By doing so we can associate the sequence counter to the chunk_mutex for lockdep purposes (compiled-out otherwise) and also avoid explicitly disabling preemption around the write region as it will now be done automatically by the seqcount machinery based on the lock type.
Signed-off-by: Davidlohr Bueso <dbu...@suse.de> --- fs/btrfs/volumes.c | 2 +- fs/btrfs/volumes.h | 10 ++++------ 2 files changed, 5 insertions(+), 7 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 58b9c419a2b6..b6ee92ddc624 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -431,7 +431,7 @@ static struct btrfs_device *__alloc_device(struct btrfs_fs_info *fs_info) atomic_set(&dev->reada_in_flight, 0); atomic_set(&dev->dev_stats_ccnt, 0); - btrfs_device_data_ordered_init(dev); + btrfs_device_data_ordered_init(dev, fs_info); INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); extent_io_tree_init(fs_info, &dev->alloc_state, diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index bf27ac07d315..ff3ec11bb9d2 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -39,10 +39,10 @@ struct btrfs_io_geometry { #if BITS_PER_LONG==32 && defined(CONFIG_SMP) #include <linux/seqlock.h> #define __BTRFS_NEED_DEVICE_DATA_ORDERED -#define btrfs_device_data_ordered_init(device) \ - seqcount_init(&device->data_seqcount) +#define btrfs_device_data_ordered_init(device, info) \ + seqcount_mutex_init(&device->data_seqcount, &info->chunk_mutex) #else -#define btrfs_device_data_ordered_init(device) do { } while (0) +#define btrfs_device_data_ordered_init(device, info) do { } while (0) #endif #define BTRFS_DEV_STATE_WRITEABLE (0) @@ -71,7 +71,7 @@ struct btrfs_device { blk_status_t last_flush_error; #ifdef __BTRFS_NEED_DEVICE_DATA_ORDERED - seqcount_t data_seqcount; + seqcount_mutex_t data_seqcount; #endif /* the internal btrfs device id */ @@ -162,11 +162,9 @@ btrfs_device_get_##name(const struct btrfs_device *dev) \ static inline void \ btrfs_device_set_##name(struct btrfs_device *dev, u64 size) \ { \ - preempt_disable(); \ write_seqcount_begin(&dev->data_seqcount); \ dev->name = size; \ write_seqcount_end(&dev->data_seqcount); \ - preempt_enable(); \ } #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION) #define BTRFS_DEVICE_GETSET_FUNCS(name) \ -- 2.26.2