BIO_RW_DISCARD    180 include/linux/bio.h #define bio_discard(bio)	((bio)->bi_rw & (1 << BIO_RW_DISCARD))
BIO_RW_DISCARD    206 include/linux/blktrace_api.h 		rw |= (1 << BIO_RW_DISCARD);
BIO_RW_DISCARD     90 include/linux/fs.h #define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD)
BIO_RW_DISCARD     91 include/linux/fs.h #define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER))