NFS: Create a common fs_mount() function
The nfs4_remote_mount() function was only slightly different from the nfs_fs_mount() function used by the generic client. I created a new nfs_mount_info structure to set different parameters to help combine these functions. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker
Trond Myklebust
Родитель
586f95cd4f
Коммит
c40f8d1d35
185
fs/nfs/super.c
185
fs/nfs/super.c
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@ -277,6 +277,11 @@ static match_table_t nfs_vers_tokens = {
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{ Opt_vers_err, NULL }
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};
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struct nfs_mount_info {
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void (*fill_super)(struct super_block *, struct nfs_mount_info *);
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struct nfs_parsed_mount_data *parsed;
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};
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static void nfs_umount_begin(struct super_block *);
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static int nfs_statfs(struct dentry *, struct kstatfs *);
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static int nfs_show_options(struct seq_file *, struct dentry *);
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@ -2129,8 +2134,9 @@ static inline void nfs_initialise_sb(struct super_block *sb)
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* Finish setting up an NFS2/3 superblock
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*/
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static void nfs_fill_super(struct super_block *sb,
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struct nfs_parsed_mount_data *data)
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struct nfs_mount_info *mount_info)
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{
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struct nfs_parsed_mount_data *data = mount_info->parsed;
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struct nfs_server *server = NFS_SB(sb);
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sb->s_blocksize_bits = 0;
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@ -2304,47 +2310,21 @@ static int nfs_bdi_register(struct nfs_server *server)
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return bdi_register_dev(&server->backing_dev_info, server->s_dev);
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}
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static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *raw_data)
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static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
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struct nfs_server *server,
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int flags, const char *dev_name,
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struct nfs_fh *mntfh,
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struct nfs_mount_info *mount_info)
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{
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struct nfs_server *server = NULL;
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struct super_block *s;
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struct nfs_parsed_mount_data *data;
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struct nfs_fh *mntfh;
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struct dentry *mntroot = ERR_PTR(-ENOMEM);
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int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
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struct nfs_sb_mountdata sb_mntdata = {
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.mntflags = flags,
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.server = server,
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};
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int error;
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data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
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mntfh = nfs_alloc_fhandle();
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if (data == NULL || mntfh == NULL)
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goto out;
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/* Validate the mount data */
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error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
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if (error < 0) {
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mntroot = ERR_PTR(error);
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goto out;
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}
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#ifdef CONFIG_NFS_V4
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if (data->version == 4) {
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mntroot = nfs4_try_mount(flags, dev_name, data);
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goto out;
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}
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#endif /* CONFIG_NFS_V4 */
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/* Get a volume representation */
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server = nfs_create_server(data, mntfh);
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if (IS_ERR(server)) {
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mntroot = ERR_CAST(server);
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goto out;
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}
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sb_mntdata.server = server;
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if (server->flags & NFS_MOUNT_UNSHARED)
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compare_super = NULL;
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@ -2372,23 +2352,21 @@ static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
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if (!s->s_root) {
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/* initial superblock/root creation */
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nfs_fill_super(s, data);
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nfs_get_cache_cookie(s, data, NULL);
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mount_info->fill_super(s, mount_info);
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nfs_get_cache_cookie(s, mount_info->parsed, NULL);
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}
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mntroot = nfs_get_root(s, mntfh, dev_name);
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if (IS_ERR(mntroot))
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goto error_splat_super;
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error = security_sb_set_mnt_opts(s, &data->lsm_opts);
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error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
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if (error)
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goto error_splat_root;
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s->s_flags |= MS_ACTIVE;
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out:
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nfs_free_parsed_mount_data(data);
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nfs_free_fhandle(mntfh);
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return mntroot;
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out_err_nosb:
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@ -2406,6 +2384,52 @@ error_splat_bdi:
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goto out;
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}
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static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *raw_data)
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{
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struct nfs_server *server;
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struct nfs_parsed_mount_data *data = NULL;
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struct nfs_mount_info mount_info = {
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.fill_super = nfs_fill_super,
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};
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struct nfs_fh *mntfh;
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struct dentry *mntroot = ERR_PTR(-ENOMEM);
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int error;
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data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
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mntfh = nfs_alloc_fhandle();
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if (data == NULL || mntfh == NULL)
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goto out;
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/* Validate the mount data */
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error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
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if (error < 0) {
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mntroot = ERR_PTR(error);
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goto out;
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}
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mount_info.parsed = data;
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#ifdef CONFIG_NFS_V4
