File lvm-pv-create-link.diff of Package lvm2-clvm

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File lvm-pv-create-link.diff of Package lvm2-clvm

Index: LVM2.2.02.67/tools/pvremove.c
===================================================================
--- LVM2.2.02.67.orig/tools/pvremove.c	2009-12-03 20:18:34.000000000 +0100
+++ LVM2.2.02.67/tools/pvremove.c	2010-09-09 13:51:21.370385527 +0200
@@ -18,6 +18,30 @@
 const char _really_wipe[] =
     "Really WIPE LABELS from physical volume \"%s\" of volume group \"%s\" [y/n]? ";
 
+static const char* pv_remove_symlink(struct cmd_context* cmd, const char* name)
+{
+	struct physical_volume *pv;
+	char *pvuuid;
+	char pvuuid_link[70];
+
+	if (!(pv = pv_read(cmd, name, NULL, NULL, 0, 0))) {
+		return NULL;
+	}
+
+	pvuuid = malloc(sizeof(char)*40);
+	if (pvuuid == NULL) {
+		return NULL;
+	}
+
+	id_write_format(&pv->id, pvuuid, 40);
+
+	snprintf(pvuuid_link, 70, "/dev/disk/by-id/lvm2-pvuuid-%s", pvuuid);
+	unlink(pvuuid_link); //we really don't care if it successed or not.
+
+	free(pvuuid);
+	return pvuuid;
+}
+
 /*
  * Decide whether it is "safe" to wipe the labels on this device.
  * 0 indicates we may not.
@@ -125,6 +149,8 @@ static int pvremove_single(struct cmd_co
 	log_print("Labels on physical volume \"%s\" successfully wiped",
 		  pv_name);
 
+	pv_remove_symlink(cmd, pv_name);
+
 	ret = ECMD_PROCESSED;
 
       error:
Index: LVM2.2.02.67/tools/pvchange.c
===================================================================
--- LVM2.2.02.67.orig/tools/pvchange.c	2010-05-19 17:34:10.000000000 +0200
+++ LVM2.2.02.67/tools/pvchange.c	2010-09-09 13:51:21.370385527 +0200
@@ -15,6 +15,90 @@
 
 #include "tools.h"
 
+static const char* pv_follow_if_link (const char* path)
+{
+	int r;
+	int len = 60;
+	char *fpath = NULL;
+	char *npath = NULL;
+	struct stat st;
+
+	r = lstat(path, &st);
+	if (r == -1) return NULL; //shouldn't happen
+
+	if (S_ISLNK(st.st_mode)) {
+		while (1) {
+			npath = realloc(fpath, sizeof(char)*len);
+			if (npath == NULL) {
+				if (fpath != NULL) free(fpath);
+				return NULL;
+			}
+			fpath = npath;
+
+			memset(fpath, 0, sizeof(char)*len);
+			r = readlink(path, fpath, len);
+			if (r != -1 && fpath[len-1] == 0) break;
+			if (r == -1) {
+				free(fpath);
+				return NULL;
+			} else {
+				len = len * 2;
+			}
+		}
+	}
+	else {
+		fpath = strdup(path);
+	}
+	return fpath;
+}
+
+static const char* pv_symlink_handle(struct cmd_context* cmd, const char* name, int create)
+{
+	struct physical_volume *pv;
+	char *pvuuid;
+	char *pvuuid_link;
+
+	pvuuid_link = malloc(70);
+	if (pvuuid_link == NULL) return NULL;
+
+
+	if (!(pv = pv_read(cmd, name, NULL, NULL, 0, 0))) {
+		free(pvuuid_link);
+		return NULL;
+	}
+
+	pvuuid = malloc(sizeof(char)*40);
+	if (pvuuid == NULL) {
+		free(pvuuid_link);
+		return NULL;
+	}
+
+	id_write_format(&pv->id, pvuuid, 40);
+
+	snprintf(pvuuid_link, 70, "/dev/disk/by-id/lvm2-pvuuid-%s", pvuuid);
+
+	//we really don't care if it successed or not.
+	if (create) {
+		const char* tname = NULL;
+		int r;
+		tname = pv_follow_if_link(name);
+		if (tname != NULL) {
+			r = symlink(tname, pvuuid_link);
+			free(tname);
+		}
+		else {
+			symlink(name, pvuuid_link);
+		}
+	} else {
+		//pvuuid_link is saved for future unlink
+		//unlink(pvuuid_link);
+	}
+
+	free(pvuuid);
+	return pvuuid_link;
+}
+
+
 /* FIXME Locking.  PVs in VG. */
 
