NFS: Run on btrfs, ext4, xfs

Testing on more filesystems increase test coverage of underlaying
filesystem on NFS server. Filesystems (tested the usual LTP way on loop
device) are used for server side (exportfs), client side (NFS mount) is
kept outside of it.

Because there are some problems with at least vfat, exfat and tmpfs (on
nfs-utils < 2) instead of testing on all available filesystems, test
just on modern Linux filesystems btrfs, ext4, xfs.

Use variables:
* TST_ALL_FILESYSTEMS=1 to run on all filesystems
* TST_FORMAT_DEVICE=1 to get loop device formatted
* TST_MOUNT_DEVICE=1 to get it mounted

For some reason umounting needs some time before NFS server stops using
underlying loop device. Also exportfs needs time before files can be
removed. Otherwise second umounting fails:

nfs07 4 TINFO: Cleaning up testcase
umount: /var/tmp/LTP_nfs07.FNZ7yCbqZe/mntpoint: target is busy.
nfs07 4 TINFO: umount(/var/tmp/LTP_nfs07.FNZ7yCbqZe/mntpoint) failed, try 1 ...
nfs07 4 TINFO: Likely gvfsd-trash is probing newly mounted  fs, kill it to speed up tests.
umount: /var/tmp/LTP_nfs07.FNZ7yCbqZe/mntpoint: target is busy.

Solved with adding sleep for 2 sec after first umount and sleeps for 1
sec after exportfs.  Second umount of the loop device in tst_test.sh
works without any extra sleep.

Link: https://lore.kernel.org/ltp/[email protected]/
Acked-by: Cyril Hrubis <[email protected]>
Signed-off-by: Petr Vorel <[email protected]>

Author: pevik

testcases/network/nfs/nfs_stress/nfs_lib.sh

@@ -28,7 +28,10 @@ NFS_PARSE_ARGS_CALLER="$TST_PARSE_ARGS"
 TST_OPTS="v:t:$TST_OPTS"
 TST_PARSE_ARGS=nfs_parse_args
 TST_USAGE=nfs_usage
-TST_NEEDS_TMPDIR=1
+TST_ALL_FILESYSTEMS=1
+TST_SKIP_FILESYSTEMS="exfat,ext2,ext3,fuse,ntfs,vfat,tmpfs"
+TST_MOUNT_DEVICE=1
+TST_FORMAT_DEVICE=1
 TST_NEEDS_ROOT=1
 TST_NEEDS_CMDS="$TST_NEEDS_CMDS mount exportfs mount.nfs"
 TST_SETUP="${TST_SETUP:-nfs_setup}"
@@ -68,7 +71,7 @@ get_remote_dir()
 	local v="$1"
 	local n="$2"
 
-	echo "$TST_TMPDIR/$v/$n"
+	echo "$TST_MNTPOINT/$v/$n"
 }
 
 nfs_get_remote_path()
@@ -210,6 +213,7 @@ nfs_cleanup()
 		grep -q "$local_dir" /proc/mounts && umount $local_dir
 		n=$(( n + 1 ))
 	done
+	sleep 2
 
 	n=0
 	for i in $VERSION; do
@@ -219,12 +223,15 @@ nfs_cleanup()
 		if tst_net_use_netns; then
 			if test -d $remote_dir; then
 				exportfs -u *:$remote_dir
+				sleep 1
 				rm -rf $remote_dir
 			fi
 		else
 			tst_rhost_run -c "test -d $remote_dir && exportfs -u *:$remote_dir"
+			sleep 1
 			tst_rhost_run -c "test -d $remote_dir && rm -rf $remote_dir"
 		fi
+
 		n=$(( n + 1 ))
 	done
 }