mirror of
https://github.com/matrix-construct/construct
synced 2024-12-27 16:04:15 +01:00
2407 lines
44 KiB
C++
2407 lines
44 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#include <RB_INC_FCNTL_H
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#include <RB_INC_SYS_STAT_H
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#include <RB_INC_SYS_STATFS_H
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#include <RB_INC_SYS_STATVFS_H
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#include <RB_INC_SYS_RESOURCE_H
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#include <boost/filesystem.hpp>
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#ifdef IRCD_USE_AIO
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#include "fs_aio.h"
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#endif
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#ifdef IRCD_USE_IOU
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#include "fs_iou.h"
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#endif
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// TODO: prevents use until io_uring support implemented
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#undef IRCD_USE_IOU
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namespace ircd::fs
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{
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extern conf::item<ulong> rlimit_nofile;
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static void update_rlimit_nofile();
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static void init_dump_info();
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}
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decltype(ircd::fs::log)
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ircd::fs::log
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{
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"fs"
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};
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decltype(ircd::fs::rlimit_nofile)
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ircd::fs::rlimit_nofile
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{
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{
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{ "name", "ircd.fs.rlimit.nofile" },
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{ "default", 65535L },
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{ "persist", false },
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},
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update_rlimit_nofile
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};
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//
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// init::init
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//
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ircd::fs::init::init()
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{
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init_dump_info();
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}
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ircd::fs::init::~init()
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noexcept
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{
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}
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void
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ircd::fs::init_dump_info()
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{
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const bool support_async
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{
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false || iou::system || aio::system
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};
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if(!support_async)
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log::warning
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{
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log, "Support for asynchronous filesystem IO has not been"
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" established. Filesystem IO is degraded to synchronous system calls."
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};
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}
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#if defined(HAVE_SYS_RESOURCE_H) && defined(RLIMIT_NOFILE)
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void
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ircd::fs::update_rlimit_nofile()
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try
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{
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rlimit rlim[2];
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syscall(getrlimit, RLIMIT_NOFILE, &rlim[0]);
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rlim[1] = rlim[0];
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rlim[1].rlim_cur = std::max(rlim[1].rlim_cur, ulong(fs::rlimit_nofile));
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rlim[1].rlim_cur = std::min(rlim[1].rlim_cur, rlim[1].rlim_max);
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if(rlim[0].rlim_cur == rlim[1].rlim_cur)
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return;
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syscall(setrlimit, RLIMIT_NOFILE, &rlim[1]);
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log::info
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{
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log, "Raised resource limit for number of open files from %ld to %ld",
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rlim[0].rlim_cur,
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rlim[1].rlim_cur,
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};
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}
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catch(const std::system_error &e)
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{
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log::warning
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{
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log, "Failed to raise resource limit for number of open files :%s",
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e.what()
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};
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}
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#else
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void
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ircd::fs::init_rlimit_nofile()
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{
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log::dwarning
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{
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log, "Cannot modify resource limit for number of open files."
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};
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}
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#endif
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///////////////////////////////////////////////////////////////////////////////
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//
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// fs/support.h
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//
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decltype(ircd::fs::support::pwritev2)
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ircd::fs::support::pwritev2
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{
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#if defined(HAVE_PWRITEV2)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 6)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::preadv2)
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ircd::fs::support::preadv2
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{
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#if defined(HAVE_PREADV2)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 6)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::sync)
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ircd::fs::support::sync
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{
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#if defined(HAVE_PWRITEV2) && defined(RWF_SYNC)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 7)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::dsync)
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ircd::fs::support::dsync
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{
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#if defined(HAVE_PWRITEV2) && defined(RWF_DSYNC)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 7)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::hipri)
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ircd::fs::support::hipri
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{
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#if defined(HAVE_PWRITEV2) && defined(RWF_HIPRI)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 6)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::nowait)
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ircd::fs::support::nowait
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{
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#if defined(HAVE_PWRITEV2) && defined(RWF_NOWAIT)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 14)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::append)
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ircd::fs::support::append
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{
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#if defined(HAVE_PWRITEV2) && defined(RWF_APPEND)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 16)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::rwh_write_life)
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ircd::fs::support::rwh_write_life
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{
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#if defined(HAVE_FCNTL_H) && defined(F_SET_FILE_RW_HINT)
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info::kernel_version[0] > 4 ||
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(info::kernel_version[0] >= 4 && info::kernel_version[1] >= 13)
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::rwf_write_life)
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ircd::fs::support::rwf_write_life
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{
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#if defined(RWF_WRITE_LIFE_SHIFT)
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false //TODO: XXX
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#else
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false
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#endif
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};
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decltype(ircd::fs::support::aio)
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ircd::fs::support::aio
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{
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#ifdef IRCD_USE_AIO
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true
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#else
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false
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#endif
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};
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void
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ircd::fs::support::dump_info()
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{
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#if defined(IRCD_USE_AIO) || defined(IRCD_USE_IOU)
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const bool support_async {true};
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#else
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const bool support_async {false};
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#endif
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log::info
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{
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log, "Support: async:%b preadv2:%b pwritev2:%b SYNC:%b DSYNC:%b HIPRI:%b NOWAIT:%b APPEND:%b RWH:%b WLH:%b",
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support_async,
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preadv2,
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pwritev2,
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sync,
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dsync,
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hipri,
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nowait,
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append,
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rwh_write_life,
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rwf_write_life,
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};
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#ifdef RB_DEBUG
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const unique_mutable_buffer buf
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{
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PATH_MAX_LEN + 1
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};
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log::debug
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{
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log, "Current working directory: `%s'", cwd(buf)
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};
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#endif
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}
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bool
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ircd::fs::support::fallocate(const string_view &path,
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const write_opts &wopts)
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try
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{
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const fd::opts opts
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{
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std::ios::out
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};
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fs::fd fd
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{
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path, opts
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};
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fs::allocate(fd, info::page_size, wopts);
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return true;
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}
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catch(const std::system_error &e)
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{
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const auto &ec(e.code());
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if(system_category(ec)) switch(ec.value())
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{
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case int(std::errc::invalid_argument):
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case int(std::errc::operation_not_supported):
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return false;
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default:
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break;
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}
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throw;
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}
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bool
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ircd::fs::support::direct_io(const string_view &path)
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try
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{
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fd::opts opts{std::ios::out};
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opts.direct = true;
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fd{path, opts};
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return true;
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}
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catch(const std::system_error &e)
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{
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const auto &ec(e.code());
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if(system_category(ec)) switch(ec.value())
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{
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case int(std::errc::invalid_argument):
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return false;
