diff --git a/fs/zuf/file.c b/fs/zuf/file.c
index 58142c825230..b7657e8c7e0a 100644
--- a/fs/zuf/file.c
+++ b/fs/zuf/file.c
@@ -15,12 +15,158 @@
 
 #include <linux/fs.h>
 #include <linux/uio.h>
+#include <linux/falloc.h>
+#include <linux/fadvise.h>
+#include <linux/sched/signal.h>
 
 #include "zuf.h"
 
 long __zuf_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
 {
-	return -ENOTSUPP;
+	struct zuf_inode_info *zii = ZUII(inode);
+	bool need_len_check, need_unmap;
+	loff_t unmap_len = 0; /* 0 means all file */
+	loff_t new_size = len + offset;
+	loff_t i_size = i_size_read(inode);
+	int err = 0;
+
+	zuf_dbg_vfs("[%ld] mode=0x%x offset=0x%llx len=0x%llx\n",
+		     inode->i_ino, mode, offset, len);
+
+	if (!S_ISREG(inode->i_mode))
+		return -EINVAL;
+	if (IS_SWAPFILE(inode))
+		return -ETXTBSY;
+
+	/* These are all the FL flags we know how to handle on the  kernel side
+	 * a zusFS that does not support one of these can just return
+	 * EOPNOTSUPP.
+	 */
+	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
+		     FALLOC_FL_NO_HIDE_STALE | FALLOC_FL_COLLAPSE_RANGE |
+		     FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE |
+		     FALLOC_FL_UNSHARE_RANGE | ZUFS_FL_TRUNCATE)){
+		zuf_dbg_err("Unsupported mode(0x%x)\n", mode);
+		return -EOPNOTSUPP;
+	}
+
+	if (mode & FALLOC_FL_PUNCH_HOLE) {
+		need_len_check = false;
+		need_unmap = true;
+		unmap_len = len;
+	} else if (mode & ZUFS_FL_TRUNCATE) {
+		need_len_check = true;
+		new_size = offset;
+		need_unmap = true;
+	} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
+		need_len_check = false;
+		need_unmap = true;
+	} else if (mode & FALLOC_FL_INSERT_RANGE) {
+		need_len_check = true;
+		new_size = i_size + len;
+		need_unmap = true;
+	} else if (mode & FALLOC_FL_ZERO_RANGE) {
+		need_len_check = !(mode & FALLOC_FL_KEEP_SIZE);
+		need_unmap = true;
+	} else {
+		/* FALLOC_FL_UNSHARE_RANGE same as regular */
+		need_len_check = !(mode & FALLOC_FL_KEEP_SIZE);
+		need_unmap = false;
+	}
+
+	if (need_len_check && (new_size > i_size)) {
+		err = inode_newsize_ok(inode, new_size);
+		if (unlikely(err)) {
+			zuf_dbg_err("inode_newsize_ok(0x%llx) => %d\n",
+				    new_size, err);
+			goto out;
+		}
+	}
+
+	if (need_unmap) {
+		zufc_goose_all_zts(ZUF_ROOT(SBI(inode->i_sb)), inode);
+		unmap_mapping_range(inode->i_mapping, offset, unmap_len, 1);
+	}
+
+	zus_inode_cmtime_now(inode, zii->zi);
+
+	err = zuf_rw_fallocate(inode, mode, offset, len);
+
+	/* Even if we had an error these might have changed */
+	i_size_write(inode, le64_to_cpu(zii->zi->i_size));
+	inode->i_blocks = le64_to_cpu(zii->zi->i_blocks);
+
+out:
+	return err;
+}
+
+static long zuf_fallocate(struct file *file, int mode, loff_t offset,
+			  loff_t len)
+{
+	struct inode *inode = file->f_inode;
+	struct zuf_inode_info *zii = ZUII(inode);
+	int err;
+
+	zuf_w_lock(zii);
+
+	err = __zuf_fallocate(inode, mode, offset, len);
+
+	zuf_w_unlock(zii);
+	return err;
+}
+
+static loff_t zuf_llseek(struct file *file, loff_t offset, int whence)
+{
+	struct inode *inode = file->f_path.dentry->d_inode;
