Add support for the new atomic_write_unit_min, atomic_write_unit_max, and
atomic_write_segments_max fields in statx for xfs_io. In order to support builds
against old kernel headers, define our own internal statx structs. If the
system's struct statx does not have the required atomic write fields, override
the struct definitions with the internal definitions in statx.h.
Signed-off-by: Catherine Hoang <catherine.hoang@xxxxxxxxxx>
---
configure.ac | 1 +
include/builddefs.in | 4 ++++
io/stat.c | 7 +++++++
io/statx.h | 23 ++++++++++++++++++++++-
m4/package_libcdev.m4 | 20 ++++++++++++++++++++
5 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index 33b01399..0b1ef3c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -146,6 +146,7 @@ AC_HAVE_COPY_FILE_RANGE
AC_NEED_INTERNAL_FSXATTR
AC_NEED_INTERNAL_FSCRYPT_ADD_KEY_ARG
AC_NEED_INTERNAL_FSCRYPT_POLICY_V2
+AC_NEED_INTERNAL_STATX
AC_HAVE_GETFSMAP
AC_HAVE_MAP_SYNC
AC_HAVE_DEVMAPPER
diff --git a/include/builddefs.in b/include/builddefs.in
index 1647d2cd..cbc9ab0c 100644
--- a/include/builddefs.in
+++ b/include/builddefs.in
@@ -96,6 +96,7 @@ HAVE_COPY_FILE_RANGE = @have_copy_file_range@
NEED_INTERNAL_FSXATTR = @need_internal_fsxattr@
NEED_INTERNAL_FSCRYPT_ADD_KEY_ARG = @need_internal_fscrypt_add_key_arg@
NEED_INTERNAL_FSCRYPT_POLICY_V2 = @need_internal_fscrypt_policy_v2@
+NEED_INTERNAL_STATX = @need_internal_statx@
HAVE_GETFSMAP = @have_getfsmap@
HAVE_MAP_SYNC = @have_map_sync@
HAVE_DEVMAPPER = @have_devmapper@
@@ -130,6 +131,9 @@ endif
ifeq ($(NEED_INTERNAL_FSCRYPT_POLICY_V2),yes)
PCFLAGS+= -DOVERRIDE_SYSTEM_FSCRYPT_POLICY_V2
endif
+ifeq ($(NEED_INTERNAL_STATX),yes)
+PCFLAGS+= -DOVERRIDE_SYSTEM_STATX
+endif
ifeq ($(HAVE_GETFSMAP),yes)
PCFLAGS+= -DHAVE_GETFSMAP
endif
diff --git a/io/stat.c b/io/stat.c
index 0f5618f6..7d1c1c93 100644
--- a/io/stat.c
+++ b/io/stat.c
@@ -6,6 +6,10 @@
* Portions of statx support written by David Howells (dhowells@xxxxxxxxxx)
*/
+#ifdef OVERRIDE_SYSTEM_STATX
+#define statx sys_statx
+#endif
+
#include "command.h"
#include "input.h"
#include "init.h"
@@ -347,6 +351,9 @@ dump_raw_statx(struct statx *stx)
printf("stat.rdev_minor = %u\n", stx->stx_rdev_minor);
printf("stat.dev_major = %u\n", stx->stx_dev_major);
printf("stat.dev_minor = %u\n", stx->stx_dev_minor);
+ printf("stat.atomic_write_unit_min = %lld\n", (long long)stx->stx_atomic_write_unit_min);
+ printf("stat.atomic_write_unit_max = %lld\n", (long long)stx->stx_atomic_write_unit_max);
+ printf("stat.atomic_write_segments_max = %lld\n", (long long)stx->stx_atomic_write_segments_max);
return 0;
}
diff --git a/io/statx.h b/io/statx.h
index c6625ac4..d151f732 100644
--- a/io/statx.h
+++ b/io/statx.h
@@ -61,6 +61,7 @@ struct statx_timestamp {
__s32 tv_nsec;
__s32 __reserved;
};
+#endif
/*
* Structures for the extended file attribute retrieval system call
@@ -99,6 +100,8 @@ struct statx_timestamp {
* will have values installed for compatibility purposes so that stat() and
* co. can be emulated in userspace.
*/
+#if !defined STATX_TYPE || defined OVERRIDE_SYSTEM_STATX
+#undef statx
struct statx {
/* 0x00 */
__u32 stx_mask; /* What results were written [uncond] */
@@ -126,10 +129,23 @@ struct statx {
__u32 stx_dev_major; /* ID of device containing file [uncond] */
__u32 stx_dev_minor;
/* 0x90 */
- __u64 __spare2[14]; /* Spare space for future expansion */
+ __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 stx_subvol; /* Subvolume identifier */
+ __u32 stx_atomic_write_unit_min; /* Min atomic write unit in bytes */
+ __u32 stx_atomic_write_unit_max; /* Max atomic write unit in bytes */
+ /* 0xb0 */
+ __u32 stx_atomic_write_segments_max; /* Max atomic write segment count */
+ __u32 __spare1[1];
+ /* 0xb8 */
+ __u64 __spare3[9]; /* Spare space for future expansion */
/* 0x100 */
};
+#endif
+#ifndef STATX_TYPE
/*
* Flags to be stx_mask
*
@@ -174,4 +190,9 @@ struct statx {
#define STATX_ATTR_AUTOMOUNT 0x00001000 /* Dir: Automount trigger */
#endif /* STATX_TYPE */
+
+#ifndef STATX_WRITE_ATOMIC
+#define STATX_WRITE_ATOMIC 0x00010000U /* Want/got atomic_write_* fields */
+#endif
+
#endif /* XFS_IO_STATX_H */
diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4
index 6de8b33e..bc8a49a9 100644
--- a/m4/package_libcdev.m4
+++ b/m4/package_libcdev.m4
@@ -98,6 +98,26 @@ AC_DEFUN([AC_NEED_INTERNAL_FSCRYPT_POLICY_V2],
AC_SUBST(need_internal_fscrypt_policy_v2)
])
+#
+# Check if we need to override the system struct statx with
+# the internal definition. This /only/ happens if the system
+# actually defines struct statx /and/ the system definition
+# is missing certain fields.
+#
+AC_DEFUN([AC_NEED_INTERNAL_STATX],
+ [ AC_CHECK_TYPE(struct statx,
+ [
+ AC_CHECK_MEMBER(struct statx.stx_atomic_write_unit_min,
+ ,
+ need_internal_statx=yes,
+ [#include <linux/stat.h>]
+ )
+ ],,
+ [#include <linux/stat.h>]
+ )
+ AC_SUBST(need_internal_statx)
+ ])
+
#
# Check if we have a FS_IOC_GETFSMAP ioctl (Linux)
#
--
2.34.1
