From patchwork Wed Sep 1 17:01:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 12469895 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C017EC25AEB for ; Wed, 1 Sep 2021 17:01:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A15C960FDC for ; Wed, 1 Sep 2021 17:01:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345601AbhIARCk (ORCPT ); Wed, 1 Sep 2021 13:02:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345549AbhIARCf (ORCPT ); Wed, 1 Sep 2021 13:02:35 -0400 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF810C061760 for ; Wed, 1 Sep 2021 10:01:38 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id mw10-20020a17090b4d0a00b0017b59213831so212627pjb.0 for ; Wed, 01 Sep 2021 10:01:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=DqH8MVmzbOcnIXkuJHy815qNGm6EKCokgjSrL6IgzyE=; b=TT8jbAYWWbQ/hVzpnFYN7hOySsQZGRz3hoxQ34gZXf+Aj++UG0Dnd8LjNS20Vw1CTg LdTrfPoYY/syfZKWliTfusAP6y8gqJZpuMo4w1VCybW1laO3nMgJkk6sIJSS0YvtNfQO 38E6EYg7bshfSjL32Rkau31u/zHJLwRfIpmQLt5iabblcsqiJuDZsZTdQ0rmO8mV0hYP iFuGp9Sj6XRywl/BJWWbSQasfxy6rGO+22UYYLl9DCzx+D8nG1w0z0yhs5db9KQm4p8l 2NsBgPawAkCsqgv34Z/GI+rG4wUW5ibQV8UyfPuShQlCtWWq6MDiMykrFZX1w58CdN5o 154Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DqH8MVmzbOcnIXkuJHy815qNGm6EKCokgjSrL6IgzyE=; b=G5blZxULpa7WiYCqMPyiI3pYcuZTZoDDT/VMVyXvfor6h66pX7UJdXVC0fnADr64qG BqGUjbNVFAe54maisad4KXmoCgl9uWzWPybYBhsrTed8zIGlx6pMGE+JAahY+k+nWowB xo9g3nNUSxw1kf5hvbqbNr7ckmK+tCXrHgTohuuWM/ljFd9OV5Kj1/txu5ZQ53/nI2di VemSngduP1tyyn3HBXxajAc4x6e45yNzLmfpuY+D5Cwu6E30ChXk2WK04iNyNjbq6By9 E2+yrHMqh8pUHCNVvpgjBB2m+DG93z6tyHTcWiiG9uPUocecYLetK9IldGGf3RNB7ZN/ g2Gg== X-Gm-Message-State: AOAM530dQxotxkWzQAjt/+CxoohEqXvHP9MOLVnLqT5fWrwte7E3ydbK d18KsP7/A67mPl7cDn+OAqEn7Q== X-Google-Smtp-Source: ABdhPJxwIdMRwxId7VeDJA2WEBuMrMnUhysOJaYAcfF/cslXhRlwz8rvAy8Fk8n+1Ro1FbAJgrjeaQ== X-Received: by 2002:a17:90a:420c:: with SMTP id o12mr282411pjg.101.1630515698187; Wed, 01 Sep 2021 10:01:38 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:a2b2]) by smtp.gmail.com with ESMTPSA id y7sm58642pff.206.2021.09.01.10.01.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Sep 2021 10:01:37 -0700 (PDT) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH v11 08/14] btrfs: add BTRFS_IOC_ENCODED_READ Date: Wed, 1 Sep 2021 10:01:03 -0700 Message-Id: X-Mailer: git-send-email 2.33.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Omar Sandoval There are 4 main cases: 1. Inline extents: we copy the data straight out of the extent buffer. 2. Hole/preallocated extents: we fill in zeroes. 3. Regular, uncompressed extents: we read the sectors we need directly from disk. 4. Regular, compressed extents: we read the entire compressed extent from disk and indicate what subset of the decompressed extent is in the file. This initial implementation simplifies a few things that can be improved in the future: - We hold the inode lock during the operation. - Cases 1, 3, and 4 allocate temporary memory to read into before copying out to userspace. - We don't do read repair, because it turns out that read repair is currently broken for compressed data. Signed-off-by: Omar Sandoval --- fs/btrfs/ctree.h | 4 + fs/btrfs/inode.c | 489 +++++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/ioctl.c | 111 +++++++++++ 3 files changed, 604 insertions(+) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index