David Woodhouse 2f9092e102 Fix i_mutex vs. readdir handling in nfsd ... Commit 14f7dd63 ("Copy XFS readdir hack into nfsd code") introduced a bug to generic code which had been extant for a long time in the XFS version -- it started to call through into lookup_one_len() and hence into the file systems' ->lookup() methods without i_mutex held on the directory. This patch fixes it by locking the directory's i_mutex again before calling the filldir functions. The original deadlocks which commit 14f7dd63 was designed to avoid are still avoided, because they were due to fs-internal locking, not i_mutex. While we're at it, fix the return type of nfsd_buffered_readdir() which should be a __be32 not an int -- it's an NFS errno, not a Linux errno. And return nfserrno(-ENOMEM) when allocation fails, not just -ENOMEM. Sparse would have caught that, if it wasn't so busy bitching about __cold__. Commit 05f4f678 ("nfsd4: don't do lookup within readdir in recovery code") introduced a similar problem with calling lookup_one_len() without i_mutex, which this patch also addresses. To fix that, it was necessary to fix the called functions so that they expect i_mutex to be held; that part was done by J. Bruce Fields. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Umm-I-can-live-with-that-by: Al Viro <viro@zeniv.linux.org.uk> Reported-by: J. R. Okajima <hooanon05@yahoo.co.jp> Tested-by: J. Bruce Fields <bfields@citi.umich.edu> LKML-Reference: <8036.1237474444@jrobl> Cc: stable@kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2009-04-20 23:01:16 -04:00
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auth.c
auth.h
export.c
Kconfig
lockd.c
Makefile
nfs2acl.c
nfs3acl.c
nfs3proc.c
nfs3xdr.c
nfs4acl.c
nfs4callback.c
nfs4idmap.c
nfs4proc.c	nfsd41: CREATE_EXCLUSIVE4_1	2009-04-03 17:41:23 -07:00
nfs4recover.c	Fix i_mutex vs. readdir handling in nfsd	2009-04-20 23:01:16 -04:00
nfs4state.c	nfsd41: add OPEN4_SHARE_ACCESS_WANT nfs4_stateid bmap	2009-04-03 17:41:21 -07:00
nfs4xdr.c	nfsd41: CREATE_EXCLUSIVE4_1	2009-04-03 17:41:23 -07:00
nfscache.c
nfsctl.c	Merge branch 'for-2.6.30' of git://linux-nfs.org/~bfields/linux	2009-04-06 13:25:56 -07:00
nfsfh.c
nfsproc.c
nfssvc.c	Merge branch 'for-2.6.30' of git://linux-nfs.org/~bfields/linux	2009-04-06 13:25:56 -07:00
nfsxdr.c
stats.c
vfs.c	Fix i_mutex vs. readdir handling in nfsd	2009-04-20 23:01:16 -04:00