diff options
| -rw-r--r-- | source3/smbd/fileio.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/source3/smbd/fileio.c b/source3/smbd/fileio.c index c6094f902b..b4e8a1d5d4 100644 --- a/source3/smbd/fileio.c +++ b/source3/smbd/fileio.c @@ -401,6 +401,37 @@ nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n", fsp->fh->pos = pos + n; + if ((n == 1) && (data[0] == '\0') && (pos > wcp->file_size)) { + int ret; + + /* + * This is a 1-byte write of a 0 beyond the EOF and + * thus implicitly also beyond the current active + * write cache, the typical file-extending (and + * allocating, but we're using the write cache here) + * write done by Windows. We just have to ftruncate + * the file and rely on posix semantics to return + * zeros for non-written file data that is within the + * file length. + * + * We can not use wcp_file_size_change here because we + * might have an existing write cache, and + * wcp_file_size_change assumes a change to just the + * end of the current write cache. + */ + + wcp->file_size = pos + 1; + ret = SMB_VFS_FTRUNCATE(fsp, wcp->file_size); + if (ret == -1) { + DEBUG(0,("wcp_file_size_change (%s): ftruncate of size %.0f" + "error %s\n", fsp_str_dbg(fsp), + (double)wcp->file_size, strerror(errno))); + return -1; + } + return 1; + } + + /* * If we have active cache and it isn't contiguous then we flush. * NOTE: There is a small problem with running out of disk .... |