[PATCH] table-driven filesystems option parsing

From: "Randy.Dunlap" <rddunlap@osdl.org>, Will Dyson <will_dyson@pobox.com>, me

Add generic filesystem options parser (infrastructure) and use it to parse
mount options in several filesystems (adfs, affs, autofs, autofs4, ext2,
ext3, fat, hfs, hpfs, isofs, jfs, procfs, udf, and ufs).

It saves between 128 and 512 bytes per filesystem.

fs/adfs/super.c

@@ -18,6 +18,7 @@
 #include <linux/init.h>
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>
+#include <linux/parser.h>
 
 #include <asm/bitops.h>
 #include <asm/uaccess.h>
@@ -133,50 +134,56 @@ static void adfs_put_super(struct super_block *sb)
 	sb->s_fs_info = NULL;
 }
 
+enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
+
+static match_table_t tokens = {
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_ownmask, "ownmask=%o"},
+	{Opt_othmask, "othmask=%o"},
+	{Opt_err, NULL}
+};
+
 static int parse_options(struct super_block *sb, char *options)
 {
-	char *value, *opt;
+	char *p;
 	struct adfs_sb_info *asb = ADFS_SB(sb);
+	int option;
 
 	if (!options)
 		return 0;
 
-	while ((opt = strsep(&options, ",")) != NULL) {
-		if (!*opt)
+	while ((p = strsep(&options, ",")) != NULL) {
+		substring_t args[MAX_OPT_ARGS];
+		int token;
+		if (!*p)
 			continue;
-		value = strchr(opt, '=');
-		if (value)
-			*value++ = '\0';
 
-		if (!strcmp(opt, "uid")) {	/* owner of all files */
-			if (!value || !*value)
-				return -EINVAL;
-			asb->s_uid = simple_strtoul(value, &value, 0);
-			if (*value)
-				return -EINVAL;
-		} else
-		if (!strcmp(opt, "gid")) {	/* group owner of all files */
-			if (!value || !*value)
-				return -EINVAL;
-			asb->s_gid = simple_strtoul(value, &value, 0);
-			if (*value)
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_uid:
+			if (match_int(args, &option))
 				return -EINVAL;
-		} else
-		if (!strcmp(opt, "ownmask")) {	/* owner permission mask */
-			if (!value || !*value)
+			asb->s_uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
 				return -EINVAL;
-			asb->s_owner_mask = simple_strtoul(value, &value, 8);
-			if (*value)
-				return -EINVAL;
-		} else
-		if (!strcmp(opt, "othmask")) {	/* others permission mask */
-			if (!value || !*value)
+			asb->s_gid = option;
+			break;
+		case Opt_ownmask:
+			if (match_octal(args, &option))
 				return -EINVAL;
-			asb->s_other_mask = simple_strtoul(value, &value, 8);
-			if (*value)
+			asb->s_owner_mask = option;
+			break;
+		case Opt_othmask:
+			if (match_octal(args, &option))
 				return -EINVAL;
-		} else {			/* eh? say again. */
-			printk("ADFS-fs: unrecognised mount option %s\n", opt);
+			asb->s_other_mask = option;
+			break;
+		default:
+			printk("ADFS-fs: unrecognised mount option \"%s\" "
+					"or missing value\n", p);
 			return -EINVAL;
 		}
 	}

fs/affs/super.c

@@ -28,6 +28,7 @@
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>
+#include <linux/parser.h>
 #include <asm/system.h>
 #include <asm/uaccess.h>
 
@@ -142,12 +143,37 @@ static struct super_operations affs_sops = {
 	.remount_fs	= affs_remount,
 };
 
+enum {
+	Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
+	Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
+	Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
+};
+
+static match_table_t tokens = {
+	{Opt_bs, "bs=%d"},
+	{Opt_mode, "mode=%o"},
+	{Opt_mufs, "mufs"},
+	{Opt_prefix, "prefix=%s"},
+	{Opt_protect, "protect"},
+	{Opt_reserved, "reserved=%d"},
+	{Opt_root, "root=%d"},
+	{Opt_setgid, "setgid=%d"},
+	{Opt_setuid, "setuid=%d"},
+	{Opt_verbose, "verbose"},
+	{Opt_volume, "volume=%s"},
+	{Opt_ignore, "grpquota"},
+	{Opt_ignore, "noquota"},
+	{Opt_ignore, "quota"},
+	{Opt_ignore, "usrquota"},
+	{Opt_err, NULL},
+};
+
 static int
 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
 		int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
 {
-	char	*this_char, *value, *optn;
-	int	 f;
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
 
 	/* Fill in defaults */
 
@@ -161,109 +187,85 @@ parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s
 	*mount_opts = 0;
 	if (!options)
 		return 1;
-	while ((this_char = strsep(&options, ",")) != NULL) {
-		if (!*this_char)
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token, n, option;
+		if (!*p)
 			continue;
-		f = 0;
-		if ((value = strchr(this_char,'=')) != NULL)
-			*value++ = 0;
-		if ((optn = "protect") && !strcmp(this_char, optn)) {
-			if (value)
-				goto out_inv_arg;
-			*mount_opts |= SF_IMMUTABLE;
-		} else if ((optn = "verbose") && !strcmp(this_char, optn)) {
-			if (value)
-				goto out_inv_arg;
-			*mount_opts |= SF_VERBOSE;
-		} else if ((optn = "mufs") && !strcmp(this_char, optn)) {
-			if (value)
-				goto out_inv_arg;
-			*mount_opts |= SF_MUFS;
-		} else if ((f = !strcmp(this_char,"setuid")) || !strcmp(this_char,"setgid")) {
-			if (value) {
-				if (!*value) {
-					printk("AFFS: Argument for set[ug]id option missing\n");
-					return 0;
-				} else {
-					(f ? *uid : *gid) = simple_strtoul(value,&value,0);
-					if (*value) {
-						printk("AFFS: Bad set[ug]id argument\n");
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_bs:
+			if (match_int(&args[0], &n))
+				return -EINVAL;
+			if (n != 512 && n != 1024 && n != 2048
+			    && n != 4096) {
+				printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
 				return 0;
 			}
-					*mount_opts |= f ? SF_SETUID : SF_SETGID;
-				}
-			}
-		} else if (!strcmp(this_char,"prefix")) {
-			optn = "prefix";
-			if (!value || !*value)
-				goto out_no_arg;
+			*blocksize = n;
+			break;
+		case Opt_mode:
+			if (match_octal(&args[0], &option))
+				return 1;
+			*mode = option & 0777;
+			*mount_opts |= SF_SETMODE;
+			break;
+		case Opt_mufs:
+			*mount_opts |= SF_MUFS;
+			break;
+		case Opt_prefix:
 			if (*prefix) {		/* Free any previous prefix */
 				kfree(*prefix);
 				*prefix = NULL;
 			}
-			*prefix = kmalloc(strlen(value) + 1,GFP_KERNEL);
+			*prefix = match_strdup(&args[0]);
 			if (!*prefix)
 				return 0;
-			strcpy(*prefix,value);
 			*mount_opts |= SF_PREFIX;
-		} else if (!strcmp(this_char,"volume")) {
-			optn = "volume";
-			if (!value || !*value)
-				goto out_no_arg;
-			strlcpy(volume,value,31);
-		} else if (!strcmp(this_char,"mode")) {
-			optn = "mode";
-			if (!value || !*value)
-				goto out_no_arg;
-			*mode = simple_strtoul(value,&value,8) & 0777;
-			if (*value)
-				return 0;
-			*mount_opts |= SF_SETMODE;
-		} else if (!strcmp(this_char,"reserved")) {
-			optn = "reserved";
-			if (!value || !*value)
-				goto out_no_arg;
-			*reserved = simple_strtoul(value,&value,0);
-			if (*value)
-				return 0;
-		} else if (!strcmp(this_char,"root")) {
-			optn = "root";
-			if (!value || !*value)
-				goto out_no_arg;
-			*root = simple_strtoul(value,&value,0);
-			if (*value)
-				return 0;
-		} else if (!strcmp(this_char,"bs")) {
-			optn = "bs";
-			if (!value || !*value)
-				goto out_no_arg;
-			*blocksize = simple_strtoul(value,&value,0);
-			if (*value)
-				return 0;
-			if (*blocksize != 512 && *blocksize != 1024 && *blocksize != 2048
-			    && *blocksize != 4096) {
-				printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
-				return 0;
+			break;
+		case Opt_protect:
+			*mount_opts |= SF_IMMUTABLE;
+			break;
+		case Opt_reserved:
+			if (match_int(&args[0], reserved))
+				return 1;
+			break;
+		case Opt_root:
+			if (match_int(&args[0], root))
+				return 1;
+			break;
+		case Opt_setgid:
+			if (match_int(&args[0], &option))
+				return 1;
+			*gid = option;
+			*mount_opts |= SF_SETGID;
+			break;
+		case Opt_setuid:
+			if (match_int(&args[0], &option))
+				return -EINVAL;
+			*uid = option;
+			*mount_opts |= SF_SETUID;
+			break;
+		case Opt_verbose:
+			*mount_opts |= SF_VERBOSE;
+			break;
+		case Opt_volume: {
+			char *vol = match_strdup(&args[0]);
+			strlcpy(volume, vol, 32);
+			kfree(vol);
+			break;
 		}
-		} else if (!strcmp (this_char, "grpquota")
-			 || !strcmp (this_char, "noquota")
-			 || !strcmp (this_char, "quota")
-			 || !strcmp (this_char, "usrquota"))
+		case Opt_ignore:
 		 	/* Silently ignore the quota options */
-			;
-		else {
-			printk("AFFS: Unrecognized mount option %s\n", this_char);
+			break;
+		default:
+			printk("AFFS: Unrecognized mount option \"%s\" "
+					"or missing value\n", p);
 			return 0;
 		}
 	}
 	return 1;
-
-out_no_arg:
-	printk("AFFS: The %s option requires an argument\n", optn);
-	return 0;
-out_inv_arg:
-	printk("AFFS: Option %s does not take an argument\n", optn);
-	return 0;
 }
 
