/* Copyright (c) 2008-2012 Red Hat, Inc. This file is part of GlusterFS. This file is licensed to you under your choice of the GNU Lesser General Public License, version 3 or any later version (LGPLv3 or later), or the GNU General Public License, version 2 (GPLv2), in all cases as published by the Free Software Foundation. */ #include #include #include #include #include #include #include "glusterfs.h" #include "afr.h" #include "dict.h" #include "xlator.h" #include "hashfn.h" #include "logging.h" #include "stack.h" #include "list.h" #include "call-stub.h" #include "defaults.h" #include "common-utils.h" #include "compat-errno.h" #include "compat.h" #include "byte-order.h" #include "statedump.h" #include "inode.h" #include "fd.h" #include "afr-inode-read.h" #include "afr-inode-write.h" #include "afr-dir-read.h" #include "afr-dir-write.h" #include "afr-transaction.h" #include "afr-self-heal.h" #include "afr-self-heald.h" #include "afr-messages.h" call_frame_t * afr_copy_frame (call_frame_t *base) { afr_local_t *local = NULL; call_frame_t *frame = NULL; int op_errno = 0; frame = copy_frame (base); if (!frame) return NULL; local = AFR_FRAME_INIT (frame, op_errno); if (!local) { AFR_STACK_DESTROY (frame); return NULL; } return frame; } int __afr_inode_ctx_get (xlator_t *this, inode_t *inode, afr_inode_ctx_t **ctx) { uint64_t ctx_int = 0; int ret = -1; afr_inode_ctx_t *tmp_ctx = NULL; ret = __inode_ctx_get (inode, this, &ctx_int); if (ret) { tmp_ctx = GF_CALLOC (1, sizeof (afr_inode_ctx_t), gf_afr_mt_inode_ctx_t); if (!tmp_ctx) goto out; ctx_int = (long) tmp_ctx; ret = __inode_ctx_set (inode, this, &ctx_int); if (ret) { GF_FREE (tmp_ctx); goto out; } tmp_ctx->spb_choice = -1; tmp_ctx->read_subvol = 0; } else { tmp_ctx = (afr_inode_ctx_t *) ctx_int; } *ctx = tmp_ctx; ret = 0; out: return ret; } /* * INODE CTX 64-bit VALUE FORMAT FOR SMALL (<= 16) SUBVOL COUNTS: * * |<---------- 64bit ------------>| * 63 32 31 16 15 0 * | EVENT_GEN | DATA | METADATA | * * * METADATA (bit-0 .. bit-15): bitmap representing subvolumes from which * metadata can be attempted to be read. * * bit-0 => priv->subvolumes[0] * bit-1 => priv->subvolumes[1] * ... etc. till bit-15 * * DATA (bit-16 .. bit-31): bitmap representing subvolumes from which data * can be attempted to be read. * * bit-16 => priv->subvolumes[0] * bit-17 => priv->subvolumes[1] * ... etc. till bit-31 * * EVENT_GEN (bit-32 .. bit-63): event generation (i.e priv->event_generation) * when DATA and METADATA was last updated. * * If EVENT_GEN is < priv->event_generation, * or is 0, it means afr_inode_refresh() needs * to be called to recalculate the bitmaps. */ int __afr_inode_read_subvol_get_small (inode_t *inode, xlator_t *this, unsigned char *data, unsigned char *metadata, int *event_p) { afr_private_t *priv = NULL; int ret = -1; uint16_t datamap = 0; uint16_t metadatamap = 0; uint32_t event = 0; uint64_t val = 0; int i = 0; afr_inode_ctx_t *ctx = NULL; priv = this->private; ret = __afr_inode_ctx_get (this, inode, &ctx); if (ret < 0) return ret; val = ctx->read_subvol; metadatamap = (val & 0x000000000000ffff); datamap = (val & 0x00000000ffff0000) >> 16; event = (val & 0xffffffff00000000) >> 32; for (i = 0; i < priv->child_count; i++) { if (metadata) metadata[i] = (metadatamap >> i) & 1; if (data) data[i] = (datamap >> i) & 1; } if (event_p) *event_p = event; return ret; } int __afr_inode_read_subvol_set_small (inode_t *inode, xlator_t *this, unsigned char *data, unsigned char *metadata, int event) { afr_private_t *priv = NULL; uint16_t datamap = 0; uint16_t metadatamap = 0; uint64_t val = 0; int i = 0; int ret = -1; afr_inode_ctx_t *ctx = NULL; priv = this->private; ret = __afr_inode_ctx_get (this, inode, &ctx); if (ret) goto out; for (i = 0; i < priv->child_count; i++) { if (data[i]) datamap |= (1 << i); if (metadata[i]) metadatamap |= (1 << i); } val = ((uint64_t) metadatamap) | (((uint64_t) datamap) << 16) | (((uint64_t) event) << 32); ctx->read_subvol = val; ret = 0; out: return ret; } int __afr_inode_read_subvol_reset_small (inode_t *inode, xlator_t *this) { int ret = -1; uint16_t datamap = 0; uint16_t metadatamap = 0; uint32_t event = 0; uint64_t val = 0; afr_inode_ctx_t *ctx = NULL; ret = __afr_inode_ctx_get (this, inode, &ctx); if (ret) return ret; val = ctx->read_subvol; metadatamap = (val & 0x000000000000ffff) >> 0; datamap = (val & 0x00000000ffff0000) >> 16; event = 0; val = ((uint64_t) metadatamap) | (((uint64_t) datamap) << 16) | (((uint64_t) event) << 32); ctx->read_subvol = val; return ret; } int __afr_inode_read_subvol_get (inode_t *inode, xlator_t *this, unsigned char *data, unsigned char *metadata, int *event_p) { afr_private_t *priv = NULL; int ret = -1; priv = this->private; if (priv->child_count <= 16) ret = __afr_inode_read_subvol_get_small (inode, this, data, metadata, event_p); else /* TBD: allocate structure with array and read from it */ ret = -1; return ret; } int __afr_inode_split_brain_choice_get (inode_t *inode, xlator_t *this, int *spb_choice) { afr_inode_ctx_t *ctx = NULL; int ret = -1; ret = __afr_inode_ctx_get (this, inode, &ctx); if (ret < 0) return ret; *spb_choice = ctx->spb_choice; return 0; } int __afr_inode_read_subvol_set (inode_t *inode, xlator_t *this, unsigned char *data, unsigned char *metadata, int event) { afr_private_t *priv = NULL; int ret = -1; priv = this->private; if (priv->child_count <= 16) ret = __afr_inode_read_subvol_set_small (inode, this, data, metadata, event); else ret = -1; return ret; } int __afr_inode_split_brain_choice_set (inode_t *inode, xlator_t *this, int spb_choice) { afr_inode_ctx_t *ctx = NULL; int ret = -1; ret = __afr_inode_ctx_get (this, inode, &ctx); if (ret) goto out; ctx->spb_choice = spb_choice; ret = 0; out: return ret; } int __afr_inode_read_subvol_reset (inode_t *inode, xlator_t *this) { afr_private_t *priv = NULL; int ret = -1; priv = this->private; if (priv->child_count <= 16) ret = __afr_inode_read_subvol_reset_small (inode, this); else ret = -1; return ret; } int afr_inode_read_subvol_get (inode_t *inode, xlator_t *this, unsigned char *data, unsigned char *metadata, int *event_p) { int ret = -1; GF_VALIDATE_OR_GOTO (this->name, inode, out); LOCK(&inode->lock); { ret = __afr_inode_read_subvol_get (inode, this, data, metadata, event_p); } UNLOCK(&inode->lock); out: return ret; } int afr_inode_get_readable (call_frame_t *frame, inode_t *inode, xlator_t *this, unsigned char *readable, int *event_p, int type) { afr_private_t *priv = this->private; afr_local_t *local = frame->local; unsigned char *data = alloca0 (priv->child_count); unsigned char *metadata = alloca0 (priv->child_count); int data_count = 0; int metadata_count = 0; int event_generation = 0; int ret = 0; /* We don't care about split-brains for entry transactions. */ if (type == AFR_ENTRY_TRANSACTION || type == AFR_ENTRY_RENAME_TRANSACTION) return 0; ret = afr_inode_read_subvol_get (inode, this, data, metadata, &event_generation); if (ret == -1) return -EIO; data_count = AFR_COUNT (data, priv->child_count); metadata_count = AFR_COUNT (metadata, priv->child_count); if (inode->ia_type == IA_IFDIR) { /* For directories, allow even if it is in data split-brain. */ if (type == AFR_METADATA_TRANSACTION) { if (!metadata_count) return -EIO; } } else { /* For files, abort in case of data/metadata split-brain. */ if (!data_count || !metadata_count) return -EIO; } if (type == AFR_METADATA_TRANSACTION && readable) memcpy (readable, metadata, priv->child_count * sizeof *metadata); if (type == AFR_DATA_TRANSACTION && readable) { if (!data_count) memcpy (readable, local->child_up, priv->child_count * sizeof *readable); else memcpy (readable, data, priv->child_count * sizeof *data); } if (event_p) *event_p = event_generation; return 0; } int afr_inode_split_brain_choice_get (inode_t *inode, xlator_t *this, int *spb_choice) { int ret = -1; GF_VALIDATE_OR_GOTO (this->name, inode, out); LOCK(&inode->lock); { ret = __afr_inode_split_brain_choice_get (inode, this, spb_choice); } UNLOCK(&inode->lock); out: return ret; } int afr_inode_read_subvol_set (inode_t *inode, xlator_t *this, unsigned char *data, unsigned char *metadata, int event) { int ret = -1; GF_VALIDATE_OR_GOTO (this->name, inode, out); LOCK(&inode->lock); { ret = __afr_inode_read_subvol_set (inode, this, data, metadata, event); } UNLOCK(&inode->lock); out: return ret; } int afr_inode_split_brain_choice_set (inode_t *inode, xlator_t *this, int spb_choice) { int ret = -1; GF_VALIDATE_OR_GOTO (this->name, inode, out); LOCK(&inode->lock); { ret = __afr_inode_split_brain_choice_set (inode, this, spb_choice); } UNLOCK(&inode->lock); out: return ret; } int afr_inode_read_subvol_reset (inode_t *inode, xlator_t *this) { int ret = -1; GF_VALIDATE_OR_GOTO (this->name, inode, out); LOCK(&inode->lock); { ret = __afr_inode_read_subvol_reset (inode, this); } UNLOCK(&inode->lock); out: return ret; } int afr_spb_choice_timeout_cancel (xlator_t *this, inode_t *inode) { afr_inode_ctx_t *ctx = NULL; int ret = -1; if (!inode) return ret; LOCK(&inode->lock); { __afr_inode_ctx_get (this, inode, &ctx); if (!ctx) { gf_log (this->name, GF_LOG_WARNING, "Failed to cancel" " split-brain choice timer."); goto out; } ctx->spb_choice = -1; if (ctx->timer) { gf_timer_call_cancel (this->ctx, ctx->timer); ctx->timer = NULL; } ret = 0; } out: UNLOCK(&inode->lock); return ret; } void afr_set_split_brain_choice_cbk (void *data) { inode_t *inode = data; xlator_t *this = THIS; afr_spb_choice_timeout_cancel (this, inode); inode_unref (inode); return; } int afr_set_split_brain_choice (int ret, call_frame_t *frame, void *opaque) { int op_errno = ENOMEM; afr_private_t *priv = NULL; afr_inode_ctx_t *ctx = NULL; inode_t *inode = NULL; loc_t *loc = NULL; xlator_t *this = NULL; afr_spbc_timeout_t *data = opaque; struct timespec delta = {0, }; if (ret) goto out; frame = data->frame; loc = data->loc; this = frame->this; priv = this->private; delta.tv_sec = priv->spb_choice_timeout; delta.tv_nsec = 0; inode = loc->inode; if (!inode) goto out; if (!(data->d_spb || data->m_spb)) { gf_log (this->name, GF_LOG_WARNING, "Cannot set " "replica.split-brain-choice on %s. File is" " not in data/metadata split-brain.", uuid_utoa (loc->gfid)); ret = -1; op_errno = EINVAL; goto out; } LOCK(&inode->lock); { ret = __afr_inode_ctx_get (this, inode, &ctx); if (ret) { gf_log (this->name, GF_LOG_ERROR, "Failed to get" "inode_ctx for %s", loc->name); goto unlock; } ctx->spb_choice = data->spb_child_index; /* Possible changes in spb-choice : * -1 to valid : ref and inject timer * * valid to valid : cancel timer and inject new one * * valid to -1 : cancel timer and unref * * -1 to -1 : do not do anything */ /* ctx->timer is NULL iff previous value of * ctx->spb_choice is -1 */ if (ctx->timer) { if (ctx->spb_choice == -1) { gf_timer_call_cancel (this->ctx, ctx->timer); ctx->timer = NULL; inode_unref (inode); goto unlock; } goto reset_timer; } else { if (ctx->spb_choice == -1) goto unlock; } inode = inode_ref (loc->inode); goto set_timer; reset_timer: gf_timer_call_cancel (this->ctx, ctx->timer); ctx->timer = NULL; set_timer: ctx->timer = gf_timer_call_after (this->ctx, delta, afr_set_split_brain_choice_cbk, inode); } unlock: UNLOCK(&inode->lock); inode_invalidate (inode); out: if (data) GF_FREE (data); AFR_STACK_UNWIND (setxattr, frame, ret, op_errno, NULL); return 0; } int afr_accused_fill (xlator_t *this, dict_t *xdata, unsigned char *accused, afr_transaction_type type) { afr_private_t *priv = NULL; int i = 0; int idx = afr_index_for_transaction_type (type); void *pending_raw = NULL; int pending[3]; int ret = 0; priv = this->private; for (i = 0; i < priv->child_count; i++) { ret = dict_get_ptr (xdata, priv->pending_key[i], &pending_raw); if (ret) /* no pending flags */ continue; memcpy (pending, pending_raw, sizeof(pending)); if (ntoh32 (pending[idx])) accused[i] = 1; } return 0; } int afr_accuse_smallfiles (xlator_t *this, struct afr_reply *replies, unsigned char *data_accused) { int i = 0; afr_private_t *priv = NULL; uint64_t maxsize = 0; priv = this->private; for (i = 0; i < priv->child_count; i++) { if (data_accused[i]) continue; if (replies[i].poststat.ia_size > maxsize) maxsize = replies[i].poststat.ia_size; } for (i = 0; i < priv->child_count; i++) { if (data_accused[i]) continue; if ((priv->arbiter_count == 1) && (i == ARBITER_BRICK_INDEX)) continue; if (replies[i].poststat.ia_size < maxsize) data_accused[i] = 1; } return 0; } int afr_replies_interpret (call_frame_t *frame, xlator_t *this, inode_t *inode) { afr_local_t *local = NULL; afr_private_t *priv = NULL; struct afr_reply *replies = NULL; int event_generation = 0; int i = 0; unsigned char *data_accused = NULL; unsigned char *metadata_accused = NULL; unsigned char *data_readable = NULL; unsigned char *metadata_readable = NULL; int ret = 0; local = frame->local; priv = this->private; replies = local->replies; event_generation = local->event_generation; data_accused = alloca0 (priv->child_count); data_readable = alloca0 (priv->child_count); metadata_accused = alloca0 (priv->child_count); metadata_readable = alloca0 (priv->child_count); for (i = 0; i < priv->child_count; i++) { data_readable[i] = 1; metadata_readable[i] = 1; } for (i = 0; i < priv->child_count; i++) { if (!replies[i].valid) { data_readable[i] = 0; metadata_readable[i] = 0; continue; } if (replies[i].op_ret == -1) { data_readable[i] = 0; metadata_readable[i] = 0; continue; } afr_accused_fill (this, replies[i].xdata, data_accused, (replies[i].poststat.ia_type == IA_IFDIR) ? AFR_ENTRY_TRANSACTION : AFR_DATA_TRANSACTION); afr_accused_fill (this, replies[i].xdata, metadata_accused, AFR_METADATA_TRANSACTION); } if (inode->ia_type != IA_IFDIR) afr_accuse_smallfiles (this, replies, data_accused); for (i = 0; i < priv->child_count; i++) { if (data_accused[i]) { data_readable[i] = 0; ret = 1; } if (metadata_accused[i]) { metadata_readable[i] = 0; ret = 1; } } afr_inode_read_subvol_set (inode, this, data_readable, metadata_readable, event_generation); return ret; } int afr_refresh_selfheal_done (int ret, call_frame_t *heal, void *opaque) { if (heal) STACK_DESTROY (heal->root); return 0; } int afr_inode_refresh_err (call_frame_t *frame, xlator_t *this) { afr_local_t *local = NULL; afr_private_t *priv = NULL; int i = 0; int err = 0; local = frame->local; priv = this->private; for (i = 0; i < priv->child_count; i++) { if (local->replies[i].valid && !local->replies[i].op_ret) { err = 0; goto ret; } } err = afr_final_errno (local, priv); ret: return -err; } int afr_refresh_selfheal_wrap (void *opaque) { call_frame_t *frame = opaque; afr_local_t *local = NULL; xlator_t *this = NULL; int err = 0; local = frame->local; this = frame->this; afr_selfheal (frame->this, local->refreshinode->gfid); afr_selfheal_unlocked_discover (frame, local->refreshinode, local->refreshinode->gfid, local->replies); afr_replies_interpret (frame, this, local->refreshinode); err = afr_inode_refresh_err (frame, this); afr_local_replies_wipe (local, this->private); local->refreshfn (frame, this, err); return 0; } gf_boolean_t afr_selfheal_enabled (xlator_t *this) { afr_private_t *priv = NULL; gf_boolean_t data = _gf_false; int ret = 0; priv = this->private; ret = gf_string2boolean (priv->data_self_heal, &data); GF_ASSERT (!ret); return data || priv->metadata_self_heal || priv->entry_self_heal; } int afr_inode_refresh_done (call_frame_t *frame, xlator_t *this) { call_frame_t *heal = NULL; afr_local_t *local = NULL; int ret = 0; int err = 0; local = frame->local; ret = afr_replies_interpret (frame, this, local->refreshinode); err = afr_inode_refresh_err (frame, this); afr_local_replies_wipe (local, this->private); if (ret && afr_selfheal_enabled (this)) { heal = copy_frame (frame); if (heal) heal->root->pid = GF_CLIENT_PID_AFR_SELF_HEALD; ret = synctask_new (this->ctx->env, afr_refresh_selfheal_wrap, afr_refresh_selfheal_done, heal, frame); if (ret) goto refresh_done; } else { refresh_done: local->refreshfn (frame, this, err); } return 0; } int afr_inode_refresh_subvol_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret, int op_errno, inode_t *inode, struct iatt *buf, dict_t *xdata, struct iatt *par) { afr_local_t *local = NULL; int call_child = (long) cookie; int call_count = 0; local = frame->local; local->replies[call_child].valid = 1; local->replies[call_child].op_ret = op_ret; local->replies[call_child].op_errno = op_errno; if (op_ret != -1) { local->replies[call_child].poststat = *buf; local->replies[call_child].postparent = *par; local->replies[call_child].xdata = dict_ref (xdata); } call_count = afr_frame_return (frame); if (call_count == 0) afr_inode_refresh_done (frame, this); return 0; } int afr_inode_refresh_subvol (call_frame_t *frame, xlator_t *this, int i, inode_t *inode, dict_t *xdata) { loc_t loc = {0, }; afr_private_t *priv = NULL; priv = this->private; loc.inode = inode; gf_uuid_copy (loc.gfid, inode->gfid); STACK_WIND_COOKIE (frame, afr_inode_refresh_subvol_cbk, (void *) (long) i, priv->children[i], priv->children[i]->fops->lookup, &loc, xdata); return 0; } int afr_inode_refresh_do (call_frame_t *frame, xlator_t *this) { afr_local_t *local = NULL; afr_private_t *priv = NULL; int call_count = 0; int i = 0; dict_t *xdata = NULL; priv = this->private; local = frame->local; afr_local_replies_wipe (local, priv); xdata = dict_new (); if (!xdata) { afr_inode_refresh_done (frame, this); return 0; } if (afr_xattr_req_prepare (this, xdata) != 0) { dict_unref (xdata); afr_inode_refresh_done (frame, this); return 0; } local->call_count = AFR_COUNT (local->child_up, priv->child_count); call_count = local->call_count; for (i = 0; i < priv->child_count; i++) { if (!local->child_up[i]) continue; afr_inode_refresh_subvol (frame, this, i, local->refreshinode, xdata); if (!--call_count) break; } dict_unref (xdata); return 0; } int afr_inode_refresh (call_frame_t *frame, xlator_t *this, inode_t *inode, afr_inode_refresh_cbk_t refreshfn) { afr_local_t *local = NULL; local = frame->local; local->refreshfn = refreshfn; if (local->refreshinode) { inode_unref (local->refreshinode); local->refreshinode = NULL; } local->refreshinode = inode_ref (inode); afr_inode_refresh_do (frame, this); return 0; } int afr_xattr_req_prepare (xlator_t *this, dict_t *xattr_req) { int i = 0; afr_private_t *priv = NULL; int ret = 0; priv = this->private; for (i = 0; i < priv->child_count; i++) { ret = dict_set_uint64 (xattr_req, priv->pending_key[i], AFR_NUM_CHANGE_LOGS * sizeof(int)); if (ret < 0) gf_msg (this->name, GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "Unable to set dict value for %s", priv->pending_key[i]); /* 3 = data+metadata+entry */ } ret = dict_set_uint64 (xattr_req, AFR_DIRTY, AFR_NUM_CHANGE_LOGS * sizeof(int)); if (ret) { gf_msg_debug (this->name, -ret, "failed to set dirty " "query flag"); } ret = dict_set_int32 (xattr_req, "list-xattr", 1); if (ret) { gf_msg_debug (this->name, -ret, "Unable to set list-xattr in dict "); } return ret; } int afr_lookup_xattr_req_prepare (afr_local_t *local, xlator_t *this, dict_t *xattr_req, loc_t *loc) { int ret = -ENOMEM; if (!local->xattr_req) local->xattr_req = dict_new (); if (!local->xattr_req) goto out; if (xattr_req && (xattr_req != local->xattr_req)) dict_copy (xattr_req, local->xattr_req); ret = afr_xattr_req_prepare (this, local->xattr_req); ret = dict_set_uint64 (local->xattr_req, GLUSTERFS_INODELK_COUNT, 0); if (ret < 0) { gf_msg (this->name, GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "%s: Unable to set dict value for %s", loc->path, GLUSTERFS_INODELK_COUNT); } ret = dict_set_uint64 (local->xattr_req, GLUSTERFS_ENTRYLK_COUNT, 0); if (ret < 0) { gf_msg (this->name, GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "%s: Unable to set dict value for %s", loc->path, GLUSTERFS_ENTRYLK_COUNT); } ret = dict_set_uint32 (local->xattr_req, GLUSTERFS_PARENT_ENTRYLK, 0); if (ret < 0) { gf_msg (this->name, GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "%s: Unable to set dict value for %s", loc->path, GLUSTERFS_PARENT_ENTRYLK); } ret = 0; out: return ret; } int afr_hash_child (afr_read_subvol_args_t *args, int32_t child_count, int hashmode) { uuid_t gfid_copy = {0,}; pid_t pid; if (!hashmode) { return -1; } gf_uuid_copy (gfid_copy, args->gfid); if ((hashmode > 1) && (args->ia_type != IA_IFDIR)) { /* * Why getpid? Because it's one of the cheapest calls * available - faster than gethostname etc. - and returns a * constant-length value that's sure to be shorter than a UUID. * It's still very unlikely to be the same across clients, so * it still provides good mixing. We're not trying for * perfection here. All we need is a low probability that * multiple clients won't converge on the same subvolume. */ pid = getpid(); memcpy (gfid_copy, &pid, sizeof(pid)); } return SuperFastHash((char *)gfid_copy, sizeof(gfid_copy)) % child_count; } int afr_read_subvol_select_by_policy (inode_t *inode, xlator_t *this, unsigned char *readable, afr_read_subvol_args_t *args) { int i = 0; int read_subvol = -1; afr_private_t *priv = NULL; afr_read_subvol_args_t local_args = {0,}; priv = this->private; /* first preference - explicitly specified or local subvolume */ if (priv->read_child >= 0 && readable[priv->read_child]) return priv->read_child; if (inode_is_linked (inode)) { gf_uuid_copy (local_args.gfid, inode->gfid); local_args.ia_type = inode->ia_type; } else if (args) { local_args = *args; } /* second preference - use hashed mode */ read_subvol = afr_hash_child (&local_args, priv->child_count, priv->hash_mode); if (read_subvol >= 0 && readable[read_subvol]) return read_subvol; for (i = 0; i < priv->child_count; i++) { if (readable[i]) return i; } /* no readable subvolumes, either split brain or all subvols down */ return -1; } int afr_inode_read_subvol_type_get (inode_t *inode, xlator_t *this, unsigned char *readable, int *event_p, int type) { int ret = -1; if (type == AFR_METADATA_TRANSACTION) ret = afr_inode_read_subvol_get (inode, this, 0, readable, event_p); else ret = afr_inode_read_subvol_get (inode, this, readable, 0, event_p); return ret; } int afr_read_subvol_get (inode_t *inode, xlator_t *this, int *subvol_p, int *event_p, afr_transaction_type type, afr_read_subvol_args_t *args) { afr_private_t *priv = NULL; unsigned char *data_readable = NULL; unsigned char *metadata_readable = NULL; unsigned char *readable = NULL; unsigned char *intersection = NULL; int subvol = -1; int event = 0; priv = this->private; readable = alloca0 (priv->child_count); data_readable = alloca0 (priv->child_count); metadata_readable = alloca0 (priv->child_count); intersection = alloca0 (priv->child_count); afr_inode_read_subvol_type_get (inode, this, readable, &event, type); afr_inode_read_subvol_get (inode, this, data_readable, metadata_readable, &event); AFR_INTERSECT (intersection, data_readable, metadata_readable, priv->child_count); if (AFR_COUNT (intersection, priv->child_count) > 0) subvol = afr_read_subvol_select_by_policy (inode, this, intersection, args); else subvol = afr_read_subvol_select_by_policy (inode, this, readable, args); if (subvol_p) *subvol_p = subvol; if (event_p) *event_p = event; return subvol; } void afr_local_transaction_cleanup (afr_local_t *local, xlator_t *this) { afr_private_t *priv = NULL; int i = 0; priv = this->private; afr_matrix_cleanup (local->pending, priv->child_count); GF_FREE (local->internal_lock.locked_nodes); for (i = 0; local->internal_lock.inodelk[i].domain; i++) { GF_FREE (local->internal_lock.inodelk[i].locked_nodes); } GF_FREE (local->internal_lock.lower_locked_nodes); afr_entry_lockee_cleanup (&local->internal_lock); GF_FREE (local->transaction.pre_op); GF_FREE (local->transaction.pre_op_sources); if (local->transaction.pre_op_xdata) { for (i = 0; i < priv->child_count; i++) { if (!local->transaction.pre_op_xdata[i]) continue; dict_unref (local->transaction.pre_op_xdata[i]); } GF_FREE (local->transaction.pre_op_xdata); } GF_FREE (local->transaction.eager_lock); GF_FREE (local->transaction.fop_subvols); GF_FREE (local->transaction.failed_subvols); GF_FREE (local->transaction.basename); GF_FREE (local->transaction.new_basename); loc_wipe (&local->transaction.parent_loc); loc_wipe (&local->transaction.new_parent_loc); } void afr_replies_wipe (struct afr_reply *replies, int count) { int i = 0; for (i = 0; i < count; i++) { if (replies[i].xdata) { dict_unref (replies[i].xdata); replies[i].xdata = NULL; } } } void afr_local_replies_wipe (afr_local_t *local, afr_private_t *priv) { if (!local->replies) return; afr_replies_wipe (local->replies, priv->child_count); memset (local->replies, 0, sizeof(*local->replies) * priv->child_count); } void afr_remove_eager_lock_stub (afr_local_t *local) { LOCK (&local->fd->lock); { list_del_init (&local->transaction.eager_locked); } UNLOCK (&local->fd->lock); } void afr_local_cleanup (afr_local_t *local, xlator_t *this) { afr_private_t * priv = NULL; if (!local) return; syncbarrier_destroy (&local->barrier); if (local->transaction.eager_lock_on && !list_empty (&local->transaction.eager_locked)) afr_remove_eager_lock_stub (local); afr_local_transaction_cleanup (local, this); priv = this->private; loc_wipe (&local->loc); loc_wipe (&local->newloc); if (local->fd) fd_unref (local->fd); if (local->xattr_req) dict_unref (local->xattr_req); if (local->dict) dict_unref (local->dict); afr_local_replies_wipe (local, priv); GF_FREE(local->replies); GF_FREE (local->child_up); GF_FREE (local->read_attempted); GF_FREE (local->readable); if (local->inode) inode_unref (local->inode); if (local->parent) inode_unref (local->parent); if (local->parent2) inode_unref (local->parent2); if (local->refreshinode) inode_unref (local->refreshinode); { /* getxattr */ GF_FREE (local->cont.getxattr.name); } { /* lk */ GF_FREE (local->cont.lk.locked_nodes); } { /* create */ if (local->cont.create.fd) fd_unref (local->cont.create.fd); if (local->cont.create.params) dict_unref (local->cont.create.params); } { /* mknod */ if (local->cont.mknod.params) dict_unref (local->cont.mknod.params); } { /* mkdir */ if (local->cont.mkdir.params) dict_unref (local->cont.mkdir.params); } { /* symlink */ if (local->cont.symlink.params) dict_unref (local->cont.symlink.params); } { /* writev */ GF_FREE (local->cont.writev.vector); if (local->cont.writev.iobref) iobref_unref (local->cont.writev.iobref); } { /* setxattr */ if (local->cont.setxattr.dict) dict_unref (local->cont.setxattr.dict); } { /* fsetxattr */ if (local->cont.fsetxattr.dict) dict_unref (local->cont.fsetxattr.dict); } { /* removexattr */ GF_FREE (local->cont.removexattr.name); } { /* xattrop */ if (local->cont.xattrop.xattr) dict_unref (local->cont.xattrop.xattr); } { /* fxattrop */ if (local->cont.fxattrop.xattr) dict_unref (local->cont.fxattrop.xattr); } { /* symlink */ GF_FREE (local->cont.symlink.linkpath); } { /* opendir */ GF_FREE (local->cont.opendir.checksum); } { /* readdirp */ if (local->cont.readdir.dict) dict_unref (local->cont.readdir.dict); } { /* inodelk */ GF_FREE (local->cont.inodelk.volume); } if (local->xdata_req) dict_unref (local->xdata_req); if (local->xdata_rsp) dict_unref (local->xdata_rsp); } int afr_frame_return (call_frame_t *frame) { afr_local_t *local = NULL; int call_count = 0; local = frame->local; LOCK (&frame->lock); { call_count = --local->call_count; } UNLOCK (&frame->lock); return call_count; } gf_boolean_t afr_is_entry_possibly_under_txn (afr_local_t *local, xlator_t *this) { int i = 0; int tmp = 0; afr_private_t *priv = NULL; priv = this->private; for (i = 0; i < priv->child_count; i++) { if (!local->replies[i].xdata) continue; if (dict_get_int32 (local->replies[i].xdata, GLUSTERFS_PARENT_ENTRYLK, &tmp) == 0) if (tmp) return _gf_true; } return _gf_false; } static char *afr_ignore_xattrs[] = { GLUSTERFS_OPEN_FD_COUNT, GLUSTERFS_PARENT_ENTRYLK, GLUSTERFS_ENTRYLK_COUNT, GLUSTERFS_INODELK_COUNT, GF_SELINUX_XATTR_KEY, QUOTA_SIZE_KEY, NULL }; gf_boolean_t afr_is_xattr_ignorable (char *key) { int i = 0; if (!strncmp (key, AFR_XATTR_PREFIX, strlen(AFR_XATTR_PREFIX))) return _gf_true; for (i = 0; afr_ignore_xattrs[i]; i++) { if (!strcmp (key, afr_ignore_xattrs[i])) return _gf_true; } return _gf_false; } static gf_boolean_t afr_xattr_match (dict_t *this, char *key1, data_t *value1, void *data) { if (!afr_is_xattr_ignorable (key1)) return _gf_true; return _gf_false; } gf_boolean_t afr_xattrs_are_equal (dict_t *dict1, dict_t *dict2) { return are_dicts_equal (dict1, dict2, afr_xattr_match, NULL); } static int afr_get_parent_read_subvol (xlator_t *this, inode_t *parent, struct afr_reply *replies, unsigned char *readable) { int i = 0; int par_read_subvol = -1; int par_read_subvol_iter = -1; afr_private_t *priv = NULL; priv = this->private; if (parent) par_read_subvol = afr_data_subvol_get (parent, this, 0, 0, NULL); for (i = 0; i < priv->child_count; i++) { if (!replies[i].valid) continue; if (replies[i].op_ret < 0) continue; if (par_read_subvol_iter == -1) { par_read_subvol_iter = i; continue; } if ((par_read_subvol_iter != par_read_subvol) && readable[i]) par_read_subvol_iter = i; if (i == par_read_subvol) par_read_subvol_iter = i; } /* At the end of the for-loop, the only reason why @par_read_subvol_iter * could be -1 is when this LOOKUP has failed on all sub-volumes. * So it is okay to send an arbitrary subvolume (0 in this case) * as parent read subvol. */ if (par_read_subvol_iter == -1) par_read_subvol_iter = 0; return par_read_subvol_iter; } static void afr_lookup_done (call_frame_t *frame, xlator_t *this) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = -1; int op_errno = 0; int read_subvol = 0; int par_read_subvol = 0; unsigned char *readable = NULL; int event = 0; struct afr_reply *replies = NULL; uuid_t read_gfid = {0, }; gf_boolean_t locked_entry = _gf_false; gf_boolean_t can_interpret = _gf_true; inode_t *parent = NULL; int spb_choice = -1; ia_type_t ia_type = IA_INVAL; afr_read_subvol_args_t args = {0,}; priv = this->private; local = frame->local; replies = local->replies; parent = local->loc.parent; locked_entry = afr_is_entry_possibly_under_txn (local, this); readable = alloca0 (priv->child_count); afr_inode_read_subvol_get (parent, this, readable, NULL, &event); afr_inode_split_brain_choice_get (local->inode, this, &spb_choice); /* First, check if we have a gfid-change from somewhere, If so, propagate that so that a fresh lookup can be issued */ if (local->cont.lookup.needs_fresh_lookup) { local->op_ret = -1; local->op_errno = ESTALE; goto unwind; } op_errno = afr_final_errno (frame->local, this->private); local->op_errno = op_errno; read_subvol = -1; for (i = 0; i < priv->child_count; i++) { if (!replies[i].valid) continue; if (locked_entry && replies[i].op_ret == -1 && replies[i].op_errno == ENOENT) { /* Second, check entry is still "underway" in creation */ local->op_ret = -1; local->op_errno = ENOENT; goto unwind; } if (replies[i].op_ret == -1) continue; if (read_subvol == -1 || !readable[read_subvol]) { read_subvol = i; gf_uuid_copy (read_gfid, replies[i].poststat.ia_gfid); ia_type = replies[i].poststat.ia_type; local->op_ret = 0; } } if (read_subvol == -1) goto unwind; /* We now have a read_subvol, which is readable[] (if there were any). Next we look for GFID mismatches. We don't consider a GFID mismatch as an error if read_subvol is readable[] but the mismatching GFID subvol is not. */ for (i = 0; i < priv->child_count; i++) { if (!replies[i].valid || replies[i].op_ret == -1) { if (priv->child_up[i]) can_interpret = _gf_false; continue; } if (!gf_uuid_compare (replies[i].poststat.ia_gfid, read_gfid)) continue; can_interpret = _gf_false; if (locked_entry) continue; /* Now GFIDs mismatch. It's OK as long as this subvol is not readable[] but read_subvol is */ if (readable[read_subvol] && !readable[i]) continue; /* LOG ERROR */ local->op_ret = -1; local->op_errno = EIO; goto unwind; } /* Forth, for the finalized GFID, pick the best subvolume to return stats from. */ if (can_interpret) { /* It is safe to call afr_replies_interpret() because we have a response from all the UP subvolumes and all of them resolved to the same GFID */ gf_uuid_copy (args.gfid, read_gfid); args.ia_type = ia_type; if (afr_replies_interpret (frame, this, local->inode)) { read_subvol = afr_data_subvol_get (local->inode, this, 0, 0, &args); afr_inode_read_subvol_reset (local->inode, this); goto cant_interpret; } else { read_subvol = afr_data_subvol_get (local->inode, this, 0, 0, &args); } } else { cant_interpret: if (read_subvol == -1) { if (spb_choice >= 0) read_subvol = spb_choice; else read_subvol = 0; } dict_del (replies[read_subvol].xdata, GF_CONTENT_KEY); } afr_handle_quota_size (frame, this); unwind: if (read_subvol == -1) { if (spb_choice >= 0) read_subvol = spb_choice; else read_subvol = 0; } par_read_subvol = afr_get_parent_read_subvol (this, parent, replies, readable); AFR_STACK_UNWIND (lookup, frame, local->op_ret, local->op_errno, local->inode, &local->replies[read_subvol].poststat, local->replies[read_subvol].xdata, &local->replies[par_read_subvol].postparent); } /* * During a lookup, some errors are more "important" than * others in that they must be given higher priority while * returning to the user. * * The hierarchy is ENODATA > ENOENT > ESTALE > others */ int afr_higher_errno (int32_t old_errno, int32_t new_errno) { if (old_errno == ENODATA || new_errno == ENODATA) return ENODATA; if (old_errno == ENOENT || new_errno == ENOENT) return ENOENT; if (old_errno == ESTALE || new_errno == ESTALE) return ESTALE; return new_errno; } int afr_final_errno (afr_local_t *local, afr_private_t *priv) { int i = 0; int op_errno = 0; int tmp_errno = 0; for (i = 0; i < priv->child_count; i++) { if (!local->replies[i].valid) continue; if (local->replies[i].op_ret >= 0) continue; tmp_errno = local->replies[i].op_errno; op_errno = afr_higher_errno (op_errno, tmp_errno); } return op_errno; } static int32_t afr_local_discovery_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *dict, dict_t *xdata) { int ret = 0; char *pathinfo = NULL; gf_boolean_t is_local = _gf_false; afr_private_t *priv = NULL; int32_t child_index = -1; if (op_ret != 0) { goto out; } priv = this->private; child_index = (int32_t)(long)cookie; ret = dict_get_str (dict, GF_XATTR_PATHINFO_KEY, &pathinfo); if (ret != 0) { goto out; } ret = glusterfs_is_local_pathinfo (pathinfo, &is_local); if (ret) { goto out; } /* * Note that one local subvolume will override another here. The only * way to avoid that would be to retain extra information about whether * the previous read_child is local, and it's just not worth it. Even * the slowest local subvolume is far preferable to a remote one. */ if (is_local) { /* Don't set arbiter as read child. */ if ((priv->arbiter_count == 1) && (child_index == ARBITER_BRICK_INDEX)) goto out; gf_msg (this->name, GF_LOG_INFO, 0, AFR_MSG_LOCAL_CHILD, "selecting local read_child %s", priv->children[child_index]->name); priv->read_child = child_index; } out: STACK_DESTROY(frame->root); return 0; } static void afr_attempt_local_discovery (xlator_t *this, int32_t child_index) { call_frame_t *newframe = NULL; loc_t tmploc = {0,}; afr_private_t *priv = this->private; newframe = create_frame(this,this->ctx->pool); if (!newframe) { return; } tmploc.gfid[sizeof(tmploc.gfid)-1] = 1; STACK_WIND_COOKIE (newframe, afr_local_discovery_cbk, (void *)(long)child_index, priv->children[child_index], priv->children[child_index]->fops->getxattr, &tmploc, GF_XATTR_PATHINFO_KEY, NULL); } int afr_lookup_sh_metadata_wrap (void *opaque) { call_frame_t *frame = opaque; afr_local_t *local = NULL; xlator_t *this = NULL; inode_t *inode = NULL; afr_private_t *priv = NULL; struct afr_reply *replies = NULL; int i= 0, first = -1; local = frame->local; this = frame->this; priv = this->private; replies = local->replies; for (i =0; i < priv->child_count; i++) { if(!replies[i].valid || replies[i].op_ret == -1) continue; first = i; break; } if (first == -1) goto out; inode = afr_inode_link (local->inode,&replies[first].poststat); if(!inode) goto out; afr_selfheal_metadata (frame, this, inode); inode_forget (inode, 1); inode_unref (inode); afr_local_replies_wipe (local, this->private); inode = afr_selfheal_unlocked_lookup_on (frame, local->loc.parent, local->loc.name, local->replies, local->child_up, NULL); if (inode) inode_unref (inode); out: afr_lookup_done (frame, this); return 0; } static gf_boolean_t afr_can_start_metadata_self_heal(call_frame_t *frame, xlator_t *this) { afr_local_t *local = NULL; afr_private_t *priv = NULL; struct afr_reply *replies = NULL; int i = 0, first = -1; gf_boolean_t start = _gf_false; struct iatt stbuf = {0, }; local = frame->local; replies = local->replies; priv = this->private; if (!priv->metadata_self_heal) return _gf_false; for (i = 0; i < priv->child_count; i++) { if(!replies[i].valid || replies[i].op_ret == -1) continue; if (first == -1) { first = i; stbuf = replies[i].poststat; continue; } if (gf_uuid_compare (stbuf.ia_gfid, replies[i].poststat.ia_gfid)) { start = _gf_false; break; } if (!IA_EQUAL (stbuf, replies[i].poststat, type)) { start = _gf_false; break; } /*Check if iattrs need heal*/ if ((!IA_EQUAL (stbuf, replies[i].poststat, uid)) || (!IA_EQUAL (stbuf, replies[i].poststat, gid)) || (!IA_EQUAL (stbuf, replies[i].poststat, prot))) { start = _gf_true; continue; } /*Check if xattrs need heal*/ if (!afr_xattrs_are_equal (replies[first].xdata, replies[i].xdata)) start = _gf_true; } return start; } int afr_lookup_metadata_heal_check (call_frame_t *frame, xlator_t *this) { call_frame_t *heal = NULL; int ret = 0; if (!afr_can_start_metadata_self_heal (frame, this)) goto out; heal = copy_frame (frame); if (heal) heal->root->pid = GF_CLIENT_PID_AFR_SELF_HEALD; ret = synctask_new (this->ctx->env, afr_lookup_sh_metadata_wrap, afr_refresh_selfheal_done, heal, frame); if(ret) goto out; return ret; out: afr_lookup_done (frame, this); return ret; } int afr_lookup_selfheal_wrap (void *opaque) { int ret = 0; call_frame_t *frame = opaque; afr_local_t *local = NULL; xlator_t *this = NULL; inode_t *inode = NULL; local = frame->local; this = frame->this; ret = afr_selfheal_name (frame->this, local->loc.pargfid, local->loc.name, &local->cont.lookup.gfid_req); if (ret == -EIO) goto unwind; afr_local_replies_wipe (local, this->private); inode = afr_selfheal_unlocked_lookup_on (frame, local->loc.parent, local->loc.name, local->replies, local->child_up, NULL); if (inode) inode_unref (inode); afr_lookup_metadata_heal_check(frame, this); return 0; unwind: AFR_STACK_UNWIND (lookup, frame, -1, EIO, NULL, NULL, NULL, NULL); return 0; } int afr_lookup_entry_heal (call_frame_t *frame, xlator_t *this) { afr_local_t *local = NULL; afr_private_t *priv = NULL; call_frame_t *heal = NULL; int i = 0, first = -1; gf_boolean_t need_heal = _gf_false; struct afr_reply *replies = NULL; int ret = 0; local = frame->local; replies = local->replies; priv = this->private; for (i = 0; i < priv->child_count; i++) { if (!replies[i].valid) continue; if ((replies[i].op_ret == -1) && (replies[i].op_errno == ENODATA)) need_heal = _gf_true; if (first == -1) { first = i; continue; } if (replies[i].op_ret != replies[first].op_ret) { need_heal = _gf_true; break; } if (gf_uuid_compare (replies[i].poststat.ia_gfid, replies[first].poststat.ia_gfid)) { need_heal = _gf_true; break; } } if (need_heal) { heal = copy_frame (frame); if (heal) heal->root->pid = GF_CLIENT_PID_AFR_SELF_HEALD; ret = synctask_new (this->ctx->env, afr_lookup_selfheal_wrap, afr_refresh_selfheal_done, heal, frame); if (ret) goto metadata_heal; return ret; } metadata_heal: ret = afr_lookup_metadata_heal_check (frame, this); return ret; } int afr_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret, int op_errno, inode_t *inode, struct iatt *buf, dict_t *xdata, struct iatt *postparent) { afr_local_t * local = NULL; int call_count = -1; int child_index = -1; child_index = (long) cookie; local = frame->local; local->replies[child_index].valid = 1; local->replies[child_index].op_ret = op_ret; local->replies[child_index].op_errno = op_errno; /* * On revalidate lookup if the gfid-changed, afr should unwind the fop * with ESTALE so that a fresh lookup will be sent by the top xlator. * So remember it. */ if (xdata && dict_get (xdata, "gfid-changed")) local->cont.lookup.needs_fresh_lookup = _gf_true; if (op_ret != -1) { local->replies[child_index].poststat = *buf; local->replies[child_index].postparent = *postparent; if (xdata) local->replies[child_index].xdata = dict_ref (xdata); } call_count = afr_frame_return (frame); if (call_count == 0) { afr_lookup_entry_heal (frame, this); } return 0; } static void afr_discover_done (call_frame_t *frame, xlator_t *this) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = -1; int op_errno = 0; int read_subvol = 0; priv = this->private; local = frame->local; for (i = 0; i < priv->child_count; i++) { if (!local->replies[i].valid) continue; if (local->replies[i].op_ret == 0) local->op_ret = 0; } op_errno = afr_final_errno (frame->local, this->private); if (local->op_ret < 0) { local->op_errno = op_errno; local->op_ret = -1; goto unwind; } afr_replies_interpret (frame, this, local->inode); read_subvol = afr_data_subvol_get (local->inode, this, 0, 0, NULL); if (read_subvol == -1) { gf_msg (this->name, GF_LOG_WARNING, 0, AFR_MSG_READ_SUBVOL_ERROR, "no read subvols for %s", local->loc.path); for (i = 0; i < priv->child_count; i++) { if (!local->replies[i].valid || local->replies[i].op_ret == -1) continue; read_subvol = i; break; } } unwind: if (read_subvol == -1) { afr_inode_split_brain_choice_get (local->inode, this, &read_subvol); if (read_subvol == -1) read_subvol = 0; } AFR_STACK_UNWIND (lookup, frame, local->op_ret, local->op_errno, local->inode, &local->replies[read_subvol].poststat, local->replies[read_subvol].xdata, &local->replies[read_subvol].postparent); } int afr_discover_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret, int op_errno, inode_t *inode, struct iatt *buf, dict_t *xdata, struct iatt *postparent) { afr_local_t * local = NULL; int call_count = -1; int child_index = -1; child_index = (long) cookie; local = frame->local; local->replies[child_index].valid = 1; local->replies[child_index].op_ret = op_ret; local->replies[child_index].op_errno = op_errno; if (op_ret != -1) { local->replies[child_index].poststat = *buf; local->replies[child_index].postparent = *postparent; if (xdata) local->replies[child_index].xdata = dict_ref (xdata); } if (local->do_discovery && (op_ret == 0)) afr_attempt_local_discovery (this, child_index); call_count = afr_frame_return (frame); if (call_count == 0) { afr_discover_done (frame, this); } return 0; } int afr_discover_do (call_frame_t *frame, xlator_t *this, int err) { int ret = 0; int i = 0; afr_local_t *local = NULL; afr_private_t *priv = NULL; int call_count = 0; local = frame->local; priv = this->private; if (err) { local->op_errno = -err; ret = -1; goto out; } call_count = local->call_count = AFR_COUNT (local->child_up, priv->child_count); ret = afr_lookup_xattr_req_prepare (local, this, local->xattr_req, &local->loc); if (ret) { local->op_errno = -ret; ret = -1; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND_COOKIE (frame, afr_discover_cbk, (void *) (long) i, priv->children[i], priv->children[i]->fops->lookup, &local->loc, local->xattr_req); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (lookup, frame, -1, local->op_errno, 0, 0, 0, 0); return 0; } int afr_discover (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xattr_req) { int op_errno = ENOMEM; afr_private_t *priv = NULL; afr_local_t *local = NULL; int event = 0; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; if (!local->call_count) { op_errno = ENOTCONN; goto out; } if (__is_root_gfid (loc->inode->gfid)) { if (!this->itable) this->itable = loc->inode->table; if (!priv->root_inode) priv->root_inode = inode_ref (loc->inode); if (priv->choose_local && !priv->did_discovery) { /* Logic to detect which subvolumes of AFR are local, in order to prefer them for reads */ local->do_discovery = _gf_true; priv->did_discovery = _gf_true; } } local->op = GF_FOP_LOOKUP; loc_copy (&local->loc, loc); local->inode = inode_ref (loc->inode); if (xattr_req) /* If xattr_req was null, afr_lookup_xattr_req_prepare() will allocate one for us */ local->xattr_req = dict_ref (xattr_req); if (gf_uuid_is_null (loc->inode->gfid)) { afr_discover_do (frame, this, 0); return 0; } afr_read_subvol_get (loc->inode, this, NULL, &event, AFR_DATA_TRANSACTION, NULL); if (event != local->event_generation) afr_inode_refresh (frame, this, loc->inode, afr_discover_do); else afr_discover_do (frame, this, 0); return 0; out: AFR_STACK_UNWIND (lookup, frame, -1, op_errno, NULL, NULL, NULL, NULL); return 0; } int afr_lookup_do (call_frame_t *frame, xlator_t *this, int err) { int ret = 0; int i = 0; afr_local_t *local = NULL; afr_private_t *priv = NULL; int call_count = 0; local = frame->local; priv = this->private; if (err < 0) { local->op_errno = -err; ret = -1; goto out; } call_count = local->call_count = AFR_COUNT (local->child_up, priv->child_count); ret = afr_lookup_xattr_req_prepare (local, this, local->xattr_req, &local->loc); if (ret) { local->op_errno = -ret; ret = -1; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND_COOKIE (frame, afr_lookup_cbk, (void *) (long) i, priv->children[i], priv->children[i]->fops->lookup, &local->loc, local->xattr_req); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (lookup, frame, -1, local->op_errno, 0, 0, 0, 0); return 0; } /* * afr_lookup() * * The goal here is to figure out what the element getting looked up is. * i.e what is the GFID, inode type and a conservative estimate of the * inode attributes are. * * As we lookup, operations may be underway on the entry name and the * inode. In lookup() we are primarily concerned only with the entry * operations. If the entry is getting unlinked or renamed, we detect * what operation is underway by querying for on-going transactions and * pending self-healing on the entry through xdata. * * If the entry is a file/dir, it may need self-heal and/or in a * split-brain condition. Lookup is not the place to worry about these * conditions. Outcast marking will naturally handle them in the read * paths. * * Here is a brief goal of what we are trying to achieve: * * - LOOKUP on all subvolumes concurrently, querying on-going transaction * and pending self-heal info from the servers. * * - If all servers reply the same inode type and GFID, the overall call * MUST be a success. * * - If inode types or GFIDs mismatch, and there IS either an on-going * transaction or pending self-heal, inspect what the nature of the * transaction or pending heal is, and select the appropriate subvolume's * reply as the winner. * * - If inode types or GFIDs mismatch, and there are no on-going transactions * or pending self-heal on the entry name on any of the servers, fail the * lookup with EIO. Something has gone wrong beyond reasonable action. */ int afr_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xattr_req) { afr_local_t *local = NULL; int32_t op_errno = 0; int event = 0; void *gfid_req = NULL; int ret = 0; if (!loc->parent && gf_uuid_is_null (loc->pargfid)) { if (xattr_req) dict_del (xattr_req, "gfid-req"); afr_discover (frame, this, loc, xattr_req); return 0; } if (__is_root_gfid (loc->parent->gfid)) { if (!strcmp (loc->name, GF_REPLICATE_TRASH_DIR)) { op_errno = EPERM; goto out; } } local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; if (!local->call_count) { op_errno = ENOTCONN; goto out; } local->op = GF_FOP_LOOKUP; loc_copy (&local->loc, loc); local->inode = inode_ref (loc->inode); if (xattr_req) { /* If xattr_req was null, afr_lookup_xattr_req_prepare() will allocate one for us */ ret = dict_get_ptr (xattr_req, "gfid-req", &gfid_req); if (ret == 0) { gf_uuid_copy (local->cont.lookup.gfid_req, gfid_req); dict_del (xattr_req, "gfid-req"); } local->xattr_req = dict_ref (xattr_req); } afr_read_subvol_get (loc->parent, this, NULL, &event, AFR_DATA_TRANSACTION, NULL); if (event != local->event_generation) afr_inode_refresh (frame, this, loc->parent, afr_lookup_do); else afr_lookup_do (frame, this, 0); return 0; out: AFR_STACK_UNWIND (lookup, frame, -1, op_errno, NULL, NULL, NULL, NULL); return 0; } /* {{{ open */ afr_fd_ctx_t * __afr_fd_ctx_get (fd_t *fd, xlator_t *this) { uint64_t ctx = 0; int ret = 0; afr_fd_ctx_t *fd_ctx = NULL; ret = __fd_ctx_get (fd, this, &ctx); if (ret < 0) { ret = __afr_fd_ctx_set (this, fd); if (ret < 0) goto out; ret = __fd_ctx_get (fd, this, &ctx); if (ret < 0) goto out; } fd_ctx = (afr_fd_ctx_t *)(long) ctx; out: return fd_ctx; } afr_fd_ctx_t * afr_fd_ctx_get (fd_t *fd, xlator_t *this) { afr_fd_ctx_t *fd_ctx = NULL; LOCK(&fd->lock); { fd_ctx = __afr_fd_ctx_get (fd, this); } UNLOCK(&fd->lock); return fd_ctx; } int __afr_fd_ctx_set (xlator_t *this, fd_t *fd) { afr_private_t * priv = NULL; int ret = -1; uint64_t ctx = 0; afr_fd_ctx_t * fd_ctx = NULL; int i = 0; VALIDATE_OR_GOTO (this->private, out); VALIDATE_OR_GOTO (fd, out); priv = this->private; ret = __fd_ctx_get (fd, this, &ctx); if (ret == 0) goto out; fd_ctx = GF_CALLOC (1, sizeof (afr_fd_ctx_t), gf_afr_mt_afr_fd_ctx_t); if (!fd_ctx) { ret = -ENOMEM; goto out; } for (i = 0; i < AFR_NUM_CHANGE_LOGS; i++) { fd_ctx->pre_op_done[i] = GF_CALLOC (sizeof (*fd_ctx->pre_op_done[i]), priv->child_count, gf_afr_mt_int32_t); if (!fd_ctx->pre_op_done[i]) { ret = -ENOMEM; goto out; } } fd_ctx->opened_on = GF_CALLOC (sizeof (*fd_ctx->opened_on), priv->child_count, gf_afr_mt_int32_t); if (!fd_ctx->opened_on) { ret = -ENOMEM; goto out; } for (i = 0; i < priv->child_count; i++) { if (fd_is_anonymous (fd)) fd_ctx->opened_on[i] = AFR_FD_OPENED; else fd_ctx->opened_on[i] = AFR_FD_NOT_OPENED; } fd_ctx->lock_piggyback = GF_CALLOC (sizeof (*fd_ctx->lock_piggyback), priv->child_count, gf_afr_mt_char); if (!fd_ctx->lock_piggyback) { ret = -ENOMEM; goto out; } fd_ctx->lock_acquired = GF_CALLOC (sizeof (*fd_ctx->lock_acquired), priv->child_count, gf_afr_mt_char); if (!fd_ctx->lock_acquired) { ret = -ENOMEM; goto out; } fd_ctx->readdir_subvol = -1; pthread_mutex_init (&fd_ctx->delay_lock, NULL); INIT_LIST_HEAD (&fd_ctx->eager_locked); ret = __fd_ctx_set (fd, this, (uint64_t)(long) fd_ctx); if (ret) gf_msg_debug (this->name, 0, "failed to set fd ctx (%p)", fd); out: return ret; } int afr_fd_ctx_set (xlator_t *this, fd_t *fd) { int ret = -1; LOCK (&fd->lock); { ret = __afr_fd_ctx_set (this, fd); } UNLOCK (&fd->lock); return ret; } /* {{{ flush */ int afr_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; local = frame->local; LOCK (&frame->lock); { if (op_ret != -1) { local->op_ret = op_ret; if (!local->xdata_rsp && xdata) local->xdata_rsp = dict_ref (xdata); } else { local->op_errno = op_errno; } } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (flush, frame, local->op_ret, local->op_errno, local->xdata_rsp); return 0; } static int afr_flush_wrapper (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata) { int i = 0; afr_local_t *local = NULL; afr_private_t *priv = NULL; int call_count = -1; priv = this->private; local = frame->local; call_count = local->call_count; for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND_COOKIE (frame, afr_flush_cbk, (void *) (long) i, priv->children[i], priv->children[i]->fops->flush, local->fd, xdata); if (!--call_count) break; } } return 0; } int afr_flush (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata) { afr_local_t *local = NULL; call_stub_t *stub = NULL; int op_errno = ENOMEM; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; if (!local->call_count) { op_errno = ENOTCONN; goto out; } local->fd = fd_ref(fd); stub = fop_flush_stub (frame, afr_flush_wrapper, fd, xdata); if (!stub) goto out; afr_delayed_changelog_wake_resume (this, fd, stub); return 0; out: AFR_STACK_UNWIND (flush, frame, -1, op_errno, NULL); return 0; } /* }}} */ int afr_cleanup_fd_ctx (xlator_t *this, fd_t *fd) { uint64_t ctx = 0; afr_fd_ctx_t *fd_ctx = NULL; int ret = 0; int i = 0; ret = fd_ctx_get (fd, this, &ctx); if (ret < 0) goto out; fd_ctx = (afr_fd_ctx_t *)(long) ctx; if (fd_ctx) { //no need to take any locks if (!list_empty (&fd_ctx->eager_locked)) gf_msg (this->name, GF_LOG_WARNING, 0, AFR_MSG_INVALID_DATA, "%s: Stale " "Eager-lock stubs found", uuid_utoa (fd->inode->gfid)); for (i = 0; i < AFR_NUM_CHANGE_LOGS; i++) GF_FREE (fd_ctx->pre_op_done[i]); GF_FREE (fd_ctx->opened_on); GF_FREE (fd_ctx->lock_piggyback); GF_FREE (fd_ctx->lock_acquired); pthread_mutex_destroy (&fd_ctx->delay_lock); GF_FREE (fd_ctx); } out: return 0; } int afr_release (xlator_t *this, fd_t *fd) { afr_cleanup_fd_ctx (this, fd); return 0; } /* {{{ fsync */ int afr_fsync_unwind_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, struct iatt *prebuf, struct iatt *postbuf, dict_t *xdata) { AFR_STACK_UNWIND (fsync, frame, op_ret, op_errno, prebuf, postbuf, xdata); return 0; } int afr_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, struct iatt *prebuf, struct iatt *postbuf, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; int child_index = (long) cookie; int read_subvol = 0; call_stub_t *stub = NULL; local = frame->local; read_subvol = afr_data_subvol_get (local->inode, this, 0, 0, NULL); LOCK (&frame->lock); { if (op_ret == 0) { if (local->op_ret == -1) { local->op_ret = 0; local->cont.inode_wfop.prebuf = *prebuf; local->cont.inode_wfop.postbuf = *postbuf; if (xdata) local->xdata_rsp = dict_ref (xdata); } if (child_index == read_subvol) { local->cont.inode_wfop.prebuf = *prebuf; local->cont.inode_wfop.postbuf = *postbuf; if (xdata) { if (local->xdata_rsp) dict_unref (local->xdata_rsp); local->xdata_rsp = dict_ref (xdata); } } } else { local->op_errno = op_errno; } } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) { /* Make a stub out of the frame, and register it with the waking up post-op. When the call-stub resumes, we are guaranteed that there was no post-op pending (i.e changelogs were unset in the server). This is an essential "guarantee", that fsync() returns only after completely finishing EVERYTHING, including the delayed post-op. This guarantee is expected by FUSE graph switching for example. */ stub = fop_fsync_cbk_stub (frame, afr_fsync_unwind_cbk, local->op_ret, local->op_errno, &local->cont.inode_wfop.prebuf, &local->cont.inode_wfop.postbuf, local->xdata_rsp); if (!stub) { AFR_STACK_UNWIND (fsync, frame, -1, ENOMEM, 0, 0, 0); return 0; } /* If no new unstable writes happened between the time we cleared the unstable write witness flag in afr_fsync and now, calling afr_delayed_changelog_wake_up() should wake up and skip over the fsync phase and go straight to afr_changelog_post_op_now() */ afr_delayed_changelog_wake_resume (this, local->fd, stub); } return 0; } int afr_fsync (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t datasync, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t call_count = 0; int32_t op_errno = ENOMEM; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } local->fd = fd_ref (fd); if (afr_fd_has_witnessed_unstable_write (this, fd)) { /* don't care. we only wanted to CLEAR the bit */ } local->inode = inode_ref (fd->inode); for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND_COOKIE (frame, afr_fsync_cbk, (void *) (long) i, priv->children[i], priv->children[i]->fops->fsync, fd, datasync, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (fsync, frame, -1, op_errno, NULL, NULL, NULL); return 0; } /* }}} */ /* {{{ fsync */ int afr_fsyncdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; local = frame->local; LOCK (&frame->lock); { if (op_ret == 0) { local->op_ret = 0; if (!local->xdata_rsp && xdata) local->xdata_rsp = dict_ref (xdata); } else { local->op_errno = op_errno; } } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (fsyncdir, frame, local->op_ret, local->op_errno, local->xdata_rsp); return 0; } int afr_fsyncdir (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t datasync, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t call_count = 0; int32_t op_errno = ENOMEM; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND (frame, afr_fsyncdir_cbk, priv->children[i], priv->children[i]->fops->fsyncdir, fd, datasync, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (fsyncdir, frame, -1, op_errno, NULL); return 0; } /* }}} */ /* {{{ xattrop */ int32_t afr_xattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xattr, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; local = frame->local; LOCK (&frame->lock); { if (op_ret == 0) { if (!local->cont.xattrop.xattr) local->cont.xattrop.xattr = dict_ref (xattr); if (!local->xdata_rsp && xdata) local->xdata_rsp = dict_ref (xdata); local->op_ret = 0; } local->op_errno = op_errno; } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (xattrop, frame, local->op_ret, local->op_errno, local->cont.xattrop.xattr, local->xdata_rsp); return 0; } int32_t afr_xattrop (call_frame_t *frame, xlator_t *this, loc_t *loc, gf_xattrop_flags_t optype, dict_t *xattr, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t call_count = 0; int32_t op_errno = ENOMEM; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND (frame, afr_xattrop_cbk, priv->children[i], priv->children[i]->fops->xattrop, loc, optype, xattr, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (xattrop, frame, -1, op_errno, NULL, NULL); return 0; } /* }}} */ /* {{{ fxattrop */ int32_t afr_fxattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xattr, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; local = frame->local; LOCK (&frame->lock); { if (op_ret == 0) { if (!local->cont.fxattrop.xattr) local->cont.fxattrop.xattr = dict_ref (xattr); if (!local->xdata_rsp && xdata) local->xdata_rsp = dict_ref (xdata); local->op_ret = 0; } local->op_errno = op_errno; } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (fxattrop, frame, local->op_ret, local->op_errno, local->cont.fxattrop.xattr, local->xdata_rsp); return 0; } int32_t afr_fxattrop (call_frame_t *frame, xlator_t *this, fd_t *fd, gf_xattrop_flags_t optype, dict_t *xattr, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t call_count = 0; int32_t op_errno = 0; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND (frame, afr_fxattrop_cbk, priv->children[i], priv->children[i]->fops->fxattrop, fd, optype, xattr, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (fxattrop, frame, -1, op_errno, NULL, NULL); return 0; } /* }}} */ int32_t afr_unlock_partial_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; afr_private_t *priv = NULL; int call_count = -1; int child_index = (long)cookie; uuid_t gfid = {0}; local = frame->local; priv = this->private; if (op_ret < 0 && op_errno != ENOTCONN) { loc_gfid (&local->loc, gfid); gf_msg (this->name, GF_LOG_ERROR, 0, AFR_MSG_INODE_UNLOCK_FAIL, "%s: Failed to unlock %s " "with lk_owner: %s (%s)", uuid_utoa (gfid), priv->children[child_index]->name, lkowner_utoa (&frame->root->lk_owner), strerror (op_errno)); } call_count = afr_frame_return (frame); if (call_count == 0) { AFR_STACK_UNWIND (inodelk, frame, local->op_ret, local->op_errno, local->xdata_rsp); } return 0; } int32_t afr_unlock_inodelks_and_unwind (call_frame_t *frame, xlator_t *this, int call_count) { int i = 0; afr_private_t *priv = NULL; afr_local_t *local = NULL; local = frame->local; priv = this->private; local->call_count = call_count; local->cont.inodelk.flock.l_type = F_UNLCK; for (i = 0; i < priv->child_count; i++) { if (!local->replies[i].valid) continue; if (local->replies[i].op_ret == -1) continue; STACK_WIND_COOKIE (frame, afr_unlock_partial_inodelk_cbk, (void*) (long) i, priv->children[i], priv->children[i]->fops->inodelk, local->cont.inodelk.volume, &local->loc, local->cont.inodelk.cmd, &local->cont.inodelk.flock, 0); if (!