From: Zhang Yi <yi.zhang@xxxxxxxxxx> [ Upstream commit 55ce2f649b9e88111270333a8127e23f4f8f42d7 ] Current error path of ext4_write_inline_data_end() is not correct. Firstly, it should pass out the error value if ext4_get_inode_loc() return fail, or else it could trigger infinite loop if we inject error here. And then it's better to add inode to orphan list if it return fail in ext4_journal_stop(), otherwise we could not restore inline xattr entry after power failure. Finally, we need to reset the 'ret' value if ext4_write_inline_data_end() return success in ext4_write_end() and ext4_journalled_write_end(), otherwise we could not get the error return value of ext4_journal_stop(). Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx> Reviewed-by: Jan Kara <jack@xxxxxxx> Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Link: https://lore.kernel.org/r/20210716122024.1105856-3-yi.zhang@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- fs/ext4/inline.c | 15 +++++---------- fs/ext4/inode.c | 7 +++++-- 2 files changed, 10 insertions(+), 12 deletions(-) diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index 24e994e75f5c..8049448476a6 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -733,18 +733,13 @@ int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, void *kaddr; struct ext4_iloc iloc; - if (unlikely(copied < len)) { - if (!PageUptodate(page)) { - copied = 0; - goto out; - } - } + if (unlikely(copied < len) && !PageUptodate(page)) + return 0; ret = ext4_get_inode_loc(inode, &iloc); if (ret) { ext4_std_error(inode->i_sb, ret); - copied = 0; - goto out; + return ret; } ext4_write_lock_xattr(inode, &no_expand); @@ -757,7 +752,7 @@ int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, (void) ext4_find_inline_data_nolock(inode); kaddr = kmap_atomic(page); - ext4_write_inline_data(inode, &iloc, kaddr, pos, len); + ext4_write_inline_data(inode, &iloc, kaddr, pos, copied); kunmap_atomic(kaddr); SetPageUptodate(page); /* clear page dirty so that writepages wouldn't work for us. */ @@ -766,7 +761,7 @@ 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; } diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index a47ff8ce289b..fc6ea56de77c 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1295,6 +1295,7 @@ static int ext4_write_end(struct file *file, goto errout; } copied = ret; + ret = 0; } else copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); @@ -1321,13 +1322,14 @@ static int ext4_write_end(struct file *file, if (i_size_changed || inline_data) ret = ext4_mark_inode_dirty(handle, inode); +errout: if (pos + len > inode->i_size && !verity && ext4_can_truncate(inode)) /* if we have allocated more blocks and copied * less. We will have blocks allocated outside * inode->i_size. So truncate them */ ext4_orphan_add(handle, inode); -errout: + ret2 = ext4_journal_stop(handle); if (!ret) ret = ret2; @@ -1410,6 +1412,7 @@ static int ext4_journalled_write_end(struct file *file, goto errout; } copied = ret; + ret = 0; } else if (unlikely(copied < len) && !PageUptodate(page)) { copied = 0; ext4_journalled_zero_new_buffers(handle, page, from, to); @@ -1439,6 +1442,7 @@ static int ext4_journalled_write_end(struct file *file, ret = ret2; } +errout: if (pos + len > inode->i_size && !verity && ext4_can_truncate(inode)) /* if we have allocated more blocks and copied * less. We will have blocks allocated outside @@ -1446,7 +1450,6 @@ static int ext4_journalled_write_end(struct file *file, */ ext4_orphan_add(handle, inode); -errout: ret2 = ext4_journal_stop(handle); if (!ret) ret = ret2; -- 2.33.0
