user/sven/linux.git/include/linux/genhd.h, branch v5.13.19

block: prevent block device lookups at the beginning of del_gendisk

2021-05-20T13:59:35Z

As an artifact of how gendisk lookup used to work in earlier kernels, GENHD_FL_UP is only cleared very late in del_gendisk, and a global lock is used to prevent opens from succeeding while del_gendisk is tearing down the gendisk. Switch to clearing the flag early and under bd_mutex so that callers can use bd_mutex to stabilize the flag, which removes the need for the global mutex. Signed-off-by: Christoph Hellwig Reviewed-by: Ming Lei Link: https://lore.kernel.org/r/20210514131842.1600568-2-hch@lst.de Signed-off-by: Jens Axboe

block: remove disk_part_iter

2021-04-08T16:24:36Z

Just open code the xa_for_each in the remaining user. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210406062303.811835-12-hch@lst.de Signed-off-by: Jens Axboe

block: refactor blk_drop_partitions

2021-04-08T16:24:36Z

Move the busy check and disk-wide sync into the only caller, so that the remainder can be shared with del_gendisk. Also pass the gendisk instead of the bdev as that is all that is needed. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210406062303.811835-5-hch@lst.de Signed-off-by: Jens Axboe

block: use an xarray for disk->part_tbl

2021-01-25T01:17:20Z

Now that no fast path lookups in the partition table are left, there is no point in micro-optimizing the data structure for it. Just use a bog standard xarray. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Signed-off-by: Jens Axboe

block: remove DISK_PITER_REVERSE

2021-01-25T01:17:20Z

There is good reason to iterate backwards when deleting all partitions in del_gendisk, just like we don't in blk_drop_partitions. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Signed-off-by: Jens Axboe

block: add a disk_uevent helper

2021-01-25T01:17:20Z

Add a helper to call kobject_uevent for the disk and all partitions, and unexport the disk_part_iter_* helpers that are now only used in the core block code. Signed-off-by: Christoph Hellwig Acked-by: Tejun Heo Signed-off-by: Jens Axboe

block: add a hard-readonly flag to struct gendisk

2021-01-25T01:15:57Z

Commit 20bd1d026aac ("scsi: sd: Keep disk read-only when re-reading partition") addressed a long-standing problem with user read-only policy being overridden as a result of a device-initiated revalidate. The commit has since been reverted due to a regression that left some USB devices read-only indefinitely. To fix the underlying problems with revalidate we need to keep track of hardware state and user policy separately. The gendisk has been updated to reflect the current hardware state set by the device driver. This is done to allow returning the device to the hardware state once the user clears the BLKROSET flag. The resulting semantics are as follows: - If BLKROSET sets a given partition read-only, that partition will remain read-only even if the underlying storage stack initiates a revalidate. However, the BLKRRPART ioctl will cause the partition table to be dropped and any user policy on partitions will be lost. - If BLKROSET has not been set, both the whole disk device and any partitions will reflect the current write-protect state of the underlying device. Based on a patch from Martin K. Petersen . Reported-by: Oleksii Kurochko Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201221 Signed-off-by: Christoph Hellwig Reviewed-by: Ming Lei Reviewed-by: Martin K. Petersen Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe

block: merge struct block_device and struct hd_struct

2020-12-01T21:53:40Z

Instead of having two structures that represent each block device with different life time rules, merge them into a single one. This also greatly simplifies the reference counting rules, as we can use the inode reference count as the main reference count for the new struct block_device, with the device model reference front ending it for device model interaction. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe

block: switch disk_part_iter_* to use a struct block_device

2020-12-01T21:53:40Z

Switch the partition iter infrastructure to iterate over block_device references instead of hd_struct ones mostly used to get at the block_device. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe

block: remove the partno field from struct hd_struct

2020-12-01T21:53:40Z

Just use the bd_partno field in struct block_device everywhere. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe