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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 17:37:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 17:37:43 -0700
commit5f56886521d6ddd3648777fae44d82382dd8c87f (patch)
treeaa0db6331cdb01c23f1884439840aadd31bbcca4 /drivers/staging/zcache/zcache-main.c
parentf1e9a236e5ddab6c349611ee86f54291916f226c (diff)
parente2a8b0a779787314eca1061308a8182e6c5bfabd (diff)
downloadlinux-master.tar.gz
Merge branch 'akpm' (incoming from Andrew)HEADmaster
Merge third batch of fixes from Andrew Morton: "Most of the rest. I still have two large patchsets against AIO and IPC, but they're a bit stuck behind other trees and I'm about to vanish for six days. - random fixlets - inotify - more of the MM queue - show_stack() cleanups - DMI update - kthread/workqueue things - compat cleanups - epoll udpates - binfmt updates - nilfs2 - hfs - hfsplus - ptrace - kmod - coredump - kexec - rbtree - pids - pidns - pps - semaphore tweaks - some w1 patches - relay updates - core Kconfig changes - sysrq tweaks" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (109 commits) Documentation/sysrq: fix inconstistent help message of sysrq key ethernet/emac/sysrq: fix inconstistent help message of sysrq key sparc/sysrq: fix inconstistent help message of sysrq key powerpc/xmon/sysrq: fix inconstistent help message of sysrq key ARM/etm/sysrq: fix inconstistent help message of sysrq key power/sysrq: fix inconstistent help message of sysrq key kgdb/sysrq: fix inconstistent help message of sysrq key lib/decompress.c: fix initconst notifier-error-inject: fix module names in Kconfig kernel/sys.c: make prctl(PR_SET_MM) generally available UAPI: remove empty Kbuild files menuconfig: print more info for symbol without prompts init/Kconfig: re-order CONFIG_EXPERT options to fix menuconfig display kconfig menu: move Virtualization drivers near other virtualization options Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS relay: use macro PAGE_ALIGN instead of FIX_SIZE kernel/relay.c: move FIX_SIZE macro into relay.c kernel/relay.c: remove unused function argument actor drivers/w1/slaves/w1_ds2760.c: fix the error handling in w1_ds2760_add_slave() drivers/w1/slaves/w1_ds2781.c: fix the error handling in w1_ds2781_add_slave() ...
Diffstat (limited to 'drivers/staging/zcache/zcache-main.c')
-rw-r--r--drivers/staging/zcache/zcache-main.c64
1 files changed, 53 insertions, 11 deletions
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index e23d814b539..522cb8e5514 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -37,8 +37,10 @@
#include "debug.h"
#ifdef CONFIG_RAMSTER
static bool ramster_enabled __read_mostly;
+static int disable_frontswap_selfshrink;
#else
#define ramster_enabled false
+#define disable_frontswap_selfshrink 0
#endif
#ifndef __PG_WAS_ACTIVE
@@ -81,8 +83,12 @@ static char *namestr __read_mostly = "zcache";
(__GFP_FS | __GFP_NORETRY | __GFP_NOWARN | __GFP_NOMEMALLOC)
/* crypto API for zcache */
+#ifdef CONFIG_ZCACHE_MODULE
+static char *zcache_comp_name = "lzo";
+#else
#define ZCACHE_COMP_NAME_SZ CRYPTO_MAX_ALG_NAME
static char zcache_comp_name[ZCACHE_COMP_NAME_SZ] __read_mostly;
+#endif
static struct crypto_comp * __percpu *zcache_comp_pcpu_tfms __read_mostly;
enum comp_op {
@@ -1576,9 +1582,9 @@ static struct cleancache_ops zcache_cleancache_ops = {
.init_fs = zcache_cleancache_init_fs
};
-struct cleancache_ops zcache_cleancache_register_ops(void)
+struct cleancache_ops *zcache_cleancache_register_ops(void)
{
- struct cleancache_ops old_ops =
+ struct cleancache_ops *old_ops =
cleancache_register_ops(&zcache_cleancache_ops);
return old_ops;
@@ -1707,9 +1713,9 @@ static struct frontswap_ops zcache_frontswap_ops = {
.init = zcache_frontswap_init
};
-struct frontswap_ops zcache_frontswap_register_ops(void)
+struct frontswap_ops *zcache_frontswap_register_ops(void)
{
- struct frontswap_ops old_ops =
+ struct frontswap_ops *old_ops =
frontswap_register_ops(&zcache_frontswap_ops);
return old_ops;
@@ -1721,6 +1727,7 @@ struct frontswap_ops zcache_frontswap_register_ops(void)
* OR NOTHING HAPPENS!
