fs_parse: get rid of ->enums

Don't do a single array; attach them to fsparam_enum() entry
instead.  And don't bother trying to embed the names into those -
it actually loses memory, with no real speedup worth mentioning.

Simplifies validation as well.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/afs/super.c

@@ -73,26 +73,25 @@ enum afs_param {
 	Opt_source,
 };
 
+static const struct fs_parameter_enum afs_param_flock[] = {
+	{"local",	afs_flock_mode_local },
+	{"openafs",	afs_flock_mode_openafs },
+	{"strict",	afs_flock_mode_strict },
+	{"write",	afs_flock_mode_write },
+	{}
+};
+
 static const struct fs_parameter_spec afs_param_specs[] = {
 	fsparam_flag  ("autocell",	Opt_autocell),
 	fsparam_flag  ("dyn",		Opt_dyn),
-	fsparam_enum  ("flock",		Opt_flock),
+	fsparam_enum  ("flock",		Opt_flock, afs_param_flock),
 	fsparam_string("source",	Opt_source),
 	{}
 };
 
-static const struct fs_parameter_enum afs_param_enums[] = {
-	{ Opt_flock,	"local",	afs_flock_mode_local },
-	{ Opt_flock,	"openafs",	afs_flock_mode_openafs },
-	{ Opt_flock,	"strict",	afs_flock_mode_strict },
-	{ Opt_flock,	"write",	afs_flock_mode_write },
-	{}
-};
-
 static const struct fs_parameter_description afs_fs_parameters = {
 	.name		= "kAFS",
 	.specs		= afs_param_specs,
-	.enums		= afs_param_enums,
 };
 
 /*

fs/ceph/super.c

@@ -163,9 +163,9 @@ enum ceph_recover_session_mode {
 	ceph_recover_session_clean
 };
 
-static const struct fs_parameter_enum ceph_mount_param_enums[] = {
-	{ Opt_recover_session,	"no",		ceph_recover_session_no },
-	{ Opt_recover_session,	"clean",	ceph_recover_session_clean },
+static const struct fs_parameter_enum ceph_param_recover[] = {
+	{ "no",		ceph_recover_session_no },
+	{ "clean",	ceph_recover_session_clean },
 	{}
 };
 
@@ -180,7 +180,7 @@ static const struct fs_parameter_spec ceph_mount_param_specs[] = {
 	fsparam_flag_no ("dcache",			Opt_dcache),
 	fsparam_flag_no ("dirstat",			Opt_dirstat),
 	__fsparam	(fs_param_is_string, "fsc",	Opt_fscache,
-			 fs_param_neg_with_no | fs_param_v_optional),
+			 fs_param_neg_with_no | fs_param_v_optional, NULL),
 	fsparam_flag_no ("ino32",			Opt_ino32),
 	fsparam_string	("mds_namespace",		Opt_mds_namespace),
 	fsparam_flag_no ("poolperm",			Opt_poolperm),
@@ -189,7 +189,7 @@ static const struct fs_parameter_spec ceph_mount_param_specs[] = {
 	fsparam_flag_no ("rbytes",			Opt_rbytes),
 	fsparam_u32	("readdir_max_bytes",		Opt_readdir_max_bytes),
 	fsparam_u32	("readdir_max_entries",		Opt_readdir_max_entries),
-	fsparam_enum	("recover_session",		Opt_recover_session),
+	fsparam_enum	("recover_session",		Opt_recover_session, ceph_param_recover),
 	fsparam_flag_no ("require_active_mds",		Opt_require_active_mds),
 	fsparam_u32	("rsize",			Opt_rsize),
 	fsparam_string	("snapdirname",			Opt_snapdirname),
@@ -201,7 +201,6 @@ static const struct fs_parameter_spec ceph_mount_param_specs[] = {
 static const struct fs_parameter_description ceph_mount_parameters = {
 	.name           = "ceph",
 	.specs          = ceph_mount_param_specs,
-	.enums		= ceph_mount_param_enums,
 };
 
