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.
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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 echo "QA output created by $seq"
29 status=1 # failure is the default!
30 trap "_cleanup; exit \$status" 0 1 2 3 15
38 # get standard environment, filters and checks
42 # only xfs supported due to use of xfs_bmap
44 _supported_os IRIX Linux
46 # real QA test starts here
49 # For this test we use block size = 1/8 page size
50 pgsize=`$here/src/feature -s`
51 blksize=`expr $pgsize / 8`
53 # Filter out file mountpoint and physical location info
55 # EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
56 # 0: [0..63]: 160..223 0 (160..223) 64
57 # 1: [64..127]: hole 64
59 # SCRATCH_MNT/testfile4: TYPE
67 sed "s#$SCRATCH_MNT#SCRATCH_MNT#g" | \
69 '$3 ~ /hole/ { print $1 "\t" $3 "\t" ($4 * 512) / blksize; next }
70 $1 ~ /^[0-9]/ { print $1 "\tblocks\t" ($6 * 512) / blksize; next }
71 $1 ~ /^SCRATCH/ { print $1; next }
72 { print $1 "\tTYPE\t" $6 }' blksize=$blksize
75 # Filter out offsets, which vary by blocksize
79 sed -e "s/^[0-9A-Fa-f ]\{7,8\}//"
84 unset XFS_MKFS_OPTIONS
85 _scratch_mkfs_xfs -b size=$blksize >/dev/null 2>&1
88 # 512b block / 4k page example:
90 #1) Write 1k of data (buffered):
94 # 2) ftruncate back to 256 bytes:
98 # 3) ftruncate out to 4k: ("H" means hole (expected))
100 # |1100|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|HHHH|
102 # So we should have 1 block of data/0, 7 blocks of holes.
104 # 4) check what's there with a direct IO read
106 # In fact what I get is 1 block of data/0, 1 block of 0's, and 7 blocks of
109 # |1100|0000|GGGG|GGGG|GGGG|GGGG|GGGG|GGGG|
111 # The garbage is in fact stale data from the disk.
113 # Check that we don't get stale data and that the hole is a hole:
116 # Write, truncate in, truncate out
118 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
119 -c "truncate `expr $blksize / 2`" \
120 -c "truncate $pgsize" \
121 -t -f $SCRATCH_MNT/testfile1 >> $seq.full
123 # directio read of entire file
125 -c "pread 0 $pgsize" \
126 -d $SCRATCH_MNT/testfile1 >> $seq.full
128 xfs_bmap -v $SCRATCH_MNT/testfile1 | _filter_bmap
129 od -x $SCRATCH_MNT/testfile1 | _filter_od
131 # Similar but write another block to create block/hole/block/hole
134 # Write, truncate in, truncate out, write to middle
136 -c "pwrite -S 0x11 -b `expr $pgsize / 2` 0 `expr $pgsize / 2`" \
137 -c "truncate `expr $blksize / 2`" \
138 -c "truncate $pgsize" \
139 -c "pwrite -S 0x22 -b $blksize `expr $blksize \* 4` $blksize" \
140 -t -f $SCRATCH_MNT/testfile2 >> $seq.full
142 # directio read of entire file
144 -c "pread 0 $pgsize" \
145 -d $SCRATCH_MNT/testfile2 >> $seq.full
147 xfs_bmap -v $SCRATCH_MNT/testfile2 | _filter_bmap
148 od -x $SCRATCH_MNT/testfile2 | _filter_od
150 # 512 byte block / 4k page example:
152 # direct write 1 page (8 blocks) of "0x11" to 0x1000
153 # map read 1 block, 512 (0x200) at 0
154 # truncate to half a block, 256 (0x100)
155 # truncate to block+1, 513 (0x201)
156 # direct write "0x22" for 1 block at offset 2048 (0x800)
158 # |1111|1111|1111|1111|1111|1111|1111|1111| Write 1's
159 # |MRMR|1111|1111|1111|1111|1111|1111|1111| mapread
160 # |11--| truncate down
161 # |1100|0---| truncate up, block+1
162 # | | |HHHH|HHHH|2222| Write 2's (extending)
165 # |1100|0000|1111|1111|2222|----|----|----| <- potential badness
167 # We're looking for this badness due to mapping over a hole:
168 # Exposes stale data from 0x400 (1024) through 0x800 (2048)
170 # 00000000 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................|
172 # 00000100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
174 # 00000400 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 |................| <- BAD
176 # 00000800 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 |""""""""""""""""|
181 # |1100|HHHH|HHHH|HHHH|2222|----|----|----|
185 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
186 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
187 -c "truncate `expr $blksize / 2`" \
188 -c "truncate `expr $blksize + 1`" \
189 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
190 -t -d -f $SCRATCH_MNT/testfile3 >> $seq.full
192 xfs_bmap -v $SCRATCH_MNT/testfile3 | _filter_bmap
193 od -x $SCRATCH_MNT/testfile3 | _filter_od
195 # Now try the same thing but write a sector in the middle of that hole
196 # If things go badly stale data will be exposed either side.
197 # This is most interesting for block size > 512 (page size > 4096)
200 # |1100|HHHH|33HH|HHHH|2222|----|----|----|
204 -c "pwrite -S 0x11 -b $pgsize 0 $pgsize" \
205 -c "mmap -r 0 $blksize" -c "mread 0 $blksize" -c "munmap" \
206 -c "truncate `expr $blksize / 2`" \
207 -c "truncate `expr $blksize + 1`" \
208 -c "pwrite -S 0x22 -b $blksize `expr $pgsize / 2` $blksize" \
209 -c "pwrite -S 0x33 -b 512 `expr $blksize \* 2` 512" \
210 -t -d -f $SCRATCH_MNT/testfile4 >> $seq.full
212 xfs_bmap -v $SCRATCH_MNT/testfile4 | _filter_bmap
213 od -x $SCRATCH_MNT/testfile4 | _filter_od