4 # Test Linux LVM snapshot creation
6 # The timing and placement of kills and waits is particularily sensitive.
7 # Don't change them unless you want to spend some time getting it right again.
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42 owner=freemyer@NorcrossGroup.com
45 echo "QA output created by $seq"
50 status=1 # failure is the default!
52 # Either "dd" or "fsstress" can be used to generate io load.
53 # Setting both to "FALSE" tests with no io load.
54 GENERATE_IO_LOAD_VIA_DD=TRUE
55 GENERATE_IO_LOAD_VIA_FSSTRESS=TRUE
56 DELAY_BETWEEN_ITERATIONS=10
61 SCRATCH_SNAP_MNT="$tmp/scratch_snap"
63 # Only needed if running by hand, ie. check sets these
64 #SCRATCH_LVM_DEV=/dev/xxxx
69 echo Cleanup beginning
72 xfs_freeze -u "$SCRATCH_MNT"
74 sleep 10 # Give the dd loop time to finish
76 # Comment out unless needed.
77 # If needed, wrap with logic to ensure the FS is mounted.
78 # Kill off any other possible stray stragglers that may be out there.
79 # There should not be any.
80 #fuser -k -m "$SCRATCH_SNAP_MNT/dummy" >/dev/null 2>&1
81 #fuser -k -m "$SCRATCH_MNT/dummy" >/dev/null 2>&1
85 umount "$SCRATCH_SNAP_MNT" > /dev/null 2>&1
86 rmdir "$SCRATCH_SNAP_MNT" > /dev/null 2>&1
87 umount "$SCRATCH_MNT" > /dev/null 2>&1
89 lvremove -f "$VG/scratch_snap" > /dev/null 2>&1
90 lvremove -f "$VG/scratch" > /dev/null 2>&1
94 rm -rf "$tmp" # if we ever use tmp files
99 trap "_cleanup" 0 1 2 3 15
102 # get standard environment, filters and checks
106 # real QA test starts here
110 if [ -e "$SCRATCH_SNAP_MNT" ]; then
111 rmdir "$SCRATCH_SNAP_MNT" || _notrun "Cannot rmdir $SCRATCH_SNAP_MNT"
113 mkdir "$SCRATCH_SNAP_MNT"
115 #Verify we have the lvm user tools
116 [ -x /sbin/lvcreate ] || _notrun "lvcreate utility is not installed in /sbin"
117 [ -x /sbin/lvremove ] || _notrun "lvremove utility is not installed in /sbin"
119 # If the above fails for LVM 2, the below may be useful notes
120 # try "lvm vgdisplay --version" and look for a > 1.9x version number, eg,
122 # LVM version: 1.95.10-cvs (2002-05-31)
123 # Library version: 0.96.03-ioctl-cvs (2002-06-27)
124 # Driver version: 1.0.3
129 # Check if LVM 1 is in the kernel
130 if grep lvm /proc/devices > /dev/null; then LVM=true; fi
132 # Check if LVM 2 is in the kernel
133 if grep device-mapper /proc/devices > /dev/null; then LVM=true; fi
135 # Check if EVMS is in the kernel
136 #TODO # I don't know how to do this one.
138 [ "$LVM" = false ] && _notrun "LVM is not present in the running kernel."
141 # Create a PV set from the scratch partition
142 #TODO # (I don't know if this is needed.and it is dangerous because it intentionally deletes the partition table!!!
143 #TODO # dd if=/dev/zero of="$SCRATCH_LVM_DEV" bs=512 count=1
144 #TODO # pvcreate "$SCRATCH_LVM_DEV"
146 # Create a VG from the PV
147 #TODO # vgcreate "$VG" "$SCRATCH_LVM_DEV"
149 # Create a LV in the VG to snapshot
150 #TODO # lvcreate -L 2G -n scratch "$VG"
155 mount "$VG/scratch" "$SCRATCH_MNT"
159 if [ "$GENERATE_IO_LOAD_VIA_DD" != FALSE ]
161 # Create a large 64 Meg zero filled file on the LV
162 dd if=/dev/zero of=$SCRATCH_MNT/dummy bs=64k count=1000 >/dev/null 2>&1
164 # Setup infinite loop copying the large file, thus generating heavy I/O
166 while [ -f "$tmp/running" ]
168 dd if="$SCRATCH_MNT/dummy" of="$SCRATCH_MNT/junk" bs=64k \
170 # This forces metadata updates the next time around
171 rm "$SCRATCH_MNT/junk"
176 if [ "$GENERATE_IO_LOAD_VIA_FSSTRESS" != FALSE ]
178 STRESS_DIR="$SCRATCH_MNT/fsstress_test_dir"
181 while [ -f "$tmp/running" ]
183 # -n 10 makes this take about 10 seconds,
184 # This allows the loop to end shortly after $tmp/running
186 $here/ltp/fsstress -d "$STRESS_DIR" -n 10 > /dev/null 2>&1
195 while [ $ii -le "$ITERATIONS" ]
198 # Useful if running interactively, but not from the xfs test scripts
201 # If the VFS lock patch is present, the calls to xfs_freeze
202 # are redundant, but should cause no problems
204 xfs_freeze -f "$SCRATCH_MNT"
205 [ $? != 0 ] && echo xfs_freeze -f "$SCRATCH_MNT" failed
207 lvcreate --snapshot --size 1G --name scratch_snap "$VG/scratch"\
211 echo "Snapshot $SCRATCH_MNT create failed, status=$ret"
213 SNAPSHOT_shell_pid=$!
215 # If the Snapshot has not completed in ten minutes, kill it
217 # I have NOT figured out how to kill the sleep 600 before
218 # it exits naturally.
219 # This does not cause a problem, but it clutters the ps table.
222 # The kill $TIMEOUT_shell_pid keeps the below from occuring
223 echo Snapshot Lockup Occured on loop $ii
224 xfs_freeze -u "$SCRATCH_MNT"
229 wait "$SNAPSHOT_shell_pid"
231 exec 2> /dev/null # Send the shells stderr to /dev/null
232 kill "$TIMEOUT_shell_pid" # Cancel the timeout
233 wait "$TIMEOUT_shell_pid" # This causes consistent shell
234 # notification for some unknown reason
235 exec 2>&1 # Put it back to the same as stdout
237 # If the VFS lock patch is present, the calls to xfs_freeze
238 # are redundant, but should cause no problems
240 xfs_freeze -u "$SCRATCH_MNT"
241 [ $? != 0 ] && echo xfs_freeze -u "$SCRATCH_MNT" failed
244 mount -t xfs -o ro,nouuid "$VG/scratch_snap" "$SCRATCH_SNAP_MNT"
245 [ $? -eq 0 ] || echo mount for "$SCRATCH_SNAP_MNT" failed
247 umount "$SCRATCH_SNAP_MNT"
248 [ $? -eq 0 ] || echo umount for "$SCRATCH_SNAP_MNT" failed
250 lvremove -f "$VG/scratch_snap" > /dev/null 2>&1
251 [ $? -eq 0 ] || echo lvremove for "$VG/scratch_snap" failed
255 sleep "$DELAY_BETWEEN_ITERATIONS"
256 # The VG seems to need time to stabalize between snapshots
257 # With LVM 1.0.3 and XFS 1.1, I have tried this at 3600 seconds
258 # and still had failures
263 echo SUCCESS, COMPLETED ALL ITERATIONS WITH NO TIME OUTS!!!!!!!!!!!!
266 exit 1 # _cleanup should exit, so we should never get here.