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While doing a transaction comment, use fdatasync() instead of fsync() in

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cases there the file size is unchanged. (CVS 2673)

FossilOrigin-Name: 3c555a87493128620ac967faf7c63c2a58856e9e
This commit is contained in:
drh
2005-09-08 12:38:41 +00:00
parent f80bcd73af
commit eb796a7c8f
8 changed files with 35 additions and 26 deletions
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18
src/os_unix.c
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@@ -797,7 +797,7 @@ int sqlite3_fullsync_count = 0;
** enabled, however, since with SQLITE_NO_SYNC enabled, an OS crash
** or power failure will likely corrupt the database file.
*/
static int full_fsync(int fd, int fullSync){
static int full_fsync(int fd, int fullSync, int dataOnly){
int rc;
/* Record the number of times that we do a normal fsync() and
@@ -826,7 +826,11 @@ static int full_fsync(int fd, int fullSync){
if( rc ) rc = fsync(fd);
#else
rc = fsync(fd);
if( dataOnly ){
rc = fdatasync(fd);
}else{
rc = fsync(fd);
}
#endif /* defined(F_FULLFSYNC) */
#endif /* defined(SQLITE_NO_SYNC) */
@@ -836,6 +840,10 @@ static int full_fsync(int fd, int fullSync){
/*
** Make sure all writes to a particular file are committed to disk.
**
** If dataOnly==0 then both the file itself and its metadata (file
** size, access time, etc) are synced. If dataOnly!=0 then only the
** file data is synced.
**
** Under Unix, also make sure that the directory entry for the file
** has been created by fsync-ing the directory that contains the file.
** If we do not do this and we encounter a power failure, the directory
@@ -844,16 +852,16 @@ static int full_fsync(int fd, int fullSync){
** the directory entry for the journal was never created) and the transaction
** will not roll back - possibly leading to database corruption.
*/
int sqlite3OsSync(OsFile *id){
int sqlite3OsSync(OsFile *id, int dataOnly){
assert( id->isOpen );
SimulateIOError(SQLITE_IOERR);
TRACE2("SYNC %-3d\n", id->h);
if( full_fsync(id->h, id->fullSync) ){
if( full_fsync(id->h, id->fullSync, dataOnly) ){
return SQLITE_IOERR;
}
if( id->dirfd>=0 ){
TRACE2("DIRSYNC %-3d\n", id->dirfd);
full_fsync(id->dirfd, id->fullSync);
full_fsync(id->dirfd, id->fullSync, 0);
close(id->dirfd); /* Only need to sync once, so close the directory */
id->dirfd = -1; /* when we are done. */
}