ext4: fix inline data updates with checksums enabled

The inline data code was updating the raw inode directly; this is
problematic since if metadata checksums are enabled,
ext4_mark_inode_dirty() must be called to update the inode's checksum.
In addition, the jbd2 layer requires that get_write_access() be called
before the metadata buffer is modified.  Fix both of these problems.

https://bugzilla.kernel.org/show_bug.cgi?id=200443

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

2 files changed, 18 insertions, 17 deletions

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index e55a8bc870bd..3543fe80a3c4 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -682,6 +682,10 @@ int ext4_try_to_write_inline_data(struct address_space *mapping,
                 goto convert;
         }
 
+        ret = ext4_journal_get_write_access(handle, iloc.bh);
+        if (ret)
+                goto out;
+
         flags |= AOP_FLAG_NOFS;
 
         page = grab_cache_page_write_begin(mapping, 0, flags);
@@ -710,7 +714,7 @@ int ext4_try_to_write_inline_data(struct address_space *mapping,
 out_up_read:
         up_read(&EXT4_I(inode)->xattr_sem);
 out:
-        if (handle)
+        if (handle && (ret != 1))
                 ext4_journal_stop(handle);
         brelse(iloc.bh);
         return ret;
@@ -752,6 +756,7 @@ int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 
         ext4_write_unlock_xattr(inode, &no_expand);
         brelse(iloc.bh);
+        mark_inode_dirty(inode);
 out:
         return copied;
 }
@@ -898,7 +903,6 @@ retry_journal:
                 goto out;
         }
 
-
         page = grab_cache_page_write_begin(mapping, 0, flags);
         if (!page) {
                 ret = -ENOMEM;
@@ -916,6 +920,9 @@ retry_journal:
                 if (ret < 0)
                         goto out_release_page;
         }
+        ret = ext4_journal_get_write_access(handle, iloc.bh);
+        if (ret)
+                goto out_release_page;
 
         up_read(&EXT4_I(inode)->xattr_sem);
         *pagep = page;
@@ -936,7 +943,6 @@ int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
                                   unsigned len, unsigned copied,
                                   struct page *page)
 {
-        int i_size_changed = 0;
         int ret;
 
         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
@@ -954,10 +960,8 @@ int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
          * But it's important to update i_size while still holding page lock:
          * page writeout could otherwise come in and zero beyond i_size.
          */
-        if (pos+copied > inode->i_size) {
+        if (pos+copied > inode->i_size)
                 i_size_write(inode, pos+copied);
-                i_size_changed = 1;
-        }
         unlock_page(page);
         put_page(page);
 
@@ -967,8 +971,7 @@ int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
          * ordering of page lock and transaction start for journaling
          * filesystems.
          */
-        if (i_size_changed)
-                mark_inode_dirty(inode);
+        mark_inode_dirty(inode);
 
         return copied;
 }
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7d6c10017bdf..4efe77286ecd 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1389,9 +1389,10 @@ static int ext4_write_end(struct file *file,
         loff_t old_size = inode->i_size;
         int ret = 0, ret2;
         int i_size_changed = 0;
+        int inline_data = ext4_has_inline_data(inode);
 
         trace_ext4_write_end(inode, pos, len, copied);
-        if (ext4_has_inline_data(inode)) {
+        if (inline_data) {
                 ret = ext4_write_inline_data_end(inode, pos, len,
                                                  copied, page);
                 if (ret < 0) {
@@ -1419,7 +1420,7 @@ static int ext4_write_end(struct file *file,
          * ordering of page lock and transaction start for journaling
          * filesystems.
          */
-        if (i_size_changed)
+        if (i_size_changed || inline_data)
                 ext4_mark_inode_dirty(handle, inode);
 
         if (pos + len > inode->i_size && ext4_can_truncate(inode))
@@ -1493,6 +1494,7 @@ static int ext4_journalled_write_end(struct file *file,
         int partial = 0;
         unsigned from, to;
         int size_changed = 0;
+        int inline_data = ext4_has_inline_data(inode);
 
         trace_ext4_journalled_write_end(inode, pos, len, copied);
         from = pos & (PAGE_SIZE - 1);
@@ -1500,7 +1502,7 @@ static int ext4_journalled_write_end(struct file *file,
 
         BUG_ON(!ext4_handle_valid(handle));
 
-        if (ext4_has_inline_data(inode)) {
+        if (inline_data) {
                 ret = ext4_write_inline_data_end(inode, pos, len,
                                                  copied, page);
                 if (ret < 0) {
@@ -1531,7 +1533,7 @@ static int ext4_journalled_write_end(struct file *file,
         if (old_size < pos)
                 pagecache_isize_extended(inode, old_size, pos);
 
-        if (size_changed) {
+        if (size_changed || inline_data) {
                 ret2 = ext4_mark_inode_dirty(handle, inode);
                 if (!ret)
                         ret = ret2;
@@ -2028,11 +2030,7 @@ static int __ext4_journalled_writepage(struct page *page,
         }
 
         if (inline_data) {
-                BUFFER_TRACE(inode_bh, "get write access");
-                ret = ext4_journal_get_write_access(handle, inode_bh);
-
-                err = ext4_handle_dirty_metadata(handle, inode, inode_bh);
-
+                ret = ext4_mark_inode_dirty(handle, inode);
         } else {
                 ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL,
                                              do_journal_get_write_access);