nfs: break up nfs_follow_referral

This function is a little longer and more deeply nested than necessary.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index b112857..956cbbc 100644 (file)
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -110,6 +110,48 @@ static inline int valid_ipaddr4(const char *buf)
        return 0;
 }
 
+static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
+                                    char *page, char *page2,
+                                    const struct nfs4_fs_location *location)
+{
+       struct vfsmount *mnt = ERR_PTR(-ENOENT);
+       char *mnt_path;
+       unsigned int s = 0;
+
+       mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
+       if (IS_ERR(mnt_path))
+               return mnt;
+       mountdata->mnt_path = mnt_path;
+
+       while (s < location->nservers) {
+               struct sockaddr_in addr = {
+                       .sin_family     = AF_INET,
+                       .sin_port       = htons(NFS_PORT),
+               };
+
+               if (location->servers[s].len <= 0 ||
+                   valid_ipaddr4(location->servers[s].data) < 0) {
+                       s++;
+                       continue;
+               }
+
+               mountdata->hostname = location->servers[s].data;
+               addr.sin_addr.s_addr = in_aton(mountdata->hostname),
+               mountdata->addr = (struct sockaddr *)&addr;
+               mountdata->addrlen = sizeof(addr);
+
+               snprintf(page, PAGE_SIZE, "%s:%s",
+                               mountdata->hostname,
+                               mountdata->mnt_path);
+
+               mnt = vfs_kern_mount(&nfs4_referral_fs_type, 0, page, mountdata);
+               if (!IS_ERR(mnt))
+                       break;
+               s++;
+       }
+       return mnt;
+}
+
 /**
  * nfs_follow_referral - set up mountpoint when hitting a referral on moved error
  * @mnt_parent - mountpoint of parent directory
@@ -128,7 +170,6 @@ static struct vfsmount *nfs_follow_referral(const struct vfsmount *mnt_parent,
                .authflavor = NFS_SB(mnt_parent->mnt_sb)->client->cl_auth->au_flavor,
        };
        char *page = NULL, *page2 = NULL;
-       unsigned int s;
        int loc, error;
 
        if (locations == NULL || locations->nlocations <= 0)
@@ -153,9 +194,8 @@ static struct vfsmount *nfs_follow_referral(const struct vfsmount *mnt_parent,
        }
 
        loc = 0;
-       while (loc < locations->nlocations && IS_ERR(mnt)) {
+       while (loc < locations->nlocations) {
                const struct nfs4_fs_location *location = &locations->locations[loc];
-               char *mnt_path;
 
                if (location == NULL || location->nservers <= 0 ||
                    location->rootpath.ncomponents == 0) {
@@ -163,41 +203,9 @@ static struct vfsmount *nfs_follow_referral(const struct vfsmount *mnt_parent,
                        continue;
                }
 
-               mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
-               if (IS_ERR(mnt_path)) {
-                       loc++;
-                       continue;
-               }
-               mountdata.mnt_path = mnt_path;
-
-               s = 0;
-               while (s < location->nservers) {
-                       struct sockaddr_in addr = {
-                               .sin_family     = AF_INET,
-                               .sin_port       = htons(NFS_PORT),
-                       };
-
-                       if (location->servers[s].len <= 0 ||
-                           valid_ipaddr4(location->servers[s].data) < 0) {
-                               s++;
-                               continue;
-                       }
-
-                       mountdata.hostname = location->servers[s].data;
-                       addr.sin_addr.s_addr = in_aton(mountdata.hostname),
-                       mountdata.addr = (struct sockaddr *)&addr;
-                       mountdata.addrlen = sizeof(addr);
-
-                       snprintf(page, PAGE_SIZE, "%s:%s",
-                                       mountdata.hostname,
-                                       mountdata.mnt_path);
-
-                       mnt = vfs_kern_mount(&nfs4_referral_fs_type, 0, page, &mountdata);
-                       if (!IS_ERR(mnt)) {
-                               break;
-                       }
-                       s++;
-               }
+               mnt = try_location(&mountdata, page, page2, location);
+               if (!IS_ERR(mnt))
+                       break;
                loc++;
        }