Add backing_device_info per-filesystem

For a long time now the kernel has been moving away from using the
pdflush daemon to write 'old' dirty pages to disk.  The primary reason
for this is because the pdflush daemon is single threaded and can be
a limiting factor for performance.  Since pdflush sequentially walks
the dirty inode list for each super block any delay in processing can
slow down dirty page writeback for all filesystems.

The replacement for pdflush is called bdi (backing device info).  The
bdi system involves creating a per-filesystem control structure each
with its own private sets of queues to manage writeback.  The advantage
is greater parallelism which improves performance and prevents a single
filesystem from slowing writeback to the others.

For a long time both systems co-existed in the kernel so it wasn't
strictly required to implement the bdi scheme.  However, as of
Linux 2.6.36 kernels the pdflush functionality has been retired.

Since ZFS already bypasses the page cache for most I/O this is only
an issue for mmap(2) writes which must go through the page cache.
Even then adding this missing support for newer kernels was overlooked
because there are other mechanisms which can trigger writeback.

However, there is one critical case where not implementing the bdi
functionality can cause problems.  If an application handles a page
fault it can enter the balance_dirty_pages() callpath.  This will
result in the application hanging until the number of dirty pages in
the system drops below the dirty ratio.

Without a registered backing_device_info for the filesystem the
dirty pages will not get written out.  Thus the application will hang.
As mentioned above this was less of an issue with older kernels because
pdflush would eventually write out the dirty pages.

This change adds a backing_device_info structure to the zfs_sb_t
which is already allocated per-super block.  It is then registered
when the filesystem mounted and unregistered on unmount.  It will
not be registered for mounted snapshots which are read-only.  This
change will result in flush-<pool> thread being dynamically created
and destroyed per-mounted filesystem for writeback.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #174

diff --git a/Makefile.in b/Makefile.in
index 1e38611..dc46e32 100644 (file)
--- a/Makefile.in
+++ b/Makefile.in
@@ -56,6 +56,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/Makefile.in b/cmd/Makefile.in
index 379fbf9..7d868d8 100644 (file)
--- a/cmd/Makefile.in
+++ b/cmd/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/mount_zfs/Makefile.in b/cmd/mount_zfs/Makefile.in
index 97aa729..ccd7a15 100644 (file)
--- a/cmd/mount_zfs/Makefile.in
+++ b/cmd/mount_zfs/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/sas_switch_id/Makefile.in b/cmd/sas_switch_id/Makefile.in
index bb6c03a..34bb462 100644 (file)
--- a/cmd/sas_switch_id/Makefile.in
+++ b/cmd/sas_switch_id/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zdb/Makefile.in b/cmd/zdb/Makefile.in
index c0db545..bc78a75 100644 (file)
--- a/cmd/zdb/Makefile.in
+++ b/cmd/zdb/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zfs/Makefile.in b/cmd/zfs/Makefile.in
index 42a4884..7a11189 100644 (file)
--- a/cmd/zfs/Makefile.in
+++ b/cmd/zfs/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zinject/Makefile.in b/cmd/zinject/Makefile.in
index b0210f8..1897fd0 100644 (file)
--- a/cmd/zinject/Makefile.in
+++ b/cmd/zinject/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zpios/Makefile.in b/cmd/zpios/Makefile.in
index 363617f..ade9237 100644 (file)
--- a/cmd/zpios/Makefile.in
+++ b/cmd/zpios/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zpool/Makefile.in b/cmd/zpool/Makefile.in
index 4d2340e..89c7aac 100644 (file)
--- a/cmd/zpool/Makefile.in
+++ b/cmd/zpool/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zpool_id/Makefile.in b/cmd/zpool_id/Makefile.in
index b4d250a..f4e837c 100644 (file)
--- a/cmd/zpool_id/Makefile.in
+++ b/cmd/zpool_id/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zpool_layout/Makefile.in b/cmd/zpool_layout/Makefile.in
index 3445915..e38308a 100644 (file)
--- a/cmd/zpool_layout/Makefile.in
+++ b/cmd/zpool_layout/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/ztest/Makefile.in b/cmd/ztest/Makefile.in
index 5e8d451..a9460c6 100644 (file)
--- a/cmd/ztest/Makefile.in
+++ b/cmd/ztest/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/cmd/zvol_id/Makefile.in b/cmd/zvol_id/Makefile.in
index 114fa20..ed80d40 100644 (file)
--- a/cmd/zvol_id/Makefile.in
+++ b/cmd/zvol_id/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/config/kernel-bdi.m4 b/config/kernel-bdi.m4
new file mode 100644 (file)
index 0000000..34ffaab
--- /dev/null
+++ b/config/kernel-bdi.m4
@@ -0,0 +1,18 @@
+dnl #
+dnl # 2.6.32 API change
+dnl # Private backing_device_info interfaces available
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_BDI], [
+       AC_MSG_CHECKING([whether super_block has s_bdi])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+       ],[
+               struct super_block sb __attribute__ ((unused));
+               sb.s_bdi = NULL;
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_BDI, 1, [struct super_block has s_bdi])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])

