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

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 conversion 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@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 35 insertions, 18 deletions

diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index b8fa34a..841ac25 100644
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -482,8 +482,9 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
 	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);
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 366618d..013d7af 100644
--- a/fs/ufs/inode.c
+++ b/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;
 	}
 
diff --git a/fs/ufs/truncate.c b/fs/ufs/truncate.c
index 749581f..52fb2b59 100644
--- a/fs/ufs/truncate.c
+++ b/fs/ufs/truncate.c
@@ -74,7 +74,7 @@ static int ufs_trunc_direct(struct inode *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 *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 inode *inode, u64 offset, void *p)
 	}
 	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 inode *inode, u64 offset, void *p)
 	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 inode *inode, u64 offset, void *p)
 	}
 	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 inode *inode)
 	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 inode *inode)
 	}
 	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 inode *inode)
 	       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: