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Kirill Smelkov
linux
Commits
dee26a9f
Commit
dee26a9f
authored
Mar 26, 2007
by
Chris Mason
Committed by
David Woodhouse
Mar 26, 2007
Browse files
Options
Browse Files
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Email Patches
Plain Diff
btrfs_get_block, file read/write
Signed-off-by:
Chris Mason
<
chris.mason@oracle.com
>
parent
4730a4bc
Changes
5
Show whitespace changes
Inline
Side-by-side
Showing
5 changed files
with
230 additions
and
41 deletions
+230
-41
fs/btrfs/TODO
fs/btrfs/TODO
+1
-0
fs/btrfs/ctree.h
fs/btrfs/ctree.h
+23
-3
fs/btrfs/extent-tree.c
fs/btrfs/extent-tree.c
+2
-2
fs/btrfs/file-item.c
fs/btrfs/file-item.c
+50
-2
fs/btrfs/super.c
fs/btrfs/super.c
+154
-34
No files found.
fs/btrfs/TODO
View file @
dee26a9f
...
@@ -8,6 +8,7 @@
...
@@ -8,6 +8,7 @@
* Add block mapping tree (simple dm layer)
* Add block mapping tree (simple dm layer)
* Add simple tree locking (semaphore per tree)
* Add simple tree locking (semaphore per tree)
* Make allocator smarter
* Make allocator smarter
* Make directory hashing work on 32 bit
* Do actual block accounting
* Do actual block accounting
* Check compat and incompat flags on the inode
* Check compat and incompat flags on the inode
* Add virtual filesystems, mountable snapshots
* Add virtual filesystems, mountable snapshots
...
...
fs/btrfs/ctree.h
View file @
dee26a9f
...
@@ -198,7 +198,7 @@ struct btrfs_file_extent_item {
...
@@ -198,7 +198,7 @@ struct btrfs_file_extent_item {
__le64
disk_blocknr
;
__le64
disk_blocknr
;
__le64
disk_num_blocks
;
__le64
disk_num_blocks
;
/*
/*
* the logical offset in file b
yte
s (no csums)
* the logical offset in file b
lock
s (no csums)
* this extent record is for. This allows a file extent to point
* this extent record is for. This allows a file extent to point
* into the middle of an existing extent on disk, sharing it
* into the middle of an existing extent on disk, sharing it
* between two snapshots (useful if some bytes in the middle of the
* between two snapshots (useful if some bytes in the middle of the
...
@@ -812,12 +812,19 @@ static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
...
@@ -812,12 +812,19 @@ static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
((type *)(btrfs_leaf_data(leaf) + \
((type *)(btrfs_leaf_data(leaf) + \
btrfs_item_offset((leaf)->items + (slot))))
btrfs_item_offset((leaf)->items + (slot))))
/* extent-item.c */
struct
buffer_head
*
btrfs_alloc_free_block
(
struct
btrfs_trans_handle
*
trans
,
struct
buffer_head
*
btrfs_alloc_free_block
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
);
struct
btrfs_root
*
root
);
int
btrfs_alloc_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
u64
num_blocks
,
u64
search_start
,
u64
search_end
,
u64
owner
,
struct
btrfs_key
*
ins
);
int
btrfs_inc_ref
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
int
btrfs_inc_ref
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
buffer_head
*
buf
);
struct
buffer_head
*
buf
);
int
btrfs_free_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_free_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
u64
blocknr
,
u64
num_blocks
,
int
pin
);
*
root
,
u64
blocknr
,
u64
num_blocks
,
int
pin
);
int
btrfs_finish_extent_commit
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
);
/* ctree.c */
int
btrfs_search_slot
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_search_slot
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
btrfs_key
*
key
,
struct
btrfs_path
*
p
,
int
*
root
,
struct
btrfs_key
*
key
,
struct
btrfs_path
*
p
,
int
ins_len
,
int
cow
);
ins_len
,
int
cow
);
...
@@ -834,8 +841,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
...
