/* * initialise the fs caching module */ static int __init fscache_init(void) { int ret; mark_tech_preview(NULL, THIS_MODULE); ret = slow_work_register_user(THIS_MODULE); if (ret < 0) goto error_slow_work; ret = fscache_proc_init(); if (ret < 0) goto error_proc; fscache_cookie_jar = kmem_cache_create("fscache_cookie_jar", sizeof(struct fscache_cookie), 0, 0, fscache_cookie_init_once); if (!fscache_cookie_jar) { printk(KERN_NOTICE "FS-Cache: Failed to allocate a cookie jar\n"); ret = -ENOMEM; goto error_cookie_jar; } fscache_root = kobject_create_and_add("fscache", kernel_kobj); if (!fscache_root) goto error_kobj; printk(KERN_NOTICE "FS-Cache: Loaded\n"); return 0; error_kobj: kmem_cache_destroy(fscache_cookie_jar); error_cookie_jar: fscache_proc_cleanup(); error_proc: slow_work_unregister_user(THIS_MODULE); error_slow_work: return ret; }
/* * initialise the fs caching module */ 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); 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)); 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, fscache_cookie_init_once); if (!fscache_cookie_jar) { printk(KERN_NOTICE "FS-Cache: Failed to allocate a cookie jar\n"); ret = -ENOMEM; goto error_cookie_jar; } fscache_root = kobject_create_and_add("fscache", kernel_kobj); if (!fscache_root) goto error_kobj; printk(KERN_NOTICE "FS-Cache: 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: return ret; }