2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
5 * Ported the filesystem routines to 2.5.
6 * 2003-02-10 Petr Baudis <pasky@ucw.cz>
10 #include <linux/module.h>
12 #include <linux/pagemap.h>
13 #include <linux/statfs.h>
14 #include <linux/seq_file.h>
19 struct hostfs_inode_info
{
23 struct inode vfs_inode
;
26 static inline struct hostfs_inode_info
*HOSTFS_I(struct inode
*inode
)
28 return list_entry(inode
, struct hostfs_inode_info
, vfs_inode
);
31 #define FILE_HOSTFS_I(file) HOSTFS_I((file)->f_path.dentry->d_inode)
33 int hostfs_d_delete(struct dentry
*dentry
)
38 struct dentry_operations hostfs_dentry_ops
= {
39 .d_delete
= hostfs_d_delete
,
42 /* Changed in hostfs_args before the kernel starts running */
43 static char *root_ino
= "";
44 static int append
= 0;
46 #define HOSTFS_SUPER_MAGIC 0x00c0ffee
48 static const struct inode_operations hostfs_iops
;
49 static const struct inode_operations hostfs_dir_iops
;
50 static const struct address_space_operations hostfs_link_aops
;
53 static int __init
hostfs_args(char *options
, int *add
)
57 ptr
= strchr(options
, ',');
65 ptr
= strchr(options
, ',');
68 if (*options
!= '\0') {
69 if (!strcmp(options
, "append"))
71 else printf("hostfs_args - unsupported option - %s\n",
79 __uml_setup("hostfs=", hostfs_args
,
80 "hostfs=<root dir>,<flags>,...\n"
81 " This is used to set hostfs parameters. The root directory argument\n"
82 " is used to confine all hostfs mounts to within the specified directory\n"
83 " tree on the host. If this isn't specified, then a user inside UML can\n"
84 " mount anything on the host that's accessible to the user that's running\n"
86 " The only flag currently supported is 'append', which specifies that all\n"
87 " files opened by hostfs will be opened in append mode.\n\n"
91 static char *dentry_name(struct dentry
*dentry
, int extra
)
93 struct dentry
*parent
;
99 while (parent
->d_parent
!= parent
) {
100 len
+= parent
->d_name
.len
+ 1;
101 parent
= parent
->d_parent
;
104 root
= HOSTFS_I(parent
->d_inode
)->host_filename
;
106 name
= kmalloc(len
+ extra
+ 1, GFP_KERNEL
);
112 while (parent
->d_parent
!= parent
) {
113 len
-= parent
->d_name
.len
+ 1;
115 strncpy(&name
[len
+ 1], parent
->d_name
.name
,
117 parent
= parent
->d_parent
;
119 strncpy(name
, root
, strlen(root
));
123 static char *inode_name(struct inode
*ino
, int extra
)
125 struct dentry
*dentry
;
127 dentry
= list_entry(ino
->i_dentry
.next
, struct dentry
, d_alias
);
128 return dentry_name(dentry
, extra
);
131 static int read_name(struct inode
*ino
, char *name
)
134 * The non-int inode fields are copied into ints by stat_file and
135 * then copied into the inode because passing the actual pointers
136 * in and having them treated as int * breaks on big-endian machines
139 int i_mode
, i_nlink
, i_blksize
;
140 unsigned long long i_size
;
141 unsigned long long i_ino
;
142 unsigned long long i_blocks
;
144 err
= stat_file(name
, &i_ino
, &i_mode
, &i_nlink
, &ino
->i_uid
,
145 &ino
->i_gid
, &i_size
, &ino
->i_atime
, &ino
->i_mtime
,
146 &ino
->i_ctime
, &i_blksize
, &i_blocks
, -1);
151 ino
->i_mode
= i_mode
;
152 ino
->i_nlink
= i_nlink
;
153 ino
->i_size
= i_size
;
154 ino
->i_blocks
= i_blocks
;
158 static char *follow_link(char *link
)
161 char *name
, *resolved
, *end
;
166 name
= kmalloc(len
, GFP_KERNEL
);
170 n
= do_readlink(link
, name
, len
);
182 end
= strrchr(link
, '/');
187 len
= strlen(link
) + strlen(name
) + 1;
189 resolved
