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| author | David Howells <dhowells@redhat.com> | 2018-10-20 02:57:56 +0300 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2018-10-24 02:41:07 +0300 |
| commit | aa563d7bca6e882ec2bdae24603c8f016401a144 (patch) | |
| tree | 874b10fc11da3178e4630f7a430e1b299d3b3806 /fs/splice.c | |
| parent | 00e23707442a75b404392cef1405ab4fd498de6b (diff) | |
| download | linux-aa563d7bca6e882ec2bdae24603c8f016401a144.tar.xz | |
iov_iter: Separate type from direction and use accessor functions
In the iov_iter struct, separate the iterator type from the iterator
direction and use accessor functions to access them in most places.
Convert a bunch of places to use switch-statements to access them rather
then chains of bitwise-AND statements. This makes it easier to add further
iterator types. Also, this can be more efficient as to implement a switch
of small contiguous integers, the compiler can use ~50% fewer compare
instructions than it has to use bitwise-and instructions.
Further, cease passing the iterator type into the iterator setup function.
The iterator function can set that itself. Only the direction is required.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/splice.c')
| -rw-r--r-- | fs/splice.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/splice.c b/fs/splice.c index b3daa971f597..3553f1956508 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -301,7 +301,7 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos, struct kiocb kiocb; int idx, ret; - iov_iter_pipe(&to, ITER_PIPE | READ, pipe, len); + iov_iter_pipe(&to, READ, pipe, len); idx = to.idx; init_sync_kiocb(&kiocb, in); kiocb.ki_pos = *ppos; @@ -386,7 +386,7 @@ static ssize_t default_file_splice_read(struct file *in, loff_t *ppos, */ offset = *ppos & ~PAGE_MASK; - iov_iter_pipe(&to, ITER_PIPE | READ, pipe, len + offset); + iov_iter_pipe(&to, READ, pipe, len + offset); res = iov_iter_get_pages_alloc(&to, &pages, len + offset, &base); if (res <= 0) @@ -745,8 +745,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out, left -= this_len; } - iov_iter_bvec(&from, ITER_BVEC | WRITE, array, n, - sd.total_len - left); + iov_iter_bvec(&from, WRITE, array, n, sd.total_len - left); ret = vfs_iter_write(out, &from, &sd.pos, 0); if (ret <= 0) break; |