2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
5 * Ported the filesystem routines to 2.5.
6 * 2003-02-10 Petr Baudis <pasky@ucw.cz>
9 #include <linux/stddef.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/pagemap.h>
15 #include <linux/blkdev.h>
16 #include <linux/list.h>
17 #include <linux/statfs.h>
18 #include <linux/kdev_t.h>
19 #include <asm/uaccess.h>
21 #include "kern_util.h"
25 struct hostfs_inode_info
{
29 struct inode vfs_inode
;
32 static inline struct hostfs_inode_info
*HOSTFS_I(struct inode
*inode
)
34 return(list_entry(inode
, struct hostfs_inode_info
, vfs_inode
));
37 #define FILE_HOSTFS_I(file) HOSTFS_I((file)->f_path.dentry->d_inode)
39 int hostfs_d_delete(struct dentry
*dentry
)
44 struct dentry_operations hostfs_dentry_ops
= {
45 .d_delete
= hostfs_d_delete
,
48 /* Changed in hostfs_args before the kernel starts running */
49 static char *root_ino
= "";
50 static int append
= 0;
52 #define HOSTFS_SUPER_MAGIC 0x00c0ffee
54 static const struct inode_operations hostfs_iops
;
55 static const struct inode_operations hostfs_dir_iops
;
56 static const struct address_space_operations hostfs_link_aops
;
59 static int __init
hostfs_args(char *options
, int *add
)
63 ptr
= strchr(options
, ',');
71 ptr
= strchr(options
, ',');
75 if(!strcmp(options
, "append"))
77 else printf("hostfs_args - unsupported option - %s\n",
85 __uml_setup("hostfs=", hostfs_args
,
86 "hostfs=<root dir>,<flags>,...\n"
87 " This is used to set hostfs parameters. The root directory argument\n"
88 " is used to confine all hostfs mounts to within the specified directory\n"
89 " tree on the host. If this isn't specified, then a user inside UML can\n"
90 " mount anything on the host that's accessible to the user that's running\n"
92 " The only flag currently supported is 'append', which specifies that all\n"
93 " files opened by hostfs will be opened in append mode.\n\n"
97 static char *dentry_name(struct dentry
*dentry
, int extra
)
99 struct dentry
*parent
;
105 while(parent
->d_parent
!= parent
){
106 len
+= parent
->d_name
.len
+ 1;
107 parent
= parent
->d_parent
;
110 root
= HOSTFS_I(parent
->d_inode
)->host_filename
;
112 name
= kmalloc(len
+ extra
+ 1, GFP_KERNEL
);
113 if(name
== NULL
) return(NULL
);
117 while(parent
->d_parent
!= parent
){
118 len
-= parent
->d_name
.len
+ 1;
120 strncpy(&name
[len
+ 1], parent
->d_name
.name
,
122 parent
= parent
->d_parent
;
124 strncpy(name
, root
, strlen(root
));
128 static char *inode_name(struct inode
*ino
, int extra
)
130 struct dentry
*dentry
;
132 dentry
= list_entry(ino
->i_dentry
.next
, struct dentry
, d_alias
);
133 return(dentry_name(dentry
, extra
));
136 static int read_name(struct inode
*ino
, char *name
)
138 /* The non-int inode fields are copied into ints by stat_file and
139 * then copied into the inode because passing the actual pointers
140 * in and having them treated as int * breaks on big-endian machines
143 int i_mode
, i_nlink
, i_blksize
;
144 unsigned long long i_size
;
145 unsigned long long i_ino
;
146 unsigned long long i_blocks
;
148 err
= stat_file(name
, &i_ino
, &i_mode
, &i_nlink
, &ino
->i_uid
,
149 &ino
->i_gid
, &i_size
, &ino
->i_atime
, &ino
->i_mtime
,
150 &ino
->i_ctime
, &i_blksize
, &i_blocks
);
155 ino
->i_mode
= i_mode
;
156 ino
->i_nlink
= i_nlink
;
157 ino
->i_size
= i_size
;
