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

fs/cifs/smb2ops.c

+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);