* XXX: Huge page cache doesn't support writing yet. Drop all page
* cache for this file before processing writes.
*/
- if ((f->f_mode & FMODE_WRITE) && filemap_nr_thps(inode->i_mapping))
- truncate_pagecache(inode, 0);
+ if (f->f_mode & FMODE_WRITE) {
+ /*
+ * Paired with smp_mb() in collapse_file() to ensure nr_thps
+ * is up to date and the update to i_writecount by
+ * get_write_access() is visible. Ensures subsequent insertion
+ * of THPs into the page cache will fail.
+ */
+ smp_mb();
+ if (filemap_nr_thps(inode->i_mapping))
+ truncate_pagecache(inode, 0);
+ }
return 0;
}
EXPORT_SYMBOL(filp_open);
-struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
+struct file *file_open_root(const struct path *root,
const char *filename, int flags, umode_t mode)
{
struct open_flags op;
int err = build_open_flags(&how, &op);
if (err)
return ERR_PTR(err);
- return do_file_open_root(dentry, mnt, filename, &op);
+ return do_file_open_root(root, filename, &op);
}
EXPORT_SYMBOL(file_open_root);