^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Network filesystem caching backend to use cache files on a premounted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * filesystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/statfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/sysctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define CREATE_TRACE_POINTS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned cachefiles_debug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) MODULE_DESCRIPTION("Mounted-filesystem based cache");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) MODULE_AUTHOR("Red Hat, Inc.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct kmem_cache *cachefiles_object_jar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static struct miscdevice cachefiles_dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) .minor = MISC_DYNAMIC_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) .name = "cachefiles",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) .fops = &cachefiles_daemon_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static void cachefiles_object_init_once(void *_object)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct cachefiles_object *object = _object;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) memset(object, 0, sizeof(*object));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) spin_lock_init(&object->work_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * initialise the fs caching module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static int __init cachefiles_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ret = misc_register(&cachefiles_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) goto error_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* create an object jar */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) cachefiles_object_jar =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) kmem_cache_create("cachefiles_object_jar",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) sizeof(struct cachefiles_object),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) SLAB_HWCACHE_ALIGN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) cachefiles_object_init_once);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (!cachefiles_object_jar) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) pr_notice("Failed to allocate an object jar\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) goto error_object_jar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) ret = cachefiles_proc_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) goto error_proc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) pr_info("Loaded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) error_proc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) kmem_cache_destroy(cachefiles_object_jar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) error_object_jar:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) misc_deregister(&cachefiles_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) error_dev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pr_err("failed to register: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) fs_initcall(cachefiles_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * clean up on module removal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static void __exit cachefiles_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pr_info("Unloading\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) cachefiles_proc_cleanup();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) kmem_cache_destroy(cachefiles_object_jar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) misc_deregister(&cachefiles_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) module_exit(cachefiles_exit);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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