LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2012-01-25 21:50:51

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Ensure whole info is initialised
	
	Since _create_dm_tree_node is copying whole structure,
	make sure all members are initialized.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.532&r2=1.533
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.152&r2=1.153

--- LVM2/WHATS_NEW_DM	2012/01/18 18:52:02	1.532
+++ LVM2/WHATS_NEW_DM	2012/01/25 21:50:50	1.533
@@ -1,5 +1,6 @@
 Version 1.02.68 -
 ==================================
+  Reset all members of info struct in dm_tree_add_new_dev_with_udev_flags.
   Add dmsetup wipe_table to replace table with one that uses error target.
   Add 'blkdevname' and 'blkdevs_used' field to dmsetup info -c -o.
   Add 'blkdevname' option to dmsetup ls --tree to see block device names.
--- LVM2/libdm/libdm-deptree.c	2012/01/25 08:46:21	1.152
+++ LVM2/libdm/libdm-deptree.c	2012/01/25 21:50:51	1.153
@@ -1101,12 +1101,7 @@
 			return NULL;
 		}
 
-		info.major = 0;
-		info.minor = 0;
-		info.exists = 0;
-		info.live_table = 0;
-		info.inactive_table = 0;
-		info.read_only = 0;
+		memset(&info, 0, sizeof(info));
 
 		if (!(dnode = _create_dm_tree_node(dtree, name2, uuid2, &info,
 						   context, 0)))

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[agk]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	agk@sourceware.org	2012-05-15 21:27:25

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Set delay_resume_if_new on deptree snapshot origin.
	(Must avoid activating snapshot origin more than once concurrently.)

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.601&r2=1.602
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.165&r2=1.166

--- LVM2/WHATS_NEW_DM	2012/05/08 14:31:44	1.601
+++ LVM2/WHATS_NEW_DM	2012/05/15 21:27:24	1.602
@@ -1,5 +1,6 @@
 Version 1.02.75 - 
 ================================
+  Set delay_resume_if_new on deptree snapshot origin.
   Log value chosen in _find_config_bool like other variable types do.
   Synchronize with dead of dmeventd.
   Rename (Blk)DevNames/DevNos dmsetup header to (Blk)DevNamesUsed/DevNosUsed.
--- LVM2/libdm/libdm-deptree.c	2012/05/15 20:03:12	1.165
+++ LVM2/libdm/libdm-deptree.c	2012/05/15 21:27:24	1.166
@@ -2358,8 +2358,10 @@
 	if ((r = dm_task_run(dmt))) {
 		r = dm_task_get_info(dmt, &dnode->info);
 		if (r && !dnode->info.inactive_table)
-			log_verbose("Suppressed %s identical table reload.",
-				    dnode->name);
+			log_verbose("Suppressed %s (%" PRIu32 ":%" PRIu32
+				    ") identical table reload.",
+				    dnode->name,
+				    dnode->info.major, dnode->info.minor);
 
 		existing_table_size = dm_task_get_existing_table_size(dmt);
 		if ((dnode->props.size_changed =
@@ -2548,6 +2550,12 @@
 	/* Resume snapshot origins after new snapshots */
 	dnode->activation_priority = 1;
 
+	/*
+	 * Don't resume the origin immediately in case it is a non-trivial 
+	 * target that must not be active more than once concurrently!
+	 */
+	origin_node->props.delay_resume_if_new = 1;
+
 	return 1;
 }
 

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2012-02-10 14:48:30

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Check for deps pointer before dererence
	
	As _deps() call may return NULL - check for it.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.547&r2=1.548
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.155&r2=1.156

--- LVM2/WHATS_NEW_DM	2012/02/10 14:42:28	1.547
+++ LVM2/WHATS_NEW_DM	2012/02/10 14:48:28	1.548
@@ -1,6 +1,7 @@
 Version 1.02.70 - 
 ===================================
-  Validate name and uuid params of dm_tree_add_new_dev_with_udev_flags().  
+  Add pointer test for dependency check in _add_dev().
+  Validate name and uuid params of dm_tree_add_new_dev_with_udev_flags().
   Do not crash for dm_report_init() sort_key == NULL and behave like "".
   Return error for failing allocation in dm_asprintf().
   Add missing test for failing allocation in dm_realloc() code.
--- LVM2/libdm/libdm-deptree.c	2012/02/10 14:42:28	1.155
+++ LVM2/libdm/libdm-deptree.c	2012/02/10 14:48:28	1.156
@@ -1180,7 +1180,7 @@
 		goto out;
 