+	struct zuf_inode_info *zii = ZUII(inode);
+	struct zufs_ioc_seek ioc_seek = {
+		.hdr.in_len = sizeof(ioc_seek),
+		.hdr.out_len = sizeof(ioc_seek),
+		.hdr.operation = ZUFS_OP_LLSEEK,
+		.zus_ii = zii->zus_ii,
+		.offset_in = offset,
+		.whence = whence,
+	};
+	int err = 0;
+
+	zuf_dbg_vfs("[%ld] offset=0x%llx whence=%d\n",
+		     inode->i_ino, offset, whence);
+
+	if (whence != SEEK_DATA && whence != SEEK_HOLE)
+		return generic_file_llseek(file, offset, whence);
+
+	zuf_r_lock(zii);
+
+	if ((offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) ||
+	    offset > inode->i_sb->s_maxbytes) {
+		err = -EINVAL;
+		goto out;
+	} else if (inode->i_size <= offset) {
+		err = -ENXIO;
+		goto out;
+	} else if (!inode->i_blocks) {
+		if (whence == SEEK_HOLE)
+			ioc_seek.offset_out = i_size_read(inode);
+		else
+			err = -ENXIO;
+		goto out;
+	}
+
+	err = zufc_dispatch(ZUF_ROOT(SBI(inode->i_sb)), &ioc_seek.hdr, NULL, 0);
+	if (unlikely(err)) {
+		zuf_dbg_err("zufc_dispatch failed => %d\n", err);
+		goto out;
+	}
+
+	if (ioc_seek.offset_out != file->f_pos) {
+		file->f_pos = ioc_seek.offset_out;
+		file->f_version = 0;
+	}
+
+out:
+	zuf_r_unlock(zii);
+
+	return err ?: ioc_seek.offset_out;
 }
 
 /* This function is called by both msync() and fsync(). */
@@ -87,6 +233,494 @@ static int zuf_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 	return zuf_isync(file_inode(file), start, end, datasync);
 }
 
+/* This callback is called when a file is closed */
+static int zuf_flush(struct file *file, fl_owner_t id)
+{
+	zuf_dbg_vfs("[%ld]\n", file->f_inode->i_ino);
+
+	return 0;
+}
+
+static int zuf_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+		      u64 offset, u64 len)
+{
+	struct super_block *sb = inode->i_sb;
+	struct zuf_inode_info *zii = ZUII(inode);
+	struct zufs_ioc_fiemap ioc_fiemap = {
+		.hdr.operation = ZUFS_OP_FIEMAP,
+		.hdr.in_len = sizeof(ioc_fiemap),
+		.hdr.out_len = sizeof(ioc_fiemap),
+		.zus_ii = zii->zus_ii,
+		.start = offset,
+		.length = len,
+		.flags = fieinfo->fi_flags,
+	};
+	struct page *pages[ZUS_API_MAP_MAX_PAGES];
+	uint nump = 0, extents_max = 0;
+	int i, err;
+
+	zuf_dbg_vfs("[%ld] offset=0x%llx len=0x%llx extents_max=%u flags=0x%x\n",
+		    inode->i_ino, offset, len, fieinfo->fi_extents_max,
+		    fieinfo->fi_flags);
+
+	/* TODO: Have support for FIEMAP_FLAG_XATTR */
+	err = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
+	if (unlikely(err))
+		return err;
+
+	if (likely(fieinfo->fi_extents_max)) {
+		ulong start = (ulong)fieinfo->fi_extents_start;
+		ulong len = fieinfo->fi_extents_max *
+						sizeof(struct fiemap_extent);
+		ulong offset = start & (PAGE_SIZE - 1);
+		ulong end_offset = (offset + len) & (PAGE_SIZE - 1);
+		ulong __len;
+		uint nump_r;
+
+		nump = md_o2p_up(offset + len);
+		if (ARRAY_SIZE(pages) < nump) {
+			nump = ARRAY_SIZE(pages);
+			end_offset = 0;
+		}
+
+		nump_r = get_user_pages_fast(start, nump, WRITE, pages);
+		if (unlikely(nump != nump_r))
+			return -EFAULT;
+
+		__len = nump * PAGE_SIZE - offset;
+		if (end_offset)
