Patch Name: PHKL_29115

Patch Description: s700_800 11.11 JFS Direct I/O cumulative patch

Creation Date: 03/06/06

Post Date: 03/08/26

Hardware Platforms - OS Releases:
	s700: 11.11
	s800: 11.11

Products: N/A

Filesets:
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_29115: OTHER
		Performance degradation of direct I/O on any
		unaligned requests.
	PHKL_26552: CORRUPTION

Category Tags:
	defect_repair general_release critical corruption

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_29115

Symptoms:
	PHKL_29115:
	( SR:8606303178 CR:JAGae66534 )
	When using JFS3.3, direct I/O performance may be negatively
	impacted if the read or write requests do not end on a disk
	block boundary (1024 byte boundary).

	PHKL_26552:
	( SR:8606245100 CR:JAGae11577 )
	Data files will be corrupted by NULL characters.  This only
	occurs writing files where the filesystem was mounted using
	the 'direct mount' option of JFS.

Defect Description:
	PHKL_29115:
	( SR:8606303178 CR:JAGae66534 )
	JFS3.3 incorrectly prevents direct I/O from handling any
	requests that do not end on a disk block boundary. This
	results in standard buffered I/O being performed.

	Resolution:
	Modified JFS3.3 routines, so that the end of I/O request is
	no longer checked to see if it is aligned on a disk block
	boundary.

	PHKL_26552:
	( SR:8606245100 CR:JAGae11577 )
	When doing I/O , with multiple uio_iov's in the uio
	structure, data corruption (zeroing of data) will occur.
	The defect occurred because the code in a VxFS read-write
	I/O routine was not keeping track of end-of-file properly.

	Resolution:
	Change code in the VxFS routine to manage end-of-file
	properly.

Enhancement:
	No

SR:
	8606245100 8606303178

Patch Files:
	
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvxfs.a(vx_dio.o)

	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvxfs.a(vx_dio.o)

what(1) Output:
	
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvxfs.a(vx_dio.o):
		vx_dio.c $Date: 2003/05/13 21:39:52 $Revision: r11.1
			1/2 PATCH_11.11 (PHKL_29115)

	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvxfs.a(vx_dio.o):
		vx_dio.c $Date: 2003/05/13 21:39:52 $Revision: r11.1
			1/2 PATCH_11.11 (PHKL_29115)

cksum(1) Output:
	
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	3705074087 9724 /usr/conf/lib/libvxfs.a(vx_dio.o)

	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	1460323388 17216 /usr/conf/lib/libvxfs.a(vx_dio.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_26552 

Equivalent Patches: None

Patch Package Size: 40 KBytes

Installation Instructions:
	Please review all instructions and the Hewlett-Packard
	SupportLine User Guide or your Hewlett-Packard support terms
	and conditions for precautions, scope of license,
	restrictions, and, limitation of liability and warranties,
	before installing this patch.
	------------------------------------------------------------
	1. Back up your system before installing a patch.

	2. Login as root.

	3. Copy the patch to the /tmp directory.

	4. Move to the /tmp directory and unshar the patch:

		cd /tmp
		sh PHKL_29115

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_29115.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_29115.  If you do not wish to retain a
	copy of the original software, include the patch_save_files
	option in the swinstall command above:

		-x patch_save_files=false

	WARNING: If patch_save_files is false when a patch is installed,
		 the patch cannot be deinstalled.  Please be careful
		 when using this feature.

	For future reference, the contents of the PHKL_29115.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_29115.depot

	To put this patch on a magnetic tape and install from the
	tape drive, use the command:

		dd if=/tmp/PHKL_29115.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None