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BLKDEV_GET_BY_DEV(9) The Linux VFS BLKDEV_GET_BY_DEV(9)

NAME

blkdev_get_by_dev - open a block device by device number

SYNOPSIS

struct block_device * blkdev_get_by_dev(dev_t dev, fmode_t mode, void * holder);

ARGUMENTS

dev
device number of block device to open
mode
FMODE_* mask
holder
exclusive holder identifier

DESCRIPTION

Open the blockdevice described by device number dev. mode and holder are identical to blkdev_get.
Use it ONLY if you really do not have anything better - i.e. when you are behind a truly sucky interface and all you are given is a device number. _Never_ to be used for internal purposes. If you ever need it - reconsider your API.
On success, the returned block_device has reference count of one.

CONTEXT

Might sleep.

RETURNS

Pointer to block_device on success, ERR_PTR(-errno) on failure.

COPYRIGHT

February 2017 Kernel Hackers Manual 3.16