mirror of
https://github.com/facebook/sapling.git
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d7fa579a9c
Summary: Pass a valid ObjectFetchContext down into certain untracked requests. Reviewed By: chadaustin Differential Revision: D20243575 fbshipit-source-id: e7112c3bab1265803a26130c4d72905c25f2e729
469 lines
16 KiB
C++
469 lines
16 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#include "EdenDispatcher.h"
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#include <folly/Format.h>
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#include <folly/logging/xlog.h>
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#include <gflags/gflags.h>
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#include <cstring>
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#include <shared_mutex>
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#include "eden/fs/fuse/DirList.h"
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#include "eden/fs/fuse/RequestData.h"
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#include "eden/fs/inodes/EdenMount.h"
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#include "eden/fs/inodes/FileInode.h"
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#include "eden/fs/inodes/InodeMap.h"
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#include "eden/fs/inodes/Overlay.h"
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#include "eden/fs/inodes/TreeInode.h"
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#include "eden/fs/utils/SystemError.h"
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using namespace folly;
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using std::string;
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using std::vector;
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DEFINE_int32(
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inode_reserve,
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1000000,
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"pre-size inode hash table for this many entries");
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namespace facebook {
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namespace eden {
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EdenDispatcher::EdenDispatcher(EdenMount* mount)
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: Dispatcher(mount->getStats()),
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mount_(mount),
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inodeMap_(mount_->getInodeMap()) {}
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namespace {
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/** Compute a fuse_entry_out */
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fuse_entry_out computeEntryParam(const Dispatcher::Attr& attr) {
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DCHECK(attr.st.st_ino) << "We should never return a 0 inode to FUSE";
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fuse_entry_out entry = {};
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entry.nodeid = attr.st.st_ino;
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entry.generation = 0;
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auto fuse_attr = attr.asFuseAttr();
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entry.attr = fuse_attr.attr;
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entry.attr_valid = fuse_attr.attr_valid;
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entry.attr_valid_nsec = fuse_attr.attr_valid_nsec;
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entry.entry_valid = fuse_attr.attr_valid;
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entry.entry_valid_nsec = fuse_attr.attr_valid_nsec;
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return entry;
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}
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constexpr int64_t kBrokenInodeCacheSeconds = 5;
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Dispatcher::Attr attrForInodeWithCorruptOverlay(InodeNumber ino) noexcept {
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struct stat st = {};
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st.st_ino = ino.get();
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st.st_mode = S_IFREG;
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return Dispatcher::Attr{st, kBrokenInodeCacheSeconds};
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}
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} // namespace
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folly::Future<Dispatcher::Attr> EdenDispatcher::getattr(InodeNumber ino) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "getattr({})", ino);
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return inodeMap_->lookupInode(ino).thenValue(
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[](const InodePtr& inode) { return inode->getattr(); });
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}
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folly::Future<uint64_t> EdenDispatcher::opendir(InodeNumber ino, int flags) {
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FB_LOGF(
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mount_->getStraceLogger(), DBG7, "opendir({}, flags={:x})", ino, flags);
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#ifdef FUSE_NO_OPENDIR_SUPPORT
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if (getConnInfo().flags & FUSE_NO_OPENDIR_SUPPORT) {
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// If the kernel understands FUSE_NO_OPENDIR_SUPPORT, then returning ENOSYS
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// means that no further opendir() nor releasedir() calls will make it into
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// Eden.
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folly::throwSystemErrorExplicit(
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ENOSYS, "Eden opendir() calls are stateless and not required");
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}
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#endif
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return 0;
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}
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folly::Future<folly::Unit> EdenDispatcher::releasedir(
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InodeNumber ino,
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uint64_t fh) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "releasedir({}, {})", ino, fh);
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return folly::unit;
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}
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folly::Future<fuse_entry_out> EdenDispatcher::lookup(
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InodeNumber parent,
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PathComponentPiece namepiece) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "lookup({}, {})", parent, namepiece);
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return inodeMap_->lookupTreeInode(parent)
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.thenValue([name = PathComponent(namepiece)](const TreeInodePtr& tree) {
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return tree->getOrLoadChild(name);
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})
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.thenValue([](const InodePtr& inode) {
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return folly::makeFutureWith([&]() { return inode->getattr(); })
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.thenTry([inode](folly::Try<Dispatcher::Attr> maybeAttr) {
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if (maybeAttr.hasValue()) {
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inode->incFuseRefcount();
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return computeEntryParam(maybeAttr.value());
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} else {
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// The most common case for getattr() failing is if this file is
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// materialized but the data for it in the overlay is missing
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// or corrupt. This can happen after a hard reboot where the
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// overlay data was not synced to disk first.
