--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+
+#include "common/perf_counters.h"
+
+#include "mds/MDSRank.h"
+#include "mds/MDCache.h"
+#include "mds/MDLog.h"
+#include "mds/CDir.h"
+#include "mds/CDentry.h"
+#include "events/EUpdate.h"
+#include "messages/MClientRequest.h"
+
+#include "StrayManager.h"
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mds
+#undef dout_prefix
+#define dout_prefix _prefix(_dout, mds)
+static ostream& _prefix(std::ostream *_dout, MDSRank *mds) {
+ return *_dout << "mds." << mds->get_nodeid() << ".cache.strays ";
+}
+
+class StrayManagerIOContext : public virtual MDSIOContextBase {
+protected:
+ StrayManager *sm;
+ MDSRank *get_mds() override
+ {
+ return sm->mds;
+ }
+public:
+ explicit StrayManagerIOContext(StrayManager *sm_) : sm(sm_) {}
+};
+
+class StrayManagerLogContext : public virtual MDSLogContextBase {
+protected:
+ StrayManager *sm;
+ MDSRank *get_mds() override
+ {
+ return sm->mds;
+ }
+public:
+ explicit StrayManagerLogContext(StrayManager *sm_) : sm(sm_) {}
+};
+
+class StrayManagerContext : public virtual MDSInternalContextBase {
+protected:
+ StrayManager *sm;
+ MDSRank *get_mds() override
+ {
+ return sm->mds;
+ }
+public:
+ explicit StrayManagerContext(StrayManager *sm_) : sm(sm_) {}
+};
+
+
+/**
+ * Context wrapper for _purge_stray_purged completion
+ */
+class C_IO_PurgeStrayPurged : public StrayManagerIOContext {
+ CDentry *dn;
+ bool only_head;
+public:
+ C_IO_PurgeStrayPurged(StrayManager *sm_, CDentry *d, bool oh) :
+ StrayManagerIOContext(sm_), dn(d), only_head(oh) { }
+ void finish(int r) override {
+ assert(r == 0 || r == -ENOENT);
+ sm->_purge_stray_purged(dn, only_head);
+ }
+};
+
+
+void StrayManager::purge(CDentry *dn)
+{
+ CDentry::linkage_t *dnl = dn->get_projected_linkage();
+ CInode *in = dnl->get_inode();
+ dout(10) << __func__ << " " << *dn << " " << *in << dendl;
+ assert(!dn->is_replicated());
+
+ // CHEAT. there's no real need to journal our intent to purge, since
+ // that is implicit in the dentry's presence and non-use in the stray
+ // dir. on recovery, we'll need to re-eval all strays anyway.
+
+ SnapContext nullsnapc;
+
+ PurgeItem item;
+ item.ino = in->inode.ino;
+ if (in->is_dir()) {
+ item.action = PurgeItem::PURGE_DIR;
+ item.fragtree = in->dirfragtree;
+ } else {
+ item.action = PurgeItem::PURGE_FILE;
+
+ const SnapContext *snapc;
+ SnapRealm *realm = in->find_snaprealm();
+ if (realm) {
+ dout(10) << " realm " << *realm << dendl;
+ snapc = &realm->get_snap_context();
+ } else {
+ dout(10) << " NO realm, using null context" << dendl;
+ snapc = &nullsnapc;
+ assert(in->last == CEPH_NOSNAP);
+ }
+
+ uint64_t to = 0;
+ if (in->is_file()) {
+ to = in->inode.get_max_size();
+ to = MAX(in->inode.size, to);
+ // when truncating a file, the filer does not delete stripe objects that are
+ // truncated to zero. so we need to purge stripe objects up to the max size
+ // the file has ever been.
