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09dbf7a214
freebsd/sys/ufs/ffs/ffs_alloc.c
Don Lewis 9f206707a5 Tweak the calculation of minbfree in ffs_dirpref() so that only 
those cylinder groups that have at least 75% of the average free
space per cylinder group for that file system are considered as
candidates for the creation of a new directory.  The previous formula
for minbfree would set it to zero if the file system was more than
75% full, which allowed cylinder groups with no free space at all
to be chosen as candidates for directory creation, which resulted
in an expensive search for free blocks for each file that was
subsequently created in that directory.

Modify the calculation of minifree in the same way.

Decrease maxcontigdirs as the file system fills to decrease the
likelyhood that a cluster of directories will overflow the available
space in a cylinder group.

Reviewed by:	mckusick
Tested by:	kmarx@vicor.com
MFC after:	2 weeks
2003-10-31 07:25:06 +00:00

2363 lines
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/*
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Marshall
* Kirk McKusick and Network Associates Laboratories, the Security
* Research Division of Network Associates, Inc. under DARPA/SPAWAR
* contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
* research program
*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ffs_alloc.c 8.18 (Berkeley) 5/26/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_quota.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
typedef ufs2_daddr_t allocfcn_t(struct inode *ip, int cg, ufs2_daddr_t bpref,
int size);
static ufs2_daddr_t ffs_alloccg(struct inode *, int, ufs2_daddr_t, int);
static ufs2_daddr_t
ffs_alloccgblk(struct inode *, struct buf *, ufs2_daddr_t);
#ifdef DIAGNOSTIC
static int ffs_checkblk(struct inode *, ufs2_daddr_t, long);
#endif
static ufs2_daddr_t ffs_clusteralloc(struct inode *, int, ufs2_daddr_t, int);
static ino_t ffs_dirpref(struct inode *);
static ufs2_daddr_t ffs_fragextend(struct inode *, int, ufs2_daddr_t, int, int);
static void ffs_fserr(struct fs *, ino_t, char *);
static ufs2_daddr_t ffs_hashalloc
(struct inode *, int, ufs2_daddr_t, int, allocfcn_t *);
static ufs2_daddr_t ffs_nodealloccg(struct inode *, int, ufs2_daddr_t, int);
static ufs1_daddr_t ffs_mapsearch(struct fs *, struct cg *, ufs2_daddr_t, int);
static int ffs_reallocblks_ufs1(struct vop_reallocblks_args *);
static int ffs_reallocblks_ufs2(struct vop_reallocblks_args *);
/*
* Allocate a block in the filesystem.
*
* The size of the requested block is given, which must be some
* multiple of fs_fsize and <= fs_bsize.
* A preference may be optionally specified. If a preference is given
* the following hierarchy is used to allocate a block:
* 1) allocate the requested block.
* 2) allocate a rotationally optimal block in the same cylinder.
* 3) allocate a block in the same cylinder group.
* 4) quadradically rehash into other cylinder groups, until an
* available block is located.
* If no block preference is given the following heirarchy is used
* to allocate a block:
* 1) allocate a block in the cylinder group that contains the
* inode for the file.
* 2) quadradically rehash into other cylinder groups, until an
* available block is located.
*/
int
ffs_alloc(ip, lbn, bpref, size, cred, bnp)
struct inode *ip;
ufs2_daddr_t lbn, bpref;
int size;
struct ucred *cred;
ufs2_daddr_t *bnp;
{
struct fs *fs;
ufs2_daddr_t bno;
int cg, reclaimed;
#ifdef QUOTA
int error;
#endif
*bnp = 0;
fs = ip->i_fs;
#ifdef DIAGNOSTIC
if ((u_int)size > fs->fs_bsize || fragoff(fs, size) != 0) {
printf("dev = %s, bsize = %ld, size = %d, fs = %s\n",
devtoname(ip->i_dev), (long)fs->fs_bsize, size,
fs->fs_fsmnt);
panic("ffs_alloc: bad size");
}
if (cred == NOCRED)
panic("ffs_alloc: missing credential");
#endif /* DIAGNOSTIC */
reclaimed = 0;
retry:
if (size == fs->fs_bsize && fs->fs_cstotal.cs_nbfree == 0)
goto nospace;
if (suser_cred(cred, PRISON_ROOT) &&
freespace(fs, fs->fs_minfree) - numfrags(fs, size) < 0)
goto nospace;
#ifdef QUOTA
error = chkdq(ip, btodb(size), cred, 0);
if (error)
return (error);
#endif
if (bpref >= fs->fs_size)
bpref = 0;
if (bpref == 0)
cg = ino_to_cg(fs, ip->i_number);
else
cg = dtog(fs, bpref);
bno = ffs_hashalloc(ip, cg, bpref, size, ffs_alloccg);
if (bno > 0) {
DIP(ip, i_blocks) += btodb(size);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
*bnp = bno;
return (0);
}
#ifdef QUOTA
/*
* Restore user's disk quota because allocation failed.
*/
(void) chkdq(ip, -btodb(size), cred, FORCE);
#endif
nospace:
if (fs->fs_pendingblocks > 0 && reclaimed == 0) {
reclaimed = 1;
softdep_request_cleanup(fs, ITOV(ip));
goto retry;
}
ffs_fserr(fs, ip->i_number, "filesystem full");
uprintf("\n%s: write failed, filesystem is full\n", fs->fs_fsmnt);
return (ENOSPC);
}
/*
* Reallocate a fragment to a bigger size
*
* The number and size of the old block is given, and a preference
* and new size is also specified. The allocator attempts to extend
* the original block. Failing that, the regular block allocator is
* invoked to get an appropriate block.
*/
int
ffs_realloccg(ip, lbprev, bprev, bpref, osize, nsize, cred, bpp)
struct inode *ip;
ufs2_daddr_t lbprev;
ufs2_daddr_t bprev;
ufs2_daddr_t bpref;
int osize, nsize;
struct ucred *cred;
struct buf **bpp;
{
struct vnode *vp;
struct fs *fs;
struct buf *bp;
int cg, request, error, reclaimed;
ufs2_daddr_t bno;
*bpp = 0;
vp = ITOV(ip);
fs = ip->i_fs;
#ifdef DIAGNOSTIC
if (vp->v_mount->mnt_kern_flag & MNTK_SUSPENDED)
panic("ffs_realloccg: allocation on suspended filesystem");
if ((u_int)osize > fs->fs_bsize || fragoff(fs, osize) != 0 ||
(u_int)nsize > fs->fs_bsize || fragoff(fs, nsize) != 0) {
printf(
"dev = %s, bsize = %ld, osize = %d, nsize = %d, fs = %s\n",
devtoname(ip->i_dev), (long)fs->fs_bsize, osize,
nsize, fs->fs_fsmnt);
panic("ffs_realloccg: bad size");
}
if (cred == NOCRED)
panic("ffs_realloccg: missing credential");
#endif /* DIAGNOSTIC */
reclaimed = 0;
retry:
if (suser_cred(cred, PRISON_ROOT) &&
freespace(fs, fs->fs_minfree) - numfrags(fs, nsize - osize) < 0)
goto nospace;
if (bprev == 0) {
printf("dev = %s, bsize = %ld, bprev = %jd, fs = %s\n",
devtoname(ip->i_dev), (long)fs->fs_bsize, (intmax_t)bprev,
fs->fs_fsmnt);
panic("ffs_realloccg: bad bprev");
}
/*
* Allocate the extra space in the buffer.
*/
error = bread(vp, lbprev, osize, NOCRED, &bp);
if (error) {
brelse(bp);
return (error);
}
if (bp->b_blkno == bp->b_lblkno) {
if (lbprev >= NDADDR)
panic("ffs_realloccg: lbprev out of range");
bp->b_blkno = fsbtodb(fs, bprev);
}
#ifdef QUOTA
error = chkdq(ip, btodb(nsize - osize), cred, 0);
if (error) {
brelse(bp);
return (error);
}
#endif
/*
* Check for extension in the existing location.
*/
cg = dtog(fs, bprev);
bno = ffs_fragextend(ip, cg, bprev, osize, nsize);
if (bno) {
if (bp->b_blkno != fsbtodb(fs, bno))
panic("ffs_realloccg: bad blockno");
DIP(ip, i_blocks) += btodb(nsize - osize);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
allocbuf(bp, nsize);
bp->b_flags |= B_DONE;
bzero((char *)bp->b_data + osize, (u_int)nsize - osize);
*bpp = bp;
return (0);
}
/*
* Allocate a new disk location.
*/
if (bpref >= fs->fs_size)
bpref = 0;
switch ((int)fs->fs_optim) {
case FS_OPTSPACE:
/*
* Allocate an exact sized fragment. Although this makes
* best use of space, we will waste time relocating it if
* the file continues to grow. If the fragmentation is
* less than half of the minimum free reserve, we choose
* to begin optimizing for time.
*/
request = nsize;
if (fs->fs_minfree <= 5 ||
fs->fs_cstotal.cs_nffree >
(off_t)fs->fs_dsize * fs->fs_minfree / (2 * 100))
break;
log(LOG_NOTICE, "%s: optimization changed from SPACE to TIME\n",
fs->fs_fsmnt);
fs->fs_optim = FS_OPTTIME;
break;
case FS_OPTTIME:
/*
* At this point we have discovered a file that is trying to
* grow a small fragment to a larger fragment. To save time,
* we allocate a full sized block, then free the unused portion.
* If the file continues to grow, the `ffs_fragextend' call
* above will be able to grow it in place without further
* copying. If aberrant programs cause disk fragmentation to
* grow within 2% of the free reserve, we choose to begin
* optimizing for space.
*/
request = fs->fs_bsize;
if (fs->fs_cstotal.cs_nffree <
(off_t)fs->fs_dsize * (fs->fs_minfree - 2) / 100)
break;
log(LOG_NOTICE, "%s: optimization changed from TIME to SPACE\n",
fs->fs_fsmnt);
fs->fs_optim = FS_OPTSPACE;
break;
default:
printf("dev = %s, optim = %ld, fs = %s\n",
devtoname(ip->i_dev), (long)fs->fs_optim, fs->fs_fsmnt);
panic("ffs_realloccg: bad optim");
/* NOTREACHED */
}
bno = ffs_hashalloc(ip, cg, bpref, request, ffs_alloccg);
if (bno > 0) {
bp->b_blkno = fsbtodb(fs, bno);
if (!DOINGSOFTDEP(vp))
ffs_blkfree(fs, ip->i_devvp, bprev, (long)osize,
ip->i_number);
if (nsize < request)
ffs_blkfree(fs, ip->i_devvp, bno + numfrags(fs, nsize),
(long)(request - nsize), ip->i_number);
DIP(ip, i_blocks) += btodb(nsize - osize);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
allocbuf(bp, nsize);
bp->b_flags |= B_DONE;
bzero((char *)bp->b_data + osize, (u_int)nsize - osize);
*bpp = bp;
return (0);
}
#ifdef QUOTA
/*
* Restore user's disk quota because allocation failed.
*/
(void) chkdq(ip, -btodb(nsize - osize), cred, FORCE);
#endif
brelse(bp);
nospace:
/*
* no space available
*/
if (fs->fs_pendingblocks > 0 && reclaimed == 0) {
reclaimed = 1;
softdep_request_cleanup(fs, vp);
goto retry;
}
ffs_fserr(fs, ip->i_number, "filesystem full");
uprintf("\n%s: write failed, filesystem is full\n", fs->fs_fsmnt);
return (ENOSPC);
}
/*
* Reallocate a sequence of blocks into a contiguous sequence of blocks.
*
* The vnode and an array of buffer pointers for a range of sequential
* logical blocks to be made contiguous is given. The allocator attempts
* to find a range of sequential blocks starting as close as possible
* from the end of the allocation for the logical block immediately
* preceding the current range. If successful, the physical block numbers
* in the buffer pointers and in the inode are changed to reflect the new
* allocation. If unsuccessful, the allocation is left unchanged. The
* success in doing the reallocation is returned. Note that the error
* return is not reflected back to the user. Rather the previous block
* allocation will be used.
*/
SYSCTL_NODE(_vfs, OID_AUTO, ffs, CTLFLAG_RW, 0, "FFS filesystem");
static int doasyncfree = 1;
SYSCTL_INT(_vfs_ffs, OID_AUTO, doasyncfree, CTLFLAG_RW, &doasyncfree, 0, "");
static int doreallocblks = 1;
SYSCTL_INT(_vfs_ffs, OID_AUTO, doreallocblks, CTLFLAG_RW, &doreallocblks, 0, "");
#ifdef DEBUG
static volatile int prtrealloc = 0;
#endif
int
ffs_reallocblks(ap)
struct vop_reallocblks_args /* {
struct vnode *a_vp;
struct cluster_save *a_buflist;
} */ *ap;
{
if (doreallocblks == 0)
return (ENOSPC);
if (VTOI(ap->a_vp)->i_ump->um_fstype == UFS1)
return (ffs_reallocblks_ufs1(ap));
return (ffs_reallocblks_ufs2(ap));
}
static int
ffs_reallocblks_ufs1(ap)
struct vop_reallocblks_args /* {
struct vnode *a_vp;
struct cluster_save *a_buflist;
} */ *ap;
{
struct fs *fs;
struct inode *ip;
struct vnode *vp;
struct buf *sbp, *ebp;
ufs1_daddr_t *bap, *sbap, *ebap = 0;
struct cluster_save *buflist;
ufs_lbn_t start_lbn, end_lbn;
ufs1_daddr_t soff, newblk, blkno;
ufs2_daddr_t pref;
struct indir start_ap[NIADDR + 1], end_ap[NIADDR + 1], *idp;
int i, len, start_lvl, end_lvl, ssize;
vp = ap->a_vp;
ip = VTOI(vp);
fs = ip->i_fs;
if (fs->fs_contigsumsize <= 0)
return (ENOSPC);
buflist = ap->a_buflist;
len = buflist->bs_nchildren;
start_lbn = buflist->bs_children[0]->b_lblkno;
end_lbn = start_lbn + len - 1;
#ifdef DIAGNOSTIC
for (i = 0; i < len; i++)
if (!ffs_checkblk(ip,
dbtofsb(fs, buflist->bs_children[i]->b_blkno), fs->fs_bsize))
panic("ffs_reallocblks: unallocated block 1");
for (i = 1; i < len; i++)
if (buflist->bs_children[i]->b_lblkno != start_lbn + i)
panic("ffs_reallocblks: non-logical cluster");
blkno = buflist->bs_children[0]->b_blkno;
ssize = fsbtodb(fs, fs->fs_frag);
for (i = 1; i < len - 1; i++)
if (buflist->bs_children[i]->b_blkno != blkno + (i * ssize))
panic("ffs_reallocblks: non-physical cluster %d", i);
#endif
/*
* If the latest allocation is in a new cylinder group, assume that
* the filesystem has decided to move and do not force it back to
* the previous cylinder group.
*/
if (dtog(fs, dbtofsb(fs, buflist->bs_children[0]->b_blkno)) !=
dtog(fs, dbtofsb(fs, buflist->bs_children[len - 1]->b_blkno)))
return (ENOSPC);
if (ufs_getlbns(vp, start_lbn, start_ap, &start_lvl) ||
ufs_getlbns(vp, end_lbn, end_ap, &end_lvl))
return (ENOSPC);
/*
* Get the starting offset and block map for the first block.
*/
if (start_lvl == 0) {
sbap = &ip->i_din1->di_db[0];
soff = start_lbn;
} else {
idp = &start_ap[start_lvl - 1];
if (bread(vp, idp->in_lbn, (int)fs->fs_bsize, NOCRED, &sbp)) {
brelse(sbp);
return (ENOSPC);
}
sbap = (ufs1_daddr_t *)sbp->b_data;
soff = idp->in_off;
}
/*
* Find the preferred location for the cluster.
*/
pref = ffs_blkpref_ufs1(ip, start_lbn, soff, sbap);
/*
* If the block range spans two block maps, get the second map.
*/
if (end_lvl == 0 || (idp = &end_ap[end_lvl - 1])->in_off + 1 >= len) {
ssize = len;
} else {
#ifdef DIAGNOSTIC
if (start_ap[start_lvl-1].in_lbn == idp->in_lbn)
panic("ffs_reallocblk: start == end");
#endif
ssize = len - (idp->in_off + 1);
if (bread(vp, idp->in_lbn, (int)fs->fs_bsize, NOCRED, &ebp))
goto fail;
ebap = (ufs1_daddr_t *)ebp->b_data;
}
/*
* Search the block map looking for an allocation of the desired size.
*/
if ((newblk = ffs_hashalloc(ip, dtog(fs, pref), pref,
len, ffs_clusteralloc)) == 0)
goto fail;
/*
* We have found a new contiguous block.
*
* First we have to replace the old block pointers with the new
* block pointers in the inode and indirect blocks associated
* with the file.
*/
#ifdef DEBUG
if (prtrealloc)
printf("realloc: ino %d, lbns %jd-%jd\n\told:", ip->i_number,
(intmax_t)start_lbn, (intmax_t)end_lbn);
#endif
blkno = newblk;
for (bap = &sbap[soff], i = 0; i < len; i++, blkno += fs->fs_frag) {
if (i == ssize) {
bap = ebap;
soff = -i;
}
#ifdef DIAGNOSTIC
if (!ffs_checkblk(ip,
dbtofsb(fs, buflist->bs_children[i]->b_blkno), fs->fs_bsize))
panic("ffs_reallocblks: unallocated block 2");
if (dbtofsb(fs, buflist->bs_children[i]->b_blkno) != *bap)
panic("ffs_reallocblks: alloc mismatch");
#endif
#ifdef DEBUG
if (prtrealloc)
printf(" %d,", *bap);
#endif
if (DOINGSOFTDEP(vp)) {
if (sbap == &ip->i_din1->di_db[0] && i < ssize)
softdep_setup_allocdirect(ip, start_lbn + i,
blkno, *bap, fs->fs_bsize, fs->fs_bsize,
buflist->bs_children[i]);
else
softdep_setup_allocindir_page(ip, start_lbn + i,
i < ssize ? sbp : ebp, soff + i, blkno,
*bap, buflist->bs_children[i]);
}
*bap++ = blkno;
}
/*
* Next we must write out the modified inode and indirect blocks.
* For strict correctness, the writes should be synchronous since
* the old block values may have been written to disk. In practise
* they are almost never written, but if we are concerned about
* strict correctness, the `doasyncfree' flag should be set to zero.
*
* The test on `doasyncfree' should be changed to test a flag
* that shows whether the associated buffers and inodes have
* been written. The flag should be set when the cluster is
* started and cleared whenever the buffer or inode is flushed.
* We can then check below to see if it is set, and do the
* synchronous write only when it has been cleared.
*/
if (sbap != &ip->i_din1->di_db[0]) {
if (doasyncfree)
bdwrite(sbp);
else
bwrite(sbp);
} else {
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (!doasyncfree)
UFS_UPDATE(vp, 1);
}
if (ssize < len) {
if (doasyncfree)
bdwrite(ebp);
else
bwrite(ebp);
}
/*
* Last, free the old blocks and assign the new blocks to the buffers.
