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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>
This commit is contained in:
Pavel Shilovsky 2010-12-14 11:29:51 +03:00 committed by Steve French
parent 8be7e6ba14
commit 7a6a19b17a
3 changed files with 18 additions and 2 deletions
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4
fs/cifs/cifsfs.c
View File

@ -743,7 +743,7 @@ 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
@ -798,7 +798,7 @@ 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

1
fs/cifs/cifsfs.h
View File

@ -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);

15
fs/cifs/file.c
View File

@ -1769,6 +1769,21 @@ 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;