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| author | Theodore Ts'o <tytso@mit.edu> | 2019-11-21 13:09:43 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-12-26 11:28:31 -0500 |
| commit | 46f870d690fecc792a66730dcbbf0aa109f5f9ab (patch) | |
| tree | 0e517f47ca1c5073481e0d8bfc8631f24388dbca /fs/ext4/ext4.h | |
| parent | 878520ac45f9f698432d4276db3d9144b83931b6 (diff) | |
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>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index b00d07bad45b..5edc16d36a96 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1557,6 +1557,9 @@ struct ext4_sb_info { /* Barrier between changing inodes' journal flags and writepages ops. */ struct percpu_rw_semaphore s_journal_flag_rwsem; struct dax_device *s_daxdev; +#ifdef CONFIG_EXT4_DEBUG + unsigned long s_simulate_fail; +#endif }; static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) @@ -1576,6 +1579,40 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) } /* + * Simulate_fail codes + */ +#define EXT4_SIM_BBITMAP_EIO 1 +#define EXT4_SIM_BBITMAP_CRC 2 +#define EXT4_SIM_IBITMAP_EIO 3 +#define EXT4_SIM_IBITMAP_CRC 4 +#define EXT4_SIM_INODE_EIO 5 +#define EXT4_SIM_INODE_CRC 6 +#define EXT4_SIM_DIRBLOCK_EIO 7 +#define EXT4_SIM_DIRBLOCK_CRC 8 + +static inline bool ext4_simulate_fail(struct super_block *sb, + unsigned long code) +{ +#ifdef CONFIG_EXT4_DEBUG + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (unlikely(sbi->s_simulate_fail == code)) { + sbi->s_simulate_fail = 0; + return true; + } +#endif + return false; +} + +static inline void ext4_simulate_fail_bh(struct super_block *sb, + struct buffer_head *bh, + unsigned long code) +{ + if (!IS_ERR(bh) && ext4_simulate_fail(sb, code)) + clear_buffer_uptodate(bh); +} + +/* * Error number codes for s_{first,last}_error_errno * * Linux errno numbers are architecture specific, so we need to translate |