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block: stub out and deprecated the capability attribute on the gendisk 

The capability attribute was added in 2017 to expose the kernel internal
GENHD_FL_MEDIA_CHANGE_NOTIFY to userspace without ever adding a value to
an UAPI header, and without ever setting it in any driver until it was
finally removed in Linux 5.7.

Deprecate the file and always return 0 instead of exposing the other
internal and frequently renumbered other gendisk flags.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230203150209.3199115-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-02-03 16:02:09 +01:00 committed by Jens Axboe
parent 28e538a309
commit e81cd5a983
3 changed files with 2 additions and 14 deletions
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10
Documentation/block/capability.rst
View File

@ -1,10 +0,0 @@
===============================
Generic Block Device Capability
===============================
This file documents the sysfs file ``block/<disk>/capability``.
``capability`` is a bitfield, printed in hexadecimal, indicating which
capabilities a specific block device supports:
.. kernel-doc:: include/linux/blkdev.h

1
Documentation/block/index.rst
View File

@ -10,7 +10,6 @@ Block
bfq-iosched
biovecs
blk-mq
capability
cmdline-partition
data-integrity
deadline-iosched

5
block/genhd.c
View File

@ -1024,9 +1024,8 @@ ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
static ssize_t disk_capability_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
return sprintf(buf, "%x\n", disk->flags);
dev_warn_once(dev, "the capability attribute has been deprecated.\n");
return sprintf(buf, "0\n");
}
static ssize_t disk_alignment_offset_show(struct device *dev,