#include "sha1.h"
#include "lookup_table.h"
#include "xml.h"
-#include "io.h"
+#include "buffer_io.h"
#include "timestamp.h"
#include <limits.h>
#include <stdlib.h>
#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;
/* Flags passed to wimlib_mount(). */
int mount_flags;
+ int default_lookup_flags;
+
/* Next inode number to be assigned. */
u64 next_ino;
/* List of lookup table entries in the staging directory */
struct list_head staging_list;
+ /* List of inodes in the mounted image */
+ struct hlist_head *image_inode_list;
+
/* Name and message queue descriptors for message queues between the filesystem
* daemon process and the unmount process. These are used when the filesystem
* is unmounted and the process running wimlib_mount() (i.e. the `imagex
static inline int get_lookup_flags(const struct wimfs_context *ctx)
{
- if (ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
- return LOOKUP_FLAG_ADS_OK;
- else
- return 0;
+ return ctx->default_lookup_flags;
}
/* Returns nonzero if write permission is requested on the file open flags */
static void inode_put_fd(struct inode *inode, struct wimlib_fd *fd)
{
- wimlib_assert(fd != NULL);
wimlib_assert(inode != NULL);
pthread_mutex_lock(&inode->i_mutex);
static int lte_put_fd(struct lookup_table_entry *lte, struct wimlib_fd *fd)
{
- wimlib_assert(fd != NULL);
wimlib_assert(fd->f_lte == lte);
if (!lte) /* Empty stream with no lookup table entry */
static int close_wimlib_fd(struct wimlib_fd *fd)
{
int ret;
- wimlib_assert(fd != NULL);
DEBUG("Closing fd (inode = %lu, opened = %u, allocated = %u)",
fd->f_inode->ino, fd->f_inode->num_opened_fds,
fd->f_inode->num_allocated_fds);
return 0;
}
+static int create_dentry(struct wimfs_context *ctx, const char *path,
+ struct dentry **dentry_ret)
+{
+ struct dentry *parent;
+ struct dentry *new;
+ const char *basename;
+
+ parent = get_parent_dentry(ctx->wim, path);
+ if (!parent)
+ return -ENOENT;
+
+ if (!dentry_is_directory(parent))
+ return -ENOTDIR;
+
+ basename = path_basename(path);
+ if (get_dentry_child_with_name(parent, basename))
+ return -EEXIST;
+
+ new = new_dentry_with_inode(basename);
+ if (!new)
+ return -ENOMEM;
+
+ new->d_inode->resolved = 1;
+ new->d_inode->ino = ctx->next_ino++;
+ dentry_add_child(parent, new);
+ hlist_add_head(&new->d_inode->hlist, ctx->image_inode_list);
+ *dentry_ret = new;
+ return 0;
+}
+
/* Remove a dentry; i.e. remove a reference to the corresponding inode.
*
* If there are no remaining references to the inode either through dentries or
put_dentry(dentry);
}
+/* Transfers file attributes from a struct inode to a `stat' buffer.
+ *
+ * The lookup table entry tells us which stream in the inode we are statting.
+ * For a named data stream, everything returned is the same as the unnamed data
+ * stream except possibly the size and block count. */
+static int inode_to_stbuf(const struct inode *inode,
+ struct lookup_table_entry *lte, struct stat *stbuf)
+{
+ if (inode_is_symlink(inode))
+ stbuf->st_mode = S_IFLNK | 0777;
+ else if (inode_is_directory(inode))
+ stbuf->st_mode = S_IFDIR | 0755;
+ else
+ stbuf->st_mode = S_IFREG | 0755;
+
+ stbuf->st_ino = (ino_t)inode->ino;
+ stbuf->st_nlink = inode->link_count;
+ stbuf->st_uid = getuid();
+ stbuf->st_gid = getgid();
+
+ if (lte) {
+ if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
+ struct stat native_stat;
+ if (stat(lte->staging_file_name, &native_stat) != 0) {
+ DEBUG("Failed to stat `%s': %m",
+ lte->staging_file_name);
+ return -errno;
+ }
+ stbuf->st_size = native_stat.st_size;
+ } else {
+ stbuf->st_size = wim_resource_size(lte);
+ }
+ } else {
+ stbuf->st_size = 0;
+ }
+
+ stbuf->st_atime = wim_timestamp_to_unix(inode->last_access_time);
+ stbuf->st_mtime = wim_timestamp_to_unix(inode->last_write_time);
+ stbuf->st_ctime = wim_timestamp_to_unix(inode->creation_time);
+ stbuf->st_blocks = (stbuf->st_size + 511) / 512;
+ return 0;
+}
+
/* Creates a new staging file and returns its file descriptor opened for
* writing.
*
* extract, or NULL if there was no lookup table entry present for the stream
*
* @size: Number of bytes of the stream we want to extract (this supports the
- * wimfs_truncate() function).
+ * wimfs_truncate() function). It may be more than the actual stream length, in
+ * which case the extra space is filled with zeroes.
+ *
+ * @ctx: Context for the WIM filesystem.
+ *
+ * Returns 0 on success or a negative error code on failure.
