From 5a1a3df1f6c86926cfe8657e6f9b4b4c2f467d60 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Tue, 2 Feb 2010 20:51:14 +0000 Subject: [PATCH] Btrfs: cache ordered extent when completing io When finishing io we run btrfs_dec_test_ordered_pending, and then immediately run btrfs_lookup_ordered_extent, but btrfs_dec_test_ordered_pending does that already, so we're searching twice when we don't have to. This patch lets us pass a btrfs_ordered_extent in to btrfs_dec_test_ordered_pending so if we do complete io on that ordered extent we can just use the one we found then instead of having to do another btrfs_lookup_ordered_extent. This made my fio job with the other patch go from 24 mb/s to 29 mb/s. Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 5 ++--- fs/btrfs/ordered-data.c | 7 ++++++- fs/btrfs/ordered-data.h | 3 ++- 3 files changed, 10 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 50ce8840a99b..1824dda1d351 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1698,11 +1698,10 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) int compressed = 0; int ret; - ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1); + ret = btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, + end - start + 1); if (!ret) return 0; - - ordered_extent = btrfs_lookup_ordered_extent(inode, start); BUG_ON(!ordered_extent); if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index d56f732ba95e..a8ffecd0b491 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -232,11 +232,12 @@ int btrfs_add_ordered_sum(struct inode *inode, * to make sure this function only returns 1 once for a given ordered extent. */ int btrfs_dec_test_ordered_pending(struct inode *inode, + struct btrfs_ordered_extent **cached, u64 file_offset, u64 io_size) { struct btrfs_ordered_inode_tree *tree; struct rb_node *node; - struct btrfs_ordered_extent *entry; + struct btrfs_ordered_extent *entry = NULL; int ret; tree = &BTRFS_I(inode)->ordered_tree; @@ -264,6 +265,10 @@ int btrfs_dec_test_ordered_pending(struct inode *inode, else ret = 1; out: + if (!ret && cached && entry) { + *cached = entry; + atomic_inc(&entry->refs); + } spin_unlock(&tree->lock); return ret == 0; } diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h index bfbcebbb0adc..c82f76a9f040 100644 --- a/fs/btrfs/ordered-data.h +++ b/fs/btrfs/ordered-data.h @@ -137,7 +137,8 @@ int btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry); int btrfs_remove_ordered_extent(struct inode *inode, struct btrfs_ordered_extent *entry); int btrfs_dec_test_ordered_pending(struct inode *inode, - u64 file_offset, u64 io_size); + struct btrfs_ordered_extent **cached, + u64 file_offset, u64 io_size); int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, u64 start, u64 len, u64 disk_len, int tyep); int btrfs_add_ordered_sum(struct inode *inode, -- 2.34.1