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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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11
fs/ext4/namei.c
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@@ -109,7 +109,10 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
struct ext4_dir_entry *dirent;
int is_dx_block = 0;
bh = ext4_bread(NULL, inode, block, 0);
if (ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_EIO))
bh = ERR_PTR(-EIO);
else
bh = ext4_bread(NULL, inode, block, 0);
if (IS_ERR(bh)) {
__ext4_warning(inode->i_sb, func, line,
"inode #%lu: lblock %lu: comm %s: "
@@ -153,7 +156,8 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
* caller is sure it should be an index block.
*/
if (is_dx_block && type == INDEX) {
if (ext4_dx_csum_verify(inode, dirent))
if (ext4_dx_csum_verify(inode, dirent) &&
!ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
set_buffer_verified(bh);
else {
ext4_set_errno(inode->i_sb, EFSBADCRC);
@@ -164,7 +168,8 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
}
}
if (!is_dx_block) {
if (ext4_dirblock_csum_verify(inode, bh))
if (ext4_dirblock_csum_verify(inode, bh) &&
!ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
set_buffer_verified(bh);
else {
ext4_set_errno(inode->i_sb, EFSBADCRC);