Btrfs: only log the inode item if we can get away with it

Currently we copy all the file information into the log, inode item, the
refs, xattrs etc.  Except most of this doesn't change from fsync to fsync,
just the inode item changes.  So set a flag if an xattr changes or a link is
added, and otherwise only log the inode item.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

4 files changed, 11 insertions, 2 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index ed8ca7ca5eff..2411baf35220 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -39,6 +39,7 @@
 #define BTRFS_INODE_HAS_ORPHAN_ITEM             5
 #define BTRFS_INODE_HAS_ASYNC_EXTENT            6
 #define BTRFS_INODE_NEEDS_FULL_SYNC             7
+#define BTRFS_INODE_COPY_EVERYTHING             8
 
 /* in memory btrfs inode */
 struct btrfs_inode {
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 0446cbe8bcaf..123815f3b454 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5083,6 +5083,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
         inode_inc_iversion(inode);
         inode->i_ctime = CURRENT_TIME;
         ihold(inode);
+        set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
 
         err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index);
 
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 40b9efd20e43..f05fca778cb4 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3429,14 +3429,20 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
         } else {
                 if (test_and_clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
                                        &BTRFS_I(inode)->runtime_flags)) {
+                        clear_bit(BTRFS_INODE_COPY_EVERYTHING,
+                                  &BTRFS_I(inode)->runtime_flags);
                         ret = btrfs_truncate_inode_items(trans, log,
                                                          inode, 0, 0);
                 } else {
                         if (inode_only == LOG_INODE_ALL)
                                 fast_search = true;
-                        max_key.type = BTRFS_XATTR_ITEM_KEY;
+                        if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING,
+                                               &BTRFS_I(inode)->runtime_flags))
+                                max_key.type = BTRFS_XATTR_ITEM_KEY;
+                        else
+                                max_key.type = BTRFS_INODE_ITEM_KEY;
                         ret = drop_objectid_items(trans, log, path, ino,
-                                                  BTRFS_XATTR_ITEM_KEY);
+                                                  max_key.type);
                 }
         }
         if (ret) {
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index aef6bb3c5f5c..446a6848c554 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -208,6 +208,7 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans,
 
         inode_inc_iversion(inode);
         inode->i_ctime = CURRENT_TIME;
+        set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
         ret = btrfs_update_inode(trans, root, inode);
         BUG_ON(ret);
 out: