[PATCH 17/26] staging/lustre/changelogs: Correct KUC code max changelog msg size

Peng Tao
2013-11-14T16:45:03Z

From: "Christopher J. Morrone" <morrone2@llnl.gov>

The kernel to userspace communication routines (KUC) allocate
and limit the maximum cs_buf size to CR_MAXSIZE. However this
fails to account for the fact that the buffer is assumed to begin
with a struct kuc_hdr. To allocate and account for that space,
we introduce a new define, KUC_CHANGELOG_MSG_MAXSIZE.

Lustre-change: http://review.whamcloud.com/7406
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3587
Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: jacques-Charles Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
---
.../include/linux/libcfs/libcfs_kernelcomm.h | 2 ++
drivers/staging/lustre/lustre/mdc/mdc_request.c | 6 +++---
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h
index 4e12ffc..e7469ac 100644
--- a/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h
+++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h
@@ -61,6 +61,8 @@ struct kuc_hdr {
__u16 kuc_msglen; /* Including header */
} __attribute__((aligned(sizeof(__u64))));

+#define KUC_CHANGELOG_MSG_MAXSIZE (sizeof(struct kuc_hdr)+CR_MAXSIZE)
+
#define KUC_MAGIC 0x191C /*Lustre9etLinC */
#define KUC_FL_BLOCK 0x01 /* Wait for send */

diff --git a/drivers/staging/lustre/lustre/mdc/mdc_request.c b/drivers/staging/lustre/lustre/mdc/mdc_request.c
index 651fcb1..eeac9b4 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_request.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_request.c
@@ -1452,7 +1452,7 @@ static struct kuc_hdr *changelog_kuc_hdr(char *buf, int len, int flags)
{
struct kuc_hdr *lh = (struct kuc_hdr *)buf;

- LASSERT(len <= CR_MAXSIZE);
+ LASSERT(len <= KUC_CHANGELOG_MSG_MAXSIZE);

lh->kuc_magic = KUC_MAGIC;
lh->kuc_transport = KUC_TRANSPORT_CHANGELOG;
@@ -1525,7 +1525,7 @@ static int mdc_changelog_send_thread(void *csdata)
CDEBUG(D_CHANGELOG, "changelog to fp=%p start "LPU64"\n",
cs->cs_fp, cs->cs_startrec);

- OBD_ALLOC(cs->cs_buf, CR_MAXSIZE);
+ OBD_ALLOC(cs->cs_buf, KUC_CHANGELOG_MSG_MAXSIZE);
if (cs->cs_buf == NULL)
GOTO(out, rc = -ENOMEM);

@@ -1562,7 +1562,7 @@ out:
if (ctxt)
llog_ctxt_put(ctxt);
if (cs->cs_buf)
- OBD_FREE(cs->cs_buf, CR_MAXSIZE);
+ OBD_FREE(cs->cs_buf, KUC_CHANGELOG_MSG_MAXSIZE);
OBD_FREE_PTR(cs);
return rc;
}
--
1.7.9.5