From: Linus Torvalds Date: Thu, 29 Nov 2012 18:21:43 +0000 (-0800) Subject: fs/buffer.c: make block-size be per-page and protected by the page lock X-Git-Tag: v3.7-rc8~5^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=45bce8f3e3436bbe2e03dd2b076abdce79ffabb7;p=pandora-kernel.git fs/buffer.c: make block-size be per-page and protected by the page lock This makes the buffer size handling be a per-page thing, which allows us to not have to worry about locking too much when changing the buffer size. If a page doesn't have buffers, we still need to read the block size from the inode, but we can do that with ACCESS_ONCE(), so that even if the size is changing, we get a consistent value. This doesn't convert all functions - many of the buffer functions are used purely by filesystems, which in turn results in the buffer size being fixed at mount-time. So they don't have the same consistency issues that the raw device access can have. Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed