Re: [PATCH v8 11/11] xfstests: fsx: Add fallocate insert range operation

Brian Foster
2015-01-14T20:16:29Z

On Wed, Jan 14, 2015 at 01:05:26AM +0900, Namjae Jeon wrote:
> From: Namjae Jeon <namjae.jeon@samsung.com>
>
> This commit adds fallocate FALLOC_FL_INSERT_RANGE support for fsx.
>
> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
> Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
> Cc: Brian Foster<bfoster@redhat.com>
> ---
> Changelog
> v8:
> - create TRIM_OFF() and TRIM_LEN() and redeine redefine TRIM_OFF_LEN().
>
> ltp/fsx.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 113 insertions(+), 9 deletions(-)
>
> diff --git a/ltp/fsx.c b/ltp/fsx.c
> index 3709419..741af34 100644
> --- a/ltp/fsx.c
> +++ b/ltp/fsx.c
> @@ -95,7 +95,8 @@ int logcount = 0; /* total ops */
> #define OP_PUNCH_HOLE 6
> #define OP_ZERO_RANGE 7
> #define OP_COLLAPSE_RANGE 8
> -#define OP_MAX_FULL 9
> +#define OP_INSERT_RANGE 9
> +#define OP_MAX_FULL 10
>
> /* operation modifiers */
> #define OP_CLOSEOPEN 100
> @@ -145,6 +146,7 @@ int fallocate_calls = 1; /* -F flag disables */
> int punch_hole_calls = 1; /* -H flag disables */
> int zero_range_calls = 1; /* -z flag disables */
> int collapse_range_calls = 1; /* -C flag disables */
> +int insert_range_calls = 1; /* -i flag disables */
> int mapped_reads = 1; /* -R flag disables it */
> int fsxgoodfd = 0;
> int o_direct; /* -Z */
> @@ -339,6 +341,14 @@ logdump(void)
> lp->args[0] + lp->args[1])
> prt("\t******CCCC");
> break;
> + case OP_INSERT_RANGE:
> + prt("INSERT 0x%x thru 0x%x\t(0x%x bytes)",
> + lp->args[0], lp->args[0] + lp->args[1] - 1,
> + lp->args[1]);
> + if (badoff >= lp->args[0] && badoff <
> + lp->args[0] + lp->args[1])
> + prt("\t******CCCC");
> + break;
> case OP_SKIPPED:
> prt("SKIPPED (no operation)");
> break;
> @@ -1012,6 +1022,59 @@ do_collapse_range(unsigned offset, unsigned length)
> }
> #endif
>
> +#ifdef FALLOC_FL_INSERT_RANGE
> +void
> +do_insert_range(unsigned offset, unsigned length)
> +{
> + unsigned end_offset;
> + int mode = FALLOC_FL_INSERT_RANGE;
> +
> + if (length == 0) {
> + if (!quiet && testcalls > simulatedopcount)
> + prt("skipping zero length insert range\n");
> + log4(OP_SKIPPED, OP_INSERT_RANGE, offset, length);
> + return;
> + }
> +
> + if ((loff_t)offset >= file_size) {
> + if (!quiet && testcalls > simulatedopcount)
> + prt("skipping insert range behind EOF\n");
> + log4(OP_SKIPPED, OP_INSERT_RANGE, offset, length);
> + return;
> + }
> +
> + log4(OP_INSERT_RANGE, offset, length, 0);
> +
> + if (testcalls <= simulatedopcount)
> + return;
> +
> + end_offset = offset + length;
> + if ((progressinterval && testcalls % progressinterval == 0) ||
> + (debug && (monitorstart == -1 || monitorend == -1 ||
> + end_offset <= monitorend))) {
> + prt("%lu insert\tfrom 0x%x to 0x%x, (0x%x bytes)\n", testcalls,
> + offset, offset+length, length);
> + }
> + if (fallocate(fd, mode, (loff_t)offset, (loff_t)length) == -1) {
> + prt("insert range: %x to %x\n", offset, length);
> + prterr("do_insert_range: fallocate");
> + report_failure(161);
> + }
> +
> + memmove(good_buf + end_offset, good_buf + offset,
> + file_size - offset);
> + memset(good_buf + offset, '\0', length);
> + file_size += length;
> +}
> +
> +#else
> +void
> +do_insert_range(unsigned offset, unsigned length)
> +{
> + return;
> +}
> +#endif
> +
> #ifdef HAVE_LINUX_FALLOC_H
> /* fallocate is basically a no-op unless extending, then a lot like a truncate */
> void
> @@ -1117,14 +1180,25 @@ docloseopen(void)
> }
> }
>
> -#define TRIM_OFF_LEN(off, len, size) \
> -do { \
> - if (size) \
> +
> +#define TRIM_OFF(off, size) \
> +do { \
> + if (size) \
> (off) %= (size); \
> - else \
> - (off) = 0; \
> - if ((off) + (len) > (size)) \
> - (len) = (size) - (off); \
> + else \
> + (off) = 0; \
> +} while (0)
> +
> +#define TRIM_LEN(off, len, size) \
> +do { \
> + if ((off) + (len) > (size)) \
> + (len) = (size) - (off); \
> +} while (0)
> +
> +#define TRIM_OFF_LEN(off, len, size) \
> +do { \
> + TRIM_OFF(off, size); \
> + TRIM_LEN(off, len, size); \
> } while (0)
>
> void
> @@ -1192,6 +1266,12 @@ test(void)
> goto out;
> }
> break;
> + case OP_INSERT_RANGE:
> + if (!insert_range_calls) {
> + log4(OP_SKIPPED, OP_INSERT_RANGE, offset, size);
> + goto out;
> + }
> + break;
> }
>
> switch (op) {
> @@ -1244,6 +1324,22 @@ test(void)
> }
> do_collapse_range(offset, size);
> break;
> + case OP_INSERT_RANGE:
> + TRIM_OFF(offset, file_size);
> + TRIM_LEN(offset, size, maxfilelen - file_size);

