1 /*
2 * falloc: ioengine for git://git.kernel.dk/fio.git
3 *
4 * IO engine that does regular fallocate to simulate data transfer
5 * as fio ioengine.
6 * DDIR_READ does fallocate(,mode = FALLOC_FL_KEEP_SIZE,)
7 * DDIR_WRITE does fallocate(,mode = 0) : fallocate with size extension
8 * DDIR_TRIM does fallocate(,mode = FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)
9 *
10 */
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <unistd.h>
14 #include <sys/uio.h>
15 #include <errno.h>
16 #include <assert.h>
17 #include <fcntl.h>
18
19 #include "../fio.h"
20 #include "../filehash.h"
21
22 /*
23 * generic_open_file is not appropriate because does not allow to perform
24 * TRIM in to file
25 */
open_file(struct thread_data * td,struct fio_file * f)26 static int open_file(struct thread_data *td, struct fio_file *f)
27 {
28 int from_hash = 0;
29
30 dprint(FD_FILE, "fd open %s\n", f->file_name);
31
32 if (f->filetype != FIO_TYPE_FILE) {
33 log_err("fio: only files are supported fallocate \n");
34 return 1;
35 }
36 if (!strcmp(f->file_name, "-")) {
37 log_err("fio: can't read/write to stdin/out\n");
38 return 1;
39 }
40
41 open_again:
42 from_hash = file_lookup_open(f, O_CREAT|O_RDWR);
43
44 if (f->fd == -1) {
45 char buf[FIO_VERROR_SIZE];
46 int e = errno;
47
48 snprintf(buf, sizeof(buf), "open(%s)", f->file_name);
49 td_verror(td, e, buf);
50 }
51
52 if (!from_hash && f->fd != -1) {
53 if (add_file_hash(f)) {
54 int fio_unused ret;
55
56 /*
57 * OK to ignore, we haven't done anything with it
58 */
59 ret = generic_close_file(td, f);
60 goto open_again;
61 }
62 }
63
64 return 0;
65 }
66
67 #ifndef FALLOC_FL_KEEP_SIZE
68 #define FALLOC_FL_KEEP_SIZE 0x01 /* default is extend size */
69 #endif
70 #ifndef FALLOC_FL_PUNCH_HOLE
71 #define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */
72 #endif
fio_fallocate_queue(struct thread_data * td,struct io_u * io_u)73 static int fio_fallocate_queue(struct thread_data *td, struct io_u *io_u)
74 {
75 struct fio_file *f = io_u->file;
76 int ret;
77 int flags = 0;
78
79 fio_ro_check(td, io_u);
80
81 if (io_u->ddir == DDIR_READ)
82 flags = FALLOC_FL_KEEP_SIZE;
83 else if (io_u->ddir == DDIR_WRITE)
84 flags = 0;
85 else if (io_u->ddir == DDIR_TRIM)
86 flags = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
87
88 ret = fallocate(f->fd, flags, io_u->offset, io_u->xfer_buflen);
89
90 if (ret)
91 io_u->error = errno;
92
93 return FIO_Q_COMPLETED;
94 }
95
96 static struct ioengine_ops ioengine = {
97 .name = "falloc",
98 .version = FIO_IOOPS_VERSION,
99 .queue = fio_fallocate_queue,
100 .open_file = open_file,
101 .close_file = generic_close_file,
102 .get_file_size = generic_get_file_size,
103 .flags = FIO_SYNCIO
104 };
105
fio_syncio_register(void)106 static void fio_init fio_syncio_register(void)
107 {
108 register_ioengine(&ioengine);
109 }
110
fio_syncio_unregister(void)111 static void fio_exit fio_syncio_unregister(void)
112 {
113 unregister_ioengine(&ioengine);
114 }
115