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sqlcipher/src/test_journal.c at Xcode5 · securitykernel/sqlcipher · GitHub
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/*
** 2008 Jan 22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains code for a VFS layer that acts as a wrapper around
** an existing VFS. The code in this file attempts to verify that SQLite
** correctly populates and syncs a journal file before writing to a
** corresponding database file.
**
** INTERFACE
**
** The public interface to this wrapper VFS is two functions:
**
** jt_register()
** jt_unregister()
**
** See header comments associated with those two functions below for
** details.
**
** LIMITATIONS
**
** This wrapper will not work if "PRAGMA synchronous = off" is used.
**
** OPERATION
**
** Starting a Transaction:
**
** When a write-transaction is started, the contents of the database is
** inspected and the following data stored as part of the database file
** handle (type struct jt_file):
**
** a) The page-size of the database file.
** b) The number of pages that are in the database file.
** c) The set of page numbers corresponding to free-list leaf pages.
** d) A check-sum for every page in the database file.
**
** The start of a write-transaction is deemed to have occurred when a
** 28-byte journal header is written to byte offset 0 of the journal
** file.
**
** Syncing the Journal File:
**
** Whenever the xSync method is invoked to sync a journal-file, the
** contents of the journal file are read. For each page written to
** the journal file, a check-sum is calculated and compared to the
** check-sum calculated for the corresponding database page when the
** write-transaction was initialized. The success of the comparison
** is assert()ed. So if SQLite has written something other than the
** original content to the database file, an assert() will fail.
**
** Additionally, the set of page numbers for which records exist in
** the journal file is added to (unioned with) the set of page numbers
** corresponding to free-list leaf pages collected when the
** write-transaction was initialized. This set comprises the page-numbers
** corresponding to those pages that SQLite may now safely modify.
**
** Writing to the Database File:
**
** When a block of data is written to a database file, the following
** invariants are asserted:
**
** a) That the block of data is an aligned block of page-size bytes.
**
** b) That if the page being written did not exist when the
** transaction was started (i.e. the database file is growing), then
** the journal-file must have been synced at least once since
** the start of the transaction.
**
** c) That if the page being written did exist when the transaction
** was started, then the page must have either been a free-list
** leaf page at the start of the transaction, or else must have
** been stored in the journal file prior to the most recent sync.
**
** Closing a Transaction:
**
** When a transaction is closed, all data collected at the start of
** the transaction, or following an xSync of a journal-file, is
** discarded. The end of a transaction is recognized when any one
** of the following occur:
**
** a) A block of zeroes (or anything else that is not a valid
** journal-header) is written to the start of the journal file.
**
** b) A journal file is truncated to zero bytes in size using xTruncate.
**
** c) The journal file is deleted using xDelete.
*/
#if
SQLITE_TEST
/* This file is used for testing only */
#include
"sqlite3.h"
#include
"sqliteInt.h"
/*
** Maximum pathname length supported by the jt backend.
*/
#define
JT_MAX_PATHNAME
512
/*
** Name used to identify this VFS.
*/
#define
JT_VFS_NAME
"jt"
typedef
struct
jt_file
jt_file
;
struct
jt_file
{
sqlite3_file
base
;
const
char
*
zName
;
/* Name of open file */
int
flags
;
/* Flags the file was opened with */
/* The following are only used by database file file handles */
int
eLock
;
/* Current lock held on the file */
u32
nPage
;
/* Size of file in pages when transaction started */
u32
nPagesize
;
/* Page size when transaction started */
Bitvec
*
pWritable
;
/* Bitvec of pages that may be written to the file */
u32
*
aCksum
;
/* Checksum for first nPage pages */
int
nSync
;
/* Number of times journal file has been synced */
/* Only used by journal file-handles */
sqlite3_int64
iMaxOff
;
/* Maximum offset written to this transaction */
jt_file
*
pNext
;
/* All files are stored in a linked list */
sqlite3_file
*
pReal
;
/* The file handle for the underlying vfs */
};