158 ino
->i_blocks
= i_blocks
;
162 static char *follow_link(char *link
)
165 char *name
, *resolved
, *end
;
170 name
= kmalloc(len
, GFP_KERNEL
);
174 n
= do_readlink(link
, name
, len
);
186 end
= strrchr(link
, '/');
191 len
= strlen(link
) + strlen(name
) + 1;
193 resolved
= kmalloc(len
, GFP_KERNEL
);
194 if(resolved
== NULL
){
199 sprintf(resolved
, "%s%s", link
, name
);
210 static int read_inode(struct inode
*ino
)
215 /* Unfortunately, we are called from iget() when we don't have a dentry
218 if(list_empty(&ino
->i_dentry
))
222 name
= inode_name(ino
, 0);
226 if(file_type(name
, NULL
, NULL
) == OS_TYPE_SYMLINK
){
227 name
= follow_link(name
);
234 err
= read_name(ino
, name
);
240 int hostfs_statfs(struct dentry
*dentry
, struct kstatfs
*sf
)
242 /* do_statfs uses struct statfs64 internally, but the linux kernel
243 * struct statfs still has 32-bit versions for most of these fields,
244 * so we convert them here
253 err
= do_statfs(HOSTFS_I(dentry
->d_sb
->s_root
->d_inode
)->host_filename
,
254 &sf
->f_bsize
, &f_blocks
, &f_bfree
, &f_bavail
, &f_files
,
255 &f_ffree
, &sf
->f_fsid
, sizeof(sf
->f_fsid
),
256 &sf
->f_namelen
, sf
->f_spare
);
258 sf
->f_blocks
= f_blocks
;
259 sf
->f_bfree
= f_bfree
;
260 sf
->f_bavail
= f_bavail
;
261 sf
->f_files
= f_files
;
262 sf
->f_ffree
= f_ffree
;
263 sf
->f_type
= HOSTFS_SUPER_MAGIC
;
267 static struct inode
*hostfs_alloc_inode(struct super_block
*sb
)
269 struct hostfs_inode_info
*hi
;
271 hi
= kmalloc(sizeof(*hi
), GFP_KERNEL
);
275 *hi
= ((struct hostfs_inode_info
) { .host_filename
= NULL
,
278 inode_init_once(&hi
->vfs_inode
);
279 return(&hi
->vfs_inode
);
282 static void hostfs_delete_inode(struct inode
*inode
)
284 truncate_inode_pages(&inode
->i_data
, 0);
285 if(HOSTFS_I(inode
)->fd
!= -1) {
286 close_file(&HOSTFS_I(inode
)->fd
);
287 HOSTFS_I(inode
)->fd
= -1;
292 static void hostfs_destroy_inode(struct inode
*inode
)
294 kfree(HOSTFS_I(inode
)->host_filename
);
296 /*XXX: This should not happen, probably. The check is here for
297 * additional safety.*/
298 if(HOSTFS_I(inode
)->fd
!= -1) {
299 close_file(&HOSTFS_I(inode
)->fd
);
300 printk(KERN_DEBUG
"Closing host fd in .destroy_inode\n");
303 kfree(HOSTFS_I(inode
));
306 static void hostfs_read_inode(struct inode
*inode
)
311 static const struct super_operations hostfs_sbops
= {
312 .alloc_inode
= hostfs_alloc_inode
,
313 .drop_inode
= generic_delete_inode
,
314 .delete_inode
= hostfs_delete_inode
,
315 .destroy_inode
= hostfs_destroy_inode
,
316 .read_inode
= hostfs_read_inode
,
317 .statfs
= hostfs_statfs
,
320 int hostfs_readdir(struct file
*file
, void *ent
, filldir_t filldir
)
324 unsigned long long next
, ino
;
327 name
= dentry_name(file
->f_path
.dentry
, 0);
328 if(name
== NULL
) return(-ENOMEM
);
329 dir
= open_dir(name
, &error
);
331 if(dir
== NULL
) return(-error
);
333 while((name
= read_dir(dir
, &next
, &ino
, &len
)) != NULL
){
334 error
= (*filldir
)(ent
, name
, len
, file
->f_pos
,
343 int hostfs_file_open(struct inode
*ino
, struct file
*file
)
346 int mode
= 0, r
= 0, w
= 0, fd
;
348 mode
= file
->f_mode
& (FMODE_READ
| FMODE_WRITE
);
349 if((mode
& HOSTFS_I(ino
)->mode
) == mode
)
352 /* The file may already have been opened, but with the wrong access,
353 * so this resets things and reopens the file with the new access.
