From: Kent Overstreet <koverstr...@google.com> This code doesn't serve any purpose anymore, since the aio retry infrastructure has been removed.
This change should be safe because aio_read/write are also used for synchronous IO, and called from do_sync_read()/do_sync_write() - and there's no looping done in the sync case (the read and write syscalls). Signed-off-by: Kent Overstreet <koverstr...@google.com> Cc: Zach Brown <z...@redhat.com> Cc: Felipe Balbi <ba...@ti.com> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Cc: Mark Fasheh <mfas...@suse.com> Cc: Joel Becker <jl...@evilplan.org> Cc: Rusty Russell <ru...@rustcorp.com.au> Cc: Jens Axboe <ax...@kernel.dk> Cc: Asai Thambi S P <asamymuth...@micron.com> Cc: Selvan Mani <sm...@micron.com> Cc: Sam Bradshaw <sbrads...@micron.com> Cc: Jeff Moyer <jmo...@redhat.com> Cc: Al Viro <v...@zeniv.linux.org.uk> Cc: Benjamin LaHaise <b...@kvack.org> Signed-off-by: Benjamin LaHaise <b...@kvack.org> https://jira.sw.ru/browse/PSBM-121197 (cherry picked from commit 73a7075e3f6ec63dc359064eea6fd84f406cf2a5) Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com> --- drivers/staging/android/logger.c | 2 +- drivers/usb/gadget/inode.c | 6 +-- fs/aio.c | 92 +++++++------------------------- fs/block_dev.c | 2 +- fs/nfs/direct.c | 1 - fs/ocfs2/file.c | 6 +-- fs/read_write.c | 3 -- fs/udf/file.c | 2 +- include/linux/aio.h | 2 - mm/page_io.c | 1 - net/socket.c | 2 +- 11 files changed, 28 insertions(+), 91 deletions(-) diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c index 34519ea14b54..16a6c3179625 100644 --- a/drivers/staging/android/logger.c +++ b/drivers/staging/android/logger.c @@ -481,7 +481,7 @@ static ssize_t logger_aio_write(struct kiocb *iocb, const struct iovec *iov, header.sec = now.tv_sec; header.nsec = now.tv_nsec; header.euid = current_euid(); - header.len = min_t(size_t, iocb->ki_left, LOGGER_ENTRY_MAX_PAYLOAD); + header.len = min_t(size_t, iocb->ki_nbytes, LOGGER_ENTRY_MAX_PAYLOAD); header.hdr_size = sizeof(struct logger_entry); /* null writes succeed, return zero */ diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c index 570c005062ab..09aae3c48d2c 100644 --- a/drivers/usb/gadget/inode.c +++ b/drivers/usb/gadget/inode.c @@ -709,11 +709,11 @@ ep_aio_read(struct kiocb *iocb, const struct iovec *iov, if (unlikely(usb_endpoint_dir_in(&epdata->desc))) return -EINVAL; - buf = kmalloc(iocb->ki_left, GFP_KERNEL); + buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL); if (unlikely(!buf)) return -ENOMEM; - return ep_aio_rwtail(iocb, buf, iocb->ki_left, epdata, iov, nr_segs); + return ep_aio_rwtail(iocb, buf, iocb->ki_nbytes, epdata, iov, nr_segs); } static ssize_t @@ -728,7 +728,7 @@ ep_aio_write(struct kiocb *iocb, const struct iovec *iov, if (unlikely(!usb_endpoint_dir_in(&epdata->desc))) return -EINVAL; - buf = kmalloc(iocb->ki_left, GFP_KERNEL); + buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL); if (unlikely(!buf)) return -ENOMEM; diff --git a/fs/aio.c b/fs/aio.c index c7e23a5832aa..f1b27fc5defb 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -879,7 +879,7 @@ static inline struct kiocb *aio_get_req(struct kioctx *ctx) if (unlikely(!req)) goto out_put; - atomic_set(&req->ki_users, 2); + atomic_set(&req->ki_users, 1); req->ki_ctx = ctx; return req; @@ -1279,75 +1279,9 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx) return -EINVAL; } -static void aio_advance_iovec(struct kiocb *iocb, ssize_t ret) -{ - struct iovec *iov = &iocb->ki_iovec[iocb->ki_cur_seg]; - - BUG_ON(ret <= 0); - - while (iocb->ki_cur_seg < iocb->ki_nr_segs && ret > 0) { - ssize_t this = min((ssize_t)iov->iov_len, ret); - iov->iov_base += this; - iov->iov_len -= this; - iocb->ki_left -= this; - ret -= this; - if (iov->iov_len == 0) { - iocb->ki_cur_seg++; - iov++; - } - } - - /* the caller should not have done more io than what fit in - * the remaining iovecs */ - BUG_ON(ret > 0 && iocb->ki_left == 0); -} - typedef ssize_t (aio_rw_op)(struct kiocb *, const struct iovec *, unsigned long, loff_t); -static ssize_t aio_rw_vect_retry(struct kiocb *iocb, int rw, aio_rw_op *rw_op) -{ - struct file *file = iocb->ki_filp; - struct address_space *mapping = file->f_mapping; - struct inode *inode = mapping->host; - ssize_t ret = 0; - - /* This matches the pread()/pwrite() logic */ - if (iocb->ki_pos < 0) - return -EINVAL; - - if (rw == WRITE) - file_start_write(file); - do { - ret = rw_op(iocb, &iocb->ki_iovec[iocb->ki_cur_seg], - iocb->ki_nr_segs - iocb->ki_cur_seg, - iocb->ki_pos); - if (ret > 0) - aio_advance_iovec(iocb, ret); - - /* retry all partial writes. retry partial reads as long as its a - * regular file. */ - } while (ret > 0 && iocb->ki_left > 0 && - (rw == WRITE || - (!S_ISFIFO(inode->i_mode) && !S_ISSOCK(inode->i_mode)))); - if (rw == WRITE) - file_end_write(file); - - /* This means we must have transferred all that we could */ - /* No need to retry anymore */ - if ((ret == 0) || (iocb->ki_left == 0)) - ret = iocb->ki_nbytes - iocb->ki_left; - - /* If we managed to write some out we return that, rather than - * the eventual error. */ - if (rw == WRITE - && ret < 0 && ret != -EIOCBQUEUED - && iocb->ki_nbytes - iocb->ki_left) - ret = iocb->ki_nbytes - iocb->ki_left; - - return ret; -} - static ssize_t aio_setup_vectored_rw(int rw, struct kiocb *kiocb, bool compat) { ssize_t ret; @@ -1482,9 +1416,22 @@ rw_common: return ret; req->ki_nbytes = ret; - req->ki_left = ret; - ret = aio_rw_vect_retry(req, rw, rw_op); + /* XXX: move/kill - rw_verify_area()? */ + /* This matches the pread()/pwrite() logic */ + if (req->ki_pos < 0) { + ret = -EINVAL; + break; + } + + if (rw == WRITE) + file_start_write(file); + + ret = rw_op(req, req->ki_iovec, + req->ki_nr_segs, req->ki_pos); + + if (rw == WRITE) + file_end_write(file); break; case IOCB_CMD_READ_ITER: @@ -1574,7 +1521,6 @@ void aio_kernel_init_iter(struct kiocb *iocb, struct file *filp, iocb->ki_opcode = op; iocb->ki_pos = off; iocb->ki_nbytes = iov_iter_count(iter); - iocb->ki_left = iocb->ki_nbytes; } EXPORT_SYMBOL_GPL(aio_kernel_init_iter); @@ -1673,19 +1619,17 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, req->ki_pos = iocb->aio_offset; req->ki_buf = (char __user *)(unsigned long)iocb->aio_buf; - req->ki_left = req->ki_nbytes = iocb->aio_nbytes; + req->ki_nbytes = iocb->aio_nbytes; req->ki_opcode = iocb->aio_lio_opcode; ret = aio_run_iocb(req, compat); if (ret) goto out_put_req; - aio_put_req(req); /* drop extra ref to req */ return 0; out_put_req: atomic_dec(&ctx->reqs_active); - aio_put_req(req); /* drop extra ref to req */ - aio_put_req(req); /* drop i/o ref to req */ + aio_put_req(req); return ret; } diff --git a/fs/block_dev.c b/fs/block_dev.c index 938ec89d197c..85e2a0e19f29 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1674,7 +1674,7 @@ ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov, return 0; size -= pos; - if (size < iocb->ki_left) + if (size < iocb->ki_nbytes) nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size); return generic_file_aio_read(iocb, iov, nr_segs, pos); } diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 376a89255029..e90c304f1f5d 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -269,7 +269,6 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t if (!IS_SWAPFILE(inode)) return 0; - VM_BUG_ON(iocb->ki_left != PAGE_SIZE); VM_BUG_ON(iocb->ki_nbytes != PAGE_SIZE); if (rw == READ || rw == KERNEL_READ) diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index dfa86a02e160..d72173f09ae6 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2246,7 +2246,7 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, file->f_path.dentry->d_name.name, (unsigned int)nr_segs); - if (iocb->ki_left == 0) + if (iocb->ki_nbytes == 0) return 0; appending = file->f_flags & O_APPEND ? 1 : 0; @@ -2297,7 +2297,7 @@ relock: can_do_direct = direct_io; ret = ocfs2_prepare_inode_for_write(file, ppos, - iocb->ki_left, appending, + iocb->ki_nbytes, appending, &can_do_direct, &has_refcount); if (ret < 0) { mlog_errno(ret); @@ -2305,7 +2305,7 @@ relock: } if (direct_io && !is_sync_kiocb(iocb)) - unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_left, + unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_nbytes, *ppos); /* diff --git a/fs/read_write.c b/fs/read_write.c index 2ee36621241b..fbcb6e41598e 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -437,7 +437,6 @@ ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *pp init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; - kiocb.ki_left = len; kiocb.ki_nbytes = len; ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); @@ -487,7 +486,6 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; - kiocb.ki_left = len; kiocb.ki_nbytes = len; ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); @@ -669,7 +667,6 @@ static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; - kiocb.ki_left = len; kiocb.ki_nbytes = len; ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos); diff --git a/fs/udf/file.c b/fs/udf/file.c index 85bc0000dc91..6df5ef334f9b 100644 --- a/fs/udf/file.c +++ b/fs/udf/file.c @@ -141,7 +141,7 @@ static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov, struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); int err, pos; - size_t count = iocb->ki_left; + size_t count = iocb->ki_nbytes; struct udf_inode_info *iinfo = UDF_I(inode); down_write(&iinfo->i_data_sem); diff --git a/include/linux/aio.h b/include/linux/aio.h index 238cb705b19d..45ce7483347f 100644 --- a/include/linux/aio.h +++ b/include/linux/aio.h @@ -61,11 +61,9 @@ struct kiocb { unsigned short ki_opcode; size_t ki_nbytes; /* copy of iocb->aio_nbytes */ char __user *ki_buf; /* remaining iocb->aio_buf */ - size_t ki_left; /* remaining bytes */ struct iovec ki_inline_vec; /* inline vector */ struct iovec *ki_iovec; unsigned long ki_nr_segs; - unsigned long ki_cur_seg; struct list_head ki_list; /* the aio core uses this * for cancellation */ diff --git a/mm/page_io.c b/mm/page_io.c index 8611924c59c0..765f4b7c09d6 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -229,7 +229,6 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc, init_sync_kiocb(&kiocb, swap_file); kiocb.ki_pos = page_file_offset(page); - kiocb.ki_left = PAGE_SIZE; kiocb.ki_nbytes = PAGE_SIZE; iov_iter_init(&iter, &iov, 1, PAGE_SIZE, 0); diff --git a/net/socket.c b/net/socket.c index a60a04faa6a7..22acff9d617c 100644 --- a/net/socket.c +++ b/net/socket.c @@ -972,7 +972,7 @@ static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, if (pos != 0) return -ESPIPE; - if (iocb->ki_left == 0) /* Match SYS5 behaviour */ + if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */ return 0; -- 2.26.2 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
