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Target/file: place escape values for protection information format 

No need to actually compute protection information when formatting

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sagi Grimberg 2014-02-19 17:50:16 +02:00 committed by Nicholas Bellinger
parent 19f9361af7
commit 80dcd0c104
1 changed files with 1 additions and 39 deletions
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40
drivers/target/target_core_file.c
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@ -854,25 +854,6 @@ static int fd_init_prot(struct se_device *dev)
return 0;
}
static void fd_init_format_buf(struct se_device *dev, unsigned char *buf,
u32 unit_size, u32 *ref_tag, u16 app_tag,
bool inc_reftag)
{
unsigned char *p = buf;
int i;
for (i = 0; i < unit_size; i += dev->prot_length) {
*((u16 *)&p[0]) = 0xffff;
*((__be16 *)&p[2]) = cpu_to_be16(app_tag);
*((__be32 *)&p[4]) = cpu_to_be32(*ref_tag);
if (inc_reftag)
(*ref_tag)++;
p += dev->prot_length;
}
}
static int fd_format_prot(struct se_device *dev)
{
struct fd_dev *fd_dev = FD_DEV(dev);
@ -880,10 +861,8 @@ static int fd_format_prot(struct se_device *dev)
sector_t prot_length, prot;
unsigned char *buf;
loff_t pos = 0;
u32 ref_tag = 0;
int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
int rc, ret = 0, size, len;
bool inc_reftag = false;
if (!dev->dev_attrib.pi_prot_type) {
pr_err("Unable to format_prot while pi_prot_type == 0\n");
@ -894,37 +873,20 @@ static int fd_format_prot(struct se_device *dev)
return -ENODEV;
}
switch (dev->dev_attrib.pi_prot_type) {
case TARGET_DIF_TYPE3_PROT:
ref_tag = 0xffffffff;
break;
case TARGET_DIF_TYPE2_PROT:
case TARGET_DIF_TYPE1_PROT:
inc_reftag = true;
break;
default:
break;
}
buf = vzalloc(unit_size);
if (!buf) {
pr_err("Unable to allocate FILEIO prot buf\n");
return -ENOMEM;
}
prot_length = (dev->transport->get_blocks(dev) + 1) * dev->prot_length;
size = prot_length;
pr_debug("Using FILEIO prot_length: %llu\n",
(unsigned long long)prot_length);
memset(buf, 0xff, unit_size);
for (prot = 0; prot < prot_length; prot += unit_size) {
fd_init_format_buf(dev, buf, unit_size, &ref_tag, 0xffff,
inc_reftag);
len = min(unit_size, size);
rc = kernel_write(prot_fd, buf, len, pos);
if (rc != len) {
pr_err("vfs_write to prot file failed: %d\n", rc);