Tests for file_getattr()/file_setattr() and xfsprogs update

Tests for file_getattr()/file_setattr() and xfsprogs update

[Andrey Albershteyn]

Hi all,

This two patchsets are update to xfsprogs to utilize recently added
file_getattr() and file_setattr() syscalls.

The second patchset adds two tests to fstests, one generic one on
these syscals and second one is for XFS's original usecase for these
syscalls (projects quotas).

-- 
- Andrey

[PATCH v3 0/3] Test file_getattr and file_setattr syscalls

[Andrey Albershteyn]

Add a test to check basic functionallity of file_getattr() and
file_setattr() syscalls. These syscalls are used to get/set filesystem
inode attributes (think of FS_IOC_SETFSXATTR ioctl()). The difference
from ioctl() is that these syscalls use *at() semantics and can be
called on any file without opening it, including special ones.

For XFS, with the use of these syscalls, xfs_quota now can
manipulate quota on special files such as sockets. Add a test to
check that special files are counted, which wasn't true before.

To: fstests@vger.kernel.org
Cc: zlang@redhat.com
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-xfs@vger.kernel.org

Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
---
Changes in v3:
- Fix tab vs spaces indents
- Update year in SPDX header
- Rename AC_HAVE_FILE_ATTR to AC_HAVE_FILE_GETATTR

Changes in v2:
- Improve help message for file_attr
- Refactor file_attr.c
- Drop _wants_*_commit
- Link to v1: https://lore.kernel.org/r/20250808-xattrat-syscall-v1-0-6a09c4f37f10@kernel.org

---
Andrey Albershteyn (3):
      file_attr: introduce program to set/get fsxattr
      generic: introduce test to test file_getattr/file_setattr syscalls
      xfs: test quota's project ID on special files

 .gitignore             |   1 +
 configure.ac           |   1 +
 include/builddefs.in   |   1 +
 m4/package_libcdev.m4  |  16 +++
 src/Makefile           |   5 +
 src/file_attr.c        | 274 +++++++++++++++++++++++++++++++++++++++++++++++++
 tests/generic/2000     | 109 ++++++++++++++++++++
 tests/generic/2000.out |  37 +++++++
 tests/xfs/2000         |  73 +++++++++++++
 tests/xfs/2000.out     |  15 +++
 10 files changed, 532 insertions(+)
---
base-commit: 3d57f543ae0c149eb460574dcfb8d688aeadbfff
change-id: 20250317-xattrat-syscall-ee8f5e2d6e18

Best regards,
--  
Andrey Albershteyn <aalbersh@kernel.org>

[PATCH v3 1/3] file_attr: introduce program to set/get fsxattr

[Andrey Albershteyn]

This programs uses newly introduced file_getattr and file_setattr
syscalls. This program is partially a test of invalid options. This will
be used further in the test.

Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
---
 .gitignore            |   1 +
 configure.ac          |   1 +
 include/builddefs.in  |   1 +
 m4/package_libcdev.m4 |  16 +++
 src/Makefile          |   5 +
 src/file_attr.c       | 274 ++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 298 insertions(+)

diff --git a/.gitignore b/.gitignore
index 6948fd602f95..82c57f415301 100644
--- a/.gitignore
+++ b/.gitignore
@@ -211,6 +211,7 @@ tags
 /src/min_dio_alignment
 /src/dio-writeback-race
 /src/unlink-fsync
+/src/file_attr
 
 # Symlinked files
 /tests/generic/035.out
diff --git a/configure.ac b/configure.ac
index f3c8c643f0eb..f7519fa97654 100644
--- a/configure.ac
+++ b/configure.ac
@@ -73,6 +73,7 @@ AC_HAVE_RLIMIT_NOFILE
 AC_NEED_INTERNAL_XFS_IOC_EXCHANGE_RANGE
 AC_HAVE_FICLONE
 AC_HAVE_TRIVIAL_AUTO_VAR_INIT
+AC_HAVE_FILE_GETATTR
 
 AC_CHECK_FUNCS([renameat2])
 AC_CHECK_FUNCS([reallocarray])
diff --git a/include/builddefs.in b/include/builddefs.in
index 96d5ed25b3e2..708d75b24d76 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -74,6 +74,7 @@ HAVE_BMV_OF_SHARED = @have_bmv_of_shared@
 HAVE_RLIMIT_NOFILE = @have_rlimit_nofile@
 NEED_INTERNAL_XFS_IOC_EXCHANGE_RANGE = @need_internal_xfs_ioc_exchange_range@
 HAVE_FICLONE = @have_ficlone@
+HAVE_FILE_GETATTR = @have_file_getattr@
 
 GCCFLAGS = -std=gnu11 -funsigned-char -fno-strict-aliasing -Wall
 SANITIZER_CFLAGS += @autovar_init_cflags@
diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4
index ed8fe6e32ae0..17f57f427410 100644
--- a/m4/package_libcdev.m4
+++ b/m4/package_libcdev.m4
@@ -86,3 +86,19 @@ AC_DEFUN([AC_HAVE_TRIVIAL_AUTO_VAR_INIT],
     CFLAGS="${OLD_CFLAGS}"
     AC_SUBST(autovar_init_cflags)
   ])
+
+#
+# Check if we have a file_getattr system call (Linux)
+#
+AC_DEFUN([AC_HAVE_FILE_GETATTR],
+  [ AC_MSG_CHECKING([for file_getattr syscall])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#define _GNU_SOURCE
+#include <sys/syscall.h>
+#include <unistd.h>
+    ]], [[
+         syscall(__NR_file_getattr, 0, 0, 0, 0, 0, 0);
+    ]])],[have_file_getattr=yes
+       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
+    AC_SUBST(have_file_getattr)
+  ])
diff --git a/src/Makefile b/src/Makefile
index 7080e34896c3..711dbb917b3a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -62,6 +62,11 @@ ifeq ($(HAVE_FALLOCATE), true)
 LCFLAGS += -DHAVE_FALLOCATE
 endif
 
