【openEuler-1.0-LTS】fuse: revalidate: don't invalidate if interrupted

LTS 补丁回合：

00260209e140a fuse: revalidate: don't invalidate if interrupted

If the LOOKUP request triggered from fuse_dentry_revalidate() is
interrupted, then the dentry will be invalidated, possibly resulting in
submounts being unmounted.

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 6098e0c7f87b..0e03adbcf942 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -232,7 +232,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
spin_unlock(&fc->lock);
}
kfree(forget);

```
          if (ret == -ENOMEM)
```

          if (ret == -ENOMEM || ret == -EINTR)
                  goto out;
          if (ret || fuse_invalid_attr(&outarg.attr) ||
              (outarg.attr.mode ^ inode->i_mode) & S_IFMT)

lookup_fast/slow
d_revalidate
fuse_simple_request
fuse_request_send
request_wait_answer
# 如果返回-EINTR
goto invalid; # reuturn 0;
......
# 如果d_revalidate返回0
d_invalidate
detach_mounts # 可能导致卸载 bind mounted
__detach_mounts

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GVP openEuler / kernel

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GVPopenEuler / kernel

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