1 files changed, 776 insertions, 0 deletions

diff --git a/sys/fs/nandfs/nandfs_cpfile.c b/sys/fs/nandfs/nandfs_cpfile.c
new file mode 100644
index 0000000..8814fc0
--- /dev/null
+++ b/sys/fs/nandfs/nandfs_cpfile.c
@@ -0,0 +1,776 @@
+/*-
+ * Copyright (c) 2010-2012 Semihalf.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mount.h>
+#include <sys/mutex.h>
+#include <sys/namei.h>
+#include <sys/sysctl.h>
+#include <sys/vnode.h>
+#include <sys/buf.h>
+#include <sys/bio.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_page.h>
+
+#include "nandfs_mount.h"
+#include "nandfs.h"
+#include "nandfs_subr.h"
+
+
+static int
+nandfs_checkpoint_size(struct nandfs_device *fsdev)
+{
+
+	return (fsdev->nd_fsdata.f_checkpoint_size);
+}
+
+static int
+nandfs_checkpoint_blk_offset(struct nandfs_device *fsdev, uint64_t cn,
+    uint64_t *blk, uint64_t *offset)
+{
+	uint64_t off;
+	uint16_t cp_size, cp_per_blk;
+
+	KASSERT((cn), ("checkpoing cannot be zero"));
+
+	cp_size = fsdev->nd_fsdata.f_checkpoint_size;
+	cp_per_blk = fsdev->nd_blocksize / cp_size;
+	off = roundup(sizeof(struct nandfs_cpfile_header), cp_size) / cp_size;
+	off += (cn - 1);
+
+	*blk = off / cp_per_blk;
+	*offset = (off % cp_per_blk) * cp_size;
+
+	return (0);
+}
+
+static int
+nandfs_checkpoint_blk_remaining(struct nandfs_device *fsdev, uint64_t cn,
+    uint64_t blk, uint64_t offset)
+{
+	uint16_t cp_size, cp_remaining;
+
+	cp_size = fsdev->nd_fsdata.f_checkpoint_size;
+	cp_remaining = (fsdev->nd_blocksize - offset) / cp_size;
+
+	return (cp_remaining);
+}
+
+int
+nandfs_get_checkpoint(struct nandfs_device *fsdev, struct nandfs_node *cp_node,
+    uint64_t cn)
+{
+	struct buf *bp;
+	uint64_t blk, offset;
+	int error;
+
+	if (cn != fsdev->nd_last_cno && cn != (fsdev->nd_last_cno + 1)) {
+		return (-1);
+	}
+
+	error = nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (-1);
+	}
+
+	error = nandfs_dirty_buf(bp, 0);
+	if (error)
+		return (-1);
+
+
+	nandfs_checkpoint_blk_offset(fsdev, cn, &blk, &offset);
+
+	if (blk != 0) {
+		if (blk < cp_node->nn_inode.i_blocks)
+			error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+		else
+			error = nandfs_bcreate(cp_node, blk, NOCRED, 0, &bp);
+		if (error) {
+			if (bp)
+				brelse(bp);
+			return (-1);
+		}
+
+		nandfs_dirty_buf(bp, 1);
+	}
+
+	DPRINTF(CPFILE, ("%s: cn:%#jx entry block:%#jx offset:%#jx\n",
+	    __func__, (uintmax_t)cn, (uintmax_t)blk, (uintmax_t)offset));
+
+	return (0);
+}
+
+int
+nandfs_set_checkpoint(struct nandfs_device *fsdev, struct nandfs_node *cp_node,
+    uint64_t cn, struct nandfs_inode *ifile_inode, uint64_t nblocks)
+{
+	struct nandfs_cpfile_header *cnh;
+	struct nandfs_checkpoint *cnp;
+	struct buf *bp;
+	uint64_t blk, offset;
+	int error;
+
+	if (cn != fsdev->nd_last_cno && cn != (fsdev->nd_last_cno + 1)) {
+		nandfs_error("%s: trying to set invalid chekpoint %jx - %jx\n",
+		    __func__, cn, fsdev->nd_last_cno);
+		return (-1);
+	}
+
