fix: btrfs: pass btrfs_inode to btrfs_writepage_endio_finish_ordered() (v5.14)

See upstream commit:

  commit 38a39ac77e089515acbe85c6c70c3df1e728357d
  Author: Qu Wenruo <wqu@suse.com>
  Date:   Thu Apr 8 20:32:27 2021 +0800

    btrfs: pass btrfs_inode to btrfs_writepage_endio_finish_ordered()

    There is a pretty bad abuse of btrfs_writepage_endio_finish_ordered() in
    end_compressed_bio_write().

    It passes compressed pages to btrfs_writepage_endio_finish_ordered(),
    which is only supposed to accept inode pages.

    Thankfully the important info here is the inode, so let's pass
    btrfs_inode directly into btrfs_writepage_endio_finish_ordered(), and
    make @page parameter optional.

    By this, end_compressed_bio_write() can happily pass page=NULL while
    still getting everything done properly.

    Also, to cooperate with such modification, replace @page parameter for
    trace_btrfs_writepage_end_io_hook() with btrfs_inode.
    Although this removes page_index info, the existing start/len should be
    enough for most usage.

Change-Id: If96e99c2d9533d96d9d1aa6460bb7fd3ac9ed7ab
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/instrumentation/events/lttng-module/btrfs.h b/instrumentation/events/lttng-module/btrfs.h
index ca3b58c858eebebe359f470a61452ffcadd494db..af9b8bed69001ea08e4a7fb67279dd2903dc7ee8 100644 (file)
--- a/instrumentation/events/lttng-module/btrfs.h
+++ b/instrumentation/events/lttng-module/btrfs.h
@@ -578,6 +578,65 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE(btrfs__ordered_extent, btrfs_ordered_extent_put,
 )
 #endif
 
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,14,0))
+LTTNG_TRACEPOINT_EVENT(btrfs_writepage_end_io_hook,
+
+       TP_PROTO(const struct btrfs_inode *inode, u64 start, u64 end, int uptodate),
+
+       TP_ARGS(inode, start, end, uptodate),
+
+       TP_FIELDS(
+               ctf_integer(u64, ino, btrfs_ino(inode))
+               ctf_integer(u64, start, start)
+               ctf_integer(u64, end, end)
+               ctf_integer(int, uptodate, uptodate)
+               ctf_integer(u64, root_objectid, inode->root->root_key.objectid)
+       )
+)
+
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,14,0) || \
+       LTTNG_SLE_KERNEL_RANGE(4,4,73,5,0,0, 4,4,73,6,0,0) || \
+       LTTNG_SLE_KERNEL_RANGE(4,4,82,6,0,0, 4,4,82,7,0,0) || \
+       LTTNG_SLE_KERNEL_RANGE(4,4,92,6,0,0, 4,4,92,7,0,0) || \
+       LTTNG_SLE_KERNEL_RANGE(4,4,103,6,0,0, 4,5,0,0,0,0))
+
+LTTNG_TRACEPOINT_EVENT(btrfs_writepage_end_io_hook,
+
+       TP_PROTO(const struct page *page, u64 start, u64 end, int uptodate),
+
+       TP_ARGS(page, start, end, uptodate),
+
+       TP_FIELDS(
+               ctf_integer(ino_t, ino, page->mapping->host->i_ino)
+               ctf_integer(pgoff_t, index, page->index)
+               ctf_integer(u64, start, start)
+               ctf_integer(u64, end, end)
+               ctf_integer(int, uptodate, uptodate)
+               ctf_integer(u64, root_objectid,
+                       BTRFS_I(page->mapping->host)->root->root_key.objectid)
+       )
+)
+
+#else
+
+LTTNG_TRACEPOINT_EVENT(btrfs_writepage_end_io_hook,
+
+       TP_PROTO(struct page *page, u64 start, u64 end, int uptodate),
+
+       TP_ARGS(page, start, end, uptodate),
+
+       TP_FIELDS(
+               ctf_integer(ino_t, ino, page->mapping->host->i_ino)
+               ctf_integer(pgoff_t, index, page->index)
+               ctf_integer(u64, start, start)
+               ctf_integer(u64, end, end)
+               ctf_integer(int, uptodate, uptodate)
+               ctf_integer(u64, root_objectid,
+                       BTRFS_I(page->mapping->host)->root->root_key.objectid)
+       )
+)
+#endif
+
 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,14,0) || \
        LTTNG_SLE_KERNEL_RANGE(4,4,73,5,0,0, 4,4,73,6,0,0) || \
        LTTNG_SLE_KERNEL_RANGE(4,4,82,6,0,0, 4,4,82,7,0,0) || \
@@ -619,23 +678,6 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(btrfs__writepage,
        TP_ARGS(page, inode, wbc)
 )
 
-LTTNG_TRACEPOINT_EVENT(btrfs_writepage_end_io_hook,
-
-       TP_PROTO(const struct page *page, u64 start, u64 end, int uptodate),
-
-       TP_ARGS(page, start, end, uptodate),
-
-       TP_FIELDS(
-               ctf_integer(ino_t, ino, page->mapping->host->i_ino)
-               ctf_integer(pgoff_t, index, page->index)
-               ctf_integer(u64, start, start)
-               ctf_integer(u64, end, end)
-               ctf_integer(int, uptodate, uptodate)
-               ctf_integer(u64, root_objectid,
-                       BTRFS_I(page->mapping->host)->root->root_key.objectid)
-       )
-)
-
 LTTNG_TRACEPOINT_EVENT(btrfs_sync_file,
 
        TP_PROTO(const struct file *file, int datasync),
@@ -690,23 +732,6 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(btrfs__writepage,
        TP_ARGS(page, inode, wbc)
 )
 
-LTTNG_TRACEPOINT_EVENT(btrfs_writepage_end_io_hook,
-
-       TP_PROTO(struct page *page, u64 start, u64 end, int uptodate),
-
-       TP_ARGS(page, start, end, uptodate),
-
-       TP_FIELDS(
-               ctf_integer(ino_t, ino, page->mapping->host->i_ino)
-               ctf_integer(pgoff_t, index, page->index)
-               ctf_integer(u64, start, start)
-               ctf_integer(u64, end, end)
-               ctf_integer(int, uptodate, uptodate)
-               ctf_integer(u64, root_objectid,
-                       BTRFS_I(page->mapping->host)->root->root_key.objectid)
-       )
-)
-
 LTTNG_TRACEPOINT_EVENT(btrfs_sync_file,
 
        TP_PROTO(struct file *file, int datasync),