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default:
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break;
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}
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throw;
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}
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#if defined(HAVE_SYS_RESOURCE_H) && defined(RLIMIT_FSIZE)
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size_t
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ircd::fs::support::rlimit_fsize()
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{
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rlimit rlim;
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syscall(getrlimit, RLIMIT_FSIZE, &rlim);
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return rlim.rlim_cur;
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}
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#else
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size_t
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ircd::fs::support::rlimit_fize()
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{
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return -1;
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}
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#endif
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#if defined(HAVE_SYS_RESOURCE_H) && defined(RLIMIT_NOFILE)
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size_t
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ircd::fs::support::rlimit_nofile()
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{
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rlimit rlim;
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syscall(getrlimit, RLIMIT_NOFILE, &rlim);
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return rlim.rlim_cur;
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}
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#else
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size_t
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ircd::fs::support::rlimit_nofile()
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{
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return -1;
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}
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#endif
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///////////////////////////////////////////////////////////////////////////////
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//
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// fs.h / misc
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//
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bool
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ircd::fs::mkdir(const string_view &path)
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try
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{
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return filesystem::create_directories(_path(path));
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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bool
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ircd::fs::remove(const string_view &path)
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try
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{
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const prof::syscall_usage_warning message
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{
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"fs::remove(%s)", path
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};
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return filesystem::remove(_path(path));
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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bool
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ircd::fs::remove(std::nothrow_t,
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const string_view &path)
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{
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const prof::syscall_usage_warning message
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{
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"fs::remove(%s)", path
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};
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boost::system::error_code ec;
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return filesystem::remove(_path(path), ec);
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}
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bool
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ircd::fs::rename(const string_view &old,
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const string_view &new_)
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try
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{
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const prof::syscall_usage_warning message
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{
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"fs::rename(%s, %s)", old, new_
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};
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filesystem::rename(_path(old), _path(new_));
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return true;
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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bool
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ircd::fs::rename(std::nothrow_t,
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const string_view &old,
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const string_view &new_)
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{
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const prof::syscall_usage_warning message
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{
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"fs::rename(%s, %s)", old, new_
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};
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boost::system::error_code ec;
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filesystem::rename(_path(old), _path(new_), ec);
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return !ec;
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}
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std::vector<std::string>
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ircd::fs::ls_r(const string_view &path)
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try
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{
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const filesystem::recursive_directory_iterator end;
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filesystem::recursive_directory_iterator it
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{
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_path(path)
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};
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std::vector<std::string> ret;
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std::for_each(it, end, [&ret]
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(const auto &ent)
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{
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ret.emplace_back(ent.path().string());
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});
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return ret;
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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std::vector<std::string>
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ircd::fs::ls(const string_view &path)
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try
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{
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static const filesystem::directory_iterator end;
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filesystem::directory_iterator it
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{
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_path(path)
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};
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std::vector<std::string> ret;
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std::for_each(it, end, [&ret]
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(const auto &ent)
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{
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ret.emplace_back(ent.path().string());
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});
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return ret;
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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size_t
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ircd::fs::size(const string_view &path)
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try
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{
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return filesystem::file_size(_path(path));
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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bool
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ircd::fs::is_reg(const string_view &path)
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try
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{
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return filesystem::is_regular_file(_path(path));
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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bool
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ircd::fs::is_dir(const string_view &path)
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try
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{
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return filesystem::is_directory(_path(path));
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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bool
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ircd::fs::exists(const string_view &path)
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try
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{
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return filesystem::exists(_path(path));
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}
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catch(const filesystem::filesystem_error &e)
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{
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throw error{e};
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}
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|
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///////////////////////////////////////////////////////////////////////////////
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//
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// fs/stdin.h
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//
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ircd::string_view
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ircd::fs::stdin::readline(const mutable_buffer &buf)
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try
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{
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boost::asio::posix::stream_descriptor fd
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{
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ios::get(), dup(STDIN_FILENO)
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};
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boost::asio::streambuf sb
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{
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size(buf)
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};
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const auto interruption{[&fd]
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(ctx::ctx *const &interruptor)
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{
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fd.cancel();
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}};
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size_t len; continuation
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{
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continuation::asio_predicate, interruption, [&len, &fd, &sb]
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(auto &yield)
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{
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len = boost::asio::async_read_until(fd, sb, '\n', yield);
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}
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};
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std::istream is{&sb};
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is.get(data(buf), size(buf), '\n');
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return string_view
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{
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data(buf), size_t(is.gcount())
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};
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}
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catch(boost::system::system_error &e)
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{
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throw_system_error(e.code());
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__builtin_unreachable();
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}
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|
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//
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// tty
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//
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ircd::fs::stdin::tty::tty()
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:fd{[]
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{
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thread_local char buf[256];
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syscall(::ttyname_r, STDIN_FILENO, buf, sizeof(buf));
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return fd
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{
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string_view{buf}, std::ios_base::out
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};
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}()}
|
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{
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}
|
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|
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size_t
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ircd::fs::stdin::tty::write(const string_view &buf)
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{
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return syscall(::write, int(*this), buf.data(), buf.size());
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}
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|
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///////////////////////////////////////////////////////////////////////////////
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//
|
|
// fs/select.h
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//
|
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|
|
size_t
|
|
ircd::fs::select(const vector_view<const fd> &fd_)
|
|
{
|
|
using asio::posix::stream_descriptor;
|
|
|
|
static ios::descriptor desc
|
|
{
|
|
"ircd::fs::select"
|
|
};
|
|
|
|
const size_t num(size(fd_));
|
|
std::optional<stream_descriptor> _fd[num];
|
|
const unwind release{[&_fd]
|
|
{
|
|
for(auto &fd : _fd)
|
|
if(fd)
|
|
fd->release();
|
|
}};
|
|
|
|
size_t ret(-1);
|
|
ctx::latch latch(num);
|
|
const auto callback{[&num, &_fd, &latch, &ret]
|
|
(const boost::system::error_code &ec, const auto &fd)
|
|
{
|
|
// The first successful callback is associated with an input fd
|
|
// and its array indice becomes the return value.
|
|
if(!ec && ret == size_t(-1))
|
|
{
|
|
const auto it
|
|
{
|
|
std::find_if(_fd, _fd + num, [&fd]
|
|
(const auto &_fd)
|
|
{
|
|
return _fd && std::addressof(*_fd) == std::addressof(*fd);
|
|
})
|
|
};
|
|
|
|
ret = std::distance(_fd, it);
|
|
assert(ret < num);
|
|
}
|
|
|
|
latch.count_down();
|
|
}};
|
|
|
|
for(size_t i(0); i < num; ++i)
|
|
{
|
|
// Allow a closed descriptor in the vector to be no-op.
|
|
if(!fd_[i])
|
|
{
|
|
latch.count_down();
|
|
continue;
|
|
}
|
|
|
|
_fd[i] =
|
|
{
|
|
ios::get(), int(fd_[i])
|
|
};
|
|
|
|
auto handle
|
|
{
|
|
std::bind(callback, ph::_1, std::cref(_fd[i]))
|
|
};
|
|
|
|
_fd[i]->async_wait(stream_descriptor::wait_read, ios::handle(desc, std::move(handle)));
|
|
}
|
|
|
|
std::exception_ptr eptr; try
|
|
{
|
|
latch.wait();
|
|
assert(ret < num);
|
|
return ret;
|
|
}
|
|
catch(...)
