LVM2/liblvm .exported_symbols lvm.h lvm_vg.c

LVM2/liblvm .exported_symbols lvm.h lvm_vg.c

[wysochanski]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	wysochanski@sourceware.org	2009-07-24 12:48:21

Modified files:
	liblvm         : .exported_symbols lvm.h lvm_vg.c 

Log message:
	Add lvm_scan_vgs liblvm fn to scan the system for LVM metadata.
	
	The lvm_list_vg_{names|ids} functions do not do a scan so we provide
	a liblvm function that does a scan.
	
	Author: Dave Wysochanski <dwysocha@redhat.com>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/.exported_symbols.diff?cvsroot=lvm2&r1=1.7&r2=1.8
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm.h.diff?cvsroot=lvm2&r1=1.11&r2=1.12
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm_vg.c.diff?cvsroot=lvm2&r1=1.7&r2=1.8

--- LVM2/liblvm/.exported_symbols	2009/07/24 12:47:15	1.7
+++ LVM2/liblvm/.exported_symbols	2009/07/24 12:48:21	1.8
@@ -14,6 +14,7 @@
 lvm_vg_open
 lvm_vg_close
 lvm_vg_remove
+lvm_scan_vgs
 lvm_errno
 lvm_errmsg
 lvm_vg_list_pvs
--- LVM2/liblvm/lvm.h	2009/07/24 12:47:15	1.11
+++ LVM2/liblvm/lvm.h	2009/07/24 12:48:21	1.12
@@ -265,6 +265,8 @@
  * Return a list of VG names or VG uuids in the system.
  *
  * NOTE: This function will _NOT_ scan devices in the system for LVM metadata.
+ * To scan the system, use lvm_scan_vgs.
+ *
  * To process the list, use the dm_list iterator functions.  For example:
  *      vg_t *vg;
  *      struct dm_list *vgnames;
@@ -286,5 +288,11 @@
 struct dm_list *lvm_list_vg_names(lvm_t libh);
 struct dm_list *lvm_list_vg_ids(lvm_t libh);
 
+/**
+ * Scan all devices on the system for VGs and LVM metadata.
+ *
+ * \return  Status code of 1 (success) or 0 (failure).
+ */
+int lvm_scan_vgs(lvm_t libh);
 
 #endif /* _LIB_LVM_H */
--- LVM2/liblvm/lvm_vg.c	2009/07/24 12:47:15	1.7
+++ LVM2/liblvm/lvm_vg.c	2009/07/24 12:48:21	1.8
@@ -22,6 +22,7 @@
 #include "archiver.h"
 #include "locking.h"
 #include "lvm-string.h"
+#include "lvmcache.h"
 
 vg_t *lvm_vg_create(lvm_t libh, const char *vg_name)
 {
@@ -198,3 +199,8 @@
 {
 	return get_vgids((struct cmd_context *)libh, 0);
 }
+
+int lvm_scan_vgs(lvm_t libh)
+{
+	return lvmcache_label_scan((struct cmd_context *)libh, 2);
+}

LVM2/liblvm .exported_symbols lvm.h lvm_vg.c

[wysochanski]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	wysochanski@sourceware.org	2009-07-27 17:44:29

Modified files:
	liblvm         : .exported_symbols lvm.h lvm_vg.c 

Log message:
	Add lvm_vg_reduce to liblvm2app
	
	Extend lvm_vg_write to remove pvs removed in lvm_vg_reduce. The lvm
	volume_group internal structure removed_pvs is used for that. The list is
	empty afterwards.
	
	Add new test for vg->pvs emptyness to lvm_vg_write to prevent to write empty
	vgs. This is needed because of lvm_vg_reduce and lv_vg_create, which creates
	empty vgs.
	
