Date: Thu, 18 Sep 2014 16:55:42 +0000 (UTC) From: Will Andrews <will@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r271788 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <201409181655.s8IGtgft042984@svn.freebsd.org>
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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) 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.
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