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-rw-r--r--source3/modules/vfs_aio_fork.c936
1 files changed, 936 insertions, 0 deletions
diff --git a/source3/modules/vfs_aio_fork.c b/source3/modules/vfs_aio_fork.c
new file mode 100644
index 0000000..87dcbdd
--- /dev/null
+++ b/source3/modules/vfs_aio_fork.c
@@ -0,0 +1,936 @@
+/*
+ * Simulate the Posix AIO using mmap/fork
+ *
+ * Copyright (C) Volker Lendecke 2008
+ * Copyright (C) Jeremy Allison 2010
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "system/shmem.h"
+#include "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "lib/async_req/async_sock.h"
+#include "lib/util/tevent_unix.h"
+#include "lib/util/sys_rw.h"
+#include "lib/util/sys_rw_data.h"
+#include "lib/util/msghdr.h"
+#include "smbprofile.h"
+#include "lib/global_contexts.h"
+
+#if !defined(HAVE_STRUCT_MSGHDR_MSG_CONTROL) && !defined(HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS)
+# error Can not pass file descriptors
+#endif
+
+#undef recvmsg
+
+#ifndef MAP_FILE
+#define MAP_FILE 0
+#endif
+
+struct aio_child_list;
+
+struct aio_fork_config {
+ bool erratic_testing_mode;
+ struct aio_child_list *children;
+};
+
+struct mmap_area {
+ size_t size;
+ void *ptr;
+};
+
+static int mmap_area_destructor(struct mmap_area *area)
+{
+ munmap(discard_const(area->ptr), area->size);
+ return 0;
+}
+
+static struct mmap_area *mmap_area_init(TALLOC_CTX *mem_ctx, size_t size)
+{
+ struct mmap_area *result;
+ int fd;
+
+ result = talloc(mem_ctx, struct mmap_area);
+ if (result == NULL) {
+ DEBUG(0, ("talloc failed\n"));
+ goto fail;
+ }
+
+ fd = open("/dev/zero", O_RDWR);
+ if (fd == -1) {
+ DEBUG(3, ("open(\"/dev/zero\") failed: %s\n",
+ strerror(errno)));
+ goto fail;
+ }
+
+ result->ptr = mmap(NULL, size, PROT_READ|PROT_WRITE,
+ MAP_SHARED|MAP_FILE, fd, 0);
+ close(fd);
+ if (result->ptr == MAP_FAILED) {
+ DEBUG(1, ("mmap failed: %s\n", strerror(errno)));
+ goto fail;
+ }
+
+ result->size = size;
+ talloc_set_destructor(result, mmap_area_destructor);
+
+ return result;
+
+fail:
+ TALLOC_FREE(result);
+ return NULL;
+}
+
+enum cmd_type {
+ READ_CMD,
+ WRITE_CMD,
+ FSYNC_CMD
+};
+
+static const char *cmd_type_str(enum cmd_type cmd)
+{
+ const char *result;
+
+ switch (cmd) {
+ case READ_CMD:
+ result = "READ";
+ break;
+ case WRITE_CMD:
+ result = "WRITE";
+ break;
+ case FSYNC_CMD:
+ result = "FSYNC";
+ break;
+ default:
+ result = "<UNKNOWN>";
+ break;
+ }
+ return result;
+}
+
+struct rw_cmd {
+ size_t n;
+ off_t offset;
+ enum cmd_type cmd;
+ bool erratic_testing_mode;
+};
+
+struct rw_ret {
+ ssize_t size;
+ int ret_errno;
+ uint64_t duration;
+};
+
+struct aio_child_list;
+
+struct aio_child {
+ struct aio_child *prev, *next;
+ struct aio_child_list *list;
+ pid_t pid;
+ int sockfd;
+ struct mmap_area *map;
+ bool dont_delete; /* Marked as in use since last cleanup */
+ bool busy;
+};
+
+struct aio_child_list {
+ struct aio_child *children;
+ struct tevent_timer *cleanup_event;
