* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2016, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
EXIT;
}
+static inline bool
+is_index_within_mirror(struct lov_object *lov, int index, int mirror_index)
+{
+ struct lov_layout_composite *comp = &lov->u.composite;
+ struct lov_mirror_entry *lre = &comp->lo_mirrors[mirror_index];
+
+ return (index >= lre->lre_start && index <= lre->lre_end);
+}
+
static int lov_io_sub_init(const struct lu_env *env, struct lov_io *lio,
struct lov_io_sub *sub)
{
!lov_r0(lov, index)->lo_sub[stripe]))
RETURN(-EIO);
+ LASSERTF(is_index_within_mirror(lov, index, lio->lis_mirror_index),
+ DFID "iot = %d, index = %d, mirror = %d\n",
+ PFID(lu_object_fid(lov2lu(lov))), io->ci_type, index,
+ lio->lis_mirror_index);
+
/* obtain new environment */
sub->sub_env = cl_env_get(&sub->sub_refcheck);
if (IS_ERR(sub->sub_env))
sub_io->ci_noatime = io->ci_noatime;
sub_io->ci_pio = io->ci_pio;
sub_io->ci_lock_no_expand = io->ci_lock_no_expand;
+ sub_io->ci_ndelay = io->ci_ndelay;
+ sub_io->ci_layout_version = io->ci_layout_version;
result = cl_io_sub_init(sub->sub_env, sub_io, io->ci_type, sub_obj);
RETURN(0);
}
+/**
+ * Decide if it will need write intent RPC
+ */
+static int lov_io_mirror_write_intent(struct lov_io *lio,
+ struct lov_object *obj, struct cl_io *io)
+{
+ struct lov_layout_composite *comp = &obj->u.composite;
+ struct lu_extent *ext = &io->ci_write_intent;
+ struct lov_mirror_entry *lre;
+ struct lov_mirror_entry *primary;
+ struct lov_layout_entry *lle;
+ size_t count = 0;
+ ENTRY;
+
+ *ext = (typeof(*ext)) { lio->lis_pos, lio->lis_endpos };
+ io->ci_need_write_intent = 0;
+
+ if (!(io->ci_type == CIT_WRITE || cl_io_is_trunc(io) ||
+ cl_io_is_mkwrite(io)))
+ RETURN(0);
+
+ /* FLR: check if it needs to send a write intent RPC to server.
+ * Writing to sync_pending file needs write intent RPC to change
+ * the file state back to write_pending, so that the layout version
+ * can be increased when the state changes to sync_pending at a later
+ * time. Otherwise there exists a chance that an evicted client may
+ * dirty the file data while resync client is working on it.
+ * Designated I/O is allowed for resync workload.
+ */
+ if (lov_flr_state(obj) == LCM_FL_RDONLY ||
+ (lov_flr_state(obj) == LCM_FL_SYNC_PENDING &&
+ io->ci_designated_mirror == 0)) {
+ io->ci_need_write_intent = 1;
+ RETURN(0);
+ }
+
+ LASSERT((lov_flr_state(obj) == LCM_FL_WRITE_PENDING));
+ LASSERT(comp->lo_preferred_mirror >= 0);
+
+ /* need to iterate all components to see if there are
+ * multiple components covering the writing component */
+ primary = &comp->lo_mirrors[comp->lo_preferred_mirror];
+ LASSERT(!primary->lre_stale);
+ lov_foreach_mirror_layout_entry(obj, lle, primary) {
