All of lore.kernel.org
 help / color / mirror / Atom feed
From: Nick Piggin <npiggin@suse.de>
To: Linux Memory Management <linux-mm@kvack.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
	Linux Filesystems <linux-fsdevel@vger.kernel.org>,
	Nick Piggin <npiggin@suse.de>, Andrew Morton <akpm@osdl.org>
Subject: [patch 2/10] mm: revert "generic_file_buffered_write(): handle zero length iovec segments"
Date: Sat, 13 Jan 2007 04:24:33 +0100 (CET)	[thread overview]
Message-ID: <20070113011218.9449.4113.sendpatchset@linux.site> (raw)
In-Reply-To: <20070113011159.9449.4327.sendpatchset@linux.site>

From: Andrew Morton <akpm@osdl.org>

Revert 81b0c8713385ce1b1b9058e916edcf9561ad76d6.

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

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Nick Piggin <npiggin@suse.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;
 }

WARNING: multiple messages have this Message-ID (diff)
From: Nick Piggin <npiggin@suse.de>
From: Andrew Morton <akpm@osdl.org>
To: Linux Memory Management <linux-mm@kvack.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
	Linux Filesystems <linux-fsdevel@vger.kernel.org>,
	Nick Piggin <npiggin@suse.de>, Andrew Morton <akpm@osdl.org>
Subject: [patch 2/10] mm: revert "generic_file_buffered_write(): handle zero length iovec segments"
Date: Sat, 13 Jan 2007 04:24:33 +0100 (CET)	[thread overview]
Message-ID: <20070113011218.9449.4113.sendpatchset@linux.site> (raw)
In-Reply-To: <20070113011159.9449.4327.sendpatchset@linux.site>

Revert 81b0c8713385ce1b1b9058e916edcf9561ad76d6.

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

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Nick Piggin <npiggin@suse.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;
 }

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  parent reply	other threads:[~2007-01-13  3:24 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-13  3:24 [patch 0/10] buffered write deadlock fix Nick Piggin
2007-01-13  3:24 ` Nick Piggin
2007-01-13  3:24 ` [patch 1/10] fs: libfs buffered write leak fix Nick Piggin
2007-01-13  3:24   ` Nick Piggin
2007-01-13  3:24 ` Nick Piggin [this message]
2007-01-13  3:24   ` [patch 2/10] mm: revert "generic_file_buffered_write(): handle zero length iovec segments" Nick Piggin, Andrew Morton
2007-01-13  3:24 ` [patch 3/10] mm: revert "generic_file_buffered_write(): deadlock on vectored write" Nick Piggin
2007-01-13  3:24   ` Nick Piggin, Andrew Morton
2007-01-13  3:24 ` [patch 4/10] mm: generic_file_buffered_write cleanup Nick Piggin
2007-01-13  3:24   ` Nick Piggin, Andrew Morton
2007-01-13  3:25 ` [patch 5/10] mm: debug write deadlocks Nick Piggin
2007-01-13  3:25   ` Nick Piggin
2007-01-13  3:25 ` [patch 6/10] mm: be sure to trim blocks Nick Piggin
2007-01-13  3:25   ` Nick Piggin
2007-01-14 14:25   ` Dmitriy Monakhov
2007-01-14 14:25     ` Dmitriy Monakhov
2007-01-20  3:50     ` Nick Piggin
2007-01-20  3:50       ` Nick Piggin
2007-01-16 17:36   ` Peter Zijlstra
2007-01-16 17:36     ` Peter Zijlstra
2007-01-16 19:14     ` Peter Zijlstra
2007-01-16 19:14       ` Peter Zijlstra
2007-01-20  3:52       ` Nick Piggin
2007-01-20  3:52         ` Nick Piggin
2007-01-13  3:25 ` [patch 7/10] mm: cleanup pagecache insertion operations Nick Piggin
2007-01-13  3:25   ` Nick Piggin
2007-01-13  3:25 ` [patch 8/10] mm: generic_file_buffered_write cleanup more Nick Piggin
2007-01-13  3:25   ` Nick Piggin
2007-01-13  3:25 ` [patch 9/10] mm: generic_file_buffered_write iovec cleanup Nick Piggin
2007-01-13  3:25   ` Nick Piggin
2007-01-13  3:25 ` [patch 10/10] mm: fix pagecache write deadlocks Nick Piggin
2007-01-13  3:25   ` Nick Piggin
2007-01-14  3:59   ` Nick Piggin
2007-01-14  3:59     ` Nick Piggin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20070113011218.9449.4113.sendpatchset@linux.site \
    --to=npiggin@suse.de \
    --cc=akpm@osdl.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.