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MFp4: gmirror(8) is coming soon, and we need g_metadata_read() there.

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This commit is contained in:
Pawel Jakub Dawidek 2004-07-05 02:06:44 +00:00
parent faf1b66d1d
commit 10fa0ebe1f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=131603
2 changed files with 55 additions and 0 deletions
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53
sbin/geom/misc/subr.c
View File

@ -133,6 +133,59 @@ g_get_sectorsize(const char *name)
return (sectorsize);
}
int
g_metadata_read(const char *name, u_char *md, size_t size, const char *magic)
{
struct std_metadata stdmd;
char path[MAXPATHLEN];
unsigned sectorsize;
off_t mediasize;
u_char *sector;
int error, fd;
pathgen(name, path, sizeof(path));
sector = NULL;
error = 0;
fd = open(path, O_RDONLY);
if (fd == -1)
return (errno);
mediasize = g_get_mediasize(name);
if (mediasize == 0) {
error = errno;
goto out;
}
sectorsize = g_get_sectorsize(name);
if (sectorsize == 0) {
error = errno;
goto out;
}
assert(sectorsize >= size);
sector = malloc(sectorsize);
if (sector == NULL) {
error = ENOMEM;
goto out;
}
if (pread(fd, sector, sectorsize, mediasize - sectorsize) !=
(ssize_t)sectorsize) {
error = errno;
goto out;
}
if (magic != NULL) {
std_metadata_decode(sector, &stdmd);
if (strcmp(stdmd.md_magic, magic) != 0) {
error = EINVAL;
goto out;
}
}
bcopy(sector, md, size);
out:
if (sector != NULL)
free(sector);
close(fd);
return (error);
}
int
g_metadata_store(const char *name, u_char *md, size_t size)
{

2
sbin/geom/misc/subr.h
View File

@ -33,6 +33,8 @@ unsigned g_lcm(unsigned a, unsigned b);
off_t g_get_mediasize(const char *name);
unsigned g_get_sectorsize(const char *name);
int g_metadata_read(const char *name, u_char *md, size_t size,
const char *magic);
int g_metadata_store(const char *name, u_char *md, size_t size);
int g_metadata_clear(const char *name, const char *magic);