5 * Symlink handling routines for the OSTA-UDF(tm) filesystem.
8 * E-mail regarding any portion of the Linux UDF file system should be
9 * directed to the development team mailing list (run by majordomo):
10 * linux_udf@hootie.lvld.hp.com
13 * This file is distributed under the terms of the GNU General Public
14 * License (GPL). Copies of the GPL can be obtained from:
15 * ftp://prep.ai.mit.edu/pub/gnu/GPL
16 * Each contributing author retains all rights to their own work.
18 * (C) 1998-2000 Ben Fennema
19 * (C) 1999 Stelias Computing Inc
23 * 04/16/99 blf Created.
28 #include <asm/uaccess.h>
29 #include <linux/errno.h>
31 #include <linux/udf_fs.h>
32 #include <linux/sched.h>
34 #include <linux/stat.h>
35 #include <linux/malloc.h>
36 #include <linux/pagemap.h>
37 #include <linux/smp_lock.h>
40 static void udf_pc_to_char(char *from
, int fromlen
, char *to
)
42 struct PathComponent
*pc
;
46 while (elen
< fromlen
)
48 pc
= (struct PathComponent
*)(from
+ elen
);
49 switch (pc
->componentType
)
52 if (pc
->lengthComponentIdent
== 0)
65 /* that would be . - just ignore */
68 memcpy(p
, pc
->componentIdent
, pc
->lengthComponentIdent
);
69 p
+= pc
->lengthComponentIdent
;
72 elen
+= sizeof(struct PathComponent
) + pc
->lengthComponentIdent
;
80 static int udf_symlink_filler(struct file
*file
, struct page
*page
)
82 struct inode
*inode
= (struct inode
*)page
->mapping
->host
;
83 struct buffer_head
*bh
= NULL
;
86 char *p
= (char *)kmap(page
);
89 if (UDF_I_ALLOCTYPE(inode
) == ICB_FLAG_AD_IN_ICB
)
91 bh
= udf_tread(inode
->i_sb
, inode
->i_ino
, inode
->i_sb
->s_blocksize
);
96 symlink
= bh
->b_data
+ udf_file_entry_alloc_offset(inode
);
100 bh
= bread(inode
->i_dev
, udf_block_map(inode
, 0),
101 inode
->i_sb
->s_blocksize
);
106 symlink
= bh
->b_data
;
109 udf_pc_to_char(symlink
, inode
->i_size
, p
);
110 udf_release_data(bh
);
113 SetPageUptodate(page
);
126 * symlinks can't do much...
128 struct address_space_operations udf_symlink_aops
= {
129 readpage
: udf_symlink_filler
,