ext4: Add markers for better debuggability

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

1 files changed, 56 insertions, 0 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 56142accf5cd..4cac8da4e0c1 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1351,6 +1351,10 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
         pgoff_t index;
         unsigned from, to;
 
+        trace_mark(ext4_write_begin,
+                   "dev %s ino %lu pos %llu len %u flags %u",
+                   inode->i_sb->s_id, inode->i_ino,
+                   (unsigned long long) pos, len, flags);
         index = pos >> PAGE_CACHE_SHIFT;
         from = pos & (PAGE_CACHE_SIZE - 1);
         to = from + len;
@@ -1422,6 +1426,10 @@ static int ext4_ordered_write_end(struct file *file,
         struct inode *inode = mapping->host;
         int ret = 0, ret2;
 
+        trace_mark(ext4_ordered_write_end,
+                   "dev %s ino %lu pos %llu len %u copied %u",
+                   inode->i_sb->s_id, inode->i_ino,
+                   (unsigned long long) pos, len, copied);
         ret = ext4_jbd2_file_inode(handle, inode);
 
         if (ret == 0) {
@@ -1460,6 +1468,10 @@ static int ext4_writeback_write_end(struct file *file,
         int ret = 0, ret2;
         loff_t new_i_size;
 
+        trace_mark(ext4_writeback_write_end,
+                   "dev %s ino %lu pos %llu len %u copied %u",
+                   inode->i_sb->s_id, inode->i_ino,
+                   (unsigned long long) pos, len, copied);
         new_i_size = pos + copied;
         if (new_i_size > EXT4_I(inode)->i_disksize) {
                 ext4_update_i_disksize(inode, new_i_size);
@@ -1495,6 +1507,10 @@ static int ext4_journalled_write_end(struct file *file,
         unsigned from, to;
         loff_t new_i_size;
 
+        trace_mark(ext4_journalled_write_end,
+                   "dev %s ino %lu pos %llu len %u copied %u",
+                   inode->i_sb->s_id, inode->i_ino,
+                   (unsigned long long) pos, len, copied);
         from = pos & (PAGE_CACHE_SIZE - 1);
         to = from + len;
 
@@ -2311,6 +2327,9 @@ static int ext4_da_writepage(struct page *page,
         struct buffer_head *page_bufs;
         struct inode *inode = page->mapping->host;
 
+        trace_mark(ext4_da_writepage,
+                   "dev %s ino %lu page_index %lu",
+                   inode->i_sb->s_id, inode->i_ino, page->index);
         size = i_size_read(inode);
         if (page->index == size >> PAGE_CACHE_SHIFT)
                 len = size & ~PAGE_CACHE_MASK;
@@ -2421,6 +2440,20 @@ static int ext4_da_writepages(struct address_space *mapping,
         int needed_blocks, ret = 0, nr_to_writebump = 0;
         struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb);
 
+        trace_mark(ext4_da_writepages,
+                   "dev %s ino %lu nr_t_write %ld "
+                   "pages_skipped %ld range_start %llu "
+                   "range_end %llu nonblocking %d "
+                   "for_kupdate %d for_reclaim %d "
+                   "for_writepages %d range_cyclic %d",
+                   inode->i_sb->s_id, inode->i_ino,
+                   wbc->nr_to_write, wbc->pages_skipped,
+                   (unsigned long long) wbc->range_start,
+                   (unsigned long long) wbc->range_end,
+                   wbc->nonblocking, wbc->for_kupdate,
+                   wbc->for_reclaim, wbc->for_writepages,
+                   wbc->range_cyclic);
+
         /*
          * No pages to write? This is mainly a kludge to avoid starting
          * a transaction for special inodes like journal inode on last iput()
@@ -2539,6 +2572,14 @@ out_writepages:
         if (!no_nrwrite_index_update)
                 wbc->no_nrwrite_index_update = 0;
         wbc->nr_to_write -= nr_to_writebump;
+        trace_mark(ext4_da_writepage_result,
+                   "dev %s ino %lu ret %d pages_written %d "
+                   "pages_skipped %ld congestion %d "
+                   "more_io %d no_nrwrite_index_update %d",
+                   inode->i_sb->s_id, inode->i_ino, ret,
+                   pages_written, wbc->pages_skipped,
+                   wbc->encountered_congestion, wbc->more_io,
+                   wbc->no_nrwrite_index_update);
         return ret;
 }
 
@@ -2590,6 +2631,11 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
                                         len, flags, pagep, fsdata);
         }
         *fsdata = (void *)0;
+
+        trace_mark(ext4_da_write_begin,
+                   "dev %s ino %lu pos %llu len %u flags %u",
+                   inode->i_sb->s_id, inode->i_ino,
+                   (unsigned long long) pos, len, flags);
 retry:
         /*
          * With delayed allocation, we don't log the i_disksize update
@@ -2679,6 +2725,10 @@ static int ext4_da_write_end(struct file *file,
                 }
         }
 
+        trace_mark(ext4_da_write_end,
+                   "dev %s ino %lu pos %llu len %u copied %u",
+                   inode->i_sb->s_id, inode->i_ino,
+                   (unsigned long long) pos, len, copied);
         start = pos & (PAGE_CACHE_SIZE - 1);
         end = start + copied - 1;
 
@@ -2892,6 +2942,9 @@ static int ext4_normal_writepage(struct page *page,
         loff_t size = i_size_read(inode);
         loff_t len;
 
+        trace_mark(ext4_normal_writepage,
+                   "dev %s ino %lu page_index %lu",
+                   inode->i_sb->s_id, inode->i_ino, page->index);
         J_ASSERT(PageLocked(page));
         if (page->index == size >> PAGE_CACHE_SHIFT)
                 len = size & ~PAGE_CACHE_MASK;
@@ -2977,6 +3030,9 @@ static int ext4_journalled_writepage(struct page *page,
         loff_t size = i_size_read(inode);
         loff_t len;
 
+        trace_mark(ext4_journalled_writepage,
+                   "dev %s ino %lu page_index %lu",
+                   inode->i_sb->s_id, inode->i_ino, page->index);
         J_ASSERT(PageLocked(page));
         if (page->index == size >> PAGE_CACHE_SHIFT)
                 len = size & ~PAGE_CACHE_MASK;