From 77adf4cd648dce41f89469dd185deec6b6b53a0b Mon Sep 17 00:00:00 2001 From: Vikas Gorur Date: Wed, 18 Feb 2009 17:36:07 +0530 Subject: Added all files --- xlators/features/locks/src/posix.c | 834 +++++++++++++++++++++++++++++++++++++ 1 file changed, 834 insertions(+) create mode 100644 xlators/features/locks/src/posix.c (limited to 'xlators/features/locks/src/posix.c') diff --git a/xlators/features/locks/src/posix.c b/xlators/features/locks/src/posix.c new file mode 100644 index 00000000000..e2b336607c4 --- /dev/null +++ b/xlators/features/locks/src/posix.c @@ -0,0 +1,834 @@ +/* + Copyright (c) 2006, 2007, 2008 Z RESEARCH, Inc. + 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 + . +*/ + +#include +#include +#include +#include + +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif + +#include "glusterfs.h" +#include "compat.h" +#include "xlator.h" +#include "inode.h" +#include "logging.h" +#include "common-utils.h" + +#include "locks.h" +#include "common.h" + +#ifndef LLONG_MAX +#define LLONG_MAX LONG_LONG_MAX /* compat with old gcc */ +#endif /* LLONG_MAX */ + +/* Forward declarations */ + + +void do_blocked_rw (pl_inode_t *); +static int __rw_allowable (pl_inode_t *, posix_lock_t *, glusterfs_fop_t); + +struct _truncate_ops { + loc_t loc; + fd_t *fd; + off_t offset; + enum {TRUNCATE, FTRUNCATE} op; +}; + + +int +pl_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno, struct stat *buf) +{ + struct _truncate_ops *local = NULL; + + local = frame->local; + + if (local->op == TRUNCATE) + loc_wipe (&local->loc); + + STACK_UNWIND (frame, op_ret, op_errno, buf); + return 0; +} + + +static int +truncate_allowed (pl_inode_t *pl_inode, + transport_t *transport, pid_t client_pid, + off_t offset) +{ + posix_lock_t *l = NULL; + posix_lock_t region = {.list = {0, }, }; + int ret = 1; + + region.fl_start = offset; + region.fl_end = LLONG_MAX; + region.transport = transport; + region.client_pid = client_pid; + + pthread_mutex_lock (&pl_inode->mutex); + { + list_for_each_entry (l, &pl_inode->ext_list, list) { + if (!l->blocked + && locks_overlap (®ion, l) + && !same_owner (®ion, l)) { + ret = 0; + break; + } + } + } + pthread_mutex_unlock (&pl_inode->mutex); + + return ret; +} + + +static int +truncate_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno, struct stat *buf) +{ + posix_locks_private_t *priv = NULL; + struct _truncate_ops *local = NULL; + inode_t *inode = NULL; + pl_inode_t *pl_inode = NULL; + + + priv = this->private; + local = frame->local; + + if (op_ret != 0) { + gf_log (this->name, GF_LOG_ERROR, + "got error (errno=%d, stderror=%s) from child", + op_errno, strerror (op_errno)); + goto unwind; + } + + if (local->op == TRUNCATE) + inode = local->loc.inode; + else + inode = local->fd->inode; + + pl_inode = pl_inode_get (this, inode); + if (!pl_inode) { + gf_log (this->name, GF_LOG_ERROR, + "unable to get pl_inode from %p", inode); + op_errno = ENOMEM; + goto unwind; + } + + if (priv->mandatory + && pl_inode->mandatory + && !truncate_allowed (pl_inode, frame->root->trans, + frame->root->pid, local->offset)) { + op_errno = EAGAIN; + goto unwind; + } + + switch (local->op) { + case TRUNCATE: + STACK_WIND (frame, pl_truncate_cbk, FIRST_CHILD (this), + FIRST_CHILD (this)->fops->truncate, + &local->loc, local->offset); + break; + case FTRUNCATE: + STACK_WIND (frame, pl_truncate_cbk, FIRST_CHILD (this), + FIRST_CHILD (this)->fops->ftruncate, + local->fd, local->offset); + break; + } + + return 0; + +unwind: + if (local->op == TRUNCATE) + loc_wipe (&local->loc); + + STACK_UNWIND (frame, -1, ENOMEM, buf); + return 0; +} + + +int +pl_truncate (call_frame_t *frame, xlator_t *this, + loc_t *loc, off_t offset) +{ + struct _truncate_ops *local = NULL; + + local = CALLOC (1, sizeof (struct _truncate_ops)); + if (!local) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + goto unwind; + } + + local->op = TRUNCATE; + local->offset = offset; + loc_copy (&local->loc, loc); + + frame->local = local; + + STACK_WIND (frame, truncate_stat_cbk, FIRST_CHILD (this), + FIRST_CHILD (this)->fops->stat, loc); + + return 0; + +unwind: + STACK_UNWIND (frame, -1, ENOMEM, NULL); + + return 0; +} + + +int +pl_ftruncate (call_frame_t *frame, xlator_t *this, + fd_t *fd, off_t offset) +{ + struct _truncate_ops *local = NULL; + + local = CALLOC (1, sizeof (struct _truncate_ops)); + if (!local) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + goto unwind; + } + + local->op = FTRUNCATE; + local->offset = offset; + local->fd = fd; + + frame->local = local; + + STACK_WIND (frame, truncate_stat_cbk, FIRST_CHILD(this), + FIRST_CHILD(this)->fops->fstat, fd); + return 0; + +unwind: + STACK_UNWIND (frame, -1, ENOMEM, NULL); + + return 0; +} + + +static void +__delete_locks_of_owner (pl_inode_t *pl_inode, + transport_t *transport, pid_t pid) +{ + posix_lock_t *tmp = NULL; + posix_lock_t *l = NULL; + + /* TODO: what if it is a blocked lock with pending l->frame */ + + list_for_each_entry_safe (l, tmp, &pl_inode->ext_list, list) { + if ((l->transport == transport) + && (l->client_pid == pid)) { + __delete_lock (pl_inode, l); + __destroy_lock (l); + } + } + + list_for_each_entry_safe (l, tmp, &pl_inode->int_list, list) { + if ((l->transport == transport) + && (l->client_pid == pid)) { + __delete_lock (pl_inode, l); + __destroy_lock (l); + } + } + + return; +} + + +int +pl_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno) +{ + STACK_UNWIND (frame, op_ret, op_errno); + + return 0; +} + + +int +pl_flush (call_frame_t *frame, xlator_t *this, + fd_t *fd) +{ + posix_locks_private_t *priv = NULL; + pl_inode_t *pl_inode = NULL; + + priv = this->private; + + pl_inode = pl_inode_get (this, fd->inode); + if (!pl_inode) { + gf_log (this->name, GF_LOG_ERROR, "returning EBADFD"); + STACK_UNWIND (frame, -1, EBADFD); + return 0; + } + + pthread_mutex_lock (&pl_inode->mutex); + { + __delete_locks_of_owner (pl_inode, frame->root->trans, + frame->root->pid); + } + pthread_mutex_unlock (&pl_inode->mutex); + + grant_blocked_locks (this, pl_inode, GF_LOCK_POSIX); + grant_blocked_locks (this, pl_inode, GF_LOCK_INTERNAL); + + do_blocked_rw (pl_inode); + + STACK_WIND (frame, pl_flush_cbk, FIRST_CHILD(this), + FIRST_CHILD(this)->fops->flush, fd); + return 0; +} + + +int +pl_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno, fd_t *fd) +{ + STACK_UNWIND (frame, op_ret, op_errno, fd); + + return 0; +} + + +int +pl_open (call_frame_t *frame, xlator_t *this, + loc_t *loc, int32_t flags, fd_t *fd) +{ + /* why isn't O_TRUNC being handled ? */ + STACK_WIND (frame, pl_open_cbk, + FIRST_CHILD(this), FIRST_CHILD(this)->fops->open, + loc, flags & ~O_TRUNC, fd); + + return 0; +} + + +int +pl_create_cbk (call_frame_t *frame, void *cookie, + xlator_t *this, int32_t op_ret, int32_t