+++ /dev/null
-/*
- * mount.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 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
-
-#include "sha1.h"
-#include "lookup_table.h"
-#include "xml.h"
-#include "io.h"
-#include "timestamp.h"
-#include <limits.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/wait.h>
-#define FUSE_USE_VERSION 26
-#include <errno.h>
-#include <string.h>
-#include <sys/time.h>
-#include <fuse.h>
-#include <ftw.h>
-#include <mqueue.h>
-#include <utime.h>
-
-#ifdef ENABLE_XATTR
-#include <attr/xattr.h>
-#endif
-
-/* File descriptor to a file open on the WIM filesystem. */
-struct wimlib_fd {
- struct inode *f_inode;
- struct 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;
-
- /* Next inode number to be assigned. */
- u64 next_ino;
-
- /* List of lookup table entries in the staging directory */
- struct list_head staging_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
- * unmount' command) needs to communicate with the filesystem daemon running
- * fuse_main() (i.e. that spawned 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;
-};
-
-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);
-}
-
-static inline struct wimfs_context *wimfs_get_context()
-{
- return (struct wimfs_context*)fuse_get_context()->private_data;
-}
-
-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)
-{
- if (ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
- return LOOKUP_FLAG_ADS_OK;
- else
- return 0;
-}
-
-/* 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_wimlib_fd(struct inode *inode,
- u32 stream_id,
- struct lookup_table_entry *lte,
- struct wimlib_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 %lx (open = %u, allocated = %u)",
- stream_id, inode->ino, inode->num_opened_fds,
- inode->num_allocated_fds);
-
- if (inode->num_opened_fds == inode->num_allocated_fds) {
- struct wimlib_fd **fds;
- u16 num_new_fds;
-
- if (inode->num_allocated_fds == max_fds) {
- ret = -EMFILE;
- goto out;
- }
- num_new_fds = min(fds_per_alloc,
- max_fds - inode->num_allocated_fds);
-
- fds = REALLOC(inode->fds,
- (inode->num_allocated_fds + num_new_fds) *
- sizeof(inode->fds[0]));
- if (!fds) {
- ret = -ENOMEM;
- goto out;
- }
- memset(&fds[inode->num_allocated_fds], 0,
- num_new_fds * sizeof(fds[0]));
- inode->fds = fds;
- inode->num_allocated_fds += num_new_fds;
- }
- for (u16 i = 0; ; i++) {
- if (!inode->fds[i]) {
- struct wimlib_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->fds[i] = fd;
- inode->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 inode *inode, struct wimlib_fd *fd)
-{
- wimlib_assert(fd != NULL);
- wimlib_assert(inode != NULL);
-
- pthread_mutex_lock(&inode->i_mutex);
-
- wimlib_assert(fd->f_inode == inode);
- wimlib_assert(inode->num_opened_fds != 0);
- wimlib_assert(fd->idx < inode->num_allocated_fds);
- wimlib_assert(inode->fds[fd->idx] == fd);
-
- inode->fds[fd->idx] = NULL;
- FREE(fd);
- if (--inode->num_opened_fds == 0 && inode->link_count == 0) {
- pthread_mutex_unlock(&inode->i_mutex);
- free_inode(inode);
- } else {
- pthread_mutex_unlock(&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 */
- 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_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);
- ret = lte_put_fd(fd->f_lte, fd);
- if (ret != 0)
- return ret;
-
- inode_put_fd(fd->f_inode, fd);
- 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
- * 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 staging file is
- * unlinked.
- */
-static void remove_dentry(struct dentry *dentry,
- struct lookup_table *lookup_table)
-{
- struct inode *inode = dentry->d_inode;
- struct lookup_table_entry *lte;
- unsigned i;
-
- for (i = 0; i <= inode->num_ads; i++) {
- lte = inode_stream_lte_resolved(inode, i);
- if (lte)
- lte_decrement_refcnt(lte, lookup_table);
- }
- unlink_dentry(dentry);
- put_dentry(dentry);
-}
-
-/* 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.
