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| author | NeilBrown <neilb@suse.de> | 2011-07-28 11:31:47 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-07-28 11:31:47 +1000 |
| commit | 2699b67223aca6b1450fc2f72e40fada952afc85 (patch) | |
| tree | c84d0cbb763ad03cd770a218a37f0f1ec31118af /include | |
| parent | 34b343cff4354ab9864be83be88405fd53d928a0 (diff) | |
| download | lwn-2699b67223aca6b1450fc2f72e40fada952afc85.tar.gz lwn-2699b67223aca6b1450fc2f72e40fada952afc85.zip | |
md: load/store badblock list from v1.x metadata
Space must have been allocated when array was created.
A feature flag is set when the badblock list is non-empty, to
ensure old kernels don't load and trust the whole device.
We only update the on-disk badblocklist when it has changed.
If the badblocklist (or other metadata) is stored on a bad block, we
don't cope very well.
If metadata has no room for bad block, flag bad-blocks as disabled,
and do the same for 0.90 metadata.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/raid/md_p.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/include/linux/raid/md_p.h b/include/linux/raid/md_p.h index 75cbf4f62fe8..9e65d9e20662 100644 --- a/include/linux/raid/md_p.h +++ b/include/linux/raid/md_p.h @@ -245,10 +245,16 @@ struct mdp_superblock_1 { __u8 device_uuid[16]; /* user-space setable, ignored by kernel */ __u8 devflags; /* per-device flags. Only one defined...*/ #define WriteMostly1 1 /* mask for writemostly flag in above */ - __u8 pad2[64-57]; /* set to 0 when writing */ + /* Bad block log. If there are any bad blocks the feature flag is set. + * If offset and size are non-zero, that space is reserved and available + */ + __u8 bblog_shift; /* shift from sectors to block size */ + __le16 bblog_size; /* number of sectors reserved for list */ + __le32 bblog_offset; /* sector offset from superblock to bblog, + * signed - not unsigned */ /* array state information - 64 bytes */ - __le64 utime; /* 40 bits second, 24 btes microseconds */ + __le64 utime; /* 40 bits second, 24 bits microseconds */ __le64 events; /* incremented when superblock updated */ __le64 resync_offset; /* data before this offset (from data_offset) known to be in sync */ __le32 sb_csum; /* checksum up to devs[max_dev] */ @@ -270,8 +276,8 @@ struct mdp_superblock_1 { * must be honoured */ #define MD_FEATURE_RESHAPE_ACTIVE 4 +#define MD_FEATURE_BAD_BLOCKS 8 /* badblock list is not empty */ -#define MD_FEATURE_ALL (1|2|4) +#define MD_FEATURE_ALL (1|2|4|8) #endif - |