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Cao jin

2015-Jun-17 08:44 UTC

[Libguestfs] [PATCH v2 1/2] Modify public function: analyze_line, make it more flexible

Mofify the function from fixed dilemiter to variabler. So,
it could be used in more APIs later. Also modified the existed caller

Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
---
 daemon/btrfs.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index 39392f7..caa28ca 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -853,11 +853,10 @@ 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 delimiter)
 {
   char *p = line;
   char *next = NULL;
-  char delimiter = ':';
   char *del_pos = NULL;
 
   if (!line || *line == '\0') {
@@ -964,7 +963,7 @@ 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 +983,7 @@ 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 +993,7 @@ 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 +1007,7 @@ 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 +1030,7 @@ do_btrfs_subvolume_show (const char *subvolume)
           return NULL;
       }
 
-      p = analyze_line(p, &key, &value);
+      p = analyze_line(p, &key, &value, ':');
     }
   }
 
@@ -2083,3 +2082,4 @@ do_btrfs_image (char *const *sources, const char *image,
 
   return 0;
 }
+
-- 
2.1.0

Cao jin

2015-Jun-17 08:44 UTC

head link

[Libguestfs] [PATCH v2 2/2] New API: btrfs_device_stats

Signed-off-by: Cao jin <caoj.fnst@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

Pino Toscano

2015-Jun-17 11:15 UTC

head link

Re: [Libguestfs] [PATCH v2 1/2] Modify public function: analyze_line, make it more flexible

On Wednesday 17 June 2015 16:44:07 Cao jin wrote:> Mofify the function from fixed dilemiter to variabler. So,
> it could be used in more APIs later. Also modified the existed caller
Not to sound too overly pedantic on English (especially that I'm not
a native speaker myself), but this needs to be slightly improved:

  Modify the function from a fixed delimiter to a variable. So,
  it can be used in more APIs later. Also modified the existing
  callers.

Also, it is not a public function, just an internal one.
> 
> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
> ---
>  daemon/btrfs.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/daemon/btrfs.c b/daemon/btrfs.c
> index 39392f7..caa28ca 100644
> --- a/daemon/btrfs.c
> +++ b/daemon/btrfs.c
> @@ -853,11 +853,10 @@ 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 delimiter)
>  {
>    char *p = line;
>    char *next = NULL;
> -  char delimiter = ':';
>    char *del_pos = NULL;
>  
>    if (!line || *line == '\0') {
> @@ -964,7 +963,7 @@ 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 +983,7 @@ 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 +993,7 @@ 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 +1007,7 @@ 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 +1030,7 @@ do_btrfs_subvolume_show (const char *subvolume)
>            return NULL;
>        }
>  
> -      p = analyze_line(p, &key, &value);
> +      p = analyze_line(p, &key, &value, ':');
>      }
>    }
>  
> @@ -2083,3 +2082,4 @@ do_btrfs_image (char *const *sources, const char
*image,
>  
>    return 0;
>  }
> +
> 
The actual changes LGTM.

Thanks,
-- 
Pino Toscano

Cao jin

2015-Jun-18 02:03 UTC

head link

Re: [Libguestfs] [PATCH v2 1/2] Modify public function: analyze_line, make it more flexible

Hi Pino

在 2015年06月17日 19:15, Pino Toscano 写道:> On Wednesday 17 June 2015 16:44:07 Cao jin wrote:
>> Mofify the function from fixed dilemiter to variabler. So,
>> it could be used in more APIs later. Also modified the existed caller
>
> Not to sound too overly pedantic on English (especially that I'm not
> a native speaker myself), but this needs to be slightly improved:
>
Sorry for making you have that feeling, didn`t mean to make it sound 
that way. Because I am not native English speaker too, and also poor 
vocabulary, so maybe sometimes, when I want to describe something 
clearly, wish make it easier to be understood, lots of redundant or 
exaggerated words or some words like that are used, but actually I did 
not realized:(
>    Modify the function from a fixed delimiter to a variable. So,
>    it can be used in more APIs later. Also modified the existing
>    callers.
>
Yes, your improvement is better.
> Also, it is not a public function, just an internal one.
>
Yup, it is static, not public over the project, my original meaning is, 
it is "public" within btrfs.c, maybe other btrfs APIs will use it
later.
sorry for my bad description:)
>>
>> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
>> ---
>>   daemon/btrfs.c | 14 +++++++-------
>>   1 file changed, 7 insertions(+), 7 deletions(-)
>>
>> diff --git a/daemon/btrfs.c b/daemon/btrfs.c
>> index 39392f7..caa28ca 100644
>> --- a/daemon/btrfs.c
>> +++ b/daemon/btrfs.c
>> @@ -853,11 +853,10 @@ 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 delimiter)
>>   {
>>     char *p = line;
>>     char *next = NULL;
>> -  char delimiter = ':';
>>     char *del_pos = NULL;
>>
>>     if (!line || *line == '\0') {
>> @@ -964,7 +963,7 @@ 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 +983,7 @@ 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 +993,7 @@ 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 +1007,7 @@ 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 +1030,7 @@ do_btrfs_subvolume_show (const char *subvolume)
>>             return NULL;
>>         }
>>
>> -      p = analyze_line(p, &key, &value);
>> +      p = analyze_line(p, &key, &value, ':');
>>       }
>>     }
>>
>> @@ -2083,3 +2082,4 @@ do_btrfs_image (char *const *sources, const char
*image,
>>
>>     return 0;
>>   }
>> +
>>
>
> The actual changes LGTM.
>
> Thanks,
>
-- 
Yours Sincerely,

Cao Jin

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