static struct super_block *jffs2_get_sb_mtd(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *data, struct mtd_info *mtd)
{
struct super_block *sb;
struct jffs2_sb_info *c;
int ret;
c = kmalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return ERR_PTR(-ENOMEM);
memset(c, 0, sizeof(*c));
c->mtd = mtd;
sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
if (IS_ERR(sb))
goto out_put;
if (sb->s_root) {
/* New mountpoint for JFFS2 which is already mounted */
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
mtd->index, mtd->name));
goto out_put;
}
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
mtd->index, mtd->name));
/* Initialize JFFS2 superblock locks, the further initialization will be
* done later */
init_MUTEX(&c->alloc_sem);
init_MUTEX(&c->erase_free_sem);
init_waitqueue_head(&c->erase_wait);
init_waitqueue_head(&c->inocache_wq);
spin_lock_init(&c->erase_completion_lock);
spin_lock_init(&c->inocache_lock);
sb->s_op = &jffs2_super_operations;
sb->s_flags = flags | MS_NOATIME;
ret = jffs2_do_fill_super(sb, data, (flags&MS_VERBOSE)?1:0);
if (ret) {
/* Failure case... */
up_write(&sb->s_umount);
deactivate_super(sb);
return ERR_PTR(ret);
}
sb->s_flags |= MS_ACTIVE;
return sb;
out_put:
kfree(c);
put_mtd_device(mtd);
return sb;
}
void
cifs_sb_deactive(struct super_block *sb)
{
struct cifs_sb_info *server = CIFS_SB(sb);
if (atomic_dec_and_test(&server->active))
deactivate_super(sb);
}
int
zfsctl_lookup_objset(struct super_block *sb, uint64_t objsetid, zfs_sb_t **zsbp)
{
zfs_sb_t *zsb = sb->s_fs_info;
struct super_block *sbp;
zfs_snapentry_t *sep;
uint64_t id;
int error;
ASSERT(zsb->z_ctldir != NULL);
mutex_enter(&zsb->z_ctldir_lock);
/*
* Verify that the snapshot is mounted.
*/
sep = avl_first(&zsb->z_ctldir_snaps);
while (sep != NULL) {
error = dmu_snapshot_lookup(zsb->z_os, sep->se_name, &id);
if (error)
goto out;
if (id == objsetid)
break;
sep = AVL_NEXT(&zsb->z_ctldir_snaps, sep);
}
if (sep != NULL) {
/*
* Lookup the mounted root rather than the covered mount
* point. This may fail if the snapshot has just been
* unmounted by an unrelated user space process. This
* race cannot occur to an expired mount point because
* we hold the zsb->z_ctldir_lock to prevent the race.
*/
sbp = zpl_sget(&zpl_fs_type, zfsctl_test_super,
zfsctl_set_super, 0, &id);
if (IS_ERR(sbp)) {
error = -PTR_ERR(sbp);
} else {
*zsbp = sbp->s_fs_info;
deactivate_super(sbp);
}
} else {
error = EINVAL;
}
out:
mutex_exit(&zsb->z_ctldir_lock);
ASSERT3S(error, >=, 0);
return (error);
}
static int proc_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
int err;
struct super_block *sb;
struct pid_namespace *ns;
struct proc_inode *ei;
if (proc_mnt) {
/* Seed the root directory with a pid so it doesn't need
* to be special in base.c. I would do this earlier but
* the only task alive when /proc is mounted the first time
* is the init_task and it doesn't have any pids.
