f9ea5f696e
that are committed to being freed and reflect these blocks in the counts returned by statfs (and thus also by the `df' command). This change allows programs such as those that do news expiration to know when to stop if they are trying to create a certain percentage of free space. Note that this change does not solve the much harder problem of making this to-be-freed space available to applications that want it (thus on a nearly full filesystem, you may still encounter out-of-space conditions even though the free space will show up eventually). Hopefully this harder problem will be the subject of a future enhancement.
531 lines
15 KiB
C
531 lines
15 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
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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
|
|
* 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
|
|
* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
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* 3. All advertising materials mentioning features or use of this software
|
|
* 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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|
* 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
|
|
* 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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* @(#)ffs_inode.c 8.13 (Berkeley) 4/21/95
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* $FreeBSD$
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*/
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|
|
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#include "opt_quota.h"
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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/mount.h>
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#include <sys/proc.h>
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|
#include <sys/bio.h>
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|
#include <sys/buf.h>
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|
#include <sys/vnode.h>
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|
#include <sys/malloc.h>
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|
#include <sys/resourcevar.h>
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|
#include <sys/vmmeter.h>
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#include <sys/stat.h>
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|
|
|
#include <vm/vm.h>
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|
#include <vm/vm_extern.h>
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|
|
|
#include <ufs/ufs/extattr.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/ufsmount.h>
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|
#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufs_extern.h>
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|
|
|
#include <ufs/ffs/fs.h>
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|
#include <ufs/ffs/ffs_extern.h>
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|
|
|
static int ffs_indirtrunc __P((struct inode *, ufs_daddr_t, ufs_daddr_t,
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|
ufs_daddr_t, int, long *));
|
|
|
|
/*
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|
* Update the access, modified, and inode change times as specified by the
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* IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
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* to disk if the IN_MODIFIED flag is set (it may be set initially, or by
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* the timestamp update). The IN_LAZYMOD flag is set to force a write
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* later if not now. If we write now, then clear both IN_MODIFIED and
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* IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
|
|
* set, then wait for the write to complete.
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|
*/
|
|
int
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|
ffs_update(vp, waitfor)
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|
struct vnode *vp;
|
|
int waitfor;
|
|
{
|
|
register struct fs *fs;
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|
struct buf *bp;
|
|
struct inode *ip;
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|
int error;
|
|
|
|
ufs_itimes(vp);
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|
ip = VTOI(vp);
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if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
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return (0);
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|
ip->i_flag &= ~(IN_LAZYMOD | IN_MODIFIED);
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|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
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|
return (0);
|
|
fs = ip->i_fs;
|
|
/*
|
|
* Ensure that uid and gid are correct. This is a temporary
|
|
* fix until fsck has been changed to do the update.
|
|
*/
|
|
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
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|
ip->i_din.di_ouid = ip->i_uid; /* XXX */
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|
ip->i_din.di_ogid = ip->i_gid; /* XXX */
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|
} /* XXX */
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|
error = bread(ip->i_devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
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(int)fs->fs_bsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
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|
return (error);
|
|
}
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|
if (DOINGSOFTDEP(vp))
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|
softdep_update_inodeblock(ip, bp, waitfor);
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|
else if (ip->i_effnlink != ip->i_nlink)
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|
panic("ffs_update: bad link cnt");
|
|
*((struct dinode *)bp->b_data +
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|
ino_to_fsbo(fs, ip->i_number)) = ip->i_din;
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|
if (waitfor && !DOINGASYNC(vp)) {
|
|
return (bwrite(bp));
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|
} else if (vm_page_count_severe() || buf_dirty_count_severe()) {
|
|
return (bwrite(bp));
|
|
} else {
|
|
if (bp->b_bufsize == fs->fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
bdwrite(bp);
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|
return (0);
|
|
}
|
|
}
|
|
|
|
#define SINGLE 0 /* index of single indirect block */
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|
#define DOUBLE 1 /* index of double indirect block */
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|
#define TRIPLE 2 /* index of triple indirect block */
|
|
/*
|
|
* Truncate the inode oip to at most length size, freeing the
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|
* disk blocks.
