openwrt-xburst/target/linux/brcm47xx/patches-2.6.32/302-kmod-fuse-dcache-bug-fuse.patch

--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -533,6 +533,11 @@ static void fuse_copy_finish(struct fuse
 	}
 }
 
+#ifdef DCACHE_BUG
+extern void (*fuse_flush_cache_all)(void);
+extern void (*fuse_flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
+#endif
+
 /*
  * Get another pagefull of userspace buffer, and map it to kernel
  * address space, and lock request
@@ -541,6 +546,9 @@ static int fuse_copy_fill(struct fuse_co
 {
 	unsigned long offset;
 	int err;
+#ifdef DCACHE_BUG
+	struct vm_area_struct *vma;
+#endif
 
 	unlock_request(cs->fc, cs->req);
 	fuse_copy_finish(cs);
@@ -552,14 +560,22 @@ static int fuse_copy_fill(struct fuse_co
 		cs->nr_segs--;
 	}
 	down_read(&current->mm->mmap_sem);
+#ifndef DCACHE_BUG
 	err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0,
 			     &cs->pg, NULL);
+#else
+	err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0,
+			     &cs->pg, &vma);
+#endif
 	up_read(&current->mm->mmap_sem);
 	if (err < 0)
 		return err;
 	BUG_ON(err != 1);
 	offset = cs->addr % PAGE_SIZE;
 	cs->mapaddr = kmap_atomic(cs->pg, KM_USER0);
+#ifdef DCACHE_BUG
+	fuse_flush_cache_page(vma, cs->addr, page_to_pfn(cs->pg));
+#endif
 	cs->buf = cs->mapaddr + offset;
 	cs->len = min(PAGE_SIZE - offset, cs->seglen);
 	cs->seglen -= cs->len;
@@ -573,6 +589,11 @@ static int fuse_copy_do(struct fuse_copy
 {
 	unsigned ncpy = min(*size, cs->len);
 	if (val) {
+#ifdef DCACHE_BUG
+		// patch from mailing list, it is very important, otherwise,
+		// can't mount, or ls mount point will hang
+		fuse_flush_cache_all();
+#endif
 		if (cs->write)
 			memcpy(cs->buf, *val, ncpy);
 		else
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -8,6 +8,7 @@
 
 #ifndef _FS_FUSE_I_H
 #define _FS_FUSE_I_H
+#define DCACHE_BUG
 
 #include <linux/fuse.h>
 #include <linux/fs.h>
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1201,6 +1201,10 @@ static int __init fuse_init(void)
 	printk(KERN_INFO "fuse init (API version %i.%i)\n",
 	       FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
 
+#ifdef DCACHE_BUG
+printk("fuse init: DCACHE_BUG enabled\n");
+#endif
+
 	INIT_LIST_HEAD(&fuse_conn_list);
 	res = fuse_fs_init();
 	if (res)