[linux-cifs-client] [PATCH] doc: update mount.cifs man page with nounix option
Suresh Jayaraman
sjayaraman at suse.de
Mon Dec 21 07:38:32 MST 2009
Also add a section on INODE NUMBERS that discusses inode numbers more
thoroughly and add reference to it in "nounix" and "noserverino"
options.
Thanks to Jeff Layton for explaining those details.
Signed-off-by: Suresh Jayaraman <sjayaraman at suse.de>
---
docs-xml/manpages-3/mount.cifs.8.xml | 55 ++++++++++++++++++++++++++++++++-
1 files changed, 53 insertions(+), 2 deletions(-)
diff --git a/docs-xml/manpages-3/mount.cifs.8.xml b/docs-xml/manpages-3/mount.cifs.8.xml
index 372b477..ab389d9 100644
--- a/docs-xml/manpages-3/mount.cifs.8.xml
+++ b/docs-xml/manpages-3/mount.cifs.8.xml
@@ -477,12 +477,36 @@ permissions in memory that can't be stored on the server. This information can d
<varlistentry>
<term>noserverino</term>
- <listitem><para>client generates inode numbers (rather than using the actual one
- from the server) by default.
+ <listitem>
+ <para>
+ Client generates inode numbers (rather than
+ using the actual one from the server) by default.
+ </para>
+ <para>
+ See section <emphasis>INODE NUMBERS</emphasis> for
+ more information.
+ </para>
</para></listitem>
</varlistentry>
<varlistentry>
+ <term>nounix</term>
+ <listitem>
+ <para>
+ Disable the CIFS Unix Extensions for this mount. This
+ can be useful in order to turn off multiple settings at once.
+ This includes POSIX acls, POSIX locks, POSIX paths, symlink
+ support and retrieving uids/gids/mode from the server. This
+ can also be useful to work around a bug in a server that
+ supports Unix Extensions.
+ </para>
+ <para>
+ See section <emphasis>INODE NUMBERS</emphasis> for
+ more information.
+ </para> </listitem>
+ </varlistentry>
+
+ <varlistentry>
<term>nouser_xattr</term>
<listitem><para>(default) Do not allow getfattr/setfattr to get/set xattrs, even if server would support it otherwise. </para></listitem>
</varlistentry>
@@ -533,6 +557,33 @@ permissions in memory that can't be stored on the server. This information can d
</refsect1>
<refsect1>
+ <title>INODE NUMBERS</title>
+ <para>
+ When Unix Extensions are enabled, we use the actual inode
+ number provided by the server in response to the POSIX calls as an
+ inode number.
+ </para>
+ <para>
+ When Unix Extensions are disabled and "serverino" mount option
+ is enabled there is no way to get the server inode number. The
+ client typically maps the server-assigned "UniqueID" onto an inode
+ number.
+ </para>
+ <para>
+ Note that the UniqueID is a different value from the server
+ inode number. The UniqueID value is unique over the scope of the entire
+ server and is often greater than 2 power 32. This value often makes
+ programs that are not compiled with LFS (Large File Support), to
+ trigger a glibc EOVERFLOW error on 32 bit machines as this won't fit
+ in the target structure field. It is strongly recommended to compile
+ your programs with LFS support (i.e. with -D_FILE_OFFSET_BITS=64) to
+ prevent this problem. You can also use "noserverino" mount option to
+ generate inode numbers smaller than 2 power 32 on the client. But you
+ may not be able to detect hardlinks properly.
+ </para>
+</refsect1>
+
+<refsect1>
<title>FILE AND DIRECTORY OWNERSHIP AND PERMISSIONS</title>
<para> The core CIFS protocol does not provide unix ownership
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