From: Omar Sandoval <osandov@xxxxxx> Hi, everyone, Btrfs currently abuses current->journal_info in btrfs_direct_IO() in order to pass around some state to get_block() and submit_io(). This hack is ugly and unnecessary because the data we pass around is only used in one call frame. Robbie Ko also pointed out [1] that it could potentially cause a crash if we happen to end up in start_transaction() (e.g., from memory reclaim calling into btrfs_evict_inode(), which can start a transaction). I'm not convinced that Robbie's case can happen in practice since we are using GFP_NOFS for allocations during direct I/O, but either way it's fragile and nasty. This series stops using current->journal_info and instead adds some extra arguments to the generic direct I/O code so that we can pass things around like sane people. Based on Linus' master. Thanks! 1: https://patchwork.kernel.org/patch/10389077/ Omar Sandoval (3): fs: add initial bh_result->b_private value to __blockdev_direct_IO() fs: add private argument to dio_submit_t Btrfs: stop abusing current->journal_info in btrfs_direct_IO() fs/btrfs/inode.c | 39 ++++++++++----------------------------- fs/direct-io.c | 12 +++++++----- fs/ext4/inode.c | 6 +++--- fs/gfs2/aops.c | 2 +- fs/ocfs2/aops.c | 5 ++--- include/linux/fs.h | 10 +++++----- 6 files changed, 28 insertions(+), 46 deletions(-) -- 2.17.0
