[lvm-devel] LVM2/lib/metadata metadata-exported.h metadata.c
agk at sourceware.org
agk at sourceware.org
Tue Jan 27 01:48:49 UTC 2009
CVSROOT: /cvs/lvm2
Module name: LVM2
Changes by: agk at sourceware.org 2009-01-27 01:48:48
Modified files:
lib/metadata : metadata-exported.h metadata.c
Log message:
Add as-yet-unused vg_read_error() and vg_might_exist(). (mornfall)
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/metadata/metadata-exported.h.diff?cvsroot=lvm2&r1=1.59&r2=1.60
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/metadata/metadata.c.diff?cvsroot=lvm2&r1=1.201&r2=1.202
--- LVM2/lib/metadata/metadata-exported.h 2009/01/27 00:40:44 1.59
+++ LVM2/lib/metadata/metadata-exported.h 2009/01/27 01:48:47 1.60
@@ -387,12 +387,20 @@
uint32_t lock_flags, uint32_t status_flags,
uint32_t misc_flags);
-/* Loading volume group metadata. */
+/*
+ * Return a handle to VG metadata.
+ */
vg_t *vg_read(struct cmd_context *cmd, const char *vg_name,
const char *vgid, uint32_t flags);
vg_t *vg_read_for_update(struct cmd_context *cmd, const char *vg_name,
const char *vgid, uint32_t flags);
+/*
+ * Test validity of a VG handle.
+ */
+uint32_t vg_read_error(vg_t *vg_handle);
+uint32_t vg_might_exist(vg_t *vg_handle);
+
/* pe_start and pe_end relate to any existing data so that new metadata
* areas can avoid overlap */
pv_t *pv_create(const struct cmd_context *cmd,
--- LVM2/lib/metadata/metadata.c 2009/01/27 00:40:44 1.201
+++ LVM2/lib/metadata/metadata.c 2009/01/27 01:48:47 1.202
@@ -2674,6 +2674,46 @@
}
/*
+ * Test the validity of a VG handle returned by vg_read() or vg_read_for_update().
+ *
+ * If READ_CHECK_EXISTENCE was supplied the non-existence of the volume group
+ * is not considered an error.
+ *
+ * !vg_read_error() && vg_might_exist() => valid handle to VG.
+ * vg_read_error() && vg_might_exist() => handle invalid, but VG might
+ * exist but cannot be read.
+ * !vg_read_error() && !vg_might_exist() => the VG does not exist
+ * vg_read_error() && !vg_might_exist() is impossible.
+ */
+uint32_t vg_read_error(vg_t *vg_handle)
+{
+ if (!vg_handle)
+ return FAILED_ALLOCATION;
+
+ if (vg_handle->read_status & READ_CHECK_EXISTENCE)
+ return vg_handle->read_status &
+ ~(READ_CHECK_EXISTENCE | FAILED_NOTFOUND);
+
+ return vg_handle->read_status;
+}
+
+/*
+ * Returns true if the volume group already exists.
+ * If unsure, it will return true. It might exist but the read failed
+ * for some other reason.
+ */
+uint32_t vg_might_exist(vg_t *vg_handle)
+{
+ if (!vg_handle)
+ return 1;
+
+ if (vg_handle->read_status == (FAILED_NOTFOUND | READ_CHECK_EXISTENCE))
+ return 0;
+
+ return 1;
+}
+
+/*
* Gets/Sets for external LVM library
*/
struct id pv_id(const pv_t *pv)
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