26b59ce6a7
When this feature is enabled, mke2fs doesn't necessarily allocate a super block and its associated descriptor blocks for every group. The (non-)allocations are reflected in the block bitmap. Since the filesystem code doesn't write to these blocks except for the first superblock, all it has to do to support them is to not count them in ext2_statfs() and not attempt to check them at mount time in ext2_check_blocks_bitmap() (the check has never been enabled in FreeBSD anyway).
108 lines
4.8 KiB
C
108 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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 _SYS_GNU_EXT2FS_EXT2_EXTERN_H_
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#define _SYS_GNU_EXT2FS_EXT2_EXTERN_H_
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struct dinode;
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struct ext2_inode;
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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_alloc __P((struct inode *,
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daddr_t, daddr_t, int, struct ucred *, daddr_t *));
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int ext2_balloc __P((struct inode *,
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daddr_t, int, struct ucred *, struct buf **, int));
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int ext2_blkatoff __P((struct vnode *, off_t, char **, struct buf **));
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void ext2_blkfree __P((struct inode *, daddr_t, long));
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daddr_t ext2_blkpref __P((struct inode *, daddr_t, int, daddr_t *, daddr_t));
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int ext2_bmap __P((struct vop_bmap_args *));
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int ext2_init __P((struct vfsconf *));
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int ext2_reallocblks __P((struct vop_reallocblks_args *));
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int ext2_reclaim __P((struct vop_reclaim_args *));
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void ext2_setblock __P((struct ext2_sb_info *, u_char *, daddr_t));
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int ext2_truncate __P((struct vnode *, off_t, int, struct ucred *, struct proc *));
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int ext2_update __P((struct vnode *, int));
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int ext2_valloc __P((struct vnode *, int, struct ucred *, struct vnode **));
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int ext2_vfree __P((struct vnode *, ino_t, int));
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int ext2_lookup __P((struct vop_cachedlookup_args *));
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int ext2_readdir __P((struct vop_readdir_args *));
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void ext2_print_dinode __P((struct dinode *));
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void ext2_print_inode __P((struct inode *));
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int ext2_direnter __P((struct inode *,
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struct vnode *, struct componentname *));
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int ext2_dirremove __P((struct vnode *, struct componentname *));
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int ext2_dirrewrite __P((struct inode *,
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struct inode *, struct componentname *));
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int ext2_dirempty __P((struct inode *, ino_t, struct ucred *));
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int ext2_checkpath __P((struct inode *, struct inode *, struct ucred *));
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struct ext2_group_desc * get_group_desc __P((struct mount * ,
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unsigned int , struct buf ** ));
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int ext2_group_sparse __P((int group));
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void ext2_discard_prealloc __P((struct inode *));
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int ext2_inactive __P((struct vop_inactive_args *));
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int ext2_new_block __P ((struct mount * mp, unsigned long goal,
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u_int32_t * prealloc_count,
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u_int32_t * prealloc_block));
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ino_t ext2_new_inode __P ((const struct inode * dir, int mode));
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unsigned long ext2_count_free __P((struct buf *map, unsigned int numchars));
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void ext2_free_blocks __P((struct mount * mp, unsigned long block,
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unsigned long count));
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void ext2_free_inode __P((struct inode * inode));
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void ext2_ei2di __P((struct ext2_inode *ei, struct dinode *di));
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void ext2_di2ei __P((struct dinode *di, struct ext2_inode *ei));
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void mark_buffer_dirty __P((struct buf *bh));
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/*
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* This macro allows the ufs code to distinguish between an EXT2 and a
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* non-ext2(FFS/LFS) vnode.
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*/
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#define IS_EXT2_VNODE(vp) (vp->v_mount->mnt_stat.f_type == MOUNT_EXT2FS)
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extern vop_t **ext2_vnodeop_p;
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extern vop_t **ext2_specop_p;
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extern vop_t **ext2_fifoop_p;
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#endif /* !_SYS_GNU_EXT2FS_EXT2_EXTERN_H_ */
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