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2b3933b1e0
Introduce the capability to dynamically configure the max pages limit (FUSE_MAX_MAX_PAGES) through a sysctl. This allows system administrators to dynamically set the maximum number of pages that can be used for servicing requests in fuse. Previously, this is gated by FUSE_MAX_MAX_PAGES which is statically set to 256 pages. One result of this is that the buffer size for a write request is limited to 1 MiB on a 4k-page system. The default value for this sysctl is the original limit (256 pages). $ sysctl -a | grep max_pages_limit fs.fuse.max_pages_limit = 256 $ sysctl -n fs.fuse.max_pages_limit 256 $ echo 1024 | sudo tee /proc/sys/fs/fuse/max_pages_limit 1024 $ sysctl -n fs.fuse.max_pages_limit 1024 $ echo 65536 | sudo tee /proc/sys/fs/fuse/max_pages_limit tee: /proc/sys/fs/fuse/max_pages_limit: Invalid argument $ echo 0 | sudo tee /proc/sys/fs/fuse/max_pages_limit tee: /proc/sys/fs/fuse/max_pages_limit: Invalid argument $ echo 65535 | sudo tee /proc/sys/fs/fuse/max_pages_limit 65535 $ sysctl -n fs.fuse.max_pages_limit 65535 Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
41 lines
892 B
C
41 lines
892 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/fuse/fuse_sysctl.c
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*
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* Sysctl interface to fuse parameters
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*/
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#include <linux/sysctl.h>
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#include "fuse_i.h"
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static struct ctl_table_header *fuse_table_header;
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/* Bound by fuse_init_out max_pages, which is a u16 */
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static unsigned int sysctl_fuse_max_pages_limit = 65535;
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static struct ctl_table fuse_sysctl_table[] = {
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{
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.procname = "max_pages_limit",
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.data = &fuse_max_pages_limit,
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.maxlen = sizeof(fuse_max_pages_limit),
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.mode = 0644,
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.proc_handler = proc_douintvec_minmax,
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.extra1 = SYSCTL_ONE,
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.extra2 = &sysctl_fuse_max_pages_limit,
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},
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};
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int fuse_sysctl_register(void)
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{
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fuse_table_header = register_sysctl("fs/fuse", fuse_sysctl_table);
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if (!fuse_table_header)
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return -ENOMEM;
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return 0;
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}
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void fuse_sysctl_unregister(void)
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{
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unregister_sysctl_table(fuse_table_header);
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fuse_table_header = NULL;
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}
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