[LTP] [PATCH v8 01/16] Add SAFE_STATX macro

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Reviewed-by: Avinesh Kumar <akumar@suse.de>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 include/lapi/stat.h                                | 107 +++++++++++++++------
 testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c |   2 +
 2 files changed, 77 insertions(+), 32 deletions(-)

diff --git a/include/lapi/stat.h b/include/lapi/stat.h
index 030646a9e..17b62ea98 100644
--- a/include/lapi/stat.h
+++ b/include/lapi/stat.h
@@ -30,6 +30,7 @@ struct statx_timestamp {
 	int32_t __reserved;
 };
 #endif
+
 /*
  * Structures for the extended file attribute retrieval system call
  * (statx()).
@@ -67,39 +68,53 @@ struct statx_timestamp {
  * will have values installed for compatibility purposes so that stat() and
  * co. can be emulated in userspace.
  */
-#ifndef HAVE_STRUCT_STATX
-struct statx {
-	/* 0x00 */
-	uint32_t	stx_mask;
-	uint32_t	stx_blksize;
-	uint64_t	stx_attributes;
-	/* 0x10 */
-	uint32_t	stx_nlink;
-	uint32_t	stx_uid;
-	uint32_t	stx_gid;
-	uint16_t	stx_mode;
-	uint16_t	__spare0[1];
-	/* 0x20 */
-	uint64_t	stx_ino;
-	uint64_t	stx_size;
-	uint64_t	stx_blocks;
-	uint64_t	stx_attributes_mask;
-	/* 0x40 */
-	const struct statx_timestamp	stx_atime;
-	const struct statx_timestamp	stx_btime;
-	const struct statx_timestamp	stx_ctime;
-	const struct statx_timestamp	stx_mtime;
-	/* 0x80 */
-	uint32_t	stx_rdev_major;
-	uint32_t	stx_rdev_minor;
-	uint32_t	stx_dev_major;
-	uint32_t	stx_dev_minor;
-	/* 0x90 */
-	uint64_t	__spare2[14];
-	/* 0x100 */
+ #define LTP_DEFINE_STATX_STRUCT(x) \
+ 	struct x { \
+	uint32_t	stx_mask; \
+	uint32_t	stx_blksize; \
+	uint64_t	stx_attributes; \
+	uint32_t	stx_nlink; \
+	uint32_t	stx_uid; \
+	uint32_t	stx_gid; \
+	uint16_t	stx_mode; \
+	uint16_t	__spare0[1]; \
+	uint64_t	stx_ino; \
+	uint64_t	stx_size; \
+	uint64_t	stx_blocks; \
+	uint64_t	stx_attributes_mask; \
+	const struct statx_timestamp	stx_atime; \
+	const struct statx_timestamp	stx_btime; \
+	const struct statx_timestamp	stx_ctime; \
+	const struct statx_timestamp	stx_mtime; \
+	uint32_t	stx_rdev_major; \
+	uint32_t	stx_rdev_minor; \
+	uint32_t	stx_dev_major; \
+	uint32_t	stx_dev_minor; \
+	uint64_t	stx_mnt_id; \
+	uint32_t	stx_dio_mem_align; \
+	uint32_t	stx_dio_offset_align; \
+	uint64_t	__spare3[12]; \
 };
+
+LTP_DEFINE_STATX_STRUCT(statx_fallback);
+
+#ifndef HAVE_STRUCT_STATX
+LTP_DEFINE_STATX_STRUCT(statx);
 #endif
 
+/*
+ * This is the fallback statx that we pass to the safe_statx() syscall.
+ * The reason why we need it, is that statx struct is constantly changing
+ * inside the kernel and we need to extend its definition when structure
+ * changes in order to compile the tests.
+ */
+struct ltp_statx {
+	union {
+		struct statx buff;
+		struct statx_fallback data;
+	};
+};
+
 #ifndef HAVE_STATX
 
 /*
@@ -108,9 +123,9 @@ struct statx {
  * Returns: It returns status of statx syscall
  */
 static inline int statx(int dirfd, const char *pathname, unsigned int flags,
-			unsigned int mask, struct statx *statxbuf)
+			unsigned int mask, struct statx *st)
 {
-	return tst_syscall(__NR_statx, dirfd, pathname, flags, mask, statxbuf);
+	return tst_syscall(__NR_statx, dirfd, pathname, flags, mask, st);
 }
 #endif
 
@@ -229,6 +244,10 @@ static inline int statx(int dirfd, const char *pathname, unsigned int flags,
 # define STATX_ATTR_VERITY	0x00100000
 #endif
 
+#ifndef STATX_MNT_ID_UNIQUE
+# define STATX_MNT_ID_UNIQUE  0x00004000U
+#endif
+
 #define SAFE_FCHMODAT2(dfd, filename, mode, flags) \
 	safe_fchmodat2(__FILE__, __LINE__, (dfd), (filename), (mode), (flags))
 
@@ -251,4 +270,28 @@ static inline int safe_fchmodat2(const char *file, const int lineno,
 	return ret;
 }
 
+#define SAFE_STATX(dirfd, pathname, flags, mask, buf) \
+	safe_statx(__FILE__, __LINE__, (dirfd), (pathname), (flags), (mask), (buf))
+
+static inline int safe_statx(const char *file, const int lineno,
+	int dirfd, const char *pathname, int flags, unsigned int mask,
+	struct ltp_statx *buf)
+{
+	int rval;
+
+	rval = statx(dirfd, pathname, flags, mask, &buf->buff);
+
+	if (rval == -1) {
+		tst_brk_(file, lineno, TBROK | TERRNO,
+			"statx(%d,%s,%d,%u,%p) failed", dirfd, pathname, flags, mask, buf);
+	} else if (rval) {
+		tst_brk_(file, lineno, TBROK | TERRNO,
+			"Invalid statx(%d,%s,%d,%u,%p) return value %d",
+			dirfd, pathname, flags, mask, buf,
+			rval);
+	}
+
+	return rval;
+}
+
 #endif /* LAPI_STAT_H__ */
diff --git a/testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c b/testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c
index a9932287c..f026b18df 100644
--- a/testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c
+++ b/testcases/kernel/syscalls/fchmodat2/fchmodat2_01.c
@@ -12,6 +12,8 @@
  * usage on symlinks will raise EOPNOTSUPP.
  */
 
+#define _GNU_SOURCE
+
 #include "tst_test.h"
 #include "tst_safe_file_at.h"
 #include "lapi/fcntl.h"

-- 
2.43.0