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new methods: ->read_iter() and ->write_iter()

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Beginning to introduce those.  Just the callers for now, and it's
clumsier than it'll eventually become; once we finish converting
aio_read and aio_write instances, the things will get nicer.

For now, these guys are in parallel to ->aio_read() and ->aio_write();
they take iocb and iov_iter, with everything in iov_iter already
validated.  File offset is passed in iocb->ki_pos, iov/nr_segs -
in iov_iter.

Main concerns in that series are stack footprint and ability to
split the damn thing cleanly.

[fix from Peter Ujfalusi <[email protected]> folded]

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2014-02-11 18:37:41 -05:00
commit 293bc9822f
7 changed files with 121 additions and 13 deletions
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14
fs/aio.c
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@ -1241,6 +1241,7 @@ SYSCALL_DEFINE1(io_destroy, aio_context_t, ctx)
typedef ssize_t (aio_rw_op)(struct kiocb *, const struct iovec *,
unsigned long, loff_t);
typedef ssize_t (rw_iter_op)(struct kiocb *, struct iov_iter *);
static ssize_t aio_setup_vectored_rw(struct kiocb *kiocb,
int rw, char __user *buf,
@ -1298,7 +1299,9 @@ static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
int rw;
fmode_t mode;
aio_rw_op *rw_op;
rw_iter_op *iter_op;
struct iovec inline_vec, *iovec = &inline_vec;
struct iov_iter iter;
switch (opcode) {
case IOCB_CMD_PREAD:
@ -1306,6 +1309,7 @@ static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
mode = FMODE_READ;
rw = READ;
rw_op = file->f_op->aio_read;
iter_op = file->f_op->read_iter;
goto rw_common;
case IOCB_CMD_PWRITE:
@ -1313,12 +1317,13 @@ static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
mode = FMODE_WRITE;
rw = WRITE;
rw_op = file->f_op->aio_write;
iter_op = file->f_op->write_iter;
goto rw_common;
rw_common:
if (unlikely(!(file->f_mode & mode)))
return -EBADF;
if (!rw_op)
if (!rw_op && !iter_op)
return -EINVAL;
ret = (opcode == IOCB_CMD_PREADV ||
@ -1347,7 +1352,12 @@ rw_common:
if (rw == WRITE)
file_start_write(file);
ret = rw_op(req, iovec, nr_segs, req->ki_pos);
if (iter_op) {
iov_iter_init(&iter, rw, iovec, nr_segs, req->ki_nbytes);
ret = iter_op(req, &iter);
} else {
ret = rw_op(req, iovec, nr_segs, req->ki_pos);
}
if (rw == WRITE)
file_end_write(file);