#include <ftw.h>
#include <mqueue.h>
#include <utime.h>
+#include <signal.h>
#ifdef ENABLE_XATTR
#include <attr/xattr.h>
#endif
+#define MSG_VERSION_TOO_HIGH -1
+#define MSG_BREAK_LOOP -2
+
/* File descriptor to a file open on the WIM filesystem. */
struct wimlib_fd {
struct inode *f_inode;
}
}
-
/*
* Deletes the staging directory and all the files contained in it.
*/
return ret;
}
+static void inode_update_lte_ptr(struct inode *inode,
+ struct lookup_table_entry *old_lte,
+ struct lookup_table_entry *new_lte)
+{
+ if (inode->lte == old_lte) {
+ inode->lte = new_lte;
+ } else {
+ for (unsigned i = 0; i < inode->num_ads; i++) {
+ if (inode->ads_entries[i].lte == old_lte) {
+ inode->ads_entries[i].lte = new_lte;
+ break;
+ }
+ }
+ }
+}
+
+static int update_lte_of_staging_file(struct lookup_table_entry *lte,
+ struct lookup_table *table)
+{
+ struct lookup_table_entry *duplicate_lte;
+ int ret;
+ u8 hash[SHA1_HASH_SIZE];
+ struct stat stbuf;
+
+ ret = sha1sum(lte->staging_file_name, hash);
+ if (ret != 0)
+ return ret;
+ lookup_table_unlink(table, lte);
+ duplicate_lte = __lookup_resource(table, hash);
+ if (duplicate_lte) {
+ /* Merge duplicate lookup table entries */
+ duplicate_lte->refcnt += lte->refcnt;
+ inode_update_lte_ptr(lte->lte_inode, lte, duplicate_lte);
+ free_lookup_table_entry(lte);
+ } else {
+ if (stat(lte->staging_file_name, &stbuf) != 0) {
+ ERROR_WITH_ERRNO("Failed to stat `%s'", lte->staging_file_name);
+ return WIMLIB_ERR_STAT;
+ }
+ if (stbuf.st_size == 0) {
+ /* Zero-length stream. No lookup table entry needed. */
+ inode_update_lte_ptr(lte->lte_inode, lte, NULL);
+ free_lookup_table_entry(lte);
+ } else {
+ wimlib_assert(<e->file_on_disk == <e->staging_file_name);
+ lte->resource_entry.original_size = stbuf.st_size;
+ lte->resource_entry.size = stbuf.st_size;
+ lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
+ lte->file_on_disk_fp = NULL;
+ copy_hash(lte->hash, hash);
+ lookup_table_insert(table, lte);
+ }
+ }
+ return 0;
+}
+
+static int inode_close_fds(struct inode *inode)
+{
+ u16 num_opened_fds = inode->num_opened_fds;
+ for (u16 i = 0, j = 0; j < num_opened_fds; i++) {
+ struct wimlib_fd *fd = inode->fds[i];
+ if (fd) {
+ wimlib_assert(fd->f_inode == inode);
+ int ret = close_wimlib_fd(fd);
+ if (ret != 0)
+ return ret;
+ j++;
+ }
+ }
+ return 0;
+}
+
+/* Overwrites the WIM file, with changes saved. */
+static int rebuild_wim(struct wimfs_context *ctx, int write_flags)
+{
+ int ret;
+ struct lookup_table_entry *lte, *tmp;
+ WIMStruct *w = ctx->wim;
+
+ DEBUG("Closing all staging file descriptors.");
+ list_for_each_entry_safe(lte, tmp, &ctx->staging_list, staging_list) {
+ ret = inode_close_fds(lte->lte_inode);
+ if (ret != 0)
+ return ret;
+ }
+
+ DEBUG("Calculating SHA1 checksums for all new staging files.");
+ list_for_each_entry(lte, &ctx->staging_list, staging_list) {
+ ret = update_lte_of_staging_file(lte, w->lookup_table);
+ if (ret != 0)
+ return ret;
+ }
+
+ xml_update_image_info(w, w->current_image);
+ ret = wimlib_overwrite(w, write_flags, 0, NULL);
+ if (ret != 0)
+ ERROR("Failed to commit changes to mounted WIM image");
+ return ret;
+}
+
+
/* Simple function that returns the concatenation of 2 strings. */
static char *strcat_dup(const char *s1, const char *s2, size_t max_len)
* Opens two POSIX message queue: one for sending messages from the unmount
* process to the daemon process, and one to go the other way. The names of the
* message queues, which must be system-wide unique, are be based on the mount
- * point. (There of course is still a possibility of a collision if one were to
- * unmount two identically named directories simultaneously...)
