https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223015
Bug ID: 223015
Summary: [tmpfs] tmpfs does not support sparse files
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: kwh...@site.uottawa.ca
When attempting to create a large sparse file on a tmpfs file system, I get
this message: "truncate: ... No space left on device"
It appears to work on a similarly sized mfs file system.
...keith
Sample test script output:
# sh t_tmpfs
=== tmpfs ===
truncate: /tmp/_trunc_/sparse: No space left on device
0 -rw-r--r-- 1 root wheel 0 Oct 14 17:24 /tmp/_trunc_/sparse
=== mfs ===
96 -rw-r--r-- 1 root wheel 2147483648 Oct 14 17:24 /tmp/_trunc_/sparse
Test script follows:
#!/bin/sh
#
DIR=/tmp/_trunc_
TUNIT=101
TFILE=sparse
SSIZE=16m
TSIZE=2g
exec 2>&1
mkdir $DIR || exit 1
echo "=== tmpfs ==="
mount -t tmpfs -osize=$SSIZE /tmp $DIR
truncate -s$TSIZE $DIR/$TFILE
ls -ls $DIR/$TFILE
umount $DIR
echo "=== mfs ==="
mount -t mfs -o-s=$SSIZE md$TUNIT $DIR
truncate -s$TSIZE $DIR/$TFILE
ls -ls $DIR/$TFILE
umount $DIR
mdconfig -du $TUNIT
rmdir $DIR
exit 0
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