+ to = MAX(in->inode.max_size_ever, to);
+ }
+
+ inode_t *pi = in->get_projected_inode();
+
+ item.size = to;
+ item.layout = pi->layout;
+ item.old_pools = pi->old_pools;
+ item.snapc = *snapc;
+ }
+
+ purge_queue.push(item, new C_IO_PurgeStrayPurged(
+ this, dn, false));
+}
+
+class C_PurgeStrayLogged : public StrayManagerLogContext {
+ CDentry *dn;
+ version_t pdv;
+ LogSegment *ls;
+public:
+ C_PurgeStrayLogged(StrayManager *sm_, CDentry *d, version_t v, LogSegment *s) :
+ StrayManagerLogContext(sm_), dn(d), pdv(v), ls(s) { }
+ void finish(int r) override {
+ sm->_purge_stray_logged(dn, pdv, ls);
+ }
+};
+
+class C_TruncateStrayLogged : public StrayManagerLogContext {
+ CDentry *dn;
+ LogSegment *ls;
+public:
+ C_TruncateStrayLogged(StrayManager *sm, CDentry *d, LogSegment *s) :
+ StrayManagerLogContext(sm), dn(d), ls(s) { }
+ void finish(int r) override {
+ sm->_truncate_stray_logged(dn, ls);
+ }
+};
+
+void StrayManager::_purge_stray_purged(
+ CDentry *dn, bool only_head)
+{
+ CInode *in = dn->get_projected_linkage()->get_inode();
+ dout(10) << "_purge_stray_purged " << *dn << " " << *in << dendl;
+
+ logger->inc(l_mdc_strays_enqueued);
+ num_strays_enqueuing--;
+ logger->set(l_mdc_num_strays_enqueuing, num_strays_enqueuing);
+
+ if (only_head) {
+ /* This was a ::truncate */
+ EUpdate *le = new EUpdate(mds->mdlog, "purge_stray truncate");
+ mds->mdlog->start_entry(le);
+
+ inode_t *pi = in->project_inode();
+ pi->size = 0;
+ pi->max_size_ever = 0;
+ pi->client_ranges.clear();
+ pi->truncate_size = 0;
+ pi->truncate_from = 0;
+ pi->version = in->pre_dirty();
+
+ le->metablob.add_dir_context(dn->dir);
+ le->metablob.add_primary_dentry(dn, in, true);
+
+ mds->mdlog->submit_entry(le,
+ new C_TruncateStrayLogged(
+ this, dn, mds->mdlog->get_current_segment()));
+ } else {
+ if (in->get_num_ref() != (int)in->is_dirty() ||
+ dn->get_num_ref() != (int)dn->is_dirty() + !!in->get_num_ref() + 1/*PIN_PURGING*/) {
+ // Nobody should be taking new references to an inode when it
+ // is being purged (aside from it were
+
+ derr << "Rogue reference after purge to " << *dn << dendl;
+ assert(0 == "rogue reference to purging inode");
+ }
+
+ // kill dentry.
+ version_t pdv = dn->pre_dirty();
+ dn->push_projected_linkage(); // NULL
+
+ EUpdate *le = new EUpdate(mds->mdlog, "purge_stray");
+ mds->mdlog->start_entry(le);
+
+ // update dirfrag fragstat, rstat
+ CDir *dir = dn->get_dir();
+ fnode_t *pf = dir->project_fnode();
+ pf->version = dir->pre_dirty();
+ if (in->is_dir())
+ pf->fragstat.nsubdirs--;
+ else
+ pf->fragstat.nfiles--;
+ pf->rstat.sub(in->inode.accounted_rstat);
+
+ le->metablob.add_dir_context(dn->dir);
+ EMetaBlob::dirlump& dl = le->metablob.add_dir(dn->dir, true);
+ le->metablob.add_null_dentry(dl, dn, true);
+ le->metablob.add_destroyed_inode(in->ino());
+
+ mds->mdlog->submit_entry(le, new C_PurgeStrayLogged(this, dn, pdv,
+ mds->mdlog->get_current_segment()));
+
+ logger->set(l_mdc_num_strays, num_strays);
+ }
+}
+
+void StrayManager::_purge_stray_logged(CDentry *dn, version_t pdv, LogSegment *ls)
+{
+ CInode *in = dn->get_linkage()->get_inode();
+ dout(10) << "_purge_stray_logged " << *dn << " " << *in << dendl;
+
+ assert(!in->state_test(CInode::STATE_RECOVERING));
+
+ bool new_dn = dn->is_new();
+
+ // unlink
+ assert(dn->get_projected_linkage()->is_null());
+ dn->dir->unlink_inode(dn, !new_dn);
+ dn->pop_projected_linkage();
+ dn->mark_dirty(pdv, ls);
+
+ dn->dir->pop_and_dirty_projected_fnode(ls);
+
+ in->state_clear(CInode::STATE_ORPHAN);
+ dn->state_clear(CDentry::STATE_PURGING | CDentry::STATE_PURGINGPINNED);
+ dn->put(CDentry::PIN_PURGING);
+
+ // drop dentry?
