@@ -28,6 +28,7 @@ MAN8_TXT += btrfs-qgroup.asciidoc
MAN8_TXT += btrfs-replace.asciidoc
MAN8_TXT += btrfs-restore.asciidoc
MAN8_TXT += btrfs-property.asciidoc
+MAN8_TXT += btrfs-dedupe-inband.asciidoc
# Category 5 manual page
MAN5_TXT += btrfs-man5.asciidoc
new file mode 100644
@@ -0,0 +1,40 @@
+btrfs-dedupe(8)
+==============
+
+NAME
+----
+btrfs-dedupe-inband - manage in-band (write time) de-duplication of a btrfs
+filesystem
+
+SYNOPSIS
+--------
+*btrfs dedupe-inband* <subcommand> <args>
+
+DESCRIPTION
+-----------
+*btrfs dedupe-inband* is used to enable/disable or show current in-band de-duplication
+status of a btrfs filesystem.
+
+Kernel support for in-band de-duplication starts from 4.8.
+
+WARNING: In-band de-duplication is still an experimental feautre of btrfs,
+use with caution.
+
+SUBCOMMAND
+----------
+Nothing yet
+
+EXIT STATUS
+-----------
+*btrfs dedupe-inband* returns a zero exit status if it succeeds. Non zero is
+returned in case of failure.
+
+AVAILABILITY
+------------
+*btrfs* is part of btrfs-progs.
+Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
+further details.
+
+SEE ALSO
+--------
+`mkfs.btrfs`(8),
@@ -43,6 +43,10 @@ COMMANDS
Do off-line check on a btrfs filesystem. +
See `btrfs-check`(8) for details.
+*dedupe*::
+ Control btrfs in-band(write time) de-duplication. +
+ See `btrfs-dedupe`(8) for details.
+
*device*::
Manage devices managed by btrfs, including add/delete/scan and so
on. +
@@ -86,7 +86,8 @@ cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
cmds-quota.o cmds-qgroup.o cmds-replace.o cmds-check.o \
cmds-restore.o cmds-rescue.o chunk-recover.o super-recover.o \
cmds-property.o cmds-fi-usage.o cmds-inspect-dump-tree.o \
- cmds-inspect-dump-super.o cmds-inspect-tree-stats.o cmds-fi-du.o
+ cmds-inspect-dump-super.o cmds-inspect-tree-stats.o cmds-fi-du.o \
+ cmds-dedupe-ib.o
libbtrfs_objects = send-stream.o send-utils.o rbtree.o btrfs-list.o crc32c.o \
uuid-tree.o utils-lib.o rbtree-utils.o
libbtrfs_headers = send-stream.h send-utils.h send.h rbtree.h btrfs-list.h \
@@ -199,6 +199,8 @@ static const struct cmd_group btrfs_cmd_group = {
{ "receive", cmd_receive, cmd_receive_usage, NULL, 0 },
{ "quota", cmd_quota, NULL, "a_cmd_group, 0 },
{ "qgroup", cmd_qgroup, NULL, &qgroup_cmd_group, 0 },
+ { "dedupe-inband", cmd_dedupe_ib, NULL, &dedupe_ib_cmd_group,
+ 0 },
{ "replace", cmd_replace, NULL, &replace_cmd_group, 0 },
{ "help", cmd_help, cmd_help_usage, NULL, 0 },
{ "version", cmd_version, cmd_version_usage, NULL, 0 },
new file mode 100644
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2015 Fujitsu. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <getopt.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#include "ctree.h"
+#include "ioctl.h"
+
+#include "commands.h"
+#include "utils.h"
+#include "kerncompat.h"
+#include "dedupe-ib.h"
+
+static const char * const dedupe_ib_cmd_group_usage[] = {
+ "btrfs dedupe-inband <command> [options] <path>",
+ NULL
+};
+
+static const char dedupe_ib_cmd_group_info[] =
+"manage inband(write time) de-duplication";
+
+const struct cmd_group dedupe_ib_cmd_group = {
+ dedupe_ib_cmd_group_usage, dedupe_ib_cmd_group_info, {
+ NULL_CMD_STRUCT
+ }
+};
+
+int cmd_dedupe_ib(int argc, char **argv)
+{
+ return handle_command_group(&dedupe_ib_cmd_group, argc, argv);
+}
@@ -93,6 +93,7 @@ extern const struct cmd_group inspect_cmd_group;
extern const struct cmd_group property_cmd_group;
