[PATCH] f2fs-tools: get kernel version via uname(2)

[Jaegeuk Kim <jaegeuk@kernel.org>]

This patch introduces uname(2) to get kernel version.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fsck/mount.c       |  2 +-
 include/f2fs_fs.h  |  1 +
 lib/libf2fs.c      | 14 ++++++++++++++
 mkfs/f2fs_format.c |  2 +-
 4 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/fsck/mount.c b/fsck/mount.c
index e4ca0b8..61ea0ea 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -625,7 +625,7 @@ int validate_super_block(struct f2fs_sb_info *sbi, int block)
 			dev_read_version(c.version, 0, VERSION_LEN);
 			get_kernel_version(c.version);
 		} else {
-			memset(c.version, 0, VERSION_LEN);
+			get_kernel_uname_version(c.version);
 		}
 
 		/* build sb version */
diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index 8ed9db1..e800004 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -1118,6 +1118,7 @@ extern int dev_reada_block(__u64);
 
 extern int dev_read_version(void *, __u64, size_t);
 extern void get_kernel_version(__u8 *);
+extern void get_kernel_uname_version(__u8 *);
 f2fs_hash_t f2fs_dentry_hash(const unsigned char *, int);
 
 static inline bool f2fs_has_extra_isize(struct f2fs_inode *inode)
diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index 19491b6..9410732 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -27,6 +27,7 @@
 #ifdef HAVE_SYS_SYSMACROS_H
 #include <sys/sysmacros.h>
 #endif
+#include <sys/utsname.h>
 #ifndef WITH_ANDROID
 #ifdef HAVE_SCSI_SG_H
 #include <scsi/sg.h>
@@ -740,6 +741,17 @@ void get_kernel_version(__u8 *version)
 	memset(version + i, 0, VERSION_LEN + 1 - i);
 }
 
+void get_kernel_uname_version(__u8 *version)
+{
+	struct utsname buf;
+
+	memset(version, 0, VERSION_LEN);
+	if (uname(&buf))
+		return;
+
+	snprintf((char *)version,
+		VERSION_LEN, "%s %s", buf.release, buf.version);
+}
 
 #if defined(__linux__) && defined(_IO) && !defined(BLKGETSIZE)
 #define BLKGETSIZE	_IO(0x12,96)
@@ -796,7 +808,9 @@ int get_device_info(int i)
 	}
 
 	if (c.kd == -1) {
+#if !defined(WITH_ANDROID) && defined(__linux__)
 		c.kd = open("/proc/version", O_RDONLY);
+#endif
 		if (c.kd < 0) {
 			MSG(0, "\tInfo: No support kernel version!\n");
 			c.kd = -2;
diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index 0fc8b30..09886b4 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -442,7 +442,7 @@ static int f2fs_prepare_super_block(void)
 		get_kernel_version(c.version);
 		MSG(0, "Info: format version with\n  \"%s\"\n", c.version);
 	} else {
-		memset(c.version, 0, VERSION_LEN);
+		get_kernel_uname_version(c.version);
 	}
 
 	memcpy(sb->version, c.version, VERSION_LEN);
-- 
2.17.0.484.g0c8726318c-goog


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