/*
- * DEBUG: section 47 Store Directory Routines
+ * Copyright (C) 1996-2020 The Squid Software Foundation and contributors
+ *
+ * Squid software is distributed under GPLv2+ license and includes
+ * contributions from numerous individuals and organizations.
+ * Please see the COPYING and CONTRIBUTORS files for details.
*/
+/* DEBUG: section 47 Store Directory Routines */
+
#include "squid.h"
#include "cache_cf.h"
#include "CollapsedForwarding.h"
#include "DiskIO/DiskIOStrategy.h"
#include "DiskIO/ReadRequest.h"
#include "DiskIO/WriteRequest.h"
-#include "fs/rock/RockSwapDir.h"
-#include "fs/rock/RockIoState.h"
+#include "fs/rock/RockHeaderUpdater.h"
#include "fs/rock/RockIoRequests.h"
+#include "fs/rock/RockIoState.h"
#include "fs/rock/RockRebuild.h"
+#include "fs/rock/RockSwapDir.h"
#include "globals.h"
#include "ipc/mem/Pages.h"
#include "MemObject.h"
#include <cstdlib>
#include <iomanip>
+#include <limits>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
const int64_t Rock::SwapDir::HeaderSize = 16*1024;
-Rock::SwapDir::SwapDir(): ::SwapDir("rock"),
+Rock::SwapDir::SwapDir(): ::SwapDir("rock"),
slotSize(HeaderSize), filePath(NULL), map(NULL), io(NULL),
waitingForPage(NULL)
{
safe_free(filePath);
}
-StoreSearch *
-Rock::SwapDir::search(String const url, HttpRequest *)
-{
- assert(false);
- return NULL; // XXX: implement
-}
-
-void
-Rock::SwapDir::get(String const key, STOREGETCLIENT cb, void *data)
-{
- ::SwapDir::get(key, cb, data);
-}
-
// called when Squid core needs a StoreEntry with a given key
StoreEntry *
Rock::SwapDir::get(const cache_key *key)
// create a brand new store entry and initialize it with stored basics
StoreEntry *e = new StoreEntry();
+ e->createMemObject();
anchorEntry(*e, filen, *slot);
-
- e->hashInsert(key);
trackReferences(*e);
-
return e;
- // the disk entry remains open for reading, protected from modifications
}
bool
-Rock::SwapDir::anchorCollapsed(StoreEntry &collapsed, bool &inSync)
+Rock::SwapDir::anchorToCache(StoreEntry &entry, bool &inSync)
{
if (!map || !theFile || !theFile->canRead())
return false;
sfileno filen;
const Ipc::StoreMapAnchor *const slot = map->openForReading(
- reinterpret_cast<cache_key*>(collapsed.key), filen);
+ reinterpret_cast<cache_key*>(entry.key), filen);
if (!slot)
return false;
- anchorEntry(collapsed, filen, *slot);
- inSync = updateCollapsedWith(collapsed, *slot);
+ anchorEntry(entry, filen, *slot);
+ inSync = updateAnchoredWith(entry, *slot);
return true; // even if inSync is false
}
bool
-Rock::SwapDir::updateCollapsed(StoreEntry &collapsed)
+Rock::SwapDir::updateAnchored(StoreEntry &entry)
{
if (!map || !theFile || !theFile->canRead())
return false;
- if (collapsed.swap_filen < 0) // no longer using a disk cache
- return true;
- assert(collapsed.swap_dirn == index);
+ assert(entry.hasDisk(index));
- const Ipc::StoreMapAnchor &s = map->readableEntry(collapsed.swap_filen);
- return updateCollapsedWith(collapsed, s);
+ const Ipc::StoreMapAnchor &s = map->readableEntry(entry.swap_filen);
+ return updateAnchoredWith(entry, s);
}
bool
-Rock::SwapDir::updateCollapsedWith(StoreEntry &collapsed, const Ipc::StoreMapAnchor &anchor)
+Rock::SwapDir::updateAnchoredWith(StoreEntry &entry, const Ipc::StoreMapAnchor &anchor)
{
- collapsed.swap_file_sz = anchor.basics.swap_file_sz;
+ entry.swap_file_sz = anchor.basics.swap_file_sz;
return true;
}
void
Rock::SwapDir::anchorEntry(StoreEntry &e, const sfileno filen, const Ipc::StoreMapAnchor &anchor)
{
- const Ipc::StoreMapAnchor::Basics &basics = anchor.basics;
+ anchor.exportInto(e);
- e.swap_file_sz = basics.swap_file_sz;
- e.lastref = basics.lastref;
- e.timestamp = basics.timestamp;
- e.expires = basics.expires;
- e.lastmod = basics.lastmod;
- e.refcount = basics.refcount;
- e.flags = basics.flags;
-
- if (anchor.complete()) {
- e.store_status = STORE_OK;
- e.swap_status = SWAPOUT_DONE;
- } else {
- e.store_status = STORE_PENDING;
- e.swap_status = SWAPOUT_WRITING; // even though another worker writes?
