70097aac13
Add definitions for e2fs_daddr_t, e4fs_daddr_t in addition to the already existing e2fs_lbn_t and adjust them for ext4. Other than making the code more readable these changes should fix problems related to big filesystems. Setting the proper types can be tricky so the process was helped by looking at UFS. In our implementation, logical block numbers can be negative and the code depends on it. In ext2, block numbers are unsigned so it is convenient to keep e2fs_daddr_t unsigned and use the complete 32 bits. In the case of e4fs_daddr_t, while the value should be unsigned, for ext4 we only need to support 48 bits so preserving an extra bit from the sign is not an issue. While here also drop the ext2_setblock() prototype that was never used. Discussed with: mckusick, bde MFC after: 3 weeks
297 lines
7.9 KiB
C
297 lines
7.9 KiB
C
/*-
|
|
* modified for Lites 1.1
|
|
*
|
|
* Aug 1995, Godmar Back (gback@cs.utah.edu)
|
|
* University of Utah, Department of Computer Science
|
|
*/
|
|
/*-
|
|
* 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.
|
|
* 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_balloc.c 8.4 (Berkeley) 9/23/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <fs/ext2fs/fs.h>
|
|
#include <fs/ext2fs/inode.h>
|
|
#include <fs/ext2fs/ext2fs.h>
|
|
#include <fs/ext2fs/ext2_dinode.h>
|
|
#include <fs/ext2fs/ext2_extern.h>
|
|
#include <fs/ext2fs/ext2_mount.h>
|
|
|
|
/*
|
|
* Balloc defines the structure of filesystem storage
|
|
* by allocating the physical blocks on a device given
|
|
* the inode and the logical block number in a file.
|
|
*/
|
|
int
|
|
ext2_balloc(struct inode *ip, e2fs_lbn_t lbn, int size, struct ucred *cred,
|
|
struct buf **bpp, int flags)
|
|
{
|
|
struct m_ext2fs *fs;
|
|
struct ext2mount *ump;
|
|
struct buf *bp, *nbp;
|
|
struct vnode *vp = ITOV(ip);
|
|
struct indir indirs[NIADDR + 2];
|
|
e4fs_daddr_t nb, newb;
|
|
e2fs_daddr_t *bap, pref;
|
|
int osize, nsize, num, i, error;
|
|
|
|
*bpp = NULL;
|
|
if (lbn < 0)
|
|
return (EFBIG);
|
|
fs = ip->i_e2fs;
|
|
ump = ip->i_ump;
|
|
|
|
/*
|
|
* check if this is a sequential block allocation.
|
|
* If so, increment next_alloc fields to allow ext2_blkpref
|
|
* to make a good guess
|
|
*/
|
|
if (lbn == ip->i_next_alloc_block + 1) {
|
|
ip->i_next_alloc_block++;
|
|
ip->i_next_alloc_goal++;
|
|
}
|
|
|
|
/*
|
|
* The first NDADDR blocks are direct blocks
|
|
*/
|
|
if (lbn < NDADDR) {
|
|
nb = ip->i_db[lbn];
|
|
/* no new block is to be allocated, and no need to expand
|
|
the file */
|
|
if (nb != 0 && ip->i_size >= (lbn + 1) * fs->e2fs_bsize) {
|
|
error = bread(vp, lbn, fs->e2fs_bsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
bp->b_blkno = fsbtodb(fs, nb);
|
|
*bpp = bp;
|
|
return (0);
|
|
}
|
|
if (nb != 0) {
|
|
/*
|
|
* Consider need to reallocate a fragment.
|
|
*/
|
|
osize = fragroundup(fs, blkoff(fs, ip->i_size));
|
|
nsize = fragroundup(fs, size);
|
|
if (nsize <= osize) {
|
|
error = bread(vp, lbn, osize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
bp->b_blkno = fsbtodb(fs, nb);
|
|
} else {
|
|
/* Godmar thinks: this shouldn't happen w/o fragments */
|
|
printf("nsize %d(%d) > osize %d(%d) nb %d\n",
|
|
(int)nsize, (int)size, (int)osize,
|
|
(int)ip->i_size, (int)nb);
|
|
panic(
|
|
"ext2_balloc: Something is terribly wrong");
|
|
/*
|
|
* please note there haven't been any changes from here on -
|
|
* FFS seems to work.
|
|
*/
|
|
}
|
|
} else {
|
|
if (ip->i_size < (lbn + 1) * fs->e2fs_bsize)
|
|
nsize = fragroundup(fs, size);
|
|
else
|
|
nsize = fs->e2fs_bsize;
|
|
EXT2_LOCK(ump);
|
|
error = ext2_alloc(ip, lbn,
|
|
ext2_blkpref(ip, lbn, (int)lbn, &ip->i_db[0], 0),
|
|
nsize, cred, &newb);
|
|
if (error)
|
|
return (error);
|
|
bp = getblk(vp, lbn, nsize, 0, 0, 0);
|
|
bp->b_blkno = fsbtodb(fs, newb);
|
|
if (flags & BA_CLRBUF)
|
|
vfs_bio_clrbuf(bp);
|
|
}
|
|
ip->i_db[lbn] = dbtofsb(fs, bp->b_blkno);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
*bpp = bp;
|
|
return (0);
|
|
}
|
|
/*
|
|
* Determine the number of levels of indirection.
