/**
* for truncate, we uses [size, EOF) to judge whether
* a write intent needs to be send, but we need to
- * restore the write extent to [0, size).
+ * restore the write extent to [0, size], in truncate,
+ * the byte in the size position is accessed.
*/
io->ci_write_intent.e_start = 0;
io->ci_write_intent.e_end =
- io->u.ci_setattr.sa_attr.lvb_size;
+ io->u.ci_setattr.sa_attr.lvb_size + 1;
}
/* stop cl_io_init() loop */
RETURN(1);
break;
}
+ case CIT_LSEEK: {
+ lio->lis_pos = io->u.ci_lseek.ls_start;
+ lio->lis_endpos = OBD_OBJECT_EOF;
+ break;
+ }
+
case CIT_GLIMPSE:
lio->lis_pos = 0;
lio->lis_endpos = OBD_OBJECT_EOF;
io->u.ci_ladvise.li_flags = parent->u.ci_ladvise.li_flags;
break;
}
+ case CIT_LSEEK: {
+ io->u.ci_lseek.ls_start = start;
+ io->u.ci_lseek.ls_whence = parent->u.ci_lseek.ls_whence;
+ io->u.ci_lseek.ls_result = parent->u.ci_lseek.ls_result;
+ break;
+ }
case CIT_GLIMPSE:
case CIT_MISC:
default:
RETURN_EXIT;
}
+static void lov_io_lseek_end(const struct lu_env *env,
+ const struct cl_io_slice *ios)
+{
+ struct lov_io *lio = cl2lov_io(env, ios);
+ struct cl_io *io = lio->lis_cl.cis_io;
+ struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
+ struct lov_io_sub *sub;
+ loff_t offset = -ENXIO;
+ bool seek_hole = io->u.ci_lseek.ls_whence == SEEK_HOLE;
+
+ ENTRY;
+
+ list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
+ struct cl_io *subio = &sub->sub_io;
+ int index = lov_comp_entry(sub->sub_subio_index);
+ int stripe = lov_comp_stripe(sub->sub_subio_index);
+ loff_t sub_off, lov_off;
+
+ lov_io_end_wrapper(sub->sub_env, subio);
+
+ if (io->ci_result == 0)
+ io->ci_result = sub->sub_io.ci_result;
+
+ if (io->ci_result)
+ continue;
+
+ CDEBUG(D_INFO, DFID": entry %x stripe %u: SEEK_%s from %lld\n",
+ PFID(lu_object_fid(lov2lu(lio->lis_object))),
+ index, stripe, seek_hole ? "HOLE" : "DATA",
+ subio->u.ci_lseek.ls_start);
+
+ /* first subio with positive result is what we need */
+ sub_off = subio->u.ci_lseek.ls_result;
+ /* Expected error, offset is out of stripe file size */
+ if (sub_off == -ENXIO)
+ continue;
+ /* Any other errors are not expected with ci_result == 0 */
+ if (sub_off < 0) {
+ CDEBUG(D_INFO, "unexpected error: rc = %lld\n",
+ sub_off);
+ io->ci_result = sub_off;
+ continue;
+ }
+ lov_off = lov_stripe_size(lsm, index, sub_off + 1, stripe) - 1;
+ if (lov_off < 0) {
+ /* the only way to get negatove lov_off here is too big
+ * result. Return -EOVERFLOW then.
+ */
+ io->ci_result = -EOVERFLOW;
+ CDEBUG(D_INFO, "offset %llu is too big: rc = %d\n",
+ (u64)lov_off, io->ci_result);
+ continue;
+ }
+ if (lov_off < io->u.ci_lseek.ls_start) {
+ io->ci_result = -EINVAL;
+ CDEBUG(D_INFO, "offset %lld < start %lld: rc = %d\n",
+ sub_off, io->u.ci_lseek.ls_start, io->ci_result);
+ continue;
+ }
+ /* resulting offset can be out of component range if stripe
+ * object is full and its file size was returned as virtual
+ * hole start. Skip this result, the next component will give
+ * us correct lseek result.
+ */
+ if (lov_off >= lsm->lsm_entries[index]->lsme_extent.e_end)
+ continue;
+
+ CDEBUG(D_INFO, "SEEK_%s: %lld->%lld/%lld: rc = %d\n",
+ seek_hole ? "HOLE" : "DATA",
+ subio->u.ci_lseek.ls_start, sub_off, lov_off,
+ sub->sub_io.ci_result);
+ offset = min_t(__u64, offset, lov_off);
+ }
+ io->u.ci_lseek.ls_result = offset;
+ RETURN_EXIT;
+}
+
static const struct cl_io_operations lov_io_ops = {
.op = {
[CIT_READ] = {
.cio_start = lov_io_start,
.cio_end = lov_io_end
},
+ [CIT_LSEEK] = {
+ .cio_fini = lov_io_fini,
+ .cio_iter_init = lov_io_iter_init,
+ .cio_iter_fini = lov_io_iter_fini,
+ .cio_lock = lov_io_lock,
+ .cio_unlock = lov_io_unlock,
+ .cio_start = lov_io_start,
+ .cio_end = lov_io_lseek_end
+ },
[CIT_GLIMPSE] = {
.cio_fini = lov_io_fini,
},
break;
case CIT_FSYNC:
case CIT_LADVISE:
+ case CIT_LSEEK:
case CIT_SETATTR:
case CIT_DATA_VERSION:
result = +1;
case CIT_READ:
case CIT_WRITE:
case CIT_FAULT:
+ case CIT_LSEEK:
io->ci_restore_needed = 1;
result = -ENODATA;
break;