= kmalloc(len
, GFP_KERNEL
);
190 if (resolved
== NULL
) {
195 sprintf(resolved
, "%s%s", link
, name
);
206 static int hostfs_read_inode(struct inode
*ino
)
212 * Unfortunately, we are called from iget() when we don't have a dentry
215 if (list_empty(&ino
->i_dentry
))
219 name
= inode_name(ino
, 0);
223 if (file_type(name
, NULL
, NULL
) == OS_TYPE_SYMLINK
) {
224 name
= follow_link(name
);
231 err
= read_name(ino
, name
);
237 static struct inode
*hostfs_iget(struct super_block
*sb
)
242 inode
= iget_locked(sb
, 0);
244 return ERR_PTR(-ENOMEM
);
245 if (inode
->i_state
& I_NEW
) {
246 ret
= hostfs_read_inode(inode
);
251 unlock_new_inode(inode
);
256 int hostfs_statfs(struct dentry
*dentry
, struct kstatfs
*sf
)
259 * do_statfs uses struct statfs64 internally, but the linux kernel
260 * struct statfs still has 32-bit versions for most of these fields,
261 * so we convert them here
270 err
= do_statfs(HOSTFS_I(dentry
->d_sb
->s_root
->d_inode
)->host_filename
,
271 &sf
->f_bsize
, &f_blocks
, &f_bfree
, &f_bavail
, &f_files
,
272 &f_ffree
, &sf
->f_fsid
, sizeof(sf
->f_fsid
),
273 &sf
->f_namelen
, sf
->f_spare
);
276 sf
->f_blocks
= f_blocks
;
277 sf
->f_bfree
= f_bfree
;
278 sf
->f_bavail
= f_bavail
;
279 sf
->f_files
= f_files
;
280 sf
->f_ffree
= f_ffree
;
281 sf
->f_type
= HOSTFS_SUPER_MAGIC
;
285 static struct inode
*hostfs_alloc_inode(struct super_block
*sb
)
287 struct hostfs_inode_info
*hi
;
289 hi
= kmalloc(sizeof(*hi
), GFP_KERNEL
);
293 *hi
= ((struct hostfs_inode_info
) { .host_filename
= NULL
,
296 inode_init_once(&hi
->vfs_inode
);
297 return &hi
->vfs_inode
;
300 static void hostfs_delete_inode(struct inode
*inode
)
302 truncate_inode_pages(&inode
->i_data
, 0);
303 if (HOSTFS_I(inode
)->fd
!= -1) {
304 close_file(&HOSTFS_I(inode
)->fd
);
305 HOSTFS_I(inode
)->fd
= -1;
310 static void hostfs_destroy_inode(struct inode
*inode
)
312 kfree(HOSTFS_I(inode
)->host_filename
);
315 * XXX: This should not happen, probably. The check is here for
318 if (HOSTFS_I(inode
)->fd
!= -1) {
319 close_file(&HOSTFS_I(inode
)->fd
);
320 printk(KERN_DEBUG
"Closing host fd in .destroy_inode\n");
323 kfree(HOSTFS_I(inode
));
326 static int hostfs_show_options(struct seq_file
*seq
, struct vfsmount
*vfs
)
328 struct inode
*root
= vfs
->mnt_sb
->s_root
->d_inode
;
329 const char *root_path
= HOSTFS_I(root
)->host_filename
;
330 size_t offset
= strlen(root_ino
) + 1;
332 if (strlen(root_path
) > offset
)
333 seq_printf(seq
, ",%s", root_path
+ offset
);
338 static const struct super_operations hostfs_sbops
= {
339 .alloc_inode
= hostfs_alloc_inode
,
340 .drop_inode
= generic_delete_inode
,
341 .delete_inode
= hostfs_delete_inode
,
342 .destroy_inode
= hostfs_destroy_inode
,
343 .statfs
= hostfs_statfs
,
344 .show_options
= hostfs_show_options
,
347 int hostfs_readdir(struct file
*file
, void *ent
, filldir_t filldir
)
351 unsigned long long next
, ino
;
354 name
= dentry_name(file
->f_path
.dentry
, 0);
357 dir
= open_dir(name
, &error
);
362 while ((name
= read_dir(dir
, &next
, &ino
, &len
)) != NULL
) {
363 error
= (*filldir
)(ent
, name
, len
, file
->f_pos
,
372 int hostfs_file_open(struct inode
*ino
, struct file
*file
)
375 int mode
= 0, r
= 0, w
= 0, fd
;
377 mode
= file
->f_mode
& (FMODE_READ
| FMODE_WRITE
);
378 if ((mode
& HOSTFS_I(ino
)->mode
) == mode
)
382 * The file may already have been opened, but with the wrong access,
383 * so this resets things and reopens the file with the new access.
