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BD_LINK_DISK_HOLDER(9) The Linux VFS BD_LINK_DISK_HOLDER(9)

NAME

bd_link_disk_holder - create symlinks between holding disk and slave bdev

SYNOPSIS

int bd_link_disk_holder(struct block_device * bdev, struct gendisk * disk);

ARGUMENTS

bdev
the claimed slave bdev

disk

the holding disk

DESCRIPTION

DON'T USE THIS UNLESS YOU'RE ALREADY USING IT.

This functions creates the following sysfs symlinks.

- from “slaves” directory of the holder disk to the claimed bdev - from “holders” directory of the bdev to the holder disk

For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is passed to bd_link_disk_holder, then:

/sys/block/dm-0/slaves/sda --> /sys/block/sda /sys/block/sda/holders/dm-0 --> /sys/block/dm-0

The caller must have claimed bdev before calling this function and ensure that both bdev and disk are valid during the creation and lifetime of these symlinks.

CONTEXT

Might sleep.

RETURN

0 on success, -errno on failure.

COPYRIGHT

April 2019 Kernel Hackers Manual 4.9.