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0b10a37052
Add support for generating / verifying protection information in iomap. This is done by hooking into the bio submission and then using the generic PI helpers. Compared to just using the block layer auto PI this extends the protection envelope and also prepares for eventually passing through PI from userspace at least for direct I/O. To generate or verify PI, the file system needs to set the IOMAP_F_INTEGRITY flag on the iomap for the request, and ensure the ioends are used for all integrity I/O. Additionally the file system must defer read I/O completions to user context so that the guard tag validation isn't run from interrupt context. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://patch.msgid.link/20260223132021.292832-16-hch@lst.de Tested-by: Anuj Gupta <anuj20.g@samsung.com> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
36 lines
1018 B
C
36 lines
1018 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _IOMAP_INTERNAL_H
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#define _IOMAP_INTERNAL_H 1
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#define IOEND_BATCH_SIZE 4096
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/*
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* Normally we can build bios as big as the data structure supports.
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*
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* But for integrity protected I/O we need to respect the maximum size of the
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* single contiguous allocation for the integrity buffer.
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*/
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static inline size_t iomap_max_bio_size(const struct iomap *iomap)
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{
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if (iomap->flags & IOMAP_F_INTEGRITY)
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return max_integrity_io_size(bdev_limits(iomap->bdev));
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return BIO_MAX_SIZE;
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}
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u32 iomap_finish_ioend_buffered_read(struct iomap_ioend *ioend);
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u32 iomap_finish_ioend_direct(struct iomap_ioend *ioend);
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#ifdef CONFIG_BLOCK
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int iomap_bio_read_folio_range_sync(const struct iomap_iter *iter,
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struct folio *folio, loff_t pos, size_t len);
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#else
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static inline int iomap_bio_read_folio_range_sync(const struct iomap_iter *iter,
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struct folio *folio, loff_t pos, size_t len)
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{
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WARN_ON_ONCE(1);
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return -EIO;
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}
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#endif /* CONFIG_BLOCK */
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#endif /* _IOMAP_INTERNAL_H */
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