 /* This function definitely needs to be split up. Some fine day I'll

fs/autofs/inode.c

@@ -14,6 +14,7 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/file.h>
+#include <linux/parser.h>
 #include <asm/bitops.h>
 #include "autofs_i.h"
 #include <linux/module.h>
@@ -45,9 +46,23 @@ static struct super_operations autofs_sops = {
 	.statfs		= simple_statfs,
 };
 
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+
+static match_table_t autofs_tokens = {
+	{Opt_fd, "fd=%d"},
+	{Opt_uid, "uid=%d"},
+	{Opt_gid, "gid=%d"},
+	{Opt_pgrp, "pgrp=%d"},
+	{Opt_minproto, "minproto=%d"},
+	{Opt_maxproto, "maxproto=%d"},
+	{Opt_err, NULL}
+};
+
 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid_t *pgrp, int *minproto, int *maxproto)
 {
-	char *this_char, *value;
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
 
 	*uid = current->uid;
 	*gid = current->gid;
@@ -57,55 +72,49 @@ static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid, pid
 
 	*pipefd = -1;
 
-	if ( !options ) return 1;
-	while ((this_char = strsep(&options,",")) != NULL) {
-		if (!*this_char)
-			continue;
-		if ((value = strchr(this_char,'=')) != NULL)
-			*value++ = 0;
-		if (!strcmp(this_char,"fd")) {
-			if (!value || !*value)
-				return 1;
-			*pipefd = simple_strtoul(value,&value,0);
-			if (*value)
-				return 1;
-		}
-		else if (!strcmp(this_char,"uid")) {
-			if (!value || !*value)
-				return 1;
-			*uid = simple_strtoul(value,&value,0);
-			if (*value)
+	if (!options)
 		return 1;
-		}
-		else if (!strcmp(this_char,"gid")) {
-			if (!value || !*value)
-				return 1;
-			*gid = simple_strtoul(value,&value,0);
-			if (*value)
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+
+		token = match_token(p, autofs_tokens, args);
+		switch (token) {
+		case Opt_fd:
+			if (match_int(&args[0], &option))
 				return 1;
-		}
-		else if (!strcmp(this_char,"pgrp")) {
-			if (!value || !*value)
+			*pipefd = option;
+			break;
+		case Opt_uid:
+			if (match_int(&args[0], &option))
 				return 1;
-			*pgrp = simple_strtoul(value,&value,0);
-			if (*value)
+			*uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(&args[0], &option))
 				return 1;
-		}
-		else if (!strcmp(this_char,"minproto")) {
-			if (!value || !*value)
+			*gid = option;
+			break;
+		case Opt_pgrp:
+			if (match_int(&args[0], &option))
 				return 1;
-			*minproto = simple_strtoul(value,&value,0);
-			if (*value)
+			*pgrp = option;
+			break;
+		case Opt_minproto:
+			if (match_int(&args[0], &option))
 				return 1;
-		}
-		else if (!strcmp(this_char,"maxproto")) {
-			if (!value || !*value)
+			*minproto = option;
+			break;
+		case Opt_maxproto:
+			if (match_int(&args[0], &option))
 				return 1;
-			*maxproto = simple_strtoul(value,&value,0);
-			if (*value)
+			*maxproto = option;
+			break;
+		default:
 			return 1;
 		}
-		else break;
 	}
 	return (*pipefd < 0);
 }

fs/autofs4/inode.c

@@ -14,6 +14,7 @@
 #include <linux/slab.h>
 #include <linux/file.h>
 #include <linux/pagemap.h>
+#include <linux/parser.h>
 #include <asm/bitops.h>
 #include "autofs_i.h"
 #include <linux/module.h>
@@ -94,10 +95,24 @@ static struct super_operations autofs4_sops = {
 	.statfs		= simple_statfs,
 };
 
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+
+static match_table_t tokens = {
+	{Opt_fd, "fd=%d"},
+	{Opt_uid, "uid=%d"},
+	{Opt_gid, "gid=%d"},
+	{Opt_pgrp, "pgrp=%d"},
+	{Opt_minproto, "minproto=%d"},
+	{Opt_maxproto, "maxproto=%d"},
+	{Opt_err, NULL}
+};
+
 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
 			 pid_t *pgrp, int *minproto, int *maxproto)
 {
-	char *this_char, *value;
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
 
 	*uid = current->uid;
 	*gid = current->gid;
@@ -108,55 +123,48 @@ static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
 
 	*pipefd = -1;
 
-	if ( !options ) return 1;
-	while ((this_char = strsep(&options,",")) != NULL) {
-		if (!*this_char)
-			continue;
-		if ((value = strchr(this_char,'=')) != NULL)
-			*value++ = 0;
-		if (!strcmp(this_char,"fd")) {
-			if (!value || !*value)
-				return 1;
-			*pipefd = simple_strtoul(value,&value,0);
-			if (*value)
-				return 1;
-		}
-		else if (!strcmp(this_char,"uid")) {
-			if (!value || !*value)
-				return 1;
-			*uid = simple_strtoul(value,&value,0);
-			if (*value)
+	if (!options)
 		return 1;
-		}
-		else if (!strcmp(this_char,"gid")) {
-			if (!value || !*value)
-				return 1;
-			*gid = simple_strtoul(value,&value,0);
-			if (*value)
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_fd:
+			if (match_int(args, pipefd))
 				return 1;
-		}
-		else if (!strcmp(this_char,"pgrp")) {
-			if (!value || !*value)
+			break;
+		case Opt_uid:
+			if (match_int(args, &option))
 				return 1;
-			*pgrp = simple_strtoul(value,&value,0);
-			if (*value)
+			*uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
 				return 1;
-		}
-		else if (!strcmp(this_char,"minproto")) {
-			if (!value || !*value)
+			*gid = option;
+			break;
+		case Opt_pgrp:
+			if (match_int(args, &option))
 				return 1;
-			*minproto = simple_strtoul(value,&value,0);
-			if (*value)
+			*pgrp = option;
+			break;
+		case Opt_minproto:
+			if (match_int(args, &option))
 				return 1;
-		}
-		else if (!strcmp(this_char,"maxproto")) {
-			if (!value || !*value)
+			*minproto = option;
+			break;
+		case Opt_maxproto:
+			if (match_int(args, &option))
 				return 1;
-			*maxproto = simple_strtoul(value,&value,0);
-			if (*value)
+			*maxproto = option;
+			break;
+		default:
 			return 1;
 		}
-		else break;
 	}
 	return (*pipefd < 0);
 }

fs/befs/linuxvfs.c

@@ -13,6 +13,7 @@
 #include <linux/nls.h>
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>
+#include <linux/parser.h>
 
 #include "befs.h"
 #include "btree.h"
@@ -667,12 +668,27 @@ befs_nls2utf(struct super_block *sb, const char *in,
 	return -EILSEQ;
 }
 
+/**
+ * Use the
+ *
+ */
+enum {
+	Opt_uid, Opt_gid, Opt_charset, Opt_debug,
+};
+
+static match_table_t befs_tokens = {
+	{Opt_uid, "uid=%d"},
+	{Opt_gid, "gid=%d"},
+	{Opt_charset, "iocharset=%s"},
+	{Opt_debug, "debug"}
+};
+
 static int
 parse_options(char *options, befs_mount_options * opts)
 {
-	char *this_char;
-	char *value;
-	int ret = 1;
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
 
 	/* Initialize options */
 	opts->uid = 0;
@@ -683,64 +699,56 @@ parse_options(char *options, befs_mount_options * opts)
 	opts->debug = 0;
 
 	if (!options)
-		return ret;
-
-	while ((this_char = strsep(&options, ",")) != NULL) {
+		return 1;
 
-		if ((value = strchr(this_char, '=')) != NULL)
-			*value++ = 0;
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		if (!*p)
+			continue;
 
-		if (!strcmp(this_char, "uid")) {
-			if (!value || !*value) {
-				ret = 0;
-			} else {
-				opts->uid = simple_strtoul(value, &value, 0);
-				opts->use_uid = 1;
-				if (*value) {
-					printk(KERN_ERR "BEFS: Invalid uid "
-					       "option: %s\n", value);
-					ret = 0;
+		token = match_token(p, befs_tokens, args);
+		switch (token) {
+		case Opt_uid:
+			if (match_int(&args[0], &option))
+				return 0;
+			if (option < 0) {
+				printk(KERN_ERR "BeFS: Invalid uid %d, "
+						"using default\n", option);
+				break;
 			}
+			opts->uid = option;
+			opts->use_uid = 1;
+			break;
+		case Opt_gid:
+			if (match_int(&args[0], &option))
+				return 0;
+			if (option < 0) {
+				printk(KERN_ERR "BeFS: Invalid gid %d, "
+						"using default\n", option);
+				break;
 			}
-		} else if (!strcmp(this_char, "gid")) {
-			if (!value || !*value)
-				ret = 0;
-			else {
-				opts->gid = simple_strtoul(value, &value, 0);
+			opts->gid = option;
 			opts->use_gid = 1;
-				if (*value) {
-					printk(KERN_ERR
-					       "BEFS: Invalid gid option: "
-					       "%s\n", value);
-					ret = 0;
-				}
-			}
-		} else if (!strcmp(this_char, "iocharset") && value) {
-			char *p = value;
-			int len;
-
-			while (*value && *value != ',')
-				value++;
-			len = value - p;
-			if (len) {
-				char *buffer = kmalloc(len + 1, GFP_NOFS);
-				if (buffer) {
-					opts->iocharset = buffer;
-					memcpy(buffer, p, len);
-					buffer[len] = 0;
-
-				} else {
-					printk(KERN_ERR "BEFS: "
-					       "cannot allocate memory\n");
-					ret = 0;
-				}
+			break;
+		case Opt_charset:
+			kfree(opts->iocharset);
+			opts->iocharset = match_strdup(&args[0]);
+			if (!opts->iocharset) {
+				printk(KERN_ERR "BeFS: allocation failure for "
+						"iocharset string\n");
+				return 0;
 			}
-		} else if (!strcmp(this_char, "debug")) {
+			break;
+		case Opt_debug:
 			opts->debug = 1;
+			break;
+		default:
+			printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
+					"or missing value\n", p);
+			return 0;
 		}
 	}
-
-	return ret;
+	return 1;
 }
 
 /* This function has the responsibiltiy of getting the

fs/ext2/super.c

@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
+#include <linux/parser.h>
 #include <linux/random.h>
 #include <linux/buffer_head.h>
 #include <linux/smp_lock.h>
@@ -265,149 +266,157 @@ static unsigned long get_sb_block(void **data)
 	return sb_block;
 }
 
-static int want_value(char *value, char *option)
-{
-	if (!value || !*value) {
-		printk(KERN_NOTICE "EXT2-fs: the %s option needs an argument\n",
-		       option);
-		return -1;
-	}
-	return 0;
-}
-
-static int want_null_value(char *value, char *option)
-{
-	if (*value) {
-		printk(KERN_NOTICE "EXT2-fs: Invalid %s argument: %s\n",
-		       option, value);
-		return -1;
-	}
-	return 0;
-}
+enum {
+	Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
+	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
+	Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, Opt_nobh,
+	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
+	Opt_ignore, Opt_err,
+};
 
-static int want_numeric(char *value, char *option, unsigned long *number)
-{
-	if (want_value(value, option))
-		return -1;
-	*number = simple_strtoul(value, &value, 0);
-	if (want_null_value(value, option))
-		return -1;
-	return 0;
-}
+static match_table_t tokens = {
+	{Opt_bsd_df, "bsddf"},
+	{Opt_minix_df, "minixdf"},
+	{Opt_grpid, "grpid"},
+	{Opt_grpid, "bsdgroups"},
+	{Opt_nogrpid, "nogrpid"},
+	{Opt_nogrpid, "sysvgroups"},
+	{Opt_resgid, "resgid=%d"},
+	{Opt_resuid, "resuid=%d"},
+	{Opt_sb, "sb=%d"},
+	{Opt_err_cont, "errors=continue"},
+	{Opt_err_panic, "errors=panic"},
+	{Opt_err_ro, "errors=remount-ro"},
+	{Opt_nouid32, "nouid32"},
+	{Opt_nocheck, "check=none"},
+	{Opt_nocheck, "nocheck"},
+	{Opt_check, "check"},
+	{Opt_debug, "debug"},
+	{Opt_oldalloc, "oldalloc"},
+	{Opt_orlov, "orlov"},
+	{Opt_nobh, "nobh"},
+	{Opt_user_xattr, "user_xattr"},
+	{Opt_nouser_xattr, "nouser_xattr"},
+	{Opt_acl, "acl"},
+	{Opt_noacl, "noacl"},
+	{Opt_ignore, "grpquota"},
+	{Opt_ignore, "noquota"},
+	{Opt_ignore, "quota"},
+	{Opt_ignore, "usrquota"},
+	{Opt_err, NULL}
+};
 
-/*
- * This function has been shamelessly adapted from the msdos fs
- */
 static int parse_options (char * options,
 			  struct ext2_sb_info *sbi)
 {
-	char * this_char;
-	char * value;
+	char * p;
+	substring_t args[MAX_OPT_ARGS];
+	unsigned long kind = EXT2_MOUNT_ERRORS_CONT;
+	int option;
 
 	if (!options)
 		return 1;
-	while ((this_char = strsep (&options, ",")) != NULL) {
-		if (!*this_char)
+
+	while ((p = strsep (&options, ",")) != NULL) {
+		int token;
+		if (!*p)
 			continue;
-		if ((value = strchr (this_char, '=')) != NULL)
-			*value++ = 0;
-#ifdef CONFIG_EXT2_FS_XATTR
-		if (!strcmp (this_char, "user_xattr"))
-			set_opt (sbi->s_mount_opt, XATTR_USER);
-		else if (!strcmp (this_char, "nouser_xattr"))
-			clear_opt (sbi->s_mount_opt, XATTR_USER);
-		else
-#endif
-#ifdef CONFIG_EXT2_FS_POSIX_ACL
-		if (!strcmp(this_char, "acl"))
-			set_opt(sbi->s_mount_opt, POSIX_ACL);
-		else if (!strcmp(this_char, "noacl"))
-			clear_opt(sbi->s_mount_opt, POSIX_ACL);
-		else
-#endif
-		if (!strcmp (this_char, "bsddf"))
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_bsd_df:
 			clear_opt (sbi->s_mount_opt, MINIX_DF);
-		else if (!strcmp (this_char, "nouid32")) {
+			break;
+		case Opt_minix_df:
+			set_opt (sbi->s_mount_opt, MINIX_DF);
+			break;
+		case Opt_grpid:
+			set_opt (sbi->s_mount_opt, GRPID);
+			break;
+		case Opt_nogrpid:
+			clear_opt (sbi->s_mount_opt, GRPID);
+			break;
+		case Opt_resuid:
+			if (match_int(&args[0], &option))
+				return 0;
+			sbi->s_resuid = option;
+			break;
+		case Opt_resgid:
+			if (match_int(&args[0], &option))
+				return 0;
+			sbi->s_resgid = option;
+			break;
+		case Opt_sb:
+			/* handled by get_sb_block() instead of here */
+			/* *sb_block = match_int(&args[0]); */
+			break;
+		case Opt_err_panic:
+			kind = EXT2_MOUNT_ERRORS_PANIC;
+			break;
+		case Opt_err_ro:
+			kind = EXT2_MOUNT_ERRORS_RO;
+			break;
+		case Opt_err_cont:
+			kind = EXT2_MOUNT_ERRORS_CONT;
+			break;
+		case Opt_nouid32:
 			set_opt (sbi->s_mount_opt, NO_UID32);
-		}
-		else if (!strcmp (this_char, "check")) {
-			if (!value || !*value || !strcmp (value, "none"))
-				clear_opt (sbi->s_mount_opt, CHECK);
-			else
+			break;
+		case Opt_check:
 #ifdef CONFIG_EXT2_CHECK
 			set_opt (sbi->s_mount_opt, CHECK);
 #else
 			printk("EXT2 Check option not supported\n");
 #endif
-		}
-		else if (!strcmp (this_char, "debug"))
-			set_opt (sbi->s_mount_opt, DEBUG);
-		else if (!strcmp (this_char, "errors")) {
-			if (!value || !*value) {
-				printk ("EXT2-fs: the errors option requires "
-					"an argument\n");
-				return 0;
-			}
-			if (!strcmp (value, "continue")) {
-				clear_opt (sbi->s_mount_opt, ERRORS_RO);
-				clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
-				set_opt (sbi->s_mount_opt, ERRORS_CONT);
-			}
-			else if (!strcmp (value, "remount-ro")) {
-				clear_opt (sbi->s_mount_opt, ERRORS_CONT);
-				clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
-				set_opt (sbi->s_mount_opt, ERRORS_RO);
-			}
-			else if (!strcmp (value, "panic")) {
-				clear_opt (sbi->s_mount_opt, ERRORS_CONT);
-				clear_opt (sbi->s_mount_opt, ERRORS_RO);
-				set_opt (sbi->s_mount_opt, ERRORS_PANIC);
-			}
-			else {
-				printk ("EXT2-fs: Invalid errors option: %s\n",
-					value);
-				return 0;
-			}
-		}
-		else if (!strcmp (this_char, "grpid") ||
-			 !strcmp (this_char, "bsdgroups"))
-			set_opt (sbi->s_mount_opt, GRPID);
-		else if (!strcmp (this_char, "minixdf"))
-			set_opt (sbi->s_mount_opt, MINIX_DF);
-		else if (!strcmp (this_char, "nocheck"))
+			break;
+		case Opt_nocheck:
 			clear_opt (sbi->s_mount_opt, CHECK);
-		else if (!strcmp (this_char, "nogrpid") ||
-			 !strcmp (this_char, "sysvgroups"))
-			clear_opt (sbi->s_mount_opt, GRPID);
-		else if (!strcmp (this_char, "resgid")) {
-			unsigned long v;
-			if (want_numeric(value, "resgid", &v))
-				return 0;
-			sbi->s_resgid = v;
-		}
-		else if (!strcmp (this_char, "resuid")) {
-			unsigned long v;
-			if (want_numeric(value, "resuid", &v))
-				return 0;
-			sbi->s_resuid = v;
-		}
-		else if (!strcmp (this_char, "oldalloc"))
+			break;
+		case Opt_debug:
+			set_opt (sbi->s_mount_opt, DEBUG);
+			break;
+		case Opt_oldalloc:
 			set_opt (sbi->s_mount_opt, OLDALLOC);
-		else if (!strcmp (this_char, "orlov"))
+			break;
+		case Opt_orlov:
 			clear_opt (sbi->s_mount_opt, OLDALLOC);
-		else if (!strcmp (this_char, "nobh"))
-			set_opt(sbi->s_mount_opt, NOBH);
-		/* Silently ignore the quota options */
-		else if (!strcmp (this_char, "grpquota")
-		         || !strcmp (this_char, "noquota")
-		         || !strcmp (this_char, "quota")
-		         || !strcmp (this_char, "usrquota"))
-			/* Don't do anything ;-) */ ;
-		else {
-			printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
+			break;
+		case Opt_nobh:
+			set_opt (sbi->s_mount_opt, NOBH);
+			break;
+#ifdef CONFIG_EXT2_FS_XATTR
+		case Opt_user_xattr:
+			set_opt (sbi->s_mount_opt, XATTR_USER);
+			break;
+		case Opt_nouser_xattr:
+			clear_opt (sbi->s_mount_opt, XATTR_USER);
+			break;
+#else
+		case Opt_user_xattr:
+		case Opt_nouser_xattr:
+			printk("EXT2 (no)user_xattr options not supported\n");
+			break;
+#endif
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+		case Opt_acl:
+			set_opt(sbi->s_mount_opt, POSIX_ACL);
+			break;
+		case Opt_noacl:
+			clear_opt(sbi->s_mount_opt, POSIX_ACL);
+			break;
+#else
+		case Opt_acl:
+		case Opt_noacl:
+			printk("EXT2 (no)acl options not supported\n");
+			break;
+#endif
+		case Opt_ignore:
+			break;
+		default:
 			return 0;
 		}
 	}
+	sbi->s_mount_opt |= kind;
 	return 1;
 }
 

fs/hfs/super.c

@@ -31,6 +31,7 @@
 #include <linux/blkdev.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/parser.h>
 #include <linux/smp_lock.h>
 #include <linux/vfs.h>
 
