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体验新版 GitCode,发现更多精彩内容 >>
提交
75dfe396
编写于
3月 29, 2007
作者:
C
Chris Mason
提交者:
David Woodhouse
3月 29, 2007
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
btrfs_file_write -- first pass
Signed-off-by:
N
Chris Mason
<
chris.mason@oracle.com
>
上级
30ae8467
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
213 addition
and
9 deletion
+213
-9
fs/btrfs/super.c
fs/btrfs/super.c
+213
-9
未找到文件。
fs/btrfs/super.c
浏览文件 @
75dfe396
...
...
@@ -9,6 +9,8 @@
#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
#include <linux/mpage.h>
#include <linux/swap.h>
#include <linux/writeback.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
...
...
@@ -755,7 +757,7 @@ printk("btrfs sync_fs\n");
return
0
;
}
static
int
btrfs_get_block
(
struct
inode
*
inode
,
sector_t
iblock
,
static
int
btrfs_get_block
_lock
(
struct
inode
*
inode
,
sector_t
iblock
,
struct
buffer_head
*
result
,
int
create
)
{
int
ret
;
...
...
@@ -772,7 +774,6 @@ static int btrfs_get_block(struct inode *inode, sector_t iblock,
struct
btrfs_disk_key
*
found_key
;
btrfs_init_path
(
&
path
);
mutex_lock
(
&
root
->
fs_info
->
fs_mutex
);
if
(
create
)
trans
=
btrfs_start_transaction
(
root
,
1
);
...
...
@@ -848,6 +849,16 @@ static int btrfs_get_block(struct inode *inode, sector_t iblock,
out:
if
(
trans
)
btrfs_end_transaction
(
trans
,
root
);
return
err
;
}
static
int
btrfs_get_block
(
struct
inode
*
inode
,
sector_t
iblock
,
struct
buffer_head
*
result
,
int
create
)
{
int
err
;
struct
btrfs_root
*
root
=
btrfs_sb
(
inode
->
i_sb
);
mutex_lock
(
&
root
->
fs_info
->
fs_mutex
);
err
=
btrfs_get_block_lock
(
inode
,
iblock
,
result
,
create
);
mutex_unlock
(
&
root
->
fs_info
->
fs_mutex
);
return
err
;
}
...
...
@@ -855,8 +866,15 @@ static int btrfs_get_block(struct inode *inode, sector_t iblock,
static
int
btrfs_prepare_write
(
struct
file
*
file
,
struct
page
*
page
,
unsigned
from
,
unsigned
to
)
{
WARN_ON
(
1
);
return
nobh_prepare_write
(
page
,
from
,
to
,
btrfs_get_block
);
}
static
int
btrfs_commit_write
(
struct
file
*
file
,
struct
page
*
page
,
unsigned
from
,
unsigned
to
)
{
WARN_ON
(
1
);
return
nobh_commit_write
(
file
,
page
,
from
,
to
);
}
static
void
btrfs_write_super
(
struct
super_block
*
sb
)
{
...
...
@@ -903,6 +921,196 @@ static void btrfs_truncate(struct inode *inode)
mark_inode_dirty
(
inode
);
}
static
int
btrfs_copy_from_user
(
loff_t
pos
,
int
num_pages
,
int
write_bytes
,
struct
page
**
prepared_pages
,
const
char
__user
*
buf
)
{
long
page_fault
=
0
;
int
i
;
int
offset
=
pos
&
(
PAGE_CACHE_SIZE
-
1
);
for
(
i
=
0
;
i
<
num_pages
&&
write_bytes
>
0
;
i
++
,
offset
=
0
)
{
size_t
count
=
min_t
(
size_t
,
PAGE_CACHE_SIZE
-
offset
,
write_bytes
);
struct
page
*
page
=
prepared_pages
[
i
];
fault_in_pages_readable
(
buf
,
count
);
/* Copy data from userspace to the current page */
kmap
(
page
);
page_fault
=
__copy_from_user
(
page_address
(
page
)
+
offset
,
buf
,
count
);
/* Flush processor's dcache for this page */
flush_dcache_page
(
page
);
kunmap
(
page
);
buf
+=
count
;
write_bytes
-=
count
;
if
(
page_fault
)
break
;
}
return
page_fault
?