*/
#ifdef DEBUG
if (prtrealloc)
printf("\n\tnew:");
#endif
for (blkno = newblk, i = 0; i < len; i++, blkno += fs->fs_frag) {
if (!DOINGSOFTDEP(vp))
ffs_blkfree(fs, ip->i_devvp,
dbtofsb(fs, buflist->bs_children[i]->b_blkno),
fs->fs_bsize, ip->i_number);
buflist->bs_children[i]->b_blkno = fsbtodb(fs, blkno);
#ifdef DIAGNOSTIC
if (!ffs_checkblk(ip,
dbtofsb(fs, buflist->bs_children[i]->b_blkno), fs->fs_bsize))
panic("ffs_reallocblks: unallocated block 3");
#endif
#ifdef DEBUG
if (prtrealloc)
printf(" %d,", blkno);
#endif
}
#ifdef DEBUG
if (prtrealloc) {
prtrealloc--;
printf("\n");
}
#endif
return (0);
fail:
if (ssize < len)
brelse(ebp);
if (sbap != &ip->i_din1->di_db[0])
brelse(sbp);
return (ENOSPC);
}
static int
ffs_reallocblks_ufs2(ap)
struct vop_reallocblks_args /* {
struct vnode *a_vp;
struct cluster_save *a_buflist;
} */ *ap;
{
struct fs *fs;
struct inode *ip;
struct vnode *vp;
struct buf *sbp, *ebp;
ufs2_daddr_t *bap, *sbap, *ebap = 0;
struct cluster_save *buflist;
ufs_lbn_t start_lbn, end_lbn;
ufs2_daddr_t soff, newblk, blkno, pref;
struct indir start_ap[NIADDR + 1], end_ap[NIADDR + 1], *idp;
int i, len, start_lvl, end_lvl, ssize;
vp = ap->a_vp;
ip = VTOI(vp);
fs = ip->i_fs;
if (fs->fs_contigsumsize <= 0)
return (ENOSPC);
buflist = ap->a_buflist;
len = buflist->bs_nchildren;
start_lbn = buflist->bs_children[0]->b_lblkno;
end_lbn = start_lbn + len - 1;
#ifdef DIAGNOSTIC
for (i = 0; i < len; i++)
if (!ffs_checkblk(ip,
dbtofsb(fs, buflist->bs_children[i]->b_blkno), fs->fs_bsize))
panic("ffs_reallocblks: unallocated block 1");
for (i = 1; i < len; i++)
if (buflist->bs_children[i]->b_lblkno != start_lbn + i)
panic("ffs_reallocblks: non-logical cluster");
blkno = buflist->bs_children[0]->b_blkno;
ssize = fsbtodb(fs, fs->fs_frag);
for (i = 1; i < len - 1; i++)
if (buflist->bs_children[i]->b_blkno != blkno + (i * ssize))
panic("ffs_reallocblks: non-physical cluster %d", i);
#endif
/*
* If the latest allocation is in a new cylinder group, assume that
* the filesystem has decided to move and do not force it back to
* the previous cylinder group.
*/
if (dtog(fs, dbtofsb(fs, buflist->bs_children[0]->b_blkno)) !=
dtog(fs, dbtofsb(fs, buflist->bs_children[len - 1]->b_blkno)))
return (ENOSPC);
if (ufs_getlbns(vp, start_lbn, start_ap, &start_lvl) ||
ufs_getlbns(vp, end_lbn, end_ap, &end_lvl))
return (ENOSPC);
/*
* Get the starting offset and block map for the first block.
*/
if (start_lvl == 0) {
sbap = &ip->i_din2->di_db[0];
soff = start_lbn;
} else {
idp = &start_ap[start_lvl - 1];
if (bread(vp, idp->in_lbn, (int)fs->fs_bsize, NOCRED, &sbp)) {
brelse(sbp);
return (ENOSPC);
}
sbap = (ufs2_daddr_t *)sbp->b_data;
soff = idp->in_off;
}
/*
* Find the preferred location for the cluster.
*/
pref = ffs_blkpref_ufs2(ip, start_lbn, soff, sbap);
/*
* If the block range spans two block maps, get the second map.
*/
if (end_lvl == 0 || (idp = &end_ap[end_lvl - 1])->in_off + 1 >= len) {
ssize = len;
} else {
#ifdef DIAGNOSTIC
if (start_ap[start_lvl-1].in_lbn == idp->in_lbn)
panic("ffs_reallocblk: start == end");
#endif
ssize = len - (idp->in_off + 1);
if (bread(vp, idp->in_lbn, (int)fs->fs_bsize, NOCRED, &ebp))
goto fail;
ebap = (ufs2_daddr_t *)ebp->b_data;
}
/*
* Search the block map looking for an allocation of the desired size.
*/
if ((newblk = ffs_hashalloc(ip, dtog(fs, pref), pref,
len, ffs_clusteralloc)) == 0)
goto fail;
/*
* We have found a new contiguous block.
*
* First we have to replace the old block pointers with the new
* block pointers in the inode and indirect blocks associated
* with the file.
*/
#ifdef DEBUG
if (prtrealloc)
printf("realloc: ino %d, lbns %jd-%jd\n\told:", ip->i_number,
(intmax_t)start_lbn, (intmax_t)end_lbn);
#endif
blkno = newblk;
for (bap = &sbap[soff], i = 0; i < len; i++, blkno += fs->fs_frag) {
if (i == ssize) {
bap = ebap;
soff = -i;
}
#ifdef DIAGNOSTIC
if (!ffs_checkblk(ip,
dbtofsb(fs, buflist->bs_children[i]->b_blkno), fs->fs_bsize))
panic("ffs_reallocblks: unallocated block 2");
if (dbtofsb(fs, buflist->bs_children[i]->b_blkno) != *bap)
panic("ffs_reallocblks: alloc mismatch");
#endif
#ifdef DEBUG
if (prtrealloc)
printf(" %jd,", (intmax_t)*bap);
#endif
if (DOINGSOFTDEP(vp)) {
if (sbap == &ip->i_din2->di_db[0] && i < ssize)
softdep_setup_allocdirect(ip, start_lbn + i,
blkno, *bap, fs->fs_bsize, fs->fs_bsize,
buflist->bs_children[i]);
else
softdep_setup_allocindir_page(ip, start_lbn + i,
i < ssize ? sbp : ebp, soff + i, blkno,
*bap, buflist->bs_children[i]);
}
*bap++ = blkno;
}
/*
* Next we must write out the modified inode and indirect blocks.
* For strict correctness, the writes should be synchronous since
* the old block values may have been written to disk. In practise
* they are almost never written, but if we are concerned about
* strict correctness, the `doasyncfree' flag should be set to zero.
*
* The test on `doasyncfree' should be changed to test a flag
* that shows whether the associated buffers and inodes have
* been written. The flag should be set when the cluster is
* started and cleared whenever the buffer or inode is flushed.
* We can then check below to see if it is set, and do the
* synchronous write only when it has been cleared.
*/
if (sbap != &ip->i_din2->di_db[0]) {
if (doasyncfree)
bdwrite(sbp);
else
bwrite(sbp);
} else {
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (!doasyncfree)
UFS_UPDATE(vp, 1);
}
if (ssize < len) {
if (doasyncfree)
bdwrite(ebp);
else
bwrite(ebp);
}
/*
* Last, free the old blocks and assign the new blocks to the buffers.
*/
#ifdef DEBUG
if (prtrealloc)
printf("\n\tnew:");
#endif
for (blkno = newblk, i = 0; i < len; i++, blkno += fs->fs_frag) {
if (!DOINGSOFTDEP(vp))
ffs_blkfree(fs, ip->i_devvp,
dbtofsb(fs, buflist->bs_children[i]->b_blkno),
fs->fs_bsize, ip->i_number);
buflist->bs_children[i]->b_blkno = fsbtodb(fs, blkno);
#ifdef DIAGNOSTIC
if (!ffs_checkblk(ip,
dbtofsb(fs, buflist->bs_children[i]->b_blkno), fs->fs_bsize))
panic("ffs_reallocblks: unallocated block 3");
#endif
#ifdef DEBUG
if (prtrealloc)
printf(" %jd,", (intmax_t)blkno);
#endif
}
#ifdef DEBUG
if (prtrealloc) {
prtrealloc--;
printf("\n");
}
#endif
return (0);
fail:
if (ssize < len)
brelse(ebp);
if (sbap != &ip->i_din2->di_db[0])
brelse(sbp);
return (ENOSPC);
}
/*
* Allocate an inode in the filesystem.
*
* If allocating a directory, use ffs_dirpref to select the inode.
* If allocating in a directory, the following hierarchy is followed:
* 1) allocate the preferred inode.
* 2) allocate an inode in the same cylinder group.
* 3) quadradically rehash into other cylinder groups, until an
* available inode is located.
* If no inode preference is given the following heirarchy is used
* to allocate an inode:
* 1) allocate an inode in cylinder group 0.
* 2) quadradically rehash into other cylinder groups, until an
* available inode is located.
*/
int
ffs_valloc(pvp, mode, cred, vpp)
struct vnode *pvp;
int mode;
struct ucred *cred;
struct vnode **vpp;
{
struct inode *pip;
struct fs *fs;
struct inode *ip;
struct timespec ts;
ino_t ino, ipref;
int cg, error;
*vpp = NULL;
pip = VTOI(pvp);
fs = pip->i_fs;
if (fs->fs_cstotal.cs_nifree == 0)
goto noinodes;
if ((mode & IFMT) == IFDIR)
ipref = ffs_dirpref(pip);
else
ipref = pip->i_number;
if (ipref >= fs->fs_ncg * fs->fs_ipg)
ipref = 0;
cg = ino_to_cg(fs, ipref);
/*
* Track number of dirs created one after another
* in a same cg without intervening by files.