*/
static int extract_resource_to_staging_dir(struct inode *inode,
u32 stream_id,
int ret;
int fd;
struct lookup_table_entry *old_lte, *new_lte;
+ off_t extract_size;
DEBUG("Extracting resource to staging dir: inode %"PRIu64", "
"stream id %"PRIu32, inode->ino, stream_id);
old_lte = *lte;
+
+ wimlib_assert(old_lte == NULL ||
+ old_lte->resource_location != RESOURCE_IN_STAGING_FILE);
+
+ /* Create the staging file */
fd = create_staging_file(&staging_file_name, O_WRONLY, ctx);
if (fd == -1)
return -errno;
- if (old_lte)
- ret = extract_wim_resource_to_fd(old_lte, fd, size);
- else
+ /* Extract the stream to the staging file (possibly truncated) */
+ if (old_lte) {
+ extract_size = min(wim_resource_size(old_lte), size);
+ ret = extract_wim_resource_to_fd(old_lte, fd, extract_size);
+ } else {
ret = 0;
+ extract_size = 0;
+ }
+
+ /* In the case of truncate() to more than the file length, extend the
+ * file with zeroes by calling ftruncate() on the underlying staging
+ * file */
+ if (ret == 0 && size > extract_size)
+ ret = ftruncate(fd, size);
+
+ /* Close the staging file descriptor and check for errors. If there's
+ * an error, unlink the staging file. */
if (ret != 0 || close(fd) != 0) {
if (errno != 0)
ret = -errno;
goto out_delete_staging_file;
}
+ /* Now deal with the lookup table entries. We may be able to re-use the
+ * existing entry, but we may have to create a new one instead. */
+
if (old_lte && inode->link_count == old_lte->refcnt) {
- /* The reference count of the existing lookup table
- * entry is the same as the link count of the inode that
- * contains the stream we're opening. Therefore, ALL
- * the references to the lookup table entry correspond
- * to the stream we're trying to extract, so the lookup
- * table entry can be re-used. */
+ /* The reference count of the existing lookup table entry is the
+ * same as the link count of the inode that contains the stream
+ * we're opening. Therefore, ALL the references to the lookup
+ * table entry correspond to the stream we're trying to extract,
+ * so the lookup table entry can be re-used. */
DEBUG("Re-using lookup table entry");
lookup_table_unlink(ctx->wim->lookup_table, old_lte);
new_lte = old_lte;
} else {
if (old_lte) {
/* There's an existing lookup table entry, but its
- * reference count is creater than the link count for
+ * reference count is greater than the link count for
* the inode containing a stream we're opening.
* Therefore, we need to split the lookup table entry.
- * */
+ */
wimlib_assert(old_lte->refcnt > inode->link_count);
DEBUG("Splitting lookup table entry "
"(inode->link_count = %u, old_lte->refcnt = %u)",
inode->link_count, old_lte->refcnt);
-
}
new_lte = new_lookup_table_entry();
}
}
- new_lte->resource_entry.original_size = size;
new_lte->refcnt = inode->link_count;
new_lte->resource_location = RESOURCE_IN_STAGING_FILE;
new_lte->staging_file_name = staging_file_name;
* Creates a randomly named staging directory and saves its name in the
* filesystem context structure.
*/
-static int make_staging_dir(struct wimfs_context *ctx,
- const char *user_prefix)
+static int make_staging_dir(struct wimfs_context *ctx, const char *user_prefix)
{
static const size_t random_suffix_len = 10;
static const char *common_suffix = ".staging";
}
}
-
/*
* Deletes the staging directory and all the files contained in it.
*/
static int delete_staging_dir(struct wimfs_context *ctx)
{
int ret;
- wimlib_assert(ctx->staging_dir_name != NULL);
ret = nftw(ctx->staging_dir_name, remove_file_or_directory,
10, FTW_DEPTH);
FREE(ctx->staging_dir_name);
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,
+ wimlib_progress_func_t progress_func)
+{
+ 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, progress_func);
+ 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)
dir_path = realpath(mount_dir, NULL);
if (!dir_path) {
ERROR_WITH_ERRNO("Failed to resolve path \"%s\"", mount_dir);
- return WIMLIB_ERR_NOTDIR;
+ if (errno == ENOMEM)
+ return WIMLIB_ERR_NOMEM;
+ else
+ return WIMLIB_ERR_NOTDIR;
}
- DEBUG("Using absolute dir_path = `%s'", dir_path);
-
-
p = dir_path;
while (*p) {
if (*p == '/')
* 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.