+ LASSERT(lle->lle_valid);
+ if (!lu_extent_is_overlapped(ext, lle->lle_extent))
+ continue;
+
+ ext->e_start = MIN(ext->e_start, lle->lle_extent->e_start);
+ ext->e_end = MAX(ext->e_end, lle->lle_extent->e_end);
+ ++count;
+ }
+ if (count == 0) {
+ CERROR(DFID ": cannot find any valid components covering "
+ "file extent "DEXT", mirror: %d\n",
+ PFID(lu_object_fid(lov2lu(obj))), PEXT(ext),
+ primary->lre_mirror_id);
+ RETURN(-EIO);
+ }
+
+ count = 0;
+ lov_foreach_mirror_entry(obj, lre) {
+ if (lre == primary)
+ continue;
+
+ lov_foreach_mirror_layout_entry(obj, lle, lre) {
+ if (!lle->lle_valid)
+ continue;
+
+ if (lu_extent_is_overlapped(ext, lle->lle_extent)) {
+ ++count;
+ break;
+ }
+ }
+ }
+
+ CDEBUG(D_VFSTRACE, DFID "there are %zd components to be staled to "
+ "modify file extent "DEXT", iot: %d\n",
+ PFID(lu_object_fid(lov2lu(obj))), count, PEXT(ext), io->ci_type);
+
+ io->ci_need_write_intent = count > 0;
+
+ RETURN(0);
+}
+
+static int lov_io_mirror_init(struct lov_io *lio, struct lov_object *obj,
+ struct cl_io *io)
+{
+ struct lov_layout_composite *comp = &obj->u.composite;
+ int index;
+ int i;
+ int result;
+ ENTRY;
+
+ if (!lov_is_flr(obj)) {
+ LASSERT(comp->lo_preferred_mirror == 0);
+ lio->lis_mirror_index = comp->lo_preferred_mirror;
+ io->ci_ndelay = 0;
+ RETURN(0);
+ }
+
+ /* transfer the layout version for verification */
+ if (io->ci_layout_version == 0)
+ io->ci_layout_version = obj->lo_lsm->lsm_layout_gen;
+
+ /* find the corresponding mirror for designated mirror IO */
+ if (io->ci_designated_mirror > 0) {
+ struct lov_mirror_entry *entry;
+
+ LASSERT(!io->ci_ndelay);
+
+ CDEBUG(D_LAYOUT, "designated I/O mirror state: %d\n",
+ lov_flr_state(obj));
+
+ if ((cl_io_is_trunc(io) || io->ci_type == CIT_WRITE) &&
+ (io->ci_layout_version != obj->lo_lsm->lsm_layout_gen)) {
+ /* For resync I/O, the ci_layout_version was the layout
+ * version when resync starts. If it doesn't match the
+ * current object layout version, it means the layout
+ * has been changed */
+ RETURN(-ESTALE);
+ }
+
+ io->ci_layout_version |= LU_LAYOUT_RESYNC;
+
+ index = 0;
+ lio->lis_mirror_index = -1;
+ lov_foreach_mirror_entry(obj, entry) {
+ if (entry->lre_mirror_id ==
+ io->ci_designated_mirror) {
+ lio->lis_mirror_index = index;
+ break;
+ }
+
+ index++;
+ }
+
+ RETURN(lio->lis_mirror_index < 0 ? -EINVAL : 0);
+ }
+
+ result = lov_io_mirror_write_intent(lio, obj, io);
+ if (result)
+ RETURN(result);
+
+ if (io->ci_need_write_intent) {
+ CDEBUG(D_VFSTRACE, DFID " need write intent for [%llu, %llu)\n",
+ PFID(lu_object_fid(lov2lu(obj))),
+ lio->lis_pos, lio->lis_endpos);
+
+ if (cl_io_is_trunc(io)) {
+ /**
+ * 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).