+ * point.
*
* @daemon specifies whether the calling process is the filesystem daemon or the
* unmount process.
/* Closes the message queues, which are allocated in static variables */
static void close_message_queues(struct wimfs_context *ctx)
{
+ DEBUG("Closing message queues");
mq_close(ctx->unmount_to_daemon_mq);
ctx->unmount_to_daemon_mq = (mqd_t)(-1);
mq_close(ctx->daemon_to_unmount_mq);
unlink_message_queues(ctx);
}
-struct unmount_message_header {
+
+struct unmount_msg_hdr {
u32 min_version;
u32 cur_version;
- u32 data_size;
+ u32 msg_type;
+ u32 msg_size;
+} PACKED;
+
+struct msg_unmount_request {
+ struct unmount_msg_hdr hdr;
+ u32 unmount_flags;
+} PACKED;
+
+struct msg_daemon_info {
+ struct unmount_msg_hdr hdr;
+ pid_t daemon_pid;
+ u32 mount_flags;
+} PACKED;
+
+struct msg_unmount_finished {
+ struct unmount_msg_hdr hdr;
+ int32_t status;
+} PACKED;
+
+enum {
+ MSG_TYPE_UNMOUNT_REQUEST,
+ MSG_TYPE_DAEMON_INFO,
+ MSG_TYPE_UNMOUNT_FINISHED,
+ MSG_TYPE_MAX,
};
-struct unmount_request {
- struct unmount_message_header hdr;
- struct {
- u32 unmount_flags;
- } data;
+struct msg_handler_context {
+ bool is_daemon;
+ int timeout_seconds;
+ union {
+ struct {
+ pid_t daemon_pid;
+ int mount_flags;
+ int status;
+ } unmount;
+ struct {
+ struct wimfs_context *wimfs_ctx;
+ } daemon;
+ };
};
-struct unmount_response {
- struct unmount_message_header hdr;
- struct {
- int32_t status;
- u32 mount_flags;
- } data;
-};
+static int send_unmount_request_msg(mqd_t mq, int unmount_flags)
+{
+ DEBUG("Sending unmount request msg");
+ struct msg_unmount_request msg = {
+ .hdr = {
+ .min_version = WIMLIB_MAKEVERSION(1, 2, 0),
+ .cur_version = WIMLIB_VERSION_CODE,
+ .msg_type = MSG_TYPE_UNMOUNT_REQUEST,
+ .msg_size = sizeof(msg),
+ },
+ .unmount_flags = unmount_flags,
+ };
-static void inode_update_lte_ptr(struct inode *inode,
- struct lookup_table_entry *old_lte,
- struct lookup_table_entry *new_lte)
-{
- if (inode->lte == old_lte) {
- inode->lte = new_lte;
- } else {
- for (unsigned i = 0; i < inode->num_ads; i++) {
- if (inode->ads_entries[i].lte == old_lte) {
- inode->ads_entries[i].lte = new_lte;
- break;
- }
- }
+ if (mq_send(mq, (void*)&msg, sizeof(msg), 1)) {
+ ERROR_WITH_ERRNO("Failed to communicate with filesystem daemon");
+ return WIMLIB_ERR_MQUEUE;
}
+ return 0;
}
-static int update_lte_of_staging_file(struct lookup_table_entry *lte,
- struct lookup_table *table)
+static int send_daemon_info_msg(mqd_t mq, pid_t pid, int mount_flags)
{
- struct lookup_table_entry *duplicate_lte;
- int ret;
- u8 hash[SHA1_HASH_SIZE];
- struct stat stbuf;
+ DEBUG("Sending daemon info msg (pid = %d, mount_flags=%x)",
+ pid, mount_flags);
- ret = sha1sum(lte->staging_file_name, hash);
- if (ret != 0)
- return ret;
- lookup_table_unlink(table, lte);
- duplicate_lte = __lookup_resource(table, hash);
- if (duplicate_lte) {
- /* Merge duplicate lookup table entries */
- duplicate_lte->refcnt += lte->refcnt;
- inode_update_lte_ptr(lte->lte_inode, lte, duplicate_lte);
