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io_uring: move io identity items into separate struct 

io-wq contains a pointer to the identity, which we just hold in io_kiocb
for now. This is in preparation for putting this outside io_kiocb. The
only exception is struct files_struct, which we'll need different rules
for to avoid a circular dependency.

No functional changes in this patch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-10-14 10:48:51 -06:00
parent dfead8a8e2
commit 98447d65b4
4 changed files with 64 additions and 57 deletions
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34
fs/io-wq.c
View File

@ -430,9 +430,9 @@ static void io_wq_switch_mm(struct io_worker *worker, struct io_wq_work *work)
worker->mm = NULL;
}
if (mmget_not_zero(work->mm)) {
kthread_use_mm(work->mm);
worker->mm = work->mm;
if (mmget_not_zero(work->identity->mm)) {
kthread_use_mm(work->identity->mm);
worker->mm = work->identity->mm;
return;
}
@ -446,9 +446,9 @@ static inline void io_wq_switch_blkcg(struct io_worker *worker,
#ifdef CONFIG_BLK_CGROUP
if (!(work->flags & IO_WQ_WORK_BLKCG))
return;
if (work->blkcg_css != worker->blkcg_css) {
kthread_associate_blkcg(work->blkcg_css);
worker->blkcg_css = work->blkcg_css;
if (work->identity->blkcg_css != worker->blkcg_css) {
kthread_associate_blkcg(work->identity->blkcg_css);
worker->blkcg_css = work->identity->blkcg_css;
}
#endif
}
@ -456,9 +456,9 @@ static inline void io_wq_switch_blkcg(struct io_worker *worker,
static void io_wq_switch_creds(struct io_worker *worker,
struct io_wq_work *work)
{
const struct cred *old_creds = override_creds(work->creds);
const struct cred *old_creds = override_creds(work->identity->creds);
worker->cur_creds = work->creds;
worker->cur_creds = work->identity->creds;
if (worker->saved_creds)
put_cred(old_creds); /* creds set by previous switch */
else
@ -468,19 +468,21 @@ static void io_wq_switch_creds(struct io_worker *worker,
static void io_impersonate_work(struct io_worker *worker,
struct io_wq_work *work)
{
if ((work->flags & IO_WQ_WORK_FILES) && current->files != work->files) {
if ((work->flags & IO_WQ_WORK_FILES) &&
current->files != work->identity->files) {
task_lock(current);
current->files = work->files;
current->nsproxy = work->nsproxy;
current->files = work->identity->files;
current->nsproxy = work->identity->nsproxy;
task_unlock(current);
}
if ((work->flags & IO_WQ_WORK_FS) && current->fs != work->fs)
current->fs = work->fs;
if ((work->flags & IO_WQ_WORK_MM) && work->mm != worker->mm)
if ((work->flags & IO_WQ_WORK_FS) && current->fs != work->identity->fs)
current->fs = work->identity->fs;
if ((work->flags & IO_WQ_WORK_MM) && work->identity->mm != worker->mm)
io_wq_switch_mm(worker, work);
if ((work->flags & IO_WQ_WORK_CREDS) && worker->cur_creds != work->creds)
if ((work->flags & IO_WQ_WORK_CREDS) &&
worker->cur_creds != work->identity->creds)
io_wq_switch_creds(worker, work);
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = work->fsize;
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = work->identity->fsize;
io_wq_switch_blkcg(worker, work);
}

12
fs/io-wq.h
View File

@ -1,6 +1,8 @@
#ifndef INTERNAL_IO_WQ_H
#define INTERNAL_IO_WQ_H
#include <linux/io_uring.h>
struct io_wq;
enum {
@ -91,15 +93,7 @@ static inline void wq_list_del(struct io_wq_work_list *list,
struct io_wq_work {
struct io_wq_work_node list;
struct files_struct *files;
struct mm_struct *mm;
#ifdef CONFIG_BLK_CGROUP
struct cgroup_subsys_state *blkcg_css;
#endif
const struct cred *creds;
struct nsproxy *nsproxy;
struct fs_struct *fs;
unsigned long fsize;
struct io_identity *identity;
unsigned flags;
};