+ if (new_dn) {
+ dout(20) << " dn is new, removing" << dendl;
+ dn->mark_clean();
+ dn->dir->remove_dentry(dn);
+ }
+
+ // drop inode
+ if (in->is_dirty())
+ in->mark_clean();
+ in->mdcache->remove_inode(in);
+}
+
+void StrayManager::enqueue(CDentry *dn, bool trunc)
+{
+ CDentry::linkage_t *dnl = dn->get_projected_linkage();
+ assert(dnl);
+ CInode *in = dnl->get_inode();
+ assert(in);
+
+ /* We consider a stray to be purging as soon as it is enqueued, to avoid
+ * enqueing it twice */
+ dn->state_set(CDentry::STATE_PURGING);
+ in->state_set(CInode::STATE_PURGING);
+
+ /* We must clear this as soon as enqueuing it, to prevent the journal
+ * expiry code from seeing a dirty parent and trying to write a backtrace */
+ if (!trunc) {
+ if (in->is_dirty_parent()) {
+ in->clear_dirty_parent();
+ }
+ }
+
+ dout(20) << __func__ << ": purging dn: " << *dn << dendl;
+
+ if (!dn->state_test(CDentry::STATE_PURGINGPINNED)) {
+ dn->get(CDentry::PIN_PURGING);
+ dn->state_set(CDentry::STATE_PURGINGPINNED);
+ }
+
+ ++num_strays_enqueuing;
+ logger->set(l_mdc_num_strays_enqueuing, num_strays_enqueuing);
+
+ // Resources are available, acquire them and execute the purge
+ _enqueue(dn, trunc);
+
+ dout(10) << __func__ << ": purging this dentry immediately: "
+ << *dn << dendl;
+}
+
+class C_OpenSnapParents : public StrayManagerContext {
+ CDentry *dn;
+ bool trunc;
+ public:
+ C_OpenSnapParents(StrayManager *sm_, CDentry *dn_, bool t) :
+ StrayManagerContext(sm_), dn(dn_), trunc(t) { }
+ void finish(int r) override {
+ sm->_enqueue(dn, trunc);
+ }
+};
+
+void StrayManager::_enqueue(CDentry *dn, bool trunc)
+{
+ assert(started);
+
+ CInode *in = dn->get_linkage()->get_inode();
+ if (in->snaprealm &&
+ !in->snaprealm->have_past_parents_open() &&
+ !in->snaprealm->open_parents(new C_OpenSnapParents(this, dn, trunc))) {
+ // this can happen if the dentry had been trimmed from cache.
