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From 604a29de2a70e97264e169957a224412868ca64a Mon Sep 17 00:00:00 2001
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From: "Darrick J. Wong" <darrick.wong@oracle.com>
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Date: Thu, 6 Feb 2014 15:24:01 -0500
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Subject: [PATCH 1/8] mke2fs: clean up kernel version tests
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Refactor the running kernel version checks to hide the details of
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version code checking, etc.
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Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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---
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misc/mke2fs.c | 40 ++++++++++++++++++++++++++--------------
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1 file changed, 26 insertions(+), 14 deletions(-)
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diff --git a/misc/mke2fs.c b/misc/mke2fs.c
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index 2e8ba60..2afcb05 100644
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--- a/misc/mke2fs.c
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+++ b/misc/mke2fs.c
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@@ -27,6 +27,7 @@
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#include <time.h>
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#ifdef __linux__
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#include <sys/utsname.h>
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+#include <linux/version.h>
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#endif
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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@@ -168,7 +169,29 @@ static int parse_version_number(const char *s)
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rev = strtol(cp, &endptr, 10);
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if (cp == endptr)
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return 0;
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- return ((((major * 256) + minor) * 256) + rev);
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+ return KERNEL_VERSION(major, minor, rev);
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+}
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+
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+static int is_before_linux_ver(unsigned int major, unsigned int minor)
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+{
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+ struct utsname ut;
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+ static int linux_version_code = -1;
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+
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+ if (uname(&ut)) {
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+ perror("uname");
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+ exit(1);
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+ }
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+ if (linux_version_code < 0)
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+ linux_version_code = parse_version_number(ut.release);
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+ if (linux_version_code == 0)
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+ return 0;
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+
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+ return linux_version_code < KERNEL_VERSION(major, minor, 0);
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+}
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+#else
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+static int is_before_linux_ver(unsigned int major, unsigned int minor)
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+{
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+ return 0;
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}
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#endif
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@@ -1306,9 +1329,6 @@ static void PRS(int argc, char *argv[])
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* Finally, we complain about fs_blocks_count > 2^32 on a non-64bit fs.
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*/
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blk64_t fs_blocks_count = 0;
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-#ifdef __linux__
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- struct utsname ut;
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-#endif
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long sysval;
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int s_opt = -1, r_opt = -1;
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char *fs_features = 0;
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@@ -1374,15 +1394,8 @@ profile_error:
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memset(&fs_param, 0, sizeof(struct ext2_super_block));
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fs_param.s_rev_level = 1; /* Create revision 1 filesystems now */
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-#ifdef __linux__
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- if (uname(&ut)) {
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- perror("uname");
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- exit(1);
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- }
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- linux_version_code = parse_version_number(ut.release);
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- if (linux_version_code && linux_version_code < (2*65536 + 2*256))
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+ if (is_before_linux_ver(2, 2))
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fs_param.s_rev_level = 0;
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-#endif
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if (argc && *argv) {
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program_name = get_progname(*argv);
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@@ -1790,8 +1803,7 @@ profile_error:
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if (use_bsize == -1) {
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use_bsize = sys_page_size;
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- if ((linux_version_code < (2*65536 + 6*256)) &&
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- (use_bsize > 4096))
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+ if (is_before_linux_ver(2, 6) && use_bsize > 4096)
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use_bsize = 4096;
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}
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if (lsector_size && use_bsize < lsector_size)
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--
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1.8.3.1
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