[Ocfs2-devel] [Patch] fix bug 123 - dead lock when truncate

[Ling, Xiaofeng]

In the call stack
ocfs_setattr ->
ocfs2_zero_extend->ocfs_get_block->ocfs_lookup_file_allocation
There are two down_write(&OCFS_I(inode)->ip_io_sem)
file.c +1549
alloc.c +4179

------------------------------------------------------------------------
------------------------------------------
Index: file.c
===================================================================
--- file.c  (revision 1370)
+++ file.c  (working copy)
@@ -1471,7 +1471,9 @@
            OCFS_I(inode)->ip_mmu_private = inode->i_size;
        }
        up (&(OCFS_I(inode)->ip_sem));
+       up_write(&OCFS_I(inode)->ip_io_sem);
        status = ocfs2_zero_extend(inode);
+       down_write(&OCFS_I(inode)->ip_io_sem);
        if (status < 0) {
            LOG_ERROR_STATUS(status);
            goto bail;

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