34c278f970
to not return without setting a return value when it can't read a block error or detects a bad cylinder group, since the caller is expecting a return value. It will now panic at this point, since the thing to do in this case would be to return a "bad block" status to the caller, and the caller will panic anyways when that happens. Also updated to panic strings in this routine to read "ffs_checkblk: ..." instead of "checkblk: ...".
1640 lines
44 KiB
C
1640 lines
44 KiB
C
/*
|
|
* 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
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_quota.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.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 <vm/vm.h>
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ufs/ufs_extern.h>
|
|
|
|
#include <ufs/ffs/fs.h>
|
|
#include <ufs/ffs/ffs_extern.h>
|
|
|
|
extern u_long nextgennumber;
|
|
|
|
typedef ufs_daddr_t allocfcn_t __P((struct inode *ip, int cg, ufs_daddr_t bpref,
|
|
int size));
|
|
|
|
static ufs_daddr_t ffs_alloccg __P((struct inode *, int, ufs_daddr_t, int));
|
|
static ufs_daddr_t ffs_alloccgblk __P((struct fs *, struct cg *, ufs_daddr_t));
|
|
static void ffs_clusteracct __P((struct fs *, struct cg *, ufs_daddr_t,
|
|
int));
|
|
static ufs_daddr_t ffs_clusteralloc __P((struct inode *, int, ufs_daddr_t,
|
|
int));
|
|
static ino_t ffs_dirpref __P((struct fs *));
|
|
static ufs_daddr_t ffs_fragextend __P((struct inode *, int, long, int, int));
|
|
static void ffs_fserr __P((struct fs *, u_int, char *));
|
|
static u_long ffs_hashalloc
|
|
__P((struct inode *, int, long, int, allocfcn_t *));
|
|
static ino_t ffs_nodealloccg __P((struct inode *, int, ufs_daddr_t, int));
|
|
static ufs_daddr_t ffs_mapsearch __P((struct fs *, struct cg *, ufs_daddr_t,
|
|
int));
|
|
|
|
/*
|
|
* Allocate a block in the file system.
|
|
*
|
|
* 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)
|
|
register struct inode *ip;
|
|
ufs_daddr_t lbn, bpref;
|
|
int size;
|
|
struct ucred *cred;
|
|
ufs_daddr_t *bnp;
|
|
{
|
|
register struct fs *fs;
|
|
ufs_daddr_t bno;
|
|
int cg;
|
|
#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 = 0x%lx, bsize = %ld, size = %d, fs = %s\n",
|
|
(u_long)ip->i_dev, fs->fs_bsize, size, fs->fs_fsmnt);
|
|
panic("ffs_alloc: bad size");
|
|
}
|
|
if (cred == NOCRED)
|
|
panic("ffs_alloc: missing credential");
|
|
#endif /* DIAGNOSTIC */
|
|
if (size == fs->fs_bsize && fs->fs_cstotal.cs_nbfree == 0)
|
|
goto nospace;
|
|
if (cred->cr_uid != 0 && freespace(fs, fs->fs_minfree) <= 0)
|
|
goto nospace;
|
|
#ifdef QUOTA
|
|
error = chkdq(ip, (long)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 = (ufs_daddr_t)ffs_hashalloc(ip, cg, (long)bpref, size,
|
|
ffs_alloccg);
|
|
if (bno > 0) {
|
|
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, (long)-btodb(size), cred, FORCE);
|
|
#endif
|
|
nospace:
|
|
ffs_fserr(fs, cred->cr_uid, "file system full");
|
|
uprintf("\n%s: write failed, file system 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, bpref, osize, nsize, cred, bpp)
|
|
register struct inode *ip;
|
|
ufs_daddr_t lbprev;
|
|
ufs_daddr_t bpref;
|
|
int osize, nsize;
|
|
struct ucred *cred;
|
|
struct buf **bpp;
|
|
{
|
|
register struct fs *fs;
|
|
struct buf *bp;
|
|
int cg, request, error;
|
|
ufs_daddr_t bprev, bno;
|
|
|
|
*bpp = 0;
|
|
fs = ip->i_fs;
|
|
#ifdef DIAGNOSTIC
|
|
if ((u_int)osize > fs->fs_bsize || fragoff(fs, osize) != 0 ||
|
|
(u_int)nsize > fs->fs_bsize || fragoff(fs, nsize) != 0) {
|
|
printf(
|
|
"dev = 0x%lx, bsize = %ld, osize = %d, "
|
|
"nsize = %d, fs = %s\n",
|
|
(u_long)ip->i_dev, fs->fs_bsize, osize,
|
|
nsize, fs->fs_fsmnt);
|
|
panic("ffs_realloccg: bad size");
|
|
}
|
|
if (cred == NOCRED)
|
|
panic("ffs_realloccg: missing credential");
|
|
#endif /* DIAGNOSTIC */
|
|
if (cred->cr_uid != 0 && freespace(fs, fs->fs_minfree) <= 0)
|
|
goto nospace;
|
|
if ((bprev = ip->i_db[lbprev]) == 0) {
|
|
printf("dev = 0x%lx, bsize = %ld, bprev = %ld, fs = %s\n",
|
|
(u_long) ip->i_dev, fs->fs_bsize, bprev, fs->fs_fsmnt);
|
|
panic("ffs_realloccg: bad bprev");
|
|
}
|
|
/*
|
|
* Allocate the extra space in the buffer.