@@ -211,6 +212,60 @@ static int hfs_statfs(struct super_block *sb, struct kstatfs *buf)
 	return 0;
 }
 
+enum {
+	Opt_version, Opt_uid, Opt_gid, Opt_umask, Opt_part,
+	Opt_type, Opt_creator, Opt_quiet, Opt_afpd,
+	Opt_names_netatalk, Opt_names_trivial, Opt_names_alpha, Opt_names_latin,
+	Opt_names_7bit, Opt_names_8bit, Opt_names_cap,
+	Opt_fork_netatalk, Opt_fork_single, Opt_fork_double, Opt_fork_cap,
+	Opt_case_lower, Opt_case_asis,
+	Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
+};
+
+static match_table_t tokens = {
+	{Opt_version, "version=%u"},
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_umask, "umask=%o"},
+	{Opt_part, "part=%u"},
+	{Opt_type, "type=%s"},
+	{Opt_creator, "creator=%s"},
+	{Opt_quiet, "quiet"},
+	{Opt_afpd, "afpd"},
+	{Opt_names_netatalk, "names=netatalk"},
+	{Opt_names_trivial, "names=trivial"},
+	{Opt_names_alpha, "names=alpha"},
+	{Opt_names_latin, "names=latin"},
+	{Opt_names_7bit, "names=7bit"},
+	{Opt_names_8bit, "names=8bit"},
+	{Opt_names_cap, "names=cap"},
+	{Opt_names_netatalk, "names=n"},
+	{Opt_names_trivial, "names=t"},
+	{Opt_names_alpha, "names=a"},
+	{Opt_names_latin, "names=l"},
+	{Opt_names_7bit, "names=7"},
+	{Opt_names_8bit, "names=8"},
+	{Opt_names_cap, "names=c"},
+	{Opt_fork_netatalk, "fork=netatalk"},
+	{Opt_fork_single, "fork=single"},
+	{Opt_fork_double, "fork=double"},
+	{Opt_fork_cap, "fork=cap"},
+	{Opt_fork_netatalk, "fork=n"},
+	{Opt_fork_single, "fork=s"},
+	{Opt_fork_double, "fork=d"},
+	{Opt_fork_cap, "fork=c"},
+	{Opt_case_lower, "case=lower"},
+	{Opt_case_asis, "case=asis"},
+	{Opt_case_lower, "case=l"},
+	{Opt_case_asis, "case=a"},
+	{Opt_conv_binary, "conv=binary"},
+	{Opt_conv_text, "conv=text"},
+	{Opt_conv_auto, "conv=auto"},
+	{Opt_conv_binary, "conv=b"},
+	{Opt_conv_text, "conv=t"},
+	{Opt_conv_auto, "conv=a"},
+};
+
 /*
  * parse_options()
  * 
@@ -219,8 +274,10 @@ static int hfs_statfs(struct super_block *sb, struct kstatfs *buf)
  */
 static int parse_options(char *options, struct hfs_sb_info *hsb, int *part)
 {
-	char *this_char, *value;
+	char *p;
 	char names, fork;
+	substring_t args[MAX_OPT_ARGS];
+	int option;
 
 	/* initialize the sb with defaults */
 	memset(hsb, 0, sizeof(*hsb));
@@ -243,117 +300,109 @@ static int parse_options(char *options, struct hfs_sb_info *hsb, int *part)
 	if (!options) {
 		goto done;
 	}
-	while ((this_char = strsep(&options,",")) != NULL) {
-		if (!*this_char)
+	while ((p = strsep(&options,",")) != NULL) {
+		int token;
+		if (!*p)
 			continue;
-		if ((value = strchr(this_char,'=')) != NULL) {
-			*value++ = 0;
-		}
+
+		token = match_token(p, tokens, args);
+		switch (token) {
 		/* Numeric-valued options */
-		if (!strcmp(this_char, "version")) {
-			if (!value || !*value) {
-				return 0;
-			}
-			hsb->s_version = simple_strtoul(value,&value,0);
-			if (*value) {
-				return 0;
-			}
-		} else if (!strcmp(this_char,"uid")) {
-			if (!value || !*value) {
-				return 0;
-			}
-			hsb->s_uid = simple_strtoul(value,&value,0);
-			if (*value) {
-				return 0;
-			}
-		} else if (!strcmp(this_char,"gid")) {
-			if (!value || !*value) {
-				return 0;
-			}
-			hsb->s_gid = simple_strtoul(value,&value,0);
-			if (*value) {
+		case Opt_version:
+			if (match_int(&args[0], &option))
 				return 0;
-			}
-		} else if (!strcmp(this_char,"umask")) {
-			if (!value || !*value) {
+			hsb->s_version = option;
+			break;
+		case Opt_uid:
+			if (match_int(&args[0], &option))
 				return 0;
-			}
-			hsb->s_umask = simple_strtoul(value,&value,8);
-			if (*value) {
+			hsb->s_uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(&args[0], &option))
 				return 0;
-			}
-		} else if (!strcmp(this_char,"part")) {
-			if (!value || !*value) {
+			hsb->s_gid = option;
+			break;
+		case Opt_umask:
+			if (match_octal(&args[0], &option))
 				return 0;
-			}
-			*part = simple_strtoul(value,&value,0);
-			if (*value) {
+			hsb->s_umask = option;
+			break;
+		case Opt_part:
+			if (match_int(&args[0], &option))
 				return 0;
-			}
+			*part = option;
+			break;
 		/* String-valued options */
-		} else if (!strcmp(this_char,"type") && value) {
-			if (strlen(value) != 4) {
+		case Opt_type:
+			if (strlen(args[0].from) != 4) {
 				return 0;
 			}
-			hsb->s_type = hfs_get_nl(value);
-		} else if (!strcmp(this_char,"creator") && value) {
-			if (strlen(value) != 4) {
+			hsb->s_type = hfs_get_nl(args[0].from);
+			break;
+		case Opt_creator:
+			if (strlen(args[0].from) != 4) {
 				return 0;
 			}
-			hsb->s_creator = hfs_get_nl(value);
+			hsb->s_creator = hfs_get_nl(args[0].from);
+			break;
 		/* Boolean-valued options */
-		} else if (!strcmp(this_char,"quiet")) {
-			if (value) {
-				return 0;
-			}
+		case Opt_quiet:
 			hsb->s_quiet = 1;
-		} else if (!strcmp(this_char,"afpd")) {
-			if (value) {
-				return 0;
-			}
+			break;
+		case Opt_afpd:
 			hsb->s_afpd = 1;
+			break;
 		/* Multiple choice options */
-		} else if (!strcmp(this_char,"names") && value) {
-			if ((*value && !value[1] && strchr("ntal78c",*value)) ||
-			    !strcmp(value,"netatalk") ||
-			    !strcmp(value,"trivial") ||
-			    !strcmp(value,"alpha") ||
-			    !strcmp(value,"latin") ||
-			    !strcmp(value,"7bit") ||
-			    !strcmp(value,"8bit") ||
-			    !strcmp(value,"cap")) {
-				names = *value;
-			} else {
-				return 0;
-			}
-		} else if (!strcmp(this_char,"fork") && value) {
-			if ((*value && !value[1] && strchr("nsdc",*value)) ||
-			    !strcmp(value,"netatalk") ||
-			    !strcmp(value,"single") ||
-			    !strcmp(value,"double") ||
-			    !strcmp(value,"cap")) {
-				fork = *value;
-			} else {
-				return 0;
-			}
-		} else if (!strcmp(this_char,"case") && value) {
-			if ((*value && !value[1] && strchr("la",*value)) ||
-			    !strcmp(value,"lower") ||
-			    !strcmp(value,"asis")) {
-				hsb->s_lowercase = (*value == 'l');
-			} else {
-				return 0;
-			}
-		} else if (!strcmp(this_char,"conv") && value) {
-			if ((*value && !value[1] && strchr("bta",*value)) ||
-			    !strcmp(value,"binary") ||
-			    !strcmp(value,"text") ||
-			    !strcmp(value,"auto")) {
-				hsb->s_conv = *value;
-			} else {
-				return 0;
-			}
-		} else {
+		case Opt_names_netatalk:
+			names = 'n';
+			break;
+		case Opt_names_trivial:
+			names = 't';
+			break;
+		case Opt_names_alpha:
+			names = 'a';
+			break;
+		case Opt_names_latin:
+			names = 'l';
+			break;
+		case Opt_names_7bit:
+			names = '7';
+			break;
+		case Opt_names_8bit:
+			names = '8';
+			break;
+		case Opt_names_cap:
+			names = 'c';
+			break;
+		case Opt_fork_netatalk:
+			fork = 'n';
+			break;
+		case Opt_fork_single:
+			fork = 's';
+			break;
+		case Opt_fork_double:
+			fork = 'd';
+			break;
+		case Opt_fork_cap:
+			fork = 'c';
+			break;
+		case Opt_case_lower:
+			hsb->s_lowercase = 1;
+			break;
+		case Opt_case_asis:
+			hsb->s_lowercase = 0;
+			break;
+		case Opt_conv_binary:
+			hsb->s_conv = 'b';
+			break;
+		case Opt_conv_text:
+			hsb->s_conv = 't';
+			break;
+		case Opt_conv_auto:
+			hsb->s_conv = 'a';
+			break;
+		default:
 			return 0;
 		}
 	}

fs/hpfs/super.c

@@ -10,6 +10,7 @@
 #include <linux/string.h>
 #include "hpfs_fn.h"
 #include <linux/module.h>
+#include <linux/parser.h>
 #include <linux/init.h>
 #include <linux/vfs.h>
 
