VFS_FILEID(8) System Administration tools VFS_FILEID(8)NAME
vfs_fileid - Generates file_id structs with unique device id values for cluster setups
SYNOPSIS
vfs objects = fileid
DESCRIPTION
This VFS module is part of the samba(7) suite.
Samba uses file_id structs to uniquely identify files for locking purpose. By default the file_id contains the device and inode number
returned by the stat() system call. As the file_id is a unique identifier of a file, it must be the same on all nodes in a cluster setup.
This module overloads the SMB_VFS_FILE_ID_CREATE() operation and generates the device number based on the configured algorithm (see the
"fileid:algorithm" option).
OPTIONS
fileid:algorithm = ALGORITHM
Available algorithms are fsname and fsid. The default value is fsname.
The fsname algorithm generates device id by hashing the kernel device name.
The fsid algorithm generates the device id from the f_fsid returned from the statfs() syscall.
fileid:mapping = ALGORITHM
This option is the legacy version of the fileid:algorithm option, which was used in earlier versions of fileid mapping feature in
custom Samba 3.0 versions.
EXAMPLES
Usage of the fileid module with the fsid algorithm:
[global]
vfs objects = fileid
fileid:algorithm = fsid
VERSION
This man page is correct for version 3.2 of the Samba suite.
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
Samba 4.0 06/17/2014 VFS_FILEID(8)
Check Out this Related Man Page
VFS_AIO_FORK(8) System Administration tools VFS_AIO_FORK(8)NAME
vfs_aio_fork - implement async I/O in Samba vfs
SYNOPSIS
vfs objects = aio_fork
DESCRIPTION
This VFS module is part of the samba(7) suite.
The aio_fork VFS module enables async I/O for Samba on platforms where the system level Posix AIO interface is insufficient. Posix AIO can
suffer from severe limitations. For example, on some Linux versions the real-time signals that it uses are broken under heavy load. Other
systems only allow AIO when special kernel modules are loaded or only allow a certain system-wide amount of async requests being scheduled.
Systems based on glibc (most Linux systems) only allow a single outstanding request per file descriptor.
To work around all these limitations, the aio_fork module was written. It uses forked helper processes instead of the internal Posix AIO
interface to create asynchronousity for read and write calls. It has no parameters, it will create helper processes when async requests
come in as needed. Idle helper processes will be removed every 30 seconds.
This module is stackable.
EXAMPLES
Straight forward use:
[cooldata]
path = /data/ice
vfs objects = aio_fork
VERSION
This man page is correct for version 4.0.0 of the Samba suite.
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
Samba 4.0 06/17/2014 VFS_AIO_FORK(8)
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