[Libguestfs] [PATCH v4 1/2] New API: btrfs_balance_status
Chen Hanxiao
chenhanxiao at cn.fujitsu.com
Fri Feb 13 10:06:54 UTC 2015
From: Hu Tao <hutao at cn.fujitsu.com>
Signed-off-by: Hu Tao <hutao at cn.fujitsu.com>
Signed-off-by: Chen Hanxiao <chenhanxiao at cn.fujitsu.com>
---
daemon/btrfs.c | 126 +++++++++++++++++++++++++++++++
generator/actions.ml | 10 +++
generator/structs.ml | 12 +++
gobject/Makefile.inc | 2 +
java/Makefile.inc | 1 +
java/com/redhat/et/libguestfs/.gitignore | 1 +
po/POTFILES | 1 +
src/MAX_PROC_NR | 2 +-
8 files changed, 154 insertions(+), 1 deletion(-)
diff --git a/daemon/btrfs.c b/daemon/btrfs.c
index 5cab52a..a979327 100644
--- a/daemon/btrfs.c
+++ b/daemon/btrfs.c
@@ -1659,3 +1659,129 @@ do_btrfs_rescue_super_recover (const char *device)
return 0;
}
+
+guestfs_int_btrfsbalance *
+do_btrfs_balance_status (const char *path)
+{
+ const size_t MAX_ARGS = 64;
+ const char *argv[MAX_ARGS];
+ size_t i = 0;
+ CLEANUP_FREE char *path_buf = NULL;
+ CLEANUP_FREE char *err = NULL;
+ char *out;
+ int r;
+ guestfs_int_btrfsbalance *ret;
+ char **lines;
+ size_t nlines;
+ const char *errptr;
+ int erroffset;
+#define N_MATCH 2
+ int ovector[N_MATCH * 3];
+ pcre *re = NULL;
+
+ path_buf = sysroot_path (path);
+ if (path_buf == NULL) {
+ reply_with_perror ("malloc");
+ return NULL;
+ }
+
+ ADD_ARG (argv, i, str_btrfs);
+ ADD_ARG (argv, i, "balance");
+ ADD_ARG (argv, i, "status");
+ ADD_ARG (argv, i, path_buf);
+ ADD_ARG (argv, i, NULL);
+
+ r = commandv (&out, &err, argv);
+ if (r == -1) {
+ reply_with_error ("%s: %s", path, err);
+ return NULL;
+ }
+
+ lines = split_lines (out);
+ if (!lines)
+ return NULL;
+
+ nlines = count_strings (lines);
+
+ ret = malloc(sizeof *ret);
+ if (ret == NULL) {
+ reply_with_perror ("malloc");
+ goto error;
+ }
+ memset (ret, 0, sizeof(*ret));
+
+ /* Output of `btrfs balance status' is like:
+ *
+ * running:
+ *
+ * Balance on '/' is running
+ * 3 out of about 8 chunks balanced (3 considered), 62% left
+ *
+ * paused:
+ *
+ * Balance on '/' is paused
+ * 3 out of about 8 chunks balanced (3 considered), 62% left
+ *
+ * no balance running:
+ *
+ * No Balance found on '/'
+ *
+ */
+ if (nlines < 1) {
+ reply_with_perror ("No balance status output");
+ return NULL;
+ }
+
+ if (strstr (lines[0], "No balance found on")) {
+ ret->btrfsbalance_status = strdup("none");
+ if (ret->btrfsbalance_status == NULL) {
+ reply_with_perror ("strdup");
+ return NULL;
+ }
+ return ret;
+ }
+
+ re = pcre_compile ("Balance on '.*' is (.*)", 0, &errptr, &erroffset, NULL);
+ if (re == NULL) {
+ reply_with_error ("pcre_compile (%i): %s", erroffset, errptr);
+ goto error;
+ }
+ if (pcre_exec (re, NULL, lines[0], strlen (lines[0]), 0, 0,
+ ovector, N_MATCH * 3) < 0) {
+ reply_with_error ("unexpected output from 'btrfs balance status' command: %s", lines[0]);
+ goto error;
+ }
+#undef N_MATCH
+
+ if (STREQ (lines[0] + ovector[2], "running"))
+ ret->btrfsbalance_status = strdup("running");
+ else if (STREQ (lines[0] + ovector[2], "paused"))
+ ret->btrfsbalance_status = strdup("paused");
+ else {
+ reply_with_error ("unexpected output from 'btrfs balance status' command: %s", lines[0]);
+ goto error;
+ }
+
+ if (nlines < 2) {
+ reply_with_error ("truncated output from 'btrfs balance status' command");
+ goto error;
+ }
+
+ if (sscanf (lines[1], "%" SCNu64 " out of about %" SCNu64
+ " chunks balanced (%" SCNu64 " considered), %" SCNu64 "%% left",
+ &ret->btrfsbalance_balanced, &ret->btrfsbalance_total,
+ &ret->btrfsbalance_considered, &ret->btrfsbalance_left) != 4) {
+ reply_with_perror ("sscanf");
+ goto error;
+ }
+
+ pcre_free (re);
+ return ret;
+
+error:
+ free (ret->btrfsbalance_status);
+ free (ret);
+ pcre_free (re);
+
+ return NULL;
+}
diff --git a/generator/actions.ml b/generator/actions.ml
index 6b37712..5301a29 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -12449,6 +12449,16 @@ valid GUID." };
longdesc = "\
Return the GUID of numbered GPT partition C<partnum>." };
+{ defaults with
+ name = "btrfs_balance_status";
+ style = RStruct ("status", "btrfsbalance"), [Pathname "path"], [];
+ proc_nr = Some 448;
+ optional = Some "btrfs"; camel_name = "BTRFSBalanceStatus";
+ test_excuse = "test disk isn't large enough that btrfs_balance completes before we can get its status";
+ shortdesc = "show the status of a running or paused balance";
+ longdesc = "\
+Show the status of a running or paused balance on a btrfs filesystem." };
+
]
(* Non-API meta-commands available only in guestfish.
