1 // SPDX-License-Identifier: GPL-2.0
8  *         option 17 and/or kernel command line options.
19  *	Martin Mares	: (2.0)	Auto-configuration via BOOTP supported.
30  *	Martin Mares	: (2.2)	"0.0.0.0" addresses from command line ignored.
35  *				_afterwards_ - thanks)
40  *	Gero Kuhlmann	:	"0.0.0.0" addresses from command line are
50  *	Jacek Zapala	:	Fixed a bug which prevented server-ip address
70  *	Chuck Lever	:	Use super.c's text-based mount option parsing
99 /* Parameters passed from the kernel command line */
102 /* Text-based mount options passed to super.c */
116  * When the "nfsrootdebug" kernel command line option is specified,
130  *  command line.
132  *  nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>]
134  *  If there is a "%s" token in the <root-dir> string, it is replaced
135  *  by the ASCII-representation of the client's IP address.
137 static int __init nfs_root_setup(char *line)  in nfs_root_setup()  argument
141 	if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) {  in nfs_root_setup()
142 		strscpy(nfs_root_parms, line, sizeof(nfs_root_parms));  in nfs_root_setup()
144 		size_t n = strlen(line) + sizeof(NFS_ROOT) - 1;  in nfs_root_setup()
146 			line[sizeof(nfs_root_parms) - sizeof(NFS_ROOT) - 2] = '\0';  in nfs_root_setup()
147 		sprintf(nfs_root_parms, NFS_ROOT, line);  in nfs_root_setup()
154 	 * Note: root_nfs_parse_addr() removes the server-ip from  in nfs_root_setup()
167 	if (strscpy(dest, src, destlen) == -E2BIG)  in root_nfs_copy()
168 		return -1;  in root_nfs_copy()
177 	if (len && dest[len - 1] != ',')  in root_nfs_cat()
179 			return -1;  in root_nfs_cat()
182 		return -1;  in root_nfs_cat()
188  * passed-in string @incoming.
203 			return -1;  in root_nfs_parse_options()
212 			return -1;  in root_nfs_parse_options()
218  *  the kernel command line.  This has to be done late in order to
222  *  Returns zero if successful; otherwise -1 is returned.
227 	int len, retval = -1;  in root_nfs_data()
237 		dprintk("Root-NFS: DHCPv4 option 17: %s\n",  in root_nfs_data()
244 		dprintk("Root-NFS: nfsroot=%s\n", cmdline);  in root_nfs_data()
264 	 * At this point, utsname()->nodename contains our local  in root_nfs_data()
270 				tmp, utsname()->nodename);  in root_nfs_data()
284 	printk(KERN_ERR "Root-NFS: could not allocate memory\n");  in root_nfs_data()
287 	printk(KERN_ERR "Root-NFS: mount options string too long\n");  in root_nfs_data()
290 	printk(KERN_ERR "Root-NFS: root device name too long.\n");  in root_nfs_data()
295  * nfs_root_data - Return prepared 'data' for NFSROOT mount
300  * otherwise -1 is returned.
306 		printk(KERN_ERR "Root-NFS: no NFS server address\n");  in nfs_root_data()
307 		return -1;  in nfs_root_data()
311 		return -1;  in nfs_root_data()