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-rw-r--r--io_uring/xattr.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/io_uring/xattr.c b/io_uring/xattr.c
new file mode 100644
index 0000000000..e1c810e0b8
--- /dev/null
+++ b/io_uring/xattr.c
@@ -0,0 +1,254 @@
+// 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 <linux/xattr.h>
+
+#include <uapi/linux/io_uring.h>
+
+#include "../fs/internal.h"
+
+#include "io_uring.h"
+#include "xattr.h"
+
+struct io_xattr {
+ struct file *file;
+ struct xattr_ctx ctx;
+ struct filename *filename;
+};
+
+void io_xattr_cleanup(struct io_kiocb *req)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+
+ if (ix->filename)
+ putname(ix->filename);
+
+ kfree(ix->ctx.kname);
+ kvfree(ix->ctx.kvalue);
+}
+
+static void io_xattr_finish(struct io_kiocb *req, int ret)
+{
+ req->flags &= ~REQ_F_NEED_CLEANUP;
+
+ io_xattr_cleanup(req);
+ io_req_set_res(req, ret, 0);
+}
+
+static int __io_getxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ const char __user *name;
+ int ret;
+
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ ix->filename = NULL;
+ ix->ctx.kvalue = NULL;
+ name = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ ix->ctx.size = READ_ONCE(sqe->len);
+ ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
+
+ if (ix->ctx.flags)
+ return -EINVAL;
+
+ ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
+ if (!ix->ctx.kname)
+ return -ENOMEM;
+
+ ret = strncpy_from_user(ix->ctx.kname->name, name,
+ sizeof(ix->ctx.kname->name));
+ if (!ret || ret == sizeof(ix->ctx.kname->name))
+ ret = -ERANGE;
+ if (ret < 0) {
+ kfree(ix->ctx.kname);
+ return ret;
+ }
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_fgetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ return __io_getxattr_prep(req, sqe);
+}
+
+int io_getxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ const char __user *path;
+ int ret;
+
+ ret = __io_getxattr_prep(req, sqe);
+ if (ret)
+ return ret;
+
+ path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
+
+ ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
+ if (IS_ERR(ix->filename)) {
+ ret = PTR_ERR(ix->filename);
+ ix->filename = NULL;
+ }
+
+ return ret;
+}
+
+int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ ret = do_getxattr(mnt_idmap(req->file->f_path.mnt),
+ req->file->f_path.dentry,
+ &ix->ctx);
+
+ io_xattr_finish(req, ret);
+ return IOU_OK;
+}
+
+int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ unsigned int lookup_flags = LOOKUP_FOLLOW;
+ struct path path;
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+retry:
+ ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
+ if (!ret) {
+ ret = do_getxattr(mnt_idmap(path.mnt), path.dentry, &ix->ctx);
+
+ path_put(&path);
+ if (retry_estale(ret, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
+ }
+
+ io_xattr_finish(req, ret);
+ return IOU_OK;
+}
+
+static int __io_setxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ const char __user *name;
+ int ret;
+
+ if (unlikely(req->flags & REQ_F_FIXED_FILE))
+ return -EBADF;
+
+ ix->filename = NULL;
+ name = u64_to_user_ptr(READ_ONCE(sqe->addr));
+ ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+ ix->ctx.kvalue = NULL;
+ ix->ctx.size = READ_ONCE(sqe->len);
+ ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
+
+ ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
+ if (!ix->ctx.kname)
+ return -ENOMEM;
+
+ ret = setxattr_copy(name, &ix->ctx);
+ if (ret) {
+ kfree(ix->ctx.kname);
+ return ret;
+ }
+
+ req->flags |= REQ_F_NEED_CLEANUP;
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_setxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ const char __user *path;
+ int ret;
+
+ ret = __io_setxattr_prep(req, sqe);
+ if (ret)
+ return ret;
+
+ path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
+
+ ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL);
+ if (IS_ERR(ix->filename)) {
+ ret = PTR_ERR(ix->filename);
+ ix->filename = NULL;
+ }
+
+ return ret;
+}
+
+int io_fsetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ return __io_setxattr_prep(req, sqe);
+}
+
+static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags,
+ const struct path *path)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ int ret;
+
+ ret = mnt_want_write(path->mnt);
+ if (!ret) {
+ ret = do_setxattr(mnt_idmap(path->mnt), path->dentry, &ix->ctx);
+ mnt_drop_write(path->mnt);
+ }
+
+ return ret;
+}
+
+int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ ret = __io_setxattr(req, issue_flags, &req->file->f_path);
+ io_xattr_finish(req, ret);
+ return IOU_OK;
+}
+
+int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
+ unsigned int lookup_flags = LOOKUP_FOLLOW;
+ struct path path;
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+retry:
+ ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
+ if (!ret) {
+ ret = __io_setxattr(req, issue_flags, &path);
+ path_put(&path);
+ if (retry_estale(ret, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
+ }
+
+ io_xattr_finish(req, ret);
+ return IOU_OK;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 00:29:54 +0000