- * @return: The file descriptor for the new file. Returns -1 and sets errno on
- * error, for any reason possible from the creat() function.
- */
-static int create_staging_file(char **name_ret, int open_flags,
- struct wimfs_context *ctx)
-{
- size_t name_len;
- char *name;
- struct stat stbuf;
- int fd;
- int errno_save;
-
- name_len = ctx->staging_dir_name_len + 1 + SHA1_HASH_SIZE;
- 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,
- SHA1_HASH_SIZE);
- 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, open_flags | O_CREAT | O_TRUNC, 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).
- */
-static int extract_resource_to_staging_dir(struct inode *inode,
- u32 stream_id,
- struct lookup_table_entry **lte,
- off_t size,
- struct wimfs_context *ctx)
-{
- char *staging_file_name;
- int ret;
- int fd;
- struct lookup_table_entry *old_lte, *new_lte;
-
- DEBUG("Extracting resource to staging dir: inode %"PRIu64", "
- "stream id %"PRIu32, inode->ino, stream_id);
-
- old_lte = *lte;
- 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
- ret = 0;
- if (ret != 0 || close(fd) != 0) {
- if (errno != 0)
- ret = -errno;
- else
- ret = -EIO;
- close(fd);
- goto out_delete_staging_file;
- }
-
- 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. */
- 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
- * 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();
- 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->num_opened_fds; i++) {
- struct wimlib_fd *fd = inode->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->link_count;
- }
- }
-
- 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;
- new_lte->lte_inode = inode;
- random_hash(new_lte->hash);
-
- if (stream_id == 0)
- inode->lte = new_lte;
- else
- for (u16 i = 0; i < inode->num_ads; i++)
- if (inode->ads_entries[i].stream_id == stream_id)
- inode->ads_entries[i].lte = new_lte;
-
- lookup_table_insert(ctx->wim->lookup_table, new_lte);
- list_add(&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 wimlib_fd *fd = inode->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;
- 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);
- ctx->staging_dir_name = NULL;
- 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);
- return WIMLIB_ERR_NOTDIR;
- }
-
- DEBUG("Using absolute dir_path = `%s'", dir_path);
-
-
- p = dir_path;
- while (*p) {
- if (*p == '/')
- *p = 0xff;
- p++;
- }
-
- 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. (There of course is still a possibility of a collision if one were to
- * unmount two identically named directories simultaneously...)
- *
- * @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);
-
- if (daemon)
- flags = O_RDONLY | O_CREAT;
- else
- flags = O_WRONLY | O_CREAT;
-
- 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);
-
- if (ctx->unmount_to_daemon_mq == (mqd_t)-1) {
- ERROR_WITH_ERRNO("mq_open()");
- ret = WIMLIB_ERR_MQUEUE;
- goto out;
- }
-
- 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);
-
- 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;
- }
- 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;
-}
-
-/* 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,
- char **mailbox_ret)
-{
- long msgsize;
- char *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)
-{
- 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);
-}
-
-static int wimfs_access(const char *path, int mask)
-{
- /* Permissions not implemented */
- return 0;
-}
-
-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;
-
- 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;
- else
- return -EPERM;
-
-}
-
-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;
-
- wimlib_assert(lte->resource_location == RESOURCE_IN_STAGING_FILE);
- wimlib_assert(lte->staging_file_name);
-
- 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;
- 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;
