[PATCH 18/19] c/r: add generic '->checkpoint' f_op to ext fses

[Dan Smith <danms@us.ibm.com>]

From: Dave Hansen <dave@linux.vnet.ibm.com>

This marks ext[234] as being checkpointable.  There will be many
more to do this to, but this is a start.

Changelog[ckpt-v21]:
  - Put file_ops->checkpoint under CONFIG_CHECKPOINT
Changelog[ckpt-v19-rc3]:
  - Rebase to kernel 2.6.33 (ext2)
Changelog[v1]:
  - [Serge Hallyn] Use filemap_checkpoint() in ext4_file_vm_ops

Cc: linux-ext4@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Tested-by: Serge E. Hallyn <serue@us.ibm.com>
---
 fs/ext2/dir.c  |    3 +++
 fs/ext2/file.c |    6 ++++++
 fs/ext3/dir.c  |    3 +++
 fs/ext3/file.c |    3 +++
 fs/ext4/dir.c  |    3 +++
 fs/ext4/file.c |    6 ++++++
 6 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 2709b34..7aefb74 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -721,4 +721,7 @@ const struct file_operations ext2_dir_operations = {
 	.compat_ioctl	= ext2_compat_ioctl,
 #endif
 	.fsync		= ext2_fsync,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif
 };
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 49eec94..c8991c8 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -76,6 +76,9 @@ const struct file_operations ext2_file_operations = {
 	.fsync		= ext2_fsync,
 	.splice_read	= generic_file_splice_read,
 	.splice_write	= generic_file_splice_write,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif /* CONFIG_CHECKPOINT */
 };
 
 #ifdef CONFIG_EXT2_FS_XIP
@@ -91,6 +94,9 @@ const struct file_operations ext2_xip_file_operations = {
 	.open		= dquot_file_open,
 	.release	= ext2_release_file,
 	.fsync		= ext2_fsync,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif /* CONFIG_CHECKPOINT */
 };
 #endif
 
diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c
index e2e72c3..e2f5948 100644
--- a/fs/ext3/dir.c
+++ b/fs/ext3/dir.c
@@ -48,6 +48,9 @@ const struct file_operations ext3_dir_operations = {
 #endif
 	.fsync		= ext3_sync_file,	/* BKL held */
 	.release	= ext3_release_dir,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif
 };
 
 
diff --git a/fs/ext3/file.c b/fs/ext3/file.c
index f55df0e..2cf4ef2 100644
--- a/fs/ext3/file.c
+++ b/fs/ext3/file.c
@@ -68,6 +68,9 @@ const struct file_operations ext3_file_operations = {
 	.fsync		= ext3_sync_file,
 	.splice_read	= generic_file_splice_read,
 	.splice_write	= generic_file_splice_write,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif
 };
 
 const struct inode_operations ext3_file_inode_operations = {
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index ece76fb..0101873 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -48,6 +48,9 @@ const struct file_operations ext4_dir_operations = {
 #endif
 	.fsync		= ext4_sync_file,
 	.release	= ext4_release_dir,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif
 };
 
 
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 5a5c55d..142dde6 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -86,6 +86,9 @@ ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
 static const struct vm_operations_struct ext4_file_vm_ops = {
 	.fault		= filemap_fault,
 	.page_mkwrite   = ext4_page_mkwrite,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= filemap_checkpoint,
+#endif
 };
 
 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
@@ -188,6 +191,9 @@ const struct file_operations ext4_file_operations = {
 	.fsync		= ext4_sync_file,
 	.splice_read	= generic_file_splice_read,
 	.splice_write	= generic_file_splice_write,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif
 };
 
 const struct inode_operations ext4_file_inode_operations = {
-- 
1.7.2.2