On 12/02/2015 02:41 PM, Theodore Ts'o wrote:
On Tue, Dec 01, 2015 at 05:59:07PM +0100, Vegard Nossum wrote:
Strange that you get EACCESS, without errors=remount-ro I get:
open("/dev/loop0", O_RDWR) = 3
mkdir("/mnt/ext4", 0755) = -1 EEXIST (File exists)
open("ext4.0", O_RDWR) = 4
ioctl(3, LOOP_SET_FD, 0x4) = 0
close(4) = 0
ioctl(3, LOOP_SET_STATUS64, {offset=0, number=0, flags=0,
file_name="ext4.0", ...}) = 0
mount("/dev/loop0", "/mnt/ext4", "ext4", 0, NULL) = 0
open("/mnt/ext4", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 4
getdents(4, <panic>
What is the source code of your test program, and what version of C
library are you using? On my system, opendir() is getting translated
to:
openat(AT_FDCWD, "/vdc", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = -1 EACCES (Permission denied)
(It would have saved me time if you had sent me the source of your
test program, BTW.)
Hi Ted,
Sorry for dropping the ball on you here.
My test program is simply doing the loopback setup + mount() +
readdir(opendir(<mountpoint>)), there's nothing special about it.
Unfortunately, company policy prohibits me from sharing the actual code.
Compiling a simple readdir(opendir(".")) yields the same result:
open(".", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
brk(0) = 0xa87000
brk(0xab0000) = 0xab0000
getdents(3, /* 29 entries */, 32768) = 904
This particular install is glibc 2.13-38+deb7u8, so it's admittedly
fairly old.
However, if you say it's not a bug when not mounted with
errors=remount-ro, I don't expect anybody to keep looking into this.
Vegard
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