__generic_block_fiemap may spin very long time for large sparse files.

Signed-off-by: Dmitry Monakhov <dmonak...@openvz.org>
---
 fs/ioctl.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 8ac3fad..6fbeb68 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -379,6 +379,11 @@ int __generic_block_fiemap(struct inode *inode,
                                past_eof = true;
                }
                cond_resched();
+               if (fatal_signal_pending(current)) {
+                       ret = -EINTR;
+                       break;
+               }
+
        } while (1);
 
        /* If ret is 1 then we just hit the end of the extent array */
-- 
1.7.1

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