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fs: add vfs_iter_{read,write} helpers

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Simple helpers that pass an arbitrary iov_iter to filesystems.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2015-01-25 21:11:59 +01:00
committed by Al Viro
parent 05afcb77eb
commit dbe4e192a2
3 changed files with 51 additions and 14 deletions
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16
fs/splice.c
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@@ -961,7 +961,6 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
splice_from_pipe_begin(&sd);
while (sd.total_len) {
struct iov_iter from;
struct kiocb kiocb;
size_t left;
int n, idx;
@@ -1005,26 +1004,15 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
left -= this_len;
}
/* ... iov_iter */
iov_iter_bvec(&from, ITER_BVEC | WRITE, array, n,
sd.total_len - left);
/* ... and iocb */
init_sync_kiocb(&kiocb, out);
kiocb.ki_pos = sd.pos;
kiocb.ki_nbytes = sd.total_len - left;
/* now, send it */
ret = out->f_op->write_iter(&kiocb, &from);
if (-EIOCBQUEUED == ret)
ret = wait_on_sync_kiocb(&kiocb);
ret = vfs_iter_write(out, &from, &sd.pos);
if (ret <= 0)
break;
sd.num_spliced += ret;
sd.total_len -= ret;
*ppos = sd.pos = kiocb.ki_pos;
*ppos = sd.pos;
/* dismiss the fully eaten buffers, adjust the partial one */
while (ret) {