diff --git a/config/kernel.m4 b/config/kernel.m4
index 5eaa4d8..87c49a8 100644 (file)
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -40,6 +40,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
        ZFS_AC_KERNEL_TRUNCATE_SETSIZE
        ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
        ZFS_AC_KERNEL_MOUNT_NODEV
+       ZFS_AC_KERNEL_BDI
 
        if test "$LINUX_OBJ" != "$LINUX"; then
                KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"

diff --git a/configure b/configure
index f46cc51..9f44463 100755 (executable)
--- a/configure
+++ b/configure
@@ -14686,6 +14686,72 @@ _ACEOF
 
 
 
+       { $as_echo "$as_me:$LINENO: checking whether super_block has s_bdi" >&5
+$as_echo_n "checking whether super_block has s_bdi... " >&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/fs.h>
+
+int
+main (void)
+{
+
+               struct super_block sb __attribute__ ((unused));
+               sb.s_bdi = NULL;
+
+  ;
+  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_BDI 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
+
+
+
+
        if test "$LINUX_OBJ" != "$LINUX"; then
                KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
        fi
@@ -18956,6 +19022,72 @@ _ACEOF
 
 
 
+       { $as_echo "$as_me:$LINENO: checking whether super_block has s_bdi" >&5
+$as_echo_n "checking whether super_block has s_bdi... " >&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/fs.h>
+
+int
+main (void)
+{
+
+               struct super_block sb __attribute__ ((unused));
+               sb.s_bdi = NULL;
+
+  ;
+  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_BDI 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
+
+
+
+
        if test "$LINUX_OBJ" != "$LINUX"; then
                KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
        fi

diff --git a/dracut/90zfs/Makefile.in b/dracut/90zfs/Makefile.in
index 33ac12c..d395929 100644 (file)
--- a/dracut/90zfs/Makefile.in
+++ b/dracut/90zfs/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/dracut/Makefile.in b/dracut/Makefile.in
index 66ec11d..ee654de 100644 (file)
--- a/dracut/Makefile.in
+++ b/dracut/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/etc/Makefile.in b/etc/Makefile.in
index c3ed6f2..4f012e5 100644 (file)
--- a/etc/Makefile.in
+++ b/etc/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/etc/init.d/Makefile.in b/etc/init.d/Makefile.in
index 1ea6c62..7fb9034 100644 (file)
--- a/etc/init.d/Makefile.in
+++ b/etc/init.d/Makefile.in
@@ -44,6 +44,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/etc/udev/Makefile.in b/etc/udev/Makefile.in
index 81ba8b2..7a9a0c3 100644 (file)
--- a/etc/udev/Makefile.in
+++ b/etc/udev/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/etc/udev/rules.d/Makefile.in b/etc/udev/rules.d/Makefile.in
index f5dce7f..852d44d 100644 (file)
--- a/etc/udev/rules.d/Makefile.in
+++ b/etc/udev/rules.d/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/etc/zfs/Makefile.in b/etc/zfs/Makefile.in
index 1f3db54..ffdd1a9 100644 (file)
--- a/etc/zfs/Makefile.in
+++ b/etc/zfs/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/include/Makefile.in b/include/Makefile.in
index 379657f..8764d09 100644 (file)
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/include/linux/Makefile.in b/include/linux/Makefile.in
index e0678c1..3a901c3 100644 (file)
--- a/include/linux/Makefile.in
+++ b/include/linux/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/include/linux/vfs_compat.h b/include/linux/vfs_compat.h
index 1d8a523..cbbf21e 100644 (file)
--- a/include/linux/vfs_compat.h
+++ b/include/linux/vfs_compat.h
@@ -62,4 +62,23 @@ truncate_setsize(struct inode *ip, loff_t new)
 }
 #endif /* HAVE_TRUNCATE_SETSIZE */
 
