d2d3e8751c
structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
578 lines
15 KiB
C
578 lines
15 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)lfs_syscalls.c 8.5 (Berkeley) 4/20/94
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* $Id: lfs_syscalls.c,v 1.12 1995/09/04 00:21:02 dyson Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <ufs/ufs/quota.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/lfs/lfs.h>
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#include <ufs/lfs/lfs_extern.h>
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#define BUMP_FIP(SP) \
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(SP)->fip = (FINFO *) (&(SP)->fip->fi_blocks[(SP)->fip->fi_nblocks])
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#define INC_FINFO(SP) ++((SEGSUM *)((SP)->segsum))->ss_nfinfo
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#define DEC_FINFO(SP) --((SEGSUM *)((SP)->segsum))->ss_nfinfo
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/*
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* Before committing to add something to a segment summary, make sure there
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* is enough room. S is the bytes added to the summary.
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*/
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#define CHECK_SEG(s) \
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if (sp->sum_bytes_left < (s)) { \
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(void) lfs_writeseg(fs, sp); \
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}
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struct buf *lfs_fakebuf __P((struct vnode *, int, size_t, caddr_t));
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int lfs_fastvget __P((struct mount *, ino_t, daddr_t, struct vnode **,
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struct dinode *));
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/*
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* lfs_markv:
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*
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* This will mark inodes and blocks dirty, so they are written into the log.
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* It will block until all the blocks have been written. The segment create
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* time passed in the block_info and inode_info structures is used to decide
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* if the data is valid for each block (in case some process dirtied a block
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* or inode that is being cleaned between the determination that a block is
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* live and the lfs_markv call).
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*
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* 0 on success
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* -1/errno is return on error.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct lfs_markv_args {
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fsid_t *fsidp; /* file system */
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BLOCK_INFO *blkiov; /* block array */
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int blkcnt; /* count of block array entries */
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};
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#endif
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int
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lfs_markv(p, uap, retval)
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struct proc *p;
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struct lfs_markv_args *uap;
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int *retval;
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{
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struct segment *sp;
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BLOCK_INFO *blkp;
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IFILE *ifp;
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struct buf *bp, **bpp;
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struct inode *ip = 0;
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struct lfs *fs;
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struct mount *mntp;
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struct vnode *vp;
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fsid_t fsid;
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void *start;
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ino_t lastino;
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daddr_t b_daddr, v_daddr;
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u_long bsize;
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int cnt, error;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return (error);
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if (error = copyin(uap->fsidp, &fsid, sizeof(fsid_t)))
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return (error);
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if ((mntp = getvfs(&fsid)) == NULL)
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return (EINVAL);
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cnt = uap->blkcnt;
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start = malloc(cnt * sizeof(BLOCK_INFO), M_SEGMENT, M_WAITOK);
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if (error = copyin(uap->blkiov, start, cnt * sizeof(BLOCK_INFO)))
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goto err1;
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/* Mark blocks/inodes dirty. */
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fs = VFSTOUFS(mntp)->um_lfs;
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bsize = fs->lfs_bsize;
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error = 0;
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lfs_seglock(fs, SEGM_SYNC | SEGM_CLEAN);
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sp = fs->lfs_sp;
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for (v_daddr = LFS_UNUSED_DADDR, lastino = LFS_UNUSED_INUM,
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blkp = start; cnt--; ++blkp) {
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/*
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* Get the IFILE entry (only once) and see if the file still
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* exists.
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*/
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if (lastino != blkp->bi_inode) {
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if (lastino != LFS_UNUSED_INUM) {
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/* Finish up last file */
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if (sp->fip->fi_nblocks == 0) {
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DEC_FINFO(sp);
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sp->sum_bytes_left +=
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sizeof(FINFO) - sizeof(daddr_t);
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} else {
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lfs_updatemeta(sp);
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BUMP_FIP(sp);
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}
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lfs_writeinode(fs, sp, ip);
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lfs_vunref(vp);
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}
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/* Start a new file */
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CHECK_SEG(sizeof(FINFO));
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sp->sum_bytes_left -= sizeof(FINFO) - sizeof(daddr_t);
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INC_FINFO(sp);
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sp->start_lbp = &sp->fip->fi_blocks[0];
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sp->vp = NULL;
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sp->fip->fi_version = blkp->bi_version;
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sp->fip->fi_nblocks = 0;
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sp->fip->fi_ino = blkp->bi_inode;
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lastino = blkp->bi_inode;
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if (blkp->bi_inode == LFS_IFILE_INUM)
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v_daddr = fs->lfs_idaddr;
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else {
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LFS_IENTRY(ifp, fs, blkp->bi_inode, bp);
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v_daddr = ifp->if_daddr;
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brelse(bp);
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}
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if (v_daddr == LFS_UNUSED_DADDR)
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continue;
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/* Get the vnode/inode. */
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if (lfs_fastvget(mntp, blkp->bi_inode, v_daddr, &vp,
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blkp->bi_lbn == LFS_UNUSED_LBN ?
