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 20 struct xfs_mount; 21 struct xfs_trans; 22 struct xfs_inode; 23 struct xfs_buf; 24 struct xfs_ifork; 25 struct xfs_name; 26 27 #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ 28 29 struct 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 51 int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen); 52 53 void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp, 54 struct xfs_inode *ip, struct xfs_ifork *ifp); 55 56 extern const struct xfs_buf_ops xfs_symlink_buf_ops; 57 58 #ifdef __KERNEL__ 59 60 int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name, 61 const char *target_path, umode_t mode, struct xfs_inode **ipp); 62 int xfs_readlink(struct xfs_inode *ip, char *link); 63 int xfs_inactive_symlink(struct xfs_inode *ip, struct xfs_trans **tpp); 64 65 #endif /* __KERNEL__ */ 66 #endif /* __XFS_SYMLINK_H */ 67