+};
+
+static ssize_t read_fd(int fd, void *ptr, size_t nbytes, int *recvfd)
+{
+ struct iovec iov[1];
+ struct msghdr msg = { .msg_iov = iov, .msg_iovlen = 1 };
+ ssize_t n;
+ size_t bufsize = msghdr_prep_recv_fds(NULL, NULL, 0, 1);
+ uint8_t buf[bufsize];
+
+ msghdr_prep_recv_fds(&msg, buf, bufsize, 1);
+
+ iov[0].iov_base = (void *)ptr;
+ iov[0].iov_len = nbytes;
+
+ do {
+ n = recvmsg(fd, &msg, 0);
+ } while ((n == -1) && (errno == EINTR));
+
+ if (n <= 0) {
+ return n;
+ }
+
+ {
+ size_t num_fds = msghdr_extract_fds(&msg, NULL, 0);
+ int fds[num_fds];
+
+ msghdr_extract_fds(&msg, fds, num_fds);
+
+ if (num_fds != 1) {
+ size_t i;
+
+ for (i=0; i<num_fds; i++) {
+ close(fds[i]);
+ }
+
+ *recvfd = -1;
+ return n;
+ }
+
+ *recvfd = fds[0];
+ }
+
+ return(n);
+}
+
+static ssize_t write_fd(int fd, void *ptr, size_t nbytes, int sendfd)
+{
+ struct msghdr msg = {0};
+ size_t bufsize = msghdr_prep_fds(NULL, NULL, 0, &sendfd, 1);
+ uint8_t buf[bufsize];
+ struct iovec iov;
+ ssize_t sent;
+
+ msghdr_prep_fds(&msg, buf, bufsize, &sendfd, 1);
+
+ iov.iov_base = (void *)ptr;
+ iov.iov_len = nbytes;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+
+ do {
+ sent = sendmsg(fd, &msg, 0);
+ } while ((sent == -1) && (errno == EINTR));
+
+ return sent;
+}
+
+static void aio_child_cleanup(struct tevent_context *event_ctx,
+ struct tevent_timer *te,
+ struct timeval now,
+ void *private_data)
+{
+ struct aio_child_list *list = talloc_get_type_abort(
+ private_data, struct aio_child_list);
+ struct aio_child *child, *next;
+
+ TALLOC_FREE(list->cleanup_event);
+
+ for (child = list->children; child != NULL; child = next) {
+ next = child->next;
+
+ if (child->busy) {
+ DEBUG(10, ("child %d currently active\n",
+ (int)child->pid));
+ continue;
+ }
+
+ if (child->dont_delete) {
+ DEBUG(10, ("Child %d was active since last cleanup\n",
+ (int)child->pid));
+ child->dont_delete = false;
+ continue;
+ }
+
+ DEBUG(10, ("Child %d idle for more than 30 seconds, "
+ "deleting\n", (int)child->pid));
+
+ TALLOC_FREE(child);
+ child = next;
+ }
+
+ if (list->children != NULL) {
+ /*
+ * Re-schedule the next cleanup round
+ */
+ list->cleanup_event = tevent_add_timer(global_event_context(), list,
+ timeval_add(&now, 30, 0),
+ aio_child_cleanup, list);
+
+ }
+}
+
+static struct aio_child_list *init_aio_children(struct vfs_handle_struct *handle)
+{
+ struct aio_fork_config *config;
+ struct aio_child_list *children;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config, struct aio_fork_config,
+ return NULL);
+
+ if (config->children == NULL) {
+ config->children = talloc_zero(config, struct aio_child_list);
+ if (config->children == NULL) {
+ return NULL;
+ }
+ }
+ children = config->children;
+
+ /*
+ * Regardless of whether the child_list had been around or not, make
+ * sure that we have a cleanup timed event. This timed event will
+ * delete itself when it finds that no children are around anymore.
