Re: [Libguestfs] [PATCH] New API: btrfs_device_stats

Also modified a public function: analyze_line, make it more flexible

Signed-off-by: Cao jin <caoj.fnst(a)cn.fujitsu.com&gt; --- daemon/btrfs.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++----- generator/actions.ml | 12 ++++++++ 2 files changed, 88 insertions(+), 7 deletions(-) diff --git a/daemon/btrfs.c b/daemon/btrfs.c index 39392f7..f913f66 100644 --- a/daemon/btrfs.c +++ b/daemon/btrfs.c @@ -853,11 +853,11 @@ do_btrfs_fsck (const char *device, int64_t superblock, int repair) * returns the next position following \n. */ static char * -analyze_line (char *line, char **key, char **value) +analyze_line (char *line, char **key, char **value, char delim) { char *p = line; char *next = NULL; - char delimiter = ':'; + char delimiter = delim; char *del_pos = NULL; if (!line || *line == '\0') {

@@ -964,7 +964,7 @@ do_btrfs_subvolume_show (const char *subvolume) * snapshots/test3 * */ - p = analyze_line(out, &key, &value); + p = analyze_line(out, &key, &value, ':'); if (!p) { reply_with_error ("truncated output: %s", out); return NULL; @@ -984,7 +984,7 @@ do_btrfs_subvolume_show (const char *subvolume) } /* Read the lines and split into "key: value". */ - p = analyze_line(p, &key, &value); + p = analyze_line(p, &key, &value, ':'); while (key) { /* snapshot is special, see the output above */ if (STREQLEN (key, "Snapshot(s)", sizeof ("Snapshot(s)") - 1)) { @@ -994,7 +994,7 @@ do_btrfs_subvolume_show (const char *subvolume) if (add_string (&ret, key) == -1) return NULL; - p = analyze_line(p, &key, &value); + p = analyze_line(p, &key, &value, ':'); while (key && !value) { ss = realloc (ss, ss_len + strlen (key) + 1); @@ -1008,7 +1008,7 @@ do_btrfs_subvolume_show (const char *subvolume) ss_len += strlen (key); ss[ss_len] = '\0'; - p = analyze_line(p, &key, &value); + p = analyze_line(p, &key, &value, ':'); } if (ss) { @@ -1031,7 +1031,7 @@ do_btrfs_subvolume_show (const char *subvolume) return NULL; } - p = analyze_line(p, &key, &value); + p = analyze_line(p, &key, &value, ':'); } } @@ -2083,3 +2083,72 @@ do_btrfs_image (char *const *sources, const char *image, return 0; } + +char ** +do_btrfs_device_stats (const char *path, int zero) +{ + 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); + + if ((optargs_bitmask & GUESTFS_BTRFS_DEVICE_STATS_ZERO_BITMASK) && zero) { + ADD_ARG (argv, i, "-z"); + } + + 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 + * + */ + + /* Read the lines and split into "key: value". */ + p = analyze_line(out, &key, &value, ' '); + while(key) + {

+ if (add_string (&ret, key) == -1) + return NULL; + + if (add_string (&ret, value) == -1) + return NULL; + + p = analyze_line(p, &key, &value, ' '); + }

diff --git a/generator/actions.ml b/generator/actions.ml index d5e5ccf..dfb42b5 100644 --- a/generator/actions.ml +++ b/generator/actions.ml @@ -12593,6 +12593,18 @@ 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, 46); + style = RHashtable "devicestats", [Dev_or_Path "path"], [OBool "zero"]; + 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>. + +If you want to reset stats to zero after reading them, use option: zero:true." };