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