62
fs/io_uring.c
View File

@ -689,6 +689,7 @@ struct io_kiocb {
struct hlist_node hash_node;
struct async_poll *apoll;
struct io_wq_work work;
struct io_identity identity;
};
struct io_defer_entry {
@ -1050,6 +1051,7 @@ static inline void io_req_init_async(struct io_kiocb *req)
memset(&req->work, 0, sizeof(req->work));
req->flags |= REQ_F_WORK_INITIALIZED;
req->work.identity = &req->identity;
}
static inline bool io_async_submit(struct io_ring_ctx *ctx)
@ -1163,26 +1165,26 @@ static void io_req_clean_work(struct io_kiocb *req)
req->flags &= ~REQ_F_WORK_INITIALIZED;
if (req->work.flags & IO_WQ_WORK_MM) {
mmdrop(req->work.mm);
mmdrop(req->work.identity->mm);
req->work.flags &= ~IO_WQ_WORK_MM;
}
#ifdef CONFIG_BLK_CGROUP
if (req->work.flags & IO_WQ_WORK_BLKCG) {
css_put(req->work.blkcg_css);
css_put(req->work.identity->blkcg_css);
req->work.flags &= ~IO_WQ_WORK_BLKCG;
}
#endif
if (req->work.flags & IO_WQ_WORK_CREDS) {
put_cred(req->work.creds);
put_cred(req->work.identity->creds);
req->work.flags &= ~IO_WQ_WORK_CREDS;
}
if (req->work.flags & IO_WQ_WORK_FS) {
struct fs_struct *fs = req->work.fs;
struct fs_struct *fs = req->work.identity->fs;
spin_lock(&req->work.fs->lock);
spin_lock(&req->work.identity->fs->lock);
if (--fs->users)
fs = NULL;
spin_unlock(&req->work.fs->lock);
spin_unlock(&req->work.identity->fs->lock);
if (fs)
free_fs_struct(fs);
req->work.flags &= ~IO_WQ_WORK_FS;
@ -1206,9 +1208,9 @@ static void io_prep_async_work(struct io_kiocb *req)
if (!(req->work.flags & IO_WQ_WORK_FILES) &&
(io_op_defs[req->opcode].work_flags & IO_WQ_WORK_FILES) &&
!(req->flags & REQ_F_NO_FILE_TABLE)) {
req->work.files = get_files_struct(current);
req->work.identity->files = get_files_struct(current);
get_nsproxy(current->nsproxy);
req->work.nsproxy = current->nsproxy;
req->work.identity->nsproxy = current->nsproxy;
req->flags |= REQ_F_INFLIGHT;
spin_lock_irq(&ctx->inflight_lock);
@ -1219,35 +1221,33 @@ static void io_prep_async_work(struct io_kiocb *req)
if (!(req->work.flags & IO_WQ_WORK_MM) &&
(def->work_flags & IO_WQ_WORK_MM)) {
mmgrab(current->mm);
req->work.mm = current->mm;
req->work.identity->mm = current->mm;
req->work.flags |= IO_WQ_WORK_MM;
}
#ifdef CONFIG_BLK_CGROUP
if (!(req->work.flags & IO_WQ_WORK_BLKCG) &&
(def->work_flags & IO_WQ_WORK_BLKCG)) {
rcu_read_lock();
req->work.blkcg_css = blkcg_css();
req->work.identity->blkcg_css = blkcg_css();
/*
* This should be rare, either the cgroup is dying or the task
* is moving cgroups. Just punt to root for the handful of ios.
*/
if (!css_tryget_online(req->work.blkcg_css))
req->work.blkcg_css = NULL;
else
if (css_tryget_online(req->work.identity->blkcg_css))
req->work.flags |= IO_WQ_WORK_BLKCG;
rcu_read_unlock();
}
#endif
if (!(req->work.flags & IO_WQ_WORK_CREDS)) {
req->work.creds = get_current_cred();
req->work.identity->creds = get_current_cred();
req->work.flags |= IO_WQ_WORK_CREDS;
}
if (!(req->work.flags & IO_WQ_WORK_FS) &&
(def->work_flags & IO_WQ_WORK_FS)) {
spin_lock(&current->fs->lock);
if (!current->fs->in_exec) {
req->work.fs = current->fs;
req->work.fs->users++;
req->work.identity->fs = current->fs;
req->work.identity->fs->users++;
req->work.flags |= IO_WQ_WORK_FS;
} else {
req->work.flags |= IO_WQ_WORK_CANCEL;
@ -1255,9 +1255,9 @@ static void io_prep_async_work(struct io_kiocb *req)
spin_unlock(&current->fs->lock);
}
if (def->needs_fsize)
