ext4: Add new tracepoint: trace_ext4_da_write_pages()

Add a new tracepoint which shows the pages that will be written using
write_cache_pages() by ext4_da_writepages().

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2 files changed, 16 insertions, 12 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 41a76e163b99..81014f4ed22d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -114,6 +114,21 @@ struct ext4_allocation_request {
 };
 
 /*
+ * For delayed allocation tracking
+ */
+struct mpage_da_data {
+        struct inode *inode;
+        sector_t b_blocknr;             /* start block number of extent */
+        size_t b_size;                  /* size of extent */
+        unsigned long b_state;          /* state of the extent */
+        unsigned long first_page, next_page;    /* extent of pages */
+        struct writeback_control *wbc;
+        int io_done;
+        int pages_written;
+        int retval;
+};
+
+/*
  * Special inodes numbers
  */
 #define EXT4_BAD_INO             1      /* Bad blocks inode */
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index ff659e757578..17802a96af9f 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1875,18 +1875,6 @@ static void ext4_da_page_release_reservation(struct page *page,
  * Delayed allocation stuff
  */
 
-struct mpage_da_data {
-        struct inode *inode;
-        sector_t b_blocknr;             /* start block number of extent */
-        size_t b_size;                  /* size of extent */
-        unsigned long b_state;          /* state of the extent */
-        unsigned long first_page, next_page;    /* extent of pages */
-        struct writeback_control *wbc;
-        int io_done;
-        int pages_written;
-        int retval;
-};
-
 /*
  * mpage_da_submit_io - walks through extent of pages and try to write
  * them with writepage() call back
@@ -2863,6 +2851,7 @@ retry:
                         mpd.io_done = 1;
                         ret = MPAGE_DA_EXTENT_TAIL;
                 }
+                trace_ext4_da_write_pages(inode, &mpd);
                 wbc->nr_to_write -= mpd.pages_written;
 
                 ext4_journal_stop(handle);