ext4: Avoid data / filesystem corruption when write fails to copy data

When ext4_write_begin fails after allocating some blocks or
generic_perform_write fails to copy data to write, we truncate blocks
already instantiated beyond i_size.  Although these blocks were never
inside i_size, we have to truncate the pagecache of these blocks so
that corresponding buffers get unmapped.  Otherwise subsequent
__block_prepare_write (called because we are retrying the write) will
find the buffers mapped, not call ->get_block, and thus the page will
be backed by already freed blocks leading to filesystem and data
corruption.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 15 insertions, 5 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d3f99e9e8a31..0e2ea572856c 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1492,6 +1492,16 @@ static int do_journal_get_write_access(handle_t *handle,
         return ext4_journal_get_write_access(handle, bh);
 }
 
+/*
+ * Truncate blocks that were not used by write. We have to truncate the
+ * pagecache as well so that corresponding buffers get properly unmapped.
+ */
+static void ext4_truncate_failed_write(struct inode *inode)
+{
+        truncate_inode_pages(inode->i_mapping, inode->i_size);
+        ext4_truncate(inode);
+}
+
 static int ext4_write_begin(struct file *file, struct address_space *mapping,
                             loff_t pos, unsigned len, unsigned flags,
                             struct page **pagep, void **fsdata)
@@ -1557,7 +1567,7 @@ retry:
 
                 ext4_journal_stop(handle);
                 if (pos + len > inode->i_size) {
-                        ext4_truncate(inode);
+                        ext4_truncate_failed_write(inode);
                         /*
                          * If truncate failed early the inode might
                          * still be on the orphan list; we need to
@@ -1667,7 +1677,7 @@ static int ext4_ordered_write_end(struct file *file,
                 ret = ret2;
 
         if (pos + len > inode->i_size) {
-                ext4_truncate(inode);
+                ext4_truncate_failed_write(inode);
                 /*
                  * If truncate failed early the inode might still be
                  * on the orphan list; we need to make sure the inode
@@ -1709,7 +1719,7 @@ static int ext4_writeback_write_end(struct file *file,
                 ret = ret2;
 
         if (pos + len > inode->i_size) {
-                ext4_truncate(inode);
+                ext4_truncate_failed_write(inode);
                 /*
                  * If truncate failed early the inode might still be
                  * on the orphan list; we need to make sure the inode
@@ -1772,7 +1782,7 @@ static int ext4_journalled_write_end(struct file *file,
         if (!ret)
                 ret = ret2;
         if (pos + len > inode->i_size) {
-                ext4_truncate(inode);
+                ext4_truncate_failed_write(inode);
                 /*
                  * If truncate failed early the inode might still be
                  * on the orphan list; we need to make sure the inode
@@ -3048,7 +3058,7 @@ retry:
                  * i_size_read because we hold i_mutex.
                  */
                 if (pos + len > inode->i_size)
-                        ext4_truncate(inode);
+                        ext4_truncate_failed_write(inode);
         }
 
         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))