On Mon, Jul 11, 2011 at 03:21, huang jun <hjwsm1989@xxxxxxxxx> wrote:
> hi, developers
> we use ceph v0.30, kernel client 2.6.37
> mount ceph on /mnt
> $ mkdir /mnt/a
> $ cd a
> $ seq 10 | xargs -i mkdir {}
> $ cd ..
> $ rm -rf a
> from the debug log of mds.we find
> if we want remove one subdirectory in "a", we must execute readdir " a
> " operation each time
> so we need read dir "a" 10 times.
> but in normal way, it should readdir "a" once, and remove all the
> subdirectories if we use "rm -rf a".
>
> we'd like to know how did ceph parse command "rm -rf " ?
Was there an actual error from "rm -rf a"? What was the message? What
did the mds debug log say? Please provide more detail.
Ceph does not parse "rm -rf"; rm does a
opendir(3)/readdir(3)/closedir(3) loop and within it, unlink(2)s the
files (or recurses into subdirectories); Ceph receives these
filesystem manipulation system calls via the Linux kernel's VFS
subsystem.
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