+ifeq ($(HAVE_FILE_GETATTR), yes)
+LINUX_TARGETS += file_attr
+LCFLAGS += -DHAVE_FILE_GETATTR
+endif
+
 ifeq ($(PKG_PLATFORM),linux)
 TARGETS += $(LINUX_TARGETS)
 endif
diff --git a/src/file_attr.c b/src/file_attr.c
new file mode 100644
index 000000000000..29bb6c903403
--- /dev/null
+++ b/src/file_attr.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2025 Red Hat, Inc.  All Rights Reserved.
+ */
+
+#include "global.h"
+#include <sys/syscall.h>
+#include <getopt.h>
+#include <errno.h>
+#include <linux/fs.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#ifndef HAVE_FILE_GETATTR
+#define __NR_file_getattr 468
+#define __NR_file_setattr 469
+
+struct file_attr {
+	__u32	fa_xflags;	/* xflags field value (get/set) */
+	__u32	fa_extsize;	/* extsize field value (get/set)*/
+	__u32	fa_nextents;	/* nextents field value (get)   */
+	__u32	fa_projid;	/* project identifier (get/set) */
+	__u32	fa_cowextsize;	/* CoW extsize field value (get/set) */
+};
+
+#endif
+
+#define SPECIAL_FILE(x) \
+	   (S_ISCHR((x)) \
+	|| S_ISBLK((x)) \
+	|| S_ISFIFO((x)) \
+	|| S_ISLNK((x)) \
+	|| S_ISSOCK((x)))
+
+static struct option long_options[] = {
+	{"set",			no_argument,	0,	's' },
+	{"get",			no_argument,	0,	'g' },
+	{"no-follow",		no_argument,	0,	'n' },
+	{"at-cwd",		no_argument,	0,	'a' },
+	{"set-nodump",		no_argument,	0,	'd' },
+	{"invalid-at",		no_argument,	0,	'i' },
+	{"too-big-arg",		no_argument,	0,	'b' },
+	{"too-small-arg",	no_argument,	0,	'm' },
+	{"new-fsx-flag",	no_argument,	0,	'x' },
+	{0,			0,		0,	0 }
+};
+
+static struct xflags {
+	uint	flag;
+	char	*shortname;
+	char	*longname;
+} xflags[] = {
+	{ FS_XFLAG_REALTIME,		"r", "realtime"		},
+	{ FS_XFLAG_PREALLOC,		"p", "prealloc"		},
+	{ FS_XFLAG_IMMUTABLE,		"i", "immutable"	},
+	{ FS_XFLAG_APPEND,		"a", "append-only"	},
+	{ FS_XFLAG_SYNC,		"s", "sync"		},
+	{ FS_XFLAG_NOATIME,		"A", "no-atime"		},
+	{ FS_XFLAG_NODUMP,		"d", "no-dump"		},
+	{ FS_XFLAG_RTINHERIT,		"t", "rt-inherit"	},
+	{ FS_XFLAG_PROJINHERIT,		"P", "proj-inherit"	},
+	{ FS_XFLAG_NOSYMLINKS,		"n", "nosymlinks"	},
+	{ FS_XFLAG_EXTSIZE,		"e", "extsize"		},
+	{ FS_XFLAG_EXTSZINHERIT,	"E", "extsz-inherit"	},
+	{ FS_XFLAG_NODEFRAG,		"f", "no-defrag"	},
+	{ FS_XFLAG_FILESTREAM,		"S", "filestream"	},
+	{ FS_XFLAG_DAX,			"x", "dax"		},
+	{ FS_XFLAG_COWEXTSIZE,		"C", "cowextsize"	},
+	{ FS_XFLAG_HASATTR,		"X", "has-xattr"	},
+	{ 0, NULL, NULL }
+};
+
+static int
+file_getattr(
+		int			dfd,
+		const char		*filename,
+		struct file_attr	*fsx,
+		size_t			usize,
+		unsigned int		at_flags)
+{
+	return syscall(__NR_file_getattr, dfd, filename, fsx, usize, at_flags);
+}
+
+static int
+file_setattr(
+		int			dfd,
+		const char		*filename,
+		struct file_attr	*fsx,
+		size_t			usize,
+		unsigned int		at_flags)
+{
+	return syscall(__NR_file_setattr, dfd, filename, fsx, usize, at_flags);
+}
+
+static void
+print_xflags(
+	uint		flags,
+	int		verbose,
+	int		dofname,
+	const char	*fname,
+	int		dobraces,
+	int		doeol)
+{
+	struct xflags	*p;
+	int		first = 1;
+
+	if (dobraces)
+		fputs("[", stdout);
+	for (p = xflags; p->flag; p++) {
+		if (flags & p->flag) {
+			if (verbose) {
+				if (first)
+					first = 0;
+				else
+					fputs(", ", stdout);
+				fputs(p->longname, stdout);
+			} else {
+				fputs(p->shortname, stdout);
+			}
+		} else if (!verbose) {
+			fputs("-", stdout);
+		}
+	}
+	if (dobraces)
+		fputs("]", stdout);
