Fix synchronicity for ZVOLs.

zvol_write() assumes that the write request must be written to stable storage
if rq_is_sync() is true. Unfortunately, this assumption is incorrect. Indeed,
"sync" does *not* mean what we think it means in the context of the Linux
block layer. This is well explained in linux/fs.h:

    WRITE:       A normal async write. Device will be plugged.
    WRITE_SYNC:  Synchronous write. Identical to WRITE, but passes down
                 the hint that someone will be waiting on this IO
                 shortly.
    WRITE_FLUSH: Like WRITE_SYNC but with preceding cache flush.
    WRITE_FUA:   Like WRITE_SYNC but data is guaranteed to be on
                 non-volatile media on completion.

In other words, SYNC does not *mean* that the write must be on stable storage
on completion. It just means that someone is waiting on us to complete the
write request. Thus triggering a ZIL commit for each SYNC write request on a
ZVOL is unnecessary and harmful for performance. To make matters worse, ZVOL
users have no way to express that they actually want data to be written to
stable storage, which means the ZIL is broken for ZVOLs.

The request for stable storage is expressed by the FUA flag, so we must
commit the ZIL after the write if the FUA flag is set. In addition, we must
commit the ZIL before the write if the FLUSH flag is set.

Also, we must inform the block layer that we actually support FLUSH and FUA.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

diff --git a/Makefile.in b/Makefile.in
index 8b28ec0..ba37342 100644 (file)
--- a/Makefile.in
+++ b/Makefile.in
@@ -72,6 +72,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/Makefile.in b/cmd/Makefile.in
index c57b7d4..ba53609 100644 (file)
--- a/cmd/Makefile.in
+++ b/cmd/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/mount_zfs/Makefile.in b/cmd/mount_zfs/Makefile.in
index 1ed8e1b..94e3160 100644 (file)
--- a/cmd/mount_zfs/Makefile.in
+++ b/cmd/mount_zfs/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/sas_switch_id/Makefile.in b/cmd/sas_switch_id/Makefile.in
index ebe9fb0..09826f2 100644 (file)
--- a/cmd/sas_switch_id/Makefile.in
+++ b/cmd/sas_switch_id/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zdb/Makefile.in b/cmd/zdb/Makefile.in
index eb3d70f..7dd5dfc 100644 (file)
--- a/cmd/zdb/Makefile.in
+++ b/cmd/zdb/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zfs/Makefile.in b/cmd/zfs/Makefile.in
index 3e8b260..54f63c7 100644 (file)
--- a/cmd/zfs/Makefile.in
+++ b/cmd/zfs/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zinject/Makefile.in b/cmd/zinject/Makefile.in
index d8a8d6e..59d67f0 100644 (file)
--- a/cmd/zinject/Makefile.in
+++ b/cmd/zinject/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zpios/Makefile.in b/cmd/zpios/Makefile.in
index 7103c01..f357559 100644 (file)
--- a/cmd/zpios/Makefile.in
+++ b/cmd/zpios/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zpool/Makefile.in b/cmd/zpool/Makefile.in
index 2d025b6..cb15fee 100644 (file)
--- a/cmd/zpool/Makefile.in
+++ b/cmd/zpool/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zpool_id/Makefile.in b/cmd/zpool_id/Makefile.in
index 509d917..a6277ef 100644 (file)
--- a/cmd/zpool_id/Makefile.in
+++ b/cmd/zpool_id/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zpool_layout/Makefile.in b/cmd/zpool_layout/Makefile.in
index 9ff60f0..12f21e5 100644 (file)
--- a/cmd/zpool_layout/Makefile.in
+++ b/cmd/zpool_layout/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/ztest/Makefile.in b/cmd/ztest/Makefile.in
index fb89791..85fdde0 100644 (file)
--- a/cmd/ztest/Makefile.in
+++ b/cmd/ztest/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/cmd/zvol_id/Makefile.in b/cmd/zvol_id/Makefile.in
index 83fc24f..2c22c80 100644 (file)
--- a/cmd/zvol_id/Makefile.in
+++ b/cmd/zvol_id/Makefile.in
@@ -52,6 +52,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/config/kernel-blk-queue-flush.m4 b/config/kernel-blk-queue-flush.m4
new file mode 100644 (file)
index 0000000..06561ed
--- /dev/null
+++ b/config/kernel-blk-queue-flush.m4
@@ -0,0 +1,46 @@
+dnl #
+dnl # 2.6.36 API change
+dnl # In 2.6.36 kernels the blk_queue_ordered() interface has been
+dnl # replaced by the simpler blk_queue_flush().  However, while the
+dnl # old interface was available to all the new one is GPL-only.
+dnl # Thus in addition to detecting if this function is available
+dnl # we determine if it is GPL-only.  If the GPL-only interface is
+dnl # there we implement our own compatibility function, otherwise
+dnl # we use the function.  The hope is that long term this function
+dnl # will be opened up.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLUSH], [
+       AC_MSG_CHECKING([whether blk_queue_flush() is available])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/blkdev.h>
+       ],[
+               struct request_queue *q = NULL;
+               (void) blk_queue_flush(q, REQ_FLUSH);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BLK_QUEUE_FLUSH, 1,
+                         [blk_queue_flush() is available])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+
+       AC_MSG_CHECKING([whether blk_queue_flush() is GPL-only])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/module.h>
+               #include <linux/blkdev.h>
+
+               MODULE_LICENSE("CDDL");
+       ],[
+               struct request_queue *q = NULL;
+               (void) blk_queue_flush(q, REQ_FLUSH);
+       ],[
+               AC_MSG_RESULT(no)
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY, 1,
+                         [blk_queue_flush() is GPL-only])
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])

