btrfs: expand cow_file_range() to support in-band dedup and subpage-blocksize

Extract cow_file_range() new parameters for both in-band dedupe and
subpage sector size patchset.

This should make conflict of both patchset to minimal, and reduce the
effort needed to rebase them.

Cc: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/dedupe.h b/fs/btrfs/dedupe.h
new file mode 100644 (file)
index 0000000..83ebfe2
--- /dev/null
+++ b/fs/btrfs/dedupe.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2016 Fujitsu.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __BTRFS_DEDUPE__
+#define __BTRFS_DEDUPE__
+
+/* later in-band dedupe will expand this struct */
+struct btrfs_dedupe_hash;
+#endif

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index be85464..0612231 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -60,6 +60,7 @@
 #include "hash.h"
 #include "props.h"
 #include "qgroup.h"
+#include "dedupe.h"
 
 struct btrfs_iget_args {
        struct btrfs_key *location;
@@ -105,8 +106,9 @@ static int btrfs_truncate(struct inode *inode);
 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);
 static noinline int cow_file_range(struct inode *inode,
                                   struct page *locked_page,
-                                  u64 start, u64 end, int *page_started,
-                                  unsigned long *nr_written, int unlock);
+                                  u64 start, u64 end, u64 delalloc_end,
+                                  int *page_started, unsigned long *nr_written,
+                                  int unlock, struct btrfs_dedupe_hash *hash);
 static struct extent_map *create_pinned_em(struct inode *inode, u64 start,
                                           u64 len, u64 orig_start,
                                           u64 block_start, u64 block_len,
@@ -710,7 +712,10 @@ retry:
                                             async_extent->start,
                                             async_extent->start +
                                             async_extent->ram_size - 1,
-                                            &page_started, &nr_written, 0);
+                                            async_extent->start +
+                                            async_extent->ram_size - 1,
+                                            &page_started, &nr_written, 0,
+                                            NULL);
 
                        /* JDM XXX */
 
@@ -923,9 +928,9 @@ static u64 get_extent_allocation_hint(struct inode *inode, u64 start,
  */
 static noinline int cow_file_range(struct inode *inode,
                                   struct page *locked_page,
-                                  u64 start, u64 end, int *page_started,
-                                  unsigned long *nr_written,
-                                  int unlock)
+                                  u64 start, u64 end, u64 delalloc_end,
+                                  int *page_started, unsigned long *nr_written,
+                                  int unlock, struct btrfs_dedupe_hash *hash)
 {
        struct btrfs_root *root = BTRFS_I(inode)->root;
        u64 alloc_hint = 0;
@@ -1416,7 +1421,8 @@ out_check:
                if (cow_start != (u64)-1) {
                        ret = cow_file_range(inode, locked_page,
                                             cow_start, found_key.offset - 1,
-                                            page_started, nr_written, 1);
+                                            end, page_started, nr_written, 1,
+                                            NULL);
                        if (ret) {
                                if (!nolock && nocow)
                                        btrfs_end_write_no_snapshoting(root);
@@ -1499,8 +1505,8 @@ out_check:
        }
 
        if (cow_start != (u64)-1) {
-               ret = cow_file_range(inode, locked_page, cow_start, end,
-                                    page_started, nr_written, 1);
+               ret = cow_file_range(inode, locked_page, cow_start, end, end,
+                                    page_started, nr_written, 1, NULL);
                if (ret)
                        goto error;
        }
@@ -1559,8 +1565,8 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
                ret = run_delalloc_nocow(inode, locked_page, start, end,
                                         page_started, 0, nr_written);
        } else if (!inode_need_compress(inode)) {
-               ret = cow_file_range(inode, locked_page, start, end,
-                                     page_started, nr_written, 1);
+               ret = cow_file_range(inode, locked_page, start, end, end,
+                                     page_started, nr_written, 1, NULL);
        } else {
                set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
                        &BTRFS_I(inode)->runtime_flags);