+ */
+ io->ci_write_intent.e_start = 0;
+ io->ci_write_intent.e_end =
+ io->u.ci_setattr.sa_attr.lvb_size;
+ }
+ /* stop cl_io_init() loop */
+ RETURN(1);
+ }
+
+ if (io->ci_ndelay_tried == 0 || /* first time to try */
+ /* reset the mirror index if layout has changed */
+ lio->lis_mirror_layout_gen != obj->lo_lsm->lsm_layout_gen) {
+ lio->lis_mirror_layout_gen = obj->lo_lsm->lsm_layout_gen;
+ index = lio->lis_mirror_index = comp->lo_preferred_mirror;
+ } else {
+ index = lio->lis_mirror_index;
+ LASSERT(index >= 0);
+
+ /* move mirror index to the next one */
+ index = (index + 1) % comp->lo_mirror_count;
+ }
+
+ for (i = 0; i < comp->lo_mirror_count; i++) {
+ struct lu_extent ext = { .e_start = lio->lis_pos,
+ .e_end = lio->lis_pos + 1 };
+ struct lov_mirror_entry *lre;
+ struct lov_layout_entry *lle;
+ bool found = false;
+
+ lre = &comp->lo_mirrors[(index + i) % comp->lo_mirror_count];
+ if (!lre->lre_valid)
+ continue;
+
+ lov_foreach_mirror_layout_entry(obj, lle, lre) {
+ if (!lle->lle_valid)
+ continue;
+
+ if (lu_extent_is_overlapped(&ext, lle->lle_extent)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found) {
+ index = (index + i) % comp->lo_mirror_count;
+ break;
+ }
+ }
+ if (i == comp->lo_mirror_count) {
+ CERROR(DFID": failed to find a component covering "
+ "I/O region at %llu\n",
+ PFID(lu_object_fid(lov2lu(obj))), lio->lis_pos);
+
+ dump_lsm(D_ERROR, obj->lo_lsm);
+
+ RETURN(-EIO);
+ }
+
+ CDEBUG(D_VFSTRACE, DFID ": flr state: %d, move mirror from %d to %d, "
+ "have retried: %d, mirror count: %d\n",
+ PFID(lu_object_fid(lov2lu(obj))), lov_flr_state(obj),
+ lio->lis_mirror_index, index, io->ci_ndelay_tried,
+ comp->lo_mirror_count);
+
+ lio->lis_mirror_index = index;
+
+ /* FLR: if all mirrors have been tried once, most likely the network
+ * of this client has been partitioned. We should relinquish CPU for
+ * a while before trying again. */
+ ++io->ci_ndelay_tried;
+ if (io->ci_ndelay && io->ci_ndelay_tried >= comp->lo_mirror_count) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(msecs_to_jiffies(MSEC_PER_SEC)); /* 10ms */
+ if (signal_pending(current))
+ RETURN(-EINTR);
+
+ /* reset retry counter */
+ io->ci_ndelay_tried = 1;
+ }
+
+ CDEBUG(D_VFSTRACE, "use %sdelayed RPC state for this IO\n",
+ io->ci_ndelay ? "non-" : "");
+
+ RETURN(0);
+}
+
static int lov_io_slice_init(struct lov_io *lio,
struct lov_object *obj, struct cl_io *io)
{
+ int index;
+ int result = 0;
ENTRY;
io->ci_result = 0;
* the current file-tail exactly. */
if (unlikely(obj->lo_lsm->lsm_entries[0]->lsme_pattern &
LOV_PATTERN_F_HOLE))
- RETURN(-EIO);
+ GOTO(out, result = -EIO);
lio->lis_pos = 0;
lio->lis_endpos = OBD_OBJECT_EOF;
break;
}
+ case CIT_GLIMPSE:
+ lio->lis_pos = 0;
+ lio->lis_endpos = OBD_OBJECT_EOF;
+
+ if (lov_flr_state(obj) == LCM_FL_RDONLY &&
+ !OBD_FAIL_CHECK(OBD_FAIL_FLR_GLIMPSE_IMMUTABLE))
+ /* SoM is accurate, no need glimpse */
+ GOTO(out, result = 1);
+ break;
+
case CIT_MISC:
lio->lis_pos = 0;
lio->lis_endpos = OBD_OBJECT_EOF;
LBUG();
}
- RETURN(0);
+ result = lov_io_mirror_init(lio, obj, io);
+ if (result)
+ GOTO(out, result);
+
+ /* check if it needs to instantiate layout */
+ if (!(io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io) ||
+ (cl_io_is_trunc(io) && io->u.ci_setattr.sa_attr.lvb_size > 0)))
+ GOTO(out, result = 0);
+
