forked from Minki/linux
aio: refactor read/write iocb setup
Don't reference the kiocb structure from the common aio code, and move any use of it into helper specific to the read/write path. This is in preparation for aio_poll support that wants to use the space for different fields. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jeff Moyer <jmoyer@redhat.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig
parent
92ce472856
commit
54843f875f
161
fs/aio.c
161
fs/aio.c
@ -170,7 +170,9 @@ struct kioctx {
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#define KIOCB_CANCELLED ((void *) (~0ULL))
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struct aio_kiocb {
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struct kiocb common;
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union {
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struct kiocb rw;
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};
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struct kioctx *ki_ctx;
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kiocb_cancel_fn *ki_cancel;
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@ -549,7 +551,7 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events)
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void kiocb_set_cancel_fn(struct kiocb *iocb, kiocb_cancel_fn *cancel)
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{
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struct aio_kiocb *req = container_of(iocb, struct aio_kiocb, common);
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struct aio_kiocb *req = container_of(iocb, struct aio_kiocb, rw);
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struct kioctx *ctx = req->ki_ctx;
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unsigned long flags;
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@ -581,7 +583,7 @@ static int kiocb_cancel(struct aio_kiocb *kiocb)
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cancel = cmpxchg(&kiocb->ki_cancel, old, KIOCB_CANCELLED);
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} while (cancel != old);
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return cancel(&kiocb->common);
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return cancel(&kiocb->rw);
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}
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/*
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@ -1046,15 +1048,6 @@ out_put:
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return NULL;
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}
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static void kiocb_free(struct aio_kiocb *req)
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{
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if (req->common.ki_filp)
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fput(req->common.ki_filp);
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if (req->ki_eventfd != NULL)
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eventfd_ctx_put(req->ki_eventfd);
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kmem_cache_free(kiocb_cachep, req);
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}
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static struct kioctx *lookup_ioctx(unsigned long ctx_id)
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{
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struct aio_ring __user *ring = (void __user *)ctx_id;
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@ -1085,27 +1078,14 @@ out:
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/* aio_complete
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* Called when the io request on the given iocb is complete.
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*/
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static void aio_complete(struct kiocb *kiocb, long res, long res2)
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static void aio_complete(struct aio_kiocb *iocb, long res, long res2)
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{
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struct aio_kiocb *iocb = container_of(kiocb, struct aio_kiocb, common);
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struct kioctx *ctx = iocb->ki_ctx;
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struct aio_ring *ring;
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struct io_event *ev_page, *event;
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unsigned tail, pos, head;
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unsigned long flags;
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if (kiocb->ki_flags & IOCB_WRITE) {
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struct file *file = kiocb->ki_filp;
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/*
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* Tell lockdep we inherited freeze protection from submission
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* thread.
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*/
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if (S_ISREG(file_inode(file)->i_mode))
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__sb_writers_acquired(file_inode(file)->i_sb, SB_FREEZE_WRITE);
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file_end_write(file);
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}
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if (!list_empty_careful(&iocb->ki_list)) {
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unsigned long flags;
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@ -1167,11 +1147,12 @@ static void aio_complete(struct kiocb *kiocb, long res, long res2)
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* eventfd. The eventfd_signal() function is safe to be called
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* from IRQ context.
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*/
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if (iocb->ki_eventfd != NULL)
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if (iocb->ki_eventfd) {
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eventfd_signal(iocb->ki_eventfd, 1);
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eventfd_ctx_put(iocb->ki_eventfd);
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}
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/* everything turned out well, dispose of the aiocb. */
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kiocb_free(iocb);
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kmem_cache_free(kiocb_cachep, iocb);
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/*
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* We have to order our ring_info tail store above and test
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@ -1434,6 +1415,45 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
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return -EINVAL;
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}
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static void aio_complete_rw(struct kiocb *kiocb, long res, long res2)
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{
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struct aio_kiocb *iocb = container_of(kiocb, struct aio_kiocb, rw);
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if (kiocb->ki_flags & IOCB_WRITE) {
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struct inode *inode = file_inode(kiocb->ki_filp);
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/*
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* Tell lockdep we inherited freeze protection from submission
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* thread.
