From: Bryan Schumaker <bjschuma@xxxxxxxxxx>
The only difference between nfs_xdev_mount() and nfs4_xdev_mount() is the
clone_super() function called to clone the super block. I can combine
these two functions by using the fill_super field in the mount_info
structure.
Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
---
fs/nfs/super.c | 122 +++++++++++++++-----------------------------------------
1 file changed, 32 insertions(+), 90 deletions(-)
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 64a62da..707d1f6 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -280,6 +280,7 @@ static match_table_t nfs_vers_tokens = {
struct nfs_mount_info {
void (*fill_super)(struct super_block *, struct nfs_mount_info *);
struct nfs_parsed_mount_data *parsed;
+ struct nfs_clone_mount *cloned;
};
static void nfs_umount_begin(struct super_block *);
@@ -2160,8 +2161,9 @@ static void nfs_fill_super(struct super_block *sb,
* Finish setting up a cloned NFS2/3 superblock
*/
static void nfs_clone_super(struct super_block *sb,
- const struct super_block *old_sb)
+ struct nfs_mount_info *mount_info)
{
+ const struct super_block *old_sb = mount_info->cloned->sb;
struct nfs_server *server = NFS_SB(sb);
sb->s_blocksize_bits = old_sb->s_blocksize_bits;
@@ -2454,13 +2456,13 @@ static void nfs_kill_super(struct super_block *s)
}
/*
- * Clone an NFS2/3 server record on xdev traversal (FSID-change)
+ * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
*/
static struct dentry *
-nfs_xdev_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *raw_data)
+nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
+ const char *dev_name, struct nfs_mount_info *mount_info)
{
- struct nfs_clone_mount *data = raw_data;
+ struct nfs_clone_mount *data = mount_info->cloned;
struct super_block *s;
struct nfs_server *server;
struct dentry *mntroot;
@@ -2470,7 +2472,7 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags,
};
int error;
- dprintk("--> nfs_xdev_mount()\n");
+ dprintk("--> nfs_xdev_mount_common()\n");
/* create a new volume representation */
server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
@@ -2505,7 +2507,7 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags,
if (!s->s_root) {
/* initial superblock/root creation */
- nfs_clone_super(s, data->sb);
+ mount_info->fill_super(s, mount_info);
nfs_get_cache_cookie(s, NULL, data);
}
@@ -2525,13 +2527,13 @@ nfs_xdev_mount(struct file_system_type *fs_type, int flags,
/* clone any lsm security options from the parent to the new sb */
security_sb_clone_mnt_opts(data->sb, s);
- dprintk("<-- nfs_xdev_mount() = 0\n");
+ dprintk("<-- nfs_xdev_mount_common() = 0\n");
return mntroot;
out_err_nosb:
nfs_free_server(server);
out_err_noserver:
- dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
+ dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
return ERR_PTR(error);
error_splat_super:
@@ -2539,18 +2541,33 @@ error_splat_super:
bdi_unregister(&server->backing_dev_info);
error_splat_bdi:
deactivate_locked_super(s);
- dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
+ dprintk("<-- nfs_xdev_mount_common() = %d [splat]\n", error);
return ERR_PTR(error);
}
+/*
+ * Clone an NFS2/3 server record on xdev traversal (FSID-change)
+ */
+static struct dentry *
+nfs_xdev_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *raw_data)
+{
+ struct nfs_mount_info mount_info = {
+ .fill_super = nfs_clone_super,
+ .cloned = raw_data,
+ };
+ return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
+}
+
#ifdef CONFIG_NFS_V4
/*
* Finish setting up a cloned NFS4 superblock
*/
static void nfs4_clone_super(struct super_block *sb,
- const struct super_block *old_sb)
+ struct nfs_mount_info *mount_info)
{
+ const struct super_block *old_sb = mount_info->cloned->sb;
sb->s_blocksize_bits = old_sb->s_blocksize_bits;
sb->s_blocksize = old_sb->s_blocksize;
sb->s_maxbytes = old_sb->s_maxbytes;
@@ -2930,86 +2947,11 @@ static struct dentry *
nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data)
{
- struct nfs_clone_mount *data = raw_data;
- struct super_block *s;
- struct nfs_server *server;
- struct dentry *mntroot;
- int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
- struct nfs_sb_mountdata sb_mntdata = {
- .mntflags = flags,
+ struct nfs_mount_info mount_info = {
+ .fill_super = nfs4_clone_super,
+ .cloned = raw_data,
};
- int error;
-
- dprintk("--> nfs4_xdev_mount()\n");
-
- /* create a new volume representation */
- server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
- if (IS_ERR(server)) {
- error = PTR_ERR(server);
- goto out_err_noserver;
- }
- sb_mntdata.server = server;
-
- if (server->flags & NFS_MOUNT_UNSHARED)
- compare_super = NULL;
-
- /* -o noac implies -o sync */
- if (server->flags & NFS_MOUNT_NOAC)
- sb_mntdata.mntflags |= MS_SYNCHRONOUS;
-
- /* Get a superblock - note that we may end up sharing one that already exists */
- s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
- if (IS_ERR(s)) {
- error = PTR_ERR(s);
- goto out_err_nosb;
- }
-
- if (s->s_fs_info != server) {
- nfs_free_server(server);
- server = NULL;
- } else {
- error = nfs_bdi_register(server);
- if (error)
- goto error_splat_bdi;
- }
-
- if (!s->s_root) {
- /* initial superblock/root creation */
- nfs4_clone_super(s, data->sb);
- nfs_get_cache_cookie(s, NULL, data);
- }
-
- mntroot = nfs_get_root(s, data->fh, dev_name);
- if (IS_ERR(mntroot)) {
- error = PTR_ERR(mntroot);
- goto error_splat_super;
- }
- if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
- dput(mntroot);
- error = -ESTALE;
- goto error_splat_super;
- }
-
- s->s_flags |= MS_ACTIVE;
-
- security_sb_clone_mnt_opts(data->sb, s);
-
- dprintk("<-- nfs4_xdev_mount() = 0\n");
- return mntroot;
-
-out_err_nosb:
- nfs_free_server(server);
-out_err_noserver:
- dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
- return ERR_PTR(error);
-
-error_splat_super:
- if (server && !s->s_root)
- bdi_unregister(&server->backing_dev_info);
-error_splat_bdi:
- deactivate_locked_super(s);
- dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
- return ERR_PTR(error);
+ return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
}
static struct dentry *
--
1.7.10.1
--
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