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ext4: simulate various I/O and checksum errors when reading metadata

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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>
This commit is contained in:
Theodore Ts'o
2019-11-21 13:09:43 -05:00
parent 878520ac45
commit 46f870d690
6 changed files with 79 additions and 6 deletions
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4
fs/ext4/balloc.c
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@@ -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 - "