+/*
+ * 2.6.32 API change,
+ * Added backing_device_info (bdi) per super block interfaces.  When
+ * available a bdi must be configured when using a non-device backed
+ * filesystem for proper writeback.  It's safe to leave this code
+ * dormant for kernels which only support pdflush and not bdi.
+ */
+#ifdef HAVE_BDI
+#define        bdi_get_sb(sb)                          (sb->s_bdi)
+#define        bdi_put_sb(sb, bdi)                     (sb->s_bdi = bdi)
+#else
+#define        bdi_init(bdi)                           (0)
+#define        bdi_destroy(bdi)                        (0)
+#define        bdi_register(bdi, parent, fmt, args)    (0)
+#define        bdi_unregister(bdi)                     (0)
+#define        bdi_get_sb(sb)                          (0)
+#define        bdi_put_sb(sb, bdi)                     (0)
+#endif /* HAVE_BDI */
+
 #endif /* _ZFS_VFS_H */

diff --git a/include/sys/Makefile.in b/include/sys/Makefile.in
index 53c721f..4cf397c 100644 (file)
--- a/include/sys/Makefile.in
+++ b/include/sys/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/include/sys/fm/Makefile.in b/include/sys/fm/Makefile.in
index fce681a..30d2c4a 100644 (file)
--- a/include/sys/fm/Makefile.in
+++ b/include/sys/fm/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/include/sys/fm/fs/Makefile.in b/include/sys/fm/fs/Makefile.in
index 859972f..76a2157 100644 (file)
--- a/include/sys/fm/fs/Makefile.in
+++ b/include/sys/fm/fs/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/include/sys/fs/Makefile.in b/include/sys/fs/Makefile.in
index 61c97ab..8567e01 100644 (file)
--- a/include/sys/fs/Makefile.in
+++ b/include/sys/fs/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/include/sys/zfs_vfsops.h b/include/sys/zfs_vfsops.h
index ae5f811..c8861f6 100644 (file)
--- a/include/sys/zfs_vfsops.h
+++ b/include/sys/zfs_vfsops.h
@@ -43,6 +43,7 @@ struct znode;
 
 typedef struct zfs_sb {
        struct super_block *z_sb;       /* generic super_block */
+       struct backing_dev_info z_bdi;  /* generic backing dev info */
        struct zfs_sb   *z_parent;      /* parent fs */
        objset_t        *z_os;          /* objset reference */
        uint64_t        z_flags;        /* super_block flags */

