Show the absolute subvol path for the associated level-0 qgroup.
Signed-off-by: Lu Fengqi <lufq.f...@cn.fujitsu.com>
---
Documentation/btrfs-qgroup.asciidoc | 2 +
cmds-qgroup.c | 7 +-
qgroup.c | 130 +++++++++++++++++++++++++++++++++---
qgroup.h | 1 +
4 files changed, 129 insertions(+), 11 deletions(-)
diff --git a/Documentation/btrfs-qgroup.asciidoc
b/Documentation/btrfs-qgroup.asciidoc
index 3053f2e6..fb48a917 100644
--- a/Documentation/btrfs-qgroup.asciidoc
+++ b/Documentation/btrfs-qgroup.asciidoc
@@ -93,6 +93,8 @@ Show all qgroups in the btrfs filesystem identified by <path>.
print parent qgroup id.
-c::::
print child qgroup id.
+-P::::
+print subvol path.
-r::::
print limit of referenced size of qgroup.
-e::::
diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index 38382ea9..9dce84ae 100644
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -277,6 +277,7 @@ static const char * const cmd_qgroup_show_usage[] = {
"Show subvolume quota groups.",
"-p print parent qgroup id",
"-c print child qgroup id",
+ "-P print subvol path",
"-r print limit of referenced size of qgroup",
"-e print limit of exclusive size of qgroup",
"-F list all qgroups which impact the given path",
@@ -322,7 +323,7 @@ static int cmd_qgroup_show(int argc, char **argv)
{ NULL, 0, NULL, 0 }
};
- c = getopt_long(argc, argv, "pcreFf", long_options, NULL);
+ c = getopt_long(argc, argv, "pcPreFf", long_options, NULL);
if (c < 0)
break;
switch (c) {
@@ -334,6 +335,10 @@ static int cmd_qgroup_show(int argc, char **argv)
btrfs_qgroup_setup_print_column(
BTRFS_QGROUP_CHILD);
break;
+ case 'P':
+ btrfs_qgroup_setup_print_column(
+ BTRFS_QGROUP_PATH);
+ break;
case 'r':
btrfs_qgroup_setup_print_column(
BTRFS_QGROUP_MAX_RFER);
diff --git a/qgroup.c b/qgroup.c
index fffdbb12..d618107e 100644
--- a/qgroup.c
+++ b/qgroup.c
@@ -62,6 +62,9 @@ struct btrfs_qgroup {
struct list_head qgroups;
/*qgroups that are members of this group*/
struct list_head members;
+
+ /* level-0 qgroup's subvolume path */
+ char *path;
};
/*
@@ -133,6 +136,13 @@ static struct {
.unit_mode = 0,
.max_len = 5,
},
+ {
+ .name = "path",
+ .column_name = "Path",
+ .need_print = 0,
+ .unit_mode = 0,
+ .max_len = 4,
+ },
{
.name = NULL,
.column_name = NULL,
@@ -253,6 +263,9 @@ static void print_qgroup_column(struct btrfs_qgroup *qgroup,
len = print_child_column(qgroup);
print_qgroup_column_add_blank(BTRFS_QGROUP_CHILD, len);
break;
+ case BTRFS_QGROUP_PATH:
+ len = printf("%s", qgroup->path ? qgroup->path : "---");
+ print_qgroup_column_add_blank(BTRFS_QGROUP_PATH, len);
default:
break;
}
@@ -267,7 +280,7 @@ static void print_single_qgroup_table(struct btrfs_qgroup
*qgroup)
continue;
print_qgroup_column(qgroup, i);
- if (i != BTRFS_QGROUP_CHILD)
+ if (i != BTRFS_QGROUP_ALL - 1)
printf(" ");
}
printf("\n");
@@ -284,7 +297,7 @@ static void print_table_head(void)
if (!btrfs_qgroup_columns[i].need_print)
continue;
if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) |
- (i == BTRFS_QGROUP_CHILD))
+ (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH))
printf("%-*s", max_len, btrfs_qgroup_columns[i].name);
else
printf("%*s", max_len, btrfs_qgroup_columns[i].name);
@@ -296,7 +309,7 @@ static void print_table_head(void)
if (!btrfs_qgroup_columns[i].need_print)
continue;
if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) |
- (i == BTRFS_QGROUP_CHILD)) {
+ (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH)) {
len = strlen(btrfs_qgroup_columns[i].name);
while (len--)
printf("-");
@@ -627,7 +640,7 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup,
u64 qgroupid,
u64 generation, u64 rfer, u64 rfer_cmpr, u64 excl,
u64 excl_cmpr, u64 flags, u64 max_rfer, u64 max_excl,
u64 rsv_rfer, u64 rsv_excl, struct btrfs_qgroup *parent,
- struct btrfs_qgroup *child)
+ struct btrfs_qgroup *child, char *path)
{
struct btrfs_qgroup *bq;
struct btrfs_qgroup_list *list;
@@ -678,6 +691,8 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup,
u64 qgroupid,
list_add_tail(&list->next_qgroup, &child->qgroups);
list_add_tail(&list->next_member, &parent->members);
}
+ bq->path = path;
+
ret = qgroup_tree_insert(qgroup_lookup, bq);
if (ret) {
error("failed to insert %llu into tree: %s",
@@ -687,6 +702,88 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup,
u64 qgroupid,
return ret;
}
+/*
+ * Construct subvolume path for level-0 qgroup according to qgroupid.
+ *
+ * Return a potiner to the path string on success.
+ * Return NULL on error or qgroup level > 0.
+ */
+static char *qgroups_path_lookup(int fd, struct qgroup_lookup *qgroup_lookup,
+ u64 qgroupid)
+{
+ struct btrfs_ioctl_search_args args;
+ struct btrfs_ioctl_search_key *sk = &args.key;
+ struct btrfs_root_ref *ref;
+ struct btrfs_ioctl_search_header sh;
+ struct btrfs_qgroup *bq;
+ char *name, *path;
+ u64 subvol_id;
+ int name_len;
+ int ret;
+
+ /* construct the path only if need print path */
+ if (!btrfs_qgroup_columns[BTRFS_QGROUP_PATH].need_print)
+ return NULL;
+
+ /* only level-0 qgroup has the corresponding subvolume*/
+ if (btrfs_qgroup_level(qgroupid))
+ return NULL;
+
+ subvol_id = btrfs_qgroup_subvid(qgroupid);
+ if (subvol_id < BTRFS_FIRST_FREE_OBJECTID ||
+ subvol_id > BTRFS_LAST_FREE_OBJECTID)
+ return NULL;
+
+ memset(&args, 0, sizeof(args));
+
+ sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
+ sk->max_type = BTRFS_ROOT_BACKREF_KEY;
+ sk->min_type = BTRFS_ROOT_BACKREF_KEY;
+ sk->max_objectid = subvol_id;
+ sk->min_objectid = subvol_id;
+ sk->max_offset = (u64)-1;
+ sk->max_transid = (u64)-1;
+
+ sk->nr_items = 4096;
+ ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
+ if (ret < 0)
+ return NULL;
+ if (!sk->nr_items)
+ return NULL;
+
+ /* resolve the ROOT_BACKREF to get the subvolume name*/
+ memcpy(&sh, args.buf, sizeof(sh));
+ ref = (struct btrfs_root_ref *)(args.buf + sizeof(sh));
+ name_len = btrfs_stack_root_ref_name_len(ref);
+ name = (char *)(ref + 1);
+
+ /*
+ * directly return subvolume name if top level is the initial subvolume
+ */
+ if (sh.offset == BTRFS_FS_TREE_OBJECTID)
+ return strndup(name, name_len);
