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* fhandler.cc (fhandler_base::open_9x): Handle O_SYNC and O_DIRECT

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flags.
	(fhandler_base::open): Ditto.
	* fhandler_floppy.cc (fhandler_dev_floppy::open): Don't allocate devbuf
	in O_DIRECT case.
	* fhandler_raw.cc (fhandler_dev_raw::ioctl): Don't allow buffer
	changes in O_DIRECT case.  Allow returning a buffer size 0, which
	indicates O_DIRECT.
	* fhandler_tape.cc (fhandler_dev_tape::open): Use O_SYNC flag to
	hand down the !buffer_writes case.  Don't allocate devbuf in O_DIRECT
	case.
	(fhandler_dev_tape::raw_read): Don't mess with devbuf if it's NULL.
	* include/fcntl.h: Define _FDIRECT, O_DIRECT, O_DSYNC and O_RSYNC.
	* include/cygwin/version.h: Bump API minor version.
This commit is contained in:
Corinna Vinschen
2005-12-14 15:54:33 +00:00
parent 10cba930d4
commit e3d14af155
7 changed files with 127 additions and 78 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,20 @@
2005-12-14 Corinna Vinschen <corinna@vinschen.de>
* fhandler.cc (fhandler_base::open_9x): Handle O_SYNC and O_DIRECT
flags.
(fhandler_base::open): Ditto.
* fhandler_floppy.cc (fhandler_dev_floppy::open): Don't allocate devbuf
in O_DIRECT case.
* fhandler_raw.cc (fhandler_dev_raw::ioctl): Don't allow buffer
changes in O_DIRECT case. Allow returning a buffer size 0, which
indicates O_DIRECT.
* fhandler_tape.cc (fhandler_dev_tape::open): Use O_SYNC flag to
hand down the !buffer_writes case. Don't allocate devbuf in O_DIRECT
case.
(fhandler_dev_tape::raw_read): Don't mess with devbuf if it's NULL.
* include/fcntl.h: Define _FDIRECT, O_DIRECT, O_DSYNC and O_RSYNC.
* include/cygwin/version.h: Bump API minor version.
2005-12-13 Christopher Faylor <cgf@timesys.com>
* cygtls.cc (_cygtls::remove): Don't bother if we're exiting.

14
winsup/cygwin/fhandler.cc
View File

@@ -492,6 +492,10 @@ fhandler_base::open_9x (int flags, mode_t mode)
file_attributes = FILE_ATTRIBUTE_NORMAL;
if (flags & O_DIROPEN)
file_attributes |= FILE_FLAG_BACKUP_SEMANTICS;
if (flags & O_SYNC)
file_attributes |= FILE_FLAG_WRITE_THROUGH;
if (flags & O_DIRECT)
file_attributes |= FILE_FLAG_NO_BUFFERING;
if (get_major () == DEV_SERIAL_MAJOR)
file_attributes |= FILE_FLAG_OVERLAPPED;
@@ -599,18 +603,16 @@ fhandler_base::open (int flags, mode_t mode)
break;
default:
create_options = 0;
if (get_major () == DEV_TAPE_MAJOR && (flags & O_TEXT))
{
/* O_TEXT is used to indicate write-through on tape devices */
create_options |= FILE_WRITE_THROUGH;
flags &= ~O_TEXT;
}
if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
access = GENERIC_READ;
else if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_WRONLY)
access = GENERIC_WRITE | FILE_READ_ATTRIBUTES;
else
access = GENERIC_READ | GENERIC_WRITE;
if (flags & O_SYNC)
create_options |= FILE_WRITE_THROUGH;
if (flags & O_DIRECT)
create_options |= FILE_NO_INTERMEDIATE_BUFFERING;
if (get_major () != DEV_SERIAL_MAJOR && get_major () != DEV_TAPE_MAJOR)
{
create_options |= FILE_SYNCHRONOUS_IO_NONALERT;

7
winsup/cygwin/fhandler_floppy.cc
View File

@@ -161,9 +161,10 @@ fhandler_dev_floppy::open (int flags, mode_t)
relatively big value increases performance by means. The new ioctl call
with 'rdevio.h' header file supports changing this value.
Let's try to be smart: Let's take a multiple of typical tar and cpio
buffer sizes by default. */
devbufsiz = 61440L;
As default buffer size, we're using some value which is a multiple of
the typical tar and cpio buffer sizes, Except O_DIRECT is set, in which
case we're not buffering at all. */
devbufsiz = (flags & O_DIRECT) ? 0L : 61440L;
int ret = fhandler_dev_raw::open (flags);
if (ret && get_drive_info (NULL))

