As one user in mail list report reproducible balance ENOSPC error, it's
better to add more debug info for enospc_debug mount option.
Reported-by: Marc Haber <mh+linux-btrfs@xxxxxxxxxxxx>
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
fs/btrfs/extent-tree.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 083783b..a95d247 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9386,15 +9386,23 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
u64 dev_min = 1;
u64 dev_nr = 0;
u64 target;
+ int debug;
int index;
int full = 0;
int ret = 0;
+ debug = btrfs_test_opt(root, ENOSPC_DEBUG);
+
block_group = btrfs_lookup_block_group(root->fs_info, bytenr);
/* odd, couldn't find the block group, leave it alone */
- if (!block_group)
+ if (!block_group) {
+ if (debug)
+ btrfs_warn(root->fs_info,
+ "Can't find block group %llu\n",
+ bytenr);
return -1;
+ }
min_free = btrfs_block_group_used(&block_group->item);
@@ -9448,8 +9456,11 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
* this is just a balance, so if we were marked as full
* we know there is no space for a new chunk
*/
- if (full)
+ if (full) {
+ if (debug)
+ btrfs_warn(root->fs_info, "space info full");
goto out;
+ }
index = get_block_group_index(block_group);
}
@@ -9496,6 +9507,8 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
ret = -1;
}
}
+ if (debug && ret == -1)
+ btrfs_warn(root->fs_info, "no space to allocate a new chunk");
mutex_unlock(&root->fs_info->chunk_mutex);
btrfs_end_transaction(trans, root);
out:
--
2.7.2
--
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