diff --git a/lib/Makefile.in b/lib/Makefile.in
index 0012354..2f8d492 100644 (file)
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libavl/Makefile.in b/lib/libavl/Makefile.in
index 05a76d4..33484b3 100644 (file)
--- a/lib/libavl/Makefile.in
+++ b/lib/libavl/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libefi/Makefile.in b/lib/libefi/Makefile.in
index 17cf684..ec4e14a 100644 (file)
--- a/lib/libefi/Makefile.in
+++ b/lib/libefi/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libnvpair/Makefile.in b/lib/libnvpair/Makefile.in
index 02c3511..7d3eaa4 100644 (file)
--- a/lib/libnvpair/Makefile.in
+++ b/lib/libnvpair/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libshare/Makefile.in b/lib/libshare/Makefile.in
index b2af5fd..6254a97 100644 (file)
--- a/lib/libshare/Makefile.in
+++ b/lib/libshare/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/Makefile.in b/lib/libspl/Makefile.in
index 11b517a..238ab00 100644 (file)
--- a/lib/libspl/Makefile.in
+++ b/lib/libspl/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/asm-generic/Makefile.in b/lib/libspl/asm-generic/Makefile.in
index 4356f51..6fe820c 100644 (file)
--- a/lib/libspl/asm-generic/Makefile.in
+++ b/lib/libspl/asm-generic/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/asm-i386/Makefile.in b/lib/libspl/asm-i386/Makefile.in
index 4346d0d..1f951ad 100644 (file)
--- a/lib/libspl/asm-i386/Makefile.in
+++ b/lib/libspl/asm-i386/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/asm-x86_64/Makefile.in b/lib/libspl/asm-x86_64/Makefile.in
index e9bab07..10226a9 100644 (file)
--- a/lib/libspl/asm-x86_64/Makefile.in
+++ b/lib/libspl/asm-x86_64/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/Makefile.in b/lib/libspl/include/Makefile.in
index 4990f24..88b8404 100644 (file)
--- a/lib/libspl/include/Makefile.in
+++ b/lib/libspl/include/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/ia32/Makefile.in b/lib/libspl/include/ia32/Makefile.in
index e54dd3b..36af1a8 100644 (file)
--- a/lib/libspl/include/ia32/Makefile.in
+++ b/lib/libspl/include/ia32/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/ia32/sys/Makefile.in b/lib/libspl/include/ia32/sys/Makefile.in
index cbcc2e4..ff11b1d 100644 (file)
--- a/lib/libspl/include/ia32/sys/Makefile.in
+++ b/lib/libspl/include/ia32/sys/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/rpc/Makefile.in b/lib/libspl/include/rpc/Makefile.in
index 1336645..e2ae91c 100644 (file)
--- a/lib/libspl/include/rpc/Makefile.in
+++ b/lib/libspl/include/rpc/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/sys/Makefile.in b/lib/libspl/include/sys/Makefile.in
index ae28b42..eeaca9b 100644 (file)
--- a/lib/libspl/include/sys/Makefile.in
+++ b/lib/libspl/include/sys/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/sys/dktp/Makefile.in b/lib/libspl/include/sys/dktp/Makefile.in
index 0d33f46..c9b0115 100644 (file)
--- a/lib/libspl/include/sys/dktp/Makefile.in
+++ b/lib/libspl/include/sys/dktp/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/sys/sysevent/Makefile.in b/lib/libspl/include/sys/sysevent/Makefile.in
index 99d2433..c37669f 100644 (file)
--- a/lib/libspl/include/sys/sysevent/Makefile.in
+++ b/lib/libspl/include/sys/sysevent/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libspl/include/util/Makefile.in b/lib/libspl/include/util/Makefile.in
index 5539378..70ce973 100644 (file)
--- a/lib/libspl/include/util/Makefile.in
+++ b/lib/libspl/include/util/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libunicode/Makefile.in b/lib/libunicode/Makefile.in
index faa940e..6b5d575 100644 (file)
--- a/lib/libunicode/Makefile.in
+++ b/lib/libunicode/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libuutil/Makefile.in b/lib/libuutil/Makefile.in
index 45c4e84..2c2c8e5 100644 (file)
--- a/lib/libuutil/Makefile.in
+++ b/lib/libuutil/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libzfs/Makefile.in b/lib/libzfs/Makefile.in
index 5dc7d35..ad31c72 100644 (file)
--- a/lib/libzfs/Makefile.in
+++ b/lib/libzfs/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/lib/libzpool/Makefile.in b/lib/libzpool/Makefile.in
index 212c964..1b60fe3 100644 (file)
--- a/lib/libzpool/Makefile.in
+++ b/lib/libzpool/Makefile.in
@@ -43,6 +43,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/man/Makefile.in b/man/Makefile.in
index 3c9e7a3..068617b 100644 (file)
--- a/man/Makefile.in
+++ b/man/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/man/man8/Makefile.in b/man/man8/Makefile.in
index 1c18675..f9fe5fb 100644 (file)
--- a/man/man8/Makefile.in
+++ b/man/man8/Makefile.in
@@ -41,6 +41,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/module/zfs/zfs_vfsops.c b/module/zfs/zfs_vfsops.c
index e0987e9..31692f4 100644 (file)
--- a/module/zfs/zfs_vfsops.c
+++ b/module/zfs/zfs_vfsops.c
@@ -600,6 +600,12 @@ zfs_sb_create(const char *osname, zfs_sb_t **zsbp)
        zsb->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
        zsb->z_os = os;
 
+       error = -bdi_init(&zsb->z_bdi);
+       if (error) {
+               kmem_free(zsb, sizeof (zfs_sb_t));
+               return (error);
+       }
+
        error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zsb->z_version);
        if (error) {
                goto out;
@@ -799,6 +805,7 @@ zfs_sb_free(zfs_sb_t *zsb)
 
        zfs_fuid_destroy(zsb);
 
