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unix.cpp
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unix.cpp
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/*
* PROGRAM: JRD Access Method
* MODULE: unix.cpp
* DESCRIPTION: UNIX (BSD) specific physical IO
*
* The contents of this file are subject to the Interbase Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy
* of the License at http://www.Inprise.com/IPL.html
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
* or implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code was created by Inprise Corporation
* and its predecessors. Portions created by Inprise Corporation are
* Copyright (C) Inprise Corporation.
*
* All Rights Reserved.
* Contributor(s): ______________________________________.
* 2001.07.06 Sean Leyne - Code Cleanup, removed "#ifdef READONLY_DATABASE"
* conditionals, as the engine now fully supports
* readonly databases.
*
* 2002.10.27 Sean Leyne - Completed removal of "DELTA" port
*
*/
#include "firebird.h"
#include "../jrd/common.h"
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <sys/file.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_AIO_H
#include <aio.h>
#endif
#include "../jrd/jrd.h"
#include "../jrd/os/pio.h"
#include "../jrd/ods.h"
#include "../jrd/lck.h"
#include "../jrd/cch.h"
#include "../jrd/ibase.h"
#include "gen/iberror.h"
#include "../jrd/cch_proto.h"
#include "../jrd/err_proto.h"
#include "../jrd/gds_proto.h"
#include "../jrd/isc_proto.h"
#include "../jrd/isc_f_proto.h"
#include "../jrd/os/isc_i_proto.h"
#include "../jrd/lck_proto.h"
#include "../jrd/mov_proto.h"
#include "../jrd/ods_proto.h"
#include "../jrd/os/pio_proto.h"
#include "../jrd/thd.h"
#include "../common/classes/init.h"
using namespace Jrd;
// Some operating systems have problems with use of write/read with
// big (>2Gb) files. On the other hand, pwrite/pread works fine for them.
// Therefore:
#if defined SOLARIS
#define BROKEN_IO_64
#endif
// which will force use of pread/pwrite even for CS.
/* SUPERSERVER uses a mutex to allow atomic seek/read(write) sequences.
When possible, it uses "positioned" read (write) calls to avoid a seek
and allow multiple threads to overlap database I/O. This functions also
help at some OSs with broken read/write calls. */
#if defined SUPERSERVER || defined BROKEN_IO_64
#if (defined PREAD && defined PWRITE) || defined HAVE_AIO_H
#define PREAD_PWRITE
#endif
#endif
#ifdef SUPERSERVER
#define THD_IO_MUTEX_LOCK(mutx) mutx.enter()
#define THD_IO_MUTEX_UNLOCK(mutx) mutx.leave()
#else
#define THD_IO_MUTEX_LOCK(mutx)
#define THD_IO_MUTEX_UNLOCK(mutx)
#endif
#define IO_RETRY 20
#ifdef O_SYNC
#define SYNC O_SYNC
#endif
/* Changed to not redfine SYNC if O_SYNC already exists
they seem to be the same values anyway. MOD 13-07-2001 */
#if (!(defined SYNC) && (defined O_FSYNC))
#define SYNC O_FSYNC
#endif
#ifdef O_DSYNC
#undef SYNC
#define SYNC O_DSYNC
#endif
#ifndef SYNC
#define SYNC 0
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifdef SUPERSERVER
#define MASK 0600
#else
#define MASK 0666
#endif
#define FCNTL_BROKEN
// please undefine FCNTL_BROKEN for operating systems,
// that can successfully change BOTH O_DIRECT and O_SYNC using fcntl()
static jrd_file* seek_file(jrd_file*, BufferDesc*, UINT64 *, ISC_STATUS *);
static jrd_file* setup_file(Database*, const Firebird::PathName&, int);
static bool unix_error(TEXT*, const jrd_file*, ISC_STATUS, ISC_STATUS*);
#if defined PREAD_PWRITE && !(defined HAVE_PREAD && defined HAVE_PWRITE)
static SLONG pread(int, SCHAR *, SLONG, SLONG);
static SLONG pwrite(int, SCHAR *, SLONG, SLONG);
#endif
#ifdef SUPPORT_RAW_DEVICES
static bool raw_devices_check_file (const Firebird::PathName&);
static bool raw_devices_validate_database (int, const Firebird::PathName&);
static int raw_devices_unlink_database (const Firebird::PathName&);
#endif
static int openFile(const char*, bool, bool, bool);
#ifdef hpux
union fcntlun {
int val;
struct flock *lockdes;
};
#endif
int PIO_add_file(Database* dbb, jrd_file* main_file, const Firebird::PathName& file_name, SLONG start)
{
/**************************************
*
* P I O _ a d d _ f i l e
*
**************************************
*
* Functional description
* Add a file to an existing database. Return the sequence
* number of the new file. If anything goes wrong, return a
* sequence of 0.