 static int _pvchange_single(struct cmd_context *cmd, struct volume_group *vg,
Index: LVM2.2.02.67/lib/metadata/metadata.c
===================================================================
--- LVM2.2.02.67.orig/lib/metadata/metadata.c	2010-05-24 17:32:20.000000000 +0200
+++ LVM2.2.02.67/lib/metadata/metadata.c	2010-09-09 13:52:19.866385579 +0200
@@ -1424,6 +1424,88 @@ void pvcreate_params_set_defaults(struct
 	pp->yes = 0;
 }
 
+static const char* pv_follow_if_link (const char* path)
+{
+	int r;
+	int len = 60;
+	char *fpath = NULL;
+	char *npath = NULL;
+	struct stat st;
+
+	r = lstat(path, &st);
+	if (r == -1) return NULL; //shouldn't happen
+
+	if (S_ISLNK(st.st_mode)) {
+		while (1) {
+			npath = realloc(fpath, sizeof(char)*len);
+			if (npath == NULL) {
+				if (fpath != NULL) free(fpath);
+				return NULL;
+			}
+			fpath = npath;
+
+			memset(fpath, 0, sizeof(char)*len);
+			r = readlink(path, fpath, len);
+			if (r != -1 && fpath[len-1] == 0) break;
+			if (r == -1) {
+				free(fpath);
+				return NULL;
+			} else {
+				len = len * 2;
+			}
+		}
+	} else {
+		fpath = strdup(path);
+	}
+	return fpath;
+}
+
+
+static const char* pv_symlink_handle(struct cmd_context* cmd, const char* name, int create)
+{
+	struct physical_volume *pv;
+	char *pvuuid;
+	char *pvuuid_link;
+
+	pvuuid_link = malloc(70);
+	if (pvuuid_link == NULL) return NULL;
+
+	if (!(pv = pv_read(cmd, name, NULL, NULL, 0, 0))) {
+		free(pvuuid_link);
+		return NULL;
+	}
+
+	pvuuid = malloc(sizeof(char)*40);
+	if (pvuuid == NULL) {
+		free(pvuuid_link);
+		return NULL;
+	}
+
+	id_write_format(&pv->id, pvuuid, 40);
+	snprintf(pvuuid_link, 70, "/dev/disk/by-id/lvm2-pvuuid-%s", pvuuid);
+
+	//we really don't care if it successed or not.
+	if (create) {
+		const char* tname = NULL;
+		int r;
+		tname = pv_follow_if_link(name);
+		if (tname != NULL) {
+			r = symlink(tname, pvuuid_link);
+			free(tname);
+		} else {
+			symlink(name, pvuuid_link);
+		}
+	} else {
+		//pvuuid_link is saved for future unlink
+		//unlink(pvuuid_link);
+	}
+
+	free(pvuuid);
+	return pvuuid_link;
+}
+
+
+
 /*
  * pvcreate_single() - initialize a device with PV label and metadata area
  *
@@ -1444,6 +1526,7 @@ struct physical_volume * pvcreate_single
 	struct dm_list mdas;
 	struct pvcreate_params default_pp;
 	char buffer[64] __attribute((aligned(8)));
+	const char *oldsymlink;
 
 	pvcreate_params_set_defaults(&default_pp);
 	if (!pp)
@@ -1509,11 +1592,20 @@ struct physical_volume * pvcreate_single
 
 	log_very_verbose("Writing physical volume data to disk \"%s\"",
 			 pv_name);
+        oldsymlink = pv_symlink_handle(cmd, pv_name, 0);
+
 	if (!(pv_write(cmd, pv, &mdas, pp->labelsector))) {
 		log_error("Failed to write physical volume \"%s\"", pv_name);
+		if (oldsymlink) free(oldsymlink);
 		goto error;
 	}
 
+       pv_symlink_handle(cmd, pv_name, 1);
+       if (oldsymlink) {
+               unlink(oldsymlink);
+               free(oldsymlink);
+       }
+
 	log_print("Physical volume \"%s\" successfully created", pv_name);
 
 	return pv;

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File lvm-pv-create-link.diff of Package lvm2-clvm

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