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mmap_seek: print error code and text on failure

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If lseek() returns an unexpected error, it's useful to know the error
code to help connect it to the trouble spot inside the module.

Since the two seek functions should be basically identical, lift them
into a single generic function.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Robert Evans <evansr@google.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17843
This commit is contained in:
Rob Norris 2025-10-15 09:57:35 +11:00 committed by Tony Hutter
parent 3378a324df
commit 1956417b54
1 changed files with 23 additions and 14 deletions
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37
tests/zfs-tests/cmd/mmap_seek.c
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@ -47,25 +47,34 @@
#endif
static void
seek_data(int fd, off_t offset, off_t expected)
seek_expect(int fd, off_t offset, int whence, off_t expect_offset)
{
off_t data_offset = lseek(fd, offset, SEEK_DATA);
if (data_offset != expected) {
fprintf(stderr, "lseek(fd, %d, SEEK_DATA) = %d (expected %d)\n",
(int)offset, (int)data_offset, (int)expected);
exit(2);
}
errno = 0;
off_t seek_offset = lseek(fd, offset, whence);
if (seek_offset == expect_offset)
return;
int err = errno;
fprintf(stderr, "lseek(fd, %ld, SEEK_%s) = %ld (expected %ld)",
offset, (whence == SEEK_DATA ? "DATA" : "HOLE"),
seek_offset, expect_offset);
if (err != 0)
fprintf(stderr, " (errno %d [%s])\n", err, strerror(err));
else
fputc('\n', stderr);
exit(2);
}
static void
static inline void
seek_data(int fd, off_t offset, off_t expected)
{
seek_expect(fd, offset, SEEK_DATA, expected);
}
static inline void
seek_hole(int fd, off_t offset, off_t expected)
{
off_t hole_offset = lseek(fd, offset, SEEK_HOLE);
if (hole_offset != expected) {
fprintf(stderr, "lseek(fd, %d, SEEK_HOLE) = %d (expected %d)\n",
(int)offset, (int)hole_offset, (int)expected);
exit(2);
}
seek_expect(fd, offset, SEEK_HOLE, expected);
}
int