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Re: [dm-devel] [PATCH v6 1/4] dm-replicator: documentation and module registry



On Thu, 2010-01-07 at 18:18 +0800, 张宇 wrote:
> Is there any command-line example to explain how to use this  patch?

Look at Documentation/device-mapper/replicator.txt and at comments above
replicator_ctr() and _replicator_dev_ctr() in dm-repl.c for mapping
table syntax and examples.

> I have compiled it and loaded the modules, the '<start><length>'
> target parameters in both replicator ant replicator-dev targets means
> what?

replicator doesn't provide a direct mapping of its own, so <length> is
arbitrary and <start> shal be 0.

> how can I construct these target?

See documentation hints above.

> I haven't read the source code in detail till now, sorry. 

You will now ;-)

Regards,
Heinz

> 
> 
> 2009/12/18 <heinzm redhat com>
>         From: Heinz Mauelshagen <heinzm redhat com>
>         
>         The dm-registry module is a general purpose registry for
>         modules.
>         
>         The remote replicator utilizes it to register its ringbuffer
>         log and
>         site link handlers in order to avoid duplicating registry code
>         and logic.
>         
>         
>         Signed-off-by: Heinz Mauelshagen <heinzm redhat com>
>         Reviewed-by: Jon Brassow <jbrassow redhat com>
>         Tested-by: Jon Brassow <jbrassow redhat com>
>         ---
>          Documentation/device-mapper/replicator.txt |  203
>         +++++++++++++++++++++++++
>          drivers/md/Kconfig                         |    8 +
>          drivers/md/Makefile                        |    1 +
>          drivers/md/dm-registry.c                   |  224
>         ++++++++++++++++++++++++++++
>          drivers/md/dm-registry.h                   |   38 +++++
>          5 files changed, 474 insertions(+), 0 deletions(-)
>          create mode 100644 Documentation/device-mapper/replicator.txt
>          create mode 100644 drivers/md/dm-registry.c
>          create mode 100644 drivers/md/dm-registry.h
>         
>         diff --git
>         2.6.33-rc1.orig/Documentation/device-mapper/replicator.txt
>         2.6.33-rc1/Documentation/device-mapper/replicator.txt
>         new file mode 100644
>         index 0000000..1d408a6
>         --- /dev/null
>         +++ 2.6.33-rc1/Documentation/device-mapper/replicator.txt
>         @@ -0,0 +1,203 @@
>         +dm-replicator
>         +=============
>         +
>         +Device-mapper replicator is designed to enable redundant
>         copies of
>         +storage devices to be made - preferentially, to remote
>         locations.
>         +RAID1 (aka mirroring) is often used to maintain redundant
>         copies of
>         +storage for fault tolerance purposes.  Unlike RAID1, which
>         often
>         +assumes similar device characteristics, dm-replicator is
>         designed to
>         +handle devices with different latency and bandwidth
>         characteristics
>         +which are often the result of the geograhic disparity of
>         multi-site
>         +architectures.  Simply put, you might choose RAID1 to protect
>         from
>         +a single device failure, but you would choose remote
>         replication
>         +via dm-replicator for protection against a site failure.
>         +
>         +dm-replicator works by first sending write requests to the
>         "replicator
>         +log".  Not to be confused with the device-mapper dirty log,
>         this
>         +replicator log behaves similarly to that of a journal.  Write
>         requests
>         +go to this log first and then are copied to all the replicate
>         devices
>         +at their various locations.  Requests are cleared from the
>         log once all
>         +replicate devices confirm the data is received/copied.  This
>         architecture
>         +allows dm-replicator to be flexible in terms of device
>         characteristics.
>         +If one device should fall behind the others - perhaps due to
>         high latency -
>         +the slack is picked up by the log.  The user has a great deal
>         of
>         +flexibility in specifying to what degree a particular site is
>         allowed to
>         +fall behind - if at all.
>         +
>         +Device-Mapper's dm-replicator has two targets, "replicator"
>         and
>         +"replicator-dev".  The "replicator" target is used to setup
>         the
>         +aforementioned log and allow the specification of site link
>         properties.
>         +Through the "replicator" target, the user might specify that
>         writes
>         +that are copied to the local site must happen synchronously
>         (i.e the
>         +writes are complete only after they have passed through the
>         log device
>         +and have landed on the local site's disk).  They may also
>         specify that
