From 0783b1a7cbd9a02ddc35fe531b5966b674b304f0 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 1 Jun 2023 11:44:44 +0200 Subject: [PATCH] block: factor out a bd_end_claim helper from blkdev_put Move all the logic to release an exclusive claim into a helper. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Acked-by: Christian Brauner Acked-by: Dave Chinner Reviewed-by: Dave Chinner Link: https://lore.kernel.org/r/20230601094459.1350643-2-hch@lst.de Signed-off-by: Jens Axboe --- block/bdev.c | 63 +++++++++++++++++++++++++++++++----------------------------- 1 file changed, 33 insertions(+), 30 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index 21c63bf..317bfd9 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -589,6 +589,37 @@ void bd_abort_claiming(struct block_device *bdev, void *holder) } EXPORT_SYMBOL(bd_abort_claiming); +static void bd_end_claim(struct block_device *bdev) +{ + struct block_device *whole = bdev_whole(bdev); + bool unblock = false; + + /* + * Release a claim on the device. The holder fields are protected with + * bdev_lock. open_mutex is used to synchronize disk_holder unlinking. + */ + spin_lock(&bdev_lock); + WARN_ON_ONCE(--bdev->bd_holders < 0); + WARN_ON_ONCE(--whole->bd_holders < 0); + if (!bdev->bd_holders) { + bdev->bd_holder = NULL; + if (bdev->bd_write_holder) + unblock = true; + } + if (!whole->bd_holders) + whole->bd_holder = NULL; + spin_unlock(&bdev_lock); + + /* + * If this was the last claim, remove holder link and unblock evpoll if + * it was a write holder. + */ + if (unblock) { + disk_unblock_events(bdev->bd_disk); + bdev->bd_write_holder = false; + } +} + static void blkdev_flush_mapping(struct block_device *bdev) { WARN_ON_ONCE(bdev->bd_holders); @@ -843,36 +874,8 @@ void blkdev_put(struct block_device *bdev, fmode_t mode) sync_blockdev(bdev); mutex_lock(&disk->open_mutex); - if (mode & FMODE_EXCL) { - struct block_device *whole = bdev_whole(bdev); - bool bdev_free; - - /* - * Release a claim on the device. The holder fields - * are protected with bdev_lock. open_mutex is to - * synchronize disk_holder unlinking. - */ - spin_lock(&bdev_lock); - - WARN_ON_ONCE(--bdev->bd_holders < 0); - WARN_ON_ONCE(--whole->bd_holders < 0); - - if ((bdev_free = !bdev->bd_holders)) - bdev->bd_holder = NULL; - if (!whole->bd_holders) - whole->bd_holder = NULL; - - spin_unlock(&bdev_lock); - - /* - * If this was the last claim, remove holder link and - * unblock evpoll if it was a write holder. - */ - if (bdev_free && bdev->bd_write_holder) { - disk_unblock_events(disk); - bdev->bd_write_holder = false; - } - } + if (mode & FMODE_EXCL) + bd_end_claim(bdev); /* * Trigger event checking and tell drivers to flush MEDIA_CHANGE -- 2.7.4