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f2d8d74d
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f2d8d74d
编写于
4月 21, 2008
作者:
C
Chris Mason
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Btrfs: Make an unplug function that doesn't unplug every spindle
Signed-off-by:
N
Chris Mason
<
chris.mason@oracle.com
>
上级
4ef64eae
变更
4
隐藏空白更改
内联
并排
Showing
4 changed file
with
75 addition
and
38 deletion
+75
-38
fs/btrfs/disk-io.c
fs/btrfs/disk-io.c
+15
-11
fs/btrfs/inode.c
fs/btrfs/inode.c
+1
-5
fs/btrfs/volumes.c
fs/btrfs/volumes.c
+57
-22
fs/btrfs/volumes.h
fs/btrfs/volumes.h
+2
-0
未找到文件。
fs/btrfs/disk-io.c
浏览文件 @
f2d8d74d
...
...
@@ -913,18 +913,22 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
void
btrfs_unplug_io_fn
(
struct
backing_dev_info
*
bdi
,
struct
page
*
page
)
{
struct
list_head
*
cur
;
struct
btrfs_device
*
device
;
struct
btrfs_fs_info
*
info
;
struct
inode
*
inode
=
page
->
mapping
->
host
;
struct
extent_map_tree
*
em_tree
;
struct
extent_map
*
em
;
u64
offset
=
page_offset
(
page
);
info
=
(
struct
btrfs_fs_info
*
)
bdi
->
unplug_io_data
;
list_for_each
(
cur
,
&
info
->
fs_devices
->
devices
)
{
device
=
list_entry
(
cur
,
struct
btrfs_device
,
dev_list
);
bdi
=
blk_get_backing_dev_info
(
device
->
bdev
);
if
(
bdi
->
unplug_io_fn
)
{
bdi
->
unplug_io_fn
(
bdi
,
page
);
}
}
em_tree
=
&
BTRFS_I
(
inode
)
->
extent_tree
;
spin_lock
(
&
em_tree
->
lock
);
em
=
lookup_extent_mapping
(
em_tree
,
offset
,
PAGE_CACHE_SIZE
);
spin_unlock
(
&
em_tree
->
lock
);
if
(
!
em
)
return
;
offset
=
offset
-
em
->
start
;
btrfs_unplug_page
(
&
BTRFS_I
(
inode
)
->
root
->
fs_info
->
mapping_tree
,
em
->
block_start
+
offset
,
page
);
free_extent_map
(
em
);
}
static
int
setup_bdi
(
struct
btrfs_fs_info
*
info
,
struct
backing_dev_info
*
bdi
)
...
...
fs/btrfs/inode.c
浏览文件 @
f2d8d74d
...
...
@@ -313,13 +313,9 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
u64
logical
=
bio
->
bi_sector
<<
9
;
u64
length
=
0
;
u64
map_length
;
struct
bio_vec
*
bvec
;
int
i
;
int
ret
;
bio_for_each_segment
(
bvec
,
bio
,
i
)
{
length
+=
bvec
->
bv_len
;
}
length
=
bio
->
bi_size
;
map_tree
=
&
root
->
fs_info
->
mapping_tree
;
map_length
=
length
;
ret
=
btrfs_map_block
(
map_tree
,
READ
,
logical
,
...
...
fs/btrfs/volumes.c
浏览文件 @
f2d8d74d
...
...
@@ -18,6 +18,7 @@
#include <linux/sched.h>
#include <linux/bio.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <asm/div64.h>
#include "ctree.h"
#include "extent_map.h"
...
...
@@ -930,9 +931,10 @@ int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len)
return
ret
;
}
int
btrfs_map_block
(
struct
btrfs_mapping_tree
*
map_tree
,
int
rw
,
u64
logical
,
u64
*
length
,
struct
btrfs_multi_bio
**
multi_ret
,
int
mirror_num
)
static
int
__btrfs_map_block
(
struct
btrfs_mapping_tree
*
map_tree
,
int
rw
,
u64
logical
,
u64
*
length
,
struct
btrfs_multi_bio
**
multi_ret
,
int
mirror_num
,
struct
page
*
unplug_page
)
{
struct
extent_map
*
em
;
struct
map_lookup
*
map
;
...
...
@@ -944,6 +946,7 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
int
stripes_required
=
1
;
int
stripe_index
;
int
i
;
int
num_stripes
;
struct
btrfs_multi_bio
*
multi
=
NULL
;
if
(
multi_ret
&&
!
(
rw
&
(
1
<<
BIO_RW
)))
{
...
...
@@ -960,10 +963,14 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
spin_lock
(
&
em_tree
->
lock
);
em
=
lookup_extent_mapping
(
em_tree
,
logical
,
*
length
);
spin_unlock
(
&
em_tree
->
lock
);
if
(
!
em
&&
unplug_page
)
return
0
;
if
(
!
em
)
{
printk
(
"unable to find logical %Lu
\n
"
,
logical
);
BUG
();
}
BUG_ON
(
!
em
);
BUG_ON
(
em
->
start
>
logical
||
em
->
start
+
em
->
len
<
logical
);
map
=
(
struct
map_lookup
*
)
em
->
bdev
;
...
...
