Re: [PATCH] fs: kill unused ret2 argument from iocb->ki_complete()
From: Jens Axboe <axboe@kernel.dk>
Date: 2021-10-20 18:56:09
Also in:
linux-fsdevel
Subsystem:
aio, block layer, cachefiles: fs-cache backend for caching on mounted filesystems, filesystems (vfs and infrastructure), nvm express target driver, overlay filesystem, scsi target subsystem, the rest, usb subsystem · Maintainers:
Benjamin LaHaise, Jens Axboe, David Howells, Alexander Viro, Christian Brauner, Christoph Hellwig, Sagi Grimberg, Chaitanya Kulkarni, Miklos Szeredi, Amir Goldstein, "Martin K. Petersen", Linus Torvalds, Greg Kroah-Hartman
Possibly related (same subject, not in this thread)
- 2021-10-23 · Re: [PATCH] fs: kill unused ret2 argument from iocb->ki_complete() · Jens Axboe <axboe@kernel.dk>
- 2021-10-23 · Re: [PATCH] fs: kill unused ret2 argument from iocb->ki_complete() · Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- 2021-10-22 · Re: [PATCH] fs: kill unused ret2 argument from iocb->ki_complete() · Jens Axboe <axboe@kernel.dk>
- 2021-10-21 · Re: [PATCH] fs: kill unused ret2 argument from iocb->ki_complete() · Jens Axboe <axboe@kernel.dk>
- 2021-10-21 · Re: [PATCH] fs: kill unused ret2 argument from iocb->ki_complete() · John Keeping <hidden>
On 10/20/21 12:41 PM, Jens Axboe wrote:
Working on just changing it to a 64-bit type instead, then we can pass in both at once with res2 being the upper 32 bits. That'll keep the same API on the aio side.
Here's that as an incremental. Since we can only be passing in 32-bits anyway across 32/64-bit, we can just make it an explicit 64-bit instead. This generates the same code on 64-bit for calling ->ki_complete, and we can trivially ignore the usb gadget issue as we now can pass in both values (and fill them in on the aio side).
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 92b87aa8be86..66c6e0c5d638 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c@@ -550,7 +550,7 @@ static void lo_rw_aio_do_completion(struct loop_cmd *cmd) blk_mq_complete_request(rq); } -static void lo_rw_aio_complete(struct kiocb *iocb, long ret) +static void lo_rw_aio_complete(struct kiocb *iocb, u64 ret) { struct loop_cmd *cmd = container_of(iocb, struct loop_cmd, iocb);
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 80a0f35ae1dc..83a2f5b0a3a0 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c@@ -123,7 +123,7 @@ static ssize_t nvmet_file_submit_bvec(struct nvmet_req *req, loff_t pos, return call_iter(iocb, &iter); } -static void nvmet_file_io_done(struct kiocb *iocb, long ret) +static void nvmet_file_io_done(struct kiocb *iocb, u64 ret) { struct nvmet_req *req = container_of(iocb, struct nvmet_req, f.iocb); u16 status = NVME_SC_SUCCESS;
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 968ace2ddf64..c4ca7fa18e61 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c@@ -245,7 +245,7 @@ struct target_core_file_cmd { struct bio_vec bvecs[]; }; -static void cmd_rw_aio_complete(struct kiocb *iocb, long ret) +static void cmd_rw_aio_complete(struct kiocb *iocb, u64 ret) { struct target_core_file_cmd *cmd;
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index e20c19a0f106..8536f19d3c9a 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c@@ -831,7 +831,7 @@ static void ffs_user_copy_worker(struct work_struct *work) kthread_unuse_mm(io_data->mm); } - io_data->kiocb->ki_complete(io_data->kiocb, ret); + io_data->kiocb->ki_complete(io_data->kiocb, ((u64) ret << 32) | ret); if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd) eventfd_signal(io_data->ffs->ffs_eventfd, 1);
diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index ad1739dbfab9..d3deb23eb2ab 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c@@ -469,7 +469,7 @@ static void ep_user_copy_worker(struct work_struct *work) ret = -EFAULT; /* completing the iocb can drop the ctx and mm, don't touch mm after */ - iocb->ki_complete(iocb, ret); + iocb->ki_complete(iocb, ((u64) ret << 32) | ret); kfree(priv->buf); kfree(priv->to_free);
