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Diffstat (limited to 'libbcache/error.h')
| -rw-r--r-- | libbcache/error.h | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/libbcache/error.h b/libbcache/error.h new file mode 100644 index 0000000..9eb9335 --- /dev/null +++ b/libbcache/error.h @@ -0,0 +1,238 @@ +#ifndef _BCACHE_ERROR_H +#define _BCACHE_ERROR_H + +#include <linux/printk.h> + +struct cache; +struct cache_set; + +/* + * XXX: separate out errors that indicate on disk data is inconsistent, and flag + * superblock as such + */ + +/* Error messages: */ + +#define __bch_cache_error(ca, fmt, ...) \ +do { \ + char _buf[BDEVNAME_SIZE]; \ + bch_err((ca)->set, "%s: " fmt, \ + bdevname((ca)->disk_sb.bdev, _buf), ##__VA_ARGS__); \ +} while (0) + +/* + * Very fatal logic/inconsistency errors: these indicate that we've majorly + * screwed up at runtime, i.e. it's not likely that it was just caused by the + * data on disk being inconsistent. These BUG(): + * + * XXX: audit and convert to inconsistent() checks + */ + +#define cache_set_bug(c, ...) \ +do { \ + bch_err(c, __VA_ARGS__); \ + BUG(); \ +} while (0) + +#define cache_set_bug_on(cond, c, ...) \ +do { \ + if (cond) \ + cache_set_bug(c, __VA_ARGS__); \ +} while (0) + +/* + * Inconsistency errors: The on disk data is inconsistent. If these occur during + * initial recovery, they don't indicate a bug in the running code - we walk all + * the metadata before modifying anything. If they occur at runtime, they + * indicate either a bug in the running code or (less likely) data is being + * silently corrupted under us. + * + * XXX: audit all inconsistent errors and make sure they're all recoverable, in + * BCH_ON_ERROR_CONTINUE mode + */ + +void bch_inconsistent_error(struct cache_set *); + +#define cache_set_inconsistent(c, ...) \ +do { \ + bch_err(c, __VA_ARGS__); \ + bch_inconsistent_error(c); \ +} while (0) + +#define cache_set_inconsistent_on(cond, c, ...) \ +({ \ + int _ret = !!(cond); \ + \ + if (_ret) \ + cache_set_inconsistent(c, __VA_ARGS__); \ + _ret; \ +}) + +/* + * Later we might want to mark only the particular device inconsistent, not the + * entire cache set: + */ + +#define cache_inconsistent(ca, ...) \ +do { \ + __bch_cache_error(ca, __VA_ARGS__); \ + bch_inconsistent_error((ca)->set); \ +} while (0) + +#define cache_inconsistent_on(cond, ca, ...) \ +({ \ + int _ret = !!(cond); \ + \ + if (_ret) \ + cache_inconsistent(ca, __VA_ARGS__); \ + _ret; \ +}) + +/* + * Fsck errors: inconsistency errors we detect at mount time, and should ideally + * be able to repair: + */ + +enum { + BCH_FSCK_OK = 0, + BCH_FSCK_ERRORS_NOT_FIXED = 1, + BCH_FSCK_REPAIR_UNIMPLEMENTED = 2, + BCH_FSCK_REPAIR_IMPOSSIBLE = 3, + BCH_FSCK_UNKNOWN_VERSION = 4, +}; + +#define unfixable_fsck_err(c, msg, ...) \ +do { \ + bch_err(c, msg " (repair unimplemented)", ##__VA_ARGS__); \ + ret = BCH_FSCK_REPAIR_UNIMPLEMENTED; \ + goto fsck_err; \ +} while (0) + +#define unfixable_fsck_err_on(cond, c, ...) \ +do { \ + if (cond) \ + unfixable_fsck_err(c, __VA_ARGS__); \ +} while (0) + +#define fsck_err(c, msg, ...) \ +do { \ + if (!