| 1 | |
| 2 | |
| 3 | * filesystem
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| 4 | *
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| 5 | * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
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| 6 | * Written by David Howells ([email protected])
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| 7 |
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| 8 |
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| 9 | #include <linux/module.h>
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| 10 | #include <linux/init.h>
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| 11 | #include <linux/sched.h>
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| 12 | #include <linux/completion.h>
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| 13 | #include <linux/slab.h>
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| 14 | #include <linux/fs.h>
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| 15 | #include <linux/file.h>
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| 16 | #include <linux/namei.h>
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| 17 | #include <linux/mount.h>
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| 18 | #include <linux/statfs.h>
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| 19 | #include <linux/sysctl.h>
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| 20 | #include <linux/miscdevice.h>
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| 21 | #include <linux/netfs.h>
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| 22 | #include <trace/events/netfs.h>
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| 23 | #define CREATE_TRACE_POINTS
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| 24 | #include "internal.h"
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| 25 |
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| 26 | unsigned cachefiles_debug;
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| 27 | module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
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| 28 | MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
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| 29 |
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| 30 | MODULE_DESCRIPTION("Mounted-filesystem based cache");
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| 31 | MODULE_AUTHOR("Red Hat, Inc.");
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| 32 | MODULE_LICENSE("GPL");
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| 33 |
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| 34 | struct kmem_cache *cachefiles_object_jar;
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| 35 |
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| 36 | static struct miscdevice cachefiles_dev = {
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| 37 | .minor = MISC_DYNAMIC_MINOR,
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| 38 | .name = "cachefiles",
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| 39 | .fops = &cachefiles_daemon_fops,
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| 40 | };
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| 41 |
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| 42 | |
| 43 | * initialise the fs caching module
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| 44 |
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| 45 | static int __init cachefiles_init(void)
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| 46 | {
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| 47 | int ret;
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| 48 |
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| 49 | ret = cachefiles_register_error_injection();
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| 50 | if (ret < 0)
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| 51 | goto error_einj;
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| 52 | ret = misc_register(&cachefiles_dev);
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| 53 | if (ret < 0)
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| 54 | goto error_dev;
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| 55 |
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| 56 |
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| 57 | ret = -ENOMEM;
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| 58 | cachefiles_object_jar =
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| 59 | kmem_cache_create("cachefiles_object_jar",
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| 60 | sizeof(struct cachefiles_object),
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| 61 | 0, SLAB_HWCACHE_ALIGN, NULL);
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| 62 | if (!cachefiles_object_jar) {
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| 63 | pr_notice("Failed to allocate an object jar\n");
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| 64 | goto error_object_jar;
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| 65 | }
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| 66 |
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| 67 | pr_info("Loaded\n");
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| 68 | return 0;
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| 69 |
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| 70 | error_object_jar:
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| 71 | misc_deregister(&cachefiles_dev);
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| 72 | error_dev:
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| 73 | cachefiles_unregister_error_injection();
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| 74 | error_einj:
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| 75 | pr_err("failed to register: %d\n", ret);
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| 76 | return ret;
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| 77 | }
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| 78 |
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| 79 | fs_initcall(cachefiles_init);
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| 80 |
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| 81 | |
| 82 | * clean up on module removal
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| 83 |
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| 84 | static void __exit cachefiles_exit(void)
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| 85 | {
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| 86 | pr_info("Unloading\n");
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| 87 |
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| 88 | kmem_cache_destroy(cachefiles_object_jar);
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| 89 | misc_deregister(&cachefiles_dev);
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| 90 | cachefiles_unregister_error_injection();
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| 91 | }
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| 92 |
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| 93 | module_exit(cachefiles_exit);
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