|
|
*/
|
|
error = bread(ITOV(ip), 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, (long)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, (long)bprev, osize, nsize);
|
|
if (bno) {
|
|
if (bp->b_blkno != fsbtodb(fs, bno))
|
|
panic("bad blockno");
|
|
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 >
|
|
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 <
|
|
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 = 0x%lx, optim = %ld, fs = %s\n",
|
|
(u_long)ip->i_dev, fs->fs_optim, fs->fs_fsmnt);
|
|
panic("ffs_realloccg: bad optim");
|
|
/* NOTREACHED */
|
|
}
|
|
bno = (ufs_daddr_t)ffs_hashalloc(ip, cg, (long)bpref, request,
|
|
ffs_alloccg);
|
|
if (bno > 0) {
|
|
bp->b_blkno = fsbtodb(fs, bno);
|
|
ffs_blkfree(ip, bprev, (long)osize);
|
|
if (nsize < request)
|
|
ffs_blkfree(ip, bno + numfrags(fs, nsize),
|
|
(long)(request - nsize));
|
|
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, (long)-btodb(nsize - osize), cred, FORCE);
|
|
#endif
|
|
brelse(bp);
|
|
nospace:
|
|
/*
|
|
* no space available
|
|
*/
|
|
ffs_fserr(fs, cred->cr_uid, "file system full");
|
|
uprintf("\n%s: write failed, file system 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 to
|
|
* an fs_rotdelay offset from the end of the allocation for the logical
|
|
* block immediately preceeding 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.
|
|
*/
|
|
static int doasyncfree = 1;
|
|
SYSCTL_INT(_vfs_ffs, FFS_ASYNCFREE, doasyncfree, CTLFLAG_RW, &doasyncfree, 0, "");
|
|
|
|
int doreallocblks = 1;
|
|
SYSCTL_INT(_vfs_ffs, FFS_REALLOCBLKS, doreallocblks, CTLFLAG_RW, &doreallocblks, 0, "");
|
|
|
|
static int prtrealloc = 0;
|
|
|
|
int
|
|
ffs_reallocblks(ap)
|
|
struct vop_reallocblks_args /* {
|
|
struct vnode *a_vp;
|
|
struct cluster_save *a_buflist;
|
|
} */ *ap;
|
|
{
|
|
#if !defined (not_yes)
|
|
return (ENOSPC);
|
|
#else
|
|
struct fs *fs;
|
|
struct inode *ip;
|
|
struct vnode *vp;
|
|
struct buf *sbp, *ebp;
|
|
ufs_daddr_t *bap, *sbap, *ebap = 0;
|
|
struct cluster_save *buflist;
|
|
ufs_daddr_t start_lbn, end_lbn, soff, newblk, blkno;
|
|
struct indir start_ap[NIADDR + 1], end_ap[NIADDR + 1], *idp;
|
|
int i, len, start_lvl, end_lvl, pref, ssize;
|
|
struct timeval tv;
|
|
|
|
if (doreallocblks == 0)
|
|
return (ENOSPC);
|
|
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_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 = (ufs_daddr_t *)sbp->b_data;
|
|
soff = idp->in_off;
|
|
}
|
|
/*
|
|
* Find the preferred location for the cluster.
