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authorAl Viro <viro@zeniv.linux.org.uk>2019-12-17 14:15:04 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2020-02-07 00:10:29 -0500
commit0f89589a8c6f1033cb847a606517998efb0da8ee (patch)
treec20e5e8b71553ced5b592d6135a76cb975e12253 /fs
parent7dc2993a9e51dd2eee955944efec65bef90265b7 (diff)
Pass consistent param->type to fs_parse()
As it is, vfs_parse_fs_string() makes "foo" and "foo=" indistinguishable; both get fs_value_is_string for ->type and NULL for ->string. To make it even more unpleasant, that combination is impossible to produce with fsconfig(). Much saner rules would be "foo" => fs_value_is_flag, NULL "foo=" => fs_value_is_string, "" "foo=bar" => fs_value_is_string, "bar" All cases are distinguishable, all results are expressable by fsconfig(), ->has_value checks are much simpler that way (to the point of the field being useless) and quite a few regressions go away (gfs2 has no business accepting -o nodebug=, for example). Partially based upon patches from Miklos. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/fs_context.c5
-rw-r--r--fs/fs_parser.c23
2 files changed, 14 insertions, 14 deletions
diff --git a/fs/fs_context.c b/fs/fs_context.c
index 138b5b4d621d..9097421cbba5 100644
--- a/fs/fs_context.c
+++ b/fs/fs_context.c
@@ -175,14 +175,15 @@ int vfs_parse_fs_string(struct fs_context *fc, const char *key,
struct fs_parameter param = {
.key = key,
- .type = fs_value_is_string,
+ .type = fs_value_is_flag,
.size = v_size,
};
- if (v_size > 0) {
+ if (value) {
param.string = kmemdup_nul(value, v_size, GFP_KERNEL);
if (!param.string)
return -ENOMEM;
+ param.type = fs_value_is_string;
}
ret = vfs_parse_fs_param(fc, &param);
diff --git a/fs/fs_parser.c b/fs/fs_parser.c
index d1930adce68d..07ae041b83a8 100644
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -85,7 +85,6 @@ int fs_parse(struct fs_context *fc,
const struct fs_parameter_enum *e;
int ret = -ENOPARAM, b;
- result->has_value = !!param->string;
result->negated = false;
result->uint_64 = 0;
@@ -95,7 +94,7 @@ int fs_parse(struct fs_context *fc,
* "xxx" takes the "no"-form negative - but only if there
* wasn't an value.
*/
- if (result->has_value)
+ if (param->type != fs_value_is_flag)
goto unknown_parameter;
if (param->key[0] != 'n' || param->key[1] != 'o' || !param->key[2])
goto unknown_parameter;
@@ -127,14 +126,18 @@ int fs_parse(struct fs_context *fc,
case fs_param_is_u64:
case fs_param_is_enum:
case fs_param_is_string:
- if (param->type != fs_value_is_string)
- goto bad_value;
- if (!result->has_value) {
+ if (param->type == fs_value_is_string) {
+ if (p->flags & fs_param_v_optional)
+ break;
+ if (!*param->string)
+ goto bad_value;
+ break;
+ }
+ if (param->type == fs_value_is_flag) {
if (p->flags & fs_param_v_optional)
goto okay;
- goto bad_value;
}
- /* Fall through */
+ goto bad_value;
default:
break;
}
@@ -144,8 +147,7 @@ int fs_parse(struct fs_context *fc,
*/
switch (p->type) {
case fs_param_is_flag:
- if (param->type != fs_value_is_flag &&
- (param->type != fs_value_is_string || result->has_value))
+ if (param->type != fs_value_is_flag)
return invalf(fc, "%s: Unexpected value for '%s'",
desc->name, param->key);
result->boolean = true;
@@ -206,9 +208,6 @@ int fs_parse(struct fs_context *fc,
case fs_param_is_fd: {
switch (param->type) {
case fs_value_is_string:
- if (!result->has_value)
- goto bad_value;
-
ret = kstrtouint(param->string, 0, &result->uint_32);
break;
case fs_value_is_file: