On 2011-02-28, at 10:32 AM, Eric Sandeen wrote:
> (Sending one more time, hoping for a real reviewed-by) :)
>
> Add random runtime fallocate calls to fsx (vs. the existing
> preallocate file at start of run).
Sorry, don't have a chance to look at this today, but just for reference here is the patched fsx that I have. I have never tested the fallocate support in my version (when I was merging your patch the kernel I was testing on didn't have it), so it may be patched incorrectly, but I thought you may be interested in the other changes.
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
>
> diff --git a/aclocal.m4 b/aclocal.m4
> index 6457d39..70ea0f3 100644
> --- a/aclocal.m4
> +++ b/aclocal.m4
> @@ -18,6 +18,17 @@ AC_DEFUN([AC_PACKAGE_WANT_LINUX_FIEMAP_H],
>
> AC_DEFUN([AC_PACKAGE_WANT_FALLOCATE],
> [ AC_MSG_CHECKING([for fallocate])
> + AC_TRY_COMPILE([
> +#include <linux/falloc.h>
> + ], [
> + fallocate(0, 0, 0, 0);
> + ], have_fallocate=true
> + AC_MSG_RESULT(true),
> + AC_MSG_RESULT(false))
> + AC_SUBST(have_fallocate)
> + ])
> +AC_DEFUN([AC_PACKAGE_WANT_FALLOCATE],
> + [ AC_MSG_CHECKING([for fallocate])
> AC_TRY_LINK([
> #define _GNU_SOURCE
> #define _FILE_OFFSET_BITS 64
> diff --git a/include/builddefs.in b/include/builddefs.in
> index 3bea050..0d51715 100644
> --- a/include/builddefs.in
> +++ b/include/builddefs.in
> @@ -58,6 +58,7 @@ RPM_VERSION = @rpm_version@
> ENABLE_SHARED = @enable_shared@
> HAVE_DB = @have_db@
> HAVE_AIO = @have_aio@
> +HAVE_FALLOCATE = @have_fallocate@
> HAVE_DMAPI = @have_dmapi@
> HAVE_ATTR_LIST = @have_attr_list@
> HAVE_FIEMAP = @have_fiemap@
> diff --git a/ltp/Makefile b/ltp/Makefile
> index d74a9df..f3899e1 100644
> --- a/ltp/Makefile
> +++ b/ltp/Makefile
> @@ -27,6 +27,10 @@ LCFLAGS += -DAIO
> LLDLIBS += -laio -lpthread
> endif
>
> +ifeq ($(HAVE_FALLOCATE), true)
> +LCFLAGS += -DFALLOCATE
> +endif
> +
> default: depend $(TARGETS)
>
> include $(BUILDRULES)
> diff --git a/ltp/fsx.c b/ltp/fsx.c
> index 1167d72..b95431e 100644
> --- a/ltp/fsx.c
> +++ b/ltp/fsx.c
> @@ -32,6 +32,9 @@
> #ifdef AIO
> #include <libaio.h>
> #endif
> +#ifdef FALLOCATE
> +#include <linux/falloc.h>
> +#endif
>
> #ifndef MAP_FILE
> # define MAP_FILE 0
> @@ -65,6 +68,7 @@ int logcount = 0; /* total ops */
> #define OP_MAPREAD 5
> #define OP_MAPWRITE 6
> #define OP_SKIPPED 7
> +#define OP_FALLOCATE 8
>
> #undef PAGE_SIZE
> #define PAGE_SIZE getpagesize()
> @@ -105,6 +109,11 @@ long numops = -1; /* -N flag */
> int randomoplen = 1; /* -O flag disables it */
> int seed = 1; /* -S flag */
> int mapped_writes = 1; /* -W flag disables */
> +#ifdef FALLOCATE
> +int fallocate_calls = 1; /* -F flag disables */
> +#else
> +int fallocate_calls = 0; /* -F flag disables */
> +#endif
> int mapped_reads = 1; /* -R flag disables it */
> int fsxgoodfd = 0;
> int o_direct; /* -Z */
> @@ -202,6 +211,7 @@ logdump(void)
> {
> int i, count, down;
> struct log_entry *lp;
> + char *falloc_type[3] = {"PAST_EOF", "EXTENDING", "INTERIOR"};
>
> prt("LOG DUMP (%d total operations):\n", logcount);
> if (logcount < LOGSIZE) {
> @@ -265,6 +275,14 @@ logdump(void)
> badoff < lp->args[!!down])
> prt("\t******WWWW");
> break;
> + case OP_FALLOCATE:
> + /* 0: offset 1: length 2: where alloced */
> + prt("FALLOCATE %s\tfrom 0x%x to 0x%x",
> + falloc_type[lp->args[2]], lp->args[0], lp->args[0] + lp->args[1]);
> + if (badoff >= lp->args[0] &&
> + badoff < lp->args[0] + lp->args[1])
> + prt("\t******FFFF");
> + break;
> case OP_SKIPPED:
> prt("SKIPPED (no operation)");
> break;
> @@ -770,6 +788,64 @@ dotruncate(unsigned size)
> }
> }
>
> +#ifdef FALLOCATE
> +/* fallocate is basically a no-op unless extending, then a lot like a truncate */
> +void
> +dofallocate(unsigned offset, unsigned length)
> +{
> + unsigned end_offset;
> + int keep_size;
> +
> + if (length == 0) {
> + if (!quiet && testcalls > simulatedopcount)
> + prt("skipping zero length fallocate\n");
> + log4(OP_SKIPPED, OP_FALLOCATE, offset, length);
> + return;
> + }
> +
> + keep_size = random() % 2;
> +
> + end_offset = keep_size ? 0 : offset + length;
> +
> + if (end_offset > biggest) {
> + biggest = end_offset;
> + if (!quiet && testcalls > simulatedopcount)
> + prt("fallocating to largest ever: 0x%x\n", end_offset);
> + }
> +
> + /*
> + * last arg:
> + * 1: allocate past EOF
> + * 2: extending prealloc