|
|
*/
|
|
pref = ffs_blkpref(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 = (ufs_daddr_t *)ebp->b_data;
|
|
}
|
|
/*
|
|
* Search the block map looking for an allocation of the desired size.
|
|
*/
|
|
if ((newblk = (ufs_daddr_t)ffs_hashalloc(ip, dtog(fs, pref), (long)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 %d-%d\n\told:", ip->i_number,
|
|
start_lbn, end_lbn);
|
|
#endif
|
|
blkno = newblk;
|
|
for (bap = &sbap[soff], i = 0; i < len; i++, blkno += fs->fs_frag) {
|
|
if (i == ssize)
|
|
bap = ebap;
|
|
#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
|
|
*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_db[0]) {
|
|
if (doasyncfree)
|
|
bdwrite(sbp);
|
|
else
|
|
bwrite(sbp);
|
|
} else {
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
if (!doasyncfree) {
|
|
tv = time;
|
|
VOP_UPDATE(vp, &tv, &tv, 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) {
|
|
ffs_blkfree(ip, dbtofsb(fs, buflist->bs_children[i]->b_blkno),
|
|
fs->fs_bsize);
|
|
buflist->bs_children[i]->b_blkno = fsbtodb(fs, blkno);
|
|
#ifdef DEBUG
|
|
if (!ffs_checkblk(ip,
|
|
dbtofsb(fs, buflist->bs_children[i]->b_blkno), fs->fs_bsize))
|
|
panic("ffs_reallocblks: unallocated block 3");
|
|
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_db[0])
|
|
brelse(sbp);
|
|
return (ENOSPC);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Allocate an inode in the file system.
|
|
*
|
|
* 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(ap)
|
|
struct vop_valloc_args /* {
|
|
struct vnode *a_pvp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct vnode **a_vpp;
|
|
} */ *ap;
|
|
{
|
|
register struct vnode *pvp = ap->a_pvp;
|
|
register struct inode *pip;
|
|
register struct fs *fs;
|
|
register struct inode *ip;
|
|
mode_t mode = ap->a_mode;
|
|
ino_t ino, ipref;
|
|
int cg, error;
|
|
|
|
*ap->a_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(fs);
|
|
else
|
|
ipref = pip->i_number;
|
|
if (ipref >= fs->fs_ncg * fs->fs_ipg)
|
|
ipref = 0;
|
|
cg = ino_to_cg(fs, ipref);
|
|
ino = (ino_t)ffs_hashalloc(pip, cg, (long)ipref, mode,
|
|
(allocfcn_t *)ffs_nodealloccg);
|
|
if (ino == 0)
|
|
goto noinodes;
|
|
error = VFS_VGET(pvp->v_mount, ino, ap->a_vpp);
|
|
if (error) {
|
|
VOP_VFREE(pvp, ino, mode);
|
|
return (error);
|
|
}
|
|
ip = VTOI(*ap->a_vpp);
|
|
if (ip->i_mode) {
|
|
printf("mode = 0%o, inum = %ld, fs = %s\n",
|
|
ip->i_mode, ip->i_number, fs->fs_fsmnt);
|
|
panic("ffs_valloc: dup alloc");
|
|
}
|
|
if (ip->i_blocks) { /* XXX */
|
|
printf("free inode %s/%ld had %ld blocks\n",
|
|
fs->fs_fsmnt, ino, ip->i_blocks);
|
|
ip->i_blocks = 0;
|
|
}
|
|
ip->i_flags = 0;
|
|
/*
|
|
* Set up a new generation number for this inode.
|
|
*/
|
|
if (++nextgennumber < (u_long)time.tv_sec)
|
|
nextgennumber = time.tv_sec;
|
|
ip->i_gen = nextgennumber;
|
|
return (0);
|
|
noinodes:
|
|
ffs_fserr(fs, ap->a_cred->cr_uid, "out of inodes");
|
|
uprintf("\n%s: create/symlink failed, no inodes free\n", fs->fs_fsmnt);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
/*
|
|
* Find a cylinder to place a directory.
|
|
*
|
|
* The policy implemented by this algorithm is to select from
|
|
* among those cylinder groups with above the average number of
|
|
* free inodes, the one with the smallest number of directories.
