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target/rd: Refactor rd_build_device_space + rd_release_device_space

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This patch refactors rd_build_device_space() + rd_release_device_space()
into rd_allocate_sgl_table() + rd_release_device_space() so that they
may be used seperatly for setup + release of protection information
scatterlists.

Also add explicit memset of pages within rd_allocate_sgl_table() based
upon passed 'init_payload' value.

v2 changes:
  - Drop unused sg_table from rd_release_device_space (Wei)

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2014-01-07 22:40:27 +00:00
parent 42201b5574
commit 4442dc8a92
1 changed files with 68 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

113
drivers/target/target_core_rd.c
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@ -78,23 +78,14 @@ static void rd_detach_hba(struct se_hba *hba)
hba->hba_ptr = NULL;
}
/* rd_release_device_space():
*
*
*/
static void rd_release_device_space(struct rd_dev *rd_dev)
static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
u32 sg_table_count)
{
u32 i, j, page_count = 0, sg_per_table;
struct rd_dev_sg_table *sg_table;
struct page *pg;
struct scatterlist *sg;
u32 i, j, page_count = 0, sg_per_table;
if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
return;
sg_table = rd_dev->sg_table_array;
for (i = 0; i < rd_dev->sg_table_count; i++) {
for (i = 0; i < sg_table_count; i++) {
sg = sg_table[i].sg_table;
sg_per_table = sg_table[i].rd_sg_count;
@ -105,16 +96,28 @@ static void rd_release_device_space(struct rd_dev *rd_dev)
page_count++;
}
}
kfree(sg);
}
kfree(sg_table);
return page_count;
}
static void rd_release_device_space(struct rd_dev *rd_dev)
{
u32 page_count;
if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
return;
page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array,
rd_dev->sg_table_count);
pr_debug("CORE_RD[%u] - Released device space for Ramdisk"
" Device ID: %u, pages %u in %u tables total bytes %lu\n",
rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
kfree(sg_table);
rd_dev->sg_table_array = NULL;
rd_dev->sg_table_count = 0;
}
@ -124,38 +127,15 @@ static void rd_release_device_space(struct rd_dev *rd_dev)
*
*
*/
static int rd_build_device_space(struct rd_dev *rd_dev)
static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
u32 total_sg_needed, unsigned char init_payload)
{
u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed;
u32 i = 0, j, page_offset = 0, sg_per_table;
u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
sizeof(struct scatterlist));
struct rd_dev_sg_table *sg_table;
struct page *pg;
struct scatterlist *sg;
if (rd_dev->rd_page_count <= 0) {
pr_err("Illegal page count: %u for Ramdisk device\n",
rd_dev->rd_page_count);
return -EINVAL;
}
/* Don't need backing pages for NULLIO */
if (rd_dev->rd_flags & RDF_NULLIO)
return 0;
total_sg_needed = rd_dev->rd_page_count;
sg_tables = (total_sg_needed / max_sg_per_table) + 1;
sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
if (!sg_table) {
pr_err("Unable to allocate memory for Ramdisk"
" scatterlist tables\n");
return -ENOMEM;
}
rd_dev->sg_table_array = sg_table;
rd_dev->sg_table_count = sg_tables;
unsigned char *p;
while (total_sg_needed) {
sg_per_table = (total_sg_needed > max_sg_per_table) ?
@ -186,16 +166,59 @@ static int rd_build_device_space(struct rd_dev *rd_dev)
}
sg_assign_page(&sg[j], pg);
sg[j].length = PAGE_SIZE;
p = kmap(pg);
memset(p, init_payload, PAGE_SIZE);
kunmap(pg);
}
page_offset += sg_per_table;
total_sg_needed -= sg_per_table;
}
return 0;
}
static int rd_build_device_space(struct rd_dev *rd_dev)
{
struct rd_dev_sg_table *sg_table;
u32 sg_tables, total_sg_needed;
u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
sizeof(struct scatterlist));
int rc;
if (rd_dev->rd_page_count <= 0) {
pr_err("Illegal page count: %u for Ramdisk device\n",
rd_dev->rd_page_count);
return -EINVAL;
}
/* Don't need backing pages for NULLIO */
if (rd_dev->rd_flags & RDF_NULLIO)
return 0;
total_sg_needed = rd_dev->rd_page_count;
sg_tables = (total_sg_needed / max_sg_per_table) + 1;
sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
if (!sg_table) {
pr_err("Unable to allocate memory for Ramdisk"
" scatterlist tables\n");
return -ENOMEM;
}
rd_dev->sg_table_array = sg_table;
rd_dev->sg_table_count = sg_tables;
rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00);
if (rc)
return rc;
pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
rd_dev->rd_dev_id, rd_dev->rd_page_count,
rd_dev->sg_table_count);
" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
rd_dev->rd_dev_id, rd_dev->rd_page_count,
rd_dev->sg_table_count);
return 0;
}