@@ -492,14 +492,16 @@ static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req) * complete the aio request immediately. */ if (priv->to_free == NULL || unlikely(req->actual == 0)) { + u64 aio_ret; + kfree(req->buf); kfree(priv->to_free); kfree(priv); iocb->private = NULL; /* aio_complete() reports bytes-transferred _and_ faults */ - - iocb->ki_complete(iocb, - req->actual ? req->actual : (long)req->status); + aio_ret = req->actual ? req->actual : (long)req->status; + aio_ret |= (u64) req->status << 32; + iocb->ki_complete(iocb, aio_ret); } else { /* ep_copy_to_user() won't report both; we hide some faults */ if (unlikely(0 != req->status))
diff --git a/fs/aio.c b/fs/aio.c
index 836dc7e48db7..e39c61dccf37 100644
--- a/fs/aio.c
+++ b/fs/aio.c@@ -1417,7 +1417,7 @@ static void aio_remove_iocb(struct aio_kiocb *iocb) spin_unlock_irqrestore(&ctx->ctx_lock, flags); } -static void aio_complete_rw(struct kiocb *kiocb, long res) +static void aio_complete_rw(struct kiocb *kiocb, u64 res) { struct aio_kiocb *iocb = container_of(kiocb, struct aio_kiocb, rw);
@@ -1436,8 +1436,8 @@ static void aio_complete_rw(struct kiocb *kiocb, long res) file_end_write(kiocb->ki_filp); } - iocb->ki_res.res = res; - iocb->ki_res.res2 = 0; + iocb->ki_res.res = res & 0xffffffff; + iocb->ki_res.res2 = res >> 32; iocb_put(iocb); }
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index effe37ef8629..b2f44ff8eae2 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c@@ -37,11 +37,11 @@ static inline void cachefiles_put_kiocb(struct cachefiles_kiocb *ki) /* * Handle completion of a read from the cache. */ -static void cachefiles_read_complete(struct kiocb *iocb, long ret) +static void cachefiles_read_complete(struct kiocb *iocb, u64 ret) { struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb); - _enter("%ld", ret); + _enter("%llu", (unsigned long long) ret); if (ki->term_func) { if (ret >= 0)
@@ -159,12 +159,12 @@ static int cachefiles_read(struct netfs_cache_resources *cres, /* * Handle completion of a write to the cache. */ -static void cachefiles_write_complete(struct kiocb *iocb, long ret) +static void cachefiles_write_complete(struct kiocb *iocb, u64 ret) { struct cachefiles_kiocb *ki = container_of(iocb, struct cachefiles_kiocb, iocb); struct inode *inode = file_inode(ki->iocb.ki_filp); - _enter("%ld", ret); + _enter("%llu", (unsigned long long) ret); /* Tell lockdep we inherited freeze protection from submission thread */ __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 5ad046145f29..0ed6c199f394 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c@@ -2672,7 +2672,7 @@ static void __io_complete_rw(struct io_kiocb *req, long res, long res2, __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req)); } -static void io_complete_rw(struct kiocb *kiocb, long res) +static void io_complete_rw(struct kiocb *kiocb, u64 res) { struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
@@ -2683,7 +2683,7 @@ static void io_complete_rw(struct kiocb *kiocb, long res) io_req_task_work_add(req); } -static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) +static void io_complete_rw_iopoll(struct kiocb *kiocb, u64 res) { struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index ac461a499882..ff7db16aea2e 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c@@ -272,7 +272,7 @@ static void ovl_aio_cleanup_handler(struct ovl_aio_req *aio_req) kmem_cache_free(ovl_aio_request_cachep, aio_req); } -static void ovl_aio_rw_complete(struct kiocb *iocb, long res) +static void ovl_aio_rw_complete(struct kiocb *iocb, u64 res) { struct ovl_aio_req *aio_req = container_of(iocb, struct ovl_aio_req, iocb);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0dcb9020a7b3..3c809ce2518c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h@@ -330,7 +330,7 @@ struct kiocb { randomized_struct_fields_start loff_t ki_pos; - void (*ki_complete)(struct kiocb *iocb, long ret); + void (*ki_complete)(struct kiocb *iocb, u64 ret); void *private; int ki_flags; u16 ki_hint;
--
Jens Axboe