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| author |   David Howells <dhowells@redhat.com> | 2021-10-21 08:15:26 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-01-07 13:40:56 +0000 |
| commit | a70f6526267e9f5fbf958a69c6112938b0b14bc4 (patch) | |
| tree | b795158ca0ec0b87b96a84efeaf8160baec8d30a /fs/cachefiles/internal.h | |
| parent | cachefiles: Define structs (diff) | |
| download | linux-dev-a70f6526267e9f5fbf958a69c6112938b0b14bc4.tar.xz linux-dev-a70f6526267e9f5fbf958a69c6112938b0b14bc4.zip | |
cachefiles: Add some error injection support
Add support for injecting ENOSPC or EIO errors. This needs to be enabled
by CONFIG_CACHEFILES_ERROR_INJECTION=y. Once enabled, ENOSPC on things
like write and mkdir can be triggered by:
echo 1 >/proc/sys/cachefiles/error_injection
and EIO can be triggered on most operations by:
echo 2 >/proc/sys/cachefiles/error_injection
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819624706.215744.6911916249119962943.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906925343.143852.5465695512984025812.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967134412.1823006.7354285948280296595.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021532340.640689.18209494225772443698.stgit@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'fs/cachefiles/internal.h')
| -rw-r--r-- | fs/cachefiles/internal.h | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index cff4b2a5f928..1f2fea902d3e 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -64,7 +64,47 @@ struct cachefiles_cache { /* - * Debug tracing. + * error_inject.c + */ +#ifdef CONFIG_CACHEFILES_ERROR_INJECTION +extern unsigned int cachefiles_error_injection_state; +extern int cachefiles_register_error_injection(void); +extern void cachefiles_unregister_error_injection(void); + +#else +#define cachefiles_error_injection_state 0 + +static inline int cachefiles_register_error_injection(void) +{ + return 0; +} + +static inline void cachefiles_unregister_error_injection(void) +{ +} +#endif + + +static inline int cachefiles_inject_read_error(void) +{ + return cachefiles_error_injection_state & 2 ? -EIO : 0; +} + +static inline int cachefiles_inject_write_error(void) +{ + return cachefiles_error_injection_state & 2 ? -EIO : + cachefiles_error_injection_state & 1 ? -ENOSPC : + 0; +} + +static inline int cachefiles_inject_remove_error(void) +{ + return cachefiles_error_injection_state & 2 ? -EIO : 0; +} + + +/* + * Debug tracing */ extern unsigned cachefiles_debug; #define CACHEFILES_DEBUG_KENTER 1 |