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Kirill Smelkov
wendelin.core
Commits
1115e0ff
Commit
1115e0ff
authored
Mar 05, 2020
by
Kirill Smelkov
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parent
2c2a094f
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37 additions
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40 deletions
+37
-40
wcfs/client/wcfs.cpp
wcfs/client/wcfs.cpp
+37
-40
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wcfs/client/wcfs.cpp
View file @
1115e0ff
...
...
@@ -205,48 +205,8 @@ static error mmap_efault_into(void *addr, size_t size);
static
tuple
<
uint8_t
*
,
error
>
mmap_ro
(
os
::
File
f
,
off_t
offset
,
size_t
size
);
static
error
mmap_into_ro
(
void
*
addr
,
size_t
size
,
os
::
File
f
,
off_t
offset
);
// connect creates new Conn viewing WCFS state as of @at.
pair
<
Conn
,
error
>
WCFS
::
connect
(
zodb
::
Tid
at
)
{
WCFS
*
wc
=
this
;
xerr
::
Contextf
E
(
"%s: connect @%s"
,
v
(
wc
),
v
(
at
));
etrace
(
""
);
error
err
;
// TODO support !isolated mode
// need to wait till `wcfs/head/at ≥ at` because e.g. Conn.open stats
// head/f to get f.headfsize.
err
=
wc
->
_headWait
(
at
);
if
(
err
!=
nil
)
{
return
make_pair
(
nil
,
E
(
err
));
}
WatchLink
wlink
;
tie
(
wlink
,
err
)
=
wc
->
_openwatch
();
if
(
err
!=
nil
)
return
make_pair
(
nil
,
E
(
err
));
Conn
wconn
=
adoptref
(
new
_Conn
());
wconn
->
_wc
=
wc
;
wconn
->
at
=
at
;
wconn
->
_wlink
=
wlink
;
context
::
Context
pinCtx
;
tie
(
pinCtx
,
wconn
->
_pinCancel
)
=
context
::
with_cancel
(
context
::
background
());
wconn
->
_pinWG
=
sync
::
NewWorkGroup
(
pinCtx
);
wconn
->
_pinWG
->
go
([
wconn
](
context
::
Context
ctx
)
->
error
{
return
wconn
->
_pinner
(
ctx
);
});
return
make_pair
(
wconn
,
nil
);
}
// _headWait waits till wcfs/head/at becomes ≥ at.
//
// XXX place?
//
// _headWait is currently needed, because client stats wcfs/head/f to get f
// size assuming that f size only ↑. The assumption is not generally valid
// (e.g. f might be truncated = hole puched for block at tail), but holds true
...
...
@@ -288,6 +248,43 @@ error WCFS::_headWait(zodb::Tid at) {
return
nil
;
}
// connect creates new Conn viewing WCFS state as of @at.
pair
<
Conn
,
error
>
WCFS
::
connect
(
zodb
::
Tid
at
)
{
WCFS
*
wc
=
this
;
xerr
::
Contextf
E
(
"%s: connect @%s"
,
v
(
wc
),
v
(
at
));
etrace
(
""
);
error
err
;
// TODO support !isolated mode
// need to wait till `wcfs/head/at ≥ at` because e.g. Conn.open stats
// head/f to get f.headfsize.
err
=
wc
->
_headWait
(
at
);
if
(
err
!=
nil
)
{
return
make_pair
(
nil
,
E
(
err
));
}
WatchLink
wlink
;
tie
(
wlink
,
err
)
=
wc
->
_openwatch
();
if
(
err
!=
nil
)
return
make_pair
(
nil
,
E
(
err
));
Conn
wconn
=
adoptref
(
new
_Conn
());
wconn
->
_wc
=
wc
;
wconn
->
at
=
at
;
wconn
->
_wlink
=
wlink
;
context
::
Context
pinCtx
;
tie
(
pinCtx
,
wconn
->
_pinCancel
)
=
context
::
with_cancel
(
context
::
background
());
wconn
->
_pinWG
=
sync
::
NewWorkGroup
(
pinCtx
);
wconn
->
_pinWG
->
go
([
wconn
](
context
::
Context
ctx
)
->
error
{
return
wconn
->
_pinner
(
ctx
);
});
return
make_pair
(
wconn
,
nil
);
}
static
global
<
error
>
errConnClosed
=
errors
::
New
(
"connection closed"
);
// close releases resources associated with wconn.
...
...
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