1 files changed, 0 insertions, 355 deletions
diff --git a/mm/zpool.c b/mm/zpool.c
deleted file mode 100644
index b9fda1fa857d..000000000000
--- a/mm/zpool.c
+++ /dev/null
@@ -1,355 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * zpool memory storage api
- *
- * Copyright (C) 2014 Dan Streetman
- *
- * This is a common frontend for memory storage pool implementations.
- * Typically, this is used to store compressed memory.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/list.h>
-#include <linux/types.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/module.h>
-#include <linux/zpool.h>
-
-struct zpool {
-	struct zpool_driver *driver;
-	void *pool;
-};
-
-static LIST_HEAD(drivers_head);
-static DEFINE_SPINLOCK(drivers_lock);
-
-/**
- * zpool_register_driver() - register a zpool implementation.
- * @driver:	driver to register
- */
-void zpool_register_driver(struct zpool_driver *driver)
-{
-	spin_lock(&drivers_lock);
-	atomic_set(&driver->refcount, 0);
-	list_add(&driver->list, &drivers_head);
-	spin_unlock(&drivers_lock);
-}
-EXPORT_SYMBOL(zpool_register_driver);
-
-/**
- * zpool_unregister_driver() - unregister a zpool implementation.
- * @driver:	driver to unregister.
- *
- * Module usage counting is used to prevent using a driver
- * while/after unloading, so if this is called from module
- * exit function, this should never fail; if called from
- * other than the module exit function, and this returns
- * failure, the driver is in use and must remain available.
- */
-int zpool_unregister_driver(struct zpool_driver *driver)
-{
-	int ret = 0, refcount;
-
-	spin_lock(&drivers_lock);
-	refcount = atomic_read(&driver->refcount);
-	WARN_ON(refcount < 0);
-	if (refcount > 0)
-		ret = -EBUSY;
-	else
-		list_del(&driver->list);
-	spin_unlock(&drivers_lock);
-
-	return ret;
-}
-EXPORT_SYMBOL(zpool_unregister_driver);
-
-/* this assumes @type is null-terminated. */
-static struct zpool_driver *zpool_get_driver(const char *type)
-{
-	struct zpool_driver *driver;
-
-	spin_lock(&drivers_lock);
-	list_for_each_entry(driver, &drivers_head, list) {
-		if (!strcmp(driver->type, type)) {
-			bool got = try_module_get(driver->owner);
-
-			if (got)
-				atomic_inc(&driver->refcount);
-			spin_unlock(&drivers_lock);
-			return got ? driver : NULL;
-		}
-	}
-
-	spin_unlock(&drivers_lock);
-	return NULL;
-}
-
-static void zpool_put_driver(struct zpool_driver *driver)
-{
-	atomic_dec(&driver->refcount);
-	module_put(driver->owner);
-}
-
-/**
- * zpool_has_pool() - Check if the pool driver is available
- * @type:	The type of the zpool to check (e.g. zbud, zsmalloc)
- *
- * This checks if the @type pool driver is available.  This will try to load
- * the requested module, if needed, but there is no guarantee the module will
- * still be loaded and available immediately after calling.  If this returns
- * true, the caller should assume the pool is available, but must be prepared
- * to handle the @zpool_create_pool() returning failure.  However if this
- * returns false, the caller should assume the requested pool type is not
- * available; either the requested pool type module does not exist, or could
- * not be loaded, and calling @zpool_create_pool() with the pool type will
- * fail.
- *
- * The @type string must be null-terminated.
- *
- * Returns: true if @type pool is available, false if not
- */
-bool zpool_has_pool(char *type)
-{
-	struct zpool_driver *driver = zpool_get_driver(type);
-
-	if (!driver) {
-		request_module("zpool-%s", type);
-		driver = zpool_get_driver(type);
-	}
-
-	if (!driver)
-		return false;
-
-	zpool_put_driver(driver);
-	return true;
-}
-EXPORT_SYMBOL(zpool_has_pool);
-
-/**
- * zpool_create_pool() - Create a new zpool
- * @type:	The type of the zpool to create (e.g. zbud, zsmalloc)
- * @name:	The name of the zpool (e.g. zram0, zswap)
- * @gfp:	The GFP flags to use when allocating the pool.
- *
- * This creates a new zpool of the specified type.  The gfp flags will be
- * used when allocating memory, if the implementation supports it.  If the
- * ops param is NULL, then the created zpool will not be evictable.
- *
- * Implementations must guarantee this to be thread-safe.
- *
- * The @type and @name strings must be null-terminated.
- *
- * Returns: New zpool on success, NULL on failure.
- */
-struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp)
-{
-	struct zpool_driver *driver;
-	struct zpool *zpool;
-
-	pr_debug("creating pool type %s\n", type);
-
-	driver = zpool_get_driver(type);
-
-	if (!driver) {
-		request_module("zpool-%s", type);
-		driver = zpool_get_driver(type);
-	}
-
-	if (!driver) {
-		pr_err("no driver for type %s\n", type);
-		return NULL;
-	}
-
-	zpool = kmalloc(sizeof(*zpool), gfp);
-	if (!zpool) {
-		pr_err("couldn't create zpool - out of memory\n");
-		zpool_put_driver(driver);
-		return NULL;
-	}
-
-	zpool->driver = driver;
-	zpool->pool = driver->create(name, gfp);
-
-	if (!zpool->pool) {
-		pr_err("couldn't create %s pool\n", type);
-		zpool_put_driver(driver);
-		kfree(zpool);
-		return NULL;
-	}
-
-	pr_debug("created pool type %s\n", type);
-
-	return zpool;
-}
-
-/**
- * zpool_destroy_pool() - Destroy a zpool
- * @zpool:	The zpool to destroy.
