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cachefiles: enable on-demand read mode

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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: Jeffle Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220509074028.74954-7-jefflexu@linux.alibaba.com
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Jeffle Xu 2022-04-25 20:21:28 +08:00 committed by Gao Xiang
parent 9032b6e858
commit 4e4f1788af
1 changed files with 12 additions and 5 deletions
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17
fs/cachefiles/daemon.c
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@ -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) {
/*