2.6.0-test5-mm2 Device Mapper Patches

2.6.0-test5-mm2 Device Mapper Patches

[Kevin Corry]

A handful of minor fixes for Device-Mapper. Joe Thornber asked me to forward 
these on while he is changing internet connections.

-- 
Kevin Corry
kevcorry@us.ibm.com
http://evms.sourceforge.net/

[PATCH] DM 1/6: Use new format_dev_t macro

[Kevin Corry]

Use the format_dev_t function for target status functions.

--- diff/drivers/md/dm-linear.c	2003-06-30 10:07:21.000000000 +0100
+++ source/drivers/md/dm-linear.c	2003-09-17 13:08:44.000000000 +0100
@@ -79,7 +79,7 @@
 			 char *result, unsigned int maxlen)
 {
 	struct linear_c *lc = (struct linear_c *) ti->private;
-	char b[BDEVNAME_SIZE];
+	char buffer[32];
 
 	switch (type) {
 	case STATUSTYPE_INFO:
@@ -87,8 +87,8 @@
 		break;
 
 	case STATUSTYPE_TABLE:
-		snprintf(result, maxlen, "%s " SECTOR_FORMAT,
-			 bdevname(lc->dev->bdev, b), lc->start);
+		format_dev_t(buffer, lc->dev->bdev->bd_dev);
+		snprintf(result, maxlen, "%s " SECTOR_FORMAT, buffer, lc->start);
 		break;
 	}
 	return 0;
--- diff/drivers/md/dm-stripe.c	2003-08-20 14:16:28.000000000 +0100
+++ source/drivers/md/dm-stripe.c	2003-09-17 13:08:44.000000000 +0100
@@ -187,7 +187,7 @@
 	struct stripe_c *sc = (struct stripe_c *) ti->private;
 	int offset;
 	unsigned int i;
-	char b[BDEVNAME_SIZE];
+	char buffer[32];
 
 	switch (type) {
 	case STATUSTYPE_INFO:
@@ -198,10 +198,10 @@
 		offset = snprintf(result, maxlen, "%d " SECTOR_FORMAT,
 				  sc->stripes, sc->chunk_mask + 1);
 		for (i = 0; i < sc->stripes; i++) {
+			format_dev_t(buffer, sc->stripe[i].dev->bdev->bd_dev);
 			offset +=
 			    snprintf(result + offset, maxlen - offset,
-				     " %s " SECTOR_FORMAT,
-		       bdevname(sc->stripe[i].dev->bdev, b),
+				     " %s " SECTOR_FORMAT, buffer,
 				     sc->stripe[i].physical_start);
 		}
 		break;

[PATCH] DM 2/6: Drop extra table ref-count

[Kevin Corry]

When multiple load ioctls are issued the reference count on older
'new_tables' wasn't being dropped.  [Christophe Saout]

--- diff/drivers/md/dm-ioctl-v4.c	2003-09-17 12:28:06.000000000 +0100
+++ source/drivers/md/dm-ioctl-v4.c	2003-09-17 13:08:53.000000000 +0100
@@ -817,6 +817,8 @@
 		return -ENXIO;
 	}
 
+	if (hc->new_map)
+		dm_table_put(hc->new_map);
 	hc->new_map = t;
 	param->flags |= DM_INACTIVE_PRESENT_FLAG;
 

[PATCH] DM 3/6: Move retrieve_status function

[Kevin Corry]

Move retrieve_status up so dev_wait() can use it.