- }
+ const bool complete = anchor.complete();
+ e.store_status = complete ? STORE_OK : STORE_PENDING;
+ // SWAPOUT_WRITING: even though another worker writes?
+ e.attachToDisk(index, filen, complete ? SWAPOUT_DONE : SWAPOUT_WRITING);
e.ping_status = PING_NONE;
- EBIT_CLR(e.flags, RELEASE_REQUEST);
- EBIT_CLR(e.flags, KEY_PRIVATE);
EBIT_SET(e.flags, ENTRY_VALIDATED);
-
- e.swap_dirn = index;
- e.swap_filen = filen;
}
-
void Rock::SwapDir::disconnect(StoreEntry &e)
{
- assert(e.swap_dirn == index);
- assert(e.swap_filen >= 0);
- // cannot have SWAPOUT_NONE entry with swap_filen >= 0
- assert(e.swap_status != SWAPOUT_NONE);
+ assert(e.hasDisk(index));
+
+ ignoreReferences(e);
// do not rely on e.swap_status here because there is an async delay
// before it switches from SWAPOUT_WRITING to SWAPOUT_DONE.
// especially since we may switch from writing to reading. This code relies
// on Rock::IoState::writeableAnchor_ being set when we locked for writing.
if (e.mem_obj && e.mem_obj->swapout.sio != NULL &&
- dynamic_cast<IoState&>(*e.mem_obj->swapout.sio).writeableAnchor_) {
+ dynamic_cast<IoState&>(*e.mem_obj->swapout.sio).writeableAnchor_) {
map->abortWriting(e.swap_filen);
- e.swap_dirn = -1;
- e.swap_filen = -1;
- e.swap_status = SWAPOUT_NONE;
+ e.detachFromDisk();
dynamic_cast<IoState&>(*e.mem_obj->swapout.sio).writeableAnchor_ = NULL;
- Store::Root().transientsAbandon(e); // broadcasts after the change
+ Store::Root().stopSharing(e); // broadcasts after the change
} else {
map->closeForReading(e.swap_filen);
- e.swap_dirn = -1;
- e.swap_filen = -1;
- e.swap_status = SWAPOUT_NONE;
+ e.detachFromDisk();
}
}
Rock::SwapDir::currentSize() const
{
const uint64_t spaceSize = !freeSlots ?
- maxSize() : (slotSize * freeSlots->size());
+ maxSize() : (slotSize * freeSlots->size());
// everything that is not free is in use
return maxSize() - spaceSize;
}
}
void
-Rock::SwapDir::swappedOut(const StoreEntry &)
+Rock::SwapDir::finalizeSwapoutSuccess(const StoreEntry &)
+{
+ // nothing to do
+}
+
+void
+Rock::SwapDir::finalizeSwapoutFailure(StoreEntry &entry)
+{
+ debugs(47, 5, entry);
+ disconnect(entry); // calls abortWriting() to free the disk entry
+}
+
+int64_t
+Rock::SwapDir::slotLimitAbsolute() const
+{
+ // the max value is an invalid one; all values must be below the limit
+ assert(std::numeric_limits<Ipc::StoreMapSliceId>::max() ==
+ std::numeric_limits<SlotId>::max());
+ return std::numeric_limits<SlotId>::max();
+}
+
+int64_t
+Rock::SwapDir::slotLimitActual() const
{
- // stats are not stored but computed when needed
+ const int64_t sWanted = (maxSize() - HeaderSize)/slotSize;
+ const int64_t sLimitLo = map ? map->sliceLimit() : 0; // dynamic shrinking unsupported
+ const int64_t sLimitHi = slotLimitAbsolute();
+ return min(max(sLimitLo, sWanted), sLimitHi);
}
int64_t
-Rock::SwapDir::entryLimitAllowed() const
+Rock::SwapDir::entryLimitActual() const
{
- const int64_t eLimitLo = map ? map->entryLimit() : 0; // dynamic shrinking unsupported
- const int64_t eWanted = (maxSize() - HeaderSize)/slotSize;
- return min(max(eLimitLo, eWanted), entryLimitHigh());
+ return min(slotLimitActual(), entryLimitAbsolute());
}
-// TODO: encapsulate as a tool; identical to CossSwapDir::create()
+// TODO: encapsulate as a tool
void
Rock::SwapDir::create()
{
// report Rock DB creation error and exit
void
-Rock::SwapDir::createError(const char *const msg) {
+Rock::SwapDir::createError(const char *const msg)
+{
+ int xerrno = errno; // XXX: where does errno come from?
