diff options
Diffstat (limited to 'xlators/experimental/nsr-server/src/nsr.c')
| -rw-r--r-- | xlators/experimental/nsr-server/src/nsr.c | 1147 |
1 files changed, 0 insertions, 1147 deletions
diff --git a/xlators/experimental/nsr-server/src/nsr.c b/xlators/experimental/nsr-server/src/nsr.c deleted file mode 100644 index 0fb618f236e..00000000000 --- a/xlators/experimental/nsr-server/src/nsr.c +++ /dev/null @@ -1,1147 +0,0 @@ -/* - Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com> - 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. -*/ - -#ifndef _CONFIG_H -#define _CONFIG_H -#include "config.h" -#endif - -#include <fnmatch.h> -#include "call-stub.h" -#include "defaults.h" -#include "xlator.h" -#include "glfs.h" -#include "glfs-internal.h" -#include "run.h" -#include "common-utils.h" -#include "syncop.h" -#include "syscall.h" -#include "compat-errno.h" - -#include "nsr-internal.h" -#include "nsr-messages.h" - -#define NSR_FLUSH_INTERVAL 5 - -enum { - /* echo "cluster/nsr-server" | md5sum | cut -c 1-8 */ - NSR_SERVER_IPC_BASE = 0x0e2d66a5, - NSR_SERVER_TERM_RANGE, - NSR_SERVER_OPEN_TERM, - NSR_SERVER_NEXT_ENTRY -}; - -/* Used to check the quorum of acks received after the fop - * confirming the status of the fop on all the brick processes - * for this particular subvolume - */ -gf_boolean_t -fop_quorum_check (xlator_t *this, double n_children, - double current_state) -{ - nsr_private_t *priv = NULL; - gf_boolean_t result = _gf_false; - double required = 0; - double current = 0; - - GF_VALIDATE_OR_GOTO ("nsr", this, out); - priv = this->private; - GF_VALIDATE_OR_GOTO (this->name, priv, out); - - required = n_children * priv->quorum_pct; - - /* - * Before performing the fop on the leader, we need to check, - * if there is any merit in performing the fop on the leader. - * In a case, where even a successful write on the leader, will - * not meet quorum, there is no point in trying the fop on the - * leader. - * When this function is called after the leader has tried - * performing the fop, this check will calculate quorum taking into - * account the status of the fop on the leader. If the leader's - * op_ret was -1, the complete function would account that by - * decrementing successful_acks by 1 - */ - - current = current_state * 100.0; - - if (current < required) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_QUORUM_NOT_MET, - "Quorum not met. quorum_pct = %f " - "Current State = %f, Required State = %f", - priv->quorum_pct, current, - required); - } else - result = _gf_true; - -out: - return result; -} - -nsr_inode_ctx_t * -nsr_get_inode_ctx (xlator_t *this, inode_t *inode) -{ - uint64_t ctx_int = 0LL; - nsr_inode_ctx_t *ctx_ptr; - - if (__inode_ctx_get(inode, this, &ctx_int) == 0) { - ctx_ptr = (nsr_inode_ctx_t *)(long)ctx_int; - } else { - ctx_ptr = GF_CALLOC (1, sizeof(*ctx_ptr), - gf_mt_nsr_inode_ctx_t); - if (ctx_ptr) { - ctx_int = (uint64_t)(long)ctx_ptr; - if (__inode_ctx_set(inode, this, &ctx_int) == 0) { - LOCK_INIT(&ctx_ptr->lock); - INIT_LIST_HEAD(&ctx_ptr->aqueue); - INIT_LIST_HEAD(&ctx_ptr->pqueue); - } else { - GF_FREE(ctx_ptr); - ctx_ptr = NULL; - } - } - - } - - return ctx_ptr; -} - -nsr_fd_ctx_t * -nsr_get_fd_ctx (xlator_t *this, fd_t *fd) -{ - uint64_t ctx_int = 0LL; - nsr_fd_ctx_t *ctx_ptr; - - if (__fd_ctx_get(fd, this, &ctx_int) == 0) { - ctx_ptr = (nsr_fd_ctx_t *)(long)ctx_int; - } else { - ctx_ptr = GF_CALLOC (1, sizeof(*ctx_ptr), gf_mt_nsr_fd_ctx_t); - if (ctx_ptr) { - if (__fd_ctx_set(fd, this, (uint64_t)ctx_ptr) == 0) { - INIT_LIST_HEAD(&ctx_ptr->dirty_list); - INIT_LIST_HEAD(&ctx_ptr->fd_list); - } else { - GF_FREE(ctx_ptr); - ctx_ptr = NULL; - } - } - - } - - return ctx_ptr; -} - -void -nsr_mark_fd_dirty (xlator_t *this, nsr_local_t *local) -{ - fd_t *fd = local->fd; - nsr_fd_ctx_t *ctx_ptr; - nsr_dirty_list_t *dirty; - nsr_private_t *priv = this->private; - - /* - * TBD: don't do any of this for O_SYNC/O_DIRECT writes. - * Unfortunately, that optimization requires that we distinguish - * between writev and other "write" calls, saving the original flags - * and checking them in the callback. Too much work for too little - * gain right now. - */ - - LOCK(&fd->lock); - ctx_ptr = nsr_get_fd_ctx(this, fd); - dirty = GF_CALLOC(1, sizeof(*dirty), gf_mt_nsr_dirty_t); - if (ctx_ptr && dirty) { - gf_msg_trace (this->name, 0, - "marking fd %p as dirty (%p)", fd, dirty); - /* TBD: fill dirty->id from what changelog gave us */ - list_add_tail(&dirty->links, &ctx_ptr->dirty_list); - if (list_empty(&ctx_ptr->fd_list)) { - /* Add a ref so _release doesn't get called. */ - ctx_ptr->fd = fd_ref(fd); - LOCK(&priv->dirty_lock); - list_add_tail (&ctx_ptr->fd_list, - &priv->dirty_fds); - UNLOCK(&priv->dirty_lock); - } - } else { - gf_msg (this->name, GF_LOG_ERROR, ENOMEM, - N_MSG_MEM_ERR, "could not mark %p dirty", fd); - if (ctx_ptr) { - GF_FREE(ctx_ptr); - } - if (dirty) { - GF_FREE(dirty); - } - } - UNLOCK(&fd->lock); -} - -#define NSR_TERM_XATTR "trusted.nsr.term" -#define NSR_INDEX_XATTR "trusted.nsr.index" -#define NSR_REP_COUNT_XATTR "trusted.nsr.rep-count" -#define RECON_TERM_XATTR "trusted.nsr.recon-term" -#define RECON_INDEX_XATTR "trusted.nsr.recon-index" - -#pragma generate - -uint8_t -nsr_count_up_kids (nsr_private_t *priv) -{ - uint8_t retval = 0; - uint8_t i; - - for (i = 0; i < priv->n_children; ++i) { - if (priv->kid_state & (1 << i)) { - ++retval; - } - } - - return retval; -} - -/* - * The fsync machinery looks a lot like that for any write call, but there are - * some important differences that are easy to miss. First, we don't care - * about the xdata that shows whether the call came from a leader or - * reconciliation process. If we're the leader we fan out; if we're not we - * don't. Second, we don't wait for followers before we issue the local call. - * The code generation system could be updated to handle this, and still might - * if we need to implement other "almost identical" paths (e.g. for open), but - * a copy is more readable as long as it's just one. - */ - -int32_t -nsr_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) -{ - nsr_local_t *local = frame->local; - gf_boolean_t unwind; - - LOCK(&frame->lock); - unwind = !--(local->call_count); - UNLOCK(&frame->lock); - - if (unwind) { - STACK_UNWIND_STRICT (fsync, frame, op_ret, op_errno, prebuf, - postbuf, xdata); - } - return 0; -} - -int32_t -nsr_fsync_local_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) -{ - nsr_dirty_list_t *dirty; - nsr_dirty_list_t *dtmp; - nsr_local_t *local = frame->local; - - list_for_each_entry_safe (dirty, dtmp, &local->qlinks, links) { - gf_msg_trace (this->name, 0, - "sending post-op on %p (%p)", local->fd, dirty); - GF_FREE(dirty); - } - - return nsr_fsync_cbk (frame, cookie, this, op_ret, op_errno, - prebuf, postbuf, xdata); -} - -int32_t -nsr_fsync (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t flags, - dict_t *xdata) -{ - nsr_private_t *priv = this->private; - nsr_local_t *local; - uint64_t ctx_int = 0LL; - nsr_fd_ctx_t *ctx_ptr; - xlator_list_t *trav; - - local = mem_get0(this->local_pool); - if (!local) { - STACK_UNWIND_STRICT(fsync, frame, -1, ENOMEM, - NULL, NULL, xdata); - return 0; - } - INIT_LIST_HEAD(&local->qlinks); - frame->local = local; - - /* Move the dirty list from the fd to the fsync request. */ - LOCK(&fd->lock); - if (__fd_ctx_get(fd, this, &ctx_int) == 0) { - ctx_ptr = (nsr_fd_ctx_t *)(long)ctx_int; - list_splice_init (&ctx_ptr->dirty_list, - &local->qlinks); - } - UNLOCK(&fd->lock); - - /* Issue the local call. */ - local->call_count = priv->leader ? priv->n_children : 1; - STACK_WIND (frame, nsr_fsync_local_cbk, - FIRST_CHILD(this), FIRST_CHILD(this)->fops->fsync, - fd, flags, xdata); - - /* Issue remote calls if we're the leader. */ - if (priv->leader) { - for (trav = this->children->next; trav; trav = trav->next) { - STACK_WIND (frame, nsr_fsync_cbk, - FIRST_CHILD(this), - FIRST_CHILD(this)->fops->fsync, - fd, flags, xdata); - } - } - - return 0; -} - -int32_t -nsr_getxattr_special (call_frame_t *frame, xlator_t *this, loc_t *loc, - const char *name, dict_t *xdata) -{ - dict_t *result; - nsr_private_t *priv = this->private; - - if (!priv->leader) { - STACK_UNWIND_STRICT (getxattr, frame, -1, EREMOTE, NULL, NULL); - return 0; - } - - if (!name || (strcmp(name, NSR_REP_COUNT_XATTR) != 0)) { - STACK_WIND_TAIL (frame, - FIRST_CHILD(this), - FIRST_CHILD(this)->fops->getxattr, - loc, name, xdata); - return 0; - } - - result = dict_new(); - if (!result) { - goto dn_failed; - } - - priv->up_children = nsr_count_up_kids(this->private); - if (dict_set_uint32(result, NSR_REP_COUNT_XATTR, - priv->up_children) != 0) { - goto dsu_failed; - } - - STACK_UNWIND_STRICT (getxattr, frame, 0, 0, result, NULL); - dict_destroy(result); - return 0; - -dsu_failed: - dict_destroy(result); -dn_failed: - STACK_UNWIND_STRICT (getxattr, frame, -1, ENOMEM, NULL, NULL); - return 0; -} - -void -nsr_flush_fd (xlator_t *this, nsr_fd_ctx_t *fd_ctx) -{ - nsr_dirty_list_t *dirty; - nsr_dirty_list_t *dtmp; - - list_for_each_entry_safe (dirty, dtmp, &fd_ctx->dirty_list, links) { - gf_msg_trace (this->name, 0, - "sending post-op on %p (%p)", fd_ctx->fd, dirty); - GF_FREE(dirty); - } - - INIT_LIST_HEAD(&fd_ctx->dirty_list); -} - -void * -nsr_flush_thread (void *ctx) -{ - xlator_t *this = ctx; - nsr_private_t *priv = this->private; - struct list_head dirty_fds; - nsr_fd_ctx_t *fd_ctx; - nsr_fd_ctx_t *fd_tmp; - int ret; - - for (;;) { - /* - * We have to be very careful to avoid lock inversions here, so - * we can't just hold priv->dirty_lock while we take and - * release locks for each fd. Instead, we only hold dirty_lock - * at the beginning of each iteration, as we (effectively) make - * a copy of the current list head and then clear the original. - * This leads to four scenarios for adding the first entry to - * an fd and potentially putting it on the global list. - * - * (1) While we're asleep. No lock contention, it just gets - * added and will be processed on the next iteration. - * - * (2) After we've made a local copy, but before we've started - * processing that fd. The new entry will be added to the - * fd (under its lock), and we'll process it on the current - * iteration. - * - * (3) While we're processing the fd. They'll block on the fd - * lock, then see that the list is empty and put it on the - * global list. We'll process it here on the next - * iteration. - * - * (4) While we're working, but after we've processed that fd. - * Same as (1) as far as that fd is concerned. - */ - INIT_LIST_HEAD(&dirty_fds); - LOCK(&priv->dirty_lock); - list_splice_init(&priv->dirty_fds, &dirty_fds); - UNLOCK(&priv->dirty_lock); - - list_for_each_entry_safe (fd_ctx, fd_tmp, &dirty_fds, fd_list) { - ret = syncop_fsync(FIRST_CHILD(this), fd_ctx->fd, 0, - NULL, NULL); - if (ret) { - gf_msg (this->name, GF_LOG_WARNING, 0, - N_MSG_SYS_CALL_FAILURE, - "failed to fsync %p (%d)", - fd_ctx->fd, -ret); - } - - LOCK(&fd_ctx->fd->lock); - nsr_flush_fd(this, fd_ctx); - list_del_init(&fd_ctx->fd_list); - UNLOCK(&fd_ctx->fd->lock); - fd_unref(fd_ctx->fd); - } - - sleep(NSR_FLUSH_INTERVAL); - } - - return NULL; -} - - -int32_t -nsr_get_changelog_dir (xlator_t *this, char **cl_dir_p) -{ - xlator_t *cl_xl; - - /* Find our changelog translator. */ - cl_xl = this; - while (cl_xl) { - if (strcmp(cl_xl->type, "features/changelog") == 0) { - break; - } - cl_xl = cl_xl->children->xlator; - } - if (!cl_xl) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_INIT_FAIL, - "failed to find changelog translator"); - return ENOENT; - } - - /* Find the actual changelog directory. */ - if (dict_get_str(cl_xl->options, "changelog-dir", cl_dir_p) != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_INIT_FAIL, - "failed to find changelog-dir for %s", cl_xl->name); - return ENODATA; - } - - return 0; -} - - -void -nsr_get_terms (call_frame_t *frame, xlator_t *this) -{ - int32_t op_errno; - char *cl_dir; - DIR *fp = NULL; - struct dirent *rd_entry; - struct dirent *rd_result; - int32_t term_first = -1; - int32_t term_contig = -1; - int32_t term_last = -1; - int term_num; - char *probe_str; - dict_t *my_xdata = NULL; - - op_errno = nsr_get_changelog_dir(this, &cl_dir); - if (op_errno) { - goto err; /* Error was already logged. */ - } - op_errno = ENODATA; /* Most common error after this. */ - - rd_entry = alloca (offsetof(struct dirent, d_name) + - pathconf(cl_dir, _PC_NAME_MAX) + 1); - if (!rd_entry) { - goto err; - } - - fp = sys_opendir (cl_dir); - if (!fp) { - op_errno = errno; - goto err; - } - - /* Find first and last terms. */ - for (;;) { - if (readdir_r(fp, rd_entry, &rd_result) != 0) { - op_errno = errno; - goto err; - } - if (!rd_result) { - break; - } - if (fnmatch("TERM.*", rd_entry->d_name, FNM_PATHNAME) != 0) { - continue; - } - /* +5 points to the character after the period */ - term_num = atoi(rd_entry->d_name+5); - gf_msg (this->name, GF_LOG_INFO, 0, - N_MSG_GENERIC, - "%s => %d", rd_entry->d_name, term_num); - if (term_num < 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_INVALID, - "invalid term file name %s", rd_entry->d_name); - op_errno = EINVAL; - goto err; - } - if ((term_first < 0) || (term_first > term_num)) { - term_first = term_num; - } - if ((term_last < 0) || (term_last < term_num)) { - term_last = term_num; - } - } - if ((term_first < 0) || (term_last < 0)) { - /* TBD: are we *sure* there should always be at least one? */ - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_NO_DATA, "no terms found"); - op_errno = EINVAL; - goto err; - } - - sys_closedir (fp); - fp = NULL; - - /* - * Find term_contig, which is the earliest term for which there are - * no gaps between it and term_last. - */ - for (term_contig = term_last; term_contig > 0; --term_contig) { - if (gf_asprintf(&probe_str, "%s/TERM.