From: "John L. Hammond" <john.hammond@xxxxxxxxx> Pre 2.10.1 MDTs will crash when they receive a listxattr (MDS_GETXATTR with OBD_MD_FLXATTRLS) RPC for an orphan or dead object. So for clients connected to these older MDTs, try to avoid sending listxattr RPCs by making the bulk getxattr (MDS_GETXATTR with OBD_MD_FLXATTRALL) more likely to succeed and thereby reducing the chances of falling back to listxattr. Signed-off-by: John L. Hammond <john.hammond@xxxxxxxxx> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10912 Reviewed-on: https://review.whamcloud.com/31990 Reviewed-by: Andreas Dilger <andreas.dilger@xxxxxxxxx> Reviewed-by: Fan Yong <fan.yong@xxxxxxxxx> Reviewed-by: Oleg Drokin <oleg.drokin@xxxxxxxxx> Signed-off-by: James Simmons <jsimmons@xxxxxxxxxxxxx> --- drivers/staging/lustre/lustre/mdc/mdc_locks.c | 31 +++++++++++++++++++++------ 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/drivers/staging/lustre/lustre/mdc/mdc_locks.c b/drivers/staging/lustre/lustre/mdc/mdc_locks.c index a8aa0fa..b991c6f 100644 --- a/drivers/staging/lustre/lustre/mdc/mdc_locks.c +++ b/drivers/staging/lustre/lustre/mdc/mdc_locks.c @@ -326,8 +326,10 @@ static void mdc_realloc_openmsg(struct ptlrpc_request *req, { struct ptlrpc_request *req; struct ldlm_intent *lit; + u32 min_buf_size = 0; int rc, count = 0; LIST_HEAD(cancels); + u32 buf_size = 0; req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LDLM_INTENT_GETXATTR); @@ -344,18 +346,33 @@ static void mdc_realloc_openmsg(struct ptlrpc_request *req, lit = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT); lit->opc = IT_GETXATTR; +#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0) + /* If the supplied buffer is too small then the server will + * return -ERANGE and llite will fallback to using non cached + * xattr operations. On servers before 2.10.1 a (non-cached) + * listxattr RPC for an orphan or dead file causes an oops. So + * let's try to avoid sending too small a buffer to too old a + * server. This is effectively undoing the memory conservation + * of LU-9417 when it would be *more* likely to crash the + * server. See LU-9856. + */ + if (exp->exp_connect_data.ocd_version < OBD_OCD_VERSION(2, 10, 1, 0)) + min_buf_size = exp->exp_connect_data.ocd_max_easize; +#endif + buf_size = max_t(u32, min_buf_size, + GA_DEFAULT_EA_NAME_LEN * GA_DEFAULT_EA_NUM); + /* pack the intended request */ - mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid, - GA_DEFAULT_EA_NAME_LEN * GA_DEFAULT_EA_NUM, -1, 0); + mdc_pack_body(req, &op_data->op_fid1, op_data->op_valid, buf_size, + -1, 0); - req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, - GA_DEFAULT_EA_NAME_LEN * GA_DEFAULT_EA_NUM); + req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, buf_size); - req_capsule_set_size(&req->rq_pill, &RMF_EAVALS, RCL_SERVER, - GA_DEFAULT_EA_NAME_LEN * GA_DEFAULT_EA_NUM); + req_capsule_set_size(&req->rq_pill, &RMF_EAVALS, RCL_SERVER, buf_size); req_capsule_set_size(&req->rq_pill, &RMF_EAVALS_LENS, RCL_SERVER, - sizeof(u32) * GA_DEFAULT_EA_NUM); + max_t(u32, min_buf_size, + sizeof(u32) * GA_DEFAULT_EA_NUM)); req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, 0); -- 1.8.3.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
