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Commit 34071da7 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: don't assume extents can't cross block groups when truncating 



With the FLEX_BG layout, there is no reason why extents can't cross
block groups, so make the truncate code reserve enough credits so we
don't BUG if we come across such an extent.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent bc965ab3

fs/ext4/extents.c

+7 −3
Original line number Diff line number Diff line
@@ -1910,9 +1910,13 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, 
			BUG_ON(b != ex_ee_block + ex_ee_len - 1);

		}



		/* at present, extent can't cross block group: */

		/* leaf + bitmap + group desc + sb + inode */

		credits = 5;

		/*

		 * 3 for leaf, sb, and inode plus 2 (bmap and group

		 * descriptor) for each block group; assume two block

		 * groups plus ex_ee_len/blocks_per_block_group for

		 * the worst case

		 */

		credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb));

		if (ex == EXT_FIRST_EXTENT(eh)) {

			correct_index = 1;

			credits += (ext_depth(inode)) + 1;