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io_uring: cleanup ->user usage

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At this point we're only using it for memory accounting, so there's no
need to have an extra ->limit_mem - we can just set ->user if we do
the accounting, or leave it at NULL if we don't.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-02-21 16:19:37 -07:00
parent 728f13e730
commit 62e398be27
1 changed files with 6 additions and 12 deletions
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18
fs/io_uring.c
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@ -334,7 +334,6 @@ struct io_ring_ctx {
struct {
unsigned int flags;
unsigned int compat: 1;
unsigned int limit_mem: 1;
unsigned int cq_overflow_flushed: 1;
unsigned int drain_next: 1;
unsigned int eventfd_async: 1;
@ -7230,7 +7229,7 @@ static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset)
skb->sk = sk;
nr_files = 0;
fpl->user = get_uid(ctx->user);
fpl->user = get_uid(current_user());
for (i = 0; i < nr; i++) {
struct file *file = io_file_from_index(ctx, i + offset);
@ -7942,7 +7941,7 @@ static inline int __io_account_mem(struct user_struct *user,
static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
{
if (ctx->limit_mem)
if (ctx->user)
__io_unaccount_mem(ctx->user, nr_pages);
if (ctx->mm_account)
@ -7953,7 +7952,7 @@ static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
{
int ret;
if (ctx->limit_mem) {
if (ctx->user) {
ret = __io_account_mem(ctx->user, nr_pages);
if (ret)
return ret;
@ -9370,7 +9369,6 @@ static struct file *io_uring_get_file(struct io_ring_ctx *ctx)
static int io_uring_create(unsigned entries, struct io_uring_params *p,
struct io_uring_params __user *params)
{
struct user_struct *user = NULL;
struct io_ring_ctx *ctx;
struct file *file;
int ret;
@ -9412,16 +9410,12 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p,
p->cq_entries = 2 * p->sq_entries;
}
user = get_uid(current_user());
ctx = io_ring_ctx_alloc(p);
if (!ctx) {
free_uid(user);
if (!ctx)
return -ENOMEM;
}
ctx->compat = in_compat_syscall();
ctx->limit_mem = !capable(CAP_IPC_LOCK);
ctx->user = user;
if (!capable(CAP_IPC_LOCK))
ctx->user = get_uid(current_user());
ctx->sqo_task = current;
/*