op_errno, + fd_t *fd, inode_t *inode, struct stat *buf) +{ + STACK_UNWIND (frame, op_ret, op_errno, fd, inode, buf); + + return 0; +} + + +int +pl_create (call_frame_t *frame, xlator_t *this, + loc_t *loc, int32_t flags, mode_t mode, fd_t *fd) +{ + STACK_WIND (frame, pl_create_cbk, + FIRST_CHILD (this), FIRST_CHILD (this)->fops->create, + loc, flags, mode, fd); + return 0; +} + + +int +pl_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno, + struct iovec *vector, int32_t count, struct stat *stbuf) +{ + STACK_UNWIND (frame, op_ret, op_errno, vector, count, stbuf); + + return 0; +} + +int +pl_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this, + int32_t op_ret, int32_t op_errno, struct stat *stbuf) +{ + STACK_UNWIND (frame, op_ret, op_errno, stbuf); + + return 0; +} + + +void +do_blocked_rw (pl_inode_t *pl_inode) +{ + struct list_head wind_list; + pl_rw_req_t *rw = NULL; + pl_rw_req_t *tmp = NULL; + + INIT_LIST_HEAD (&wind_list); + + pthread_mutex_lock (&pl_inode->mutex); + { + list_for_each_entry_safe (rw, tmp, &pl_inode->rw_list, list) { + if (__rw_allowable (pl_inode, &rw->region, + rw->stub->fop)) { + list_del_init (&rw->list); + list_add_tail (&rw->list, &wind_list); + } + } + } + pthread_mutex_unlock (&pl_inode->mutex); + + list_for_each_entry_safe (rw, tmp, &wind_list, list) { + list_del_init (&rw->list); + call_resume (rw->stub); + free (rw); + } + + return; +} + + +static int +__rw_allowable (pl_inode_t *pl_inode, posix_lock_t *region, + glusterfs_fop_t op) +{ + posix_lock_t *l = NULL; + int ret = 1; + + list_for_each_entry (l, &pl_inode->ext_list, list) { + if (locks_overlap (l, region) && !same_owner (l, region)) { + if ((op == GF_FOP_READ) && (l->fl_type != F_WRLCK)) + continue; + ret = 0; + break; + } + } + + return ret; +} + + +int +pl_readv_cont (call_frame_t *frame, xlator_t *this, + fd_t *fd, size_t size, off_t offset) +{ + STACK_WIND (frame, pl_readv_cbk, + FIRST_CHILD (this), FIRST_CHILD (this)->fops->readv, + fd, size, offset); + + return 0; +} + + +int +pl_readv (call_frame_t *frame, xlator_t *this, + fd_t *fd, size_t size, off_t offset) +{ + posix_locks_private_t *priv = NULL; + pl_inode_t *pl_inode = NULL; + pl_rw_req_t *rw = NULL; + posix_lock_t region = {.list = {0, }, }; + int op_ret = 0; + int op_errno = 0; + char allowable = 0; + + + priv = this->private; + + pl_inode = pl_inode_get (this, fd->inode); + + if (priv->mandatory && pl_inode->mandatory) { + region.fl_start = offset; + region.fl_end = offset + size - 1; + region.transport = frame->root->trans; + region.client_pid = frame->root->pid; + + pthread_mutex_lock (&pl_inode->mutex); + { + allowable = __rw_allowable (pl_inode, ®ion, + GF_FOP_READ); + if (allowable) + goto unlock; + + if (fd->flags & O_NONBLOCK) { + gf_log (this->name, GF_LOG_DEBUG, + "returning EWOULDBLOCK"); + op_errno = EWOULDBLOCK; + op_ret = -1; + goto unlock; + } + + rw = CALLOC (1, sizeof (*rw)); + if (!rw) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + op_errno = ENOMEM; + op_ret = -1; + goto unlock; + } + + rw->stub = fop_readv_stub (frame, pl_readv_cont, + fd, size, offset); + if (!rw->stub) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + op_errno = ENOMEM; + op_ret = -1; + free (rw); + goto unlock; + } + + rw->region = region; + + list_add_tail (&rw->list, &pl_inode->rw_list); + } + unlock: + pthread_mutex_unlock (&pl_inode->mutex); + + goto