From: Jeffle Xu <jefflexu@linux.alibaba.com> anolis inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IB5UKT Reference: https://gitee.com/anolis/cloud-kernel/commit/301da8953886 -------------------------------- ANBZ: #1666 commit 4e4f1788af0e477bca079e5b1ffc42846b3bafee upstream. 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> Signed-off-by: Huang Jianan <jnhuang@linux.alibaba.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com> Signed-off-by: Baokun Li <libaokun1@huawei.com> --- fs/cachefiles/bind.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c index 3b39552c2365..c149d5037cc1 100644 --- a/fs/cachefiles/bind.c +++ b/fs/cachefiles/bind.c @@ -46,11 +46,6 @@ int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args) cache->bcull_percent < cache->brun_percent && cache->brun_percent < 100); - 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; @@ -62,6 +57,18 @@ 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 and dirname strings */ if (!cache->tag) { /* the tag string is released by the fops->release() -- 2.46.1