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2a6dd2879d
Summary: Eden's on C++17 so fully cross the rubicon! Reviewed By: strager Differential Revision: D10498200 fbshipit-source-id: 4e2af5a8d5cef9a106e8c05e6f93ea9e5b8e696e
127 lines
4.1 KiB
C++
127 lines
4.1 KiB
C++
/*
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* Copyright (c) 2004-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#include "eden/fs/inodes/CheckoutContext.h"
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#include <folly/logging/xlog.h>
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#include "eden/fs/inodes/EdenMount.h"
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#include "eden/fs/inodes/InodePtr.h"
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#include "eden/fs/inodes/TreeInode.h"
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using folly::Future;
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using folly::Unit;
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using std::vector;
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namespace facebook {
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namespace eden {
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CheckoutContext::CheckoutContext(
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EdenMount* mount,
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folly::Synchronized<EdenMount::ParentInfo>::LockedPtr&& parentsLock,
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CheckoutMode checkoutMode)
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: checkoutMode_{checkoutMode},
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mount_{mount},
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parentsLock_(std::move(parentsLock)) {}
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CheckoutContext::~CheckoutContext() {}
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void CheckoutContext::start(RenameLock&& renameLock) {
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renameLock_ = std::move(renameLock);
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}
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Future<vector<CheckoutConflict>> CheckoutContext::finish(Hash newSnapshot) {
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// Only update the parents if it is not a dry run.
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if (!isDryRun()) {
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// Update the in-memory snapshot ID
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parentsLock_->parents.setParents(newSnapshot);
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}
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// Release the rename lock.
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// This allows any filesystem unlink() or rename() operations to proceed.
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renameLock_.unlock();
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// If we have a FUSE channel, flush all invalidations we sent to the kernel
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// as part of the checkout operation. This will ensure that other processes
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// will see up-to-date data once we return.
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//
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// We do this after releasing the rename lock since some of the invalidation
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// operations may be blocked waiting on FUSE unlink() and rename() operations
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// complete.
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auto* fuseChannel = mount_->getFuseChannel();
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if (!isDryRun() && fuseChannel) {
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XLOG(DBG4) << "waiting for inode invalidations to complete";
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return fuseChannel->flushInvalidations().thenValue([this](auto&&) {
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XLOG(DBG4) << "finished processing inode invalidations";
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parentsLock_.unlock();
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return std::move(*conflicts_.wlock());
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});
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}
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// Release the parentsLock_.
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// Once this is released other checkout operations may proceed.
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parentsLock_.unlock();
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// Return conflicts_ via a move operation. We don't need them any more, and
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// can give ownership directly to our caller.
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return std::move(*conflicts_.wlock());
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}
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void CheckoutContext::addConflict(ConflictType type, RelativePathPiece path) {
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// Errors should be added using addError()
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CHECK(type != ConflictType::ERROR)
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<< "attempted to add error using addConflict(): " << path;
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CheckoutConflict conflict;
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conflict.path = path.value().str();
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conflict.type = type;
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conflicts_.wlock()->push_back(std::move(conflict));
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}
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void CheckoutContext::addConflict(
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ConflictType type,
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TreeInode* parent,
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PathComponentPiece name) {
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// addConflict() should never be called with an unlinked TreeInode.
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//
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// We are holding the RenameLock for the duration of the checkout operation,
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// and we only operate on TreeInode's that still exist in the file system
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// namespace. Therefore parent->getPath() must always return non-none value
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// here.
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auto parentPath = parent->getPath();
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CHECK(parentPath.has_value());
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addConflict(type, parentPath.value() + name);
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}
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void CheckoutContext::addConflict(ConflictType type, InodeBase* inode) {
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// As above, the inode in question must have a path here.
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auto path = inode->getPath();
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CHECK(path.has_value());
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addConflict(type, path.value());
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}
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void CheckoutContext::addError(
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TreeInode* parent,
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PathComponentPiece name,
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const folly::exception_wrapper& ew) {
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// As above in addConflict(), the parent tree must have a valid path here.
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auto parentPath = parent->getPath();
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CHECK(parentPath.has_value());
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auto path = parentPath.value() + name;
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CheckoutConflict conflict;
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conflict.path = path.value();
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conflict.type = ConflictType::ERROR;
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conflict.message = folly::exceptionStr(ew).toStdString();
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conflicts_.wlock()->push_back(std::move(conflict));
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}
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} // namespace eden
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} // namespace facebook
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