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Diffstat (limited to 'docs/docbook/smbdotconf/locking/level2oplocks.xml')
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diff --git a/docs/docbook/smbdotconf/locking/level2oplocks.xml b/docs/docbook/smbdotconf/locking/level2oplocks.xml new file mode 100644 index 0000000000..c2c090b1a8 --- /dev/null +++ b/docs/docbook/smbdotconf/locking/level2oplocks.xml @@ -0,0 +1,41 @@ +<samba:parameter name="level2 oplocks" + context="S" + xmlns:samba="http://samba.org/common"> +<listitem> + <para>This parameter controls whether Samba supports + level2 (read-only) oplocks on a share.</para> + + <para>Level2, or read-only oplocks allow Windows NT clients + that have an oplock on a file to downgrade from a read-write oplock + to a read-only oplock once a second client opens the file (instead + of releasing all oplocks on a second open, as in traditional, + exclusive oplocks). This allows all openers of the file that + support level2 oplocks to cache the file for read-ahead only (ie. + they may not cache writes or lock requests) and increases performance + for many accesses of files that are not commonly written (such as + application .EXE files).</para> + + <para>Once one of the clients which have a read-only oplock + writes to the file all clients are notified (no reply is needed + or waited for) and told to break their oplocks to "none" and + delete any read-ahead caches.</para> + + <para>It is recommended that this parameter be turned on to + speed access to shared executables.</para> + + <para>For more discussions on level2 oplocks see the CIFS spec.</para> + + <para>Currently, if <link linkend="KERNELOPLOCKS"><parameter moreinfo="none">kernel + oplocks</parameter></link> are supported then level2 oplocks are + not granted (even if this parameter is set to <constant>yes</constant>). + Note also, the <link linkend="OPLOCKS"><parameter moreinfo="none">oplocks</parameter> + </link> parameter must be set to <constant>yes</constant> on this share in order for + this parameter to have any effect.</para> + + <para>See also the <link linkend="OPLOCKS"><parameter moreinfo="none">oplocks</parameter> + </link> and <link linkend="OPLOCKS"><parameter moreinfo="none">kernel oplocks</parameter> + </link> parameters.</para> + + <para>Default: <command moreinfo="none">level2 oplocks = yes</command></para> +</listitem> +</samba:parameter> |