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
  15 struct inode;
  16 struct gfs2_inode;
  17 struct gfs2_inum;
  18
  19 struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *filename);
  20 int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
  21                    const struct gfs2_inode *ip);
  22 int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
  23                  const struct gfs2_inode *ip, unsigned int type);
  24 int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
  25 int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
  26                   filldir_t filldir);
  27 int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
  28                    const struct gfs2_inode *nip, unsigned int new_type);
  29
  30 int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
  31
  32 int gfs2_diradd_alloc_required(struct inode *dir,
  33                                const struct qstr *filename);
  34 int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
  35                             struct buffer_head **bhp);
  36
  37 static inline u32 gfs2_disk_hash(const char *data, int len)
  38 {
  39         return crc32_le((u32)~0, data, len) ^ (u32)~0;
  40 }
  41
  42
  43 static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
  44 {
  45         name->name = fname;
  46         name->len = strlen(fname);
  47         name->hash = gfs2_disk_hash(name->name, name->len);
  48 }
  49
  50 /* N.B. This probably ought to take inum & type as args as well */
  51 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
  52 {
  53         dent->de_inum.no_addr = cpu_to_be64(0);
  54         dent->de_inum.no_formal_ino = cpu_to_be64(0);
  55         dent->de_hash = cpu_to_be32(name->hash);
  56         dent->de_rec_len = cpu_to_be16(reclen);
  57         dent->de_name_len = cpu_to_be16(name->len);
  58         dent->de_type = cpu_to_be16(0);
  59         memset(dent->__pad, 0, sizeof(dent->__pad));
  60         memcpy(dent + 1, name->name, name->len);
  61 }
  62
  63 #endif /* __DIR_DOT_H__ */