08-06-2007
The block sizes are important. When you write a one byte file, you do not simply consume a single byte. The file system code must allocate the smallest unit of space that it can. This varies from filesytem to filesystem. If the smallest unit is 1024 bytes, that is what du reports. After all, when you delete the one byte file, 1024 bytes will be freed. Now copy the that one byte file to another filesystem where 8192 bytes is the smallest unit that can be allocated and du now reports that.
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LEARN ABOUT CENTOS
mountpoint
MOUNTPOINT(1) User Commands MOUNTPOINT(1)
NAME
mountpoint - see if a directory is a mountpoint
SYNOPSIS
mountpoint [-q] [-d] directory
mountpoint -x device
DESCRIPTION
mountpoint checks if the directory is mentioned in the /proc/self/mountinfo file.
OPTIONS
-h, --help
Print help and exit.
-q, --quiet
Be quiet - don't print anything.
-d, --fs-devno
Print major/minor device number of the filesystem on stdout.
-x, --devno
Print major/minor device number of the blockdevice on stdout.
EXIT STATUS
Zero if the directory is a mountpoint, non-zero if not.
AUTHOR
Karel Zak <kzak@redhat.com>
ENVIRONMENT
LIBMOUNT_DEBUG=0xffff
enables debug output.
NOTES
The util-linux mountpoint implementation was written from scratch for libmount. The original version for sysvinit suite was written by
Miquel van Smoorenburg.
SEE ALSO
mount(8)
AVAILABILITY
The mountpoint command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux June 2011 MOUNTPOINT(1)