diff --git a/config/kernel.m4 b/config/kernel.m4
index 10a2cdb..a2a819c 100644 (file)
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -21,6 +21,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
        ZFS_AC_KERNEL_BIO_RW_SYNCIO
        ZFS_AC_KERNEL_REQ_SYNC
        ZFS_AC_KERNEL_BLK_END_REQUEST
+       ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
        ZFS_AC_KERNEL_BLK_FETCH_REQUEST
        ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
        ZFS_AC_KERNEL_BLK_RQ_BYTES

diff --git a/configure b/configure
index e5004b5..dd3a6f9 100755 (executable)
--- a/configure
+++ b/configure
@@ -13675,6 +13675,143 @@ fi
        EXTRA_KCFLAGS="$tmp_flags"
 
 
+       { $as_echo "$as_me:$LINENO: checking whether blk_queue_flush() is available" >&5
+$as_echo_n "checking whether blk_queue_flush() is available... " >&6; }
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+               #include <linux/blkdev.h>
+
+int
+main (void)
+{
+
+               struct request_queue *q = NULL;
+               (void) blk_queue_flush(q, REQ_FLUSH);
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+       rm -Rf build && mkdir -p build
+       echo "obj-m := conftest.o" >build/Makefile
+       if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+               { $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_BLK_QUEUE_FLUSH 1
+_ACEOF
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+               { $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+       rm -Rf build
+
+
+
+       { $as_echo "$as_me:$LINENO: checking whether blk_queue_flush() is GPL-only" >&5
+$as_echo_n "checking whether blk_queue_flush() is GPL-only... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+               #include <linux/module.h>
+               #include <linux/blkdev.h>
+
+               MODULE_LICENSE("CDDL");
+
+int
+main (void)
+{
+
+               struct request_queue *q = NULL;
+               (void) blk_queue_flush(q, REQ_FLUSH);
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+       rm -Rf build && mkdir -p build
+       echo "obj-m := conftest.o" >build/Makefile
+       if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+               { $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+               { $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_BLK_QUEUE_FLUSH_GPL_ONLY 1
+_ACEOF
+
+
+
+
+fi
+
+       rm -Rf build
+
+
+       EXTRA_KCFLAGS="$tmp_flags"
+
+
        { $as_echo "$as_me:$LINENO: checking whether blk_fetch_request() is available" >&5
 $as_echo_n "checking whether blk_fetch_request() is available... " >&6; }
        tmp_flags="$EXTRA_KCFLAGS"
@@ -18871,6 +19008,143 @@ fi
        EXTRA_KCFLAGS="$tmp_flags"
 
