add patches to workaround dcache realted fuse problems (#5186)

SVN-Revision: 16412

target/linux/brcm47xx/patches-2.6.28/301-kmod-fuse-dcache-bug-r4k.patch

@@ -0,0 +1,31 @@
+--- linux-2.6.28.10.orig/arch/mips/mm/c-r4k.c	2009-05-02 20:54:43.000000000 +0200
++++ linux-2.6.28.10/arch/mips/mm/c-r4k.c	2009-06-07 20:36:01.667918000 +0200
+@@ -348,7 +348,7 @@
+ 	}
+ }
+ 
+-static void r4k___flush_cache_all(void)
++void r4k___flush_cache_all(void)
+ {
+ 	r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1);
+ }
+@@ -512,7 +512,7 @@
+ 	}
+ }
+ 
+-static void r4k_flush_cache_page(struct vm_area_struct *vma,
++void r4k_flush_cache_page(struct vm_area_struct *vma,
+ 	unsigned long addr, unsigned long pfn)
+ {
+ 	struct flush_cache_page_args args;
+@@ -1401,3 +1401,10 @@
+ #endif
+ 	coherency_setup();
+ }
++
++// fuse package DCACHE BUG patch exports
++void (*fuse_flush_cache_all)(void) = r4k___flush_cache_all;
++void (*fuse_flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
++        unsigned long pfn) = r4k_flush_cache_page;
++EXPORT_SYMBOL(fuse_flush_cache_page);
++EXPORT_SYMBOL(fuse_flush_cache_all);

target/linux/brcm47xx/patches-2.6.28/302-kmod-fuse-dcache-bug-fuse.patch

@@ -0,0 +1,85 @@
+diff -ru linux-2.6.28.10.orig/fs/fuse/dev.c linux-2.6.28.10/fs/fuse/dev.c
+--- linux-2.6.28.10.orig/fs/fuse/dev.c	2009-05-02 20:54:43.000000000 +0200
++++ linux-2.6.28.10/fs/fuse/dev.c	2009-06-07 20:29:50.229816000 +0200
+@@ -525,6 +525,11 @@
+ 	}
+ }
+ 
++#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
+@@ -533,6 +538,9 @@
+ {
+ 	unsigned long offset;
+ 	int err;
++#ifdef DCACHE_BUG
++	struct vm_area_struct *vma;
++#endif
+ 
+ 	unlock_request(cs->fc, cs->req);
+ 	fuse_copy_finish(cs);
+@@ -544,14 +552,22 @@
+ 		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;
+@@ -565,6 +581,11 @@
+ {
+ 	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
+diff -ru linux-2.6.28.10.orig/fs/fuse/fuse_i.h linux-2.6.28.10/fs/fuse/fuse_i.h
+--- linux-2.6.28.10.orig/fs/fuse/fuse_i.h	2009-05-02 20:54:43.000000000 +0200
++++ linux-2.6.28.10/fs/fuse/fuse_i.h	2009-06-06 16:34:54.814468000 +0200
+@@ -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>
+diff -ru linux-2.6.28.10.orig/fs/fuse/inode.c linux-2.6.28.10/fs/fuse/inode.c
+--- linux-2.6.28.10.orig/fs/fuse/inode.c	2009-05-02 20:54:43.000000000 +0200
++++ linux-2.6.28.10/fs/fuse/inode.c	2009-06-07 20:33:34.156611000 +0200
+@@ -1038,6 +1038,10 @@
+ 	printk("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)