int
v7fs_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *a = v;
struct vnode *vp = a->a_vp;
struct uio *uio = a->a_uio;
struct v7fs_node *v7node = vp->v_data;
struct v7fs_inode *inode = &v7node->inode;
vsize_t sz, filesz = v7fs_inode_filesize(inode);
const int advice = IO_ADV_DECODE(a->a_ioflag);
int error = 0;
DPRINTF("type=%d inode=%d\n", vp->v_type, v7node->inode.inode_number);
while (uio->uio_resid > 0) {
if ((sz = MIN(filesz - uio->uio_offset, uio->uio_resid)) == 0)
break;
error = ubc_uiomove(&vp->v_uobj, uio, sz, advice, UBC_READ |
UBC_PARTIALOK | UBC_UNMAP_FLAG(v));
if (error) {
break;
}
DPRINTF("read %zubyte\n", sz);
}
v7node->update_atime = true;
return error;
}
int
v7fs_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *a = v;
struct vnode *vp = a->a_vp;
struct uio *uio = a->a_uio;
int advice = IO_ADV_DECODE(a->a_ioflag);
struct v7fs_node *v7node = vp->v_data;
struct v7fs_inode *inode = &v7node->inode;
struct v7fs_self *fs = v7node->v7fsmount->core;
vsize_t sz;
int error = 0;
if (uio->uio_resid == 0)
return 0;
sz = v7fs_inode_filesize(inode);
DPRINTF("(i)%ld (v)%zu ofs=%zu + res=%zu = %zu\n", sz, vp->v_size,
uio->uio_offset, uio->uio_resid, uio->uio_offset + uio->uio_resid);
/* Append mode file offset is managed by kernel. */
if (a->a_ioflag & IO_APPEND)
uio->uio_offset = sz;
/* If write region is over filesize, expand. */
size_t newsize= uio->uio_offset + uio->uio_resid;
ssize_t expand = newsize - sz;
if (expand > 0) {
if ((error = v7fs_datablock_expand(fs, inode, expand)))
return error;
uvm_vnp_setsize(vp, newsize);
}
while (uio->uio_resid > 0) {
sz = uio->uio_resid;
if ((error = ubc_uiomove(&vp->v_uobj, uio, sz, advice,
UBC_WRITE | UBC_UNMAP_FLAG(v))))
break;
DPRINTF("write %zubyte\n", sz);
}
v7node->update_mtime = true;
return error;
}
int
sysvbfs_write(void *arg)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *a = arg;
struct vnode *v = a->a_vp;
struct uio *uio = a->a_uio;
int advice = IO_ADV_DECODE(a->a_ioflag);
struct sysvbfs_node *bnode = v->v_data;
bool extended = false;
vsize_t sz;
int err = 0;
if (a->a_vp->v_type != VREG)
return EISDIR;
if (a->a_ioflag & IO_APPEND)
uio->uio_offset = bnode->size;
if (uio->uio_resid == 0)
return 0;
if (bnode->size < uio->uio_offset + uio->uio_resid) {
sysvbfs_file_setsize(v, uio->uio_offset + uio->uio_resid);
extended = true;
}
while (uio->uio_resid > 0) {
sz = uio->uio_resid;
err = ubc_uiomove(&v->v_uobj, uio, sz, advice,
UBC_WRITE | UBC_UNMAP_FLAG(v));
if (err)
break;
DPRINTF("%s: write %ldbyte\n", __func__, sz);
}
if (err)
sysvbfs_file_setsize(v, bnode->size - uio->uio_resid);
VN_KNOTE(v, NOTE_WRITE | (extended ? NOTE_EXTEND : 0));
return err;
}
int
sysvbfs_read(void *arg)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *a = arg;
struct vnode *v = a->a_vp;
struct uio *uio = a->a_uio;
struct sysvbfs_node *bnode = v->v_data;
struct bfs_inode *inode = bnode->inode;
vsize_t sz, filesz = bfs_file_size(inode);
int err;
const int advice = IO_ADV_DECODE(a->a_ioflag);
DPRINTF("%s: type=%d\n", __func__, v->v_type);
switch (v->v_type) {
case VREG:
break;
case VDIR:
return EISDIR;
default:
return EINVAL;
}
while (uio->uio_resid > 0) {
if ((sz = MIN(filesz - uio->uio_offset, uio->uio_resid)) == 0)
break;
err = ubc_uiomove(&v->v_uobj, uio, sz, advice,
UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(v));
if (err)
break;
DPRINTF("%s: read %ldbyte\n", __func__, sz);
}
return sysvbfs_update(v, NULL, NULL, UPDATE_WAIT);
}
/*
* are things locked??? they need to be to avoid this being
* deleted or changed (data block pointer blocks moving about.)
*/
int
adosfs_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *sp = v;
struct vnode *vp = sp->a_vp;
struct adosfsmount *amp;
struct anode *ap;
struct uio *uio;
struct buf *bp;
daddr_t lbn;
int size, diff, error;
long n, on;
#ifdef ADOSFS_DIAGNOSTIC
advopprint(sp);
#endif
error = 0;
uio = sp->a_uio;
ap = VTOA(sp->a_vp);
amp = ap->amp;
/*
* Return EOF for character devices, EIO for others
*/
if (sp->a_vp->v_type != VREG) {
error = EIO;
goto reterr;
}
if (uio->uio_resid == 0)
goto reterr;
if (uio->uio_offset < 0) {
error = EINVAL;
goto reterr;
}
/*
* to expensive to let general algorithm figure out that
* we are beyond the file. Do it now.
*/
if (uio->uio_offset >= ap->fsize)
goto reterr;
/*
* taken from ufs_read()
*/
if (vp->v_type == VREG && IS_FFS(amp)) {
const int advice = IO_ADV_DECODE(sp->a_ioflag);
error = 0;
while (uio->uio_resid > 0) {
vsize_t bytelen = MIN(ap->fsize - uio->uio_offset,
uio->uio_resid);
if (bytelen == 0) {
break;
}
error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
if (error) {
break;
}
}
goto out;
}
do {
size = amp->dbsize;
lbn = uio->uio_offset / size;
on = uio->uio_offset % size;
n = MIN(size - on, uio->uio_resid);
diff = ap->fsize - uio->uio_offset;
/*
* check for EOF
*/
if (diff <= 0)
return(0);
if (diff < n)
n = diff;
/*
* read ahead could possibly be worth something
* but not much as ados makes little attempt to
* make things contigous
*/
error = bread(sp->a_vp, lbn, amp->bsize, 0, &bp);
if (error) {
goto reterr;
}
if (!IS_FFS(amp)) {
if (bp->b_resid > 0)
error = EIO; /* OFS needs the complete block */
else if (adoswordn(bp, 0) != BPT_DATA) {
#ifdef DIAGNOSTIC
printf("adosfs: bad primary type blk %" PRId64 "\n",
bp->b_blkno / (amp->bsize / DEV_BSIZE));
#endif
error = EINVAL;
} else if (adoscksum(bp, ap->nwords)) {
#ifdef DIAGNOSTIC
printf("adosfs: blk %" PRId64 " failed cksum.\n",
bp->b_blkno / (amp->bsize / DEV_BSIZE));
#endif
error = EINVAL;
}
}
if (error) {
brelse(bp, 0);
goto reterr;
}
#ifdef ADOSFS_DIAGNOSTIC
printf(" %" PRId64 "+%ld-%" PRId64 "+%ld", lbn, on, lbn, n);
#endif
n = MIN(n, size - bp->b_resid);
error = uiomove((char *)bp->b_data + on +
amp->bsize - amp->dbsize, (int)n, uio);
brelse(bp, 0);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
out:
reterr:
#ifdef ADOSFS_DIAGNOSTIC
printf(" %d)", error);
#endif
return(error);
}
/*
* Vnode op for reading.
*/
int
filecore_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct filecore_node *ip = VTOI(vp);
struct filecore_mnt *fcmp;
struct buf *bp;
daddr_t lbn, rablock;
off_t diff;
int error = 0;
long size, n, on;
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_offset >= ip->i_size)
return (0);
ip->i_flag |= IN_ACCESS;
fcmp = ip->i_mnt;
if (vp->v_type == VREG) {
const int advice = IO_ADV_DECODE(ap->a_ioflag);
error = 0;
while (uio->uio_resid > 0) {
vsize_t bytelen = MIN(ip->i_size - uio->uio_offset,
uio->uio_resid);
if (bytelen == 0) {
break;
}
error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
if (error) {
break;
}
}
goto out;
}
do {
lbn = filecore_lblkno(fcmp, uio->uio_offset);
on = filecore_blkoff(fcmp, uio->uio_offset);
n = MIN(filecore_blksize(fcmp, ip, lbn) - on, uio->uio_resid);
diff = (off_t)ip->i_size - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
size = filecore_blksize(fcmp, ip, lbn);
rablock = lbn + 1;
if (ip->i_dirent.attr & FILECORE_ATTR_DIR) {
error = filecore_dbread(ip, &bp);
on = uio->uio_offset;
n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid);
size = FILECORE_DIR_SIZE;
} else {
error = bread(vp, lbn, size, NOCRED, 0, &bp);
#ifdef FILECORE_DEBUG_BR
printf("bread(%p, %llx, %ld, CRED, %p)=%d\n",
vp, (long long)lbn, size, bp, error);
#endif
}
if (error) {
return (error);
}
n = MIN(n, size - bp->b_resid);
error = uiomove((char *)(bp->b_data) + on, (int)n, uio);
#ifdef FILECORE_DEBUG_BR
printf("brelse(%p) vn2\n", bp);
#endif
brelse(bp, 0);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
out:
return (error);
}
/*
* Truncate the inode oip to at most length size, freeing the
* disk blocks.
*/
int
ffs_truncate(struct vnode *ovp, off_t length, int ioflag, kauth_cred_t cred)
{
daddr_t lastblock;
struct inode *oip = VTOI(ovp);
daddr_t bn, lastiblock[UFS_NIADDR], indir_lbn[UFS_NIADDR];
daddr_t blks[UFS_NDADDR + UFS_NIADDR];
struct fs *fs;
int offset, pgoffset, level;
int64_t count, blocksreleased = 0;
int i, aflag, nblocks;
int error, allerror = 0;
off_t osize;
int sync;
struct ufsmount *ump = oip->i_ump;
if (ovp->v_type == VCHR || ovp->v_type == VBLK ||
ovp->v_type == VFIFO || ovp->v_type == VSOCK) {
KASSERT(oip->i_size == 0);
return 0;
}
if (length < 0)
return (EINVAL);
if (ovp->v_type == VLNK &&
(oip->i_size < ump->um_maxsymlinklen ||
(ump->um_maxsymlinklen == 0 && DIP(oip, blocks) == 0))) {
KDASSERT(length == 0);
memset(SHORTLINK(oip), 0, (size_t)oip->i_size);
oip->i_size = 0;
DIP_ASSIGN(oip, size, 0);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ffs_update(ovp, NULL, NULL, 0));
}
if (oip->i_size == length) {
/* still do a uvm_vnp_setsize() as writesize may be larger */
uvm_vnp_setsize(ovp, length);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (ffs_update(ovp, NULL, NULL, 0));
}
fs = oip->i_fs;
if (length > ump->um_maxfilesize)
return (EFBIG);
if ((oip->i_flags & SF_SNAPSHOT) != 0)
ffs_snapremove(ovp);
osize = oip->i_size;
aflag = ioflag & IO_SYNC ? B_SYNC : 0;
/*
* 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 (ffs_lblkno(fs, osize) < UFS_NDADDR &&
ffs_lblkno(fs, osize) != ffs_lblkno(fs, length) &&
ffs_blkroundup(fs, osize) != osize) {
off_t eob;
eob = ffs_blkroundup(fs, osize);
uvm_vnp_setwritesize(ovp, eob);
error = ufs_balloc_range(ovp, osize, eob - osize,
cred, aflag);
if (error) {
(void) ffs_truncate(ovp, osize,
ioflag & IO_SYNC, cred);
return error;
}
if (ioflag & IO_SYNC) {
mutex_enter(ovp->v_interlock);
VOP_PUTPAGES(ovp,
trunc_page(osize & fs->fs_bmask),
round_page(eob), PGO_CLEANIT | PGO_SYNCIO |
PGO_JOURNALLOCKED);
}
}
uvm_vnp_setwritesize(ovp, length);
error = ufs_balloc_range(ovp, length - 1, 1, cred, aflag);
if (error) {
(void) ffs_truncate(ovp, osize, ioflag & IO_SYNC, cred);
return (error);
}
uvm_vnp_setsize(ovp, length);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
KASSERT(ovp->v_size == oip->i_size);
return (ffs_update(ovp, NULL, NULL, 0));
}
/*
* When truncating a regular file down to a non-block-aligned size,
* we must zero the part of last block which is past the new EOF.
* We must synchronously flush the zeroed pages to disk
* since the new pages will be invalidated as soon as we
* inform the VM system of the new, smaller size.
* We must do this before acquiring the GLOCK, since fetching
* the pages will acquire the GLOCK internally.
* So there is a window where another thread could see a whole
* zeroed page past EOF, but that's life.
*/
offset = ffs_blkoff(fs, length);
pgoffset = length & PAGE_MASK;
if (ovp->v_type == VREG && (pgoffset != 0 || offset != 0) &&
osize > length) {
daddr_t lbn;
voff_t eoz;
int size;
if (offset != 0) {
error = ufs_balloc_range(ovp, length - 1, 1, cred,
aflag);
if (error)
return error;
}
lbn = ffs_lblkno(fs, length);
size = ffs_blksize(fs, oip, lbn);
eoz = MIN(MAX(ffs_lblktosize(fs, lbn) + size, round_page(pgoffset)),
osize);
ubc_zerorange(&ovp->v_uobj, length, eoz - length,
UBC_UNMAP_FLAG(ovp));
if (round_page(eoz) > round_page(length)) {
mutex_enter(ovp->v_interlock);
error = VOP_PUTPAGES(ovp, round_page(length),
round_page(eoz),
PGO_CLEANIT | PGO_DEACTIVATE | PGO_JOURNALLOCKED |
((ioflag & IO_SYNC) ? PGO_SYNCIO : 0));
if (error)
return error;
}
}
genfs_node_wrlock(ovp);
oip->i_size = length;
DIP_ASSIGN(oip, size, length);
uvm_vnp_setsize(ovp, length);
/*
* 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 = ffs_lblkno(fs, length + fs->fs_bsize - 1) - 1;
lastiblock[SINGLE] = lastblock - UFS_NDADDR;
lastiblock[DOUBLE] = lastiblock[SINGLE] - FFS_NINDIR(fs);
lastiblock[TRIPLE] = lastiblock[DOUBLE] - FFS_NINDIR(fs) * FFS_NINDIR(fs);
nblocks = btodb(fs->fs_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 ffs_indirtrunc below.
*/
sync = 0;
for (level = TRIPLE; level >= SINGLE; level--) {
blks[UFS_NDADDR + level] = DIP(oip, ib[level]);
if (lastiblock[level] < 0 && blks[UFS_NDADDR + level] != 0) {
sync = 1;
DIP_ASSIGN(oip, ib[level], 0);
lastiblock[level] = -1;
}
}
for (i = 0; i < UFS_NDADDR; i++) {
blks[i] = DIP(oip, db[i]);
if (i > lastblock && blks[i] != 0) {
sync = 1;
DIP_ASSIGN(oip, db[i], 0);
}
}
oip->i_flag |= IN_CHANGE | IN_UPDATE;
if (sync) {
error = ffs_update(ovp, NULL, NULL, UPDATE_WAIT);
if (error && !allerror)
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.
*/
for (i = 0; i < UFS_NDADDR; i++) {
bn = DIP(oip, db[i]);
DIP_ASSIGN(oip, db[i], blks[i]);
blks[i] = bn;
}
for (i = 0; i < UFS_NIADDR; i++) {
bn = DIP(oip, ib[i]);
DIP_ASSIGN(oip, ib[i], blks[UFS_NDADDR + i]);
blks[UFS_NDADDR + i] = bn;
}
oip->i_size = osize;
DIP_ASSIGN(oip, size, osize);
error = vtruncbuf(ovp, lastblock + 1, 0, 0);
if (error && !allerror)
allerror = error;
/*
* Indirect blocks first.
*/
indir_lbn[SINGLE] = -UFS_NDADDR;
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - FFS_NINDIR(fs) - 1;
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - FFS_NINDIR(fs) * FFS_NINDIR(fs) - 1;
for (level = TRIPLE; level >= SINGLE; level--) {
if (oip->i_ump->um_fstype == UFS1)
bn = ufs_rw32(oip->i_ffs1_ib[level],UFS_FSNEEDSWAP(fs));
else
bn = ufs_rw64(oip->i_ffs2_ib[level],UFS_FSNEEDSWAP(fs));
if (bn != 0) {
error = ffs_indirtrunc(oip, indir_lbn[level],
FFS_FSBTODB(fs, bn), lastiblock[level], level, &count);
if (error)
allerror = error;
blocksreleased += count;
if (lastiblock[level] < 0) {
DIP_ASSIGN(oip, ib[level], 0);
if (oip->i_ump->um_mountp->mnt_wapbl) {
UFS_WAPBL_REGISTER_DEALLOCATION(
oip->i_ump->um_mountp,
FFS_FSBTODB(fs, bn), fs->fs_bsize);
} else
ffs_blkfree(fs, oip->i_devvp, bn,
fs->fs_bsize, oip->i_number);
blocksreleased += nblocks;
}
}
if (lastiblock[level] >= 0)
goto done;
}
/*
* All whole direct blocks or frags.
*/
for (i = UFS_NDADDR - 1; i > lastblock; i--) {
long bsize;
if (oip->i_ump->um_fstype == UFS1)
bn = ufs_rw32(oip->i_ffs1_db[i], UFS_FSNEEDSWAP(fs));
else
bn = ufs_rw64(oip->i_ffs2_db[i], UFS_FSNEEDSWAP(fs));
if (bn == 0)
continue;
DIP_ASSIGN(oip, db[i], 0);
bsize = ffs_blksize(fs, oip, i);
if ((oip->i_ump->um_mountp->mnt_wapbl) &&
(ovp->v_type != VREG)) {
UFS_WAPBL_REGISTER_DEALLOCATION(oip->i_ump->um_mountp,
FFS_FSBTODB(fs, bn), bsize);
} else
ffs_blkfree(fs, oip->i_devvp, bn, bsize, oip->i_number);
blocksreleased += btodb(bsize);
}
if (lastblock < 0)
goto done;
/*
* Finally, look for a change in size of the
* last direct block; release any frags.
*/
if (oip->i_ump->um_fstype == UFS1)
bn = ufs_rw32(oip->i_ffs1_db[lastblock], UFS_FSNEEDSWAP(fs));
else
bn = ufs_rw64(oip->i_ffs2_db[lastblock], UFS_FSNEEDSWAP(fs));
if (bn != 0) {
long oldspace, newspace;
/*
* Calculate amount of space we're giving
* back as old block size minus new block size.