- free_lookup_table_entry(lte);
- } else {
- if (stat(lte->staging_file_name, &stbuf) != 0) {
- ERROR_WITH_ERRNO("Failed to stat `%s'", lte->staging_file_name);
- return WIMLIB_ERR_STAT;
- }
- if (stbuf.st_size == 0) {
- /* Zero-length stream. No lookup table entry needed. */
- inode_update_lte_ptr(lte->lte_inode, lte, NULL);
- free_lookup_table_entry(lte);
- } else {
- wimlib_assert(<e->file_on_disk == <e->staging_file_name);
- lte->resource_entry.original_size = stbuf.st_size;
- lte->resource_entry.size = stbuf.st_size;
- lte->resource_location = RESOURCE_IN_FILE_ON_DISK;
- lte->file_on_disk_fp = NULL;
- copy_hash(lte->hash, hash);
- lookup_table_insert(table, lte);
- }
+ struct msg_daemon_info msg = {
+ .hdr = {
+ .min_version = WIMLIB_MAKEVERSION(1, 2, 0),
+ .cur_version = WIMLIB_VERSION_CODE,
+ .msg_type = MSG_TYPE_DAEMON_INFO,
+ .msg_size = sizeof(msg),
+ },
+ .daemon_pid = pid,
+ .mount_flags = mount_flags,
+ };
+ if (mq_send(mq, (void*)&msg, sizeof(msg), 1)) {
+ ERROR_WITH_ERRNO("Failed to send daemon info to unmount process");
+ return WIMLIB_ERR_MQUEUE;
}
return 0;
}
-static int inode_close_fds(struct inode *inode)
+static void send_unmount_finished_msg(mqd_t mq, int status)
{
- u16 num_opened_fds = inode->num_opened_fds;
- for (u16 i = 0, j = 0; j < num_opened_fds; i++) {
- struct wimlib_fd *fd = inode->fds[i];
- if (fd) {
- wimlib_assert(fd->f_inode == inode);
- int ret = close_wimlib_fd(fd);
- if (ret != 0)
- return ret;
- j++;
- }
- }
- return 0;
+ DEBUG("Sending unmount finished msg");
+ struct msg_unmount_finished msg = {
+ .hdr = {
+ .min_version = WIMLIB_MAKEVERSION(1, 2, 0),
+ .cur_version = WIMLIB_VERSION_CODE,
+ .msg_type = MSG_TYPE_UNMOUNT_FINISHED,
+ .msg_size = sizeof(msg),
+ },
+ .status = status,
+ };
+ if (mq_send(mq, (void*)&msg, sizeof(msg), 1))
+ ERROR_WITH_ERRNO("Failed to send status to unmount process");
}
-/* Overwrites the WIM file, with changes saved. */
-static int rebuild_wim(struct wimfs_context *ctx, int write_flags)
+static int msg_unmount_request_handler(const void *_msg,
+ struct msg_handler_context *handler_ctx)
{
+ const struct msg_unmount_request *msg;
+ struct wimfs_context *wimfs_ctx;
+ int status = 0;
int ret;
- struct lookup_table_entry *lte, *tmp;
- WIMStruct *w = ctx->wim;
+ int unmount_flags;
- DEBUG("Closing all staging file descriptors.");
- list_for_each_entry_safe(lte, tmp, &ctx->staging_list, staging_list) {
- ret = inode_close_fds(lte->lte_inode);
- if (ret != 0)
- return ret;
- }
+ DEBUG("Handling unmount request msg");
- DEBUG("Calculating SHA1 checksums for all new staging files.");
- list_for_each_entry(lte, &ctx->staging_list, staging_list) {
- ret = update_lte_of_staging_file(lte, w->lookup_table);
- if (ret != 0)
- return ret;
+ msg = _msg;
+ wimfs_ctx = handler_ctx->daemon.wimfs_ctx;
+
+ if (msg->hdr.msg_size < sizeof(*msg)) {
+ status = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ goto out;
}
- xml_update_image_info(w, w->current_image);
- ret = wimlib_overwrite(w, write_flags, 0, NULL);
