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block: RCU protect disk->conv_zones_bitmap

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Ensure that a disk revalidation changing the conventional zones bitmap
of a disk does not cause invalid memory references when using the
disk_zone_is_conv() helper by RCU protecting the disk->conv_zones_bitmap
pointer.

disk_zone_is_conv() is modified to operate under the RCU read lock and
the function disk_set_conv_zones_bitmap() is added to update a disk
conv_zones_bitmap pointer using rcu_replace_pointer() with the disk
zone_wplugs_lock spinlock held.

disk_free_zone_resources() is modified to call
disk_update_zone_resources() with a NULL bitmap pointer to free the disk
conv_zones_bitmap. disk_set_conv_zones_bitmap() is also used in
disk_update_zone_resources() to set the new (revalidated) bitmap and
free the old one.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20241107064300.227731-2-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal
2024-11-07 15:42:59 +09:00
committed by Jens Axboe
parent 8e71afb94d
commit d7cb6d7414
2 changed files with 32 additions and 13 deletions
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2
include/linux/blkdev.h
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@@ -195,7 +195,7 @@ struct gendisk {
unsigned int nr_zones;
unsigned int zone_capacity;
unsigned int last_zone_capacity;
unsigned long *conv_zones_bitmap;
unsigned long __rcu *conv_zones_bitmap;
unsigned int zone_wplugs_hash_bits;
spinlock_t zone_wplugs_lock;
struct mempool_s *zone_wplugs_pool;