|
|
{
|
|
eptr = std::current_exception();
|
|
const ctx::exception_handler eh;
|
|
const ctx::uninterruptible::nothrow ui;
|
|
for(auto &fd : _fd)
|
|
fd->cancel();
|
|
|
|
latch.wait();
|
|
assert(eptr);
|
|
std::rethrow_exception(eptr);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/sync.h
|
|
//
|
|
|
|
ircd::fs::sync_opts
|
|
const ircd::fs::sync_opts_default;
|
|
|
|
void
|
|
ircd::fs::sync(const fd &fd,
|
|
const off_t &offset,
|
|
const size_t &length,
|
|
const sync_opts &opts)
|
|
{
|
|
return sync(fd, opts);
|
|
}
|
|
|
|
void
|
|
ircd::fs::sync(const fd &fd,
|
|
const sync_opts &opts)
|
|
{
|
|
assert(opts.op == op::SYNC);
|
|
const prof::syscall_usage_warning message
|
|
{
|
|
"fs::sync(fd:%d)", int(fd)
|
|
};
|
|
|
|
#ifdef __linux__
|
|
syscall(::syncfs, fd);
|
|
#else
|
|
syscall(::sync);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
ircd::fs::flush(const fd &fd,
|
|
const off_t &offset,
|
|
const size_t &length,
|
|
const sync_opts &opts)
|
|
{
|
|
return flush(fd, opts);
|
|
}
|
|
|
|
void
|
|
ircd::fs::flush(const fd &fd,
|
|
const sync_opts &opts)
|
|
{
|
|
assert(opts.op == op::SYNC);
|
|
|
|
#ifdef IRCD_USE_IOU
|
|
if(iou::system && opts.aio)
|
|
return iou::fsync(fd, opts);
|
|
#endif
|
|
|
|
#ifdef IRCD_USE_AIO
|
|
if(aio::system && opts.aio)
|
|
{
|
|
if(support::aio_fdsync && !opts.metadata)
|
|
aio::fsync(fd, opts);
|
|
|
|
if(support::aio_fsync && opts.metadata)
|
|
aio::fsync(fd, opts);
|
|
}
|
|
#endif
|
|
|
|
const prof::syscall_usage_warning message
|
|
{
|
|
"fs::flush(fd:%d, {metadata:%b aio:%b:%b})",
|
|
int(fd),
|
|
opts.metadata,
|
|
opts.aio,
|
|
opts.metadata? support::aio_fsync : support::aio_fdsync
|
|
};
|
|
|
|
if(!opts.metadata)
|
|
return void(syscall(::fdatasync, fd));
|
|
|
|
return void(syscall(::fsync, fd));
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/read.h
|
|
//
|
|
|
|
namespace ircd::fs
|
|
{
|
|
static bool fincore(void *const &map, const size_t &map_size, uint8_t *const &vec, const size_t &vec_size);
|
|
}
|
|
|
|
ircd::fs::read_opts
|
|
const ircd::fs::read_opts_default
|
|
{};
|
|
|
|
size_t
|
|
ircd::fs::prefetch(const fd &fd,
|
|
const size_t &count,
|
|
const read_opts &opts)
|
|
{
|
|
#if defined(POSIX_FADV_WILLNEED)
|
|
return advise(fd, POSIX_FADV_WILLNEED, count, opts);
|
|
#else
|
|
return 0UL;
|
|
#endif
|
|
}
|
|
|
|
bool
|
|
ircd::fs::fincore(const fd &fd,
|
|
const size_t &count,
|
|
const read_opts &opts)
|
|
{
|
|
assert(opts.offset % info::page_size == 0);
|
|
const size_t &map_size
|
|
{
|
|
count?: size(fd)
|
|
};
|
|
|
|
void *const &map
|
|
{
|
|
::mmap(nullptr, map_size, PROT_NONE, MAP_NONBLOCK | MAP_SHARED, int(fd), opts.offset)
|
|
};
|
|
|
|
if(unlikely(map == MAP_FAILED))
|
|
throw_system_error(errno);
|
|
|
|
const custom_ptr<void> map_ptr
|
|
{
|
|
map, [&map_size](void *const &map)
|
|
{
|
|
syscall(::munmap, map, map_size);
|
|
}
|
|
};
|
|
|
|
using word_t = unsigned long long;
|
|
thread_local std::array<word_t, 64> tls_vec;
|
|
|
|
const size_t vec_size
|
|
{
|
|
std::max(((map_size + info::page_size - 1) / info::page_size) / sizeof(word_t), 1UL)
|
|
};
|
|
|
|
assert(vec_size > 0 && vec_size < map_size);
|
|
const auto dynamic_vec_size
|
|
{
|
|
vec_size > tls_vec.size()? vec_size : 0UL
|
|
};
|
|
|
|
std::vector<word_t> dynamic_vec(dynamic_vec_size);
|
|
auto *const vec(dynamic_vec_size? dynamic_vec.data(): tls_vec.data());
|
|
return fincore(map, map_size, reinterpret_cast<uint8_t *>(vec), vec_size);
|
|
}
|
|
|
|
bool
|
|
ircd::fs::fincore(void *const &map,
|
|
const size_t &map_size,
|
|
uint8_t *const &vec,
|
|
const size_t &vec_size)
|
|
{
|
|
syscall(::mincore, map, map_size, vec);
|
|
return std::find(vec, vec + vec_size, 0UL) == vec + vec_size;
|
|
}
|
|
|
|
std::string
|
|
ircd::fs::read(const fd &fd,
|
|
const read_opts &opts)
|
|
{
|
|
return string(size(fd), [&fd, &opts]
|
|
(const mutable_buffer &buf)
|
|
{
|
|
return read(fd, buf, opts);
|
|
});
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::fs::read(const fd &fd,
|
|
const mutable_buffer &buf,
|
|
const read_opts &opts)
|
|
{
|
|
const mutable_buffers bufs
|
|
{
|
|
&buf, 1
|
|
};
|
|
|
|
return mutable_buffer
|
|
{
|
|
data(buf), read(fd, bufs, opts)
|
|
};
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::read(const vector_view<read_op> &op)
|
|
{
|
|
// Use IOV_MAX as a sanity value for number of operations here
|
|
if(unlikely(op.size() > info::iov_max))
|
|
throw error
|
|
{
|
|
make_error_code(std::errc::invalid_argument),
|
|
"Read operation count:%zu exceeds max:%zu",
|
|
op.size(),
|
|
info::iov_max,
|
|
};
|
|
|
|
bool aio {true}, all {false};
|
|
for(size_t i(0); i < op.size(); ++i)
|
|
{
|
|
assert(op[i].opts);
|
|
assert(op[i].opts->aio);
|
|
|
|
// If any op isn't tolerant of less bytes actually read than they
|
|
// requested, they require us to perform the unix read loop, and
|
|
// that ruins things for everybody!
|
|
assert(!op[i].opts->all);
|
|
//all |= op[i].opts->all;
|
|
|
|
// If any op doesn't want AIO we have to fallback on sequential
|
|
// blocking reads for all ops.
|
|
assert(op[i].opts->aio);
|
|
//aio &= op[i].opts->aio;
|
|
|
|
// EINVAL for exceeding this system's IOV_MAX
|
|
if(unlikely(op[i].bufs.size() > info::iov_max))
|
|
throw error
|
|
{
|
|
make_error_code(std::errc::invalid_argument),
|
|
"op[%zu] :buffer count of %zu exceeds IOV_MAX of %zu",
|
|
i,
|
|
op[i].bufs.size(),
|
|
info::iov_max,
|
|
};
|
|
}
|
|
|
|
#ifdef IRCD_USE_AIO
|
|
if(likely(aio::system && aio && !all))
|
|
return aio::read(op);
|
|
#endif
|
|
|
|
// Fallback to sequential read operations
|
|
size_t ret(0);
|
|
for(size_t i(0); i < op.size(); ++i) try
|
|
{
|
|
assert(op[i].fd);
|
|
assert(op[i].opts);
|
|
op[i].ret = read(*op[i].fd, op[i].bufs, *op[i].opts);
|
|
ret += op[i].ret;
|
|
}
|
|
catch(const std::system_error &)
|
|
{
|
|
op[i].eptr = std::current_exception();
|
|
op[i].ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
namespace ircd::fs
|
|
{
|
|
static int flags(const read_opts &opts);
|
|
static size_t _read_preadv2(const fd &, const const_iovec_view &, const read_opts &);
|
|
static size_t _read_preadv(const fd &, const const_iovec_view &, const read_opts &);
|
|
static size_t read(const fd &, const const_iovec_view &, const read_opts &);
|
|
}
|
|
|
|
/// Read from file descriptor fd into buffers. The number of bytes read into
|
|
/// the buffers is returned. By default (via read_opts.all) this call will
|
|
/// loop internally until the buffers are full or EOF. To allow for a partial
|
|
/// read(), disable read_opts.all. Note that to maintain alignments (i.e when
|
|
/// direct-io or for special files read_opts.all must be false). By default
|
|
/// (via read_opts.interruptible) this call can throw if the syscall was
|
|
/// interrupted before reading any bytes.
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wstack-usage="
|
|
size_t
|
|
__attribute__((stack_protect))
|
|
ircd::fs::read(const fd &fd,
|
|
const mutable_buffers &bufs,
|
|
const read_opts &opts_)
|
|
{
|
|
if(unlikely(bufs.size() > info::iov_max))
|
|
throw error
|
|
{
|
|
make_error_code(std::errc::invalid_argument),
|
|
"Buffer count of %zu exceeds IOV_MAX of %zu",
|
|
bufs.size(),
|
|
info::iov_max
|
|
};
|
|
|
|
size_t ret(0);
|
|
read_opts opts(opts_);
|
|
assert(bufs.size() <= info::iov_max);
|
|
struct ::iovec iovbuf[bufs.size()]; do
|
|
{
|
|
assert(opts.offset >= opts_.offset);
|
|
const size_t off(opts.offset - opts_.offset);
|
|
assert(off <= buffers::size(bufs));
|
|
assert(ret <= buffers::size(bufs));
|
|
const auto iov
|
|
{
|
|
make_iov({iovbuf, bufs.size()}, bufs, ret)
|
|
};
|
|
|
|
const size_t last
|
|
{
|
|
read(fd, iov, opts)
|
|
};
|
|
|
|
if(!opts_.blocking && !last)
|
|
break;
|
|
|
|
ret += last;
|
|
if(!opts_.all)
|
|
break;
|
|
|
|
if(off >= ret)
|
|
break;
|
|
|
|
opts.offset = opts_.offset + ret;
|
|
}
|
|
while(ret < buffers::size(bufs));
|
|
assert(opts.offset >= opts_.offset);
|
|
assert(ret <= buffers::size(bufs));
|
|
return ret;
|
|
}
|
|
#pragma GCC diagnostic pop
|
|
|
|
/// Lowest-level'ish read() call. This call only conducts a single operation
|
|
/// (no looping) and can return a partial read(). It does have branches
|
|
/// for various read_opts. The arguments involve `struct ::iovec` which
|
|
/// we do not expose to the ircd.h API; thus this function is internal to
|
|
/// ircd::fs. There is no reason to use this function in lieu of the public
|
|
/// fs::read() suite.
