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authorTrond Myklebust <Trond.Myklebust@netapp.com>2010-08-04 09:29:52 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-08-06 13:41:39 -0400
commit761fe93cdfa29071879d882c92e966ae692c0048 (patch)
tree7d4e3cbf0d17703bb3457f9a2c2cceb930e0f59d /fs/nfs
parent0d8a374673c9bc62bc78a2d8fe64553a51542cb4 (diff)
downloadlinux-761fe93cdfa29071879d882c92e966ae692c0048.tar.bz2
NFS: Fix the locking in nfs4_callback_getattr
The delegation is protected by RCU now, so we need to replace the nfsi->rwsem protection with an rcu protected section. Reported-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/callback_proc.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 7445dd0ae3f3..930d10fecdaf 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -37,8 +37,8 @@ __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *
if (inode == NULL)
goto out_putclient;
nfsi = NFS_I(inode);
- down_read(&nfsi->rwsem);
- delegation = nfsi->delegation;
+ rcu_read_lock();
+ delegation = rcu_dereference(nfsi->delegation);
if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
goto out_iput;
res->size = i_size_read(inode);
@@ -53,7 +53,7 @@ __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *
args->bitmap[1];
res->status = 0;
out_iput:
- up_read(&nfsi->rwsem);
+ rcu_read_unlock();
iput(inode);
out_putclient:
nfs_put_client(clp);