/*
** Method declarations for jt_file.
*/
static
int
jtClose
(
sqlite3_file
*
);
static
int
jtRead
(
sqlite3_file
*
,
void
*
,
int
iAmt
,
sqlite3_int64
iOfst
);
static
int
jtWrite
(
sqlite3_file
*
,
const
void
*
,
int
iAmt
,
sqlite3_int64
iOfst
);
static
int
jtTruncate
(
sqlite3_file
*
,
sqlite3_int64
size
);
static
int
jtSync
(
sqlite3_file
*
,
int
flags
);
static
int
jtFileSize
(
sqlite3_file
*
,
sqlite3_int64
*
pSize
);
static
int
jtLock
(
sqlite3_file
*
,
int
);
static
int
jtUnlock
(
sqlite3_file
*
,
int
);
static
int
jtCheckReservedLock
(
sqlite3_file
*
,
int
*
);
static
int
jtFileControl
(
sqlite3_file
*
,
int
op
,
void
*
pArg
);
static
int
jtSectorSize
(
sqlite3_file
*
);
static
int
jtDeviceCharacteristics
(
sqlite3_file
*
);
/*
** Method declarations for jt_vfs.
*/
static
int
jtOpen
(
sqlite3_vfs
*
,
const
char
*
,
sqlite3_file
*
,
int
,
int
*
);
static
int
jtDelete
(
sqlite3_vfs
*
,
const
char
*
zName
,
int
syncDir
);
static
int
jtAccess
(
sqlite3_vfs
*
,
const
char
*
zName
,
int
flags
,
int
*
);
static
int
jtFullPathname
(
sqlite3_vfs
*
,
const
char
*
zName
,
int
,
char
*
zOut
);
static
void
*
jtDlOpen
(
sqlite3_vfs
*
,
const
char
*
zFilename
);
static
void
jtDlError
(
sqlite3_vfs
*
,
int
nByte
,
char
*
zErrMsg
);
static
void
(
*
jtDlSym
(
sqlite3_vfs
*
,
void
*
,
const
char
*
zSymbol
))(
void
);
static
void
jtDlClose
(
sqlite3_vfs
*
,
void
*
);
static
int
jtRandomness
(
sqlite3_vfs
*
,
int
nByte
,
char
*
zOut
);
static
int
jtSleep
(
sqlite3_vfs
*
,
int
microseconds
);
static
int
jtCurrentTime
(
sqlite3_vfs
*
,
double
*
);
static
int
jtCurrentTimeInt64
(
sqlite3_vfs
*
,
sqlite3_int64
*
);
static
sqlite3_vfs
jt_vfs
=
{
2
,
/* iVersion */
sizeof
(
jt_file
),
/* szOsFile */
JT_MAX_PATHNAME
,
/* mxPathname */
0
,
/* pNext */
JT_VFS_NAME
,
/* zName */
0
,
/* pAppData */
jtOpen
,
/* xOpen */
jtDelete
,
/* xDelete */
jtAccess
,
/* xAccess */
jtFullPathname
,
/* xFullPathname */
jtDlOpen
,
/* xDlOpen */
jtDlError
,
/* xDlError */
jtDlSym
,
/* xDlSym */
jtDlClose
,
/* xDlClose */
jtRandomness
,
/* xRandomness */
jtSleep
,
/* xSleep */
jtCurrentTime
,
/* xCurrentTime */
0
,
/* xGetLastError */
jtCurrentTimeInt64
/* xCurrentTimeInt64 */
};
static
sqlite3_io_methods
jt_io_methods
=
{
1
,
/* iVersion */
jtClose
,
/* xClose */
jtRead
,
/* xRead */
jtWrite
,
/* xWrite */
jtTruncate
,
/* xTruncate */
jtSync
,
/* xSync */
jtFileSize
,
/* xFileSize */
jtLock
,
/* xLock */
jtUnlock
,
/* xUnlock */
jtCheckReservedLock
,
/* xCheckReservedLock */
jtFileControl
,
/* xFileControl */
jtSectorSize
,
/* xSectorSize */
jtDeviceCharacteristics
/* xDeviceCharacteristics */
};
struct
JtGlobal
{
sqlite3_vfs
*
pVfs
;
/* Parent VFS */
jt_file
*
pList
;
/* List of all open files */
};
static
struct
JtGlobal
g
=
{
0
,
0
};