%d", - cl_dir, term_contig-1) <= 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_MEM_ERR, - "failed to format term %d", term_contig-1); - goto err; - } - if (sys_access(probe_str, F_OK) != 0) { - GF_FREE(probe_str); - break; - } - GF_FREE(probe_str); - } - - gf_msg (this->name, GF_LOG_INFO, 0, - N_MSG_GENERIC, - "found terms %d-%d (%d)", - term_first, term_last, term_contig); - - /* Return what we've found */ - my_xdata = dict_new(); - if (!my_xdata) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_MEM_ERR, - "failed to allocate reply dictionary"); - goto err; - } - if (dict_set_int32(my_xdata, "term-first", term_first) != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_DICT_FLR, - "failed to set term-first"); - goto err; - } - if (dict_set_int32(my_xdata, "term-contig", term_contig) != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_DICT_FLR, - "failed to set term-contig"); - goto err; - } - if (dict_set_int32(my_xdata, "term-last", term_last) != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_DICT_FLR, - "failed to set term-last"); - goto err; - } - - /* Finally! */ - STACK_UNWIND_STRICT (ipc, frame, 0, 0, my_xdata); - dict_unref(my_xdata); - return; - -err: - if (fp) { - sys_closedir (fp); - } - if (my_xdata) { - dict_unref(my_xdata); - } - STACK_UNWIND_STRICT (ipc, frame, -1, op_errno, NULL); -} - - -long -get_entry_count (xlator_t *this, int fd) -{ - struct stat buf; - long min; /* last entry not known to be empty */ - long max; /* first entry known to be empty */ - long curr; - char entry[CHANGELOG_ENTRY_SIZE]; - - if (sys_fstat (fd, &buf) < 0) { - return -1; - } - - min = 0; - max = buf.st_size / CHANGELOG_ENTRY_SIZE; - - while ((min+1) < max) { - curr = (min + max) / 2; - if (sys_lseek(fd, curr*CHANGELOG_ENTRY_SIZE, SEEK_SET) < 0) { - return -1; - } - if (sys_read(fd, entry, sizeof(entry)) != sizeof(entry)) { - return -1; - } - if ((entry[0] == '_') && (entry[1] == 'P')) { - min = curr; - } else { - max = curr; - } - } - - if (sys_lseek(fd, 0, SEEK_SET) < 0) { - gf_msg (this->name, GF_LOG_WARNING, 0, - N_MSG_SYS_CALL_FAILURE, - "failed to reset offset"); - } - return max; -} - - -void -nsr_open_term (call_frame_t *frame, xlator_t *this, dict_t *xdata) -{ - int32_t op_errno; - char *cl_dir; - char *term; - char *path; - nsr_private_t *priv = this->private; - - op_errno = nsr_get_changelog_dir(this, &cl_dir); - if (op_errno) { - goto err; - } - - if (dict_get_str(xdata, "term", &term) != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_NO_DATA, "missing term"); - op_errno = ENODATA; - goto err; - } - - if (gf_asprintf(&path, "%s/TERM.%s", cl_dir, term) < 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_MEM_ERR, "failed to construct path"); - op_errno = ENOMEM; - goto err; - } - - if (priv->term_fd >= 0) { - sys_close (priv->term_fd); - } - priv->term_fd = open(path, O_RDONLY); - if (priv->term_fd < 0) { - op_errno = errno; - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_SYS_CALL_FAILURE, - "failed to open term file"); - goto err; - } - - priv->term_total = get_entry_count(this, priv->term_fd); - if (priv->term_total < 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_NO_DATA, "failed to get entry count"); - sys_close (priv->term_fd); - priv->term_fd = -1; - op_errno = EIO; - goto err; - } - priv->term_read = 0; - - /* Success! */ - STACK_UNWIND_STRICT (ipc, frame, 0, 0, NULL); - return; - -err: - STACK_UNWIND_STRICT (ipc, frame, -1, op_errno, NULL); -} - - -void -nsr_next_entry (call_frame_t *frame, xlator_t *this) -{ - int32_t op_errno = ENOMEM; - nsr_private_t *priv = this->private; - ssize_t nbytes; - dict_t *my_xdata; - - if (priv->term_fd < 0) { - op_errno = EBADFD; - goto err; - } - - if (priv->term_read >= priv->term_total) { - op_errno = ENODATA; - goto err; - } - - nbytes = sys_read (priv->term_fd, priv->term_buf, CHANGELOG_ENTRY_SIZE); - if (nbytes < CHANGELOG_ENTRY_SIZE) { - if (nbytes < 0) { - op_errno = errno; - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_SYS_CALL_FAILURE, - "error reading next entry: %s", - strerror(errno)); - } else { - op_errno = EIO; - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_SYS_CALL_FAILURE, - "got %ld/%d bytes for next entry", - nbytes, CHANGELOG_ENTRY_SIZE); - } - goto err; - } - ++(priv->term_read); - - my_xdata = dict_new(); - if (!my_xdata) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_MEM_ERR, "failed to allocate reply xdata"); - goto err; - } - - if (dict_set_static_bin(my_xdata, "data", - priv->term_buf, CHANGELOG_ENTRY_SIZE) != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, - N_MSG_DICT_FLR, "failed to assign reply xdata"); - goto err; - } - - STACK_UNWIND_STRICT (ipc, frame, 0, 0, my_xdata); - dict_unref(my_xdata); - return; - -err: - STACK_UNWIND_STRICT (ipc, frame, -1, op_errno, NULL); -} - - -int32_t -nsr_ipc (call_frame_t *frame, xlator_t *this, int32_t op, dict_t *xdata) -{ - switch (op) { - case NSR_SERVER_TERM_RANGE: - nsr_get_terms(frame, this); - break; - case NSR_SERVER_OPEN_TERM: - nsr_open_term(frame, this, xdata); - break; - case NSR_SERVER_NEXT_ENTRY: - nsr_next_entry(frame, this); - break; - default: - STACK_WIND_TAIL (frame, - FIRST_CHILD(this), - FIRST_CHILD(this)->fops->ipc, - op, xdata); - } - - return 0; -} - - -int32_t -nsr_forget (xlator_t *this, inode_t *inode) -{ - uint64_t ctx = 0LL; - - if ((inode_ctx_del(inode, this, &ctx) == 0) && ctx) { - GF_FREE((void *)(long)ctx); - } - - return 0; -} - -int32_t -nsr_release (xlator_t *this, fd_t *fd) -{ - uint64_t ctx = 0LL; - - if ((fd_ctx_del(fd, this, &ctx) == 0) && ctx) { - GF_FREE((void *)(long)ctx); - } - - return 0; -} - -struct xlator_cbks cbks = { - .forget = nsr_forget, - .release = nsr_release, -}; - -int -nsr_reconfigure (xlator_t *this, dict_t *options) -{ - nsr_private_t *priv = this->private; - - GF_OPTION_RECONF ("leader", - priv->config_leader, options, bool, err); - GF_OPTION_RECONF ("quorum-percent", - priv->quorum_pct, options, percent, err); - gf_msg (this->name, GF_LOG_INFO, 0, N_MSG_GENERIC, - "reconfigure called, config_leader = %d, quorum_pct = %.1f\n", - priv->leader, priv->quorum_pct); - - priv->leader = priv->config_leader; - - return 0; - -err: - return -1; -} - -int -nsr_get_child_index (xlator_t *this, xlator_t *kid) -{ - xlator_list_t *trav; - int retval = -1; - - for (trav = this->children; trav; trav = trav->next) { - ++retval; - if (trav->xlator == kid) { - return retval; - } - } - - return -1; -} - -/* - * Child notify handling is unreasonably FUBAR. Sometimes we'll get a - * CHILD_DOWN for a protocol/client child before we ever got a CHILD_UP for it. - * Other times we won't. Because it's effectively random (probably racy), we - * can't just maintain a count. We actually have to keep track of the state - * for each child separately, to filter out the bogus CHILD_DOWN events, and - * then generate counts on demand. - */ -int -nsr_notify (xlator_t *this, int event, void *data, ...) -{ - nsr_private_t *priv = this->private; - int index = -1; - int ret = -1; - gf_boolean_t result = _gf_false; - gf_boolean_t relevant = _gf_false; - - switch (event) { - case GF_EVENT_CHILD_UP: - index = nsr_get_child_index(this, data); - if (index >= 0) { - /* Check if the child was previously down - * and it's not a false CHILD_UP - */ - if (!