@@ -834,8 +841,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
int
btrfs_leaf_free_space
(
struct
btrfs_root
*
root
,
struct
btrfs_leaf
*
leaf
);
int
btrfs_leaf_free_space
(
struct
btrfs_root
*
root
,
struct
btrfs_leaf
*
leaf
);
int
btrfs_drop_snapshot
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_drop_snapshot
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
buffer_head
*
snap
);
*
root
,
struct
buffer_head
*
snap
);
int
btrfs_finish_extent_commit
(
struct
btrfs_trans_handle
*
trans
,
struct
/* root-item.c */
btrfs_root
*
root
);
int
btrfs_del_root
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
int
btrfs_del_root
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
btrfs_key
*
key
);
struct
btrfs_key
*
key
);
int
btrfs_insert_root
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_insert_root
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
...
@@ -846,6 +852,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
...
@@ -846,6 +852,7 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
*
item
);
*
item
);
int
btrfs_find_last_root
(
struct
btrfs_root
*
root
,
u64
objectid
,
struct
int
btrfs_find_last_root
(
struct
btrfs_root
*
root
,
u64
objectid
,
struct
btrfs_root_item
*
item
,
struct
btrfs_key
*
key
);
btrfs_root_item
*
item
,
struct
btrfs_key
*
key
);
/* dir-item.c */
int
btrfs_insert_dir_item
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_insert_dir_item
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
const
char
*
name
,
int
name_len
,
u64
dir
,
u64
*
root
,
const
char
*
name
,
int
name_len
,
u64
dir
,
u64
objectid
,
u8
type
);
objectid
,
u8
type
);
...
@@ -854,6 +861,7 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
...
@@ -854,6 +861,7 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
const
char
*
name
,
int
name_len
,
int
mod
);
const
char
*
name
,
int
name_len
,
int
mod
);
int
btrfs_match_dir_item_name
(
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
,
int
btrfs_match_dir_item_name
(
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
,
const
char
*
name
,
int
name_len
);
const
char
*
name
,
int
name_len
);
/* inode-map.c */
int
btrfs_find_free_objectid
(
struct
btrfs_trans_handle
*
trans
,
int
btrfs_find_free_objectid
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
fs_root
,
struct
btrfs_root
*
fs_root
,
u64
dirid
,
u64
*
objectid
);
u64
dirid
,
u64
*
objectid
);
...
@@ -863,9 +871,21 @@ int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
...
@@ -863,9 +871,21 @@ int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
int
btrfs_lookup_inode_map
(
struct
btrfs_trans_handle
*
trans
,
int
btrfs_lookup_inode_map
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
,
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
,
u64
objectid
,
int
mod
);
u64
objectid
,
int
mod
);
/* inode-item.c */
int
btrfs_insert_inode
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_insert_inode
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
u64
objectid
,
struct
btrfs_inode_item
*
root
,
u64
objectid
,
struct
btrfs_inode_item
*
inode_item
);
*
inode_item
);
int
btrfs_lookup_inode
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_lookup_inode
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
,
u64
objectid
,
int
mod
);
*
root
,
struct
btrfs_path
*
path
,
u64
objectid
,
int
mod
);
/* file-item.c */
int
btrfs_alloc_file_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
u64
objectid
,
u64
offset
,
u64
num_blocks
,
u64
hint_block
,
u64
*
result
);
int
btrfs_lookup_file_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
,
u64
objectid
,
u64
blocknr
,
u64
num_blocks
,
int
mod
);
#endif
#endif
fs/btrfs/extent-tree.c
View file @
dee26a9f
...
@@ -403,7 +403,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
...
@@ -403,7 +403,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
*
*
* returns 0 if everything worked, non-zero otherwise.
* returns 0 if everything worked, non-zero otherwise.
*/
*/
static
int
alloc_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
int
btrfs_
alloc_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
u64
num_blocks
,
u64
search_start
,
u64
*
root
,
u64
num_blocks
,
u64
search_start
,
u64
search_end
,
u64
owner
,
struct
btrfs_key
*
ins
)
search_end
,
u64
owner
,
struct
btrfs_key
*
ins
)
{
{
...
@@ -458,7 +458,7 @@ struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
...
