1 /* src/include/port/linux.h */ 2 3 /* 4 * As of July 2007, all known versions of the Linux kernel will sometimes 5 * return EIDRM for a shmctl() operation when EINVAL is correct (it happens 6 * when the low-order 15 bits of the supplied shm ID match the slot number 7 * assigned to a newer shmem segment). We deal with this by assuming that 8 * EIDRM means EINVAL in PGSharedMemoryIsInUse(). This is reasonably safe 9 * since in fact Linux has no excuse for ever returning EIDRM; it doesn't 10 * track removed segments in a way that would allow distinguishing them from 11 * private ones. But someday that code might get upgraded, and we'd have 12 * to have a kernel version test here. 13 */ 14 #define HAVE_LINUX_EIDRM_BUG 15 16 /* 17 * Set the default wal_sync_method to fdatasync. With recent Linux versions, 18 * xlogdefs.h's normal rules will prefer open_datasync, which (a) doesn't 19 * perform better and (b) causes outright failures on ext4 data=journal 20 * filesystems, because those don't support O_DIRECT. 21 */ 22 #define PLATFORM_DEFAULT_SYNC_METHOD SYNC_METHOD_FDATASYNC 23