Merge branch 'master' of https://github.com/dublio/fio
[fio.git] / trim.c
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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
917c64b3 14bool get_next_trim(struct thread_data *td, struct io_u *io_u)
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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)
917c64b3 22 return true;
0d29de83 23 if (flist_empty(&td->trim_list))
917c64b3 24 return false;
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25
26 assert(td->trim_entries);
9342d5f8 27 ipo = flist_first_entry(&td->trim_list, struct io_piece, trim_list);
0d29de83 28 remove_trim_entry(td, ipo);
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29
30 io_u->offset = ipo->offset;
31 io_u->buflen = ipo->len;
32 io_u->file = ipo->file;
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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--;
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46 free(ipo);
47 } else
48 ipo->flags |= IP_F_TRIMMED;
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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);
917c64b3 56 return false;
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57 }
58 }
59
a917a8b3 60 get_file(io_u->file);
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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
0d29de83 66 dprint(FD_VERIFY, "get_next_trim: ret io_u %p\n", io_u);
917c64b3 67 return true;
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68}
69
917c64b3 70bool io_u_should_trim(struct thread_data *td, struct io_u *io_u)
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71{
72 unsigned long long val;
c3546b53 73 uint64_t frand_max;
1294c3ec 74 unsigned long r;
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75
76 if (!td->o.trim_percentage)
917c64b3 77 return false;
0d29de83 78
c3546b53 79 frand_max = rand_max(&td->trim_state);
d6b72507 80 r = __rand(&td->trim_state);
c3546b53 81 val = (frand_max / 100ULL);
0d29de83 82
4c07ad86 83 val *= (unsigned long long) td->o.trim_percentage;
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84 return r <= val;
85}
86#endif