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blkp->bi_bp : NULL)) {
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#ifdef DIAGNOSTIC
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printf("lfs_markv: VFS_VGET failed (%ld)\n",
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blkp->bi_inode);
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#endif
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lastino = LFS_UNUSED_INUM;
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v_daddr = LFS_UNUSED_DADDR;
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continue;
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}
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sp->vp = vp;
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ip = VTOI(vp);
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} else if (v_daddr == LFS_UNUSED_DADDR)
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continue;
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/* If this BLOCK_INFO didn't contain a block, keep going. */
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if (blkp->bi_lbn == LFS_UNUSED_LBN)
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continue;
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if (VOP_BMAP(vp, blkp->bi_lbn, NULL, &b_daddr, NULL, NULL) ||
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b_daddr != blkp->bi_daddr)
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continue;
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/*
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* If we got to here, then we are keeping the block. If it
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* is an indirect block, we want to actually put it in the
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* buffer cache so that it can be updated in the finish_meta
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* section. If it's not, we need to allocate a fake buffer
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* so that writeseg can perform the copyin and write the buffer.
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*/
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if (blkp->bi_lbn >= 0) /* Data Block */
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bp = lfs_fakebuf(vp, blkp->bi_lbn, bsize,
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blkp->bi_bp);
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else {
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bp = getblk(vp, blkp->bi_lbn, bsize, 0, 0);
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if (!(bp->b_flags & (B_DELWRI | B_DONE | B_CACHE)) &&
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(error = copyin(blkp->bi_bp, bp->b_data,
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bsize)))
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goto err2;
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if (error = VOP_BWRITE(bp))
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goto err2;
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}
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while (lfs_gatherblock(sp, bp, NULL));
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}
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if (sp->vp) {
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if (sp->fip->fi_nblocks == 0) {
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DEC_FINFO(sp);
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sp->sum_bytes_left +=
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sizeof(FINFO) - sizeof(daddr_t);
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} else
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lfs_updatemeta(sp);
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lfs_writeinode(fs, sp, ip);
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lfs_vunref(vp);
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}
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(void) lfs_writeseg(fs, sp);
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lfs_segunlock(fs);
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free(start, M_SEGMENT);
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return (error);
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/*
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* XXX
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* If we come in to error 2, we might have indirect blocks that were
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* updated and now have bad block pointers. I don't know what to do
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* about this.
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*/
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err2: lfs_vunref(vp);
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/* Free up fakebuffers */
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for (bpp = --sp->cbpp; bpp >= sp->bpp; --bpp)
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if ((*bpp)->b_flags & B_CALL) {
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relpbuf(*bpp);
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} else
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brelse(*bpp);
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lfs_segunlock(fs);
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err1:
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free(start, M_SEGMENT);
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return (error);
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}
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/*
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* lfs_bmapv:
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*
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* This will fill in the current disk address for arrays of blocks.
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*
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* 0 on success
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* -1/errno is return on error.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct lfs_bmapv_args {
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fsid_t *fsidp; /* file system */
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BLOCK_INFO *blkiov; /* block array */
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int blkcnt; /* count of block array entries */
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};
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#endif
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int
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lfs_bmapv(p, uap, retval)
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struct proc *p;
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struct lfs_bmapv_args *uap;
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int *retval;
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{
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BLOCK_INFO *blkp;
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struct mount *mntp;
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struct vnode *vp;
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fsid_t fsid;
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void *start;
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daddr_t daddr;
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int cnt, error, step;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return (error);
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if (error = copyin(uap->fsidp, &fsid, sizeof(fsid_t)))
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return (error);
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if ((mntp = getvfs(&fsid)) == NULL)
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return (EINVAL);
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cnt = uap->blkcnt;
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start = blkp = malloc(cnt * sizeof(BLOCK_INFO), M_SEGMENT, M_WAITOK);
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if (error = copyin(uap->blkiov, blkp, cnt * sizeof(BLOCK_INFO))) {
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free(blkp, M_SEGMENT);
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return (error);
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}
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for (step = cnt; step--; ++blkp) {
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if (blkp->bi_lbn == LFS_UNUSED_LBN)
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continue;
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/* Could be a deadlock ? */
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if (VFS_VGET(mntp, blkp->bi_inode, &vp))
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daddr = LFS_UNUSED_DADDR;
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else {
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if (VOP_BMAP(vp, blkp->bi_lbn, NULL, &daddr, NULL, NULL))
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daddr = LFS_UNUSED_DADDR;
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vput(vp);
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}
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blkp->bi_daddr = daddr;
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}
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copyout(start, uap->blkiov, cnt * sizeof(BLOCK_INFO));
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free(start, M_SEGMENT);
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return (0);
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}
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/*
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* lfs_segclean:
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*
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* Mark the segment clean.
