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linux-user: Add support for syncfs() syscall

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This patch implements Qemu user mode syncfs() syscall support. Syscall
syncfs() syncs the filesystem containing file determined by the open
file descriptor passed as the argument to syncfs().

The implementation consists of a straightforward invocation of host's
syncfs(). Configure and strace support is included as well.

Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Aleksandar Markovic 2016-10-10 13:23:30 +02:00 committed by Riku Voipio
parent 38860a0343
commit 5a03cd009a
3 changed files with 24 additions and 1 deletions
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18
configure vendored
View File

@ -3926,6 +3926,21 @@ if compile_prog "" "" ; then
clock_adjtime=yes
fi
# syncfs probe
syncfs=no
cat > $TMPC <<EOF
#include <unistd.h>
int main(void)
{
return syncfs(0);
}
EOF
syncfs=no
if compile_prog "" "" ; then
syncfs=yes
fi
# Check if tools are available to build documentation.
if test "$docs" != "no" ; then
if has makeinfo && has pod2man; then
@ -5214,6 +5229,9 @@ fi
if test "$clock_adjtime" = "yes" ; then
echo "CONFIG_CLOCK_ADJTIME=y" >> $config_host_mak
fi
if test "$syncfs" = "yes" ; then
echo "CONFIG_SYNCFS=y" >> $config_host_mak
fi
if test "$inotify" = "yes" ; then
echo "CONFIG_INOTIFY=y" >> $config_host_mak
fi

2
linux-user/strace.list
View File

@ -1459,7 +1459,7 @@
{ TARGET_NR_sync, "sync" , NULL, NULL, NULL },
#endif
#ifdef TARGET_NR_syncfs
{ TARGET_NR_syncfs, "syncfs" , NULL, NULL, NULL },
{ TARGET_NR_syncfs, "syncfs" , "%s(%d)", NULL, NULL },
#endif
#ifdef TARGET_NR_syscall
{ TARGET_NR_syscall, "syscall" , NULL, NULL, NULL },

5
linux-user/syscall.c
View File

@ -8090,6 +8090,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
sync();
ret = 0;
break;
#if defined(TARGET_NR_syncfs) && defined(CONFIG_SYNCFS)
case TARGET_NR_syncfs:
ret = get_errno(syncfs(arg1));
break;
#endif
case TARGET_NR_kill:
ret = get_errno(safe_kill(arg1, target_to_host_signal(arg2)));
break;