From: Jan Kara <jack@xxxxxxx> When DAX is enabled, it uses i_mmap_mutex as a protection against truncate during page fault. This inevitably forces i_mmap_mutex to rank outside of a transaction start and thus we have to avoid calling pagecache purging operations when transaction is started. Signed-off-by: Jan Kara <jack@xxxxxxx> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx> --- fs/ext4/inode.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 8a06473..494a864 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3631,13 +3631,19 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) if (IS_SYNC(inode)) ext4_handle_sync(handle); - /* Now release the pages again to reduce race window */ + inode->i_mtime = inode->i_ctime = ext4_current_time(inode); + ext4_mark_inode_dirty(handle, inode); + ext4_journal_stop(handle); + + /* + * Now release the pages again to reduce race window. This has to happen + * outside of a transaction to avoid lock inversion on i_mmap_mutex + * when DAX is enabled. + */ if (last_block_offset > first_block_offset) truncate_pagecache_range(inode, first_block_offset, last_block_offset); - - inode->i_mtime = inode->i_ctime = ext4_current_time(inode); - ext4_mark_inode_dirty(handle, inode); + goto out_dio; out_stop: ext4_journal_stop(handle); out_dio: -- 2.0.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>