+ */
+
+ if (children->cleanup_event == NULL) {
+ children->cleanup_event =
+ tevent_add_timer(global_event_context(), children,
+ timeval_current_ofs(30, 0),
+ aio_child_cleanup, children);
+ if (children->cleanup_event == NULL) {
+ TALLOC_FREE(config->children);
+ return NULL;
+ }
+ }
+
+ return children;
+}
+
+static void aio_child_loop(int sockfd, struct mmap_area *map)
+{
+ while (true) {
+ int fd = -1;
+ ssize_t ret;
+ struct rw_cmd cmd_struct;
+ struct rw_ret ret_struct;
+ struct timespec start, end;
+
+ ret = read_fd(sockfd, &cmd_struct, sizeof(cmd_struct), &fd);
+ if (ret != sizeof(cmd_struct)) {
+ DEBUG(10, ("read_fd returned %d: %s\n", (int)ret,
+ strerror(errno)));
+ exit(1);
+ }
+
+ DEBUG(10, ("aio_child_loop: %s %d bytes at %d from fd %d\n",
+ cmd_type_str(cmd_struct.cmd),
+ (int)cmd_struct.n, (int)cmd_struct.offset, fd));
+
+ if (cmd_struct.erratic_testing_mode) {
+ /*
+ * For developer testing, we want erratic behaviour for
+ * async I/O times
+ */
+ uint8_t randval;
+ unsigned msecs;
+ /*
+ * use generate_random_buffer, we just forked from a
+ * common parent state
+ */
+ generate_random_buffer(&randval, sizeof(randval));
+ msecs = (randval%20)+1;
+ DEBUG(10, ("delaying for %u msecs\n", msecs));
+ smb_msleep(msecs);
+ }
+
+ ZERO_STRUCT(ret_struct);
+
+ PROFILE_TIMESTAMP(&start);
+
+ switch (cmd_struct.cmd) {
+ case READ_CMD:
+ ret_struct.size = sys_pread_full(
+ fd, discard_const(map->ptr), cmd_struct.n,
+ cmd_struct.offset);
+#if 0
+/* This breaks "make test" when run with aio_fork module. */
+#ifdef DEVELOPER
+ ret_struct.size = MAX(1, ret_struct.size * 0.9);
+#endif
+#endif
+ break;
+ case WRITE_CMD:
+ ret_struct.size = sys_pwrite_full(
+ fd, discard_const(map->ptr), cmd_struct.n,
+ cmd_struct.offset);
+ break;
+ case FSYNC_CMD:
+ ret_struct.size = fsync(fd);
+ break;
+ default:
+ ret_struct.size = -1;
+ errno = EINVAL;
+ }
+
+ PROFILE_TIMESTAMP(&end);
+ ret_struct.duration = nsec_time_diff(&end, &start);
+ DEBUG(10, ("aio_child_loop: syscall returned %d\n",
+ (int)ret_struct.size));
+
+ if (ret_struct.size == -1) {
+ ret_struct.ret_errno = errno;
+ }
+
+ /*
+ * Close the fd before telling our parent we're done. The
+ * parent might close and re-open the file very quickly, and
+ * with system-level share modes (GPFS) we would get an
+ * unjustified SHARING_VIOLATION.
+ */
+ close(fd);
+
+ ret = write_data(sockfd, (char *)&ret_struct,
+ sizeof(ret_struct));
+ if (ret != sizeof(ret_struct)) {
+ DEBUG(10, ("could not write ret_struct: %s\n",
+ strerror(errno)));
+ exit(2);
+ }
+ }
+}
+
+static int aio_child_destructor(struct aio_child *child)
+{
+ char c=0;
+
+ SMB_ASSERT(!child->busy);
+
+ DEBUG(10, ("aio_child_destructor: removing child %d on fd %d\n",
+ (int)child->pid, child->sockfd));
+
+ /*
+ * closing the sockfd makes the child not return from recvmsg() on RHEL
+ * 5.5 so instead force the child to exit by writing bad data to it
+ */
+ sys_write_v(child->sockfd, &c, sizeof(c));
+ close(child->sockfd);
+ DLIST_REMOVE(child->list->children, child);
+ return 0;
+}
+
+/*
+ * We have to close all fd's in open files, we might incorrectly hold a system
+ * level share mode on a file.
