new file mode 100644
@@ -0,0 +1,37 @@
+btrfs-dedup(8)
+==============
+
+NAME
+----
+btrfs-dedup - manage in-band (write time) de-duplication of a btrfs filesystem
+
+SYNOPSIS
+--------
+*btrfs dedup* <subcommand> <args>
+
+DESCRIPTION
+-----------
+*btrfs dedup* is used to enable/disable or show current in-band de-duplication
+status of a btrfs filesystem.
+
+WARNING: In-band de-duplication is still a experimental feautre of btrfs,
+use with caution.
+
+SUBCOMMAND
+----------
+Nothing yet
+
+EXIT STATUS
+-----------
+*btrfs dedup* 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),
@@ -74,7 +74,7 @@ cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
cmds-inspect.o cmds-balance.o cmds-send.o cmds-receive.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-property.o cmds-fi-usage.o cmds-dedup.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 \
@@ -208,6 +208,7 @@ 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 },
+ { "dedup", cmd_dedup, NULL, &dedup_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 "dedup.h"
+
+static const char * const dedup_cmd_group_usage[] = {
+ "btrfs dedup <command> [options] <path>",
+ NULL
+};
+
+static const char dedup_cmd_group_info[] =
+"manage inband(write time) de-duplication";
+
+const struct cmd_group dedup_cmd_group = {
+ dedup_cmd_group_usage, dedup_cmd_group_info, {
+ NULL_CMD_STRUCT
+ }
+};
+
+int cmd_dedup(int argc, char **argv)
+{
+ return handle_command_group(&dedup_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 dedup_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_dedup(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);
@@ -476,9 +476,11 @@ struct btrfs_super_block {
#define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
#define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
+#define BTRFS_FEATURE_COMPAT_RO_DEDUP (1ULL << 1)
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
-#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
+#define BTRFS_FEATURE_COMPAT_RO_SUPP \
+ (BTRFS_FEATURE_COMPAT_RO_DEDUP)
#define BTRFS_FEATURE_INCOMPAT_SUPP \
(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
@@ -828,6 +830,23 @@ struct btrfs_csum_item {
u8 csum;
} __attribute__ ((__packed__));
+struct btrfs_dedup_status_item {
+ __le64 blocksize;
+ __le64 limit_nr;
+ __le16 hash_type;
+ __le16 backend;
+} __attribute__ ((__packed__));
+
+struct btrfs_dedup_hash_item {
+ /* on disk length of dedup range */
+ __le64 len;
+
+ /* Spare space */
+ u8 __unused[16];
+
+ /* Hash follows */
+} __attribute__ ((__packed__));
+
/*
* We don't want to overwrite 1M at the beginning of device, even though
* there is our 1st superblock at 64k. Some possible reasons:
@@ -2032,6 +2051,19 @@ static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
return offsetof(struct btrfs_leaf, items);
}
+/* btrfs_dedup_status */
+BTRFS_SETGET_FUNCS(dedup_status_blocksize, struct btrfs_dedup_status_item,
+ blocksize, 64);
+BTRFS_SETGET_FUNCS(dedup_status_limit, struct btrfs_dedup_status_item,
+ limit_nr, 64);
+BTRFS_SETGET_FUNCS(dedup_status_hash_type, struct btrfs_dedup_status_item,
+ hash_type, 16);
+BTRFS_SETGET_FUNCS(dedup_status_backend, struct btrfs_dedup_status_item,
+ backend, 16);
+
+/* btrfs_dedup_hash_item */
+BTRFS_SETGET_FUNCS(dedup_hash_len, struct btrfs_dedup_hash_item, len, 64);
+
/* struct btrfs_file_extent_item */
BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
new file mode 100644
@@ -0,0 +1,39 @@
+/*
+ * 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_DEDUP__
+#define __BTRFS_DEDUP__
+
+/*
+ * 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_DEDUP_BACKEND_INMEMORY 0
+#define BTRFS_DEDUP_BACKEND_ONDISK 1
+#define BTRFS_DEDUP_BACKEND_LAST 2
+
+/* Dedup block size limit and default value */
+#define BTRFS_DEDUP_BLOCKSIZE_MAX (128 * 1024)
+#define BTRFS_DEDUP_BLOCKSIZE_MIN (16 * 1024)
+#define BTRFS_DEDUP_BLOCKSIZE_DEFAULT (32 * 1024)
+
+/* Hash algorithm, only support SHA256 yet */
+#define BTRFS_DEDUP_HASH_SHA256 0
+
+#endif
@@ -466,6 +466,27 @@ 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, re-enable will handle it
+ * TODO: Add support to disable per-file/dir dedup operation
+ */
+#define BTRFS_DEDUP_CTL_ENABLE 1
+#define BTRFS_DEDUP_CTL_DISABLE 2
+#define BTRFS_DEDUP_CTL_STATUS 3
+#define BTRFS_DEDUP_CTL_LAST 4
+struct btrfs_ioctl_dedup_args {
+ __u16 cmd; /* In: command(see above macro) */
+ __u64 blocksize; /* In/Out: For enable/status */
+ __u64 limit_nr; /* In/Out: For enable/status */
+ __u64 current_nr; /* Out: For status output */
+ __u16 backend; /* In/Out: For enable/status */
+ __u16 hash_type; /* In/Out: For enable/status */
+ u8 status; /* Out: For status output */
+ /* pad to 512 bytes */
+ u8 __unused[489];
+};
+
/* 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/btrfs-dedup.asciidoc | 37 +++++++++++++++++++++++++++++ Makefile.in | 2 +- btrfs.c | 1 + cmds-dedup.c | 48 ++++++++++++++++++++++++++++++++++++++ commands.h | 2 ++ ctree.h | 34 ++++++++++++++++++++++++++- dedup.h | 39 +++++++++++++++++++++++++++++++ ioctl.h | 21 +++++++++++++++++ 8 files changed, 182 insertions(+), 2 deletions(-) create mode 100644 Documentation/btrfs-dedup.asciidoc create mode 100644 cmds-dedup.c create mode 100644 dedup.h