6.1-stable review patch. If anyone has any objections, please let me know.
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From: Jia Zhu zhujia.zj@bytedance.com
[ Upstream commit b817e22b2e91257ace32a6768c3c003faeaa1c5c ]
Don't trigger EPOLLIN when there are only reopening read requests in xarray.
Suggested-by: Xin Yin yinxin.x@bytedance.com Signed-off-by: Jia Zhu zhujia.zj@bytedance.com Link: https://lore.kernel.org/r/20231120041422.75170-5-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 Stable-dep-of: 12e009d60852 ("cachefiles: wait for ondemand_object_worker to finish when dropping object") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/cachefiles/daemon.c | 14 ++++++++++++-- fs/cachefiles/internal.h | 12 ++++++++++++ 2 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c index b9945e4f697be..06cdf1a8a16f6 100644 --- a/fs/cachefiles/daemon.c +++ b/fs/cachefiles/daemon.c @@ -357,14 +357,24 @@ static __poll_t cachefiles_daemon_poll(struct file *file, struct poll_table_struct *poll) { struct cachefiles_cache *cache = file->private_data; + XA_STATE(xas, &cache->reqs, 0); + struct cachefiles_req *req; __poll_t mask;
poll_wait(file, &cache->daemon_pollwq, poll); mask = 0;
if (cachefiles_in_ondemand_mode(cache)) { - if (!xa_empty(&cache->reqs)) - mask |= EPOLLIN; + if (!xa_empty(&cache->reqs)) { + rcu_read_lock(); + xas_for_each_marked(&xas, req, ULONG_MAX, CACHEFILES_REQ_NEW) { + if (!cachefiles_ondemand_is_reopening_read(req)) { + mask |= EPOLLIN; + break; + } + } + rcu_read_unlock(); + } } else { if (test_bit(CACHEFILES_STATE_CHANGED, &cache->flags)) mask |= EPOLLIN; diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index 3eea52462fc87..e0eac16e4741c 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -335,6 +335,13 @@ cachefiles_ondemand_set_object_##_state(struct cachefiles_object *object) \ CACHEFILES_OBJECT_STATE_FUNCS(open, OPEN); CACHEFILES_OBJECT_STATE_FUNCS(close, CLOSE); CACHEFILES_OBJECT_STATE_FUNCS(reopening, REOPENING); + +static inline bool cachefiles_ondemand_is_reopening_read(struct cachefiles_req *req) +{ + return cachefiles_ondemand_object_is_reopening(req->object) && + req->msg.opcode == CACHEFILES_OP_READ; +} + #else static inline ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache, char __user *_buffer, size_t buflen) @@ -365,6 +372,11 @@ static inline int cachefiles_ondemand_init_obj_info(struct cachefiles_object *ob static inline void cachefiles_ondemand_deinit_obj_info(struct cachefiles_object *obj) { } + +static inline bool cachefiles_ondemand_is_reopening_read(struct cachefiles_req *req) +{ + return false; +} #endif
/*