mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
9b17cb59a7
Introduce two new sysctls, "default_request_timeout" and "max_request_timeout". These control how long (in seconds) a server can take to reply to a request. If the server does not reply by the timeout, then the connection will be aborted. The upper bound on these sysctl values is 65535. "default_request_timeout" sets the default timeout if no timeout is specified by the fuse server on mount. 0 (default) indicates no default timeout should be enforced. If the server did specify a timeout, then default_request_timeout will be ignored. "max_request_timeout" sets the max amount of time the server may take to reply to a request. 0 (default) indicates no maximum timeout. If max_request_timeout is set and the fuse server attempts to set a timeout greater than max_request_timeout, the system will use max_request_timeout as the timeout. Similarly, if default_request_timeout is greater than max_request_timeout, the system will use max_request_timeout as the timeout. If the server does not request a timeout and default_request_timeout is set to 0 but max_request_timeout is set, then the timeout will be max_request_timeout. Please note that these timeouts are not 100% precise. The request may take roughly an extra FUSE_TIMEOUT_TIMER_FREQ seconds beyond the set max timeout due to how it's internally implemented. $ sysctl -a | grep fuse.default_request_timeout fs.fuse.default_request_timeout = 0 $ echo 65536 | sudo tee /proc/sys/fs/fuse/default_request_timeout tee: /proc/sys/fs/fuse/default_request_timeout: Invalid argument $ echo 65535 | sudo tee /proc/sys/fs/fuse/default_request_timeout 65535 $ sysctl -a | grep fuse.default_request_timeout fs.fuse.default_request_timeout = 65535 $ echo 0 | sudo tee /proc/sys/fs/fuse/default_request_timeout 0 $ sysctl -a | grep fuse.default_request_timeout fs.fuse.default_request_timeout = 0 [Luis Henriques: Limit the timeout to the range [FUSE_TIMEOUT_TIMER_FREQ, fuse_max_req_timeout]] Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Reviewed-by: Bernd Schubert <bschubert@ddn.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Reviewed-by: Luis Henriques <luis@igalia.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/fs/fuse/fuse_sysctl.c
|
|
*
|
|
* Sysctl interface to fuse parameters
|
|
*/
|
|
#include <linux/sysctl.h>
|
|
|
|
#include "fuse_i.h"
|
|
|
|
static struct ctl_table_header *fuse_table_header;
|
|
|
|
/* Bound by fuse_init_out max_pages, which is a u16 */
|
|
static unsigned int sysctl_fuse_max_pages_limit = 65535;
|
|
|
|
/*
|
|
* fuse_init_out request timeouts are u16.
|
|
* This goes up to ~18 hours, which is plenty for a timeout.
|
|
*/
|
|
static unsigned int sysctl_fuse_req_timeout_limit = 65535;
|
|
|
|
static const struct ctl_table fuse_sysctl_table[] = {
|
|
{
|
|
.procname = "max_pages_limit",
|
|
.data = &fuse_max_pages_limit,
|
|
.maxlen = sizeof(fuse_max_pages_limit),
|
|
.mode = 0644,
|
|
.proc_handler = proc_douintvec_minmax,
|
|
.extra1 = SYSCTL_ONE,
|
|
.extra2 = &sysctl_fuse_max_pages_limit,
|
|
},
|
|
{
|
|
.procname = "default_request_timeout",
|
|
.data = &fuse_default_req_timeout,
|
|
.maxlen = sizeof(fuse_default_req_timeout),
|
|
.mode = 0644,
|
|
.proc_handler = proc_douintvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = &sysctl_fuse_req_timeout_limit,
|
|
},
|
|
{
|
|
.procname = "max_request_timeout",
|
|
.data = &fuse_max_req_timeout,
|
|
.maxlen = sizeof(fuse_max_req_timeout),
|
|
.mode = 0644,
|
|
.proc_handler = proc_douintvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = &sysctl_fuse_req_timeout_limit,
|
|
},
|
|
};
|
|
|
|
int fuse_sysctl_register(void)
|
|
{
|
|
fuse_table_header = register_sysctl("fs/fuse", fuse_sysctl_table);
|
|
if (!fuse_table_header)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void fuse_sysctl_unregister(void)
|
|
{
|
|
unregister_sysctl_table(fuse_table_header);
|
|
fuse_table_header = NULL;
|
|
}
|