*/
static int open_message_queues(struct wimfs_context *ctx, bool daemon)
{
- int flags;
- int ret;
-
- wimlib_assert(ctx->unmount_to_daemon_mq_name != NULL &&
- ctx->daemon_to_unmount_mq_name != NULL);
+ int unmount_to_daemon_mq_flags = O_WRONLY | O_CREAT;
+ int daemon_to_unmount_mq_flags = O_RDONLY | O_CREAT;
if (daemon)
- flags = O_RDONLY | O_CREAT;
- else
- flags = O_WRONLY | O_CREAT;
+ swap(unmount_to_daemon_mq_flags, daemon_to_unmount_mq_flags);
DEBUG("Opening message queue \"%s\"", ctx->unmount_to_daemon_mq_name);
ctx->unmount_to_daemon_mq = mq_open(ctx->unmount_to_daemon_mq_name,
- flags, 0700, NULL);
+ unmount_to_daemon_mq_flags, 0700, NULL);
if (ctx->unmount_to_daemon_mq == (mqd_t)-1) {
ERROR_WITH_ERRNO("mq_open()");
- ret = WIMLIB_ERR_MQUEUE;
- goto out;
+ return WIMLIB_ERR_MQUEUE;
}
- if (daemon)
- flags = O_WRONLY | O_CREAT;
- else
- flags = O_RDONLY | O_CREAT;
-
DEBUG("Opening message queue \"%s\"", ctx->daemon_to_unmount_mq_name);
ctx->daemon_to_unmount_mq = mq_open(ctx->daemon_to_unmount_mq_name,
- flags, 0700, NULL);
+ daemon_to_unmount_mq_flags, 0700, NULL);
if (ctx->daemon_to_unmount_mq == (mqd_t)-1) {
ERROR_WITH_ERRNO("mq_open()");
- ret = WIMLIB_ERR_MQUEUE;
- goto out_close_unmount_to_daemon_mq;
+ mq_close(ctx->unmount_to_daemon_mq);
+ mq_unlink(ctx->unmount_to_daemon_mq_name);
+ ctx->unmount_to_daemon_mq = (mqd_t)-1;
+ return WIMLIB_ERR_MQUEUE;
}
- ret = 0;
- goto out;
-out_close_unmount_to_daemon_mq:
- mq_close(ctx->unmount_to_daemon_mq);
- mq_unlink(ctx->unmount_to_daemon_mq_name);
- ctx->unmount_to_daemon_mq = (mqd_t)-1;
-out:
- return ret;
+ return 0;
}
/* Try to determine the maximum message size of a message queue. The return
}
static int get_mailbox(mqd_t mq, long needed_msgsize, long *msgsize_ret,
- char **mailbox_ret)
+ void **mailbox_ret)
{
long msgsize;
char *mailbox;
/* 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);
}
-static int wimfs_access(const char *path, int mask)
+
+struct unmount_msg_hdr {
+ u32 min_version;
+ u32 cur_version;
+ u32 msg_type;
+ u32 msg_size;
+} PACKED;
+
+struct msg_unmount_request {
+ struct unmount_msg_hdr hdr;
+ u32 unmount_flags;
+ u8 want_progress_messages;
+} 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;
+
+struct msg_write_streams_progress {
+ struct unmount_msg_hdr hdr;
+ union wimlib_progress_info info;
+} PACKED;
+
+enum {
+ MSG_TYPE_UNMOUNT_REQUEST,
+ MSG_TYPE_DAEMON_INFO,
+ MSG_TYPE_WRITE_STREAMS_PROGRESS,
+ MSG_TYPE_UNMOUNT_FINISHED,
+ MSG_TYPE_MAX,
+};
+
+struct msg_handler_context {
+ bool is_daemon;
+ int timeout_seconds;
+ union {
+ struct {
+ pid_t daemon_pid;
+ int mount_flags;
+ int status;
+ wimlib_progress_func_t progress_func;
+ } unmount;
+ struct {
+ struct wimfs_context *wimfs_ctx;
+ } daemon;
+ };
+};
+
+static int send_unmount_request_msg(mqd_t mq, int unmount_flags,
+ u8 want_progress_messages)
{
- /* Permissions not implemented */
+ 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,
+ .want_progress_messages = want_progress_messages,
+ };
+
+ 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 wimfs_chmod(const char *path, mode_t mask)
+static int send_daemon_info_msg(mqd_t mq, pid_t pid, int mount_flags)
{
- struct dentry *dentry;
- struct wimfs_context *ctx = wimfs_get_context();
- struct inode *inode;
- struct stat stbuf;
+ DEBUG("Sending daemon info msg (pid = %d, mount_flags=%x)",
+ pid, mount_flags);
+
+ 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 void send_unmount_finished_msg(mqd_t mq, int status)
+{
+ 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");
+}
+
+static int unmount_progress_func(enum wimlib_progress_msg msg,
+ const union wimlib_progress_info *info)
+{
+ if (msg == WIMLIB_PROGRESS_MSG_WRITE_STREAMS) {
+ struct msg_write_streams_progress msg = {
+ .hdr = {
+ .min_version = WIMLIB_MAKEVERSION(1, 2, 0),
+ .cur_version = WIMLIB_VERSION_CODE,
+ .msg_type = MSG_TYPE_WRITE_STREAMS_PROGRESS,
+ .msg_size = sizeof(msg),
+ },
+ .info = *info,
+ };
+ if (mq_send(wimfs_get_context()->daemon_to_unmount_mq,
+ (void*)&msg, sizeof(msg), 1))
+ {
+ ERROR_WITH_ERRNO("Failed to send status to unmount process");
+ }
+ }
+ return 0;
+}
+
+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;
+ int unmount_flags;
+ wimlib_progress_func_t progress_func;
- ret = lookup_resource(ctx->wim, path,
- get_lookup_flags(ctx) | LOOKUP_FLAG_DIRECTORY_OK,
- &dentry, NULL, NULL);
- if (ret != 0)
- return ret;
- inode = dentry->d_inode;
- inode_to_stbuf(inode, NULL, &stbuf);
- if (mask == stbuf.st_mode)
- return 0;
+ DEBUG("Handling unmount request msg");
+
+ msg = _msg;
+ wimfs_ctx = handler_ctx->daemon.wimfs_ctx;
+
+ if (msg->hdr.msg_size < sizeof(*msg)) {
+ status = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ goto out;
+ }
+
+ unmount_flags = msg->unmount_flags;
+ if (msg->want_progress_messages)
+ progress_func = unmount_progress_func;
else
- return -EPERM;
+ progress_func = NULL;
+ ret = send_daemon_info_msg(wimfs_ctx->daemon_to_unmount_mq, getpid(),
+ wimfs_ctx->mount_flags);
+ if (ret != 0) {