 
+       { $as_echo "$as_me:$LINENO: checking whether blk_queue_flush() is available" >&5
+$as_echo_n "checking whether blk_queue_flush() is available... " >&6; }
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+               #include <linux/blkdev.h>
+
+int
+main (void)
+{
+
+               struct request_queue *q = NULL;
+               (void) blk_queue_flush(q, REQ_FLUSH);
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+       rm -Rf build && mkdir -p build
+       echo "obj-m := conftest.o" >build/Makefile
+       if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+               { $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_BLK_QUEUE_FLUSH 1
+_ACEOF
+
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+               { $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+
+
+fi
+
+       rm -Rf build
+
+
+
+       { $as_echo "$as_me:$LINENO: checking whether blk_queue_flush() is GPL-only" >&5
+$as_echo_n "checking whether blk_queue_flush() is GPL-only... " >&6; }
+
+
+cat confdefs.h - <<_ACEOF >conftest.c
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+
+               #include <linux/module.h>
+               #include <linux/blkdev.h>
+
+               MODULE_LICENSE("CDDL");
+
+int
+main (void)
+{
+
+               struct request_queue *q = NULL;
+               (void) blk_queue_flush(q, REQ_FLUSH);
+
+  ;
+  return 0;
+}
+
+_ACEOF
+
+
+       rm -Rf build && mkdir -p build
+       echo "obj-m := conftest.o" >build/Makefile
+       if { ac_try='cp conftest.c build && make modules -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } >/dev/null && { ac_try='test -s build/conftest.o'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+               { $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+               { $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_BLK_QUEUE_FLUSH_GPL_ONLY 1
+_ACEOF
+
+
+
+
+fi
+
+       rm -Rf build
+
+
+       EXTRA_KCFLAGS="$tmp_flags"
+
+
        { $as_echo "$as_me:$LINENO: checking whether blk_fetch_request() is available" >&5
 $as_echo_n "checking whether blk_fetch_request() is available... " >&6; }
        tmp_flags="$EXTRA_KCFLAGS"

diff --git a/dracut/90zfs/Makefile.in b/dracut/90zfs/Makefile.in
index c2dbb20..77439a0 100644 (file)
--- a/dracut/90zfs/Makefile.in
+++ b/dracut/90zfs/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/dracut/Makefile.in b/dracut/Makefile.in
index 098321a..e1bfd5a 100644 (file)
--- a/dracut/Makefile.in
+++ b/dracut/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/etc/Makefile.in b/etc/Makefile.in
index f3c4db4..8af2d9a 100644 (file)
--- a/etc/Makefile.in
+++ b/etc/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/etc/init.d/Makefile.in b/etc/init.d/Makefile.in
index 0f73354..3baf4c0 100644 (file)
--- a/etc/init.d/Makefile.in
+++ b/etc/init.d/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/etc/zfs/Makefile.in b/etc/zfs/Makefile.in
index 1773e37..0c7e35d 100644 (file)
--- a/etc/zfs/Makefile.in
+++ b/etc/zfs/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/include/Makefile.in b/include/Makefile.in
index f079cde..c9e8a83 100644 (file)
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/include/linux/Makefile.in b/include/linux/Makefile.in
index a50f24d..815d089 100644 (file)
--- a/include/linux/Makefile.in
+++ b/include/linux/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h
index 0a7c985..3707fad 100644 (file)
--- a/include/linux/blkdev_compat.h
+++ b/include/linux/blkdev_compat.h
@@ -132,6 +132,23 @@ blk_end_request_x(struct request *req, int error, unsigned int nr_bytes)
 # endif /* HAVE_BLK_END_REQUEST_GPL_ONLY */
 #endif /* HAVE_BLK_END_REQUEST */
 
