| From | Jens Axboe <> | Subject | [PATCH 003/437] fs: add helpers for defining read/write iterator helpers | Date | Thu, 11 Apr 2024 09:12:23 -0600 |
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To ease conversion for drivers, add helpers that allow a driver to simply wrap their existing read/write file_operations hook and turn it into one that is appropriate for ->read_iter() or ->write_iter().
Signed-off-by: Jens Axboe <axboe@kernel.dk> --- include/linux/fs.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/include/linux/fs.h b/include/linux/fs.h index fd862985a309..72de0b1d5647 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2141,6 +2141,22 @@ extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos, struct file *dst_file, loff_t dst_pos, loff_t len, unsigned int remap_flags); +/* + * Drivers can use these to ease transition to using ->read_iter() instead + * of ->read(), and ->write_iter() instead of ->write(). Ideally these will + * go away one day. + */ +#define FOPS_READ_ITER_HELPER(name) \ +static ssize_t name## _iter(struct kiocb *iocb, struct iov_iter *to) \ +{ \ + return vfs_read_iter(iocb, to, name); \ +} +#define FOPS_WRITE_ITER_HELPER(name) \ +static ssize_t name## _iter(struct kiocb *iocb, struct iov_iter *from) \ +{ \ + return vfs_write_iter(iocb, from, name); \ +} + /** * enum freeze_holder - holder of the freeze * @FREEZE_HOLDER_KERNEL: kernel wants to freeze or thaw filesystem -- 2.43.0
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