- }
- 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);
- }
- }
- return 0;
-}
-
-static int inode_close_fds(struct inode *inode)
-{
- u16 num_opened_fds = inode->num_opened_fds;
- for (u16 i = 0, j = 0; j < num_opened_fds; i++) {
- struct wimlib_fd *fd = inode->fds[i];
- if (fd) {
- wimlib_assert(fd->f_inode == inode);
- int ret = close_wimlib_fd(fd);
- if (ret != 0)
- return ret;
- j++;
- }
- }
- return 0;
-}
-
-/* Overwrites the WIM file, with changes saved. */
-static int rebuild_wim(struct wimfs_context *ctx, int write_flags)
-{
- int ret;
- struct lookup_table_entry *lte, *tmp;
- WIMStruct *w = ctx->wim;
-
-
- DEBUG("Closing all staging file descriptors.");
- list_for_each_entry_safe(lte, tmp, &ctx->staging_list, staging_list) {
- ret = inode_close_fds(lte->lte_inode);
- if (ret != 0)
- return ret;
- }
-
- DEBUG("Calculating SHA1 checksums for all new staging files.");
- list_for_each_entry_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");
- return ret;
- }
- return ret;
-}
-
-/* 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. */
-
- 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;
-
- if (open_message_queues(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.");
-
- 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];
- }
-
- 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);
-}
-
-#if 0
-static int wimfs_fallocate(const char *path, int mode,
- off_t offset, off_t len, struct fuse_file_info *fi)
-{
- struct wimlib_fd *fd = (struct wimlib_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 wimlib_fd *fd = (struct wimlib_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 wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh;
- int ret = ftruncate(fd->staging_fd, size);
- if (ret != 0)
- return -errno;
- if (fd->f_lte && size < fd->f_lte->resource_entry.original_size)
- 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 dentry *dentry;
- struct 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 inode *inode;
- struct ads_entry *ads_entry;
- size_t res_size;
- struct 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 -ENOENT;
-
- 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_wim_resource(lte, (u8*)value,
- WIMLIB_RESOURCE_FLAG_MULTITHREADED);
- if (ret != 0)
- return -EIO;
-
- return res_size;
-}
-#endif
-
-/* Create a hard link */
-static int wimfs_link(const char *to, const char *from)
-{
- struct dentry *from_dentry, *from_dentry_parent;
- const char *link_name;
- struct inode *inode;
- struct lookup_table_entry *lte;
- WIMStruct *w = wimfs_get_WIMStruct();
-
- inode = wim_pathname_to_inode(w, to);
- if (!inode)
- return -ENOENT;
-
- if (!inode_is_regular_file(inode))
- return -EPERM;
-
- from_dentry_parent = get_parent_dentry(w, from);
- if (!from_dentry_parent)
- return -ENOENT;
- 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;
- from_dentry = new_dentry(link_name);
- 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++) {
- 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 inode *inode;
- struct wimfs_context *ctx = wimfs_get_context();
-
- 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 -ENOENT;
-
- if (size == 0) {
- needed_size = 0;
- for (u16 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++) {
- needed_size = inode->ads_entries[i].stream_name_utf8_len + 6;
- if (needed_size > size)
- return -ERANGE;
- p += sprintf(p, "user.%s",
- inode->ads_entries[i].stream_name_utf8) + 1;
- size -= needed_size;
- }
- return p - list;
- }
-}
-#endif
-
-/*
- * 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;
-
- 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;
-}
-
-/* Creates a regular file. */
-static int wimfs_mknod(const char *path, mode_t mode, dev_t rdev)
-{
- const char *stream_name;
- struct wimfs_context *ctx = wimfs_get_context();