*/
+#ifndef CONFIG_ZCACHE_MODULE
static int __init enable_zcache(char *s)
{
zcache_enabled = true;
@@ -1787,18 +1794,27 @@ static int __init enable_zcache_compressor(char *s)
return 1;
}
__setup("zcache=", enable_zcache_compressor);
+#endif
-static int __init zcache_comp_init(void)
+static int zcache_comp_init(void)
{
int ret = 0;
/* check crypto algorithm */
+#ifdef CONFIG_ZCACHE_MODULE
+ ret = crypto_has_comp(zcache_comp_name, 0, 0);
+ if (!ret) {
+ ret = -1;
+ goto out;
+ }
+#else
if (*zcache_comp_name != '\0') {
ret = crypto_has_comp(zcache_comp_name, 0, 0);
if (!ret)
pr_info("zcache: %s not supported\n",
zcache_comp_name);
+ goto out;
}
if (!ret)
strcpy(zcache_comp_name, "lzo");
@@ -1807,6 +1823,7 @@ static int __init zcache_comp_init(void)
ret = 1;
goto out;
}
+#endif
pr_info("zcache: using %s compressor\n", zcache_comp_name);
/* alloc percpu transforms */
@@ -1818,10 +1835,13 @@ out:
return ret;
}
-static int __init zcache_init(void)
+static int zcache_init(void)
{
int ret = 0;
+#ifdef CONFIG_ZCACHE_MODULE
+ zcache_enabled = 1;
+#endif
if (ramster_enabled) {
namestr = "ramster";
ramster_register_pamops(&zcache_pamops);
@@ -1860,7 +1880,7 @@ static int __init zcache_init(void)
}
zbud_init();
if (zcache_enabled && !disable_cleancache) {
- struct cleancache_ops old_ops;
+ struct cleancache_ops *old_ops;
register_shrinker(&zcache_shrinker);
old_ops = zcache_cleancache_register_ops();
@@ -1870,11 +1890,11 @@ static int __init zcache_init(void)
pr_info("%s: cleancache: ignorenonactive = %d\n",
namestr, !disable_cleancache_ignore_nonactive);
#endif
- if (old_ops.init_fs != NULL)
+ if (old_ops != NULL)
pr_warn("%s: cleancache_ops overridden\n", namestr);
}
if (zcache_enabled && !disable_frontswap) {
- struct frontswap_ops old_ops;
+ struct frontswap_ops *old_ops;
old_ops = zcache_frontswap_register_ops();
if (frontswap_has_exclusive_gets)
@@ -1886,14 +1906,36 @@ static int __init zcache_init(void)
namestr, frontswap_has_exclusive_gets,
!disable_frontswap_ignore_nonactive);
#endif
- if (old_ops.init != NULL)
+ if (IS_ERR(old_ops) || old_ops) {
+ if (IS_ERR(old_ops))
+ return PTR_RET(old_ops);
pr_warn("%s: frontswap_ops overridden\n", namestr);
+ }
}
if (ramster_enabled)
ramster_init(!disable_cleancache, !disable_frontswap,
- frontswap_has_exclusive_gets);
+ frontswap_has_exclusive_gets,
+ !disable_frontswap_selfshrink);
out:
return ret;
}
+#ifdef CONFIG_ZCACHE_MODULE
+#ifdef CONFIG_RAMSTER
+module_param(ramster_enabled, int, S_IRUGO);
+module_param(disable_frontswap_selfshrink, int, S_IRUGO);
+#endif
+module_param(disable_cleancache, int, S_IRUGO);
+module_param(disable_frontswap, int, S_IRUGO);
+#ifdef FRONTSWAP_HAS_EXCLUSIVE_GETS
+module_param(frontswap_has_exclusive_gets, bool, S_IRUGO);
+#endif
+module_param(disable_frontswap_ignore_nonactive, int, S_IRUGO);
+module_param(zcache_comp_name, charp, S_IRUGO);
+module_init(zcache_init);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Dan Magenheimer <dan.magenheimer@oracle.com>");
+MODULE_DESCRIPTION("In-kernel compression of cleancache/frontswap pages");
+#else
late_initcall(zcache_init);
+#endif