385 if (HOSTFS_I(ino
)->fd
!= -1) {
386 close_file(&HOSTFS_I(ino
)->fd
);
387 HOSTFS_I(ino
)->fd
= -1;
390 HOSTFS_I(ino
)->mode
|= mode
;
391 if (HOSTFS_I(ino
)->mode
& FMODE_READ
)
393 if (HOSTFS_I(ino
)->mode
& FMODE_WRITE
)
398 name
= dentry_name(file
->f_path
.dentry
, 0);
402 fd
= open_file(name
, r
, w
, append
);
406 FILE_HOSTFS_I(file
)->fd
= fd
;
411 int hostfs_fsync(struct file
*file
, struct dentry
*dentry
, int datasync
)
413 return fsync_file(HOSTFS_I(dentry
->d_inode
)->fd
, datasync
);
416 static const struct file_operations hostfs_file_fops
= {
417 .llseek
= generic_file_llseek
,
418 .read
= do_sync_read
,
419 .splice_read
= generic_file_splice_read
,
420 .aio_read
= generic_file_aio_read
,
421 .aio_write
= generic_file_aio_write
,
422 .write
= do_sync_write
,
423 .mmap
= generic_file_mmap
,
424 .open
= hostfs_file_open
,
426 .fsync
= hostfs_fsync
,
429 static const struct file_operations hostfs_dir_fops
= {
430 .llseek
= generic_file_llseek
,
431 .readdir
= hostfs_readdir
,
432 .read
= generic_read_dir
,
435 int hostfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
437 struct address_space
*mapping
= page
->mapping
;
438 struct inode
*inode
= mapping
->host
;
440 unsigned long long base
;
441 int count
= PAGE_CACHE_SIZE
;
442 int end_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
445 if (page
->index
>= end_index
)
446 count
= inode
->i_size
& (PAGE_CACHE_SIZE
-1);
449 base
= ((unsigned long long) page
->index
) << PAGE_CACHE_SHIFT
;
451 err
= write_file(HOSTFS_I(inode
)->fd
, &base
, buffer
, count
);
453 ClearPageUptodate(page
);
457 if (base
> inode
->i_size
)
458 inode
->i_size
= base
;
461 ClearPageError(page
);
471 int hostfs_readpage(struct file
*file
, struct page
*page
)
477 start
= (long long) page
->index
<< PAGE_CACHE_SHIFT
;
479 err
= read_file(FILE_HOSTFS_I(file
)->fd
, &start
, buffer
,
484 memset(&buffer
[err
], 0, PAGE_CACHE_SIZE
- err
);
486 flush_dcache_page(page
);
487 SetPageUptodate(page
);
488 if (PageError(page
)) ClearPageError(page
);
496 int hostfs_write_begin(struct file
*file
, struct address_space
*mapping
,
497 loff_t pos
, unsigned len
, unsigned flags
,
498 struct page
**pagep
, void **fsdata
)
500 pgoff_t index
= pos
>> PAGE_CACHE_SHIFT
;
502 *pagep
= __grab_cache_page(mapping
, index
);
508 int hostfs_write_end(struct file
*file
, struct address_space
*mapping
,
509 loff_t pos
, unsigned len
, unsigned copied
,
510 struct page
*page
, void *fsdata
)
512 struct inode
*inode
= mapping
->host
;
514 unsigned from
= pos
& (PAGE_CACHE_SIZE
- 1);
518 err
= write_file(FILE_HOSTFS_I(file
)->fd
, &pos
, buffer
+ from
, copied
);
521 if (!PageUptodate(page
) && err
== PAGE_CACHE_SIZE
)
522 SetPageUptodate(page
);
525 * If err > 0, write_file has added err to pos, so we are comparing
526 * i_size against the last byte written.