+ /* for truncate, it only needs to instantiate the components
+ * before the truncated size. */
+ if (cl_io_is_trunc(io)) {
+ io->ci_write_intent.e_start = 0;
+ io->ci_write_intent.e_end = io->u.ci_setattr.sa_attr.lvb_size;
+ } else {
+ io->ci_write_intent.e_start = lio->lis_pos;
+ io->ci_write_intent.e_end = lio->lis_endpos;
+ }
+
+ index = 0;
+ lov_foreach_io_layout(index, lio, &io->ci_write_intent) {
+ if (!lsm_entry_inited(obj->lo_lsm, index)) {
+ io->ci_need_write_intent = 1;
+ break;
+ }
+ }
+
+ if (io->ci_need_write_intent && io->ci_designated_mirror > 0) {
+ /* REINT_SYNC RPC has already tried to instantiate all of the
+ * components involved, obviously it didn't succeed. Skip this
+ * mirror for now. The server won't be able to figure out
+ * which mirror it should instantiate components */
+ CERROR(DFID": trying to instantiate components for designated "
+ "I/O, file state: %d\n",
+ PFID(lu_object_fid(lov2lu(obj))), lov_flr_state(obj));
+
+ io->ci_need_write_intent = 0;
+ GOTO(out, result = -EIO);
+ }
+
+ if (io->ci_need_write_intent)
+ GOTO(out, result = 1);
+
+ EXIT;
+
+out:
+ return result;
}
static void lov_io_fini(const struct lu_env *env, const struct cl_io_slice *ios)
io->u.ci_ladvise.li_flags = parent->u.ci_ladvise.li_flags;
break;
}
+ case CIT_GLIMPSE:
+ case CIT_MISC:
default:
break;
}
static int lov_io_iter_init(const struct lu_env *env,
const struct cl_io_slice *ios)
{
- struct cl_io *io = ios->cis_io;
struct lov_io *lio = cl2lov_io(env, ios);
struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
struct lov_io_sub *sub;
- struct lov_layout_entry *le;
struct lu_extent ext;
int index;
int rc = 0;
ext.e_start = lio->lis_pos;
ext.e_end = lio->lis_endpos;
- index = 0;
- lov_foreach_layout_entry(lio->lis_object, le) {
+ lov_foreach_io_layout(index, lio, &ext) {
+ struct lov_layout_entry *le = lov_entry(lio->lis_object, index);
struct lov_layout_raid0 *r0 = &le->lle_raid0;
u64 start;
u64 end;
int stripe;
- index++;
- if (!lu_extent_is_overlapped(&ext, &le->lle_extent))
- continue;
-
CDEBUG(D_VFSTRACE, "component[%d] flags %#x\n",
- index - 1, lsm->lsm_entries[index - 1]->lsme_flags);
- if (!lsm_entry_inited(lsm, index - 1)) {
- /* truncate IO will trigger write intent as well, and
- * it's handled in lov_io_setattr_iter_init() */
- if (io->ci_type == CIT_WRITE || cl_io_is_mkwrite(io)) {
- io->ci_need_write_intent = 1;
- /* execute it in main thread */
- io->ci_pio = 0;
- rc = -ENODATA;
- break;
- }
-
+ index, lsm->lsm_entries[index]->lsme_flags);
+ if (!lsm_entry_inited(lsm, index)) {
/* Read from uninitialized components should return
* zero filled pages. */
continue;
}
+ if (!le->lle_valid && !ios->cis_io->ci_designated_mirror) {
+ CERROR("I/O to invalid component: %d, mirror: %d\n",
+ index, lio->lis_mirror_index);
+ RETURN(-EIO);
+ }
+
for (stripe = 0; stripe < r0->lo_nr; stripe++) {
- if (!lov_stripe_intersects(lsm, index - 1, stripe,
+ if (!lov_stripe_intersects(lsm, index, stripe,
&ext, &start, &end))
continue;
end = lov_offset_mod(end, 1);
sub = lov_sub_get(env, lio,
- lov_comp_index(index - 1, stripe));
+ lov_comp_index(index, stripe));
if (IS_ERR(sub)) {
rc = PTR_ERR(sub);
break;
{
struct cl_io *io = ios->cis_io;
struct lov_io *lio = cl2lov_io(env, ios);
- struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
struct lov_stripe_md_entry *lse;
struct cl_io_range *range = &io->u.ci_rw.rw_range;
loff_t start = range->cir_pos;
if (cl_io_is_append(io))
RETURN(lov_io_iter_init(env, ios));
- index = lov_lsm_entry(lsm, range->cir_pos);
+ index = lov_io_layout_at(lio, range->cir_pos);
if (index < 0) { /* non-existing layout component */
if (io->ci_type == CIT_READ) {
/* TODO: it needs to detect the next component and
RETURN(-ENODATA);
}
+ if (!lov_entry(lio->lis_object, index)->lle_valid &&
+ !io->ci_designated_mirror)
+ RETURN(io->ci_type == CIT_READ ? -EAGAIN : -EIO);
+
lse = lov_lse(lio->lis_object, index);
next = MAX_LFS_FILESIZE;
io->ci_pio = 0;
}
- if (io->ci_pio) {
- /* it only splits IO here for parallel IO,
- * there will be no actual IO going to occur,
- * so it doesn't need to invoke lov_io_iter_init()
- * to initialize sub IOs. */
- if (!lsm_entry_inited(lsm, index)) {
- io->ci_need_write_intent = 1;
- RETURN(-ENODATA);
- }
+ if (io->ci_pio)
RETURN(0);
- }
/*
* XXX The following call should be optimized: we know, that
{
struct lov_io *lio = cl2lov_io(env, ios);
struct cl_io *io = ios->cis_io;
- struct lov_stripe_md *lsm = lio->lis_object->lo_lsm;
int index;
ENTRY;
if (cl_io_is_trunc(io) && lio->lis_pos > 0) {
- index = lov_lsm_entry(lsm, lio->lis_pos - 1);
+ index = lov_io_layout_at(lio, lio->lis_pos - 1);
/* no entry found for such offset */
- if (index < 0) {
+ if (index < 0)
RETURN(io->ci_result = -ENODATA);
- } else if (!lsm_entry_inited(lsm, index)) {
- io->ci_need_write_intent = 1;
- RETURN(io->ci_result = -ENODATA);
- }
}
RETURN(lov_io_iter_init(env, ios));
{
struct lov_io *lio = cl2lov_io(env, ios);
struct cl_io *parent = lio->lis_cl.cis_io;
+ struct cl_data_version_io *pdv = &parent->u.ci_data_version;
struct lov_io_sub *sub;
ENTRY;
list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
- lov_io_end_wrapper(env, &sub->sub_io);
+ struct cl_data_version_io *sdv = &sub->sub_io.u.ci_data_version;
+
+ lov_io_end_wrapper(sub->sub_env, &sub->sub_io);
- parent->u.ci_data_version.dv_data_version +=
- sub->sub_io.u.ci_data_version.dv_data_version;
+ pdv->dv_data_version += sdv->dv_data_version;
+ if (pdv->dv_layout_version > sdv->dv_layout_version)
+ pdv->dv_layout_version = sdv->dv_layout_version;
if (parent->ci_result == 0)
parent->ci_result = sub->sub_io.ci_result;
ENTRY;
offset = cl_offset(obj, start);
- index = lov_lsm_entry(loo->lo_lsm, offset);
+ index = lov_io_layout_at(lio, offset);
if (index < 0 || !lsm_entry_inited(loo->lo_lsm, index))
RETURN(-ENODATA);
+ /* avoid readahead to expand to stale components */
+ if (!lov_entry(loo, index)->lle_valid)
+ RETURN(-EIO);
+
stripe = lov_stripe_number(loo->lo_lsm, index, offset);
r0 = lov_r0(loo, index);
ra_end, stripe);
/* boundary of current component */
- ra_end = cl_index(obj, (loff_t)lov_lse(loo, index)->lsme_extent.e_end);
+ ra_end = cl_index(obj, (loff_t)lov_io_extent(lio, index)->e_end);
if (ra_end != CL_PAGE_EOF && ra->cra_end >= ra_end)
ra->cra_end = ra_end - 1;
int rc = 0;
ENTRY;
- if (lio->lis_nr_subios == 1) {
- int idx = lio->lis_single_subio_index;
-
- sub = lov_sub_get(env, lio, idx);
- LASSERT(!IS_ERR(sub));
- LASSERT(sub == &lio->lis_single_subio);
- rc = cl_io_submit_rw(sub->sub_env, &sub->sub_io,
- crt, queue);
- RETURN(rc);
- }
-
cl_page_list_init(plist);
while (qin->pl_nr > 0) {
struct cl_2queue *cl2q = &lov_env_info(env)->lti_cl2q;
- cl_2queue_init(cl2q);
-