	Signed-off-by: Thomas Woerner <twoerner@redhat.com>
	Acked-by: Dave Wysochanski <dwysocha@redhat.com>
	
	Author: Dave Wysochanski <dwysocha@redhat.com>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/.exported_symbols.diff?cvsroot=lvm2&r1=1.17&r2=1.18
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm.h.diff?cvsroot=lvm2&r1=1.29&r2=1.30
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm_vg.c.diff?cvsroot=lvm2&r1=1.18&r2=1.19

--- LVM2/liblvm/.exported_symbols	2009/07/26 20:58:11	1.17
+++ LVM2/liblvm/.exported_symbols	2009/07/27 17:44:29	1.18
@@ -21,6 +21,7 @@
 lvm_lv_is_suspended
 lvm_vg_create
 lvm_vg_extend
+lvm_vg_reduce
 lvm_vg_set_extent_size
 lvm_vg_write
 lvm_vg_open
--- LVM2/liblvm/lvm.h	2009/07/27 11:00:18	1.29
+++ LVM2/liblvm/lvm.h	2009/07/27 17:44:29	1.30
@@ -331,6 +331,24 @@
 int lvm_vg_extend(vg_t *vg, const char *device);
 
 /**
+ * Reduce a VG by removing an unused device.
+ *
+ * This API requires calling lvm_vg_write to commit the change to disk.
+ * After successfully removing a device, use lvm_vg_write to commit the new VG
+ * to disk.  Upon failure, retry the operation or release the VG handle with
+ * lvm_vg_close.
+ *
+ * \param   vg
+ *          VG handle obtained from lvm_vg_create or lvm_vg_open.
+ *
+ * \param   device
+ *          Name of device to remove from VG.
+ *
+ * \return  0 (success) or -1 (failure).
+ */
+int lvm_vg_reduce(vg_t *vg, const char *device);
+
+/**
  * Set the extent size of a VG.
  *
  * This API requires calling lvm_vg_write to commit the change to disk.
--- LVM2/liblvm/lvm_vg.c	2009/07/27 11:00:18	1.18
+++ LVM2/liblvm/lvm_vg.c	2009/07/27 17:44:29	1.19
@@ -68,6 +68,16 @@
 	return 0;
 }
 
+int lvm_vg_reduce(vg_t *vg, const char *device)
+{
+	if (vg_read_error(vg))
+		return -1;
+
+	if (!vg_reduce(vg, (char *)device))
+		return -1;
+	return 0;
+}
+
 int lvm_vg_set_extent_size(vg_t *vg, uint32_t new_size)
 {
 	if (vg_read_error(vg))
@@ -80,15 +90,40 @@
 
 int lvm_vg_write(vg_t *vg)
 {
+	struct pv_list *pvl;
+
 	if (vg_read_error(vg))
 		return -1;
 
+	if (dm_list_empty(&vg->pvs)) {
+		log_error("Volume group %s does not contain any "
+			  "physical volumes.\n", vg->name);
+		return -1;
+	}
+
+	if (! dm_list_empty(&vg->removed_pvs)) {
+		if (!lock_vol(vg->cmd, VG_ORPHANS, LCK_VG_WRITE)) {
+			log_error("Can't get lock for orphan PVs");
+			return 0;
+		}
+	}
+
 	if (!archive(vg))
 		return -1;
 
 	/* Store VG on disk(s) */
 	if (!vg_write(vg) || !vg_commit(vg))
 		return -1;
+
+	if (! dm_list_empty(&vg->removed_pvs)) {
+		dm_list_iterate_items(pvl, &vg->removed_pvs) {
+			pv_write_orphan(vg->cmd, pvl->pv);
+			/* FIXME: do pvremove / label_remove()? */
+		}
+		dm_list_init(&vg->removed_pvs);
+		unlock_vg(vg->cmd, VG_ORPHANS);
+	}
+
 	return 0;
 }
 

LVM2/liblvm .exported_symbols lvm.h lvm_vg.c

[wysochanski]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	wysochanski@sourceware.org	2009-07-26 16:05:50

Modified files:
	liblvm         : .exported_symbols lvm.h lvm_vg.c 

Log message:
	Rename lvm_vg_get_free_count to lvm_vg_get_free_extent_count.
	