+       bdi_destroy(&zsb->z_bdi);
        mutex_destroy(&zsb->z_znodes_lock);
        mutex_destroy(&zsb->z_lock);
        list_destroy(&zsb->z_all_znodes);
@@ -1077,6 +1084,10 @@ zfsvfs_teardown(zfs_sb_t *zsb, boolean_t unmounting)
        return (0);
 }
 
+#ifdef HAVE_BDI
+static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
+#endif /* HAVE_BDI */
+
 int
 zfs_domount(struct super_block *sb, void *data, int silent)
 {
@@ -1102,6 +1113,7 @@ zfs_domount(struct super_block *sb, void *data, int silent)
        sb->s_time_gran = 1;
        sb->s_blocksize = recordsize;
        sb->s_blocksize_bits = ilog2(recordsize);
+       bdi_put_sb(sb, NULL);
 
        /* Set callback operations for the file system. */
        sb->s_op = &zpl_super_operations;
@@ -1126,6 +1138,16 @@ zfs_domount(struct super_block *sb, void *data, int silent)
                dmu_objset_set_user(zsb->z_os, zsb);
                mutex_exit(&zsb->z_os->os_user_ptr_lock);
        } else {
+               /* Disable Linux read-ahead handled by lower layers */
+               zsb->z_bdi.ra_pages = 0;
+
+               error = -bdi_register(&zsb->z_bdi, NULL, "zfs-%d",
+                   atomic_long_inc_return(&bdi_seq));
+               if (error)
+                       goto out;
+
+               bdi_put_sb(sb, &zsb->z_bdi);
+
                error = zfs_sb_setup(zsb, B_TRUE);
 #ifdef HAVE_SNAPSHOT
                (void) zfs_snap_create(zsb);
@@ -1166,6 +1188,11 @@ zfs_umount(struct super_block *sb)
        VERIFY(zfsvfs_teardown(zsb, B_TRUE) == 0);
        os = zsb->z_os;
 
+       if (bdi_get_sb(sb)) {
+               bdi_unregister(bdi_get_sb(sb));
+               bdi_put_sb(sb, NULL);
+       }
+
        /*
         * z_os will be NULL if there was an error in
         * attempting to reopen zsb.

diff --git a/scripts/Makefile.in b/scripts/Makefile.in
index 51dadb4..3e0c8f9 100644 (file)
--- a/scripts/Makefile.in
+++ b/scripts/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/scripts/zpios-profile/Makefile.in b/scripts/zpios-profile/Makefile.in
index 550fab6..cef88fb 100644 (file)
--- a/scripts/zpios-profile/Makefile.in
+++ b/scripts/zpios-profile/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/scripts/zpios-test/Makefile.in b/scripts/zpios-test/Makefile.in
index d862710..8dbaa6b 100644 (file)
--- a/scripts/zpios-test/Makefile.in
+++ b/scripts/zpios-test/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/scripts/zpool-config/Makefile.in b/scripts/zpool-config/Makefile.in
index 530fb23..3a8d836 100644 (file)
--- a/scripts/zpool-config/Makefile.in
+++ b/scripts/zpool-config/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/scripts/zpool-layout/Makefile.in b/scripts/zpool-layout/Makefile.in
index 2a00078..e34d0dc 100644 (file)
--- a/scripts/zpool-layout/Makefile.in
+++ b/scripts/zpool-layout/Makefile.in
@@ -42,6 +42,7 @@ am__aclocal_m4_deps =  \
        $(top_srcdir)/config/always-no-unused-but-set-variable.m4 \
        $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \
        $(top_srcdir)/config/kernel-bdev-logical-size.m4 \
+       $(top_srcdir)/config/kernel-bdi.m4 \
        $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \
        $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \
        $(top_srcdir)/config/kernel-bio-failfast.m4 \

diff --git a/zfs_config.h.in b/zfs_config.h.in
index d244ac3..cf3c25c 100644 (file)
--- a/zfs_config.h.in
+++ b/zfs_config.h.in
@@ -18,6 +18,9 @@
 /* bdev_logical_block_size() is available */
 #undef HAVE_BDEV_LOGICAL_BLOCK_SIZE
 
+/* struct super_block has s_bdi */
+#undef HAVE_BDI
+
 /* bio_empy_barrier() is defined */
 #undef HAVE_BIO_EMPTY_BARRIER