if (!realm)
return ERR_PTR(-ENOMEM);
- atomic_set(&realm->nref, 1); /* for caller */
+ /* Do not release the global dummy snaprealm until unmouting */
+ if (ino == CEPH_INO_GLOBAL_SNAPREALM)
+ atomic_set(&realm->nref, 2);
+ else
+ atomic_set(&realm->nref, 1);
realm->ino = ino;
INIT_LIST_HEAD(&realm->children);
INIT_LIST_HEAD(&realm->child_item);
INIT_LIST_HEAD(&realm->empty_item);
INIT_LIST_HEAD(&realm->dirty_item);
+ INIT_LIST_HEAD(&realm->rebuild_item);
INIT_LIST_HEAD(&realm->inodes_with_caps);
spin_lock_init(&realm->inodes_with_caps_lock);
__insert_snap_realm(&mdsc->snap_realms, realm);
mdsc->num_snap_realms++;
- dout("create_snap_realm %llx %p\n", realm->ino, realm);
+ dout("%s %llx %p\n", __func__, realm->ino, realm);
return realm;
}
else if (ino > r->ino)
n = n->rb_right;
else {
- dout("lookup_snap_realm %llx %p\n", r->ino, r);
+ dout("%s %llx %p\n", __func__, r->ino, r);
return r;
}
}
{
lockdep_assert_held_write(&mdsc->snap_rwsem);
- dout("__destroy_snap_realm %p %llx\n", realm, realm->ino);
+ dout("%s %p %llx\n", __func__, realm, realm->ino);
rb_erase(&realm->node, &mdsc->snap_realms);
mdsc->num_snap_realms--;
spin_unlock(&mdsc->snap_empty_lock);
}
-void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc)
+void ceph_cleanup_global_and_empty_realms(struct ceph_mds_client *mdsc)
{
+ struct ceph_snap_realm *global_realm;
+
down_write(&mdsc->snap_rwsem);
+ global_realm = __lookup_snap_realm(mdsc, CEPH_INO_GLOBAL_SNAPREALM);
+ if (global_realm)
+ ceph_put_snap_realm(mdsc, global_realm);
__cleanup_empty_realms(mdsc);
up_write(&mdsc->snap_rwsem);
}
if (IS_ERR(parent))
return PTR_ERR(parent);
}
- dout("adjust_snap_realm_parent %llx %p: %llx %p -> %llx %p\n",
- realm->ino, realm, realm->parent_ino, realm->parent,
- parentino, parent);
+ dout("%s %llx %p: %llx %p -> %llx %p\n", __func__, realm->ino,
+ realm, realm->parent_ino, realm->parent, parentino, parent);
if (realm->parent) {
list_del_init(&realm->child_item);
ceph_put_snap_realm(mdsc, realm->parent);
* build the snap context for a given realm.
*/
static int build_snap_context(struct ceph_snap_realm *realm,
- struct list_head* dirty_realms)
+ struct list_head *realm_queue,
+ struct list_head *dirty_realms)
{
struct ceph_snap_realm *parent = realm->parent;
struct ceph_snap_context *snapc;
*/
if (parent) {
if (!parent->cached_context) {
- err = build_snap_context(parent, dirty_realms);
- if (err)
- goto fail;
+ /* add to the queue head */
+ list_add(&parent->rebuild_item, realm_queue);
+ return 1;
}
num += parent->cached_context->num_snaps;
}
realm->cached_context->seq == realm->seq &&
(!parent ||
realm->cached_context->seq >= parent->cached_context->seq)) {
- dout("build_snap_context %llx %p: %p seq %lld (%u snaps)"
- " (unchanged)\n",
- realm->ino, realm, realm->cached_context,
+ dout("%s %llx %p: %p seq %lld (%u snaps) (unchanged)\n",
+ __func__, realm->ino, realm, realm->cached_context,
realm->cached_context->seq,
(unsigned int)realm->cached_context->num_snaps);
return 0;
sort(snapc->snaps, num, sizeof(u64), cmpu64_rev, NULL);
snapc->num_snaps = num;
- dout("build_snap_context %llx %p: %p seq %lld (%u snaps)\n",
- realm->ino, realm, snapc, snapc->seq,
- (unsigned int) snapc->num_snaps);
+ dout("%s %llx %p: %p seq %lld (%u snaps)\n", __func__, realm->ino,
+ realm, snapc, snapc->seq, (unsigned int) snapc->num_snaps);
ceph_put_snap_context(realm->cached_context);
realm->cached_context = snapc;
ceph_put_snap_context(realm->cached_context);
realm->cached_context = NULL;
}
- pr_err("build_snap_context %llx %p fail %d\n", realm->ino,
- realm, err);
+ pr_err("%s %llx %p fail %d\n", __func__, realm->ino, realm, err);
return err;
}
static void rebuild_snap_realms(struct ceph_snap_realm *realm,
struct list_head *dirty_realms)
{
- struct ceph_snap_realm *child;
+ LIST_HEAD(realm_queue);
+ int last = 0;
+ bool skip = false;
+
+ list_add_tail(&realm->rebuild_item, &realm_queue);
+
+ while (!list_empty(&realm_queue)) {
+ struct ceph_snap_realm *_realm, *child;
+
+ _realm = list_first_entry(&realm_queue,
+ struct ceph_snap_realm,
+ rebuild_item);
+
+ /*
+ * If the last building failed dues to memory
+ * issue, just empty the realm_queue and return
+ * to avoid infinite loop.
