From: Stefan Roesch <[email protected]>
To: <[email protected]>, <[email protected]>,
<[email protected]>
Cc: <[email protected]>, <[email protected]>,
<[email protected]>
Subject: [PATCH v12 4/4] io_uring: add fgetxattr and getxattr support
Date: Wed, 5 Jan 2022 14:18:30 -0800 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
This adds support to io_uring for the fgetxattr and getxattr API.
Signed-off-by: Stefan Roesch <[email protected]>
---
fs/io_uring.c | 129 ++++++++++++++++++++++++++++++++++
include/uapi/linux/io_uring.h | 2 +
2 files changed, 131 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index a724e37410d7..0bbd46a813b5 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1117,6 +1117,10 @@ static const struct io_op_def io_op_defs[] = {
.needs_file = 1
},
[IORING_OP_SETXATTR] = {},
+ [IORING_OP_FGETXATTR] = {
+ .needs_file = 1
+ },
+ [IORING_OP_GETXATTR] = {},
};
/* requests with any of those set should undergo io_disarm_next() */
@@ -3878,6 +3882,119 @@ static void io_xattr_finish(struct io_kiocb *req, int ret)
io_req_complete(req, ret);
}
+static int __io_getxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = &req->xattr;
+ const char __user *name;
+ int ret;
+
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+ return -EINVAL;
+ if (unlikely(sqe->ioprio))
+ return -EINVAL;
+ 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;
+ return 0;
+}
+
+static int io_fgetxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ return __io_getxattr_prep(req, sqe);
+}
+
+static int io_getxattr_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
+{
+ struct io_xattr *ix = &req->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;
+}
+
+static int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = &req->xattr;
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ return -EAGAIN;
+
+ ret = do_getxattr(mnt_user_ns(req->file->f_path.mnt),
+ req->file->f_path.dentry,
+ &ix->ctx);
+
+ io_xattr_finish(req, ret);
+ return 0;
+}
+
+static int io_getxattr(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_xattr *ix = &req->xattr;
+ unsigned int lookup_flags = LOOKUP_FOLLOW;
+ struct path path;
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ return -EAGAIN;
+
+retry:
+ ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL);
+ if (!ret) {
+ ret = do_getxattr(mnt_user_ns(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 0;
+}
+
static int __io_setxattr_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@@ -6618,6 +6735,10 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return io_fsetxattr_prep(req, sqe);
case IORING_OP_SETXATTR:
return io_setxattr_prep(req, sqe);
+ case IORING_OP_FGETXATTR:
+ return io_fgetxattr_prep(req, sqe);
+ case IORING_OP_GETXATTR:
+ return io_getxattr_prep(req, sqe);
}
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
@@ -6761,6 +6882,8 @@ static void io_clean_op(struct io_kiocb *req)
break;
case IORING_OP_SETXATTR:
case IORING_OP_FSETXATTR:
+ case IORING_OP_GETXATTR:
+ case IORING_OP_FGETXATTR:
__io_xattr_finish(req);
break;
}
@@ -6911,6 +7034,12 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
case IORING_OP_SETXATTR:
ret = io_setxattr(req, issue_flags);
break;
+ case IORING_OP_FGETXATTR:
+ ret = io_fgetxattr(req, issue_flags);
+ break;
+ case IORING_OP_GETXATTR:
+ ret = io_getxattr(req, issue_flags);
+ break;
default:
ret = -EINVAL;
break;
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index dbf473900da2..9c6e617d3187 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -147,6 +147,8 @@ enum {
IORING_OP_LINKAT,
IORING_OP_FSETXATTR,
IORING_OP_SETXATTR,
+ IORING_OP_FGETXATTR,
+ IORING_OP_GETXATTR,
/* this goes last, obviously */
IORING_OP_LAST,
--
2.30.2
next prev parent reply other threads:[~2022-01-05 22:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-05 22:18 [PATCH v12 0/4] io_uring: add xattr support Stefan Roesch
2022-01-05 22:18 ` [PATCH v12 1/4] fs: split off setxattr_copy and do_setxattr function from setxattr Stefan Roesch
2022-01-05 22:18 ` [PATCH v12 2/4] fs: split off do_getxattr from getxattr Stefan Roesch
2022-01-05 22:18 ` [PATCH v12 3/4] io_uring: add fsetxattr and setxattr support Stefan Roesch
2022-01-05 22:18 ` Stefan Roesch [this message]
2022-01-06 13:20 ` [PATCH v12 0/4] io_uring: add xattr support Christian Brauner
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