fs_helpers.cpp File Reference

#include <util/fs_helpers.h>
#include <bitcoin-build-config.h>
#include <logging.h>
#include <sync.h>
#include <util/fs.h>
#include <util/syserror.h>
#include <cerrno>
#include <fstream>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <system_error>
#include <utility>
#include <fcntl.h>
#include <sys/resource.h>
#include <unistd.h>

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Namespaces
namespace	util

Functions
static std::map< std::string, std::unique_ptr< fsbridge::FileLock > > dir_locks	GUARDED_BY (cs_dir_locks)
	A map that contains all the currently held directory locks. More...
LockResult	util::LockDirectory (const fs::path &directory, const fs::path &lockfile_name, bool probe_only)
void	UnlockDirectory (const fs::path &directory, const fs::path &lockfile_name)
void	ReleaseDirectoryLocks ()
	Release all directory locks. More...
bool	CheckDiskSpace (const fs::path &dir, uint64_t additional_bytes)
std::streampos	GetFileSize (const char *path, std::streamsize max)
	Get the size of a file by scanning it. More...
bool	FileCommit (FILE *file)
	Ensure file contents are fully committed to disk, using a platform-specific feature analogous to fsync(). More...
void	DirectoryCommit (const fs::path &dirname)
	Sync directory contents. More...
bool	TruncateFile (FILE *file, unsigned int length)
int	RaiseFileDescriptorLimit (int nMinFD)
	this function tries to raise the file descriptor limit to the requested number. More...
void	AllocateFileRange (FILE *file, unsigned int offset, unsigned int length)
	this function tries to make a particular range of a file allocated (corresponding to disk space) it is advisory, and the range specified in the arguments will never contain live data More...
bool	RenameOver (fs::path src, fs::path dest)
	Rename src to dest. More...
bool	TryCreateDirectories (const fs::path &p)
	Ignores exceptions thrown by create_directories if the requested directory exists. More...
std::string	PermsToSymbolicString (fs::perms p)
	Convert fs::perms to symbolic string of the form 'rwxrwxrwx'. More...
std::optional< fs::perms >	InterpretPermString (const std::string &s)
	Interpret a custom permissions level string as fs::perms. More...

Variables
static GlobalMutex	cs_dir_locks
	Mutex to protect dir_locks. More...

Function Documentation

AllocateFileRange()

void AllocateFileRange	(	FILE *	file,
		unsigned int	offset,
		unsigned int	length
	)

this function tries to make a particular range of a file allocated (corresponding to disk space) it is advisory, and the range specified in the arguments will never contain live data

Definition at line 187 of file fs_helpers.cpp.

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CheckDiskSpace()

bool CheckDiskSpace	(	const fs::path &	dir,
		uint64_t	additional_bytes
	)

Definition at line 93 of file fs_helpers.cpp.

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DirectoryCommit()

void DirectoryCommit

(

const fs::path &

dirname

)

Sync directory contents.

This is required on some environments to ensure that newly created files are committed to disk.

Definition at line 139 of file fs_helpers.cpp.

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FileCommit()

bool FileCommit

(

FILE *

file

)

Ensure file contents are fully committed to disk, using a platform-specific feature analogous to fsync().

Definition at line 108 of file fs_helpers.cpp.

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GetFileSize()

std::streampos GetFileSize	(	const char *	path,
		std::streamsize	max = std::numeric_limits< std::streamsize >::max()
	)

Get the size of a file by scanning it.

Parameters

[in]	path	The file path
[in]	max	Stop seeking beyond this limit

Returns

The file size or max

Definition at line 101 of file fs_helpers.cpp.

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GUARDED_BY()

static std::map< std::string, std::unique_ptr< fsbridge::FileLock > > dir_locks GUARDED_BY ( cs_dir_locks  )

static

A map that contains all the currently held directory locks.

After successful locking, these will be held here until the global destructor cleans them up and thus automatically unlocks them, or ReleaseDirectoryLocks is called.

InterpretPermString()

std::optional< fs::perms > InterpretPermString

(

const std::string &

s

)

Interpret a custom permissions level string as fs::perms.

Parameters

[in]

s

Permission level string

Returns

Permissions as fs::perms

Definition at line 297 of file fs_helpers.cpp.

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PermsToSymbolicString()

std::string PermsToSymbolicString

(

fs::perms

p

)

Convert fs::perms to symbolic string of the form 'rwxrwxrwx'.

Parameters

[in]

p

the perms to be converted

Returns

Symbolic permissions string

Definition at line 274 of file fs_helpers.cpp.

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RaiseFileDescriptorLimit()

int RaiseFileDescriptorLimit

(

int

nMinFD

)

this function tries to raise the file descriptor limit to the requested number.

It returns the actual file descriptor limit (which may be more or less than nMinFD)

Definition at line 163 of file fs_helpers.cpp.

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ReleaseDirectoryLocks()

void ReleaseDirectoryLocks

(

)

Release all directory locks.

This is used for unit testing only, at runtime the global destructor will take care of the locks.

Definition at line 87 of file fs_helpers.cpp.

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RenameOver()

bool RenameOver	(	fs::path	src,
		fs::path	dest
	)

Rename src to dest.

Returns

true if the rename was successful.

Definition at line 249 of file fs_helpers.cpp.

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TruncateFile()

bool TruncateFile	(	FILE *	file,
		unsigned int	length
	)

Definition at line 150 of file fs_helpers.cpp.

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TryCreateDirectories()

bool TryCreateDirectories

(

const fs::path &

p

)

Ignores exceptions thrown by create_directories if the requested directory exists.

Specifically handles case where path p exists, but it wasn't possible for the user to write to the parent directory.

Definition at line 261 of file fs_helpers.cpp.

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UnlockDirectory()

void UnlockDirectory	(	const fs::path &	directory,
		const fs::path &	lockfile_name
	)

Definition at line 81 of file fs_helpers.cpp.

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Variable Documentation

cs_dir_locks

GlobalMutex cs_dir_locks

static

Mutex to protect dir_locks.

Definition at line 45 of file fs_helpers.cpp.