+ status = ret;
+ goto out;
+ }
+
+ 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,
+ progress_func);
+ }
+ } else {
+ DEBUG("Read-only mount");
+ status = 0;
+ }
+
+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 void inode_update_lte_ptr(struct inode *inode,
- struct lookup_table_entry *old_lte,
- struct lookup_table_entry *new_lte)
+static int msg_daemon_info_handler(const void *_msg,
+ struct msg_handler_context *handler_ctx)
{
- if (inode->lte == old_lte) {
- inode->lte = new_lte;
+ 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 msg_write_streams_progress_handler(const void *_msg,
+ struct msg_handler_context *handler_ctx)
+{
+ const struct msg_write_streams_progress *msg = _msg;
+ if (msg->hdr.msg_size < sizeof(*msg))
+ return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ if (handler_ctx->unmount.progress_func) {
+ handler_ctx->unmount.progress_func(WIMLIB_PROGRESS_MSG_WRITE_STREAMS,
+ &msg->info);
+ }
+ return 0;
+}
+
+static int msg_unmount_finished_handler(const void *_msg,
+ struct msg_handler_context *handler_ctx)
+{
+ 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;
+}
+
+static int unmount_timed_out_cb(struct msg_handler_context *handler_ctx)
+{
+ if (handler_ctx->unmount.daemon_pid == 0) {
+ goto out_crashed;
} 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;
- }
+ 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;
}
}
+out_crashed:
+ ERROR("The filesystem daemon has crashed! Changes to the "
+ "WIM may not have been commited.");
+ return WIMLIB_ERR_FILESYSTEM_DAEMON_CRASHED;
}
-static int update_lte_of_staging_file(struct lookup_table_entry *lte,
- struct lookup_table *table)
+static int daemon_timed_out_cb(struct msg_handler_context *handler_ctx)
{
- struct lookup_table_entry *duplicate_lte;
+ DEBUG("Timed out");
+ return WIMLIB_ERR_TIMEOUT;
+}
+
+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_WRITE_STREAMS_PROGRESS] = msg_write_streams_progress_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)
+{
+ struct timeval now;
+ struct timespec timeout;
+ ssize_t bytes_received;
+ struct unmount_msg_hdr *hdr;
int ret;
- u8 hash[SHA1_HASH_SIZE];
- struct stat stbuf;
- wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE);
- wimlib_assert(lte->staging_file_name);
+ gettimeofday(&now, NULL);
+ timeout.tv_sec = now.tv_sec + handler_ctx->timeout_seconds;
+ timeout.tv_nsec = now.tv_usec * 1000;
- ret = sha1sum(lte->staging_file_name, hash);
+ bytes_received = mq_timedreceive(mq, mailbox,
+ mailbox_size, NULL, &timeout);
+ hdr = mailbox;
+ if (bytes_received == -1) {
+ if (errno == ETIMEDOUT) {
+ ret = WIMLIB_ERR_TIMEOUT;
+ } else {
+ ERROR_WITH_ERRNO("mq_timedreceive()");
+ ret = WIMLIB_ERR_MQUEUE;
+ }
+ } else if (bytes_received < sizeof(*hdr) ||
+ bytes_received != hdr->msg_size) {
+ ret = WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE;
+ } 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_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;
+}
- lookup_table_unlink(table, lte);
+/* Execute `fusermount -u', which is installed setuid root, to unmount the WIM.
+ *
+ * FUSE does not yet implement synchronous unmounts. This means that fusermount
+ * -u will return before the filesystem daemon returns from wimfs_destroy().
+ * This is partly what we want, because we need to send a message from this
+ * process to the filesystem daemon telling whether --commit was specified or
+ * not. However, after that, the unmount process must wait for the filesystem
+ * daemon to finish writing the WIM file.
+ */
+static int execute_fusermount(const char *dir)
+{
+ pid_t pid;
+ int ret;
+ int status;
- duplicate_lte = __lookup_resource(table, hash);
+ pid = fork();
+ if (pid == -1) {
+ ERROR_WITH_ERRNO("Failed to fork()");
+ return WIMLIB_ERR_FORK;
+ }
+ if (pid == 0) {
+ /* Child */
+ execlp("fusermount", "fusermount", "-u", dir, NULL);
+ ERROR_WITH_ERRNO("Failed to execute `fusermount'");
+ exit(WIMLIB_ERR_FUSERMOUNT);
+ }
- if (duplicate_lte) {
- /* Merge duplicate lookup table entries */
- duplicate_lte->refcnt += lte->refcnt;
- list_del(<e->staging_list);
- 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;
+ /* Parent */
+ ret = wait(&status);
+ if (ret == -1) {
+ ERROR_WITH_ERRNO("Failed to wait for fusermount process to "
+ "terminate");
+ return WIMLIB_ERR_FUSERMOUNT;
+ }
+
+ if (status != 0) {
+ if (status == WIMLIB_ERR_FUSERMOUNT)
+ ERROR("Could not find the `fusermount' program");
+ else
+ ERROR("fusermount exited with status %d", status);
+
+ /* Try again, but with the `umount' program. This is required
+ * on other FUSE implementations such as FreeBSD's that do not
+ * have a `fusermount' program. */
+
+ pid = fork();
+ if (pid == -1) {
+ ERROR_WITH_ERRNO("Failed to fork()");
+ return WIMLIB_ERR_FORK;
+ }
+ if (pid == 0) {
+ /* Child */
+ execlp("umount", "umount", dir, NULL);
+ ERROR_WITH_ERRNO("Failed to execute `umount'");
+ exit(WIMLIB_ERR_FUSERMOUNT);
+ }
+
+ /* Parent */
+ ret = wait(&status);
+ if (ret == -1) {