 	/* Can't recurse if not a mapped device or there are no dependencies */
-	if (!node->info.exists || !deps->count) {
+	if (!node->info.exists || !deps || !deps->count) {
 		if (!_add_to_bottomlevel(node)) {
 			stack;
 			node = NULL;

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2012-02-10 14:42:29

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Add validation of name and uuid
	
	Do not accept NULL pointers.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.546&r2=1.547
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.154&r2=1.155

--- LVM2/WHATS_NEW_DM	2012/02/10 14:00:07	1.546
+++ LVM2/WHATS_NEW_DM	2012/02/10 14:42:28	1.547
@@ -1,5 +1,6 @@
 Version 1.02.70 - 
 ===================================
+  Validate name and uuid params of dm_tree_add_new_dev_with_udev_flags().  
   Do not crash for dm_report_init() sort_key == NULL and behave like "".
   Return error for failing allocation in dm_asprintf().
   Add missing test for failing allocation in dm_realloc() code.
--- LVM2/libdm/libdm-deptree.c	2012/02/08 11:36:18	1.154
+++ LVM2/libdm/libdm-deptree.c	2012/02/10 14:42:28	1.155
@@ -1086,6 +1086,11 @@
 	const char *name2;
 	const char *uuid2;
 
+	if (!name || !uuid) {
+		log_error("Cannot add device without name and uuid.");
+		return NULL;
+	}
+
 	/* Do we need to add node to tree? */
 	if (!(dnode = dm_tree_find_node_by_uuid(dtree, uuid))) {
 		if (!(name2 = dm_pool_strdup(dtree->mem, name))) {

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[mbroz]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	mbroz@sourceware.org	2011-10-17 13:15:35

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Fix alignment warning in bitcount calculation for raid segment.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.510&r2=1.511
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.123&r2=1.124

--- LVM2/WHATS_NEW_DM	2011/10/14 13:34:19	1.510
+++ LVM2/WHATS_NEW_DM	2011/10/17 13:15:35	1.511
@@ -1,5 +1,6 @@
 Version 1.02.68 -
 ==================================
+  Fix alignment warning in bitcount calculation for raid segment.
   Allocate dm_tree structure from dm_tree pool.
   Update debug logging for _resume_node.
   Add functions to support thin provisioning target (API unstable).
--- LVM2/libdm/libdm-deptree.c	2011/10/14 13:34:19	1.123
+++ LVM2/libdm/libdm-deptree.c	2011/10/17 13:15:35	1.124
@@ -1856,7 +1856,7 @@
 				   uint64_t *seg_start, char *params,
 				   size_t paramsize)
 {
-	uint32_t i, *tmp;
+	uint32_t i;
 	int param_count = 1; /* mandatory 'chunk size'/'stripe size' arg */
 	int pos = 0;
 
@@ -1866,9 +1866,9 @@
 	if (seg->region_size)
 		param_count += 2;
 
-	tmp = (uint32_t *)(&seg->rebuilds); /* rebuilds is 64-bit */
-	param_count += 2 * hweight32(tmp[0]);
-	param_count += 2 * hweight32(tmp[1]);
+	/* rebuilds is 64-bit */
+	param_count += 2 * hweight32(seg->rebuilds & 0xFFFFFFFF);
+	param_count += 2 * hweight32(seg->rebuilds >> 32);
 
 	if ((seg->type == SEG_RAID1) && seg->stripe_size)
 		log_error("WARNING: Ignoring RAID1 stripe size");

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2011-10-14 13:34:19

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Use pool for dm_tree allocation
	
	Using the same pool allocation strategy as we use for vg,
	so dm_tree structure is part of the pool itself.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.509&r2=1.510
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.122&r2=1.123

--- LVM2/WHATS_NEW_DM	2011/10/03 18:28:25	1.509
+++ LVM2/WHATS_NEW_DM	2011/10/14 13:34:19	1.510
@@ -1,5 +1,6 @@
 Version 1.02.68 -
 ==================================
+  Allocate dm_tree structure from dm_tree pool.
   Update debug logging for _resume_node.
   Add functions to support thin provisioning target (API unstable).
   Improve libdm-config error path reporting.
--- LVM2/libdm/libdm-deptree.c	2011/10/06 14:45:42	1.122
+++ LVM2/libdm/libdm-deptree.c	2011/10/14 13:34:19	1.123
@@ -248,10 +248,14 @@
 
 struct dm_tree *dm_tree_create(void)
 {
+	struct dm_pool *dmem;
 	struct dm_tree *dtree;
 
-	if (!(dtree = dm_zalloc(sizeof(*dtree)))) {
-		log_error("dm_tree_create malloc failed");
+	if (!(dmem = dm_pool_create("dtree", 1024)) ||
+	    !(dtree = dm_pool_zalloc(dmem, sizeof(*dtree)))) {
+		log_error("Failed to allocate dtree.");
+		if (dmem)
+			dm_pool_destroy(dmem);
 		return NULL;
 	}
 
@@ -260,17 +264,11 @@
 	dm_list_init(&dtree->root.used_by);
 	dtree->skip_lockfs = 0;
 	dtree->no_flush = 0;
-
-	if (!(dtree->mem = dm_pool_create("dtree", 1024))) {
-		log_error("dtree pool creation failed");
-		dm_free(dtree);
-		return NULL;
-	}
+	dtree->mem = dmem;
 
 	if (!(dtree->devs = dm_hash_create(8))) {
 		log_error("dtree hash creation failed");
 		dm_pool_destroy(dtree->mem);
-		dm_free(dtree);
 		return NULL;
 	}
 
@@ -278,7 +276,6 @@
 		log_error("dtree uuid hash creation failed");
 		dm_hash_destroy(dtree->devs);
 		dm_pool_destroy(dtree->mem);
-		dm_free(dtree);
 		return NULL;
 	}
 
@@ -293,7 +290,6 @@
 	dm_hash_destroy(dtree->uuids);
 	dm_hash_destroy(dtree->devs);
 	dm_pool_destroy(dtree->mem);
-	dm_free(dtree);
 }
 
 static int _nodes_are_linked(const struct dm_tree_node *parent,

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2011-10-03 18:28:26

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Update error path tracing for _resume_node
	
	dm_task_create & dm_task_set_name produces it's own log_error
	Add missing stacks for dm_task_set_cookie, dm_task_run,
	dm_task_get_info.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.508&r2=1.509
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.116&r2=1.117

--- LVM2/WHATS_NEW_DM	2011/09/29 08:53:48	1.508
+++ LVM2/WHATS_NEW_DM	2011/10/03 18:28:25	1.509
@@ -1,5 +1,6 @@
 Version 1.02.68 -
 ==================================
+  Update debug logging for _resume_node.
   Add functions to support thin provisioning target (API unstable).
   Improve libdm-config error path reporting.
   Update dmsetup resume man with --addnodeonresume/create options.
--- LVM2/libdm/libdm-deptree.c	2011/10/03 18:26:07	1.116
+++ LVM2/libdm/libdm-deptree.c	2011/10/03 18:28:25	1.117
@@ -1127,13 +1127,13 @@
 	log_verbose("Resuming %s (%" PRIu32 ":%" PRIu32 ")", name, major, minor);
 
 	if (!(dmt = dm_task_create(DM_DEVICE_RESUME))) {
-		log_error("Suspend dm_task creation failed for %s", name);
+		log_debug("Suspend dm_task creation failed for %s.", name);
 		return 0;
 	}
 
 	/* FIXME Kernel should fill in name on return instead */
 	if (!dm_task_set_name(dmt, name)) {
-		log_error("Failed to set readahead device name for %s", name);
+		log_debug("Failed to set device name for %s resumption.", name);
 		goto out;
 	}
 
