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 v.2.
   8  */
   9
  10 #ifndef __DIR_DOT_H__
  11 #define __DIR_DOT_H__
  12
  13 /**
  14  * gfs2_filldir_t - Report a directory entry to the caller of gfs2_dir_read()
  15  * @opaque: opaque data used by the function
  16  * @name: the name of the directory entry
  17  * @length: the length of the name
  18  * @offset: the entry's offset in the directory
  19  * @inum: the inode number the entry points to
  20  * @type: the type of inode the entry points to
  21  *
  22  * Returns: 0 on success, 1 if buffer full
  23  */
  24
  25 typedef int (*gfs2_filldir_t) (void *opaque,
  26                               const char *name, unsigned int length,
  27                               uint64_t offset,
  28                               struct gfs2_inum *inum, unsigned int type);
  29
  30 int gfs2_dir_search(struct inode *dir, const struct qstr *filename,
  31                     struct gfs2_inum *inum, unsigned int *type);
  32 int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
  33                  const struct gfs2_inum *inum, unsigned int type);
  34 int gfs2_dir_del(struct gfs2_inode *dip, const struct qstr *filename);
  35 int gfs2_dir_read(struct inode *inode, uint64_t * offset, void *opaque,
  36                   gfs2_filldir_t filldir);
  37 int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
  38                    struct gfs2_inum *new_inum, unsigned int new_type);
  39
  40 int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
  41
  42 int gfs2_diradd_alloc_required(struct inode *dir,
  43                                const struct qstr *filename);
  44 int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, uint64_t block,
  45                             struct buffer_head **bhp);
  46
  47 static inline uint32_t gfs2_disk_hash(const char *data, int len)
  48 {
  49         return crc32_le(0xFFFFFFFF, data, len) ^ 0xFFFFFFFF;
  50 }
  51
  52
  53 static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
  54 {
  55         name->name = fname;
  56         name->len = strlen(fname);
  57         name->hash = gfs2_disk_hash(name->name, name->len);
  58 }
  59
  60 /* N.B. This probably ought to take inum & type as args as well */
  61 static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
  62 {
  63         dent->de_inum.no_addr = cpu_to_be64(0);
  64         dent->de_inum.no_formal_ino = cpu_to_be64(0);
  65         dent->de_hash = cpu_to_be32(name->hash);
  66         dent->de_rec_len = cpu_to_be16(reclen);
  67         dent->de_name_len = cpu_to_be16(name->len);
  68         dent->de_type = cpu_to_be16(0);
  69         memset(dent->__pad, 0, sizeof(dent->__pad));
  70         memcpy((char*)(dent+1), name->name, name->len);
  71 }
  72
  73 #endif /* __DIR_DOT_H__ */