-
EFAULT
:
0
;
}
static
void
btrfs_drop_pages
(
struct
page
**
pages
,
size_t
num_pages
)
{
size_t
i
;
for
(
i
=
0
;
i
<
num_pages
;
i
++
)
{
if
(
!
pages
[
i
])
break
;
unlock_page
(
pages
[
i
]);
mark_page_accessed
(
pages
[
i
]);
page_cache_release
(
pages
[
i
]);
}
}
static
int
dirty_and_release_pages
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
file
*
file
,
struct
page
**
pages
,
size_t
num_pages
,
loff_t
pos
,
size_t
write_bytes
)
{
int
i
;
int
offset
;
int
err
=
0
;
int
ret
;
int
this_write
;
for
(
i
=
0
;
i
<
num_pages
;
i
++
)
{
offset
=
pos
&
(
PAGE_CACHE_SIZE
-
1
);
this_write
=
min
(
PAGE_CACHE_SIZE
-
offset
,
write_bytes
);
ret
=
nobh_commit_write
(
file
,
pages
[
i
],
offset
,
offset
+
this_write
);
pos
+=
this_write
;
if
(
ret
)
{
err
=
ret
;
goto
failed
;
}
WARN_ON
(
this_write
>
write_bytes
);
write_bytes
-=
this_write
;
}
failed:
return
err
;
}
static
int
prepare_pages
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
file
*
file
,
struct
page
**
pages
,
size_t
num_pages
,
loff_t
pos
,
size_t
write_bytes
)
{
int
i
;
unsigned
long
index
=
pos
>>
PAGE_CACHE_SHIFT
;
struct
inode
*
inode
=
file
->
f_path
.
dentry
->
d_inode
;
int
offset
;
int
err
=
0
;
int
ret
;
int
this_write
;
loff_t
isize
=
i_size_read
(
inode
);
memset
(
pages
,
0
,
num_pages
*
sizeof
(
struct
page
*
));
for
(
i
=
0
;
i
<
num_pages
;
i
++
)
{
pages
[
i
]
=
grab_cache_page
(
inode
->
i_mapping
,
index
+
i
);
if
(
!
pages
[
i
])
{
err
=
-
ENOMEM
;
goto
failed_release
;
}
offset
=
pos
&
(
PAGE_CACHE_SIZE
-
1
);
this_write
=
min
(
PAGE_CACHE_SIZE
-
offset
,
write_bytes
);
ret
=
nobh_prepare_write
(
pages
[
i
],
offset
,
offset
+
this_write
,
btrfs_get_block_lock
);
pos
+=
this_write
;
if
(
ret
)
{
err
=
ret
;
goto
failed_truncate
;
}
WARN_ON
(
this_write
>
write_bytes
);
write_bytes
-=
this_write
;
}
return
0
;
failed_release:
btrfs_drop_pages
(
pages
,
num_pages
);
return
err
;
failed_truncate:
btrfs_drop_pages
(
pages
,
num_pages
);
if
(
pos
>
isize
)
vmtruncate
(
inode
,
isize
);
return
err
;
}
static
ssize_t
btrfs_file_write
(
struct
file
*
file
,
const
char
__user
*
buf
,
size_t
count
,
loff_t
*
ppos
)
{
loff_t
pos
;
size_t
num_written
=
0
;
int
err
=
0
;
int
ret
=
0
;
struct
btrfs_trans_handle
*
trans
;
struct
inode
*
inode
=
file
->
f_path
.
