brcm47xx: add preliminary 2.6.34 support

[openwrt.git] / target / linux / brcm47xx / patches-2.6.34 / 302-kmod-fuse-dcache-bug-fuse.patch

diff --git a/target/linux/brcm47xx/patches-2.6.34/302-kmod-fuse-dcache-bug-fuse.patch b/target/linux/brcm47xx/patches-2.6.34/302-kmod-fuse-dcache-bug-fuse.patch
new file mode 100644 (file)
index 0000000..d6c0b3a
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.34/302-kmod-fuse-dcache-bug-fuse.patch
@@ -0,0 +1,82 @@
+--- 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)