+/*
+ * 2.6.36 API change,
+ * The blk_queue_flush() interface has replaced blk_queue_ordered()
+ * interface.  However, while the old interface was available to all the
+ * new one is GPL-only.   Thus if the GPL-only version is detected we
+ * implement our own trivial helper compatibility funcion.   The hope is
+ * that long term this function will be opened up.
+ */
+#if defined(HAVE_BLK_QUEUE_FLUSH) && defined(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY)
+#define blk_queue_flush __blk_queue_flush
+static inline void
+__blk_queue_flush(struct request_queue *q, unsigned int flags)
+{
+       q->flush_flags = flags & (REQ_FLUSH | REQ_FUA);
+}
+#endif /* HAVE_BLK_QUEUE_FLUSH && HAVE_BLK_QUEUE_FLUSH_GPL_ONLY */
+
 #ifndef HAVE_BLK_RQ_POS
 static inline sector_t
 blk_rq_pos(struct request *req)
@@ -345,11 +362,19 @@ bio_set_flags_failfast(struct block_device *bdev, int *flags)
  * allow richer semantics to be expressed to the block layer.  It is
  * the block layers responsibility to choose the correct way to
  * implement these semantics.
+ *
+ * The existence of these flags implies that REQ_FLUSH an REQ_FUA are
+ * defined.  Thus we can safely define VDEV_REQ_FLUSH and VDEV_REQ_FUA
+ * compatibility macros.
  */
 #ifdef WRITE_FLUSH_FUA
 # define VDEV_WRITE_FLUSH_FUA          WRITE_FLUSH_FUA
+# define VDEV_REQ_FLUSH                        REQ_FLUSH
+# define VDEV_REQ_FUA                  REQ_FUA
 #else
 # define VDEV_WRITE_FLUSH_FUA          WRITE_BARRIER
+# define VDEV_REQ_FLUSH                        REQ_HARDBARRIER
+# define VDEV_REQ_FUA                  REQ_HARDBARRIER
 #endif
 
