515 lines
14 KiB
C
515 lines
14 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_inode.c 8.5 (Berkeley) 12/30/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
#include <fs/ext2fs/inode.h>
|
|
#include <fs/ext2fs/ext2_mount.h>
|
|
#include <fs/ext2fs/ext2fs.h>
|
|
#include <fs/ext2fs/fs.h>
|
|
#include <fs/ext2fs/ext2_extern.h>
|
|
|
|
static int ext2_indirtrunc(struct inode *, int32_t, int32_t, int32_t, int,
|
|
long *);
|
|
|
|
/*
|
|
* Update the access, modified, and inode change times as specified by the
|
|
* IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode
|
|
* to disk if the IN_MODIFIED flag is set (it may be set initially, or by
|
|
* the timestamp update). The IN_LAZYMOD flag is set to force a write
|
|
* later if not now. If we write now, then clear both IN_MODIFIED and
|
|
* IN_LAZYMOD to reflect the presumably successful write, and if waitfor is
|
|
* set, then wait for the write to complete.
|
|
*/
|
|
int
|
|
ext2_update(struct vnode *vp, int waitfor)
|
|
{
|
|
struct m_ext2fs *fs;
|
|
struct buf *bp;
|
|
struct inode *ip;
|
|
int error;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "ext2_update");
|
|
ext2_itimes(vp);
|
|
ip = VTOI(vp);
|
|
if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0)
|
|
return (0);
|
|
ip->i_flag &= ~(IN_LAZYACCESS | IN_LAZYMOD | IN_MODIFIED);
|
|
fs = ip->i_e2fs;
|
|
if(fs->e2fs_ronly)
|
|
return (0);
|
|
if ((error = bread(ip->i_devvp,
|
|
fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
|
|
(int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
ext2_i2ei(ip, (struct ext2fs_dinode *)((char *)bp->b_data +
|
|
EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)));
|
|
if (waitfor && !DOINGASYNC(vp))
|
|
return (bwrite(bp));
|
|
else {
|
|
bdwrite(bp);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
#define SINGLE 0 /* index of single indirect block */
|
|
#define DOUBLE 1 /* index of double indirect block */
|
|
#define TRIPLE 2 /* index of triple indirect block */
|
|
/*
|
|
* Truncate the inode oip to at most length size, freeing the
|
|
* disk blocks.
|
|
*/
|
|
int
|
|
ext2_truncate(struct vnode *vp, off_t length, int flags, struct ucred *cred,
|
|
struct thread *td)
|
|
{
|
|
struct vnode *ovp = vp;
|
|
int32_t lastblock;
|
|
struct inode *oip;
|
|
int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
|
|
uint32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
|
|
struct bufobj *bo;
|
|
struct m_ext2fs *fs;
|
|
struct buf *bp;
|
|
int offset, size, level;
|
|
long count, nblocks, blocksreleased = 0;
|
|
int error, i, allerror;
|
|
off_t osize;
|
|
|
|
oip = VTOI(ovp);
|
|
bo = &ovp->v_bufobj;
|
|
|
|
ASSERT_VOP_LOCKED(vp, "ext2_truncate");
|
|
|
|
if (length < 0)
|
|
return (EINVAL);
|
|
|
|
if (ovp->v_type == VLNK &&
|
|
oip->i_size < ovp->v_mount->mnt_maxsymlinklen) {
|
|
#ifdef DIAGNOSTIC
|
|
if (length != 0)
|
|
panic("ext2_truncate: partial truncate of symlink");
|
|
#endif
|
|
bzero((char *)&oip->i_shortlink, (u_int)oip->i_size);
|
|
oip->i_size = 0;
|
|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
return (ext2_update(ovp, 1));
|
|
}
|
|
if (oip->i_size == length) {
|
|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
return (ext2_update(ovp, 0));
|
|
}
|
|
fs = oip->i_e2fs;
|
|
osize = oip->i_size;
|
|
/*
|
|
* Lengthen the size of the file. We must ensure that the
|
|
* last byte of the file is allocated. Since the smallest
|
|
* value of osize is 0, length will be at least 1.
