This patch add a support for user to limit the data, metadata,
or mixed of a qgroup. Even you can set these three limits at
one time for a qgroup.
Signed-off-by: Dongsheng Yang <yangds.f...@cn.fujitsu.com>
---
cmds-qgroup.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
ioctl.h | 13 +++++++++++++
2 files changed, 60 insertions(+), 1 deletion(-)
diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index c5082f7..1c42fc8 100644
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -367,14 +367,46 @@ static const char * const cmd_qgroup_limit_usage[] = {
"-c limit amount of data after compression. This is the default,",
" it is currently not possible to turn off this option.",
"-e limit space exclusively assigned to this qgroup",
+ "-t limit space for data, metadata or mixed",
NULL
};
+inline u8 get_limit_type(u64 flag)
+{
+ return (flag >> BTRFS_QGROUP_LIMIT_TYPE_SHIFT);
+}
+
+inline u64 set_limit_type(u64 flag, u8 type)
+{
+ u64 temp = (flag >> BTRFS_QGROUP_LIMIT_TYPE_SHIFT);
+
+ temp |= type;
+ flag |= (temp << BTRFS_QGROUP_LIMIT_TYPE_SHIFT);
+
+ return flag;
+}
+
+static int parse_limit_type(u8 *qgroup_type, char *arg)
+{
+ if (strcmp(arg, "data") == 0)
+ *qgroup_type = BTRFS_QGROUP_LIMIT_DATA;
+ else if (strcmp(arg, "metadata") == 0)
+ *qgroup_type = BTRFS_QGROUP_LIMIT_METADATA;
+ else if (strcmp(arg, "mixed") == 0) {
+ *qgroup_type = BTRFS_QGROUP_LIMIT_MIXED;
+ } else {
+ fprintf(stderr, "ERROR: Invalid qgroup type arguments given\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
static int cmd_qgroup_limit(int argc, char **argv)
{
int ret = 0;
int fd;
int e;
+ u8 type = BTRFS_QGROUP_LIMIT_MIXED;
char *path = NULL;
struct btrfs_ioctl_qgroup_limit_args args;
unsigned long long size;
@@ -384,7 +416,14 @@ static int cmd_qgroup_limit(int argc, char **argv)
optind = 1;
while (1) {
- int c = getopt(argc, argv, "ce");
+ int c;
+ static const struct option long_options[] = {
+ {"type", required_argument, NULL, 't'},
+ {NULL, 0, NULL, 0}
+ };
+
+ c = getopt_long(argc, argv, "ce",
+ long_options, NULL);
if (c < 0)
break;
switch (c) {
@@ -394,6 +433,11 @@ static int cmd_qgroup_limit(int argc, char **argv)
case 'e':
exclusive = 1;
break;
+ case 't':
+ ret = parse_limit_type(&type, optarg);
+ if (ret)
+ return -EINVAL;
+ break;
default:
usage(cmd_qgroup_limit_usage);
}
@@ -419,6 +463,8 @@ static int cmd_qgroup_limit(int argc, char **argv)
args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_RFER;
args.lim.max_referenced = size;
}
+
+ args.lim.flags = set_limit_type(args.lim.flags, type);
}
if (argc - optind == 2) {
diff --git a/ioctl.h b/ioctl.h
index d550ca6..a1ebbb5 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -45,6 +45,19 @@ struct btrfs_ioctl_vol_args {
#define BTRFS_QGROUP_INHERIT_SET_LIMITS (1ULL << 0)
+/*
+ * As we can account and limit data and metadata in
+ * a qgroup separately. We use the first 8 bits in
+ * btrfs_qgroup_limit->flags to specify the type we
+ * want to limit. Currently, there are three choice:
+ * DATA, METADATA, MIXED.
+ */
+#define BTRFS_QGROUP_LIMIT_TYPE_SHIFT 56
+
+#define BTRFS_QGROUP_LIMIT_DATA 1
+#define BTRFS_QGROUP_LIMIT_METADATA 2
+#define BTRFS_QGROUP_LIMIT_MIXED 4
+
struct btrfs_qgroup_limit {
__u64 flags;
__u64 max_referenced;
--
1.8.4.2
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