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9p: move P9_XATTR_SIZE_MAX from 9p.h to 9p.c 

The patch set adding 9p functionality to darwin introduced an issue
where limits.h, which defines XATTR_SIZE_MAX, is included in 9p.c,
though the referenced constant is needed in 9p.h. This commit fixes that
issue by moving the definition of P9_XATTR_SIZE_MAX, which uses
XATTR_SIZE_MAX, to also be in 9p.c.

Additionally, this commit moves the location of the system headers
include in 9p.c to occur before the project headers (except osdep.h).

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/950
Fixes: 38d7fd68b0 ("9p: darwin: Move XATTR_SIZE_MAX->P9_XATTR_SIZE_MAX")
Signed-off-by: Will Cohen <wwcohen@gmail.com>
Message-Id: <20220331182651.887-1-wwcohen@gmail.com>
[thuth: Adjusted placement of osdep.h]
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Will Cohen 2022-03-31 14:26:51 -04:00 committed by Thomas Huth
parent 54c9b19421
commit a136d17590
2 changed files with 23 additions and 23 deletions
hw/9pfs
9p.c9p.h

28
hw/9pfs/9p.c
View File

@ -17,6 +17,11 @@
*/
#include "qemu/osdep.h"
#ifdef CONFIG_LINUX
#include <linux/limits.h>
#else
#include <limits.h>
#endif
#include <glib/gprintf.h>
#include "hw/virtio/virtio.h"
#include "qapi/error.h"
@ -33,11 +38,6 @@
#include "migration/blocker.h"
#include "qemu/xxhash.h"
#include <math.h>
#ifdef CONFIG_LINUX
#include <linux/limits.h>
#else
#include <limits.h>
#endif
int open_fd_hw;
int total_open_fd;
@ -3925,6 +3925,24 @@ out_nofid:
v9fs_string_free(&name);
}
#if defined(CONFIG_LINUX)
/* Currently, only Linux has XATTR_SIZE_MAX */
#define P9_XATTR_SIZE_MAX XATTR_SIZE_MAX
#elif defined(CONFIG_DARWIN)
/*
* Darwin doesn't seem to define a maximum xattr size in its user
* space header, so manually configure it across platforms as 64k.
*
* Having no limit at all can lead to QEMU crashing during large g_malloc()
* calls. Because QEMU does not currently support macOS guests, the below
* preliminary solution only works due to its being a reflection of the limit of
* Linux guests.
*/
#define P9_XATTR_SIZE_MAX 65536
#else
#error Missing definition for P9_XATTR_SIZE_MAX for this host system
#endif
static void coroutine_fn v9fs_xattrcreate(void *opaque)
{
int flags, rflags = 0;

18
hw/9pfs/9p.h
View File

@ -479,22 +479,4 @@ struct V9fsTransport {
void (*push_and_notify)(V9fsPDU *pdu);
};
#if defined(XATTR_SIZE_MAX)
/* Linux */
#define P9_XATTR_SIZE_MAX XATTR_SIZE_MAX
#elif defined(CONFIG_DARWIN)
/*
* Darwin doesn't seem to define a maximum xattr size in its user
* space header, so manually configure it across platforms as 64k.
*
* Having no limit at all can lead to QEMU crashing during large g_malloc()
* calls. Because QEMU does not currently support macOS guests, the below
* preliminary solution only works due to its being a reflection of the limit of
* Linux guests.
*/
#define P9_XATTR_SIZE_MAX 65536
#else
#error Missing definition for P9_XATTR_SIZE_MAX for this host system
#endif
#endif