diff --git a/generator/structs.ml b/generator/structs.ml
index 5b466a2..af42529 100644
--- a/generator/structs.ml
+++ b/generator/structs.ml
@@ -340,6 +340,18 @@ let structs = [
];
s_camel_name = "BTRFSQgroup" };
+ (* btrfs balance status output *)
+ { defaults with
+ s_name = "btrfsbalance";
+ s_cols = [
+ "btrfsbalance_status", FString;
+ "btrfsbalance_total", FUInt64;
+ "btrfsbalance_balanced", FUInt64;
+ "btrfsbalance_considered", FUInt64;
+ "btrfsbalance_left", FUInt64;
+ ];
+ s_camel_name = "BTRFSBalance" };
+
(* XFS info descriptor. *)
{ defaults with
s_name = "xfsinfo";
diff --git a/gobject/Makefile.inc b/gobject/Makefile.inc
index e0c0a5f..3ce10f9 100644
--- a/gobject/Makefile.inc
+++ b/gobject/Makefile.inc
@@ -25,6 +25,7 @@ guestfs_gobject_headers= \
include/guestfs-gobject/tristate.h \
include/guestfs-gobject/struct-application.h \
include/guestfs-gobject/struct-application2.h \
+ include/guestfs-gobject/struct-btrfsbalance.h \
include/guestfs-gobject/struct-btrfsqgroup.h \
include/guestfs-gobject/struct-btrfssubvolume.h \
include/guestfs-gobject/struct-dirent.h \
@@ -108,6 +109,7 @@ guestfs_gobject_sources= \
src/tristate.c \
src/struct-application.c \
src/struct-application2.c \
+ src/struct-btrfsbalance.c \
src/struct-btrfsqgroup.c \
src/struct-btrfssubvolume.c \
src/struct-dirent.c \
diff --git a/java/Makefile.inc b/java/Makefile.inc
index 103010f..499d3de 100644
--- a/java/Makefile.inc
+++ b/java/Makefile.inc
@@ -22,6 +22,7 @@
java_built_sources = \
com/redhat/et/libguestfs/Application.java \
com/redhat/et/libguestfs/Application2.java \
+ com/redhat/et/libguestfs/BTRFSBalance.java \
com/redhat/et/libguestfs/BTRFSQgroup.java \
com/redhat/et/libguestfs/BTRFSSubvolume.java \
com/redhat/et/libguestfs/Dirent.java \
diff --git a/java/com/redhat/et/libguestfs/.gitignore b/java/com/redhat/et/libguestfs/.gitignore
index 1d4accc..b2b1b22 100644
--- a/java/com/redhat/et/libguestfs/.gitignore
+++ b/java/com/redhat/et/libguestfs/.gitignore
@@ -1,5 +1,6 @@
Application.java
Application2.java
+BTRFSBalance.java
BTRFSQgroup.java
BTRFSSubvolume.java
Dirent.java
diff --git a/po/POTFILES b/po/POTFILES
index 6e65377..3f66c9f 100644
--- a/po/POTFILES
+++ b/po/POTFILES
@@ -230,6 +230,7 @@ gobject/src/optargs-xfs_repair.c
gobject/src/session.c
gobject/src/struct-application.c
gobject/src/struct-application2.c
+gobject/src/struct-btrfsbalance.c
gobject/src/struct-btrfsqgroup.c
gobject/src/struct-btrfssubvolume.c
gobject/src/struct-dirent.c
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index e9b7520..5379c47 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-447
+448
--
2.1.0
More information about the Libguestfs
mailing list