Implementation btrfs .metadata_readahead. In btrfs, all metadata pages are in a
special btree_inode. We do readahead in it.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
---
fs/btrfs/disk-io.c | 10 ++++++++++
fs/btrfs/super.c | 1 +
fs/btrfs/volumes.c | 38 ++++++++++++++++++++++++++++++++++++++
fs/btrfs/volumes.h | 2 ++
mm/readahead.c | 1 +
5 files changed, 52 insertions(+)
Index: linux/fs/btrfs/disk-io.c
===================================================================
--- linux.orig/fs/btrfs/disk-io.c 2010-12-31 08:52:00.000000000 +0800
+++ linux/fs/btrfs/disk-io.c 2011-01-03 21:16:12.000000000 +0800
@@ -774,6 +774,15 @@ static int btree_readpage(struct file *f
return extent_read_full_page(tree, page, btree_get_extent);
}
+static int btree_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(mapping->host)->io_tree;
+ return extent_readpages(tree, mapping, pages, nr_pages,
+ btree_get_extent);
+}
+
static int btree_releasepage(struct page *page, gfp_t gfp_flags)
{
struct extent_io_tree *tree;
@@ -817,6 +826,7 @@ static void btree_invalidatepage(struct
static const struct address_space_operations btree_aops = {
.readpage = btree_readpage,
+ .readpages = btree_readpages,
.writepage = btree_writepage,
.writepages = btree_writepages,
.releasepage = btree_releasepage,
Index: linux/fs/btrfs/super.c
===================================================================
--- linux.orig/fs/btrfs/super.c 2011-01-03 21:16:00.000000000 +0800
+++ linux/fs/btrfs/super.c 2011-01-03 21:16:12.000000000 +0800
@@ -922,6 +922,7 @@ static const struct super_operations btr
.freeze_fs = btrfs_freeze,
.unfreeze_fs = btrfs_unfreeze,
.metadata_incore = btrfs_metadata_incore,
+ .metadata_readahead = btrfs_metadata_readahead,
};
static const struct file_operations btrfs_ctl_fops = {
Index: ...
