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authorMárton Németh <nm127@freemail.hu>2009-02-20 08:12:51 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-02-26 10:45:48 +0100
commit9e8c0bccdc944bd09361672d47660810c027bcaa (patch)
tree2974fec8cbfdddc52d0a051b26dadc7898079d14 /block
parentb2bf96833c5782befc3e7700f791fde754a47b01 (diff)
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>
Diffstat (limited to 'block')
-rw-r--r--block/genhd.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/block/genhd.c b/block/genhd.c
index e1eadcc9546a..a9ec910974c1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -256,6 +256,22 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
}
#endif /* CONFIG_PROC_FS */
+/**
+ * register_blkdev - register a new block device
+ *
+ * @major: the requested major device number [1..255]. If @major=0, try to
+ * allocate any unused major number.
+ * @name: the name of the new block device as a zero terminated string
+ *
+ * The @name must be unique within the system.
+ *
+ * The return value depends on the @major input parameter.
+ * - if a major device number was requested in range [1..255] then the
+ * function returns zero on success, or a negative error code
+ * - if any unused major number was requested with @major=0 parameter
+ * then the return value is the allocated major number in range
+ * [1..255] or a negative error code otherwise
+ */
int register_blkdev(unsigned int major, const char *name)
{
struct blk_major_name **n, *p;