Messages in this thread Patch in this message | | | From | Peng Tao <> | Subject | [PATCH 17/26] staging/lustre/changelogs: Correct KUC code max changelog msg size | Date | Fri, 15 Nov 2013 00:43:04 +0800 |
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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
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