@@ -1149,13 +1149,16 @@
 		log_error("Failed to set read ahead");
 
 	if (!dm_task_set_cookie(dmt, cookie, udev_flags))
-		goto out;
+		goto_out;
 
-	if ((r = dm_task_run(dmt))) {
-		if (already_suspended)
-			dec_suspended();
-		r = dm_task_get_info(dmt, newinfo);
-	}
+	if (!(r = dm_task_run(dmt)))
+		goto_out;
+
+	if (already_suspended)
+		dec_suspended();
+
+	if (!(r = dm_task_get_info(dmt, newinfo)))
+		stack;
 
 out:
 	dm_task_destroy(dmt);

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2011-09-07 08:37:48

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Remove unused passed parameters

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.497&r2=1.498
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.108&r2=1.109

--- LVM2/WHATS_NEW_DM	2011/09/01 21:04:14	1.497
+++ LVM2/WHATS_NEW_DM	2011/09/07 08:37:48	1.498
@@ -1,5 +1,6 @@
 Version 1.02.68 -
 ==================================
+  Remove unused passed parameters for _mirror_emit_segment_line().
   Add dm_config and string character escaping functions to libdevmapper.
   Mark unreleased memory pools as internal error.
 
--- LVM2/libdm/libdm-deptree.c	2011/08/19 17:02:48	1.108
+++ LVM2/libdm/libdm-deptree.c	2011/09/07 08:37:48	1.109
@@ -1594,10 +1594,8 @@
 /*
  * Returns: 1 on success, 0 on failure
  */
-static int _mirror_emit_segment_line(struct dm_task *dmt, uint32_t major,
-				     uint32_t minor, struct load_segment *seg,
-				     uint64_t *seg_start, char *params,
-				     size_t paramsize)
+static int _mirror_emit_segment_line(struct dm_task *dmt, struct load_segment *seg,
+				     char *params, size_t paramsize)
 {
 	int block_on_error = 0;
 	int handle_errors = 0;
@@ -1784,8 +1782,7 @@
 		break;
 	case SEG_MIRRORED:
 		/* Mirrors are pretty complicated - now in separate function */
-		r = _mirror_emit_segment_line(dmt, major, minor, seg, seg_start,
-					      params, paramsize);
+		r = _mirror_emit_segment_line(dmt, seg, params, paramsize);
 		if (!r)
 			return_0;
 		break;

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2011-02-18 16:13:57

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Add debug message for open_count failure
	
	Report  open_count problem as debug.
	
	Function using _node_has_closed_parents decides whether
	it's error or could be ignored.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.447&r2=1.448
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.89&r2=1.90

--- LVM2/WHATS_NEW_DM	2011/02/18 14:38:47	1.447
+++ LVM2/WHATS_NEW_DM	2011/02/18 16:13:56	1.448
@@ -1,5 +1,6 @@
 Version 1.02.64 - 
 ===================================
+  Log debug open_count in _node_has_closed_parents().
   Change dm_report_field_string() API to accept const char *const *data.
 
 Version 1.02.63 - 9th February 2011
--- LVM2/libdm/libdm-deptree.c	2010/11/29 12:42:10	1.89
+++ LVM2/libdm/libdm-deptree.c	2011/02/18 16:13:56	1.90
@@ -938,8 +938,11 @@
 		    !info.exists)
 			continue;
 
-		if (info.open_count)
+		if (info.open_count) {
+			log_debug("Node %s %d:%d has open_count %d", uuid_prefix,
+				  dinfo->major, dinfo->minor, info.open_count);
 			return 0;
+		}
 	}
 
 	return 1;

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[agk]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	agk@sourceware.org	2009-07-03 12:45:56

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Add device number to more log messages during activation.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.282&r2=1.283
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.51&r2=1.52

--- LVM2/WHATS_NEW_DM	2009/07/01 09:31:46	1.282
+++ LVM2/WHATS_NEW_DM	2009/07/03 12:45:55	1.283
@@ -1,5 +1,6 @@
 Version 1.02.34 - 
 ================================
+  Add device number to more log messages during activation.
 
 Version 1.02.33 - 30th June 2009
 ================================
--- LVM2/libdm/libdm-deptree.c	2009/06/09 16:10:25	1.51
+++ LVM2/libdm/libdm-deptree.c	2009/07/03 12:45:56	1.52
@@ -1263,7 +1263,10 @@
 	return 1;
 }
 
-static int _emit_segment_line(struct dm_task *dmt, struct load_segment *seg, uint64_t *seg_start, char *params, size_t paramsize)
+static int _emit_segment_line(struct dm_task *dmt, uint32_t major,
+			      uint32_t minor, struct load_segment *seg,
+			      uint64_t *seg_start, char *params,
+			      size_t paramsize)
 {
 	unsigned log_parm_count;
 	int pos = 0;
@@ -1362,7 +1365,8 @@
 		break;
 	}
 
-	log_debug("Adding target: %" PRIu64 " %" PRIu64 " %s %s",
+	log_debug("Adding target to (%" PRIu32 ":%" PRIu32 "): %" PRIu64
+		  " %" PRIu64 " %s %s", major, minor,
 		  *seg_start, seg->size, dm_segtypes[seg->type].target, params);
 
 	if (!dm_task_add_target(dmt, *seg_start, seg->size, dm_segtypes[seg->type].target, params))
@@ -1375,8 +1379,8 @@
 
 #undef EMIT_PARAMS
 
-static int _emit_segment(struct dm_task *dmt, struct load_segment *seg,
-			 uint64_t *seg_start)
+static int _emit_segment(struct dm_task *dmt, uint32_t major, uint32_t minor,
+			 struct load_segment *seg, uint64_t *seg_start)
 {
 	char *params;
 	size_t paramsize = 4096;
@@ -1389,7 +1393,8 @@
 		}
 
 		params[0] = '\0';
-		ret = _emit_segment_line(dmt, seg, seg_start, params, paramsize);
+		ret = _emit_segment_line(dmt, major, minor, seg, seg_start,
+					 params, paramsize);
 		dm_free(params);
 
 		if (!ret)
@@ -1415,7 +1420,8 @@
 	struct load_segment *seg;
 	uint64_t seg_start = 0;
 
-	log_verbose("Loading %s table", dnode->name);
+	log_verbose("Loading %s table (%" PRIu32 ":%" PRIu32 ")", dnode->name,
+		    dnode->info.major, dnode->info.minor);
 
 	if (!(dmt = dm_task_create(DM_DEVICE_RELOAD))) {
 		log_error("Reload dm_task creation failed for %s", dnode->name);
@@ -1437,7 +1443,8 @@
 		log_error("Failed to disable open_count");
 
 	dm_list_iterate_items(seg, &dnode->props.segs)
-		if (!_emit_segment(dmt, seg, &seg_start))
+		if (!_emit_segment(dmt, dnode->info.major, dnode->info.minor,
+				   seg, &seg_start))
 			goto_out;
 
 	if (!dm_task_suppress_identical_reload(dmt))

LVM2 ./WHATS_NEW_DM libdm/libdm-deptree.c

[zkabelac]

CVSROOT:	/cvs/lvm2
Module name:	LVM2
Changes by:	zkabelac@sourceware.org	2008-12-11 16:25:51

Modified files:
	.              : WHATS_NEW_DM 
	libdm          : libdm-deptree.c 

Log message:
	Replace _dm_snprintf with EMIT_PARAMS macro for creating target lines

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW_DM.diff?cvsroot=lvm2&r1=1.257&r2=1.258
http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/libdm/libdm-deptree.c.diff?cvsroot=lvm2&r1=1.47&r2=1.48

--- LVM2/WHATS_NEW_DM	2008/11/19 14:14:52	1.257
+++ LVM2/WHATS_NEW_DM	2008/12/11 16:25:51	1.258
@@ -1,5 +1,6 @@
 Version 1.02.30 -
 ====================================
+  Replace _dm_snprintf with EMIT_PARAMS macro for creating target lines
 
