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Message-Id: <20230926133647.467179-2-rodrigo@sdfg.com.ar>
Date: Tue, 26 Sep 2023 15:36:47 +0200
From: Rodrigo Campos <rodrigo@...g.com.ar>
To: Willy Tarreau <w@....eu>,
Thomas Weißschuh <linux@...ssschuh.net>
Cc: linux-kernel@...r.kernel.org, Rodrigo Campos <rodrigo@...g.com.ar>
Subject: [PATCH 1/1] tools/nolibc: Add workarounds for centos-7
Centos-7 doesn't include statx on its linux/stat.h file. So, let's just
define it if the include doesn't define STATX_BASIC_STATS.
This makes nolibc work on centos-7 just fine, before this patch it
failed with:
nolibc/sys.h:987:78: warning: ‘struct statx’ declared inside parameter list [enabled by default]
int sys_statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
Please note that while on types.h we can still include linux/stat.h
and it won't cause any issues, it seems simpler if we just always
include "statx.h" instead of that file and be safe. That is why I
changed types.h too.
Signed-off-by: Rodrigo Campos <rodrigo@...g.com.ar>
---
tools/include/nolibc/statx.h | 218 +++++++++++++++++++++++++++++++++++
tools/include/nolibc/sys.h | 2 +-
tools/include/nolibc/types.h | 2 +-
3 files changed, 220 insertions(+), 2 deletions(-)
create mode 100644 tools/include/nolibc/statx.h
diff --git tools/include/nolibc/statx.h tools/include/nolibc/statx.h
new file mode 100644
index 000000000000..d05528754154
--- /dev/null
+++ tools/include/nolibc/statx.h
@@ -0,0 +1,218 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Compatibility header to allow using statx() on old distros.
+ * Copyright (C) 2023 Rodrigo Campos Catelin <rodrigo@...g.com.ar>
+ */
+
+#ifndef _NOLIBC_STATX_H
+#define _NOLIBC_STATX_H
+
+/* We should always include this file instead of linux/stat.h, so nolibc works
+ * in old distros too.
+ *
+ * The problem is centos-7, that doesn't have statx() defined in linux/stat.h.
+ * We can't include sys/stat.h because it creates conflicts, so let's just
+ * define it here.
+ * No other distros seem affected by this, so we can remove this file when it
+ * hits EOL (06/2024).
+ */
+#include <linux/stat.h> /* for statx() */
+
+#ifndef STATX_BASIC_STATS
+
+/* This is just a c&p from tools/include/uapi/linux/stat.h as it is in
+ * Linux 6.6-rc3.
+ * We don't need it all, but it's easier to just copy it all in case in the
+ * future we start using more of it, as we won't have CI running on centos-7.
+ */
+#include <linux/types.h>
+
+#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
+
+#define S_IFMT 00170000
+#define S_IFSOCK 0140000
+#define S_IFLNK 0120000
+#define S_IFREG 0100000
+#define S_IFBLK 0060000
+#define S_IFDIR 0040000
+#define S_IFCHR 0020000
+#define S_IFIFO 0010000
+#define S_ISUID 0004000
+#define S_ISGID 0002000
+#define S_ISVTX 0001000
+
+#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
+#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
+#define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
+#define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
+
+#define S_IRWXU 00700
+#define S_IRUSR 00400
+#define S_IWUSR 00200
+#define S_IXUSR 00100
+
+#define S_IRWXG 00070
+#define S_IRGRP 00040
+#define S_IWGRP 00020
+#define S_IXGRP 00010
+
+#define S_IRWXO 00007
+#define S_IROTH 00004
+#define S_IWOTH 00002
+#define S_IXOTH 00001
+
+#endif
+
+/*
+ * Timestamp structure for the timestamps in struct statx.
+ *
+ * tv_sec holds the number of seconds before (negative) or after (positive)
+ * 00:00:00 1st January 1970 UTC.
+ *
+ * tv_nsec holds a number of nanoseconds (0..999,999,999) after the tv_sec time.