+
+ /*
+ * construct path based on the upper subvolume path and the subvolume
+ * name
+ */
+ bq = qgroup_tree_search(qgroup_lookup, sh.offset);
+ if (!bq || bq->qgroupid != sh.offset)
+ return NULL;
+
+ /*
+ * 2 means the path delimiter '/' and the terminating null byte ('\0')
+ */
+ path = malloc(strlen(name) + strlen(bq->path) + 2);
+ if (!path) {
+ perror("malloc failed");
+ exit(1);
+ }
+ sprintf(path, "%s/%s", bq->path, name);
+
+ return path;
+}
+
static void __free_btrfs_qgroup(struct btrfs_qgroup *bq)
{
struct btrfs_qgroup_list *list;
@@ -706,6 +803,8 @@ static void __free_btrfs_qgroup(struct btrfs_qgroup *bq)
list_del(&list->next_member);
free(list);
}
+ if (bq->path)
+ free(bq->path);
free(bq);
}
@@ -979,6 +1078,11 @@ static void __update_columns_max_len(struct btrfs_qgroup
*bq,
if (btrfs_qgroup_columns[column].max_len < len)
btrfs_qgroup_columns[column].max_len = len;
break;
+ case BTRFS_QGROUP_PATH:
+ len = bq->path ? strlen(bq->path) : 0;
+ if (btrfs_qgroup_columns[column].max_len < len)
+ btrfs_qgroup_columns[column].max_len = len;
+ break;
default:
break;
}
@@ -1092,8 +1196,12 @@ static int __qgroups_search(int fd, struct qgroup_lookup
*qgroup_lookup)
print_status_flag_warning(flags);
} else if (btrfs_search_header_type(sh)
== BTRFS_QGROUP_INFO_KEY) {
+ u64 qgroupid;
+ char *path;
+
info = (struct btrfs_qgroup_info_item *)
(args.buf + off);
+ qgroupid = btrfs_search_header_offset(sh);
a1 = btrfs_stack_qgroup_info_generation(info);
a2 = btrfs_stack_qgroup_info_referenced(info);
a3 =
@@ -1103,10 +1211,11 @@ static int __qgroups_search(int fd, struct
qgroup_lookup *qgroup_lookup)
a5 =
btrfs_stack_qgroup_info_exclusive_compressed
(info);
- add_qgroup(qgroup_lookup,
- btrfs_search_header_offset(sh), a1,
- a2, a3, a4, a5, 0, 0, 0, 0, 0, NULL,
- NULL);
+ path = qgroups_path_lookup(fd, qgroup_lookup,
+ qgroupid);
+ add_qgroup(qgroup_lookup, qgroupid, a1, a2, a3,
+ a4, a5, 0, 0, 0, 0, 0, NULL, NULL,
+ path);
} else if (btrfs_search_header_type(sh)
== BTRFS_QGROUP_LIMIT_KEY) {
limit = (struct btrfs_qgroup_limit_item *)
@@ -1124,7 +1233,7 @@ static int __qgroups_search(int fd, struct qgroup_lookup
*qgroup_lookup)
add_qgroup(qgroup_lookup,
btrfs_search_header_offset(sh), 0,
0, 0, 0, 0, a1, a2, a3, a4, a5,
- NULL, NULL);
+ NULL, NULL, NULL);
} else if (btrfs_search_header_type(sh)
== BTRFS_QGROUP_RELATION_KEY) {
if (btrfs_search_header_offset(sh)
@@ -1140,7 +1249,8 @@ static int __qgroups_search(int fd, struct qgroup_lookup
*qgroup_lookup)
goto skip;
add_qgroup(qgroup_lookup,
btrfs_search_header_offset(sh), 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1);
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1,
+ NULL);
} else
goto done;
skip:
diff --git a/qgroup.h b/qgroup.h
index 875fbdf3..2003f834 100644
--- a/qgroup.h
+++ b/qgroup.h
@@ -59,6 +59,7 @@ enum btrfs_qgroup_column_enum {
BTRFS_QGROUP_MAX_EXCL,
BTRFS_QGROUP_PARENT,
BTRFS_QGROUP_CHILD,
+ BTRFS_QGROUP_PATH,
BTRFS_QGROUP_ALL,
};
--
2.14.2
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