--- diff/drivers/md/dm-ioctl-v4.c	2003-09-17 13:08:53.000000000 +0100
+++ source/drivers/md/dm-ioctl-v4.c	2003-09-17 13:09:04.000000000 +0100
@@ -700,6 +700,69 @@
 }
 
 /*
+ * Build up the status struct for each target
+ */
+static void retrieve_status(struct dm_table *table,
+			    struct dm_ioctl *param, size_t param_size)
+{
+	unsigned int i, num_targets;
+	struct dm_target_spec *spec;
+	char *outbuf, *outptr;
+	status_type_t type;
+	size_t remaining, len, used = 0;
+
+	outptr = outbuf = get_result_buffer(param, param_size, &len);
+
+	if (param->flags & DM_STATUS_TABLE_FLAG)
+		type = STATUSTYPE_TABLE;
+	else
+		type = STATUSTYPE_INFO;
+
+	/* Get all the target info */
+	num_targets = dm_table_get_num_targets(table);
+	for (i = 0; i < num_targets; i++) {
+		struct dm_target *ti = dm_table_get_target(table, i);
+
+		remaining = len - (outptr - outbuf);
+		if (remaining < sizeof(struct dm_target_spec)) {
+			param->flags |= DM_BUFFER_FULL_FLAG;
+			break;
+		}
+
+		spec = (struct dm_target_spec *) outptr;
+
+		spec->status = 0;
+		spec->sector_start = ti->begin;
+		spec->length = ti->len;
+		strncpy(spec->target_type, ti->type->name,
+			sizeof(spec->target_type));
+
+		outptr += sizeof(struct dm_target_spec);
+		remaining = len - (outptr - outbuf);
+
+		/* Get the status/table string from the target driver */
+		if (ti->type->status) {
+			if (ti->type->status(ti, type, outptr, remaining)) {
+				param->flags |= DM_BUFFER_FULL_FLAG;
+				break;
+			}
+		} else
+			outptr[0] = '\0';
+
+		outptr += strlen(outptr) + 1;
+		used = param->data_start + (outptr - outbuf);
+
+		align_ptr(outptr);
+		spec->next = outptr - outbuf;
+	}
+
+	if (used)
+		param->data_size = used;
+
+	param->target_count = num_targets;
+}
+
+/*
  * Wait for a device to report an event
  */
 static int dev_wait(struct dm_ioctl *param, size_t param_size)
@@ -920,69 +983,6 @@
 }
 
 /*
- * Build up the status struct for each target
- */
-static void retrieve_status(struct dm_table *table,
-			    struct dm_ioctl *param, size_t param_size)
-{
-	unsigned int i, num_targets;
-	struct dm_target_spec *spec;
-	char *outbuf, *outptr;
-	status_type_t type;
-	size_t remaining, len, used = 0;
-
-	outptr = outbuf = get_result_buffer(param, param_size, &len);
-
-	if (param->flags & DM_STATUS_TABLE_FLAG)
-		type = STATUSTYPE_TABLE;
-	else
-		type = STATUSTYPE_INFO;
-
-	/* Get all the target info */
-	num_targets = dm_table_get_num_targets(table);
-	for (i = 0; i < num_targets; i++) {
-		struct dm_target *ti = dm_table_get_target(table, i);
-
-		remaining = len - (outptr - outbuf);
-		if (remaining < sizeof(struct dm_target_spec)) {
-			param->flags |= DM_BUFFER_FULL_FLAG;
-			break;
-		}
-
-		spec = (struct dm_target_spec *) outptr;
-
-		spec->status = 0;
-		spec->sector_start = ti->begin;
-		spec->length = ti->len;
-		strncpy(spec->target_type, ti->type->name,
-			sizeof(spec->target_type));
-
-		outptr += sizeof(struct dm_target_spec);
-		remaining = len - (outptr - outbuf);
-
-		/* Get the status/table string from the target driver */
-		if (ti->type->status) {
-			if (ti->type->status(ti, type, outptr, remaining)) {
-				param->flags |= DM_BUFFER_FULL_FLAG;
-				break;
-			}
-		} else
-			outptr[0] = '\0';
-
-		outptr += strlen(outptr) + 1;
-		used = param->data_start + (outptr - outbuf);
-
-		align_ptr(outptr);
-		spec->next = outptr - outbuf;
-	}
-
-	if (used)
-		param->data_size = used;
-
-	param->target_count = num_targets;
-}
-
-/*
  * Return the status of a device as a text string for each
  * target.
  */

