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fscrypt: make fscrypt_set_test_dummy_encryption() take a 'const char *'

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fscrypt_set_test_dummy_encryption() requires that the optional argument
to the test_dummy_encryption mount option be specified as a substring_t.
That doesn't work well with filesystems that use the new mount API,
since the new way of parsing mount options doesn't use substring_t.

Make it take the argument as a 'const char *' instead.

Instead of moving the match_strdup() into the callers in ext4 and f2fs,
make them just use arg->from directly.  Since the pattern is
"test_dummy_encryption=%s", the argument will be null-terminated.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20200917041136.178600-14-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2020-09-16 21:11:36 -07:00
parent ac4acb1f4b
commit c8c868abc9
4 changed files with 9 additions and 20 deletions
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5
include/linux/fscrypt.h
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@ -15,7 +15,6 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/parser.h>
#include <linux/slab.h>
#include <uapi/linux/fscrypt.h>
@ -153,9 +152,7 @@ struct fscrypt_dummy_policy {
const union fscrypt_policy *policy;
};
int fscrypt_set_test_dummy_encryption(
struct super_block *sb,
const substring_t *arg,
int fscrypt_set_test_dummy_encryption(struct super_block *sb, const char *arg,
struct fscrypt_dummy_policy *dummy_policy);
void fscrypt_show_test_dummy_encryption(struct seq_file *seq, char sep,
struct super_block *sb);