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

   1 --- a/fs/fuse/dev.c
   2 +++ b/fs/fuse/dev.c
   3 @@ -533,6 +533,11 @@ static void fuse_copy_finish(struct fuse
   4         }
   5  }
   6
   7 +#ifdef DCACHE_BUG
   8 +extern void (*fuse_flush_cache_all)(void);
   9 +extern void (*fuse_flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
  10 +#endif
  11 +
  12  /*
  13   * Get another pagefull of userspace buffer, and map it to kernel
  14   * address space, and lock request
  15 @@ -541,6 +546,9 @@ static int fuse_copy_fill(struct fuse_co
  16  {
  17         unsigned long offset;
  18         int err;
  19 +#ifdef DCACHE_BUG
  20 +       struct vm_area_struct *vma;
  21 +#endif
  22
  23         unlock_request(cs->fc, cs->req);
  24         fuse_copy_finish(cs);
  25 @@ -552,14 +560,22 @@ static int fuse_copy_fill(struct fuse_co
  26                 cs->nr_segs--;
  27         }
  28         down_read(&current->mm->mmap_sem);
  29 +#ifndef DCACHE_BUG
  30         err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0,
  31                              &cs->pg, NULL);
  32 +#else
  33 +       err = get_user_pages(current, current->mm, cs->addr, 1, cs->write, 0,
  34 +                            &cs->pg, &vma);
  35 +#endif
  36         up_read(&current->mm->mmap_sem);
  37         if (err < 0)
  38                 return err;
  39         BUG_ON(err != 1);
  40         offset = cs->addr % PAGE_SIZE;
  41         cs->mapaddr = kmap_atomic(cs->pg, KM_USER0);
  42 +#ifdef DCACHE_BUG
  43 +       fuse_flush_cache_page(vma, cs->addr, page_to_pfn(cs->pg));
  44 +#endif
  45         cs->buf = cs->mapaddr + offset;
  46         cs->len = min(PAGE_SIZE - offset, cs->seglen);
  47         cs->seglen -= cs->len;
  48 @@ -573,6 +589,11 @@ static int fuse_copy_do(struct fuse_copy
  49  {
  50         unsigned ncpy = min(*size, cs->len);
  51         if (val) {
  52 +#ifdef DCACHE_BUG
  53 +               // patch from mailing list, it is very important, otherwise,
  54 +               // can't mount, or ls mount point will hang
  55 +               fuse_flush_cache_all();
  56 +#endif
  57                 if (cs->write)
  58                         memcpy(cs->buf, *val, ncpy);
  59                 else
  60 --- a/fs/fuse/fuse_i.h
  61 +++ b/fs/fuse/fuse_i.h
  62 @@ -8,6 +8,7 @@
  63
  64  #ifndef _FS_FUSE_I_H
  65  #define _FS_FUSE_I_H
  66 +#define DCACHE_BUG
  67
  68  #include <linux/fuse.h>
  69  #include <linux/fs.h>
  70 --- a/fs/fuse/inode.c
  71 +++ b/fs/fuse/inode.c
  72 @@ -1201,6 +1201,10 @@ static int __init fuse_init(void)
  73         printk(KERN_INFO "fuse init (API version %i.%i)\n",
  74                FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
  75
  76 +#ifdef DCACHE_BUG
  77 +printk("fuse init: DCACHE_BUG enabled\n");
  78 +#endif
  79 +
  80         INIT_LIST_HEAD(&fuse_conn_list);
  81         res = fuse_fs_init();
  82         if (res)