linux-kernel - NFS: double dentries in directory with 2.6.20

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Date:	Fri, 16 Mar 2007 13:59:05 +0100
From:	"Metathronius Galabant" <m.galabant@...glemail.com>
To:	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: NFS: double dentries in directory with 2.6.20

Hi,

today I experienced double directory entries from a NFS mounted dir,
e.g. the file "file1.ext" is listed *twice* in the output.

The following under a 2.6.20 NFS client; Server was 2.6.18.8, NFS over UDP.
Mountpoint was not superblock-shared because it was a unique mount.

ls output:

drwxr-xr-x  3 user grp  296 Mar 15 17:28 ./
drwxr-xr-x  3 user grp  296 Mar 15 17:28 ./
drwxr-xr-x  3 user grp   72 Mar 15 17:28 ../
drwxr-xr-x  3 user grp   72 Mar 15 17:28 ../
drwxr-xr-x  2 user grp   80 Mar 15 17:28 00001/
drwxr-xr-x  2 user grp   80 Mar 15 17:28 00001/
-rw-r--r--  1 user grp  357 Mar 15 17:28 00001.patterns.pvset
-rw-r--r--  1 user grp 2057 Mar 15 17:28 00001.proc.pbs
-rw-r--r--  1 user grp   66 Mar 15 17:28 00001.proc.pbs.dep
-rw-r--r--  1 user grp   23 Mar 15 17:28 00001.proc.pbs.id
-rw-r--r--  1 user grp    0 Mar 15 17:28 00001.proc.pbs.queued
-rw-r--r--  1 user grp    0 Mar 15 17:28 00001.proc.pbs.queued
-rw-r--r--  1 user grp  784 Mar 15 17:28 00001.proc.pvset

strace for getdents():

getdents64(3, {{d_ino=14652528, d_off=1, d_type=DT_DIR, d_reclen=24,
d_name="."} {d_ino=14652526, d_off=2, d_type=DT_DIR, d_reclen=24,
d_name=".."} {d_ino=14654778, d_off=3, d_type=DT_DIR, d_reclen=32,
d_name="00001"} {d_ino=14656129, d_off=4, d_type=DT_REG, d_reclen=48,
d_name="00001.proc.pbs.queued"} {d_ino=14652528, d_off=5,
d_type=DT_DIR, d_reclen=24, d_name="."} {d_ino=14652526, d_off=6,
d_type=DT_DIR, d_reclen=24, d_name=".."} {d_ino=14654778, d_off=7,
d_type=DT_DIR, d_reclen=32, d_name="00001"} {d_ino=14656129, d_off=8,
d_type=DT_REG, d_reclen=48, d_name="00001.proc.pbs.queued"}
{d_ino=14656022, d_off=9, d_type=DT_REG, d_reclen=40,
d_name="00001.proc.pbs.id"} {d_ino=14654835, d_off=10, d_type=DT_REG,
d_reclen=40, d_name="00001.proc.pbs.dep"} {d_ino=14654838, d_off=11,
d_type=DT_REG, d_reclen=40, d_name="00001.proc.pvset"}
{d_ino=14654841, d_off=12, d_type=DT_REG, d_reclen=40,
d_name="00001.patterns.pvset"} {d_ino=14654832, d_off=13,
d_type=DT_REG, d_reclen=40, d_name="00001.proc.pbs"}}, 32768) = 456

Only umounting and remounting did cure the problem which hasn't
reappeared as of now. The problem seemed to be localized into one
directory.

ATM I don't know how to track that down or supply any more information.
Please include me on CC.

Cheers,
M
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