1 /* Copyright (c) 2015-2021. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include <simgrid/plugins/file_system.h>
7 #include <simgrid/s4u/Actor.hpp>
8 #include <simgrid/s4u/Comm.hpp>
9 #include <simgrid/s4u/Engine.hpp>
10 #include <xbt/config.hpp>
11 #include <xbt/parse_units.hpp>
13 #include "src/surf/HostImpl.hpp"
16 #include <boost/algorithm/string.hpp>
17 #include <boost/algorithm/string/join.hpp>
18 #include <boost/algorithm/string/split.hpp>
23 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(s4u_file, s4u, "S4U files");
24 int sg_storage_max_file_descriptors = 1024;
26 /** @defgroup plugin_filesystem Plugin FileSystem
28 * This adds the notion of Files on top of the storage notion that provided by the core of SimGrid.
29 * Activate this plugin at will.
34 template class xbt::Extendable<s4u::File>;
37 simgrid::xbt::Extension<Disk, FileSystemDiskExt> FileSystemDiskExt::EXTENSION_ID;
38 simgrid::xbt::Extension<Host, FileDescriptorHostExt> FileDescriptorHostExt::EXTENSION_ID;
40 const Disk* File::find_local_disk_on(const Host* host)
42 const Disk* d = nullptr;
43 size_t longest_prefix_length = 0;
44 for (auto const& disk : host->get_disks()) {
45 std::string current_mount;
46 if (disk->get_host() != host)
47 current_mount = disk->extension<FileSystemDiskExt>()->get_mount_point(disk->get_host());
49 current_mount = disk->extension<FileSystemDiskExt>()->get_mount_point();
50 mount_point_ = fullpath_.substr(0, current_mount.length());
51 if (mount_point_ == current_mount && current_mount.length() > longest_prefix_length) {
52 /* The current mount name is found in the full path and is bigger than the previous*/
53 longest_prefix_length = current_mount.length();
56 xbt_assert(longest_prefix_length > 0, "Can't find mount point for '%s' on '%s'", fullpath_.c_str(),
58 /* Mount point found, split fullpath_ into mount_name and path+filename*/
59 mount_point_ = fullpath_.substr(0, longest_prefix_length);
60 if (mount_point_ == std::string("/"))
63 path_ = fullpath_.substr(longest_prefix_length, fullpath_.length());
64 XBT_DEBUG("%s + %s", mount_point_.c_str(), path_.c_str());
69 File::File(const std::string& fullpath, void* userdata) : File(fullpath, Host::current(), userdata) {}
71 File::File(const std::string& fullpath, const_sg_host_t host, void* userdata) : fullpath_(fullpath)
73 kernel::actor::simcall([this, &host, userdata] {
74 this->set_data(userdata);
75 // this cannot fail because we get a xbt_die if the mountpoint does not exist
76 local_disk_ = find_local_disk_on(host);
78 // assign a file descriptor id to the newly opened File
79 auto* ext = host->extension<simgrid::s4u::FileDescriptorHostExt>();
80 if (ext->file_descriptor_table == nullptr) {
81 ext->file_descriptor_table = std::make_unique<std::vector<int>>(sg_storage_max_file_descriptors);
82 std::iota(ext->file_descriptor_table->rbegin(), ext->file_descriptor_table->rend(), 0); // Fill with ..., 1, 0.