355 if(HOSTFS_I(ino
)->fd
!= -1){
356 close_file(&HOSTFS_I(ino
)->fd
);
357 HOSTFS_I(ino
)->fd
= -1;
360 HOSTFS_I(ino
)->mode
|= mode
;
361 if(HOSTFS_I(ino
)->mode
& FMODE_READ
)
363 if(HOSTFS_I(ino
)->mode
& FMODE_WRITE
)
368 name
= dentry_name(file
->f_path
.dentry
, 0);
372 fd
= open_file(name
, r
, w
, append
);
374 if(fd
< 0) return(fd
);
375 FILE_HOSTFS_I(file
)->fd
= fd
;
380 int hostfs_fsync(struct file
*file
, struct dentry
*dentry
, int datasync
)
382 return fsync_file(HOSTFS_I(dentry
->d_inode
)->fd
, datasync
);
385 static const struct file_operations hostfs_file_fops
= {
386 .llseek
= generic_file_llseek
,
387 .read
= do_sync_read
,
388 .sendfile
= generic_file_sendfile
,
389 .aio_read
= generic_file_aio_read
,
390 .aio_write
= generic_file_aio_write
,
391 .write
= do_sync_write
,
392 .mmap
= generic_file_mmap
,
393 .open
= hostfs_file_open
,
395 .fsync
= hostfs_fsync
,
398 static const struct file_operations hostfs_dir_fops
= {
399 .llseek
= generic_file_llseek
,
400 .readdir
= hostfs_readdir
,
401 .read
= generic_read_dir
,
404 int hostfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
406 struct address_space
*mapping
= page
->mapping
;
407 struct inode
*inode
= mapping
->host
;
409 unsigned long long base
;
410 int count
= PAGE_CACHE_SIZE
;
411 int end_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
414 if (page
->index
>= end_index
)
415 count
= inode
->i_size
& (PAGE_CACHE_SIZE
-1);
418 base
= ((unsigned long long) page
->index
) << PAGE_CACHE_SHIFT
;
420 err
= write_file(HOSTFS_I(inode
)->fd
, &base
, buffer
, count
);
422 ClearPageUptodate(page
);
426 if (base
> inode
->i_size
)
427 inode
->i_size
= base
;
430 ClearPageError(page
);
440 int hostfs_readpage(struct file
*file
, struct page
*page
)
446 start
= (long long) page
->index
<< PAGE_CACHE_SHIFT
;
448 err
= read_file(FILE_HOSTFS_I(file
)->fd
, &start
, buffer
,
450 if(err
< 0) goto out
;
452 memset(&buffer
[err
], 0, PAGE_CACHE_SIZE
- err
);
454 flush_dcache_page(page
);
455 SetPageUptodate(page
);
456 if (PageError(page
)) ClearPageError(page
);
464 int hostfs_prepare_write(struct file
*file
, struct page
*page
,
465 unsigned int from
, unsigned int to
)
468 long long start
, tmp
;
471 start
= (long long) page
->index
<< PAGE_CACHE_SHIFT
;
475 err
= read_file(FILE_HOSTFS_I(file
)->fd
, &tmp
, buffer
,
477 if(err
< 0) goto out
;
479 if(to
!= PAGE_CACHE_SIZE
){
481 err
= read_file(FILE_HOSTFS_I(file
)->fd
, &start
, buffer
+ to
,
482 PAGE_CACHE_SIZE
- to
);
483 if(err
< 0) goto out
;
491 int hostfs_commit_write(struct file
*file
, struct page
*page
, unsigned from
,
494 struct address_space
*mapping
= page
->mapping
;
495 struct inode
*inode
= mapping
->host
;
500 start
= (((long long) page
->index
) << PAGE_CACHE_SHIFT
) + from
;
502 err
= write_file(FILE_HOSTFS_I(file
)->fd
, &start
, buffer
+ from
,
506 /* Actually, if !err, write_file has added to-from to start, so, despite
507 * the appearance, we are comparing i_size against the _last_ written
508 * location, as we should. */
510 if(!err
&& (start
> inode
->i_size
))
511 inode
->i_size
= start
;
517 static const struct address_space_operations hostfs_aops
