2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2008 Eric Sandeen. All Rights Reserved.
7 # Test mapping around/over holes for sub-page blocks
10 seqres=$RESULT_DIR/$seq
11 echo "QA output created by $seq"
15 status=1 # failure is the default!
16 trap "_cleanup; exit \$status" 0 1 2 3 15
24 # get standard environment, filters and checks
28 # only xfs supported due to use of xfs_bmap
32 # real QA test starts here
36 _scratch_mkfs_xfs >/dev/null 2>&1
38 # For this test we use block size = 1/8 page size
39 pgsize=`$here/src/feature -s`
40 blksize=`expr $pgsize / 8`
41 secsize=`_min_dio_alignment $SCRATCH_DEV`
43 if [ $secsize -gt $blksize ];then
44 _notrun "sector size($secsize) too large for platform page size($pgsize)"
47 # Filter out file mountpoint and physical location info
49 # EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
50 # 0: [0..63]: 160..223 0 (160..223) 64
51 # 1: [64..127]: hole 64
53 # SCRATCH_MNT/testfile4: TYPE
60 tee -a $seqres.full | \
61 sed "s#$SCRATCH_MNT#SCRATCH_MNT#g" | \
63 '$3 ~ /hole/ { print $1 "\t" $3 "\t" ($4 * 512) / blksize; next }
64 $1 ~ /^[0-9]/ { print $1 "\tblocks\t" ($6 * 512) / blksize; next }
65 $1 ~ /^SCRATCH/ { print $1; next }
66 { print $1 "\tTYPE\t" $6 }' blksize=$blksize
69 # Filter out offsets, which vary by blocksize
72 tee -a $seqres.full | \
73 sed -e "s/^[0-9A-Fa-f ]\{7,8\}//"
77 unset XFS_MKFS_OPTIONS
79 # we need 512 byte block size, so crc's are turned off
80 _scratch_mkfs_xfs -m crc=0 -b size=$blksize >/dev/null 2>&1
83 # 512b block / 4k page example:
85 #1) Write 1k of data (buffered):
89 # 2) ftruncate back to 256 bytes:
93 # 3) ftruncate out to 4k: ("H" means hole (expected))
95 # |1100|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|
97 # So we should have 1 block of data/0, 7 blocks of holes.
99 # 4) check what's there with a direct IO read
101 # In fact what I get is 1 block of data/0, 1 block of 0's, and 7 blocks of
104 # |1100|0000|GGGG|GGGG|GGGG|GGGG|GGGG|GGGG|
106 # The garbage is in fact stale data from the disk.
108 # Check that we don't get stale data and that the hole is a hole:
111 # Write, truncate in, truncate out
113 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
114 -c "truncate `expr $blksize / 2`" \
115 -c "truncate $pgsize" \
116 -t -f $SCRATCH_MNT/testfile1 >> $seqres.full
118 # directio read of entire file
120 -c "pread 0 $pgsize" \
121 -d $SCRATCH_MNT/testfile1 >> $seqres.full
123 xfs_bmap -v $SCRATCH_MNT/testfile1 | _filter_bmap
124 od -x $SCRATCH_MNT/testfile1 | _filter_od
126 # Similar but write another block to create block/hole/block/hole
129 # Write, truncate in, truncate out, write to middle
131 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
132 -c "truncate `expr $blksize / 2`" \
133 -c "truncate $pgsize" \
134 -c "pwrite -S 0x22 -b $blksize `expr $blksize \* 4` $blksize" \
135 -t -f $SCRATCH_MNT/testfile2 >> $seqres.full
137 # directio read of entire file
139 -c "pread 0 $pgsize" \
140 -d $SCRATCH_MNT/testfile2 >> $seqres.full
142 xfs_bmap -v $SCRATCH_MNT/testfile2 | _filter_bmap
143 od -x $SCRATCH_MNT/testfile2 | _filter_od
145 # 512 byte block / 4k page example:
147 # direct write 1 page (8 blocks) of "0x11" to 0x1000
148 # map read 1 block, 512 (0x200) at 0
149 # truncate to half a block, 256 (0x100)
150 # truncate to block+1, 513 (0x201)
151 # direct write "0x22" for 1 block at offset 2048 (0x800)
153 # |1111|1111|1111|1111|1111|1111|1111|1111| Write 1's
154 # |MRMR|1111|1111|1111|1111|1111|1111|1111| mapread
155 # |11--| truncate down
156 # |1100|0---| truncate up, block+1
157 # | | |HHHH|HHHH|2222| Write 2's (extending)
160 # |1100|0000|1111|1111|2222|----|----|----| <- potential badness
162 # We're looking for this badness due to mapping over a hole:
163 # Exposes stale data from 0x400 (1024) through 0x800 (2048)
165 # 00000000 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................|
167 # 00000100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
169 # 00000400 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................| <- BAD
171 # 00000800 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 |""""""""""""""""|
176 # |1100|HHHH|HHHH|HHHH|2222|----|----|----|
180 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
181 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
182 -c "truncate `expr $blksize / 2`" \
183 -c "truncate `expr $blksize + 1`" \
184 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
185 -t -d -f $SCRATCH_MNT/testfile3 >> $seqres.full
187 xfs_bmap -v $SCRATCH_MNT/testfile3 | _filter_bmap
188 od -x $SCRATCH_MNT/testfile3 | _filter_od
190 # Now try the same thing but write a sector in the middle of that hole
191 # If things go badly stale data will be exposed either side.
192 # This is most interesting for block size > 512 (page size > 4096)
195 # |1100|HHHH|33HH|HHHH|2222|----|----|----|
199 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
200 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
201 -c "truncate `expr $blksize / 2`" \
202 -c "truncate `expr $blksize + 1`" \
203 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
204 -c "pwrite -S 0x33 -b $secsize `expr $blksize \* 2` $secsize" \
205 -t -d -f $SCRATCH_MNT/testfile4 >> $seqres.full
207 xfs_bmap -v $SCRATCH_MNT/testfile4 | _filter_bmap
208 od -x $SCRATCH_MNT/testfile4 | _filter_od