d7511a40a7
Basic support for extents was implemented by Zheng Liu as part of his Google Summer of Code in 2010. This support is read-only at this time. In addition to extents we also support the huge_file extension for read-only purposes. This works nicely with the additional support for birthtime/nanosec timestamps and dir_index that have been added lately. The implementation may not work for all ext4 filesystems as it doesn't support some features that are being enabled by default on recent linux like flex_bg. Nevertheless, the feature should be very useful for migration or simple access in filesystems that have been converted from ext2/3 or don't use incompatible features. Special thanks to Zheng Liu for his dedication and continued work to support ext2 in FreeBSD. Submitted by: Zheng Liu (lz@) Reviewed by: Mike Ma, Christoph Mallon (previous version) Sponsored by: Google Inc. MFC after: 3 weeks
112 lines
4.8 KiB
C
112 lines
4.8 KiB
C
/*-
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* modified for EXT2FS support in Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_extern.h 8.3 (Berkeley) 4/16/94
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* $FreeBSD$
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*/
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#ifndef _FS_EXT2FS_EXT2_EXTERN_H_
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#define _FS_EXT2FS_EXT2_EXTERN_H_
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struct ext2fs_dinode;
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struct ext2fs_direct_2;
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struct ext2fs_searchslot;
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struct indir;
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struct inode;
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struct mount;
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struct vfsconf;
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struct vnode;
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int ext2_add_entry(struct vnode *, struct ext2fs_direct_2 *);
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int ext2_alloc(struct inode *,
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int32_t, int32_t, int, struct ucred *, int32_t *);
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int ext2_balloc(struct inode *,
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e2fs_lbn_t, int, struct ucred *, struct buf **, int);
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int ext2_blkatoff(struct vnode *, off_t, char **, struct buf **);
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void ext2_blkfree(struct inode *, int32_t, long);
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int32_t ext2_blkpref(struct inode *, e2fs_lbn_t, int, int32_t *, int32_t);
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int ext2_bmap(struct vop_bmap_args *);
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int ext2_bmaparray(struct vnode *, int32_t, int64_t *, int *, int *);
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void ext2_clusteracct(struct m_ext2fs *, char *, int, daddr_t, int);
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void ext2_dirbad(struct inode *ip, doff_t offset, char *how);
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void ext2_ei2i(struct ext2fs_dinode *, struct inode *);
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int ext2_getlbns(struct vnode *, int32_t, struct indir *, int *);
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void ext2_i2ei(struct inode *, struct ext2fs_dinode *);
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void ext2_itimes(struct vnode *vp);
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int ext2_reallocblks(struct vop_reallocblks_args *);
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int ext2_reclaim(struct vop_reclaim_args *);
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void ext2_setblock(struct m_ext2fs *, u_char *, int32_t);
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int ext2_truncate(struct vnode *, off_t, int, struct ucred *, struct thread *);
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int ext2_update(struct vnode *, int);
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int ext2_valloc(struct vnode *, int, struct ucred *, struct vnode **);
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int ext2_vfree(struct vnode *, ino_t, int);
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int ext2_vinit(struct mount *, struct vop_vector *, struct vnode **vpp);
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int ext2_lookup(struct vop_cachedlookup_args *);
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int ext2_readdir(struct vop_readdir_args *);
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void ext2_print_inode(struct inode *);
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int ext2_direnter(struct inode *,
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struct vnode *, struct componentname *);
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int ext2_dirremove(struct vnode *, struct componentname *);
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int ext2_dirrewrite(struct inode *,
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struct inode *, struct componentname *);
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int ext2_dirempty(struct inode *, ino_t, struct ucred *);
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int ext2_checkpath(struct inode *, struct inode *, struct ucred *);
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int cg_has_sb(int i);
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int ext2_inactive(struct vop_inactive_args *);
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int ext2_htree_add_entry(struct vnode *, struct ext2fs_direct_2 *,
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struct componentname *);
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int ext2_htree_create_index(struct vnode *, struct componentname *,
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struct ext2fs_direct_2 *);
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int ext2_htree_has_idx(struct inode *);
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int ext2_htree_hash(const char *, int, uint32_t *, int, uint32_t *,
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uint32_t *);
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int ext2_htree_lookup(struct inode *, const char *, int, struct buf **,
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int *, doff_t *, doff_t *, doff_t *, struct ext2fs_searchslot *);
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int ext2_search_dirblock(struct inode *, void *, int *, const char *, int,
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int *, doff_t *, doff_t *, doff_t *, struct ext2fs_searchslot *);
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/* Flags to low-level allocation routines.
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* The low 16-bits are reserved for IO_ flags from vnode.h.
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*/
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#define BA_CLRBUF 0x00010000 /* Clear invalid areas of buffer. */
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#define BA_SEQMASK 0x7F000000 /* Bits holding seq heuristic. */
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#define BA_SEQSHIFT 24
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#define BA_SEQMAX 0x7F
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extern struct vop_vector ext2_vnodeops;
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extern struct vop_vector ext2_fifoops;
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#endif /* !_FS_EXT2FS_EXT2_EXTERN_H_ */
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