From facc8a2247340a9735fe8cc123c5da2102f5ef1b Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Thu, 25 Jul 2013 19:22:34 +0800 Subject: Btrfs: don't cache the csum value into the extent state tree Before applying this patch, we cached the csum value into the extent state tree when reading some data from the disk, this operation increased the lock contention of the state tree. Now, we just store the csum value into the bio structure or other unshared structure, so we can reduce the lock contention. Signed-off-by: Miao Xie Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/btrfs_inode.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'fs/btrfs/btrfs_inode.h') diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index 08b286b2a2c5..d0ae226926ee 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -218,6 +218,27 @@ static inline int btrfs_inode_in_log(struct inode *inode, u64 generation) return 0; } +struct btrfs_dio_private { + struct inode *inode; + u64 logical_offset; + u64 disk_bytenr; + u64 bytes; + void *private; + + /* number of bios pending for this dio */ + atomic_t pending_bios; + + /* IO errors */ + int errors; + + /* orig_bio is our btrfs_io_bio */ + struct bio *orig_bio; + + /* dio_bio came from fs/direct-io.c */ + struct bio *dio_bio; + u8 csum[0]; +}; + /* * Disable DIO read nolock optimization, so new dio readers will be forced * to grab i_mutex. It is used to avoid the endless truncate due to -- cgit v1.2.1