From 96575a86f55568e5e0a4d8d13aad1cf8a4aeb2b7 Mon Sep 17 00:00:00 2001 From: Ravishankar N Date: Fri, 30 Dec 2016 14:57:17 +0530 Subject: [PATCH 269/270] afr: Avoid resetting event_gen when brick is always down Backport of : http://review.gluster.org/16309 Problem: __afr_set_in_flight_sb_status(), which resets event_gen to zero, is called if failed_subvols[i] is non-zero for any brick. But failed_subvols[i] is true even if the brick was down *before* the transaction started. Hence say if 1 brick is down in a replica-3, every writev that comes will trigger an inode refresh because of this resetting, as seen from the no. of FSTATs in the profile info in the BZ. Fix: Reset event gen only if the brick was previously a valid read child and the FOP failed on it the first time. Also `s/afr_inode_read_subvol_reset/afr_inode_event_gen_reset` because the function only resets event gen and not the data/metadata readable. Change-Id: I2f6ccb792ad04b3b0d5cca5d5cb1a1d60e92046d BUG: 1410025 Signed-off-by: Ravishankar N Reviewed-on: https://code.engineering.redhat.com/gerrit/94930 Reviewed-by: Atin Mukherjee --- xlators/cluster/afr/src/afr-common.c | 24 +++++++++++++----------- xlators/cluster/afr/src/afr-dir-write.c | 6 +++--- xlators/cluster/afr/src/afr.h | 6 +----- 3 files changed, 17 insertions(+), 19 deletions(-) diff --git a/xlators/cluster/afr/src/afr-common.c b/xlators/cluster/afr/src/afr-common.c index d16ddec..696e909 100644 --- a/xlators/cluster/afr/src/afr-common.c +++ b/xlators/cluster/afr/src/afr-common.c @@ -134,6 +134,7 @@ __afr_inode_ctx_get (xlator_t *this, inode_t *inode, afr_inode_ctx_t **ctx) out: return ret; } + /* * INODE CTX 64-bit VALUE FORMAT FOR SMALL (<= 16) SUBVOL COUNTS: * @@ -195,10 +196,7 @@ __afr_set_in_flight_sb_status (xlator_t *this, afr_local_t *local, metadatamap_old = metadatamap = (val & 0x000000000000ffff); datamap_old = datamap = (val & 0x00000000ffff0000) >> 16; - /* Hard-code event to 0 since there is a failure and the inode - * needs to be refreshed anyway. - */ - event = 0; + event = (val & 0xffffffff00000000) >> 32; if (txn_type == AFR_DATA_TRANSACTION) tmp_map = datamap; @@ -231,6 +229,8 @@ __afr_set_in_flight_sb_status (xlator_t *this, afr_local_t *local, local->transaction.in_flight_sb = _gf_true; metadatamap |= (1 << index); } + if (metadatamap_old != metadatamap) + event = 0; break; case AFR_DATA_TRANSACTION: @@ -240,10 +240,12 @@ __afr_set_in_flight_sb_status (xlator_t *this, afr_local_t *local, local->transaction.in_flight_sb = _gf_true; datamap |= (1 << index); } + if (datamap_old != datamap) + event = 0; break; default: - break; + break; } val = ((uint64_t) metadatamap) | @@ -354,7 +356,7 @@ out: } int -__afr_inode_read_subvol_reset_small (inode_t *inode, xlator_t *this) +__afr_inode_event_gen_reset_small (inode_t *inode, xlator_t *this) { int ret = -1; uint16_t datamap = 0; @@ -455,7 +457,7 @@ out: } int -__afr_inode_read_subvol_reset (inode_t *inode, xlator_t *this) +__afr_inode_event_gen_reset (inode_t *inode, xlator_t *this) { afr_private_t *priv = NULL; int ret = -1; @@ -463,7 +465,7 @@ __afr_inode_read_subvol_reset (inode_t *inode, xlator_t *this) priv = this->private; if (priv->child_count <= 16) - ret = __afr_inode_read_subvol_reset_small (inode, this); + ret = __afr_inode_event_gen_reset_small (inode, this); else ret = -1; @@ -652,7 +654,7 @@ out: } int -afr_inode_read_subvol_reset (inode_t *inode, xlator_t *this) +afr_inode_event_gen_reset (inode_t *inode, xlator_t *this) { int ret = -1; @@ -660,7 +662,7 @@ afr_inode_read_subvol_reset (inode_t *inode, xlator_t *this) LOCK(&inode->lock); { - ret = __afr_inode_read_subvol_reset (inode, this); + ret = __afr_inode_event_gen_reset (inode, this); } UNLOCK(&inode->lock); out: @@ -2124,7 +2126,7 @@ afr_lookup_done (call_frame_t *frame, xlator_t *this) if (afr_replies_interpret (frame, this, local->inode, NULL)) { read_subvol = afr_read_subvol_decide (local->inode, this, &args); - afr_inode_read_subvol_reset (local->inode, this); + afr_inode_event_gen_reset (local->inode, this); goto cant_interpret; } else { read_subvol = afr_data_subvol_get (local->inode, this, diff --git a/xlators/cluster/afr/src/afr-dir-write.c b/xlators/cluster/afr/src/afr-dir-write.c index 286a539..8e483c3 100644 --- a/xlators/cluster/afr/src/afr-dir-write.c +++ b/xlators/cluster/afr/src/afr-dir-write.c @@ -122,12 +122,12 @@ __afr_dir_write_finalize (call_frame_t *frame, xlator_t *this) continue; if (local->replies[i].op_ret < 0) { if (local->inode) - afr_inode_read_subvol_reset (local->inode, this); + afr_inode_event_gen_reset (local->inode, this); if (local->parent) - afr_inode_read_subvol_reset (local->parent, + afr_inode_event_gen_reset (local->parent, this); if (local->parent2) - afr_inode_read_subvol_reset (local->parent2, + afr_inode_event_gen_reset (local->parent2, this); continue; } diff --git a/xlators/cluster/afr/src/afr.h b/xlators/cluster/afr/src/afr.h index 69d0584..c48507b 100644 --- a/xlators/cluster/afr/src/afr.h +++ b/xlators/cluster/afr/src/afr.h @@ -883,7 +883,7 @@ afr_inode_read_subvol_set (inode_t *inode, xlator_t *this, int event_generation); int -afr_inode_read_subvol_reset (inode_t *inode, xlator_t *this); +afr_inode_event_gen_reset (inode_t *inode, xlator_t *this); int afr_read_subvol_select_by_policy (inode_t *inode, xlator_t *this, @@ -907,10 +907,6 @@ afr_read_subvol_get (inode_t *inode, xlator_t *this, int *subvol_p, afr_read_subvol_get(i, t, s, r, e, AFR_METADATA_TRANSACTION, a) int -afr_inode_ctx_reset_unreadable_subvol (inode_t *inode, xlator_t *this, - int subvol_idx, int txn_type); - -int afr_inode_refresh (call_frame_t *frame, xlator_t *this, inode_t *inode, uuid_t gfid, afr_inode_refresh_cbk_t cbk); -- 2.9.3