On 12/14/2012 04:17 AM, Jim Meyering wrote:
Eric Wong wrote:
Jim Meyering <j...@meyering.net> wrote:
Eric Wong wrote:
* lib/mountlist.c (ME_DUMMY_0):
additional dummy FS names for Linux systems.
- "devpts" PTY slave filesystem
- "fusectl" control filesystem for FUSE
- "mqueue" enumerates POSIX message queues
- "rpc_pipefs" kernel <-> userspace bridge for NFS
- "sysfs" is for exporting kernel objects
- "devfs" device filesystem for Linux 2.4 and FreeBSD
There are likely more dummy FSes I am not aware of.
Thanks. I'll look at this Sat or Sunday.
What's the motivation? Have df hide those entries?
It just seems right to mark those as dummy since they
aren't used for normal file storage.
It allows cmogstored[1] to skip some entries and avoid extra
stat() and a tiny amount of memory allocation. No big deal
with or without it.
[1] http://bogomips.org/cmogstored/README
Thanks. I've tweaked the log and added a matching ChangeLog entry.
Testing via df on my F18 laptop, diff -u <(src/df-prev) <(src/df)
shows no difference. What do people think of this entry from
that F18 system?
devtmpfs 1538304 0 1538304 0% /dev
If we're omitting "devfs", then should "devtmpfs" also be omitted?
I don't think "devtmpfs" should be marked as dummy
as there is storage associated with it.
I.E. you can write normal files to /dev and space will be consumed.
Note df already excludes most dummy file systems
by default by checking the size like:
if (fsu.fsu_blocks == 0 && !show_all_fs && !show_listed_fs)
return;
thanks,
Pádraig.
