From a3c0d439e4d92411c2b4b21a526a4de720d0806b Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 27 Mar 2018 19:18:57 +0200 Subject: [PATCH] aio: implement IOCB_CMD_FSYNC and IOCB_CMD_FDSYNC Simple workqueue offload for now, but prepared for adding a real aio_fsync method if the need arises. Based on an earlier patch from Dave Chinner. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Darrick J. Wong --- fs/aio.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/fs/aio.c b/fs/aio.c index d07c27b3..61d2e69 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -156,6 +156,12 @@ struct kioctx { unsigned id; }; +struct fsync_iocb { + struct work_struct work; + struct file *file; + bool datasync; +}; + /* * We use ki_cancel == KIOCB_CANCELLED to indicate that a kiocb has been either * cancelled or completed (this makes a certain amount of sense because @@ -172,6 +178,7 @@ struct kioctx { struct aio_kiocb { union { struct kiocb rw; + struct fsync_iocb fsync; }; struct kioctx *ki_ctx; @@ -1573,6 +1580,36 @@ out_fput: return ret; } +static void aio_fsync_work(struct work_struct *work) +{ + struct fsync_iocb *req = container_of(work, struct fsync_iocb, work); + int ret; + + ret = vfs_fsync(req->file, req->datasync); + fput(req->file); + aio_complete(container_of(req, struct aio_kiocb, fsync), ret, 0); +} + +static int aio_fsync(struct fsync_iocb *req, struct iocb *iocb, bool datasync) +{ + if (unlikely(iocb->aio_buf || iocb->aio_offset || iocb->aio_nbytes || + iocb->aio_rw_flags)) + return -EINVAL; + + req->file = fget(iocb->aio_fildes); + if (unlikely(!req->file)) + return -EBADF; + if (unlikely(!req->file->f_op->fsync)) { + fput(req->file); + return -EINVAL; + } + + req->datasync = datasync; + INIT_WORK(&req->work, aio_fsync_work); + schedule_work(&req->work); + return -EIOCBQUEUED; +} + static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, struct iocb *iocb, bool compat) { @@ -1636,6 +1673,12 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, case IOCB_CMD_PWRITEV: ret = aio_write(&req->rw, iocb, true, compat); break; + case IOCB_CMD_FSYNC: + ret = aio_fsync(&req->fsync, iocb, false); + break; + case IOCB_CMD_FDSYNC: + ret = aio_fsync(&req->fsync, iocb, true); + break; default: pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode); ret = -EINVAL; -- 2.7.4