1 files changed, 524 insertions, 0 deletions
diff --git a/usr/src/uts/common/fs/dev/sdev_vfsops.c b/usr/src/uts/common/fs/dev/sdev_vfsops.c
new file mode 100644
index 0000000000..6ecea19f3f
--- /dev/null
+++ b/usr/src/uts/common/fs/dev/sdev_vfsops.c
@@ -0,0 +1,524 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*
+ * This is the /dev (hence, the sdev_ prefix) filesystem.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/sysmacros.h>
+#include <sys/systm.h>
+#include <sys/kmem.h>
+#include <sys/time.h>
+#include <sys/pathname.h>
+#include <sys/vfs.h>
+#include <sys/vnode.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/uio.h>
+#include <sys/stat.h>
+#include <sys/errno.h>
+#include <sys/cmn_err.h>
+#include <sys/cred.h>
+#include <sys/statvfs.h>
+#include <sys/policy.h>
+#include <sys/mount.h>
+#include <sys/debug.h>
+#include <sys/modctl.h>
+#include <sys/mkdev.h>
+#include <fs/fs_subr.h>
+#include <sys/fs/sdev_impl.h>
+#include <sys/fs/sdev_node.h>
+#include <sys/fs/snode.h>
+#include <sys/fs/dv_node.h>
+#include <sys/sunndi.h>
+#include <sys/mntent.h>
+
+/*
+ * /dev vfs operations.
+ */
+
+/*
+ * globals
+ */
+struct sdev_data *sdev_origins; /* mount info for origins under /dev */
+
+/*
+ * static
+ */
+static kmutex_t sdev_lock;	/* protects global data */
+static major_t devmajor;	/* the fictitious major we live on */
+static major_t devminor;	/* the fictitious minor of this instance */
+static struct sdev_data *sdev_mntinfo = NULL;	/* linked list of instances */
+static struct vnode *sdev_stale_attrvp; /* stale root attrvp after remount */
+static int sdev_mntinfo_cnt;	/* mntinfo reference count */
+
+static int sdev_mount(struct vfs *, struct vnode *, struct mounta *,
+    struct cred *);
+static int sdev_unmount(struct vfs *, int, struct cred *);
+static int sdev_root(struct vfs *, struct vnode **);
+static int sdev_statvfs(struct vfs *, struct statvfs64 *);
+static void sdev_insert_mntinfo(struct sdev_data *);
+static int devinit(int, char *);
+
+static vfsdef_t sdev_vfssw = {
+	VFSDEF_VERSION,
+	"dev",		/* type name string */
+	devinit,	/* init routine */
+	VSW_CANREMOUNT,	/* flags */
+	NULL		/* mount options table prototype */
+};
+
+
+/*
+ * Module linkage information
+ */
+static struct modlfs modlfs = {
+	&mod_fsops, "/dev filesystem %I%", &sdev_vfssw
+};
+
+static struct modlinkage modlinkage = {
+	MODREV_1, (void *)&modlfs, NULL
+};
+
+int
+_init(void)
+{
+	int e;
+
+	mutex_init(&sdev_lock, NULL, MUTEX_DEFAULT, NULL);
+	sdev_node_cache_init();
+	sdev_devfsadm_lockinit();
+	if ((e = mod_install(&modlinkage)) != 0) {
+		sdev_devfsadm_lockdestroy();
+		sdev_node_cache_fini();
+		mutex_destroy(&sdev_lock);
+		return (e);
+	}
+	return (0);
+}
+
+/*
+ * dev module remained loaded for the global /dev instance
+ */
+int
+_fini(void)
+{
+	return (EBUSY);
+}
+
+int
+_info(struct modinfo *modinfop)
+{
+	return (mod_info(&modlinkage, modinfop));
+}
+
+/*ARGSUSED*/
+static int
+devinit(int fstype, char *name)
+{
+	static const fs_operation_def_t dev_vfsops_tbl[] = {
+		VFSNAME_MOUNT, sdev_mount,	/* mount file system */
+		VFSNAME_UNMOUNT, sdev_unmount,	/* unmount file system */
+		VFSNAME_ROOT, sdev_root,	/* get root vnode */