debugs(47, DBG_CRITICAL, "ERROR: Failed to initialize Rock Store db in " <<
- filePath << "; " << msg << " error: " << xstrerror());
+ filePath << "; " << msg << " error: " << xstrerr(xerrno));
fatal("Rock Store db creation error");
}
ConfigOption *
Rock::SwapDir::getOptionTree() const
{
- ConfigOptionVector *vector = dynamic_cast<ConfigOptionVector*>(::SwapDir::getOptionTree());
- assert(vector);
- vector->options.push_back(new ConfigOptionAdapter<SwapDir>(*const_cast<SwapDir *>(this), &SwapDir::parseSizeOption, &SwapDir::dumpSizeOption));
- vector->options.push_back(new ConfigOptionAdapter<SwapDir>(*const_cast<SwapDir *>(this), &SwapDir::parseTimeOption, &SwapDir::dumpTimeOption));
- vector->options.push_back(new ConfigOptionAdapter<SwapDir>(*const_cast<SwapDir *>(this), &SwapDir::parseRateOption, &SwapDir::dumpRateOption));
- return vector;
+ ConfigOption *copt = ::SwapDir::getOptionTree();
+ ConfigOptionVector *vector = dynamic_cast<ConfigOptionVector*>(copt);
+ if (vector) {
+ // if copt is actually a ConfigOptionVector
+ vector->options.push_back(new ConfigOptionAdapter<SwapDir>(*const_cast<SwapDir *>(this), &SwapDir::parseSizeOption, &SwapDir::dumpSizeOption));
+ vector->options.push_back(new ConfigOptionAdapter<SwapDir>(*const_cast<SwapDir *>(this), &SwapDir::parseTimeOption, &SwapDir::dumpTimeOption));
+ vector->options.push_back(new ConfigOptionAdapter<SwapDir>(*const_cast<SwapDir *>(this), &SwapDir::parseRateOption, &SwapDir::dumpRateOption));
+ } else {
+ // we don't know how to handle copt, as it's not a ConfigOptionVector.
+ // free it (and return nullptr)
+ delete copt;
+ copt = nullptr;
+ }
+ return copt;
}
bool
else
return false;
- if (!value)
+ if (!value) {
self_destruct();
+ return false;
+ }
// TODO: handle time units and detect parsing errors better
const int64_t parsedValue = strtoll(value, NULL, 10);
if (parsedValue < 0) {
debugs(3, DBG_CRITICAL, "FATAL: cache_dir " << path << ' ' << option << " must not be negative but is: " << parsedValue);
self_destruct();
+ return false;
}
const time_msec_t newTime = static_cast<time_msec_t>(parsedValue);
else
return false;
- if (!value)
+ if (!value) {
self_destruct();
+ return false;
+ }
// TODO: handle time units and detect parsing errors better
const int64_t parsedValue = strtoll(value, NULL, 10);
if (parsedValue < 0) {
debugs(3, DBG_CRITICAL, "FATAL: cache_dir " << path << ' ' << option << " must not be negative but is: " << parsedValue);
self_destruct();
+ return false;
}
const int newRate = static_cast<int>(parsedValue);
if (newRate < 0) {
debugs(3, DBG_CRITICAL, "FATAL: cache_dir " << path << ' ' << option << " must not be negative but is: " << newRate);
self_destruct();
+ return false;
}
if (!isaReconfig)
else