Ugh, I hit a crash down in do_insert_range() due to the memset() on
good_buf going off the end of the buffer. It looks like the TRIM_LEN()
here is not correct and can result in a really large length value.

Perhaps something like TRIM_LEN(file_size, length, maxfilelen) is what
we want for insert range ops?

Brian

> + offset = offset & ~(block_size - 1);
> + size = size & ~(block_size - 1);
> + if (size == 0) {
> + log4(OP_SKIPPED, OP_INSERT_RANGE, offset, size);
> + goto out;
> + }
> + if (file_size + size > maxfilelen) {
> + log4(OP_SKIPPED, OP_INSERT_RANGE, offset, size);
> + goto out;
> + }
> +
> + do_insert_range(offset, size);
> + break;
> default:
> prterr("test: unknown operation");
> report_failure(42);
> @@ -1307,6 +1403,9 @@ usage(void)
> #ifdef FALLOC_FL_COLLAPSE_RANGE
> " -C: Do not use collapse range calls\n"
> #endif
> +#ifdef FALLOC_FL_INSERT_RANGE
> +" -i: Do not use insert range 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\
> @@ -1493,7 +1592,7 @@ 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:FHzCLN:OP:RS:WZ"))
> + while ((ch = getopt(argc, argv, "b:c:dfl:m:no:p:qr:s:t:w:xyAD:FHzCiLN:OP:RS:WZ"))
> != EOF)
> switch (ch) {
> case 'b':
> @@ -1599,6 +1698,9 @@ main(int argc, char **argv)
> case 'C':
> collapse_range_calls = 0;
> break;
> + case 'i':
> + insert_range_calls = 0;
> + break;
> case 'L':
> lite = 1;
> break;
> @@ -1758,6 +1860,8 @@ main(int argc, char **argv)
> zero_range_calls = test_fallocate(FALLOC_FL_ZERO_RANGE);
> if (collapse_range_calls)
> collapse_range_calls = test_fallocate(FALLOC_FL_COLLAPSE_RANGE);
> + if (insert_range_calls)
> + insert_range_calls = test_fallocate(FALLOC_FL_INSERT_RANGE);
>
> while (numops == -1 || numops--)
> test();
> --
> 1.7.9.5
>