 struct ceph_parse_opts_ctx {

fs/fs_parser.c

@@ -189,9 +189,8 @@ int fs_parse(struct fs_context *fc,
 		goto maybe_okay;
 
 	case fs_param_is_enum:
-		for (e = desc->enums; e->name[0]; e++) {
-			if (e->opt == p->opt &&
-			    strcmp(e->name, param->string) == 0) {
+		for (e = p->data; e->name; e++) {
+			if (strcmp(e->name, param->string) == 0) {
 				result->uint_32 = e->value;
 				goto okay;
 			}
@@ -359,10 +358,8 @@ bool validate_constant_table(const struct constant_table *tbl, size_t tbl_size,
 bool fs_validate_description(const struct fs_parameter_description *desc)
 {
 	const struct fs_parameter_spec *param, *p2;
-	const struct fs_parameter_enum *e;
 	const char *name = desc->name;
-	unsigned int nr_params = 0;
-	bool good = true, enums = false;
+	bool good = true;
 
 	pr_notice("*** VALIDATE %s ***\n", name);
 
@@ -383,7 +380,12 @@ bool fs_validate_description(const struct fs_parameter_description *desc)
 				       name, param->name, t);
 				good = false;
 			} else if (t == fs_param_is_enum) {
-				enums = true;
+				const struct fs_parameter_enum *e = param->data;
+				if (!e || !e->name) {
+					pr_err("VALIDATE %s: PARAM[%s] enum with no values\n",
+					       name, param->name);
+					good = false;
+				}
 			}
 
 			/* Check for duplicate parameter names */
@@ -395,63 +397,7 @@ bool fs_validate_description(const struct fs_parameter_description *desc)
 				}
 			}
 		}
-
-		nr_params = param - desc->specs;
-	}
-
-	if (desc->enums) {
-		if (!nr_params) {
-			pr_err("VALIDATE %s: Enum table but no parameters\n",
-			       name);
-			good = false;
-			goto no_enums;
-		}
-		if (!enums) {
-			pr_err("VALIDATE %s: Enum table but no enum-type values\n",
-			       name);
-			good = false;
-			goto no_enums;
-		}
-
-		for (e = desc->enums; e->name[0]; e++) {
-			/* Check that all entries in the enum table have at
-			 * least one parameter that uses them.
-			 */
-			for (param = desc->specs; param->name; param++) {
-				if (param->opt == e->opt &&
-				    param->type != fs_param_is_enum) {
-					pr_err("VALIDATE %s: e[%tu] enum val for %s\n",
-					       name, e - desc->enums, param->name);
-					good = false;
-				}
-			}
-		}
-
-		/* Check that all enum-type parameters have at least one enum
-		 * value in the enum table.
-		 */
-		for (param = desc->specs; param->name; param++) {
-			if (param->type != fs_param_is_enum)
-				continue;
-			for (e = desc->enums; e->name[0]; e++)
-				if (e->opt == param->opt)
-					break;
-			if (!e->name[0]) {
-				pr_err("VALIDATE %s: PARAM[%s] enum with no values\n",
-				       name, param->name);
-				good = false;
-			}
-		}
-	} else {
-		if (enums) {
-			pr_err("VALIDATE %s: enum-type values, but no enum table\n",
-			       name);
-			good = false;
-			goto no_enums;
-		}
 	}
-
-no_enums:
 	return good;
 }
 #endif /* CONFIG_VALIDATE_FS_PARSER */

fs/gfs2/ops_fstype.c

@@ -1271,6 +1271,13 @@ enum opt_quota {
 	Opt_quota_on,
 };
 
+static const struct fs_parameter_enum gfs2_param_quota[] = {
+	{"off",        Opt_quota_off },
+	{"account",    Opt_quota_account },
+	{"on",         Opt_quota_on },
+	{}
+};
+
 static const unsigned int opt_quota_values[] = {
 	[Opt_quota_off]     = GFS2_QUOTA_OFF,
 	[Opt_quota_account] = GFS2_QUOTA_ACCOUNT,
@@ -1282,11 +1289,23 @@ enum opt_data {
 	Opt_data_ordered   = GFS2_DATA_ORDERED,
 };
 