- if (ret != 0)
- ERROR("Failed to commit changes to mounted WIM image");
- return ret;
-}
+ unmount_flags = msg->unmount_flags;
-/* Send a message to the filesystem daemon saying whether to commit or not. */
-static int send_unmount_request(struct wimfs_context *ctx, int unmount_flags)
-{
- int ret;
- struct unmount_request msg;
+ ret = send_daemon_info_msg(wimfs_ctx->daemon_to_unmount_mq, getpid(),
+ wimfs_ctx->mount_flags);
+ if (ret != 0) {
+ status = ret;
+ goto out;
+ }
- msg.hdr.min_version = WIMLIB_MAKEVERSION(1, 2, 0);
- msg.hdr.cur_version = WIMLIB_VERSION_CODE;
- msg.hdr.data_size = sizeof(msg.data);
- msg.data.unmount_flags = unmount_flags;
+ if (wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT) {
+ int write_flags = 0;
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY)
+ write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_REBUILD)
+ write_flags |= WIMLIB_WRITE_FLAG_REBUILD;
+ if (unmount_flags & WIMLIB_UNMOUNT_FLAG_RECOMPRESS)
+ write_flags |= WIMLIB_WRITE_FLAG_RECOMPRESS;
+ status = rebuild_wim(wimfs_ctx, write_flags);
+ }
+ } else {
+ DEBUG("Read-only mount");
+ status = 0;
+ }
- ret = mq_send(ctx->unmount_to_daemon_mq, (void*)&msg,
- sizeof(msg), 1);
- if (ret == -1) {
- ERROR_WITH_ERRNO("Failed to notify filesystem daemon whether "
- "we want to commit changes or not");
- return WIMLIB_ERR_MQUEUE;
+out:
+ if (wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
+ ret = delete_staging_dir(wimfs_ctx);
+ if (ret != 0) {
+ ERROR("Failed to delete the staging directory");
+ if (status == 0)
+ status = ret;
+ }
}
+ send_unmount_finished_msg(wimfs_ctx->daemon_to_unmount_mq, status);
+ return MSG_BREAK_LOOP;
+}
+
+static int msg_daemon_info_handler(const void *_msg,
+ struct msg_handler_context *handler_ctx)
+{
+ const struct msg_daemon_info *msg = _msg;
+ DEBUG("Handling daemon info msg");
+ if (msg->hdr.msg_size < sizeof(*msg))
+ return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ handler_ctx->unmount.daemon_pid = msg->daemon_pid;
+ handler_ctx->unmount.mount_flags = msg->mount_flags;
+ handler_ctx->timeout_seconds = 1;
+ DEBUG("pid of daemon is %d; mount flags were %#x",
+ handler_ctx->unmount.daemon_pid,
+ handler_ctx->unmount.mount_flags);
return 0;
}
-static int receive_unmount_request(struct wimfs_context *ctx,
- int *unmount_flags)
+static int msg_unmount_finished_handler(const void *_msg,
+ struct msg_handler_context *handler_ctx)
{
- void *mailbox;
- long msgsize;
- struct timeval now;
- struct timespec timeout;
- ssize_t bytes_received;
- struct unmount_request *msg;
- int ret;
-
- ret = get_mailbox(ctx->unmount_to_daemon_mq,
- sizeof(struct unmount_request),
- &msgsize, &mailbox);
- if (ret != 0)
- return ret;
-
- /* Wait at most 3 seconds before giving up and discarding changes. */
- gettimeofday(&now, NULL);
- timeout.tv_sec = now.tv_sec + 3;
- timeout.tv_nsec = now.tv_usec * 1000;
+ const struct msg_unmount_finished *msg = _msg;
+ DEBUG("Handling unmount finished message");
