/* * mount_image.c * * This file implements mounting of WIM files using FUSE, which stands for * Filesystem in Userspace. FUSE allows a filesystem to be implemented in a * userspace process by implementing the filesystem primitives--- read(), * write(), readdir(), etc. */ /* * Copyright (C) 2012, 2013 Eric Biggers * * This file is part of wimlib, a library for working with WIM files. * * wimlib is free software; you can redistribute it and/or modify it under the * terms of the GNU General Public License as published by the Free * Software Foundation; either version 3 of the License, or (at your option) * any later version. * * wimlib 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 wimlib; if not, see http://www.gnu.org/licenses/. */ #include "wimlib_internal.h" #ifdef WITH_FUSE #ifdef __WIN32__ # error "FUSE mount not supported on Win32! Please configure --without-fuse" #endif #include "buffer_io.h" #include "lookup_table.h" #include "sha1.h" #include "timestamp.h" #include "xml.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #define FUSE_USE_VERSION 26 #include #ifdef ENABLE_XATTR #include #endif #define MSG_VERSION_TOO_HIGH -1 #define MSG_BREAK_LOOP -2 /* File descriptor to a file open on the WIM filesystem. */ struct wimfs_fd { struct wim_inode *f_inode; struct wim_lookup_table_entry *f_lte; int staging_fd; u16 idx; u32 stream_id; }; struct wimfs_context { /* The WIMStruct for the mounted WIM. */ WIMStruct *wim; /* Name of the staging directory for a read-write mount. Whenever a new file is * created, it is done so in the staging directory. Furthermore, whenever a * file in the WIM is modified, it is extracted to the staging directory. If * changes are commited when the WIM is unmounted, the file resources are merged * in from the staging directory when writing the new WIM. */ char *staging_dir_name; size_t staging_dir_name_len; /* Flags passed to wimlib_mount(). */ int mount_flags; /* Default flags to use when looking up a WIM dentry (depends on whether * the Windows interface to alternate data streams is being used or * not). */ int default_lookup_flags; /* Next inode number to be assigned. Note: I didn't bother with a * bitmap of free inode numbers since this isn't even a "real" * filesystem anyway. */ u64 next_ino; /* List of lookup table entries for files 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_unmount_image() (i.e. the `imagex unmount' command) needs to * communicate with the filesystem daemon running fuse_main() (i.e. the * daemon created by the `imagex mount' or `imagex mountrw' commands */ char *unmount_to_daemon_mq_name; char *daemon_to_unmount_mq_name; mqd_t unmount_to_daemon_mq; mqd_t daemon_to_unmount_mq; uid_t default_uid; gid_t default_gid; int status; bool have_status; }; static void init_wimfs_context(struct wimfs_context *ctx) { memset(ctx, 0, sizeof(*ctx)); ctx->unmount_to_daemon_mq = (mqd_t)-1; ctx->daemon_to_unmount_mq = (mqd_t)-1; INIT_LIST_HEAD(&ctx->staging_list); } #define WIMFS_CTX(fuse_ctx) ((struct wimfs_context*)(fuse_ctx)->private_data) static inline struct wimfs_context * wimfs_get_context() { return WIMFS_CTX(fuse_get_context()); } static inline WIMStruct * wimfs_get_WIMStruct() { return wimfs_get_context()->wim; } static inline bool wimfs_ctx_readonly(const struct wimfs_context *ctx) { return (ctx->mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) == 0; } static inline int get_lookup_flags(const struct wimfs_context *ctx) { return ctx->default_lookup_flags; } /* Returns nonzero if write permission is requested on the file open flags */ static inline int flags_writable(int open_flags) { return open_flags & (O_RDWR | O_WRONLY); } /* * Allocate a file descriptor for a stream. * * @inode: inode containing the stream we're opening * @stream_id: ID of the stream we're opening * @lte: Lookup table entry for the stream (may be NULL) * @fd_ret: Return the allocated file descriptor if successful. * @readonly: True if this is a read-only mount. * * Return 0 iff successful or error code if unsuccessful. */ static int alloc_wimfs_fd(struct wim_inode *inode, u32 stream_id, struct wim_lookup_table_entry *lte, struct wimfs_fd **fd_ret, bool readonly) { static const u16 fds_per_alloc = 8; static const u16 max_fds = 0xffff; int ret; pthread_mutex_lock(&inode->i_mutex); DEBUG("Allocating fd for stream ID %u from inode %#"PRIx64" " "(open = %u, allocated = %u)", stream_id, inode->i_ino, inode->i_num_opened_fds, inode->i_num_allocated_fds); if (inode->i_num_opened_fds == inode->i_num_allocated_fds) { struct wimfs_fd **fds; u16 num_new_fds; if (inode->i_num_allocated_fds == max_fds) { ret = -EMFILE; goto out; } num_new_fds = min(fds_per_alloc, max_fds - inode->i_num_allocated_fds); fds = REALLOC(inode->i_fds, (inode->i_num_allocated_fds + num_new_fds) * sizeof(inode->i_fds[0])); if (!fds) { ret = -ENOMEM; goto out; } memset(&fds[inode->i_num_allocated_fds], 0, num_new_fds * sizeof(fds[0])); inode->i_fds = fds; inode->i_num_allocated_fds += num_new_fds; } for (u16 i = 0; ; i++) { if (!inode->i_fds[i]) { struct wimfs_fd *fd = CALLOC(1, sizeof(*fd)); if (!fd) { ret = -ENOMEM; break; } fd->f_inode = inode; fd->f_lte = lte; fd->staging_fd = -1; fd->idx = i; fd->stream_id = stream_id; *fd_ret = fd; inode->i_fds[i] = fd; inode->i_num_opened_fds++; if (lte && !readonly) lte->num_opened_fds++; DEBUG("Allocated fd (idx = %u)", fd->idx); ret = 0; break; } } out: pthread_mutex_unlock(&inode->i_mutex); return ret; } static void inode_put_fd(struct wim_inode *inode, struct wimfs_fd *fd) { wimlib_assert(inode != NULL); pthread_mutex_lock(&inode->i_mutex); wimlib_assert(fd->f_inode == inode); wimlib_assert(inode->i_num_opened_fds != 0); wimlib_assert(fd->idx < inode->i_num_allocated_fds); wimlib_assert(inode->i_fds[fd->idx] == fd); inode->i_fds[fd->idx] = NULL; FREE(fd); if (--inode->i_num_opened_fds == 0 && inode->i_nlink == 0) { pthread_mutex_unlock(&inode->i_mutex); free_inode(inode); } else { pthread_mutex_unlock(&inode->i_mutex); } } static int lte_put_fd(struct wim_lookup_table_entry *lte, struct wimfs_fd *fd) { wimlib_assert(fd->f_lte == lte); if (!lte) /* Empty stream with no lookup table entry */ return 0; /* Close staging file descriptor if needed. */ if (lte->resource_location == RESOURCE_IN_STAGING_FILE && fd->staging_fd != -1) { if (close(fd->staging_fd) != 0) { ERROR_WITH_ERRNO("Failed to close staging file"); return -errno; } } lte_decrement_num_opened_fds(lte); return 0; } /* Close a file descriptor. */ static int close_wimfs_fd(struct wimfs_fd *fd) { int ret; DEBUG("Closing fd (ino = %#"PRIx64", opened = %u, allocated = %u)", fd->f_inode->i_ino, fd->f_inode->i_num_opened_fds, fd->f_inode->i_num_allocated_fds); ret = lte_put_fd(fd->f_lte, fd); if (ret != 0) return ret; inode_put_fd(fd->f_inode, fd); return 0; } /* * Add a new dentry with a new inode to a WIM image. * * Returns 0 on success, or negative error number on failure. */ static int create_dentry(struct fuse_context *fuse_ctx, const char *path, mode_t mode, int attributes, struct wim_dentry **dentry_ret) { struct wim_dentry *parent; struct wim_dentry *new; const char *basename; struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx); int ret; parent = get_parent_dentry(wimfs_ctx->wim, path); if (!parent) return -errno; if (!dentry_is_directory(parent)) return -ENOTDIR; basename = path_basename(path); if (get_dentry_child_with_name(parent, basename)) return -EEXIST; ret = new_dentry_with_inode(basename, &new); if (ret) return -ENOMEM; new->d_inode->i_resolved = 1; new->d_inode->i_ino = wimfs_ctx->next_ino++; new->d_inode->i_attributes = attributes; if (wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA) { if (inode_set_unix_data(new->d_inode, fuse_ctx->uid, fuse_ctx->gid, mode & ~fuse_ctx->umask, wimfs_ctx->wim->lookup_table, UNIX_DATA_ALL | UNIX_DATA_CREATE)) { free_dentry(new); return -ENOMEM; } } dentry_add_child(parent, new); hlist_add_head(&new->d_inode->i_hlist, wimfs_ctx->image_inode_list); if (dentry_ret) *dentry_ret = new; return 0; } /* Remove a dentry from a mounted WIM image; i.e. remove an alias for the * corresponding inode. * * If there are no remaining references to the inode either through dentries or * open file descriptors, the inode is freed. Otherwise, the inode is not * removed, but the dentry is unlinked and freed. * * Either way, all lookup table entries referenced by the inode have their * reference count decremented. If a lookup table entry has no open file * descriptors and no references remaining, it is freed, and the corresponding * staging file is unlinked. */ static void remove_dentry(struct wim_dentry *dentry, struct wim_lookup_table *lookup_table) { struct wim_inode *inode = dentry->d_inode; struct wim_lookup_table_entry *lte; unsigned i; for (i = 0; i <= inode->i_num_ads; i++) { lte = inode_stream_lte_resolved(inode, i); if (lte) lte_decrement_refcnt(lte, lookup_table); } unlink_dentry(dentry); put_dentry(dentry); } static mode_t inode_default_unix_mode(const struct wim_inode *inode) { if (inode_is_symlink(inode)) return S_IFLNK | 0777; else if (inode_is_directory(inode)) return S_IFDIR | 0777; else return S_IFREG | 0777; } /* Transfers file attributes from a struct wim_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 wim_inode *inode, const struct wim_lookup_table_entry *lte, struct stat *stbuf) { const struct wimfs_context *ctx = wimfs_get_context(); memset(stbuf, 0, sizeof(struct stat)); stbuf->st_mode = inode_default_unix_mode(inode); stbuf->st_uid = ctx->default_uid; stbuf->st_gid = ctx->default_gid; if (ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA) { struct wimlib_unix_data unix_data; if (inode_get_unix_data(inode, &unix_data, NULL) == 0) { stbuf->st_uid = unix_data.uid; stbuf->st_gid = unix_data.gid; stbuf->st_mode = unix_data.mode; } } stbuf->st_ino = (ino_t)inode->i_ino; stbuf->st_nlink = inode->i_nlink; if (lte) stbuf->st_size = wim_resource_size(lte); else stbuf->st_size = 0; #ifdef HAVE_STAT_NANOSECOND_PRECISION stbuf->st_atim = wim_timestamp_to_timespec(inode->i_last_access_time); stbuf->st_mtim = wim_timestamp_to_timespec(inode->i_last_write_time); stbuf->st_ctim = stbuf->st_mtim; #else stbuf->st_atime = wim_timestamp_to_unix(inode->i_last_access_time); stbuf->st_mtime = wim_timestamp_to_unix(inode->i_last_write_time); stbuf->st_ctime = stbuf->st_mtime; #endif stbuf->st_blocks = (stbuf->st_size + 511) / 512; return 0; } static void touch_inode(struct wim_inode *inode) { u64 now = get_wim_timestamp(); inode->i_last_access_time = now; inode->i_last_write_time = now; } /* Creates a new staging file and returns its file descriptor opened for * writing. * * @name_ret: A location into which the a pointer to the newly allocated name of * the staging file is stored. * * @ctx: Context for the WIM filesystem; this provides the name of the * staging directory. * * On success, returns the file descriptor for the staging file, opened for * writing. On failure, returns -1 and sets errno. */ static int create_staging_file(char **name_ret, struct wimfs_context *ctx) { size_t name_len; char *name; struct stat stbuf; int fd; int errno_save; static const size_t STAGING_FILE_NAME_LEN = 20; name_len = ctx->staging_dir_name_len + 1 + STAGING_FILE_NAME_LEN; name = MALLOC(name_len + 1); if (!name) { errno = ENOMEM; return -1; } do { memcpy(name, ctx->staging_dir_name, ctx->staging_dir_name_len); name[ctx->staging_dir_name_len] = '/'; randomize_char_array_with_alnum(name + ctx->staging_dir_name_len + 1, STAGING_FILE_NAME_LEN); name[name_len] = '\0'; /* Just in case, verify that the randomly generated name doesn't name an * existing file, and try again if so */ } while (stat(name, &stbuf) == 0); if (errno != ENOENT) /* other error?! */ return -1; /* doesn't exist--- ok */ DEBUG("Creating staging file `%s'", name); fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0600); if (fd == -1) { errno_save = errno; FREE(name); errno = errno_save; } else { *name_ret = name; } return fd; } /* * Extract a WIM resource to the staging directory. * * @inode: Inode that contains the stream we are extracting * * @stream_id: Identifier for the stream (it stays constant even if the indices * of the stream entries are changed) * * @lte: Pointer to pointer to the lookup table entry for the stream we need to * 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). 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 wim_inode *inode, u32 stream_id, struct wim_lookup_table_entry **lte, off_t size, struct wimfs_context *ctx) { char *staging_file_name; int ret; int fd; struct wim_lookup_table_entry *old_lte, *new_lte; off_t extract_size; DEBUG("Extracting resource to staging dir: inode %"PRIu64", " "stream id %"PRIu32, inode->i_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, ctx); if (fd == -1) return -errno; /* 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; else ret = -EIO; close(fd); 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->i_nlink == 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. */ 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 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->i_nlink); DEBUG("Splitting lookup table entry " "(inode->i_nlink = %u, old_lte->refcnt = %u)", inode->i_nlink, old_lte->refcnt); } new_lte = new_lookup_table_entry(); if (!new_lte) { ret = -ENOMEM; goto out_delete_staging_file; } /* There may already be open file descriptors to this stream if * it's previously been opened