*/
ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode);
if (!ei->pid)
ei->pid = find_get_pid(1);
}
if (flags & MS_KERNMOUNT)
ns = (struct pid_namespace *)data;
else
ns = current->nsproxy->pid_ns;
sb = sget(fs_type, proc_test_super, proc_set_super, ns);
if (IS_ERR(sb))
return PTR_ERR(sb);
if (!sb->s_root) {
sb->s_flags = flags;
err = proc_fill_super(sb);
if (err) {
up_write(&sb->s_umount);
deactivate_super(sb);
return err;
}
ei = PROC_I(sb->s_root->d_inode);
if (!ei->pid) {
rcu_read_lock();
ei->pid = get_pid(find_pid_ns(1, ns));
rcu_read_unlock();
}
sb->s_flags |= MS_ACTIVE;
ns->proc_mnt = mnt;
}
return simple_set_mnt(mnt, sb);
}
static struct super_block *jffs2_get_sb_mtd(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *data, struct mtd_info *mtd)
{
struct super_block *sb;
struct jffs2_sb_info *c;
int ret;
c = kmalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return ERR_PTR(-ENOMEM);
memset(c, 0, sizeof(*c));
c->mtd = mtd;
sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
if (IS_ERR(sb))
goto out_put;
if (sb->s_root) {
/* New mountpoint for JFFS2 which is already mounted */
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
mtd->index, mtd->name));
goto out_put;
}
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
mtd->index, mtd->name));
sb->s_op = &jffs2_super_operations;
ret = jffs2_do_fill_super(sb, data, (flags&MS_VERBOSE)?1:0);
if (ret) {
/* Failure case... */
up_write(&sb->s_umount);
deactivate_super(sb);
return ERR_PTR(ret);
}
sb->s_flags |= MS_ACTIVE;
return sb;
out_put:
kfree(c);
put_mtd_device(mtd);
return sb;
}
/*
* get a superblock on an MTD-backed filesystem
*/
static int get_sb_mtd_aux(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
struct mtd_info *mtd,
int (*fill_super)(struct super_block *, void *, int),
struct vfsmount *mnt)
{
struct super_block *sb;
int ret;
sb = sget(fs_type, get_sb_mtd_compare, get_sb_mtd_set, mtd);
if (IS_ERR(sb))
goto out_error;
if (sb->s_root)
goto already_mounted;
/* fresh new superblock */
DEBUG(1, "MTDSB: New superblock for device %d (\"%s\")\n",
mtd->index, mtd->name);
sb->s_flags = flags;
ret = fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
if (ret < 0) {
up_write(&sb->s_umount);
deactivate_super(sb);
return ret;
}
/* go */
sb->s_flags |= MS_ACTIVE;
return simple_set_mnt(mnt, sb);
/* new mountpoint for an already mounted superblock */
already_mounted:
DEBUG(1, "MTDSB: Device %d (\"%s\") is already mounted\n",
mtd->index, mtd->name);
ret = simple_set_mnt(mnt, sb);
goto out_put;
out_error:
ret = PTR_ERR(sb);
out_put:
put_mtd_device(mtd);
return ret;
}
static
struct super_block *
perfctr_get_sb_pseudo(struct file_system_type *fs_type, char *name,
struct super_operations *ops, unsigned long magic)
{
struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
static struct super_operations default_ops = {.statfs = simple_statfs};
struct dentry *dentry;
struct inode *root;
struct qstr d_name = {.name = name, .len = strlen(name)};
if (IS_ERR(s))
return s;
s->s_flags = MS_NOUSER;
s->s_maxbytes = ~0ULL;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = magic;
s->s_op = ops ? ops : &default_ops;
root = new_inode(s);
if (!root)
goto Enomem;
root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
root->i_uid = root->i_gid = 0;
root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
dentry = d_alloc(NULL, &d_name);
if (!dentry) {
iput(root);
goto Enomem;
}
dentry->d_sb = s;
dentry->d_parent = dentry;
d_instantiate(dentry, root);
s->s_root = dentry;
s->s_flags |= MS_ACTIVE;
return s;
Enomem:
up_write(&s->s_umount);
deactivate_super(s);
return ERR_PTR(-ENOMEM);
}
static struct super_block *
cifs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
int rc;
struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
if (IS_ERR(sb))
return sb;
sb->s_flags = flags;
rc = cifs_read_super(sb, data, dev_name, flags & MS_VERBOSE ? 1 : 0);
if (rc) {
up_write(&sb->s_umount);
deactivate_super(sb);
return ERR_PTR(rc);
}
sb->s_flags |= MS_ACTIVE;
return sb;
}
/**
* put_fs_context - Dispose of a superblock configuration context.
* @fc: The context to dispose of.