+ */
+
+static struct files_struct *close_fsp_fd(struct files_struct *fsp,
+ void *private_data)
+{
+ if ((fsp->fh != NULL) && (fsp_get_pathref_fd(fsp) != -1)) {
+ close(fsp_get_pathref_fd(fsp));
+ fsp_set_fd(fsp, -1);
+ }
+ return NULL;
+}
+
+static int create_aio_child(struct smbd_server_connection *sconn,
+ struct aio_child_list *children,
+ size_t map_size,
+ struct aio_child **presult)
+{
+ struct aio_child *result;
+ int fdpair[2];
+ int ret;
+
+ fdpair[0] = fdpair[1] = -1;
+
+ result = talloc_zero(children, struct aio_child);
+ if (result == NULL) {
+ return ENOMEM;
+ }
+
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) == -1) {
+ ret = errno;
+ DEBUG(10, ("socketpair() failed: %s\n", strerror(errno)));
+ goto fail;
+ }
+
+ DEBUG(10, ("fdpair = %d/%d\n", fdpair[0], fdpair[1]));
+
+ result->map = mmap_area_init(result, map_size);
+ if (result->map == NULL) {
+ ret = errno;
+ DEBUG(0, ("Could not create mmap area\n"));
+ goto fail;
+ }
+
+ result->pid = fork();
+ if (result->pid == -1) {
+ ret = errno;
+ DEBUG(0, ("fork failed: %s\n", strerror(errno)));
+ goto fail;
+ }
+
+ if (result->pid == 0) {
+ close(fdpair[0]);
+ result->sockfd = fdpair[1];
+ files_forall(sconn, close_fsp_fd, NULL);
+ aio_child_loop(result->sockfd, result->map);
+ }
+
+ DEBUG(10, ("Child %d created with sockfd %d\n",
+ (int)result->pid, fdpair[0]));
+
+ result->sockfd = fdpair[0];
+ close(fdpair[1]);
+
+ result->list = children;
+ DLIST_ADD(children->children, result);
+
+ talloc_set_destructor(result, aio_child_destructor);
+
+ *presult = result;
+
+ return 0;
+
+ fail:
+ if (fdpair[0] != -1) close(fdpair[0]);
+ if (fdpair[1] != -1) close(fdpair[1]);
+ TALLOC_FREE(result);
+
+ return ret;
+}
+
+static int get_idle_child(struct vfs_handle_struct *handle,
+ struct aio_child **pchild)
+{
+ struct aio_child_list *children;
+ struct aio_child *child;
+
+ children = init_aio_children(handle);
+ if (children == NULL) {
+ return ENOMEM;
+ }
+
+ for (child = children->children; child != NULL; child = child->next) {
+ if (!child->busy) {
+ break;
+ }
+ }
+
+ if (child == NULL) {
+ int ret;
+
+ DEBUG(10, ("no idle child found, creating new one\n"));
+
+ ret = create_aio_child(handle->conn->sconn, children,
+ 128*1024, &child);
+ if (ret != 0) {
+ DEBUG(10, ("create_aio_child failed: %s\n",
+ strerror(errno)));
+ return ret;
+ }
+ }
+
+ child->dont_delete = true;
+ child->busy = true;
+
+ *pchild = child;
+ return 0;
+}
+
+struct aio_fork_pread_state {
+ struct aio_child *child;
+ size_t n;
+ void *data;
+ ssize_t ret;
+ struct vfs_aio_state vfs_aio_state;
+};
+
+static void aio_fork_pread_done(struct tevent_req *subreq);
+
+static struct tevent_req *aio_fork_pread_send(struct vfs_handle_struct *handle,
+ TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct files_struct *fsp,
+ void *data,
+ size_t n, off_t offset)
+{
+ struct tevent_req *req, *subreq;
+ struct aio_fork_pread_state *state;
+ struct rw_cmd cmd;
+ ssize_t written;
+ int err;
+ struct aio_fork_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config,
+ struct aio_fork_config,
+ return NULL);
+
+ req = tevent_req_create(mem_ctx, &state, struct aio_fork_pread_state);
+ if (req == NULL) {
+ return NULL;
+ }
+ state->n = n;
+ state->data = data;
+
+ if (n > 128*1024) {
+ /* TODO: support variable buffers */
+ tevent_req_error(req, EINVAL);
+ return tevent_req_post(req, ev);
+ }
+
+ err = get_idle_child(handle, &state->child);
+ if (err != 0) {
+ tevent_req_error(req, err);
