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io_uring: add support for IORING_OP_STATX

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This provides support for async statx(2) through io_uring.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-12-13 21:18:10 -07:00
parent 3934e36f60
commit eddc7ef52a
2 changed files with 87 additions and 1 deletions
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86
fs/io_uring.c
View File

@ -379,9 +379,13 @@ struct io_sr_msg {
struct io_open {
struct file *file;
int dfd;
umode_t mode;
union {
umode_t mode;
unsigned mask;
};
const char __user *fname;
struct filename *filename;
struct statx __user *buffer;
int flags;
};
@ -2266,6 +2270,74 @@ err:
return 0;
}
static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
unsigned lookup_flags;
int ret;
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
req->open.dfd = READ_ONCE(sqe->fd);
req->open.mask = READ_ONCE(sqe->len);
req->open.fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
req->open.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
req->open.flags = READ_ONCE(sqe->statx_flags);
if (vfs_stat_set_lookup_flags(&lookup_flags, req->open.flags))
return -EINVAL;
req->open.filename = getname_flags(req->open.fname, lookup_flags, NULL);
if (IS_ERR(req->open.filename)) {
ret = PTR_ERR(req->open.filename);
req->open.filename = NULL;
return ret;
}
return 0;
}
static int io_statx(struct io_kiocb *req, struct io_kiocb **nxt,
bool force_nonblock)
{
struct io_open *ctx = &req->open;
unsigned lookup_flags;
struct path path;
struct kstat stat;
int ret;
if (force_nonblock)
return -EAGAIN;
if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->flags))
return -EINVAL;
retry:
/* filename_lookup() drops it, keep a reference */
ctx->filename->refcnt++;
ret = filename_lookup(ctx->dfd, ctx->filename, lookup_flags, &path,
NULL);
if (ret)
goto err;
ret = vfs_getattr(&path, &stat, ctx->mask, ctx->flags);
path_put(&path);
if (retry_estale(ret, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
if (!ret)
ret = cp_statx(&stat, ctx->buffer);
err:
putname(ctx->filename);
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
io_put_req_find_next(req, nxt);
return 0;
}
static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
/*
@ -3427,6 +3499,9 @@ static int io_req_defer_prep(struct io_kiocb *req,
case IORING_OP_FILES_UPDATE:
ret = io_files_update_prep(req, sqe);
break;
case IORING_OP_STATX:
ret = io_statx_prep(req, sqe);
break;
default:
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
req->opcode);
@ -3613,6 +3688,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
}
ret = io_files_update(req, force_nonblock);
break;
case IORING_OP_STATX:
if (sqe) {
ret = io_statx_prep(req, sqe);
if (ret)
break;
}
ret = io_statx(req, nxt, force_nonblock);
break;
default:
ret = -EINVAL;
break;
@ -3699,6 +3782,7 @@ static int io_req_needs_file(struct io_kiocb *req, int fd)
case IORING_OP_LINK_TIMEOUT:
return 0;
case IORING_OP_OPENAT:
case IORING_OP_STATX:
return fd != -1;
default:
if (io_req_op_valid(req->opcode))

2
include/uapi/linux/io_uring.h
View File

@ -35,6 +35,7 @@ struct io_uring_sqe {
__u32 accept_flags;
__u32 cancel_flags;
__u32 open_flags;
__u32 statx_flags;
};
__u64 user_data; /* data to be passed back at completion time */
union {
@ -81,6 +82,7 @@ enum {
IORING_OP_OPENAT,
IORING_OP_CLOSE,
IORING_OP_FILES_UPDATE,
IORING_OP_STATX,
/* this goes last, obviously */
IORING_OP_LAST,