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https://github.com/torvalds/linux
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io_uring: move fdinfo helpers to its own file
This also means moving a bit more of the fixed file handling to the filetable side, which makes sense separately too. Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
parent
e5550a1447
commit
a4ad4f748e
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@ -6,5 +6,5 @@ obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o \
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sync.o advise.o filetable.o \
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openclose.o uring_cmd.o epoll.o \
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statx.o net.o msg_ring.o timeout.o \
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sqpoll.o
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sqpoll.o fdinfo.o
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obj-$(CONFIG_IO_WQ) += io-wq.o
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191
io_uring/fdinfo.c
Normal file
191
io_uring/fdinfo.c
Normal file
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@ -0,0 +1,191 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/io_uring.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring_types.h"
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#include "io_uring.h"
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#include "sqpoll.h"
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#include "fdinfo.h"
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#ifdef CONFIG_PROC_FS
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static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id,
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const struct cred *cred)
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{
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struct user_namespace *uns = seq_user_ns(m);
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struct group_info *gi;
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kernel_cap_t cap;
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unsigned __capi;
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int g;
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seq_printf(m, "%5d\n", id);
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seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid));
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seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid));
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seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid));
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seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid));
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seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid));
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seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid));
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seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid));
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seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid));
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seq_puts(m, "\n\tGroups:\t");
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gi = cred->group_info;
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for (g = 0; g < gi->ngroups; g++) {
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seq_put_decimal_ull(m, g ? " " : "",
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from_kgid_munged(uns, gi->gid[g]));
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}
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seq_puts(m, "\n\tCapEff:\t");
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cap = cred->cap_effective;
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CAP_FOR_EACH_U32(__capi)
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seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8);
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seq_putc(m, '\n');
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return 0;
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}
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static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
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struct seq_file *m)
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{
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struct io_sq_data *sq = NULL;
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struct io_overflow_cqe *ocqe;
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struct io_rings *r = ctx->rings;
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unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1;
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unsigned int sq_head = READ_ONCE(r->sq.head);
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unsigned int sq_tail = READ_ONCE(r->sq.tail);
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unsigned int cq_head = READ_ONCE(r->cq.head);
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unsigned int cq_tail = READ_ONCE(r->cq.tail);
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unsigned int cq_shift = 0;
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unsigned int sq_entries, cq_entries;
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bool has_lock;
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bool is_cqe32 = (ctx->flags & IORING_SETUP_CQE32);
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unsigned int i;
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if (is_cqe32)
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cq_shift = 1;
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/*
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* we may get imprecise sqe and cqe info if uring is actively running
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* since we get cached_sq_head and cached_cq_tail without uring_lock
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* and sq_tail and cq_head are changed by userspace. But it's ok since
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* we usually use these info when it is stuck.
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*/
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seq_printf(m, "SqMask:\t0x%x\n", sq_mask);
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seq_printf(m, "SqHead:\t%u\n", sq_head);
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seq_printf(m, "SqTail:\t%u\n", sq_tail);
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seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head);
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seq_printf(m, "CqMask:\t0x%x\n", cq_mask);
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seq_printf(m, "CqHead:\t%u\n", cq_head);
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seq_printf(m, "CqTail:\t%u\n", cq_tail);
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seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail);
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seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head);
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sq_entries = min(sq_tail - sq_head, ctx->sq_entries);
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for (i = 0; i < sq_entries; i++) {
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unsigned int entry = i + sq_head;
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unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
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struct io_uring_sqe *sqe;
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if (sq_idx > sq_mask)
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continue;
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sqe = &ctx->sq_sqes[sq_idx];
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seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n",
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sq_idx, sqe->opcode, sqe->fd, sqe->flags,
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sqe->user_data);
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}
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seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head);
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cq_entries = min(cq_tail - cq_head, ctx->cq_entries);
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for (i = 0; i < cq_entries; i++) {
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unsigned int entry = i + cq_head;
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struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift];
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if (!is_cqe32) {
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seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n",
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entry & cq_mask, cqe->user_data, cqe->res,
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cqe->flags);
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} else {
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seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x, "
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"extra1:%llu, extra2:%llu\n",
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entry & cq_mask, cqe->user_data, cqe->res,
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cqe->flags, cqe->big_cqe[0], cqe->big_cqe[1]);
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}
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}
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/*
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* Avoid ABBA deadlock between the seq lock and the io_uring mutex,
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* since fdinfo case grabs it in the opposite direction of normal use
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* cases. If we fail to get the lock, we just don't iterate any
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* structures that could be going away outside the io_uring mutex.