@@ -458,7 +458,7 @@ struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
int
ret
;
int
ret
;
struct
buffer_head
*
buf
;
struct
buffer_head
*
buf
;
ret
=
alloc_extent
(
trans
,
root
,
1
,
0
,
(
unsigned
long
)
-
1
,
ret
=
btrfs_
alloc_extent
(
trans
,
root
,
1
,
0
,
(
unsigned
long
)
-
1
,
btrfs_header_parentid
(
btrfs_buffer_header
(
root
->
node
)),
&
ins
);
btrfs_header_parentid
(
btrfs_buffer_header
(
root
->
node
)),
&
ins
);
if
(
ret
)
{
if
(
ret
)
{
BUG
();
BUG
();
...
...
fs/btrfs/file-item.c
View file @
dee26a9f
#include <linux/module.h>
#include <linux/module.h>
#include "ctree.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "transaction.h"
int
btrfs_create_file
(
struct
btrfs_trans_handle
*
trans
,
int
btrfs_alloc_file_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
u64
dirid
,
u64
*
objectid
)
struct
btrfs_root
*
root
,
u64
objectid
,
u64
offset
,
u64
num_blocks
,
u64
hint_block
,
u64
*
result
)
{
{
struct
btrfs_key
ins
;
int
ret
=
0
;
struct
btrfs_file_extent_item
*
item
;
struct
btrfs_key
file_key
;
struct
btrfs_path
path
;
btrfs_init_path
(
&
path
);
ret
=
btrfs_alloc_extent
(
trans
,
root
,
num_blocks
,
hint_block
,
(
u64
)
-
1
,
objectid
,
&
ins
);
BUG_ON
(
ret
);
file_key
.
objectid
=
objectid
;
file_key
.
offset
=
offset
;
file_key
.
flags
=
0
;
btrfs_set_key_type
(
&
file_key
,
BTRFS_EXTENT_DATA_KEY
);
ret
=
btrfs_insert_empty_item
(
trans
,
root
,
&
path
,
&
file_key
,
sizeof
(
*
item
));
item
=
btrfs_item_ptr
(
btrfs_buffer_leaf
(
path
.
nodes
[
0
]),
path
.
slots
[
0
],
struct
btrfs_file_extent_item
);
btrfs_set_file_extent_disk_blocknr
(
item
,
ins
.
objectid
);
btrfs_set_file_extent_disk_num_blocks
(
item
,
ins
.
offset
);
btrfs_set_file_extent_offset
(
item
,
0
);
btrfs_set_file_extent_num_blocks
(
item
,
ins
.
offset
);
mark_buffer_dirty
(
path
.
nodes
[
0
]);
*
result
=
ins
.
objectid
;
btrfs_release_path
(
root
,
&
path
);
return
0
;
return
0
;
}
}
int
btrfs_lookup_file_extent
(
struct
btrfs_trans_handle
*
trans
,
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
,
u64
objectid
,
u64
blocknr
,
u64
num_blocks
,
int
mod
)
{
int
ret
;
struct
btrfs_key
file_key
;
int
ins_len
=
mod
<
0
?
-
1
:
0
;
int
cow
=
mod
!=
0
;
file_key
.
objectid
=
objectid
;
file_key
.
offset
=
blocknr
;
file_key
.
flags
=
0
;
btrfs_set_key_type
(
&
file_key
,
BTRFS_EXTENT_DATA_KEY
);
ret
=
btrfs_search_slot
(
trans
,
root
,
&
file_key
,
path
,
ins_len
,
cow
);
return
ret
;
}
fs/btrfs/super.c
View file @
dee26a9f
...
@@ -8,6 +8,7 @@
...
@@ -8,6 +8,7 @@
#include <linux/string.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
#include <linux/backing-dev.h>
#include <linux/mpage.h>
#include "ctree.h"
#include "ctree.h"
#include "disk-io.h"
#include "disk-io.h"
#include "transaction.h"
#include "transaction.h"
...
@@ -17,6 +18,9 @@
...
@@ -17,6 +18,9 @@
static
struct
inode_operations
btrfs_dir_inode_operations
;
static
struct
inode_operations
btrfs_dir_inode_operations
;
static
struct
super_operations
btrfs_super_ops
;
static
struct
super_operations
btrfs_super_ops
;
static
struct
file_operations
btrfs_dir_file_operations
;
static
struct
file_operations
btrfs_dir_file_operations
;
static
struct
inode_operations
btrfs_file_inode_operations
;
static
struct
address_space_operations
btrfs_aops
;
static
struct
file_operations
btrfs_file_operations
;
static
void
btrfs_read_locked_inode
(
struct
inode
*
inode
)
static
void
btrfs_read_locked_inode
(
struct
inode
*
inode
)
{
{
...
@@ -57,6 +61,9 @@ static void btrfs_read_locked_inode(struct inode *inode)
...
@@ -57,6 +61,9 @@ static void btrfs_read_locked_inode(struct inode *inode)
break;
break;
#endif
#endif
case
S_IFREG
:
case
S_IFREG
:
inode
->
i_mapping
->
a_ops
=
&
btrfs_aops
;
inode
->
i_fop
=
&
btrfs_file_operations
;
inode
->
i_op
=
&
btrfs_file_inode_operations
;
break
;
break
;
case
S_IFDIR
:
case
S_IFDIR
:
inode
->
i_op
=
&
btrfs_dir_inode_operations
;
inode
->
i_op
=
&
btrfs_dir_inode_operations
;
...
@@ -214,35 +221,6 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
...
@@ -214,35 +221,6 @@ static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
return
d_splice_alias
(
inode
,
dentry
);
return
d_splice_alias
(
inode
,
dentry
);
}
}
static
void
reada_leaves
(
struct
btrfs_root
*
root
,
struct
btrfs_path
*
path
)
{
struct
buffer_head
*
bh
;
struct
btrfs_node
*
node
;
int
i
;
int
nritems
;
u64
objectid
;
u64
item_objectid
;
u64
blocknr
;
int
slot
;
if
(
!
path
->
nodes
[
1
])
return
;
node
=
btrfs_buffer_node
(
path
->
nodes
[
1
]);
slot
=
path
->
slots
[
1
];
objectid
=
btrfs_disk_key_objectid
(
&
node
->
ptrs
[
slot
].
key
);
nritems
=
btrfs_header_nritems
(
&
node
->
header
);
for
(
i
=
slot
;
i
<
nritems
;
i
++
)
{
item_objectid
=
btrfs_disk_key_objectid
(
&
node
->
ptrs
[
i
].
key
);
if
(
item_objectid
!=
objectid
)
break
;
blocknr
=
btrfs_node_blockptr
(
node
,
i
);
bh
=
sb_getblk
(
root
->
fs_info
->
sb
,
blocknr
);
ll_rw_block
(
READ
,
1
,
&
bh
);
brelse
(
bh
);
}
}
static
int
btrfs_readdir
(
struct
file
*
filp
,
void
*
dirent
,
filldir_t
filldir
)
static
int
btrfs_readdir
(
struct
file
*
filp
,
void
*
dirent
,
filldir_t
filldir
)
{
{
struct
inode
*
inode
=
filp
->
f_path
.
dentry
->
d_inode
;
struct
inode
*
inode
=
filp
->
f_path
.
dentry
->
d_inode
;
...
@@ -269,21 +247,18 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
...
@@ -269,21 +247,18 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
goto
err
;
goto
err
;
}
}
advance
=
0
;
advance
=
0
;
reada_leaves
(
root
,
&
path
);
while
(
1
)
{
while
(
1
)
{
leaf
=
btrfs_buffer_leaf
(
path
.
nodes
[
0
]);
leaf
=
btrfs_buffer_leaf
(
path
.
nodes
[
0
]);
nritems
=
btrfs_header_nritems
(
&
leaf
->
header
);
nritems
=
btrfs_header_nritems
(
&
leaf
->
header
);
slot
=
path
.
slots
[
0
];
slot
=
path
.
slots
[
0
];
if
(
advance
)
{
if
(
advance
||
slot
>=
nritems
)
{
if
(
slot
=
=
nritems
-
1
)
{
if
(
slot
>
=
nritems
-
1
)
{
ret
=
btrfs_next_leaf
(
root
,
&
path
);
ret
=
btrfs_next_leaf
(
root
,
&
path
);
if
(
ret
)
if
(
ret
)
break
;
break
;
leaf
=
btrfs_buffer_leaf
(
path
.
nodes
[
0
]);
leaf
=
btrfs_buffer_leaf
(
path
.
nodes
[
0
]);
nritems
=
btrfs_header_nritems
(
&
leaf
->
header
);
nritems
=
btrfs_header_nritems
(
&
leaf
->
header
);
slot
=
path
.
slots
[
0
];
slot
=
path
.
slots
[
0
];
if
(
path
.
nodes
[
1
]
&&
path
.
slots
[
1
]
==
0
)
reada_leaves
(
root
,
&
path
);
}
else
{
}
else
{
slot
++
;
slot
++
;
path
.
slots
[
0
]
++
;
path
.
slots
[
0
]
++
;
...
