[PATCH] fix garbage instead of zeroes in UFS

Looks like this is the problem, which point Al Viro some time ago:

ufs's get_block callback allocates 16k of disk at a time, and links that
entire 16k into the file's metadata. But because get_block is called for only
a single buffer_head (a 2k buffer_head in this case?) we are only able to tell
the VFS that this 2k is buffer_new().

So when ufs_getfrag_block() is later called to map some more data in the file,
and when that data resides within the remaining 14k of this fragment,
ufs_getfrag_block() will incorrectly return a !buffer_new() buffer_head.

I don't see _right_ way to do nullification of whole block, if use inode
page cache, some pages may be outside of inode limits (inode size), and
will be lost; if use blockdev page cache it is possible to zero real data,
if later inode page cache will be used.

The simpliest way, as can I see usage of block device page cache, but not only
mark dirty, but also sync it during "nullification". I use my simple tests
collection, which I used for check that create,open,write,read,close works on
ufs, and I see that this patch makes ufs code 18% slower then before.

Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/ufs/balloc.c

···
 	UFSD("EXIT\n");
 }
 
+static void ufs_clear_frags(struct inode *inode, sector_t beg, unsigned int n,
+			    int sync)
+{
+	struct buffer_head *bh;
+	sector_t end = beg + n;
+
+	for (; beg < end; ++beg) {
+		bh = sb_getblk(inode->i_sb, beg);
+		lock_buffer(bh);
+		memset(bh->b_data, 0, inode->i_sb->s_blocksize);
+		set_buffer_uptodate(bh);
+		mark_buffer_dirty(bh);
+		unlock_buffer(bh);
+		if (IS_SYNC(inode) || sync)
+			sync_dirty_buffer(bh);
+		brelse(bh);
+	}
+}
+
 unsigned ufs_new_fragments(struct inode * inode, __fs32 * p, unsigned fragment,
 			   unsigned goal, unsigned count, int * err, struct page *locked_page)
 {
···
 			*p = cpu_to_fs32(sb, result);
 			*err = 0;
 			UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
+			ufs_clear_frags(inode, result + oldcount, newcount - oldcount,
+					locked_page != NULL);
 		}
 		unlock_super(sb);
 		UFSD("EXIT, result %u\n", result);
···
 	if (result) {
 		*err = 0;
 		UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
+		ufs_clear_frags(inode, result + oldcount, newcount - oldcount,
+				locked_page != NULL);
 		unlock_super(sb);
 		UFSD("EXIT, result %u\n", result);
 		return result;
···
 		*p = cpu_to_fs32(sb, result);
 		*err = 0;
 		UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
+		ufs_clear_frags(inode, result + oldcount, newcount - oldcount,
+				locked_page != NULL);
 		unlock_super(sb);
 		if (newcount < request)
 			ufs_free_fragments (inode, result + newcount, request - newcount);

fs/ufs/inode.c

···
 	return ret;
 }
 
-static void ufs_clear_frag(struct inode *inode, struct buffer_head *bh)
-{
-	lock_buffer(bh);
-	memset(bh->b_data, 0, inode->i_sb->s_blocksize);
-	set_buffer_uptodate(bh);
-	mark_buffer_dirty(bh);
-	unlock_buffer(bh);
-	if (IS_SYNC(inode))
-		sync_dirty_buffer(bh);
-}
-
-static struct buffer_head *
-ufs_clear_frags(struct inode *inode, sector_t beg,
-		unsigned int n, sector_t want)
-{
-	struct buffer_head *res = NULL, *bh;
-	sector_t end = beg + n;
-
-	for (; beg < end; ++beg) {
-		bh = sb_getblk(inode->i_sb, beg);
-		ufs_clear_frag(inode, bh);
-		if (want != beg)
-			brelse(bh);
-		else
-			res = bh;
-	}
-	BUG_ON(!res);
-	return res;
-}
-
 /**
  * ufs_inode_getfrag() - allocate new fragment(s)
  * @inode - pointer to inode
···
 	}
 
 	if (!phys) {
-		result = ufs_clear_frags(inode, tmp, required, tmp + blockoff);
+		result = sb_getblk(sb, tmp + blockoff);
 	} else {
 		*phys = tmp + blockoff;
 		result = NULL;
···
 
 
 	if (!phys) {
-		result = ufs_clear_frags(inode, tmp, uspi->s_fpb,
-					 tmp + blockoff);
+		result = sb_getblk(sb, tmp + blockoff);
 	} else {
 		*phys = tmp + blockoff;
 		*new = 1;
···
 #define GET_INODE_DATABLOCK(x) \
 	ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new, bh_result->b_page)
 #define GET_INODE_PTR(x) \
-	ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL, bh_result->b_page)
+	ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL, NULL)
 #define GET_INDIRECT_DATABLOCK(x) \
 	ufs_inode_getblock(inode, bh, x, fragment,	\
-			  &err, &phys, &new, bh_result->b_page);
+			  &err, &phys, &new, bh_result->b_page)
 #define GET_INDIRECT_PTR(x) \
 	ufs_inode_getblock(inode, bh, x, fragment,	\
-			  &err, NULL, NULL, bh_result->b_page);
+			  &err, NULL, NULL, NULL)
 
 	if (ptr < UFS_NDIR_FRAGMENT) {
 		bh = GET_INODE_DATABLOCK(ptr);