return false;
- if (!value)
+ if (!value) {
self_destruct();
+ return false;
+ }
// TODO: handle size units and detect parsing errors better
const uint64_t newSize = strtoll(value, NULL, 10);
if (newSize <= 0) {
debugs(3, DBG_CRITICAL, "FATAL: cache_dir " << path << ' ' << option << " must be positive; got: " << newSize);
self_destruct();
+ return false;
}
if (newSize <= sizeof(DbCellHeader)) {
debugs(3, DBG_CRITICAL, "FATAL: cache_dir " << path << ' ' << option << " must exceed " << sizeof(DbCellHeader) << "; got: " << newSize);
self_destruct();
+ return false;
}
if (!reconfig)
const int64_t slotSizeRoundingWaste = slotSize;
const int64_t maxRoundingWaste =
max(maxSizeRoundingWaste, slotSizeRoundingWaste);
- const int64_t usableDiskSize = diskOffset(entryLimitAllowed());
- const int64_t diskWasteSize = maxSize() - usableDiskSize;
- Must(diskWasteSize >= 0);
-
- // warn if maximum db size is not reachable due to sfileno limit
- if (entryLimitAllowed() == entryLimitHigh() &&
- diskWasteSize >= maxRoundingWaste) {
- debugs(47, DBG_CRITICAL, "Rock store cache_dir[" << index << "] '" << path << "':");
- debugs(47, DBG_CRITICAL, "\tmaximum number of entries: " << entryLimitAllowed());
- debugs(47, DBG_CRITICAL, "\tdb slot size: " << slotSize << " Bytes");
- debugs(47, DBG_CRITICAL, "\tmaximum db size: " << maxSize() << " Bytes");
- debugs(47, DBG_CRITICAL, "\tusable db size: " << usableDiskSize << " Bytes");
- debugs(47, DBG_CRITICAL, "\tdisk space waste: " << diskWasteSize << " Bytes");
- debugs(47, DBG_CRITICAL, "WARNING: Rock store config wastes space.");
+
+ // an entry consumes at least one slot; round up to reduce false warnings
+ const int64_t blockSize = static_cast<int64_t>(slotSize);
+ const int64_t maxObjSize = max(blockSize,
+ ((maxObjectSize()+blockSize-1)/blockSize)*blockSize);
+
+ // Does the "sfileno*max-size" limit match configured db capacity?
+ const double entriesMayOccupy = entryLimitAbsolute()*static_cast<double>(maxObjSize);
+ if (entriesMayOccupy + maxRoundingWaste < maxSize()) {
+ const int64_t diskWasteSize = maxSize() - static_cast<int64_t>(entriesMayOccupy);
+ debugs(47, DBG_CRITICAL, "WARNING: Rock cache_dir " << path << " wastes disk space due to entry limits:" <<
+ "\n\tconfigured db capacity: " << maxSize() << " bytes" <<
+ "\n\tconfigured db slot size: " << slotSize << " bytes" <<
+ "\n\tconfigured maximum entry size: " << maxObjectSize() << " bytes" <<
+ "\n\tmaximum number of cache_dir entries supported by Squid: " << entryLimitAbsolute() <<
+ "\n\tdisk space all entries may use: " << entriesMayOccupy << " bytes" <<
+ "\n\tdisk space wasted: " << diskWasteSize << " bytes");
+ }
+
+ // Does the "absolute slot count" limit match configured db capacity?
