cluster/ec: Don't enqueue an entry if it is already healing

Problem:
1 - heal-wait-qlength is by default 128. If shd is disabled
and we need to heal files, client side heal is needed.
If we access these files that will trigger the heal.
However, it has been observed that a file will be enqueued
multiple times in the heal wait queue, which in turn causes
queue to be filled and prevent other files to be enqueued.

2 - While a file is going through healing and a write fop from
mount comes on that file, it sends write on all the bricks including
healing one. At the end it updates version and size on all the
bricks. However, it does not unset dirty flag on all the bricks,
even if this write fop was successful on all the bricks.
After healing completion this dirty flag remain set and never
gets cleaned up if SHD is disabled.

Solution:
1 - If an entry is already in queue or going through heal process,
don't enqueue next client side request to heal the same file.

2 - Unset dirty on all the bricks at the end if fop has succeeded on
all the bricks even if some of the bricks are going through heal.

Change-Id: Ia61ffe230c6502ce6cb934425d55e2f40dd1a727
updates: bz#1593224
Signed-off-by: Ashish Pandey <aspandey@redhat.com>

5 files changed, 127 insertions, 30 deletions

diff --git a/xlators/cluster/ec/src/ec-common.c b/xlators/cluster/ec/src/ec-common.c
index 8d656702e12..518368073e8 100644
--- a/xlators/cluster/ec/src/ec-common.c
+++ b/xlators/cluster/ec/src/ec-common.c
@@ -313,14 +313,15 @@ ec_check_status(ec_fop_data_t *fop)
 
     gf_msg(fop->xl->name, GF_LOG_WARNING, 0, EC_MSG_OP_FAIL_ON_SUBVOLS,
            "Operation failed on %d of %d subvolumes.(up=%s, mask=%s, "
-           "remaining=%s, good=%s, bad=%s)",
+           "remaining=%s, good=%s, bad=%s, %s)",
            gf_bits_count(ec->xl_up & ~(fop->remaining | fop->good)), ec->nodes,
            ec_bin(str1, sizeof(str1), ec->xl_up, ec->nodes),
            ec_bin(str2, sizeof(str2), fop->mask, ec->nodes),
            ec_bin(str3, sizeof(str3), fop->remaining, ec->nodes),
            ec_bin(str4, sizeof(str4), fop->good, ec->nodes),
            ec_bin(str5, sizeof(str5), ec->xl_up & ~(fop->remaining | fop->good),
-                  ec->nodes));
+                  ec->nodes),
+           ec_msg_str(fop));
     if (fop->use_fd) {
         if (fop->fd != NULL) {
             ec_fheal(NULL, fop->xl, -1, EC_MINIMUM_ONE, ec_heal_report, NULL,
@@ -2371,37 +2372,47 @@ ec_update_info(ec_lock_link_t *link)
     uint64_t dirty[2] = {0, 0};
     uint64_t size;
     ec_t *ec = NULL;
+    uintptr_t mask;
 
     lock = link->lock;
     ctx = lock->ctx;
     ec = link->fop->xl->private;
 
     /* pre_version[*] will be 0 if have_version is false */
-    version[0] = ctx->post_version[0] - ctx->pre_version[0];
-    version[1] = ctx->post_version[1] - ctx->pre_version[1];
+    version[EC_DATA_TXN] = ctx->post_version[EC_DATA_TXN] -
+                           ctx->pre_version[EC_DATA_TXN];
+    version[EC_METADATA_TXN] = ctx->post_version[EC_METADATA_TXN] -
+                               ctx->pre_version[EC_METADATA_TXN];
 
     size = ctx->post_size - ctx->pre_size;
     /* If we set the dirty flag for update fop, we have to unset it.
      * If fop has failed on some bricks, leave the dirty as marked. */
+
     if (lock->unlock_now) {
+        if (version[EC_DATA_TXN]) {
+            /*A data fop will have difference in post and pre version
+             *and for data fop we send writes on healing bricks also */
+            mask = lock->good_mask | lock->healing;
+        } else {
+            mask = lock->good_mask;
+        }
         /* Ensure that nodes are up while doing final
          * metadata update.*/
-        if (!(ec->node_mask & ~lock->good_mask) &&
-            !(ec->node_mask & ~ec->xl_up)) {
-            if (ctx->dirty[0] != 0) {
-                dirty[0] = -1;
+        if (!(ec->node_mask & ~(mask)) && !(ec->node_mask & ~ec->xl_up)) {
+            if (ctx->dirty[EC_DATA_TXN] != 0) {
+                dirty[EC_DATA_TXN] = -1;
             }
-            if (ctx->dirty[1] != 0) {
-                dirty[1] = -1;
+            if (ctx->dirty[EC_METADATA_TXN] != 0) {
+                dirty[EC_METADATA_TXN] = -1;
             }
             /*If everything is fine and we already
              *have version xattr set on entry, there
              *is no need to update version again*/
-            if (ctx->pre_version[0]) {
-                version[0] = 0;
+            if (ctx->pre_version[EC_DATA_TXN]) {
+                version[EC_DATA_TXN] = 0;
             }
-            if (ctx->pre_version[1]) {
-                version[1] = 0;
+            if (ctx->pre_version[EC_METADATA_TXN]) {
+                version[EC_METADATA_TXN] = 0;
             }
         } else {
             link->optimistic_changelog = _gf_false;
@@ -2410,8 +2421,8 @@ ec_update_info(ec_lock_link_t *link)
         memset(ctx->dirty, 0, sizeof(ctx->dirty));
     }
 