b95ec5fb68d5..cbd7e07c1c34 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3223,6 +3223,10 @@ int btrfs_writepage_cow_fixup(struct page *page); void btrfs_writepage_endio_finish_ordered(struct btrfs_inode *inode, struct page *page, u64 start, u64 end, bool uptodate); +struct btrfs_ioctl_encoded_io_args; +ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter, + struct btrfs_ioctl_encoded_io_args *encoded); + extern const struct dentry_operations btrfs_dentry_operations; extern const struct iomap_ops btrfs_dio_iomap_ops; extern const struct iomap_dio_ops btrfs_dio_ops; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a87a34f56234..1940f22179ba 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -10500,6 +10500,495 @@ void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end) } } +static int btrfs_encoded_io_compression_from_extent(int compress_type) +{ + switch (compress_type) { + case BTRFS_COMPRESS_NONE: + return BTRFS_ENCODED_IO_COMPRESSION_NONE; + case BTRFS_COMPRESS_ZLIB: + return BTRFS_ENCODED_IO_COMPRESSION_ZLIB; + case BTRFS_COMPRESS_LZO: + /* + * The LZO format depends on the page size. 64k is the maximum + * sectorsize (and thus page size) that we support. + */ + if (PAGE_SIZE < SZ_4K || PAGE_SIZE > SZ_64K) + return -EINVAL; + return BTRFS_ENCODED_IO_COMPRESSION_LZO_4K + (PAGE_SHIFT - 12); + case BTRFS_COMPRESS_ZSTD: + return BTRFS_ENCODED_IO_COMPRESSION_ZSTD; + default: + return -EUCLEAN; + } +} + +static ssize_t btrfs_encoded_read_inline( + struct kiocb *iocb, + struct iov_iter *iter, u64 start, + u64 lockend, + struct extent_state **cached_state, + u64 extent_start, size_t count, + struct btrfs_ioctl_encoded_io_args *encoded, + bool *unlocked) +{ + struct inode *inode = file_inode(iocb->ki_filp); + struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; + struct btrfs_path *path; + struct extent_buffer *leaf; + struct btrfs_file_extent_item *item; + u64 ram_bytes; + unsigned long ptr; + void *tmp; + ssize_t ret; + + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto out; + } + ret = btrfs_lookup_file_extent(NULL, BTRFS_I(inode)->root, path, + btrfs_ino(BTRFS_I(inode)), extent_start, + 0); + if (ret) { + if (ret > 0) { + /* The extent item disappeared? */ + ret = -EIO; + } + goto out; + } + leaf = path->nodes[0]; + item = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + + ram_bytes = btrfs_file_extent_ram_bytes(leaf, item); + ptr = btrfs_file_extent_inline_start(item); + + encoded->len = (min_t(u64, extent_start + ram_bytes, inode->i_size) - + iocb->ki_pos); + ret = btrfs_encoded_io_compression_from_extent( + btrfs_file_extent_compression(leaf, item)); + if (ret < 0) + goto out; + encoded->compression = ret; + if (encoded->compression) { + size_t inline_size; + + inline_size = btrfs_file_extent_inline_item_len(leaf, + btrfs_item_nr(path->slots[0])); + if (inline_size > count) { + ret = -ENOBUFS; + goto out; + } + count = inline_size; + encoded->unencoded_len = ram_bytes; + encoded->unencoded_offset = iocb->ki_pos - extent_start; + } else { + encoded->len = encoded->unencoded_len = count = + min_t(u64, count, encoded->len); + ptr += iocb->ki_pos - extent_start; + } + + tmp = kmalloc(count, GFP_NOFS); + if (!tmp) { + ret = -ENOMEM; + goto out; + } + read_extent_buffer(leaf, tmp, ptr, count); + btrfs_release_path(path); + unlock_extent_cached(io_tree, start, lockend, cached_state); + inode_unlock_shared(inode); + *unlocked = true; + + ret = copy_to_iter(tmp, count, iter); + if (ret != count) + ret = -EFAULT; + kfree(tmp); +out: + btrfs_free_path(path); + return ret; +} + +struct btrfs_encoded_read_private { + struct inode *inode; + wait_queue_head_t wait; + atomic_t pending; + blk_status_t status; + bool skip_csum; +}; + +static blk_status_t submit_encoded_read_bio(struct inode *inode, + struct bio *bio, int mirror_num, + unsigned long bio_flags) +{ + struct btrfs_encoded_read_private *priv = bio->bi_private; + struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + blk_status_t ret; + + if (!priv->skip_csum) { + ret = btrfs_lookup_bio_sums(inode, bio, NULL); + if (ret) + return ret; + } + + ret = btrfs_bio_wq_end_io(fs_info, bio, BTRFS_WQ_ENDIO_DATA); + if (ret) { + btrfs_io_bio_free_csum(io_bio); + return ret; + } + + atomic_inc(&priv->pending); + ret = btrfs_map_bio(fs_info, bio, mirror_num); + if (ret) { + atomic_dec(&priv->pending); + btrfs_io_bio_free_csum(io_bio); + } + return ret; +} + +static blk_status_t btrfs_encoded_read_check_bio(struct btrfs_io_bio *io_bio) +{ + const bool uptodate = io_bio->bio.bi_status == BLK_STS_OK; + struct btrfs_encoded_read_private *priv = io_bio->bio.bi_private; + struct inode *inode = priv->inode; + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + u32 sectorsize = fs_info->sectorsize; + struct bio_vec *bvec; + struct bvec_iter_all iter_all; + u64 start = io_bio->logical; + u32 bio_offset = 0; + + if (priv->skip_csum || !uptodate) + return io_bio->bio.bi_status; + + bio_for_each_segment_all(bvec, &io_bio->bio, iter_all) { + unsigned int i, nr_sectors, pgoff; + + nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info, bvec->bv_len); + pgoff = bvec->bv_offset; + for (i = 0; i < nr_sectors; i++) { + ASSERT(pgoff < PAGE_SIZE); + if (check_data_csum(inode, io_bio, bio_offset, + bvec->bv_page, pgoff, start)) + return BLK_STS_IOERR; + start += sectorsize; + bio_offset += sectorsize; + pgoff += sectorsize; + } + } + return BLK_STS_OK; +} + +static void btrfs_encoded_read_endio(struct bio *bio) +{ + struct btrfs_encoded_read_private *priv = bio->bi_private; + struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); + blk_status_t status; + + status = btrfs_encoded_read_check_bio(io_bio); + if (status) { + /* + * The memory barrier implied by the atomic_dec_return() here + * pairs with the memory barrier implied by the + * atomic_dec_return() or io_wait_event() in + * btrfs_encoded_read_regular_fill_pages() to ensure that this + * write is observed before the load of status in + * btrfs_encoded_read_regular_fill_pages(). + */ + WRITE_ONCE(priv->status, status); + } + if (!atomic_dec_return(&priv->pending)) + wake_up(&priv->wait); + btrfs_io_bio_free_csum(io_bio); + bio_put(bio); +} + +static int btrfs_encoded_read_regular_fill_pages(struct inode *inode, u64 offset, + u64 disk_io_size, struct page **pages) +{ + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + struct btrfs_encoded_read_private priv = { + .inode = inode, + .pending = ATOMIC_INIT(1), + .skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM, + }; + unsigned long i = 0; + u64 cur = 0; + int ret; + + init_waitqueue_head(&priv.wait); + /* + * Submit bios for the extent, splitting due to bio or stripe limits as + * necessary. + */ + while (cur < disk_io_size) { + struct