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 "sysctl.h" 10 #include "fuse_i.h" 11 12 static struct ctl_table_header *fuse_table_header; 13 14 /* Bound by fuse_init_out max_pages, which is a u16 */ 15 static unsigned int sysctl_fuse_max_pages_limit = 65535; 16 17 /* 18 * fuse_init_out request timeouts are u16. 19 * This goes up to ~18 hours, which is plenty for a timeout. 20 */ 21 static unsigned int sysctl_fuse_req_timeout_limit = 65535; 22 23 static const struct ctl_table fuse_sysctl_table[] = { 24 { 25 .procname = "max_pages_limit", 26 .data = &fuse_max_pages_limit, 27 .maxlen = sizeof(fuse_max_pages_limit), 28 .mode = 0644, 29 .proc_handler = proc_douintvec_minmax, 30 .extra1 = SYSCTL_ONE, 31 .extra2 = &sysctl_fuse_max_pages_limit, 32 }, 33 { 34 .procname = "default_request_timeout", 35 .data = &fuse_default_req_timeout, 36 .maxlen = sizeof(fuse_default_req_timeout), 37 .mode = 0644, 38 .proc_handler = proc_douintvec_minmax, 39 .extra1 = SYSCTL_ZERO, 40 .extra2 = &sysctl_fuse_req_timeout_limit, 41 }, 42 { 43 .procname = "max_request_timeout", 44 .data = &fuse_max_req_timeout, 45 .maxlen = sizeof(fuse_max_req_timeout), 46 .mode = 0644, 47 .proc_handler = proc_douintvec_minmax, 48 .extra1 = SYSCTL_ZERO, 49 .extra2 = &sysctl_fuse_req_timeout_limit, 50 }, 51 }; 52 53 int fuse_sysctl_register(void) 54 { 55 fuse_table_header = register_sysctl("fs/fuse", fuse_sysctl_table); 56 if (!fuse_table_header) 57 return -ENOMEM; 58 return 0; 59 } 60 61 void fuse_sysctl_unregister(void) 62 { 63 unregister_sysctl_table(fuse_table_header); 64 fuse_table_header = NULL; 65 } 66