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fsx: add support for writing constant instead of random data

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-g X: write character X instead of random generated data

This is useful to compare holes between good and bad files
because hexdump of good and bad files compacts the contigious
ranges of X and zeroes.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Amir Goldstein
2017-09-07 10:26:37 +03:00
committed by Eryu Guan
parent 3f742550df
commit 90d0b3e166
1 changed files with 14 additions and 5 deletions
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ltp/fsx.c
+14 -5
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@@ -133,6 +133,7 @@ unsigned long simulatedopcount = 0; /* -b flag */
int closeprob = 0; /* -c flag */
int debug = 0; /* -d flag */
unsigned long debugstart = 0; /* -D flag */
char filldata = 0; /* -g flag */
int flush = 0; /* -f flag */
int do_fsync = 0; /* -y flag */
unsigned long maxfilelen = 256 * 1024; /* -l flag */
@@ -813,9 +814,13 @@ void
gendata(char *original_buf, char *good_buf, unsigned offset, unsigned size)
{
while (size--) {
good_buf[offset] = testcalls % 256;
if (offset % 2)
good_buf[offset] += original_buf[offset];
if (filldata) {
good_buf[offset] = filldata;
} else {
good_buf[offset] = testcalls % 256;
if (offset % 2)
good_buf[offset] += original_buf[offset];
}
offset++;
}
}
@@ -1630,11 +1635,12 @@ void
usage(void)
{
fprintf(stdout, "usage: %s",
"fsx [-dnqxAFLOWZ] [-b opnum] [-c Prob] [-i logdev] [-j logid] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-D startingop] [-N numops] [-P dirpath] [-S seed] fname\n\
"fsx [-dnqxAFLOWZ] [-b opnum] [-c Prob] [-g filldata] [-i logdev] [-j logid] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-D startingop] [-N numops] [-P dirpath] [-S seed] fname\n\
-b opnum: beginning operation number (default 1)\n\
-c P: 1 in P chance of file close+open at each op (default infinity)\n\
-d: debug output for all operations\n\
-f flush and invalidate cache after I/O\n\
-g X: write character X instead of random generated data\n\
-i logdev: do integrity testing, logdev is the dm log writes device\n\
-j logid: prefix debug log messsages with this id\n\
-l flen: the upper bound on file size (default 262144)\n\
@@ -1872,7 +1878,7 @@ main(int argc, char **argv)
setvbuf(stdout, (char *)0, _IOLBF, 0); /* line buffered stdout */
while ((ch = getopt_long(argc, argv,
"b:c:dfi:j:l:m:no:p:qr:s:t:w:xyAD:FKHzCILN:OP:RS:WZ",
"b:c:dfg:i:j:l:m:no:p:qr:s:t:w:xyAD:FKHzCILN:OP:RS:WZ",
longopts, NULL)) != EOF)
switch (ch) {
case 'b':
@@ -1896,6 +1902,9 @@ main(int argc, char **argv)
case 'f':
flush = 1;
break;
case 'g':
filldata = *optarg;
break;
case 'i':
integrity = 1;
logdev = strdup(optarg);