From: Hu Weiwen <sehuww@xxxxxxxxxxxxxxxx>
Same logic, slightly less code. Make the following changes easier.
Signed-off-by: Hu Weiwen <sehuww@xxxxxxxxxxxxxxxx>
---
fs/ceph/super.c | 34 ++++++++++++++--------------------
1 file changed, 14 insertions(+), 20 deletions(-)
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 3fc48b43cab0..4e1f4031e888 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -235,18 +235,10 @@ static void canonicalize_path(char *path)
path[j] = '\0';
}
-/*
- * Check if the mds namespace in ceph_mount_options matches
- * the passed in namespace string. First time match (when
- * ->mds_namespace is NULL) is treated specially, since
- * ->mds_namespace needs to be initialized by the caller.
- */
-static int namespace_equals(struct ceph_mount_options *fsopt,
- const char *namespace, size_t len)
+/* check if s1 (null terminated) equals to s2 (with length len2) */
+static int strstrn_equals(const char *s1, const char *s2, size_t len2)
{
- return !(fsopt->mds_namespace &&
- (strlen(fsopt->mds_namespace) != len ||
- strncmp(fsopt->mds_namespace, namespace, len)));
+ return !strncmp(s1, s2, len2) && strlen(s1) == len2;
}
static int ceph_parse_old_source(const char *dev_name, const char *dev_name_end,
@@ -297,12 +289,13 @@ static int ceph_parse_new_source(const char *dev_name, const char *dev_name_end,
++fs_name_start; /* start of file system name */
len = dev_name_end - fs_name_start;
- if (!namespace_equals(fsopt, fs_name_start, len))
+ if (!fsopt->mds_namespace) {
+ fsopt->mds_namespace = kstrndup(fs_name_start, len, GFP_KERNEL);
+ if (!fsopt->mds_namespace)
+ return -ENOMEM;
+ } else if (!strstrn_equals(fsopt->mds_namespace, fs_name_start, len)) {
return invalfc(fc, "Mismatching mds_namespace");
- kfree(fsopt->mds_namespace);
- fsopt->mds_namespace = kstrndup(fs_name_start, len, GFP_KERNEL);
- if (!fsopt->mds_namespace)
- return -ENOMEM;
+ }
dout("file system (mds namespace) '%s'\n", fsopt->mds_namespace);
fsopt->new_dev_syntax = true;
@@ -417,11 +410,12 @@ static int ceph_parse_mount_param(struct fs_context *fc,
param->string = NULL;
break;
case Opt_mds_namespace:
- if (!namespace_equals(fsopt, param->string, strlen(param->string)))
+ if (!fsopt->mds_namespace) {
+ fsopt->mds_namespace = param->string;
+ param->string = NULL;
+ } else if (strcmp(fsopt->mds_namespace, param->string)) {
return invalfc(fc, "Mismatching mds_namespace");
- kfree(fsopt->mds_namespace);
- fsopt->mds_namespace = param->string;
- param->string = NULL;
+ }
break;
case Opt_recover_session:
mode = result.uint_32;
--
2.25.1
