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-rw-r--r--io_uring/fs.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/io_uring/fs.c b/io_uring/fs.c
new file mode 100644
index 0000000000..eccea851dd
--- /dev/null
+++ b/io_uring/fs.c
@@ -0,0 +1,293 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/io_uring.h>
+
+#include <uapi/linux/io_uring.h>
+
+#include "../fs/internal.h"
+
+#include "io_uring.h"
+#include "fs.h"
+
+struct io_rename {
+ struct file *file;
+ int old_dfd;
+ int new_dfd;
+ struct filename *oldpath;
+ struct filename *newpath;
+ int flags;
+};
+
+struct io_unlink {
+ struct file *file;
+ int dfd;
+ int flags;
+ struct filename *filename;
+};
+
+struct io_mkdir {
+ struct file *file;
+ int dfd;
+ umode_t mode;
+ struct filename *filename;
+};
+
+struct io_link {
+ struct file *file;
+ int old_dfd;
+ int new_dfd;
+ struct filename *oldpath;
+ struct filename *newpath;
+ int flags;
+};
+
+int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
+ const char __user *oldf, *newf;
+
+ if (sqe->buf_index || sqe->splice_fd_in)
+ return -EINVAL;
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ ren->old_dfd = READ_ONCE(sqe->fd);
+ oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ ren->new_dfd = READ_ONCE(sqe->len);
+ ren->flags = READ_ONCE(sqe->rename_flags);
+
+ ren->oldpath = getname(oldf);
+ if (IS_ERR(ren->oldpath))
+ return PTR_ERR(ren->oldpath);
+
+ ren->newpath = getname(newf);
+ if (IS_ERR(ren->newpath)) {
+ putname(ren->oldpath);
+ return PTR_ERR(ren->newpath);
+ }
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
+ ren->newpath, ren->flags);
+
+ req->flags &= ~REQ_F_NEED_CLEANUP;
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+}
+
+void io_renameat_cleanup(struct io_kiocb *req)
+{
+ struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
+
+ putname(ren->oldpath);
+ putname(ren->newpath);
+}
+
+int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
+ const char __user *fname;
+
+ if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in)
+ return -EINVAL;
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ un->dfd = READ_ONCE(sqe->fd);
+
+ un->flags = READ_ONCE(sqe->unlink_flags);
+ if (un->flags & ~AT_REMOVEDIR)
+ return -EINVAL;
+
+ fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ un->filename = getname(fname);
+ if (IS_ERR(un->filename))
+ return PTR_ERR(un->filename);
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ if (un->flags & AT_REMOVEDIR)
+ ret = do_rmdir(un->dfd, un->filename);
+ else
+ ret = do_unlinkat(un->dfd, un->filename);
+
+ req->flags &= ~REQ_F_NEED_CLEANUP;
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+}
+
+void io_unlinkat_cleanup(struct io_kiocb *req)
+{
+ struct io_unlink *ul = io_kiocb_to_cmd(req, struct io_unlink);
+
+ putname(ul->filename);
+}
+
+int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
+ const char __user *fname;
+
+ if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
+ return -EINVAL;
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ mkd->dfd = READ_ONCE(sqe->fd);
+ mkd->mode = READ_ONCE(sqe->len);
+
+ fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ mkd->filename = getname(fname);
+ if (IS_ERR(mkd->filename))
+ return PTR_ERR(mkd->filename);
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);
+
+ req->flags &= ~REQ_F_NEED_CLEANUP;
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+}
+
+void io_mkdirat_cleanup(struct io_kiocb *req)
+{
+ struct io_mkdir *md = io_kiocb_to_cmd(req, struct io_mkdir);
+
+ putname(md->filename);
+}
+
+int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
+ const char __user *oldpath, *newpath;
+
+ if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
+ return -EINVAL;
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ sl->new_dfd = READ_ONCE(sqe->fd);
+ oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+
+ sl->oldpath = getname(oldpath);
+ if (IS_ERR(sl->oldpath))
+ return PTR_ERR(sl->oldpath);
+
+ sl->newpath = getname(newpath);
+ if (IS_ERR(sl->newpath)) {
+ putname(sl->oldpath);
+ return PTR_ERR(sl->newpath);
+ }
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
+
+ req->flags &= ~REQ_F_NEED_CLEANUP;
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+}
+
+int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
+ const char __user *oldf, *newf;
+
+ if (sqe->buf_index || sqe->splice_fd_in)
+ return -EINVAL;
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ lnk->old_dfd = READ_ONCE(sqe->fd);
+ lnk->new_dfd = READ_ONCE(sqe->len);
+ oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ lnk->flags = READ_ONCE(sqe->hardlink_flags);
+
+ lnk->oldpath = getname_uflags(oldf, lnk->flags);
+ if (IS_ERR(lnk->oldpath))
+ return PTR_ERR(lnk->oldpath);
+
+ lnk->newpath = getname(newf);
+ if (IS_ERR(lnk->newpath)) {
+ putname(lnk->oldpath);
+ return PTR_ERR(lnk->newpath);
+ }
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
+ lnk->newpath, lnk->flags);
+
+ req->flags &= ~REQ_F_NEED_CLEANUP;
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+}
+
+void io_link_cleanup(struct io_kiocb *req)
+{
+ struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
+
+ putname(sl->oldpath);
+ putname(sl->newpath);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 11:13:23 +0000