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|
*/
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|
int
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|
ffs_truncate(vp, length, flags, cred, p)
|
|
struct vnode *vp;
|
|
off_t length;
|
|
int flags;
|
|
struct ucred *cred;
|
|
struct proc *p;
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|
{
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|
register struct vnode *ovp = vp;
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|
ufs_daddr_t lastblock;
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|
register struct inode *oip;
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|
ufs_daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
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|
ufs_daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
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|
register struct fs *fs;
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|
struct buf *bp;
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|
int offset, size, level;
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|
long count, nblocks, blocksreleased = 0;
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|
register int i;
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|
int aflags, error, allerror;
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|
off_t osize;
|
|
|
|
oip = VTOI(ovp);
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|
fs = oip->i_fs;
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|
if (length < 0)
|
|
return (EINVAL);
|
|
if (length > fs->fs_maxfilesize)
|
|
return (EFBIG);
|
|
if (ovp->v_type == VLNK &&
|
|
(oip->i_size < ovp->v_mount->mnt_maxsymlinklen || oip->i_din.di_blocks == 0)) {
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|
#ifdef DIAGNOSTIC
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|
if (length != 0)
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|
panic("ffs_truncate: partial truncate of symlink");
|
|
#endif
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|
bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
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|
oip->i_size = 0;
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|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
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|
return (UFS_UPDATE(ovp, 1));
|
|
}
|
|
if (oip->i_size == length) {
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|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
return (UFS_UPDATE(ovp, 0));
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|
}
|
|
#ifdef QUOTA
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|
error = getinoquota(oip);
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|
if (error)
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|
return (error);
|
|
#endif
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|
if ((oip->i_flags & SF_SNAPSHOT) != 0)
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|
ffs_snapremove(ovp);
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|
ovp->v_lasta = ovp->v_clen = ovp->v_cstart = ovp->v_lastw = 0;
|
|
if (DOINGSOFTDEP(ovp)) {
|
|
if (length > 0 || softdep_slowdown(ovp)) {
|
|
/*
|
|
* If a file is only partially truncated, then
|
|
* we have to clean up the data structures
|
|
* describing the allocation past the truncation
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|
* point. Finding and deallocating those structures
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|
* is a lot of work. Since partial truncation occurs
|
|
* rarely, we solve the problem by syncing the file
|
|
* so that it will have no data structures left.
|
|
*/
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|
if ((error = VOP_FSYNC(ovp, cred, MNT_WAIT,
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|
p)) != 0)
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|
return (error);
|
|
if (oip->i_flag & IN_SPACECOUNTED)
|
|
fs->fs_pendingblocks -= oip->i_blocks;
|
|
} else {
|
|
#ifdef QUOTA
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|
(void) chkdq(oip, -oip->i_blocks, NOCRED, 0);
|
|
#endif
|
|
softdep_setup_freeblocks(oip, length);
|
|
vinvalbuf(ovp, 0, cred, p, 0, 0);
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|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
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return (ffs_update(ovp, 0));
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|
}
|
|
}
|
|
osize = oip->i_size;
|
|
/*
|
|
* Lengthen the size of the file. We must ensure that the
|
|
* last byte of the file is allocated. Since the smallest
|
|
* value of osize is 0, length will be at least 1.
