Dmitry Monakhov | 9c25d2e | 2012-09-19 23:22:56 +0400 | [diff] [blame^] | 1 | /* |
| 2 | * ioe_e4defrag: ioengine for git://git.kernel.dk/fio.git |
| 3 | * |
| 4 | * IO engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate |
| 5 | * defragment activity |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #include <sys/types.h> |
| 10 | #include <sys/stat.h> |
| 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 | |
| 21 | #ifndef EXT4_IOC_MOVE_EXT |
| 22 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) |
| 23 | struct move_extent { |
| 24 | __u32 reserved; /* should be zero */ |
| 25 | __u32 donor_fd; /* donor file descriptor */ |
| 26 | __u64 orig_start; /* logical start offset in block for orig */ |
| 27 | __u64 donor_start; /* logical start offset in block for donor */ |
| 28 | __u64 len; /* block length to be moved */ |
| 29 | __u64 moved_len; /* moved block length */ |
| 30 | }; |
| 31 | #endif |
| 32 | |
| 33 | struct e4defrag_data { |
| 34 | int donor_fd; |
| 35 | int bsz; |
| 36 | }; |
| 37 | |
| 38 | struct e4defrag_options { |
| 39 | struct thread_data *td; |
| 40 | unsigned int inplace; |
| 41 | char * donor_name; |
| 42 | }; |
| 43 | |
| 44 | static struct fio_option options[] = { |
| 45 | { |
| 46 | .name = "donorname", |
| 47 | .type = FIO_OPT_STR_STORE, |
| 48 | .off1 = offsetof(struct e4defrag_options, donor_name), |
| 49 | .help = "File used as a block donor", |
| 50 | }, |
| 51 | { |
| 52 | .name = "inplace", |
| 53 | .type = FIO_OPT_INT, |
| 54 | .off1 = offsetof(struct e4defrag_options, inplace), |
| 55 | .minval = 0, |
| 56 | .maxval = 1, |
| 57 | .help = "Alloc and free space inside defrag event", |
| 58 | }, |
| 59 | { |
| 60 | .name = NULL, |
| 61 | }, |
| 62 | }; |
| 63 | |
| 64 | static int fio_e4defrag_init(struct thread_data *td) |
| 65 | { |
| 66 | int r, len = 0; |
| 67 | struct e4defrag_options *o = td->eo; |
| 68 | struct e4defrag_data *ed; |
| 69 | struct stat stub; |
| 70 | char donor_name[PATH_MAX]; |
| 71 | |
| 72 | if (!strlen(o->donor_name)) { |
| 73 | log_err("'donorname' options required\n"); |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | ed = malloc(sizeof(*ed)); |
| 78 | if (!ed) { |
| 79 | td_verror(td, -ENOMEM, "io_queue_init"); |
| 80 | return 1; |
| 81 | } |
| 82 | memset(ed, 0 ,sizeof(*ed)); |
| 83 | |
| 84 | if (td->o.directory) |
| 85 | len = sprintf(donor_name, "%s/", td->o.directory); |
| 86 | sprintf(donor_name + len, "%s", o->donor_name); |
| 87 | |
| 88 | ed->donor_fd = open(donor_name, O_CREAT|O_WRONLY, 0644); |
| 89 | if (ed->donor_fd < 0) { |
| 90 | td_verror(td, ed->donor_fd, "io_queue_init"); |
| 91 | log_err("Can't open donor file %s err:%d", ed->donor_fd); |
| 92 | free(ed); |
| 93 | return 1; |
| 94 | } |
| 95 | |
| 96 | if (!o->inplace) { |
| 97 | long long len = td->o.file_size_high - td->o.start_offset; |
| 98 | r = fallocate(ed->donor_fd, 0, td->o.start_offset, len); |
| 99 | if (r) |
| 100 | goto err; |
| 101 | } |
| 102 | r = fstat(ed->donor_fd, &stub); |
| 103 | if (r) |
| 104 | goto err; |
| 105 | |
| 106 | ed->bsz = stub.st_blksize; |
| 107 | td->io_ops->data = ed; |
| 108 | return 0; |
| 109 | err: |
| 110 | td_verror(td, errno, "io_queue_init"); |
