btrfs: cleanup unnecessary string dup in btrfs_parse_options()

Long ago, commit edf24abe51493 ("btrfs: sanity mount option parsing and
early mount code") split the btrfs_parse_options() into two parts
(btrfs_parse_early_options() and btrfs_parse_options()). As a result,
btrfs_parse_optins no longer gets called twice and is the last one to
parse mount option string. Therefore there is no need to dup it.

Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 03367a6..1d33744 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -414,7 +414,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
                        unsigned long new_flags)
 {
        substring_t args[MAX_OPT_ARGS];
-       char *p, *num, *orig = NULL;
+       char *p, *num;
        u64 cache_gen;
        int intarg;
        int ret = 0;
@@ -437,16 +437,6 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
        if (!options)
                goto check;
 
-       /*
-        * strsep changes the string, duplicate it because parse_options
-        * gets called twice
-        */
-       options = kstrdup(options, GFP_KERNEL);
-       if (!options)
-               return -ENOMEM;
-
-       orig = options;
-
        while ((p = strsep(&options, ",")) != NULL) {
                int token;
                if (!*p)
@@ -887,7 +877,6 @@ out:
                btrfs_info(info, "disk space caching is enabled");
        if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE))
                btrfs_info(info, "using free space tree");
-       kfree(orig);
        return ret;
 }