+static const struct fs_parameter_enum gfs2_param_data[] = {
+	{"writeback",  Opt_data_writeback },
+	{"ordered",    Opt_data_ordered },
+	{}
+};
+
 enum opt_errors {
 	Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
 	Opt_errors_panic    = GFS2_ERRORS_PANIC,
 };
 
+static const struct fs_parameter_enum gfs2_param_errors[] = {
+	{"withdraw",   Opt_errors_withdraw },
+	{"panic",      Opt_errors_panic },
+	{}
+};
+
 static const struct fs_parameter_spec gfs2_param_specs[] = {
 	fsparam_string ("lockproto",          Opt_lockproto),
 	fsparam_string ("locktable",          Opt_locktable),
@@ -1300,11 +1319,11 @@ static const struct fs_parameter_spec gfs2_param_specs[] = {
 	fsparam_flag   ("upgrade",            Opt_upgrade),
 	fsparam_flag_no("acl",                Opt_acl),
 	fsparam_flag_no("suiddir",            Opt_suiddir),
-	fsparam_enum   ("data",               Opt_data),
+	fsparam_enum   ("data",               Opt_data, gfs2_param_data),
 	fsparam_flag   ("meta",               Opt_meta),
 	fsparam_flag_no("discard",            Opt_discard),
 	fsparam_s32    ("commit",             Opt_commit),
-	fsparam_enum   ("errors",             Opt_errors),
+	fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
 	fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
 	fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
 	fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
@@ -1312,25 +1331,14 @@ static const struct fs_parameter_spec gfs2_param_specs[] = {
 	fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
 	fsparam_flag_no("loccookie",          Opt_loccookie),
 	/* quota can be a flag or an enum so it gets special treatment */
-	__fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional),
-	{}
-};
-
-static const struct fs_parameter_enum gfs2_param_enums[] = {
-	{ Opt_quota,    "off",        Opt_quota_off },
-	{ Opt_quota,    "account",    Opt_quota_account },
-	{ Opt_quota,    "on",         Opt_quota_on },
-	{ Opt_data,     "writeback",  Opt_data_writeback },
-	{ Opt_data,     "ordered",    Opt_data_ordered },
-	{ Opt_errors,   "withdraw",   Opt_errors_withdraw },
-	{ Opt_errors,   "panic",      Opt_errors_panic },
+	__fsparam(fs_param_is_enum, "quota", Opt_quota,
+		fs_param_neg_with_no|fs_param_v_optional, gfs2_param_quota),
 	{}
 };
 
 static const struct fs_parameter_description gfs2_fs_parameters = {
 	.name = "gfs2",
 	.specs = gfs2_param_specs,
-	.enums = gfs2_param_enums,
 };
 
 /* Parse a single mount parameter */

fs/jffs2/super.c

@@ -167,27 +167,26 @@ enum {
 	Opt_rp_size,
 };
 
-static const struct fs_parameter_spec jffs2_param_specs[] = {
-	fsparam_enum	("compr",	Opt_override_compr),
-	fsparam_u32	("rp_size",	Opt_rp_size),
-	{}
-};
-
-static const struct fs_parameter_enum jffs2_param_enums[] = {
-	{ Opt_override_compr,	"none",	JFFS2_COMPR_MODE_NONE },
+static const struct fs_parameter_enum jffs2_param_compr[] = {
+	{"none",	JFFS2_COMPR_MODE_NONE },
 #ifdef CONFIG_JFFS2_LZO
-	{ Opt_override_compr,	"lzo",	JFFS2_COMPR_MODE_FORCELZO },
+	{"lzo",		JFFS2_COMPR_MODE_FORCELZO },
 #endif
 #ifdef CONFIG_JFFS2_ZLIB
-	{ Opt_override_compr,	"zlib",	JFFS2_COMPR_MODE_FORCEZLIB },
+	{"zlib",	JFFS2_COMPR_MODE_FORCEZLIB },
 #endif
 	{}
 };
 
+static const struct fs_parameter_spec jffs2_param_specs[] = {
+	fsparam_enum	("compr",	Opt_override_compr, jffs2_param_compr),
+	fsparam_u32	("rp_size",	Opt_rp_size),
+	{}
+};
+
 const struct fs_parameter_description jffs2_fs_parameters = {
 	.name		= "jffs2",
 	.specs		= jffs2_param_specs,
-	.enums		= jffs2_param_enums,
 };
 
 static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)

fs/nfs/fs_context.c

@@ -83,6 +83,34 @@ enum nfs_param {
 	Opt_wsize,
 };
 
+enum {
+	Opt_local_lock_all,
+	Opt_local_lock_flock,
+	Opt_local_lock_none,
+	Opt_local_lock_posix,
+};
+
+static const struct fs_parameter_enum nfs_param_enums_local_lock[] = {
+	{ "all",		Opt_local_lock_all },
+	{ "flock",	Opt_local_lock_flock },
+	{ "none",		Opt_local_lock_none },
+	{}
+};
+
+enum {
+	Opt_lookupcache_all,
+	Opt_lookupcache_none,
+	Opt_lookupcache_positive,
+};
+
+static const struct fs_parameter_enum nfs_param_enums_lookupcache[] = {
+	{ "all",		Opt_lookupcache_all },
+	{ "none",		Opt_lookupcache_none },
+	{ "pos",		Opt_lookupcache_positive },
+	{ "positive",		Opt_lookupcache_positive },
+	{}
+};
+
 static const struct fs_parameter_spec nfs_param_specs[] = {
 	fsparam_flag_no("ac",		Opt_ac),
 	fsparam_u32   ("acdirmax",	Opt_acdirmax),
@@ -98,13 +126,13 @@ static const struct fs_parameter_spec nfs_param_specs[] = {
 	fsparam_flag_no("cto",		Opt_cto),
 	fsparam_flag  ("fg",		Opt_fg),
 	__fsparam(fs_param_is_string, "fsc",		Opt_fscache,
-		  fs_param_neg_with_no|fs_param_v_optional),
+		  fs_param_neg_with_no|fs_param_v_optional, NULL),
 	fsparam_flag  ("hard",		Opt_hard),
 	__fsparam(fs_param_is_flag, "intr",		Opt_intr,
-		  fs_param_neg_with_no|fs_param_deprecated),
-	fsparam_enum  ("local_lock",	Opt_local_lock),
+		  fs_param_neg_with_no|fs_param_deprecated, NULL),
+	fsparam_enum  ("local_lock",	Opt_local_lock, nfs_param_enums_local_lock),
 	fsparam_flag_no("lock",		Opt_lock),
-	fsparam_enum  ("lookupcache",	Opt_lookupcache),
+	fsparam_enum  ("lookupcache",	Opt_lookupcache, nfs_param_enums_lookupcache),
 	fsparam_flag_no("migration",	Opt_migration),
 	fsparam_u32   ("minorversion",	Opt_minorversion),
 	fsparam_string("mountaddr",	Opt_mountaddr),
@@ -145,35 +173,9 @@ static const struct fs_parameter_spec nfs_param_specs[] = {
 	{}
 };
 
-enum {
-	Opt_local_lock_all,
-	Opt_local_lock_flock,
-	Opt_local_lock_none,
-	Opt_local_lock_posix,
-};
-
-enum {
-	Opt_lookupcache_all,
-	Opt_lookupcache_none,
-	Opt_lookupcache_positive,
-};
-
-static const struct fs_parameter_enum nfs_param_enums[] = {
-	{ Opt_local_lock,	"all",		Opt_local_lock_all },
-	{ Opt_local_lock,	"flock",	Opt_local_lock_flock },
-	{ Opt_local_lock,	"none",		Opt_local_lock_none },
-	{ Opt_local_lock,	"posix",	Opt_local_lock_posix },
-	{ Opt_lookupcache,	"all",		Opt_lookupcache_all },
-	{ Opt_lookupcache,	"none",		Opt_lookupcache_none },
-	{ Opt_lookupcache,	"pos",		Opt_lookupcache_positive },
-	{ Opt_lookupcache,	"positive",	Opt_lookupcache_positive },
-	{}
-};
-
 static const struct fs_parameter_description nfs_fs_parameters = {
 	.name		= "nfs",
 	.specs		= nfs_param_specs,
-	.enums		= nfs_param_enums,
 };
 