|
|
*/
|
|
if (osize < length) {
|
|
if (length > oip->i_e2fs->e2fs_maxfilesize)
|
|
return (EFBIG);
|
|
vnode_pager_setsize(ovp, length);
|
|
offset = blkoff(fs, length - 1);
|
|
lbn = lblkno(fs, length - 1);
|
|
flags |= BA_CLRBUF;
|
|
error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, flags);
|
|
if (error) {
|
|
vnode_pager_setsize(vp, osize);
|
|
return (error);
|
|
}
|
|
oip->i_size = length;
|
|
if (bp->b_bufsize == fs->e2fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
if (flags & IO_SYNC)
|
|
bwrite(bp);
|
|
else if (DOINGASYNC(ovp))
|
|
bdwrite(bp);
|
|
else
|
|
bawrite(bp);
|
|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
return (ext2_update(ovp, !DOINGASYNC(ovp)));
|
|
}
|
|
/*
|
|
* Shorten the size of the file. If the file is not being
|
|
* truncated to a block boundry, the contents of the
|
|
* partial block following the end of the file must be
|
|
* zero'ed in case it ever become accessible again because
|
|
* of subsequent file growth.
|
|
*/
|
|
/* I don't understand the comment above */
|
|
offset = blkoff(fs, length);
|
|
if (offset == 0) {
|
|
oip->i_size = length;
|
|
} else {
|
|
lbn = lblkno(fs, length);
|
|
flags |= BA_CLRBUF;
|
|
error = ext2_balloc(oip, lbn, offset, cred, &bp, flags);
|
|
if (error)
|
|
return (error);
|
|
oip->i_size = length;
|
|
size = blksize(fs, oip, lbn);
|
|
bzero((char *)bp->b_data + offset, (u_int)(size - offset));
|
|
allocbuf(bp, size);
|
|
if (bp->b_bufsize == fs->e2fs_bsize)
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
if (flags & IO_SYNC)
|
|
bwrite(bp);
|
|
else if (DOINGASYNC(ovp))
|
|
bdwrite(bp);
|
|
else
|
|
bawrite(bp);
|
|
}
|
|
/*
|
|
* Calculate index into inode's block list of
|
|
* last direct and indirect blocks (if any)
|
|
* which we want to keep. Lastblock is -1 when
|
|
* the file is truncated to 0.
|
|
*/
|
|
lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1;
|
|
lastiblock[SINGLE] = lastblock - NDADDR;
|
|
lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs);
|
|
lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs);
|
|
nblocks = btodb(fs->e2fs_bsize);
|
|
/*
|
|
* Update file and block pointers on disk before we start freeing
|
|
* blocks. If we crash before free'ing blocks below, the blocks
|
|
* will be returned to the free list. lastiblock values are also
|
|
* normalized to -1 for calls to ext2_indirtrunc below.
|
|
*/
|
|
bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof(oldblks));
|
|
for (level = TRIPLE; level >= SINGLE; level--)
|
|
if (lastiblock[level] < 0) {
|
|
oip->i_ib[level] = 0;
|
|
lastiblock[level] = -1;
|
|
}
|
|
for (i = NDADDR - 1; i > lastblock; i--)
|
|
oip->i_db[i] = 0;
|
|
oip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
allerror = ext2_update(ovp, !DOINGASYNC(ovp));
|
|
|
|
/*
|
|
* Having written the new inode to disk, save its new configuration
|
|
* and put back the old block pointers long enough to process them.
|
|
* Note that we save the new block configuration so we can check it
|
|
* when we are done.
|
|
*/
|
|
bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof(newblks));
|
|
bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof(oldblks));
|
|
oip->i_size = osize;
|
|
error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
|
|
if (error && (allerror == 0))
|
|
allerror = error;
|
|
vnode_pager_setsize(ovp, length);
|
|
|
|
/*
|
|
* Indirect blocks first.
|
|
*/
|
|
indir_lbn[SINGLE] = -NDADDR;
|
|
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1;
|
|
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1;
|
|
for (level = TRIPLE; level >= SINGLE; level--) {
|
|
bn = oip->i_ib[level];
|
|
if (bn != 0) {
|
|
error = ext2_indirtrunc(oip, indir_lbn[level],
|
|
fsbtodb(fs, bn), lastiblock[level], level, &count);
|
|
if (error)
|
|
allerror = error;
|
|
blocksreleased += count;
|
|
if (lastiblock[level] < 0) {
|
|
oip->i_ib[level] = 0;
|
|
ext2_blkfree(oip, bn, fs->e2fs_fsize);
|
|
blocksreleased += nblocks;
|
|
}
|
|
}
|
|
if (lastiblock[level] >= 0)
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* All whole direct blocks or frags.