*/
void put_fs_context(struct fs_context *fc)
{
struct super_block *sb;
if (fc->root) {
sb = fc->root->d_sb;
dput(fc->root);
fc->root = NULL;
deactivate_super(sb);
}
if (fc->need_free && fc->ops && fc->ops->free)
fc->ops->free(fc);
security_free_mnt_opts(&fc->security);
put_net(fc->net_ns);
put_user_ns(fc->user_ns);
put_cred(fc->cred);
kfree(fc->subtype);
put_fc_log(fc);
put_filesystem(fc->fs_type);
kfree(fc->source);
kfree(fc);
}
static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
struct vfsmount *mnt)
{
struct super_block *sb = NULL;
struct inode *inode = NULL;
struct dentry *root = NULL;
struct v9fs_session_info *v9ses = NULL;
struct p9_stat *st = NULL;
int mode = S_IRWXUGO | S_ISVTX;
uid_t uid = current->fsuid;
gid_t gid = current->fsgid;
struct p9_fid *fid;
int retval = 0;
P9_DPRINTK(P9_DEBUG_VFS, " \n");
st = NULL;
v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
if (!v9ses)
return -ENOMEM;
fid = v9fs_session_init(v9ses, dev_name, data);
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
fid = NULL;
kfree(v9ses);
v9ses = NULL;
goto error;
}
st = p9_client_stat(fid);
if (IS_ERR(st)) {
retval = PTR_ERR(st);
goto error;
}
sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
if (IS_ERR(sb)) {
retval = PTR_ERR(sb);
goto error;
}
v9fs_fill_super(sb, v9ses, flags);
inode = v9fs_get_inode(sb, S_IFDIR | mode);
if (IS_ERR(inode)) {
retval = PTR_ERR(inode);
goto error;
}
inode->i_uid = uid;
inode->i_gid = gid;
root = d_alloc_root(inode);
if (!root) {
retval = -ENOMEM;
goto error;
}
sb->s_root = root;
root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
v9fs_stat2inode(st, root->d_inode, sb);
v9fs_fid_add(root, fid);
kfree(st);
return simple_set_mnt(mnt, sb);
error:
kfree(st);
if (fid)
p9_client_clunk(fid);
if (v9ses) {
v9fs_session_close(v9ses);
kfree(v9ses);
}
if (sb) {
up_write(&sb->s_umount);
deactivate_super(sb);
}
return retval;
}
static int dazukofs_fill_super(struct super_block *sb, void *data, int silent)
{
struct dazukofs_sb_info *sbi;
struct dentry *root;
static const struct qstr name = { .name = "/", .len = 1 };
struct dazukofs_dentry_info *di;
sbi = kmem_cache_zalloc(dazukofs_sb_info_cachep, GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_op = &dazukofs_sops;
root = d_alloc(NULL, &name);
if (!root) {
kmem_cache_free(dazukofs_sb_info_cachep, sbi);
return -ENOMEM;
}
sb->s_root = root;
sb->s_root->d_op = &dazukofs_dops;
sb->s_root->d_sb = sb;
sb->s_root->d_parent = sb->s_root;
di = kmem_cache_zalloc(dazukofs_dentry_info_cachep, GFP_KERNEL);
if (!di) {
kmem_cache_free(dazukofs_sb_info_cachep, sbi);
dput(sb->s_root);
return -ENOMEM;
}
set_dentry_private(sb->s_root, di);
set_sb_private(sb, sbi);
return 0;
}
static int dazukofs_read_super(struct super_block *sb, const char *dev_name)
{
struct nameidata nd;
struct dentry *lower_root;
struct vfsmount *lower_mnt;
int err;
memset(&nd, 0, sizeof(struct nameidata));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
err = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd.path);
#else
err = path_lookup(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
#endif
if (err)
return err;
lower_root = dget(nd.path.dentry);
lower_mnt = mntget(nd.path.mnt);
if (IS_ERR(lower_root)) {
err = PTR_ERR(lower_root);
goto out_put;
}
if (!lower_root->d_inode) {
err = -ENOENT;
goto out_put;
}
if (!S_ISDIR(lower_root->d_inode->i_mode)) {
err = -EINVAL;
goto out_put;
}
set_lower_sb(sb, lower_root->d_sb);
sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
set_lower_dentry(sb->s_root, lower_root, lower_mnt);
err = dazukofs_interpose(lower_root, sb->s_root, sb, 0);
if (err)
goto out_put;
goto out;
out_put:
dput(lower_root);
mntput(lower_mnt);
out:
path_put(&nd.path);
return err;
}
// FIXME!
