Re: [PATCH 4/5] disk: introduce partition name

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

On 21:51 Thu 14 Feb     , Sascha Hauer wrote:
> On Thu, Feb 14, 2013 at 04:52:26PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > so we can register partion with name as present in EFI GPT
> > 
> > Cc: Rob Herring <rob.herring@calxeda.com>
> > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> > ---
> >  common/partitions.c        |   51 ++++++++++++++++++++++++++++++++++----------
> >  common/partitions/parser.h |    2 ++
> >  2 files changed, 42 insertions(+), 11 deletions(-)
> > 
> > diff --git a/common/partitions.c b/common/partitions.c
> > index 7cb8399..51a0fc2 100644
> > --- a/common/partitions.c
> > +++ b/common/partitions.c
> > @@ -44,15 +44,42 @@ LIST_HEAD(partition_parser_list);
> >  static int register_one_partition(struct block_device *blk,
> >  					struct partition *part, int no)
> >  {
> > -	char partition_name[19];
> > +	char *partition_name;
> > +	int ret;
> > +	uint64_t start = part->first_sec * SECTOR_SIZE;
> > +	uint64_t size = part->size * SECTOR_SIZE;
> > +
> > +	partition_name = asprintf("%s.%d", blk->cdev.name, no);
> > +	if (!partition_name)
> > +		return -ENOMEM;
> > +	dev_dbg(blk->dev, "Registering partition %s on drive %s\n",
> > +				partition_name, blk->cdev.name);
> > +	ret = devfs_add_partition(blk->cdev.name,
> > +				start, size, 0, partition_name);
> > +	if (ret)
> > +		goto out;
> > +
> > +	free(partition_name);
> > +	partition_name = asprintf("%s.%s", blk->cdev.name, part->name);
> > +	if (!partition_name) {
> > +		dev_warn(blk->dev, "Registering partition %s on drive %s failled\n",
> > +				part->name, blk->cdev.name);
> 
> You are in -ENOMEM here, not in partitiion register fai*l*ed.
> 
> > +		return 0;
> > +	}
> >  
> > -	sprintf(partition_name, "%s.%d", blk->cdev.name, no);
> >  	dev_dbg(blk->dev, "Registering partition %s on drive %s\n",
> >  				partition_name, blk->cdev.name);
> > -	return devfs_add_partition(blk->cdev.name,
> > -				part->first_sec * SECTOR_SIZE,
> > -				part->size * SECTOR_SIZE,
> > -				0, partition_name);
> > +	ret = devfs_add_partition(blk->cdev.name,
> > +				start, size, 0, partition_name);
> > +
> > +	if (ret)
> > +		dev_warn(blk->dev, "Registering partition %s on drive %s failled\n",
> > +				partition_name, blk->cdev.name);
> > +
> > +	ret = 0;
> > +out:
> > +	free(partition_name);
> > +	return 0;
> >  }
> >  
> >  static struct partition_parser *partition_parser_get_by_filetype(uint8_t *buf)
> > @@ -79,12 +106,13 @@ static struct partition_parser *partition_parser_get_by_filetype(uint8_t *buf)
> >   */
> >  int parse_partition_table(struct block_device *blk)
> 
> The changes to this function seem unrelated to the topic of this patch.
> 
> >  {
> > -	struct partition_desc pdesc = { .used_entries = 0, };
> > +	struct partition_desc *pdesc;
> >  	int i;
> >  	int rc = 0;
> >  	struct partition_parser *parser;
> >  	uint8_t *buf;
> >  
> > +	pdesc = xzalloc(sizeof(*pdesc));
> >  	buf = dma_alloc(SECTOR_SIZE * 2);
> >  
> >  	rc = blk->ops->read(blk, buf, 0, 2);
> > @@ -97,14 +125,14 @@ int parse_partition_table(struct block_device *blk)
> >  	if (!parser)
> >  		goto on_error;
> >  
> > -	parser->parse(buf, blk, &pdesc);
> > +	parser->parse(buf, blk, pdesc);
> >  
> > -	if (!pdesc.used_entries)
> > +	if (!pdesc->used_entries)
> >  		return 0;
> 
> You lose memory here.
> 
> >  
> >  	/* at least one partition description found */
> > -	for (i = 0; i < pdesc.used_entries; i++) {
> > -		rc = register_one_partition(blk, &pdesc.parts[i], i);
> > +	for (i = 0; i < pdesc->used_entries; i++) {
> > +		rc = register_one_partition(blk, &pdesc->parts[i], i);
> >  		if (rc != 0)
> >  			dev_err(blk->dev,
> >  				"Failed to register partition %d on %s (%d)\n",
> > @@ -115,6 +143,7 @@ int parse_partition_table(struct block_device *blk)
> >  
> >  on_error:
> >  	dma_free(buf);
> > +	free(pdesc);
> >  	return rc;
> >  }
> >  
> > diff --git a/common/partitions/parser.h b/common/partitions/parser.h
> > index 61b1cf5..083c143 100644
> > --- a/common/partitions/parser.h
> > +++ b/common/partitions/parser.h
> > @@ -12,8 +12,10 @@
> >  #include <linux/list.h>
> >  
> >  #define MAX_PARTITION		8
> > +#define MAX_PARTITION_NAME	38
> >  
> >  struct partition {
> > +	char name[MAX_PARTITION_NAME];
> 
> is this used?
yes by efi

in GPT you have a partname so you will have this

     `---- ffe08000.sata
          `---- 0x00000000-0x3fffffff: /dev/ata0
          `---- 0x00100000-0x063fffff: /dev/ata0.0
          `---- 0x00100000-0x063fffff: /dev/ata0.boot
          `---- 0x06400000-0x3fefffff: /dev/ata0.1
          `---- 0x06400000-0x3fefffff: /dev/ata0.root

so you do not care where is the boot partition just that the partition exist

and just mount root as rootfs

Best Regards,
J.
> 
> Sascha
> 
> -- 
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