Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
BLKIO
Control Block Contents
BLKIO DSECT
Cross Reference (Contains links to field and bit definitions)
BLKIO Prolog
NAME : HCPBLKIO DESCRIPTION: *BLOCKIO Device Connection Data DSECT : BLKIO FUNCTION : This DSECT maps data representing a successful connection to a device by a virtual machine using the *BLOCKIO system service LOCATED BY : VMDBLKIO field in VMDBK VDEVBIOA field in VDEV CREATED BY : HCPBIO DELETED BY : HCPBIO SERIALIZED : Unique task execution VMDBK dispatch lock.
BLKIO Control Block Content
BLKIO DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure BLKIO *BLOCKIO Device Connection Data 0000 0 Signed 4 BLKNEXT Address of next BLKIO Block 0004 4 Bitstring 1 BLKRC SEVER return code 0005 5 Bitstring 1 BLKSTAT BLKIO status 1... .... BLKSVRD X'80' SEVER is Pending .1.. .... BLKRESET X'40' RESET is Pending 0006 6 Bitstring 2 BLKPATH IUCV path for this device 0008 8 Signed 4 BLKOFFCP CP offset for CMS disk BLKDBCCT is used to indicate the number of outstanding processes in HCPDBC. It is used to indicate that i/o may be in progress for a particular request (by HCPFTUAD). Thus BLKDBCCT and BLKDBIAD both must be 0 for there to be no outstanding *BLOCKIO for this device. 000C 12 Signed 4 BLKDBCCT Count of processes in HCPDBC 0010 16 Signed 4 BLKDBIAD Chain of outstanding DBIRQs 0014 20 Signed 4 BLKDBCWK Chain of outstanding sends to *BLOCKIO 0018 24 Bitstring 16 BLKCPARM (0) User connect parameter list 0018 24 Signed 4 BLKSIZE Block size of user's disk 001C 28 Signed 4 BLKOFFST User's requested offset 0020 32 Signed 2 BLKVDEV Virtual device address 0022 34 Bitstring 6 * Reserved for future IBM use 0028 40 Bitstring 16 BLKPARMA (0) ACCEPT parameter list 0028 40 Signed 4 BLKSTART User's starting block 002C 44 Signed 4 BLKEND User's ending block 0030 48 Bitstring 1 * Reserved for Future IBM Use 0031 49 Bitstring 1 BLKFLAGS Device status flags .... ...1 BLKDEVRD X'01' Virtual device is read only 0032 50 Bitstring 2 * Reserved for Future IBM Use 0034 52 Signed 4 BLKSPIRA Special IRA for SEVER processing 0038 56 Signed 4 BLKVDEVA Virtual device block address 003C 60 Signed 4 BLKDINFO Address of device information 0040 64 Signed 4 BLKSAVBK Caller's save block 0048 72 Dbl-Word 8 * (0) Ensure Double Word Boundary 0048 72 Dbl-Word 8 BLKLOWN (3) BLKIO lock 0060 96 Dbl-Word 8 * (0) Ensure Double Word Boundary 0060 96 Bitstring 40 BLKPARML IUCV parameter list 00000011 BLKDSIZE (*-BLKIO+7)/8 Size, in doublewords, of BLKIO
BLKIO Storage Layout
*** BLKIO - *BLOCKIO Device Connection Data * * +---------------------------+------+------+-------------+ * 0 | BLKNEXT |BLKRC |:STAT | BLKPATH | * +---------------------------+------+------+-------------+ * 8 | BLKOFFCP | BLKDBCCT | * +---------------------------+---------------------------+ * 10 | BLKDBIAD | BLKDBCWK | * +---------------------------+---------------------------+ * 18 | BLKSIZE | BLKOFFST | * +-------------+-------------+---------------------------+ * 20 | BLKVDEV |/////////////////////////////////////////| * +-------------+-------------+---------------------------+ * 28 | BLKSTART | BLKEND | * +------+------+-------------+---------------------------+ * 30 |//////|:FLAGS|/////////////| BLKSPIRA | * +------+------+-------------+---------------------------+ * 38 | BLKVDEVA | BLKDINFO | * +---------------------------+---------------------------+ * 40 | BLKSAVBK |///////////////////////////| * +---------------------------+---------------------------+ * 48 | | * = BLKLOWN = * | | * +-------------------------------------------------------+ * 60 | | * = BLKPARML = * | | * +-------------------------------------------------------+ * 88 * *** BLKIO - *BLOCKIO Device Connection Data
BLKIO Cross Reference
Symbol Dspl Value -------------- ---- ----- BLKCPARM 0018 BLKDBCCT 000C BLKDBCWK 0014 BLKDBIAD 0010 BLKDEVRD 0031 01 BLKDINFO 003C BLKDSIZE 0060 00000011 BLKEND 002C BLKFLAGS 0031 BLKLOWN 0048 BLKNEXT 0000 BLKOFFCP 0008 BLKOFFST 001C BLKPARMA 0028 BLKPARML 0060 BLKPATH 0006 BLKRC 0004 BLKRESET 0005 40 BLKSAVBK 0040 BLKSIZE 0018 BLKSPIRA 0034 BLKSTART 0028 BLKSTAT 0005 BLKSVRD 0005 80 BLKVDEV 0020 BLKVDEVA 0038
Last updated on 5 Jun 2001 at 12:59:50 EDT.
Copyright IBM Corporation, 1990, 2001