diff options
Diffstat (limited to 'xlators/cluster/afr/src/afr-lk-common.c')
| -rw-r--r-- | xlators/cluster/afr/src/afr-lk-common.c | 1657 |
1 files changed, 1657 insertions, 0 deletions
diff --git a/xlators/cluster/afr/src/afr-lk-common.c b/xlators/cluster/afr/src/afr-lk-common.c new file mode 100644 index 00000000000..dc850d38fc0 --- /dev/null +++ b/xlators/cluster/afr/src/afr-lk-common.c @@ -0,0 +1,1657 @@ +/* + Copyright (c) 2007-2009 Gluster, Inc. <http://www.gluster.com> + This file is part of GlusterFS. + + GlusterFS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3 of the License, + or (at your option) any later version. + + GlusterFS is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see + <http://www.gnu.org/licenses/>. +*/ + +#include "dict.h" +#include "byte-order.h" +#include "common-utils.h" + +#include "afr.h" +#include "afr-transaction.h" + +#include <signal.h> + + +#define LOCKED_NO 0x0 /* no lock held */ +#define LOCKED_YES 0x1 /* for DATA, METADATA, ENTRY and higher_path */ +#define LOCKED_LOWER 0x2 /* for lower path */ + +int +afr_lock_blocking (call_frame_t *frame, xlator_t *this, int child_index); + +static uint64_t afr_lock_number = 1; + +static uint64_t +get_afr_lock_number () +{ + return (++afr_lock_number); +} + +int +afr_set_lock_number (call_frame_t *frame, xlator_t *this) +{ + afr_local_t *local = NULL; + afr_internal_lock_t *int_lock = NULL; + + local = frame->local; + int_lock = &local->internal_lock; + + int_lock->lock_number = get_afr_lock_number (); + + return 0; +} + +void +afr_set_lk_owner (call_frame_t *frame, xlator_t *this) +{ + if (!frame->root->lk_owner) { + gf_log (this->name, GF_LOG_TRACE, + "Setting lk-owner=%llu", + (unsigned long long) frame->root); + frame->root->lk_owner = (uint64_t) frame->root; + } +} + +static int +is_afr_lock_selfheal (afr_local_t *local) +{ + afr_internal_lock_t *int_lock = NULL; + int ret = -1; + + int_lock = &local->internal_lock; + + switch (int_lock->selfheal_lk_type) { + case AFR_DATA_SELF_HEAL_LK: + case AFR_METADATA_SELF_HEAL_LK: + ret = 1; + break; + case AFR_ENTRY_SELF_HEAL_LK: + ret = 0; + break; + } + + return ret; + +} + +int32_t +internal_lock_count (call_frame_t *frame, xlator_t *this, + afr_fd_ctx_t *fd_ctx) +{ + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + int32_t call_count = 0; + int i = 0; + + local = frame->local; + priv = this->private; + + if (fd_ctx) { + GF_ASSERT (local->fd); + for (i = 0; i < priv->child_count; i++) { + if (local->child_up[i] && fd_ctx->opened_on[i]) + ++call_count; + } + } else { + for (i = 0; i < priv->child_count; i++) { + if (local->child_up[i]) + ++call_count; + } + } + + return call_count; +} + +static void +afr_print_inodelk (char *str, int size, int cmd, + struct flock *flock, uint64_t owner) +{ + char *cmd_str = NULL; + char *type_str = NULL; + + switch (cmd) { +#if F_GETLK != F_GETLK64 + case F_GETLK64: +#endif + case F_GETLK: + cmd_str = "GETLK"; + break; + +#if F_SETLK != F_SETLK64 + case F_SETLK64: +#endif + case F_SETLK: + cmd_str = "SETLK"; + break; + +#if F_SETLKW != F_SETLKW64 + case F_SETLKW64: +#endif + case F_SETLKW: + cmd_str = "SETLKW"; + break; + + default: + cmd_str = "<null>"; + break; + } + + switch (flock->l_type) { + case F_RDLCK: + type_str = "READ"; + break; + case F_WRLCK: + type_str = "WRITE"; + break; + case F_UNLCK: + type_str = "UNLOCK"; + break; + default: + type_str = "UNKNOWN"; + break; + } + + snprintf (str, size, "lock=INODELK, cmd=%s, type=%s, " + "start=%llu, len=%llu, pid=%llu, lk-owner=%llu", + cmd_str, type_str, (unsigned long long) flock->l_start, + (unsigned long long) flock->l_len, + (unsigned long long) flock->l_pid, + (unsigned long long) owner); + +} + +static void +afr_print_lockee (char *str, int size, loc_t *loc, fd_t *fd, + int child_index) +{ + snprintf (str, size, "path=%s, fd=%p, child=%d", + loc->path ? loc->path : "<nul>", + fd ? fd : NULL, + child_index); +} + +void +afr_print_entrylk (char *str, int size, const char *basename, + uint64_t owner) +{ + snprintf (str, size, "Basename=%s, lk-owner=%llu", + basename ? basename : "<nul>", + (unsigned long long)owner); +} + +static void +afr_print_verdict (int op_ret, int op_errno, char *str) +{ + if (op_ret < 0) { + if (op_errno == EAGAIN) + strcpy (str, "EAGAIN"); + else + strcpy (str, "FAILED"); + } + else + strcpy (str, "GRANTED"); +} + +static void +afr_set_lock_call_type (afr_lock_call_type_t lock_call_type, + char *lock_call_type_str, + afr_internal_lock_t *int_lock) +{ + switch (lock_call_type) { + case AFR_INODELK_TRANSACTION: + if (int_lock->transaction_lk_type == AFR_TRANSACTION_LK) + strcpy (lock_call_type_str, "AFR_INODELK_TRANSACTION"); + else + strcpy (lock_call_type_str, "AFR_INODELK_SELFHEAL"); + break; + case AFR_INODELK_NB_TRANSACTION: + if (int_lock->transaction_lk_type == AFR_TRANSACTION_LK) + strcpy (lock_call_type_str, "AFR_INODELK_NB_TRANSACTION"); + else + strcpy (lock_call_type_str, "AFR_INODELK_NB_SELFHEAL"); + break; + case AFR_ENTRYLK_TRANSACTION: + if (int_lock->transaction_lk_type == AFR_TRANSACTION_LK) + strcpy (lock_call_type_str, "AFR_ENTRYLK_TRANSACTION"); + else + strcpy (lock_call_type_str, "AFR_ENTRYLK_SELFHEAL"); + break; + case AFR_ENTRYLK_NB_TRANSACTION: + if (int_lock->transaction_lk_type == AFR_TRANSACTION_LK) + strcpy (lock_call_type_str, "AFR_ENTRYLK_NB_TRANSACTION"); + else + strcpy (lock_call_type_str, "AFR_ENTRYLK_NB_SELFHEAL"); + break; + default: + strcpy (lock_call_type_str, "UNKNOWN"); + break; + } + +} + +static void +afr_trace_inodelk_out (call_frame_t *frame, afr_lock_call_type_t lock_call_type, + afr_lock_op_type_t lk_op_type, struct flock *flock, + int op_ret, int op_errno, int32_t child_index) +{ + xlator_t *this = NULL; + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + char lockee[256]; + char lock_call_type_str[256]; + char verdict[16]; + + this = THIS; + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + if (!priv->inodelk_trace) { + return; + } + + afr_print_lockee (lockee, 256, &local->loc, local->fd, child_index); + + afr_set_lock_call_type (lock_call_type, lock_call_type_str, int_lock); + + afr_print_verdict (op_ret, op_errno, verdict); + + gf_log (this->name, GF_LOG_NORMAL, + "[%s %s] [%s] Lockee={%s} Number={%llu}", + lock_call_type_str, + lk_op_type == AFR_LOCK_OP ? "LOCK REPLY" : "UNLOCK REPLY", + verdict, + lockee, + (unsigned long long) int_lock->lock_number); + +} + +static void +afr_trace_inodelk_in (call_frame_t *frame, afr_lock_call_type_t lock_call_type, + afr_lock_op_type_t lk_op_type, struct flock *flock, + int32_t cmd, int32_t child_index) +{ + xlator_t *this = NULL; + afr_local_t *local = NULL; + afr_internal_lock_t *int_lock = NULL; + afr_private_t *priv = NULL; + + char lock[256]; + char lockee[256]; + char lock_call_type_str[256]; + + this = THIS; + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + if (!priv->inodelk_trace) { + return; + } + + afr_print_inodelk (lock, 256, cmd, flock, frame->root->lk_owner); + afr_print_lockee (lockee, 256, &local->loc, local->fd, child_index); + + afr_set_lock_call_type (lock_call_type, lock_call_type_str, int_lock); + + gf_log (this->name, GF_LOG_NORMAL, + "[%s %s] Lock={%s} Lockee={%s} Number={%llu}", + lock_call_type_str, + lk_op_type == AFR_LOCK_OP ? "LOCK REQUEST" : "UNLOCK REQUEST", + lock, lockee, + (unsigned long long) int_lock->lock_number); + +} + +static void +afr_trace_entrylk_in (call_frame_t *frame, afr_lock_call_type_t lock_call_type, + afr_lock_op_type_t lk_op_type, const char *basename, + int32_t child_index) +{ + xlator_t *this = NULL; + afr_local_t *local = NULL; + afr_internal_lock_t *int_lock = NULL; + afr_private_t *priv = NULL; + + char lock[256]; + char lockee[256]; + char lock_call_type_str[256]; + + this = THIS; + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + if (!priv->entrylk_trace) { + return; + } + + afr_print_entrylk (lock, 256, basename, frame->root->lk_owner); + afr_print_lockee (lockee, 256, &local->loc, local->fd, child_index); + + afr_set_lock_call_type (lock_call_type, lock_call_type_str, int_lock); + + gf_log (this->name, GF_LOG_NORMAL, + "[%s %s] Lock={%s} Lockee={%s} Number={%llu}", + lock_call_type_str, + lk_op_type == AFR_LOCK_OP ? "LOCK REQUEST" : "UNLOCK REQUEST", + lock, lockee, + (unsigned long long) int_lock->lock_number); +} + +static void +afr_trace_entrylk_out (call_frame_t *frame, afr_lock_call_type_t lock_call_type, + afr_lock_op_type_t lk_op_type, const char *basename, int op_ret, + int op_errno, int32_t child_index) +{ + xlator_t *this = NULL; + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + char lock[256]; + char lockee[256]; + char lock_call_type_str[256]; + char verdict[16]; + + this = THIS; + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + if (!priv->entrylk_trace) { + return; + } + + afr_print_lockee (lockee, 256, &local->loc, local->fd, child_index); + + afr_set_lock_call_type (lock_call_type, lock_call_type_str, int_lock); + + afr_print_verdict (op_ret, op_errno, verdict); + + gf_log (this->name, GF_LOG_NORMAL, + "[%s %s] [%s] Lock={%s} Lockee={%s} Number={%llu}", + lock_call_type_str, + lk_op_type == AFR_LOCK_OP ? "LOCK REPLY" : "UNLOCK REPLY", + verdict, + lock, lockee, + (unsigned long long) int_lock->lock_number); + +} + +static int +transaction_lk_op (afr_local_t *local) +{ + afr_internal_lock_t *int_lock = NULL; + int ret = -1; + + int_lock = &local->internal_lock; + + if (int_lock->transaction_lk_type == AFR_TRANSACTION_LK) { + gf_log (THIS->name, GF_LOG_DEBUG, + "lk op is for a transaction"); + ret = 1; + } + else if (int_lock->transaction_lk_type == AFR_SELFHEAL_LK) { + gf_log (THIS->name, GF_LOG_DEBUG, + "lk op is for a self heal"); + + ret = 0; + } + + if (ret == -1) + gf_log (THIS->name, GF_LOG_DEBUG, + "lk op is not set"); + + return ret; + +} + +static int +is_afr_lock_transaction (afr_local_t *local) +{ + int ret = 0; + + switch (local->transaction.type) { + case AFR_DATA_TRANSACTION: + case AFR_METADATA_TRANSACTION: + case AFR_FLUSH_TRANSACTION: + ret = 1; + break; + + case AFR_ENTRY_RENAME_TRANSACTION: + case AFR_ENTRY_TRANSACTION: + ret = 0; + break; + + } + + return ret; +} + +static int +initialize_entrylk_variables (call_frame_t *frame, xlator_t *this) +{ + afr_local_t *local = NULL; + afr_internal_lock_t *int_lock = NULL; + afr_private_t *priv = NULL; + + int i = 0; + + priv = this->private; + local = frame->local; + int_lock = &local->internal_lock; + + int_lock->entrylk_lock_count = 0; + int_lock->lock_op_ret = -1; + int_lock->lock_op_errno = 0; + + for (i = 0; i < priv->child_count; i++) { + int_lock->entry_locked_nodes[i] = 0; + } + + return 0; +} + +static int +initialize_inodelk_variables (call_frame_t *frame, xlator_t *this) +{ + afr_local_t *local = NULL; + afr_internal_lock_t *int_lock = NULL; + afr_private_t *priv = NULL; + + int i = 0; + + priv = this->private; + local = frame->local; + int_lock = &local->internal_lock; + + int_lock->inodelk_lock_count = 0; + int_lock->lock_op_ret = -1; + int_lock->lock_op_errno = 0; + + for (i = 0; i < priv->child_count; i++) { + int_lock->inode_locked_nodes[i] = 0; + } + + return 0; +} + +loc_t * +lower_path (loc_t *l1, const char *b1, loc_t *l2, const char *b2) +{ + int ret = 0; + + ret = strcmp (l1->path, l2->path); + + if (ret == 0) + ret = strcmp (b1, b2); + + if (ret <= 0) + return l1; + else + return l2; +} + +int +afr_locked_nodes_count (unsigned char *locked_nodes, int child_count) + +{ + int i; + int call_count = 0; + + for (i = 0; i < child_count; i++) { + if (locked_nodes[i] & LOCKED_YES) + call_count++; + } + + return call_count; +} + +/* FIXME: What if UNLOCK fails */ +static int32_t +afr_unlock_common_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_local_t *local = NULL; + afr_internal_lock_t *int_lock = NULL; + int call_count = 0; + + local = frame->local; + int_lock = &local->internal_lock; + + LOCK (&frame->lock); + { + call_count = --int_lock->lk_call_count; + } + UNLOCK (&frame->lock); + + if (call_count == 0) { + gf_log (this->name, GF_LOG_TRACE, + "All internal locks unlocked"); + int_lock->lock_cbk (frame, this); + } + + return 0; +} + +static int32_t +afr_unlock_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_trace_inodelk_out (frame, AFR_INODELK_TRANSACTION, + AFR_UNLOCK_OP, NULL, op_ret, + op_errno, (long) cookie); + + if (op_ret < 0 && op_errno != ENOTCONN && op_errno != EBADFD) { + gf_log (this->name, GF_LOG_TRACE, + "Unlock failed for some reason"); + } + + afr_unlock_common_cbk (frame, cookie, this, op_ret, op_errno); + + return 0; + +} + +static int +afr_unlock_inodelk (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + struct flock flock; + int call_count = 0; + int i = 0; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + flock.l_start = int_lock->lk_flock.l_start; + flock.l_len = int_lock->lk_flock.l_len; + flock.l_type = F_UNLCK; + + call_count = afr_locked_nodes_count (int_lock->inode_locked_nodes, + priv->child_count); + + int_lock->lk_call_count = call_count; + + if (!call_count) { + gf_log (this->name, GF_LOG_TRACE, + "No internal locks unlocked"); + int_lock->lock_cbk (frame, this); + goto out; + } + + for (i = 0; i < priv->child_count; i++) { + if (int_lock->inode_locked_nodes[i] & LOCKED_YES) { + if (local->fd) { + afr_trace_inodelk_in (frame, AFR_INODELK_TRANSACTION, + AFR_UNLOCK_OP, &flock, F_SETLK, i); + + STACK_WIND_COOKIE (frame, afr_unlock_inodelk_cbk, + (void *) (long)i, + priv->children[i], + priv->children[i]->fops->finodelk, + this->name, local->fd, + F_SETLK, &flock); + } else { + afr_trace_inodelk_in (frame, AFR_INODELK_TRANSACTION, + AFR_UNLOCK_OP, &flock, F_SETLK, i); + + STACK_WIND_COOKIE (frame, afr_unlock_inodelk_cbk, + (void *) (long)i, + priv->children[i], + priv->children[i]->fops->inodelk, + this->name, &local->loc, + F_SETLK, &flock); + } + + } + } + +out: + return 0; +} + +static int32_t +afr_unlock_entrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_trace_entrylk_out (frame, AFR_ENTRYLK_TRANSACTION, + AFR_UNLOCK_OP, NULL, op_ret, + op_errno, (long) cookie); + + afr_unlock_common_cbk (frame, cookie, this, op_ret, op_errno); + + return 0; +} + +static int +afr_unlock_entrylk (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + const char *basename = NULL; + loc_t *loc = NULL; + + int call_count = 0; + int i = -1; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + basename = int_lock->lk_basename; + if (int_lock->lk_loc) + loc = int_lock->lk_loc; + + call_count = afr_locked_nodes_count (int_lock->entry_locked_nodes, + priv->child_count); + int_lock->lk_call_count = call_count; + + if (!call_count){ + gf_log (this->name, GF_LOG_TRACE, + "No internal locks unlocked"); + int_lock->lock_cbk (frame, this); + goto out; + } + + for (i = 0; i < priv->child_count; i++) { + if (int_lock->entry_locked_nodes[i] & LOCKED_YES) { + afr_trace_entrylk_in (frame, AFR_ENTRYLK_NB_TRANSACTION, + AFR_UNLOCK_OP, basename, i); + + STACK_WIND_COOKIE (frame, afr_unlock_entrylk_cbk, + (void *) (long) i, + priv->children[i], + priv->children[i]->fops->entrylk, + this->name, + loc, basename, + ENTRYLK_UNLOCK, ENTRYLK_WRLCK); + } + } + +out: + return 0; + +} + +static int32_t +afr_lock_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + int done = 0; + int child_index = (long) cookie; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + LOCK (&frame->lock); + { + if (op_ret == -1) { + if (op_errno == ENOSYS) { + /* return ENOTSUP */ + gf_log (this->name, GF_LOG_ERROR, + "subvolume does not support locking. " + "please load features/posix-locks xlator on server"); + local->op_ret = op_ret; + int_lock->lock_op_ret = op_ret; + done = 1; + } + + local->child_up[child_index] = 0; + local->op_errno = op_errno; + int_lock->lock_op_errno = op_errno; + } + } + UNLOCK (&frame->lock); + + if ((op_ret == -1) && + (op_errno == ENOSYS)) { + afr_unlock (frame, this); + } else { + if (op_ret == 0) { + int_lock->locked_nodes[child_index] + |= LOCKED_YES; + int_lock->lock_count++; + } + afr_lock_blocking (frame, this, child_index + 1); + } + + return 0; +} + +static int32_t +afr_blocking_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_trace_inodelk_out (frame, AFR_INODELK_TRANSACTION, + AFR_LOCK_OP, NULL, op_ret, + op_errno, (long) cookie); + + afr_lock_cbk (frame, cookie, this, op_ret, op_errno); + return 0; + +} + +static int32_t +afr_lock_lower_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_internal_lock_t *int_lock = NULL; + afr_private_t *priv = NULL; + afr_local_t *local = NULL; + loc_t *lower = NULL; + loc_t *higher = NULL; + const char *lower_name = NULL; + const char *higher_name = NULL; + + int child_index = (long) cookie; + + priv = this->private; + local = frame->local; + int_lock = &local->internal_lock; + + LOCK (&frame->lock); + { + if (op_ret == -1) { + if (op_errno == ENOSYS) { + /* return ENOTSUP */ + + gf_log (this->name, GF_LOG_ERROR, + "subvolume does not support locking. " + "please load features/posix-locks xlator on server"); + + local->op_ret = op_ret; + } + + local->child_up[child_index] = 0; + local->op_errno = op_errno; + } + } + UNLOCK (&frame->lock); + + if (op_ret != 0) { + afr_unlock (frame, this); + goto out; + } else { + int_lock->lower_locked_nodes[child_index] |= LOCKED_LOWER; + int_lock->lock_count++; + } + + /* The lower path has been locked. Now lock the higher path */ + + lower = lower_path (&local->transaction.parent_loc, + local->transaction.basename, + &local->transaction.new_parent_loc, + local->transaction.new_basename); + + lower_name = (lower == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + higher = (lower == &local->transaction.parent_loc ? + &local->transaction.new_parent_loc : + &local->transaction.parent_loc); + + higher_name = (higher == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + afr_trace_entrylk_in (frame, AFR_ENTRYLK_TRANSACTION, + AFR_LOCK_OP, higher_name, child_index); + + + STACK_WIND_COOKIE (frame, afr_lock_cbk, + (void *) (long) child_index, + priv->children[child_index], + priv->children[child_index]->fops->entrylk, + this->name, higher, higher_name, + ENTRYLK_LOCK, ENTRYLK_WRLCK); + +out: + return 0; +} + +static int32_t +afr_blocking_entrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_trace_entrylk_out (frame, AFR_ENTRYLK_TRANSACTION, + AFR_LOCK_OP, NULL, op_ret, + op_errno, (long)cookie); + + afr_lock_cbk (frame, cookie, this, op_ret, op_errno); + return 0; +} + +static int +afr_copy_locked_nodes (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + priv = this->private; + local = frame->local; + int_lock = &local->internal_lock; + + switch (local->transaction.type) { + case AFR_DATA_TRANSACTION: + case AFR_METADATA_TRANSACTION: + case AFR_FLUSH_TRANSACTION: + memcpy (int_lock->inode_locked_nodes, + int_lock->locked_nodes, + priv->child_count); + int_lock->inodelk_lock_count = int_lock->lock_count; + break; + + case AFR_ENTRY_RENAME_TRANSACTION: + case AFR_ENTRY_TRANSACTION: + memcpy (int_lock->entry_locked_nodes, + int_lock->locked_nodes, + priv->child_count); + int_lock->entrylk_lock_count = int_lock->lock_count; + break; + } + + return 0; + +} + +int +afr_lock_blocking (call_frame_t *frame, xlator_t *this, int child_index) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + afr_fd_ctx_t *fd_ctx = NULL; + loc_t *lower = NULL; + loc_t *higher = NULL; + const char *lower_name = NULL; + const char *higher_name = NULL; + + struct flock flock; + uint64_t ctx; + int ret = 0; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + flock.l_start = int_lock->lk_flock.l_start; + flock.l_len = int_lock->lk_flock.l_len; + flock.l_type = int_lock->lk_flock.l_type; + + if (local->fd) { + ret = fd_ctx_get (local->fd, this, &ctx); + + if (ret < 0) { + gf_log (this->name, GF_LOG_DEBUG, + "unable to get fd ctx for fd=%p", + local->fd); + + local->op_ret = -1; + int_lock->lock_op_ret = -1; + local->op_errno = EINVAL; + int_lock->lock_op_errno = EINVAL; + + afr_copy_locked_nodes (frame, this); + + afr_unlock (frame, this); + + return 0; + } + + fd_ctx = (afr_fd_ctx_t *)(long) ctx; + + /* skip over children that or down + or don't have the fd open */ + + while ((child_index < priv->child_count) + && (!local->child_up[child_index] + || !fd_ctx->opened_on[child_index])) + + child_index++; + } else { + /* skip over children that are down */ + while ((child_index < priv->child_count) + && !local->child_up[child_index]) + child_index++; + } + + if ((child_index == priv->child_count) && + int_lock->lock_count == 0) { + + gf_log (this->name, GF_LOG_DEBUG, + "unable to lock on even one child"); + + local->op_ret = -1; + int_lock->lock_op_ret = -1; + local->op_errno = EAGAIN; + int_lock->lock_op_errno = EAGAIN; + + afr_copy_locked_nodes (frame, this); + + afr_unlock(frame, this); + + return 0; + + } + + if ((child_index == priv->child_count) + || (int_lock->lock_count == + afr_up_children_count (priv->child_count, + local->child_up))) { + + /* we're done locking */ + + gf_log (this->name, GF_LOG_DEBUG, + "we're done locking"); + + afr_copy_locked_nodes (frame, this); + + int_lock->lock_op_ret = 0; + int_lock->lock_cbk (frame, this); + return 0; + } + + switch (local->transaction.type) { + case AFR_DATA_TRANSACTION: + case AFR_METADATA_TRANSACTION: + case AFR_FLUSH_TRANSACTION: + + if (local->fd) { + afr_trace_inodelk_in (frame, AFR_INODELK_TRANSACTION, + AFR_LOCK_OP, &flock, F_SETLKW, + child_index); + + STACK_WIND_COOKIE (frame, afr_blocking_inodelk_cbk, + (void *) (long) child_index, + priv->children[child_index], + priv->children[child_index]->fops->finodelk, + this->name, local->fd, + F_SETLKW, &flock); + + } else { + afr_trace_inodelk_in (frame, AFR_INODELK_TRANSACTION, + AFR_LOCK_OP, &flock, F_SETLKW, + child_index); + + STACK_WIND_COOKIE (frame, afr_blocking_inodelk_cbk, + (void *) (long) child_index, + priv->children[child_index], + priv->children[child_index]->fops->inodelk, + this->name, &local->loc, + F_SETLKW, &flock); + } + + break; + + case AFR_ENTRY_RENAME_TRANSACTION: + { + lower = lower_path (&local->transaction.parent_loc, + local->transaction.basename, + &local->transaction.new_parent_loc, + local->transaction.new_basename); + + lower_name = (lower == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + higher = (lower == &local->transaction.parent_loc ? + &local->transaction.new_parent_loc : + &local->transaction.parent_loc); + + higher_name = (higher == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + afr_trace_entrylk_in (frame, AFR_ENTRYLK_TRANSACTION, + AFR_LOCK_OP, lower_name, child_index); + + + STACK_WIND_COOKIE (frame, afr_lock_lower_cbk, + (void *) (long) child_index, + priv->children[child_index], + priv->children[child_index]->fops->entrylk, + this->name, lower, lower_name, + ENTRYLK_LOCK, ENTRYLK_WRLCK); + + break; + } + + case AFR_ENTRY_TRANSACTION: + if (local->fd) { + afr_trace_entrylk_in (frame, AFR_ENTRYLK_TRANSACTION, + AFR_LOCK_OP, local->transaction.basename, + child_index); + + STACK_WIND_COOKIE (frame, afr_blocking_entrylk_cbk, + (void *) (long) child_index, + priv->children[child_index], + priv->children[child_index]->fops->fentrylk, + this->name, local->fd, + local->transaction.basename, + ENTRYLK_LOCK, ENTRYLK_WRLCK); + } else { + afr_trace_entrylk_in (frame, AFR_ENTRYLK_TRANSACTION, + AFR_LOCK_OP, local->transaction.basename, + child_index); + + STACK_WIND_COOKIE (frame, afr_blocking_entrylk_cbk, + (void *) (long) child_index, + priv->children[child_index], + priv->children[child_index]->fops->entrylk, + this->name, + &local->transaction.parent_loc, + local->transaction.basename, + ENTRYLK_LOCK, ENTRYLK_WRLCK); + } + + break; + } + + return 0; + + +} + +int32_t +afr_blocking_lock (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + priv = this->private; + local = frame->local; + int_lock = &local->internal_lock; + + switch (local->transaction.type) { + case AFR_DATA_TRANSACTION: + case AFR_METADATA_TRANSACTION: + case AFR_FLUSH_TRANSACTION: + initialize_inodelk_variables (frame, this); + break; + + case AFR_ENTRY_RENAME_TRANSACTION: + case AFR_ENTRY_TRANSACTION: + initialize_entrylk_variables (frame, this); + break; + } + + afr_lock_blocking (frame, this, 0); + + return 0; +} + +static int32_t +afr_nonblocking_entrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + int call_count = 0; + int child_index = (long) cookie; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + afr_trace_entrylk_out (frame, AFR_ENTRYLK_TRANSACTION, + AFR_LOCK_OP, NULL, op_ret, + op_errno, (long) cookie); + + LOCK (&frame->lock); + { + call_count = --int_lock->lk_call_count; + } + UNLOCK (&frame->lock); + + if (op_ret < 0 ) { + if (op_errno == ENOSYS) { + /* return ENOTSUP */ + gf_log (this->name, GF_LOG_ERROR, + "subvolume does not support locking. " + "please load features/posix-locks xlator on server"); + local->op_ret = op_ret; + int_lock->lock_op_ret = op_ret; + + local->child_up[child_index] = 0; + int_lock->lock_op_errno = op_errno; + local->op_errno = op_errno; + } + } else if (op_ret == 0) { + int_lock->entry_locked_nodes[child_index] + |= LOCKED_YES; + int_lock->entrylk_lock_count++; + } + + if (call_count == 0) { + gf_log (this->name, GF_LOG_TRACE, + "Last locking reply received"); + /* all locks successfull. Proceed to call FOP */ + if (int_lock->entrylk_lock_count == + afr_up_children_count (priv->child_count, local->child_up)) { + gf_log (this->name, GF_LOG_TRACE, + "All servers locked. Calling the cbk"); + int_lock->lock_op_ret = 0; + int_lock->lock_cbk (frame, this); + } + /* Not all locks were successfull. Unlock and try locking + again, this time with serially blocking locks */ + else { + gf_log (this->name, GF_LOG_TRACE, + "%d servers locked. Trying again with blocking calls", + int_lock->lock_count); + + afr_unlock(frame, this); + } + } + + return 0; +} + +int +afr_nonblocking_entrylk (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + afr_fd_ctx_t *fd_ctx = NULL; + const char *basename = NULL; + loc_t *loc = NULL; + + int32_t call_count = 0; + int i = 0; + uint64_t ctx; + int ret = 0; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + initialize_entrylk_variables (frame, this); + + basename = int_lock->lk_basename; + if (int_lock->lk_loc) + loc = int_lock->lk_loc; + + if (local->fd) { + ret = fd_ctx_get (local->fd, this, &ctx); + + if (ret < 0) { + gf_log (this->name, GF_LOG_DEBUG, + "unable to get fd ctx for fd=%p", + local->fd); + + local->op_ret = -1; + int_lock->lock_op_ret = -1; + local->op_errno = EINVAL; + int_lock->lock_op_errno = EINVAL; + + return -1; + } + + fd_ctx = (afr_fd_ctx_t *)(long) ctx; + + call_count = internal_lock_count (frame, this, fd_ctx); + int_lock->lk_call_count = call_count; + + /* Send non-blocking entrylk calls only on up children + and where the fd has been opened */ + for (i = 0; i < priv->child_count; i++) { + if (local->child_up[i] && fd_ctx->opened_on[i]) { + afr_trace_entrylk_in (frame, AFR_ENTRYLK_NB_TRANSACTION, + AFR_LOCK_OP, basename, i); + + STACK_WIND_COOKIE (frame, afr_nonblocking_entrylk_cbk, + (void *) (long) i, + priv->children[i], + priv->children[i]->fops->fentrylk, + this->name, local->fd, + basename, + ENTRYLK_LOCK_NB, ENTRYLK_WRLCK); + } + } + } else { + GF_ASSERT (loc); + + call_count = internal_lock_count (frame, this, NULL); + int_lock->lk_call_count = call_count; + + for (i = 0; i < priv->child_count; i++) { + if (local->child_up[i]) { + afr_trace_entrylk_in (frame, AFR_ENTRYLK_NB_TRANSACTION, + AFR_LOCK_OP, basename, i); + + STACK_WIND_COOKIE (frame, afr_nonblocking_entrylk_cbk, + (void *) (long) i, + priv->children[i], + priv->children[i]->fops->entrylk, + this->name, loc, basename, + ENTRYLK_LOCK, ENTRYLK_WRLCK); + } + } + } + + return 0; +} + +int32_t +afr_nonblocking_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + + int call_count = 0; + int child_index = (long) cookie; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + afr_trace_inodelk_out (frame, AFR_INODELK_NB_TRANSACTION, + AFR_LOCK_OP, NULL, op_ret, + op_errno, (long) cookie); + + LOCK (&frame->lock); + { + call_count = --int_lock->lk_call_count; + } + UNLOCK (&frame->lock); + + if (op_ret < 0 ) { + if (op_errno == ENOSYS) { + /* return ENOTSUP */ + gf_log (this->name, GF_LOG_ERROR, + "subvolume does not support locking. " + "please load features/posix-locks xlator on server"); + local->op_ret = op_ret; + int_lock->lock_op_ret = op_ret; + local->child_up[child_index] = 0; + int_lock->lock_op_errno = op_errno; + local->op_errno = op_errno; + } + } else if (op_ret == 0) { + int_lock->inode_locked_nodes[child_index] + |= LOCKED_YES; + int_lock->inodelk_lock_count++; + } + + if (call_count == 0) { + gf_log (this->name, GF_LOG_TRACE, + "Last inode locking reply received"); + /* all locks successfull. Proceed to call FOP */ + if (int_lock->inodelk_lock_count == + afr_up_children_count (priv->child_count, local->child_up)) { + gf_log (this->name, GF_LOG_TRACE, + "All servers locked. Calling the cbk"); + int_lock->lock_op_ret = 0; + int_lock->lock_cbk (frame, this); + } + /* Not all locks were successfull. Unlock and try locking + again, this time with serially blocking locks */ + else { + gf_log (this->name, GF_LOG_TRACE, + "%d servers locked. Trying again with blocking calls", + int_lock->lock_count); + + afr_unlock(frame, this); + } + } + + return 0; +} + +int +afr_nonblocking_inodelk (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + afr_fd_ctx_t *fd_ctx = NULL; + + int32_t call_count = 0; + uint64_t ctx = 0; + int i = 0; + int ret = 0; + struct flock flock; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + flock.l_start = int_lock->lk_flock.l_start; + flock.l_len = int_lock->lk_flock.l_len; + flock.l_type = int_lock->lk_flock.l_type; + + initialize_inodelk_variables (frame, this); + + if (local->fd) { + ret = fd_ctx_get (local->fd, this, &ctx); + + if (ret < 0) { + gf_log (this->name, GF_LOG_DEBUG, + "unable to get fd ctx for fd=%p", + local->fd); + + local->op_ret = -1; + int_lock->lock_op_ret = -1; + local->op_errno = EINVAL; + int_lock->lock_op_errno = EINVAL; + + ret = -1; + goto out; + } + + fd_ctx = (afr_fd_ctx_t *)(long) ctx; + + call_count = internal_lock_count (frame, this, fd_ctx); + int_lock->lk_call_count = call_count; + + /* Send non-blocking inodelk calls only on up children + and where the fd has been opened */ + for (i = 0; i < priv->child_count; i++) { + if (local->child_up[i] && fd_ctx->opened_on[i]) { + afr_trace_inodelk_in (frame, AFR_INODELK_NB_TRANSACTION, + AFR_LOCK_OP, &flock, F_SETLK, i); + + STACK_WIND_COOKIE (frame, afr_nonblocking_inodelk_cbk, + (void *) (long) i, + priv->children[i], + priv->children[i]->fops->finodelk, + this->name, local->fd, + F_SETLK, &flock); + + } + } + } else { + call_count = internal_lock_count (frame, this, NULL); + int_lock->lk_call_count = call_count; + + for (i = 0; i < priv->child_count; i++) { + if (local->child_up[i]) { + afr_trace_inodelk_in (frame, AFR_INODELK_NB_TRANSACTION, + AFR_LOCK_OP, &flock, F_SETLK, i); + + STACK_WIND_COOKIE (frame, afr_nonblocking_inodelk_cbk, + (void *) (long) i, + priv->children[i], + priv->children[i]->fops->inodelk, + this->name, &local->loc, + F_SETLK, &flock); + } + } + } + +out: + return ret; +} + +static int +__is_lower_locked (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_private_t *priv = NULL; + afr_local_t *local = NULL; + + int count = 0; + int i = 0; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + for (i = 0; i < priv->child_count; i++) { + if (int_lock->lower_locked_nodes[i] & LOCKED_LOWER) + count++; + } + + return count; + +} + +static int +__is_higher_locked (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_private_t *priv = NULL; + afr_local_t *local = NULL; + + int count = 0; + int i = 0; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + for (i = 0; i < priv->child_count; i++) { + if (int_lock->locked_nodes[i] & LOCKED_YES) + count++; + } + + return count; + +} + +static int +afr_unlock_lower_entrylk (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + afr_private_t *priv = NULL; + const char *basename = NULL; + loc_t *loc = NULL; + + int call_count = 0; + int i = -1; + + local = frame->local; + int_lock = &local->internal_lock; + priv = this->private; + + basename = int_lock->lk_basename; + if (int_lock->lk_loc) + loc = int_lock->lk_loc; + + call_count = __is_lower_locked (frame, this); + int_lock->lk_call_count = call_count; + + if (!call_count){ + gf_log (this->name, GF_LOG_TRACE, + "No internal locks unlocked"); + int_lock->lock_cbk (frame, this); + goto out; + } + + for (i = 0; i < priv->child_count; i++) { + if (int_lock->lower_locked_nodes[i] & LOCKED_LOWER) { + afr_trace_entrylk_in (frame, AFR_ENTRYLK_NB_TRANSACTION, + AFR_UNLOCK_OP, basename, i); + + STACK_WIND_COOKIE (frame, afr_unlock_entrylk_cbk, + (void *) (long) i, + priv->children[i], + priv->children[i]->fops->entrylk, + this->name, + loc, basename, + ENTRYLK_UNLOCK, ENTRYLK_WRLCK); + } + + } + +out: + return 0; + +} + + +static int +afr_post_unlock_higher_cbk (call_frame_t *frame, xlator_t *this) +{ + afr_local_t *local = NULL; + + local = frame->local; + + local->transaction.done (frame, this); + return 0; +} + +static int +afr_post_unlock_lower_cbk (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + loc_t *lower = NULL; + loc_t *higher = NULL; + const char *lower_name = NULL; + const char *higher_name = NULL; + + local = frame->local; + int_lock = &local->internal_lock; + + lower = lower_path (&local->transaction.parent_loc, + local->transaction.basename, + &local->transaction.new_parent_loc, + local->transaction.new_basename); + + lower_name = (lower == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + higher = (lower == &local->transaction.parent_loc ? + &local->transaction.new_parent_loc : + &local->transaction.parent_loc); + + higher_name = (higher == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + if (__is_higher_locked (frame, this)) { + gf_log (this->name, GF_LOG_DEBUG, + "unlocking higher"); + int_lock->lk_basename = higher_name; + int_lock->lk_loc = higher; + int_lock->lock_cbk = afr_post_unlock_higher_cbk; + + afr_unlock_entrylk (frame, this); + } else + local->transaction.done (frame, this); + + return 0; +} + +static int +afr_rename_unlock (call_frame_t *frame, xlator_t *this) +{ + afr_internal_lock_t *int_lock = NULL; + afr_local_t *local = NULL; + loc_t *lower = NULL; + loc_t *higher = NULL; + const char *lower_name = NULL; + const char *higher_name = NULL; + + local = frame->local; + int_lock = &local->internal_lock; + + lower = lower_path (&local->transaction.parent_loc, + local->transaction.basename, + &local->transaction.new_parent_loc, + local->transaction.new_basename); + + lower_name = (lower == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + higher = (lower == &local->transaction.parent_loc ? + &local->transaction.new_parent_loc : + &local->transaction.parent_loc); + + higher_name = (higher == &local->transaction.parent_loc ? + local->transaction.basename : + local->transaction.new_basename); + + + if (__is_lower_locked (frame, this)) { + gf_log (this->name, GF_LOG_DEBUG, + "unlocking lower"); + int_lock->lk_basename = lower_name; + int_lock->lk_loc = lower; + int_lock->lock_cbk = afr_post_unlock_lower_cbk; + + afr_unlock_lower_entrylk (frame, this); + } else + afr_post_unlock_lower_cbk (frame, this); + + return 0; +} + +static int +afr_rename_transaction (call_frame_t *frame, xlator_t *this) +{ + afr_local_t *local = NULL; + + local = frame->local; + + return (local->transaction.type == + AFR_ENTRY_RENAME_TRANSACTION); + +} + +int32_t +afr_unlock (call_frame_t *frame, xlator_t *this) +{ + afr_local_t *local = NULL; + + local = frame->local; + + if (transaction_lk_op (local)) { + if (is_afr_lock_transaction (local)) + afr_unlock_inodelk (frame, this); + else + if (!afr_rename_transaction (frame, this)) + afr_unlock_entrylk (frame, this); + else + afr_rename_unlock (frame, this); + } else { + if (is_afr_lock_selfheal (local)) + afr_unlock_inodelk (frame, this); + else + afr_unlock_entrylk (frame, this); + } + + return 0; +} |