+	if (dofname)
+		printf(" %s ", fname);
+	if (doeol)
+		fputs("\n", stdout);
+}
+
+int main(int argc, char *argv[])
+{
+	int error;
+	int c;
+	const char *path = NULL;
+	const char *path1 = NULL;
+	const char *path2 = NULL;
+	unsigned int at_flags = 0;
+	unsigned int fa_xflags = 0;
+	int action = 0; /* 0 get; 1 set */
+	struct file_attr fsx = { };
+	int fa_size = sizeof(struct file_attr);
+	struct stat status;
+	int fd;
+	int at_fdcwd = 0;
+	int unknwon_fa_flag = 0;
+
+	while (1) {
+		int option_index = 0;
+
+		c = getopt_long_only(argc, argv, "", long_options,
+				&option_index);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 's':
+			action = 1;
+			break;
+		case 'g':
+			action = 0;
+			break;
+		case 'n':
+			at_flags |= AT_SYMLINK_NOFOLLOW;
+			break;
+		case 'a':
+			at_fdcwd = 1;
+			break;
+		case 'd':
+			fa_xflags |= FS_XFLAG_NODUMP;
+			break;
+		case 'i':
+			at_flags |= (1 << 25);
+			break;
+		case 'b':
+			fa_size = getpagesize() + 1; /* max size if page size */
+			break;
+		case 'm':
+			fa_size = 19; /* VER0 size of fsxattr is 20 */
+			break;
+		case 'x':
+			unknwon_fa_flag = (1 << 27);
+			break;
+		default:
+			goto usage;
+		}
+	}
+
+	if (!path1 && optind < argc)
+		path1 = argv[optind++];
+	if (!path2 && optind < argc)
+		path2 = argv[optind++];
+
+	if (at_fdcwd) {
+		fd = AT_FDCWD;
+		path = path1;
+	} else if (!path2) {
+		error = stat(path1, &status);
+		if (error) {
+			fprintf(stderr,
+"Can not get file status of %s: %s\n", path1, strerror(errno));
+			return error;
+		}
+
+		if (SPECIAL_FILE(status.st_mode)) {
+			fprintf(stderr,
+"Can not open special file %s without parent dir: %s\n", path1, strerror(errno));
+			return errno;
+		}
+
+		fd = open(path1, O_RDONLY);
+		if (fd == -1) {
+			fprintf(stderr, "Can not open %s: %s\n", path1,
+					strerror(errno));
+			return errno;
+		}
+	} else {
+		fd = open(path1, O_RDONLY);
+		if (fd == -1) {
+			fprintf(stderr, "Can not open %s: %s\n", path1,
+					strerror(errno));
+			return errno;
+		}
+		path = path2;
+	}
+
+	if (!path)
+		at_flags |= AT_EMPTY_PATH;
+
+	error = file_getattr(fd, path, &fsx, fa_size,
+			at_flags);
+	if (error) {
+		fprintf(stderr, "Can not get fsxattr on %s: %s\n", path,
+				strerror(errno));
+		return error;
+	}
+	if (action) {
+		fsx.fa_xflags |= (fa_xflags | unknwon_fa_flag);
+
+		error = file_setattr(fd, path, &fsx, fa_size,
+				at_flags);
+		if (error) {
+			fprintf(stderr, "Can not set fsxattr on %s: %s\n", path,
+					strerror(errno));
+			return error;
+		}
+	} else {
+		if (path2)
+			print_xflags(fsx.fa_xflags, 0, 1, path, 0, 1);
+		else
+			print_xflags(fsx.fa_xflags, 0, 1, path1, 0, 1);
+	}
+
+	return error;
+
+usage:
+	printf("Usage: %s [options]\n", argv[0]);
+	printf("Options:\n");
+	printf("\t--get, -g\t\tget filesystem inode attributes\n");
+	printf("\t--set, -s\t\tset filesystem inode attributes\n");
+	printf("\t--at-cwd, -a\t\topen file at current working directory\n");
+	printf("\t--no-follow, -n\t\tdon't follow symlinks\n");
+	printf("\t--set-nodump, -d\t\tset FS_XFLAG_NODUMP on an inode\n");
+	printf("\t--invalid-at, -i\t\tUse invalid AT_* flag\n");
+	printf("\t--too-big-arg, -b\t\tSet fsxattr size bigger than PAGE_SIZE\n");
+	printf("\t--too-small-arg, -m\t\tSet fsxattr size to 19 bytes\n");
+	printf("\t--new-fsx-flag, -x\t\tUse unknown fa_flags flag\n");
+
+	return 1;
+}

