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lustre: Correct KUC code max changelog msg size

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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.

Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/7406
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3587
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: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Drokin 2014-01-23 23:45:07 -05:00 committed by Greg Kroah-Hartman
parent 910827f174
commit 18e042f0c9
2 changed files with 5 additions and 3 deletions
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2
drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h
View file

@ -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 */

6
drivers/staging/lustre/lustre/mdc/mdc_request.c
View file

@ -1430,7 +1430,7 @@ 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;
@ -1503,7 +1503,7 @@ 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);
@ -1540,7 +1540,7 @@ 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;
}