cifs: add FALLOC_FL_INSERT_RANGE support

Commit Message

Ronnie Sahlberg March 26, 2021, 8:31 p.m. UTC

Signed-off-by: Ronnie Sahlberg <[e-mail]>
---
 fs/cifs/smb2ops.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

Patch

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 3bb18944aaa4..e51aee5ce664 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3678,6 +3678,48 @@  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, count;
+
+	xid = get_xid();
+
+	if (off + len < off) {
+		rc = -EFBIG;
+		goto out;
+	}
+
+	if (off >= i_size_read(file->f_inode)) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	count = i_size_read(file->f_inode) - off;
+	eof = 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;
@@ -3851,6 +3893,8 @@  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);