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Enable ZFS debug flags to be modified via vfs.zfs.debug_flags.

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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)
This commit is contained in:
Will Andrews 2014-09-18 16:55:41 +00:00
parent fbbabf630e
commit f8c2f66a6c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=271788
1 changed files with 27 additions and 0 deletions
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27
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_misc.c
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@ -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.