--call_count) break; } return 0; } int32_t afr_inodelk_done (call_frame_t *frame, xlator_t *this) { int i = 0; int lock_count = 0; afr_local_t *local = NULL; afr_private_t *priv = NULL; local = frame->local; priv = this->private; for (i = 0; i < priv->child_count; i++) { if (!local->replies[i].valid) continue; if (local->replies[i].op_ret == 0) lock_count++; if (local->op_ret == -1 && local->op_errno == EAGAIN) continue; if ((local->replies[i].op_ret == -1) && (local->replies[i].op_errno == EAGAIN)) { local->op_ret = -1; local->op_errno = EAGAIN; continue; } if (local->replies[i].op_ret == 0) local->op_ret = 0; local->op_errno = local->replies[i].op_errno; } if (lock_count && local->cont.inodelk.flock.l_type != F_UNLCK && (local->op_ret == -1 && local->op_errno == EAGAIN)) { afr_unlock_inodelks_and_unwind (frame, this, lock_count); } else { AFR_STACK_UNWIND (inodelk, frame, local->op_ret, local->op_errno, local->xdata_rsp); } return 0; } int afr_common_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; int child_index = (long)cookie; local = frame->local; local->replies[child_index].valid = 1; local->replies[child_index].op_ret = op_ret; local->replies[child_index].op_errno = op_errno; if (op_ret == 0 && xdata) { local->replies[child_index].xdata = dict_ref (xdata); LOCK (&frame->lock); { if (!local->xdata_rsp) local->xdata_rsp = dict_ref (xdata); } UNLOCK (&frame->lock); } return 0; } static int32_t afr_parallel_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { int call_count = 0; afr_common_inodelk_cbk (frame, cookie, this, op_ret, op_errno, xdata); call_count = afr_frame_return (frame); if (call_count == 0) afr_inodelk_done (frame, this); return 0; } static inline gf_boolean_t afr_is_conflicting_lock_present (int32_t op_ret, int32_t op_errno) { if (op_ret == -1 && op_errno == EAGAIN) return _gf_true; return _gf_false; } static int32_t afr_serialized_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; afr_private_t *priv = NULL; int child_index = (long)cookie; int next_child = 0; local = frame->local; priv = this->private; afr_common_inodelk_cbk (frame, cookie, this, op_ret, op_errno, xdata); for (next_child = child_index + 1; next_child < priv->child_count; next_child++) { if (local->child_up[next_child]) break; } if (afr_is_conflicting_lock_present (op_ret, op_errno) || (next_child == priv->child_count)) { afr_inodelk_done (frame, this); } else { STACK_WIND_COOKIE (frame, afr_serialized_inodelk_cbk, (void *) (long) next_child, priv->children[next_child], priv->children[next_child]->fops->inodelk, (const char *)local->cont.inodelk.volume, &local->loc, local->cont.inodelk.cmd, &local->cont.inodelk.flock, local->xdata_req); } return 0; } static int afr_parallel_inodelk_wind (call_frame_t *frame, xlator_t *this) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int call_count = 0; int i = 0; priv = this->private; local = frame->local; call_count = local->call_count; for (i = 0; i < priv->child_count; i++) { if (!local->child_up[i]) continue; STACK_WIND_COOKIE (frame, afr_parallel_inodelk_cbk, (void *) (long) i, priv->children[i], priv->children[i]->fops->inodelk, (const char *)local->cont.inodelk.volume, &local->loc, local->cont.inodelk.cmd, &local->cont.inodelk.flock, local->xdata_req); if (!--call_count) break; } return 0; } static int afr_serialized_inodelk_wind (call_frame_t *frame, xlator_t *this) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; priv = this->private; local = frame->local; for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND_COOKIE (frame, afr_serialized_inodelk_cbk, (void *) (long) i, priv->children[i], priv->children[i]->fops->inodelk, (const char *)local->cont.inodelk.volume, &local->loc, local->cont.inodelk.cmd, &local->cont.inodelk.flock, local->xdata_req); break; } } return 0; } int32_t afr_inodelk (call_frame_t *frame, xlator_t *this, const char *volume, loc_t *loc, int32_t cmd, struct gf_flock *flock, dict_t *xdata) { afr_local_t *local = NULL; int32_t op_errno = ENOMEM; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; loc_copy (&local->loc, loc); local->cont.inodelk.volume = gf_strdup (volume); if (!local->cont.inodelk.volume) { op_errno = ENOMEM; goto out; } local->cont.inodelk.cmd = cmd; local->cont.inodelk.flock = *flock; if (xdata) local->xdata_req = dict_ref (xdata); /* At least one child is up */ /* * Non-blocking locks also need to be serialized. Otherwise there is * a chance that both the mounts which issued same non-blocking inodelk * may endup not acquiring the lock on any-brick. * Ex: Mount1 and Mount2 * request for full length lock on file f1. Mount1 afr may acquire the * partial lock on brick-1 and may not acquire the lock on brick-2 * because Mount2 already got the lock on brick-2, vice versa. Since * both the mounts only got partial locks, afr treats them as failure in * gaining the locks and unwinds with EAGAIN errno. */ if (flock->l_type == F_UNLCK) { afr_parallel_inodelk_wind (frame, this); } else { afr_serialized_inodelk_wind (frame, this); } return 0; out: AFR_STACK_UNWIND (inodelk, frame, -1, op_errno, NULL); return 0; } int32_t afr_finodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; local = frame->local; LOCK (&frame->lock); { if (op_ret == 0) local->op_ret = 0; local->op_errno = op_errno; } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (finodelk, frame, local->op_ret, local->op_errno, xdata); return 0; } int32_t afr_finodelk (call_frame_t *frame, xlator_t *this, const char *volume, fd_t *fd, int32_t cmd, struct gf_flock *flock, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t call_count = 0; int32_t op_errno = ENOMEM; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND (frame, afr_finodelk_cbk, priv->children[i], priv->children[i]->fops->finodelk, volume, fd, cmd, flock, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (finodelk, frame, -1, op_errno, NULL); return 0; } int32_t afr_entrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; local = frame->local; LOCK (&frame->lock); { if (op_ret == 0) local->op_ret = 0; local->op_errno = op_errno; } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (entrylk, frame, local->op_ret, local->op_errno, xdata); return 0; } int afr_entrylk (call_frame_t *frame, xlator_t *this, const char *volume, loc_t *loc, const char *basename, entrylk_cmd cmd, entrylk_type type, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t call_count = 0; int32_t op_errno = 0; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND (frame, afr_entrylk_cbk, priv->children[i], priv->children[i]->fops->entrylk, volume, loc, basename, cmd, type, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (entrylk, frame, -1, op_errno, NULL); return 0; } int afr_fentrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, dict_t *xdata) { afr_local_t *local = NULL; int call_count = -1; local = frame->local; LOCK (&frame->lock); { if (op_ret == 0) local->op_ret = 0; local->op_errno = op_errno; } UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (fentrylk, frame, local->op_ret, local->op_errno, xdata); return 0; } int afr_fentrylk (call_frame_t *frame, xlator_t *this, const char *volume, fd_t *fd, const char *basename, entrylk_cmd cmd, entrylk_type type, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t call_count = 0; int32_t op_errno = ENOMEM; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND (frame, afr_fentrylk_cbk, priv->children[i], priv->children[i]->fops->fentrylk, volume, fd, basename, cmd, type, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (fentrylk, frame, -1, op_errno, NULL); return 0; } int afr_statfs_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret, int op_errno, struct statvfs *statvfs, dict_t *xdata) { afr_local_t *local = NULL; int call_count = 0; struct statvfs *buf = NULL; LOCK (&frame->lock); { local = frame->local; if (op_ret != 0) { local->op_errno = op_errno; goto unlock; } local->op_ret = op_ret; buf = &local->cont.statfs.buf; if (local->cont.statfs.buf_set) { if (statvfs->f_bavail < buf->f_bavail) { *buf = *statvfs; if (xdata) { if (local->xdata_rsp) dict_unref (local->xdata_rsp); local->xdata_rsp = dict_ref (xdata); } } } else { *buf = *statvfs; local->cont.statfs.buf_set = 1; if (xdata) local->xdata_rsp = dict_ref (xdata); } } unlock: UNLOCK (&frame->lock); call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (statfs, frame, local->op_ret, local->op_errno, &local->cont.statfs.buf, local->xdata_rsp); return 0; } int afr_statfs (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata) { afr_local_t * local = NULL; afr_private_t *priv = NULL; int i = 0; int call_count = 0; int32_t op_errno = ENOMEM; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; call_count = local->call_count; if (!call_count) { op_errno = ENOTCONN; goto out; } for (i = 0; i < priv->child_count; i++) { if (local->child_up[i]) { STACK_WIND (frame, afr_statfs_cbk, priv->children[i], priv->children[i]->fops->statfs, loc, xdata); if (!--call_count) break; } } return 0; out: AFR_STACK_UNWIND (statfs, frame, -1, op_errno, NULL, NULL); return 0; } int32_t afr_lk_unlock_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, struct gf_flock *lock, dict_t *xdata) { afr_local_t * local = NULL; int call_count = -1; local = frame->local; call_count = afr_frame_return (frame); if (call_count == 0) AFR_STACK_UNWIND (lk, frame, local->op_ret, local->op_errno, lock, xdata); return 0; } int32_t afr_lk_unlock (call_frame_t *frame, xlator_t *this) { afr_local_t * local = NULL; afr_private_t * priv = NULL; int i = 0; int call_count = 0; local = frame->local; priv = this->private; call_count = afr_locked_nodes_count (local->cont.lk.locked_nodes, priv->child_count); if (call_count == 0) { AFR_STACK_UNWIND (lk, frame, local->op_ret, local->op_errno, &local->cont.lk.ret_flock, NULL); return 0; } local->call_count = call_count; local->cont.lk.user_flock.l_type = F_UNLCK; for (i = 0; i < priv->child_count; i++) { if (local->cont.lk.locked_nodes[i]) { STACK_WIND (frame, afr_lk_unlock_cbk, priv->children[i], priv->children[i]->fops->lk, local->fd, F_SETLK, &local->cont.lk.user_flock, NULL); if (!--call_count) break; } } return 0; } int32_t afr_lk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret, int32_t op_errno, struct gf_flock *lock, dict_t *xdata) { afr_local_t *local = NULL; afr_private_t *priv = NULL; int child_index = -1; /* int ret = 0; */ local = frame->local; priv = this->private; child_index = (long) cookie; if (!child_went_down (op_ret, op_errno) && (op_ret == -1)) { local->op_ret = -1; local->op_errno = op_errno; afr_lk_unlock (frame, this); return 0; } if (op_ret == 0) { local->op_ret = 0; local->op_errno = 0; local->cont.lk.locked_nodes[child_index] = 1; local->cont.lk.ret_flock = *lock; } child_index++; if (child_index < priv->child_count) { STACK_WIND_COOKIE (frame, afr_lk_cbk, (void *) (long) child_index, priv->children[child_index], priv->children[child_index]->fops->lk, local->fd, local->cont.lk.cmd, &local->cont.lk.user_flock, xdata); } else if (local->op_ret == -1) { /* all nodes have gone down */ AFR_STACK_UNWIND (lk, frame, -1, ENOTCONN, &local->cont.lk.ret_flock, NULL); } else { AFR_STACK_UNWIND (lk, frame, local->op_ret, local->op_errno, &local->cont.lk.ret_flock, NULL); } return 0; } int afr_lk (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t cmd, struct gf_flock *flock, dict_t *xdata) { afr_private_t *priv = NULL; afr_local_t *local = NULL; int i = 0; int32_t op_errno = ENOMEM; priv = this->private; local = AFR_FRAME_INIT (frame, op_errno); if (!local) goto out; local->cont.lk.locked_nodes = GF_CALLOC (priv->child_count, sizeof (*local->cont.lk.locked_nodes), gf_afr_mt_char); if (!local->cont.lk.locked_nodes) { op_errno = ENOMEM; goto out; } local->fd = fd_ref (fd); local->cont.lk.cmd = cmd; local->cont.lk.user_flock = *flock; local->cont.lk.ret_flock = *flock; STACK_WIND_COOKIE (frame, afr_lk_cbk, (void *) (long) 0, priv->children[i], priv->children[i]->fops->lk, fd, cmd, flock, xdata); return 0; out: AFR_STACK_UNWIND (lk, frame, -1, op_errno, NULL, NULL); return 0; } int afr_forget (xlator_t *this, inode_t *inode) { uint64_t ctx_int = 0; afr_inode_ctx_t *ctx = NULL; afr_spb_choice_timeout_cancel (this, inode); inode_ctx_del (inode, this, &ctx_int); if (!ctx_int) return 0; ctx = (afr_inode_ctx_t *)ctx_int; GF_FREE (ctx); return 0; } int afr_priv_dump (xlator_t *this) { afr_private_t *priv = NULL; char key_prefix[GF_DUMP_MAX_BUF_LEN]; char key[GF_DUMP_MAX_BUF_LEN]; int i = 0; GF_ASSERT (this); priv = this->private; GF_ASSERT (priv); snprintf(key_prefix, GF_DUMP_MAX_BUF_LEN, "%s.