+/*
+ * Look up a FFS dinode number to find its incore vnode.
+ * If it is not in core, read it in from the specified device.
+ * If it is in core, wait for the lock bit to clear, then
+ * return the inode locked. Detection and handling of mount
+ * points must be done by the calling routine.
+ */
+int
+ffs_vget(mp, ino, vpp)
+ struct mount *mp;
+ ino_t ino;
+ struct vnode **vpp;
+{
+ register struct fs *fs;
+ register struct inode *ip;
+ struct ufsmount *ump;
+ struct buf *bp;
+ struct dinode *dp;
+ struct vnode *vp;
+ union ihead *ih;
+ dev_t dev;
+ int i, type, error;
+
+ ump = VFSTOUFS(mp);
+ dev = ump->um_dev;
+ if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
+ return (0);
+
+ /* Allocate a new vnode/inode. */
+ if (error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp)) {
+ *vpp = NULL;
+ return (error);
+ }
+ type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */
+ MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK);
+ bzero((caddr_t)ip, sizeof(struct inode));
+ vp->v_data = ip;
+ ip->i_vnode = vp;
+ ip->i_fs = fs = ump->um_fs;
+ ip->i_dev = dev;
+ ip->i_number = ino;
+#ifdef QUOTA
+ for (i = 0; i < MAXQUOTAS; i++)
+ ip->i_dquot[i] = NODQUOT;
+#endif
+ /*
+ * 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.
+ */
+ ufs_ihashins(ip);
+
+ /* Read in the disk contents for the inode, copy into the inode. */
+ if (error = bread(ump->um_devvp, fsbtodb(fs, itod(fs, ino)),
+ (int)fs->fs_bsize, NOCRED, &bp)) {
+ /*
+ * The inode does not contain anything useful, so it would
+ * be misleading to leave it on its hash chain. With mode
+ * still zero, it will be unlinked and returned to the free
+ * list by vput().
+ */
+ vput(vp);
+ brelse(bp);
+ *vpp = NULL;
+ return (error);
+ }
+ dp = bp->b_un.b_dino;
+ dp += itoo(fs, ino);
+ ip->i_din = *dp;
+ brelse(bp);
+
+ /*
+ * Initialize the vnode from the inode, check for aliases.
+ * Note that the underlying vnode may have changed.
+ */
+ if (error = ufs_vinit(mp, ffs_specop_p, FFS_FIFOOPS, &vp)) {
+ vput(vp);
+ *vpp = NULL;
+ return (error);
+ }
+ /*
+ * Finish inode initialization now that aliasing has been resolved.
+ */
+ ip->i_devvp = ump->um_devvp;
+ VREF(ip->i_devvp);
+ /*
+ * Set up a generation number for this inode if it does not
+ * already have one. This should only happen on old filesystems.
+ */
+ if (ip->i_gen == 0) {
+ if (++nextgennumber < (u_long)time.tv_sec)
+ nextgennumber = time.tv_sec;
+ ip->i_gen = nextgennumber;
+ if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
+ ip->i_flag |= IMOD;
+ }
+ /*
+ * Ensure that uid and gid are correct. This is a temporary
+ * fix until fsck has been changed to do the update.
+ */
+ if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
+ ip->i_uid = ip->i_din.di_ouid; /* XXX */
+ ip->i_gid = ip->i_din.di_ogid; /* XXX */
+ } /* XXX */
+
+ *vpp = vp;
+ return (0);
+}
+
+/*
+ * File handle to vnode
+ *
+ * Have to be really careful about stale file handles:
+ * - check that the inode number is valid
+ * - call ffs_vget() to get the locked inode
+ * - check for an unallocated inode (i_mode == 0)
+ * - check that the given client host has export rights and return
+ * those rights via. exflagsp and credanonp
+ */
+int
+ffs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
+ register struct mount *mp;
+ struct fid *fhp;
+ struct mbuf *nam;
+ struct vnode **vpp;
+ int *exflagsp;
+ struct ucred **credanonp;
+{
+ register struct ufid *ufhp;
+ struct fs *fs;
+
+ ufhp = (struct ufid *)fhp;
+ fs = VFSTOUFS(mp)->um_fs;
+ if (ufhp->ufid_ino < ROOTINO ||
+ ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg)
+ return (ESTALE);
+ return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
+}
+
+/*
+ * Vnode pointer to File handle
+ */
+/* ARGSUSED */
+ffs_vptofh(vp, fhp)
+ struct vnode *vp;
+ struct fid *fhp;
+{
+ register struct inode *ip;
+ register struct ufid *ufhp;
+
+ ip = VTOI(vp);
+ ufhp = (struct ufid *)fhp;
+ ufhp->ufid_len = sizeof(struct ufid);
+ ufhp->ufid_ino = ip->i_number;
+ ufhp->ufid_gen = ip->i_gen;
+ return (0);
+}
+
projects / unix-history / blobdiff