block/file-posix: Simplify the XFS_IOC_DIOINFO handling

The handling for the XFS_IOC_DIOINFO ioctl is currently quite excessive:
This is not a "real" feature like the other features that we provide with
the "--enable-xxx" and "--disable-xxx" switches for the configure script,
since this does not influence lots of code (it's only about one call to
xfsctl() in file-posix.c), so people don't gain much with the ability to
disable this with "--disable-xfsctl".
It's also unfortunate that the ioctl will be disabled on Linux in case
the user did not install the right xfsprogs-devel package before running
configure. Thus let's simplify this by providing the ioctl definition
on our own, so we can completely get rid of the header dependency and
thus the related code in the configure script.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20211215125824.250091-1-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/block/file-posix.c b/block/file-posix.c
index b283093e5b7b4a0643dc82e3f5cea896476a2b16..1f1756e192a5a53383f743ef9a3d51d48095e9db 100644 (file)
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -106,10 +106,6 @@
 #include <sys/diskslice.h>
 #endif
 
-#ifdef CONFIG_XFS
-#include <xfs/xfs.h>
-#endif
-
 /* OS X does not have O_DSYNC */
 #ifndef O_DSYNC
 #ifdef O_SYNC
@@ -156,9 +152,6 @@ typedef struct BDRVRawState {
     int perm_change_flags;
     BDRVReopenState *reopen_state;
 
-#ifdef CONFIG_XFS
-    bool is_xfs:1;
-#endif
     bool has_discard:1;
     bool has_write_zeroes:1;
     bool discard_zeroes:1;
@@ -409,14 +402,22 @@ static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
     if (probe_logical_blocksize(fd, &bs->bl.request_alignment) < 0) {
         bs->bl.request_alignment = 0;
     }
-#ifdef CONFIG_XFS
-    if (s->is_xfs) {
-        struct dioattr da;
-        if (xfsctl(NULL, fd, XFS_IOC_DIOINFO, &da) >= 0) {
-            bs->bl.request_alignment = da.d_miniosz;
-            /* The kernel returns wrong information for d_mem */
-            /* s->buf_align = da.d_mem; */
-        }
+
+#ifdef __linux__
+    /*
+     * The XFS ioctl definitions are shipped in extra packages that might
+     * not always be available. Since we just need the XFS_IOC_DIOINFO ioctl
+     * here, we simply use our own definition instead:
+     */
+    struct xfs_dioattr {
+        uint32_t d_mem;
+        uint32_t d_miniosz;
+        uint32_t d_maxiosz;
+    } da;
+    if (ioctl(fd, _IOR('X', 30, struct xfs_dioattr), &da) >= 0) {
+        bs->bl.request_alignment = da.d_miniosz;
+        /* The kernel returns wrong information for d_mem */
+        /* s->buf_align = da.d_mem; */
     }
 #endif
 
@@ -798,12 +799,6 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
 #endif
     s->needs_alignment = raw_needs_alignment(bs);
 
-#ifdef CONFIG_XFS
-    if (platform_test_xfs_fd(s->fd)) {
-        s->is_xfs = true;
-    }
-#endif
-
     bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK;
     if (S_ISREG(st.st_mode)) {
         /* When extending regular files, we get zeros from the OS */

diff --git a/configure b/configure
index 030728d11e919bc60b82f879c90dbcf50a449839..3a523a3d143bdce3e227217783552de76611263c 100755 (executable)
--- a/configure
+++ b/configure
@@ -291,7 +291,6 @@ EXTRA_CXXFLAGS=""
 EXTRA_LDFLAGS=""
 
 xen_ctrl_version="$default_feature"
-xfs="$default_feature"
 membarrier="$default_feature"
 vhost_kernel="$default_feature"
 vhost_net="$default_feature"
@@ -1021,10 +1020,6 @@ for opt do
   ;;
   --enable-opengl) opengl="yes"
   ;;
-  --disable-xfsctl) xfs="no"
-  ;;
-  --enable-xfsctl) xfs="yes"
-  ;;
   --disable-zlib-test)
   ;;
   --enable-guest-agent) guest_agent="yes"
@@ -1431,7 +1426,6 @@ cat << EOF
   avx512f         AVX512F optimization support
   replication     replication support
   opengl          opengl support
-  xfsctl          xfsctl support
   qom-cast-debug  cast debugging support
   tools           build qemu-io, qemu-nbd and qemu-img tools
   bochs           bochs image format support
@@ -2323,28 +2317,6 @@ EOF
     fi
 fi
 