+ *
+ * __reserved is held in case we need a yet finer resolution.
+ */
+struct statx_timestamp {
+ __s64 tv_sec;
+ __u32 tv_nsec;
+ __s32 __reserved;
+};
+
+/*
+ * Structures for the extended file attribute retrieval system call
+ * (statx()).
+ *
+ * The caller passes a mask of what they're specifically interested in as a
+ * parameter to statx(). What statx() actually got will be indicated in
+ * st_mask upon return.
+ *
+ * For each bit in the mask argument:
+ *
+ * - if the datum is not supported:
+ *
+ * - the bit will be cleared, and
+ *
+ * - the datum will be set to an appropriate fabricated value if one is
+ * available (eg. CIFS can take a default uid and gid), otherwise
+ *
+ * - the field will be cleared;
+ *
+ * - otherwise, if explicitly requested:
+ *
+ * - the datum will be synchronised to the server if AT_STATX_FORCE_SYNC is
+ * set or if the datum is considered out of date, and
+ *
+ * - the field will be filled in and the bit will be set;
+ *
+ * - otherwise, if not requested, but available in approximate form without any
+ * effort, it will be filled in anyway, and the bit will be set upon return
+ * (it might not be up to date, however, and no attempt will be made to
+ * synchronise the internal state first);
+ *
+ * - otherwise the field and the bit will be cleared before returning.
+ *
+ * Items in STATX_BASIC_STATS may be marked unavailable on return, but they
+ * will have values installed for compatibility purposes so that stat() and
+ * co. can be emulated in userspace.
+ */
+struct statx {
+ /* 0x00 */
+ __u32 stx_mask; /* What results were written [uncond] */
+ __u32 stx_blksize; /* Preferred general I/O size [uncond] */
+ __u64 stx_attributes; /* Flags conveying information about the file [uncond] */
+ /* 0x10 */
+ __u32 stx_nlink; /* Number of hard links */
+ __u32 stx_uid; /* User ID of owner */
+ __u32 stx_gid; /* Group ID of owner */
+ __u16 stx_mode; /* File mode */
+ __u16 __spare0[1];
+ /* 0x20 */
+ __u64 stx_ino; /* Inode number */
+ __u64 stx_size; /* File size */
+ __u64 stx_blocks; /* Number of 512-byte blocks allocated */
+ __u64 stx_attributes_mask; /* Mask to show what's supported in stx_attributes */
+ /* 0x40 */
+ struct statx_timestamp stx_atime; /* Last access time */
+ struct statx_timestamp stx_btime; /* File creation time */
+ struct statx_timestamp stx_ctime; /* Last attribute change time */
+ struct statx_timestamp stx_mtime; /* Last data modification time */
+ /* 0x80 */
+ __u32 stx_rdev_major; /* Device ID of special file [if bdev/cdev] */
+ __u32 stx_rdev_minor;
+ __u32 stx_dev_major; /* ID of device containing file [uncond] */
+ __u32 stx_dev_minor;
+ /* 0x90 */
+ __u64 stx_mnt_id;
+ __u32 stx_dio_mem_align; /* Memory buffer alignment for direct I/O */
+ __u32 stx_dio_offset_align; /* File offset alignment for direct I/O */
+ /* 0xa0 */
+ __u64 __spare3[12]; /* Spare space for future expansion */
+ /* 0x100 */
+};
+
+/*
+ * Flags to be stx_mask
+ *
+ * Query request/result mask for statx() and struct statx::stx_mask.
+ *
+ * These bits should be set in the mask argument of statx() to request
+ * particular items when calling statx().
+ */
+#define STATX_TYPE 0x00000001U /* Want/got stx_mode & S_IFMT */
+#define STATX_MODE 0x00000002U /* Want/got stx_mode & ~S_IFMT */
+#define STATX_NLINK 0x00000004U /* Want/got stx_nlink */
+#define STATX_UID 0x00000008U /* Want/got stx_uid */
+#define STATX_GID 0x00000010U /* Want/got stx_gid */
+#define STATX_ATIME 0x00000020U /* Want/got stx_atime */
+#define STATX_MTIME 0x00000040U /* Want/got stx_mtime */
+#define STATX_CTIME 0x00000080U /* Want/got stx_ctime */
+#define STATX_INO 0x00000100U /* Want/got stx_ino */
+#define STATX_SIZE 0x00000200U /* Want/got stx_size */
+#define STATX_BLOCKS 0x00000400U /* Want/got stx_blocks */
+#define STATX_BASIC_STATS 0x000007ffU /* The stuff in the normal stat struct */
+#define STATX_BTIME 0x00000800U /* Want/got stx_btime */
+#define STATX_MNT_ID 0x00001000U /* Got stx_mnt_id */
+#define STATX_DIOALIGN 0x00002000U /* Want/got direct I/O alignment info */
+
+#define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */
+
+#ifndef __KERNEL__
+/*
+ * This is deprecated, and shall remain the same value in the future. To avoid
+ * confusion please use the equivalent (STATX_BASIC_STATS | STATX_BTIME)
+ * instead.
+ */
+#define STATX_ALL 0x00000fffU
+#endif
+
+/*
+ * Attributes to be found in stx_attributes and masked in stx_attributes_mask.
+ *
+ * These give information about the features or the state of a file that might
+ * be of use to ordinary userspace programs such as GUIs or ls rather than
+ * specialised tools.
+ *
+ * Note that the flags marked [I] correspond to the FS_IOC_SETFLAGS flags
+ * semantically. Where possible, the numerical value is picked to correspond
+ * also. Note that the DAX attribute indicates that the file is in the CPU
+ * direct access state. It does not correspond to the per-inode flag that
+ * some filesystems support.
+ *
+ */
+#define STATX_ATTR_COMPRESSED 0x00000004 /* [I] File is compressed by the fs */
+#define STATX_ATTR_IMMUTABLE 0x00000010 /* [I] File is marked immutable */
+#define STATX_ATTR_APPEND 0x00000020 /* [I] File is append-only */
+#define STATX_ATTR_NODUMP 0x00000040 /* [I] File is not to be dumped */
+#define STATX_ATTR_ENCRYPTED 0x00000800 /* [I] File requires key to decrypt in fs */
+#define STATX_ATTR_AUTOMOUNT 0x00001000 /* Dir: Automount trigger */
+#define STATX_ATTR_MOUNT_ROOT 0x00002000 /* Root of a mount */
+#define STATX_ATTR_VERITY 0x00100000 /* [I] Verity protected file */
+#define STATX_ATTR_DAX 0x00200000 /* File is currently in DAX state */
+
+#endif // STATX_BASIC_STATS
+
+#endif // _NOLIBC_STATX_H
diff --git tools/include/nolibc/sys.h tools/include/nolibc/sys.h
index fdb6bd6c0e2f..d3e45793682a 100644
--- tools/include/nolibc/sys.h
+++ tools/include/nolibc/sys.h
@@ -20,9 +20,9 @@
#include <linux/time.h>
#include <linux/auxvec.h>
#include <linux/fcntl.h> /* for O_* and AT_* */
-#include <linux/stat.h> /* for statx() */
#include <linux/prctl.h>
+#include "statx.h" /* for statx() */
#include "arch.h"
#include "errno.h"
#include "types.h"
diff --git tools/include/nolibc/types.h tools/include/nolibc/types.h
index 8cfc4c860fa4..ccef87e9044c 100644
--- tools/include/nolibc/types.h
+++ tools/include/nolibc/types.h
@@ -10,9 +10,9 @@
#include "std.h"
#include <linux/mman.h>
#include <linux/reboot.h> /* for LINUX_REBOOT_* */
-#include <linux/stat.h>
#include <linux/time.h>
+#include "statx.h"
/* Only the generic macros and types may be defined here. The arch-specific
* ones such as the O_RDONLY and related macros used by fcntl() and open()
--
2.40.1
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