>         +a remote link should asynchronously complete writes, but that
>         the remote
>         +link should never fall more than 100MB behind in terms of
>         processing.
>         +Again, the "replicator" target is used to define the
>         replicator log and
>         +the characteristics of each site link.
>         +
>         +The "replicator-dev" target is used to define the devices
>         used and
>         +associate them with a particular replicator log.  You might
>         think of
>         +this stage in a similar way to setting up RAID1 (mirroring).
>          You
>         +define a set of devices which will be copies of each other,
>         but
>         +access the device through the mirror virtual device which
>         takes care
>         +of the copying.  The user accessible replicator device is
>         analogous
>         +to the mirror virtual device, while the set of devices being
>         copied
>         +to are analogous to the mirror images (sometimes called
>         'legs').
>         +When creating a replicator device via the "replicator-dev"
>         target,
>         +it must be associated with the replicator log (created with
>         the
>         +aforementioned "replicator" target).  When each redundant
>         device
>         +is specified as part of the replicator device, it is
>         associated with
>         +a site link whose properties were defined when the
>         "replicator"
>         +target was created.
>         +
>         +The user can go farther than simply replicating one device.
>          They
>         +can continue to add replicator devices - associating them
>         with a
>         +particular replicator log.  Writes that go through the
>         replicator
>         +log are guarenteed to have their write ordering preserved.
>          So, if
>         +you associate more than one replicator device to a particular
>         +replicator log, you are preserving write ordering across
>         multiple
>         +devices.  This might be useful if you had a database that
>         spanned
>         +multiple disks and write ordering must be preserved or any
>         transaction
>         +accounting scheme would be foiled.  (You can imagine this
>         like
>         +preserving write ordering across a number of mirrored
>         devices, where
>         +each mirror has images/legs in different geographic
>         locations.)
>         +
>         +dm-replicator has a modular architecture.  Future
>         implementations for
>         +the replicator log and site link modules are allowed.  The
>         current
>         +replication log is ringbuffer - utilized to store all writes
>         being
>         +subject to replication and enforce write ordering.  The
>         current site
>         +link code is based on accessing block devices (iSCSI, FC,
>         etc) and
>         +does device recovery including (initial) resynchronization.
>         +
>         +
>         +Picture of a 2 site configuration with 3 local devices (LDs)
>         in a
>         +primary site being resycnhronied to 3 remotes sites with 3
>         remote
>         +devices (RDs) each via site links (SLINK) 1-2 with site link
>         0
>         +as a special case to handle the local devices:
>         +
>         +                                           |
>         +    Local (primary) site                   |      Remote
>         sites
>         +    --------------------                   |
>          ------------
>         +                                           |
>         +    D1   D2     Dn                         |
>         +     |   |       |                         |
>         +     +---+- ... -+                         |
>         +         |                                 |
>         +       REPLOG-----------------+- SLINK1 ------------+
>         +         |                    |            |        |
>         +       SLINK0 (special case)  |            |        |
>         +         |                    |            |        |
>         +     +-----+   ...  +         |            |   +----+- ... -+
>         +     |     |        |         |            |   |    |       |
>         +    LD1   LD2      LDn        |            |  RD1  RD2
>         RDn
>         +                              |            |
>         +                              +-- SLINK2------------+
>         +                              |            |        |
>         +                              |            |   +----+- ... -+
>         +                              |            |   |    |       |
>         +                              |            |  RD1  RD2
>         RDn
>         +                              |            |
>         +                              |            |
>         +                              |            |
>         +                              +- SLINKm ------------+