528 if (err
> 0 && (pos
> inode
->i_size
))
531 page_cache_release(page
);
536 static const struct address_space_operations hostfs_aops
= {
537 .writepage
= hostfs_writepage
,
538 .readpage
= hostfs_readpage
,
539 .set_page_dirty
= __set_page_dirty_nobuffers
,
540 .write_begin
= hostfs_write_begin
,
541 .write_end
= hostfs_write_end
,
544 static int init_inode(struct inode
*inode
, struct dentry
*dentry
)
547 int type
, err
= -ENOMEM
;
552 name
= dentry_name(dentry
, 0);
555 type
= file_type(name
, &maj
, &min
);
556 /* Reencode maj and min with the kernel encoding.*/
557 rdev
= MKDEV(maj
, min
);
560 else type
= OS_TYPE_DIR
;
563 if (type
== OS_TYPE_SYMLINK
)
564 inode
->i_op
= &page_symlink_inode_operations
;
565 else if (type
== OS_TYPE_DIR
)
566 inode
->i_op
= &hostfs_dir_iops
;
567 else inode
->i_op
= &hostfs_iops
;
569 if (type
== OS_TYPE_DIR
) inode
->i_fop
= &hostfs_dir_fops
;
570 else inode
->i_fop
= &hostfs_file_fops
;
572 if (type
== OS_TYPE_SYMLINK
)
573 inode
->i_mapping
->a_ops
= &hostfs_link_aops
;
574 else inode
->i_mapping
->a_ops
= &hostfs_aops
;
577 case OS_TYPE_CHARDEV
:
578 init_special_inode(inode
, S_IFCHR
, rdev
);
580 case OS_TYPE_BLOCKDEV
:
581 init_special_inode(inode
, S_IFBLK
, rdev
);
584 init_special_inode(inode
, S_IFIFO
, 0);
587 init_special_inode(inode
, S_IFSOCK
, 0);
594 int hostfs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
595 struct nameidata
*nd
)
601 inode
= hostfs_iget(dir
->i_sb
);
603 error
= PTR_ERR(inode
);
607 error
= init_inode(inode
, dentry
);
612 name
= dentry_name(dentry
, 0);
616 fd
= file_create(name
,
617 mode
& S_IRUSR
, mode
& S_IWUSR
, mode
& S_IXUSR
,
618 mode
& S_IRGRP
, mode
& S_IWGRP
, mode
& S_IXGRP
,
619 mode
& S_IROTH
, mode
& S_IWOTH
, mode
& S_IXOTH
);
622 else error
= read_name(inode
, name
);
628 HOSTFS_I(inode
)->fd
= fd
;
629 HOSTFS_I(inode
)->mode
= FMODE_READ
| FMODE_WRITE
;
630 d_instantiate(dentry
, inode
);
639 struct dentry
*hostfs_lookup(struct inode
*ino
, struct dentry
*dentry
,
640 struct nameidata
*nd
)
646 inode
= hostfs_iget(ino
->i_sb
);
648 err
= PTR_ERR(inode
);
652 err
= init_inode(inode
, dentry
);
657 name
= dentry_name(dentry
, 0);
661 err
= read_name(inode
, name
);
663 if (err
== -ENOENT
) {
670 d_add(dentry
, inode
);
671 dentry
->d_op
= &hostfs_dentry_ops
;
680 static char *inode_dentry_name(struct inode
*ino
, struct dentry
*dentry
)
685 file
= inode_name(ino
, dentry
->d_name
.len
+ 1);
690 strncat(file
, dentry
->d_name
.name
, dentry
->d_name
.len
);
691 file
[len
+ dentry
->d_name
.len
] = '\0';
695 int hostfs_link(struct dentry
*to
, struct inode
*ino
, struct dentry
*from
)
697 char *from_name
, *to_name
;
700 if ((from_name
= inode_dentry_name(ino
, from
)) == NULL
)
702 to_name
= dentry_name(to
, 0);
703 if (to_name
== NULL
) {
707 err
= link_file(to_name
, from_name
);
713 int hostfs_unlink(struct inode
*ino
, struct dentry
*dentry
)
718 if ((file
= inode_dentry_name(ino
, dentry
)) == NULL
)
723 err
= unlink_file(file
