2 * ioe_e4defrag: ioengine for git://git.kernel.dk/fio.git
4 * IO engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate
20 #include "../optgroup.h"
22 #ifndef EXT4_IOC_MOVE_EXT
23 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
25 __u32 reserved; /* should be zero */
26 __u32 donor_fd; /* donor file descriptor */
27 __u64 orig_start; /* logical start offset in block for orig */
28 __u64 donor_start; /* logical start offset in block for donor */
29 __u64 len; /* block length to be moved */
30 __u64 moved_len; /* moved block length */
34 struct e4defrag_data {
39 struct e4defrag_options {
45 static struct fio_option options[] = {
48 .type = FIO_OPT_STR_STORE,
49 .off1 = offsetof(struct e4defrag_options, donor_name),
50 .help = "File used as a block donor",
51 .category = FIO_OPT_C_ENGINE,
52 .group = FIO_OPT_G_E4DEFRAG,
57 .off1 = offsetof(struct e4defrag_options, inplace),
60 .help = "Alloc and free space inside defrag event",
61 .category = FIO_OPT_C_ENGINE,
62 .group = FIO_OPT_G_E4DEFRAG,
69 static int fio_e4defrag_init(struct thread_data *td)
72 struct e4defrag_options *o = td->eo;
73 struct e4defrag_data *ed;
75 char donor_name[PATH_MAX];
77 if (!strlen(o->donor_name)) {
78 log_err("'donorname' options required\n");
82 ed = malloc(sizeof(*ed));
84 td_verror(td, ENOMEM, "io_queue_init");
87 memset(ed, 0 ,sizeof(*ed));
90 len = sprintf(donor_name, "%s/", td->o.directory);
91 sprintf(donor_name + len, "%s", o->donor_name);
93 ed->donor_fd = open(donor_name, O_CREAT|O_WRONLY, 0644);
94 if (ed->donor_fd < 0) {
95 td_verror(td, errno, "io_queue_init");
96 log_err("Can't open donor file %s err:%d", donor_name, ed->donor_fd);
102 long long __len = td->o.file_size_high - td->o.start_offset;
103 r = fallocate(ed->donor_fd, 0, td->o.start_offset, __len);
107 r = fstat(ed->donor_fd, &stub);
111 ed->bsz = stub.st_blksize;
112 td->io_ops_data = ed;
115 td_verror(td, errno, "io_queue_init");
121 static void fio_e4defrag_cleanup(struct thread_data *td)
123 struct e4defrag_data *ed = td->io_ops_data;
125 if (ed->donor_fd >= 0)
132 static int fio_e4defrag_queue(struct thread_data *td, struct io_u *io_u)
136 unsigned long long len;
137 struct move_extent me;
138 struct fio_file *f = io_u->file;
139 struct e4defrag_data *ed = td->io_ops_data;
140 struct e4defrag_options *o = td->eo;
142 fio_ro_check(td, io_u);
144 /* Theoretically defragmentation should not change data, but it
145 * changes data layout. So this function handle only DDIR_WRITE
146 * in order to satisfy strict read only access pattern
148 if (io_u->ddir != DDIR_WRITE) {
149 io_u->error = EINVAL;
150 return FIO_Q_COMPLETED;
154 ret = fallocate(ed->donor_fd, 0, io_u->offset, io_u->xfer_buflen);
159 memset(&me, 0, sizeof(me));
160 me.donor_fd = ed->donor_fd;
161 me.orig_start = io_u->offset / ed->bsz;
162 me.donor_start = me.orig_start;
163 len = (io_u->offset + io_u->xfer_buflen + ed->bsz -1);
164 me.len = len / ed->bsz - me.orig_start;
166 ret = ioctl(f->fd, EXT4_IOC_MOVE_EXT, &me);
167 len = me.moved_len * ed->bsz;
169 if (len > io_u->xfer_buflen)
170 len = io_u->xfer_buflen;
172 if (len != io_u->xfer_buflen) {
173 io_u->resid = io_u->xfer_buflen - len;
180 ret = ftruncate(ed->donor_fd, 0);
182 if (ret && !io_u->error)
185 return FIO_Q_COMPLETED;
188 static struct ioengine_ops ioengine = {
190 .version = FIO_IOOPS_VERSION,
191 .init = fio_e4defrag_init,
192 .queue = fio_e4defrag_queue,
193 .open_file = generic_open_file,
194 .close_file = generic_close_file,
195 .get_file_size = generic_get_file_size,
197 .cleanup = fio_e4defrag_cleanup,
199 .option_struct_size = sizeof(struct e4defrag_options),
203 static void fio_init fio_syncio_register(void)
205 register_ioengine(&ioengine);
208 static void fio_exit fio_syncio_unregister(void)
210 unregister_ioengine(&ioengine);