+ ERROR_WITH_ERRNO("Failed to wait for `umount' process to "
+ "terminate");
+ return WIMLIB_ERR_FUSERMOUNT;
}
- 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->lte_inode = NULL;
- copy_hash(lte->hash, hash);
- lookup_table_insert(table, lte);
+ if (status != 0) {
+ ERROR("`umount' exited with failure status");
+ return WIMLIB_ERR_FUSERMOUNT;
}
}
return 0;
}
-static int inode_close_fds(struct inode *inode)
+static int wimfs_access(const char *path, int mask)
{
- 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++;
- }
- }
+ /* Permissions not implemented */
return 0;
}
-/* Overwrites the WIM file, with changes saved. */
-static int rebuild_wim(struct wimfs_context *ctx, int write_flags)
+static int wimfs_chmod(const char *path, mode_t mask)
{
+ struct dentry *dentry;
+ struct wimfs_context *ctx = wimfs_get_context();
+ struct inode *inode;
+ struct stat stbuf;
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_safe(lte, tmp, &ctx->staging_list, staging_list) {
- ret = update_lte_of_staging_file(lte, ctx->wim->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");
+ ret = lookup_resource(ctx->wim, path,
+ get_lookup_flags(ctx) | LOOKUP_FLAG_DIRECTORY_OK,
+ &dentry, NULL, NULL);
+ if (ret != 0)
return ret;
- }
- return ret;
+ inode = dentry->d_inode;
+ inode_to_stbuf(inode, NULL, &stbuf);
+ if (mask == stbuf.st_mode)
+ return 0;
+ else
+ return -EPERM;
}
/* Called when the filesystem is unmounted. */
static void wimfs_destroy(void *p)
{
- /* For read-write mounts, the `imagex unmount' command, which is
- * running in a separate process and is executing the
- * wimlib_unmount() function, will send this process a byte
- * through a message queue that indicates whether the --commit
- * option was specified or not. */
+ struct wimfs_context *wimfs_ctx;
- long msgsize;
- struct timespec timeout;
- struct timeval now;
- ssize_t bytes_received;
- int ret;
- char commit;
- char check_integrity;
- char status;
- char *mailbox;
- struct wimfs_context *ctx = wimfs_get_context();
- int write_flags;
+ wimfs_ctx = wimfs_get_context();
- if (open_message_queues(ctx, true))
+ if (open_message_queues(wimfs_ctx, true))
return;
- if (get_mailbox(ctx->unmount_to_daemon_mq, 2, &msgsize, &mailbox))
- goto out_close_message_queues;
-
- /* 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;
- DEBUG("Waiting for message telling us whether to commit or not, and "
- "whether to include integrity checks.");
+ struct msg_handler_context handler_ctx = {
+ .is_daemon = true,
+ .timeout_seconds = 5,
+ .daemon = {
+ .wimfs_ctx = wimfs_ctx,
+ },
+ };
- bytes_received = mq_timedreceive(ctx->unmount_to_daemon_mq, mailbox,
- msgsize, NULL, &timeout);
- if (bytes_received == -1) {
- ERROR_WITH_ERRNO("mq_timedreceive()");
- ERROR("Not committing.");
- commit = 0;
- check_integrity = 0;
- } else {
- DEBUG("Received message: [%d %d]", mailbox[0], mailbox[1]);
- commit = mailbox[0];
- check_integrity = mailbox[1];
- }
+ message_loop(wimfs_ctx->unmount_to_daemon_mq,
+ &daemon_msg_handler_callbacks,
+ &handler_ctx);
- status = 0;
- if (ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- if (commit) {
- if (check_integrity)
- write_flags = WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
- else
- write_flags = 0;
- 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");
- }
- DEBUG("Sending status %hhd", status);
- ret = mq_send(ctx->daemon_to_unmount_mq, &status, 1, 1);
- if (ret == -1)
- ERROR_WITH_ERRNO("Failed to send status to unmount process");
- FREE(mailbox);
-out_close_message_queues:
- close_message_queues(ctx);
+ close_message_queues(wimfs_ctx);
}
#if 0
struct inode *inode;
struct lookup_table_entry *lte;
WIMStruct *w = wimfs_get_WIMStruct();
+ u16 i;
inode = wim_pathname_to_inode(w, to);
if (!inode)
return -ENOENT;
- if (!inode_is_regular_file(inode))
+ if (inode->attributes & FILE_ATTRIBUTE_REPARSE_POINT)
+ return -EEXIST;
+
+ if (inode->attributes & FILE_ATTRIBUTE_DIRECTORY)
return -EPERM;
from_dentry_parent = get_parent_dentry(w, from);
if (!from_dentry)
return -ENOMEM;
-
inode_add_dentry(from_dentry, inode);
from_dentry->d_inode = inode;
inode->link_count++;
- for (unsigned i = 0; i <= inode->num_ads; i++) {
+ for (i = 0; i <= inode->num_ads; i++) {
lte = inode_stream_lte_resolved(inode, i);
if (lte)
lte->refcnt++;
}
-
dentry_add_child(from_dentry_parent, from_dentry);
return 0;
}
size_t needed_size;
struct inode *inode;
struct wimfs_context *ctx = wimfs_get_context();
+ u16 i;
+ char *p;
if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR))
return -ENOTSUP;
if (size == 0) {
needed_size = 0;
- for (u16 i = 0; i < inode->num_ads; i++)
+ for (i = 0; i < inode->num_ads; i++)
needed_size += inode->ads_entries[i].stream_name_utf8_len + 6;
return needed_size;
} else {
- char *p = list;
- for (u16 i = 0; i < inode->num_ads; i++) {
+ p = list;
+ for (i = 0; i < inode->num_ads; i++) {
needed_size = inode->ads_entries[i].stream_name_utf8_len + 6;
if (needed_size > size)
return -ERANGE;
}
#endif
-/*
- * Create a directory in the WIM.
