linux-IllusionX/io_uring/fdinfo.c
Jens Axboe 1da2f311ba io_uring: fix warnings on shadow variables
There are a few of those:

io_uring/fdinfo.c:170:16: warning: declaration shadows a local variable [-Wshadow]
  170 |                 struct file *f = io_file_from_index(&ctx->file_table, i);
      |                              ^
io_uring/fdinfo.c:53:67: note: previous declaration is here
   53 | __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
      |                                                                   ^
io_uring/cancel.c:187:25: warning: declaration shadows a local variable [-Wshadow]
  187 |                 struct io_uring_task *tctx = node->task->io_uring;
      |                                       ^
io_uring/cancel.c:166:31: note: previous declaration is here
  166 |                              struct io_uring_task *tctx,
      |                                                    ^
io_uring/register.c:371:25: warning: declaration shadows a local variable [-Wshadow]
  371 |                 struct io_uring_task *tctx = node->task->io_uring;
      |                                       ^
io_uring/register.c:312:24: note: previous declaration is here
  312 |         struct io_uring_task *tctx = NULL;
      |                               ^

and a simple cleanup gets rid of them. For the fdinfo case, make a
distinction between the file being passed in (for the ring), and the
registered files we iterate. For the other two cases, just get rid of
shadowed variable, there's no reason to have a new one.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2024-04-15 08:10:26 -06:00

