| File: | ufs/ext2fs/ext2fs_extents.c |
| Warning: | line 138, column 2 Value stored to 'vp' is never read |
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| 1 | /*- |
| 2 | * Copyright (c) 2010 Zheng Liu <lz@freebsd.org> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 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. |
| 13 | * |
| 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 |
| 24 | * SUCH DAMAGE. |
| 25 | * |
| 26 | * $FreeBSD: head/sys/fs/ext2fs/ext2_extents.c 254260 2013-08-12 21:34:48Z pfg $ |
| 27 | */ |
| 28 | |
| 29 | #include <sys/param.h> |
| 30 | #include <sys/systm.h> |
| 31 | #include <sys/kernel.h> |
| 32 | #include <sys/malloc.h> |
| 33 | #include <sys/vnode.h> |
| 34 | #include <sys/mount.h> |
| 35 | #include <sys/buf.h> |
| 36 | |
| 37 | #include <ufs/ufs/quota.h> |
| 38 | #include <ufs/ufs/ufsmount.h> |
| 39 | #include <ufs/ufs/inode.h> |
| 40 | #include <ufs/ext2fs/ext2fs.h> |
| 41 | #include <ufs/ext2fs/ext2fs_extents.h> |
| 42 | #include <ufs/ext2fs/ext2fs_extern.h> |
| 43 | |
| 44 | static void ext4_ext_binsearch_index(struct inode *ip, struct ext4_extent_path |
| 45 | *path, daddr_t lbn) |
| 46 | { |
| 47 | struct ext4_extent_header *ehp = path->ep_header; |
| 48 | struct ext4_extent_index *l, *r, *m; |
| 49 | |
| 50 | l = (struct ext4_extent_index *)(char *)(ehp + 1); |
| 51 | r = (struct ext4_extent_index *)(char *)(ehp + 1) + ehp->eh_ecount - 1; |
| 52 | while (l <= r) { |
| 53 | m = l + (r - l) / 2; |
| 54 | if (lbn < m->ei_blk) |
| 55 | r = m - 1; |
| 56 | else |
| 57 | l = m + 1; |
| 58 | } |
| 59 | |
| 60 | path->ep_index = l - 1; |
| 61 | } |
| 62 | |
| 63 | static void |
| 64 | ext4_ext_binsearch(struct inode *ip, struct ext4_extent_path *path, daddr_t lbn) |
| 65 | { |
| 66 | struct ext4_extent_header *ehp = path->ep_header; |
| 67 | struct ext4_extent *l, *r, *m; |
| 68 | |
| 69 | if (ehp->eh_ecount == 0) |
| 70 | return; |
| 71 | |
| 72 | l = (struct ext4_extent *)(char *)(ehp + 1); |
| 73 | r = (struct ext4_extent *)(char *)(ehp + 1) + ehp->eh_ecount - 1; |
| 74 | while (l <= r) { |
| 75 | m = l + (r - l) / 2; |
| 76 | if (lbn < m->e_blk) |
| 77 | r = m - 1; |
| 78 | else |
| 79 | l = m + 1; |
| 80 | } |
| 81 | |
| 82 | path->ep_ext = l - 1; |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Find a block in ext4 extent cache. |
| 87 | */ |
| 88 | int |
| 89 | ext4_ext_in_cache(struct inode *ip, daddr_t lbn, struct ext4_extent *ep) |
| 90 | { |
| 91 | struct ext4_extent_cache *ecp; |
| 92 | int ret = EXT4_EXT_CACHE_NO0; |
| 93 | |
| 94 | ecp = &ip->i_e2fs_ext_cacheinode_ext.e2fs.ext2fs_extent_cache; |
| 95 | |
| 96 | /* cache is invalid */ |
| 97 | if (ecp->ec_type == EXT4_EXT_CACHE_NO0) |
| 98 | return (ret); |
| 99 | |
| 100 | if (lbn >= ecp->ec_blk && lbn < ecp->ec_blk + ecp->ec_len) { |
| 101 | ep->e_blk = ecp->ec_blk; |
| 102 | ep->e_start_lo = ecp->ec_start & 0xffffffff; |
| 103 | ep->e_start_hi = ecp->ec_start >> 32 & 0xffff; |
| 104 | ep->e_len = ecp->ec_len; |
| 105 | ret = ecp->ec_type; |
| 106 | } |
| 107 | return (ret); |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Put an ext4_extent structure in ext4 cache. |
| 112 | */ |
| 113 | void |
| 114 | ext4_ext_put_cache(struct inode *ip, struct ext4_extent *ep, int type) |
| 115 | { |
| 116 | struct ext4_extent_cache *ecp; |
| 117 | |
| 118 | ecp = &ip->i_e2fs_ext_cacheinode_ext.e2fs.ext2fs_extent_cache; |
| 119 | ecp->ec_type = type; |
| 120 | ecp->ec_blk = ep->e_blk; |
| 121 | ecp->ec_len = ep->e_len; |
| 122 | ecp->ec_start = (daddr_t)ep->e_start_hi << 32 | ep->e_start_lo; |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * Find an extent. |
| 127 | */ |
| 128 | struct ext4_extent_path * |
| 129 | ext4_ext_find_extent(struct m_ext2fs *fs, struct inode *ip, |
| 130 | daddr_t lbn, struct ext4_extent_path *path) |
| 131 | { |
| 132 | struct vnode *vp; |
| 133 | struct ext4_extent_header *ehp; |
| 134 | uint16_t i; |
| 135 | int error; |
| 136 | daddr_t nblk; |
| 137 | |
| 138 | vp = ITOV(ip)((ip)->i_vnode); |
Value stored to 'vp' is never read | |
| 139 | ehp = (struct ext4_extent_header *)(char *)ip->i_e2fs_blocksdinode_u.e2fs_din->e2di_blocks; |
| 140 | |
| 141 | if (ehp->eh_magic != EXT4_EXT_MAGIC0xf30a) |
| 142 | return (NULL((void *)0)); |
| 143 | |
| 144 | path->ep_header = ehp; |
| 145 | |
| 146 | for (i = ehp->eh_depth; i != 0; --i) { |
| 147 | ext4_ext_binsearch_index(ip, path, lbn); |
| 148 | path->ep_depth = 0; |
| 149 | path->ep_ext = NULL((void *)0); |
| 150 | |
| 151 | nblk = (daddr_t)path->ep_index->ei_leaf_hi << 32 | |
| 152 | path->ep_index->ei_leaf_lo; |
| 153 | if (path->ep_bp != NULL((void *)0)) { |
| 154 | brelse(path->ep_bp); |
| 155 | path->ep_bp = NULL((void *)0); |
| 156 | } |
| 157 | error = bread(ip->i_devvpi_ump->um_devvp, fsbtodb(fs, nblk)((nblk) << (fs)->e2fs_fsbtodb), fs->e2fs_fsize, |
| 158 | &path->ep_bp); |
| 159 | if (error) { |
| 160 | brelse(path->ep_bp); |
| 161 | path->ep_bp = NULL((void *)0); |
| 162 | return (NULL((void *)0)); |
| 163 | } |
| 164 | ehp = (struct ext4_extent_header *)path->ep_bp->b_data; |
| 165 | path->ep_header = ehp; |
| 166 | } |
| 167 | |
| 168 | path->ep_depth = i; |
| 169 | path->ep_ext = NULL((void *)0); |
| 170 | path->ep_index = NULL((void *)0); |
| 171 | |
| 172 | ext4_ext_binsearch(ip, path, lbn); |
| 173 | return (path); |
| 174 | } |