Btrfs: cache the extent state everywhere we possibly can V2

This patch just goes through and fixes everybody that does

lock_extent()
blah
unlock_extent()

to use

lock_extent_bits()
blah
unlock_extent_cached()

and pass around a extent_state so we only have to do the searches once per
function.  This gives me about a 3 mb/s boots on my random write test.  I have
not converted some things, like the relocation and ioctl's, since they aren't
heavily used and the relocation stuff is in the middle of being re-written.  I
also changed the clear_extent_bit() to only unset the cached state if we are
clearing EXTENT_LOCKED and related stuff, so we can do things like this

lock_extent_bits()
clear delalloc bits
unlock_extent_cached()

without losing our cached state.  I tested this thoroughly and turned on
LEAK_DEBUG to make sure we weren't leaking extent states, everything worked out
fine.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 559f724..1727b26 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6561,6 +6561,7 @@ static noinline int invalidate_extent_cache(struct btrfs_root *root,
 	struct btrfs_key key;
 	struct inode *inode = NULL;
 	struct btrfs_file_extent_item *fi;
+	struct extent_state *cached_state = NULL;
 	u64 num_bytes;
 	u64 skip_objectid = 0;
 	u32 nritems;
@@ -6589,12 +6590,14 @@ static noinline int invalidate_extent_cache(struct btrfs_root *root,
 		}
 		num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
 
-		lock_extent(&BTRFS_I(inode)->io_tree, key.offset,
-			    key.offset + num_bytes - 1, GFP_NOFS);
+		lock_extent_bits(&BTRFS_I(inode)->io_tree, key.offset,
+				 key.offset + num_bytes - 1, 0, &cached_state,
+				 GFP_NOFS);
 		btrfs_drop_extent_cache(inode, key.offset,
 					key.offset + num_bytes - 1, 1);
-		unlock_extent(&BTRFS_I(inode)->io_tree, key.offset,
-			      key.offset + num_bytes - 1, GFP_NOFS);
+		unlock_extent_cached(&BTRFS_I(inode)->io_tree, key.offset,
+				     key.offset + num_bytes - 1, &cached_state,
+				     GFP_NOFS);
 		cond_resched();
 	}
 	iput(inode);