Patch Name:  PHKL_10314

Patch Description: s700 10.10 UFS disk space leak when mmap()'ing small files

Creation Date: 97/03/11

Post Date:  97/03/13

Hardware Platforms - OS Releases:
        s700: 10.10

Products: N/A

Filesets:
        OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Release

Critical:
        Yes
        PHKL_10314: OTHER
                UFS file systems could experience disk space leak.

Path Name:  /hp-ux_patches/s700/10.X/PHKL_10314

Symptoms:
        PHKL_10314:
        Disk space leak on UFS file systems; running fsck(1M) on
        a `clean' file system would report inconsistencies such as:
          ...
          ** Phase 1 - Check Blocks and Sizes
          INCORRECT BLOCK COUNT I=386 (4 should be 1)
          ...
          ** Phase 5 - Check Cyl groups
          3 BLK(S) MISSING
          ...
        This would be observed only on UFS file systems with a
        fragment size less than 4KB.

Defect Description:
        PHKL_10314:
        A corner case use of mmap(2) consisting of mapping the first
        few bytes of a small file (less than 3KB)  residing on a UFS
        file system  wrongly  resulted in  increasing  the number of
        fragments allocated to the file.  The file-system disk space
        could  leak, but  running  fsck(1M)  would fix the  problem.
        This problem  would only occur on UFS file  systems  using a
        fragment size less than 4KB.

SR:
        4701347963

Patch Files:
        /usr/conf/lib/libhp-ux.a(ufs_vm.o)

what(1) Output:
        /usr/conf/lib/libhp-ux.a(ufs_vm.o):
                ufs_vm.c      $Date: 97/03/11 16:40:00 $ $Revision:
                        1.3.89.15 $ PATCH_10.10 (PHKL_10314)

cksum(1) Output:
        3932450653 10096 /usr/conf/lib/libhp-ux.a(ufs_vm.o)

Patch Conflicts: None

Patch Dependencies:  None

Hardware Dependencies:  None

Other Dependencies:  None

Supersedes:  None

Equivalent Patches:
        PHKL_10315:
        s800: 10.10

        PHKL_10259:
        s700: 10.20

        PHKL_10260:
        s800: 10.20

Patch Package Size:  60 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_10314

        5a. For a standalone system, run swinstall to install the
            patch:

                swinstall -x autoreboot=true -x match_target=true \
                        -s /tmp/PHKL_10314.depot

        5b. For a homogeneous NFS Diskless cluster run swcluster on the
            server to install the patch on the server and the clients:

                swcluster -i -b

            This will invoke swcluster in the interactive mode and
            force all clients to be shut down.

            WARNING: All cluster clients must be shut down prior to the
                     patch installation.  Installing the patch while the
                     clients are booted is unsupported and can lead to
                     serious problems.

            The swcluster command will invoke an swinstall session in which
            you must specify:

                alternate root path  -  default is /export/shared_root/OS_700
                source depot path    -  /tmp/PHKL_10314.depot

            To complete the installation, select the patch by choosing
            "Actions -> Match What Target Has" and then "Actions -> Install"
            from the Menubar.

        5c. For a heterogeneous NFS Diskless cluster:

                - run swinstall on the server as in step 5a to install
                  the patch on the cluster server.

                - run swcluster on the server as in step 5b to install
                  the patch on the cluster clients.

        By default swinstall will archive the original software in
        /var/adm/sw/patch/PHKL_10314.  If you do not wish to retain a
        copy of the original software, you can create an empty file
        named /var/adm/sw/patch/PATCH_NOSAVE.

        Warning: If this file exists when a patch is installed, the
                 patch cannot be deinstalled.  Please be careful
                 when using this feature.

        It is recommended that you move the PHKL_10314.text file to
        /var/adm/sw/patch for future reference.

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

                dd if=/tmp/PHKL_10314.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:  None