233 lines
6.2 KiB
C
233 lines
6.2 KiB
C
/* $NetBSD: ext2fs_extents.c,v 1.3 2016/08/13 07:40:10 christos Exp $ */
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/*-
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* Copyright (c) 2010 Zheng Liu <lz@freebsd.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD: head/sys/fs/ext2fs/ext2_extents.c 295523 2016-02-11 15:27:14Z pfg $
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ext2fs_extents.c,v 1.3 2016/08/13 07:40:10 christos Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h>
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#include <sys/kernel.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/signalvar.h>
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#include <sys/kauth.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ext2fs/ext2fs.h>
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#include <ufs/ext2fs/ext2fs_extents.h>
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#include <ufs/ext2fs/ext2fs_extern.h>
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static bool
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ext4_ext_binsearch_index(struct inode *ip, struct ext4_extent_path *path,
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daddr_t lbn, daddr_t *first_lbn, daddr_t *last_lbn)
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{
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struct ext4_extent_header *ehp = path->ep_header;
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struct ext4_extent_index *first, *last, *l, *r, *m;
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first = (struct ext4_extent_index *)(char *)(ehp + 1);
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last = first + ehp->eh_ecount - 1;
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l = first;
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r = last;
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while (l <= r) {
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m = l + (r - l) / 2;
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if (lbn < m->ei_blk)
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r = m - 1;
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else
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l = m + 1;
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}
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if (l == first) {
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path->ep_sparse_ext.e_blk = *first_lbn;
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path->ep_sparse_ext.e_len = first->ei_blk - *first_lbn;
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path->ep_sparse_ext.e_start_hi = 0;
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path->ep_sparse_ext.e_start_lo = 0;
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path->ep_is_sparse = true;
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return true;
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}
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path->ep_index = l - 1;
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*first_lbn = path->ep_index->ei_blk;
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if (path->ep_index < last)
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*last_lbn = l->ei_blk - 1;
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return false;
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}
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static void
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ext4_ext_binsearch(struct inode *ip, struct ext4_extent_path *path, daddr_t lbn,
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daddr_t first_lbn, daddr_t last_lbn)
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{
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struct ext4_extent_header *ehp = path->ep_header;
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struct ext4_extent *first, *l, *r, *m;
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if (ehp->eh_ecount == 0)
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return;
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first = (struct ext4_extent *)(char *)(ehp + 1);
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l = first;
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r = first + ehp->eh_ecount - 1;
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while (l <= r) {
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m = l + (r - l) / 2;
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if (lbn < m->e_blk)
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r = m - 1;
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else
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l = m + 1;
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}
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if (l == first) {
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path->ep_sparse_ext.e_blk = first_lbn;
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path->ep_sparse_ext.e_len = first->e_blk - first_lbn;
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path->ep_sparse_ext.e_start_hi = 0;
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path->ep_sparse_ext.e_start_lo = 0;
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path->ep_is_sparse = true;
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return;
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}
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path->ep_ext = l - 1;
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if (path->ep_ext->e_blk + path->ep_ext->e_len <= lbn) {
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path->ep_sparse_ext.e_blk = path->ep_ext->e_blk +
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path->ep_ext->e_len;
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if (l <= (first + ehp->eh_ecount - 1))
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path->ep_sparse_ext.e_len = l->e_blk -
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path->ep_sparse_ext.e_blk;
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else
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path->ep_sparse_ext.e_len = last_lbn -
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path->ep_sparse_ext.e_blk + 1;
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path->ep_sparse_ext.e_start_hi = 0;
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path->ep_sparse_ext.e_start_lo = 0;
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path->ep_is_sparse = true;
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}
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}
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/*
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* Find a block in ext4 extent cache.
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*/
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int
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ext4_ext_in_cache(struct inode *ip, daddr_t lbn, struct ext4_extent *ep)
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{
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struct ext4_extent_cache *ecp;
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int ret = EXT4_EXT_CACHE_NO;
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ecp = &ip->inode_ext.e2fs.i_ext_cache;
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/* cache is invalid */
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if (ecp->ec_type == EXT4_EXT_CACHE_NO)
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return ret;
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if (lbn >= ecp->ec_blk && lbn < ecp->ec_blk + ecp->ec_len) {
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ep->e_blk = ecp->ec_blk;
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ep->e_start_lo = ecp->ec_start & 0xffffffff;
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ep->e_start_hi = ecp->ec_start >> 32 & 0xffff;
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ep->e_len = ecp->ec_len;
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ret = ecp->ec_type;
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}
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return ret;
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}
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/*
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* Put an ext4_extent structure in ext4 cache.
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*/
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void
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ext4_ext_put_cache(struct inode *ip, struct ext4_extent *ep, int type)
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{
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struct ext4_extent_cache *ecp;
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ecp = &ip->inode_ext.e2fs.i_ext_cache;
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ecp->ec_type = type;
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ecp->ec_blk = ep->e_blk;
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ecp->ec_len = ep->e_len;
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ecp->ec_start = (daddr_t)ep->e_start_hi << 32 | ep->e_start_lo;
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}
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/*
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* Find an extent.
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*/
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struct ext4_extent_path *
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ext4_ext_find_extent(struct m_ext2fs *fs, struct inode *ip,
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daddr_t lbn, struct ext4_extent_path *path)
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{
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struct ext4_extent_header *ehp;
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uint16_t i;
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int error, size;
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daddr_t nblk;
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ehp = (struct ext4_extent_header *)ip->i_din.e2fs_din->e2di_blocks;
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if (ehp->eh_magic != EXT4_EXT_MAGIC)
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return NULL;
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path->ep_header = ehp;
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daddr_t first_lbn = 0;
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daddr_t last_lbn = lblkno(ip->i_e2fs, ip->i_size);
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for (i = ehp->eh_depth; i != 0; --i) {
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path->ep_depth = i;
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path->ep_ext = NULL;
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if (ext4_ext_binsearch_index(ip, path, lbn, &first_lbn,
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&last_lbn)) {
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return path;
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}
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nblk = (daddr_t)path->ep_index->ei_leaf_hi << 32 |
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path->ep_index->ei_leaf_lo;
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size = blksize(fs, ip, nblk);
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if (path->ep_bp != NULL) {
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brelse(path->ep_bp, 0);
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path->ep_bp = NULL;
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}
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error = bread(ip->i_devvp, fsbtodb(fs, nblk), size, 0,
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&path->ep_bp);
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if (error) {
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brelse(path->ep_bp, 0);
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path->ep_bp = NULL;
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return NULL;
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}
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ehp = (struct ext4_extent_header *)path->ep_bp->b_data;
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path->ep_header = ehp;
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}
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path->ep_depth = i;
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path->ep_ext = NULL;
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path->ep_index = NULL;
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path->ep_is_sparse = false;
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ext4_ext_binsearch(ip, path, lbn, first_lbn, last_lbn);
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return path;
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}
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