Re: [PATCH] do_mounts: try all available filesystems before panicking

[Theodore Ts'o <tytso@xxxxxxx>]

On Sun, May 25, 2014 at 01:04:09PM -0700, Linus Torvalds wrote:
> 
> The fact is, I think xfs is just buggy. Returning 38 (ENOSYS) is
> totally insane. "No such system call"? Somebody is on some bad bad
> drugs. Not that the mount_block_root() loop and error handling might
> not be a good thing to perhaps tweak _too_, but at the very least your
> patch means that now it no longer prints out the error number at all.

There's only a single instance of ENOSYS in fs/xfs/xfs_mount.c:

        /*
         * We must be able to do sector-sized and sector-aligned IO.
         */
        if (sector_size > sbp->sb_sectsize) {
                if (loud)
                        xfs_warn(mp, "device supports %u byte sectors (not %u)",
                                sector_size, sbp->sb_sectsize);
                error = ENOSYS;
                goto release_buf;
        }

Plamen, does changing the ENOSYS to EINVAL above fix things for you?

> Anyway, I'm also not seeing why that xfs error would be new to 3.14,
> though.. Adding the XFS people to the cc.

If I had to guess, commit daba5427d is new to 3.14, and it might
explain the change in behavior.

Cheers,

                                                - Ted