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Simplify BDI integration

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Update the code to use the bdi_setup_and_register() helper to
simplify the bdi integration code.  The updated code now just
registers the bdi during mount and destroys it during unmount.

The only complication is that for 2.6.32 - 2.6.33 kernels the
helper wasn't available so in these cases the zfs code must
provide it.  Luckily the bdi_setup_and_register() function
is trivial.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #367
This commit is contained in:
Brian Behlendorf
2011-11-07 16:39:03 -08:00
parent 591fb62f19
commit 5547c2f1bf
60 changed files with 231 additions and 41 deletions
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config/kernel-bdi-setup-and-register.m4
+15
View File
@@ -0,0 +1,15 @@
dnl #
dnl # 2.6.34 API change
dnl # The bdi_setup_and_register() helper function is avilable and
dnl # exported by the kernel. This is a trivial helper function but
dnl # using it significantly simplifies the code surrounding setting
dnl # up and tearing down the bdi structure.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER], [
ZFS_CHECK_SYMBOL_EXPORT(
[bdi_setup_and_register],
[mm/backing-dev.c],
[AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,
[bdi_setup_and_register() is available])],
[])
])
config/kernel.m4
+1
View File
@@ -41,6 +41,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
ZFS_AC_KERNEL_MOUNT_NODEV
ZFS_AC_KERNEL_BDI
ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"