-    if ((version[0] != 0) || (version[1] != 0) || (dirty[0] != 0) ||
-        (dirty[1] != 0)) {
+    if ((version[EC_DATA_TXN] != 0) || (version[EC_METADATA_TXN] != 0) ||
+        (dirty[EC_DATA_TXN] != 0) || (dirty[EC_METADATA_TXN] != 0)) {
         ec_update_size_version(link, version, size, dirty);
         return _gf_true;
     }
diff --git a/xlators/cluster/ec/src/ec-common.h b/xlators/cluster/ec/src/ec-common.h
index 115e1475b50..54aaa779443 100644
--- a/xlators/cluster/ec/src/ec-common.h
+++ b/xlators/cluster/ec/src/ec-common.h
@@ -190,4 +190,12 @@ ec_lock_unlocked(call_frame_t *frame, void *cookie, xlator_t *this,
 void
 ec_update_fd_status(fd_t *fd, xlator_t *xl, int child_index,
                     int32_t ret_status);
+gf_boolean_t
+ec_is_entry_healing(ec_fop_data_t *fop);
+void
+ec_set_entry_healing(ec_fop_data_t *fop);
+void
+ec_reset_entry_healing(ec_fop_data_t *fop);
+char *
+ec_msg_str(ec_fop_data_t *fop);
 #endif /* __EC_COMMON_H__ */
diff --git a/xlators/cluster/ec/src/ec-heal.c b/xlators/cluster/ec/src/ec-heal.c
index eaf80e023e3..1ca12c1674f 100644
--- a/xlators/cluster/ec/src/ec-heal.c
+++ b/xlators/cluster/ec/src/ec-heal.c
@@ -103,6 +103,48 @@ ec_sh_key_match(dict_t *dict, char *key, data_t *val, void *mdata)
 }
 /* FOP: heal */
 
+void
+ec_set_entry_healing(ec_fop_data_t *fop)
+{
+    ec_inode_t *ctx = NULL;
+    loc_t *loc = NULL;
+
+    if (!fop)
+        return;
+
+    loc = &fop->loc[0];
+    LOCK(&loc->inode->lock);
+    {
+        ctx = __ec_inode_get(loc->inode, fop->xl);
+        if (ctx) {
+            ctx->heal_count += 1;
+        }
+    }
+    UNLOCK(&loc->inode->lock);
+}
+
+void
+ec_reset_entry_healing(ec_fop_data_t *fop)
+{
+    ec_inode_t *ctx = NULL;
+    loc_t *loc = NULL;
+    int32_t heal_count = 0;
+    if (!fop)
+        return;
+
+    loc = &fop->loc[0];
+    LOCK(&loc->inode->lock);
+    {
+        ctx = __ec_inode_get(loc->inode, fop->xl);
+        if (ctx) {
+            ctx->heal_count += -1;
+            heal_count = ctx->heal_count;
+        }
+    }
+    UNLOCK(&loc->inode->lock);
+    GF_ASSERT(heal_count >= 0);
+}
+
 uintptr_t
 ec_heal_check(ec_fop_data_t *fop, uintptr_t *pgood)
 {
@@ -2507,17 +2549,6 @@ ec_heal_do(xlator_t *this, void *data, loc_t *loc, int32_t partial)
                "Heal is not required for : %s ", uuid_utoa(loc->gfid));
         goto out;
     }
-
-    msources = alloca0(ec->nodes);
-    mhealed_sinks = alloca0(ec->nodes);
-    ret = ec_heal_metadata(frame, ec, loc->inode, msources, mhealed_sinks);
-    if (ret == 0) {
-        mgood = ec_char_array_to_mask(msources, ec->nodes);
-        mbad = ec_char_array_to_mask(mhealed_sinks, ec->nodes);
-    } else {
-        op_ret = -1;
-        op_errno = -ret;
-    }
     sources = alloca0(ec->nodes);
     healed_sinks = alloca0(ec->nodes);
     if (IA_ISREG(loc->inode->ia_type)) {
@@ -2538,8 +2569,19 @@ ec_heal_do(xlator_t *this, void *data, loc_t *loc, int32_t partial)
         op_ret = -1;
         op_errno = -ret;
     }
+    msources = alloca0(ec->nodes);
+    mhealed_sinks = alloca0(ec->nodes);
+    ret = ec_heal_metadata(frame, ec, loc->inode, msources, mhealed_sinks);
+    if (ret == 0) {
+        mgood = ec_char_array_to_mask(msources, ec->nodes);
+        mbad = ec_char_array_to_mask(mhealed_sinks, ec->nodes);
+    } else {
+        op_ret = -1;
+        op_errno = -ret;
+    }
 
