ext4: simulate various I/O and checksum errors when reading metadata
This allows us to test various error handling code paths
Link: https://lore.kernel.org/r/20191209012317.59398-1-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 102c385..5f993a4 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -371,7 +371,8 @@ static int ext4_validate_block_bitmap(struct super_block *sb,
if (buffer_verified(bh))
goto verified;
if (unlikely(!ext4_block_bitmap_csum_verify(sb, block_group,
- desc, bh))) {
+ desc, bh) ||
+ ext4_simulate_fail(sb, EXT4_SIM_BBITMAP_CRC))) {
ext4_unlock_group(sb, block_group);
ext4_error(sb, "bg %u: bad block bitmap checksum", block_group);
ext4_mark_group_bitmap_corrupted(sb, block_group,
@@ -505,6 +506,7 @@ int ext4_wait_block_bitmap(struct super_block *sb, ext4_group_t block_group,
if (!desc)
return -EFSCORRUPTED;
wait_on_buffer(bh);
+ ext4_simulate_fail_bh(sb, bh, EXT4_SIM_BBITMAP_EIO);
if (!buffer_uptodate(bh)) {
ext4_set_errno(sb, EIO);
ext4_error(sb, "Cannot read block bitmap - "