+			__len -= (PAGE_SIZE - end_offset);
+
+		extents_max = __len / sizeof(struct fiemap_extent);
+
+		ioc_fiemap.hdr.len = extents_max * sizeof(struct fiemap_extent);
+		ioc_fiemap.hdr.offset = offset;
+	}
+	ioc_fiemap.extents_max = extents_max;
+
+	zuf_r_lock(zii);
+
+	err = zufc_dispatch(ZUF_ROOT(SBI(sb)), &ioc_fiemap.hdr, pages, nump);
+	if (unlikely(err)) {
+		zuf_dbg_err("zufs_dispatch failed => %d\n", err);
+		goto out;
+	}
+
+	fieinfo->fi_extents_mapped = ioc_fiemap.extents_mapped;
+	if (unlikely(extents_max &&
+		     (extents_max < ioc_fiemap.extents_mapped))) {
+		zuf_err("extents_max=%d extents_mapped=%d\n", extents_max,
+			ioc_fiemap.extents_mapped);
+		err = -EINVAL;
+	}
+
+out:
+	zuf_r_unlock(zii);
+
+	for (i = 0; i < nump; ++i)
+		put_page(pages[i]);
+
+	return err;
+}
+
+/* ~~~~~ clone/copy range ~~~~~ */
+
+/*
+ * Copy/paste from Kernel mm/filemap.c::generic_remap_checks
+ * FIXME: make it EXPORT_GPL
+ */
+static int _access_check_limits(struct file *file, loff_t pos,
+				       loff_t *count)
+{
+	struct inode *inode = file->f_mapping->host;
+	loff_t max_size = inode->i_sb->s_maxbytes;
+
+	if (!(file->f_flags & O_LARGEFILE))
+		max_size = MAX_NON_LFS;
+
+	if (unlikely(pos >= max_size))
+		return -EFBIG;
+	*count = min(*count, max_size - pos);
+	return 0;
+}
+
+static int _write_check_limits(struct file *file, loff_t pos,
+				      loff_t *count)
+{
+
+	loff_t limit = rlimit(RLIMIT_FSIZE);
+
+	if (limit != RLIM_INFINITY) {
+		if (pos >= limit) {
+			send_sig(SIGXFSZ, current, 0);
+			return -EFBIG;
+		}
+		*count = min(*count, limit - pos);
+	}
+
+	return _access_check_limits(file, pos, count);
+}
+
+static int _remap_checks(struct file *file_in, loff_t pos_in,
+			 struct file *file_out, loff_t pos_out,
+			 loff_t *req_count, unsigned int remap_flags)
+{
+	struct inode *inode_in = file_in->f_mapping->host;
+	struct inode *inode_out = file_out->f_mapping->host;
+	uint64_t count = *req_count;
+	uint64_t bcount;
+	loff_t size_in, size_out;
+	loff_t bs = inode_out->i_sb->s_blocksize;
+	int ret;
+
+	/* The start of both ranges must be aligned to an fs block. */
+	if (!IS_ALIGNED(pos_in, bs) || !IS_ALIGNED(pos_out, bs))
+		return -EINVAL;
+
+	/* Ensure offsets don't wrap. */
+	if (pos_in + count < pos_in || pos_out + count < pos_out)
+		return -EINVAL;
+
+	size_in = i_size_read(inode_in);
+	size_out = i_size_read(inode_out);
+
+	/* Dedupe requires both ranges to be within EOF. */
+	if ((remap_flags & REMAP_FILE_DEDUP) &&
+	    (pos_in >= size_in || pos_in + count > size_in ||
+	     pos_out >= size_out || pos_out + count > size_out))
+		return -EINVAL;
+
+	/* Ensure the infile range is within the infile. */
+	if (pos_in >= size_in)
+		return -EINVAL;
+	count = min(count, size_in - (uint64_t)pos_in);
+
+	ret = _access_check_limits(file_in, pos_in, &count);
+	if (ret)
+		return ret;
+
+	ret = _write_check_limits(file_out, pos_out, &count);
+	if (ret)
+		return ret;
+
+	/*
+	 * If the user wanted us to link to the infile's EOF, round up to the
+	 * next block boundary for this check.
