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: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 88a787d..5635511 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -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);