 Version 1.02.29 - 10th November 2008
 ====================================
--- LVM2/libdm/libdm-deptree.c	2008/11/04 15:07:45	1.47
+++ LVM2/libdm/libdm-deptree.c	2008/12/11 16:25:51	1.48
@@ -135,22 +135,6 @@
 	int no_flush;		/* 1 sets noflush (mirrors/multipath) */
 };
 
-/* FIXME Consider exporting this */
-static int _dm_snprintf(char *buf, size_t bufsize, const char *format, ...)
-{
-        int n;
-        va_list ap;
-
-        va_start(ap, format);
-        n = vsnprintf(buf, bufsize, format, ap);
-        va_end(ap);
-
-        if (n < 0 || (n > (int) bufsize - 1))
-                return -1;
-
-        return n;
-}
-
 struct dm_tree *dm_tree_create(void)
 {
 	struct dm_tree *dtree;
@@ -1238,27 +1222,32 @@
 	return 1;
 }
 
+/* simplify string emiting code */
+#define EMIT_PARAMS(p, str...)\
+	do {\
+		const size_t bufsize = paramsize - (size_t)p;\
+		int w;\
+		\
+		if ((w = snprintf(params + p, bufsize, str)) < 0\
+		    || ((size_t)w >= bufsize)) {\
+			stack; /* Out of space */\
+			return -1;\
+		}\
+		p += w;\
+	} while (0)
+
 static int _emit_areas_line(struct dm_task *dmt __attribute((unused)),
 			    struct load_segment *seg, char *params,
 			    size_t paramsize, int *pos)
 {
 	struct seg_area *area;
 	char devbuf[DM_FORMAT_DEV_BUFSIZE];
-	int tw;
-	const char *prefix = "";
 
 	dm_list_iterate_items(area, &seg->areas) {
 		if (!_build_dev_string(devbuf, sizeof(devbuf), area->dev_node))
 			return_0;
 
-		if ((tw = _dm_snprintf(params + *pos, paramsize - *pos, "%s%s %" PRIu64,
-					prefix, devbuf, area->offset)) < 0) {
-                        stack;	/* Out of space */
-                        return -1;
-                }
-
-		prefix = " ";
-		*pos += tw;
+		EMIT_PARAMS(*pos, " %s %" PRIu64, devbuf, area->offset);
 	}
 
 	return 1;
@@ -1267,9 +1256,8 @@
 static int _emit_segment_line(struct dm_task *dmt, struct load_segment *seg, uint64_t *seg_start, char *params, size_t paramsize)
 {
 	unsigned log_parm_count;
-        int pos = 0;
-	int tw;
-        int r;
+	int pos = 0;
+	int r;
 	char originbuf[DM_FORMAT_DEV_BUFSIZE], cowbuf[DM_FORMAT_DEV_BUFSIZE];
 	char logbuf[DM_FORMAT_DEV_BUFSIZE];
 	const char *logtype;
@@ -1289,11 +1277,7 @@
 		if (seg->clustered) {
 			if (seg->uuid)
 				log_parm_count++;
-			if ((tw = _dm_snprintf(params + pos, paramsize - pos, "clustered-")) < 0) {
-                        	stack;	/* Out of space */
-                        	return -1;
-                	}
-			pos += tw;
+			EMIT_PARAMS(pos, "clustered-");
 		}
 