|
|
*/
|
|
if (osize < length) {
|
|
vnode_pager_setsize(ovp, length);
|
|
aflags = B_CLRBUF;
|
|
if (flags & IO_SYNC)
|
|
aflags |= B_SYNC;
|
|
error = UFS_BALLOC(ovp, length - 1, 1,
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|
cred, aflags, &bp);
|
|
if (error)
|
|
return (error);
|
|
oip->i_size = length;
|
|
if (bp->b_bufsize == fs->fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
if (aflags & B_SYNC)
|
|
bwrite(bp);
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|
else
|
|
bawrite(bp);
|
|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
return (UFS_UPDATE(ovp, 1));
|
|
}
|
|
/*
|
|
* Shorten the size of the file. If the file is not being
|
|
* truncated to a block boundary, the contents of the
|
|
* partial block following the end of the file must be
|
|
* zero'ed in case it ever becomes accessible again because
|
|
* of subsequent file growth. Directories however are not
|
|
* zero'ed as they should grow back initialized to empty.
|
|
*/
|
|
offset = blkoff(fs, length);
|
|
if (offset == 0) {
|
|
oip->i_size = length;
|
|
} else {
|
|
lbn = lblkno(fs, length);
|
|
aflags = B_CLRBUF;
|
|
if (flags & IO_SYNC)
|
|
aflags |= B_SYNC;
|
|
error = UFS_BALLOC(ovp, length - 1, 1, cred, aflags, &bp);
|
|
if (error) {
|
|
return (error);
|
|
}
|
|
oip->i_size = length;
|
|
size = blksize(fs, oip, lbn);
|
|
if (ovp->v_type != VDIR)
|
|
bzero((char *)bp->b_data + offset,
|
|
(u_int)(size - offset));
|
|
/* Kirk's code has reallocbuf(bp, size, 1) here */
|
|
allocbuf(bp, size);
|
|
if (bp->b_bufsize == fs->fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
if (aflags & B_SYNC)
|
|
bwrite(bp);
|
|
else
|
|
bawrite(bp);
|
|
}
|
|
/*
|
|
* Calculate index into inode's block list of
|
|
* last direct and indirect blocks (if any)
|
|
* which we want to keep. Lastblock is -1 when
|
|
* the file is truncated to 0.
|
|
*/
|
|
lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1;
|
|
lastiblock[SINGLE] = lastblock - NDADDR;
|
|
lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
|
|
lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
|
|
nblocks = btodb(fs->fs_bsize);
|
|
/*
|
|
* Update file and block pointers on disk before we start freeing
|
|
* blocks. If we crash before free'ing blocks below, the blocks
|
|
* will be returned to the free list. lastiblock values are also
|
|
* normalized to -1 for calls to ffs_indirtrunc below.
|
|
*/
|
|
bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks);
|
|
for (level = TRIPLE; level >= SINGLE; level--)
|
|
if (lastiblock[level] < 0) {
|
|
oip->i_ib[level] = 0;
|
|
lastiblock[level] = -1;
|
|
}
|
|
for (i = NDADDR - 1; i > lastblock; i--)
|
|
oip->i_db[i] = 0;
|
|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
allerror = UFS_UPDATE(ovp, 1);
|
|
|
|
/*
|
|
* Having written the new inode to disk, save its new configuration
|
|
* and put back the old block pointers long enough to process them.
|
|
* Note that we save the new block configuration so we can check it
|
|
* when we are done.
|
|
*/
|
|
bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks);
|
|
bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks);
|
|
oip->i_size = osize;
|
|
|
|
error = vtruncbuf(ovp, cred, p, length, fs->fs_bsize);
|
|
if (error && (allerror == 0))
|
|
allerror = error;
|
|
|
|
/*
|
|
* Indirect blocks first.
|
|
*/
|
|
indir_lbn[SINGLE] = -NDADDR;
|
|
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
|
|
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
|
|
for (level = TRIPLE; level >= SINGLE; level--) {
|
|
bn = oip->i_ib[level];
|
|
if (bn != 0) {
|
|
error = ffs_indirtrunc(oip, indir_lbn[level],
|
|
fsbtodb(fs, bn), lastiblock[level], level, &count);
|
|
if (error)
|
|
allerror = error;
|
|
blocksreleased += count;
|
|
if (lastiblock[level] < 0) {
|
|
oip->i_ib[level] = 0;
|
|
ffs_blkfree(oip, bn, fs->fs_bsize);
|
|
blocksreleased += nblocks;
|
|
}
|
|
}
|
|
if (lastiblock[level] >= 0)
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* All whole direct blocks or frags.