+	error = nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return error;
+	}
+
+	cnh = (struct nandfs_cpfile_header *) bp->b_data;
+	cnh->ch_ncheckpoints++;
+
+	nandfs_checkpoint_blk_offset(fsdev, cn, &blk, &offset);
+
+	if(blk != 0) {
+		brelse(bp);
+		error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return error;
+		}
+	}
+
+	cnp = (struct nandfs_checkpoint *)((uint8_t *)bp->b_data + offset);
+	cnp->cp_flags = 0;
+	cnp->cp_checkpoints_count = 1;
+	memset(&cnp->cp_snapshot_list, 0, sizeof(struct nandfs_snapshot_list));
+	cnp->cp_cno = cn;
+	cnp->cp_create = fsdev->nd_ts.tv_sec;
+	cnp->cp_nblk_inc = nblocks;
+	cnp->cp_blocks_count = 0;
+	memcpy (&cnp->cp_ifile_inode, ifile_inode, sizeof(cnp->cp_ifile_inode));
+
+	DPRINTF(CPFILE, ("%s: cn:%#jx ctime:%#jx nblk:%#jx\n",
+	    __func__, (uintmax_t)cn, (uintmax_t)cnp->cp_create,
+	    (uintmax_t)nblocks));
+
+	brelse(bp);
+	return (0);
+}
+
+static int
+nandfs_cp_mounted(struct nandfs_device *nandfsdev, uint64_t cno)
+{
+	struct nandfsmount *nmp;
+	int mounted = 0;
+
+	mtx_lock(&nandfsdev->nd_mutex);
+	/* No double-mounting of the same checkpoint */
+	STAILQ_FOREACH(nmp, &nandfsdev->nd_mounts, nm_next_mount) {
+		if (nmp->nm_mount_args.cpno == cno) {
+			mounted = 1;
+			break;
+		}
+	}
+	mtx_unlock(&nandfsdev->nd_mutex);
+
+	return (mounted);
+}
+
+static int
+nandfs_cp_set_snapshot(struct nandfs_node *cp_node, uint64_t cno)
+{
+	struct nandfs_device *fsdev;
+	struct nandfs_cpfile_header *cnh;
+	struct nandfs_checkpoint *cnp;
+	struct nandfs_snapshot_list *list;
+	struct buf *bp;
+	uint64_t blk, prev_blk, offset;
+	uint64_t curr, prev;
+	int error;
+
+	fsdev = cp_node->nn_nandfsdev;
+
+	/* Get snapshot data */
+	nandfs_checkpoint_blk_offset(fsdev, cno, &blk, &offset);
+	error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (error);
+	}
+	cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+	if (cnp->cp_flags & NANDFS_CHECKPOINT_INVALID) {
+		brelse(bp);
+		return (ENOENT);
+	}
+	if ((cnp->cp_flags & NANDFS_CHECKPOINT_SNAPSHOT)) {
+		brelse(bp);
+		return (EINVAL);
+	}
+
+	brelse(bp);
+	/* Get list from header */
+	error = nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (error);
+	}
+
+	cnh = (struct nandfs_cpfile_header *) bp->b_data;
+	list = &cnh->ch_snapshot_list;
+	prev = list->ssl_prev;
+	brelse(bp);
+	prev_blk = ~(0);
+	curr = 0;
+	while (prev > cno) {
+		curr = prev;
+		nandfs_checkpoint_blk_offset(fsdev, prev, &prev_blk, &offset);
+		error = nandfs_bread(cp_node, prev_blk, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+		cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+		list = &cnp->cp_snapshot_list;
+		prev = list->ssl_prev;
+		brelse(bp);
+	}
+
+	if (curr == 0) {
+		nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+		cnh = (struct nandfs_cpfile_header *) bp->b_data;
+		list = &cnh->ch_snapshot_list;
+	} else {
+		nandfs_checkpoint_blk_offset(fsdev, curr, &blk, &offset);
+		error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+		cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+		list = &cnp->cp_snapshot_list;