= {
518 .writepage
= hostfs_writepage
,
519 .readpage
= hostfs_readpage
,
520 .set_page_dirty
= __set_page_dirty_nobuffers
,
521 .prepare_write
= hostfs_prepare_write
,
522 .commit_write
= hostfs_commit_write
525 static int init_inode(struct inode
*inode
, struct dentry
*dentry
)
528 int type
, err
= -ENOMEM
;
533 name
= dentry_name(dentry
, 0);
536 type
= file_type(name
, &maj
, &min
);
537 /*Reencode maj and min with the kernel encoding.*/
538 rdev
= MKDEV(maj
, min
);
541 else type
= OS_TYPE_DIR
;
544 if(type
== OS_TYPE_SYMLINK
)
545 inode
->i_op
= &page_symlink_inode_operations
;
546 else if(type
== OS_TYPE_DIR
)
547 inode
->i_op
= &hostfs_dir_iops
;
548 else inode
->i_op
= &hostfs_iops
;
550 if(type
== OS_TYPE_DIR
) inode
->i_fop
= &hostfs_dir_fops
;
551 else inode
->i_fop
= &hostfs_file_fops
;
553 if(type
== OS_TYPE_SYMLINK
)
554 inode
->i_mapping
->a_ops
= &hostfs_link_aops
;
555 else inode
->i_mapping
->a_ops
= &hostfs_aops
;
558 case OS_TYPE_CHARDEV
:
559 init_special_inode(inode
, S_IFCHR
, rdev
);
561 case OS_TYPE_BLOCKDEV
:
562 init_special_inode(inode
, S_IFBLK
, rdev
);
565 init_special_inode(inode
, S_IFIFO
, 0);
568 init_special_inode(inode
, S_IFSOCK
, 0);
575 int hostfs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
576 struct nameidata
*nd
)
583 inode
= iget(dir
->i_sb
, 0);
584 if(inode
== NULL
) goto out
;
586 error
= init_inode(inode
, dentry
);
591 name
= dentry_name(dentry
, 0);
595 fd
= file_create(name
,
596 mode
& S_IRUSR
, mode
& S_IWUSR
, mode
& S_IXUSR
,
597 mode
& S_IRGRP
, mode
& S_IWGRP
, mode
& S_IXGRP
,
598 mode
& S_IROTH
, mode
& S_IWOTH
, mode
& S_IXOTH
);
601 else error
= read_name(inode
, name
);
607 HOSTFS_I(inode
)->fd
= fd
;
608 HOSTFS_I(inode
)->mode
= FMODE_READ
| FMODE_WRITE
;
609 d_instantiate(dentry
, inode
);
618 struct dentry
*hostfs_lookup(struct inode
*ino
, struct dentry
*dentry
,
619 struct nameidata
*nd
)
626 inode
= iget(ino
->i_sb
, 0);
630 err
= init_inode(inode
, dentry
);
635 name
= dentry_name(dentry
, 0);
639 err
= read_name(inode
, name
);
648 d_add(dentry
, inode
);
649 dentry
->d_op
= &hostfs_dentry_ops
;
655 return(ERR_PTR(err
));
658 static char *inode_dentry_name(struct inode
*ino
, struct dentry
*dentry
)
663 file
= inode_name(ino
, dentry
->d_name
.len
+ 1);
664 if(file
== NULL
) return(NULL
);
667 strncat(file
, dentry
->d_name
.name
, dentry
->d_name
.len
);
668 file
[len
+ dentry
->d_name
.len
] = '\0';
672 int hostfs_link(struct dentry
*to
, struct inode
*ino
, struct dentry
*from
)
674 char *from_name
, *to_name
;
677 if((from_name
= inode_dentry_name(ino
, from
)) == NULL
)
679 to_name
= dentry_name(to
, 0);
684 err
= link_file(to_name
, from_name
);
690 int hostfs_unlink(struct inode
*ino
, struct dentry
*dentry
)
695 if((file
= inode_dentry_name(ino
, dentry
)) == NULL
) return(-ENOMEM
);
699 err
= unlink_file(file
);
704 int hostfs_symlink(struct inode
*ino
, struct dentry
*dentry
, const char *to
)
709 if((file
= inode_dentry_name(ino
, dentry
)) == NULL
) return(-ENOMEM
);
710 err
= make_symlink(file
, to
);
715 int hostfs_mkdir(struct inode
*ino
, struct dentry
*dentry
, int mode
)
720 if((file
= inode_dentry_name(ino
, dentry
)) == NULL
) return(-ENOMEM
);
721 err
= do_mkdir(file
, mode
);
726 int hostfs_rmdir(struct inode
*ino
, struct dentry
*dentry
)
731 if((file
= inode_dentry_name(ino
, dentry
)) == NULL
) return(-ENOMEM
);
732 err
= do_rmdir(file
);
737 int hostfs_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t dev
)
743 inode
= iget(dir
->i_sb
, 0);
747 err
= init_inode(inode
, dentry
);
752 name
= dentry_name(dentry
, 0);
756 init_special_inode(inode
, mode
, dev
);
757 err
= do_mknod(name
, mode
, MAJOR(dev
), MINOR(dev
));
761 err
= read_name(inode
, name
);
766 d_instantiate(dentry
, inode
);
777 int hostfs_rename(struct inode
*from_ino
, struct dentry
*from
,
778 struct inode
*to_ino
, struct dentry
*to
)
780 char *from_name
, *to_name
;
783 if((from_name
= inode_dentry_name(from_ino
, from
)) == NULL
)
785 if((to_name
= inode_dentry_name(to_ino
, to
)) == NULL
){
789 err
= rename_file(from_name
, to_name
);
795 int hostfs_permission(struct inode
*ino
, int desired
, struct nameidata
*nd
)
798 int r
= 0, w
= 0, x
= 0, err
;
800 if (desired
& MAY_READ
) r
= 1;
801 if (desired
& MAY_WRITE
) w
= 1;
802 if (desired
& MAY_EXEC
) x
= 1;
803 name
= inode_name(ino
, 0);
804 if (name
== NULL
) return(-ENOMEM
);
806 if (S_ISCHR(ino
->i_mode
) || S_ISBLK(ino
->i_mode
) ||
807 S_ISFIFO(ino
->i_mode
) || S_ISSOCK(ino
->i_mode
))
810 err
= access_file(name
, r
, w
, x
);
813 err
= generic_permission(ino
, desired
, NULL
);
817 int hostfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
819 struct hostfs_iattr attrs
;
823 err
= inode_change_ok(dentry
->d_inode
, attr
);
828 attr
->ia_valid
&= ~ATTR_SIZE
;
831 if(attr
->ia_valid
& ATTR_MODE
){
832 attrs
.ia_valid
|= HOSTFS_ATTR_MODE
;
833 attrs
.ia_mode
= attr
->ia_mode
;
835 if(attr
->ia_valid
& ATTR_UID
){
836 attrs
.ia_valid
|= HOSTFS_ATTR_UID
;
837 attrs
.ia_uid
= attr
->ia_uid
;
839 if(attr
->ia_valid
& ATTR_GID
){
840 attrs
.ia_valid
|= HOSTFS_ATTR_GID
;
841 attrs
.ia_gid
= attr
->ia_gid
;
843 if(attr
->ia_valid
& ATTR_SIZE
){
844 attrs
.ia_valid
|= HOSTFS_ATTR_SIZE
;
845 attrs
.ia_size
= attr
->ia_size
;
847 if(attr
->ia_valid
& ATTR_ATIME
){
848 attrs
.ia_valid
|= HOSTFS_ATTR_ATIME
;
849 attrs
.ia_atime
= attr
->ia_atime
;
851 if(attr
->ia_valid
& ATTR_MTIME
){
852 attrs
.ia_valid
|= HOSTFS_ATTR_MTIME
;
853 attrs
.ia_mtime
= attr
->ia_mtime
;
855 if(attr
->ia_valid
& ATTR_CTIME
){
856 attrs
.ia_valid
|= HOSTFS_ATTR_CTIME
;
857 attrs
.ia_ctime
= attr
->ia_ctime
;
859 if(attr
->ia_valid
& ATTR_ATIME_SET
){
860 attrs
.ia_valid
|= HOSTFS_ATTR_ATIME_SET
;
862 if(attr
->ia_valid
& ATTR_MTIME_SET
){
863 attrs
.ia_valid
|= HOSTFS_ATTR_MTIME_SET
;
865 name
= dentry_name(dentry
, 0);
866 if(name
== NULL
) return(-ENOMEM
);
867 err
= set_attr(name
, &attrs
);
872 return(inode_setattr(dentry
->d_inode
, attr
));
875 int hostfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
878 generic_fillattr(dentry
->d_inode
, stat
);
882 static const struct inode_operations hostfs_iops
= {
883 .create
= hostfs_create
,
885 .unlink
= hostfs_unlink
,
886 .symlink
= hostfs_symlink
