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NFS: Fix spurious readdir cookie loop messages

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If the directory contents change, then we have to accept that the
file->f_pos value may shrink if we do a 'search-by-cookie'. In that
case, we should turn off the loop detection and let the NFS client
try to recover.

The patch also fixes a second loop detection bug by ensuring
that after turning on the ctx->duped flag, we read at least one new
cookie into ctx->dir_cookie before attempting to match with
ctx->dup_cookie.

Reported-by: Petr Vandrovec <petr@vandrovec.name>
Cc: stable@kernel.org [2.6.39+]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2011-07-30 12:45:35 -04:00
parent ed1e6211a0
commit 0c0308066c
2 changed files with 35 additions and 24 deletions
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3
include/linux/nfs_fs.h
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@ -99,9 +99,10 @@ struct nfs_open_context {
struct nfs_open_dir_context {
struct rpc_cred *cred;
unsigned long attr_gencount;
__u64 dir_cookie;
__u64 dup_cookie;
int duped;
signed char duped;
};
/*