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
static struct dentry* dazukofs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
return mount_nodev(fs_type, flags, data, dazukofs_fill_super);
}
#else
static int dazukofs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
struct vfsmount *mnt)
{
struct super_block *sb;
int err;
err = get_sb_nodev(fs_type, flags, data, dazukofs_fill_super, mnt);
if (err)
goto out;
sb = mnt->mnt_sb;
err = dazukofs_parse_mount_options(data, sb);
if (err)
goto out_abort;
err = dazukofs_read_super(sb, dev_name);
if (err)
goto out_abort;
goto out;
out_abort:
dput(sb->s_root);
up_write(&sb->s_umount);
deactivate_super(sb);
out:
return err;
}
#endif
static void init_once(void *data)
{
struct dazukofs_inode_info *inode_info =
(struct dazukofs_inode_info *)data;
memset(inode_info, 0, sizeof(struct dazukofs_inode_info));
inode_init_once(&(inode_info->vfs_inode));
}
static void destroy_caches(void)
{
if (dazukofs_inode_info_cachep) {
kmem_cache_destroy(dazukofs_inode_info_cachep);
dazukofs_inode_info_cachep = NULL;
}
if (dazukofs_sb_info_cachep) {
kmem_cache_destroy(dazukofs_sb_info_cachep);
dazukofs_sb_info_cachep = NULL;
}
if (dazukofs_dentry_info_cachep) {
kmem_cache_destroy(dazukofs_dentry_info_cachep);
dazukofs_dentry_info_cachep = NULL;
}
if (dazukofs_file_info_cachep) {
kmem_cache_destroy(dazukofs_file_info_cachep);
dazukofs_file_info_cachep = NULL;
}
}
static int init_caches(void)
{
dazukofs_inode_info_cachep =
kmem_cache_create("dazukofs_inode_info_cache",
sizeof(struct dazukofs_inode_info), 0,
SLAB_HWCACHE_ALIGN,
init_once);
if (!dazukofs_inode_info_cachep)
goto out_nomem;
dazukofs_sb_info_cachep =
kmem_cache_create("dazukofs_sb_info_cache",
sizeof(struct dazukofs_sb_info), 0,
SLAB_HWCACHE_ALIGN,
NULL);
if (!dazukofs_sb_info_cachep)
goto out_nomem;
dazukofs_dentry_info_cachep =
kmem_cache_create("dazukofs_dentry_info_cache",
sizeof(struct dazukofs_dentry_info), 0,
SLAB_HWCACHE_ALIGN,
NULL);
if (!dazukofs_dentry_info_cachep)
goto out_nomem;
dazukofs_file_info_cachep =
kmem_cache_create("dazukofs_file_info_cache",
sizeof(struct dazukofs_file_info), 0,
SLAB_HWCACHE_ALIGN,
NULL);
if (!dazukofs_file_info_cachep)
goto out_nomem;
return 0;
out_nomem:
destroy_caches();
return -ENOMEM;
}
void devpts_release(struct pts_fs_info *fsi)
{
deactivate_super(fsi->sb);
}
static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
struct vfsmount *mnt)
{
struct super_block *sb = NULL;
struct v9fs_fcall *fcall = NULL;
struct inode *inode = NULL;
struct dentry *root = NULL;
struct v9fs_session_info *v9ses = NULL;
struct v9fs_fid *root_fid = NULL;
int mode = S_IRWXUGO | S_ISVTX;
uid_t uid = current->fsuid;
gid_t gid = current->fsgid;
int stat_result = 0;
int newfid = 0;
int retval = 0;
dprintk(DEBUG_VFS, " \n");
v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
if (!v9ses)
return -ENOMEM;
if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
dprintk(DEBUG_ERROR, "problem initiating session\n");
retval = newfid;
goto out_free_session;
}
sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
if (IS_ERR(sb)) {
retval = PTR_ERR(sb);
goto out_close_session;
}
v9fs_fill_super(sb, v9ses, flags);
inode = v9fs_get_inode(sb, S_IFDIR | mode);
if (IS_ERR(inode)) {
retval = PTR_ERR(inode);
goto put_back_sb;
}
inode->i_uid = uid;
inode->i_gid = gid;
root = d_alloc_root(inode);
if (!root) {
retval = -ENOMEM;
goto put_back_sb;
}
sb->s_root = root;
stat_result = v9fs_t_stat(v9ses, newfid, &fcall);
if (stat_result < 0) {
dprintk(DEBUG_ERROR, "stat error\n");
