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Date: Wed, 20 Jun 2012 14:01:28 -0400 From: Jeff Moyer <jmoyer@...hat.com> To: Jens Axboe <jaxboe@...ionio.com>, linux-kernel@...r.kernel.org Cc: stable@...r.kernel.org, torsten.hilbrich@...unet.com, Nick Piggin <npiggin@...nel.dk> Subject: [patch] block: fix off-by-one in init_page_buffers Hi, This commit: commit 080399aaaf3531f5b8761ec0ac30ff98891e8686 Author: Jeff Moyer <jmoyer@...hat.com> Date: Fri May 11 16:34:10 2012 +0200 block: don't mark buffers beyond end of disk as mapped introduced a bug whereby the last block on the device was treated as beyond the end of the device. This causes the mount program to hang when trying to (erroneously) mount an extended partition, as reported by Torsten Hilbrich here: https://lkml.org/lkml/2012/6/18/54, and also reported independently here: http://www.sysresccd.org/forums/viewtopic.php?f=13&t=4511. The attached patch was tested by myself and Torsten and found to resolve the problem. I also instrumented the init_page_buffers routine to ensure that the end_block is indeed the last block of the device. Comments, as always, are appreciated. -- This needs backporting to the stable trees where the offending commit was backported. I'm sure that includes 3.0 and 3.3, but not sure where else it was committed. Is there an easy way to tell what trees got the commit? CC: stable@...r.kernel.org, npiggin@...nel.dk Reported-and-Tested-by: Torsten Hilbrich <torsten.hilbrich@...unet.com> Signed-off-by: Jeff Moyer <jmoyer@...hat.com> diff --git a/fs/buffer.c b/fs/buffer.c index 838a9cf..769b30b 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -930,7 +930,7 @@ init_page_buffers(struct page *page, struct block_device *bdev, bh->b_blocknr = block; if (uptodate) set_buffer_uptodate(bh); - if (block < end_block) + if (block <= end_block) set_buffer_mapped(bh); } block++; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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