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Initial Linux implementation of uv_fs_openat

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This commit adds the initial Linux implementation of `uv_fs_openat`.
Windows support using `NtCreateFile` will come in a later commit.

fixes #4167

Signed-off-by: Yage Hu <me@huyage.dev>
This commit is contained in:
Yage Hu 2024-06-12 14:26:50 -07:00
parent ea1cf034be
commit 9d6c5eaf0e
6 changed files with 136 additions and 1 deletions
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10
include/uv.h
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@ -1429,7 +1429,8 @@ typedef enum {
UV_FS_CLOSEDIR,
UV_FS_STATFS,
UV_FS_MKSTEMP,
UV_FS_LUTIME
UV_FS_LUTIME,
UV_FS_OPENAT
} uv_fs_type;
struct uv_dir_s {
@ -1470,6 +1471,13 @@ UV_EXTERN int uv_fs_open(uv_loop_t* loop,
int flags,
int mode,
uv_fs_cb cb);
UV_EXTERN int uv_fs_openat(uv_loop_t* loop,
uv_fs_t* req,
uv_os_fd_t file,
const char* path,
int flags,
int mode,
uv_fs_cb cb);
UV_EXTERN int uv_fs_read(uv_loop_t* loop,
uv_fs_t* req,
uv_file file,

47
src/unix/fs.c
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@ -506,6 +506,34 @@ static ssize_t uv__pwritev(int fd,
return uv__preadv_or_pwritev(fd, bufs, nbufs, off, &cache, /*is_pread*/0);
}
static ssize_t uv__fs_openat(uv_fs_t* req) {
#ifdef O_CLOEXEC
return openat(req->file, req->path, req->flags | O_CLOEXEC, req->mode);
#else /* O_CLOEXEC */
int r;
if (req->cb != NULL)
uv_rwlock_rdlock(&req->loop->cloexec_lock);
r = openat(req->file, req->path, req->flags, req->mode);
/* In case of failure `uv__cloexec` will leave error in `errno`,
* so it is enough to just set `r` to `-1`.
*/
if (r >= 0 && uv__cloexec(r, 1) != 0) {
r = uv__close(r);
if (r != 0)
abort();
r = -1;
}
if (req->cb != NULL)
uv_rwlock_rdunlock(&req->loop->cloexec_lock);
return r;
#endif /* O_CLOEXEC */
}
static ssize_t uv__fs_read(uv_fs_t* req) {
const struct iovec* bufs;
@ -1714,6 +1742,7 @@ static void uv__fs_work(struct uv__work* w) {
X(MKDTEMP, uv__fs_mkdtemp(req));
X(MKSTEMP, uv__fs_mkstemp(req));
X(OPEN, uv__fs_open(req));
X(OPENAT, uv__fs_openat(req));
X(READ, uv__fs_read(req));
X(SCANDIR, uv__fs_scandir(req));
X(OPENDIR, uv__fs_opendir(req));
@ -2012,6 +2041,24 @@ int uv_fs_open(uv_loop_t* loop,
POST;
}
int uv_fs_openat(uv_loop_t* loop,
uv_fs_t* req,
uv_os_fd_t file,
const char* path,
int flags,
int mode,
uv_fs_cb cb) {
INIT(OPENAT);
PATH;
req->file = file;
req->flags = flags;
req->mode = mode;
if (cb != NULL)
if (uv__iou_fs_openat(loop, req))
return 0;
POST;
}
int uv_fs_read(uv_loop_t* loop, uv_fs_t* req,
uv_file file,

2
src/unix/internal.h
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@ -353,6 +353,7 @@ int uv__iou_fs_fsync_or_fdatasync(uv_loop_t* loop,
int uv__iou_fs_link(uv_loop_t* loop, uv_fs_t* req);
int uv__iou_fs_mkdir(uv_loop_t* loop, uv_fs_t* req);
int uv__iou_fs_open(uv_loop_t* loop, uv_fs_t* req);
int uv__iou_fs_openat(uv_loop_t* loop, uv_fs_t* req);
int uv__iou_fs_read_or_write(uv_loop_t* loop,
uv_fs_t* req,
int is_read);
@ -370,6 +371,7 @@ int uv__iou_fs_unlink(uv_loop_t* loop, uv_fs_t* req);
#define uv__iou_fs_link(loop, req) 0
#define uv__iou_fs_mkdir(loop, req) 0
#define uv__iou_fs_open(loop, req) 0
#define uv__iou_fs_openat(loop, req) 0
#define uv__iou_fs_read_or_write(loop, req, is_read) 0
#define uv__iou_fs_rename(loop, req) 0
#define uv__iou_fs_statx(loop, req, is_fstat, is_lstat) 0