|
|
*/
|
|
static ino_t
|
|
ffs_dirpref(fs)
|
|
register struct fs *fs;
|
|
{
|
|
int cg, minndir, mincg, avgifree;
|
|
|
|
avgifree = fs->fs_cstotal.cs_nifree / fs->fs_ncg;
|
|
minndir = fs->fs_ipg;
|
|
mincg = 0;
|
|
for (cg = 0; cg < fs->fs_ncg; cg++)
|
|
if (fs->fs_cs(fs, cg).cs_ndir < minndir &&
|
|
fs->fs_cs(fs, cg).cs_nifree >= avgifree) {
|
|
mincg = cg;
|
|
minndir = fs->fs_cs(fs, cg).cs_ndir;
|
|
}
|
|
return ((ino_t)(fs->fs_ipg * mincg));
|
|
}
|
|
|
|
/*
|
|
* 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 physically separated
|
|
* so that the disk head will be in transit between them for at least
|
|
* fs_rotdelay milliseconds. This is to allow time for the processor to
|
|
* schedule another I/O transfer.
|
|
*/
|
|
ufs_daddr_t
|
|
ffs_blkpref(ip, lbn, indx, bap)
|
|
struct inode *ip;
|
|
ufs_daddr_t lbn;
|
|
int indx;
|
|
ufs_daddr_t *bap;
|
|
{
|
|
register struct fs *fs;
|
|
register int cg;
|
|
int avgbfree, startcg;
|
|
ufs_daddr_t nextblk;
|
|
|
|
fs = ip->i_fs;
|
|
if (indx % fs->fs_maxbpg == 0 || bap[indx - 1] == 0) {
|
|
if (lbn < NDADDR) {
|
|
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);
|
|
}
|
|
/*
|
|
* One or more previous blocks have been laid out. If less
|
|
* than fs_maxcontig previous blocks are contiguous, the
|
|
* next block is requested contiguously, otherwise it is
|
|
* requested rotationally delayed by fs_rotdelay milliseconds.
|
|
*/
|
|
nextblk = bap[indx - 1] + fs->fs_frag;
|
|
if (fs->fs_rotdelay == 0 || indx < fs->fs_maxcontig ||
|
|
bap[indx - fs->fs_maxcontig] +
|
|
blkstofrags(fs, fs->fs_maxcontig) != nextblk)
|
|
return (nextblk);
|
|
/*
|
|
* Here we convert ms of delay to frags as:
|
|
* (frags) = (ms) * (rev/sec) * (sect/rev) /
|
|
* ((sect/frag) * (ms/sec))
|
|
* then round up to the next block.
|
|
*/
|
|
nextblk += roundup(fs->fs_rotdelay * fs->fs_rps * fs->fs_nsect /
|
|
(NSPF(fs) * 1000), fs->fs_frag);
|
|
return (nextblk);
|
|
}
|
|
|
|
/*
|
|
* 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 u_long
|
|
ffs_hashalloc(ip, cg, pref, size, allocator)
|
|
struct inode *ip;
|
|
int cg;
|
|
long pref;
|
|
int size; /* size for data blocks, mode for inodes */
|
|
allocfcn_t *allocator;
|
|
{
|
|
register struct fs *fs;
|
|
long result; /* XXX why not same type as we return? */
|
|
int i, icg = cg;
|
|
|
|
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 ufs_daddr_t
|
|
ffs_fragextend(ip, cg, bprev, osize, nsize)
|
|
struct inode *ip;
|
|
int cg;
|
|
long bprev;
|
|
int osize, nsize;
|
|
{
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
struct buf *bp;
|
|
long bno;
|
|
int frags, bbase;
|
|
int i, error;
|
|
|
|
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);
|
|
}
|
|
cgp->cg_time = time.tv_sec;
|
|
bno = dtogd(fs, bprev);
|
|
for (i = numfrags(fs, osize); i < frags; i++)
|
|
if (isclr(cg_blksfree(cgp), 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(cg_blksfree(cgp), 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(cg_blksfree(cgp), bno + i);
|
|
