Commit d54cdc8c authored Feb 01, 2011 by Josef Bacik Committed by Linus Torvalds Feb 02, 2011

fs: make block fiemap mapping length at least blocksize long

Some filesystems don't deal well with being asked to map less than
blocksize blocks (GFS2 for example).  Since we are always mapping at least
blocksize sections anyway, just make sure len is at least as big as a
blocksize so we don't trip up any filesystems.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 3cd90ea4

fs/ioctl.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -273,6 +273,13 @@ int __generic_block_fiemap(struct inode *inode,
		len = isize;
		}

		/*
		* Some filesystems can't deal with being asked to map less than
		* blocksize, so make sure our len is at least block length.
		*/
		if (logical_to_blk(inode, len) == 0)
		len = blk_to_logical(inode, 1);

		start_blk = logical_to_blk(inode, start);
		last_blk = logical_to_blk(inode, start + len - 1);

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