+ */
+ if (last < 0) {
+ list_del_init(&_realm->rebuild_item);
+ continue;
+ }
- dout("rebuild_snap_realms %llx %p\n", realm->ino, realm);
- build_snap_context(realm, dirty_realms);
+ last = build_snap_context(_realm, &realm_queue, dirty_realms);
+ dout("%s %llx %p, %s\n", __func__, _realm->ino, _realm,
+ last > 0 ? "is deferred" : !last ? "succeeded" : "failed");
- list_for_each_entry(child, &realm->children, child_item)
- rebuild_snap_realms(child, dirty_realms);
+ /* is any child in the list ? */
+ list_for_each_entry(child, &_realm->children, child_item) {
+ if (!list_empty(&child->rebuild_item)) {
+ skip = true;
+ break;
+ }
+ }
+
+ if (!skip) {
+ list_for_each_entry(child, &_realm->children, child_item)
+ list_add_tail(&child->rebuild_item, &realm_queue);
+ }
+
+ /* last == 1 means need to build parent first */
+ if (last <= 0)
+ list_del_init(&_realm->rebuild_item);
+ }
}
* Caller must hold snap_rwsem for read (i.e., the realm topology won't
* change).
*/
-static void ceph_queue_cap_snap(struct ceph_inode_info *ci)
+static void ceph_queue_cap_snap(struct ceph_inode_info *ci,
+ struct ceph_cap_snap **pcapsnap)
{
struct inode *inode = &ci->vfs_inode;
- struct ceph_cap_snap *capsnap;
struct ceph_snap_context *old_snapc, *new_snapc;
+ struct ceph_cap_snap *capsnap = *pcapsnap;
struct ceph_buffer *old_blob = NULL;
int used, dirty;
- capsnap = kmem_cache_zalloc(ceph_cap_snap_cachep, GFP_NOFS);
- if (!capsnap) {
- pr_err("ENOMEM allocating ceph_cap_snap on %p\n", inode);
- return;
- }
- capsnap->cap_flush.is_capsnap = true;
- INIT_LIST_HEAD(&capsnap->cap_flush.i_list);
- INIT_LIST_HEAD(&capsnap->cap_flush.g_list);
-
spin_lock(&ci->i_ceph_lock);
used = __ceph_caps_used(ci);
dirty = __ceph_caps_dirty(ci);
as no new writes are allowed to start when pending, so any
writes in progress now were started before the previous
cap_snap. lucky us. */
- dout("queue_cap_snap %p already pending\n", inode);
+ dout("%s %p %llx.%llx already pending\n",
+ __func__, inode, ceph_vinop(inode));
goto update_snapc;
}
if (ci->i_wrbuffer_ref_head == 0 &&
!(dirty & (CEPH_CAP_ANY_EXCL|CEPH_CAP_FILE_WR))) {
- dout("queue_cap_snap %p nothing dirty|writing\n", inode);
+ dout("%s %p %llx.%llx nothing dirty|writing\n",
+ __func__, inode, ceph_vinop(inode));
goto update_snapc;
}
} else {
if (!(used & CEPH_CAP_FILE_WR) &&
ci->i_wrbuffer_ref_head == 0) {
- dout("queue_cap_snap %p "
- "no new_snap|dirty_page|writing\n", inode);
+ dout("%s %p %llx.%llx no new_snap|dirty_page|writing\n",
+ __func__, inode, ceph_vinop(inode));
goto update_snapc;
}
}
- dout("queue_cap_snap %p cap_snap %p queuing under %p %s %s\n",
- inode, capsnap, old_snapc, ceph_cap_string(dirty),
- capsnap->need_flush ? "" : "no_flush");
+ dout("%s %p %llx.%llx cap_snap %p queuing under %p %s %s\n",
+ __func__, inode, ceph_vinop(inode), capsnap, old_snapc,
+ ceph_cap_string(dirty), capsnap->need_flush ? "" : "no_flush");
ihold(inode);