+ if (msg->hdr.msg_size < sizeof(*msg))
+ return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ handler_ctx->unmount.status = msg->status;
+ DEBUG("status is %d", handler_ctx->unmount.status);
+ return MSG_BREAK_LOOP;
+}
- bytes_received = mq_timedreceive(ctx->unmount_to_daemon_mq, mailbox,
- msgsize, NULL, &timeout);
- msg = mailbox;
- if (bytes_received == -1) {
- ERROR_WITH_ERRNO("mq_timedreceive()");
- ERROR("Not committing.");
- ret = WIMLIB_ERR_MQUEUE;
- } else if (bytes_received < sizeof(struct unmount_message_header) ||
- bytes_received != sizeof(struct unmount_message_header) + msg->hdr.data_size) {
- ERROR("Received invalid unmount request");
- ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- } else if (WIMLIB_VERSION_CODE < msg->hdr.min_version) {
- ERROR("Cannot understand the unmount request. "
- "Please upgrade wimlib to at least v%d.%d.%d",
- WIMLIB_GET_MAJOR_VERSION(msg->hdr.min_version),
- WIMLIB_GET_MINOR_VERSION(msg->hdr.min_version),
- WIMLIB_GET_PATCH_VERSION(msg->hdr.min_version));
- ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+static int unmount_timed_out_cb(struct msg_handler_context *handler_ctx)
+{
+ if (handler_ctx->unmount.daemon_pid == 0) {
+ goto out_crashed;
} else {
- *unmount_flags = msg->data.unmount_flags;
- ret = 0;
+ kill(handler_ctx->unmount.daemon_pid, 0);
+ if (errno == ESRCH) {
+ goto out_crashed;
+ } else {
+ DEBUG("Filesystem daemon is still alive... "
+ "Waiting another %d seconds\n",
+ handler_ctx->timeout_seconds);
+ return 0;
+ }
}
- FREE(mailbox);
- return ret;
+out_crashed:
+ ERROR("The filesystem daemon has crashed! Changes to the "
+ "WIM may not have been commited.");
+ return WIMLIB_ERR_FILESYSTEM_DAEMON_CRASHED;
}
-static void send_unmount_response(struct wimfs_context *ctx, int status)
+static int daemon_timed_out_cb(struct msg_handler_context *handler_ctx)
{
- struct unmount_response response;
- response.hdr.min_version = WIMLIB_MAKEVERSION(1, 2, 0);
- response.hdr.cur_version = WIMLIB_VERSION_CODE;
- response.hdr.data_size = sizeof(response.data);
- response.data.status = status;
- response.data.mount_flags = ctx->mount_flags;
- if (mq_send(ctx->daemon_to_unmount_mq, (void*)&response,
- sizeof(response), 1))
- ERROR_WITH_ERRNO("Failed to send status to unmount process");
+ DEBUG("Timed out");
+ return WIMLIB_ERR_TIMEOUT;
}
-/* Wait for a message from the filesytem daemon indicating whether the
- * filesystem was unmounted successfully. This may
- * take a long time if a big WIM file needs to be rewritten.
- *
- * Wait at most 600??? seconds before giving up and returning an error. Either
- * it's a really big WIM file, or (more likely) the filesystem daemon has
- * crashed or failed for some reason.
- *
- * XXX come up with some method to determine if the filesystem daemon has really
- * crashed or not.
- *
- * XXX Idea: have mount daemon write its PID into the WIM file header? No, this
- * wouldn't work because we know the directory but not the WIM file...