84 xbt_assert(not ext->file_descriptor_table->empty(), "Too much files are opened! Some have to be closed.");
85 desc_id = ext->file_descriptor_table->back();
86 ext->file_descriptor_table->pop_back();
88 XBT_DEBUG("\tOpen file '%s'", path_.c_str());
89 std::map<std::string, sg_size_t, std::less<>>* content = nullptr;
90 content = local_disk_->extension<FileSystemDiskExt>()->get_content();
92 // if file does not exist create an empty file
94 auto sz = content->find(path_);
95 if (sz != content->end()) {
99 content->insert({path_, size_});
100 XBT_DEBUG("File '%s' was not found, file created.", path_.c_str());
108 std::vector<int>* desc_table =
109 Host::current()->extension<simgrid::s4u::FileDescriptorHostExt>()->file_descriptor_table.get();
110 kernel::actor::simcall([this, desc_table] { desc_table->push_back(this->desc_id); });
113 void File::dump() const
115 XBT_INFO("File Descriptor information:\n"
116 "\t\tFull path: '%s'\n"
118 "\t\tMount point: '%s'\n"
119 "\t\tDisk Id: '%s'\n"
120 "\t\tHost Id: '%s'\n"
121 "\t\tFile Descriptor Id: %d",
122 get_path(), size_, mount_point_.c_str(), local_disk_->get_cname(), local_disk_->get_host()->get_cname(),
126 sg_size_t File::read(sg_size_t size)
128 if (size_ == 0) /* Nothing to read, return */
130 Host* host = nullptr;
131 // if the current position is close to the end of the file, we may not be able to read the requested size
132 sg_size_t to_read = std::min(size, size_ - current_position_);
133 sg_size_t read_size = 0;
135 /* Find the host where the file is physically located and read it */
136 host = local_disk_->get_host();
137 XBT_DEBUG("READ %s on disk '%s'", get_path(), local_disk_->get_cname());
138 read_size = local_disk_->read(to_read);
140 current_position_ += read_size;
142 if (host && host->get_name() != Host::current()->get_name() && read_size > 0) {
143 /* the file is hosted on a remote host, initiate a communication between src and dest hosts for data transfer */
144 XBT_DEBUG("File is on %s remote host, initiate data transfer of %llu bytes.", host->get_cname(), read_size);
145 Comm::sendto(host, Host::current(), read_size);
151 /** @brief Write into a file (local or remote)
152 * @ingroup plugin_filesystem
154 * @param size of the file to write
155 * @param write_inside
156 * @return the number of bytes successfully write or -1 if an error occurred
158 sg_size_t File::write(sg_size_t size, bool write_inside)
160 if (size == 0) /* Nothing to write, return */
163 sg_size_t write_size = 0;
164 /* Find the host where the file is physically located (remote or local)*/
165 Host* host = local_disk_->get_host();
167 if (host && host->get_name() != Host::current()->get_name()) {
168 /* the file is hosted on a remote host, initiate a communication between src and dest hosts for data transfer */
169 XBT_DEBUG("File is on %s remote host, initiate data transfer of %llu bytes.", host->get_cname(), size);
170 Comm::sendto(Host::current(), host, size);
172 XBT_DEBUG("WRITE %s on disk '%s'. size '%llu/%llu' '%llu:%llu'", get_path(), local_disk_->get_cname(), size, size_,
173 sg_disk_get_size_used(local_disk_), sg_disk_get_size(local_disk_));
174 // If the disk is full before even starting to write
175 if (sg_disk_get_size_used(local_disk_) >= sg_disk_get_size(local_disk_))
177 if (not write_inside) {
178 /* Subtract the part of the file that might disappear from the used sized on the storage element */
179 local_disk_->extension<FileSystemDiskExt>()->decr_used_size(size_ - current_position_);
180 write_size = local_disk_->write(size);
181 local_disk_->extension<FileSystemDiskExt>()->incr_used_size(write_size);
182 current_position_ += write_size;
183 size_ = current_position_;
185 write_size = local_disk_->write(size);
186 current_position_ += write_size;
