block: add documentation for register_blkdev()
Add documentation for register_blkdev() function and for the parameters. Signed-off-by: Márton Németh <nm127@freemail.hu> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@ -256,6 +256,22 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
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}
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#endif /* CONFIG_PROC_FS */
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#endif /* CONFIG_PROC_FS */
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/**
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* register_blkdev - register a new block device
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*
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* @major: the requested major device number [1..255]. If @major=0, try to
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* allocate any unused major number.
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* @name: the name of the new block device as a zero terminated string
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*
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* The @name must be unique within the system.
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*
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* The return value depends on the @major input parameter.
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* - if a major device number was requested in range [1..255] then the
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* function returns zero on success, or a negative error code
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* - if any unused major number was requested with @major=0 parameter
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* then the return value is the allocated major number in range
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* [1..255] or a negative error code otherwise
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*/
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int register_blkdev(unsigned int major, const char *name)
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int register_blkdev(unsigned int major, const char *name)
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{
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{
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struct blk_major_name **n, *p;
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struct blk_major_name **n, *p;
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