cifs: Allow directIO read/write during cache=strict

Currently cifs have all or nothing approach for directIO operations.
cache=strict mode does not allow directIO while cache=none mode performs
all the operations as directIO even when user does not specify O_DIRECT
flag. This patch enables strict cache mode to honour directIO semantics.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
Signed-off-by: Steve French <smfrench@gmail.com>

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 3db0c5f..6cbd9c6 100644 (file)
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -497,6 +497,14 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry,
                goto out;
        }
 
+       if (file->f_flags & O_DIRECT &&
+           CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+               if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+                       file->f_op = &cifs_file_direct_nobrl_ops;
+               else
+                       file->f_op = &cifs_file_direct_ops;
+               }
+
        file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
        if (file_info == NULL) {
                if (server->ops->close)

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index d5fec92..7c018a1 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -467,6 +467,14 @@ int cifs_open(struct inode *inode, struct file *file)
        cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n",
                 inode, file->f_flags, full_path);
 
+       if (file->f_flags & O_DIRECT &&
+           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+               if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+                       file->f_op = &cifs_file_direct_nobrl_ops;
+               else
+                       file->f_op = &cifs_file_direct_ops;
+       }
+
        if (server->oplocks)
                oplock = REQ_OPLOCK;
        else