projects / fio.git / blame
| Commit | Line | Data |
|---|---|---|
| e615ceaf DM |
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,) | |
| de8f6de9 | 7 | * DDIR_WRITE does fallocate(,mode = 0) : fallocate with size extension |
| e615ceaf DM |
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 | */ | |
| 10aa136b | 26 | static int open_file(struct thread_data *td, struct fio_file *f) |
| e615ceaf DM |
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]; | |
| 0b783341 JA |
46 | int e = errno; |
| 47 | ||
| 98ffb8f3 | 48 | snprintf(buf, sizeof(buf), "open(%s)", f->file_name); |
| 0b783341 | 49 | td_verror(td, e, buf); |
| e615ceaf DM |
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 | |
| 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 | ||
| e12d2800 | 90 | if (ret) |
| e615ceaf | 91 | io_u->error = errno; |
| e615ceaf | 92 | |
| e615ceaf DM |
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 | ||
| 106 | static void fio_init fio_syncio_register(void) | |
| 107 | { | |
| 108 | register_ioengine(&ioengine); | |
| 109 | } | |
| 110 | ||
| 111 | static void fio_exit fio_syncio_unregister(void) | |
| 112 | { | |
| 113 | unregister_ioengine(&ioengine); | |
| 114 | } |