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f948dd76dd
Add a header to the remote symlink block, containing location and owner information, as well as CRCs and LSN fields. This requires verifiers to be added to the remote symlink buffers for CRC enabled filesystems. This also fixes a bug reading multiple block symlinks, where the second block overwrites the first block when copying out the link name. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Ben Myers <bpm@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
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_rmt(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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