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From a6294593e8a1290091d0b078d5d33da5e0cd3dfe Mon Sep 17 00:00:00 2001
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From: Andreas Gruenbacher <agruenba@redhat.com>
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Date: Mon, 2 Aug 2021 14:54:16 +0200
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Subject: [Backport a6294593e8a1] iov_iter: Turn iov_iter_fault_in_readable
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into fault_in_iov_iter_readable
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Turn iov_iter_fault_in_readable into a function that returns the number
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of bytes not faulted in, similar to copy_to_user, instead of returning a
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non-zero value when any of the requested pages couldn't be faulted in.
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This supports the existing users that require all pages to be faulted in
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as well as new users that are happy if any pages can be faulted in.
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Rename iov_iter_fault_in_readable to fault_in_iov_iter_readable to make
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sure this change doesn't silently break things.
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Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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---
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src/file.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/file.c b/src/file.c
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index 424450e77ad52ae550e8de444dc393411d97cde6..a52388387175ac6ed8bfa31ee1af0c78455582be 100644
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--- a/src/file.c
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+++ b/src/file.c
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@@ -987,7 +987,7 @@ static ssize_t ntfs_compress_write(struct kiocb *iocb, struct iov_iter *from)
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frame_vbo = pos & ~(frame_size - 1);
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index = frame_vbo >> PAGE_SHIFT;
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- if (unlikely(iov_iter_fault_in_readable(from, bytes))) {
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+ if (unlikely(fault_in_iov_iter_readable(from, bytes))) {
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err = -EFAULT;
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goto out;
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}
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--
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2.31.1
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