-- 
2.50.1

Re: [PATCH v3 1/3] file_attr: introduce program to set/get fsxattr

[Darrick J. Wong]

On Tue, Sep 09, 2025 at 05:25:56PM +0200, Andrey Albershteyn wrote:
> This programs uses newly introduced file_getattr and file_setattr
> syscalls. This program is partially a test of invalid options. This will
> be used further in the test.
> 
> Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>

Thanks for cleaning up the indentation.
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> ---
>  .gitignore            |   1 +
>  configure.ac          |   1 +
>  include/builddefs.in  |   1 +
>  m4/package_libcdev.m4 |  16 +++
>  src/Makefile          |   5 +
>  src/file_attr.c       | 274 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  6 files changed, 298 insertions(+)
> 
> diff --git a/.gitignore b/.gitignore
> index 6948fd602f95..82c57f415301 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -211,6 +211,7 @@ tags
>  /src/min_dio_alignment
>  /src/dio-writeback-race
>  /src/unlink-fsync
> +/src/file_attr
>  
>  # Symlinked files
>  /tests/generic/035.out
> diff --git a/configure.ac b/configure.ac
> index f3c8c643f0eb..f7519fa97654 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -73,6 +73,7 @@ AC_HAVE_RLIMIT_NOFILE
>  AC_NEED_INTERNAL_XFS_IOC_EXCHANGE_RANGE
>  AC_HAVE_FICLONE
>  AC_HAVE_TRIVIAL_AUTO_VAR_INIT
> +AC_HAVE_FILE_GETATTR
>  
>  AC_CHECK_FUNCS([renameat2])
>  AC_CHECK_FUNCS([reallocarray])
> diff --git a/include/builddefs.in b/include/builddefs.in
> index 96d5ed25b3e2..708d75b24d76 100644
> --- a/include/builddefs.in
> +++ b/include/builddefs.in
> @@ -74,6 +74,7 @@ HAVE_BMV_OF_SHARED = @have_bmv_of_shared@
>  HAVE_RLIMIT_NOFILE = @have_rlimit_nofile@
>  NEED_INTERNAL_XFS_IOC_EXCHANGE_RANGE = @need_internal_xfs_ioc_exchange_range@
>  HAVE_FICLONE = @have_ficlone@
> +HAVE_FILE_GETATTR = @have_file_getattr@
>  
>  GCCFLAGS = -std=gnu11 -funsigned-char -fno-strict-aliasing -Wall
>  SANITIZER_CFLAGS += @autovar_init_cflags@
> diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4
> index ed8fe6e32ae0..17f57f427410 100644
> --- a/m4/package_libcdev.m4
> +++ b/m4/package_libcdev.m4
> @@ -86,3 +86,19 @@ AC_DEFUN([AC_HAVE_TRIVIAL_AUTO_VAR_INIT],
>      CFLAGS="${OLD_CFLAGS}"
>      AC_SUBST(autovar_init_cflags)
>    ])
> +
> +#
> +# Check if we have a file_getattr system call (Linux)
> +#
> +AC_DEFUN([AC_HAVE_FILE_GETATTR],
> +  [ AC_MSG_CHECKING([for file_getattr syscall])
> +    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
> +#define _GNU_SOURCE
> +#include <sys/syscall.h>
> +#include <unistd.h>
> +    ]], [[
> +         syscall(__NR_file_getattr, 0, 0, 0, 0, 0, 0);
> +    ]])],[have_file_getattr=yes
> +       AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)])
> +    AC_SUBST(have_file_getattr)
> +  ])
> diff --git a/src/Makefile b/src/Makefile
> index 7080e34896c3..711dbb917b3a 100644
> --- a/src/Makefile
> +++ b/src/Makefile
> @@ -62,6 +62,11 @@ ifeq ($(HAVE_FALLOCATE), true)
>  LCFLAGS += -DHAVE_FALLOCATE
>  endif
>  
> +ifeq ($(HAVE_FILE_GETATTR), yes)
> +LINUX_TARGETS += file_attr
> +LCFLAGS += -DHAVE_FILE_GETATTR
> +endif
> +
>  ifeq ($(PKG_PLATFORM),linux)
>  TARGETS += $(LINUX_TARGETS)
>  endif
> diff --git a/src/file_attr.c b/src/file_attr.c
> new file mode 100644
> index 000000000000..29bb6c903403
> --- /dev/null
> +++ b/src/file_attr.c
> @@ -0,0 +1,274 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2025 Red Hat, Inc.  All Rights Reserved.
> + */
> +
> +#include "global.h"
> +#include <sys/syscall.h>
> +#include <getopt.h>
> +#include <errno.h>
> +#include <linux/fs.h>
> +#include <sys/stat.h>
> +#include <string.h>
> +#include <getopt.h>
> +#include <stdlib.h>
> +#include <unistd.h>
> +
> +#ifndef HAVE_FILE_GETATTR
> +#define __NR_file_getattr 468
> +#define __NR_file_setattr 469
> +
> +struct file_attr {
> +	__u32	fa_xflags;	/* xflags field value (get/set) */
> +	__u32	fa_extsize;	/* extsize field value (get/set)*/
> +	__u32	fa_nextents;	/* nextents field value (get)   */
> +	__u32	fa_projid;	/* project identifier (get/set) */
> +	__u32	fa_cowextsize;	/* CoW extsize field value (get/set) */
> +};
> +
> +#endif
> +
> +#define SPECIAL_FILE(x) \
> +	   (S_ISCHR((x)) \
> +	|| S_ISBLK((x)) \
> +	|| S_ISFIFO((x)) \
> +	|| S_ISLNK((x)) \
> +	|| S_ISSOCK((x)))
> +
> +static struct option long_options[] = {
> +	{"set",			no_argument,	0,	's' },
> +	{"get",			no_argument,	0,	'g' },
> +	{"no-follow",		no_argument,	0,	'n' },
> +	{"at-cwd",		no_argument,	0,	'a' },
> +	{"set-nodump",		no_argument,	0,	'd' },
> +	{"invalid-at",		no_argument,	0,	'i' },
> +	{"too-big-arg",		no_argument,	0,	'b' },
> +	{"too-small-arg",	no_argument,	0,	'm' },
> +	{"new-fsx-flag",	no_argument,	0,	'x' },
> +	{0,			0,		0,	0 }
> +};
> +
> +static struct xflags {
> +	uint	flag;
> +	char	*shortname;
> +	char	*longname;
> +} xflags[] = {
> +	{ FS_XFLAG_REALTIME,		"r", "realtime"		},
> +	{ FS_XFLAG_PREALLOC,		"p", "prealloc"		},
> +	{ FS_XFLAG_IMMUTABLE,		"i", "immutable"	},
> +	{ FS_XFLAG_APPEND,		"a", "append-only"	},
> +	{ FS_XFLAG_SYNC,		"s", "sync"		},
> +	{ FS_XFLAG_NOATIME,		"A", "no-atime"		},
> +	{ FS_XFLAG_NODUMP,		"d", "no-dump"		},
> +	{ FS_XFLAG_RTINHERIT,		"t", "rt-inherit"	},