|
|
*/
|
|
pref = 0;
|
|
if ((error = ext2_getlbns(vp, lbn, indirs, &num)) != 0)
|
|
return (error);
|
|
#ifdef INVARIANTS
|
|
if (num < 1)
|
|
panic ("ext2_balloc: ext2_getlbns returned indirect block");
|
|
#endif
|
|
/*
|
|
* Fetch the first indirect block allocating if necessary.
|
|
*/
|
|
--num;
|
|
nb = ip->i_ib[indirs[0].in_off];
|
|
if (nb == 0) {
|
|
EXT2_LOCK(ump);
|
|
pref = ext2_blkpref(ip, lbn, indirs[0].in_off +
|
|
EXT2_NDIR_BLOCKS, &ip->i_db[0], 0);
|
|
if ((error = ext2_alloc(ip, lbn, pref, fs->e2fs_bsize, cred,
|
|
&newb)))
|
|
return (error);
|
|
nb = newb;
|
|
bp = getblk(vp, indirs[1].in_lbn, fs->e2fs_bsize, 0, 0, 0);
|
|
bp->b_blkno = fsbtodb(fs, newb);
|
|
vfs_bio_clrbuf(bp);
|
|
/*
|
|
* Write synchronously so that indirect blocks
|
|
* never point at garbage.
|
|
*/
|
|
if ((error = bwrite(bp)) != 0) {
|
|
ext2_blkfree(ip, nb, fs->e2fs_bsize);
|
|
return (error);
|
|
}
|
|
ip->i_ib[indirs[0].in_off] = newb;
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
}
|
|
/*
|
|
* Fetch through the indirect blocks, allocating as necessary.
|
|
*/
|
|
for (i = 1;;) {
|
|
error = bread(vp,
|
|
indirs[i].in_lbn, (int)fs->e2fs_bsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
bap = (e2fs_daddr_t *)bp->b_data;
|
|
nb = bap[indirs[i].in_off];
|
|
if (i == num)
|
|
break;
|
|
i += 1;
|
|
if (nb != 0) {
|
|
bqrelse(bp);
|
|
continue;
|
|
}
|
|
EXT2_LOCK(ump);
|
|
if (pref == 0)
|
|
pref = ext2_blkpref(ip, lbn, indirs[i].in_off, bap,
|
|
bp->b_lblkno);
|
|
error = ext2_alloc(ip, lbn, pref, (int)fs->e2fs_bsize, cred, &newb);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
nb = newb;
|
|
nbp = getblk(vp, indirs[i].in_lbn, fs->e2fs_bsize, 0, 0, 0);
|
|
nbp->b_blkno = fsbtodb(fs, nb);
|
|
vfs_bio_clrbuf(nbp);
|
|
/*
|
|
* Write synchronously so that indirect blocks
|
|
* never point at garbage.
|
|
*/
|
|
if ((error = bwrite(nbp)) != 0) {
|
|
ext2_blkfree(ip, nb, fs->e2fs_bsize);
|
|
EXT2_UNLOCK(ump);
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
bap[indirs[i - 1].in_off] = nb;
|
|
/*
|
|
* If required, write synchronously, otherwise use
|
|
* delayed write.
|
|
*/
|
|
if (flags & IO_SYNC) {
|
|
bwrite(bp);
|
|
} else {
|
|
if (bp->b_bufsize == fs->e2fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
bdwrite(bp);
|
|
}
|
|
}
|
|
/*
|
|
* Get the data block, allocating if necessary.
|
|
*/
|
|
if (nb == 0) {
|
|
EXT2_LOCK(ump);
|
|
pref = ext2_blkpref(ip, lbn, indirs[i].in_off, &bap[0],
|
|
bp->b_lblkno);
|
|
if ((error = ext2_alloc(ip,
|
|
lbn, pref, (int)fs->e2fs_bsize, cred, &newb)) != 0) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
nb = newb;
|
|
nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0, 0);
|
|
nbp->b_blkno = fsbtodb(fs, nb);
|
|
if (flags & BA_CLRBUF)
|
|
vfs_bio_clrbuf(nbp);
|
|
bap[indirs[i].in_off] = nb;
|
|
/*
|
|
* If required, write synchronously, otherwise use
|
|
* delayed write.
|
|
*/
|
|
if (flags & IO_SYNC) {
|
|
bwrite(bp);
|
|
} else {
|
|
if (bp->b_bufsize == fs->e2fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
bdwrite(bp);
|
|
}
|
|
*bpp = nbp;
|
|
return (0);
|
|
}
|
|
brelse(bp);
|
|
if (flags & BA_CLRBUF) {
|
|
int seqcount = (flags & BA_SEQMASK) >> BA_SEQSHIFT;
|
|
if (seqcount && (vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
|
|
error = cluster_read(vp, ip->i_size, lbn,
|
|
(int)fs->e2fs_bsize, NOCRED,
|
|
MAXBSIZE, seqcount, 0, &nbp);
|
|
} else {
|
|
error = bread(vp, lbn, (int)fs->e2fs_bsize, NOCRED, &nbp);
|
|
}
|
|
if (error) {
|
|
brelse(nbp);
|
|
return (error);
|
|
}
|
|
} else {
|
|
nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0, 0);
|
|
nbp->b_blkno = fsbtodb(fs, nb);
|
|
}
|
|
*bpp = nbp;
|
|
return (0);
|
|
}
|
|
|