+ return;
+ }
+
+ if (trunc) {
+ truncate(dn);
+ } else {
+ purge(dn);
+ }
+}
+
+
+void StrayManager::advance_delayed()
+{
+ if (!started)
+ return;
+
+ for (elist<CDentry*>::iterator p = delayed_eval_stray.begin(); !p.end(); ) {
+ CDentry *dn = *p;
+ ++p;
+ dn->item_stray.remove_myself();
+ num_strays_delayed--;
+
+ if (dn->get_projected_linkage()->is_null()) {
+ /* A special case: a stray dentry can go null if its inode is being
+ * re-linked into another MDS's stray dir during a shutdown migration. */
+ dout(4) << __func__ << ": delayed dentry is now null: " << *dn << dendl;
+ continue;
+ }
+
+ const bool purging = eval_stray(dn);
+ if (!purging) {
+ derr << "Dentry " << *dn << " was purgeable but no longer is!" << dendl;
+ /*
+ * This can happen if a stray is purgeable, but has gained an extra
+ * reference by virtue of having its backtrace updated.
+ * FIXME perhaps we could simplify this further by
+ * avoiding writing the backtrace of purge-ready strays, so
+ * that this code could be more rigid?
+ */
+ }
+ }
+ logger->set(l_mdc_num_strays_delayed, num_strays_delayed);
+}
+
+void StrayManager::set_num_strays(uint64_t num)
+{
+ assert(!started);
+ num_strays = num;
+ logger->set(l_mdc_num_strays, num_strays);
+}
+
+void StrayManager::notify_stray_created()
+{
+ num_strays++;
+ logger->set(l_mdc_num_strays, num_strays);
+ logger->inc(l_mdc_strays_created);
+}
+
+void StrayManager::notify_stray_removed()
+{
+ num_strays--;
+ logger->set(l_mdc_num_strays, num_strays);
+}
+
+struct C_EvalStray : public StrayManagerContext {
+ CDentry *dn;
+ C_EvalStray(StrayManager *sm_, CDentry *d) : StrayManagerContext(sm_), dn(d) {}
+ void finish(int r) override {
+ sm->eval_stray(dn);
+ }
+};
+
+struct C_MDC_EvalStray : public StrayManagerContext {
+ CDentry *dn;
+ C_MDC_EvalStray(StrayManager *sm_, CDentry *d) : StrayManagerContext(sm_), dn(d) {}
+ void finish(int r) override {
+ sm->eval_stray(dn);
+ }
+};
+
+bool StrayManager::_eval_stray(CDentry *dn, bool delay)
+{
+ dout(10) << "eval_stray " << *dn << dendl;
+ CDentry::linkage_t *dnl = dn->get_projected_linkage();
+ assert(dnl->is_primary());
+ dout(10) << " inode is " << *dnl->get_inode() << dendl;
+ CInode *in = dnl->get_inode();
+ assert(in);
+ assert(!in->state_test(CInode::STATE_REJOINUNDEF));
+
+ // The only dentries elegible for purging are those
+ // in the stray directories
+ assert(dn->get_dir()->get_inode()->is_stray());
+
+ // Inode may not pass through this function if it
+ // was already identified for purging (i.e. cannot
+ // call eval_stray() after purge()
+ assert(!dn->state_test(CDentry::STATE_PURGING));
+
+ if (!dn->is_auth()) {
+ return false;
+ }
+
+ if (!started)
+ delay = true;
+
+ if (dn->item_stray.is_on_list()) {
+ if (delay)
+ return false;
+
+ dn->item_stray.remove_myself();
+ num_strays_delayed--;
+ logger->set(l_mdc_num_strays_delayed, num_strays_delayed);
+ }
+
+ // purge?
+ if (in->inode.nlink == 0) {
+ // past snaprealm parents imply snapped dentry remote links.
+ // only important for directories. normal file data snaps are handled
+ // by the object store.
+ if (in->snaprealm) {
+ if (!in->snaprealm->have_past_parents_open() &&
+ !in->snaprealm->open_parents(new C_MDC_EvalStray(this, dn))) {
+ return false;
+ }
+ in->snaprealm->prune_past_parents();
+ in->purge_stale_snap_data(in->snaprealm->get_snaps());
+ }
+ if (in->is_dir()) {
+ if (in->snaprealm && in->snaprealm->has_past_parents()) {
+ dout(20) << " directory has past parents "
+ << in->snaprealm->srnode.past_parents << dendl;
+ if (in->state_test(CInode::STATE_MISSINGOBJS)) {
+ mds->clog->error() << "previous attempt at committing dirfrag of ino "
+ << in->ino() << " has failed, missing object";
+ mds->handle_write_error(-ENOENT);
+ }
+ return false; // not until some snaps are deleted.
+ }
+
+ in->mdcache->clear_dirty_bits_for_stray(in);
+
+ if (!in->remote_parents.empty()) {
+ // unlink any stale remote snap dentry.
+ for (compact_set<CDentry*>::iterator p = in->remote_parents.begin();
+ p != in->remote_parents.end(); ) {
+ CDentry *remote_dn = *p;
+ ++p;
+ assert(remote_dn->last != CEPH_NOSNAP);
+ remote_dn->unlink_remote(remote_dn->get_linkage());
+ }
+ }
+ }
+ if (dn->is_replicated()) {
+ dout(20) << " replicated" << dendl;
+ return false;
+ }
+ if (dn->is_any_leases() || in->is_any_caps()) {
+ dout(20) << " caps | leases" << dendl;
+ return false; // wait
+ }
+ if (in->state_test(CInode::STATE_NEEDSRECOVER) ||
+ in->state_test(CInode::STATE_RECOVERING)) {
+ dout(20) << " pending recovery" << dendl;
+ return false; // don't mess with file size probing
+ }
+ if (in->get_num_ref() > (int)in->is_dirty() + (int)in->is_dirty_parent()) {
+ dout(20) << " too many inode refs" << dendl;
+ return false;
+ }
+ if (dn->get_num_ref() > (int)dn->is_dirty() + !!in->get_num_ref()) {
+ dout(20) << " too many dn refs" << dendl;
+ return false;
+ }
+ if (delay) {
+ if (!dn->item_stray.is_on_list()) {
+ delayed_eval_stray.push_back(&dn->item_stray);
+ num_strays_delayed++;
+ logger->set(l_mdc_num_strays_delayed, num_strays_delayed);
+ }
+ // don't purge multiversion inode with snap data
+ } else if (in->snaprealm && in->snaprealm->has_past_parents() &&
+ !in->old_inodes.empty()) {
+ // A file with snapshots: we will truncate the HEAD revision
+ // but leave the metadata intact.
+ assert(!in->is_dir());
+ dout(20) << " file has past parents "
+ << in->snaprealm->srnode.past_parents << dendl;
+ if (in->is_file() && in->get_projected_inode()->size > 0) {
+ enqueue(dn, true); // truncate head objects
+ }
+ } else {
+ // A straightforward file, ready to be purged. Enqueue it.
+ if (in->is_dir()) {
+ in->close_dirfrags();
+ }
+
+ enqueue(dn, false);
+ }
+
+ return true;
+ } else {
+ /*
+ * Where a stray has some links, they should be remotes, check
+ * if we can do anything with them if we happen to have them in
+ * cache.
+ */
+ _eval_stray_remote(dn, NULL);
+ return false;
+ }
+}
+
+void StrayManager::activate()
+{
+ dout(10) << __func__ << dendl;
+ started = true;
+ purge_queue.activate();
+}
+
+bool StrayManager::eval_stray(CDentry *dn, bool delay)
+{
+ // avoid nested eval_stray
+ if (dn->state_test(CDentry::STATE_EVALUATINGSTRAY))
+ return false;
+
+ dn->state_set(CDentry::STATE_EVALUATINGSTRAY);
+ bool ret = _eval_stray(dn, delay);
+ dn->state_clear(CDentry::STATE_EVALUATINGSTRAY);
+ return ret;
+}
+
+void StrayManager::eval_remote(CDentry *remote_dn)
+{
+ dout(10) << __func__ << " " << *remote_dn << dendl;
+
+ CDentry::linkage_t *dnl = remote_dn->get_projected_linkage();
+ assert(dnl->is_remote());
+ CInode *in = dnl->get_inode();
+
+ if (!in) {
+ dout(20) << __func__ << ": no inode, cannot evaluate" << dendl;
+ return;
+ }
+
+ if (remote_dn->last != CEPH_NOSNAP) {
+ dout(20) << __func__ << ": snap dentry, cannot evaluate" << dendl;
+ return;
+ }
+
+ // refers to stray?
