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Mon, 15 Jul 2024 11:45:37 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pankajraghav.com; s=MBO0001; t=1721036737; 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=92ifPOSk+9xMdQXjuWHjR+cARiQXMVhXQNki2unPXuQ=; b=rGrj22+ZbxWopDnVHtQ4n9SYXpTi+VrSPG6duV70k1Xw2paVhATH4a7VmK4dscc7zY2/O8 5Q6+F+TWSQLltJzk/L+FGzXTWshUUN/d9QbtsLNtI6cGDPpWtIgmAZ9Xpzn6bScg+/6uyq XBXN+0gRAgYZWIRK8XAea5BBejOKEW70Zv7AOmMxoumemPvAQ/xsg1ZBLJZ46UW0T0Wobu gE3zexFXWrJvj7mxOaBV7uW4nNkLR6Wn7VH6tPr0CVQwn5rpQtQzioTJoAacDBJ9eKIgir j32814slkkg3dakyF4d8QIYZgV/Ib2z08IT6D3c2xbqUxPqr2qaAHHI2ewlHBQ== From: "Pankaj Raghav (Samsung)" To: david@fromorbit.com, willy@infradead.org, chandan.babu@oracle.com, djwong@kernel.org, brauner@kernel.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, yang@os.amperecomputing.com, linux-mm@kvack.org, john.g.garry@oracle.com, linux-fsdevel@vger.kernel.org, hare@suse.de, p.raghav@samsung.com, mcgrof@kernel.org, gost.dev@samsung.com, cl@os.amperecomputing.com, linux-xfs@vger.kernel.org, kernel@pankajraghav.com, ryan.roberts@arm.com, hch@lst.de, Zi Yan , Dave Chinner Subject: [PATCH v10 06/10] iomap: fix iomap_dio_zero() for fs bs > system page size Date: Mon, 15 Jul 2024 11:44:53 +0200 Message-ID: <20240715094457.452836-7-kernel@pankajraghav.com> In-Reply-To: <20240715094457.452836-1-kernel@pankajraghav.com> References: <20240715094457.452836-1-kernel@pankajraghav.com> MIME-Version: 1.0 X-Stat-Signature: ozt7kopjsy3zeks8sxa79ogeotqb8joj X-Rspam-User: X-Rspamd-Queue-Id: 223191C001B X-Rspamd-Server: rspam02 X-HE-Tag: 1721036739-885544 X-HE-Meta: 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 ypmwU+vZ 4xFZvze1nDq2BeZ65OpP71umOSnIgdUHQkiNrOzdJrE4aHbWWflzn0q+Hhnw6RBa4I22aUaAu7caEPZ31aLlscju4BxD73FYm1YtBEodWf+P7aBlGYrHCHPYqeK73NupmcSaRLeEmKYKjKBpUGoeSYLBW6CHJSg/FlddXvKdY6B0BEmXL8n5lDEnF45V9+ZVsFEtXvEEXZWCns/NeW/1GTTbm1PNaeMqKQ7M96d64oRjaJL14aR4mkBkE/JVPlM4UFnzeMEQ0VrWr5qgTi0MXHVp3rbCG4L+0fvYIZey898cK+4r6JSneDoZ99Pxy69lqWmOEcsQ8fRLroaPDmdWApTYMNkYBylLwzlFbwiloJ0yURsqObwi7VT8Kdvv8yWhdQ2HcK3IlDsjdNzU= 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: List-Subscribe: List-Unsubscribe: From: Pankaj Raghav iomap_dio_zero() will pad a fs block with zeroes if the direct IO size < fs block size. iomap_dio_zero() has an implicit assumption that fs block size < page_size. This is true for most filesystems at the moment. If the block size > page size, this will send the contents of the page next to zero page(as len > PAGE_SIZE) to the underlying block device, causing FS corruption. iomap is a generic infrastructure and it should not make any assumptions about the fs block size and the page size of the system. Signed-off-by: Pankaj Raghav Reviewed-by: Hannes Reinecke Reviewed-by: Darrick J. Wong Reviewed-by: Dave Chinner --- fs/iomap/buffered-io.c | 4 ++-- fs/iomap/direct-io.c | 45 ++++++++++++++++++++++++++++++++++++------ 2 files changed, 41 insertions(+), 8 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index f420c53d86acc..d745f718bcde8 