/*
** Functions to obtain and relinquish a mutex to protect g.pList. The
** STATIC_PRNG mutex is reused, purely for the sake of convenience.
*/
static
void
enterJtMutex
(
void
){
sqlite3_mutex_enter
(
sqlite3_mutex_alloc
(
SQLITE_MUTEX_STATIC_PRNG
));
}
static
void
leaveJtMutex
(
void
){
sqlite3_mutex_leave
(
sqlite3_mutex_alloc
(
SQLITE_MUTEX_STATIC_PRNG
));
}
extern
int
sqlite3_io_error_pending
;
extern
int
sqlite3_io_error_hit
;
static
void
stop_ioerr_simulation
(
int
*
piSave
,
int
*
piSave2
){
*
piSave
=
sqlite3_io_error_pending
;
*
piSave2
=
sqlite3_io_error_hit
;
sqlite3_io_error_pending
=
-1
;
sqlite3_io_error_hit
=
0
;
}
static
void
start_ioerr_simulation
(
int
iSave
,
int
iSave2
){
sqlite3_io_error_pending
=
iSave
;
sqlite3_io_error_hit
=
iSave2
;
}
/*
** The jt_file pointed to by the argument may or may not be a file-handle
** open on a main database file. If it is, and a transaction is currently
** opened on the file, then discard all transaction related data.
*/
static
void
closeTransaction
(
jt_file
*
p
){
sqlite3BitvecDestroy
(
p
->
pWritable
);
sqlite3_free
(
p
->
aCksum
);
p
->
pWritable
=
0
;
p
->
aCksum
=
0
;
p
->
nSync
=
0
;
}
/*
** Close an jt-file.
*/
static
int
jtClose
(
sqlite3_file
*
pFile
){
jt_file
*
*
pp
;
jt_file
*
p
=
(
jt_file
*
)
pFile
;
closeTransaction
(
p
);
enterJtMutex
();
if
(
p
->
zName
){
for
(
pp
=
&
g
.
pList
;
*
pp
!=
p
;
pp
=
&
(
*
pp
)
->
pNext
);
*
pp
=
p
->
pNext
;
}
leaveJtMutex
();
return
sqlite3OsClose
(
p
->
pReal
);
}
/*
** Read data from an jt-file.
*/
static
int
jtRead
(
sqlite3_file
*
pFile
,
void
*
zBuf
,
int
iAmt
,
sqlite_int64
iOfst
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
return
sqlite3OsRead
(
p
->
pReal
,
zBuf
,
iAmt
,
iOfst
);
}
/*
** Parameter zJournal is the name of a journal file that is currently
** open. This function locates and returns the handle opened on the
** corresponding database file by the pager that currently has the
** journal file opened. This file-handle is identified by the
** following properties:
**
** a) SQLITE_OPEN_MAIN_DB was specified when the file was opened.
**
** b) The file-name specified when the file was opened matches
** all but the final 8 characters of the journal file name.
**
** c) There is currently a reserved lock on the file.
**/
static
jt_file
*
locateDatabaseHandle
(
const
char
*
zJournal
){
jt_file
*
pMain
=
0
;
enterJtMutex
();
for
(
pMain
=
g
.
pList
;
pMain
;
pMain
=
pMain
->
pNext
){
int
nName
=
(
int
)(
strlen
(
zJournal
)
-
strlen
(
"-journal"
));
if
( (
pMain
->
flags
&
SQLITE_OPEN_MAIN_DB
)
&&
((
int
)
strlen
(
pMain
->
zName
)
==
nName
)
&&
0
==
memcmp
(
pMain
->
zName
,
zJournal
,
nName
)
&&
(
pMain
->
eLock
>=
SQLITE_LOCK_RESERVED
)
){
break
;
}
}
leaveJtMutex
();
return
pMain
;
}
/*
** Parameter z points to a buffer of 4 bytes in size containing a
** unsigned 32-bit integer stored in big-endian format. Decode the
** integer and return its value.
*/
static
u32
decodeUint32
(
const
unsigned
char
*
z
){
return
(
z
[
0
]<<
24
)
+
(
z
[
1
]<<
16
)
+
(
z
[
2
]<<
8
)
+
z
[
3
];
}
/*
** Calculate a checksum from the buffer of length n bytes pointed to
** by parameter z.
*/
static
u32
genCksum
(
const
unsigned
char
*
z
,
int
n
){
int
i
;
u32
cksum
=
0
;
for
(
i
=
0
;
i
<
n
;
i
++
){
cksum
=
cksum
+
z
[
i
]
+
(
cksum
<<
3
);
}
return
cksum
;
