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cleanup: call uname once

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Call uname() once and keep result for mirror use-case.
This commit is contained in:
Zdenek Kabelac 2018-03-27 21:07:13 +02:00
parent d81e3f9b06
commit 1287edf626
4 changed files with 21 additions and 17 deletions
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1
WHATS_NEW_DM
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@ -1,5 +1,6 @@
Version 1.02.147 -
=====================================
Reuse uname() result for mirror target.
Recognize also mounted btrfs through dm_device_has_mounted_fs().
Add missing log_error() into dm_stats_populate() returning 0.
Avoid calling dm_stats_populat() for DM devices without any stats regions.

19
libdm/ioctl/libdm-iface.c
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@ -133,9 +133,9 @@ static char *_align(char *ptr, unsigned int a)
}
#ifdef DM_IOCTLS
static int _kernel_major = 0;
static int _kernel_minor = 0;
static int _kernel_release = 0;
static unsigned _kernel_major = 0;
static unsigned _kernel_minor = 0;
static unsigned _kernel_release = 0;
static int _uname(void)
{
@ -151,7 +151,7 @@ static int _uname(void)
return 0;
}
parts = sscanf(_uts.release, "%d.%d.%d",
parts = sscanf(_uts.release, "%u.%u.%u",
&_kernel_major, &_kernel_minor, &_kernel_release);
/* Kernels with a major number of 2 always had 3 parts. */
@ -164,6 +164,17 @@ static int _uname(void)
return 1;
}
int get_uname_version(unsigned *major, unsigned *minor, unsigned *release)
{
if (!_uname())
return_0;
*major = _kernel_major;
*minor = _kernel_minor;
*release = _kernel_release;
return 1;
}
/*
* Set number to NULL to populate _dm_bitset - otherwise first
* match is returned.

2
libdm/libdm-common.h
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@ -53,4 +53,6 @@ void dec_suspended(void);
int parse_thin_pool_status(const char *params, struct dm_status_thin_pool *s);
int get_uname_version(unsigned *major, unsigned *minor, unsigned *release);
#endif

16
libdm/libdm-deptree.c
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@ -2105,24 +2105,14 @@ static int _mirror_emit_segment_line(struct dm_task *dmt, struct load_segment *s
int block_on_error = 0;
int handle_errors = 0;
int dm_log_userspace = 0;
struct utsname uts;
unsigned log_parm_count;
int pos = 0, parts;
int pos = 0;
char logbuf[DM_FORMAT_DEV_BUFSIZE];
const char *logtype;
unsigned kmaj = 0, kmin = 0, krel = 0;
if (uname(&uts) == -1) {
log_error("Cannot read kernel release version.");
return 0;
}
/* Kernels with a major number of 2 always had 3 parts. */
parts = sscanf(uts.release, "%u.%u.%u", &kmaj, &kmin, &krel);
if (parts < 1 || (kmaj < 3 && parts < 3)) {
log_error("Wrong kernel release version %s.", uts.release);
return 0;
}
if (!get_uname_version(&kmaj, &kmin, &krel))
return_0;
if ((seg->flags & DM_BLOCK_ON_ERROR)) {
/*