%s", this->type, this->name); gf_proc_dump_add_section(key_prefix); gf_proc_dump_write("child_count", "%u", priv->child_count); for (i = 0; i < priv->child_count; i++) { sprintf (key, "child_up[%d]", i); gf_proc_dump_write(key, "%d", priv->child_up[i]); sprintf (key, "pending_key[%d]", i); gf_proc_dump_write(key, "%s", priv->pending_key[i]); } gf_proc_dump_write("data_self_heal", "%s", priv->data_self_heal); gf_proc_dump_write("metadata_self_heal", "%d", priv->metadata_self_heal); gf_proc_dump_write("entry_self_heal", "%d", priv->entry_self_heal); gf_proc_dump_write("data_change_log", "%d", priv->data_change_log); gf_proc_dump_write("metadata_change_log", "%d", priv->metadata_change_log); gf_proc_dump_write("entry-change_log", "%d", priv->entry_change_log); gf_proc_dump_write("read_child", "%d", priv->read_child); gf_proc_dump_write("favorite_child", "%d", priv->favorite_child); gf_proc_dump_write("wait_count", "%u", priv->wait_count); gf_proc_dump_write("quorum-reads", "%d", priv->quorum_reads); return 0; } /** * find_child_index - find the child's index in the array of subvolumes * @this: AFR * @child: child */ static int find_child_index (xlator_t *this, xlator_t *child) { afr_private_t *priv = NULL; int i = -1; priv = this->private; for (i = 0; i < priv->child_count; i++) { if ((xlator_t *) child == priv->children[i]) break; } return i; } int32_t afr_notify (xlator_t *this, int32_t event, void *data, void *data2) { afr_private_t *priv = NULL; int i = -1; int up_children = 0; int down_children = 0; int propagate = 0; int had_heard_from_all = 0; int have_heard_from_all = 0; int idx = -1; int ret = -1; int call_psh = 0; int up_child = -1; dict_t *input = NULL; dict_t *output = NULL; gf_boolean_t had_quorum = _gf_false; gf_boolean_t has_quorum = _gf_false; priv = this->private; if (!priv) return 0; /* * We need to reset this in case children come up in "staggered" * fashion, so that we discover a late-arriving local subvolume. Note * that we could end up issuing N lookups to the first subvolume, and * O(N^2) overall, but N is small for AFR so it shouldn't be an issue. */ priv->did_discovery = _gf_false; had_heard_from_all = 1; for (i = 0; i < priv->child_count; i++) { if (!priv->last_event[i]) { had_heard_from_all = 0; } } /* parent xlators dont need to know about every child_up, child_down * because of afr ha. If all subvolumes go down, child_down has * to be triggered. In that state when 1 subvolume comes up child_up * needs to be triggered. dht optimizes revalidate lookup by sending * it only to one of its subvolumes. When child up/down happens * for afr's subvolumes dht should be notified by child_modified. The * subsequent revalidate lookup happens on all the dht's subvolumes * which triggers afr self-heals if any. */ idx = find_child_index (this, data); if (idx < 0) { gf_msg (this->name, GF_LOG_ERROR, 0, AFR_MSG_INVALID_CHILD_UP, "Received child_up from invalid subvolume"); goto out; } had_quorum = priv->quorum_count && afr_has_quorum (priv->child_up, this); switch (event) { case GF_EVENT_CHILD_UP: LOCK (&priv->lock); { /* * This only really counts if the child was never up * (value = -1) or had been down (value = 0). See * comment at GF_EVENT_CHILD_DOWN for a more detailed * explanation. */ if (priv->child_up[idx] != 1) { priv->up_count++; priv->event_generation++; } priv->child_up[idx] = 1; call_psh = 1; up_child = idx; for (i = 0; i < priv->child_count; i++) if (priv->child_up[i] == 1) up_children++; if (up_children == 1) { gf_msg (this->name, GF_LOG_INFO, 0, AFR_MSG_SUBVOL_UP, "Subvolume '%s' came back up; " "going online.", ((xlator_t *)data)->name); } else { event = GF_EVENT_CHILD_MODIFIED; } priv->last_event[idx] = event; } UNLOCK (&priv->lock); break; case GF_EVENT_CHILD_DOWN: LOCK (&priv->lock); { /* * If a brick is down when we start, we'll get a * CHILD_DOWN to indicate its initial state. There * was never a CHILD_UP in this case, so if we * increment "down_count" the difference between than * and "up_count" will no longer be the number of * children that are currently up. This has serious * implications e.g. for quorum enforcement, so we * don't increment these values unless the event * represents an actual state transition between "up" * (value = 1) and anything else. */ if (priv->child_up[idx] == 1) { priv->down_count++; priv->event_generation++; } priv->child_up[idx] = 0; for (i = 0; i < priv->child_count; i++) if (priv->child_up[i] == 0) down_children++; if (down_children == priv->child_count) { gf_msg (this->name, GF_LOG_ERROR, 0, AFR_MSG_ALL_SUBVOLS_DOWN, "All subvolumes are down. Going offline " "until atleast one of them comes back up."); } else { event = GF_EVENT_CHILD_MODIFIED; } priv->last_event[idx] = event; } UNLOCK (&priv->lock); break; case GF_EVENT_CHILD_CONNECTING: LOCK (&priv->lock); { priv->last_event[idx] = event; } UNLOCK (&priv->lock); break; case GF_EVENT_TRANSLATOR_OP: input = data; output = data2; if (!had_heard_from_all) { ret = -1; goto out; } ret = afr_xl_op (this, input, output); goto out; break; default: propagate = 1; break; } if (priv->quorum_count) { has_quorum = afr_has_quorum (priv->child_up, this); if (!had_quorum && has_quorum) gf_msg (this->name, GF_LOG_INFO, 0, AFR_MSG_QUORUM_MET, "Client-quorum is met"); if (had_quorum && !has_quorum) gf_msg (this->name, GF_LOG_WARNING, 0, AFR_MSG_QUORUM_FAIL, "Client-quorum is not met"); } /* have all subvolumes reported status once by now? */ have_heard_from_all = 1; for (i = 0; i < priv->child_count; i++) { if (!priv->last_event[i]) have_heard_from_all = 0; } /* if all subvols have reported status, no need to hide anything or wait for anything else. Just propagate blindly */ if (have_heard_from_all) propagate = 1; if (!had_heard_from_all && have_heard_from_all) { /* This is the first event which completes aggregation of events from all subvolumes. If at least one subvol had come up, propagate CHILD_UP, but only this time */ event = GF_EVENT_CHILD_DOWN; LOCK (&priv->lock); { up_children = AFR_COUNT (priv->child_up, priv->child_count); for (i = 0; i < priv->child_count; i++) { if (priv->last_event[i] == GF_EVENT_CHILD_UP) { event = GF_EVENT_CHILD_UP; break; } if (priv->last_event[i] == GF_EVENT_CHILD_CONNECTING) { event = GF_EVENT_CHILD_CONNECTING; /* continue to check other events for CHILD_UP */ } } } UNLOCK (&priv->lock); } ret = 0; if (propagate) ret = default_notify (this, event, data); if (!had_heard_from_all && have_heard_from_all && priv->shd.iamshd) { /* * Since self-heal is supposed to be launched only after * the responses from all the bricks are collected, * launch self-heals now on all up subvols. */ for (i = 0; i < priv->child_count; i++) if (priv->child_up[i]) afr_selfheal_childup (this, i); } else if (have_heard_from_all && call_psh && priv->shd.iamshd) { /* * Already heard from everyone. Just launch heal on now up * subvolume. */ afr_selfheal_childup (this, up_child); } out: return ret; } int afr_local_init (afr_local_t *local, afr_private_t *priv, int32_t *op_errno) { local->op_ret = -1; local->op_errno = EUCLEAN; syncbarrier_init (&local->barrier); local->child_up = GF_CALLOC (priv->child_count, sizeof (*local->child_up), gf_afr_mt_char); if (!local->child_up) { if (op_errno) *op_errno = ENOMEM; goto out; } memcpy (local->child_up, priv->child_up, sizeof (*local->child_up) * priv->child_count); local->call_count = AFR_COUNT (local->child_up, priv->child_count); if (local->call_count == 0) { gf_msg (THIS->name, GF_LOG_INFO, 0, AFR_MSG_ALL_SUBVOLS_DOWN, "no subvolumes up"); if (op_errno) *op_errno = ENOTCONN; goto out; } local->event_generation = priv->event_generation; local->read_attempted = GF_CALLOC (priv->child_count, sizeof (char), gf_afr_mt_char); if (!local->read_attempted) { if (op_errno) *op_errno = ENOMEM; goto out; } local->readable = GF_CALLOC (priv->child_count, sizeof (char), gf_afr_mt_char); if (!local->readable) { if (op_errno) *op_errno = ENOMEM; goto out; } local->replies = GF_CALLOC(priv->child_count, sizeof(*local->replies), gf_afr_mt_reply_t); if (!local->replies) { if (op_errno) *op_errno = ENOMEM; goto out; } return 0; out: return -1; } int afr_internal_lock_init (afr_internal_lock_t *lk, size_t child_count, transaction_lk_type_t lk_type) { int ret = -ENOMEM; lk->locked_nodes = GF_CALLOC (sizeof (*lk->locked_nodes), child_count, gf_afr_mt_char); if (NULL == lk->locked_nodes) goto out; lk->lower_locked_nodes = GF_CALLOC (sizeof (*lk->lower_locked_nodes), child_count, gf_afr_mt_char); if (NULL == lk->lower_locked_nodes) goto out; lk->lock_op_ret = -1; lk->lock_op_errno = EUCLEAN; lk->transaction_lk_type = lk_type; ret = 0; out: return ret; } void afr_matrix_cleanup (int32_t **matrix, unsigned int m) { int i = 0; if (!matrix) goto out; for (i = 0; i < m; i++) { GF_FREE (matrix[i]); } GF_FREE (matrix); out: return; } int32_t** afr_matrix_create (unsigned int m, unsigned int n) { int32_t **matrix = NULL; int i = 0; matrix = GF_CALLOC (sizeof (*matrix), m, gf_afr_mt_int32_t); if (!matrix) goto out; for (i = 0; i < m; i++) { matrix[i] = GF_CALLOC (sizeof (*matrix[i]), n, gf_afr_mt_int32_t); if (!matrix[i]) goto out; } return matrix; out: afr_matrix_cleanup (matrix, m); return NULL; } int afr_inodelk_init (afr_inodelk_t *lk, char *dom, size_t child_count) { int ret = -ENOMEM; lk->domain = dom; lk->locked_nodes = GF_CALLOC (sizeof (*lk->locked_nodes), child_count, gf_afr_mt_char); if (NULL == lk->locked_nodes) goto out; ret = 0; out: return ret; } int afr_transaction_local_init (afr_local_t *local, xlator_t *this) { int child_up_count = 0; int ret = -ENOMEM; afr_private_t *priv = NULL; priv = this->private; ret = afr_internal_lock_init (&local->internal_lock, priv->child_count, AFR_TRANSACTION_LK); if (ret < 0) goto out; if ((local->transaction.type == AFR_DATA_TRANSACTION) || (local->transaction.type == AFR_METADATA_TRANSACTION)) { ret = afr_inodelk_init (&local->internal_lock.inodelk[0], this->name, priv->child_count); if (ret < 0) goto out; } ret = -ENOMEM; child_up_count = AFR_COUNT (local->child_up, priv->child_count); if (priv->optimistic_change_log && child_up_count == priv->child_count) local->optimistic_change_log = 1; local->pre_op_compat = priv->pre_op_compat; local->transaction.eager_lock = GF_CALLOC (sizeof (*local->transaction.eager_lock), priv->child_count, gf_afr_mt_int32_t); if (!local->transaction.eager_lock) goto out; local->transaction.pre_op = GF_CALLOC (sizeof (*local->transaction.pre_op), priv->child_count, gf_afr_mt_char); if (!local->transaction.pre_op) goto out; if (priv->arbiter_count == 1) { local->transaction.pre_op_xdata = GF_CALLOC (sizeof (*local->transaction.pre_op_xdata), priv->child_count, gf_afr_mt_dict_t); if (!local->transaction.pre_op_xdata) goto out; local->transaction.pre_op_sources = GF_CALLOC (sizeof (*local->transaction.pre_op_sources), priv->child_count, gf_afr_mt_char); if (!local->transaction.pre_op_sources) goto out; } local->transaction.fop_subvols = GF_CALLOC (sizeof (*local->transaction.fop_subvols), priv->child_count, gf_afr_mt_char); if (!local->transaction.fop_subvols) goto out; local->transaction.failed_subvols = GF_CALLOC (sizeof (*local->transaction.failed_subvols), priv->child_count, gf_afr_mt_char); if (!local->transaction.failed_subvols) goto out; local->pending = afr_matrix_create (priv->child_count, AFR_NUM_CHANGE_LOGS); if (!local->pending) goto out; INIT_LIST_HEAD (&local->transaction.eager_locked); ret = 0; out: return ret; } void afr_set_low_priority (call_frame_t *frame) { frame->root->pid = LOW_PRIO_PROC_PID; } gf_boolean_t afr_have_quorum (char *logname, afr_private_t *priv) { unsigned int quorum = 0; GF_VALIDATE_OR_GOTO(logname,priv,out); quorum = priv->quorum_count; if (quorum != AFR_QUORUM_AUTO) { return (priv->up_count >= (priv->down_count + quorum)); } quorum = priv->child_count / 2 + 1; if (priv->up_count >= (priv->down_count + quorum)) { return _gf_true; } /* * Special case for even numbers of nodes: if we have exactly half * and that includes the first ("senior-most") node, then that counts * as quorum even if it wouldn't otherwise. This supports e.g. N=2 * while preserving the critical property that there can only be one * such group. */ if ((priv->child_count % 2) == 0) { quorum = priv->child_count / 2; if (priv->up_count >= (priv->down_count + quorum)) { if (priv->child_up[0]) { return _gf_true; } } } out: return _gf_false; } void afr_priv_destroy (afr_private_t *priv) { int i = 0; if (!priv) goto out; GF_FREE (priv->last_event); if (priv->pending_key) { for (i = 0; i < priv->child_count; i++) GF_FREE (priv->pending_key[i]); } GF_FREE (priv->pending_key); GF_FREE (priv->children); GF_FREE (priv->child_up); LOCK_DESTROY (&priv->lock); GF_FREE (priv); out: return; } void afr_handle_open_fd_count (call_frame_t *frame, xlator_t *this) { afr_local_t *local = NULL; afr_fd_ctx_t *fd_ctx = NULL; local = frame->local; if (!local->fd) return; fd_ctx = afr_fd_ctx_get (local->fd, this); if (!fd_ctx) return; fd_ctx->open_fd_count = local->open_fd_count; } int** afr_mark_pending_changelog (afr_private_t *priv, unsigned char *pending, dict_t *xattr, ia_type_t iat) { int i = 0; int **changelog = NULL; int idx = -1; int m_idx = 0; int ret = 0; m_idx = afr_index_for_transaction_type (AFR_METADATA_TRANSACTION); idx = afr_index_from_ia_type (iat); changelog = afr_matrix_create (priv->child_count, AFR_NUM_CHANGE_LOGS); if (!changelog) goto out; for (i = 0; i < priv->child_count; i++) { if (!pending[i]) continue; changelog[i][m_idx] = hton32(1); if (idx != -1) changelog[i][idx] = hton32(1); } ret = afr_set_pending_dict (priv, xattr, changelog); if (ret < 0) { afr_matrix_cleanup (changelog, priv->child_count); return NULL; } out: return changelog; } gf_boolean_t afr_decide_heal_info (afr_private_t *priv, unsigned char *sources, int ret) { int sources_count = 0; if (ret) goto out; sources_count = AFR_COUNT (sources, priv->child_count); if (sources_count == priv->child_count) return _gf_false; out: return _gf_true; } int afr_selfheal_locked_metadata_inspect (call_frame_t *frame, xlator_t *this, inode_t *inode, gf_boolean_t *msh) { int ret = -1; unsigned char *locked_on = NULL; unsigned char *sources = NULL; unsigned char *sinks = NULL; unsigned char *healed_sinks = NULL; struct afr_reply *locked_replies = NULL; afr_private_t *priv = this->private; locked_on = alloca0 (priv->child_count); sources = alloca0 (priv->child_count); sinks = alloca0 (priv->child_count); healed_sinks = alloca0 (priv->child_count); locked_replies = alloca0 (sizeof (*locked_replies) * priv->child_count); ret = afr_selfheal_inodelk (frame, this, inode, this->name, LLONG_MAX - 1, 0, locked_on); { if (ret == 0) { /* Not a single lock */ ret = -afr_final_errno (frame->local, priv); if (ret == 0) ret = -ENOTCONN;/* all invalid responses */ goto out; } ret = __afr_selfheal_metadata_prepare (frame, this, inode, locked_on, sources, sinks, healed_sinks, locked_replies); *msh = afr_decide_heal_info (priv, sources, ret); } afr_selfheal_uninodelk (frame, this, inode, this->name, LLONG_MAX - 1, 0, locked_on); out: if (locked_replies) afr_replies_wipe (locked_replies, priv->child_count); return ret; } int afr_selfheal_locked_data_inspect (call_frame_t *frame, xlator_t *this, inode_t *inode, gf_boolean_t *dsh) { int ret = -1; afr_private_t *priv = NULL; unsigned char *locked_on = NULL; unsigned char *data_lock = NULL; unsigned char *sources = NULL; unsigned char *sinks = NULL; unsigned char *healed_sinks = NULL; struct afr_reply *locked_replies = NULL; priv = this->private; locked_on = alloca0 (priv->child_count); data_lock = alloca0 (priv->child_count); sources = alloca0 (priv->child_count); sinks = alloca0 (priv->child_count); healed_sinks = alloca0 (priv->child_count); locked_replies = alloca0 (sizeof (*locked_replies) * priv->child_count); ret = afr_selfheal_tryinodelk (frame, this, inode, priv->sh_domain, 0, 0, locked_on); { if (ret == 0) { ret = -afr_final_errno (frame->local, priv); if (ret == 0) ret = -ENOTCONN;/* all invalid responses */ goto out; } ret = afr_selfheal_inodelk (frame, this, inode, this->name, 0, 0, data_lock); { if (ret == 0) { ret = -afr_final_errno (frame->local, priv); if (ret == 0) ret = -ENOTCONN; /* all invalid responses */ goto unlock; } ret = __afr_selfheal_data_prepare (frame, this, inode, data_lock, sources, sinks, healed_sinks, locked_replies); *dsh = afr_decide_heal_info (priv, sources, ret); } afr_selfheal_uninodelk (frame, this, inode, this->name, 0, 0, data_lock); } unlock: afr_selfheal_uninodelk (frame, this, inode, priv->sh_domain, 0, 0, locked_on); out: if (locked_replies) afr_replies_wipe (locked_replies, priv->child_count); return ret; } int afr_selfheal_locked_entry_inspect (call_frame_t *frame, xlator_t *this, inode_t *inode, gf_boolean_t *esh) { int ret = -1; int source = -1; afr_private_t *priv = NULL; unsigned char *locked_on = NULL; unsigned char *data_lock = NULL; unsigned char *sources = NULL; unsigned char *sinks = NULL; unsigned char *healed_sinks = NULL; struct afr_reply *locked_replies = NULL; priv = this->private; locked_on = alloca0 (priv->child_count); data_lock = alloca0 (priv->child_count); sources = alloca0 (priv->child_count); sinks = alloca0 (priv->child_count); healed_sinks = alloca0 (priv->child_count); locked_replies = alloca0 (sizeof (*locked_replies) * priv->child_count); ret = afr_selfheal_tryentrylk (frame, this, inode, priv->sh_domain, NULL, locked_on); { if (ret == 0) { ret = -afr_final_errno (frame->local, priv); if (ret == 0) ret = -ENOTCONN;/* all invalid responses */ goto out; } ret = afr_selfheal_entrylk (frame, this, inode, this->name, NULL, data_lock); { if (ret == 0) { ret = -afr_final_errno (frame->local, priv); if (ret == 0) ret = -ENOTCONN; /* all invalid responses */ goto unlock; } ret = __afr_selfheal_entry_prepare (frame, this, inode, data_lock, sources, sinks, healed_sinks, locked_replies, &source); if ((ret == 0) && source < 0) ret = -EIO; *esh = afr_decide_heal_info (priv, sources, ret); } afr_selfheal_unentrylk (frame, this, inode, this->name, NULL, data_lock); } unlock: afr_selfheal_unentrylk (frame, this, inode, priv->sh_domain, NULL, locked_on); out: if (locked_replies) afr_replies_wipe (locked_replies, priv->child_count); return ret; } int afr_selfheal_locked_inspect (call_frame_t *frame, xlator_t *this, uuid_t gfid, inode_t **inode, gf_boolean_t *entry_selfheal, gf_boolean_t *data_selfheal, gf_boolean_t *metadata_selfheal) { int ret = -1; gf_boolean_t dsh = _gf_false; gf_boolean_t msh = _gf_false; gf_boolean_t esh = _gf_false; ret = afr_selfheal_unlocked_inspect (frame, this, gfid, inode, &dsh, &msh, &esh); if (ret) goto out; /* For every heal type hold locks and check if it indeed needs heal */ if (msh) { ret = afr_selfheal_locked_metadata_inspect (frame, this, *inode, &msh); if (ret == -EIO) goto out; } if (dsh) { ret = afr_selfheal_locked_data_inspect (frame, this, *inode, &dsh); if (ret == -EIO || (ret == -EAGAIN)) goto out; } if (esh) { ret = afr_selfheal_locked_entry_inspect (frame, this, *inode, &esh); } out: *data_selfheal = dsh; *entry_selfheal = esh; *metadata_selfheal = msh; return ret; } dict_t* afr_set_heal_info (char *status) { dict_t *dict = NULL; int ret = -1; dict = dict_new (); if (!dict) { ret = -ENOMEM; goto out; } if (!strcmp (status, "heal")) { ret = dict_set_str (dict, "heal-info", "heal"); if (ret) gf_msg ("", GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "Failed to set heal-info key to " "heal"); } else if (!strcmp (status, "split-brain")) { ret = dict_set_str (dict, "heal-info", "split-brain"); if (ret) gf_msg ("", GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "Failed to set heal-info key to " "split-brain"); } else if (!strcmp (status, "possibly-healing")) { ret = dict_set_str (dict, "heal-info", "possibly-healing"); if (ret) gf_msg ("", GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "Failed to set heal-info key to " "possibly-healing"); } out: return dict; } int afr_get_heal_info (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata) { gf_boolean_t data_selfheal = _gf_false; gf_boolean_t metadata_selfheal = _gf_false; gf_boolean_t entry_selfheal = _gf_false; dict_t *dict = NULL; int ret = -1; int op_errno = 0; inode_t *inode = NULL; ret = afr_selfheal_locked_inspect (frame, this, loc->gfid, &inode, &entry_selfheal, &data_selfheal, &metadata_selfheal); if (ret == -ENOMEM) { op_errno = -ret; ret = -1; goto out; } if (ret == -EIO) { dict = afr_set_heal_info ("split-brain"); } else if (ret == -EAGAIN) { dict = afr_set_heal_info ("possibly-healing"); } else if (ret >= 0) { /* value of ret = source index * so ret >= 0 and at least one of the 3 booleans set to * true means a source is identified; heal is required. */ if (!data_selfheal && !entry_selfheal && !metadata_selfheal) { dict = afr_set_heal_info ("no-heal"); } else { dict = afr_set_heal_info ("heal"); } } else if (ret < 0) { /* Apart from above checked -ve ret values, there are * other possible ret values like ENOTCONN * (returned when number of valid replies received are * less than 2) * in which case heal is required when one of the * selfheal booleans is set. */ if (data_selfheal || entry_selfheal || metadata_selfheal) { dict = afr_set_heal_info ("heal"); } } ret = 0; out: AFR_STACK_UNWIND (getxattr, frame, ret, op_errno, dict, NULL); if (dict) dict_unref (dict); if (inode) { inode_forget (inode, 1); inode_unref (inode); } return ret; } int _afr_is_split_brain (call_frame_t *frame, xlator_t *this, struct afr_reply *replies, afr_transaction_type type, gf_boolean_t *spb) { afr_private_t *priv = NULL; uint64_t *witness = NULL; unsigned char *sources = NULL; unsigned char *sinks = NULL; int sources_count = 0; int ret = 0; priv = this->private; sources = alloca0 (priv->child_count); sinks = alloca0 (priv->child_count); witness = alloca0(priv->child_count * sizeof (*witness)); ret = afr_selfheal_find_direction (frame, this, replies, type, priv->child_up, sources, sinks, witness); if (ret) return ret; sources_count = AFR_COUNT (sources, priv->child_count); if (!sources_count) *spb = _gf_true; return ret; } int afr_is_split_brain (call_frame_t *frame, xlator_t *this, inode_t *inode, uuid_t gfid, gf_boolean_t *d_spb, gf_boolean_t *m_spb) { int ret = -1; afr_private_t *priv = NULL; struct afr_reply *replies = NULL; priv = this->private; replies = alloca0 (sizeof (*replies) * priv->child_count); ret = afr_selfheal_unlocked_discover (frame, inode, gfid, replies); if (ret) goto out; ret = _afr_is_split_brain (frame, this, replies, AFR_DATA_TRANSACTION, d_spb); if (ret) goto out; ret = _afr_is_split_brain (frame, this, replies, AFR_METADATA_TRANSACTION, m_spb); out: if (replies) { afr_replies_wipe (replies, priv->child_count); replies = NULL; } return ret; } int afr_get_split_brain_status (call_frame_t *frame, xlator_t *this, loc_t *loc) { gf_boolean_t d_spb = _gf_false; gf_boolean_t m_spb = _gf_false; int ret = -1; int op_errno = 0; int i = 0; char *choices = NULL; char *status = NULL; dict_t *dict = NULL; inode_t *inode = NULL; afr_private_t *priv = NULL; xlator_t **children = NULL; priv = this->private; children = priv->children; inode = afr_inode_find (this, loc->gfid); if (!inode) goto out; /* Calculation for string length : * (child_count X length of child-name) + strlen (" Choices :") * child-name consists of : * a) 256 = max characters for volname according to GD_VOLUME_NAME_MAX * b) strlen ("-client-00,") assuming 16 replicas */ choices = alloca0 (priv->child_count * (256 + strlen ("-client-00,")) + strlen (" Choices:")); ret = afr_is_split_brain (frame, this, inode, loc->gfid, &d_spb, &m_spb); if (ret) { op_errno = -ret; ret = -1; goto out; } dict = dict_new (); if (!dict) { op_errno = ENOMEM; ret = -1; goto out; } if (d_spb || m_spb) { sprintf (choices, " Choices:"); for (i = 0; i < priv->child_count; i++) { strcat (choices, children[i]->name); strcat (choices, ","); } choices[strlen (choices) - 1] = '\0'; ret = gf_asprintf (&status, "data-split-brain:%s " "metadata-split-brain:%s%s", (d_spb) ? "yes" : "no", (m_spb) ? "yes" : "no", choices); if (-1 == ret) { op_errno = ENOMEM; goto out; } ret = dict_set_dynstr (dict, GF_AFR_SBRAIN_STATUS, status); if (ret) goto out; } else { ret = dict_set_str (dict, GF_AFR_SBRAIN_STATUS, "The file is not under data or" " metadata split-brain"); if (ret) goto out; } ret = 0; out: AFR_STACK_UNWIND (getxattr, frame, ret, op_errno, dict, NULL); if (dict) dict_unref (dict); if (inode) inode_unref (inode); return ret; } int32_t afr_heal_splitbrain_file(call_frame_t *frame, xlator_t *this, loc_t *loc) { int ret = 0; int op_errno = 0; dict_t *dict = NULL; afr_local_t *local = NULL; local = frame->local; dict = dict_new (); if (!dict) { op_errno = ENOMEM; ret = -1; goto out; } ret = afr_selfheal_do (frame, this, loc->gfid); if (ret == 1 || ret == 2) { ret = dict_set_str (dict, "sh-fail-msg", "File not in split-brain"); if (ret) gf_msg (this->name, GF_LOG_WARNING, -ret, AFR_MSG_DICT_SET_FAILED, "Failed to set sh-fail-msg in dict"); ret = 0; goto out; } else { if (local->xdata_rsp) { /* 'sh-fail-msg' has been set in the dict during self-heal.*/ dict_copy (local->xdata_rsp, dict); ret = 0; } else if (ret < 0) { op_errno = -ret; ret = -1; } } out: if (local->op == GF_FOP_GETXATTR) AFR_STACK_UNWIND (getxattr, frame, ret, op_errno, dict, NULL); else if (local->op == GF_FOP_SETXATTR) AFR_STACK_UNWIND (setxattr, frame, ret, op_errno, NULL); if (dict) dict_unref(dict); return ret; } int afr_get_child_index_from_name (xlator_t *this, char *name) { afr_private_t *priv = this->private; int index = -1; for (index = 0; index < priv->child_count; index++) { if (!strcmp (priv->children[index]->name, name)) goto out; } index = -1; out: return index; }