*/
if ((mode & IFMT) == IFDIR) {
if (fs->fs_contigdirs[cg] < 255)
fs->fs_contigdirs[cg]++;
} else {
if (fs->fs_contigdirs[cg] > 0)
fs->fs_contigdirs[cg]--;
}
ino = (ino_t)ffs_hashalloc(pip, cg, ipref, mode,
(allocfcn_t *)ffs_nodealloccg);
if (ino == 0)
goto noinodes;
error = VFS_VGET(pvp->v_mount, ino, LK_EXCLUSIVE, vpp);
if (error) {
UFS_VFREE(pvp, ino, mode);
return (error);
}
ip = VTOI(*vpp);
if (ip->i_mode) {
printf("mode = 0%o, inum = %lu, fs = %s\n",
ip->i_mode, (u_long)ip->i_number, fs->fs_fsmnt);
panic("ffs_valloc: dup alloc");
}
if (DIP(ip, i_blocks) && (fs->fs_flags & FS_UNCLEAN) == 0) { /* XXX */
printf("free inode %s/%lu had %ld blocks\n",
fs->fs_fsmnt, (u_long)ino, (long)DIP(ip, i_blocks));
DIP(ip, i_blocks) = 0;
}
ip->i_flags = 0;
DIP(ip, i_flags) = 0;
/*
* Set up a new generation number for this inode.
*/
if (ip->i_gen == 0 || ++ip->i_gen == 0)
ip->i_gen = arc4random() / 2 + 1;
DIP(ip, i_gen) = ip->i_gen;
if (fs->fs_magic == FS_UFS2_MAGIC) {
vfs_timestamp(&ts);
ip->i_din2->di_birthtime = ts.tv_sec;
ip->i_din2->di_birthnsec = ts.tv_nsec;
}
return (0);
noinodes:
ffs_fserr(fs, pip->i_number, "out of inodes");
uprintf("\n%s: create/symlink failed, no inodes free\n", fs->fs_fsmnt);
return (ENOSPC);
}
/*
* Find a cylinder group to place a directory.
*
* The policy implemented by this algorithm is to allocate a
* directory inode in the same cylinder group as its parent
* directory, but also to reserve space for its files inodes
* and data. Restrict the number of directories which may be
* allocated one after another in the same cylinder group
* without intervening allocation of files.
*
* If we allocate a first level directory then force allocation
* in another cylinder group.
*/
static ino_t
ffs_dirpref(pip)
struct inode *pip;
{
struct fs *fs;
int cg, prefcg, dirsize, cgsize;
int avgifree, avgbfree, avgndir, curdirsize;
int minifree, minbfree, maxndir;
int mincg, minndir;
int maxcontigdirs;
fs = pip->i_fs;
avgifree = fs->fs_cstotal.cs_nifree / fs->fs_ncg;
avgbfree = fs->fs_cstotal.cs_nbfree / fs->fs_ncg;
avgndir = fs->fs_cstotal.cs_ndir / fs->fs_ncg;
/*
* Force allocation in another cg if creating a first level dir.
*/
ASSERT_VOP_LOCKED(ITOV(pip), "ffs_dirpref");
if (ITOV(pip)->v_vflag & VV_ROOT) {
prefcg = arc4random() % fs->fs_ncg;
mincg = prefcg;
minndir = fs->fs_ipg;
for (cg = prefcg; cg < fs->fs_ncg; cg++)
if (fs->fs_cs(fs, cg).cs_ndir < minndir &&
fs->fs_cs(fs, cg).cs_nifree >= avgifree &&
fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) {
mincg = cg;
minndir = fs->fs_cs(fs, cg).cs_ndir;
}
for (cg = 0; cg < prefcg; cg++)
if (fs->fs_cs(fs, cg).cs_ndir < minndir &&
fs->fs_cs(fs, cg).cs_nifree >= avgifree &&
fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) {
mincg = cg;
minndir = fs->fs_cs(fs, cg).cs_ndir;
}
return ((ino_t)(fs->fs_ipg * mincg));
}
/*
* Count various limits which used for
* optimal allocation of a directory inode.
*/
maxndir = min(avgndir + fs->fs_ipg / 16, fs->fs_ipg);
minifree = avgifree - avgifree / 4;
if (minifree < 1)
minifree = 1;
minbfree = avgbfree - avgbfree / 4;
if (minbfree < 1)
minbfree = 1;
cgsize = fs->fs_fsize * fs->fs_fpg;
dirsize = fs->fs_avgfilesize * fs->fs_avgfpdir;
curdirsize = avgndir ? (cgsize - avgbfree * fs->fs_bsize) / avgndir : 0;
if (dirsize < curdirsize)
dirsize = curdirsize;
maxcontigdirs = min((avgbfree * fs->fs_bsize) / dirsize, 255);
if (fs->fs_avgfpdir > 0)
maxcontigdirs = min(maxcontigdirs,
fs->fs_ipg / fs->fs_avgfpdir);
if (maxcontigdirs == 0)
maxcontigdirs = 1;
/*
* Limit number of dirs in one cg and reserve space for
* regular files, but only if we have no deficit in
* inodes or space.
*/
prefcg = ino_to_cg(fs, pip->i_number);
for (cg = prefcg; cg < fs->fs_ncg; cg++)
if (fs->fs_cs(fs, cg).cs_ndir < maxndir &&
fs->fs_cs(fs, cg).cs_nifree >= minifree &&
fs->fs_cs(fs, cg).cs_nbfree >= minbfree) {
if (fs->fs_contigdirs[cg] < maxcontigdirs)
return ((ino_t)(fs->fs_ipg * cg));
}
for (cg = 0; cg < prefcg; cg++)
if (fs->fs_cs(fs, cg).cs_ndir < maxndir &&
fs->fs_cs(fs, cg).cs_nifree >= minifree &&
fs->fs_cs(fs, cg).cs_nbfree >= minbfree) {
if (fs->fs_contigdirs[cg] < maxcontigdirs)
return ((ino_t)(fs->fs_ipg * cg));
}
/*
* This is a backstop when we have deficit in space.
*/
for (cg = prefcg; cg < fs->fs_ncg; cg++)
if (fs->fs_cs(fs, cg).cs_nifree >= avgifree)
return ((ino_t)(fs->fs_ipg * cg));
for (cg = 0; cg < prefcg; cg++)
if (fs->fs_cs(fs, cg).cs_nifree >= avgifree)
break;
return ((ino_t)(fs->fs_ipg * cg));
}
/*
* Select the desired position for the next block in a file. The file is
* logically divided into sections. The first section is composed of the
* direct blocks. Each additional section contains fs_maxbpg blocks.
*
* If no blocks have been allocated in the first section, the policy is to
* request a block in the same cylinder group as the inode that describes
* the file. If no blocks have been allocated in any other section, the
* policy is to place the section in a cylinder group with a greater than
* average number of free blocks. An appropriate cylinder group is found
* by using a rotor that sweeps the cylinder groups. When a new group of
* blocks is needed, the sweep begins in the cylinder group following the
* cylinder group from which the previous allocation was made. The sweep
* continues until a cylinder group with greater than the average number
* of free blocks is found. If the allocation is for the first block in an
* indirect block, the information on the previous allocation is unavailable;
* here a best guess is made based upon the logical block number being
* allocated.
*
* If a section is already partially allocated, the policy is to
* contiguously allocate fs_maxcontig blocks. The end of one of these
* contiguous blocks and the beginning of the next is laid out
* contiguously if possible.
*/
ufs2_daddr_t
ffs_blkpref_ufs1(ip, lbn, indx, bap)
struct inode *ip;
ufs_lbn_t lbn;
int indx;
ufs1_daddr_t *bap;
{
struct fs *fs;
int cg;
int avgbfree, startcg;
fs = ip->i_fs;
if (indx % fs->fs_maxbpg == 0 || bap[indx - 1] == 0) {
if (lbn < NDADDR + NINDIR(fs)) {
cg = ino_to_cg(fs, ip->i_number);
return (fs->fs_fpg * cg + fs->fs_frag);
}
/*
* Find a cylinder with greater than average number of
* unused data blocks.
*/
if (indx == 0 || bap[indx - 1] == 0)
startcg =
ino_to_cg(fs, ip->i_number) + lbn / fs->fs_maxbpg;
else
startcg = dtog(fs, bap[indx - 1]) + 1;
startcg %= fs->fs_ncg;
avgbfree = fs->fs_cstotal.cs_nbfree / fs->fs_ncg;
for (cg = startcg; cg < fs->fs_ncg; cg++)
if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) {
fs->fs_cgrotor = cg;
return (fs->fs_fpg * cg + fs->fs_frag);
}
for (cg = 0; cg <= startcg; cg++)
if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) {
fs->fs_cgrotor = cg;
return (fs->fs_fpg * cg + fs->fs_frag);
}
return (0);
}
/*
* We just always try to lay things out contiguously.
*/
return (bap[indx - 1] + fs->fs_frag);
}
/*
* Same as above, but for UFS2
*/
ufs2_daddr_t
ffs_blkpref_ufs2(ip, lbn, indx, bap)
struct inode *ip;
ufs_lbn_t lbn;
int indx;
ufs2_daddr_t *bap;
{
struct fs *fs;
int cg;
int avgbfree, startcg;
fs = ip->i_fs;
if (indx % fs->fs_maxbpg == 0 || bap[indx - 1] == 0) {
if (lbn < NDADDR + NINDIR(fs)) {
cg = ino_to_cg(fs, ip->i_number);
return (fs->fs_fpg * cg + fs->fs_frag);
}
/*
* Find a cylinder with greater than average number of
* unused data blocks.
*/
if (indx == 0 || bap[indx - 1] == 0)
startcg =
ino_to_cg(fs, ip->i_number) + lbn / fs->fs_maxbpg;
else
startcg = dtog(fs, bap[indx - 1]) + 1;
startcg %= fs->fs_ncg;
avgbfree = fs->fs_cstotal.cs_nbfree / fs->fs_ncg;
for (cg = startcg; cg < fs->fs_ncg; cg++)
if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) {
fs->fs_cgrotor = cg;
return (fs->fs_fpg * cg + fs->fs_frag);
}
for (cg = 0; cg <= startcg; cg++)
if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) {
fs->fs_cgrotor = cg;
return (fs->fs_fpg * cg + fs->fs_frag);
}
return (0);
}
/*
* We just always try to lay things out contiguously.
