12-31-2014
Is it possible that there is an hung process that has a hold on a file that was deleted? If so the space won't be usable until there are no processes pointing to deleted files.
If you have lsof, you might be able to find a file that is still open for a process that is trying to exit.
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LEARN ABOUT DEBIAN
unlink
UNLINK(2) Linux Programmer's Manual UNLINK(2)
NAME
unlink - delete a name and possibly the file it refers to
SYNOPSIS
#include <unistd.h>
int unlink(const char *pathname);
DESCRIPTION
unlink() deletes a name from the file system. If that name was the last link to a file and no processes have the file open the file is
deleted and the space it was using is made available for reuse.
If the name was the last link to a file but any processes still have the file open the file will remain in existence until the last file
descriptor referring to it is closed.
If the name referred to a symbolic link the link is removed.
If the name referred to a socket, fifo or device the name for it is removed but processes which have the object open may continue to use
it.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EACCES Write access to the directory containing pathname is not allowed for the process's effective UID, or one of the directories in path-
name did not allow search permission. (See also path_resolution(7).)
EBUSY The file pathname cannot be unlinked because it is being used by the system or another process; for example, it is a mount point or
the NFS client software created it to represent an active but otherwise nameless inode ("NFS silly renamed").
EFAULT pathname points outside your accessible address space.
EIO An I/O error occurred.
EISDIR pathname refers to a directory. (This is the non-POSIX value returned by Linux since 2.1.132.)
ELOOP Too many symbolic links were encountered in translating pathname.
ENAMETOOLONG
pathname was too long.
ENOENT A component in pathname does not exist or is a dangling symbolic link, or pathname is empty.
ENOMEM Insufficient kernel memory was available.
ENOTDIR
A component used as a directory in pathname is not, in fact, a directory.
EPERM The system does not allow unlinking of directories, or unlinking of directories requires privileges that the calling process doesn't
have. (This is the POSIX prescribed error return; as noted above, Linux returns EISDIR for this case.)
EPERM (Linux only)
The file system does not allow unlinking of files.
EPERM or EACCES
The directory containing pathname has the sticky bit (S_ISVTX) set and the process's effective UID is neither the UID of the file to
be deleted nor that of the directory containing it, and the process is not privileged (Linux: does not have the CAP_FOWNER capabil-
ity).
EROFS pathname refers to a file on a read-only file system.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
BUGS
Infelicities in the protocol underlying NFS can cause the unexpected disappearance of files which are still being used.
SEE ALSO
rm(1), chmod(2), link(2), mknod(2), open(2), rename(2), rmdir(2), unlinkat(2), mkfifo(3), remove(3), path_resolution(7), symlink(7)
COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2011-09-15 UNLINK(2)