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0158005aaa
similar to do_setxattr() in the previous commit... Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
208 lines
4.6 KiB
C
208 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/io_uring.h>
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#include <linux/xattr.h>
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#include <uapi/linux/io_uring.h>
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#include "../fs/internal.h"
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#include "io_uring.h"
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#include "xattr.h"
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struct io_xattr {
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struct file *file;
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struct kernel_xattr_ctx ctx;
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struct filename *filename;
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};
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void io_xattr_cleanup(struct io_kiocb *req)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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if (ix->filename)
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putname(ix->filename);
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kfree(ix->ctx.kname);
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kvfree(ix->ctx.kvalue);
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}
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static void io_xattr_finish(struct io_kiocb *req, int ret)
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{
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req->flags &= ~REQ_F_NEED_CLEANUP;
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io_xattr_cleanup(req);
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io_req_set_res(req, ret, 0);
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}
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static int __io_getxattr_prep(struct io_kiocb *req,
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const struct io_uring_sqe *sqe)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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const char __user *name;
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int ret;
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ix->filename = NULL;
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ix->ctx.kvalue = NULL;
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name = u64_to_user_ptr(READ_ONCE(sqe->addr));
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ix->ctx.value = u64_to_user_ptr(READ_ONCE(sqe->addr2));
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ix->ctx.size = READ_ONCE(sqe->len);
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ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
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if (ix->ctx.flags)
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return -EINVAL;
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ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
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if (!ix->ctx.kname)
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return -ENOMEM;
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ret = import_xattr_name(ix->ctx.kname, name);
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if (ret) {
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kfree(ix->ctx.kname);
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return ret;
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}
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req->flags |= REQ_F_NEED_CLEANUP;
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req->flags |= REQ_F_FORCE_ASYNC;
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return 0;
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}
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int io_fgetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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return __io_getxattr_prep(req, sqe);
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}
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int io_getxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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const char __user *path;
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int ret;
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if (unlikely(req->flags & REQ_F_FIXED_FILE))
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return -EBADF;
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ret = __io_getxattr_prep(req, sqe);
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if (ret)
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return ret;
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path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
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ix->filename = getname(path);
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if (IS_ERR(ix->filename))
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return PTR_ERR(ix->filename);
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return 0;
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}
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int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = file_getxattr(req->file, &ix->ctx);
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io_xattr_finish(req, ret);
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return IOU_OK;
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}
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int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = filename_getxattr(AT_FDCWD, ix->filename, LOOKUP_FOLLOW, &ix->ctx);
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ix->filename = NULL;
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io_xattr_finish(req, ret);
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return IOU_OK;
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}
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static int __io_setxattr_prep(struct io_kiocb *req,
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const struct io_uring_sqe *sqe)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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const char __user *name;
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int ret;
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ix->filename = NULL;
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name = u64_to_user_ptr(READ_ONCE(sqe->addr));
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ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2));
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ix->ctx.kvalue = NULL;
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ix->ctx.size = READ_ONCE(sqe->len);
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ix->ctx.flags = READ_ONCE(sqe->xattr_flags);
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ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL);
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if (!ix->ctx.kname)
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return -ENOMEM;
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ret = setxattr_copy(name, &ix->ctx);
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if (ret) {
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kfree(ix->ctx.kname);
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return ret;
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}
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req->flags |= REQ_F_NEED_CLEANUP;
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req->flags |= REQ_F_FORCE_ASYNC;
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return 0;
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}
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int io_setxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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const char __user *path;
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int ret;
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if (unlikely(req->flags & REQ_F_FIXED_FILE))
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return -EBADF;
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ret = __io_setxattr_prep(req, sqe);
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if (ret)
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return ret;
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path = u64_to_user_ptr(READ_ONCE(sqe->addr3));
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ix->filename = getname(path);
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if (IS_ERR(ix->filename))
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return PTR_ERR(ix->filename);
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return 0;
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}
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int io_fsetxattr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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return __io_setxattr_prep(req, sqe);
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}
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int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = file_setxattr(req->file, &ix->ctx);
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io_xattr_finish(req, ret);
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return IOU_OK;
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}
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int io_setxattr(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_xattr *ix = io_kiocb_to_cmd(req, struct io_xattr);
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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ret = filename_setxattr(AT_FDCWD, ix->filename, LOOKUP_FOLLOW, &ix->ctx);
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ix->filename = NULL;
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io_xattr_finish(req, ret);
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return IOU_OK;
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}
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