unwind; + } + + + STACK_WIND (frame, pl_readv_cbk, + FIRST_CHILD (this), FIRST_CHILD (this)->fops->readv, + fd, size, offset); + return 0; + +unwind: + if (op_ret == -1) + STACK_UNWIND (frame, -1, op_errno, NULL, 0, NULL); + + return 0; +} + + +int +pl_writev_cont (call_frame_t *frame, xlator_t *this, fd_t *fd, + struct iovec *vector, int count, off_t offset) +{ + STACK_WIND (frame, pl_writev_cbk, + FIRST_CHILD (this), FIRST_CHILD (this)->fops->writev, + fd, vector, count, offset); + + return 0; +} + + +int +pl_writev (call_frame_t *frame, xlator_t *this, fd_t *fd, + struct iovec *vector, int32_t count, off_t offset) +{ + posix_locks_private_t *priv = NULL; + pl_inode_t *pl_inode = NULL; + pl_rw_req_t *rw = NULL; + posix_lock_t region = {.list = {0, }, }; + int op_ret = 0; + int op_errno = 0; + char allowable = 0; + + + priv = this->private; + + pl_inode = pl_inode_get (this, fd->inode); + if (priv->mandatory && pl_inode->mandatory) { + region.fl_start = offset; + region.fl_end = offset + iov_length (vector, count) - 1; + region.transport = frame->root->trans; + region.client_pid = frame->root->pid; + + pthread_mutex_lock (&pl_inode->mutex); + { + allowable = __rw_allowable (pl_inode, ®ion, + GF_FOP_WRITE); + if (allowable) + goto unlock; + + if (fd->flags & O_NONBLOCK) { + gf_log (this->name, GF_LOG_DEBUG, + "returning EWOULDBLOCK"); + op_errno = EWOULDBLOCK; + op_ret = -1; + goto unlock; + } + + rw = CALLOC (1, sizeof (*rw)); + if (!rw) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + op_errno = ENOMEM; + op_ret = -1; + goto unlock; + } + + rw->stub = fop_writev_stub (frame, pl_writev_cont, + fd, vector, count, offset); + if (!rw->stub) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + op_errno = ENOMEM; + op_ret = -1; + free (rw); + goto unlock; + } + + rw->region = region; + + list_add_tail (&rw->list, &pl_inode->rw_list); + } + unlock: + pthread_mutex_unlock (&pl_inode->mutex); + + goto unwind; + } + + + STACK_WIND (frame, pl_writev_cbk, + FIRST_CHILD (this), FIRST_CHILD (this)->fops->writev, + fd, vector, count, offset); + return 0; + +unwind: + if (op_ret == -1) + STACK_UNWIND (frame, -1, op_errno, NULL, 0, NULL); + + return 0; +} + + +int +pl_lk (call_frame_t *frame, xlator_t *this, + fd_t *fd, int32_t cmd, struct flock *flock) +{ + transport_t *transport = NULL; + pid_t client_pid = 0; + posix_locks_private_t *priv = NULL; + pl_inode_t *pl_inode = NULL; + int op_ret = 0; + int op_errno = 0; + int can_block = 0; + posix_lock_t *reqlock = NULL; + posix_lock_t *conf = NULL; + int ret = 0; + + transport = frame->root->trans; + client_pid = frame->root->pid; + priv = this->private; + + pl_inode = pl_inode_get (this, fd->inode); + if (!pl_inode) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + op_ret = -1; + op_errno = ENOMEM; + goto unwind; + } + + reqlock = new_posix_lock (flock, transport, client_pid); + if (!reqlock) { + gf_log (this->name, GF_LOG_ERROR, + "out of memory :("); + op_ret = -1; + op_errno = ENOMEM; + goto unwind; + } + + switch (cmd) { + +#if F_GETLK != F_GETLK64 + case F_GETLK64: +#endif + case F_GETLK: + conf = pl_getlk (pl_inode, reqlock, GF_LOCK_POSIX); + posix_lock_to_flock (conf, flock); + __destroy_lock (reqlock); + + break; + +#if F_SETLKW != F_SETLKW64 + case F_SETLKW64: +#endif + case F_SETLKW: + can_block = 1; + reqlock->frame = frame; + reqlock->this = this; + reqlock->fd = fd; + + /* fall through */ + +#if F_SETLK != F_SETLK64 + case F_SETLK64: +#endif + case F_SETLK: + memcpy (&reqlock->user_flock, flock, sizeof (struct flock)); + ret = pl_setlk (this, pl_inode, reqlock, + can_block, GF_LOCK_POSIX); + + if (ret == -1) { + if (can_block) + goto out; + + gf_log (this->name, GF_LOG_DEBUG, "returning EAGAIN"); + op_ret = -1; + op_errno = EAGAIN; + __destroy_lock (reqlock); + } + } + +unwind: + STACK_UNWIND (frame, op_ret, op_errno, flock); +out: + return 0; +} + + +/* TODO: this function just logs, no action required?? */ +int +pl_forget (xlator_t *this, + inode_t *inode) +{ + pl_inode_t *pl_inode = NULL; + + pl_inode = pl_inode_get (this, inode); + + if (!list_empty (&pl_inode->rw_list)) { + gf_log (this->name, GF_LOG_CRITICAL, + "pending R/W requests found!"); + } + + if (!list_empty (&pl_inode->ext_list)) { + gf_log (this->name, GF_LOG_CRITICAL, + "Pending fcntl locks found!"); + } + + if (!list_empty (&pl_inode->int_list)) { + gf_log (this->name, GF_LOG_CRITICAL, + "Pending internal locks found!"); + } + + if (!list_empty (&pl_inode->dir_list)) { + gf_log (this->name, GF_LOG_CRITICAL, + "Pending entry locks found!"); + } + + FREE (pl_inode); + + return 0; +} + + +int +init (xlator_t *this) +{ + posix_locks_private_t *priv = NULL; + xlator_list_t *trav = NULL; + data_t *mandatory = NULL; + + if (!this->children || this->children->next) { + gf_log (this->name, GF_LOG_ERROR, + "FATAL: posix-locks should have exactly one child"); + return -1; + } + + if (!this->parents) { + gf_log (this->name, GF_LOG_WARNING, + "dangling volume. check volfile "); + } + + trav = this->children; + while (trav->xlator->children) + trav = trav->xlator->children; + + if (strncmp ("storage/", trav->xlator->type, 8)) { + gf_log (this->name, GF_LOG_ERROR, + "'posix-locks' not loaded over storage translator"); + return -1; + } + + priv = CALLOC (1, sizeof (*priv)); + + mandatory = dict_get (this->options, "mandatory-locks"); + if (mandatory) { + if (gf_string2boolean (mandatory->data, + &priv->mandatory) == -1) { + gf_log (this->name, GF_LOG_ERROR, + "'mandatory-locks' takes only boolean " + "options"); + return -1; + } + } + + this->private = priv; + return 0; +} + + +int +fini (xlator_t *this) +{ + posix_locks_private_t *priv = NULL; + + priv = this->private; + free (priv); + + return 0; +} + + +int +pl_inodelk (call_frame_t *frame, xlator_t *this, + loc_t *loc, int32_t cmd, struct flock *flock); + +int +pl_finodelk (call_frame_t *frame, xlator_t *this, + fd_t *fd, int32_t cmd, struct flock *flock); + +int +pl_entrylk (call_frame_t *frame, xlator_t *this, + loc_t *loc, const char *basename, + entrylk_cmd cmd, entrylk_type type); + +int +pl_fentrylk (call_frame_t *frame, xlator_t *this, + fd_t *fd, const char *basename, + entrylk_cmd cmd, entrylk_type type); + +struct xlator_fops fops = { + .create = pl_create, + .truncate = pl_truncate, + .ftruncate = pl_ftruncate, + .open = pl_open, + .readv = pl_readv, + .writev = pl_writev, + .lk = pl_lk, + .inodelk = pl_inodelk, + .finodelk = pl_finodelk, + .entrylk = pl_entrylk, + .fentrylk = pl_fentrylk, + .flush = pl_flush, +}; + + +struct xlator_mops mops = { +}; + + +struct xlator_cbks cbks = { + .forget = pl_forget, +}; + + +struct volume_options options[] = { + { .key = { "mandatory-locks", "mandatory" }, + .type = GF_OPTION_TYPE_BOOL + }, + { .key = {NULL} }, +}; -- cgit