187 if (current_position_ > size_)
188 size_ = current_position_;
190 kernel::actor::simcall([this] {
191 std::map<std::string, sg_size_t, std::less<>>* content = local_disk_->extension<FileSystemDiskExt>()->get_content();
193 content->erase(path_);
194 content->insert({path_, size_});
200 sg_size_t File::size() const
205 void File::seek(sg_offset_t offset)
207 current_position_ = offset;
210 void File::seek(sg_offset_t offset, int origin)
214 current_position_ = offset;
217 current_position_ += offset;
220 current_position_ = size_ + offset;
227 sg_size_t File::tell() const
229 return current_position_;
232 void File::move(const std::string& fullpath) const
234 /* Check if the new full path is on the same mount point */
235 if (fullpath.compare(0, mount_point_.length(), mount_point_) == 0) {
236 std::map<std::string, sg_size_t, std::less<>>* content = nullptr;
237 content = local_disk_->extension<FileSystemDiskExt>()->get_content();
239 auto sz = content->find(path_);
240 if (sz != content->end()) { // src file exists
241 sg_size_t new_size = sz->second;
242 content->erase(path_);
243 std::string path = fullpath.substr(mount_point_.length(), fullpath.length());
244 content->insert({path.c_str(), new_size});
245 XBT_DEBUG("Move file from %s to %s, size '%llu'", path_.c_str(), fullpath.c_str(), new_size);
247 XBT_WARN("File %s doesn't exist", path_.c_str());
251 XBT_WARN("New full path %s is not on the same mount point: %s.", fullpath.c_str(), mount_point_.c_str());
255 int File::unlink() const
257 /* Check if the file is on local storage */
258 auto* content = local_disk_->extension<FileSystemDiskExt>()->get_content();
259 const char* name = local_disk_->get_cname();
261 if (not content || content->find(path_) == content->end()) {
262 XBT_WARN("File %s is not on disk %s. Impossible to unlink", path_.c_str(), name);
265 XBT_DEBUG("UNLINK %s on disk '%s'", path_.c_str(), name);
267 local_disk_->extension<FileSystemDiskExt>()->decr_used_size(size_);
269 // Remove the file from storage
270 content->erase(path_);
276 int File::remote_copy(sg_host_t host, const std::string& fullpath)
278 /* Find the host where the file is physically located and read it */
279 Host* src_host = nullptr;
280 sg_size_t read_size = 0;
282 Host* dst_host = host;
283 size_t longest_prefix_length = 0;
287 src_host = local_disk_->get_host();
288 XBT_DEBUG("READ %s on disk '%s'", get_path(), local_disk_->get_cname());
289 read_size = local_disk_->read(size_);
290 current_position_ += read_size;
292 const Disk* dst_disk = nullptr;
294 for (auto const& disk : host->get_disks()) {
295 std::string current_mount = disk->extension<FileSystemDiskExt>()->get_mount_point();
296 std::string mount_point = std::string(fullpath).substr(0, current_mount.length());
297 if (mount_point == current_mount && current_mount.length() > longest_prefix_length) {
298 /* The current mount name is found in the full path and is bigger than the previous*/
299 longest_prefix_length = current_mount.length();
304 if (dst_disk == nullptr) {
305 XBT_WARN("Can't find mount point for '%s' on destination host '%s'", fullpath.c_str(), host->get_cname());
310 XBT_DEBUG("Initiate data transfer of %llu bytes between %s and %s.", read_size, src_host->get_cname(),
311 dst_host->get_cname());
312 Comm::sendto(src_host, dst_host, read_size);
315 /* Create file on remote host, write it and close it */
316 File fd(fullpath, dst_host, nullptr);
321 int File::remote_move(sg_host_t host, const std::string& fullpath)
323 int res = remote_copy(host, fullpath);
328 FileSystemDiskExt::FileSystemDiskExt(const Disk* ptr)
330 const char* size_str = ptr->get_property("size");
331 std::string dummyfile;
333 size_ = xbt_parse_get_size(dummyfile, -1, size_str, "disk size " + ptr->get_name());