+	 *
+	 * Otherwise, make sure the count is also block-aligned, having
+	 * already confirmed the starting offsets' block alignment.
+	 */
+	if (pos_in + count == size_in) {
+		bcount = ALIGN(size_in, bs) - pos_in;
+	} else {
+		if (!IS_ALIGNED(count, bs))
+			count = ALIGN_DOWN(count, bs);
+		bcount = count;
+	}
+
+	/* Don't allow overlapped cloning within the same file. */
+	if (inode_in == inode_out &&
+	    pos_out + bcount > pos_in &&
+	    pos_out < pos_in + bcount)
+		return -EINVAL;
+
+	/*
+	 * We shortened the request but the caller can't deal with that, so
+	 * bounce the request back to userspace.
+	 */
+	if (*req_count != count && !(remap_flags & REMAP_FILE_CAN_SHORTEN))
+		return -EINVAL;
+
+	*req_count = count;
+	return 0;
+}
+
+/*
+ * Copy/paste from generic_remap_file_range_prep(). We cannot call
+ * generic_remap_file_range_prep because it calles fsync twice and we do not
+ * want to go to the Server so many times.
+ * So below is just the checks.
+ * FIXME: Send a patch upstream to split the generic_remap_file_range_prep
+ * or receive a flag if to do the syncs
+ *
+ * Check that the two inodes are eligible for cloning, the ranges make
+ * sense.
+ *
+ * If there's an error, then the usual negative error code is returned.
+ * Otherwise returns 0 with *len set to the request length.
+ */
+static int _remap_file_range_prep(struct file *file_in, loff_t pos_in,
+				  struct file *file_out, loff_t pos_out,
+				  loff_t *len, unsigned int remap_flags)
+{
+	struct inode *inode_in = file_inode(file_in);
+	struct inode *inode_out = file_inode(file_out);
+	int ret;
+
+	/* Don't touch certain kinds of inodes */
+	if (IS_IMMUTABLE(inode_out))
+		return -EPERM;
+
+	if (IS_SWAPFILE(inode_in) || IS_SWAPFILE(inode_out))
+		return -ETXTBSY;
+
+	/* Don't reflink dirs, pipes, sockets... */
+	if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
+		return -EISDIR;
+	if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
+		return -EINVAL;
+
+	/* Zero length dedupe exits immediately; reflink goes to EOF. */
+	if (*len == 0) {
+		loff_t isize = i_size_read(inode_in);
+
+		if ((remap_flags & REMAP_FILE_DEDUP) || pos_in == isize)
+			return 0;
+		if (pos_in > isize)
+			return -EINVAL;
+		*len = isize - pos_in;
+		if (*len == 0)
+			return 0;
+	}
+
+	/* Check that we don't violate system file offset limits. */
+	ret = _remap_checks(file_in, pos_in, file_out, pos_out, len,
+			    remap_flags);
+	if (ret)
+		return ret;
+
+	/*
+	 * REMAP_FILE_DEDUP see if extents are the same.