227 lines
7.1 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/io_uring.h>
#include <uapi/linux/io_uring.h>
#include "io_uring.h"
#include "sqpoll.h"
#include "fdinfo.h"
#include "cancel.h"
#include "rsrc.h"
#ifdef CONFIG_PROC_FS
static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id,
const struct cred *cred)
{
struct user_namespace *uns = seq_user_ns(m);
struct group_info *gi;
kernel_cap_t cap;
int g;
seq_printf(m, "%5d\n", id);
seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid));
seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid));
seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid));
seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid));
seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid));
seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid));
seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid));
seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid));
seq_puts(m, "\n\tGroups:\t");
gi = cred->group_info;
for (g = 0; g < gi->ngroups; g++) {
seq_put_decimal_ull(m, g ? " " : "",
from_kgid_munged(uns, gi->gid[g]));
}
seq_puts(m, "\n\tCapEff:\t");
cap = cred->cap_effective;
seq_put_hex_ll(m, NULL, cap.val, 16);
seq_putc(m, '\n');
return 0;
}
/*
* Caller holds a reference to the file already, we don't need to do
* anything else to get an extra reference.
*/
__cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file)
{
struct io_ring_ctx *ctx = file->private_data;
struct io_overflow_cqe *ocqe;
struct io_rings *r = ctx->rings;
struct rusage sq_usage;
unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1;
unsigned int sq_head = READ_ONCE(r->sq.head);
unsigned int sq_tail = READ_ONCE(r->sq.tail);
unsigned int cq_head = READ_ONCE(r->cq.head);
unsigned int cq_tail = READ_ONCE(r->cq.tail);
unsigned int cq_shift = 0;
unsigned int sq_shift = 0;
unsigned int sq_entries, cq_entries;
int sq_pid = -1, sq_cpu = -1;
u64 sq_total_time = 0, sq_work_time = 0;
bool has_lock;
unsigned int i;
if (ctx->flags & IORING_SETUP_CQE32)
cq_shift = 1;
if (ctx->flags & IORING_SETUP_SQE128)
sq_shift = 1;
/*
* we may get imprecise sqe and cqe info if uring is actively running
* since we get cached_sq_head and cached_cq_tail without uring_lock
* and sq_tail and cq_head are changed by userspace. But it's ok since
* we usually use these info when it is stuck.
*/
seq_printf(m, "SqMask:\t0x%x\n", sq_mask);
seq_printf(m, "SqHead:\t%u\n", sq_head);
seq_printf(m, "SqTail:\t%u\n", sq_tail);
seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head);
seq_printf(m, "CqMask:\t0x%x\n", cq_mask);
seq_printf(m, "CqHead:\t%u\n", cq_head);
seq_printf(m, "CqTail:\t%u\n", cq_tail);
seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail);
seq_printf(m, "SQEs:\t%u\n", sq_tail - sq_head);
sq_entries = min(sq_tail - sq_head, ctx->sq_entries);
for (i = 0; i < sq_entries; i++) {
unsigned int entry = i + sq_head;
struct io_uring_sqe *sqe;
unsigned int sq_idx;
if (ctx->flags & IORING_SETUP_NO_SQARRAY)
break;
sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
if (sq_idx > sq_mask)
continue;
sqe = &ctx->sq_sqes[sq_idx << sq_shift];
seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, "
"addr:0x%llx, rw_flags:0x%x, buf_index:%d "
"user_data:%llu",
sq_idx, io_uring_get_opcode(sqe->opcode), sqe->fd,
sqe->flags, (unsigned long long) sqe->off,
(unsigned long long) sqe->addr, sqe->rw_flags,
sqe->buf_index, sqe->user_data);
if (sq_shift) {
u64 *sqeb = (void *) (sqe + 1);
int size = sizeof(struct io_uring_sqe) / sizeof(u64);
int j;
for (j = 0; j < size; j++) {
seq_printf(m, ", e%d:0x%llx", j,
(unsigned long long) *sqeb);
sqeb++;
}
}
seq_printf(m, "\n");
}
seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head);
cq_entries = min(cq_tail - cq_head, ctx->cq_entries);
for (i = 0; i < cq_entries; i++) {
unsigned int entry = i + cq_head;
struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift];
seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x",
entry & cq_mask, cqe->user_data, cqe->res,
cqe->flags);
if (cq_shift)
seq_printf(m, ", extra1:%llu, extra2:%llu\n",
cqe->big_cqe[0], cqe->big_cqe[1]);
seq_printf(m, "\n");
}
/*
* Avoid ABBA deadlock between the seq lock and the io_uring mutex,
* since fdinfo case grabs it in the opposite direction of normal use
* cases. If we fail to get the lock, we just don't iterate any
* structures that could be going away outside the io_uring mutex.
*/
has_lock = mutex_trylock(&ctx->uring_lock);
if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) {
struct io_sq_data *sq = ctx->sq_data;
/*
* sq->thread might be NULL if we raced with the sqpoll
* thread termination.
*/
if (sq->thread) {
sq_pid = sq->task_pid;
sq_cpu = sq->sq_cpu;
getrusage(sq->thread, RUSAGE_SELF, &sq_usage);
sq_total_time = (sq_usage.ru_stime.tv_sec * 1000000
+ sq_usage.ru_stime.tv_usec);
sq_work_time = sq->work_time;
}
}
seq_printf(m, "SqThread:\t%d\n", sq_pid);
seq_printf(m, "SqThreadCpu:\t%d\n", sq_cpu);
seq_printf(m, "SqTotalTime:\t%llu\n", sq_total_time);
seq_printf(m, "SqWorkTime:\t%llu\n", sq_work_time);
seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
struct file *f = io_file_from_index(&ctx->file_table, i);
if (f)
seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
else
seq_printf(m, "%5u: <none>\n", i);
}
seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
struct io_mapped_ubuf *buf = ctx->user_bufs[i];
unsigned int len = buf->ubuf_end - buf->ubuf;
seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len);
}
if (has_lock && !xa_empty(&ctx->personalities)) {
unsigned long index;
const struct cred *cred;
seq_printf(m, "Personalities:\n");
xa_for_each(&ctx->personalities, index, cred)
io_uring_show_cred(m, index, cred);
}
seq_puts(m, "PollList:\n");
for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) {
struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i];
struct io_hash_bucket *hbl = &ctx->cancel_table_locked.hbs[i];
struct io_kiocb *req;
spin_lock(&hb->lock);
hlist_for_each_entry(req, &hb->list, hash_node)
seq_printf(m, " op=%d, task_works=%d\n", req->opcode,
task_work_pending(req->task));
spin_unlock(&hb->lock);
if (!has_lock)
continue;
hlist_for_each_entry(req, &hbl->list, hash_node)
seq_printf(m, " op=%d, task_works=%d\n", req->opcode,
task_work_pending(req->task));
}
if (has_lock)
mutex_unlock(&ctx->uring_lock);
seq_puts(m, "CqOverflowList:\n");
spin_lock(&ctx->completion_lock);
list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) {
struct io_uring_cqe *cqe = &ocqe->cqe;
seq_printf(m, " user_data=%llu, res=%d, flags=%x\n",
cqe->user_data, cqe->res, cqe->flags);
}
spin_unlock(&ctx->completion_lock);
}
#endif