v9fs_t_clunk(v9ses, newfid);
} else {
/* Setup the Root Inode */
root_fid = v9fs_fid_create(v9ses, newfid);
if (root_fid == NULL) {
retval = -ENOMEM;
goto put_back_sb;
}
retval = v9fs_fid_insert(root_fid, root);
if (retval < 0) {
kfree(fcall);
goto put_back_sb;
}
root_fid->qid = fcall->params.rstat.stat.qid;
root->d_inode->i_ino =
v9fs_qid2ino(&fcall->params.rstat.stat.qid);
v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb);
}
kfree(fcall);
if (stat_result < 0) {
retval = stat_result;
goto put_back_sb;
}
return simple_set_mnt(mnt, sb);
out_close_session:
v9fs_session_close(v9ses);
out_free_session:
kfree(v9ses);
return retval;
put_back_sb:
/* deactivate_super calls v9fs_kill_super which will frees the rest */
up_write(&sb->s_umount);
deactivate_super(sb);
return retval;
}
/*
* Clone an NFS4 server record on xdev traversal (FSID-change)
*/
static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
struct vfsmount *mnt)
{
struct nfs_clone_mount *data = raw_data;
struct super_block *s;
struct nfs_server *server;
struct dentry *mntroot;
int error;
dprintk("--> nfs4_xdev_get_sb()\n");
/* create a new volume representation */
server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out_err_noserver;
}
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_err_nosb;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
}
if (!s->s_root) {
/* initial superblock/root creation */
s->s_flags = flags;
nfs4_clone_super(s, data->sb);
}
mntroot = nfs4_get_root(s, data->fh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
dprintk("<-- nfs4_xdev_get_sb() = 0\n");
return 0;
out_err_nosb:
nfs_free_server(server);
out_err_noserver:
dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
return error;
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
return error;
}
/*
* Get the superblock for an NFS4 mountpoint
*/
static int nfs4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
{
struct nfs4_mount_data *data = raw_data;
struct super_block *s;
struct nfs_server *server;
struct sockaddr_in addr;
rpc_authflavor_t authflavour;
struct nfs_fh mntfh;
struct dentry *mntroot;
char *mntpath = NULL, *hostname = NULL, ip_addr[16];
void *p;
int error;
if (data == NULL) {
dprintk("%s: missing data argument\n", __FUNCTION__);
return -EINVAL;
}
if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
dprintk("%s: bad mount version\n", __FUNCTION__);
return -EINVAL;
}
/* We now require that the mount process passes the remote address */
if (data->host_addrlen != sizeof(addr))
return -EINVAL;
if (copy_from_user(&addr, data->host_addr, sizeof(addr)))
return -EFAULT;
if (addr.sin_family != AF_INET ||
addr.sin_addr.s_addr == INADDR_ANY
) {
dprintk("%s: mount program didn't pass remote IP address!\n",
__FUNCTION__);
return -EINVAL;
}
/* RFC3530: The default port for NFS is 2049 */
if (addr.sin_port == 0)
addr.sin_port = htons(NFS_PORT);
/* Grab the authentication type */
authflavour = RPC_AUTH_UNIX;
if (data->auth_flavourlen != 0) {
if (data->auth_flavourlen != 1) {
dprintk("%s: Invalid number of RPC auth flavours %d.\n",
__FUNCTION__, data->auth_flavourlen);
error = -EINVAL;
goto out_err_noserver;
}
if (copy_from_user(&authflavour, data->auth_flavours,
sizeof(authflavour))) {
error = -EFAULT;
goto out_err_noserver;
}
}
p = nfs_copy_user_string(NULL, &data->hostname, 256);
if (IS_ERR(p))
goto out_err;
hostname = p;
p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
if (IS_ERR(p))
goto out_err;
mntpath = p;
dprintk("MNTPATH: %s\n", mntpath);
p = nfs_copy_user_string(ip_addr, &data->client_addr,
sizeof(ip_addr) - 1);