@@ -219,15 +220,52 @@ static struct super_operations hpfs_sops =
 
 /*
  * A tiny parser for option strings, stolen from dosfs.
- *
  * Stolen again from read-only hpfs.
+ * And updated for table-driven option parsing.
  */
 
+enum {
+	Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
+	Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
+	Opt_check_none, Opt_check_normal, Opt_check_strict,
+	Opt_err_cont, Opt_err_ro, Opt_err_panic,
+	Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
+	Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
+	Opt_timeshift, Opt_err,
+};
+
+static match_table_t tokens = {
+	{Opt_help, "help"},
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_umask, "umask=%o"},
+	{Opt_case_lower, "case=lower"},
+	{Opt_case_asis, "case=asis"},
+	{Opt_conv_binary, "conv=binary"},
+	{Opt_conv_text, "conv=text"},
+	{Opt_conv_auto, "conv=auto"},
+	{Opt_check_none, "check=none"},
+	{Opt_check_normal, "check=normal"},
+	{Opt_check_strict, "check=strict"},
+	{Opt_err_cont, "errors=continue"},
+	{Opt_err_ro, "errors=remount-ro"},
+	{Opt_err_panic, "errors=panic"},
+	{Opt_eas_no, "eas=no"},
+	{Opt_eas_ro, "eas=ro"},
+	{Opt_eas_rw, "eas=rw"},
+	{Opt_chkdsk_no, "chkdsk=no"},
+	{Opt_chkdsk_errors, "chkdsk=errors"},
+	{Opt_chkdsk_always, "chkdsk=always"},
+	{Opt_timeshift, "timeshift=%d"},
+	{Opt_err, NULL},
+};
+
 int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 	       int *lowercase, int *conv, int *eas, int *chk, int *errs,
 	       int *chkdsk, int *timeshift)
 {
-	char *p, *rhs;
+	char *p;
+	int option;
 
 	if (!opts)
 		return 1;
@@ -235,115 +273,98 @@ int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
 	/*printk("Parsing opts: '%s'\n",opts);*/
 
 	while ((p = strsep(&opts, ",")) != NULL) {
+		substring_t args[MAX_OPT_ARGS];
+		int token;
 		if (!*p)
 			continue;
-		if ((rhs = strchr(p, '=')) != 0)
-			*rhs++ = '\0';
-		if (!strcmp(p, "help")) return 2;
-		if (!strcmp(p, "uid")) {
-			if (!rhs || !*rhs)
-				return 0;
-			*uid = simple_strtoul(rhs, &rhs, 0);
-			if (*rhs)
-				return 0;
-		}
-		else if (!strcmp(p, "gid")) {
-			if (!rhs || !*rhs)
-				return 0;
-			*gid = simple_strtoul(rhs, &rhs, 0);
-			if (*rhs)
-				return 0;
-		}
-		else if (!strcmp(p, "umask")) {
-			if (!rhs || !*rhs)
-				return 0;
-			*umask = simple_strtoul(rhs, &rhs, 8);
-			if (*rhs)
-				return 0;
-		}
-		else if (!strcmp(p, "timeshift")) {
-			int m = 1;
-			if (!rhs || !*rhs)
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_help:
+			return 2;
+		case Opt_uid:
+			if (match_int(args, &option))
 				return 0;
-			if (*rhs == '-') m = -1;
-			if (*rhs == '+' || *rhs == '-') rhs++;
-			*timeshift = simple_strtoul(rhs, &rhs, 0) * m;
-			if (*rhs)
+			*uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
 				return 0;
-		}
-		else if (!strcmp(p, "case")) {
-			if (!rhs || !*rhs)
+			*gid = option;
+			break;
+		case Opt_umask:
+			if (match_octal(args, &option))
 				return 0;
-			if (!strcmp(rhs, "lower"))
+			*umask = option;
+			break;
+		case Opt_case_lower:
 			*lowercase = 1;
-			else if (!strcmp(rhs, "asis"))
+			break;
+		case Opt_case_asis:
 			*lowercase = 0;
-			else
-				return 0;
-		}
-		else if (!strcmp(p, "conv")) {
-			if (!rhs || !*rhs)
-				return 0;
-			if (!strcmp(rhs, "binary"))
+			break;
+		case Opt_conv_binary:
 			*conv = CONV_BINARY;
-			else if (!strcmp(rhs, "text"))
+			break;
+		case Opt_conv_text:
 			*conv = CONV_TEXT;
-			else if (!strcmp(rhs, "auto"))
+			break;
+		case Opt_conv_auto:
 			*conv = CONV_AUTO;
-			else
-				return 0;
-		}
-		else if (!strcmp(p, "check")) {
-			if (!rhs || !*rhs)
-				return 0;
-			if (!strcmp(rhs, "none"))
+			break;
+		case Opt_check_none:
 			*chk = 0;
-			else if (!strcmp(rhs, "normal"))
+			break;
+		case Opt_check_normal:
 			*chk = 1;
-			else if (!strcmp(rhs, "strict"))
+			break;
+		case Opt_check_strict:
 			*chk = 2;
-			else
-				return 0;
-		}
-		else if (!strcmp(p, "errors")) {
-			if (!rhs || !*rhs)
-				return 0;
-			if (!strcmp(rhs, "continue"))
+			break;
+		case Opt_err_cont:
 			*errs = 0;
-			else if (!strcmp(rhs, "remount-ro"))
+			break;
+		case Opt_err_ro:
 			*errs = 1;
-			else if (!strcmp(rhs, "panic"))
+			break;
+		case Opt_err_panic:
 			*errs = 2;
-			else
-				return 0;
-		}
-		else if (!strcmp(p, "eas")) {
-			if (!rhs || !*rhs)
-				return 0;
-			if (!strcmp(rhs, "no"))
+			break;
+		case Opt_eas_no:
 			*eas = 0;
-			else if (!strcmp(rhs, "ro"))
+			break;
+		case Opt_eas_ro:
 			*eas = 1;
-			else if (!strcmp(rhs, "rw"))
+			break;
+		case Opt_eas_rw:
 			*eas = 2;
-			else
-				return 0;
-		}
-		else if (!strcmp(p, "chkdsk")) {
-			if (!rhs || !*rhs)
-				return 0;
-			if (!strcmp(rhs, "no"))
+			break;
+		case Opt_chkdsk_no:
 			*chkdsk = 0;
-			else if (!strcmp(rhs, "errors"))
+			break;
+		case Opt_chkdsk_errors:
 			*chkdsk = 1;
-			else if (!strcmp(rhs, "always"))
+			break;
+		case Opt_chkdsk_always:
 			*chkdsk = 2;
-			else
+			break;
+		case Opt_timeshift:
+		{
+			int m = 1;
+			char *rhs = args[0].from;
+			if (!rhs || !*rhs)
 				return 0;
+			if (*rhs == '-') m = -1;
+			if (*rhs == '+' || *rhs == '-') rhs++;
+			*timeshift = simple_strtoul(rhs, &rhs, 0) * m;
+			if (*rhs)
+				return 0;
+			break;
 		}
-		else
+		default:
 			return 0;
 		}
+	}
 	return 1;
 }
 

fs/isofs/inode.c

@@ -29,6 +29,7 @@
 #include <linux/blkdev.h>
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>
+#include <linux/parser.h>
 #include <asm/system.h>
 #include <asm/uaccess.h>
 
@@ -328,9 +329,52 @@ isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
 }
 #endif
 
