Btrfs: use async helpers for DIO write checksumming
The async helper threads offload crc work onto all the
CPUs, and make streaming writes much faster. This
changes the O_DIRECT write code to use them. The only
small complication was that we need to pass in the
logical offset in the file for each bio, because we can't
find it in the bio's pages.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a8772b5..f3b287c 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -74,6 +74,11 @@
int rw;
int mirror_num;
unsigned long bio_flags;
+ /*
+ * bio_offset is optional, can be used if the pages in the bio
+ * can't tell us where in the file the bio should go
+ */
+ u64 bio_offset;
struct btrfs_work work;
};
@@ -534,7 +539,8 @@
async = container_of(work, struct async_submit_bio, work);
fs_info = BTRFS_I(async->inode)->root->fs_info;
async->submit_bio_start(async->inode, async->rw, async->bio,
- async->mirror_num, async->bio_flags);
+ async->mirror_num, async->bio_flags,
+ async->bio_offset);
}
static void run_one_async_done(struct btrfs_work *work)
@@ -556,7 +562,8 @@
wake_up(&fs_info->async_submit_wait);
async->submit_bio_done(async->inode, async->rw, async->bio,
- async->mirror_num, async->bio_flags);
+ async->mirror_num, async->bio_flags,
+ async->bio_offset);
}
static void run_one_async_free(struct btrfs_work *work)
@@ -570,6 +577,7 @@
int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
int rw, struct bio *bio, int mirror_num,
unsigned long bio_flags,
+ u64 bio_offset,
extent_submit_bio_hook_t *submit_bio_start,
extent_submit_bio_hook_t *submit_bio_done)
{
@@ -592,6 +600,7 @@
async->work.flags = 0;
async->bio_flags = bio_flags;
+ async->bio_offset = bio_offset;
atomic_inc(&fs_info->nr_async_submits);
@@ -627,7 +636,8 @@
static int __btree_submit_bio_start(struct inode *inode, int rw,
struct bio *bio, int mirror_num,
- unsigned long bio_flags)
+ unsigned long bio_flags,
+ u64 bio_offset)
{
/*
* when we're called for a write, we're already in the async
@@ -638,7 +648,8 @@
}
static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
- int mirror_num, unsigned long bio_flags)
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset)
{
/*
* when we're called for a write, we're already in the async
@@ -648,7 +659,8 @@
}
static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
- int mirror_num, unsigned long bio_flags)
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset)
{
int ret;
@@ -671,6 +683,7 @@
*/
return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
inode, rw, bio, mirror_num, 0,
+ bio_offset,
__btree_submit_bio_start,
__btree_submit_bio_done);
}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 2c064eb..88e825a 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -87,7 +87,7 @@
int metadata);
int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
int rw, struct bio *bio, int mirror_num,
- unsigned long bio_flags,
+ unsigned long bio_flags, u64 bio_offset,
extent_submit_bio_hook_t *submit_bio_start,
extent_submit_bio_hook_t *submit_bio_done);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a53aca3..15392af 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1913,7 +1913,7 @@
if (tree->ops && tree->ops->submit_bio_hook)
tree->ops->submit_bio_hook(page->mapping->host, rw, bio,
- mirror_num, bio_flags);
+ mirror_num, bio_flags, start);
else
submit_bio(rw, bio);
if (bio_flagged(bio, BIO_EOPNOTSUPP))
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 86f10dc7..86c7b34 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -49,7 +49,7 @@
typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
struct bio *bio, int mirror_num,
- unsigned long bio_flags);
+ unsigned long bio_flags, u64 bio_offset);
struct extent_io_ops {
int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
u64 start, u64 end, int *page_started,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1695440..13a4aa2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1385,7 +1385,8 @@
*/
static int __btrfs_submit_bio_start(struct inode *inode, int rw,
struct bio *bio, int mirror_num,
- unsigned long bio_flags)
+ unsigned long bio_flags,
+ u64 bio_offset)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = 0;
@@ -1404,7 +1405,8 @@
* are inserted into the btree
*/
static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
- int mirror_num, unsigned long bio_flags)
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
return btrfs_map_bio(root, rw, bio, mirror_num, 1);
@@ -1415,7 +1417,8 @@
* on write, or reading the csums from the tree before a read
*/
static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
- int mirror_num, unsigned long bio_flags)
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
int ret = 0;
@@ -1440,7 +1443,8 @@
/* we're doing a write, do the async checksumming */
return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
inode, rw, bio, mirror_num,
- bio_flags, __btrfs_submit_bio_start,
+ bio_flags, bio_offset,
+ __btrfs_submit_bio_start,
__btrfs_submit_bio_done);
}
@@ -1844,7 +1848,7 @@
BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
failrec->last_mirror,
- failrec->bio_flags);
+ failrec->bio_flags, 0);
return 0;
}
@@ -5484,6 +5488,17 @@
dio_end_io(bio, err);
}
+static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw,
+ struct bio *bio, int mirror_num,
+ unsigned long bio_flags, u64 offset)
+{
+ int ret;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ ret = btrfs_csum_one_bio(root, inode, bio, offset, 1);
+ BUG_ON(ret);
+ return 0;
+}
+
static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
loff_t file_offset)
{
@@ -5535,13 +5550,20 @@
if (ret)
goto out_err;
- if (write && !skip_sum)
- btrfs_csum_one_bio(root, inode, bio, dip->logical_offset, 1);
- else if (!skip_sum)
+ if (write && !skip_sum) {
+ ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
+ inode, rw, bio, 0, 0,
+ dip->logical_offset,
+ __btrfs_submit_bio_start_direct_io,
+ __btrfs_submit_bio_done);
+ if (ret)
+ goto out_err;
+ return;
+ } else if (!skip_sum)
btrfs_lookup_bio_sums_dio(root, inode, bio,
dip->logical_offset, dip->csums);
- ret = btrfs_map_bio(root, rw, bio, 0, 0);
+ ret = btrfs_map_bio(root, rw, bio, 0, 1);
if (ret)
goto out_err;
return;