|
|
*/
|
|
for (i = NDADDR - 1; i > lastblock; i--) {
|
|
register long bsize;
|
|
|
|
bn = oip->i_db[i];
|
|
if (bn == 0)
|
|
continue;
|
|
oip->i_db[i] = 0;
|
|
bsize = blksize(fs, oip, i);
|
|
ffs_blkfree(oip, bn, bsize);
|
|
blocksreleased += btodb(bsize);
|
|
}
|
|
if (lastblock < 0)
|
|
goto done;
|
|
|
|
/*
|
|
* Finally, look for a change in size of the
|
|
* last direct block; release any frags.
|
|
*/
|
|
bn = oip->i_db[lastblock];
|
|
if (bn != 0) {
|
|
long oldspace, newspace;
|
|
|
|
/*
|
|
* Calculate amount of space we're giving
|
|
* back as old block size minus new block size.
|
|
*/
|
|
oldspace = blksize(fs, oip, lastblock);
|
|
oip->i_size = length;
|
|
newspace = blksize(fs, oip, lastblock);
|
|
if (newspace == 0)
|
|
panic("ffs_truncate: newspace");
|
|
if (oldspace - newspace > 0) {
|
|
/*
|
|
* Block number of space to be free'd is
|
|
* the old block # plus the number of frags
|
|
* required for the storage we're keeping.
|
|
*/
|
|
bn += numfrags(fs, newspace);
|
|
ffs_blkfree(oip, bn, oldspace - newspace);
|
|
blocksreleased += btodb(oldspace - newspace);
|
|
}
|
|
}
|
|
done:
|
|
#ifdef DIAGNOSTIC
|
|
for (level = SINGLE; level <= TRIPLE; level++)
|
|
if (newblks[NDADDR + level] != oip->i_ib[level])
|
|
panic("ffs_truncate1");
|
|
for (i = 0; i < NDADDR; i++)
|
|
if (newblks[i] != oip->i_db[i])
|
|
panic("ffs_truncate2");
|
|
if (length == 0 &&
|
|
(!TAILQ_EMPTY(&ovp->v_dirtyblkhd) ||
|
|
!TAILQ_EMPTY(&ovp->v_cleanblkhd)))
|
|
panic("ffs_truncate3");
|
|
#endif /* DIAGNOSTIC */
|
|
/*
|
|
* Put back the real size.
|
|
*/
|
|
oip->i_size = length;
|
|
oip->i_blocks -= blocksreleased;
|
|
|
|
if (oip->i_blocks < 0) /* sanity */
|
|
oip->i_blocks = 0;
|
|
oip->i_flag |= IN_CHANGE;
|
|
#ifdef QUOTA
|
|
(void) chkdq(oip, -blocksreleased, NOCRED, 0);
|
|
#endif
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* Release blocks associated with the inode ip and stored in the indirect
|
|
* block bn. Blocks are free'd in LIFO order up to (but not including)
|
|
* lastbn. If level is greater than SINGLE, the block is an indirect block
|
|
* and recursive calls to indirtrunc must be used to cleanse other indirect
|
|
* blocks.
|
|
*
|
|
* NB: triple indirect blocks are untested.
