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authorJens Axboe <axboe@kernel.dk>2021-01-24 01:49:31 +0300
committerJens Axboe <axboe@kernel.dk>2021-01-24 20:15:33 +0300
commit02a13674fa0e8dd326de8b9f4514b41b03d99003 (patch)
tree2334216d23c483734b1deec80551e35045e47d30 /fs
parent9d5c8190683a462dbc787658467a0da17011ea5f (diff)
downloadlinux-02a13674fa0e8dd326de8b9f4514b41b03d99003.tar.xz
io_uring: account io_uring internal files as REQ_F_INFLIGHT
We need to actively cancel anything that introduces a potential circular loop, where io_uring holds a reference to itself. If the file in question is an io_uring file, then add the request to the inflight list. Cc: stable@vger.kernel.org # 5.9+ Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
-rw-r--r--fs/io_uring.c36
1 files changed, 26 insertions, 10 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 8a98afed50cd..c07913ec0cca 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1075,8 +1075,11 @@ static bool io_match_task(struct io_kiocb *head,
return true;
io_for_each_link(req, head) {
- if ((req->flags & REQ_F_WORK_INITIALIZED) &&
- (req->work.flags & IO_WQ_WORK_FILES) &&
+ if (!(req->flags & REQ_F_WORK_INITIALIZED))
+ continue;
+ if (req->file && req->file->f_op == &io_uring_fops)
+ return true;
+ if ((req->work.flags & IO_WQ_WORK_FILES) &&
req->work.identity->files == files)
return true;
}
@@ -1505,11 +1508,14 @@ static bool io_grab_identity(struct io_kiocb *req)
return false;
atomic_inc(&id->files->count);
get_nsproxy(id->nsproxy);
- req->flags |= REQ_F_INFLIGHT;
- spin_lock_irq(&ctx->inflight_lock);
- list_add(&req->inflight_entry, &ctx->inflight_list);
- spin_unlock_irq(&ctx->inflight_lock);
+ if (!(req->flags & REQ_F_INFLIGHT)) {
+ req->flags |= REQ_F_INFLIGHT;
+
+ spin_lock_irq(&ctx->inflight_lock);
+ list_add(&req->inflight_entry, &ctx->inflight_list);
+ spin_unlock_irq(&ctx->inflight_lock);
+ }
req->work.flags |= IO_WQ_WORK_FILES;
}
if (!(req->work.flags & IO_WQ_WORK_MM) &&
@@ -6164,8 +6170,10 @@ static void io_req_drop_files(struct io_kiocb *req)
struct io_uring_task *tctx = req->task->io_uring;
unsigned long flags;
- put_files_struct(req->work.identity->files);
- put_nsproxy(req->work.identity->nsproxy);
+ if (req->work.flags & IO_WQ_WORK_FILES) {
+ put_files_struct(req->work.identity->files);
+ put_nsproxy(req->work.identity->nsproxy);
+ }
spin_lock_irqsave(&ctx->inflight_lock, flags);
list_del(&req->inflight_entry);
spin_unlock_irqrestore(&ctx->inflight_lock, flags);
@@ -6450,6 +6458,15 @@ static struct file *io_file_get(struct io_submit_state *state,
file = __io_file_get(state, fd);
}
+ if (file && file->f_op == &io_uring_fops) {
+ io_req_init_async(req);
+ req->flags |= REQ_F_INFLIGHT;
+
+ spin_lock_irq(&ctx->inflight_lock);
+ list_add(&req->inflight_entry, &ctx->inflight_list);
+ spin_unlock_irq(&ctx->inflight_lock);
+ }
+
return file;
}
@@ -8860,8 +8877,7 @@ static void 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 (req->task != task ||
- req->work.identity->files != files)
+ if (!io_match_task(req, task, files))
continue;
found = true;
break;