req->work.fsize = rlimit(RLIMIT_FSIZE);
req->work.identity->fsize = rlimit(RLIMIT_FSIZE);
else
req->work.fsize = RLIM_INFINITY;
req->work.identity->fsize = RLIM_INFINITY;
}
static void io_prep_async_link(struct io_kiocb *req)
@ -1449,7 +1449,7 @@ static inline bool io_match_files(struct io_kiocb *req,
return true;
if ((req->flags & REQ_F_WORK_INITIALIZED) &&
(req->work.flags & IO_WQ_WORK_FILES))
return req->work.files == files;
return req->work.identity->files == files;
return false;
}
@ -4089,7 +4089,7 @@ static int io_close(struct io_kiocb *req, bool force_nonblock,
}
/* No ->flush() or already async, safely close from here */
ret = filp_close(close->put_file, req->work.files);
ret = filp_close(close->put_file, req->work.identity->files);
if (ret < 0)
req_set_fail_links(req);
fput(close->put_file);
@ -5703,8 +5703,8 @@ static void io_req_drop_files(struct io_kiocb *req)
wake_up(&ctx->inflight_wait);
spin_unlock_irqrestore(&ctx->inflight_lock, flags);
req->flags &= ~REQ_F_INFLIGHT;
put_files_struct(req->work.files);
put_nsproxy(req->work.nsproxy);
put_files_struct(req->work.identity->files);
put_nsproxy(req->work.identity->nsproxy);
req->work.flags &= ~IO_WQ_WORK_FILES;
}
@ -6063,14 +6063,14 @@ static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
again:
linked_timeout = io_prep_linked_timeout(req);
if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds &&
req->work.creds != current_cred()) {
if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.identity->creds &&
req->work.identity->creds != current_cred()) {
if (old_creds)
revert_creds(old_creds);
if (old_creds == req->work.creds)
if (old_creds == req->work.identity->creds)
old_creds = NULL; /* restored original creds */
else
old_creds = override_creds(req->work.creds);
old_creds = override_creds(req->work.identity->creds);
req->work.flags |= IO_WQ_WORK_CREDS;
}
@ -6375,10 +6375,10 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
id = READ_ONCE(sqe->personality);
if (id) {
io_req_init_async(req);
req->work.creds = idr_find(&ctx->personality_idr, id);
if (unlikely(!req->work.creds))
req->work.identity->creds = idr_find(&ctx->personality_idr, id);
if (unlikely(!req->work.identity->creds))
return -EINVAL;
get_cred(req->work.creds);
get_cred(req->work.identity->creds);
req->work.flags |= IO_WQ_WORK_CREDS;
}
@ -8248,7 +8248,7 @@ static bool io_wq_files_match(struct io_wq_work *work, void *data)
struct files_struct *files = data;
return !files || ((work->flags & IO_WQ_WORK_FILES) &&
work->files == files);
work->identity->files == files);
}
/*
@ -8404,7 +8404,7 @@ static bool io_uring_cancel_files(struct io_ring_ctx *ctx,
spin_lock_irq(&ctx->inflight_lock);
list_for_each_entry(req, &ctx->inflight_list, inflight_entry) {
if (files && (req->work.flags & IO_WQ_WORK_FILES) &&
req->work.files != files)
req->work.identity->files != files)
continue;
/* req is being completed, ignore */
if (!refcount_inc_not_zero(&req->refs))

13
include/linux/io_uring.h
View File

@ -4,7 +4,18 @@
#include <linux/sched.h>
#include <linux/xarray.h>
#include <linux/percpu-refcount.h>
struct io_identity {
struct files_struct *files;
struct mm_struct *mm;
#ifdef CONFIG_BLK_CGROUP
struct cgroup_subsys_state *blkcg_css;
#endif
const struct cred *creds;
struct nsproxy *nsproxy;
struct fs_struct *fs;
unsigned long fsize;
};
struct io_uring_task {
/* submission side */