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*
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* 0 on success
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* -1/errno is return on error.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct lfs_segclean_args {
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fsid_t *fsidp; /* file system */
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u_long segment; /* segment number */
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};
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#endif
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int
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lfs_segclean(p, uap, retval)
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struct proc *p;
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struct lfs_segclean_args *uap;
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int *retval;
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{
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CLEANERINFO *cip;
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SEGUSE *sup;
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struct buf *bp;
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struct mount *mntp;
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struct lfs *fs;
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fsid_t fsid;
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int error;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return (error);
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if (error = copyin(uap->fsidp, &fsid, sizeof(fsid_t)))
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return (error);
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if ((mntp = getvfs(&fsid)) == NULL)
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return (EINVAL);
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fs = VFSTOUFS(mntp)->um_lfs;
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if (datosn(fs, fs->lfs_curseg) == uap->segment)
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return (EBUSY);
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LFS_SEGENTRY(sup, fs, uap->segment, bp);
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if (sup->su_flags & SEGUSE_ACTIVE) {
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brelse(bp);
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return (EBUSY);
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}
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fs->lfs_avail += fsbtodb(fs, fs->lfs_ssize) - 1;
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fs->lfs_bfree += (sup->su_nsums * LFS_SUMMARY_SIZE / DEV_BSIZE) +
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sup->su_ninos * btodb(fs->lfs_bsize);
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sup->su_flags &= ~SEGUSE_DIRTY;
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(void) VOP_BWRITE(bp);
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LFS_CLEANERINFO(cip, fs, bp);
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++cip->clean;
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--cip->dirty;
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(void) VOP_BWRITE(bp);
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wakeup(&fs->lfs_avail);
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return (0);
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}
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/*
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* lfs_segwait:
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*
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* This will block until a segment in file system fsid is written. A timeout
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* in milliseconds may be specified which will awake the cleaner automatically.
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* An fsid of -1 means any file system, and a timeout of 0 means forever.
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*
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* 0 on success
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* 1 on timeout
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* -1/errno is return on error.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct lfs_segwait_args {
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fsid_t *fsidp; /* file system */
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struct timeval *tv; /* timeout */
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};
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#endif
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int
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lfs_segwait(p, uap, retval)
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struct proc *p;
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struct lfs_segwait_args *uap;
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int *retval;
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{
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struct mount *mntp;
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struct timeval atv;
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fsid_t fsid;
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void *addr;
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u_long timeout;
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int error, s;
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if (error = suser(p->p_ucred, &p->p_acflag)) {
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return (error);
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}
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#ifdef WHEN_QUADS_WORK
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if (error = copyin(uap->fsidp, &fsid, sizeof(fsid_t)))
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return (error);
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if (fsid == (fsid_t)-1)
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addr = &lfs_allclean_wakeup;
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else {
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if ((mntp = getvfs(&fsid)) == NULL)
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return (EINVAL);
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addr = &VFSTOUFS(mntp)->um_lfs->lfs_nextseg;
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}
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#else
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if (error = copyin(uap->fsidp, &fsid, sizeof(fsid_t)))
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return (error);
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if ((mntp = getvfs(&fsid)) == NULL)
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addr = &lfs_allclean_wakeup;
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else
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addr = &VFSTOUFS(mntp)->um_lfs->lfs_nextseg;
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#endif
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if (uap->tv) {
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if (error = copyin(uap->tv, &atv, sizeof(struct timeval)))
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return (error);
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if (itimerfix(&atv))
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return (EINVAL);
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s = splclock();
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timevaladd(&atv, (struct timeval *)&time);
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timeout = hzto(&atv);
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splx(s);
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} else
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timeout = 0;
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error = tsleep(addr, PCATCH | PUSER, "segment", timeout);
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return (error == ERESTART ? EINTR : 0);
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}
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/*
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* VFS_VGET call specialized for the cleaner. The cleaner already knows the
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* daddr from the ifile, so don't look it up again. If the cleaner is
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* processing IINFO structures, it may have the ondisk inode already, so
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* don't go retrieving it again.
