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btrfs-progs: defrag: set errno correctly in the callback 

In case defrag fails, the errno is not properly reported everywhere but
rather the last value of 'e', which could be 0. Then we get confusing
error messages like:

ERROR: defrag failed on /path/to/file: Success

Reported-by: Adam Mizerski <adam@mizerski.pl>
Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2016-09-20 16:45:36 +02:00
parent eccba6261a
commit d75e061bcd
1 changed files with 9 additions and 6 deletions
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15
cmds-filesystem.c
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@ -993,32 +993,35 @@ static int defrag_callback(const char *fpath, const struct stat *sb,
int typeflag, struct FTW *ftwbuf)
{
int ret = 0;
int e = 0;
int err = 0;
int fd = 0;
if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
if (defrag_global_verbose)
printf("%s\n", fpath);
fd = open(fpath, O_RDWR);
if (fd < 0)
if (fd < 0) {
err = errno;
goto error;
}
ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
e = errno;
close(fd);
if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
if (ret && errno == ENOTTY && defrag_global_fancy_ioctl) {
error("defrag range ioctl not "
"supported in this kernel, please try "
"without any options.");
defrag_global_errors++;
return ENOTTY;
}
if (ret)
if (ret) {
err = errno;
goto error;
}
}
return 0;
error:
error("defrag failed on %s: %s", fpath, strerror(e));
error("defrag failed on %s: %s", fpath, strerror(err));
defrag_global_errors++;
return 0;
}