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -2007,10 +2007,10 @@ iomap_writepages(struct address_space *mapping, struct writeback_control *wbc, } EXPORT_SYMBOL_GPL(iomap_writepages); -static int __init iomap_init(void) +static int __init iomap_buffered_init(void) { return bioset_init(&iomap_ioend_bioset, 4 * (PAGE_SIZE / SECTOR_SIZE), offsetof(struct iomap_ioend, io_bio), BIOSET_NEED_BVECS); } -fs_initcall(iomap_init); +fs_initcall(iomap_buffered_init); diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index f3b43d223a46e..c02b266bba525 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include "trace.h" @@ -27,6 +28,13 @@ #define IOMAP_DIO_WRITE (1U << 30) #define IOMAP_DIO_DIRTY (1U << 31) +/* + * Used for sub block zeroing in iomap_dio_zero() + */ +#define IOMAP_ZERO_PAGE_SIZE (SZ_64K) +#define IOMAP_ZERO_PAGE_ORDER (get_order(IOMAP_ZERO_PAGE_SIZE)) +static struct page *zero_page; + struct iomap_dio { struct kiocb *iocb; const struct iomap_dio_ops *dops; @@ -232,13 +240,20 @@ void iomap_dio_bio_end_io(struct bio *bio) } EXPORT_SYMBOL_GPL(iomap_dio_bio_end_io); -static void iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio, +static int iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio, loff_t pos, unsigned len) { struct inode *inode = file_inode(dio->iocb->ki_filp); - struct page *page = ZERO_PAGE(0); struct bio *bio; + if (!len) + return 0; + /* + * Max block size supported is 64k + */ + if (WARN_ON_ONCE(len > IOMAP_ZERO_PAGE_SIZE)) + return -EINVAL; + bio = iomap_dio_alloc_bio(iter, dio, 1, REQ_OP_WRITE | REQ_SYNC | REQ_IDLE); fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits, GFP_KERNEL); @@ -246,8 +261,9 @@ static void iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio, bio->bi_private = dio; bio->bi_end_io = iomap_dio_bio_end_io; - __bio_add_page(bio, page, len, 0); + __bio_add_page(bio, zero_page, len, 0); iomap_dio_submit_bio(iter, dio, bio, pos); + return 0; } /* @@ -356,8 +372,10 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, if (need_zeroout) { /* zero out from the start of the block to the write offset */ pad = pos & (fs_block_size - 1); - if (pad) - iomap_dio_zero(iter, dio, pos - pad, pad); + + ret = iomap_dio_zero(iter, dio, pos - pad, pad); + if (ret) + goto out; } /* @@ -431,7 +449,8 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, /* zero out from the end of the write to the end of the block */ pad = pos & (fs_block_size - 1); if (pad) - iomap_dio_zero(iter, dio, pos, fs_block_size - pad); + ret = iomap_dio_zero(iter, dio, pos, + fs_block_size - pad); } out: /* Undo iter limitation to current extent */ @@ -753,3 +772,17 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, return iomap_dio_complete(dio); } EXPORT_SYMBOL_GPL(iomap_dio_rw); + +static int __init iomap_dio_init(void) +{ + zero_page = alloc_pages(GFP_KERNEL | __GFP_ZERO, + IOMAP_ZERO_PAGE_ORDER); + + if (!zero_page) + return -ENOMEM; + + set_memory_ro((unsigned long)page_address(zero_page), + 1U << IOMAP_ZERO_PAGE_ORDER); + return 0; +} +fs_initcall(iomap_dio_init);