^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 1995, 1996 Gero Kuhlmann <gero@gkminix.han.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Allow an NFS filesystem to be mounted as root. The way this works is:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * (1) Use the IP autoconfig mechanism to set local IP addresses and routes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * (2) Construct the device string and the options string using DHCP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * option 17 and/or kernel command line options.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * (3) When mount_root() sets up the root file system, pass these strings
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * to the NFS client's regular mount interface via sys_mount().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Changes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Alan Cox : Removed get_address name clash with FPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Alan Cox : Reformatted a bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Gero Kuhlmann : Code cleanup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Michael Rausch : Fixed recognition of an incoming RARP answer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Martin Mares : (2.0) Auto-configuration via BOOTP supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Martin Mares : Manual selection of interface & BOOTP/RARP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Martin Mares : Using network routes instead of host routes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * allowing the default configuration to be used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * for normal operation of the host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Martin Mares : Randomized timer with exponential backoff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * installed to minimize network congestion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Martin Mares : Code cleanup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Martin Mares : (2.1) BOOTP and RARP made configuration options.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Martin Mares : Server hostname generation fixed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * Gerd Knorr : Fixed wired inode handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Martin Mares : (2.2) "0.0.0.0" addresses from command line ignored.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Martin Mares : RARP replies not tested for server address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * Gero Kuhlmann : (2.3) Some bug fixes and code cleanup again (please
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * send me your new patches _before_ bothering
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Linus so that I don' always have to cleanup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * _afterwards_ - thanks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Gero Kuhlmann : Last changes of Martin Mares undone.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Gero Kuhlmann : RARP replies are tested for specified server
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * again. However, it's now possible to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * different RARP and NFS servers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Gero Kuhlmann : "0.0.0.0" addresses from command line are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * now mapped to INADDR_NONE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * Gero Kuhlmann : Fixed a bug which prevented BOOTP path name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * from being used (thanks to Leo Spiekman)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * Andy Walker : Allow to specify the NFS server in nfs_root
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * without giving a path name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Swen Thümmler : Allow to specify the NFS options in nfs_root
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * without giving a path name. Fix BOOTP request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * for domainname (domainname is NIS domain, not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * DNS domain!). Skip dummy devices for BOOTP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Jacek Zapala : Fixed a bug which prevented server-ip address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * from nfsroot parameter from being used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * Olaf Kirch : Adapted to new NFS code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * Jakub Jelinek : Free used code segment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * Marko Kohtala : Fixed some bugs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Martin Mares : Debug message cleanup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Martin Mares : Changed to use the new generic IP layer autoconfig
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * code. BOOTP and RARP moved there.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * Martin Mares : Default path now contains host name instead of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * host IP address (but host name defaults to IP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * address anyway).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * Martin Mares : Use root_server_addr appropriately during setup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * Martin Mares : Rewrote parameter parsing, now hopefully giving
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * correct overriding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * Trond Myklebust : Add in preliminary support for NFSv3 and TCP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * Fix bug in root_nfs_addr(). nfs_data.namlen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * is NOT for the length of the hostname.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * Hua Qin : Support for mounting root file system via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * NFS over TCP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Fabian Frederick: Option parser rebuilt (using parser lib)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * Chuck Lever : Use super.c's text-based mount option parsing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * Chuck Lever : Add "nfsrootdebug".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #include <linux/nfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #include <linux/nfs_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #include <linux/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #include <linux/root_dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #include <net/ipconfig.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #define NFSDBG_FACILITY NFSDBG_ROOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* Default path we try to mount. "%s" gets replaced by our IP address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #define NFS_ROOT "/tftpboot/%s"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* Default NFSROOT mount options. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #if defined(CONFIG_NFS_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #define NFS_DEF_OPTIONS "vers=2,tcp,rsize=4096,wsize=4096"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #elif defined(CONFIG_NFS_V3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #define NFS_DEF_OPTIONS "vers=3,tcp,rsize=4096,wsize=4096"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define NFS_DEF_OPTIONS "vers=4,tcp,rsize=4096,wsize=4096"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* Parameters passed from the kernel command line */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static char nfs_root_parms[NFS_MAXPATHLEN + 1] __initdata = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* Text-based mount options passed to super.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static char nfs_root_options[256] __initdata = NFS_DEF_OPTIONS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* Address of NFS server */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static __be32 servaddr __initdata = htonl(INADDR_NONE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* Name of directory to mount */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /* server:export path string passed to super.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static char nfs_root_device[NFS_MAXPATHLEN + 1] __initdata = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #ifdef NFS_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * When the "nfsrootdebug" kernel command line option is specified,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * enable debugging messages for NFSROOT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int __init nfs_root_debug(char *__unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) nfs_debug |= NFSDBG_ROOT | NFSDBG_MOUNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) __setup("nfsrootdebug", nfs_root_debug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * Parse NFS server and directory information passed on the kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * command line.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * If there is a "%s" token in the <root-dir> string, it is replaced
