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authorDavid Howells <dhowells@redhat.com>2023-05-22 21:57:44 +0100
committerJens Axboe <axboe@kernel.dk>2023-05-24 08:42:44 -0600
commit403b6fb8dac1e9407c04652cedd92285c5ae9aa5 (patch)
tree42ba9e7528e304cc6f82045d386910f063a27a9b /block/partitions
parenta7e689dd1c06e0cbd6d216a6868e33099d8fc8d8 (diff)
block: convert bio_map_user_iov to use iov_iter_extract_pages
This will pin pages or leave them unaltered rather than getting a ref on them as appropriate to the iterator. The pages need to be pinned for DIO rather than having refs taken on them to prevent VM copy-on-write from malfunctioning during a concurrent fork() (the result of the I/O could otherwise end up being visible to/affected by the child process). Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: John Hubbard <jhubbard@nvidia.com> cc: Al Viro <viro@zeniv.linux.org.uk> cc: Jens Axboe <axboe@kernel.dk> cc: Jan Kara <jack@suse.cz> cc: Matthew Wilcox <willy@infradead.org> cc: Logan Gunthorpe <logang@deltatee.com> cc: linux-block@vger.kernel.org Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20230522205744.2825689-7-dhowells@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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