22
src/unix/linux.c
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@ -979,6 +979,28 @@ int uv__iou_fs_open(uv_loop_t* loop, uv_fs_t* req) {
}
int uv__iou_fs_openat(uv_loop_t* loop, uv_fs_t* req) {
struct uv__io_uring_sqe* sqe;
struct uv__iou* iou;
iou = &uv__get_internal_fields(loop)->iou;
sqe = uv__iou_get_sqe(iou, loop, req);
if (sqe == NULL)
return 0;
sqe->addr = (uintptr_t) req->path;
sqe->fd = req->file;
sqe->len = req->mode;
sqe->opcode = UV__IORING_OP_OPENAT;
sqe->open_flags = req->flags | O_CLOEXEC;
uv__iou_submit(iou);
return 1;
}
int uv__iou_fs_rename(uv_loop_t* loop, uv_fs_t* req) {
struct uv__io_uring_sqe* sqe;
struct uv__iou* iou;

54
test/test-fs.c
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@ -3232,6 +3232,60 @@ TEST_IMPL(fs_scandir_early_exit) {
}
TEST_IMPL(fs_openat) {
uv_fs_t req;
int r;
uv_os_fd_t fd;
uv_os_fd_t dirfd;
/* Setup. */
unlink("test/fixtures/test_dir/test_file");
rmdir("test/fixtures/test_dir");
loop = uv_default_loop();
r = uv_fs_mkdir(NULL, &req, "test/fixtures/test_dir", 0755, NULL);
ASSERT_OK(r);
r = uv_fs_open(NULL,
&req,
"test/fixtures/test_dir",
UV_FS_O_RDONLY | UV_FS_O_DIRECTORY,
0,
NULL);
ASSERT_GE(r, 0);
uv_fs_req_cleanup(&req);
dirfd = (uv_os_fd_t) req.result;
r = uv_fs_openat(NULL,
&req,
dirfd,
"test_file",
UV_FS_O_RDWR | UV_FS_O_CREAT,
S_IWUSR | S_IRUSR,
NULL);
ASSERT_GE(r, 0);
uv_fs_req_cleanup(&req);
fd = (uv_os_fd_t) req.result;
r = uv_fs_close(NULL, &req, dirfd, NULL);
ASSERT_OK(r);
uv_fs_req_cleanup(&req);
r = uv_fs_close(NULL, &req, fd, NULL);
ASSERT_OK(r);
uv_fs_req_cleanup(&req);
/* Cleanup */
unlink("test/fixtures/test_dir/test_file");
rmdir("test/fixtures/test_dir");
MAKE_VALGRIND_HAPPY(loop);
return 0;
}
TEST_IMPL(fs_open_dir) {
const char* path;
uv_fs_t req;

2
test/test-list.h
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@ -425,6 +425,7 @@ TEST_DECLARE (fs_scandir_empty_dir)
TEST_DECLARE (fs_scandir_non_existent_dir)
TEST_DECLARE (fs_scandir_file)
TEST_DECLARE (fs_scandir_early_exit)
TEST_DECLARE (fs_openat)
TEST_DECLARE (fs_open_dir)
TEST_DECLARE (fs_readdir_empty_dir)
TEST_DECLARE (fs_readdir_file)
@ -1146,6 +1147,7 @@ TASK_LIST_START
TEST_ENTRY (fs_scandir_non_existent_dir)
TEST_ENTRY (fs_scandir_file)
TEST_ENTRY (fs_scandir_early_exit)
TEST_ENTRY (fs_openat)
TEST_ENTRY (fs_open_dir)
TEST_ENTRY (fs_readdir_empty_dir)
TEST_ENTRY (fs_readdir_file)