Add status subcommand for dedup command group.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
Documentation/btrfs-dedup.asciidoc | 3 ++
cmds-dedup.c | 72 ++++++++++++++++++++++++++++++++++++++
2 files changed, 75 insertions(+)
diff --git a/Documentation/btrfs-dedup.asciidoc
b/Documentation/btrfs-dedup.asciidoc
index 08d1050..8b605fb 100644
--- a/Documentation/btrfs-dedup.asciidoc
+++ b/Documentation/btrfs-dedup.asciidoc
@@ -54,6 +54,9 @@ If *LIMIT* is zero, there will be no limit at all. Use with
caution as it can
use up all the memory for dedup hash.
Default value is 4096 if using 'inmemory' backend.
+*status* <path>::
+Show current in-band de-duplication status of a filesystem.
+
BACKENDS
--------
Btrfs in-band de-duplication support two different backends with their own
diff --git a/cmds-dedup.c b/cmds-dedup.c
index f15c2c2..5792420 100644
--- a/cmds-dedup.c
+++ b/cmds-dedup.c
@@ -195,11 +195,83 @@ out:
return 0;
}
+static const char * const cmd_dedup_status_usage[] = {
+ "btrfs dedup status <path>",
+ "Show current in-band(write time) de-duplication status of a btrfs.",
+ NULL
+};
+
+static int cmd_dedup_status(int argc, char **argv)
+{
+ struct btrfs_ioctl_dedup_args dargs;
+ DIR *dirstream;
+ char *path;
+ int fd;
+ int ret;
+ int print_limit = 1;
+
+ if (check_argc_exact(argc, 2))
+ usage(cmd_dedup_status_usage);
+
+ path = argv[1];
+ fd = open_file_or_dir(path, &dirstream);
+ if (fd < 0) {
+ error("failed to open file or directory: %s", path);
+ ret = 1;
+ goto out;
+ }
+ memset(&dargs, 0, sizeof(dargs));
+ dargs.cmd = BTRFS_DEDUP_CTL_STATUS;
+
+ ret = ioctl(fd, BTRFS_IOC_DEDUP_CTL, &dargs);
+ if (ret < 0) {
+ error("failed to get inband deduplication status: %s",
+ strerror(errno));
+ ret = 1;
+ goto out;
+ }
+ ret = 0;
+ if (dargs.status == 0) {
+ printf("Status: Disabled\n");
+ goto out;
+ }
+ printf("Status: Enabled\n");
+
+ if (dargs.hash_type == BTRFS_DEDUP_HASH_SHA256)
+ printf("Hash algorithm: SHA-256\n");
+ else
+ printf("Hash algorithm: Unrecognized(%x)\n",
+ dargs.hash_type);
+
+ if (dargs.backend == BTRFS_DEDUP_BACKEND_INMEMORY) {
+ printf("Backend: In-memory\n");
+ print_limit = 1;
+ } else if (dargs.backend == BTRFS_DEDUP_BACKEND_ONDISK) {
+ printf("Backend: On-disk\n");
+ print_limit = 0;
+ } else {
+ printf("Backend: Unrecognized(%x)\n",
+ dargs.backend);
+ }
+
+ printf("Dedup Blocksize: %llu\n", dargs.blocksize);
+
+ if (print_limit) {
+ printf("Current number of hash: %llu\n", dargs.current_nr);
+ printf("Max number of hash: %llu\n", dargs.limit_nr);
+ }
+out:
+ close_file_or_dir(fd, dirstream);
+ return ret;
+}
+
const struct cmd_group dedup_cmd_group = {
dedup_cmd_group_usage, dedup_cmd_group_info, {
{ "enable", cmd_dedup_enable, cmd_dedup_enable_usage, NULL, 0},
{ "disable", cmd_dedup_disable, cmd_dedup_disable_usage,
NULL, 0},
+ { "status", cmd_dedup_status, cmd_dedup_status_usage,
+ NULL, 0},
NULL_CMD_STRUCT
}
};
--
2.6.4
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