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*/
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int
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lfs_fastvget(mp, ino, daddr, vpp, dinp)
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struct mount *mp;
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ino_t ino;
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daddr_t daddr;
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struct vnode **vpp;
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struct dinode *dinp;
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{
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register struct inode *ip;
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struct vnode *vp;
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struct ufsmount *ump;
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struct buf *bp;
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dev_t dev;
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int error;
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ump = VFSTOUFS(mp);
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dev = ump->um_dev;
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/*
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* This is playing fast and loose. Someone may have the inode
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* locked, in which case they are going to be distinctly unhappy
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* if we trash something.
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*/
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if ((*vpp = ufs_ihashlookup(dev, ino)) != NULL) {
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lfs_vref(*vpp);
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if ((*vpp)->v_flag & VXLOCK)
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printf ("Cleaned vnode VXLOCKED\n");
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ip = VTOI(*vpp);
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if (ip->i_flags & IN_LOCKED)
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printf("cleaned vnode locked\n");
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if (!(ip->i_flag & IN_MODIFIED)) {
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++ump->um_lfs->lfs_uinodes;
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|
ip->i_flag |= IN_MODIFIED;
|
|
}
|
|
ip->i_flag |= IN_MODIFIED; /* XXX why is this here? it's redundant */
|
|
return (0);
|
|
}
|
|
|
|
/* Allocate new vnode/inode. */
|
|
if (error = lfs_vcreate(mp, ino, &vp)) {
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Put it onto its hash chain and lock it so that other requests for
|
|
* this inode will block if they arrive while we are sleeping waiting
|
|
* for old data structures to be purged or for the contents of the
|
|
* disk portion of this inode to be read.
|
|
*/
|
|
ip = VTOI(vp);
|
|
ufs_ihashins(ip);
|
|
|
|
/*
|
|
* XXX
|
|
* This may not need to be here, logically it should go down with
|
|
* the i_devvp initialization.
|
|
* Ask Kirk.
|
|
*/
|
|
ip->i_lfs = ump->um_lfs;
|
|
|
|
/* Read in the disk contents for the inode, copy into the inode. */
|
|
if (dinp)
|
|
if (error = copyin(dinp, &ip->i_din, sizeof(struct dinode)))
|
|
return (error);
|
|
else {
|
|
if (error = bread(ump->um_devvp, daddr,
|
|
(int)ump->um_lfs->lfs_bsize, NOCRED, &bp)) {
|
|
/*
|
|
* The inode does not contain anything useful, so it
|
|
* would be misleading to leave it on its hash chain.
|
|
* Iput() will return it to the free list.
|
|
*/
|
|
ufs_ihashrem(ip);
|
|
|
|
/* Unlock and discard unneeded inode. */
|
|
lfs_vunref(vp);
|
|
brelse(bp);
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
ip->i_din =
|
|
*lfs_ifind(ump->um_lfs, ino, (struct dinode *)bp->b_data);
|
|
brelse(bp);
|
|
}
|
|
|
|
/* Inode was just read from user space or disk, make sure it's locked */
|
|
ip->i_flag |= IN_LOCKED;
|
|
ip->i_lockholder = curproc->p_pid;
|
|
ip->i_lockcount = 1;
|
|
|
|
/*
|
|
* Initialize the vnode from the inode, check for aliases. In all
|
|
* cases re-init ip, the underlying vnode/inode may have changed.
|
|
*/
|
|
if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) {
|
|
lfs_vunref(vp);
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
/*
|
|
* Finish inode initialization now that aliasing has been resolved.
|
|
*/
|
|
ip->i_devvp = ump->um_devvp;
|
|
ip->i_flag |= IN_MODIFIED;
|
|
++ump->um_lfs->lfs_uinodes;
|
|
VREF(ip->i_devvp);
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
struct buf *
|
|
lfs_fakebuf(vp, lbn, size, uaddr)
|
|
struct vnode *vp;
|
|
int lbn;
|
|
size_t size;
|
|
caddr_t uaddr;
|
|
{
|
|
struct buf *bp;
|
|
|
|
bp = lfs_newbuf(vp, lbn, 0);
|
|
bp->b_saveaddr = uaddr;
|
|
bp->b_bufsize = size;
|
|
bp->b_bcount = size;
|
|
bp->b_flags |= B_INVAL;
|
|
return (bp);
|
|
}
|
|
|
|
|