8
winsup/cygwin/fhandler_raw.cc
View File

@@ -159,12 +159,14 @@ fhandler_dev_raw::ioctl (unsigned int cmd, void *buf)
}
else if ((devbuf && ((op->rd_parm <= 1 && (devbufend - devbufstart))
|| op->rd_parm < devbufend - devbufstart))
|| (op->rd_parm > 1 && (op->rd_parm % 512)))
|| (op->rd_parm > 1 && (op->rd_parm % 512))
|| (get_flags () & O_DIRECT))
/* The conditions for a *valid* parameter are these:
- If there's still data in the current buffer, it must
fit in the new buffer.
- The new size is either 0 or 1, both indicating unbufferd
I/O, or the new buffersize must be a multiple of 512. */
I/O, or the new buffersize must be a multiple of 512.
- In the O_DIRECT case, the whole request is invalid. */
ret = ERROR_INVALID_PARAMETER;
else if (!devbuf || op->rd_parm != devbufsiz)
{
@@ -198,7 +200,7 @@ fhandler_dev_raw::ioctl (unsigned int cmd, void *buf)
if (!get)
ret = ERROR_INVALID_PARAMETER;
else
get->bufsiz = devbufsiz ?: 1L;
get->bufsiz = devbufsiz;
}
else
return fhandler_base::ioctl (cmd, buf);

27
winsup/cygwin/fhandler_tape.cc
View File

@@ -1216,11 +1216,16 @@ fhandler_dev_tape::open (int flags, mode_t)
__seterrno ();
return 0;
}
/* The O_TEXT flag is used to indicate write-through (non buffered writes)
to the underlying fhandler_dev_raw::open call. */
flags &= ~O_TEXT;
/* The O_SYNC flag is not supported by the tape driver. Use the
MT_ST_BUFFER_WRITES and MT_ST_ASYNC_WRITES flags in the drive
settings instead. In turn, the MT_ST_BUFFER_WRITES is translated
into O_SYNC, which controls the FILE_WRITE_THROUGH flag in the
NtCreateFile call in fhandler_base::open. */
flags &= ~O_SYNC;
if (!mt->drive (driveno ())->buffer_writes ())
flags |= O_TEXT;
flags |= O_SYNC;
ret = fhandler_dev_raw::open (flags);
if (ret)
{
@@ -1231,8 +1236,11 @@ fhandler_dev_tape::open (int flags, mode_t)
mt->drive (driveno ())->set_pos (get_handle (),
TAPE_SPACE_FILEMARKS, 1, true);
if (!(flags & O_DIRECT))
{
devbufsiz = mt->drive (driveno ())->dp ()->MaximumBlockSize;
devbuf = new char [devbufsiz];
}
devbufstart = devbufend = 0;
}
else
@@ -1283,6 +1291,8 @@ fhandler_dev_tape::raw_read (void *ptr, size_t &ulen)
return;
}
block_size = mt->drive (driveno ())->mp ()->BlockSize;
if (devbuf)
{
if (devbufend > devbufstart)
{
bytes_to_read = min (len, devbufend - devbufstart);
@@ -1347,6 +1357,15 @@ fhandler_dev_tape::raw_read (void *ptr, size_t &ulen)
lastblk_to_read (true);
}
}
}
else
{
if (!mt_evt && !(mt_evt = CreateEvent (&sec_none, TRUE, FALSE, NULL)))
debug_printf ("Creating event failed, %E");
bytes_read = ulen;
ret = mt->drive (driveno ())->read (get_handle (), mt_evt, ptr,
bytes_read);
}
ulen = (ret ? (size_t) -1 : bytes_read);
unlock ();
}

3
winsup/cygwin/include/cygwin/version.h
View File

@@ -282,12 +282,13 @@ details. */
for this?
147: Eliminate problematic d_ino from dirent structure. unsetenv now returns
int, as per linux.
148: Add open(2) flags O_SYNC, O_RSYNC, O_DSYNC and O_DIRECT.
*/
/* Note that we forgot to bump the api for ualarm, strtoll, strtoull */
#define CYGWIN_VERSION_API_MAJOR 0
#define CYGWIN_VERSION_API_MINOR 147
#define CYGWIN_VERSION_API_MINOR 148
/* There is also a compatibity version number associated with the
shared memory regions. It is incremented when incompatible

9
winsup/cygwin/include/fcntl.h
View File

@@ -1,6 +1,6 @@
/* fcntl.h
Copyright 1996, 1998, 2001 Red Hat, Inc.
Copyright 1996, 1998, 2001, 2005 Red Hat, Inc.
This file is part of Cygwin.
@@ -14,4 +14,11 @@ details. */
#include <sys/fcntl.h>
#define O_NDELAY _FNDELAY
/* sys/fcntl defines values up to 0x40000 (O_NOINHERIT). */
#define _FDIRECT 0x80000
#define O_DIRECT _FDIRECT
#define O_DSYNC _FSYNC
#define O_RSYNC _FSYNC
#endif /* _FCNTL_H */