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