read-only, but just now we're * opening it read-write. Identify those file descriptors and * change their lookup table entry pointers to point to the new * lookup table entry, and open staging file descriptors for * them. * * At the same time, we need to count the number of these opened * file descriptors to the new lookup table entry. If there's * an old lookup table entry, this number needs to be subtracted * from the fd's opened to the old entry. */ for (u16 i = 0, j = 0; j < inode->i_num_opened_fds; i++) { struct wimfs_fd *fd = inode->i_fds[i]; if (fd) { if (fd->stream_id == stream_id) { wimlib_assert(fd->f_lte == old_lte); wimlib_assert(fd->staging_fd == -1); fd->f_lte = new_lte; new_lte->num_opened_fds++; fd->staging_fd = open(staging_file_name, O_RDONLY); if (fd->staging_fd == -1) { ret = -errno; goto out_revert_fd_changes; } } j++; } } DEBUG("%hu fd's were already opened to the file we extracted", new_lte->num_opened_fds); if (old_lte) { old_lte->num_opened_fds -= new_lte->num_opened_fds; old_lte->refcnt -= inode->i_nlink; } } new_lte->refcnt = inode->i_nlink; new_lte->resource_location = RESOURCE_IN_STAGING_FILE; new_lte->staging_file_name = staging_file_name; new_lte->lte_inode = inode; if (stream_id == 0) inode->i_lte = new_lte; else for (u16 i = 0; i < inode->i_num_ads; i++) if (inode->i_ads_entries[i].stream_id == stream_id) inode->i_ads_entries[i].lte = new_lte; lookup_table_insert_unhashed(ctx->wim->lookup_table, new_lte); list_add_tail(&new_lte->staging_list, &ctx->staging_list); *lte = new_lte; return 0; out_revert_fd_changes: for (u16 i = 0, j = 0; j < new_lte->num_opened_fds; i++) { struct wimfs_fd *fd = inode->i_fds[i]; if (fd && fd->stream_id == stream_id && fd->f_lte == new_lte) { fd->f_lte = old_lte; if (fd->staging_fd != -1) { close(fd->staging_fd); fd->staging_fd = -1; } j++; } } free_lookup_table_entry(new_lte); out_delete_staging_file: unlink(staging_file_name); FREE(staging_file_name); return ret; } /* * 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 const size_t random_suffix_len = 10; static const char *common_suffix = ".staging"; static const size_t common_suffix_len = 8; char *staging_dir_name = NULL; size_t staging_dir_name_len; size_t prefix_len; const char *wim_basename; char *real_user_prefix = NULL; int ret; if (user_prefix) { real_user_prefix = realpath(user_prefix, NULL); if (!real_user_prefix) { ERROR_WITH_ERRNO("Could not resolve `%s'", real_user_prefix); ret = WIMLIB_ERR_NOTDIR; goto out; } wim_basename = path_basename(ctx->wim->filename); prefix_len = strlen(real_user_prefix) + 1 + strlen(wim_basename); } else { prefix_len = strlen(ctx->wim->filename); } staging_dir_name_len = prefix_len + common_suffix_len + random_suffix_len; staging_dir_name = MALLOC(staging_dir_name_len + 1); if (!staging_dir_name) { ret = WIMLIB_ERR_NOMEM; goto out; } if (real_user_prefix) sprintf(staging_dir_name, "%s/%s", real_user_prefix, wim_basename); else strcpy(staging_dir_name, ctx->wim->filename); strcat(staging_dir_name, common_suffix); randomize_char_array_with_alnum(staging_dir_name + prefix_len + common_suffix_len, random_suffix_len); staging_dir_name[staging_dir_name_len] = '\0'; if (mkdir(staging_dir_name, 0700) != 0) { ERROR_WITH_ERRNO("Failed to create temporary directory `%s'", staging_dir_name); ret = WIMLIB_ERR_MKDIR; } else { ret = 0; } out: FREE(real_user_prefix); if (ret == 0) { ctx->staging_dir_name = staging_dir_name; ctx->staging_dir_name_len = staging_dir_name_len; } else { FREE(staging_dir_name); } return ret; } static int remove_file_or_directory(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { if (remove(fpath) == 0) return 0; else { ERROR_WITH_ERRNO("Cannot remove `%s'", fpath); return WIMLIB_ERR_DELETE_STAGING_DIR; } } /* * Deletes the staging directory and all the files contained in it. */ static int delete_staging_dir(struct wimfs_context *ctx) { int ret; ret = nftw(ctx->staging_dir_name, remove_file_or_directory, 10, FTW_DEPTH); FREE(ctx->staging_dir_name); ctx->staging_dir_name = NULL; return ret; } static void inode_update_lte_ptr(struct wim_inode *inode, struct wim_lookup_table_entry *old_lte, struct wim_lookup_table_entry *new_lte) { if (inode->i_lte == old_lte) { inode->i_lte = new_lte; } else { for (unsigned i = 0; i < inode->i_num_ads; i++) { if (inode->i_ads_entries[i].lte == old_lte) { inode->i_ads_entries[i].lte = new_lte; break; } } } } static void free_lte_if_unneeded(struct wim_lookup_table_entry *lte) { if (wim_resource_size(lte) == 0) { /* Zero-length stream. No lookup table entry needed. */ inode_update_lte_ptr(lte->lte_inode, lte, NULL); free_lookup_table_entry(lte); } } static int inode_close_fds(struct wim_inode *inode) { u16 num_opened_fds = inode->i_num_opened_fds; for (u16 i = 0, j = 0; j < num_opened_fds; i++) { struct wimfs_fd *fd = inode->i_fds[i]; if (fd) { wimlib_assert(fd->f_inode == inode); int ret = close_wimfs_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 wim_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("Freeing entries for zero-length streams"); list_for_each_entry_safe(lte, tmp, &ctx->staging_list, staging_list) free_lte_if_unneeded(lte); xml_update_image_info(w, w->current_image); list_splice(&ctx->staging_list, &w->image_metadata[w->current_image - 1].unhashed_streams); 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) { size_t len = strlen(s1) + strlen(s2); if (len > max_len) len = max_len; char *p = MALLOC(len + 1); if (!p) return NULL; snprintf(p, len + 1, "%s%s", s1, s2); return p; } static int set_message_queue_names(struct wimfs_context *ctx, const char *mount_dir) { static const char *u2d_prefix = "/wimlib-unmount-to-daemon-mq"; static const char *d2u_prefix = "/wimlib-daemon-to-unmount-mq"; char *dir_path; char *p; int ret; dir_path = realpath(mount_dir, NULL); if (!dir_path) { ERROR_WITH_ERRNO("Failed to resolve path \"%s\"", mount_dir); if (errno == ENOMEM) return WIMLIB_ERR_NOMEM; else return WIMLIB_ERR_NOTDIR; } for (p = dir_path; *p; p++) if (*p == '/') *p = 0xff; ctx->unmount_to_daemon_mq_name = strcat_dup(u2d_prefix, dir_path, NAME_MAX); if (!ctx->unmount_to_daemon_mq_name) { ret = WIMLIB_ERR_NOMEM; goto out_free_dir_path; } ctx->daemon_to_unmount_mq_name = strcat_dup(d2u_prefix, dir_path, NAME_MAX); if (!ctx->daemon_to_unmount_mq_name) { ret = WIMLIB_ERR_NOMEM; goto out_free_unmount_to_daemon_mq_name; } ret = 0; goto out_free_dir_path; out_free_unmount_to_daemon_mq_name: FREE(ctx->unmount_to_daemon_mq_name); ctx->unmount_to_daemon_mq_name = NULL; out_free_dir_path: FREE(dir_path); return ret; } static void free_message_queue_names(struct wimfs_context *ctx) { FREE(ctx->unmount_to_daemon_mq_name); FREE(ctx->daemon_to_unmount_mq_name); ctx->unmount_to_daemon_mq_name = NULL; ctx->daemon_to_unmount_mq_name = NULL; } /* * 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. * * @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 unmount_to_daemon_mq_flags = O_WRONLY | O_CREAT; int daemon_to_unmount_mq_flags = O_RDONLY | O_CREAT; mode_t mode; mode_t orig_umask; int ret; if (daemon) { swap(unmount_to_daemon_mq_flags, daemon_to_unmount_mq_flags); mode = 0600; } else { mode = 0666; } orig_umask = umask(0000); DEBUG("Opening message queue \"%s\"", ctx->unmount_to_daemon_mq_name); ctx->unmount_to_daemon_mq = mq_open(ctx->unmount_to_daemon_mq_name, unmount_to_daemon_mq_flags, mode, NULL); if (ctx->unmount_to_daemon_mq == (mqd_t)-1) { ERROR_WITH_ERRNO("mq_open()"); ret = WIMLIB_ERR_MQUEUE; goto out; } DEBUG("Opening message queue \"%s\"", ctx->daemon_to_unmount_mq_name); ctx->daemon_to_unmount_mq = mq_open(ctx->daemon_to_unmount_mq_name, daemon_to_unmount_mq_flags, mode, NULL); if (ctx->daemon_to_unmount_mq == (mqd_t)-1) { ERROR_WITH_ERRNO("mq_open()"); mq_close(ctx->unmount_to_daemon_mq); mq_unlink(ctx->unmount_to_daemon_mq_name); ctx->unmount_to_daemon_mq = (mqd_t)-1; ret = WIMLIB_ERR_MQUEUE; goto out; } ret = 0; out: umask(orig_umask); return ret; } /* Try to determine the maximum message size of a message queue. The return * value is the maximum message size, or a guess of 8192 bytes if it cannot be * determined. */ static long mq_get_msgsize(mqd_t mq) { static const char *msgsize_max_file = "/proc/sys/fs/mqueue/msgsize_max"; FILE *fp; struct mq_attr attr; long msgsize; if (mq_getattr(mq, &attr) == 0) { msgsize = attr.mq_msgsize; } else { ERROR_WITH_ERRNO("mq_getattr()"); ERROR("Attempting to read %s", msgsize_max_file); fp = fopen(msgsize_max_file, "rb"); if (fp) { if (fscanf(fp, "%ld", &msgsize) != 1) { ERROR("Assuming message size of 8192"); msgsize = 8192; } fclose(fp); } else { ERROR_WITH_ERRNO("Failed to open the file `%s'", msgsize_max_file); ERROR("Assuming message size of 8192"); msgsize = 8192; } } return msgsize; } static int get_mailbox(mqd_t mq, long needed_msgsize, long *msgsize_ret, void **mailbox_ret) { long msgsize; void *mailbox; msgsize = mq_get_msgsize(mq); if (msgsize < needed_msgsize) { ERROR("Message queue max size must be at least %ld!", needed_msgsize); return WIMLIB_ERR_MQUEUE; } mailbox = MALLOC(msgsize); if (!mailbox) { ERROR("Failed to allocate %ld bytes for mailbox", msgsize); return WIMLIB_ERR_NOMEM; } *msgsize_ret = msgsize; *mailbox_ret = mailbox; return 0; } static void unlink_message_queues(struct wimfs_context *ctx) { mq_unlink(ctx->unmount_to_daemon_mq_name); mq_unlink(ctx->daemon_to_unmount_mq_name); } /* 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); ctx->daemon_to_unmount_mq = (mqd_t)(-1); unlink_message_queues(ctx); } 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_hdr { int timeout_seconds; }; struct unmount_msg_handler_context { struct msg_handler_context_hdr hdr; pid_t daemon_pid; int mount_flags; int status; wimlib_progress_func_t progress_func; }; struct daemon_msg_handler_context { struct msg_handler_context_hdr hdr; struct wimfs_context *wimfs_ctx; }; static int send_unmount_request_msg(mqd_t mq, int unmount_flags, u8 want_progress_messages) { DEBUG("Sending unmount request msg"); struct msg_unmount_request msg = { .hdr = { .min_version = WIMLIB_MAKEVERSION(1, 2, 1), .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 send_daemon_info_msg(mqd_t mq, pid_t pid, int mount_flags) { 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, 1), .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, 1), .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, 1), .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 progress information " "to unmount process"); } } return 0; } static int msg_unmount_request_handler(const void *_msg, void *_handler_ctx) { const struct msg_unmount_request *msg = _msg; struct daemon_msg_handler_context *handler_ctx = _handler_ctx; struct wimfs_context *wimfs_ctx; int status = 0; int ret; int unmount_flags; wimlib_progress_func_t progress_func; DEBUG("Handling unmount request msg"); wimfs_ctx = handler_ctx->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 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; } } wimfs_ctx->status = status; wimfs_ctx->have_status = true; return MSG_BREAK_LOOP; } static int msg_daemon_info_handler(const void *_msg, void *_handler_ctx) { const struct msg_daemon_info *msg = _msg; struct unmount_msg_handler_context *handler_ctx = _handler_ctx; DEBUG("Handling daemon info msg"); if (msg->hdr.msg_size < sizeof(*msg)) return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE; handler_ctx->daemon_pid = msg->daemon_pid; handler_ctx->mount_flags = msg->mount_flags; handler_ctx->hdr.timeout_seconds = 1; DEBUG("pid of daemon is %d; mount flags were %#x", handler_ctx->daemon_pid, handler_ctx->mount_flags); return 0; } static int msg_write_streams_progress_handler(const void *_msg, void *_handler_ctx) { const struct msg_write_streams_progress *msg = _msg; struct unmount_msg_handler_context *handler_ctx = _handler_ctx; if (msg->hdr.msg_size < sizeof(*msg)) return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE; if (handler_ctx->progress_func) { handler_ctx->progress_func(WIMLIB_PROGRESS_MSG_WRITE_STREAMS, &msg->info); } return 0; } static int msg_unmount_finished_handler(const void *_msg, void *_handler_ctx) { const struct msg_unmount_finished *msg = _msg; struct unmount_msg_handler_context *handler_ctx = _handler_ctx; DEBUG("Handling unmount finished message"); if (msg->hdr.msg_size < sizeof(*msg)) return WIMLIB_ERR_INVALID_UNMOUNT_MESSAGE; handler_ctx->status = msg->status; DEBUG("status is %d", handler_ctx->status); return MSG_BREAK_LOOP; } static int unmount_timed_out_cb(void *_handler_ctx) { struct unmount_msg_handler_context *handler_ctx = _handler_ctx; if (handler_ctx->daemon_pid == 0) { goto out_crashed; } else { kill(handler_ctx->daemon_pid, 0); if (errno == ESRCH) { goto out_crashed; } else { DEBUG("Filesystem daemon is still alive... " "Waiting another %d seconds\n", handler_ctx->hdr.