,
887 .mkdir
= hostfs_mkdir
,
888 .rmdir
= hostfs_rmdir
,
889 .mknod
= hostfs_mknod
,
890 .rename
= hostfs_rename
,
891 .permission
= hostfs_permission
,
892 .setattr
= hostfs_setattr
,
893 .getattr
= hostfs_getattr
,
896 static const struct inode_operations hostfs_dir_iops
= {
897 .create
= hostfs_create
,
898 .lookup
= hostfs_lookup
,
900 .unlink
= hostfs_unlink
,
901 .symlink
= hostfs_symlink
,
902 .mkdir
= hostfs_mkdir
,
903 .rmdir
= hostfs_rmdir
,
904 .mknod
= hostfs_mknod
,
905 .rename
= hostfs_rename
,
906 .permission
= hostfs_permission
,
907 .setattr
= hostfs_setattr
,
908 .getattr
= hostfs_getattr
,
911 int hostfs_link_readpage(struct file
*file
, struct page
*page
)
917 name
= inode_name(page
->mapping
->host
, 0);
918 if(name
== NULL
) return(-ENOMEM
);
919 err
= do_readlink(name
, buffer
, PAGE_CACHE_SIZE
);
921 if(err
== PAGE_CACHE_SIZE
)
924 flush_dcache_page(page
);
925 SetPageUptodate(page
);
926 if (PageError(page
)) ClearPageError(page
);
934 static const struct address_space_operations hostfs_link_aops
= {
935 .readpage
= hostfs_link_readpage
,
938 static int hostfs_fill_sb_common(struct super_block
*sb
, void *d
, int silent
)
940 struct inode
*root_inode
;
941 char *host_root_path
, *req_root
= d
;
944 sb
->s_blocksize
= 1024;
945 sb
->s_blocksize_bits
= 10;
946 sb
->s_magic
= HOSTFS_SUPER_MAGIC
;
947 sb
->s_op
= &hostfs_sbops
;
949 /* NULL is printed as <NULL> by sprintf: avoid that. */
950 if (req_root
== NULL
)
954 host_root_path
= kmalloc(strlen(root_ino
) + 1
955 + strlen(req_root
) + 1, GFP_KERNEL
);
956 if(host_root_path
== NULL
)
959 sprintf(host_root_path
, "%s/%s", root_ino
, req_root
);
961 root_inode
= iget(sb
, 0);
962 if(root_inode
== NULL
)
965 err
= init_inode(root_inode
, NULL
);
969 HOSTFS_I(root_inode
)->host_filename
= host_root_path
;
970 /* Avoid that in the error path, iput(root_inode) frees again
971 * host_root_path through hostfs_destroy_inode! */
972 host_root_path
= NULL
;
975 sb
->s_root
= d_alloc_root(root_inode
);
976 if(sb
->s_root
== NULL
)
979 err
= read_inode(root_inode
);
981 /* No iput in this case because the dput does that for us */
992 kfree(host_root_path
);
997 static int hostfs_read_sb(struct file_system_type
*type
,
998 int flags
, const char *dev_name
,
999 void *data
, struct vfsmount
*mnt
)
1001 return get_sb_nodev(type
, flags
, data
, hostfs_fill_sb_common
, mnt
);
1004 static struct file_system_type hostfs_type
= {
1005 .owner
= THIS_MODULE
,
1007 .get_sb
= hostfs_read_sb
,
1008 .kill_sb
= kill_anon_super
,
1012 static int __init
init_hostfs(void)
1014 return(register_filesystem(&hostfs_type
));
1017 static void __exit
exit_hostfs(void)
1019 unregister_filesystem(&hostfs_type
);
1022 module_init(init_hostfs
)
1023 module_exit(exit_hostfs
)
1024 MODULE_LICENSE("GPL");
1027 * Overrides for Emacs so that we follow Linus's tabbing style.
1028 * Emacs will notice this stuff at the end of the file and automatically
1029 * adjust the settings for this buffer only. This must remain at the end
1031 * ---------------------------------------------------------------------------
1033 * c-file-style: "linux"