);
728 int hostfs_symlink(struct inode
*ino
, struct dentry
*dentry
, const char *to
)
733 if ((file
= inode_dentry_name(ino
, dentry
)) == NULL
)
735 err
= make_symlink(file
, to
);
740 int hostfs_mkdir(struct inode
*ino
, struct dentry
*dentry
, int mode
)
745 if ((file
= inode_dentry_name(ino
, dentry
)) == NULL
)
747 err
= do_mkdir(file
, mode
);
752 int hostfs_rmdir(struct inode
*ino
, struct dentry
*dentry
)
757 if ((file
= inode_dentry_name(ino
, dentry
)) == NULL
)
759 err
= do_rmdir(file
);
764 int hostfs_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t dev
)
770 inode
= hostfs_iget(dir
->i_sb
);
772 err
= PTR_ERR(inode
);
776 err
= init_inode(inode
, dentry
);
781 name
= dentry_name(dentry
, 0);
785 init_special_inode(inode
, mode
, dev
);
786 err
= do_mknod(name
, mode
, MAJOR(dev
), MINOR(dev
));
790 err
= read_name(inode
, name
);
795 d_instantiate(dentry
, inode
);
806 int hostfs_rename(struct inode
*from_ino
, struct dentry
*from
,
807 struct inode
*to_ino
, struct dentry
*to
)
809 char *from_name
, *to_name
;
812 if ((from_name
= inode_dentry_name(from_ino
, from
)) == NULL
)
814 if ((to_name
= inode_dentry_name(to_ino
, to
)) == NULL
) {
818 err
= rename_file(from_name
, to_name
);
824 int hostfs_permission(struct inode
*ino
, int desired
, struct nameidata
*nd
)
827 int r
= 0, w
= 0, x
= 0, err
;
829 if (desired
& MAY_READ
) r
= 1;
830 if (desired
& MAY_WRITE
) w
= 1;
831 if (desired
& MAY_EXEC
) x
= 1;
832 name
= inode_name(ino
, 0);
836 if (S_ISCHR(ino
->i_mode
) || S_ISBLK(ino
->i_mode
) ||
837 S_ISFIFO(ino
->i_mode
) || S_ISSOCK(ino
->i_mode
))
840 err
= access_file(name
, r
, w
, x
);
843 err
= generic_permission(ino
, desired
, NULL
);
847 int hostfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
849 struct hostfs_iattr attrs
;
853 int fd
= HOSTFS_I(dentry
->d_inode
)->fd
;
855 err
= inode_change_ok(dentry
->d_inode
, attr
);
860 attr
->ia_valid
&= ~ATTR_SIZE
;
863 if (attr
->ia_valid
& ATTR_MODE
) {
864 attrs
.ia_valid
|= HOSTFS_ATTR_MODE
;
865 attrs
.ia_mode
= attr
->ia_mode
;
867 if (attr
->ia_valid
& ATTR_UID
) {
868 attrs
.ia_valid
|= HOSTFS_ATTR_UID
;
869 attrs
.ia_uid
= attr
->ia_uid
;
871 if (attr
->ia_valid
& ATTR_GID
) {
872 attrs
.ia_valid
|= HOSTFS_ATTR_GID
;
873 attrs
.ia_gid
= attr
->ia_gid
;
875 if (attr
->ia_valid
& ATTR_SIZE
) {
876 attrs
.ia_valid
|= HOSTFS_ATTR_SIZE
;
877 attrs
.ia_size
= attr
->ia_size
;
879 if (attr
->ia_valid
& ATTR_ATIME
) {
880 attrs
.ia_valid
|= HOSTFS_ATTR_ATIME
;
881 attrs
.ia_atime
= attr
->ia_atime
;
883 if (attr
->ia_valid
& ATTR_MTIME
) {
884 attrs
.ia_valid
|= HOSTFS_ATTR_MTIME
;
885 attrs
.ia_mtime
= attr
->ia_mtime
;
887 if (attr
->ia_valid
& ATTR_CTIME
) {
888 attrs
.ia_valid
|= HOSTFS_ATTR_CTIME
;
889 attrs
.ia_ctime
= attr
->ia_ctime
;
891 if (attr
->ia_valid
& ATTR_ATIME_SET
) {
892 attrs
.ia_valid
|= HOSTFS_ATTR_ATIME_SET
;
894 if (attr
->ia_valid
& ATTR_MTIME_SET
) {
895 attrs
.ia_valid
|= HOSTFS_ATTR_MTIME_SET
;
897 name
= dentry_name(dentry