> + * 3: interior prealloc
> + */
> + log4(OP_FALLOCATE, offset, length, (end_offset > file_size) ? (keep_size ? 1 : 2) : 3);
> +
> + if (end_offset > file_size) {
> + memset(good_buf + file_size, '\0', end_offset - file_size);
> + file_size = end_offset;
> + }
> +
> + if (testcalls <= simulatedopcount)
> + return;
> +
> + if ((progressinterval && testcalls % progressinterval == 0) ||
> + (debug && (monitorstart == -1 || monitorend == -1 ||
> + end_offset <= monitorend)))
> + prt("%lu falloc\tfrom 0x%x to 0x%x\n", testcalls, offset, length);
> + if (fallocate(fd, keep_size ? FALLOC_FL_KEEP_SIZE : 0, (loff_t)offset, (loff_t)length) == -1) {
> + prt("fallocate: %x to %x\n", offset, length);
> + prterr("dofallocate: fallocate");
> + report_failure(161);
> + }
> +}
> +#else
> +void
> +dofallocate(unsigned offset, unsigned length)
> +{
> + return;
> +}
> +#endif
>
> void
> writefileimage()
> @@ -823,7 +899,7 @@ test(void)
> unsigned long offset;
> unsigned long size = maxoplen;
> unsigned long rv = random();
> - unsigned long op = rv % (3 + !lite + mapped_writes);
> + unsigned long op = rv % (3 + !lite + mapped_writes + fallocate_calls);
>
> /* turn off the map read if necessary */
>
> @@ -845,22 +921,33 @@ test(void)
> prt("%lu...\n", testcalls);
>
> /*
> - * READ: op = 0
> - * WRITE: op = 1
> - * MAPREAD: op = 2
> - * TRUNCATE: op = 3
> - * MAPWRITE: op = 3 or 4
> + * lite !lite
> + * READ: op = 0 0
> + * WRITE: op = 1 1
> + * MAPREAD: op = 2 2
> + * TRUNCATE: op = - 3
> + * MAPWRITE: op = 3 4
> + * FALLOCATE: op = - 5
> */
> if (lite ? 0 : op == 3 && (style & 1) == 0) /* vanilla truncate? */
> dotruncate(random() % maxfilelen);
> else {
> if (randomoplen)
> size = random() % (maxoplen+1);
> +
> + /* truncate */
> if (lite ? 0 : op == 3)
> dotruncate(size);
> else {
> offset = random();
> - if (op == 1 || op == (lite ? 3 : 4)) {
> + /* fallocate */
> + if (op == 5) {
> + offset %= maxfilelen;
> + if (offset + size > maxfilelen)
> + size = maxfilelen - offset;
> + dofallocate(offset, size);
> + /* write / mapwrite */
> + } else if (op == 1 || op == (lite ? 3 : 4)) {
> offset %= maxfilelen;
> if (offset + size > maxfilelen)
> size = maxfilelen - offset;
> @@ -868,6 +955,7 @@ test(void)
> domapwrite(offset, size);
> else
> dowrite(offset, size);
> + /* read / mapread */
> } else {
> if (file_size)
> offset %= file_size;
> @@ -904,7 +992,7 @@ void
> usage(void)
> {
> fprintf(stdout, "usage: %s",
> - "fsx [-dnqxALOWZ] [-b opnum] [-c Prob] [-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] [-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\
> @@ -925,8 +1013,11 @@ usage(void)
> #ifdef AIO
> " -A: Use the AIO system calls\n"
> #endif
> -" -D startingop: debug output starting at specified operation\n\
> - -L: fsxLite - no file creations & no file size changes\n\
> +" -D startingop: debug output starting at specified operation\n"
> +#ifdef FALLOCATE
> +" -F: Do not use fallocate (preallocation) calls\n"
> +#endif
> +" -L: fsxLite - no file creations & no file size changes\n\
> -N numops: total # operations to do (default infinity)\n\
> -O: use oplen (see -o flag) for every op (default random)\n\
> -P: save .fsxlog and .fsxgood files in dirpath (default ./)\n\
> @@ -1092,7 +1183,7 @@ main(int argc, char **argv)
>
> setvbuf(stdout, (char *)0, _IOLBF, 0); /* line buffered stdout */
>
> - while ((ch = getopt(argc, argv, "b:c:dfl:m:no:p:qr:s:t:w:xyAD:LN:OP:RS:WZ"))
> + while ((ch = getopt(argc, argv, "b:c:dfl:m:no:p:qr:s:t:w:xyAD:FLN:OP:RS:WZ"))
> != EOF)
> switch (ch) {
> case 'b':
> @@ -1186,6 +1277,9 @@ main(int argc, char **argv)
> if (debugstart < 1)
> usage();
> break;
> + case 'F':
> + fallocate_calls = 0;
> + break;
> case 'L':
> lite = 1;
> break;
> @@ -1331,6 +1425,16 @@ main(int argc, char **argv)
> } else
> check_trunc_hack();
>
> +#ifdef FALLOCATE
> + if (!lite && fallocate_calls) {
> + if (fallocate(fd, 0, 0, 1) && errno == EOPNOTSUPP) {
> + warn("main: filesystem does not support fallocate, disabling");
> + fallocate_calls = 0;
> + } else
> + ftruncate(fd, 0);
> + }
> +#endif
> +
> while (numops == -1 || numops--)
> test();
>
> --
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Cheers, Andreas
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fsx.c
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