- * @mode is currently ignored.
- */
+
+/* Create a directory in the WIM.
+ * @mode is currently ignored. */
static int wimfs_mkdir(const char *path, mode_t mode)
{
- struct dentry *parent;
- struct dentry *newdir;
- const char *basename;
- struct wimfs_context *ctx = wimfs_get_context();
-
- parent = get_parent_dentry(ctx->wim, path);
- if (!parent)
- return -ENOENT;
-
- if (!dentry_is_directory(parent))
- return -ENOTDIR;
-
- basename = path_basename(path);
- if (get_dentry_child_with_name(parent, basename))
- return -EEXIST;
+ struct dentry *dentry;
+ int ret;
- newdir = new_dentry_with_inode(basename);
- newdir->d_inode->attributes |= FILE_ATTRIBUTE_DIRECTORY;
- newdir->d_inode->resolved = true;
- newdir->d_inode->ino = ctx->next_ino++;
- dentry_add_child(parent, newdir);
- return 0;
+ ret = create_dentry(wimfs_get_context(), path, &dentry);
+ if (ret == 0)
+ dentry->d_inode->attributes = FILE_ATTRIBUTE_DIRECTORY;
+ return ret;
}
-/* Creates a regular file. */
+/* Create a regular file in the WIM.
+ * @mode is currently ignored. */
static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev)
{
const char *stream_name;
inode = wim_pathname_to_inode(ctx->wim, path);
if (!inode)
return -ENOENT;
- if (!inode_is_regular_file(inode))
+ if (inode->attributes &
+ (FILE_ATTRIBUTE_REPARSE_POINT | FILE_ATTRIBUTE_DIRECTORY))
return -ENOENT;
if (inode_get_ads_entry(inode, stream_name, NULL))
return -EEXIST;
new_entry = inode_add_ads(inode, stream_name);
if (!new_entry)
return -ENOMEM;
+ return 0;
} else {
- struct dentry *dentry, *parent;
- const char *basename;
+ struct dentry *dentry;
+ int ret;
/* Make a normal file (not an alternate data stream) */
-
- /* Make sure that the parent of @path exists and is a directory, and
- * that the dentry named by @path does not already exist. */
- parent = get_parent_dentry(ctx->wim, path);
- if (!parent)
- return -ENOENT;
- if (!dentry_is_directory(parent))
- return -ENOTDIR;
-
- basename = path_basename(path);
- if (get_dentry_child_with_name(parent, path))
- return -EEXIST;
-
- dentry = new_dentry_with_inode(basename);
- if (!dentry)
- return -ENOMEM;
- dentry->d_inode->resolved = true;
- dentry->d_inode->ino = ctx->next_ino++;
- dentry_add_child(parent, dentry);
+ ret = create_dentry(ctx, path, &dentry);
+ if (ret == 0)
+ dentry->d_inode->attributes = FILE_ATTRIBUTE_NORMAL;
+ return ret;
}
- return 0;
}
if (lte && lte->resource_location == RESOURCE_IN_STAGING_FILE) {
fd->staging_fd = open(lte->staging_file_name, fi->flags);
if (fd->staging_fd == -1) {
+ int errno_save = errno;
close_wimlib_fd(fd);
- return -errno;
+ return -errno_save;
}
}
fi->fh = (uintptr_t)fd;
off_t offset, struct fuse_file_info *fi)
{
struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh;
+ ssize_t ret;
if (!fd)
return -EBADF;
wimlib_assert(fd->f_lte->staging_file_name);
wimlib_assert(fd->staging_fd != -1);
- ssize_t ret;
DEBUG("Seek to offset %zu", offset);
if (lseek(fd->staging_fd, offset, SEEK_SET) == -1)
return ret;
} else {
/* Read from WIM */
-
- wimlib_assert(fd->f_lte->resource_location == RESOURCE_IN_WIM);
-
u64 res_size = wim_resource_size(fd->f_lte);
-
if (offset > res_size)
return -EOVERFLOW;
-
size = min(size, res_size - offset);
-
if (read_wim_resource(fd->f_lte, (u8*)buf,
size, offset,
WIMLIB_RESOURCE_FLAG_MULTITHREADED) != 0)
dst = get_dentry(w, to);
-
ret = get_names(&file_name_utf16, &file_name_utf8,
&file_name_utf16_len, &file_name_utf8_len,
path_basename(to));
static int wimfs_symlink(const char *to, const char *from)
{
- struct dentry *dentry_parent, *dentry;
- const char *link_name;
- struct inode *inode;
struct wimfs_context *ctx = wimfs_get_context();
+ struct dentry *dentry;
+ int ret;
- dentry_parent = get_parent_dentry(ctx->wim, from);
- if (!dentry_parent)
- return -ENOENT;
- if (!dentry_is_directory(dentry_parent))
- return -ENOTDIR;
-
- link_name = path_basename(from);
-
- if (get_dentry_child_with_name(dentry_parent, link_name))
- return -EEXIST;
- dentry = new_dentry_with_inode(link_name);
- if (!dentry)
- return -ENOMEM;
- inode = dentry->d_inode;
-
- inode->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
- inode->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
- inode->ino = ctx->next_ino++;