- if ((ctx->mount_flags & WIMLIB_MOUNT_FLAG_STREAM_INTERFACE_WINDOWS)
- && (stream_name = path_stream_name(path))) {
- /* Make an alternate data stream */
- struct ads_entry *new_entry;
- struct inode *inode;
-
- char *p = (char*)stream_name - 1;
- wimlib_assert(*p == ':');
- *p = '\0';
-
- inode = wim_pathname_to_inode(ctx->wim, path);
- if (!inode)
- return -ENOENT;
- if (!inode_is_regular_file(inode))
- 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;
- } else {
- struct dentry *dentry, *parent;
- const char *basename;
-
- /* 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);
- }
- return 0;
-}
-
-
-/* Open a file. */
-static int wimfs_open(const char *path, struct fuse_file_info *fi)
-{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
- int ret;
- struct wimlib_fd *fd;
- struct 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->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_wimlib_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) {
- close_wimlib_fd(fd);
- return -errno;
- }
- }
- fi->fh = (uintptr_t)fd;
- return 0;
-}
-
-/* Opens a directory. */
-static int wimfs_opendir(const char *path, struct fuse_file_info *fi)
-{
- struct inode *inode;
- int ret;
- struct wimlib_fd *fd = NULL;
- struct wimfs_context *ctx = wimfs_get_context();
- WIMStruct *w = ctx->wim;
-
- inode = wim_pathname_to_inode(w, path);
- if (!inode)
- return -ENOENT;
- if (!inode_is_directory(inode))
- return -ENOTDIR;
- ret = alloc_wimlib_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 wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh;
-
- if (!fd)
- return -EBADF;
-
- if (!fd->f_lte) /* Empty stream with no lookup table entry */
- return 0;
-
- if (fd->f_lte->resource_location == RESOURCE_IN_STAGING_FILE) {
- /* Read from staging file */
-
- 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 -errno;
- ret = read(fd->staging_fd, buf, size);
- if (ret == -1)
- return -errno;
- 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)
- return -EIO;
- return size;
- }
-}
-
-struct fill_params {
- void *buf;
- fuse_fill_dir_t filler;
-};
-
-static int dentry_fuse_fill(struct dentry *dentry, void *arg)
-{
- struct fill_params *fill_params = arg;
- return fill_params->filler(fill_params->buf, dentry->file_name_utf8,
- NULL, 0);
-}
-
-/* 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 wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh;
- struct 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->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 inode *inode = wim_pathname_to_inode(ctx->wim, path);
- int ret;
- if (!inode)
- return -ENOENT;
- if (!inode_is_symlink(inode))
- return -EINVAL;
-
- ret = inode_readlink(inode, buf, buf_len, ctx->wim,
- WIMLIB_RESOURCE_FLAG_MULTITHREADED);
- if (ret > 0)
- ret = 0;
- return ret;
-}
-
-/* Close a file. */
-static int wimfs_release(const char *path, struct fuse_file_info *fi)
-{
- struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh;
- return close_wimlib_fd(fd);
-}
-
-/* Close a directory */
-static int wimfs_releasedir(const char *path, struct fuse_file_info *fi)
-{
- struct wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh;
- return close_wimlib_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 inode *inode;
- struct 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 -ENOENT;
-
- 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 dentry *src;
- struct dentry *dst;
- struct dentry *parent_of_dst;
- char *file_name_utf16 = NULL, *file_name_utf8 = NULL;
- u16 file_name_utf16_len, file_name_utf8_len;
- 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 -ENOENT;
-
- 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));
- if (ret != 0)
- return -ENOMEM;
-
- 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;
- remove_dentry(dst, w->lookup_table);
- } else {
- /* Destination does not exist */
