btrfs: enable a tracepoint when we fail tickets

When debugging early enospc problems it was useful to have a tracepoint
where we failed all tickets so I could check the state of the enospc
counters at failure time to validate my fixes.  This adds the tracpoint
so you can easily get that information.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index f79bf85..fbd492f 100644 (file)
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -824,6 +824,8 @@ static bool maybe_fail_all_tickets(struct btrfs_fs_info *fs_info,
        struct reserve_ticket *ticket;
        u64 tickets_id = space_info->tickets_id;
 
+       trace_btrfs_fail_all_tickets(fs_info, space_info);
+
        if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
                btrfs_info(fs_info, "cannot satisfy tickets, dumping space info");
                __btrfs_dump_space_info(fs_info, space_info);

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 97e16a3..c7d19ea 100644 (file)
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -2104,6 +2104,12 @@ DEFINE_EVENT(btrfs_dump_space_info, btrfs_done_preemptive_reclaim,
        TP_ARGS(fs_info, sinfo)
 );
 
+DEFINE_EVENT(btrfs_dump_space_info, btrfs_fail_all_tickets,
+       TP_PROTO(struct btrfs_fs_info *fs_info,
+                const struct btrfs_space_info *sinfo),
+       TP_ARGS(fs_info, sinfo)
+);
+
 TRACE_EVENT(btrfs_reserve_ticket,
        TP_PROTO(const struct btrfs_fs_info *fs_info, u64 flags, u64 bytes,
                 u64 start_ns, int flush, int error),