|
|
size_t
|
|
ircd::fs::read(const fd &fd,
|
|
const const_iovec_view &iov,
|
|
const read_opts &opts)
|
|
{
|
|
assert(opts.op == op::READ);
|
|
|
|
#ifdef IRCD_USE_IOU
|
|
if(likely(iou::system && opts.aio))
|
|
return iou::read(fd, iov, opts);
|
|
#endif
|
|
|
|
#ifdef IRCD_USE_AIO
|
|
if(likely(aio::system && opts.aio))
|
|
return aio::read(fd, iov, opts);
|
|
#endif
|
|
|
|
#ifdef HAVE_PREADV2
|
|
return support::preadv2?
|
|
_read_preadv2(fd, iov, opts):
|
|
_read_preadv(fd, iov, opts);
|
|
#else
|
|
return _read_preadv(fd, iov, opts);
|
|
#endif
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::_read_preadv(const fd &fd,
|
|
const const_iovec_view &iov,
|
|
const read_opts &opts)
|
|
{
|
|
ssize_t ret; do
|
|
{
|
|
ret = ::preadv(int(fd), iov.data(), iov.size(), opts.offset);
|
|
}
|
|
while(!opts.interruptible && unlikely(ret == -1 && errno == EINTR));
|
|
|
|
static_assert(EAGAIN == EWOULDBLOCK);
|
|
if(unlikely(!opts.blocking && ret == -1 && errno == EAGAIN))
|
|
return 0UL;
|
|
|
|
if(unlikely(ret == -1))
|
|
throw std::system_error
|
|
{
|
|
errno, std::system_category()
|
|
};
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef HAVE_PREADV2
|
|
size_t
|
|
ircd::fs::_read_preadv2(const fd &fd,
|
|
const const_iovec_view &iov,
|
|
const read_opts &opts)
|
|
{
|
|
const auto &flags_
|
|
{
|
|
flags(opts)
|
|
};
|
|
|
|
ssize_t ret; do
|
|
{
|
|
ret = ::preadv2(int(fd), iov.data(), iov.size(), opts.offset, flags_);
|
|
}
|
|
while(!opts.interruptible && unlikely(ret == -1 && errno == EINTR));
|
|
|
|
static_assert(EAGAIN == EWOULDBLOCK);
|
|
if(!opts.blocking && ret == -1 && errno == EAGAIN)
|
|
return 0UL;
|
|
|
|
if(unlikely(ret == -1))
|
|
throw std::system_error
|
|
{
|
|
errno, std::system_category()
|
|
};
|
|
|
|
return ret;
|
|
}
|
|
#endif HAVE_PREADV2
|
|
|
|
int
|
|
ircd::fs::flags(const read_opts &opts)
|
|
{
|
|
int ret{0};
|
|
|
|
#if defined(RWF_HIPRI)
|
|
if(support::hipri && reqprio(opts.priority) == reqprio(opts::highest_priority))
|
|
ret |= RWF_HIPRI;
|
|
#endif
|
|
|
|
#if defined(RWF_NOWAIT)
|
|
if(support::nowait && !opts.blocking)
|
|
ret |= RWF_NOWAIT;
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/write.h
|
|
//
|
|
|
|
ircd::fs::write_opts
|
|
const ircd::fs::write_opts_default
|
|
{};
|
|
|
|
void
|
|
ircd::fs::allocate(const fd &fd,
|
|
const size_t &size,
|
|
const write_opts &opts)
|
|
{
|
|
assert(opts.op == op::WRITE);
|
|
|
|
int mode{0};
|
|
|
|
#ifdef FALLOC_FL_KEEP_SIZE
|
|
mode |= opts.keep_size? FALLOC_FL_KEEP_SIZE : 0;
|
|
#else
|
|
if(opts.keep_size)
|
|
throw_system_error(std::errc::invalid_argument);
|
|
#endif
|
|
|
|
#ifdef FALLOC_FL_PUNCH_HOLE
|
|
mode |= opts.punch_hole? FALLOC_FL_PUNCH_HOLE : 0;
|
|
#else
|
|
if(opts.punch_hole)
|
|
throw_system_error(std::errc::invalid_argument);
|
|
#endif
|
|
|
|
syscall(::fallocate, fd, mode, opts.offset, size);
|
|
}
|
|
|
|
void
|
|
ircd::fs::truncate(const string_view &path,
|
|
const size_t &size,
|
|
const write_opts &opts)
|
|
{
|
|
const fd fd
|
|
{
|
|
path, std::ios::out | std::ios::trunc
|
|
};
|
|
|
|
return truncate(fd, size, opts);
|
|
}
|
|
|
|
void
|
|
ircd::fs::truncate(const fd &fd,
|
|
const size_t &size,
|
|
const write_opts &opts)
|
|
{
|
|
assert(opts.op == op::WRITE);
|
|
syscall(::ftruncate, fd, size);
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::fs::overwrite(const string_view &path,
|
|
const const_buffer &buf,
|
|
const write_opts &opts)
|
|
{
|
|
const const_buffers bufs
|
|
{
|
|
&buf, 1
|
|
};
|
|
|
|
return const_buffer
|
|
{
|
|
data(buf), overwrite(path, bufs, opts)
|
|
};
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::fs::overwrite(const fd &fd,
|
|
const const_buffer &buf,
|
|
const write_opts &opts)
|
|
{
|
|
const const_buffers bufs
|
|
{
|
|
&buf, 1
|
|
};
|
|
|
|
return const_buffer
|
|
{
|
|
data(buf), overwrite(fd, bufs, opts)
|
|
};
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::overwrite(const string_view &path,
|
|
const const_buffers &bufs,
|
|
const write_opts &opts)
|
|
{
|
|
const fd fd
|
|
{
|
|
path, std::ios::out | std::ios::trunc
|
|
};
|
|
|
|
return overwrite(fd, bufs, opts);
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::overwrite(const fd &fd,
|
|
const const_buffers &bufs,
|
|
const write_opts &opts)
|
|
{
|
|
return write(fd, bufs, opts);
|
|
}
|
|
|
|
//
|
|
// append
|
|
//
|
|
|
|
ircd::const_buffer
|
|
ircd::fs::append(const string_view &path,
|
|
const const_buffer &buf,
|
|
const write_opts &opts)
|
|
{
|
|
const const_buffers bufs
|
|
{
|
|
&buf, 1
|
|
};
|
|
|
|
return const_buffer
|
|
{
|
|
data(buf), append(path, bufs, opts)
|
|
};
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::fs::append(const fd &fd,
|
|
const const_buffer &buf,
|
|
const write_opts &opts)
|
|
{
|
|
const const_buffers bufs
|
|
{
|
|
&buf, 1
|
|
};
|
|
|
|
return const_buffer
|
|
{
|
|
data(buf), append(fd, bufs, opts)
|
|
};
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::append(const string_view &path,
|
|
const const_buffers &bufs,
|
|
const write_opts &opts)
|
|
{
|
|
const fd fd
|
|
{
|
|
path, std::ios::out | std::ios::app
|
|
};
|
|
|
|
return append(fd, bufs, opts);
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::append(const fd &fd,
|
|
const const_buffers &bufs,
|
|
const write_opts &opts_)
|
|
{
|
|
auto opts(opts_);
|
|
if(support::pwritev2 && support::append)
|
|
opts.offset = -1;
|
|
else if(!opts.offset || opts.offset == -1)
|
|
opts.offset = syscall(::lseek, fd, 0, SEEK_END);
|
|
|
|
return write(fd, bufs, opts);
|
|
}
|
|
|
|
//
|
|
// write
|
|
//
|
|
|
|
ircd::const_buffer
|
|
ircd::fs::write(const string_view &path,
|
|
const const_buffer &buf,
|
|
const write_opts &opts)
|
|
{
|
|
