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 seqres=$RESULT_DIR/$seq
27 seqres=$RESULT_DIR/$seq
28 echo "QA output created by $seq"
32 status=1 # failure is the default!
33 trap "_cleanup; exit \$status" 0 1 2 3 15
41 # get standard environment, filters and checks
45 # only xfs supported due to use of xfs_bmap
47 _supported_os IRIX Linux
49 # real QA test starts here
52 # For this test we use block size = 1/8 page size
53 pgsize=`$here/src/feature -s`
54 blksize=`expr $pgsize / 8`
56 # Filter out file mountpoint and physical location info
58 # EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
59 # 0: [0..63]: 160..223 0 (160..223) 64
60 # 1: [64..127]: hole 64
62 # SCRATCH_MNT/testfile4: TYPE
69 tee -a $seqres.full | \
70 sed "s#$SCRATCH_MNT#SCRATCH_MNT#g" | \
72 '$3 ~ /hole/ { print $1 "\t" $3 "\t" ($4 * 512) / blksize; next }
73 $1 ~ /^[0-9]/ { print $1 "\tblocks\t" ($6 * 512) / blksize; next }
74 $1 ~ /^SCRATCH/ { print $1; next }
75 { print $1 "\tTYPE\t" $6 }' blksize=$blksize
78 # Filter out offsets, which vary by blocksize
81 tee -a $seqres.full | \
82 sed -e "s/^[0-9A-Fa-f ]\{7,8\}//"
87 unset XFS_MKFS_OPTIONS
88 _scratch_mkfs_xfs -b size=$blksize >/dev/null 2>&1
91 # 512b block / 4k page example:
93 #1) Write 1k of data (buffered):
97 # 2) ftruncate back to 256 bytes:
101 # 3) ftruncate out to 4k: ("H" means hole (expected))
103 # |1100|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|
105 # So we should have 1 block of data/0, 7 blocks of holes.
107 # 4) check what's there with a direct IO read
109 # In fact what I get is 1 block of data/0, 1 block of 0's, and 7 blocks of
112 # |1100|0000|GGGG|GGGG|GGGG|GGGG|GGGG|GGGG|
114 # The garbage is in fact stale data from the disk.
116 # Check that we don't get stale data and that the hole is a hole:
119 # Write, truncate in, truncate out
121 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
122 -c "truncate `expr $blksize / 2`" \
123 -c "truncate $pgsize" \
124 -t -f $SCRATCH_MNT/testfile1 >> $seqres.full
126 # directio read of entire file
128 -c "pread 0 $pgsize" \
129 -d $SCRATCH_MNT/testfile1 >> $seqres.full
131 xfs_bmap -v $SCRATCH_MNT/testfile1 | _filter_bmap
132 od -x $SCRATCH_MNT/testfile1 | _filter_od
134 # Similar but write another block to create block/hole/block/hole
137 # Write, truncate in, truncate out, write to middle
139 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
140 -c "truncate `expr $blksize / 2`" \
141 -c "truncate $pgsize" \
142 -c "pwrite -S 0x22 -b $blksize `expr $blksize \* 4` $blksize" \
143 -t -f $SCRATCH_MNT/testfile2 >> $seqres.full
145 # directio read of entire file
147 -c "pread 0 $pgsize" \
148 -d $SCRATCH_MNT/testfile2 >> $seqres.full
150 xfs_bmap -v $SCRATCH_MNT/testfile2 | _filter_bmap
151 od -x $SCRATCH_MNT/testfile2 | _filter_od
153 # 512 byte block / 4k page example:
155 # direct write 1 page (8 blocks) of "0x11" to 0x1000
156 # map read 1 block, 512 (0x200) at 0
157 # truncate to half a block, 256 (0x100)
158 # truncate to block+1, 513 (0x201)
159 # direct write "0x22" for 1 block at offset 2048 (0x800)
161 # |1111|1111|1111|1111|1111|1111|1111|1111| Write 1's
162 # |MRMR|1111|1111|1111|1111|1111|1111|1111| mapread
163 # |11--| truncate down
164 # |1100|0---| truncate up, block+1
165 # | | |HHHH|HHHH|2222| Write 2's (extending)
168 # |1100|0000|1111|1111|2222|----|----|----| <- potential badness
170 # We're looking for this badness due to mapping over a hole:
171 # Exposes stale data from 0x400 (1024) through 0x800 (2048)
173 # 00000000 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................|
175 # 00000100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
177 # 00000400 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................| <- BAD
179 # 00000800 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 |""""""""""""""""|
184 # |1100|HHHH|HHHH|HHHH|2222|----|----|----|
188 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
189 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
190 -c "truncate `expr $blksize / 2`" \
191 -c "truncate `expr $blksize + 1`" \
192 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
193 -t -d -f $SCRATCH_MNT/testfile3 >> $seqres.full
195 xfs_bmap -v $SCRATCH_MNT/testfile3 | _filter_bmap
196 od -x $SCRATCH_MNT/testfile3 | _filter_od
198 # Now try the same thing but write a sector in the middle of that hole
199 # If things go badly stale data will be exposed either side.
200 # This is most interesting for block size > 512 (page size > 4096)
203 # |1100|HHHH|33HH|HHHH|2222|----|----|----|
207 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
208 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
209 -c "truncate `expr $blksize / 2`" \
210 -c "truncate `expr $blksize + 1`" \
211 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
212 -c "pwrite -S 0x33 -b 512 `expr $blksize \* 2` 512" \
213 -t -d -f $SCRATCH_MNT/testfile4 >> $seqres.full
215 xfs_bmap -v $SCRATCH_MNT/testfile4 | _filter_bmap
216 od -x $SCRATCH_MNT/testfile4 | _filter_od