From 08bc03539d38508eff3fd470a82ea422ce279f6e Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Fri, 23 May 2014 06:50:21 -0400 Subject: [PATCH] cifs: revalidate mapping prior to satisfying read_iter request with cache=loose Before satisfying a read with cache=loose, we should always check that the pagecache is valid before allowing a read to be satisfied out of it. Reported-by: Tetsuo Handa Signed-off-by: Jeff Layton Signed-off-by: Steve French --- fs/cifs/cifsfs.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 2c90d07c0b3a..888398067420 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -725,6 +725,19 @@ cifs_do_mount(struct file_system_type *fs_type, goto out; } +static ssize_t +cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter) +{ + ssize_t rc; + struct inode *inode = file_inode(iocb->ki_filp); + + rc = cifs_revalidate_mapping(inode); + if (rc) + return rc; + + return generic_file_read_iter(iocb, iter); +} + static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct inode *inode = file_inode(iocb->ki_filp); @@ -881,7 +894,7 @@ const struct inode_operations cifs_symlink_inode_ops = { const struct file_operations cifs_file_ops = { .read = new_sync_read, .write = new_sync_write, - .read_iter = generic_file_read_iter, + .read_iter = cifs_loose_read_iter, .write_iter = cifs_file_write_iter, .open = cifs_open, .release = cifs_close, @@ -939,7 +952,7 @@ const struct file_operations cifs_file_direct_ops = { const struct file_operations cifs_file_nobrl_ops = { .read = new_sync_read, .write = new_sync_write, - .read_iter = generic_file_read_iter, + .read_iter = cifs_loose_read_iter, .write_iter = cifs_file_write_iter, .open = cifs_open, .release = cifs_close,