cgp->cg_cs.cs_nffree--;
|
|
fs->fs_cstotal.cs_nffree--;
|
|
fs->fs_cs(fs, cg).cs_nffree--;
|
|
}
|
|
fs->fs_fmod = 1;
|
|
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 ufs_daddr_t
|
|
ffs_alloccg(ip, cg, bpref, size)
|
|
struct inode *ip;
|
|
int cg;
|
|
ufs_daddr_t bpref;
|
|
int size;
|
|
{
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
struct buf *bp;
|
|
register int i;
|
|
int error, bno, frags, allocsiz;
|
|
|
|
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);
|
|
}
|
|
cgp->cg_time = time.tv_sec;
|
|
if (size == fs->fs_bsize) {
|
|
bno = ffs_alloccgblk(fs, cgp, bpref);
|
|
bdwrite(bp);
|
|
return (bno);
|
|
}
|
|
/*
|
|
* 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
|
|
*/
|
|
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);
|
|
}
|
|
bno = ffs_alloccgblk(fs, cgp, bpref);
|
|
bpref = dtogd(fs, bno);
|
|
for (i = frags; i < fs->fs_frag; i++)
|
|
setbit(cg_blksfree(cgp), bpref + 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]++;
|
|
bdwrite(bp);
|
|
return (bno);
|
|
}
|
|
bno = ffs_mapsearch(fs, cgp, bpref, allocsiz);
|
|
if (bno < 0) {
|
|
brelse(bp);
|
|
return (0);
|
|
}
|
|
for (i = 0; i < frags; i++)
|
|
clrbit(cg_blksfree(cgp), 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]++;
|
|
bdwrite(bp);
|
|
return (cg * fs->fs_fpg + bno);
|
|
}
|
|
|
|
/*
|
|
* 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 ufs_daddr_t
|
|
ffs_alloccgblk(fs, cgp, bpref)
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
ufs_daddr_t bpref;
|
|
{
|
|
ufs_daddr_t bno, blkno;
|
|
int cylno, pos, delta;
|
|
short *cylbp;
|
|
register int i;
|
|
|
|
if (bpref == 0 || dtog(fs, bpref) != cgp->cg_cgx) {
|
|
bpref = cgp->cg_rotor;
|
|
goto norot;
|
|
}
|
|
bpref = blknum(fs, bpref);
|
|
bpref = dtogd(fs, bpref);
|
|
/*
|
|
* if the requested block is available, use it
|
|
*/
|
|
if (ffs_isblock(fs, cg_blksfree(cgp), fragstoblks(fs, bpref))) {
|
|
bno = bpref;
|
|
goto gotit;
|
|
}
|
|
if (fs->fs_nrpos <= 1 || fs->fs_cpc == 0) {
|
|
/*
|
|
* Block layout information is not available.
|
|
* Leaving bpref unchanged means we take the
|
|
* next available free block following the one
|
|
* we just allocated. Hopefully this will at
|
|
* least hit a track cache on drives of unknown
|
|
* geometry (e.g. SCSI).
|
|
*/
|
|
goto norot;
|
|
}
|
|
/*
|
|
* check for a block available on the same cylinder
|
|
*/
|
|
cylno = cbtocylno(fs, bpref);
|
|
if (cg_blktot(cgp)[cylno] == 0)
|
|
goto norot;
|
|
/*
|
|
* check the summary information to see if a block is
|
|
* available in the requested cylinder starting at the
|
|
* requested rotational position and proceeding around.
|
|
*/
|
|
cylbp = cg_blks(fs, cgp, cylno);
|
|
pos = cbtorpos(fs, bpref);
|
|
for (i = pos; i < fs->fs_nrpos; i++)
|
|
if (cylbp[i] > 0)
|
|
break;
|
|
if (i == fs->fs_nrpos)
|
|
for (i = 0; i < pos; i++)
|
|
if (cylbp[i] > 0)
|
|
break;
|
|
if (cylbp[i] > 0) {
|
|
/*
|
|
* found a rotational position, now find the actual
|
|
* block. A panic if none is actually there.
