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| author | Joe Thornber <ejt@redhat.com> | 2012-07-27 18:08:15 +0400 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-07-27 18:08:15 +0400 |
| commit | 310975573ba40ab526b0d76d28225d8d0999d72b (patch) | |
| tree | 3ad362bb4fc0c70662c7337723222df16611f2eb /drivers/md/persistent-data/dm-block-manager.h | |
| parent | 4afdd680f7c106e1c87b6dd7af9751c282ecb4b0 (diff) | |
| download | linux-310975573ba40ab526b0d76d28225d8d0999d72b.tar.xz | |
dm persistent data: introduce dm_bm_set_read_only
Introduce dm_bm_set_read_only to switch the block manager into a
read-only mode. To be used when dm-thin degrades due to io errors on
the metadata device.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/persistent-data/dm-block-manager.h')
| -rw-r--r-- | drivers/md/persistent-data/dm-block-manager.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/md/persistent-data/dm-block-manager.h b/drivers/md/persistent-data/dm-block-manager.h index 327885566631..be5bff61be28 100644 --- a/drivers/md/persistent-data/dm-block-manager.h +++ b/drivers/md/persistent-data/dm-block-manager.h @@ -108,6 +108,19 @@ int dm_bm_unlock(struct dm_block *b); int dm_bm_flush_and_unlock(struct dm_block_manager *bm, struct dm_block *superblock); +/* + * Switches the bm to a read only mode. Once read-only mode + * has been entered the following functions will return -EPERM. + * + * dm_bm_write_lock + * dm_bm_write_lock_zero + * dm_bm_flush_and_unlock + * + * Additionally you should not use dm_bm_unlock_move, however no error will + * be returned if you do. + */ +void dm_bm_set_read_only(struct dm_block_manager *bm); + u32 dm_bm_checksum(const void *data, size_t len, u32 init_xor); /*----------------------------------------------------------------*/ |