- */
-static int receive_unmount_response(struct wimfs_context *ctx)
+typedef int (*msg_handler_t)(const void *_msg,
+ struct msg_handler_context *handler_ctx);
+
+struct msg_handler_callbacks {
+ int (*timed_out)(struct msg_handler_context *);
+ msg_handler_t msg_handlers[MSG_TYPE_MAX];
+};
+
+static const struct msg_handler_callbacks unmount_msg_handler_callbacks = {
+ .timed_out = unmount_timed_out_cb,
+ .msg_handlers = {
+ [MSG_TYPE_DAEMON_INFO] = msg_daemon_info_handler,
+ [MSG_TYPE_UNMOUNT_FINISHED] = msg_unmount_finished_handler,
+ },
+};
+
+static const struct msg_handler_callbacks daemon_msg_handler_callbacks = {
+ .timed_out = daemon_timed_out_cb,
+ .msg_handlers = {
+ [MSG_TYPE_UNMOUNT_REQUEST] = msg_unmount_request_handler,
+ },
+};
+
+static int receive_message(mqd_t mq, struct msg_handler_context *handler_ctx,
+ const msg_handler_t msg_handlers[],
+ long mailbox_size, void *mailbox)
{
- long msgsize;
- void *mailbox;
struct timeval now;
struct timespec timeout;
ssize_t bytes_received;
+ struct unmount_msg_hdr *hdr;
int ret;
- struct unmount_response *msg;
-
- ret = get_mailbox(ctx->daemon_to_unmount_mq,
- sizeof(struct unmount_response), &msgsize, &mailbox);
- if (ret != 0)
- return ret;
-
- DEBUG("Waiting for message telling us whether the unmount was "
- "successful or not.");
gettimeofday(&now, NULL);
- timeout.tv_sec = now.tv_sec + 600;
+ timeout.tv_sec = now.tv_sec + handler_ctx->timeout_seconds;
timeout.tv_nsec = now.tv_usec * 1000;
- bytes_received = mq_timedreceive(ctx->daemon_to_unmount_mq,
- mailbox, msgsize, NULL, &timeout);
- msg = mailbox;
+
+ bytes_received = mq_timedreceive(mq, mailbox,
+ mailbox_size, NULL, &timeout);
+ hdr = mailbox;
if (bytes_received == -1) {
if (errno == ETIMEDOUT) {
- ERROR("Timed out- probably the filesystem daemon "
- "crashed and the WIM was not written "
- "successfully.");
ret = WIMLIB_ERR_TIMEOUT;
} else {
- ERROR_WITH_ERRNO("mq_receive()");
+ ERROR_WITH_ERRNO("mq_timedreceive()");
ret = WIMLIB_ERR_MQUEUE;
}
- } else if (bytes_received < sizeof(struct unmount_message_header) ||
- bytes_received != sizeof(struct unmount_message_header) + msg->hdr.data_size ||
- WIMLIB_VERSION_CODE < msg->hdr.min_version) {
- ERROR("Received invalid unmount response");
+ } else if (bytes_received < sizeof(*hdr) ||
+ bytes_received != hdr->msg_size) {
ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
- } else if (WIMLIB_VERSION_CODE < msg->hdr.min_version) {
- ERROR("Cannot understand the unmount response. "
- "Please upgrade wimlib to at least v%d.%d.%d",
- WIMLIB_GET_MAJOR_VERSION(msg->hdr.min_version),
- WIMLIB_GET_MINOR_VERSION(msg->hdr.min_version),
- WIMLIB_GET_PATCH_VERSION(msg->hdr.min_version));
+ } else if (WIMLIB_VERSION_CODE < hdr->min_version) {
+ /*ERROR("Cannot understand the received message. "*/
+ /*"Please upgrade wimlib to at least v%d.%d.%d",*/
+ /*WIMLIB_GET_MAJOR_VERSION(hdr->min_version),*/
+ /*WIMLIB_GET_MINOR_VERSION(hdr->min_version),*/
+ /*WIMLIB_GET_PATCH_VERSION(hdr->min_version));*/
+ ret = MSG_VERSION_TOO_HIGH;
+ } else if (hdr->msg_type >= MSG_TYPE_MAX) {
+ ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ } else if (msg_handlers[hdr->msg_type] == NULL) {
ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
} else {
- ret = msg->data.status;
- if (ret) {
- ERROR("A failure status (%d) was returned "
- "by the filesystem daemon", ret);
+ ret = msg_handlers[hdr->msg_type](mailbox, handler_ctx);
+ }
+ return ret;
+}
+
+static int message_loop(mqd_t mq,
+ const struct msg_handler_callbacks *callbacks,
+ struct msg_handler_context *handler_ctx)
+{
+ static const size_t MAX_MSG_SIZE = 512;
+ long msgsize;
+ void *mailbox;
+ int ret;
+
+ DEBUG("Entering message loop");
