[Virtio-fs] [PATCH] virtiofsd: Let meson check for statx.stx_mnt_id
Hanna Reitz
hreitz at redhat.com
Wed Feb 23 09:23:40 UTC 2022
In virtiofsd, we assume that the presence of the STATX_MNT_ID macro
implies existence of the statx.stx_mnt_id field. Unfortunately, that is
not necessarily the case: glibc has introduced the macro in its commit
88a2cf6c4bab6e94a65e9c0db8813709372e9180, but the statx.stx_mnt_id field
is still missing from its own headers.
Let meson.build actually chek for both STATX_MNT_ID and
statx.stx_mnt_id, and set CONFIG_STATX_MNT_ID if both are present.
Then, use this config macro in virtiofsd.
Closes: https://gitlab.com/qemu-project/qemu/-/issues/882
Signed-off-by: Hanna Reitz <hreitz at redhat.com>
---
meson.build | 13 +++++++++++++
tools/virtiofsd/passthrough_ll.c | 2 +-
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/meson.build b/meson.build
index 8df40bfac4..a5b63e62cd 100644
--- a/meson.build
+++ b/meson.build
@@ -1306,6 +1306,18 @@ statx_test = gnu_source_prefix + '''
has_statx = cc.links(statx_test)
+# Check whether statx() provides mount ID information
+
+statx_mnt_id_test = gnu_source_prefix + '''
+ #include <sys/stat.h>
+ int main(void) {
+ struct statx statxbuf;
+ statx(0, "", 0, STATX_BASIC_STATS | STATX_MNT_ID, &statxbuf);
+ return statxbuf.stx_mnt_id;
+ }'''
+
+has_statx_mnt_id = cc.links(statx_mnt_id_test)
+
have_vhost_user_blk_server = get_option('vhost_user_blk_server') \
.require(targetos == 'linux',
error_message: 'vhost_user_blk_server requires linux') \
@@ -1553,6 +1565,7 @@ config_host_data.set('CONFIG_NETTLE', nettle.found())
config_host_data.set('CONFIG_QEMU_PRIVATE_XTS', xts == 'private')
config_host_data.set('CONFIG_MALLOC_TRIM', has_malloc_trim)
config_host_data.set('CONFIG_STATX', has_statx)
+config_host_data.set('CONFIG_STATX_MNT_ID', has_statx_mnt_id)
config_host_data.set('CONFIG_ZSTD', zstd.found())
config_host_data.set('CONFIG_FUSE', fuse.found())
config_host_data.set('CONFIG_FUSE_LSEEK', fuse_lseek.found())
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index dfa2fc250d..028dacdd8f 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -1039,7 +1039,7 @@ static int do_statx(struct lo_data *lo, int dirfd, const char *pathname,
{
int res;
-#if defined(CONFIG_STATX) && defined(STATX_MNT_ID)
+#if defined(CONFIG_STATX) && defined(CONFIG_STATX_MNT_ID)
if (lo->use_statx) {
struct statx statxbuf;
--
2.34.1
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