NFSv4: Reduce the stack footprint of try_location()

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c
index f071d12..832f9b5 100644 (file)
--- a/fs/nfs/nfs4namespace.c
+++ b/fs/nfs/nfs4namespace.c
@@ -115,6 +115,7 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
                                     char *page, char *page2,
                                     const struct nfs4_fs_location *location)
 {
+       const size_t addr_bufsize = sizeof(struct sockaddr_storage);
        struct vfsmount *mnt = ERR_PTR(-ENOENT);
        char *mnt_path;
        unsigned int maxbuflen;
@@ -126,9 +127,12 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
        mountdata->mnt_path = mnt_path;
        maxbuflen = mnt_path - 1 - page2;
 
+       mountdata->addr = kmalloc(addr_bufsize, GFP_KERNEL);
+       if (mountdata->addr == NULL)
+               return ERR_PTR(-ENOMEM);
+
        for (s = 0; s < location->nservers; s++) {
                const struct nfs4_string *buf = &location->servers[s];
-               struct sockaddr_storage addr;
 
                if (buf->len <= 0 || buf->len >= maxbuflen)
                        continue;
@@ -137,11 +141,10 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
                        continue;
 
                mountdata->addrlen = nfs_parse_server_name(buf->data, buf->len,
-                               (struct sockaddr *)&addr, sizeof(addr));
+                               mountdata->addr, addr_bufsize);
                if (mountdata->addrlen == 0)
                        continue;
 
-               mountdata->addr = (struct sockaddr *)&addr;
                rpc_set_port(mountdata->addr, NFS_PORT);
 
                memcpy(page2, buf->data, buf->len);
@@ -156,6 +159,7 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
                if (!IS_ERR(mnt))
                        break;
        }
+       kfree(mountdata->addr);
        return mnt;
 }