+	}
+
+	list->ssl_prev = cno;
+	error = nandfs_dirty_buf(bp, 0);
+	if (error)
+		return (error);
+
+
+	/* Update snapshot for cno */
+	nandfs_checkpoint_blk_offset(fsdev, cno, &blk, &offset);
+	error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (error);
+	}
+	cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+	list = &cnp->cp_snapshot_list;
+	list->ssl_prev = prev;
+	list->ssl_next = curr;
+	cnp->cp_flags |= NANDFS_CHECKPOINT_SNAPSHOT;
+	nandfs_dirty_buf(bp, 1);
+
+	if (prev == 0) {
+		nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+		cnh = (struct nandfs_cpfile_header *) bp->b_data;
+		list = &cnh->ch_snapshot_list;
+	} else {
+		/* Update snapshot list for prev */
+		nandfs_checkpoint_blk_offset(fsdev, prev, &blk, &offset);
+		error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+		cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+		list = &cnp->cp_snapshot_list;
+	}
+	list->ssl_next = cno;
+	nandfs_dirty_buf(bp, 1);
+
+	/* Update header */
+	error = nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (error);
+	}
+	cnh = (struct nandfs_cpfile_header *) bp->b_data;
+	cnh->ch_nsnapshots++;
+	nandfs_dirty_buf(bp, 1);
+
+	return (0);
+}
+
+static int
+nandfs_cp_clr_snapshot(struct nandfs_node *cp_node, uint64_t cno)
+{
+	struct nandfs_device *fsdev;
+	struct nandfs_cpfile_header *cnh;
+	struct nandfs_checkpoint *cnp;
+	struct nandfs_snapshot_list *list;
+	struct buf *bp;
+	uint64_t blk, offset, snapshot_cnt;
+	uint64_t next, prev;
+	int error;
+
+	fsdev = cp_node->nn_nandfsdev;
+
+	/* Get snapshot data */
+	nandfs_checkpoint_blk_offset(fsdev, cno, &blk, &offset);
+	error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (error);
+	}
+	cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+	if (cnp->cp_flags & NANDFS_CHECKPOINT_INVALID) {
+		brelse(bp);
+		return (ENOENT);
+	}
+	if (!(cnp->cp_flags & NANDFS_CHECKPOINT_SNAPSHOT)) {
+		brelse(bp);
+		return (EINVAL);
+	}
+
+	list = &cnp->cp_snapshot_list;
+	next = list->ssl_next;
+	prev = list->ssl_prev;
+	brelse(bp);
+
+	/* Get previous snapshot */
+	if (prev != 0) {
+		nandfs_checkpoint_blk_offset(fsdev, prev, &blk, &offset);
+		error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+		cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+		list = &cnp->cp_snapshot_list;
+	} else {
+		nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+		cnh = (struct nandfs_cpfile_header *) bp->b_data;
+		list = &cnh->ch_snapshot_list;
+	}
+
+	list->ssl_next = next;
+	error = nandfs_dirty_buf(bp, 0);
+	if (error)
+		return (error);
+
+	/* Get next snapshot */
+	if (next != 0) {
+		nandfs_checkpoint_blk_offset(fsdev, next, &blk, &offset);
+		error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+		cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+		list = &cnp->cp_snapshot_list;
+	} else {
+		nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+		cnh = (struct nandfs_cpfile_header *) bp->b_data;