* NOTE: This routine does not lock any mutexes on
* its own behalf. It is assumed that mutexes will
* have been locked before entry.
*
**************************************/
jrd_file* new_file = PIO_create(dbb, file_name, false, false, false);
if (!new_file)
return 0;
new_file->fil_min_page = start;
USHORT sequence = 1;
jrd_file* file;
for (file = main_file; file->fil_next; file = file->fil_next)
++sequence;
file->fil_max_page = start - 1;
file->fil_next = new_file;
return sequence;
}
void PIO_close(jrd_file* main_file)
{
/**************************************
*
* P I O _ c l o s e
*
**************************************
*
* Functional description
* NOTE: This routine does not lock any mutexes on
* its own behalf. It is assumed that mutexes will
* have been locked before entry.
*
**************************************/
for (jrd_file* file = main_file; file; file = file->fil_next) {
if (file->fil_desc && file->fil_desc != -1) {
close(file->fil_desc);
file->fil_desc = -1;
}
}
}
jrd_file* PIO_create(Database* dbb, const Firebird::PathName& string, bool overwrite, bool /*temporary*/, bool /*share_delete*/)
{
/**************************************
*
* P I O _ c r e a t e
*
**************************************
*
* Functional description
* Create a new database file.
* NOTE: This routine does not lock any mutexes on
* its own behalf. It is assumed that mutexes will
* have been locked before entry.
*
**************************************/
const TEXT* file_name = string.c_str();
#ifdef SUPERSERVER_V2
const int flag =
SYNC | O_RDWR | O_CREAT | (overwrite ? O_TRUNC : O_EXCL) | O_BINARY;
#else
#ifdef SUPPORT_RAW_DEVICES
const int flag = O_RDWR |
(raw_devices_check_file(file_name) ? 0 : O_CREAT) |
(overwrite ? O_TRUNC : O_EXCL) |
O_BINARY;
#else
const int flag = O_RDWR | O_CREAT | (overwrite ? O_TRUNC : O_EXCL) | O_BINARY;
#endif
#endif
const int desc = open(file_name, flag, MASK);
if (desc == -1)
{
ERR_post(isc_io_error,
isc_arg_string, "open O_CREAT",
isc_arg_cstring, string.length(), ERR_cstring(string),
isc_arg_gds, isc_io_create_err, isc_arg_unix, errno, 0);
}
// posix_fadvise(desc, 0, 0, POSIX_FADV_RANDOM);
/* File open succeeded. Now expand the file name. */
Firebird::PathName expanded_name(string);
ISC_expand_filename(expanded_name, false);
jrd_file* file;
try
{
file = setup_file(dbb, expanded_name, desc);
}
catch (const Firebird::Exception&)
{
close(desc);
throw;
}
return file;
}
bool PIO_expand(const TEXT* file_name, USHORT file_length, TEXT* expanded_name, size_t len_expanded)
{
/**************************************
*
* P I O _ e x p a n d
*
**************************************
*
* Functional description
* Fully expand a file name. If the file doesn't exist, do something
* intelligent.
*
**************************************/
return ISC_expand_filename(file_name, file_length,
expanded_name, len_expanded, false);
}
void PIO_extend(jrd_file* /*main_file*/, const ULONG /*extPages*/, const USHORT /*pageSize*/)
{
/**************************************
*
* P I O _ e x t e n d
*
**************************************
*
* Functional description
* Extend file by extPages pages of pageSize size.
*
**************************************/
// not implemented
return;
}
void PIO_flush(jrd_file* main_file)
{
/**************************************
*
* P I O _ f l u s h
*
**************************************
*
* Functional description
* Flush the operating system cache back to good, solid oxide.
*
**************************************/
/* Since all SUPERSERVER_V2 database and shadow I/O is synchronous, this
is a no-op. */
#ifndef SUPERSERVER_V2
for (jrd_file* file = main_file; file; file = file->fil_next) {
if (file->fil_desc != -1) { /* This really should be an error */
THD_IO_MUTEX_LOCK(file->fil_mutex);
fsync(file->fil_desc);
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
}
}
#endif
}
static bool maybe_close_file(int& desc)
{
/**************************************
*
* M a y b e C l o s e F i l e
*
**************************************
*
* Functional description
* If the file is open, close it.
*
**************************************/
if (desc >= 0)
{
close(desc);
desc = -1;
return true;
}
return false;
}
void PIO_force_write(jrd_file* file, bool forcedWrites, bool notUseFSCache)
{
/**************************************
*
* P I O _ f o r c e _ w r i t e ( G E N E R I C )
*
**************************************
*
* Functional description
* Set (or clear) force write, if possible, for the database.
*
**************************************/
/* Since all SUPERSERVER_V2 database and shadow I/O is synchronous, this
is a no-op. */
#ifndef SUPERSERVER_V2
const bool oldForce = (file->fil_flags & FIL_force_write) != 0;
const bool oldNotUseCache = (file->fil_flags & FIL_no_fs_cache) != 0;
if (forcedWrites != oldForce || notUseFSCache != oldNotUseCache)
{
#ifdef hpux
union fcntlun control;
control.val = (forcedWrites) ? SYNC : NULL ;
#else
const int control = (forcedWrites ? SYNC : 0) | (notUseFSCache ? O_DIRECT : 0);
#endif
#ifndef FCNTL_BROKEN
if (fcntl(file->fil_desc, F_SETFL, control) == -1)
{
ERR_post(isc_io_error,
isc_arg_string, "fcntl() SYNC/DIRECT",
isc_arg_cstring, file->fil_length,
ERR_string(file->fil_string, file->fil_length), isc_arg_gds,
isc_io_access_err, isc_arg_unix, errno, 0);
}
#else //FCNTL_BROKEN
maybe_close_file(file->fil_desc);
file->fil_desc = openFile(file->fil_string, forcedWrites,
notUseFSCache, file->fil_flags & FIL_readonly);
if (file->fil_desc == -1)
{
ERR_post(isc_io_error, isc_arg_string, "re open() for SYNC/DIRECT",
isc_arg_cstring, file->fil_length, ERR_string(file->fil_string, file->fil_length),
isc_arg_gds, isc_io_open_err, isc_arg_unix, errno, 0);
}
#endif //FCNTL_BROKEN
file->fil_flags &= ~(FIL_force_write | FIL_no_fs_cache);
file->fil_flags |= (forcedWrites ? FIL_force_write : 0) |
(notUseFSCache ? FIL_no_fs_cache : 0);
}
#endif
}
ULONG PIO_get_number_of_pages(const jrd_file* file, const USHORT pagesize)
{
/**************************************
*
* P I O _ g e t _ n u m b e r _ o f _ p a g e s
*
**************************************
*
* Functional description
* Compute number of pages in file, based only on file size.
*
**************************************/
if (file->fil_desc == -1) {
unix_error("fstat", file, isc_io_access_err, 0);
return (0);
}
struct stat statistics;
if (fstat(file->fil_desc, &statistics)) {
unix_error("fstat", file, isc_io_access_err, 0);
}
const UINT64 length = statistics.st_size;
/****
#ifndef sun
length = statistics.st_size;
#else
length = statistics.st_blocks * statistics.st_blksize;
#endif
****/
return (length + pagesize - 1) / pagesize;
}
void PIO_header(Database* dbb, SCHAR * address, int length)
{
/**************************************
*
* P I O _ h e a d e r
*
**************************************
*
* Functional description
* Read the page header. This assumes that the file has not been
* repositioned since the file was originally mapped.
*
**************************************/
int i;
UINT64 bytes;
PageSpace* pageSpace = dbb->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
jrd_file* file = pageSpace->file;
SignalInhibit siHolder;
if (file->fil_desc == -1)
unix_error("PIO_header", file, isc_io_read_err, 0);
for (i = 0; i < IO_RETRY; i++) {
#ifndef PREAD_PWRITE
THD_IO_MUTEX_LOCK(file->fil_mutex);
if ((lseek(file->fil_desc, LSEEK_OFFSET_CAST 0, 0)) == -1) {
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
unix_error("lseek", file, isc_io_read_err, 0);
}
#endif
#ifdef ISC_DATABASE_ENCRYPTION
if (dbb->dbb_encrypt_key) {
SLONG spare_buffer[MAX_PAGE_SIZE / sizeof(SLONG)];
#ifdef PREAD_PWRITE
if ((bytes = pread(file->fil_desc, spare_buffer, length, 0)) ==
(UINT64) -1) {
#else
if ((bytes = read(file->fil_desc, spare_buffer, length)) ==
(UINT64) -1) {
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (SYSCALL_INTERRUPTED(errno))
continue;
unix_error("read", file, isc_io_read_err, 0);
}
(*dbb->dbb_decrypt) (dbb->dbb_encrypt_key->str_data,
spare_buffer, length, address);
}
else
#endif /* ISC_DATABASE_ENCRYPTION */
#ifdef PREAD_PWRITE
if ((bytes = pread(file->fil_desc, address, length, 0)) == (UINT64) -1) {
#else
if ((bytes = read(file->fil_desc, address, length)) == (UINT64) -1) {
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (SYSCALL_INTERRUPTED(errno))
continue;
unix_error("read", file, isc_io_read_err, 0);
}
else
break;
}
if (i == IO_RETRY) {
if (bytes == 0) {
#ifdef DEV_BUILD
fprintf(stderr, "PIO_header: an empty page read!\n");
fflush(stderr);
#endif
}
else {
#ifdef DEV_BUILD
fprintf(stderr, "PIO_header: retry count exceeded\n");
fflush(stderr);
#endif
unix_error("read_retry", file, isc_io_read_err, 0);
}
}
#ifndef PREAD_PWRITE
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
}
namespace {
// we need a class here only to return memory on shutdown and avoid
// false memory leak reports
static const int ZERO_BUF_SIZE = 1024 * 128;
class HugeStaticBuffer
{
public:
HugeStaticBuffer(MemoryPool& p)
: zeroArray(p),
zeroBuff(zeroArray.getBuffer(ZERO_BUF_SIZE))
{
memset(zeroBuff, 0, ZERO_BUF_SIZE);
}
const char* get() { return zeroBuff; }
private:
Firebird::Array<char> zeroArray;
char* zeroBuff;
};
static Firebird::InitInstance<HugeStaticBuffer> zeros;
}
USHORT PIO_init_data(Database* dbb, jrd_file* main_file, ISC_STATUS* status_vector,
ULONG startPage, USHORT initPages)
{
/**************************************
*
* P I O _ i n i t _ d a t a
*
**************************************
*
* Functional description
* Initialize tail of file with zeros
*
**************************************/
// Fake buffer, used in seek_file. Page space ID have no matter there
// as we already know file to work with
