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io_uring: add support for IORING_OP_SYMLINKAT

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IORING_OP_SYMLINKAT behaves like symlinkat(2) and takes the same flags
and arguments.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Suggested-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/io-uring/20210514145259.wtl4xcsp52woi6ab@wittgenstein/
Signed-off-by: Dmitry Kadashev <dkadashev@gmail.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20210708063447.3556403-11-dkadashev@gmail.com
[axboe: add splice_fd_in check]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dmitry Kadashev 2021-07-08 13:34:46 +07:00 committed by Jens Axboe
parent e34a02dc40
commit 7a8721f84f
4 changed files with 70 additions and 2 deletions
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1
fs/internal.h
View File

@ -77,6 +77,7 @@ int may_linkat(struct user_namespace *mnt_userns, struct path *link);
int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
struct filename *newname, unsigned int flags);
int do_mkdirat(int dfd, struct filename *name, umode_t mode);
int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
/*
* namespace.c

67
fs/io_uring.c
View File

@ -669,6 +669,13 @@ struct io_mkdir {
struct filename *filename;
};
struct io_symlink {
struct file *file;
int new_dfd;
struct filename *oldpath;
struct filename *newpath;
};
struct io_completion {
struct file *file;
u32 cflags;
@ -829,6 +836,7 @@ struct io_kiocb {
struct io_rename rename;
struct io_unlink unlink;
struct io_mkdir mkdir;
struct io_symlink symlink;
/* use only after cleaning per-op data, see io_clean_op() */
struct io_completion compl;
};
@ -1041,6 +1049,7 @@ static const struct io_op_def io_op_defs[] = {
[IORING_OP_RENAMEAT] = {},
[IORING_OP_UNLINKAT] = {},
[IORING_OP_MKDIRAT] = {},
[IORING_OP_SYMLINKAT] = {},
};
/* requests with any of those set should undergo io_disarm_next() */
@ -3655,6 +3664,55 @@ static int io_mkdirat(struct io_kiocb *req, int issue_flags)
return 0;
}
static int io_symlinkat_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
struct io_symlink *sl = &req->symlink;
const char __user *oldpath, *newpath;
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (sqe->ioprio || 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;
return 0;
}
static int io_symlinkat(struct io_kiocb *req, int issue_flags)
{
struct io_symlink *sl = &req->symlink;
int ret;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
req->flags &= ~REQ_F_NEED_CLEANUP;
if (ret < 0)
req_set_fail(req);
io_req_complete(req, ret);
return 0;
}
static int io_shutdown_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@ -6054,6 +6112,8 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return io_unlinkat_prep(req, sqe);
case IORING_OP_MKDIRAT:
return io_mkdirat_prep(req, sqe);
case IORING_OP_SYMLINKAT:
return io_symlinkat_prep(req, sqe);
}
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
@ -6220,6 +6280,10 @@ static void io_clean_op(struct io_kiocb *req)
case IORING_OP_MKDIRAT:
putname(req->mkdir.filename);
break;
case IORING_OP_SYMLINKAT:
putname(req->symlink.oldpath);
putname(req->symlink.newpath);
break;
}
}
if ((req->flags & REQ_F_POLLED) && req->apoll) {
@ -6351,6 +6415,9 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
case IORING_OP_MKDIRAT:
ret = io_mkdirat(req, issue_flags);
break;
case IORING_OP_SYMLINKAT:
ret = io_symlinkat(req, issue_flags);
break;
default:
ret = -EINVAL;
break;

3
fs/namei.c
View File

@ -4223,8 +4223,7 @@ int vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
}
EXPORT_SYMBOL(vfs_symlink);
static int do_symlinkat(struct filename *from, int newdfd,
struct filename *to)
int do_symlinkat(struct filename *from, int newdfd, struct filename *to)
{
int error;
struct dentry *dentry;

1
include/uapi/linux/io_uring.h
View File

@ -134,6 +134,7 @@ enum {
IORING_OP_RENAMEAT,
IORING_OP_UNLINKAT,
IORING_OP_MKDIRAT,
IORING_OP_SYMLINKAT,
/* this goes last, obviously */
IORING_OP_LAST,