- parent_of_dst = get_parent_dentry(w, to);
- if (!parent_of_dst)
- return -ENOENT;
-
- if (!dentry_is_directory(parent_of_dst))
- return -ENOTDIR;
- }
-
- FREE(src->file_name);
- FREE(src->file_name_utf8);
- src->file_name = file_name_utf16;
- src->file_name_utf8 = file_name_utf8;
- src->file_name_len = file_name_utf16_len;
- src->file_name_utf8_len = file_name_utf8_len;
-
- unlink_dentry(src);
- dentry_add_child(parent_of_dst, src);
- return 0;
-}
-
-/* Remove a directory */
-static int wimfs_rmdir(const char *path)
-{
- struct dentry *dentry;
- WIMStruct *w = wimfs_get_WIMStruct();
-
- dentry = get_dentry(w, path);
- if (!dentry)
- return -ENOENT;
-
- if (!dentry_is_empty_directory(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 ads_entry *existing_ads_entry;
- struct ads_entry *new_ads_entry;
- struct lookup_table_entry *existing_lte;
- struct lookup_table_entry *lte;
- struct inode *inode;
- u8 value_hash[SHA1_HASH_SIZE];
- 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 -ENOENT;
-
- existing_ads_entry = inode_get_ads_entry(inode, name, &ads_idx);
- if (existing_ads_entry) {
- if (flags & XATTR_CREATE)
- return -EEXIST;
- inode_remove_ads(inode, ads_idx, ctx->wim->lookup_table);
- } else {
- if (flags & XATTR_REPLACE)
- return -ENOATTR;
- }
- new_ads_entry = inode_add_ads(inode, name);
- if (!new_ads_entry)
- return -ENOMEM;
-
- sha1_buffer((const u8*)value, size, value_hash);
-
- existing_lte = __lookup_resource(ctx->wim->lookup_table, value_hash);
-
- if (existing_lte) {
- lte = existing_lte;
- lte->refcnt++;
- } else {
- u8 *value_copy;
- lte = new_lookup_table_entry();
- if (!lte)
- return -ENOMEM;
- value_copy = MALLOC(size);
- if (!value_copy) {
- FREE(lte);
- return -ENOMEM;
- }
- memcpy(value_copy, value, size);
- lte->resource_location = RESOURCE_IN_ATTACHED_BUFFER;
- lte->attached_buffer = value_copy;
- lte->resource_entry.original_size = size;
- lte->resource_entry.size = size;
- lte->resource_entry.flags = 0;
- copy_hash(lte->hash, value_hash);
- lookup_table_insert(ctx->wim->lookup_table, lte);
- }
- new_ads_entry->lte = lte;
- return 0;
-}
-#endif
-
-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();
-
- 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;
-}
-
-
-/* Reduce the size of a file */
-static int wimfs_truncate(const char *path, off_t size)
-{
- struct dentry *dentry;
- struct lookup_table_entry *lte;
- int ret;
- u16 stream_idx;
- u32 stream_id;
- struct 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) /* Already a zero-length file */
- 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;
- } 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,
- <e, size, ctx);
- }
- return ret;
-}
-
-/* Remove a regular file */
-static int wimfs_unlink(const char *path)
-{
- struct dentry *dentry;
- struct 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 dentry *dentry;
- struct inode *inode;
- WIMStruct *w = wimfs_get_WIMStruct();
-
- dentry = get_dentry(w, path);
- if (!dentry)
- return -ENOENT;
- inode = dentry->d_inode;
-
- if (tv[0].tv_nsec != UTIME_OMIT) {
- if (tv[0].tv_nsec == UTIME_NOW)
- inode->last_access_time = get_wim_timestamp();
- else
- inode->last_access_time = timespec_to_wim_timestamp(&tv[0]);
- }
- if (tv[1].tv_nsec != UTIME_OMIT) {
- if (tv[1].tv_nsec == UTIME_NOW)
- inode->last_write_time = get_wim_timestamp();
- else
- inode->last_write_time = timespec_to_wim_timestamp(&tv[1]);
- }
- return 0;
-}
-#else
-static int wimfs_utime(const char *path, struct utimbuf *times)
-{
- struct dentry *dentry;
- struct inode *inode;
- WIMStruct *w = wimfs_get_WIMStruct();
-
- dentry = get_dentry(w, path);
- if (!dentry)
- return -ENOENT;
- inode = dentry->d_inode;
-
- inode->last_write_time = unix_timestamp_to_wim(times->modtime);
- inode->last_access_time = unix_timestamp_to_wim(times->actime);
- return 0;
-}
-#endif
-
