[PATCH 4/7] CIFS: Implement cifs_file_strict_mmap

[Pavel Shilovsky]

Invalidate inode if we don't have at least Level II oplock.

Signed-off-by: Pavel Shilovsky <piastr...@gmail.com>
---
 fs/cifs/file.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 938f26a..dd1e59a 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1829,8 +1829,16 @@ static ssize_t cifs_read(struct file *file, char 
*read_data, size_t read_size,
 
 int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
 {
-       int rc = 0;
-       /* BB */
+       int rc, xid;
+       struct inode *inode = file->f_path.dentry->d_inode;
+
+       xid = GetXid();
+
+       if (!CIFS_I(inode)->clientCanCacheRead)
+               cifs_invalidate_mapping(inode);
+
+       rc = generic_file_mmap(file, vma);
+       FreeXid(xid);
        return rc;
 }
 
@@ -1839,12 +1847,14 @@ int cifs_file_mmap(struct file *file, struct 
vm_area_struct *vma)
        int rc, xid;
 
        xid = GetXid();
+
        rc = cifs_revalidate_file(file);
        if (rc) {
                cFYI(1, "Validation prior to mmap failed, error=%d", rc);
                FreeXid(xid);
                return rc;
        }
+
        rc = generic_file_mmap(file, vma);
        FreeXid(xid);
        return rc;
-- 
1.7.3.2

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