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if (data->version == 4) {
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mntroot = nfs4_try_mount(flags, dev_name, data);
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goto out;
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}
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#endif /* CONFIG_NFS_V4 */
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/* Get a volume representation */
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server = nfs_create_server(data, mntfh);
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if (IS_ERR(server)) {
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mntroot = ERR_CAST(server);
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goto out;
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}
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mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mntfh, &mount_info);
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out:
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nfs_free_parsed_mount_data(data);
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nfs_free_fhandle(mntfh);
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return mntroot;
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}
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/*
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* Ensure that we unregister the bdi before kill_anon_super
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* releases the device name
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@ -2544,7 +2568,8 @@ static void nfs4_clone_super(struct super_block *sb,
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/*
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* Set up an NFS4 superblock
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*/
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static void nfs4_fill_super(struct super_block *sb)
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static void nfs4_fill_super(struct super_block *sb,
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struct nfs_mount_info *mount_info)
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{
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sb->s_time_gran = 1;
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sb->s_op = &nfs4_sops;
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@ -2696,89 +2721,31 @@ static struct dentry *
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nfs4_remote_mount(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *raw_data)
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{
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struct nfs_parsed_mount_data *data = raw_data;
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struct super_block *s;
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struct nfs_mount_info mount_info = {
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.fill_super = nfs4_fill_super,
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.parsed = raw_data,
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};
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struct nfs_server *server;
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struct nfs_fh *mntfh;
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struct dentry *mntroot;
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int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
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struct nfs_sb_mountdata sb_mntdata = {
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.mntflags = flags,
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};
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int error = -ENOMEM;
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struct dentry *mntroot = ERR_PTR(-ENOMEM);
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mntfh = nfs_alloc_fhandle();
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if (data == NULL || mntfh == NULL)
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if (mount_info.parsed == NULL || mntfh == NULL)
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goto out;
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/* Get a volume representation */
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server = nfs4_create_server(data, mntfh);
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server = nfs4_create_server(mount_info.parsed, mntfh);
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if (IS_ERR(server)) {
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error = PTR_ERR(server);
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mntroot = ERR_CAST(server);
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goto out;
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}
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sb_mntdata.server = server;
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if (server->flags & NFS_MOUNT_UNSHARED)
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compare_super = NULL;
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/* -o noac implies -o sync */
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if (server->flags & NFS_MOUNT_NOAC)
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sb_mntdata.mntflags |= MS_SYNCHRONOUS;
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/* Get a superblock - note that we may end up sharing one that already exists */
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s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
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if (IS_ERR(s)) {
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error = PTR_ERR(s);
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goto out_free;
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}
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if (s->s_fs_info != server) {
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nfs_free_server(server);
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server = NULL;
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} else {
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error = nfs_bdi_register(server);
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if (error)
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goto error_splat_bdi;
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}
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if (!s->s_root) {
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/* initial superblock/root creation */
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nfs4_fill_super(s);
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nfs_get_cache_cookie(s, data, NULL);
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}
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mntroot = nfs_get_root(s, mntfh, dev_name);
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if (IS_ERR(mntroot)) {
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error = PTR_ERR(mntroot);
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goto error_splat_super;
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}
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error = security_sb_set_mnt_opts(s, &data->lsm_opts);
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if (error)
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goto error_splat_root;
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s->s_flags |= MS_ACTIVE;
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nfs_free_fhandle(mntfh);
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return mntroot;
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mntroot = nfs_fs_mount_common(fs_type, server, flags,
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dev_name, mntfh, &mount_info);
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out:
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nfs_free_fhandle(mntfh);
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return ERR_PTR(error);
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out_free:
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nfs_free_server(server);
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goto out;
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error_splat_root:
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dput(mntroot);
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error_splat_super:
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if (server && !s->s_root)
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bdi_unregister(&server->backing_dev_info);
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error_splat_bdi:
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deactivate_locked_super(s);
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goto out;
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return mntroot;
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}
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static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
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@ -3099,7 +3066,7 @@ nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
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if (!s->s_root) {
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/* initial superblock/root creation */
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nfs4_fill_super(s);
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nfs4_fill_super(s, NULL);
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nfs_get_cache_cookie(s, NULL, data);
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}
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