From 9d1c92872e7082f100f629a58b32fa0214aa1aec Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 8 Jun 2023 13:02:29 +0200 Subject: block: also call ->open for incremental partition opens For whole devices ->open is called for each open, but for partitions it is only called on the first open of a partition, e.g.: open("/dev/vdb", ...) open("/dev/vdb", ...) - 2 call to ->open open("/dev/vdb1", ...) open("/dev/vdb", ...) - 2 call to ->open open("/dev/vdb", ...) open("/dev/vdb", ...) - just open call to ->open This is problematic as various block drivers look at open flags and might not do all the required setup if the earlier open was with an odd flag like O_NDELAY or the magic 3 ioctl-only open mode. Signed-off-by: Christoph Hellwig Reviewed-by: Phillip Potter Reviewed-by: Hannes Reinecke Acked-by: Christian Brauner Link: https://lore.kernel.org/r/20230608110258.189493-2-hch@lst.de Signed-off-by: Jens Axboe --- block/bdev.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index 5c46ff107706..981f61357951 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -683,9 +683,6 @@ static int blkdev_get_part(struct block_device *part, fmode_t mode) struct gendisk *disk = part->bd_disk; int ret; - if (atomic_read(&part->bd_openers)) - goto done; - ret = blkdev_get_whole(bdev_whole(part), mode); if (ret) return ret; @@ -694,9 +691,10 @@ static int blkdev_get_part(struct block_device *part, fmode_t mode) if (!bdev_nr_sectors(part)) goto out_blkdev_put; - disk->open_partitions++; - set_init_blocksize(part); -done: + if (!atomic_read(&part->bd_openers)) { + disk->open_partitions++; + set_init_blocksize(part); + } atomic_inc(&part->bd_openers); return 0; @@ -709,10 +707,10 @@ static void blkdev_put_part(struct block_device *part, fmode_t mode) { struct block_device *whole = bdev_whole(part); - if (!atomic_dec_and_test(&part->bd_openers)) - return; - blkdev_flush_mapping(part); - whole->bd_disk->open_partitions--; + if (atomic_dec_and_test(&part->bd_openers)) { + blkdev_flush_mapping(part); + whole->bd_disk->open_partitions--; + } blkdev_put_whole(whole, mode); } -- cgit v1.2.3