const const_buffers bufs
|
|
{
|
|
&buf, 1
|
|
};
|
|
|
|
return const_buffer
|
|
{
|
|
data(buf), write(path, bufs, opts)
|
|
};
|
|
}
|
|
|
|
ircd::const_buffer
|
|
ircd::fs::write(const fd &fd,
|
|
const const_buffer &buf,
|
|
const write_opts &opts)
|
|
{
|
|
const const_buffers bufs
|
|
{
|
|
&buf, 1
|
|
};
|
|
|
|
return const_buffer
|
|
{
|
|
data(buf), write(fd, bufs, opts)
|
|
};
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::write(const string_view &path,
|
|
const const_buffers &bufs,
|
|
const write_opts &opts)
|
|
{
|
|
const fd fd
|
|
{
|
|
path, std::ios::out
|
|
};
|
|
|
|
return write(fd, bufs, opts);
|
|
}
|
|
|
|
namespace ircd::fs
|
|
{
|
|
static int flags(const write_opts &opts);
|
|
static size_t _write_pwritev2(const fd &, const const_iovec_view &, const write_opts &);
|
|
static size_t _write_pwritev(const fd &, const const_iovec_view &, const write_opts &);
|
|
static size_t write(const fd &, const const_iovec_view &, const write_opts &);
|
|
}
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wstack-usage="
|
|
size_t
|
|
__attribute__((stack_protect))
|
|
ircd::fs::write(const fd &fd,
|
|
const const_buffers &bufs,
|
|
const write_opts &opts_)
|
|
{
|
|
if(unlikely(bufs.size() > info::iov_max))
|
|
throw error
|
|
{
|
|
make_error_code(std::errc::invalid_argument),
|
|
"Buffer count of %zu exceeds IOV_MAX of %zu",
|
|
bufs.size(),
|
|
info::iov_max
|
|
};
|
|
|
|
size_t off(0);
|
|
write_opts opts(opts_);
|
|
assert(bufs.size() <= info::iov_max);
|
|
struct ::iovec iovbuf[bufs.size()]; do
|
|
{
|
|
const auto iov
|
|
{
|
|
make_iov({iovbuf, bufs.size()}, bufs, off)
|
|
};
|
|
|
|
const size_t last
|
|
{
|
|
write(fd, iov, opts)
|
|
};
|
|
|
|
opts.offset += last;
|
|
assert(opts.offset >= opts_.offset);
|
|
off = opts.offset - opts_.offset;
|
|
if(!opts.blocking && !last)
|
|
break;
|
|
}
|
|
while(opts.all && opts_.offset >= 0 && off < buffers::size(bufs));
|
|
assert(opts.offset >= opts_.offset);
|
|
assert(ssize_t(off) == opts.offset - opts_.offset);
|
|
assert(!opts.all || !opts.blocking || off == buffers::size(bufs));
|
|
return off;
|
|
}
|
|
#pragma GCC diagnostic pop
|
|
|
|
/// Lowest-level'ish write() call. This call only conducts a single operation
|
|
/// (no looping) and can return early with a partial write(). It does have
|
|
/// branches for various write_opts. The arguments involve `struct ::iovec`
|
|
/// which we do not expose to the ircd.h API; thus this function is internal to
|
|
/// ircd::fs. There is no reason to use this function in lieu of the public
|
|
/// fs::read() suite.
|
|
size_t
|
|
ircd::fs::write(const fd &fd,
|
|
const const_iovec_view &iov,
|
|
const write_opts &opts)
|
|
{
|
|
assert(opts.op == op::WRITE);
|
|
|
|
#ifdef IRCD_USE_IOU
|
|
if(likely(iou::system && opts.aio))
|
|
return iou::write(fd, iov, opts);
|
|
#endif
|
|
|
|
#ifdef IRCD_USE_AIO
|
|
if(likely(aio::system && opts.aio))
|
|
return aio::write(fd, iov, opts);
|
|
#endif
|
|
|
|
#ifdef HAVE_PWRITEV2
|
|
return support::pwritev2?
|
|
_write_pwritev2(fd, iov, opts):
|
|
_write_pwritev(fd, iov, opts);
|
|
#else
|
|
return _write_pwritev(fd, iov, opts);
|
|
#endif
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::_write_pwritev(const fd &fd,
|
|
const const_iovec_view &iov,
|
|
const write_opts &opts)
|
|
{
|
|
ssize_t ret; do
|
|
{
|
|
ret = ::pwritev(int(fd), iov.data(), iov.size(), opts.offset);
|
|
}
|
|
while(!opts.interruptible && unlikely(ret == -1 && errno == EINTR));
|
|
|
|
static_assert(EAGAIN == EWOULDBLOCK);
|
|
if(unlikely(!opts.blocking && ret == -1 && errno == EAGAIN))
|
|
return 0UL;
|
|
|
|
if(unlikely(ret == -1))
|
|
throw std::system_error
|
|
{
|
|
errno, std::system_category()
|
|
};
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef HAVE_PWRITEV2
|
|
size_t
|
|
ircd::fs::_write_pwritev2(const fd &fd,
|
|
const const_iovec_view &iov,
|
|
const write_opts &opts)
|
|
{
|
|
// Manpages sez that when appending with RWF_APPEND, the offset has no
|
|
// effect on the write; but if the value of the offset is -1 then the
|
|
// fd's offset is updated, otherwise it is not.
|
|
const off_t &offset
|
|
{
|
|
opts.offset == -1 && !opts.update_offset? 0 : opts.offset
|
|
};
|
|
|
|
ssize_t ret; do
|
|
{
|
|
ret = ::pwritev2(int(fd), iov.data(), iov.size(), opts.offset, flags(opts));
|
|
}
|
|
while(!opts.interruptible && unlikely(ret == -1 && errno == EINTR));
|
|
|
|
static_assert(EAGAIN == EWOULDBLOCK);
|
|
if(!opts.blocking && ret == -1 && errno == EAGAIN)
|
|
return 0UL;
|
|
|
|
if(unlikely(ret == -1))
|
|
throw std::system_error
|
|
{
|
|
errno, std::system_category()
|
|
};
|
|
|
|
return ret;
|
|
}
|
|
#endif HAVE_PWRITEV2
|
|
|
|
int
|
|
ircd::fs::flags(const write_opts &opts)
|
|
{
|
|
int ret{0};
|
|
|
|
#if defined(RWF_APPEND)
|
|
assert(opts.offset >= 0 || support::append);
|
|
if(support::append && opts.offset == -1)
|
|
ret |= RWF_APPEND;
|
|
#endif
|
|
|
|
#if defined(RWF_HIPRI)
|
|
if(support::hipri && reqprio(opts.priority) == reqprio(opts::highest_priority))
|
|
ret |= RWF_HIPRI;
|
|
#endif
|
|
|
|
#if defined(RWF_NOWAIT)
|
|
if(support::nowait && !opts.blocking)
|
|
ret |= RWF_NOWAIT;
|
|
#endif
|
|
|
|
#if defined(RWF_DSYNC)
|
|
if(support::dsync && opts.sync && !opts.metadata)
|
|
ret |= RWF_DSYNC;
|
|
#endif
|
|
|
|
#if defined(RWF_SYNC)
|
|
if(support::sync && opts.sync && opts.metadata)
|
|
ret |= RWF_SYNC;
|
|
#endif
|
|
|
|
#ifdef RWF_WRITE_LIFE_SHIFT
|
|
if(support::rwf_write_life && opts.write_life)
|
|
ret |= (opts.write_life << (RWF_WRITE_LIFE_SHIFT));
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/wait.h
|
|
//
|
|
|
|
namespace ircd::fs
|
|
{
|
|
static constexpr asio::posix::stream_descriptor::wait_type translate(const ready &) noexcept
