ru.serce.jnrfuse.examples

Class MemoryFS

java.lang.Object

ru.serce.jnrfuse.AbstractFuseFS

ru.serce.jnrfuse.FuseStubFS

ru.serce.jnrfuse.examples.MemoryFS

All Implemented Interfaces:

FuseFS, Mountable

public class MemoryFS
extends FuseStubFS

Field Summary

Fields inherited from class ru.serce.jnrfuse.AbstractFuseFS

fuseOperations, libFuse, mounted, mountPoint

Constructor Summary

Constructors

Constructor and Description
MemoryFS()

Method Summary

Modifier and Type	Method and Description
int	create(java.lang.String path, long mode, FuseFileInfo fi) Create and open a file
int	getattr(java.lang.String path, FileStat stat) Get file attributes.
static void	main(java.lang.String[] args)
int	mkdir(java.lang.String path, long mode) Create a directory
int	open(java.lang.String path, FuseFileInfo fi) File open operation
int	read(java.lang.String path, jnr.ffi.Pointer buf, long size, long offset, FuseFileInfo fi) Read data from an open file
int	readdir(java.lang.String path, jnr.ffi.Pointer buf, FuseFillDir filter, long offset, FuseFileInfo fi) Read directory
int	rename(java.lang.String path, java.lang.String newName) Rename a file
int	rmdir(java.lang.String path) Remove a directory
int	statfs(java.lang.String path, Statvfs stbuf) Get file system statistics
int	truncate(java.lang.String path, long offset) Change the size of a file
int	unlink(java.lang.String path) Remove a file
int	write(java.lang.String path, jnr.ffi.Pointer buf, long size, long offset, FuseFileInfo fi) Write data to an open file

Methods inherited from class ru.serce.jnrfuse.FuseStubFS

access, bmap, chmod, chown, destroy, fallocate, fgetattr, flock, flush, fsync, fsyncdir, ftruncate, getxattr, init, ioctl, link, listxattr, lock, mknod, opendir, poll, read_buf, readlink, release, releasedir, removexattr, setxattr, symlink, utimens, write_buf

Methods inherited from class ru.serce.jnrfuse.AbstractFuseFS

getContext, getFSName, mount, umount

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ru.serce.jnrfuse.Mountable

mount, mount, mount

Constructor Detail

MemoryFS

public MemoryFS()

Method Detail

main

public static void main(java.lang.String[] args)

create

public int create(java.lang.String path,
                  long mode,
                  FuseFileInfo fi)

Description copied from interface: FuseFS

Create and open a file

If the file does not exist, first create it with the specified mode, and then open it.

If this method is not implemented or under Linux kernel versions earlier than 2.6.15, the mknod() and open() methods will be called instead.

Specified by:

create in interface FuseFS

Overrides:

create in class FuseStubFS

mode - The argument mode specifies the permissions to use in case a new file is created. See ru.serce.jnrfuse.struct.FileStat flags

getattr

public int getattr(java.lang.String path,
                   FileStat stat)

Description copied from interface: FuseFS

Get file attributes.

Similar to stat(). The 'st_dev' and 'st_blksize' fields are ignored. The 'st_ino' field is ignored except if the 'use_ino' mount option is given.

Specified by:

getattr in interface FuseFS

Overrides:

getattr in class FuseStubFS

mkdir

public int mkdir(java.lang.String path,
                 long mode)

Description copied from interface: FuseFS

Create a directory

Note that the mode argument may not have the type specification bits set, i.e. S_ISDIR(mode) can be false. To obtain the correct directory type bits use mode|S_IFDIR

Specified by:

mkdir in interface FuseFS

Overrides:

mkdir in class FuseStubFS

mode - The argument mode specifies the permissions to use in case a new file is created. @see ru.serce.jnrfuse.struct.FileStat flags

read

public int read(java.lang.String path,
                jnr.ffi.Pointer buf,
                long size,
                long offset,
                FuseFileInfo fi)

Description copied from interface: FuseFS

Read data from an open file

Read should return exactly the number of bytes requested except on EOF or error, otherwise the rest of the data will be substituted with zeroes. An exception to this is when the 'direct_io' mount option is specified, in which case the return value of the read system call will reflect the return value of this operation.

Specified by:

read in interface FuseFS

Overrides:

read in class FuseStubFS

readdir

public int readdir(java.lang.String path,
                   jnr.ffi.Pointer buf,
                   FuseFillDir filter,
                   long offset,
                   FuseFileInfo fi)

Description copied from interface: FuseFS

Read directory

This supersedes the old getdir() interface. New applications should use this.

The filesystem may choose between two modes of operation:

1) The readdir implementation ignores the offset parameter, and passes zero to the filler function's offset. The filler function will not return '1' (unless an error happens), so the whole directory is read in a single readdir operation. This works just like the old getdir() method.

2) The readdir implementation keeps track of the offsets of the directory entries. It uses the offset parameter and always passes non-zero offset to the filler function. When the buffer is full (or an error happens) the filler function will return '1'.

Specified by:

readdir in interface FuseFS

Overrides:

readdir in class FuseStubFS

statfs

public int statfs(java.lang.String path,
                  Statvfs stbuf)

Description copied from interface: FuseFS

Get file system statistics

The 'f_frsize', 'f_favail', 'f_fsid' and 'f_flag' fields are ignored

Specified by:

statfs in interface FuseFS

Overrides:

statfs in class FuseStubFS

rename

public int rename(java.lang.String path,
                  java.lang.String newName)

Description copied from interface: FuseFS

Rename a file

Specified by:

rename in interface FuseFS

Overrides:

rename in class FuseStubFS

rmdir

public int rmdir(java.lang.String path)

Description copied from interface: FuseFS

Remove a directory

Specified by:

rmdir in interface FuseFS

Overrides:

rmdir in class FuseStubFS

truncate

public int truncate(java.lang.String path,
                    long offset)

Description copied from interface: FuseFS

Change the size of a file

Specified by:

truncate in interface FuseFS

Overrides:

truncate in class FuseStubFS

unlink

public int unlink(java.lang.String path)

Description copied from interface: FuseFS

Remove a file

Specified by:

unlink in interface FuseFS

Overrides:

unlink in class FuseStubFS

open

public int open(java.lang.String path,
                FuseFileInfo fi)

Description copied from interface: FuseFS

File open operation

No creation (O_CREAT, O_EXCL) and by default also no truncation (O_TRUNC) flags will be passed to open(). If an application specifies O_TRUNC, fuse first calls truncate() and then open(). Only if 'atomic_o_trunc' has been specified and kernel version is 2.6.24 or later, O_TRUNC is passed on to open.

Unless the 'default_permissions' mount option is given, open should check if the operation is permitted for the given flags. Optionally open may also return an arbitrary filehandle in the fuse_file_info structure, which will be passed to all file operations.

Specified by:

open in interface FuseFS

Overrides:

open in class FuseStubFS

See Also:

OpenFlags

write

public int write(java.lang.String path,
                 jnr.ffi.Pointer buf,
                 long size,
                 long offset,
                 FuseFileInfo fi)

Description copied from interface: FuseFS

Write data to an open file

Write should return exactly the number of bytes requested except on error. An exception to this is when the 'direct_io' mount option is specified (see read operation).

Specified by:

write in interface FuseFS

Overrides:

write in class FuseStubFS