> +	{ FS_XFLAG_PROJINHERIT,		"P", "proj-inherit"	},
> +	{ FS_XFLAG_NOSYMLINKS,		"n", "nosymlinks"	},
> +	{ FS_XFLAG_EXTSIZE,		"e", "extsize"		},
> +	{ FS_XFLAG_EXTSZINHERIT,	"E", "extsz-inherit"	},
> +	{ FS_XFLAG_NODEFRAG,		"f", "no-defrag"	},
> +	{ FS_XFLAG_FILESTREAM,		"S", "filestream"	},
> +	{ FS_XFLAG_DAX,			"x", "dax"		},
> +	{ FS_XFLAG_COWEXTSIZE,		"C", "cowextsize"	},
> +	{ FS_XFLAG_HASATTR,		"X", "has-xattr"	},
> +	{ 0, NULL, NULL }
> +};
> +
> +static int
> +file_getattr(
> +		int			dfd,
> +		const char		*filename,
> +		struct file_attr	*fsx,
> +		size_t			usize,
> +		unsigned int		at_flags)
> +{
> +	return syscall(__NR_file_getattr, dfd, filename, fsx, usize, at_flags);
> +}
> +
> +static int
> +file_setattr(
> +		int			dfd,
> +		const char		*filename,
> +		struct file_attr	*fsx,
> +		size_t			usize,
> +		unsigned int		at_flags)
> +{
> +	return syscall(__NR_file_setattr, dfd, filename, fsx, usize, at_flags);
> +}
> +
> +static void
> +print_xflags(
> +	uint		flags,
> +	int		verbose,
> +	int		dofname,
> +	const char	*fname,
> +	int		dobraces,
> +	int		doeol)
> +{
> +	struct xflags	*p;
> +	int		first = 1;
> +
> +	if (dobraces)
> +		fputs("[", stdout);
> +	for (p = xflags; p->flag; p++) {
> +		if (flags & p->flag) {
> +			if (verbose) {
> +				if (first)
> +					first = 0;
> +				else
> +					fputs(", ", stdout);
> +				fputs(p->longname, stdout);
> +			} else {
> +				fputs(p->shortname, stdout);
> +			}
> +		} else if (!verbose) {
> +			fputs("-", stdout);
> +		}
> +	}
> +	if (dobraces)
> +		fputs("]", stdout);
> +	if (dofname)
> +		printf(" %s ", fname);
> +	if (doeol)
> +		fputs("\n", stdout);
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +	int error;
> +	int c;
> +	const char *path = NULL;
> +	const char *path1 = NULL;
> +	const char *path2 = NULL;
> +	unsigned int at_flags = 0;
> +	unsigned int fa_xflags = 0;
> +	int action = 0; /* 0 get; 1 set */
> +	struct file_attr fsx = { };
> +	int fa_size = sizeof(struct file_attr);
> +	struct stat status;
> +	int fd;
> +	int at_fdcwd = 0;
> +	int unknwon_fa_flag = 0;
> +
> +	while (1) {
> +		int option_index = 0;
> +
> +		c = getopt_long_only(argc, argv, "", long_options,
> +				&option_index);
> +		if (c == -1)
> +			break;
> +
> +		switch (c) {
> +		case 's':
> +			action = 1;
> +			break;
> +		case 'g':
> +			action = 0;
> +			break;
> +		case 'n':
> +			at_flags |= AT_SYMLINK_NOFOLLOW;
> +			break;
> +		case 'a':
> +			at_fdcwd = 1;
> +			break;
> +		case 'd':
> +			fa_xflags |= FS_XFLAG_NODUMP;
> +			break;
> +		case 'i':
> +			at_flags |= (1 << 25);
> +			break;
> +		case 'b':
> +			fa_size = getpagesize() + 1; /* max size if page size */
> +			break;
> +		case 'm':
> +			fa_size = 19; /* VER0 size of fsxattr is 20 */
> +			break;
> +		case 'x':
> +			unknwon_fa_flag = (1 << 27);
> +			break;
> +		default:
> +			goto usage;
> +		}
> +	}
> +
> +	if (!path1 && optind < argc)
> +		path1 = argv[optind++];
> +	if (!path2 && optind < argc)
> +		path2 = argv[optind++];
> +
> +	if (at_fdcwd) {
> +		fd = AT_FDCWD;
> +		path = path1;
> +	} else if (!path2) {
> +		error = stat(path1, &status);
> +		if (error) {
> +			fprintf(stderr,
> +"Can not get file status of %s: %s\n", path1, strerror(errno));
> +			return error;
> +		}
> +
> +		if (SPECIAL_FILE(status.st_mode)) {
> +			fprintf(stderr,
> +"Can not open special file %s without parent dir: %s\n", path1, strerror(errno));
> +			return errno;
> +		}
> +
> +		fd = open(path1, O_RDONLY);
> +		if (fd == -1) {
> +			fprintf(stderr, "Can not open %s: %s\n", path1,
> +					strerror(errno));
> +			return errno;
> +		}
> +	} else {
> +		fd = open(path1, O_RDONLY);
> +		if (fd == -1) {
> +			fprintf(stderr, "Can not open %s: %s\n", path1,
> +					strerror(errno));
> +			return errno;
> +		}
> +		path = path2;
> +	}
> +
> +	if (!path)
> +		at_flags |= AT_EMPTY_PATH;
> +
> +	error = file_getattr(fd, path, &fsx, fa_size,
> +			at_flags);
> +	if (error) {
> +		fprintf(stderr, "Can not get fsxattr on %s: %s\n", path,
> +				strerror(errno));
> +		return error;
> +	}
> +	if (action) {
> +		fsx.fa_xflags |= (fa_xflags | unknwon_fa_flag);
> +
> +		error = file_setattr(fd, path, &fsx, fa_size,
> +				at_flags);
> +		if (error) {
> +			fprintf(stderr, "Can not set fsxattr on %s: %s\n", path,
> +					strerror(errno));
> +			return error;
> +		}
> +	} else {
> +		if (path2)
> +			print_xflags(fsx.fa_xflags, 0, 1, path, 0, 1);
> +		else
> +			print_xflags(fsx.fa_xflags, 0, 1, path1, 0, 1);
> +	}
> +
> +	return error;
> +
> +usage:
> +	printf("Usage: %s [options]\n", argv[0]);
> +	printf("Options:\n");
> +	printf("\t--get, -g\t\tget filesystem inode attributes\n");
> +	printf("\t--set, -s\t\tset filesystem inode attributes\n");
> +	printf("\t--at-cwd, -a\t\topen file at current working directory\n");
> +	printf("\t--no-follow, -n\t\tdon't follow symlinks\n");
> +	printf("\t--set-nodump, -d\t\tset FS_XFLAG_NODUMP on an inode\n");
> +	printf("\t--invalid-at, -i\t\tUse invalid AT_* flag\n");
> +	printf("\t--too-big-arg, -b\t\tSet fsxattr size bigger than PAGE_SIZE\n");
> +	printf("\t--too-small-arg, -m\t\tSet fsxattr size to 19 bytes\n");
> +	printf("\t--new-fsx-flag, -x\t\tUse unknown fa_flags flag\n");
> +
> +	return 1;
> +}
> 
> -- 
> 2.50.1
> 
> 

