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author | Mike Snitzer <snitzer@redhat.com> | 2014-02-12 23:58:15 -0500 |
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committer | Mike Snitzer <snitzer@redhat.com> | 2014-02-27 11:49:08 -0500 |
commit | 7d48935eff401bb7970e73e822871a10e3643df1 (patch) | |
tree | cc7523512553a162b66e37d022da2c2e8acfee22 /drivers/md/dm-thin-metadata.h | |
parent | a1989b330093578ea5470bea0a00f940c444c466 (diff) | |
download | linux-7d48935eff401bb7970e73e822871a10e3643df1.tar.bz2 |
dm thin: allow metadata space larger than supported to go unused
It was always intended that a user could provide a thin metadata device
that is larger than the max supported by the on-disk format. The extra
space would just go unused.
Unfortunately that never worked. If the user attempted to use a larger
metadata device on creation they would get an error like the following:
device-mapper: space map common: space map too large
device-mapper: transaction manager: couldn't create metadata space map
device-mapper: thin metadata: tm_create_with_sm failed
device-mapper: table: 252:17: thin-pool: Error creating metadata object
device-mapper: ioctl: error adding target to table
Fix this by allowing the initial metadata space map creation to cap its
size at the max number of blocks supported (DM_SM_METADATA_MAX_BLOCKS).
get_metadata_dev_size() must also impose DM_SM_METADATA_MAX_BLOCKS (via
THIN_METADATA_MAX_SECTORS), otherwise extending metadata would cap at
THIN_METADATA_MAX_SECTORS_WARNING (which is larger than supported).
Also, the calculation for THIN_METADATA_MAX_SECTORS didn't account for
the sizeof the disk_bitmap_header. So the supported maximum metadata
size is a bit smaller (reduced from 33423360 to 33292800 sectors).
Lastly, remove the "excess space will not be used" warning message from
get_metadata_dev_size(); it resulted in printing the warning multiple
times. Factor out warn_if_metadata_device_too_big(), call it from
pool_ctr() and maybe_resize_metadata_dev().
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Diffstat (limited to 'drivers/md/dm-thin-metadata.h')
-rw-r--r-- | drivers/md/dm-thin-metadata.h | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h index dd6088a17a65..82ea384d36ff 100644 --- a/drivers/md/dm-thin-metadata.h +++ b/drivers/md/dm-thin-metadata.h @@ -9,16 +9,14 @@ #include "persistent-data/dm-block-manager.h" #include "persistent-data/dm-space-map.h" +#include "persistent-data/dm-space-map-metadata.h" -#define THIN_METADATA_BLOCK_SIZE 4096 +#define THIN_METADATA_BLOCK_SIZE DM_SM_METADATA_BLOCK_SIZE /* * The metadata device is currently limited in size. - * - * We have one block of index, which can hold 255 index entries. Each - * index entry contains allocation info about 16k metadata blocks. */ -#define THIN_METADATA_MAX_SECTORS (255 * (1 << 14) * (THIN_METADATA_BLOCK_SIZE / (1 << SECTOR_SHIFT))) +#define THIN_METADATA_MAX_SECTORS DM_SM_METADATA_MAX_SECTORS /* * A metadata device larger than 16GB triggers a warning. |