BufferDesc bdb;
bdb.bdb_dbb = dbb;
bdb.bdb_page = PageNumber(0, startPage);
UINT64 bytes, offset;
SignalInhibit siHolder;
jrd_file* file = seek_file(main_file, &bdb, &offset, status_vector);
if (!file)
return 0;
if (file->fil_min_page + 8 > startPage)
return 0;
USHORT leftPages = initPages;
const ULONG initBy = MIN(file->fil_max_page - startPage, leftPages);
for (ULONG i = startPage; i < startPage + initBy; )
{
bdb.bdb_page = PageNumber(0, i);
USHORT write_pages = ZERO_BUF_SIZE / dbb->dbb_page_size;
if (write_pages > leftPages)
write_pages = leftPages;
SLONG to_write = write_pages * dbb->dbb_page_size;
SLONG written;
for (int r = 0; r < IO_RETRY; r++)
{
if (!(file = seek_file(file, &bdb, &offset, status_vector)))
return false;
#ifdef PREAD_PWRITE
if ((written = pwrite(file->fil_desc, zeros().get(), to_write, LSEEK_OFFSET_CAST offset)) == to_write)
break;
#else
if ((written = write(file->fil_desc, zeros().get(), to_write)) == to_write)
break;
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (written == (SLONG) -1 && !SYSCALL_INTERRUPTED(errno))
return unix_error("write", file, isc_io_write_err, status_vector);
}
#ifndef PREAD_PWRITE
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
leftPages -= write_pages;
i += write_pages;
}
return (initPages - leftPages);
}
static int openFile(const char* name, bool forcedWrites, bool notUseFSCache, bool readOnly)
{
/**************************************
*
* o p e n F i l e
*
**************************************
*
* Functional description
* Open a file with appropriate flags.
*
**************************************/
int flag = O_BINARY | (readOnly ? O_RDONLY : O_RDWR);
#ifdef SUPERSERVER_V2
flag |= SYNC;
// what to do with O_DIRECT here ?
#else
if (forcedWrites) flag |= SYNC;
if (notUseFSCache) flag |= O_DIRECT;
#endif
for (int i = 0; i < IO_RETRY; i++)
{
int desc = open(name, flag);
if (desc != -1)
return desc;
if (!SYSCALL_INTERRUPTED(errno))
break;
}
return -1;
}
jrd_file* PIO_open(Database* dbb,
const Firebird::PathName& string,
bool trace_flag,
const Firebird::PathName& file_name,
bool /*share_delete*/)
{
/**************************************
*
* P I O _ o p e n
*
**************************************
*
* Functional description
* Open a database file.
*
**************************************/
const TEXT* ptr = (string.hasData() ? string : file_name).c_str();
int desc = openFile(ptr, false, false, false);
if (desc == -1) {
/* Try opening the database file in ReadOnly mode. The database file could
* be on a RO medium (CD-ROM etc.). If this fileopen fails, return error.
*/
desc = openFile(ptr, false, false, true);
if (desc == -1) {
ERR_post(isc_io_error,
isc_arg_string, "open",
isc_arg_cstring, file_name.length(), ERR_cstring(file_name),
isc_arg_gds, isc_io_open_err, isc_arg_unix, errno, 0);
}
else {
/* If this is the primary file, set Database flag to indicate that it is
* being opened ReadOnly. This flag will be used later to compare with
* the Header Page flag setting to make sure that the database is set
* ReadOnly.
*/
PageSpace* pageSpace = dbb->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
if (!pageSpace->file)
dbb->dbb_flags |= DBB_being_opened_read_only;
}
}
// posix_fadvise(desc, 0, 0, POSIX_FADV_RANDOM);
#ifdef SUPPORT_RAW_DEVICES
/* At this point the file has successfully been opened in either RW or RO
* mode. Check if it is a special file (i.e. raw block device) and if a
* valid database is on it. If not, return an error.