extent_map *em; + struct btrfs_io_geometry geom; + struct bio *bio = NULL; + u64 remaining; + + em = btrfs_get_chunk_map(fs_info, offset + cur, + disk_io_size - cur); + if (IS_ERR(em)) { + ret = PTR_ERR(em); + } else { + ret = btrfs_get_io_geometry(fs_info, em, BTRFS_MAP_READ, + offset + cur, &geom); + free_extent_map(em); + } + if (ret) { + WRITE_ONCE(priv.status, errno_to_blk_status(ret)); + break; + } + remaining = min(geom.len, disk_io_size - cur); + while (bio || remaining) { + size_t bytes = min_t(u64, remaining, PAGE_SIZE); + + if (!bio) { + bio = btrfs_bio_alloc(offset + cur); + bio->bi_end_io = btrfs_encoded_read_endio; + bio->bi_private = &priv; + bio->bi_opf = REQ_OP_READ; + } + + if (!bytes || + bio_add_page(bio, pages[i], bytes, 0) < bytes) { + blk_status_t status; + + status = submit_encoded_read_bio(inode, bio, 0, + 0); + if (status) { + WRITE_ONCE(priv.status, status); + bio_put(bio); + goto out; + } + bio = NULL; + continue; + } + + i++; + cur += bytes; + remaining -= bytes; + } + } + +out: + if (atomic_dec_return(&priv.pending)) + io_wait_event(priv.wait, !atomic_read(&priv.pending)); + /* See btrfs_encoded_read_endio() for ordering. */ + return blk_status_to_errno(READ_ONCE(priv.status)); +} + +static ssize_t btrfs_encoded_read_regular(struct kiocb *iocb, + struct iov_iter *iter, + u64 start, u64 lockend, + struct extent_state **cached_state, + u64 offset, u64 disk_io_size, + size_t count, bool compressed, + bool *unlocked) +{ + struct inode *inode = file_inode(iocb->ki_filp); + struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; + struct page **pages; + unsigned long nr_pages, i; + u64 cur; + size_t page_offset; + ssize_t ret; + + nr_pages = DIV_ROUND_UP(disk_io_size, PAGE_SIZE); + pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); + if (!pages) + return -ENOMEM; + for (i = 0; i < nr_pages; i++) { + pages[i] = alloc_page(GFP_NOFS | __GFP_HIGHMEM); + if (!pages[i]) { + ret = -ENOMEM; + goto out; + } + } + + ret = btrfs_encoded_read_regular_fill_pages(inode, offset, disk_io_size, + pages); + if (ret) + goto out; + + unlock_extent_cached(io_tree, start, lockend, cached_state); + inode_unlock_shared(inode); + *unlocked = true; + + if (compressed) { + i = 0; + page_offset = 0; + } else { + i = (iocb->ki_pos - start) >> PAGE_SHIFT; + page_offset = (iocb->ki_pos - start) & (PAGE_SIZE - 1); + } + cur = 0; + while (cur < count) { + size_t bytes = min_t(size_t, count - cur, + PAGE_SIZE - page_offset); + + if (copy_page_to_iter(pages[i], page_offset, bytes, + iter) != bytes) { + ret = -EFAULT; + goto out; + } + i++; + cur += bytes; + page_offset = 0; + } + ret = count; +out: + for (i = 0; i < nr_pages; i++) { + if (pages[i]) + __free_page(pages[i]); + } + kfree(pages); + return ret; +} + +ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter, + struct btrfs_ioctl_encoded_io_args *encoded) +{ + struct inode *inode = file_inode(iocb->ki_filp); + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; + ssize_t ret; + size_t count = iov_iter_count(iter); + u64 start, lockend, offset, disk_io_size; + struct extent_state *cached_state = NULL; + struct extent_map *em; + bool unlocked = false; + + file_accessed(iocb->ki_filp); + + inode_lock_shared(inode); + + if (iocb->ki_pos >= inode->i_size) { + inode_unlock_shared(inode); + return 0; + } + start = ALIGN_DOWN(iocb->ki_pos, fs_info->sectorsize); + /* + * We don't know how long the extent containing iocb->ki_pos is, but if + * it's compressed we know that it won't be longer than this. + */ + lockend = start + BTRFS_MAX_UNCOMPRESSED - 1; + + for (;;) { + struct btrfs_ordered_extent *ordered; + + ret = btrfs_wait_ordered_range(inode, start, + lockend - start + 1); + if (ret) + goto out_unlock_inode; + lock_extent_bits(io_tree, start, lockend, &cached_state); + ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), start, + lockend - start + 1); + if (!ordered) + break; + btrfs_put_ordered_extent(ordered); + unlock_extent_cached(io_tree, start, lockend, &cached_state); + cond_resched(); + } + + em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, + lockend - start + 1); + if (IS_ERR(em)) { + ret = PTR_ERR(em); + goto out_unlock_extent; + } + + if (em->block_start == EXTENT_MAP_INLINE) { + u64 extent_start = em->start; + + /* + * For inline extents we get everything we need out of the + * extent item. + */ + free_extent_map(em); + em = NULL; + ret = btrfs_encoded_read_inline(iocb, iter, start, lockend, + &cached_state, extent_start, + count, encoded, &unlocked); + goto out; + } + + /* + * We only want to return up to EOF even if the extent extends beyond + * that. + */ + encoded->len = (min_t(u64, extent_map_end(em), inode->i_size) - + iocb->ki_pos); + if (em->block_start == EXTENT_MAP_HOLE || + test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { + offset = EXTENT_MAP_HOLE; + encoded->len = encoded->unencoded_len = count = + min_t(u64, count, encoded->len); + } else if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { + offset = em->block_start; + /* + * Bail if the buffer isn't large enough to return the whole + * compressed extent. + */ + if (em->block_len > count) { + ret = -ENOBUFS; + goto out_em; + } + disk_io_size = count = em->block_len; + encoded->unencoded_len = em->ram_bytes; + encoded->unencoded_offset = iocb->ki_pos - em->orig_start; + ret = btrfs_encoded_io_compression_from_extent( + em->compress_type); + if (ret < 0) + goto out_em; + encoded->compression = ret; + } else { + offset = em->block_start + (start - em->start); + if (encoded->len > count) + encoded->len = count; + /* + * Don't read beyond what we locked. This also limits the page + * allocations that we'll do. + */ + disk_io_size = min(lockend + 1, + iocb->ki_pos + encoded->len) - start; + encoded->len = encoded->unencoded_len = count = + start + disk_io_size - iocb->ki_pos; + disk_io_size = ALIGN(disk_io_size, fs_info->sectorsize); + } + free_extent_map(em); + em = NULL; + + if (offset == EXTENT_MAP_HOLE) { + unlock_extent_cached(io_tree, start, lockend, &cached_state); + inode_unlock_shared(inode); + unlocked = true; + ret = iov_iter_zero(count, iter); + if (ret != count) + ret = -EFAULT; + } else { + ret = btrfs_encoded_read_regular(iocb, iter, start, lockend, + &cached_state, offset, + disk_io_size, count, + encoded->compression, + &unlocked); + } + +out: + if (ret >= 0) + iocb->ki_pos += encoded->len; +out_em: + free_extent_map(em); +out_unlock_extent: + if (!unlocked) + unlock_extent_cached(io_tree, start, lockend, &cached_state); +out_unlock_inode: + if (!unlocked) + inode_unlock_shared(inode); + return ret; +} + #ifdef CONFIG_SWAP /* * Add an entry indicating a block group or device which is pinned by a diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index fecb8bac11dd..4e619a10f236 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -28,6 +28,7 @@ #include #include #include +#include #include "ctree.h" #include "disk-io.h" #include "export.h" @@ -87,6 +88,22 @@ struct btrfs_ioctl_send_args_32 { #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \ struct btrfs_ioctl_send_args_32) + +struct btrfs_ioctl_encoded_io_args_32 { + compat_uptr_t iov; + compat_ulong_t iovcnt; + __s64 offset; + __u64 flags; + __u64 len; + __u64 unencoded_len; + __u64 unencoded_offset; + __u32 compression; + __u32 encryption; + __u32 reserved[8]; +}; + +#define BTRFS_IOC_ENCODED_READ_32 _IOR(BTRFS_IOCTL_MAGIC, 64, \ + struct btrfs_ioctl_encoded_io_args_32) #endif /* Mask out flags that are inappropriate for the given type of inode. */ @@ -4824,6 +4841,94 @@ static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat) return ret; } +static int btrfs_ioctl_encoded_read(struct file *file, void __user *argp, + bool compat) +{ + struct btrfs_ioctl_encoded_io_args args; + size_t copy_end_kernel = offsetofend(struct btrfs_ioctl_encoded_io_args, + flags); + size_t copy_end; + struct iovec iovstack[UIO_FASTIOV]; + struct iovec *iov = iovstack; + struct iov_iter iter; + loff_t pos; + struct kiocb kiocb; + ssize_t ret; + + if (!capable(CAP_SYS_ADMIN)) { + ret = -EPERM; + goto out_acct; + } + + if (compat) { +#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) + struct btrfs_ioctl_encoded_io_args_32 args32; + + copy_end = offsetofend(struct btrfs_ioctl_encoded_io_args_32, + flags); + if (copy_from_user(&args32, argp, copy_end)) { + ret = -EFAULT; + goto out_acct; + } + args.iov = compat_ptr(args32.iov); + args.iovcnt = args32.iovcnt; + args.offset = args32.offset; + args.flags = args32.flags; +#else + return -ENOTTY; +#endif + } else { + copy_end = copy_end_kernel; + if (copy_from_user(&args, argp, copy_end)) { + ret = -EFAULT; + goto out_acct; + } + } + if (args.flags != 0) { + ret = -EINVAL; + goto out_acct; + } + memset((char *)&args + copy_end_kernel, 0, + sizeof(args) - copy_end_kernel); + + ret = import_iovec(READ, args.iov, args.iovcnt, ARRAY_SIZE(iovstack), + &iov, &iter); + if (ret < 0) + goto out_acct; + + if (iov_iter_count(&iter) == 0) { + ret = 0; + goto out_iov; + } + pos = args.offset; + ret = rw_verify_area(READ, file, &pos, args.len); + if (ret < 0) + goto out_iov; + + init_sync_kiocb(&kiocb, file); + ret = kiocb_set_rw_flags(&kiocb, 0); + if (ret) + goto out_iov; + kiocb.ki_pos = pos; + + ret = btrfs_encoded_read(&kiocb, &iter, &args); + if (ret >= 0) { + fsnotify_access(file); + if (copy_to_user(argp + copy_end, + (char *)&args + copy_end_kernel, + sizeof(args) - copy_end_kernel)) + ret = -EFAULT; + } + +out_iov: + kfree(iov); +out_acct: + if (ret > 0) + add_rchar(current, ret); + inc_syscr(current); + return ret; +} + long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -4968,6 +5073,12 @@ long btrfs_ioctl(struct file *file, unsigned int return fsverity_ioctl_enable(file, (const void __user *)argp); case FS_IOC_MEASURE_VERITY: return fsverity_ioctl_measure(file, argp); + case BTRFS_IOC_ENCODED_READ: + return btrfs_ioctl_encoded_read(file, argp, false); +#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT) + case BTRFS_IOC_ENCODED_READ_32: + return btrfs_ioctl_encoded_read(file, argp, true); +#endif } return -ENOTTY;