+ return tevent_req_post(req, ev);
+ }
+
+ ZERO_STRUCT(cmd);
+ cmd.n = n;
+ cmd.offset = offset;
+ cmd.cmd = READ_CMD;
+ cmd.erratic_testing_mode = config->erratic_testing_mode;
+
+ DEBUG(10, ("sending fd %d to child %d\n", fsp_get_io_fd(fsp),
+ (int)state->child->pid));
+
+ /*
+ * Not making this async. We're writing into an empty unix
+ * domain socket. This should never block.
+ */
+ written = write_fd(state->child->sockfd, &cmd, sizeof(cmd),
+ fsp_get_io_fd(fsp));
+ if (written == -1) {
+ err = errno;
+
+ TALLOC_FREE(state->child);
+
+ DEBUG(10, ("write_fd failed: %s\n", strerror(err)));
+ tevent_req_error(req, err);
+ return tevent_req_post(req, ev);
+ }
+
+ subreq = read_packet_send(state, ev, state->child->sockfd,
+ sizeof(struct rw_ret), NULL, NULL);
+ if (tevent_req_nomem(subreq, req)) {
+ TALLOC_FREE(state->child); /* we sent sth down */
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, aio_fork_pread_done, req);
+ return req;
+}
+
+static void aio_fork_pread_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct aio_fork_pread_state *state = tevent_req_data(
+ req, struct aio_fork_pread_state);
+ ssize_t nread;
+ uint8_t *buf;
+ int err;
+ struct rw_ret *retbuf;
+
+ nread = read_packet_recv(subreq, talloc_tos(), &buf, &err);
+ TALLOC_FREE(subreq);
+ if (nread == -1) {
+ TALLOC_FREE(state->child);
+ tevent_req_error(req, err);
+ return;
+ }
+
+ retbuf = (struct rw_ret *)buf;
+ state->ret = retbuf->size;
+ state->vfs_aio_state.error = retbuf->ret_errno;
+ state->vfs_aio_state.duration = retbuf->duration;
+
+ if ((size_t)state->ret > state->n) {
+ tevent_req_error(req, EIO);
+ state->child->busy = false;
+ return;
+ }
+ memcpy(state->data, state->child->map->ptr, state->ret);
+
+ state->child->busy = false;
+
+ tevent_req_done(req);
+}
+
+static ssize_t aio_fork_pread_recv(struct tevent_req *req,
+ struct vfs_aio_state *vfs_aio_state)
+{
+ struct aio_fork_pread_state *state = tevent_req_data(
+ req, struct aio_fork_pread_state);
+
+ if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
+ return -1;
+ }
+ *vfs_aio_state = state->vfs_aio_state;
+ return state->ret;
+}
+
+struct aio_fork_pwrite_state {
+ struct aio_child *child;
+ ssize_t ret;
+ struct vfs_aio_state vfs_aio_state;
+};
+
+static void aio_fork_pwrite_done(struct tevent_req *subreq);
+
+static struct tevent_req *aio_fork_pwrite_send(
+ struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev, struct files_struct *fsp,
+ const void *data, size_t n, off_t offset)
+{
+ struct tevent_req *req, *subreq;
+ struct aio_fork_pwrite_state *state;
+ struct rw_cmd cmd;
+ ssize_t written;
+ int err;
+ struct aio_fork_config *config;
+ SMB_VFS_HANDLE_GET_DATA(handle, config,
+ struct aio_fork_config,
+ return NULL);
+
+ req = tevent_req_create(mem_ctx, &state, struct aio_fork_pwrite_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ if (n > 128*1024) {
+ /* TODO: support variable buffers */
+ tevent_req_error(req, EINVAL);
+ return tevent_req_post(req, ev);
+ }
+
+ err = get_idle_child(handle, &state->child);
+ if (err != 0) {
+ tevent_req_error(req, err);
+ return tevent_req_post(req, ev);
+ }
+
+ memcpy(state->child->map->ptr, data, n);
+
+ ZERO_STRUCT(cmd);
+ cmd.n = n;
+ cmd.offset = offset;
+ cmd.cmd = WRITE_CMD;
+ cmd.erratic_testing_mode = config->erratic_testing_mode;
+
+ DEBUG(10, ("sending fd %d to child %d\n", fsp_get_io_fd(fsp),
+ (int)state->child->pid));
+
+ /*
+ * Not making this async. We're writing into an empty unix
+ * domain socket. This should never block.