>         +                                           |        |
>         +                                           |   +----+- ... -+
>         +                                           |   |    |       |
>         +                                           |  RD1  RD2
>         RDn
>         +
>         +
>         +
>         +
>         +The following are descriptions of the device-mapper tables
>         used to
>         +construct the "replicator" and "replicator-dev" targets.
>         +
>         +"replicator" target parameters:
>         +-------------------------------
>         +<start> <length> replicator \
>         +       <replog_type> <#replog_params> <replog_params> \
>         +       [<slink_type_0> <#slink_params_0>
>         <slink_params_0>]{1..N}
>         +
>         +<replog_type>    = "ringbuffer" is currently the only
>         available type
>         +<#replog_params> = # of args following this one intended for
>         the replog (2 or 4)
>         +<replog_params>  = <dev_path> <dev_start> [auto/create/open
>         <size>]
>         +       <dev_path>  = device path of replication log (REPLOG)
>         backing store
>         +       <dev_start> = offset to REPLOG header
>         +       create      = The replication log will be initialized
>         if not active
>         +                     and sized to "size".  (If already
>         active, the create
>         +                     will fail.)  Size is always in sectors.
>         +       open        = The replication log must be initialized
>         and valid or
>         +                     the constructor will fail.
>         +       auto        = If a valid replication log header is
>         found on the
>         +                     replication device, this will behave
>         like 'open'.
>         +                     Otherwise, this option behaves like
>         'create'.
>         +
>         +<slink_type>    = "blockdev" is currently the only available
>         type
>         +<#slink_params> = 1/2/4
>         +<slink_params>  = <slink_nr> [<slink_policy> [<fall_behind>
>         <N>]]
>         +       <slink_nr>     = This is a unique number that is used
>         to identify a
>         +                        particular site/location.  '0' is
>         always used to
>         +                        identify the local site, while
>         increasing integers
>         +                        are used to identify remote sites.
>         +       <slink_policy> = The policy can be either 'sync' or
>         'async'.
>         +                        'sync' means write requests will not
>         return until
>         +                        the data is on the storage device.
>          'async' allows
>         +                        a device to "fall behind"; that is,
>         outstanding
>         +                        write requests are waiting in the
>         replication log
>         +                        to be processed for this site, but it
>         is not delaying
>         +                        the writes of other sites.
>         +       <fall_behind>  = This field is used to specify how far
>         the user is
>         +                        willing to allow write requests to
>         this specific site
>         +                        to "fall behind" in processing before
>         switching to
>         +                        a 'sync' policy.  This "fall behind"
>         threshhold can
>         +                        be specified in three ways: ios,
>         size, or timeout.
>         +                        'ios' is the number of pending I/Os
>         allowed (e.g.
>         +                        "ios 10000").  'size' is the amount
>         of pending data
>         +                        allowed (e.g. "size 200m").  Size
>         labels include:
>         +                        s (sectors), k, m, g, t, p, and e.
>          'timeout' is
>         +                        the amount of time allowed for writes
>         to be
>         +                        outstanding.  Time labels include: s,
>         m, h, and d.
>         +
>         +
>         +"replicator-dev" target parameters:
>         +-----------------------------------
>         +start> <length> replicator-dev
>         +       <replicator_device> <dev_nr> \
>         +       [<slink_nr> <#dev_params> <dev_params>
>         +        <dlog_type> <#dlog_params> <dlog_params>]{1..N}
>         +
>         +<replicator_device> = device previously constructed via
>         "replication" target
>         +<dev_nr>           = An integer that is used to 'tag' write
>         requests as
>         +                     belonging to a particular set of devices
>         - specifically,
>         +                     the devices that follow this argument
>         (i.e. the site
