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mm/zswap: replace zswap_init_{started/failed} with zswap_init_state 

The zswap_init_started variable name has a bit confusing.  Actually, there
are three state: uninitialized, initial failed and initial succeed.  Add a
new variable zswap_init_state to replace zswap_init_{started/failed}.

Link: https://lkml.kernel.org/r/20230403121318.1876082-3-liushixin2@huawei.com
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liu Shixin 2023-04-03 20:13:17 +08:00 committed by Andrew Morton
parent b791912252
commit 9021ccec60
1 changed files with 30 additions and 25 deletions
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55
mm/zswap.c
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@ -214,11 +214,13 @@ static DEFINE_SPINLOCK(zswap_pools_lock);
/* pool counter to provide unique names to zpool */
static atomic_t zswap_pools_count = ATOMIC_INIT(0);
/* used by param callback function */
static bool zswap_init_started;
enum zswap_init_type {
ZSWAP_UNINIT,
ZSWAP_INIT_SUCCEED,
ZSWAP_INIT_FAILED
};
/* fatal error during init */
static bool zswap_init_failed;
static enum zswap_init_type zswap_init_state;
/* init completed, but couldn't create the initial pool */
static bool zswap_has_pool;
@ -761,21 +763,22 @@ static int __zswap_param_set(const char *val, const struct kernel_param *kp,
char *s = strstrip((char *)val);
int ret;
if (zswap_init_failed) {
switch (zswap_init_state) {
case ZSWAP_UNINIT:
/* if this is load-time (pre-init) param setting,
* don't create a pool; that's done during init.
*/
return param_set_charp(s, kp);
case ZSWAP_INIT_SUCCEED:
/* no change required */
if (!strcmp(s, *(char **)kp->arg) && zswap_has_pool)
return 0;
break;
case ZSWAP_INIT_FAILED:
pr_err("can't set param, initialization failed\n");
return -ENODEV;
}
/* no change required */
if (!strcmp(s, *(char **)kp->arg) && zswap_has_pool)
return 0;
/* if this is load-time (pre-init) param setting,
* don't create a pool; that's done during init.
*/
if (!zswap_init_started)
return param_set_charp(s, kp);
if (!type) {
if (!zpool_has_pool(s)) {
pr_err("zpool %s not available\n", s);
@ -864,16 +867,19 @@ static int zswap_zpool_param_set(const char *val,
static int zswap_enabled_param_set(const char *val,
const struct kernel_param *kp)
{
if (zswap_init_failed) {
switch (zswap_init_state) {
case ZSWAP_UNINIT:
return param_set_bool(val, kp);
case ZSWAP_INIT_SUCCEED:
if (!zswap_has_pool) {
pr_err("can't enable, no pool configured\n");
return -ENODEV;
} else
return param_set_bool(val, kp);
case ZSWAP_INIT_FAILED:
pr_err("can't enable, initialization failed\n");
return -ENODEV;
}
if (!zswap_has_pool && zswap_init_started) {
pr_err("can't enable, no pool configured\n");
return -ENODEV;
}
return param_set_bool(val, kp);
}
/*********************************
@ -1476,8 +1482,6 @@ static int __init init_zswap(void)
struct zswap_pool *pool;
int ret;
zswap_init_started = true;
zswap_entry_cache = KMEM_CACHE(zswap_entry, 0);
if (!zswap_entry_cache) {
pr_err("entry cache creation failed\n");
@ -1518,6 +1522,7 @@ static int __init init_zswap(void)
goto destroy_wq;
if (zswap_debugfs_init())
pr_warn("debugfs initialization failed\n");
zswap_init_state = ZSWAP_INIT_SUCCEED;
return 0;
destroy_wq:
@ -1531,7 +1536,7 @@ dstmem_fail:
kmem_cache_destroy(zswap_entry_cache);
cache_fail:
/* if built-in, we aren't unloaded on failure; don't allow use */
zswap_init_failed = true;
zswap_init_state = ZSWAP_INIT_FAILED;
zswap_enabled = false;
return -ENOMEM;
}