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 daemon_timed_out_cb(void *_handler_ctx) { ERROR("Timed out waiting for unmount request! " "Changes to the mounted WIM will not be committed."); return WIMLIB_ERR_TIMEOUT; } typedef int (*msg_handler_t)(const void *_msg, void *_handler_ctx); struct msg_handler_callbacks { int (*timed_out)(void * _handler_ctx); 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_hdr *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; gettimeofday(&now, NULL); timeout.tv_sec = now.tv_sec + handler_ctx->timeout_seconds; timeout.tv_nsec = now.tv_usec * 1000; 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_hdr *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; } /* 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; 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); } /* Parent */ ret = waitpid(pid, &status, 0); if (ret == -1) { ERROR_WITH_ERRNO("Failed to wait for fusermount process to " "terminate"); return WIMLIB_ERR_FUSERMOUNT; } if (!WIFEXITED(status)) { ERROR("'fusermount' did not terminate normally!"); return WIMLIB_ERR_FUSERMOUNT; } status = WEXITSTATUS(status); if (status == 0) return 0; if (status != WIMLIB_ERR_FUSERMOUNT) return WIMLIB_ERR_FUSERMOUNT; /* 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. */ ERROR("Falling back to 'umount'. Note: you may need to be " "root for this to work"); 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 = waitpid(pid, &status, 0); if (ret == -1) { ERROR_WITH_ERRNO("Failed to wait for `umount' process to " "terminate"); return WIMLIB_ERR_FUSERMOUNT; } if (status != 0) { ERROR("`umount' did not successfully complete"); return WIMLIB_ERR_FUSERMOUNT; } return 0; } #if 0 static int wimfs_access(const char *path, int mask) { return -ENOSYS; } #endif static int wimfs_chmod(const char *path, mode_t mask) { struct wim_dentry *dentry; struct wimfs_context *ctx = wimfs_get_context(); int ret; if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA)) return -EPERM; ret = lookup_resource(ctx->wim, path, LOOKUP_FLAG_DIRECTORY_OK, &dentry, NULL, NULL); if (ret) return ret; ret = inode_set_unix_data(dentry->d_inode, ctx->default_uid, ctx->default_gid, mask, ctx->wim->lookup_table, UNIX_DATA_MODE); return ret ? -ENOMEM : 0; } static int wimfs_chown(const char *path, uid_t uid, gid_t gid) { struct wim_dentry *dentry; struct wimfs_context *ctx = wimfs_get_context(); int ret; if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_UNIX_DATA)) return -EPERM; ret = lookup_resource(ctx->wim, path, LOOKUP_FLAG_DIRECTORY_OK, &dentry, NULL, NULL); if (ret) return ret; ret = inode_set_unix_data(dentry->d_inode, uid, gid, inode_default_unix_mode(dentry->d_inode), ctx->wim->lookup_table, UNIX_DATA_UID | UNIX_DATA_GID); return ret ? -ENOMEM : 0; } /* Called when the filesystem is unmounted. */ static void wimfs_destroy(void *p) { struct wimfs_context *wimfs_ctx = wimfs_get_context(); if (open_message_queues(wimfs_ctx, true) == 0) { struct daemon_msg_handler_context handler_ctx = { .hdr = { .timeout_seconds = 5, }, .wimfs_ctx = wimfs_ctx, }; message_loop(wimfs_ctx->unmount_to_daemon_mq, &daemon_msg_handler_callbacks, &handler_ctx.hdr); } } #if 0 static int wimfs_fallocate(const char *path, int mode, off_t offset, off_t len, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; wimlib_assert(fd->staging_fd != -1); return fallocate(fd->staging_fd, mode, offset, len); } #endif static int wimfs_fgetattr(const char *path, struct stat *stbuf, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; return inode_to_stbuf(fd->f_inode, fd->f_lte, stbuf); } static int wimfs_ftruncate(const char *path, off_t size, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; int ret = ftruncate(fd->staging_fd, size); if (ret) return -errno; touch_inode(fd->f_inode); fd->f_lte->resource_entry.original_size = size; return 0; } /* * Fills in a `struct stat' that corresponds to a file or directory in the WIM. */ static int wimfs_getattr(const char *path, struct stat *stbuf) { struct wim_dentry *dentry; struct wim_lookup_table_entry *lte; int ret; struct wimfs_context *ctx = wimfs_get_context(); ret = lookup_resource(ctx->wim, path, get_lookup_flags(ctx) | LOOKUP_FLAG_DIRECTORY_OK, &dentry, <e, NULL); if (ret != 0) return ret; return inode_to_stbuf(dentry->d_inode, lte, stbuf); } #ifdef ENABLE_XATTR /* Read an alternate data stream through the XATTR interface, or get its size */ static int wimfs_getxattr(const char *path, const char *name, char *value, size_t size) { int ret; struct wim_inode *inode; struct wim_ads_entry *ads_entry; size_t res_size; struct wim_lookup_table_entry *lte; struct wimfs_context *ctx = wimfs_get_context(); if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) return -ENOTSUP; if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) return -ENOATTR; name += 5; inode = wim_pathname_to_inode(ctx->wim, path); if (!inode) return -errno; ads_entry = inode_get_ads_entry(inode, name, NULL); if (!ads_entry) return -ENOATTR; lte = ads_entry->lte; res_size = wim_resource_size(lte); if (size == 0) return res_size; if (res_size > size) return -ERANGE; ret = read_full_resource_into_buf(lte, value, true); if (ret != 0) return -EIO; return res_size; } #endif /* Create a hard link */ static int wimfs_link(const char *to, const char *from) { struct wim_dentry *from_dentry, *from_dentry_parent; const char *link_name; struct wim_inode *inode; struct wim_lookup_table_entry *lte; WIMStruct *w = wimfs_get_WIMStruct(); u16 i; int ret; inode = wim_pathname_to_inode(w, to); if (!inode) return -errno; if (inode->i_attributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT)) return -EPERM; from_dentry_parent = get_parent_dentry(w, from); if (!from_dentry_parent) return -errno; if (!dentry_is_directory(from_dentry_parent)) return -ENOTDIR; link_name = path_basename(from); if (get_dentry_child_with_name(from_dentry_parent, link_name)) return -EEXIST; ret = new_dentry(link_name, &from_dentry); if (ret) return -ENOMEM; inode_add_dentry(from_dentry, inode); from_dentry->d_inode = inode; inode->i_nlink++; for (i = 0; i <= inode->i_num_ads; i++) { lte = inode_stream_lte_resolved(inode, i); if (lte) lte->refcnt++; } dentry_add_child(from_dentry_parent, from_dentry); return 0; } #ifdef ENABLE_XATTR static int wimfs_listxattr(const char *path, char *list, size_t size) { size_t needed_size; struct wim_inode *inode; struct wimfs_context *ctx = wimfs_get_context(); u16 i; char *p; bool size_only = (size == 0); if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) return -ENOTSUP; /* List alternate data streams, or get the list size */ inode = wim_pathname_to_inode(ctx->wim, path); if (!inode) return -errno; p = list; for (i = 0; i < inode->i_num_ads; i++) { char *stream_name_mbs; size_t stream_name_mbs_nbytes; int ret; ret = utf16le_to_tstr(inode->i_ads_entries[i].stream_name, inode->i_ads_entries[i].stream_name_nbytes, &stream_name_mbs, &stream_name_mbs_nbytes); if (ret) return -errno; needed_size = stream_name_mbs_nbytes + 6; if (!size_only) { if (needed_size > size) { FREE(stream_name_mbs); return -ERANGE; } sprintf(p, "user.