1 files changed, 45 insertions, 0 deletions

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 3fcd410cee31..101670c2c374 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1015,6 +1015,50 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
         return rc;
 }
 
+static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
+                            loff_t offset, loff_t len)
+{
+        struct inode *inode;
+        struct cifsInodeInfo *cifsi;
+        struct cifsFileInfo *cfile = file->private_data;
+        struct file_zero_data_information fsctl_buf;
+        long rc;
+        unsigned int xid;
+        __u8 set_sparse = 1;
+
+        xid = get_xid();
+
+        inode = cfile->dentry->d_inode;
+        cifsi = CIFS_I(inode);
+
+        /* Need to make file sparse, if not already, before freeing range. */
+        /* Consider adding equivalent for compressed since it could also work */
+        if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse))
+                return -EOPNOTSUPP;
+
+        cifs_dbg(FYI, "offset %lld len %lld", offset, len);
+
+        fsctl_buf.FileOffset = cpu_to_le64(offset);
+        fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
+
+        rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
+                        cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
+                        true /* is_fctl */, (char *)&fsctl_buf,
+                        sizeof(struct file_zero_data_information), NULL, NULL);
+        free_xid(xid);
+        return rc;
+}
+
+static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
+                           loff_t off, loff_t len)
+{
+        /* KEEP_SIZE already checked for by do_fallocate */
+        if (mode & FALLOC_FL_PUNCH_HOLE)
+                return smb3_punch_hole(file, tcon, off, len);
+
+        return -EOPNOTSUPP;
+}
+
 static void
 smb2_downgrade_oplock(struct TCP_Server_Info *server,
                         struct cifsInodeInfo *cinode, bool set_level2)
@@ -1463,6 +1507,7 @@ struct smb_version_operations smb30_operations = {
         .validate_negotiate = smb3_validate_negotiate,
         .wp_retry_size = smb2_wp_retry_size,
         .dir_needs_close = smb2_dir_needs_close,
+        .fallocate = smb3_fallocate,
 };
 
 struct smb_version_values smb20_values = {