LXR linux/fs/gfs2/dir.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5 */
   6
   7#ifndef __DIR_DOT_H__
   8#define __DIR_DOT_H__
   9
  10#include <linux/dcache.h>
  11#include <linux/crc32.h>
  12
  13struct inode;
  14struct gfs2_inode;
  15struct gfs2_inum;
  16struct buffer_head;
  17struct gfs2_dirent;
  18
  19struct gfs2_diradd {
  20        unsigned nr_blocks;
  21        struct gfs2_dirent *dent;
  22        struct buffer_head *bh;
  23        int save_loc;
  24};
  25
  26extern struct inode *gfs2_dir_search(struct inode *dir,
  27                                     const struct qstr *filename,
  28                                     bool fail_on_exist);
  29extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
  30                          const struct gfs2_inode *ip);
  31extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
  32                        const struct gfs2_inode *ip, struct gfs2_diradd *da);
  33static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
  34{
  35        brelse(da->bh);
  36        da->bh = NULL;
  37}
  38extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
  39extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
  40                         struct file_ra_state *f_ra);
  41extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
  42                          const struct gfs2_inode *nip, unsigned int new_type);
  43
  44extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
  45
  46extern int gfs2_diradd_alloc_required(struct inode *dir,
  47                                      const struct qstr *filename,
  48                                      struct gfs2_diradd *da);
  49extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
  50                                   struct buffer_head **bhp);
  51extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
  52
  53static inline u32 gfs2_disk_hash(const char *data, int len)
  54{
  55        return crc32_le((u32)~0, data, len) ^ (u32)~0;
  56}
  57
  58
  59static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
  60{
  61        name->name = fname;
  62        name->len = strlen(fname);
  63        name->hash = gfs2_disk_hash(name->name, name->len);
  64}
  65
  66/* N.B. This probably ought to take inum & type as args as well */
  67static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
  68{
  69        dent->de_inum.no_addr = cpu_to_be64(0);
  70        dent->de_inum.no_formal_ino = cpu_to_be64(0);
  71        dent->de_hash = cpu_to_be32(name->hash);
  72        dent->de_rec_len = cpu_to_be16(reclen);
  73        dent->de_name_len = cpu_to_be16(name->len);
  74        dent->de_type = cpu_to_be16(0);
  75        memset(dent->__pad, 0, sizeof(dent->__pad));
  76        memcpy(dent + 1, name->name, name->len);
  77}
  78
  79extern struct qstr gfs2_qdot;
  80extern struct qstr gfs2_qdotdot;
  81
  82#endif /* __DIR_DOT_H__ */
  83