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io_uring/rsrc: refactor io_rsrc_node_switch

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We use io_rsrc_node_switch() coupled with io_rsrc_node_switch_start()
for a bunch of cases including initialising ctx->rsrc_node, i.e. by
passing NULL instead of rsrc_data. Leave it to only deal with actual
node changing.

For that, first remove it from io_uring_create() and add a function
allocating the first node. Then also remove all calls to
io_rsrc_node_switch() from files/buffers register as we already have a
node installed and it does essentially nothing.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d146fe306ff98b1a5a60c997c252534f03d423d7.1681210788.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2023-04-11 12:06:07 +01:00
committed by Jens Axboe
parent 13c223962e
commit 2933ae6eaa
3 changed files with 20 additions and 28 deletions
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5
io_uring/io_uring.c
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@@ -3881,11 +3881,10 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
ret = io_sq_offload_create(ctx, p);
if (ret)
goto err;
/* always set a rsrc node */
ret = io_rsrc_node_switch_start(ctx);
ret = io_rsrc_init(ctx);
if (ret)
goto err;
io_rsrc_node_switch(ctx, NULL);
memset(&p->sq_off, 0, sizeof(p->sq_off));
p->sq_off.head = offsetof(struct io_rings, sq.head);