Tear down and flush the mmap region

The inode eviction should unmap the pages associated with the inode.
These pages should also be flushed to disk to avoid the data loss.
Therefore, use truncate_setsize() in evict_inode() to release the
pagecache.

The API truncate_setsize() was added in 2.6.35 kernel. To ensure
compatibility with the old kernel, the patch defines its own
truncate_setsize function.

Signed-off-by: Prasad Joshi <[email protected]>
Closes #255

8 files changed, 8 insertions, 0 deletions

diff --git a/lib/libspl/include/Makefile.in b/lib/libspl/include/Makefile.in
index f62def9c3..d2d6a7750 100644
--- a/lib/libspl/include/Makefile.in
+++ b/lib/libspl/include/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \
diff --git a/lib/libspl/include/ia32/Makefile.in b/lib/libspl/include/ia32/Makefile.in
index a6dc187a1..5d4a25192 100644
--- a/lib/libspl/include/ia32/Makefile.in
+++ b/lib/libspl/include/ia32/Makefile.in
@@ -64,6 +64,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \
diff --git a/lib/libspl/include/ia32/sys/Makefile.in b/lib/libspl/include/ia32/sys/Makefile.in
index efc701d40..41e404316 100644
--- a/lib/libspl/include/ia32/sys/Makefile.in
+++ b/lib/libspl/include/ia32/sys/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \
diff --git a/lib/libspl/include/rpc/Makefile.in b/lib/libspl/include/rpc/Makefile.in
index 1d2ae8542..78808fe33 100644
--- a/lib/libspl/include/rpc/Makefile.in
+++ b/lib/libspl/include/rpc/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \
diff --git a/lib/libspl/include/sys/Makefile.in b/lib/libspl/include/sys/Makefile.in
index 0e3f9e1b6..fb8b43fb0 100644
--- a/lib/libspl/include/sys/Makefile.in
+++ b/lib/libspl/include/sys/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \
diff --git a/lib/libspl/include/sys/dktp/Makefile.in b/lib/libspl/include/sys/dktp/Makefile.in
index 0c050a346..a5dcc84a4 100644
--- a/lib/libspl/include/sys/dktp/Makefile.in
+++ b/lib/libspl/include/sys/dktp/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \
diff --git a/lib/libspl/include/sys/sysevent/Makefile.in b/lib/libspl/include/sys/sysevent/Makefile.in
index 5fadc4d84..a57bd9c29 100644
--- a/lib/libspl/include/sys/sysevent/Makefile.in
+++ b/lib/libspl/include/sys/sysevent/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \
diff --git a/lib/libspl/include/util/Makefile.in b/lib/libspl/include/util/Makefile.in
index 6e3fd1abd..782827800 100644
--- a/lib/libspl/include/util/Makefile.in
+++ b/lib/libspl/include/util/Makefile.in
@@ -66,6 +66,7 @@ am__aclocal_m4_deps =  \
 	$(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \
 	$(top_srcdir)/config/kernel-rq-for-each_segment.m4 \
 	$(top_srcdir)/config/kernel-rq-is_sync.m4 \
+	$(top_srcdir)/config/kernel-truncate-setsize.m4 \
 	$(top_srcdir)/config/kernel-xattr-handler.m4 \
 	$(top_srcdir)/config/kernel.m4 \
 	$(top_srcdir)/config/user-arch.m4 \