans Reiser
Date: Sun Jul 16 2006 - 03:11:22 EST

So the Plan 9 and Unix way would be to let the driver parse the number
part of the name after the last slash. What I don't understand is why
reiserfs is getting involved here, rather than recognizing the driver as
an extension of the namespace, seeing the driver as a mountpoint, and
just passing number to the driver. There must be something I don't
grasp here, can you help me?


Jeff Mahoney wrote:

> Bodo Eggert wrote:
> >Eric Dumazet <dada1@xxxxxxxxxxxxx> wrote:
> >>On Wednesday 12 July 2006 18:42, Jeff Mahoney wrote:
> >>> On systems with block devices containing slashes (virtual dasd, cciss,
> >>> etc), reiserfs will fail to initialize /proc/fs/reiserfs/<dev> due to
> >>> it being interpreted as a subdirectory. The generic block device code
> >>> changes the / to ! for use in the sysfs tree. This patch uses that
> >>> convention.
> >>>
> >>> Tested by making dm devices use dm/<number> rather than dm-<number>
> >>
> >>Your patch handles at most one slash. But the description mentions
> 'slashes'
> >>(ie several slashes)
> >Besides that, there is no reason to prevent the user from using many
> slashes.
> >OTOH, I'd prefer propper quoting, but having each driver do this would be
> >insane.
> The strings aren't user-supplied, they're kernel-internal names of block
> devices, supplied by the driver. At present there is no possibility of
> more than one slash in the name, and I doubt we'll see any new devices
> with one slash in them, never mind more than one.
> -Jeff
> --
> Jeff Mahoney
> SUSE Labs

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