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// SPDX-License-Identifier: GPL-2.0-only
#include "dev.h"
#include "sysctl.h"
#include "fuse_dev_i.h"
#include "dev_uring_i.h"
/* Frequency (in seconds) of request timeout checks, if opted into */
#define FUSE_TIMEOUT_TIMER_FREQ 15
/* Frequency (in jiffies) of request timeout checks, if opted into */
static const unsigned long fuse_timeout_timer_freq =
secs_to_jiffies(FUSE_TIMEOUT_TIMER_FREQ);
/*
* Default timeout (in seconds) for the server to reply to a request
* before the connection is aborted, if no timeout was specified on mount.
*
* Exported via sysctl
*/
unsigned int fuse_default_req_timeout;
/*
* Max timeout (in seconds) for the server to reply to a request before
* the connection is aborted.
*
* Exported via sysctl
*/
unsigned int fuse_max_req_timeout;
bool fuse_request_expired(struct fuse_chan *fch, struct list_head *list)
{
struct fuse_req *req;
req = list_first_entry_or_null(list, struct fuse_req, list);
if (!req)
return false;
return time_is_before_jiffies(req->create_time + fch->timeout.req_timeout);
}
static bool fuse_fpq_processing_expired(struct fuse_chan *fch, struct list_head *processing)
{
int i;
for (i = 0; i < FUSE_PQ_HASH_SIZE; i++)
if (fuse_request_expired(fch, &processing[i]))
return true;
return false;
}
/*
* Check if any requests aren't being completed by the time the request timeout
* elapses. To do so, we:
* - check the fiq pending list
* - check the bg queue
* - check the fpq io and processing lists
*
* To make this fast, we only check against the head request on each list since
* these are generally queued in order of creation time (eg newer requests get
* queued to the tail). We might miss a few edge cases (eg requests transitioning
* between lists, re-sent requests at the head of the pending list having a
* later creation time than other requests on that list, etc.) but that is fine
* since if the request never gets fulfilled, it will eventually be caught.
*/
static void fuse_check_timeout(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct fuse_chan *fch = container_of(dwork, struct fuse_chan, timeout.work);
struct fuse_iqueue *fiq = &fch->iq;
struct fuse_dev *fud;
struct fuse_pqueue *fpq;
bool expired = false;
if (!atomic_read(&fch->num_waiting))
goto out;
spin_lock(&fiq->lock);
expired = fuse_request_expired(fch, &fiq->pending);
spin_unlock(&fiq->lock);
if (expired)
goto chan_abort;
spin_lock(&fch->bg_lock);
expired = fuse_request_expired(fch, &fch->bg_queue);
spin_unlock(&fch->bg_lock);
if (expired)
goto chan_abort;
spin_lock(&fch->lock);
if (!fch->connected) {
spin_unlock(&fch->lock);
return;
}
list_for_each_entry(fud, &fch->devices, entry) {
fpq = &fud->pq;
spin_lock(&fpq->lock);
if (fuse_request_expired(fch, &fpq->io) ||
fuse_fpq_processing_expired(fch, fpq->processing)) {
spin_unlock(&fpq->lock);
spin_unlock(&fch->lock);
goto chan_abort;
}
spin_unlock(&fpq->lock);
}
spin_unlock(&fch->lock);
if (fuse_uring_request_expired(fch))
goto chan_abort;
out:
queue_delayed_work(system_percpu_wq, &fch->timeout.work,
fuse_timeout_timer_freq);
return;
chan_abort:
fuse_chan_abort(fch, false);
}
static void set_request_timeout(struct fuse_chan *fch, unsigned int timeout)
{
fch->timeout.req_timeout = secs_to_jiffies(timeout);
INIT_DELAYED_WORK(&fch->timeout.work, fuse_check_timeout);
queue_delayed_work(system_percpu_wq, &fch->timeout.work,
fuse_timeout_timer_freq);
}
void fuse_init_server_timeout(struct fuse_chan *fch, unsigned int timeout)
{
if (!timeout && !fuse_max_req_timeout && !fuse_default_req_timeout)
return;
if (!timeout)
timeout = fuse_default_req_timeout;
if (fuse_max_req_timeout) {
if (timeout)
timeout = min(fuse_max_req_timeout, timeout);
else
timeout = fuse_max_req_timeout;
}
timeout = max(FUSE_TIMEOUT_TIMER_FREQ, timeout);
set_request_timeout(fch, timeout);
}
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