+ CDentry *primary_dn = in->get_projected_parent_dn();
+ assert(primary_dn != NULL);
+ if (primary_dn->get_dir()->get_inode()->is_stray()) {
+ _eval_stray_remote(primary_dn, remote_dn);
+ } else {
+ dout(20) << __func__ << ": inode's primary dn not stray" << dendl;
+ }
+}
+
+class C_RetryEvalRemote : public StrayManagerContext {
+ CDentry *dn;
+ public:
+ C_RetryEvalRemote(StrayManager *sm_, CDentry *dn_) :
+ StrayManagerContext(sm_), dn(dn_) {
+ dn->get(CDentry::PIN_PTRWAITER);
+ }
+ void finish(int r) override {
+ if (dn->get_projected_linkage()->is_remote())
+ sm->eval_remote(dn);
+ dn->put(CDentry::PIN_PTRWAITER);
+ }
+};
+
+void StrayManager::_eval_stray_remote(CDentry *stray_dn, CDentry *remote_dn)
+{
+ dout(20) << __func__ << " " << *stray_dn << dendl;
+ assert(stray_dn != NULL);
+ assert(stray_dn->get_dir()->get_inode()->is_stray());
+ CDentry::linkage_t *stray_dnl = stray_dn->get_projected_linkage();
+ assert(stray_dnl->is_primary());
+ CInode *stray_in = stray_dnl->get_inode();
+ assert(stray_in->inode.nlink >= 1);
+ assert(stray_in->last == CEPH_NOSNAP);
+
+ /* If no remote_dn hinted, pick one arbitrarily */
+ if (remote_dn == NULL) {
+ if (!stray_in->remote_parents.empty()) {
+ for (compact_set<CDentry*>::iterator p = stray_in->remote_parents.begin();
+ p != stray_in->remote_parents.end();
+ ++p)
+ if ((*p)->last == CEPH_NOSNAP && !(*p)->is_projected()) {
+ if ((*p)->is_auth()) {
+ remote_dn = *p;
+ if (remote_dn->dir->can_auth_pin())
+ break;
+ } else if (!remote_dn) {
+ remote_dn = *p;
+ }
+ }
+ }
+ if (!remote_dn) {
+ dout(20) << __func__ << ": not reintegrating (no remote parents in cache)" << dendl;
+ return;
+ }
+ }
+ assert(remote_dn->last == CEPH_NOSNAP);
+ // NOTE: we repeat this check in _rename(), since our submission path is racey.
+ if (!remote_dn->is_projected()) {
+ if (remote_dn->is_auth()) {
+ if (remote_dn->dir->can_auth_pin()) {
+ reintegrate_stray(stray_dn, remote_dn);
+ } else {
+ remote_dn->dir->add_waiter(CDir::WAIT_UNFREEZE, new C_RetryEvalRemote(this, remote_dn));
+ dout(20) << __func__ << ": not reintegrating (can't authpin remote parent)" << dendl;
+ }
+
+ } else if (!remote_dn->is_auth() && stray_dn->is_auth()) {
+ migrate_stray(stray_dn, remote_dn->authority().first);
+ } else {
+ dout(20) << __func__ << ": not reintegrating" << dendl;
+ }
+ } else {
+ // don't do anything if the remote parent is projected, or we may
+ // break user-visible semantics!
