diff options
| author | David Howells <dhowells@redhat.com> | 2021-11-26 15:12:07 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-01-07 13:41:20 +0000 |
| commit | 8667d434b2a993b34a9dae6f6673bf93870fac25 (patch) | |
| tree | 197a555cb4364c72eddbdb4bf5afa37013d0fea6 /fs/cachefiles/main.c | |
| parent | 254947d47945f2fa02e9b3366594fad2ed127618 (diff) | |
cachefiles: Register a miscdev and parse commands over it
Register a misc device with which to talk to the daemon. The misc device
holds a cache set up through it around and closing the device kills the
cache.
cachefilesd communicates with the kernel by passing it single-line text
commands. Parse these and use them to parameterise the cache state. This
does not implement the command to actually bring a cache online. That's
left for later.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819628388.215744.17712097043607299608.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906929128.143852.14065207858943654011.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967139085.1823006.3514846391807454287.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021538400.640689.9172006906288062041.stgit@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'fs/cachefiles/main.c')
| -rw-r--r-- | fs/cachefiles/main.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c index 387d42c7185f..533e3067d80f 100644 --- a/fs/cachefiles/main.c +++ b/fs/cachefiles/main.c @@ -31,6 +31,12 @@ MODULE_DESCRIPTION("Mounted-filesystem based cache"); MODULE_AUTHOR("Red Hat, Inc."); MODULE_LICENSE("GPL"); +static struct miscdevice cachefiles_dev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "cachefiles", + .fops = &cachefiles_daemon_fops, +}; + /* * initialise the fs caching module */ @@ -41,10 +47,15 @@ static int __init cachefiles_init(void) ret = cachefiles_register_error_injection(); if (ret < 0) goto error_einj; + ret = misc_register(&cachefiles_dev); + if (ret < 0) + goto error_dev; pr_info("Loaded\n"); return 0; +error_dev: + cachefiles_unregister_error_injection(); error_einj: pr_err("failed to register: %d\n", ret); return ret; @@ -59,6 +70,7 @@ static void __exit cachefiles_exit(void) { pr_info("Unloading\n"); + misc_deregister(&cachefiles_dev); cachefiles_unregister_error_injection(); } |