1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/fuse/fuse_sysctl.c 4 * 5 * Sysctl interface to fuse parameters 6 */ 7 #include <linux/sysctl.h> 8 9 #include "fuse_i.h" 10 11 static struct ctl_table_header *fuse_table_header; 12 13 /* Bound by fuse_init_out max_pages, which is a u16 */ 14 static unsigned int sysctl_fuse_max_pages_limit = 65535; 15 16 /* 17 * fuse_init_out request timeouts are u16. 18 * This goes up to ~18 hours, which is plenty for a timeout. 19 */ 20 static unsigned int sysctl_fuse_req_timeout_limit = 65535; 21 22 static const struct ctl_table fuse_sysctl_table[] = { 23 { 24 .procname = "max_pages_limit", 25 .data = &fuse_max_pages_limit, 26 .maxlen = sizeof(fuse_max_pages_limit), 27 .mode = 0644, 28 .proc_handler = proc_douintvec_minmax, 29 .extra1 = SYSCTL_ONE, 30 .extra2 = &sysctl_fuse_max_pages_limit, 31 }, 32 { 33 .procname = "default_request_timeout", 34 .data = &fuse_default_req_timeout, 35 .maxlen = sizeof(fuse_default_req_timeout), 36 .mode = 0644, 37 .proc_handler = proc_douintvec_minmax, 38 .extra1 = SYSCTL_ZERO, 39 .extra2 = &sysctl_fuse_req_timeout_limit, 40 }, 41 { 42 .procname = "max_request_timeout", 43 .data = &fuse_max_req_timeout, 44 .maxlen = sizeof(fuse_max_req_timeout), 45 .mode = 0644, 46 .proc_handler = proc_douintvec_minmax, 47 .extra1 = SYSCTL_ZERO, 48 .extra2 = &sysctl_fuse_req_timeout_limit, 49 }, 50 }; 51 52 int fuse_sysctl_register(void) 53 { 54 fuse_table_header = register_sysctl("fs/fuse", fuse_sysctl_table); 55 if (!fuse_table_header) 56 return -ENOMEM; 57 return 0; 58 } 59 60 void fuse_sysctl_unregister(void) 61 { 62 unregister_sysctl_table(fuse_table_header); 63 fuse_table_header = NULL; 64 } 65