[lttng-dev] [PATCH lttng-modules 2/3] Add btrfs file item tracepoints

[Michael Jeanson]

See upstream commit:

  commit 09ed2f165cb3449237dec842b3564044e12d22cb
  Author: Liu Bo <bo.li.liu at oracle.com>
  Date:   Fri Mar 10 11:09:48 2017 -0800

    Btrfs: add file item tracepoints

    While debugging truncate problems, I found that these tracepoints could
    help us quickly know what went wrong.

    Two sets of tracepoints are created to track regular/prealloc file item
    and inline file item respectively, I put inline as a separate one since
    what inline file items cares about are way less than the regular one.

    This adds four tracepoints:
    - btrfs_get_extent_show_fi_regular
    - btrfs_get_extent_show_fi_inline
    - btrfs_truncate_show_fi_regular
    - btrfs_truncate_show_fi_inline

Signed-off-by: Michael Jeanson <mjeanson at efficios.com>
---
 instrumentation/events/lttng-module/btrfs.h | 83 +++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/instrumentation/events/lttng-module/btrfs.h b/instrumentation/events/lttng-module/btrfs.h
index c413e92..6ef21e0 100644
--- a/instrumentation/events/lttng-module/btrfs.h
+++ b/instrumentation/events/lttng-module/btrfs.h
@@ -291,6 +291,89 @@ LTTNG_TRACEPOINT_EVENT(btrfs_handle_em_exist,
 )
 #endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
+LTTNG_TRACEPOINT_EVENT_CLASS(btrfs__file_extent_item_regular,
+
+	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
+		 struct btrfs_file_extent_item *fi, u64 start),
+
+	TP_ARGS(bi, l, fi, start),
+
+	TP_FIELDS(
+		ctf_array(u8, fsid, bi->root->fs_info, BTRFS_FSID_SIZE)
+		ctf_integer(u64, root_obj, bi->root->objectid)
+		ctf_integer(u64, ino, btrfs_ino(bi))
+		ctf_integer(loff_t, isize, bi->vfs_inode.i_size)
+		ctf_integer(u64, disk_isize, bi->disk_i_size)
+		ctf_integer(u64, num_bytes, btrfs_file_extent_num_bytes(l, fi))
+		ctf_integer(u64, ram_bytes, btrfs_file_extent_ram_bytes(l, fi))
+		ctf_integer(u64, disk_bytenr, btrfs_file_extent_disk_bytenr(l, fi))
+		ctf_integer(u64, disk_num_bytes, btrfs_file_extent_disk_num_bytes(l, fi))
+		ctf_integer(u64, extent_offset, btrfs_file_extent_offset(l, fi))
+		ctf_integer(u8, extent_type, btrfs_file_extent_type(l, fi))
+		ctf_integer(u8, compression, btrfs_file_extent_compression(l, fi))
+		ctf_integer(u64, extent_start, start)
+		ctf_integer(u64, extent_end, (start + btrfs_file_extent_num_bytes(l, fi)))
+	)
+)
+
+LTTNG_TRACEPOINT_EVENT_CLASS(btrfs__file_extent_item_inline,
+
+	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
+		 struct btrfs_file_extent_item *fi, int slot, u64 start),
+
+	TP_ARGS(bi, l, fi, slot, start),
+
+	TP_FIELDS(
+		ctf_array(u8, fsid, bi->root->fs_info, BTRFS_FSID_SIZE)
+		ctf_integer(u64, root_obj, bi->root->objectid)
+		ctf_integer(u64, ino, btrfs_ino(bi))
+		ctf_integer(loff_t, isize, bi->vfs_inode.i_size)
+		ctf_integer(u64, disk_isize, bi->disk_i_size)
+		ctf_integer(u8, extent_type, btrfs_file_extent_type(l, fi))
+		ctf_integer(u8, compression, btrfs_file_extent_compression(l, fi))
+		ctf_integer(u64, extent_start, start)
+		ctf_integer(u64, extent_end, (start + btrfs_file_extent_inline_len(l, slot, fi)))
+	)
+)
+
+LTTNG_TRACEPOINT_EVENT_INSTANCE(
+	btrfs__file_extent_item_regular, btrfs_get_extent_show_fi_regular,
+
+	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
+		 struct btrfs_file_extent_item *fi, u64 start),
+
+	TP_ARGS(bi, l, fi, start)
+)
+
+LTTNG_TRACEPOINT_EVENT_INSTANCE(
+	btrfs__file_extent_item_regular, btrfs_truncate_show_fi_regular,
+
+	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
+		 struct btrfs_file_extent_item *fi, u64 start),
+
+	TP_ARGS(bi, l, fi, start)
+)
+
+LTTNG_TRACEPOINT_EVENT_INSTANCE(
+	btrfs__file_extent_item_inline, btrfs_get_extent_show_fi_inline,
+
+	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
+		 struct btrfs_file_extent_item *fi, int slot, u64 start),
+
+	TP_ARGS(bi, l, fi, slot, start)
+)
+
+LTTNG_TRACEPOINT_EVENT_INSTANCE(
+	btrfs__file_extent_item_inline, btrfs_truncate_show_fi_inline,
+
+	TP_PROTO(struct btrfs_inode *bi, struct extent_buffer *l,
+		 struct btrfs_file_extent_item *fi, int slot, u64 start),
+
+	TP_ARGS(bi, l, fi, slot, start)
+)
+#endif
+
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0))
 LTTNG_TRACEPOINT_EVENT_CLASS(btrfs__ordered_extent,
 
-- 
2.17.1