|
|
*/
|
|
for (i = NDADDR - 1; i > lastblock; i--) {
|
|
long bsize;
|
|
|
|
bn = oip->i_db[i];
|
|
if (bn == 0)
|
|
continue;
|
|
oip->i_db[i] = 0;
|
|
bsize = blksize(fs, oip, i);
|
|
ext2_blkfree(oip, bn, bsize);
|
|
blocksreleased += btodb(bsize);
|
|
}
|
|
if (lastblock < 0)
|
|
goto done;
|
|
|
|
/*
|
|
* Finally, look for a change in size of the
|
|
* last direct block; release any frags.
|
|
*/
|
|
bn = oip->i_db[lastblock];
|
|
if (bn != 0) {
|
|
long oldspace, newspace;
|
|
|
|
/*
|
|
* Calculate amount of space we're giving
|
|
* back as old block size minus new block size.
|
|
*/
|
|
oldspace = blksize(fs, oip, lastblock);
|
|
oip->i_size = length;
|
|
newspace = blksize(fs, oip, lastblock);
|
|
if (newspace == 0)
|
|
panic("ext2_truncate: newspace");
|
|
if (oldspace - newspace > 0) {
|
|
/*
|
|
* Block number of space to be free'd is
|
|
* the old block # plus the number of frags
|
|
* required for the storage we're keeping.
|
|
*/
|
|
bn += numfrags(fs, newspace);
|
|
ext2_blkfree(oip, bn, oldspace - newspace);
|
|
blocksreleased += btodb(oldspace - newspace);
|
|
}
|
|
}
|
|
done:
|
|
#ifdef DIAGNOSTIC
|
|
for (level = SINGLE; level <= TRIPLE; level++)
|
|
if (newblks[NDADDR + level] != oip->i_ib[level])
|
|
panic("itrunc1");
|
|
for (i = 0; i < NDADDR; i++)
|
|
if (newblks[i] != oip->i_db[i])
|
|
panic("itrunc2");
|
|
BO_LOCK(bo);
|
|
if (length == 0 && (bo->bo_dirty.bv_cnt != 0 ||
|
|
bo->bo_clean.bv_cnt != 0))
|
|
panic("itrunc3");
|
|
BO_UNLOCK(bo);
|
|
#endif /* DIAGNOSTIC */
|
|
/*
|
|
* Put back the real size.
|
|
*/
|
|
oip->i_size = length;
|
|
if (oip->i_blocks >= blocksreleased)
|
|
oip->i_blocks -= blocksreleased;
|
|
else /* sanity */
|
|
oip->i_blocks = 0;
|
|
oip->i_flag |= IN_CHANGE;
|
|
vnode_pager_setsize(ovp, length);
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* Release blocks associated with the inode ip and stored in the indirect
|
|
* block bn. Blocks are free'd in LIFO order up to (but not including)
|
|
* lastbn. If level is greater than SINGLE, the block is an indirect block
|
|
* and recursive calls to indirtrunc must be used to cleanse other indirect
|
|
* blocks.
|
|
*
|
|
* NB: triple indirect blocks are untested.
|
|
*/
|
|
|
|
static int
|
|
ext2_indirtrunc(struct inode *ip, int32_t lbn, int32_t dbn, int32_t lastbn,
|
|
int level, long *countp)
|
|
{
|
|
struct buf *bp;
|
|
struct m_ext2fs *fs = ip->i_e2fs;
|
|
struct vnode *vp;
|
|
int32_t *bap, *copy, nb, nlbn, last;
|
|
long blkcount, factor;
|
|
int i, nblocks, blocksreleased = 0;
|
|
int error = 0, allerror = 0;
|
|
|
|
/*
|
|
* Calculate index in current block of last
|
|
* block to be kept. -1 indicates the entire
|
|
* block so we need not calculate the index.
|
|
*/
|
|
factor = 1;
|
|
for (i = SINGLE; i < level; i++)
|
|
factor *= NINDIR(fs);
|
|
last = lastbn;
|
|
if (lastbn > 0)
|
|
last /= factor;
|
|
nblocks = btodb(fs->e2fs_bsize);
|
|
/*
|
|
* Get buffer of block pointers, zero those entries corresponding
|
|
* to blocks to be free'd, and update on disk copy first. Since
|
|
* double(triple) indirect before single(double) indirect, calls
|
|
* to bmap on these blocks will fail. However, we already have
|
|
* the on disk address, so we have to set the b_blkno field
|
|
* explicitly instead of letting bread do everything for us.