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*/
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has_lock = mutex_trylock(&ctx->uring_lock);
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if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) {
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sq = ctx->sq_data;
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if (!sq->thread)
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sq = NULL;
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}
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seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1);
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seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1);
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seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
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for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
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struct file *f = io_file_from_index(&ctx->file_table, i);
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if (f)
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seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
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else
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seq_printf(m, "%5u: <none>\n", i);
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}
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seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
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for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
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struct io_mapped_ubuf *buf = ctx->user_bufs[i];
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unsigned int len = buf->ubuf_end - buf->ubuf;
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seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len);
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}
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if (has_lock && !xa_empty(&ctx->personalities)) {
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unsigned long index;
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const struct cred *cred;
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seq_printf(m, "Personalities:\n");
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xa_for_each(&ctx->personalities, index, cred)
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io_uring_show_cred(m, index, cred);
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}
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if (has_lock)
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mutex_unlock(&ctx->uring_lock);
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seq_puts(m, "PollList:\n");
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spin_lock(&ctx->completion_lock);
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for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
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struct hlist_head *list = &ctx->cancel_hash[i];
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struct io_kiocb *req;
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hlist_for_each_entry(req, list, hash_node)
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seq_printf(m, " op=%d, task_works=%d\n", req->opcode,
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task_work_pending(req->task));
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}
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seq_puts(m, "CqOverflowList:\n");
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list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) {
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struct io_uring_cqe *cqe = &ocqe->cqe;
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seq_printf(m, " user_data=%llu, res=%d, flags=%x\n",
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cqe->user_data, cqe->res, cqe->flags);
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}
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spin_unlock(&ctx->completion_lock);
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}
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__cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
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{
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struct io_ring_ctx *ctx = f->private_data;
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if (percpu_ref_tryget(&ctx->refs)) {
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__io_uring_show_fdinfo(ctx, m);
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percpu_ref_put(&ctx->refs);
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}
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}
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#endif
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3
io_uring/fdinfo.h
Normal file
3
io_uring/fdinfo.h
Normal file
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@ -0,0 +1,3 @@
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// SPDX-License-Identifier: GPL-2.0
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void io_uring_show_fdinfo(struct seq_file *m, struct file *f);
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@ -36,6 +36,8 @@ bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
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void io_free_file_tables(struct io_file_table *table);
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int io_file_bitmap_get(struct io_ring_ctx *ctx);
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unsigned int io_file_get_flags(struct file *file);
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static inline void io_file_bitmap_clear(struct io_file_table *table, int bit)
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{
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__clear_bit(bit, table->bitmap);
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@ -55,4 +57,21 @@ io_fixed_file_slot(struct io_file_table *table, unsigned i)
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return &table->files[i];
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}
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static inline struct file *io_file_from_index(struct io_file_table *table,
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int index)
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{
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struct io_fixed_file *slot = io_fixed_file_slot(table, index);
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return (struct file *) (slot->file_ptr & FFS_MASK);
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}
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static inline void io_fixed_file_set(struct io_fixed_file *file_slot,
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struct file *file)
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{
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unsigned long file_ptr = (unsigned long) file;
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file_ptr |= io_file_get_flags(file);
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file_slot->file_ptr = file_ptr;
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}
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#endif
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@ -93,6 +93,7 @@
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#include "io_uring.h"
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#include "refs.h"
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#include "sqpoll.h"
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#include "fdinfo.h"
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#include "xattr.h"
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#include "nop.h"
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@ -137,21 +138,8 @@
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#define IO_TCTX_REFS_CACHE_NR (1U << 10)
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struct io_mapped_ubuf {
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u64 ubuf;
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u64 ubuf_end;
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unsigned int nr_bvecs;
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unsigned long acct_pages;
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struct bio_vec bvec[];
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};
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struct io_ring_ctx;
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struct io_overflow_cqe {
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struct list_head list;
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struct io_uring_cqe cqe;
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};
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struct io_rsrc_put {
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struct list_head list;
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u64 tag;
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@ -2325,7 +2313,7 @@ static bool __io_file_supports_nowait(struct file *file, umode_t mode)
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* any file. For now, just ensure that anything potentially problematic is done
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* inline.