335 const char* current_mount_str = ptr->get_property("mount");
336 if (current_mount_str)
337 mount_point_ = std::string(current_mount_str);
339 mount_point_ = std::string("/");
341 const char* content_str = ptr->get_property("content");
343 content_.reset(parse_content(content_str));
346 std::map<std::string, sg_size_t, std::less<>>* FileSystemDiskExt::parse_content(const std::string& filename)
348 if (filename.empty())
351 auto* parse_content = new std::map<std::string, sg_size_t, std::less<>>();
353 auto fs = std::unique_ptr<std::ifstream>(surf_ifsopen(filename));
354 xbt_assert(not fs->fail(), "Cannot open file '%s' (path=%s)", filename.c_str(),
355 (boost::join(surf_path, ":")).c_str());
358 std::vector<std::string> tokens;
360 std::getline(*fs, line);
362 if (line.length() > 0) {
363 boost::split(tokens, line, boost::is_any_of(" \t"), boost::token_compress_on);
364 xbt_assert(tokens.size() == 2, "Parse error in %s: %s", filename.c_str(), line.c_str());
365 sg_size_t size = std::stoull(tokens.at(1));
368 parse_content->insert({tokens.front(), size});
370 } while (not fs->eof());
371 return parse_content;
374 void FileSystemDiskExt::decr_used_size(sg_size_t size)
376 simgrid::kernel::actor::simcall([this, size] { used_size_ -= size; });
379 void FileSystemDiskExt::incr_used_size(sg_size_t size)
381 simgrid::kernel::actor::simcall([this, size] { used_size_ += size; });
386 using simgrid::s4u::FileDescriptorHostExt;
387 using simgrid::s4u::FileSystemDiskExt;
389 static void on_disk_creation(simgrid::s4u::Disk& d)
391 d.extension_set(new FileSystemDiskExt(&d));
394 static void on_host_creation(simgrid::s4u::Host& host)
396 host.extension_set<FileDescriptorHostExt>(new FileDescriptorHostExt());
399 static void on_platform_created()
401 for (auto const& host : simgrid::s4u::Engine::get_instance()->get_all_hosts()) {
402 const char* remote_disk_str = host->get_property("remote_disk");
403 if (remote_disk_str) {
404 std::vector<std::string> tokens;
405 boost::split(tokens, remote_disk_str, boost::is_any_of(":"));
406 std::string mount_point = tokens[0];
407 simgrid::s4u::Host* remote_host = simgrid::s4u::Host::by_name_or_null(tokens[2]);
408 xbt_assert(remote_host, "You're trying to access a host that does not exist. Please check your platform file");
410 const simgrid::s4u::Disk* disk = nullptr;
411 for (auto const& d : remote_host->get_disks())
412 if (d->get_name() == tokens[1]) {
417 xbt_assert(disk, "You're trying to mount a disk that does not exist. Please check your platform file");
418 disk->extension<FileSystemDiskExt>()->add_remote_mount(remote_host, mount_point);
419 host->add_disk(disk);
421 XBT_DEBUG("Host '%s' wants to mount a remote disk: %s of %s mounted on %s", host->get_cname(), disk->get_cname(),
422 remote_host->get_cname(), mount_point.c_str());
423 XBT_DEBUG("Host '%s' now has %zu disks", host->get_cname(), host->get_disks().size());
428 static void on_simulation_end()
430 XBT_DEBUG("Simulation is over, time to unregister remote disks if any");
431 for (auto const& host : simgrid::s4u::Engine::get_instance()->get_all_hosts()) {
432 const char* remote_disk_str = host->get_property("remote_disk");
433 if (remote_disk_str) {
434 std::vector<std::string> tokens;
435 boost::split(tokens, remote_disk_str, boost::is_any_of(":"));
436 XBT_DEBUG("Host '%s' wants to unmount a remote disk: %s of %s mounted on %s", host->get_cname(),
437 tokens[1].c_str(), tokens[2].c_str(), tokens[0].c_str());
438 host->remove_disk(tokens[1]);
439 XBT_DEBUG("Host '%s' now has %zu disks", host->get_cname(), host->get_disks().size());
444 /* **************************** Public interface *************************** */
445 /** @brief Initialize the file system plugin.
