On 9/3/13 8:13 AM, Wang Shilong wrote: > Hello Eric, > > Recently, i notice btrfs-progs's magic return value. For example, EACCESS > return 12. > Magic return value is confusing for code reviewers. However,at least we > should guarantee > all these conditions return the same value(for example 12 for this case) > > Or we can change all the magic number to 1. Miao reminded me that > there may be some applications that have catched and checked these > magic return values… > > Any ideas about this?
I think that if we want to do anything different from the standard, expected "return 1 and set errno" then it needs to be a careful design decision, documented, used consistently, and tested. As far as I can tell, what is in btrfs-progs today is undocumented, untested, and only occasionally/randomly used. Therefore I don't think it's useful as it stands today, and why I had started removing them. -Eric > Thanks, > Wang >> From: >> Just whitespace fixes, and magical return value removal. >> >> Signed-off-by: Eric Sandeen <[email protected]> >> --- >> cmds-subvolume.c | 18 +++++++++--------- >> 1 file changed, 9 insertions(+), 9 deletions(-) >> >> diff --git a/cmds-subvolume.c b/cmds-subvolume.c >> index 01b982c..a9999ac 100644 >> --- a/cmds-subvolume.c >> +++ b/cmds-subvolume.c >> @@ -104,9 +104,9 @@ static int cmd_subvol_create(int argc, char **argv) >> dst = argv[optind]; >> >> res = test_isdir(dst); >> - if(res >= 0 ){ >> + if (res >= 0) { >> fprintf(stderr, "ERROR: '%s' exists\n", dst); >> - return 12; >> + return 1; >> } >> >> newname = strdup(dst); >> @@ -114,24 +114,24 @@ static int cmd_subvol_create(int argc, char **argv) >> dstdir = strdup(dst); >> dstdir = dirname(dstdir); >> >> - if( !strcmp(newname,".") || !strcmp(newname,"..") || >> + if (!strcmp(newname, ".") || !strcmp(newname, "..") || >> strchr(newname, '/') ){ >> fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n", >> newname); >> - return 14; >> + return 1; >> } >> >> len = strlen(newname); >> if (len == 0 || len >= BTRFS_VOL_NAME_MAX) { >> fprintf(stderr, "ERROR: subvolume name too long ('%s)\n", >> newname); >> - return 14; >> + return 1; >> } >> >> fddst = open_file_or_dir(dstdir); >> if (fddst < 0) { >> fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir); >> - return 12; >> + return 1; >> } >> >> printf("Create subvolume '%s/%s'\n", dstdir, newname); >> @@ -159,10 +159,10 @@ static int cmd_subvol_create(int argc, char **argv) >> close(fddst); >> free(inherit); >> >> - if(res < 0 ){ >> - fprintf( stderr, "ERROR: cannot create subvolume - %s\n", >> + if (res < 0) { >> + fprintf(stderr, "ERROR: cannot create subvolume - %s\n", >> strerror(e)); >> - return 11; >> + return 1; >> } >> >> return 0; >> -- >> 1.7.11.7 >> > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
