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ext4: fix inline data updates with checksums enabled

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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
This commit is contained in:
Theodore Ts'o
2018-07-10 01:07:43 -04:00
parent 2dca60d98e
commit 362eca70b5
2 changed files with 18 additions and 17 deletions
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19
fs/ext4/inline.c
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@@ -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;
}