diff options
Diffstat (limited to 'fs/cifs/smb2ops.c')
| -rw-r--r-- | fs/cifs/smb2ops.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 32dde87feaa9..9a7164c2ea63 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3767,6 +3767,104 @@ smb2_next_header(char *buf) return le32_to_cpu(hdr->NextCommand); } +static int +smb2_make_node(unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + char *full_path, umode_t mode, dev_t dev) +{ + struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); + int rc = -EPERM; + int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL; + FILE_ALL_INFO *buf = NULL; + struct cifs_io_parms io_parms; + __u32 oplock = 0; + struct cifs_fid fid; + struct cifs_open_parms oparms; + unsigned int bytes_written; + struct win_dev *pdev; + struct kvec iov[2]; + + /* + * Check if mounted with mount parm 'sfu' mount parm. + * SFU emulation should work with all servers, but only + * supports block and char device (no socket & fifo), + * and was used by default in earlier versions of Windows + */ + if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) + goto out; + + /* + * TODO: Add ability to create instead via reparse point. Windows (e.g. + * their current NFS server) uses this approach to expose special files + * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions + */ + + if (!S_ISCHR(mode) && !S_ISBLK(mode)) + goto out; + + cifs_dbg(FYI, "sfu compat create special file\n"); + + buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); + if (buf == NULL) { + rc = -ENOMEM; + goto out; + } + + if (backup_cred(cifs_sb)) + create_options |= CREATE_OPEN_BACKUP_INTENT; + + oparms.tcon = tcon; + oparms.cifs_sb = cifs_sb; + oparms.desired_access = GENERIC_WRITE; + oparms.create_options = create_options; + oparms.disposition = FILE_CREATE; + oparms.path = full_path; + oparms.fid = &fid; + oparms.reconnect = false; + + if (tcon->ses->server->oplocks) + oplock = REQ_OPLOCK; + else + oplock = 0; + rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf); + if (rc) + goto out; + + /* + * BB Do not bother to decode buf since no local inode yet to put + * timestamps in, but we can reuse it safely. + */ + + pdev = (struct win_dev *)buf; + io_parms.pid = current->tgid; + io_parms.tcon = tcon; + io_parms.offset = 0; + io_parms.length = sizeof(struct win_dev); + iov[1].iov_base = buf; + iov[1].iov_len = sizeof(struct win_dev); + if (S_ISCHR(mode)) { + memcpy(pdev->type, "IntxCHR", 8); + pdev->major = cpu_to_le64(MAJOR(dev)); + pdev->minor = cpu_to_le64(MINOR(dev)); + rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, + &bytes_written, iov, 1); + } else if (S_ISBLK(mode)) { + memcpy(pdev->type, "IntxBLK", 8); + pdev->major = cpu_to_le64(MAJOR(dev)); + pdev->minor = cpu_to_le64(MINOR(dev)); + rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, + &bytes_written, iov, 1); + } + tcon->ses->server->ops->close(xid, tcon, &fid); + d_drop(dentry); + + /* FIXME: add code here to set EAs */ +out: + kfree(buf); + return rc; +} + + struct smb_version_operations smb20_operations = { .compare_fids = smb2_compare_fids, .setup_request = smb2_setup_request, @@ -3861,6 +3959,7 @@ struct smb_version_operations smb20_operations = { #endif /* CIFS_ACL */ .next_header = smb2_next_header, .ioctl_query_info = smb2_ioctl_query_info, + .make_node = smb2_make_node, }; struct smb_version_operations smb21_operations = { @@ -3959,6 +4058,7 @@ struct smb_version_operations smb21_operations = { #endif /* CIFS_ACL */ .next_header = smb2_next_header, .ioctl_query_info = smb2_ioctl_query_info, + .make_node = smb2_make_node, }; struct smb_version_operations smb30_operations = { @@ -4066,6 +4166,7 @@ struct smb_version_operations smb30_operations = { #endif /* CIFS_ACL */ .next_header = smb2_next_header, .ioctl_query_info = smb2_ioctl_query_info, + .make_node = smb2_make_node, }; struct smb_version_operations smb311_operations = { @@ -4174,6 +4275,7 @@ struct smb_version_operations smb311_operations = { #endif /* CIFS_ACL */ .next_header = smb2_next_header, .ioctl_query_info = smb2_ioctl_query_info, + .make_node = smb2_make_node, }; struct smb_version_values smb20_values = { |