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synced 2024-12-14 10:09:48 +00:00
Rewrite minor number decoding. Now we have only three types of
object: subdisks, plexes and volumes. The encoding for plexes and subdisks no longer reflects the object to which they belong. The super devices are high-order volume numbers. This gives vastly more potential volumes (4 million instead of 256).
This commit is contained in:
Greg Lehey
parent
bf7cea1cc0
commit
03c03f6cf4
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=114362
@ -37,15 +37,17 @@
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* otherwise) arising in any way out of the use of this software, even if
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* advised of the possibility of such damage.
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*
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* $Id: vinumvar.h,v 1.27 2001/05/22 04:07:22 grog Exp grog $
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* $Id: vinumvar.h,v 1.32 2003/04/28 02:54:43 grog Exp $
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* $FreeBSD$
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*/
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#include <sys/time.h>
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#include <dev/vinum/vinumstate.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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/* Directory for device nodes. */
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#define VINUM_DIR "/dev/vinum"
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/*
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* Some configuration maxima. They're an enum because
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* we can't define global constants. Sorry about that.
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@ -69,30 +71,47 @@ enum constants {
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ROUND_ROBIN_READPOL = -1, /* round robin read policy */
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/* type field in minor number */
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/*
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* Type field in high-order two bits of minor
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* number. Subdisks are in fact both type 2 and
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* type 3, giving twice the number of subdisks.
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* This causes some ugliness in the code.
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*/
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VINUM_VOLUME_TYPE = 0,
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VINUM_PLEX_TYPE = 1,
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VINUM_SD_TYPE = 2,
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VINUM_DRIVE_TYPE = 3,
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VINUM_SUPERDEV_TYPE = 4, /* super device. */
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VINUM_RAWPLEX_TYPE = 5, /* anonymous plex */
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VINUM_RAWSD_TYPE = 6, /* anonymous subdisk */
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VINUM_SD2_TYPE = 3,
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/* Shifts for the individual fields in the device */
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VINUM_TYPE_SHIFT = 28,
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VINUM_VOL_SHIFT = 0,
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VINUM_PLEX_SHIFT = 16,
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VINUM_SD_SHIFT = 20,
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VINUM_VOL_WIDTH = 8,
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VINUM_PLEX_WIDTH = 3,
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VINUM_SD_WIDTH = 8,
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/*
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* Shifts for the second half of raw plex and
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* subdisk numbers
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*/
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VINUM_RAWPLEX_SHIFT = 8, /* shift the second half this much */
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VINUM_RAWPLEX_WIDTH = 12, /* width of second half */
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/*
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* Define a minor device number.
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* This is not used directly; instead, it's
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* called by the other macros.
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*/
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#define VINUMMINOR(o,t) ((o & 0xff) | ((o & 0x3fff00) << 8) | (t << VINUM_TYPE_SHIFT))
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VINUM_TYPE_SHIFT = 30,
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VINUM_MAXVOL = 0x3ffffd, /* highest numbered volume */
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/*
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* The super device and the daemon device are
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* magic: they're the two highest-numbered
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* volumes.
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*/
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VINUM_SUPERDEV_VOL = 0x3ffffe,
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VINUM_DAEMON_VOL = 0x3fffff,
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VINUM_MAXPLEX = 0x3fffff,
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VINUM_MAXSD = 0x7fffff,
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#define VINUM_SUPERDEV_MINOR VINUMMINOR (VINUM_SUPERDEV_VOL, VINUM_VOLUME_TYPE)
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#define VINUM_DAEMON_MINOR VINUMMINOR (VINUM_DAEMON_VOL, VINUM_VOLUME_TYPE)
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/*
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* Mask for the number part of each object.
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* Plexes and volumes are the same, subdisks use
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* the low-order bit of the type field and thus
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* have twice the number.
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*/
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MAJORDEV_SHIFT = 8,
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@ -105,50 +124,23 @@ enum constants {
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MAXNAME = 64, /* maximum length of any name */
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/*
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* Define a minor device number.
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* This is not used directly; instead, it's
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* called by the other macros.
