Dmitry Monakhov | e615cea | 2012-09-19 23:22:55 +0400 | [diff] [blame] | 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 extention |
| 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 | */ |
| 26 | 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; |
Ken Raeburn | 98ffb8f | 2013-01-30 22:31:09 +0100 | [diff] [blame] | 47 | snprintf(buf, sizeof(buf), "open(%s)", f->file_name); |
Dmitry Monakhov | e615cea | 2012-09-19 23:22:55 +0400 | [diff] [blame] | 48 | td_verror(td, __e, buf); |
| 49 | } |
| 50 | |
| 51 | if (!from_hash && f->fd != -1) { |
| 52 | if (add_file_hash(f)) { |
| 53 | int fio_unused ret; |
| 54 | |
| 55 | /* |
| 56 | * OK to ignore, we haven't done anything with it |
| 57 | */ |
| 58 | ret = generic_close_file(td, f); |
| 59 | goto open_again; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | #ifndef FALLOC_FL_KEEP_SIZE |
| 67 | #define FALLOC_FL_KEEP_SIZE 0x01 /* default is extend size */ |
| 68 | #endif |
| 69 | #ifndef FALLOC_FL_PUNCH_HOLE |
| 70 | #define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */ |
| 71 | #endif |
| 72 | static int fio_fallocate_queue(struct thread_data *td, struct io_u *io_u) |
| 73 | { |
| 74 | struct fio_file *f = io_u->file; |
| 75 | int ret; |
| 76 | int flags = 0; |
| 77 | |
| 78 | fio_ro_check(td, io_u); |
| 79 | |
| 80 | if (io_u->ddir == DDIR_READ) |
| 81 | flags = FALLOC_FL_KEEP_SIZE; |
| 82 | else if (io_u->ddir == DDIR_WRITE) |
| 83 | flags = 0; |
| 84 | else if (io_u->ddir == DDIR_TRIM) |
| 85 | flags = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; |
| 86 | |
| 87 | ret = fallocate(f->fd, flags, io_u->offset, io_u->xfer_buflen); |
| 88 | |
Dmitry Monakhov | e12d280 | 2012-09-23 21:49:53 +0400 | [diff] [blame] | 89 | if (ret) |
Dmitry Monakhov | e615cea | 2012-09-19 23:22:55 +0400 | [diff] [blame] | 90 | io_u->error = errno; |
Dmitry Monakhov | e615cea | 2012-09-19 23:22:55 +0400 | [diff] [blame] | 91 | |
Dmitry Monakhov | e615cea | 2012-09-19 23:22:55 +0400 | [diff] [blame] | 92 | return FIO_Q_COMPLETED; |
| 93 | } |
| 94 | |
| 95 | static struct ioengine_ops ioengine = { |
| 96 | .name = "falloc", |
| 97 | .version = FIO_IOOPS_VERSION, |
| 98 | .queue = fio_fallocate_queue, |
| 99 | .open_file = open_file, |
| 100 | .close_file = generic_close_file, |
| 101 | .get_file_size = generic_get_file_size, |
| 102 | .flags = FIO_SYNCIO |
| 103 | }; |
| 104 | |
| 105 | static void fio_init fio_syncio_register(void) |
| 106 | { |
| 107 | register_ioengine(&ioengine); |
| 108 | } |
| 109 | |
| 110 | static void fio_exit fio_syncio_unregister(void) |
| 111 | { |
| 112 | unregister_ioengine(&ioengine); |
| 113 | } |