@@ -1010,14 +1017,15 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
}
else
{
*
length
=
em
->
len
-
offset
;
}
if
(
!
multi_ret
)
if
(
!
multi_ret
&&
!
unplug_page
)
goto
out
;
multi
->
num_stripes
=
1
;
num_stripes
=
1
;
stripe_index
=
0
;
if
(
map
->
type
&
BTRFS_BLOCK_GROUP_RAID1
)
{
if
(
rw
&
(
1
<<
BIO_RW
))
multi
->
num_stripes
=
map
->
num_stripes
;
if
(
unplug_page
||
(
rw
&
(
1
<<
BIO_RW
)
))
num_stripes
=
map
->
num_stripes
;
else
if
(
mirror_num
)
{
stripe_index
=
mirror_num
-
1
;
}
else
{
...
...
@@ -1037,7 +1045,7 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
}
}
else
if
(
map
->
type
&
BTRFS_BLOCK_GROUP_DUP
)
{
if
(
rw
&
(
1
<<
BIO_RW
))
multi
->
num_stripes
=
map
->
num_stripes
;
num_stripes
=
map
->
num_stripes
;
else
if
(
mirror_num
)
stripe_index
=
mirror_num
-
1
;
}
else
if
(
map
->
type
&
BTRFS_BLOCK_GROUP_RAID10
)
{
...
...
@@ -1047,8 +1055,8 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
stripe_index
=
do_div
(
stripe_nr
,
factor
);
stripe_index
*=
map
->
sub_stripes
;
if
(
rw
&
(
1
<<
BIO_RW
))
multi
->
num_stripes
=
map
->
sub_stripes
;
if
(
unplug_page
||
(
rw
&
(
1
<<
BIO_RW
)
))
num_stripes
=
map
->
sub_stripes
;
else
if
(
mirror_num
)
stripe_index
+=
mirror_num
-
1
;
else
...
...
@@ -1063,19 +1071,50 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
}
BUG_ON
(
stripe_index
>=
map
->
num_stripes
);
for
(
i
=
0
;
i
<
multi
->
num_stripes
;
i
++
)
{
multi
->
stripes
[
i
].
physical
=
map
->
stripes
[
stripe_index
].
physical
+
stripe_offset
+
stripe_nr
*
map
->
stripe_len
;
multi
->
stripes
[
i
].
dev
=
map
->
stripes
[
stripe_index
].
dev
;
for
(
i
=
0
;
i
<
num_stripes
;
i
++
)
{
if
(
unplug_page
)
{
struct
btrfs_device
*
device
;
struct
backing_dev_info
*
bdi
;
device
=
map
->
stripes
[
stripe_index
].
dev
;
bdi
=
blk_get_backing_dev_info
(
device
->
bdev
);
if
(
bdi
->
unplug_io_fn
)
{
bdi
->
unplug_io_fn
(
bdi
,
unplug_page
);
}
}
else
{
multi
->
stripes
[
i
].
physical
=
map
->
stripes
[
stripe_index
].
physical
+
stripe_offset
+
stripe_nr
*
map
->
stripe_len
;
multi
->
stripes
[
i
].
dev
=
map
->
stripes
[
stripe_index
].
dev
;
}
stripe_index
++
;
}
*
multi_ret
=
multi
;
if
(
multi_ret
)
{
*
multi_ret
=
multi
;
multi
->
num_stripes
=
num_stripes
;
}
out:
free_extent_map
(
em
);
return
0
;
}
int
btrfs_map_block
(
struct
btrfs_mapping_tree
*
map_tree
,
int
rw
,
u64
logical
,
u64
*
length
,
struct
btrfs_multi_bio
**
multi_ret
,
int
mirror_num
)
{
return
__btrfs_map_block
(
map_tree
,
rw
,
logical
,
length
,
multi_ret
,
mirror_num
,
NULL
);
}
int
btrfs_unplug_page
(
struct
btrfs_mapping_tree
*
map_tree
,
u64
logical
,
struct
page
*
page
)
{
u64
length
=
PAGE_CACHE_SIZE
;
return
__btrfs_map_block
(
map_tree
,
READ
,
logical
,
&
length
,
NULL
,
0
,
page
);
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
static
void
end_bio_multi_stripe
(
struct
bio
*
bio
,
int
err
)
#else
...
...
@@ -1122,16 +1161,12 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
u64
logical
=
bio
->
bi_sector
<<
9
;
u64
length
=
0
;
u64
map_length
;
struct
bio_vec
*
bvec
;
struct
btrfs_multi_bio
*
multi
=
NULL
;
int
i
;
int
ret
;
int
dev_nr
=
0
;
int
total_devs
=
1
;
bio_for_each_segment
(
bvec
,
bio
,
i
)
{
length
+=
bvec
->
bv_len
;
}
length
=
bio
->
bi_size
;
map_tree
=
&
root
->
fs_info
->
mapping_tree
;
map_length
=
length
;
...
...
fs/btrfs/volumes.h
浏览文件 @
f2d8d74d
...
...
@@ -119,4 +119,6 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
struct
btrfs_device
*
device
);
int
btrfs_cleanup_fs_uuids
(
void
);
int
btrfs_num_copies
(
struct
btrfs_mapping_tree
*
map_tree
,
u64
logical
,
u64
len
);
int
btrfs_unplug_page
(
struct
btrfs_mapping_tree
*
map_tree
,
u64
logical
,
struct
page
*
page
);
#endif
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