|
|
*/
|
|
vp = ITOV(ip);
|
|
bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0, 0);
|
|
if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) {
|
|
bp->b_iocmd = BIO_READ;
|
|
if (bp->b_bcount > bp->b_bufsize)
|
|
panic("ext2_indirtrunc: bad buffer size");
|
|
bp->b_blkno = dbn;
|
|
vfs_busy_pages(bp, 0);
|
|
bp->b_iooffset = dbtob(bp->b_blkno);
|
|
bstrategy(bp);
|
|
error = bufwait(bp);
|
|
}
|
|
if (error) {
|
|
brelse(bp);
|
|
*countp = 0;
|
|
return (error);
|
|
}
|
|
|
|
bap = (int32_t *)bp->b_data;
|
|
copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK);
|
|
bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->e2fs_bsize);
|
|
bzero((caddr_t)&bap[last + 1],
|
|
(u_int)(NINDIR(fs) - (last + 1)) * sizeof(int32_t));
|
|
if (last == -1)
|
|
bp->b_flags |= B_INVAL;
|
|
if (DOINGASYNC(vp)) {
|
|
bdwrite(bp);
|
|
} else {
|
|
error = bwrite(bp);
|
|
if (error)
|
|
allerror = error;
|
|
}
|
|
bap = copy;
|
|
|
|
/*
|
|
* Recursively free totally unused blocks.
|
|
*/
|
|
for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last;
|
|
i--, nlbn += factor) {
|
|
nb = bap[i];
|
|
if (nb == 0)
|
|
continue;
|
|
if (level > SINGLE) {
|
|
if ((error = ext2_indirtrunc(ip, nlbn,
|
|
fsbtodb(fs, nb), (int32_t)-1, level - 1, &blkcount)) != 0)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
ext2_blkfree(ip, nb, fs->e2fs_bsize);
|
|
blocksreleased += nblocks;
|
|
}
|
|
|
|
/*
|
|
* Recursively free last partial block.
|
|
*/
|
|
if (level > SINGLE && lastbn >= 0) {
|
|
last = lastbn % factor;
|
|
nb = bap[i];
|
|
if (nb != 0) {
|
|
if ((error = ext2_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
|
|
last, level - 1, &blkcount)) != 0)
|
|
allerror = error;
|
|
blocksreleased += blkcount;
|
|
}
|
|
}
|
|
free(copy, M_TEMP);
|
|
*countp = blocksreleased;
|
|
return (allerror);
|
|
}
|
|
|
|
/*
|
|
* discard preallocated blocks
|
|
*/
|
|
int
|
|
ext2_inactive(struct vop_inactive_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip = VTOI(vp);
|
|
struct thread *td = ap->a_td;
|
|
int mode, error = 0;
|
|
|
|
/*
|
|
* Ignore inodes related to stale file handles.
|
|
*/
|
|
if (ip->i_mode == 0)
|
|
goto out;
|
|
if (ip->i_nlink <= 0) {
|
|
error = ext2_truncate(vp, (off_t)0, 0, NOCRED, td);
|
|
ip->i_rdev = 0;
|
|
mode = ip->i_mode;
|
|
ip->i_mode = 0;
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
ext2_vfree(vp, ip->i_number, mode);
|
|
}
|
|
if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE))
|
|
ext2_update(vp, 0);
|
|
out:
|
|
/*
|
|
* If we are done with the inode, reclaim it
|
|
* so that it can be reused immediately.
|
|
*/
|
|
if (ip->i_mode == 0)
|
|
vrecycle(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Reclaim an inode so that it can be used for other purposes.
|
|
*/
|
|
int
|
|
ext2_reclaim(struct vop_reclaim_args *ap)
|
|
{
|
|
struct inode *ip;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
ip = VTOI(vp);
|
|
if (ip->i_flag & IN_LAZYMOD) {
|
|
ip->i_flag |= IN_MODIFIED;
|
|
ext2_update(vp, 0);
|
|
}
|
|
vfs_hash_remove(vp);
|
|
free(vp->v_data, M_EXT2NODE);
|
|
vp->v_data = 0;
|
|
vnode_destroy_vobject(vp);
|
|
return (0);
|
|
}
|