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 .lname = "Donor Name",
49 .type = FIO_OPT_STR_STORE,
50 .off1 = offsetof(struct e4defrag_options, donor_name),
51 .help = "File used as a block donor",
52 .category = FIO_OPT_C_ENGINE,
53 .group = FIO_OPT_G_E4DEFRAG,
59 .off1 = offsetof(struct e4defrag_options, inplace),
62 .help = "Alloc and free space inside defrag event",
63 .category = FIO_OPT_C_ENGINE,
64 .group = FIO_OPT_G_E4DEFRAG,
71 static int fio_e4defrag_init(struct thread_data *td)
74 struct e4defrag_options *o = td->eo;
75 struct e4defrag_data *ed;
77 char donor_name[PATH_MAX];
79 if (!strlen(o->donor_name)) {
80 log_err("'donorname' options required\n");
84 ed = malloc(sizeof(*ed));
86 td_verror(td, ENOMEM, "io_queue_init");
89 memset(ed, 0 ,sizeof(*ed));
92 len = sprintf(donor_name, "%s/", td->o.directory);
93 sprintf(donor_name + len, "%s", o->donor_name);
95 ed->donor_fd = open(donor_name, O_CREAT|O_WRONLY, 0644);
96 if (ed->donor_fd < 0) {
97 td_verror(td, errno, "io_queue_init");
98 log_err("Can't open donor file %s err:%d\n", donor_name, ed->donor_fd);
104 long long __len = td->o.file_size_high - td->o.start_offset;
105 r = fallocate(ed->donor_fd, 0, td->o.start_offset, __len);
109 r = fstat(ed->donor_fd, &stub);
113 ed->bsz = stub.st_blksize;
114 td->io_ops_data = ed;
117 td_verror(td, errno, "io_queue_init");
123 static void fio_e4defrag_cleanup(struct thread_data *td)
125 struct e4defrag_data *ed = td->io_ops_data;
127 if (ed->donor_fd >= 0)
134 static int fio_e4defrag_queue(struct thread_data *td, struct io_u *io_u)
138 unsigned long long len;
139 struct move_extent me;
140 struct fio_file *f = io_u->file;
141 struct e4defrag_data *ed = td->io_ops_data;
142 struct e4defrag_options *o = td->eo;
144 fio_ro_check(td, io_u);
146 /* Theoretically defragmentation should not change data, but it
147 * changes data layout. So this function handle only DDIR_WRITE
148 * in order to satisfy strict read only access pattern
150 if (io_u->ddir != DDIR_WRITE) {
151 io_u->error = EINVAL;
152 return FIO_Q_COMPLETED;
156 ret = fallocate(ed->donor_fd, 0, io_u->offset, io_u->xfer_buflen);
161 memset(&me, 0, sizeof(me));
162 me.donor_fd = ed->donor_fd;
163 me.orig_start = io_u->offset / ed->bsz;
164 me.donor_start = me.orig_start;
165 len = (io_u->offset + io_u->xfer_buflen + ed->bsz -1);
166 me.len = len / ed->bsz - me.orig_start;
168 ret = ioctl(f->fd, EXT4_IOC_MOVE_EXT, &me);
169 len = me.moved_len * ed->bsz;
171 if (len > io_u->xfer_buflen)
172 len = io_u->xfer_buflen;
174 if (len != io_u->xfer_buflen) {
175 io_u->resid = io_u->xfer_buflen - len;
182 ret = ftruncate(ed->donor_fd, 0);
184 if (ret && !io_u->error)
187 return FIO_Q_COMPLETED;
190 static struct ioengine_ops ioengine = {
192 .version = FIO_IOOPS_VERSION,
193 .init = fio_e4defrag_init,
194 .queue = fio_e4defrag_queue,
195 .open_file = generic_open_file,
196 .close_file = generic_close_file,
197 .get_file_size = generic_get_file_size,
199 .cleanup = fio_e4defrag_cleanup,
201 .option_struct_size = sizeof(struct e4defrag_options),
205 static void fio_init fio_syncio_register(void)
207 register_ioengine(&ioengine);
210 static void fio_exit fio_syncio_unregister(void)
212 unregister_ioengine(&ioengine);