LXR linux/fs/gfs2/dir.h

   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#ifndef __DIR_DOT_H__
  11#define __DIR_DOT_H__
  12
  13#include <linux/dcache.h>
  14#include <linux/crc32.h>
  15
  16struct inode;
  17struct gfs2_inode;
  18struct gfs2_inum;
  19
  20struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *filename);
  21int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
  22                   const struct gfs2_inode *ip);
  23int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
  24                 const struct gfs2_inode *ip, unsigned int type);
  25int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
  26int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
  27                  filldir_t filldir);
  28int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
  29                   const struct gfs2_inode *nip, unsigned int new_type);
  30
  31int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
  32
  33int gfs2_diradd_alloc_required(struct inode *dir,
  34                               const struct qstr *filename);
  35int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
  36                            struct buffer_head **bhp);
  37
  38static inline u32 gfs2_disk_hash(const char *data, int len)
  39{
  40        return crc32_le((u32)~0, data, len) ^ (u32)~0;
  41}
  42
  43
  44static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
  45{
  46        name->name = fname;
  47        name->len = strlen(fname);
  48        name->hash = gfs2_disk_hash(name->name, name->len);
  49}
  50
  51/* N.B. This probably ought to take inum & type as args as well */
  52static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
  53{
  54        dent->de_inum.no_addr = cpu_to_be64(0);
  55        dent->de_inum.no_formal_ino = cpu_to_be64(0);
  56        dent->de_hash = cpu_to_be32(name->hash);
  57        dent->de_rec_len = cpu_to_be16(reclen);
  58        dent->de_name_len = cpu_to_be16(name->len);
  59        dent->de_type = cpu_to_be16(0);
  60        memset(dent->__pad, 0, sizeof(dent->__pad));
  61        memcpy(dent + 1, name->name, name->len);
  62}
  63
  64#endif /* __DIR_DOT_H__ */
  65