The 'qgroup show' command does not synchronize filesystem.
Therefore, 'qgroup show' may not display the correct value unless
synchronized with 'filesystem sync' command etc.
So add the '--sync' option so that we can choose whether or not
to synchronize when executing the command.
Signed-off-by: Tsutomu Itoh <t-i...@jp.fujitsu.com>
---
v2: use getopt_long with enum instead of single letter (suggested by Qu)
v3: dropped the --no-sync option and separated the patch of sort
option (suggested by David)
---
Documentation/btrfs-qgroup.asciidoc | 4 ++++
cmds-qgroup.c | 22 ++++++++++++++++++++--
2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/Documentation/btrfs-qgroup.asciidoc
b/Documentation/btrfs-qgroup.asciidoc
index 438dbc7..3053f2e 100644
--- a/Documentation/btrfs-qgroup.asciidoc
+++ b/Documentation/btrfs-qgroup.asciidoc
@@ -126,6 +126,10 @@ Prefix \'+' means ascending order and \'-' means
descending order of <attr>.
If no prefix is given, use ascending order by default.
+
If multiple <attr>s is given, use comma to separate.
++
+--sync::::
+To retrieve information after updating the state of qgroups,
+force sync of the filesystem identified by <path> before getting information.
EXIT STATUS
-----------
diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index bc15077..2a10c97 100644
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -272,8 +272,7 @@ static int cmd_qgroup_destroy(int argc, char **argv)
}
static const char * const cmd_qgroup_show_usage[] = {
- "btrfs qgroup show -pcreFf "
- "[--sort=qgroupid,rfer,excl,max_rfer,max_excl] <path>",
+ "btrfs qgroup show [options] <path>",
"Show subvolume quota groups.",
"-p print parent qgroup id",
"-c print child qgroup id",
@@ -288,6 +287,7 @@ static const char * const cmd_qgroup_show_usage[] = {
" list qgroups sorted by specified items",
" you can use '+' or '-' in front of each item.",
" (+:ascending, -:descending, ascending default)",
+ "--sync force sync of the filesystem before getting info",
NULL
};
@@ -301,6 +301,7 @@ static int cmd_qgroup_show(int argc, char **argv)
u64 qgroupid;
int filter_flag = 0;
unsigned unit_mode;
+ int sync = 0;
struct btrfs_qgroup_comparer_set *comparer_set;
struct btrfs_qgroup_filter_set *filter_set;
@@ -311,8 +312,12 @@ static int cmd_qgroup_show(int argc, char **argv)
while (1) {
int c;
+ enum {
+ GETOPT_VAL_SYNC = 256
+ };
static const struct option long_options[] = {
{"sort", required_argument, NULL, 'S'},
+ {"sync", no_argument, NULL, GETOPT_VAL_SYNC},
{ NULL, 0, NULL, 0 }
};
@@ -348,6 +353,9 @@ static int cmd_qgroup_show(int argc, char **argv)
if (ret)
usage(cmd_qgroup_show_usage);
break;
+ case GETOPT_VAL_SYNC:
+ sync = 1;
+ break;
default:
usage(cmd_qgroup_show_usage);
}
@@ -365,6 +373,16 @@ static int cmd_qgroup_show(int argc, char **argv)
return 1;
}
+ if (sync) {
+ ret = ioctl(fd, BTRFS_IOC_SYNC);
+ if (ret < 0) {
+ error("sync ioctl failed on '%s': %s", path,
+ strerror(errno));
+ close_file_or_dir(fd, dirstream);
+ goto out;
+ }
+ }
+
if (filter_flag) {
ret = lookup_path_rootid(fd, &qgroupid);
if (ret < 0) {
--
2.9.3
--
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