}
/*
** The first argument, zBuf, points to a buffer containing a 28 byte
** serialized journal header. This function deserializes four of the
** integer fields contained in the journal header and writes their
** values to the output variables.
**
** SQLITE_OK is returned if the journal-header is successfully
** decoded. Otherwise, SQLITE_ERROR.
*/
static
int
decodeJournalHdr
(
const
unsigned
char
*
zBuf
,
/* Input: 28 byte journal header */
u32
*
pnRec
,
/* Out: Number of journalled records */
u32
*
pnPage
,
/* Out: Original database page count */
u32
*
pnSector
,
/* Out: Sector size in bytes */
u32
*
pnPagesize
/* Out: Page size in bytes */
){
unsigned
char
aMagic
[]
=
{
0xd9
,
0xd5
,
0x05
,
0xf9
,
0x20
,
0xa1
,
0x63
,
0xd7
};
if
(
memcmp
(
aMagic
,
zBuf
,
8
) )
return
SQLITE_ERROR
;
if
(
pnRec
)
*
pnRec
=
decodeUint32
(
&
zBuf
[
8
]);
if
(
pnPage
)
*
pnPage
=
decodeUint32
(
&
zBuf
[
16
]);
if
(
pnSector
)
*
pnSector
=
decodeUint32
(
&
zBuf
[
20
]);
if
(
pnPagesize
)
*
pnPagesize
=
decodeUint32
(
&
zBuf
[
24
]);
return
SQLITE_OK
;
}
/*
** This function is called when a new transaction is opened, just after
** the first journal-header is written to the journal file.
*/
static
int
openTransaction
(
jt_file
*
pMain
,
jt_file
*
pJournal
){
unsigned
char
*
aData
;
sqlite3_file
*
p
=
pMain
->
pReal
;
int
rc
=
SQLITE_OK
;
closeTransaction
(
pMain
);
aData
=
sqlite3_malloc
(
pMain
->
nPagesize
);
pMain
->
pWritable
=
sqlite3BitvecCreate
(
pMain
->
nPage
);
pMain
->
aCksum
=
sqlite3_malloc
(
sizeof
(
u32
)
*
(
pMain
->
nPage
+
1
));
pJournal
->
iMaxOff
=
0
;
if
( !
pMain
->
pWritable
||
!
pMain
->
aCksum
||
!
aData
){
rc
=
SQLITE_IOERR_NOMEM
;
}
else
if
(
pMain
->
nPage
>
0
){
u32
iTrunk
;
int
iSave
;
int
iSave2
;
stop_ioerr_simulation
(
&
iSave
,
&
iSave2
);
/* Read the database free-list. Add the page-number for each free-list
** leaf to the jt_file.pWritable bitvec.
*/
rc
=
sqlite3OsRead
(
p
,
aData
,
pMain
->
nPagesize
,
0
);
if
(
rc
==
SQLITE_OK
){
u32
nDbsize
=
decodeUint32
(
&
aData
[
28
]);
if
(
nDbsize
>
0
&&
memcmp
(
&
aData
[
24
],
&
aData
[
92
],
4
)
==
0
){
u32
iPg
;
for
(
iPg
=
nDbsize
+
1
;
iPg
<=
pMain
->
nPage
;
iPg
++
){
sqlite3BitvecSet
(
pMain
->
pWritable
,
iPg
);
}
}
}
iTrunk
=
decodeUint32
(
&
aData
[
32
]);
while
(
rc
==
SQLITE_OK
&&
iTrunk
>
0
){
u32
nLeaf
;
u32
iLeaf
;
sqlite3_int64
iOff
=
(
i64
)(
iTrunk
-
1
)
*
pMain
->
nPagesize
;
rc
=
sqlite3OsRead
(
p
,
aData
,
pMain
->
nPagesize
,
iOff
);
nLeaf
=
decodeUint32
(
&
aData
[
4
]);
for
(
iLeaf
=
0
;
rc
==
SQLITE_OK
&&
iLeaf
<
nLeaf
;
iLeaf
++
){
u32
pgno
=
decodeUint32
(
&
aData
[
8
+
4
*
iLeaf
]);
sqlite3BitvecSet
(
pMain
->
pWritable
,
pgno
);
}
iTrunk
=
decodeUint32
(
aData
);
}
/* Calculate and store a checksum for each page in the database file. */
if
(
rc
==
SQLITE_OK
){
int
ii
;
for
(
ii
=
0
;
rc
==
SQLITE_OK
&&
ii
<
(
int
)
pMain
->
nPage
;
ii
++
){
i64
iOff
=
(
i64
)(
pMain
->
nPagesize
)
*
(
i64
)
ii
;
if
(
iOff
==
PENDING_BYTE
)
continue
;
rc
=
sqlite3OsRead
(
pMain
->
pReal
,
aData
,
pMain
->
nPagesize
,
iOff
);
pMain
->
aCksum
[
ii
]
=
genCksum
(
aData
,
pMain
->
nPagesize
);
if
(
ii
+
1
==
pMain
->
nPage
&&
rc
==
SQLITE_IOERR_SHORT_READ
)
rc
=
SQLITE_OK
;
}
}
start_ioerr_simulation
(
iSave
,
iSave2
);
}
sqlite3_free
(
aData
);
return
rc
;