%s", stream_name_mbs); size -= needed_size; } p += needed_size; FREE(stream_name_mbs); } return p - list; } #endif /* Create a directory in the WIM image. */ static int wimfs_mkdir(const char *path, mode_t mode) { return create_dentry(fuse_get_context(), path, mode | S_IFDIR, FILE_ATTRIBUTE_DIRECTORY, NULL); } /* Create a regular file or alternate data stream in the WIM image. */ static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev) { const char *stream_name; struct fuse_context *fuse_ctx = fuse_get_context(); struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx); if (!S_ISREG(mode)) return -EPERM; if ((wimfs_ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS) && (stream_name = path_stream_name(path))) { /* Make an alternate data stream */ struct wim_ads_entry *new_entry; struct wim_inode *inode; char *p = (char*)stream_name - 1; wimlib_assert(*p == ':'); *p = '\0'; inode = wim_pathname_to_inode(wimfs_ctx->wim, path); if (!inode) return -errno; if (inode->i_attributes & FILE_ATTRIBUTE_REPARSE_POINT) 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 { /* Make a normal file (not an alternate data stream) */ return create_dentry(fuse_ctx, path, mode | S_IFREG, FILE_ATTRIBUTE_NORMAL, NULL); } } /* Open a file. */ static int wimfs_open(const char *path, struct fuse_file_info *fi) { struct wim_dentry *dentry; struct wim_lookup_table_entry *lte; int ret; struct wimfs_fd *fd; struct wim_inode *inode; u16 stream_idx; u32 stream_id; struct wimfs_context *ctx = wimfs_get_context(); ret = lookup_resource(ctx->wim, path, get_lookup_flags(ctx), &dentry, <e, &stream_idx); if (ret != 0) return ret; inode = dentry->d_inode; if (stream_idx == 0) stream_id = 0; else stream_id = inode->i_ads_entries[stream_idx - 1].stream_id; /* The file resource may be in the staging directory (read-write mounts * only) or in the WIM. If it's in the staging directory, we need to * open a native file descriptor for the corresponding file. Otherwise, * we can read the file resource directly from the WIM file if we are * opening it read-only, but we need to extract the resource to the * staging directory if we are opening it writable. */ if (flags_writable(fi->flags) && (!lte || lte->resource_location != RESOURCE_IN_STAGING_FILE)) { u64 size = (lte) ? wim_resource_size(lte) : 0; ret = extract_resource_to_staging_dir(inode, stream_id, <e, size, ctx); if (ret != 0) return ret; } ret = alloc_wimfs_fd(inode, stream_id, lte, &fd, wimfs_ctx_readonly(ctx)); if (ret != 0) return ret; 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_wimfs_fd(fd); return -errno_save; } } fi->fh = (uintptr_t)fd; return 0; } /* Opens a directory. */ static int wimfs_opendir(const char *path, struct fuse_file_info *fi) { struct wim_inode *inode; int ret; struct wimfs_fd *fd = NULL; struct wimfs_context *ctx = wimfs_get_context(); WIMStruct *w = ctx->wim; inode = wim_pathname_to_inode(w, path); if (!inode) return -errno; if (!inode_is_directory(inode)) return -ENOTDIR; ret = alloc_wimfs_fd(inode, 0, NULL, &fd, wimfs_ctx_readonly(ctx)); fi->fh = (uintptr_t)fd; return ret; } /* * Read data from a file in the WIM or in the staging directory. */ static int wimfs_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; ssize_t ret; u64 res_size; if (!fd) return -EBADF; if (!fd->f_lte) /* Empty stream with no lookup table entry */ return 0; res_size = wim_resource_size(fd->f_lte); if (offset > res_size) return -EOVERFLOW; size = min(size, INT_MAX); size = min(size, res_size - offset); switch (fd->f_lte->resource_location) { case RESOURCE_IN_STAGING_FILE: ret = pread(fd->staging_fd, buf, size, offset); if (ret < 0) ret = -errno; break; case RESOURCE_IN_WIM: if (read_partial_wim_resource_into_buf(fd->f_lte, size, offset, buf, true)) ret = -errno; ret = size; break; case RESOURCE_IN_ATTACHED_BUFFER: memcpy(buf, fd->f_lte->attached_buffer + offset, size); ret = size; break; default: ERROR("Invalid resource location"); ret = -EIO; break; } return ret; } struct fill_params { void *buf; fuse_fill_dir_t filler; }; static int dentry_fuse_fill(struct wim_dentry *dentry, void *arg) { struct fill_params *fill_params = arg; char *file_name_mbs; size_t file_name_mbs_nbytes; int ret; ret = utf16le_to_tstr(dentry->file_name, dentry->file_name_nbytes, &file_name_mbs, &file_name_mbs_nbytes); if (ret) return -errno; ret = fill_params->filler(fill_params->buf, file_name_mbs, NULL, 0); FREE(file_name_mbs); return ret; } /* Fills in the entries of the directory specified by @path using the * FUSE-provided function @filler. */ static int wimfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; struct wim_inode *inode; if (!fd) return -EBADF; inode = fd->f_inode; struct fill_params fill_params = { .buf = buf, .filler = filler, }; filler(buf, ".", NULL, 0); filler(buf, "..", NULL, 0); return for_dentry_in_rbtree(inode->i_children.rb_node, dentry_fuse_fill, &fill_params); } static int wimfs_readlink(const char *path, char *buf, size_t buf_len) { struct wimfs_context *ctx = wimfs_get_context(); struct wim_inode *inode = wim_pathname_to_inode(ctx->wim, path); int ret; if (!inode) return -errno; if (!inode_is_symlink(inode)) return -EINVAL; ret = inode_readlink(inode, buf, buf_len, ctx->wim, true); if (ret > 0) ret = 0; return ret; } /* Close a file. */ static int wimfs_release(const char *path, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; return close_wimfs_fd(fd); } /* Close a directory */ static int wimfs_releasedir(const char *path, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; return close_wimfs_fd(fd); } #ifdef ENABLE_XATTR /* Remove an alternate data stream through the XATTR interface */ static int wimfs_removexattr(const char *path, const char *name) { struct wim_inode *inode; struct wim_ads_entry *ads_entry; u16 ads_idx; struct wimfs_context *ctx = wimfs_get_context(); if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) return -ENOTSUP; if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) return -ENOATTR; name += 5; inode = wim_pathname_to_inode(ctx->wim, path); if (!inode) return -errno; ads_entry = inode_get_ads_entry(inode, name, &ads_idx); if (!ads_entry) return -ENOATTR; inode_remove_ads(inode, ads_idx, ctx->wim->lookup_table); return 0; } #endif /* Renames a file or directory. See rename (3) */ static int wimfs_rename(const char *from, const char *to) { struct wim_dentry *src; struct wim_dentry *dst; struct wim_dentry *parent_of_dst; WIMStruct *w = wimfs_get_WIMStruct(); int ret; /* This rename() implementation currently only supports actual files * (not alternate data streams) */ src = get_dentry(w, from); if (!src) return -errno; dst = get_dentry(w, to); if (dst) { /* Destination file exists */ if (src == dst) /* Same file */ return 0; if (!dentry_is_directory(src)) { /* Cannot rename non-directory to directory. */ if (dentry_is_directory(dst)) return -EISDIR; } else { /* Cannot rename directory to a non-directory or a non-empty * directory */ if (!dentry_is_directory(dst)) return -ENOTDIR; if (inode_has_children(dst->d_inode)) return -ENOTEMPTY; } parent_of_dst = dst->parent; } else { /* Destination does not exist */ parent_of_dst = get_parent_dentry(w, to); if (!parent_of_dst) return -errno; if (!dentry_is_directory(parent_of_dst)) return -ENOTDIR; } ret = set_dentry_name(src, path_basename(to)); if (ret != 0) return -ENOMEM; if (dst) remove_dentry(dst, w->lookup_table); unlink_dentry(src); dentry_add_child(parent_of_dst, src); return 0; } /* Remove a directory */ static int wimfs_rmdir(const char *path) { struct wim_dentry *dentry; WIMStruct *w = wimfs_get_WIMStruct(); dentry = get_dentry(w, path); if (!dentry) return -errno; if (!dentry_is_directory(dentry)) return -ENOTDIR; if (dentry_has_children(dentry)) return -ENOTEMPTY; remove_dentry(dentry, w->lookup_table); return 0; } #ifdef ENABLE_XATTR /* Write an alternate data stream through the XATTR interface */ static int wimfs_setxattr(const char *path, const char *name, const char *value, size_t size, int flags) { struct wim_ads_entry *existing_ads_entry; struct wim_inode *inode; u16 ads_idx; struct wimfs_context *ctx = wimfs_get_context(); int ret; if (!(ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR)) return -ENOTSUP; if (strlen(name) < 5 || memcmp(name, "user.", 5) != 0) return -ENOATTR; name += 5; inode = wim_pathname_to_inode(ctx->wim, path); if (!inode) return -errno; existing_ads_entry = inode_get_ads_entry(inode, name, &ads_idx); if (existing_ads_entry) { if (flags & XATTR_CREATE) return -EEXIST; } else { if (flags & XATTR_REPLACE) return -ENOATTR; } ret = inode_add_ads_with_data(inode, name, value, size, ctx->wim->lookup_table); if (ret == 0) { if (existing_ads_entry) inode_remove_ads(inode, ads_idx, ctx->wim->lookup_table); } else { ret = -ENOMEM; } return ret; } #endif static int wimfs_symlink(const char *to, const char *from) { struct fuse_context *fuse_ctx = fuse_get_context(); struct wimfs_context *wimfs_ctx = WIMFS_CTX(fuse_ctx); struct wim_dentry *dentry; int ret; ret = create_dentry(fuse_ctx, from, S_IFLNK | 0777, FILE_ATTRIBUTE_REPARSE_POINT, &dentry); if (ret == 0) { dentry->d_inode->i_reparse_tag = WIM_IO_REPARSE_TAG_SYMLINK; if (inode_set_symlink(dentry->d_inode, to, wimfs_ctx->wim->lookup_table, NULL)) { remove_dentry(dentry, wimfs_ctx->wim->lookup_table); ret = -ENOMEM; } } return ret; } /* Reduce the size of a file */ static int wimfs_truncate(const char *path, off_t size) { struct wim_dentry *dentry; struct wim_lookup_table_entry *lte; int ret; u16 stream_idx; u32 stream_id; struct wim_inode *inode; struct wimfs_context *ctx = wimfs_get_context(); ret = lookup_resource(ctx->wim, path, get_lookup_flags(ctx), &dentry, <e, &stream_idx); if (ret != 0) return ret; if (lte == NULL && size == 0) return 0; inode = dentry->d_inode; if (stream_idx == 0) stream_id = 0; else stream_id = inode->i_ads_entries[stream_idx - 1].stream_id; if (lte->resource_location == RESOURCE_IN_STAGING_FILE) { ret = truncate(lte->staging_file_name, size); if (ret != 0) ret = -errno; } else { /* 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, <e, size, ctx); } if (ret == 0) lte->resource_entry.original_size = size; return ret; } /* Unlink a non-directory or alternate data stream */ static int wimfs_unlink(const char *path) { struct wim_dentry *dentry; struct wim_lookup_table_entry *lte; int ret; u16 stream_idx; struct wimfs_context *ctx = wimfs_get_context(); ret = lookup_resource(ctx->wim, path, get_lookup_flags(ctx), &dentry, <e, &stream_idx); if (ret != 0) return ret; if (stream_idx == 0) remove_dentry(dentry, ctx->wim->lookup_table); else inode_remove_ads(dentry->d_inode, stream_idx - 1, ctx->wim->lookup_table); return 0; } #ifdef HAVE_UTIMENSAT /* * Change the timestamp on a file dentry. * * Note that alternate data streams do not have their own timestamps. */ static int wimfs_utimens(const char *path, const struct timespec tv[2]) { struct wim_dentry *dentry; struct wim_inode *inode; WIMStruct *w = wimfs_get_WIMStruct(); dentry = get_dentry(w, path); if (!dentry) return -errno; inode = dentry->d_inode; if (tv[0].tv_nsec != UTIME_OMIT) { if (tv[0].tv_nsec == UTIME_NOW) inode->i_last_access_time = get_wim_timestamp(); else inode->i_last_access_time = timespec_to_wim_timestamp(tv[0]); } if (tv[1].tv_nsec != UTIME_OMIT) { if (tv[1].tv_nsec == UTIME_NOW) inode->i_last_write_time = get_wim_timestamp(); else inode->i_last_write_time = timespec_to_wim_timestamp(tv[1]); } return 0; } #else /* HAVE_UTIMENSAT */ static int wimfs_utime(const char *path, struct utimbuf *times) { struct wim_dentry *dentry; struct wim_inode *inode; WIMStruct *w = wimfs_get_WIMStruct(); dentry = get_dentry(w, path); if (!dentry) return -errno; inode = dentry->d_inode; inode->i_last_write_time = unix_timestamp_to_wim(times->modtime); inode->i_last_access_time = unix_timestamp_to_wim(times->actime); return 0; } #endif /* !HAVE_UTIMENSAT */ /* Writes to a file in the WIM filesystem. * It may be an alternate data stream, but here we don't even notice because we * just get a lookup table entry. */ static int wimfs_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { struct wimfs_fd *fd = (struct wimfs_fd*)(uintptr_t)fi->fh; int ret; if (!fd) return -EBADF; wimlib_assert(fd->f_lte != NULL); wimlib_assert(fd->f_lte->staging_file_name != NULL); wimlib_assert(fd->staging_fd != -1); wimlib_assert(fd->f_inode != NULL); /* Write the data. */ ret = pwrite(fd->staging_fd, buf, size, offset); if (ret == -1) return -errno; /* Update file size */ if (offset + size > fd->f_lte->resource_entry.original_size) fd->f_lte->resource_entry.original_size = offset + size; /* Update timestamps */ touch_inode(fd->f_inode); return ret; } static struct fuse_operations wimfs_operations = { #if 0 .access = wimfs_access, #endif .chmod = wimfs_chmod, .chown = wimfs_chown, .destroy = wimfs_destroy, #if 0 .fallocate = wimfs_fallocate, #endif .fgetattr = wimfs_fgetattr, .ftruncate = wimfs_ftruncate, .getattr = wimfs_getattr, #ifdef ENABLE_XATTR .getxattr = wimfs_getxattr, #endif .link = wimfs_link, #ifdef ENABLE_XATTR .listxattr = wimfs_listxattr, #endif .mkdir = wimfs_mkdir, .mknod = wimfs_mknod, .open = wimfs_open, .opendir = wimfs_opendir, .read = wimfs_read, .readdir = wimfs_readdir, .readlink = wimfs_readlink, .release = wimfs_release, .releasedir = wimfs_releasedir, #ifdef ENABLE_XATTR .removexattr = wimfs_removexattr, #endif .rename = wimfs_rename, .rmdir = wimfs_rmdir, #ifdef ENABLE_XATTR .setxattr = wimfs_setxattr, #endif .symlink = wimfs_symlink, .truncate = wimfs_truncate, .unlink = wimfs_unlink, #ifdef HAVE_UTIMENSAT .utimens = wimfs_utimens, #else .utime = wimfs_utime, #endif .write = wimfs_write, /* wimfs keeps file descriptor