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io_uring: add generic rsrc update with tags 

Add IORING_REGISTER_RSRC_UPDATE, which also supports passing in rsrc
tags. Implement it for registered files.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d4dc66df204212f64835ffca2c4eb5e8363f2f05.1619356238.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-04-25 14:32:22 +01:00 committed by Jens Axboe
parent 792e35824b
commit c3bdad0271
2 changed files with 57 additions and 17 deletions
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52
fs/io_uring.c
View File

@ -1036,7 +1036,7 @@ static void io_put_task(struct task_struct *task, int nr);
static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req);
static void io_queue_linked_timeout(struct io_kiocb *req);
static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
struct io_uring_rsrc_update *up,
struct io_uring_rsrc_update2 *up,
unsigned nr_args);
static void io_clean_op(struct io_kiocb *req);
static struct file *io_file_get(struct io_submit_state *state,
@ -5814,7 +5814,7 @@ static int io_rsrc_update_prep(struct io_kiocb *req,
static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ring_ctx *ctx = req->ctx;
struct io_uring_rsrc_update up;
struct io_uring_rsrc_update2 up;
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
@ -5822,6 +5822,8 @@ static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
up.offset = req->rsrc_update.offset;
up.data = req->rsrc_update.arg;
up.nr = 0;
up.tags = 0;
mutex_lock(&ctx->uring_lock);
ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE,
@ -7732,9 +7734,10 @@ static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
}
static int __io_sqe_files_update(struct io_ring_ctx *ctx,
struct io_uring_rsrc_update *up,
struct io_uring_rsrc_update2 *up,
unsigned nr_args)
{
u64 __user *tags = u64_to_user_ptr(up->tags);
__s32 __user *fds = u64_to_user_ptr(up->data);
struct io_rsrc_data *data = ctx->file_data;
struct io_fixed_file *file_slot;
@ -7749,10 +7752,17 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
return -EINVAL;
for (done = 0; done < nr_args; done++) {
if (copy_from_user(&fd, &fds[done], sizeof(fd))) {
u64 tag = 0;
if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) ||
copy_from_user(&fd, &fds[done], sizeof(fd))) {
err = -EFAULT;
break;
}
if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) {
err = -EINVAL;
break;
}
if (fd == IORING_REGISTER_FILES_SKIP)
continue;
@ -7787,6 +7797,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
err = -EBADF;
break;
}
data->tags[up->offset + done] = tag;
io_fixed_file_set(file_slot, file);
err = io_sqe_file_register(ctx, file, i);
if (err) {
@ -9718,12 +9729,14 @@ static int io_register_enable_rings(struct io_ring_ctx *ctx)
}
static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
struct io_uring_rsrc_update *up,
struct io_uring_rsrc_update2 *up,
unsigned nr_args)
{
__u32 tmp;
int err;
if (up->resv)
return -EINVAL;
if (check_add_overflow(up->offset, nr_args, &tmp))
return -EOVERFLOW;
err = io_rsrc_node_switch_start(ctx);
@ -9737,18 +9750,31 @@ static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
return -EINVAL;
}
static int io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
void __user *arg, unsigned nr_args)
static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
unsigned nr_args)
{
struct io_uring_rsrc_update up;
struct io_uring_rsrc_update2 up;
if (!nr_args)
return -EINVAL;
memset(&up, 0, sizeof(up));
if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update)))
return -EFAULT;
return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args);
}
static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
unsigned size)
{
struct io_uring_rsrc_update2 up;
if (size != sizeof(up))
return -EINVAL;
if (copy_from_user(&up, arg, sizeof(up)))
return -EFAULT;
if (up.resv)
if (!up.nr)
return -EINVAL;
return __io_register_rsrc_update(ctx, type, &up, nr_args);
return __io_register_rsrc_update(ctx, up.type, &up, up.nr);
}
static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
@ -9784,6 +9810,7 @@ static bool io_register_op_must_quiesce(int op)
case IORING_REGISTER_PERSONALITY:
case IORING_UNREGISTER_PERSONALITY:
case IORING_REGISTER_RSRC:
case IORING_REGISTER_RSRC_UPDATE:
return false;
default:
return true;
@ -9861,7 +9888,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
ret = io_sqe_files_unregister(ctx);
break;
case IORING_REGISTER_FILES_UPDATE:
ret = io_register_rsrc_update(ctx, IORING_RSRC_FILE, arg, nr_args);
ret = io_register_files_update(ctx, arg, nr_args);
break;
case IORING_REGISTER_EVENTFD:
case IORING_REGISTER_EVENTFD_ASYNC:
@ -9912,6 +9939,9 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
case IORING_REGISTER_RSRC:
ret = io_register_rsrc(ctx, arg, nr_args);
break;
case IORING_REGISTER_RSRC_UPDATE:
ret = io_register_rsrc_update(ctx, arg, nr_args);
break;
default:
ret = -EINVAL;
break;

22
include/uapi/linux/io_uring.h
View File

@ -299,6 +299,7 @@ enum {
IORING_REGISTER_RESTRICTIONS = 11,
IORING_REGISTER_ENABLE_RINGS = 12,
IORING_REGISTER_RSRC = 13,
IORING_REGISTER_RSRC_UPDATE = 14,
/* this goes last */
IORING_REGISTER_LAST
@ -311,12 +312,6 @@ struct io_uring_files_update {
__aligned_u64 /* __s32 * */ fds;
};
struct io_uring_rsrc_update {
__u32 offset;
__u32 resv;
__aligned_u64 data;
};
enum {
IORING_RSRC_FILE = 0,
};
@ -328,6 +323,21 @@ struct io_uring_rsrc_register {
__aligned_u64 tags;
};
struct io_uring_rsrc_update {
__u32 offset;
__u32 resv;
__aligned_u64 data;
};
struct io_uring_rsrc_update2 {
__u32 offset;
__u32 resv;
__aligned_u64 data;
__aligned_u64 tags;
__u32 type;
__u32 nr;
};
/* Skip updating fd indexes set to this value in the fd table */
#define IORING_REGISTER_FILES_SKIP (-2)