	Author: Dave Wysochanski <dwysocha@redhat.com>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/.exported_symbols.diff?cvsroot=lvm2&r1=1.11&r2=1.12
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm.h.diff?cvsroot=lvm2&r1=1.16&r2=1.17
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm_vg.c.diff?cvsroot=lvm2&r1=1.11&r2=1.12

--- LVM2/liblvm/.exported_symbols	2009/07/26 14:36:52	1.11
+++ LVM2/liblvm/.exported_symbols	2009/07/26 16:05:49	1.12
@@ -10,7 +10,7 @@
 lvm_vg_get_free
 lvm_vg_get_extent_size
 lvm_vg_get_extent_count
-lvm_vg_get_free_count
+lvm_vg_get_free_extent_count
 lvm_vg_get_pv_count
 lvm_lv_get_uuid
 lvm_lv_get_name
--- LVM2/liblvm/lvm.h	2009/07/26 14:36:52	1.16
+++ LVM2/liblvm/lvm.h	2009/07/26 16:05:49	1.17
@@ -264,7 +264,7 @@
 uint64_t lvm_vg_get_free(const vg_t *vg);
 uint64_t lvm_vg_get_extent_size(const vg_t *vg);
 uint64_t lvm_vg_get_extent_count(const vg_t *vg);
-uint64_t lvm_vg_get_free_count(const vg_t *vg);
+uint64_t lvm_vg_get_free_extent_count(const vg_t *vg);
 uint64_t lvm_vg_get_pv_count(const vg_t *vg);
 uint64_t lvm_lv_get_size(const lv_t *lv);
 
--- LVM2/liblvm/lvm_vg.c	2009/07/26 13:06:59	1.11
+++ LVM2/liblvm/lvm_vg.c	2009/07/26 16:05:49	1.12
@@ -211,7 +211,7 @@
 	return vg_extent_count(vg);
 }
 
-uint64_t lvm_vg_get_free_count(const vg_t *vg)
+uint64_t lvm_vg_get_free_extent_count(const vg_t *vg)
 {
 	return vg_free_count(vg);
 }

LVM2/liblvm .exported_symbols lvm.h lvm_vg.c

[wysochanski]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	wysochanski@sourceware.org	2009-07-24 12:47:15

Modified files:
	liblvm         : .exported_symbols lvm.h lvm_vg.c 

Log message:
	Add lvm_list_vg_names and lvm_list_vg_ids liblvm functions.
	
	These functions provide the capability of enumerating all vgnames and
	vgids in the system.  They do not do a scan of the system.
	
	Author: Dave Wysochanski <dwysocha@redhat.com>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/.exported_symbols.diff?cvsroot=lvm2&r1=1.6&r2=1.7
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm.h.diff?cvsroot=lvm2&r1=1.10&r2=1.11
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm_vg.c.diff?cvsroot=lvm2&r1=1.6&r2=1.7

--- LVM2/liblvm/.exported_symbols	2009/07/23 23:40:05	1.6
+++ LVM2/liblvm/.exported_symbols	2009/07/24 12:47:15	1.7
@@ -18,3 +18,5 @@
 lvm_errmsg
 lvm_vg_list_pvs
 lvm_vg_list_lvs
+lvm_list_vg_names
+lvm_list_vg_ids
--- LVM2/liblvm/lvm.h	2009/07/23 23:40:05	1.10
+++ LVM2/liblvm/lvm.h	2009/07/24 12:47:15	1.11
@@ -44,6 +44,11 @@
 	lv_t *lv;
 } lv_list_t;
 
+struct lvm_str_list {
+	struct dm_list list;
+	const char *str;
+};
+
 /**
  * Return a list of LV handles for a given VG handle.
  *
@@ -256,4 +261,30 @@
  */
 struct dm_list *lvm_vg_list_pvs(vg_t *vg);
 
+/**
+ * Return a list of VG names or VG uuids in the system.
+ *
+ * NOTE: This function will _NOT_ scan devices in the system for LVM metadata.
+ * To process the list, use the dm_list iterator functions.  For example:
+ *      vg_t *vg;
+ *      struct dm_list *vgnames;
+ *      struct lvm_str_list *strl;
+ *
+ *      vgnames = lvm_list_vg_names(libh);
+ *	dm_list_iterate_items(strl, vgnames) {
+ *		vgname = strl->str;
+ *              vg = lvm_vg_open(libh, vgname, "r");
+ *              // do something with vg
+ *              lvm_vg_close(vg);
+ *      }
+ *
+ *
+ * \return  A list of struct lvm_str_list
+ *          If no VGs exist on the system, NULL is returned.
+ * FIXME: handle list memory cleanup
+ */
+struct dm_list *lvm_list_vg_names(lvm_t libh);
+struct dm_list *lvm_list_vg_ids(lvm_t libh);
+
+
 #endif /* _LIB_LVM_H */
--- LVM2/liblvm/lvm_vg.c	2009/07/23 23:40:05	1.6
+++ LVM2/liblvm/lvm_vg.c	2009/07/24 12:47:15	1.7
@@ -188,3 +188,13 @@
 	name[NAME_LEN] = '\0';
 	return name;
 }
+
+struct dm_list *lvm_list_vg_names(lvm_t libh)
+{
+	return get_vgnames((struct cmd_context *)libh, 0);
+}
+
+struct dm_list *lvm_list_vg_ids(lvm_t libh)
+{
+	return get_vgids((struct cmd_context *)libh, 0);
+}

