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/*
* Copyright (c) 2012 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_SYMLINK_H
#define __XFS_SYMLINK_H 1
struct xfs_mount;
struct xfs_trans;
struct xfs_inode;
struct xfs_buf;
struct xfs_ifork;
struct xfs_name;
#define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */
struct xfs_dsymlink_hdr {
__be32 sl_magic;
__be32 sl_offset;
__be32 sl_bytes;
__be32 sl_crc;
uuid_t sl_uuid;
__be64 sl_owner;
__be64 sl_blkno;
__be64 sl_lsn;
};
/*
* The maximum pathlen is 1024 bytes. Since the minimum file system
* blocksize is 512 bytes, we can get a max of 3 extents back from
* bmapi when crc headers are taken into account.
*/
#define XFS_SYMLINK_MAPS 3
#define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \
((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \
sizeof(struct xfs_dsymlink_hdr) : 0))
int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
bool xfs_symlink_hdr_ok(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
uint32_t size, struct xfs_buf *bp);
void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
struct xfs_inode *ip, struct xfs_ifork *ifp);
extern const struct xfs_buf_ops xfs_symlink_buf_ops;
#ifdef __KERNEL__
int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
const char *target_path, umode_t mode, struct xfs_inode **ipp);
int xfs_readlink(struct xfs_inode *ip, char *link);
int xfs_inactive_symlink(struct xfs_inode *ip, struct xfs_trans **tpp);
#endif /* __KERNEL__ */
#endif /* __XFS_SYMLINK_H */
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