[Libguestfs] [PATCH v2 2/2] New API: btrfs_device_stats
Signed-off-by: Cao jin <caoj.fnst(a)cn.fujitsu.com>
---
daemon/btrfs.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
generator/actions.ml | 10 ++++++++
2 files changed, 74 insertions(+)
diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index caa28ca..e9b65c3 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -2083,3 +2083,67 @@ do_btrfs_image (char *const *sources, const char *image,
return 0;
}
+char **
+do_btrfs_device_stats (const char *path)
+{
+ const size_t MAX_ARGS = 64;
+ const char *argv[MAX_ARGS];
+ size_t i = 0;
+ CLEANUP_FREE char *buf = NULL;
+ CLEANUP_FREE char *err = NULL;
+ CLEANUP_FREE char *out = NULL;
+ char *p, *key = NULL, *value = NULL;
+ DECLARE_STRINGSBUF (ret);
+ int r;
+ int is_dev;
+
+ is_dev = STREQLEN (path, "/dev/", 5);
+ buf = is_dev ? strdup (path) : sysroot_path (path);
+ if (buf == NULL) {
+ reply_with_perror ("malloc");
+ return NULL;
+ }
+
+ ADD_ARG (argv, i, str_btrfs);
+ ADD_ARG (argv, i, "device");
+ ADD_ARG (argv, i, "stats");
+ ADD_ARG (argv, i, buf);
+ ADD_ARG (argv, i, NULL);
+
+ r = commandv (&out, &err, argv);
+ if (r == -1) {
+ reply_with_error ("%s: %s", path, err);
+ return NULL;
+ }
+
+ /* Output pattern is:
+ * [/dev/sda].write_io_errs 0
+ * [/dev/sda].read_io_errs 0
+ * [/dev/sda].flush_io_errs 0
+ * [/dev/sda].corruption_errs 0
+ * [/dev/sda].generation_errs 0
+ * [/dev/sdb].write_io_errs 0
+ * [/dev/sdb].read_io_errs 0
+ * [/dev/sdb].flush_io_errs 0
+ * [/dev/sdb].corruption_errs 0
+ * [/dev/sdb].generation_errs 0
+ * ...
+ */
+
+ /* Read the lines and split into "key: value". */
+ p = analyze_line(out, &key, &value, ' ');
+ while (key) {
+ if (add_string (&ret, key) == -1)
+ goto error;
+
+ if (add_string (&ret, value) == -1)
+ goto error;
+
+ p = analyze_line(p, &key, &value, ' ');
+ }
+
+ if (end_stringsbuf (&ret) == -1)
+ goto error;
+
+ return ret.argv;
+
+error:
+ if (ret.argv != NULL)
+ free_stringslen (ret.argv, ret.size);
+
+ return NULL;
+}
diff --git a/generator/actions.ml b/generator/actions.ml
index d5e5ccf..8d279fd 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -12593,6 +12593,16 @@ numbered C<partnum> on device C<device>.
It returns C<primary>, C<logical>, or C<extended>." };
+ { defaults with
+ name = "btrfs_device_stats"; added = (1, 29, 47);
+ style = RHashtable "devicestats", [Dev_or_Path "path"], [];
+ proc_nr = Some 456;
+ optional = Some "btrfs"; camel_name = "BTRFSDeviceStats";
+ shortdesc = "read and print the device IO stats for mounted btrfs device";
+ longdesc = "\
+Read and print the device IO stats for all mounted devices of the filesystem
+identified by C<path>, or for a single device identified by C<path>."
};
+
]
(* Non-API meta-commands available only in guestfish.
--
2.1.0