extern const struct cmd_group quota_cmd_group;
extern const struct cmd_group qgroup_cmd_group;
+extern const struct cmd_group dedupe_ib_cmd_group;
extern const struct cmd_group replace_cmd_group;
extern const struct cmd_group rescue_cmd_group;
@@ -118,6 +119,7 @@ int cmd_send(int argc, char **argv);
int cmd_receive(int argc, char **argv);
int cmd_quota(int argc, char **argv);
int cmd_qgroup(int argc, char **argv);
+int cmd_dedupe_ib(int argc, char **argv);
int cmd_replace(int argc, char **argv);
int cmd_restore(int argc, char **argv);
int cmd_select_super(int argc, char **argv);
new file mode 100644
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2015 Fujitsu. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __BTRFS_DEDUPE__
+#define __BTRFS_DEDUPE__
+
+/*
+ * Dedup storage backend
+ * On disk is persist storage but overhead is large
+ * In memory is fast but will lose all its hash on umount
+ */
+#define BTRFS_DEDUPE_BACKEND_INMEMORY 0
+#define BTRFS_DEDUPE_BACKEND_LAST 1
+
+/* Dedup block size limit and default value */
+#define BTRFS_DEDUPE_BLOCKSIZE_MAX (8 * 1024 * 1024)
+#define BTRFS_DEDUPE_BLOCKSIZE_MIN (16 * 1024)
+#define BTRFS_DEDUPE_BLOCKSIZE_DEFAULT (128 * 1024)
+
+/* Default dedupe limit on number of hash */
+#define BTRFS_DEDUPE_LIMIT_NR_DEFAULT (32 * 1024)
+
+/* Hash algorithm, only support SHA256 yet */
+#define BTRFS_DEDUPE_HASH_SHA256 0
+
+#endif
@@ -503,6 +503,41 @@ struct btrfs_ioctl_get_dev_stats {
__u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
};
+/*
+ * de-duplication control modes
+ * For re-config, enable will handle it
+ */
+#define BTRFS_DEDUPE_CTL_ENABLE 1
+#define BTRFS_DEDUPE_CTL_DISABLE 2
+#define BTRFS_DEDUPE_CTL_STATUS 3
+#define BTRFS_DEDUPE_CTL_RECONF 4
+#define BTRFS_DEDUPE_CTL_LAST 5
+
+/*
+ * Allow enable command to be executed on dedupe enabled fs.
+ * Make dedupe_enable ioctl to be stateless.
+ *
+ * Or only dedup_reconf ioctl can be executed on dedupe enabled fs
+ */
+#define BTRFS_DEDUPE_FLAG_FORCE (1 << 0)
+/*
+ * This structure is used for dedupe enable/disable/configure
+ * and status ioctl.
+ * Reserved range should be set to 0xff.
+ */
+struct btrfs_ioctl_dedupe_args {
+ __u16 cmd; /* In: command */
+ __u64 blocksize; /* In/Out: blocksize */
+ __u64 limit_nr; /* In/Out: limit nr for inmem backend */
+ __u64 limit_mem; /* In/Out: limit mem for inmem backend */
+ __u64 current_nr; /* Out: current hash nr */
+ __u16 backend; /* In/Out: current backend */
+ __u16 hash_algo; /* In/Out: hash algorithm */
+ u8 status; /* Out: enabled or disabled */
+ u8 flags; /* In: special flags for ioctl */
+ u8 __unused[472]; /* Pad to 512 bytes */
+};
+
/* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
#define BTRFS_QUOTA_CTL_ENABLE 1
#define BTRFS_QUOTA_CTL_DISABLE 2
Add basic ioctl header and command group framework for later use. Alone with basic man page doc. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> --- Documentation/Makefile.in | 1 + Documentation/btrfs-dedupe-inband.asciidoc | 40 +++++++++++++++++++++++++ Documentation/btrfs.asciidoc | 4 +++ Makefile.in | 3 +- btrfs.c | 2 ++ cmds-dedupe-ib.c | 48 ++++++++++++++++++++++++++++++ commands.h | 2 ++ dedupe-ib.h | 41 +++++++++++++++++++++++++ ioctl.h | 35 ++++++++++++++++++++++ 9 files changed, 175 insertions(+), 1 deletion(-) create mode 100644 Documentation/btrfs-dedupe-inband.asciidoc create mode 100644 cmds-dedupe-ib.c create mode 100644 dedupe-ib.h