(priv->kid_state & (1 << index))) { - relevant = _gf_true; - } - - priv->kid_state |= (1 << index); - priv->up_children = nsr_count_up_kids(priv); - gf_msg (this->name, GF_LOG_INFO, 0, N_MSG_GENERIC, - "got CHILD_UP for %s, now %u kids", - ((xlator_t *)data)->name, - priv->up_children); - if (!priv->config_leader && (priv->up_children > 1)) { - priv->leader = _gf_false; - } - - /* If it's not relevant, or we have already * - * sent CHILD_UP just break */ - if (!relevant || priv->child_up) - break; - - /* If it's not a leader, just send the notify up */ - if (!priv->leader) { - ret = default_notify(this, event, data); - if (!ret) - priv->child_up = _gf_true; - break; - } - - result = fop_quorum_check (this, - (double)(priv->n_children - 1), - (double)(priv->up_children - 1)); - if (result == _gf_false) { - gf_msg (this->name, GF_LOG_INFO, 0, - N_MSG_GENERIC, "Not enough children " - "are up to meet quorum. Waiting to " - "send CHILD_UP from leader"); - } else { - gf_msg (this->name, GF_LOG_INFO, 0, - N_MSG_GENERIC, "Enough children are up " - "to meet quorum. Sending CHILD_UP " - "from leader"); - ret = default_notify(this, event, data); - if (!ret) - priv->child_up = _gf_true; - } - } - break; - case GF_EVENT_CHILD_DOWN: - index = nsr_get_child_index(this, data); - if (index >= 0) { - /* Check if the child was previously up - * and it's not a false CHILD_DOWN - */ - if (priv->kid_state & (1 << index)) { - relevant = _gf_true; - } - priv->kid_state &= ~(1 << index); - priv->up_children = nsr_count_up_kids(priv); - gf_msg (this->name, GF_LOG_INFO, 0, N_MSG_GENERIC, - "got CHILD_DOWN for %s, now %u kids", - ((xlator_t *)data)->name, - priv->up_children); - if (!priv->config_leader && (priv->up_children < 2) - && relevant) { - priv->leader = _gf_true; - } - - /* If it's not relevant, or we have already * - * sent CHILD_DOWN just break */ - if (!relevant || !priv->child_up) - break; - - /* If it's not a leader, just break coz we shouldn't * - * propagate the failure from the failure till it * - * itself goes down * - */ - if (!priv->leader) { - break; - } - - result = fop_quorum_check (this, - (double)(priv->n_children - 1), - (double)(priv->up_children - 1)); - if (result == _gf_false) { - gf_msg (this->name, GF_LOG_INFO, 0, - N_MSG_GENERIC, "Enough children are " - "to down to fail quorum. " - "Sending CHILD_DOWN from leader"); - ret = default_notify(this, event, data); - if (!ret) - priv->child_up = _gf_false; - } else { - gf_msg (this->name, GF_LOG_INFO, 0, - N_MSG_GENERIC, "Not enough children " - "are down to fail quorum. Waiting to " - "send CHILD_DOWN from leader"); - } - } - break; - default: - ret = default_notify(this, event, data); - } - - return ret; -} - - -int32_t -mem_acct_init (xlator_t *this) -{ - int ret = -1; - - GF_VALIDATE_OR_GOTO ("nsr", this, out); - - ret = xlator_mem_acct_init (this, gf_mt_nsr_end + 1); - - if (ret != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, N_MSG_MEM_ERR, - "Memory accounting init" "failed"); - return ret; - } -out: - return ret; -} - - -void -nsr_deallocate_priv (nsr_private_t *priv) -{ - if (!priv) { - return; - } - - GF_FREE(priv); -} - - -int32_t -nsr_init (xlator_t *this) -{ - xlator_list_t *remote; - xlator_list_t *local; - nsr_private_t *priv = NULL; - xlator_list_t *trav; - pthread_t kid; - extern xlator_t global_xlator; - glusterfs_ctx_t *oldctx = global_xlator.ctx; - - /* - * Any fop that gets special treatment has to be patched in here, - * because the compiled-in table is produced by the code generator and - * only contains generated functions. Note that we have to go through - * this->fops because of some dynamic-linking strangeness; modifying - * the static table doesn't work. - */ - this->fops->getxattr = nsr_getxattr_special; - this->fops->fsync = nsr_fsync; - this->fops->ipc = nsr_ipc; - - local = this->children; - if (!local) { - gf_msg (this->name, GF_LOG_ERROR, 0, N_MSG_NO_DATA, - "no local subvolume"); - goto err; - } - - remote = local->next; - if (!remote) { - gf_msg (this->name, GF_LOG_ERROR, 0, N_MSG_NO_DATA, - "no remote subvolumes"); - goto err; - } - - this->local_pool = mem_pool_new (nsr_local_t, 128); - if (!this->local_pool) { - gf_msg (this->name, GF_LOG_ERROR, 0, N_MSG_MEM_ERR, - "failed to create nsr_local_t pool"); - goto err; - } - - priv = GF_CALLOC (1, sizeof(*priv), gf_mt_nsr_private_t); - if (!priv) { - gf_msg (this->name, GF_LOG_ERROR, 0, N_MSG_MEM_ERR, - "could not allocate priv"); - goto err; - } - - for (trav = this->children; trav; trav = trav->next) { - ++(priv->n_children); - } - - LOCK_INIT(&priv->dirty_lock); - LOCK_INIT(&priv->index_lock); - INIT_LIST_HEAD(&priv->dirty_fds); - priv->term_fd = -1; - - this->private = priv; - - GF_OPTION_INIT ("leader", priv->config_leader, bool, err); - GF_OPTION_INIT ("quorum-percent", priv->quorum_pct, percent, err); - - priv->leader = priv->config_leader; - priv->child_up = _gf_false; - - if (pthread_create(&kid, NULL, nsr_flush_thread, - this) != 0) { - gf_msg (this->name, GF_LOG_ERROR, 0, N_MSG_SYS_CALL_FAILURE, - "could not start flush thread"); - /* TBD: treat this as a fatal error? */ - } - - /* - * Calling glfs_new changes old->ctx, even if THIS still points - * to global_xlator. That causes problems later in the main - * thread, when gf_log_dump_graph tries to use the FILE after - * we've mucked with it and gets a segfault in __fprintf_chk. - * We can avoid all that by undoing the damage before we - * continue. - */ - global_xlator.ctx = oldctx; - - return 0; - -err: - nsr_deallocate_priv(priv); - return -1; -} - - -void -nsr_fini (xlator_t *this) -{ - nsr_deallocate_priv(this->private); -} - -class_methods_t class_methods = { - .init = nsr_init, - .fini = nsr_fini, - .reconfigure = nsr_reconfigure, - .notify = nsr_notify, -}; - -struct volume_options options[] = { - { .key = {"leader"}, - .type = GF_OPTION_TYPE_BOOL, - .default_value = "false", - .description = "Start in the leader role. This is only for " - "bootstrapping the code, and should go away when we " - "have real leader election." - }, - { .key = {"vol-name"}, - .type = GF_OPTION_TYPE_STR, - .description = "volume name" - }, - { .key = {"my-name"}, - .type = GF_OPTION_TYPE_STR, - .description = "brick name in form of host:/path" - }, - { .key = {"etcd-servers"}, - .type = GF_OPTION_TYPE_STR, - .description = "list of comma seperated etc servers" - }, - { .key = {"subvol-uuid"}, - .type = GF_OPTION_TYPE_STR, - .description = "UUID for this NSR (sub)volume" - }, - { .key = {"quorum-percent"}, - .type = GF_OPTION_TYPE_PERCENT, - .default_value = "50.0", - .description = "percentage of rep_count-1 that must be up" - }, - { .key = {NULL} }, -}; |