 /*

diff --git a/include/sys/Makefile.in b/include/sys/Makefile.in
index 1404894..93742b0 100644 (file)
--- a/include/sys/Makefile.in
+++ b/include/sys/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/include/sys/fm/Makefile.in b/include/sys/fm/Makefile.in
index 889bab1..f3bfcd3 100644 (file)
--- a/include/sys/fm/Makefile.in
+++ b/include/sys/fm/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/include/sys/fm/fs/Makefile.in b/include/sys/fm/fs/Makefile.in
index 0d7f619..8e87ecb 100644 (file)
--- a/include/sys/fm/fs/Makefile.in
+++ b/include/sys/fm/fs/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/include/sys/fs/Makefile.in b/include/sys/fs/Makefile.in
index cad07ac..dee6403 100644 (file)
--- a/include/sys/fs/Makefile.in
+++ b/include/sys/fs/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/Makefile.in b/lib/Makefile.in
index 45180ae..3f8a9b4 100644 (file)
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libavl/Makefile.in b/lib/libavl/Makefile.in
index 7dc892e..361e74d 100644 (file)
--- a/lib/libavl/Makefile.in
+++ b/lib/libavl/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libefi/Makefile.in b/lib/libefi/Makefile.in
index c8417cd..92865fd 100644 (file)
--- a/lib/libefi/Makefile.in
+++ b/lib/libefi/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libnvpair/Makefile.in b/lib/libnvpair/Makefile.in
index b2e8e22..95d09ac 100644 (file)
--- a/lib/libnvpair/Makefile.in
+++ b/lib/libnvpair/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libshare/Makefile.in b/lib/libshare/Makefile.in
index 665f059..2355023 100644 (file)
--- a/lib/libshare/Makefile.in
+++ b/lib/libshare/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/Makefile.in b/lib/libspl/Makefile.in
index dbfffab..4db8c35 100644 (file)
--- a/lib/libspl/Makefile.in
+++ b/lib/libspl/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/asm-generic/Makefile.in b/lib/libspl/asm-generic/Makefile.in
index ba6db6d..f838c91 100644 (file)
--- a/lib/libspl/asm-generic/Makefile.in
+++ b/lib/libspl/asm-generic/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/asm-i386/Makefile.in b/lib/libspl/asm-i386/Makefile.in
index 92a12c5..4d8e450 100644 (file)
--- a/lib/libspl/asm-i386/Makefile.in
+++ b/lib/libspl/asm-i386/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/asm-x86_64/Makefile.in b/lib/libspl/asm-x86_64/Makefile.in
index 227f87b..9edbecf 100644 (file)
--- a/lib/libspl/asm-x86_64/Makefile.in
+++ b/lib/libspl/asm-x86_64/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/Makefile.in b/lib/libspl/include/Makefile.in
index ed4b369..c04faa5 100644 (file)
--- a/lib/libspl/include/Makefile.in
+++ b/lib/libspl/include/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/ia32/Makefile.in b/lib/libspl/include/ia32/Makefile.in
index 148f2bf..eeccf56 100644 (file)
--- a/lib/libspl/include/ia32/Makefile.in
+++ b/lib/libspl/include/ia32/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/ia32/sys/Makefile.in b/lib/libspl/include/ia32/sys/Makefile.in
index 5d6d54d..246f719 100644 (file)
--- a/lib/libspl/include/ia32/sys/Makefile.in
+++ b/lib/libspl/include/ia32/sys/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/rpc/Makefile.in b/lib/libspl/include/rpc/Makefile.in
index 9614d17..d70ce70 100644 (file)
--- a/lib/libspl/include/rpc/Makefile.in
+++ b/lib/libspl/include/rpc/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/sys/Makefile.in b/lib/libspl/include/sys/Makefile.in
index 058d095..201b179 100644 (file)
--- a/lib/libspl/include/sys/Makefile.in
+++ b/lib/libspl/include/sys/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/sys/dktp/Makefile.in b/lib/libspl/include/sys/dktp/Makefile.in
index f758147..bbbd459 100644 (file)
--- a/lib/libspl/include/sys/dktp/Makefile.in
+++ b/lib/libspl/include/sys/dktp/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/sys/sysevent/Makefile.in b/lib/libspl/include/sys/sysevent/Makefile.in
index 217582b..9a58c51 100644 (file)
--- a/lib/libspl/include/sys/sysevent/Makefile.in
+++ b/lib/libspl/include/sys/sysevent/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libspl/include/util/Makefile.in b/lib/libspl/include/util/Makefile.in
index 8c1f290..94d0d27 100644 (file)
--- a/lib/libspl/include/util/Makefile.in
+++ b/lib/libspl/include/util/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libunicode/Makefile.in b/lib/libunicode/Makefile.in
index 3ee6bb9..53f8be1 100644 (file)
--- a/lib/libunicode/Makefile.in
+++ b/lib/libunicode/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libuutil/Makefile.in b/lib/libuutil/Makefile.in
index 2134294..c0fc9dc 100644 (file)
--- a/lib/libuutil/Makefile.in
+++ b/lib/libuutil/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libzfs/Makefile.in b/lib/libzfs/Makefile.in
index 78bc72c..45384f8 100644 (file)
--- a/lib/libzfs/Makefile.in
+++ b/lib/libzfs/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/lib/libzpool/Makefile.in b/lib/libzpool/Makefile.in
index 8f7d10d..238e0b3 100644 (file)
--- a/lib/libzpool/Makefile.in
+++ b/lib/libzpool/Makefile.in
@@ -51,6 +51,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/man/Makefile.in b/man/Makefile.in
index b06cb37..7e50717 100644 (file)
--- a/man/Makefile.in
+++ b/man/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/man/man8/Makefile.in b/man/man8/Makefile.in
index debc9e5..11e3549 100644 (file)
--- a/man/man8/Makefile.in
+++ b/man/man8/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
index 9dda040..0aaa268 100644 (file)
--- a/module/zfs/zvol.c
+++ b/module/zfs/zvol.c
@@ -534,6 +534,17 @@ zvol_write(void *arg)
        dmu_tx_t *tx;
        rl_t *rl;
 
+       if (req->cmd_flags & VDEV_REQ_FLUSH)
+               zil_commit(zv->zv_zilog, ZVOL_OBJ);
+
+       /*
+        * Some requests are just for flush and nothing else.
+        */
+       if (size == 0) {
+               blk_end_request(req, 0, size);
+               return;
+       }
+
        rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_WRITER);
 
        tx = dmu_tx_create(zv->zv_objset);
@@ -550,12 +561,14 @@ zvol_write(void *arg)
 
        error = dmu_write_req(zv->zv_objset, ZVOL_OBJ, req, tx);
        if (error == 0)
-               zvol_log_write(zv, tx, offset, size, rq_is_sync(req));
+               zvol_log_write(zv, tx, offset, size,
+                   req->cmd_flags & VDEV_REQ_FUA);
 
        dmu_tx_commit(tx);
        zfs_range_unlock(rl);
 
-       if (rq_is_sync(req) || zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)
+       if ((req->cmd_flags & VDEV_REQ_FUA) ||
+           zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)
                zil_commit(zv->zv_zilog, ZVOL_OBJ);
 
        blk_end_request(req, -error, size);
@@ -578,6 +591,11 @@ zvol_read(void *arg)
        int error;
        rl_t *rl;
 
+       if (size == 0) {
+               blk_end_request(req, 0, size);
+               return;
+       }
+
        rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER);
 
        error = dmu_read_req(zv->zv_objset, ZVOL_OBJ, req);
@@ -627,7 +645,7 @@ zvol_request(struct request_queue *q)
        while ((req = blk_fetch_request(q)) != NULL) {
                size = blk_rq_bytes(req);
 
-               if (blk_rq_pos(req) + blk_rq_sectors(req) >
+               if (size != 0 && blk_rq_pos(req) + blk_rq_sectors(req) >
                    get_capacity(zv->zv_disk)) {
                        printk(KERN_INFO
                               "%s: bad access: block=%llu, count=%lu\n",
@@ -1062,6 +1080,12 @@ zvol_alloc(dev_t dev, const char *name)
        if (zv->zv_queue == NULL)
                goto out_kmem;
 
+#ifdef HAVE_BLK_QUEUE_FLUSH
+       blk_queue_flush(zv->zv_queue, VDEV_REQ_FLUSH | VDEV_REQ_FUA);
+#else
+       blk_queue_ordered(zv->zv_queue, QUEUE_ORDERED_DRAIN, NULL);
+#endif /* HAVE_BLK_QUEUE_FLUSH */
+
        zv->zv_disk = alloc_disk(ZVOL_MINORS);
        if (zv->zv_disk == NULL)
                goto out_queue;

diff --git a/scripts/Makefile.in b/scripts/Makefile.in
index 4e61705..e762912 100644 (file)
--- a/scripts/Makefile.in
+++ b/scripts/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/scripts/zpios-profile/Makefile.in b/scripts/zpios-profile/Makefile.in
index 6acead7..5384161 100644 (file)
--- a/scripts/zpios-profile/Makefile.in
+++ b/scripts/zpios-profile/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/scripts/zpios-test/Makefile.in b/scripts/zpios-test/Makefile.in
index 2a814d9..ec5f01e 100644 (file)
--- a/scripts/zpios-test/Makefile.in
+++ b/scripts/zpios-test/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/scripts/zpool-config/Makefile.in b/scripts/zpool-config/Makefile.in
index 8c3dc4e..f60ecf8 100644 (file)
--- a/scripts/zpool-config/Makefile.in
+++ b/scripts/zpool-config/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/scripts/zpool-layout/Makefile.in b/scripts/zpool-layout/Makefile.in
index fc4c275..61b1b06 100644 (file)
--- a/scripts/zpool-layout/Makefile.in
+++ b/scripts/zpool-layout/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/udev/Makefile.in b/udev/Makefile.in
index 1884df2..498fb73 100644 (file)
--- a/udev/Makefile.in
+++ b/udev/Makefile.in
@@ -49,6 +49,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/udev/rules.d/Makefile.in b/udev/rules.d/Makefile.in
index 57f406f..473ae0b 100644 (file)
--- a/udev/rules.d/Makefile.in
+++ b/udev/rules.d/Makefile.in
@@ -50,6 +50,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \
        $(top_srcdir)/config/kernel-blk-end-request.m4 \
        $(top_srcdir)/config/kernel-blk-fetch-request.m4 \
+       $(top_srcdir)/config/kernel-blk-queue-flush.m4 \
        $(top_srcdir)/config/kernel-blk-requeue-request.m4 \
        $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
        $(top_srcdir)/config/kernel-blk-rq-pos.m4 \

diff --git a/zfs_config.h.in b/zfs_config.h.in
index f64a302..b14be65 100644 (file)
--- a/zfs_config.h.in
+++ b/zfs_config.h.in
@@ -51,6 +51,12 @@
 /* blk_fetch_request() is available */
 #undef HAVE_BLK_FETCH_REQUEST
 
+/* blk_queue_flush() is available */
+#undef HAVE_BLK_QUEUE_FLUSH
+
+/* blk_queue_flush() is GPL-only */
+#undef HAVE_BLK_QUEUE_FLUSH_GPL_ONLY
+
 /* blk_requeue_request() is available */
 #undef HAVE_BLK_REQUEUE_REQUEST