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authorToshi Kani <toshi.kani@hpe.com>2016-06-28 13:37:15 -0600
committerMike Snitzer <snitzer@redhat.com>2016-07-20 23:49:52 -0400
commitb5ab4a9ba5574430870391e93b125ada31217c4c (patch)
tree658d76b461e4d7d4e064068e82aa0550d61deb70 /drivers/md/dm-ioctl.c
parentf6e629bd2379dceb547be93915314307871a7f6c (diff)
downloadlinux-b5ab4a9ba5574430870391e93b125ada31217c4c.tar.bz2
dm: allow bio-based table to be upgraded to bio-based with DAX support
Allow table type DM_TYPE_BIO_BASED to extend with DM_TYPE_DAX_BIO_BASED since DM_TYPE_DAX_BIO_BASED supports bio-based requests. This is needed to allow a snapshot of an LV with DAX support to be removed. One of the intermediate table reloads that lvm2 does switches from DM_TYPE_BIO_BASED to DM_TYPE_DAX_BIO_BASED. No known reason to disallow this so... Signed-off-by: Toshi Kani <toshi.kani@hpe.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-ioctl.c')
-rw-r--r--drivers/md/dm-ioctl.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 96df89a31f42..966eb4b61aed 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1267,6 +1267,15 @@ static int populate_table(struct dm_table *table,
return dm_table_complete(table);
}
+static bool is_valid_type(unsigned cur, unsigned new)
+{
+ if (cur == new ||
+ (cur == DM_TYPE_BIO_BASED && new == DM_TYPE_DAX_BIO_BASED))
+ return true;
+
+ return false;
+}
+
static int table_load(struct dm_ioctl *param, size_t param_size)
{
int r;
@@ -1309,7 +1318,7 @@ static int table_load(struct dm_ioctl *param, size_t param_size)
DMWARN("unable to set up device queue for new table.");
goto err_unlock_md_type;
}
- } else if (dm_get_md_type(md) != dm_table_get_type(t)) {
+ } else if (!is_valid_type(dm_get_md_type(md), dm_table_get_type(t))) {
DMWARN("can't change device type after initial table load.");
r = -EINVAL;
goto err_unlock_md_type;