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| author | Christoph Hellwig <hch@lst.de> | 2022-05-27 07:58:06 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 18:44:55 +0200 |
| commit | 4c10e26c35634bf9e9b625e4dd48d21d26c7ed1d (patch) | |
| tree | 46c08e92460b6554f55e927a48f4e35d35d2de80 /include | |
| parent | 9707b276487492d9e1481b9288511e8922990868 (diff) | |
| download | linux-4c10e26c35634bf9e9b625e4dd48d21d26c7ed1d.tar.gz linux-4c10e26c35634bf9e9b625e4dd48d21d26c7ed1d.tar.bz2 linux-4c10e26c35634bf9e9b625e4dd48d21d26c7ed1d.zip | |
block, loop: support partitions without scanning
[ Upstream commit b9684a71fca793213378dd410cd11675d973eaa1 ]
Historically we did distinguish between a flag that surpressed partition
scanning, and a combinations of the minors variable and another flag if
any partitions were supported. This was generally confusing and doesn't
make much sense, but some corner case uses of the loop driver actually
do want to support manually added partitions on a device that does not
actively scan for partitions. To make things worsee the loop driver
also wants to dynamically toggle the scanning for partitions on a live
gendisk, which makes the disk->flags updates non-atomic.
Introduce a new GD_SUPPRESS_PART_SCAN bit in disk->state that disables
just scanning for partitions, and toggle that instead of GENHD_FL_NO_PART
in the loop driver.
Fixes: 1ebe2e5f9d68 ("block: remove GENHD_FL_EXT_DEVT")
Reported-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220527055806.1972352-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blkdev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 60d016138997..108e3d114bfc 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -147,6 +147,7 @@ struct gendisk { #define GD_DEAD 2 #define GD_NATIVE_CAPACITY 3 #define GD_ADDED 4 +#define GD_SUPPRESS_PART_SCAN 5 struct mutex open_mutex; /* open/close mutex */ unsigned open_partitions; /* number of open partitions */ |