@@ -297,6 +272,8 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
...
@@ -297,6 +272,8 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
continue
;
continue
;
if
(
btrfs_disk_key_offset
(
&
item
->
key
)
<
filp
->
f_pos
)
if
(
btrfs_disk_key_offset
(
&
item
->
key
)
<
filp
->
f_pos
)
continue
;
continue
;
advance
=
1
;
di
=
btrfs_item_ptr
(
leaf
,
slot
,
struct
btrfs_dir_item
);
di
=
btrfs_item_ptr
(
leaf
,
slot
,
struct
btrfs_dir_item
);
over
=
filldir
(
dirent
,
(
const
char
*
)(
di
+
1
),
over
=
filldir
(
dirent
,
(
const
char
*
)(
di
+
1
),
btrfs_dir_name_len
(
di
),
btrfs_dir_name_len
(
di
),
...
@@ -524,6 +501,11 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
...
@@ -524,6 +501,11 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
err
=
btrfs_add_nondir
(
trans
,
dentry
,
inode
);
err
=
btrfs_add_nondir
(
trans
,
dentry
,
inode
);
if
(
err
)
if
(
err
)
drop_inode
=
1
;
drop_inode
=
1
;
else
{
inode
->
i_mapping
->
a_ops
=
&
btrfs_aops
;
inode
->
i_fop
=
&
btrfs_file_operations
;
inode
->
i_op
=
&
btrfs_file_inode_operations
;
}
dir
->
i_sb
->
s_dirt
=
1
;
dir
->
i_sb
->
s_dirt
=
1
;
btrfs_end_transaction
(
trans
,
root
);
btrfs_end_transaction
(
trans
,
root
);
out_unlock:
out_unlock:
...
@@ -623,11 +605,124 @@ printk("btrfs sync_fs\n");
...
@@ -623,11 +605,124 @@ printk("btrfs sync_fs\n");
return
0
;
return
0
;
}
}
static
int
btrfs_get_block
(
struct
inode
*
inode
,
sector_t
iblock
,
struct
buffer_head
*
result
,
int
create
)
{
int
ret
;
int
err
=
0
;
u64
blocknr
;
u64
extent_start
=
0
;
u64
extent_end
=
0
;
u64
objectid
=
inode
->
i_ino
;
struct
btrfs_path
path
;
struct
btrfs_root
*
root
=
btrfs_sb
(
inode
->
i_sb
);
struct
btrfs_trans_handle
*
trans
=
NULL
;
struct
btrfs_file_extent_item
*
item
;
struct
btrfs_leaf
*
leaf
;
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
);
ret
=
btrfs_lookup_file_extent
(
trans
,
root
,
&
path
,
inode
->
i_ino
,
iblock
,
1
,
0
);
if
(
ret
<
0
)
{
btrfs_release_path
(
root
,
&
path
);
err
=
ret
;
goto
out
;
}
if
(
ret
!=
0
)
{
if
(
path
.
slots
[
0
]
==
0
)
{
btrfs_release_path
(
root
,
&
path
);
goto
allocate
;
}
path
.
slots
[
0
]
--
;
}
item
=
btrfs_item_ptr
(
btrfs_buffer_leaf
(
path
.
nodes
[
0
]),
path
.
slots
[
0
],
struct
btrfs_file_extent_item
);
leaf
=
btrfs_buffer_leaf
(
path
.
nodes
[
0
]);
blocknr
=
btrfs_file_extent_disk_blocknr
(
item
);
blocknr
+=
btrfs_file_extent_offset
(
item
);
/* exact match found, use it */
if
(
ret
==
0
)
{
err
=
0
;
map_bh
(
result
,
inode
->
i_sb
,
blocknr
);
btrfs_release_path
(
root
,
&
path
);
goto
out
;
}
/* are we inside the extent that was found? */
found_key
=
&
leaf
->
items
[
path
.