+		VFSNAME_STATVFS, sdev_statvfs,	/* get file system statistics */
+		NULL, NULL
+	};
+
+	int	error;
+	extern major_t getudev(void);
+
+	devtype = fstype;
+
+	error = vfs_setfsops(fstype, dev_vfsops_tbl, NULL);
+	if (error != 0) {
+		cmn_err(CE_WARN, "devinit: bad vfs ops tbl");
+		return (error);
+	}
+
+	error = vn_make_ops("dev", sdev_vnodeops_tbl, &sdev_vnodeops);
+	if (error != 0) {
+		(void) vfs_freevfsops_by_type(fstype);
+		cmn_err(CE_WARN, "devinit: bad vnode ops tbl");
+		return (error);
+	}
+
+	if ((devmajor = getudev()) == (major_t)-1) {
+		cmn_err(CE_WARN, "%s: can't get unique dev", sdev_vfssw.name);
+		return (1);
+	}
+
+	/* initialize negative cache */
+	sdev_ncache_init();
+
+	return (0);
+}
+
+/*
+ * Both mount point and backing store directory name are
+ * passed in from userland
+ */
+static int
+sdev_mount(struct vfs *vfsp, struct vnode *mvp, struct mounta *uap,
+    struct cred *cr)
+{
+	struct sdev_data *sdev_data;
+	struct vnode *avp;
+	struct sdev_node *dv;
+	struct sdev_mountargs *args = NULL;
+	int	error = 0;
+	dev_t	devdev;
+
+	/*
+	 * security check
+	 */
+	if ((secpolicy_fs_mount(cr, mvp, vfsp) != 0) ||
+	    (secpolicy_sys_devices(cr) != 0))
+		return (EPERM);
+
+	/*
+	 * Sanity check the mount point
+	 */
+	if (mvp->v_type != VDIR)
+		return (ENOTDIR);
+
+	/*
+	 * Sanity Check for overlay mount.
+	 */
+	mutex_enter(&mvp->v_lock);
+	if ((uap->flags & MS_OVERLAY) == 0 &&
+	    (uap->flags & MS_REMOUNT) == 0 &&
+	    (mvp->v_count > 1 || (mvp->v_flag & VROOT))) {
+		mutex_exit(&mvp->v_lock);
+		return (EBUSY);
+	}
+	mutex_exit(&mvp->v_lock);
+
+	args = kmem_zalloc(sizeof (*args), KM_SLEEP);
+
+	if ((uap->flags & MS_DATA) &&
+	    (uap->datalen != 0 && uap->dataptr != NULL)) {
+		/* copy in the arguments */
+		if (error = sdev_copyin_mountargs(uap, args))
+			goto cleanup;
+	}
+
+	/*
+	 * Sanity check the backing store
+	 */
+	if (args->sdev_attrdir) {
+		/* user supplied an attribute store */
+		if (error = lookupname((char *)(uintptr_t)args->sdev_attrdir,
+		    UIO_USERSPACE, FOLLOW, NULLVPP, &avp)) {
+			cmn_err(CE_NOTE, "/dev fs: lookup on attribute "
+			    "directory %s failed",
+			    (char *)(uintptr_t)args->sdev_attrdir);
+			goto cleanup;
+		}
+
+		if (avp->v_type != VDIR) {
+			VN_RELE(avp);
+			error = ENOTDIR;
+			goto cleanup;
+		}
+	} else {
+		/* use mountp as the attribute store */
+		avp = mvp;
+		VN_HOLD(avp);
+	}
+
+	mutex_enter(&sdev_lock);
+
+	/*
+	 * handling installation
+	 */
+	if (uap->flags & MS_REMOUNT) {
+		sdev_data = (struct sdev_data *)vfsp->vfs_data;
+		ASSERT(sdev_data);
+
+		dv = sdev_data->sdev_root;
+		ASSERT(dv == dv->sdev_dotdot);
+
+		/*
+		 * mark all existing sdev_nodes (except root node) stale
+		 */
+		sdev_stale(dv);
+
+		/* Reset previous mountargs */
+		if (sdev_data->sdev_mountargs) {
+			kmem_free(sdev_data->sdev_mountargs,
+			    sizeof (struct sdev_mountargs));
+		}
+		sdev_data->sdev_mountargs = args;
+		args = NULL;		/* so it won't be freed below */
+
+		sdev_stale_attrvp = dv->sdev_attrvp;
+		dv->sdev_attrvp = avp;
+		vfsp->vfs_mtime = ddi_get_time();
+
+		mutex_exit(&sdev_lock);
+		goto cleanup;				/* we're done */
+	}
+
+	/*
+	 * Create and initialize the vfs-private data.