-##########################################
-# xfsctl() probe, used for file-posix.c
-if test "$xfs" != "no" ; then
-  cat > $TMPC << EOF
-#include <stddef.h>  /* NULL */
-#include <xfs/xfs.h>
-int main(void)
-{
-    xfsctl(NULL, 0, 0, NULL);
-    return 0;
-}
-EOF
-  if compile_prog "" "" ; then
-    xfs="yes"
-  else
-    if test "$xfs" = "yes" ; then
-      feature_not_found "xfs" "Install xfsprogs/xfslibs devel"
-    fi
-    xfs=no
-  fi
-fi
-
 ##########################################
 # plugin linker support probe
 
@@ -3456,9 +3428,6 @@ echo "CONFIG_BDRV_RO_WHITELIST=$block_drv_ro_whitelist" >> $config_host_mak
 if test "$block_drv_whitelist_tools" = "yes" ; then
   echo "CONFIG_BDRV_WHITELIST_TOOLS=y" >> $config_host_mak
 fi
-if test "$xfs" = "yes" ; then
-  echo "CONFIG_XFS=y" >> $config_host_mak
-fi
 qemu_version=$(head $source_path/VERSION)
 echo "PKGVERSION=$pkgversion" >>$config_host_mak
 echo "SRC_PATH=$source_path" >> $config_host_mak

diff --git a/meson.build b/meson.build
index f0567daf42ed367b5d0f4621aae15f36a2ba3467..be592aa942d1233e3c1aacdcc412be2367bccf72 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -3445,7 +3445,6 @@ if spice_protocol.found()
   summary_info += {'  spice server support': spice}
 endif
 summary_info += {'rbd support':       rbd}
-summary_info += {'xfsctl support':    config_host.has_key('CONFIG_XFS')}
 summary_info += {'smartcard support': cacard}
 summary_info += {'U2F support':       u2f}
 summary_info += {'libusb':            libusb}

diff --git a/scripts/ci/org.centos/stream/8/x86_64/configure b/scripts/ci/org.centos/stream/8/x86_64/configure
index 048e80dc495d23e593c4d8490d562552ab14a28b..e05f2fddcc25f3e4be64e40e6f6a9d4a4fc64c05 100755 (executable)
--- a/scripts/ci/org.centos/stream/8/x86_64/configure
+++ b/scripts/ci/org.centos/stream/8/x86_64/configure
@@ -151,7 +151,6 @@
 --disable-whpx \
 --disable-xen \
 --disable-xen-pci-passthrough \
---disable-xfsctl \
 --disable-xkbcommon \
 --disable-zstd \
 --enable-attr \

diff --git a/scripts/coverity-scan/run-coverity-scan b/scripts/coverity-scan/run-coverity-scan
index 7395bbfad49af2b2365f9a66f951bac48b6a3641..6d443250a9b3cc1e4c0e7cab14532f1cc36902f5 100755 (executable)
--- a/scripts/coverity-scan/run-coverity-scan
+++ b/scripts/coverity-scan/run-coverity-scan
@@ -398,7 +398,7 @@ echo "Configuring..."
     --enable-xen --enable-brlapi \
     --enable-linux-aio --enable-attr \
     --enable-cap-ng --enable-trace-backends=log --enable-spice --enable-rbd \
-    --enable-xfsctl --enable-libusb --enable-usb-redir \
+    --enable-libusb --enable-usb-redir \
     --enable-libiscsi --enable-libnfs --enable-seccomp \
     --enable-tpm --enable-libssh --enable-lzo --enable-snappy --enable-bzip2 \
     --enable-numa --enable-rdma --enable-smartcard --enable-virglrenderer \