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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