Commit 8c581651 authored by Monakhov Dmitriy's avatar Monakhov Dmitriy Committed by Linus Torvalds
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[PATCH] D-cache aliasing issue in __block_prepare_write 



A couple of flush_dcache_page()s are missing on the I/O-error paths.

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 97e860d3

fs/buffer.c

+2 −0
Original line number Diff line number Diff line
@@ -1854,6 +1854,7 @@ static int __block_prepare_write(struct inode *inode, struct page *page, 
			clear_buffer_new(bh);

			kaddr = kmap_atomic(page, KM_USER0);

			memset(kaddr+block_start, 0, bh->b_size);

			flush_dcache_page(page);

			kunmap_atomic(kaddr, KM_USER0);

			set_buffer_uptodate(bh);

			mark_buffer_dirty(bh);
@@ -2360,6 +2361,7 @@ int nobh_prepare_write(struct page *page, unsigned from, unsigned to, 
	 */

	kaddr = kmap_atomic(page, KM_USER0);

	memset(kaddr, 0, PAGE_CACHE_SIZE);

	flush_dcache_page(page);

	kunmap_atomic(kaddr, KM_USER0);

	SetPageUptodate(page);

	set_page_dirty(page);