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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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6
fs/ext4/inode.c
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@@ -4243,6 +4243,8 @@ static int __ext4_get_inode_loc(struct inode *inode,
bh = sb_getblk(sb, block);
if (unlikely(!bh))
return -ENOMEM;
if (ext4_simulate_fail(sb, EXT4_SIM_INODE_EIO))
goto simulate_eio;
if (!buffer_uptodate(bh)) {
lock_buffer(bh);
@@ -4341,6 +4343,7 @@ make_io:
blk_finish_plug(&plug);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
simulate_eio:
ext4_set_errno(inode->i_sb, EIO);
EXT4_ERROR_INODE_BLOCK(inode, block,
"unable to read itable block");
@@ -4555,7 +4558,8 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
sizeof(gen));
}
if (!ext4_inode_csum_verify(inode, raw_inode, ei)) {
if (!ext4_inode_csum_verify(inode, raw_inode, ei) ||
ext4_simulate_fail(sb, EXT4_SIM_INODE_CRC)) {
ext4_set_errno(inode->i_sb, EFSBADCRC);
ext4_error_inode(inode, function, line, 0,
"iget: checksum invalid");