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io_uring: buffer registration infrastructure 

This just prepares the ring for having lists of buffers associated with
it, that the application can provide for SQEs to consume instead of
providing their own.

The buffers are organized by group ID.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-02-23 16:23:11 -07:00
parent e9fd939654
commit 5a2e745d4d
1 changed files with 35 additions and 0 deletions
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35
fs/io_uring.c
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@ -195,6 +195,13 @@ struct fixed_file_data {
struct completion done;
};
struct io_buffer {
struct list_head list;
__u64 addr;
__s32 len;
__u16 bid;
};
struct io_ring_ctx {
struct {
struct percpu_ref refs;
@ -272,6 +279,8 @@ struct io_ring_ctx {
struct socket *ring_sock;
#endif
struct idr io_buffer_idr;
struct idr personality_idr;
struct {
@ -875,6 +884,7 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
INIT_LIST_HEAD(&ctx->cq_overflow_list);
init_completion(&ctx->completions[0]);
init_completion(&ctx->completions[1]);
idr_init(&ctx->io_buffer_idr);
idr_init(&ctx->personality_idr);
mutex_init(&ctx->uring_lock);
init_waitqueue_head(&ctx->wait);
@ -6524,6 +6534,30 @@ static int io_eventfd_unregister(struct io_ring_ctx *ctx)
return -ENXIO;
}
static int __io_destroy_buffers(int id, void *p, void *data)
{
struct io_ring_ctx *ctx = data;
struct io_buffer *buf = p;
/* the head kbuf is the list itself */
while (!list_empty(&buf->list)) {
struct io_buffer *nxt;
nxt = list_first_entry(&buf->list, struct io_buffer, list);
list_del(&nxt->list);
kfree(nxt);
}
kfree(buf);
idr_remove(&ctx->io_buffer_idr, id);
return 0;
}
static void io_destroy_buffers(struct io_ring_ctx *ctx)
{
idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx);
idr_destroy(&ctx->io_buffer_idr);
}
static void io_ring_ctx_free(struct io_ring_ctx *ctx)
{
io_finish_async(ctx);
@ -6534,6 +6568,7 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
io_sqe_buffer_unregister(ctx);
io_sqe_files_unregister(ctx);
io_eventfd_unregister(ctx);
io_destroy_buffers(ctx);
idr_destroy(&ctx->personality_idr);
#if defined(CONFIG_UNIX)