slots
[
0
]].
key
;
if
(
btrfs_disk_key_objectid
(
found_key
)
!=
objectid
||
btrfs_disk_key_type
(
found_key
)
!=
BTRFS_EXTENT_DATA_KEY
)
{
extent_end
=
0
;
extent_start
=
0
;
btrfs_release_path
(
root
,
&
path
);
goto
allocate
;
}
extent_start
=
btrfs_disk_key_offset
(
&
leaf
->
items
[
path
.
slots
[
0
]].
key
);
extent_start
+=
btrfs_file_extent_offset
(
item
);
extent_end
=
extent_start
+
btrfs_file_extent_num_blocks
(
item
);
btrfs_release_path
(
root
,
&
path
);
if
(
iblock
>=
extent_start
&&
iblock
<
extent_end
)
{
err
=
0
;
map_bh
(
result
,
inode
->
i_sb
,
blocknr
+
iblock
-
extent_start
);
goto
out
;
}
allocate:
/* ok, create a new extent */
if
(
!
create
)
{
err
=
0
;
goto
out
;
}
ret
=
btrfs_alloc_file_extent
(
trans
,
root
,
objectid
,
iblock
,
1
,
extent_end
,
&
blocknr
);
if
(
ret
)
{
err
=
ret
;
goto
out
;
}
map_bh
(
result
,
inode
->
i_sb
,
blocknr
);
out:
if
(
trans
)
btrfs_end_transaction
(
trans
,
root
);
mutex_unlock
(
&
root
->
fs_info
->
fs_mutex
);
return
err
;
}
static
int
btrfs_prepare_write
(
struct
file
*
file
,
struct
page
*
page
,
unsigned
from
,
unsigned
to
)
{
return
block_prepare_write
(
page
,
from
,
to
,
btrfs_get_block
);
}
static
void
btrfs_write_super
(
struct
super_block
*
sb
)
static
void
btrfs_write_super
(
struct
super_block
*
sb
)
{
{
btrfs_sync_fs
(
sb
,
1
);
btrfs_sync_fs
(
sb
,
1
);
}
}
static
int
btrfs_readpage
(
struct
file
*
file
,
struct
page
*
page
)
{
return
mpage_readpage
(
page
,
btrfs_get_block
);
}
static
int
btrfs_readpages
(
struct
file
*
file
,
struct
address_space
*
mapping
,
struct
list_head
*
pages
,
unsigned
nr_pages
)
{
return
mpage_readpages
(
mapping
,
pages
,
nr_pages
,
btrfs_get_block
);
}
static
int
btrfs_writepage
(
struct
page
*
page
,
struct
writeback_control
*
wbc
)
{
return
block_write_full_page
(
page
,
btrfs_get_block
,
wbc
);
}
static
int
btrfs_get_sb
(
struct
file_system_type
*
fs_type
,
static
int
btrfs_get_sb
(
struct
file_system_type
*
fs_type
,
int
flags
,
const
char
*
dev_name
,
void
*
data
,
struct
vfsmount
*
mnt
)
int
flags
,
const
char
*
dev_name
,
void
*
data
,
struct
vfsmount
*
mnt
)
...
@@ -667,6 +762,31 @@ static struct file_operations btrfs_dir_file_operations = {
...
@@ -667,6 +762,31 @@ static struct file_operations btrfs_dir_file_operations = {
.
readdir
=
btrfs_readdir
,
.
readdir
=
btrfs_readdir
,
};
};
static
struct
address_space_operations
btrfs_aops
=
{
.
readpage
=
btrfs_readpage
,
.
readpages
=
btrfs_readpages
,
.
writepage
=
btrfs_writepage
,
.
sync_page
=
block_sync_page
,
.
prepare_write
=
btrfs_prepare_write
,
.
commit_write
=
generic_commit_write
,
};
static
struct
inode_operations
btrfs_file_inode_operations
=
{
.
truncate
=
NULL
,
};
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
,
.
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
)
static
int
__init
init_btrfs_fs
(
void
)
{
{
...
...
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