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rbd: update comment heading

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Properly document the configuration string syntax and semantics.  Remove
(out of date) details about the librbd implementation.

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Sage Weil 2011-09-15 14:11:10 -07:00 committed by Kevin Wolf
parent f9fe18ec77
commit 9e1fbcde57
1 changed files with 13 additions and 15 deletions
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28
block/rbd.c
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@ -13,35 +13,33 @@
#include "qemu-common.h"
#include "qemu-error.h"
#include "block_int.h"
#include <rbd/librbd.h>
/*
* When specifying the image filename use:
*
* rbd:poolname/devicename[@snapshotname][:option1=value1[:option2=value2...]]
*
* poolname must be the name of an existing rados pool
* poolname must be the name of an existing rados pool.
*
* devicename is the basename for all objects used to
* emulate the raw device.
* devicename is the name of the rbd image.
*
* Each option given is used to configure rados, and may be
* any Ceph option, or "conf". The "conf" option specifies
* a Ceph configuration file to read.
* Each option given is used to configure rados, and may be any valid
* Ceph option, "id", or "conf".
*
* Metadata information (image size, ...) is stored in an
* object with the name "devicename.rbd".
* The "id" option indicates what user we should authenticate as to
* the Ceph cluster. If it is excluded we will use the Ceph default
* (normally 'admin').
*
* The raw device is split into 4MB sized objects by default.
* The sequencenumber is encoded in a 12 byte long hex-string,
* and is attached to the devicename, separated by a dot.
* e.g. "devicename.1234567890ab"
* The "conf" option specifies a Ceph configuration file to read. If
* it is not specified, we will read from the default Ceph locations
* (e.g., /etc/ceph/ceph.conf). To avoid reading _any_ configuration
* file, specify conf=/dev/null.
*
* Configuration values containing :, @, or = can be escaped with a
* leading "\".
*/
#define OBJ_MAX_SIZE (1UL << OBJ_DEFAULT_OBJ_ORDER)