+	 */
+	devdev = makedevice(devmajor, devminor);
+	while (vfs_devismounted(devdev)) {
+		devminor = (devminor + 1) & MAXMIN32;
+
+		/*
+		 * All the minor numbers are used up.
+		 */
+		if (devminor == 0) {
+			mutex_exit(&sdev_lock);
+			VN_RELE(avp);
+			error = ENODEV;
+			goto cleanup;
+		}
+
+		devdev = makedevice(devmajor, devminor);
+	}
+
+	dv = sdev_mkroot(vfsp, devdev, mvp, avp, cr);
+	sdev_data = kmem_zalloc(sizeof (struct sdev_data), KM_SLEEP);
+	vfsp->vfs_dev = devdev;
+	vfsp->vfs_data = (caddr_t)sdev_data;
+	vfsp->vfs_fstype = devtype;
+	vfsp->vfs_bsize = DEV_BSIZE;
+	vfsp->vfs_mtime = ddi_get_time();
+	vfs_make_fsid(&vfsp->vfs_fsid, vfsp->vfs_dev, devtype);
+
+	ASSERT(dv == dv->sdev_dotdot);
+
+	sdev_data->sdev_vfsp = vfsp;
+	sdev_data->sdev_root = dv;
+	sdev_data->sdev_mountargs = args;
+
+	/* get acl flavor from attribute dir */
+	if (VOP_PATHCONF(avp, _PC_ACL_ENABLED, &sdev_data->sdev_acl_flavor,
+	    kcred) != 0 || sdev_data->sdev_acl_flavor == 0)
+		sdev_data->sdev_acl_flavor = _ACL_ACLENT_ENABLED;
+
+	args = NULL;			/* so it won't be freed below */
+	sdev_insert_mntinfo(sdev_data);
+	mutex_exit(&sdev_lock);
+
+	if (!SDEV_IS_GLOBAL(dv)) {
+		ASSERT(sdev_origins);
+		dv->sdev_flags &= ~SDEV_GLOBAL;
+		dv->sdev_origin = sdev_origins->sdev_root;
+	} else {
+		sdev_ncache_setup();
+	}
+
+	sdev_update_timestamps(dv->sdev_attrvp,
+		cr, AT_CTIME|AT_MTIME|AT_ATIME);
+
+cleanup:
+	if (args)
+		kmem_free(args, sizeof (*args));
+	return (error);
+}
+
+/*
+ * unmounting the non-global /dev instances, e.g. when deleting a Kevlar zone.
+ */
+static int
+sdev_unmount(struct vfs *vfsp, int flag, struct cred *cr)
+{
+	struct sdev_node *dv;
+	int error;
+	struct sdev_data *sdev_data, *prev, *next;
+
+	/*
+	 * enforce the security policies
+	 */
+	if ((secpolicy_fs_unmount(cr, vfsp) != 0) ||
+	    (secpolicy_sys_devices(cr) != 0))
+		return (EPERM);
+
+	if (flag & MS_FORCE)
+		return (ENOTSUP);
+
+	mutex_enter(&sdev_lock);
+	dv = VFSTOSDEVFS(vfsp)->sdev_root;
+	ASSERT(dv == dv->sdev_dotdot);
+	if (SDEVTOV(dv)->v_count > 1) {
+		mutex_exit(&sdev_lock);
+		return (EBUSY);
+	}
+
+	/*
+	 * global instance remains mounted
+	 */
+	if (SDEV_IS_GLOBAL(dv)) {
+		mutex_exit(&sdev_lock);
+		return (EBUSY);
+	}
+	mutex_exit(&sdev_lock);
+
+	/* verify the v_count */
+	if ((error = sdev_cleandir(dv, NULL, 0)) != 0) {
+		return (error);
+	}
+	ASSERT(SDEVTOV(dv)->v_count == 1);
+
+	/* release hold on root node and destroy it */
+	SDEV_RELE(dv);
+	dv->sdev_nlink -= 2;
+	sdev_nodedestroy(dv, 0);
+
+	sdev_data = (struct sdev_data *)vfsp->vfs_data;
+	vfsp->vfs_data = (caddr_t)0;
+
+	/*
+	 * XXX separate it into sdev_delete_mntinfo() if useful
+	 */
+	mutex_enter(&sdev_lock);
+	prev = sdev_data->sdev_prev;
+	next = sdev_data->sdev_next;
+	if (prev)
+		prev->sdev_next = next;
+	else
+		sdev_mntinfo = next;
+	if (next)
+		next->sdev_prev = prev;
+	mutex_exit(&sdev_lock);
+
+	if (sdev_data->sdev_mountargs) {
+		kmem_free(sdev_data->sdev_mountargs,
+		    sizeof (struct sdev_mountargs));
+	}
+	kmem_free(sdev_data, sizeof (struct sdev_data));
+	return (0);
+}
+
+/*
+ * return root vnode for given vfs
+ */
+static int
+sdev_root(struct vfs *vfsp, struct vnode **vpp)
+{
+	*vpp = SDEVTOV(VFSTOSDEVFS(vfsp)->sdev_root);
+	VN_HOLD(*vpp);
+	return (0);
+}
+
+/*
+ * return 'generic superblock' information to userland.
+ *
+ * not much that we can usefully admit to here
+ */
+static int
+sdev_statvfs(struct vfs *vfsp, struct statvfs64 *sbp)
+{
+	dev32_t d32;
+
+	bzero(sbp, sizeof (*sbp));
+	sbp->f_frsize = sbp->f_bsize = vfsp->vfs_bsize;
+	sbp->f_files = kmem_cache_stat(sdev_node_cache, "alloc");
+
+	/* no illusions that free/avail files is relevant to dev */
+	sbp->f_ffree = 0;
+	sbp->f_favail = 0;
+
+	/* no illusions that blocks are relevant to devfs */
+	sbp->f_bfree = 0;
+	sbp->f_bavail = 0;
+	sbp->f_blocks = 0;
+
+	(void) cmpldev(&d32, vfsp->vfs_dev);
+	sbp->f_fsid = d32;
+	(void) strcpy(sbp->f_basetype, vfssw[devtype].vsw_name);
+	sbp->f_flag = vf_to_stf(vfsp->vfs_flag);
+	sbp->f_namemax = MAXNAMELEN - 1;
+	(void) strcpy(sbp->f_fstr, "dev");
+
+	return (0);
+}
+
+int
+sdev_module_register(char *mod_name, struct devname_ops *dev_ops)
+{
+	struct devname_nsmap *map = NULL;
+
+	if (strcmp(mod_name, DEVNAME_NSCONFIG) == 0) {
+		devname_ns_ops = dev_ops;
+		return (0);
+	}
+
+	map = sdev_get_nsmap_by_module(mod_name);
+	if (map == NULL)
+		return (EFAULT);
+
+	rw_enter(&map->dir_lock, RW_WRITER);
+	map->dir_ops = dev_ops;
+	rw_exit(&map->dir_lock);
+	return (0);
+}
+
+static void
+sdev_insert_mntinfo(struct sdev_data *data)
+{
+	ASSERT(mutex_owned(&sdev_lock));
+	data->sdev_next = sdev_mntinfo;
+	data->sdev_prev = NULL;
+	if (sdev_mntinfo) {
+		sdev_mntinfo->sdev_prev = data;
+	} else {
+		sdev_origins = data;
+	}
+	sdev_mntinfo = data;
+}
+
+struct sdev_data *
+sdev_find_mntinfo(char *mntpt)
+{
+	struct sdev_data *mntinfo;
+
+	mutex_enter(&sdev_lock);
+	mntinfo = sdev_mntinfo;
+	while (mntinfo) {
+		if (strcmp(mntpt, mntinfo->sdev_root->sdev_name) == 0) {
+			SDEVTOV(mntinfo->sdev_root)->v_count++;
+			break;
+		}
+		mntinfo = mntinfo->sdev_next;
+	}
+	mutex_exit(&sdev_lock);
+	return (mntinfo);
+}
+
+void
+sdev_mntinfo_rele(struct sdev_data *mntinfo)
+{
+	mutex_enter(&sdev_lock);
+	SDEVTOV(mntinfo->sdev_root)->v_count--;
+	mutex_exit(&sdev_lock);
+}