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Code Issues Releases Activity

use posix_fallocate on linux SERVER-1057

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This commit is contained in:
Eliot Horowitz 2010-04-27 13:18:51 -04:00
parent 23bfd4eaac
commit 3f8a0d553a
1 changed files with 41 additions and 26 deletions
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67
util/file_allocator.h
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@ -106,6 +106,37 @@ namespace mongo {
#endif
}
static void ensureLength( int fd , long size ){
#if defined(__linux__)
posix_fallocate(fd,0,size);
#else
off_t filelen = lseek(fd, 0, SEEK_END);
if ( filelen < size ) {
massert( 10440 , "failure creating new datafile", filelen == 0 );
// Check for end of disk.
massert( 10441 , "Unable to allocate file of desired size",
size - 1 == lseek(fd, size - 1, SEEK_SET) );
massert( 10442 , "Unable to allocate file of desired size",
1 == write(fd, "", 1) );
lseek(fd, 0, SEEK_SET);
long z = 256 * 1024;
char buf[z];
memset(buf, 0, z);
long left = size;
while ( left > 0 ) {
long towrite = left;
if ( towrite > z )
towrite = z;
int written = write( fd , buf , towrite );
massert( 10443 , errnoWithPrefix("write failed" ), written > 0 );
left -= written;
}
}
#endif
}
private:
#if !defined(_WIN32)
void checkFailure() {
@ -170,33 +201,17 @@ namespace mongo {
log() << "warning: posix_fadvise fails " << name << ' ' << errnoWithDescription() << endl;
}
#endif
Timer t;
/* make sure the file is the full desired length */
off_t filelen = lseek(fd, 0, SEEK_END);
if ( filelen < size ) {
massert( 10440 , "failure creating new datafile", filelen == 0 );
// Check for end of disk.
massert( 10441 , "Unable to allocate file of desired size",
size - 1 == lseek(fd, size - 1, SEEK_SET) );
massert( 10442 , "Unable to allocate file of desired size",
1 == write(fd, "", 1) );
lseek(fd, 0, SEEK_SET);
Timer t;
long z = 256 * 1024;
char buf[z];
memset(buf, 0, z);
long left = size;
while ( left > 0 ) {
long towrite = left;
if ( towrite > z )
towrite = z;
int written = write( fd , buf , towrite );
massert( 10443 , errnoWithPrefix("write failed" ), written > 0 );
left -= written;
}
log() << "done allocating datafile " << name << ", size: " << size/1024/1024 << "MB, took " << ((double)t.millis())/1000.0 << " secs" << endl;
}
ensureLength( fd , size );
log() << "done allocating datafile " << name << ", "
<< "size: " << size/1024/1024 << "MB, "
<< " took " << ((double)t.millis())/1000.0 << " secs"
<< endl;
close( fd );
} catch ( ... ) {