diff options
| author | Fan Yong <fan.yong@intel.com> | 2016-08-16 20:18:49 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-21 13:57:36 (GMT) |
| commit | afebe4a531c1a03a5da3033ffd8984208fdc520c (patch) | |
| tree | 4b353756373117e8141c61d41ae2b07f490706a5 /drivers/staging/lustre | |
| parent | 1d5d5ec110113ce3a3a41adfc183a9e120240bd7 (diff) | |
| download | linux-afebe4a531c1a03a5da3033ffd8984208fdc520c.tar.xz | |
staging: lustre: reorder LOV_MAGIC_* definition
Since all the LOV_MAGIC_* definitions have the same
postfix values break that value out into its own
definition. With this we can check whether the magic's
postfix match the LOV_MAGIC_MAGIC or not: if yes,
then it is quite possible that the clients has
encountered an newer LOV magic. This extra information
can let us handle those cases more gracefully.
Signed-off-by: Fan Yong <fan.yong@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4941
Reviewed-on: http://review.whamcloud.com/10045
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/lustre')
| -rw-r--r-- | drivers/staging/lustre/lustre/include/lustre/lustre_idl.h | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h index d3a9db9..3444add 100644 --- a/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h +++ b/drivers/staging/lustre/lustre/include/lustre/lustre_idl.h @@ -1478,11 +1478,21 @@ enum obdo_flags { OBD_FL_LOCAL_MASK = 0xF0000000, }; -#define LOV_MAGIC_V1 0x0BD10BD0 -#define LOV_MAGIC LOV_MAGIC_V1 -#define LOV_MAGIC_JOIN_V1 0x0BD20BD0 -#define LOV_MAGIC_V3 0x0BD30BD0 -#define LOV_MAGIC_MIGRATE 0x0BD40BD0 +/* + * All LOV EA magics should have the same postfix, if some new version + * Lustre instroduces new LOV EA magic, then when down-grade to an old + * Lustre, even though the old version system does not recognizes such + * new magic, it still can distinguish the corrupted cases by checking + * the magic's postfix. + */ +#define LOV_MAGIC_MAGIC 0x0BD0 +#define LOV_MAGIC_MASK 0xFFFF + +#define LOV_MAGIC_V1 (0x0BD10000 | LOV_MAGIC_MAGIC) +#define LOV_MAGIC_JOIN_V1 (0x0BD20000 | LOV_MAGIC_MAGIC) +#define LOV_MAGIC_V3 (0x0BD30000 | LOV_MAGIC_MAGIC) +#define LOV_MAGIC_MIGRATE (0x0BD40000 | LOV_MAGIC_MAGIC) +#define LOV_MAGIC LOV_MAGIC_V1 /* * magic for fully defined striping |