/* $OpenBSD: ext2fs_inode.c,v 1.38 2007/06/17 20:15:25 jasper Exp $ */
/* $NetBSD: ext2fs_inode.c,v 1.24 2001/06/19 12:59:18 wiz Exp $ */
/*
* Copyright (c) 1997 Manuel Bouyer.
* 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. 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 8.8 (Berkeley) 10/19/94
* Modified for ext2fs by Manuel Bouyer.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/resourcevar.h>
#include <uvm/uvm_extern.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ext2fs/ext2fs.h>
#include <ufs/ext2fs/ext2fs_extern.h>
static int ext2fs_indirtrunc(struct inode *, int32_t, int32_t,
int32_t, int, long *);
/*
* Get the size of an inode.
*/
u_int64_t
ext2fs_size(struct inode *ip)
{
u_int64_t size = ip->i_e2fs_size;
if ((ip->i_e2fs_mode & IFMT) == IFREG)
size |= (u_int64_t)ip->i_e2fs_dacl << 32;
return (size);
}
int
ext2fs_setsize(struct inode *ip, u_int64_t size)
{
if ((ip->i_e2fs_mode & IFMT) == IFREG ||
ip->i_e2fs_mode == 0) {
ip->i_e2fs_dacl = size >> 32;
if (size >= 0x80000000U) {
struct m_ext2fs *fs = ip->i_e2fs;
if (fs->e2fs.e2fs_rev <= E2FS_REV0) {
/* Linux automagically upgrades to REV1 here! */
return (EFBIG);
}
if (!(fs->e2fs.e2fs_features_rocompat
& EXT2F_ROCOMPAT_LARGEFILE)) {
fs->e2fs.e2fs_features_rocompat |=
EXT2F_ROCOMPAT_LARGEFILE;
fs->e2fs_fmod = 1;
}
}
} else if (size >= 0x80000000U)
return (EFBIG);
ip->i_e2fs_size = size;
return (0);
}
/*
* Last reference to an inode. If necessary, write or delete it.
*/
int
ext2fs_inactive(void *v)
{
struct vop_inactive_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct proc *p = ap->a_p;
struct timespec ts;
int error = 0;
#ifdef DIAGNOSTIC
extern int prtactive;
if (prtactive && vp->v_usecount != 0)
vprint("ext2fs_inactive: pushing active", vp);
#endif
/* Get rid of inodes related to stale file handles. */
if (ip->i_e2din == NULL || ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime)
goto out;
error = 0;
if (ip->i_e2fs_nlink == 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
if (ext2fs_size(ip) != 0) {
error = ext2fs_truncate(ip, (off_t)0, 0, NOCRED);
}
getnanotime(&ts);
ip->i_e2fs_dtime = ts.tv_sec;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
ext2fs_inode_free(ip, ip->i_number, ip->i_e2fs_mode);
}
if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) {
ext2fs_update(ip, NULL, NULL, 0);
}
out:
VOP_UNLOCK(vp, 0, p);
/*
* If we are done with the inode, reclaim it
* so that it can be reused immediately.
*/
if (ip->i_e2din == NULL || ip->i_e2fs_dtime != 0)
vrecycle(vp, p);
return (error);
}
/*
* Update the access, modified, and inode change times as specified by the
* IACCESS, IUPDATE, and ICHANGE flags respectively. The IMODIFIED flag is
* used to specify that the inode needs to be updated but that the times have
* already been set. The access and modified times are taken from the second
* and third parameters; the inode change time is always taken from the current
* time. If waitfor is set, then wait for the disk write of the inode to
* complete.
*/
int
ext2fs_update(struct inode *ip, struct timespec *atime, struct timespec *mtime,
int waitfor)
{
struct m_ext2fs *fs;
struct buf *bp;
int error;
struct timespec ts;
caddr_t cp;
if (ITOV(ip)->v_mount->mnt_flag & MNT_RDONLY)
return (0);
getnanotime(&ts);
EXT2FS_ITIMES(ip,
atime ? atime : &ts,
mtime ? mtime : &ts);
if ((ip->i_flag & IN_MODIFIED) == 0)
return (0);
ip->i_flag &= ~IN_MODIFIED;
fs = ip->i_e2fs;
error = bread(ip->i_devvp,
fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
(int)fs->e2fs_bsize, NOCRED, &bp);
if (error) {
brelse(bp);
return (error);
}
ip->i_flag &= ~(IN_MODIFIED);
cp = (caddr_t)bp->b_data +
(ino_to_fsbo(fs, ip->i_number) * EXT2_DINODE_SIZE);
/*
* See note about 16-bit UID/GID limitation in ext2fs_vget(). Now
* that we are about to write the inode, construct the split UID and
* GID fields out of the two 32-bit fields we kept in memory.
*/
ip->i_e2fs_uid_low = (u_int16_t)ip->i_e2fs_uid;
ip->i_e2fs_gid_low = (u_int16_t)ip->i_e2fs_gid;
ip->i_e2fs_uid_high = ip->i_e2fs_uid >> 16;
ip->i_e2fs_gid_high = ip->i_e2fs_gid >> 16;
e2fs_isave(ip->i_e2din, (struct ext2fs_dinode *)cp);
if (waitfor)
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
ext2fs_truncate(struct inode *oip, off_t length, int flags, struct ucred *cred)
{
struct vnode *ovp = ITOV(oip);
int32_t lastblock;
int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR];
int32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR];
struct m_ext2fs *fs;
struct buf *bp;
int offset, size, level;
long count, nblocks, vflags, blocksreleased = 0;
int i;
int aflags, error, allerror;
off_t osize;
if (length < 0)
return (EINVAL);
if (ovp->v_type != VREG &&
ovp->v_type != VDIR &&
ovp->v_type != VLNK)
return (0);
if (ovp->v_type == VLNK &&
(ext2fs_size(oip) < ovp->v_mount->mnt_maxsymlinklen ||
(ovp->v_mount->mnt_maxsymlinklen == 0 &&
oip->i_e2fs_nblock == 0))) {
#ifdef DIAGNOSTIC
if (length != 0)
panic("ext2fs_truncate: partial truncate of symlink");
#endif
bzero((char *)&oip->i_e2din->e2di_shortlink,
(u_int)ext2fs_size(oip));
(void)ext2fs_setsize(oip, 0);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ext2fs_update(oip, NULL, NULL, 1));
}
if (ext2fs_size(oip) == length) {
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ext2fs_update(oip, NULL, NULL, 0));
}
fs = oip->i_e2fs;
osize = ext2fs_size(oip);
/*
* 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 0 /* XXX */
if (length > fs->fs_maxfilesize)
return (EFBIG);
#endif
offset = blkoff(fs, length - 1);
lbn = lblkno(fs, length - 1);
aflags = B_CLRBUF;
if (flags & IO_SYNC)
aflags |= B_SYNC;
error = ext2fs_buf_alloc(oip, lbn, offset + 1, cred, &bp,
aflags);
if (error)
return (error);
(void)ext2fs_setsize(oip, length);
uvm_vnp_setsize(ovp, length);
uvm_vnp_uncache(ovp);
if (aflags & B_SYNC)
bwrite(bp);
else
bawrite(bp);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ext2fs_update(oip, NULL, NULL, 1));
}
/*
* 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.
*/
offset = blkoff(fs, length);
if (offset == 0) {
(void)ext2fs_setsize(oip, length);
} else {
lbn = lblkno(fs, length);
aflags = B_CLRBUF;
if (flags & IO_SYNC)
aflags |= B_SYNC;
error = ext2fs_buf_alloc(oip, lbn, offset, cred, &bp,
aflags);
if (error)
return (error);
(void)ext2fs_setsize(oip, length);
size = fs->e2fs_bsize;
uvm_vnp_setsize(ovp, length);
uvm_vnp_uncache(ovp);
bzero(bp->b_data + offset, (u_int)(size - offset));
bp->b_bcount = size;
if (aflags & B_SYNC)
bwrite(bp);
else
bawrite(bp);
}
/*
* Calculate index into inode's block list of
* last direct and indirect blocks (if any)
* which we want to keep. Lastblock is -1 when
* the file is truncated to 0.
*/
lastblock = lblkno(fs, length + fs->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 ext2fs_indirtrunc below.
*/
memcpy((caddr_t)oldblks, (caddr_t)&oip->i_e2fs_blocks[0], sizeof oldblks);
for (level = TRIPLE; level >= SINGLE; level--)
if (lastiblock[level] < 0) {
oip->i_e2fs_blocks[NDADDR + level] = 0;
lastiblock[level] = -1;
}
for (i = NDADDR - 1; i > lastblock; i--)
oip->i_e2fs_blocks[i] = 0;
oip->i_flag |= IN_CHANGE | IN_UPDATE;
if ((error = ext2fs_update(oip, NULL, NULL, 1)) != 0)
allerror = error;
/*
* 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_e2fs_blocks[0], (caddr_t)newblks, sizeof newblks);
bcopy((caddr_t)oldblks, (caddr_t)&oip->i_e2fs_blocks[0], sizeof oldblks);
(void)ext2fs_setsize(oip, osize);
vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA;
allerror = vinvalbuf(ovp, vflags, cred, curproc, 0, 0);
/*
* 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 = fs2h32(oip->i_e2fs_blocks[NDADDR + level]);
if (bn != 0) {
error = ext2fs_indirtrunc(oip, indir_lbn[level],
fsbtodb(fs, bn), lastiblock[level], level, &count);
if (error)
allerror = error;
blocksreleased += count;
if (lastiblock[level] < 0) {
oip->i_e2fs_blocks[NDADDR + level] = 0;
ext2fs_blkfree(oip, bn);
blocksreleased += nblocks;
}
}
if (lastiblock[level] >= 0)
goto done;
}
/*
* All whole direct blocks or frags.
*/
for (i = NDADDR - 1; i > lastblock; i--) {
bn = fs2h32(oip->i_e2fs_blocks[i]);
if (bn == 0)
continue;
oip->i_e2fs_blocks[i] = 0;
ext2fs_blkfree(oip, bn);
blocksreleased += btodb(fs->e2fs_bsize);
}
done:
#ifdef DIAGNOSTIC
for (level = SINGLE; level <= TRIPLE; level++)
if (newblks[NDADDR + level] !=
oip->i_e2fs_blocks[NDADDR + level])
panic("ext2fs_truncate1");
for (i = 0; i < NDADDR; i++)
if (newblks[i] != oip->i_e2fs_blocks[i])
panic("ext2fs_truncate2");
if (length == 0 &&
(!LIST_EMPTY(&ovp->v_cleanblkhd) ||
!LIST_EMPTY(&ovp->v_dirtyblkhd)))
panic("ext2fs_truncate3");
#endif /* DIAGNOSTIC */
/*
* Put back the real size.
*/
(void)ext2fs_setsize(oip, length);
if (blocksreleased >= oip->i_e2fs_nblock)
oip->i_e2fs_nblock = 0;
else
oip->i_e2fs_nblock -= blocksreleased;
oip->i_flag |= IN_CHANGE;
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
ext2fs_indirtrunc(struct inode *ip, int32_t lbn, int32_t dbn, int32_t lastbn, int level, long *countp)
{
int i;
struct buf *bp;
struct m_ext2fs *fs = ip->i_e2fs;
int32_t *bap;
struct vnode *vp;
int32_t *copy = NULL, nb, nlbn, last;
long blkcount, factor;
int nblocks, blocksreleased = 0;
int error = 0, allerror = 0;
/*
* Calculate index in current block of last
* block to be kept. -1 indicates the entire
* block so we need not calculate the index.
*/
factor = 1;
for (i = SINGLE; i < level; i++)
factor *= NINDIR(fs);
last = lastbn;
if (lastbn > 0)
last /= factor;
nblocks = btodb(fs->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);
if (!(bp->b_flags & (B_DONE | B_DELWRI))) {
curproc->p_stats->p_ru.ru_inblock++; /* pay for read */
bp->b_flags |= B_READ;
if (bp->b_bcount > bp->b_bufsize)
panic("ext2fs_indirtrunc: bad buffer size");
bp->b_blkno = dbn;
VOP_STRATEGY(bp);
error = biowait(bp);
}
if (error) {
brelse(bp);
*countp = 0;
return (error);
}
bap = (int32_t *)bp->b_data;
if (lastbn >= 0) {
MALLOC(copy, int32_t *, fs->e2fs_bsize, M_TEMP, M_WAITOK);
memcpy((caddr_t)copy, (caddr_t)bap, (u_int)fs->e2fs_bsize);
memset((caddr_t)&bap[last + 1], 0,
(u_int)(NINDIR(fs) - (last + 1)) * sizeof (u_int32_t));
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 = fs2h32(bap[i]);
if (nb == 0)
continue;
if (level > SINGLE) {
error = ext2fs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
(int32_t)-1, level - 1,
&blkcount);
if (error)
allerror = error;
blocksreleased += blkcount;
}
ext2fs_blkfree(ip, nb);
blocksreleased += nblocks;
}
/*
* Recursively free last partial block.
*/
if (level > SINGLE && lastbn >= 0) {
last = lastbn % factor;
nb = fs2h32(bap[i]);
if (nb != 0) {
error = ext2fs_indirtrunc(ip, nlbn, fsbtodb(fs, nb),
last, level - 1, &blkcount);
if (error)
allerror = error;
blocksreleased += blkcount;
}
}
if (copy != NULL) {
FREE(copy, M_TEMP);
} else {
bp->b_flags |= B_INVAL;
brelse(bp);
}
*countp = blocksreleased;
return (allerror);
}
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