| 1 | /* |
| 2 | * TRIM/DISCARD support |
| 3 | */ |
| 4 | #include <unistd.h> |
| 5 | #include <fcntl.h> |
| 6 | #include <string.h> |
| 7 | #include <assert.h> |
| 8 | #include <pthread.h> |
| 9 | |
| 10 | #include "fio.h" |
| 11 | #include "trim.h" |
| 12 | |
| 13 | #ifdef FIO_HAVE_TRIM |
| 14 | bool get_next_trim(struct thread_data *td, struct io_u *io_u) |
| 15 | { |
| 16 | struct io_piece *ipo; |
| 17 | |
| 18 | /* |
| 19 | * this io_u is from a requeue, we already filled the offsets |
| 20 | */ |
| 21 | if (io_u->file) |
| 22 | return true; |
| 23 | if (flist_empty(&td->trim_list)) |
| 24 | return false; |
| 25 | |
| 26 | assert(td->trim_entries); |
| 27 | ipo = flist_first_entry(&td->trim_list, struct io_piece, trim_list); |
| 28 | remove_trim_entry(td, ipo); |
| 29 | |
| 30 | io_u->offset = ipo->offset; |
| 31 | io_u->buflen = ipo->len; |
| 32 | io_u->file = ipo->file; |
| 33 | |
| 34 | /* |
| 35 | * If not verifying that trimmed ranges return zeroed data, |
| 36 | * remove this from the to-read verify lists |
| 37 | */ |
| 38 | if (!td->o.trim_zero) { |
| 39 | if (ipo->flags & IP_F_ONLIST) |
| 40 | flist_del(&ipo->list); |
| 41 | else { |
| 42 | assert(ipo->flags & IP_F_ONRB); |
| 43 | rb_erase(&ipo->rb_node, &td->io_hist_tree); |
| 44 | } |
| 45 | td->io_hist_len--; |
| 46 | free(ipo); |
| 47 | } else |
| 48 | ipo->flags |= IP_F_TRIMMED; |
| 49 | |
| 50 | if (!fio_file_open(io_u->file)) { |
| 51 | int r = td_io_open_file(td, io_u->file); |
| 52 | |
| 53 | if (r) { |
| 54 | dprint(FD_VERIFY, "failed file %s open\n", |
| 55 | io_u->file->file_name); |
| 56 | return false; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | get_file(io_u->file); |
| 61 | assert(fio_file_open(io_u->file)); |
| 62 | io_u->ddir = DDIR_TRIM; |
| 63 | io_u->xfer_buf = NULL; |
| 64 | io_u->xfer_buflen = io_u->buflen; |
| 65 | |
| 66 | dprint(FD_VERIFY, "get_next_trim: ret io_u %p\n", io_u); |
| 67 | return true; |
| 68 | } |
| 69 | |
| 70 | bool io_u_should_trim(struct thread_data *td, struct io_u *io_u) |
| 71 | { |
| 72 | unsigned long long val; |
| 73 | uint64_t frand_max; |
| 74 | unsigned long r; |
| 75 | |
| 76 | if (!td->o.trim_percentage) |
| 77 | return false; |
| 78 | |
| 79 | frand_max = rand_max(&td->trim_state); |
| 80 | r = __rand(&td->trim_state); |
| 81 | val = (frand_max / 100ULL); |
| 82 | |
| 83 | val *= (unsigned long long) td->o.trim_percentage; |
| 84 | return r <= val; |
| 85 | } |
| 86 | #endif |