On 18/09/2014 19:55, Will Andrews wrote:
> Author: will
> Date: Thu Sep 18 16:55:41 2014
> New Revision: 271788
> URL: http://svnweb.freebsd.org/changeset/base/271788
>
> Log:
> Enable ZFS debug flags to be modified via vfs.zfs.debug_flags.
>
> This is primarily only of interest to ZFS developers, but it makes it
> easier to get additional debugging.
>
> Submitted by: gibbs
> MFC after: 1 month
> Sponsored by: Spectra Logic
> MFSpectraBSD: 517074 on 2011/12/15 (by will), 662343 on 2013/03/20
> (by gibbs)
zfs_flags was already accessible via debug.zfs_flags sysctl and tunable.
That should probably be removed now?
> Modified:
> head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c
>
> Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c
> ==============================================================================
> --- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c Thu Sep
> 18 16:53:44 2014 (r271787)
> +++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c Thu Sep
> 18 16:55:41 2014 (r271788)
> @@ -259,6 +259,33 @@ SYSCTL_DECL(_vfs_zfs);
> SYSCTL_INT(_vfs_zfs, OID_AUTO, recover, CTLFLAG_RDTUN, &zfs_recover, 0,
> "Try to recover from otherwise-fatal errors.");
>
> +static int
> +sysctl_vfs_zfs_debug_flags(SYSCTL_HANDLER_ARGS)
> +{
> + int err, val;
> +
> + val = zfs_flags;
> + err = sysctl_handle_int(oidp, &val, 0, req);
> + if (err != 0 || req->newptr == NULL)
> + return (err);
> +
> + /*
> + * ZFS_DEBUG_MODIFY must be enabled prior to boot so all
> + * arc buffers in the system have the necessary additional
> + * checksum data. However, it is safe to disable at any
> + * time.
> + */
> + if (!(zfs_flags & ZFS_DEBUG_MODIFY))
> + val &= ~ZFS_DEBUG_MODIFY;
> + zfs_flags = val;
> +
> + return (0);
> +}
> +TUNABLE_INT("vfs.zfs.debug_flags", &zfs_flags);
> +SYSCTL_PROC(_vfs_zfs, OID_AUTO, debug_flags,
> + CTLTYPE_UINT | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(int),
> + sysctl_vfs_zfs_debug_flags, "IU", "Debug flags for ZFS testing.");
> +
> /*
> * If destroy encounters an EIO while reading metadata (e.g. indirect
> * blocks), space referenced by the missing metadata can not be freed.
>
--
Andriy Gapon
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