+ const double slotsMayOccupy = slotLimitAbsolute()*static_cast<double>(slotSize);
+ if (slotsMayOccupy + maxRoundingWaste < maxSize()) {
+ const int64_t diskWasteSize = maxSize() - static_cast<int64_t>(entriesMayOccupy);
+ debugs(47, DBG_CRITICAL, "WARNING: Rock cache_dir " << path << " wastes disk space due to slot limits:" <<
+ "\n\tconfigured db capacity: " << maxSize() << " bytes" <<
+ "\n\tconfigured db slot size: " << slotSize << " bytes" <<
+ "\n\tmaximum number of rock cache_dir slots supported by Squid: " << slotLimitAbsolute() <<
+ "\n\tdisk space all slots may use: " << slotsMayOccupy << " bytes" <<
+ "\n\tdisk space wasted: " << diskWasteSize << " bytes");
}
}
bool
Rock::SwapDir::canStore(const StoreEntry &e, int64_t diskSpaceNeeded, int &load) const
{
- if (!::SwapDir::canStore(e, sizeof(DbCellHeader)+diskSpaceNeeded, load))
+ if (diskSpaceNeeded >= 0)
+ diskSpaceNeeded += sizeof(DbCellHeader);
+ if (!::SwapDir::canStore(e, diskSpaceNeeded, load))
return false;
if (!theFile || !theFile->canWrite())
return sio;
}
+StoreIOState::Pointer
+Rock::SwapDir::createUpdateIO(const Ipc::StoreMapUpdate &update, StoreIOState::STFNCB *cbFile, StoreIOState::STIOCB *cbIo, void *data)
+{
+ if (!theFile || theFile->error()) {
+ debugs(47,4, theFile);
+ return nullptr;
+ }
+
+ Must(update.fresh);
+ Must(update.fresh.fileNo >= 0);
+
+ Rock::SwapDir::Pointer self(this);
+ IoState *sio = new IoState(self, update.entry, cbFile, cbIo, data);
+
+ sio->swap_dirn = index;
+ sio->swap_filen = update.fresh.fileNo;
+ sio->writeableAnchor_ = update.fresh.anchor;
+
+ debugs(47,5, "dir " << index << " updating filen " <<
+ std::setfill('0') << std::hex << std::uppercase << std::setw(8) <<
+ sio->swap_filen << std::dec << " starting at " <<
+ diskOffset(sio->swap_filen));
+
+ sio->file(theFile);
+ return sio;
+}
+
int64_t
-Rock::SwapDir::diskOffset(int filen) const
+Rock::SwapDir::diskOffset(const SlotId sid) const
{
- assert(filen >= 0);
- return HeaderSize + slotSize*filen;
+ assert(sid >= 0);
+ return HeaderSize + slotSize*sid;
}
int64_t
Rock::SwapDir::diskOffsetLimit() const
{
assert(map);
- return diskOffset(map->entryLimit());
-}
-
-int
-Rock::SwapDir::entryMaxPayloadSize() const
-{
- return slotSize - sizeof(DbCellHeader);
+ return diskOffset(map->sliceLimit());
}
-int
-Rock::SwapDir::entriesNeeded(const int64_t objSize) const
+Rock::SlotId
+Rock::SwapDir::reserveSlotForWriting()
{
- return (objSize + entryMaxPayloadSize() - 1) / entryMaxPayloadSize();
-}
+ Ipc::Mem::PageId pageId;
-bool
-Rock::SwapDir::useFreeSlot(Ipc::Mem::PageId &pageId)
-{
if (freeSlots->pop(pageId)) {
- debugs(47, 5, "got a previously free slot: " << pageId);
- return true;
+ const auto slotId = pageId.number - 1;
+ debugs(47, 5, "got a previously free slot: " << slotId);
+ map->prepFreeSlice(slotId);
+ return slotId;
}
// catch free slots delivered to noteFreeMapSlice()
if (map->purgeOne()) {
assert(!waitingForPage); // noteFreeMapSlice() should have cleared it
assert(pageId.set());
- debugs(47, 5, "got a previously busy slot: " << pageId);
- return true;
+ const auto slotId = pageId.number - 1;
+ debugs(47, 5, "got a previously busy slot: " << slotId);
+ map->prepFreeSlice(slotId);
+ return slotId;
}
assert(waitingForPage == &pageId);
waitingForPage = NULL;
+ // This may happen when the number of available db slots is close to the
+ // number of concurrent requests reading or writing those slots, which may
+ // happen when the db is "small" compared to the request traffic OR when we
+ // are rebuilding and have not loaded "many" entries or empty slots yet.