+ */
+ written = write_fd(state->child->sockfd, &cmd, sizeof(cmd),
+ fsp_get_io_fd(fsp));
+ if (written == -1) {
+ err = errno;
+
+ TALLOC_FREE(state->child);
+
+ DEBUG(10, ("write_fd failed: %s\n", strerror(err)));
+ tevent_req_error(req, err);
+ return tevent_req_post(req, ev);
+ }
+
+ subreq = read_packet_send(state, ev, state->child->sockfd,
+ sizeof(struct rw_ret), NULL, NULL);
+ if (tevent_req_nomem(subreq, req)) {
+ TALLOC_FREE(state->child); /* we sent sth down */
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, aio_fork_pwrite_done, req);
+ return req;
+}
+
+static void aio_fork_pwrite_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct aio_fork_pwrite_state *state = tevent_req_data(
+ req, struct aio_fork_pwrite_state);
+ ssize_t nread;
+ uint8_t *buf;
+ int err;
+ struct rw_ret *retbuf;
+
+ nread = read_packet_recv(subreq, talloc_tos(), &buf, &err);
+ TALLOC_FREE(subreq);
+ if (nread == -1) {
+ TALLOC_FREE(state->child);
+ tevent_req_error(req, err);
+ return;
+ }
+
+ state->child->busy = false;
+
+ retbuf = (struct rw_ret *)buf;
+ state->ret = retbuf->size;
+ state->vfs_aio_state.error = retbuf->ret_errno;
+ state->vfs_aio_state.duration = retbuf->duration;
+ tevent_req_done(req);
+}
+
+static ssize_t aio_fork_pwrite_recv(struct tevent_req *req,
+ struct vfs_aio_state *vfs_aio_state)
+{
+ struct aio_fork_pwrite_state *state = tevent_req_data(
+ req, struct aio_fork_pwrite_state);
+
+ if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
+ return -1;
+ }
+ *vfs_aio_state = state->vfs_aio_state;
+ return state->ret;
+}
+
+struct aio_fork_fsync_state {
+ struct aio_child *child;
+ ssize_t ret;
+ struct vfs_aio_state vfs_aio_state;
+};
+
+static void aio_fork_fsync_done(struct tevent_req *subreq);
+
+static struct tevent_req *aio_fork_fsync_send(
+ struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev, struct files_struct *fsp)
+{
+ struct tevent_req *req, *subreq;
+ struct aio_fork_fsync_state *state;
+ struct rw_cmd cmd;
+ ssize_t written;
+ int err;
+ struct aio_fork_config *config;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, config,
+ struct aio_fork_config,
+ return NULL);
+
+ req = tevent_req_create(mem_ctx, &state, struct aio_fork_fsync_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ err = get_idle_child(handle, &state->child);
+ if (err != 0) {
+ tevent_req_error(req, err);
+ return tevent_req_post(req, ev);
+ }
+
+ ZERO_STRUCT(cmd);
+ cmd.cmd = FSYNC_CMD;
+ cmd.erratic_testing_mode = config->erratic_testing_mode;
+
+ DEBUG(10, ("sending fd %d to child %d\n", fsp_get_io_fd(fsp),
+ (int)state->child->pid));
+
+ /*
+ * Not making this async. We're writing into an empty unix
+ * domain socket. This should never block.
