@@ -1877,8 +1877,8 @@ 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;
}
@@ -1895,8 +1895,8 @@ 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;
}
@@ -1959,7 +1959,7 @@ 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";
@@ -1973,25 +1973,26 @@ 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;
}
@@ -407,7 +407,7 @@ 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;
This is a note to let you know that I have just added a patch titled target: Fix PR_APTPL_BUF_LEN buffer size limitation to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue This patch is scheduled to be released in version 3.16.7-ckt8. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.16.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 736bd6f25322d684e7b51103498f489a77c8dc64 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger <nab@linux-iscsi.org> Date: Wed, 11 Feb 2015 18:34:40 -0800 Subject: target: Fix PR_APTPL_BUF_LEN buffer size limitation commit f161d4b44d7cc1dc66b53365215227db356378b1 upstream. 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> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/target/target_core_pr.c | 25 +++++++++++++------------ include/target/target_core_base.h | 2 +- 2 files changed, 14 insertions(+), 13 deletions(-)