Tutorial for btrfs


 
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Operating Systems Linux Tutorial for btrfs
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Old 11-07-2010
Tutorial for btrfs

By any chance anyone knows of any tutorials available for btrfs? I am having a difficult time finding one and I thought maybe someone had a reference to one already... Smilie
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FALLOCATE(1)							   User Commands						      FALLOCATE(1)

NAME
fallocate - preallocate space to a file SYNOPSIS
fallocate [-n] [-o offset] -l length filename DESCRIPTION
fallocate is used to preallocate blocks to a file. For filesystems which support the fallocate system call, this is done quickly by allo- cating blocks and marking them as uninitialized, requiring no IO to the data blocks. This is much faster than creating a file by filling it with zeros. As of the Linux Kernel v2.6.31, the fallocate system call is supported by the btrfs, ext4, ocfs2, and xfs filesystems. The exit code returned by fallocate is 0 on success and 1 on failure. OPTIONS
The length and offset arguments may be followed by binary (2^N) suffixes KiB, MiB, GiB, TiB, PiB and EiB (the "iB" is optional, e.g. "K" has the same meaning as "KiB") or decimal (10^N) suffixes KB, MB, GB, PB and EB. -h, --help Print help and exit. -n, --keep-size Do not modify the apparent length of the file. This may effectively allocate blocks past EOF, which can be removed with a truncate. -o, --offset offset Specifies the beginning offset of the allocation, in bytes. -l, --length length Specifies the length of the allocation, in bytes. AUTHORS
Eric Sandeen <sandeen@redhat.com> Karel Zak <kzak@redhat.com> SEE ALSO
fallocate(2), posix_fallocate(3), truncate(1) AVAILABILITY
The fallocate command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux July 2009 FALLOCATE(1)