+ */
+ written = write_fd(state->child->sockfd, &cmd, sizeof(cmd),
+ fsp_get_io_fd(fsp));
+ if (written == -1) {
+ err = errno;
+
+ TALLOC_FREE(state->child);
+
+ DEBUG(10, ("write_fd failed: %s\n", strerror(err)));
+ tevent_req_error(req, err);
+ return tevent_req_post(req, ev);
+ }
+
+ subreq = read_packet_send(state, ev, state->child->sockfd,
+ sizeof(struct rw_ret), NULL, NULL);
+ if (tevent_req_nomem(subreq, req)) {
+ TALLOC_FREE(state->child); /* we sent sth down */
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, aio_fork_fsync_done, req);
+ return req;
+}
+
+static void aio_fork_fsync_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct aio_fork_fsync_state *state = tevent_req_data(
+ req, struct aio_fork_fsync_state);
+ ssize_t nread;
+ uint8_t *buf;
+ int err;
+ struct rw_ret *retbuf;
+
+ nread = read_packet_recv(subreq, talloc_tos(), &buf, &err);
+ TALLOC_FREE(subreq);
+ if (nread == -1) {
+ TALLOC_FREE(state->child);
+ tevent_req_error(req, err);
+ return;
+ }
+
+ state->child->busy = false;
+
+ retbuf = (struct rw_ret *)buf;
+ state->ret = retbuf->size;
+ state->vfs_aio_state.error = retbuf->ret_errno;
+ state->vfs_aio_state.duration = retbuf->duration;
+ tevent_req_done(req);
+}
+
+static int aio_fork_fsync_recv(struct tevent_req *req,
+ struct vfs_aio_state *vfs_aio_state)
+{
+ struct aio_fork_fsync_state *state = tevent_req_data(
+ req, struct aio_fork_fsync_state);
+
+ if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
+ return -1;
+ }
+ *vfs_aio_state = state->vfs_aio_state;
+ return state->ret;
+}
+
+static int aio_fork_connect(vfs_handle_struct *handle, const char *service,
+ const char *user)
+{
+ int ret;
+ struct aio_fork_config *config;
+ ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
+
+ if (ret < 0) {
+ return ret;
+ }
+
+ config = talloc_zero(handle->conn, struct aio_fork_config);
+ if (!config) {
+ SMB_VFS_NEXT_DISCONNECT(handle);
+ DEBUG(0, ("talloc_zero() failed\n"));
+ return -1;
+ }
+
+ config->erratic_testing_mode = lp_parm_bool(SNUM(handle->conn), "vfs_aio_fork",
+ "erratic_testing_mode", false);
+
+ SMB_VFS_HANDLE_SET_DATA(handle, config,
+ NULL, struct aio_fork_config,
+ return -1);
+
+ return 0;
+}
+
+static struct vfs_fn_pointers vfs_aio_fork_fns = {
+ .connect_fn = aio_fork_connect,
+ .pread_send_fn = aio_fork_pread_send,
+ .pread_recv_fn = aio_fork_pread_recv,
+ .pwrite_send_fn = aio_fork_pwrite_send,
+ .pwrite_recv_fn = aio_fork_pwrite_recv,
+ .fsync_send_fn = aio_fork_fsync_send,
+ .fsync_recv_fn = aio_fork_fsync_recv,
+};
+
+static_decl_vfs;
+NTSTATUS vfs_aio_fork_init(TALLOC_CTX *ctx)
+{
+ return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
+ "aio_fork", &vfs_aio_fork_fns);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 10:42:12 +0000