+		list = &cnh->ch_snapshot_list;
+	}
+	list->ssl_prev = prev;
+	nandfs_dirty_buf(bp, 1);
+
+	/* Update snapshot list for cno */
+	nandfs_checkpoint_blk_offset(fsdev, cno, &blk, &offset);
+	error = nandfs_bread(cp_node, blk, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (error);
+	}
+	cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+	list = &cnp->cp_snapshot_list;
+	list->ssl_prev = 0;
+	list->ssl_next = 0;
+	cnp->cp_flags &= !NANDFS_CHECKPOINT_SNAPSHOT;
+	nandfs_dirty_buf(bp, 1);
+
+	/* Update header */
+	error = nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		return (error);
+	}
+	cnh = (struct nandfs_cpfile_header *) bp->b_data;
+	snapshot_cnt = cnh->ch_nsnapshots;
+	snapshot_cnt--;
+	cnh->ch_nsnapshots = snapshot_cnt;
+	nandfs_dirty_buf(bp, 1);
+
+	return (0);
+}
+
+int
+nandfs_chng_cpmode(struct nandfs_node *node, struct nandfs_cpmode *ncpm)
+{
+	struct nandfs_device *fsdev;
+	uint64_t cno = ncpm->ncpm_cno;
+	int mode = ncpm->ncpm_mode;
+	int ret;
+
+	fsdev = node->nn_nandfsdev;
+	VOP_LOCK(NTOV(node), LK_EXCLUSIVE);
+	switch (mode) {
+	case NANDFS_CHECKPOINT:
+		if (nandfs_cp_mounted(fsdev, cno)) {
+			ret = EBUSY;
+		} else
+			ret = nandfs_cp_clr_snapshot(node, cno);
+		break;
+	case NANDFS_SNAPSHOT:
+		ret = nandfs_cp_set_snapshot(node, cno);
+		break;
+	default:
+		ret = EINVAL;
+		break;
+	}
+	VOP_UNLOCK(NTOV(node), 0);
+
+	return (ret);
+}
+
+static void
+nandfs_cpinfo_fill(struct nandfs_checkpoint *cnp, struct nandfs_cpinfo *nci)
+{
+
+	nci->nci_flags = cnp->cp_flags;
+	nci->nci_pad = 0;
+	nci->nci_cno = cnp->cp_cno;
+	nci->nci_create = cnp->cp_create;
+	nci->nci_nblk_inc = cnp->cp_nblk_inc;
+	nci->nci_blocks_count = cnp->cp_blocks_count;
+	nci->nci_next = cnp->cp_snapshot_list.ssl_next;
+	DPRINTF(CPFILE, ("%s: cn:%#jx ctime:%#jx\n",
+	    __func__, (uintmax_t)cnp->cp_cno,
+	    (uintmax_t)cnp->cp_create));
+}
+
+static int
+nandfs_get_cpinfo_cp(struct nandfs_node *node, uint64_t cno,
+    struct nandfs_cpinfo *nci, uint32_t mnmembs, uint32_t *nmembs)
+{
+	struct nandfs_device *fsdev;
+	struct buf *bp;
+	uint64_t blk, offset, last_cno, i;
+	uint16_t remaining;
+	int error;
+#ifdef INVARIANTS
+	uint64_t testblk, testoffset;
+#endif
+
+	if (cno == 0) {
+		return (ENOENT);
+	}
+
+	if (mnmembs < 1) {
+		return (EINVAL);
+	}
+
+	fsdev = node->nn_nandfsdev;
+	last_cno = fsdev->nd_last_cno;
+	DPRINTF(CPFILE, ("%s: cno:%#jx mnmembs: %#jx last:%#jx\n", __func__,
+	    (uintmax_t)cno, (uintmax_t)mnmembs,
+	    (uintmax_t)fsdev->nd_last_cno));
+
+	/*
+	 * do {
+	 * 	get block
+	 * 	read checkpoints until we hit last checkpoint, end of block or
+	 * 	requested number
+	 * } while (last read checkpoint <= last checkpoint on fs &&
+	 * 		read checkpoints < request number);
+	 */
+	*nmembs = i = 0;
+	do {
+		nandfs_checkpoint_blk_offset(fsdev, cno, &blk, &offset);
+		remaining = nandfs_checkpoint_blk_remaining(fsdev, cno,
+		    blk, offset);