[PATCH] DM 4/6: Return table status for dev_wait

[Kevin Corry]

dev_wait was meant to return table status not dev status.  [Alasdair Kergon]

--- diff/drivers/md/dm-ioctl-v4.c	2003-09-17 13:09:04.000000000 +0100
+++ source/drivers/md/dm-ioctl-v4.c	2003-09-17 13:09:26.000000000 +0100
@@ -769,6 +769,7 @@
 {
 	int r;
 	struct mapped_device *md;
+	struct dm_table *table;
 	DECLARE_WAITQUEUE(wq, current);
 
 	md = find_device(param);
@@ -791,7 +792,16 @@
 	 * him and save an ioctl.
 	 */
 	r = __dev_status(md, param);
+	if (r)
+		goto out;
+
+	table = dm_get_table(md);
+	if (table) {
+		retrieve_status(table, param, param_size);
+		dm_table_put(table);
+	}
 
+ out:
 	dm_put(md);
 	return r;
 }

[PATCH] DM 5/6: Message fix in dm-linear

[Kevin Corry]

Fix error message when linear targets gets handed more than 2 arguments.
[Alasdair Kergon]

--- diff/drivers/md/dm-linear.c	2003-09-17 13:08:44.000000000 +0100
+++ source/drivers/md/dm-linear.c	2003-09-17 13:09:34.000000000 +0100
@@ -28,7 +28,7 @@
 	struct linear_c *lc;
 
 	if (argc != 2) {
-		ti->error = "dm-linear: Not enough arguments";
+		ti->error = "dm-linear: Invalid argument count";
 		return -EINVAL;
 	}
 

[PATCH] DM 6/6: Support arbitrary number of target params

[Kevin Corry]

Support an arbitrary number of target parameters.  [Alasdair Kergon]

--- diff/drivers/md/dm-table.c	2003-09-17 12:28:06.000000000 +0100
+++ source/drivers/md/dm-table.c	2003-09-17 13:09:41.000000000 +0100
@@ -534,12 +534,36 @@
 }
 
 /*
+ * Used to dynamically allocate the arg array.
+ */
+static char **realloc_argv(unsigned *array_size, char **old_argv)
+{
+	char **argv;
+	unsigned new_size;
+
+	new_size = *array_size ? *array_size * 2 : 64;
+	argv = kmalloc(new_size * sizeof(*argv), GFP_KERNEL);
+	if (argv) {
+		memcpy(argv, old_argv, *array_size * sizeof(*argv));
+		*array_size = new_size;
+	}
+
+	kfree(old_argv);
+	return argv;
+}
+
+/*
  * Destructively splits up the argument list to pass to ctr.
  */
-static int split_args(int max, int *argc, char **argv, char *input)
+static int split_args(int *argc, char ***argvp, char *input)
 {
-	char *start, *end = input, *out;
+	char *start, *end = input, *out, **argv = NULL;
+	unsigned array_size = 0;
+
 	*argc = 0;
+	argv = realloc_argv(&array_size, argv);
+	if (!argv)
+		return -ENOMEM;
 
 	while (1) {
 		start = end;
@@ -568,8 +592,11 @@
 		}
 
 		/* have we already filled the array ? */
-		if ((*argc + 1) > max)
-			return -EINVAL;
+		if ((*argc + 1) > array_size) {
+			argv = realloc_argv(&array_size, argv);
+			if (!argv)
+				return -ENOMEM;
+		}
 
 		/* we know this is whitespace */
 		if (*end)
@@ -581,6 +608,7 @@
 		(*argc)++;
 	}
 
+	*argvp = argv;
 	return 0;
 }
 
@@ -588,7 +616,7 @@
 			sector_t start, sector_t len, char *params)
 {
 	int r = -EINVAL, argc;
-	char *argv[32];
+	char **argv;
 	struct dm_target *tgt;
 
 	if ((r = check_space(t)))
@@ -617,13 +645,14 @@
 		goto bad;
 	}
 
-	r = split_args(ARRAY_SIZE(argv), &argc, argv, params);
+	r = split_args(&argc, &argv, params);
 	if (r) {
-		tgt->error = "couldn't split parameters";
+		tgt->error = "couldn't split parameters (insufficient memory)";
 		goto bad;
 	}
 
 	r = tgt->type->ctr(tgt, argc, argv);
+	kfree(argv);
 	if (r)
 		goto bad;
 

Re: [PATCH] DM 1/6: Use new format_dev_t macro

[viro]

On Mon, Sep 22, 2003 at 10:51:27AM -0500, Kevin Corry wrote:
> Use the format_dev_t function for target status functions.

[instead of bdevname, that is]

It's wrong.  Simply because "sdb3" is immediately parsed by admin and
08:13 is nowhere near that convenient.  These are error messages, let's
keep them readable.

Re: [PATCH] DM 1/6: Use new format_dev_t macro

[Joe Thornber]

On Monday, September 22, 2003, at 08:29 PM, 
viro@parcelfarce.linux.theplanet.co.uk wrote:

> On Mon, Sep 22, 2003 at 10:51:27AM -0500, Kevin Corry wrote:
>> Use the format_dev_t function for target status functions.
>
> [instead of bdevname, that is]
>
> It's wrong.  Simply because "sdb3" is immediately parsed by admin and
> 08:13 is nowhere near that convenient.  These are error messages, let's
> keep them readable.
>
>

No they are not just error messages, userland tools use them.

- Joe

Re: [PATCH] DM 1/6: Use new format_dev_t macro

[viro]

On Tue, Sep 23, 2003 at 08:57:07AM +0100, Joe Thornber wrote:
> 
> On Monday, September 22, 2003, at 08:29 PM, 
> viro@parcelfarce.linux.theplanet.co.uk wrote:
> 
> >On Mon, Sep 22, 2003 at 10:51:27AM -0500, Kevin Corry wrote:
> >>Use the format_dev_t function for target status functions.
> >
> >[instead of bdevname, that is]
> >
> >It's wrong.  Simply because "sdb3" is immediately parsed by admin and
> >08:13 is nowhere near that convenient.  These are error messages, let's
> >keep them readable.
> >
> >
> 
> No they are not just error messages, userland tools use them.

In which case the change in question would break said userland tools, wouldn't
it?

Re: [PATCH] DM 1/6: Use new format_dev_t macro

[Kevin Corry]

On Tuesday 23 September 2003 02:57, viro@parcelfarce.linux.theplanet.co.uk 
wrote:
> On Tue, Sep 23, 2003 at 08:57:07AM +0100, Joe Thornber wrote:
> > On Monday, September 22, 2003, at 08:29 PM,
> >
> > viro@parcelfarce.linux.theplanet.co.uk wrote:
> > >On Mon, Sep 22, 2003 at 10:51:27AM -0500, Kevin Corry wrote:
> > >>Use the format_dev_t function for target status functions.
> > >
> > >[instead of bdevname, that is]
> > >
> > >It's wrong.  Simply because "sdb3" is immediately parsed by admin and
> > >08:13 is nowhere near that convenient.  These are error messages, let's
> > >keep them readable.
> >
> > No they are not just error messages, userland tools use them.
>
> In which case the change in question would break said userland tools,
> wouldn't it?

No, actually this change brings the status info back in-line with how the 2.4 
version of DM behaves. A while back the bdevname() function changed to return 
a text name (it used to return a major:minor, similar to kdevname in 2.4). In 
many cases the only way to make any sense of this text name is to search 
around in sysfs for a matching entry (provided, of course, that sysfs is 
mounted, which many people still don't realize they should be doing. :) And 
if you find that entry in sysfs, the info you're really looking for is in the 
"dev" file, whose contents are displayed using format_dev_t().

-- 
Kevin Corry
kevcorry@us.ibm.com
http://evms.sourceforge.net/