+ dout(20) << __func__ << ": not reintegrating (projected)" << dendl;
+ }
+}
+
+void StrayManager::reintegrate_stray(CDentry *straydn, CDentry *rdn)
+{
+ dout(10) << __func__ << " " << *straydn << " into " << *rdn << dendl;
+
+ logger->inc(l_mdc_strays_reintegrated);
+
+ // rename it to another mds.
+ filepath src;
+ straydn->make_path(src);
+ filepath dst;
+ rdn->make_path(dst);
+
+ MClientRequest *req = new MClientRequest(CEPH_MDS_OP_RENAME);
+ req->set_filepath(dst);
+ req->set_filepath2(src);
+ req->set_tid(mds->issue_tid());
+
+ mds->send_message_mds(req, rdn->authority().first);
+}
+
+void StrayManager::migrate_stray(CDentry *dn, mds_rank_t to)
+{
+ CInode *in = dn->get_projected_linkage()->get_inode();
+ assert(in);
+ CInode *diri = dn->dir->get_inode();
+ assert(diri->is_stray());
+ dout(10) << "migrate_stray from mds." << MDS_INO_STRAY_OWNER(diri->inode.ino)
+ << " to mds." << to
+ << " " << *dn << " " << *in << dendl;
+
+ logger->inc(l_mdc_strays_migrated);
+
+ // rename it to another mds.
+ filepath src;
+ dn->make_path(src);
+ assert(src.depth() == 2);
+
+ filepath dst(MDS_INO_MDSDIR(to));
+ dst.push_dentry(src[0]);
+ dst.push_dentry(src[1]);
+
+ MClientRequest *req = new MClientRequest(CEPH_MDS_OP_RENAME);
+ req->set_filepath(dst);
+ req->set_filepath2(src);
+ req->set_tid(mds->issue_tid());
+
+ mds->send_message_mds(req, to);
+}
+
+StrayManager::StrayManager(MDSRank *mds, PurgeQueue &purge_queue_)
+ : delayed_eval_stray(member_offset(CDentry, item_stray)),
+ mds(mds), logger(NULL), started(false), num_strays(0),
+ num_strays_delayed(0), num_strays_enqueuing(0),
+ purge_queue(purge_queue_)
+{
+ assert(mds != NULL);
+}
+
+void StrayManager::truncate(CDentry *dn)
+{
+ const CDentry::linkage_t *dnl = dn->get_projected_linkage();
+ const CInode *in = dnl->get_inode();
+ assert(in);
+ dout(10) << __func__ << ": " << *dn << " " << *in << dendl;
+ assert(!dn->is_replicated());
+
+ const SnapRealm *realm = in->find_snaprealm();
+ assert(realm);
+ dout(10) << " realm " << *realm << dendl;
+ const SnapContext *snapc = &realm->get_snap_context();
+
+ uint64_t to = in->inode.get_max_size();
+ to = MAX(in->inode.size, to);
+ // when truncating a file, the filer does not delete stripe objects that are
+ // truncated to zero. so we need to purge stripe objects up to the max size
+ // the file has ever been.
+ to = MAX(in->inode.max_size_ever, to);
+
+ assert(to > 0);
+
+ PurgeItem item;
+ item.ino = in->inode.ino;
+ item.layout = in->inode.layout;
+ item.snapc = *snapc;
+ item.size = to;
+
+ purge_queue.push(item, new C_IO_PurgeStrayPurged(
+ this, dn, true));
+}
+
+void StrayManager::_truncate_stray_logged(CDentry *dn, LogSegment *ls)
+{
+ CInode *in = dn->get_projected_linkage()->get_inode();
+
+ dout(10) << __func__ << ": " << *dn << " " << *in << dendl;
+
+ dn->state_clear(CDentry::STATE_PURGING | CDentry::STATE_PURGINGPINNED);
+ dn->put(CDentry::PIN_PURGING);
+
+ in->pop_and_dirty_projected_inode(ls);
+
+ eval_stray(dn);
+}
+
Code Review / stor4nfv.git / blobdiff