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io_uring: fix issue with io_write() not always undoing sb_start_write()

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This is actually an older issue, but we never used to hit the -EAGAIN
path before having done sb_start_write(). Make sure that we always call
kiocb_end_write() if we need to retry the write, so that we keep the
calls to sb_start_write() etc balanced.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-06-24 10:24:45 -06:00
parent 4e17aaab54
commit e053aaf4da
1 changed files with 8 additions and 1 deletions
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9
io_uring/rw.c
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@ -945,6 +945,8 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
if (rw)
rw->bytes_done += ret2;
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
return ret ? ret : -EAGAIN;
}
done:
@ -953,7 +955,12 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
copy_iov:
iov_iter_restore(&s->iter, &s->iter_state);
ret = io_setup_async_rw(req, iovec, s, false);
return ret ?: -EAGAIN;
if (!ret) {
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
return -EAGAIN;
}
return ret;
}
/* it's reportedly faster than delegating the null check to kfree() */
if (iovec)