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//
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// We intentionally want to return a result here rather than
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// failing; otherwise we can't return the inode number to the
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// kernel at all. This blocks other operations on the file,
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// like FUSE_UNLINK. By successfully returning from the
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// lookup we allow clients to remove this corrupt file with an
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// unlink operation. (Even though FUSE_UNLINK does not require
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// the child inode number, the kernel does not appear to send a
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// FUSE_UNLINK request to us if it could not get the child inode
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// number first.)
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XLOG(WARN) << "error getting attributes for inode "
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<< inode->getNodeId() << " (" << inode->getLogPath()
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<< "): " << maybeAttr.exception().what();
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inode->incFuseRefcount();
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return computeEntryParam(
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attrForInodeWithCorruptOverlay(inode->getNodeId()));
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}
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});
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})
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.thenError(
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folly::tag_t<std::system_error>{}, [](const std::system_error& err) {
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// Translate ENOENT into a successful response with an
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// inode number of 0 and a large entry_valid time, to let the kernel
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// cache this negative lookup result.
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if (isEnoent(err)) {
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fuse_entry_out entry = {};
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entry.attr_valid =
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std::numeric_limits<decltype(entry.attr_valid)>::max();
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entry.entry_valid =
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std::numeric_limits<decltype(entry.entry_valid)>::max();
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return entry;
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}
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throw err;
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});
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}
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folly::Future<Dispatcher::Attr> EdenDispatcher::setattr(
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InodeNumber ino,
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const fuse_setattr_in& attr) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "setattr({})", ino);
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return inodeMap_->lookupInode(ino).thenValue(
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[attr](const InodePtr& inode) { return inode->setattr(attr); });
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}
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void EdenDispatcher::forget(InodeNumber ino, unsigned long nlookup) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "forget({}, {})", ino, nlookup);
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inodeMap_->decFuseRefcount(ino, nlookup);
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}
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folly::Future<uint64_t> EdenDispatcher::open(InodeNumber ino, int flags) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "open({}, flags={:x})", ino, flags);
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#ifdef FUSE_NO_OPEN_SUPPORT
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if (getConnInfo().flags & FUSE_NO_OPEN_SUPPORT) {
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// If the kernel understands FUSE_NO_OPEN_SUPPORT, then returning ENOSYS
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// means that no further open() nor release() calls will make it into Eden.
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folly::throwSystemErrorExplicit(
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ENOSYS, "Eden open() calls are stateless and not required");
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}
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#endif
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return 0;
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}
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folly::Future<fuse_entry_out> EdenDispatcher::create(
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InodeNumber parent,
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PathComponentPiece name,
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mode_t mode,
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int flags) {
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FB_LOGF(
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mount_->getStraceLogger(),
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DBG7,
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"create({}, {}, {:#x}, {:#x})",
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parent,
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name,
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mode,
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flags);
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// force 'mode' to be regular file, in which case rdev arg to mknod is ignored
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// (and thus can be zero)
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mode = S_IFREG | (07777 & mode);
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return inodeMap_->lookupTreeInode(parent).thenValue(
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[=](const TreeInodePtr& inode) {
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auto childName = PathComponent{name};
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auto child = inode->mknod(childName, mode, 0);
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return child->getattr().thenValue(
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[child](Dispatcher::Attr attr) -> fuse_entry_out {
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child->incFuseRefcount();
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return computeEntryParam(attr);
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});
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});
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}
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folly::Future<BufVec>
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EdenDispatcher::read(InodeNumber ino, size_t size, off_t off) {
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FB_LOGF(
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mount_->getStraceLogger(),
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DBG7,
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"read({}, off={}, len={})",
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ino,
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off,
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size);
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return inodeMap_->lookupFileInode(ino).thenValue(
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[size, off](FileInodePtr&& inode) { return inode->read(size, off); });
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}
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folly::Future<size_t>
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EdenDispatcher::write(InodeNumber ino, folly::StringPiece data, off_t off) {
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FB_LOGF(
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mount_->getStraceLogger(),
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DBG7,
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"write({}, off={}, len={})",
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ino,
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off,
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data.size());
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return inodeMap_->lookupFileInode(ino).thenValue(
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[copy = data.str(), off](FileInodePtr&& inode) {
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return inode->write(copy, off);
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});
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}
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Future<Unit> EdenDispatcher::flush(
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InodeNumber /* ino */,
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uint64_t /* lock_owner */) {
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// Return ENOSYS from flush.
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// This will cause the kernel to stop sending future flush() calls.
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return makeFuture<Unit>(makeSystemErrorExplicit(ENOSYS, "flush"));
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}
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folly::Future<folly::Unit> EdenDispatcher::fsync(
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InodeNumber ino,
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bool datasync) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "fsync({})", ino);
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return inodeMap_->lookupFileInode(ino).thenValue(
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[datasync](FileInodePtr inode) { return inode->fsync(datasync); });
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}
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Future<Unit> EdenDispatcher::fsyncdir(
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InodeNumber /* ino */,
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bool /* datasync */) {
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// Return ENOSYS from fsyncdir. The kernel will stop sending them.
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//
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// In a possible future where the tree structure is stored in a SQLite
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// database, we could handle this request by waiting for SQLite's
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// write-ahead-log to be flushed.
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return makeFuture<Unit>(makeSystemErrorExplicit(ENOSYS, "fsyncdir"));
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}
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folly::Future<std::string> EdenDispatcher::readlink(
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InodeNumber ino,
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bool kernelCachesReadlink) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "readlink({})", ino);
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return inodeMap_->lookupFileInode(ino).thenValue(
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[kernelCachesReadlink](const FileInodePtr& inode) {
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// Only release the symlink blob after it's loaded if we can assume the
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// FUSE will cache the result in the kernel's page cache.
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return inode->readlink(
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ObjectFetchContext::getNullContext(),
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kernelCachesReadlink ? CacheHint::NotNeededAgain
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: CacheHint::LikelyNeededAgain);
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});
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}
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folly::Future<DirList> EdenDispatcher::readdir(
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InodeNumber ino,
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DirList&& dirList,
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off_t offset,
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uint64_t /*fh*/) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "readdir({}, {})", ino, offset);
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return inodeMap_->lookupTreeInode(ino).thenValue(
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[dirList = std::move(dirList), offset](TreeInodePtr inode) mutable {
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return inode->readdir(std::move(dirList), offset);
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});
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}
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folly::Future<fuse_entry_out> EdenDispatcher::mknod(
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InodeNumber parent,
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PathComponentPiece name,
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mode_t mode,
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dev_t rdev) {
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FB_LOGF(
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mount_->getStraceLogger(),
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DBG7,
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"mknod({}, {}, {:#x}, {:#x})",
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parent,
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name,
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mode,
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rdev);
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return inodeMap_->lookupTreeInode(parent).thenValue(
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[childName = PathComponent{name}, mode, rdev](const TreeInodePtr& inode) {
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auto child = inode->mknod(childName, mode, rdev);
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return child->getattr().thenValue(
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[child](Dispatcher::Attr attr) -> fuse_entry_out {
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child->incFuseRefcount();
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return computeEntryParam(attr);
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});
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});
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}
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folly::Future<fuse_entry_out> EdenDispatcher::mkdir(
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InodeNumber parent,
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PathComponentPiece name,
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mode_t mode) {
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FB_LOGF(
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mount_->getStraceLogger(),
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DBG7,
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"mkdir({}, {}, {:#x})",
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parent,
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name,
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mode);
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return inodeMap_->lookupTreeInode(parent).thenValue(
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[childName = PathComponent{name}, mode](const TreeInodePtr& inode) {
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auto child = inode->mkdir(childName, mode);
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return child->getattr().thenValue([child](Dispatcher::Attr attr) {
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child->incFuseRefcount();
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return computeEntryParam(attr);
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});
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});
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}
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folly::Future<folly::Unit> EdenDispatcher::unlink(
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InodeNumber parent,
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PathComponentPiece name) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "unlink({}, {})", parent, name);
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return inodeMap_->lookupTreeInode(parent).thenValue(
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[childName = PathComponent{name}](const TreeInodePtr& inode) {
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return inode->unlink(childName);
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});
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}
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folly::Future<folly::Unit> EdenDispatcher::rmdir(
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InodeNumber parent,
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PathComponentPiece name) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "rmdir({}, {})", parent, name);
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return inodeMap_->lookupTreeInode(parent).thenValue(
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[childName = PathComponent{name}](const TreeInodePtr& inode) {
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return inode->rmdir(childName);
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});
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}
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folly::Future<fuse_entry_out> EdenDispatcher::symlink(
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InodeNumber parent,
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PathComponentPiece name,
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StringPiece link) {
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FB_LOGF(
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mount_->getStraceLogger(), DBG7, "rmdir({}, {}, {})", parent, name, link);
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return inodeMap_->lookupTreeInode(parent).thenValue(
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[linkContents = link.str(),
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childName = PathComponent{name}](const TreeInodePtr& inode) {
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auto symlinkInode = inode->symlink(childName, linkContents);
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symlinkInode->incFuseRefcount();
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return symlinkInode->getattr().thenValue(
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[symlinkInode](Attr&& attr) { return computeEntryParam(attr); });
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});
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}
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folly::Future<folly::Unit> EdenDispatcher::rename(
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InodeNumber parent,
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PathComponentPiece namePiece,
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InodeNumber newParent,
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PathComponentPiece newNamePiece) {
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FB_LOGF(
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mount_->getStraceLogger(),
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DBG7,
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"rename({}, {}, {}, {})",
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parent,
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namePiece,
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newParent,
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newNamePiece);
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// Start looking up both parents
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auto parentFuture = inodeMap_->lookupTreeInode(parent);
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auto newParentFuture = inodeMap_->lookupTreeInode(newParent);
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// Do the rename once we have looked up both parents.