|
|
__attribute__((const));
|
|
}
|
|
|
|
decltype(ircd::fs::wait_opts_default)
|
|
ircd::fs::wait_opts_default;
|
|
|
|
void
|
|
ircd::fs::wait(const fd &fd,
|
|
const wait_opts &opts)
|
|
{
|
|
assert(opts.op == op::WAIT);
|
|
|
|
const auto &wait_type
|
|
{
|
|
translate(opts.ready)
|
|
};
|
|
|
|
boost::asio::posix::stream_descriptor sd
|
|
{
|
|
ios::get(), int(fd)
|
|
};
|
|
|
|
const unwind release{[&sd]
|
|
{
|
|
sd.release();
|
|
}};
|
|
|
|
const auto interruption{[&sd]
|
|
(ctx::ctx *const &interruptor)
|
|
{
|
|
sd.cancel();
|
|
}};
|
|
|
|
boost::system::error_code ec; continuation
|
|
{
|
|
continuation::asio_predicate, interruption, [&wait_type, &sd, &ec]
|
|
(auto &yield)
|
|
{
|
|
sd.async_wait(wait_type, yield[ec]);
|
|
}
|
|
};
|
|
|
|
if(unlikely(ec))
|
|
throw_system_error(ec);
|
|
}
|
|
|
|
constexpr
|
|
boost::asio::posix::stream_descriptor::wait_type
|
|
ircd::fs::translate(const ready &ready)
|
|
noexcept
|
|
{
|
|
using wait_type = boost::asio::posix::stream_descriptor::wait_type;
|
|
|
|
switch(ready)
|
|
{
|
|
case ready::ANY:
|
|
return wait_type::wait_read | wait_type::wait_write | wait_type::wait_error;
|
|
|
|
case ready::READ:
|
|
return wait_type::wait_read;
|
|
|
|
case ready::WRITE:
|
|
return wait_type::wait_write;
|
|
|
|
case ready::ERROR:
|
|
default:
|
|
return wait_type::wait_error;
|
|
}
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::fs::reflect(const ready &ready)
|
|
{
|
|
switch(ready)
|
|
{
|
|
case ready::ANY: return "ANY";
|
|
case ready::READ: return "READ";
|
|
case ready::WRITE: return "WRITE";
|
|
case ready::ERROR: return "ERROR";
|
|
}
|
|
|
|
return "?????";
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/aio.h
|
|
//
|
|
|
|
decltype(ircd::fs::aio::MAX_EVENTS)
|
|
ircd::fs::aio::MAX_EVENTS
|
|
{
|
|
info::aio_max
|
|
};
|
|
|
|
decltype(ircd::fs::aio::MAX_REQPRIO)
|
|
ircd::fs::aio::MAX_REQPRIO
|
|
{
|
|
info::aio_reqprio_max
|
|
};
|
|
|
|
/// Conf item to control whether aio is enabled or bypassed.
|
|
decltype(ircd::fs::aio::enable)
|
|
ircd::fs::aio::enable
|
|
{
|
|
{ "name", "ircd.fs.aio.enable" },
|
|
{ "default", true },
|
|
{ "persist", false },
|
|
};
|
|
|
|
/// Global stats structure
|
|
decltype(ircd::fs::aio::stats)
|
|
ircd::fs::aio::stats;
|
|
|
|
/// Non-null when aio is available for use
|
|
decltype(ircd::fs::aio::system)
|
|
ircd::fs::aio::system;
|
|
|
|
//
|
|
// init
|
|
//
|
|
|
|
#ifndef IRCD_USE_AIO
|
|
[[gnu::weak]]
|
|
ircd::fs::aio::init::init()
|
|
{
|
|
assert(!system);
|
|
}
|
|
#endif
|
|
|
|
#ifndef IRCD_USE_AIO
|
|
[[gnu::weak]]
|
|
ircd::fs::aio::init::~init()
|
|
noexcept
|
|
{
|
|
assert(!system);
|
|
}
|
|
#endif
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/iou.h
|
|
//
|
|
|
|
decltype(ircd::fs::iou::support)
|
|
ircd::fs::iou::support
|
|
{
|
|
#ifdef IRCD_USE_IOU
|
|
info::kernel_version[0] > 5 ||
|
|
(info::kernel_version[0] >= 5 && info::kernel_version[1] >= 1)
|
|
#else
|
|
false
|
|
#endif
|
|
};
|
|
|
|
/// Conf item to control whether iou is enabled or bypassed.
|
|
decltype(ircd::fs::iou::enable)
|
|
ircd::fs::iou::enable
|
|
{
|
|
{ "name", "ircd.fs.iou.enable" },
|
|
{ "default", false },
|
|
{ "persist", false },
|
|
};
|
|
|
|
/// Global stats structure
|
|
decltype(ircd::fs::iou::stats)
|
|
ircd::fs::iou::stats;
|
|
|
|
/// Non-null when iou is available for use
|
|
decltype(ircd::fs::iou::system)
|
|
ircd::fs::iou::system;
|
|
|
|
//
|
|
// init
|
|
//
|
|
|
|
#ifndef IRCD_USE_IOU
|
|
[[gnu::weak]]
|
|
ircd::fs::iou::init::init()
|
|
{
|
|
assert(!system);
|
|
}
|
|
#endif
|
|
|
|
#ifndef IRCD_USE_IOU
|
|
[[gnu::weak]]
|
|
ircd::fs::iou::init::~init()
|
|
noexcept
|
|
{
|
|
assert(!system);
|
|
}
|
|
#endif
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/fd.h
|
|
//
|
|
|
|
namespace ircd::fs
|
|
{
|
|
static uint flags(const fd::opts &);
|
|
static uint flags(const std::ios::openmode &);
|
|
static long pathconf(const fd &, const int &arg);
|
|
}
|
|
|
|
decltype(ircd::fs::fd::opts::direct_io_enable)
|
|
ircd::fs::fd::opts::direct_io_enable
|
|
{
|
|
{ "name", "ircd.fs.fd.direct_io_enable" },
|
|
{ "default", true },
|
|
{ "persist", false },
|
|
};
|
|
|
|
#if defined(POSIX_FADV_DONTNEED)
|
|
size_t
|
|
ircd::fs::evict(const fd &fd,
|
|
const size_t &count,
|
|
const opts &opts)
|
|
{
|
|
return advise(fd, POSIX_FADV_DONTNEED, count, opts);
|
|
}
|
|
#else
|
|
#warning "POSIX_FADV_DONTNEED not available on this platform."
|
|
size_t
|
|
ircd::fs::evict(const fd &fd,
|
|
const size_t &count,
|
|
const opts &opts)
|
|
{
|
|
return 0UL;
|
|
}
|
|
#endif
|
|
|
|
#if defined(HAVE_POSIX_FADVISE)
|
|
size_t
|
|
ircd::fs::advise(const fd &fd,
|
|
const int &advice,
|
|
const size_t &count,
|
|
const opts &opts)
|
|
{
|
|
static const size_t max_count
|
|
{
|
|
128_KiB
|
|
};
|
|
|
|
size_t i(0), off, cnt; do
|
|
{
|
|
off = opts.offset + max_count * i++;
|
|
cnt = std::min(opts.offset + count - off, max_count);
|
|
switch(const auto r(::posix_fadvise(fd, off, cnt, advice)); r)
|
|
{
|
|
case 0: break;
|
|
default: throw_system_error(r);
|
|
}
|
|
}
|
|
while(off + cnt < opts.offset + count);
|
|
return count;
|
|
}
|
|
#else
|
|
#warning "posix_fadvise(2) not available for this compilation."
|
|
size_t
|
|
ircd::fs::advise(const fd &fd,
|
|
const int &advice,
|
|
const size_t &count,
|
|
const opts &opts)
|
|
{
|
|
return 0UL;
|
|
}
|
|
#endif
|
|
|
|
#if defined(HAVE_FCNTL_H) && defined(F_SET_FILE_RW_HINT)
|
|
void
|
|
ircd::fs::write_life(const fd &fd,
|
|
const uint64_t &hint)
|
|
{
|
|
if(!support::rwh_write_life)
|
|
return;
|
|
|
|
syscall(::fcntl, int(fd), F_SET_FILE_RW_HINT, &hint);
|
|
}
|
|
#else
|
|
#warning "F_SET_FILE_RW_HINT not supported on platform."