if (IS_ERR(p))
goto out_err;
/* Get a volume representation */
server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
authflavour, &mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out_err_noserver;
}
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_free;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
}
if (!s->s_root) {
/* initial superblock/root creation */
s->s_flags = flags;
nfs4_fill_super(s);
}
mntroot = nfs4_get_root(s, &mntfh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
kfree(mntpath);
kfree(hostname);
return 0;
out_err:
error = PTR_ERR(p);
goto out_err_noserver;
out_free:
nfs_free_server(server);
out_err_noserver:
kfree(mntpath);
kfree(hostname);
return error;
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
goto out_err_noserver;
}
static int nfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
{
struct nfs_server *server = NULL;
struct super_block *s;
struct nfs_fh mntfh;
struct nfs_mount_data *data = raw_data;
struct dentry *mntroot;
int error;
/* Validate the mount data */
error = nfs_validate_mount_data(data, &mntfh);
if (error < 0)
return error;
/* Get a volume representation */
server = nfs_create_server(data, &mntfh);
if (IS_ERR(server)) {
error = PTR_ERR(server);
goto out_err_noserver;
}
/* Get a superblock - note that we may end up sharing one that already exists */
s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
if (IS_ERR(s)) {
error = PTR_ERR(s);
goto out_err_nosb;
}
if (s->s_fs_info != server) {
nfs_free_server(server);
server = NULL;
}
if (!s->s_root) {
/* initial superblock/root creation */
s->s_flags = flags;
nfs_fill_super(s, data);
}
mntroot = nfs_get_root(s, &mntfh);
if (IS_ERR(mntroot)) {
error = PTR_ERR(mntroot);
goto error_splat_super;
}
s->s_flags |= MS_ACTIVE;
mnt->mnt_sb = s;
mnt->mnt_root = mntroot;
return 0;
out_err_nosb:
nfs_free_server(server);
out_err_noserver:
return error;
error_splat_super:
up_write(&s->s_umount);
deactivate_super(s);
return error;
}
/*
* Find a superblock for the given device / mount point.
*
* Note: This is based on get_sb_bdev from fs/super.c with a few additions
* for multiple device setup. Make sure to keep it in sync.
*/
static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
char *subvol_name = NULL;
struct block_device *bdev = NULL;
struct super_block *s;
struct dentry *root;
struct btrfs_fs_devices *fs_devices = NULL;
fmode_t mode = FMODE_READ;
int error = 0;
if (!(flags & MS_RDONLY))
mode |= FMODE_WRITE;
error = btrfs_parse_early_options(data, mode, fs_type,
&subvol_name, &fs_devices);
if (error)
return error;
error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices);
if (error)
goto error_free_subvol_name;
error = btrfs_open_devices(fs_devices, mode, fs_type);
if (error)
goto error_free_subvol_name;
if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
error = -EACCES;
goto error_close_devices;
}
bdev = fs_devices->latest_bdev;
s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
if (IS_ERR(s))
goto error_s;
if (s->s_root) {
if ((flags ^ s->s_flags) & MS_RDONLY) {
up_write(&s->s_umount);
deactivate_super(s);
error = -EBUSY;
goto error_close_devices;
}
btrfs_close_devices(fs_devices);
} else {
char b[BDEVNAME_SIZE];
s->s_flags = flags;
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
error = btrfs_fill_super(s, fs_devices, data,
flags & MS_SILENT ? 1 : 0);
if (error) {
up_write(&s->s_umount);
deactivate_super(s);
goto error_free_subvol_name;
}
btrfs_sb(s)->fs_info->bdev_holder = fs_type;
s->s_flags |= MS_ACTIVE;
}
if (!strcmp(subvol_name, "."))
