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fuse: no fc->lock in request_end()

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No longer need to call request_end() with the connection lock held.  We
still protect the background counters and queue with fc->lock, so acquire
it if necessary.

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 16:26:07 +02:00
parent 1e6881c36e
commit efe2800fac
1 changed files with 8 additions and 7 deletions
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15
fs/fuse/dev.c
View file

@ -376,18 +376,13 @@ static void flush_bg_queue(struct fuse_conn *fc)
* was closed. The requester thread is woken up (if still waiting),
* the 'end' callback is called if given, else the reference to the
* request is released
*
* Called with fc->lock, unlocks it
*/
static void request_end(struct fuse_conn *fc, struct fuse_req *req)
__releases(fc->lock)
{
struct fuse_iqueue *fiq = &fc->iq;
if (test_and_set_bit(FR_FINISHED, &req->flags)) {
spin_unlock(&fc->lock);
if (test_and_set_bit(FR_FINISHED, &req->flags))
return;
}
spin_lock(&fiq->waitq.lock);
list_del_init(&req->intr_entry);
@ -395,6 +390,7 @@ __releases(fc->lock)
WARN_ON(test_bit(FR_PENDING, &req->flags));
WARN_ON(test_bit(FR_SENT, &req->flags));
if (test_bit(FR_BACKGROUND, &req->flags)) {
spin_lock(&fc->lock);
clear_bit(FR_BACKGROUND, &req->flags);
if (fc->num_background == fc->max_background)
fc->blocked = 0;
@ -411,8 +407,8 @@ __releases(fc->lock)
fc->num_background--;
fc->active_background--;
flush_bg_queue(fc);
spin_unlock(&fc->lock);
}
spin_unlock(&fc->lock);
wake_up(&req->waitq);
if (req->end)
req->end(fc, req);
@ -1290,6 +1286,7 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
/* SETXATTR is special, since it may contain too large data */
if (in->h.opcode == FUSE_SETXATTR)
req->out.h.error = -E2BIG;
spin_unlock(&fc->lock);
request_end(fc, req);
goto restart;
}
@ -1333,6 +1330,7 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
if (!test_bit(FR_PRIVATE, &req->flags))
list_del_init(&req->list);
spin_unlock(&fpq->lock);
spin_unlock(&fc->lock);
request_end(fc, req);
return err;
@ -1951,6 +1949,7 @@ static ssize_t fuse_dev_do_write(struct fuse_conn *fc,
if (!test_bit(FR_PRIVATE, &req->flags))
list_del_init(&req->list);
spin_unlock(&fpq->lock);
spin_unlock(&fc->lock);
request_end(fc, req);
return err ? err : nbytes;
@ -2095,6 +2094,7 @@ __acquires(fc->lock)
clear_bit(FR_PENDING, &req->flags);
clear_bit(FR_SENT, &req->flags);
list_del_init(&req->list);
spin_unlock(&fc->lock);
request_end(fc, req);
spin_lock(&fc->lock);
}
@ -2177,6 +2177,7 @@ void fuse_abort_conn(struct fuse_conn *fc)
req = list_first_entry(&to_end1, struct fuse_req, list);
__fuse_get_request(req);
list_del_init(&req->list);
spin_unlock(&fc->lock);
request_end(fc, req);
spin_lock(&fc->lock);
}