*/
if (raw_devices_check_file(file_name)
&& !raw_devices_validate_database(desc, file_name))
{
ERR_post (isc_io_error,
isc_arg_string, "open",
isc_arg_cstring, file_name.length(),
ERR_cstring (file_name),
isc_arg_gds, isc_io_open_err,
isc_arg_unix, ENOENT, 0);
}
#endif /* SUPPORT_RAW_DEVICES */
jrd_file *file;
try {
file = setup_file(dbb, string, desc);
}
catch (const Firebird::Exception&) {
close(desc);
throw;
}
return file;
}
bool PIO_read(jrd_file* file, BufferDesc* bdb, Ods::pag* page, ISC_STATUS* status_vector)
{
/**************************************
*
* P I O _ r e a d
*
**************************************
*
* Functional description
* Read a data page. Oh wow.
*
**************************************/
int i;
UINT64 bytes, offset;
SignalInhibit siHolder;
if (file->fil_desc == -1)
return unix_error("read", file, isc_io_read_err, status_vector);
Database* dbb = bdb->bdb_dbb;
const UINT64 size = dbb->dbb_page_size;
#ifdef ISC_DATABASE_ENCRYPTION
if (dbb->dbb_encrypt_key) {
SLONG spare_buffer[MAX_PAGE_SIZE / sizeof(SLONG)];
for (i = 0; i < IO_RETRY; i++) {
if (!(file = seek_file(file, bdb, &offset, status_vector)))
return false;
#ifdef PREAD_PWRITE
if ((bytes = pread (file->fil_desc, spare_buffer, size, LSEEK_OFFSET_CAST offset)) == size)
#else
if ((bytes = read(file->fil_desc, spare_buffer, size)) == size)
#endif
{
(*dbb->dbb_decrypt) (dbb->dbb_encrypt_key->str_data,
spare_buffer, size, page);
break;
}
#ifndef PREAD_PWRITE
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (bytes == -1U && !SYSCALL_INTERRUPTED(errno))
return unix_error("read", file, isc_io_read_err,
status_vector);
}
}
else
#endif /* ISC_DATABASE_ENCRYPTION */
{
for (i = 0; i < IO_RETRY; i++) {
if (!(file = seek_file(file, bdb, &offset, status_vector)))
return false;
#ifdef PREAD_PWRITE
if ((bytes = pread(file->fil_desc, page, size, LSEEK_OFFSET_CAST offset)) == size)
break;
#else
if ((bytes = read(file->fil_desc, page, size)) == size)
break;
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (bytes == -1U && !SYSCALL_INTERRUPTED(errno))
return unix_error("read", file, isc_io_read_err,
status_vector);
}
}
#ifndef PREAD_PWRITE
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (i == IO_RETRY) {
if (bytes == 0) {
#ifdef DEV_BUILD
fprintf(stderr, "PIO_read: an empty page read!\n");
fflush(stderr);
#endif
}
else {
#ifdef DEV_BUILD
fprintf(stderr, "PIO_read: retry count exceeded\n");
fflush(stderr);
#endif
unix_error("read_retry", file, isc_io_read_err, 0);
}
}
// posix_fadvise(file->desc, offset, size, POSIX_FADV_NOREUSE);
return true;
}
bool PIO_write(jrd_file* file, BufferDesc* bdb, Ods::pag* page, ISC_STATUS* status_vector)
{
/**************************************
*
* P I O _ w r i t e
*
**************************************
*
* Functional description
* Write a data page. Oh wow.
