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Date: Fri, 1 Dec 2006 06:08:52 +0100
From: Nick Piggin <npiggin@...e.de>
To: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...l.org>, linux-fsdevel@...r.kernel.org
Subject: Re: [patch 3/3] fs: fix cont vs deadlock patches
On Fri, Dec 01, 2006 at 12:41:25PM +0900, OGAWA Hirofumi wrote:
>
> Yes, this patch doesn't pass zero-length to prepare_write. However,
> I'm not checking this patch is ok for reiserfs...
OK, vfat wasn't working correctly for me -- I needed the following patch:
Index: linux-2.6/fs/buffer.c
===================================================================
--- linux-2.6.orig/fs/buffer.c 2006-12-01 15:31:22.000000000 +1100
+++ linux-2.6/fs/buffer.c 2006-12-01 16:02:23.000000000 +1100
@@ -2102,6 +2102,7 @@
*bytes |= (blocksize-1);
(*bytes)++;
}
+
status = __block_prepare_write(inode, new_page, zerofrom,
PAGE_CACHE_SIZE, get_block);
if (status)
@@ -2110,7 +2111,7 @@
memset(kaddr+zerofrom, 0, PAGE_CACHE_SIZE-zerofrom);
flush_dcache_page(new_page);
kunmap_atomic(kaddr, KM_USER0);
- generic_commit_write(NULL, new_page, zerofrom, PAGE_CACHE_SIZE);
+ __block_commit_write(inode, new_page, zerofrom, PAGE_CACHE_SIZE);
unlock_page(new_page);
page_cache_release(new_page);
}
@@ -2142,6 +2143,7 @@
kunmap_atomic(kaddr, KM_USER0);
__block_commit_write(inode, page, zerofrom, offset);
}
+
return 0;
out1:
ClearPageUptodate(page);
Index: linux-2.6/fs/fat/inode.c
===================================================================
--- linux-2.6.orig/fs/fat/inode.c 2006-12-01 15:31:22.000000000 +1100
+++ linux-2.6/fs/fat/inode.c 2006-12-01 16:02:08.000000000 +1100
@@ -151,7 +151,8 @@
{
struct inode *inode = page->mapping->host;
int err;
- if (to - from > 0)
+
+ if (to - from == 0)
return 0;
err = generic_commit_write(file, page, from, to);
And reiserfs has some creative uses of generic_cont_expand, which I
think I've fixed in the following way. I'll send out the full patch
if you (and others) agree with the changes.
Index: linux-2.6/fs/reiserfs/file.c
===================================================================
--- linux-2.6.orig/fs/reiserfs/file.c 2006-12-01 16:01:17.000000000 +1100
+++ linux-2.6/fs/reiserfs/file.c 2006-12-01 16:03:34.000000000 +1100
@@ -892,6 +892,34 @@
return retval;
}
+static int reiserfs_convert_tail(struct inode *inode, loff_t offset)
+{
+ struct address_space *mapping = inode->i_mapping;
+ pgoff_t index;
+ struct page *page;
+ int err = -ENOMEM;
+
+ index = offset >> PAGE_CACHE_SHIFT;
+ page = grab_cache_page(mapping, index);
+ if (!page)
+ goto out;
+
+ offset = offset & ~PAGE_CACHE_MASK;
+ WARN_ON(!offset); /* shouldn't pass zero length to prepare/commit */
+
+ err = mapping->a_ops->prepare_write(NULL, page, 0, offset);
+ if (err)
+ goto out_unlock;
+
+ err = mapping->a_ops->commit_write(NULL, page, 0, offset);
+
+out_unlock:
+ unlock_page(page);
+ page_cache_release(page);
+out:
+ return err;
+}
+
/* Look if passed writing region is going to touch file's tail
(if it is present). And if it is, convert the tail to unformatted node */
static int reiserfs_check_for_tail_and_convert(struct inode *inode, /* inode to deal with */
@@ -937,7 +965,8 @@
le_key_k_offset(get_inode_item_key_version(inode),
&(ih->ih_key));
pathrelse(&path);
- res = generic_cont_expand(inode, cont_expand_offset);
+
+ res = reiserfs_convert_tail(inode, cont_expand_offset);
} else
pathrelse(&path);
-
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