2 * Copyright (c) 2010 Zheng Liu <lz@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/types.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/vnode.h>
39 #include <fs/ext2fs/ext2_mount.h>
40 #include <fs/ext2fs/fs.h>
41 #include <fs/ext2fs/inode.h>
42 #include <fs/ext2fs/ext2fs.h>
43 #include <fs/ext2fs/ext2_extents.h>
44 #include <fs/ext2fs/ext2_extern.h>
46 static void ext4_ext_binsearch_index(struct inode *ip, struct ext4_extent_path
49 struct ext4_extent_header *ehp = path->ep_header;
50 struct ext4_extent_index *l, *r, *m;
52 l = (struct ext4_extent_index *)(char *)(ehp + 1);
53 r = (struct ext4_extent_index *)(char *)(ehp + 1) + ehp->eh_ecount - 1;
62 path->ep_index = l - 1;
66 ext4_ext_binsearch(struct inode *ip, struct ext4_extent_path *path, daddr_t lbn)
68 struct ext4_extent_header *ehp = path->ep_header;
69 struct ext4_extent *l, *r, *m;
71 if (ehp->eh_ecount == 0)
74 l = (struct ext4_extent *)(char *)(ehp + 1);
75 r = (struct ext4_extent *)(char *)(ehp + 1) + ehp->eh_ecount - 1;
88 * Find a block in ext4 extent cache.
91 ext4_ext_in_cache(struct inode *ip, daddr_t lbn, struct ext4_extent *ep)
93 struct ext4_extent_cache *ecp;
94 int ret = EXT4_EXT_CACHE_NO;
96 ecp = &ip->i_ext_cache;
98 /* cache is invalid */
99 if (ecp->ec_type == EXT4_EXT_CACHE_NO)
102 if (lbn >= ecp->ec_blk && lbn < ecp->ec_blk + ecp->ec_len) {
103 ep->e_blk = ecp->ec_blk;
104 ep->e_start_lo = ecp->ec_start & 0xffffffff;
105 ep->e_start_hi = ecp->ec_start >> 32 & 0xffff;
106 ep->e_len = ecp->ec_len;
113 * Put an ext4_extent structure in ext4 cache.
116 ext4_ext_put_cache(struct inode *ip, struct ext4_extent *ep, int type)
118 struct ext4_extent_cache *ecp;
120 ecp = &ip->i_ext_cache;
122 ecp->ec_blk = ep->e_blk;
123 ecp->ec_len = ep->e_len;
124 ecp->ec_start = (daddr_t)ep->e_start_hi << 32 | ep->e_start_lo;
130 struct ext4_extent_path *
131 ext4_ext_find_extent(struct m_ext2fs *fs, struct inode *ip,
132 daddr_t lbn, struct ext4_extent_path *path)
134 struct ext4_extent_header *ehp;
139 ehp = (struct ext4_extent_header *)(char *)ip->i_db;
141 if (ehp->eh_magic != EXT4_EXT_MAGIC)
144 path->ep_header = ehp;
146 for (i = ehp->eh_depth; i != 0; --i) {
147 ext4_ext_binsearch_index(ip, path, lbn);
151 nblk = (daddr_t)path->ep_index->ei_leaf_hi << 32 |
152 path->ep_index->ei_leaf_lo;
153 size = blksize(fs, ip, nblk);
154 if (path->ep_bp != NULL) {
158 error = bread(ip->i_devvp, fsbtodb(fs, nblk), size, NOCRED,
165 ehp = (struct ext4_extent_header *)path->ep_bp->b_data;
166 path->ep_header = ehp;
171 path->ep_index = NULL;
173 ext4_ext_binsearch(ip, path, lbn);