Commit 5476b5dd authored by Ronnie Sahlberg's avatar Ronnie Sahlberg Committed by Steve French
Browse files

cifs: add support for FALLOC_FL_COLLAPSE_RANGE 



Emulated for SMB3 and later via server side copy
and setsize. Eventually this could be compounded.

Reported-by: default avatarkernel test robot <lkp@intel.com>
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent f6d2353a

fs/cifs/smb2ops.c

+35 −0
Original line number Diff line number Diff line
@@ -3688,6 +3688,39 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon, 
	return rc;

}



static long smb3_collapse_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;



	xid = get_xid();



	if (off >= i_size_read(file->f_inode) ||

	    off + len >= i_size_read(file->f_inode)) {

		rc = -EINVAL;

		goto out;

	}



	rc = smb2_copychunk_range(xid, cfile, cfile, off + len,

				  i_size_read(file->f_inode) - off - len, off);

	if (rc < 0)

		goto out;



	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 = 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;
@@ -3859,6 +3892,8 @@ static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode, 
		return smb3_zero_range(file, tcon, off, len, false);

	} else if (mode == FALLOC_FL_KEEP_SIZE)

		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 == 0)

		return smb3_simple_falloc(file, tcon, off, len, false);