*/
return (bap[indx - 1] + fs->fs_frag);
}
/*
* Implement the cylinder overflow algorithm.
*
* The policy implemented by this algorithm is:
* 1) allocate the block in its requested cylinder group.
* 2) quadradically rehash on the cylinder group number.
* 3) brute force search for a free block.
*/
/*VARARGS5*/
static ufs2_daddr_t
ffs_hashalloc(ip, cg, pref, size, allocator)
struct inode *ip;
int cg;
ufs2_daddr_t pref;
int size; /* size for data blocks, mode for inodes */
allocfcn_t *allocator;
{
struct fs *fs;
ufs2_daddr_t result;
int i, icg = cg;
#ifdef DIAGNOSTIC
if (ITOV(ip)->v_mount->mnt_kern_flag & MNTK_SUSPENDED)
panic("ffs_hashalloc: allocation on suspended filesystem");
#endif
fs = ip->i_fs;
/*
* 1: preferred cylinder group
*/
result = (*allocator)(ip, cg, pref, size);
if (result)
return (result);
/*
* 2: quadratic rehash
*/
for (i = 1; i < fs->fs_ncg; i *= 2) {
cg += i;
if (cg >= fs->fs_ncg)
cg -= fs->fs_ncg;
result = (*allocator)(ip, cg, 0, size);
if (result)
return (result);
}
/*
* 3: brute force search
* Note that we start at i == 2, since 0 was checked initially,
* and 1 is always checked in the quadratic rehash.
*/
cg = (icg + 2) % fs->fs_ncg;
for (i = 2; i < fs->fs_ncg; i++) {
result = (*allocator)(ip, cg, 0, size);
if (result)
return (result);
cg++;
if (cg == fs->fs_ncg)
cg = 0;
}
return (0);
}
/*
* Determine whether a fragment can be extended.
*
* Check to see if the necessary fragments are available, and
* if they are, allocate them.
*/
static ufs2_daddr_t
ffs_fragextend(ip, cg, bprev, osize, nsize)
struct inode *ip;
int cg;
ufs2_daddr_t bprev;
int osize, nsize;
{
struct fs *fs;
struct cg *cgp;
struct buf *bp;
long bno;
int frags, bbase;
int i, error;
u_int8_t *blksfree;
fs = ip->i_fs;
if (fs->fs_cs(fs, cg).cs_nffree < numfrags(fs, nsize - osize))
return (0);
frags = numfrags(fs, nsize);
bbase = fragnum(fs, bprev);
if (bbase > fragnum(fs, (bprev + frags - 1))) {
/* cannot extend across a block boundary */
return (0);
}
error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)),
(int)fs->fs_cgsize, NOCRED, &bp);
if (error) {
brelse(bp);
return (0);
}
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp)) {
brelse(bp);
return (0);
}
bp->b_xflags |= BX_BKGRDWRITE;
cgp->cg_old_time = cgp->cg_time = time_second;
bno = dtogd(fs, bprev);
blksfree = cg_blksfree(cgp);
for (i = numfrags(fs, osize); i < frags; i++)
if (isclr(blksfree, bno + i)) {
brelse(bp);
return (0);
}
/*
* the current fragment can be extended
* deduct the count on fragment being extended into
* increase the count on the remaining fragment (if any)
* allocate the extended piece
*/
for (i = frags; i < fs->fs_frag - bbase; i++)
if (isclr(blksfree, bno + i))
break;
cgp->cg_frsum[i - numfrags(fs, osize)]--;
if (i != frags)
cgp->cg_frsum[i - frags]++;
for (i = numfrags(fs, osize); i < frags; i++) {
clrbit(blksfree, bno + i);
cgp->cg_cs.cs_nffree--;
fs->fs_cstotal.cs_nffree--;
fs->fs_cs(fs, cg).cs_nffree--;
}
fs->fs_fmod = 1;
if (DOINGSOFTDEP(ITOV(ip)))
softdep_setup_blkmapdep(bp, fs, bprev);
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
return (bprev);
}
/*
* Determine whether a block can be allocated.
*
* Check to see if a block of the appropriate size is available,
* and if it is, allocate it.
*/
static ufs2_daddr_t
ffs_alloccg(ip, cg, bpref, size)
struct inode *ip;
int cg;
ufs2_daddr_t bpref;
int size;
{
struct fs *fs;
struct cg *cgp;
struct buf *bp;
ufs1_daddr_t bno;
ufs2_daddr_t blkno;
int i, allocsiz, error, frags;
u_int8_t *blksfree;
fs = ip->i_fs;
if (fs->fs_cs(fs, cg).cs_nbfree == 0 && size == fs->fs_bsize)
return (0);
error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)),
(int)fs->fs_cgsize, NOCRED, &bp);
if (error) {
brelse(bp);
return (0);
}
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp) ||
(cgp->cg_cs.cs_nbfree == 0 && size == fs->fs_bsize)) {
brelse(bp);
return (0);
}
bp->b_xflags |= BX_BKGRDWRITE;
cgp->cg_old_time = cgp->cg_time = time_second;
if (size == fs->fs_bsize) {
blkno = ffs_alloccgblk(ip, bp, bpref);
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
return (blkno);
}
/*
* check to see if any fragments are already available
* allocsiz is the size which will be allocated, hacking
* it down to a smaller size if necessary
*/
blksfree = cg_blksfree(cgp);
frags = numfrags(fs, size);
for (allocsiz = frags; allocsiz < fs->fs_frag; allocsiz++)
if (cgp->cg_frsum[allocsiz] != 0)
break;
if (allocsiz == fs->fs_frag) {
/*
* no fragments were available, so a block will be
* allocated, and hacked up
*/
if (cgp->cg_cs.cs_nbfree == 0) {
brelse(bp);
return (0);
}
blkno = ffs_alloccgblk(ip, bp, bpref);
bno = dtogd(fs, blkno);
for (i = frags; i < fs->fs_frag; i++)
setbit(blksfree, bno + i);
i = fs->fs_frag - frags;
cgp->cg_cs.cs_nffree += i;
fs->fs_cstotal.cs_nffree += i;
fs->fs_cs(fs, cg).cs_nffree += i;
fs->fs_fmod = 1;
cgp->cg_frsum[i]++;
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
return (blkno);
}
bno = ffs_mapsearch(fs, cgp, bpref, allocsiz);
if (bno < 0) {
brelse(bp);
return (0);
}
for (i = 0; i < frags; i++)
clrbit(blksfree, bno + i);
cgp->cg_cs.cs_nffree -= frags;
fs->fs_cstotal.cs_nffree -= frags;
fs->fs_cs(fs, cg).cs_nffree -= frags;
fs->fs_fmod = 1;
cgp->cg_frsum[allocsiz]--;
if (frags != allocsiz)
cgp->cg_frsum[allocsiz - frags]++;
blkno = cg * fs->fs_fpg + bno;
if (DOINGSOFTDEP(ITOV(ip)))
softdep_setup_blkmapdep(bp, fs, blkno);
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
return (blkno);
}
/*
* Allocate a block in a cylinder group.
*
* This algorithm implements the following policy:
* 1) allocate the requested block.
* 2) allocate a rotationally optimal block in the same cylinder.
* 3) allocate the next available block on the block rotor for the
* specified cylinder group.
* Note that this routine only allocates fs_bsize blocks; these
* blocks may be fragmented by the routine that allocates them.
*/
static ufs2_daddr_t
ffs_alloccgblk(ip, bp, bpref)
struct inode *ip;
struct buf *bp;
ufs2_daddr_t bpref;
{
struct fs *fs;
struct cg *cgp;
ufs1_daddr_t bno;
ufs2_daddr_t blkno;
u_int8_t *blksfree;
fs = ip->i_fs;
cgp = (struct cg *)bp->b_data;
blksfree = cg_blksfree(cgp);
if (bpref == 0 || dtog(fs, bpref) != cgp->cg_cgx) {
bpref = cgp->cg_rotor;
} else {
bpref = blknum(fs, bpref);
bno = dtogd(fs, bpref);
/*
* if the requested block is available, use it
*/
if (ffs_isblock(fs, blksfree, fragstoblks(fs, bno)))
goto gotit;
}
/*
* Take the next available block in this cylinder group.
*/
bno = ffs_mapsearch(fs, cgp, bpref, (int)fs->fs_frag);
if (bno < 0)
return (0);
cgp->cg_rotor = bno;
gotit:
blkno = fragstoblks(fs, bno);
ffs_clrblock(fs, blksfree, (long)blkno);
ffs_clusteracct(fs, cgp, blkno, -1);
cgp->cg_cs.cs_nbfree--;
fs->fs_cstotal.cs_nbfree--;
fs->fs_cs(fs, cgp->cg_cgx).cs_nbfree--;
fs->fs_fmod = 1;
blkno = cgp->cg_cgx * fs->fs_fpg + bno;
if (DOINGSOFTDEP(ITOV(ip)))
softdep_setup_blkmapdep(bp, fs, blkno);
return (blkno);
}
/*
* Determine whether a cluster can be allocated.
*
* We do not currently check for optimal rotational layout if there
* are multiple choices in the same cylinder group. Instead we just
* take the first one that we find following bpref.
*/
static ufs2_daddr_t
ffs_clusteralloc(ip, cg, bpref, len)
struct inode *ip;
int cg;
ufs2_daddr_t bpref;
int len;
{
struct fs *fs;
struct cg *cgp;
struct buf *bp;
int i, run, bit, map, got;
ufs2_daddr_t bno;
u_char *mapp;
int32_t *lp;
u_int8_t *blksfree;
fs = ip->i_fs;
if (fs->fs_maxcluster[cg] < len)
return (0);
if (bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)), (int)fs->fs_cgsize,
NOCRED, &bp))
goto fail;
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp))
goto fail;
bp->b_xflags |= BX_BKGRDWRITE;
/*
* Check to see if a cluster of the needed size (or bigger) is
* available in this cylinder group.
