linux-kernel - [patch] new aop loop fix

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Message-ID: <20070613134631.GB13815@localhost.sw.ru>
Date:	Wed, 13 Jun 2007 17:46:31 +0400
From:	Dmitriy Monakhov <dmonakhov@...ru>
To:	linux-kernel@...r.kernel.org
Cc:	npiggin@...e.de, mark.fasheh@...cle.com, linux-ext4@...r.kernel.org
Subject: [patch] new aop loop fix

	loop.c code itself is not perfect. In fact before Nick's patch
	partial write was't possible. Assumption what write chunks are
	always page aligned is realy weird ( see "index++" line).

Signed-off-by: Dmitriy Monakhov <dmonakhov@...nvz.org>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 4bab9b1..8726da5 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -215,7 +215,6 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
 	int len, ret;
 
 	mutex_lock(&mapping->host->i_mutex);
-	index = pos >> PAGE_CACHE_SHIFT;
 	offset = pos & ((pgoff_t)PAGE_CACHE_SIZE - 1);
 	bv_offs = bvec->bv_offset;
 	len = bvec->bv_len;
@@ -226,6 +225,7 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
 		struct page *page;
 		void *fsdata;
 
+		index = pos >> PAGE_CACHE_SHIFT;
 		IV = ((sector_t)index << (PAGE_CACHE_SHIFT - 9))+(offset >> 9);
 		size = PAGE_CACHE_SIZE - offset;
 		if (size > len)
@@ -255,7 +255,6 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
 		bv_offs += copied;
 		len -= copied;
 		offset = 0;
-		index++;
 		pos += copied;
 	}
 	ret = 0;

> 
> 

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