+		error = nandfs_bread(node, blk, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+
+		while (cno <= last_cno && i < mnmembs && remaining) {
+#ifdef INVARIANTS
+			nandfs_checkpoint_blk_offset(fsdev, cno, &testblk,
+			    &testoffset);
+			KASSERT(testblk == blk, ("testblk != blk"));
+			KASSERT(testoffset == offset, ("testoffset != offset"));
+#endif
+			DPRINTF(CPFILE, ("%s: cno %#jx\n", __func__,
+			    (uintmax_t)cno));
+
+			nandfs_cpinfo_fill((struct nandfs_checkpoint *)
+			    (bp->b_data + offset), nci);
+			offset += nandfs_checkpoint_size(fsdev);
+			i++;
+			nci++;
+			cno++;
+			(*nmembs)++;
+			remaining--;
+		}
+		brelse(bp);
+	} while (cno <= last_cno && i < mnmembs);
+
+	return (0);
+}
+
+static int
+nandfs_get_cpinfo_sp(struct nandfs_node *node, uint64_t cno,
+    struct nandfs_cpinfo *nci, uint32_t mnmembs, uint32_t *nmembs)
+{
+	struct nandfs_checkpoint *cnp;
+	struct nandfs_cpfile_header *cnh;
+	struct nandfs_device *fsdev;
+	struct buf *bp = NULL;
+	uint64_t curr = 0;
+	uint64_t blk, offset, curr_cno;
+	uint32_t flag;
+	int i, error;
+
+	if (cno == 0 || cno == ~(0))
+		return (ENOENT);
+
+	fsdev = node->nn_nandfsdev;
+	curr_cno = cno;
+
+	if (nmembs)
+		*nmembs = 0;
+	if (curr_cno == 1) {
+		/* Get list from header */
+		error = nandfs_bread(node, 0, NOCRED, 0, &bp);
+		if (error) {
+			brelse(bp);
+			return (error);
+		}
+		cnh = (struct nandfs_cpfile_header *) bp->b_data;
+		curr_cno = cnh->ch_snapshot_list.ssl_next;
+		brelse(bp);
+		bp = NULL;
+
+		/* No snapshots */
+		if (curr_cno == 0)
+			return (0);
+	}
+
+	for (i = 0; i < mnmembs; i++, nci++) {
+		nandfs_checkpoint_blk_offset(fsdev, curr_cno, &blk, &offset);
+		if (i == 0 || curr != blk) {
+			if (bp)
+				brelse(bp);
+			error = nandfs_bread(node, blk, NOCRED, 0, &bp);
+			if (error) {
+				brelse(bp);
+				return (ENOENT);
+			}
+			curr = blk;
+		}
+		cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+		flag = cnp->cp_flags;
+		if (!(flag & NANDFS_CHECKPOINT_SNAPSHOT) ||
+		    (flag & NANDFS_CHECKPOINT_INVALID))
+			break;
+
+		nci->nci_flags = flag;
+		nci->nci_pad = 0;
+		nci->nci_cno = cnp->cp_cno;
+		nci->nci_create = cnp->cp_create;
+		nci->nci_nblk_inc = cnp->cp_nblk_inc;
+		nci->nci_blocks_count = cnp->cp_blocks_count;
+		nci->nci_next = cnp->cp_snapshot_list.ssl_next;
+		if (nmembs)
+			(*nmembs)++;
+
+		curr_cno = nci->nci_next;
+		if (!curr_cno)
+			break;
+	}
+
+	brelse(bp);
+
+	return (0);
+}
+
+int
+nandfs_get_cpinfo(struct nandfs_node *node, uint64_t cno, uint16_t flags,
+    struct nandfs_cpinfo *nci, uint32_t nmembs, uint32_t *nnmembs)
+{
+	int error;
+
+	VOP_LOCK(NTOV(node), LK_EXCLUSIVE);
+	switch (flags) {
+	case NANDFS_CHECKPOINT:
+		error = nandfs_get_cpinfo_cp(node, cno, nci, nmembs, nnmembs);
+		break;
+	case NANDFS_SNAPSHOT:
+		error = nandfs_get_cpinfo_sp(node, cno, nci, nmembs, nnmembs);
+		break;
+	default:
+		error = EINVAL;
+		break;
+	}
+	VOP_UNLOCK(NTOV(node), 0);
+
+	return (error);
+}
+
+int
