From patchwork Wed Mar 8 14:37:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13165956 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6FCF1C678D5 for ; Wed, 8 Mar 2023 14:38:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 128A96B0080; Wed, 8 Mar 2023 09:38:29 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0D9916B0081; Wed, 8 Mar 2023 09:38:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E93F86B0082; Wed, 8 Mar 2023 09:38:28 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id D8ED76B0080 for ; Wed, 8 Mar 2023 09:38:28 -0500 (EST) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 956271C5FFD for ; Wed, 8 Mar 2023 14:38:28 +0000 (UTC) X-FDA: 80545986696.07.86ABC52 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf11.hostedemail.com (Postfix) with ESMTP id A55CF40008 for ; Wed, 8 Mar 2023 14:38:26 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=KMG6w74U; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf11.hostedemail.com: domain of dhowells@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=dhowells@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1678286306; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=XsRpjIP88f7UuB0TiBadjal83kAgF2un+t2WHwzlM/w=; b=qoy5Lpmv7FzdYb96hvKUbujZB5HxLST57NjczjATLOQ3Occizo3lzfzqPjXzY8gI82MQ0l Xf0hPyapQoGT8zHvGIQSFz3jaGCE/CQj+/KUvJd4VR9Ovlwbuuev//7CrfcIMSeluzh0SR 1cq+9SfnnSdrTKz0+BQA9YY1I23bYnE= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=KMG6w74U; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf11.hostedemail.com: domain of dhowells@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=dhowells@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1678286306; a=rsa-sha256; cv=none; b=IsQ0Afs0jGkps8OStZSoE8FaOCAUnRK4cVp1jl9AFH2OrePVbbMqd3hBvvogjnpooZNLgN 8TIAJfPi35c+a/wLuexwv168IsbNIUPcsQfWuoWoIiHbXYCxA6vBgRHa4CZlMmO76d4M5e QY7woLlie0X1O4MkWbOVEVdi3CYP1eQ= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1678286306; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XsRpjIP88f7UuB0TiBadjal83kAgF2un+t2WHwzlM/w=; b=KMG6w74U446V2PqskT2+hkK1y8CGvdTEKUvKYTp7ERsF5hFzsXiuBC4z2id7R91Bgxn/3S FB7eoWoaVspcx8xQlbtMEKGYMKlaxCIkIbPuxkTbARq3hQh4g0tQih2FS6v73YBS4OFevl lykG5SBc1XD+euygwjPMSFMRlGBEEu8= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-324-tX-bSsmGPty3GOtIlEwCIQ-1; Wed, 08 Mar 2023 09:38:20 -0500 X-MC-Unique: tX-bSsmGPty3GOtIlEwCIQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CF3C2811E6E; Wed, 8 Mar 2023 14:38:19 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id AB7E6C15BA0; Wed, 8 Mar 2023 14:38:17 +0000 (UTC) From: David Howells To: Jens Axboe , Al Viro , Christoph Hellwig Cc: David Howells , Matthew Wilcox , Jan Kara , Jeff Layton , David Hildenbrand , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , John Hubbard Subject: [PATCH v16 07/13] iov_iter: Kill ITER_PIPE Date: Wed, 8 Mar 2023 14:37:48 +0000 Message-Id: <20230308143754.1976726-8-dhowells@redhat.com> In-Reply-To: <20230308143754.1976726-1-dhowells@redhat.com> References: <20230308143754.1976726-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: A55CF40008 X-Stat-Signature: zpbgbej1jstuu19kq9tgwfuszouy5ziy X-HE-Tag: 1678286306-157991 