[PATCH v3 2/3] generic: introduce test to test file_getattr/file_setattr syscalls

[Andrey Albershteyn]

Add a test to test basic functionality of file_getattr() and
file_setattr() syscalls. Most of the work is done in file_attr
utility.

Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
---
 tests/generic/2000     | 109 +++++++++++++++++++++++++++++++++++++++++++++++++
 tests/generic/2000.out |  37 +++++++++++++++++
 2 files changed, 146 insertions(+)

diff --git a/tests/generic/2000 b/tests/generic/2000
new file mode 100755
index 000000000000..b03e9697bb14
--- /dev/null
+++ b/tests/generic/2000
@@ -0,0 +1,109 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2025 Red Hat Inc.  All Rights Reserved.
+#
+# FS QA Test No. 2000
+#
+# Test file_getattr/file_setattr syscalls
+#
+. ./common/preamble
+_begin_fstest auto
+
+. ./common/filter
+
+# Modify as appropriate.
+_require_scratch
+_require_test_program "af_unix"
+_require_test_program "file_attr"
+_require_symlinks
+_require_mknod
+
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+
+file_attr () {
+	$here/src/file_attr $*
+}
+
+create_af_unix () {
+	$here/src/af_unix $* || echo af_unix failed
+}
+
+projectdir=$SCRATCH_MNT/prj
+
+# Create normal files and special files
+mkdir $projectdir
+mkfifo $projectdir/fifo
+mknod $projectdir/chardev c 1 1
+mknod $projectdir/blockdev b 1 1
+create_af_unix $projectdir/socket
+touch $projectdir/foo
+ln -s $projectdir/foo $projectdir/symlink
+touch $projectdir/bar
+ln -s $projectdir/bar $projectdir/broken-symlink
+rm -f $projectdir/bar
+
+echo "Error codes"
+# wrong AT_ flags
+file_attr --get --invalid-at $projectdir ./foo
+file_attr --set --invalid-at $projectdir ./foo
+# wrong fsxattr size (too big, too small)
+file_attr --get --too-big-arg $projectdir ./foo
+file_attr --get --too-small-arg $projectdir ./foo
+file_attr --set --too-big-arg $projectdir ./foo
+file_attr --set --too-small-arg $projectdir ./foo
+# out of fsx_xflags mask
+file_attr --set --new-fsx-flag $projectdir ./foo
+
+echo "Initial attributes state"
+file_attr --get $projectdir | _filter_scratch
+file_attr --get $projectdir ./fifo
+file_attr --get $projectdir ./chardev
+file_attr --get $projectdir ./blockdev
+file_attr --get $projectdir ./socket
+file_attr --get $projectdir ./foo
+file_attr --get $projectdir ./symlink
+
+echo "Set FS_XFLAG_NODUMP (d)"
+file_attr --set --set-nodump $projectdir
+file_attr --set --set-nodump $projectdir ./fifo
+file_attr --set --set-nodump $projectdir ./chardev
+file_attr --set --set-nodump $projectdir ./blockdev
+file_attr --set --set-nodump $projectdir ./socket
+file_attr --set --set-nodump $projectdir ./foo
+file_attr --set --set-nodump $projectdir ./symlink
+
+echo "Read attributes"
+file_attr --get $projectdir | _filter_scratch
+file_attr --get $projectdir ./fifo
+file_attr --get $projectdir ./chardev
+file_attr --get $projectdir ./blockdev
+file_attr --get $projectdir ./socket
+file_attr --get $projectdir ./foo
+file_attr --get $projectdir ./symlink
+
+echo "Set attribute on broken link with AT_SYMLINK_NOFOLLOW"
+file_attr --set --set-nodump $projectdir ./broken-symlink
+file_attr --get $projectdir ./broken-symlink
+
+file_attr --set --no-follow --set-nodump $projectdir ./broken-symlink
+file_attr --get --no-follow $projectdir ./broken-symlink
+
+cd $SCRATCH_MNT
+touch ./foo2
+echo "Initial state of foo2"
+file_attr --get --at-cwd ./foo2
+echo "Set attribute relative to AT_FDCWD"
+file_attr --set --at-cwd --set-nodump ./foo2
+file_attr --get --at-cwd ./foo2
+
+echo "Set attribute on AT_FDCWD"
+mkdir ./bar
+file_attr --get --at-cwd ./bar
+cd ./bar
+file_attr --set --at-cwd --set-nodump ""
+file_attr --get --at-cwd .
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/2000.out b/tests/generic/2000.out
new file mode 100644
index 000000000000..11b1fcbb630b
--- /dev/null
+++ b/tests/generic/2000.out
@@ -0,0 +1,37 @@
+QA output created by 2000
+Error codes
+Can not get fsxattr on ./foo: Invalid argument
+Can not get fsxattr on ./foo: Invalid argument
+Can not get fsxattr on ./foo: Argument list too long
+Can not get fsxattr on ./foo: Invalid argument
+Can not get fsxattr on ./foo: Argument list too long
+Can not get fsxattr on ./foo: Invalid argument
+Can not set fsxattr on ./foo: Invalid argument
+Initial attributes state
+----------------- SCRATCH_MNT/prj 
+----------------- ./fifo 
+----------------- ./chardev 
+----------------- ./blockdev 
+----------------- ./socket 
+----------------- ./foo 
+----------------- ./symlink 
+Set FS_XFLAG_NODUMP (d)
+Read attributes
+------d---------- SCRATCH_MNT/prj 
+------d---------- ./fifo 
+------d---------- ./chardev 
+------d---------- ./blockdev 
+------d---------- ./socket 
+------d---------- ./foo 
+------d---------- ./symlink 
+Set attribute on broken link with AT_SYMLINK_NOFOLLOW
+Can not get fsxattr on ./broken-symlink: No such file or directory
+Can not get fsxattr on ./broken-symlink: No such file or directory
+------d---------- ./broken-symlink 
+Initial state of foo2
+----------------- ./foo2 
+Set attribute relative to AT_FDCWD
+------d---------- ./foo2 
+Set attribute on AT_FDCWD
+----------------- ./bar 
+------d---------- . 

-- 
2.50.1

Re: [PATCH v3 2/3] generic: introduce test to test file_getattr/file_setattr syscalls

[Andrey Albershteyn]

On 2025-09-09 17:25:57, Andrey Albershteyn wrote:
> Add a test to test basic functionality of file_getattr() and
> file_setattr() syscalls. Most of the work is done in file_attr
> utility.
> 
> Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
> ---
>  tests/generic/2000     | 109 +++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/2000.out |  37 +++++++++++++++++
>  2 files changed, 146 insertions(+)
> 
> diff --git a/tests/generic/2000 b/tests/generic/2000
> new file mode 100755
> index 000000000000..b03e9697bb14
> --- /dev/null
> +++ b/tests/generic/2000
> @@ -0,0 +1,109 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2025 Red Hat Inc.  All Rights Reserved.
> +#
> +# FS QA Test No. 2000
> +#
> +# Test file_getattr/file_setattr syscalls
> +#
> +. ./common/preamble
> +_begin_fstest auto
> +
> +. ./common/filter
> +
> +# Modify as appropriate.
> +_require_scratch
> +_require_test_program "af_unix"
> +_require_test_program "file_attr"
> +_require_symlinks
> +_require_mknod
> +
> +_scratch_mkfs >>$seqres.full 2>&1
> +_scratch_mount
> +
> +file_attr () {
> +	$here/src/file_attr $*
> +}
> +
> +create_af_unix () {
> +	$here/src/af_unix $* || echo af_unix failed
> +}
> +
> +projectdir=$SCRATCH_MNT/prj
> +
> +# Create normal files and special files
> +mkdir $projectdir
> +mkfifo $projectdir/fifo
> +mknod $projectdir/chardev c 1 1
> +mknod $projectdir/blockdev b 1 1
> +create_af_unix $projectdir/socket
> +touch $projectdir/foo
> +ln -s $projectdir/foo $projectdir/symlink
> +touch $projectdir/bar
> +ln -s $projectdir/bar $projectdir/broken-symlink
> +rm -f $projectdir/bar
> +
> +echo "Error codes"
> +# wrong AT_ flags
> +file_attr --get --invalid-at $projectdir ./foo
> +file_attr --set --invalid-at $projectdir ./foo
> +# wrong fsxattr size (too big, too small)
> +file_attr --get --too-big-arg $projectdir ./foo
> +file_attr --get --too-small-arg $projectdir ./foo
> +file_attr --set --too-big-arg $projectdir ./foo
> +file_attr --set --too-small-arg $projectdir ./foo
> +# out of fsx_xflags mask
> +file_attr --set --new-fsx-flag $projectdir ./foo
> +
> +echo "Initial attributes state"
> +file_attr --get $projectdir | _filter_scratch
> +file_attr --get $projectdir ./fifo
> +file_attr --get $projectdir ./chardev
> +file_attr --get $projectdir ./blockdev
> +file_attr --get $projectdir ./socket
> +file_attr --get $projectdir ./foo
> +file_attr --get $projectdir ./symlink
> +
> +echo "Set FS_XFLAG_NODUMP (d)"
> +file_attr --set --set-nodump $projectdir
> +file_attr --set --set-nodump $projectdir ./fifo
> +file_attr --set --set-nodump $projectdir ./chardev
> +file_attr --set --set-nodump $projectdir ./blockdev
> +file_attr --set --set-nodump $projectdir ./socket
> +file_attr --set --set-nodump $projectdir ./foo
> +file_attr --set --set-nodump $projectdir ./symlink
> +
> +echo "Read attributes"
> +file_attr --get $projectdir | _filter_scratch
> +file_attr --get $projectdir ./fifo
> +file_attr --get $projectdir ./chardev
> +file_attr --get $projectdir ./blockdev
> +file_attr --get $projectdir ./socket
> +file_attr --get $projectdir ./foo
> +file_attr --get $projectdir ./symlink
> +
> +echo "Set attribute on broken link with AT_SYMLINK_NOFOLLOW"
> +file_attr --set --set-nodump $projectdir ./broken-symlink
> +file_attr --get $projectdir ./broken-symlink
> +
> +file_attr --set --no-follow --set-nodump $projectdir ./broken-symlink
> +file_attr --get --no-follow $projectdir ./broken-symlink
> +
> +cd $SCRATCH_MNT
> +touch ./foo2
> +echo "Initial state of foo2"
> +file_attr --get --at-cwd ./foo2
> +echo "Set attribute relative to AT_FDCWD"
> +file_attr --set --at-cwd --set-nodump ./foo2
> +file_attr --get --at-cwd ./foo2
> +
> +echo "Set attribute on AT_FDCWD"
> +mkdir ./bar
> +file_attr --get --at-cwd ./bar
> +cd ./bar
> +file_attr --set --at-cwd --set-nodump ""
> +file_attr --get --at-cwd .
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/2000.out b/tests/generic/2000.out
> new file mode 100644
> index 000000000000..11b1fcbb630b
> --- /dev/null
> +++ b/tests/generic/2000.out
> @@ -0,0 +1,37 @@
> +QA output created by 2000
> +Error codes
> +Can not get fsxattr on ./foo: Invalid argument
> +Can not get fsxattr on ./foo: Invalid argument
> +Can not get fsxattr on ./foo: Argument list too long
> +Can not get fsxattr on ./foo: Invalid argument
> +Can not get fsxattr on ./foo: Argument list too long
> +Can not get fsxattr on ./foo: Invalid argument
> +Can not set fsxattr on ./foo: Invalid argument
> +Initial attributes state
> +----------------- SCRATCH_MNT/prj 

