linux-ext4 - [PATCH 3/7] ext2fs: Update allocation info earlier in ext2fs_mkdir() and ext2fs

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Date:   Thu, 13 Feb 2020 11:15:58 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH 3/7] ext2fs: Update allocation info earlier in ext2fs_mkdir() and ext2fs_symlink()

Currently, ext2fs_mkdir() and ext2fs_symlink() update allocation bitmaps
and other information only close to the end of the function, in
particular after calling to ext2fs_link(). When ext2fs_link() will
support indexed directories, it will also need to allocate blocks and
that would cause filesystem corruption in case allocation info isn't
properly updated. So make sure ext2fs_mkdir() and ext2fs_symlink()
update allocation info before calling into ext2fs_link().

Signed-off-by: Jan Kara <jack@...e.cz>
---
 lib/ext2fs/mkdir.c   | 14 +++++++-------
 lib/ext2fs/symlink.c | 14 +++++++-------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/lib/ext2fs/mkdir.c b/lib/ext2fs/mkdir.c
index 2a63aad16715..947003ebf309 100644
--- a/lib/ext2fs/mkdir.c
+++ b/lib/ext2fs/mkdir.c
@@ -143,6 +143,13 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
 		}
 	}
 
+	/*
+	 * Update accounting....
+	 */
+	if (!inline_data)
+		ext2fs_block_alloc_stats2(fs, blk, +1);
+	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
+
 	/*
 	 * Link the directory into the filesystem hierarchy
 	 */
@@ -175,13 +182,6 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
 			goto cleanup;
 	}
 
-	/*
-	 * Update accounting....
-	 */
-	if (!inline_data)
-		ext2fs_block_alloc_stats2(fs, blk, +1);
-	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
-
 cleanup:
 	if (block)
 		ext2fs_free_mem(&block);
diff --git a/lib/ext2fs/symlink.c b/lib/ext2fs/symlink.c
index 7f78c5f75549..3e07a539daf3 100644
--- a/lib/ext2fs/symlink.c
+++ b/lib/ext2fs/symlink.c
@@ -162,6 +162,13 @@ need_block:
 			goto cleanup;
 	}
 
+	/*
+	 * Update accounting....
+	 */
+	if (!fastlink && !inlinelink)
+		ext2fs_block_alloc_stats2(fs, blk, +1);
+	ext2fs_inode_alloc_stats2(fs, ino, +1, 0);
+
 	/*
 	 * Link the symlink into the filesystem hierarchy
 	 */
@@ -179,13 +186,6 @@ need_block:
 			goto cleanup;
 	}
 
-	/*
-	 * Update accounting....
-	 */
-	if (!fastlink && !inlinelink)
-		ext2fs_block_alloc_stats2(fs, blk, +1);
-	ext2fs_inode_alloc_stats2(fs, ino, +1, 0);
-
 cleanup:
 	if (block_buf)
 		ext2fs_free_mem(&block_buf);
-- 
2.16.4