>         +                     link devices).
>         +<slink_nr>         = This number identifies the site/location
>         where the next
>         +                     device to be specified comes from.  It
>         is exactly the
>         +                     same number used to identify the
>         site/location (and its
>         +                     policies) in the "replicator" target.
>          Interestingly,
>         +                     while one might normally expect a
>         "dev_type" argument
>         +                     here, it can be deduced from the site
>         link number and
>         +                     the 'slink_type' given in the
>         "replication" target.
>         +<#dev_params>      = '1'  (The number of allowed parameters
>         actually depends
>         +                     on the 'slink_type' given in the
>         "replication" target.
>         +                     Since our only option there is
>         "blockdev", the only
>         +                     allowable number here is currently '1'.)
>         +<dev_params>       = 'dev_path'  (Again, since "blockdev" is
>         the only
>         +                     'slink_type' available, the only
>         allowable argument here
>         +                     is the path to the device.)
>         +<dlog_type>        = Not to be confused with the "replicator
>         log", this is
>         +                     the type of dirty log associated with
>         this particular
>         +                     device.  Dirty logs are used for
>         synchronization, during
>         +                     initialization or fall behind
>         conditions, to bring devices
>         +                     into a coherent state with its peers -
>         analogous to
>         +                     rebuilding a RAID1 (mirror) device.
>          Available dirty
>         +                     log types include: 'nolog', 'core', and
>         'disk'
>         +<#dlog_params>     = The number of arguments required for a
>         particular log
>         +                     type - 'nolog' = 0, 'core' = 1/2, 'disk'
>         = 2/3.
>         +<dlog_params>      = 'nolog' => ~no arguments~
>         +                     'core'  => <region_size> [sync | nosync]
>         +                     'disk'  => <dlog_dev_path> <region_size>
>         [sync | nosync]
>         +       <region_size>   = This sets the granularity at which
>         the dirty log
>         +                         tracks what areas of the device is
>         in-sync.
>         +       [sync | nosync] = Optionally specify whether the sync
>         should be forced
>         +                         or avoided initially.
>         diff --git 2.6.33-rc1.orig/drivers/md/Kconfig
>         2.6.33-rc1/drivers/md/Kconfig
>         index acb3a4e..62c9766 100644
>         --- 2.6.33-rc1.orig/drivers/md/Kconfig
>         +++ 2.6.33-rc1/drivers/md/Kconfig
>         @@ -313,6 +313,14 @@ config DM_DELAY
>         
>                If unsure, say N.
>         
>         +config DM_REPLICATOR
>         +       tristate "Replication target (EXPERIMENTAL)"
>         +       depends on BLK_DEV_DM && EXPERIMENTAL
>         +       ---help---
>         +       A target that supports replication of local devices to
>         remote sites.
>         +
>         +       If unsure, say N.
>         +
>          config DM_UEVENT
>                bool "DM uevents (EXPERIMENTAL)"
>                depends on BLK_DEV_DM && EXPERIMENTAL
>         diff --git 2.6.33-rc1.orig/drivers/md/Makefile
>         2.6.33-rc1/drivers/md/Makefile
>         index e355e7f..be05b39 100644
>         --- 2.6.33-rc1.orig/drivers/md/Makefile
>         +++ 2.6.33-rc1/drivers/md/Makefile
>         @@ -44,6 +44,7 @@ obj-$(CONFIG_DM_SNAPSHOT)     +=
>         dm-snapshot.o
>          obj-$(CONFIG_DM_MIRROR)                += dm-mirror.o
>         dm-log.o dm-region-hash.o
>          obj-$(CONFIG_DM_LOG_USERSPACE) += dm-log-userspace.o
>          obj-$(CONFIG_DM_ZERO)          += dm-zero.o
>         +obj-$(CONFIG_DM_REPLICATOR)    += dm-log.o dm-registry.o
>         
>          quiet_cmd_unroll = UNROLL  $@
>               cmd_unroll = $(AWK) -f$(srctree)/$(src)/unroll.awk -vN=
>         $(UNROLL) \
>         diff --git 2.6.33-rc1.orig/drivers/md/dm-registry.c
>         2.6.33-rc1/drivers/md/dm-registry.c
>         new file mode 100644
>         index 0000000..fb8abbf
>         --- /dev/null
>         +++ 2.6.33-rc1/drivers/md/dm-registry.c
>         @@ -0,0 +1,224 @@
>         +/*
>         + * Copyright (C) 2009 Red Hat, Inc. All rights reserved.
>         + *
>         + * Module Author: Heinz Mauelshagen (heinzm redhat com)
>         + *
>         + * Generic registry for arbitrary structures
>         + * (needs dm_registry_type structure upfront each registered
>         structure).
>         + *
>         + * This file is released under the GPL.
>         + *
>         + * FIXME: use as registry for e.g. dirty log types as well.
>         + */
>         +
>         +#include <linux/init.h>
>         +#include <linux/module.h>
>         +#include <linux/moduleparam.h>
>         +
>         +#include "dm-registry.h"
>         +
>         +#define        DM_MSG_PREFIX   "dm-registry"
>         +
>         +static const char *version = "0.001";
>         +
>         +/* Sizable class registry. */
>         +static unsigned num_classes;
>         +static struct list_head *_classes;
>         +static rwlock_t *_locks;
>         +
>         +void *
>         +dm_get_type(const char *type_name, enum dm_registry_class
>         class)
>         +{
>         +       struct dm_registry_type *t;
>         +
>         +       read_lock(_locks + class);
>         +       list_for_each_entry(t, _classes + class, list) {
>         +               if (!strcmp(type_name, t->name)) {
>         +                       if (!t->use_count && !
>         try_module_get(t->module)) {
>         +                               read_unlock(_locks + class);
>         +                               return ERR_PTR(-ENOMEM);
>         +                       }
>         +
>         +                       t->use_count++;
>         +                       read_unlock(_locks + class);
>         +                       return t;
>         +               }
>         +       }
>         +
>         +       read_unlock(_locks + class);
>         +       return ERR_PTR(-ENOENT);
>         +}
>         +EXPORT_SYMBOL(dm_get_type);
>         +
>         +void
>         +dm_put_type(void *type, enum dm_registry_class class)
>         +{
>         +       struct dm_registry_type *t = type;
>         +
>         +       read_lock(_locks + class);
>         +       if (!--t->use_count)
>         +               module_put(t->module);
>         +
>         +       read_unlock(_locks + class);
>         +}
>         +EXPORT_SYMBOL(dm_put_type);
>         +
>         +/* Add a type to the registry. */
>         +int
>         +dm_register_type(void *type, enum dm_registry_class class)
>         +{
>         +       struct dm_registry_type *t = type, *tt;
>         +
>         +       if (unlikely(class >= num_classes))
>         +               return -EINVAL;
>         +
>         +       tt = dm_get_type(t->name, class);
>         +       if (unlikely(!IS_ERR(tt))) {
>         +               dm_put_type(t, class);
>         +               return -EEXIST;
>         +       }
>         +
>         +       write_lock(_locks + class);
>         +       t->use_count = 0;
>         +       list_add(&t->list, _classes + class);
>         +       write_unlock(_locks + class);
>         +
>         +       return 0;
>         +}
>         +EXPORT_SYMBOL(dm_register_type);
>         +
>         +/* Remove a type from the registry. */
>         +int
>         +dm_unregister_type(void *type, enum dm_registry_class class)
>         +{
>         +       struct dm_registry_type *t = type;
>         +
>         +       if (unlikely(class >= num_classes)) {
>         +               DMERR("Attempt to unregister invalid class");
>         +               return -EINVAL;
>         +       }
>         +
>         +       write_lock(_locks + class);
>         +
>         +       if (unlikely(t->use_count)) {
>         +               write_unlock(_locks + class);
>         +               DMWARN("Attempt to unregister a type that is
>         still in use");
>         +               return -ETXTBSY;
>         +       } else
>         +               list_del(&t->list);
>         +
>         +       write_unlock(_locks + class);
>         +       return 0;
>         +}
>         +EXPORT_SYMBOL(dm_unregister_type);
>         +
>         +/*
>         + * Return kmalloc'ed NULL terminated pointer
>         + * array of all type names of the given class.
>         + *
>         + * Caller has to kfree the array!.
>         + */
>         +const char **dm_types_list(enum dm_registry_class class)
>         +{
>         +       unsigned i = 0, count = 0;
>         +       const char **r;
>         +       struct dm_registry_type *t;
>         +
>         +       /* First count the registered types in the class. */
>         +       read_lock(_locks + class);
>         +       list_for_each_entry(t, _classes + class, list)
>         +               count++;
>         +       read_unlock(_locks + class);
>         +
>         +       /* None registered in this class. */
>         +       if (!count)
>         +               return NULL;
>         +
>         +       /* One member more for array NULL termination. */
>         +       r = kzalloc((count + 1) * sizeof(*r), GFP_KERNEL);
>         +       if (!r)
>         +               return ERR_PTR(-ENOMEM);
>         +
>         +       /*
>         +        * Go with the counted ones.