hmm, this needs to filter out ------X standing for extended
attributes, this test will fail if selinux is enabled for example

I will send another revision soon

-- 
- Andrey

[PATCH v3 3/3] xfs: test quota's project ID on special files

[Andrey Albershteyn]

From: Andrey Albershteyn <aalbersh@redhat.com>

With addition of file_getattr() and file_setattr(), xfs_quota now can
set project ID on filesystem inodes behind special files. Previously,
quota reporting didn't count inodes of special files created before
project initialization. Only new inodes had project ID set.

Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
---
 tests/xfs/2000     | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/2000.out | 15 +++++++++++
 2 files changed, 88 insertions(+)

diff --git a/tests/xfs/2000 b/tests/xfs/2000
new file mode 100755
index 000000000000..413022dd5d8a
--- /dev/null
+++ b/tests/xfs/2000
@@ -0,0 +1,73 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2025 Red Hat.  All Rights Reserved.
+#
+# FS QA Test No. 2000
+#
+# Test that XFS can set quota project ID on special files
+#
+. ./common/preamble
+_begin_fstest auto quota
+
+# Import common functions.
+. ./common/quota
+. ./common/filter
+
+# Modify as appropriate.
+_require_scratch
+_require_xfs_quota
+_require_test_program "af_unix"
+_require_test_program "file_attr"
+_require_symlinks
+_require_mknod
+
+_scratch_mkfs >>$seqres.full 2>&1
+_qmount_option "pquota"
+_scratch_mount
+
+create_af_unix () {
+	$here/src/af_unix $* || echo af_unix failed
+}
+
+filter_quota() {
+	_filter_quota | sed "s~$tmp.projects~PROJECTS_FILE~"
+}
+
+projectdir=$SCRATCH_MNT/prj
+id=42
+
+mkdir $projectdir
+mkfifo $projectdir/fifo
+mknod $projectdir/chardev c 1 1
+mknod $projectdir/blockdev b 1 1
+create_af_unix $projectdir/socket
+touch $projectdir/foo
+ln -s $projectdir/foo $projectdir/symlink
+touch $projectdir/bar
+ln -s $projectdir/bar $projectdir/broken-symlink
+rm -f $projectdir/bar
+
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "project -sp $projectdir $id" $SCRATCH_DEV | filter_quota
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "limit -p isoft=20 ihard=20 $id " $SCRATCH_DEV | filter_quota
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "project -cp $projectdir $id" $SCRATCH_DEV | filter_quota
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "report -inN -p" $SCRATCH_DEV | _filter_project_quota
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "project -Cp $projectdir $id" $SCRATCH_DEV | filter_quota
+
+# Let's check that we can recreate the project (flags were cleared out)
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "project -sp $projectdir $id" $SCRATCH_DEV | filter_quota
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "limit -p isoft=20 ihard=20 $id " $SCRATCH_DEV | filter_quota
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "report -inN -p" $SCRATCH_DEV | _filter_project_quota
+$XFS_QUOTA_PROG -D $tmp.projects -P $tmp.projid -x \
+	-c "project -Cp $projectdir $id" $SCRATCH_DEV | filter_quota
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/2000.out b/tests/xfs/2000.out
new file mode 100644
index 000000000000..e53ceb959775
--- /dev/null
+++ b/tests/xfs/2000.out
@@ -0,0 +1,15 @@
+QA output created by 2000
+Setting up project 42 (path SCRATCH_MNT/prj)...
+Processed 1 (PROJECTS_FILE and cmdline) paths for project 42 with recursion depth infinite (-1).
+Checking project 42 (path SCRATCH_MNT/prj)...
+Processed 1 (PROJECTS_FILE and cmdline) paths for project 42 with recursion depth infinite (-1).
+#42 8 20 20 00 [--------]
+
+Clearing project 42 (path SCRATCH_MNT/prj)...
+Processed 1 (PROJECTS_FILE and cmdline) paths for project 42 with recursion depth infinite (-1).
+Setting up project 42 (path SCRATCH_MNT/prj)...
+Processed 1 (PROJECTS_FILE and cmdline) paths for project 42 with recursion depth infinite (-1).
+#42 8 20 20 00 [--------]
+
+Clearing project 42 (path SCRATCH_MNT/prj)...
+Processed 1 (PROJECTS_FILE and cmdline) paths for project 42 with recursion depth infinite (-1).

-- 
2.50.1