- refcount_set(&capsnap->nref, 1);
- INIT_LIST_HEAD(&capsnap->ci_item);
-
capsnap->follows = old_snapc->seq;
capsnap->issued = __ceph_caps_issued(ci, NULL);
capsnap->dirty = dirty;
list_add_tail(&capsnap->ci_item, &ci->i_cap_snaps);
if (used & CEPH_CAP_FILE_WR) {
- dout("queue_cap_snap %p cap_snap %p snapc %p"
- " seq %llu used WR, now pending\n", inode,
+ dout("%s %p %llx.%llx cap_snap %p snapc %p seq %llu used WR,"
+ " now pending\n", __func__, inode, ceph_vinop(inode),
capsnap, old_snapc, old_snapc->seq);
capsnap->writing = 1;
} else {
/* note mtime, size NOW. */
__ceph_finish_cap_snap(ci, capsnap);
}
- capsnap = NULL;
+ *pcapsnap = NULL;
old_snapc = NULL;
update_snapc:
- if (ci->i_wrbuffer_ref_head == 0 &&
- ci->i_wr_ref == 0 &&
- ci->i_dirty_caps == 0 &&
- ci->i_flushing_caps == 0) {
- ci->i_head_snapc = NULL;
- } else {
+ if (ci->i_wrbuffer_ref_head == 0 &&
+ ci->i_wr_ref == 0 &&
+ ci->i_dirty_caps == 0 &&
+ ci->i_flushing_caps == 0) {
+ ci->i_head_snapc = NULL;
+ } else {
ci->i_head_snapc = ceph_get_snap_context(new_snapc);
dout(" new snapc is %p\n", new_snapc);
}
spin_unlock(&ci->i_ceph_lock);
ceph_buffer_put(old_blob);
- if (capsnap)
- kmem_cache_free(ceph_cap_snap_cachep, capsnap);
ceph_put_snap_context(old_snapc);
}
capsnap->truncate_size = ci->i_truncate_size;
capsnap->truncate_seq = ci->i_truncate_seq;
if (capsnap->dirty_pages) {
- dout("finish_cap_snap %p cap_snap %p snapc %p %llu %s s=%llu "
- "still has %d dirty pages\n", inode, capsnap,
- capsnap->context, capsnap->context->seq,
- ceph_cap_string(capsnap->dirty), capsnap->size,
- capsnap->dirty_pages);
+ dout("%s %p %llx.%llx cap_snap %p snapc %p %llu %s s=%llu "
+ "still has %d dirty pages\n", __func__, inode,
+ ceph_vinop(inode), capsnap, capsnap->context,
+ capsnap->context->seq, ceph_cap_string(capsnap->dirty),
+ capsnap->size, capsnap->dirty_pages);
return 0;
}
/* Fb cap still in use, delay it */
if (ci->i_wb_ref) {
- dout("finish_cap_snap %p cap_snap %p snapc %p %llu %s s=%llu "
- "used WRBUFFER, delaying\n", inode, capsnap,
- capsnap->context, capsnap->context->seq,
- ceph_cap_string(capsnap->dirty), capsnap->size);
+ dout("%s %p %llx.%llx cap_snap %p snapc %p %llu %s s=%llu "
+ "used WRBUFFER, delaying\n", __func__, inode,
+ ceph_vinop(inode), capsnap, capsnap->context,
+ capsnap->context->seq, ceph_cap_string(capsnap->dirty),
+ capsnap->size);
capsnap->writing = 1;
return 0;
}
ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
- dout("finish_cap_snap %p cap_snap %p snapc %p %llu %s s=%llu\n",
- inode, capsnap, capsnap->context,
+ dout("%s %p %llx.%llx cap_snap %p snapc %p %llu %s s=%llu\n",
+ __func__, inode, ceph_vinop(inode), capsnap, capsnap->context,
capsnap->context->seq, ceph_cap_string(capsnap->dirty),
capsnap->size);
{
struct ceph_inode_info *ci;
struct inode *lastinode = NULL;
+ struct ceph_cap_snap *capsnap = NULL;
- dout("queue_realm_cap_snaps %p %llx inodes\n", realm, realm->ino);
