4 # Test mapping around/over holes for sub-page blocks
6 #-----------------------------------------------------------------------
7 # Copyright (c) 2008 Eric Sandeen. All Rights Reserved.
9 # This program is free software; you can redistribute it and/or
10 # modify it under the terms of the GNU General Public License as
11 # published by the Free Software Foundation.
13 # This program is distributed in the hope that it would be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write the Free Software Foundation,
20 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #-----------------------------------------------------------------------
25 seqres=$RESULT_DIR/$seq
26 echo "QA output created by $seq"
30 status=1 # failure is the default!
31 trap "_cleanup; exit \$status" 0 1 2 3 15
39 # get standard environment, filters and checks
43 # only xfs supported due to use of xfs_bmap
45 _supported_os IRIX Linux
47 # real QA test starts here
50 # For this test we use block size = 1/8 page size
51 pgsize=`$here/src/feature -s`
52 blksize=`expr $pgsize / 8`
53 secsize=`_min_dio_alignment $SCRATCH_DEV`
55 if [ $secsize -gt $blksize ];then
56 _notrun "sector size($secsize) too large for platform page size($pgsize)"
59 # Filter out file mountpoint and physical location info
61 # EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
62 # 0: [0..63]: 160..223 0 (160..223) 64
63 # 1: [64..127]: hole 64
65 # SCRATCH_MNT/testfile4: TYPE
72 tee -a $seqres.full | \
73 sed "s#$SCRATCH_MNT#SCRATCH_MNT#g" | \
75 '$3 ~ /hole/ { print $1 "\t" $3 "\t" ($4 * 512) / blksize; next }
76 $1 ~ /^[0-9]/ { print $1 "\tblocks\t" ($6 * 512) / blksize; next }
77 $1 ~ /^SCRATCH/ { print $1; next }
78 { print $1 "\tTYPE\t" $6 }' blksize=$blksize
81 # Filter out offsets, which vary by blocksize
84 tee -a $seqres.full | \
85 sed -e "s/^[0-9A-Fa-f ]\{7,8\}//"
90 unset XFS_MKFS_OPTIONS
92 # we need 512 byte block size, so crc's are turned off
93 _scratch_mkfs_xfs -m crc=0 -b size=$blksize >/dev/null 2>&1
96 # 512b block / 4k page example:
98 #1) Write 1k of data (buffered):
102 # 2) ftruncate back to 256 bytes:
106 # 3) ftruncate out to 4k: ("H" means hole (expected))
108 # |1100|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|
110 # So we should have 1 block of data/0, 7 blocks of holes.
112 # 4) check what's there with a direct IO read
114 # In fact what I get is 1 block of data/0, 1 block of 0's, and 7 blocks of
117 # |1100|0000|GGGG|GGGG|GGGG|GGGG|GGGG|GGGG|
119 # The garbage is in fact stale data from the disk.
121 # Check that we don't get stale data and that the hole is a hole:
124 # Write, truncate in, truncate out
126 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
127 -c "truncate `expr $blksize / 2`" \
128 -c "truncate $pgsize" \
129 -t -f $SCRATCH_MNT/testfile1 >> $seqres.full
131 # directio read of entire file
133 -c "pread 0 $pgsize" \
134 -d $SCRATCH_MNT/testfile1 >> $seqres.full
136 xfs_bmap -v $SCRATCH_MNT/testfile1 | _filter_bmap
137 od -x $SCRATCH_MNT/testfile1 | _filter_od
139 # Similar but write another block to create block/hole/block/hole
142 # Write, truncate in, truncate out, write to middle
144 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
145 -c "truncate `expr $blksize / 2`" \
146 -c "truncate $pgsize" \
147 -c "pwrite -S 0x22 -b $blksize `expr $blksize \* 4` $blksize" \
148 -t -f $SCRATCH_MNT/testfile2 >> $seqres.full
150 # directio read of entire file
152 -c "pread 0 $pgsize" \
153 -d $SCRATCH_MNT/testfile2 >> $seqres.full
155 xfs_bmap -v $SCRATCH_MNT/testfile2 | _filter_bmap
156 od -x $SCRATCH_MNT/testfile2 | _filter_od
158 # 512 byte block / 4k page example:
160 # direct write 1 page (8 blocks) of "0x11" to 0x1000
161 # map read 1 block, 512 (0x200) at 0
162 # truncate to half a block, 256 (0x100)
163 # truncate to block+1, 513 (0x201)
164 # direct write "0x22" for 1 block at offset 2048 (0x800)
166 # |1111|1111|1111|1111|1111|1111|1111|1111| Write 1's
167 # |MRMR|1111|1111|1111|1111|1111|1111|1111| mapread
168 # |11--| truncate down
169 # |1100|0---| truncate up, block+1
170 # | | |HHHH|HHHH|2222| Write 2's (extending)
173 # |1100|0000|1111|1111|2222|----|----|----| <- potential badness
175 # We're looking for this badness due to mapping over a hole:
176 # Exposes stale data from 0x400 (1024) through 0x800 (2048)
178 # 00000000 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................|
180 # 00000100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
182 # 00000400 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................| <- BAD
184 # 00000800 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 |""""""""""""""""|
189 # |1100|HHHH|HHHH|HHHH|2222|----|----|----|
193 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
194 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
195 -c "truncate `expr $blksize / 2`" \
196 -c "truncate `expr $blksize + 1`" \
197 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
198 -t -d -f $SCRATCH_MNT/testfile3 >> $seqres.full
200 xfs_bmap -v $SCRATCH_MNT/testfile3 | _filter_bmap
201 od -x $SCRATCH_MNT/testfile3 | _filter_od
203 # Now try the same thing but write a sector in the middle of that hole
204 # If things go badly stale data will be exposed either side.
205 # This is most interesting for block size > 512 (page size > 4096)
208 # |1100|HHHH|33HH|HHHH|2222|----|----|----|
212 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
213 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
214 -c "truncate `expr $blksize / 2`" \
215 -c "truncate `expr $blksize + 1`" \
216 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
217 -c "pwrite -S 0x33 -b $secsize `expr $blksize \* 2` $secsize" \
218 -t -d -f $SCRATCH_MNT/testfile4 >> $seqres.full
220 xfs_bmap -v $SCRATCH_MNT/testfile4 | _filter_bmap
221 od -x $SCRATCH_MNT/testfile4 | _filter_od