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hugetlbfs: copy_page_to_iter() can deal with compound pages 

... since April 2021

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2022-06-23 17:24:09 -04:00
parent f0f6b614f8
commit c7d57ab163
1 changed files with 1 additions and 30 deletions
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31
fs/hugetlbfs/inode.c
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@ -284,35 +284,6 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
}
#endif
static size_t
hugetlbfs_read_actor(struct page *page, unsigned long offset,
struct iov_iter *to, unsigned long size)
{
size_t copied = 0;
int i, chunksize;
/* Find which 4k chunk and offset with in that chunk */
i = offset >> PAGE_SHIFT;
offset = offset & ~PAGE_MASK;
while (size) {
size_t n;
chunksize = PAGE_SIZE;
if (offset)
chunksize -= offset;
if (chunksize > size)
chunksize = size;
n = copy_page_to_iter(&page[i], offset, chunksize, to);
copied += n;
if (n != chunksize)
return copied;
offset = 0;
size -= chunksize;
i++;
}
return copied;
}
/*
* Support for read() - Find the page attached to f_mapping and copy out the
* data. Its *very* similar to generic_file_buffered_read(), we can't use that
@ -363,7 +334,7 @@ static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to)
/*
* We have the page, copy it to user space buffer.
*/
copied = hugetlbfs_read_actor(page, offset, to, nr);
copied = copy_page_to_iter(page, offset, nr, to);
put_page(page);
}
offset += copied;