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * by the ASCII-representation of the client's IP address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static int __init nfs_root_setup(char *line)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ROOT_DEV = Root_NFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) strlcpy(nfs_root_parms, line, sizeof(nfs_root_parms));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) size_t n = strlen(line) + sizeof(NFS_ROOT) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (n >= sizeof(nfs_root_parms))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) line[sizeof(nfs_root_parms) - sizeof(NFS_ROOT) - 2] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) sprintf(nfs_root_parms, NFS_ROOT, line);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * Extract the IP address of the NFS server containing our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * root file system, if one was specified.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * Note: root_nfs_parse_addr() removes the server-ip from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * nfs_root_parms, if it exists.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) root_server_addr = root_nfs_parse_addr(nfs_root_parms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) __setup("nfsroot=", nfs_root_setup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static int __init root_nfs_copy(char *dest, const char *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) const size_t destlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (strlcpy(dest, src, destlen) > destlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return 0;
^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) static int __init root_nfs_cat(char *dest, const char *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) const size_t destlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) size_t len = strlen(dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (len && dest[len - 1] != ',')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (strlcat(dest, ",", destlen) > destlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (strlcat(dest, src, destlen) > destlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * Parse out root export path and mount options from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * passed-in string @incoming.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * Copy the export path into @exppath.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static int __init root_nfs_parse_options(char *incoming, char *exppath,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) const size_t exppathlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * Set the NFS remote path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) p = strsep(&incoming, ",");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (*p != '\0' && strcmp(p, "default") != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (root_nfs_copy(exppath, p, exppathlen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * @incoming now points to the rest of the string; if it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * contains something, append it to our root options buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (incoming != NULL && *incoming != '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (root_nfs_cat(nfs_root_options, incoming,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) sizeof(nfs_root_options)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * Decode the export directory path name and NFS options from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * the kernel command line. This has to be done late in order to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * use a dynamically acquired client IP address for the remote
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * root directory path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * Returns zero if successful; otherwise -1 is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static int __init root_nfs_data(char *cmdline)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) char mand_options[sizeof("nolock,addr=") + INET_ADDRSTRLEN + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) int len, retval = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) char *tmp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) const size_t tmplen = sizeof(nfs_export_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) tmp = kzalloc(tmplen, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (tmp == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) goto out_nomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) strcpy(tmp, NFS_ROOT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (root_server_path[0] != '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) dprintk("Root-NFS: DHCPv4 option 17: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) root_server_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) if (root_nfs_parse_options(root_server_path, tmp, tmplen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) goto out_optionstoolong;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (cmdline[0] != '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) dprintk("Root-NFS: nfsroot=%s\n", cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (root_nfs_parse_options(cmdline, tmp, tmplen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) goto out_optionstoolong;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * Append mandatory options for nfsroot so they override
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * what has come before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) snprintf(mand_options, sizeof(mand_options), "nolock,addr=%pI4",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) &servaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (root_nfs_cat(nfs_root_options, mand_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) sizeof(nfs_root_options)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) goto out_optionstoolong;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * Set up nfs_root_device. For NFS mounts, this looks like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * server:/path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * At this point, utsname()->nodename contains our local
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * IP address or hostname, set by ipconfig. If "%s" exists
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * in tmp, substitute the nodename, then shovel the whole
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) * mess into nfs_root_device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) len = snprintf(nfs_export_path, sizeof(nfs_export_path),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) tmp, utsname()->nodename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (len >= (int)sizeof(nfs_export_path))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) goto out_devnametoolong;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) len = snprintf(nfs_root_device, sizeof(nfs_root_device),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) "%pI4:%s", &servaddr, nfs_export_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (len >= (int)sizeof(nfs_root_device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) goto out_devnametoolong;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) kfree(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) out_nomem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) printk(KERN_ERR "Root-NFS: could not allocate memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) out_optionstoolong:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) printk(KERN_ERR "Root-NFS: mount options string too long\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) out_devnametoolong:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) printk(KERN_ERR "Root-NFS: root device name too long.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * nfs_root_data - Return prepared 'data' for NFSROOT mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * @root_device: OUT: address of string containing NFSROOT device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * @root_data: OUT: address of string containing NFSROOT mount options
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) * Returns zero and sets @root_device and @root_data if successful,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * otherwise -1 is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) int __init nfs_root_data(char **root_device, char **root_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) servaddr = root_server_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (servaddr == htonl(INADDR_NONE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) printk(KERN_ERR "Root-NFS: no NFS server address\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (root_nfs_data(nfs_root_parms) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) *root_device = nfs_root_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) *root_data = nfs_root_options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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