fuse: rework abort
Splice fc->pending and fc->processing lists into a common kill list while holding fc->lock. By the time we release fc->lock, pending and processing lists are empty and the io list contains only locked requests. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reviewed-by: Ashish Samant <ashish.samant@oracle.com>
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@ -2101,9 +2101,6 @@ static void end_polls(struct fuse_conn *fc)
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* asynchronous request and the tricky deadlock (see
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* Documentation/filesystems/fuse.txt).
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*
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* Request progression from one list to the next is prevented by fc->connected
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* being false.
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*
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* Aborting requests under I/O goes as follows: 1: Separate out unlocked
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* requests, they should be finished off immediately. Locked requests will be
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* finished after unlock; see unlock_request(). 2: Finish off the unlocked
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@ -2116,7 +2113,8 @@ void fuse_abort_conn(struct fuse_conn *fc)
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spin_lock(&fc->lock);
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if (fc->connected) {
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struct fuse_req *req, *next;
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LIST_HEAD(to_end);
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LIST_HEAD(to_end1);
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LIST_HEAD(to_end2);
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fc->connected = 0;
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fc->blocked = 0;
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@ -2126,19 +2124,20 @@ void fuse_abort_conn(struct fuse_conn *fc)
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spin_lock(&req->waitq.lock);
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set_bit(FR_ABORTED, &req->flags);
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if (!test_bit(FR_LOCKED, &req->flags))
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list_move(&req->list, &to_end);
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list_move(&req->list, &to_end1);
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spin_unlock(&req->waitq.lock);
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}
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while (!list_empty(&to_end)) {
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req = list_first_entry(&to_end, struct fuse_req, list);
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fc->max_background = UINT_MAX;
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flush_bg_queue(fc);
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list_splice_init(&fc->pending, &to_end2);
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list_splice_init(&fc->processing, &to_end2);
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while (!list_empty(&to_end1)) {
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req = list_first_entry(&to_end1, struct fuse_req, list);
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__fuse_get_request(req);
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request_end(fc, req);
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spin_lock(&fc->lock);
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}
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fc->max_background = UINT_MAX;
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flush_bg_queue(fc);
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end_requests(fc, &fc->pending);
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end_requests(fc, &fc->processing);
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end_requests(fc, &to_end2);
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while (forget_pending(fc))
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kfree(dequeue_forget(fc, 1, NULL));
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end_polls(fc);
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