 out:
+    ec_reset_entry_healing(fop);
     if (fop->cbks.heal) {
         fop->cbks.heal(fop->req_frame, fop, fop->xl, op_ret, op_errno,
                        ec_char_array_to_mask(participants, ec->nodes),
@@ -2650,11 +2692,33 @@ ec_handle_healers_done(ec_fop_data_t *fop)
         ec_launch_heal(ec, heal_fop);
 }
 
+gf_boolean_t
+ec_is_entry_healing(ec_fop_data_t *fop)
+{
+    ec_inode_t *ctx = NULL;
+    int32_t heal_count = 0;
+    loc_t *loc = NULL;
+
+    loc = &fop->loc[0];
+
+    LOCK(&loc->inode->lock);
+    {
+        ctx = __ec_inode_get(loc->inode, fop->xl);
+        if (ctx) {
+            heal_count = ctx->heal_count;
+        }
+    }
+    UNLOCK(&loc->inode->lock);
+    GF_ASSERT(heal_count >= 0);
+    return heal_count;
+}
+
 void
 ec_heal_throttle(xlator_t *this, ec_fop_data_t *fop)
 {
     gf_boolean_t can_heal = _gf_true;
     ec_t *ec = this->private;
+    ec_fop_data_t *fop_rel = NULL;
 
     if (fop->req_frame == NULL) {
         LOCK(&ec->lock);
@@ -2662,8 +2726,13 @@ ec_heal_throttle(xlator_t *this, ec_fop_data_t *fop)
             if ((ec->background_heals > 0) &&
                 (ec->heal_wait_qlen + ec->background_heals) >
                     (ec->heal_waiters + ec->healers)) {
-                list_add_tail(&fop->healer, &ec->heal_waiting);
-                ec->heal_waiters++;
+                if (!ec_is_entry_healing(fop)) {
+                    list_add_tail(&fop->healer, &ec->heal_waiting);
+                    ec->heal_waiters++;
+                    ec_set_entry_healing(fop);
+                } else {
+                    fop_rel = fop;
+                }
                 fop = __ec_dequeue_heals(ec);
             } else {
                 can_heal = _gf_false;
@@ -2673,8 +2742,12 @@ ec_heal_throttle(xlator_t *this, ec_fop_data_t *fop)
     }
 
     if (can_heal) {
-        if (fop)
+        if (fop) {
+            if (fop->req_frame != NULL) {
+                ec_set_entry_healing(fop);
+            }
             ec_launch_heal(ec, fop);
+        }
     } else {
         gf_msg_debug(this->name, 0,
                      "Max number of heals are "
@@ -2682,6 +2755,9 @@ ec_heal_throttle(xlator_t *this, ec_fop_data_t *fop)
         ec_fop_set_error(fop, EBUSY);
         ec_heal_fail(ec, fop);
     }
+    if (fop_rel) {
+        ec_heal_done(0, NULL, fop_rel);
+    }
 }
 
 void
diff --git a/xlators/cluster/ec/src/ec-helpers.c b/xlators/cluster/ec/src/ec-helpers.c
index e6b0359bd6f..43f6e3b69d2 100644
--- a/xlators/cluster/ec/src/ec-helpers.c
+++ b/xlators/cluster/ec/src/ec-helpers.c
@@ -717,6 +717,7 @@ __ec_inode_get(inode_t *inode, xlator_t *xl)
             memset(ctx, 0, sizeof(*ctx));
             INIT_LIST_HEAD(&ctx->heal);
             INIT_LIST_HEAD(&ctx->stripe_cache.lru);
+            ctx->heal_count = 0;
             value = (uint64_t)(uintptr_t)ctx;
             if (__inode_ctx_set(inode, xl, &value) != 0) {
                 GF_FREE(ctx);
diff --git a/xlators/cluster/ec/src/ec-types.h b/xlators/cluster/ec/src/ec-types.h
index f3d63ca09ce..6ae4a2b970e 100644
--- a/xlators/cluster/ec/src/ec-types.h
+++ b/xlators/cluster/ec/src/ec-types.h
@@ -171,6 +171,7 @@ struct _ec_inode {
     gf_boolean_t have_config;
     gf_boolean_t have_version;
     gf_boolean_t have_size;
+    int32_t heal_count;
     ec_config_t config;
     uint64_t pre_version[2];
     uint64_t post_version[2];