, 0);
900 err
= set_attr(name
, &attrs
, fd
);
905 return inode_setattr(dentry
->d_inode
, attr
);
908 static const struct inode_operations hostfs_iops
= {
909 .create
= hostfs_create
,
911 .unlink
= hostfs_unlink
,
912 .symlink
= hostfs_symlink
,
913 .mkdir
= hostfs_mkdir
,
914 .rmdir
= hostfs_rmdir
,
915 .mknod
= hostfs_mknod
,
916 .rename
= hostfs_rename
,
917 .permission
= hostfs_permission
,
918 .setattr
= hostfs_setattr
,
921 static const struct inode_operations hostfs_dir_iops
= {
922 .create
= hostfs_create
,
923 .lookup
= hostfs_lookup
,
925 .unlink
= hostfs_unlink
,
926 .symlink
= hostfs_symlink
,
927 .mkdir
= hostfs_mkdir
,
928 .rmdir
= hostfs_rmdir
,
929 .mknod
= hostfs_mknod
,
930 .rename
= hostfs_rename
,
931 .permission
= hostfs_permission
,
932 .setattr
= hostfs_setattr
,
935 int hostfs_link_readpage(struct file
*file
, struct page
*page
)
941 name
= inode_name(page
->mapping
->host
, 0);
944 err
= do_readlink(name
, buffer
, PAGE_CACHE_SIZE
);
946 if (err
== PAGE_CACHE_SIZE
)
949 flush_dcache_page(page
);
950 SetPageUptodate(page
);
951 if (PageError(page
)) ClearPageError(page
);
959 static const struct address_space_operations hostfs_link_aops
= {
960 .readpage
= hostfs_link_readpage
,
963 static int hostfs_fill_sb_common(struct super_block
*sb
, void *d
, int silent
)
965 struct inode
*root_inode
;
966 char *host_root_path
, *req_root
= d
;
969 sb
->s_blocksize
= 1024;
970 sb
->s_blocksize_bits
= 10;
971 sb
->s_magic
= HOSTFS_SUPER_MAGIC
;
972 sb
->s_op
= &hostfs_sbops
;
974 /* NULL is printed as <NULL> by sprintf: avoid that. */
975 if (req_root
== NULL
)
979 host_root_path
= kmalloc(strlen(root_ino
) + 1
980 + strlen(req_root
) + 1, GFP_KERNEL
);
981 if (host_root_path
== NULL
)
984 sprintf(host_root_path
, "%s/%s", root_ino
, req_root
);
986 root_inode
= hostfs_iget(sb
);
987 if (IS_ERR(root_inode
)) {
988 err
= PTR_ERR(root_inode
);
992 err
= init_inode(root_inode
, NULL
);
996 HOSTFS_I(root_inode
)->host_filename
= host_root_path
;
998 * Avoid that in the error path, iput(root_inode) frees again
999 * host_root_path through hostfs_destroy_inode!
1001 host_root_path
= NULL
;
1004 sb
->s_root
= d_alloc_root(root_inode
);
1005 if (sb
->s_root
== NULL
)
1008 err
= hostfs_read_inode(root_inode
);
1010 /* No iput in this case because the dput does that for us */
1021 kfree(host_root_path
);
1026 static int hostfs_read_sb(struct file_system_type
*type
,
1027 int flags
, const char *dev_name
,
1028 void *data
, struct vfsmount
*mnt
)
1030 return get_sb_nodev(type
, flags
, data
, hostfs_fill_sb_common
, mnt
);
1033 static struct file_system_type hostfs_type
= {
1034 .owner
= THIS_MODULE
,
1036 .get_sb
= hostfs_read_sb
,
1037 .kill_sb
= kill_anon_super
,
1041 static int __init
init_hostfs(void)
1043 return register_filesystem(&hostfs_type
);
1046 static void __exit
exit_hostfs(void)
1048 unregister_filesystem(&hostfs_type
);
1051 module_init(init_hostfs
)
1052 module_exit(exit_hostfs
)
1053 MODULE_LICENSE("GPL");