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return std::move(parentFuture)
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.thenValue([npFuture = std::move(newParentFuture),
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name = PathComponent{namePiece},
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newName = PathComponent{newNamePiece}](
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const TreeInodePtr& parent) mutable {
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return std::move(npFuture).thenValue(
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[parent, name, newName](const TreeInodePtr& newParent) {
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return parent->rename(name, newParent, newName);
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});
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});
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}
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folly::Future<fuse_entry_out> EdenDispatcher::link(
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InodeNumber ino,
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InodeNumber newParent,
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PathComponentPiece newName) {
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FB_LOGF(
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mount_->getStraceLogger(),
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DBG7,
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"link({}, {}, {})",
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ino,
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newParent,
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newName);
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validatePathComponentLength(newName);
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// We intentionally do not support hard links.
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// These generally cannot be tracked in source control (git or mercurial)
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// and are not portable to non-Unix platforms.
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folly::throwSystemErrorExplicit(
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EPERM, "hard links are not supported in eden mount points");
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}
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Future<string> EdenDispatcher::getxattr(InodeNumber ino, StringPiece name) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "getxattr({}, {})", ino, name);
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return inodeMap_->lookupInode(ino).thenValue(
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[attrName = name.str()](const InodePtr& inode) {
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return inode->getxattr(attrName);
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});
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}
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Future<vector<string>> EdenDispatcher::listxattr(InodeNumber ino) {
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FB_LOGF(mount_->getStraceLogger(), DBG7, "listxattr({})", ino);
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return inodeMap_->lookupInode(ino).thenValue(
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[](const InodePtr& inode) { return inode->listxattr(); });
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}
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folly::Future<struct fuse_kstatfs> EdenDispatcher::statfs(InodeNumber /*ino*/) {
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struct fuse_kstatfs info = {};
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// Pass through the overlay free space stats; this gives a more reasonable
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// estimation of available storage space than the zeroes that we'd report
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// otherwise. This is important because eg: Finder on macOS inspects disk
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// space prior to initiating a copy and will refuse to start a copy if
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// the disk appears to be full.
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auto overlayStats = mount_->getOverlay()->statFs();
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info.blocks = overlayStats.f_blocks;
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info.bfree = overlayStats.f_bfree;
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info.bavail = overlayStats.f_bavail;
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info.files = overlayStats.f_files;
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info.ffree = overlayStats.f_ffree;
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// Suggest a large blocksize to software that looks at that kind of thing
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// bsize will be returned to applications that call pathconf() with
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// _PC_REC_MIN_XFER_SIZE
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info.bsize = getConnInfo().max_readahead;
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// The fragment size is returned as the _PC_REC_XFER_ALIGN and
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// _PC_ALLOC_SIZE_MIN pathconf() settings.
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// 4096 is commonly used by many filesystem types.
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info.frsize = 4096;
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// Ensure that namelen is set to a non-zero value.
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// The value we return here will be visible to programs that call pathconf()
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// with _PC_NAME_MAX. Returning 0 will confuse programs that try to honor
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// this value.
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info.namelen = 255;
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return info;
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}
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} // namespace eden
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} // namespace facebook
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