+nandfs_get_cpinfo_ioctl(struct nandfs_node *node, struct nandfs_argv *nargv)
+{
+	struct nandfs_cpinfo *nci;
+	uint64_t cno = nargv->nv_index;
+	void *buf = (void *)((uintptr_t)nargv->nv_base);
+	uint16_t flags = nargv->nv_flags;
+	uint32_t nmembs = 0;
+	int error;
+
+	if (nargv->nv_nmembs > NANDFS_CPINFO_MAX)
+		return (EINVAL);
+
+	nci = malloc(sizeof(struct nandfs_cpinfo) * nargv->nv_nmembs,
+	    M_NANDFSTEMP, M_WAITOK | M_ZERO);
+
+	error = nandfs_get_cpinfo(node, cno, flags, nci, nargv->nv_nmembs, &nmembs);
+
+	if (error == 0) {
+		nargv->nv_nmembs = nmembs;
+		error = copyout(nci, buf,
+		    sizeof(struct nandfs_cpinfo) * nmembs);
+	}
+
+	free(nci, M_NANDFSTEMP);
+	return (error);
+}
+
+int
+nandfs_delete_cp(struct nandfs_node *node, uint64_t start, uint64_t end)
+{
+	struct nandfs_checkpoint *cnp;
+	struct nandfs_device *fsdev;
+	struct buf *bp;
+	uint64_t cno = start, blk, offset;
+	int error;
+
+	DPRINTF(CPFILE, ("%s: delete cno %jx-%jx\n", __func__, start, end));
+	VOP_LOCK(NTOV(node), LK_EXCLUSIVE);
+	fsdev = node->nn_nandfsdev;
+	for (cno = start; cno <= end; cno++) {
+		if (!cno)
+			continue;
+
+		nandfs_checkpoint_blk_offset(fsdev, cno, &blk, &offset);
+		error = nandfs_bread(node, blk, NOCRED, 0, &bp);
+		if (error) {
+			VOP_UNLOCK(NTOV(node), 0);
+			brelse(bp);
+			return (error);
+		}
+
+		cnp = (struct nandfs_checkpoint *)(bp->b_data + offset);
+		if (cnp->cp_flags & NANDFS_CHECKPOINT_SNAPSHOT) {
+			brelse(bp);
+			VOP_UNLOCK(NTOV(node), 0);
+			return (0);
+		}
+
+		cnp->cp_flags |= NANDFS_CHECKPOINT_INVALID;
+
+		error = nandfs_dirty_buf(bp, 0);
+		if (error)
+			return (error);
+	}
+	VOP_UNLOCK(NTOV(node), 0);
+
+	return (0);
+}
+
+int
+nandfs_make_snap(struct nandfs_device *fsdev, uint64_t *cno)
+{
+	struct nandfs_cpmode cpm;
+	int error;
+
+	*cno = cpm.ncpm_cno = fsdev->nd_last_cno;
+	cpm.ncpm_mode = NANDFS_SNAPSHOT;
+	error = nandfs_chng_cpmode(fsdev->nd_cp_node, &cpm);
+	return (error);
+}
+
+int
+nandfs_delete_snap(struct nandfs_device *fsdev, uint64_t cno)
+{
+	struct nandfs_cpmode cpm;
+	int error;
+
+	cpm.ncpm_cno = cno;
+	cpm.ncpm_mode = NANDFS_CHECKPOINT;
+	error = nandfs_chng_cpmode(fsdev->nd_cp_node, &cpm);
+	return (error);
+}
+
+int nandfs_get_cpstat(struct nandfs_node *cp_node, struct nandfs_cpstat *ncp)
+{
+	struct nandfs_device *fsdev;
+	struct nandfs_cpfile_header *cnh;
+	struct buf *bp;
+	int error;
+
+	VOP_LOCK(NTOV(cp_node), LK_EXCLUSIVE);
+	fsdev = cp_node->nn_nandfsdev;
+
+	/* Get header */
+	error = nandfs_bread(cp_node, 0, NOCRED, 0, &bp);
+	if (error) {
+		brelse(bp);
+		VOP_UNLOCK(NTOV(cp_node), 0);
+		return (error);
+	}
+	cnh = (struct nandfs_cpfile_header *) bp->b_data;
+	ncp->ncp_cno = fsdev->nd_last_cno;
+	ncp->ncp_ncps = cnh->ch_ncheckpoints;
+	ncp->ncp_nss = cnh->ch_nsnapshots;
+	DPRINTF(CPFILE, ("%s: cno:%#jx ncps:%#jx nss:%#jx\n",
+	    __func__, ncp->ncp_cno, ncp->ncp_ncps, ncp->ncp_nss));
+	brelse(bp);
+	VOP_UNLOCK(NTOV(cp_node), 0);
+
+	return (0);
+}