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*/
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#define VINUMMINOR(v,p,s,t) ( (v << VINUM_VOL_SHIFT) \
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| (p << VINUM_PLEX_SHIFT) \
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| (s << VINUM_SD_SHIFT) \
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| (t << VINUM_TYPE_SHIFT) )
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#define OBJTYPE(x) ((minor(x) >> VINUM_TYPE_SHIFT) & 3)
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/* Create device minor numbers */
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#define VINUMDEV(v,p,s,t) makedev (VINUM_CDEV_MAJOR, VINUMMINOR (v, p, s, t))
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#define VINUM_PLEX(p) makedev (VINUM_CDEV_MAJOR, \
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(VINUM_RAWPLEX_TYPE << VINUM_TYPE_SHIFT) \
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| (p & 0xff) \
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| ((p & ~0xff) << 8) )
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#define VINUM_SD(s) makedev (VINUM_CDEV_MAJOR, \
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(VINUM_RAWSD_TYPE << VINUM_TYPE_SHIFT) \
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| (s & 0xff) \
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| ((s & ~0xff) << 8) )
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/* Create a bit mask for x bits */
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#define MASK(x) ((1 << (x)) - 1)
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/* Create a raw block device minor number */
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#define VINUMRMINOR(d,t) ( ((d & MASK (VINUM_VOL_WIDTH)) << VINUM_VOL_SHIFT) \
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| ((d & ~MASK (VINUM_VOL_WIDTH)) \
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<< (VINUM_PLEX_SHIFT + VINUM_VOL_WIDTH)) \
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| (t << VINUM_TYPE_SHIFT) )
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#define VINUMDEV(o, t) makedev (VINUM_CDEV_MAJOR, VINUMMINOR (o, t))
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#define VINUM_VOL(v) makedev (VINUM_CDEV_MAJOR, \
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VINUMMINOR (v, VINUM_VOLUME_TYPE))
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#define VINUM_PLEX(p) makedev (VINUM_CDEV_MAJOR, \
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VINUMMINOR (p, VINUM_PLEX_TYPE))
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#define VINUM_SD(s) makedev (VINUM_CDEV_MAJOR, \
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VINUMMINOR (s, VINUM_SD_TYPE))
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/* extract device type */
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#define DEVTYPE(x) ((minor (x) >> VINUM_TYPE_SHIFT) & 7)
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#define DEVTYPE(x) ((minor (x) >> VINUM_TYPE_SHIFT) & 3)
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/*
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* This mess is used to catch people who compile
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* a debug vinum(8) and non-debug kernel module,
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* or the other way round.
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*/
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#define VINUM_SUPERDEV VINUMMINOR (1, 0, 0, VINUM_SUPERDEV_TYPE) /* superdevice number */
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#define VINUM_DAEMON_DEV VINUMMINOR (0, 0, 0, VINUM_SUPERDEV_TYPE) /* daemon superdevice number */
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#define VINUM_SUPERDEV_NAME VINUM_DIR"/control" /* normal super device */
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#define VINUM_DAEMON_DEV_NAME VINUM_DIR"/controld" /* super device for daemon only */
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/*
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* the number of object entries to cater for initially, and also the
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@ -172,57 +164,6 @@ enum constants {
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VINUMHOSTNAMELEN = 32, /* host name field in label */
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};
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/* device numbers */
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/*
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* 31 30 28 27 20 19 18 16 15 8 7 0
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* |-----------------------------------------------------------------------------------------------|
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* |X | Type | Subdisk number | X| Plex | Major number | volume number |
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* |-----------------------------------------------------------------------------------------------|
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*
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* 0x2 03 1 19 06
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*
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* The fields in the minor number are interpreted as follows:
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*
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* Volume: Only type and volume number are relevant
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* Plex in volume: type, plex number in volume and volume number are relevant
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* raw plex: type, plex number is made of bits 27-16 and 7-0
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* raw subdisk: type, subdisk number is made of bits 27-16 and 7-0
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*/
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/* This doesn't get used. Consider removing it. */
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struct devcode {
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/*
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* CARE. These fields assume a big-endian word. On a
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* little-endian system, they're the wrong way around
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*/
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unsigned volume:8; /* up to 256 volumes */
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unsigned major:8; /* this is where the major number fits */
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unsigned plex:3; /* up to 8 plexes per volume */
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unsigned unused:1; /* up for grabs */
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unsigned sd:8; /* up to 256 subdisks per plex */
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unsigned type:3; /* type of object */
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/*
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* type field
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VINUM_VOLUME = 0,
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VINUM_PLEX = 1,
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VINUM_SUBDISK = 2,
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VINUM_DRIVE = 3,
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VINUM_SUPERDEV = 4,
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VINUM_RAWPLEX = 5,
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VINUM_RAWSD = 6 */
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unsigned signbit:1; /* to make 32 bits */
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};
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#define VINUM_DIR "/dev/vinum"
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/*
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* These definitions help catch
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* userland/kernel mismatches.
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*/
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#define VINUM_SUPERDEV_NAME VINUM_DIR"/control" /* normal super device */
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#define VINUM_DAEMON_DEV_NAME VINUM_DIR"/controld" /* super device for daemon only */
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/*
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* Slice header
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*
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