Re: [Libguestfs] [PATCH v3 2/2] New API: btrfs_device_stats

Signed-off-by: Cao jin <caoj.fnst(a)cn.fujitsu.com&gt; --- daemon/btrfs.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++ generator/actions.ml | 10 ++++++++ 2 files changed, 81 insertions(+) diff --git a/daemon/btrfs.c b/daemon/btrfs.c index caa28ca..4288fc9 100644 --- a/daemon/btrfs.c +++ b/daemon/btrfs.c @@ -2083,3 +2083,74 @@ 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 + * [/dev/sdc]... + * ... + */ + + /* 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>." };