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*/
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static unsigned int io_file_get_flags(struct file *file)
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unsigned int io_file_get_flags(struct file *file)
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{
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umode_t mode = file_inode(file)->i_mode;
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unsigned int res = 0;
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@ -4810,22 +4798,6 @@ static void io_wq_submit_work(struct io_wq_work *work)
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io_req_task_queue_fail(req, ret);
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}
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static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
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int index)
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{
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struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index);
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return (struct file *) (slot->file_ptr & FFS_MASK);
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}
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static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file)
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{
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unsigned long file_ptr = (unsigned long) file;
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file_ptr |= io_file_get_flags(file);
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file_slot->file_ptr = file_ptr;
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}
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inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
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unsigned int issue_flags)
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{
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@ -5667,7 +5639,7 @@ static void __io_sqe_files_unregister(struct io_ring_ctx *ctx)
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int i;
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for (i = 0; i < ctx->nr_user_files; i++) {
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struct file *file = io_file_from_index(ctx, i);
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struct file *file = io_file_from_index(&ctx->file_table, i);
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if (!file)
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continue;
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@ -7777,182 +7749,6 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
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return ret;
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}
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#ifdef CONFIG_PROC_FS
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static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id,
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const struct cred *cred)
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{
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struct user_namespace *uns = seq_user_ns(m);
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struct group_info *gi;
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kernel_cap_t cap;
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unsigned __capi;
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int g;
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seq_printf(m, "%5d\n", id);
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seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid));
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seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid));
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seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid));
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seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid));
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seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid));
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seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid));
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seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid));
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seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid));
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seq_puts(m, "\n\tGroups:\t");
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gi = cred->group_info;
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for (g = 0; g < gi->ngroups; g++) {
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seq_put_decimal_ull(m, g ? " " : "",
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from_kgid_munged(uns, gi->gid[g]));
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}
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seq_puts(m, "\n\tCapEff:\t");
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cap = cred->cap_effective;
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CAP_FOR_EACH_U32(__capi)
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seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8);
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seq_putc(m, '\n');
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return 0;
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}
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static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
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struct seq_file *m)
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{
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struct io_sq_data *sq = NULL;
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struct io_overflow_cqe *ocqe;
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struct io_rings *r = ctx->rings;
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unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1;
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unsigned int sq_head = READ_ONCE(r->sq.head);
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unsigned int sq_tail = READ_ONCE(r->sq.tail);
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unsigned int cq_head = READ_ONCE(r->cq.head);
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unsigned int cq_tail = READ_ONCE(r->cq.tail);
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unsigned int cq_shift = 0;
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unsigned int sq_entries, cq_entries;
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bool has_lock;
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bool is_cqe32 = (ctx->flags & IORING_SETUP_CQE32);
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unsigned int i;
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if (is_cqe32)
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cq_shift = 1;
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/*
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* we may get imprecise sqe and cqe info if uring is actively running
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* since we get cached_sq_head and cached_cq_tail without uring_lock
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* and sq_tail and cq_head are changed by userspace. But it's ok since
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* we usually use these info when it is stuck.
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*/
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seq_printf(m, "SqMask:\t0x%x\n", sq_mask);
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seq_printf(m, "SqHead:\t%u\n", sq_head);
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seq_printf(m, "SqTail:\t%u\n", sq_tail);
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seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head);
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seq_printf(m, "CqMask:\t0x%x\n", cq_mask);
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seq_printf(m, "CqHead:\t%u\n", cq_head);
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seq_printf(m, "CqTail:\t%u\n", cq_tail);
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seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail);
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seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head);
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sq_entries = min(sq_tail - sq_head, ctx->sq_entries);
|
||||
for (i = 0; i < sq_entries; i++) {
|
||||
unsigned int entry = i + sq_head;
|
||||
unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
|
||||
struct io_uring_sqe *sqe;
|
||||
|
||||
if (sq_idx > sq_mask)
|
||||
continue;
|
||||
sqe = &ctx->sq_sqes[sq_idx];
|
||||
seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n",
|
||||
sq_idx, sqe->opcode, sqe->fd, sqe->flags,
|
||||
sqe->user_data);
|
||||
}
|
||||
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];
|
||||
|
||||
if (!is_cqe32) {
|
||||
seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n",
|
||||
entry & cq_mask, cqe->user_data, cqe->res,
|
||||
cqe->flags);
|
||||
} else {
|
||||
seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x, "
|
||||
"extra1:%llu, extra2:%llu\n",
|
||||
entry & cq_mask, cqe->user_data, cqe->res,
|
||||
cqe->flags, cqe->big_cqe[0], cqe->big_cqe[1]);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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)) {
|
||||
sq = ctx->sq_data;
|
||||
if (!sq->thread)
|
||||
sq = NULL;
|
||||
}
|
||||
|
||||
seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1);
|
||||
seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1);
|
||||
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, 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);
|
||||
}
|
||||
if (has_lock)
|
||||
mutex_unlock(&ctx->uring_lock);
|
||||
|
||||
seq_puts(m, "PollList:\n");
|
||||
spin_lock(&ctx->completion_lock);
|
||||
for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
|
||||
struct hlist_head *list = &ctx->cancel_hash[i];
|
||||
struct io_kiocb *req;
|
||||
|
||||
hlist_for_each_entry(req, list, hash_node)
|
||||
seq_printf(m, " op=%d, task_works=%d\n", req->opcode,
|
||||
task_work_pending(req->task));
|
||||
}
|
||||
|
||||
seq_puts(m, "CqOverflowList:\n");
|
||||
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);
|
||||
}
|
||||
|
||||
static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
|
||||
{
|
||||
struct io_ring_ctx *ctx = f->private_data;
|
||||
|
||||
if (percpu_ref_tryget(&ctx->refs)) {
|
||||
__io_uring_show_fdinfo(ctx, m);
|
||||
percpu_ref_put(&ctx->refs);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct file_operations io_uring_fops = {
|
||||
.release = io_uring_release,
|
||||
.mmap = io_uring_mmap,
|
||||
|
|
|
|||
|
|
@ -498,4 +498,17 @@ struct io_cancel_data {
|
|||
int seq;
|
||||
};
|
||||
|
||||
struct io_overflow_cqe {
|
||||
struct list_head list;
|
||||
struct io_uring_cqe cqe;
|
||||
};
|
||||
|
||||
struct io_mapped_ubuf {
|
||||
u64 ubuf;
|
||||
u64 ubuf_end;
|
||||
unsigned int nr_bvecs;
|
||||
unsigned long acct_pages;
|
||||
struct bio_vec bvec[];
|
||||
};
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user