(c)->opts.fix_errors) { \ + bch_err(c, msg, ##__VA_ARGS__); \ + ret = BCH_FSCK_ERRORS_NOT_FIXED; \ + goto fsck_err; \ + } \ + set_bit(CACHE_SET_FSCK_FIXED_ERRORS, &(c)->flags); \ + bch_err(c, msg ", fixing", ##__VA_ARGS__); \ +} while (0) + +#define fsck_err_on(cond, c, ...) \ +({ \ + bool _ret = (cond); \ + \ + if (_ret) \ + fsck_err(c, __VA_ARGS__); \ + _ret; \ +}) + +/* + * Fatal errors: these don't indicate a bug, but we can't continue running in RW + * mode - pretty much just due to metadata IO errors: + */ + +void bch_fatal_error(struct cache_set *); + +#define cache_set_fatal_error(c, ...) \ +do { \ + bch_err(c, __VA_ARGS__); \ + bch_fatal_error(c); \ +} while (0) + +#define cache_set_fatal_err_on(cond, c, ...) \ +({ \ + int _ret = !!(cond); \ + \ + if (_ret) \ + cache_set_fatal_error(c, __VA_ARGS__); \ + _ret; \ +}) + +#define cache_fatal_error(ca, ...) \ +do { \ + __bch_cache_error(ca, __VA_ARGS__); \ + bch_fatal_error(c); \ +} while (0) + +#define cache_fatal_io_error(ca, fmt, ...) \ +do { \ + char _buf[BDEVNAME_SIZE]; \ + \ + printk_ratelimited(KERN_ERR bch_fmt((ca)->set, \ + "fatal IO error on %s for " fmt), \ + bdevname((ca)->disk_sb.bdev, _buf), ##__VA_ARGS__); \ + bch_fatal_error((ca)->set); \ +} while (0) + +#define cache_fatal_io_err_on(cond, ca, ...) \ +({ \ + int _ret = !!(cond); \ + \ + if (_ret) \ + cache_fatal_io_error(ca, __VA_ARGS__); \ + _ret; \ +}) + +/* + * Nonfatal IO errors: either recoverable metadata IO (because we have + * replicas), or data IO - we need to log it and print out a message, but we + * don't (necessarily) want to shut down the fs: + */ + +void bch_account_io_completion(struct cache *); +void bch_account_io_completion_time(struct cache *, unsigned, int); + +void bch_nonfatal_io_error_work(struct work_struct *); + +/* Does the error handling without logging a message */ +void bch_nonfatal_io_error(struct cache *); + +#if 0 +#define cache_set_nonfatal_io_error(c, ...) \ +do { \ + bch_err(c, __VA_ARGS__); \ + bch_nonfatal_io_error(c); \ +} while (0) +#endif + +/* Logs message and handles the error: */ +#define cache_nonfatal_io_error(ca, fmt, ...) \ +do { \ + char _buf[BDEVNAME_SIZE]; \ + \ + printk_ratelimited(KERN_ERR bch_fmt((ca)->set, \ + "IO error on %s for " fmt), \ + bdevname((ca)->disk_sb.bdev, _buf), ##__VA_ARGS__); \ + bch_nonfatal_io_error(ca); \ +} while (0) + +#define cache_nonfatal_io_err_on(cond, ca, ...) \ +({ \ + bool _ret = (cond); \ + \ + if (_ret) \ + cache_nonfatal_io_error(ca, __VA_ARGS__); \ + _ret; \ +}) + +/* kill? */ + +#define __bcache_io_error(c, fmt, ...) \ + printk_ratelimited(KERN_ERR bch_fmt(c, \ + "IO error: " fmt), ##__VA_ARGS__) + +#define bcache_io_error(c, bio, fmt, ...) \ +do { \ + __bcache_io_error(c, fmt, ##__VA_ARGS__); \ + (bio)->bi_error = -EIO; \ +} while (0) + +#endif /* _BCACHE_ERROR_H */ |