|
|
*/
|
|
static int
|
|
ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp)
|
|
register struct inode *ip;
|
|
ufs_daddr_t lbn, lastbn;
|
|
ufs_daddr_t dbn;
|
|
int level;
|
|
long *countp;
|
|
{
|
|
register int i;
|
|
struct buf *bp;
|
|
register struct fs *fs = ip->i_fs;
|
|
register ufs_daddr_t *bap;
|
|
struct vnode *vp;
|
|
ufs_daddr_t *copy = NULL, nb, nlbn, last;
|
|
long blkcount, factor;
|
|
int nblocks, blocksreleased = 0;
|
|
int error = 0, allerror = 0;
|
|
|
|
/*
|
|
* Calculate index in current block of last
|
|
* block to be kept. -1 indicates the entire
|
|
* block so we need not calculate the index.
|
|
*/
|
|
factor = 1;
|
|
for (i = SINGLE; i < level; i++)
|
|
factor *= NINDIR(fs);
|
|
last = lastbn;
|
|
if (lastbn > 0)
|
|
last /= factor;
|
|
nblocks = btodb(fs->fs_bsize);
|
|
/*
|
|
* Get buffer of block pointers, zero those entries corresponding
|
|
* to blocks to be free'd, and update on disk copy first. Since
|
|
* double(triple) indirect before single(double) indirect, calls
|
|
* to bmap on these blocks will fail. However, we already have
|
|
* the on disk address, so we have to set the b_blkno field
|
|
* explicitly instead of letting bread do everything for us.
|
|
*/
|
|
vp = ITOV(ip);
|
|
bp = getblk(vp, lbn, (int)fs->fs_bsize, 0, 0);
|
|
if ((bp->b_flags & B_CACHE) == 0) {
|
|
curproc->p_stats->p_ru.ru_inblock++; /* pay for read */
|
|
bp->b_iocmd = BIO_READ;
|
|
bp->b_flags &= ~B_INVAL;
|
|
bp->b_ioflags &= ~BIO_ERROR;
|
|
if (bp->b_bcount > bp->b_bufsize)
|
|
panic("ffs_indirtrunc: bad buffer size");
|
|
bp->b_blkno = dbn;
|
|
vfs_busy_pages(bp, 0);
|
|
BUF_STRATEGY(bp);
|
|
error = bufwait(bp);
|
|
}
|
|
if (error) {
|
|
brelse(bp);
|
|
*countp = 0;
|
|
return (error);
|
|
}
|
|
|
|
bap = (ufs_daddr_t *)bp->b_data;
|
|
if (lastbn != -1) {
|
|
MALLOC(copy, ufs_daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK);
|
|
bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize);
|
|
bzero((caddr_t)&bap[last + 1],
|
|
(u_int)(NINDIR(fs) - (last + 1)) * sizeof (ufs_daddr_t));
|
|
if (DOINGASYNC(vp)) {
|
|
bawrite(bp);
|
|
} else {
|
|
error = bwrite(bp);
|
|
if (error)
|
|
allerror = error;
|
|
}
|
|
bap = copy;
|
|
}
|
|
|
|
/*
|
|
* Recursively free totally unused blocks.
|
|
*/
|
|
for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
|
|
i--, nlbn += factor) {
|
|
nb = bap[i];
|
|
if (nb == 0)
|
|
continue;
|
|
if (level > SINGLE) {
|
|
if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
(ufs_daddr_t)-1, level - 1, &blkcount)) != 0)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
ffs_blkfree(ip, nb, fs->fs_bsize);
|
|
blocksreleased += nblocks;
|
|
}
|
|
|
|
/*
|
|
* Recursively free last partial block.
|
|
*/
|
|
if (level > SINGLE && lastbn >= 0) {
|
|
last = lastbn % factor;
|
|
nb = bap[i];
|
|
if (nb != 0) {
|
|
error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
last, level - 1, &blkcount);
|
|
if (error)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
}
|
|
if (copy != NULL) {
|
|
FREE(copy, M_TEMP);
|
|
} else {
|
|
bp->b_flags |= B_INVAL | B_NOCACHE;
|
|
brelse(bp);
|
|
}
|
|
|
|
*countp = blocksreleased;
|
|
return (allerror);
|
|
}
|