}
/*
** The first argument to this function is a handle open on a journal file.
** This function reads the journal file and adds the page number for each
** page in the journal to the Bitvec object passed as the second argument.
*/
static
int
readJournalFile
(
jt_file
*
p
,
jt_file
*
pMain
){
int
rc
=
SQLITE_OK
;
unsigned
char
zBuf
[
28
];
sqlite3_file
*
pReal
=
p
->
pReal
;
sqlite3_int64
iOff
=
0
;
sqlite3_int64
iSize
=
p
->
iMaxOff
;
unsigned
char
*
aPage
;
int
iSave
;
int
iSave2
;
aPage
=
sqlite3_malloc
(
pMain
->
nPagesize
);
if
( !
aPage
){
return
SQLITE_IOERR_NOMEM
;
}
stop_ioerr_simulation
(
&
iSave
,
&
iSave2
);
while
(
rc
==
SQLITE_OK
&&
iOff
<
iSize
){
u32
nRec
,
nPage
,
nSector
,
nPagesize
;
u32
ii
;
/* Read and decode the next journal-header from the journal file. */
rc
=
sqlite3OsRead
(
pReal
,
zBuf
,
28
,
iOff
);
if
(
rc
!=
SQLITE_OK
||
decodeJournalHdr
(
zBuf
,
&
nRec
,
&
nPage
,
&
nSector
,
&
nPagesize
)
){
goto
finish_rjf
;
}
iOff
+=
nSector
;
if
(
nRec
==
0
){
/* A trick. There might be another journal-header immediately
** following this one. In this case, 0 records means 0 records,
** not "read until the end of the file". See also ticket #2565.
*/
if
(
iSize
>=(
iOff
+
nSector
) ){
rc
=
sqlite3OsRead
(
pReal
,
zBuf
,
28
,
iOff
);
if
(
rc
!=
SQLITE_OK
||
0
==
decodeJournalHdr
(
zBuf
,
0
,
0
,
0
,
0
) ){
continue
;
}
}
nRec
=
(
u32
)((
iSize
-
iOff
) / (
pMain
->
nPagesize
+
8
));
}
/* Read all the records that follow the journal-header just read. */
for
(
ii
=
0
;
rc
==
SQLITE_OK
&&
ii
<
nRec
&&
iOff
<
iSize
;
ii
++
){
u32
pgno
;
rc
=
sqlite3OsRead
(
pReal
,
zBuf
,
4
,
iOff
);
if
(
rc
==
SQLITE_OK
){
pgno
=
decodeUint32
(
zBuf
);
if
(
pgno
>
0
&&
pgno
<=
pMain
->
nPage
){
if
(
0
==
sqlite3BitvecTest
(
pMain
->
pWritable
,
pgno
) ){
rc
=
sqlite3OsRead
(
pReal
,
aPage
,
pMain
->
nPagesize
,
iOff
+
4
);
if
(
rc
==
SQLITE_OK
){
u32
cksum
=
genCksum
(
aPage
,
pMain
->
nPagesize
);
assert
(
cksum
==
pMain
->
aCksum
[
pgno
-
1
] );
}
}
sqlite3BitvecSet
(
pMain
->
pWritable
,
pgno
);
}
iOff
+=
(
8
+
pMain
->
nPagesize
);
}
}
iOff
=
((
iOff
+
(
nSector
-
1
)) /
nSector
)
*
nSector
;
}
finish_rjf
:
start_ioerr_simulation
(
iSave
,
iSave2
);
sqlite3_free
(
aPage
);
if
(
rc
==
SQLITE_IOERR_SHORT_READ
){
rc
=
SQLITE_OK
;
}
return
rc
;
