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io_uring: call statx directly

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Calling statx directly both simplifies the interface and avoids potential
incompatibilities between sync and async invokations.

Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bijan Mottahedeh 2020-05-22 21:31:18 -07:00 committed by Jens Axboe
parent 0018784fc8
commit e62753e4e2
1 changed files with 4 additions and 46 deletions
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50
fs/io_uring.c
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@ -482,7 +482,7 @@ struct io_statx {
int dfd;
unsigned int mask;
unsigned int flags;
struct filename *filename;
const char __user *filename;
struct statx __user *buffer;
};
@ -3376,43 +3376,23 @@ static int io_fadvise(struct io_kiocb *req, bool force_nonblock)
static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
const char __user *fname;
unsigned lookup_flags;
int ret;
if (sqe->ioprio || sqe->buf_index)
return -EINVAL;
if (req->flags & REQ_F_FIXED_FILE)
return -EBADF;
if (req->flags & REQ_F_NEED_CLEANUP)
return 0;
req->statx.dfd = READ_ONCE(sqe->fd);
req->statx.mask = READ_ONCE(sqe->len);
fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr));
req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
req->statx.flags = READ_ONCE(sqe->statx_flags);
if (vfs_stat_set_lookup_flags(&lookup_flags, req->statx.flags))
return -EINVAL;
req->statx.filename = getname_flags(fname, lookup_flags, NULL);
if (IS_ERR(req->statx.filename)) {
ret = PTR_ERR(req->statx.filename);
req->statx.filename = NULL;
return ret;
}
req->flags |= REQ_F_NEED_CLEANUP;
return 0;
}
static int io_statx(struct io_kiocb *req, bool force_nonblock)
{
struct io_statx *ctx = &req->statx;
unsigned lookup_flags;
struct path path;
struct kstat stat;
int ret;
if (force_nonblock) {
@ -3422,29 +3402,9 @@ static int io_statx(struct io_kiocb *req, bool force_nonblock)
return -EAGAIN;
}
if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->flags))
return -EINVAL;
ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask,
ctx->buffer);
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);
req->flags &= ~REQ_F_NEED_CLEANUP;
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
@ -5196,8 +5156,6 @@ static void io_cleanup_req(struct io_kiocb *req)
break;
case IORING_OP_OPENAT:
case IORING_OP_OPENAT2:
case IORING_OP_STATX:
putname(req->open.filename);
break;
case IORING_OP_SPLICE:
case IORING_OP_TEE: