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hw/9pfs: Fix build error on platform that don't support futimens 

Also don't do glibc version check to find handle support. Instead
do handle syscall support in configure.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
master
Aneesh Kumar K.V 2011-10-12 19:11:24 +05:30
parent 7c92a3d2a1
commit d20423788e
2 changed files with 40 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
configure vendored
View File

@ -2556,6 +2556,18 @@ EOF
fi fi
fi fi
##########################################
# check if we have open_by_handle_at
open_by_hande_at=no
cat > $TMPC << EOF
#include <fcntl.h>
int main(void) { struct file_handle *fh; open_by_handle_at(0, fh, 0); }
EOF
if compile_prog "" "" ; then
open_by_handle_at=yes
fi
########################################## ##########################################
# End of CC checks # End of CC checks
# After here, no more $cc or $ld runs # After here, no more $cc or $ld runs
@ -3035,6 +3047,10 @@ if test "$ucontext_coroutine" = "yes" ; then
echo "CONFIG_UCONTEXT_COROUTINE=y" >> $config_host_mak echo "CONFIG_UCONTEXT_COROUTINE=y" >> $config_host_mak
fi fi
if test "$open_by_handle_at" = "yes" ; then
echo "CONFIG_OPEN_BY_HANDLE=y" >> $config_host_mak
fi
# USB host support # USB host support
case "$usb" in case "$usb" in
linux) linux)

52
hw/9pfs/virtio-9p-handle.c
View File

@ -27,13 +27,24 @@ struct handle_data {
int handle_bytes; int handle_bytes;
}; };
#if __GLIBC__ <= 2 && __GLIBC_MINOR__ < 14 #ifdef CONFIG_OPEN_BY_HANDLE
static inline int name_to_handle(int dirfd, const char *name,
struct file_handle *fh, int *mnt_id, int flags)
{
return name_to_handle_at(dirfd, name, fh, mnt_id, flags);
}
static inline int open_by_handle(int mountfd, const char *fh, int flags)
{
return open_by_handle_at(mountfd, (struct file_handle *)fh, flags);
}
#else
struct file_handle { struct file_handle {
unsigned int handle_bytes; unsigned int handle_bytes;
int handle_type; int handle_type;
unsigned char handle[0]; unsigned char handle[0];
}; };
#endif
#ifndef AT_EMPTY_PATH #ifndef AT_EMPTY_PATH
#define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname */ #define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname */
@ -42,28 +53,6 @@ struct file_handle {
#define O_PATH 010000000 #define O_PATH 010000000
#endif #endif
#ifndef __NR_name_to_handle_at
#if defined(__i386__)
#define __NR_name_to_handle_at 341
#define __NR_open_by_handle_at 342
#elif defined(__x86_64__)
#define __NR_name_to_handle_at 303
#define __NR_open_by_handle_at 304
#endif
#endif
#ifdef __NR_name_to_handle_at
static inline int name_to_handle(int dirfd, const char *name,
struct file_handle *fh, int *mnt_id, int flags)
{
return syscall(__NR_name_to_handle_at, dirfd, name, fh, mnt_id, flags);
}
static inline int open_by_handle(int mountfd, const char *fh, int flags)
{
return syscall(__NR_open_by_handle_at, mountfd, fh, flags);
}
#else
static inline int name_to_handle(int dirfd, const char *name, static inline int name_to_handle(int dirfd, const char *name,
struct file_handle *fh, int *mnt_id, int flags) struct file_handle *fh, int *mnt_id, int flags)
{ {
@ -380,7 +369,9 @@ static int handle_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path, static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path,
const struct timespec *buf) const struct timespec *buf)
{ {
int fd, ret; int ret;
#ifdef CONFIG_UTIMENSAT
int fd;
struct handle_data *data = (struct handle_data *)ctx->private; struct handle_data *data = (struct handle_data *)ctx->private;
fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK); fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
@ -389,6 +380,10 @@ static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path,
} }
ret = futimens(fd, buf); ret = futimens(fd, buf);
close(fd); close(fd);
#else
ret = -1;
errno = ENOSYS;
#endif
return ret; return ret;
} }
@ -564,6 +559,7 @@ static int handle_init(FsContext *ctx)
int ret, mnt_id; int ret, mnt_id;
struct file_handle fh; struct file_handle fh;
struct handle_data *data = g_malloc(sizeof(struct handle_data)); struct handle_data *data = g_malloc(sizeof(struct handle_data));
data->mountfd = open(ctx->fs_root, O_DIRECTORY); data->mountfd = open(ctx->fs_root, O_DIRECTORY);
if (data->mountfd < 0) { if (data->mountfd < 0) {
ret = data->mountfd; ret = data->mountfd;