linux/fs/xfs/xfs_symlink.h
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   1/*
   2 * Copyright (c) 2012 Red Hat, Inc. All rights reserved.
   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#ifndef __XFS_SYMLINK_H
  18#define __XFS_SYMLINK_H 1
  19
  20struct xfs_mount;
  21struct xfs_trans;
  22struct xfs_inode;
  23struct xfs_buf;
  24struct xfs_ifork;
  25struct xfs_name;
  26
  27#define XFS_SYMLINK_MAGIC       0x58534c4d      /* XSLM */
  28
  29struct xfs_dsymlink_hdr {
  30        __be32  sl_magic;
  31        __be32  sl_offset;
  32        __be32  sl_bytes;
  33        __be32  sl_crc;
  34        uuid_t  sl_uuid;
  35        __be64  sl_owner;
  36        __be64  sl_blkno;
  37        __be64  sl_lsn;
  38};
  39
  40/*
  41 * The maximum pathlen is 1024 bytes. Since the minimum file system
  42 * blocksize is 512 bytes, we can get a max of 3 extents back from
  43 * bmapi when crc headers are taken into account.
  44 */
  45#define XFS_SYMLINK_MAPS 3
  46
  47#define XFS_SYMLINK_BUF_SPACE(mp, bufsize)      \
  48        ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
  49                        sizeof(struct xfs_dsymlink_hdr) : 0))
  50
  51int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
  52
  53void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
  54                                 struct xfs_inode *ip, struct xfs_ifork *ifp);
  55
  56extern const struct xfs_buf_ops xfs_symlink_buf_ops;
  57
  58#ifdef __KERNEL__
  59
  60int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
  61                const char *target_path, umode_t mode, struct xfs_inode **ipp);
  62int xfs_readlink(struct xfs_inode *ip, char *link);
  63int xfs_inactive_symlink(struct xfs_inode *ip, struct xfs_trans **tpp);
  64
  65#endif /* __KERNEL__ */
  66#endif /* __XFS_SYMLINK_H */
  67
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