 enum {

include/linux/fs_parser.h

@@ -53,18 +53,17 @@ struct fs_parameter_spec {
 #define fs_param_neg_with_no	0x0002	/* "noxxx" is negative param */
 #define fs_param_neg_with_empty	0x0004	/* "xxx=" is negative param */
 #define fs_param_deprecated	0x0008	/* The param is deprecated */
+	const void		*data;
 };
 
 struct fs_parameter_enum {
-	u8		opt;		/* Option number (as fs_parameter_spec::opt) */
-	char		name[14];
+	const char	*name;
 	u8		value;
 };
 
 struct fs_parameter_description {
 	const char	name[16];		/* Name for logging purposes */
 	const struct fs_parameter_spec *specs;	/* List of param specifications */
-	const struct fs_parameter_enum *enums;	/* Enum values */
 };
 
 /*
@@ -114,33 +113,34 @@ static inline bool fs_validate_description(const struct fs_parameter_description
  * work, but any such case is probably a sign that new helper is needed.
  * Helpers will remain stable; low-level implementation may change.
  */
-#define __fsparam(TYPE, NAME, OPT, FLAGS) \
+#define __fsparam(TYPE, NAME, OPT, FLAGS, DATA) \
 	{ \
 		.name = NAME, \
 		.opt = OPT, \
 		.type = TYPE, \
-		.flags = FLAGS \
+		.flags = FLAGS, \
+		.data = DATA \
 	}
 
-#define fsparam_flag(NAME, OPT)	__fsparam(fs_param_is_flag, NAME, OPT, 0)
+#define fsparam_flag(NAME, OPT)	__fsparam(fs_param_is_flag, NAME, OPT, 0, NULL)
 #define fsparam_flag_no(NAME, OPT) \
 				__fsparam(fs_param_is_flag, NAME, OPT, \
-					    fs_param_neg_with_no)
-#define fsparam_bool(NAME, OPT)	__fsparam(fs_param_is_bool, NAME, OPT, 0)
-#define fsparam_u32(NAME, OPT)	__fsparam(fs_param_is_u32, NAME, OPT, 0)
+					    fs_param_neg_with_no, NULL)
+#define fsparam_bool(NAME, OPT)	__fsparam(fs_param_is_bool, NAME, OPT, 0, NULL)
+#define fsparam_u32(NAME, OPT)	__fsparam(fs_param_is_u32, NAME, OPT, 0, NULL)
 #define fsparam_u32oct(NAME, OPT) \
-				__fsparam(fs_param_is_u32_octal, NAME, OPT, 0)
+				__fsparam(fs_param_is_u32_octal, NAME, OPT, 0, NULL)
 #define fsparam_u32hex(NAME, OPT) \
-				__fsparam(fs_param_is_u32_hex, NAME, OPT, 0)
-#define fsparam_s32(NAME, OPT)	__fsparam(fs_param_is_s32, NAME, OPT, 0)
-#define fsparam_u64(NAME, OPT)	__fsparam(fs_param_is_u64, NAME, OPT, 0)
-#define fsparam_enum(NAME, OPT)	__fsparam(fs_param_is_enum, NAME, OPT, 0)
+				__fsparam(fs_param_is_u32_hex, NAME, OPT, 0, NULL)
+#define fsparam_s32(NAME, OPT)	__fsparam(fs_param_is_s32, NAME, OPT, 0, NULL)
+#define fsparam_u64(NAME, OPT)	__fsparam(fs_param_is_u64, NAME, OPT, 0, NULL)
+#define fsparam_enum(NAME, OPT, array)	__fsparam(fs_param_is_enum, NAME, OPT, 0, array)
 #define fsparam_string(NAME, OPT) \
-				__fsparam(fs_param_is_string, NAME, OPT, 0)
-#define fsparam_blob(NAME, OPT)	__fsparam(fs_param_is_blob, NAME, OPT, 0)
-#define fsparam_bdev(NAME, OPT)	__fsparam(fs_param_is_blockdev, NAME, OPT, 0)
-#define fsparam_path(NAME, OPT)	__fsparam(fs_param_is_path, NAME, OPT, 0)
-#define fsparam_fd(NAME, OPT)	__fsparam(fs_param_is_fd, NAME, OPT, 0)
+				__fsparam(fs_param_is_string, NAME, OPT, 0, NULL)
+#define fsparam_blob(NAME, OPT)	__fsparam(fs_param_is_blob, NAME, OPT, 0, NULL)
+#define fsparam_bdev(NAME, OPT)	__fsparam(fs_param_is_blockdev, NAME, OPT, 0, NULL)
+#define fsparam_path(NAME, OPT)	__fsparam(fs_param_is_path, NAME, OPT, 0, NULL)
+#define fsparam_fd(NAME, OPT)	__fsparam(fs_param_is_fd, NAME, OPT, 0, NULL)
 