structures (struct wimfs_fd), so there is * no need to have the file path provided on operations such as read() * where only the file descriptor is needed. */ #if FUSE_MAJOR_VERSION > 2 || (FUSE_MAJOR_VERSION == 2 && FUSE_MINOR_VERSION >= 8) .flag_nullpath_ok = 1, #endif #if FUSE_MAJOR_VERSION > 2 || (FUSE_MAJOR_VERSION == 2 && FUSE_MINOR_VERSION >= 9) .flag_nopath = 1, .flag_utime_omit_ok = 1, #endif }; /* Mounts an image from a WIM file. */ WIMLIBAPI int wimlib_mount_image(WIMStruct *wim, int image, const char *dir, int mount_flags, WIMStruct **additional_swms, unsigned num_additional_swms, const char *staging_dir) { int argc; char *argv[16]; int ret; char *dir_copy; struct wim_lookup_table *joined_tab, *wim_tab_save; struct wim_image_metadata *imd; struct wimfs_context ctx; struct hlist_node *cur_node; struct wim_inode *inode; DEBUG("Mount: wim = %p, image = %d, dir = %s, flags = %d, ", wim, image, dir, mount_flags); if (!wim || !dir) return WIMLIB_ERR_INVALID_PARAM; ret = verify_swm_set(wim, additional_swms, num_additional_swms); if (ret != 0) return ret; if ((mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) && (wim->hdr.total_parts != 1)) { ERROR("Cannot mount a split WIM read-write"); return WIMLIB_ERR_SPLIT_UNSUPPORTED; } if (num_additional_swms) { ret = new_joined_lookup_table(wim, additional_swms, num_additional_swms, &joined_tab); if (ret != 0) return ret; wim_tab_save = wim->lookup_table; wim->lookup_table = joined_tab; } if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) { ret = wim_run_full_verifications(wim); if (ret != 0) goto out; } ret = select_wim_image(wim, image); if (ret != 0) goto out; 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()"); ret = WIMLIB_ERR_INVALID_PARAM; goto out; } if (imd->inode_list.first) /* May be unneeded? */ imd->inode_list.first->pprev = &imd->inode_list.first; if (imd->modified) { ERROR("Cannot mount image that was added " "with wimlib_add_image()"); ret = WIMLIB_ERR_INVALID_PARAM; goto out; } if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) { ret = lock_wim(wim, wim->fp); if (ret != 0) goto out; } /* Use default stream interface if one was not specified */ if (!(mount_flags & (WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_NONE | WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR | WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS))) mount_flags |= WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_XATTR; DEBUG("Initializing struct wimfs_context"); init_wimfs_context(&ctx); ctx.wim = wim; ctx.mount_flags = mount_flags; ctx.image_inode_list = &imd->inode_list; ctx.default_uid = getuid(); ctx.default_gid = getgid(); 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_unlock; unlink_message_queues(&ctx); DEBUG("Preparing arguments to fuse_main()"); dir_copy = STRDUP(dir); if (!dir_copy) goto out_free_message_queue_names; argc = 0; argv[argc++] = "imagex"; argv[argc++] = dir_copy; /* disable multi-threaded operation for read-write mounts */ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) argv[argc++] = "-s"; if (mount_flags & WIMLIB_MOUNT_FLAG_DEBUG) argv[argc++] = "-d"; /* * We provide the use_ino option to the FUSE mount because we are going * to assign inode numbers ourselves. */ 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 ",default_permissions" ; argv[argc++] = "-o"; argv[argc++] = optstring; if ((mount_flags & WIMLIB_MOUNT_FLAG_READWRITE)) { /* Read-write mount. Make the staging directory */ ret = make_staging_dir(&ctx, staging_dir); if (ret != 0) goto out_free_dir_copy; } else { /* Read-only mount */ strcat(optstring, ",ro"); } if (mount_flags & WIMLIB_MOUNT_FLAG_ALLOW_OTHER) strcat(optstring, ",allow_other"); argv[argc] = NULL; #ifdef ENABLE_DEBUG { int i; DEBUG("FUSE command line (argc = %d): ", argc); for (i = 0; i < argc; i++) { fputs(argv[i], stdout); putchar(' '); } putchar('\n'); fflush(stdout); } #endif /* Mark dentry tree as modified if read-write mount. */ if (mount_flags & WIMLIB_MOUNT_FLAG_READWRITE) { imd->modified = 1; imd->has_been_mounted_rw = 1; } /* 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 = 1; hlist_for_each_entry(inode, cur_node, &imd->inode_list, i_hlist) { inode_resolve_ltes(inode, wim->lookup_table); inode->i_ino = ctx.next_ino++; } DEBUG("(next_ino = %"PRIu64")", ctx.next_ino); DEBUG("Calling fuse_main()"); ret = fuse_main(argc, argv, &wimfs_operations, &ctx); DEBUG("Returned from fuse_main() (ret = %d)", ret); if (ret) { ret = WIMLIB_ERR_FUSE; } else { if (ctx.have_status) ret = ctx.status; else ret = WIMLIB_ERR_TIMEOUT; } if (ctx.daemon_to_unmount_mq != (mqd_t)(-1)) { send_unmount_finished_msg(ctx.daemon_to_unmount_mq, ret); close_message_queues(&ctx); } /* Try to delete the staging directory if a deletion wasn't yet * attempted due to an earlier error */ if (ctx.staging_dir_name) delete_staging_dir(&ctx); out_free_dir_copy: FREE(dir_copy); out_unlock: wim->wim_locked = 0; out_free_message_queue_names: free_message_queue_names(&ctx); out: if (num_additional_swms) { free_lookup_table(wim->lookup_table); wim->lookup_table = wim_tab_save; } 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) { int ret; struct wimfs_context wimfs_ctx; init_wimfs_context(&wimfs_ctx); ret = set_message_queue_names(&wimfs_ctx, dir); if (ret != 0) goto out; ret = open_message_queues(&wimfs_ctx, false); if (ret != 0) goto out_free_message_queue_names; ret = send_unmount_request_msg(wimfs_ctx.unmount_to_daemon_mq, unmount_flags, progress_func != NULL); if (ret != 0) goto out_close_message_queues; ret = execute_fusermount(dir); if (ret != 0) goto out_close_message_queues; struct unmount_msg_handler_context handler_ctx = { .hdr = { .timeout_seconds = 5, }, .daemon_pid = 0, .progress_func = progress_func, }; ret = message_loop(wimfs_ctx.daemon_to_unmount_mq, &unmount_msg_handler_callbacks, &handler_ctx.hdr); if (ret == 0) ret = handler_ctx.status; out_close_message_queues: close_message_queues(&wimfs_ctx); out_free_message_queue_names: free_message_queue_names(&wimfs_ctx); out: return ret; } #else /* WITH_FUSE */ static int mount_unsupported_error() { #if defined(__WIN32__) ERROR("Sorry-- Mounting WIM images is not supported on Windows!"); #else ERROR("wimlib was compiled with --without-fuse, which disables support " "for mounting WIMs."); #endif return WIMLIB_ERR_UNSUPPORTED; } WIMLIBAPI int wimlib_unmount_image(const tchar *dir, int unmount_flags, wimlib_progress_func_t progress_func) { return mount_unsupported_error(); } WIMLIBAPI int wimlib_mount_image(WIMStruct *wim, int image, const tchar *dir, int mount_flags, WIMStruct **additional_swms, unsigned num_additional_swms, const tchar *staging_dir) { return mount_unsupported_error(); } #endif /* !WITH_FUSE */