-/* 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 wimlib_fd *fd = (struct wimlib_fd*)(uintptr_t)fi->fh;
- int ret;
- u64 now;
-
- if (!fd)
- return -EBADF;
-
- wimlib_assert(fd->f_lte);
- wimlib_assert(fd->f_lte->staging_file_name);
- wimlib_assert(fd->staging_fd != -1);
- wimlib_assert(fd->f_inode);
-
- /* Seek to the requested position */
- if (lseek(fd->staging_fd, offset, SEEK_SET) == -1)
- return -errno;
-
- /* Write the data. */
- ret = write(fd->staging_fd, buf, size);
- if (ret == -1)
- return -errno;
-
- now = get_wim_timestamp();
- fd->f_inode->last_write_time = now;
- fd->f_inode->last_access_time = now;
- return ret;
-}
-
-static struct fuse_operations wimfs_operations = {
- .access = wimfs_access,
- .chmod = wimfs_chmod,
- .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,
-
-#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 = 0;
- char *argv[16];
- int ret;
- char *dir_copy;
- struct lookup_table *joined_tab, *wim_tab_save;
- struct image_metadata *imd;
- struct wimfs_context ctx;
-
- 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;
-
- imd = &wim->image_metadata[image - 1];
-
- DEBUG("Selected image %d", image);
-
- 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->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->fp, wim->filename);
- if (ret != 0)
- goto out;
- }
-
- 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;
-
- DEBUG("Unlinking message queues in case they already exist");
- ret = set_message_queue_names(&ctx, dir);
- if (ret != 0)
- goto out;
- unlink_message_queues(&ctx);
-
- DEBUG("Preparing arguments to fuse_main()");
-
- dir_copy = STRDUP(dir);
- if (!dir_copy)
- goto out_free_message_queue_names;
-
- 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 because we are going to assign inode
- * numbers oursides. The inodes will be given unique numbers in the
- * 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";
- 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");
- }
- 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 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);
-
- 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);
-
- DEBUG("Returned from fuse_main() (ret = %d)", ret);
- if (ret)
- ret = WIMLIB_ERR_FUSE;
-out_free_dir_copy:
- FREE(dir_copy);
-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)
-{
- pid_t pid;
- int status;
- int ret;
- char msg[2];
- struct timeval now;
- struct timespec timeout;
- long msgsize;
- struct wimfs_context ctx;
- char *mailbox;
-
- init_wimfs_context(&ctx);
-
- /* Open message queues between the unmount process and the
- * filesystem daemon. */
- ret = set_message_queue_names(&ctx, dir);
- if (ret != 0)
- goto out;
-
- ret = open_message_queues(&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;
- 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);
- 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;
-
- }
- DEBUG("Received message: Unmount %s", (mailbox[0] ? "Failed" : "Ok"));
- ret = mailbox[0];
- if (ret)
- ERROR("Unmount failed");
-out_free_mailbox:
- FREE(mailbox);
-out_close_message_queues:
- close_message_queues(&ctx);
-out_free_message_queue_names:
- free_message_queue_names(&ctx);
-out:
- return ret;
-}
-
-#else /* WITH_FUSE */
-
-
-static inline int mount_unsupported_error()
-{
- ERROR("wimlib was compiled with --without-fuse, which disables support "
- "for mounting WIMs.");
- return WIMLIB_ERR_UNSUPPORTED;
-}
-
-WIMLIBAPI int wimlib_unmount_image(const char *dir, int unmount_flags,
- wimlib_progress_func_t progress_func)
-{
- return mount_unsupported_error();
-}
-
-WIMLIBAPI int wimlib_mount_image(WIMStruct *wim_p, int image, const char *dir,
- int mount_flags, WIMStruct **additional_swms,
- unsigned num_additional_swms,
- const char *staging_dir)
-{
- return mount_unsupported_error();
-}
-
-#endif /* WITH_FUSE */
git://wimlib.net / wimlib / blobdiff