*/
oldspace = ffs_blksize(fs, oip, lastblock);
oip->i_size = length;
DIP_ASSIGN(oip, size, length);
newspace = ffs_blksize(fs, oip, lastblock);
if (newspace == 0)
panic("itrunc: 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 += ffs_numfrags(fs, newspace);
if ((oip->i_ump->um_mountp->mnt_wapbl) &&
(ovp->v_type != VREG)) {
UFS_WAPBL_REGISTER_DEALLOCATION(
oip->i_ump->um_mountp, FFS_FSBTODB(fs, bn),
oldspace - newspace);
} else
ffs_blkfree(fs, oip->i_devvp, bn,
oldspace - newspace, oip->i_number);
blocksreleased += btodb(oldspace - newspace);
}
}
done:
#ifdef DIAGNOSTIC
for (level = SINGLE; level <= TRIPLE; level++)
if (blks[UFS_NDADDR + level] != DIP(oip, ib[level]))
panic("itrunc1");
for (i = 0; i < UFS_NDADDR; i++)
if (blks[i] != DIP(oip, db[i]))
panic("itrunc2");
if (length == 0 &&
(!LIST_EMPTY(&ovp->v_cleanblkhd) || !LIST_EMPTY(&ovp->v_dirtyblkhd)))
panic("itrunc3");
#endif /* DIAGNOSTIC */
/*
* Put back the real size.
*/
oip->i_size = length;
DIP_ASSIGN(oip, size, length);
DIP_ADD(oip, blocks, -blocksreleased);
genfs_node_unlock(ovp);
oip->i_flag |= IN_CHANGE;
UFS_WAPBL_UPDATE(ovp, NULL, NULL, 0);
#if defined(QUOTA) || defined(QUOTA2)
(void) chkdq(oip, -blocksreleased, NOCRED, 0);
#endif
KASSERT(ovp->v_type != VREG || ovp->v_size == oip->i_size);
return (allerror);
}
/*
* Vnode op for reading.
*/
int
cd9660_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct iso_node *ip = VTOI(vp);
struct iso_mnt *imp;
struct buf *bp;
daddr_t lbn, rablock;
off_t diff;
int rasize, error = 0;
long size, n, on;
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_offset >= ip->i_size)
return 0;
ip->i_flag |= IN_ACCESS;
imp = ip->i_mnt;
if (vp->v_type == VREG) {
const int advice = IO_ADV_DECODE(ap->a_ioflag);
error = 0;
while (uio->uio_resid > 0) {
vsize_t bytelen = MIN(ip->i_size - uio->uio_offset,
uio->uio_resid);
if (bytelen == 0)
break;
error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
if (error)
break;
}
goto out;
}
do {
lbn = cd9660_lblkno(imp, uio->uio_offset);
on = cd9660_blkoff(imp, uio->uio_offset);
n = MIN(imp->logical_block_size - on, uio->uio_resid);
diff = (off_t)ip->i_size - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
size = cd9660_blksize(imp, ip, lbn);
rablock = lbn + 1;
if (cd9660_lblktosize(imp, rablock) < ip->i_size) {
rasize = cd9660_blksize(imp, ip, rablock);
error = breadn(vp, lbn, size, &rablock,
&rasize, 1, NOCRED, 0, &bp);
} else {
error = bread(vp, lbn, size, NOCRED, 0, &bp);
}
if (error) {
return (error);
}
n = MIN(n, size - bp->b_resid);
error = uiomove((char *)bp->b_data + on, (int)n, uio);
brelse(bp, 0);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
out:
return (error);
}
int
lfs_truncate(struct vnode *ovp, off_t length, int ioflag, kauth_cred_t cred)
{
daddr_t lastblock;
struct inode *oip = VTOI(ovp);
daddr_t bn, lbn, lastiblock[ULFS_NIADDR], indir_lbn[ULFS_NIADDR];
/* XXX ondisk32 */
int32_t newblks[ULFS_NDADDR + ULFS_NIADDR];
struct lfs *fs;
struct buf *bp;
int offset, size, level;
daddr_t count, rcount;
daddr_t blocksreleased = 0, real_released = 0;
int i, nblocks;
int aflags, error, allerror = 0;
off_t osize;
long lastseg;
size_t bc;
int obufsize, odb;
int usepc;
if (ovp->v_type == VCHR || ovp->v_type == VBLK ||
ovp->v_type == VFIFO || ovp->v_type == VSOCK) {
KASSERT(oip->i_size == 0);
return 0;
}
if (length < 0)
return (EINVAL);
/*
* Just return and not update modification times.
*/
if (oip->i_size == length) {
/* still do a uvm_vnp_setsize() as writesize may be larger */
uvm_vnp_setsize(ovp, length);
return (0);
}
fs = oip->i_lfs;
if (ovp->v_type == VLNK &&
(oip->i_size < fs->um_maxsymlinklen ||
(fs->um_maxsymlinklen == 0 &&
oip->i_ffs1_blocks == 0))) {
#ifdef DIAGNOSTIC
if (length != 0)
panic("lfs_truncate: partial truncate of symlink");
#endif
memset((char *)SHORTLINK(oip), 0, (u_int)oip->i_size);
oip->i_size = oip->i_ffs1_size = 0;
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (lfs_update(ovp, NULL, NULL, 0));
}
if (oip->i_size == length) {
oip->i_flag |= IN_CHANGE | IN_UPDATE;
return (lfs_update(ovp, NULL, NULL, 0));
}
lfs_imtime(fs);
osize = oip->i_size;
usepc = (ovp->v_type == VREG && ovp != fs->lfs_ivnode);
ASSERT_NO_SEGLOCK(fs);
/*
* 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 > fs->um_maxfilesize)
return (EFBIG);
aflags = B_CLRBUF;
if (ioflag & IO_SYNC)
aflags |= B_SYNC;
if (usepc) {
if (lfs_lblkno(fs, osize) < ULFS_NDADDR &&
lfs_lblkno(fs, osize) != lfs_lblkno(fs, length) &&
lfs_blkroundup(fs, osize) != osize) {
off_t eob;
eob = lfs_blkroundup(fs, osize);
uvm_vnp_setwritesize(ovp, eob);
error = ulfs_balloc_range(ovp, osize,
eob - osize, cred, aflags);
if (error) {
(void) lfs_truncate(ovp, osize,
ioflag & IO_SYNC, cred);
return error;
}
if (ioflag & IO_SYNC) {
mutex_enter(ovp->v_interlock);
VOP_PUTPAGES(ovp,
trunc_page(osize & lfs_sb_getbmask(fs)),
round_page(eob),
PGO_CLEANIT | PGO_SYNCIO);
}
}
uvm_vnp_setwritesize(ovp, length);
error = ulfs_balloc_range(ovp, length - 1, 1, cred,
aflags);
if (error) {
(void) lfs_truncate(ovp, osize,
ioflag & IO_SYNC, cred);
return error;
}
uvm_vnp_setsize(ovp, length);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
KASSERT(ovp->v_size == oip->i_size);
oip->i_lfs_hiblk = lfs_lblkno(fs, oip->i_size + lfs_sb_getbsize(fs) - 1) - 1;
return (lfs_update(ovp, NULL, NULL, 0));
} else {
error = lfs_reserve(fs, ovp, NULL,
lfs_btofsb(fs, (ULFS_NIADDR + 2) << lfs_sb_getbshift(fs)));
if (error)
return (error);
error = lfs_balloc(ovp, length - 1, 1, cred,
aflags, &bp);
lfs_reserve(fs, ovp, NULL,
-lfs_btofsb(fs, (ULFS_NIADDR + 2) << lfs_sb_getbshift(fs)));
if (error)
return (error);
oip->i_ffs1_size = oip->i_size = length;
uvm_vnp_setsize(ovp, length);
(void) VOP_BWRITE(bp->b_vp, bp);
oip->i_flag |= IN_CHANGE | IN_UPDATE;
oip->i_lfs_hiblk = lfs_lblkno(fs, oip->i_size + lfs_sb_getbsize(fs) - 1) - 1;
return (lfs_update(ovp, NULL, NULL, 0));
}
}
if ((error = lfs_reserve(fs, ovp, NULL,
lfs_btofsb(fs, (2 * ULFS_NIADDR + 3) << lfs_sb_getbshift(fs)))) != 0)
return (error);
/*
* Shorten the size of the file. If the file is not being
* truncated to a block boundary, the contents of the
* partial block following the end of the file must be
* zero'ed in case it ever becomes accessible again because
* of subsequent file growth. Directories however are not
* zero'ed as they should grow back initialized to empty.
