0aef936cbe
1) Comply with the way buffercache(9) is intended to be used. Now we
read in single blocks of EFS_BB_SIZE, never taking in variable
length extents with a single bread() call.
2) Handle symlinks with more than one extent. There's no reason for
this to ever happen, but it's handled now.
3) Finally, add a hint to our iteration initialiser so we can start
from the desired offset, rather than naively looping through from
the beginning each time. Since we can binary search the correct
location quickly, this improves large sequential reads by about
40% with 128MB files. Improvement should increase with file size.
49 lines
2.0 KiB
C
49 lines
2.0 KiB
C
/* $NetBSD: efs_subr.h,v 1.2 2007/07/04 19:24:09 rumble Exp $ */
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/*
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* Copyright (c) 2006 Stephen M. Rumble <rumble@ephemeral.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _FS_EFS_EFS_SUBR_H_
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#define _FS_EFS_EFS_SUBR_H_
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extern struct pool efs_inode_pool;
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struct efs_extent_iterator {
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struct efs_inode *exi_eip;
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off_t exi_next; /* next logical extent*/
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off_t exi_dnext; /* next direct extent */
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off_t exi_innext; /* next indirect ext. */
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};
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int32_t efs_sb_checksum(struct efs_sb *, int);
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int efs_sb_validate(struct efs_sb *, const char **);
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void efs_locate_inode(ino_t, struct efs_sb *, uint32_t *, int *);
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int efs_read_inode(struct efs_mount *, ino_t, struct lwp *,
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struct efs_dinode *);
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void efs_dextent_to_extent(struct efs_dextent *, struct efs_extent *);
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void efs_extent_to_dextent(struct efs_extent *, struct efs_dextent *);
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int efs_inode_lookup(struct efs_mount *, struct efs_inode *,
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struct componentname *, ino_t *);
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int efs_bread(struct efs_mount *, uint32_t, struct lwp *, struct buf **);
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void efs_sync_inode_to_dinode(struct efs_inode *);
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void efs_sync_dinode_to_inode(struct efs_inode *);
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void efs_extent_iterator_init(struct efs_extent_iterator *,
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struct efs_inode *, off_t);
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int efs_extent_iterator_next(struct efs_extent_iterator *,
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struct efs_extent *);
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#endif /* !_FS_EFS_EFS_SUBR_H_ */
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