| 111 | close(ed->donor_fd); |
| 112 | free(ed); |
| 113 | return 1; |
| 114 | } |
| 115 | |
| 116 | static void fio_e4defrag_cleanup(struct thread_data *td) |
| 117 | { |
| 118 | struct e4defrag_data *ed = td->io_ops->data; |
| 119 | if (ed) { |
| 120 | if (ed->donor_fd >= 0) |
| 121 | close(ed->donor_fd); |
| 122 | free(ed); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | |
| 127 | static int fio_e4defrag_queue(struct thread_data *td, struct io_u *io_u) |
| 128 | { |
| 129 | |
| 130 | int ret; |
| 131 | unsigned long long len; |
| 132 | struct move_extent me; |
| 133 | struct fio_file *f = io_u->file; |
| 134 | struct e4defrag_data *ed = td->io_ops->data; |
| 135 | struct e4defrag_options *o = td->eo; |
| 136 | |
| 137 | fio_ro_check(td, io_u); |
| 138 | |
| 139 | /* Theoretically defragmentation should not change data, but it |
| 140 | * changes data layout. So this function handle only DDIR_WRITE |
| 141 | * in order to satisfy strict read only access pattern |
| 142 | */ |
| 143 | if (io_u->ddir != DDIR_WRITE) { |
| 144 | io_u->error = errno; |
| 145 | return FIO_Q_COMPLETED; |
| 146 | } |
| 147 | |
| 148 | if (o->inplace) { |
| 149 | ret = fallocate(ed->donor_fd, 0, io_u->offset, io_u->xfer_buflen); |
| 150 | if (ret) { |
| 151 | io_u->error = errno; |
| 152 | goto out; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | memset(&me, 0, sizeof(me)); |
| 157 | me.donor_fd = ed->donor_fd; |
| 158 | me.orig_start = io_u->offset / ed->bsz; |
| 159 | me.donor_start = me.orig_start; |
| 160 | len = (io_u->offset + io_u->xfer_buflen + ed->bsz -1); |
| 161 | me.len = len / ed->bsz - me.orig_start; |
| 162 | |
| 163 | ret = ioctl(f->fd, EXT4_IOC_MOVE_EXT, &me); |
| 164 | len = me.moved_len * ed->bsz; |
| 165 | |
| 166 | if (io_u->file && len >= 0 && ddir_rw(io_u->ddir)) |
| 167 | io_u->file->file_pos = io_u->offset + len; |
| 168 | |
| 169 | if (len > io_u->xfer_buflen) |
| 170 | len = io_u->xfer_buflen; |
| 171 | |
| 172 | if (len != io_u->xfer_buflen) { |
| 173 | io_u->resid = io_u->xfer_buflen - len; |
| 174 | io_u->error = 0; |
| 175 | } |
| 176 | if (ret) |
| 177 | io_u->error = errno; |
| 178 | |
| 179 | if (o->inplace) { |
| 180 | ret = ftruncate(ed->donor_fd, 0); |
| 181 | if (ret) |
| 182 | io_u->error = errno; |
| 183 | } |
| 184 | out: |
| 185 | if (io_u->error) |
| 186 | td_verror(td, errno, "xfer"); |
| 187 | |
| 188 | |
| 189 | return FIO_Q_COMPLETED; |
| 190 | } |
| 191 | |
| 192 | static struct ioengine_ops ioengine = { |
| 193 | .name = "e4defrag", |
| 194 | .version = FIO_IOOPS_VERSION, |
| 195 | .init = fio_e4defrag_init, |
| 196 | .queue = fio_e4defrag_queue, |
| 197 | .open_file = generic_open_file, |
| 198 | .close_file = generic_close_file, |
| 199 | .get_file_size = generic_get_file_size, |
| 200 | .flags = FIO_SYNCIO, |
| 201 | .cleanup = fio_e4defrag_cleanup, |
| 202 | .options = options, |
| 203 | .option_struct_size = sizeof(struct e4defrag_options), |
| 204 | |
| 205 | }; |
| 206 | |
| 207 | static void fio_init fio_syncio_register(void) |
| 208 | { |
| 209 | register_ioengine(&ioengine); |
| 210 | } |
| 211 | |
| 212 | static void fio_exit fio_syncio_unregister(void) |
| 213 | { |
| 214 | unregister_ioengine(&ioengine); |
| 215 | } |