dentry
->
d_inode
;
struct
btrfs_root
*
root
=
btrfs_sb
(
inode
->
i_sb
);
struct
page
*
pages
[
1
];
if
(
file
->
f_flags
&
O_DIRECT
)
return
-
EINVAL
;
pos
=
*
ppos
;
vfs_check_frozen
(
inode
->
i_sb
,
SB_FREEZE_WRITE
);
current
->
backing_dev_info
=
inode
->
i_mapping
->
backing_dev_info
;
err
=
generic_write_checks
(
file
,
&
pos
,
&
count
,
S_ISBLK
(
inode
->
i_mode
));
if
(
err
)
goto
out
;
if
(
count
==
0
)
goto
out
;
err
=
remove_suid
(
file
->
f_path
.
dentry
);
if
(
err
)
goto
out
;
file_update_time
(
file
);
mutex_lock
(
&
inode
->
i_mutex
);
while
(
count
>
0
)
{
size_t
offset
=
pos
&
(
PAGE_CACHE_SIZE
-
1
);
size_t
write_bytes
=
min
(
count
,
PAGE_CACHE_SIZE
-
offset
);
size_t
num_pages
=
(
write_bytes
+
PAGE_CACHE_SIZE
-
1
)
>>
PAGE_CACHE_SHIFT
;
mutex_lock
(
&
root
->
fs_info
->
fs_mutex
);
trans
=
btrfs_start_transaction
(
root
,
1
);
ret
=
prepare_pages
(
trans
,
root
,
file
,
pages
,
num_pages
,
pos
,
write_bytes
);
BUG_ON
(
ret
);
ret
=
btrfs_copy_from_user
(
pos
,
num_pages
,
write_bytes
,
pages
,
buf
);
BUG_ON
(
ret
);
mutex_unlock
(
&
root
->
fs_info
->
fs_mutex
);
ret
=
dirty_and_release_pages
(
trans
,
root
,
file
,
pages
,
num_pages
,
pos
,
write_bytes
);
BUG_ON
(
ret
);
btrfs_drop_pages
(
pages
,
num_pages
);
ret
=
btrfs_end_transaction
(
trans
,
root
);
buf
+=
write_bytes
;
count
-=
write_bytes
;
pos
+=
write_bytes
;
num_written
+=
write_bytes
;
balance_dirty_pages_ratelimited
(
inode
->
i_mapping
);
cond_resched
();
}
mutex_unlock
(
&
inode
->
i_mutex
);
out:
*
ppos
=
pos
;
current
->
backing_dev_info
=
NULL
;
return
num_written
?
num_written
:
err
;
}
static
int
btrfs_get_sb
(
struct
file_system_type
*
fs_type
,
int
flags
,
const
char
*
dev_name
,
void
*
data
,
struct
vfsmount
*
mnt
)
{
...
...
@@ -948,7 +1156,7 @@ static struct address_space_operations btrfs_aops = {
.
writepage
=
btrfs_writepage
,
.
sync_page
=
block_sync_page
,
.
prepare_write
=
btrfs_prepare_write
,
.
commit_write
=
nobh
_commit_write
,
.
commit_write
=
btrfs
_commit_write
,
};
static
struct
inode_operations
btrfs_file_inode_operations
=
{
...
...
@@ -958,14 +1166,10 @@ static struct inode_operations btrfs_file_inode_operations = {
static
struct
file_operations
btrfs_file_operations
=
{
.
llseek
=
generic_file_llseek
,
.
read
=
do_sync_read
,
.
write
=
do_sync_write
,
.
aio_read
=
generic_file_aio_read
,
.
aio_write
=
generic_file_aio_write
,
.
aio_read
=
generic_file_aio_read
,
.
write
=
btrfs_file_write
,
.
mmap
=
generic_file_mmap
,
.
open
=
generic_file_open
,
.
sendfile
=
generic_file_sendfile
,
.
splice_read
=
generic_file_splice_read
,
.
splice_write
=
generic_file_splice_write
,
};
static
int
__init
init_btrfs_fs
(
void
)
...
...
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