*/
offset = lfs_blkoff(fs, length);
lastseg = -1;
bc = 0;
if (ovp != fs->lfs_ivnode)
lfs_seglock(fs, SEGM_PROT);
if (offset == 0) {
oip->i_size = oip->i_ffs1_size = length;
} else if (!usepc) {
lbn = lfs_lblkno(fs, length);
aflags = B_CLRBUF;
if (ioflag & IO_SYNC)
aflags |= B_SYNC;
error = lfs_balloc(ovp, length - 1, 1, cred, aflags, &bp);
if (error) {
lfs_reserve(fs, ovp, NULL,
-lfs_btofsb(fs, (2 * ULFS_NIADDR + 3) << lfs_sb_getbshift(fs)));
goto errout;
}
obufsize = bp->b_bufsize;
odb = lfs_btofsb(fs, bp->b_bcount);
oip->i_size = oip->i_ffs1_size = length;
size = lfs_blksize(fs, oip, lbn);
if (ovp->v_type != VDIR)
memset((char *)bp->b_data + offset, 0,
(u_int)(size - offset));
allocbuf(bp, size, 1);
if ((bp->b_flags & B_LOCKED) != 0 && bp->b_iodone == NULL) {
mutex_enter(&lfs_lock);
locked_queue_bytes -= obufsize - bp->b_bufsize;
mutex_exit(&lfs_lock);
}
if (bp->b_oflags & BO_DELWRI) {
lfs_sb_addavail(fs, odb - lfs_btofsb(fs, size));
/* XXX shouldn't this wake up on lfs_availsleep? */
}
(void) VOP_BWRITE(bp->b_vp, bp);
} else { /* vp->v_type == VREG && length < osize && offset != 0 */
/*
* When truncating a regular file down to a non-block-aligned
* size, we must zero the part of last block which is past
* the new EOF. We must synchronously flush the zeroed pages
* to disk since the new pages will be invalidated as soon
* as we inform the VM system of the new, smaller size.
* We must do this before acquiring the GLOCK, since fetching
* the pages will acquire the GLOCK internally.
* So there is a window where another thread could see a whole
* zeroed page past EOF, but that's life.
*/
daddr_t xlbn;
voff_t eoz;
aflags = ioflag & IO_SYNC ? B_SYNC : 0;
error = ulfs_balloc_range(ovp, length - 1, 1, cred, aflags);
if (error) {
lfs_reserve(fs, ovp, NULL,
-lfs_btofsb(fs, (2 * ULFS_NIADDR + 3) << lfs_sb_getbshift(fs)));
goto errout;
}
xlbn = lfs_lblkno(fs, length);
size = lfs_blksize(fs, oip, xlbn);
eoz = MIN(lfs_lblktosize(fs, xlbn) + size, osize);
ubc_zerorange(&ovp->v_uobj, length, eoz - length,
UBC_UNMAP_FLAG(ovp));
if (round_page(eoz) > round_page(length)) {
mutex_enter(ovp->v_interlock);
error = VOP_PUTPAGES(ovp, round_page(length),
round_page(eoz),
PGO_CLEANIT | PGO_DEACTIVATE |
((ioflag & IO_SYNC) ? PGO_SYNCIO : 0));
if (error) {
lfs_reserve(fs, ovp, NULL,
-lfs_btofsb(fs, (2 * ULFS_NIADDR + 3) << lfs_sb_getbshift(fs)));
goto errout;
}
}
}
genfs_node_wrlock(ovp);
oip->i_size = oip->i_ffs1_size = length;
uvm_vnp_setsize(ovp, length);
/*
* 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.
*/
/* Avoid sign overflow - XXX assumes that off_t is a quad_t. */
if (length > QUAD_MAX - lfs_sb_getbsize(fs))
lastblock = lfs_lblkno(fs, QUAD_MAX - lfs_sb_getbsize(fs));
else
lastblock = lfs_lblkno(fs, length + lfs_sb_getbsize(fs) - 1) - 1;
lastiblock[SINGLE] = lastblock - ULFS_NDADDR;
lastiblock[DOUBLE] = lastiblock[SINGLE] - LFS_NINDIR(fs);
lastiblock[TRIPLE] = lastiblock[DOUBLE] - LFS_NINDIR(fs) * LFS_NINDIR(fs);
nblocks = lfs_btofsb(fs, lfs_sb_getbsize(fs));
/*
* Record changed file and block pointers before we start
* freeing blocks. lastiblock values are also normalized to -1
* for calls to lfs_indirtrunc below.
*/
memcpy((void *)newblks, (void *)&oip->i_ffs1_db[0], sizeof newblks);
for (level = TRIPLE; level >= SINGLE; level--)
if (lastiblock[level] < 0) {
newblks[ULFS_NDADDR+level] = 0;
lastiblock[level] = -1;
}
for (i = ULFS_NDADDR - 1; i > lastblock; i--)
newblks[i] = 0;
oip->i_size = oip->i_ffs1_size = osize;
error = lfs_vtruncbuf(ovp, lastblock + 1, false, 0);
if (error && !allerror)
allerror = error;
/*
* Indirect blocks first.
*/
indir_lbn[SINGLE] = -ULFS_NDADDR;
indir_lbn[DOUBLE] = indir_lbn[SINGLE] - LFS_NINDIR(fs) - 1;
indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - LFS_NINDIR(fs) * LFS_NINDIR(fs) - 1;
for (level = TRIPLE; level >= SINGLE; level--) {
bn = oip->i_ffs1_ib[level];
if (bn != 0) {
error = lfs_indirtrunc(oip, indir_lbn[level],
bn, lastiblock[level],
level, &count, &rcount,
&lastseg, &bc);
if (error)
allerror = error;
real_released += rcount;
blocksreleased += count;
if (lastiblock[level] < 0) {
if (oip->i_ffs1_ib[level] > 0)
real_released += nblocks;
blocksreleased += nblocks;
oip->i_ffs1_ib[level] = 0;
lfs_blkfree(fs, oip, bn, lfs_sb_getbsize(fs),
&lastseg, &bc);
lfs_deregister_block(ovp, bn);
}
}
if (lastiblock[level] >= 0)
goto done;
}
/*
* All whole direct blocks or frags.
