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The NAND Flash environment consists of several distinct components: - NAND framework (drivers harness for NAND controllers and NAND chips) - NAND simulator (NANDsim) - NAND file system (NAND FS) - Companion tools and utilities - Documentation (manual pages) This work is still experimental. Please use with caution. Obtained from: Semihalf Supported by: FreeBSD Foundation, Juniper Networks
214 lines
5.5 KiB
C
214 lines
5.5 KiB
C
/*-
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* Copyright (c) 2010-2012 Semihalf.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/buf.h>
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#include <sys/bio.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <fs/nandfs/nandfs_mount.h>
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#include <fs/nandfs/nandfs.h>
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#include <fs/nandfs/nandfs_subr.h>
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int
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nandfs_node_create(struct nandfsmount *nmp, struct nandfs_node **node,
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uint16_t mode)
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{
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struct nandfs_alloc_request req;
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struct nandfs_device *nandfsdev;
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struct nandfs_mdt *mdt;
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struct nandfs_node *ifile;
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struct nandfs_inode *inode;
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struct vnode *vp;
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uint32_t entry;
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int error = 0;
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nandfsdev = nmp->nm_nandfsdev;
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mdt = &nandfsdev->nd_ifile_mdt;
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ifile = nmp->nm_ifile_node;
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vp = NTOV(ifile);
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VOP_LOCK(vp, LK_EXCLUSIVE);
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/* Allocate new inode in ifile */
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req.entrynum = nandfsdev->nd_last_ino + 1;
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error = nandfs_find_free_entry(mdt, ifile, &req);
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if (error) {
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VOP_UNLOCK(vp, 0);
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return (error);
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}
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error = nandfs_get_entry_block(mdt, ifile, &req, &entry, 1);
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if (error) {
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VOP_UNLOCK(vp, 0);
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return (error);
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}
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/* Inode initialization */
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inode = ((struct nandfs_inode *) req.bp_entry->b_data) + entry;
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nandfs_inode_init(inode, mode);
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error = nandfs_alloc_entry(mdt, &req);
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if (error) {
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VOP_UNLOCK(vp, 0);
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return (error);
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}
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VOP_UNLOCK(vp, 0);
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nandfsdev->nd_last_ino = req.entrynum;
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error = nandfs_get_node(nmp, req.entrynum, node);
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DPRINTF(IFILE, ("%s: node: %p ino: %#jx\n",
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__func__, node, (uintmax_t)((*node)->nn_ino)));
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return (error);
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}
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int
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nandfs_node_destroy(struct nandfs_node *node)
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{
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struct nandfs_alloc_request req;
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struct nandfsmount *nmp;
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struct nandfs_mdt *mdt;
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struct nandfs_node *ifile;
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struct vnode *vp;
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int error = 0;
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nmp = node->nn_nmp;
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req.entrynum = node->nn_ino;
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mdt = &nmp->nm_nandfsdev->nd_ifile_mdt;
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ifile = nmp->nm_ifile_node;
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vp = NTOV(ifile);
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DPRINTF(IFILE, ("%s: destroy node: %p ino: %#jx\n",
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__func__, node, (uintmax_t)node->nn_ino));
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VOP_LOCK(vp, LK_EXCLUSIVE);
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error = nandfs_find_entry(mdt, ifile, &req);
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if (error) {
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nandfs_error("%s: finding entry error:%d node %p(%jx)",
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__func__, error, node, node->nn_ino);
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VOP_UNLOCK(vp, 0);
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return (error);
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}
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nandfs_inode_destroy(&node->nn_inode);
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error = nandfs_free_entry(mdt, &req);
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if (error) {
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nandfs_error("%s: freing entry error:%d node %p(%jx)",
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__func__, error, node, node->nn_ino);
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VOP_UNLOCK(vp, 0);
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return (error);
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}
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VOP_UNLOCK(vp, 0);
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DPRINTF(IFILE, ("%s: freed node %p ino %#jx\n",
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__func__, node, (uintmax_t)node->nn_ino));
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return (error);
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}
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int
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nandfs_node_update(struct nandfs_node *node)
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{
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struct nandfs_alloc_request req;
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struct nandfsmount *nmp;
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struct nandfs_mdt *mdt;
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struct nandfs_node *ifile;
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struct nandfs_inode *inode;
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uint32_t index;
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int error = 0;
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nmp = node->nn_nmp;
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ifile = nmp->nm_ifile_node;
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ASSERT_VOP_LOCKED(NTOV(ifile), __func__);
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req.entrynum = node->nn_ino;
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mdt = &nmp->nm_nandfsdev->nd_ifile_mdt;
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DPRINTF(IFILE, ("%s: node:%p ino:%#jx\n",
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__func__, &node->nn_inode, (uintmax_t)node->nn_ino));
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error = nandfs_get_entry_block(mdt, ifile, &req, &index, 0);
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if (error) {
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printf("nandfs_get_entry_block returned with ERROR=%d\n",
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error);
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return (error);
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}
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inode = ((struct nandfs_inode *) req.bp_entry->b_data) + index;
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memcpy(inode, &node->nn_inode, sizeof(*inode));
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error = nandfs_dirty_buf(req.bp_entry, 0);
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return (error);
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}
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int
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nandfs_get_node_entry(struct nandfsmount *nmp, struct nandfs_inode **inode,
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uint64_t ino, struct buf **bp)
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{
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struct nandfs_alloc_request req;
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struct nandfs_mdt *mdt;
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struct nandfs_node *ifile;
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struct vnode *vp;
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uint32_t index;
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int error = 0;
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req.entrynum = ino;
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mdt = &nmp->nm_nandfsdev->nd_ifile_mdt;
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ifile = nmp->nm_ifile_node;
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vp = NTOV(ifile);
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VOP_LOCK(vp, LK_EXCLUSIVE);
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error = nandfs_get_entry_block(mdt, ifile, &req, &index, 0);
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if (error) {
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VOP_UNLOCK(vp, 0);
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return (error);
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}
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*inode = ((struct nandfs_inode *) req.bp_entry->b_data) + index;
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*bp = req.bp_entry;
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VOP_UNLOCK(vp, 0);
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return (0);
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}
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