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cifs: revalidate mapping prior to satisfying read_iter request with cache=loose

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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 <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton 2014-05-23 06:50:21 -04:00 committed by Steve French
parent a1d0b84c30
commit 08bc03539d
1 changed files with 15 additions and 2 deletions
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17
fs/cifs/cifsfs.c
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@ -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,