+enum {
+	Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
+	Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
+	Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
+	Opt_nocompress,
+};
+
+static match_table_t tokens = {
+	{Opt_norock, "norock"},
+	{Opt_nojoliet, "nojoliet"},
+	{Opt_unhide, "unhide"},
+	{Opt_cruft, "cruft"},
+	{Opt_utf8, "utf8"},
+	{Opt_iocharset, "iocharset=%s"},
+	{Opt_map_a, "map=acorn"},
+	{Opt_map_a, "map=a"},
+	{Opt_map_n, "map=normal"},
+	{Opt_map_n, "map=n"},
+	{Opt_map_o, "map=off"},
+	{Opt_map_o, "map=o"},
+	{Opt_session, "session=%u"},
+	{Opt_sb, "sbsector=%u"},
+	{Opt_check_r, "check=relaxed"},
+	{Opt_check_r, "check=r"},
+	{Opt_check_s, "check=strict"},
+	{Opt_check_s, "check=s"},
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_mode, "mode=%u"},
+	{Opt_block, "block=%u"},
+	{Opt_ignore, "conv=binary"},
+	{Opt_ignore, "conv=b"},
+	{Opt_ignore, "conv=text"},
+	{Opt_ignore, "conv=t"},
+	{Opt_ignore, "conv=mtext"},
+	{Opt_ignore, "conv=m"},
+	{Opt_ignore, "conv=auto"},
+	{Opt_ignore, "conv=a"},
+	{Opt_nocompress, "nocompress"},
+	{Opt_err, NULL}
+};
+
 static int parse_options(char *options, struct iso9660_options * popt)
 {
-	char *this_char,*value;
+	char *p;
+	int option;
 
 	popt->map = 'n';
 	popt->rock = 'y';
@@ -350,113 +394,102 @@ static int parse_options(char *options, struct iso9660_options * popt)
 	popt->utf8 = 0;
 	popt->session=-1;
 	popt->sbsector=-1;
-	if (!options) return 1;
-	while ((this_char = strsep(&options,",")) != NULL) {
-		if (!*this_char)
+	if (!options)
+		return 1;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		int token;
+		substring_t args[MAX_OPT_ARGS];
+		unsigned n;
+
+		if (!*p)
 			continue;
-	        if (strncmp(this_char,"norock",6) == 0) {
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_norock:
 			popt->rock = 'n';
-		  continue;
-		}
-	        if (strncmp(this_char,"nojoliet",8) == 0) {
+			break;
+		case Opt_nojoliet:
 			popt->joliet = 'n';
-		  continue;
-		}
-	        if (strncmp(this_char,"unhide",6) == 0) {
+			break;
+		case Opt_unhide:
 			popt->unhide = 'y';
-		  continue;
-		}
-	        if (strncmp(this_char,"cruft",5) == 0) {
+			break;
+		case Opt_cruft:
 			popt->cruft = 'y';
-		  continue;
-		}
-	        if (strncmp(this_char,"utf8",4) == 0) {
+			break;
+		case Opt_utf8:
 			popt->utf8 = 1;
-		  continue;
-		}
-	        if (strncmp(this_char,"nocompress",10) == 0) {
-		  popt->nocompress = 1;
-		  continue;
-		}
-		if ((value = strchr(this_char,'=')) != NULL)
-			*value++ = 0;
-
+			break;
 #ifdef CONFIG_JOLIET
-		if (!strcmp(this_char,"iocharset") && value) {
-			popt->iocharset = value;
-			while (*value && *value != ',')
-				value++;
-			if (value == popt->iocharset)
-				return 0;
-			*value = 0;
-		} else
+		case Opt_iocharset:
+			popt->iocharset = match_strdup(&args[0]);
+			break;
 #endif
-		if (!strcmp(this_char,"map") && value) {
-			if (value[0] && !value[1] && strchr("ano",*value))
-				popt->map = *value;
-			else if (!strcmp(value,"off")) popt->map = 'o';
-			else if (!strcmp(value,"normal")) popt->map = 'n';
-			else if (!strcmp(value,"acorn")) popt->map = 'a';
-			else return 0;
-		}
-		if (!strcmp(this_char,"session") && value) {
-			char * vpnt = value;
-			unsigned int ivalue = simple_strtoul(vpnt, &vpnt, 0);
-			if(ivalue < 0 || ivalue >99) return 0;
-			popt->session=ivalue+1;
-		}
-		if (!strcmp(this_char,"sbsector") && value) {
-			char * vpnt = value;
-			unsigned int ivalue = simple_strtoul(vpnt, &vpnt, 0);
-			if(ivalue < 0 || ivalue >660*512) return 0;
-			popt->sbsector=ivalue;
-		}
-		else if (!strcmp(this_char,"check") && value) {
-			if (value[0] && !value[1] && strchr("rs",*value))
-				popt->check = *value;
-			else if (!strcmp(value,"relaxed")) popt->check = 'r';
-			else if (!strcmp(value,"strict")) popt->check = 's';
-			else return 0;
-		}
-		else if (!strcmp(this_char,"conv") && value) {
-			/* no conversion is done anymore;
-			   we still accept the same mount options,
-			   but ignore them */
-			if (value[0] && !value[1] && strchr("btma",*value)) ;
-			else if (!strcmp(value,"binary")) ;
-			else if (!strcmp(value,"text")) ;
-			else if (!strcmp(value,"mtext")) ;
-			else if (!strcmp(value,"auto")) ;
-			else return 0;
-		}
-		else if (value &&
-			 (!strcmp(this_char,"block") ||
-			  !strcmp(this_char,"mode") ||
-			  !strcmp(this_char,"uid") ||
-			  !strcmp(this_char,"gid"))) {
-		  char * vpnt = value;
-		  unsigned int ivalue = simple_strtoul(vpnt, &vpnt, 0);
-		  if (*vpnt) return 0;
-		  switch(*this_char) {
-		  case 'b':
-		    if (   ivalue != 512
-			&& ivalue != 1024
-			&& ivalue != 2048) return 0;
-		    popt->blocksize = ivalue;
+		case Opt_map_a:
+			popt->map = 'a';
 			break;
-		  case 'u':
-		    popt->uid = ivalue;
+		case Opt_map_o:
+			popt->map = 'o';
 			break;
-		  case 'g':
-		    popt->gid = ivalue;
+		case Opt_map_n:
+			popt->map = 'n';
 			break;
-		  case 'm':
-		    popt->mode = ivalue;
+		case Opt_session:
+			if (match_int(&args[0], &option))
+				return 0;
+			n = option;
+			if (n > 99)
+				return 0;
+			popt->session = n + 1;
 			break;
+		case Opt_sb:
+			if (match_int(&args[0], &option))
+				return 0;
+			n = option;
+			if (n > 660 * 512)
+				return 0;
+			popt->sbsector = n;
+			break;
+		case Opt_check_r:
+			popt->check = 'r';
+			break;
+		case Opt_check_s:
+			popt->check = 's';
+			break;
+		case Opt_ignore:
+			break;
+		case Opt_uid:
+			if (match_int(&args[0], &option))
+				return 0;
+			popt->uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(&args[0], &option))
+				return 0;
+			popt->gid = option;
+			break;
+		case Opt_mode:
+			if (match_int(&args[0], &option))
+				return 0;
+			popt->mode = option;
+			break;
+		case Opt_block:
+			if (match_int(&args[0], &option))
+				return 0;
+			n = option;
+			if (n != 512 && n != 1024 && n != 2048)
+				return 0;
+			popt->blocksize = n;
+			break;
+		case Opt_nocompress:
+			popt->nocompress = 1;
+			break;
+		default:
+			return 0;
 		}
 	}
-		else return 1;
-	}
 	return 1;
 }
 
@@ -842,6 +875,9 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
 	if (opt.check == 'r') table++;
 	s->s_root->d_op = &isofs_dentry_ops[table];
 
+	if (opt.iocharset)
+		kfree(opt.iocharset);
+
 	return 0;
 
 	/*
@@ -879,6 +915,8 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
 out_freebh:
 	brelse(bh);
 out_freesbi:
+	if (opt.iocharset)
+		kfree(opt.iocharset);
 	kfree(sbi);
 	s->s_fs_info = NULL;
 	return -EINVAL;

fs/jfs/super.c

@@ -20,6 +20,7 @@
 #include <linux/fs.h>
 #include <linux/config.h>
 #include <linux/module.h>
+#include <linux/parser.h>
 #include <linux/completion.h>
 #include <linux/vfs.h>
 #include <asm/uaccess.h>
@@ -164,59 +165,82 @@ static void jfs_put_super(struct super_block *sb)
 	kfree(sbi);
 }
 
+enum {
+	Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
+	Opt_ignore, Opt_err,
+};
+
+static match_table_t tokens = {
+	{Opt_integrity, "integrity"},
+	{Opt_nointegrity, "nointegrity"},
+	{Opt_iocharset, "iocharset=%s"},
+	{Opt_resize, "resize=%u"},
+	{Opt_ignore, "noquota"},
+	{Opt_ignore, "quota"},
+	{Opt_ignore, "usrquota"},
+	{Opt_ignore, "grpquota"},
+	{Opt_err, NULL}
+};
+
 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 			 int *flag)
 {
 	void *nls_map = NULL;
-	char *this_char;
-	char *value;
+	char *p;
 	struct jfs_sb_info *sbi = JFS_SBI(sb);
 
 	*newLVSize = 0;
 
 	if (!options)
 		return 1;
-	while ((this_char = strsep(&options, ",")) != NULL) {
-		if (!*this_char)
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		substring_t args[MAX_OPT_ARGS];
+		int token;
+		if (!*p)
 			continue;
-		if ((value = strchr(this_char, '=')) != NULL)
-			*value++ = 0;
-		if (!strcmp(this_char, "integrity")) {
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_integrity:
 			*flag &= ~JFS_NOINTEGRITY;
-		} else 	if (!strcmp(this_char, "nointegrity")) {
+			break;
+		case Opt_nointegrity:
 			*flag |= JFS_NOINTEGRITY;
-		} else if (!strcmp(this_char, "iocharset")) {
-			if (!value || !*value)
-				goto needs_arg;
+			break;
+		case Opt_ignore:
+			/* Silently ignore the quota options */
+			/* Don't do anything ;-) */
+			break;
+		case Opt_iocharset:
 			if (nls_map)	/* specified iocharset twice! */
 				unload_nls(nls_map);
-			nls_map = load_nls(value);
+			nls_map = load_nls(args[0].from);
 			if (!nls_map) {
 				printk(KERN_ERR "JFS: charset not found\n");
 				goto cleanup;
 			}
-		} else if (!strcmp(this_char, "resize")) {
-			if (!value || !*value) {
+			break;
+		case Opt_resize:
+		{
+			char *resize = args[0].from;
+			if (!resize || !*resize) {
 				*newLVSize = sb->s_bdev->bd_inode->i_size >>
 					sb->s_blocksize_bits;
 				if (*newLVSize == 0)
 					printk(KERN_ERR
 					"JFS: Cannot determine volume size\n");
 			} else
-				*newLVSize = simple_strtoull(value, &value, 0);
-
-			/* Silently ignore the quota options */
-		} else if (!strcmp(this_char, "grpquota")
-			   || !strcmp(this_char, "noquota")
-			   || !strcmp(this_char, "quota")
-			   || !strcmp(this_char, "usrquota"))
-			/* Don't do anything ;-) */ ;
-		else {
-			printk("jfs: Unrecognized mount option %s\n",
-			       this_char);
+				*newLVSize = simple_strtoull(resize, &resize, 0);
+			break;
+		}
+		default:
+			printk("jfs: Unrecognized mount option \"%s\" "
+					" or missing value\n", p);
 			goto cleanup;
 		}
 	}
+
 	if (nls_map) {
 		/* Discard old (if remount) */
 		if (sbi->nls_tab)
@@ -224,8 +248,7 @@ static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 		sbi->nls_tab = nls_map;
 	}
 	return 1;
-needs_arg:
-	printk(KERN_ERR "JFS: %s needs an argument\n", this_char);
+
 cleanup:
 	if (nls_map)
 		unload_nls(nls_map);

fs/proc/inode.c

@@ -14,6 +14,7 @@
 #include <linux/limits.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/parser.h>
 #include <linux/smp_lock.h>
 