 
 #endif /* _LINUX_FS_PARSER_H */

mm/shmem.c

@@ -3381,9 +3381,19 @@ enum shmem_param {
 	Opt_uid,
 };
 
+static const struct fs_parameter_enum shmem_param_enums_huge[] = {
+	{"never",	SHMEM_HUGE_NEVER },
+	{"always",	SHMEM_HUGE_ALWAYS },
+	{"within_size",	SHMEM_HUGE_WITHIN_SIZE },
+	{"advise",	SHMEM_HUGE_ADVISE },
+	{"deny",	SHMEM_HUGE_DENY },
+	{"force",	SHMEM_HUGE_FORCE },
+	{}
+};
+
 static const struct fs_parameter_spec shmem_param_specs[] = {
 	fsparam_u32   ("gid",		Opt_gid),
-	fsparam_enum  ("huge",		Opt_huge),
+	fsparam_enum  ("huge",		Opt_huge,  shmem_param_enums_huge),
 	fsparam_u32oct("mode",		Opt_mode),
 	fsparam_string("mpol",		Opt_mpol),
 	fsparam_string("nr_blocks",	Opt_nr_blocks),
@@ -3393,18 +3403,9 @@ static const struct fs_parameter_spec shmem_param_specs[] = {
 	{}
 };
 
-static const struct fs_parameter_enum shmem_param_enums[] = {
-	{ Opt_huge,	"never",	SHMEM_HUGE_NEVER },
-	{ Opt_huge,	"always",	SHMEM_HUGE_ALWAYS },
-	{ Opt_huge,	"within_size",	SHMEM_HUGE_WITHIN_SIZE },
-	{ Opt_huge,	"advise",	SHMEM_HUGE_ADVISE },
-	{}
-};
-
 const struct fs_parameter_description shmem_fs_parameters = {
 	.name		= "tmpfs",
 	.specs		= shmem_param_specs,
-	.enums		= shmem_param_enums,
 };
 
 static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param)

net/ceph/ceph_common.c

@@ -283,7 +283,7 @@ static const struct fs_parameter_spec ceph_param_specs[] = {
 	fsparam_u32	("osd_request_timeout",		Opt_osd_request_timeout),
 	fsparam_u32	("osdkeepalive",		Opt_osdkeepalivetimeout),
 	__fsparam	(fs_param_is_s32, "osdtimeout", Opt_osdtimeout,
-			 fs_param_deprecated),
+			 fs_param_deprecated, NULL),
 	fsparam_string	("secret",			Opt_secret),
 	fsparam_flag_no ("share",			Opt_share),
 	fsparam_flag_no ("tcp_nodelay",			Opt_tcp_nodelay),