- *
- * Implementations must guarantee this to be thread-safe,
- * however only when destroying different pools.  The same
- * pool should only be destroyed once, and should not be used
- * after it is destroyed.
- *
- * This destroys an existing zpool.  The zpool should not be in use.
- */
-void zpool_destroy_pool(struct zpool *zpool)
-{
-	pr_debug("destroying pool type %s\n", zpool->driver->type);
-
-	zpool->driver->destroy(zpool->pool);
-	zpool_put_driver(zpool->driver);
-	kfree(zpool);
-}
-
-/**
- * zpool_get_type() - Get the type of the zpool
- * @zpool:	The zpool to check
- *
- * This returns the type of the pool.
- *
- * Implementations must guarantee this to be thread-safe.
- *
- * Returns: The type of zpool.
- */
-const char *zpool_get_type(struct zpool *zpool)
-{
-	return zpool->driver->type;
-}
-
-/**
- * zpool_malloc_support_movable() - Check if the zpool supports
- *	allocating movable memory
- * @zpool:	The zpool to check
- *
- * This returns if the zpool supports allocating movable memory.
- *
- * Implementations must guarantee this to be thread-safe.
- *
- * Returns: true if the zpool supports allocating movable memory, false if not
- */
-bool zpool_malloc_support_movable(struct zpool *zpool)
-{
-	return zpool->driver->malloc_support_movable;
-}
-
-/**
- * zpool_malloc() - Allocate memory
- * @zpool:	The zpool to allocate from.
- * @size:	The amount of memory to allocate.
- * @gfp:	The GFP flags to use when allocating memory.
- * @handle:	Pointer to the handle to set
- *
- * This allocates the requested amount of memory from the pool.
- * The gfp flags will be used when allocating memory, if the
- * implementation supports it.  The provided @handle will be
- * set to the allocated object handle.
- *
- * Implementations must guarantee this to be thread-safe.
- *
- * Returns: 0 on success, negative value on error.
- */
-int zpool_malloc(struct zpool *zpool, size_t size, gfp_t gfp,
-			unsigned long *handle)
-{
-	return zpool->driver->malloc(zpool->pool, size, gfp, handle);
-}
-
-/**
- * zpool_free() - Free previously allocated memory
- * @zpool:	The zpool that allocated the memory.
- * @handle:	The handle to the memory to free.
- *
- * This frees previously allocated memory.  This does not guarantee
- * that the pool will actually free memory, only that the memory
- * in the pool will become available for use by the pool.
- *
- * Implementations must guarantee this to be thread-safe,
- * however only when freeing different handles.  The same
- * handle should only be freed once, and should not be used
- * after freeing.
- */
-void zpool_free(struct zpool *zpool, unsigned long handle)
-{
-	zpool->driver->free(zpool->pool, handle);
-}
-
-/**
- * zpool_map_handle() - Map a previously allocated handle into memory
- * @zpool:	The zpool that the handle was allocated from
- * @handle:	The handle to map
- * @mapmode:	How the memory should be mapped
- *
- * This maps a previously allocated handle into memory.  The @mapmode
- * param indicates to the implementation how the memory will be
- * used, i.e. read-only, write-only, read-write.  If the
- * implementation does not support it, the memory will be treated
- * as read-write.
- *
- * This may hold locks, disable interrupts, and/or preemption,
- * and the zpool_unmap_handle() must be called to undo those
- * actions.  The code that uses the mapped handle should complete
- * its operations on the mapped handle memory quickly and unmap
- * as soon as possible.  As the implementation may use per-cpu
- * data, multiple handles should not be mapped concurrently on
- * any cpu.
- *
- * Returns: A pointer to the handle's mapped memory area.
- */
-void *zpool_map_handle(struct zpool *zpool, unsigned long handle,
-			enum zpool_mapmode mapmode)
-{
-	return zpool->driver->map(zpool->pool, handle, mapmode);
-}
-
-/**
- * zpool_unmap_handle() - Unmap a previously mapped handle
- * @zpool:	The zpool that the handle was allocated from
- * @handle:	The handle to unmap
- *
- * This unmaps a previously mapped handle.  Any locks or other
- * actions that the implementation took in zpool_map_handle()
- * will be undone here.  The memory area returned from
- * zpool_map_handle() should no longer be used after this.
- */
-void zpool_unmap_handle(struct zpool *zpool, unsigned long handle)
-{
-	zpool->driver->unmap(zpool->pool, handle);
-}
-
-/**
- * zpool_get_total_pages() - The total size of the pool
- * @zpool:	The zpool to check
- *
- * This returns the total size in pages of the pool.
- *
- * Returns: Total size of the zpool in pages.
- */
-u64 zpool_get_total_pages(struct zpool *zpool)
-{
-	return zpool->driver->total_pages(zpool->pool);
-}
-
-/**
- * zpool_can_sleep_mapped - Test if zpool can sleep when do mapped.
- * @zpool:	The zpool to test
- *
- * Some allocators enter non-preemptible context in ->map() callback (e.g.
- * disable pagefaults) and exit that context in ->unmap(), which limits what
- * we can do with the mapped object. For instance, we cannot wait for
- * asynchronous crypto API to decompress such an object or take mutexes
- * since those will call into the scheduler. This function tells us whether
- * we use such an allocator.
- *
- * Returns: true if zpool can sleep; false otherwise.
- */
-bool zpool_can_sleep_mapped(struct zpool *zpool)
-{
-	return zpool->driver->sleep_mapped;
-}
-
-MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
-MODULE_DESCRIPTION("Common API for compressed memory storage");