ext4: Add markers for better debuggability

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

fs/ext4/ialloc.c

@@ -210,6 +210,11 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
 
 	ino = inode->i_ino;
 	ext4_debug("freeing inode %lu\n", ino);
+	trace_mark(ext4_free_inode,
+		   "dev %s ino %lu mode %d uid %lu gid %lu bocks %llu",
+		   sb->s_id, inode->i_ino, inode->i_mode,
+		   (unsigned long) inode->i_uid, (unsigned long) inode->i_gid,
+		   (unsigned long long) inode->i_blocks);
 
 	/*
 	 * Note: we must free any quota before locking the superblock,
@@ -698,6 +703,8 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode)
 		return ERR_PTR(-EPERM);
 
 	sb = dir->i_sb;
+	trace_mark(ext4_request_inode, "dev %s dir %lu mode %d", sb->s_id,
+		   dir->i_ino, mode);
 	inode = new_inode(sb);
 	if (!inode)
 		return ERR_PTR(-ENOMEM);
@@ -925,6 +932,8 @@ got:
 	}
 
 	ext4_debug("allocating inode %lu\n", inode->i_ino);
+	trace_mark(ext4_allocate_inode, "dev %s ino %lu dir %lu mode %d",
+		   sb->s_id, inode->i_ino, dir->i_ino, mode);
 	goto really_out;
 fail:
 	ext4_std_error(sb, err);

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;

fs/ext4/mballoc.c

@@ -2878,8 +2878,9 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn)
 		discard_block = (ext4_fsblk_t) entry->group * EXT4_BLOCKS_PER_GROUP(sb)
 			+ entry->start_blk
 			+ le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
-		trace_mark(ext4_discard_blocks, "dev %s blk %llu count %u", sb->s_id,
-			   (unsigned long long) discard_block, entry->count);
+		trace_mark(ext4_discard_blocks, "dev %s blk %llu count %u",
+			   sb->s_id, (unsigned long long) discard_block,
+			   entry->count);
 		sb_issue_discard(sb, discard_block, entry->count);
 
 		kmem_cache_free(ext4_free_ext_cachep, entry);
@@ -3697,6 +3698,10 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
 
 	mb_debug("new inode pa %p: %llu/%u for %u\n", pa,
 			pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+	trace_mark(ext4_mb_new_inode_pa,
+		   "dev %s ino %lu pstart %llu len %u lstart %u",
+		   sb->s_id, ac->ac_inode->i_ino,
+		   pa->pa_pstart, pa->pa_len, pa->pa_lstart);
 
 	ext4_mb_use_inode_pa(ac, pa);
 	atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated);
@@ -3755,6 +3760,8 @@ ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
 
 	mb_debug("new group pa %p: %llu/%u for %u\n", pa,
 		 pa->pa_pstart, pa->pa_len, pa->pa_lstart);
+	trace_mark(ext4_mb_new_group_pa, "dev %s pstart %llu len %u lstart %u",
+		   sb->s_id, pa->pa_pstart, pa->pa_len, pa->pa_lstart);
 
 	ext4_mb_use_group_pa(ac, pa);
 	atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated);
@@ -3807,12 +3814,14 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
 	unsigned int next;
 	ext4_group_t group;
 	ext4_grpblk_t bit;
+	unsigned long long grp_blk_start;
 	sector_t start;
 	int err = 0;
 	int free = 0;
 
 	BUG_ON(pa->pa_deleted == 0);
 	ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
+	grp_blk_start = pa->pa_pstart - bit;
 	BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
 	end = bit + pa->pa_len;
 
@@ -3842,6 +3851,10 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
 			ext4_mb_store_history(ac);
 		}
 
+		trace_mark(ext4_mb_release_inode_pa,
+			   "dev %s ino %lu block %llu count %u",
+			   sb->s_id, pa->pa_inode->i_ino, grp_blk_start + bit,
+			   next - bit);
 		mb_free_blocks(pa->pa_inode, e4b, bit, next - bit);
 		bit = next + 1;
 	}
@@ -3875,6 +3888,8 @@ ext4_mb_release_group_pa(struct ext4_buddy *e4b,
 	if (ac)
 		ac->ac_op = EXT4_MB_HISTORY_DISCARD;
 
+	trace_mark(ext4_mb_release_group_pa, "dev %s pstart %llu len %d",
+		   sb->s_id, pa->pa_pstart, pa->pa_len);
 	BUG_ON(pa->pa_deleted == 0);
 	ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit);
 	BUG_ON(group != e4b->bd_group && pa->pa_len != 0);
@@ -4040,6 +4055,8 @@ void ext4_discard_preallocations(struct inode *inode)
 	}
 
 	mb_debug("discard preallocation for inode %lu\n", inode->i_ino);
+	trace_mark(ext4_discard_preallocations, "dev %s ino %lu", sb->s_id,
+		   inode->i_ino);
 
 	INIT_LIST_HEAD(&list);
 
@@ -4492,6 +4509,8 @@ static int ext4_mb_discard_preallocations(struct super_block *sb, int needed)
 	int ret;
 	int freed = 0;
 
+	trace_mark(ext4_mb_discard_preallocations, "dev %s needed %d",
+		   sb->s_id, needed);
 	for (i = 0; i < EXT4_SB(sb)->s_groups_count && needed > 0; i++) {
 		ret = ext4_mb_discard_group_preallocations(sb, i, needed);
 		freed += ret;
@@ -4520,6 +4539,18 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 	sb = ar->inode->i_sb;
 	sbi = EXT4_SB(sb);
 
+	trace_mark(ext4_request_blocks, "dev %s flags %u len %u ino %lu "
+		   "lblk %llu goal %llu lleft %llu lright %llu "
+		   "pleft %llu pright %llu ",
+		   sb->s_id, ar->flags, ar->len,
+		   ar->inode ? ar->inode->i_ino : 0,
+		   (unsigned long long) ar->logical,
+		   (unsigned long long) ar->goal,
+		   (unsigned long long) ar->lleft,
+		   (unsigned long long) ar->lright,
+		   (unsigned long long) ar->pleft,
+		   (unsigned long long) ar->pright);
+
 	if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag) {
 		/*
 		 * With delalloc we already reserved the blocks
@@ -4622,6 +4653,19 @@ out3:
 						reserv_blks);
 	}
 
+	trace_mark(ext4_allocate_blocks,
+		   "dev %s block %llu flags %u len %u ino %lu "
+		   "logical %llu goal %llu lleft %llu lright %llu "
+		   "pleft %llu pright %llu ",
+		   sb->s_id, (unsigned long long) block,
+		   ar->flags, ar->len, ar->inode ? ar->inode->i_ino : 0,
+		   (unsigned long long) ar->logical,
+		   (unsigned long long) ar->goal,
+		   (unsigned long long) ar->lleft,
+		   (unsigned long long) ar->lright,
+		   (unsigned long long) ar->pleft,
+		   (unsigned long long) ar->pright);
+
 	return block;
 }
 
@@ -4755,6 +4799,10 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
 	}
 
 	ext4_debug("freeing block %lu\n", block);
+	trace_mark(ext4_free_blocks,
+		   "dev %s block %llu count %lu metadata %d ino %lu",
+		   sb->s_id, (unsigned long long) block, count, metadata,
+		   inode ? inode->i_ino : 0);
 
 	ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
 	if (ac) {