+	 */
+	if (remap_flags & REMAP_FILE_DEDUP)
+		ret = zuf_rw_file_range_compare(inode_in, pos_in,
+						inode_out, pos_out, *len);
+
+	return ret;
+}
+
+static void _lock_two_ziis(struct zuf_inode_info *zii1,
+			   struct zuf_inode_info *zii2)
+{
+	if (zii1 > zii2)
+		swap(zii2, zii2);
+
+	zuf_w_lock(zii1);
+	if (zii1 != zii2)
+		zuf_w_lock_nested(zii2);
+}
+
+static void _unlock_two_ziis(struct zuf_inode_info *zii1,
+		      struct zuf_inode_info *zii2)
+{
+	if (zii1 > zii2)
+		swap(zii2, zii2);
+
+	if (zii1 != zii2)
+		zuf_w_unlock(zii2);
+	zuf_w_unlock(zii1);
+}
+
+static int _clone_file_range(struct inode *src_inode, loff_t pos_in,
+			     struct file *file_out,
+			     struct inode *dst_inode, loff_t pos_out,
+			     u64 len, u64 len_up, int operation)
+{
+	struct zuf_inode_info *src_zii = ZUII(src_inode);
+	struct zuf_inode_info *dst_zii = ZUII(dst_inode);
+	struct zus_inode *dst_zi = dst_zii->zi;
+	struct super_block *sb = src_inode->i_sb;
+	struct zufs_ioc_clone ioc_clone = {
+		.hdr.in_len = sizeof(ioc_clone),
+		.hdr.out_len = sizeof(ioc_clone),
+		.hdr.operation = operation,
+		.src_zus_ii = src_zii->zus_ii,
+		.dst_zus_ii = dst_zii->zus_ii,
+		.pos_in = pos_in,
+		.pos_out = pos_out,
+		.len = len,
+		.len_up = len_up,
+	};
+	int err;
+
+	/* NOTE: len==0 means to-end-of-file which is what we want */
+	unmap_mapping_range(src_inode->i_mapping, pos_in,  len, 0);
+	unmap_mapping_range(dst_inode->i_mapping, pos_out, len, 0);
+
+	zufc_goose_all_zts(ZUF_ROOT(SBI(dst_inode->i_sb)), NULL);
+
+	if ((len_up == 0) && (pos_in || pos_out)) {
+		zuf_err("Boaz Smoking 0x%llx 0x%llx 0x%llx\n",
+			pos_in, pos_out, len);
+		/* Bad caller */
+		return -EINVAL;
+	}
+
+	err = zufc_dispatch(ZUF_ROOT(SBI(sb)), &ioc_clone.hdr, NULL, 0);
+	if (unlikely(err && err != -EINTR)) {
+		zuf_dbg_err("failed to clone %ld -> %ld ; err=%d\n",
+			 src_inode->i_ino, dst_inode->i_ino, err);
+		return err;
+	}
+
+	dst_inode->i_blocks = le64_to_cpu(dst_zi->i_blocks);
+	i_size_write(dst_inode, dst_zi->i_size);
+
+	return err;
+}
+
+/* FIXME: Old checks are not needed. I keep them to make sure they
+ * are not complaining. Will remove _zuf_old_checks SOON
+ */
+static int _zuf_old_checks(struct super_block *sb,
+			   struct inode *src_inode, loff_t pos_in,
+			   struct inode *dst_inode, loff_t pos_out, loff_t len)
+{
+	if (src_inode == dst_inode) {
+		if (pos_in == pos_out) {
+			zuf_warn("[%ld] Clone nothing!!\n",
+				    src_inode->i_ino);
+			return 0;
+		}
+		if (pos_in < pos_out) {
+			if (pos_in + len > pos_out) {
+				zuf_warn("[%ld] overlapping pos_in < pos_out?? => EINVAL\n",
+					 src_inode->i_ino);
+				return -EINVAL;
+			}
+		} else {
+			if (pos_out + len > pos_in) {
+				zuf_warn("[%ld] overlapping pos_out < pos_in?? => EINVAL\n",
+					 src_inode->i_ino);
+				return -EINVAL;
+			}
+		}
+	}
+
+	if ((pos_in & (sb->s_blocksize - 1)) ||
+	    (pos_out & (sb->s_blocksize - 1))) {
+		zuf_err("[%ld] Not aligned len=0x%llx pos_in=0x%llx "
+			"pos_out=0x%llx src-size=0x%llx dst-size=0x%llx\n",
+			 src_inode->i_ino, len, pos_in, pos_out,
+			 i_size_read(src_inode), i_size_read(dst_inode));
