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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-08-04 09:29:52 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-08-06 13:41:39 -0400 |
| commit | 761fe93cdfa29071879d882c92e966ae692c0048 (patch) | |
| tree | 7d4e3cbf0d17703bb3457f9a2c2cceb930e0f59d /fs/nfs | |
| parent | 0d8a374673c9bc62bc78a2d8fe64553a51542cb4 (diff) | |
| download | linux-stable-761fe93cdfa29071879d882c92e966ae692c0048.tar.gz linux-stable-761fe93cdfa29071879d882c92e966ae692c0048.tar.bz2 linux-stable-761fe93cdfa29071879d882c92e966ae692c0048.zip | |
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.c | 6 |
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); |