*/
lp = &cg_clustersum(cgp)[len];
for (i = len; i <= fs->fs_contigsumsize; i++)
if (*lp++ > 0)
break;
if (i > fs->fs_contigsumsize) {
/*
* This is the first time looking for a cluster in this
* cylinder group. Update the cluster summary information
* to reflect the true maximum sized cluster so that
* future cluster allocation requests can avoid reading
* the cylinder group map only to find no clusters.
*/
lp = &cg_clustersum(cgp)[len - 1];
for (i = len - 1; i > 0; i--)
if (*lp-- > 0)
break;
fs->fs_maxcluster[cg] = i;
goto fail;
}
/*
* Search the cluster map to find a big enough cluster.
* We take the first one that we find, even if it is larger
* than we need as we prefer to get one close to the previous
* block allocation. We do not search before the current
* preference point as we do not want to allocate a block
* that is allocated before the previous one (as we will
* then have to wait for another pass of the elevator
* algorithm before it will be read). We prefer to fail and
* be recalled to try an allocation in the next cylinder group.
*/
if (dtog(fs, bpref) != cg)
bpref = 0;
else
bpref = fragstoblks(fs, dtogd(fs, blknum(fs, bpref)));
mapp = &cg_clustersfree(cgp)[bpref / NBBY];
map = *mapp++;
bit = 1 << (bpref % NBBY);
for (run = 0, got = bpref; got < cgp->cg_nclusterblks; got++) {
if ((map & bit) == 0) {
run = 0;
} else {
run++;
if (run == len)
break;
}
if ((got & (NBBY - 1)) != (NBBY - 1)) {
bit <<= 1;
} else {
map = *mapp++;
bit = 1;
}
}
if (got >= cgp->cg_nclusterblks)
goto fail;
/*
* Allocate the cluster that we have found.
*/
blksfree = cg_blksfree(cgp);
for (i = 1; i <= len; i++)
if (!ffs_isblock(fs, blksfree, got - run + i))
panic("ffs_clusteralloc: map mismatch");
bno = cg * fs->fs_fpg + blkstofrags(fs, got - run + 1);
if (dtog(fs, bno) != cg)
panic("ffs_clusteralloc: allocated out of group");
len = blkstofrags(fs, len);
for (i = 0; i < len; i += fs->fs_frag)
if (ffs_alloccgblk(ip, bp, bno + i) != bno + i)
panic("ffs_clusteralloc: lost block");
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
return (bno);
fail:
brelse(bp);
return (0);
}
/*
* Determine whether an inode can be allocated.
*
* Check to see if an inode is available, and if it is,
* allocate it using the following policy:
* 1) allocate the requested inode.
* 2) allocate the next available inode after the requested
* inode in the specified cylinder group.
*/
static ufs2_daddr_t
ffs_nodealloccg(ip, cg, ipref, mode)
struct inode *ip;
int cg;
ufs2_daddr_t ipref;
int mode;
{
struct fs *fs;
struct cg *cgp;
struct buf *bp, *ibp;
u_int8_t *inosused;
struct ufs2_dinode *dp2;
int error, start, len, loc, map, i;
fs = ip->i_fs;
if (fs->fs_cs(fs, cg).cs_nifree == 0)
return (0);
error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)),
(int)fs->fs_cgsize, NOCRED, &bp);
if (error) {
brelse(bp);
return (0);
}
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp) || cgp->cg_cs.cs_nifree == 0) {
brelse(bp);
return (0);
}
bp->b_xflags |= BX_BKGRDWRITE;
cgp->cg_old_time = cgp->cg_time = time_second;
inosused = cg_inosused(cgp);
if (ipref) {
ipref %= fs->fs_ipg;
if (isclr(inosused, ipref))
goto gotit;
}
start = cgp->cg_irotor / NBBY;
len = howmany(fs->fs_ipg - cgp->cg_irotor, NBBY);
loc = skpc(0xff, len, &inosused[start]);
if (loc == 0) {
len = start + 1;
start = 0;
loc = skpc(0xff, len, &inosused[0]);
if (loc == 0) {
printf("cg = %d, irotor = %ld, fs = %s\n",
cg, (long)cgp->cg_irotor, fs->fs_fsmnt);
panic("ffs_nodealloccg: map corrupted");
/* NOTREACHED */
}
}
i = start + len - loc;
map = inosused[i];
ipref = i * NBBY;
for (i = 1; i < (1 << NBBY); i <<= 1, ipref++) {
if ((map & i) == 0) {
cgp->cg_irotor = ipref;
goto gotit;
}
}
printf("fs = %s\n", fs->fs_fsmnt);
panic("ffs_nodealloccg: block not in map");
/* NOTREACHED */
gotit:
if (DOINGSOFTDEP(ITOV(ip)))
softdep_setup_inomapdep(bp, ip, cg * fs->fs_ipg + ipref);
setbit(inosused, ipref);
cgp->cg_cs.cs_nifree--;
fs->fs_cstotal.cs_nifree--;
fs->fs_cs(fs, cg).cs_nifree--;
fs->fs_fmod = 1;
if ((mode & IFMT) == IFDIR) {
cgp->cg_cs.cs_ndir++;
fs->fs_cstotal.cs_ndir++;
fs->fs_cs(fs, cg).cs_ndir++;
}
/*
* Check to see if we need to initialize more inodes.
*/
if (fs->fs_magic == FS_UFS2_MAGIC &&
ipref + INOPB(fs) > cgp->cg_initediblk &&
cgp->cg_initediblk < cgp->cg_niblk) {
ibp = getblk(ip->i_devvp, fsbtodb(fs,
ino_to_fsba(fs, cg * fs->fs_ipg + cgp->cg_initediblk)),
(int)fs->fs_bsize, 0, 0, 0);
bzero(ibp->b_data, (int)fs->fs_bsize);
dp2 = (struct ufs2_dinode *)(ibp->b_data);
for (i = 0; i < INOPB(fs); i++) {
dp2->di_gen = arc4random() / 2 + 1;
dp2++;
}
bawrite(ibp);
cgp->cg_initediblk += INOPB(fs);
}
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
return (cg * fs->fs_ipg + ipref);
}
/*
* check if a block is free
*/
static int
ffs_isfreeblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
{
switch ((int)fs->fs_frag) {
case 8:
return (cp[h] == 0);
case 4:
return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
case 2:
return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
case 1:
return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
default:
panic("ffs_isfreeblock");
}
return (0);
}
/*
* Free a block or fragment.
*
* The specified block or fragment is placed back in the
* free map. If a fragment is deallocated, a possible
* block reassembly is checked.
*/
void
ffs_blkfree(fs, devvp, bno, size, inum)
struct fs *fs;
struct vnode *devvp;
ufs2_daddr_t bno;
long size;
ino_t inum;
{
struct cg *cgp;
struct buf *bp;
ufs1_daddr_t fragno, cgbno;
ufs2_daddr_t cgblkno;
int i, cg, blk, frags, bbase;
u_int8_t *blksfree;
dev_t dev;
cg = dtog(fs, bno);
if (devvp->v_type != VCHR) {
/* devvp is a snapshot */
dev = VTOI(devvp)->i_devvp->v_rdev;
cgblkno = fragstoblks(fs, cgtod(fs, cg));
} else {
/* devvp is a normal disk device */
dev = devvp->v_rdev;
cgblkno = fsbtodb(fs, cgtod(fs, cg));
ASSERT_VOP_LOCKED(devvp, "ffs_blkfree");
if ((devvp->v_vflag & VV_COPYONWRITE) &&
ffs_snapblkfree(fs, devvp, bno, size, inum))
return;
VOP_FREEBLKS(devvp, fsbtodb(fs, bno), size);
}
#ifdef DIAGNOSTIC
if (dev->si_mountpoint &&
(dev->si_mountpoint->mnt_kern_flag & MNTK_SUSPENDED))
panic("ffs_blkfree: deallocation on suspended filesystem");
if ((u_int)size > fs->fs_bsize || fragoff(fs, size) != 0 ||
fragnum(fs, bno) + numfrags(fs, size) > fs->fs_frag) {
printf("dev=%s, bno = %jd, bsize = %ld, size = %ld, fs = %s\n",
devtoname(dev), (intmax_t)bno, (long)fs->fs_bsize,
size, fs->fs_fsmnt);
panic("ffs_blkfree: bad size");
}
#endif
if ((u_int)bno >= fs->fs_size) {
printf("bad block %jd, ino %lu\n", (intmax_t)bno,
(u_long)inum);
ffs_fserr(fs, inum, "bad block");
return;
}
if (bread(devvp, cgblkno, (int)fs->fs_cgsize, NOCRED, &bp)) {
brelse(bp);
return;
}
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp)) {
brelse(bp);
return;
}
bp->b_xflags |= BX_BKGRDWRITE;
cgp->cg_old_time = cgp->cg_time = time_second;
cgbno = dtogd(fs, bno);
blksfree = cg_blksfree(cgp);
if (size == fs->fs_bsize) {
fragno = fragstoblks(fs, cgbno);
if (!ffs_isfreeblock(fs, blksfree, fragno)) {
if (devvp->v_type != VCHR) {
/* devvp is a snapshot */
brelse(bp);
return;
}
printf("dev = %s, block = %jd, fs = %s\n",
devtoname(dev), (intmax_t)bno, fs->fs_fsmnt);
panic("ffs_blkfree: freeing free block");
}
ffs_setblock(fs, blksfree, fragno);
ffs_clusteracct(fs, cgp, fragno, 1);
cgp->cg_cs.cs_nbfree++;
fs->fs_cstotal.cs_nbfree++;
fs->fs_cs(fs, cg).cs_nbfree++;
} else {
bbase = cgbno - fragnum(fs, cgbno);
/*
* decrement the counts associated with the old frags
*/
blk = blkmap(fs, blksfree, bbase);
ffs_fragacct(fs, blk, cgp->cg_frsum, -1);
/*
* deallocate the fragment
*/
frags = numfrags(fs, size);
for (i = 0; i < frags; i++) {
if (isset(blksfree, cgbno + i)) {
printf("dev = %s, block = %jd, fs = %s\n",
devtoname(dev), (intmax_t)(bno + i),
fs->fs_fsmnt);
panic("ffs_blkfree: freeing free frag");
}
setbit(blksfree, cgbno + i);
}
cgp->cg_cs.cs_nffree += i;
fs->fs_cstotal.cs_nffree += i;
fs->fs_cs(fs, cg).cs_nffree += i;
/*
* add back in counts associated with the new frags
*/
blk = blkmap(fs, blksfree, bbase);
ffs_fragacct(fs, blk, cgp->cg_frsum, 1);
/*
* if a complete block has been reassembled, account for it
*/
fragno = fragstoblks(fs, bbase);
if (ffs_isblock(fs, blksfree, fragno)) {
cgp->cg_cs.cs_nffree -= fs->fs_frag;
fs->fs_cstotal.cs_nffree -= fs->fs_frag;
fs->fs_cs(fs, cg).cs_nffree -= fs->fs_frag;
ffs_clusteracct(fs, cgp, fragno, 1);
cgp->cg_cs.cs_nbfree++;
fs->fs_cstotal.cs_nbfree++;
fs->fs_cs(fs, cg).cs_nbfree++;
}
}
fs->fs_fmod = 1;
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
}
#ifdef DIAGNOSTIC
/*
* Verify allocation of a block or fragment. Returns true if block or
* fragment is allocated, false if it is free.
