Commit 7fe6fe95 authored by Ronnie Sahlberg's avatar Ronnie Sahlberg Committed by Steve French
Browse files

cifs: add FALLOC_FL_INSERT_RANGE support



Emulated via server side copy and setsize for
SMB3 and later. In the future we could compound
this (and/or optionally use DUPLICATE_EXTENTS
if supported by the server).

Signed-off-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 5476b5dd
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+40 −0
Original line number Diff line number Diff line
@@ -3721,6 +3721,44 @@ static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
	return rc;
}

static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
			      loff_t off, loff_t len)
{
	int rc;
	unsigned int xid;
	struct cifsFileInfo *cfile = file->private_data;
	__le64 eof;
	__u64  count;

	xid = get_xid();

	if (off >= i_size_read(file->f_inode)) {
		rc = -EINVAL;
		goto out;
	}

	count = i_size_read(file->f_inode) - off;
	eof = cpu_to_le64(i_size_read(file->f_inode) + len);

	rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
			  cfile->fid.volatile_fid, cfile->pid, &eof);
	if (rc < 0)
		goto out;

	rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len);
	if (rc < 0)
		goto out;

	rc = smb3_zero_range(file, tcon, off, len, 1);
	if (rc < 0)
		goto out;

	rc = 0;
 out:
	free_xid(xid);
	return rc;
}

static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
{
	struct cifsFileInfo *wrcfile, *cfile = file->private_data;
@@ -3894,6 +3932,8 @@ static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
		return smb3_simple_falloc(file, tcon, off, len, true);
	else if (mode == FALLOC_FL_COLLAPSE_RANGE)
		return smb3_collapse_range(file, tcon, off, len);
	else if (mode == FALLOC_FL_INSERT_RANGE)
		return smb3_insert_range(file, tcon, off, len);
	else if (mode == 0)
		return smb3_simple_falloc(file, tcon, off, len, false);