Re: [fuse-devel] -EPERM from create() and getattr()

[David B. <and...@gm...>]

On Mon, Jan 28, 2013 at 3:54 AM, Hans Beckérus <han...@gm...>wrote:

> Looks like the problem is in the way utimensat() is used by touch? Why
> would it call utimensat() when the creat() call returned -EPERM?
>

Possibly because you could be running touch on a directory and open might
fail on a directory?


>
> Hans
>
> open("x", O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK|O_LARGEFILE, 0666) = -1
> EPERM (Operation not permitted)
> utimensat(AT_FDCWD, "x", NULL, 0)       = -1 ENOENT (No such file or
> directory)
> open("/usr/share/locale/locale.alias", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0xb7849000
> read(3, "# Locale name alias data base.\n#"..., 4096) = 2570
> read(3, "", 4096)                       = 0
> close(3)                                = 0
>
>
>
> On 1/25/13, Miklos Szeredi <mi...@sz...> wrote:
> > On Tue, Jan 15, 2013 at 4:11 PM, Hans Beckérus <han...@gm...>
> > wrote:
> >>
> >> Hans Beckerus <hans.beckerus@...> writes:
> >>
> >>>
> >>>
> >>> I have a scenario in my high-level FS that should result in an
> >>> "Operation not permitted" error when doing eg. 'touch'.
> >>> But on some systems I have trouble getting that. I think the reason is
> >>> somewhat related to the below:
> >
> > Hmm, some more info would be useful.  It might be an issue with the
> > touch program, not fuse or the kernel.   Try doing a "strace touch
> > ..." and cut out the interesting part from the end (where it creates
> > the file and returns an error).
> >
> > Thanks,
> > Miklos
> >
>
>
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