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-rw-r--r--fs/fscache/main.c147
1 files changed, 19 insertions, 128 deletions
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index 4207f98e405f..dad85fd84f6f 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -1,17 +1,13 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/* General filesystem local caching manager
*
- * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#define FSCACHE_DEBUG_LEVEL CACHE
#include <linux/module.h>
#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/slab.h>
-#include <linux/seq_file.h>
#define CREATE_TRACE_POINTS
#include "internal.h"
@@ -19,79 +15,18 @@ MODULE_DESCRIPTION("FS Cache Manager");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
-unsigned fscache_defer_lookup = 1;
-module_param_named(defer_lookup, fscache_defer_lookup, uint,
- S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(fscache_defer_lookup,
- "Defer cookie lookup to background thread");
-
-unsigned fscache_defer_create = 1;
-module_param_named(defer_create, fscache_defer_create, uint,
- S_IWUSR | S_IRUGO);
-MODULE_PARM_DESC(fscache_defer_create,
- "Defer cookie creation to background thread");
-
unsigned fscache_debug;
module_param_named(debug, fscache_debug, uint,
S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(fscache_debug,
"FS-Cache debugging mask");
-struct kobject *fscache_root;
-struct workqueue_struct *fscache_object_wq;
-struct workqueue_struct *fscache_op_wq;
-
-DEFINE_PER_CPU(wait_queue_head_t, fscache_object_cong_wait);
+EXPORT_TRACEPOINT_SYMBOL(fscache_access_cache);
+EXPORT_TRACEPOINT_SYMBOL(fscache_access_volume);
+EXPORT_TRACEPOINT_SYMBOL(fscache_access);
-/* these values serve as lower bounds, will be adjusted in fscache_init() */
-static unsigned fscache_object_max_active = 4;
-static unsigned fscache_op_max_active = 2;
-
-#ifdef CONFIG_SYSCTL
-static struct ctl_table_header *fscache_sysctl_header;
-
-static int fscache_max_active_sysctl(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- struct workqueue_struct **wqp = table->extra1;
- unsigned int *datap = table->data;
- int ret;
-
- ret = proc_dointvec(table, write, buffer, lenp, ppos);
- if (ret == 0)
- workqueue_set_max_active(*wqp, *datap);
- return ret;
-}
-
-static struct ctl_table fscache_sysctls[] = {
- {
- .procname = "object_max_active",
- .data = &fscache_object_max_active,
- .maxlen = sizeof(unsigned),
- .mode = 0644,
- .proc_handler = fscache_max_active_sysctl,
- .extra1 = &fscache_object_wq,
- },
- {
- .procname = "operation_max_active",
- .data = &fscache_op_max_active,
- .maxlen = sizeof(unsigned),
- .mode = 0644,
- .proc_handler = fscache_max_active_sysctl,
- .extra1 = &fscache_op_wq,
- },
- {}
-};
-
-static struct ctl_table fscache_sysctls_root[] = {
- {
- .procname = "fscache",
- .mode = 0555,
- .child = fscache_sysctls,
- },
- {}
-};
-#endif
+struct workqueue_struct *fscache_wq;
+EXPORT_SYMBOL(fscache_wq);
/*
* Mixing scores (in bits) for (7,20):
@@ -118,15 +53,16 @@ static inline unsigned int fold_hash(unsigned long x, unsigned long y)
/*
* Generate a hash. This is derived from full_name_hash(), but we want to be
* sure it is arch independent and that it doesn't change as bits of the
- * computed hash value might appear on disk. The caller also guarantees that
- * the hashed data will be a series of aligned 32-bit words.
+ * computed hash value might appear on disk. The caller must guarantee that
+ * the source data is a multiple of four bytes in size.
*/
-unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n)
+unsigned int fscache_hash(unsigned int salt, const void *data, size_t len)
{
- unsigned int a, x = 0, y = salt;
+ const __le32 *p = data;
+ unsigned int a, x = 0, y = salt, n = len / sizeof(__le32);
for (; n; n--) {
- a = *data++;
+ a = le32_to_cpu(*p++);
HASH_MIX(x, y, a);
}
return fold_hash(x, y);
@@ -137,44 +73,16 @@ unsigned int fscache_hash(unsigned int salt, unsigned int *data, unsigned int n)
*/
static int __init fscache_init(void)
{
- unsigned int nr_cpus = num_possible_cpus();
- unsigned int cpu;
- int ret;
-
- fscache_object_max_active =
- clamp_val(nr_cpus,
- fscache_object_max_active, WQ_UNBOUND_MAX_ACTIVE);
-
- ret = -ENOMEM;
- fscache_object_wq = alloc_workqueue("fscache_object", WQ_UNBOUND,
- fscache_object_max_active);
- if (!fscache_object_wq)
- goto error_object_wq;
-
- fscache_op_max_active =
- clamp_val(fscache_object_max_active / 2,
- fscache_op_max_active, WQ_UNBOUND_MAX_ACTIVE);
+ int ret = -ENOMEM;
- ret = -ENOMEM;
- fscache_op_wq = alloc_workqueue("fscache_operation", WQ_UNBOUND,
- fscache_op_max_active);
- if (!fscache_op_wq)
- goto error_op_wq;
-
- for_each_possible_cpu(cpu)
- init_waitqueue_head(&per_cpu(fscache_object_cong_wait, cpu));
+ fscache_wq = alloc_workqueue("fscache", WQ_UNBOUND | WQ_FREEZABLE, 0);
+ if (!fscache_wq)
+ goto error_wq;
ret = fscache_proc_init();
if (ret < 0)
goto error_proc;
-#ifdef CONFIG_SYSCTL
- ret = -ENOMEM;
- fscache_sysctl_header = register_sysctl_table(fscache_sysctls_root);
- if (!fscache_sysctl_header)
- goto error_sysctl;
-#endif
-
fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar",
sizeof(struct fscache_cookie),
0, 0, NULL);
@@ -184,26 +92,14 @@ static int __init fscache_init(void)
goto error_cookie_jar;
}
- fscache_root = kobject_create_and_add("fscache", kernel_kobj);
- if (!fscache_root)
- goto error_kobj;
-
pr_notice("Loaded\n");
return 0;
-error_kobj:
- kmem_cache_destroy(fscache_cookie_jar);
error_cookie_jar:
-#ifdef CONFIG_SYSCTL
- unregister_sysctl_table(fscache_sysctl_header);
-error_sysctl:
-#endif
fscache_proc_cleanup();
error_proc:
- destroy_workqueue(fscache_op_wq);
-error_op_wq:
- destroy_workqueue(fscache_object_wq);
-error_object_wq:
+ destroy_workqueue(fscache_wq);
+error_wq:
return ret;
}
@@ -216,14 +112,9 @@ static void __exit fscache_exit(void)
{
_enter("");
- kobject_put(fscache_root);
kmem_cache_destroy(fscache_cookie_jar);
-#ifdef CONFIG_SYSCTL
- unregister_sysctl_table(fscache_sysctl_header);
-#endif
fscache_proc_cleanup();
- destroy_workqueue(fscache_op_wq);
- destroy_workqueue(fscache_object_wq);
+ destroy_workqueue(fscache_wq);
pr_notice("Unloaded\n");
}