|
|
*/
|
|
pos = cylno % fs->fs_cpc;
|
|
bno = (cylno - pos) * fs->fs_spc / NSPB(fs);
|
|
if (fs_postbl(fs, pos)[i] == -1) {
|
|
printf("pos = %d, i = %d, fs = %s\n",
|
|
pos, i, fs->fs_fsmnt);
|
|
panic("ffs_alloccgblk: cyl groups corrupted");
|
|
}
|
|
for (i = fs_postbl(fs, pos)[i];; ) {
|
|
if (ffs_isblock(fs, cg_blksfree(cgp), bno + i)) {
|
|
bno = blkstofrags(fs, (bno + i));
|
|
goto gotit;
|
|
}
|
|
delta = fs_rotbl(fs)[i];
|
|
if (delta <= 0 ||
|
|
delta + i > fragstoblks(fs, fs->fs_fpg))
|
|
break;
|
|
i += delta;
|
|
}
|
|
printf("pos = %d, i = %d, fs = %s\n", pos, i, fs->fs_fsmnt);
|
|
panic("ffs_alloccgblk: can't find blk in cyl");
|
|
}
|
|
norot:
|
|
/*
|
|
* no blocks in the requested cylinder, so take next
|
|
* available one 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, cg_blksfree(cgp), (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--;
|
|
cylno = cbtocylno(fs, bno);
|
|
cg_blks(fs, cgp, cylno)[cbtorpos(fs, bno)]--;
|
|
cg_blktot(cgp)[cylno]--;
|
|
fs->fs_fmod = 1;
|
|
return (cgp->cg_cgx * fs->fs_fpg + bno);
|
|
}
|
|
|
|
#ifdef notyet
|
|
/*
|
|
* 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 ufs_daddr_t
|
|
ffs_clusteralloc(ip, cg, bpref, len)
|
|
struct inode *ip;
|
|
int cg;
|
|
ufs_daddr_t bpref;
|
|
int len;
|
|
{
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
struct buf *bp;
|
|
int i, got, run, bno, bit, map;
|
|
u_char *mapp;
|
|
int32_t *lp;
|
|
|
|
fs = ip->i_fs;
|
|
if (fs->fs_maxcluster[cg] < len)
|
|
return (NULL);
|
|
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;
|
|
/*
|
|
* 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.
|
|
*/
|
|
for (i = 1; i <= len; i++)
|
|
if (!ffs_isblock(fs, cg_blksfree(cgp), 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 ((got = ffs_alloccgblk(fs, cgp, bno + i)) != bno + i)
|
|
panic("ffs_clusteralloc: lost block");
|
|
bdwrite(bp);
|
|
return (bno);
|
|
|
|
fail:
|
|
brelse(bp);
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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 ino_t
|
|
ffs_nodealloccg(ip, cg, ipref, mode)
|
|
struct inode *ip;
|
|
int cg;
|
|
ufs_daddr_t ipref;
|
|
int mode;
|
|
{
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
struct buf *bp;
|
|
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);
|
|
}
|
|
cgp->cg_time = time.tv_sec;
|
|
if (ipref) {
|
|
ipref %= fs->fs_ipg;
|
|
if (isclr(cg_inosused(cgp), ipref))
|
|
goto gotit;
|
|
}
|
|
start = cgp->cg_irotor / NBBY;
|
|
len = howmany(fs->fs_ipg - cgp->cg_irotor, NBBY);
|
|
loc = skpc(0xff, len, &cg_inosused(cgp)[start]);
|
|
if (loc == 0) {
|
|
len = start + 1;
|
|
start = 0;
|
|
loc = skpc(0xff, len, &cg_inosused(cgp)[0]);
|
|
if (loc == 0) {
|
|
printf("cg = %d, irotor = %ld, fs = %s\n",
|
|
cg, cgp->cg_irotor, fs->fs_fsmnt);
|
|
panic("ffs_nodealloccg: map corrupted");
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
i = start + len - loc;
|
|
map = cg_inosused(cgp)[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:
|
|