- inode->resolved = true;
-
- if (inode_set_symlink(inode, to, ctx->wim->lookup_table, NULL) != 0)
- goto out_free_dentry;
-
- dentry_add_child(dentry_parent, dentry);
- return 0;
-out_free_dentry:
- free_dentry(dentry);
- return -ENOMEM;
+ ret = create_dentry(ctx, from, &dentry);
+ if (ret == 0) {
+ dentry->d_inode->attributes = FILE_ATTRIBUTE_REPARSE_POINT;
+ dentry->d_inode->reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK;
+ if (inode_set_symlink(dentry->d_inode, to,
+ ctx->wim->lookup_table, NULL))
+ {
+ unlink_dentry(dentry);
+ free_dentry(dentry);
+ ret = -ENOMEM;
+ }
+ }
+ return ret;
}
if (ret != 0)
return ret;
- if (!lte) /* Already a zero-length file */
+ if (lte == NULL && size == 0)
return 0;
inode = dentry->d_inode;
-
if (stream_idx == 0)
stream_id = 0;
else
stream_id = inode->ads_entries[stream_idx - 1].stream_id;
if (lte->resource_location == RESOURCE_IN_STAGING_FILE) {
- wimlib_assert(lte->staging_file_name);
ret = truncate(lte->staging_file_name, size);
if (ret != 0)
- return -errno;
- lte->resource_entry.original_size = size;
+ ret = -errno;
} else {
- wimlib_assert(lte->resource_location == RESOURCE_IN_WIM);
/* File in WIM. Extract it to the staging directory, but only
* the first @size bytes of it. */
ret = extract_resource_to_staging_dir(inode, stream_id,
return ret;
}
-/* Remove a regular file */
+/* Unlink a non-directory or alternate data stream */
static int wimfs_unlink(const char *path)
{
struct dentry *dentry;
struct lookup_table *joined_tab, *wim_tab_save;
struct image_metadata *imd;
struct wimfs_context ctx;
+ struct hlist_node *cur_node;
+ struct inode *inode;
DEBUG("Mount: wim = %p, image = %d, dir = %s, flags = %d, ",
wim, image, dir, mount_flags);
}
ret = select_wim_image(wim, image);
-
if (ret != 0)
goto out;
- imd = &wim->image_metadata[image - 1];
-
DEBUG("Selected image %d", image);
+ imd = wim_get_current_image_metadata(wim);
+
if (imd->root_dentry->refcnt != 1) {
ERROR("Cannot mount image that was just exported with "
"wimlib_export_image()");
}
if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) {
- ret = lock_wim(wim->fp, wim->filename);
+ ret = lock_wim(wim, wim->fp);
if (ret != 0)
goto out;
}
init_wimfs_context(&ctx);
ctx.wim = wim;
ctx.mount_flags = mount_flags;
+ ctx.image_inode_list = &imd->inode_list;
+
+ if (mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
+ ctx.default_lookup_flags = LOOKUP_FLAG_ADS_OK;
DEBUG("Unlinking message queues in case they already exist");
ret = set_message_queue_names(&ctx, dir);
if (ret != 0)
- goto out;
+ goto out_unlock;
unlink_message_queues(&ctx);
DEBUG("Preparing arguments to fuse_main()");
* assign_inode_numbers() function, and the static variable @next_ino is
* set to the next available inode number.
*/
- char optstring[256] = "use_ino,subtype=wimfs,attr_timeout=0";
+ char optstring[256] =
+ "use_ino"
+ ",subtype=wimfs"
+ ",attr_timeout=0"
+#if FUSE_MAJOR_VERSION > 2 || (FUSE_MAJOR_VERSION == 2 && FUSE_MINOR_VERSION >= 8)
+ ",hard_remove"
+#endif
+ ;
argv[argc++] = "-o";
argv[argc++] = optstring;
if ((mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) {
imd->has_been_mounted_rw = 1;
}
- /* Resolve all the lookup table entries of the dentry tree */
- DEBUG("Resolving lookup table entries");
- for_dentry_in_tree(imd->root_dentry, dentry_resolve_ltes,
- wim->lookup_table);
+ /* Resolve the lookup table entries for every inode in the image, and
+ * assign inode numbers */
+ DEBUG("Resolving lookup table entries and assigning inode numbers");
- ctx.next_ino = assign_inode_numbers(&imd->inode_list);
+ ctx.next_ino = 1;
+ hlist_for_each_entry(inode, cur_node, &imd->inode_list, hlist) {
+ inode_resolve_ltes(inode, wim->lookup_table);
+ inode->ino = ctx.next_ino++;
+ }
+ /*ctx.next_ino = assign_inode_numbers(&imd->inode_list);*/
DEBUG("(next_ino = %"PRIu64")", ctx.next_ino);
-
DEBUG("Calling fuse_main()");
ret = fuse_main(argc, argv, &wimfs_operations, &ctx);
ret = WIMLIB_ERR_FUSE;
out_free_dir_copy:
FREE(dir_copy);
+out_unlock:
+ wim->wim_locked = 0;
out_free_message_queue_names:
free_message_queue_names(&ctx);
out:
return ret;
}
-
/*
* Unmounts the WIM file that was previously mounted on @dir by using
* wimlib_mount_image().
