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nvme: define compat_ioctl again to unbreak 32-bit userspace.

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Commit 89b3d6e605 ("nvme: simplify the compat ioctl handling") removed
the initialization of compat_ioctl from the nvme block_device_operations
structures.

Presumably the expectation was that 32-bit ioctls would be directed
through the regular handler but this is not the case: failing to assign
.compat_ioctl actually means that the compat case is disabled entirely,
and any attempt to submit nvme ioctls from 32-bit userspace fails
outright with -ENOTTY.

For example:

  % smartctl -x /dev/nvme0n1
  [...]
  Read NVMe Identify Controller failed: NVME_IOCTL_ADMIN_CMD: Inappropriate ioctl for device

The blkdev_compat_ptr_ioctl helper can be used to direct compat calls
through the main ioctl handler and makes things work again.

Fixes: 89b3d6e605 ("nvme: simplify the compat ioctl handling")
Signed-off-by: Nick Bowler <nbowler@draconx.ca>
Reviewed-by: Guixin Liu <kanie@linux.alibaba.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Nick Bowler 2022-07-20 23:57:35 -04:00 committed by Jens Axboe
parent eb7e2d9258
commit a25d426158
2 changed files with 2 additions and 0 deletions
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1
drivers/nvme/host/core.c
View file

@ -2136,6 +2136,7 @@ static int nvme_report_zones(struct gendisk *disk, sector_t sector,
static const struct block_device_operations nvme_bdev_ops = {
.owner = THIS_MODULE,
.ioctl = nvme_ioctl,
.compat_ioctl = blkdev_compat_ptr_ioctl,
.open = nvme_open,
.release = nvme_release,
.getgeo = nvme_getgeo,

1
drivers/nvme/host/multipath.c
View file

@ -408,6 +408,7 @@ const struct block_device_operations nvme_ns_head_ops = {
.open = nvme_ns_head_open,
.release = nvme_ns_head_release,
.ioctl = nvme_ns_head_ioctl,
.compat_ioctl = blkdev_compat_ptr_ioctl,
.getgeo = nvme_getgeo,
.report_zones = nvme_ns_head_report_zones,
.pr_ops = &nvme_pr_ops,