| 1 | /* |
| 2 | * The io parts of the fio tool, includes workers for sync and mmap'ed |
| 3 | * io, as well as both posix and linux libaio support. |
| 4 | * |
| 5 | * sync io is implemented on top of aio. |
| 6 | * |
| 7 | * This is not really specific to fio, if the get_io_u/put_io_u and |
| 8 | * structures was pulled into this as well it would be a perfectly |
| 9 | * generic io engine that could be used for other projects. |
| 10 | * |
| 11 | */ |
| 12 | #include <stdio.h> |
| 13 | #include <stdlib.h> |
| 14 | #include <unistd.h> |
| 15 | #include <string.h> |
| 16 | #include <dlfcn.h> |
| 17 | #include "fio.h" |
| 18 | #include "os.h" |
| 19 | |
| 20 | struct ioengine_ops *load_ioengine(struct thread_data *td, char *name) |
| 21 | { |
| 22 | char engine[16], engine_lib[256]; |
| 23 | struct ioengine_ops *ops, *ret; |
| 24 | void *dlhandle; |
| 25 | |
| 26 | strcpy(engine, name); |
| 27 | |
| 28 | /* |
| 29 | * linux libaio has alias names, so convert to what we want |
| 30 | */ |
| 31 | if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3)) |
| 32 | strcpy(engine, "libaio"); |
| 33 | |
| 34 | sprintf(engine_lib, "%s/lib/fio/fio-engine-%s.o", fio_inst_prefix, engine); |
| 35 | dlerror(); |
| 36 | dlhandle = dlopen(engine_lib, RTLD_LAZY); |
| 37 | if (!dlhandle) { |
| 38 | td_vmsg(td, -1, dlerror()); |
| 39 | return NULL; |
| 40 | } |
| 41 | |
| 42 | ops = dlsym(dlhandle, "ioengine"); |
| 43 | if (!ops) { |
| 44 | td_vmsg(td, -1, dlerror()); |
| 45 | dlclose(dlhandle); |
| 46 | return NULL; |
| 47 | } |
| 48 | |
| 49 | if (ops->version != FIO_IOOPS_VERSION) { |
| 50 | log_err("bad ioops version %d (want %d)\n", ops->version, FIO_IOOPS_VERSION); |
| 51 | dlclose(dlhandle); |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | ret = malloc(sizeof(*ret)); |
| 56 | memcpy(ret, ops, sizeof(*ret)); |
| 57 | ret->data = NULL; |
| 58 | ret->dlhandle = dlhandle; |
| 59 | |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | void close_ioengine(struct thread_data *td) |
| 64 | { |
| 65 | if (td->io_ops->cleanup) |
| 66 | td->io_ops->cleanup(td); |
| 67 | |
| 68 | dlclose(td->io_ops->dlhandle); |
| 69 | free(td->io_ops); |
| 70 | td->io_ops = NULL; |
| 71 | } |
| 72 | |
| 73 | int td_io_prep(struct thread_data *td, struct io_u *io_u) |
| 74 | { |
| 75 | if (td->io_ops->prep && td->io_ops->prep(td, io_u)) |
| 76 | return 1; |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | int td_io_sync(struct thread_data *td, struct fio_file *f) |
| 82 | { |
| 83 | if (td->io_ops->sync) |
| 84 | return td->io_ops->sync(td, f); |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | int td_io_getevents(struct thread_data *td, int min, int max, |
| 90 | struct timespec *t) |
| 91 | { |
| 92 | return td->io_ops->getevents(td, min, max, t); |
| 93 | } |
| 94 | |
| 95 | int td_io_queue(struct thread_data *td, struct io_u *io_u) |
| 96 | { |
| 97 | gettimeofday(&io_u->issue_time, NULL); |
| 98 | |
| 99 | return td->io_ops->queue(td, io_u); |
| 100 | } |