forked from luck/tmp_suning_uos_patched
[PATCH] drop_buffers() oops fix
In rare situations, drop_buffers() can be called for a page which has buffers, but no ->mapping (it was truncated, but the buffers were left behind because ext3 was still fiddling with them). But if there was an I/O error in a buffer_head, drop_buffers() will try to get at the address_space and will oops. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -2917,7 +2917,7 @@ drop_buffers(struct page *page, struct buffer_head **buffers_to_free)
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bh = head;
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do {
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if (buffer_write_io_error(bh))
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if (buffer_write_io_error(bh) && page->mapping)
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set_bit(AS_EIO, &page->mapping->flags);
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if (buffer_busy(bh))
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goto failed;
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