debugs(47, 3, "cannot get a slot; entries: " << map->entryCount());
- return false;
+ throw TexcHere("ran out of free db slots");
}
bool
Rock::SwapDir::validSlotId(const SlotId slotId) const
{
- return 0 <= slotId && slotId < entryLimitAllowed();
+ return 0 <= slotId && slotId < slotLimitActual();
}
void
-Rock::SwapDir::noteFreeMapSlice(const sfileno sliceId)
+Rock::SwapDir::noteFreeMapSlice(const Ipc::StoreMapSliceId sliceId)
{
Ipc::Mem::PageId pageId;
- pageId.pool = index+1;
+ pageId.pool = Ipc::Mem::PageStack::IdForSwapDirSpace(index);
pageId.number = sliceId+1;
if (waitingForPage) {
*waitingForPage = pageId;
return NULL;
}
- if (e.swap_filen < 0) {
+ if (!e.hasDisk()) {
debugs(47,4, HERE << e);
return NULL;
}
if (!theFile)
fatalf("Rock cache_dir failed to initialize db file: %s", filePath);
- if (theFile->error())
+ if (theFile->error()) {
+ int xerrno = errno; // XXX: where does errno come from
fatalf("Rock cache_dir at %s failed to open db file: %s", filePath,
- xstrerror());
+ xstrerr(xerrno));
+ }
debugs(47, 2, "Rock cache_dir[" << index << "] limits: " <<
- std::setw(12) << maxSize() << " disk bytes and " <<
- std::setw(7) << map->entryLimit() << " entries");
+ std::setw(12) << maxSize() << " disk bytes, " <<
+ std::setw(7) << map->entryLimit() << " entries, and " <<
+ std::setw(7) << map->sliceLimit() << " slots");
rebuild();
}
}
void
-Rock::SwapDir::readCompleted(const char *buf, int rlen, int errflag, RefCount< ::ReadRequest> r)
+Rock::SwapDir::readCompleted(const char *, int rlen, int errflag, RefCount< ::ReadRequest> r)
{
ReadRequest *request = dynamic_cast<Rock::ReadRequest*>(r.getRaw());
assert(request);
IoState::Pointer sio = request->sio;
-
- if (errflag == DISK_OK && rlen > 0)
- sio->offset_ += rlen;
-
- sio->callReaderBack(r->buf, rlen);
+ sio->handleReadCompletion(*request, rlen, errflag);
}
void
-Rock::SwapDir::writeCompleted(int errflag, size_t rlen, RefCount< ::WriteRequest> r)
+Rock::SwapDir::writeCompleted(int errflag, size_t, RefCount< ::WriteRequest> r)
{
+ // TODO: Move details into IoState::handleWriteCompletion() after figuring
+ // out how to deal with map access. See readCompleted().
+
Rock::WriteRequest *request = dynamic_cast<Rock::WriteRequest*>(r.getRaw());
assert(request);
assert(request->sio != NULL);
// quit if somebody called IoState::close() while we were waiting
if (!sio.stillWaiting()) {
debugs(79, 3, "ignoring closed entry " << sio.swap_filen);
- noteFreeMapSlice(request->sidNext);
+ noteFreeMapSlice(request->sidCurrent);
return;
}
- // TODO: Fail if disk dropped one of the previous write requests.
+ debugs(79, 7, "errflag=" << errflag << " rlen=" << request->len << " eof=" << request->eof);
- if (errflag == DISK_OK) {
- // do not increment sio.offset_ because we do it in sio->write()
+ if (errflag != DISK_OK)
+ handleWriteCompletionProblem(errflag, *request);
+ else if (!sio.expectedReply(request->id))
+ handleWriteCompletionProblem(DISK_ERROR, *request);
+ else
+ handleWriteCompletionSuccess(*request);
- // finalize the shared slice info after writing slice contents to disk
- Ipc::StoreMap::Slice &slice =
- map->writeableSlice(sio.swap_filen, request->sidCurrent);
- slice.size = request->len - sizeof(DbCellHeader);
- slice.next = request->sidNext;
-
- if (request->eof) {
- assert(sio.e);
- assert(sio.writeableAnchor_);
- sio.e->swap_file_sz = sio.writeableAnchor_->basics.swap_file_sz =
- sio.offset_;
+ if (sio.touchingStoreEntry())
+ CollapsedForwarding::Broadcast(*sio.e);
+}
- // close, the entry gets the read lock
- map->closeForWriting(sio.swap_filen, true);
