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David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#ifndef __DIR_DOT_H__
11#define __DIR_DOT_H__
12
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040013#include <linux/dcache.h>
Steven Whitehouseb5289682008-11-26 12:49:26 +000014#include <linux/crc32.h>
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040015
16struct inode;
17struct gfs2_inode;
18struct gfs2_inum;
19
Steven Whitehouse8d123582010-09-17 12:30:23 +010020extern struct inode *gfs2_dir_search(struct inode *dir,
21 const struct qstr *filename);
22extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
23 const struct gfs2_inode *ip);
24extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
25 const struct gfs2_inode *ip, unsigned int type);
26extern int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
27extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
28 filldir_t filldir);
29extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
30 const struct gfs2_inode *nip, unsigned int new_type);
David Teiglandb3b94fa2006-01-16 16:50:04 +000031
Steven Whitehouse8d123582010-09-17 12:30:23 +010032extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
David Teiglandb3b94fa2006-01-16 16:50:04 +000033
Steven Whitehouse8d123582010-09-17 12:30:23 +010034extern int gfs2_diradd_alloc_required(struct inode *dir,
35 const struct qstr *filename);
36extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
37 struct buffer_head **bhp);
Steven Whitehousec7526662006-03-20 12:30:04 -050038
Steven Whitehousecd915492006-09-04 12:49:07 -040039static inline u32 gfs2_disk_hash(const char *data, int len)
Steven Whitehouse71b86f52006-03-28 14:14:04 -050040{
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040041 return crc32_le((u32)~0, data, len) ^ (u32)~0;
Steven Whitehouse71b86f52006-03-28 14:14:04 -050042}
43
44
45static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
46{
47 name->name = fname;
48 name->len = strlen(fname);
49 name->hash = gfs2_disk_hash(name->name, name->len);
50}
51
Steven Whitehousec7526662006-03-20 12:30:04 -050052/* N.B. This probably ought to take inum & type as args as well */
53static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
54{
55 dent->de_inum.no_addr = cpu_to_be64(0);
56 dent->de_inum.no_formal_ino = cpu_to_be64(0);
57 dent->de_hash = cpu_to_be32(name->hash);
58 dent->de_rec_len = cpu_to_be16(reclen);
59 dent->de_name_len = cpu_to_be16(name->len);
60 dent->de_type = cpu_to_be16(0);
61 memset(dent->__pad, 0, sizeof(dent->__pad));
Steven Whitehouse2bdbc5d2006-09-05 09:34:20 -040062 memcpy(dent + 1, name->name, name->len);
Steven Whitehousec7526662006-03-20 12:30:04 -050063}
David Teiglandb3b94fa2006-01-16 16:50:04 +000064
Steven Whitehouse8d123582010-09-17 12:30:23 +010065extern struct qstr gfs2_qdot;
66extern struct qstr gfs2_qdotdot;
67
David Teiglandb3b94fa2006-01-16 16:50:04 +000068#endif /* __DIR_DOT_H__ */