 		if (!seg->log)
@@ -1305,61 +1289,25 @@
 				return_0;
 		}
 
-		if ((tw = _dm_snprintf(params + pos, paramsize - pos, "%s %u ", logtype, log_parm_count)) < 0) {
-                        stack;	/* Out of space */
-                        return -1;
-                }
-		pos += tw;
-
-		if (seg->log) {
-			if ((tw = _dm_snprintf(params + pos, paramsize - pos, "%s ", logbuf)) < 0) {
-                        	stack;	/* Out of space */
-                        	return -1;
-                	}
-			pos += tw;
-		}
-
-		if ((tw = _dm_snprintf(params + pos, paramsize - pos, "%u ", seg->region_size)) < 0) {
-                       	stack; /* Out of space */
-                       	return -1;
-               	}
-		pos += tw;
-
-		if (seg->clustered && seg->uuid) {
-			if ((tw = _dm_snprintf(params + pos, paramsize - pos, "%s ", seg->uuid)) < 0) {
-				stack;  /* Out of space */
-				return -1;
-			}
-			pos += tw;
-		}
+		EMIT_PARAMS(pos, "%s %u", logtype, log_parm_count);
+
+		if (seg->log)
+			EMIT_PARAMS(pos, " %s", logbuf);
+
+		EMIT_PARAMS(pos, " %u", seg->region_size);
 
-		if ((seg->flags & DM_NOSYNC)) {
-			if ((tw = _dm_snprintf(params + pos, paramsize - pos, "nosync ")) < 0) {
-                       		stack; /* Out of space */
-                       		return -1;
-               		}
-			pos += tw;
-		} else if ((seg->flags & DM_FORCESYNC)) {
-			if ((tw = _dm_snprintf(params + pos, paramsize - pos, "sync ")) < 0) {
-                       		stack; /* Out of space */
-                       		return -1;
-               		}
-			pos += tw;
-		}
-
-		if ((seg->flags & DM_BLOCK_ON_ERROR)) {
-			if ((tw = _dm_snprintf(params + pos, paramsize - pos, "block_on_error ")) < 0) {
-                       		stack; /* Out of space */
-                       		return -1;
-               		}
-			pos += tw;
-		}
-
-		if ((tw = _dm_snprintf(params + pos, paramsize - pos, "%u ", seg->mirror_area_count)) < 0) {
-                       	stack; /* Out of space */
-                       	return -1;
-               	}
-		pos += tw;
+		if (seg->clustered && seg->uuid)
+			EMIT_PARAMS(pos, " %s", seg->uuid);
+
+		if ((seg->flags & DM_NOSYNC))
+			EMIT_PARAMS(pos, " nosync");
+		else if ((seg->flags & DM_FORCESYNC))
+			EMIT_PARAMS(pos, " sync");
+
+		if ((seg->flags & DM_BLOCK_ON_ERROR))
+			EMIT_PARAMS(pos, " block_on_error");
+
+		EMIT_PARAMS(pos, " %u", seg->mirror_area_count);
 
 		break;
 	case SEG_SNAPSHOT:
@@ -1367,30 +1315,16 @@
 			return_0;
 		if (!_build_dev_string(cowbuf, sizeof(cowbuf), seg->cow))
 			return_0;
-		if ((pos = _dm_snprintf(params, paramsize, "%s %s %c %d",
-                                        originbuf, cowbuf,
-					seg->persistent ? 'P' : 'N',
-                                        seg->chunk_size)) < 0) {
-                        stack;	/* Out of space */
-                        return -1;
-                }
+		EMIT_PARAMS(pos, "%s %s %c %d", originbuf, cowbuf,
+			    seg->persistent ? 'P' : 'N', seg->chunk_size);
 		break;
 	case SEG_SNAPSHOT_ORIGIN:
 		if (!_build_dev_string(originbuf, sizeof(originbuf), seg->origin))
 			return_0;
-		if ((pos = _dm_snprintf(params, paramsize, "%s",
-                                        originbuf)) < 0) {
-                        stack;	/* Out of space */
-                        return -1;
-                }
+		EMIT_PARAMS(pos, "%s", originbuf);
 		break;
 	case SEG_STRIPED:
-		if ((pos = _dm_snprintf(params, paramsize, "%u %u ",
-                                         seg->area_count,
-                                         seg->stripe_size)) < 0) {
-                        stack;	/* Out of space */
-                        return -1;
-                }
+		EMIT_PARAMS(pos, "%u %u", seg->area_count, seg->stripe_size);
 		break;
 	}
 
@@ -1421,6 +1355,8 @@
 	return 1;
 }
 
+#undef EMIT_PARAMS
+
 static int _emit_segment(struct dm_task *dmt, struct load_segment *seg,
 			 uint64_t *seg_start)
 {