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static loff_t zuf_clone_file_range(struct file *file_in, loff_t pos_in,
+				struct file *file_out, loff_t pos_out,
+				loff_t len, uint remap_flags)
+{
+	struct inode *src_inode = file_inode(file_in);
+	struct inode *dst_inode = file_inode(file_out);
+	struct zuf_inode_info *src_zii = ZUII(src_inode);
+	struct zuf_inode_info *dst_zii = ZUII(dst_inode);
+	ulong src_size = i_size_read(src_inode);
+	ulong dst_size = i_size_read(dst_inode);
+	struct super_block *sb = src_inode->i_sb;
+	ulong len_up;
+	int err;
+
+	zuf_dbg_vfs("IN: [%ld]{0x%llx} => [%ld]{0x%llx} length=0x%llx flags=0x%x\n",
+		    src_inode->i_ino, pos_in, dst_inode->i_ino, pos_out, len,
+		    remap_flags);
+
+	if (remap_flags & ~(REMAP_FILE_CAN_SHORTEN | REMAP_FILE_DEDUP)) {
+		/* New flags we do not know */
+		zuf_dbg_err("[%ld] Unknown remap_flags(0x%x)\n",
+			    src_inode->i_ino, remap_flags);
+		return -EINVAL;
+	}
+
+	if ((pos_in + len > sb->s_maxbytes) || (pos_out + len > sb->s_maxbytes))
+		return -EINVAL;
+
+	_lock_two_ziis(src_zii, dst_zii);
+
+	err = _remap_file_range_prep(file_in, pos_in, file_out, pos_out, &len,
+				     remap_flags);
+	if (err < 0 || len == 0)
+		goto out;
+	err = _zuf_old_checks(sb, src_inode, pos_in, dst_inode, pos_out, len);
+	if (unlikely(err))
+		goto out;
+
+	err = file_remove_privs(file_out);
+	if (unlikely(err))
+		goto out;
+
+	if (!(remap_flags & REMAP_FILE_DEDUP))
+		zus_inode_cmtime_now(dst_inode, dst_zii->zi);
+
+	/* See about all-file-clone optimization */
+	len_up = len;
+	if (!pos_in && !pos_out && (src_size <= pos_in + len) &&
+	    (dst_size <= src_size)) {
+		len_up = 0;
+	} else if (len & (sb->s_blocksize - 1)) {
+		/* un-aligned len, see if it is beyond EOF */
+		if ((src_size > pos_in  + len) ||
+		    (dst_size > pos_out + len)) {
+			zuf_err("[%ld][%ld] Not aligned len=0x%llx pos_in=0x%llx "
+				"pos_out=0x%llx src-size=0x%lx dst-size=0x%lx\n",
+				src_inode->i_ino, dst_inode->i_ino, len,
+				pos_in, pos_out, src_size, dst_size);
+			err = -EINVAL;
+			goto out;
+		}
+		len_up = md_p2o(md_o2p_up(len));
+	}
+
+	err = _clone_file_range(src_inode, pos_in, file_out, dst_inode, pos_out,
+				len, len_up, ZUFS_OP_CLONE);
+	if (unlikely(err))
+		zuf_dbg_err("_clone_file_range failed => %d\n", err);
+
+out:
+	_unlock_two_ziis(src_zii, dst_zii);
+	return err ? err : len;
+}
+
+static ssize_t zuf_copy_file_range(struct file *file_in, loff_t pos_in,
+				   struct file *file_out, loff_t pos_out,
+				   size_t len, uint flags)
+{
+	struct inode *src_inode = file_inode(file_in);
+	struct inode *dst_inode = file_inode(file_out);
+	ssize_t ret;
+
+	zuf_dbg_vfs("ino-in=%ld ino-out=%ld pos_in=0x%llx pos_out=0x%llx length=0x%lx\n",
+		    src_inode->i_ino, dst_inode->i_ino, pos_in, pos_out, len);
+
+	ret = zuf_clone_file_range(file_in, pos_in, file_out, pos_out, len,
+				   REMAP_FILE_ADVISORY);
+
+	return ret ?: len;
+}
+
+/* ZUFS:
+ * make sure we clean up the resources consumed by zufs_init()
+ */
+static int zuf_file_release(struct inode *inode, struct file *file)
+{
+	if (unlikely(file->private_data))
+		zuf_err("not yet\n");
+
+	/* FIXME: swapon code reads its header through the page cache.
