6.1-stable review patch. If anyone has any objections, please let me know.
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From: Benjamin Marzinski bmarzins@redhat.com
[ Upstream commit 9eb7109a5bfc5b8226e9517e9f3cc6d414391884 ]
__bind was changing the disk capacity, geometry and mempools of the mapped device before calling dm_table_set_restrictions() which could fail, forcing dm to drop the new table. Failing here would leave the device using the old table but with the wrong capacity and mempools.
Move dm_table_set_restrictions() earlier in __bind(). Since it needs the capacity to be set, save the old version and restore it on failure.
Fixes: bb37d77239af2 ("dm: introduce zone append emulation") Reviewed-by: Damien Le Moal dlemoal@kernel.org Tested-by: Damien Le Moal dlemoal@kernel.org Signed-off-by: Benjamin Marzinski bmarzins@redhat.com Signed-off-by: Mikulas Patocka mpatocka@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/dm.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 4767265793de7..2b8fe98c515ed 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2165,21 +2165,29 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, struct queue_limits *limits) { struct dm_table *old_map; - sector_t size; + sector_t size, old_size; int ret;
lockdep_assert_held(&md->suspend_lock);
size = dm_table_get_size(t);
+ old_size = dm_get_size(md); + set_capacity(md->disk, size); + + ret = dm_table_set_restrictions(t, md->queue, limits); + if (ret) { + set_capacity(md->disk, old_size); + old_map = ERR_PTR(ret); + goto out; + } + /* * Wipe any geometry if the size of the table changed. */ - if (size != dm_get_size(md)) + if (size != old_size) memset(&md->geometry, 0, sizeof(md->geometry));
- set_capacity(md->disk, size); - dm_table_event_callback(t, event_callback, md);
if (dm_table_request_based(t)) { @@ -2212,12 +2220,6 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, t->mempools = NULL; }
- ret = dm_table_set_restrictions(t, md->queue, limits); - if (ret) { - old_map = ERR_PTR(ret); - goto out; - } - old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock)); rcu_assign_pointer(md->map, (void *)t); md->immutable_target_type = dm_table_get_immutable_target_type(t);