With the previous fixes for number of files open checking, I added
some debug code to see if we had other spots where we're checking
rlimit() against the async io-wq workers. The only one I found was
file size checking, which we should also honor.
During write prep, store the max file size and override that for
the current ask if we're in io-wq worker context.
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 731a91b772a3..cdc4216a164f 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -606,7 +606,10 @@ struct io_kiocb {
struct list_head list;
unsigned int flags;
refcount_t refs;
- struct task_struct *task;
+ union {
+ struct task_struct *task;
+ unsigned long fsize;
+ };
u64 user_data;
u32 result;
u32 sequence;
@@ -2596,6 +2599,8 @@ static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
return -EBADF;
+ req->fsize = rlimit(RLIMIT_FSIZE);
+
/* either don't need iovec imported or already have it */
if (!req->io || req->flags & REQ_F_NEED_CLEANUP)
return 0;
@@ -2665,10 +2670,17 @@ static int io_write(struct io_kiocb *req, bool force_nonblock)
}
kiocb->ki_flags |= IOCB_WRITE;
+ if (!force_nonblock)
+ current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize;
+
if (req->file->f_op->write_iter)
ret2 = call_write_iter(req->file, kiocb, &iter);
else
ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter);
+
+ if (!force_nonblock)
+ current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
+
/*
* Raw bdev writes will -EOPNOTSUPP for IOCB_NOWAIT. Just
* retry them without IOCB_NOWAIT.
--
Jens Axboe
