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Document zfs_flags module parameter

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Add a table describing the debugging flags that can be set in the zfs_flags
module parameter.  Also change the module_param type to 'uint' so users aren't
shown a negative value. The updated man page text is reproduced below for
convenience.

zfs_flags (int)
            Set  additional debugging flags. The following flags may be
            bitwise-or'd together.

            +-------------------------------------------------------+
            |Value   Symbolic Name                                  |
            |        Description                                    |
            +-------------------------------------------------------+
            |    1   ZFS_DEBUG_DPRINTF                              |
            |        Enable dprintf entries in the debug log.       |
            +-------------------------------------------------------+
            |    2   ZFS_DEBUG_DBUF_VERIFY *                        |
            |        Enable extra dbuf verifications.               |
            +-------------------------------------------------------+
            |    4   ZFS_DEBUG_DNODE_VERIFY *                       |
            |        Enable extra dnode verifications.              |
            +-------------------------------------------------------+
            |    8   ZFS_DEBUG_SNAPNAMES                            |
            |        Enable snapshot name verification.             |
            +-------------------------------------------------------+
            |   16   ZFS_DEBUG_MODIFY                               |
            |        Check for illegally modified ARC buffers.      |
            +-------------------------------------------------------+
            |   32   ZFS_DEBUG_SPA                                  |
            |        Enable spa_dbgmsg entries in the debug log.    |
            +-------------------------------------------------------+
            |   64   ZFS_DEBUG_ZIO_FREE                             |
            |        Enable verification of block frees.            |
            +-------------------------------------------------------+
            |  128   ZFS_DEBUG_HISTOGRAM_VERIFY                     |
            |        Enable extra spacemap histogram verifications. |
            +-------------------------------------------------------+
            * Requires debug build.

            Default value: 0.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2988
This commit is contained in:
Ned Bass 2014-12-22 16:54:43 -08:00 committed by Brian Behlendorf
parent 4e30e68caf
commit 33b6dbbc51
2 changed files with 39 additions and 3 deletions
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40
man/man5/zfs-module-parameters.5
View File

@ -822,9 +822,45 @@ Default value: \fB300\fR.
\fBzfs_flags\fR (int)
.ad
.RS 12n
Set additional debugging flags
Set additional debugging flags. The following flags may be bitwise-or'd
together.
.sp
Default value: \fB1\fR.
.TS
box;
rB lB
lB lB
r l.
Value Symbolic Name
Description
_
1 ZFS_DEBUG_DPRINTF
Enable dprintf entries in the debug log.
_
2 ZFS_DEBUG_DBUF_VERIFY *
Enable extra dbuf verifications.
_
4 ZFS_DEBUG_DNODE_VERIFY *
Enable extra dnode verifications.
_
8 ZFS_DEBUG_SNAPNAMES
Enable snapshot name verification.
_
16 ZFS_DEBUG_MODIFY
Check for illegally modified ARC buffers.
_
32 ZFS_DEBUG_SPA
Enable spa_dbgmsg entries in the debug log.
_
64 ZFS_DEBUG_ZIO_FREE
Enable verification of block frees.
_
128 ZFS_DEBUG_HISTOGRAM_VERIFY
Enable extra spacemap histogram verifications.
.TE
.sp
* Requires debug build.
.sp
Default value: \fB0\fR.
.RE
.sp

2
module/zfs/spa_misc.c
View File

@ -1980,7 +1980,7 @@ EXPORT_SYMBOL(spa_mode);
EXPORT_SYMBOL(spa_namespace_lock);
module_param(zfs_flags, int, 0644);
module_param(zfs_flags, uint, 0644);
MODULE_PARM_DESC(zfs_flags, "Set additional debugging flags");
module_param(zfs_recover, int, 0644);