union dinode *
getino(ino_t inum)
{
static daddr_t inoblkno;
daddr_t blkno;
static struct ufs1_dinode inoblock[MAXBSIZE / sizeof (struct ufs1_dinode)];
static struct ufs1_dinode ifile_dinode; /* XXX fill this in */
static struct ufs1_dinode empty_dinode; /* Always stays zeroed */
struct ufs1_dinode *dp;
if(inum == sblock->lfs_ifile) {
/* Load the ifile inode if not already */
if(ifile_dinode.di_u.inumber == 0) {
blkno = sblock->lfs_idaddr;
bread(fsbtodb(sblock, blkno), (char *)inoblock,
(int)sblock->lfs_bsize);
dp = lfs_ifind(sblock, inum, inoblock);
ifile_dinode = *dp; /* Structure copy */
}
return (union dinode *)&ifile_dinode;
}
curino = inum;
blkno = lfs_ientry(inum)->if_daddr;
if(blkno == LFS_UNUSED_DADDR)
return (union dinode *)&empty_dinode;
if(blkno != inoblkno) {
bread(fsbtodb(sblock, blkno), (char *)inoblock,
(int)sblock->lfs_bsize);
#ifdef notyet
if (needswap)
for (i = 0; i < MAXINOPB; i++)
ffs_dinode_swap(&inoblock[i], &inoblock[i]);
#endif
}
return (union dinode *)lfs_ifind(sblock, inum, inoblock);
}
int
lfs_fastvget(struct mount *mp, ino_t ino, daddr_t daddr, struct vnode **vpp,
struct ulfs1_dinode *dinp)
{
struct inode *ip;
struct ulfs1_dinode *dip;
struct vnode *vp;
struct ulfsmount *ump;
dev_t dev;
int error, retries;
struct buf *bp;
struct lfs *fs;
ump = VFSTOULFS(mp);
dev = ump->um_dev;
fs = ump->um_lfs;
/*
* Wait until the filesystem is fully mounted before allowing vget
* to complete. This prevents possible problems with roll-forward.
*/
mutex_enter(&lfs_lock);
while (fs->lfs_flags & LFS_NOTYET) {
mtsleep(&fs->lfs_flags, PRIBIO+1, "lfs_fnotyet", 0,
&lfs_lock);
}
mutex_exit(&lfs_lock);
/*
* This is playing fast and loose. Someone may have the inode
* locked, in which case they are going to be distinctly unhappy
* if we trash something.
*/
error = lfs_fasthashget(dev, ino, vpp);
if (error != 0 || *vpp != NULL)
return (error);
/*
* getnewvnode(9) will call vfs_busy, which will block if the
* filesystem is being unmounted; but umount(9) is waiting for
* us because we're already holding the fs busy.
* XXXMP
*/
if (mp->mnt_iflag & IMNT_UNMOUNT) {
*vpp = NULL;
return EDEADLK;
}
error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, NULL, &vp);
if (error) {
*vpp = NULL;
return (error);
}
mutex_enter(&ulfs_hashlock);
error = lfs_fasthashget(dev, ino, vpp);
if (error != 0 || *vpp != NULL) {
mutex_exit(&ulfs_hashlock);
ungetnewvnode(vp);
return (error);
}
/* Allocate new vnode/inode. */
lfs_vcreate(mp, ino, vp);
/*
* Put it onto its hash chain and lock it so that other requests for
* this inode will block if they arrive while we are sleeping waiting
* for old data structures to be purged or for the contents of the
* disk portion of this inode to be read.
*/
ip = VTOI(vp);
ulfs_ihashins(ip);
mutex_exit(&ulfs_hashlock);
#ifdef notyet
/* Not found in the cache => this vnode was loaded only for cleaning. */
ip->i_lfs_iflags |= LFSI_BMAP;
#endif
/*
* XXX
* This may not need to be here, logically it should go down with
* the i_devvp initialization.
* Ask Kirk.
*/
ip->i_lfs = fs;
/* Read in the disk contents for the inode, copy into the inode. */
if (dinp) {
error = copyin(dinp, ip->i_din.ffs1_din, sizeof (struct ulfs1_dinode));
if (error) {
DLOG((DLOG_CLEAN, "lfs_fastvget: dinode copyin failed"
" for ino %d\n", ino));
ulfs_ihashrem(ip);
/* Unlock and discard unneeded inode. */
VOP_UNLOCK(vp);
lfs_vunref(vp);
*vpp = NULL;
return (error);
}
if (ip->i_number != ino)
panic("lfs_fastvget: I was fed the wrong inode!");
} else {
retries = 0;
again:
error = bread(ump->um_devvp, LFS_FSBTODB(fs, daddr), fs->lfs_ibsize,
NOCRED, 0, &bp);
if (error) {
DLOG((DLOG_CLEAN, "lfs_fastvget: bread failed (%d)\n",
error));
/*
* The inode does not contain anything useful, so it
* would be misleading to leave it on its hash chain.
* Iput() will return it to the free list.
*/
ulfs_ihashrem(ip);
/* Unlock and discard unneeded inode. */
VOP_UNLOCK(vp);
lfs_vunref(vp);
*vpp = NULL;
return (error);
}
dip = lfs_ifind(ump->um_lfs, ino, bp);
if (dip == NULL) {
/* Assume write has not completed yet; try again */
brelse(bp, BC_INVAL);
++retries;
if (retries > LFS_IFIND_RETRIES)
panic("lfs_fastvget: dinode not found");
DLOG((DLOG_CLEAN, "lfs_fastvget: dinode not found,"
" retrying...\n"));
goto again;
}
*ip->i_din.ffs1_din = *dip;
brelse(bp, 0);
}
lfs_vinit(mp, &vp);
*vpp = vp;
KASSERT(VOP_ISLOCKED(vp));
VOP_UNLOCK(vp);
return (0);
}
