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ocfs2: Turn off shared writeable mmap for local files systems with holes. 

This will be turned back on once we can do allocation in ->page_mkwrite().

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
hifive-unleashed-5.1
Mark Fasheh 2007-01-17 13:10:55 -08:00
parent abf8b15694
commit 89488984ac
1 changed files with 5 additions and 2 deletions
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7
fs/ocfs2/mmap.c
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@ -85,8 +85,11 @@ int ocfs2_mmap(struct file *file, struct vm_area_struct *vma)
int ret = 0, lock_level = 0;
struct ocfs2_super *osb = OCFS2_SB(file->f_dentry->d_inode->i_sb);
/* We don't want to support shared writable mappings yet. */
if (!ocfs2_mount_local(osb) &&
/*
* Only support shared writeable mmap for local mounts which
* don't know about holes.
*/
if ((!ocfs2_mount_local(osb) || ocfs2_sparse_alloc(osb)) &&
((vma->vm_flags & VM_SHARED) || (vma->vm_flags & VM_MAYSHARE)) &&
((vma->vm_flags & VM_WRITE) || (vma->vm_flags & VM_MAYWRITE))) {
mlog(0, "disallow shared writable mmaps %lx\n", vma->vm_flags);