From: Nathan Scott <nathans@sgi.com>
Date: Thu, 28 Sep 2006 01:03:13 +0000 (+1000)
Subject: [XFS] Be more defensive with page flags (error/private) for metadata
X-Git-Tag: firefly_0821_release~33027^2~20
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=948ecdb4c118293d2f3e267eec642c30c5d3a056;p=firefly-linux-kernel-4.4.55.git

[XFS] Be more defensive with page flags (error/private) for metadata
buffers.

SGI-PV: 955302
SGI-Modid: xfs-linux-melb:xfs-kern:26801a

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
---

diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 58b6599de619..9bbadafdcb00 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -318,8 +318,12 @@ xfs_buf_free(
 		if ((bp->b_flags & XBF_MAPPED) && (bp->b_page_count > 1))
 			free_address(bp->b_addr - bp->b_offset);
 
-		for (i = 0; i < bp->b_page_count; i++)
-			page_cache_release(bp->b_pages[i]);
+		for (i = 0; i < bp->b_page_count; i++) {
+			struct page	*page = bp->b_pages[i];
+
+			ASSERT(!PagePrivate(page));
+			page_cache_release(page);
+		}
 		_xfs_buf_free_pages(bp);
 	} else if (bp->b_flags & _XBF_KMEM_ALLOC) {
 		 /*
@@ -400,6 +404,7 @@ _xfs_buf_lookup_pages(
 		nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset);
 		size -= nbytes;
 
+		ASSERT(!PagePrivate(page));
 		if (!PageUptodate(page)) {
 			page_count--;
 			if (blocksize >= PAGE_CACHE_SIZE) {
@@ -1117,10 +1122,10 @@ xfs_buf_bio_end_io(
 	do {
 		struct page	*page = bvec->bv_page;
 
+		ASSERT(!PagePrivate(page));
 		if (unlikely(bp->b_error)) {
 			if (bp->b_flags & XBF_READ)
 				ClearPageUptodate(page);
-			SetPageError(page);
 		} else if (blocksize >= PAGE_CACHE_SIZE) {
 			SetPageUptodate(page);
 		} else if (!PagePrivate(page) &&