 #include <asm/system.h>
@@ -135,34 +136,47 @@ static struct super_operations proc_sops = {
 	.statfs		= simple_statfs,
 };
 
+enum {
+	Opt_uid, Opt_gid, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_uid, "uid=%u"},
+	{Opt_gid, "gid=%u"},
+	{Opt_err, NULL}
+};
+
 static int parse_options(char *options,uid_t *uid,gid_t *gid)
 {
-	char *this_char,*value;
+	char *p;
+	int option;
 
 	*uid = current->uid;
 	*gid = current->gid;
 	if (!options)
 		return 1;
-	while ((this_char = strsep(&options,",")) != NULL) {
-		if (!*this_char)
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		substring_t args[MAX_OPT_ARGS];
+		int token;
+		if (!*p)
 			continue;
-		if ((value = strchr(this_char,'=')) != NULL)
-			*value++ = 0;
-		if (!strcmp(this_char,"uid")) {
-			if (!value || !*value)
-				return 0;
-			*uid = simple_strtoul(value,&value,0);
-			if (*value)
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_uid:
+			if (match_int(args, &option))
 				return 0;
-		}
-		else if (!strcmp(this_char,"gid")) {
-			if (!value || !*value)
+			*uid = option;
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
 				return 0;
-			*gid = simple_strtoul(value,&value,0);
-			if (*value)
+			*gid = option;
+			break;
+		default:
 			return 0;
 		}
-		else return 1;
 	}
 	return 1;
 }

fs/udf/super.c

@@ -50,6 +50,7 @@
 #include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/parser.h>
 #include <linux/stat.h>
 #include <linux/cdrom.h>
 #include <linux/nls.h>
@@ -259,18 +260,53 @@ module_exit(exit_udf_fs)
  *	uopts		Pointer to mount options variable.
  *
  * POST-CONDITIONS
- *	<return>	0	Mount options parsed okay.
- *	<return>	-1	Error parsing mount options.
+ *	<return>	1	Mount options parsed okay.
+ *	<return>	0	Error parsing mount options.
  *
  * HISTORY
  *	July 1, 1997 - Andrew E. Mileski
  *	Written, tested, and released.
  */
 
+enum {
+	Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
+	Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
+	Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
+	Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
+	Opt_rootdir, Opt_utf8, Opt_iocharset,
+	Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_novrs, "novrs"},
+	{Opt_nostrict, "nostrict"},
+	{Opt_bs, "bs=%u"},
+	{Opt_unhide, "unhide"},
+	{Opt_undelete, "undelete"},
+	{Opt_noadinicb, "noadinicb"},
+	{Opt_adinicb, "adinicb"},
+	{Opt_shortad, "shortad"},
+	{Opt_longad, "longad"},
+	{Opt_gid, "gid=%u"},
+	{Opt_uid, "uid=%u"},
+	{Opt_umask, "umask=%o"},
+	{Opt_session, "session=%u"},
+	{Opt_lastblock, "lastblock=%u"},
+	{Opt_anchor, "anchor=%u"},
+	{Opt_volume, "volume=%u"},
+	{Opt_partition, "partition=%u"},
+	{Opt_fileset, "fileset=%u"},
+	{Opt_rootdir, "rootdir=%u"},
+	{Opt_utf8, "utf8"},
+	{Opt_iocharset, "iocharset=%s"},
+	{Opt_err, NULL}
+};
+
 static int
 udf_parse_options(char *options, struct udf_options *uopt)
 {
-	char *opt, *val;
+	char *p;
+	int option;
 
 	uopt->novrs = 0;
 	uopt->blocksize = 2048;
@@ -286,71 +322,106 @@ udf_parse_options(char *options, struct udf_options *uopt)
 	if (!options)
 		return 1;
 
-	while ((opt = strsep(&options, ",")) != NULL)
-	{
-		if (!*opt)
+	while ((p = strsep(&options, ",")) != NULL) {
+		substring_t args[MAX_OPT_ARGS];
+		int token;
+		if (!*p)
 			continue;
-		/* Make "opt=val" into two strings */
-		val = strchr(opt, '=');
-		if (val)
-			*(val++) = 0;
-		if (!strcmp(opt, "novrs") && !val)
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_novrs:
 			uopt->novrs = 1;
-		else if (!strcmp(opt, "bs") && val)
-			uopt->blocksize = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "unhide") && !val)
+			break;
+		case Opt_bs:
+			if (match_int(&args[0], &option))
+				return 0;
+			uopt->blocksize = option;
+			break;
+		case Opt_unhide:
 			uopt->flags |= (1 << UDF_FLAG_UNHIDE);
-		else if (!strcmp(opt, "undelete") && !val)
+			break;
+		case Opt_undelete:
 			uopt->flags |= (1 << UDF_FLAG_UNDELETE);
-		else if (!strcmp(opt, "noadinicb") && !val)
+			break;
+		case Opt_noadinicb:
 			uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
-		else if (!strcmp(opt, "adinicb") && !val)
+			break;
+		case Opt_adinicb:
 			uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
-		else if (!strcmp(opt, "shortad") && !val)
+			break;
+		case Opt_shortad:
 			uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
-		else if (!strcmp(opt, "longad") && !val)
+			break;
+		case Opt_longad:
 			uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
-		else if (!strcmp(opt, "gid") && val)
-			uopt->gid = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "umask") && val)
-			uopt->umask = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "nostrict") && !val)
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
+				return 0;
+			uopt->gid = option;
+			break;
+		case Opt_uid:
+			if (match_int(args, &option))
+				return 0;
+			uopt->uid = option;
+			break;
+		case Opt_umask:
+			if (match_octal(args, &option))
+				return 0;
+			uopt->umask = option;
+			break;
+		case Opt_nostrict:
 			uopt->flags &= ~(1 << UDF_FLAG_STRICT);
-		else if (!strcmp(opt, "uid") && val)
-			uopt->uid = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "session") && val)
-			uopt->session = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "lastblock") && val)
-			uopt->lastblock = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "anchor") && val)
-			uopt->anchor = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "volume") && val)
-			uopt->volume = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "partition") && val)
-			uopt->partition = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "fileset") && val)
-			uopt->fileset = simple_strtoul(val, NULL, 0);
-		else if (!strcmp(opt, "rootdir") && val)
-			uopt->rootdir = simple_strtoul(val, NULL, 0);
+			break;
+		case Opt_session:
+			if (match_int(args, &option))
+				return 0;
+			uopt->session = option;
+			break;
+		case Opt_lastblock:
+			if (match_int(args, &option))
+				return 0;
+			uopt->lastblock = option;
+			break;
+		case Opt_anchor:
+			if (match_int(args, &option))
+				return 0;
+			uopt->anchor = option;
+			break;
+		case Opt_volume:
+			if (match_int(args, &option))
+				return 0;
+			uopt->volume = option;
+			break;
+		case Opt_partition:
+			if (match_int(args, &option))
+				return 0;
+			uopt->partition = option;
+			break;
+		case Opt_fileset:
+			if (match_int(args, &option))
+				return 0;
+			uopt->fileset = option;
+			break;
+		case Opt_rootdir:
+			if (match_int(args, &option))
+				return 0;
+			uopt->rootdir = option;
+			break;
+		case Opt_utf8:
+			uopt->flags |= (1 << UDF_FLAG_UTF8);
+			break;
 #ifdef CONFIG_NLS
-		else if (!strcmp(opt, "iocharset") && val)
-		{
-			uopt->nls_map = load_nls(val);
+		case Opt_iocharset:
+			uopt->nls_map = load_nls(args[0].from);
 			uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
-		}
+			break;
 #endif
-		else if (!strcmp(opt, "utf8") && !val)
-			uopt->flags |= (1 << UDF_FLAG_UTF8);
-		else if (val)
-		{
-			printk(KERN_ERR "udf: bad mount option \"%s=%s\"\n",
-				opt, val);
-			return 0;
-		}
-		else
-		{
-			printk(KERN_ERR "udf: bad mount option \"%s\"\n",
-				opt);
+		default:
+			printk(KERN_ERR "udf: bad mount option \"%s\" "
+					"or missing value\n",
+				p);
 			return 0;
 		}
 	}

fs/ufs/super.c

@@ -79,6 +79,7 @@
 #include <linux/string.h>
 #include <linux/blkdev.h>
 #include <linux/init.h>
+#include <linux/parser.h>
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>
@@ -250,64 +251,99 @@ void ufs_warning (struct super_block * sb, const char * function,
 		sb->s_id, function, error_buf);
 }
 
+enum {
+	Opt_type_old, Opt_type_sunx86, Opt_type_sun, Opt_type_44bsd,
+	Opt_type_hp, Opt_type_nextstepcd, Opt_type_nextstep,
+	Opt_type_openstep, Opt_onerror_panic, Opt_onerror_lock,
+	Opt_onerror_umount, Opt_onerror_repair, Opt_err
+};
+
+static match_table_t tokens = {
+	{Opt_type_old, "ufstype=old"},
+	{Opt_type_sunx86, "ufstype=sunx86"},
+	{Opt_type_sun, "ufstype=sun"},
+	{Opt_type_44bsd, "ufstype=44bsd"},
+	{Opt_type_hp, "ufstype=hp"},
+	{Opt_type_nextstepcd, "ufstype=nextstep-cd"},
+	{Opt_type_nextstep, "ufstype=nextstep"},
+	{Opt_type_openstep, "ufstype=openstep"},
+	{Opt_onerror_panic, "onerror=panic"},
+	{Opt_onerror_lock, "onerror=lock"},
+	{Opt_onerror_umount, "onerror=umount"},
+	{Opt_onerror_repair, "onerror=repair"},
+	{Opt_err, NULL}
+};
+
 static int ufs_parse_options (char * options, unsigned * mount_options)
 {
-	char * this_char;
-	char * value;
+	char * p;
 	
 	UFSD(("ENTER\n"))
 	
 	if (!options)
 		return 1;
 
-	while ((this_char = strsep (&options, ",")) != NULL) {
-		if (!*this_char)
+	while ((p = strsep(&options, ",")) != NULL) {
+		substring_t args[MAX_OPT_ARGS];
+		int token;
+		if (!*p)
 			continue;
-		if ((value = strchr (this_char, '=')) != NULL)
-			*value++ = 0;
-		if (!strcmp (this_char, "ufstype")) {
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_type_old:
 			ufs_clear_opt (*mount_options, UFSTYPE);
-			if (!strcmp (value, "old"))
 			ufs_set_opt (*mount_options, UFSTYPE_OLD);
-			else if (!strcmp (value, "sun"))
+			break;
+		case Opt_type_sunx86:
+			ufs_clear_opt (*mount_options, UFSTYPE);
+			ufs_set_opt (*mount_options, UFSTYPE_SUNx86);
+			break;
+		case Opt_type_sun:
+			ufs_clear_opt (*mount_options, UFSTYPE);
 			ufs_set_opt (*mount_options, UFSTYPE_SUN);
-			else if (!strcmp (value, "44bsd"))
+			break;
+		case Opt_type_44bsd:
+			ufs_clear_opt (*mount_options, UFSTYPE);
 			ufs_set_opt (*mount_options, UFSTYPE_44BSD);
-			else if (!strcmp (value, "nextstep"))
-				ufs_set_opt (*mount_options, UFSTYPE_NEXTSTEP);
-			else if (!strcmp (value, "nextstep-cd"))
+			break;
+		case Opt_type_hp:
+			ufs_clear_opt (*mount_options, UFSTYPE);
+			ufs_set_opt (*mount_options, UFSTYPE_HP);
+			break;
+		case Opt_type_nextstepcd:
+			ufs_clear_opt (*mount_options, UFSTYPE);
 			ufs_set_opt (*mount_options, UFSTYPE_NEXTSTEP_CD);
-			else if (!strcmp (value, "openstep"))
+			break;
+		case Opt_type_nextstep:
+			ufs_clear_opt (*mount_options, UFSTYPE);
+			ufs_set_opt (*mount_options, UFSTYPE_NEXTSTEP);
+			break;
+		case Opt_type_openstep:
+			ufs_clear_opt (*mount_options, UFSTYPE);
 			ufs_set_opt (*mount_options, UFSTYPE_OPENSTEP);
-			else if (!strcmp (value, "sunx86"))
-				ufs_set_opt (*mount_options, UFSTYPE_SUNx86);
-			else if (!strcmp (value, "hp"))
-				ufs_set_opt (*mount_options, UFSTYPE_HP);
-			else {
-				printk ("UFS-fs: Invalid type option: %s\n", value);
-				return 0;
-			}
-		}
-		else if (!strcmp (this_char, "onerror")) {
+			break;
+		case Opt_onerror_panic:
 			ufs_clear_opt (*mount_options, ONERROR);
-			if (!strcmp (value, "panic"))
 			ufs_set_opt (*mount_options, ONERROR_PANIC);
-			else if (!strcmp (value, "lock"))
+			break;
+		case Opt_onerror_lock:
+			ufs_clear_opt (*mount_options, ONERROR);
 			ufs_set_opt (*mount_options, ONERROR_LOCK);
-			else if (!strcmp (value, "umount"))
+			break;
+		case Opt_onerror_umount:
+			ufs_clear_opt (*mount_options, ONERROR);
 			ufs_set_opt (*mount_options, ONERROR_UMOUNT);
-			else if (!strcmp (value, "repair")) {
+			break;
+		case Opt_onerror_repair:
 			printk("UFS-fs: Unable to do repair on error, "
-					"will lock lock instead \n");
+				"will lock lock instead\n");
+			ufs_clear_opt (*mount_options, ONERROR);
 			ufs_set_opt (*mount_options, ONERROR_REPAIR);
-			}
-			else {
-				printk ("UFS-fs: Invalid action onerror: %s\n", value);
-				return 0;
-			}
-		}
-		else {
-			printk("UFS-fs: Invalid option: %s\n", this_char);
+			break;
+		default:
+			printk("UFS-fs: Invalid option: \"%s\" "
+					"or missing value\n", p);
 			return 0;
 		}
 	}

include/linux/parser.h

+struct match_token {
+	int token;
+	char *pattern;
+};
+
+typedef struct match_token match_table_t[];
+
+enum {MAX_OPT_ARGS = 3};
+
+typedef struct {
+	char *from;
+	char *to;
+} substring_t;
+
+int match_token(char *s, match_table_t table, substring_t args[]);
+
+int match_int(substring_t *, int *result);
+int match_octal(substring_t *, int *result);
+int match_hex(substring_t *, int *result);
+void match_strcpy(char *, substring_t *);
+char *match_strdup(substring_t *);

lib/Makefile

@@ -5,7 +5,7 @@
 
 lib-y := errno.o ctype.o string.o vsprintf.o cmdline.o \
 	 bust_spinlocks.o rbtree.o radix-tree.o dump_stack.o \
-	 kobject.o idr.o div64.o
+	 kobject.o idr.o div64.o parser.o
 
 lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
 lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o

lib/parser.c

+/*
+ * lib/parser.c - simple parser for mount, etc. options.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/parser.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+static int match_one(char *s, char *p, substring_t args[])
+{
+	char *meta;
+	int argc = 0;
+
+	if (!p)
+		return 1;
+
+	while(1) {
+		int len = -1;
+		meta = strchr(p, '%');
+		if (!meta)
+			return strcmp(p, s) == 0;
+
+		if (strncmp(p, s, meta-p))
+			return 0;
+
+		s += meta - p;
+		p = meta + 1;
+
+		if (isdigit(*p))
+			len = simple_strtoul(p, &p, 10);
+		else if (*p == '%') {
+			if (*s++ != '%')
+				return 0;
+			continue;
+		}
+
+		if (argc >= MAX_OPT_ARGS)
+			return 0;
+
+		args[argc].from = s;
+		switch (*p++) {
+		case 's':
+			if (len == -1 || len > strlen(s))
+				len = strlen(s);
+			args[argc].to = s + len;
+			break;
+		case 'd':
+			simple_strtol(s, &args[argc].to, 0);
+			goto num;
+		case 'u':
+			simple_strtoul(s, &args[argc].to, 0);
+			goto num;
+		case 'o':
+			simple_strtoul(s, &args[argc].to, 8);
+			goto num;
+		case 'x':
+			simple_strtoul(s, &args[argc].to, 16);
+		num:
+			if (args[argc].to == args[argc].from)
+				return 0;
+			break;
+		default:
+			return 0;
+		}
+		s = args[argc].to;
+		argc++;
+	}
+}
+
+int match_token(char *s, match_table_t table, substring_t args[])
+{
+	struct match_token *p;
+
+	for (p = table; !match_one(s, p->pattern, args) ; p++)
+		;
+
+	return p->token;
+}
+
+static int match_number(substring_t *s, int *result, int base)
+{
+	char *endp;
+	char *buf;
+	int ret;
+
+	buf = kmalloc(s->to - s->from + 1, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+	memcpy(buf, s->from, s->to - s->from);
+	buf[s->to - s->from] = '\0';
+	*result = simple_strtol(buf, &endp, base);
+	ret = 0;
+	if (endp == buf)
+		ret = -EINVAL;
+	kfree(buf);
+	return ret;
+}
+
+int match_int(substring_t *s, int *result)
+{
+	return match_number(s, result, 0);
+}
+
+int match_octal(substring_t *s, int *result)
+{
+	return match_number(s, result, 8);
+}
+
+int match_hex(substring_t *s, int *result)
+{
+	return match_number(s, result, 16);
+}
+
+void match_strcpy(char *to, substring_t *s)
+{
+	memcpy(to, s->from, s->to - s->from);
+	to[s->to - s->from] = '\0';
+}
+
+char *match_strdup(substring_t *s)
+{
+	char *p = kmalloc(s->to - s->from + 1, GFP_KERNEL);
+	if (p)
+		match_strcpy(p, s);
+	return p;
+}
+
+EXPORT_SYMBOL(match_token);
+EXPORT_SYMBOL(match_int);
+EXPORT_SYMBOL(match_octal);
+EXPORT_SYMBOL(match_hex);
+EXPORT_SYMBOL(match_strcpy);
+EXPORT_SYMBOL(match_strdup);