cifs: change SMB2_OP_SET_EOF to use compounding

This changes SMB2_OP_SET_EOF to use compounding in some situations.
This is part of the path based API to truncate a file.
Most of the time this will however not be invoked for SMB2 since
cifs_set_file_size() will as far as I can tell almost always just
open the file synchronously and switch to the handle based truncate
code path, thus bypassing the compounding we add here.

Rewriting cifs_set_file_size() and make that whole pile of code more
compounding friendly, and also easier to read and understand, is a
different project though and not for this patch.

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

diff --git a/fs/cifs/smb2inode.c b/fs/cifs/smb2inode.c
index 25f057c587ea63473388e69f1b4d7217b473a049..e9794a2adaac7a80f196f7e632ce79dee8449b4a 100644 (file)
--- a/fs/cifs/smb2inode.c
+++ b/fs/cifs/smb2inode.c
@@ -132,6 +132,21 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                smb2_set_next_command(server, &rqst[num_rqst]);
                smb2_set_related(&rqst[num_rqst++]);
                break;
+       case SMB2_OP_SET_EOF:
+               memset(&si_iov, 0, sizeof(si_iov));
+               rqst[num_rqst].rq_iov = si_iov;
+               rqst[num_rqst].rq_nvec = 1;
+
+               size[0] = 8; /* sizeof __le64 */
+               data[0] = ptr;
+
+               rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
+                                       COMPOUND_FID, current->tgid,
+                                       FILE_END_OF_FILE_INFORMATION,
+                                       SMB2_O_INFO_FILE, 0, data, size);
+               smb2_set_next_command(server, &rqst[num_rqst]);
+               smb2_set_related(&rqst[num_rqst++]);
+               break;
        default:
                cifs_dbg(VFS, "Invalid command\n");
                rc = -EINVAL;
@@ -175,6 +190,7 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
                if (rqst[1].rq_iov)
                        SMB2_close_free(&rqst[1]);
                break;
+       case SMB2_OP_SET_EOF:
        case SMB2_OP_RMDIR:
                if (rqst[1].rq_iov)
                        SMB2_set_info_free(&rqst[1]);
@@ -239,11 +255,6 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
                tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
                                          fid.volatile_fid, (__le16 *)data);
                break;
-       case SMB2_OP_SET_EOF:
-               tmprc = SMB2_set_eof(xid, tcon, fid.persistent_fid,
-                                    fid.volatile_fid, current->tgid,
-                                    (__le64 *)data, false);
-               break;
        case SMB2_OP_SET_INFO:
                tmprc = SMB2_set_basic_info(xid, tcon, fid.persistent_fid,
                                            fid.volatile_fid,
@@ -403,9 +414,10 @@ smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
                   struct cifs_sb_info *cifs_sb, bool set_alloc)
 {
        __le64 eof = cpu_to_le64(size);
-       return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
-                                 FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
-                                 SMB2_OP_SET_EOF);
+
+       return smb2_compound_op(xid, tcon, cifs_sb, full_path,
+                               FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
+                               SMB2_OP_SET_EOF);
 }
 
 int