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Restore and expand NONE_MAJOR comment

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This fixes #50.

Change-Id: I318d08e8c57c12cfd409700b14c88a90c81a1715
This commit is contained in:
David van Moolenbroek 2015-08-13 13:40:38 +00:00
parent a6fc634735
commit e9cd054009
1 changed files with 10 additions and 1 deletions
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11
minix/include/minix/dmap.h
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@ -9,7 +9,16 @@
*===========================================================================*/
/* Major device numbers. */
#define NONE_MAJOR 0 /* 0 = not used */
/* Note that NO_DEV is major 0, minor 0, and means "no device". In contrast,
* NONE_MAJOR is used for file systems that do not have backing device (but are
* mounted on device 'none'). For administrative purposes, these file systems
* need to be assigned a pseudo device, and such pseudo devices are allocated
* with major number NONE_MAJOR. Because of NO_DEV, the NONE_MAJOR devices
* start from minor number 1. Otherwise, NONE_MAJOR is completely independent
* from NO_DEV, and it should be possible to set NONE_MAJOR to a nonzero value!
*/
#define NONE_MAJOR 0 /* 0 = pseudo device for 'none' FSes */
#define MEMORY_MAJOR 1 /* 1 = /dev/mem (memory devices) */
#define FLOPPY_MAJOR 2 /* 2 = /dev/fd0 (floppy disks) */
/* 3 = /dev/c0 */