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target: Fix PR_APTPL_BUF_LEN buffer size limitation 

This patch addresses the original PR_APTPL_BUF_LEN = 8k limitiation
for write-out of PR APTPL metadata that Martin has recently been
running into.

It changes core_scsi3_update_and_write_aptpl() to use vzalloc'ed
memory instead of kzalloc, and increases the default hardcoded
length to 256k.

It also adds logic in core_scsi3_update_and_write_aptpl() to double
the original length upon core_scsi3_update_aptpl_buf() failure, and
retries until the vzalloc'ed buffer is large enough to accommodate
the outgoing APTPL metadata.

Reported-by: Martin Svec <martin.svec@zoner.cz>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-02-11 18:34:40 -08:00
parent 3fd7b60f2c
commit f161d4b44d
2 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/target/target_core_pr.c
View File

@ -1862,8 +1862,8 @@ static int core_scsi3_update_aptpl_buf(
}
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
pr_err("Unable to update renaming"
" APTPL metadata\n");
pr_err("Unable to update renaming APTPL metadata,"
" reallocating larger buffer\n");
ret = -EMSGSIZE;
goto out;
}
@ -1880,8 +1880,8 @@ static int core_scsi3_update_aptpl_buf(
lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
pr_err("Unable to update renaming"
" APTPL metadata\n");
pr_err("Unable to update renaming APTPL metadata,"
" reallocating larger buffer\n");
ret = -EMSGSIZE;
goto out;
}
@ -1944,7 +1944,7 @@ static int __core_scsi3_write_aptpl_to_file(
static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
{
unsigned char *buf;
int rc;
int rc, len = PR_APTPL_BUF_LEN;
if (!aptpl) {
char *null_buf = "No Registrations or Reservations\n";
@ -1958,25 +1958,26 @@ static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, b
return 0;
}
buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
retry:
buf = vzalloc(len);
if (!buf)
return TCM_OUT_OF_RESOURCES;
rc = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN);
rc = core_scsi3_update_aptpl_buf(dev, buf, len);
if (rc < 0) {
kfree(buf);
return TCM_OUT_OF_RESOURCES;
vfree(buf);
len *= 2;
goto retry;
}
rc = __core_scsi3_write_aptpl_to_file(dev, buf);
if (rc != 0) {
pr_err("SPC-3 PR: Could not update APTPL\n");
kfree(buf);
vfree(buf);
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
dev->t10_pr.pr_aptpl_active = 1;
kfree(buf);
vfree(buf);
pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
return 0;
}

2
include/target/target_core_base.h
View File

@ -409,7 +409,7 @@ struct t10_reservation {
/* Activate Persistence across Target Power Loss enabled
* for SCSI device */
int pr_aptpl_active;
#define PR_APTPL_BUF_LEN 8192
#define PR_APTPL_BUF_LEN 262144
u32 pr_generation;
spinlock_t registration_lock;
spinlock_t aptpl_reg_lock;