+
+ ret = get_mailbox(mq, MAX_MSG_SIZE, &msgsize, &mailbox);
+ if (ret != 0)
+ return ret;
+ while (1) {
+ ret = receive_message(mq, handler_ctx,
+ callbacks->msg_handlers,
+ msgsize, mailbox);
+ if (ret == 0 || ret == MSG_VERSION_TOO_HIGH) {
+ continue;
+ } else if (ret == MSG_BREAK_LOOP) {
+ ret = 0;
+ break;
+ } else if (ret == WIMLIB_ERR_TIMEOUT) {
+ if (callbacks->timed_out)
+ ret = callbacks->timed_out(handler_ctx);
+ if (ret == 0)
+ continue;
+ else
+ break;
+ } else {
+ ERROR_WITH_ERRNO("Error communicating with "
+ "filesystem daemon");
+ break;
}
}
FREE(mailbox);
+ DEBUG("Exiting message loop");
return ret;
}
/* Called when the filesystem is unmounted. */
static void wimfs_destroy(void *p)
{
- /* The `imagex unmount' command, which is running in a separate process
- * and is executing the wimlib_unmount() function, will send this
- * process a `struct unmount_request' through a message queue that
- * specifies some unmount options, such as other to commit changes or
- * not. */
+ struct wimfs_context *wimfs_ctx;
- int ret;
- int unmount_flags;
- struct wimfs_context *ctx;
- int status;
+ wimfs_ctx = wimfs_get_context();
- ctx = wimfs_get_context();
- if (open_message_queues(ctx, true))
+ if (open_message_queues(wimfs_ctx, true))
return;
- ret = receive_unmount_request(ctx, &unmount_flags);
- status = ret;
- if (ret == 0) {
- if (ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- if (unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT) {
- int write_flags = 0;
- if (unmount_flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY)
- write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
- if (unmount_flags & WIMLIB_UNMOUNT_FLAG_REBUILD)
- write_flags |= WIMLIB_WRITE_FLAG_REBUILD;
- if (unmount_flags & WIMLIB_UNMOUNT_FLAG_RECOMPRESS)
- write_flags |= WIMLIB_WRITE_FLAG_RECOMPRESS;
- status = rebuild_wim(ctx, write_flags);
- }
- ret = delete_staging_dir(ctx);
- if (ret != 0) {
- ERROR("Failed to delete the staging directory");
- if (status == 0)
- status = ret;
- }
- } else {
- DEBUG("Read-only mount");
- }
- }
- send_unmount_response(ctx, status);
- close_message_queues(ctx);
+ struct msg_handler_context handler_ctx = {
+ .is_daemon = true,
+ .timeout_seconds = 5,
+ .daemon = {
+ .wimfs_ctx = wimfs_ctx,
+ },
+ };
+
+ message_loop(wimfs_ctx->unmount_to_daemon_mq,
+ &daemon_msg_handler_callbacks,
+ &handler_ctx);
+
+ close_message_queues(wimfs_ctx);
}
#if 0
wimlib_progress_func_t progress_func)
{
int ret;
- struct wimfs_context ctx;
+ struct wimfs_context wimfs_ctx;
- init_wimfs_context(&ctx);
+ init_wimfs_context(&wimfs_ctx);
- ret = set_message_queue_names(&ctx, dir);
+ ret = set_message_queue_names(&wimfs_ctx, dir);
if (ret != 0)
goto out;
- ret = open_message_queues(&ctx, false);
+ ret = open_message_queues(&wimfs_ctx, false);
if (ret != 0)
goto out_free_message_queue_names;
- ret = send_unmount_request(&ctx, unmount_flags);
+ ret = send_unmount_request_msg(wimfs_ctx.unmount_to_daemon_mq,
+ unmount_flags);
if (ret != 0)
goto out_close_message_queues;
ret = execute_fusermount(dir);
if (ret != 0)
goto out_close_message_queues;
- ret = receive_unmount_response(&ctx);
+
+ struct msg_handler_context handler_ctx = {
+ .is_daemon = false,
+ .timeout_seconds = 5,
+ .unmount = {
+ .daemon_pid = 0,
+ },
+ };
+
+ ret = message_loop(wimfs_ctx.daemon_to_unmount_mq,
+ &unmount_msg_handler_callbacks,
+ &handler_ctx);
+ if (ret == 0)
+ ret = handler_ctx.unmount.status;
out_close_message_queues:
- close_message_queues(&ctx);
+ close_message_queues(&wimfs_ctx);
out_free_message_queue_names:
- free_message_queue_names(&ctx);
+ free_message_queue_names(&wimfs_ctx);
out:
return ret;
}
git://wimlib.net / wimlib / blobdiff