From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- kernel/mm/zpool.c | 102 +++++++++++++++++++++++++----------------------------- 1 file changed, 48 insertions(+), 54 deletions(-) (limited to 'kernel/mm/zpool.c') diff --git a/kernel/mm/zpool.c b/kernel/mm/zpool.c index bacdab6e4..fd3ff719c 100644 --- a/kernel/mm/zpool.c +++ b/kernel/mm/zpool.c @@ -18,11 +18,9 @@ #include struct zpool { - char *type; - struct zpool_driver *driver; void *pool; - struct zpool_ops *ops; + const struct zpool_ops *ops; struct list_head list; }; @@ -73,34 +71,8 @@ int zpool_unregister_driver(struct zpool_driver *driver) } EXPORT_SYMBOL(zpool_unregister_driver); -/** - * zpool_evict() - evict callback from a zpool implementation. - * @pool: pool to evict from. - * @handle: handle to evict. - * - * This can be used by zpool implementations to call the - * user's evict zpool_ops struct evict callback. - */ -int zpool_evict(void *pool, unsigned long handle) -{ - struct zpool *zpool; - - spin_lock(&pools_lock); - list_for_each_entry(zpool, &pools_head, list) { - if (zpool->pool == pool) { - spin_unlock(&pools_lock); - if (!zpool->ops || !zpool->ops->evict) - return -EINVAL; - return zpool->ops->evict(zpool, handle); - } - } - spin_unlock(&pools_lock); - - return -ENOENT; -} -EXPORT_SYMBOL(zpool_evict); - -static struct zpool_driver *zpool_get_driver(char *type) +/* this assumes @type is null-terminated. */ +static struct zpool_driver *zpool_get_driver(const char *type) { struct zpool_driver *driver; @@ -126,6 +98,41 @@ static void zpool_put_driver(struct zpool_driver *driver) 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) @@ -139,15 +146,17 @@ static void zpool_put_driver(struct zpool_driver *driver) * * 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(char *type, char *name, gfp_t gfp, - struct zpool_ops *ops) +struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp, + const struct zpool_ops *ops) { struct zpool_driver *driver; struct zpool *zpool; - pr_info("creating pool type %s\n", type); + pr_debug("creating pool type %s\n", type); driver = zpool_get_driver(type); @@ -168,9 +177,8 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp, return NULL; } - zpool->type = driver->type; zpool->driver = driver; - zpool->pool = driver->create(name, gfp, ops); + zpool->pool = driver->create(name, gfp, ops, zpool); zpool->ops = ops; if (!zpool->pool) { @@ -180,7 +188,7 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp, return NULL; } - pr_info("created %s pool\n", type); + pr_debug("created pool type %s\n", type); spin_lock(&pools_lock); list_add(&zpool->list, &pools_head); @@ -202,7 +210,7 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp, */ void zpool_destroy_pool(struct zpool *zpool) { - pr_info("destroying pool type %s\n", zpool->type); + pr_debug("destroying pool type %s\n", zpool->driver->type); spin_lock(&pools_lock); list_del(&zpool->list); @@ -222,9 +230,9 @@ void zpool_destroy_pool(struct zpool *zpool) * * Returns: The type of zpool. */ -char *zpool_get_type(struct zpool *zpool) +const char *zpool_get_type(struct zpool *zpool) { - return zpool->type; + return zpool->driver->type; } /** @@ -347,20 +355,6 @@ u64 zpool_get_total_size(struct zpool *zpool) return zpool->driver->total_size(zpool->pool); } -static int __init init_zpool(void) -{ - pr_info("loaded\n"); - return 0; -} - -static void __exit exit_zpool(void) -{ - pr_info("unloaded\n"); -} - -module_init(init_zpool); -module_exit(exit_zpool); - MODULE_LICENSE("GPL"); MODULE_AUTHOR("Dan Streetman "); MODULE_DESCRIPTION("Common API for compressed memory storage"); -- cgit 1.2.3-korg