}
/*
** Write data to an jt-file.
*/
static
int
jtWrite
(
sqlite3_file
*
pFile
,
const
void
*
zBuf
,
int
iAmt
,
sqlite_int64
iOfst
){
int
rc
;
jt_file
*
p
=
(
jt_file
*
)
pFile
;
if
(
p
->
flags
&
SQLITE_OPEN_MAIN_JOURNAL
){
if
(
iOfst
==
0
){
jt_file
*
pMain
=
locateDatabaseHandle
(
p
->
zName
);
assert
(
pMain
);
if
(
iAmt
==
28
){
/* Zeroing the first journal-file header. This is the end of a
** transaction. */
closeTransaction
(
pMain
);
}
else
if
(
iAmt
!=
12
){
/* Writing the first journal header to a journal file. This happens
** when a transaction is first started. */
u8
*
z
=
(
u8
*
)
zBuf
;
pMain
->
nPage
=
decodeUint32
(
&
z
[
16
]);
pMain
->
nPagesize
=
decodeUint32
(
&
z
[
24
]);
if
(
SQLITE_OK
!=
(
rc
=
openTransaction
(
pMain
,
p
)) ){
return
rc
;
}
}
}
if
(
p
->
iMaxOff
<
(
iOfst
+
iAmt
) ){
p
->
iMaxOff
=
iOfst
+
iAmt
;
}
}
if
(
p
->
flags
&
SQLITE_OPEN_MAIN_DB
&&
p
->
pWritable
){
if
(
iAmt
<
(
int
)
p
->
nPagesize
&&
p
->
nPagesize
%
iAmt
==
0
&&
iOfst
>=(
PENDING_BYTE
+
512
)
&&
iOfst
+
iAmt
<=
PENDING_BYTE
+
p
->
nPagesize
){
/* No-op. This special case is hit when the backup code is copying a
** to a database with a larger page-size than the source database and
** it needs to fill in the non-locking-region part of the original
** pending-byte page.
*/
}
else
{
u32
pgno
=
(
u32
)(
iOfst
/
p
->
nPagesize
+
1
);
assert
( (
iAmt
==
1
||
iAmt
==
p
->
nPagesize
)
&&
((
iOfst
+
iAmt
)%
p
->
nPagesize
)
==
0
);
assert
(
pgno
<=
p
->
nPage
||
p
->
nSync
>
0
);
assert
(
pgno
>
p
->
nPage
||
sqlite3BitvecTest
(
p
->
pWritable
,
pgno
) );
}
}
rc
=
sqlite3OsWrite
(
p
->
pReal
,
zBuf
,
iAmt
,
iOfst
);
if
( (
p
->
flags
&
SQLITE_OPEN_MAIN_JOURNAL
)
&&
iAmt
==
12
){
jt_file
*
pMain
=
locateDatabaseHandle
(
p
->
zName
);
int
rc2
=
readJournalFile
(
p
,
pMain
);
if
(
rc
==
SQLITE_OK
)
rc
=
rc2
;
}
return
rc
;
}
/*
** Truncate an jt-file.
*/
static
int
jtTruncate
(
sqlite3_file
*
pFile
,
sqlite_int64
size
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
if
(
p
->
flags
&
SQLITE_OPEN_MAIN_JOURNAL
&&
size
==
0
){
/* Truncating a journal file. This is the end of a transaction. */
jt_file
*
pMain
=
locateDatabaseHandle
(
p
->
zName
);
closeTransaction
(
pMain
);
}
if
(
p
->
flags
&
SQLITE_OPEN_MAIN_DB
&&
p
->
pWritable
){
u32
pgno
;
u32
locking_page
=
(
u32
)(
PENDING_BYTE
/
p
->
nPagesize
+
1
);
for
(
pgno
=
(
u32
)(
size
/
p
->
nPagesize
+
1
);
pgno
<=
p
->
nPage
;
pgno
++
){
assert
(
pgno
==
locking_page
||
sqlite3BitvecTest
(
p
->
pWritable
,
pgno
) );
}
}
return
sqlite3OsTruncate
(
p
->
pReal
,
size
);
}
/*
** Sync an jt-file.
*/
static
int
jtSync
(
sqlite3_file
*
pFile
,
int
flags
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
if
(
p
->
flags
&
SQLITE_OPEN_MAIN_JOURNAL
){
int
rc
;
jt_file
*
pMain
;
/* The associated database file */
/* The journal file is being synced. At this point, we inspect the
** contents of the file up to this point and set each bit in the
** jt_file.pWritable bitvec of the main database file associated with
** this journal file.
*/
pMain
=
locateDatabaseHandle
(
p
->
zName
);
assert
(
pMain
);
/* Set the bitvec values */
if
(
pMain
->
pWritable
){
pMain
->
nSync
++
;
rc
=
readJournalFile
(
p
,
pMain
);
if
(
rc
!=
SQLITE_OK
){
return
rc
;
}
}
}
return
sqlite3OsSync
(
p
->
pReal
,
flags
);