|
|
void
|
|
ircd::fs::write_life(const fd &fd,
|
|
const uint64_t &hint)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#if defined(HAVE_FCNTL_H) && defined(F_GET_FILE_RW_HINT)
|
|
uint64_t
|
|
ircd::fs::write_life(const fd &fd)
|
|
noexcept try
|
|
{
|
|
uint64_t ret;
|
|
syscall(::fcntl, int(fd), F_GET_FILE_RW_HINT, &ret);
|
|
return ret;
|
|
}
|
|
catch(const std::system_error &e)
|
|
{
|
|
log::derror
|
|
{
|
|
log, "fcntl(F_GET_FILE_RW_HINT) fd:%d :%s",
|
|
int(fd),
|
|
e.what()
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#warning "F_GET_FILE_RW_HINT not supported on platform."
|
|
uint64_t
|
|
ircd::fs::write_life(const fd &fd)
|
|
{
|
|
return 0UL;
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_STAT_H
|
|
ulong
|
|
ircd::fs::device(const fd &fd)
|
|
{
|
|
struct stat st{0};
|
|
syscall(::fstat, fd, &st);
|
|
return st.st_dev;
|
|
}
|
|
#else
|
|
ulong
|
|
ircd::fs::device(const fd &fd)
|
|
{
|
|
static_assert
|
|
(
|
|
0, "Please implement this definition"
|
|
)
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_STATFS_H
|
|
ulong
|
|
ircd::fs::fstype(const fd &fd)
|
|
{
|
|
struct statfs f{0};
|
|
syscall(::fstatfs, fd, &f);
|
|
return f.f_type;
|
|
}
|
|
#else
|
|
ulong
|
|
ircd::fs::fstype(const fd &fd)
|
|
{
|
|
static_assert
|
|
(
|
|
0, "Please implement this definition"
|
|
)
|
|
}
|
|
#endif
|
|
|
|
#ifdef __linux__
|
|
size_t
|
|
ircd::fs::block_size(const fd &fd)
|
|
{
|
|
return 512UL;
|
|
}
|
|
#elif defined(HAVE_SYS_STAT_H)
|
|
size_t
|
|
ircd::fs::block_size(const fd &fd)
|
|
{
|
|
struct stat st;
|
|
syscall(::fstat, fd, &st);
|
|
return st.st_blksize;
|
|
}
|
|
#else
|
|
size_t
|
|
ircd::fs::block_size(const fd &fd)
|
|
{
|
|
return info::page_size;
|
|
}
|
|
#endif
|
|
|
|
long
|
|
ircd::fs::pathconf(const fd &fd,
|
|
const int &arg)
|
|
{
|
|
return syscall(::fpathconf, fd, arg);
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::size(const fd &fd)
|
|
{
|
|
const off_t cur
|
|
{
|
|
syscall(::lseek, fd, 0, SEEK_CUR)
|
|
};
|
|
|
|
const off_t end
|
|
{
|
|
syscall(::lseek, fd, 0, SEEK_END)
|
|
};
|
|
|
|
syscall(::lseek, fd, cur, SEEK_SET);
|
|
return end;
|
|
}
|
|
|
|
//
|
|
// fd::opts
|
|
//
|
|
|
|
ircd::fs::fd::opts::opts(const std::ios::openmode &mode)
|
|
:mode
|
|
{
|
|
mode
|
|
}
|
|
,flags
|
|
{
|
|
fs::flags(mode)
|
|
}
|
|
,mask
|
|
{
|
|
flags & O_CREAT?
|
|
S_IRUSR | S_IWUSR:
|
|
0U
|
|
}
|
|
,ate
|
|
{
|
|
bool(mode & std::ios::ate)
|
|
}
|
|
{
|
|
}
|
|
|
|
//
|
|
// fd::fd
|
|
//
|
|
|
|
ircd::fs::fd::fd(const int &fdno)
|
|
:fdno
|
|
{
|
|
fdno
|
|
}
|
|
{
|
|
}
|
|
|
|
ircd::fs::fd::fd(const string_view &path)
|
|
:fd
|
|
{
|
|
path, opts{}
|
|
}
|
|
{
|
|
}
|
|
|
|
ircd::fs::fd::fd(const string_view &path,
|
|
const opts &opts)
|
|
:fd
|
|
{
|
|
AT_FDCWD, path, opts
|
|
}
|
|
{
|
|
}
|
|
|
|
ircd::fs::fd::fd(const int &dirfd,
|
|
const string_view &path,
|
|
const opts &opts)
|
|
try
|
|
:fdno
|
|
{
|
|
-1 // sentinel value for inert dtor
|
|
}
|
|
{
|
|
const unwind_exceptional dtor_on_error
|
|
{
|
|
[this] { this->~fd(); }
|
|
};
|
|
|
|
const mode_t mode
|
|
{
|
|
mode_t(opts.mask)
|
|
};
|
|
|
|
const uint &flags
|
|
{
|
|
fs::flags(opts)
|
|
};
|
|
|
|
const int &advise
|
|
{
|
|
opts.direct?
|
|
0:
|
|
opts.random?
|
|
POSIX_FADV_RANDOM:
|
|
opts.sequential?
|
|
POSIX_FADV_SEQUENTIAL:
|
|
opts.dontneed?
|
|
POSIX_FADV_DONTNEED:
|
|
0
|
|
};
|
|
|
|
{
|
|
const prof::syscall_usage_warning message
|
|
{
|
|
"fs::fs::fd(): openat(2): %s", path
|
|
};
|
|
|
|
assert((flags & ~O_CREAT) || mode != 0);
|
|
fdno = syscall(::openat, dirfd, path_cstr(path), flags, mode);
|
|
}
|
|
|
|
if(advise)
|
|
fs::advise(*this, advise);
|
|
|
|
if(opts.ate)
|
|
syscall(::lseek, fdno, 0, SEEK_END);
|
|
}
|
|
catch(const std::system_error &e)
|
|
{
|
|
if(opts.errlog)
|
|
log::derror
|
|
{
|
|
log, "`%s' :%s",
|
|
path,
|
|
e.what(),
|
|
};
|
|
|
|
throw;
|
|
}
|
|
|
|
ircd::fs::fd::fd(fd &&o)
|
|
noexcept
|
|
:fdno
|
|
{
|
|
std::move(o.fdno)
|
|
}
|
|
{
|
|
o.fdno = -1;
|
|
}
|
|
|
|
ircd::fs::fd &
|
|
ircd::fs::fd::operator=(fd &&o)
|
|
noexcept
|
|
{
|
|
this->~fd();
|
|
fdno = std::move(o.fdno);
|
|
o.fdno = -1;
|
|
return *this;
|
|
}
|
|
|
|
ircd::fs::fd::~fd()
|
|
noexcept
|
|
{
|
|
if(likely(fdno >= 0)) try
|
|
{
|
|
syscall(::close, fdno);
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::critical
|
|
{
|
|
"Failed to close fd:%d :%s",
|
|
fdno,
|
|
e.what()
|
|
};
|
|
}
|
|
}
|
|
|
|
int
|
|
ircd::fs::fd::release()
|
|
noexcept
|
|
{
|
|
const int fdno(this->fdno);
|
|
this->fdno = -1;
|
|
return fdno;
|
|
}
|
|
|
|
ircd::fs::fd::opts
|
|
ircd::fs::fd::options()
|
|
const
|
|
{
|
|
opts ret;
|
|
ret.flags = syscall(::fcntl, int(*this), F_GETFL, 0);
|
|
|
|
if((ret.flags & O_RDONLY) == O_RDONLY)
|
|
ret.mode = std::ios::in;
|
|
|
|
if((ret.flags & O_WRONLY) == O_WRONLY)
|
|
ret.mode = std::ios::out;
|
|
|
|
if((ret.flags & O_RDWR) == O_RDWR)
|
|
ret.mode = std::ios::in | std::ios::out;
|
|
|
|
ret.direct = ret.flags & O_DIRECT;
|
|
ret.cloexec = ret.flags & O_CLOEXEC;
|
|
ret.nocreate = ~ret.flags & O_CREAT;
|
|
ret.blocking = ret.flags & O_NONBLOCK;
|
|
return ret;
|
|
}
|
|
|
|
uint
|
|
ircd::fs::flags(const fd::opts &opts)
|
|
{
|
|
uint ret(opts.flags);
|
|
ret |= fs::flags(opts.mode);
|
|
ret |= opts.direct? O_DIRECT : 0UL;
|
|
ret |= opts.cloexec? O_CLOEXEC : 0UL;
|
|
ret &= opts.nocreate? ~O_CREAT : ret;
|
|
ret |= !opts.blocking? O_NONBLOCK : 0UL;
