[PATCH 7/8] cifs: add revalidation wrapper for splice_read

Ensure that inode attributes are revalidated prior to a cache read.

Signed-off-by: Jeff Layton <[email protected]>
---
 fs/cifs/cifsfs.c |    8 ++++----
 fs/cifs/cifsfs.h |    3 +++
 fs/cifs/file.c   |   19 +++++++++++++++++++
 3 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 9f1d94e..ddafac4 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -747,7 +747,7 @@ const struct file_operations cifs_file_ops = {
 	.fsync = cifs_fsync,
 	.flush = cifs_flush,
 	.mmap  = cifs_file_mmap,
-	.splice_read = generic_file_splice_read,
+	.splice_read = cifs_file_splice_read,
 	.llseek = cifs_llseek,
 #ifdef CONFIG_CIFS_POSIX
 	.unlocked_ioctl	= cifs_ioctl,
@@ -769,7 +769,7 @@ const struct file_operations cifs_file_direct_ops = {
 	.fsync = cifs_fsync,
 	.flush = cifs_flush,
 	.mmap = cifs_file_mmap,
-	.splice_read = generic_file_splice_read,
+	.splice_read = cifs_file_splice_read,
 #ifdef CONFIG_CIFS_POSIX
 	.unlocked_ioctl  = cifs_ioctl,
 #endif /* CONFIG_CIFS_POSIX */
@@ -788,7 +788,7 @@ const struct file_operations cifs_file_nobrl_ops = {
 	.fsync = cifs_fsync,
 	.flush = cifs_flush,
 	.mmap  = cifs_file_mmap,
-	.splice_read = generic_file_splice_read,
+	.splice_read = cifs_file_splice_read,
 	.llseek = cifs_llseek,
 #ifdef CONFIG_CIFS_POSIX
 	.unlocked_ioctl	= cifs_ioctl,
@@ -808,7 +808,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = {
 	.release = cifs_close,
 	.fsync = cifs_fsync,
 	.flush = cifs_flush,
-	.splice_read = generic_file_splice_read,
+	.splice_read = cifs_file_splice_read,
 #ifdef CONFIG_CIFS_POSIX
 	.unlocked_ioctl  = cifs_ioctl,
 #endif /* CONFIG_CIFS_POSIX */
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index c7eac06..57eae81 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -86,6 +86,9 @@ extern ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 extern int cifs_lock(struct file *, int, struct file_lock *);
 extern int cifs_fsync(struct file *, struct dentry *, int);
 extern int cifs_flush(struct file *, fl_owner_t id);
+extern ssize_t cifs_file_splice_read(struct file *filp, loff_t *ppos,
+			struct pipe_inode_info *pipe, size_t count,
+			unsigned int flags);
 extern ssize_t cifs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 				unsigned long nr_segs, loff_t pos);
 extern int cifs_file_mmap(struct file * , struct vm_area_struct *);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 1f720b2..37d61ce 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1889,6 +1889,25 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
 }
 
 ssize_t
+cifs_file_splice_read(struct file *filp, loff_t *ppos,
+			struct pipe_inode_info *pipe, size_t count,
+			unsigned int flags)
+{
+	int rc;
+	struct dentry *dentry = filp->f_path.dentry;
+
+	cFYI(1, ("%s: splice_read(%s/%s, %lu@%Lu)\n", __func__,
+		dentry->d_parent->d_name.name, dentry->d_name.name,
+		(unsigned long) count, (unsigned long long) *ppos));
+
+	rc = cifs_revalidate_file(filp);
+	if (rc)
+		return rc;
+
+	return generic_file_splice_read(filp, ppos, pipe, count, flags);
+}
+
+ssize_t
 cifs_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 		unsigned long nr_segs, loff_t pos)
 {
-- 
1.6.6