page = cl_page_list_first(qin);
+ if (lov_page_is_empty(page)) {
+ cl_page_list_move(&queue->c2_qout, qin, page);
+
+ /* it could only be mirror read to get here therefore
+ * the pages will be transient. We don't care about
+ * the return code of cl_page_prep() at all. */
+ (void) cl_page_prep(env, ios->cis_io, page, crt);
+ cl_page_completion(env, page, crt, 0);
+ continue;
+ }
+
+ cl_2queue_init(cl2q);
cl_page_list_move(&cl2q->c2_qin, qin, page);
index = lov_page_index(page);
if (lio->lis_nr_subios == 1) {
int idx = lio->lis_single_subio_index;
+ LASSERT(!lov_page_is_empty(cl_page_list_first(queue)));
+
sub = lov_sub_get(env, lio, idx);
LASSERT(!IS_ERR(sub));
LASSERT(sub == &lio->lis_single_subio);
LASSERT(plist->pl_nr == 0);
page = cl_page_list_first(queue);
+ LASSERT(!lov_page_is_empty(page));
+
cl_page_list_move(plist, queue, page);
index = lov_page_index(page);
.cio_start = lov_io_start,
.cio_end = lov_io_end
},
+ [CIT_GLIMPSE] = {
+ .cio_fini = lov_io_fini,
+ },
[CIT_MISC] = {
.cio_fini = lov_io_fini
}
[CIT_LADVISE] = {
.cio_fini = lov_empty_io_fini
},
+ [CIT_GLIMPSE] = {
+ .cio_fini = lov_empty_io_fini
+ },
[CIT_MISC] = {
.cio_fini = lov_empty_io_fini
}
{
struct lov_io *lio = lov_env_io(env);
struct lov_object *lov = cl2lov(obj);
-
+ int result;
ENTRY;
+
INIT_LIST_HEAD(&lio->lis_active);
- io->ci_result = lov_io_slice_init(lio, lov, io);
- if (io->ci_result != 0)
- RETURN(io->ci_result);
-
- if (io->ci_result == 0) {
- io->ci_result = lov_io_subio_init(env, lio, io);
- if (io->ci_result == 0) {
- cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
- atomic_inc(&lov->lo_active_ios);
- }
+ result = lov_io_slice_init(lio, lov, io);
+ if (result)
+ GOTO(out, result);
+
+ result = lov_io_subio_init(env, lio, io);
+ if (!result) {
+ cl_io_slice_add(io, &lio->lis_cl, obj, &lov_io_ops);
+ atomic_inc(&lov->lo_active_ios);
}
- RETURN(io->ci_result);
+ EXIT;
+out:
+ io->ci_result = result < 0 ? result : 0;
+ return result;
}
int lov_io_init_empty(const struct lu_env *env, struct cl_object *obj,
default:
LBUG();
case CIT_MISC:
+ case CIT_GLIMPSE:
case CIT_READ:
result = 0;
break;
LASSERTF(0, "invalid type %d\n", io->ci_type);
result = -EOPNOTSUPP;
break;
+ case CIT_GLIMPSE:
case CIT_MISC:
case CIT_FSYNC:
case CIT_LADVISE:
io->ci_result = result < 0 ? result : 0;
RETURN(result);
}
+
+/**
+ * Return the index in composite:lo_entries by the file offset
+ */
+int lov_io_layout_at(struct lov_io *lio, __u64 offset)
+{
+ struct lov_object *lov = lio->lis_object;
+ struct lov_layout_composite *comp = &lov->u.composite;
+ int start_index = 0;
+ int end_index = comp->lo_entry_count - 1;
+ int i;
+
+ LASSERT(lov->lo_type == LLT_COMP);
+
+ /* This is actual file offset so nothing can cover eof. */
+ if (offset == LUSTRE_EOF)
+ return -1;
+
+ if (lov_is_flr(lov)) {
+ struct lov_mirror_entry *lre;
+
+ LASSERT(lio->lis_mirror_index >= 0);
+
+ lre = &comp->lo_mirrors[lio->lis_mirror_index];
+ start_index = lre->lre_start;
+ end_index = lre->lre_end;
+ }
+
+ for (i = start_index; i <= end_index; i++) {
+ struct lov_layout_entry *lle = lov_entry(lov, i);
+
+ if ((offset >= lle->lle_extent->e_start &&
+ offset < lle->lle_extent->e_end) ||
+ (offset == OBD_OBJECT_EOF &&
+ lle->lle_extent->e_end == OBD_OBJECT_EOF))
+ return i;
+ }
+
+ return -1;
+}
+
/** @} lov */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff