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Util: get device size from id 

Signed-off-by: Anna Czarnowska <anna.czarnowska@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Anna Czarnowska 2010-11-22 20:58:06 +11:00 committed by NeilBrown
parent d2db304558
commit 52d5d101a9
2 changed files with 17 additions and 0 deletions
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1
mdadm.h
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@ -747,6 +747,7 @@ static inline struct supertype *guess_super(int fd) {
extern struct supertype *dup_super(struct supertype *st);
extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
extern int must_be_container(int fd);
extern int dev_size_from_id(unsigned id, unsigned long long *size);
extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
mdu_disk_info_t *disk);
void wait_for(char *dev, int fd);

16
util.c
View File

@ -1094,6 +1094,22 @@ struct supertype *super_by_fd(int fd, char **subarrayp)
}
#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
int dev_size_from_id(unsigned int id, unsigned long long *size)
{
char buf[20];
int fd;
sprintf(buf, "%d:%d", major(id), minor(id));
fd = dev_open(buf, O_RDONLY);
if (fd < 0)
return 0;
if (get_dev_size(fd, NULL, size)) {
close(fd);
return 1;
}
close(fd);
return 0;
}
struct supertype *dup_super(struct supertype *orig)
{