From 1e564d3dbd684a105582471cb9ff2aada64a9052 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sat, 25 Jun 2016 17:50:53 -0400 Subject: NFSv4.2: Fix a race in nfs42_proc_deallocate() When punching holes in a file, we want to ensure the operation is serialised w.r.t. other writes, meaning that we want to call nfs_sync_inode() while holding the inode lock. Signed-off-by: Trond Myklebust --- fs/nfs/nfs42proc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'fs/nfs/nfs42proc.c') diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c index aa03ed09ba06..0f9f536e647b 100644 --- a/fs/nfs/nfs42proc.c +++ b/fs/nfs/nfs42proc.c @@ -113,15 +113,17 @@ int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len) if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE)) return -EOPNOTSUPP; - nfs_wb_all(inode); inode_lock(inode); + err = nfs_sync_inode(inode); + if (err) + goto out_unlock; err = nfs42_proc_fallocate(&msg, filep, offset, len); if (err == 0) truncate_pagecache_range(inode, offset, (offset + len) -1); if (err == -EOPNOTSUPP) NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE; - +out_unlock: inode_unlock(inode); return err; } -- cgit v1.2.3