From: Trond Myklebust Date: Sun, 28 Jan 2018 14:29:41 +0000 (-0500) Subject: NFS: Fix a race between mmap() and O_DIRECT X-Git-Tag: v4.19~1594^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e231c6879cfd44e4fffd384bb6dd7d313249a523;p=platform%2Fkernel%2Flinux-rpi.git NFS: Fix a race between mmap() and O_DIRECT When locking the file in order to do O_DIRECT on it, we must unmap any mmapped ranges on the pagecache so that we can flush out the dirty data. Fixes: a5864c999de67 ("NFS: Do not serialise O_DIRECT reads and writes") Signed-off-by: Trond Myklebust Cc: stable@vger.kernel.org # v4.8+ --- diff --git a/fs/nfs/io.c b/fs/nfs/io.c index 20fef85..9034b49 100644 --- a/fs/nfs/io.c +++ b/fs/nfs/io.c @@ -99,7 +99,7 @@ static void nfs_block_buffered(struct nfs_inode *nfsi, struct inode *inode) { if (!test_bit(NFS_INO_ODIRECT, &nfsi->flags)) { set_bit(NFS_INO_ODIRECT, &nfsi->flags); - nfs_wb_all(inode); + nfs_sync_mapping(inode->i_mapping); } }