+	 * So we clean it here. Need to submit a patch for reading swap
+	 * header through read_iter or direct_IO
+	 */
+	if (unlikely(file->f_mapping->nrpages)) {
+		zuf_dbg_err("Yes (%ld) swap=%d\n",
+			 file->f_mapping->nrpages, IS_SWAPFILE(inode));
+		truncate_inode_pages_range(file->f_mapping, 0,
+					file->f_mapping->nrpages << PAGE_SHIFT);
+	}
+
+	return 0;
+}
 
 ssize_t zuf_read_iter(struct kiocb *kiocb, struct iov_iter *ii)
 {
@@ -156,16 +790,44 @@ ssize_t zuf_write_iter(struct kiocb *kiocb, struct iov_iter *ii)
 	return ret;
 }
 
+static int zuf_fadvise(struct file *file, loff_t offset, loff_t len,
+		       int advise)
+{
+	struct inode *inode = file_inode(file);
+	struct zuf_inode_info *zii = ZUII(inode);
+	int err;
+
+	if (!S_ISREG(inode->i_mode))
+		return -EINVAL;
+
+	zuf_r_lock(zii);
+
+	err = zuf_rw_fadvise(inode->i_sb, inode, offset, len, advise,
+			     file->f_mode & FMODE_RANDOM);
+
+	zuf_r_unlock(zii);
+
+	return err;
+}
+
 const struct file_operations zuf_file_operations = {
 	.open			= generic_file_open,
 	.read_iter		= zuf_read_iter,
 	.write_iter		= zuf_write_iter,
 	.mmap			= zuf_file_mmap,
 	.fsync			= zuf_fsync,
+	.llseek			= zuf_llseek,
+	.flush			= zuf_flush,
+	.release		= zuf_file_release,
+	.fallocate		= zuf_fallocate,
+	.copy_file_range	= zuf_copy_file_range,
+	.remap_file_range	= zuf_clone_file_range,
+	.fadvise		= zuf_fadvise,
 };
 
 const struct inode_operations zuf_file_inode_operations = {
 	.setattr	= zuf_setattr,
 	.getattr	= zuf_getattr,
 	.update_time	= zuf_update_time,
+	.fiemap		= zuf_fiemap,
 };
diff --git a/fs/zuf/zuf-core.c b/fs/zuf/zuf-core.c
index ff04c6912c17..9f690142f479 100644
--- a/fs/zuf/zuf-core.c
+++ b/fs/zuf/zuf-core.c
@@ -95,6 +95,8 @@ const char *zuf_op_name(enum e_zufs_operation op)
 		CASE_ENUM_NAME(ZUFS_OP_REMOVE_DENTRY);
 		CASE_ENUM_NAME(ZUFS_OP_RENAME);
 		CASE_ENUM_NAME(ZUFS_OP_READDIR);
+		CASE_ENUM_NAME(ZUFS_OP_CLONE);
+		CASE_ENUM_NAME(ZUFS_OP_COPY);
 
 		CASE_ENUM_NAME(ZUFS_OP_READ);
 		CASE_ENUM_NAME(ZUFS_OP_PRE_READ);
@@ -102,6 +104,9 @@ const char *zuf_op_name(enum e_zufs_operation op)
 		CASE_ENUM_NAME(ZUFS_OP_MMAP_CLOSE);
 		CASE_ENUM_NAME(ZUFS_OP_SETATTR);
 		CASE_ENUM_NAME(ZUFS_OP_SYNC);
+		CASE_ENUM_NAME(ZUFS_OP_FALLOCATE);
+		CASE_ENUM_NAME(ZUFS_OP_LLSEEK);
+		CASE_ENUM_NAME(ZUFS_OP_FIEMAP);
 
 		CASE_ENUM_NAME(ZUFS_OP_GET_MULTY);
 		CASE_ENUM_NAME(ZUFS_OP_PUT_MULTY);
