ecf5a6ce15
Add two trace points to log errors, one for vfs operations like mkdir or create, and one for I/O operations, like read, write or truncate. Also add the beginnings of a struct that is going to represent a data file and place a debugging ID in it for the tracepoints to record. 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/163819625632.215744.17907340966178411033.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906926297.143852.18267924605548658911.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967135390.1823006.2512120406360156424.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021534029.640689.1875723624947577095.stgit@warthog.procyon.org.uk/ # v4
203 lines
5.5 KiB
C
203 lines
5.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/* General netfs cache on cache files internal defs
|
|
*
|
|
* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*/
|
|
|
|
#ifdef pr_fmt
|
|
#undef pr_fmt
|
|
#endif
|
|
|
|
#define pr_fmt(fmt) "CacheFiles: " fmt
|
|
|
|
|
|
#include <linux/fscache-cache.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/security.h>
|
|
|
|
struct cachefiles_cache;
|
|
struct cachefiles_object;
|
|
|
|
/*
|
|
* Data file records.
|
|
*/
|
|
struct cachefiles_object {
|
|
int debug_id; /* debugging ID */
|
|
};
|
|
|
|
/*
|
|
* Cache files cache definition
|
|
*/
|
|
struct cachefiles_cache {
|
|
struct vfsmount *mnt; /* mountpoint holding the cache */
|
|
struct file *cachefilesd; /* manager daemon handle */
|
|
const struct cred *cache_cred; /* security override for accessing cache */
|
|
struct mutex daemon_mutex; /* command serialisation mutex */
|
|
wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
|
|
atomic_t gravecounter; /* graveyard uniquifier */
|
|
atomic_t f_released; /* number of objects released lately */
|
|
atomic_long_t b_released; /* number of blocks released lately */
|
|
unsigned frun_percent; /* when to stop culling (% files) */
|
|
unsigned fcull_percent; /* when to start culling (% files) */
|
|
unsigned fstop_percent; /* when to stop allocating (% files) */
|
|
unsigned brun_percent; /* when to stop culling (% blocks) */
|
|
unsigned bcull_percent; /* when to start culling (% blocks) */
|
|
unsigned bstop_percent; /* when to stop allocating (% blocks) */
|
|
unsigned bsize; /* cache's block size */
|
|
unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
|
|
uint64_t frun; /* when to stop culling */
|
|
uint64_t fcull; /* when to start culling */
|
|
uint64_t fstop; /* when to stop allocating */
|
|
sector_t brun; /* when to stop culling */
|
|
sector_t bcull; /* when to start culling */
|
|
sector_t bstop; /* when to stop allocating */
|
|
unsigned long flags;
|
|
#define CACHEFILES_READY 0 /* T if cache prepared */
|
|
#define CACHEFILES_DEAD 1 /* T if cache dead */
|
|
#define CACHEFILES_CULLING 2 /* T if cull engaged */
|
|
#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
|
|
char *rootdirname; /* name of cache root directory */
|
|
char *secctx; /* LSM security context */
|
|
char *tag; /* cache binding tag */
|
|
};
|
|
|
|
#include <trace/events/cachefiles.h>
|
|
|
|
/*
|
|
* 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
|
|
#define CACHEFILES_DEBUG_KLEAVE 2
|
|
#define CACHEFILES_DEBUG_KDEBUG 4
|
|
|
|
#define dbgprintk(FMT, ...) \
|
|
printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
|
|
|
|
#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
|
|
#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
|
|
#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
|
|
|
|
|
|
#if defined(__KDEBUG)
|
|
#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
|
|
#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
|
|
#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
|
|
|
|
#elif defined(CONFIG_CACHEFILES_DEBUG)
|
|
#define _enter(FMT, ...) \
|
|
do { \
|
|
if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
|
|
kenter(FMT, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define _leave(FMT, ...) \
|
|
do { \
|
|
if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
|
|
kleave(FMT, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define _debug(FMT, ...) \
|
|
do { \
|
|
if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
|
|
kdebug(FMT, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#else
|
|
#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
|
|
#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
|
|
#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
|
|
#endif
|
|
|
|
#if 1 /* defined(__KDEBUGALL) */
|
|
|
|
#define ASSERT(X) \
|
|
do { \
|
|
if (unlikely(!(X))) { \
|
|
pr_err("\n"); \
|
|
pr_err("Assertion failed\n"); \
|
|
BUG(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define ASSERTCMP(X, OP, Y) \
|
|
do { \
|
|
if (unlikely(!((X) OP (Y)))) { \
|
|
pr_err("\n"); \
|
|
pr_err("Assertion failed\n"); \
|
|
pr_err("%lx " #OP " %lx is false\n", \
|
|
(unsigned long)(X), (unsigned long)(Y)); \
|
|
BUG(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define ASSERTIF(C, X) \
|
|
do { \
|
|
if (unlikely((C) && !(X))) { \
|
|
pr_err("\n"); \
|
|
pr_err("Assertion failed\n"); \
|
|
BUG(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define ASSERTIFCMP(C, X, OP, Y) \
|
|
do { \
|
|
if (unlikely((C) && !((X) OP (Y)))) { \
|
|
pr_err("\n"); \
|
|
pr_err("Assertion failed\n"); \
|
|
pr_err("%lx " #OP " %lx is false\n", \
|
|
(unsigned long)(X), (unsigned long)(Y)); \
|
|
BUG(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#else
|
|
|
|
#define ASSERT(X) do {} while (0)
|
|
#define ASSERTCMP(X, OP, Y) do {} while (0)
|
|
#define ASSERTIF(C, X) do {} while (0)
|
|
#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
|
|
|
|
#endif
|