summaryrefslogtreecommitdiffstats
path: root/fs/cachefiles
diff options
context:
space:
mode:
authorJia Zhu <zhujia.zj@bytedance.com>2023-11-20 05:14:22 +0100
committerChristian Brauner <brauner@kernel.org>2023-11-25 16:03:57 +0100
commite73fa11a356ca0905c3cc648eaacc6f0f2d2c8b3 (patch)
tree43eee30a526dcd025ab72ce1aa8f3dfb09a5d87f /fs/cachefiles
parentcachefiles: narrow the scope of triggering EPOLLIN events in ondemand mode (diff)
downloadlinux-e73fa11a356ca0905c3cc648eaacc6f0f2d2c8b3.tar.xz
linux-e73fa11a356ca0905c3cc648eaacc6f0f2d2c8b3.zip
cachefiles: add restore command to recover inflight ondemand read requests
Previously, in ondemand read scenario, if the anonymous fd was closed by user daemon, inflight and subsequent read requests would return EIO. As long as the device connection is not released, user daemon can hold and restore inflight requests by setting the request flag to CACHEFILES_REQ_NEW. Suggested-by: Gao Xiang <hsiangkao@linux.alibaba.com> Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com> Signed-off-by: Xin Yin <yinxin.x@bytedance.com> Link: https://lore.kernel.org/r/20231120041422.75170-6-zhujia.zj@bytedance.com Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: David Howells <dhowells@redhat.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/cachefiles')
-rw-r--r--fs/cachefiles/daemon.c1
-rw-r--r--fs/cachefiles/internal.h3
-rw-r--r--fs/cachefiles/ondemand.c23
3 files changed, 27 insertions, 0 deletions
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 70caa1946207..3f24905f4066 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -77,6 +77,7 @@ static const struct cachefiles_daemon_cmd cachefiles_daemon_cmds[] = {
{ "tag", cachefiles_daemon_tag },
#ifdef CONFIG_CACHEFILES_ONDEMAND
{ "copen", cachefiles_ondemand_copen },
+ { "restore", cachefiles_ondemand_restore },
#endif
{ "", NULL }
};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 26e5f8f123ef..4a87c9d714a9 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -303,6 +303,9 @@ extern ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
extern int cachefiles_ondemand_copen(struct cachefiles_cache *cache,
char *args);
+extern int cachefiles_ondemand_restore(struct cachefiles_cache *cache,
+ char *args);
+
extern int cachefiles_ondemand_init_object(struct cachefiles_object *object);
extern void cachefiles_ondemand_clean_object(struct cachefiles_object *object);
diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index 8e130de952f7..b8fbbb1961bb 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -182,6 +182,29 @@ out:
return ret;
}
+int cachefiles_ondemand_restore(struct cachefiles_cache *cache, char *args)
+{
+ struct cachefiles_req *req;
+
+ XA_STATE(xas, &cache->reqs, 0);
+
+ if (!test_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags))
+ return -EOPNOTSUPP;
+
+ /*
+ * Reset the requests to CACHEFILES_REQ_NEW state, so that the
+ * requests have been processed halfway before the crash of the
+ * user daemon could be reprocessed after the recovery.
+ */
+ xas_lock(&xas);
+ xas_for_each(&xas, req, ULONG_MAX)
+ xas_set_mark(&xas, CACHEFILES_REQ_NEW);
+ xas_unlock(&xas);
+
+ wake_up_all(&cache->daemon_pollwq);
+ return 0;
+}
+
static int cachefiles_ondemand_get_fd(struct cachefiles_req *req)
{
struct cachefiles_object *object;