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authorTheodore Ts'o <tytso@mit.edu>2008-08-01 21:59:19 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-08-01 21:59:19 -0400
commit34071da71a665d8c81e3b3467c9a2e7c56386fec (patch)
treebf737db477d20e4f748eccfcf13a28e428a7e04b /fs
parentbc965ab3f2b4b7bb898b11d61d25295c2053b8ac (diff)
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: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/extents.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f554703eb92..f7529e27d79 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -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;