LVM2/liblvm .exported_symbols lvm.h lvm_vg.c

[wysochanski]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	wysochanski@sourceware.org	2009-07-23 23:39:02

Modified files:
	liblvm         : .exported_symbols lvm.h lvm_vg.c 

Log message:
	Add lvm_vg_list_{pvs|lvs} - return lists of pv/lv handles for a vg.
	
	- Use vgmem pool to allocate a list of lvm_*_list structs
	- Allocate a new list each call (list may have changed since last call)
	- Add to liblvm's exported symbols
	
	Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
	Acked-by: Thomas Woerner <twoerner@redhat.com>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/.exported_symbols.diff?cvsroot=lvm2&r1=1.4&r2=1.5
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm.h.diff?cvsroot=lvm2&r1=1.8&r2=1.9
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm_vg.c.diff?cvsroot=lvm2&r1=1.4&r2=1.5

--- LVM2/liblvm/.exported_symbols	2009/07/22 22:24:16	1.4
+++ LVM2/liblvm/.exported_symbols	2009/07/23 23:39:02	1.5
@@ -10,3 +10,5 @@
 lvm_vg_remove
 lvm_errno
 lvm_errmsg
+lvm_vg_list_pvs
+lvm_vg_list_lvs
--- LVM2/liblvm/lvm.h	2009/07/23 23:37:24	1.8
+++ LVM2/liblvm/lvm.h	2009/07/23 23:39:02	1.9
@@ -44,6 +44,13 @@
 	lv_t *lv;
 } lv_list_t;
 
+/**
+ * Return a list of LV handles for a given VG handle.
+ *
+ * \return  A list of lv_list_t structures containing lv handles for this vg.
+ *          If no LVs exist on the given VG, NULL is returned.
+ */
+struct dm_list *lvm_vg_list_lvs(vg_t *vg);
 
 struct lvm; /* internal data */
 
@@ -225,4 +232,12 @@
 vg_t *lvm_vg_open(lvm_t libh, const char *vgname, const char *mode,
 		  uint32_t flags);
 
+/**
+ * Return a list of PV handles for a given VG handle.
+ *
+ * \return  A list of pv_list_t structures containing pv handles for this vg.
+ *          If no PVs exist on the given VG, NULL is returned.
+ */
+struct dm_list *lvm_vg_list_pvs(vg_t *vg);
+
 #endif /* _LIB_LVM_H */
--- LVM2/liblvm/lvm_vg.c	2009/07/23 01:20:22	1.4
+++ LVM2/liblvm/lvm_vg.c	2009/07/23 23:39:02	1.5
@@ -114,3 +114,55 @@
 
 	return vg;
 }
+
+struct dm_list *lvm_vg_list_pvs(vg_t *vg)
+{
+	struct dm_list *list;
+	pv_list_t *pvs;
+	struct pv_list *pvl;
+
+	if (dm_list_empty(&vg->pvs))
+		return NULL;
+
+	if (!(list = dm_pool_zalloc(vg->vgmem, sizeof(*list)))) {
+		log_error("Memory allocation fail for dm_list.\n");
+		return NULL;
+	}
+	dm_list_init(list);
+
+	dm_list_iterate_items(pvl, &vg->pvs) {
+		if (!(pvs = dm_pool_zalloc(vg->vgmem, sizeof(*pvs)))) {
+			log_error("Memory allocation fail for lvm_pv_list.\n");
+			return NULL;
+		}
+		pvs->pv = pvl->pv;
+		dm_list_add(list, &pvs->list);
+	}
+	return list;
+}
+
+struct dm_list *lvm_vg_list_lvs(vg_t *vg)
+{
+	struct dm_list *list;
+	lv_list_t *lvs;
+	struct lv_list *lvl;
+
+	if (dm_list_empty(&vg->lvs))
+		return NULL;
+
+	if (!(list = dm_pool_zalloc(vg->vgmem, sizeof(*list)))) {
+		log_error("Memory allocation fail for dm_list.\n");
+		return NULL;
+	}
+	dm_list_init(list);
+
+	dm_list_iterate_items(lvl, &vg->lvs) {
+		if (!(lvs = dm_pool_zalloc(vg->vgmem, sizeof(*lvs)))) {
+			log_error("Memory allocation fail for lvm_lv_list.\n");
+			return NULL;
+		}
+		lvs->lv = lvl->lv;
+		dm_list_add(list, &lvs->list);
+	}
+	return list;
+}

LVM2/liblvm .exported_symbols lvm.h lvm_vg.c

[wysochanski]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	wysochanski@sourceware.org	2009-07-22 22:24:17

Modified files:
	liblvm         : .exported_symbols lvm.h lvm_vg.c 

Log message:
	Add lvm_vg_open() to open an existing VG for reading or writing.
	
	lvm_vg_open() calls internal vg_read() function which is the entry point
	for reading an existing VG.  In addition to the mode, we include a 'flags'
	parameter for future extensions.
	
	Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/.exported_symbols.diff?cvsroot=lvm2&r1=1.3&r2=1.4
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm.h.diff?cvsroot=lvm2&r1=1.4&r2=1.5
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/liblvm/lvm_vg.c.diff?cvsroot=lvm2&r1=1.2&r2=1.3

--- LVM2/liblvm/.exported_symbols	2009/07/22 03:13:13	1.3
+++ LVM2/liblvm/.exported_symbols	2009/07/22 22:24:16	1.4
@@ -5,6 +5,7 @@
 lvm_vg_extend
 lvm_vg_set_extent_size
 lvm_vg_write
+lvm_vg_open
 lvm_vg_close
 lvm_vg_remove
 lvm_errno
--- LVM2/liblvm/lvm.h	2009/07/16 03:07:46	1.4
+++ LVM2/liblvm/lvm.h	2009/07/22 22:24:16	1.5
@@ -190,4 +190,27 @@
  */
 int lvm_vg_close(vg_t *vg);
 
+/**
+ * Open an existing VG.
+ *
+ * Open a VG for reading or writing.
+ *
+ * \param   libh
+ *          Handle obtained from lvm_create.
+ *
+ * \param   vgname
+ *          Name of the VG to open.
+ *
+ * \param   mode
+ *          Open mode - either "r" (read) or "w" (read/write).
+ *          Any other character results in an error with EINVAL set.
+ *
+ * \param   flags
+ *          Open flags - currently ignored.
+ *
+ * \return  non-NULL VG handle (success) or NULL (failure).
+ */
+vg_t *lvm_vg_open(lvm_t libh, const char *vgname, const char *mode,
+		  uint32_t flags);
+
 #endif /* _LIB_LVM_H */
--- LVM2/liblvm/lvm_vg.c	2009/07/22 03:13:35	1.2
+++ LVM2/liblvm/lvm_vg.c	2009/07/22 22:24:16	1.3
@@ -12,6 +12,9 @@
  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <errno.h>
+#include <string.h>
+
 #include "lib.h"
 #include "lvm.h"
 #include "toolcontext.h"
@@ -80,3 +83,26 @@
 bad:
 	return 0;
 }
+
+vg_t *lvm_vg_open(lvm_t libh, const char *vgname, const char *mode,
+		  uint32_t flags)
+{
+	uint32_t internal_flags = 0;
+	vg_t *vg;
+
+	if (!strncmp(mode, "w", 1))
+		internal_flags |= READ_FOR_UPDATE;
+	else if (strncmp(mode, "r", 1)) {
+		log_errno(EINVAL, "Invalid VG open mode");
+		return NULL;
+	}
+
+	vg = vg_read((struct cmd_context *)libh, vgname, NULL, internal_flags);
+	if (vg_read_error(vg)) {
+		/* FIXME: use log_errno either here in inside vg_read */
+		vg_release(vg);
+		return NULL;
+	}
+
+	return vg;
+}