^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * net/9p/9p.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * 9P entry point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <net/9p/9p.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <net/9p/client.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <net/9p/transport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #ifdef CONFIG_NET_9P_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) unsigned int p9_debug_level = 0; /* feature-rific global debug level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) EXPORT_SYMBOL(p9_debug_level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) module_param_named(debug, p9_debug_level, uint, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) MODULE_PARM_DESC(debug, "9P debugging level");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) void _p9_debug(enum p9_debug_flags level, const char *func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) const char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct va_format vaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) va_list args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if ((p9_debug_level & level) != level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) va_start(args, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) vaf.fmt = fmt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) vaf.va = &args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (level == P9_DEBUG_9P)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) pr_notice("(%8.8d) %pV", task_pid_nr(current), &vaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pr_notice("-- %s (%d): %pV", func, task_pid_nr(current), &vaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) va_end(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) EXPORT_SYMBOL(_p9_debug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * Dynamic Transport Registration Routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static DEFINE_SPINLOCK(v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static LIST_HEAD(v9fs_trans_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * v9fs_register_trans - register a new transport with 9p
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * @m: structure describing the transport module and entry points
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) void v9fs_register_trans(struct p9_trans_module *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) spin_lock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) list_add_tail(&m->list, &v9fs_trans_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) spin_unlock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) EXPORT_SYMBOL(v9fs_register_trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * v9fs_unregister_trans - unregister a 9p transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * @m: the transport to remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) void v9fs_unregister_trans(struct p9_trans_module *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) spin_lock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) list_del_init(&m->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) spin_unlock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) EXPORT_SYMBOL(v9fs_unregister_trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * v9fs_get_trans_by_name - get transport with the matching name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * @s: string identifying transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct p9_trans_module *v9fs_get_trans_by_name(char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct p9_trans_module *t, *found = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) spin_lock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) list_for_each_entry(t, &v9fs_trans_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (strcmp(t->name, s) == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) try_module_get(t->owner)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) found = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) spin_unlock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) EXPORT_SYMBOL(v9fs_get_trans_by_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * v9fs_get_default_trans - get the default transport
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct p9_trans_module *v9fs_get_default_trans(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct p9_trans_module *t, *found = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) spin_lock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) list_for_each_entry(t, &v9fs_trans_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (t->def && try_module_get(t->owner)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) found = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (!found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) list_for_each_entry(t, &v9fs_trans_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (try_module_get(t->owner)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) found = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) spin_unlock(&v9fs_trans_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) EXPORT_SYMBOL(v9fs_get_default_trans);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * v9fs_put_trans - put trans
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * @m: transport to put
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void v9fs_put_trans(struct p9_trans_module *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) module_put(m->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * init_p9 - Initialize module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int __init init_p9(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ret = p9_client_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) p9_error_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) pr_info("Installing 9P2000 support\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) p9_trans_fd_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * exit_p9 - shutdown module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static void __exit exit_p9(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) pr_info("Unloading 9P2000 support\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) p9_trans_fd_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) p9_client_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) module_init(init_p9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) module_exit(exit_p9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) MODULE_DESCRIPTION("Plan 9 Resource Sharing Support (9P2000)");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags