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94 lines
2.1 KiB
94 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* SMB root file system support |
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* |
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* Copyright (c) 2019 Paulo Alcantara <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/fs.h> |
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#include <linux/types.h> |
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#include <linux/ctype.h> |
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#include <linux/string.h> |
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#include <linux/root_dev.h> |
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#include <linux/kernel.h> |
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#include <linux/in.h> |
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#include <linux/inet.h> |
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#include <net/ipconfig.h> |
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#define DEFAULT_MNT_OPTS \ |
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"vers=1.0,cifsacl,mfsymlinks,rsize=1048576,wsize=65536,uid=0,gid=0," \ |
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"hard,rootfs" |
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static char root_dev[2048] __initdata = ""; |
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static char root_opts[1024] __initdata = DEFAULT_MNT_OPTS; |
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static __be32 __init parse_srvaddr(char *start, char *end) |
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{ |
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/* TODO: ipv6 support */ |
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char addr[sizeof("aaa.bbb.ccc.ddd")]; |
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int i = 0; |
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while (start < end && i < sizeof(addr) - 1) { |
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if (isdigit(*start) || *start == '.') |
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addr[i++] = *start; |
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start++; |
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} |
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addr[i] = '\0'; |
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return in_aton(addr); |
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} |
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/* cifsroot=//<server-ip>/<share>[,options] */ |
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static int __init cifs_root_setup(char *line) |
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{ |
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char *s; |
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int len; |
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__be32 srvaddr = htonl(INADDR_NONE); |
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ROOT_DEV = Root_CIFS; |
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if (strlen(line) > 3 && line[0] == '/' && line[1] == '/') { |
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s = strchr(&line[2], '/'); |
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if (!s || s[1] == '\0') |
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return 1; |
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/* make s point to ',' or '\0' at end of line */ |
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s = strchrnul(s, ','); |
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/* len is strlen(unc) + '\0' */ |
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len = s - line + 1; |
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if (len > sizeof(root_dev)) { |
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pr_err("Root-CIFS: UNC path too long\n"); |
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return 1; |
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} |
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strlcpy(root_dev, line, len); |
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srvaddr = parse_srvaddr(&line[2], s); |
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if (*s) { |
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int n = snprintf(root_opts, |
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sizeof(root_opts), "%s,%s", |
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DEFAULT_MNT_OPTS, s + 1); |
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if (n >= sizeof(root_opts)) { |
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pr_err("Root-CIFS: mount options string too long\n"); |
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root_opts[sizeof(root_opts)-1] = '\0'; |
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return 1; |
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} |
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} |
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} |
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root_server_addr = srvaddr; |
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return 1; |
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} |
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__setup("cifsroot=", cifs_root_setup); |
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int __init cifs_root_data(char **dev, char **opts) |
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{ |
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if (!root_dev[0] || root_server_addr == htonl(INADDR_NONE)) { |
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pr_err("Root-CIFS: no SMB server address\n"); |
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return -1; |
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} |
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*dev = root_dev; |
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*opts = root_opts; |
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return 0; |
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}
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