*/
static int
ffs_checkblk(ip, bno, size)
struct inode *ip;
ufs2_daddr_t bno;
long size;
{
struct fs *fs;
struct cg *cgp;
struct buf *bp;
ufs1_daddr_t cgbno;
int i, error, frags, free;
u_int8_t *blksfree;
fs = ip->i_fs;
if ((u_int)size > fs->fs_bsize || fragoff(fs, size) != 0) {
printf("bsize = %ld, size = %ld, fs = %s\n",
(long)fs->fs_bsize, size, fs->fs_fsmnt);
panic("ffs_checkblk: bad size");
}
if ((u_int)bno >= fs->fs_size)
panic("ffs_checkblk: bad block %jd", (intmax_t)bno);
error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, dtog(fs, bno))),
(int)fs->fs_cgsize, NOCRED, &bp);
if (error)
panic("ffs_checkblk: cg bread failed");
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp))
panic("ffs_checkblk: cg magic mismatch");
bp->b_xflags |= BX_BKGRDWRITE;
blksfree = cg_blksfree(cgp);
cgbno = dtogd(fs, bno);
if (size == fs->fs_bsize) {
free = ffs_isblock(fs, blksfree, fragstoblks(fs, cgbno));
} else {
frags = numfrags(fs, size);
for (free = 0, i = 0; i < frags; i++)
if (isset(blksfree, cgbno + i))
free++;
if (free != 0 && free != frags)
panic("ffs_checkblk: partially free fragment");
}
brelse(bp);
return (!free);
}
#endif /* DIAGNOSTIC */
/*
* Free an inode.
*/
int
ffs_vfree(pvp, ino, mode)
struct vnode *pvp;
ino_t ino;
int mode;
{
if (DOINGSOFTDEP(pvp)) {
softdep_freefile(pvp, ino, mode);
return (0);
}
return (ffs_freefile(VTOI(pvp)->i_fs, VTOI(pvp)->i_devvp, ino, mode));
}
/*
* Do the actual free operation.
* The specified inode is placed back in the free map.
*/
int
ffs_freefile(fs, devvp, ino, mode)
struct fs *fs;
struct vnode *devvp;
ino_t ino;
int mode;
{
struct cg *cgp;
struct buf *bp;
ufs2_daddr_t cgbno;
int error, cg;
u_int8_t *inosused;
dev_t dev;
cg = ino_to_cg(fs, ino);
if (devvp->v_type != VCHR) {
/* devvp is a snapshot */
dev = VTOI(devvp)->i_devvp->v_rdev;
cgbno = fragstoblks(fs, cgtod(fs, cg));
} else {
/* devvp is a normal disk device */
dev = devvp->v_rdev;
cgbno = fsbtodb(fs, cgtod(fs, cg));
}
if ((u_int)ino >= fs->fs_ipg * fs->fs_ncg)
panic("ffs_freefile: range: dev = %s, ino = %lu, fs = %s",
devtoname(dev), (u_long)ino, fs->fs_fsmnt);
if ((error = bread(devvp, cgbno, (int)fs->fs_cgsize, NOCRED, &bp))) {
brelse(bp);
return (error);
}
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp)) {
brelse(bp);
return (0);
}
bp->b_xflags |= BX_BKGRDWRITE;
cgp->cg_old_time = cgp->cg_time = time_second;
inosused = cg_inosused(cgp);
ino %= fs->fs_ipg;
if (isclr(inosused, ino)) {
printf("dev = %s, ino = %lu, fs = %s\n", devtoname(dev),
(u_long)ino + cg * fs->fs_ipg, fs->fs_fsmnt);
if (fs->fs_ronly == 0)
panic("ffs_freefile: freeing free inode");
}
clrbit(inosused, ino);
if (ino < cgp->cg_irotor)
cgp->cg_irotor = ino;
cgp->cg_cs.cs_nifree++;
fs->fs_cstotal.cs_nifree++;
fs->fs_cs(fs, cg).cs_nifree++;
if ((mode & IFMT) == IFDIR) {
cgp->cg_cs.cs_ndir--;
fs->fs_cstotal.cs_ndir--;
fs->fs_cs(fs, cg).cs_ndir--;
}
fs->fs_fmod = 1;
if (fs->fs_active != 0)
atomic_clear_int(&ACTIVECGNUM(fs, cg), ACTIVECGOFF(cg));
bdwrite(bp);
return (0);
}
/*
* Check to see if a file is free.
*/
int
ffs_checkfreefile(fs, devvp, ino)
struct fs *fs;
struct vnode *devvp;
ino_t ino;
{
struct cg *cgp;
struct buf *bp;
ufs2_daddr_t cgbno;
int ret, cg;
u_int8_t *inosused;
cg = ino_to_cg(fs, ino);
if (devvp->v_type != VCHR) {
/* devvp is a snapshot */
cgbno = fragstoblks(fs, cgtod(fs, cg));
} else {
/* devvp is a normal disk device */
cgbno = fsbtodb(fs, cgtod(fs, cg));
}
if ((u_int)ino >= fs->fs_ipg * fs->fs_ncg)
return (1);
if (bread(devvp, cgbno, (int)fs->fs_cgsize, NOCRED, &bp)) {
brelse(bp);
return (1);
}
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp)) {
brelse(bp);
return (1);
}
inosused = cg_inosused(cgp);
ino %= fs->fs_ipg;
ret = isclr(inosused, ino);
brelse(bp);
return (ret);
}
/*
* Find a block of the specified size in the specified cylinder group.
*
* It is a panic if a request is made to find a block if none are
* available.
*/
static ufs1_daddr_t
ffs_mapsearch(fs, cgp, bpref, allocsiz)
struct fs *fs;
struct cg *cgp;
ufs2_daddr_t bpref;
int allocsiz;
{
ufs1_daddr_t bno;
int start, len, loc, i;
int blk, field, subfield, pos;
u_int8_t *blksfree;
/*
* find the fragment by searching through the free block
* map for an appropriate bit pattern
*/
if (bpref)
start = dtogd(fs, bpref) / NBBY;
else
start = cgp->cg_frotor / NBBY;
blksfree = cg_blksfree(cgp);
len = howmany(fs->fs_fpg, NBBY) - start;
loc = scanc((u_int)len, (u_char *)&blksfree[start],
(u_char *)fragtbl[fs->fs_frag],
(u_char)(1 << (allocsiz - 1 + (fs->fs_frag % NBBY))));
if (loc == 0) {
len = start + 1;
start = 0;
loc = scanc((u_int)len, (u_char *)&blksfree[0],
(u_char *)fragtbl[fs->fs_frag],
(u_char)(1 << (allocsiz - 1 + (fs->fs_frag % NBBY))));
if (loc == 0) {
printf("start = %d, len = %d, fs = %s\n",
start, len, fs->fs_fsmnt);
panic("ffs_alloccg: map corrupted");
/* NOTREACHED */
}
}
bno = (start + len - loc) * NBBY;
cgp->cg_frotor = bno;
/*
* found the byte in the map
* sift through the bits to find the selected frag
*/
for (i = bno + NBBY; bno < i; bno += fs->fs_frag) {
blk = blkmap(fs, blksfree, bno);
blk <<= 1;
field = around[allocsiz];
subfield = inside[allocsiz];
for (pos = 0; pos <= fs->fs_frag - allocsiz; pos++) {
if ((blk & field) == subfield)
return (bno + pos);
field <<= 1;
subfield <<= 1;
}
}
printf("bno = %lu, fs = %s\n", (u_long)bno, fs->fs_fsmnt);
panic("ffs_alloccg: block not in map");
return (-1);
}
/*
* Update the cluster map because of an allocation or free.
*
* Cnt == 1 means free; cnt == -1 means allocating.
*/
void
ffs_clusteracct(fs, cgp, blkno, cnt)
struct fs *fs;
struct cg *cgp;
ufs1_daddr_t blkno;
int cnt;
{
int32_t *sump;
int32_t *lp;
u_char *freemapp, *mapp;
int i, start, end, forw, back, map, bit;
if (fs->fs_contigsumsize <= 0)
return;
freemapp = cg_clustersfree(cgp);
sump = cg_clustersum(cgp);
/*
* Allocate or clear the actual block.
*/
if (cnt > 0)
setbit(freemapp, blkno);
else
clrbit(freemapp, blkno);
/*
* Find the size of the cluster going forward.
*/
start = blkno + 1;
end = start + fs->fs_contigsumsize;
if (end >= cgp->cg_nclusterblks)
end = cgp->cg_nclusterblks;
mapp = &freemapp[start / NBBY];
map = *mapp++;
bit = 1 << (start % NBBY);
for (i = start; i < end; i++) {
if ((map & bit) == 0)
break;
if ((i & (NBBY - 1)) != (NBBY - 1)) {
bit <<= 1;
} else {
map = *mapp++;
bit = 1;
}
}
forw = i - start;
/*
* Find the size of the cluster going backward.
*/
start = blkno - 1;
end = start - fs->fs_contigsumsize;
if (end < 0)
end = -1;
mapp = &freemapp[start / NBBY];
map = *mapp--;
bit = 1 << (start % NBBY);
for (i = start; i > end; i--) {
if ((map & bit) == 0)
break;
if ((i & (NBBY - 1)) != 0) {
bit >>= 1;
} else {
map = *mapp--;
bit = 1 << (NBBY - 1);
}
}
back = start - i;
/*
* Account for old cluster and the possibly new forward and
* back clusters.
*/
i = back + forw + 1;
if (i > fs->fs_contigsumsize)
i = fs->fs_contigsumsize;
sump[i] += cnt;
if (back > 0)
sump[back] -= cnt;
if (forw > 0)
sump[forw] -= cnt;
/*
* Update cluster summary information.
*/
lp = &sump[fs->fs_contigsumsize];
for (i = fs->fs_contigsumsize; i > 0; i--)
if (*lp-- > 0)
break;
fs->fs_maxcluster[cgp->cg_cgx] = i;
}
/*
* Fserr prints the name of a filesystem with an error diagnostic.
*
* The form of the error message is:
* fs: error message
*/
static void
ffs_fserr(fs, inum, cp)
struct fs *fs;
ino_t inum;
char *cp;
{
struct thread *td = curthread; /* XXX */
struct proc *p = td->td_proc;
log(LOG_ERR, "pid %d (%s), uid %d inumber %d on %s: %s\n",
p->p_pid, p->p_comm, td->td_ucred->cr_uid, inum, fs->fs_fsmnt, cp);
}
/*
* This function provides the capability for the fsck program to
* update an active filesystem. Six operations are provided:
*
* adjrefcnt(inode, amt) - adjusts the reference count on the
* specified inode by the specified amount. Under normal
* operation the count should always go down. Decrementing
* the count to zero will cause the inode to be freed.
* adjblkcnt(inode, amt) - adjust the number of blocks used to
* by the specifed amount.
* freedirs(inode, count) - directory inodes [inode..inode + count - 1]
* are marked as free. Inodes should never have to be marked
* as in use.
* freefiles(inode, count) - file inodes [inode..inode + count - 1]
* are marked as free. Inodes should never have to be marked
* as in use.
* freeblks(blockno, size) - blocks [blockno..blockno + size - 1]
* are marked as free. Blocks should never have to be marked
* as in use.
* setflags(flags, set/clear) - the fs_flags field has the specified
* flags set (second parameter +1) or cleared (second parameter -1).
*/
static int sysctl_ffs_fsck(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_vfs_ffs, FFS_ADJ_REFCNT, adjrefcnt, CTLFLAG_WR|CTLTYPE_STRUCT,
0, 0, sysctl_ffs_fsck, "S,fsck", "Adjust Inode Reference Count");
SYSCTL_NODE(_vfs_ffs, FFS_ADJ_BLKCNT, adjblkcnt, CTLFLAG_WR,
sysctl_ffs_fsck, "Adjust Inode Used Blocks Count");
SYSCTL_NODE(_vfs_ffs, FFS_DIR_FREE, freedirs, CTLFLAG_WR,
sysctl_ffs_fsck, "Free Range of Directory Inodes");
SYSCTL_NODE(_vfs_ffs, FFS_FILE_FREE, freefiles, CTLFLAG_WR,
sysctl_ffs_fsck, "Free Range of File Inodes");
SYSCTL_NODE(_vfs_ffs, FFS_BLK_FREE, freeblks, CTLFLAG_WR,
sysctl_ffs_fsck, "Free Range of Blocks");
SYSCTL_NODE(_vfs_ffs, FFS_SET_FLAGS, setflags, CTLFLAG_WR,
sysctl_ffs_fsck, "Change Filesystem Flags");
#ifdef DEBUG
static int fsckcmds = 0;
SYSCTL_INT(_debug, OID_AUTO, fsckcmds, CTLFLAG_RW, &fsckcmds, 0, "");
#endif /* DEBUG */
static int
sysctl_ffs_fsck(SYSCTL_HANDLER_ARGS)
{
struct fsck_cmd cmd;
struct ufsmount *ump;
struct vnode *vp;
struct inode *ip;
struct mount *mp;
struct fs *fs;
ufs2_daddr_t blkno;
long blkcnt, blksize;
struct file *fp;
int filetype, error;
if (req->newlen > sizeof cmd)
return (EBADRPC);
if ((error = SYSCTL_IN(req, &cmd, sizeof cmd)) != 0)
return (error);
if (cmd.version != FFS_CMD_VERSION)
return (ERPCMISMATCH);
if ((error = getvnode(curproc->p_fd, cmd.handle, &fp)) != 0)
return (error);
vn_start_write(fp->f_data, &mp, V_WAIT);
if (mp == 0 || strncmp(mp->mnt_stat.f_fstypename, "ufs", MFSNAMELEN)) {
vn_finished_write(mp);
fdrop(fp, curthread);
return (EINVAL);
}
if (mp->mnt_flag & MNT_RDONLY) {
vn_finished_write(mp);
fdrop(fp, curthread);
return (EROFS);
}
ump = VFSTOUFS(mp);
fs = ump->um_fs;
filetype = IFREG;
switch (oidp->oid_number) {
case FFS_SET_FLAGS:
#ifdef DEBUG
if (fsckcmds)
printf("%s: %s flags\n", mp->mnt_stat.f_mntonname,
cmd.size > 0 ? "set" : "clear");
#endif /* DEBUG */
if (cmd.size > 0)
fs->fs_flags |= (long)cmd.value;
else
fs->fs_flags &= ~(long)cmd.value;
break;
case FFS_ADJ_REFCNT:
#ifdef DEBUG
if (fsckcmds) {
printf("%s: adjust inode %jd count by %jd\n",
mp->mnt_stat.f_mntonname, (intmax_t)cmd.value,
(intmax_t)cmd.size);
}
#endif /* DEBUG */
if ((error = VFS_VGET(mp, (ino_t)cmd.value, LK_EXCLUSIVE, &vp)))
break;
ip = VTOI(vp);
ip->i_nlink += cmd.size;
DIP(ip, i_nlink) = ip->i_nlink;
ip->i_effnlink += cmd.size;
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_change_linkcnt(ip);
vput(vp);
break;
case FFS_ADJ_BLKCNT:
#ifdef DEBUG
if (fsckcmds) {
printf("%s: adjust inode %jd block count by %jd\n",
mp->mnt_stat.f_mntonname, (intmax_t)cmd.value,
(intmax_t)cmd.size);
}
#endif /* DEBUG */
if ((error = VFS_VGET(mp, (ino_t)cmd.value, LK_EXCLUSIVE, &vp)))
break;
ip = VTOI(vp);
DIP(ip, i_blocks) += cmd.size;
ip->i_flag |= IN_CHANGE;
vput(vp);
break;
case FFS_DIR_FREE:
filetype = IFDIR;
/* fall through */
case FFS_FILE_FREE:
#ifdef DEBUG
if (fsckcmds) {
if (cmd.size == 1)
printf("%s: free %s inode %d\n",
mp->mnt_stat.f_mntonname,
filetype == IFDIR ? "directory" : "file",
(ino_t)cmd.value);
else
printf("%s: free %s inodes %d-%d\n",
mp->mnt_stat.f_mntonname,
filetype == IFDIR ? "directory" : "file",
(ino_t)cmd.value,
(ino_t)(cmd.value + cmd.size - 1));
}
#endif /* DEBUG */
while (cmd.size > 0) {
if ((error = ffs_freefile(fs, ump->um_devvp, cmd.value,
filetype)))
break;
cmd.size -= 1;
cmd.value += 1;
}
break;
case FFS_BLK_FREE:
#ifdef DEBUG
if (fsckcmds) {
if (cmd.size == 1)
printf("%s: free block %jd\n",
mp->mnt_stat.f_mntonname,
(intmax_t)cmd.value);
else
printf("%s: free blocks %jd-%jd\n",
mp->mnt_stat.f_mntonname,
(intmax_t)cmd.value,
(intmax_t)cmd.value + cmd.size - 1);
}
#endif /* DEBUG */
blkno = cmd.value;
blkcnt = cmd.size;
blksize = fs->fs_frag - (blkno % fs->fs_frag);
while (blkcnt > 0) {
if (blksize > blkcnt)
blksize = blkcnt;
ffs_blkfree(fs, ump->um_devvp, blkno,
blksize * fs->fs_fsize, ROOTINO);
blkno += blksize;
blkcnt -= blksize;
blksize = fs->fs_frag;
}
break;
default:
#ifdef DEBUG
if (fsckcmds) {
printf("Invalid request %d from fsck\n",
oidp->oid_number);
}
#endif /* DEBUG */
error = EINVAL;
break;
}
fdrop(fp, curthread);
vn_finished_write(mp);
return (error);
}
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