linux-kernel - [patch 2/9] mm: revert "generic_file_buffered_write(): handle zero length iovec segments"

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Message-Id: <20070129081923.23584.6054.sendpatchset@linux.site>
Date:	Mon, 29 Jan 2007 11:31:56 +0100 (CET)
From:	Nick Piggin <npiggin@...e.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Filesystems <linux-fsdevel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Memory Management <linux-mm@...ck.org>
Subject: [patch 2/9] mm: revert "generic_file_buffered_write(): handle zero length iovec segments"

From: Andrew Morton <akpm@...l.org>

Revert 81b0c8713385ce1b1b9058e916edcf9561ad76d6.

This was a bugfix against 6527c2bdf1f833cc18e8f42bd97973d583e4aa83, which we
also revert.

Signed-off-by: Andrew Morton <akpm@...l.org>
Signed-off-by: Nick Piggin <npiggin@...e.de>

Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -1911,12 +1911,6 @@ generic_file_buffered_write(struct kiocb
 			break;
 		}
 
-		if (unlikely(bytes == 0)) {
-			status = 0;
-			copied = 0;
-			goto zero_length_segment;
-		}
-
 		status = a_ops->prepare_write(file, page, offset, offset+bytes);
 		if (unlikely(status)) {
 			loff_t isize = i_size_read(inode);
@@ -1946,8 +1940,7 @@ generic_file_buffered_write(struct kiocb
 			page_cache_release(page);
 			continue;
 		}
-zero_length_segment:
-		if (likely(copied >= 0)) {
+		if (likely(copied > 0)) {
 			if (!status)
 				status = copied;
 
Index: linux-2.6/mm/filemap.h
===================================================================
--- linux-2.6.orig/mm/filemap.h
+++ linux-2.6/mm/filemap.h
@@ -87,7 +87,7 @@ filemap_set_next_iovec(const struct iove
 	const struct iovec *iov = *iovp;
 	size_t base = *basep;
 
-	do {
+	while (bytes) {
 		int copy = min(bytes, iov->iov_len - base);
 
 		bytes -= copy;
@@ -96,7 +96,7 @@ filemap_set_next_iovec(const struct iove
 			iov++;
 			base = 0;
 		}
-	} while (bytes);
+	}
 	*iovp = iov;
 	*basep = base;
 }
-
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