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xfs: test inode allocation with fragmented free space

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XFS dynamic inode allocation has a fundamental limitation in that an
inode chunk requires a contiguous extent of a minimum size. Depending on
the level of free space fragmentation, inode allocation can fail with
ENOSPC where the filesystem might not be near 100% usage.

The sparse inodes feature was implemented to provide an inode allocation
strategy that maximizes the ability to allocate inodes under free space
fragmentation. This test fragments free space and verifies that
filesystems that support sparse inode allocation can allocate a minimum
percentage of inodes on the fs.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Brian Foster
2015-08-04 14:10:48 +10:00
committed by Dave Chinner
parent 4273348818
commit 46e088e7be
4 changed files with 170 additions and 0 deletions
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common/rc
+37
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@@ -1449,6 +1449,18 @@ _require_xfs_sysfs()
fi
}
# this test requires the xfs sparse inode feature
#
_require_xfs_sparse_inodes()
{
_scratch_mkfs_xfs_supported -m crc=1 -i sparse > /dev/null 2>&1 \
|| _notrun "mkfs.xfs does not support sparse inodes"
_scratch_mkfs_xfs -m crc=1 -i sparse > /dev/null 2>&1
_scratch_mount >/dev/null 2>&1 \
|| _notrun "kernel does not support sparse inodes"
umount $SCRATCH_MNT
}
# this test requires that external log/realtime devices are not in use
#
_require_nonexternal()
@@ -2724,6 +2736,18 @@ _get_used_inode()
echo $nr_inode
}
_get_used_inode_percent()
{
if [ -z "$1" ]; then
echo "Usage: _get_used_inode_percent <mnt>"
exit 1
fi
local pct_inode;
pct_inode=`$DF_PROG -i $1 | tail -1 | awk '{ print $6 }' | \
sed -e 's/%//'`
echo $pct_inode
}
_get_free_inode()
{
if [ -z "$1" ]; then
@@ -2735,6 +2759,19 @@ _get_free_inode()
echo $nr_inode
}
# get the available space in bytes
#
_get_available_space()
{
if [ -z "$1" ]; then
echo "Usage: _get_available_space <mnt>"
exit 1
fi
local avail_kb;
avail_kb=`$DF_PROG $1 | tail -n1 | awk '{ print $5 }'`
echo $((avail_kb * 1024))
}
# get btrfs profile configs being tested
#
# A set of pre-set profile configs are exported via _btrfs_profile_configs