>         +        * Any new added ones after we counted will be
>         ignored!
>         +        */
>         +       read_lock(_locks + class);
>         +       list_for_each_entry(t, _classes + class, list) {
>         +               r[i++] = t->name;
>         +               if (!--count)
>         +                       break;
>         +       }
>         +       read_unlock(_locks + class);
>         +
>         +       return r;
>         +}
>         +EXPORT_SYMBOL(dm_types_list);
>         +
>         +int __init
>         +dm_registry_init(void)
>         +{
>         +       unsigned n;
>         +
>         +       BUG_ON(_classes);
>         +       BUG_ON(_locks);
>         +
>         +       /* Module parameter given ? */
>         +       if (!num_classes)
>         +               num_classes = DM_REGISTRY_CLASS_END;
>         +
>         +       n = num_classes;
>         +       _classes = kmalloc(n * sizeof(*_classes), GFP_KERNEL);
>         +       if (!_classes) {
>         +               DMERR("Failed to allocate classes registry");
>         +               return -ENOMEM;
>         +       }
>         +
>         +       _locks = kmalloc(n * sizeof(*_locks), GFP_KERNEL);
>         +       if (!_locks) {
>         +               DMERR("Failed to allocate classes locks");
>         +               kfree(_classes);
>         +               _classes = NULL;
>         +               return -ENOMEM;
>         +       }
>         +
>         +       while (n--) {
>         +               INIT_LIST_HEAD(_classes + n);
>         +               rwlock_init(_locks + n);
>         +       }
>         +
>         +       DMINFO("initialized %s for max %u classes", version,
>         num_classes);
>         +       return 0;
>         +}
>         +
>         +void __exit
>         +dm_registry_exit(void)
>         +{
>         +       BUG_ON(!_classes);
>         +       BUG_ON(!_locks);
>         +
>         +       kfree(_classes);
>         +       _classes = NULL;
>         +       kfree(_locks);
>         +       _locks = NULL;
>         +       DMINFO("exit %s", version);
>         +}
>         +
>         +/* Module hooks */
>         +module_init(dm_registry_init);
>         +module_exit(dm_registry_exit);
>         +module_param(num_classes, uint, 0);
>         +MODULE_PARM_DESC(num_classes, "Maximum number of classes");
>         +MODULE_DESCRIPTION(DM_NAME "device-mapper registry");
>         +MODULE_AUTHOR("Heinz Mauelshagen <heinzm redhat com>");
>         +MODULE_LICENSE("GPL");
>         +
>         +#ifndef MODULE
>         +static int __init num_classes_setup(char *str)
>         +{
>         +       num_classes = simple_strtol(str, NULL, 0);
>         +       return num_classes ? 1 : 0;
>         +}
>         +
>         +__setup("num_classes=", num_classes_setup);
>         +#endif
>         diff --git 2.6.33-rc1.orig/drivers/md/dm-registry.h
>         2.6.33-rc1/drivers/md/dm-registry.h
>         new file mode 100644
>         index 0000000..1cb0ce8
>         --- /dev/null
>         +++ 2.6.33-rc1/drivers/md/dm-registry.h
>         @@ -0,0 +1,38 @@
>         +/*
>         + * Copyright (C) 2009 Red Hat, Inc. All rights reserved.
>         + *
>         + * Module Author: Heinz Mauelshagen (heinzm redhat com)
>         + *
>         + * Generic registry for arbitrary structures.
>         + * (needs dm_registry_type structure upfront each registered
>         structure).
>         + *
>         + * This file is released under the GPL.
>         + */
>         +
>         +#include "dm.h"
>         +
>         +#ifndef DM_REGISTRY_H
>         +#define DM_REGISTRY_H
>         +
>         +enum dm_registry_class {
>         +       DM_REPLOG = 0,
>         +       DM_SLINK,
>         +       DM_LOG,
>         +       DM_REGION_HASH,
>         +       DM_REGISTRY_CLASS_END,
>         +};
>         +
>         +struct dm_registry_type {
>         +       struct list_head list;  /* Linked list of types in
>         this class. */
>         +       const char *name;
>         +       struct module *module;
>         +       unsigned int use_count;
>         +};
>         +
>         +void *dm_get_type(const char *type_name, enum
>         dm_registry_class class);
>         +void dm_put_type(void *type, enum dm_registry_class class);
>         +int dm_register_type(void *type, enum dm_registry_class
>         class);
>         +int dm_unregister_type(void *type, enum dm_registry_class
>         class);
>         +const char **dm_types_list(enum dm_registry_class class);
>         +
>         +#endif
>         --
>         1.6.2.5
>         
>         --
>         dm-devel mailing list
>         dm-devel redhat com
>         https://www.redhat.com/mailman/listinfo/dm-devel
> 
> --
> dm-devel mailing list
> dm-devel redhat com
> https://www.redhat.com/mailman/listinfo/dm-devel


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