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| author |   Shaohua Li <shli@fb.com> | 2015-08-13 14:31:56 -0700 |
|---|---|---|
| committer |   NeilBrown <neilb@suse.com> | 2015-10-24 17:16:18 +1100 |
| commit | 3069aa8def32b0c2b83cd27d1c37ed30b47ce879 (patch) | |
| tree | a2e8141984b338b15a0d940f416e48177acd2801 /include/uapi/linux/raid | |
| parent | MD: add a new disk role to present write journal device (diff) | |
| download | wireguard-linux-3069aa8def32b0c2b83cd27d1c37ed30b47ce879.tar.xz wireguard-linux-3069aa8def32b0c2b83cd27d1c37ed30b47ce879.zip | |
md: override md superblock recovery_offset for journal device
Journal device stores data in a log structure. We need record the log
start. Here we override md superblock recovery_offset for this purpose.
This field of a journal device is meaningless otherwise.
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'include/uapi/linux/raid')
| -rw-r--r-- | include/uapi/linux/raid/md_p.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h index eaaab52077a3..a5f54ff26c20 100644 --- a/include/uapi/linux/raid/md_p.h +++ b/include/uapi/linux/raid/md_p.h @@ -258,7 +258,10 @@ struct mdp_superblock_1 { __le64 data_offset; /* sector start of data, often 0 */ __le64 data_size; /* sectors in this device that can be used for data */ __le64 super_offset; /* sector start of this superblock */ - __le64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */ + union { + __le64 recovery_offset;/* sectors before this offset (from data_offset) have been recovered */ + __le64 journal_tail;/* journal tail of journal device (from data_offset) */ + }; __le32 dev_number; /* permanent identifier of this device - not role in raid */ __le32 cnt_corrected_read; /* number of read errors that were corrected by re-writing */ __u8 device_uuid[16]; /* user-space setable, ignored by kernel */ |