[PATCH 3/6] CIFS: Implement cifs_file_strict_mmap (try #2)

[Pavel Shilovsky]

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

Signed-off-by: Pavel Shilovsky <piastr...@gmail.com>
---
 fs/cifs/cifsfs.c |    4 ++--
 fs/cifs/cifsfs.h |    1 +
 fs/cifs/file.c   |   15 +++++++++++++++
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 7660133..a218afe 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -720,7 +720,7 @@ const struct file_operations cifs_file_strict_ops = {
        .lock = cifs_lock,
        .fsync = cifs_strict_fsync,
        .flush = cifs_flush,
-       .mmap = cifs_file_mmap,
+       .mmap = cifs_file_strict_mmap,
        .splice_read = generic_file_splice_read,
        .llseek = cifs_llseek,
 #ifdef CONFIG_CIFS_POSIX
@@ -775,7 +775,7 @@ const struct file_operations cifs_file_strict_nobrl_ops = {
        .release = cifs_close,
        .fsync = cifs_strict_fsync,
        .flush = cifs_flush,
-       .mmap = cifs_file_mmap,
+       .mmap = cifs_file_strict_mmap,
        .splice_read = generic_file_splice_read,
        .llseek = cifs_llseek,
 #ifdef CONFIG_CIFS_POSIX
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 8584829..657738f 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -89,6 +89,7 @@ extern int cifs_fsync(struct file *, int);
 extern int cifs_strict_fsync(struct file *, int);
 extern int cifs_flush(struct file *, fl_owner_t id);
 extern int cifs_file_mmap(struct file * , struct vm_area_struct *);
+extern int cifs_file_strict_mmap(struct file * , struct vm_area_struct *);
 extern const struct file_operations cifs_dir_ops;
 extern int cifs_dir_open(struct inode *inode, struct file *file);
 extern int cifs_readdir(struct file *file, void *direntry, filldir_t filldir);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 4e37cb8..d48723c 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1827,6 +1827,21 @@ static ssize_t cifs_read(struct file *file, char 
*read_data, size_t read_size,
        return total_read;
 }
 
+int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
+{
+       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;
+}
+
 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
        int rc, xid;
-- 
1.7.3.2

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