*/
for (i = ULFS_NDADDR - 1; i > lastblock; i--) {
long bsize, obsize;
bn = oip->i_ffs1_db[i];
if (bn == 0)
continue;
bsize = lfs_blksize(fs, oip, i);
if (oip->i_ffs1_db[i] > 0) {
/* Check for fragment size changes */
obsize = oip->i_lfs_fragsize[i];
real_released += lfs_btofsb(fs, obsize);
oip->i_lfs_fragsize[i] = 0;
} else
obsize = 0;
blocksreleased += lfs_btofsb(fs, bsize);
oip->i_ffs1_db[i] = 0;
lfs_blkfree(fs, oip, bn, obsize, &lastseg, &bc);
lfs_deregister_block(ovp, bn);
}
if (lastblock < 0)
goto done;
/*
* Finally, look for a change in size of the
* last direct block; release any frags.
*/
bn = oip->i_ffs1_db[lastblock];
if (bn != 0) {
long oldspace, newspace;
#if 0
long olddspace;
#endif
/*
* Calculate amount of space we're giving
* back as old block size minus new block size.
*/
oldspace = lfs_blksize(fs, oip, lastblock);
#if 0
olddspace = oip->i_lfs_fragsize[lastblock];
#endif
oip->i_size = oip->i_ffs1_size = length;
newspace = lfs_blksize(fs, oip, lastblock);
if (newspace == 0)
panic("itrunc: newspace");
if (oldspace - newspace > 0) {
blocksreleased += lfs_btofsb(fs, oldspace - newspace);
}
#if 0
if (bn > 0 && olddspace - newspace > 0) {
/* No segment accounting here, just vnode */
real_released += lfs_btofsb(fs, olddspace - newspace);
}
#endif
}
done:
/* Finish segment accounting corrections */
lfs_update_seguse(fs, oip, lastseg, bc);
#ifdef DIAGNOSTIC
for (level = SINGLE; level <= TRIPLE; level++)
if ((newblks[ULFS_NDADDR + level] == 0) !=
((oip->i_ffs1_ib[level]) == 0)) {
panic("lfs itrunc1");
}
for (i = 0; i < ULFS_NDADDR; i++)
if ((newblks[i] == 0) != (oip->i_ffs1_db[i] == 0)) {
panic("lfs itrunc2");
}
if (length == 0 &&
(!LIST_EMPTY(&ovp->v_cleanblkhd) || !LIST_EMPTY(&ovp->v_dirtyblkhd)))
panic("lfs itrunc3");
#endif /* DIAGNOSTIC */
/*
* Put back the real size.
*/
oip->i_size = oip->i_ffs1_size = length;
oip->i_lfs_effnblks -= blocksreleased;
oip->i_ffs1_blocks -= real_released;
mutex_enter(&lfs_lock);
lfs_sb_addbfree(fs, blocksreleased);
mutex_exit(&lfs_lock);
#ifdef DIAGNOSTIC
if (oip->i_size == 0 &&
(oip->i_ffs1_blocks != 0 || oip->i_lfs_effnblks != 0)) {
printf("lfs_truncate: truncate to 0 but %d blks/%jd effblks\n",
oip->i_ffs1_blocks, (intmax_t)oip->i_lfs_effnblks);
panic("lfs_truncate: persistent blocks");
}
#endif
/*
* If we truncated to zero, take us off the paging queue.
*/
mutex_enter(&lfs_lock);
if (oip->i_size == 0 && oip->i_flags & IN_PAGING) {
oip->i_flags &= ~IN_PAGING;
TAILQ_REMOVE(&fs->lfs_pchainhd, oip, i_lfs_pchain);
}
mutex_exit(&lfs_lock);
oip->i_flag |= IN_CHANGE;
#if defined(LFS_QUOTA) || defined(LFS_QUOTA2)
(void) lfs_chkdq(oip, -blocksreleased, NOCRED, 0);
#endif
lfs_reserve(fs, ovp, NULL,
-lfs_btofsb(fs, (2 * ULFS_NIADDR + 3) << lfs_sb_getbshift(fs)));
genfs_node_unlock(ovp);
errout:
oip->i_lfs_hiblk = lfs_lblkno(fs, oip->i_size + lfs_sb_getbsize(fs) - 1) - 1;
if (ovp != fs->lfs_ivnode)
lfs_segunlock(fs);
return (allerror ? allerror : error);
}
