Skip to content

Commit

Permalink
NFS: Create a common fs_mount() function
Browse files Browse the repository at this point in the history 
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>
  • Loading branch information
Bryan Schumaker authored and Trond Myklebust committed May 15, 2012
1 parent 586f95c commit c40f8d1
Showing 1 changed file with 76 additions and 109 deletions.
185 changes: 76 additions & 109 deletions fs/nfs/super.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -277,6 +277,11 @@ static match_table_t nfs_vers_tokens = {
{ Opt_vers_err, NULL }
};

struct nfs_mount_info {
void (*fill_super)(struct super_block *, struct nfs_mount_info *);
struct nfs_parsed_mount_data *parsed;
};

static void nfs_umount_begin(struct super_block *);
static int nfs_statfs(struct dentry *, struct kstatfs *);
static int nfs_show_options(struct seq_file *, struct dentry *);
Expand Down Expand Up @@ -2129,8 +2134,9 @@ static inline void nfs_initialise_sb(struct super_block *sb)
* Finish setting up an NFS2/3 superblock
*/
static void nfs_fill_super(struct super_block *sb,
struct nfs_parsed_mount_data *data)
struct nfs_mount_info *mount_info)
{
struct nfs_parsed_mount_data *data = mount_info->parsed;
struct nfs_server *server = NFS_SB(sb);

sb->s_blocksize_bits = 0;
Expand Down Expand Up @@ -2304,47 +2310,21 @@ static int nfs_bdi_register(struct nfs_server *server)
return bdi_register_dev(&server->backing_dev_info, server->s_dev);
}

static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data)
static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
struct nfs_server *server,
int flags, const char *dev_name,
struct nfs_fh *mntfh,
struct nfs_mount_info *mount_info)
{
struct nfs_server *server = NULL;
struct super_block *s;
struct nfs_parsed_mount_data *data;
struct nfs_fh *mntfh;
struct dentry *mntroot = ERR_PTR(-ENOMEM);
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
.server = server,
};
int error;

data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
mntfh = nfs_alloc_fhandle();
if (data == NULL || mntfh == NULL)
goto out;

/* Validate the mount data */
error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
if (error < 0) {
mntroot = ERR_PTR(error);
goto out;
}

#ifdef CONFIG_NFS_V4
if (data->version == 4) {
mntroot = nfs4_try_mount(flags, dev_name, data);
goto out;
}
#endif /* CONFIG_NFS_V4 */

/* Get a volume representation */
server = nfs_create_server(data, mntfh);
if (IS_ERR(server)) {
mntroot = ERR_CAST(server);
goto out;
}
sb_mntdata.server = server;

if (server->flags & NFS_MOUNT_UNSHARED)
compare_super = NULL;

Expand Down Expand Up @@ -2372,23 +2352,21 @@ static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,

if (!s->s_root) {
/* initial superblock/root creation */
nfs_fill_super(s, data);
nfs_get_cache_cookie(s, data, NULL);
mount_info->fill_super(s, mount_info);
nfs_get_cache_cookie(s, mount_info->parsed, NULL);
}

mntroot = nfs_get_root(s, mntfh, dev_name);
if (IS_ERR(mntroot))
goto error_splat_super;

error = security_sb_set_mnt_opts(s, &data->lsm_opts);
error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
if (error)
goto error_splat_root;

s->s_flags |= MS_ACTIVE;

out:
nfs_free_parsed_mount_data(data);
nfs_free_fhandle(mntfh);
return mntroot;

out_err_nosb:
Expand All @@ -2406,6 +2384,52 @@ static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
goto out;
}

static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data)
{
struct nfs_server *server;
struct nfs_parsed_mount_data *data = NULL;
struct nfs_mount_info mount_info = {
.fill_super = nfs_fill_super,
};
struct nfs_fh *mntfh;
struct dentry *mntroot = ERR_PTR(-ENOMEM);
int error;

data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
mntfh = nfs_alloc_fhandle();
if (data == NULL || mntfh == NULL)
goto out;

/* Validate the mount data */
error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
if (error < 0) {
mntroot = ERR_PTR(error);
goto out;
}
mount_info.parsed = data;

#ifdef CONFIG_NFS_V4
if (data->version == 4) {
mntroot = nfs4_try_mount(flags, dev_name, data);
goto out;
}
#endif /* CONFIG_NFS_V4 */

/* Get a volume representation */
server = nfs_create_server(data, mntfh);
if (IS_ERR(server)) {
mntroot = ERR_CAST(server);
goto out;
}

mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mntfh, &mount_info);
out:
nfs_free_parsed_mount_data(data);
nfs_free_fhandle(mntfh);
return mntroot;
}

/*
* Ensure that we unregister the bdi before kill_anon_super
* releases the device name
Expand Down Expand Up @@ -2544,7 +2568,8 @@ static void nfs4_clone_super(struct super_block *sb,
/*
* Set up an NFS4 superblock
*/
static void nfs4_fill_super(struct super_block *sb)
static void nfs4_fill_super(struct super_block *sb,
struct nfs_mount_info *mount_info)
{
sb->s_time_gran = 1;
sb->s_op = &nfs4_sops;
Expand Down Expand Up @@ -2696,89 +2721,31 @@ static struct dentry *
nfs4_remote_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data)
{
struct nfs_parsed_mount_data *data = raw_data;
struct super_block *s;
struct nfs_mount_info mount_info = {
.fill_super = nfs4_fill_super,
.parsed = raw_data,
};
struct nfs_server *server;
struct nfs_fh *mntfh;
struct dentry *mntroot;
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
struct nfs_sb_mountdata sb_mntdata = {
.mntflags = flags,
};
int error = -ENOMEM;
struct dentry *mntroot = ERR_PTR(-ENOMEM);

mntfh = nfs_alloc_fhandle();
if (data == NULL || mntfh == NULL)
if (mount_info.parsed == NULL || mntfh == NULL)
goto out;

/* Get a volume representation */
server = nfs4_create_server(data, mntfh);
server = nfs4_create_server(mount_info.parsed, mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
mntroot = ERR_CAST(server);
goto out;
}
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_free;
}

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_fill_super(s);
nfs_get_cache_cookie(s, data, NULL);
}

mntroot = nfs_get_root(s, mntfh, dev_name);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}

error = security_sb_set_mnt_opts(s, &data->lsm_opts);
if (error)
goto error_splat_root;

s->s_flags |= MS_ACTIVE;

nfs_free_fhandle(mntfh);
return mntroot;
mntroot = nfs_fs_mount_common(fs_type, server, flags,
dev_name, mntfh, &mount_info);

out:
nfs_free_fhandle(mntfh);
return ERR_PTR(error);

out_free:
nfs_free_server(server);
goto out;

error_splat_root:
dput(mntroot);
error_splat_super:
if (server && !s->s_root)
bdi_unregister(&server->backing_dev_info);
error_splat_bdi:
deactivate_locked_super(s);
goto out;
return mntroot;
}

static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
Expand Down Expand Up @@ -3099,7 +3066,7 @@ nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,

if (!s->s_root) {
/* initial superblock/root creation */
nfs4_fill_super(s);
nfs4_fill_super(s, NULL);
nfs_get_cache_cookie(s, NULL, data);
}

Expand Down

0 comments on commit c40f8d1

Please sign in to comment.