Btrfs: fix wrong send_in_progress accounting
Steps to reproduce:
# mkfs.btrfs -f /dev/sda8
# mount /dev/sda8 /mnt
# btrfs sub snapshot -r /mnt /mnt/snap1
# btrfs sub snapshot -r /mnt /mnt/snap2
# btrfs send /mnt/snap1 -p /mnt/snap2 -f /mnt/1
# dmesg
The problem is that we will sort clone roots(include @send_root), it
might push @send_root before thus @send_root's @send_in_progress will
be decreased twice.
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index bff0b1a..5b69785 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4752,6 +4752,7 @@
u32 i;
u64 *clone_sources_tmp = NULL;
int clone_sources_to_rollback = 0;
+ int sort_clone_roots = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -4942,6 +4943,7 @@
sort(sctx->clone_roots, sctx->clone_roots_cnt,
sizeof(*sctx->clone_roots), __clone_root_cmp_sort,
NULL);
+ sort_clone_roots = 1;
ret = send_subvol(sctx);
if (ret < 0)
@@ -4957,11 +4959,19 @@
}
out:
- for (i = 0; sctx && i < clone_sources_to_rollback; i++)
- btrfs_root_dec_send_in_progress(sctx->clone_roots[i].root);
+ if (sort_clone_roots) {
+ for (i = 0; i < sctx->clone_roots_cnt; i++)
+ btrfs_root_dec_send_in_progress(
+ sctx->clone_roots[i].root);
+ } else {
+ for (i = 0; sctx && i < clone_sources_to_rollback; i++)
+ btrfs_root_dec_send_in_progress(
+ sctx->clone_roots[i].root);
+
+ btrfs_root_dec_send_in_progress(send_root);
+ }
if (sctx && !IS_ERR_OR_NULL(sctx->parent_root))
btrfs_root_dec_send_in_progress(sctx->parent_root);
- btrfs_root_dec_send_in_progress(send_root);
kfree(arg);
vfree(clone_sources_tmp);