X-HE-Meta: U2FsdGVkX18LD5/Yky4xR85q4+zyGpVls5digfAfqlvv/Q7FqJxhO+7cdcYZGBShcAIIgWhcE2Xyh2RZxbFB28KzfAcnFt1J7kXBhh1++YtOFoqTMVS850TBaKCTvCDQ7qtO29ZByPlDbeeJQn7EAFAjNPU9N2NMV/EigtdAk2eGJ4YlxaULXvxxv3WI7VGjWKY9jOXt+zPqZC/A+KYpNRiDxR0C0+GyBvxn9sPJGJdD0Ye4v22hN6+HECVCV+8CDD4qc/spTEAez1j55623eYHqSNPYOa8DT31mFQ4DWwp80dycWozddpmUMsR38WhtVUxon4OgfHtxJQIPQ/9snKRx+a9qfc9UsjvxXkoCkgAuyVtn6mA16NlHUN3zfOLa0oVO6WQYEomdDUInj9bWHLGVWpVp50MoMRR7OsesMy8MnFfEDFa0uSGybOiOiqNu93FdhsEiIr7flIwjOOM9jbsWt5i//jb8n814ZH22UCvbwQdxITh+pgmWujQlyOdLdDjDCecf3DUjcmF5H/c+fkwBAWEGns831RDumk/q7WNeHPoYhxotlkCEh+pHbMZtxSyVCdeI0Pr/uF3nHkP223emQJ71ktKZRQxIlH0+UhH8vojZHUjwiyfS50/3GxCJqNaXU3PS+pY6DLfpNpN7rmMQ9lL2GiIZN/zuQeqoHxWxNnJm0cz+uG3LxQ1hcIASt8EFcRRArLR2Xe0EnHEp6pBz/FuoCeH111PBpB8yBd0rzICH9O0pddv+KDe1X97DvTN0PQbUJ5nu8Pok/BblB2kUfyguAThHgUpk0b7wD3yRMrMyvaAKi0WrS8Ncl9gHEMBM1yvQL8asbMuDHPuGOZrek7+RVD0jkYxL6DdNob73Ui336J0/4/IW35nA290CFnP9cwKRN5ZX8oMwNVsgtll14MV6W9xXGtMgsBQZakDoLJbIs7RmJBzreVnOKgtcCWB4tIUGiLQBqGs17f7 Zgz+r00b ISpVYBY4crpZ0w4O9GQqzwmVubwrHYYro5tEeeB45fA/JpeT6sIKDaxZAvOvhV7BjbllAL2yv9RtVqHiO+d1UJl1FrtilylATsxMdzN7myo4KOW8hDe/0tgWvaa6x63Wsyl+0LmwZ/NliJSKeEzjIBrvtQsJ/VFcMQqW8A1ZWu2kUDb20D3oetpHZ0WBK+wiFFsSTLQL4baL/7u1uvqR4bkTXeLgNAVYFjvHHzLehjHu4V+3tWtl3Uh7f78NsVQBGalpw1IuW2Pvb0phh1+EfmbhnZbnpaZYSC48b+viHVsXt5o3wNCDeuIxmcy+CKstp1muNBv4SwwCzF+XN5pwJ+kLm01UccbtIJRMPzT5a+wcNP6jHjG/jxGT79udYr8m/bAA7+0IlVJ4OXx9RMECImm+W/5XZzNYFE6qV6OaT86J1f/oT8j0Weeu+rMpaB5m1P2Le X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The ITER_PIPE-type iterator was only used for generic_file_splice_read(), but that has now been switched to either pull pages directly from the pagecache for buffered file splice-reads or to use ITER_BVEC instead for O_DIRECT file splice-reads. This leaves ITER_PIPE unused - so remove it. Signed-off-by: David Howells Reviewed-by: Christoph Hellwig cc: Jens Axboe cc: Al Viro cc: David Hildenbrand cc: John Hubbard cc: linux-mm@kvack.org cc: linux-block@vger.kernel.org cc: linux-fsdevel@vger.kernel.org --- include/linux/uio.h | 14 -- lib/iov_iter.c | 429 +------------------------------------------- mm/filemap.c | 3 +- 3 files changed, 4 insertions(+), 442 deletions(-) diff --git a/include/linux/uio.h b/include/linux/uio.h index 27e3fd942960..74598426edb4 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -11,7 +11,6 @@ #include struct page; -struct pipe_inode_info; typedef unsigned int __bitwise iov_iter_extraction_t; @@ -25,7 +24,6 @@ enum iter_type { ITER_IOVEC, ITER_KVEC, ITER_BVEC, - ITER_PIPE, ITER_XARRAY, ITER_DISCARD, ITER_UBUF, @@ -55,15 +53,10 @@ struct iov_iter { const struct kvec *kvec; const struct bio_vec *bvec; struct xarray *xarray; - struct pipe_inode_info *pipe; void __user *ubuf; }; union { unsigned long nr_segs; - struct { - unsigned int head; - unsigned int start_head; - }; loff_t xarray_start; }; }; @@ -101,11 +94,6 @@ static inline bool iov_iter_is_bvec(const struct iov_iter *i) return iov_iter_type(i) == ITER_BVEC; } -static inline bool iov_iter_is_pipe(const struct iov_iter *i) -{ - return iov_iter_type(i) == ITER_PIPE; -} - static inline bool iov_iter_is_discard(const struct iov_iter *i) { return