}
/*
** Return the current file-size of an jt-file.
*/
static
int
jtFileSize
(
sqlite3_file
*
pFile
,
sqlite_int64
*
pSize
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
return
sqlite3OsFileSize
(
p
->
pReal
,
pSize
);
}
/*
** Lock an jt-file.
*/
static
int
jtLock
(
sqlite3_file
*
pFile
,
int
eLock
){
int
rc
;
jt_file
*
p
=
(
jt_file
*
)
pFile
;
rc
=
sqlite3OsLock
(
p
->
pReal
,
eLock
);
if
(
rc
==
SQLITE_OK
&&
eLock
>
p
->
eLock
){
p
->
eLock
=
eLock
;
}
return
rc
;
}
/*
** Unlock an jt-file.
*/
static
int
jtUnlock
(
sqlite3_file
*
pFile
,
int
eLock
){
int
rc
;
jt_file
*
p
=
(
jt_file
*
)
pFile
;
rc
=
sqlite3OsUnlock
(
p
->
pReal
,
eLock
);
if
(
rc
==
SQLITE_OK
&&
eLock
<
p
->
eLock
){
p
->
eLock
=
eLock
;
}
return
rc
;
}
/*
** Check if another file-handle holds a RESERVED lock on an jt-file.
*/
static
int
jtCheckReservedLock
(
sqlite3_file
*
pFile
,
int
*
pResOut
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
return
sqlite3OsCheckReservedLock
(
p
->
pReal
,
pResOut
);
}
/*
** File control method. For custom operations on an jt-file.
*/
static
int
jtFileControl
(
sqlite3_file
*
pFile
,
int
op
,
void
*
pArg
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
return
p
->
pReal
->
pMethods
->
xFileControl
(
p
->
pReal
,
op
,
pArg
);
}
/*
** Return the sector-size in bytes for an jt-file.
*/
static
int
jtSectorSize
(
sqlite3_file
*
pFile
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
return
sqlite3OsSectorSize
(
p
->
pReal
);
}
/*
** Return the device characteristic flags supported by an jt-file.
*/
static
int
jtDeviceCharacteristics
(
sqlite3_file
*
pFile
){
jt_file
*
p
=
(
jt_file
*
)
pFile
;
return
sqlite3OsDeviceCharacteristics
(
p
->
pReal
);
}
/*
** Open an jt file handle.
*/
static
int
jtOpen
(
sqlite3_vfs
*
pVfs
,
const
char
*
zName
,
sqlite3_file
*
pFile
,
int
flags
,
int
*
pOutFlags
){
int
rc
;
jt_file
*
p
=
(
jt_file
*
)
pFile
;
pFile
->
pMethods
=
0
;
p
->
pReal
=
(
sqlite3_file
*
)
&
p
[
1
];
p
->
pReal
->
pMethods
=
0
;
rc
=
sqlite3OsOpen
(
g
.
pVfs
,
zName
,
p
->
pReal
,
flags
,
pOutFlags
);
assert
(
rc
==
SQLITE_OK
||
p
->
pReal
->
pMethods
==
0
);
if
(
rc
==
SQLITE_OK
){
pFile
->
pMethods
=
&
jt_io_methods
;
p
->
eLock
=
0
;
p
->
zName
=
zName
;
p
->
flags
=
flags
;
p
->
pNext
=
0
;
p
->
pWritable
=
0
;
p
->
aCksum
=
0
;
enterJtMutex
();
if
(
zName
){
p
->
pNext
=
g
.
pList
;
g
.
pList
=
p
;
}
leaveJtMutex
();
}
return
rc
;
}
/*
** Delete the file located at zPath. If the dirSync argument is true,
** ensure the file-system modifications are synced to disk before
** returning.
*/
static
int
jtDelete
(
sqlite3_vfs
*
pVfs
,
const
char
*
zPath
,
int
dirSync
){
int
nPath
=
(
int
)
strlen
(
zPath
);
if
(
nPath
>
8
&&
0
==
strcmp
(
"-journal"
,
&
zPath
[
nPath
-
8
]) ){
/* Deleting a journal file. The end of a transaction. */
jt_file
*
pMain
=
locateDatabaseHandle
(
zPath
);
if
(
pMain
){
closeTransaction
(
pMain
);
}
}
return
sqlite3OsDelete
(
g
.
pVfs
,
zPath
,
dirSync
);
}
/*
** Test for access permissions. Return true if the requested permission
** is available, or false otherwise.
*/
static
int
jtAccess
(
sqlite3_vfs
*
pVfs
,
const
char
*
zPath
,
int
flags
,
int
*
pResOut
){
return
sqlite3OsAccess
(
g
.