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*/
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if (S_ISREG(inode->i_mode))
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__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
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file_end_write(kiocb->ki_filp);
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}
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fput(kiocb->ki_filp);
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aio_complete(iocb, res, res2);
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}
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static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
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{
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int ret;
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req->ki_filp = fget(iocb->aio_fildes);
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if (unlikely(!req->ki_filp))
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return -EBADF;
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req->ki_complete = aio_complete_rw;
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req->ki_pos = iocb->aio_offset;
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req->ki_flags = iocb_flags(req->ki_filp);
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if (iocb->aio_flags & IOCB_FLAG_RESFD)
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req->ki_flags |= IOCB_EVENTFD;
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req->ki_hint = file_write_hint(req->ki_filp);
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ret = kiocb_set_rw_flags(req, iocb->aio_rw_flags);
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if (unlikely(ret))
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fput(req->ki_filp);
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return ret;
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}
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static int aio_setup_rw(int rw, struct iocb *iocb, struct iovec **iovec,
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bool vectored, bool compat, struct iov_iter *iter)
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{
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@ -1453,7 +1473,7 @@ static int aio_setup_rw(int rw, struct iocb *iocb, struct iovec **iovec,
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return import_iovec(rw, buf, len, UIO_FASTIOV, iovec, iter);
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}
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static inline ssize_t aio_ret(struct kiocb *req, ssize_t ret)
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static inline ssize_t aio_rw_ret(struct kiocb *req, ssize_t ret)
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{
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switch (ret) {
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case -EIOCBQUEUED:
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@ -1469,7 +1489,7 @@ static inline ssize_t aio_ret(struct kiocb *req, ssize_t ret)
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ret = -EINTR;
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/*FALLTHRU*/
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default:
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aio_complete(req, ret, 0);
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aio_complete_rw(req, ret, 0);
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return 0;
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}
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}
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@ -1477,59 +1497,79 @@ static inline ssize_t aio_ret(struct kiocb *req, ssize_t ret)
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static ssize_t aio_read(struct kiocb *req, struct iocb *iocb, bool vectored,
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bool compat)
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{
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struct file *file = req->ki_filp;
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struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
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struct iov_iter iter;
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struct file *file;
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ssize_t ret;
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ret = aio_prep_rw(req, iocb);
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if (ret)
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return ret;
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file = req->ki_filp;
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ret = -EBADF;
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if (unlikely(!(file->f_mode & FMODE_READ)))
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return -EBADF;
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goto out_fput;
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ret = -EINVAL;
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if (unlikely(!file->f_op->read_iter))
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return -EINVAL;
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goto out_fput;
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ret = aio_setup_rw(READ, iocb, &iovec, vectored, compat, &iter);
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if (ret)
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return ret;
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goto out_fput;
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ret = rw_verify_area(READ, file, &req->ki_pos, iov_iter_count(&iter));
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if (!ret)
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ret = aio_ret(req, call_read_iter(file, req, &iter));
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ret = aio_rw_ret(req, call_read_iter(file, req, &iter));
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kfree(iovec);
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out_fput:
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if (unlikely(ret && ret != -EIOCBQUEUED))
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fput(file);
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return ret;
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}
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static ssize_t aio_write(struct kiocb *req, struct iocb *iocb, bool vectored,
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bool compat)
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{
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struct file *file = req->ki_filp;
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struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
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struct iov_iter iter;
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struct file *file;
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ssize_t ret;
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ret = aio_prep_rw(req, iocb);
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if (ret)
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return ret;
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file = req->ki_filp;
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ret = -EBADF;
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if (unlikely(!(file->f_mode & FMODE_WRITE)))
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return -EBADF;
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goto out_fput;
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ret = -EINVAL;
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if (unlikely(!file->f_op->write_iter))
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return -EINVAL;
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goto out_fput;
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ret = aio_setup_rw(WRITE, iocb, &iovec, vectored, compat, &iter);
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if (ret)
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return ret;
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goto out_fput;
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ret = rw_verify_area(WRITE, file, &req->ki_pos, iov_iter_count(&iter));
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if (!ret) {
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/*
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* Open-code file_start_write here to grab freeze protection,
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* which will be released by another thread in aio_complete().
