Commit 4e4f1788 authored by Jeffle Xu's avatar Jeffle Xu Committed by Gao Xiang
Browse files

cachefiles: enable on-demand read mode 



Enable on-demand read mode by adding an optional parameter to the "bind"
command.

On-demand mode will be turned on when this parameter is "ondemand", i.e.
"bind ondemand". Otherwise cachefiles will work in the original mode.

Signed-off-by: default avatarJeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-7-jefflexu@linux.alibaba.com


Acked-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
parent 9032b6e8

fs/cachefiles/daemon.c

+12 −5
Original line number Diff line number Diff line
@@ -755,11 +755,6 @@ static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args) 
	    cache->brun_percent  >= 100)

		return -ERANGE;



	if (*args) {

		pr_err("'bind' command doesn't take an argument\n");

		return -EINVAL;

	}



	if (!cache->rootdirname) {

		pr_err("No cache directory specified\n");

		return -EINVAL;
@@ -771,6 +766,18 @@ static int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args) 
		return -EBUSY;

	}



	if (IS_ENABLED(CONFIG_CACHEFILES_ONDEMAND)) {

		if (!strcmp(args, "ondemand")) {

			set_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags);

		} else if (*args) {

			pr_err("Invalid argument to the 'bind' command\n");

			return -EINVAL;

		}

	} else if (*args) {

		pr_err("'bind' command doesn't take an argument\n");

		return -EINVAL;

	}



	/* Make sure we have copies of the tag string */

	if (!cache->tag) {

		/*