root = dget(s->s_root);
else {
mutex_lock(&s->s_root->d_inode->i_mutex);
root = lookup_one_len(subvol_name, s->s_root,
strlen(subvol_name));
mutex_unlock(&s->s_root->d_inode->i_mutex);
if (IS_ERR(root)) {
up_write(&s->s_umount);
deactivate_super(s);
error = PTR_ERR(root);
goto error_free_subvol_name;
}
if (!root->d_inode) {
dput(root);
up_write(&s->s_umount);
deactivate_super(s);
error = -ENXIO;
goto error_free_subvol_name;
}
}
mnt->mnt_sb = s;
mnt->mnt_root = root;
kfree(subvol_name);
return 0;
error_s:
error = PTR_ERR(s);
error_close_devices:
btrfs_close_devices(fs_devices);
error_free_subvol_name:
kfree(subvol_name);
return error;
}
static int jffs2_get_sb_mtd(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *data, struct mtd_info *mtd,
struct vfsmount *mnt)
{
struct super_block *sb;
struct jffs2_sb_info *c;
int ret;
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
return -ENOMEM;
c->mtd = mtd;
sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
if (IS_ERR(sb))
goto out_error;
if (sb->s_root) {
/* New mountpoint for JFFS2 which is already mounted */
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
mtd->index, mtd->name));
ret = simple_set_mnt(mnt, sb);
goto out_put;
}
D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n",
mtd->index, mtd->name));
/* Initialize JFFS2 superblock locks, the further initialization will be
* done later */
init_MUTEX(&c->alloc_sem);
init_MUTEX(&c->erase_free_sem);
init_waitqueue_head(&c->erase_wait);
init_waitqueue_head(&c->inocache_wq);
spin_lock_init(&c->erase_completion_lock);
spin_lock_init(&c->inocache_lock);
sb->s_op = &jffs2_super_operations;
sb->s_flags = flags | MS_NOATIME;
sb->s_xattr = jffs2_xattr_handlers;
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
sb->s_flags |= MS_POSIXACL;
#endif
ret = jffs2_do_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
if (ret) {
/* Failure case... */
up_write(&sb->s_umount);
deactivate_super(sb);
return ret;
}
sb->s_flags |= MS_ACTIVE;
return simple_set_mnt(mnt, sb);
out_error:
ret = PTR_ERR(sb);
out_put:
kfree(c);
put_mtd_device(mtd);
return ret;
}
static int
nilfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
struct nilfs_super_data sd;
struct super_block *s;
struct the_nilfs *nilfs;
int err, need_to_close = 1;
sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type);
if (IS_ERR(sd.bdev))
return PTR_ERR(sd.bdev);
/*
* To get mount instance using sget() vfs-routine, NILFS needs
* much more information than normal filesystems to identify mount
* instance. For snapshot mounts, not only a mount type (ro-mount
* or rw-mount) but also a checkpoint number is required.
*/
sd.cno = 0;
sd.flags = flags;
if (nilfs_identify((char *)data, &sd)) {
err = -EINVAL;
goto failed;
}
nilfs = find_or_create_nilfs(sd.bdev);
if (!nilfs) {
err = -ENOMEM;
goto failed;
}
mutex_lock(&nilfs->ns_mount_mutex);
if (!sd.cno) {
/*
* Check if an exclusive mount exists or not.
* Snapshot mounts coexist with a current mount
* (i.e. rw-mount or ro-mount), whereas rw-mount and
* ro-mount are mutually exclusive.
*/
down_read(&nilfs->ns_super_sem);
if (nilfs->ns_current &&
((nilfs->ns_current->s_super->s_flags ^ flags)
& MS_RDONLY)) {
up_read(&nilfs->ns_super_sem);
err = -EBUSY;
goto failed_unlock;
}
up_read(&nilfs->ns_super_sem);
}
/*
* Find existing nilfs_sb_info struct
*/
sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno);
/*
* Get super block instance holding the nilfs_sb_info struct.
* A new instance is allocated if no existing mount is present or
* existing instance has been unmounted.
*/
s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd);
if (sd.sbi)
nilfs_put_sbinfo(sd.sbi);
if (IS_ERR(s)) {
err = PTR_ERR(s);
goto failed_unlock;
}
if (!s->s_root) {
char b[BDEVNAME_SIZE];
/* New superblock instance created */
s->s_flags = flags;
strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
sb_set_blocksize(s, block_size(sd.bdev));
err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs);
if (err)
goto cancel_new;
s->s_flags |= MS_ACTIVE;
need_to_close = 0;
}
mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
if (need_to_close)
close_bdev_exclusive(sd.bdev, flags);
simple_set_mnt(mnt, s);
return 0;
failed_unlock:
mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
failed:
close_bdev_exclusive(sd.bdev, flags);
return err;
cancel_new:
/* Abandoning the newly allocated superblock */
mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
up_write(&s->s_umount);
deactivate_super(s);
/*
* deactivate_super() invokes close_bdev_exclusive().
* We must finish all post-cleaning before this call;
* put_nilfs() needs the block device.
*/
return err;
}