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* Fool lockdep by telling it the lock got released so that it
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* doesn't complain about the held lock when we return to
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* userspace.
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* which will be released by another thread in
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* aio_complete_rw(). Fool lockdep by telling it the lock got
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* released so that it doesn't complain about the held lock when
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* we return to userspace.
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*/
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if (S_ISREG(file_inode(file)->i_mode)) {
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__sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
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__sb_writers_release(file_inode(file)->i_sb, SB_FREEZE_WRITE);
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}
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req->ki_flags |= IOCB_WRITE;
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ret = aio_ret(req, call_write_iter(file, req, &iter));
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ret = aio_rw_ret(req, call_write_iter(file, req, &iter));
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}
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kfree(iovec);
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out_fput:
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if (unlikely(ret && ret != -EIOCBQUEUED))
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fput(file);
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return ret;
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}
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@ -1537,7 +1577,6 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
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struct iocb *iocb, bool compat)
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{
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struct aio_kiocb *req;
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struct file *file;
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ssize_t ret;
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/* enforce forwards compatibility on users */
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@ -1560,16 +1599,6 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
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if (unlikely(!req))
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return -EAGAIN;
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req->common.ki_filp = file = fget(iocb->aio_fildes);
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if (unlikely(!req->common.ki_filp)) {
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ret = -EBADF;
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goto out_put_req;
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}
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req->common.ki_pos = iocb->aio_offset;
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req->common.ki_complete = aio_complete;
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req->common.ki_flags = iocb_flags(req->common.ki_filp);
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req->common.ki_hint = file_write_hint(file);
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if (iocb->aio_flags & IOCB_FLAG_RESFD) {
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/*
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* If the IOCB_FLAG_RESFD flag of aio_flags is set, get an
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@ -1583,14 +1612,6 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
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req->ki_eventfd = NULL;
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goto out_put_req;
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}
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req->common.ki_flags |= IOCB_EVENTFD;
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}
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ret = kiocb_set_rw_flags(&req->common, iocb->aio_rw_flags);
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if (unlikely(ret)) {
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pr_debug("EINVAL: aio_rw_flags\n");
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goto out_put_req;
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}
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ret = put_user(KIOCB_KEY, &user_iocb->aio_key);
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@ -1604,16 +1625,16 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
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switch (iocb->aio_lio_opcode) {
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case IOCB_CMD_PREAD:
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ret = aio_read(&req->common, iocb, false, compat);
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ret = aio_read(&req->rw, iocb, false, compat);
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break;
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case IOCB_CMD_PWRITE:
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ret = aio_write(&req->common, iocb, false, compat);
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ret = aio_write(&req->rw, iocb, false, compat);
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break;
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case IOCB_CMD_PREADV:
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ret = aio_read(&req->common, iocb, true, compat);
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ret = aio_read(&req->rw, iocb, true, compat);
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break;
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case IOCB_CMD_PWRITEV:
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ret = aio_write(&req->common, iocb, true, compat);
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ret = aio_write(&req->rw, iocb, true, compat);
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break;
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default:
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pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode);
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@ -1633,7 +1654,9 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
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out_put_req:
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put_reqs_available(ctx, 1);
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percpu_ref_put(&ctx->reqs);
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kiocb_free(req);
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if (req->ki_eventfd)
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eventfd_ctx_put(req->ki_eventfd);
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kmem_cache_free(kiocb_cachep, req);
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return ret;
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}
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