[Libguestfs] [PATCH 1/2] New API: get_min_size
Maxim Perevedentsev
mperevedentsev at virtuozzo.com
Fri Oct 16 16:44:20 UTC 2015
This call provides the way to get minimum size of filesystem.
This is needed for shrinking. The return units are bytes.
---
daemon/Makefile.am | 1 +
daemon/daemon.h | 1 +
daemon/fs-min-size.c | 46 +++++++++++++++++++++++++++++++++++
daemon/ntfs.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++
generator/actions.ml | 15 ++++++++++++
po/POTFILES | 1 +
src/MAX_PROC_NR | 2 +-
7 files changed, 133 insertions(+), 1 deletion(-)
create mode 100644 daemon/fs-min-size.c
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 4ea3c88..0a01a24 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -116,6 +116,7 @@ guestfsd_SOURCES = \
findfs.c \
fill.c \
find.c \
+ fs-min-size.c \
fsck.c \
fstrim.c \
glob.c \
diff --git a/daemon/daemon.h b/daemon/daemon.h
index 508691a..8287a99 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -283,6 +283,7 @@ extern int btrfs_set_uuid_random (const char *device);
/*-- in ntfs.c --*/
extern char *ntfs_get_label (const char *device);
extern int ntfs_set_label (const char *device, const char *label);
+extern int64_t ntfs_get_min_size (const char *device);
/*-- in swap.c --*/
extern int swap_set_uuid (const char *device, const char *uuid);
diff --git a/daemon/fs-min-size.c b/daemon/fs-min-size.c
new file mode 100644
index 0000000..12448c0
--- /dev/null
+++ b/daemon/fs-min-size.c
@@ -0,0 +1,46 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2012 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "daemon.h"
+#include "actions.h"
+
+int64_t
+do_get_min_size(const mountable_t *mountable)
+{
+ int64_t r;
+
+ /* How we set the label depends on the filesystem type. */
+ CLEANUP_FREE char *vfs_type = do_vfs_type (mountable);
+ if (vfs_type == NULL)
+ return -1;
+
+ else if (STREQ (vfs_type, "ntfs"))
+ r = ntfs_get_min_size (mountable->device);
+
+ else
+ NOT_SUPPORTED (-1, "don't know how to get minimum size of '%s' filesystems",
+ vfs_type);
+
+ return r;
+}
diff --git a/daemon/ntfs.c b/daemon/ntfs.c
index 1ead159..fd77716 100644
--- a/daemon/ntfs.c
+++ b/daemon/ntfs.c
@@ -153,6 +153,74 @@ do_ntfsresize_size (const char *device, int64_t size)
return do_ntfsresize (device, size, 0);
}
+int64_t
+ntfs_get_min_size (const char *device)
+{
+ CLEANUP_FREE char *err = NULL, *out = NULL;
+ CLEANUP_FREE_STRING_LIST char **lines = NULL;
+ int r;
+ size_t i;
+ char *p;
+ int64_t ret, volume_size = 0;
+ const char *size_pattern = "You might resize at ",
+ *full_pattern = "Volume is full",
+ *cluster_size_pattern = "Cluster size",
+ *volume_size_pattern = "Current volume size:";
+ int is_full = 0;
+ int32_t cluster_size = 0;
+
+ /* FS may be marked for check, so force ntfsresize */
+ r = command (&out, &err, str_ntfsresize, "--info", "-ff", device, NULL);
+
+ lines = split_lines (out);
+ if (lines == NULL)
+ return -1;
+
+ if (verbose) {
+ for (i = 0; lines[i] != NULL; ++i)
+ fprintf (stderr, "ntfs_min_size: lines[%zu] = \"%s\"\n", i, lines[i]);
+ }
+
+ if (r == -1) {
+ /* If volume is full, ntfsresize returns error. */
+ for (i = 0; lines[i] != NULL; ++i) {
+ if (strstr (lines[i], full_pattern))
+ is_full = 1;
+ else if ((p = strstr (lines[i], cluster_size_pattern))) {
+ if (sscanf (p + strlen(cluster_size_pattern),
+ "%*[ ]:%" SCNd32, &cluster_size) != 1)
+ return -1;
+ }
+ else if ((p = strstr (lines[i], volume_size_pattern))) {
+ if (sscanf (p + strlen(volume_size_pattern),
+ "%" SCNd64, &volume_size) != 1)
+ return -1;
+ }
+ }
+ if (is_full) {
+ /* Ceil to cluster size */
+ if (cluster_size == 0) {
+ reply_with_error("%s", "Bad cluster size");
+ return -1;
+ }
+ return (volume_size + cluster_size - 1) / cluster_size * cluster_size;
+ }
+
+ reply_with_error ("%s", err);
+ return -1;
+ }
+
+ for (i = 0; lines[i] != NULL; ++i) {
+ if ((p = strstr (lines[i], size_pattern))) {
+ if (sscanf (p + strlen(size_pattern), "%" SCNd64, &ret) != 1)
+ return -1;
+ return ret;
+ }
+ }
+
+ return -1;
+}
+
/* Takes optional arguments, consult optargs_bitmask. */
int
do_ntfsfix (const char *device, int clearbadsectors)
diff --git a/generator/actions.ml b/generator/actions.ml
index 274ef3f..e88dfe7 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -12765,6 +12765,21 @@ Get the estimated minimum filesystem size of an ext2/3/4 filesystem in blocks.
See also L<resize2fs(8)>." };
+ { defaults with
+ name = "get_min_size"; added = (1, 31, 18);
+ style = RInt64 "sizeinbytes", [Mountable "mountable"], [];
+ proc_nr = Some 458;
+ tests = [
+ InitPartition, IfAvailable "ntfsprogs", TestRun(
+ [["mkfs"; "ntfs"; "/dev/sda1"; ""; "NOARG"; ""; ""; "NOARG"];
+ ["get_min_size"; "/dev/sda1"]]), [];
+ ];
+ shortdesc = "get minimum filesystem size";
+ longdesc = "\
+Get the minimum size of filesystem in bytes. This is the minimum possible size for filesystem shrinking.
+
+See also L<ntfsresize(8)>." };
+
]
(* Non-API meta-commands available only in guestfish.
diff --git a/po/POTFILES b/po/POTFILES
index cd2c437..d90772a 100644
--- a/po/POTFILES
+++ b/po/POTFILES
@@ -49,6 +49,7 @@ daemon/file.c
daemon/fill.c
daemon/find.c
daemon/findfs.c
+daemon/fs-min-size.c
daemon/fsck.c
daemon/fstrim.c
daemon/glob.c
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index de2a00c..c92ddb6 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-457
+458
--
1.8.3.1
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