[PATCH 3/4]: ufs: zeroize the rest of block in truncate

[Evgeniy Dushistov]

This patch fix behaviour in such test scenario:

lseek(fd, BIG_OFFSET)
write(fd, buf, sizeof(buf))
truncate(BIG_OFFSET)
truncate(BIG_OFFSET + sizeof(buf))
read(fd, buf...)

Because of if file big enough(BIG_OFFSET) we start allocate
space by block, ordinary block size > page size,
so we should zeroize the rest of block in truncate(except last framgnet,
about which VFS should care), to not get garbage,
when we extend file.

Also patch corrects conversation
from pointer to block to physical block number,
this helps in case of not common used UFS types.

And add to debug output inode number.

Signed-off-by: Evgeniy Dushistov <dushistov@xxxxxxx>

---

Index: linux-2.6.21-rc3-git6/fs/ufs/truncate.c
===================================================================
--- linux-2.6.21-rc3-git6.orig/fs/ufs/truncate.c
+++ linux-2.6.21-rc3-git6/fs/ufs/truncate.c
@@ -74,7 +74,7 @@ static int ufs_trunc_direct(struct inode
 	unsigned i, tmp;
 	int retry;
 	
-	UFSD("ENTER\n");
+	UFSD("ENTER: ino %lu\n", inode->i_ino);
 
 	sb = inode->i_sb;
 	uspi = UFS_SB(sb)->s_uspi;
@@ -96,8 +96,8 @@ static int ufs_trunc_direct(struct inode
 		block2 = ufs_fragstoblks (frag3);
 	}
 
-	UFSD("frag1 %llu, frag2 %llu, block1 %llu, block2 %llu, frag3 %llu,"
-	     " frag4 %llu\n",
+	UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
+	     " frag3 %llu, frag4 %llu\n", inode->i_ino,
 	     (unsigned long long)frag1, (unsigned long long)frag2,
 	     (unsigned long long)block1, (unsigned long long)block2,
 	     (unsigned long long)frag3, (unsigned long long)frag4);
@@ -163,7 +163,7 @@ next1:
 	mark_inode_dirty(inode);
  next3:
 
-	UFSD("EXIT\n");
+	UFSD("EXIT: ino %lu\n", inode->i_ino);
 	return retry;
 }
 
@@ -248,7 +248,7 @@ static int ufs_trunc_indirect(struct ino
 	}
 	ubh_brelse (ind_ubh);
 	
-	UFSD("EXIT\n");
+	UFSD("EXIT: ino %lu\n", inode->i_ino);
 	
 	return retry;
 }
@@ -262,7 +262,7 @@ static int ufs_trunc_dindirect(struct in
 	void *dind;
 	int retry = 0;
 	
-	UFSD("ENTER\n");
+	UFSD("ENTER: ino %lu\n", inode->i_ino);
 	
 	sb = inode->i_sb;
 	uspi = UFS_SB(sb)->s_uspi;
@@ -312,7 +312,7 @@ static int ufs_trunc_dindirect(struct in
 	}
 	ubh_brelse (dind_bh);
 	
-	UFSD("EXIT\n");
+	UFSD("EXIT: ino %lu\n", inode->i_ino);
 	
 	return retry;
 }
@@ -327,7 +327,7 @@ static int ufs_trunc_tindirect(struct in
 	void *tind, *p;
 	int retry;
 	
-	UFSD("ENTER\n");
+	UFSD("ENTER: ino %lu\n", inode->i_ino);
 
 	retry = 0;
 	
@@ -372,19 +372,21 @@ static int ufs_trunc_tindirect(struct in
 	}
 	ubh_brelse (tind_bh);
 	
-	UFSD("EXIT\n");
+	UFSD("EXIT: ino %lu\n", inode->i_ino);
 	return retry;
 }
 
 static int ufs_alloc_lastblock(struct inode *inode)
 {
 	int err = 0;
+	struct super_block *sb = inode->i_sb;
 	struct address_space *mapping = inode->i_mapping;
-	struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
+	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 	unsigned i, end;
 	sector_t lastfrag;
 	struct page *lastpage;
 	struct buffer_head *bh;
+	u64 phys64;
 
 	lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
 
@@ -424,6 +426,20 @@ static int ufs_alloc_lastblock(struct in
 	       set_page_dirty(lastpage);
        }
 
+       if (lastfrag >= UFS_IND_FRAGMENT) {
+	       end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
+	       phys64 = bh->b_blocknr + 1;
+	       for (i = 0; i < end; ++i) {
+		       bh = sb_getblk(sb, i + phys64);
+		       lock_buffer(bh);
+		       memset(bh->b_data, 0, sb->s_blocksize);
+		       set_buffer_uptodate(bh);
+		       mark_buffer_dirty(bh);
+		       unlock_buffer(bh);
+		       sync_dirty_buffer(bh);
+		       brelse(bh);
+	       }
+       }
 out_unlock:
        ufs_put_locked_page(lastpage);
 out:
Index: linux-2.6.21-rc3-git6/fs/ufs/inode.c
===================================================================
--- linux-2.6.21-rc3-git6.orig/fs/ufs/inode.c
+++ linux-2.6.21-rc3-git6/fs/ufs/inode.c
@@ -212,7 +212,7 @@ repeat:
 			brelse (result);
 			goto repeat;
 		} else {
-			*phys = tmp + blockoff;
+			*phys = uspi->s_sbbase + tmp + blockoff;
 			return NULL;
 		}
 	}
@@ -282,9 +282,9 @@ repeat:
 	}
 
 	if (!phys) {
-		result = sb_getblk(sb, tmp + blockoff);
+		result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 	} else {
-		*phys = tmp + blockoff;
+		*phys = uspi->s_sbbase + tmp + blockoff;
 		result = NULL;
 		*err = 0;
 		*new = 1;
@@ -368,7 +368,7 @@ repeat:
 			brelse (result);
 			goto repeat;
 		} else {
-			*phys = tmp + blockoff;
+			*phys = uspi->s_sbbase + tmp + blockoff;
 			goto out;
 		}
 	}
@@ -389,9 +389,9 @@ repeat:
 
 
 	if (!phys) {
-		result = sb_getblk(sb, tmp + blockoff);
+		result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
 	} else {
-		*phys = tmp + blockoff;
+		*phys = uspi->s_sbbase + tmp + blockoff;
 		*new = 1;
 	}
 
Index: linux-2.6.21-rc3-git6/fs/ufs/balloc.c
===================================================================
--- linux-2.6.21-rc3-git6.orig/fs/ufs/balloc.c
+++ linux-2.6.21-rc3-git6/fs/ufs/balloc.c
@@ -482,8 +482,9 @@ u64 ufs_new_fragments(struct inode *inod
 	if (result) {
 		ufs_clear_frags(inode, result + oldcount, newcount - oldcount,
 				locked_page != NULL);
-		ufs_change_blocknr(inode, fragment - oldcount, oldcount, tmp,
-				   result, locked_page);
+		ufs_change_blocknr(inode, fragment - oldcount, oldcount,
+				   uspi->s_sbbase + tmp,
+				   uspi->s_sbbase + result, locked_page);
 		ufs_cpu_to_data_ptr(sb, p, result);
 		*err = 0;
 		UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
-- 
/Evgeniy

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