+ dout("%s %p %llx inode\n", __func__, realm, realm->ino);
spin_lock(&realm->inodes_with_caps_lock);
list_for_each_entry(ci, &realm->inodes_with_caps, i_snap_realm_item) {
spin_unlock(&realm->inodes_with_caps_lock);
iput(lastinode);
lastinode = inode;
- ceph_queue_cap_snap(ci);
+
+ /*
+ * Allocate the capsnap memory outside of ceph_queue_cap_snap()
+ * to reduce very possible but unnecessary frequently memory
+ * allocate/free in this loop.
+ */
+ if (!capsnap) {
+ capsnap = kmem_cache_zalloc(ceph_cap_snap_cachep, GFP_NOFS);
+ if (!capsnap) {
+ pr_err("ENOMEM allocating ceph_cap_snap on %p\n",
+ inode);
+ return;
+ }
+ }
+ capsnap->cap_flush.is_capsnap = true;
+ refcount_set(&capsnap->nref, 1);
+ INIT_LIST_HEAD(&capsnap->cap_flush.i_list);
+ INIT_LIST_HEAD(&capsnap->cap_flush.g_list);
+ INIT_LIST_HEAD(&capsnap->ci_item);
+
+ ceph_queue_cap_snap(ci, &capsnap);
spin_lock(&realm->inodes_with_caps_lock);
}
spin_unlock(&realm->inodes_with_caps_lock);
iput(lastinode);
- dout("queue_realm_cap_snaps %p %llx done\n", realm, realm->ino);
+ if (capsnap)
+ kmem_cache_free(ceph_cap_snap_cachep, capsnap);
+ dout("%s %p %llx done\n", __func__, realm, realm->ino);
}
/*
__le64 *prior_parent_snaps; /* encoded */
struct ceph_snap_realm *realm = NULL;
struct ceph_snap_realm *first_realm = NULL;
- int invalidate = 0;
+ struct ceph_snap_realm *realm_to_rebuild = NULL;
+ int rebuild_snapcs;
int err = -ENOMEM;
LIST_HEAD(dirty_realms);
lockdep_assert_held_write(&mdsc->snap_rwsem);
- dout("update_snap_trace deletion=%d\n", deletion);
+ dout("%s deletion=%d\n", __func__, deletion);
more:
+ rebuild_snapcs = 0;
ceph_decode_need(&p, e, sizeof(*ri), bad);
ri = p;
p += sizeof(*ri);
err = adjust_snap_realm_parent(mdsc, realm, le64_to_cpu(ri->parent));
if (err < 0)
goto fail;
- invalidate += err;
+ rebuild_snapcs += err;
if (le64_to_cpu(ri->seq) > realm->seq) {
- dout("update_snap_trace updating %llx %p %lld -> %lld\n",
+ dout("%s updating %llx %p %lld -> %lld\n", __func__,
realm->ino, realm, realm->seq, le64_to_cpu(ri->seq));
/* update realm parameters, snap lists */
realm->seq = le64_to_cpu(ri->seq);
if (realm->seq > mdsc->last_snap_seq)
mdsc->last_snap_seq = realm->seq;
- invalidate = 1;
+ rebuild_snapcs = 1;
} else if (!realm->cached_context) {
- dout("update_snap_trace %llx %p seq %lld new\n",
+ dout("%s %llx %p seq %lld new\n", __func__,
realm->ino, realm, realm->seq);
- invalidate = 1;
+ rebuild_snapcs = 1;
} else {
- dout("update_snap_trace %llx %p seq %lld unchanged\n",
+ dout("%s %llx %p seq %lld unchanged\n", __func__,
realm->ino, realm, realm->seq);
}
- dout("done with %llx %p, invalidated=%d, %p %p\n", realm->ino,
- realm, invalidate, p, e);
+ dout("done with %llx %p, rebuild_snapcs=%d, %p %p\n", realm->ino,
+ realm, rebuild_snapcs, p, e);
+
+ /*
+ * this will always track the uppest parent realm from which
+ * we need to rebuild the snapshot contexts _downward_ in
+ * hierarchy.