setbit(cg_inosused(cgp), 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++;
|
|
}
|
|
bdwrite(bp);
|
|
return (cg * fs->fs_ipg + ipref);
|
|
}
|
|
|
|
/*
|
|
* 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(ip, bno, size)
|
|
register struct inode *ip;
|
|
ufs_daddr_t bno;
|
|
long size;
|
|
{
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
struct buf *bp;
|
|
ufs_daddr_t blkno;
|
|
int i, error, cg, blk, frags, bbase;
|
|
|
|
fs = ip->i_fs;
|
|
if ((u_int)size > fs->fs_bsize || fragoff(fs, size) != 0) {
|
|
printf("dev = 0x%lx, bsize = %ld, size = %ld, fs = %s\n",
|
|
(u_long)ip->i_dev, fs->fs_bsize, size, fs->fs_fsmnt);
|
|
panic("blkfree: bad size");
|
|
}
|
|
cg = dtog(fs, bno);
|
|
if ((u_int)bno >= fs->fs_size) {
|
|
printf("bad block %ld, ino %ld\n", bno, ip->i_number);
|
|
ffs_fserr(fs, ip->i_uid, "bad block");
|
|
return;
|
|
}
|
|
error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)),
|
|
(int)fs->fs_cgsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return;
|
|
}
|
|
cgp = (struct cg *)bp->b_data;
|
|
if (!cg_chkmagic(cgp)) {
|
|
brelse(bp);
|
|
return;
|
|
}
|
|
cgp->cg_time = time.tv_sec;
|
|
bno = dtogd(fs, bno);
|
|
if (size == fs->fs_bsize) {
|
|
blkno = fragstoblks(fs, bno);
|
|
if (ffs_isblock(fs, cg_blksfree(cgp), blkno)) {
|
|
printf("dev = 0x%lx, block = %ld, fs = %s\n",
|
|
(u_long) ip->i_dev, bno, fs->fs_fsmnt);
|
|
panic("blkfree: freeing free block");
|
|
}
|
|
ffs_setblock(fs, cg_blksfree(cgp), blkno);
|
|
ffs_clusteracct(fs, cgp, blkno, 1);
|
|
cgp->cg_cs.cs_nbfree++;
|
|
fs->fs_cstotal.cs_nbfree++;
|
|
fs->fs_cs(fs, cg).cs_nbfree++;
|
|
i = cbtocylno(fs, bno);
|
|
cg_blks(fs, cgp, i)[cbtorpos(fs, bno)]++;
|
|
cg_blktot(cgp)[i]++;
|
|
} else {
|
|
bbase = bno - fragnum(fs, bno);
|
|
/*
|
|
* decrement the counts associated with the old frags
|
|
*/
|
|
blk = blkmap(fs, cg_blksfree(cgp), bbase);
|
|
ffs_fragacct(fs, blk, cgp->cg_frsum, -1);
|
|
/*
|
|
* deallocate the fragment
|
|
*/
|
|
frags = numfrags(fs, size);
|
|
for (i = 0; i < frags; i++) {
|
|
if (isset(cg_blksfree(cgp), bno + i)) {
|
|
printf("dev = 0x%lx, block = %ld, fs = %s\n",
|
|
(u_long) ip->i_dev, bno + i, fs->fs_fsmnt);
|
|
panic("blkfree: freeing free frag");
|
|
}
|
|
setbit(cg_blksfree(cgp), bno + 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, cg_blksfree(cgp), bbase);
|
|
ffs_fragacct(fs, blk, cgp->cg_frsum, 1);
|
|
/*
|
|
* if a complete block has been reassembled, account for it
|
|
*/
|
|
blkno = fragstoblks(fs, bbase);
|
|
if (ffs_isblock(fs, cg_blksfree(cgp), blkno)) {
|
|
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, blkno, 1);
|
|
cgp->cg_cs.cs_nbfree++;
|
|
fs->fs_cstotal.cs_nbfree++;
|
|
fs->fs_cs(fs, cg).cs_nbfree++;
|
|
i = cbtocylno(fs, bbase);
|
|
cg_blks(fs, cgp, i)[cbtorpos(fs, bbase)]++;
|
|
cg_blktot(cgp)[i]++;
|
|
}
|
|
}
|
|
fs->fs_fmod = 1;
|
|
bdwrite(bp);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* Verify allocation of a block or fragment. Returns true if block or
|
|
* fragment is allocated, false if it is free.
|
|
*/
|
|
int
|
|
ffs_checkblk(ip, bno, size)
|
|
struct inode *ip;
|
|
ufs_daddr_t bno;
|
|
long size;
|
|
{
|
|
struct fs *fs;
|
|
struct cg *cgp;
|
|
struct buf *bp;
|
|
int i, error, frags, free;
|
|
|
|
fs = ip->i_fs;
|
|
if ((u_int)size > fs->fs_bsize || fragoff(fs, size) != 0) {
|
|
printf("bsize = %d, size = %d, fs = %s\n",
|
|
fs->fs_bsize, size, fs->fs_fsmnt);
|
|
panic("ffs_checkblk: bad size");
|
|
}
|
|
if ((u_int)bno >= fs->fs_size)
|
|
panic("ffs_checkblk: bad block %d", 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");
|
|
bno = dtogd(fs, bno);
|
|
if (size == fs->fs_bsize) {
|
|
free = ffs_isblock(fs, cg_blksfree(cgp), fragstoblks(fs, bno));
|
|
} else {
|
|
frags = numfrags(fs, size);
|
|
for (free = 0, i = 0; i < frags; i++)
|
|
if (isset(cg_blksfree(cgp), bno + i))
|
|
free++;
|
|
if (free != 0 && free != frags)
|
|
panic("ffs_checkblk: partially free fragment");
|
|
}
|
|
brelse(bp);
|
|
return (!free);
|
|
}
|
|
#endif /* DIAGNOSTIC */
|
|
|
|
/*
|
|
* Free an inode.
|
|
*
|
|
* The specified inode is placed back in the free map.
|
|
*/
|
|
int
|
|
ffs_vfree(ap)
|
|
struct vop_vfree_args /* {
|
|
struct vnode *a_pvp;
|
|
ino_t a_ino;
|
|
int a_mode;
|
|
} */ *ap;
|
|
{
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
register struct inode *pip;
|
|
ino_t ino = ap->a_ino;
|
|
struct buf *bp;
|
|
int error, cg;
|
|
|
|
pip = VTOI(ap->a_pvp);
|
|
fs = pip->i_fs;
|
|
if ((u_int)ino >= fs->fs_ipg * fs->fs_ncg)
|
|
panic("ifree: range: dev = 0x%x, ino = %d, fs = %s",
|
|
pip->i_dev, ino, fs->fs_fsmnt);
|
|
cg = ino_to_cg(fs, ino);
|
|
error = bread(pip->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);
|
|
}
|
|
cgp->cg_time = time.tv_sec;
|
|
ino %= fs->fs_ipg;
|
|
if (isclr(cg_inosused(cgp), ino)) {
|
|
printf("dev = 0x%lx, ino = %ld, fs = %s\n",
|
|
(u_long)pip->i_dev, ino, fs->fs_fsmnt);
|
|
if (fs->fs_ronly == 0)
|
|
panic("ifree: freeing free inode");
|
|
}
|
|
clrbit(cg_inosused(cgp), 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 ((ap->a_mode & IFMT) == IFDIR) {
|
|
cgp->cg_cs.cs_ndir--;
|
|
fs->fs_cstotal.cs_ndir--;
|
|
fs->fs_cs(fs, cg).cs_ndir--;
|
|
}
|
|
fs->fs_fmod = 1;
|
|
bdwrite(bp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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 ufs_daddr_t
|
|
ffs_mapsearch(fs, cgp, bpref, allocsiz)
|
|
register struct fs *fs;
|
|
register struct cg *cgp;
|
|
ufs_daddr_t bpref;
|
|
int allocsiz;
|
|
{
|
|
ufs_daddr_t bno;
|
|
int start, len, loc, i;
|
|
int blk, field, subfield, pos;
|
|
|
|
/*
|
|
* 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;
|
|
len = howmany(fs->fs_fpg, NBBY) - start;
|
|
loc = scanc((u_int)len, (u_char *)&cg_blksfree(cgp)[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 *)&cg_blksfree(cgp)[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, cg_blksfree(cgp), 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.
|
|
*/
|
|
static void
|
|
ffs_clusteracct(fs, cgp, blkno, cnt)
|
|
struct fs *fs;
|
|
struct cg *cgp;
|
|
ufs_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 file system with an error diagnostic.
|
|
*
|
|
* The form of the error message is:
|
|
* fs: error message
|
|
*/
|
|
static void
|
|
ffs_fserr(fs, uid, cp)
|
|
struct fs *fs;
|
|
u_int uid;
|
|
char *cp;
|
|
{
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
log(LOG_ERR, "pid %d (%s), uid %d on %s: %s\n", p ? p->p_pid : -1,
|
|
p ? p->p_comm : "-", uid, fs->fs_fsmnt, cp);
|
|
}
|