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author | Richard Jones <rjones@redhat.com> | 2010-03-18 13:48:03 +0000 |
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committer | Richard Jones <rjones@redhat.com> | 2010-03-18 15:21:08 +0000 |
commit | 50d2af4f8541a81d047753d7d300804ff649230c (patch) | |
tree | 8bc80cd1004314574e9354c2215fd8485f3e3676 /daemon | |
parent | 27e73269d384814eb5f76468f609f7844cb75b0b (diff) | |
download | libguestfs-50d2af4f8541a81d047753d7d300804ff649230c.tar.gz libguestfs-50d2af4f8541a81d047753d7d300804ff649230c.tar.xz libguestfs-50d2af4f8541a81d047753d7d300804ff649230c.zip |
New APIs: Query the relationship between LVM objects.
These calls allow you to query the relationship between
LVM objects, for example, which PVs contain a VG, or which
LVs are contained in a VG.
See the example / test program 'regressions/test-lvm-mapping.pl'
for an example of how to do this from Perl.
Diffstat (limited to 'daemon')
-rw-r--r-- | daemon/lvm.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/daemon/lvm.c b/daemon/lvm.c index b100cd39..82cdf3fb 100644 --- a/daemon/lvm.c +++ b/daemon/lvm.c @@ -512,3 +512,86 @@ do_vgrename (const char *volgroup, const char *newvolgroup) return 0; } + +static char * +get_lvm_field (const char *cmd, const char *field, const char *device) +{ + char *out; + char *err; + int r = command (&out, &err, + "/sbin/lvm", cmd, + "--unbuffered", "--noheadings", "-o", field, + device, NULL); + if (r == -1) { + reply_with_error ("%s: %s", device, err); + free (out); + free (err); + return NULL; + } + + free (err); + + trim (out); + return out; /* Caller frees. */ +} + +char * +do_pvuuid (const char *device) +{ + return get_lvm_field ("pvs", "pv_uuid", device); +} + +char * +do_vguuid (const char *vgname) +{ + return get_lvm_field ("vgs", "vg_uuid", vgname); +} + +char * +do_lvuuid (const char *device) +{ + return get_lvm_field ("lvs", "lv_uuid", device); +} + +static char ** +get_lvm_fields (const char *cmd, const char *field, const char *device) +{ + char *out; + char *err; + int r = command (&out, &err, + "/sbin/lvm", cmd, + "--unbuffered", "--noheadings", "-o", field, + device, NULL); + if (r == -1) { + reply_with_error ("%s: %s", device, err); + free (out); + free (err); + return NULL; + } + + free (err); + + char **ret = split_lines (out); + free (out); + + if (ret == NULL) + return NULL; + + size_t i; + for (i = 0; ret[i] != NULL; ++i) + trim (ret[i]); + + return ret; +} + +char ** +do_vgpvuuids (const char *vgname) +{ + return get_lvm_fields ("vgs", "pv_uuid", vgname); +} + +char ** +do_vglvuuids (const char *vgname) +{ + return get_lvm_fields ("vgs", "lv_uuid", vgname); +} |