446 @ingroup plugin_filesystem
449 See the examples in :ref:`s4u_ex_disk_io`.
452 void sg_storage_file_system_init()
454 sg_storage_max_file_descriptors = 1024;
455 simgrid::config::bind_flag(sg_storage_max_file_descriptors, "storage/max_file_descriptors",
456 "Maximum number of concurrently opened files per host. Default is 1024");
458 if (not FileSystemDiskExt::EXTENSION_ID.valid()) {
459 FileSystemDiskExt::EXTENSION_ID = simgrid::s4u::Disk::extension_create<FileSystemDiskExt>();
460 simgrid::s4u::Disk::on_creation.connect(&on_disk_creation);
463 if (not FileDescriptorHostExt::EXTENSION_ID.valid()) {
464 FileDescriptorHostExt::EXTENSION_ID = simgrid::s4u::Host::extension_create<FileDescriptorHostExt>();
465 simgrid::s4u::Host::on_creation.connect(&on_host_creation);
467 simgrid::s4u::Engine::on_platform_created.connect(&on_platform_created);
468 simgrid::s4u::Engine::on_simulation_end.connect(&on_simulation_end);
471 sg_file_t sg_file_open(const char* fullpath, void* data)
473 return new simgrid::s4u::File(fullpath, data);
476 sg_size_t sg_file_read(sg_file_t fd, sg_size_t size)
478 return fd->read(size);
481 sg_size_t sg_file_write(sg_file_t fd, sg_size_t size)
483 return fd->write(size);
486 void sg_file_close(const_sg_file_t fd)
491 /** Retrieves the path to the file
492 * @ingroup plugin_filesystem
494 const char* sg_file_get_name(const_sg_file_t fd)
496 xbt_assert((fd != nullptr), "Invalid file descriptor");
497 return fd->get_path();
500 /** Retrieves the size of the file
501 * @ingroup plugin_filesystem
503 sg_size_t sg_file_get_size(const_sg_file_t fd)
508 void sg_file_dump(const_sg_file_t fd)
513 /** Retrieves the user data associated with the file
514 * @ingroup plugin_filesystem
516 void* sg_file_get_data(const_sg_file_t fd)
518 return fd->get_data();
521 /** Changes the user data associated with the file
522 * @ingroup plugin_filesystem
524 void sg_file_set_data(sg_file_t fd, void* data)
530 * @brief Set the file position indicator in the sg_file_t by adding offset bytes to the position specified by origin (either SEEK_SET, SEEK_CUR, or SEEK_END).
531 * @ingroup plugin_filesystem
533 * @param fd : file object that identifies the stream
534 * @param offset : number of bytes to offset from origin
535 * @param origin : Position used as reference for the offset. It is specified by one of the following constants defined
536 * in \<stdio.h\> exclusively to be used as arguments for this function (SEEK_SET = beginning of file,
537 * SEEK_CUR = current position of the file pointer, SEEK_END = end of file)
539 void sg_file_seek(sg_file_t fd, sg_offset_t offset, int origin)
541 fd->seek(offset, origin);
544 sg_size_t sg_file_tell(const_sg_file_t fd)
549 void sg_file_move(const_sg_file_t fd, const char* fullpath)
554 void sg_file_unlink(sg_file_t fd)
561 * @brief Copy a file to another location on a remote host.
562 * @ingroup plugin_filesystem
564 * @param file : the file to move
565 * @param host : the remote host where the file has to be copied
566 * @param fullpath : the complete path destination on the remote host
567 * @return If successful, the function returns 0. Otherwise, it returns -1.
569 int sg_file_rcopy(sg_file_t file, sg_host_t host, const char* fullpath)
571 return file->remote_copy(host, fullpath);
575 * @brief Move a file to another location on a remote host.
576 * @ingroup plugin_filesystem
578 * @param file : the file to move
579 * @param host : the remote host where the file has to be moved
580 * @param fullpath : the complete path destination on the remote host
581 * @return If successful, the function returns 0. Otherwise, it returns -1.
583 int sg_file_rmove(sg_file_t file, sg_host_t host, const char* fullpath)
585 return file->remote_move(host, fullpath);
588 sg_size_t sg_disk_get_size_free(const_sg_disk_t d)
590 return d->extension<FileSystemDiskExt>()->get_size() - d->extension<FileSystemDiskExt>()->get_used_size();
593 sg_size_t sg_disk_get_size_used(const_sg_disk_t d)
595 return d->extension<FileSystemDiskExt>()->get_used_size();
598 sg_size_t sg_disk_get_size(const_sg_disk_t d)
600 return d->extension<FileSystemDiskExt>()->get_size();
603 const char* sg_disk_get_mount_point(const_sg_disk_t d)
605 return d->extension<FileSystemDiskExt>()->get_mount_point();