- 根目录:
- fs
- fscache
- fsdef.c
#define FSCACHE_DEBUG_LEVEL CACHE
#include <linux/module.h>
#include "internal.h"
static uint16_t fscache_fsdef_netfs_get_key(const void *cookie_netfs_data,
void *buffer, uint16_t bufmax);
static uint16_t fscache_fsdef_netfs_get_aux(const void *cookie_netfs_data,
void *buffer, uint16_t bufmax);
static
enum fscache_checkaux fscache_fsdef_netfs_check_aux(void *cookie_netfs_data,
const void *data,
uint16_t datalen);
static struct fscache_cookie_def fscache_fsdef_index_def = {
.name = ".FS-Cache",
.type = FSCACHE_COOKIE_TYPE_INDEX,
};
struct fscache_cookie fscache_fsdef_index = {
.usage = ATOMIC_INIT(1),
.lock = __SPIN_LOCK_UNLOCKED(fscache_fsdef_index.lock),
.backing_objects = HLIST_HEAD_INIT,
.def = &fscache_fsdef_index_def,
};
EXPORT_SYMBOL(fscache_fsdef_index);
struct fscache_cookie_def fscache_fsdef_netfs_def = {
.name = "FSDEF.netfs",
.type = FSCACHE_COOKIE_TYPE_INDEX,
.get_key = fscache_fsdef_netfs_get_key,
.get_aux = fscache_fsdef_netfs_get_aux,
.check_aux = fscache_fsdef_netfs_check_aux,
};
static uint16_t fscache_fsdef_netfs_get_key(const void *cookie_netfs_data,
void *buffer, uint16_t bufmax)
{
const struct fscache_netfs *netfs = cookie_netfs_data;
unsigned klen;
_enter("{%s.%u},", netfs->name, netfs->version);
klen = strlen(netfs->name);
if (klen > bufmax)
return 0;
memcpy(buffer, netfs->name, klen);
return klen;
}
static uint16_t fscache_fsdef_netfs_get_aux(const void *cookie_netfs_data,
void *buffer, uint16_t bufmax)
{
const struct fscache_netfs *netfs = cookie_netfs_data;
unsigned dlen;
_enter("{%s.%u},", netfs->name, netfs->version);
dlen = sizeof(uint32_t);
if (dlen > bufmax)
return 0;
memcpy(buffer, &netfs->version, dlen);
return dlen;
}
static enum fscache_checkaux fscache_fsdef_netfs_check_aux(
void *cookie_netfs_data,
const void *data,
uint16_t datalen)
{
struct fscache_netfs *netfs = cookie_netfs_data;
uint32_t version;
_enter("{%s},,%hu", netfs->name, datalen);
if (datalen != sizeof(version)) {
_leave(" = OBSOLETE [dl=%d v=%zu]", datalen, sizeof(version));
return FSCACHE_CHECKAUX_OBSOLETE;
}
memcpy(&version, data, sizeof(version));
if (version != netfs->version) {
_leave(" = OBSOLETE [ver=%x net=%x]", version, netfs->version);
return FSCACHE_CHECKAUX_OBSOLETE;
}
_leave(" = OKAY");
return FSCACHE_CHECKAUX_OKAY;
}
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