|
|
return ret;
|
|
}
|
|
|
|
uint
|
|
ircd::fs::flags(const std::ios::openmode &mode)
|
|
{
|
|
static const auto rdwr
|
|
{
|
|
std::ios::in | std::ios::out
|
|
};
|
|
|
|
uint ret{0};
|
|
if((mode & rdwr) == rdwr)
|
|
ret |= O_RDWR;
|
|
else if(mode & std::ios::out)
|
|
ret |= O_WRONLY;
|
|
else
|
|
ret |= O_RDONLY;
|
|
|
|
ret |= mode & std::ios::trunc? O_TRUNC : 0;
|
|
ret |= mode & std::ios::app? O_APPEND : 0;
|
|
ret |= ret & O_WRONLY? O_CREAT : 0;
|
|
ret |= ret & O_RDWR && ret & (O_TRUNC | O_APPEND)? O_CREAT : 0;
|
|
return ret;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/opts.h
|
|
//
|
|
|
|
decltype(ircd::fs::opts_default)
|
|
ircd::fs::opts_default
|
|
{};
|
|
|
|
decltype(ircd::fs::opts::highest_priority)
|
|
ircd::fs::opts::highest_priority
|
|
{
|
|
std::numeric_limits<decltype(priority)>::min()
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/op.h
|
|
//
|
|
|
|
ircd::string_view
|
|
ircd::fs::reflect(const op &op)
|
|
{
|
|
switch(op)
|
|
{
|
|
case op::NOOP: return "NOOP";
|
|
case op::READ: return "READ";
|
|
case op::WRITE: return "WRITE";
|
|
case op::SYNC: return "SYNC";
|
|
case op::WAIT: return "WAIT";
|
|
}
|
|
|
|
return "????";
|
|
}
|
|
|
|
#ifndef IRCD_USE_AIO
|
|
[[gnu::weak]]
|
|
ircd::fs::op
|
|
ircd::fs::aio::translate(const int &val)
|
|
{
|
|
return op::NOOP;
|
|
}
|
|
#endif
|
|
|
|
#ifndef IRCD_USE_IOU
|
|
[[gnu::weak]]
|
|
ircd::fs::op
|
|
ircd::fs::iou::translate(const int &val)
|
|
{
|
|
return op::NOOP;
|
|
}
|
|
#endif
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/iov.h
|
|
//
|
|
|
|
ircd::fs::const_iovec_view
|
|
ircd::fs::make_iov(const iovec_view &iov,
|
|
const mutable_buffers &bufs,
|
|
const size_t &offset)
|
|
{
|
|
assert(offset <= buffers::size(bufs));
|
|
const size_t max
|
|
{
|
|
std::min(iov.size(), bufs.size())
|
|
};
|
|
|
|
size_t i(0), off(0);
|
|
for(; i < max; off += size(bufs[i++]))
|
|
if(size(bufs[i]) >= offset - off)
|
|
{
|
|
assert(offset >= off);
|
|
off = offset - off;
|
|
break;
|
|
}
|
|
|
|
assert(i <= max);
|
|
if(i < max)
|
|
{
|
|
assert(off <= size(bufs[i]));
|
|
iov.at(i) =
|
|
{
|
|
data(bufs[i]) + off, size(bufs[i]) - off
|
|
};
|
|
|
|
for(++i; i < max; ++i)
|
|
iov.at(i) =
|
|
{
|
|
data(bufs[i]), size(bufs[i])
|
|
};
|
|
}
|
|
|
|
assert(i <= max);
|
|
const const_iovec_view ret{iov.data(), i};
|
|
assert(bytes(ret) <= buffer::buffers::size(bufs));
|
|
return ret;
|
|
}
|
|
|
|
ircd::fs::const_iovec_view
|
|
ircd::fs::make_iov(const iovec_view &iov,
|
|
const const_buffers &bufs,
|
|
const size_t &offset)
|
|
{
|
|
assert(offset <= buffers::size(bufs));
|
|
const size_t max
|
|
{
|
|
std::min(iov.size(), bufs.size())
|
|
};
|
|
|
|
size_t i(0), off(0);
|
|
for(; i < max; off += size(bufs[i++]))
|
|
if(size(bufs[i]) >= offset - off)
|
|
{
|
|
assert(offset >= off);
|
|
off = offset - off;
|
|
break;
|
|
}
|
|
|
|
assert(i <= max);
|
|
if(i < max)
|
|
{
|
|
assert(off <= size(bufs[i]));
|
|
iov.at(i) =
|
|
{
|
|
const_cast<char *>(data(bufs[i])) + off, size(bufs[i]) - off
|
|
};
|
|
|
|
for(++i; i < max; ++i)
|
|
iov.at(i) =
|
|
{
|
|
const_cast<char *>(data(bufs[i])), size(bufs[i])
|
|
};
|
|
}
|
|
|
|
assert(i <= max);
|
|
const const_iovec_view ret{iov.data(), i};
|
|
assert(bytes(ret) <= buffer::buffers::size(bufs));
|
|
return ret;
|
|
}
|
|
|
|
size_t
|
|
ircd::fs::bytes(const const_iovec_view &iov)
|
|
{
|
|
return std::accumulate(begin(iov), end(iov), size_t(0), []
|
|
(auto ret, const auto &iov)
|
|
{
|
|
return ret += iov.iov_len;
|
|
});
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// fs/error.h
|
|
//
|
|
|
|
std::string
|
|
ircd::string(const boost::filesystem::filesystem_error &e)
|
|
{
|
|
return ircd::string(512, [&e]
|
|
(const mutable_buffer &buf)
|
|
{
|
|
return string(buf, e);
|
|
});
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::string(const mutable_buffer &buf,
|
|
const boost::filesystem::filesystem_error &e)
|
|
{
|
|
return fmt::sprintf
|
|
{
|
|
buf, "%s :%s", e.code().category().name(), e.what()
|
|
};
|
|
}
|
|
|
|
std::system_error
|
|
ircd::make_system_error(const boost::filesystem::filesystem_error &e)
|
|
{
|
|
return std::system_error
|
|
{
|
|
make_error_code(e), e.what()
|
|
};
|
|
}
|
|
|
|
std::error_code
|
|
ircd::make_error_code(const boost::filesystem::filesystem_error &e)
|
|
{
|
|
const boost::system::error_code &ec
|
|
{
|
|
e.code()
|
|
};
|
|
|
|
return make_error_code(ec);
|
|
}
|
|
|
|
//
|
|
// error::error
|
|
//
|
|
|
|
decltype(ircd::fs::error::buf) thread_local
|
|
ircd::fs::error::buf;
|
|
|
|
ircd::fs::error::error(const boost::filesystem::filesystem_error &e)
|
|
:std::system_error
|
|
{
|
|
make_system_error(e)
|
|
}
|
|
{
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Internal utils
|
|
//
|
|
|
|
/// Translate an ircd::fs opts priority integer to an AIO priority integer.
|
|
/// The ircd::fs priority integer is like a nice value. The AIO value is
|
|
/// positive [0, MAX_REQPRIO]. This function takes an ircd::fs value and
|
|
/// shifts it to the AIO value.
|
|
int
|
|
ircd::fs::reqprio(int input)
|
|
noexcept
|
|
{
|
|
const auto &max_reqprio
|
|
{
|
|
aio::MAX_REQPRIO
|
|
};
|
|
|
|
static const auto median
|
|
{
|
|
int(max_reqprio / 2)
|
|
};
|
|
|
|
input = std::max(input, 0 - median);
|
|
input = std::min(input, median);
|
|
input = max_reqprio - (input + median);
|
|
assert(input >= 0 && input <= int(max_reqprio));
|
|
return input;
|
|
}
|