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--- 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(¤t->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(¤t->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)
|