+ */
+ if (rebuild_snapcs)
+ realm_to_rebuild = realm;
- /* invalidate when we reach the _end_ (root) of the trace */
- if (invalidate && p >= e)
- rebuild_snap_realms(realm, &dirty_realms);
+ /* rebuild_snapcs when we reach the _end_ (root) of the trace */
+ if (realm_to_rebuild && p >= e)
+ rebuild_snap_realms(realm_to_rebuild, &dirty_realms);
if (!first_realm)
first_realm = realm;
ceph_put_snap_realm(mdsc, realm);
if (first_realm)
ceph_put_snap_realm(mdsc, first_realm);
- pr_err("update_snap_trace error %d\n", err);
+ pr_err("%s error %d\n", __func__, err);
return err;
}
struct inode *inode;
struct ceph_mds_session *session = NULL;
- dout("flush_snaps\n");
+ dout("%s\n", __func__);
spin_lock(&mdsc->snap_flush_lock);
while (!list_empty(&mdsc->snap_flush_list)) {
ci = list_first_entry(&mdsc->snap_flush_list,
spin_unlock(&mdsc->snap_flush_lock);
ceph_put_mds_session(session);
- dout("flush_snaps done\n");
+ dout("%s done\n", __func__);
}
/**
trace_len = le32_to_cpu(h->trace_len);
p += sizeof(*h);
- dout("handle_snap from mds%d op %s split %llx tracelen %d\n", mds,
- ceph_snap_op_name(op), split, trace_len);
+ dout("%s from mds%d op %s split %llx tracelen %d\n", __func__,
+ mds, ceph_snap_op_name(op), split, trace_len);
mutex_lock(&session->s_mutex);
inc_session_sequence(session);
*/
if (ci->i_snap_realm->created >
le64_to_cpu(ri->created)) {
- dout(" leaving %p in newer realm %llx %p\n",
- inode, ci->i_snap_realm->ino,
+ dout(" leaving %p %llx.%llx in newer realm %llx %p\n",
+ inode, ceph_vinop(inode), ci->i_snap_realm->ino,
ci->i_snap_realm);
goto skip_inode;
}
- dout(" will move %p to split realm %llx %p\n",
- inode, realm->ino, realm);
+ dout(" will move %p %llx.%llx to split realm %llx %p\n",
+ inode, ceph_vinop(inode), realm->ino, realm);
ceph_get_snap_realm(mdsc, realm);
ceph_change_snap_realm(inode, realm);
return;
bad:
- pr_err("corrupt snap message from mds%d\n", mds);
+ pr_err("%s corrupt snap message from mds%d\n", __func__, mds);
ceph_msg_dump(msg);
out:
if (locked_rwsem)
}
spin_unlock(&mdsc->snapid_map_lock);
if (exist) {
- dout("found snapid map %llx -> %x\n", exist->snap, exist->dev);
+ dout("%s found snapid map %llx -> %x\n", __func__,
+ exist->snap, exist->dev);
return exist;
}
if (exist) {
free_anon_bdev(sm->dev);
kfree(sm);
- dout("found snapid map %llx -> %x\n", exist->snap, exist->dev);
+ dout("%s found snapid map %llx -> %x\n", __func__,
+ exist->snap, exist->dev);
return exist;
}
- dout("create snapid map %llx -> %x\n", sm->snap, sm->dev);
+ dout("%s create snapid map %llx -> %x\n", __func__,
+ sm->snap, sm->dev);
return sm;
}
projects / platform / kernel / linux-starfive.git / blobdiff