CIFS: Implement cifs_file_strict_mmap (try #2)
Invalidate inode mapping if we don't have at least Level II oplock.
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index f6093e4..e24d966 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -743,7 +743,7 @@
.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
@@ -798,7 +798,7 @@
.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 10c4303..710072e 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -89,6 +89,7 @@
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 5790fab7..0b32377 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1769,6 +1769,21 @@
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;