- sio.writeableAnchor_ = NULL;
- sio.finishedWriting(errflag);
- }
+/// code shared by writeCompleted() success handling cases
+void
+Rock::SwapDir::handleWriteCompletionSuccess(const WriteRequest &request)
+{
+ auto &sio = *(request.sio);
+ sio.splicingPoint = request.sidCurrent;
+ // do not increment sio.offset_ because we do it in sio->write()
+
+ assert(sio.writeableAnchor_);
+ if (sio.writeableAnchor_->start < 0) { // wrote the first slot
+ Must(request.sidPrevious < 0);
+ sio.writeableAnchor_->start = request.sidCurrent;
} else {
- noteFreeMapSlice(request->sidNext);
+ Must(request.sidPrevious >= 0);
+ map->writeableSlice(sio.swap_filen, request.sidPrevious).next = request.sidCurrent;
+ }
- writeError(*sio.e);
- sio.finishedWriting(errflag);
- // and hope that Core will call disconnect() to close the map entry
+ // finalize the shared slice info after writing slice contents to disk;
+ // the chain gets possession of the slice we were writing
+ Ipc::StoreMap::Slice &slice =
+ map->writeableSlice(sio.swap_filen, request.sidCurrent);
+ slice.size = request.len - sizeof(DbCellHeader);
+ Must(slice.next < 0);
+
+ if (request.eof) {
+ assert(sio.e);
+ if (sio.touchingStoreEntry()) {
+ sio.e->swap_file_sz = sio.writeableAnchor_->basics.swap_file_sz =
+ sio.offset_;
+
+ map->switchWritingToReading(sio.swap_filen);
+ // sio.e keeps the (now read) lock on the anchor
+ }
+ sio.writeableAnchor_ = NULL;
+ sio.finishedWriting(DISK_OK);
}
+}
- CollapsedForwarding::Broadcast(*sio.e);
+/// code shared by writeCompleted() error handling cases
+void
+Rock::SwapDir::handleWriteCompletionProblem(const int errflag, const WriteRequest &request)
+{
+ auto &sio = *request.sio;
+
+ noteFreeMapSlice(request.sidCurrent);
+
+ writeError(sio);
+ sio.finishedWriting(errflag);
+ // and hope that Core will call disconnect() to close the map entry
}
void
-Rock::SwapDir::writeError(StoreEntry &e)
+Rock::SwapDir::writeError(StoreIOState &sio)
{
// Do not abortWriting here. The entry should keep the write lock
// instead of losing association with the store and confusing core.
- map->freeEntry(e.swap_filen); // will mark as unusable, just in case
+ map->freeEntry(sio.swap_filen); // will mark as unusable, just in case
- Store::Root().transientsAbandon(e);
+ if (sio.touchingStoreEntry())
+ Store::Root().stopSharing(*sio.e);
+ // else noop: a fresh entry update error does not affect stale entry readers
// All callers must also call IoState callback, to propagate the error.
}
+void
+Rock::SwapDir::updateHeaders(StoreEntry *updatedE)
+{
+ if (!map)
+ return;
+
+ Ipc::StoreMapUpdate update(updatedE);
+ if (!map->openForUpdating(update, updatedE->swap_filen))
+ return;
+
+ try {
+ AsyncJob::Start(new HeaderUpdater(this, update));
+ } catch (const std::exception &ex) {
+ debugs(20, 2, "error starting to update entry " << *updatedE << ": " << ex.what());
+ map->abortUpdating(update);
+ }
+}
+
bool
Rock::SwapDir::full() const
{
}
bool
-Rock::SwapDir::dereference(StoreEntry &e, bool)
+Rock::SwapDir::dereference(StoreEntry &e)
{
debugs(47, 5, HERE << &e << ' ' << e.swap_dirn << ' ' << e.swap_filen);
if (repl && repl->Dereferenced)
}
void
-Rock::SwapDir::unlink(StoreEntry &e)
+Rock::SwapDir::evictIfFound(const cache_key *key)
{
- debugs(47, 5, HERE << e);
- ignoreReferences(e);
- map->freeEntry(e.swap_filen);
- disconnect(e);
+ if (map)
+ map->freeEntryByKey(key); // may not be there
}
void
-Rock::SwapDir::markForUnlink(StoreEntry &e)
+Rock::SwapDir::evictCached(StoreEntry &e)
{
debugs(47, 5, e);
- map->freeEntry(e.swap_filen);
+ if (e.hasDisk(index)) {
+ if (map->freeEntry(e.swap_filen))
+ CollapsedForwarding::Broadcast(e);
+ if (!e.locked())
+ disconnect(e);
+ } else if (const auto key = e.publicKey()) {
+ evictIfFound(key);
+ }
}
void
currentSize() / 1024.0,
Math::doublePercent(currentSize(), maxSize()));
- if (map) {
- const int limit = map->entryLimit();
- storeAppendPrintf(&e, "Maximum entries: %9d\n", limit);
- if (limit > 0) {
- const int entryCount = map->entryCount();
- storeAppendPrintf(&e, "Current entries: %9d %.2f%%\n",
- entryCount, (100.0 * entryCount / limit));
-
- const unsigned int slotsFree = !freeSlots ? 0 : freeSlots->size();
- if (slotsFree <= static_cast<const unsigned int>(limit)) {
- const int usedSlots = limit - static_cast<const int>(slotsFree);
- storeAppendPrintf(&e, "Used slots: %9d %.2f%%\n",
- usedSlots, (100.0 * usedSlots / limit));
- }
- if (limit < 100) { // XXX: otherwise too expensive to count
- Ipc::ReadWriteLockStats stats;
- map->updateStats(stats);
- stats.dump(e);
- }
+ const int entryLimit = entryLimitActual();
+ const int slotLimit = slotLimitActual();
+ storeAppendPrintf(&e, "Maximum entries: %9d\n", entryLimit);
+ if (map && entryLimit > 0) {
+ const int entryCount = map->entryCount();
+ storeAppendPrintf(&e, "Current entries: %9d %.2f%%\n",
+ entryCount, (100.0 * entryCount / entryLimit));
+ }
+
+ storeAppendPrintf(&e, "Maximum slots: %9d\n", slotLimit);
+ if (map && slotLimit > 0) {
+ const unsigned int slotsFree = !freeSlots ? 0 : freeSlots->size();
+ if (slotsFree <= static_cast<const unsigned int>(slotLimit)) {
+ const int usedSlots = slotLimit - static_cast<const int>(slotsFree);
+ storeAppendPrintf(&e, "Used slots: %9d %.2f%%\n",
+ usedSlots, (100.0 * usedSlots / slotLimit));
+ }
+ if (slotLimit < 100) { // XXX: otherwise too expensive to count
+ Ipc::ReadWriteLockStats stats;
+ map->updateStats(stats);
+ stats.dump(e);
}
}
}
-const char *
-Rock::SwapDir::inodeMapPath() const {
- static String inodesPath;
- inodesPath = path;
- inodesPath.append("_inodes");
- return inodesPath.termedBuf();
+SBuf
+Rock::SwapDir::inodeMapPath() const
+{
+ return Ipc::Mem::Segment::Name(SBuf(path), "map");
}
const char *
-Rock::SwapDir::freeSlotsPath() const {
+Rock::SwapDir::freeSlotsPath() const
+{
static String spacesPath;
spacesPath = path;
spacesPath.append("_spaces");
return spacesPath.termedBuf();
}
+bool
+Rock::SwapDir::hasReadableEntry(const StoreEntry &e) const
+{
+ return map->hasReadableEntry(reinterpret_cast<const cache_key*>(e.key));
+}
+
namespace Rock
{
-RunnerRegistrationEntry(rrAfterConfig, SwapDirRr);
+RunnerRegistrationEntry(SwapDirRr);
}
-void Rock::SwapDirRr::create(const RunnerRegistry &)
+void Rock::SwapDirRr::create()
{
Must(mapOwners.empty() && freeSlotsOwners.empty());
for (int i = 0; i < Config.cacheSwap.n_configured; ++i) {
if (const Rock::SwapDir *const sd = dynamic_cast<Rock::SwapDir *>(INDEXSD(i))) {
- const int64_t capacity = sd->entryLimitAllowed();
+ const int64_t capacity = sd->slotLimitActual();
SwapDir::DirMap::Owner *const mapOwner =
SwapDir::DirMap::Init(sd->inodeMapPath(), capacity);
// TODO: somehow remove pool id and counters from PageStack?
Ipc::Mem::Owner<Ipc::Mem::PageStack> *const freeSlotsOwner =
shm_new(Ipc::Mem::PageStack)(sd->freeSlotsPath(),
- i+1, capacity,
- sizeof(DbCellHeader));
+ Ipc::Mem::PageStack::IdForSwapDirSpace(i),
+ capacity,
+ 0);
freeSlotsOwners.push_back(freeSlotsOwner);
// TODO: add method to initialize PageStack with no free pages
delete freeSlotsOwners[i];
}
}
+
projects / thirdparty / squid.git / blobdiff