diff --git a/fs/zuf/zus_api.h b/fs/zuf/zus_api.h
index 42d3086a4262..1a7b53157192 100644
--- a/fs/zuf/zus_api.h
+++ b/fs/zuf/zus_api.h
@@ -459,6 +459,8 @@ enum e_zufs_operation {
 	ZUFS_OP_REMOVE_DENTRY	= 9,
 	ZUFS_OP_RENAME		= 10,
 	ZUFS_OP_READDIR		= 11,
+	ZUFS_OP_CLONE		= 12,
+	ZUFS_OP_COPY		= 13,
 
 	ZUFS_OP_READ		= 14,
 	ZUFS_OP_PRE_READ	= 15,
@@ -467,6 +469,8 @@ enum e_zufs_operation {
 	ZUFS_OP_SETATTR		= 19,
 	ZUFS_OP_SYNC		= 20,
 	ZUFS_OP_FALLOCATE	= 21,
+	ZUFS_OP_LLSEEK		= 22,
+	ZUFS_OP_FIEMAP		= 28,
 
 	ZUFS_OP_GET_MULTY	= 29,
 	ZUFS_OP_PUT_MULTY	= 30,
@@ -684,6 +688,85 @@ struct zufs_ioc_sync {
 	__u64 write_unmapped;
 };
 
+/* ZUFS_OP_CLONE */
+struct zufs_ioc_clone {
+	struct zufs_ioc_hdr hdr;
+	/* IN */
+	struct zus_inode_info *src_zus_ii;
+	struct zus_inode_info *dst_zus_ii;
+	__u64 pos_in, pos_out;
+	__u64 len;
+	__u64 len_up;
+};
+
+/* ZUFS_OP_LLSEEK */
+struct zufs_ioc_seek {
+	struct zufs_ioc_hdr hdr;
+	/* IN */
+	struct zus_inode_info *zus_ii;
+	__u64 offset_in;
+	__u32 whence;
+	__u32 pad;
+
+	/* OUT */
+	__u64 offset_out;
+};
+
+/* ZUFS_OP_FIEMAP */
+struct zufs_ioc_fiemap {
+	struct zufs_ioc_hdr hdr;
+
+	/* IN */
+	struct zus_inode_info *zus_ii;
+	__u64	start;
+	__u64	length;
+	__u32	flags;
+	__u32	extents_max;
+
+	/* OUT */
+	__u32	extents_mapped;
+	__u32	pad;
+
+} __packed;
+
+struct zufs_fiemap_extent_info {
+	struct fiemap_extent *fi_extents_start;
+	__u32 fi_flags;
+	__u32 fi_extents_mapped;
+	__u32 fi_extents_max;
+	__u32 __pad;
+};
+
+static inline
+int zufs_fiemap_fill_next_extent(struct zufs_fiemap_extent_info *fieinfo,
+				 __u64 logical, __u64 phys,
+				 __u64 len, __u32 flags)
+{
+	struct fiemap_extent *dest = fieinfo->fi_extents_start;
+
+	if (fieinfo->fi_extents_max == 0) {
+		fieinfo->fi_extents_mapped++;
+		return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
+	}
+
+	if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
+		return 1;
+
+	dest += fieinfo->fi_extents_mapped;
+	dest->fe_logical = logical;
+	dest->fe_physical = phys;
+	dest->fe_length = len;
+	dest->fe_flags = flags;
+
+	fieinfo->fi_extents_mapped++;
+	if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
+		return 1;
+
+	return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
+}
+
+
+
 /* ~~~~ io_map structures && IOCTL(s) ~~~~ */
 /*
  * These set of structures and helpers are used in return of zufs_ioc_IO and