WIMLIBAPI int wimlib_unmount_image(const char *dir, int unmount_flags,
wimlib_progress_func_t progress_func)
{
- pid_t pid;
- int status;
int ret;
- char msg[2];
- struct timeval now;
- struct timespec timeout;
- long msgsize;
- struct wimfs_context ctx;
- char *mailbox;
+ struct wimfs_context wimfs_ctx;
- init_wimfs_context(&ctx);
+ init_wimfs_context(&wimfs_ctx);
- /* Open message queues between the unmount process and the
- * filesystem daemon. */
- 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;
- /* Send a message to the filesystem daemon saying whether to commit or
- * not. */
- msg[0] = (unmount_flags & WIMLIB_UNMOUNT_FLAG_COMMIT) ? 1 : 0;
- msg[1] = (unmount_flags & WIMLIB_UNMOUNT_FLAG_CHECK_INTEGRITY) ? 1 : 0;
-
- DEBUG("Sending message: %scommit, %scheck",
- (msg[0] ? "" : "don't "),
- (msg[1] ? "" : "don't "));
- ret = mq_send(ctx.unmount_to_daemon_mq, msg, 2, 1);
- if (ret == -1) {
- ERROR_WITH_ERRNO("Failed to notify filesystem daemon whether "
- "we want to commit changes or not");
- ret = WIMLIB_ERR_MQUEUE;
- goto out_close_message_queues;
- }
-
- /* Execute `fusermount -u', which is installed setuid root, to unmount
- * the WIM.
- *
- * FUSE does not yet implement synchronous unmounts. This means that
- * fusermount -u will return before the filesystem daemon returns from
- * wimfs_destroy(). This is partly what we want, because we need to
- * send a message from this process to the filesystem daemon telling
- * whether --commit was specified or not. However, after that, the
- * unmount process must wait for the filesystem daemon to finish writing
- * the WIM file.
- */
-
- pid = fork();
- if (pid == -1) {
- ERROR_WITH_ERRNO("Failed to fork()");
- ret = WIMLIB_ERR_FORK;
- goto out_close_message_queues;
- }
- if (pid == 0) {
- /* Child */
- execlp("fusermount", "fusermount", "-u", dir, NULL);
- ERROR_WITH_ERRNO("Failed to execute `fusermount'");
- exit(WIMLIB_ERR_FUSERMOUNT);
- }
-
- /* Parent */
- ret = wait(&status);
- if (ret == -1) {
- ERROR_WITH_ERRNO("Failed to wait for fusermount process to "
- "terminate");
- ret = WIMLIB_ERR_FUSERMOUNT;
+ ret = send_unmount_request_msg(wimfs_ctx.unmount_to_daemon_mq,
+ unmount_flags,
+ progress_func != NULL);
+ if (ret != 0)
goto out_close_message_queues;
- }
-
- if (status != 0) {
- ERROR("fusermount exited with status %d", status);
-
- /* Try again, but with the `umount' program. This is required
- * on other FUSE implementations such as FreeBSD's that do not
- * have a `fusermount' program. */
-
- pid = fork();
- if (pid == -1) {
- ERROR_WITH_ERRNO("Failed to fork()");
- ret = WIMLIB_ERR_FORK;
- goto out_close_message_queues;
- }
- if (pid == 0) {
- /* Child */
- execlp("umount", "umount", dir, NULL);
- ERROR_WITH_ERRNO("Failed to execute `umount'");
- exit(WIMLIB_ERR_FUSERMOUNT);
- }
-
- /* Parent */
- ret = wait(&status);
- if (ret == -1) {
- ERROR_WITH_ERRNO("Failed to wait for `umount' process to "
- "terminate");
- ret = WIMLIB_ERR_FUSERMOUNT;
- goto out_close_message_queues;
- }
- if (status != 0) {
- ERROR("`umount' exited with failure status");
- ret = WIMLIB_ERR_FUSERMOUNT;
- goto out_close_message_queues;
- }
- }
-
- wimlib_assert(status == 0);
- /* Wait for a message from the filesytem daemon indicating whether the
- * filesystem was unmounted successfully (0) or an error occurred (1).
- * 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 false.
- * 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...
- * */
-
- gettimeofday(&now, NULL);
- timeout.tv_sec = now.tv_sec + 600;
- timeout.tv_nsec = now.tv_usec * 1000;
-
- ret = get_mailbox(ctx.daemon_to_unmount_mq, 2, &msgsize, &mailbox);
+ ret = execute_fusermount(dir);
if (ret != 0)
goto out_close_message_queues;
- mailbox[0] = 0;
- DEBUG("Waiting for message telling us whether the unmount was "
- "successful or not.");
- ret = mq_timedreceive(ctx.daemon_to_unmount_mq, mailbox,
- msgsize, NULL, &timeout);
- if (ret == -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()");
- ret = WIMLIB_ERR_MQUEUE;
- }
- goto out_free_mailbox;
+ struct msg_handler_context handler_ctx = {
+ .is_daemon = false,
+ .timeout_seconds = 5,
+ .unmount = {
+ .daemon_pid = 0,
+ .progress_func = progress_func,
+ },
+ };
- }
- DEBUG("Received message: Unmount %s", (mailbox[0] ? "Failed" : "Ok"));
- ret = mailbox[0];
- if (ret)
- ERROR("Unmount failed");
-out_free_mailbox:
- FREE(mailbox);
+ 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