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authorLennart Poettering <lennart@poettering.net>2015-11-13 18:07:39 +0100
committerLennart Poettering <lennart@poettering.net>2015-11-13 19:50:52 +0100
commit08c77cf3987b52d0380b3d7d239ba254447692ee (patch)
tree6f91c12899feecda9252cd70d5c775d0cdeae2ed /src/basic/btrfs-util.c
parent0af20ea2ee2af2bcf2258e7a8e1a13181a6a75d6 (diff)
btrfs: properly handle the case when a subvol has no parent
Don't be confused by subvols without parent. This is after all how the root subvol is set up.
Diffstat (limited to 'src/basic/btrfs-util.c')
-rw-r--r--src/basic/btrfs-util.c31
1 files changed, 20 insertions, 11 deletions
diff --git a/src/basic/btrfs-util.c b/src/basic/btrfs-util.c
index 290fabdeff..8c2d76b8aa 100644
--- a/src/basic/btrfs-util.c
+++ b/src/basic/btrfs-util.c
@@ -1423,12 +1423,16 @@ static int copy_quota_hierarchy(int fd, uint64_t old_subvol_id, uint64_t new_sub
return n_old_qgroups;
r = btrfs_subvol_get_parent(fd, old_subvol_id, &old_parent_id);
- if (r < 0)
+ if (r == -ENXIO)
+ /* We have no parent, hence nothing to copy. */
+ n_old_parent_qgroups = 0;
+ else if (r < 0)
return r;
-
- n_old_parent_qgroups = btrfs_qgroup_find_parents(fd, old_parent_id, &old_parent_qgroups);
- if (n_old_parent_qgroups < 0)
- return n_old_parent_qgroups;
+ else {
+ n_old_parent_qgroups = btrfs_qgroup_find_parents(fd, old_parent_id, &old_parent_qgroups);
+ if (n_old_parent_qgroups < 0)
+ return n_old_parent_qgroups;
+ }
for (i = 0; i < n_old_qgroups; i++) {
uint64_t id;
@@ -1885,14 +1889,19 @@ int btrfs_subvol_auto_qgroup_fd(int fd, uint64_t subvol_id, bool insert_intermed
if (n > 0) /* already parent qgroups set up, let's bail */
return 0;
+ qgroups = mfree(qgroups);
+
r = btrfs_subvol_get_parent(fd, subvol_id, &parent_subvol);
- if (r < 0)
+ if (r == -ENXIO)
+ /* No parent, hence no qgroup memberships */
+ n = 0;
+ else if (r < 0)
return r;
-
- qgroups = mfree(qgroups);
- n = btrfs_qgroup_find_parents(fd, parent_subvol, &qgroups);
- if (n < 0)
- return n;
+ else {
+ n = btrfs_qgroup_find_parents(fd, parent_subvol, &qgroups);
+ if (n < 0)
+ return n;
+ }
if (insert_intermediary_qgroup) {
uint64_t lowest = 256, new_qgroupid;