pVfs
,
zPath
,
flags
,
pResOut
);
}
/*
** Populate buffer zOut with the full canonical pathname corresponding
** to the pathname in zPath. zOut is guaranteed to point to a buffer
** of at least (JT_MAX_PATHNAME+1) bytes.
*/
static
int
jtFullPathname
(
sqlite3_vfs
*
pVfs
,
const
char
*
zPath
,
int
nOut
,
char
*
zOut
){
return
sqlite3OsFullPathname
(
g
.
pVfs
,
zPath
,
nOut
,
zOut
);
}
/*
** Open the dynamic library located at zPath and return a handle.
*/
static
void
*
jtDlOpen
(
sqlite3_vfs
*
pVfs
,
const
char
*
zPath
){
return
g
.
pVfs
->
xDlOpen
(
g
.
pVfs
,
zPath
);
}
/*
** Populate the buffer zErrMsg (size nByte bytes) with a human readable
** utf-8 string describing the most recent error encountered associated
** with dynamic libraries.
*/
static
void
jtDlError
(
sqlite3_vfs
*
pVfs
,
int
nByte
,
char
*
zErrMsg
){
g
.
pVfs
->
xDlError
(
g
.
pVfs
,
nByte
,
zErrMsg
);
}
/*
** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
*/
static
void
(
*
jtDlSym
(
sqlite3_vfs
*
pVfs
,
void
*
p
,
const
char
*
zSym
))(
void
){
return
g
.
pVfs
->
xDlSym
(
g
.
pVfs
,
p
,
zSym
);
}
/*
** Close the dynamic library handle pHandle.
*/
static
void
jtDlClose
(
sqlite3_vfs
*
pVfs
,
void
*
pHandle
){
g
.
pVfs
->
xDlClose
(
g
.
pVfs
,
pHandle
);
}
/*
** Populate the buffer pointed to by zBufOut with nByte bytes of
** random data.
*/
static
int
jtRandomness
(
sqlite3_vfs
*
pVfs
,
int
nByte
,
char
*
zBufOut
){
return
sqlite3OsRandomness
(
g
.
pVfs
,
nByte
,
zBufOut
);
}
/*
** Sleep for nMicro microseconds. Return the number of microseconds
** actually slept.
*/
static
int
jtSleep
(
sqlite3_vfs
*
pVfs
,
int
nMicro
){
return
sqlite3OsSleep
(
g
.
pVfs
,
nMicro
);
}
/*
** Return the current time as a Julian Day number in *pTimeOut.
*/
static
int
jtCurrentTime
(
sqlite3_vfs
*
pVfs
,
double
*
pTimeOut
){
return
g
.
pVfs
->
xCurrentTime
(
g
.
pVfs
,
pTimeOut
);
}
/*
** Return the current time as a Julian Day number in *pTimeOut.
*/
static
int
jtCurrentTimeInt64
(
sqlite3_vfs
*
pVfs
,
sqlite3_int64
*
pTimeOut
){
return
g
.
pVfs
->
xCurrentTimeInt64
(
g
.
pVfs
,
pTimeOut
);
}
/**************************************************************************
** Start of public API.
*/
/*
** Configure the jt VFS as a wrapper around the VFS named by parameter
** zWrap. If the isDefault parameter is true, then the jt VFS is installed
** as the new default VFS for SQLite connections. If isDefault is not
** true, then the jt VFS is installed as non-default. In this case it
** is available via its name, "jt".
*/
int
jt_register
(
char
*
zWrap
,
int
isDefault
){
g
.
pVfs
=
sqlite3_vfs_find
(
zWrap
);
if
(
g
.
pVfs
==
0
){
return
SQLITE_ERROR
;
}
jt_vfs
.
szOsFile
=
sizeof
(
jt_file
)
+
g
.
pVfs
->
szOsFile
;
if
(
g
.
pVfs
->
iVersion
==
1
){
jt_vfs
.
iVersion
=
1
;
}
else
if
(
g
.
pVfs
->
xCurrentTimeInt64
==
0
){
jt_vfs
.
xCurrentTimeInt64
=
0
;
}
sqlite3_vfs_register
(
&
jt_vfs
,
isDefault
);
return
SQLITE_OK
;
}
/*
** Uninstall the jt VFS, if it is installed.
*/
void
jt_unregister
(
void
){
sqlite3_vfs_unregister
(
&
jt_vfs
);
}
#endif
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