core/fs/xfs/xfs_dir2.h

   1 /*
   2  * Copyright (c) 2012 Paulo Alcantara <pcacjr@zytor.com>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write the Free Software Foundation,
  15  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  16  */
  17
  18 #ifndef XFS_DIR2_H_
  19 #define XFS_DIR2_H_
  20
  21 #include <core.h>
  22 #include <fs.h>
  23
  24 #include "xfs.h"
  25
  26 const void *xfs_dir2_dirblks_get_cached(struct fs_info *fs, block_t startblock,
  27                                         xfs_filblks_t c);
  28 void xfs_dir2_dirblks_flush_cache(void);
  29
  30 uint32_t xfs_dir2_da_hashname(const uint8_t *name, int namelen);
  31
  32 block_t xfs_dir2_get_right_blk(struct fs_info *fs, xfs_dinode_t *core,
  33                                block_t fsblkno, int *error);
  34
  35 struct inode *xfs_dir2_local_find_entry(const char *dname, struct inode *parent,
  36                                         xfs_dinode_t *core);
  37 struct inode *xfs_dir2_block_find_entry(const char *dname, struct inode *parent,
  38                                         xfs_dinode_t *core);
  39 struct inode *xfs_dir2_leaf_find_entry(const char *dname, struct inode *parent,
  40                                        xfs_dinode_t *core);
  41 struct inode *xfs_dir2_node_find_entry(const char *dname, struct inode *parent,
  42                                        xfs_dinode_t *core);
  43
  44 static inline bool xfs_dir2_isleaf(struct fs_info *fs, xfs_dinode_t *dip)
  45 {
  46     uint64_t last = 0;
  47     xfs_bmbt_irec_t irec;
  48
  49     bmbt_irec_get(&irec, ((xfs_bmbt_rec_t *)&dip->di_literal_area[0]) +
  50                          be32_to_cpu(dip->di_nextents) - 1);
  51     last = irec.br_startoff + irec.br_blockcount;
  52
  53     return (last == XFS_INFO(fs)->dirleafblk + (1 << XFS_INFO(fs)->dirblklog));
  54 }
  55
  56 static inline int xfs_dir2_entry_name_cmp(uint8_t *start, uint8_t *end,
  57                                           const char *name)
  58 {
  59     if (!name || (strlen(name) != end - start))
  60         return -1;
  61
  62     while (start < end)
  63         if (*start++ != *name++)
  64             return -1;
  65
  66     return 0;
  67 }
  68
  69 #endif /* XFS_DIR2_H_ */