btrfs: use fs_info for btrfs_handle_em_exist tracepoint

We really want to know to which filesystem the extent map events belong,
but as it cannot be reached from the extent_map pointers, we need to
pass it down the callchain.

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

5 files changed, 18 insertions, 13 deletions

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 1b8a078f92eb..6648d55e5339 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -518,6 +518,7 @@ static noinline int merge_extent_mapping(struct extent_map_tree *em_tree,
 
 /**
  * btrfs_add_extent_mapping - add extent mapping into em_tree
+ * @fs_info - used for tracepoint
  * @em_tree - the extent tree into which we want to insert the extent mapping
  * @em_in   - extent we are inserting
  * @start   - start of the logical range btrfs_get_extent() is requesting
@@ -535,7 +536,8 @@ static noinline int merge_extent_mapping(struct extent_map_tree *em_tree,
  * Return 0 on success, otherwise -EEXIST.
  *
  */
-int btrfs_add_extent_mapping(struct extent_map_tree *em_tree,
+int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
+                             struct extent_map_tree *em_tree,
                              struct extent_map **em_in, u64 start, u64 len)
 {
         int ret;
@@ -553,7 +555,7 @@ int btrfs_add_extent_mapping(struct extent_map_tree *em_tree,
 
                 existing = search_extent_mapping(em_tree, start, len);
 
-                trace_btrfs_handle_em_exist(existing, em, start, len);
+                trace_btrfs_handle_em_exist(fs_info, existing, em, start, len);
 
                 /*
                  * existing will always be non-NULL, since there must be
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 5fcb80a6ce37..25d985e7532a 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -92,7 +92,8 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen
 void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
                                          u64 start, u64 len);
-int btrfs_add_extent_mapping(struct extent_map_tree *em_tree,
+int btrfs_add_extent_mapping(struct btrfs_fs_info *fs_info,
+                             struct extent_map_tree *em_tree,
                              struct extent_map **em_in, u64 start, u64 len);
 
 #endif
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index be17cfdcbcf5..f4447986263a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7083,7 +7083,7 @@ insert:
 
         err = 0;
         write_lock(&em_tree->lock);
-        err = btrfs_add_extent_mapping(em_tree, &em, start, len);
+        err = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
         write_unlock(&em_tree->lock);
 out:
 
diff --git a/fs/btrfs/tests/extent-map-tests.c b/fs/btrfs/tests/extent-map-tests.c
index 8a39de4453e4..9c051c4a3315 100644
--- a/fs/btrfs/tests/extent-map-tests.c
+++ b/fs/btrfs/tests/extent-map-tests.c
@@ -91,7 +91,7 @@ static void test_case_1(struct btrfs_fs_info *fs_info,
         em->len = len;
         em->block_start = start;
         em->block_len = len;
-        ret = btrfs_add_extent_mapping(em_tree, &em, em->start, em->len);
+        ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
         if (ret)
                 test_msg("case1 [%llu %llu]: ret %d\n", start, start + len, ret);
         if (em &&
@@ -155,7 +155,7 @@ static void test_case_2(struct btrfs_fs_info *fs_info,
         em->len = SZ_1K;
         em->block_start = EXTENT_MAP_INLINE;
         em->block_len = (u64)-1;
-        ret = btrfs_add_extent_mapping(em_tree, &em, em->start, em->len);
+        ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, em->start, em->len);
         if (ret)
                 test_msg("case2 [0 1K]: ret %d\n", ret);
         if (em &&
@@ -201,7 +201,7 @@ static void __test_case_3(struct btrfs_fs_info *fs_info,
         em->len = SZ_16K;
         em->block_start = 0;
         em->block_len = SZ_16K;
-        ret = btrfs_add_extent_mapping(em_tree, &em, start, len);
+        ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
         if (ret)
                 test_msg("case3 [0x%llx 0x%llx): ret %d\n",
                          start, start + len, ret);
@@ -288,7 +288,7 @@ static void __test_case_4(struct btrfs_fs_info *fs_info,
         em->len = SZ_32K;
         em->block_start = 0;
         em->block_len = SZ_32K;
-        ret = btrfs_add_extent_mapping(em_tree, &em, start, len);
+        ret = btrfs_add_extent_mapping(fs_info, em_tree, &em, start, len);
         if (ret)
                 test_msg("case4 [0x%llx 0x%llx): ret %d\n",
                          start, len, ret);
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 9be469706d30..d78d8ab4bc86 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -256,11 +256,13 @@ TRACE_EVENT_CONDITION(btrfs_get_extent,
 
 TRACE_EVENT(btrfs_handle_em_exist,
 
-        TP_PROTO(const struct extent_map *existing, const struct extent_map *map, u64 start, u64 len),
+        TP_PROTO(struct btrfs_fs_info *fs_info,
+                const struct extent_map *existing, const struct extent_map *map,
+                u64 start, u64 len),
 
-        TP_ARGS(existing, map, start, len),
+        TP_ARGS(fs_info, existing, map, start, len),
 
-        TP_STRUCT__entry(
+        TP_STRUCT__entry_btrfs(
                 __field(        u64,  e_start           )
                 __field(        u64,  e_len             )
                 __field(        u64,  map_start         )
@@ -269,7 +271,7 @@ TRACE_EVENT(btrfs_handle_em_exist,
                 __field(        u64,  len               )
         ),
 
-        TP_fast_assign(
+        TP_fast_assign_btrfs(fs_info,
                 __entry->e_start        = existing->start;
                 __entry->e_len          = existing->len;
                 __entry->map_start      = map->start;
@@ -278,7 +280,7 @@ TRACE_EVENT(btrfs_handle_em_exist,
                 __entry->len            = len;
         ),
 
-        TP_printk("start=%llu len=%llu "
+        TP_printk_btrfs("start=%llu len=%llu "
                   "existing(start=%llu len=%llu) "
                   "em(start=%llu len=%llu)",
                   __entry->start,