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| author | Mike Snitzer <snitzer@redhat.com> | 2012-03-28 18:41:28 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-03-28 18:41:28 +0100 |
| commit | c4a69ecdb463a901b4645230613961e134e897cd (patch) | |
| tree | c53e0a569f3d390ea2a97f964225d5383c6401ec /drivers/md/dm-thin-metadata.c | |
| parent | 71fd5ae25d88841c08d5bbea90c0f0a12ca05509 (diff) | |
| download | op-kernel-dev-c4a69ecdb463a901b4645230613961e134e897cd.zip op-kernel-dev-c4a69ecdb463a901b4645230613961e134e897cd.tar.gz | |
dm thin: relax hard limit on the maximum size of a metadata device
The thin metadata format can only make use of a device that is <=
THIN_METADATA_MAX_SECTORS (currently 15.9375 GB). Therefore, there is no
practical benefit to using a larger device.
However, it may be that other factors impose a certain granularity for
the space that is allocated to a device (E.g. lvm2 can impose a coarse
granularity through the use of large, >= 1 GB, physical extents).
Rather than reject a larger metadata device, during thin-pool device
construction, switch to allowing it but issue a warning if a device
larger than THIN_METADATA_MAX_SECTORS_WARNING (16 GB) is
provided. Any space over 15.9375 GB will not be used.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-thin-metadata.c')
| -rw-r--r-- | drivers/md/dm-thin-metadata.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index a680c76..737d388 100644 --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -713,6 +713,9 @@ struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev, if (r) goto bad; + if (bdev_size > THIN_METADATA_MAX_SECTORS) + bdev_size = THIN_METADATA_MAX_SECTORS; + disk_super = dm_block_data(sblock); disk_super->magic = cpu_to_le64(THIN_SUPERBLOCK_MAGIC); disk_super->version = cpu_to_le32(THIN_VERSION); |
