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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>
This commit is contained in:
Miklos Szeredi 2015-07-01 16:25:59 +02:00
parent b716d42538
commit 41f982747e
1 changed files with 10 additions and 11 deletions
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21
fs/fuse/dev.c
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@ -2101,9 +2101,6 @@ static void end_polls(struct fuse_conn *fc)
* asynchronous request and the tricky deadlock (see
* Documentation/filesystems/fuse.txt).
*
* Request progression from one list to the next is prevented by fc->connected
* being false.
*
* Aborting requests under I/O goes as follows: 1: Separate out unlocked
* requests, they should be finished off immediately. Locked requests will be
* finished after unlock; see unlock_request(). 2: Finish off the unlocked
@ -2116,7 +2113,8 @@ void fuse_abort_conn(struct fuse_conn *fc)
spin_lock(&fc->lock);
if (fc->connected) {
struct fuse_req *req, *next;
LIST_HEAD(to_end);
LIST_HEAD(to_end1);
LIST_HEAD(to_end2);
fc->connected = 0;
fc->blocked = 0;
@ -2126,19 +2124,20 @@ void fuse_abort_conn(struct fuse_conn *fc)
spin_lock(&req->waitq.lock);
set_bit(FR_ABORTED, &req->flags);
if (!test_bit(FR_LOCKED, &req->flags))
list_move(&req->list, &to_end);
list_move(&req->list, &to_end1);
spin_unlock(&req->waitq.lock);
}
while (!list_empty(&to_end)) {
req = list_first_entry(&to_end, struct fuse_req, list);
fc->max_background = UINT_MAX;
flush_bg_queue(fc);
list_splice_init(&fc->pending, &to_end2);
list_splice_init(&fc->processing, &to_end2);
while (!list_empty(&to_end1)) {
req = list_first_entry(&to_end1, struct fuse_req, list);
__fuse_get_request(req);
request_end(fc, req);
spin_lock(&fc->lock);
}
fc->max_background = UINT_MAX;
flush_bg_queue(fc);
end_requests(fc, &fc->pending);
end_requests(fc, &fc->processing);
end_requests(fc, &to_end2);
while (forget_pending(fc))
kfree(dequeue_forget(fc, 1, NULL));
end_polls(fc);