iov_iter_type(i) == ITER_DISCARD; @@ -247,8 +235,6 @@ void iov_iter_kvec(struct iov_iter *i, unsigned int direction, const struct kvec unsigned long nr_segs, size_t count); void iov_iter_bvec(struct iov_iter *i, unsigned int direction, const struct bio_vec *bvec, unsigned long nr_segs, size_t count); -void iov_iter_pipe(struct iov_iter *i, unsigned int direction, struct pipe_inode_info *pipe, - size_t count); void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count); void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *xarray, loff_t start, size_t count); diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 274014e4eafe..fad95e4cf372 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -14,8 +14,6 @@ #include #include -#define PIPE_PARANOIA /* for now */ - /* covers ubuf and kbuf alike */ #define iterate_buf(i, n, base, len, off, __p, STEP) { \ size_t __maybe_unused off = 0; \ @@ -186,150 +184,6 @@ static int copyin(void *to, const void __user *from, size_t n) return res; } -#ifdef PIPE_PARANOIA -static bool sanity(const struct iov_iter *i) -{ - struct pipe_inode_info *pipe = i->pipe; - unsigned int p_head = pipe->head; - unsigned int p_tail = pipe->tail; - unsigned int p_occupancy = pipe_occupancy(p_head, p_tail); - unsigned int i_head = i->head; - unsigned int idx; - - if (i->last_offset) { - struct pipe_buffer *p; - if (unlikely(p_occupancy == 0)) - goto Bad; // pipe must be non-empty - if (unlikely(i_head != p_head - 1)) - goto Bad; // must be at the last buffer... - - p = pipe_buf(pipe, i_head); - if (unlikely(p->offset + p->len != abs(i->last_offset))) - goto Bad; // ... at the end of segment - } else { - if (i_head != p_head) - goto Bad; // must be right after the last buffer - } - return true; -Bad: - printk(KERN_ERR "idx = %d, offset = %d\n", i_head, i->last_offset); - printk(KERN_ERR "head = %d, tail = %d, buffers = %d\n", - p_head, p_tail, pipe->ring_size); - for (idx = 0; idx < pipe->ring_size; idx++) - printk(KERN_ERR "[%p %p %d %d]\n", - pipe->bufs[idx].ops, - pipe->bufs[idx].page, - pipe->bufs[idx].offset, - pipe->bufs[idx].len); - WARN_ON(1); - return false; -} -#else -#define sanity(i) true -#endif - -static struct page *push_anon(struct pipe_inode_info *pipe, unsigned size) -{ - struct page *page = alloc_page(GFP_USER); - if (page) { - struct pipe_buffer *buf = pipe_buf(pipe, pipe->head++); - *buf = (struct pipe_buffer) { - .ops = &default_pipe_buf_ops, - .page = page, - .offset = 0, - .len = size - }; - } - return page; -} - -static void push_page(struct pipe_inode_info *pipe, struct page *page, - unsigned int offset, unsigned int size) -{ - struct pipe_buffer *buf = pipe_buf(pipe, pipe->head++); - *buf = (struct pipe_buffer) { - .ops = &page_cache_pipe_buf_ops, - .page = page, - .offset = offset, - .len = size - }; - get_page(page); -} - -static inline int last_offset(const struct pipe_buffer *buf) -{ - if (buf->ops == &default_pipe_buf_ops) - return buf->len; // buf->offset is 0 for those - else - return -(buf->offset + buf->len); -} - -static struct page *append_pipe(struct iov_iter *i, size_t size, - unsigned int *off) -{ - struct pipe_inode_info *pipe = i->pipe; - int offset = i->last_offset; - struct pipe_buffer *buf; - struct page *page; - - if (offset > 0 && offset < PAGE_SIZE) { - // some space in the last buffer; add to it - buf = pipe_buf(pipe, pipe->head - 1); - size = min_t(size_t, size, PAGE_SIZE - offset); - buf->len += size; - i->last_offset += size; - i->count -= size; - *off = offset; - return buf->page; - } - // OK, we need a new buffer - *off = 0; - size = min_t(size_t, size, PAGE_SIZE); - if (pipe_full(pipe->head, pipe->tail, pipe->max_usage)) - return NULL; - page = push_anon(pipe, size); - if (!page) - return NULL; - i->head = pipe->head - 1; - i->last_offset = size; - i->count -= size; - return page; -} - -static size_t copy_page_to_iter_pipe(struct page *page, size_t offset, size_t bytes, - struct iov_iter *i) -{ - struct pipe_inode_info *pipe = i->pipe; - unsigned int head = pipe->head; - - if (unlikely(bytes > i->count)) - bytes = i->count; - - if (unlikely(!bytes)) - return 0; - - if (!sanity(i)) - return 0; - - if (offset && i->last_offset == -offset) { // could we merge it? - struct pipe_buffer *buf = pipe_buf(pipe, head - 1); - if (buf->page == page) { - buf->len += bytes; - i->last_offset -= bytes; - i->count -= bytes; - return bytes; - } - } - if (pipe_full(pipe->head, pipe->tail, pipe->max_usage)) - return 0; - - push_page(pipe, page, offset, bytes); - i->last_offset = -(offset + bytes); - i->head = head; - i->count -= bytes; - return bytes; -} - /* * fault_in_iov_iter_readable - fault in iov iterator for reading * @i: iterator @@ -433,46 +287,6 @@ void iov_iter_init(struct iov_iter *i, unsigned int direction, } EXPORT_SYMBOL(iov_iter_init); -// returns the offset in partial buffer (if any) -static inline unsigned int pipe_npages(const struct iov_iter *i, int *npages) -{ - struct pipe_inode_info *pipe = i->pipe; - int used = pipe->head - pipe->tail; - int off = i->last_offset; - - *npages = max((int)pipe->max_usage - used, 0); - - if (off > 0 && off < PAGE_SIZE) { // anon and not full - (*npages)++; - return off; - } - return 0; -} - -static size_t copy_pipe_to_iter(const void *addr, size_t bytes, - struct iov_iter *i) -{ - unsigned int off, chunk; - - if (unlikely(bytes > i->count)) - bytes = i->count; - if (unlikely(!bytes)) - return 0; - - if (!sanity(i)) - return 0; - - for (size_t n = bytes; n; n -= chunk) { - struct page *page = append_pipe(i, n, &off); - chunk = min_t(size_t, n, PAGE_SIZE - off); - if (!page) - return bytes - n; - memcpy_to_page(page, off, addr, chunk); - addr += chunk; - } - return bytes; -} - static __wsum csum_and_memcpy(void *to, const void *from, size_t len, __wsum sum, size_t off) { @@ -480,44 +294,10 @@ static __wsum csum_and_memcpy(void *to, const void *from, size_t len, return csum_block_add(sum, next, off); } -static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes, - struct iov_iter *i, __wsum *sump) -{ - __wsum sum = *sump; - size_t off = 0; - unsigned int chunk, r; - - if (unlikely(bytes > i->count)) - bytes = i->count; - if (unlikely(!bytes)) - return 0; - - if (!sanity(i)) - return 0; - - while (bytes) { - struct page *page = append_pipe(i, bytes, &r); - char *p; - - if (!page) - break; - chunk = min_t(size_t, bytes, PAGE_SIZE - r); - p = kmap_local_page(page); - sum = csum_and_memcpy(p + r, addr + off, chunk, sum, off); - kunmap_local(p); - off += chunk; - bytes -= chunk; - } - *sump = sum; - return off; -} - size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i) { if (WARN_ON_ONCE(i->data_source)) return 0; - if (unlikely(iov_iter_is_pipe(i))) - return copy_pipe_to_iter(addr, bytes, i); if (user_backed_iter(i)) might_fault(); iterate_and_advance(i, bytes, base, len, off, @@ -539,42 +319,6 @@ static int copyout_mc(void __user *to, const void *from, size_t n) return n; } -static size_t copy_mc_pipe_to_iter(const void *addr, size_t bytes, - struct iov_iter *i) -{ - size_t xfer = 0; - unsigned int off, chunk; - - if (unlikely(bytes > i->count)) - bytes = i->count; - if (unlikely(!bytes)) - return 0; - - if (!sanity(i)) - return 0; - - while (bytes) { - struct page *page = append_pipe(i, bytes, &off); - unsigned long rem; - char *p; - - if (!page) - break; - chunk = min_t(size_t, bytes, PAGE_SIZE - off); - p = kmap_local_page(page); - rem = copy_mc_to_kernel(p + off, addr + xfer, chunk); - chunk -= rem; - kunmap_local(p); - xfer += chunk; - bytes -= chunk; - if (rem) { - iov_iter_revert(i, rem); - break; - } - } - return xfer; -} - /** * _copy_mc_to_iter - copy to iter with source memory error exception handling * @addr: source kernel address @@ -594,9 +338,8 @@ static size_t copy_mc_pipe_to_iter(const void *addr, size_t bytes, * alignment and poison alignment assumptions to avoid re-triggering * hardware exceptions. * - * * ITER_KVEC, ITER_PIPE, and ITER_BVEC can return short copies. - * Compare to copy_to_iter() where only ITER_IOVEC attempts might return - * a short copy. + * * ITER_KVEC and ITER_BVEC can return short copies. Compare to + * copy_to_iter() where only ITER_IOVEC attempts might return a short copy. * * Return: number of bytes copied (may be %0) */ @@ -604,8 +347,6 @@ size_t _copy_mc_to_iter(const void *addr, size_t bytes, struct iov_iter *i) { if (WARN_ON_ONCE(i->data_source)) return 0; - if (unlikely(iov_iter_is_pipe(i))) - return copy_mc_pipe_to_iter(addr, bytes, i); if (user_backed_iter(i)) might_fault(); __iterate_and_advance(i, bytes, base, len, off, @@ -711,8 +452,6 @@ size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes, return 0; if (WARN_ON_ONCE(i->data_source)) return 0; - if (unlikely(iov_iter_is_pipe(i))) - return copy_page_to_iter_pipe(page, offset, bytes, i); page += offset / PAGE_SIZE; // first subpage offset %= PAGE_SIZE; while (1) { @@ -761,36 +500,8 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, } EXPORT_SYMBOL(copy_page_from_iter); -static size_t pipe_zero(size_t bytes, struct iov_iter *i) -{ - unsigned int chunk, off; - - if (unlikely(bytes > i->count)) - bytes = i->count; - if (unlikely(!bytes)) - return 0; - - if (!sanity(i)) - return 0; - - for (size_t n = bytes; n; n -= chunk) { - struct page *page = append_pipe(i, n, &off); - char *p; - - if (!page) - return bytes - n; - chunk = min_t(size_t, n, PAGE_SIZE - off); - p = kmap_local_page(page); - memset(p + off, 0, chunk); - kunmap_local(p); - } - return bytes; -} - size_t iov_iter_zero(size_t bytes, struct iov_iter *i) { - if (unlikely(iov_iter_is_pipe(i))) - return pipe_zero(bytes, i); iterate_and_advance(i, bytes, base, len, count, clear_user(base, len), memset(base, 0, len) @@ -821,32 +532,6 @@ size_t copy_page_from_iter_atomic(struct page *page, unsigned offset, size_t byt } EXPORT_SYMBOL(copy_page_from_iter_atomic); -static void pipe_advance(struct iov_iter *i, size_t size) -{ - struct pipe_inode_info *pipe = i->pipe; - int off = i->last_offset; - - if (!off && !size) { - pipe_discard_from(pipe, i->start_head); // discard everything - return; - } - i->count -= size; - while (1) { - struct pipe_buffer *buf = pipe_buf(pipe, i->head); - if (off) /* make it relative to the beginning of buffer */ - size += abs(off) - buf->offset; - if (size <= buf->len) { - buf->len = size; - i->last_offset = last_offset(buf); - break; - } - size -= buf->len; - i->head++; - off = 0; - } - pipe_discard_from(pipe, i->head + 1); // discard everything past this one -} - static void iov_iter_bvec_advance(struct iov_iter *i, size_t size) { const struct bio_vec *bvec, *end; @@ -898,8 +583,6 @@ void iov_iter_advance(struct iov_iter *i, size_t size) iov_iter_iovec_advance(i, size); } else if (iov_iter_is_bvec(i)) { iov_iter_bvec_advance(i, size); - } else if (iov_iter_is_pipe(i)) { - pipe_advance(i, size); } else if (iov_iter_is_discard(i)) { i->count -= size; } @@ -913,26 +596,6 @@ void iov_iter_revert(struct iov_iter *i, size_t unroll) if (WARN_ON(unroll > MAX_RW_COUNT)) return; i->count += unroll; - if (unlikely(iov_iter_is_pipe(i))) { - struct pipe_inode_info *pipe = i->pipe; - unsigned int head = pipe->head; - - while (head > i->start_head) { - struct pipe_buffer *b = pipe_buf(pipe, --head); - if (unroll < b->len) { - b->len -= unroll; - i->last_offset = last_offset(b); - i->head = head; - return; - } - unroll -= b->len; - pipe_buf_release(pipe, b); - pipe->head--; - } - i->last_offset = 0; - i->head = head; - return; - } if (unlikely(iov_iter_is_discard(i))) return; if (unroll <= i->iov_offset) { @@ -1020,24 +683,6 @@ void iov_iter_bvec(struct iov_iter *i, unsigned int direction, } EXPORT_SYMBOL(iov_iter_bvec); -void iov_iter_pipe(struct iov_iter *i, unsigned int direction, - struct pipe_inode_info *pipe, - size_t count) -{ - BUG_ON(direction != READ); - WARN_ON(pipe_full(pipe->head, pipe->tail, pipe->ring_size)); - *i = (struct iov_iter){ - .iter_type = ITER_PIPE, - .data_source = false, - .pipe = pipe, - .head = pipe->head, - .start_head = pipe->head, - .last_offset = 0, - .count = count - }; -} -EXPORT_SYMBOL(iov_iter_pipe); - /** * iov_iter_xarray - Initialise an I/O iterator to use the pages in an xarray * @i: The iterator to initialise. @@ -1162,19 +807,6 @@ bool iov_iter_is_aligned(const struct iov_iter *i, unsigned addr_mask, if (iov_iter_is_bvec(i)) return iov_iter_aligned_bvec(i, addr_mask, len_mask); - if (iov_iter_is_pipe(i)) { - size_t size = i->count; - - if (size & len_mask) - return false; - if (size && i->last_offset > 0) { - if (i->last_offset & addr_mask) - return false; - } - - return true; - } - if (iov_iter_is_xarray(i)) { if (i->count & len_mask) return false; @@ -1244,14 +876,6 @@ unsigned long iov_iter_alignment(const struct iov_iter *i) if (iov_iter_is_bvec(i)) return iov_iter_alignment_bvec(i); - if (iov_iter_is_pipe(i)) { - size_t size = i->count; - - if (size && i->last_offset > 0) - return size | i->last_offset; - return size; - } - if (iov_iter_is_xarray(i)) return (i->xarray_start + i->iov_offset) | i->count; @@ -1303,36 +927,6 @@ static int want_pages_array(struct page ***res, size_t size, return count; } -static ssize_t pipe_get_pages(struct iov_iter *i, - struct page ***pages, size_t maxsize, unsigned maxpages, - size_t *start) -{ - unsigned int npages, count, off, chunk; - struct page **p; - size_t left; - - if (!sanity(i)) - return -EFAULT; - - *start = off = pipe_npages(i, &npages); - if (!npages) - return -EFAULT; - count = want_pages_array(pages, maxsize, off, min(npages, maxpages)); - if (!count) - return -ENOMEM; - p = *pages; - for (npages = 0, left = maxsize ; npages < count; npages++, left -= chunk) { - struct page *page = append_pipe(i, left, &off); - if (!page) - break; - chunk = min_t(size_t, left, PAGE_SIZE - off); - get_page(*p++ = page); - } - if (!npages) - return -EFAULT; - return maxsize - left; -} - static ssize_t iter_xarray_populate_pages(struct page **pages, struct xarray *xa, pgoff_t index, unsigned int nr_pages) { @@ -1482,8 +1076,6 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i, } return maxsize; } - if (iov_iter_is_pipe(i)) - return pipe_get_pages(i, pages, maxsize, maxpages, start); if (iov_iter_is_xarray(i)) return iter_xarray_get_pages(i, pages, maxsize, maxpages, start); return -EFAULT; @@ -1573,9 +1165,7 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *_csstate, } sum = csum_shift(csstate->csum, csstate->off); - if (unlikely(iov_iter_is_pipe(i))) - bytes = csum_and_copy_to_pipe_iter(addr, bytes, i, &sum); - else iterate_and_advance(i, bytes, base, len, off, ({ + iterate_and_advance(i, bytes, base, len, off, ({ next = csum_and_copy_to_user(addr + off, base, len); sum = csum_block_add(sum, next, off); next ? 0 : len; @@ -1660,15 +1250,6 @@ int iov_iter_npages(const struct iov_iter *i, int maxpages) return iov_npages(i, maxpages); if (iov_iter_is_bvec(i)) return bvec_npages(i, maxpages); - if (iov_iter_is_pipe(i)) { - int npages; - - if (!sanity(i)) - return 0; - - pipe_npages(i, &npages); - return min(npages, maxpages); - } if (iov_iter_is_xarray(i)) { unsigned offset = (i->xarray_start + i->iov_offset) % PAGE_SIZE; int npages = DIV_ROUND_UP(offset + i->count, PAGE_SIZE); @@ -1681,10 +1262,6 @@ EXPORT_SYMBOL(iov_iter_npages); const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags) { *new = *old; - if (unlikely(iov_iter_is_pipe(new))) { - WARN_ON(1); - return NULL; - } if (iov_iter_is_bvec(new)) return new->bvec = kmemdup(new->bvec, new->nr_segs * sizeof(struct bio_vec), diff --git a/mm/filemap.c b/mm/filemap.c index 3a93515ae2ed..470be06b6096 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2690,8 +2690,7 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, if (unlikely(iocb->ki_pos >= i_size_read(inode))) break; - error = filemap_get_pages(iocb, iter->count, &fbatch, - iov_iter_is_pipe(iter)); + error = filemap_get_pages(iocb, iter->count, &fbatch, false); if (error < 0) break;