This aims to add deduplication subcommand, 'btrfs dedup command path',
ie. register/unregister'.
It can be used to enable or disable dedup support for a filesystem.
Signed-off-by: Liu Bo bo.li@oracle.com
---
v2: add manpage
Makefile |2 +-
btrfs.c|1 +
cmds-dedup.c | 101
commands.h |2 +
ctree.h|2 +
ioctl.h|5 +++
man/btrfs.8.in | 12 +++
7 files changed, 124 insertions(+), 1 deletions(-)
create mode 100644 cmds-dedup.c
diff --git a/Makefile b/Makefile
index da7438e..5b4a07d 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ objects = ctree.o disk-io.o radix-tree.o extent-tree.o
print-tree.o \
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-restore.o cmds-dedup.o
libbtrfs_objects = send-stream.o send-utils.o rbtree.o btrfs-list.o crc32c.o
libbtrfs_headers = send-stream.h send-utils.h send.h rbtree.h btrfs-list.h \
crc32c.h list.h kerncompat.h radix-tree.h extent-cache.h \
diff --git a/btrfs.c b/btrfs.c
index 691adef..956905c 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -254,6 +254,7 @@ const struct cmd_group btrfs_cmd_group = {
{ quota, cmd_quota, NULL, quota_cmd_group, 0 },
{ qgroup, cmd_qgroup, NULL, qgroup_cmd_group, 0 },
{ replace, cmd_replace, NULL, replace_cmd_group, 0 },
+ { dedup, cmd_dedup, NULL, dedup_cmd_group, 0 },
{ help, cmd_help, cmd_help_usage, NULL, 0 },
{ version, cmd_version, cmd_version_usage, NULL, 0 },
{ 0, 0, 0, 0, 0 }
diff --git a/cmds-dedup.c b/cmds-dedup.c
new file mode 100644
index 000..a977585
--- /dev/null
+++ b/cmds-dedup.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2013 Oracle. 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 sys/ioctl.h
+#include unistd.h
+
+#include ctree.h
+#include ioctl.h
+
+#include commands.h
+#include utils.h
+
+static const char * const dedup_cmd_group_usage[] = {
+ btrfs dedup command [options] path,
+ NULL
+};
+
+int dedup_ctl(int cmd, int argc, char **argv)
+{
+ int ret = 0;
+ int fd;
+ int e;
+ char *path = argv[1];
+
+ if (check_argc_exact(argc, 2))
+ return -1;
+
+ fd = open_file_or_dir(path);
+ if (fd 0) {
+ fprintf(stderr, ERROR: can't access '%s'\n, path);
+ return -EACCES;
+ }
+
+ ret = ioctl(fd, BTRFS_IOC_DEDUP_CTL, cmd);
+ e = errno;
+ close(fd);
+ if (ret 0) {
+ fprintf(stderr, ERROR: dedup command failed: %s\n,
+ strerror(e));
+ if (cmd == BTRFS_DEDUP_CTL_UNREG)
+ fprintf(stderr, please refer to 'dmesg | tail' for
more info\n);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static const char * const cmd_dedup_reg_usage[] = {
+ btrfs dedup register path,
+ Enable data deduplication support for a filesystem.,
+ NULL
+};
+
+static int cmd_dedup_reg(int argc, char **argv)
+{
+ int ret = dedup_ctl(BTRFS_DEDUP_CTL_REG, argc, argv);
+ if (ret 0)
+ usage(cmd_dedup_reg_usage);
+ return ret;
+}
+
+static const char * const cmd_dedup_unreg_usage[] = {
+ btrfs dedup unregister path,
+ Disable data deduplication support for a filesystem.,
+ NULL
+};
+
+static int cmd_dedup_unreg(int argc, char **argv)
+{
+ int ret = dedup_ctl(BTRFS_DEDUP_CTL_UNREG, argc, argv);
+ if (ret 0)
+ usage(cmd_dedup_unreg_usage);
+ return ret;
+}
+
+const struct cmd_group dedup_cmd_group = {
+ dedup_cmd_group_usage, NULL, {
+ { register, cmd_dedup_reg, cmd_dedup_reg_usage, NULL, 0 },
+ { unregister, cmd_dedup_unreg, cmd_dedup_unreg_usage, 0, 0 },
+ { 0, 0, 0, 0, 0 }
+ }
+};
+
+int cmd_dedup(int argc, char **argv)
+{
+ return handle_command_group(dedup_cmd_group, argc, argv);
+}
diff --git a/commands.h b/commands.h
index 15c616d..d31afa4 100644
--- a/commands.h
+++ b/commands.h
@@
