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 $seq"
15 status=1 # failure is the default!
16 trap "_cleanup; exit \$status" 0 1 2 3 15
21 # Unmount the V4 filesystem we forcibly created to run this test so that
22 # the post-test wrapup checks won't try to remount the filesystem with
23 # different MOUNT_OPTIONS (specifically, the ones that get screened out by
24 # _force_xfsv4_mount_options) and fail.
29 # get standard environment, filters and checks
33 # only xfs supported due to use of xfs_bmap
36 # real QA test starts here
40 _scratch_mkfs_xfs >/dev/null 2>&1
42 # For this test we use block size = 1/8 page size
43 pgsize=`$here/src/feature -s`
44 blksize=`expr $pgsize / 8`
45 secsize=`_min_dio_alignment $SCRATCH_DEV`
47 if [ $secsize -gt $blksize ];then
48 _notrun "sector size($secsize) too large for platform page size($pgsize)"
51 # Filter out file mountpoint and physical location info
53 # EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
54 # 0: [0..63]: 160..223 0 (160..223) 64
55 # 1: [64..127]: hole 64
57 # SCRATCH_MNT/testfile4: TYPE
64 tee -a $seqres.full | \
65 sed "s#$SCRATCH_MNT#SCRATCH_MNT#g" | \
67 '$3 ~ /hole/ { print $1 "\t" $3 "\t" ($4 * 512) / blksize; next }
68 $1 ~ /^[0-9]/ { print $1 "\tblocks\t" ($6 * 512) / blksize; next }
69 $1 ~ /^SCRATCH/ { print $1; next }
70 { print $1 "\tTYPE\t" $6 }' blksize=$blksize
73 # Filter out offsets, which vary by blocksize
76 tee -a $seqres.full | \
77 sed -e "s/^[0-9A-Fa-f ]\{7,8\}//"
81 unset XFS_MKFS_OPTIONS
83 # we need 512 byte block size, so crc's are turned off
84 _scratch_mkfs_xfs -m crc=0 -b size=$blksize >/dev/null 2>&1
86 test "$(_get_block_size $SCRATCH_MNT)" = $blksize || \
87 _notrun "Could not get $blksize-byte blocks"
90 # 512b block / 4k page example:
92 #1) Write 1k of data (buffered):
96 # 2) ftruncate back to 256 bytes:
100 # 3) ftruncate out to 4k: ("H" means hole (expected))
102 # |1100|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|
104 # So we should have 1 block of data/0, 7 blocks of holes.
106 # 4) check what's there with a direct IO read
108 # In fact what I get is 1 block of data/0, 1 block of 0's, and 7 blocks of
111 # |1100|0000|GGGG|GGGG|GGGG|GGGG|GGGG|GGGG|
113 # The garbage is in fact stale data from the disk.
115 # Check that we don't get stale data and that the hole is a hole:
118 # Write, truncate in, truncate out
120 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
121 -c "truncate `expr $blksize / 2`" \
122 -c "truncate $pgsize" \
123 -t -f $SCRATCH_MNT/testfile1 >> $seqres.full
125 # directio read of entire file
127 -c "pread 0 $pgsize" \
128 -d $SCRATCH_MNT/testfile1 >> $seqres.full
130 xfs_bmap -v $SCRATCH_MNT/testfile1 | _filter_bmap
131 od -x $SCRATCH_MNT/testfile1 | _filter_od
133 # Similar but write another block to create block/hole/block/hole
136 # Write, truncate in, truncate out, write to middle
138 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
139 -c "truncate `expr $blksize / 2`" \
140 -c "truncate $pgsize" \
141 -c "pwrite -S 0x22 -b $blksize `expr $blksize \* 4` $blksize" \
142 -t -f $SCRATCH_MNT/testfile2 >> $seqres.full
144 # directio read of entire file
146 -c "pread 0 $pgsize" \
147 -d $SCRATCH_MNT/testfile2 >> $seqres.full
149 xfs_bmap -v $SCRATCH_MNT/testfile2 | _filter_bmap
150 od -x $SCRATCH_MNT/testfile2 | _filter_od
152 # 512 byte block / 4k page example:
154 # direct write 1 page (8 blocks) of "0x11" to 0x1000
155 # map read 1 block, 512 (0x200) at 0
156 # truncate to half a block, 256 (0x100)
157 # truncate to block+1, 513 (0x201)
158 # direct write "0x22" for 1 block at offset 2048 (0x800)
160 # |1111|1111|1111|1111|1111|1111|1111|1111| Write 1's
161 # |MRMR|1111|1111|1111|1111|1111|1111|1111| mapread
162 # |11--| truncate down
163 # |1100|0---| truncate up, block+1
164 # | | |HHHH|HHHH|2222| Write 2's (extending)
167 # |1100|0000|1111|1111|2222|----|----|----| <- potential badness
169 # We're looking for this badness due to mapping over a hole:
170 # Exposes stale data from 0x400 (1024) through 0x800 (2048)
172 # 00000000 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................|
174 # 00000100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
176 # 00000400 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................| <- BAD
178 # 00000800 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 |""""""""""""""""|
183 # |1100|HHHH|HHHH|HHHH|2222|----|----|----|
187 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
188 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
189 -c "truncate `expr $blksize / 2`" \
190 -c "truncate `expr $blksize + 1`" \
191 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
192 -t -d -f $SCRATCH_MNT/testfile3 >> $seqres.full
194 xfs_bmap -v $SCRATCH_MNT/testfile3 | _filter_bmap
195 od -x $SCRATCH_MNT/testfile3 | _filter_od
197 # Now try the same thing but write a sector in the middle of that hole
198 # If things go badly stale data will be exposed either side.
199 # This is most interesting for block size > 512 (page size > 4096)
202 # |1100|HHHH|33HH|HHHH|2222|----|----|----|
206 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
207 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
208 -c "truncate `expr $blksize / 2`" \
209 -c "truncate `expr $blksize + 1`" \
210 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
211 -c "pwrite -S 0x33 -b $secsize `expr $blksize \* 2` $secsize" \
212 -t -d -f $SCRATCH_MNT/testfile4 >> $seqres.full
214 xfs_bmap -v $SCRATCH_MNT/testfile4 | _filter_bmap
215 od -x $SCRATCH_MNT/testfile4 | _filter_od