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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>
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@ -1,10 +0,0 @@
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===============================
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Generic Block Device Capability
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===============================
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This file documents the sysfs file ``block/<disk>/capability``.
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``capability`` is a bitfield, printed in hexadecimal, indicating which
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capabilities a specific block device supports:
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.. kernel-doc:: include/linux/blkdev.h
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@ -10,7 +10,6 @@ Block
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bfq-iosched
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biovecs
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blk-mq
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capability
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cmdline-partition
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data-integrity
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deadline-iosched
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@ -1024,9 +1024,8 @@ ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
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static ssize_t disk_capability_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct gendisk *disk = dev_to_disk(dev);
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return sprintf(buf, "%x\n", disk->flags);
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dev_warn_once(dev, "the capability attribute has been deprecated.\n");
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return sprintf(buf, "0\n");
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}
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static ssize_t disk_alignment_offset_show(struct device *dev,
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