*
**************************************/
int i;
SLONG bytes;
UINT64 offset;
SignalInhibit siHolder;
if (file->fil_desc == -1)
return unix_error("write", file, isc_io_write_err, status_vector);
Database* dbb = bdb->bdb_dbb;
const SLONG size = dbb->dbb_page_size;
#ifdef ISC_DATABASE_ENCRYPTION
if (dbb->dbb_encrypt_key) {
SLONG spare_buffer[MAX_PAGE_SIZE / sizeof(SLONG)];
(*dbb->dbb_encrypt) (dbb->dbb_encrypt_key->str_data,
page, size, spare_buffer);
for (i = 0; i < IO_RETRY; i++) {
if (!(file = seek_file(file, bdb, &offset, status_vector)))
return false;
#ifdef PREAD_PWRITE
if ((bytes = pwrite(file->fil_desc, spare_buffer, size, LSEEK_OFFSET_CAST offset)) == size)
break;
#else
if ((bytes = write(file->fil_desc, spare_buffer, size)) == size)
break;
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (bytes == -1U && !SYSCALL_INTERRUPTED(errno))
return unix_error("write", file, isc_io_write_err,
status_vector);
}
}
else
#endif /* ISC_DATABASE_ENCRYPTION */
{
for (i = 0; i < IO_RETRY; i++) {
if (!(file = seek_file(file, bdb, &offset, status_vector)))
return false;
#ifdef PREAD_PWRITE
if ((bytes = pwrite(file->fil_desc, page, size, LSEEK_OFFSET_CAST offset)) == size)
break;
#else
if ((bytes = write(file->fil_desc, page, size)) == size)
break;
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
if (bytes == (SLONG) -1 && !SYSCALL_INTERRUPTED(errno))
return unix_error("write", file, isc_io_write_err,
status_vector);
}
}
#ifndef PREAD_PWRITE
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
#endif
// posix_fadvise(file->desc, offset, size, POSIX_FADV_DONTNEED);
return true;
}
static jrd_file* seek_file(jrd_file* file, BufferDesc* bdb, UINT64* offset,
ISC_STATUS* status_vector)
{
/**************************************
*
* s e e k _ f i l e
*
**************************************
*
* Functional description
* Given a buffer descriptor block, find the appropropriate
* file block and seek to the proper page in that file.
*
**************************************/
Database* dbb = bdb->bdb_dbb;
ULONG page = bdb->bdb_page.getPageNum();
for (;; file = file->fil_next)
{
if (!file) {
CORRUPT(158); /* msg 158 database file not available */
}
else if (page >= file->fil_min_page && page <= file->fil_max_page)
break;
}
if (file->fil_desc == -1)
{
unix_error("lseek", file, isc_io_access_err, status_vector);
return 0;
}
page -= file->fil_min_page - file->fil_fudge;
UINT64 lseek_offset = page;
lseek_offset *= dbb->dbb_page_size;
if (lseek_offset != (UINT64) LSEEK_OFFSET_CAST lseek_offset)
{
unix_error("lseek", file, isc_io_32bit_exceeded_err, status_vector);
return 0;
}
#ifdef PREAD_PWRITE
*offset = lseek_offset;
#else
THD_IO_MUTEX_LOCK(file->fil_mutex);
if ((lseek(file->fil_desc, LSEEK_OFFSET_CAST lseek_offset, 0)) == (off_t)-1)
{
THD_IO_MUTEX_UNLOCK(file->fil_mutex);
unix_error("lseek", file, isc_io_access_err, status_vector);
return 0;
}
#endif
return file;
}
static jrd_file* setup_file(Database* dbb, const Firebird::PathName& file_name, int desc)
{
/**************************************
*
* s e t u p _ f i l e
*
**************************************
*
* Functional description
* Set up file and lock blocks for a file.
*
**************************************/
/* Allocate file block and copy file name string */
jrd_file* file = FB_NEW_RPT(*dbb->dbb_permanent, file_name.length() + 1) jrd_file();
file->fil_desc = desc;
file->fil_length = file_name.length();
file->fil_max_page = -1UL;
MOVE_FAST(file_name.c_str(), file->fil_string, file_name.length());
file->fil_string[file_name.length()] = '\0';